SemaChecking.cpp revision 80fb7dd8e0c56632dc68f5864f70abb2fde0e1df
159907c4d8f6fc8aacfdaa0273bd7a9c140fbb45fChris Lattner//===--- SemaChecking.cpp - Extra Semantic Checking -----------------------===// 259907c4d8f6fc8aacfdaa0273bd7a9c140fbb45fChris Lattner// 359907c4d8f6fc8aacfdaa0273bd7a9c140fbb45fChris Lattner// The LLVM Compiler Infrastructure 459907c4d8f6fc8aacfdaa0273bd7a9c140fbb45fChris Lattner// 50bc735ffcfb223c0186419547abaa5c84482663eChris Lattner// This file is distributed under the University of Illinois Open Source 60bc735ffcfb223c0186419547abaa5c84482663eChris Lattner// License. See LICENSE.TXT for details. 759907c4d8f6fc8aacfdaa0273bd7a9c140fbb45fChris Lattner// 859907c4d8f6fc8aacfdaa0273bd7a9c140fbb45fChris Lattner//===----------------------------------------------------------------------===// 959907c4d8f6fc8aacfdaa0273bd7a9c140fbb45fChris Lattner// 101eb4433ac451dc16f4133a88af2d002ac26c58efMike Stump// This file implements extra semantic analysis beyond what is enforced 1159907c4d8f6fc8aacfdaa0273bd7a9c140fbb45fChris Lattner// by the C type system. 1259907c4d8f6fc8aacfdaa0273bd7a9c140fbb45fChris Lattner// 1359907c4d8f6fc8aacfdaa0273bd7a9c140fbb45fChris Lattner//===----------------------------------------------------------------------===// 1459907c4d8f6fc8aacfdaa0273bd7a9c140fbb45fChris Lattner 155f8d604246976a93a73549b07bbc8ee0b2061b50John McCall#include "clang/Sema/Initialization.h" 16e737f5041a36d0befb39ffeed8d50ba15916d3daDouglas Gregor#include "clang/Sema/Sema.h" 172d88708cbe4e4ec5e04e4acb6bd7f5be68557379John McCall#include "clang/Sema/SemaInternal.h" 18276b061970939293f1abaf694bd3ef05b2cbda79Eli Friedman#include "clang/Sema/Initialization.h" 19781472fe99a120098c631b0cbe33c89f8cef5e70John McCall#include "clang/Sema/ScopeInfo.h" 20826a3457f737f1fc45a22954fd1bfde38160c165Ted Kremenek#include "clang/Analysis/Analyses/FormatString.h" 2159907c4d8f6fc8aacfdaa0273bd7a9c140fbb45fChris Lattner#include "clang/AST/ASTContext.h" 22199c3d6cd16aebbb9c7f0d42af9d922c9628bf70Ken Dyck#include "clang/AST/CharUnits.h" 23384aff8b94bb0d1ad6c5667b90621e5699815bb2John McCall#include "clang/AST/DeclCXX.h" 24c4a1dea2dc56bd1357ec91b829a0b9e68229a13eDaniel Dunbar#include "clang/AST/DeclObjC.h" 252324512285caac0332bbbc6e4cab6245d2a370a1Ted Kremenek#include "clang/AST/ExprCXX.h" 267ff22b259d4d4729f701679e3a7f0e242365e07fTed Kremenek#include "clang/AST/ExprObjC.h" 27f85e193739c953358c865005855253af4f68a497John McCall#include "clang/AST/EvaluatedExprVisitor.h" 28f8c4921c73d73123e2b79221ad4f1775ce984cfdMike Stump#include "clang/AST/DeclObjC.h" 29f8c4921c73d73123e2b79221ad4f1775ce984cfdMike Stump#include "clang/AST/StmtCXX.h" 30f8c4921c73d73123e2b79221ad4f1775ce984cfdMike Stump#include "clang/AST/StmtObjC.h" 3159907c4d8f6fc8aacfdaa0273bd7a9c140fbb45fChris Lattner#include "clang/Lex/Preprocessor.h" 32f8c4921c73d73123e2b79221ad4f1775ce984cfdMike Stump#include "llvm/ADT/BitVector.h" 33f8c4921c73d73123e2b79221ad4f1775ce984cfdMike Stump#include "llvm/ADT/STLExtras.h" 343bfc5f49e0e37e235bb0d33bcbcb36af9d1f84abTom Care#include "llvm/Support/raw_ostream.h" 35691ebc3f3225542e5abd85e107ebdbec907cf510Eric Christopher#include "clang/Basic/TargetBuiltins.h" 3626a31428f130b66f61834d1b4d1cf72f590f70b9Nate Begeman#include "clang/Basic/TargetInfo.h" 377da71020b97c69b95831bd03d35e8e8404bfdea0Fariborz Jahanian#include "clang/Basic/ConvertUTF.h" 38a1f3dba77b7418575c1ff539ffa74ebaa068280cZhongxing Xu#include <limits> 3959907c4d8f6fc8aacfdaa0273bd7a9c140fbb45fChris Lattnerusing namespace clang; 40781472fe99a120098c631b0cbe33c89f8cef5e70John McCallusing namespace sema; 4159907c4d8f6fc8aacfdaa0273bd7a9c140fbb45fChris Lattner 4260800081361b0ffc114877b8abbc81cb57b4edf6Chris LattnerSourceLocation Sema::getLocationOfStringLiteralByte(const StringLiteral *SL, 4360800081361b0ffc114877b8abbc81cb57b4edf6Chris Lattner unsigned ByteNo) const { 4408f92e3a5dead1f1ee656678a7f06e43279d6e50Chris Lattner return SL->getLocationOfByte(ByteNo, PP.getSourceManager(), 4508f92e3a5dead1f1ee656678a7f06e43279d6e50Chris Lattner PP.getLangOptions(), PP.getTargetInfo()); 4660800081361b0ffc114877b8abbc81cb57b4edf6Chris Lattner} 4708f92e3a5dead1f1ee656678a7f06e43279d6e50Chris Lattner 4860800081361b0ffc114877b8abbc81cb57b4edf6Chris Lattner 494403a5e1f956fa86d515492dbe7c7a2817d8780dRyan Flynn/// CheckablePrintfAttr - does a function call have a "printf" attribute 504403a5e1f956fa86d515492dbe7c7a2817d8780dRyan Flynn/// and arguments that merit checking? 514403a5e1f956fa86d515492dbe7c7a2817d8780dRyan Flynnbool Sema::CheckablePrintfAttr(const FormatAttr *Format, CallExpr *TheCall) { 524403a5e1f956fa86d515492dbe7c7a2817d8780dRyan Flynn if (Format->getType() == "printf") return true; 534403a5e1f956fa86d515492dbe7c7a2817d8780dRyan Flynn if (Format->getType() == "printf0") { 544403a5e1f956fa86d515492dbe7c7a2817d8780dRyan Flynn // printf0 allows null "format" string; if so don't check format/args 554403a5e1f956fa86d515492dbe7c7a2817d8780dRyan Flynn unsigned format_idx = Format->getFormatIdx() - 1; 564a2614e94672c47395abcde60518776fbebec589Sebastian Redl // Does the index refer to the implicit object argument? 574a2614e94672c47395abcde60518776fbebec589Sebastian Redl if (isa<CXXMemberCallExpr>(TheCall)) { 584a2614e94672c47395abcde60518776fbebec589Sebastian Redl if (format_idx == 0) 594a2614e94672c47395abcde60518776fbebec589Sebastian Redl return false; 604a2614e94672c47395abcde60518776fbebec589Sebastian Redl --format_idx; 614a2614e94672c47395abcde60518776fbebec589Sebastian Redl } 624403a5e1f956fa86d515492dbe7c7a2817d8780dRyan Flynn if (format_idx < TheCall->getNumArgs()) { 634403a5e1f956fa86d515492dbe7c7a2817d8780dRyan Flynn Expr *Format = TheCall->getArg(format_idx)->IgnoreParenCasts(); 64efaff195ba1fa55b6fe0b0b2435b81451387d241Ted Kremenek if (!Format->isNullPointerConstant(Context, 65efaff195ba1fa55b6fe0b0b2435b81451387d241Ted Kremenek Expr::NPC_ValueDependentIsNull)) 664403a5e1f956fa86d515492dbe7c7a2817d8780dRyan Flynn return true; 674403a5e1f956fa86d515492dbe7c7a2817d8780dRyan Flynn } 684403a5e1f956fa86d515492dbe7c7a2817d8780dRyan Flynn } 694403a5e1f956fa86d515492dbe7c7a2817d8780dRyan Flynn return false; 704403a5e1f956fa86d515492dbe7c7a2817d8780dRyan Flynn} 7160800081361b0ffc114877b8abbc81cb57b4edf6Chris Lattner 728e10f3b9cc1db43645bbc2999eb163af8997d468John McCall/// Checks that a call expression's argument count is the desired number. 738e10f3b9cc1db43645bbc2999eb163af8997d468John McCall/// This is useful when doing custom type-checking. Returns true on error. 748e10f3b9cc1db43645bbc2999eb163af8997d468John McCallstatic bool checkArgCount(Sema &S, CallExpr *call, unsigned desiredArgCount) { 758e10f3b9cc1db43645bbc2999eb163af8997d468John McCall unsigned argCount = call->getNumArgs(); 768e10f3b9cc1db43645bbc2999eb163af8997d468John McCall if (argCount == desiredArgCount) return false; 778e10f3b9cc1db43645bbc2999eb163af8997d468John McCall 788e10f3b9cc1db43645bbc2999eb163af8997d468John McCall if (argCount < desiredArgCount) 798e10f3b9cc1db43645bbc2999eb163af8997d468John McCall return S.Diag(call->getLocEnd(), diag::err_typecheck_call_too_few_args) 808e10f3b9cc1db43645bbc2999eb163af8997d468John McCall << 0 /*function call*/ << desiredArgCount << argCount 818e10f3b9cc1db43645bbc2999eb163af8997d468John McCall << call->getSourceRange(); 828e10f3b9cc1db43645bbc2999eb163af8997d468John McCall 838e10f3b9cc1db43645bbc2999eb163af8997d468John McCall // Highlight all the excess arguments. 848e10f3b9cc1db43645bbc2999eb163af8997d468John McCall SourceRange range(call->getArg(desiredArgCount)->getLocStart(), 858e10f3b9cc1db43645bbc2999eb163af8997d468John McCall call->getArg(argCount - 1)->getLocEnd()); 868e10f3b9cc1db43645bbc2999eb163af8997d468John McCall 878e10f3b9cc1db43645bbc2999eb163af8997d468John McCall return S.Diag(range.getBegin(), diag::err_typecheck_call_too_many_args) 888e10f3b9cc1db43645bbc2999eb163af8997d468John McCall << 0 /*function call*/ << desiredArgCount << argCount 898e10f3b9cc1db43645bbc2999eb163af8997d468John McCall << call->getArg(1)->getSourceRange(); 908e10f3b9cc1db43645bbc2999eb163af8997d468John McCall} 918e10f3b9cc1db43645bbc2999eb163af8997d468John McCall 9277f68bb90af93b95045fb994e7cd68137adcc132Julien Lerouge/// CheckBuiltinAnnotationString - Checks that string argument to the builtin 9377f68bb90af93b95045fb994e7cd68137adcc132Julien Lerouge/// annotation is a non wide string literal. 9477f68bb90af93b95045fb994e7cd68137adcc132Julien Lerougestatic bool CheckBuiltinAnnotationString(Sema &S, Expr *Arg) { 9577f68bb90af93b95045fb994e7cd68137adcc132Julien Lerouge Arg = Arg->IgnoreParenCasts(); 9677f68bb90af93b95045fb994e7cd68137adcc132Julien Lerouge StringLiteral *Literal = dyn_cast<StringLiteral>(Arg); 9777f68bb90af93b95045fb994e7cd68137adcc132Julien Lerouge if (!Literal || !Literal->isAscii()) { 9877f68bb90af93b95045fb994e7cd68137adcc132Julien Lerouge S.Diag(Arg->getLocStart(), diag::err_builtin_annotation_not_string_constant) 9977f68bb90af93b95045fb994e7cd68137adcc132Julien Lerouge << Arg->getSourceRange(); 10077f68bb90af93b95045fb994e7cd68137adcc132Julien Lerouge return true; 10177f68bb90af93b95045fb994e7cd68137adcc132Julien Lerouge } 10277f68bb90af93b95045fb994e7cd68137adcc132Julien Lerouge return false; 10377f68bb90af93b95045fb994e7cd68137adcc132Julien Lerouge} 10477f68bb90af93b95045fb994e7cd68137adcc132Julien Lerouge 10560d7b3a319d84d688752be3870615ac0f111fb16John McCallExprResult 106d406bf0e8c17012110a8476d03c6f9a97b56ecf7Anders CarlssonSema::CheckBuiltinFunctionCall(unsigned BuiltinID, CallExpr *TheCall) { 10760d7b3a319d84d688752be3870615ac0f111fb16John McCall ExprResult TheCallResult(Owned(TheCall)); 1082def48394f6d48bde0dec2b514193c2b533265b5Douglas Gregor 109946928f48c96bddf3cfa126862f5ab69c2d904a0Chris Lattner // Find out if any arguments are required to be integer constant expressions. 110946928f48c96bddf3cfa126862f5ab69c2d904a0Chris Lattner unsigned ICEArguments = 0; 111946928f48c96bddf3cfa126862f5ab69c2d904a0Chris Lattner ASTContext::GetBuiltinTypeError Error; 112946928f48c96bddf3cfa126862f5ab69c2d904a0Chris Lattner Context.GetBuiltinType(BuiltinID, Error, &ICEArguments); 113946928f48c96bddf3cfa126862f5ab69c2d904a0Chris Lattner if (Error != ASTContext::GE_None) 114946928f48c96bddf3cfa126862f5ab69c2d904a0Chris Lattner ICEArguments = 0; // Don't diagnose previously diagnosed errors. 115946928f48c96bddf3cfa126862f5ab69c2d904a0Chris Lattner 116946928f48c96bddf3cfa126862f5ab69c2d904a0Chris Lattner // If any arguments are required to be ICE's, check and diagnose. 117946928f48c96bddf3cfa126862f5ab69c2d904a0Chris Lattner for (unsigned ArgNo = 0; ICEArguments != 0; ++ArgNo) { 118946928f48c96bddf3cfa126862f5ab69c2d904a0Chris Lattner // Skip arguments not required to be ICE's. 119946928f48c96bddf3cfa126862f5ab69c2d904a0Chris Lattner if ((ICEArguments & (1 << ArgNo)) == 0) continue; 120946928f48c96bddf3cfa126862f5ab69c2d904a0Chris Lattner 121946928f48c96bddf3cfa126862f5ab69c2d904a0Chris Lattner llvm::APSInt Result; 122946928f48c96bddf3cfa126862f5ab69c2d904a0Chris Lattner if (SemaBuiltinConstantArg(TheCall, ArgNo, Result)) 123946928f48c96bddf3cfa126862f5ab69c2d904a0Chris Lattner return true; 124946928f48c96bddf3cfa126862f5ab69c2d904a0Chris Lattner ICEArguments &= ~(1 << ArgNo); 125946928f48c96bddf3cfa126862f5ab69c2d904a0Chris Lattner } 126946928f48c96bddf3cfa126862f5ab69c2d904a0Chris Lattner 127d406bf0e8c17012110a8476d03c6f9a97b56ecf7Anders Carlsson switch (BuiltinID) { 12830ce344307f8a8b00054021307015571f83c7364Chris Lattner case Builtin::BI__builtin___CFStringMakeConstantString: 129925e60d3fa706f31886027c876989af79eb0e0d2Chris Lattner assert(TheCall->getNumArgs() == 1 && 1301b9a0793955070738cac6f04b5abe9496be9b317Chris Lattner "Wrong # arguments to builtin CFStringMakeConstantString"); 131690398188ea5b428f06aa13c7d4ce6eb741ad4f9Chris Lattner if (CheckObjCString(TheCall->getArg(0))) 1320eb23307222bda7ad95d968eac4e1ab30864b213Sebastian Redl return ExprError(); 133d406bf0e8c17012110a8476d03c6f9a97b56ecf7Anders Carlsson break; 13449ff7a1c8c67d56e62d3b4627463b705c0d5008cTed Kremenek case Builtin::BI__builtin_stdarg_start: 13530ce344307f8a8b00054021307015571f83c7364Chris Lattner case Builtin::BI__builtin_va_start: 1360eb23307222bda7ad95d968eac4e1ab30864b213Sebastian Redl if (SemaBuiltinVAStart(TheCall)) 1370eb23307222bda7ad95d968eac4e1ab30864b213Sebastian Redl return ExprError(); 138d406bf0e8c17012110a8476d03c6f9a97b56ecf7Anders Carlsson break; 1391b9a0793955070738cac6f04b5abe9496be9b317Chris Lattner case Builtin::BI__builtin_isgreater: 1401b9a0793955070738cac6f04b5abe9496be9b317Chris Lattner case Builtin::BI__builtin_isgreaterequal: 1411b9a0793955070738cac6f04b5abe9496be9b317Chris Lattner case Builtin::BI__builtin_isless: 1421b9a0793955070738cac6f04b5abe9496be9b317Chris Lattner case Builtin::BI__builtin_islessequal: 1431b9a0793955070738cac6f04b5abe9496be9b317Chris Lattner case Builtin::BI__builtin_islessgreater: 1441b9a0793955070738cac6f04b5abe9496be9b317Chris Lattner case Builtin::BI__builtin_isunordered: 1450eb23307222bda7ad95d968eac4e1ab30864b213Sebastian Redl if (SemaBuiltinUnorderedCompare(TheCall)) 1460eb23307222bda7ad95d968eac4e1ab30864b213Sebastian Redl return ExprError(); 147d406bf0e8c17012110a8476d03c6f9a97b56ecf7Anders Carlsson break; 148e771a7ac11fb27f0e734e5de4d858f2c268895e5Benjamin Kramer case Builtin::BI__builtin_fpclassify: 149e771a7ac11fb27f0e734e5de4d858f2c268895e5Benjamin Kramer if (SemaBuiltinFPClassification(TheCall, 6)) 150e771a7ac11fb27f0e734e5de4d858f2c268895e5Benjamin Kramer return ExprError(); 151e771a7ac11fb27f0e734e5de4d858f2c268895e5Benjamin Kramer break; 1529ac6f62a77be5b281a7ddc24a16669b457ac47c2Eli Friedman case Builtin::BI__builtin_isfinite: 1539ac6f62a77be5b281a7ddc24a16669b457ac47c2Eli Friedman case Builtin::BI__builtin_isinf: 1549ac6f62a77be5b281a7ddc24a16669b457ac47c2Eli Friedman case Builtin::BI__builtin_isinf_sign: 1559ac6f62a77be5b281a7ddc24a16669b457ac47c2Eli Friedman case Builtin::BI__builtin_isnan: 1569ac6f62a77be5b281a7ddc24a16669b457ac47c2Eli Friedman case Builtin::BI__builtin_isnormal: 1573b1e26b708e8d00d4ba10ff857201bae2aff6baeBenjamin Kramer if (SemaBuiltinFPClassification(TheCall, 1)) 1589ac6f62a77be5b281a7ddc24a16669b457ac47c2Eli Friedman return ExprError(); 1599ac6f62a77be5b281a7ddc24a16669b457ac47c2Eli Friedman break; 160d38617c8a50f9729c254ab76cd359af797c6739bEli Friedman case Builtin::BI__builtin_shufflevector: 1610eb23307222bda7ad95d968eac4e1ab30864b213Sebastian Redl return SemaBuiltinShuffleVector(TheCall); 1620eb23307222bda7ad95d968eac4e1ab30864b213Sebastian Redl // TheCall will be freed by the smart pointer here, but that's fine, since 1630eb23307222bda7ad95d968eac4e1ab30864b213Sebastian Redl // SemaBuiltinShuffleVector guts it, but then doesn't release it. 1644493f79fce48cd9cbd9f55fa9d452cde736747a0Daniel Dunbar case Builtin::BI__builtin_prefetch: 1650eb23307222bda7ad95d968eac4e1ab30864b213Sebastian Redl if (SemaBuiltinPrefetch(TheCall)) 1660eb23307222bda7ad95d968eac4e1ab30864b213Sebastian Redl return ExprError(); 167d406bf0e8c17012110a8476d03c6f9a97b56ecf7Anders Carlsson break; 168d5f8a4fd4d6dfb0415b93bb7ab721bba5cab1332Daniel Dunbar case Builtin::BI__builtin_object_size: 1690eb23307222bda7ad95d968eac4e1ab30864b213Sebastian Redl if (SemaBuiltinObjectSize(TheCall)) 1700eb23307222bda7ad95d968eac4e1ab30864b213Sebastian Redl return ExprError(); 171d406bf0e8c17012110a8476d03c6f9a97b56ecf7Anders Carlsson break; 172d875fed28578835de89cd407e9db4be788596d7cEli Friedman case Builtin::BI__builtin_longjmp: 173d875fed28578835de89cd407e9db4be788596d7cEli Friedman if (SemaBuiltinLongjmp(TheCall)) 174d875fed28578835de89cd407e9db4be788596d7cEli Friedman return ExprError(); 175d406bf0e8c17012110a8476d03c6f9a97b56ecf7Anders Carlsson break; 1768e10f3b9cc1db43645bbc2999eb163af8997d468John McCall 1778e10f3b9cc1db43645bbc2999eb163af8997d468John McCall case Builtin::BI__builtin_classify_type: 1788e10f3b9cc1db43645bbc2999eb163af8997d468John McCall if (checkArgCount(*this, TheCall, 1)) return true; 1798e10f3b9cc1db43645bbc2999eb163af8997d468John McCall TheCall->setType(Context.IntTy); 1808e10f3b9cc1db43645bbc2999eb163af8997d468John McCall break; 18175c29a012793292ff4578015a9113bf086156d7fChris Lattner case Builtin::BI__builtin_constant_p: 1828e10f3b9cc1db43645bbc2999eb163af8997d468John McCall if (checkArgCount(*this, TheCall, 1)) return true; 1838e10f3b9cc1db43645bbc2999eb163af8997d468John McCall TheCall->setType(Context.IntTy); 18475c29a012793292ff4578015a9113bf086156d7fChris Lattner break; 1855caa370ea6f70bd3e7e4a9cc3b69ac1a849c8534Chris Lattner case Builtin::BI__sync_fetch_and_add: 186a9766411aaaa1446a5da96dc5042de8da05d89bdDouglas Gregor case Builtin::BI__sync_fetch_and_add_1: 187a9766411aaaa1446a5da96dc5042de8da05d89bdDouglas Gregor case Builtin::BI__sync_fetch_and_add_2: 188a9766411aaaa1446a5da96dc5042de8da05d89bdDouglas Gregor case Builtin::BI__sync_fetch_and_add_4: 189a9766411aaaa1446a5da96dc5042de8da05d89bdDouglas Gregor case Builtin::BI__sync_fetch_and_add_8: 190a9766411aaaa1446a5da96dc5042de8da05d89bdDouglas Gregor case Builtin::BI__sync_fetch_and_add_16: 1915caa370ea6f70bd3e7e4a9cc3b69ac1a849c8534Chris Lattner case Builtin::BI__sync_fetch_and_sub: 192a9766411aaaa1446a5da96dc5042de8da05d89bdDouglas Gregor case Builtin::BI__sync_fetch_and_sub_1: 193a9766411aaaa1446a5da96dc5042de8da05d89bdDouglas Gregor case Builtin::BI__sync_fetch_and_sub_2: 194a9766411aaaa1446a5da96dc5042de8da05d89bdDouglas Gregor case Builtin::BI__sync_fetch_and_sub_4: 195a9766411aaaa1446a5da96dc5042de8da05d89bdDouglas Gregor case Builtin::BI__sync_fetch_and_sub_8: 196a9766411aaaa1446a5da96dc5042de8da05d89bdDouglas Gregor case Builtin::BI__sync_fetch_and_sub_16: 1975caa370ea6f70bd3e7e4a9cc3b69ac1a849c8534Chris Lattner case Builtin::BI__sync_fetch_and_or: 198a9766411aaaa1446a5da96dc5042de8da05d89bdDouglas Gregor case Builtin::BI__sync_fetch_and_or_1: 199a9766411aaaa1446a5da96dc5042de8da05d89bdDouglas Gregor case Builtin::BI__sync_fetch_and_or_2: 200a9766411aaaa1446a5da96dc5042de8da05d89bdDouglas Gregor case Builtin::BI__sync_fetch_and_or_4: 201a9766411aaaa1446a5da96dc5042de8da05d89bdDouglas Gregor case Builtin::BI__sync_fetch_and_or_8: 202a9766411aaaa1446a5da96dc5042de8da05d89bdDouglas Gregor case Builtin::BI__sync_fetch_and_or_16: 2035caa370ea6f70bd3e7e4a9cc3b69ac1a849c8534Chris Lattner case Builtin::BI__sync_fetch_and_and: 204a9766411aaaa1446a5da96dc5042de8da05d89bdDouglas Gregor case Builtin::BI__sync_fetch_and_and_1: 205a9766411aaaa1446a5da96dc5042de8da05d89bdDouglas Gregor case Builtin::BI__sync_fetch_and_and_2: 206a9766411aaaa1446a5da96dc5042de8da05d89bdDouglas Gregor case Builtin::BI__sync_fetch_and_and_4: 207a9766411aaaa1446a5da96dc5042de8da05d89bdDouglas Gregor case Builtin::BI__sync_fetch_and_and_8: 208a9766411aaaa1446a5da96dc5042de8da05d89bdDouglas Gregor case Builtin::BI__sync_fetch_and_and_16: 2095caa370ea6f70bd3e7e4a9cc3b69ac1a849c8534Chris Lattner case Builtin::BI__sync_fetch_and_xor: 210a9766411aaaa1446a5da96dc5042de8da05d89bdDouglas Gregor case Builtin::BI__sync_fetch_and_xor_1: 211a9766411aaaa1446a5da96dc5042de8da05d89bdDouglas Gregor case Builtin::BI__sync_fetch_and_xor_2: 212a9766411aaaa1446a5da96dc5042de8da05d89bdDouglas Gregor case Builtin::BI__sync_fetch_and_xor_4: 213a9766411aaaa1446a5da96dc5042de8da05d89bdDouglas Gregor case Builtin::BI__sync_fetch_and_xor_8: 214a9766411aaaa1446a5da96dc5042de8da05d89bdDouglas Gregor case Builtin::BI__sync_fetch_and_xor_16: 2155caa370ea6f70bd3e7e4a9cc3b69ac1a849c8534Chris Lattner case Builtin::BI__sync_add_and_fetch: 216a9766411aaaa1446a5da96dc5042de8da05d89bdDouglas Gregor case Builtin::BI__sync_add_and_fetch_1: 217a9766411aaaa1446a5da96dc5042de8da05d89bdDouglas Gregor case Builtin::BI__sync_add_and_fetch_2: 218a9766411aaaa1446a5da96dc5042de8da05d89bdDouglas Gregor case Builtin::BI__sync_add_and_fetch_4: 219a9766411aaaa1446a5da96dc5042de8da05d89bdDouglas Gregor case Builtin::BI__sync_add_and_fetch_8: 220a9766411aaaa1446a5da96dc5042de8da05d89bdDouglas Gregor case Builtin::BI__sync_add_and_fetch_16: 2215caa370ea6f70bd3e7e4a9cc3b69ac1a849c8534Chris Lattner case Builtin::BI__sync_sub_and_fetch: 222a9766411aaaa1446a5da96dc5042de8da05d89bdDouglas Gregor case Builtin::BI__sync_sub_and_fetch_1: 223a9766411aaaa1446a5da96dc5042de8da05d89bdDouglas Gregor case Builtin::BI__sync_sub_and_fetch_2: 224a9766411aaaa1446a5da96dc5042de8da05d89bdDouglas Gregor case Builtin::BI__sync_sub_and_fetch_4: 225a9766411aaaa1446a5da96dc5042de8da05d89bdDouglas Gregor case Builtin::BI__sync_sub_and_fetch_8: 226a9766411aaaa1446a5da96dc5042de8da05d89bdDouglas Gregor case Builtin::BI__sync_sub_and_fetch_16: 2275caa370ea6f70bd3e7e4a9cc3b69ac1a849c8534Chris Lattner case Builtin::BI__sync_and_and_fetch: 228a9766411aaaa1446a5da96dc5042de8da05d89bdDouglas Gregor case Builtin::BI__sync_and_and_fetch_1: 229a9766411aaaa1446a5da96dc5042de8da05d89bdDouglas Gregor case Builtin::BI__sync_and_and_fetch_2: 230a9766411aaaa1446a5da96dc5042de8da05d89bdDouglas Gregor case Builtin::BI__sync_and_and_fetch_4: 231a9766411aaaa1446a5da96dc5042de8da05d89bdDouglas Gregor case Builtin::BI__sync_and_and_fetch_8: 232a9766411aaaa1446a5da96dc5042de8da05d89bdDouglas Gregor case Builtin::BI__sync_and_and_fetch_16: 2335caa370ea6f70bd3e7e4a9cc3b69ac1a849c8534Chris Lattner case Builtin::BI__sync_or_and_fetch: 234a9766411aaaa1446a5da96dc5042de8da05d89bdDouglas Gregor case Builtin::BI__sync_or_and_fetch_1: 235a9766411aaaa1446a5da96dc5042de8da05d89bdDouglas Gregor case Builtin::BI__sync_or_and_fetch_2: 236a9766411aaaa1446a5da96dc5042de8da05d89bdDouglas Gregor case Builtin::BI__sync_or_and_fetch_4: 237a9766411aaaa1446a5da96dc5042de8da05d89bdDouglas Gregor case Builtin::BI__sync_or_and_fetch_8: 238a9766411aaaa1446a5da96dc5042de8da05d89bdDouglas Gregor case Builtin::BI__sync_or_and_fetch_16: 2395caa370ea6f70bd3e7e4a9cc3b69ac1a849c8534Chris Lattner case Builtin::BI__sync_xor_and_fetch: 240a9766411aaaa1446a5da96dc5042de8da05d89bdDouglas Gregor case Builtin::BI__sync_xor_and_fetch_1: 241a9766411aaaa1446a5da96dc5042de8da05d89bdDouglas Gregor case Builtin::BI__sync_xor_and_fetch_2: 242a9766411aaaa1446a5da96dc5042de8da05d89bdDouglas Gregor case Builtin::BI__sync_xor_and_fetch_4: 243a9766411aaaa1446a5da96dc5042de8da05d89bdDouglas Gregor case Builtin::BI__sync_xor_and_fetch_8: 244a9766411aaaa1446a5da96dc5042de8da05d89bdDouglas Gregor case Builtin::BI__sync_xor_and_fetch_16: 2455caa370ea6f70bd3e7e4a9cc3b69ac1a849c8534Chris Lattner case Builtin::BI__sync_val_compare_and_swap: 246a9766411aaaa1446a5da96dc5042de8da05d89bdDouglas Gregor case Builtin::BI__sync_val_compare_and_swap_1: 247a9766411aaaa1446a5da96dc5042de8da05d89bdDouglas Gregor case Builtin::BI__sync_val_compare_and_swap_2: 248a9766411aaaa1446a5da96dc5042de8da05d89bdDouglas Gregor case Builtin::BI__sync_val_compare_and_swap_4: 249a9766411aaaa1446a5da96dc5042de8da05d89bdDouglas Gregor case Builtin::BI__sync_val_compare_and_swap_8: 250a9766411aaaa1446a5da96dc5042de8da05d89bdDouglas Gregor case Builtin::BI__sync_val_compare_and_swap_16: 2515caa370ea6f70bd3e7e4a9cc3b69ac1a849c8534Chris Lattner case Builtin::BI__sync_bool_compare_and_swap: 252a9766411aaaa1446a5da96dc5042de8da05d89bdDouglas Gregor case Builtin::BI__sync_bool_compare_and_swap_1: 253a9766411aaaa1446a5da96dc5042de8da05d89bdDouglas Gregor case Builtin::BI__sync_bool_compare_and_swap_2: 254a9766411aaaa1446a5da96dc5042de8da05d89bdDouglas Gregor case Builtin::BI__sync_bool_compare_and_swap_4: 255a9766411aaaa1446a5da96dc5042de8da05d89bdDouglas Gregor case Builtin::BI__sync_bool_compare_and_swap_8: 256a9766411aaaa1446a5da96dc5042de8da05d89bdDouglas Gregor case Builtin::BI__sync_bool_compare_and_swap_16: 2575caa370ea6f70bd3e7e4a9cc3b69ac1a849c8534Chris Lattner case Builtin::BI__sync_lock_test_and_set: 258a9766411aaaa1446a5da96dc5042de8da05d89bdDouglas Gregor case Builtin::BI__sync_lock_test_and_set_1: 259a9766411aaaa1446a5da96dc5042de8da05d89bdDouglas Gregor case Builtin::BI__sync_lock_test_and_set_2: 260a9766411aaaa1446a5da96dc5042de8da05d89bdDouglas Gregor case Builtin::BI__sync_lock_test_and_set_4: 261a9766411aaaa1446a5da96dc5042de8da05d89bdDouglas Gregor case Builtin::BI__sync_lock_test_and_set_8: 262a9766411aaaa1446a5da96dc5042de8da05d89bdDouglas Gregor case Builtin::BI__sync_lock_test_and_set_16: 2635caa370ea6f70bd3e7e4a9cc3b69ac1a849c8534Chris Lattner case Builtin::BI__sync_lock_release: 264a9766411aaaa1446a5da96dc5042de8da05d89bdDouglas Gregor case Builtin::BI__sync_lock_release_1: 265a9766411aaaa1446a5da96dc5042de8da05d89bdDouglas Gregor case Builtin::BI__sync_lock_release_2: 266a9766411aaaa1446a5da96dc5042de8da05d89bdDouglas Gregor case Builtin::BI__sync_lock_release_4: 267a9766411aaaa1446a5da96dc5042de8da05d89bdDouglas Gregor case Builtin::BI__sync_lock_release_8: 268a9766411aaaa1446a5da96dc5042de8da05d89bdDouglas Gregor case Builtin::BI__sync_lock_release_16: 26923aa9c8ca0bc441aab2a38a4c9fc7a1c9e9ac16aChris Lattner case Builtin::BI__sync_swap: 270a9766411aaaa1446a5da96dc5042de8da05d89bdDouglas Gregor case Builtin::BI__sync_swap_1: 271a9766411aaaa1446a5da96dc5042de8da05d89bdDouglas Gregor case Builtin::BI__sync_swap_2: 272a9766411aaaa1446a5da96dc5042de8da05d89bdDouglas Gregor case Builtin::BI__sync_swap_4: 273a9766411aaaa1446a5da96dc5042de8da05d89bdDouglas Gregor case Builtin::BI__sync_swap_8: 274a9766411aaaa1446a5da96dc5042de8da05d89bdDouglas Gregor case Builtin::BI__sync_swap_16: 275d201457cc781f1b13d0f4b1268ff934e6004cbffChandler Carruth return SemaBuiltinAtomicOverloaded(move(TheCallResult)); 276276b061970939293f1abaf694bd3ef05b2cbda79Eli Friedman case Builtin::BI__atomic_load: 277276b061970939293f1abaf694bd3ef05b2cbda79Eli Friedman return SemaAtomicOpsOverloaded(move(TheCallResult), AtomicExpr::Load); 278276b061970939293f1abaf694bd3ef05b2cbda79Eli Friedman case Builtin::BI__atomic_store: 279276b061970939293f1abaf694bd3ef05b2cbda79Eli Friedman return SemaAtomicOpsOverloaded(move(TheCallResult), AtomicExpr::Store); 280276b061970939293f1abaf694bd3ef05b2cbda79Eli Friedman case Builtin::BI__atomic_exchange: 281276b061970939293f1abaf694bd3ef05b2cbda79Eli Friedman return SemaAtomicOpsOverloaded(move(TheCallResult), AtomicExpr::Xchg); 282276b061970939293f1abaf694bd3ef05b2cbda79Eli Friedman case Builtin::BI__atomic_compare_exchange_strong: 283276b061970939293f1abaf694bd3ef05b2cbda79Eli Friedman return SemaAtomicOpsOverloaded(move(TheCallResult), 284276b061970939293f1abaf694bd3ef05b2cbda79Eli Friedman AtomicExpr::CmpXchgStrong); 285276b061970939293f1abaf694bd3ef05b2cbda79Eli Friedman case Builtin::BI__atomic_compare_exchange_weak: 286276b061970939293f1abaf694bd3ef05b2cbda79Eli Friedman return SemaAtomicOpsOverloaded(move(TheCallResult), 287276b061970939293f1abaf694bd3ef05b2cbda79Eli Friedman AtomicExpr::CmpXchgWeak); 288276b061970939293f1abaf694bd3ef05b2cbda79Eli Friedman case Builtin::BI__atomic_fetch_add: 289276b061970939293f1abaf694bd3ef05b2cbda79Eli Friedman return SemaAtomicOpsOverloaded(move(TheCallResult), AtomicExpr::Add); 290276b061970939293f1abaf694bd3ef05b2cbda79Eli Friedman case Builtin::BI__atomic_fetch_sub: 291276b061970939293f1abaf694bd3ef05b2cbda79Eli Friedman return SemaAtomicOpsOverloaded(move(TheCallResult), AtomicExpr::Sub); 292276b061970939293f1abaf694bd3ef05b2cbda79Eli Friedman case Builtin::BI__atomic_fetch_and: 293276b061970939293f1abaf694bd3ef05b2cbda79Eli Friedman return SemaAtomicOpsOverloaded(move(TheCallResult), AtomicExpr::And); 294276b061970939293f1abaf694bd3ef05b2cbda79Eli Friedman case Builtin::BI__atomic_fetch_or: 295276b061970939293f1abaf694bd3ef05b2cbda79Eli Friedman return SemaAtomicOpsOverloaded(move(TheCallResult), AtomicExpr::Or); 296276b061970939293f1abaf694bd3ef05b2cbda79Eli Friedman case Builtin::BI__atomic_fetch_xor: 297276b061970939293f1abaf694bd3ef05b2cbda79Eli Friedman return SemaAtomicOpsOverloaded(move(TheCallResult), AtomicExpr::Xor); 29877f68bb90af93b95045fb994e7cd68137adcc132Julien Lerouge case Builtin::BI__builtin_annotation: 29977f68bb90af93b95045fb994e7cd68137adcc132Julien Lerouge if (CheckBuiltinAnnotationString(*this, TheCall->getArg(1))) 30077f68bb90af93b95045fb994e7cd68137adcc132Julien Lerouge return ExprError(); 30177f68bb90af93b95045fb994e7cd68137adcc132Julien Lerouge break; 30226a31428f130b66f61834d1b4d1cf72f590f70b9Nate Begeman } 30326a31428f130b66f61834d1b4d1cf72f590f70b9Nate Begeman 30426a31428f130b66f61834d1b4d1cf72f590f70b9Nate Begeman // Since the target specific builtins for each arch overlap, only check those 30526a31428f130b66f61834d1b4d1cf72f590f70b9Nate Begeman // of the arch we are compiling for. 30626a31428f130b66f61834d1b4d1cf72f590f70b9Nate Begeman if (BuiltinID >= Builtin::FirstTSBuiltin) { 307bcfd1f55bfbb3e5944cd5e03d07b343e280838c4Douglas Gregor switch (Context.getTargetInfo().getTriple().getArch()) { 30826a31428f130b66f61834d1b4d1cf72f590f70b9Nate Begeman case llvm::Triple::arm: 30926a31428f130b66f61834d1b4d1cf72f590f70b9Nate Begeman case llvm::Triple::thumb: 31026a31428f130b66f61834d1b4d1cf72f590f70b9Nate Begeman if (CheckARMBuiltinFunctionCall(BuiltinID, TheCall)) 31126a31428f130b66f61834d1b4d1cf72f590f70b9Nate Begeman return ExprError(); 31226a31428f130b66f61834d1b4d1cf72f590f70b9Nate Begeman break; 31326a31428f130b66f61834d1b4d1cf72f590f70b9Nate Begeman default: 31426a31428f130b66f61834d1b4d1cf72f590f70b9Nate Begeman break; 31526a31428f130b66f61834d1b4d1cf72f590f70b9Nate Begeman } 31626a31428f130b66f61834d1b4d1cf72f590f70b9Nate Begeman } 31726a31428f130b66f61834d1b4d1cf72f590f70b9Nate Begeman 31826a31428f130b66f61834d1b4d1cf72f590f70b9Nate Begeman return move(TheCallResult); 31926a31428f130b66f61834d1b4d1cf72f590f70b9Nate Begeman} 32026a31428f130b66f61834d1b4d1cf72f590f70b9Nate Begeman 32161eecf5aea018ea65c9ab0bccacd2996b15c632dNate Begeman// Get the valid immediate range for the specified NEON type code. 32261eecf5aea018ea65c9ab0bccacd2996b15c632dNate Begemanstatic unsigned RFT(unsigned t, bool shift = false) { 323da95f73b59f9af964e33725c515139d34c90c863Bob Wilson NeonTypeFlags Type(t); 324da95f73b59f9af964e33725c515139d34c90c863Bob Wilson int IsQuad = Type.isQuad(); 325da95f73b59f9af964e33725c515139d34c90c863Bob Wilson switch (Type.getEltType()) { 326da95f73b59f9af964e33725c515139d34c90c863Bob Wilson case NeonTypeFlags::Int8: 327da95f73b59f9af964e33725c515139d34c90c863Bob Wilson case NeonTypeFlags::Poly8: 328da95f73b59f9af964e33725c515139d34c90c863Bob Wilson return shift ? 7 : (8 << IsQuad) - 1; 329da95f73b59f9af964e33725c515139d34c90c863Bob Wilson case NeonTypeFlags::Int16: 330da95f73b59f9af964e33725c515139d34c90c863Bob Wilson case NeonTypeFlags::Poly16: 331da95f73b59f9af964e33725c515139d34c90c863Bob Wilson return shift ? 15 : (4 << IsQuad) - 1; 332da95f73b59f9af964e33725c515139d34c90c863Bob Wilson case NeonTypeFlags::Int32: 333da95f73b59f9af964e33725c515139d34c90c863Bob Wilson return shift ? 31 : (2 << IsQuad) - 1; 334da95f73b59f9af964e33725c515139d34c90c863Bob Wilson case NeonTypeFlags::Int64: 335da95f73b59f9af964e33725c515139d34c90c863Bob Wilson return shift ? 63 : (1 << IsQuad) - 1; 336da95f73b59f9af964e33725c515139d34c90c863Bob Wilson case NeonTypeFlags::Float16: 337da95f73b59f9af964e33725c515139d34c90c863Bob Wilson assert(!shift && "cannot shift float types!"); 338da95f73b59f9af964e33725c515139d34c90c863Bob Wilson return (4 << IsQuad) - 1; 339da95f73b59f9af964e33725c515139d34c90c863Bob Wilson case NeonTypeFlags::Float32: 340da95f73b59f9af964e33725c515139d34c90c863Bob Wilson assert(!shift && "cannot shift float types!"); 341da95f73b59f9af964e33725c515139d34c90c863Bob Wilson return (2 << IsQuad) - 1; 34261eecf5aea018ea65c9ab0bccacd2996b15c632dNate Begeman } 34361eecf5aea018ea65c9ab0bccacd2996b15c632dNate Begeman return 0; 34461eecf5aea018ea65c9ab0bccacd2996b15c632dNate Begeman} 34561eecf5aea018ea65c9ab0bccacd2996b15c632dNate Begeman 3466f9f03ef370ad48ece0c5d10edda28f39ccadb5dBob Wilson/// getNeonEltType - Return the QualType corresponding to the elements of 3476f9f03ef370ad48ece0c5d10edda28f39ccadb5dBob Wilson/// the vector type specified by the NeonTypeFlags. This is used to check 3486f9f03ef370ad48ece0c5d10edda28f39ccadb5dBob Wilson/// the pointer arguments for Neon load/store intrinsics. 3496f9f03ef370ad48ece0c5d10edda28f39ccadb5dBob Wilsonstatic QualType getNeonEltType(NeonTypeFlags Flags, ASTContext &Context) { 3506f9f03ef370ad48ece0c5d10edda28f39ccadb5dBob Wilson switch (Flags.getEltType()) { 3516f9f03ef370ad48ece0c5d10edda28f39ccadb5dBob Wilson case NeonTypeFlags::Int8: 3526f9f03ef370ad48ece0c5d10edda28f39ccadb5dBob Wilson return Flags.isUnsigned() ? Context.UnsignedCharTy : Context.SignedCharTy; 3536f9f03ef370ad48ece0c5d10edda28f39ccadb5dBob Wilson case NeonTypeFlags::Int16: 3546f9f03ef370ad48ece0c5d10edda28f39ccadb5dBob Wilson return Flags.isUnsigned() ? Context.UnsignedShortTy : Context.ShortTy; 3556f9f03ef370ad48ece0c5d10edda28f39ccadb5dBob Wilson case NeonTypeFlags::Int32: 3566f9f03ef370ad48ece0c5d10edda28f39ccadb5dBob Wilson return Flags.isUnsigned() ? Context.UnsignedIntTy : Context.IntTy; 3576f9f03ef370ad48ece0c5d10edda28f39ccadb5dBob Wilson case NeonTypeFlags::Int64: 3586f9f03ef370ad48ece0c5d10edda28f39ccadb5dBob Wilson return Flags.isUnsigned() ? Context.UnsignedLongLongTy : Context.LongLongTy; 3596f9f03ef370ad48ece0c5d10edda28f39ccadb5dBob Wilson case NeonTypeFlags::Poly8: 3606f9f03ef370ad48ece0c5d10edda28f39ccadb5dBob Wilson return Context.SignedCharTy; 3616f9f03ef370ad48ece0c5d10edda28f39ccadb5dBob Wilson case NeonTypeFlags::Poly16: 3626f9f03ef370ad48ece0c5d10edda28f39ccadb5dBob Wilson return Context.ShortTy; 3636f9f03ef370ad48ece0c5d10edda28f39ccadb5dBob Wilson case NeonTypeFlags::Float16: 3646f9f03ef370ad48ece0c5d10edda28f39ccadb5dBob Wilson return Context.UnsignedShortTy; 3656f9f03ef370ad48ece0c5d10edda28f39ccadb5dBob Wilson case NeonTypeFlags::Float32: 3666f9f03ef370ad48ece0c5d10edda28f39ccadb5dBob Wilson return Context.FloatTy; 3676f9f03ef370ad48ece0c5d10edda28f39ccadb5dBob Wilson } 3686f9f03ef370ad48ece0c5d10edda28f39ccadb5dBob Wilson return QualType(); 3696f9f03ef370ad48ece0c5d10edda28f39ccadb5dBob Wilson} 3706f9f03ef370ad48ece0c5d10edda28f39ccadb5dBob Wilson 37126a31428f130b66f61834d1b4d1cf72f590f70b9Nate Begemanbool Sema::CheckARMBuiltinFunctionCall(unsigned BuiltinID, CallExpr *TheCall) { 3721c2a88cfaeb11227d3a6bf7204207e0c8cf6de6fNate Begeman llvm::APSInt Result; 3731c2a88cfaeb11227d3a6bf7204207e0c8cf6de6fNate Begeman 3740d15c5321a11a5fee53b17ca8e9e0d72d6192b23Nate Begeman unsigned mask = 0; 37561eecf5aea018ea65c9ab0bccacd2996b15c632dNate Begeman unsigned TV = 0; 3764648255cebd2fc7c18293c1f93afd6e9add9ccccBob Wilson int PtrArgNum = -1; 3776f9f03ef370ad48ece0c5d10edda28f39ccadb5dBob Wilson bool HasConstPtr = false; 3781c2a88cfaeb11227d3a6bf7204207e0c8cf6de6fNate Begeman switch (BuiltinID) { 379a23326b5c244a03bf61ebb86db60a777ea26f926Nate Begeman#define GET_NEON_OVERLOAD_CHECK 380a23326b5c244a03bf61ebb86db60a777ea26f926Nate Begeman#include "clang/Basic/arm_neon.inc" 381a23326b5c244a03bf61ebb86db60a777ea26f926Nate Begeman#undef GET_NEON_OVERLOAD_CHECK 3821c2a88cfaeb11227d3a6bf7204207e0c8cf6de6fNate Begeman } 3831c2a88cfaeb11227d3a6bf7204207e0c8cf6de6fNate Begeman 3840d15c5321a11a5fee53b17ca8e9e0d72d6192b23Nate Begeman // For NEON intrinsics which are overloaded on vector element type, validate 3850d15c5321a11a5fee53b17ca8e9e0d72d6192b23Nate Begeman // the immediate which specifies which variant to emit. 3866f9f03ef370ad48ece0c5d10edda28f39ccadb5dBob Wilson unsigned ImmArg = TheCall->getNumArgs()-1; 3870d15c5321a11a5fee53b17ca8e9e0d72d6192b23Nate Begeman if (mask) { 3886f9f03ef370ad48ece0c5d10edda28f39ccadb5dBob Wilson if (SemaBuiltinConstantArg(TheCall, ImmArg, Result)) 3890d15c5321a11a5fee53b17ca8e9e0d72d6192b23Nate Begeman return true; 3900d15c5321a11a5fee53b17ca8e9e0d72d6192b23Nate Begeman 391da95f73b59f9af964e33725c515139d34c90c863Bob Wilson TV = Result.getLimitedValue(64); 392da95f73b59f9af964e33725c515139d34c90c863Bob Wilson if ((TV > 63) || (mask & (1 << TV)) == 0) 3930d15c5321a11a5fee53b17ca8e9e0d72d6192b23Nate Begeman return Diag(TheCall->getLocStart(), diag::err_invalid_neon_type_code) 3946f9f03ef370ad48ece0c5d10edda28f39ccadb5dBob Wilson << TheCall->getArg(ImmArg)->getSourceRange(); 3956f9f03ef370ad48ece0c5d10edda28f39ccadb5dBob Wilson } 3966f9f03ef370ad48ece0c5d10edda28f39ccadb5dBob Wilson 3974648255cebd2fc7c18293c1f93afd6e9add9ccccBob Wilson if (PtrArgNum >= 0) { 3986f9f03ef370ad48ece0c5d10edda28f39ccadb5dBob Wilson // Check that pointer arguments have the specified type. 3994648255cebd2fc7c18293c1f93afd6e9add9ccccBob Wilson Expr *Arg = TheCall->getArg(PtrArgNum); 4004648255cebd2fc7c18293c1f93afd6e9add9ccccBob Wilson if (ImplicitCastExpr *ICE = dyn_cast<ImplicitCastExpr>(Arg)) 4014648255cebd2fc7c18293c1f93afd6e9add9ccccBob Wilson Arg = ICE->getSubExpr(); 4024648255cebd2fc7c18293c1f93afd6e9add9ccccBob Wilson ExprResult RHS = DefaultFunctionArrayLvalueConversion(Arg); 4034648255cebd2fc7c18293c1f93afd6e9add9ccccBob Wilson QualType RHSTy = RHS.get()->getType(); 4044648255cebd2fc7c18293c1f93afd6e9add9ccccBob Wilson QualType EltTy = getNeonEltType(NeonTypeFlags(TV), Context); 4054648255cebd2fc7c18293c1f93afd6e9add9ccccBob Wilson if (HasConstPtr) 4064648255cebd2fc7c18293c1f93afd6e9add9ccccBob Wilson EltTy = EltTy.withConst(); 4074648255cebd2fc7c18293c1f93afd6e9add9ccccBob Wilson QualType LHSTy = Context.getPointerType(EltTy); 4084648255cebd2fc7c18293c1f93afd6e9add9ccccBob Wilson AssignConvertType ConvTy; 4094648255cebd2fc7c18293c1f93afd6e9add9ccccBob Wilson ConvTy = CheckSingleAssignmentConstraints(LHSTy, RHS); 4104648255cebd2fc7c18293c1f93afd6e9add9ccccBob Wilson if (RHS.isInvalid()) 4114648255cebd2fc7c18293c1f93afd6e9add9ccccBob Wilson return true; 4124648255cebd2fc7c18293c1f93afd6e9add9ccccBob Wilson if (DiagnoseAssignmentResult(ConvTy, Arg->getLocStart(), LHSTy, RHSTy, 4134648255cebd2fc7c18293c1f93afd6e9add9ccccBob Wilson RHS.get(), AA_Assigning)) 4144648255cebd2fc7c18293c1f93afd6e9add9ccccBob Wilson return true; 4150d15c5321a11a5fee53b17ca8e9e0d72d6192b23Nate Begeman } 4161c2a88cfaeb11227d3a6bf7204207e0c8cf6de6fNate Begeman 4170d15c5321a11a5fee53b17ca8e9e0d72d6192b23Nate Begeman // For NEON intrinsics which take an immediate value as part of the 4180d15c5321a11a5fee53b17ca8e9e0d72d6192b23Nate Begeman // instruction, range check them here. 41961eecf5aea018ea65c9ab0bccacd2996b15c632dNate Begeman unsigned i = 0, l = 0, u = 0; 4200d15c5321a11a5fee53b17ca8e9e0d72d6192b23Nate Begeman switch (BuiltinID) { 4210d15c5321a11a5fee53b17ca8e9e0d72d6192b23Nate Begeman default: return false; 422bb37f50c2d0d72e1fa5b349d5f6a11fdc5acb86eNate Begeman case ARM::BI__builtin_arm_ssat: i = 1; l = 1; u = 31; break; 423bb37f50c2d0d72e1fa5b349d5f6a11fdc5acb86eNate Begeman case ARM::BI__builtin_arm_usat: i = 1; u = 31; break; 42499c40bb13b523d58d7aeb6446e4f486d6918ca58Nate Begeman case ARM::BI__builtin_arm_vcvtr_f: 42599c40bb13b523d58d7aeb6446e4f486d6918ca58Nate Begeman case ARM::BI__builtin_arm_vcvtr_d: i = 1; u = 1; break; 426a23326b5c244a03bf61ebb86db60a777ea26f926Nate Begeman#define GET_NEON_IMMEDIATE_CHECK 427a23326b5c244a03bf61ebb86db60a777ea26f926Nate Begeman#include "clang/Basic/arm_neon.inc" 428a23326b5c244a03bf61ebb86db60a777ea26f926Nate Begeman#undef GET_NEON_IMMEDIATE_CHECK 4290d15c5321a11a5fee53b17ca8e9e0d72d6192b23Nate Begeman }; 4300d15c5321a11a5fee53b17ca8e9e0d72d6192b23Nate Begeman 43161eecf5aea018ea65c9ab0bccacd2996b15c632dNate Begeman // Check that the immediate argument is actually a constant. 4320d15c5321a11a5fee53b17ca8e9e0d72d6192b23Nate Begeman if (SemaBuiltinConstantArg(TheCall, i, Result)) 4330d15c5321a11a5fee53b17ca8e9e0d72d6192b23Nate Begeman return true; 4340d15c5321a11a5fee53b17ca8e9e0d72d6192b23Nate Begeman 43561eecf5aea018ea65c9ab0bccacd2996b15c632dNate Begeman // Range check against the upper/lower values for this isntruction. 4360d15c5321a11a5fee53b17ca8e9e0d72d6192b23Nate Begeman unsigned Val = Result.getZExtValue(); 43761eecf5aea018ea65c9ab0bccacd2996b15c632dNate Begeman if (Val < l || Val > (u + l)) 4380d15c5321a11a5fee53b17ca8e9e0d72d6192b23Nate Begeman return Diag(TheCall->getLocStart(), diag::err_argument_invalid_range) 439476d8b863cb65b2b5833235d97315cdb46e6f5aaBenjamin Kramer << l << u+l << TheCall->getArg(i)->getSourceRange(); 4400d15c5321a11a5fee53b17ca8e9e0d72d6192b23Nate Begeman 44199c40bb13b523d58d7aeb6446e4f486d6918ca58Nate Begeman // FIXME: VFP Intrinsics should error if VFP not present. 44226a31428f130b66f61834d1b4d1cf72f590f70b9Nate Begeman return false; 443d406bf0e8c17012110a8476d03c6f9a97b56ecf7Anders Carlsson} 444d406bf0e8c17012110a8476d03c6f9a97b56ecf7Anders Carlsson 445d406bf0e8c17012110a8476d03c6f9a97b56ecf7Anders Carlsson/// CheckFunctionCall - Check a direct function call for various correctness 446d406bf0e8c17012110a8476d03c6f9a97b56ecf7Anders Carlsson/// and safety properties not strictly enforced by the C type system. 447d406bf0e8c17012110a8476d03c6f9a97b56ecf7Anders Carlssonbool Sema::CheckFunctionCall(FunctionDecl *FDecl, CallExpr *TheCall) { 448d406bf0e8c17012110a8476d03c6f9a97b56ecf7Anders Carlsson // Get the IdentifierInfo* for the called function. 449d406bf0e8c17012110a8476d03c6f9a97b56ecf7Anders Carlsson IdentifierInfo *FnInfo = FDecl->getIdentifier(); 450de45428f923b38d80407dbb9ede0df504256f9f6Daniel Dunbar 451d406bf0e8c17012110a8476d03c6f9a97b56ecf7Anders Carlsson // None of the checks below are needed for functions that don't have 452d406bf0e8c17012110a8476d03c6f9a97b56ecf7Anders Carlsson // simple names (e.g., C++ conversion functions). 453d406bf0e8c17012110a8476d03c6f9a97b56ecf7Anders Carlsson if (!FnInfo) 454d406bf0e8c17012110a8476d03c6f9a97b56ecf7Anders Carlsson return false; 4551eb4433ac451dc16f4133a88af2d002ac26c58efMike Stump 456de45428f923b38d80407dbb9ede0df504256f9f6Daniel Dunbar // FIXME: This mechanism should be abstracted to be less fragile and 457de45428f923b38d80407dbb9ede0df504256f9f6Daniel Dunbar // more efficient. For example, just map function ids to custom 458de45428f923b38d80407dbb9ede0df504256f9f6Daniel Dunbar // handlers. 459de45428f923b38d80407dbb9ede0df504256f9f6Daniel Dunbar 460c82faca0be59b072b38bed375e21bd24f1f72647Ted Kremenek // Printf and scanf checking. 461c82faca0be59b072b38bed375e21bd24f1f72647Ted Kremenek for (specific_attr_iterator<FormatAttr> 462c82faca0be59b072b38bed375e21bd24f1f72647Ted Kremenek i = FDecl->specific_attr_begin<FormatAttr>(), 463c82faca0be59b072b38bed375e21bd24f1f72647Ted Kremenek e = FDecl->specific_attr_end<FormatAttr>(); i != e ; ++i) { 464c82faca0be59b072b38bed375e21bd24f1f72647Ted Kremenek 465c82faca0be59b072b38bed375e21bd24f1f72647Ted Kremenek const FormatAttr *Format = *i; 466826a3457f737f1fc45a22954fd1bfde38160c165Ted Kremenek const bool b = Format->getType() == "scanf"; 467826a3457f737f1fc45a22954fd1bfde38160c165Ted Kremenek if (b || CheckablePrintfAttr(Format, TheCall)) { 4683d692df4b9c58895f9843b03543ec57447c93679Ted Kremenek bool HasVAListArg = Format->getFirstArg() == 0; 469826a3457f737f1fc45a22954fd1bfde38160c165Ted Kremenek CheckPrintfScanfArguments(TheCall, HasVAListArg, 470826a3457f737f1fc45a22954fd1bfde38160c165Ted Kremenek Format->getFormatIdx() - 1, 471826a3457f737f1fc45a22954fd1bfde38160c165Ted Kremenek HasVAListArg ? 0 : Format->getFirstArg() - 1, 472826a3457f737f1fc45a22954fd1bfde38160c165Ted Kremenek !b); 4733c385e5f8d9008fff18597ca302be19fa86e51f6Douglas Gregor } 47459907c4d8f6fc8aacfdaa0273bd7a9c140fbb45fChris Lattner } 4751eb4433ac451dc16f4133a88af2d002ac26c58efMike Stump 476c82faca0be59b072b38bed375e21bd24f1f72647Ted Kremenek for (specific_attr_iterator<NonNullAttr> 477c82faca0be59b072b38bed375e21bd24f1f72647Ted Kremenek i = FDecl->specific_attr_begin<NonNullAttr>(), 478c82faca0be59b072b38bed375e21bd24f1f72647Ted Kremenek e = FDecl->specific_attr_end<NonNullAttr>(); i != e; ++i) { 479909a70d8a185f701c20bacc3c76f8f5979cbbc7cNick Lewycky CheckNonNullArguments(*i, TheCall->getArgs(), 480909a70d8a185f701c20bacc3c76f8f5979cbbc7cNick Lewycky TheCall->getCallee()->getLocStart()); 481c82faca0be59b072b38bed375e21bd24f1f72647Ted Kremenek } 4820eb23307222bda7ad95d968eac4e1ab30864b213Sebastian Redl 483bd5da9d1a711e90b3bc265b4798954085c0b48d9Ted Kremenek // Builtin handling 484707a23e8b87410332b55bb4534fa1c799edef38aDouglas Gregor int CMF = -1; 485707a23e8b87410332b55bb4534fa1c799edef38aDouglas Gregor switch (FDecl->getBuiltinID()) { 486707a23e8b87410332b55bb4534fa1c799edef38aDouglas Gregor case Builtin::BI__builtin_memset: 487707a23e8b87410332b55bb4534fa1c799edef38aDouglas Gregor case Builtin::BI__builtin___memset_chk: 488707a23e8b87410332b55bb4534fa1c799edef38aDouglas Gregor case Builtin::BImemset: 489707a23e8b87410332b55bb4534fa1c799edef38aDouglas Gregor CMF = CMF_Memset; 490707a23e8b87410332b55bb4534fa1c799edef38aDouglas Gregor break; 491707a23e8b87410332b55bb4534fa1c799edef38aDouglas Gregor 492707a23e8b87410332b55bb4534fa1c799edef38aDouglas Gregor case Builtin::BI__builtin_memcpy: 493707a23e8b87410332b55bb4534fa1c799edef38aDouglas Gregor case Builtin::BI__builtin___memcpy_chk: 494707a23e8b87410332b55bb4534fa1c799edef38aDouglas Gregor case Builtin::BImemcpy: 495707a23e8b87410332b55bb4534fa1c799edef38aDouglas Gregor CMF = CMF_Memcpy; 496707a23e8b87410332b55bb4534fa1c799edef38aDouglas Gregor break; 497707a23e8b87410332b55bb4534fa1c799edef38aDouglas Gregor 498707a23e8b87410332b55bb4534fa1c799edef38aDouglas Gregor case Builtin::BI__builtin_memmove: 499707a23e8b87410332b55bb4534fa1c799edef38aDouglas Gregor case Builtin::BI__builtin___memmove_chk: 500707a23e8b87410332b55bb4534fa1c799edef38aDouglas Gregor case Builtin::BImemmove: 501707a23e8b87410332b55bb4534fa1c799edef38aDouglas Gregor CMF = CMF_Memmove; 502707a23e8b87410332b55bb4534fa1c799edef38aDouglas Gregor break; 503bd5da9d1a711e90b3bc265b4798954085c0b48d9Ted Kremenek 504bd5da9d1a711e90b3bc265b4798954085c0b48d9Ted Kremenek case Builtin::BIstrlcpy: 505bd5da9d1a711e90b3bc265b4798954085c0b48d9Ted Kremenek case Builtin::BIstrlcat: 506bd5da9d1a711e90b3bc265b4798954085c0b48d9Ted Kremenek CheckStrlcpycatArguments(TheCall, FnInfo); 507bd5da9d1a711e90b3bc265b4798954085c0b48d9Ted Kremenek break; 508707a23e8b87410332b55bb4534fa1c799edef38aDouglas Gregor 509cc2f30c4ed7770b6005bd55b529a55c1fcc250fcMatt Beaumont-Gay case Builtin::BI__builtin_memcmp: 510cc2f30c4ed7770b6005bd55b529a55c1fcc250fcMatt Beaumont-Gay CMF = CMF_Memcmp; 511cc2f30c4ed7770b6005bd55b529a55c1fcc250fcMatt Beaumont-Gay break; 512cc2f30c4ed7770b6005bd55b529a55c1fcc250fcMatt Beaumont-Gay 513cda57822327499aeb6fe606f9cf5903cffca3444Nico Weber case Builtin::BI__builtin_strncpy: 514cda57822327499aeb6fe606f9cf5903cffca3444Nico Weber case Builtin::BI__builtin___strncpy_chk: 515cda57822327499aeb6fe606f9cf5903cffca3444Nico Weber case Builtin::BIstrncpy: 516cda57822327499aeb6fe606f9cf5903cffca3444Nico Weber CMF = CMF_Strncpy; 517cda57822327499aeb6fe606f9cf5903cffca3444Nico Weber break; 518cda57822327499aeb6fe606f9cf5903cffca3444Nico Weber 519cda57822327499aeb6fe606f9cf5903cffca3444Nico Weber case Builtin::BI__builtin_strncmp: 520cda57822327499aeb6fe606f9cf5903cffca3444Nico Weber CMF = CMF_Strncmp; 521cda57822327499aeb6fe606f9cf5903cffca3444Nico Weber break; 522cda57822327499aeb6fe606f9cf5903cffca3444Nico Weber 523cda57822327499aeb6fe606f9cf5903cffca3444Nico Weber case Builtin::BI__builtin_strncasecmp: 524cda57822327499aeb6fe606f9cf5903cffca3444Nico Weber CMF = CMF_Strncasecmp; 525cda57822327499aeb6fe606f9cf5903cffca3444Nico Weber break; 526cda57822327499aeb6fe606f9cf5903cffca3444Nico Weber 527cda57822327499aeb6fe606f9cf5903cffca3444Nico Weber case Builtin::BI__builtin_strncat: 528cda57822327499aeb6fe606f9cf5903cffca3444Nico Weber case Builtin::BIstrncat: 529cda57822327499aeb6fe606f9cf5903cffca3444Nico Weber CMF = CMF_Strncat; 530cda57822327499aeb6fe606f9cf5903cffca3444Nico Weber break; 531cda57822327499aeb6fe606f9cf5903cffca3444Nico Weber 532cda57822327499aeb6fe606f9cf5903cffca3444Nico Weber case Builtin::BI__builtin_strndup: 533cda57822327499aeb6fe606f9cf5903cffca3444Nico Weber case Builtin::BIstrndup: 534cda57822327499aeb6fe606f9cf5903cffca3444Nico Weber CMF = CMF_Strndup; 535cda57822327499aeb6fe606f9cf5903cffca3444Nico Weber break; 536cda57822327499aeb6fe606f9cf5903cffca3444Nico Weber 537707a23e8b87410332b55bb4534fa1c799edef38aDouglas Gregor default: 538707a23e8b87410332b55bb4534fa1c799edef38aDouglas Gregor if (FDecl->getLinkage() == ExternalLinkage && 539707a23e8b87410332b55bb4534fa1c799edef38aDouglas Gregor (!getLangOptions().CPlusPlus || FDecl->isExternC())) { 540707a23e8b87410332b55bb4534fa1c799edef38aDouglas Gregor if (FnInfo->isStr("memset")) 541707a23e8b87410332b55bb4534fa1c799edef38aDouglas Gregor CMF = CMF_Memset; 542707a23e8b87410332b55bb4534fa1c799edef38aDouglas Gregor else if (FnInfo->isStr("memcpy")) 543707a23e8b87410332b55bb4534fa1c799edef38aDouglas Gregor CMF = CMF_Memcpy; 544707a23e8b87410332b55bb4534fa1c799edef38aDouglas Gregor else if (FnInfo->isStr("memmove")) 545707a23e8b87410332b55bb4534fa1c799edef38aDouglas Gregor CMF = CMF_Memmove; 546cc2f30c4ed7770b6005bd55b529a55c1fcc250fcMatt Beaumont-Gay else if (FnInfo->isStr("memcmp")) 547cc2f30c4ed7770b6005bd55b529a55c1fcc250fcMatt Beaumont-Gay CMF = CMF_Memcmp; 548cda57822327499aeb6fe606f9cf5903cffca3444Nico Weber else if (FnInfo->isStr("strncpy")) 549cda57822327499aeb6fe606f9cf5903cffca3444Nico Weber CMF = CMF_Strncpy; 550cda57822327499aeb6fe606f9cf5903cffca3444Nico Weber else if (FnInfo->isStr("strncmp")) 551cda57822327499aeb6fe606f9cf5903cffca3444Nico Weber CMF = CMF_Strncmp; 552cda57822327499aeb6fe606f9cf5903cffca3444Nico Weber else if (FnInfo->isStr("strncasecmp")) 553cda57822327499aeb6fe606f9cf5903cffca3444Nico Weber CMF = CMF_Strncasecmp; 554cda57822327499aeb6fe606f9cf5903cffca3444Nico Weber else if (FnInfo->isStr("strncat")) 555cda57822327499aeb6fe606f9cf5903cffca3444Nico Weber CMF = CMF_Strncat; 556cda57822327499aeb6fe606f9cf5903cffca3444Nico Weber else if (FnInfo->isStr("strndup")) 557cda57822327499aeb6fe606f9cf5903cffca3444Nico Weber CMF = CMF_Strndup; 558707a23e8b87410332b55bb4534fa1c799edef38aDouglas Gregor } 559707a23e8b87410332b55bb4534fa1c799edef38aDouglas Gregor break; 56006bc9eb9908e42696775b395b290827bde468c8bDouglas Gregor } 561707a23e8b87410332b55bb4534fa1c799edef38aDouglas Gregor 562bd5da9d1a711e90b3bc265b4798954085c0b48d9Ted Kremenek // Memset/memcpy/memmove handling 563707a23e8b87410332b55bb4534fa1c799edef38aDouglas Gregor if (CMF != -1) 564cc2f30c4ed7770b6005bd55b529a55c1fcc250fcMatt Beaumont-Gay CheckMemaccessArguments(TheCall, CheckedMemoryFunction(CMF), FnInfo); 5657ccc95bceebb2d1c8fbe277c9e33bde7dc1ccbb1Chandler Carruth 566d406bf0e8c17012110a8476d03c6f9a97b56ecf7Anders Carlsson return false; 56771993dd85eed9cc42c6b2fa61ee5c53026b74817Anders Carlsson} 56871993dd85eed9cc42c6b2fa61ee5c53026b74817Anders Carlsson 569d406bf0e8c17012110a8476d03c6f9a97b56ecf7Anders Carlssonbool Sema::CheckBlockCall(NamedDecl *NDecl, CallExpr *TheCall) { 570725165f2846bd37d3aaf863747fa30126992085eFariborz Jahanian // Printf checking. 57140b598eea1310ec9ed554d56ce3e25b34c585458Argyrios Kyrtzidis const FormatAttr *Format = NDecl->getAttr<FormatAttr>(); 572725165f2846bd37d3aaf863747fa30126992085eFariborz Jahanian if (!Format) 573d406bf0e8c17012110a8476d03c6f9a97b56ecf7Anders Carlsson return false; 5741eb4433ac451dc16f4133a88af2d002ac26c58efMike Stump 575725165f2846bd37d3aaf863747fa30126992085eFariborz Jahanian const VarDecl *V = dyn_cast<VarDecl>(NDecl); 576725165f2846bd37d3aaf863747fa30126992085eFariborz Jahanian if (!V) 577d406bf0e8c17012110a8476d03c6f9a97b56ecf7Anders Carlsson return false; 5781eb4433ac451dc16f4133a88af2d002ac26c58efMike Stump 579725165f2846bd37d3aaf863747fa30126992085eFariborz Jahanian QualType Ty = V->getType(); 580725165f2846bd37d3aaf863747fa30126992085eFariborz Jahanian if (!Ty->isBlockPointerType()) 581d406bf0e8c17012110a8476d03c6f9a97b56ecf7Anders Carlsson return false; 5821eb4433ac451dc16f4133a88af2d002ac26c58efMike Stump 583826a3457f737f1fc45a22954fd1bfde38160c165Ted Kremenek const bool b = Format->getType() == "scanf"; 584826a3457f737f1fc45a22954fd1bfde38160c165Ted Kremenek if (!b && !CheckablePrintfAttr(Format, TheCall)) 585d406bf0e8c17012110a8476d03c6f9a97b56ecf7Anders Carlsson return false; 5861eb4433ac451dc16f4133a88af2d002ac26c58efMike Stump 587d406bf0e8c17012110a8476d03c6f9a97b56ecf7Anders Carlsson bool HasVAListArg = Format->getFirstArg() == 0; 588826a3457f737f1fc45a22954fd1bfde38160c165Ted Kremenek CheckPrintfScanfArguments(TheCall, HasVAListArg, Format->getFormatIdx() - 1, 589826a3457f737f1fc45a22954fd1bfde38160c165Ted Kremenek HasVAListArg ? 0 : Format->getFirstArg() - 1, !b); 590d406bf0e8c17012110a8476d03c6f9a97b56ecf7Anders Carlsson 591d406bf0e8c17012110a8476d03c6f9a97b56ecf7Anders Carlsson return false; 592725165f2846bd37d3aaf863747fa30126992085eFariborz Jahanian} 593725165f2846bd37d3aaf863747fa30126992085eFariborz Jahanian 594276b061970939293f1abaf694bd3ef05b2cbda79Eli FriedmanExprResult 595276b061970939293f1abaf694bd3ef05b2cbda79Eli FriedmanSema::SemaAtomicOpsOverloaded(ExprResult TheCallResult, AtomicExpr::AtomicOp Op) { 596276b061970939293f1abaf694bd3ef05b2cbda79Eli Friedman CallExpr *TheCall = cast<CallExpr>(TheCallResult.get()); 597276b061970939293f1abaf694bd3ef05b2cbda79Eli Friedman DeclRefExpr *DRE =cast<DeclRefExpr>(TheCall->getCallee()->IgnoreParenCasts()); 598276b061970939293f1abaf694bd3ef05b2cbda79Eli Friedman 599276b061970939293f1abaf694bd3ef05b2cbda79Eli Friedman // All these operations take one of the following four forms: 600276b061970939293f1abaf694bd3ef05b2cbda79Eli Friedman // T __atomic_load(_Atomic(T)*, int) (loads) 601276b061970939293f1abaf694bd3ef05b2cbda79Eli Friedman // T* __atomic_add(_Atomic(T*)*, ptrdiff_t, int) (pointer add/sub) 602276b061970939293f1abaf694bd3ef05b2cbda79Eli Friedman // int __atomic_compare_exchange_strong(_Atomic(T)*, T*, T, int, int) 603276b061970939293f1abaf694bd3ef05b2cbda79Eli Friedman // (cmpxchg) 604276b061970939293f1abaf694bd3ef05b2cbda79Eli Friedman // T __atomic_exchange(_Atomic(T)*, T, int) (everything else) 605276b061970939293f1abaf694bd3ef05b2cbda79Eli Friedman // where T is an appropriate type, and the int paremeterss are for orderings. 606276b061970939293f1abaf694bd3ef05b2cbda79Eli Friedman unsigned NumVals = 1; 607276b061970939293f1abaf694bd3ef05b2cbda79Eli Friedman unsigned NumOrders = 1; 608276b061970939293f1abaf694bd3ef05b2cbda79Eli Friedman if (Op == AtomicExpr::Load) { 609276b061970939293f1abaf694bd3ef05b2cbda79Eli Friedman NumVals = 0; 610276b061970939293f1abaf694bd3ef05b2cbda79Eli Friedman } else if (Op == AtomicExpr::CmpXchgWeak || Op == AtomicExpr::CmpXchgStrong) { 611276b061970939293f1abaf694bd3ef05b2cbda79Eli Friedman NumVals = 2; 612276b061970939293f1abaf694bd3ef05b2cbda79Eli Friedman NumOrders = 2; 613276b061970939293f1abaf694bd3ef05b2cbda79Eli Friedman } 614276b061970939293f1abaf694bd3ef05b2cbda79Eli Friedman 615276b061970939293f1abaf694bd3ef05b2cbda79Eli Friedman if (TheCall->getNumArgs() < NumVals+NumOrders+1) { 616276b061970939293f1abaf694bd3ef05b2cbda79Eli Friedman Diag(TheCall->getLocEnd(), diag::err_typecheck_call_too_few_args) 617276b061970939293f1abaf694bd3ef05b2cbda79Eli Friedman << 0 << NumVals+NumOrders+1 << TheCall->getNumArgs() 618276b061970939293f1abaf694bd3ef05b2cbda79Eli Friedman << TheCall->getCallee()->getSourceRange(); 619276b061970939293f1abaf694bd3ef05b2cbda79Eli Friedman return ExprError(); 620276b061970939293f1abaf694bd3ef05b2cbda79Eli Friedman } else if (TheCall->getNumArgs() > NumVals+NumOrders+1) { 621276b061970939293f1abaf694bd3ef05b2cbda79Eli Friedman Diag(TheCall->getArg(NumVals+NumOrders+1)->getLocStart(), 622276b061970939293f1abaf694bd3ef05b2cbda79Eli Friedman diag::err_typecheck_call_too_many_args) 623276b061970939293f1abaf694bd3ef05b2cbda79Eli Friedman << 0 << NumVals+NumOrders+1 << TheCall->getNumArgs() 624276b061970939293f1abaf694bd3ef05b2cbda79Eli Friedman << TheCall->getCallee()->getSourceRange(); 625276b061970939293f1abaf694bd3ef05b2cbda79Eli Friedman return ExprError(); 626276b061970939293f1abaf694bd3ef05b2cbda79Eli Friedman } 627276b061970939293f1abaf694bd3ef05b2cbda79Eli Friedman 628276b061970939293f1abaf694bd3ef05b2cbda79Eli Friedman // Inspect the first argument of the atomic operation. This should always be 629276b061970939293f1abaf694bd3ef05b2cbda79Eli Friedman // a pointer to an _Atomic type. 630dfa64ba45922e1c28e36341bdf34785fea74659bEli Friedman Expr *Ptr = TheCall->getArg(0); 631276b061970939293f1abaf694bd3ef05b2cbda79Eli Friedman Ptr = DefaultFunctionArrayLvalueConversion(Ptr).get(); 632276b061970939293f1abaf694bd3ef05b2cbda79Eli Friedman const PointerType *pointerType = Ptr->getType()->getAs<PointerType>(); 633276b061970939293f1abaf694bd3ef05b2cbda79Eli Friedman if (!pointerType) { 634276b061970939293f1abaf694bd3ef05b2cbda79Eli Friedman Diag(DRE->getLocStart(), diag::err_atomic_op_needs_atomic) 635276b061970939293f1abaf694bd3ef05b2cbda79Eli Friedman << Ptr->getType() << Ptr->getSourceRange(); 636276b061970939293f1abaf694bd3ef05b2cbda79Eli Friedman return ExprError(); 637276b061970939293f1abaf694bd3ef05b2cbda79Eli Friedman } 638276b061970939293f1abaf694bd3ef05b2cbda79Eli Friedman 639276b061970939293f1abaf694bd3ef05b2cbda79Eli Friedman QualType AtomTy = pointerType->getPointeeType(); 640276b061970939293f1abaf694bd3ef05b2cbda79Eli Friedman if (!AtomTy->isAtomicType()) { 641276b061970939293f1abaf694bd3ef05b2cbda79Eli Friedman Diag(DRE->getLocStart(), diag::err_atomic_op_needs_atomic) 642276b061970939293f1abaf694bd3ef05b2cbda79Eli Friedman << Ptr->getType() << Ptr->getSourceRange(); 643276b061970939293f1abaf694bd3ef05b2cbda79Eli Friedman return ExprError(); 644276b061970939293f1abaf694bd3ef05b2cbda79Eli Friedman } 645276b061970939293f1abaf694bd3ef05b2cbda79Eli Friedman QualType ValType = AtomTy->getAs<AtomicType>()->getValueType(); 646276b061970939293f1abaf694bd3ef05b2cbda79Eli Friedman 647276b061970939293f1abaf694bd3ef05b2cbda79Eli Friedman if ((Op == AtomicExpr::Add || Op == AtomicExpr::Sub) && 648276b061970939293f1abaf694bd3ef05b2cbda79Eli Friedman !ValType->isIntegerType() && !ValType->isPointerType()) { 649276b061970939293f1abaf694bd3ef05b2cbda79Eli Friedman Diag(DRE->getLocStart(), diag::err_atomic_op_needs_atomic_int_or_ptr) 650276b061970939293f1abaf694bd3ef05b2cbda79Eli Friedman << Ptr->getType() << Ptr->getSourceRange(); 651276b061970939293f1abaf694bd3ef05b2cbda79Eli Friedman return ExprError(); 652276b061970939293f1abaf694bd3ef05b2cbda79Eli Friedman } 653276b061970939293f1abaf694bd3ef05b2cbda79Eli Friedman 654276b061970939293f1abaf694bd3ef05b2cbda79Eli Friedman if (!ValType->isIntegerType() && 655276b061970939293f1abaf694bd3ef05b2cbda79Eli Friedman (Op == AtomicExpr::And || Op == AtomicExpr::Or || Op == AtomicExpr::Xor)){ 656276b061970939293f1abaf694bd3ef05b2cbda79Eli Friedman Diag(DRE->getLocStart(), diag::err_atomic_op_logical_needs_atomic_int) 657276b061970939293f1abaf694bd3ef05b2cbda79Eli Friedman << Ptr->getType() << Ptr->getSourceRange(); 658276b061970939293f1abaf694bd3ef05b2cbda79Eli Friedman return ExprError(); 659276b061970939293f1abaf694bd3ef05b2cbda79Eli Friedman } 660276b061970939293f1abaf694bd3ef05b2cbda79Eli Friedman 661276b061970939293f1abaf694bd3ef05b2cbda79Eli Friedman switch (ValType.getObjCLifetime()) { 662276b061970939293f1abaf694bd3ef05b2cbda79Eli Friedman case Qualifiers::OCL_None: 663276b061970939293f1abaf694bd3ef05b2cbda79Eli Friedman case Qualifiers::OCL_ExplicitNone: 664276b061970939293f1abaf694bd3ef05b2cbda79Eli Friedman // okay 665276b061970939293f1abaf694bd3ef05b2cbda79Eli Friedman break; 666276b061970939293f1abaf694bd3ef05b2cbda79Eli Friedman 667276b061970939293f1abaf694bd3ef05b2cbda79Eli Friedman case Qualifiers::OCL_Weak: 668276b061970939293f1abaf694bd3ef05b2cbda79Eli Friedman case Qualifiers::OCL_Strong: 669276b061970939293f1abaf694bd3ef05b2cbda79Eli Friedman case Qualifiers::OCL_Autoreleasing: 670276b061970939293f1abaf694bd3ef05b2cbda79Eli Friedman Diag(DRE->getLocStart(), diag::err_arc_atomic_ownership) 671276b061970939293f1abaf694bd3ef05b2cbda79Eli Friedman << ValType << Ptr->getSourceRange(); 672276b061970939293f1abaf694bd3ef05b2cbda79Eli Friedman return ExprError(); 673276b061970939293f1abaf694bd3ef05b2cbda79Eli Friedman } 674276b061970939293f1abaf694bd3ef05b2cbda79Eli Friedman 675276b061970939293f1abaf694bd3ef05b2cbda79Eli Friedman QualType ResultType = ValType; 676276b061970939293f1abaf694bd3ef05b2cbda79Eli Friedman if (Op == AtomicExpr::Store) 677276b061970939293f1abaf694bd3ef05b2cbda79Eli Friedman ResultType = Context.VoidTy; 678276b061970939293f1abaf694bd3ef05b2cbda79Eli Friedman else if (Op == AtomicExpr::CmpXchgWeak || Op == AtomicExpr::CmpXchgStrong) 679276b061970939293f1abaf694bd3ef05b2cbda79Eli Friedman ResultType = Context.BoolTy; 680276b061970939293f1abaf694bd3ef05b2cbda79Eli Friedman 681276b061970939293f1abaf694bd3ef05b2cbda79Eli Friedman // The first argument --- the pointer --- has a fixed type; we 682276b061970939293f1abaf694bd3ef05b2cbda79Eli Friedman // deduce the types of the rest of the arguments accordingly. Walk 683276b061970939293f1abaf694bd3ef05b2cbda79Eli Friedman // the remaining arguments, converting them to the deduced value type. 684276b061970939293f1abaf694bd3ef05b2cbda79Eli Friedman for (unsigned i = 1; i != NumVals+NumOrders+1; ++i) { 685276b061970939293f1abaf694bd3ef05b2cbda79Eli Friedman ExprResult Arg = TheCall->getArg(i); 686276b061970939293f1abaf694bd3ef05b2cbda79Eli Friedman QualType Ty; 687276b061970939293f1abaf694bd3ef05b2cbda79Eli Friedman if (i < NumVals+1) { 688276b061970939293f1abaf694bd3ef05b2cbda79Eli Friedman // The second argument to a cmpxchg is a pointer to the data which will 689276b061970939293f1abaf694bd3ef05b2cbda79Eli Friedman // be exchanged. The second argument to a pointer add/subtract is the 690276b061970939293f1abaf694bd3ef05b2cbda79Eli Friedman // amount to add/subtract, which must be a ptrdiff_t. The third 691276b061970939293f1abaf694bd3ef05b2cbda79Eli Friedman // argument to a cmpxchg and the second argument in all other cases 692276b061970939293f1abaf694bd3ef05b2cbda79Eli Friedman // is the type of the value. 693276b061970939293f1abaf694bd3ef05b2cbda79Eli Friedman if (i == 1 && (Op == AtomicExpr::CmpXchgWeak || 694276b061970939293f1abaf694bd3ef05b2cbda79Eli Friedman Op == AtomicExpr::CmpXchgStrong)) 695276b061970939293f1abaf694bd3ef05b2cbda79Eli Friedman Ty = Context.getPointerType(ValType.getUnqualifiedType()); 696276b061970939293f1abaf694bd3ef05b2cbda79Eli Friedman else if (!ValType->isIntegerType() && 697276b061970939293f1abaf694bd3ef05b2cbda79Eli Friedman (Op == AtomicExpr::Add || Op == AtomicExpr::Sub)) 698276b061970939293f1abaf694bd3ef05b2cbda79Eli Friedman Ty = Context.getPointerDiffType(); 699276b061970939293f1abaf694bd3ef05b2cbda79Eli Friedman else 700276b061970939293f1abaf694bd3ef05b2cbda79Eli Friedman Ty = ValType; 701276b061970939293f1abaf694bd3ef05b2cbda79Eli Friedman } else { 702276b061970939293f1abaf694bd3ef05b2cbda79Eli Friedman // The order(s) are always converted to int. 703276b061970939293f1abaf694bd3ef05b2cbda79Eli Friedman Ty = Context.IntTy; 704276b061970939293f1abaf694bd3ef05b2cbda79Eli Friedman } 705276b061970939293f1abaf694bd3ef05b2cbda79Eli Friedman InitializedEntity Entity = 706276b061970939293f1abaf694bd3ef05b2cbda79Eli Friedman InitializedEntity::InitializeParameter(Context, Ty, false); 707276b061970939293f1abaf694bd3ef05b2cbda79Eli Friedman Arg = PerformCopyInitialization(Entity, SourceLocation(), Arg); 708276b061970939293f1abaf694bd3ef05b2cbda79Eli Friedman if (Arg.isInvalid()) 709276b061970939293f1abaf694bd3ef05b2cbda79Eli Friedman return true; 710276b061970939293f1abaf694bd3ef05b2cbda79Eli Friedman TheCall->setArg(i, Arg.get()); 711276b061970939293f1abaf694bd3ef05b2cbda79Eli Friedman } 712276b061970939293f1abaf694bd3ef05b2cbda79Eli Friedman 713dfa64ba45922e1c28e36341bdf34785fea74659bEli Friedman SmallVector<Expr*, 5> SubExprs; 714dfa64ba45922e1c28e36341bdf34785fea74659bEli Friedman SubExprs.push_back(Ptr); 715276b061970939293f1abaf694bd3ef05b2cbda79Eli Friedman if (Op == AtomicExpr::Load) { 716dfa64ba45922e1c28e36341bdf34785fea74659bEli Friedman SubExprs.push_back(TheCall->getArg(1)); // Order 717276b061970939293f1abaf694bd3ef05b2cbda79Eli Friedman } else if (Op != AtomicExpr::CmpXchgWeak && Op != AtomicExpr::CmpXchgStrong) { 718dfa64ba45922e1c28e36341bdf34785fea74659bEli Friedman SubExprs.push_back(TheCall->getArg(2)); // Order 719dfa64ba45922e1c28e36341bdf34785fea74659bEli Friedman SubExprs.push_back(TheCall->getArg(1)); // Val1 720276b061970939293f1abaf694bd3ef05b2cbda79Eli Friedman } else { 721dfa64ba45922e1c28e36341bdf34785fea74659bEli Friedman SubExprs.push_back(TheCall->getArg(3)); // Order 722dfa64ba45922e1c28e36341bdf34785fea74659bEli Friedman SubExprs.push_back(TheCall->getArg(1)); // Val1 723dfa64ba45922e1c28e36341bdf34785fea74659bEli Friedman SubExprs.push_back(TheCall->getArg(2)); // Val2 724dfa64ba45922e1c28e36341bdf34785fea74659bEli Friedman SubExprs.push_back(TheCall->getArg(4)); // OrderFail 725276b061970939293f1abaf694bd3ef05b2cbda79Eli Friedman } 726dfa64ba45922e1c28e36341bdf34785fea74659bEli Friedman 727dfa64ba45922e1c28e36341bdf34785fea74659bEli Friedman return Owned(new (Context) AtomicExpr(TheCall->getCallee()->getLocStart(), 728dfa64ba45922e1c28e36341bdf34785fea74659bEli Friedman SubExprs.data(), SubExprs.size(), 729dfa64ba45922e1c28e36341bdf34785fea74659bEli Friedman ResultType, Op, 730dfa64ba45922e1c28e36341bdf34785fea74659bEli Friedman TheCall->getRParenLoc())); 731276b061970939293f1abaf694bd3ef05b2cbda79Eli Friedman} 732276b061970939293f1abaf694bd3ef05b2cbda79Eli Friedman 733276b061970939293f1abaf694bd3ef05b2cbda79Eli Friedman 7345f8d604246976a93a73549b07bbc8ee0b2061b50John McCall/// checkBuiltinArgument - Given a call to a builtin function, perform 7355f8d604246976a93a73549b07bbc8ee0b2061b50John McCall/// normal type-checking on the given argument, updating the call in 7365f8d604246976a93a73549b07bbc8ee0b2061b50John McCall/// place. This is useful when a builtin function requires custom 7375f8d604246976a93a73549b07bbc8ee0b2061b50John McCall/// type-checking for some of its arguments but not necessarily all of 7385f8d604246976a93a73549b07bbc8ee0b2061b50John McCall/// them. 7395f8d604246976a93a73549b07bbc8ee0b2061b50John McCall/// 7405f8d604246976a93a73549b07bbc8ee0b2061b50John McCall/// Returns true on error. 7415f8d604246976a93a73549b07bbc8ee0b2061b50John McCallstatic bool checkBuiltinArgument(Sema &S, CallExpr *E, unsigned ArgIndex) { 7425f8d604246976a93a73549b07bbc8ee0b2061b50John McCall FunctionDecl *Fn = E->getDirectCallee(); 7435f8d604246976a93a73549b07bbc8ee0b2061b50John McCall assert(Fn && "builtin call without direct callee!"); 7445f8d604246976a93a73549b07bbc8ee0b2061b50John McCall 7455f8d604246976a93a73549b07bbc8ee0b2061b50John McCall ParmVarDecl *Param = Fn->getParamDecl(ArgIndex); 7465f8d604246976a93a73549b07bbc8ee0b2061b50John McCall InitializedEntity Entity = 7475f8d604246976a93a73549b07bbc8ee0b2061b50John McCall InitializedEntity::InitializeParameter(S.Context, Param); 7485f8d604246976a93a73549b07bbc8ee0b2061b50John McCall 7495f8d604246976a93a73549b07bbc8ee0b2061b50John McCall ExprResult Arg = E->getArg(0); 7505f8d604246976a93a73549b07bbc8ee0b2061b50John McCall Arg = S.PerformCopyInitialization(Entity, SourceLocation(), Arg); 7515f8d604246976a93a73549b07bbc8ee0b2061b50John McCall if (Arg.isInvalid()) 7525f8d604246976a93a73549b07bbc8ee0b2061b50John McCall return true; 7535f8d604246976a93a73549b07bbc8ee0b2061b50John McCall 7545f8d604246976a93a73549b07bbc8ee0b2061b50John McCall E->setArg(ArgIndex, Arg.take()); 7555f8d604246976a93a73549b07bbc8ee0b2061b50John McCall return false; 7565f8d604246976a93a73549b07bbc8ee0b2061b50John McCall} 7575f8d604246976a93a73549b07bbc8ee0b2061b50John McCall 7585caa370ea6f70bd3e7e4a9cc3b69ac1a849c8534Chris Lattner/// SemaBuiltinAtomicOverloaded - We have a call to a function like 7595caa370ea6f70bd3e7e4a9cc3b69ac1a849c8534Chris Lattner/// __sync_fetch_and_add, which is an overloaded function based on the pointer 7605caa370ea6f70bd3e7e4a9cc3b69ac1a849c8534Chris Lattner/// type of its first argument. The main ActOnCallExpr routines have already 7615caa370ea6f70bd3e7e4a9cc3b69ac1a849c8534Chris Lattner/// promoted the types of arguments because all of these calls are prototyped as 7625caa370ea6f70bd3e7e4a9cc3b69ac1a849c8534Chris Lattner/// void(...). 7635caa370ea6f70bd3e7e4a9cc3b69ac1a849c8534Chris Lattner/// 7645caa370ea6f70bd3e7e4a9cc3b69ac1a849c8534Chris Lattner/// This function goes through and does final semantic checking for these 7655caa370ea6f70bd3e7e4a9cc3b69ac1a849c8534Chris Lattner/// builtins, 76660d7b3a319d84d688752be3870615ac0f111fb16John McCallExprResult 76760d7b3a319d84d688752be3870615ac0f111fb16John McCallSema::SemaBuiltinAtomicOverloaded(ExprResult TheCallResult) { 768d201457cc781f1b13d0f4b1268ff934e6004cbffChandler Carruth CallExpr *TheCall = (CallExpr *)TheCallResult.get(); 7695caa370ea6f70bd3e7e4a9cc3b69ac1a849c8534Chris Lattner DeclRefExpr *DRE =cast<DeclRefExpr>(TheCall->getCallee()->IgnoreParenCasts()); 7705caa370ea6f70bd3e7e4a9cc3b69ac1a849c8534Chris Lattner FunctionDecl *FDecl = cast<FunctionDecl>(DRE->getDecl()); 7715caa370ea6f70bd3e7e4a9cc3b69ac1a849c8534Chris Lattner 7725caa370ea6f70bd3e7e4a9cc3b69ac1a849c8534Chris Lattner // Ensure that we have at least one argument to do type inference from. 773d201457cc781f1b13d0f4b1268ff934e6004cbffChandler Carruth if (TheCall->getNumArgs() < 1) { 774d201457cc781f1b13d0f4b1268ff934e6004cbffChandler Carruth Diag(TheCall->getLocEnd(), diag::err_typecheck_call_too_few_args_at_least) 775d201457cc781f1b13d0f4b1268ff934e6004cbffChandler Carruth << 0 << 1 << TheCall->getNumArgs() 776d201457cc781f1b13d0f4b1268ff934e6004cbffChandler Carruth << TheCall->getCallee()->getSourceRange(); 777d201457cc781f1b13d0f4b1268ff934e6004cbffChandler Carruth return ExprError(); 778d201457cc781f1b13d0f4b1268ff934e6004cbffChandler Carruth } 7791eb4433ac451dc16f4133a88af2d002ac26c58efMike Stump 7805caa370ea6f70bd3e7e4a9cc3b69ac1a849c8534Chris Lattner // Inspect the first argument of the atomic builtin. This should always be 7815caa370ea6f70bd3e7e4a9cc3b69ac1a849c8534Chris Lattner // a pointer type, whose element is an integral scalar or pointer type. 7825caa370ea6f70bd3e7e4a9cc3b69ac1a849c8534Chris Lattner // Because it is a pointer type, we don't have to worry about any implicit 7835caa370ea6f70bd3e7e4a9cc3b69ac1a849c8534Chris Lattner // casts here. 784d201457cc781f1b13d0f4b1268ff934e6004cbffChandler Carruth // FIXME: We don't allow floating point scalars as input. 7855caa370ea6f70bd3e7e4a9cc3b69ac1a849c8534Chris Lattner Expr *FirstArg = TheCall->getArg(0); 786f85e193739c953358c865005855253af4f68a497John McCall const PointerType *pointerType = FirstArg->getType()->getAs<PointerType>(); 787f85e193739c953358c865005855253af4f68a497John McCall if (!pointerType) { 788d201457cc781f1b13d0f4b1268ff934e6004cbffChandler Carruth Diag(DRE->getLocStart(), diag::err_atomic_builtin_must_be_pointer) 789d201457cc781f1b13d0f4b1268ff934e6004cbffChandler Carruth << FirstArg->getType() << FirstArg->getSourceRange(); 790d201457cc781f1b13d0f4b1268ff934e6004cbffChandler Carruth return ExprError(); 791d201457cc781f1b13d0f4b1268ff934e6004cbffChandler Carruth } 7921eb4433ac451dc16f4133a88af2d002ac26c58efMike Stump 793f85e193739c953358c865005855253af4f68a497John McCall QualType ValType = pointerType->getPointeeType(); 794dd5fa7a21ca9db9d620001ca977681a1b724e3feChris Lattner if (!ValType->isIntegerType() && !ValType->isAnyPointerType() && 795d201457cc781f1b13d0f4b1268ff934e6004cbffChandler Carruth !ValType->isBlockPointerType()) { 796d201457cc781f1b13d0f4b1268ff934e6004cbffChandler Carruth Diag(DRE->getLocStart(), diag::err_atomic_builtin_must_be_pointer_intptr) 797d201457cc781f1b13d0f4b1268ff934e6004cbffChandler Carruth << FirstArg->getType() << FirstArg->getSourceRange(); 798d201457cc781f1b13d0f4b1268ff934e6004cbffChandler Carruth return ExprError(); 799d201457cc781f1b13d0f4b1268ff934e6004cbffChandler Carruth } 8005caa370ea6f70bd3e7e4a9cc3b69ac1a849c8534Chris Lattner 801f85e193739c953358c865005855253af4f68a497John McCall switch (ValType.getObjCLifetime()) { 802f85e193739c953358c865005855253af4f68a497John McCall case Qualifiers::OCL_None: 803f85e193739c953358c865005855253af4f68a497John McCall case Qualifiers::OCL_ExplicitNone: 804f85e193739c953358c865005855253af4f68a497John McCall // okay 805f85e193739c953358c865005855253af4f68a497John McCall break; 806f85e193739c953358c865005855253af4f68a497John McCall 807f85e193739c953358c865005855253af4f68a497John McCall case Qualifiers::OCL_Weak: 808f85e193739c953358c865005855253af4f68a497John McCall case Qualifiers::OCL_Strong: 809f85e193739c953358c865005855253af4f68a497John McCall case Qualifiers::OCL_Autoreleasing: 810b8b0313e84700b5c6d597b3be4de41c97b7550f1Argyrios Kyrtzidis Diag(DRE->getLocStart(), diag::err_arc_atomic_ownership) 811f85e193739c953358c865005855253af4f68a497John McCall << ValType << FirstArg->getSourceRange(); 812f85e193739c953358c865005855253af4f68a497John McCall return ExprError(); 813f85e193739c953358c865005855253af4f68a497John McCall } 814f85e193739c953358c865005855253af4f68a497John McCall 815b45ae256cfd5ef3ab22b4d715159f978d8120d45John McCall // Strip any qualifiers off ValType. 816b45ae256cfd5ef3ab22b4d715159f978d8120d45John McCall ValType = ValType.getUnqualifiedType(); 817b45ae256cfd5ef3ab22b4d715159f978d8120d45John McCall 8188d13d221cf7c1657404c611efaadf3ac19d899b3Chandler Carruth // The majority of builtins return a value, but a few have special return 8198d13d221cf7c1657404c611efaadf3ac19d899b3Chandler Carruth // types, so allow them to override appropriately below. 8208d13d221cf7c1657404c611efaadf3ac19d899b3Chandler Carruth QualType ResultType = ValType; 8218d13d221cf7c1657404c611efaadf3ac19d899b3Chandler Carruth 8225caa370ea6f70bd3e7e4a9cc3b69ac1a849c8534Chris Lattner // We need to figure out which concrete builtin this maps onto. For example, 8235caa370ea6f70bd3e7e4a9cc3b69ac1a849c8534Chris Lattner // __sync_fetch_and_add with a 2 byte object turns into 8245caa370ea6f70bd3e7e4a9cc3b69ac1a849c8534Chris Lattner // __sync_fetch_and_add_2. 8255caa370ea6f70bd3e7e4a9cc3b69ac1a849c8534Chris Lattner#define BUILTIN_ROW(x) \ 8265caa370ea6f70bd3e7e4a9cc3b69ac1a849c8534Chris Lattner { Builtin::BI##x##_1, Builtin::BI##x##_2, Builtin::BI##x##_4, \ 8275caa370ea6f70bd3e7e4a9cc3b69ac1a849c8534Chris Lattner Builtin::BI##x##_8, Builtin::BI##x##_16 } 8281eb4433ac451dc16f4133a88af2d002ac26c58efMike Stump 8295caa370ea6f70bd3e7e4a9cc3b69ac1a849c8534Chris Lattner static const unsigned BuiltinIndices[][5] = { 8305caa370ea6f70bd3e7e4a9cc3b69ac1a849c8534Chris Lattner BUILTIN_ROW(__sync_fetch_and_add), 8315caa370ea6f70bd3e7e4a9cc3b69ac1a849c8534Chris Lattner BUILTIN_ROW(__sync_fetch_and_sub), 8325caa370ea6f70bd3e7e4a9cc3b69ac1a849c8534Chris Lattner BUILTIN_ROW(__sync_fetch_and_or), 8335caa370ea6f70bd3e7e4a9cc3b69ac1a849c8534Chris Lattner BUILTIN_ROW(__sync_fetch_and_and), 8345caa370ea6f70bd3e7e4a9cc3b69ac1a849c8534Chris Lattner BUILTIN_ROW(__sync_fetch_and_xor), 8351eb4433ac451dc16f4133a88af2d002ac26c58efMike Stump 8365caa370ea6f70bd3e7e4a9cc3b69ac1a849c8534Chris Lattner BUILTIN_ROW(__sync_add_and_fetch), 8375caa370ea6f70bd3e7e4a9cc3b69ac1a849c8534Chris Lattner BUILTIN_ROW(__sync_sub_and_fetch), 8385caa370ea6f70bd3e7e4a9cc3b69ac1a849c8534Chris Lattner BUILTIN_ROW(__sync_and_and_fetch), 8395caa370ea6f70bd3e7e4a9cc3b69ac1a849c8534Chris Lattner BUILTIN_ROW(__sync_or_and_fetch), 8405caa370ea6f70bd3e7e4a9cc3b69ac1a849c8534Chris Lattner BUILTIN_ROW(__sync_xor_and_fetch), 8411eb4433ac451dc16f4133a88af2d002ac26c58efMike Stump 8425caa370ea6f70bd3e7e4a9cc3b69ac1a849c8534Chris Lattner BUILTIN_ROW(__sync_val_compare_and_swap), 8435caa370ea6f70bd3e7e4a9cc3b69ac1a849c8534Chris Lattner BUILTIN_ROW(__sync_bool_compare_and_swap), 8445caa370ea6f70bd3e7e4a9cc3b69ac1a849c8534Chris Lattner BUILTIN_ROW(__sync_lock_test_and_set), 84523aa9c8ca0bc441aab2a38a4c9fc7a1c9e9ac16aChris Lattner BUILTIN_ROW(__sync_lock_release), 84623aa9c8ca0bc441aab2a38a4c9fc7a1c9e9ac16aChris Lattner BUILTIN_ROW(__sync_swap) 8475caa370ea6f70bd3e7e4a9cc3b69ac1a849c8534Chris Lattner }; 8481eb4433ac451dc16f4133a88af2d002ac26c58efMike Stump#undef BUILTIN_ROW 8491eb4433ac451dc16f4133a88af2d002ac26c58efMike Stump 8505caa370ea6f70bd3e7e4a9cc3b69ac1a849c8534Chris Lattner // Determine the index of the size. 8515caa370ea6f70bd3e7e4a9cc3b69ac1a849c8534Chris Lattner unsigned SizeIndex; 852199c3d6cd16aebbb9c7f0d42af9d922c9628bf70Ken Dyck switch (Context.getTypeSizeInChars(ValType).getQuantity()) { 8535caa370ea6f70bd3e7e4a9cc3b69ac1a849c8534Chris Lattner case 1: SizeIndex = 0; break; 8545caa370ea6f70bd3e7e4a9cc3b69ac1a849c8534Chris Lattner case 2: SizeIndex = 1; break; 8555caa370ea6f70bd3e7e4a9cc3b69ac1a849c8534Chris Lattner case 4: SizeIndex = 2; break; 8565caa370ea6f70bd3e7e4a9cc3b69ac1a849c8534Chris Lattner case 8: SizeIndex = 3; break; 8575caa370ea6f70bd3e7e4a9cc3b69ac1a849c8534Chris Lattner case 16: SizeIndex = 4; break; 8585caa370ea6f70bd3e7e4a9cc3b69ac1a849c8534Chris Lattner default: 859d201457cc781f1b13d0f4b1268ff934e6004cbffChandler Carruth Diag(DRE->getLocStart(), diag::err_atomic_builtin_pointer_size) 860d201457cc781f1b13d0f4b1268ff934e6004cbffChandler Carruth << FirstArg->getType() << FirstArg->getSourceRange(); 861d201457cc781f1b13d0f4b1268ff934e6004cbffChandler Carruth return ExprError(); 8625caa370ea6f70bd3e7e4a9cc3b69ac1a849c8534Chris Lattner } 8631eb4433ac451dc16f4133a88af2d002ac26c58efMike Stump 8645caa370ea6f70bd3e7e4a9cc3b69ac1a849c8534Chris Lattner // Each of these builtins has one pointer argument, followed by some number of 8655caa370ea6f70bd3e7e4a9cc3b69ac1a849c8534Chris Lattner // values (0, 1 or 2) followed by a potentially empty varags list of stuff 8665caa370ea6f70bd3e7e4a9cc3b69ac1a849c8534Chris Lattner // that we ignore. Find out which row of BuiltinIndices to read from as well 8675caa370ea6f70bd3e7e4a9cc3b69ac1a849c8534Chris Lattner // as the number of fixed args. 8687814e6d6645d587891293d59ecf6576defcfac92Douglas Gregor unsigned BuiltinID = FDecl->getBuiltinID(); 8695caa370ea6f70bd3e7e4a9cc3b69ac1a849c8534Chris Lattner unsigned BuiltinIndex, NumFixed = 1; 8705caa370ea6f70bd3e7e4a9cc3b69ac1a849c8534Chris Lattner switch (BuiltinID) { 871b219cfc4d75f0a03630b7c4509ef791b7e97b2c8David Blaikie default: llvm_unreachable("Unknown overloaded atomic builtin!"); 872a9766411aaaa1446a5da96dc5042de8da05d89bdDouglas Gregor case Builtin::BI__sync_fetch_and_add: 873a9766411aaaa1446a5da96dc5042de8da05d89bdDouglas Gregor case Builtin::BI__sync_fetch_and_add_1: 874a9766411aaaa1446a5da96dc5042de8da05d89bdDouglas Gregor case Builtin::BI__sync_fetch_and_add_2: 875a9766411aaaa1446a5da96dc5042de8da05d89bdDouglas Gregor case Builtin::BI__sync_fetch_and_add_4: 876a9766411aaaa1446a5da96dc5042de8da05d89bdDouglas Gregor case Builtin::BI__sync_fetch_and_add_8: 877a9766411aaaa1446a5da96dc5042de8da05d89bdDouglas Gregor case Builtin::BI__sync_fetch_and_add_16: 878a9766411aaaa1446a5da96dc5042de8da05d89bdDouglas Gregor BuiltinIndex = 0; 879a9766411aaaa1446a5da96dc5042de8da05d89bdDouglas Gregor break; 880a9766411aaaa1446a5da96dc5042de8da05d89bdDouglas Gregor 881a9766411aaaa1446a5da96dc5042de8da05d89bdDouglas Gregor case Builtin::BI__sync_fetch_and_sub: 882a9766411aaaa1446a5da96dc5042de8da05d89bdDouglas Gregor case Builtin::BI__sync_fetch_and_sub_1: 883a9766411aaaa1446a5da96dc5042de8da05d89bdDouglas Gregor case Builtin::BI__sync_fetch_and_sub_2: 884a9766411aaaa1446a5da96dc5042de8da05d89bdDouglas Gregor case Builtin::BI__sync_fetch_and_sub_4: 885a9766411aaaa1446a5da96dc5042de8da05d89bdDouglas Gregor case Builtin::BI__sync_fetch_and_sub_8: 886a9766411aaaa1446a5da96dc5042de8da05d89bdDouglas Gregor case Builtin::BI__sync_fetch_and_sub_16: 887a9766411aaaa1446a5da96dc5042de8da05d89bdDouglas Gregor BuiltinIndex = 1; 888a9766411aaaa1446a5da96dc5042de8da05d89bdDouglas Gregor break; 889a9766411aaaa1446a5da96dc5042de8da05d89bdDouglas Gregor 890a9766411aaaa1446a5da96dc5042de8da05d89bdDouglas Gregor case Builtin::BI__sync_fetch_and_or: 891a9766411aaaa1446a5da96dc5042de8da05d89bdDouglas Gregor case Builtin::BI__sync_fetch_and_or_1: 892a9766411aaaa1446a5da96dc5042de8da05d89bdDouglas Gregor case Builtin::BI__sync_fetch_and_or_2: 893a9766411aaaa1446a5da96dc5042de8da05d89bdDouglas Gregor case Builtin::BI__sync_fetch_and_or_4: 894a9766411aaaa1446a5da96dc5042de8da05d89bdDouglas Gregor case Builtin::BI__sync_fetch_and_or_8: 895a9766411aaaa1446a5da96dc5042de8da05d89bdDouglas Gregor case Builtin::BI__sync_fetch_and_or_16: 896a9766411aaaa1446a5da96dc5042de8da05d89bdDouglas Gregor BuiltinIndex = 2; 897a9766411aaaa1446a5da96dc5042de8da05d89bdDouglas Gregor break; 898a9766411aaaa1446a5da96dc5042de8da05d89bdDouglas Gregor 899a9766411aaaa1446a5da96dc5042de8da05d89bdDouglas Gregor case Builtin::BI__sync_fetch_and_and: 900a9766411aaaa1446a5da96dc5042de8da05d89bdDouglas Gregor case Builtin::BI__sync_fetch_and_and_1: 901a9766411aaaa1446a5da96dc5042de8da05d89bdDouglas Gregor case Builtin::BI__sync_fetch_and_and_2: 902a9766411aaaa1446a5da96dc5042de8da05d89bdDouglas Gregor case Builtin::BI__sync_fetch_and_and_4: 903a9766411aaaa1446a5da96dc5042de8da05d89bdDouglas Gregor case Builtin::BI__sync_fetch_and_and_8: 904a9766411aaaa1446a5da96dc5042de8da05d89bdDouglas Gregor case Builtin::BI__sync_fetch_and_and_16: 905a9766411aaaa1446a5da96dc5042de8da05d89bdDouglas Gregor BuiltinIndex = 3; 906a9766411aaaa1446a5da96dc5042de8da05d89bdDouglas Gregor break; 907a9766411aaaa1446a5da96dc5042de8da05d89bdDouglas Gregor 908a9766411aaaa1446a5da96dc5042de8da05d89bdDouglas Gregor case Builtin::BI__sync_fetch_and_xor: 909a9766411aaaa1446a5da96dc5042de8da05d89bdDouglas Gregor case Builtin::BI__sync_fetch_and_xor_1: 910a9766411aaaa1446a5da96dc5042de8da05d89bdDouglas Gregor case Builtin::BI__sync_fetch_and_xor_2: 911a9766411aaaa1446a5da96dc5042de8da05d89bdDouglas Gregor case Builtin::BI__sync_fetch_and_xor_4: 912a9766411aaaa1446a5da96dc5042de8da05d89bdDouglas Gregor case Builtin::BI__sync_fetch_and_xor_8: 913a9766411aaaa1446a5da96dc5042de8da05d89bdDouglas Gregor case Builtin::BI__sync_fetch_and_xor_16: 914a9766411aaaa1446a5da96dc5042de8da05d89bdDouglas Gregor BuiltinIndex = 4; 915a9766411aaaa1446a5da96dc5042de8da05d89bdDouglas Gregor break; 916a9766411aaaa1446a5da96dc5042de8da05d89bdDouglas Gregor 917a9766411aaaa1446a5da96dc5042de8da05d89bdDouglas Gregor case Builtin::BI__sync_add_and_fetch: 918a9766411aaaa1446a5da96dc5042de8da05d89bdDouglas Gregor case Builtin::BI__sync_add_and_fetch_1: 919a9766411aaaa1446a5da96dc5042de8da05d89bdDouglas Gregor case Builtin::BI__sync_add_and_fetch_2: 920a9766411aaaa1446a5da96dc5042de8da05d89bdDouglas Gregor case Builtin::BI__sync_add_and_fetch_4: 921a9766411aaaa1446a5da96dc5042de8da05d89bdDouglas Gregor case Builtin::BI__sync_add_and_fetch_8: 922a9766411aaaa1446a5da96dc5042de8da05d89bdDouglas Gregor case Builtin::BI__sync_add_and_fetch_16: 923a9766411aaaa1446a5da96dc5042de8da05d89bdDouglas Gregor BuiltinIndex = 5; 924a9766411aaaa1446a5da96dc5042de8da05d89bdDouglas Gregor break; 925a9766411aaaa1446a5da96dc5042de8da05d89bdDouglas Gregor 926a9766411aaaa1446a5da96dc5042de8da05d89bdDouglas Gregor case Builtin::BI__sync_sub_and_fetch: 927a9766411aaaa1446a5da96dc5042de8da05d89bdDouglas Gregor case Builtin::BI__sync_sub_and_fetch_1: 928a9766411aaaa1446a5da96dc5042de8da05d89bdDouglas Gregor case Builtin::BI__sync_sub_and_fetch_2: 929a9766411aaaa1446a5da96dc5042de8da05d89bdDouglas Gregor case Builtin::BI__sync_sub_and_fetch_4: 930a9766411aaaa1446a5da96dc5042de8da05d89bdDouglas Gregor case Builtin::BI__sync_sub_and_fetch_8: 931a9766411aaaa1446a5da96dc5042de8da05d89bdDouglas Gregor case Builtin::BI__sync_sub_and_fetch_16: 932a9766411aaaa1446a5da96dc5042de8da05d89bdDouglas Gregor BuiltinIndex = 6; 933a9766411aaaa1446a5da96dc5042de8da05d89bdDouglas Gregor break; 934a9766411aaaa1446a5da96dc5042de8da05d89bdDouglas Gregor 935a9766411aaaa1446a5da96dc5042de8da05d89bdDouglas Gregor case Builtin::BI__sync_and_and_fetch: 936a9766411aaaa1446a5da96dc5042de8da05d89bdDouglas Gregor case Builtin::BI__sync_and_and_fetch_1: 937a9766411aaaa1446a5da96dc5042de8da05d89bdDouglas Gregor case Builtin::BI__sync_and_and_fetch_2: 938a9766411aaaa1446a5da96dc5042de8da05d89bdDouglas Gregor case Builtin::BI__sync_and_and_fetch_4: 939a9766411aaaa1446a5da96dc5042de8da05d89bdDouglas Gregor case Builtin::BI__sync_and_and_fetch_8: 940a9766411aaaa1446a5da96dc5042de8da05d89bdDouglas Gregor case Builtin::BI__sync_and_and_fetch_16: 941a9766411aaaa1446a5da96dc5042de8da05d89bdDouglas Gregor BuiltinIndex = 7; 942a9766411aaaa1446a5da96dc5042de8da05d89bdDouglas Gregor break; 943a9766411aaaa1446a5da96dc5042de8da05d89bdDouglas Gregor 944a9766411aaaa1446a5da96dc5042de8da05d89bdDouglas Gregor case Builtin::BI__sync_or_and_fetch: 945a9766411aaaa1446a5da96dc5042de8da05d89bdDouglas Gregor case Builtin::BI__sync_or_and_fetch_1: 946a9766411aaaa1446a5da96dc5042de8da05d89bdDouglas Gregor case Builtin::BI__sync_or_and_fetch_2: 947a9766411aaaa1446a5da96dc5042de8da05d89bdDouglas Gregor case Builtin::BI__sync_or_and_fetch_4: 948a9766411aaaa1446a5da96dc5042de8da05d89bdDouglas Gregor case Builtin::BI__sync_or_and_fetch_8: 949a9766411aaaa1446a5da96dc5042de8da05d89bdDouglas Gregor case Builtin::BI__sync_or_and_fetch_16: 950a9766411aaaa1446a5da96dc5042de8da05d89bdDouglas Gregor BuiltinIndex = 8; 951a9766411aaaa1446a5da96dc5042de8da05d89bdDouglas Gregor break; 952a9766411aaaa1446a5da96dc5042de8da05d89bdDouglas Gregor 953a9766411aaaa1446a5da96dc5042de8da05d89bdDouglas Gregor case Builtin::BI__sync_xor_and_fetch: 954a9766411aaaa1446a5da96dc5042de8da05d89bdDouglas Gregor case Builtin::BI__sync_xor_and_fetch_1: 955a9766411aaaa1446a5da96dc5042de8da05d89bdDouglas Gregor case Builtin::BI__sync_xor_and_fetch_2: 956a9766411aaaa1446a5da96dc5042de8da05d89bdDouglas Gregor case Builtin::BI__sync_xor_and_fetch_4: 957a9766411aaaa1446a5da96dc5042de8da05d89bdDouglas Gregor case Builtin::BI__sync_xor_and_fetch_8: 958a9766411aaaa1446a5da96dc5042de8da05d89bdDouglas Gregor case Builtin::BI__sync_xor_and_fetch_16: 959a9766411aaaa1446a5da96dc5042de8da05d89bdDouglas Gregor BuiltinIndex = 9; 960a9766411aaaa1446a5da96dc5042de8da05d89bdDouglas Gregor break; 9611eb4433ac451dc16f4133a88af2d002ac26c58efMike Stump 9625caa370ea6f70bd3e7e4a9cc3b69ac1a849c8534Chris Lattner case Builtin::BI__sync_val_compare_and_swap: 963a9766411aaaa1446a5da96dc5042de8da05d89bdDouglas Gregor case Builtin::BI__sync_val_compare_and_swap_1: 964a9766411aaaa1446a5da96dc5042de8da05d89bdDouglas Gregor case Builtin::BI__sync_val_compare_and_swap_2: 965a9766411aaaa1446a5da96dc5042de8da05d89bdDouglas Gregor case Builtin::BI__sync_val_compare_and_swap_4: 966a9766411aaaa1446a5da96dc5042de8da05d89bdDouglas Gregor case Builtin::BI__sync_val_compare_and_swap_8: 967a9766411aaaa1446a5da96dc5042de8da05d89bdDouglas Gregor case Builtin::BI__sync_val_compare_and_swap_16: 9687eff7c4153faf45b19b5919ef409ee5f6794eb25Daniel Dunbar BuiltinIndex = 10; 9695caa370ea6f70bd3e7e4a9cc3b69ac1a849c8534Chris Lattner NumFixed = 2; 9705caa370ea6f70bd3e7e4a9cc3b69ac1a849c8534Chris Lattner break; 971a9766411aaaa1446a5da96dc5042de8da05d89bdDouglas Gregor 9725caa370ea6f70bd3e7e4a9cc3b69ac1a849c8534Chris Lattner case Builtin::BI__sync_bool_compare_and_swap: 973a9766411aaaa1446a5da96dc5042de8da05d89bdDouglas Gregor case Builtin::BI__sync_bool_compare_and_swap_1: 974a9766411aaaa1446a5da96dc5042de8da05d89bdDouglas Gregor case Builtin::BI__sync_bool_compare_and_swap_2: 975a9766411aaaa1446a5da96dc5042de8da05d89bdDouglas Gregor case Builtin::BI__sync_bool_compare_and_swap_4: 976a9766411aaaa1446a5da96dc5042de8da05d89bdDouglas Gregor case Builtin::BI__sync_bool_compare_and_swap_8: 977a9766411aaaa1446a5da96dc5042de8da05d89bdDouglas Gregor case Builtin::BI__sync_bool_compare_and_swap_16: 9787eff7c4153faf45b19b5919ef409ee5f6794eb25Daniel Dunbar BuiltinIndex = 11; 9795caa370ea6f70bd3e7e4a9cc3b69ac1a849c8534Chris Lattner NumFixed = 2; 9808d13d221cf7c1657404c611efaadf3ac19d899b3Chandler Carruth ResultType = Context.BoolTy; 9815caa370ea6f70bd3e7e4a9cc3b69ac1a849c8534Chris Lattner break; 982a9766411aaaa1446a5da96dc5042de8da05d89bdDouglas Gregor 983a9766411aaaa1446a5da96dc5042de8da05d89bdDouglas Gregor case Builtin::BI__sync_lock_test_and_set: 984a9766411aaaa1446a5da96dc5042de8da05d89bdDouglas Gregor case Builtin::BI__sync_lock_test_and_set_1: 985a9766411aaaa1446a5da96dc5042de8da05d89bdDouglas Gregor case Builtin::BI__sync_lock_test_and_set_2: 986a9766411aaaa1446a5da96dc5042de8da05d89bdDouglas Gregor case Builtin::BI__sync_lock_test_and_set_4: 987a9766411aaaa1446a5da96dc5042de8da05d89bdDouglas Gregor case Builtin::BI__sync_lock_test_and_set_8: 988a9766411aaaa1446a5da96dc5042de8da05d89bdDouglas Gregor case Builtin::BI__sync_lock_test_and_set_16: 989a9766411aaaa1446a5da96dc5042de8da05d89bdDouglas Gregor BuiltinIndex = 12; 990a9766411aaaa1446a5da96dc5042de8da05d89bdDouglas Gregor break; 991a9766411aaaa1446a5da96dc5042de8da05d89bdDouglas Gregor 9925caa370ea6f70bd3e7e4a9cc3b69ac1a849c8534Chris Lattner case Builtin::BI__sync_lock_release: 993a9766411aaaa1446a5da96dc5042de8da05d89bdDouglas Gregor case Builtin::BI__sync_lock_release_1: 994a9766411aaaa1446a5da96dc5042de8da05d89bdDouglas Gregor case Builtin::BI__sync_lock_release_2: 995a9766411aaaa1446a5da96dc5042de8da05d89bdDouglas Gregor case Builtin::BI__sync_lock_release_4: 996a9766411aaaa1446a5da96dc5042de8da05d89bdDouglas Gregor case Builtin::BI__sync_lock_release_8: 997a9766411aaaa1446a5da96dc5042de8da05d89bdDouglas Gregor case Builtin::BI__sync_lock_release_16: 9987eff7c4153faf45b19b5919ef409ee5f6794eb25Daniel Dunbar BuiltinIndex = 13; 9995caa370ea6f70bd3e7e4a9cc3b69ac1a849c8534Chris Lattner NumFixed = 0; 10008d13d221cf7c1657404c611efaadf3ac19d899b3Chandler Carruth ResultType = Context.VoidTy; 10015caa370ea6f70bd3e7e4a9cc3b69ac1a849c8534Chris Lattner break; 1002a9766411aaaa1446a5da96dc5042de8da05d89bdDouglas Gregor 1003a9766411aaaa1446a5da96dc5042de8da05d89bdDouglas Gregor case Builtin::BI__sync_swap: 1004a9766411aaaa1446a5da96dc5042de8da05d89bdDouglas Gregor case Builtin::BI__sync_swap_1: 1005a9766411aaaa1446a5da96dc5042de8da05d89bdDouglas Gregor case Builtin::BI__sync_swap_2: 1006a9766411aaaa1446a5da96dc5042de8da05d89bdDouglas Gregor case Builtin::BI__sync_swap_4: 1007a9766411aaaa1446a5da96dc5042de8da05d89bdDouglas Gregor case Builtin::BI__sync_swap_8: 1008a9766411aaaa1446a5da96dc5042de8da05d89bdDouglas Gregor case Builtin::BI__sync_swap_16: 1009a9766411aaaa1446a5da96dc5042de8da05d89bdDouglas Gregor BuiltinIndex = 14; 1010a9766411aaaa1446a5da96dc5042de8da05d89bdDouglas Gregor break; 10115caa370ea6f70bd3e7e4a9cc3b69ac1a849c8534Chris Lattner } 10121eb4433ac451dc16f4133a88af2d002ac26c58efMike Stump 10135caa370ea6f70bd3e7e4a9cc3b69ac1a849c8534Chris Lattner // Now that we know how many fixed arguments we expect, first check that we 10145caa370ea6f70bd3e7e4a9cc3b69ac1a849c8534Chris Lattner // have at least that many. 1015d201457cc781f1b13d0f4b1268ff934e6004cbffChandler Carruth if (TheCall->getNumArgs() < 1+NumFixed) { 1016d201457cc781f1b13d0f4b1268ff934e6004cbffChandler Carruth Diag(TheCall->getLocEnd(), diag::err_typecheck_call_too_few_args_at_least) 1017d201457cc781f1b13d0f4b1268ff934e6004cbffChandler Carruth << 0 << 1+NumFixed << TheCall->getNumArgs() 1018d201457cc781f1b13d0f4b1268ff934e6004cbffChandler Carruth << TheCall->getCallee()->getSourceRange(); 1019d201457cc781f1b13d0f4b1268ff934e6004cbffChandler Carruth return ExprError(); 1020d201457cc781f1b13d0f4b1268ff934e6004cbffChandler Carruth } 10211eb4433ac451dc16f4133a88af2d002ac26c58efMike Stump 1022e7ac0a94f1dee3fae9292eb8372962b6d70b3e0dChris Lattner // Get the decl for the concrete builtin from this, we can tell what the 1023e7ac0a94f1dee3fae9292eb8372962b6d70b3e0dChris Lattner // concrete integer type we should convert to is. 1024e7ac0a94f1dee3fae9292eb8372962b6d70b3e0dChris Lattner unsigned NewBuiltinID = BuiltinIndices[BuiltinIndex][SizeIndex]; 1025e7ac0a94f1dee3fae9292eb8372962b6d70b3e0dChris Lattner const char *NewBuiltinName = Context.BuiltinInfo.GetName(NewBuiltinID); 1026e7ac0a94f1dee3fae9292eb8372962b6d70b3e0dChris Lattner IdentifierInfo *NewBuiltinII = PP.getIdentifierInfo(NewBuiltinName); 10271eb4433ac451dc16f4133a88af2d002ac26c58efMike Stump FunctionDecl *NewBuiltinDecl = 1028e7ac0a94f1dee3fae9292eb8372962b6d70b3e0dChris Lattner cast<FunctionDecl>(LazilyCreateBuiltin(NewBuiltinII, NewBuiltinID, 1029e7ac0a94f1dee3fae9292eb8372962b6d70b3e0dChris Lattner TUScope, false, DRE->getLocStart())); 1030d201457cc781f1b13d0f4b1268ff934e6004cbffChandler Carruth 1031f871d0cc377a1367b519a6cce26be74607566ebaJohn McCall // The first argument --- the pointer --- has a fixed type; we 1032f871d0cc377a1367b519a6cce26be74607566ebaJohn McCall // deduce the types of the rest of the arguments accordingly. Walk 1033f871d0cc377a1367b519a6cce26be74607566ebaJohn McCall // the remaining arguments, converting them to the deduced value type. 10345caa370ea6f70bd3e7e4a9cc3b69ac1a849c8534Chris Lattner for (unsigned i = 0; i != NumFixed; ++i) { 1035429bb276991ff2dbc7c5b438828b9b7737cb15ebJohn Wiegley ExprResult Arg = TheCall->getArg(i+1); 10361eb4433ac451dc16f4133a88af2d002ac26c58efMike Stump 10375caa370ea6f70bd3e7e4a9cc3b69ac1a849c8534Chris Lattner // GCC does an implicit conversion to the pointer or integer ValType. This 10385caa370ea6f70bd3e7e4a9cc3b69ac1a849c8534Chris Lattner // can fail in some cases (1i -> int**), check for this error case now. 1039b45ae256cfd5ef3ab22b4d715159f978d8120d45John McCall // Initialize the argument. 1040b45ae256cfd5ef3ab22b4d715159f978d8120d45John McCall InitializedEntity Entity = InitializedEntity::InitializeParameter(Context, 1041b45ae256cfd5ef3ab22b4d715159f978d8120d45John McCall ValType, /*consume*/ false); 1042b45ae256cfd5ef3ab22b4d715159f978d8120d45John McCall Arg = PerformCopyInitialization(Entity, SourceLocation(), Arg); 1043429bb276991ff2dbc7c5b438828b9b7737cb15ebJohn Wiegley if (Arg.isInvalid()) 1044d201457cc781f1b13d0f4b1268ff934e6004cbffChandler Carruth return ExprError(); 10451eb4433ac451dc16f4133a88af2d002ac26c58efMike Stump 10465caa370ea6f70bd3e7e4a9cc3b69ac1a849c8534Chris Lattner // Okay, we have something that *can* be converted to the right type. Check 10475caa370ea6f70bd3e7e4a9cc3b69ac1a849c8534Chris Lattner // to see if there is a potentially weird extension going on here. This can 10485caa370ea6f70bd3e7e4a9cc3b69ac1a849c8534Chris Lattner // happen when you do an atomic operation on something like an char* and 10495caa370ea6f70bd3e7e4a9cc3b69ac1a849c8534Chris Lattner // pass in 42. The 42 gets converted to char. This is even more strange 10505caa370ea6f70bd3e7e4a9cc3b69ac1a849c8534Chris Lattner // for things like 45.123 -> char, etc. 10511eb4433ac451dc16f4133a88af2d002ac26c58efMike Stump // FIXME: Do this check. 1052b45ae256cfd5ef3ab22b4d715159f978d8120d45John McCall TheCall->setArg(i+1, Arg.take()); 10535caa370ea6f70bd3e7e4a9cc3b69ac1a849c8534Chris Lattner } 10541eb4433ac451dc16f4133a88af2d002ac26c58efMike Stump 1055bbcb7ea8a062a8f1d5cb504e4518a5d4fbab873aDouglas Gregor ASTContext& Context = this->getASTContext(); 1056bbcb7ea8a062a8f1d5cb504e4518a5d4fbab873aDouglas Gregor 1057bbcb7ea8a062a8f1d5cb504e4518a5d4fbab873aDouglas Gregor // Create a new DeclRefExpr to refer to the new decl. 1058bbcb7ea8a062a8f1d5cb504e4518a5d4fbab873aDouglas Gregor DeclRefExpr* NewDRE = DeclRefExpr::Create( 1059bbcb7ea8a062a8f1d5cb504e4518a5d4fbab873aDouglas Gregor Context, 1060bbcb7ea8a062a8f1d5cb504e4518a5d4fbab873aDouglas Gregor DRE->getQualifierLoc(), 1061bbcb7ea8a062a8f1d5cb504e4518a5d4fbab873aDouglas Gregor NewBuiltinDecl, 1062bbcb7ea8a062a8f1d5cb504e4518a5d4fbab873aDouglas Gregor DRE->getLocation(), 1063bbcb7ea8a062a8f1d5cb504e4518a5d4fbab873aDouglas Gregor NewBuiltinDecl->getType(), 1064bbcb7ea8a062a8f1d5cb504e4518a5d4fbab873aDouglas Gregor DRE->getValueKind()); 10651eb4433ac451dc16f4133a88af2d002ac26c58efMike Stump 10665caa370ea6f70bd3e7e4a9cc3b69ac1a849c8534Chris Lattner // Set the callee in the CallExpr. 10675caa370ea6f70bd3e7e4a9cc3b69ac1a849c8534Chris Lattner // FIXME: This leaks the original parens and implicit casts. 1068bbcb7ea8a062a8f1d5cb504e4518a5d4fbab873aDouglas Gregor ExprResult PromotedCall = UsualUnaryConversions(NewDRE); 1069429bb276991ff2dbc7c5b438828b9b7737cb15ebJohn Wiegley if (PromotedCall.isInvalid()) 1070429bb276991ff2dbc7c5b438828b9b7737cb15ebJohn Wiegley return ExprError(); 1071429bb276991ff2dbc7c5b438828b9b7737cb15ebJohn Wiegley TheCall->setCallee(PromotedCall.take()); 10721eb4433ac451dc16f4133a88af2d002ac26c58efMike Stump 1073db4325b098eff5e9e660db19f0148423fb21f27fChandler Carruth // Change the result type of the call to match the original value type. This 1074db4325b098eff5e9e660db19f0148423fb21f27fChandler Carruth // is arbitrary, but the codegen for these builtins ins design to handle it 1075db4325b098eff5e9e660db19f0148423fb21f27fChandler Carruth // gracefully. 10768d13d221cf7c1657404c611efaadf3ac19d899b3Chandler Carruth TheCall->setType(ResultType); 1077d201457cc781f1b13d0f4b1268ff934e6004cbffChandler Carruth 1078d201457cc781f1b13d0f4b1268ff934e6004cbffChandler Carruth return move(TheCallResult); 10795caa370ea6f70bd3e7e4a9cc3b69ac1a849c8534Chris Lattner} 10805caa370ea6f70bd3e7e4a9cc3b69ac1a849c8534Chris Lattner 1081690398188ea5b428f06aa13c7d4ce6eb741ad4f9Chris Lattner/// CheckObjCString - Checks that the argument to the builtin 108271993dd85eed9cc42c6b2fa61ee5c53026b74817Anders Carlsson/// CFString constructor is correct 1083fd942628abfe30e30427875db953222ae99b4325Steve Naroff/// Note: It might also make sense to do the UTF-16 conversion here (would 1084fd942628abfe30e30427875db953222ae99b4325Steve Naroff/// simplify the backend). 1085690398188ea5b428f06aa13c7d4ce6eb741ad4f9Chris Lattnerbool Sema::CheckObjCString(Expr *Arg) { 108656f349400c5932a196509c0480ff6f99a9a0b48fChris Lattner Arg = Arg->IgnoreParenCasts(); 108771993dd85eed9cc42c6b2fa61ee5c53026b74817Anders Carlsson StringLiteral *Literal = dyn_cast<StringLiteral>(Arg); 108871993dd85eed9cc42c6b2fa61ee5c53026b74817Anders Carlsson 10895cee1195584fa8672253139c86e922daeda69b9eDouglas Gregor if (!Literal || !Literal->isAscii()) { 1090fa25bbb351f4fdd977f51254119cdfc2b525ce90Chris Lattner Diag(Arg->getLocStart(), diag::err_cfstring_literal_not_string_constant) 1091fa25bbb351f4fdd977f51254119cdfc2b525ce90Chris Lattner << Arg->getSourceRange(); 10929cdc4d3834f203dcde3ff274b8928e4620a914d5Anders Carlsson return true; 109371993dd85eed9cc42c6b2fa61ee5c53026b74817Anders Carlsson } 10941eb4433ac451dc16f4133a88af2d002ac26c58efMike Stump 10957da71020b97c69b95831bd03d35e8e8404bfdea0Fariborz Jahanian if (Literal->containsNonAsciiOrNull()) { 10965f9e272e632e951b1efe824cd16acb4d96077930Chris Lattner StringRef String = Literal->getString(); 10977da71020b97c69b95831bd03d35e8e8404bfdea0Fariborz Jahanian unsigned NumBytes = String.size(); 10985f9e272e632e951b1efe824cd16acb4d96077930Chris Lattner SmallVector<UTF16, 128> ToBuf(NumBytes); 10997da71020b97c69b95831bd03d35e8e8404bfdea0Fariborz Jahanian const UTF8 *FromPtr = (UTF8 *)String.data(); 11007da71020b97c69b95831bd03d35e8e8404bfdea0Fariborz Jahanian UTF16 *ToPtr = &ToBuf[0]; 11017da71020b97c69b95831bd03d35e8e8404bfdea0Fariborz Jahanian 11027da71020b97c69b95831bd03d35e8e8404bfdea0Fariborz Jahanian ConversionResult Result = ConvertUTF8toUTF16(&FromPtr, FromPtr + NumBytes, 11037da71020b97c69b95831bd03d35e8e8404bfdea0Fariborz Jahanian &ToPtr, ToPtr + NumBytes, 11047da71020b97c69b95831bd03d35e8e8404bfdea0Fariborz Jahanian strictConversion); 11057da71020b97c69b95831bd03d35e8e8404bfdea0Fariborz Jahanian // Check for conversion failure. 11067da71020b97c69b95831bd03d35e8e8404bfdea0Fariborz Jahanian if (Result != conversionOK) 11077da71020b97c69b95831bd03d35e8e8404bfdea0Fariborz Jahanian Diag(Arg->getLocStart(), 11087da71020b97c69b95831bd03d35e8e8404bfdea0Fariborz Jahanian diag::warn_cfstring_truncated) << Arg->getSourceRange(); 11097da71020b97c69b95831bd03d35e8e8404bfdea0Fariborz Jahanian } 11109cdc4d3834f203dcde3ff274b8928e4620a914d5Anders Carlsson return false; 111159907c4d8f6fc8aacfdaa0273bd7a9c140fbb45fChris Lattner} 111259907c4d8f6fc8aacfdaa0273bd7a9c140fbb45fChris Lattner 1113c27c665c88b49dfb212aedc7bab8b9bf67658b9eChris Lattner/// SemaBuiltinVAStart - Check the arguments to __builtin_va_start for validity. 1114c27c665c88b49dfb212aedc7bab8b9bf67658b9eChris Lattner/// Emit an error and return true on failure, return false on success. 1115925e60d3fa706f31886027c876989af79eb0e0d2Chris Lattnerbool Sema::SemaBuiltinVAStart(CallExpr *TheCall) { 1116925e60d3fa706f31886027c876989af79eb0e0d2Chris Lattner Expr *Fn = TheCall->getCallee(); 1117925e60d3fa706f31886027c876989af79eb0e0d2Chris Lattner if (TheCall->getNumArgs() > 2) { 11182c21a073525cdfa68e4439b7af551385dc2796abChris Lattner Diag(TheCall->getArg(2)->getLocStart(), 1119fa25bbb351f4fdd977f51254119cdfc2b525ce90Chris Lattner diag::err_typecheck_call_too_many_args) 1120ccfa9639f8d09733bcf1c2572c5bd3daba5bd632Eric Christopher << 0 /*function call*/ << 2 << TheCall->getNumArgs() 1121ccfa9639f8d09733bcf1c2572c5bd3daba5bd632Eric Christopher << Fn->getSourceRange() 11221eb4433ac451dc16f4133a88af2d002ac26c58efMike Stump << SourceRange(TheCall->getArg(2)->getLocStart(), 1123fa25bbb351f4fdd977f51254119cdfc2b525ce90Chris Lattner (*(TheCall->arg_end()-1))->getLocEnd()); 112430ce344307f8a8b00054021307015571f83c7364Chris Lattner return true; 112530ce344307f8a8b00054021307015571f83c7364Chris Lattner } 112656f20ae1010aa71defd7572f660b41288c56cdd1Eli Friedman 112756f20ae1010aa71defd7572f660b41288c56cdd1Eli Friedman if (TheCall->getNumArgs() < 2) { 1128d77b9a29651d748f0e30a8dad8969635fc04f725Eric Christopher return Diag(TheCall->getLocEnd(), 1129d77b9a29651d748f0e30a8dad8969635fc04f725Eric Christopher diag::err_typecheck_call_too_few_args_at_least) 1130d77b9a29651d748f0e30a8dad8969635fc04f725Eric Christopher << 0 /*function call*/ << 2 << TheCall->getNumArgs(); 113156f20ae1010aa71defd7572f660b41288c56cdd1Eli Friedman } 113256f20ae1010aa71defd7572f660b41288c56cdd1Eli Friedman 11335f8d604246976a93a73549b07bbc8ee0b2061b50John McCall // Type-check the first argument normally. 11345f8d604246976a93a73549b07bbc8ee0b2061b50John McCall if (checkBuiltinArgument(*this, TheCall, 0)) 11355f8d604246976a93a73549b07bbc8ee0b2061b50John McCall return true; 11365f8d604246976a93a73549b07bbc8ee0b2061b50John McCall 1137c27c665c88b49dfb212aedc7bab8b9bf67658b9eChris Lattner // Determine whether the current function is variadic or not. 11389ea9bdbc14374f7bacdb50d3e52c664ff12150ffDouglas Gregor BlockScopeInfo *CurBlock = getCurBlock(); 1139c27c665c88b49dfb212aedc7bab8b9bf67658b9eChris Lattner bool isVariadic; 1140cd9c51433c06705645d1ee5a13da3c9a72d7d025Steve Naroff if (CurBlock) 1141c71a4915ca216847599d03cab4ed1c5086b0eb43John McCall isVariadic = CurBlock->TheDecl->isVariadic(); 11429498d388810d284d3970aef0d69fa4d069fd6cafTed Kremenek else if (FunctionDecl *FD = getCurFunctionDecl()) 11439498d388810d284d3970aef0d69fa4d069fd6cafTed Kremenek isVariadic = FD->isVariadic(); 11449498d388810d284d3970aef0d69fa4d069fd6cafTed Kremenek else 114553d0ea5f5bfa647ec23418bf3a3b7c183b51e4bdArgyrios Kyrtzidis isVariadic = getCurMethodDecl()->isVariadic(); 11461eb4433ac451dc16f4133a88af2d002ac26c58efMike Stump 1147c27c665c88b49dfb212aedc7bab8b9bf67658b9eChris Lattner if (!isVariadic) { 114830ce344307f8a8b00054021307015571f83c7364Chris Lattner Diag(Fn->getLocStart(), diag::err_va_start_used_in_non_variadic_function); 114930ce344307f8a8b00054021307015571f83c7364Chris Lattner return true; 115030ce344307f8a8b00054021307015571f83c7364Chris Lattner } 11511eb4433ac451dc16f4133a88af2d002ac26c58efMike Stump 115230ce344307f8a8b00054021307015571f83c7364Chris Lattner // Verify that the second argument to the builtin is the last argument of the 115330ce344307f8a8b00054021307015571f83c7364Chris Lattner // current function or method. 115430ce344307f8a8b00054021307015571f83c7364Chris Lattner bool SecondArgIsLastNamedArgument = false; 1155e2c14103dec39cbd24dac9d7b3e91277b109c14fAnders Carlsson const Expr *Arg = TheCall->getArg(1)->IgnoreParenCasts(); 11561eb4433ac451dc16f4133a88af2d002ac26c58efMike Stump 115788cf226caee50956ef47edd4d44cf7b80703a26cAnders Carlsson if (const DeclRefExpr *DR = dyn_cast<DeclRefExpr>(Arg)) { 115888cf226caee50956ef47edd4d44cf7b80703a26cAnders Carlsson if (const ParmVarDecl *PV = dyn_cast<ParmVarDecl>(DR->getDecl())) { 115930ce344307f8a8b00054021307015571f83c7364Chris Lattner // FIXME: This isn't correct for methods (results in bogus warning). 116030ce344307f8a8b00054021307015571f83c7364Chris Lattner // Get the last formal in the current function. 116188cf226caee50956ef47edd4d44cf7b80703a26cAnders Carlsson const ParmVarDecl *LastArg; 1162cd9c51433c06705645d1ee5a13da3c9a72d7d025Steve Naroff if (CurBlock) 1163cd9c51433c06705645d1ee5a13da3c9a72d7d025Steve Naroff LastArg = *(CurBlock->TheDecl->param_end()-1); 1164cd9c51433c06705645d1ee5a13da3c9a72d7d025Steve Naroff else if (FunctionDecl *FD = getCurFunctionDecl()) 1165371f258e61e1365b951b17931a3c5ac1530fd1a0Chris Lattner LastArg = *(FD->param_end()-1); 116630ce344307f8a8b00054021307015571f83c7364Chris Lattner else 116753d0ea5f5bfa647ec23418bf3a3b7c183b51e4bdArgyrios Kyrtzidis LastArg = *(getCurMethodDecl()->param_end()-1); 116830ce344307f8a8b00054021307015571f83c7364Chris Lattner SecondArgIsLastNamedArgument = PV == LastArg; 116930ce344307f8a8b00054021307015571f83c7364Chris Lattner } 117030ce344307f8a8b00054021307015571f83c7364Chris Lattner } 11711eb4433ac451dc16f4133a88af2d002ac26c58efMike Stump 117230ce344307f8a8b00054021307015571f83c7364Chris Lattner if (!SecondArgIsLastNamedArgument) 11731eb4433ac451dc16f4133a88af2d002ac26c58efMike Stump Diag(TheCall->getArg(1)->getLocStart(), 117430ce344307f8a8b00054021307015571f83c7364Chris Lattner diag::warn_second_parameter_of_va_start_not_last_named_argument); 117530ce344307f8a8b00054021307015571f83c7364Chris Lattner return false; 11766cfda23b3768f93a6eb0b2a9135c8334a20125bbEli Friedman} 117730ce344307f8a8b00054021307015571f83c7364Chris Lattner 11781b9a0793955070738cac6f04b5abe9496be9b317Chris Lattner/// SemaBuiltinUnorderedCompare - Handle functions like __builtin_isgreater and 11791b9a0793955070738cac6f04b5abe9496be9b317Chris Lattner/// friends. This is declared to take (...), so we have to check everything. 1180925e60d3fa706f31886027c876989af79eb0e0d2Chris Lattnerbool Sema::SemaBuiltinUnorderedCompare(CallExpr *TheCall) { 1181925e60d3fa706f31886027c876989af79eb0e0d2Chris Lattner if (TheCall->getNumArgs() < 2) 11822c21a073525cdfa68e4439b7af551385dc2796abChris Lattner return Diag(TheCall->getLocEnd(), diag::err_typecheck_call_too_few_args) 1183d77b9a29651d748f0e30a8dad8969635fc04f725Eric Christopher << 0 << 2 << TheCall->getNumArgs()/*function call*/; 1184925e60d3fa706f31886027c876989af79eb0e0d2Chris Lattner if (TheCall->getNumArgs() > 2) 11851eb4433ac451dc16f4133a88af2d002ac26c58efMike Stump return Diag(TheCall->getArg(2)->getLocStart(), 1186fa25bbb351f4fdd977f51254119cdfc2b525ce90Chris Lattner diag::err_typecheck_call_too_many_args) 1187ccfa9639f8d09733bcf1c2572c5bd3daba5bd632Eric Christopher << 0 /*function call*/ << 2 << TheCall->getNumArgs() 1188fa25bbb351f4fdd977f51254119cdfc2b525ce90Chris Lattner << SourceRange(TheCall->getArg(2)->getLocStart(), 1189fa25bbb351f4fdd977f51254119cdfc2b525ce90Chris Lattner (*(TheCall->arg_end()-1))->getLocEnd()); 11901eb4433ac451dc16f4133a88af2d002ac26c58efMike Stump 1191429bb276991ff2dbc7c5b438828b9b7737cb15ebJohn Wiegley ExprResult OrigArg0 = TheCall->getArg(0); 1192429bb276991ff2dbc7c5b438828b9b7737cb15ebJohn Wiegley ExprResult OrigArg1 = TheCall->getArg(1); 1193cde01739dffe574c53a6ba1def1a57a2cc7b4a8bDouglas Gregor 11941b9a0793955070738cac6f04b5abe9496be9b317Chris Lattner // Do standard promotions between the two arguments, returning their common 11951b9a0793955070738cac6f04b5abe9496be9b317Chris Lattner // type. 1196925e60d3fa706f31886027c876989af79eb0e0d2Chris Lattner QualType Res = UsualArithmeticConversions(OrigArg0, OrigArg1, false); 1197429bb276991ff2dbc7c5b438828b9b7737cb15ebJohn Wiegley if (OrigArg0.isInvalid() || OrigArg1.isInvalid()) 1198429bb276991ff2dbc7c5b438828b9b7737cb15ebJohn Wiegley return true; 1199403bc2bd9edffe51d73776643fa87696c9417678Daniel Dunbar 1200403bc2bd9edffe51d73776643fa87696c9417678Daniel Dunbar // Make sure any conversions are pushed back into the call; this is 1201403bc2bd9edffe51d73776643fa87696c9417678Daniel Dunbar // type safe since unordered compare builtins are declared as "_Bool 1202403bc2bd9edffe51d73776643fa87696c9417678Daniel Dunbar // foo(...)". 1203429bb276991ff2dbc7c5b438828b9b7737cb15ebJohn Wiegley TheCall->setArg(0, OrigArg0.get()); 1204429bb276991ff2dbc7c5b438828b9b7737cb15ebJohn Wiegley TheCall->setArg(1, OrigArg1.get()); 12051eb4433ac451dc16f4133a88af2d002ac26c58efMike Stump 1206429bb276991ff2dbc7c5b438828b9b7737cb15ebJohn Wiegley if (OrigArg0.get()->isTypeDependent() || OrigArg1.get()->isTypeDependent()) 1207cde01739dffe574c53a6ba1def1a57a2cc7b4a8bDouglas Gregor return false; 1208cde01739dffe574c53a6ba1def1a57a2cc7b4a8bDouglas Gregor 12091b9a0793955070738cac6f04b5abe9496be9b317Chris Lattner // If the common type isn't a real floating type, then the arguments were 12101b9a0793955070738cac6f04b5abe9496be9b317Chris Lattner // invalid for this operation. 12111b9a0793955070738cac6f04b5abe9496be9b317Chris Lattner if (!Res->isRealFloatingType()) 1212429bb276991ff2dbc7c5b438828b9b7737cb15ebJohn Wiegley return Diag(OrigArg0.get()->getLocStart(), 1213fa25bbb351f4fdd977f51254119cdfc2b525ce90Chris Lattner diag::err_typecheck_call_invalid_ordered_compare) 1214429bb276991ff2dbc7c5b438828b9b7737cb15ebJohn Wiegley << OrigArg0.get()->getType() << OrigArg1.get()->getType() 1215429bb276991ff2dbc7c5b438828b9b7737cb15ebJohn Wiegley << SourceRange(OrigArg0.get()->getLocStart(), OrigArg1.get()->getLocEnd()); 12161eb4433ac451dc16f4133a88af2d002ac26c58efMike Stump 12171b9a0793955070738cac6f04b5abe9496be9b317Chris Lattner return false; 12181b9a0793955070738cac6f04b5abe9496be9b317Chris Lattner} 12191b9a0793955070738cac6f04b5abe9496be9b317Chris Lattner 1220e771a7ac11fb27f0e734e5de4d858f2c268895e5Benjamin Kramer/// SemaBuiltinSemaBuiltinFPClassification - Handle functions like 1221e771a7ac11fb27f0e734e5de4d858f2c268895e5Benjamin Kramer/// __builtin_isnan and friends. This is declared to take (...), so we have 12223b1e26b708e8d00d4ba10ff857201bae2aff6baeBenjamin Kramer/// to check everything. We expect the last argument to be a floating point 12233b1e26b708e8d00d4ba10ff857201bae2aff6baeBenjamin Kramer/// value. 12243b1e26b708e8d00d4ba10ff857201bae2aff6baeBenjamin Kramerbool Sema::SemaBuiltinFPClassification(CallExpr *TheCall, unsigned NumArgs) { 12253b1e26b708e8d00d4ba10ff857201bae2aff6baeBenjamin Kramer if (TheCall->getNumArgs() < NumArgs) 12269ac6f62a77be5b281a7ddc24a16669b457ac47c2Eli Friedman return Diag(TheCall->getLocEnd(), diag::err_typecheck_call_too_few_args) 1227d77b9a29651d748f0e30a8dad8969635fc04f725Eric Christopher << 0 << NumArgs << TheCall->getNumArgs()/*function call*/; 12283b1e26b708e8d00d4ba10ff857201bae2aff6baeBenjamin Kramer if (TheCall->getNumArgs() > NumArgs) 12293b1e26b708e8d00d4ba10ff857201bae2aff6baeBenjamin Kramer return Diag(TheCall->getArg(NumArgs)->getLocStart(), 12309ac6f62a77be5b281a7ddc24a16669b457ac47c2Eli Friedman diag::err_typecheck_call_too_many_args) 1231ccfa9639f8d09733bcf1c2572c5bd3daba5bd632Eric Christopher << 0 /*function call*/ << NumArgs << TheCall->getNumArgs() 12323b1e26b708e8d00d4ba10ff857201bae2aff6baeBenjamin Kramer << SourceRange(TheCall->getArg(NumArgs)->getLocStart(), 12339ac6f62a77be5b281a7ddc24a16669b457ac47c2Eli Friedman (*(TheCall->arg_end()-1))->getLocEnd()); 12349ac6f62a77be5b281a7ddc24a16669b457ac47c2Eli Friedman 12353b1e26b708e8d00d4ba10ff857201bae2aff6baeBenjamin Kramer Expr *OrigArg = TheCall->getArg(NumArgs-1); 12361eb4433ac451dc16f4133a88af2d002ac26c58efMike Stump 12379ac6f62a77be5b281a7ddc24a16669b457ac47c2Eli Friedman if (OrigArg->isTypeDependent()) 12389ac6f62a77be5b281a7ddc24a16669b457ac47c2Eli Friedman return false; 12399ac6f62a77be5b281a7ddc24a16669b457ac47c2Eli Friedman 124081368fbfd6d57150f66c993dc9041d62a7a32c4fChris Lattner // This operation requires a non-_Complex floating-point number. 12419ac6f62a77be5b281a7ddc24a16669b457ac47c2Eli Friedman if (!OrigArg->getType()->isRealFloatingType()) 12421eb4433ac451dc16f4133a88af2d002ac26c58efMike Stump return Diag(OrigArg->getLocStart(), 12439ac6f62a77be5b281a7ddc24a16669b457ac47c2Eli Friedman diag::err_typecheck_call_invalid_unary_fp) 12449ac6f62a77be5b281a7ddc24a16669b457ac47c2Eli Friedman << OrigArg->getType() << OrigArg->getSourceRange(); 12451eb4433ac451dc16f4133a88af2d002ac26c58efMike Stump 124681368fbfd6d57150f66c993dc9041d62a7a32c4fChris Lattner // If this is an implicit conversion from float -> double, remove it. 124781368fbfd6d57150f66c993dc9041d62a7a32c4fChris Lattner if (ImplicitCastExpr *Cast = dyn_cast<ImplicitCastExpr>(OrigArg)) { 124881368fbfd6d57150f66c993dc9041d62a7a32c4fChris Lattner Expr *CastArg = Cast->getSubExpr(); 124981368fbfd6d57150f66c993dc9041d62a7a32c4fChris Lattner if (CastArg->getType()->isSpecificBuiltinType(BuiltinType::Float)) { 125081368fbfd6d57150f66c993dc9041d62a7a32c4fChris Lattner assert(Cast->getType()->isSpecificBuiltinType(BuiltinType::Double) && 125181368fbfd6d57150f66c993dc9041d62a7a32c4fChris Lattner "promotion from float to double is the only expected cast here"); 125281368fbfd6d57150f66c993dc9041d62a7a32c4fChris Lattner Cast->setSubExpr(0); 125381368fbfd6d57150f66c993dc9041d62a7a32c4fChris Lattner TheCall->setArg(NumArgs-1, CastArg); 125481368fbfd6d57150f66c993dc9041d62a7a32c4fChris Lattner OrigArg = CastArg; 125581368fbfd6d57150f66c993dc9041d62a7a32c4fChris Lattner } 125681368fbfd6d57150f66c993dc9041d62a7a32c4fChris Lattner } 125781368fbfd6d57150f66c993dc9041d62a7a32c4fChris Lattner 12589ac6f62a77be5b281a7ddc24a16669b457ac47c2Eli Friedman return false; 12599ac6f62a77be5b281a7ddc24a16669b457ac47c2Eli Friedman} 12609ac6f62a77be5b281a7ddc24a16669b457ac47c2Eli Friedman 1261d38617c8a50f9729c254ab76cd359af797c6739bEli Friedman/// SemaBuiltinShuffleVector - Handle __builtin_shufflevector. 1262d38617c8a50f9729c254ab76cd359af797c6739bEli Friedman// This is declared to take (...), so we have to check everything. 126360d7b3a319d84d688752be3870615ac0f111fb16John McCallExprResult Sema::SemaBuiltinShuffleVector(CallExpr *TheCall) { 126437b6a5731a47f811d754f0d48aa93edf30e30513Nate Begeman if (TheCall->getNumArgs() < 2) 12650eb23307222bda7ad95d968eac4e1ab30864b213Sebastian Redl return ExprError(Diag(TheCall->getLocEnd(), 1266d77b9a29651d748f0e30a8dad8969635fc04f725Eric Christopher diag::err_typecheck_call_too_few_args_at_least) 126737b6a5731a47f811d754f0d48aa93edf30e30513Nate Begeman << 0 /*function call*/ << 2 << TheCall->getNumArgs() 1268d77b9a29651d748f0e30a8dad8969635fc04f725Eric Christopher << TheCall->getSourceRange()); 1269d38617c8a50f9729c254ab76cd359af797c6739bEli Friedman 127037b6a5731a47f811d754f0d48aa93edf30e30513Nate Begeman // Determine which of the following types of shufflevector we're checking: 127137b6a5731a47f811d754f0d48aa93edf30e30513Nate Begeman // 1) unary, vector mask: (lhs, mask) 127237b6a5731a47f811d754f0d48aa93edf30e30513Nate Begeman // 2) binary, vector mask: (lhs, rhs, mask) 127337b6a5731a47f811d754f0d48aa93edf30e30513Nate Begeman // 3) binary, scalar mask: (lhs, rhs, index, ..., index) 127437b6a5731a47f811d754f0d48aa93edf30e30513Nate Begeman QualType resType = TheCall->getArg(0)->getType(); 127537b6a5731a47f811d754f0d48aa93edf30e30513Nate Begeman unsigned numElements = 0; 127637b6a5731a47f811d754f0d48aa93edf30e30513Nate Begeman 1277cde01739dffe574c53a6ba1def1a57a2cc7b4a8bDouglas Gregor if (!TheCall->getArg(0)->isTypeDependent() && 1278cde01739dffe574c53a6ba1def1a57a2cc7b4a8bDouglas Gregor !TheCall->getArg(1)->isTypeDependent()) { 127937b6a5731a47f811d754f0d48aa93edf30e30513Nate Begeman QualType LHSType = TheCall->getArg(0)->getType(); 128037b6a5731a47f811d754f0d48aa93edf30e30513Nate Begeman QualType RHSType = TheCall->getArg(1)->getType(); 128137b6a5731a47f811d754f0d48aa93edf30e30513Nate Begeman 128237b6a5731a47f811d754f0d48aa93edf30e30513Nate Begeman if (!LHSType->isVectorType() || !RHSType->isVectorType()) { 1283cde01739dffe574c53a6ba1def1a57a2cc7b4a8bDouglas Gregor Diag(TheCall->getLocStart(), diag::err_shufflevector_non_vector) 12841eb4433ac451dc16f4133a88af2d002ac26c58efMike Stump << SourceRange(TheCall->getArg(0)->getLocStart(), 1285cde01739dffe574c53a6ba1def1a57a2cc7b4a8bDouglas Gregor TheCall->getArg(1)->getLocEnd()); 1286cde01739dffe574c53a6ba1def1a57a2cc7b4a8bDouglas Gregor return ExprError(); 1287cde01739dffe574c53a6ba1def1a57a2cc7b4a8bDouglas Gregor } 128837b6a5731a47f811d754f0d48aa93edf30e30513Nate Begeman 128937b6a5731a47f811d754f0d48aa93edf30e30513Nate Begeman numElements = LHSType->getAs<VectorType>()->getNumElements(); 129037b6a5731a47f811d754f0d48aa93edf30e30513Nate Begeman unsigned numResElements = TheCall->getNumArgs() - 2; 129137b6a5731a47f811d754f0d48aa93edf30e30513Nate Begeman 129237b6a5731a47f811d754f0d48aa93edf30e30513Nate Begeman // Check to see if we have a call with 2 vector arguments, the unary shuffle 129337b6a5731a47f811d754f0d48aa93edf30e30513Nate Begeman // with mask. If so, verify that RHS is an integer vector type with the 129437b6a5731a47f811d754f0d48aa93edf30e30513Nate Begeman // same number of elts as lhs. 129537b6a5731a47f811d754f0d48aa93edf30e30513Nate Begeman if (TheCall->getNumArgs() == 2) { 1296f60946222721d9ba3c059563935c17b84703187aDouglas Gregor if (!RHSType->hasIntegerRepresentation() || 129737b6a5731a47f811d754f0d48aa93edf30e30513Nate Begeman RHSType->getAs<VectorType>()->getNumElements() != numElements) 129837b6a5731a47f811d754f0d48aa93edf30e30513Nate Begeman Diag(TheCall->getLocStart(), diag::err_shufflevector_incompatible_vector) 129937b6a5731a47f811d754f0d48aa93edf30e30513Nate Begeman << SourceRange(TheCall->getArg(1)->getLocStart(), 130037b6a5731a47f811d754f0d48aa93edf30e30513Nate Begeman TheCall->getArg(1)->getLocEnd()); 130137b6a5731a47f811d754f0d48aa93edf30e30513Nate Begeman numResElements = numElements; 130237b6a5731a47f811d754f0d48aa93edf30e30513Nate Begeman } 130337b6a5731a47f811d754f0d48aa93edf30e30513Nate Begeman else if (!Context.hasSameUnqualifiedType(LHSType, RHSType)) { 1304cde01739dffe574c53a6ba1def1a57a2cc7b4a8bDouglas Gregor Diag(TheCall->getLocStart(), diag::err_shufflevector_incompatible_vector) 13051eb4433ac451dc16f4133a88af2d002ac26c58efMike Stump << SourceRange(TheCall->getArg(0)->getLocStart(), 1306cde01739dffe574c53a6ba1def1a57a2cc7b4a8bDouglas Gregor TheCall->getArg(1)->getLocEnd()); 1307cde01739dffe574c53a6ba1def1a57a2cc7b4a8bDouglas Gregor return ExprError(); 130837b6a5731a47f811d754f0d48aa93edf30e30513Nate Begeman } else if (numElements != numResElements) { 130937b6a5731a47f811d754f0d48aa93edf30e30513Nate Begeman QualType eltType = LHSType->getAs<VectorType>()->getElementType(); 1310788b0fd67e1992f23555454efcdb16a19dfefac3Chris Lattner resType = Context.getVectorType(eltType, numResElements, 1311e86d78cf4754a6aef2cf9a33d847aa15338e276fBob Wilson VectorType::GenericVector); 1312cde01739dffe574c53a6ba1def1a57a2cc7b4a8bDouglas Gregor } 1313d38617c8a50f9729c254ab76cd359af797c6739bEli Friedman } 1314d38617c8a50f9729c254ab76cd359af797c6739bEli Friedman 1315d38617c8a50f9729c254ab76cd359af797c6739bEli Friedman for (unsigned i = 2; i < TheCall->getNumArgs(); i++) { 1316cde01739dffe574c53a6ba1def1a57a2cc7b4a8bDouglas Gregor if (TheCall->getArg(i)->isTypeDependent() || 1317cde01739dffe574c53a6ba1def1a57a2cc7b4a8bDouglas Gregor TheCall->getArg(i)->isValueDependent()) 1318cde01739dffe574c53a6ba1def1a57a2cc7b4a8bDouglas Gregor continue; 1319cde01739dffe574c53a6ba1def1a57a2cc7b4a8bDouglas Gregor 132037b6a5731a47f811d754f0d48aa93edf30e30513Nate Begeman llvm::APSInt Result(32); 132137b6a5731a47f811d754f0d48aa93edf30e30513Nate Begeman if (!TheCall->getArg(i)->isIntegerConstantExpr(Result, Context)) 132237b6a5731a47f811d754f0d48aa93edf30e30513Nate Begeman return ExprError(Diag(TheCall->getLocStart(), 132337b6a5731a47f811d754f0d48aa93edf30e30513Nate Begeman diag::err_shufflevector_nonconstant_argument) 132437b6a5731a47f811d754f0d48aa93edf30e30513Nate Begeman << TheCall->getArg(i)->getSourceRange()); 13250eb23307222bda7ad95d968eac4e1ab30864b213Sebastian Redl 1326d1a0b6d3dfb208f638d3d750b588d9c0daa49289Chris Lattner if (Result.getActiveBits() > 64 || Result.getZExtValue() >= numElements*2) 13270eb23307222bda7ad95d968eac4e1ab30864b213Sebastian Redl return ExprError(Diag(TheCall->getLocStart(), 1328fa25bbb351f4fdd977f51254119cdfc2b525ce90Chris Lattner diag::err_shufflevector_argument_too_large) 13290eb23307222bda7ad95d968eac4e1ab30864b213Sebastian Redl << TheCall->getArg(i)->getSourceRange()); 1330d38617c8a50f9729c254ab76cd359af797c6739bEli Friedman } 1331d38617c8a50f9729c254ab76cd359af797c6739bEli Friedman 13325f9e272e632e951b1efe824cd16acb4d96077930Chris Lattner SmallVector<Expr*, 32> exprs; 1333d38617c8a50f9729c254ab76cd359af797c6739bEli Friedman 1334d1a0b6d3dfb208f638d3d750b588d9c0daa49289Chris Lattner for (unsigned i = 0, e = TheCall->getNumArgs(); i != e; i++) { 1335d38617c8a50f9729c254ab76cd359af797c6739bEli Friedman exprs.push_back(TheCall->getArg(i)); 1336d38617c8a50f9729c254ab76cd359af797c6739bEli Friedman TheCall->setArg(i, 0); 1337d38617c8a50f9729c254ab76cd359af797c6739bEli Friedman } 1338d38617c8a50f9729c254ab76cd359af797c6739bEli Friedman 1339a88dc3079bedf70a5cfc39791727e43a10383006Nate Begeman return Owned(new (Context) ShuffleVectorExpr(Context, exprs.begin(), 134037b6a5731a47f811d754f0d48aa93edf30e30513Nate Begeman exprs.size(), resType, 13418189cde56b4f6f938cd65f53c932fe1860d0204cTed Kremenek TheCall->getCallee()->getLocStart(), 13428189cde56b4f6f938cd65f53c932fe1860d0204cTed Kremenek TheCall->getRParenLoc())); 1343d38617c8a50f9729c254ab76cd359af797c6739bEli Friedman} 134430ce344307f8a8b00054021307015571f83c7364Chris Lattner 13454493f79fce48cd9cbd9f55fa9d452cde736747a0Daniel Dunbar/// SemaBuiltinPrefetch - Handle __builtin_prefetch. 13464493f79fce48cd9cbd9f55fa9d452cde736747a0Daniel Dunbar// This is declared to take (const void*, ...) and can take two 13474493f79fce48cd9cbd9f55fa9d452cde736747a0Daniel Dunbar// optional constant int args. 13484493f79fce48cd9cbd9f55fa9d452cde736747a0Daniel Dunbarbool Sema::SemaBuiltinPrefetch(CallExpr *TheCall) { 1349fa25bbb351f4fdd977f51254119cdfc2b525ce90Chris Lattner unsigned NumArgs = TheCall->getNumArgs(); 13504493f79fce48cd9cbd9f55fa9d452cde736747a0Daniel Dunbar 1351fa25bbb351f4fdd977f51254119cdfc2b525ce90Chris Lattner if (NumArgs > 3) 1352ccfa9639f8d09733bcf1c2572c5bd3daba5bd632Eric Christopher return Diag(TheCall->getLocEnd(), 1353ccfa9639f8d09733bcf1c2572c5bd3daba5bd632Eric Christopher diag::err_typecheck_call_too_many_args_at_most) 1354ccfa9639f8d09733bcf1c2572c5bd3daba5bd632Eric Christopher << 0 /*function call*/ << 3 << NumArgs 1355ccfa9639f8d09733bcf1c2572c5bd3daba5bd632Eric Christopher << TheCall->getSourceRange(); 13564493f79fce48cd9cbd9f55fa9d452cde736747a0Daniel Dunbar 13574493f79fce48cd9cbd9f55fa9d452cde736747a0Daniel Dunbar // Argument 0 is checked for us and the remaining arguments must be 13584493f79fce48cd9cbd9f55fa9d452cde736747a0Daniel Dunbar // constant integers. 1359fa25bbb351f4fdd977f51254119cdfc2b525ce90Chris Lattner for (unsigned i = 1; i != NumArgs; ++i) { 13604493f79fce48cd9cbd9f55fa9d452cde736747a0Daniel Dunbar Expr *Arg = TheCall->getArg(i); 1361691ebc3f3225542e5abd85e107ebdbec907cf510Eric Christopher 13629aef7263d84d9224575e113878cfbb06b8343cbfEli Friedman llvm::APSInt Result; 1363691ebc3f3225542e5abd85e107ebdbec907cf510Eric Christopher if (SemaBuiltinConstantArg(TheCall, i, Result)) 1364691ebc3f3225542e5abd85e107ebdbec907cf510Eric Christopher return true; 13651eb4433ac451dc16f4133a88af2d002ac26c58efMike Stump 13664493f79fce48cd9cbd9f55fa9d452cde736747a0Daniel Dunbar // FIXME: gcc issues a warning and rewrites these to 0. These 13674493f79fce48cd9cbd9f55fa9d452cde736747a0Daniel Dunbar // seems especially odd for the third argument since the default 13684493f79fce48cd9cbd9f55fa9d452cde736747a0Daniel Dunbar // is 3. 1369fa25bbb351f4fdd977f51254119cdfc2b525ce90Chris Lattner if (i == 1) { 13709aef7263d84d9224575e113878cfbb06b8343cbfEli Friedman if (Result.getLimitedValue() > 1) 1371fa25bbb351f4fdd977f51254119cdfc2b525ce90Chris Lattner return Diag(TheCall->getLocStart(), diag::err_argument_invalid_range) 137221fb98ee003e992b0c4e204d98a19e0ef544cae3Chris Lattner << "0" << "1" << Arg->getSourceRange(); 13734493f79fce48cd9cbd9f55fa9d452cde736747a0Daniel Dunbar } else { 13749aef7263d84d9224575e113878cfbb06b8343cbfEli Friedman if (Result.getLimitedValue() > 3) 1375fa25bbb351f4fdd977f51254119cdfc2b525ce90Chris Lattner return Diag(TheCall->getLocStart(), diag::err_argument_invalid_range) 137621fb98ee003e992b0c4e204d98a19e0ef544cae3Chris Lattner << "0" << "3" << Arg->getSourceRange(); 13774493f79fce48cd9cbd9f55fa9d452cde736747a0Daniel Dunbar } 13784493f79fce48cd9cbd9f55fa9d452cde736747a0Daniel Dunbar } 13794493f79fce48cd9cbd9f55fa9d452cde736747a0Daniel Dunbar 1380fa25bbb351f4fdd977f51254119cdfc2b525ce90Chris Lattner return false; 13814493f79fce48cd9cbd9f55fa9d452cde736747a0Daniel Dunbar} 13824493f79fce48cd9cbd9f55fa9d452cde736747a0Daniel Dunbar 1383691ebc3f3225542e5abd85e107ebdbec907cf510Eric Christopher/// SemaBuiltinConstantArg - Handle a check if argument ArgNum of CallExpr 1384691ebc3f3225542e5abd85e107ebdbec907cf510Eric Christopher/// TheCall is a constant expression. 1385691ebc3f3225542e5abd85e107ebdbec907cf510Eric Christopherbool Sema::SemaBuiltinConstantArg(CallExpr *TheCall, int ArgNum, 1386691ebc3f3225542e5abd85e107ebdbec907cf510Eric Christopher llvm::APSInt &Result) { 1387691ebc3f3225542e5abd85e107ebdbec907cf510Eric Christopher Expr *Arg = TheCall->getArg(ArgNum); 1388691ebc3f3225542e5abd85e107ebdbec907cf510Eric Christopher DeclRefExpr *DRE =cast<DeclRefExpr>(TheCall->getCallee()->IgnoreParenCasts()); 1389691ebc3f3225542e5abd85e107ebdbec907cf510Eric Christopher FunctionDecl *FDecl = cast<FunctionDecl>(DRE->getDecl()); 1390691ebc3f3225542e5abd85e107ebdbec907cf510Eric Christopher 1391691ebc3f3225542e5abd85e107ebdbec907cf510Eric Christopher if (Arg->isTypeDependent() || Arg->isValueDependent()) return false; 1392691ebc3f3225542e5abd85e107ebdbec907cf510Eric Christopher 1393691ebc3f3225542e5abd85e107ebdbec907cf510Eric Christopher if (!Arg->isIntegerConstantExpr(Result, Context)) 1394691ebc3f3225542e5abd85e107ebdbec907cf510Eric Christopher return Diag(TheCall->getLocStart(), diag::err_constant_integer_arg_type) 13955e8965525282a48fd34af05183b8c3705a5b00d5Eric Christopher << FDecl->getDeclName() << Arg->getSourceRange(); 1396691ebc3f3225542e5abd85e107ebdbec907cf510Eric Christopher 139721fb98ee003e992b0c4e204d98a19e0ef544cae3Chris Lattner return false; 139821fb98ee003e992b0c4e204d98a19e0ef544cae3Chris Lattner} 139921fb98ee003e992b0c4e204d98a19e0ef544cae3Chris Lattner 1400d5f8a4fd4d6dfb0415b93bb7ab721bba5cab1332Daniel Dunbar/// SemaBuiltinObjectSize - Handle __builtin_object_size(void *ptr, 1401d5f8a4fd4d6dfb0415b93bb7ab721bba5cab1332Daniel Dunbar/// int type). This simply type checks that type is one of the defined 1402d5f8a4fd4d6dfb0415b93bb7ab721bba5cab1332Daniel Dunbar/// constants (0-3). 1403fc8f0e14ad142ed811e90fbd9a30e419e301c717Chris Lattner// For compatibility check 0-3, llvm only handles 0 and 2. 1404d5f8a4fd4d6dfb0415b93bb7ab721bba5cab1332Daniel Dunbarbool Sema::SemaBuiltinObjectSize(CallExpr *TheCall) { 1405691ebc3f3225542e5abd85e107ebdbec907cf510Eric Christopher llvm::APSInt Result; 1406691ebc3f3225542e5abd85e107ebdbec907cf510Eric Christopher 1407691ebc3f3225542e5abd85e107ebdbec907cf510Eric Christopher // Check constant-ness first. 1408691ebc3f3225542e5abd85e107ebdbec907cf510Eric Christopher if (SemaBuiltinConstantArg(TheCall, 1, Result)) 1409691ebc3f3225542e5abd85e107ebdbec907cf510Eric Christopher return true; 1410d5f8a4fd4d6dfb0415b93bb7ab721bba5cab1332Daniel Dunbar 1411691ebc3f3225542e5abd85e107ebdbec907cf510Eric Christopher Expr *Arg = TheCall->getArg(1); 1412d5f8a4fd4d6dfb0415b93bb7ab721bba5cab1332Daniel Dunbar if (Result.getSExtValue() < 0 || Result.getSExtValue() > 3) { 1413fa25bbb351f4fdd977f51254119cdfc2b525ce90Chris Lattner return Diag(TheCall->getLocStart(), diag::err_argument_invalid_range) 1414fa25bbb351f4fdd977f51254119cdfc2b525ce90Chris Lattner << "0" << "3" << SourceRange(Arg->getLocStart(), Arg->getLocEnd()); 1415d5f8a4fd4d6dfb0415b93bb7ab721bba5cab1332Daniel Dunbar } 1416d5f8a4fd4d6dfb0415b93bb7ab721bba5cab1332Daniel Dunbar 1417d5f8a4fd4d6dfb0415b93bb7ab721bba5cab1332Daniel Dunbar return false; 1418d5f8a4fd4d6dfb0415b93bb7ab721bba5cab1332Daniel Dunbar} 1419d5f8a4fd4d6dfb0415b93bb7ab721bba5cab1332Daniel Dunbar 1420586d6a81428da2d1ce70bcb98df29d749361cbf3Eli Friedman/// SemaBuiltinLongjmp - Handle __builtin_longjmp(void *env[5], int val). 1421d875fed28578835de89cd407e9db4be788596d7cEli Friedman/// This checks that val is a constant 1. 1422d875fed28578835de89cd407e9db4be788596d7cEli Friedmanbool Sema::SemaBuiltinLongjmp(CallExpr *TheCall) { 1423d875fed28578835de89cd407e9db4be788596d7cEli Friedman Expr *Arg = TheCall->getArg(1); 1424691ebc3f3225542e5abd85e107ebdbec907cf510Eric Christopher llvm::APSInt Result; 1425cde01739dffe574c53a6ba1def1a57a2cc7b4a8bDouglas Gregor 1426691ebc3f3225542e5abd85e107ebdbec907cf510Eric Christopher // TODO: This is less than ideal. Overload this to take a value. 1427691ebc3f3225542e5abd85e107ebdbec907cf510Eric Christopher if (SemaBuiltinConstantArg(TheCall, 1, Result)) 1428691ebc3f3225542e5abd85e107ebdbec907cf510Eric Christopher return true; 1429691ebc3f3225542e5abd85e107ebdbec907cf510Eric Christopher 1430691ebc3f3225542e5abd85e107ebdbec907cf510Eric Christopher if (Result != 1) 1431d875fed28578835de89cd407e9db4be788596d7cEli Friedman return Diag(TheCall->getLocStart(), diag::err_builtin_longjmp_invalid_val) 1432d875fed28578835de89cd407e9db4be788596d7cEli Friedman << SourceRange(Arg->getLocStart(), Arg->getLocEnd()); 1433d875fed28578835de89cd407e9db4be788596d7cEli Friedman 1434d875fed28578835de89cd407e9db4be788596d7cEli Friedman return false; 1435d875fed28578835de89cd407e9db4be788596d7cEli Friedman} 1436d875fed28578835de89cd407e9db4be788596d7cEli Friedman 1437b43e8ad893706a2499c4901b8f5cb289553d66b1Ted Kremenek// Handle i > 1 ? "x" : "y", recursively. 1438082d936a5b8323ac2c04558d8bca277a647831a3Ted Kremenekbool Sema::SemaCheckStringLiteral(const Expr *E, const CallExpr *TheCall, 1439082d936a5b8323ac2c04558d8bca277a647831a3Ted Kremenek bool HasVAListArg, 1440826a3457f737f1fc45a22954fd1bfde38160c165Ted Kremenek unsigned format_idx, unsigned firstDataArg, 144155733de16f492dadbf5f4d2809d6c610ba6d86aeRichard Trieu bool isPrintf, bool inFunctionCall) { 14424fe6441a558e471f2ad3c6bddf07c77332539f6bTed Kremenek tryAgain: 1443cde01739dffe574c53a6ba1def1a57a2cc7b4a8bDouglas Gregor if (E->isTypeDependent() || E->isValueDependent()) 1444cde01739dffe574c53a6ba1def1a57a2cc7b4a8bDouglas Gregor return false; 1445d30ef87f34015d18bde20b9632032d0063d761aaTed Kremenek 1446f111d935722ed488144600cea5ed03a6b5069e8fPeter Collingbourne E = E->IgnoreParens(); 1447f111d935722ed488144600cea5ed03a6b5069e8fPeter Collingbourne 1448d30ef87f34015d18bde20b9632032d0063d761aaTed Kremenek switch (E->getStmtClass()) { 144956ca35d396d8692c384c785f9aeebcf22563fe1eJohn McCall case Stmt::BinaryConditionalOperatorClass: 1450d30ef87f34015d18bde20b9632032d0063d761aaTed Kremenek case Stmt::ConditionalOperatorClass: { 145156ca35d396d8692c384c785f9aeebcf22563fe1eJohn McCall const AbstractConditionalOperator *C = cast<AbstractConditionalOperator>(E); 1452826a3457f737f1fc45a22954fd1bfde38160c165Ted Kremenek return SemaCheckStringLiteral(C->getTrueExpr(), TheCall, HasVAListArg, 145355733de16f492dadbf5f4d2809d6c610ba6d86aeRichard Trieu format_idx, firstDataArg, isPrintf, 145455733de16f492dadbf5f4d2809d6c610ba6d86aeRichard Trieu inFunctionCall) 145556ca35d396d8692c384c785f9aeebcf22563fe1eJohn McCall && SemaCheckStringLiteral(C->getFalseExpr(), TheCall, HasVAListArg, 145655733de16f492dadbf5f4d2809d6c610ba6d86aeRichard Trieu format_idx, firstDataArg, isPrintf, 145755733de16f492dadbf5f4d2809d6c610ba6d86aeRichard Trieu inFunctionCall); 1458d30ef87f34015d18bde20b9632032d0063d761aaTed Kremenek } 1459d30ef87f34015d18bde20b9632032d0063d761aaTed Kremenek 146095355bb53ef3145e463b98c6fd26f8f95e26e26cTed Kremenek case Stmt::IntegerLiteralClass: 146195355bb53ef3145e463b98c6fd26f8f95e26e26cTed Kremenek // Technically -Wformat-nonliteral does not warn about this case. 146295355bb53ef3145e463b98c6fd26f8f95e26e26cTed Kremenek // The behavior of printf and friends in this case is implementation 146395355bb53ef3145e463b98c6fd26f8f95e26e26cTed Kremenek // dependent. Ideally if the format string cannot be null then 146495355bb53ef3145e463b98c6fd26f8f95e26e26cTed Kremenek // it should have a 'nonnull' attribute in the function prototype. 146595355bb53ef3145e463b98c6fd26f8f95e26e26cTed Kremenek return true; 146695355bb53ef3145e463b98c6fd26f8f95e26e26cTed Kremenek 1467d30ef87f34015d18bde20b9632032d0063d761aaTed Kremenek case Stmt::ImplicitCastExprClass: { 14684fe6441a558e471f2ad3c6bddf07c77332539f6bTed Kremenek E = cast<ImplicitCastExpr>(E)->getSubExpr(); 14694fe6441a558e471f2ad3c6bddf07c77332539f6bTed Kremenek goto tryAgain; 1470d30ef87f34015d18bde20b9632032d0063d761aaTed Kremenek } 1471d30ef87f34015d18bde20b9632032d0063d761aaTed Kremenek 147256ca35d396d8692c384c785f9aeebcf22563fe1eJohn McCall case Stmt::OpaqueValueExprClass: 147356ca35d396d8692c384c785f9aeebcf22563fe1eJohn McCall if (const Expr *src = cast<OpaqueValueExpr>(E)->getSourceExpr()) { 147456ca35d396d8692c384c785f9aeebcf22563fe1eJohn McCall E = src; 147556ca35d396d8692c384c785f9aeebcf22563fe1eJohn McCall goto tryAgain; 147656ca35d396d8692c384c785f9aeebcf22563fe1eJohn McCall } 147756ca35d396d8692c384c785f9aeebcf22563fe1eJohn McCall return false; 147856ca35d396d8692c384c785f9aeebcf22563fe1eJohn McCall 1479b43e8ad893706a2499c4901b8f5cb289553d66b1Ted Kremenek case Stmt::PredefinedExprClass: 1480b43e8ad893706a2499c4901b8f5cb289553d66b1Ted Kremenek // While __func__, etc., are technically not string literals, they 1481b43e8ad893706a2499c4901b8f5cb289553d66b1Ted Kremenek // cannot contain format specifiers and thus are not a security 1482b43e8ad893706a2499c4901b8f5cb289553d66b1Ted Kremenek // liability. 1483b43e8ad893706a2499c4901b8f5cb289553d66b1Ted Kremenek return true; 1484b43e8ad893706a2499c4901b8f5cb289553d66b1Ted Kremenek 1485082d936a5b8323ac2c04558d8bca277a647831a3Ted Kremenek case Stmt::DeclRefExprClass: { 1486082d936a5b8323ac2c04558d8bca277a647831a3Ted Kremenek const DeclRefExpr *DR = cast<DeclRefExpr>(E); 14871eb4433ac451dc16f4133a88af2d002ac26c58efMike Stump 1488082d936a5b8323ac2c04558d8bca277a647831a3Ted Kremenek // As an exception, do not flag errors for variables binding to 1489082d936a5b8323ac2c04558d8bca277a647831a3Ted Kremenek // const string literals. 1490082d936a5b8323ac2c04558d8bca277a647831a3Ted Kremenek if (const VarDecl *VD = dyn_cast<VarDecl>(DR->getDecl())) { 1491082d936a5b8323ac2c04558d8bca277a647831a3Ted Kremenek bool isConstant = false; 1492082d936a5b8323ac2c04558d8bca277a647831a3Ted Kremenek QualType T = DR->getType(); 1493082d936a5b8323ac2c04558d8bca277a647831a3Ted Kremenek 1494082d936a5b8323ac2c04558d8bca277a647831a3Ted Kremenek if (const ArrayType *AT = Context.getAsArrayType(T)) { 1495082d936a5b8323ac2c04558d8bca277a647831a3Ted Kremenek isConstant = AT->getElementType().isConstant(Context); 1496ac5fc7c6bcb494b60fee7ce615ac931c5db6135eMike Stump } else if (const PointerType *PT = T->getAs<PointerType>()) { 14971eb4433ac451dc16f4133a88af2d002ac26c58efMike Stump isConstant = T.isConstant(Context) && 1498082d936a5b8323ac2c04558d8bca277a647831a3Ted Kremenek PT->getPointeeType().isConstant(Context); 1499082d936a5b8323ac2c04558d8bca277a647831a3Ted Kremenek } 15001eb4433ac451dc16f4133a88af2d002ac26c58efMike Stump 1501082d936a5b8323ac2c04558d8bca277a647831a3Ted Kremenek if (isConstant) { 150231310a21fb2a9f13950f864f681c86080b05d5b2Sebastian Redl if (const Expr *Init = VD->getAnyInitializer()) 1503082d936a5b8323ac2c04558d8bca277a647831a3Ted Kremenek return SemaCheckStringLiteral(Init, TheCall, 1504826a3457f737f1fc45a22954fd1bfde38160c165Ted Kremenek HasVAListArg, format_idx, firstDataArg, 150555733de16f492dadbf5f4d2809d6c610ba6d86aeRichard Trieu isPrintf, /*inFunctionCall*/false); 1506082d936a5b8323ac2c04558d8bca277a647831a3Ted Kremenek } 15071eb4433ac451dc16f4133a88af2d002ac26c58efMike Stump 1508d966a55bccae13f34d18958877c5e71dd643a125Anders Carlsson // For vprintf* functions (i.e., HasVAListArg==true), we add a 1509d966a55bccae13f34d18958877c5e71dd643a125Anders Carlsson // special check to see if the format string is a function parameter 1510d966a55bccae13f34d18958877c5e71dd643a125Anders Carlsson // of the function calling the printf function. If the function 1511d966a55bccae13f34d18958877c5e71dd643a125Anders Carlsson // has an attribute indicating it is a printf-like function, then we 1512d966a55bccae13f34d18958877c5e71dd643a125Anders Carlsson // should suppress warnings concerning non-literals being used in a call 1513d966a55bccae13f34d18958877c5e71dd643a125Anders Carlsson // to a vprintf function. For example: 1514d966a55bccae13f34d18958877c5e71dd643a125Anders Carlsson // 1515d966a55bccae13f34d18958877c5e71dd643a125Anders Carlsson // void 1516d966a55bccae13f34d18958877c5e71dd643a125Anders Carlsson // logmessage(char const *fmt __attribute__ (format (printf, 1, 2)), ...){ 1517d966a55bccae13f34d18958877c5e71dd643a125Anders Carlsson // va_list ap; 1518d966a55bccae13f34d18958877c5e71dd643a125Anders Carlsson // va_start(ap, fmt); 1519d966a55bccae13f34d18958877c5e71dd643a125Anders Carlsson // vprintf(fmt, ap); // Do NOT emit a warning about "fmt". 1520d966a55bccae13f34d18958877c5e71dd643a125Anders Carlsson // ... 1521d966a55bccae13f34d18958877c5e71dd643a125Anders Carlsson // 1522d966a55bccae13f34d18958877c5e71dd643a125Anders Carlsson // 1523d966a55bccae13f34d18958877c5e71dd643a125Anders Carlsson // FIXME: We don't have full attribute support yet, so just check to see 1524d966a55bccae13f34d18958877c5e71dd643a125Anders Carlsson // if the argument is a DeclRefExpr that references a parameter. We'll 1525d966a55bccae13f34d18958877c5e71dd643a125Anders Carlsson // add proper support for checking the attribute later. 1526d966a55bccae13f34d18958877c5e71dd643a125Anders Carlsson if (HasVAListArg) 1527d966a55bccae13f34d18958877c5e71dd643a125Anders Carlsson if (isa<ParmVarDecl>(VD)) 1528d966a55bccae13f34d18958877c5e71dd643a125Anders Carlsson return true; 1529082d936a5b8323ac2c04558d8bca277a647831a3Ted Kremenek } 15301eb4433ac451dc16f4133a88af2d002ac26c58efMike Stump 1531082d936a5b8323ac2c04558d8bca277a647831a3Ted Kremenek return false; 1532082d936a5b8323ac2c04558d8bca277a647831a3Ted Kremenek } 1533d30ef87f34015d18bde20b9632032d0063d761aaTed Kremenek 15348f031b3b14e726b093fb8693c2be4ab6d779e331Anders Carlsson case Stmt::CallExprClass: { 15358f031b3b14e726b093fb8693c2be4ab6d779e331Anders Carlsson const CallExpr *CE = cast<CallExpr>(E); 15361eb4433ac451dc16f4133a88af2d002ac26c58efMike Stump if (const ImplicitCastExpr *ICE 15378f031b3b14e726b093fb8693c2be4ab6d779e331Anders Carlsson = dyn_cast<ImplicitCastExpr>(CE->getCallee())) { 15388f031b3b14e726b093fb8693c2be4ab6d779e331Anders Carlsson if (const DeclRefExpr *DRE = dyn_cast<DeclRefExpr>(ICE->getSubExpr())) { 15398f031b3b14e726b093fb8693c2be4ab6d779e331Anders Carlsson if (const FunctionDecl *FD = dyn_cast<FunctionDecl>(DRE->getDecl())) { 154040b598eea1310ec9ed554d56ce3e25b34c585458Argyrios Kyrtzidis if (const FormatArgAttr *FA = FD->getAttr<FormatArgAttr>()) { 15418f031b3b14e726b093fb8693c2be4ab6d779e331Anders Carlsson unsigned ArgIndex = FA->getFormatIdx(); 15428f031b3b14e726b093fb8693c2be4ab6d779e331Anders Carlsson const Expr *Arg = CE->getArg(ArgIndex - 1); 15431eb4433ac451dc16f4133a88af2d002ac26c58efMike Stump 15441eb4433ac451dc16f4133a88af2d002ac26c58efMike Stump return SemaCheckStringLiteral(Arg, TheCall, HasVAListArg, 154555733de16f492dadbf5f4d2809d6c610ba6d86aeRichard Trieu format_idx, firstDataArg, isPrintf, 154655733de16f492dadbf5f4d2809d6c610ba6d86aeRichard Trieu inFunctionCall); 15478f031b3b14e726b093fb8693c2be4ab6d779e331Anders Carlsson } 15488f031b3b14e726b093fb8693c2be4ab6d779e331Anders Carlsson } 15498f031b3b14e726b093fb8693c2be4ab6d779e331Anders Carlsson } 15508f031b3b14e726b093fb8693c2be4ab6d779e331Anders Carlsson } 15511eb4433ac451dc16f4133a88af2d002ac26c58efMike Stump 15528f031b3b14e726b093fb8693c2be4ab6d779e331Anders Carlsson return false; 15538f031b3b14e726b093fb8693c2be4ab6d779e331Anders Carlsson } 1554082d936a5b8323ac2c04558d8bca277a647831a3Ted Kremenek case Stmt::ObjCStringLiteralClass: 1555082d936a5b8323ac2c04558d8bca277a647831a3Ted Kremenek case Stmt::StringLiteralClass: { 1556082d936a5b8323ac2c04558d8bca277a647831a3Ted Kremenek const StringLiteral *StrE = NULL; 15571eb4433ac451dc16f4133a88af2d002ac26c58efMike Stump 1558082d936a5b8323ac2c04558d8bca277a647831a3Ted Kremenek if (const ObjCStringLiteral *ObjCFExpr = dyn_cast<ObjCStringLiteral>(E)) 1559d30ef87f34015d18bde20b9632032d0063d761aaTed Kremenek StrE = ObjCFExpr->getString(); 1560d30ef87f34015d18bde20b9632032d0063d761aaTed Kremenek else 1561082d936a5b8323ac2c04558d8bca277a647831a3Ted Kremenek StrE = cast<StringLiteral>(E); 15621eb4433ac451dc16f4133a88af2d002ac26c58efMike Stump 1563d30ef87f34015d18bde20b9632032d0063d761aaTed Kremenek if (StrE) { 1564826a3457f737f1fc45a22954fd1bfde38160c165Ted Kremenek CheckFormatString(StrE, E, TheCall, HasVAListArg, format_idx, 156555733de16f492dadbf5f4d2809d6c610ba6d86aeRichard Trieu firstDataArg, isPrintf, inFunctionCall); 1566d30ef87f34015d18bde20b9632032d0063d761aaTed Kremenek return true; 1567d30ef87f34015d18bde20b9632032d0063d761aaTed Kremenek } 15681eb4433ac451dc16f4133a88af2d002ac26c58efMike Stump 1569d30ef87f34015d18bde20b9632032d0063d761aaTed Kremenek return false; 1570d30ef87f34015d18bde20b9632032d0063d761aaTed Kremenek } 15711eb4433ac451dc16f4133a88af2d002ac26c58efMike Stump 1572082d936a5b8323ac2c04558d8bca277a647831a3Ted Kremenek default: 1573082d936a5b8323ac2c04558d8bca277a647831a3Ted Kremenek return false; 1574d30ef87f34015d18bde20b9632032d0063d761aaTed Kremenek } 1575d30ef87f34015d18bde20b9632032d0063d761aaTed Kremenek} 1576d30ef87f34015d18bde20b9632032d0063d761aaTed Kremenek 1577e898f8a94947c6074d76ff83943b47d5bbdf210dFariborz Jahanianvoid 15781eb4433ac451dc16f4133a88af2d002ac26c58efMike StumpSema::CheckNonNullArguments(const NonNullAttr *NonNull, 1579909a70d8a185f701c20bacc3c76f8f5979cbbc7cNick Lewycky const Expr * const *ExprArgs, 1580909a70d8a185f701c20bacc3c76f8f5979cbbc7cNick Lewycky SourceLocation CallSiteLoc) { 1581cf807c4dfdb23e8fa3f400e0b24ef5b79db7a530Sean Hunt for (NonNullAttr::args_iterator i = NonNull->args_begin(), 1582cf807c4dfdb23e8fa3f400e0b24ef5b79db7a530Sean Hunt e = NonNull->args_end(); 1583e898f8a94947c6074d76ff83943b47d5bbdf210dFariborz Jahanian i != e; ++i) { 1584909a70d8a185f701c20bacc3c76f8f5979cbbc7cNick Lewycky const Expr *ArgExpr = ExprArgs[*i]; 15854e4b30ec62d78b24e6556fea2624855c193d0e3eTed Kremenek if (ArgExpr->isNullPointerConstant(Context, 1586ce94049b69f75b44c18584fe79cd238978b6b0d5Douglas Gregor Expr::NPC_ValueDependentIsNotNull)) 1587909a70d8a185f701c20bacc3c76f8f5979cbbc7cNick Lewycky Diag(CallSiteLoc, diag::warn_null_arg) << ArgExpr->getSourceRange(); 1588e898f8a94947c6074d76ff83943b47d5bbdf210dFariborz Jahanian } 1589e898f8a94947c6074d76ff83943b47d5bbdf210dFariborz Jahanian} 1590d30ef87f34015d18bde20b9632032d0063d761aaTed Kremenek 1591826a3457f737f1fc45a22954fd1bfde38160c165Ted Kremenek/// CheckPrintfScanfArguments - Check calls to printf and scanf (and similar 1592826a3457f737f1fc45a22954fd1bfde38160c165Ted Kremenek/// functions) for correct use of format strings. 159359907c4d8f6fc8aacfdaa0273bd7a9c140fbb45fChris Lattnervoid 1594826a3457f737f1fc45a22954fd1bfde38160c165Ted KremenekSema::CheckPrintfScanfArguments(const CallExpr *TheCall, bool HasVAListArg, 1595826a3457f737f1fc45a22954fd1bfde38160c165Ted Kremenek unsigned format_idx, unsigned firstDataArg, 1596826a3457f737f1fc45a22954fd1bfde38160c165Ted Kremenek bool isPrintf) { 1597826a3457f737f1fc45a22954fd1bfde38160c165Ted Kremenek 1598082d936a5b8323ac2c04558d8bca277a647831a3Ted Kremenek const Expr *Fn = TheCall->getCallee(); 1599925e60d3fa706f31886027c876989af79eb0e0d2Chris Lattner 16004a2614e94672c47395abcde60518776fbebec589Sebastian Redl // The way the format attribute works in GCC, the implicit this argument 16014a2614e94672c47395abcde60518776fbebec589Sebastian Redl // of member functions is counted. However, it doesn't appear in our own 16024a2614e94672c47395abcde60518776fbebec589Sebastian Redl // lists, so decrement format_idx in that case. 16034a2614e94672c47395abcde60518776fbebec589Sebastian Redl if (isa<CXXMemberCallExpr>(TheCall)) { 16049263a3060087eb7b5954ec4ee1ff2c22227b422eChandler Carruth const CXXMethodDecl *method_decl = 16059263a3060087eb7b5954ec4ee1ff2c22227b422eChandler Carruth dyn_cast<CXXMethodDecl>(TheCall->getCalleeDecl()); 16069263a3060087eb7b5954ec4ee1ff2c22227b422eChandler Carruth if (method_decl && method_decl->isInstance()) { 16079263a3060087eb7b5954ec4ee1ff2c22227b422eChandler Carruth // Catch a format attribute mistakenly referring to the object argument. 16089263a3060087eb7b5954ec4ee1ff2c22227b422eChandler Carruth if (format_idx == 0) 16099263a3060087eb7b5954ec4ee1ff2c22227b422eChandler Carruth return; 16109263a3060087eb7b5954ec4ee1ff2c22227b422eChandler Carruth --format_idx; 16119263a3060087eb7b5954ec4ee1ff2c22227b422eChandler Carruth if(firstDataArg != 0) 16129263a3060087eb7b5954ec4ee1ff2c22227b422eChandler Carruth --firstDataArg; 16139263a3060087eb7b5954ec4ee1ff2c22227b422eChandler Carruth } 16144a2614e94672c47395abcde60518776fbebec589Sebastian Redl } 16154a2614e94672c47395abcde60518776fbebec589Sebastian Redl 1616826a3457f737f1fc45a22954fd1bfde38160c165Ted Kremenek // CHECK: printf/scanf-like function is called with no format string. 1617925e60d3fa706f31886027c876989af79eb0e0d2Chris Lattner if (format_idx >= TheCall->getNumArgs()) { 1618826a3457f737f1fc45a22954fd1bfde38160c165Ted Kremenek Diag(TheCall->getRParenLoc(), diag::warn_missing_format_string) 1619dcd5ef12488e4c7ea844327835896ca86b609a97Chris Lattner << Fn->getSourceRange(); 162071895b9aa3ad71957359497e136b50fcb6136bdfTed Kremenek return; 162171895b9aa3ad71957359497e136b50fcb6136bdfTed Kremenek } 16221eb4433ac451dc16f4133a88af2d002ac26c58efMike Stump 1623082d936a5b8323ac2c04558d8bca277a647831a3Ted Kremenek const Expr *OrigFormatExpr = TheCall->getArg(format_idx)->IgnoreParenCasts(); 16241eb4433ac451dc16f4133a88af2d002ac26c58efMike Stump 162559907c4d8f6fc8aacfdaa0273bd7a9c140fbb45fChris Lattner // CHECK: format string is not a string literal. 16261eb4433ac451dc16f4133a88af2d002ac26c58efMike Stump // 162771895b9aa3ad71957359497e136b50fcb6136bdfTed Kremenek // Dynamically generated format strings are difficult to 162871895b9aa3ad71957359497e136b50fcb6136bdfTed Kremenek // automatically vet at compile time. Requiring that format strings 162971895b9aa3ad71957359497e136b50fcb6136bdfTed Kremenek // are string literals: (1) permits the checking of format strings by 163071895b9aa3ad71957359497e136b50fcb6136bdfTed Kremenek // the compiler and thereby (2) can practically remove the source of 163171895b9aa3ad71957359497e136b50fcb6136bdfTed Kremenek // many format string exploits. 16327ff22b259d4d4729f701679e3a7f0e242365e07fTed Kremenek 16331eb4433ac451dc16f4133a88af2d002ac26c58efMike Stump // Format string can be either ObjC string (e.g. @"%d") or 16347ff22b259d4d4729f701679e3a7f0e242365e07fTed Kremenek // C string (e.g. "%d") 16351eb4433ac451dc16f4133a88af2d002ac26c58efMike Stump // ObjC string uses the same format specifiers as C string, so we can use 16367ff22b259d4d4729f701679e3a7f0e242365e07fTed Kremenek // the same format string checking logic for both ObjC and C strings. 16371cd3e1f72c3a1c256fb6a5c3d4512bca1f1b751dChris Lattner if (SemaCheckStringLiteral(OrigFormatExpr, TheCall, HasVAListArg, format_idx, 1638826a3457f737f1fc45a22954fd1bfde38160c165Ted Kremenek firstDataArg, isPrintf)) 16391cd3e1f72c3a1c256fb6a5c3d4512bca1f1b751dChris Lattner return; // Literal format string found, check done! 16401cd3e1f72c3a1c256fb6a5c3d4512bca1f1b751dChris Lattner 1641655f141f4d4c92eeebcc880211313e84c0a8b2f2Chris Lattner // If there are no arguments specified, warn with -Wformat-security, otherwise 1642655f141f4d4c92eeebcc880211313e84c0a8b2f2Chris Lattner // warn only with -Wformat-nonliteral. 1643655f141f4d4c92eeebcc880211313e84c0a8b2f2Chris Lattner if (TheCall->getNumArgs() == format_idx+1) 16441eb4433ac451dc16f4133a88af2d002ac26c58efMike Stump Diag(TheCall->getArg(format_idx)->getLocStart(), 1645826a3457f737f1fc45a22954fd1bfde38160c165Ted Kremenek diag::warn_format_nonliteral_noargs) 1646655f141f4d4c92eeebcc880211313e84c0a8b2f2Chris Lattner << OrigFormatExpr->getSourceRange(); 1647655f141f4d4c92eeebcc880211313e84c0a8b2f2Chris Lattner else 16481eb4433ac451dc16f4133a88af2d002ac26c58efMike Stump Diag(TheCall->getArg(format_idx)->getLocStart(), 1649826a3457f737f1fc45a22954fd1bfde38160c165Ted Kremenek diag::warn_format_nonliteral) 1650655f141f4d4c92eeebcc880211313e84c0a8b2f2Chris Lattner << OrigFormatExpr->getSourceRange(); 1651d30ef87f34015d18bde20b9632032d0063d761aaTed Kremenek} 1652d30ef87f34015d18bde20b9632032d0063d761aaTed Kremenek 1653e0e5313c25f3870d0d18fc67e1b3a3a0e1ef8e07Ted Kremeneknamespace { 1654826a3457f737f1fc45a22954fd1bfde38160c165Ted Kremenekclass CheckFormatHandler : public analyze_format_string::FormatStringHandler { 1655826a3457f737f1fc45a22954fd1bfde38160c165Ted Kremenekprotected: 1656e0e5313c25f3870d0d18fc67e1b3a3a0e1ef8e07Ted Kremenek Sema &S; 1657e0e5313c25f3870d0d18fc67e1b3a3a0e1ef8e07Ted Kremenek const StringLiteral *FExpr; 1658e0e5313c25f3870d0d18fc67e1b3a3a0e1ef8e07Ted Kremenek const Expr *OrigFormatExpr; 16596ee765348b2855c702fa593fb030ef6abe0d01f6Ted Kremenek const unsigned FirstDataArg; 1660e0e5313c25f3870d0d18fc67e1b3a3a0e1ef8e07Ted Kremenek const unsigned NumDataArgs; 1661e0e5313c25f3870d0d18fc67e1b3a3a0e1ef8e07Ted Kremenek const bool IsObjCLiteral; 1662e0e5313c25f3870d0d18fc67e1b3a3a0e1ef8e07Ted Kremenek const char *Beg; // Start of format string. 16630d27735c51f5bd392e673cf39a675e14e9442387Ted Kremenek const bool HasVAListArg; 16640d27735c51f5bd392e673cf39a675e14e9442387Ted Kremenek const CallExpr *TheCall; 16650d27735c51f5bd392e673cf39a675e14e9442387Ted Kremenek unsigned FormatIdx; 16667f70dc85d5055c19c8003f43a59135de211ad1b9Ted Kremenek llvm::BitVector CoveredArgs; 1667efaff195ba1fa55b6fe0b0b2435b81451387d241Ted Kremenek bool usesPositionalArgs; 1668efaff195ba1fa55b6fe0b0b2435b81451387d241Ted Kremenek bool atFirstArg; 166955733de16f492dadbf5f4d2809d6c610ba6d86aeRichard Trieu bool inFunctionCall; 16704e4b30ec62d78b24e6556fea2624855c193d0e3eTed Kremenekpublic: 1671826a3457f737f1fc45a22954fd1bfde38160c165Ted Kremenek CheckFormatHandler(Sema &s, const StringLiteral *fexpr, 16726ee765348b2855c702fa593fb030ef6abe0d01f6Ted Kremenek const Expr *origFormatExpr, unsigned firstDataArg, 1673e0e5313c25f3870d0d18fc67e1b3a3a0e1ef8e07Ted Kremenek unsigned numDataArgs, bool isObjCLiteral, 16740d27735c51f5bd392e673cf39a675e14e9442387Ted Kremenek const char *beg, bool hasVAListArg, 167555733de16f492dadbf5f4d2809d6c610ba6d86aeRichard Trieu const CallExpr *theCall, unsigned formatIdx, 167655733de16f492dadbf5f4d2809d6c610ba6d86aeRichard Trieu bool inFunctionCall) 1677e0e5313c25f3870d0d18fc67e1b3a3a0e1ef8e07Ted Kremenek : S(s), FExpr(fexpr), OrigFormatExpr(origFormatExpr), 16786ee765348b2855c702fa593fb030ef6abe0d01f6Ted Kremenek FirstDataArg(firstDataArg), 16797f70dc85d5055c19c8003f43a59135de211ad1b9Ted Kremenek NumDataArgs(numDataArgs), 16800d27735c51f5bd392e673cf39a675e14e9442387Ted Kremenek IsObjCLiteral(isObjCLiteral), Beg(beg), 16810d27735c51f5bd392e673cf39a675e14e9442387Ted Kremenek HasVAListArg(hasVAListArg), 1682efaff195ba1fa55b6fe0b0b2435b81451387d241Ted Kremenek TheCall(theCall), FormatIdx(formatIdx), 168355733de16f492dadbf5f4d2809d6c610ba6d86aeRichard Trieu usesPositionalArgs(false), atFirstArg(true), 168455733de16f492dadbf5f4d2809d6c610ba6d86aeRichard Trieu inFunctionCall(inFunctionCall) { 16857f70dc85d5055c19c8003f43a59135de211ad1b9Ted Kremenek CoveredArgs.resize(numDataArgs); 16867f70dc85d5055c19c8003f43a59135de211ad1b9Ted Kremenek CoveredArgs.reset(); 16877f70dc85d5055c19c8003f43a59135de211ad1b9Ted Kremenek } 16884e4b30ec62d78b24e6556fea2624855c193d0e3eTed Kremenek 168907d161f38e708a91486bf1c031d525faebbb249dTed Kremenek void DoneProcessing(); 16904e4b30ec62d78b24e6556fea2624855c193d0e3eTed Kremenek 1691826a3457f737f1fc45a22954fd1bfde38160c165Ted Kremenek void HandleIncompleteSpecifier(const char *startSpecifier, 1692826a3457f737f1fc45a22954fd1bfde38160c165Ted Kremenek unsigned specifierLen); 1693826a3457f737f1fc45a22954fd1bfde38160c165Ted Kremenek 1694efaff195ba1fa55b6fe0b0b2435b81451387d241Ted Kremenek virtual void HandleInvalidPosition(const char *startSpecifier, 1695efaff195ba1fa55b6fe0b0b2435b81451387d241Ted Kremenek unsigned specifierLen, 1696826a3457f737f1fc45a22954fd1bfde38160c165Ted Kremenek analyze_format_string::PositionContext p); 1697efaff195ba1fa55b6fe0b0b2435b81451387d241Ted Kremenek 1698efaff195ba1fa55b6fe0b0b2435b81451387d241Ted Kremenek virtual void HandleZeroPosition(const char *startPos, unsigned posLen); 1699efaff195ba1fa55b6fe0b0b2435b81451387d241Ted Kremenek 1700e0e5313c25f3870d0d18fc67e1b3a3a0e1ef8e07Ted Kremenek void HandleNullChar(const char *nullCharacter); 17014e4b30ec62d78b24e6556fea2624855c193d0e3eTed Kremenek 170255733de16f492dadbf5f4d2809d6c610ba6d86aeRichard Trieu template <typename Range> 170355733de16f492dadbf5f4d2809d6c610ba6d86aeRichard Trieu static void EmitFormatDiagnostic(Sema &S, bool inFunctionCall, 170455733de16f492dadbf5f4d2809d6c610ba6d86aeRichard Trieu const Expr *ArgumentExpr, 170555733de16f492dadbf5f4d2809d6c610ba6d86aeRichard Trieu PartialDiagnostic PDiag, 170655733de16f492dadbf5f4d2809d6c610ba6d86aeRichard Trieu SourceLocation StringLoc, 170755733de16f492dadbf5f4d2809d6c610ba6d86aeRichard Trieu bool IsStringLocation, Range StringRange, 170855733de16f492dadbf5f4d2809d6c610ba6d86aeRichard Trieu FixItHint Fixit = FixItHint()); 170955733de16f492dadbf5f4d2809d6c610ba6d86aeRichard Trieu 1710826a3457f737f1fc45a22954fd1bfde38160c165Ted Kremenekprotected: 1711c09b6a59e02ae265fce51b8c11e2a045bcdaa888Ted Kremenek bool HandleInvalidConversionSpecifier(unsigned argIndex, SourceLocation Loc, 1712c09b6a59e02ae265fce51b8c11e2a045bcdaa888Ted Kremenek const char *startSpec, 1713c09b6a59e02ae265fce51b8c11e2a045bcdaa888Ted Kremenek unsigned specifierLen, 1714c09b6a59e02ae265fce51b8c11e2a045bcdaa888Ted Kremenek const char *csStart, unsigned csLen); 171555733de16f492dadbf5f4d2809d6c610ba6d86aeRichard Trieu 171655733de16f492dadbf5f4d2809d6c610ba6d86aeRichard Trieu void HandlePositionalNonpositionalArgs(SourceLocation Loc, 171755733de16f492dadbf5f4d2809d6c610ba6d86aeRichard Trieu const char *startSpec, 171855733de16f492dadbf5f4d2809d6c610ba6d86aeRichard Trieu unsigned specifierLen); 1719c09b6a59e02ae265fce51b8c11e2a045bcdaa888Ted Kremenek 1720f88c8e02da48afea6a04091f675af5c4facd99f1Ted Kremenek SourceRange getFormatStringRange(); 1721826a3457f737f1fc45a22954fd1bfde38160c165Ted Kremenek CharSourceRange getSpecifierRange(const char *startSpecifier, 1722826a3457f737f1fc45a22954fd1bfde38160c165Ted Kremenek unsigned specifierLen); 1723e0e5313c25f3870d0d18fc67e1b3a3a0e1ef8e07Ted Kremenek SourceLocation getLocationOfByte(const char *x); 17244e4b30ec62d78b24e6556fea2624855c193d0e3eTed Kremenek 17250d27735c51f5bd392e673cf39a675e14e9442387Ted Kremenek const Expr *getDataArg(unsigned i) const; 1726666a197deb75d95c78ddd39274af1a54240828d8Ted Kremenek 1727666a197deb75d95c78ddd39274af1a54240828d8Ted Kremenek bool CheckNumArgs(const analyze_format_string::FormatSpecifier &FS, 1728666a197deb75d95c78ddd39274af1a54240828d8Ted Kremenek const analyze_format_string::ConversionSpecifier &CS, 1729666a197deb75d95c78ddd39274af1a54240828d8Ted Kremenek const char *startSpecifier, unsigned specifierLen, 1730666a197deb75d95c78ddd39274af1a54240828d8Ted Kremenek unsigned argIndex); 173155733de16f492dadbf5f4d2809d6c610ba6d86aeRichard Trieu 173255733de16f492dadbf5f4d2809d6c610ba6d86aeRichard Trieu template <typename Range> 173355733de16f492dadbf5f4d2809d6c610ba6d86aeRichard Trieu void EmitFormatDiagnostic(PartialDiagnostic PDiag, SourceLocation StringLoc, 173455733de16f492dadbf5f4d2809d6c610ba6d86aeRichard Trieu bool IsStringLocation, Range StringRange, 173555733de16f492dadbf5f4d2809d6c610ba6d86aeRichard Trieu FixItHint Fixit = FixItHint()); 173655733de16f492dadbf5f4d2809d6c610ba6d86aeRichard Trieu 173755733de16f492dadbf5f4d2809d6c610ba6d86aeRichard Trieu void CheckPositionalAndNonpositionalArgs( 173855733de16f492dadbf5f4d2809d6c610ba6d86aeRichard Trieu const analyze_format_string::FormatSpecifier *FS); 1739e0e5313c25f3870d0d18fc67e1b3a3a0e1ef8e07Ted Kremenek}; 1740e0e5313c25f3870d0d18fc67e1b3a3a0e1ef8e07Ted Kremenek} 1741e0e5313c25f3870d0d18fc67e1b3a3a0e1ef8e07Ted Kremenek 1742826a3457f737f1fc45a22954fd1bfde38160c165Ted KremenekSourceRange CheckFormatHandler::getFormatStringRange() { 1743e0e5313c25f3870d0d18fc67e1b3a3a0e1ef8e07Ted Kremenek return OrigFormatExpr->getSourceRange(); 1744e0e5313c25f3870d0d18fc67e1b3a3a0e1ef8e07Ted Kremenek} 1745e0e5313c25f3870d0d18fc67e1b3a3a0e1ef8e07Ted Kremenek 1746826a3457f737f1fc45a22954fd1bfde38160c165Ted KremenekCharSourceRange CheckFormatHandler:: 1747826a3457f737f1fc45a22954fd1bfde38160c165Ted KremenekgetSpecifierRange(const char *startSpecifier, unsigned specifierLen) { 174845f9b7e8f23072d662ee1cc758f4ecb0da5e3322Tom Care SourceLocation Start = getLocationOfByte(startSpecifier); 174945f9b7e8f23072d662ee1cc758f4ecb0da5e3322Tom Care SourceLocation End = getLocationOfByte(startSpecifier + specifierLen - 1); 175045f9b7e8f23072d662ee1cc758f4ecb0da5e3322Tom Care 175145f9b7e8f23072d662ee1cc758f4ecb0da5e3322Tom Care // Advance the end SourceLocation by one due to half-open ranges. 1752a64ccefdf0ea4e03ec88805d71b0af74950c7472Argyrios Kyrtzidis End = End.getLocWithOffset(1); 175345f9b7e8f23072d662ee1cc758f4ecb0da5e3322Tom Care 175445f9b7e8f23072d662ee1cc758f4ecb0da5e3322Tom Care return CharSourceRange::getCharRange(Start, End); 1755f88c8e02da48afea6a04091f675af5c4facd99f1Ted Kremenek} 1756f88c8e02da48afea6a04091f675af5c4facd99f1Ted Kremenek 1757826a3457f737f1fc45a22954fd1bfde38160c165Ted KremenekSourceLocation CheckFormatHandler::getLocationOfByte(const char *x) { 17584e4b30ec62d78b24e6556fea2624855c193d0e3eTed Kremenek return S.getLocationOfStringLiteralByte(FExpr, x - Beg); 1759e0e5313c25f3870d0d18fc67e1b3a3a0e1ef8e07Ted Kremenek} 1760e0e5313c25f3870d0d18fc67e1b3a3a0e1ef8e07Ted Kremenek 1761826a3457f737f1fc45a22954fd1bfde38160c165Ted Kremenekvoid CheckFormatHandler::HandleIncompleteSpecifier(const char *startSpecifier, 1762826a3457f737f1fc45a22954fd1bfde38160c165Ted Kremenek unsigned specifierLen){ 176355733de16f492dadbf5f4d2809d6c610ba6d86aeRichard Trieu EmitFormatDiagnostic(S.PDiag(diag::warn_printf_incomplete_specifier), 176455733de16f492dadbf5f4d2809d6c610ba6d86aeRichard Trieu getLocationOfByte(startSpecifier), 176555733de16f492dadbf5f4d2809d6c610ba6d86aeRichard Trieu /*IsStringLocation*/true, 176655733de16f492dadbf5f4d2809d6c610ba6d86aeRichard Trieu getSpecifierRange(startSpecifier, specifierLen)); 1767808015a18bd97781ce437831a95a92fdfc8d5136Ted Kremenek} 1768808015a18bd97781ce437831a95a92fdfc8d5136Ted Kremenek 1769efaff195ba1fa55b6fe0b0b2435b81451387d241Ted Kremenekvoid 1770826a3457f737f1fc45a22954fd1bfde38160c165Ted KremenekCheckFormatHandler::HandleInvalidPosition(const char *startPos, unsigned posLen, 1771826a3457f737f1fc45a22954fd1bfde38160c165Ted Kremenek analyze_format_string::PositionContext p) { 177255733de16f492dadbf5f4d2809d6c610ba6d86aeRichard Trieu EmitFormatDiagnostic(S.PDiag(diag::warn_format_invalid_positional_specifier) 177355733de16f492dadbf5f4d2809d6c610ba6d86aeRichard Trieu << (unsigned) p, 177455733de16f492dadbf5f4d2809d6c610ba6d86aeRichard Trieu getLocationOfByte(startPos), /*IsStringLocation*/true, 177555733de16f492dadbf5f4d2809d6c610ba6d86aeRichard Trieu getSpecifierRange(startPos, posLen)); 1776efaff195ba1fa55b6fe0b0b2435b81451387d241Ted Kremenek} 1777efaff195ba1fa55b6fe0b0b2435b81451387d241Ted Kremenek 1778826a3457f737f1fc45a22954fd1bfde38160c165Ted Kremenekvoid CheckFormatHandler::HandleZeroPosition(const char *startPos, 1779efaff195ba1fa55b6fe0b0b2435b81451387d241Ted Kremenek unsigned posLen) { 178055733de16f492dadbf5f4d2809d6c610ba6d86aeRichard Trieu EmitFormatDiagnostic(S.PDiag(diag::warn_format_zero_positional_specifier), 178155733de16f492dadbf5f4d2809d6c610ba6d86aeRichard Trieu getLocationOfByte(startPos), 178255733de16f492dadbf5f4d2809d6c610ba6d86aeRichard Trieu /*IsStringLocation*/true, 178355733de16f492dadbf5f4d2809d6c610ba6d86aeRichard Trieu getSpecifierRange(startPos, posLen)); 1784efaff195ba1fa55b6fe0b0b2435b81451387d241Ted Kremenek} 1785efaff195ba1fa55b6fe0b0b2435b81451387d241Ted Kremenek 1786826a3457f737f1fc45a22954fd1bfde38160c165Ted Kremenekvoid CheckFormatHandler::HandleNullChar(const char *nullCharacter) { 17870c06944f5ef31cc6356e30da2971fa5439c4c8efTed Kremenek if (!IsObjCLiteral) { 17880c06944f5ef31cc6356e30da2971fa5439c4c8efTed Kremenek // The presence of a null character is likely an error. 178955733de16f492dadbf5f4d2809d6c610ba6d86aeRichard Trieu EmitFormatDiagnostic( 179055733de16f492dadbf5f4d2809d6c610ba6d86aeRichard Trieu S.PDiag(diag::warn_printf_format_string_contains_null_char), 179155733de16f492dadbf5f4d2809d6c610ba6d86aeRichard Trieu getLocationOfByte(nullCharacter), /*IsStringLocation*/true, 179255733de16f492dadbf5f4d2809d6c610ba6d86aeRichard Trieu getFormatStringRange()); 17930c06944f5ef31cc6356e30da2971fa5439c4c8efTed Kremenek } 1794826a3457f737f1fc45a22954fd1bfde38160c165Ted Kremenek} 1795826a3457f737f1fc45a22954fd1bfde38160c165Ted Kremenek 1796826a3457f737f1fc45a22954fd1bfde38160c165Ted Kremenekconst Expr *CheckFormatHandler::getDataArg(unsigned i) const { 1797826a3457f737f1fc45a22954fd1bfde38160c165Ted Kremenek return TheCall->getArg(FirstDataArg + i); 1798826a3457f737f1fc45a22954fd1bfde38160c165Ted Kremenek} 17994e4b30ec62d78b24e6556fea2624855c193d0e3eTed Kremenek 1800826a3457f737f1fc45a22954fd1bfde38160c165Ted Kremenekvoid CheckFormatHandler::DoneProcessing() { 1801826a3457f737f1fc45a22954fd1bfde38160c165Ted Kremenek // Does the number of data arguments exceed the number of 1802826a3457f737f1fc45a22954fd1bfde38160c165Ted Kremenek // format conversions in the format string? 1803826a3457f737f1fc45a22954fd1bfde38160c165Ted Kremenek if (!HasVAListArg) { 1804826a3457f737f1fc45a22954fd1bfde38160c165Ted Kremenek // Find any arguments that weren't covered. 1805826a3457f737f1fc45a22954fd1bfde38160c165Ted Kremenek CoveredArgs.flip(); 1806826a3457f737f1fc45a22954fd1bfde38160c165Ted Kremenek signed notCoveredArg = CoveredArgs.find_first(); 1807826a3457f737f1fc45a22954fd1bfde38160c165Ted Kremenek if (notCoveredArg >= 0) { 1808826a3457f737f1fc45a22954fd1bfde38160c165Ted Kremenek assert((unsigned)notCoveredArg < NumDataArgs); 180955733de16f492dadbf5f4d2809d6c610ba6d86aeRichard Trieu EmitFormatDiagnostic(S.PDiag(diag::warn_printf_data_arg_not_used), 181055733de16f492dadbf5f4d2809d6c610ba6d86aeRichard Trieu getDataArg((unsigned) notCoveredArg)->getLocStart(), 181155733de16f492dadbf5f4d2809d6c610ba6d86aeRichard Trieu /*IsStringLocation*/false, getFormatStringRange()); 1812826a3457f737f1fc45a22954fd1bfde38160c165Ted Kremenek } 1813826a3457f737f1fc45a22954fd1bfde38160c165Ted Kremenek } 1814826a3457f737f1fc45a22954fd1bfde38160c165Ted Kremenek} 1815826a3457f737f1fc45a22954fd1bfde38160c165Ted Kremenek 1816c09b6a59e02ae265fce51b8c11e2a045bcdaa888Ted Kremenekbool 1817c09b6a59e02ae265fce51b8c11e2a045bcdaa888Ted KremenekCheckFormatHandler::HandleInvalidConversionSpecifier(unsigned argIndex, 1818c09b6a59e02ae265fce51b8c11e2a045bcdaa888Ted Kremenek SourceLocation Loc, 1819c09b6a59e02ae265fce51b8c11e2a045bcdaa888Ted Kremenek const char *startSpec, 1820c09b6a59e02ae265fce51b8c11e2a045bcdaa888Ted Kremenek unsigned specifierLen, 1821c09b6a59e02ae265fce51b8c11e2a045bcdaa888Ted Kremenek const char *csStart, 1822c09b6a59e02ae265fce51b8c11e2a045bcdaa888Ted Kremenek unsigned csLen) { 1823c09b6a59e02ae265fce51b8c11e2a045bcdaa888Ted Kremenek 1824c09b6a59e02ae265fce51b8c11e2a045bcdaa888Ted Kremenek bool keepGoing = true; 1825c09b6a59e02ae265fce51b8c11e2a045bcdaa888Ted Kremenek if (argIndex < NumDataArgs) { 1826c09b6a59e02ae265fce51b8c11e2a045bcdaa888Ted Kremenek // Consider the argument coverered, even though the specifier doesn't 1827c09b6a59e02ae265fce51b8c11e2a045bcdaa888Ted Kremenek // make sense. 1828c09b6a59e02ae265fce51b8c11e2a045bcdaa888Ted Kremenek CoveredArgs.set(argIndex); 1829c09b6a59e02ae265fce51b8c11e2a045bcdaa888Ted Kremenek } 1830c09b6a59e02ae265fce51b8c11e2a045bcdaa888Ted Kremenek else { 1831c09b6a59e02ae265fce51b8c11e2a045bcdaa888Ted Kremenek // If argIndex exceeds the number of data arguments we 1832c09b6a59e02ae265fce51b8c11e2a045bcdaa888Ted Kremenek // don't issue a warning because that is just a cascade of warnings (and 1833c09b6a59e02ae265fce51b8c11e2a045bcdaa888Ted Kremenek // they may have intended '%%' anyway). We don't want to continue processing 1834c09b6a59e02ae265fce51b8c11e2a045bcdaa888Ted Kremenek // the format string after this point, however, as we will like just get 1835c09b6a59e02ae265fce51b8c11e2a045bcdaa888Ted Kremenek // gibberish when trying to match arguments. 1836c09b6a59e02ae265fce51b8c11e2a045bcdaa888Ted Kremenek keepGoing = false; 1837c09b6a59e02ae265fce51b8c11e2a045bcdaa888Ted Kremenek } 1838c09b6a59e02ae265fce51b8c11e2a045bcdaa888Ted Kremenek 183955733de16f492dadbf5f4d2809d6c610ba6d86aeRichard Trieu EmitFormatDiagnostic(S.PDiag(diag::warn_format_invalid_conversion) 184055733de16f492dadbf5f4d2809d6c610ba6d86aeRichard Trieu << StringRef(csStart, csLen), 184155733de16f492dadbf5f4d2809d6c610ba6d86aeRichard Trieu Loc, /*IsStringLocation*/true, 184255733de16f492dadbf5f4d2809d6c610ba6d86aeRichard Trieu getSpecifierRange(startSpec, specifierLen)); 1843c09b6a59e02ae265fce51b8c11e2a045bcdaa888Ted Kremenek 1844c09b6a59e02ae265fce51b8c11e2a045bcdaa888Ted Kremenek return keepGoing; 1845c09b6a59e02ae265fce51b8c11e2a045bcdaa888Ted Kremenek} 1846c09b6a59e02ae265fce51b8c11e2a045bcdaa888Ted Kremenek 184755733de16f492dadbf5f4d2809d6c610ba6d86aeRichard Trieuvoid 184855733de16f492dadbf5f4d2809d6c610ba6d86aeRichard TrieuCheckFormatHandler::HandlePositionalNonpositionalArgs(SourceLocation Loc, 184955733de16f492dadbf5f4d2809d6c610ba6d86aeRichard Trieu const char *startSpec, 185055733de16f492dadbf5f4d2809d6c610ba6d86aeRichard Trieu unsigned specifierLen) { 185155733de16f492dadbf5f4d2809d6c610ba6d86aeRichard Trieu EmitFormatDiagnostic( 185255733de16f492dadbf5f4d2809d6c610ba6d86aeRichard Trieu S.PDiag(diag::warn_format_mix_positional_nonpositional_args), 185355733de16f492dadbf5f4d2809d6c610ba6d86aeRichard Trieu Loc, /*isStringLoc*/true, getSpecifierRange(startSpec, specifierLen)); 185455733de16f492dadbf5f4d2809d6c610ba6d86aeRichard Trieu} 185555733de16f492dadbf5f4d2809d6c610ba6d86aeRichard Trieu 1856666a197deb75d95c78ddd39274af1a54240828d8Ted Kremenekbool 1857666a197deb75d95c78ddd39274af1a54240828d8Ted KremenekCheckFormatHandler::CheckNumArgs( 1858666a197deb75d95c78ddd39274af1a54240828d8Ted Kremenek const analyze_format_string::FormatSpecifier &FS, 1859666a197deb75d95c78ddd39274af1a54240828d8Ted Kremenek const analyze_format_string::ConversionSpecifier &CS, 1860666a197deb75d95c78ddd39274af1a54240828d8Ted Kremenek const char *startSpecifier, unsigned specifierLen, unsigned argIndex) { 1861666a197deb75d95c78ddd39274af1a54240828d8Ted Kremenek 1862666a197deb75d95c78ddd39274af1a54240828d8Ted Kremenek if (argIndex >= NumDataArgs) { 186355733de16f492dadbf5f4d2809d6c610ba6d86aeRichard Trieu PartialDiagnostic PDiag = FS.usesPositionalArg() 186455733de16f492dadbf5f4d2809d6c610ba6d86aeRichard Trieu ? (S.PDiag(diag::warn_printf_positional_arg_exceeds_data_args) 186555733de16f492dadbf5f4d2809d6c610ba6d86aeRichard Trieu << (argIndex+1) << NumDataArgs) 186655733de16f492dadbf5f4d2809d6c610ba6d86aeRichard Trieu : S.PDiag(diag::warn_printf_insufficient_data_args); 186755733de16f492dadbf5f4d2809d6c610ba6d86aeRichard Trieu EmitFormatDiagnostic( 186855733de16f492dadbf5f4d2809d6c610ba6d86aeRichard Trieu PDiag, getLocationOfByte(CS.getStart()), /*IsStringLocation*/true, 186955733de16f492dadbf5f4d2809d6c610ba6d86aeRichard Trieu getSpecifierRange(startSpecifier, specifierLen)); 1870666a197deb75d95c78ddd39274af1a54240828d8Ted Kremenek return false; 1871666a197deb75d95c78ddd39274af1a54240828d8Ted Kremenek } 1872666a197deb75d95c78ddd39274af1a54240828d8Ted Kremenek return true; 1873666a197deb75d95c78ddd39274af1a54240828d8Ted Kremenek} 1874666a197deb75d95c78ddd39274af1a54240828d8Ted Kremenek 187555733de16f492dadbf5f4d2809d6c610ba6d86aeRichard Trieutemplate<typename Range> 187655733de16f492dadbf5f4d2809d6c610ba6d86aeRichard Trieuvoid CheckFormatHandler::EmitFormatDiagnostic(PartialDiagnostic PDiag, 187755733de16f492dadbf5f4d2809d6c610ba6d86aeRichard Trieu SourceLocation Loc, 187855733de16f492dadbf5f4d2809d6c610ba6d86aeRichard Trieu bool IsStringLocation, 187955733de16f492dadbf5f4d2809d6c610ba6d86aeRichard Trieu Range StringRange, 188055733de16f492dadbf5f4d2809d6c610ba6d86aeRichard Trieu FixItHint FixIt) { 188155733de16f492dadbf5f4d2809d6c610ba6d86aeRichard Trieu EmitFormatDiagnostic(S, inFunctionCall, TheCall->getArg(FormatIdx), PDiag, 188255733de16f492dadbf5f4d2809d6c610ba6d86aeRichard Trieu Loc, IsStringLocation, StringRange, FixIt); 188355733de16f492dadbf5f4d2809d6c610ba6d86aeRichard Trieu} 188455733de16f492dadbf5f4d2809d6c610ba6d86aeRichard Trieu 188555733de16f492dadbf5f4d2809d6c610ba6d86aeRichard Trieu/// \brief If the format string is not within the funcion call, emit a note 188655733de16f492dadbf5f4d2809d6c610ba6d86aeRichard Trieu/// so that the function call and string are in diagnostic messages. 188755733de16f492dadbf5f4d2809d6c610ba6d86aeRichard Trieu/// 188855733de16f492dadbf5f4d2809d6c610ba6d86aeRichard Trieu/// \param inFunctionCall if true, the format string is within the function 188955733de16f492dadbf5f4d2809d6c610ba6d86aeRichard Trieu/// call and only one diagnostic message will be produced. Otherwise, an 189055733de16f492dadbf5f4d2809d6c610ba6d86aeRichard Trieu/// extra note will be emitted pointing to location of the format string. 189155733de16f492dadbf5f4d2809d6c610ba6d86aeRichard Trieu/// 189255733de16f492dadbf5f4d2809d6c610ba6d86aeRichard Trieu/// \param ArgumentExpr the expression that is passed as the format string 189355733de16f492dadbf5f4d2809d6c610ba6d86aeRichard Trieu/// argument in the function call. Used for getting locations when two 189455733de16f492dadbf5f4d2809d6c610ba6d86aeRichard Trieu/// diagnostics are emitted. 189555733de16f492dadbf5f4d2809d6c610ba6d86aeRichard Trieu/// 189655733de16f492dadbf5f4d2809d6c610ba6d86aeRichard Trieu/// \param PDiag the callee should already have provided any strings for the 189755733de16f492dadbf5f4d2809d6c610ba6d86aeRichard Trieu/// diagnostic message. This function only adds locations and fixits 189855733de16f492dadbf5f4d2809d6c610ba6d86aeRichard Trieu/// to diagnostics. 189955733de16f492dadbf5f4d2809d6c610ba6d86aeRichard Trieu/// 190055733de16f492dadbf5f4d2809d6c610ba6d86aeRichard Trieu/// \param Loc primary location for diagnostic. If two diagnostics are 190155733de16f492dadbf5f4d2809d6c610ba6d86aeRichard Trieu/// required, one will be at Loc and a new SourceLocation will be created for 190255733de16f492dadbf5f4d2809d6c610ba6d86aeRichard Trieu/// the other one. 190355733de16f492dadbf5f4d2809d6c610ba6d86aeRichard Trieu/// 190455733de16f492dadbf5f4d2809d6c610ba6d86aeRichard Trieu/// \param IsStringLocation if true, Loc points to the format string should be 190555733de16f492dadbf5f4d2809d6c610ba6d86aeRichard Trieu/// used for the note. Otherwise, Loc points to the argument list and will 190655733de16f492dadbf5f4d2809d6c610ba6d86aeRichard Trieu/// be used with PDiag. 190755733de16f492dadbf5f4d2809d6c610ba6d86aeRichard Trieu/// 190855733de16f492dadbf5f4d2809d6c610ba6d86aeRichard Trieu/// \param StringRange some or all of the string to highlight. This is 190955733de16f492dadbf5f4d2809d6c610ba6d86aeRichard Trieu/// templated so it can accept either a CharSourceRange or a SourceRange. 191055733de16f492dadbf5f4d2809d6c610ba6d86aeRichard Trieu/// 191155733de16f492dadbf5f4d2809d6c610ba6d86aeRichard Trieu/// \param Fixit optional fix it hint for the format string. 191255733de16f492dadbf5f4d2809d6c610ba6d86aeRichard Trieutemplate<typename Range> 191355733de16f492dadbf5f4d2809d6c610ba6d86aeRichard Trieuvoid CheckFormatHandler::EmitFormatDiagnostic(Sema &S, bool InFunctionCall, 191455733de16f492dadbf5f4d2809d6c610ba6d86aeRichard Trieu const Expr *ArgumentExpr, 191555733de16f492dadbf5f4d2809d6c610ba6d86aeRichard Trieu PartialDiagnostic PDiag, 191655733de16f492dadbf5f4d2809d6c610ba6d86aeRichard Trieu SourceLocation Loc, 191755733de16f492dadbf5f4d2809d6c610ba6d86aeRichard Trieu bool IsStringLocation, 191855733de16f492dadbf5f4d2809d6c610ba6d86aeRichard Trieu Range StringRange, 191955733de16f492dadbf5f4d2809d6c610ba6d86aeRichard Trieu FixItHint FixIt) { 192055733de16f492dadbf5f4d2809d6c610ba6d86aeRichard Trieu if (InFunctionCall) 192155733de16f492dadbf5f4d2809d6c610ba6d86aeRichard Trieu S.Diag(Loc, PDiag) << StringRange << FixIt; 192255733de16f492dadbf5f4d2809d6c610ba6d86aeRichard Trieu else { 192355733de16f492dadbf5f4d2809d6c610ba6d86aeRichard Trieu S.Diag(IsStringLocation ? ArgumentExpr->getExprLoc() : Loc, PDiag) 192455733de16f492dadbf5f4d2809d6c610ba6d86aeRichard Trieu << ArgumentExpr->getSourceRange(); 192555733de16f492dadbf5f4d2809d6c610ba6d86aeRichard Trieu S.Diag(IsStringLocation ? Loc : StringRange.getBegin(), 192655733de16f492dadbf5f4d2809d6c610ba6d86aeRichard Trieu diag::note_format_string_defined) 192755733de16f492dadbf5f4d2809d6c610ba6d86aeRichard Trieu << StringRange << FixIt; 192855733de16f492dadbf5f4d2809d6c610ba6d86aeRichard Trieu } 192955733de16f492dadbf5f4d2809d6c610ba6d86aeRichard Trieu} 193055733de16f492dadbf5f4d2809d6c610ba6d86aeRichard Trieu 1931826a3457f737f1fc45a22954fd1bfde38160c165Ted Kremenek//===--- CHECK: Printf format string checking ------------------------------===// 1932826a3457f737f1fc45a22954fd1bfde38160c165Ted Kremenek 1933826a3457f737f1fc45a22954fd1bfde38160c165Ted Kremeneknamespace { 1934826a3457f737f1fc45a22954fd1bfde38160c165Ted Kremenekclass CheckPrintfHandler : public CheckFormatHandler { 1935826a3457f737f1fc45a22954fd1bfde38160c165Ted Kremenekpublic: 1936826a3457f737f1fc45a22954fd1bfde38160c165Ted Kremenek CheckPrintfHandler(Sema &s, const StringLiteral *fexpr, 1937826a3457f737f1fc45a22954fd1bfde38160c165Ted Kremenek const Expr *origFormatExpr, unsigned firstDataArg, 1938826a3457f737f1fc45a22954fd1bfde38160c165Ted Kremenek unsigned numDataArgs, bool isObjCLiteral, 1939826a3457f737f1fc45a22954fd1bfde38160c165Ted Kremenek const char *beg, bool hasVAListArg, 194055733de16f492dadbf5f4d2809d6c610ba6d86aeRichard Trieu const CallExpr *theCall, unsigned formatIdx, 194155733de16f492dadbf5f4d2809d6c610ba6d86aeRichard Trieu bool inFunctionCall) 1942826a3457f737f1fc45a22954fd1bfde38160c165Ted Kremenek : CheckFormatHandler(s, fexpr, origFormatExpr, firstDataArg, 1943826a3457f737f1fc45a22954fd1bfde38160c165Ted Kremenek numDataArgs, isObjCLiteral, beg, hasVAListArg, 194455733de16f492dadbf5f4d2809d6c610ba6d86aeRichard Trieu theCall, formatIdx, inFunctionCall) {} 1945826a3457f737f1fc45a22954fd1bfde38160c165Ted Kremenek 1946826a3457f737f1fc45a22954fd1bfde38160c165Ted Kremenek 1947826a3457f737f1fc45a22954fd1bfde38160c165Ted Kremenek bool HandleInvalidPrintfConversionSpecifier( 1948826a3457f737f1fc45a22954fd1bfde38160c165Ted Kremenek const analyze_printf::PrintfSpecifier &FS, 1949826a3457f737f1fc45a22954fd1bfde38160c165Ted Kremenek const char *startSpecifier, 1950826a3457f737f1fc45a22954fd1bfde38160c165Ted Kremenek unsigned specifierLen); 1951826a3457f737f1fc45a22954fd1bfde38160c165Ted Kremenek 1952826a3457f737f1fc45a22954fd1bfde38160c165Ted Kremenek bool HandlePrintfSpecifier(const analyze_printf::PrintfSpecifier &FS, 1953826a3457f737f1fc45a22954fd1bfde38160c165Ted Kremenek const char *startSpecifier, 1954826a3457f737f1fc45a22954fd1bfde38160c165Ted Kremenek unsigned specifierLen); 1955826a3457f737f1fc45a22954fd1bfde38160c165Ted Kremenek 1956826a3457f737f1fc45a22954fd1bfde38160c165Ted Kremenek bool HandleAmount(const analyze_format_string::OptionalAmount &Amt, unsigned k, 1957826a3457f737f1fc45a22954fd1bfde38160c165Ted Kremenek const char *startSpecifier, unsigned specifierLen); 1958826a3457f737f1fc45a22954fd1bfde38160c165Ted Kremenek void HandleInvalidAmount(const analyze_printf::PrintfSpecifier &FS, 1959826a3457f737f1fc45a22954fd1bfde38160c165Ted Kremenek const analyze_printf::OptionalAmount &Amt, 1960826a3457f737f1fc45a22954fd1bfde38160c165Ted Kremenek unsigned type, 1961826a3457f737f1fc45a22954fd1bfde38160c165Ted Kremenek const char *startSpecifier, unsigned specifierLen); 1962826a3457f737f1fc45a22954fd1bfde38160c165Ted Kremenek void HandleFlag(const analyze_printf::PrintfSpecifier &FS, 1963826a3457f737f1fc45a22954fd1bfde38160c165Ted Kremenek const analyze_printf::OptionalFlag &flag, 1964826a3457f737f1fc45a22954fd1bfde38160c165Ted Kremenek const char *startSpecifier, unsigned specifierLen); 1965826a3457f737f1fc45a22954fd1bfde38160c165Ted Kremenek void HandleIgnoredFlag(const analyze_printf::PrintfSpecifier &FS, 1966826a3457f737f1fc45a22954fd1bfde38160c165Ted Kremenek const analyze_printf::OptionalFlag &ignoredFlag, 1967826a3457f737f1fc45a22954fd1bfde38160c165Ted Kremenek const analyze_printf::OptionalFlag &flag, 1968826a3457f737f1fc45a22954fd1bfde38160c165Ted Kremenek const char *startSpecifier, unsigned specifierLen); 1969826a3457f737f1fc45a22954fd1bfde38160c165Ted Kremenek}; 1970826a3457f737f1fc45a22954fd1bfde38160c165Ted Kremenek} 1971826a3457f737f1fc45a22954fd1bfde38160c165Ted Kremenek 1972826a3457f737f1fc45a22954fd1bfde38160c165Ted Kremenekbool CheckPrintfHandler::HandleInvalidPrintfConversionSpecifier( 1973826a3457f737f1fc45a22954fd1bfde38160c165Ted Kremenek const analyze_printf::PrintfSpecifier &FS, 1974826a3457f737f1fc45a22954fd1bfde38160c165Ted Kremenek const char *startSpecifier, 1975826a3457f737f1fc45a22954fd1bfde38160c165Ted Kremenek unsigned specifierLen) { 19766ecb950c65329f8d6ce9ad0514632df35a5ab61fTed Kremenek const analyze_printf::PrintfConversionSpecifier &CS = 1977c09b6a59e02ae265fce51b8c11e2a045bcdaa888Ted Kremenek FS.getConversionSpecifier(); 1978826a3457f737f1fc45a22954fd1bfde38160c165Ted Kremenek 1979c09b6a59e02ae265fce51b8c11e2a045bcdaa888Ted Kremenek return HandleInvalidConversionSpecifier(FS.getArgIndex(), 1980c09b6a59e02ae265fce51b8c11e2a045bcdaa888Ted Kremenek getLocationOfByte(CS.getStart()), 1981c09b6a59e02ae265fce51b8c11e2a045bcdaa888Ted Kremenek startSpecifier, specifierLen, 1982c09b6a59e02ae265fce51b8c11e2a045bcdaa888Ted Kremenek CS.getStart(), CS.getLength()); 198326ac2e07b46bfb4d4f00752c96481c0a98c79c69Ted Kremenek} 198426ac2e07b46bfb4d4f00752c96481c0a98c79c69Ted Kremenek 1985826a3457f737f1fc45a22954fd1bfde38160c165Ted Kremenekbool CheckPrintfHandler::HandleAmount( 1986826a3457f737f1fc45a22954fd1bfde38160c165Ted Kremenek const analyze_format_string::OptionalAmount &Amt, 1987826a3457f737f1fc45a22954fd1bfde38160c165Ted Kremenek unsigned k, const char *startSpecifier, 1988826a3457f737f1fc45a22954fd1bfde38160c165Ted Kremenek unsigned specifierLen) { 19890d27735c51f5bd392e673cf39a675e14e9442387Ted Kremenek 19900d27735c51f5bd392e673cf39a675e14e9442387Ted Kremenek if (Amt.hasDataArgument()) { 19910d27735c51f5bd392e673cf39a675e14e9442387Ted Kremenek if (!HasVAListArg) { 19927f70dc85d5055c19c8003f43a59135de211ad1b9Ted Kremenek unsigned argIndex = Amt.getArgIndex(); 19937f70dc85d5055c19c8003f43a59135de211ad1b9Ted Kremenek if (argIndex >= NumDataArgs) { 199455733de16f492dadbf5f4d2809d6c610ba6d86aeRichard Trieu EmitFormatDiagnostic(S.PDiag(diag::warn_printf_asterisk_missing_arg) 199555733de16f492dadbf5f4d2809d6c610ba6d86aeRichard Trieu << k, 199655733de16f492dadbf5f4d2809d6c610ba6d86aeRichard Trieu getLocationOfByte(Amt.getStart()), 199755733de16f492dadbf5f4d2809d6c610ba6d86aeRichard Trieu /*IsStringLocation*/true, 199855733de16f492dadbf5f4d2809d6c610ba6d86aeRichard Trieu getSpecifierRange(startSpecifier, specifierLen)); 19990d27735c51f5bd392e673cf39a675e14e9442387Ted Kremenek // Don't do any more checking. We will just emit 20000d27735c51f5bd392e673cf39a675e14e9442387Ted Kremenek // spurious errors. 20010d27735c51f5bd392e673cf39a675e14e9442387Ted Kremenek return false; 20020d27735c51f5bd392e673cf39a675e14e9442387Ted Kremenek } 20034e4b30ec62d78b24e6556fea2624855c193d0e3eTed Kremenek 20040d27735c51f5bd392e673cf39a675e14e9442387Ted Kremenek // Type check the data argument. It should be an 'int'. 200531f8e32788adb299acad455363eb7fd244642c82Ted Kremenek // Although not in conformance with C99, we also allow the argument to be 200631f8e32788adb299acad455363eb7fd244642c82Ted Kremenek // an 'unsigned int' as that is a reasonably safe case. GCC also 200731f8e32788adb299acad455363eb7fd244642c82Ted Kremenek // doesn't emit a warning for that case. 20087f70dc85d5055c19c8003f43a59135de211ad1b9Ted Kremenek CoveredArgs.set(argIndex); 20097f70dc85d5055c19c8003f43a59135de211ad1b9Ted Kremenek const Expr *Arg = getDataArg(argIndex); 20100d27735c51f5bd392e673cf39a675e14e9442387Ted Kremenek QualType T = Arg->getType(); 20114e4b30ec62d78b24e6556fea2624855c193d0e3eTed Kremenek 20124e4b30ec62d78b24e6556fea2624855c193d0e3eTed Kremenek const analyze_printf::ArgTypeResult &ATR = Amt.getArgType(S.Context); 20134e4b30ec62d78b24e6556fea2624855c193d0e3eTed Kremenek assert(ATR.isValid()); 20144e4b30ec62d78b24e6556fea2624855c193d0e3eTed Kremenek 20154e4b30ec62d78b24e6556fea2624855c193d0e3eTed Kremenek if (!ATR.matchesType(S.Context, T)) { 201655733de16f492dadbf5f4d2809d6c610ba6d86aeRichard Trieu EmitFormatDiagnostic(S.PDiag(diag::warn_printf_asterisk_wrong_type) 2017a792aff1c7de253b89c473fdb7eef4a5bba83aecHans Wennborg << k << ATR.getRepresentativeTypeName(S.Context) 201855733de16f492dadbf5f4d2809d6c610ba6d86aeRichard Trieu << T << Arg->getSourceRange(), 201955733de16f492dadbf5f4d2809d6c610ba6d86aeRichard Trieu getLocationOfByte(Amt.getStart()), 202055733de16f492dadbf5f4d2809d6c610ba6d86aeRichard Trieu /*IsStringLocation*/true, 202155733de16f492dadbf5f4d2809d6c610ba6d86aeRichard Trieu getSpecifierRange(startSpecifier, specifierLen)); 20220d27735c51f5bd392e673cf39a675e14e9442387Ted Kremenek // Don't do any more checking. We will just emit 20230d27735c51f5bd392e673cf39a675e14e9442387Ted Kremenek // spurious errors. 20240d27735c51f5bd392e673cf39a675e14e9442387Ted Kremenek return false; 20250d27735c51f5bd392e673cf39a675e14e9442387Ted Kremenek } 20260d27735c51f5bd392e673cf39a675e14e9442387Ted Kremenek } 20270d27735c51f5bd392e673cf39a675e14e9442387Ted Kremenek } 20280d27735c51f5bd392e673cf39a675e14e9442387Ted Kremenek return true; 20290d27735c51f5bd392e673cf39a675e14e9442387Ted Kremenek} 20300d27735c51f5bd392e673cf39a675e14e9442387Ted Kremenek 2031e4ee9663168dfb2b4122c768091e30217328c9faTom Carevoid CheckPrintfHandler::HandleInvalidAmount( 2032826a3457f737f1fc45a22954fd1bfde38160c165Ted Kremenek const analyze_printf::PrintfSpecifier &FS, 2033e4ee9663168dfb2b4122c768091e30217328c9faTom Care const analyze_printf::OptionalAmount &Amt, 2034e4ee9663168dfb2b4122c768091e30217328c9faTom Care unsigned type, 2035e4ee9663168dfb2b4122c768091e30217328c9faTom Care const char *startSpecifier, 2036e4ee9663168dfb2b4122c768091e30217328c9faTom Care unsigned specifierLen) { 20376ecb950c65329f8d6ce9ad0514632df35a5ab61fTed Kremenek const analyze_printf::PrintfConversionSpecifier &CS = 20386ecb950c65329f8d6ce9ad0514632df35a5ab61fTed Kremenek FS.getConversionSpecifier(); 2039e4ee9663168dfb2b4122c768091e30217328c9faTom Care 204055733de16f492dadbf5f4d2809d6c610ba6d86aeRichard Trieu FixItHint fixit = 204155733de16f492dadbf5f4d2809d6c610ba6d86aeRichard Trieu Amt.getHowSpecified() == analyze_printf::OptionalAmount::Constant 204255733de16f492dadbf5f4d2809d6c610ba6d86aeRichard Trieu ? FixItHint::CreateRemoval(getSpecifierRange(Amt.getStart(), 204355733de16f492dadbf5f4d2809d6c610ba6d86aeRichard Trieu Amt.getConstantLength())) 204455733de16f492dadbf5f4d2809d6c610ba6d86aeRichard Trieu : FixItHint(); 204555733de16f492dadbf5f4d2809d6c610ba6d86aeRichard Trieu 204655733de16f492dadbf5f4d2809d6c610ba6d86aeRichard Trieu EmitFormatDiagnostic(S.PDiag(diag::warn_printf_nonsensical_optional_amount) 204755733de16f492dadbf5f4d2809d6c610ba6d86aeRichard Trieu << type << CS.toString(), 204855733de16f492dadbf5f4d2809d6c610ba6d86aeRichard Trieu getLocationOfByte(Amt.getStart()), 204955733de16f492dadbf5f4d2809d6c610ba6d86aeRichard Trieu /*IsStringLocation*/true, 205055733de16f492dadbf5f4d2809d6c610ba6d86aeRichard Trieu getSpecifierRange(startSpecifier, specifierLen), 205155733de16f492dadbf5f4d2809d6c610ba6d86aeRichard Trieu fixit); 2052e4ee9663168dfb2b4122c768091e30217328c9faTom Care} 2053e4ee9663168dfb2b4122c768091e30217328c9faTom Care 2054826a3457f737f1fc45a22954fd1bfde38160c165Ted Kremenekvoid CheckPrintfHandler::HandleFlag(const analyze_printf::PrintfSpecifier &FS, 2055e4ee9663168dfb2b4122c768091e30217328c9faTom Care const analyze_printf::OptionalFlag &flag, 2056e4ee9663168dfb2b4122c768091e30217328c9faTom Care const char *startSpecifier, 2057e4ee9663168dfb2b4122c768091e30217328c9faTom Care unsigned specifierLen) { 2058e4ee9663168dfb2b4122c768091e30217328c9faTom Care // Warn about pointless flag with a fixit removal. 20596ecb950c65329f8d6ce9ad0514632df35a5ab61fTed Kremenek const analyze_printf::PrintfConversionSpecifier &CS = 20606ecb950c65329f8d6ce9ad0514632df35a5ab61fTed Kremenek FS.getConversionSpecifier(); 206155733de16f492dadbf5f4d2809d6c610ba6d86aeRichard Trieu EmitFormatDiagnostic(S.PDiag(diag::warn_printf_nonsensical_flag) 206255733de16f492dadbf5f4d2809d6c610ba6d86aeRichard Trieu << flag.toString() << CS.toString(), 206355733de16f492dadbf5f4d2809d6c610ba6d86aeRichard Trieu getLocationOfByte(flag.getPosition()), 206455733de16f492dadbf5f4d2809d6c610ba6d86aeRichard Trieu /*IsStringLocation*/true, 206555733de16f492dadbf5f4d2809d6c610ba6d86aeRichard Trieu getSpecifierRange(startSpecifier, specifierLen), 206655733de16f492dadbf5f4d2809d6c610ba6d86aeRichard Trieu FixItHint::CreateRemoval( 206755733de16f492dadbf5f4d2809d6c610ba6d86aeRichard Trieu getSpecifierRange(flag.getPosition(), 1))); 2068e4ee9663168dfb2b4122c768091e30217328c9faTom Care} 2069e4ee9663168dfb2b4122c768091e30217328c9faTom Care 2070e4ee9663168dfb2b4122c768091e30217328c9faTom Carevoid CheckPrintfHandler::HandleIgnoredFlag( 2071826a3457f737f1fc45a22954fd1bfde38160c165Ted Kremenek const analyze_printf::PrintfSpecifier &FS, 2072e4ee9663168dfb2b4122c768091e30217328c9faTom Care const analyze_printf::OptionalFlag &ignoredFlag, 2073e4ee9663168dfb2b4122c768091e30217328c9faTom Care const analyze_printf::OptionalFlag &flag, 2074e4ee9663168dfb2b4122c768091e30217328c9faTom Care const char *startSpecifier, 2075e4ee9663168dfb2b4122c768091e30217328c9faTom Care unsigned specifierLen) { 2076e4ee9663168dfb2b4122c768091e30217328c9faTom Care // Warn about ignored flag with a fixit removal. 207755733de16f492dadbf5f4d2809d6c610ba6d86aeRichard Trieu EmitFormatDiagnostic(S.PDiag(diag::warn_printf_ignored_flag) 207855733de16f492dadbf5f4d2809d6c610ba6d86aeRichard Trieu << ignoredFlag.toString() << flag.toString(), 207955733de16f492dadbf5f4d2809d6c610ba6d86aeRichard Trieu getLocationOfByte(ignoredFlag.getPosition()), 208055733de16f492dadbf5f4d2809d6c610ba6d86aeRichard Trieu /*IsStringLocation*/true, 208155733de16f492dadbf5f4d2809d6c610ba6d86aeRichard Trieu getSpecifierRange(startSpecifier, specifierLen), 208255733de16f492dadbf5f4d2809d6c610ba6d86aeRichard Trieu FixItHint::CreateRemoval( 208355733de16f492dadbf5f4d2809d6c610ba6d86aeRichard Trieu getSpecifierRange(ignoredFlag.getPosition(), 1))); 2084e4ee9663168dfb2b4122c768091e30217328c9faTom Care} 2085e4ee9663168dfb2b4122c768091e30217328c9faTom Care 2086e0e5313c25f3870d0d18fc67e1b3a3a0e1ef8e07Ted Kremenekbool 2087826a3457f737f1fc45a22954fd1bfde38160c165Ted KremenekCheckPrintfHandler::HandlePrintfSpecifier(const analyze_printf::PrintfSpecifier 20885c41ee8c49995fb4fd76d686b239c15cbab261eaTed Kremenek &FS, 2089e0e5313c25f3870d0d18fc67e1b3a3a0e1ef8e07Ted Kremenek const char *startSpecifier, 2090e0e5313c25f3870d0d18fc67e1b3a3a0e1ef8e07Ted Kremenek unsigned specifierLen) { 2091e0e5313c25f3870d0d18fc67e1b3a3a0e1ef8e07Ted Kremenek 20926ecb950c65329f8d6ce9ad0514632df35a5ab61fTed Kremenek using namespace analyze_format_string; 2093efaff195ba1fa55b6fe0b0b2435b81451387d241Ted Kremenek using namespace analyze_printf; 20946ecb950c65329f8d6ce9ad0514632df35a5ab61fTed Kremenek const PrintfConversionSpecifier &CS = FS.getConversionSpecifier(); 2095e0e5313c25f3870d0d18fc67e1b3a3a0e1ef8e07Ted Kremenek 2096baa400654bd6f8396f9a07188445ae7955b060a3Ted Kremenek if (FS.consumesDataArgument()) { 2097baa400654bd6f8396f9a07188445ae7955b060a3Ted Kremenek if (atFirstArg) { 2098baa400654bd6f8396f9a07188445ae7955b060a3Ted Kremenek atFirstArg = false; 2099baa400654bd6f8396f9a07188445ae7955b060a3Ted Kremenek usesPositionalArgs = FS.usesPositionalArg(); 2100baa400654bd6f8396f9a07188445ae7955b060a3Ted Kremenek } 2101baa400654bd6f8396f9a07188445ae7955b060a3Ted Kremenek else if (usesPositionalArgs != FS.usesPositionalArg()) { 210255733de16f492dadbf5f4d2809d6c610ba6d86aeRichard Trieu HandlePositionalNonpositionalArgs(getLocationOfByte(CS.getStart()), 210355733de16f492dadbf5f4d2809d6c610ba6d86aeRichard Trieu startSpecifier, specifierLen); 2104baa400654bd6f8396f9a07188445ae7955b060a3Ted Kremenek return false; 2105baa400654bd6f8396f9a07188445ae7955b060a3Ted Kremenek } 2106efaff195ba1fa55b6fe0b0b2435b81451387d241Ted Kremenek } 2107efaff195ba1fa55b6fe0b0b2435b81451387d241Ted Kremenek 21080d27735c51f5bd392e673cf39a675e14e9442387Ted Kremenek // First check if the field width, precision, and conversion specifier 21090d27735c51f5bd392e673cf39a675e14e9442387Ted Kremenek // have matching data arguments. 2110efaff195ba1fa55b6fe0b0b2435b81451387d241Ted Kremenek if (!HandleAmount(FS.getFieldWidth(), /* field width */ 0, 2111efaff195ba1fa55b6fe0b0b2435b81451387d241Ted Kremenek startSpecifier, specifierLen)) { 21120d27735c51f5bd392e673cf39a675e14e9442387Ted Kremenek return false; 21130d27735c51f5bd392e673cf39a675e14e9442387Ted Kremenek } 21144e4b30ec62d78b24e6556fea2624855c193d0e3eTed Kremenek 2115efaff195ba1fa55b6fe0b0b2435b81451387d241Ted Kremenek if (!HandleAmount(FS.getPrecision(), /* precision */ 1, 2116efaff195ba1fa55b6fe0b0b2435b81451387d241Ted Kremenek startSpecifier, specifierLen)) { 21170d27735c51f5bd392e673cf39a675e14e9442387Ted Kremenek return false; 21180d27735c51f5bd392e673cf39a675e14e9442387Ted Kremenek } 21190d27735c51f5bd392e673cf39a675e14e9442387Ted Kremenek 2120f88c8e02da48afea6a04091f675af5c4facd99f1Ted Kremenek if (!CS.consumesDataArgument()) { 2121f88c8e02da48afea6a04091f675af5c4facd99f1Ted Kremenek // FIXME: Technically specifying a precision or field width here 2122f88c8e02da48afea6a04091f675af5c4facd99f1Ted Kremenek // makes no sense. Worth issuing a warning at some point. 21230e5675de2b67eeca754754ae8d3dacba425a38e8Ted Kremenek return true; 2124f88c8e02da48afea6a04091f675af5c4facd99f1Ted Kremenek } 21254e4b30ec62d78b24e6556fea2624855c193d0e3eTed Kremenek 21267f70dc85d5055c19c8003f43a59135de211ad1b9Ted Kremenek // Consume the argument. 21277f70dc85d5055c19c8003f43a59135de211ad1b9Ted Kremenek unsigned argIndex = FS.getArgIndex(); 2128e3fc54790250076e33ad25b14e5be293514fe5eaTed Kremenek if (argIndex < NumDataArgs) { 2129e3fc54790250076e33ad25b14e5be293514fe5eaTed Kremenek // The check to see if the argIndex is valid will come later. 2130e3fc54790250076e33ad25b14e5be293514fe5eaTed Kremenek // We set the bit here because we may exit early from this 2131e3fc54790250076e33ad25b14e5be293514fe5eaTed Kremenek // function if we encounter some other error. 2132e3fc54790250076e33ad25b14e5be293514fe5eaTed Kremenek CoveredArgs.set(argIndex); 2133e3fc54790250076e33ad25b14e5be293514fe5eaTed Kremenek } 21347f70dc85d5055c19c8003f43a59135de211ad1b9Ted Kremenek 21357f70dc85d5055c19c8003f43a59135de211ad1b9Ted Kremenek // Check for using an Objective-C specific conversion specifier 21367f70dc85d5055c19c8003f43a59135de211ad1b9Ted Kremenek // in a non-ObjC literal. 21377f70dc85d5055c19c8003f43a59135de211ad1b9Ted Kremenek if (!IsObjCLiteral && CS.isObjCArg()) { 2138826a3457f737f1fc45a22954fd1bfde38160c165Ted Kremenek return HandleInvalidPrintfConversionSpecifier(FS, startSpecifier, 2139826a3457f737f1fc45a22954fd1bfde38160c165Ted Kremenek specifierLen); 21407f70dc85d5055c19c8003f43a59135de211ad1b9Ted Kremenek } 21414e4b30ec62d78b24e6556fea2624855c193d0e3eTed Kremenek 2142e4ee9663168dfb2b4122c768091e30217328c9faTom Care // Check for invalid use of field width 2143e4ee9663168dfb2b4122c768091e30217328c9faTom Care if (!FS.hasValidFieldWidth()) { 214445f9b7e8f23072d662ee1cc758f4ecb0da5e3322Tom Care HandleInvalidAmount(FS, FS.getFieldWidth(), /* field width */ 0, 2145e4ee9663168dfb2b4122c768091e30217328c9faTom Care startSpecifier, specifierLen); 2146e4ee9663168dfb2b4122c768091e30217328c9faTom Care } 2147e4ee9663168dfb2b4122c768091e30217328c9faTom Care 2148e4ee9663168dfb2b4122c768091e30217328c9faTom Care // Check for invalid use of precision 2149e4ee9663168dfb2b4122c768091e30217328c9faTom Care if (!FS.hasValidPrecision()) { 2150e4ee9663168dfb2b4122c768091e30217328c9faTom Care HandleInvalidAmount(FS, FS.getPrecision(), /* precision */ 1, 2151e4ee9663168dfb2b4122c768091e30217328c9faTom Care startSpecifier, specifierLen); 2152e4ee9663168dfb2b4122c768091e30217328c9faTom Care } 2153e4ee9663168dfb2b4122c768091e30217328c9faTom Care 2154e4ee9663168dfb2b4122c768091e30217328c9faTom Care // Check each flag does not conflict with any other component. 215565197b4b0c55bb74af0450230d61ee9461223721Ted Kremenek if (!FS.hasValidThousandsGroupingPrefix()) 215665197b4b0c55bb74af0450230d61ee9461223721Ted Kremenek HandleFlag(FS, FS.hasThousandsGrouping(), startSpecifier, specifierLen); 2157e4ee9663168dfb2b4122c768091e30217328c9faTom Care if (!FS.hasValidLeadingZeros()) 2158e4ee9663168dfb2b4122c768091e30217328c9faTom Care HandleFlag(FS, FS.hasLeadingZeros(), startSpecifier, specifierLen); 2159e4ee9663168dfb2b4122c768091e30217328c9faTom Care if (!FS.hasValidPlusPrefix()) 2160e4ee9663168dfb2b4122c768091e30217328c9faTom Care HandleFlag(FS, FS.hasPlusPrefix(), startSpecifier, specifierLen); 216145f9b7e8f23072d662ee1cc758f4ecb0da5e3322Tom Care if (!FS.hasValidSpacePrefix()) 216245f9b7e8f23072d662ee1cc758f4ecb0da5e3322Tom Care HandleFlag(FS, FS.hasSpacePrefix(), startSpecifier, specifierLen); 2163e4ee9663168dfb2b4122c768091e30217328c9faTom Care if (!FS.hasValidAlternativeForm()) 2164e4ee9663168dfb2b4122c768091e30217328c9faTom Care HandleFlag(FS, FS.hasAlternativeForm(), startSpecifier, specifierLen); 2165e4ee9663168dfb2b4122c768091e30217328c9faTom Care if (!FS.hasValidLeftJustified()) 2166e4ee9663168dfb2b4122c768091e30217328c9faTom Care HandleFlag(FS, FS.isLeftJustified(), startSpecifier, specifierLen); 2167e4ee9663168dfb2b4122c768091e30217328c9faTom Care 2168e4ee9663168dfb2b4122c768091e30217328c9faTom Care // Check that flags are not ignored by another flag 216945f9b7e8f23072d662ee1cc758f4ecb0da5e3322Tom Care if (FS.hasSpacePrefix() && FS.hasPlusPrefix()) // ' ' ignored by '+' 217045f9b7e8f23072d662ee1cc758f4ecb0da5e3322Tom Care HandleIgnoredFlag(FS, FS.hasSpacePrefix(), FS.hasPlusPrefix(), 217145f9b7e8f23072d662ee1cc758f4ecb0da5e3322Tom Care startSpecifier, specifierLen); 2172e4ee9663168dfb2b4122c768091e30217328c9faTom Care if (FS.hasLeadingZeros() && FS.isLeftJustified()) // '0' ignored by '-' 2173e4ee9663168dfb2b4122c768091e30217328c9faTom Care HandleIgnoredFlag(FS, FS.hasLeadingZeros(), FS.isLeftJustified(), 2174e4ee9663168dfb2b4122c768091e30217328c9faTom Care startSpecifier, specifierLen); 2175e4ee9663168dfb2b4122c768091e30217328c9faTom Care 2176e4ee9663168dfb2b4122c768091e30217328c9faTom Care // Check the length modifier is valid with the given conversion specifier. 2177e4ee9663168dfb2b4122c768091e30217328c9faTom Care const LengthModifier &LM = FS.getLengthModifier(); 2178e4ee9663168dfb2b4122c768091e30217328c9faTom Care if (!FS.hasValidLengthModifier()) 217955733de16f492dadbf5f4d2809d6c610ba6d86aeRichard Trieu EmitFormatDiagnostic(S.PDiag(diag::warn_format_nonsensical_length) 218055733de16f492dadbf5f4d2809d6c610ba6d86aeRichard Trieu << LM.toString() << CS.toString(), 218155733de16f492dadbf5f4d2809d6c610ba6d86aeRichard Trieu getLocationOfByte(LM.getStart()), 218255733de16f492dadbf5f4d2809d6c610ba6d86aeRichard Trieu /*IsStringLocation*/true, 218355733de16f492dadbf5f4d2809d6c610ba6d86aeRichard Trieu getSpecifierRange(startSpecifier, specifierLen), 218455733de16f492dadbf5f4d2809d6c610ba6d86aeRichard Trieu FixItHint::CreateRemoval( 218555733de16f492dadbf5f4d2809d6c610ba6d86aeRichard Trieu getSpecifierRange(LM.getStart(), 218655733de16f492dadbf5f4d2809d6c610ba6d86aeRichard Trieu LM.getLength()))); 2187e4ee9663168dfb2b4122c768091e30217328c9faTom Care 2188e4ee9663168dfb2b4122c768091e30217328c9faTom Care // Are we using '%n'? 218935d353b47bce29200b910371dd9b8ba7f3058ab8Ted Kremenek if (CS.getKind() == ConversionSpecifier::nArg) { 2190e4ee9663168dfb2b4122c768091e30217328c9faTom Care // Issue a warning about this being a possible security issue. 219155733de16f492dadbf5f4d2809d6c610ba6d86aeRichard Trieu EmitFormatDiagnostic(S.PDiag(diag::warn_printf_write_back), 219255733de16f492dadbf5f4d2809d6c610ba6d86aeRichard Trieu getLocationOfByte(CS.getStart()), 219355733de16f492dadbf5f4d2809d6c610ba6d86aeRichard Trieu /*IsStringLocation*/true, 219455733de16f492dadbf5f4d2809d6c610ba6d86aeRichard Trieu getSpecifierRange(startSpecifier, specifierLen)); 2195e82d804ee761006250543d6fe6e98ee7896cd756Ted Kremenek // Continue checking the other format specifiers. 2196e82d804ee761006250543d6fe6e98ee7896cd756Ted Kremenek return true; 2197e82d804ee761006250543d6fe6e98ee7896cd756Ted Kremenek } 21985c41ee8c49995fb4fd76d686b239c15cbab261eaTed Kremenek 2199da51f0d136df131a0137c0ec1069fb586d8a296aTed Kremenek // The remaining checks depend on the data arguments. 2200da51f0d136df131a0137c0ec1069fb586d8a296aTed Kremenek if (HasVAListArg) 2201da51f0d136df131a0137c0ec1069fb586d8a296aTed Kremenek return true; 22024e4b30ec62d78b24e6556fea2624855c193d0e3eTed Kremenek 2203666a197deb75d95c78ddd39274af1a54240828d8Ted Kremenek if (!CheckNumArgs(FS, CS, startSpecifier, specifierLen, argIndex)) 2204da51f0d136df131a0137c0ec1069fb586d8a296aTed Kremenek return false; 22054e4b30ec62d78b24e6556fea2624855c193d0e3eTed Kremenek 220696827eb52405a71c65c200949f3e644368e86454Michael J. Spencer // Now type check the data expression that matches the 220796827eb52405a71c65c200949f3e644368e86454Michael J. Spencer // format specifier. 220896827eb52405a71c65c200949f3e644368e86454Michael J. Spencer const Expr *Ex = getDataArg(argIndex); 2209687b5df89d4ba91219df578d02087c68c09a0332Nick Lewycky const analyze_printf::ArgTypeResult &ATR = FS.getArgType(S.Context); 221096827eb52405a71c65c200949f3e644368e86454Michael J. Spencer if (ATR.isValid() && !ATR.matchesType(S.Context, Ex->getType())) { 221196827eb52405a71c65c200949f3e644368e86454Michael J. Spencer // Check if we didn't match because of an implicit cast from a 'char' 221296827eb52405a71c65c200949f3e644368e86454Michael J. Spencer // or 'short' to an 'int'. This is done because printf is a varargs 221396827eb52405a71c65c200949f3e644368e86454Michael J. Spencer // function. 221496827eb52405a71c65c200949f3e644368e86454Michael J. Spencer if (const ImplicitCastExpr *ICE = dyn_cast<ImplicitCastExpr>(Ex)) 22154d8ae4d57ed18d60da4d3786fb740607aa7c3688Ted Kremenek if (ICE->getType() == S.Context.IntTy) { 22164d8ae4d57ed18d60da4d3786fb740607aa7c3688Ted Kremenek // All further checking is done on the subexpression. 22174d8ae4d57ed18d60da4d3786fb740607aa7c3688Ted Kremenek Ex = ICE->getSubExpr(); 22184d8ae4d57ed18d60da4d3786fb740607aa7c3688Ted Kremenek if (ATR.matchesType(S.Context, Ex->getType())) 221996827eb52405a71c65c200949f3e644368e86454Michael J. Spencer return true; 22204d8ae4d57ed18d60da4d3786fb740607aa7c3688Ted Kremenek } 222196827eb52405a71c65c200949f3e644368e86454Michael J. Spencer 222296827eb52405a71c65c200949f3e644368e86454Michael J. Spencer // We may be able to offer a FixItHint if it is a supported type. 222396827eb52405a71c65c200949f3e644368e86454Michael J. Spencer PrintfSpecifier fixedFS = FS; 2224a7da2155167676a6a5d9fca4de947a9cab2a4908Hans Wennborg bool success = fixedFS.fixType(Ex->getType(), S.getLangOptions()); 222596827eb52405a71c65c200949f3e644368e86454Michael J. Spencer 222696827eb52405a71c65c200949f3e644368e86454Michael J. Spencer if (success) { 222796827eb52405a71c65c200949f3e644368e86454Michael J. Spencer // Get the fix string from the fixed format specifier 222896827eb52405a71c65c200949f3e644368e86454Michael J. Spencer llvm::SmallString<128> buf; 222996827eb52405a71c65c200949f3e644368e86454Michael J. Spencer llvm::raw_svector_ostream os(buf); 223096827eb52405a71c65c200949f3e644368e86454Michael J. Spencer fixedFS.toString(os); 223196827eb52405a71c65c200949f3e644368e86454Michael J. Spencer 223255733de16f492dadbf5f4d2809d6c610ba6d86aeRichard Trieu EmitFormatDiagnostic( 223355733de16f492dadbf5f4d2809d6c610ba6d86aeRichard Trieu S.PDiag(diag::warn_printf_conversion_argument_type_mismatch) 2234a792aff1c7de253b89c473fdb7eef4a5bba83aecHans Wennborg << ATR.getRepresentativeTypeName(S.Context) << Ex->getType() 223555733de16f492dadbf5f4d2809d6c610ba6d86aeRichard Trieu << Ex->getSourceRange(), 223655733de16f492dadbf5f4d2809d6c610ba6d86aeRichard Trieu getLocationOfByte(CS.getStart()), 223755733de16f492dadbf5f4d2809d6c610ba6d86aeRichard Trieu /*IsStringLocation*/true, 223855733de16f492dadbf5f4d2809d6c610ba6d86aeRichard Trieu getSpecifierRange(startSpecifier, specifierLen), 223955733de16f492dadbf5f4d2809d6c610ba6d86aeRichard Trieu FixItHint::CreateReplacement( 224055733de16f492dadbf5f4d2809d6c610ba6d86aeRichard Trieu getSpecifierRange(startSpecifier, specifierLen), 224155733de16f492dadbf5f4d2809d6c610ba6d86aeRichard Trieu os.str())); 224296827eb52405a71c65c200949f3e644368e86454Michael J. Spencer } 224396827eb52405a71c65c200949f3e644368e86454Michael J. Spencer else { 224496827eb52405a71c65c200949f3e644368e86454Michael J. Spencer S.Diag(getLocationOfByte(CS.getStart()), 224596827eb52405a71c65c200949f3e644368e86454Michael J. Spencer diag::warn_printf_conversion_argument_type_mismatch) 2246a792aff1c7de253b89c473fdb7eef4a5bba83aecHans Wennborg << ATR.getRepresentativeTypeName(S.Context) << Ex->getType() 224796827eb52405a71c65c200949f3e644368e86454Michael J. Spencer << getSpecifierRange(startSpecifier, specifierLen) 224896827eb52405a71c65c200949f3e644368e86454Michael J. Spencer << Ex->getSourceRange(); 224996827eb52405a71c65c200949f3e644368e86454Michael J. Spencer } 225096827eb52405a71c65c200949f3e644368e86454Michael J. Spencer } 225196827eb52405a71c65c200949f3e644368e86454Michael J. Spencer 2252e0e5313c25f3870d0d18fc67e1b3a3a0e1ef8e07Ted Kremenek return true; 2253e0e5313c25f3870d0d18fc67e1b3a3a0e1ef8e07Ted Kremenek} 2254e0e5313c25f3870d0d18fc67e1b3a3a0e1ef8e07Ted Kremenek 2255826a3457f737f1fc45a22954fd1bfde38160c165Ted Kremenek//===--- CHECK: Scanf format string checking ------------------------------===// 2256826a3457f737f1fc45a22954fd1bfde38160c165Ted Kremenek 2257826a3457f737f1fc45a22954fd1bfde38160c165Ted Kremeneknamespace { 2258826a3457f737f1fc45a22954fd1bfde38160c165Ted Kremenekclass CheckScanfHandler : public CheckFormatHandler { 2259826a3457f737f1fc45a22954fd1bfde38160c165Ted Kremenekpublic: 2260826a3457f737f1fc45a22954fd1bfde38160c165Ted Kremenek CheckScanfHandler(Sema &s, const StringLiteral *fexpr, 2261826a3457f737f1fc45a22954fd1bfde38160c165Ted Kremenek const Expr *origFormatExpr, unsigned firstDataArg, 2262826a3457f737f1fc45a22954fd1bfde38160c165Ted Kremenek unsigned numDataArgs, bool isObjCLiteral, 2263826a3457f737f1fc45a22954fd1bfde38160c165Ted Kremenek const char *beg, bool hasVAListArg, 226455733de16f492dadbf5f4d2809d6c610ba6d86aeRichard Trieu const CallExpr *theCall, unsigned formatIdx, 226555733de16f492dadbf5f4d2809d6c610ba6d86aeRichard Trieu bool inFunctionCall) 2266826a3457f737f1fc45a22954fd1bfde38160c165Ted Kremenek : CheckFormatHandler(s, fexpr, origFormatExpr, firstDataArg, 2267826a3457f737f1fc45a22954fd1bfde38160c165Ted Kremenek numDataArgs, isObjCLiteral, beg, hasVAListArg, 226855733de16f492dadbf5f4d2809d6c610ba6d86aeRichard Trieu theCall, formatIdx, inFunctionCall) {} 2269826a3457f737f1fc45a22954fd1bfde38160c165Ted Kremenek 2270826a3457f737f1fc45a22954fd1bfde38160c165Ted Kremenek bool HandleScanfSpecifier(const analyze_scanf::ScanfSpecifier &FS, 2271826a3457f737f1fc45a22954fd1bfde38160c165Ted Kremenek const char *startSpecifier, 2272826a3457f737f1fc45a22954fd1bfde38160c165Ted Kremenek unsigned specifierLen); 2273c09b6a59e02ae265fce51b8c11e2a045bcdaa888Ted Kremenek 2274c09b6a59e02ae265fce51b8c11e2a045bcdaa888Ted Kremenek bool HandleInvalidScanfConversionSpecifier( 2275c09b6a59e02ae265fce51b8c11e2a045bcdaa888Ted Kremenek const analyze_scanf::ScanfSpecifier &FS, 2276c09b6a59e02ae265fce51b8c11e2a045bcdaa888Ted Kremenek const char *startSpecifier, 2277c09b6a59e02ae265fce51b8c11e2a045bcdaa888Ted Kremenek unsigned specifierLen); 2278b7c21018ec1049580cf6df88db09e606550a7baaTed Kremenek 2279b7c21018ec1049580cf6df88db09e606550a7baaTed Kremenek void HandleIncompleteScanList(const char *start, const char *end); 2280826a3457f737f1fc45a22954fd1bfde38160c165Ted Kremenek}; 2281826a3457f737f1fc45a22954fd1bfde38160c165Ted Kremenek} 2282826a3457f737f1fc45a22954fd1bfde38160c165Ted Kremenek 2283b7c21018ec1049580cf6df88db09e606550a7baaTed Kremenekvoid CheckScanfHandler::HandleIncompleteScanList(const char *start, 2284b7c21018ec1049580cf6df88db09e606550a7baaTed Kremenek const char *end) { 228555733de16f492dadbf5f4d2809d6c610ba6d86aeRichard Trieu EmitFormatDiagnostic(S.PDiag(diag::warn_scanf_scanlist_incomplete), 228655733de16f492dadbf5f4d2809d6c610ba6d86aeRichard Trieu getLocationOfByte(end), /*IsStringLocation*/true, 228755733de16f492dadbf5f4d2809d6c610ba6d86aeRichard Trieu getSpecifierRange(start, end - start)); 2288b7c21018ec1049580cf6df88db09e606550a7baaTed Kremenek} 2289b7c21018ec1049580cf6df88db09e606550a7baaTed Kremenek 2290c09b6a59e02ae265fce51b8c11e2a045bcdaa888Ted Kremenekbool CheckScanfHandler::HandleInvalidScanfConversionSpecifier( 2291c09b6a59e02ae265fce51b8c11e2a045bcdaa888Ted Kremenek const analyze_scanf::ScanfSpecifier &FS, 2292c09b6a59e02ae265fce51b8c11e2a045bcdaa888Ted Kremenek const char *startSpecifier, 2293c09b6a59e02ae265fce51b8c11e2a045bcdaa888Ted Kremenek unsigned specifierLen) { 2294c09b6a59e02ae265fce51b8c11e2a045bcdaa888Ted Kremenek 22956ecb950c65329f8d6ce9ad0514632df35a5ab61fTed Kremenek const analyze_scanf::ScanfConversionSpecifier &CS = 2296c09b6a59e02ae265fce51b8c11e2a045bcdaa888Ted Kremenek FS.getConversionSpecifier(); 2297c09b6a59e02ae265fce51b8c11e2a045bcdaa888Ted Kremenek 2298c09b6a59e02ae265fce51b8c11e2a045bcdaa888Ted Kremenek return HandleInvalidConversionSpecifier(FS.getArgIndex(), 2299c09b6a59e02ae265fce51b8c11e2a045bcdaa888Ted Kremenek getLocationOfByte(CS.getStart()), 2300c09b6a59e02ae265fce51b8c11e2a045bcdaa888Ted Kremenek startSpecifier, specifierLen, 2301c09b6a59e02ae265fce51b8c11e2a045bcdaa888Ted Kremenek CS.getStart(), CS.getLength()); 2302c09b6a59e02ae265fce51b8c11e2a045bcdaa888Ted Kremenek} 2303c09b6a59e02ae265fce51b8c11e2a045bcdaa888Ted Kremenek 2304826a3457f737f1fc45a22954fd1bfde38160c165Ted Kremenekbool CheckScanfHandler::HandleScanfSpecifier( 2305826a3457f737f1fc45a22954fd1bfde38160c165Ted Kremenek const analyze_scanf::ScanfSpecifier &FS, 2306826a3457f737f1fc45a22954fd1bfde38160c165Ted Kremenek const char *startSpecifier, 2307826a3457f737f1fc45a22954fd1bfde38160c165Ted Kremenek unsigned specifierLen) { 2308826a3457f737f1fc45a22954fd1bfde38160c165Ted Kremenek 2309826a3457f737f1fc45a22954fd1bfde38160c165Ted Kremenek using namespace analyze_scanf; 2310826a3457f737f1fc45a22954fd1bfde38160c165Ted Kremenek using namespace analyze_format_string; 2311826a3457f737f1fc45a22954fd1bfde38160c165Ted Kremenek 23126ecb950c65329f8d6ce9ad0514632df35a5ab61fTed Kremenek const ScanfConversionSpecifier &CS = FS.getConversionSpecifier(); 2313826a3457f737f1fc45a22954fd1bfde38160c165Ted Kremenek 2314baa400654bd6f8396f9a07188445ae7955b060a3Ted Kremenek // Handle case where '%' and '*' don't consume an argument. These shouldn't 2315baa400654bd6f8396f9a07188445ae7955b060a3Ted Kremenek // be used to decide if we are using positional arguments consistently. 2316baa400654bd6f8396f9a07188445ae7955b060a3Ted Kremenek if (FS.consumesDataArgument()) { 2317baa400654bd6f8396f9a07188445ae7955b060a3Ted Kremenek if (atFirstArg) { 2318baa400654bd6f8396f9a07188445ae7955b060a3Ted Kremenek atFirstArg = false; 2319baa400654bd6f8396f9a07188445ae7955b060a3Ted Kremenek usesPositionalArgs = FS.usesPositionalArg(); 2320baa400654bd6f8396f9a07188445ae7955b060a3Ted Kremenek } 2321baa400654bd6f8396f9a07188445ae7955b060a3Ted Kremenek else if (usesPositionalArgs != FS.usesPositionalArg()) { 232255733de16f492dadbf5f4d2809d6c610ba6d86aeRichard Trieu HandlePositionalNonpositionalArgs(getLocationOfByte(CS.getStart()), 232355733de16f492dadbf5f4d2809d6c610ba6d86aeRichard Trieu startSpecifier, specifierLen); 2324baa400654bd6f8396f9a07188445ae7955b060a3Ted Kremenek return false; 2325baa400654bd6f8396f9a07188445ae7955b060a3Ted Kremenek } 2326826a3457f737f1fc45a22954fd1bfde38160c165Ted Kremenek } 2327826a3457f737f1fc45a22954fd1bfde38160c165Ted Kremenek 2328826a3457f737f1fc45a22954fd1bfde38160c165Ted Kremenek // Check if the field with is non-zero. 2329826a3457f737f1fc45a22954fd1bfde38160c165Ted Kremenek const OptionalAmount &Amt = FS.getFieldWidth(); 2330826a3457f737f1fc45a22954fd1bfde38160c165Ted Kremenek if (Amt.getHowSpecified() == OptionalAmount::Constant) { 2331826a3457f737f1fc45a22954fd1bfde38160c165Ted Kremenek if (Amt.getConstantAmount() == 0) { 2332826a3457f737f1fc45a22954fd1bfde38160c165Ted Kremenek const CharSourceRange &R = getSpecifierRange(Amt.getStart(), 2333826a3457f737f1fc45a22954fd1bfde38160c165Ted Kremenek Amt.getConstantLength()); 233455733de16f492dadbf5f4d2809d6c610ba6d86aeRichard Trieu EmitFormatDiagnostic(S.PDiag(diag::warn_scanf_nonzero_width), 233555733de16f492dadbf5f4d2809d6c610ba6d86aeRichard Trieu getLocationOfByte(Amt.getStart()), 233655733de16f492dadbf5f4d2809d6c610ba6d86aeRichard Trieu /*IsStringLocation*/true, R, 233755733de16f492dadbf5f4d2809d6c610ba6d86aeRichard Trieu FixItHint::CreateRemoval(R)); 23387f70dc85d5055c19c8003f43a59135de211ad1b9Ted Kremenek } 23397f70dc85d5055c19c8003f43a59135de211ad1b9Ted Kremenek } 2340826a3457f737f1fc45a22954fd1bfde38160c165Ted Kremenek 2341826a3457f737f1fc45a22954fd1bfde38160c165Ted Kremenek if (!FS.consumesDataArgument()) { 2342826a3457f737f1fc45a22954fd1bfde38160c165Ted Kremenek // FIXME: Technically specifying a precision or field width here 2343826a3457f737f1fc45a22954fd1bfde38160c165Ted Kremenek // makes no sense. Worth issuing a warning at some point. 2344826a3457f737f1fc45a22954fd1bfde38160c165Ted Kremenek return true; 2345826a3457f737f1fc45a22954fd1bfde38160c165Ted Kremenek } 2346826a3457f737f1fc45a22954fd1bfde38160c165Ted Kremenek 2347826a3457f737f1fc45a22954fd1bfde38160c165Ted Kremenek // Consume the argument. 2348826a3457f737f1fc45a22954fd1bfde38160c165Ted Kremenek unsigned argIndex = FS.getArgIndex(); 2349826a3457f737f1fc45a22954fd1bfde38160c165Ted Kremenek if (argIndex < NumDataArgs) { 2350826a3457f737f1fc45a22954fd1bfde38160c165Ted Kremenek // The check to see if the argIndex is valid will come later. 2351826a3457f737f1fc45a22954fd1bfde38160c165Ted Kremenek // We set the bit here because we may exit early from this 2352826a3457f737f1fc45a22954fd1bfde38160c165Ted Kremenek // function if we encounter some other error. 2353826a3457f737f1fc45a22954fd1bfde38160c165Ted Kremenek CoveredArgs.set(argIndex); 2354826a3457f737f1fc45a22954fd1bfde38160c165Ted Kremenek } 2355826a3457f737f1fc45a22954fd1bfde38160c165Ted Kremenek 23561e51c200b17cb6b0238c10a8760ae04765688f16Ted Kremenek // Check the length modifier is valid with the given conversion specifier. 23571e51c200b17cb6b0238c10a8760ae04765688f16Ted Kremenek const LengthModifier &LM = FS.getLengthModifier(); 23581e51c200b17cb6b0238c10a8760ae04765688f16Ted Kremenek if (!FS.hasValidLengthModifier()) { 23591e51c200b17cb6b0238c10a8760ae04765688f16Ted Kremenek S.Diag(getLocationOfByte(LM.getStart()), 23601e51c200b17cb6b0238c10a8760ae04765688f16Ted Kremenek diag::warn_format_nonsensical_length) 23611e51c200b17cb6b0238c10a8760ae04765688f16Ted Kremenek << LM.toString() << CS.toString() 23621e51c200b17cb6b0238c10a8760ae04765688f16Ted Kremenek << getSpecifierRange(startSpecifier, specifierLen) 23631e51c200b17cb6b0238c10a8760ae04765688f16Ted Kremenek << FixItHint::CreateRemoval(getSpecifierRange(LM.getStart(), 23641e51c200b17cb6b0238c10a8760ae04765688f16Ted Kremenek LM.getLength())); 23651e51c200b17cb6b0238c10a8760ae04765688f16Ted Kremenek } 23661e51c200b17cb6b0238c10a8760ae04765688f16Ted Kremenek 2367826a3457f737f1fc45a22954fd1bfde38160c165Ted Kremenek // The remaining checks depend on the data arguments. 2368826a3457f737f1fc45a22954fd1bfde38160c165Ted Kremenek if (HasVAListArg) 2369826a3457f737f1fc45a22954fd1bfde38160c165Ted Kremenek return true; 2370826a3457f737f1fc45a22954fd1bfde38160c165Ted Kremenek 2371666a197deb75d95c78ddd39274af1a54240828d8Ted Kremenek if (!CheckNumArgs(FS, CS, startSpecifier, specifierLen, argIndex)) 2372826a3457f737f1fc45a22954fd1bfde38160c165Ted Kremenek return false; 2373826a3457f737f1fc45a22954fd1bfde38160c165Ted Kremenek 23746fcd932dfd6835f70cc00d6f7c6789793f6d7b66Hans Wennborg // Check that the argument type matches the format specifier. 23756fcd932dfd6835f70cc00d6f7c6789793f6d7b66Hans Wennborg const Expr *Ex = getDataArg(argIndex); 23766fcd932dfd6835f70cc00d6f7c6789793f6d7b66Hans Wennborg const analyze_scanf::ScanfArgTypeResult &ATR = FS.getArgType(S.Context); 23776fcd932dfd6835f70cc00d6f7c6789793f6d7b66Hans Wennborg if (ATR.isValid() && !ATR.matchesType(S.Context, Ex->getType())) { 23786fcd932dfd6835f70cc00d6f7c6789793f6d7b66Hans Wennborg ScanfSpecifier fixedFS = FS; 23796fcd932dfd6835f70cc00d6f7c6789793f6d7b66Hans Wennborg bool success = fixedFS.fixType(Ex->getType(), S.getLangOptions()); 23806fcd932dfd6835f70cc00d6f7c6789793f6d7b66Hans Wennborg 23816fcd932dfd6835f70cc00d6f7c6789793f6d7b66Hans Wennborg if (success) { 23826fcd932dfd6835f70cc00d6f7c6789793f6d7b66Hans Wennborg // Get the fix string from the fixed format specifier. 23836fcd932dfd6835f70cc00d6f7c6789793f6d7b66Hans Wennborg llvm::SmallString<128> buf; 23846fcd932dfd6835f70cc00d6f7c6789793f6d7b66Hans Wennborg llvm::raw_svector_ostream os(buf); 23856fcd932dfd6835f70cc00d6f7c6789793f6d7b66Hans Wennborg fixedFS.toString(os); 23866fcd932dfd6835f70cc00d6f7c6789793f6d7b66Hans Wennborg 23876fcd932dfd6835f70cc00d6f7c6789793f6d7b66Hans Wennborg EmitFormatDiagnostic( 23886fcd932dfd6835f70cc00d6f7c6789793f6d7b66Hans Wennborg S.PDiag(diag::warn_printf_conversion_argument_type_mismatch) 23896fcd932dfd6835f70cc00d6f7c6789793f6d7b66Hans Wennborg << ATR.getRepresentativeTypeName(S.Context) << Ex->getType() 23906fcd932dfd6835f70cc00d6f7c6789793f6d7b66Hans Wennborg << Ex->getSourceRange(), 23916fcd932dfd6835f70cc00d6f7c6789793f6d7b66Hans Wennborg getLocationOfByte(CS.getStart()), 23926fcd932dfd6835f70cc00d6f7c6789793f6d7b66Hans Wennborg /*IsStringLocation*/true, 23936fcd932dfd6835f70cc00d6f7c6789793f6d7b66Hans Wennborg getSpecifierRange(startSpecifier, specifierLen), 23946fcd932dfd6835f70cc00d6f7c6789793f6d7b66Hans Wennborg FixItHint::CreateReplacement( 23956fcd932dfd6835f70cc00d6f7c6789793f6d7b66Hans Wennborg getSpecifierRange(startSpecifier, specifierLen), 23966fcd932dfd6835f70cc00d6f7c6789793f6d7b66Hans Wennborg os.str())); 23976fcd932dfd6835f70cc00d6f7c6789793f6d7b66Hans Wennborg } else { 23986fcd932dfd6835f70cc00d6f7c6789793f6d7b66Hans Wennborg S.Diag(getLocationOfByte(CS.getStart()), 23996fcd932dfd6835f70cc00d6f7c6789793f6d7b66Hans Wennborg diag::warn_printf_conversion_argument_type_mismatch) 24006fcd932dfd6835f70cc00d6f7c6789793f6d7b66Hans Wennborg << ATR.getRepresentativeTypeName(S.Context) << Ex->getType() 24016fcd932dfd6835f70cc00d6f7c6789793f6d7b66Hans Wennborg << getSpecifierRange(startSpecifier, specifierLen) 24026fcd932dfd6835f70cc00d6f7c6789793f6d7b66Hans Wennborg << Ex->getSourceRange(); 24036fcd932dfd6835f70cc00d6f7c6789793f6d7b66Hans Wennborg } 24046fcd932dfd6835f70cc00d6f7c6789793f6d7b66Hans Wennborg } 24056fcd932dfd6835f70cc00d6f7c6789793f6d7b66Hans Wennborg 2406826a3457f737f1fc45a22954fd1bfde38160c165Ted Kremenek return true; 240707d161f38e708a91486bf1c031d525faebbb249dTed Kremenek} 2408e0e5313c25f3870d0d18fc67e1b3a3a0e1ef8e07Ted Kremenek 2409826a3457f737f1fc45a22954fd1bfde38160c165Ted Kremenekvoid Sema::CheckFormatString(const StringLiteral *FExpr, 24100e5675de2b67eeca754754ae8d3dacba425a38e8Ted Kremenek const Expr *OrigFormatExpr, 24110e5675de2b67eeca754754ae8d3dacba425a38e8Ted Kremenek const CallExpr *TheCall, bool HasVAListArg, 2412826a3457f737f1fc45a22954fd1bfde38160c165Ted Kremenek unsigned format_idx, unsigned firstDataArg, 241355733de16f492dadbf5f4d2809d6c610ba6d86aeRichard Trieu bool isPrintf, bool inFunctionCall) { 2414826a3457f737f1fc45a22954fd1bfde38160c165Ted Kremenek 2415e0e5313c25f3870d0d18fc67e1b3a3a0e1ef8e07Ted Kremenek // CHECK: is the format string a wide literal? 24165cee1195584fa8672253139c86e922daeda69b9eDouglas Gregor if (!FExpr->isAscii()) { 241755733de16f492dadbf5f4d2809d6c610ba6d86aeRichard Trieu CheckFormatHandler::EmitFormatDiagnostic( 241855733de16f492dadbf5f4d2809d6c610ba6d86aeRichard Trieu *this, inFunctionCall, TheCall->getArg(format_idx), 241955733de16f492dadbf5f4d2809d6c610ba6d86aeRichard Trieu PDiag(diag::warn_format_string_is_wide_literal), FExpr->getLocStart(), 242055733de16f492dadbf5f4d2809d6c610ba6d86aeRichard Trieu /*IsStringLocation*/true, OrigFormatExpr->getSourceRange()); 2421e0e5313c25f3870d0d18fc67e1b3a3a0e1ef8e07Ted Kremenek return; 2422e0e5313c25f3870d0d18fc67e1b3a3a0e1ef8e07Ted Kremenek } 2423826a3457f737f1fc45a22954fd1bfde38160c165Ted Kremenek 2424e0e5313c25f3870d0d18fc67e1b3a3a0e1ef8e07Ted Kremenek // Str - The format string. NOTE: this is NOT null-terminated! 24255f9e272e632e951b1efe824cd16acb4d96077930Chris Lattner StringRef StrRef = FExpr->getString(); 24262f4eaef37476ae6891ede8ba215d0f6fd093629bBenjamin Kramer const char *Str = StrRef.data(); 24272f4eaef37476ae6891ede8ba215d0f6fd093629bBenjamin Kramer unsigned StrLen = StrRef.size(); 24284cd5791f4aa6deb572979bb38c1deedbc155efe0Ted Kremenek const unsigned numDataArgs = TheCall->getNumArgs() - firstDataArg; 2429826a3457f737f1fc45a22954fd1bfde38160c165Ted Kremenek 2430e0e5313c25f3870d0d18fc67e1b3a3a0e1ef8e07Ted Kremenek // CHECK: empty format string? 24314cd5791f4aa6deb572979bb38c1deedbc155efe0Ted Kremenek if (StrLen == 0 && numDataArgs > 0) { 243255733de16f492dadbf5f4d2809d6c610ba6d86aeRichard Trieu CheckFormatHandler::EmitFormatDiagnostic( 243355733de16f492dadbf5f4d2809d6c610ba6d86aeRichard Trieu *this, inFunctionCall, TheCall->getArg(format_idx), 243455733de16f492dadbf5f4d2809d6c610ba6d86aeRichard Trieu PDiag(diag::warn_empty_format_string), FExpr->getLocStart(), 243555733de16f492dadbf5f4d2809d6c610ba6d86aeRichard Trieu /*IsStringLocation*/true, OrigFormatExpr->getSourceRange()); 2436e0e5313c25f3870d0d18fc67e1b3a3a0e1ef8e07Ted Kremenek return; 2437e0e5313c25f3870d0d18fc67e1b3a3a0e1ef8e07Ted Kremenek } 2438826a3457f737f1fc45a22954fd1bfde38160c165Ted Kremenek 2439826a3457f737f1fc45a22954fd1bfde38160c165Ted Kremenek if (isPrintf) { 2440826a3457f737f1fc45a22954fd1bfde38160c165Ted Kremenek CheckPrintfHandler H(*this, FExpr, OrigFormatExpr, firstDataArg, 24414cd5791f4aa6deb572979bb38c1deedbc155efe0Ted Kremenek numDataArgs, isa<ObjCStringLiteral>(OrigFormatExpr), 244255733de16f492dadbf5f4d2809d6c610ba6d86aeRichard Trieu Str, HasVAListArg, TheCall, format_idx, 244355733de16f492dadbf5f4d2809d6c610ba6d86aeRichard Trieu inFunctionCall); 2444826a3457f737f1fc45a22954fd1bfde38160c165Ted Kremenek 2445826a3457f737f1fc45a22954fd1bfde38160c165Ted Kremenek if (!analyze_format_string::ParsePrintfString(H, Str, Str + StrLen)) 2446826a3457f737f1fc45a22954fd1bfde38160c165Ted Kremenek H.DoneProcessing(); 2447826a3457f737f1fc45a22954fd1bfde38160c165Ted Kremenek } 2448826a3457f737f1fc45a22954fd1bfde38160c165Ted Kremenek else { 2449826a3457f737f1fc45a22954fd1bfde38160c165Ted Kremenek CheckScanfHandler H(*this, FExpr, OrigFormatExpr, firstDataArg, 24504cd5791f4aa6deb572979bb38c1deedbc155efe0Ted Kremenek numDataArgs, isa<ObjCStringLiteral>(OrigFormatExpr), 245155733de16f492dadbf5f4d2809d6c610ba6d86aeRichard Trieu Str, HasVAListArg, TheCall, format_idx, 245255733de16f492dadbf5f4d2809d6c610ba6d86aeRichard Trieu inFunctionCall); 2453826a3457f737f1fc45a22954fd1bfde38160c165Ted Kremenek 2454826a3457f737f1fc45a22954fd1bfde38160c165Ted Kremenek if (!analyze_format_string::ParseScanfString(H, Str, Str + StrLen)) 2455826a3457f737f1fc45a22954fd1bfde38160c165Ted Kremenek H.DoneProcessing(); 2456826a3457f737f1fc45a22954fd1bfde38160c165Ted Kremenek } 2457ce7024e8a3793b05861a4904ecdb1272924ada14Ted Kremenek} 2458ce7024e8a3793b05861a4904ecdb1272924ada14Ted Kremenek 24597ccc95bceebb2d1c8fbe277c9e33bde7dc1ccbb1Chandler Carruth//===--- CHECK: Standard memory functions ---------------------------------===// 24607ccc95bceebb2d1c8fbe277c9e33bde7dc1ccbb1Chandler Carruth 24612a053a33707eba9e642adedb557b1a6aace103b5Douglas Gregor/// \brief Determine whether the given type is a dynamic class type (e.g., 24622a053a33707eba9e642adedb557b1a6aace103b5Douglas Gregor/// whether it has a vtable). 24632a053a33707eba9e642adedb557b1a6aace103b5Douglas Gregorstatic bool isDynamicClassType(QualType T) { 24642a053a33707eba9e642adedb557b1a6aace103b5Douglas Gregor if (CXXRecordDecl *Record = T->getAsCXXRecordDecl()) 24652a053a33707eba9e642adedb557b1a6aace103b5Douglas Gregor if (CXXRecordDecl *Definition = Record->getDefinition()) 24662a053a33707eba9e642adedb557b1a6aace103b5Douglas Gregor if (Definition->isDynamicClass()) 24672a053a33707eba9e642adedb557b1a6aace103b5Douglas Gregor return true; 24682a053a33707eba9e642adedb557b1a6aace103b5Douglas Gregor 24692a053a33707eba9e642adedb557b1a6aace103b5Douglas Gregor return false; 24702a053a33707eba9e642adedb557b1a6aace103b5Douglas Gregor} 24712a053a33707eba9e642adedb557b1a6aace103b5Douglas Gregor 2472a72a12f3baed07f2663e48c5fc3b670c68dffe0cChandler Carruth/// \brief If E is a sizeof expression, returns its argument expression, 2473000d428347f352979e0f6dffcf0a64e73af0a2b5Chandler Carruth/// otherwise returns NULL. 2474000d428347f352979e0f6dffcf0a64e73af0a2b5Chandler Carruthstatic const Expr *getSizeOfExprArg(const Expr* E) { 2475e4a1c64700304459ac436fe29cb498f2da3b6194Nico Weber if (const UnaryExprOrTypeTraitExpr *SizeOf = 2476000d428347f352979e0f6dffcf0a64e73af0a2b5Chandler Carruth dyn_cast<UnaryExprOrTypeTraitExpr>(E)) 2477000d428347f352979e0f6dffcf0a64e73af0a2b5Chandler Carruth if (SizeOf->getKind() == clang::UETT_SizeOf && !SizeOf->isArgumentType()) 2478000d428347f352979e0f6dffcf0a64e73af0a2b5Chandler Carruth return SizeOf->getArgumentExpr()->IgnoreParenImpCasts(); 2479e4a1c64700304459ac436fe29cb498f2da3b6194Nico Weber 2480000d428347f352979e0f6dffcf0a64e73af0a2b5Chandler Carruth return 0; 2481000d428347f352979e0f6dffcf0a64e73af0a2b5Chandler Carruth} 2482000d428347f352979e0f6dffcf0a64e73af0a2b5Chandler Carruth 2483a72a12f3baed07f2663e48c5fc3b670c68dffe0cChandler Carruth/// \brief If E is a sizeof expression, returns its argument type. 2484000d428347f352979e0f6dffcf0a64e73af0a2b5Chandler Carruthstatic QualType getSizeOfArgType(const Expr* E) { 2485000d428347f352979e0f6dffcf0a64e73af0a2b5Chandler Carruth if (const UnaryExprOrTypeTraitExpr *SizeOf = 2486000d428347f352979e0f6dffcf0a64e73af0a2b5Chandler Carruth dyn_cast<UnaryExprOrTypeTraitExpr>(E)) 2487000d428347f352979e0f6dffcf0a64e73af0a2b5Chandler Carruth if (SizeOf->getKind() == clang::UETT_SizeOf) 2488000d428347f352979e0f6dffcf0a64e73af0a2b5Chandler Carruth return SizeOf->getTypeOfArgument(); 2489000d428347f352979e0f6dffcf0a64e73af0a2b5Chandler Carruth 2490000d428347f352979e0f6dffcf0a64e73af0a2b5Chandler Carruth return QualType(); 2491e4a1c64700304459ac436fe29cb498f2da3b6194Nico Weber} 2492e4a1c64700304459ac436fe29cb498f2da3b6194Nico Weber 24937ccc95bceebb2d1c8fbe277c9e33bde7dc1ccbb1Chandler Carruth/// \brief Check for dangerous or invalid arguments to memset(). 24947ccc95bceebb2d1c8fbe277c9e33bde7dc1ccbb1Chandler Carruth/// 2495929f0135ab60166202f52e0dd19835c0490d792aChandler Carruth/// This issues warnings on known problematic, dangerous or unspecified 2496cc2f30c4ed7770b6005bd55b529a55c1fcc250fcMatt Beaumont-Gay/// arguments to the standard 'memset', 'memcpy', 'memmove', and 'memcmp' 2497cc2f30c4ed7770b6005bd55b529a55c1fcc250fcMatt Beaumont-Gay/// function calls. 24987ccc95bceebb2d1c8fbe277c9e33bde7dc1ccbb1Chandler Carruth/// 24997ccc95bceebb2d1c8fbe277c9e33bde7dc1ccbb1Chandler Carruth/// \param Call The call expression to diagnose. 2500cc2f30c4ed7770b6005bd55b529a55c1fcc250fcMatt Beaumont-Gayvoid Sema::CheckMemaccessArguments(const CallExpr *Call, 2501cc2f30c4ed7770b6005bd55b529a55c1fcc250fcMatt Beaumont-Gay CheckedMemoryFunction CMF, 2502cc2f30c4ed7770b6005bd55b529a55c1fcc250fcMatt Beaumont-Gay IdentifierInfo *FnName) { 25031d59f7f8fb39fa44ddbb6e2abd321af863b1f55bTed Kremenek // It is possible to have a non-standard definition of memset. Validate 2504707a23e8b87410332b55bb4534fa1c799edef38aDouglas Gregor // we have enough arguments, and if not, abort further checking. 2505cda57822327499aeb6fe606f9cf5903cffca3444Nico Weber unsigned ExpectedNumArgs = (CMF == CMF_Strndup ? 2 : 3); 2506cda57822327499aeb6fe606f9cf5903cffca3444Nico Weber if (Call->getNumArgs() < ExpectedNumArgs) 25071d59f7f8fb39fa44ddbb6e2abd321af863b1f55bTed Kremenek return; 25081d59f7f8fb39fa44ddbb6e2abd321af863b1f55bTed Kremenek 2509cda57822327499aeb6fe606f9cf5903cffca3444Nico Weber unsigned LastArg = (CMF == CMF_Memset || CMF == CMF_Strndup ? 1 : 2); 2510cda57822327499aeb6fe606f9cf5903cffca3444Nico Weber unsigned LenArg = (CMF == CMF_Strndup ? 1 : 2); 2511cda57822327499aeb6fe606f9cf5903cffca3444Nico Weber const Expr *LenExpr = Call->getArg(LenArg)->IgnoreParenImpCasts(); 2512000d428347f352979e0f6dffcf0a64e73af0a2b5Chandler Carruth 2513000d428347f352979e0f6dffcf0a64e73af0a2b5Chandler Carruth // We have special checking when the length is a sizeof expression. 2514000d428347f352979e0f6dffcf0a64e73af0a2b5Chandler Carruth QualType SizeOfArgTy = getSizeOfArgType(LenExpr); 2515000d428347f352979e0f6dffcf0a64e73af0a2b5Chandler Carruth const Expr *SizeOfArg = getSizeOfExprArg(LenExpr); 2516000d428347f352979e0f6dffcf0a64e73af0a2b5Chandler Carruth llvm::FoldingSetNodeID SizeOfArgID; 2517000d428347f352979e0f6dffcf0a64e73af0a2b5Chandler Carruth 251806bc9eb9908e42696775b395b290827bde468c8bDouglas Gregor for (unsigned ArgIdx = 0; ArgIdx != LastArg; ++ArgIdx) { 251906bc9eb9908e42696775b395b290827bde468c8bDouglas Gregor const Expr *Dest = Call->getArg(ArgIdx)->IgnoreParenImpCasts(); 2520e4a1c64700304459ac436fe29cb498f2da3b6194Nico Weber SourceRange ArgRange = Call->getArg(ArgIdx)->getSourceRange(); 252106bc9eb9908e42696775b395b290827bde468c8bDouglas Gregor 252206bc9eb9908e42696775b395b290827bde468c8bDouglas Gregor QualType DestTy = Dest->getType(); 252306bc9eb9908e42696775b395b290827bde468c8bDouglas Gregor if (const PointerType *DestPtrTy = DestTy->getAs<PointerType>()) { 252406bc9eb9908e42696775b395b290827bde468c8bDouglas Gregor QualType PointeeTy = DestPtrTy->getPointeeType(); 2525f85e193739c953358c865005855253af4f68a497John McCall 2526000d428347f352979e0f6dffcf0a64e73af0a2b5Chandler Carruth // Never warn about void type pointers. This can be used to suppress 2527000d428347f352979e0f6dffcf0a64e73af0a2b5Chandler Carruth // false positives. 2528000d428347f352979e0f6dffcf0a64e73af0a2b5Chandler Carruth if (PointeeTy->isVoidType()) 252906bc9eb9908e42696775b395b290827bde468c8bDouglas Gregor continue; 253006bc9eb9908e42696775b395b290827bde468c8bDouglas Gregor 2531000d428347f352979e0f6dffcf0a64e73af0a2b5Chandler Carruth // Catch "memset(p, 0, sizeof(p))" -- needs to be sizeof(*p). Do this by 2532000d428347f352979e0f6dffcf0a64e73af0a2b5Chandler Carruth // actually comparing the expressions for equality. Because computing the 2533000d428347f352979e0f6dffcf0a64e73af0a2b5Chandler Carruth // expression IDs can be expensive, we only do this if the diagnostic is 2534000d428347f352979e0f6dffcf0a64e73af0a2b5Chandler Carruth // enabled. 2535000d428347f352979e0f6dffcf0a64e73af0a2b5Chandler Carruth if (SizeOfArg && 2536000d428347f352979e0f6dffcf0a64e73af0a2b5Chandler Carruth Diags.getDiagnosticLevel(diag::warn_sizeof_pointer_expr_memaccess, 2537000d428347f352979e0f6dffcf0a64e73af0a2b5Chandler Carruth SizeOfArg->getExprLoc())) { 2538000d428347f352979e0f6dffcf0a64e73af0a2b5Chandler Carruth // We only compute IDs for expressions if the warning is enabled, and 2539000d428347f352979e0f6dffcf0a64e73af0a2b5Chandler Carruth // cache the sizeof arg's ID. 2540000d428347f352979e0f6dffcf0a64e73af0a2b5Chandler Carruth if (SizeOfArgID == llvm::FoldingSetNodeID()) 2541000d428347f352979e0f6dffcf0a64e73af0a2b5Chandler Carruth SizeOfArg->Profile(SizeOfArgID, Context, true); 2542000d428347f352979e0f6dffcf0a64e73af0a2b5Chandler Carruth llvm::FoldingSetNodeID DestID; 2543000d428347f352979e0f6dffcf0a64e73af0a2b5Chandler Carruth Dest->Profile(DestID, Context, true); 2544000d428347f352979e0f6dffcf0a64e73af0a2b5Chandler Carruth if (DestID == SizeOfArgID) { 2545cda57822327499aeb6fe606f9cf5903cffca3444Nico Weber // TODO: For strncpy() and friends, this could suggest sizeof(dst) 2546cda57822327499aeb6fe606f9cf5903cffca3444Nico Weber // over sizeof(src) as well. 2547000d428347f352979e0f6dffcf0a64e73af0a2b5Chandler Carruth unsigned ActionIdx = 0; // Default is to suggest dereferencing. 2548000d428347f352979e0f6dffcf0a64e73af0a2b5Chandler Carruth if (const UnaryOperator *UnaryOp = dyn_cast<UnaryOperator>(Dest)) 2549000d428347f352979e0f6dffcf0a64e73af0a2b5Chandler Carruth if (UnaryOp->getOpcode() == UO_AddrOf) 2550000d428347f352979e0f6dffcf0a64e73af0a2b5Chandler Carruth ActionIdx = 1; // If its an address-of operator, just remove it. 2551000d428347f352979e0f6dffcf0a64e73af0a2b5Chandler Carruth if (Context.getTypeSize(PointeeTy) == Context.getCharWidth()) 2552000d428347f352979e0f6dffcf0a64e73af0a2b5Chandler Carruth ActionIdx = 2; // If the pointee's size is sizeof(char), 2553000d428347f352979e0f6dffcf0a64e73af0a2b5Chandler Carruth // suggest an explicit length. 2554cda57822327499aeb6fe606f9cf5903cffca3444Nico Weber unsigned DestSrcSelect = (CMF == CMF_Strndup ? 1 : ArgIdx); 2555000d428347f352979e0f6dffcf0a64e73af0a2b5Chandler Carruth DiagRuntimeBehavior(SizeOfArg->getExprLoc(), Dest, 2556000d428347f352979e0f6dffcf0a64e73af0a2b5Chandler Carruth PDiag(diag::warn_sizeof_pointer_expr_memaccess) 2557cda57822327499aeb6fe606f9cf5903cffca3444Nico Weber << FnName << DestSrcSelect << ActionIdx 2558000d428347f352979e0f6dffcf0a64e73af0a2b5Chandler Carruth << Dest->getSourceRange() 2559000d428347f352979e0f6dffcf0a64e73af0a2b5Chandler Carruth << SizeOfArg->getSourceRange()); 2560000d428347f352979e0f6dffcf0a64e73af0a2b5Chandler Carruth break; 2561000d428347f352979e0f6dffcf0a64e73af0a2b5Chandler Carruth } 2562000d428347f352979e0f6dffcf0a64e73af0a2b5Chandler Carruth } 2563000d428347f352979e0f6dffcf0a64e73af0a2b5Chandler Carruth 2564000d428347f352979e0f6dffcf0a64e73af0a2b5Chandler Carruth // Also check for cases where the sizeof argument is the exact same 2565000d428347f352979e0f6dffcf0a64e73af0a2b5Chandler Carruth // type as the memory argument, and where it points to a user-defined 2566000d428347f352979e0f6dffcf0a64e73af0a2b5Chandler Carruth // record type. 2567000d428347f352979e0f6dffcf0a64e73af0a2b5Chandler Carruth if (SizeOfArgTy != QualType()) { 2568000d428347f352979e0f6dffcf0a64e73af0a2b5Chandler Carruth if (PointeeTy->isRecordType() && 2569000d428347f352979e0f6dffcf0a64e73af0a2b5Chandler Carruth Context.typesAreCompatible(SizeOfArgTy, DestTy)) { 2570000d428347f352979e0f6dffcf0a64e73af0a2b5Chandler Carruth DiagRuntimeBehavior(LenExpr->getExprLoc(), Dest, 2571000d428347f352979e0f6dffcf0a64e73af0a2b5Chandler Carruth PDiag(diag::warn_sizeof_pointer_type_memaccess) 2572000d428347f352979e0f6dffcf0a64e73af0a2b5Chandler Carruth << FnName << SizeOfArgTy << ArgIdx 2573000d428347f352979e0f6dffcf0a64e73af0a2b5Chandler Carruth << PointeeTy << Dest->getSourceRange() 2574000d428347f352979e0f6dffcf0a64e73af0a2b5Chandler Carruth << LenExpr->getSourceRange()); 2575000d428347f352979e0f6dffcf0a64e73af0a2b5Chandler Carruth break; 2576000d428347f352979e0f6dffcf0a64e73af0a2b5Chandler Carruth } 2577e4a1c64700304459ac436fe29cb498f2da3b6194Nico Weber } 2578e4a1c64700304459ac436fe29cb498f2da3b6194Nico Weber 257906bc9eb9908e42696775b395b290827bde468c8bDouglas Gregor // Always complain about dynamic classes. 2580f85e193739c953358c865005855253af4f68a497John McCall if (isDynamicClassType(PointeeTy)) 25815c5218e188b39b2e93b541156a69ef061e11aab8Matt Beaumont-Gay DiagRuntimeBehavior( 25825c5218e188b39b2e93b541156a69ef061e11aab8Matt Beaumont-Gay Dest->getExprLoc(), Dest, 25835c5218e188b39b2e93b541156a69ef061e11aab8Matt Beaumont-Gay PDiag(diag::warn_dyn_class_memaccess) 25845c5218e188b39b2e93b541156a69ef061e11aab8Matt Beaumont-Gay << (CMF == CMF_Memcmp ? ArgIdx + 2 : ArgIdx) << FnName << PointeeTy 25855c5218e188b39b2e93b541156a69ef061e11aab8Matt Beaumont-Gay // "overwritten" if we're warning about the destination for any call 25865c5218e188b39b2e93b541156a69ef061e11aab8Matt Beaumont-Gay // but memcmp; otherwise a verb appropriate to the call. 25875c5218e188b39b2e93b541156a69ef061e11aab8Matt Beaumont-Gay << (ArgIdx == 0 && CMF != CMF_Memcmp ? 0 : (unsigned)CMF) 25885c5218e188b39b2e93b541156a69ef061e11aab8Matt Beaumont-Gay << Call->getCallee()->getSourceRange()); 2589707a23e8b87410332b55bb4534fa1c799edef38aDouglas Gregor else if (PointeeTy.hasNonTrivialObjCLifetime() && CMF != CMF_Memset) 25905c5218e188b39b2e93b541156a69ef061e11aab8Matt Beaumont-Gay DiagRuntimeBehavior( 25915c5218e188b39b2e93b541156a69ef061e11aab8Matt Beaumont-Gay Dest->getExprLoc(), Dest, 25925c5218e188b39b2e93b541156a69ef061e11aab8Matt Beaumont-Gay PDiag(diag::warn_arc_object_memaccess) 25935c5218e188b39b2e93b541156a69ef061e11aab8Matt Beaumont-Gay << ArgIdx << FnName << PointeeTy 25945c5218e188b39b2e93b541156a69ef061e11aab8Matt Beaumont-Gay << Call->getCallee()->getSourceRange()); 2595f85e193739c953358c865005855253af4f68a497John McCall else 259606bc9eb9908e42696775b395b290827bde468c8bDouglas Gregor continue; 2597f85e193739c953358c865005855253af4f68a497John McCall 2598f85e193739c953358c865005855253af4f68a497John McCall DiagRuntimeBehavior( 2599f85e193739c953358c865005855253af4f68a497John McCall Dest->getExprLoc(), Dest, 2600929f0135ab60166202f52e0dd19835c0490d792aChandler Carruth PDiag(diag::note_bad_memaccess_silence) 260106bc9eb9908e42696775b395b290827bde468c8bDouglas Gregor << FixItHint::CreateInsertion(ArgRange.getBegin(), "(void*)")); 260206bc9eb9908e42696775b395b290827bde468c8bDouglas Gregor break; 260306bc9eb9908e42696775b395b290827bde468c8bDouglas Gregor } 26047ccc95bceebb2d1c8fbe277c9e33bde7dc1ccbb1Chandler Carruth } 26057ccc95bceebb2d1c8fbe277c9e33bde7dc1ccbb1Chandler Carruth} 26067ccc95bceebb2d1c8fbe277c9e33bde7dc1ccbb1Chandler Carruth 2607bd5da9d1a711e90b3bc265b4798954085c0b48d9Ted Kremenek// A little helper routine: ignore addition and subtraction of integer literals. 2608bd5da9d1a711e90b3bc265b4798954085c0b48d9Ted Kremenek// This intentionally does not ignore all integer constant expressions because 2609bd5da9d1a711e90b3bc265b4798954085c0b48d9Ted Kremenek// we don't want to remove sizeof(). 2610bd5da9d1a711e90b3bc265b4798954085c0b48d9Ted Kremenekstatic const Expr *ignoreLiteralAdditions(const Expr *Ex, ASTContext &Ctx) { 2611bd5da9d1a711e90b3bc265b4798954085c0b48d9Ted Kremenek Ex = Ex->IgnoreParenCasts(); 2612bd5da9d1a711e90b3bc265b4798954085c0b48d9Ted Kremenek 2613bd5da9d1a711e90b3bc265b4798954085c0b48d9Ted Kremenek for (;;) { 2614bd5da9d1a711e90b3bc265b4798954085c0b48d9Ted Kremenek const BinaryOperator * BO = dyn_cast<BinaryOperator>(Ex); 2615bd5da9d1a711e90b3bc265b4798954085c0b48d9Ted Kremenek if (!BO || !BO->isAdditiveOp()) 2616bd5da9d1a711e90b3bc265b4798954085c0b48d9Ted Kremenek break; 2617bd5da9d1a711e90b3bc265b4798954085c0b48d9Ted Kremenek 2618bd5da9d1a711e90b3bc265b4798954085c0b48d9Ted Kremenek const Expr *RHS = BO->getRHS()->IgnoreParenCasts(); 2619bd5da9d1a711e90b3bc265b4798954085c0b48d9Ted Kremenek const Expr *LHS = BO->getLHS()->IgnoreParenCasts(); 2620bd5da9d1a711e90b3bc265b4798954085c0b48d9Ted Kremenek 2621bd5da9d1a711e90b3bc265b4798954085c0b48d9Ted Kremenek if (isa<IntegerLiteral>(RHS)) 2622bd5da9d1a711e90b3bc265b4798954085c0b48d9Ted Kremenek Ex = LHS; 2623bd5da9d1a711e90b3bc265b4798954085c0b48d9Ted Kremenek else if (isa<IntegerLiteral>(LHS)) 2624bd5da9d1a711e90b3bc265b4798954085c0b48d9Ted Kremenek Ex = RHS; 2625bd5da9d1a711e90b3bc265b4798954085c0b48d9Ted Kremenek else 2626bd5da9d1a711e90b3bc265b4798954085c0b48d9Ted Kremenek break; 2627bd5da9d1a711e90b3bc265b4798954085c0b48d9Ted Kremenek } 2628bd5da9d1a711e90b3bc265b4798954085c0b48d9Ted Kremenek 2629bd5da9d1a711e90b3bc265b4798954085c0b48d9Ted Kremenek return Ex; 2630bd5da9d1a711e90b3bc265b4798954085c0b48d9Ted Kremenek} 2631bd5da9d1a711e90b3bc265b4798954085c0b48d9Ted Kremenek 2632bd5da9d1a711e90b3bc265b4798954085c0b48d9Ted Kremenek// Warn if the user has made the 'size' argument to strlcpy or strlcat 2633bd5da9d1a711e90b3bc265b4798954085c0b48d9Ted Kremenek// be the size of the source, instead of the destination. 2634bd5da9d1a711e90b3bc265b4798954085c0b48d9Ted Kremenekvoid Sema::CheckStrlcpycatArguments(const CallExpr *Call, 2635bd5da9d1a711e90b3bc265b4798954085c0b48d9Ted Kremenek IdentifierInfo *FnName) { 2636bd5da9d1a711e90b3bc265b4798954085c0b48d9Ted Kremenek 2637bd5da9d1a711e90b3bc265b4798954085c0b48d9Ted Kremenek // Don't crash if the user has the wrong number of arguments 2638bd5da9d1a711e90b3bc265b4798954085c0b48d9Ted Kremenek if (Call->getNumArgs() != 3) 2639bd5da9d1a711e90b3bc265b4798954085c0b48d9Ted Kremenek return; 2640bd5da9d1a711e90b3bc265b4798954085c0b48d9Ted Kremenek 2641bd5da9d1a711e90b3bc265b4798954085c0b48d9Ted Kremenek const Expr *SrcArg = ignoreLiteralAdditions(Call->getArg(1), Context); 2642bd5da9d1a711e90b3bc265b4798954085c0b48d9Ted Kremenek const Expr *SizeArg = ignoreLiteralAdditions(Call->getArg(2), Context); 2643bd5da9d1a711e90b3bc265b4798954085c0b48d9Ted Kremenek const Expr *CompareWithSrc = NULL; 2644bd5da9d1a711e90b3bc265b4798954085c0b48d9Ted Kremenek 2645bd5da9d1a711e90b3bc265b4798954085c0b48d9Ted Kremenek // Look for 'strlcpy(dst, x, sizeof(x))' 2646bd5da9d1a711e90b3bc265b4798954085c0b48d9Ted Kremenek if (const Expr *Ex = getSizeOfExprArg(SizeArg)) 2647bd5da9d1a711e90b3bc265b4798954085c0b48d9Ted Kremenek CompareWithSrc = Ex; 2648bd5da9d1a711e90b3bc265b4798954085c0b48d9Ted Kremenek else { 2649bd5da9d1a711e90b3bc265b4798954085c0b48d9Ted Kremenek // Look for 'strlcpy(dst, x, strlen(x))' 2650bd5da9d1a711e90b3bc265b4798954085c0b48d9Ted Kremenek if (const CallExpr *SizeCall = dyn_cast<CallExpr>(SizeArg)) { 2651180f47959a066795cc0f409433023af448bb0328Richard Smith if (SizeCall->isBuiltinCall() == Builtin::BIstrlen 2652bd5da9d1a711e90b3bc265b4798954085c0b48d9Ted Kremenek && SizeCall->getNumArgs() == 1) 2653bd5da9d1a711e90b3bc265b4798954085c0b48d9Ted Kremenek CompareWithSrc = ignoreLiteralAdditions(SizeCall->getArg(0), Context); 2654bd5da9d1a711e90b3bc265b4798954085c0b48d9Ted Kremenek } 2655bd5da9d1a711e90b3bc265b4798954085c0b48d9Ted Kremenek } 2656bd5da9d1a711e90b3bc265b4798954085c0b48d9Ted Kremenek 2657bd5da9d1a711e90b3bc265b4798954085c0b48d9Ted Kremenek if (!CompareWithSrc) 2658bd5da9d1a711e90b3bc265b4798954085c0b48d9Ted Kremenek return; 2659bd5da9d1a711e90b3bc265b4798954085c0b48d9Ted Kremenek 2660bd5da9d1a711e90b3bc265b4798954085c0b48d9Ted Kremenek // Determine if the argument to sizeof/strlen is equal to the source 2661bd5da9d1a711e90b3bc265b4798954085c0b48d9Ted Kremenek // argument. In principle there's all kinds of things you could do 2662bd5da9d1a711e90b3bc265b4798954085c0b48d9Ted Kremenek // here, for instance creating an == expression and evaluating it with 2663bd5da9d1a711e90b3bc265b4798954085c0b48d9Ted Kremenek // EvaluateAsBooleanCondition, but this uses a more direct technique: 2664bd5da9d1a711e90b3bc265b4798954085c0b48d9Ted Kremenek const DeclRefExpr *SrcArgDRE = dyn_cast<DeclRefExpr>(SrcArg); 2665bd5da9d1a711e90b3bc265b4798954085c0b48d9Ted Kremenek if (!SrcArgDRE) 2666bd5da9d1a711e90b3bc265b4798954085c0b48d9Ted Kremenek return; 2667bd5da9d1a711e90b3bc265b4798954085c0b48d9Ted Kremenek 2668bd5da9d1a711e90b3bc265b4798954085c0b48d9Ted Kremenek const DeclRefExpr *CompareWithSrcDRE = dyn_cast<DeclRefExpr>(CompareWithSrc); 2669bd5da9d1a711e90b3bc265b4798954085c0b48d9Ted Kremenek if (!CompareWithSrcDRE || 2670bd5da9d1a711e90b3bc265b4798954085c0b48d9Ted Kremenek SrcArgDRE->getDecl() != CompareWithSrcDRE->getDecl()) 2671bd5da9d1a711e90b3bc265b4798954085c0b48d9Ted Kremenek return; 2672bd5da9d1a711e90b3bc265b4798954085c0b48d9Ted Kremenek 2673bd5da9d1a711e90b3bc265b4798954085c0b48d9Ted Kremenek const Expr *OriginalSizeArg = Call->getArg(2); 2674bd5da9d1a711e90b3bc265b4798954085c0b48d9Ted Kremenek Diag(CompareWithSrcDRE->getLocStart(), diag::warn_strlcpycat_wrong_size) 2675bd5da9d1a711e90b3bc265b4798954085c0b48d9Ted Kremenek << OriginalSizeArg->getSourceRange() << FnName; 2676bd5da9d1a711e90b3bc265b4798954085c0b48d9Ted Kremenek 2677bd5da9d1a711e90b3bc265b4798954085c0b48d9Ted Kremenek // Output a FIXIT hint if the destination is an array (rather than a 2678bd5da9d1a711e90b3bc265b4798954085c0b48d9Ted Kremenek // pointer to an array). This could be enhanced to handle some 2679bd5da9d1a711e90b3bc265b4798954085c0b48d9Ted Kremenek // pointers if we know the actual size, like if DstArg is 'array+2' 2680bd5da9d1a711e90b3bc265b4798954085c0b48d9Ted Kremenek // we could say 'sizeof(array)-2'. 2681bd5da9d1a711e90b3bc265b4798954085c0b48d9Ted Kremenek const Expr *DstArg = Call->getArg(0)->IgnoreParenImpCasts(); 26828f7462237ff542a4556775f98709ed300aa1731aTed Kremenek QualType DstArgTy = DstArg->getType(); 2683bd5da9d1a711e90b3bc265b4798954085c0b48d9Ted Kremenek 26848f7462237ff542a4556775f98709ed300aa1731aTed Kremenek // Only handle constant-sized or VLAs, but not flexible members. 26858f7462237ff542a4556775f98709ed300aa1731aTed Kremenek if (const ConstantArrayType *CAT = Context.getAsConstantArrayType(DstArgTy)) { 26868f7462237ff542a4556775f98709ed300aa1731aTed Kremenek // Only issue the FIXIT for arrays of size > 1. 26878f7462237ff542a4556775f98709ed300aa1731aTed Kremenek if (CAT->getSize().getSExtValue() <= 1) 26888f7462237ff542a4556775f98709ed300aa1731aTed Kremenek return; 26898f7462237ff542a4556775f98709ed300aa1731aTed Kremenek } else if (!DstArgTy->isVariableArrayType()) { 26908f7462237ff542a4556775f98709ed300aa1731aTed Kremenek return; 2691bd5da9d1a711e90b3bc265b4798954085c0b48d9Ted Kremenek } 26928f7462237ff542a4556775f98709ed300aa1731aTed Kremenek 26938f7462237ff542a4556775f98709ed300aa1731aTed Kremenek llvm::SmallString<128> sizeString; 26948f7462237ff542a4556775f98709ed300aa1731aTed Kremenek llvm::raw_svector_ostream OS(sizeString); 26958f7462237ff542a4556775f98709ed300aa1731aTed Kremenek OS << "sizeof("; 26968987b2385d9ba63ada66e1344ace79b04d5cb5c3Douglas Gregor DstArg->printPretty(OS, Context, 0, getPrintingPolicy()); 26978f7462237ff542a4556775f98709ed300aa1731aTed Kremenek OS << ")"; 26988f7462237ff542a4556775f98709ed300aa1731aTed Kremenek 26998f7462237ff542a4556775f98709ed300aa1731aTed Kremenek Diag(OriginalSizeArg->getLocStart(), diag::note_strlcpycat_wrong_size) 27008f7462237ff542a4556775f98709ed300aa1731aTed Kremenek << FixItHint::CreateReplacement(OriginalSizeArg->getSourceRange(), 27018f7462237ff542a4556775f98709ed300aa1731aTed Kremenek OS.str()); 2702bd5da9d1a711e90b3bc265b4798954085c0b48d9Ted Kremenek} 2703bd5da9d1a711e90b3bc265b4798954085c0b48d9Ted Kremenek 270406de276fff91264437fa75111ed76de43097e089Ted Kremenek//===--- CHECK: Return Address of Stack Variable --------------------------===// 270506de276fff91264437fa75111ed76de43097e089Ted Kremenek 27065f9e272e632e951b1efe824cd16acb4d96077930Chris Lattnerstatic Expr *EvalVal(Expr *E, SmallVectorImpl<DeclRefExpr *> &refVars); 27075f9e272e632e951b1efe824cd16acb4d96077930Chris Lattnerstatic Expr *EvalAddr(Expr* E, SmallVectorImpl<DeclRefExpr *> &refVars); 270806de276fff91264437fa75111ed76de43097e089Ted Kremenek 270906de276fff91264437fa75111ed76de43097e089Ted Kremenek/// CheckReturnStackAddr - Check if a return statement returns the address 271006de276fff91264437fa75111ed76de43097e089Ted Kremenek/// of a stack variable. 271106de276fff91264437fa75111ed76de43097e089Ted Kremenekvoid 271206de276fff91264437fa75111ed76de43097e089Ted KremenekSema::CheckReturnStackAddr(Expr *RetValExp, QualType lhsType, 271306de276fff91264437fa75111ed76de43097e089Ted Kremenek SourceLocation ReturnLoc) { 27141eb4433ac451dc16f4133a88af2d002ac26c58efMike Stump 271526e10bea3d2e9d2979194890e51b98ecea165a96Argyrios Kyrtzidis Expr *stackE = 0; 27165f9e272e632e951b1efe824cd16acb4d96077930Chris Lattner SmallVector<DeclRefExpr *, 8> refVars; 27174e4b30ec62d78b24e6556fea2624855c193d0e3eTed Kremenek 271826e10bea3d2e9d2979194890e51b98ecea165a96Argyrios Kyrtzidis // Perform checking for returned stack addresses, local blocks, 271926e10bea3d2e9d2979194890e51b98ecea165a96Argyrios Kyrtzidis // label addresses or references to temporaries. 2720f85e193739c953358c865005855253af4f68a497John McCall if (lhsType->isPointerType() || 2721f85e193739c953358c865005855253af4f68a497John McCall (!getLangOptions().ObjCAutoRefCount && lhsType->isBlockPointerType())) { 272226e10bea3d2e9d2979194890e51b98ecea165a96Argyrios Kyrtzidis stackE = EvalAddr(RetValExp, refVars); 2723ac5fc7c6bcb494b60fee7ce615ac931c5db6135eMike Stump } else if (lhsType->isReferenceType()) { 272426e10bea3d2e9d2979194890e51b98ecea165a96Argyrios Kyrtzidis stackE = EvalVal(RetValExp, refVars); 272526e10bea3d2e9d2979194890e51b98ecea165a96Argyrios Kyrtzidis } 272626e10bea3d2e9d2979194890e51b98ecea165a96Argyrios Kyrtzidis 272726e10bea3d2e9d2979194890e51b98ecea165a96Argyrios Kyrtzidis if (stackE == 0) 272826e10bea3d2e9d2979194890e51b98ecea165a96Argyrios Kyrtzidis return; // Nothing suspicious was found. 272926e10bea3d2e9d2979194890e51b98ecea165a96Argyrios Kyrtzidis 273026e10bea3d2e9d2979194890e51b98ecea165a96Argyrios Kyrtzidis SourceLocation diagLoc; 273126e10bea3d2e9d2979194890e51b98ecea165a96Argyrios Kyrtzidis SourceRange diagRange; 273226e10bea3d2e9d2979194890e51b98ecea165a96Argyrios Kyrtzidis if (refVars.empty()) { 273326e10bea3d2e9d2979194890e51b98ecea165a96Argyrios Kyrtzidis diagLoc = stackE->getLocStart(); 273426e10bea3d2e9d2979194890e51b98ecea165a96Argyrios Kyrtzidis diagRange = stackE->getSourceRange(); 273526e10bea3d2e9d2979194890e51b98ecea165a96Argyrios Kyrtzidis } else { 273626e10bea3d2e9d2979194890e51b98ecea165a96Argyrios Kyrtzidis // We followed through a reference variable. 'stackE' contains the 273726e10bea3d2e9d2979194890e51b98ecea165a96Argyrios Kyrtzidis // problematic expression but we will warn at the return statement pointing 273826e10bea3d2e9d2979194890e51b98ecea165a96Argyrios Kyrtzidis // at the reference variable. We will later display the "trail" of 273926e10bea3d2e9d2979194890e51b98ecea165a96Argyrios Kyrtzidis // reference variables using notes. 274026e10bea3d2e9d2979194890e51b98ecea165a96Argyrios Kyrtzidis diagLoc = refVars[0]->getLocStart(); 274126e10bea3d2e9d2979194890e51b98ecea165a96Argyrios Kyrtzidis diagRange = refVars[0]->getSourceRange(); 274226e10bea3d2e9d2979194890e51b98ecea165a96Argyrios Kyrtzidis } 274326e10bea3d2e9d2979194890e51b98ecea165a96Argyrios Kyrtzidis 274426e10bea3d2e9d2979194890e51b98ecea165a96Argyrios Kyrtzidis if (DeclRefExpr *DR = dyn_cast<DeclRefExpr>(stackE)) { //address of local var. 274526e10bea3d2e9d2979194890e51b98ecea165a96Argyrios Kyrtzidis Diag(diagLoc, lhsType->isReferenceType() ? diag::warn_ret_stack_ref 274626e10bea3d2e9d2979194890e51b98ecea165a96Argyrios Kyrtzidis : diag::warn_ret_stack_addr) 274726e10bea3d2e9d2979194890e51b98ecea165a96Argyrios Kyrtzidis << DR->getDecl()->getDeclName() << diagRange; 274826e10bea3d2e9d2979194890e51b98ecea165a96Argyrios Kyrtzidis } else if (isa<BlockExpr>(stackE)) { // local block. 274926e10bea3d2e9d2979194890e51b98ecea165a96Argyrios Kyrtzidis Diag(diagLoc, diag::err_ret_local_block) << diagRange; 275026e10bea3d2e9d2979194890e51b98ecea165a96Argyrios Kyrtzidis } else if (isa<AddrLabelExpr>(stackE)) { // address of label. 275126e10bea3d2e9d2979194890e51b98ecea165a96Argyrios Kyrtzidis Diag(diagLoc, diag::warn_ret_addr_label) << diagRange; 275226e10bea3d2e9d2979194890e51b98ecea165a96Argyrios Kyrtzidis } else { // local temporary. 275326e10bea3d2e9d2979194890e51b98ecea165a96Argyrios Kyrtzidis Diag(diagLoc, lhsType->isReferenceType() ? diag::warn_ret_local_temp_ref 275426e10bea3d2e9d2979194890e51b98ecea165a96Argyrios Kyrtzidis : diag::warn_ret_local_temp_addr) 275526e10bea3d2e9d2979194890e51b98ecea165a96Argyrios Kyrtzidis << diagRange; 275626e10bea3d2e9d2979194890e51b98ecea165a96Argyrios Kyrtzidis } 275726e10bea3d2e9d2979194890e51b98ecea165a96Argyrios Kyrtzidis 275826e10bea3d2e9d2979194890e51b98ecea165a96Argyrios Kyrtzidis // Display the "trail" of reference variables that we followed until we 275926e10bea3d2e9d2979194890e51b98ecea165a96Argyrios Kyrtzidis // found the problematic expression using notes. 276026e10bea3d2e9d2979194890e51b98ecea165a96Argyrios Kyrtzidis for (unsigned i = 0, e = refVars.size(); i != e; ++i) { 276126e10bea3d2e9d2979194890e51b98ecea165a96Argyrios Kyrtzidis VarDecl *VD = cast<VarDecl>(refVars[i]->getDecl()); 276226e10bea3d2e9d2979194890e51b98ecea165a96Argyrios Kyrtzidis // If this var binds to another reference var, show the range of the next 276326e10bea3d2e9d2979194890e51b98ecea165a96Argyrios Kyrtzidis // var, otherwise the var binds to the problematic expression, in which case 276426e10bea3d2e9d2979194890e51b98ecea165a96Argyrios Kyrtzidis // show the range of the expression. 276526e10bea3d2e9d2979194890e51b98ecea165a96Argyrios Kyrtzidis SourceRange range = (i < e-1) ? refVars[i+1]->getSourceRange() 276626e10bea3d2e9d2979194890e51b98ecea165a96Argyrios Kyrtzidis : stackE->getSourceRange(); 276726e10bea3d2e9d2979194890e51b98ecea165a96Argyrios Kyrtzidis Diag(VD->getLocation(), diag::note_ref_var_local_bind) 276826e10bea3d2e9d2979194890e51b98ecea165a96Argyrios Kyrtzidis << VD->getDeclName() << range; 276906de276fff91264437fa75111ed76de43097e089Ted Kremenek } 277006de276fff91264437fa75111ed76de43097e089Ted Kremenek} 277106de276fff91264437fa75111ed76de43097e089Ted Kremenek 277206de276fff91264437fa75111ed76de43097e089Ted Kremenek/// EvalAddr - EvalAddr and EvalVal are mutually recursive functions that 277306de276fff91264437fa75111ed76de43097e089Ted Kremenek/// check if the expression in a return statement evaluates to an address 277426e10bea3d2e9d2979194890e51b98ecea165a96Argyrios Kyrtzidis/// to a location on the stack, a local block, an address of a label, or a 277526e10bea3d2e9d2979194890e51b98ecea165a96Argyrios Kyrtzidis/// reference to local temporary. The recursion is used to traverse the 277606de276fff91264437fa75111ed76de43097e089Ted Kremenek/// AST of the return expression, with recursion backtracking when we 277726e10bea3d2e9d2979194890e51b98ecea165a96Argyrios Kyrtzidis/// encounter a subexpression that (1) clearly does not lead to one of the 277826e10bea3d2e9d2979194890e51b98ecea165a96Argyrios Kyrtzidis/// above problematic expressions (2) is something we cannot determine leads to 277926e10bea3d2e9d2979194890e51b98ecea165a96Argyrios Kyrtzidis/// a problematic expression based on such local checking. 278026e10bea3d2e9d2979194890e51b98ecea165a96Argyrios Kyrtzidis/// 278126e10bea3d2e9d2979194890e51b98ecea165a96Argyrios Kyrtzidis/// Both EvalAddr and EvalVal follow through reference variables to evaluate 278226e10bea3d2e9d2979194890e51b98ecea165a96Argyrios Kyrtzidis/// the expression that they point to. Such variables are added to the 278326e10bea3d2e9d2979194890e51b98ecea165a96Argyrios Kyrtzidis/// 'refVars' vector so that we know what the reference variable "trail" was. 278406de276fff91264437fa75111ed76de43097e089Ted Kremenek/// 2785e8c600f9fedf2cfd69cdd2cb4bde4a9b39ce2873Ted Kremenek/// EvalAddr processes expressions that are pointers that are used as 2786e8c600f9fedf2cfd69cdd2cb4bde4a9b39ce2873Ted Kremenek/// references (and not L-values). EvalVal handles all other values. 278726e10bea3d2e9d2979194890e51b98ecea165a96Argyrios Kyrtzidis/// At the base case of the recursion is a check for the above problematic 278826e10bea3d2e9d2979194890e51b98ecea165a96Argyrios Kyrtzidis/// expressions. 278906de276fff91264437fa75111ed76de43097e089Ted Kremenek/// 279006de276fff91264437fa75111ed76de43097e089Ted Kremenek/// This implementation handles: 279106de276fff91264437fa75111ed76de43097e089Ted Kremenek/// 279206de276fff91264437fa75111ed76de43097e089Ted Kremenek/// * pointer-to-pointer casts 279306de276fff91264437fa75111ed76de43097e089Ted Kremenek/// * implicit conversions from array references to pointers 279406de276fff91264437fa75111ed76de43097e089Ted Kremenek/// * taking the address of fields 279506de276fff91264437fa75111ed76de43097e089Ted Kremenek/// * arbitrary interplay between "&" and "*" operators 279606de276fff91264437fa75111ed76de43097e089Ted Kremenek/// * pointer arithmetic from an address of a stack variable 279706de276fff91264437fa75111ed76de43097e089Ted Kremenek/// * taking the address of an array element where the array is on the stack 27985f9e272e632e951b1efe824cd16acb4d96077930Chris Lattnerstatic Expr *EvalAddr(Expr *E, SmallVectorImpl<DeclRefExpr *> &refVars) { 279926e10bea3d2e9d2979194890e51b98ecea165a96Argyrios Kyrtzidis if (E->isTypeDependent()) 280026e10bea3d2e9d2979194890e51b98ecea165a96Argyrios Kyrtzidis return NULL; 280126e10bea3d2e9d2979194890e51b98ecea165a96Argyrios Kyrtzidis 280206de276fff91264437fa75111ed76de43097e089Ted Kremenek // We should only be called for evaluating pointer expressions. 28030f436560640a1cff5b6d96f80f540770f139453fDavid Chisnall assert((E->getType()->isAnyPointerType() || 2804dd972f20dc2bd3609d833893e5c6544ac09b59a9Steve Naroff E->getType()->isBlockPointerType() || 2805a526c5c67e5a0473c340903ee542ce570119665fTed Kremenek E->getType()->isObjCQualifiedIdType()) && 2806fae3f1f6565c74d3238747b58357a6e56fbb0e9cChris Lattner "EvalAddr only works on pointers"); 28071eb4433ac451dc16f4133a88af2d002ac26c58efMike Stump 2808f111d935722ed488144600cea5ed03a6b5069e8fPeter Collingbourne E = E->IgnoreParens(); 2809f111d935722ed488144600cea5ed03a6b5069e8fPeter Collingbourne 281006de276fff91264437fa75111ed76de43097e089Ted Kremenek // Our "symbolic interpreter" is just a dispatch off the currently 281106de276fff91264437fa75111ed76de43097e089Ted Kremenek // viewed AST node. We then recursively traverse the AST by calling 281206de276fff91264437fa75111ed76de43097e089Ted Kremenek // EvalAddr and EvalVal appropriately. 281306de276fff91264437fa75111ed76de43097e089Ted Kremenek switch (E->getStmtClass()) { 281426e10bea3d2e9d2979194890e51b98ecea165a96Argyrios Kyrtzidis case Stmt::DeclRefExprClass: { 281526e10bea3d2e9d2979194890e51b98ecea165a96Argyrios Kyrtzidis DeclRefExpr *DR = cast<DeclRefExpr>(E); 281626e10bea3d2e9d2979194890e51b98ecea165a96Argyrios Kyrtzidis 281726e10bea3d2e9d2979194890e51b98ecea165a96Argyrios Kyrtzidis if (VarDecl *V = dyn_cast<VarDecl>(DR->getDecl())) 281826e10bea3d2e9d2979194890e51b98ecea165a96Argyrios Kyrtzidis // If this is a reference variable, follow through to the expression that 281926e10bea3d2e9d2979194890e51b98ecea165a96Argyrios Kyrtzidis // it points to. 282026e10bea3d2e9d2979194890e51b98ecea165a96Argyrios Kyrtzidis if (V->hasLocalStorage() && 282126e10bea3d2e9d2979194890e51b98ecea165a96Argyrios Kyrtzidis V->getType()->isReferenceType() && V->hasInit()) { 282226e10bea3d2e9d2979194890e51b98ecea165a96Argyrios Kyrtzidis // Add the reference variable to the "trail". 282326e10bea3d2e9d2979194890e51b98ecea165a96Argyrios Kyrtzidis refVars.push_back(DR); 282426e10bea3d2e9d2979194890e51b98ecea165a96Argyrios Kyrtzidis return EvalAddr(V->getInit(), refVars); 282526e10bea3d2e9d2979194890e51b98ecea165a96Argyrios Kyrtzidis } 282626e10bea3d2e9d2979194890e51b98ecea165a96Argyrios Kyrtzidis 282726e10bea3d2e9d2979194890e51b98ecea165a96Argyrios Kyrtzidis return NULL; 282826e10bea3d2e9d2979194890e51b98ecea165a96Argyrios Kyrtzidis } 282906de276fff91264437fa75111ed76de43097e089Ted Kremenek 2830fae3f1f6565c74d3238747b58357a6e56fbb0e9cChris Lattner case Stmt::UnaryOperatorClass: { 2831fae3f1f6565c74d3238747b58357a6e56fbb0e9cChris Lattner // The only unary operator that make sense to handle here 2832fae3f1f6565c74d3238747b58357a6e56fbb0e9cChris Lattner // is AddrOf. All others don't make sense as pointers. 2833fae3f1f6565c74d3238747b58357a6e56fbb0e9cChris Lattner UnaryOperator *U = cast<UnaryOperator>(E); 28341eb4433ac451dc16f4133a88af2d002ac26c58efMike Stump 28352de56d1d0c3a504ad1529de2677628bdfbb95cd4John McCall if (U->getOpcode() == UO_AddrOf) 283626e10bea3d2e9d2979194890e51b98ecea165a96Argyrios Kyrtzidis return EvalVal(U->getSubExpr(), refVars); 2837fae3f1f6565c74d3238747b58357a6e56fbb0e9cChris Lattner else 2838fae3f1f6565c74d3238747b58357a6e56fbb0e9cChris Lattner return NULL; 2839fae3f1f6565c74d3238747b58357a6e56fbb0e9cChris Lattner } 28401eb4433ac451dc16f4133a88af2d002ac26c58efMike Stump 2841fae3f1f6565c74d3238747b58357a6e56fbb0e9cChris Lattner case Stmt::BinaryOperatorClass: { 2842fae3f1f6565c74d3238747b58357a6e56fbb0e9cChris Lattner // Handle pointer arithmetic. All other binary operators are not valid 2843fae3f1f6565c74d3238747b58357a6e56fbb0e9cChris Lattner // in this context. 2844fae3f1f6565c74d3238747b58357a6e56fbb0e9cChris Lattner BinaryOperator *B = cast<BinaryOperator>(E); 28452de56d1d0c3a504ad1529de2677628bdfbb95cd4John McCall BinaryOperatorKind op = B->getOpcode(); 28461eb4433ac451dc16f4133a88af2d002ac26c58efMike Stump 28472de56d1d0c3a504ad1529de2677628bdfbb95cd4John McCall if (op != BO_Add && op != BO_Sub) 2848fae3f1f6565c74d3238747b58357a6e56fbb0e9cChris Lattner return NULL; 28491eb4433ac451dc16f4133a88af2d002ac26c58efMike Stump 2850fae3f1f6565c74d3238747b58357a6e56fbb0e9cChris Lattner Expr *Base = B->getLHS(); 28513907323dd6665c0c4e383435cb145233f4533406Anders Carlsson 2852fae3f1f6565c74d3238747b58357a6e56fbb0e9cChris Lattner // Determine which argument is the real pointer base. It could be 2853fae3f1f6565c74d3238747b58357a6e56fbb0e9cChris Lattner // the RHS argument instead of the LHS. 2854fae3f1f6565c74d3238747b58357a6e56fbb0e9cChris Lattner if (!Base->getType()->isPointerType()) Base = B->getRHS(); 28551eb4433ac451dc16f4133a88af2d002ac26c58efMike Stump 2856fae3f1f6565c74d3238747b58357a6e56fbb0e9cChris Lattner assert (Base->getType()->isPointerType()); 285726e10bea3d2e9d2979194890e51b98ecea165a96Argyrios Kyrtzidis return EvalAddr(Base, refVars); 2858fae3f1f6565c74d3238747b58357a6e56fbb0e9cChris Lattner } 285961f40a2b67fc2046768e14f66b617e564cbcc3d8Steve Naroff 2860fae3f1f6565c74d3238747b58357a6e56fbb0e9cChris Lattner // For conditional operators we need to see if either the LHS or RHS are 2861fae3f1f6565c74d3238747b58357a6e56fbb0e9cChris Lattner // valid DeclRefExpr*s. If one of them is valid, we return it. 2862fae3f1f6565c74d3238747b58357a6e56fbb0e9cChris Lattner case Stmt::ConditionalOperatorClass: { 2863fae3f1f6565c74d3238747b58357a6e56fbb0e9cChris Lattner ConditionalOperator *C = cast<ConditionalOperator>(E); 28641eb4433ac451dc16f4133a88af2d002ac26c58efMike Stump 2865fae3f1f6565c74d3238747b58357a6e56fbb0e9cChris Lattner // Handle the GNU extension for missing LHS. 28669ee5ee84f0ad8246bff105786a128c7a909fdf12Douglas Gregor if (Expr *lhsExpr = C->getLHS()) { 28679ee5ee84f0ad8246bff105786a128c7a909fdf12Douglas Gregor // In C++, we can have a throw-expression, which has 'void' type. 28689ee5ee84f0ad8246bff105786a128c7a909fdf12Douglas Gregor if (!lhsExpr->getType()->isVoidType()) 286926e10bea3d2e9d2979194890e51b98ecea165a96Argyrios Kyrtzidis if (Expr* LHS = EvalAddr(lhsExpr, refVars)) 28709ee5ee84f0ad8246bff105786a128c7a909fdf12Douglas Gregor return LHS; 28719ee5ee84f0ad8246bff105786a128c7a909fdf12Douglas Gregor } 28729ee5ee84f0ad8246bff105786a128c7a909fdf12Douglas Gregor 28739ee5ee84f0ad8246bff105786a128c7a909fdf12Douglas Gregor // In C++, we can have a throw-expression, which has 'void' type. 28749ee5ee84f0ad8246bff105786a128c7a909fdf12Douglas Gregor if (C->getRHS()->getType()->isVoidType()) 28759ee5ee84f0ad8246bff105786a128c7a909fdf12Douglas Gregor return NULL; 287606de276fff91264437fa75111ed76de43097e089Ted Kremenek 287726e10bea3d2e9d2979194890e51b98ecea165a96Argyrios Kyrtzidis return EvalAddr(C->getRHS(), refVars); 2878fae3f1f6565c74d3238747b58357a6e56fbb0e9cChris Lattner } 287926e10bea3d2e9d2979194890e51b98ecea165a96Argyrios Kyrtzidis 288026e10bea3d2e9d2979194890e51b98ecea165a96Argyrios Kyrtzidis case Stmt::BlockExprClass: 2881469a1eb996e1cb0be54f9b210f836afbddcbb2ccJohn McCall if (cast<BlockExpr>(E)->getBlockDecl()->hasCaptures()) 288226e10bea3d2e9d2979194890e51b98ecea165a96Argyrios Kyrtzidis return E; // local block. 288326e10bea3d2e9d2979194890e51b98ecea165a96Argyrios Kyrtzidis return NULL; 288426e10bea3d2e9d2979194890e51b98ecea165a96Argyrios Kyrtzidis 288526e10bea3d2e9d2979194890e51b98ecea165a96Argyrios Kyrtzidis case Stmt::AddrLabelExprClass: 288626e10bea3d2e9d2979194890e51b98ecea165a96Argyrios Kyrtzidis return E; // address of label. 28871eb4433ac451dc16f4133a88af2d002ac26c58efMike Stump 288880ee6e878a169e6255d4686a91bb696151ff229fJohn McCall case Stmt::ExprWithCleanupsClass: 288980ee6e878a169e6255d4686a91bb696151ff229fJohn McCall return EvalAddr(cast<ExprWithCleanups>(E)->getSubExpr(), refVars); 289080ee6e878a169e6255d4686a91bb696151ff229fJohn McCall 289154b5274f2c190331438375ad114dad12ae098b57Ted Kremenek // For casts, we need to handle conversions from arrays to 289254b5274f2c190331438375ad114dad12ae098b57Ted Kremenek // pointer values, and pointer-to-pointer conversions. 289349badde06e066d058d6c7fcf4e628a72999b65a9Douglas Gregor case Stmt::ImplicitCastExprClass: 28946eec8e883de118b431e3ead5b1e604a6ac68ff6bDouglas Gregor case Stmt::CStyleCastExprClass: 2895f85e193739c953358c865005855253af4f68a497John McCall case Stmt::CXXFunctionalCastExprClass: 2896f85e193739c953358c865005855253af4f68a497John McCall case Stmt::ObjCBridgedCastExprClass: { 28970835a3cdeefe714b4959d31127ea155e56393125Argyrios Kyrtzidis Expr* SubExpr = cast<CastExpr>(E)->getSubExpr(); 289854b5274f2c190331438375ad114dad12ae098b57Ted Kremenek QualType T = SubExpr->getType(); 28991eb4433ac451dc16f4133a88af2d002ac26c58efMike Stump 2900dd972f20dc2bd3609d833893e5c6544ac09b59a9Steve Naroff if (SubExpr->getType()->isPointerType() || 2901dd972f20dc2bd3609d833893e5c6544ac09b59a9Steve Naroff SubExpr->getType()->isBlockPointerType() || 2902dd972f20dc2bd3609d833893e5c6544ac09b59a9Steve Naroff SubExpr->getType()->isObjCQualifiedIdType()) 290326e10bea3d2e9d2979194890e51b98ecea165a96Argyrios Kyrtzidis return EvalAddr(SubExpr, refVars); 290454b5274f2c190331438375ad114dad12ae098b57Ted Kremenek else if (T->isArrayType()) 290526e10bea3d2e9d2979194890e51b98ecea165a96Argyrios Kyrtzidis return EvalVal(SubExpr, refVars); 2906fae3f1f6565c74d3238747b58357a6e56fbb0e9cChris Lattner else 290754b5274f2c190331438375ad114dad12ae098b57Ted Kremenek return 0; 2908fae3f1f6565c74d3238747b58357a6e56fbb0e9cChris Lattner } 29091eb4433ac451dc16f4133a88af2d002ac26c58efMike Stump 2910fae3f1f6565c74d3238747b58357a6e56fbb0e9cChris Lattner // C++ casts. For dynamic casts, static casts, and const casts, we 2911fae3f1f6565c74d3238747b58357a6e56fbb0e9cChris Lattner // are always converting from a pointer-to-pointer, so we just blow 291249badde06e066d058d6c7fcf4e628a72999b65a9Douglas Gregor // through the cast. In the case the dynamic cast doesn't fail (and 291349badde06e066d058d6c7fcf4e628a72999b65a9Douglas Gregor // return NULL), we take the conservative route and report cases 2914fae3f1f6565c74d3238747b58357a6e56fbb0e9cChris Lattner // where we return the address of a stack variable. For Reinterpre 291549badde06e066d058d6c7fcf4e628a72999b65a9Douglas Gregor // FIXME: The comment about is wrong; we're not always converting 291649badde06e066d058d6c7fcf4e628a72999b65a9Douglas Gregor // from pointer to pointer. I'm guessing that this code should also 29171eb4433ac451dc16f4133a88af2d002ac26c58efMike Stump // handle references to objects. 29181eb4433ac451dc16f4133a88af2d002ac26c58efMike Stump case Stmt::CXXStaticCastExprClass: 29191eb4433ac451dc16f4133a88af2d002ac26c58efMike Stump case Stmt::CXXDynamicCastExprClass: 292049badde06e066d058d6c7fcf4e628a72999b65a9Douglas Gregor case Stmt::CXXConstCastExprClass: 292149badde06e066d058d6c7fcf4e628a72999b65a9Douglas Gregor case Stmt::CXXReinterpretCastExprClass: { 292249badde06e066d058d6c7fcf4e628a72999b65a9Douglas Gregor Expr *S = cast<CXXNamedCastExpr>(E)->getSubExpr(); 2923dd972f20dc2bd3609d833893e5c6544ac09b59a9Steve Naroff if (S->getType()->isPointerType() || S->getType()->isBlockPointerType()) 292426e10bea3d2e9d2979194890e51b98ecea165a96Argyrios Kyrtzidis return EvalAddr(S, refVars); 292506de276fff91264437fa75111ed76de43097e089Ted Kremenek else 292606de276fff91264437fa75111ed76de43097e089Ted Kremenek return NULL; 2927fae3f1f6565c74d3238747b58357a6e56fbb0e9cChris Lattner } 29281eb4433ac451dc16f4133a88af2d002ac26c58efMike Stump 292903e80030515c800d1ab44125b9052dfffd1bd04cDouglas Gregor case Stmt::MaterializeTemporaryExprClass: 293003e80030515c800d1ab44125b9052dfffd1bd04cDouglas Gregor if (Expr *Result = EvalAddr( 293103e80030515c800d1ab44125b9052dfffd1bd04cDouglas Gregor cast<MaterializeTemporaryExpr>(E)->GetTemporaryExpr(), 293203e80030515c800d1ab44125b9052dfffd1bd04cDouglas Gregor refVars)) 293303e80030515c800d1ab44125b9052dfffd1bd04cDouglas Gregor return Result; 293403e80030515c800d1ab44125b9052dfffd1bd04cDouglas Gregor 293503e80030515c800d1ab44125b9052dfffd1bd04cDouglas Gregor return E; 293603e80030515c800d1ab44125b9052dfffd1bd04cDouglas Gregor 2937fae3f1f6565c74d3238747b58357a6e56fbb0e9cChris Lattner // Everything else: we simply don't reason about them. 2938fae3f1f6565c74d3238747b58357a6e56fbb0e9cChris Lattner default: 2939fae3f1f6565c74d3238747b58357a6e56fbb0e9cChris Lattner return NULL; 294006de276fff91264437fa75111ed76de43097e089Ted Kremenek } 294106de276fff91264437fa75111ed76de43097e089Ted Kremenek} 29421eb4433ac451dc16f4133a88af2d002ac26c58efMike Stump 294306de276fff91264437fa75111ed76de43097e089Ted Kremenek 294406de276fff91264437fa75111ed76de43097e089Ted Kremenek/// EvalVal - This function is complements EvalAddr in the mutual recursion. 294506de276fff91264437fa75111ed76de43097e089Ted Kremenek/// See the comments for EvalAddr for more details. 29465f9e272e632e951b1efe824cd16acb4d96077930Chris Lattnerstatic Expr *EvalVal(Expr *E, SmallVectorImpl<DeclRefExpr *> &refVars) { 294768957a919084ab8bbd1f01d534db1d6f31d0f459Ted Kremenekdo { 2948e8c600f9fedf2cfd69cdd2cb4bde4a9b39ce2873Ted Kremenek // We should only be called for evaluating non-pointer expressions, or 2949e8c600f9fedf2cfd69cdd2cb4bde4a9b39ce2873Ted Kremenek // expressions with a pointer type that are not used as references but instead 2950e8c600f9fedf2cfd69cdd2cb4bde4a9b39ce2873Ted Kremenek // are l-values (e.g., DeclRefExpr with a pointer type). 29511eb4433ac451dc16f4133a88af2d002ac26c58efMike Stump 295206de276fff91264437fa75111ed76de43097e089Ted Kremenek // Our "symbolic interpreter" is just a dispatch off the currently 295306de276fff91264437fa75111ed76de43097e089Ted Kremenek // viewed AST node. We then recursively traverse the AST by calling 295406de276fff91264437fa75111ed76de43097e089Ted Kremenek // EvalAddr and EvalVal appropriately. 2955f111d935722ed488144600cea5ed03a6b5069e8fPeter Collingbourne 2956f111d935722ed488144600cea5ed03a6b5069e8fPeter Collingbourne E = E->IgnoreParens(); 295706de276fff91264437fa75111ed76de43097e089Ted Kremenek switch (E->getStmtClass()) { 295868957a919084ab8bbd1f01d534db1d6f31d0f459Ted Kremenek case Stmt::ImplicitCastExprClass: { 295968957a919084ab8bbd1f01d534db1d6f31d0f459Ted Kremenek ImplicitCastExpr *IE = cast<ImplicitCastExpr>(E); 29605baba9d98364a3525d6afa15a04cdad82fd6dd30John McCall if (IE->getValueKind() == VK_LValue) { 296168957a919084ab8bbd1f01d534db1d6f31d0f459Ted Kremenek E = IE->getSubExpr(); 296268957a919084ab8bbd1f01d534db1d6f31d0f459Ted Kremenek continue; 296368957a919084ab8bbd1f01d534db1d6f31d0f459Ted Kremenek } 296468957a919084ab8bbd1f01d534db1d6f31d0f459Ted Kremenek return NULL; 296568957a919084ab8bbd1f01d534db1d6f31d0f459Ted Kremenek } 296668957a919084ab8bbd1f01d534db1d6f31d0f459Ted Kremenek 296780ee6e878a169e6255d4686a91bb696151ff229fJohn McCall case Stmt::ExprWithCleanupsClass: 296880ee6e878a169e6255d4686a91bb696151ff229fJohn McCall return EvalVal(cast<ExprWithCleanups>(E)->getSubExpr(), refVars); 296980ee6e878a169e6255d4686a91bb696151ff229fJohn McCall 2970a2813cec2605ce7878d1b13471d685f689b251afDouglas Gregor case Stmt::DeclRefExprClass: { 297126e10bea3d2e9d2979194890e51b98ecea165a96Argyrios Kyrtzidis // When we hit a DeclRefExpr we are looking at code that refers to a 297226e10bea3d2e9d2979194890e51b98ecea165a96Argyrios Kyrtzidis // variable's name. If it's not a reference variable we check if it has 297326e10bea3d2e9d2979194890e51b98ecea165a96Argyrios Kyrtzidis // local storage within the function, and if so, return the expression. 297406de276fff91264437fa75111ed76de43097e089Ted Kremenek DeclRefExpr *DR = cast<DeclRefExpr>(E); 29751eb4433ac451dc16f4133a88af2d002ac26c58efMike Stump 297606de276fff91264437fa75111ed76de43097e089Ted Kremenek if (VarDecl *V = dyn_cast<VarDecl>(DR->getDecl())) 297726e10bea3d2e9d2979194890e51b98ecea165a96Argyrios Kyrtzidis if (V->hasLocalStorage()) { 297826e10bea3d2e9d2979194890e51b98ecea165a96Argyrios Kyrtzidis if (!V->getType()->isReferenceType()) 297926e10bea3d2e9d2979194890e51b98ecea165a96Argyrios Kyrtzidis return DR; 298026e10bea3d2e9d2979194890e51b98ecea165a96Argyrios Kyrtzidis 298126e10bea3d2e9d2979194890e51b98ecea165a96Argyrios Kyrtzidis // Reference variable, follow through to the expression that 298226e10bea3d2e9d2979194890e51b98ecea165a96Argyrios Kyrtzidis // it points to. 298326e10bea3d2e9d2979194890e51b98ecea165a96Argyrios Kyrtzidis if (V->hasInit()) { 298426e10bea3d2e9d2979194890e51b98ecea165a96Argyrios Kyrtzidis // Add the reference variable to the "trail". 298526e10bea3d2e9d2979194890e51b98ecea165a96Argyrios Kyrtzidis refVars.push_back(DR); 298626e10bea3d2e9d2979194890e51b98ecea165a96Argyrios Kyrtzidis return EvalVal(V->getInit(), refVars); 298726e10bea3d2e9d2979194890e51b98ecea165a96Argyrios Kyrtzidis } 298826e10bea3d2e9d2979194890e51b98ecea165a96Argyrios Kyrtzidis } 29891eb4433ac451dc16f4133a88af2d002ac26c58efMike Stump 299006de276fff91264437fa75111ed76de43097e089Ted Kremenek return NULL; 299106de276fff91264437fa75111ed76de43097e089Ted Kremenek } 29921eb4433ac451dc16f4133a88af2d002ac26c58efMike Stump 299306de276fff91264437fa75111ed76de43097e089Ted Kremenek case Stmt::UnaryOperatorClass: { 299406de276fff91264437fa75111ed76de43097e089Ted Kremenek // The only unary operator that make sense to handle here 299506de276fff91264437fa75111ed76de43097e089Ted Kremenek // is Deref. All others don't resolve to a "name." This includes 299606de276fff91264437fa75111ed76de43097e089Ted Kremenek // handling all sorts of rvalues passed to a unary operator. 299706de276fff91264437fa75111ed76de43097e089Ted Kremenek UnaryOperator *U = cast<UnaryOperator>(E); 29981eb4433ac451dc16f4133a88af2d002ac26c58efMike Stump 29992de56d1d0c3a504ad1529de2677628bdfbb95cd4John McCall if (U->getOpcode() == UO_Deref) 300026e10bea3d2e9d2979194890e51b98ecea165a96Argyrios Kyrtzidis return EvalAddr(U->getSubExpr(), refVars); 300106de276fff91264437fa75111ed76de43097e089Ted Kremenek 300206de276fff91264437fa75111ed76de43097e089Ted Kremenek return NULL; 300306de276fff91264437fa75111ed76de43097e089Ted Kremenek } 30041eb4433ac451dc16f4133a88af2d002ac26c58efMike Stump 300506de276fff91264437fa75111ed76de43097e089Ted Kremenek case Stmt::ArraySubscriptExprClass: { 300606de276fff91264437fa75111ed76de43097e089Ted Kremenek // Array subscripts are potential references to data on the stack. We 300706de276fff91264437fa75111ed76de43097e089Ted Kremenek // retrieve the DeclRefExpr* for the array variable if it indeed 300806de276fff91264437fa75111ed76de43097e089Ted Kremenek // has local storage. 300926e10bea3d2e9d2979194890e51b98ecea165a96Argyrios Kyrtzidis return EvalAddr(cast<ArraySubscriptExpr>(E)->getBase(), refVars); 301006de276fff91264437fa75111ed76de43097e089Ted Kremenek } 30111eb4433ac451dc16f4133a88af2d002ac26c58efMike Stump 301206de276fff91264437fa75111ed76de43097e089Ted Kremenek case Stmt::ConditionalOperatorClass: { 301306de276fff91264437fa75111ed76de43097e089Ted Kremenek // For conditional operators we need to see if either the LHS or RHS are 301426e10bea3d2e9d2979194890e51b98ecea165a96Argyrios Kyrtzidis // non-NULL Expr's. If one is non-NULL, we return it. 301506de276fff91264437fa75111ed76de43097e089Ted Kremenek ConditionalOperator *C = cast<ConditionalOperator>(E); 301606de276fff91264437fa75111ed76de43097e089Ted Kremenek 30173907323dd6665c0c4e383435cb145233f4533406Anders Carlsson // Handle the GNU extension for missing LHS. 30183907323dd6665c0c4e383435cb145233f4533406Anders Carlsson if (Expr *lhsExpr = C->getLHS()) 301926e10bea3d2e9d2979194890e51b98ecea165a96Argyrios Kyrtzidis if (Expr *LHS = EvalVal(lhsExpr, refVars)) 30203907323dd6665c0c4e383435cb145233f4533406Anders Carlsson return LHS; 30213907323dd6665c0c4e383435cb145233f4533406Anders Carlsson 302226e10bea3d2e9d2979194890e51b98ecea165a96Argyrios Kyrtzidis return EvalVal(C->getRHS(), refVars); 302306de276fff91264437fa75111ed76de43097e089Ted Kremenek } 30241eb4433ac451dc16f4133a88af2d002ac26c58efMike Stump 302506de276fff91264437fa75111ed76de43097e089Ted Kremenek // Accesses to members are potential references to data on the stack. 302683f6faf37d9bf58986bedc9bc0ea897a56b4dbadDouglas Gregor case Stmt::MemberExprClass: { 302706de276fff91264437fa75111ed76de43097e089Ted Kremenek MemberExpr *M = cast<MemberExpr>(E); 30281eb4433ac451dc16f4133a88af2d002ac26c58efMike Stump 302906de276fff91264437fa75111ed76de43097e089Ted Kremenek // Check for indirect access. We only want direct field accesses. 3030a423e81a4d04b7c1882d2787d1189cbc14540c16Ted Kremenek if (M->isArrow()) 3031a423e81a4d04b7c1882d2787d1189cbc14540c16Ted Kremenek return NULL; 3032a423e81a4d04b7c1882d2787d1189cbc14540c16Ted Kremenek 3033a423e81a4d04b7c1882d2787d1189cbc14540c16Ted Kremenek // Check whether the member type is itself a reference, in which case 3034a423e81a4d04b7c1882d2787d1189cbc14540c16Ted Kremenek // we're not going to refer to the member, but to what the member refers to. 3035a423e81a4d04b7c1882d2787d1189cbc14540c16Ted Kremenek if (M->getMemberDecl()->getType()->isReferenceType()) 303606de276fff91264437fa75111ed76de43097e089Ted Kremenek return NULL; 3037a423e81a4d04b7c1882d2787d1189cbc14540c16Ted Kremenek 303826e10bea3d2e9d2979194890e51b98ecea165a96Argyrios Kyrtzidis return EvalVal(M->getBase(), refVars); 303906de276fff91264437fa75111ed76de43097e089Ted Kremenek } 30401eb4433ac451dc16f4133a88af2d002ac26c58efMike Stump 304103e80030515c800d1ab44125b9052dfffd1bd04cDouglas Gregor case Stmt::MaterializeTemporaryExprClass: 304203e80030515c800d1ab44125b9052dfffd1bd04cDouglas Gregor if (Expr *Result = EvalVal( 304303e80030515c800d1ab44125b9052dfffd1bd04cDouglas Gregor cast<MaterializeTemporaryExpr>(E)->GetTemporaryExpr(), 304403e80030515c800d1ab44125b9052dfffd1bd04cDouglas Gregor refVars)) 304503e80030515c800d1ab44125b9052dfffd1bd04cDouglas Gregor return Result; 304603e80030515c800d1ab44125b9052dfffd1bd04cDouglas Gregor 304703e80030515c800d1ab44125b9052dfffd1bd04cDouglas Gregor return E; 304803e80030515c800d1ab44125b9052dfffd1bd04cDouglas Gregor 304906de276fff91264437fa75111ed76de43097e089Ted Kremenek default: 305026e10bea3d2e9d2979194890e51b98ecea165a96Argyrios Kyrtzidis // Check that we don't return or take the address of a reference to a 305126e10bea3d2e9d2979194890e51b98ecea165a96Argyrios Kyrtzidis // temporary. This is only useful in C++. 305226e10bea3d2e9d2979194890e51b98ecea165a96Argyrios Kyrtzidis if (!E->isTypeDependent() && E->isRValue()) 305326e10bea3d2e9d2979194890e51b98ecea165a96Argyrios Kyrtzidis return E; 305426e10bea3d2e9d2979194890e51b98ecea165a96Argyrios Kyrtzidis 305526e10bea3d2e9d2979194890e51b98ecea165a96Argyrios Kyrtzidis // Everything else: we simply don't reason about them. 305606de276fff91264437fa75111ed76de43097e089Ted Kremenek return NULL; 305706de276fff91264437fa75111ed76de43097e089Ted Kremenek } 305868957a919084ab8bbd1f01d534db1d6f31d0f459Ted Kremenek} while (true); 305906de276fff91264437fa75111ed76de43097e089Ted Kremenek} 3060588e5ebee2db045c3611e0c8f601bc4495ebd0f3Ted Kremenek 3061588e5ebee2db045c3611e0c8f601bc4495ebd0f3Ted Kremenek//===--- CHECK: Floating-Point comparisons (-Wfloat-equal) ---------------===// 3062588e5ebee2db045c3611e0c8f601bc4495ebd0f3Ted Kremenek 3063588e5ebee2db045c3611e0c8f601bc4495ebd0f3Ted Kremenek/// Check for comparisons of floating point operands using != and ==. 3064588e5ebee2db045c3611e0c8f601bc4495ebd0f3Ted Kremenek/// Issue a warning if these are no self-comparisons, as they are not likely 3065588e5ebee2db045c3611e0c8f601bc4495ebd0f3Ted Kremenek/// to do what the programmer intended. 3066dd22509c82eb7681a0f46b41d61cb2e25a4d8fa1Richard Trieuvoid Sema::CheckFloatComparison(SourceLocation Loc, Expr* LHS, Expr *RHS) { 3067588e5ebee2db045c3611e0c8f601bc4495ebd0f3Ted Kremenek bool EmitWarning = true; 30681eb4433ac451dc16f4133a88af2d002ac26c58efMike Stump 3069dd22509c82eb7681a0f46b41d61cb2e25a4d8fa1Richard Trieu Expr* LeftExprSansParen = LHS->IgnoreParenImpCasts(); 3070dd22509c82eb7681a0f46b41d61cb2e25a4d8fa1Richard Trieu Expr* RightExprSansParen = RHS->IgnoreParenImpCasts(); 3071588e5ebee2db045c3611e0c8f601bc4495ebd0f3Ted Kremenek 3072588e5ebee2db045c3611e0c8f601bc4495ebd0f3Ted Kremenek // Special case: check for x == x (which is OK). 3073588e5ebee2db045c3611e0c8f601bc4495ebd0f3Ted Kremenek // Do not emit warnings for such cases. 3074588e5ebee2db045c3611e0c8f601bc4495ebd0f3Ted Kremenek if (DeclRefExpr* DRL = dyn_cast<DeclRefExpr>(LeftExprSansParen)) 3075588e5ebee2db045c3611e0c8f601bc4495ebd0f3Ted Kremenek if (DeclRefExpr* DRR = dyn_cast<DeclRefExpr>(RightExprSansParen)) 3076588e5ebee2db045c3611e0c8f601bc4495ebd0f3Ted Kremenek if (DRL->getDecl() == DRR->getDecl()) 3077588e5ebee2db045c3611e0c8f601bc4495ebd0f3Ted Kremenek EmitWarning = false; 30781eb4433ac451dc16f4133a88af2d002ac26c58efMike Stump 30791eb4433ac451dc16f4133a88af2d002ac26c58efMike Stump 30801b500bb0d40aa3ebf1ace47340bb5f401a9ae99cTed Kremenek // Special case: check for comparisons against literals that can be exactly 30811b500bb0d40aa3ebf1ace47340bb5f401a9ae99cTed Kremenek // represented by APFloat. In such cases, do not emit a warning. This 30821b500bb0d40aa3ebf1ace47340bb5f401a9ae99cTed Kremenek // is a heuristic: often comparison against such literals are used to 30831b500bb0d40aa3ebf1ace47340bb5f401a9ae99cTed Kremenek // detect if a value in a variable has not changed. This clearly can 30841b500bb0d40aa3ebf1ace47340bb5f401a9ae99cTed Kremenek // lead to false negatives. 30851b500bb0d40aa3ebf1ace47340bb5f401a9ae99cTed Kremenek if (EmitWarning) { 30861b500bb0d40aa3ebf1ace47340bb5f401a9ae99cTed Kremenek if (FloatingLiteral* FLL = dyn_cast<FloatingLiteral>(LeftExprSansParen)) { 30871b500bb0d40aa3ebf1ace47340bb5f401a9ae99cTed Kremenek if (FLL->isExact()) 30881b500bb0d40aa3ebf1ace47340bb5f401a9ae99cTed Kremenek EmitWarning = false; 3089ac5fc7c6bcb494b60fee7ce615ac931c5db6135eMike Stump } else 30901b500bb0d40aa3ebf1ace47340bb5f401a9ae99cTed Kremenek if (FloatingLiteral* FLR = dyn_cast<FloatingLiteral>(RightExprSansParen)){ 30911b500bb0d40aa3ebf1ace47340bb5f401a9ae99cTed Kremenek if (FLR->isExact()) 30921b500bb0d40aa3ebf1ace47340bb5f401a9ae99cTed Kremenek EmitWarning = false; 30931b500bb0d40aa3ebf1ace47340bb5f401a9ae99cTed Kremenek } 30941b500bb0d40aa3ebf1ace47340bb5f401a9ae99cTed Kremenek } 30951eb4433ac451dc16f4133a88af2d002ac26c58efMike Stump 3096588e5ebee2db045c3611e0c8f601bc4495ebd0f3Ted Kremenek // Check for comparisons with builtin types. 30970eb23307222bda7ad95d968eac4e1ab30864b213Sebastian Redl if (EmitWarning) 3098588e5ebee2db045c3611e0c8f601bc4495ebd0f3Ted Kremenek if (CallExpr* CL = dyn_cast<CallExpr>(LeftExprSansParen)) 3099180f47959a066795cc0f409433023af448bb0328Richard Smith if (CL->isBuiltinCall()) 3100588e5ebee2db045c3611e0c8f601bc4495ebd0f3Ted Kremenek EmitWarning = false; 31011eb4433ac451dc16f4133a88af2d002ac26c58efMike Stump 31020eb23307222bda7ad95d968eac4e1ab30864b213Sebastian Redl if (EmitWarning) 3103588e5ebee2db045c3611e0c8f601bc4495ebd0f3Ted Kremenek if (CallExpr* CR = dyn_cast<CallExpr>(RightExprSansParen)) 3104180f47959a066795cc0f409433023af448bb0328Richard Smith if (CR->isBuiltinCall()) 3105588e5ebee2db045c3611e0c8f601bc4495ebd0f3Ted Kremenek EmitWarning = false; 31061eb4433ac451dc16f4133a88af2d002ac26c58efMike Stump 3107588e5ebee2db045c3611e0c8f601bc4495ebd0f3Ted Kremenek // Emit the diagnostic. 3108588e5ebee2db045c3611e0c8f601bc4495ebd0f3Ted Kremenek if (EmitWarning) 3109dd22509c82eb7681a0f46b41d61cb2e25a4d8fa1Richard Trieu Diag(Loc, diag::warn_floatingpoint_eq) 3110dd22509c82eb7681a0f46b41d61cb2e25a4d8fa1Richard Trieu << LHS->getSourceRange() << RHS->getSourceRange(); 3111588e5ebee2db045c3611e0c8f601bc4495ebd0f3Ted Kremenek} 3112ba26e58c64b4f6233dfc4bcd3ef6ce83aab47ffcJohn McCall 3113f2370c9b4aade940e2253b5b33262ba507d1d71fJohn McCall//===--- CHECK: Integer mixed-sign comparisons (-Wsign-compare) --------===// 3114f2370c9b4aade940e2253b5b33262ba507d1d71fJohn McCall//===--- CHECK: Lossy implicit conversions (-Wconversion) --------------===// 3115ba26e58c64b4f6233dfc4bcd3ef6ce83aab47ffcJohn McCall 3116f2370c9b4aade940e2253b5b33262ba507d1d71fJohn McCallnamespace { 3117ba26e58c64b4f6233dfc4bcd3ef6ce83aab47ffcJohn McCall 3118f2370c9b4aade940e2253b5b33262ba507d1d71fJohn McCall/// Structure recording the 'active' range of an integer-valued 3119f2370c9b4aade940e2253b5b33262ba507d1d71fJohn McCall/// expression. 3120f2370c9b4aade940e2253b5b33262ba507d1d71fJohn McCallstruct IntRange { 3121f2370c9b4aade940e2253b5b33262ba507d1d71fJohn McCall /// The number of bits active in the int. 3122f2370c9b4aade940e2253b5b33262ba507d1d71fJohn McCall unsigned Width; 3123ba26e58c64b4f6233dfc4bcd3ef6ce83aab47ffcJohn McCall 3124f2370c9b4aade940e2253b5b33262ba507d1d71fJohn McCall /// True if the int is known not to have negative values. 3125f2370c9b4aade940e2253b5b33262ba507d1d71fJohn McCall bool NonNegative; 312651313c39c84407dd6a323be99a8c322bf8d052a9John McCall 3127f2370c9b4aade940e2253b5b33262ba507d1d71fJohn McCall IntRange(unsigned Width, bool NonNegative) 3128f2370c9b4aade940e2253b5b33262ba507d1d71fJohn McCall : Width(Width), NonNegative(NonNegative) 3129f2370c9b4aade940e2253b5b33262ba507d1d71fJohn McCall {} 313051313c39c84407dd6a323be99a8c322bf8d052a9John McCall 31311844a6e1074a5c1fd8eadac7fc7317c3e29d4653John McCall /// Returns the range of the bool type. 3132f2370c9b4aade940e2253b5b33262ba507d1d71fJohn McCall static IntRange forBoolType() { 3133f2370c9b4aade940e2253b5b33262ba507d1d71fJohn McCall return IntRange(1, true); 3134f2370c9b4aade940e2253b5b33262ba507d1d71fJohn McCall } 313551313c39c84407dd6a323be99a8c322bf8d052a9John McCall 31361844a6e1074a5c1fd8eadac7fc7317c3e29d4653John McCall /// Returns the range of an opaque value of the given integral type. 31371844a6e1074a5c1fd8eadac7fc7317c3e29d4653John McCall static IntRange forValueOfType(ASTContext &C, QualType T) { 31381844a6e1074a5c1fd8eadac7fc7317c3e29d4653John McCall return forValueOfCanonicalType(C, 31391844a6e1074a5c1fd8eadac7fc7317c3e29d4653John McCall T->getCanonicalTypeInternal().getTypePtr()); 314051313c39c84407dd6a323be99a8c322bf8d052a9John McCall } 314151313c39c84407dd6a323be99a8c322bf8d052a9John McCall 31421844a6e1074a5c1fd8eadac7fc7317c3e29d4653John McCall /// Returns the range of an opaque value of a canonical integral type. 31431844a6e1074a5c1fd8eadac7fc7317c3e29d4653John McCall static IntRange forValueOfCanonicalType(ASTContext &C, const Type *T) { 3144f2370c9b4aade940e2253b5b33262ba507d1d71fJohn McCall assert(T->isCanonicalUnqualified()); 314551313c39c84407dd6a323be99a8c322bf8d052a9John McCall 3146f2370c9b4aade940e2253b5b33262ba507d1d71fJohn McCall if (const VectorType *VT = dyn_cast<VectorType>(T)) 3147f2370c9b4aade940e2253b5b33262ba507d1d71fJohn McCall T = VT->getElementType().getTypePtr(); 3148f2370c9b4aade940e2253b5b33262ba507d1d71fJohn McCall if (const ComplexType *CT = dyn_cast<ComplexType>(T)) 3149f2370c9b4aade940e2253b5b33262ba507d1d71fJohn McCall T = CT->getElementType().getTypePtr(); 3150323ed74658bc8375278eabf074b4777458376540John McCall 3151091f23f1d6d4bcffd6641cda72a6831e08c02ea7John McCall // For enum types, use the known bit width of the enumerators. 3152323ed74658bc8375278eabf074b4777458376540John McCall if (const EnumType *ET = dyn_cast<EnumType>(T)) { 3153323ed74658bc8375278eabf074b4777458376540John McCall EnumDecl *Enum = ET->getDecl(); 31545e1cdac63c3d9c9b32fa41fa0b2d242a58a20d49John McCall if (!Enum->isCompleteDefinition()) 3155091f23f1d6d4bcffd6641cda72a6831e08c02ea7John McCall return IntRange(C.getIntWidth(QualType(T, 0)), false); 3156091f23f1d6d4bcffd6641cda72a6831e08c02ea7John McCall 3157323ed74658bc8375278eabf074b4777458376540John McCall unsigned NumPositive = Enum->getNumPositiveBits(); 3158323ed74658bc8375278eabf074b4777458376540John McCall unsigned NumNegative = Enum->getNumNegativeBits(); 3159323ed74658bc8375278eabf074b4777458376540John McCall 3160323ed74658bc8375278eabf074b4777458376540John McCall return IntRange(std::max(NumPositive, NumNegative), NumNegative == 0); 3161323ed74658bc8375278eabf074b4777458376540John McCall } 316251313c39c84407dd6a323be99a8c322bf8d052a9John McCall 3163f2370c9b4aade940e2253b5b33262ba507d1d71fJohn McCall const BuiltinType *BT = cast<BuiltinType>(T); 3164f2370c9b4aade940e2253b5b33262ba507d1d71fJohn McCall assert(BT->isInteger()); 316551313c39c84407dd6a323be99a8c322bf8d052a9John McCall 3166f2370c9b4aade940e2253b5b33262ba507d1d71fJohn McCall return IntRange(C.getIntWidth(QualType(T, 0)), BT->isUnsignedInteger()); 316751313c39c84407dd6a323be99a8c322bf8d052a9John McCall } 316851313c39c84407dd6a323be99a8c322bf8d052a9John McCall 31691844a6e1074a5c1fd8eadac7fc7317c3e29d4653John McCall /// Returns the "target" range of a canonical integral type, i.e. 31701844a6e1074a5c1fd8eadac7fc7317c3e29d4653John McCall /// the range of values expressible in the type. 31711844a6e1074a5c1fd8eadac7fc7317c3e29d4653John McCall /// 31721844a6e1074a5c1fd8eadac7fc7317c3e29d4653John McCall /// This matches forValueOfCanonicalType except that enums have the 31731844a6e1074a5c1fd8eadac7fc7317c3e29d4653John McCall /// full range of their type, not the range of their enumerators. 31741844a6e1074a5c1fd8eadac7fc7317c3e29d4653John McCall static IntRange forTargetOfCanonicalType(ASTContext &C, const Type *T) { 31751844a6e1074a5c1fd8eadac7fc7317c3e29d4653John McCall assert(T->isCanonicalUnqualified()); 31761844a6e1074a5c1fd8eadac7fc7317c3e29d4653John McCall 31771844a6e1074a5c1fd8eadac7fc7317c3e29d4653John McCall if (const VectorType *VT = dyn_cast<VectorType>(T)) 31781844a6e1074a5c1fd8eadac7fc7317c3e29d4653John McCall T = VT->getElementType().getTypePtr(); 31791844a6e1074a5c1fd8eadac7fc7317c3e29d4653John McCall if (const ComplexType *CT = dyn_cast<ComplexType>(T)) 31801844a6e1074a5c1fd8eadac7fc7317c3e29d4653John McCall T = CT->getElementType().getTypePtr(); 31811844a6e1074a5c1fd8eadac7fc7317c3e29d4653John McCall if (const EnumType *ET = dyn_cast<EnumType>(T)) 318269ff26bd1e7a2faffec0c3b9740cfb0c6bb354c5Douglas Gregor T = C.getCanonicalType(ET->getDecl()->getIntegerType()).getTypePtr(); 31831844a6e1074a5c1fd8eadac7fc7317c3e29d4653John McCall 31841844a6e1074a5c1fd8eadac7fc7317c3e29d4653John McCall const BuiltinType *BT = cast<BuiltinType>(T); 31851844a6e1074a5c1fd8eadac7fc7317c3e29d4653John McCall assert(BT->isInteger()); 31861844a6e1074a5c1fd8eadac7fc7317c3e29d4653John McCall 31871844a6e1074a5c1fd8eadac7fc7317c3e29d4653John McCall return IntRange(C.getIntWidth(QualType(T, 0)), BT->isUnsignedInteger()); 31881844a6e1074a5c1fd8eadac7fc7317c3e29d4653John McCall } 31891844a6e1074a5c1fd8eadac7fc7317c3e29d4653John McCall 31901844a6e1074a5c1fd8eadac7fc7317c3e29d4653John McCall /// Returns the supremum of two ranges: i.e. their conservative merge. 3191c0cd21d2a3301a7a88e0052aebdd09c2441f826dJohn McCall static IntRange join(IntRange L, IntRange R) { 3192f2370c9b4aade940e2253b5b33262ba507d1d71fJohn McCall return IntRange(std::max(L.Width, R.Width), 319360fad45739b764886f707bd204eae9ecce6db1f2John McCall L.NonNegative && R.NonNegative); 319460fad45739b764886f707bd204eae9ecce6db1f2John McCall } 319560fad45739b764886f707bd204eae9ecce6db1f2John McCall 31961844a6e1074a5c1fd8eadac7fc7317c3e29d4653John McCall /// Returns the infinum of two ranges: i.e. their aggressive merge. 3197c0cd21d2a3301a7a88e0052aebdd09c2441f826dJohn McCall static IntRange meet(IntRange L, IntRange R) { 319860fad45739b764886f707bd204eae9ecce6db1f2John McCall return IntRange(std::min(L.Width, R.Width), 319960fad45739b764886f707bd204eae9ecce6db1f2John McCall L.NonNegative || R.NonNegative); 320051313c39c84407dd6a323be99a8c322bf8d052a9John McCall } 3201f2370c9b4aade940e2253b5b33262ba507d1d71fJohn McCall}; 320251313c39c84407dd6a323be99a8c322bf8d052a9John McCall 3203f2370c9b4aade940e2253b5b33262ba507d1d71fJohn McCallIntRange GetValueRange(ASTContext &C, llvm::APSInt &value, unsigned MaxWidth) { 3204f2370c9b4aade940e2253b5b33262ba507d1d71fJohn McCall if (value.isSigned() && value.isNegative()) 3205f2370c9b4aade940e2253b5b33262ba507d1d71fJohn McCall return IntRange(value.getMinSignedBits(), false); 320651313c39c84407dd6a323be99a8c322bf8d052a9John McCall 3207f2370c9b4aade940e2253b5b33262ba507d1d71fJohn McCall if (value.getBitWidth() > MaxWidth) 32089f71a8f4c7a182a5236da9e747d57cc1d1bd24c2Jay Foad value = value.trunc(MaxWidth); 320951313c39c84407dd6a323be99a8c322bf8d052a9John McCall 3210f2370c9b4aade940e2253b5b33262ba507d1d71fJohn McCall // isNonNegative() just checks the sign bit without considering 3211f2370c9b4aade940e2253b5b33262ba507d1d71fJohn McCall // signedness. 3212f2370c9b4aade940e2253b5b33262ba507d1d71fJohn McCall return IntRange(value.getActiveBits(), true); 321351313c39c84407dd6a323be99a8c322bf8d052a9John McCall} 321451313c39c84407dd6a323be99a8c322bf8d052a9John McCall 32150acc311bf73c85fd34ce6f89a4e786b7ecd214aaJohn McCallIntRange GetValueRange(ASTContext &C, APValue &result, QualType Ty, 3216f2370c9b4aade940e2253b5b33262ba507d1d71fJohn McCall unsigned MaxWidth) { 3217f2370c9b4aade940e2253b5b33262ba507d1d71fJohn McCall if (result.isInt()) 3218f2370c9b4aade940e2253b5b33262ba507d1d71fJohn McCall return GetValueRange(C, result.getInt(), MaxWidth); 321951313c39c84407dd6a323be99a8c322bf8d052a9John McCall 3220f2370c9b4aade940e2253b5b33262ba507d1d71fJohn McCall if (result.isVector()) { 32210acc311bf73c85fd34ce6f89a4e786b7ecd214aaJohn McCall IntRange R = GetValueRange(C, result.getVectorElt(0), Ty, MaxWidth); 32220acc311bf73c85fd34ce6f89a4e786b7ecd214aaJohn McCall for (unsigned i = 1, e = result.getVectorLength(); i != e; ++i) { 32230acc311bf73c85fd34ce6f89a4e786b7ecd214aaJohn McCall IntRange El = GetValueRange(C, result.getVectorElt(i), Ty, MaxWidth); 32240acc311bf73c85fd34ce6f89a4e786b7ecd214aaJohn McCall R = IntRange::join(R, El); 32250acc311bf73c85fd34ce6f89a4e786b7ecd214aaJohn McCall } 3226f2370c9b4aade940e2253b5b33262ba507d1d71fJohn McCall return R; 322751313c39c84407dd6a323be99a8c322bf8d052a9John McCall } 322851313c39c84407dd6a323be99a8c322bf8d052a9John McCall 3229f2370c9b4aade940e2253b5b33262ba507d1d71fJohn McCall if (result.isComplexInt()) { 3230f2370c9b4aade940e2253b5b33262ba507d1d71fJohn McCall IntRange R = GetValueRange(C, result.getComplexIntReal(), MaxWidth); 3231f2370c9b4aade940e2253b5b33262ba507d1d71fJohn McCall IntRange I = GetValueRange(C, result.getComplexIntImag(), MaxWidth); 3232f2370c9b4aade940e2253b5b33262ba507d1d71fJohn McCall return IntRange::join(R, I); 3233f2370c9b4aade940e2253b5b33262ba507d1d71fJohn McCall } 3234f2370c9b4aade940e2253b5b33262ba507d1d71fJohn McCall 3235f2370c9b4aade940e2253b5b33262ba507d1d71fJohn McCall // This can happen with lossless casts to intptr_t of "based" lvalues. 3236f2370c9b4aade940e2253b5b33262ba507d1d71fJohn McCall // Assume it might use arbitrary bits. 32370acc311bf73c85fd34ce6f89a4e786b7ecd214aaJohn McCall // FIXME: The only reason we need to pass the type in here is to get 32380acc311bf73c85fd34ce6f89a4e786b7ecd214aaJohn McCall // the sign right on this one case. It would be nice if APValue 32390acc311bf73c85fd34ce6f89a4e786b7ecd214aaJohn McCall // preserved this. 3240f2370c9b4aade940e2253b5b33262ba507d1d71fJohn McCall assert(result.isLValue()); 32415e9ebb3c0fb554d9285aa99c470abdf283272bd9Douglas Gregor return IntRange(MaxWidth, Ty->isUnsignedIntegerOrEnumerationType()); 324251313c39c84407dd6a323be99a8c322bf8d052a9John McCall} 324351313c39c84407dd6a323be99a8c322bf8d052a9John McCall 3244f2370c9b4aade940e2253b5b33262ba507d1d71fJohn McCall/// Pseudo-evaluate the given integer expression, estimating the 3245f2370c9b4aade940e2253b5b33262ba507d1d71fJohn McCall/// range of values it might take. 3246f2370c9b4aade940e2253b5b33262ba507d1d71fJohn McCall/// 3247f2370c9b4aade940e2253b5b33262ba507d1d71fJohn McCall/// \param MaxWidth - the width to which the value will be truncated 3248f2370c9b4aade940e2253b5b33262ba507d1d71fJohn McCallIntRange GetExprRange(ASTContext &C, Expr *E, unsigned MaxWidth) { 324951313c39c84407dd6a323be99a8c322bf8d052a9John McCall E = E->IgnoreParens(); 325051313c39c84407dd6a323be99a8c322bf8d052a9John McCall 3251f2370c9b4aade940e2253b5b33262ba507d1d71fJohn McCall // Try a full evaluation first. 3252f2370c9b4aade940e2253b5b33262ba507d1d71fJohn McCall Expr::EvalResult result; 325351f4708c00110940ca3f337961915f2ca1668375Richard Smith if (E->EvaluateAsRValue(result, C)) 32540acc311bf73c85fd34ce6f89a4e786b7ecd214aaJohn McCall return GetValueRange(C, result.Val, E->getType(), MaxWidth); 325551313c39c84407dd6a323be99a8c322bf8d052a9John McCall 3256f2370c9b4aade940e2253b5b33262ba507d1d71fJohn McCall // I think we only want to look through implicit casts here; if the 3257f2370c9b4aade940e2253b5b33262ba507d1d71fJohn McCall // user has an explicit widening cast, we should treat the value as 3258f2370c9b4aade940e2253b5b33262ba507d1d71fJohn McCall // being of the new, wider type. 3259f2370c9b4aade940e2253b5b33262ba507d1d71fJohn McCall if (ImplicitCastExpr *CE = dyn_cast<ImplicitCastExpr>(E)) { 32602de56d1d0c3a504ad1529de2677628bdfbb95cd4John McCall if (CE->getCastKind() == CK_NoOp) 3261f2370c9b4aade940e2253b5b33262ba507d1d71fJohn McCall return GetExprRange(C, CE->getSubExpr(), MaxWidth); 326251313c39c84407dd6a323be99a8c322bf8d052a9John McCall 32631844a6e1074a5c1fd8eadac7fc7317c3e29d4653John McCall IntRange OutputTypeRange = IntRange::forValueOfType(C, CE->getType()); 326451313c39c84407dd6a323be99a8c322bf8d052a9John McCall 32652de56d1d0c3a504ad1529de2677628bdfbb95cd4John McCall bool isIntegerCast = (CE->getCastKind() == CK_IntegralCast); 326660fad45739b764886f707bd204eae9ecce6db1f2John McCall 3267f2370c9b4aade940e2253b5b33262ba507d1d71fJohn McCall // Assume that non-integer casts can span the full range of the type. 326860fad45739b764886f707bd204eae9ecce6db1f2John McCall if (!isIntegerCast) 3269f2370c9b4aade940e2253b5b33262ba507d1d71fJohn McCall return OutputTypeRange; 327051313c39c84407dd6a323be99a8c322bf8d052a9John McCall 3271f2370c9b4aade940e2253b5b33262ba507d1d71fJohn McCall IntRange SubRange 3272f2370c9b4aade940e2253b5b33262ba507d1d71fJohn McCall = GetExprRange(C, CE->getSubExpr(), 3273f2370c9b4aade940e2253b5b33262ba507d1d71fJohn McCall std::min(MaxWidth, OutputTypeRange.Width)); 327451313c39c84407dd6a323be99a8c322bf8d052a9John McCall 3275f2370c9b4aade940e2253b5b33262ba507d1d71fJohn McCall // Bail out if the subexpr's range is as wide as the cast type. 3276f2370c9b4aade940e2253b5b33262ba507d1d71fJohn McCall if (SubRange.Width >= OutputTypeRange.Width) 3277f2370c9b4aade940e2253b5b33262ba507d1d71fJohn McCall return OutputTypeRange; 327851313c39c84407dd6a323be99a8c322bf8d052a9John McCall 3279f2370c9b4aade940e2253b5b33262ba507d1d71fJohn McCall // Otherwise, we take the smaller width, and we're non-negative if 3280f2370c9b4aade940e2253b5b33262ba507d1d71fJohn McCall // either the output type or the subexpr is. 3281f2370c9b4aade940e2253b5b33262ba507d1d71fJohn McCall return IntRange(SubRange.Width, 3282f2370c9b4aade940e2253b5b33262ba507d1d71fJohn McCall SubRange.NonNegative || OutputTypeRange.NonNegative); 3283f2370c9b4aade940e2253b5b33262ba507d1d71fJohn McCall } 3284f2370c9b4aade940e2253b5b33262ba507d1d71fJohn McCall 3285f2370c9b4aade940e2253b5b33262ba507d1d71fJohn McCall if (ConditionalOperator *CO = dyn_cast<ConditionalOperator>(E)) { 3286f2370c9b4aade940e2253b5b33262ba507d1d71fJohn McCall // If we can fold the condition, just take that operand. 3287f2370c9b4aade940e2253b5b33262ba507d1d71fJohn McCall bool CondResult; 3288f2370c9b4aade940e2253b5b33262ba507d1d71fJohn McCall if (CO->getCond()->EvaluateAsBooleanCondition(CondResult, C)) 3289f2370c9b4aade940e2253b5b33262ba507d1d71fJohn McCall return GetExprRange(C, CondResult ? CO->getTrueExpr() 3290f2370c9b4aade940e2253b5b33262ba507d1d71fJohn McCall : CO->getFalseExpr(), 3291f2370c9b4aade940e2253b5b33262ba507d1d71fJohn McCall MaxWidth); 3292f2370c9b4aade940e2253b5b33262ba507d1d71fJohn McCall 3293f2370c9b4aade940e2253b5b33262ba507d1d71fJohn McCall // Otherwise, conservatively merge. 3294f2370c9b4aade940e2253b5b33262ba507d1d71fJohn McCall IntRange L = GetExprRange(C, CO->getTrueExpr(), MaxWidth); 3295f2370c9b4aade940e2253b5b33262ba507d1d71fJohn McCall IntRange R = GetExprRange(C, CO->getFalseExpr(), MaxWidth); 3296f2370c9b4aade940e2253b5b33262ba507d1d71fJohn McCall return IntRange::join(L, R); 329751313c39c84407dd6a323be99a8c322bf8d052a9John McCall } 329851313c39c84407dd6a323be99a8c322bf8d052a9John McCall 329951313c39c84407dd6a323be99a8c322bf8d052a9John McCall if (BinaryOperator *BO = dyn_cast<BinaryOperator>(E)) { 330051313c39c84407dd6a323be99a8c322bf8d052a9John McCall switch (BO->getOpcode()) { 330151313c39c84407dd6a323be99a8c322bf8d052a9John McCall 3302f2370c9b4aade940e2253b5b33262ba507d1d71fJohn McCall // Boolean-valued operations are single-bit and positive. 33032de56d1d0c3a504ad1529de2677628bdfbb95cd4John McCall case BO_LAnd: 33042de56d1d0c3a504ad1529de2677628bdfbb95cd4John McCall case BO_LOr: 33052de56d1d0c3a504ad1529de2677628bdfbb95cd4John McCall case BO_LT: 33062de56d1d0c3a504ad1529de2677628bdfbb95cd4John McCall case BO_GT: 33072de56d1d0c3a504ad1529de2677628bdfbb95cd4John McCall case BO_LE: 33082de56d1d0c3a504ad1529de2677628bdfbb95cd4John McCall case BO_GE: 33092de56d1d0c3a504ad1529de2677628bdfbb95cd4John McCall case BO_EQ: 33102de56d1d0c3a504ad1529de2677628bdfbb95cd4John McCall case BO_NE: 3311f2370c9b4aade940e2253b5b33262ba507d1d71fJohn McCall return IntRange::forBoolType(); 331251313c39c84407dd6a323be99a8c322bf8d052a9John McCall 3313862ff87c0d306af8dfdbe7ac59f181a5815546e5John McCall // The type of the assignments is the type of the LHS, so the RHS 3314862ff87c0d306af8dfdbe7ac59f181a5815546e5John McCall // is not necessarily the same type. 33152de56d1d0c3a504ad1529de2677628bdfbb95cd4John McCall case BO_MulAssign: 33162de56d1d0c3a504ad1529de2677628bdfbb95cd4John McCall case BO_DivAssign: 33172de56d1d0c3a504ad1529de2677628bdfbb95cd4John McCall case BO_RemAssign: 33182de56d1d0c3a504ad1529de2677628bdfbb95cd4John McCall case BO_AddAssign: 33192de56d1d0c3a504ad1529de2677628bdfbb95cd4John McCall case BO_SubAssign: 3320862ff87c0d306af8dfdbe7ac59f181a5815546e5John McCall case BO_XorAssign: 3321862ff87c0d306af8dfdbe7ac59f181a5815546e5John McCall case BO_OrAssign: 3322862ff87c0d306af8dfdbe7ac59f181a5815546e5John McCall // TODO: bitfields? 33231844a6e1074a5c1fd8eadac7fc7317c3e29d4653John McCall return IntRange::forValueOfType(C, E->getType()); 3324c0cd21d2a3301a7a88e0052aebdd09c2441f826dJohn McCall 3325862ff87c0d306af8dfdbe7ac59f181a5815546e5John McCall // Simple assignments just pass through the RHS, which will have 3326862ff87c0d306af8dfdbe7ac59f181a5815546e5John McCall // been coerced to the LHS type. 3327862ff87c0d306af8dfdbe7ac59f181a5815546e5John McCall case BO_Assign: 3328862ff87c0d306af8dfdbe7ac59f181a5815546e5John McCall // TODO: bitfields? 3329862ff87c0d306af8dfdbe7ac59f181a5815546e5John McCall return GetExprRange(C, BO->getRHS(), MaxWidth); 3330862ff87c0d306af8dfdbe7ac59f181a5815546e5John McCall 333151313c39c84407dd6a323be99a8c322bf8d052a9John McCall // Operations with opaque sources are black-listed. 33322de56d1d0c3a504ad1529de2677628bdfbb95cd4John McCall case BO_PtrMemD: 33332de56d1d0c3a504ad1529de2677628bdfbb95cd4John McCall case BO_PtrMemI: 33341844a6e1074a5c1fd8eadac7fc7317c3e29d4653John McCall return IntRange::forValueOfType(C, E->getType()); 333551313c39c84407dd6a323be99a8c322bf8d052a9John McCall 333660fad45739b764886f707bd204eae9ecce6db1f2John McCall // Bitwise-and uses the *infinum* of the two source ranges. 33372de56d1d0c3a504ad1529de2677628bdfbb95cd4John McCall case BO_And: 33382de56d1d0c3a504ad1529de2677628bdfbb95cd4John McCall case BO_AndAssign: 333960fad45739b764886f707bd204eae9ecce6db1f2John McCall return IntRange::meet(GetExprRange(C, BO->getLHS(), MaxWidth), 334060fad45739b764886f707bd204eae9ecce6db1f2John McCall GetExprRange(C, BO->getRHS(), MaxWidth)); 334160fad45739b764886f707bd204eae9ecce6db1f2John McCall 334251313c39c84407dd6a323be99a8c322bf8d052a9John McCall // Left shift gets black-listed based on a judgement call. 33432de56d1d0c3a504ad1529de2677628bdfbb95cd4John McCall case BO_Shl: 33443aae6093dd8f3aecb66d7ff1f4b44e6a86765db4John McCall // ...except that we want to treat '1 << (blah)' as logically 33453aae6093dd8f3aecb66d7ff1f4b44e6a86765db4John McCall // positive. It's an important idiom. 33463aae6093dd8f3aecb66d7ff1f4b44e6a86765db4John McCall if (IntegerLiteral *I 33473aae6093dd8f3aecb66d7ff1f4b44e6a86765db4John McCall = dyn_cast<IntegerLiteral>(BO->getLHS()->IgnoreParenCasts())) { 33483aae6093dd8f3aecb66d7ff1f4b44e6a86765db4John McCall if (I->getValue() == 1) { 33491844a6e1074a5c1fd8eadac7fc7317c3e29d4653John McCall IntRange R = IntRange::forValueOfType(C, E->getType()); 33503aae6093dd8f3aecb66d7ff1f4b44e6a86765db4John McCall return IntRange(R.Width, /*NonNegative*/ true); 33513aae6093dd8f3aecb66d7ff1f4b44e6a86765db4John McCall } 33523aae6093dd8f3aecb66d7ff1f4b44e6a86765db4John McCall } 33533aae6093dd8f3aecb66d7ff1f4b44e6a86765db4John McCall // fallthrough 33543aae6093dd8f3aecb66d7ff1f4b44e6a86765db4John McCall 33552de56d1d0c3a504ad1529de2677628bdfbb95cd4John McCall case BO_ShlAssign: 33561844a6e1074a5c1fd8eadac7fc7317c3e29d4653John McCall return IntRange::forValueOfType(C, E->getType()); 335751313c39c84407dd6a323be99a8c322bf8d052a9John McCall 335860fad45739b764886f707bd204eae9ecce6db1f2John McCall // Right shift by a constant can narrow its left argument. 33592de56d1d0c3a504ad1529de2677628bdfbb95cd4John McCall case BO_Shr: 33602de56d1d0c3a504ad1529de2677628bdfbb95cd4John McCall case BO_ShrAssign: { 336160fad45739b764886f707bd204eae9ecce6db1f2John McCall IntRange L = GetExprRange(C, BO->getLHS(), MaxWidth); 336260fad45739b764886f707bd204eae9ecce6db1f2John McCall 336360fad45739b764886f707bd204eae9ecce6db1f2John McCall // If the shift amount is a positive constant, drop the width by 336460fad45739b764886f707bd204eae9ecce6db1f2John McCall // that much. 336560fad45739b764886f707bd204eae9ecce6db1f2John McCall llvm::APSInt shift; 336660fad45739b764886f707bd204eae9ecce6db1f2John McCall if (BO->getRHS()->isIntegerConstantExpr(shift, C) && 336760fad45739b764886f707bd204eae9ecce6db1f2John McCall shift.isNonNegative()) { 336860fad45739b764886f707bd204eae9ecce6db1f2John McCall unsigned zext = shift.getZExtValue(); 336960fad45739b764886f707bd204eae9ecce6db1f2John McCall if (zext >= L.Width) 337060fad45739b764886f707bd204eae9ecce6db1f2John McCall L.Width = (L.NonNegative ? 0 : 1); 337160fad45739b764886f707bd204eae9ecce6db1f2John McCall else 337260fad45739b764886f707bd204eae9ecce6db1f2John McCall L.Width -= zext; 337360fad45739b764886f707bd204eae9ecce6db1f2John McCall } 337460fad45739b764886f707bd204eae9ecce6db1f2John McCall 337560fad45739b764886f707bd204eae9ecce6db1f2John McCall return L; 337660fad45739b764886f707bd204eae9ecce6db1f2John McCall } 337760fad45739b764886f707bd204eae9ecce6db1f2John McCall 337860fad45739b764886f707bd204eae9ecce6db1f2John McCall // Comma acts as its right operand. 33792de56d1d0c3a504ad1529de2677628bdfbb95cd4John McCall case BO_Comma: 3380f2370c9b4aade940e2253b5b33262ba507d1d71fJohn McCall return GetExprRange(C, BO->getRHS(), MaxWidth); 3381f2370c9b4aade940e2253b5b33262ba507d1d71fJohn McCall 338260fad45739b764886f707bd204eae9ecce6db1f2John McCall // Black-list pointer subtractions. 33832de56d1d0c3a504ad1529de2677628bdfbb95cd4John McCall case BO_Sub: 338451313c39c84407dd6a323be99a8c322bf8d052a9John McCall if (BO->getLHS()->getType()->isPointerType()) 33851844a6e1074a5c1fd8eadac7fc7317c3e29d4653John McCall return IntRange::forValueOfType(C, E->getType()); 338600fe761849278180b0d73f276e468cf4c54ff2adJohn McCall break; 338700fe761849278180b0d73f276e468cf4c54ff2adJohn McCall 338800fe761849278180b0d73f276e468cf4c54ff2adJohn McCall // The width of a division result is mostly determined by the size 338900fe761849278180b0d73f276e468cf4c54ff2adJohn McCall // of the LHS. 339000fe761849278180b0d73f276e468cf4c54ff2adJohn McCall case BO_Div: { 339100fe761849278180b0d73f276e468cf4c54ff2adJohn McCall // Don't 'pre-truncate' the operands. 339200fe761849278180b0d73f276e468cf4c54ff2adJohn McCall unsigned opWidth = C.getIntWidth(E->getType()); 339300fe761849278180b0d73f276e468cf4c54ff2adJohn McCall IntRange L = GetExprRange(C, BO->getLHS(), opWidth); 339400fe761849278180b0d73f276e468cf4c54ff2adJohn McCall 339500fe761849278180b0d73f276e468cf4c54ff2adJohn McCall // If the divisor is constant, use that. 339600fe761849278180b0d73f276e468cf4c54ff2adJohn McCall llvm::APSInt divisor; 339700fe761849278180b0d73f276e468cf4c54ff2adJohn McCall if (BO->getRHS()->isIntegerConstantExpr(divisor, C)) { 339800fe761849278180b0d73f276e468cf4c54ff2adJohn McCall unsigned log2 = divisor.logBase2(); // floor(log_2(divisor)) 339900fe761849278180b0d73f276e468cf4c54ff2adJohn McCall if (log2 >= L.Width) 340000fe761849278180b0d73f276e468cf4c54ff2adJohn McCall L.Width = (L.NonNegative ? 0 : 1); 340100fe761849278180b0d73f276e468cf4c54ff2adJohn McCall else 340200fe761849278180b0d73f276e468cf4c54ff2adJohn McCall L.Width = std::min(L.Width - log2, MaxWidth); 340300fe761849278180b0d73f276e468cf4c54ff2adJohn McCall return L; 340400fe761849278180b0d73f276e468cf4c54ff2adJohn McCall } 340500fe761849278180b0d73f276e468cf4c54ff2adJohn McCall 340600fe761849278180b0d73f276e468cf4c54ff2adJohn McCall // Otherwise, just use the LHS's width. 340700fe761849278180b0d73f276e468cf4c54ff2adJohn McCall IntRange R = GetExprRange(C, BO->getRHS(), opWidth); 340800fe761849278180b0d73f276e468cf4c54ff2adJohn McCall return IntRange(L.Width, L.NonNegative && R.NonNegative); 340900fe761849278180b0d73f276e468cf4c54ff2adJohn McCall } 341000fe761849278180b0d73f276e468cf4c54ff2adJohn McCall 341100fe761849278180b0d73f276e468cf4c54ff2adJohn McCall // The result of a remainder can't be larger than the result of 341200fe761849278180b0d73f276e468cf4c54ff2adJohn McCall // either side. 341300fe761849278180b0d73f276e468cf4c54ff2adJohn McCall case BO_Rem: { 341400fe761849278180b0d73f276e468cf4c54ff2adJohn McCall // Don't 'pre-truncate' the operands. 341500fe761849278180b0d73f276e468cf4c54ff2adJohn McCall unsigned opWidth = C.getIntWidth(E->getType()); 341600fe761849278180b0d73f276e468cf4c54ff2adJohn McCall IntRange L = GetExprRange(C, BO->getLHS(), opWidth); 341700fe761849278180b0d73f276e468cf4c54ff2adJohn McCall IntRange R = GetExprRange(C, BO->getRHS(), opWidth); 341800fe761849278180b0d73f276e468cf4c54ff2adJohn McCall 341900fe761849278180b0d73f276e468cf4c54ff2adJohn McCall IntRange meet = IntRange::meet(L, R); 342000fe761849278180b0d73f276e468cf4c54ff2adJohn McCall meet.Width = std::min(meet.Width, MaxWidth); 342100fe761849278180b0d73f276e468cf4c54ff2adJohn McCall return meet; 342200fe761849278180b0d73f276e468cf4c54ff2adJohn McCall } 34234e4b30ec62d78b24e6556fea2624855c193d0e3eTed Kremenek 342400fe761849278180b0d73f276e468cf4c54ff2adJohn McCall // The default behavior is okay for these. 342500fe761849278180b0d73f276e468cf4c54ff2adJohn McCall case BO_Mul: 342600fe761849278180b0d73f276e468cf4c54ff2adJohn McCall case BO_Add: 342700fe761849278180b0d73f276e468cf4c54ff2adJohn McCall case BO_Xor: 342800fe761849278180b0d73f276e468cf4c54ff2adJohn McCall case BO_Or: 3429f2370c9b4aade940e2253b5b33262ba507d1d71fJohn McCall break; 343051313c39c84407dd6a323be99a8c322bf8d052a9John McCall } 3431f2370c9b4aade940e2253b5b33262ba507d1d71fJohn McCall 343200fe761849278180b0d73f276e468cf4c54ff2adJohn McCall // The default case is to treat the operation as if it were closed 343300fe761849278180b0d73f276e468cf4c54ff2adJohn McCall // on the narrowest type that encompasses both operands. 3434f2370c9b4aade940e2253b5b33262ba507d1d71fJohn McCall IntRange L = GetExprRange(C, BO->getLHS(), MaxWidth); 3435f2370c9b4aade940e2253b5b33262ba507d1d71fJohn McCall IntRange R = GetExprRange(C, BO->getRHS(), MaxWidth); 3436f2370c9b4aade940e2253b5b33262ba507d1d71fJohn McCall return IntRange::join(L, R); 343751313c39c84407dd6a323be99a8c322bf8d052a9John McCall } 343851313c39c84407dd6a323be99a8c322bf8d052a9John McCall 343951313c39c84407dd6a323be99a8c322bf8d052a9John McCall if (UnaryOperator *UO = dyn_cast<UnaryOperator>(E)) { 344051313c39c84407dd6a323be99a8c322bf8d052a9John McCall switch (UO->getOpcode()) { 344151313c39c84407dd6a323be99a8c322bf8d052a9John McCall // Boolean-valued operations are white-listed. 34422de56d1d0c3a504ad1529de2677628bdfbb95cd4John McCall case UO_LNot: 3443f2370c9b4aade940e2253b5b33262ba507d1d71fJohn McCall return IntRange::forBoolType(); 344451313c39c84407dd6a323be99a8c322bf8d052a9John McCall 344551313c39c84407dd6a323be99a8c322bf8d052a9John McCall // Operations with opaque sources are black-listed. 34462de56d1d0c3a504ad1529de2677628bdfbb95cd4John McCall case UO_Deref: 34472de56d1d0c3a504ad1529de2677628bdfbb95cd4John McCall case UO_AddrOf: // should be impossible 34481844a6e1074a5c1fd8eadac7fc7317c3e29d4653John McCall return IntRange::forValueOfType(C, E->getType()); 344951313c39c84407dd6a323be99a8c322bf8d052a9John McCall 345051313c39c84407dd6a323be99a8c322bf8d052a9John McCall default: 3451f2370c9b4aade940e2253b5b33262ba507d1d71fJohn McCall return GetExprRange(C, UO->getSubExpr(), MaxWidth); 345251313c39c84407dd6a323be99a8c322bf8d052a9John McCall } 345351313c39c84407dd6a323be99a8c322bf8d052a9John McCall } 34548ecdb65716cd7914ffb2eeee993fa9039fcd31e8Douglas Gregor 34558ecdb65716cd7914ffb2eeee993fa9039fcd31e8Douglas Gregor if (dyn_cast<OffsetOfExpr>(E)) { 34561844a6e1074a5c1fd8eadac7fc7317c3e29d4653John McCall IntRange::forValueOfType(C, E->getType()); 34578ecdb65716cd7914ffb2eeee993fa9039fcd31e8Douglas Gregor } 345851313c39c84407dd6a323be99a8c322bf8d052a9John McCall 3459a6b8b2c09610b8bc4330e948ece8b940c2386406Richard Smith if (FieldDecl *BitField = E->getBitField()) 3460a6b8b2c09610b8bc4330e948ece8b940c2386406Richard Smith return IntRange(BitField->getBitWidthValue(C), 34615e9ebb3c0fb554d9285aa99c470abdf283272bd9Douglas Gregor BitField->getType()->isUnsignedIntegerOrEnumerationType()); 3462f2370c9b4aade940e2253b5b33262ba507d1d71fJohn McCall 34631844a6e1074a5c1fd8eadac7fc7317c3e29d4653John McCall return IntRange::forValueOfType(C, E->getType()); 3464f2370c9b4aade940e2253b5b33262ba507d1d71fJohn McCall} 3465f2370c9b4aade940e2253b5b33262ba507d1d71fJohn McCall 3466323ed74658bc8375278eabf074b4777458376540John McCallIntRange GetExprRange(ASTContext &C, Expr *E) { 3467323ed74658bc8375278eabf074b4777458376540John McCall return GetExprRange(C, E, C.getIntWidth(E->getType())); 3468323ed74658bc8375278eabf074b4777458376540John McCall} 3469323ed74658bc8375278eabf074b4777458376540John McCall 3470f2370c9b4aade940e2253b5b33262ba507d1d71fJohn McCall/// Checks whether the given value, which currently has the given 3471f2370c9b4aade940e2253b5b33262ba507d1d71fJohn McCall/// source semantics, has the same value when coerced through the 3472f2370c9b4aade940e2253b5b33262ba507d1d71fJohn McCall/// target semantics. 3473f2370c9b4aade940e2253b5b33262ba507d1d71fJohn McCallbool IsSameFloatAfterCast(const llvm::APFloat &value, 3474f2370c9b4aade940e2253b5b33262ba507d1d71fJohn McCall const llvm::fltSemantics &Src, 3475f2370c9b4aade940e2253b5b33262ba507d1d71fJohn McCall const llvm::fltSemantics &Tgt) { 3476f2370c9b4aade940e2253b5b33262ba507d1d71fJohn McCall llvm::APFloat truncated = value; 3477f2370c9b4aade940e2253b5b33262ba507d1d71fJohn McCall 3478f2370c9b4aade940e2253b5b33262ba507d1d71fJohn McCall bool ignored; 3479f2370c9b4aade940e2253b5b33262ba507d1d71fJohn McCall truncated.convert(Src, llvm::APFloat::rmNearestTiesToEven, &ignored); 3480f2370c9b4aade940e2253b5b33262ba507d1d71fJohn McCall truncated.convert(Tgt, llvm::APFloat::rmNearestTiesToEven, &ignored); 3481f2370c9b4aade940e2253b5b33262ba507d1d71fJohn McCall 3482f2370c9b4aade940e2253b5b33262ba507d1d71fJohn McCall return truncated.bitwiseIsEqual(value); 348351313c39c84407dd6a323be99a8c322bf8d052a9John McCall} 348451313c39c84407dd6a323be99a8c322bf8d052a9John McCall 3485f2370c9b4aade940e2253b5b33262ba507d1d71fJohn McCall/// Checks whether the given value, which currently has the given 3486f2370c9b4aade940e2253b5b33262ba507d1d71fJohn McCall/// source semantics, has the same value when coerced through the 3487f2370c9b4aade940e2253b5b33262ba507d1d71fJohn McCall/// target semantics. 3488f2370c9b4aade940e2253b5b33262ba507d1d71fJohn McCall/// 3489f2370c9b4aade940e2253b5b33262ba507d1d71fJohn McCall/// The value might be a vector of floats (or a complex number). 3490f2370c9b4aade940e2253b5b33262ba507d1d71fJohn McCallbool IsSameFloatAfterCast(const APValue &value, 3491f2370c9b4aade940e2253b5b33262ba507d1d71fJohn McCall const llvm::fltSemantics &Src, 3492f2370c9b4aade940e2253b5b33262ba507d1d71fJohn McCall const llvm::fltSemantics &Tgt) { 3493f2370c9b4aade940e2253b5b33262ba507d1d71fJohn McCall if (value.isFloat()) 3494f2370c9b4aade940e2253b5b33262ba507d1d71fJohn McCall return IsSameFloatAfterCast(value.getFloat(), Src, Tgt); 3495f2370c9b4aade940e2253b5b33262ba507d1d71fJohn McCall 3496f2370c9b4aade940e2253b5b33262ba507d1d71fJohn McCall if (value.isVector()) { 3497f2370c9b4aade940e2253b5b33262ba507d1d71fJohn McCall for (unsigned i = 0, e = value.getVectorLength(); i != e; ++i) 3498f2370c9b4aade940e2253b5b33262ba507d1d71fJohn McCall if (!IsSameFloatAfterCast(value.getVectorElt(i), Src, Tgt)) 3499f2370c9b4aade940e2253b5b33262ba507d1d71fJohn McCall return false; 3500f2370c9b4aade940e2253b5b33262ba507d1d71fJohn McCall return true; 3501f2370c9b4aade940e2253b5b33262ba507d1d71fJohn McCall } 3502f2370c9b4aade940e2253b5b33262ba507d1d71fJohn McCall 3503f2370c9b4aade940e2253b5b33262ba507d1d71fJohn McCall assert(value.isComplexFloat()); 3504f2370c9b4aade940e2253b5b33262ba507d1d71fJohn McCall return (IsSameFloatAfterCast(value.getComplexFloatReal(), Src, Tgt) && 3505f2370c9b4aade940e2253b5b33262ba507d1d71fJohn McCall IsSameFloatAfterCast(value.getComplexFloatImag(), Src, Tgt)); 3506f2370c9b4aade940e2253b5b33262ba507d1d71fJohn McCall} 3507f2370c9b4aade940e2253b5b33262ba507d1d71fJohn McCall 3508b4eb64d8426c0eaa58d398961e0e74ff85063d7cJohn McCallvoid AnalyzeImplicitConversions(Sema &S, Expr *E, SourceLocation CC); 3509323ed74658bc8375278eabf074b4777458376540John McCall 3510e3b159c0d4a93db8586861ff011b5a10de4ae6efTed Kremenekstatic bool IsZero(Sema &S, Expr *E) { 3511e3b159c0d4a93db8586861ff011b5a10de4ae6efTed Kremenek // Suppress cases where we are comparing against an enum constant. 3512e3b159c0d4a93db8586861ff011b5a10de4ae6efTed Kremenek if (const DeclRefExpr *DR = 3513e3b159c0d4a93db8586861ff011b5a10de4ae6efTed Kremenek dyn_cast<DeclRefExpr>(E->IgnoreParenImpCasts())) 3514e3b159c0d4a93db8586861ff011b5a10de4ae6efTed Kremenek if (isa<EnumConstantDecl>(DR->getDecl())) 3515e3b159c0d4a93db8586861ff011b5a10de4ae6efTed Kremenek return false; 3516e3b159c0d4a93db8586861ff011b5a10de4ae6efTed Kremenek 3517e3b159c0d4a93db8586861ff011b5a10de4ae6efTed Kremenek // Suppress cases where the '0' value is expanded from a macro. 3518e3b159c0d4a93db8586861ff011b5a10de4ae6efTed Kremenek if (E->getLocStart().isMacroID()) 3519e3b159c0d4a93db8586861ff011b5a10de4ae6efTed Kremenek return false; 3520e3b159c0d4a93db8586861ff011b5a10de4ae6efTed Kremenek 3521323ed74658bc8375278eabf074b4777458376540John McCall llvm::APSInt Value; 3522323ed74658bc8375278eabf074b4777458376540John McCall return E->isIntegerConstantExpr(Value, S.Context) && Value == 0; 3523323ed74658bc8375278eabf074b4777458376540John McCall} 3524323ed74658bc8375278eabf074b4777458376540John McCall 3525372e103dab4239ec52b65b9eda69fd43c0b348d4John McCallstatic bool HasEnumType(Expr *E) { 3526372e103dab4239ec52b65b9eda69fd43c0b348d4John McCall // Strip off implicit integral promotions. 3527372e103dab4239ec52b65b9eda69fd43c0b348d4John McCall while (ImplicitCastExpr *ICE = dyn_cast<ImplicitCastExpr>(E)) { 352863b57aeeebb5bb758ecebf9b41b5131781f32bf3Argyrios Kyrtzidis if (ICE->getCastKind() != CK_IntegralCast && 352963b57aeeebb5bb758ecebf9b41b5131781f32bf3Argyrios Kyrtzidis ICE->getCastKind() != CK_NoOp) 3530372e103dab4239ec52b65b9eda69fd43c0b348d4John McCall break; 353163b57aeeebb5bb758ecebf9b41b5131781f32bf3Argyrios Kyrtzidis E = ICE->getSubExpr(); 3532372e103dab4239ec52b65b9eda69fd43c0b348d4John McCall } 3533372e103dab4239ec52b65b9eda69fd43c0b348d4John McCall 3534372e103dab4239ec52b65b9eda69fd43c0b348d4John McCall return E->getType()->isEnumeralType(); 3535372e103dab4239ec52b65b9eda69fd43c0b348d4John McCall} 3536372e103dab4239ec52b65b9eda69fd43c0b348d4John McCall 3537323ed74658bc8375278eabf074b4777458376540John McCallvoid CheckTrivialUnsignedComparison(Sema &S, BinaryOperator *E) { 35382de56d1d0c3a504ad1529de2677628bdfbb95cd4John McCall BinaryOperatorKind op = E->getOpcode(); 353914af91a38c8cf89f0a5e1835d7d8e0fa220e17a9Douglas Gregor if (E->isValueDependent()) 354014af91a38c8cf89f0a5e1835d7d8e0fa220e17a9Douglas Gregor return; 354114af91a38c8cf89f0a5e1835d7d8e0fa220e17a9Douglas Gregor 35422de56d1d0c3a504ad1529de2677628bdfbb95cd4John McCall if (op == BO_LT && IsZero(S, E->getRHS())) { 3543323ed74658bc8375278eabf074b4777458376540John McCall S.Diag(E->getOperatorLoc(), diag::warn_lunsigned_always_true_comparison) 3544372e103dab4239ec52b65b9eda69fd43c0b348d4John McCall << "< 0" << "false" << HasEnumType(E->getLHS()) 3545323ed74658bc8375278eabf074b4777458376540John McCall << E->getLHS()->getSourceRange() << E->getRHS()->getSourceRange(); 35462de56d1d0c3a504ad1529de2677628bdfbb95cd4John McCall } else if (op == BO_GE && IsZero(S, E->getRHS())) { 3547323ed74658bc8375278eabf074b4777458376540John McCall S.Diag(E->getOperatorLoc(), diag::warn_lunsigned_always_true_comparison) 3548372e103dab4239ec52b65b9eda69fd43c0b348d4John McCall << ">= 0" << "true" << HasEnumType(E->getLHS()) 3549323ed74658bc8375278eabf074b4777458376540John McCall << E->getLHS()->getSourceRange() << E->getRHS()->getSourceRange(); 35502de56d1d0c3a504ad1529de2677628bdfbb95cd4John McCall } else if (op == BO_GT && IsZero(S, E->getLHS())) { 3551323ed74658bc8375278eabf074b4777458376540John McCall S.Diag(E->getOperatorLoc(), diag::warn_runsigned_always_true_comparison) 3552372e103dab4239ec52b65b9eda69fd43c0b348d4John McCall << "0 >" << "false" << HasEnumType(E->getRHS()) 3553323ed74658bc8375278eabf074b4777458376540John McCall << E->getLHS()->getSourceRange() << E->getRHS()->getSourceRange(); 35542de56d1d0c3a504ad1529de2677628bdfbb95cd4John McCall } else if (op == BO_LE && IsZero(S, E->getLHS())) { 3555323ed74658bc8375278eabf074b4777458376540John McCall S.Diag(E->getOperatorLoc(), diag::warn_runsigned_always_true_comparison) 3556372e103dab4239ec52b65b9eda69fd43c0b348d4John McCall << "0 <=" << "true" << HasEnumType(E->getRHS()) 3557323ed74658bc8375278eabf074b4777458376540John McCall << E->getLHS()->getSourceRange() << E->getRHS()->getSourceRange(); 3558323ed74658bc8375278eabf074b4777458376540John McCall } 3559323ed74658bc8375278eabf074b4777458376540John McCall} 3560323ed74658bc8375278eabf074b4777458376540John McCall 3561323ed74658bc8375278eabf074b4777458376540John McCall/// Analyze the operands of the given comparison. Implements the 3562323ed74658bc8375278eabf074b4777458376540John McCall/// fallback case from AnalyzeComparison. 3563323ed74658bc8375278eabf074b4777458376540John McCallvoid AnalyzeImpConvsInComparison(Sema &S, BinaryOperator *E) { 3564b4eb64d8426c0eaa58d398961e0e74ff85063d7cJohn McCall AnalyzeImplicitConversions(S, E->getLHS(), E->getOperatorLoc()); 3565b4eb64d8426c0eaa58d398961e0e74ff85063d7cJohn McCall AnalyzeImplicitConversions(S, E->getRHS(), E->getOperatorLoc()); 3566323ed74658bc8375278eabf074b4777458376540John McCall} 3567f2370c9b4aade940e2253b5b33262ba507d1d71fJohn McCall 3568ba26e58c64b4f6233dfc4bcd3ef6ce83aab47ffcJohn McCall/// \brief Implements -Wsign-compare. 3569ba26e58c64b4f6233dfc4bcd3ef6ce83aab47ffcJohn McCall/// 3570dd22509c82eb7681a0f46b41d61cb2e25a4d8fa1Richard Trieu/// \param E the binary operator to check for warnings 3571323ed74658bc8375278eabf074b4777458376540John McCallvoid AnalyzeComparison(Sema &S, BinaryOperator *E) { 3572323ed74658bc8375278eabf074b4777458376540John McCall // The type the comparison is being performed in. 3573323ed74658bc8375278eabf074b4777458376540John McCall QualType T = E->getLHS()->getType(); 3574323ed74658bc8375278eabf074b4777458376540John McCall assert(S.Context.hasSameUnqualifiedType(T, E->getRHS()->getType()) 3575323ed74658bc8375278eabf074b4777458376540John McCall && "comparison with mismatched types"); 3576323ed74658bc8375278eabf074b4777458376540John McCall 3577323ed74658bc8375278eabf074b4777458376540John McCall // We don't do anything special if this isn't an unsigned integral 3578323ed74658bc8375278eabf074b4777458376540John McCall // comparison: we're only interested in integral comparisons, and 3579323ed74658bc8375278eabf074b4777458376540John McCall // signed comparisons only happen in cases we don't care to warn about. 35803e026e323f1bd820fb9c880b1db951c87df94bb4Douglas Gregor // 35813e026e323f1bd820fb9c880b1db951c87df94bb4Douglas Gregor // We also don't care about value-dependent expressions or expressions 35823e026e323f1bd820fb9c880b1db951c87df94bb4Douglas Gregor // whose result is a constant. 35833e026e323f1bd820fb9c880b1db951c87df94bb4Douglas Gregor if (!T->hasUnsignedIntegerRepresentation() 35843e026e323f1bd820fb9c880b1db951c87df94bb4Douglas Gregor || E->isValueDependent() || E->isIntegerConstantExpr(S.Context)) 3585323ed74658bc8375278eabf074b4777458376540John McCall return AnalyzeImpConvsInComparison(S, E); 3586323ed74658bc8375278eabf074b4777458376540John McCall 3587dd22509c82eb7681a0f46b41d61cb2e25a4d8fa1Richard Trieu Expr *LHS = E->getLHS()->IgnoreParenImpCasts(); 3588dd22509c82eb7681a0f46b41d61cb2e25a4d8fa1Richard Trieu Expr *RHS = E->getRHS()->IgnoreParenImpCasts(); 3589323ed74658bc8375278eabf074b4777458376540John McCall 3590323ed74658bc8375278eabf074b4777458376540John McCall // Check to see if one of the (unmodified) operands is of different 3591323ed74658bc8375278eabf074b4777458376540John McCall // signedness. 3592323ed74658bc8375278eabf074b4777458376540John McCall Expr *signedOperand, *unsignedOperand; 3593dd22509c82eb7681a0f46b41d61cb2e25a4d8fa1Richard Trieu if (LHS->getType()->hasSignedIntegerRepresentation()) { 3594dd22509c82eb7681a0f46b41d61cb2e25a4d8fa1Richard Trieu assert(!RHS->getType()->hasSignedIntegerRepresentation() && 3595323ed74658bc8375278eabf074b4777458376540John McCall "unsigned comparison between two signed integer expressions?"); 3596dd22509c82eb7681a0f46b41d61cb2e25a4d8fa1Richard Trieu signedOperand = LHS; 3597dd22509c82eb7681a0f46b41d61cb2e25a4d8fa1Richard Trieu unsignedOperand = RHS; 3598dd22509c82eb7681a0f46b41d61cb2e25a4d8fa1Richard Trieu } else if (RHS->getType()->hasSignedIntegerRepresentation()) { 3599dd22509c82eb7681a0f46b41d61cb2e25a4d8fa1Richard Trieu signedOperand = RHS; 3600dd22509c82eb7681a0f46b41d61cb2e25a4d8fa1Richard Trieu unsignedOperand = LHS; 3601ba26e58c64b4f6233dfc4bcd3ef6ce83aab47ffcJohn McCall } else { 3602323ed74658bc8375278eabf074b4777458376540John McCall CheckTrivialUnsignedComparison(S, E); 3603323ed74658bc8375278eabf074b4777458376540John McCall return AnalyzeImpConvsInComparison(S, E); 3604ba26e58c64b4f6233dfc4bcd3ef6ce83aab47ffcJohn McCall } 3605ba26e58c64b4f6233dfc4bcd3ef6ce83aab47ffcJohn McCall 3606323ed74658bc8375278eabf074b4777458376540John McCall // Otherwise, calculate the effective range of the signed operand. 3607323ed74658bc8375278eabf074b4777458376540John McCall IntRange signedRange = GetExprRange(S.Context, signedOperand); 3608f2370c9b4aade940e2253b5b33262ba507d1d71fJohn McCall 3609323ed74658bc8375278eabf074b4777458376540John McCall // Go ahead and analyze implicit conversions in the operands. Note 3610323ed74658bc8375278eabf074b4777458376540John McCall // that we skip the implicit conversions on both sides. 3611dd22509c82eb7681a0f46b41d61cb2e25a4d8fa1Richard Trieu AnalyzeImplicitConversions(S, LHS, E->getOperatorLoc()); 3612dd22509c82eb7681a0f46b41d61cb2e25a4d8fa1Richard Trieu AnalyzeImplicitConversions(S, RHS, E->getOperatorLoc()); 3613ba26e58c64b4f6233dfc4bcd3ef6ce83aab47ffcJohn McCall 3614323ed74658bc8375278eabf074b4777458376540John McCall // If the signed range is non-negative, -Wsign-compare won't fire, 3615323ed74658bc8375278eabf074b4777458376540John McCall // but we should still check for comparisons which are always true 3616323ed74658bc8375278eabf074b4777458376540John McCall // or false. 3617323ed74658bc8375278eabf074b4777458376540John McCall if (signedRange.NonNegative) 3618323ed74658bc8375278eabf074b4777458376540John McCall return CheckTrivialUnsignedComparison(S, E); 3619ba26e58c64b4f6233dfc4bcd3ef6ce83aab47ffcJohn McCall 3620ba26e58c64b4f6233dfc4bcd3ef6ce83aab47ffcJohn McCall // For (in)equality comparisons, if the unsigned operand is a 3621ba26e58c64b4f6233dfc4bcd3ef6ce83aab47ffcJohn McCall // constant which cannot collide with a overflowed signed operand, 3622ba26e58c64b4f6233dfc4bcd3ef6ce83aab47ffcJohn McCall // then reinterpreting the signed operand as unsigned will not 3623ba26e58c64b4f6233dfc4bcd3ef6ce83aab47ffcJohn McCall // change the result of the comparison. 3624323ed74658bc8375278eabf074b4777458376540John McCall if (E->isEqualityOp()) { 3625323ed74658bc8375278eabf074b4777458376540John McCall unsigned comparisonWidth = S.Context.getIntWidth(T); 3626323ed74658bc8375278eabf074b4777458376540John McCall IntRange unsignedRange = GetExprRange(S.Context, unsignedOperand); 3627323ed74658bc8375278eabf074b4777458376540John McCall 3628323ed74658bc8375278eabf074b4777458376540John McCall // We should never be unable to prove that the unsigned operand is 3629323ed74658bc8375278eabf074b4777458376540John McCall // non-negative. 3630323ed74658bc8375278eabf074b4777458376540John McCall assert(unsignedRange.NonNegative && "unsigned range includes negative?"); 3631ba26e58c64b4f6233dfc4bcd3ef6ce83aab47ffcJohn McCall 3632323ed74658bc8375278eabf074b4777458376540John McCall if (unsignedRange.Width < comparisonWidth) 3633323ed74658bc8375278eabf074b4777458376540John McCall return; 3634323ed74658bc8375278eabf074b4777458376540John McCall } 3635323ed74658bc8375278eabf074b4777458376540John McCall 3636323ed74658bc8375278eabf074b4777458376540John McCall S.Diag(E->getOperatorLoc(), diag::warn_mixed_sign_comparison) 3637dd22509c82eb7681a0f46b41d61cb2e25a4d8fa1Richard Trieu << LHS->getType() << RHS->getType() 3638dd22509c82eb7681a0f46b41d61cb2e25a4d8fa1Richard Trieu << LHS->getSourceRange() << RHS->getSourceRange(); 3639ba26e58c64b4f6233dfc4bcd3ef6ce83aab47ffcJohn McCall} 3640ba26e58c64b4f6233dfc4bcd3ef6ce83aab47ffcJohn McCall 364115d7d12226f83de24f96f4bf4e27ebba30fef51eJohn McCall/// Analyzes an attempt to assign the given value to a bitfield. 364215d7d12226f83de24f96f4bf4e27ebba30fef51eJohn McCall/// 364315d7d12226f83de24f96f4bf4e27ebba30fef51eJohn McCall/// Returns true if there was something fishy about the attempt. 364415d7d12226f83de24f96f4bf4e27ebba30fef51eJohn McCallbool AnalyzeBitFieldAssignment(Sema &S, FieldDecl *Bitfield, Expr *Init, 364515d7d12226f83de24f96f4bf4e27ebba30fef51eJohn McCall SourceLocation InitLoc) { 364615d7d12226f83de24f96f4bf4e27ebba30fef51eJohn McCall assert(Bitfield->isBitField()); 364715d7d12226f83de24f96f4bf4e27ebba30fef51eJohn McCall if (Bitfield->isInvalidDecl()) 364815d7d12226f83de24f96f4bf4e27ebba30fef51eJohn McCall return false; 364915d7d12226f83de24f96f4bf4e27ebba30fef51eJohn McCall 365091b6014876e9186f968f74a8975ab8fc08ef1b68John McCall // White-list bool bitfields. 365191b6014876e9186f968f74a8975ab8fc08ef1b68John McCall if (Bitfield->getType()->isBooleanType()) 365291b6014876e9186f968f74a8975ab8fc08ef1b68John McCall return false; 365391b6014876e9186f968f74a8975ab8fc08ef1b68John McCall 365446ff3034d14aaa92b530e96480741f3d5d458cb8Douglas Gregor // Ignore value- or type-dependent expressions. 365546ff3034d14aaa92b530e96480741f3d5d458cb8Douglas Gregor if (Bitfield->getBitWidth()->isValueDependent() || 365646ff3034d14aaa92b530e96480741f3d5d458cb8Douglas Gregor Bitfield->getBitWidth()->isTypeDependent() || 365746ff3034d14aaa92b530e96480741f3d5d458cb8Douglas Gregor Init->isValueDependent() || 365846ff3034d14aaa92b530e96480741f3d5d458cb8Douglas Gregor Init->isTypeDependent()) 365946ff3034d14aaa92b530e96480741f3d5d458cb8Douglas Gregor return false; 366046ff3034d14aaa92b530e96480741f3d5d458cb8Douglas Gregor 366115d7d12226f83de24f96f4bf4e27ebba30fef51eJohn McCall Expr *OriginalInit = Init->IgnoreParenImpCasts(); 366215d7d12226f83de24f96f4bf4e27ebba30fef51eJohn McCall 366315d7d12226f83de24f96f4bf4e27ebba30fef51eJohn McCall Expr::EvalResult InitValue; 366451f4708c00110940ca3f337961915f2ca1668375Richard Smith if (!OriginalInit->EvaluateAsRValue(InitValue, S.Context) || 366515d7d12226f83de24f96f4bf4e27ebba30fef51eJohn McCall !InitValue.Val.isInt()) 366615d7d12226f83de24f96f4bf4e27ebba30fef51eJohn McCall return false; 366715d7d12226f83de24f96f4bf4e27ebba30fef51eJohn McCall 366815d7d12226f83de24f96f4bf4e27ebba30fef51eJohn McCall const llvm::APSInt &Value = InitValue.Val.getInt(); 366915d7d12226f83de24f96f4bf4e27ebba30fef51eJohn McCall unsigned OriginalWidth = Value.getBitWidth(); 3670a6b8b2c09610b8bc4330e948ece8b940c2386406Richard Smith unsigned FieldWidth = Bitfield->getBitWidthValue(S.Context); 367115d7d12226f83de24f96f4bf4e27ebba30fef51eJohn McCall 367215d7d12226f83de24f96f4bf4e27ebba30fef51eJohn McCall if (OriginalWidth <= FieldWidth) 367315d7d12226f83de24f96f4bf4e27ebba30fef51eJohn McCall return false; 367415d7d12226f83de24f96f4bf4e27ebba30fef51eJohn McCall 36759f71a8f4c7a182a5236da9e747d57cc1d1bd24c2Jay Foad llvm::APSInt TruncatedValue = Value.trunc(FieldWidth); 367615d7d12226f83de24f96f4bf4e27ebba30fef51eJohn McCall 367715d7d12226f83de24f96f4bf4e27ebba30fef51eJohn McCall // It's fairly common to write values into signed bitfields 367815d7d12226f83de24f96f4bf4e27ebba30fef51eJohn McCall // that, if sign-extended, would end up becoming a different 367915d7d12226f83de24f96f4bf4e27ebba30fef51eJohn McCall // value. We don't want to warn about that. 368015d7d12226f83de24f96f4bf4e27ebba30fef51eJohn McCall if (Value.isSigned() && Value.isNegative()) 36819f71a8f4c7a182a5236da9e747d57cc1d1bd24c2Jay Foad TruncatedValue = TruncatedValue.sext(OriginalWidth); 368215d7d12226f83de24f96f4bf4e27ebba30fef51eJohn McCall else 36839f71a8f4c7a182a5236da9e747d57cc1d1bd24c2Jay Foad TruncatedValue = TruncatedValue.zext(OriginalWidth); 368415d7d12226f83de24f96f4bf4e27ebba30fef51eJohn McCall 368515d7d12226f83de24f96f4bf4e27ebba30fef51eJohn McCall if (Value == TruncatedValue) 368615d7d12226f83de24f96f4bf4e27ebba30fef51eJohn McCall return false; 368715d7d12226f83de24f96f4bf4e27ebba30fef51eJohn McCall 368815d7d12226f83de24f96f4bf4e27ebba30fef51eJohn McCall std::string PrettyValue = Value.toString(10); 368915d7d12226f83de24f96f4bf4e27ebba30fef51eJohn McCall std::string PrettyTrunc = TruncatedValue.toString(10); 369015d7d12226f83de24f96f4bf4e27ebba30fef51eJohn McCall 369115d7d12226f83de24f96f4bf4e27ebba30fef51eJohn McCall S.Diag(InitLoc, diag::warn_impcast_bitfield_precision_constant) 369215d7d12226f83de24f96f4bf4e27ebba30fef51eJohn McCall << PrettyValue << PrettyTrunc << OriginalInit->getType() 369315d7d12226f83de24f96f4bf4e27ebba30fef51eJohn McCall << Init->getSourceRange(); 369415d7d12226f83de24f96f4bf4e27ebba30fef51eJohn McCall 369515d7d12226f83de24f96f4bf4e27ebba30fef51eJohn McCall return true; 369615d7d12226f83de24f96f4bf4e27ebba30fef51eJohn McCall} 369715d7d12226f83de24f96f4bf4e27ebba30fef51eJohn McCall 3698beb22aaa22e255241d6a81e8b0a9239f5fa584f3John McCall/// Analyze the given simple or compound assignment for warning-worthy 3699beb22aaa22e255241d6a81e8b0a9239f5fa584f3John McCall/// operations. 3700beb22aaa22e255241d6a81e8b0a9239f5fa584f3John McCallvoid AnalyzeAssignment(Sema &S, BinaryOperator *E) { 3701beb22aaa22e255241d6a81e8b0a9239f5fa584f3John McCall // Just recurse on the LHS. 3702beb22aaa22e255241d6a81e8b0a9239f5fa584f3John McCall AnalyzeImplicitConversions(S, E->getLHS(), E->getOperatorLoc()); 3703beb22aaa22e255241d6a81e8b0a9239f5fa584f3John McCall 3704beb22aaa22e255241d6a81e8b0a9239f5fa584f3John McCall // We want to recurse on the RHS as normal unless we're assigning to 3705beb22aaa22e255241d6a81e8b0a9239f5fa584f3John McCall // a bitfield. 3706beb22aaa22e255241d6a81e8b0a9239f5fa584f3John McCall if (FieldDecl *Bitfield = E->getLHS()->getBitField()) { 370715d7d12226f83de24f96f4bf4e27ebba30fef51eJohn McCall if (AnalyzeBitFieldAssignment(S, Bitfield, E->getRHS(), 370815d7d12226f83de24f96f4bf4e27ebba30fef51eJohn McCall E->getOperatorLoc())) { 370915d7d12226f83de24f96f4bf4e27ebba30fef51eJohn McCall // Recurse, ignoring any implicit conversions on the RHS. 371015d7d12226f83de24f96f4bf4e27ebba30fef51eJohn McCall return AnalyzeImplicitConversions(S, E->getRHS()->IgnoreParenImpCasts(), 371115d7d12226f83de24f96f4bf4e27ebba30fef51eJohn McCall E->getOperatorLoc()); 3712beb22aaa22e255241d6a81e8b0a9239f5fa584f3John McCall } 3713beb22aaa22e255241d6a81e8b0a9239f5fa584f3John McCall } 3714beb22aaa22e255241d6a81e8b0a9239f5fa584f3John McCall 3715beb22aaa22e255241d6a81e8b0a9239f5fa584f3John McCall AnalyzeImplicitConversions(S, E->getRHS(), E->getOperatorLoc()); 3716beb22aaa22e255241d6a81e8b0a9239f5fa584f3John McCall} 3717beb22aaa22e255241d6a81e8b0a9239f5fa584f3John McCall 371851313c39c84407dd6a323be99a8c322bf8d052a9John McCall/// Diagnose an implicit cast; purely a helper for CheckImplicitConversion. 37195a5b38f4afaf4f203b96a11ba79890c7cd4cc4b8Douglas Gregorvoid DiagnoseImpCast(Sema &S, Expr *E, QualType SourceType, QualType T, 37205a5b38f4afaf4f203b96a11ba79890c7cd4cc4b8Douglas Gregor SourceLocation CContext, unsigned diag) { 37215a5b38f4afaf4f203b96a11ba79890c7cd4cc4b8Douglas Gregor S.Diag(E->getExprLoc(), diag) 37225a5b38f4afaf4f203b96a11ba79890c7cd4cc4b8Douglas Gregor << SourceType << T << E->getSourceRange() << SourceRange(CContext); 37235a5b38f4afaf4f203b96a11ba79890c7cd4cc4b8Douglas Gregor} 37245a5b38f4afaf4f203b96a11ba79890c7cd4cc4b8Douglas Gregor 3725e1b02e00d851389415a5b7a1398de26c382887c6Chandler Carruth/// Diagnose an implicit cast; purely a helper for CheckImplicitConversion. 3726e1b02e00d851389415a5b7a1398de26c382887c6Chandler Carruthvoid DiagnoseImpCast(Sema &S, Expr *E, QualType T, SourceLocation CContext, 3727e1b02e00d851389415a5b7a1398de26c382887c6Chandler Carruth unsigned diag) { 3728e1b02e00d851389415a5b7a1398de26c382887c6Chandler Carruth DiagnoseImpCast(S, E, E->getType(), T, CContext, diag); 3729e1b02e00d851389415a5b7a1398de26c382887c6Chandler Carruth} 3730e1b02e00d851389415a5b7a1398de26c382887c6Chandler Carruth 37319ce6377714a8eb8f577c87028300421e72b00dc9Matt Beaumont-Gay/// Diagnose an implicit cast from a literal expression. Does not warn when the 37329ce6377714a8eb8f577c87028300421e72b00dc9Matt Beaumont-Gay/// cast wouldn't lose information. 3733f65076ebf5e8bc5ae7b77fe3c3a65dc5db8d763fChandler Carruthvoid DiagnoseFloatingLiteralImpCast(Sema &S, FloatingLiteral *FL, QualType T, 3734f65076ebf5e8bc5ae7b77fe3c3a65dc5db8d763fChandler Carruth SourceLocation CContext) { 37359ce6377714a8eb8f577c87028300421e72b00dc9Matt Beaumont-Gay // Try to convert the literal exactly to an integer. If we can, don't warn. 3736f65076ebf5e8bc5ae7b77fe3c3a65dc5db8d763fChandler Carruth bool isExact = false; 37379ce6377714a8eb8f577c87028300421e72b00dc9Matt Beaumont-Gay const llvm::APFloat &Value = FL->getValue(); 37383e1ef7849845a9e7bf79156bbb8a2c26d77a1d2eJeffrey Yasskin llvm::APSInt IntegerValue(S.Context.getIntWidth(T), 37393e1ef7849845a9e7bf79156bbb8a2c26d77a1d2eJeffrey Yasskin T->hasUnsignedIntegerRepresentation()); 37403e1ef7849845a9e7bf79156bbb8a2c26d77a1d2eJeffrey Yasskin if (Value.convertToInteger(IntegerValue, 3741f65076ebf5e8bc5ae7b77fe3c3a65dc5db8d763fChandler Carruth llvm::APFloat::rmTowardZero, &isExact) 37429ce6377714a8eb8f577c87028300421e72b00dc9Matt Beaumont-Gay == llvm::APFloat::opOK && isExact) 3743f65076ebf5e8bc5ae7b77fe3c3a65dc5db8d763fChandler Carruth return; 3744f65076ebf5e8bc5ae7b77fe3c3a65dc5db8d763fChandler Carruth 37459ce6377714a8eb8f577c87028300421e72b00dc9Matt Beaumont-Gay S.Diag(FL->getExprLoc(), diag::warn_impcast_literal_float_to_integer) 37469ce6377714a8eb8f577c87028300421e72b00dc9Matt Beaumont-Gay << FL->getType() << T << FL->getSourceRange() << SourceRange(CContext); 3747f65076ebf5e8bc5ae7b77fe3c3a65dc5db8d763fChandler Carruth} 3748f65076ebf5e8bc5ae7b77fe3c3a65dc5db8d763fChandler Carruth 3749091f23f1d6d4bcffd6641cda72a6831e08c02ea7John McCallstd::string PrettyPrintInRange(const llvm::APSInt &Value, IntRange Range) { 3750091f23f1d6d4bcffd6641cda72a6831e08c02ea7John McCall if (!Range.Width) return "0"; 3751091f23f1d6d4bcffd6641cda72a6831e08c02ea7John McCall 3752091f23f1d6d4bcffd6641cda72a6831e08c02ea7John McCall llvm::APSInt ValueInRange = Value; 3753091f23f1d6d4bcffd6641cda72a6831e08c02ea7John McCall ValueInRange.setIsSigned(!Range.NonNegative); 37549f71a8f4c7a182a5236da9e747d57cc1d1bd24c2Jay Foad ValueInRange = ValueInRange.trunc(Range.Width); 3755091f23f1d6d4bcffd6641cda72a6831e08c02ea7John McCall return ValueInRange.toString(10); 3756091f23f1d6d4bcffd6641cda72a6831e08c02ea7John McCall} 3757091f23f1d6d4bcffd6641cda72a6831e08c02ea7John McCall 3758ef9ff88f54ff26ac9782d98a34b74aa424149be1Ted Kremenekstatic bool isFromSystemMacro(Sema &S, SourceLocation loc) { 3759ef9ff88f54ff26ac9782d98a34b74aa424149be1Ted Kremenek SourceManager &smgr = S.Context.getSourceManager(); 3760ef9ff88f54ff26ac9782d98a34b74aa424149be1Ted Kremenek return loc.isMacroID() && smgr.isInSystemHeader(smgr.getSpellingLoc(loc)); 3761ef9ff88f54ff26ac9782d98a34b74aa424149be1Ted Kremenek} 3762f65076ebf5e8bc5ae7b77fe3c3a65dc5db8d763fChandler Carruth 3763323ed74658bc8375278eabf074b4777458376540John McCallvoid CheckImplicitConversion(Sema &S, Expr *E, QualType T, 3764b4eb64d8426c0eaa58d398961e0e74ff85063d7cJohn McCall SourceLocation CC, bool *ICContext = 0) { 3765323ed74658bc8375278eabf074b4777458376540John McCall if (E->isTypeDependent() || E->isValueDependent()) return; 376651313c39c84407dd6a323be99a8c322bf8d052a9John McCall 3767323ed74658bc8375278eabf074b4777458376540John McCall const Type *Source = S.Context.getCanonicalType(E->getType()).getTypePtr(); 3768323ed74658bc8375278eabf074b4777458376540John McCall const Type *Target = S.Context.getCanonicalType(T).getTypePtr(); 3769323ed74658bc8375278eabf074b4777458376540John McCall if (Source == Target) return; 3770323ed74658bc8375278eabf074b4777458376540John McCall if (Target->isDependentType()) return; 377151313c39c84407dd6a323be99a8c322bf8d052a9John McCall 3772108f756bebd991eaa980cfb9994353612a2e5ff6Chandler Carruth // If the conversion context location is invalid don't complain. We also 3773108f756bebd991eaa980cfb9994353612a2e5ff6Chandler Carruth // don't want to emit a warning if the issue occurs from the expansion of 3774108f756bebd991eaa980cfb9994353612a2e5ff6Chandler Carruth // a system macro. The problem is that 'getSpellingLoc()' is slow, so we 3775108f756bebd991eaa980cfb9994353612a2e5ff6Chandler Carruth // delay this check as long as possible. Once we detect we are in that 3776108f756bebd991eaa980cfb9994353612a2e5ff6Chandler Carruth // scenario, we just return. 3777ef9ff88f54ff26ac9782d98a34b74aa424149be1Ted Kremenek if (CC.isInvalid()) 3778b4eb64d8426c0eaa58d398961e0e74ff85063d7cJohn McCall return; 3779b4eb64d8426c0eaa58d398961e0e74ff85063d7cJohn McCall 3780f1f8b1a404d9ce6f0eb78e97b598a220d8ca9090Richard Trieu // Diagnose implicit casts to bool. 3781f1f8b1a404d9ce6f0eb78e97b598a220d8ca9090Richard Trieu if (Target->isSpecificBuiltinType(BuiltinType::Bool)) { 3782f1f8b1a404d9ce6f0eb78e97b598a220d8ca9090Richard Trieu if (isa<StringLiteral>(E)) 3783f1f8b1a404d9ce6f0eb78e97b598a220d8ca9090Richard Trieu // Warn on string literal to bool. Checks for string literals in logical 3784f1f8b1a404d9ce6f0eb78e97b598a220d8ca9090Richard Trieu // expressions, for instances, assert(0 && "error here"), is prevented 3785f1f8b1a404d9ce6f0eb78e97b598a220d8ca9090Richard Trieu // by a check in AnalyzeImplicitConversions(). 3786f1f8b1a404d9ce6f0eb78e97b598a220d8ca9090Richard Trieu return DiagnoseImpCast(S, E, T, CC, 3787f1f8b1a404d9ce6f0eb78e97b598a220d8ca9090Richard Trieu diag::warn_impcast_string_literal_to_bool); 3788e14ca9f509dc22d8fcc5d21d70d28a5848983b42Lang Hames if (Source->isFunctionType()) { 3789e14ca9f509dc22d8fcc5d21d70d28a5848983b42Lang Hames // Warn on function to bool. Checks free functions and static member 3790e14ca9f509dc22d8fcc5d21d70d28a5848983b42Lang Hames // functions. Weakly imported functions are excluded from the check, 3791e14ca9f509dc22d8fcc5d21d70d28a5848983b42Lang Hames // since it's common to test their value to check whether the linker 3792e14ca9f509dc22d8fcc5d21d70d28a5848983b42Lang Hames // found a definition for them. 3793e14ca9f509dc22d8fcc5d21d70d28a5848983b42Lang Hames ValueDecl *D = 0; 3794e14ca9f509dc22d8fcc5d21d70d28a5848983b42Lang Hames if (DeclRefExpr* R = dyn_cast<DeclRefExpr>(E)) { 3795e14ca9f509dc22d8fcc5d21d70d28a5848983b42Lang Hames D = R->getDecl(); 3796e14ca9f509dc22d8fcc5d21d70d28a5848983b42Lang Hames } else if (MemberExpr *M = dyn_cast<MemberExpr>(E)) { 3797e14ca9f509dc22d8fcc5d21d70d28a5848983b42Lang Hames D = M->getMemberDecl(); 3798e14ca9f509dc22d8fcc5d21d70d28a5848983b42Lang Hames } 3799e14ca9f509dc22d8fcc5d21d70d28a5848983b42Lang Hames 3800e14ca9f509dc22d8fcc5d21d70d28a5848983b42Lang Hames if (D && !D->isWeak()) { 380126b45d86085a125af036dbcf85dad3087b664ab2Richard Trieu if (FunctionDecl* F = dyn_cast<FunctionDecl>(D)) { 380226b45d86085a125af036dbcf85dad3087b664ab2Richard Trieu S.Diag(E->getExprLoc(), diag::warn_impcast_function_to_bool) 380326b45d86085a125af036dbcf85dad3087b664ab2Richard Trieu << F << E->getSourceRange() << SourceRange(CC); 38042def77399ab3088106a2d61372344f5b7104e1a2David Blaikie S.Diag(E->getExprLoc(), diag::note_function_to_bool_silence) 38052def77399ab3088106a2d61372344f5b7104e1a2David Blaikie << FixItHint::CreateInsertion(E->getExprLoc(), "&"); 38062def77399ab3088106a2d61372344f5b7104e1a2David Blaikie QualType ReturnType; 38072def77399ab3088106a2d61372344f5b7104e1a2David Blaikie UnresolvedSet<4> NonTemplateOverloads; 38082def77399ab3088106a2d61372344f5b7104e1a2David Blaikie S.isExprCallable(*E, ReturnType, NonTemplateOverloads); 38092def77399ab3088106a2d61372344f5b7104e1a2David Blaikie if (!ReturnType.isNull() 38102def77399ab3088106a2d61372344f5b7104e1a2David Blaikie && ReturnType->isSpecificBuiltinType(BuiltinType::Bool)) 38112def77399ab3088106a2d61372344f5b7104e1a2David Blaikie S.Diag(E->getExprLoc(), diag::note_function_to_bool_call) 38122def77399ab3088106a2d61372344f5b7104e1a2David Blaikie << FixItHint::CreateInsertion( 38132def77399ab3088106a2d61372344f5b7104e1a2David Blaikie S.getPreprocessor().getLocForEndOfToken(E->getLocEnd()), "()"); 381426b45d86085a125af036dbcf85dad3087b664ab2Richard Trieu return; 381526b45d86085a125af036dbcf85dad3087b664ab2Richard Trieu } 3816e14ca9f509dc22d8fcc5d21d70d28a5848983b42Lang Hames } 3817e14ca9f509dc22d8fcc5d21d70d28a5848983b42Lang Hames } 3818e37cdc42bf7298a974dfdfa9c03ef11398e7c889David Blaikie return; // Other casts to bool are not checked. 3819f1f8b1a404d9ce6f0eb78e97b598a220d8ca9090Richard Trieu } 382051313c39c84407dd6a323be99a8c322bf8d052a9John McCall 382151313c39c84407dd6a323be99a8c322bf8d052a9John McCall // Strip vector types. 382251313c39c84407dd6a323be99a8c322bf8d052a9John McCall if (isa<VectorType>(Source)) { 3823ef9ff88f54ff26ac9782d98a34b74aa424149be1Ted Kremenek if (!isa<VectorType>(Target)) { 3824ef9ff88f54ff26ac9782d98a34b74aa424149be1Ted Kremenek if (isFromSystemMacro(S, CC)) 3825ef9ff88f54ff26ac9782d98a34b74aa424149be1Ted Kremenek return; 3826b4eb64d8426c0eaa58d398961e0e74ff85063d7cJohn McCall return DiagnoseImpCast(S, E, T, CC, diag::warn_impcast_vector_scalar); 3827ef9ff88f54ff26ac9782d98a34b74aa424149be1Ted Kremenek } 3828b792b30ce3d31e3eb3cfee3321238cf3cc2165b0Chris Lattner 3829b792b30ce3d31e3eb3cfee3321238cf3cc2165b0Chris Lattner // If the vector cast is cast between two vectors of the same size, it is 3830b792b30ce3d31e3eb3cfee3321238cf3cc2165b0Chris Lattner // a bitcast, not a conversion. 3831b792b30ce3d31e3eb3cfee3321238cf3cc2165b0Chris Lattner if (S.Context.getTypeSize(Source) == S.Context.getTypeSize(Target)) 3832b792b30ce3d31e3eb3cfee3321238cf3cc2165b0Chris Lattner return; 383351313c39c84407dd6a323be99a8c322bf8d052a9John McCall 383451313c39c84407dd6a323be99a8c322bf8d052a9John McCall Source = cast<VectorType>(Source)->getElementType().getTypePtr(); 383551313c39c84407dd6a323be99a8c322bf8d052a9John McCall Target = cast<VectorType>(Target)->getElementType().getTypePtr(); 383651313c39c84407dd6a323be99a8c322bf8d052a9John McCall } 383751313c39c84407dd6a323be99a8c322bf8d052a9John McCall 383851313c39c84407dd6a323be99a8c322bf8d052a9John McCall // Strip complex types. 383951313c39c84407dd6a323be99a8c322bf8d052a9John McCall if (isa<ComplexType>(Source)) { 3840ef9ff88f54ff26ac9782d98a34b74aa424149be1Ted Kremenek if (!isa<ComplexType>(Target)) { 3841ef9ff88f54ff26ac9782d98a34b74aa424149be1Ted Kremenek if (isFromSystemMacro(S, CC)) 3842ef9ff88f54ff26ac9782d98a34b74aa424149be1Ted Kremenek return; 3843ef9ff88f54ff26ac9782d98a34b74aa424149be1Ted Kremenek 3844b4eb64d8426c0eaa58d398961e0e74ff85063d7cJohn McCall return DiagnoseImpCast(S, E, T, CC, diag::warn_impcast_complex_scalar); 3845ef9ff88f54ff26ac9782d98a34b74aa424149be1Ted Kremenek } 384651313c39c84407dd6a323be99a8c322bf8d052a9John McCall 384751313c39c84407dd6a323be99a8c322bf8d052a9John McCall Source = cast<ComplexType>(Source)->getElementType().getTypePtr(); 384851313c39c84407dd6a323be99a8c322bf8d052a9John McCall Target = cast<ComplexType>(Target)->getElementType().getTypePtr(); 384951313c39c84407dd6a323be99a8c322bf8d052a9John McCall } 385051313c39c84407dd6a323be99a8c322bf8d052a9John McCall 385151313c39c84407dd6a323be99a8c322bf8d052a9John McCall const BuiltinType *SourceBT = dyn_cast<BuiltinType>(Source); 385251313c39c84407dd6a323be99a8c322bf8d052a9John McCall const BuiltinType *TargetBT = dyn_cast<BuiltinType>(Target); 385351313c39c84407dd6a323be99a8c322bf8d052a9John McCall 385451313c39c84407dd6a323be99a8c322bf8d052a9John McCall // If the source is floating point... 385551313c39c84407dd6a323be99a8c322bf8d052a9John McCall if (SourceBT && SourceBT->isFloatingPoint()) { 385651313c39c84407dd6a323be99a8c322bf8d052a9John McCall // ...and the target is floating point... 385751313c39c84407dd6a323be99a8c322bf8d052a9John McCall if (TargetBT && TargetBT->isFloatingPoint()) { 385851313c39c84407dd6a323be99a8c322bf8d052a9John McCall // ...then warn if we're dropping FP rank. 385951313c39c84407dd6a323be99a8c322bf8d052a9John McCall 386051313c39c84407dd6a323be99a8c322bf8d052a9John McCall // Builtin FP kinds are ordered by increasing FP rank. 386151313c39c84407dd6a323be99a8c322bf8d052a9John McCall if (SourceBT->getKind() > TargetBT->getKind()) { 386251313c39c84407dd6a323be99a8c322bf8d052a9John McCall // Don't warn about float constants that are precisely 386351313c39c84407dd6a323be99a8c322bf8d052a9John McCall // representable in the target type. 386451313c39c84407dd6a323be99a8c322bf8d052a9John McCall Expr::EvalResult result; 386551f4708c00110940ca3f337961915f2ca1668375Richard Smith if (E->EvaluateAsRValue(result, S.Context)) { 386651313c39c84407dd6a323be99a8c322bf8d052a9John McCall // Value might be a float, a float vector, or a float complex. 386751313c39c84407dd6a323be99a8c322bf8d052a9John McCall if (IsSameFloatAfterCast(result.Val, 3868323ed74658bc8375278eabf074b4777458376540John McCall S.Context.getFloatTypeSemantics(QualType(TargetBT, 0)), 3869323ed74658bc8375278eabf074b4777458376540John McCall S.Context.getFloatTypeSemantics(QualType(SourceBT, 0)))) 387051313c39c84407dd6a323be99a8c322bf8d052a9John McCall return; 387151313c39c84407dd6a323be99a8c322bf8d052a9John McCall } 387251313c39c84407dd6a323be99a8c322bf8d052a9John McCall 3873ef9ff88f54ff26ac9782d98a34b74aa424149be1Ted Kremenek if (isFromSystemMacro(S, CC)) 3874ef9ff88f54ff26ac9782d98a34b74aa424149be1Ted Kremenek return; 3875ef9ff88f54ff26ac9782d98a34b74aa424149be1Ted Kremenek 3876b4eb64d8426c0eaa58d398961e0e74ff85063d7cJohn McCall DiagnoseImpCast(S, E, T, CC, diag::warn_impcast_float_precision); 387751313c39c84407dd6a323be99a8c322bf8d052a9John McCall } 387851313c39c84407dd6a323be99a8c322bf8d052a9John McCall return; 387951313c39c84407dd6a323be99a8c322bf8d052a9John McCall } 388051313c39c84407dd6a323be99a8c322bf8d052a9John McCall 3881ef9ff88f54ff26ac9782d98a34b74aa424149be1Ted Kremenek // If the target is integral, always warn. 3882a5b9332418f25338f118358e27303cd510d54107Chandler Carruth if ((TargetBT && TargetBT->isInteger())) { 3883ef9ff88f54ff26ac9782d98a34b74aa424149be1Ted Kremenek if (isFromSystemMacro(S, CC)) 3884ef9ff88f54ff26ac9782d98a34b74aa424149be1Ted Kremenek return; 3885ef9ff88f54ff26ac9782d98a34b74aa424149be1Ted Kremenek 3886a5b9332418f25338f118358e27303cd510d54107Chandler Carruth Expr *InnerE = E->IgnoreParenImpCasts(); 3887634c8af0805ba33b1530470e03aa314141036aa2Matt Beaumont-Gay // We also want to warn on, e.g., "int i = -1.234" 3888634c8af0805ba33b1530470e03aa314141036aa2Matt Beaumont-Gay if (UnaryOperator *UOp = dyn_cast<UnaryOperator>(InnerE)) 3889634c8af0805ba33b1530470e03aa314141036aa2Matt Beaumont-Gay if (UOp->getOpcode() == UO_Minus || UOp->getOpcode() == UO_Plus) 3890634c8af0805ba33b1530470e03aa314141036aa2Matt Beaumont-Gay InnerE = UOp->getSubExpr()->IgnoreParenImpCasts(); 3891634c8af0805ba33b1530470e03aa314141036aa2Matt Beaumont-Gay 3892f65076ebf5e8bc5ae7b77fe3c3a65dc5db8d763fChandler Carruth if (FloatingLiteral *FL = dyn_cast<FloatingLiteral>(InnerE)) { 3893f65076ebf5e8bc5ae7b77fe3c3a65dc5db8d763fChandler Carruth DiagnoseFloatingLiteralImpCast(S, FL, T, CC); 3894a5b9332418f25338f118358e27303cd510d54107Chandler Carruth } else { 3895a5b9332418f25338f118358e27303cd510d54107Chandler Carruth DiagnoseImpCast(S, E, T, CC, diag::warn_impcast_float_integer); 3896a5b9332418f25338f118358e27303cd510d54107Chandler Carruth } 3897a5b9332418f25338f118358e27303cd510d54107Chandler Carruth } 389851313c39c84407dd6a323be99a8c322bf8d052a9John McCall 389951313c39c84407dd6a323be99a8c322bf8d052a9John McCall return; 390051313c39c84407dd6a323be99a8c322bf8d052a9John McCall } 390151313c39c84407dd6a323be99a8c322bf8d052a9John McCall 3902f2370c9b4aade940e2253b5b33262ba507d1d71fJohn McCall if (!Source->isIntegerType() || !Target->isIntegerType()) 390351313c39c84407dd6a323be99a8c322bf8d052a9John McCall return; 390451313c39c84407dd6a323be99a8c322bf8d052a9John McCall 39051838ca5618bc6c84ca3d13d84717bf32d9862bb3Richard Trieu if ((E->isNullPointerConstant(S.Context, Expr::NPC_ValueDependentIsNotNull) 39061838ca5618bc6c84ca3d13d84717bf32d9862bb3Richard Trieu == Expr::NPCK_GNUNull) && Target->isIntegerType()) { 39071838ca5618bc6c84ca3d13d84717bf32d9862bb3Richard Trieu S.Diag(E->getExprLoc(), diag::warn_impcast_null_pointer_to_integer) 39081838ca5618bc6c84ca3d13d84717bf32d9862bb3Richard Trieu << E->getSourceRange() << clang::SourceRange(CC); 39091838ca5618bc6c84ca3d13d84717bf32d9862bb3Richard Trieu return; 39101838ca5618bc6c84ca3d13d84717bf32d9862bb3Richard Trieu } 39111838ca5618bc6c84ca3d13d84717bf32d9862bb3Richard Trieu 3912323ed74658bc8375278eabf074b4777458376540John McCall IntRange SourceRange = GetExprRange(S.Context, E); 39131844a6e1074a5c1fd8eadac7fc7317c3e29d4653John McCall IntRange TargetRange = IntRange::forTargetOfCanonicalType(S.Context, Target); 391451313c39c84407dd6a323be99a8c322bf8d052a9John McCall 3915f2370c9b4aade940e2253b5b33262ba507d1d71fJohn McCall if (SourceRange.Width > TargetRange.Width) { 3916091f23f1d6d4bcffd6641cda72a6831e08c02ea7John McCall // If the source is a constant, use a default-on diagnostic. 3917091f23f1d6d4bcffd6641cda72a6831e08c02ea7John McCall // TODO: this should happen for bitfield stores, too. 3918091f23f1d6d4bcffd6641cda72a6831e08c02ea7John McCall llvm::APSInt Value(32); 3919091f23f1d6d4bcffd6641cda72a6831e08c02ea7John McCall if (E->isIntegerConstantExpr(Value, S.Context)) { 3920ef9ff88f54ff26ac9782d98a34b74aa424149be1Ted Kremenek if (isFromSystemMacro(S, CC)) 3921ef9ff88f54ff26ac9782d98a34b74aa424149be1Ted Kremenek return; 3922ef9ff88f54ff26ac9782d98a34b74aa424149be1Ted Kremenek 3923091f23f1d6d4bcffd6641cda72a6831e08c02ea7John McCall std::string PrettySourceValue = Value.toString(10); 3924091f23f1d6d4bcffd6641cda72a6831e08c02ea7John McCall std::string PrettyTargetValue = PrettyPrintInRange(Value, TargetRange); 3925091f23f1d6d4bcffd6641cda72a6831e08c02ea7John McCall 39265e745da03df27ac620b0a5cc280d0d1757cfbac1Ted Kremenek S.DiagRuntimeBehavior(E->getExprLoc(), E, 39275e745da03df27ac620b0a5cc280d0d1757cfbac1Ted Kremenek S.PDiag(diag::warn_impcast_integer_precision_constant) 39285e745da03df27ac620b0a5cc280d0d1757cfbac1Ted Kremenek << PrettySourceValue << PrettyTargetValue 39295e745da03df27ac620b0a5cc280d0d1757cfbac1Ted Kremenek << E->getType() << T << E->getSourceRange() 39305e745da03df27ac620b0a5cc280d0d1757cfbac1Ted Kremenek << clang::SourceRange(CC)); 3931091f23f1d6d4bcffd6641cda72a6831e08c02ea7John McCall return; 3932091f23f1d6d4bcffd6641cda72a6831e08c02ea7John McCall } 3933091f23f1d6d4bcffd6641cda72a6831e08c02ea7John McCall 3934b792b30ce3d31e3eb3cfee3321238cf3cc2165b0Chris Lattner // People want to build with -Wshorten-64-to-32 and not -Wconversion. 3935ef9ff88f54ff26ac9782d98a34b74aa424149be1Ted Kremenek if (isFromSystemMacro(S, CC)) 3936ef9ff88f54ff26ac9782d98a34b74aa424149be1Ted Kremenek return; 3937ef9ff88f54ff26ac9782d98a34b74aa424149be1Ted Kremenek 3938f2370c9b4aade940e2253b5b33262ba507d1d71fJohn McCall if (SourceRange.Width == 64 && TargetRange.Width == 32) 3939b4eb64d8426c0eaa58d398961e0e74ff85063d7cJohn McCall return DiagnoseImpCast(S, E, T, CC, diag::warn_impcast_integer_64_32); 3940b4eb64d8426c0eaa58d398961e0e74ff85063d7cJohn McCall return DiagnoseImpCast(S, E, T, CC, diag::warn_impcast_integer_precision); 3941323ed74658bc8375278eabf074b4777458376540John McCall } 3942323ed74658bc8375278eabf074b4777458376540John McCall 3943323ed74658bc8375278eabf074b4777458376540John McCall if ((TargetRange.NonNegative && !SourceRange.NonNegative) || 3944323ed74658bc8375278eabf074b4777458376540John McCall (!TargetRange.NonNegative && SourceRange.NonNegative && 3945323ed74658bc8375278eabf074b4777458376540John McCall SourceRange.Width == TargetRange.Width)) { 3946ef9ff88f54ff26ac9782d98a34b74aa424149be1Ted Kremenek 3947ef9ff88f54ff26ac9782d98a34b74aa424149be1Ted Kremenek if (isFromSystemMacro(S, CC)) 3948ef9ff88f54ff26ac9782d98a34b74aa424149be1Ted Kremenek return; 3949ef9ff88f54ff26ac9782d98a34b74aa424149be1Ted Kremenek 3950323ed74658bc8375278eabf074b4777458376540John McCall unsigned DiagID = diag::warn_impcast_integer_sign; 3951323ed74658bc8375278eabf074b4777458376540John McCall 3952323ed74658bc8375278eabf074b4777458376540John McCall // Traditionally, gcc has warned about this under -Wsign-compare. 3953323ed74658bc8375278eabf074b4777458376540John McCall // We also want to warn about it in -Wconversion. 3954323ed74658bc8375278eabf074b4777458376540John McCall // So if -Wconversion is off, use a completely identical diagnostic 3955323ed74658bc8375278eabf074b4777458376540John McCall // in the sign-compare group. 3956323ed74658bc8375278eabf074b4777458376540John McCall // The conditional-checking code will 3957323ed74658bc8375278eabf074b4777458376540John McCall if (ICContext) { 3958323ed74658bc8375278eabf074b4777458376540John McCall DiagID = diag::warn_impcast_integer_sign_conditional; 3959323ed74658bc8375278eabf074b4777458376540John McCall *ICContext = true; 3960323ed74658bc8375278eabf074b4777458376540John McCall } 3961323ed74658bc8375278eabf074b4777458376540John McCall 3962b4eb64d8426c0eaa58d398961e0e74ff85063d7cJohn McCall return DiagnoseImpCast(S, E, T, CC, DiagID); 396351313c39c84407dd6a323be99a8c322bf8d052a9John McCall } 396451313c39c84407dd6a323be99a8c322bf8d052a9John McCall 3965284cc8d8a90ae6558e0a4b60b7dc1ddcfd220758Douglas Gregor // Diagnose conversions between different enumeration types. 39665a5b38f4afaf4f203b96a11ba79890c7cd4cc4b8Douglas Gregor // In C, we pretend that the type of an EnumConstantDecl is its enumeration 39675a5b38f4afaf4f203b96a11ba79890c7cd4cc4b8Douglas Gregor // type, to give us better diagnostics. 39685a5b38f4afaf4f203b96a11ba79890c7cd4cc4b8Douglas Gregor QualType SourceType = E->getType(); 39695a5b38f4afaf4f203b96a11ba79890c7cd4cc4b8Douglas Gregor if (!S.getLangOptions().CPlusPlus) { 39705a5b38f4afaf4f203b96a11ba79890c7cd4cc4b8Douglas Gregor if (DeclRefExpr *DRE = dyn_cast<DeclRefExpr>(E)) 39715a5b38f4afaf4f203b96a11ba79890c7cd4cc4b8Douglas Gregor if (EnumConstantDecl *ECD = dyn_cast<EnumConstantDecl>(DRE->getDecl())) { 39725a5b38f4afaf4f203b96a11ba79890c7cd4cc4b8Douglas Gregor EnumDecl *Enum = cast<EnumDecl>(ECD->getDeclContext()); 39735a5b38f4afaf4f203b96a11ba79890c7cd4cc4b8Douglas Gregor SourceType = S.Context.getTypeDeclType(Enum); 39745a5b38f4afaf4f203b96a11ba79890c7cd4cc4b8Douglas Gregor Source = S.Context.getCanonicalType(SourceType).getTypePtr(); 39755a5b38f4afaf4f203b96a11ba79890c7cd4cc4b8Douglas Gregor } 39765a5b38f4afaf4f203b96a11ba79890c7cd4cc4b8Douglas Gregor } 39775a5b38f4afaf4f203b96a11ba79890c7cd4cc4b8Douglas Gregor 3978284cc8d8a90ae6558e0a4b60b7dc1ddcfd220758Douglas Gregor if (const EnumType *SourceEnum = Source->getAs<EnumType>()) 3979284cc8d8a90ae6558e0a4b60b7dc1ddcfd220758Douglas Gregor if (const EnumType *TargetEnum = Target->getAs<EnumType>()) 3980284cc8d8a90ae6558e0a4b60b7dc1ddcfd220758Douglas Gregor if ((SourceEnum->getDecl()->getIdentifier() || 3981162e1c1b487352434552147967c3dd296ebee2f7Richard Smith SourceEnum->getDecl()->getTypedefNameForAnonDecl()) && 3982284cc8d8a90ae6558e0a4b60b7dc1ddcfd220758Douglas Gregor (TargetEnum->getDecl()->getIdentifier() || 3983162e1c1b487352434552147967c3dd296ebee2f7Richard Smith TargetEnum->getDecl()->getTypedefNameForAnonDecl()) && 3984ef9ff88f54ff26ac9782d98a34b74aa424149be1Ted Kremenek SourceEnum != TargetEnum) { 3985ef9ff88f54ff26ac9782d98a34b74aa424149be1Ted Kremenek if (isFromSystemMacro(S, CC)) 3986ef9ff88f54ff26ac9782d98a34b74aa424149be1Ted Kremenek return; 3987ef9ff88f54ff26ac9782d98a34b74aa424149be1Ted Kremenek 39885a5b38f4afaf4f203b96a11ba79890c7cd4cc4b8Douglas Gregor return DiagnoseImpCast(S, E, SourceType, T, CC, 3989284cc8d8a90ae6558e0a4b60b7dc1ddcfd220758Douglas Gregor diag::warn_impcast_different_enum_types); 3990ef9ff88f54ff26ac9782d98a34b74aa424149be1Ted Kremenek } 3991284cc8d8a90ae6558e0a4b60b7dc1ddcfd220758Douglas Gregor 399251313c39c84407dd6a323be99a8c322bf8d052a9John McCall return; 399351313c39c84407dd6a323be99a8c322bf8d052a9John McCall} 399451313c39c84407dd6a323be99a8c322bf8d052a9John McCall 3995323ed74658bc8375278eabf074b4777458376540John McCallvoid CheckConditionalOperator(Sema &S, ConditionalOperator *E, QualType T); 3996323ed74658bc8375278eabf074b4777458376540John McCall 3997323ed74658bc8375278eabf074b4777458376540John McCallvoid CheckConditionalOperand(Sema &S, Expr *E, QualType T, 3998b4eb64d8426c0eaa58d398961e0e74ff85063d7cJohn McCall SourceLocation CC, bool &ICContext) { 3999323ed74658bc8375278eabf074b4777458376540John McCall E = E->IgnoreParenImpCasts(); 4000323ed74658bc8375278eabf074b4777458376540John McCall 4001323ed74658bc8375278eabf074b4777458376540John McCall if (isa<ConditionalOperator>(E)) 4002323ed74658bc8375278eabf074b4777458376540John McCall return CheckConditionalOperator(S, cast<ConditionalOperator>(E), T); 4003323ed74658bc8375278eabf074b4777458376540John McCall 4004b4eb64d8426c0eaa58d398961e0e74ff85063d7cJohn McCall AnalyzeImplicitConversions(S, E, CC); 4005323ed74658bc8375278eabf074b4777458376540John McCall if (E->getType() != T) 4006b4eb64d8426c0eaa58d398961e0e74ff85063d7cJohn McCall return CheckImplicitConversion(S, E, T, CC, &ICContext); 4007323ed74658bc8375278eabf074b4777458376540John McCall return; 4008323ed74658bc8375278eabf074b4777458376540John McCall} 4009323ed74658bc8375278eabf074b4777458376540John McCall 4010323ed74658bc8375278eabf074b4777458376540John McCallvoid CheckConditionalOperator(Sema &S, ConditionalOperator *E, QualType T) { 4011b4eb64d8426c0eaa58d398961e0e74ff85063d7cJohn McCall SourceLocation CC = E->getQuestionLoc(); 4012b4eb64d8426c0eaa58d398961e0e74ff85063d7cJohn McCall 4013b4eb64d8426c0eaa58d398961e0e74ff85063d7cJohn McCall AnalyzeImplicitConversions(S, E->getCond(), CC); 4014323ed74658bc8375278eabf074b4777458376540John McCall 4015323ed74658bc8375278eabf074b4777458376540John McCall bool Suspicious = false; 4016b4eb64d8426c0eaa58d398961e0e74ff85063d7cJohn McCall CheckConditionalOperand(S, E->getTrueExpr(), T, CC, Suspicious); 4017b4eb64d8426c0eaa58d398961e0e74ff85063d7cJohn McCall CheckConditionalOperand(S, E->getFalseExpr(), T, CC, Suspicious); 4018323ed74658bc8375278eabf074b4777458376540John McCall 4019323ed74658bc8375278eabf074b4777458376540John McCall // If -Wconversion would have warned about either of the candidates 4020323ed74658bc8375278eabf074b4777458376540John McCall // for a signedness conversion to the context type... 4021323ed74658bc8375278eabf074b4777458376540John McCall if (!Suspicious) return; 4022323ed74658bc8375278eabf074b4777458376540John McCall 4023323ed74658bc8375278eabf074b4777458376540John McCall // ...but it's currently ignored... 40240827408865e32789e0ec4b8113a302ccdc531423Argyrios Kyrtzidis if (S.Diags.getDiagnosticLevel(diag::warn_impcast_integer_sign_conditional, 40250827408865e32789e0ec4b8113a302ccdc531423Argyrios Kyrtzidis CC)) 4026323ed74658bc8375278eabf074b4777458376540John McCall return; 4027323ed74658bc8375278eabf074b4777458376540John McCall 4028323ed74658bc8375278eabf074b4777458376540John McCall // ...then check whether it would have warned about either of the 4029323ed74658bc8375278eabf074b4777458376540John McCall // candidates for a signedness conversion to the condition type. 40305254161b269829b74e7a9379b1bdfa27de72d7ccRichard Trieu if (E->getType() == T) return; 40315254161b269829b74e7a9379b1bdfa27de72d7ccRichard Trieu 40325254161b269829b74e7a9379b1bdfa27de72d7ccRichard Trieu Suspicious = false; 40335254161b269829b74e7a9379b1bdfa27de72d7ccRichard Trieu CheckImplicitConversion(S, E->getTrueExpr()->IgnoreParenImpCasts(), 40345254161b269829b74e7a9379b1bdfa27de72d7ccRichard Trieu E->getType(), CC, &Suspicious); 40355254161b269829b74e7a9379b1bdfa27de72d7ccRichard Trieu if (!Suspicious) 40365254161b269829b74e7a9379b1bdfa27de72d7ccRichard Trieu CheckImplicitConversion(S, E->getFalseExpr()->IgnoreParenImpCasts(), 4037b4eb64d8426c0eaa58d398961e0e74ff85063d7cJohn McCall E->getType(), CC, &Suspicious); 4038323ed74658bc8375278eabf074b4777458376540John McCall} 4039323ed74658bc8375278eabf074b4777458376540John McCall 4040323ed74658bc8375278eabf074b4777458376540John McCall/// AnalyzeImplicitConversions - Find and report any interesting 4041323ed74658bc8375278eabf074b4777458376540John McCall/// implicit conversions in the given expression. There are a couple 4042323ed74658bc8375278eabf074b4777458376540John McCall/// of competing diagnostics here, -Wconversion and -Wsign-compare. 4043b4eb64d8426c0eaa58d398961e0e74ff85063d7cJohn McCallvoid AnalyzeImplicitConversions(Sema &S, Expr *OrigE, SourceLocation CC) { 4044323ed74658bc8375278eabf074b4777458376540John McCall QualType T = OrigE->getType(); 4045323ed74658bc8375278eabf074b4777458376540John McCall Expr *E = OrigE->IgnoreParenImpCasts(); 4046323ed74658bc8375278eabf074b4777458376540John McCall 4047f8b6e1591b5c5085cf4dec8df657e32a68053b12Douglas Gregor if (E->isTypeDependent() || E->isValueDependent()) 4048f8b6e1591b5c5085cf4dec8df657e32a68053b12Douglas Gregor return; 4049f8b6e1591b5c5085cf4dec8df657e32a68053b12Douglas Gregor 4050323ed74658bc8375278eabf074b4777458376540John McCall // For conditional operators, we analyze the arguments as if they 4051323ed74658bc8375278eabf074b4777458376540John McCall // were being fed directly into the output. 4052323ed74658bc8375278eabf074b4777458376540John McCall if (isa<ConditionalOperator>(E)) { 4053323ed74658bc8375278eabf074b4777458376540John McCall ConditionalOperator *CO = cast<ConditionalOperator>(E); 4054323ed74658bc8375278eabf074b4777458376540John McCall CheckConditionalOperator(S, CO, T); 4055323ed74658bc8375278eabf074b4777458376540John McCall return; 4056323ed74658bc8375278eabf074b4777458376540John McCall } 4057323ed74658bc8375278eabf074b4777458376540John McCall 4058323ed74658bc8375278eabf074b4777458376540John McCall // Go ahead and check any implicit conversions we might have skipped. 4059323ed74658bc8375278eabf074b4777458376540John McCall // The non-canonical typecheck is just an optimization; 4060323ed74658bc8375278eabf074b4777458376540John McCall // CheckImplicitConversion will filter out dead implicit conversions. 4061323ed74658bc8375278eabf074b4777458376540John McCall if (E->getType() != T) 4062b4eb64d8426c0eaa58d398961e0e74ff85063d7cJohn McCall CheckImplicitConversion(S, E, T, CC); 4063323ed74658bc8375278eabf074b4777458376540John McCall 4064323ed74658bc8375278eabf074b4777458376540John McCall // Now continue drilling into this expression. 4065323ed74658bc8375278eabf074b4777458376540John McCall 4066323ed74658bc8375278eabf074b4777458376540John McCall // Skip past explicit casts. 4067323ed74658bc8375278eabf074b4777458376540John McCall if (isa<ExplicitCastExpr>(E)) { 4068323ed74658bc8375278eabf074b4777458376540John McCall E = cast<ExplicitCastExpr>(E)->getSubExpr()->IgnoreParenImpCasts(); 4069b4eb64d8426c0eaa58d398961e0e74ff85063d7cJohn McCall return AnalyzeImplicitConversions(S, E, CC); 4070323ed74658bc8375278eabf074b4777458376540John McCall } 4071323ed74658bc8375278eabf074b4777458376540John McCall 4072beb22aaa22e255241d6a81e8b0a9239f5fa584f3John McCall if (BinaryOperator *BO = dyn_cast<BinaryOperator>(E)) { 4073beb22aaa22e255241d6a81e8b0a9239f5fa584f3John McCall // Do a somewhat different check with comparison operators. 4074beb22aaa22e255241d6a81e8b0a9239f5fa584f3John McCall if (BO->isComparisonOp()) 4075beb22aaa22e255241d6a81e8b0a9239f5fa584f3John McCall return AnalyzeComparison(S, BO); 4076beb22aaa22e255241d6a81e8b0a9239f5fa584f3John McCall 4077beb22aaa22e255241d6a81e8b0a9239f5fa584f3John McCall // And with assignments and compound assignments. 4078beb22aaa22e255241d6a81e8b0a9239f5fa584f3John McCall if (BO->isAssignmentOp()) 4079beb22aaa22e255241d6a81e8b0a9239f5fa584f3John McCall return AnalyzeAssignment(S, BO); 4080beb22aaa22e255241d6a81e8b0a9239f5fa584f3John McCall } 4081323ed74658bc8375278eabf074b4777458376540John McCall 4082323ed74658bc8375278eabf074b4777458376540John McCall // These break the otherwise-useful invariant below. Fortunately, 4083323ed74658bc8375278eabf074b4777458376540John McCall // we don't really need to recurse into them, because any internal 4084323ed74658bc8375278eabf074b4777458376540John McCall // expressions should have been analyzed already when they were 4085323ed74658bc8375278eabf074b4777458376540John McCall // built into statements. 4086323ed74658bc8375278eabf074b4777458376540John McCall if (isa<StmtExpr>(E)) return; 4087323ed74658bc8375278eabf074b4777458376540John McCall 4088323ed74658bc8375278eabf074b4777458376540John McCall // Don't descend into unevaluated contexts. 4089f4e3cfbe8abd124be6341ef5d714819b4fbd9082Peter Collingbourne if (isa<UnaryExprOrTypeTraitExpr>(E)) return; 4090323ed74658bc8375278eabf074b4777458376540John McCall 4091323ed74658bc8375278eabf074b4777458376540John McCall // Now just recurse over the expression's children. 4092b4eb64d8426c0eaa58d398961e0e74ff85063d7cJohn McCall CC = E->getExprLoc(); 4093f1f8b1a404d9ce6f0eb78e97b598a220d8ca9090Richard Trieu BinaryOperator *BO = dyn_cast<BinaryOperator>(E); 4094f1f8b1a404d9ce6f0eb78e97b598a220d8ca9090Richard Trieu bool IsLogicalOperator = BO && BO->isLogicalOp(); 4095f1f8b1a404d9ce6f0eb78e97b598a220d8ca9090Richard Trieu for (Stmt::child_range I = E->children(); I; ++I) { 4096f1f8b1a404d9ce6f0eb78e97b598a220d8ca9090Richard Trieu Expr *ChildExpr = cast<Expr>(*I); 4097f1f8b1a404d9ce6f0eb78e97b598a220d8ca9090Richard Trieu if (IsLogicalOperator && 4098f1f8b1a404d9ce6f0eb78e97b598a220d8ca9090Richard Trieu isa<StringLiteral>(ChildExpr->IgnoreParenImpCasts())) 4099f1f8b1a404d9ce6f0eb78e97b598a220d8ca9090Richard Trieu // Ignore checking string literals that are in logical operators. 4100f1f8b1a404d9ce6f0eb78e97b598a220d8ca9090Richard Trieu continue; 4101f1f8b1a404d9ce6f0eb78e97b598a220d8ca9090Richard Trieu AnalyzeImplicitConversions(S, ChildExpr, CC); 4102f1f8b1a404d9ce6f0eb78e97b598a220d8ca9090Richard Trieu } 4103323ed74658bc8375278eabf074b4777458376540John McCall} 4104323ed74658bc8375278eabf074b4777458376540John McCall 4105323ed74658bc8375278eabf074b4777458376540John McCall} // end anonymous namespace 4106323ed74658bc8375278eabf074b4777458376540John McCall 4107323ed74658bc8375278eabf074b4777458376540John McCall/// Diagnoses "dangerous" implicit conversions within the given 4108323ed74658bc8375278eabf074b4777458376540John McCall/// expression (which is a full expression). Implements -Wconversion 4109323ed74658bc8375278eabf074b4777458376540John McCall/// and -Wsign-compare. 4110b4eb64d8426c0eaa58d398961e0e74ff85063d7cJohn McCall/// 4111b4eb64d8426c0eaa58d398961e0e74ff85063d7cJohn McCall/// \param CC the "context" location of the implicit conversion, i.e. 4112b4eb64d8426c0eaa58d398961e0e74ff85063d7cJohn McCall/// the most location of the syntactic entity requiring the implicit 4113b4eb64d8426c0eaa58d398961e0e74ff85063d7cJohn McCall/// conversion 4114b4eb64d8426c0eaa58d398961e0e74ff85063d7cJohn McCallvoid Sema::CheckImplicitConversions(Expr *E, SourceLocation CC) { 4115323ed74658bc8375278eabf074b4777458376540John McCall // Don't diagnose in unevaluated contexts. 4116323ed74658bc8375278eabf074b4777458376540John McCall if (ExprEvalContexts.back().Context == Sema::Unevaluated) 4117323ed74658bc8375278eabf074b4777458376540John McCall return; 4118323ed74658bc8375278eabf074b4777458376540John McCall 4119323ed74658bc8375278eabf074b4777458376540John McCall // Don't diagnose for value- or type-dependent expressions. 4120323ed74658bc8375278eabf074b4777458376540John McCall if (E->isTypeDependent() || E->isValueDependent()) 4121323ed74658bc8375278eabf074b4777458376540John McCall return; 4122323ed74658bc8375278eabf074b4777458376540John McCall 4123d6c8865e6f306556b7eef972ceec2cc8ba026a0dKaelyn Uhrain // Check for array bounds violations in cases where the check isn't triggered 4124d6c8865e6f306556b7eef972ceec2cc8ba026a0dKaelyn Uhrain // elsewhere for other Expr types (like BinaryOperators), e.g. when an 4125d6c8865e6f306556b7eef972ceec2cc8ba026a0dKaelyn Uhrain // ArraySubscriptExpr is on the RHS of a variable initialization. 4126d6c8865e6f306556b7eef972ceec2cc8ba026a0dKaelyn Uhrain CheckArrayAccess(E); 4127d6c8865e6f306556b7eef972ceec2cc8ba026a0dKaelyn Uhrain 4128b4eb64d8426c0eaa58d398961e0e74ff85063d7cJohn McCall // This is not the right CC for (e.g.) a variable initialization. 4129b4eb64d8426c0eaa58d398961e0e74ff85063d7cJohn McCall AnalyzeImplicitConversions(*this, E, CC); 4130323ed74658bc8375278eabf074b4777458376540John McCall} 4131323ed74658bc8375278eabf074b4777458376540John McCall 413215d7d12226f83de24f96f4bf4e27ebba30fef51eJohn McCallvoid Sema::CheckBitFieldInitialization(SourceLocation InitLoc, 413315d7d12226f83de24f96f4bf4e27ebba30fef51eJohn McCall FieldDecl *BitField, 413415d7d12226f83de24f96f4bf4e27ebba30fef51eJohn McCall Expr *Init) { 413515d7d12226f83de24f96f4bf4e27ebba30fef51eJohn McCall (void) AnalyzeBitFieldAssignment(*this, BitField, Init, InitLoc); 413615d7d12226f83de24f96f4bf4e27ebba30fef51eJohn McCall} 413715d7d12226f83de24f96f4bf4e27ebba30fef51eJohn McCall 4138f8c4921c73d73123e2b79221ad4f1775ce984cfdMike Stump/// CheckParmsForFunctionDef - Check that the parameters of the given 4139f8c4921c73d73123e2b79221ad4f1775ce984cfdMike Stump/// function are appropriate for the definition of a function. This 4140f8c4921c73d73123e2b79221ad4f1775ce984cfdMike Stump/// takes care of any checks that cannot be performed on the 4141f8c4921c73d73123e2b79221ad4f1775ce984cfdMike Stump/// declaration itself, e.g., that the types of each of the function 4142f8c4921c73d73123e2b79221ad4f1775ce984cfdMike Stump/// parameters are complete. 414382aa713bcda99f388836c2a30bb868d9c9974817Douglas Gregorbool Sema::CheckParmsForFunctionDef(ParmVarDecl **P, ParmVarDecl **PEnd, 414482aa713bcda99f388836c2a30bb868d9c9974817Douglas Gregor bool CheckParameterNames) { 4145f8c4921c73d73123e2b79221ad4f1775ce984cfdMike Stump bool HasInvalidParm = false; 414682aa713bcda99f388836c2a30bb868d9c9974817Douglas Gregor for (; P != PEnd; ++P) { 414782aa713bcda99f388836c2a30bb868d9c9974817Douglas Gregor ParmVarDecl *Param = *P; 414882aa713bcda99f388836c2a30bb868d9c9974817Douglas Gregor 4149f8c4921c73d73123e2b79221ad4f1775ce984cfdMike Stump // C99 6.7.5.3p4: the parameters in a parameter type list in a 4150f8c4921c73d73123e2b79221ad4f1775ce984cfdMike Stump // function declarator that is part of a function definition of 4151f8c4921c73d73123e2b79221ad4f1775ce984cfdMike Stump // that function shall not have incomplete type. 4152f8c4921c73d73123e2b79221ad4f1775ce984cfdMike Stump // 4153f8c4921c73d73123e2b79221ad4f1775ce984cfdMike Stump // This is also C++ [dcl.fct]p6. 4154f8c4921c73d73123e2b79221ad4f1775ce984cfdMike Stump if (!Param->isInvalidDecl() && 4155f8c4921c73d73123e2b79221ad4f1775ce984cfdMike Stump RequireCompleteType(Param->getLocation(), Param->getType(), 4156f8c4921c73d73123e2b79221ad4f1775ce984cfdMike Stump diag::err_typecheck_decl_incomplete_type)) { 4157f8c4921c73d73123e2b79221ad4f1775ce984cfdMike Stump Param->setInvalidDecl(); 4158f8c4921c73d73123e2b79221ad4f1775ce984cfdMike Stump HasInvalidParm = true; 4159f8c4921c73d73123e2b79221ad4f1775ce984cfdMike Stump } 4160f8c4921c73d73123e2b79221ad4f1775ce984cfdMike Stump 4161f8c4921c73d73123e2b79221ad4f1775ce984cfdMike Stump // C99 6.9.1p5: If the declarator includes a parameter type list, the 4162f8c4921c73d73123e2b79221ad4f1775ce984cfdMike Stump // declaration of each parameter shall include an identifier. 416382aa713bcda99f388836c2a30bb868d9c9974817Douglas Gregor if (CheckParameterNames && 416482aa713bcda99f388836c2a30bb868d9c9974817Douglas Gregor Param->getIdentifier() == 0 && 4165f8c4921c73d73123e2b79221ad4f1775ce984cfdMike Stump !Param->isImplicit() && 4166f8c4921c73d73123e2b79221ad4f1775ce984cfdMike Stump !getLangOptions().CPlusPlus) 4167f8c4921c73d73123e2b79221ad4f1775ce984cfdMike Stump Diag(Param->getLocation(), diag::err_parameter_name_omitted); 4168d17e340e2d516139931768697bf080f60920ba9dSam Weinig 4169d17e340e2d516139931768697bf080f60920ba9dSam Weinig // C99 6.7.5.3p12: 4170d17e340e2d516139931768697bf080f60920ba9dSam Weinig // If the function declarator is not part of a definition of that 4171d17e340e2d516139931768697bf080f60920ba9dSam Weinig // function, parameters may have incomplete type and may use the [*] 4172d17e340e2d516139931768697bf080f60920ba9dSam Weinig // notation in their sequences of declarator specifiers to specify 4173d17e340e2d516139931768697bf080f60920ba9dSam Weinig // variable length array types. 4174d17e340e2d516139931768697bf080f60920ba9dSam Weinig QualType PType = Param->getOriginalType(); 4175d17e340e2d516139931768697bf080f60920ba9dSam Weinig if (const ArrayType *AT = Context.getAsArrayType(PType)) { 4176d17e340e2d516139931768697bf080f60920ba9dSam Weinig if (AT->getSizeModifier() == ArrayType::Star) { 4177d17e340e2d516139931768697bf080f60920ba9dSam Weinig // FIXME: This diagnosic should point the the '[*]' if source-location 4178d17e340e2d516139931768697bf080f60920ba9dSam Weinig // information is added for it. 4179d17e340e2d516139931768697bf080f60920ba9dSam Weinig Diag(Param->getLocation(), diag::err_array_star_in_function_definition); 4180d17e340e2d516139931768697bf080f60920ba9dSam Weinig } 4181d17e340e2d516139931768697bf080f60920ba9dSam Weinig } 4182f8c4921c73d73123e2b79221ad4f1775ce984cfdMike Stump } 4183f8c4921c73d73123e2b79221ad4f1775ce984cfdMike Stump 4184f8c4921c73d73123e2b79221ad4f1775ce984cfdMike Stump return HasInvalidParm; 4185f8c4921c73d73123e2b79221ad4f1775ce984cfdMike Stump} 4186b7f4ffe073fa419613946461a2583ba2fcb72280John McCall 4187b7f4ffe073fa419613946461a2583ba2fcb72280John McCall/// CheckCastAlign - Implements -Wcast-align, which warns when a 4188b7f4ffe073fa419613946461a2583ba2fcb72280John McCall/// pointer cast increases the alignment requirements. 4189b7f4ffe073fa419613946461a2583ba2fcb72280John McCallvoid Sema::CheckCastAlign(Expr *Op, QualType T, SourceRange TRange) { 4190b7f4ffe073fa419613946461a2583ba2fcb72280John McCall // This is actually a lot of work to potentially be doing on every 4191b7f4ffe073fa419613946461a2583ba2fcb72280John McCall // cast; don't do it if we're ignoring -Wcast_align (as is the default). 41920827408865e32789e0ec4b8113a302ccdc531423Argyrios Kyrtzidis if (getDiagnostics().getDiagnosticLevel(diag::warn_cast_align, 41930827408865e32789e0ec4b8113a302ccdc531423Argyrios Kyrtzidis TRange.getBegin()) 4194d6471f7c1921c7802804ce3ff6fe9768310f72b9David Blaikie == DiagnosticsEngine::Ignored) 4195b7f4ffe073fa419613946461a2583ba2fcb72280John McCall return; 4196b7f4ffe073fa419613946461a2583ba2fcb72280John McCall 4197b7f4ffe073fa419613946461a2583ba2fcb72280John McCall // Ignore dependent types. 4198b7f4ffe073fa419613946461a2583ba2fcb72280John McCall if (T->isDependentType() || Op->getType()->isDependentType()) 4199b7f4ffe073fa419613946461a2583ba2fcb72280John McCall return; 4200b7f4ffe073fa419613946461a2583ba2fcb72280John McCall 4201b7f4ffe073fa419613946461a2583ba2fcb72280John McCall // Require that the destination be a pointer type. 4202b7f4ffe073fa419613946461a2583ba2fcb72280John McCall const PointerType *DestPtr = T->getAs<PointerType>(); 4203b7f4ffe073fa419613946461a2583ba2fcb72280John McCall if (!DestPtr) return; 4204b7f4ffe073fa419613946461a2583ba2fcb72280John McCall 4205b7f4ffe073fa419613946461a2583ba2fcb72280John McCall // If the destination has alignment 1, we're done. 4206b7f4ffe073fa419613946461a2583ba2fcb72280John McCall QualType DestPointee = DestPtr->getPointeeType(); 4207b7f4ffe073fa419613946461a2583ba2fcb72280John McCall if (DestPointee->isIncompleteType()) return; 4208b7f4ffe073fa419613946461a2583ba2fcb72280John McCall CharUnits DestAlign = Context.getTypeAlignInChars(DestPointee); 4209b7f4ffe073fa419613946461a2583ba2fcb72280John McCall if (DestAlign.isOne()) return; 4210b7f4ffe073fa419613946461a2583ba2fcb72280John McCall 4211b7f4ffe073fa419613946461a2583ba2fcb72280John McCall // Require that the source be a pointer type. 4212b7f4ffe073fa419613946461a2583ba2fcb72280John McCall const PointerType *SrcPtr = Op->getType()->getAs<PointerType>(); 4213b7f4ffe073fa419613946461a2583ba2fcb72280John McCall if (!SrcPtr) return; 4214b7f4ffe073fa419613946461a2583ba2fcb72280John McCall QualType SrcPointee = SrcPtr->getPointeeType(); 4215b7f4ffe073fa419613946461a2583ba2fcb72280John McCall 4216b7f4ffe073fa419613946461a2583ba2fcb72280John McCall // Whitelist casts from cv void*. We already implicitly 4217b7f4ffe073fa419613946461a2583ba2fcb72280John McCall // whitelisted casts to cv void*, since they have alignment 1. 4218b7f4ffe073fa419613946461a2583ba2fcb72280John McCall // Also whitelist casts involving incomplete types, which implicitly 4219b7f4ffe073fa419613946461a2583ba2fcb72280John McCall // includes 'void'. 4220b7f4ffe073fa419613946461a2583ba2fcb72280John McCall if (SrcPointee->isIncompleteType()) return; 4221b7f4ffe073fa419613946461a2583ba2fcb72280John McCall 4222b7f4ffe073fa419613946461a2583ba2fcb72280John McCall CharUnits SrcAlign = Context.getTypeAlignInChars(SrcPointee); 4223b7f4ffe073fa419613946461a2583ba2fcb72280John McCall if (SrcAlign >= DestAlign) return; 4224b7f4ffe073fa419613946461a2583ba2fcb72280John McCall 4225b7f4ffe073fa419613946461a2583ba2fcb72280John McCall Diag(TRange.getBegin(), diag::warn_cast_align) 4226b7f4ffe073fa419613946461a2583ba2fcb72280John McCall << Op->getType() << T 4227b7f4ffe073fa419613946461a2583ba2fcb72280John McCall << static_cast<unsigned>(SrcAlign.getQuantity()) 4228b7f4ffe073fa419613946461a2583ba2fcb72280John McCall << static_cast<unsigned>(DestAlign.getQuantity()) 4229b7f4ffe073fa419613946461a2583ba2fcb72280John McCall << TRange << Op->getSourceRange(); 4230b7f4ffe073fa419613946461a2583ba2fcb72280John McCall} 4231b7f4ffe073fa419613946461a2583ba2fcb72280John McCall 4232d6c8865e6f306556b7eef972ceec2cc8ba026a0dKaelyn Uhrainstatic const Type* getElementType(const Expr *BaseExpr) { 4233d6c8865e6f306556b7eef972ceec2cc8ba026a0dKaelyn Uhrain const Type* EltType = BaseExpr->getType().getTypePtr(); 4234d6c8865e6f306556b7eef972ceec2cc8ba026a0dKaelyn Uhrain if (EltType->isAnyPointerType()) 4235d6c8865e6f306556b7eef972ceec2cc8ba026a0dKaelyn Uhrain return EltType->getPointeeType().getTypePtr(); 4236d6c8865e6f306556b7eef972ceec2cc8ba026a0dKaelyn Uhrain else if (EltType->isArrayType()) 4237d6c8865e6f306556b7eef972ceec2cc8ba026a0dKaelyn Uhrain return EltType->getBaseElementTypeUnsafe(); 4238d6c8865e6f306556b7eef972ceec2cc8ba026a0dKaelyn Uhrain return EltType; 4239d6c8865e6f306556b7eef972ceec2cc8ba026a0dKaelyn Uhrain} 4240d6c8865e6f306556b7eef972ceec2cc8ba026a0dKaelyn Uhrain 4241c268434b332bbe57950d977633369bf5822d9554Chandler Carruth/// \brief Check whether this array fits the idiom of a size-one tail padded 4242c268434b332bbe57950d977633369bf5822d9554Chandler Carruth/// array member of a struct. 4243c268434b332bbe57950d977633369bf5822d9554Chandler Carruth/// 4244c268434b332bbe57950d977633369bf5822d9554Chandler Carruth/// We avoid emitting out-of-bounds access warnings for such arrays as they are 4245c268434b332bbe57950d977633369bf5822d9554Chandler Carruth/// commonly used to emulate flexible arrays in C89 code. 4246c268434b332bbe57950d977633369bf5822d9554Chandler Carruthstatic bool IsTailPaddedMemberArray(Sema &S, llvm::APInt Size, 4247c268434b332bbe57950d977633369bf5822d9554Chandler Carruth const NamedDecl *ND) { 4248c268434b332bbe57950d977633369bf5822d9554Chandler Carruth if (Size != 1 || !ND) return false; 4249c268434b332bbe57950d977633369bf5822d9554Chandler Carruth 4250c268434b332bbe57950d977633369bf5822d9554Chandler Carruth const FieldDecl *FD = dyn_cast<FieldDecl>(ND); 4251c268434b332bbe57950d977633369bf5822d9554Chandler Carruth if (!FD) return false; 4252c268434b332bbe57950d977633369bf5822d9554Chandler Carruth 4253c268434b332bbe57950d977633369bf5822d9554Chandler Carruth // Don't consider sizes resulting from macro expansions or template argument 4254c268434b332bbe57950d977633369bf5822d9554Chandler Carruth // substitution to form C89 tail-padded arrays. 4255c268434b332bbe57950d977633369bf5822d9554Chandler Carruth ConstantArrayTypeLoc TL = 4256c268434b332bbe57950d977633369bf5822d9554Chandler Carruth cast<ConstantArrayTypeLoc>(FD->getTypeSourceInfo()->getTypeLoc()); 4257c268434b332bbe57950d977633369bf5822d9554Chandler Carruth const Expr *SizeExpr = dyn_cast<IntegerLiteral>(TL.getSizeExpr()); 4258c268434b332bbe57950d977633369bf5822d9554Chandler Carruth if (!SizeExpr || SizeExpr->getExprLoc().isMacroID()) 4259c268434b332bbe57950d977633369bf5822d9554Chandler Carruth return false; 4260c268434b332bbe57950d977633369bf5822d9554Chandler Carruth 4261c268434b332bbe57950d977633369bf5822d9554Chandler Carruth const RecordDecl *RD = dyn_cast<RecordDecl>(FD->getDeclContext()); 4262381711c6e7911d762f81a65e9ef4339a6a3d6524Matt Beaumont-Gay if (!RD) return false; 4263381711c6e7911d762f81a65e9ef4339a6a3d6524Matt Beaumont-Gay if (RD->isUnion()) return false; 4264381711c6e7911d762f81a65e9ef4339a6a3d6524Matt Beaumont-Gay if (const CXXRecordDecl *CRD = dyn_cast<CXXRecordDecl>(RD)) { 4265381711c6e7911d762f81a65e9ef4339a6a3d6524Matt Beaumont-Gay if (!CRD->isStandardLayout()) return false; 4266381711c6e7911d762f81a65e9ef4339a6a3d6524Matt Beaumont-Gay } 4267c268434b332bbe57950d977633369bf5822d9554Chandler Carruth 426822d4fed17df02f5fa07165a69228b0b0f1a73a28Benjamin Kramer // See if this is the last field decl in the record. 426922d4fed17df02f5fa07165a69228b0b0f1a73a28Benjamin Kramer const Decl *D = FD; 427022d4fed17df02f5fa07165a69228b0b0f1a73a28Benjamin Kramer while ((D = D->getNextDeclInContext())) 427122d4fed17df02f5fa07165a69228b0b0f1a73a28Benjamin Kramer if (isa<FieldDecl>(D)) 427222d4fed17df02f5fa07165a69228b0b0f1a73a28Benjamin Kramer return false; 427322d4fed17df02f5fa07165a69228b0b0f1a73a28Benjamin Kramer return true; 4274c268434b332bbe57950d977633369bf5822d9554Chandler Carruth} 4275c268434b332bbe57950d977633369bf5822d9554Chandler Carruth 4276d6c8865e6f306556b7eef972ceec2cc8ba026a0dKaelyn Uhrainvoid Sema::CheckArrayAccess(const Expr *BaseExpr, const Expr *IndexExpr, 427780fb7dd8e0c56632dc68f5864f70abb2fde0e1dfMatt Beaumont-Gay const ArraySubscriptExpr *ASE, 427880fb7dd8e0c56632dc68f5864f70abb2fde0e1dfMatt Beaumont-Gay bool AllowOnePastEnd) { 4279d6c8865e6f306556b7eef972ceec2cc8ba026a0dKaelyn Uhrain IndexExpr = IndexExpr->IgnoreParenCasts(); 428080fb7dd8e0c56632dc68f5864f70abb2fde0e1dfMatt Beaumont-Gay if (IndexExpr->isValueDependent()) 428180fb7dd8e0c56632dc68f5864f70abb2fde0e1dfMatt Beaumont-Gay return; 4282d6c8865e6f306556b7eef972ceec2cc8ba026a0dKaelyn Uhrain 428380fb7dd8e0c56632dc68f5864f70abb2fde0e1dfMatt Beaumont-Gay const Type *EffectiveType = getElementType(BaseExpr); 428480fb7dd8e0c56632dc68f5864f70abb2fde0e1dfMatt Beaumont-Gay BaseExpr = BaseExpr->IgnoreParenCasts(); 42853406458512c3cdfe2076c46b9aedb4621297efd5Chandler Carruth const ConstantArrayType *ArrayTy = 4286d6c8865e6f306556b7eef972ceec2cc8ba026a0dKaelyn Uhrain Context.getAsConstantArrayType(BaseExpr->getType()); 42873406458512c3cdfe2076c46b9aedb4621297efd5Chandler Carruth if (!ArrayTy) 4288a0125d8520f65aca581378c235384e7affefa1fcTed Kremenek return; 428935001ca261f895817916b468379b696d6d45959dChandler Carruth 42903406458512c3cdfe2076c46b9aedb4621297efd5Chandler Carruth llvm::APSInt index; 429180fb7dd8e0c56632dc68f5864f70abb2fde0e1dfMatt Beaumont-Gay if (!IndexExpr->EvaluateAsInt(index, Context)) 4292a0125d8520f65aca581378c235384e7affefa1fcTed Kremenek return; 42938fd0a5dfb025a51f48b7931b95efbf35d3c5dfc3Ted Kremenek 4294ba44712b0e578a851751e199bb75dbbff5836fedChandler Carruth const NamedDecl *ND = NULL; 4295ba44712b0e578a851751e199bb75dbbff5836fedChandler Carruth if (const DeclRefExpr *DRE = dyn_cast<DeclRefExpr>(BaseExpr)) 4296ba44712b0e578a851751e199bb75dbbff5836fedChandler Carruth ND = dyn_cast<NamedDecl>(DRE->getDecl()); 4297c268434b332bbe57950d977633369bf5822d9554Chandler Carruth if (const MemberExpr *ME = dyn_cast<MemberExpr>(BaseExpr)) 4298ba44712b0e578a851751e199bb75dbbff5836fedChandler Carruth ND = dyn_cast<NamedDecl>(ME->getMemberDecl()); 4299ba44712b0e578a851751e199bb75dbbff5836fedChandler Carruth 43009e060ca641a1f845cecb3371b3a3018d306a5198Ted Kremenek if (index.isUnsigned() || !index.isNegative()) { 430125b3b849e3ad340b04442707038c86980035765bTed Kremenek llvm::APInt size = ArrayTy->getSize(); 430235001ca261f895817916b468379b696d6d45959dChandler Carruth if (!size.isStrictlyPositive()) 430335001ca261f895817916b468379b696d6d45959dChandler Carruth return; 4304d6c8865e6f306556b7eef972ceec2cc8ba026a0dKaelyn Uhrain 4305d6c8865e6f306556b7eef972ceec2cc8ba026a0dKaelyn Uhrain const Type* BaseType = getElementType(BaseExpr); 4306de5998f1d7dcecb777257ec932142d65de636eb8Nico Weber if (BaseType != EffectiveType) { 4307d6c8865e6f306556b7eef972ceec2cc8ba026a0dKaelyn Uhrain // Make sure we're comparing apples to apples when comparing index to size 4308d6c8865e6f306556b7eef972ceec2cc8ba026a0dKaelyn Uhrain uint64_t ptrarith_typesize = Context.getTypeSize(EffectiveType); 4309d6c8865e6f306556b7eef972ceec2cc8ba026a0dKaelyn Uhrain uint64_t array_typesize = Context.getTypeSize(BaseType); 4310d10f4bc5a05ce0cdc1646dbb0f706bb9d3dfc0c5Kaelyn Uhrain // Handle ptrarith_typesize being zero, such as when casting to void* 431118f169770d9d3f826bad8f1359c8c5770c5ab16fKaelyn Uhrain if (!ptrarith_typesize) ptrarith_typesize = 1; 4312d6c8865e6f306556b7eef972ceec2cc8ba026a0dKaelyn Uhrain if (ptrarith_typesize != array_typesize) { 4313d6c8865e6f306556b7eef972ceec2cc8ba026a0dKaelyn Uhrain // There's a cast to a different size type involved 4314d6c8865e6f306556b7eef972ceec2cc8ba026a0dKaelyn Uhrain uint64_t ratio = array_typesize / ptrarith_typesize; 4315d6c8865e6f306556b7eef972ceec2cc8ba026a0dKaelyn Uhrain // TODO: Be smarter about handling cases where array_typesize is not a 4316d6c8865e6f306556b7eef972ceec2cc8ba026a0dKaelyn Uhrain // multiple of ptrarith_typesize 4317d6c8865e6f306556b7eef972ceec2cc8ba026a0dKaelyn Uhrain if (ptrarith_typesize * ratio == array_typesize) 4318d6c8865e6f306556b7eef972ceec2cc8ba026a0dKaelyn Uhrain size *= llvm::APInt(size.getBitWidth(), ratio); 4319d6c8865e6f306556b7eef972ceec2cc8ba026a0dKaelyn Uhrain } 4320d6c8865e6f306556b7eef972ceec2cc8ba026a0dKaelyn Uhrain } 4321d6c8865e6f306556b7eef972ceec2cc8ba026a0dKaelyn Uhrain 43223406458512c3cdfe2076c46b9aedb4621297efd5Chandler Carruth if (size.getBitWidth() > index.getBitWidth()) 43233406458512c3cdfe2076c46b9aedb4621297efd5Chandler Carruth index = index.sext(size.getBitWidth()); 432425b3b849e3ad340b04442707038c86980035765bTed Kremenek else if (size.getBitWidth() < index.getBitWidth()) 432525b3b849e3ad340b04442707038c86980035765bTed Kremenek size = size.sext(index.getBitWidth()); 432625b3b849e3ad340b04442707038c86980035765bTed Kremenek 4327d6c8865e6f306556b7eef972ceec2cc8ba026a0dKaelyn Uhrain // For array subscripting the index must be less than size, but for pointer 4328d6c8865e6f306556b7eef972ceec2cc8ba026a0dKaelyn Uhrain // arithmetic also allow the index (offset) to be equal to size since 4329d6c8865e6f306556b7eef972ceec2cc8ba026a0dKaelyn Uhrain // computing the next address after the end of the array is legal and 4330d6c8865e6f306556b7eef972ceec2cc8ba026a0dKaelyn Uhrain // commonly done e.g. in C++ iterators and range-based for loops. 4331d6c8865e6f306556b7eef972ceec2cc8ba026a0dKaelyn Uhrain if (AllowOnePastEnd ? index.sle(size) : index.slt(size)) 4332ba44712b0e578a851751e199bb75dbbff5836fedChandler Carruth return; 4333ba44712b0e578a851751e199bb75dbbff5836fedChandler Carruth 4334ba44712b0e578a851751e199bb75dbbff5836fedChandler Carruth // Also don't warn for arrays of size 1 which are members of some 4335ba44712b0e578a851751e199bb75dbbff5836fedChandler Carruth // structure. These are often used to approximate flexible arrays in C89 4336ba44712b0e578a851751e199bb75dbbff5836fedChandler Carruth // code. 4337d6c8865e6f306556b7eef972ceec2cc8ba026a0dKaelyn Uhrain if (IsTailPaddedMemberArray(*this, size, ND)) 43388fd0a5dfb025a51f48b7931b95efbf35d3c5dfc3Ted Kremenek return; 43393406458512c3cdfe2076c46b9aedb4621297efd5Chandler Carruth 434080fb7dd8e0c56632dc68f5864f70abb2fde0e1dfMatt Beaumont-Gay // Suppress the warning if the subscript expression (as identified by the 434180fb7dd8e0c56632dc68f5864f70abb2fde0e1dfMatt Beaumont-Gay // ']' location) and the index expression are both from macro expansions 434280fb7dd8e0c56632dc68f5864f70abb2fde0e1dfMatt Beaumont-Gay // within a system header. 434380fb7dd8e0c56632dc68f5864f70abb2fde0e1dfMatt Beaumont-Gay if (ASE) { 434480fb7dd8e0c56632dc68f5864f70abb2fde0e1dfMatt Beaumont-Gay SourceLocation RBracketLoc = SourceMgr.getSpellingLoc( 434580fb7dd8e0c56632dc68f5864f70abb2fde0e1dfMatt Beaumont-Gay ASE->getRBracketLoc()); 434680fb7dd8e0c56632dc68f5864f70abb2fde0e1dfMatt Beaumont-Gay if (SourceMgr.isInSystemHeader(RBracketLoc)) { 434780fb7dd8e0c56632dc68f5864f70abb2fde0e1dfMatt Beaumont-Gay SourceLocation IndexLoc = SourceMgr.getSpellingLoc( 434880fb7dd8e0c56632dc68f5864f70abb2fde0e1dfMatt Beaumont-Gay IndexExpr->getLocStart()); 434980fb7dd8e0c56632dc68f5864f70abb2fde0e1dfMatt Beaumont-Gay if (SourceMgr.isFromSameFile(RBracketLoc, IndexLoc)) 435080fb7dd8e0c56632dc68f5864f70abb2fde0e1dfMatt Beaumont-Gay return; 435180fb7dd8e0c56632dc68f5864f70abb2fde0e1dfMatt Beaumont-Gay } 435280fb7dd8e0c56632dc68f5864f70abb2fde0e1dfMatt Beaumont-Gay } 435380fb7dd8e0c56632dc68f5864f70abb2fde0e1dfMatt Beaumont-Gay 4354d6c8865e6f306556b7eef972ceec2cc8ba026a0dKaelyn Uhrain unsigned DiagID = diag::warn_ptr_arith_exceeds_bounds; 435580fb7dd8e0c56632dc68f5864f70abb2fde0e1dfMatt Beaumont-Gay if (ASE) 4356d6c8865e6f306556b7eef972ceec2cc8ba026a0dKaelyn Uhrain DiagID = diag::warn_array_index_exceeds_bounds; 4357d6c8865e6f306556b7eef972ceec2cc8ba026a0dKaelyn Uhrain 4358d6c8865e6f306556b7eef972ceec2cc8ba026a0dKaelyn Uhrain DiagRuntimeBehavior(BaseExpr->getLocStart(), BaseExpr, 4359d6c8865e6f306556b7eef972ceec2cc8ba026a0dKaelyn Uhrain PDiag(DiagID) << index.toString(10, true) 4360d6c8865e6f306556b7eef972ceec2cc8ba026a0dKaelyn Uhrain << size.toString(10, true) 4361d6c8865e6f306556b7eef972ceec2cc8ba026a0dKaelyn Uhrain << (unsigned)size.getLimitedValue(~0U) 4362d6c8865e6f306556b7eef972ceec2cc8ba026a0dKaelyn Uhrain << IndexExpr->getSourceRange()); 43633406458512c3cdfe2076c46b9aedb4621297efd5Chandler Carruth } else { 4364d6c8865e6f306556b7eef972ceec2cc8ba026a0dKaelyn Uhrain unsigned DiagID = diag::warn_array_index_precedes_bounds; 436580fb7dd8e0c56632dc68f5864f70abb2fde0e1dfMatt Beaumont-Gay if (!ASE) { 4366d6c8865e6f306556b7eef972ceec2cc8ba026a0dKaelyn Uhrain DiagID = diag::warn_ptr_arith_precedes_bounds; 4367d6c8865e6f306556b7eef972ceec2cc8ba026a0dKaelyn Uhrain if (index.isNegative()) index = -index; 4368d6c8865e6f306556b7eef972ceec2cc8ba026a0dKaelyn Uhrain } 4369d6c8865e6f306556b7eef972ceec2cc8ba026a0dKaelyn Uhrain 4370d6c8865e6f306556b7eef972ceec2cc8ba026a0dKaelyn Uhrain DiagRuntimeBehavior(BaseExpr->getLocStart(), BaseExpr, 4371d6c8865e6f306556b7eef972ceec2cc8ba026a0dKaelyn Uhrain PDiag(DiagID) << index.toString(10, true) 4372d6c8865e6f306556b7eef972ceec2cc8ba026a0dKaelyn Uhrain << IndexExpr->getSourceRange()); 4373a0125d8520f65aca581378c235384e7affefa1fcTed Kremenek } 437435001ca261f895817916b468379b696d6d45959dChandler Carruth 4375cfbc5b5660f49fae63acc1f5ef05df87070a2a3cMatt Beaumont-Gay if (!ND) { 4376cfbc5b5660f49fae63acc1f5ef05df87070a2a3cMatt Beaumont-Gay // Try harder to find a NamedDecl to point at in the note. 4377cfbc5b5660f49fae63acc1f5ef05df87070a2a3cMatt Beaumont-Gay while (const ArraySubscriptExpr *ASE = 4378cfbc5b5660f49fae63acc1f5ef05df87070a2a3cMatt Beaumont-Gay dyn_cast<ArraySubscriptExpr>(BaseExpr)) 4379cfbc5b5660f49fae63acc1f5ef05df87070a2a3cMatt Beaumont-Gay BaseExpr = ASE->getBase()->IgnoreParenCasts(); 4380cfbc5b5660f49fae63acc1f5ef05df87070a2a3cMatt Beaumont-Gay if (const DeclRefExpr *DRE = dyn_cast<DeclRefExpr>(BaseExpr)) 4381cfbc5b5660f49fae63acc1f5ef05df87070a2a3cMatt Beaumont-Gay ND = dyn_cast<NamedDecl>(DRE->getDecl()); 4382cfbc5b5660f49fae63acc1f5ef05df87070a2a3cMatt Beaumont-Gay if (const MemberExpr *ME = dyn_cast<MemberExpr>(BaseExpr)) 4383cfbc5b5660f49fae63acc1f5ef05df87070a2a3cMatt Beaumont-Gay ND = dyn_cast<NamedDecl>(ME->getMemberDecl()); 4384cfbc5b5660f49fae63acc1f5ef05df87070a2a3cMatt Beaumont-Gay } 4385cfbc5b5660f49fae63acc1f5ef05df87070a2a3cMatt Beaumont-Gay 438635001ca261f895817916b468379b696d6d45959dChandler Carruth if (ND) 4387d6c8865e6f306556b7eef972ceec2cc8ba026a0dKaelyn Uhrain DiagRuntimeBehavior(ND->getLocStart(), BaseExpr, 4388d6c8865e6f306556b7eef972ceec2cc8ba026a0dKaelyn Uhrain PDiag(diag::note_array_index_out_of_bounds) 4389d6c8865e6f306556b7eef972ceec2cc8ba026a0dKaelyn Uhrain << ND->getDeclName()); 43903aea4dac830cb03d883a13ab30c28a3a53beca58Ted Kremenek} 43913aea4dac830cb03d883a13ab30c28a3a53beca58Ted Kremenek 43923aea4dac830cb03d883a13ab30c28a3a53beca58Ted Kremenekvoid Sema::CheckArrayAccess(const Expr *expr) { 4393d6c8865e6f306556b7eef972ceec2cc8ba026a0dKaelyn Uhrain int AllowOnePastEnd = 0; 4394d6c8865e6f306556b7eef972ceec2cc8ba026a0dKaelyn Uhrain while (expr) { 4395d6c8865e6f306556b7eef972ceec2cc8ba026a0dKaelyn Uhrain expr = expr->IgnoreParenImpCasts(); 43963aea4dac830cb03d883a13ab30c28a3a53beca58Ted Kremenek switch (expr->getStmtClass()) { 4397d6c8865e6f306556b7eef972ceec2cc8ba026a0dKaelyn Uhrain case Stmt::ArraySubscriptExprClass: { 4398d6c8865e6f306556b7eef972ceec2cc8ba026a0dKaelyn Uhrain const ArraySubscriptExpr *ASE = cast<ArraySubscriptExpr>(expr); 439980fb7dd8e0c56632dc68f5864f70abb2fde0e1dfMatt Beaumont-Gay CheckArrayAccess(ASE->getBase(), ASE->getIdx(), ASE, 4400d6c8865e6f306556b7eef972ceec2cc8ba026a0dKaelyn Uhrain AllowOnePastEnd > 0); 44013aea4dac830cb03d883a13ab30c28a3a53beca58Ted Kremenek return; 4402d6c8865e6f306556b7eef972ceec2cc8ba026a0dKaelyn Uhrain } 4403d6c8865e6f306556b7eef972ceec2cc8ba026a0dKaelyn Uhrain case Stmt::UnaryOperatorClass: { 4404d6c8865e6f306556b7eef972ceec2cc8ba026a0dKaelyn Uhrain // Only unwrap the * and & unary operators 4405d6c8865e6f306556b7eef972ceec2cc8ba026a0dKaelyn Uhrain const UnaryOperator *UO = cast<UnaryOperator>(expr); 4406d6c8865e6f306556b7eef972ceec2cc8ba026a0dKaelyn Uhrain expr = UO->getSubExpr(); 4407d6c8865e6f306556b7eef972ceec2cc8ba026a0dKaelyn Uhrain switch (UO->getOpcode()) { 4408d6c8865e6f306556b7eef972ceec2cc8ba026a0dKaelyn Uhrain case UO_AddrOf: 4409d6c8865e6f306556b7eef972ceec2cc8ba026a0dKaelyn Uhrain AllowOnePastEnd++; 4410d6c8865e6f306556b7eef972ceec2cc8ba026a0dKaelyn Uhrain break; 4411d6c8865e6f306556b7eef972ceec2cc8ba026a0dKaelyn Uhrain case UO_Deref: 4412d6c8865e6f306556b7eef972ceec2cc8ba026a0dKaelyn Uhrain AllowOnePastEnd--; 4413d6c8865e6f306556b7eef972ceec2cc8ba026a0dKaelyn Uhrain break; 4414d6c8865e6f306556b7eef972ceec2cc8ba026a0dKaelyn Uhrain default: 4415d6c8865e6f306556b7eef972ceec2cc8ba026a0dKaelyn Uhrain return; 4416d6c8865e6f306556b7eef972ceec2cc8ba026a0dKaelyn Uhrain } 4417d6c8865e6f306556b7eef972ceec2cc8ba026a0dKaelyn Uhrain break; 4418d6c8865e6f306556b7eef972ceec2cc8ba026a0dKaelyn Uhrain } 44193aea4dac830cb03d883a13ab30c28a3a53beca58Ted Kremenek case Stmt::ConditionalOperatorClass: { 44203aea4dac830cb03d883a13ab30c28a3a53beca58Ted Kremenek const ConditionalOperator *cond = cast<ConditionalOperator>(expr); 44213aea4dac830cb03d883a13ab30c28a3a53beca58Ted Kremenek if (const Expr *lhs = cond->getLHS()) 44223aea4dac830cb03d883a13ab30c28a3a53beca58Ted Kremenek CheckArrayAccess(lhs); 44233aea4dac830cb03d883a13ab30c28a3a53beca58Ted Kremenek if (const Expr *rhs = cond->getRHS()) 44243aea4dac830cb03d883a13ab30c28a3a53beca58Ted Kremenek CheckArrayAccess(rhs); 44253aea4dac830cb03d883a13ab30c28a3a53beca58Ted Kremenek return; 44263aea4dac830cb03d883a13ab30c28a3a53beca58Ted Kremenek } 44273aea4dac830cb03d883a13ab30c28a3a53beca58Ted Kremenek default: 44283aea4dac830cb03d883a13ab30c28a3a53beca58Ted Kremenek return; 44293aea4dac830cb03d883a13ab30c28a3a53beca58Ted Kremenek } 4430f111d935722ed488144600cea5ed03a6b5069e8fPeter Collingbourne } 4431a0125d8520f65aca581378c235384e7affefa1fcTed Kremenek} 4432f85e193739c953358c865005855253af4f68a497John McCall 4433f85e193739c953358c865005855253af4f68a497John McCall//===--- CHECK: Objective-C retain cycles ----------------------------------// 4434f85e193739c953358c865005855253af4f68a497John McCall 4435f85e193739c953358c865005855253af4f68a497John McCallnamespace { 4436f85e193739c953358c865005855253af4f68a497John McCall struct RetainCycleOwner { 4437f85e193739c953358c865005855253af4f68a497John McCall RetainCycleOwner() : Variable(0), Indirect(false) {} 4438f85e193739c953358c865005855253af4f68a497John McCall VarDecl *Variable; 4439f85e193739c953358c865005855253af4f68a497John McCall SourceRange Range; 4440f85e193739c953358c865005855253af4f68a497John McCall SourceLocation Loc; 4441f85e193739c953358c865005855253af4f68a497John McCall bool Indirect; 4442f85e193739c953358c865005855253af4f68a497John McCall 4443f85e193739c953358c865005855253af4f68a497John McCall void setLocsFrom(Expr *e) { 4444f85e193739c953358c865005855253af4f68a497John McCall Loc = e->getExprLoc(); 4445f85e193739c953358c865005855253af4f68a497John McCall Range = e->getSourceRange(); 4446f85e193739c953358c865005855253af4f68a497John McCall } 4447f85e193739c953358c865005855253af4f68a497John McCall }; 4448f85e193739c953358c865005855253af4f68a497John McCall} 4449f85e193739c953358c865005855253af4f68a497John McCall 4450f85e193739c953358c865005855253af4f68a497John McCall/// Consider whether capturing the given variable can possibly lead to 4451f85e193739c953358c865005855253af4f68a497John McCall/// a retain cycle. 4452f85e193739c953358c865005855253af4f68a497John McCallstatic bool considerVariable(VarDecl *var, Expr *ref, RetainCycleOwner &owner) { 4453f85e193739c953358c865005855253af4f68a497John McCall // In ARC, it's captured strongly iff the variable has __strong 4454f85e193739c953358c865005855253af4f68a497John McCall // lifetime. In MRR, it's captured strongly if the variable is 4455f85e193739c953358c865005855253af4f68a497John McCall // __block and has an appropriate type. 4456f85e193739c953358c865005855253af4f68a497John McCall if (var->getType().getObjCLifetime() != Qualifiers::OCL_Strong) 4457f85e193739c953358c865005855253af4f68a497John McCall return false; 4458f85e193739c953358c865005855253af4f68a497John McCall 4459f85e193739c953358c865005855253af4f68a497John McCall owner.Variable = var; 4460f85e193739c953358c865005855253af4f68a497John McCall owner.setLocsFrom(ref); 4461f85e193739c953358c865005855253af4f68a497John McCall return true; 4462f85e193739c953358c865005855253af4f68a497John McCall} 4463f85e193739c953358c865005855253af4f68a497John McCall 4464f85e193739c953358c865005855253af4f68a497John McCallstatic bool findRetainCycleOwner(Expr *e, RetainCycleOwner &owner) { 4465f85e193739c953358c865005855253af4f68a497John McCall while (true) { 4466f85e193739c953358c865005855253af4f68a497John McCall e = e->IgnoreParens(); 4467f85e193739c953358c865005855253af4f68a497John McCall if (CastExpr *cast = dyn_cast<CastExpr>(e)) { 4468f85e193739c953358c865005855253af4f68a497John McCall switch (cast->getCastKind()) { 4469f85e193739c953358c865005855253af4f68a497John McCall case CK_BitCast: 4470f85e193739c953358c865005855253af4f68a497John McCall case CK_LValueBitCast: 4471f85e193739c953358c865005855253af4f68a497John McCall case CK_LValueToRValue: 447233e56f3273457bfa22c7c50bc46cf5a18216863dJohn McCall case CK_ARCReclaimReturnedObject: 4473f85e193739c953358c865005855253af4f68a497John McCall e = cast->getSubExpr(); 4474f85e193739c953358c865005855253af4f68a497John McCall continue; 4475f85e193739c953358c865005855253af4f68a497John McCall 4476f85e193739c953358c865005855253af4f68a497John McCall default: 4477f85e193739c953358c865005855253af4f68a497John McCall return false; 4478f85e193739c953358c865005855253af4f68a497John McCall } 4479f85e193739c953358c865005855253af4f68a497John McCall } 4480f85e193739c953358c865005855253af4f68a497John McCall 4481f85e193739c953358c865005855253af4f68a497John McCall if (ObjCIvarRefExpr *ref = dyn_cast<ObjCIvarRefExpr>(e)) { 4482f85e193739c953358c865005855253af4f68a497John McCall ObjCIvarDecl *ivar = ref->getDecl(); 4483f85e193739c953358c865005855253af4f68a497John McCall if (ivar->getType().getObjCLifetime() != Qualifiers::OCL_Strong) 4484f85e193739c953358c865005855253af4f68a497John McCall return false; 4485f85e193739c953358c865005855253af4f68a497John McCall 4486f85e193739c953358c865005855253af4f68a497John McCall // Try to find a retain cycle in the base. 4487f85e193739c953358c865005855253af4f68a497John McCall if (!findRetainCycleOwner(ref->getBase(), owner)) 4488f85e193739c953358c865005855253af4f68a497John McCall return false; 4489f85e193739c953358c865005855253af4f68a497John McCall 4490f85e193739c953358c865005855253af4f68a497John McCall if (ref->isFreeIvar()) owner.setLocsFrom(ref); 4491f85e193739c953358c865005855253af4f68a497John McCall owner.Indirect = true; 4492f85e193739c953358c865005855253af4f68a497John McCall return true; 4493f85e193739c953358c865005855253af4f68a497John McCall } 4494f85e193739c953358c865005855253af4f68a497John McCall 4495f85e193739c953358c865005855253af4f68a497John McCall if (DeclRefExpr *ref = dyn_cast<DeclRefExpr>(e)) { 4496f85e193739c953358c865005855253af4f68a497John McCall VarDecl *var = dyn_cast<VarDecl>(ref->getDecl()); 4497f85e193739c953358c865005855253af4f68a497John McCall if (!var) return false; 4498f85e193739c953358c865005855253af4f68a497John McCall return considerVariable(var, ref, owner); 4499f85e193739c953358c865005855253af4f68a497John McCall } 4500f85e193739c953358c865005855253af4f68a497John McCall 4501f85e193739c953358c865005855253af4f68a497John McCall if (BlockDeclRefExpr *ref = dyn_cast<BlockDeclRefExpr>(e)) { 4502f85e193739c953358c865005855253af4f68a497John McCall owner.Variable = ref->getDecl(); 4503f85e193739c953358c865005855253af4f68a497John McCall owner.setLocsFrom(ref); 4504f85e193739c953358c865005855253af4f68a497John McCall return true; 4505f85e193739c953358c865005855253af4f68a497John McCall } 4506f85e193739c953358c865005855253af4f68a497John McCall 4507f85e193739c953358c865005855253af4f68a497John McCall if (MemberExpr *member = dyn_cast<MemberExpr>(e)) { 4508f85e193739c953358c865005855253af4f68a497John McCall if (member->isArrow()) return false; 4509f85e193739c953358c865005855253af4f68a497John McCall 4510f85e193739c953358c865005855253af4f68a497John McCall // Don't count this as an indirect ownership. 4511f85e193739c953358c865005855253af4f68a497John McCall e = member->getBase(); 4512f85e193739c953358c865005855253af4f68a497John McCall continue; 4513f85e193739c953358c865005855253af4f68a497John McCall } 4514f85e193739c953358c865005855253af4f68a497John McCall 45154b9c2d235fb9449e249d74f48ecfec601650de93John McCall if (PseudoObjectExpr *pseudo = dyn_cast<PseudoObjectExpr>(e)) { 45164b9c2d235fb9449e249d74f48ecfec601650de93John McCall // Only pay attention to pseudo-objects on property references. 45174b9c2d235fb9449e249d74f48ecfec601650de93John McCall ObjCPropertyRefExpr *pre 45184b9c2d235fb9449e249d74f48ecfec601650de93John McCall = dyn_cast<ObjCPropertyRefExpr>(pseudo->getSyntacticForm() 45194b9c2d235fb9449e249d74f48ecfec601650de93John McCall ->IgnoreParens()); 45204b9c2d235fb9449e249d74f48ecfec601650de93John McCall if (!pre) return false; 45214b9c2d235fb9449e249d74f48ecfec601650de93John McCall if (pre->isImplicitProperty()) return false; 45224b9c2d235fb9449e249d74f48ecfec601650de93John McCall ObjCPropertyDecl *property = pre->getExplicitProperty(); 45234b9c2d235fb9449e249d74f48ecfec601650de93John McCall if (!property->isRetaining() && 45244b9c2d235fb9449e249d74f48ecfec601650de93John McCall !(property->getPropertyIvarDecl() && 45254b9c2d235fb9449e249d74f48ecfec601650de93John McCall property->getPropertyIvarDecl()->getType() 45264b9c2d235fb9449e249d74f48ecfec601650de93John McCall .getObjCLifetime() == Qualifiers::OCL_Strong)) 45274b9c2d235fb9449e249d74f48ecfec601650de93John McCall return false; 45284b9c2d235fb9449e249d74f48ecfec601650de93John McCall 45294b9c2d235fb9449e249d74f48ecfec601650de93John McCall owner.Indirect = true; 45304b9c2d235fb9449e249d74f48ecfec601650de93John McCall e = const_cast<Expr*>(cast<OpaqueValueExpr>(pre->getBase()) 45314b9c2d235fb9449e249d74f48ecfec601650de93John McCall ->getSourceExpr()); 45324b9c2d235fb9449e249d74f48ecfec601650de93John McCall continue; 45334b9c2d235fb9449e249d74f48ecfec601650de93John McCall } 45344b9c2d235fb9449e249d74f48ecfec601650de93John McCall 4535f85e193739c953358c865005855253af4f68a497John McCall // Array ivars? 4536f85e193739c953358c865005855253af4f68a497John McCall 4537f85e193739c953358c865005855253af4f68a497John McCall return false; 4538f85e193739c953358c865005855253af4f68a497John McCall } 4539f85e193739c953358c865005855253af4f68a497John McCall} 4540f85e193739c953358c865005855253af4f68a497John McCall 4541f85e193739c953358c865005855253af4f68a497John McCallnamespace { 4542f85e193739c953358c865005855253af4f68a497John McCall struct FindCaptureVisitor : EvaluatedExprVisitor<FindCaptureVisitor> { 4543f85e193739c953358c865005855253af4f68a497John McCall FindCaptureVisitor(ASTContext &Context, VarDecl *variable) 4544f85e193739c953358c865005855253af4f68a497John McCall : EvaluatedExprVisitor<FindCaptureVisitor>(Context), 4545f85e193739c953358c865005855253af4f68a497John McCall Variable(variable), Capturer(0) {} 4546f85e193739c953358c865005855253af4f68a497John McCall 4547f85e193739c953358c865005855253af4f68a497John McCall VarDecl *Variable; 4548f85e193739c953358c865005855253af4f68a497John McCall Expr *Capturer; 4549f85e193739c953358c865005855253af4f68a497John McCall 4550f85e193739c953358c865005855253af4f68a497John McCall void VisitDeclRefExpr(DeclRefExpr *ref) { 4551f85e193739c953358c865005855253af4f68a497John McCall if (ref->getDecl() == Variable && !Capturer) 4552f85e193739c953358c865005855253af4f68a497John McCall Capturer = ref; 4553f85e193739c953358c865005855253af4f68a497John McCall } 4554f85e193739c953358c865005855253af4f68a497John McCall 4555f85e193739c953358c865005855253af4f68a497John McCall void VisitBlockDeclRefExpr(BlockDeclRefExpr *ref) { 4556f85e193739c953358c865005855253af4f68a497John McCall if (ref->getDecl() == Variable && !Capturer) 4557f85e193739c953358c865005855253af4f68a497John McCall Capturer = ref; 4558f85e193739c953358c865005855253af4f68a497John McCall } 4559f85e193739c953358c865005855253af4f68a497John McCall 4560f85e193739c953358c865005855253af4f68a497John McCall void VisitObjCIvarRefExpr(ObjCIvarRefExpr *ref) { 4561f85e193739c953358c865005855253af4f68a497John McCall if (Capturer) return; 4562f85e193739c953358c865005855253af4f68a497John McCall Visit(ref->getBase()); 4563f85e193739c953358c865005855253af4f68a497John McCall if (Capturer && ref->isFreeIvar()) 4564f85e193739c953358c865005855253af4f68a497John McCall Capturer = ref; 4565f85e193739c953358c865005855253af4f68a497John McCall } 4566f85e193739c953358c865005855253af4f68a497John McCall 4567f85e193739c953358c865005855253af4f68a497John McCall void VisitBlockExpr(BlockExpr *block) { 4568f85e193739c953358c865005855253af4f68a497John McCall // Look inside nested blocks 4569f85e193739c953358c865005855253af4f68a497John McCall if (block->getBlockDecl()->capturesVariable(Variable)) 4570f85e193739c953358c865005855253af4f68a497John McCall Visit(block->getBlockDecl()->getBody()); 4571f85e193739c953358c865005855253af4f68a497John McCall } 4572f85e193739c953358c865005855253af4f68a497John McCall }; 4573f85e193739c953358c865005855253af4f68a497John McCall} 4574f85e193739c953358c865005855253af4f68a497John McCall 4575f85e193739c953358c865005855253af4f68a497John McCall/// Check whether the given argument is a block which captures a 4576f85e193739c953358c865005855253af4f68a497John McCall/// variable. 4577f85e193739c953358c865005855253af4f68a497John McCallstatic Expr *findCapturingExpr(Sema &S, Expr *e, RetainCycleOwner &owner) { 4578f85e193739c953358c865005855253af4f68a497John McCall assert(owner.Variable && owner.Loc.isValid()); 4579f85e193739c953358c865005855253af4f68a497John McCall 4580f85e193739c953358c865005855253af4f68a497John McCall e = e->IgnoreParenCasts(); 4581f85e193739c953358c865005855253af4f68a497John McCall BlockExpr *block = dyn_cast<BlockExpr>(e); 4582f85e193739c953358c865005855253af4f68a497John McCall if (!block || !block->getBlockDecl()->capturesVariable(owner.Variable)) 4583f85e193739c953358c865005855253af4f68a497John McCall return 0; 4584f85e193739c953358c865005855253af4f68a497John McCall 4585f85e193739c953358c865005855253af4f68a497John McCall FindCaptureVisitor visitor(S.Context, owner.Variable); 4586f85e193739c953358c865005855253af4f68a497John McCall visitor.Visit(block->getBlockDecl()->getBody()); 4587f85e193739c953358c865005855253af4f68a497John McCall return visitor.Capturer; 4588f85e193739c953358c865005855253af4f68a497John McCall} 4589f85e193739c953358c865005855253af4f68a497John McCall 4590f85e193739c953358c865005855253af4f68a497John McCallstatic void diagnoseRetainCycle(Sema &S, Expr *capturer, 4591f85e193739c953358c865005855253af4f68a497John McCall RetainCycleOwner &owner) { 4592f85e193739c953358c865005855253af4f68a497John McCall assert(capturer); 4593f85e193739c953358c865005855253af4f68a497John McCall assert(owner.Variable && owner.Loc.isValid()); 4594f85e193739c953358c865005855253af4f68a497John McCall 4595f85e193739c953358c865005855253af4f68a497John McCall S.Diag(capturer->getExprLoc(), diag::warn_arc_retain_cycle) 4596f85e193739c953358c865005855253af4f68a497John McCall << owner.Variable << capturer->getSourceRange(); 4597f85e193739c953358c865005855253af4f68a497John McCall S.Diag(owner.Loc, diag::note_arc_retain_cycle_owner) 4598f85e193739c953358c865005855253af4f68a497John McCall << owner.Indirect << owner.Range; 4599f85e193739c953358c865005855253af4f68a497John McCall} 4600f85e193739c953358c865005855253af4f68a497John McCall 4601f85e193739c953358c865005855253af4f68a497John McCall/// Check for a keyword selector that starts with the word 'add' or 4602f85e193739c953358c865005855253af4f68a497John McCall/// 'set'. 4603f85e193739c953358c865005855253af4f68a497John McCallstatic bool isSetterLikeSelector(Selector sel) { 4604f85e193739c953358c865005855253af4f68a497John McCall if (sel.isUnarySelector()) return false; 4605f85e193739c953358c865005855253af4f68a497John McCall 46065f9e272e632e951b1efe824cd16acb4d96077930Chris Lattner StringRef str = sel.getNameForSlot(0); 4607f85e193739c953358c865005855253af4f68a497John McCall while (!str.empty() && str.front() == '_') str = str.substr(1); 4608968a0ee9d98549308e3e70e787e4fd669d2a829dTed Kremenek if (str.startswith("set")) 4609f85e193739c953358c865005855253af4f68a497John McCall str = str.substr(3); 4610968a0ee9d98549308e3e70e787e4fd669d2a829dTed Kremenek else if (str.startswith("add")) { 4611968a0ee9d98549308e3e70e787e4fd669d2a829dTed Kremenek // Specially whitelist 'addOperationWithBlock:'. 4612968a0ee9d98549308e3e70e787e4fd669d2a829dTed Kremenek if (sel.getNumArgs() == 1 && str.startswith("addOperationWithBlock")) 4613968a0ee9d98549308e3e70e787e4fd669d2a829dTed Kremenek return false; 4614968a0ee9d98549308e3e70e787e4fd669d2a829dTed Kremenek str = str.substr(3); 4615968a0ee9d98549308e3e70e787e4fd669d2a829dTed Kremenek } 4616f85e193739c953358c865005855253af4f68a497John McCall else 4617f85e193739c953358c865005855253af4f68a497John McCall return false; 4618f85e193739c953358c865005855253af4f68a497John McCall 4619f85e193739c953358c865005855253af4f68a497John McCall if (str.empty()) return true; 4620f85e193739c953358c865005855253af4f68a497John McCall return !islower(str.front()); 4621f85e193739c953358c865005855253af4f68a497John McCall} 4622f85e193739c953358c865005855253af4f68a497John McCall 4623f85e193739c953358c865005855253af4f68a497John McCall/// Check a message send to see if it's likely to cause a retain cycle. 4624f85e193739c953358c865005855253af4f68a497John McCallvoid Sema::checkRetainCycles(ObjCMessageExpr *msg) { 4625f85e193739c953358c865005855253af4f68a497John McCall // Only check instance methods whose selector looks like a setter. 4626f85e193739c953358c865005855253af4f68a497John McCall if (!msg->isInstanceMessage() || !isSetterLikeSelector(msg->getSelector())) 4627f85e193739c953358c865005855253af4f68a497John McCall return; 4628f85e193739c953358c865005855253af4f68a497John McCall 4629f85e193739c953358c865005855253af4f68a497John McCall // Try to find a variable that the receiver is strongly owned by. 4630f85e193739c953358c865005855253af4f68a497John McCall RetainCycleOwner owner; 4631f85e193739c953358c865005855253af4f68a497John McCall if (msg->getReceiverKind() == ObjCMessageExpr::Instance) { 4632f85e193739c953358c865005855253af4f68a497John McCall if (!findRetainCycleOwner(msg->getInstanceReceiver(), owner)) 4633f85e193739c953358c865005855253af4f68a497John McCall return; 4634f85e193739c953358c865005855253af4f68a497John McCall } else { 4635f85e193739c953358c865005855253af4f68a497John McCall assert(msg->getReceiverKind() == ObjCMessageExpr::SuperInstance); 4636f85e193739c953358c865005855253af4f68a497John McCall owner.Variable = getCurMethodDecl()->getSelfDecl(); 4637f85e193739c953358c865005855253af4f68a497John McCall owner.Loc = msg->getSuperLoc(); 4638f85e193739c953358c865005855253af4f68a497John McCall owner.Range = msg->getSuperLoc(); 4639f85e193739c953358c865005855253af4f68a497John McCall } 4640f85e193739c953358c865005855253af4f68a497John McCall 4641f85e193739c953358c865005855253af4f68a497John McCall // Check whether the receiver is captured by any of the arguments. 4642f85e193739c953358c865005855253af4f68a497John McCall for (unsigned i = 0, e = msg->getNumArgs(); i != e; ++i) 4643f85e193739c953358c865005855253af4f68a497John McCall if (Expr *capturer = findCapturingExpr(*this, msg->getArg(i), owner)) 4644f85e193739c953358c865005855253af4f68a497John McCall return diagnoseRetainCycle(*this, capturer, owner); 4645f85e193739c953358c865005855253af4f68a497John McCall} 4646f85e193739c953358c865005855253af4f68a497John McCall 4647f85e193739c953358c865005855253af4f68a497John McCall/// Check a property assign to see if it's likely to cause a retain cycle. 4648f85e193739c953358c865005855253af4f68a497John McCallvoid Sema::checkRetainCycles(Expr *receiver, Expr *argument) { 4649f85e193739c953358c865005855253af4f68a497John McCall RetainCycleOwner owner; 4650f85e193739c953358c865005855253af4f68a497John McCall if (!findRetainCycleOwner(receiver, owner)) 4651f85e193739c953358c865005855253af4f68a497John McCall return; 4652f85e193739c953358c865005855253af4f68a497John McCall 4653f85e193739c953358c865005855253af4f68a497John McCall if (Expr *capturer = findCapturingExpr(*this, argument, owner)) 4654f85e193739c953358c865005855253af4f68a497John McCall diagnoseRetainCycle(*this, capturer, owner); 4655f85e193739c953358c865005855253af4f68a497John McCall} 4656f85e193739c953358c865005855253af4f68a497John McCall 4657921c14322977253a60dcb171f45e468c95fe41f8Fariborz Jahanianbool Sema::checkUnsafeAssigns(SourceLocation Loc, 4658f85e193739c953358c865005855253af4f68a497John McCall QualType LHS, Expr *RHS) { 4659f85e193739c953358c865005855253af4f68a497John McCall Qualifiers::ObjCLifetime LT = LHS.getObjCLifetime(); 4660f85e193739c953358c865005855253af4f68a497John McCall if (LT != Qualifiers::OCL_Weak && LT != Qualifiers::OCL_ExplicitNone) 4661921c14322977253a60dcb171f45e468c95fe41f8Fariborz Jahanian return false; 4662921c14322977253a60dcb171f45e468c95fe41f8Fariborz Jahanian // strip off any implicit cast added to get to the one arc-specific 4663921c14322977253a60dcb171f45e468c95fe41f8Fariborz Jahanian while (ImplicitCastExpr *cast = dyn_cast<ImplicitCastExpr>(RHS)) { 466433e56f3273457bfa22c7c50bc46cf5a18216863dJohn McCall if (cast->getCastKind() == CK_ARCConsumeObject) { 4665f85e193739c953358c865005855253af4f68a497John McCall Diag(Loc, diag::warn_arc_retained_assign) 4666f85e193739c953358c865005855253af4f68a497John McCall << (LT == Qualifiers::OCL_ExplicitNone) 4667f85e193739c953358c865005855253af4f68a497John McCall << RHS->getSourceRange(); 4668921c14322977253a60dcb171f45e468c95fe41f8Fariborz Jahanian return true; 4669921c14322977253a60dcb171f45e468c95fe41f8Fariborz Jahanian } 4670921c14322977253a60dcb171f45e468c95fe41f8Fariborz Jahanian RHS = cast->getSubExpr(); 4671921c14322977253a60dcb171f45e468c95fe41f8Fariborz Jahanian } 4672921c14322977253a60dcb171f45e468c95fe41f8Fariborz Jahanian return false; 4673f85e193739c953358c865005855253af4f68a497John McCall} 4674f85e193739c953358c865005855253af4f68a497John McCall 4675921c14322977253a60dcb171f45e468c95fe41f8Fariborz Jahanianvoid Sema::checkUnsafeExprAssigns(SourceLocation Loc, 4676921c14322977253a60dcb171f45e468c95fe41f8Fariborz Jahanian Expr *LHS, Expr *RHS) { 4677921c14322977253a60dcb171f45e468c95fe41f8Fariborz Jahanian QualType LHSType = LHS->getType(); 4678921c14322977253a60dcb171f45e468c95fe41f8Fariborz Jahanian if (checkUnsafeAssigns(Loc, LHSType, RHS)) 4679921c14322977253a60dcb171f45e468c95fe41f8Fariborz Jahanian return; 4680921c14322977253a60dcb171f45e468c95fe41f8Fariborz Jahanian Qualifiers::ObjCLifetime LT = LHSType.getObjCLifetime(); 4681921c14322977253a60dcb171f45e468c95fe41f8Fariborz Jahanian // FIXME. Check for other life times. 4682921c14322977253a60dcb171f45e468c95fe41f8Fariborz Jahanian if (LT != Qualifiers::OCL_None) 4683921c14322977253a60dcb171f45e468c95fe41f8Fariborz Jahanian return; 4684921c14322977253a60dcb171f45e468c95fe41f8Fariborz Jahanian 46853c3b7f90a863af43fa63043d396553ecf205351cJohn McCall if (ObjCPropertyRefExpr *PRE 46863c3b7f90a863af43fa63043d396553ecf205351cJohn McCall = dyn_cast<ObjCPropertyRefExpr>(LHS->IgnoreParens())) { 4687921c14322977253a60dcb171f45e468c95fe41f8Fariborz Jahanian if (PRE->isImplicitProperty()) 4688921c14322977253a60dcb171f45e468c95fe41f8Fariborz Jahanian return; 4689921c14322977253a60dcb171f45e468c95fe41f8Fariborz Jahanian const ObjCPropertyDecl *PD = PRE->getExplicitProperty(); 4690921c14322977253a60dcb171f45e468c95fe41f8Fariborz Jahanian if (!PD) 4691921c14322977253a60dcb171f45e468c95fe41f8Fariborz Jahanian return; 4692921c14322977253a60dcb171f45e468c95fe41f8Fariborz Jahanian 4693921c14322977253a60dcb171f45e468c95fe41f8Fariborz Jahanian unsigned Attributes = PD->getPropertyAttributes(); 4694921c14322977253a60dcb171f45e468c95fe41f8Fariborz Jahanian if (Attributes & ObjCPropertyDecl::OBJC_PR_assign) 4695921c14322977253a60dcb171f45e468c95fe41f8Fariborz Jahanian while (ImplicitCastExpr *cast = dyn_cast<ImplicitCastExpr>(RHS)) { 469633e56f3273457bfa22c7c50bc46cf5a18216863dJohn McCall if (cast->getCastKind() == CK_ARCConsumeObject) { 4697921c14322977253a60dcb171f45e468c95fe41f8Fariborz Jahanian Diag(Loc, diag::warn_arc_retained_property_assign) 4698921c14322977253a60dcb171f45e468c95fe41f8Fariborz Jahanian << RHS->getSourceRange(); 4699921c14322977253a60dcb171f45e468c95fe41f8Fariborz Jahanian return; 4700921c14322977253a60dcb171f45e468c95fe41f8Fariborz Jahanian } 4701921c14322977253a60dcb171f45e468c95fe41f8Fariborz Jahanian RHS = cast->getSubExpr(); 4702921c14322977253a60dcb171f45e468c95fe41f8Fariborz Jahanian } 4703921c14322977253a60dcb171f45e468c95fe41f8Fariborz Jahanian } 4704921c14322977253a60dcb171f45e468c95fe41f8Fariborz Jahanian} 4705