SemaStmt.cpp revision 7dd900ed308506f9cf1cb72c70db1652f94cab37
15f016e2cb5d11daeb237544de1c5d59f20fe1a6eReid Spencer//===--- SemaStmt.cpp - Semantic Analysis for Statements ------------------===// 25f016e2cb5d11daeb237544de1c5d59f20fe1a6eReid Spencer// 35f016e2cb5d11daeb237544de1c5d59f20fe1a6eReid Spencer// The LLVM Compiler Infrastructure 45f016e2cb5d11daeb237544de1c5d59f20fe1a6eReid Spencer// 50bc735ffcfb223c0186419547abaa5c84482663eChris Lattner// This file is distributed under the University of Illinois Open Source 60bc735ffcfb223c0186419547abaa5c84482663eChris Lattner// License. See LICENSE.TXT for details. 75f016e2cb5d11daeb237544de1c5d59f20fe1a6eReid Spencer// 85f016e2cb5d11daeb237544de1c5d59f20fe1a6eReid Spencer//===----------------------------------------------------------------------===// 95f016e2cb5d11daeb237544de1c5d59f20fe1a6eReid Spencer// 105f016e2cb5d11daeb237544de1c5d59f20fe1a6eReid Spencer// This file implements semantic analysis for statements. 115f016e2cb5d11daeb237544de1c5d59f20fe1a6eReid Spencer// 125f016e2cb5d11daeb237544de1c5d59f20fe1a6eReid Spencer//===----------------------------------------------------------------------===// 135f016e2cb5d11daeb237544de1c5d59f20fe1a6eReid Spencer 142d88708cbe4e4ec5e04e4acb6bd7f5be68557379John McCall#include "clang/Sema/SemaInternal.h" 155f1e0942a32657b625702aa52f82430d0120f424John McCall#include "clang/Sema/Scope.h" 16781472fe99a120098c631b0cbe33c89f8cef5e70John McCall#include "clang/Sema/ScopeInfo.h" 17e737f5041a36d0befb39ffeed8d50ba15916d3daDouglas Gregor#include "clang/Sema/Initialization.h" 18ad762fcdc16b9e4705b12b09d92b8c026212b906Richard Smith#include "clang/Sema/Lookup.h" 19f4021e7d5228a2be5a380269dffa0331a6c78b95Chris Lattner#include "clang/AST/ASTContext.h" 201cd76e8ca8f890a4defadcae3372c025ebe7607cJohn McCall#include "clang/AST/CharUnits.h" 21c4a1dea2dc56bd1357ec91b829a0b9e68229a13eDaniel Dunbar#include "clang/AST/DeclObjC.h" 22694e796f462748ab4dc7ecdf4be5da44dd2c8c94Richard Trieu#include "clang/AST/EvaluatedExprVisitor.h" 2384fb9c0be621c9e4ca4e56f67dae2a0bb6e44821Douglas Gregor#include "clang/AST/ExprCXX.h" 24419cfb318cd69b6c717019288d5a3822be18d8f9Chris Lattner#include "clang/AST/ExprObjC.h" 2516f0049415ec596504891259e2a83e19871c0d52Chris Lattner#include "clang/AST/StmtObjC.h" 2616f0049415ec596504891259e2a83e19871c0d52Chris Lattner#include "clang/AST/StmtCXX.h" 27209acbd6d0c1b4444eb8c1682717753e1cbe38deJohn McCall#include "clang/AST/TypeLoc.h" 2884fb9c0be621c9e4ca4e56f67dae2a0bb6e44821Douglas Gregor#include "clang/Lex/Preprocessor.h" 296fa9086043b0338d895a4cdb0ec8542530af90d7Anders Carlsson#include "clang/Basic/TargetInfo.h" 30ca57b4b7658a031b74cda5ac504311998be8e343Chris Lattner#include "llvm/ADT/ArrayRef.h" 31c447aba04527a71d254b151f79f444d1cbe83ce9Sebastian Redl#include "llvm/ADT/STLExtras.h" 32694e796f462748ab4dc7ecdf4be5da44dd2c8c94Richard Trieu#include "llvm/ADT/SmallPtrSet.h" 3350de5e3247a20e0e548dc47022a011250e6e4e8fDouglas Gregor#include "llvm/ADT/SmallString.h" 34c447aba04527a71d254b151f79f444d1cbe83ce9Sebastian Redl#include "llvm/ADT/SmallVector.h" 355f016e2cb5d11daeb237544de1c5d59f20fe1a6eReid Spencerusing namespace clang; 36781472fe99a120098c631b0cbe33c89f8cef5e70John McCallusing namespace sema; 375f016e2cb5d11daeb237544de1c5d59f20fe1a6eReid Spencer 3860d7b3a319d84d688752be3870615ac0f111fb16John McCallStmtResult Sema::ActOnExprStmt(FullExprArg expr) { 399ae2f076ca5ab1feb3ba95629099ec2319833701John McCall Expr *E = expr.get(); 40bebbe0d9b7568ce43a464286bee49429489ef483Douglas Gregor if (!E) // FIXME: FullExprArg has no error state? 41bebbe0d9b7568ce43a464286bee49429489ef483Douglas Gregor return StmtError(); 42bebbe0d9b7568ce43a464286bee49429489ef483Douglas Gregor 43834a72ac74cf4ff07ba6215545dba3db578f8a07Chris Lattner // C99 6.8.3p2: The expression in an expression statement is evaluated as a 44834a72ac74cf4ff07ba6215545dba3db578f8a07Chris Lattner // void expression for its side effects. Conversion to void allows any 45834a72ac74cf4ff07ba6215545dba3db578f8a07Chris Lattner // operand, even incomplete types. 46a60528cdac7deee3991c2b48af4df4f315e49e9dSebastian Redl 47834a72ac74cf4ff07ba6215545dba3db578f8a07Chris Lattner // Same thing in for stmt first clause (when expr) and third clause. 48a60528cdac7deee3991c2b48af4df4f315e49e9dSebastian Redl return Owned(static_cast<Stmt*>(E)); 495f016e2cb5d11daeb237544de1c5d59f20fe1a6eReid Spencer} 505f016e2cb5d11daeb237544de1c5d59f20fe1a6eReid Spencer 515f016e2cb5d11daeb237544de1c5d59f20fe1a6eReid Spencer 52b7d98d35ea723624345f06e5895ddce2e0388ef0Argyrios KyrtzidisStmtResult Sema::ActOnNullStmt(SourceLocation SemiLoc, 53e2ca828119b8bff4a5c25c6db8ee4fec558451e7Argyrios Kyrtzidis bool HasLeadingEmptyMacro) { 54e2ca828119b8bff4a5c25c6db8ee4fec558451e7Argyrios Kyrtzidis return Owned(new (Context) NullStmt(SemiLoc, HasLeadingEmptyMacro)); 555f016e2cb5d11daeb237544de1c5d59f20fe1a6eReid Spencer} 565f016e2cb5d11daeb237544de1c5d59f20fe1a6eReid Spencer 57337e550218128e7d922c09bb354fbc71de90c568Chris LattnerStmtResult Sema::ActOnDeclStmt(DeclGroupPtrTy dg, SourceLocation StartLoc, 58337e550218128e7d922c09bb354fbc71de90c568Chris Lattner SourceLocation EndLoc) { 5920401698e3bd93a24bb5d9e18e435895cefe5fd1Chris Lattner DeclGroupRef DG = dg.getAsVal<DeclGroupRef>(); 601eb4433ac451dc16f4133a88af2d002ac26c58efMike Stump 61682bf92db408a6cbc3d37b5496a99b6ef85041ecChris Lattner // If we have an invalid decl, just return an error. 6220401698e3bd93a24bb5d9e18e435895cefe5fd1Chris Lattner if (DG.isNull()) return StmtError(); 631eb4433ac451dc16f4133a88af2d002ac26c58efMike Stump 6424e1e707b4c362f18e371e2bbf054a8345b57bfaChris Lattner return Owned(new (Context) DeclStmt(DG, StartLoc, EndLoc)); 655f016e2cb5d11daeb237544de1c5d59f20fe1a6eReid Spencer} 665f016e2cb5d11daeb237544de1c5d59f20fe1a6eReid Spencer 67a7cf23a72b0846fc5aacf3f38bb8c8f9e76784cfFariborz Jahanianvoid Sema::ActOnForEachDeclStmt(DeclGroupPtrTy dg) { 68a7cf23a72b0846fc5aacf3f38bb8c8f9e76784cfFariborz Jahanian DeclGroupRef DG = dg.getAsVal<DeclGroupRef>(); 69dfbb02a16ac8c764b5ba1742450513d6212d2f9fNAKAMURA Takumi 70a7cf23a72b0846fc5aacf3f38bb8c8f9e76784cfFariborz Jahanian // If we have an invalid decl, just return. 71a7cf23a72b0846fc5aacf3f38bb8c8f9e76784cfFariborz Jahanian if (DG.isNull() || !DG.isSingleDecl()) return; 72f85e193739c953358c865005855253af4f68a497John McCall VarDecl *var = cast<VarDecl>(DG.getSingleDecl()); 73f85e193739c953358c865005855253af4f68a497John McCall 74a7cf23a72b0846fc5aacf3f38bb8c8f9e76784cfFariborz Jahanian // suppress any potential 'unused variable' warning. 75f85e193739c953358c865005855253af4f68a497John McCall var->setUsed(); 76f85e193739c953358c865005855253af4f68a497John McCall 777acddacc921cd0b3f813443a8641eeddb82dfbd4John McCall // foreach variables are never actually initialized in the way that 787acddacc921cd0b3f813443a8641eeddb82dfbd4John McCall // the parser came up with. 797acddacc921cd0b3f813443a8641eeddb82dfbd4John McCall var->setInit(0); 807acddacc921cd0b3f813443a8641eeddb82dfbd4John McCall 817acddacc921cd0b3f813443a8641eeddb82dfbd4John McCall // In ARC, we don't need to retain the iteration variable of a fast 827acddacc921cd0b3f813443a8641eeddb82dfbd4John McCall // enumeration loop. Rather than actually trying to catch that 837acddacc921cd0b3f813443a8641eeddb82dfbd4John McCall // during declaration processing, we remove the consequences here. 844e4d08403ca5cfd4d558fa2936215d3a4e5a528dDavid Blaikie if (getLangOpts().ObjCAutoRefCount) { 857acddacc921cd0b3f813443a8641eeddb82dfbd4John McCall QualType type = var->getType(); 867acddacc921cd0b3f813443a8641eeddb82dfbd4John McCall 877acddacc921cd0b3f813443a8641eeddb82dfbd4John McCall // Only do this if we inferred the lifetime. Inferred lifetime 887acddacc921cd0b3f813443a8641eeddb82dfbd4John McCall // will show up as a local qualifier because explicit lifetime 897acddacc921cd0b3f813443a8641eeddb82dfbd4John McCall // should have shown up as an AttributedType instead. 907acddacc921cd0b3f813443a8641eeddb82dfbd4John McCall if (type.getLocalQualifiers().getObjCLifetime() == Qualifiers::OCL_Strong) { 917acddacc921cd0b3f813443a8641eeddb82dfbd4John McCall // Add 'const' and mark the variable as pseudo-strong. 927acddacc921cd0b3f813443a8641eeddb82dfbd4John McCall var->setType(type.withConst()); 937acddacc921cd0b3f813443a8641eeddb82dfbd4John McCall var->setARCPseudoStrong(true); 94f85e193739c953358c865005855253af4f68a497John McCall } 95f85e193739c953358c865005855253af4f68a497John McCall } 96a7cf23a72b0846fc5aacf3f38bb8c8f9e76784cfFariborz Jahanian} 97a7cf23a72b0846fc5aacf3f38bb8c8f9e76784cfFariborz Jahanian 98ec8058f64bbcd79bd47748f4cf8628123dd3bae6Chandler Carruth/// \brief Diagnose unused '==' and '!=' as likely typos for '=' or '|='. 999d8eb3b2a892697aed332f6c318a8554fc2623ceChandler Carruth/// 1009d8eb3b2a892697aed332f6c318a8554fc2623ceChandler Carruth/// Adding a cast to void (or other expression wrappers) will prevent the 1019d8eb3b2a892697aed332f6c318a8554fc2623ceChandler Carruth/// warning from firing. 102ec8058f64bbcd79bd47748f4cf8628123dd3bae6Chandler Carruthstatic bool DiagnoseUnusedComparison(Sema &S, const Expr *E) { 1039d8eb3b2a892697aed332f6c318a8554fc2623ceChandler Carruth SourceLocation Loc; 10450bf68fc9698742e36c311fc37e6e4b7de235c4bChandler Carruth bool IsNotEqual, CanAssign; 1059d8eb3b2a892697aed332f6c318a8554fc2623ceChandler Carruth 1069d8eb3b2a892697aed332f6c318a8554fc2623ceChandler Carruth if (const BinaryOperator *Op = dyn_cast<BinaryOperator>(E)) { 1079d8eb3b2a892697aed332f6c318a8554fc2623ceChandler Carruth if (Op->getOpcode() != BO_EQ && Op->getOpcode() != BO_NE) 108ec8058f64bbcd79bd47748f4cf8628123dd3bae6Chandler Carruth return false; 1099d8eb3b2a892697aed332f6c318a8554fc2623ceChandler Carruth 1109d8eb3b2a892697aed332f6c318a8554fc2623ceChandler Carruth Loc = Op->getOperatorLoc(); 11150bf68fc9698742e36c311fc37e6e4b7de235c4bChandler Carruth IsNotEqual = Op->getOpcode() == BO_NE; 11250bf68fc9698742e36c311fc37e6e4b7de235c4bChandler Carruth CanAssign = Op->getLHS()->IgnoreParenImpCasts()->isLValue(); 1139d8eb3b2a892697aed332f6c318a8554fc2623ceChandler Carruth } else if (const CXXOperatorCallExpr *Op = dyn_cast<CXXOperatorCallExpr>(E)) { 1149d8eb3b2a892697aed332f6c318a8554fc2623ceChandler Carruth if (Op->getOperator() != OO_EqualEqual && 1159d8eb3b2a892697aed332f6c318a8554fc2623ceChandler Carruth Op->getOperator() != OO_ExclaimEqual) 116ec8058f64bbcd79bd47748f4cf8628123dd3bae6Chandler Carruth return false; 1179d8eb3b2a892697aed332f6c318a8554fc2623ceChandler Carruth 1189d8eb3b2a892697aed332f6c318a8554fc2623ceChandler Carruth Loc = Op->getOperatorLoc(); 11950bf68fc9698742e36c311fc37e6e4b7de235c4bChandler Carruth IsNotEqual = Op->getOperator() == OO_ExclaimEqual; 12050bf68fc9698742e36c311fc37e6e4b7de235c4bChandler Carruth CanAssign = Op->getArg(0)->IgnoreParenImpCasts()->isLValue(); 1219d8eb3b2a892697aed332f6c318a8554fc2623ceChandler Carruth } else { 1229d8eb3b2a892697aed332f6c318a8554fc2623ceChandler Carruth // Not a typo-prone comparison. 123ec8058f64bbcd79bd47748f4cf8628123dd3bae6Chandler Carruth return false; 1249d8eb3b2a892697aed332f6c318a8554fc2623ceChandler Carruth } 1259d8eb3b2a892697aed332f6c318a8554fc2623ceChandler Carruth 1269d8eb3b2a892697aed332f6c318a8554fc2623ceChandler Carruth // Suppress warnings when the operator, suspicious as it may be, comes from 1279d8eb3b2a892697aed332f6c318a8554fc2623ceChandler Carruth // a macro expansion. 1289d8eb3b2a892697aed332f6c318a8554fc2623ceChandler Carruth if (Loc.isMacroID()) 129ec8058f64bbcd79bd47748f4cf8628123dd3bae6Chandler Carruth return false; 1309d8eb3b2a892697aed332f6c318a8554fc2623ceChandler Carruth 131ec8058f64bbcd79bd47748f4cf8628123dd3bae6Chandler Carruth S.Diag(Loc, diag::warn_unused_comparison) 1329d8eb3b2a892697aed332f6c318a8554fc2623ceChandler Carruth << (unsigned)IsNotEqual << E->getSourceRange(); 1339d8eb3b2a892697aed332f6c318a8554fc2623ceChandler Carruth 13450bf68fc9698742e36c311fc37e6e4b7de235c4bChandler Carruth // If the LHS is a plausible entity to assign to, provide a fixit hint to 13550bf68fc9698742e36c311fc37e6e4b7de235c4bChandler Carruth // correct common typos. 13650bf68fc9698742e36c311fc37e6e4b7de235c4bChandler Carruth if (CanAssign) { 13750bf68fc9698742e36c311fc37e6e4b7de235c4bChandler Carruth if (IsNotEqual) 13850bf68fc9698742e36c311fc37e6e4b7de235c4bChandler Carruth S.Diag(Loc, diag::note_inequality_comparison_to_or_assign) 13950bf68fc9698742e36c311fc37e6e4b7de235c4bChandler Carruth << FixItHint::CreateReplacement(Loc, "|="); 14050bf68fc9698742e36c311fc37e6e4b7de235c4bChandler Carruth else 14150bf68fc9698742e36c311fc37e6e4b7de235c4bChandler Carruth S.Diag(Loc, diag::note_equality_comparison_to_assign) 14250bf68fc9698742e36c311fc37e6e4b7de235c4bChandler Carruth << FixItHint::CreateReplacement(Loc, "="); 14350bf68fc9698742e36c311fc37e6e4b7de235c4bChandler Carruth } 144ec8058f64bbcd79bd47748f4cf8628123dd3bae6Chandler Carruth 145ec8058f64bbcd79bd47748f4cf8628123dd3bae6Chandler Carruth return true; 1469d8eb3b2a892697aed332f6c318a8554fc2623ceChandler Carruth} 1479d8eb3b2a892697aed332f6c318a8554fc2623ceChandler Carruth 148636463e4c43be15e2f0fd0b8a08667f3066d8af7Anders Carlssonvoid Sema::DiagnoseUnusedExprResult(const Stmt *S) { 149d2827af6f96d441d72315dbe6d8505c3be0f2aa6Argyrios Kyrtzidis if (const LabelStmt *Label = dyn_cast_or_null<LabelStmt>(S)) 150d2827af6f96d441d72315dbe6d8505c3be0f2aa6Argyrios Kyrtzidis return DiagnoseUnusedExprResult(Label->getSubStmt()); 151d2827af6f96d441d72315dbe6d8505c3be0f2aa6Argyrios Kyrtzidis 152754431107b61a0523df5271c2876a73dd5a051e9Anders Carlsson const Expr *E = dyn_cast_or_null<Expr>(S); 153636463e4c43be15e2f0fd0b8a08667f3066d8af7Anders Carlsson if (!E) 154636463e4c43be15e2f0fd0b8a08667f3066d8af7Anders Carlsson return; 155636463e4c43be15e2f0fd0b8a08667f3066d8af7Anders Carlsson 156a6115068cde719142eb394db88612c185cabd05bEli Friedman const Expr *WarnExpr; 157636463e4c43be15e2f0fd0b8a08667f3066d8af7Anders Carlsson SourceLocation Loc; 158636463e4c43be15e2f0fd0b8a08667f3066d8af7Anders Carlsson SourceRange R1, R2; 159d87a0cd2b3e1c9e9f01212875f4cbe5b7bb7ab57Matt Beaumont-Gay if (SourceMgr.isInSystemMacro(E->getExprLoc()) || 160a6115068cde719142eb394db88612c185cabd05bEli Friedman !E->isUnusedResultAWarning(WarnExpr, Loc, R1, R2, Context)) 161636463e4c43be15e2f0fd0b8a08667f3066d8af7Anders Carlsson return; 1621eb4433ac451dc16f4133a88af2d002ac26c58efMike Stump 163419cfb318cd69b6c717019288d5a3822be18d8f9Chris Lattner // Okay, we have an unused result. Depending on what the base expression is, 164419cfb318cd69b6c717019288d5a3822be18d8f9Chris Lattner // we might want to make a more specific diagnostic. Check for one of these 165419cfb318cd69b6c717019288d5a3822be18d8f9Chris Lattner // cases now. 166419cfb318cd69b6c717019288d5a3822be18d8f9Chris Lattner unsigned DiagID = diag::warn_unused_expr; 1674765fa05b5652fcc4356371c2f481d0ea9a1b007John McCall if (const ExprWithCleanups *Temps = dyn_cast<ExprWithCleanups>(E)) 1684dffad64c5c7106dc5ac506be94944299c8f7bc3Douglas Gregor E = Temps->getSubExpr(); 16934d49471e0b6386aefdc0f6bd15e4a4876ce5db1Chandler Carruth if (const CXXBindTemporaryExpr *TempExpr = dyn_cast<CXXBindTemporaryExpr>(E)) 17034d49471e0b6386aefdc0f6bd15e4a4876ce5db1Chandler Carruth E = TempExpr->getSubExpr(); 17112f78a6741a4cb3d904340f8d3d2714568b50e7aJohn McCall 172ec8058f64bbcd79bd47748f4cf8628123dd3bae6Chandler Carruth if (DiagnoseUnusedComparison(*this, E)) 173ec8058f64bbcd79bd47748f4cf8628123dd3bae6Chandler Carruth return; 174ec8058f64bbcd79bd47748f4cf8628123dd3bae6Chandler Carruth 175a6115068cde719142eb394db88612c185cabd05bEli Friedman E = WarnExpr; 176bc8d42c6f1565c0b2f93ad524edebfd7a4e6cac6Chris Lattner if (const CallExpr *CE = dyn_cast<CallExpr>(E)) { 1770faede6f31b07bcec7b776f2b420c3ea9bb3e58cJohn McCall if (E->getType()->isVoidType()) 1780faede6f31b07bcec7b776f2b420c3ea9bb3e58cJohn McCall return; 1790faede6f31b07bcec7b776f2b420c3ea9bb3e58cJohn McCall 180bc8d42c6f1565c0b2f93ad524edebfd7a4e6cac6Chris Lattner // If the callee has attribute pure, const, or warn_unused_result, warn with 181bc8d42c6f1565c0b2f93ad524edebfd7a4e6cac6Chris Lattner // a more specific message to make it clear what is happening. 182d20254f2875d0004c57ee766f258dbcee29f4841Nuno Lopes if (const Decl *FD = CE->getCalleeDecl()) { 183bc8d42c6f1565c0b2f93ad524edebfd7a4e6cac6Chris Lattner if (FD->getAttr<WarnUnusedResultAttr>()) { 18442d7b2d25b6f90dc397886d05502b10ab5a8b51bMatt Beaumont-Gay Diag(Loc, diag::warn_unused_result) << R1 << R2; 185bc8d42c6f1565c0b2f93ad524edebfd7a4e6cac6Chris Lattner return; 186bc8d42c6f1565c0b2f93ad524edebfd7a4e6cac6Chris Lattner } 187bc8d42c6f1565c0b2f93ad524edebfd7a4e6cac6Chris Lattner if (FD->getAttr<PureAttr>()) { 188bc8d42c6f1565c0b2f93ad524edebfd7a4e6cac6Chris Lattner Diag(Loc, diag::warn_unused_call) << R1 << R2 << "pure"; 189bc8d42c6f1565c0b2f93ad524edebfd7a4e6cac6Chris Lattner return; 190bc8d42c6f1565c0b2f93ad524edebfd7a4e6cac6Chris Lattner } 191bc8d42c6f1565c0b2f93ad524edebfd7a4e6cac6Chris Lattner if (FD->getAttr<ConstAttr>()) { 192bc8d42c6f1565c0b2f93ad524edebfd7a4e6cac6Chris Lattner Diag(Loc, diag::warn_unused_call) << R1 << R2 << "const"; 193bc8d42c6f1565c0b2f93ad524edebfd7a4e6cac6Chris Lattner return; 194bc8d42c6f1565c0b2f93ad524edebfd7a4e6cac6Chris Lattner } 195dfbb02a16ac8c764b5ba1742450513d6212d2f9fNAKAMURA Takumi } 19612f78a6741a4cb3d904340f8d3d2714568b50e7aJohn McCall } else if (const ObjCMessageExpr *ME = dyn_cast<ObjCMessageExpr>(E)) { 1974e4d08403ca5cfd4d558fa2936215d3a4e5a528dDavid Blaikie if (getLangOpts().ObjCAutoRefCount && ME->isDelegateInitCall()) { 198f85e193739c953358c865005855253af4f68a497John McCall Diag(Loc, diag::err_arc_unused_init_message) << R1; 199f85e193739c953358c865005855253af4f68a497John McCall return; 200f85e193739c953358c865005855253af4f68a497John McCall } 201f031774aa2638b4d3f487e7e44180c1f89b867efFariborz Jahanian const ObjCMethodDecl *MD = ME->getMethodDecl(); 202f031774aa2638b4d3f487e7e44180c1f89b867efFariborz Jahanian if (MD && MD->getAttr<WarnUnusedResultAttr>()) { 20342d7b2d25b6f90dc397886d05502b10ab5a8b51bMatt Beaumont-Gay Diag(Loc, diag::warn_unused_result) << R1 << R2; 204f031774aa2638b4d3f487e7e44180c1f89b867efFariborz Jahanian return; 205f031774aa2638b4d3f487e7e44180c1f89b867efFariborz Jahanian } 206ebcb57a8d298862c65043e88b2429591ab3c58d3Ted Kremenek } else if (const PseudoObjectExpr *POE = dyn_cast<PseudoObjectExpr>(E)) { 207ebcb57a8d298862c65043e88b2429591ab3c58d3Ted Kremenek const Expr *Source = POE->getSyntacticForm(); 208ebcb57a8d298862c65043e88b2429591ab3c58d3Ted Kremenek if (isa<ObjCSubscriptRefExpr>(Source)) 209ebcb57a8d298862c65043e88b2429591ab3c58d3Ted Kremenek DiagID = diag::warn_unused_container_subscript_expr; 210ebcb57a8d298862c65043e88b2429591ab3c58d3Ted Kremenek else 211ebcb57a8d298862c65043e88b2429591ab3c58d3Ted Kremenek DiagID = diag::warn_unused_property_expr; 212d6e44a3c4193bd422bfa78c8086fb16bb2168e34Douglas Gregor } else if (const CXXFunctionalCastExpr *FC 213d6e44a3c4193bd422bfa78c8086fb16bb2168e34Douglas Gregor = dyn_cast<CXXFunctionalCastExpr>(E)) { 214d6e44a3c4193bd422bfa78c8086fb16bb2168e34Douglas Gregor if (isa<CXXConstructExpr>(FC->getSubExpr()) || 215d6e44a3c4193bd422bfa78c8086fb16bb2168e34Douglas Gregor isa<CXXTemporaryObjectExpr>(FC->getSubExpr())) 216d6e44a3c4193bd422bfa78c8086fb16bb2168e34Douglas Gregor return; 217f031774aa2638b4d3f487e7e44180c1f89b867efFariborz Jahanian } 218209acbd6d0c1b4444eb8c1682717753e1cbe38deJohn McCall // Diagnose "(void*) blah" as a typo for "(void) blah". 219209acbd6d0c1b4444eb8c1682717753e1cbe38deJohn McCall else if (const CStyleCastExpr *CE = dyn_cast<CStyleCastExpr>(E)) { 220209acbd6d0c1b4444eb8c1682717753e1cbe38deJohn McCall TypeSourceInfo *TI = CE->getTypeInfoAsWritten(); 221209acbd6d0c1b4444eb8c1682717753e1cbe38deJohn McCall QualType T = TI->getType(); 222209acbd6d0c1b4444eb8c1682717753e1cbe38deJohn McCall 223209acbd6d0c1b4444eb8c1682717753e1cbe38deJohn McCall // We really do want to use the non-canonical type here. 224209acbd6d0c1b4444eb8c1682717753e1cbe38deJohn McCall if (T == Context.VoidPtrTy) { 225209acbd6d0c1b4444eb8c1682717753e1cbe38deJohn McCall PointerTypeLoc TL = cast<PointerTypeLoc>(TI->getTypeLoc()); 226209acbd6d0c1b4444eb8c1682717753e1cbe38deJohn McCall 227209acbd6d0c1b4444eb8c1682717753e1cbe38deJohn McCall Diag(Loc, diag::warn_unused_voidptr) 228209acbd6d0c1b4444eb8c1682717753e1cbe38deJohn McCall << FixItHint::CreateRemoval(TL.getStarLoc()); 229209acbd6d0c1b4444eb8c1682717753e1cbe38deJohn McCall return; 230209acbd6d0c1b4444eb8c1682717753e1cbe38deJohn McCall } 231209acbd6d0c1b4444eb8c1682717753e1cbe38deJohn McCall } 232209acbd6d0c1b4444eb8c1682717753e1cbe38deJohn McCall 233a6115068cde719142eb394db88612c185cabd05bEli Friedman if (E->isGLValue() && E->getType().isVolatileQualified()) { 234a6115068cde719142eb394db88612c185cabd05bEli Friedman Diag(Loc, diag::warn_unused_volatile) << R1 << R2; 235a6115068cde719142eb394db88612c185cabd05bEli Friedman return; 236a6115068cde719142eb394db88612c185cabd05bEli Friedman } 237a6115068cde719142eb394db88612c185cabd05bEli Friedman 238351ba91eaa6d30e523587b2d7ed676a5172c6e56Ted Kremenek DiagRuntimeBehavior(Loc, 0, PDiag(DiagID) << R1 << R2); 239636463e4c43be15e2f0fd0b8a08667f3066d8af7Anders Carlsson} 240636463e4c43be15e2f0fd0b8a08667f3066d8af7Anders Carlsson 241625bb569df0c34feec0d52c0ec5215f21ef2e054Dmitri Gribenkovoid Sema::ActOnStartOfCompoundStmt() { 242625bb569df0c34feec0d52c0ec5215f21ef2e054Dmitri Gribenko PushCompoundScope(); 243625bb569df0c34feec0d52c0ec5215f21ef2e054Dmitri Gribenko} 244625bb569df0c34feec0d52c0ec5215f21ef2e054Dmitri Gribenko 245625bb569df0c34feec0d52c0ec5215f21ef2e054Dmitri Gribenkovoid Sema::ActOnFinishOfCompoundStmt() { 246625bb569df0c34feec0d52c0ec5215f21ef2e054Dmitri Gribenko PopCompoundScope(); 247625bb569df0c34feec0d52c0ec5215f21ef2e054Dmitri Gribenko} 248625bb569df0c34feec0d52c0ec5215f21ef2e054Dmitri Gribenko 249625bb569df0c34feec0d52c0ec5215f21ef2e054Dmitri Gribenkosema::CompoundScopeInfo &Sema::getCurCompoundScope() const { 250625bb569df0c34feec0d52c0ec5215f21ef2e054Dmitri Gribenko return getCurFunction()->CompoundScopes.back(); 251625bb569df0c34feec0d52c0ec5215f21ef2e054Dmitri Gribenko} 252625bb569df0c34feec0d52c0ec5215f21ef2e054Dmitri Gribenko 25360d7b3a319d84d688752be3870615ac0f111fb16John McCallStmtResult 2541b273c403734d343d720acb28f04011807c8aa56Steve NaroffSema::ActOnCompoundStmt(SourceLocation L, SourceLocation R, 255a60528cdac7deee3991c2b48af4df4f315e49e9dSebastian Redl MultiStmtArg elts, bool isStmtExpr) { 256a60528cdac7deee3991c2b48af4df4f315e49e9dSebastian Redl unsigned NumElts = elts.size(); 257a60528cdac7deee3991c2b48af4df4f315e49e9dSebastian Redl Stmt **Elts = reinterpret_cast<Stmt**>(elts.release()); 258c30ebfbf23d6a471146e3c68c2cf7f170b7e55dcChris Lattner // If we're in C89 mode, check that we don't have any decls after stmts. If 259c30ebfbf23d6a471146e3c68c2cf7f170b7e55dcChris Lattner // so, emit an extension diagnostic. 2604e4d08403ca5cfd4d558fa2936215d3a4e5a528dDavid Blaikie if (!getLangOpts().C99 && !getLangOpts().CPlusPlus) { 261c30ebfbf23d6a471146e3c68c2cf7f170b7e55dcChris Lattner // Note that __extension__ can be around a decl. 262c30ebfbf23d6a471146e3c68c2cf7f170b7e55dcChris Lattner unsigned i = 0; 263c30ebfbf23d6a471146e3c68c2cf7f170b7e55dcChris Lattner // Skip over all declarations. 264c30ebfbf23d6a471146e3c68c2cf7f170b7e55dcChris Lattner for (; i != NumElts && isa<DeclStmt>(Elts[i]); ++i) 265c30ebfbf23d6a471146e3c68c2cf7f170b7e55dcChris Lattner /*empty*/; 266c30ebfbf23d6a471146e3c68c2cf7f170b7e55dcChris Lattner 267c30ebfbf23d6a471146e3c68c2cf7f170b7e55dcChris Lattner // We found the end of the list or a statement. Scan for another declstmt. 268c30ebfbf23d6a471146e3c68c2cf7f170b7e55dcChris Lattner for (; i != NumElts && !isa<DeclStmt>(Elts[i]); ++i) 269c30ebfbf23d6a471146e3c68c2cf7f170b7e55dcChris Lattner /*empty*/; 2701eb4433ac451dc16f4133a88af2d002ac26c58efMike Stump 271c30ebfbf23d6a471146e3c68c2cf7f170b7e55dcChris Lattner if (i != NumElts) { 2724afa39deaa245592977136d367251ee2c173dd8dDouglas Gregor Decl *D = *cast<DeclStmt>(Elts[i])->decl_begin(); 273c30ebfbf23d6a471146e3c68c2cf7f170b7e55dcChris Lattner Diag(D->getLocation(), diag::ext_mixed_decls_code); 274c30ebfbf23d6a471146e3c68c2cf7f170b7e55dcChris Lattner } 275c30ebfbf23d6a471146e3c68c2cf7f170b7e55dcChris Lattner } 27698414c1b7d1944a57156d52e29bd41c005de09acChris Lattner // Warn about unused expressions in statements. 27798414c1b7d1944a57156d52e29bd41c005de09acChris Lattner for (unsigned i = 0; i != NumElts; ++i) { 278636463e4c43be15e2f0fd0b8a08667f3066d8af7Anders Carlsson // Ignore statements that are last in a statement expression. 279636463e4c43be15e2f0fd0b8a08667f3066d8af7Anders Carlsson if (isStmtExpr && i == NumElts - 1) 28098414c1b7d1944a57156d52e29bd41c005de09acChris Lattner continue; 2811eb4433ac451dc16f4133a88af2d002ac26c58efMike Stump 282636463e4c43be15e2f0fd0b8a08667f3066d8af7Anders Carlsson DiagnoseUnusedExprResult(Elts[i]); 28398414c1b7d1944a57156d52e29bd41c005de09acChris Lattner } 284a60528cdac7deee3991c2b48af4df4f315e49e9dSebastian Redl 285625bb569df0c34feec0d52c0ec5215f21ef2e054Dmitri Gribenko // Check for suspicious empty body (null statement) in `for' and `while' 286625bb569df0c34feec0d52c0ec5215f21ef2e054Dmitri Gribenko // statements. Don't do anything for template instantiations, this just adds 287625bb569df0c34feec0d52c0ec5215f21ef2e054Dmitri Gribenko // noise. 288625bb569df0c34feec0d52c0ec5215f21ef2e054Dmitri Gribenko if (NumElts != 0 && !CurrentInstantiationScope && 289625bb569df0c34feec0d52c0ec5215f21ef2e054Dmitri Gribenko getCurCompoundScope().HasEmptyLoopBodies) { 290625bb569df0c34feec0d52c0ec5215f21ef2e054Dmitri Gribenko for (unsigned i = 0; i != NumElts - 1; ++i) 291625bb569df0c34feec0d52c0ec5215f21ef2e054Dmitri Gribenko DiagnoseEmptyLoopBody(Elts[i], Elts[i + 1]); 292625bb569df0c34feec0d52c0ec5215f21ef2e054Dmitri Gribenko } 293625bb569df0c34feec0d52c0ec5215f21ef2e054Dmitri Gribenko 2948189cde56b4f6f938cd65f53c932fe1860d0204cTed Kremenek return Owned(new (Context) CompoundStmt(Context, Elts, NumElts, L, R)); 2955f016e2cb5d11daeb237544de1c5d59f20fe1a6eReid Spencer} 2965f016e2cb5d11daeb237544de1c5d59f20fe1a6eReid Spencer 29760d7b3a319d84d688752be3870615ac0f111fb16John McCallStmtResult 2989ae2f076ca5ab1feb3ba95629099ec2319833701John McCallSema::ActOnCaseStmt(SourceLocation CaseLoc, Expr *LHSVal, 2999ae2f076ca5ab1feb3ba95629099ec2319833701John McCall SourceLocation DotDotDotLoc, Expr *RHSVal, 30024e1e707b4c362f18e371e2bbf054a8345b57bfaChris Lattner SourceLocation ColonLoc) { 3019ae2f076ca5ab1feb3ba95629099ec2319833701John McCall assert((LHSVal != 0) && "missing expression in case statement"); 302117054a99f4994e4ec8a1fc904b554e1f2dc9b29Sebastian Redl 3038ef7b203332b0c8d65876a1f5e6d1db4e6f40e4bRichard Smith if (getCurFunction()->SwitchStack.empty()) { 3048ef7b203332b0c8d65876a1f5e6d1db4e6f40e4bRichard Smith Diag(CaseLoc, diag::err_case_not_in_switch); 30524e1e707b4c362f18e371e2bbf054a8345b57bfaChris Lattner return StmtError(); 3068ef7b203332b0c8d65876a1f5e6d1db4e6f40e4bRichard Smith } 3075f016e2cb5d11daeb237544de1c5d59f20fe1a6eReid Spencer 3084e4d08403ca5cfd4d558fa2936215d3a4e5a528dDavid Blaikie if (!getLangOpts().CPlusPlus0x) { 3098ef7b203332b0c8d65876a1f5e6d1db4e6f40e4bRichard Smith // C99 6.8.4.2p3: The expression shall be an integer constant. 3108ef7b203332b0c8d65876a1f5e6d1db4e6f40e4bRichard Smith // However, GCC allows any evaluatable integer expression. 311282e7e66748cc6dd14d6f7f2cb52e5373c531e61Richard Smith if (!LHSVal->isTypeDependent() && !LHSVal->isValueDependent()) { 312282e7e66748cc6dd14d6f7f2cb52e5373c531e61Richard Smith LHSVal = VerifyIntegerConstantExpression(LHSVal).take(); 313282e7e66748cc6dd14d6f7f2cb52e5373c531e61Richard Smith if (!LHSVal) 314282e7e66748cc6dd14d6f7f2cb52e5373c531e61Richard Smith return StmtError(); 315282e7e66748cc6dd14d6f7f2cb52e5373c531e61Richard Smith } 316117054a99f4994e4ec8a1fc904b554e1f2dc9b29Sebastian Redl 3178ef7b203332b0c8d65876a1f5e6d1db4e6f40e4bRichard Smith // GCC extension: The expression shall be an integer constant. 318117054a99f4994e4ec8a1fc904b554e1f2dc9b29Sebastian Redl 319282e7e66748cc6dd14d6f7f2cb52e5373c531e61Richard Smith if (RHSVal && !RHSVal->isTypeDependent() && !RHSVal->isValueDependent()) { 320282e7e66748cc6dd14d6f7f2cb52e5373c531e61Richard Smith RHSVal = VerifyIntegerConstantExpression(RHSVal).take(); 321282e7e66748cc6dd14d6f7f2cb52e5373c531e61Richard Smith // Recover from an error by just forgetting about it. 3228ef7b203332b0c8d65876a1f5e6d1db4e6f40e4bRichard Smith } 3238a87e57beb96212ee61dc08a5f691cd7f7710703Chris Lattner } 3245f016e2cb5d11daeb237544de1c5d59f20fe1a6eReid Spencer 325dbb26db1d426fb6caaaf1b4fa47b46d1947c12c9Douglas Gregor CaseStmt *CS = new (Context) CaseStmt(LHSVal, RHSVal, CaseLoc, DotDotDotLoc, 326dbb26db1d426fb6caaaf1b4fa47b46d1947c12c9Douglas Gregor ColonLoc); 327781472fe99a120098c631b0cbe33c89f8cef5e70John McCall getCurFunction()->SwitchStack.back()->addSwitchCase(CS); 328117054a99f4994e4ec8a1fc904b554e1f2dc9b29Sebastian Redl return Owned(CS); 3295f016e2cb5d11daeb237544de1c5d59f20fe1a6eReid Spencer} 3305f016e2cb5d11daeb237544de1c5d59f20fe1a6eReid Spencer 33124e1e707b4c362f18e371e2bbf054a8345b57bfaChris Lattner/// ActOnCaseStmtBody - This installs a statement as the body of a case. 3329ae2f076ca5ab1feb3ba95629099ec2319833701John McCallvoid Sema::ActOnCaseStmtBody(Stmt *caseStmt, Stmt *SubStmt) { 3335440bfaff6aec058b60bc6da75bb4f13b7a76491Chandler Carruth DiagnoseUnusedExprResult(SubStmt); 3345440bfaff6aec058b60bc6da75bb4f13b7a76491Chandler Carruth 33524e1e707b4c362f18e371e2bbf054a8345b57bfaChris Lattner CaseStmt *CS = static_cast<CaseStmt*>(caseStmt); 33624e1e707b4c362f18e371e2bbf054a8345b57bfaChris Lattner CS->setSubStmt(SubStmt); 33724e1e707b4c362f18e371e2bbf054a8345b57bfaChris Lattner} 33824e1e707b4c362f18e371e2bbf054a8345b57bfaChris Lattner 33960d7b3a319d84d688752be3870615ac0f111fb16John McCallStmtResult 3401eb4433ac451dc16f4133a88af2d002ac26c58efMike StumpSema::ActOnDefaultStmt(SourceLocation DefaultLoc, SourceLocation ColonLoc, 3419ae2f076ca5ab1feb3ba95629099ec2319833701John McCall Stmt *SubStmt, Scope *CurScope) { 3425440bfaff6aec058b60bc6da75bb4f13b7a76491Chandler Carruth DiagnoseUnusedExprResult(SubStmt); 3435440bfaff6aec058b60bc6da75bb4f13b7a76491Chandler Carruth 344781472fe99a120098c631b0cbe33c89f8cef5e70John McCall if (getCurFunction()->SwitchStack.empty()) { 3450fa152e72bb71c4aa184d0edd91caa9cbebbf70eChris Lattner Diag(DefaultLoc, diag::err_default_not_in_switch); 346117054a99f4994e4ec8a1fc904b554e1f2dc9b29Sebastian Redl return Owned(SubStmt); 3470fa152e72bb71c4aa184d0edd91caa9cbebbf70eChris Lattner } 348117054a99f4994e4ec8a1fc904b554e1f2dc9b29Sebastian Redl 349dbb26db1d426fb6caaaf1b4fa47b46d1947c12c9Douglas Gregor DefaultStmt *DS = new (Context) DefaultStmt(DefaultLoc, ColonLoc, SubStmt); 350781472fe99a120098c631b0cbe33c89f8cef5e70John McCall getCurFunction()->SwitchStack.back()->addSwitchCase(DS); 351117054a99f4994e4ec8a1fc904b554e1f2dc9b29Sebastian Redl return Owned(DS); 3525f016e2cb5d11daeb237544de1c5d59f20fe1a6eReid Spencer} 3535f016e2cb5d11daeb237544de1c5d59f20fe1a6eReid Spencer 35460d7b3a319d84d688752be3870615ac0f111fb16John McCallStmtResult 35557ad37823e198f977cac605dbfbaefb4daf325e9Chris LattnerSema::ActOnLabelStmt(SourceLocation IdentLoc, LabelDecl *TheDecl, 35657ad37823e198f977cac605dbfbaefb4daf325e9Chris Lattner SourceLocation ColonLoc, Stmt *SubStmt) { 357ad8dcf4a9df0e24051dc31bf9e6f3cd138a34298Chris Lattner // If the label was multiply defined, reject it now. 358ad8dcf4a9df0e24051dc31bf9e6f3cd138a34298Chris Lattner if (TheDecl->getStmt()) { 359ad8dcf4a9df0e24051dc31bf9e6f3cd138a34298Chris Lattner Diag(IdentLoc, diag::err_redefinition_of_label) << TheDecl->getDeclName(); 360ad8dcf4a9df0e24051dc31bf9e6f3cd138a34298Chris Lattner Diag(TheDecl->getLocation(), diag::note_previous_definition); 361de307473448fb3cebcb4c10090728300b53bca03Sebastian Redl return Owned(SubStmt); 3625f016e2cb5d11daeb237544de1c5d59f20fe1a6eReid Spencer } 363de307473448fb3cebcb4c10090728300b53bca03Sebastian Redl 364ad8dcf4a9df0e24051dc31bf9e6f3cd138a34298Chris Lattner // Otherwise, things are good. Fill in the declaration and return it. 365ad8dcf4a9df0e24051dc31bf9e6f3cd138a34298Chris Lattner LabelStmt *LS = new (Context) LabelStmt(IdentLoc, TheDecl, SubStmt); 366ad8dcf4a9df0e24051dc31bf9e6f3cd138a34298Chris Lattner TheDecl->setStmt(LS); 367203548ba4b72e7e59320d352afc1eb0b5ab131deAbramo Bagnara if (!TheDecl->isGnuLocal()) 368203548ba4b72e7e59320d352afc1eb0b5ab131deAbramo Bagnara TheDecl->setLocation(IdentLoc); 369ad8dcf4a9df0e24051dc31bf9e6f3cd138a34298Chris Lattner return Owned(LS); 3705f016e2cb5d11daeb237544de1c5d59f20fe1a6eReid Spencer} 3715f016e2cb5d11daeb237544de1c5d59f20fe1a6eReid Spencer 372534986f2b21e6050bf00163cd6423fd92155a6edRichard SmithStmtResult Sema::ActOnAttributedStmt(SourceLocation AttrLoc, 373534986f2b21e6050bf00163cd6423fd92155a6edRichard Smith const AttrVec &Attrs, 374534986f2b21e6050bf00163cd6423fd92155a6edRichard Smith Stmt *SubStmt) { 375534986f2b21e6050bf00163cd6423fd92155a6edRichard Smith // Fill in the declaration and return it. Variable length will require to 376534986f2b21e6050bf00163cd6423fd92155a6edRichard Smith // change this to AttributedStmt::Create(Context, ....); 377534986f2b21e6050bf00163cd6423fd92155a6edRichard Smith // and probably using ArrayRef 378534986f2b21e6050bf00163cd6423fd92155a6edRichard Smith AttributedStmt *LS = new (Context) AttributedStmt(AttrLoc, Attrs, SubStmt); 379534986f2b21e6050bf00163cd6423fd92155a6edRichard Smith return Owned(LS); 380534986f2b21e6050bf00163cd6423fd92155a6edRichard Smith} 381534986f2b21e6050bf00163cd6423fd92155a6edRichard Smith 38260d7b3a319d84d688752be3870615ac0f111fb16John McCallStmtResult 383d226f65006733ed7f709c3174f22ce33391cb58fJohn McCallSema::ActOnIfStmt(SourceLocation IfLoc, FullExprArg CondVal, Decl *CondVar, 38444aa1f397855f130e88e62ffc1029f7f83bb5d2eArgyrios Kyrtzidis Stmt *thenStmt, SourceLocation ElseLoc, 38544aa1f397855f130e88e62ffc1029f7f83bb5d2eArgyrios Kyrtzidis Stmt *elseStmt) { 38660d7b3a319d84d688752be3870615ac0f111fb16John McCall ExprResult CondResult(CondVal.release()); 3871eb4433ac451dc16f4133a88af2d002ac26c58efMike Stump 3888cfe5a784133d90bf329fd20801824a6f71bb8caDouglas Gregor VarDecl *ConditionVar = 0; 389d226f65006733ed7f709c3174f22ce33391cb58fJohn McCall if (CondVar) { 390d226f65006733ed7f709c3174f22ce33391cb58fJohn McCall ConditionVar = cast<VarDecl>(CondVar); 391586596fd7f7a336a2847b300c80614dcf39ab6d5Douglas Gregor CondResult = CheckConditionVariable(ConditionVar, IfLoc, true); 39299e9b4d172f6877e6ba5ebe75bb8238721f5e01cDouglas Gregor if (CondResult.isInvalid()) 39399e9b4d172f6877e6ba5ebe75bb8238721f5e01cDouglas Gregor return StmtError(); 3948cfe5a784133d90bf329fd20801824a6f71bb8caDouglas Gregor } 39599e9b4d172f6877e6ba5ebe75bb8238721f5e01cDouglas Gregor Expr *ConditionExpr = CondResult.takeAs<Expr>(); 39699e9b4d172f6877e6ba5ebe75bb8238721f5e01cDouglas Gregor if (!ConditionExpr) 39799e9b4d172f6877e6ba5ebe75bb8238721f5e01cDouglas Gregor return StmtError(); 398dfbb02a16ac8c764b5ba1742450513d6212d2f9fNAKAMURA Takumi 399754431107b61a0523df5271c2876a73dd5a051e9Anders Carlsson DiagnoseUnusedExprResult(thenStmt); 4005f016e2cb5d11daeb237544de1c5d59f20fe1a6eReid Spencer 4019ae2f076ca5ab1feb3ba95629099ec2319833701John McCall if (!elseStmt) { 402625bb569df0c34feec0d52c0ec5215f21ef2e054Dmitri Gribenko DiagnoseEmptyStmtBody(ConditionExpr->getLocEnd(), thenStmt, 403625bb569df0c34feec0d52c0ec5215f21ef2e054Dmitri Gribenko diag::warn_empty_if_body); 4042d85f8ba62fd6fdcf0ae303d77112b413d412caeAnders Carlsson } 4052d85f8ba62fd6fdcf0ae303d77112b413d412caeAnders Carlsson 406754431107b61a0523df5271c2876a73dd5a051e9Anders Carlsson DiagnoseUnusedExprResult(elseStmt); 4071eb4433ac451dc16f4133a88af2d002ac26c58efMike Stump 408dfbb02a16ac8c764b5ba1742450513d6212d2f9fNAKAMURA Takumi return Owned(new (Context) IfStmt(Context, IfLoc, ConditionVar, ConditionExpr, 40944aa1f397855f130e88e62ffc1029f7f83bb5d2eArgyrios Kyrtzidis thenStmt, ElseLoc, elseStmt)); 4105f016e2cb5d11daeb237544de1c5d59f20fe1a6eReid Spencer} 4115f016e2cb5d11daeb237544de1c5d59f20fe1a6eReid Spencer 412f4021e7d5228a2be5a380269dffa0331a6c78b95Chris Lattner/// ConvertIntegerToTypeWarnOnOverflow - Convert the specified APInt to have 413f4021e7d5228a2be5a380269dffa0331a6c78b95Chris Lattner/// the specified width and sign. If an overflow occurs, detect it and emit 414f4021e7d5228a2be5a380269dffa0331a6c78b95Chris Lattner/// the specified diagnostic. 415f4021e7d5228a2be5a380269dffa0331a6c78b95Chris Lattnervoid Sema::ConvertIntegerToTypeWarnOnOverflow(llvm::APSInt &Val, 416f4021e7d5228a2be5a380269dffa0331a6c78b95Chris Lattner unsigned NewWidth, bool NewSign, 4171eb4433ac451dc16f4133a88af2d002ac26c58efMike Stump SourceLocation Loc, 418f4021e7d5228a2be5a380269dffa0331a6c78b95Chris Lattner unsigned DiagID) { 419f4021e7d5228a2be5a380269dffa0331a6c78b95Chris Lattner // Perform a conversion to the promoted condition type if needed. 420f4021e7d5228a2be5a380269dffa0331a6c78b95Chris Lattner if (NewWidth > Val.getBitWidth()) { 421f4021e7d5228a2be5a380269dffa0331a6c78b95Chris Lattner // If this is an extension, just do it. 4229f71a8f4c7a182a5236da9e747d57cc1d1bd24c2Jay Foad Val = Val.extend(NewWidth); 423f4021e7d5228a2be5a380269dffa0331a6c78b95Chris Lattner Val.setIsSigned(NewSign); 424f9f627dbbc62fbf51b906c24c783b4249dc7e9bbDouglas Gregor 425f9f627dbbc62fbf51b906c24c783b4249dc7e9bbDouglas Gregor // If the input was signed and negative and the output is 426f9f627dbbc62fbf51b906c24c783b4249dc7e9bbDouglas Gregor // unsigned, don't bother to warn: this is implementation-defined 427f9f627dbbc62fbf51b906c24c783b4249dc7e9bbDouglas Gregor // behavior. 428f9f627dbbc62fbf51b906c24c783b4249dc7e9bbDouglas Gregor // FIXME: Introduce a second, default-ignored warning for this case? 429f4021e7d5228a2be5a380269dffa0331a6c78b95Chris Lattner } else if (NewWidth < Val.getBitWidth()) { 430f4021e7d5228a2be5a380269dffa0331a6c78b95Chris Lattner // If this is a truncation, check for overflow. 431f4021e7d5228a2be5a380269dffa0331a6c78b95Chris Lattner llvm::APSInt ConvVal(Val); 4329f71a8f4c7a182a5236da9e747d57cc1d1bd24c2Jay Foad ConvVal = ConvVal.trunc(NewWidth); 433b2137ae3f1bd0aadb0552189af2824a324ffaa69Chris Lattner ConvVal.setIsSigned(NewSign); 4349f71a8f4c7a182a5236da9e747d57cc1d1bd24c2Jay Foad ConvVal = ConvVal.extend(Val.getBitWidth()); 435b2137ae3f1bd0aadb0552189af2824a324ffaa69Chris Lattner ConvVal.setIsSigned(Val.isSigned()); 436f4021e7d5228a2be5a380269dffa0331a6c78b95Chris Lattner if (ConvVal != Val) 437d3a94e24ddf3fb90de76b17bd176d9ed61e66f2cChris Lattner Diag(Loc, DiagID) << Val.toString(10) << ConvVal.toString(10); 4381eb4433ac451dc16f4133a88af2d002ac26c58efMike Stump 439f4021e7d5228a2be5a380269dffa0331a6c78b95Chris Lattner // Regardless of whether a diagnostic was emitted, really do the 440f4021e7d5228a2be5a380269dffa0331a6c78b95Chris Lattner // truncation. 4419f71a8f4c7a182a5236da9e747d57cc1d1bd24c2Jay Foad Val = Val.trunc(NewWidth); 442b2137ae3f1bd0aadb0552189af2824a324ffaa69Chris Lattner Val.setIsSigned(NewSign); 443f4021e7d5228a2be5a380269dffa0331a6c78b95Chris Lattner } else if (NewSign != Val.isSigned()) { 444f4021e7d5228a2be5a380269dffa0331a6c78b95Chris Lattner // Convert the sign to match the sign of the condition. This can cause 445f4021e7d5228a2be5a380269dffa0331a6c78b95Chris Lattner // overflow as well: unsigned(INTMIN) 446dfbb02a16ac8c764b5ba1742450513d6212d2f9fNAKAMURA Takumi // We don't diagnose this overflow, because it is implementation-defined 4472853eac24e2e70a74d7da817653b0528b976039fDouglas Gregor // behavior. 4482853eac24e2e70a74d7da817653b0528b976039fDouglas Gregor // FIXME: Introduce a second, default-ignored warning for this case? 449f4021e7d5228a2be5a380269dffa0331a6c78b95Chris Lattner llvm::APSInt OldVal(Val); 450f4021e7d5228a2be5a380269dffa0331a6c78b95Chris Lattner Val.setIsSigned(NewSign); 451f4021e7d5228a2be5a380269dffa0331a6c78b95Chris Lattner } 452f4021e7d5228a2be5a380269dffa0331a6c78b95Chris Lattner} 453f4021e7d5228a2be5a380269dffa0331a6c78b95Chris Lattner 4540471f5bc8191e39cdb61fabcaf1870e2af2d42e8Chris Lattnernamespace { 4550471f5bc8191e39cdb61fabcaf1870e2af2d42e8Chris Lattner struct CaseCompareFunctor { 4560471f5bc8191e39cdb61fabcaf1870e2af2d42e8Chris Lattner bool operator()(const std::pair<llvm::APSInt, CaseStmt*> &LHS, 4570471f5bc8191e39cdb61fabcaf1870e2af2d42e8Chris Lattner const llvm::APSInt &RHS) { 4580471f5bc8191e39cdb61fabcaf1870e2af2d42e8Chris Lattner return LHS.first < RHS; 4590471f5bc8191e39cdb61fabcaf1870e2af2d42e8Chris Lattner } 4600e85a2761ace912c66663d779dd230f88cf77fe0Chris Lattner bool operator()(const std::pair<llvm::APSInt, CaseStmt*> &LHS, 4610e85a2761ace912c66663d779dd230f88cf77fe0Chris Lattner const std::pair<llvm::APSInt, CaseStmt*> &RHS) { 4620e85a2761ace912c66663d779dd230f88cf77fe0Chris Lattner return LHS.first < RHS.first; 4630e85a2761ace912c66663d779dd230f88cf77fe0Chris Lattner } 4640471f5bc8191e39cdb61fabcaf1870e2af2d42e8Chris Lattner bool operator()(const llvm::APSInt &LHS, 4650471f5bc8191e39cdb61fabcaf1870e2af2d42e8Chris Lattner const std::pair<llvm::APSInt, CaseStmt*> &RHS) { 4660471f5bc8191e39cdb61fabcaf1870e2af2d42e8Chris Lattner return LHS < RHS.first; 4670471f5bc8191e39cdb61fabcaf1870e2af2d42e8Chris Lattner } 4680471f5bc8191e39cdb61fabcaf1870e2af2d42e8Chris Lattner }; 4690471f5bc8191e39cdb61fabcaf1870e2af2d42e8Chris Lattner} 4700471f5bc8191e39cdb61fabcaf1870e2af2d42e8Chris Lattner 471764a7ce5217f9569e100a3445f47496ee82daf86Chris Lattner/// CmpCaseVals - Comparison predicate for sorting case values. 472764a7ce5217f9569e100a3445f47496ee82daf86Chris Lattner/// 473764a7ce5217f9569e100a3445f47496ee82daf86Chris Lattnerstatic bool CmpCaseVals(const std::pair<llvm::APSInt, CaseStmt*>& lhs, 474764a7ce5217f9569e100a3445f47496ee82daf86Chris Lattner const std::pair<llvm::APSInt, CaseStmt*>& rhs) { 475764a7ce5217f9569e100a3445f47496ee82daf86Chris Lattner if (lhs.first < rhs.first) 476764a7ce5217f9569e100a3445f47496ee82daf86Chris Lattner return true; 477764a7ce5217f9569e100a3445f47496ee82daf86Chris Lattner 478764a7ce5217f9569e100a3445f47496ee82daf86Chris Lattner if (lhs.first == rhs.first && 479764a7ce5217f9569e100a3445f47496ee82daf86Chris Lattner lhs.second->getCaseLoc().getRawEncoding() 480764a7ce5217f9569e100a3445f47496ee82daf86Chris Lattner < rhs.second->getCaseLoc().getRawEncoding()) 481764a7ce5217f9569e100a3445f47496ee82daf86Chris Lattner return true; 482764a7ce5217f9569e100a3445f47496ee82daf86Chris Lattner return false; 483764a7ce5217f9569e100a3445f47496ee82daf86Chris Lattner} 484764a7ce5217f9569e100a3445f47496ee82daf86Chris Lattner 485ba915af51ced751c46e7c2b9c6f3b59d2e668825Douglas Gregor/// CmpEnumVals - Comparison predicate for sorting enumeration values. 486ba915af51ced751c46e7c2b9c6f3b59d2e668825Douglas Gregor/// 487ba915af51ced751c46e7c2b9c6f3b59d2e668825Douglas Gregorstatic bool CmpEnumVals(const std::pair<llvm::APSInt, EnumConstantDecl*>& lhs, 488ba915af51ced751c46e7c2b9c6f3b59d2e668825Douglas Gregor const std::pair<llvm::APSInt, EnumConstantDecl*>& rhs) 489ba915af51ced751c46e7c2b9c6f3b59d2e668825Douglas Gregor{ 490ba915af51ced751c46e7c2b9c6f3b59d2e668825Douglas Gregor return lhs.first < rhs.first; 491ba915af51ced751c46e7c2b9c6f3b59d2e668825Douglas Gregor} 492ba915af51ced751c46e7c2b9c6f3b59d2e668825Douglas Gregor 493ba915af51ced751c46e7c2b9c6f3b59d2e668825Douglas Gregor/// EqEnumVals - Comparison preficate for uniqing enumeration values. 494ba915af51ced751c46e7c2b9c6f3b59d2e668825Douglas Gregor/// 495ba915af51ced751c46e7c2b9c6f3b59d2e668825Douglas Gregorstatic bool EqEnumVals(const std::pair<llvm::APSInt, EnumConstantDecl*>& lhs, 496ba915af51ced751c46e7c2b9c6f3b59d2e668825Douglas Gregor const std::pair<llvm::APSInt, EnumConstantDecl*>& rhs) 497ba915af51ced751c46e7c2b9c6f3b59d2e668825Douglas Gregor{ 498ba915af51ced751c46e7c2b9c6f3b59d2e668825Douglas Gregor return lhs.first == rhs.first; 499ba915af51ced751c46e7c2b9c6f3b59d2e668825Douglas Gregor} 500ba915af51ced751c46e7c2b9c6f3b59d2e668825Douglas Gregor 5015f04881eb025f61396d0555d8173730fe2759e0aChris Lattner/// GetTypeBeforeIntegralPromotion - Returns the pre-promotion type of 5025f04881eb025f61396d0555d8173730fe2759e0aChris Lattner/// potentially integral-promoted expression @p expr. 503a8e0cd8cdecc7e0ba1792e46773b884c6eed4829John McCallstatic QualType GetTypeBeforeIntegralPromotion(Expr *&expr) { 504a8e0cd8cdecc7e0ba1792e46773b884c6eed4829John McCall if (ExprWithCleanups *cleanups = dyn_cast<ExprWithCleanups>(expr)) 505a8e0cd8cdecc7e0ba1792e46773b884c6eed4829John McCall expr = cleanups->getSubExpr(); 506a8e0cd8cdecc7e0ba1792e46773b884c6eed4829John McCall while (ImplicitCastExpr *impcast = dyn_cast<ImplicitCastExpr>(expr)) { 507a8e0cd8cdecc7e0ba1792e46773b884c6eed4829John McCall if (impcast->getCastKind() != CK_IntegralCast) break; 508a8e0cd8cdecc7e0ba1792e46773b884c6eed4829John McCall expr = impcast->getSubExpr(); 5095f04881eb025f61396d0555d8173730fe2759e0aChris Lattner } 5105f04881eb025f61396d0555d8173730fe2759e0aChris Lattner return expr->getType(); 5115f04881eb025f61396d0555d8173730fe2759e0aChris Lattner} 5125f04881eb025f61396d0555d8173730fe2759e0aChris Lattner 51360d7b3a319d84d688752be3870615ac0f111fb16John McCallStmtResult 514dfbb02a16ac8c764b5ba1742450513d6212d2f9fNAKAMURA TakumiSema::ActOnStartOfSwitchStmt(SourceLocation SwitchLoc, Expr *Cond, 515d226f65006733ed7f709c3174f22ce33391cb58fJohn McCall Decl *CondVar) { 51660d7b3a319d84d688752be3870615ac0f111fb16John McCall ExprResult CondResult; 5179ae2f076ca5ab1feb3ba95629099ec2319833701John McCall 518586596fd7f7a336a2847b300c80614dcf39ab6d5Douglas Gregor VarDecl *ConditionVar = 0; 519d226f65006733ed7f709c3174f22ce33391cb58fJohn McCall if (CondVar) { 520d226f65006733ed7f709c3174f22ce33391cb58fJohn McCall ConditionVar = cast<VarDecl>(CondVar); 5219ae2f076ca5ab1feb3ba95629099ec2319833701John McCall CondResult = CheckConditionVariable(ConditionVar, SourceLocation(), false); 5229ae2f076ca5ab1feb3ba95629099ec2319833701John McCall if (CondResult.isInvalid()) 523586596fd7f7a336a2847b300c80614dcf39ab6d5Douglas Gregor return StmtError(); 524dfbb02a16ac8c764b5ba1742450513d6212d2f9fNAKAMURA Takumi 5259ae2f076ca5ab1feb3ba95629099ec2319833701John McCall Cond = CondResult.release(); 526586596fd7f7a336a2847b300c80614dcf39ab6d5Douglas Gregor } 527dfbb02a16ac8c764b5ba1742450513d6212d2f9fNAKAMURA Takumi 5289ae2f076ca5ab1feb3ba95629099ec2319833701John McCall if (!Cond) 529586596fd7f7a336a2847b300c80614dcf39ab6d5Douglas Gregor return StmtError(); 530dfbb02a16ac8c764b5ba1742450513d6212d2f9fNAKAMURA Takumi 531ab41fe914f63bb470dfa7e400876ada72f57a931Douglas Gregor class SwitchConvertDiagnoser : public ICEConvertDiagnoser { 532ab41fe914f63bb470dfa7e400876ada72f57a931Douglas Gregor Expr *Cond; 5338e1e0543cc3b63e0bc116bae0d2f1e8fc530b436Chad Rosier 534ab41fe914f63bb470dfa7e400876ada72f57a931Douglas Gregor public: 535ab41fe914f63bb470dfa7e400876ada72f57a931Douglas Gregor SwitchConvertDiagnoser(Expr *Cond) 536ab41fe914f63bb470dfa7e400876ada72f57a931Douglas Gregor : ICEConvertDiagnoser(false, true), Cond(Cond) { } 5378e1e0543cc3b63e0bc116bae0d2f1e8fc530b436Chad Rosier 538ab41fe914f63bb470dfa7e400876ada72f57a931Douglas Gregor virtual DiagnosticBuilder diagnoseNotInt(Sema &S, SourceLocation Loc, 539ab41fe914f63bb470dfa7e400876ada72f57a931Douglas Gregor QualType T) { 540ab41fe914f63bb470dfa7e400876ada72f57a931Douglas Gregor return S.Diag(Loc, diag::err_typecheck_statement_requires_integer) << T; 541ab41fe914f63bb470dfa7e400876ada72f57a931Douglas Gregor } 5428e1e0543cc3b63e0bc116bae0d2f1e8fc530b436Chad Rosier 543ab41fe914f63bb470dfa7e400876ada72f57a931Douglas Gregor virtual DiagnosticBuilder diagnoseIncomplete(Sema &S, SourceLocation Loc, 544ab41fe914f63bb470dfa7e400876ada72f57a931Douglas Gregor QualType T) { 545ab41fe914f63bb470dfa7e400876ada72f57a931Douglas Gregor return S.Diag(Loc, diag::err_switch_incomplete_class_type) 546ab41fe914f63bb470dfa7e400876ada72f57a931Douglas Gregor << T << Cond->getSourceRange(); 547ab41fe914f63bb470dfa7e400876ada72f57a931Douglas Gregor } 5488e1e0543cc3b63e0bc116bae0d2f1e8fc530b436Chad Rosier 549ab41fe914f63bb470dfa7e400876ada72f57a931Douglas Gregor virtual DiagnosticBuilder diagnoseExplicitConv(Sema &S, SourceLocation Loc, 550ab41fe914f63bb470dfa7e400876ada72f57a931Douglas Gregor QualType T, 551ab41fe914f63bb470dfa7e400876ada72f57a931Douglas Gregor QualType ConvTy) { 552ab41fe914f63bb470dfa7e400876ada72f57a931Douglas Gregor return S.Diag(Loc, diag::err_switch_explicit_conversion) << T << ConvTy; 553ab41fe914f63bb470dfa7e400876ada72f57a931Douglas Gregor } 5548e1e0543cc3b63e0bc116bae0d2f1e8fc530b436Chad Rosier 555ab41fe914f63bb470dfa7e400876ada72f57a931Douglas Gregor virtual DiagnosticBuilder noteExplicitConv(Sema &S, CXXConversionDecl *Conv, 556ab41fe914f63bb470dfa7e400876ada72f57a931Douglas Gregor QualType ConvTy) { 557ab41fe914f63bb470dfa7e400876ada72f57a931Douglas Gregor return S.Diag(Conv->getLocation(), diag::note_switch_conversion) 558ab41fe914f63bb470dfa7e400876ada72f57a931Douglas Gregor << ConvTy->isEnumeralType() << ConvTy; 559ab41fe914f63bb470dfa7e400876ada72f57a931Douglas Gregor } 5608e1e0543cc3b63e0bc116bae0d2f1e8fc530b436Chad Rosier 561ab41fe914f63bb470dfa7e400876ada72f57a931Douglas Gregor virtual DiagnosticBuilder diagnoseAmbiguous(Sema &S, SourceLocation Loc, 562ab41fe914f63bb470dfa7e400876ada72f57a931Douglas Gregor QualType T) { 563ab41fe914f63bb470dfa7e400876ada72f57a931Douglas Gregor return S.Diag(Loc, diag::err_switch_multiple_conversions) << T; 564ab41fe914f63bb470dfa7e400876ada72f57a931Douglas Gregor } 5658e1e0543cc3b63e0bc116bae0d2f1e8fc530b436Chad Rosier 566ab41fe914f63bb470dfa7e400876ada72f57a931Douglas Gregor virtual DiagnosticBuilder noteAmbiguous(Sema &S, CXXConversionDecl *Conv, 567ab41fe914f63bb470dfa7e400876ada72f57a931Douglas Gregor QualType ConvTy) { 568ab41fe914f63bb470dfa7e400876ada72f57a931Douglas Gregor return S.Diag(Conv->getLocation(), diag::note_switch_conversion) 569ab41fe914f63bb470dfa7e400876ada72f57a931Douglas Gregor << ConvTy->isEnumeralType() << ConvTy; 570ab41fe914f63bb470dfa7e400876ada72f57a931Douglas Gregor } 5718e1e0543cc3b63e0bc116bae0d2f1e8fc530b436Chad Rosier 572ab41fe914f63bb470dfa7e400876ada72f57a931Douglas Gregor virtual DiagnosticBuilder diagnoseConversion(Sema &S, SourceLocation Loc, 573ab41fe914f63bb470dfa7e400876ada72f57a931Douglas Gregor QualType T, 574ab41fe914f63bb470dfa7e400876ada72f57a931Douglas Gregor QualType ConvTy) { 575ab41fe914f63bb470dfa7e400876ada72f57a931Douglas Gregor return DiagnosticBuilder::getEmpty(); 576ab41fe914f63bb470dfa7e400876ada72f57a931Douglas Gregor } 577ab41fe914f63bb470dfa7e400876ada72f57a931Douglas Gregor } SwitchDiagnoser(Cond); 578ab41fe914f63bb470dfa7e400876ada72f57a931Douglas Gregor 5799ae2f076ca5ab1feb3ba95629099ec2319833701John McCall CondResult 580ab41fe914f63bb470dfa7e400876ada72f57a931Douglas Gregor = ConvertToIntegralOrEnumerationType(SwitchLoc, Cond, SwitchDiagnoser, 581f39aec17b89f8f0dd78e78c50ad2fa08f12272e3Richard Smith /*AllowScopedEnumerations*/ true); 5829ae2f076ca5ab1feb3ba95629099ec2319833701John McCall if (CondResult.isInvalid()) return StmtError(); 5839ae2f076ca5ab1feb3ba95629099ec2319833701John McCall Cond = CondResult.take(); 584dfbb02a16ac8c764b5ba1742450513d6212d2f9fNAKAMURA Takumi 585a8e0cd8cdecc7e0ba1792e46773b884c6eed4829John McCall // C99 6.8.4.2p5 - Integer promotions are performed on the controlling expr. 586a8e0cd8cdecc7e0ba1792e46773b884c6eed4829John McCall CondResult = UsualUnaryConversions(Cond); 587a8e0cd8cdecc7e0ba1792e46773b884c6eed4829John McCall if (CondResult.isInvalid()) return StmtError(); 588a8e0cd8cdecc7e0ba1792e46773b884c6eed4829John McCall Cond = CondResult.take(); 589a8e0cd8cdecc7e0ba1792e46773b884c6eed4829John McCall 590d226f65006733ed7f709c3174f22ce33391cb58fJohn McCall if (!CondVar) { 591b4eb64d8426c0eaa58d398961e0e74ff85063d7cJohn McCall CheckImplicitConversions(Cond, SwitchLoc); 5924765fa05b5652fcc4356371c2f481d0ea9a1b007John McCall CondResult = MaybeCreateExprWithCleanups(Cond); 5939ae2f076ca5ab1feb3ba95629099ec2319833701John McCall if (CondResult.isInvalid()) 594586596fd7f7a336a2847b300c80614dcf39ab6d5Douglas Gregor return StmtError(); 5959ae2f076ca5ab1feb3ba95629099ec2319833701John McCall Cond = CondResult.take(); 596586596fd7f7a336a2847b300c80614dcf39ab6d5Douglas Gregor } 597b60a77e453d32db0ab1914d28e175c2defc0eb65John McCall 598781472fe99a120098c631b0cbe33c89f8cef5e70John McCall getCurFunction()->setHasBranchIntoScope(); 599dfbb02a16ac8c764b5ba1742450513d6212d2f9fNAKAMURA Takumi 6009ae2f076ca5ab1feb3ba95629099ec2319833701John McCall SwitchStmt *SS = new (Context) SwitchStmt(Context, ConditionVar, Cond); 601781472fe99a120098c631b0cbe33c89f8cef5e70John McCall getCurFunction()->SwitchStack.push_back(SS); 602586596fd7f7a336a2847b300c80614dcf39ab6d5Douglas Gregor return Owned(SS); 6037e52de4b45286d057b367bb1f9283a1e32d79252Chris Lattner} 6047e52de4b45286d057b367bb1f9283a1e32d79252Chris Lattner 60528164ab2ac1deea68cdb989f941728bf1860ce41Gabor Greifstatic void AdjustAPSInt(llvm::APSInt &Val, unsigned BitWidth, bool IsSigned) { 60628164ab2ac1deea68cdb989f941728bf1860ce41Gabor Greif if (Val.getBitWidth() < BitWidth) 6079f71a8f4c7a182a5236da9e747d57cc1d1bd24c2Jay Foad Val = Val.extend(BitWidth); 60828164ab2ac1deea68cdb989f941728bf1860ce41Gabor Greif else if (Val.getBitWidth() > BitWidth) 6099f71a8f4c7a182a5236da9e747d57cc1d1bd24c2Jay Foad Val = Val.trunc(BitWidth); 61028164ab2ac1deea68cdb989f941728bf1860ce41Gabor Greif Val.setIsSigned(IsSigned); 61128164ab2ac1deea68cdb989f941728bf1860ce41Gabor Greif} 61228164ab2ac1deea68cdb989f941728bf1860ce41Gabor Greif 61360d7b3a319d84d688752be3870615ac0f111fb16John McCallStmtResult 6149ae2f076ca5ab1feb3ba95629099ec2319833701John McCallSema::ActOnFinishSwitchStmt(SourceLocation SwitchLoc, Stmt *Switch, 6159ae2f076ca5ab1feb3ba95629099ec2319833701John McCall Stmt *BodyStmt) { 6169ae2f076ca5ab1feb3ba95629099ec2319833701John McCall SwitchStmt *SS = cast<SwitchStmt>(Switch); 617781472fe99a120098c631b0cbe33c89f8cef5e70John McCall assert(SS == getCurFunction()->SwitchStack.back() && 618781472fe99a120098c631b0cbe33c89f8cef5e70John McCall "switch stack missing push/pop!"); 619de307473448fb3cebcb4c10090728300b53bca03Sebastian Redl 6209dcbfa450d751bd68fc4af8b75da381d4f6984b9Steve Naroff SS->setBody(BodyStmt, SwitchLoc); 621781472fe99a120098c631b0cbe33c89f8cef5e70John McCall getCurFunction()->SwitchStack.pop_back(); 622c1fcb7762673be706b0a40477d5e93411e918f93Anders Carlsson 623f4021e7d5228a2be5a380269dffa0331a6c78b95Chris Lattner Expr *CondExpr = SS->getCond(); 624a8e0cd8cdecc7e0ba1792e46773b884c6eed4829John McCall if (!CondExpr) return StmtError(); 625de307473448fb3cebcb4c10090728300b53bca03Sebastian Redl 626a0d3ca1ea5578bc736bb71bcec50ab41fefc87b9Douglas Gregor QualType CondType = CondExpr->getType(); 627a8e0cd8cdecc7e0ba1792e46773b884c6eed4829John McCall 628a8e0cd8cdecc7e0ba1792e46773b884c6eed4829John McCall Expr *CondExprBeforePromotion = CondExpr; 629a8e0cd8cdecc7e0ba1792e46773b884c6eed4829John McCall QualType CondTypeBeforePromotion = 630a8e0cd8cdecc7e0ba1792e46773b884c6eed4829John McCall GetTypeBeforeIntegralPromotion(CondExprBeforePromotion); 63184fb9c0be621c9e4ca4e56f67dae2a0bb6e44821Douglas Gregor 6325f04881eb025f61396d0555d8173730fe2759e0aChris Lattner // C++ 6.4.2.p2: 6335f04881eb025f61396d0555d8173730fe2759e0aChris Lattner // Integral promotions are performed (on the switch condition). 6345f04881eb025f61396d0555d8173730fe2759e0aChris Lattner // 6355f04881eb025f61396d0555d8173730fe2759e0aChris Lattner // A case value unrepresentable by the original switch condition 6365f04881eb025f61396d0555d8173730fe2759e0aChris Lattner // type (before the promotion) doesn't make sense, even when it can 6375f04881eb025f61396d0555d8173730fe2759e0aChris Lattner // be represented by the promoted type. Therefore we need to find 6385f04881eb025f61396d0555d8173730fe2759e0aChris Lattner // the pre-promotion type of the switch condition. 63912356b119032edd64e9c32f9f01920d12c2acc57Edward O'Callaghan if (!CondExpr->isTypeDependent()) { 640acb0bd85d30ecacbe872ca9d9cfac5d7b6038a43Douglas Gregor // We have already converted the expression to an integral or enumeration 641dfbb02a16ac8c764b5ba1742450513d6212d2f9fNAKAMURA Takumi // type, when we started the switch statement. If we don't have an 642acb0bd85d30ecacbe872ca9d9cfac5d7b6038a43Douglas Gregor // appropriate type now, just return an error. 643acb0bd85d30ecacbe872ca9d9cfac5d7b6038a43Douglas Gregor if (!CondType->isIntegralOrEnumerationType()) 64412356b119032edd64e9c32f9f01920d12c2acc57Edward O'Callaghan return StmtError(); 64512356b119032edd64e9c32f9f01920d12c2acc57Edward O'Callaghan 6462b334bb3126a67895813e49e6228dad4aec0b4d6Chris Lattner if (CondExpr->isKnownToHaveBooleanValue()) { 64712356b119032edd64e9c32f9f01920d12c2acc57Edward O'Callaghan // switch(bool_expr) {...} is often a programmer error, e.g. 64812356b119032edd64e9c32f9f01920d12c2acc57Edward O'Callaghan // switch(n && mask) { ... } // Doh - should be "n & mask". 64912356b119032edd64e9c32f9f01920d12c2acc57Edward O'Callaghan // One can always use an if statement instead of switch(bool_expr). 65012356b119032edd64e9c32f9f01920d12c2acc57Edward O'Callaghan Diag(SwitchLoc, diag::warn_bool_switch_condition) 65112356b119032edd64e9c32f9f01920d12c2acc57Edward O'Callaghan << CondExpr->getSourceRange(); 65212356b119032edd64e9c32f9f01920d12c2acc57Edward O'Callaghan } 653c1fcb7762673be706b0a40477d5e93411e918f93Anders Carlsson } 654de307473448fb3cebcb4c10090728300b53bca03Sebastian Redl 655f4021e7d5228a2be5a380269dffa0331a6c78b95Chris Lattner // Get the bitwidth of the switched-on value before promotions. We must 656f4021e7d5228a2be5a380269dffa0331a6c78b95Chris Lattner // convert the integer case values to this width before comparison. 6571eb4433ac451dc16f4133a88af2d002ac26c58efMike Stump bool HasDependentValue 658dbb26db1d426fb6caaaf1b4fa47b46d1947c12c9Douglas Gregor = CondExpr->isTypeDependent() || CondExpr->isValueDependent(); 6591eb4433ac451dc16f4133a88af2d002ac26c58efMike Stump unsigned CondWidth 6601d6ab7af99a1fc059a6aa5da083640c1d94b07f7Chris Lattner = HasDependentValue ? 0 : Context.getIntWidth(CondTypeBeforePromotion); 661575a1c9dc8dc5b4977194993e289f9eda7295c39Douglas Gregor bool CondIsSigned 662575a1c9dc8dc5b4977194993e289f9eda7295c39Douglas Gregor = CondTypeBeforePromotion->isSignedIntegerOrEnumerationType(); 6631eb4433ac451dc16f4133a88af2d002ac26c58efMike Stump 664f4021e7d5228a2be5a380269dffa0331a6c78b95Chris Lattner // Accumulate all of the case values in a vector so that we can sort them 665f4021e7d5228a2be5a380269dffa0331a6c78b95Chris Lattner // and detect duplicates. This vector contains the APInt for the case after 666f4021e7d5228a2be5a380269dffa0331a6c78b95Chris Lattner // it has been converted to the condition type. 6675f9e272e632e951b1efe824cd16acb4d96077930Chris Lattner typedef SmallVector<std::pair<llvm::APSInt, CaseStmt*>, 64> CaseValsTy; 6680471f5bc8191e39cdb61fabcaf1870e2af2d42e8Chris Lattner CaseValsTy CaseVals; 6691eb4433ac451dc16f4133a88af2d002ac26c58efMike Stump 670f4021e7d5228a2be5a380269dffa0331a6c78b95Chris Lattner // Keep track of any GNU case ranges we see. The APSInt is the low value. 671ba915af51ced751c46e7c2b9c6f3b59d2e668825Douglas Gregor typedef std::vector<std::pair<llvm::APSInt, CaseStmt*> > CaseRangesTy; 672ba915af51ced751c46e7c2b9c6f3b59d2e668825Douglas Gregor CaseRangesTy CaseRanges; 6731eb4433ac451dc16f4133a88af2d002ac26c58efMike Stump 674f4021e7d5228a2be5a380269dffa0331a6c78b95Chris Lattner DefaultStmt *TheDefaultStmt = 0; 6751eb4433ac451dc16f4133a88af2d002ac26c58efMike Stump 676b2ec9d6fede9cccc170a202de7bf7f523dea8be4Chris Lattner bool CaseListIsErroneous = false; 6771eb4433ac451dc16f4133a88af2d002ac26c58efMike Stump 678dbb26db1d426fb6caaaf1b4fa47b46d1947c12c9Douglas Gregor for (SwitchCase *SC = SS->getSwitchCaseList(); SC && !HasDependentValue; 679c1fcb7762673be706b0a40477d5e93411e918f93Anders Carlsson SC = SC->getNextSwitchCase()) { 6801eb4433ac451dc16f4133a88af2d002ac26c58efMike Stump 681c1fcb7762673be706b0a40477d5e93411e918f93Anders Carlsson if (DefaultStmt *DS = dyn_cast<DefaultStmt>(SC)) { 682f4021e7d5228a2be5a380269dffa0331a6c78b95Chris Lattner if (TheDefaultStmt) { 683f4021e7d5228a2be5a380269dffa0331a6c78b95Chris Lattner Diag(DS->getDefaultLoc(), diag::err_multiple_default_labels_defined); 6845f4a6829dc58cab2f76e2b98492859aa3b91e3f2Chris Lattner Diag(TheDefaultStmt->getDefaultLoc(), diag::note_duplicate_case_prev); 685de307473448fb3cebcb4c10090728300b53bca03Sebastian Redl 686f4021e7d5228a2be5a380269dffa0331a6c78b95Chris Lattner // FIXME: Remove the default statement from the switch block so that 687390b4cc8b45a05612349269ef08faab3e4688f06Mike Stump // we'll return a valid AST. This requires recursing down the AST and 688390b4cc8b45a05612349269ef08faab3e4688f06Mike Stump // finding it, not something we are set up to do right now. For now, 689390b4cc8b45a05612349269ef08faab3e4688f06Mike Stump // just lop the entire switch stmt out of the AST. 690b2ec9d6fede9cccc170a202de7bf7f523dea8be4Chris Lattner CaseListIsErroneous = true; 691c1fcb7762673be706b0a40477d5e93411e918f93Anders Carlsson } 692f4021e7d5228a2be5a380269dffa0331a6c78b95Chris Lattner TheDefaultStmt = DS; 6931eb4433ac451dc16f4133a88af2d002ac26c58efMike Stump 694f4021e7d5228a2be5a380269dffa0331a6c78b95Chris Lattner } else { 695f4021e7d5228a2be5a380269dffa0331a6c78b95Chris Lattner CaseStmt *CS = cast<CaseStmt>(SC); 6961eb4433ac451dc16f4133a88af2d002ac26c58efMike Stump 6971e0a39012467b4f409142c32148036a9ee05e1d7Chris Lattner Expr *Lo = CS->getLHS(); 698dbb26db1d426fb6caaaf1b4fa47b46d1947c12c9Douglas Gregor 699dbb26db1d426fb6caaaf1b4fa47b46d1947c12c9Douglas Gregor if (Lo->isTypeDependent() || Lo->isValueDependent()) { 700dbb26db1d426fb6caaaf1b4fa47b46d1947c12c9Douglas Gregor HasDependentValue = true; 701dbb26db1d426fb6caaaf1b4fa47b46d1947c12c9Douglas Gregor break; 702dbb26db1d426fb6caaaf1b4fa47b46d1947c12c9Douglas Gregor } 7031eb4433ac451dc16f4133a88af2d002ac26c58efMike Stump 7048ef7b203332b0c8d65876a1f5e6d1db4e6f40e4bRichard Smith llvm::APSInt LoVal; 7051eb4433ac451dc16f4133a88af2d002ac26c58efMike Stump 7064e4d08403ca5cfd4d558fa2936215d3a4e5a528dDavid Blaikie if (getLangOpts().CPlusPlus0x) { 7078ef7b203332b0c8d65876a1f5e6d1db4e6f40e4bRichard Smith // C++11 [stmt.switch]p2: the constant-expression shall be a converted 7088ef7b203332b0c8d65876a1f5e6d1db4e6f40e4bRichard Smith // constant expression of the promoted type of the switch condition. 7098ef7b203332b0c8d65876a1f5e6d1db4e6f40e4bRichard Smith ExprResult ConvLo = 7108ef7b203332b0c8d65876a1f5e6d1db4e6f40e4bRichard Smith CheckConvertedConstantExpression(Lo, CondType, LoVal, CCEK_CaseValue); 7118ef7b203332b0c8d65876a1f5e6d1db4e6f40e4bRichard Smith if (ConvLo.isInvalid()) { 7128ef7b203332b0c8d65876a1f5e6d1db4e6f40e4bRichard Smith CaseListIsErroneous = true; 7138ef7b203332b0c8d65876a1f5e6d1db4e6f40e4bRichard Smith continue; 7148ef7b203332b0c8d65876a1f5e6d1db4e6f40e4bRichard Smith } 7158ef7b203332b0c8d65876a1f5e6d1db4e6f40e4bRichard Smith Lo = ConvLo.take(); 7168ef7b203332b0c8d65876a1f5e6d1db4e6f40e4bRichard Smith } else { 7178ef7b203332b0c8d65876a1f5e6d1db4e6f40e4bRichard Smith // We already verified that the expression has a i-c-e value (C99 7188ef7b203332b0c8d65876a1f5e6d1db4e6f40e4bRichard Smith // 6.8.4.2p3) - get that value now. 7198ef7b203332b0c8d65876a1f5e6d1db4e6f40e4bRichard Smith LoVal = Lo->EvaluateKnownConstInt(Context); 7208ef7b203332b0c8d65876a1f5e6d1db4e6f40e4bRichard Smith 7218ef7b203332b0c8d65876a1f5e6d1db4e6f40e4bRichard Smith // If the LHS is not the same type as the condition, insert an implicit 7228ef7b203332b0c8d65876a1f5e6d1db4e6f40e4bRichard Smith // cast. 7238ef7b203332b0c8d65876a1f5e6d1db4e6f40e4bRichard Smith Lo = DefaultLvalueConversion(Lo).take(); 7248ef7b203332b0c8d65876a1f5e6d1db4e6f40e4bRichard Smith Lo = ImpCastExprToType(Lo, CondType, CK_IntegralCast).take(); 7258ef7b203332b0c8d65876a1f5e6d1db4e6f40e4bRichard Smith } 7268ef7b203332b0c8d65876a1f5e6d1db4e6f40e4bRichard Smith 7278ef7b203332b0c8d65876a1f5e6d1db4e6f40e4bRichard Smith // Convert the value to the same width/sign as the condition had prior to 7288ef7b203332b0c8d65876a1f5e6d1db4e6f40e4bRichard Smith // integral promotions. 7298ef7b203332b0c8d65876a1f5e6d1db4e6f40e4bRichard Smith // 7308ef7b203332b0c8d65876a1f5e6d1db4e6f40e4bRichard Smith // FIXME: This causes us to reject valid code: 7318ef7b203332b0c8d65876a1f5e6d1db4e6f40e4bRichard Smith // switch ((char)c) { case 256: case 0: return 0; } 7328ef7b203332b0c8d65876a1f5e6d1db4e6f40e4bRichard Smith // Here we claim there is a duplicated condition value, but there is not. 733f4021e7d5228a2be5a380269dffa0331a6c78b95Chris Lattner ConvertIntegerToTypeWarnOnOverflow(LoVal, CondWidth, CondIsSigned, 73428164ab2ac1deea68cdb989f941728bf1860ce41Gabor Greif Lo->getLocStart(), 735f4021e7d5228a2be5a380269dffa0331a6c78b95Chris Lattner diag::warn_case_value_overflow); 7366c36be5b383875b490684bcf439d6d427298c1afChris Lattner 7371e0a39012467b4f409142c32148036a9ee05e1d7Chris Lattner CS->setLHS(Lo); 7381eb4433ac451dc16f4133a88af2d002ac26c58efMike Stump 739b2ec9d6fede9cccc170a202de7bf7f523dea8be4Chris Lattner // If this is a case range, remember it in CaseRanges, otherwise CaseVals. 740dbb26db1d426fb6caaaf1b4fa47b46d1947c12c9Douglas Gregor if (CS->getRHS()) { 7411eb4433ac451dc16f4133a88af2d002ac26c58efMike Stump if (CS->getRHS()->isTypeDependent() || 742dbb26db1d426fb6caaaf1b4fa47b46d1947c12c9Douglas Gregor CS->getRHS()->isValueDependent()) { 743dbb26db1d426fb6caaaf1b4fa47b46d1947c12c9Douglas Gregor HasDependentValue = true; 744dbb26db1d426fb6caaaf1b4fa47b46d1947c12c9Douglas Gregor break; 745dbb26db1d426fb6caaaf1b4fa47b46d1947c12c9Douglas Gregor } 746f4021e7d5228a2be5a380269dffa0331a6c78b95Chris Lattner CaseRanges.push_back(std::make_pair(LoVal, CS)); 7471eb4433ac451dc16f4133a88af2d002ac26c58efMike Stump } else 748b2ec9d6fede9cccc170a202de7bf7f523dea8be4Chris Lattner CaseVals.push_back(std::make_pair(LoVal, CS)); 749f4021e7d5228a2be5a380269dffa0331a6c78b95Chris Lattner } 750f4021e7d5228a2be5a380269dffa0331a6c78b95Chris Lattner } 751b2ec9d6fede9cccc170a202de7bf7f523dea8be4Chris Lattner 752dbb26db1d426fb6caaaf1b4fa47b46d1947c12c9Douglas Gregor if (!HasDependentValue) { 7530fb97083cc0f8a82e404e22991ae80d2216e71d5John McCall // If we don't have a default statement, check whether the 7540fb97083cc0f8a82e404e22991ae80d2216e71d5John McCall // condition is constant. 7550fb97083cc0f8a82e404e22991ae80d2216e71d5John McCall llvm::APSInt ConstantCondValue; 7560fb97083cc0f8a82e404e22991ae80d2216e71d5John McCall bool HasConstantCond = false; 7570fb97083cc0f8a82e404e22991ae80d2216e71d5John McCall if (!HasDependentValue && !TheDefaultStmt) { 75851f4708c00110940ca3f337961915f2ca1668375Richard Smith HasConstantCond 75980d4b55db94db2172a04617d1a80feca6bbcea5cRichard Smith = CondExprBeforePromotion->EvaluateAsInt(ConstantCondValue, Context, 76080d4b55db94db2172a04617d1a80feca6bbcea5cRichard Smith Expr::SE_AllowSideEffects); 76180d4b55db94db2172a04617d1a80feca6bbcea5cRichard Smith assert(!HasConstantCond || 76280d4b55db94db2172a04617d1a80feca6bbcea5cRichard Smith (ConstantCondValue.getBitWidth() == CondWidth && 76380d4b55db94db2172a04617d1a80feca6bbcea5cRichard Smith ConstantCondValue.isSigned() == CondIsSigned)); 7640fb97083cc0f8a82e404e22991ae80d2216e71d5John McCall } 76580d4b55db94db2172a04617d1a80feca6bbcea5cRichard Smith bool ShouldCheckConstantCond = HasConstantCond; 7660fb97083cc0f8a82e404e22991ae80d2216e71d5John McCall 767dbb26db1d426fb6caaaf1b4fa47b46d1947c12c9Douglas Gregor // Sort all the scalar case values so we can easily detect duplicates. 768dbb26db1d426fb6caaaf1b4fa47b46d1947c12c9Douglas Gregor std::stable_sort(CaseVals.begin(), CaseVals.end(), CmpCaseVals); 769dbb26db1d426fb6caaaf1b4fa47b46d1947c12c9Douglas Gregor 770dbb26db1d426fb6caaaf1b4fa47b46d1947c12c9Douglas Gregor if (!CaseVals.empty()) { 7710fb97083cc0f8a82e404e22991ae80d2216e71d5John McCall for (unsigned i = 0, e = CaseVals.size(); i != e; ++i) { 7720fb97083cc0f8a82e404e22991ae80d2216e71d5John McCall if (ShouldCheckConstantCond && 7730fb97083cc0f8a82e404e22991ae80d2216e71d5John McCall CaseVals[i].first == ConstantCondValue) 7740fb97083cc0f8a82e404e22991ae80d2216e71d5John McCall ShouldCheckConstantCond = false; 7750fb97083cc0f8a82e404e22991ae80d2216e71d5John McCall 7760fb97083cc0f8a82e404e22991ae80d2216e71d5John McCall if (i != 0 && CaseVals[i].first == CaseVals[i-1].first) { 777dbb26db1d426fb6caaaf1b4fa47b46d1947c12c9Douglas Gregor // If we have a duplicate, report it. 7783940ce83438e2332ba541f4e65e700fbefe0c7a8Douglas Gregor // First, determine if either case value has a name 7793940ce83438e2332ba541f4e65e700fbefe0c7a8Douglas Gregor StringRef PrevString, CurrString; 7803940ce83438e2332ba541f4e65e700fbefe0c7a8Douglas Gregor Expr *PrevCase = CaseVals[i-1].second->getLHS()->IgnoreParenCasts(); 7813940ce83438e2332ba541f4e65e700fbefe0c7a8Douglas Gregor Expr *CurrCase = CaseVals[i].second->getLHS()->IgnoreParenCasts(); 7823940ce83438e2332ba541f4e65e700fbefe0c7a8Douglas Gregor if (DeclRefExpr *DeclRef = dyn_cast<DeclRefExpr>(PrevCase)) { 7833940ce83438e2332ba541f4e65e700fbefe0c7a8Douglas Gregor PrevString = DeclRef->getDecl()->getName(); 7843940ce83438e2332ba541f4e65e700fbefe0c7a8Douglas Gregor } 7853940ce83438e2332ba541f4e65e700fbefe0c7a8Douglas Gregor if (DeclRefExpr *DeclRef = dyn_cast<DeclRefExpr>(CurrCase)) { 7863940ce83438e2332ba541f4e65e700fbefe0c7a8Douglas Gregor CurrString = DeclRef->getDecl()->getName(); 7873940ce83438e2332ba541f4e65e700fbefe0c7a8Douglas Gregor } 78850de5e3247a20e0e548dc47022a011250e6e4e8fDouglas Gregor llvm::SmallString<16> CaseValStr; 78950de5e3247a20e0e548dc47022a011250e6e4e8fDouglas Gregor CaseVals[i-1].first.toString(CaseValStr); 7903940ce83438e2332ba541f4e65e700fbefe0c7a8Douglas Gregor 7913940ce83438e2332ba541f4e65e700fbefe0c7a8Douglas Gregor if (PrevString == CurrString) 7923940ce83438e2332ba541f4e65e700fbefe0c7a8Douglas Gregor Diag(CaseVals[i].second->getLHS()->getLocStart(), 7933940ce83438e2332ba541f4e65e700fbefe0c7a8Douglas Gregor diag::err_duplicate_case) << 79450de5e3247a20e0e548dc47022a011250e6e4e8fDouglas Gregor (PrevString.empty() ? CaseValStr.str() : PrevString); 7953940ce83438e2332ba541f4e65e700fbefe0c7a8Douglas Gregor else 7963940ce83438e2332ba541f4e65e700fbefe0c7a8Douglas Gregor Diag(CaseVals[i].second->getLHS()->getLocStart(), 7973940ce83438e2332ba541f4e65e700fbefe0c7a8Douglas Gregor diag::err_duplicate_case_differing_expr) << 79850de5e3247a20e0e548dc47022a011250e6e4e8fDouglas Gregor (PrevString.empty() ? CaseValStr.str() : PrevString) << 79950de5e3247a20e0e548dc47022a011250e6e4e8fDouglas Gregor (CurrString.empty() ? CaseValStr.str() : CurrString) << 8003940ce83438e2332ba541f4e65e700fbefe0c7a8Douglas Gregor CaseValStr; 8013940ce83438e2332ba541f4e65e700fbefe0c7a8Douglas Gregor 8020fb97083cc0f8a82e404e22991ae80d2216e71d5John McCall Diag(CaseVals[i-1].second->getLHS()->getLocStart(), 803dbb26db1d426fb6caaaf1b4fa47b46d1947c12c9Douglas Gregor diag::note_duplicate_case_prev); 804390b4cc8b45a05612349269ef08faab3e4688f06Mike Stump // FIXME: We really want to remove the bogus case stmt from the 805390b4cc8b45a05612349269ef08faab3e4688f06Mike Stump // substmt, but we have no way to do this right now. 806dbb26db1d426fb6caaaf1b4fa47b46d1947c12c9Douglas Gregor CaseListIsErroneous = true; 807dbb26db1d426fb6caaaf1b4fa47b46d1947c12c9Douglas Gregor } 8086efc4d3659632ddcea4a58cb62e9ee54ca4a373eChris Lattner } 809b2ec9d6fede9cccc170a202de7bf7f523dea8be4Chris Lattner } 8101eb4433ac451dc16f4133a88af2d002ac26c58efMike Stump 811dbb26db1d426fb6caaaf1b4fa47b46d1947c12c9Douglas Gregor // Detect duplicate case ranges, which usually don't exist at all in 812dbb26db1d426fb6caaaf1b4fa47b46d1947c12c9Douglas Gregor // the first place. 813dbb26db1d426fb6caaaf1b4fa47b46d1947c12c9Douglas Gregor if (!CaseRanges.empty()) { 814dbb26db1d426fb6caaaf1b4fa47b46d1947c12c9Douglas Gregor // Sort all the case ranges by their low value so we can easily detect 815dbb26db1d426fb6caaaf1b4fa47b46d1947c12c9Douglas Gregor // overlaps between ranges. 816dbb26db1d426fb6caaaf1b4fa47b46d1947c12c9Douglas Gregor std::stable_sort(CaseRanges.begin(), CaseRanges.end()); 8171eb4433ac451dc16f4133a88af2d002ac26c58efMike Stump 818dbb26db1d426fb6caaaf1b4fa47b46d1947c12c9Douglas Gregor // Scan the ranges, computing the high values and removing empty ranges. 819dbb26db1d426fb6caaaf1b4fa47b46d1947c12c9Douglas Gregor std::vector<llvm::APSInt> HiVals; 820dbb26db1d426fb6caaaf1b4fa47b46d1947c12c9Douglas Gregor for (unsigned i = 0, e = CaseRanges.size(); i != e; ++i) { 8210fb97083cc0f8a82e404e22991ae80d2216e71d5John McCall llvm::APSInt &LoVal = CaseRanges[i].first; 822dbb26db1d426fb6caaaf1b4fa47b46d1947c12c9Douglas Gregor CaseStmt *CR = CaseRanges[i].second; 823dbb26db1d426fb6caaaf1b4fa47b46d1947c12c9Douglas Gregor Expr *Hi = CR->getRHS(); 8248ef7b203332b0c8d65876a1f5e6d1db4e6f40e4bRichard Smith llvm::APSInt HiVal; 8258ef7b203332b0c8d65876a1f5e6d1db4e6f40e4bRichard Smith 8264e4d08403ca5cfd4d558fa2936215d3a4e5a528dDavid Blaikie if (getLangOpts().CPlusPlus0x) { 8278ef7b203332b0c8d65876a1f5e6d1db4e6f40e4bRichard Smith // C++11 [stmt.switch]p2: the constant-expression shall be a converted 8288ef7b203332b0c8d65876a1f5e6d1db4e6f40e4bRichard Smith // constant expression of the promoted type of the switch condition. 8298ef7b203332b0c8d65876a1f5e6d1db4e6f40e4bRichard Smith ExprResult ConvHi = 8308ef7b203332b0c8d65876a1f5e6d1db4e6f40e4bRichard Smith CheckConvertedConstantExpression(Hi, CondType, HiVal, 8318ef7b203332b0c8d65876a1f5e6d1db4e6f40e4bRichard Smith CCEK_CaseValue); 8328ef7b203332b0c8d65876a1f5e6d1db4e6f40e4bRichard Smith if (ConvHi.isInvalid()) { 8338ef7b203332b0c8d65876a1f5e6d1db4e6f40e4bRichard Smith CaseListIsErroneous = true; 8348ef7b203332b0c8d65876a1f5e6d1db4e6f40e4bRichard Smith continue; 8358ef7b203332b0c8d65876a1f5e6d1db4e6f40e4bRichard Smith } 8368ef7b203332b0c8d65876a1f5e6d1db4e6f40e4bRichard Smith Hi = ConvHi.take(); 8378ef7b203332b0c8d65876a1f5e6d1db4e6f40e4bRichard Smith } else { 8388ef7b203332b0c8d65876a1f5e6d1db4e6f40e4bRichard Smith HiVal = Hi->EvaluateKnownConstInt(Context); 8398ef7b203332b0c8d65876a1f5e6d1db4e6f40e4bRichard Smith 8408ef7b203332b0c8d65876a1f5e6d1db4e6f40e4bRichard Smith // If the RHS is not the same type as the condition, insert an 8418ef7b203332b0c8d65876a1f5e6d1db4e6f40e4bRichard Smith // implicit cast. 8428ef7b203332b0c8d65876a1f5e6d1db4e6f40e4bRichard Smith Hi = DefaultLvalueConversion(Hi).take(); 8438ef7b203332b0c8d65876a1f5e6d1db4e6f40e4bRichard Smith Hi = ImpCastExprToType(Hi, CondType, CK_IntegralCast).take(); 8448ef7b203332b0c8d65876a1f5e6d1db4e6f40e4bRichard Smith } 8451eb4433ac451dc16f4133a88af2d002ac26c58efMike Stump 846dbb26db1d426fb6caaaf1b4fa47b46d1947c12c9Douglas Gregor // Convert the value to the same width/sign as the condition. 847dbb26db1d426fb6caaaf1b4fa47b46d1947c12c9Douglas Gregor ConvertIntegerToTypeWarnOnOverflow(HiVal, CondWidth, CondIsSigned, 84828164ab2ac1deea68cdb989f941728bf1860ce41Gabor Greif Hi->getLocStart(), 849dbb26db1d426fb6caaaf1b4fa47b46d1947c12c9Douglas Gregor diag::warn_case_value_overflow); 8501eb4433ac451dc16f4133a88af2d002ac26c58efMike Stump 851dbb26db1d426fb6caaaf1b4fa47b46d1947c12c9Douglas Gregor CR->setRHS(Hi); 8521eb4433ac451dc16f4133a88af2d002ac26c58efMike Stump 853dbb26db1d426fb6caaaf1b4fa47b46d1947c12c9Douglas Gregor // If the low value is bigger than the high value, the case is empty. 8540fb97083cc0f8a82e404e22991ae80d2216e71d5John McCall if (LoVal > HiVal) { 855dbb26db1d426fb6caaaf1b4fa47b46d1947c12c9Douglas Gregor Diag(CR->getLHS()->getLocStart(), diag::warn_case_empty_range) 856dbb26db1d426fb6caaaf1b4fa47b46d1947c12c9Douglas Gregor << SourceRange(CR->getLHS()->getLocStart(), 85728164ab2ac1deea68cdb989f941728bf1860ce41Gabor Greif Hi->getLocEnd()); 858dbb26db1d426fb6caaaf1b4fa47b46d1947c12c9Douglas Gregor CaseRanges.erase(CaseRanges.begin()+i); 859dbb26db1d426fb6caaaf1b4fa47b46d1947c12c9Douglas Gregor --i, --e; 860dbb26db1d426fb6caaaf1b4fa47b46d1947c12c9Douglas Gregor continue; 861dbb26db1d426fb6caaaf1b4fa47b46d1947c12c9Douglas Gregor } 8620fb97083cc0f8a82e404e22991ae80d2216e71d5John McCall 8630fb97083cc0f8a82e404e22991ae80d2216e71d5John McCall if (ShouldCheckConstantCond && 8640fb97083cc0f8a82e404e22991ae80d2216e71d5John McCall LoVal <= ConstantCondValue && 8650fb97083cc0f8a82e404e22991ae80d2216e71d5John McCall ConstantCondValue <= HiVal) 8660fb97083cc0f8a82e404e22991ae80d2216e71d5John McCall ShouldCheckConstantCond = false; 8670fb97083cc0f8a82e404e22991ae80d2216e71d5John McCall 868dbb26db1d426fb6caaaf1b4fa47b46d1947c12c9Douglas Gregor HiVals.push_back(HiVal); 8690471f5bc8191e39cdb61fabcaf1870e2af2d42e8Chris Lattner } 8701eb4433ac451dc16f4133a88af2d002ac26c58efMike Stump 871dbb26db1d426fb6caaaf1b4fa47b46d1947c12c9Douglas Gregor // Rescan the ranges, looking for overlap with singleton values and other 872dbb26db1d426fb6caaaf1b4fa47b46d1947c12c9Douglas Gregor // ranges. Since the range list is sorted, we only need to compare case 873dbb26db1d426fb6caaaf1b4fa47b46d1947c12c9Douglas Gregor // ranges with their neighbors. 874dbb26db1d426fb6caaaf1b4fa47b46d1947c12c9Douglas Gregor for (unsigned i = 0, e = CaseRanges.size(); i != e; ++i) { 875dbb26db1d426fb6caaaf1b4fa47b46d1947c12c9Douglas Gregor llvm::APSInt &CRLo = CaseRanges[i].first; 876dbb26db1d426fb6caaaf1b4fa47b46d1947c12c9Douglas Gregor llvm::APSInt &CRHi = HiVals[i]; 877dbb26db1d426fb6caaaf1b4fa47b46d1947c12c9Douglas Gregor CaseStmt *CR = CaseRanges[i].second; 8781eb4433ac451dc16f4133a88af2d002ac26c58efMike Stump 879dbb26db1d426fb6caaaf1b4fa47b46d1947c12c9Douglas Gregor // Check to see whether the case range overlaps with any 880dbb26db1d426fb6caaaf1b4fa47b46d1947c12c9Douglas Gregor // singleton cases. 881dbb26db1d426fb6caaaf1b4fa47b46d1947c12c9Douglas Gregor CaseStmt *OverlapStmt = 0; 882dbb26db1d426fb6caaaf1b4fa47b46d1947c12c9Douglas Gregor llvm::APSInt OverlapVal(32); 8831eb4433ac451dc16f4133a88af2d002ac26c58efMike Stump 884dbb26db1d426fb6caaaf1b4fa47b46d1947c12c9Douglas Gregor // Find the smallest value >= the lower bound. If I is in the 885dbb26db1d426fb6caaaf1b4fa47b46d1947c12c9Douglas Gregor // case range, then we have overlap. 886dbb26db1d426fb6caaaf1b4fa47b46d1947c12c9Douglas Gregor CaseValsTy::iterator I = std::lower_bound(CaseVals.begin(), 887dbb26db1d426fb6caaaf1b4fa47b46d1947c12c9Douglas Gregor CaseVals.end(), CRLo, 888dbb26db1d426fb6caaaf1b4fa47b46d1947c12c9Douglas Gregor CaseCompareFunctor()); 889dbb26db1d426fb6caaaf1b4fa47b46d1947c12c9Douglas Gregor if (I != CaseVals.end() && I->first < CRHi) { 890dbb26db1d426fb6caaaf1b4fa47b46d1947c12c9Douglas Gregor OverlapVal = I->first; // Found overlap with scalar. 891dbb26db1d426fb6caaaf1b4fa47b46d1947c12c9Douglas Gregor OverlapStmt = I->second; 892dbb26db1d426fb6caaaf1b4fa47b46d1947c12c9Douglas Gregor } 8931eb4433ac451dc16f4133a88af2d002ac26c58efMike Stump 894dbb26db1d426fb6caaaf1b4fa47b46d1947c12c9Douglas Gregor // Find the smallest value bigger than the upper bound. 895dbb26db1d426fb6caaaf1b4fa47b46d1947c12c9Douglas Gregor I = std::upper_bound(I, CaseVals.end(), CRHi, CaseCompareFunctor()); 896dbb26db1d426fb6caaaf1b4fa47b46d1947c12c9Douglas Gregor if (I != CaseVals.begin() && (I-1)->first >= CRLo) { 897dbb26db1d426fb6caaaf1b4fa47b46d1947c12c9Douglas Gregor OverlapVal = (I-1)->first; // Found overlap with scalar. 898dbb26db1d426fb6caaaf1b4fa47b46d1947c12c9Douglas Gregor OverlapStmt = (I-1)->second; 899dbb26db1d426fb6caaaf1b4fa47b46d1947c12c9Douglas Gregor } 9001eb4433ac451dc16f4133a88af2d002ac26c58efMike Stump 901dbb26db1d426fb6caaaf1b4fa47b46d1947c12c9Douglas Gregor // Check to see if this case stmt overlaps with the subsequent 902dbb26db1d426fb6caaaf1b4fa47b46d1947c12c9Douglas Gregor // case range. 903dbb26db1d426fb6caaaf1b4fa47b46d1947c12c9Douglas Gregor if (i && CRLo <= HiVals[i-1]) { 904dbb26db1d426fb6caaaf1b4fa47b46d1947c12c9Douglas Gregor OverlapVal = HiVals[i-1]; // Found overlap with range. 905dbb26db1d426fb6caaaf1b4fa47b46d1947c12c9Douglas Gregor OverlapStmt = CaseRanges[i-1].second; 906dbb26db1d426fb6caaaf1b4fa47b46d1947c12c9Douglas Gregor } 9071eb4433ac451dc16f4133a88af2d002ac26c58efMike Stump 908dbb26db1d426fb6caaaf1b4fa47b46d1947c12c9Douglas Gregor if (OverlapStmt) { 909dbb26db1d426fb6caaaf1b4fa47b46d1947c12c9Douglas Gregor // If we have a duplicate, report it. 910dbb26db1d426fb6caaaf1b4fa47b46d1947c12c9Douglas Gregor Diag(CR->getLHS()->getLocStart(), diag::err_duplicate_case) 911dbb26db1d426fb6caaaf1b4fa47b46d1947c12c9Douglas Gregor << OverlapVal.toString(10); 9121eb4433ac451dc16f4133a88af2d002ac26c58efMike Stump Diag(OverlapStmt->getLHS()->getLocStart(), 913dbb26db1d426fb6caaaf1b4fa47b46d1947c12c9Douglas Gregor diag::note_duplicate_case_prev); 914390b4cc8b45a05612349269ef08faab3e4688f06Mike Stump // FIXME: We really want to remove the bogus case stmt from the 915390b4cc8b45a05612349269ef08faab3e4688f06Mike Stump // substmt, but we have no way to do this right now. 916dbb26db1d426fb6caaaf1b4fa47b46d1947c12c9Douglas Gregor CaseListIsErroneous = true; 917dbb26db1d426fb6caaaf1b4fa47b46d1947c12c9Douglas Gregor } 9180471f5bc8191e39cdb61fabcaf1870e2af2d42e8Chris Lattner } 919b2ec9d6fede9cccc170a202de7bf7f523dea8be4Chris Lattner } 920ba915af51ced751c46e7c2b9c6f3b59d2e668825Douglas Gregor 9210fb97083cc0f8a82e404e22991ae80d2216e71d5John McCall // Complain if we have a constant condition and we didn't find a match. 9220fb97083cc0f8a82e404e22991ae80d2216e71d5John McCall if (!CaseListIsErroneous && ShouldCheckConstantCond) { 9230fb97083cc0f8a82e404e22991ae80d2216e71d5John McCall // TODO: it would be nice if we printed enums as enums, chars as 9240fb97083cc0f8a82e404e22991ae80d2216e71d5John McCall // chars, etc. 9250fb97083cc0f8a82e404e22991ae80d2216e71d5John McCall Diag(CondExpr->getExprLoc(), diag::warn_missing_case_for_condition) 9260fb97083cc0f8a82e404e22991ae80d2216e71d5John McCall << ConstantCondValue.toString(10) 9270fb97083cc0f8a82e404e22991ae80d2216e71d5John McCall << CondExpr->getSourceRange(); 9280fb97083cc0f8a82e404e22991ae80d2216e71d5John McCall } 9290fb97083cc0f8a82e404e22991ae80d2216e71d5John McCall 9300fb97083cc0f8a82e404e22991ae80d2216e71d5John McCall // Check to see if switch is over an Enum and handles all of its 931559fb554602bedb57dbbf3cc14ac8a38264b4547Ted Kremenek // values. We only issue a warning if there is not 'default:', but 932559fb554602bedb57dbbf3cc14ac8a38264b4547Ted Kremenek // we still do the analysis to preserve this information in the AST 933559fb554602bedb57dbbf3cc14ac8a38264b4547Ted Kremenek // (which can be used by flow-based analyes). 9340fb97083cc0f8a82e404e22991ae80d2216e71d5John McCall // 935ce78461303f45fecb3460d1c49c9b71f27ad19c3Chris Lattner const EnumType *ET = CondTypeBeforePromotion->getAs<EnumType>(); 936559fb554602bedb57dbbf3cc14ac8a38264b4547Ted Kremenek 937ba915af51ced751c46e7c2b9c6f3b59d2e668825Douglas Gregor // If switch has default case, then ignore it. 938559fb554602bedb57dbbf3cc14ac8a38264b4547Ted Kremenek if (!CaseListIsErroneous && !HasConstantCond && ET) { 939ba915af51ced751c46e7c2b9c6f3b59d2e668825Douglas Gregor const EnumDecl *ED = ET->getDecl(); 9405f9e272e632e951b1efe824cd16acb4d96077930Chris Lattner typedef SmallVector<std::pair<llvm::APSInt, EnumConstantDecl*>, 64> 94158f14c012e5d739b09532bb12645dc161f88cfcfFrancois Pichet EnumValsTy; 942ba915af51ced751c46e7c2b9c6f3b59d2e668825Douglas Gregor EnumValsTy EnumVals; 943ba915af51ced751c46e7c2b9c6f3b59d2e668825Douglas Gregor 9440fb97083cc0f8a82e404e22991ae80d2216e71d5John McCall // Gather all enum values, set their type and sort them, 9450fb97083cc0f8a82e404e22991ae80d2216e71d5John McCall // allowing easier comparison with CaseVals. 9460fb97083cc0f8a82e404e22991ae80d2216e71d5John McCall for (EnumDecl::enumerator_iterator EDI = ED->enumerator_begin(); 94728164ab2ac1deea68cdb989f941728bf1860ce41Gabor Greif EDI != ED->enumerator_end(); ++EDI) { 94828164ab2ac1deea68cdb989f941728bf1860ce41Gabor Greif llvm::APSInt Val = EDI->getInitVal(); 94928164ab2ac1deea68cdb989f941728bf1860ce41Gabor Greif AdjustAPSInt(Val, CondWidth, CondIsSigned); 950581deb3da481053c4993c7600f97acf7768caac5David Blaikie EnumVals.push_back(std::make_pair(Val, *EDI)); 951ba915af51ced751c46e7c2b9c6f3b59d2e668825Douglas Gregor } 952ba915af51ced751c46e7c2b9c6f3b59d2e668825Douglas Gregor std::stable_sort(EnumVals.begin(), EnumVals.end(), CmpEnumVals); 9530fb97083cc0f8a82e404e22991ae80d2216e71d5John McCall EnumValsTy::iterator EIend = 9540fb97083cc0f8a82e404e22991ae80d2216e71d5John McCall std::unique(EnumVals.begin(), EnumVals.end(), EqEnumVals); 955559fb554602bedb57dbbf3cc14ac8a38264b4547Ted Kremenek 956559fb554602bedb57dbbf3cc14ac8a38264b4547Ted Kremenek // See which case values aren't in enum. 9579366750a5a97c8aeae1df4898ea849b087865195David Blaikie EnumValsTy::const_iterator EI = EnumVals.begin(); 9589366750a5a97c8aeae1df4898ea849b087865195David Blaikie for (CaseValsTy::const_iterator CI = CaseVals.begin(); 9599366750a5a97c8aeae1df4898ea849b087865195David Blaikie CI != CaseVals.end(); CI++) { 9609366750a5a97c8aeae1df4898ea849b087865195David Blaikie while (EI != EIend && EI->first < CI->first) 9619366750a5a97c8aeae1df4898ea849b087865195David Blaikie EI++; 9629366750a5a97c8aeae1df4898ea849b087865195David Blaikie if (EI == EIend || EI->first > CI->first) 9639366750a5a97c8aeae1df4898ea849b087865195David Blaikie Diag(CI->second->getLHS()->getExprLoc(), diag::warn_not_in_enum) 96454faba4f7f3f0e8f1376da1c459312596ad5486dFariborz Jahanian << CondTypeBeforePromotion; 9659366750a5a97c8aeae1df4898ea849b087865195David Blaikie } 9669366750a5a97c8aeae1df4898ea849b087865195David Blaikie // See which of case ranges aren't in enum 9679366750a5a97c8aeae1df4898ea849b087865195David Blaikie EI = EnumVals.begin(); 9689366750a5a97c8aeae1df4898ea849b087865195David Blaikie for (CaseRangesTy::const_iterator RI = CaseRanges.begin(); 9699366750a5a97c8aeae1df4898ea849b087865195David Blaikie RI != CaseRanges.end() && EI != EIend; RI++) { 9709366750a5a97c8aeae1df4898ea849b087865195David Blaikie while (EI != EIend && EI->first < RI->first) 9719366750a5a97c8aeae1df4898ea849b087865195David Blaikie EI++; 9729366750a5a97c8aeae1df4898ea849b087865195David Blaikie 9739366750a5a97c8aeae1df4898ea849b087865195David Blaikie if (EI == EIend || EI->first != RI->first) { 9749366750a5a97c8aeae1df4898ea849b087865195David Blaikie Diag(RI->second->getLHS()->getExprLoc(), diag::warn_not_in_enum) 97554faba4f7f3f0e8f1376da1c459312596ad5486dFariborz Jahanian << CondTypeBeforePromotion; 97647bb27f16882e4f5ababdd0cf6642bb904a9aaf8Ted Kremenek } 977e0ba9d1beeba01a96808c2fc61f9ca89acec313bTed Kremenek 9789366750a5a97c8aeae1df4898ea849b087865195David Blaikie llvm::APSInt Hi = 9799366750a5a97c8aeae1df4898ea849b087865195David Blaikie RI->second->getRHS()->EvaluateKnownConstInt(Context); 9809366750a5a97c8aeae1df4898ea849b087865195David Blaikie AdjustAPSInt(Hi, CondWidth, CondIsSigned); 9819366750a5a97c8aeae1df4898ea849b087865195David Blaikie while (EI != EIend && EI->first < Hi) 9829366750a5a97c8aeae1df4898ea849b087865195David Blaikie EI++; 9839366750a5a97c8aeae1df4898ea849b087865195David Blaikie if (EI == EIend || EI->first != Hi) 9849366750a5a97c8aeae1df4898ea849b087865195David Blaikie Diag(RI->second->getRHS()->getExprLoc(), diag::warn_not_in_enum) 98554faba4f7f3f0e8f1376da1c459312596ad5486dFariborz Jahanian << CondTypeBeforePromotion; 986ba915af51ced751c46e7c2b9c6f3b59d2e668825Douglas Gregor } 987dfbb02a16ac8c764b5ba1742450513d6212d2f9fNAKAMURA Takumi 988559fb554602bedb57dbbf3cc14ac8a38264b4547Ted Kremenek // Check which enum vals aren't in switch 989ba915af51ced751c46e7c2b9c6f3b59d2e668825Douglas Gregor CaseValsTy::const_iterator CI = CaseVals.begin(); 990ba915af51ced751c46e7c2b9c6f3b59d2e668825Douglas Gregor CaseRangesTy::const_iterator RI = CaseRanges.begin(); 991559fb554602bedb57dbbf3cc14ac8a38264b4547Ted Kremenek bool hasCasesNotInSwitch = false; 992559fb554602bedb57dbbf3cc14ac8a38264b4547Ted Kremenek 9935f9e272e632e951b1efe824cd16acb4d96077930Chris Lattner SmallVector<DeclarationName,8> UnhandledNames; 994dfbb02a16ac8c764b5ba1742450513d6212d2f9fNAKAMURA Takumi 9959366750a5a97c8aeae1df4898ea849b087865195David Blaikie for (EI = EnumVals.begin(); EI != EIend; EI++){ 996ce78461303f45fecb3460d1c49c9b71f27ad19c3Chris Lattner // Drop unneeded case values 997ba915af51ced751c46e7c2b9c6f3b59d2e668825Douglas Gregor llvm::APSInt CIVal; 998ba915af51ced751c46e7c2b9c6f3b59d2e668825Douglas Gregor while (CI != CaseVals.end() && CI->first < EI->first) 999ba915af51ced751c46e7c2b9c6f3b59d2e668825Douglas Gregor CI++; 1000dfbb02a16ac8c764b5ba1742450513d6212d2f9fNAKAMURA Takumi 1001ba915af51ced751c46e7c2b9c6f3b59d2e668825Douglas Gregor if (CI != CaseVals.end() && CI->first == EI->first) 1002ba915af51ced751c46e7c2b9c6f3b59d2e668825Douglas Gregor continue; 1003ba915af51ced751c46e7c2b9c6f3b59d2e668825Douglas Gregor 1004559fb554602bedb57dbbf3cc14ac8a38264b4547Ted Kremenek // Drop unneeded case ranges 1005ba915af51ced751c46e7c2b9c6f3b59d2e668825Douglas Gregor for (; RI != CaseRanges.end(); RI++) { 1006a6b8b2c09610b8bc4330e948ece8b940c2386406Richard Smith llvm::APSInt Hi = 1007a6b8b2c09610b8bc4330e948ece8b940c2386406Richard Smith RI->second->getRHS()->EvaluateKnownConstInt(Context); 100828164ab2ac1deea68cdb989f941728bf1860ce41Gabor Greif AdjustAPSInt(Hi, CondWidth, CondIsSigned); 1009ba915af51ced751c46e7c2b9c6f3b59d2e668825Douglas Gregor if (EI->first <= Hi) 1010ba915af51ced751c46e7c2b9c6f3b59d2e668825Douglas Gregor break; 1011ba915af51ced751c46e7c2b9c6f3b59d2e668825Douglas Gregor } 1012ba915af51ced751c46e7c2b9c6f3b59d2e668825Douglas Gregor 1013559fb554602bedb57dbbf3cc14ac8a38264b4547Ted Kremenek if (RI == CaseRanges.end() || EI->first < RI->first) { 101447bb27f16882e4f5ababdd0cf6642bb904a9aaf8Ted Kremenek hasCasesNotInSwitch = true; 101531ceb61172bca7ebc3fb90e9125864c7a29c55c0David Blaikie UnhandledNames.push_back(EI->second->getDeclName()); 101647bb27f16882e4f5ababdd0cf6642bb904a9aaf8Ted Kremenek } 1017ba915af51ced751c46e7c2b9c6f3b59d2e668825Douglas Gregor } 1018dfbb02a16ac8c764b5ba1742450513d6212d2f9fNAKAMURA Takumi 1019585d7795c2dddaa510b3bb1b3b18633bfcfdf643David Blaikie if (TheDefaultStmt && UnhandledNames.empty()) 1020585d7795c2dddaa510b3bb1b3b18633bfcfdf643David Blaikie Diag(TheDefaultStmt->getDefaultLoc(), diag::warn_unreachable_default); 102131ceb61172bca7ebc3fb90e9125864c7a29c55c0David Blaikie 1022ce78461303f45fecb3460d1c49c9b71f27ad19c3Chris Lattner // Produce a nice diagnostic if multiple values aren't handled. 1023ce78461303f45fecb3460d1c49c9b71f27ad19c3Chris Lattner switch (UnhandledNames.size()) { 1024ce78461303f45fecb3460d1c49c9b71f27ad19c3Chris Lattner case 0: break; 1025ce78461303f45fecb3460d1c49c9b71f27ad19c3Chris Lattner case 1: 1026585d7795c2dddaa510b3bb1b3b18633bfcfdf643David Blaikie Diag(CondExpr->getExprLoc(), TheDefaultStmt 1027585d7795c2dddaa510b3bb1b3b18633bfcfdf643David Blaikie ? diag::warn_def_missing_case1 : diag::warn_missing_case1) 1028ce78461303f45fecb3460d1c49c9b71f27ad19c3Chris Lattner << UnhandledNames[0]; 1029ce78461303f45fecb3460d1c49c9b71f27ad19c3Chris Lattner break; 1030ce78461303f45fecb3460d1c49c9b71f27ad19c3Chris Lattner case 2: 1031585d7795c2dddaa510b3bb1b3b18633bfcfdf643David Blaikie Diag(CondExpr->getExprLoc(), TheDefaultStmt 1032585d7795c2dddaa510b3bb1b3b18633bfcfdf643David Blaikie ? diag::warn_def_missing_case2 : diag::warn_missing_case2) 1033ce78461303f45fecb3460d1c49c9b71f27ad19c3Chris Lattner << UnhandledNames[0] << UnhandledNames[1]; 1034ce78461303f45fecb3460d1c49c9b71f27ad19c3Chris Lattner break; 1035ce78461303f45fecb3460d1c49c9b71f27ad19c3Chris Lattner case 3: 1036585d7795c2dddaa510b3bb1b3b18633bfcfdf643David Blaikie Diag(CondExpr->getExprLoc(), TheDefaultStmt 1037585d7795c2dddaa510b3bb1b3b18633bfcfdf643David Blaikie ? diag::warn_def_missing_case3 : diag::warn_missing_case3) 1038ce78461303f45fecb3460d1c49c9b71f27ad19c3Chris Lattner << UnhandledNames[0] << UnhandledNames[1] << UnhandledNames[2]; 1039ce78461303f45fecb3460d1c49c9b71f27ad19c3Chris Lattner break; 1040ce78461303f45fecb3460d1c49c9b71f27ad19c3Chris Lattner default: 1041585d7795c2dddaa510b3bb1b3b18633bfcfdf643David Blaikie Diag(CondExpr->getExprLoc(), TheDefaultStmt 1042585d7795c2dddaa510b3bb1b3b18633bfcfdf643David Blaikie ? diag::warn_def_missing_cases : diag::warn_missing_cases) 1043ce78461303f45fecb3460d1c49c9b71f27ad19c3Chris Lattner << (unsigned)UnhandledNames.size() 1044ce78461303f45fecb3460d1c49c9b71f27ad19c3Chris Lattner << UnhandledNames[0] << UnhandledNames[1] << UnhandledNames[2]; 1045ce78461303f45fecb3460d1c49c9b71f27ad19c3Chris Lattner break; 1046ce78461303f45fecb3460d1c49c9b71f27ad19c3Chris Lattner } 1047559fb554602bedb57dbbf3cc14ac8a38264b4547Ted Kremenek 1048559fb554602bedb57dbbf3cc14ac8a38264b4547Ted Kremenek if (!hasCasesNotInSwitch) 104947bb27f16882e4f5ababdd0cf6642bb904a9aaf8Ted Kremenek SS->setAllEnumCasesCovered(); 1050ba915af51ced751c46e7c2b9c6f3b59d2e668825Douglas Gregor } 1051b2ec9d6fede9cccc170a202de7bf7f523dea8be4Chris Lattner } 1052dbb26db1d426fb6caaaf1b4fa47b46d1947c12c9Douglas Gregor 1053625bb569df0c34feec0d52c0ec5215f21ef2e054Dmitri Gribenko DiagnoseEmptyStmtBody(CondExpr->getLocEnd(), BodyStmt, 1054625bb569df0c34feec0d52c0ec5215f21ef2e054Dmitri Gribenko diag::warn_empty_switch_body); 1055625bb569df0c34feec0d52c0ec5215f21ef2e054Dmitri Gribenko 1056390b4cc8b45a05612349269ef08faab3e4688f06Mike Stump // FIXME: If the case list was broken is some way, we don't have a good system 1057390b4cc8b45a05612349269ef08faab3e4688f06Mike Stump // to patch it up. Instead, just return the whole substmt as broken. 1058b2ec9d6fede9cccc170a202de7bf7f523dea8be4Chris Lattner if (CaseListIsErroneous) 1059de307473448fb3cebcb4c10090728300b53bca03Sebastian Redl return StmtError(); 1060de307473448fb3cebcb4c10090728300b53bca03Sebastian Redl 1061de307473448fb3cebcb4c10090728300b53bca03Sebastian Redl return Owned(SS); 10625f016e2cb5d11daeb237544de1c5d59f20fe1a6eReid Spencer} 10635f016e2cb5d11daeb237544de1c5d59f20fe1a6eReid Spencer 106460d7b3a319d84d688752be3870615ac0f111fb16John McCallStmtResult 1065dfbb02a16ac8c764b5ba1742450513d6212d2f9fNAKAMURA TakumiSema::ActOnWhileStmt(SourceLocation WhileLoc, FullExprArg Cond, 10669ae2f076ca5ab1feb3ba95629099ec2319833701John McCall Decl *CondVar, Stmt *Body) { 106760d7b3a319d84d688752be3870615ac0f111fb16John McCall ExprResult CondResult(Cond.release()); 1068dfbb02a16ac8c764b5ba1742450513d6212d2f9fNAKAMURA Takumi 10695656e14d91405417182171a705ed3e3d2d6d7aa3Douglas Gregor VarDecl *ConditionVar = 0; 1070d226f65006733ed7f709c3174f22ce33391cb58fJohn McCall if (CondVar) { 1071d226f65006733ed7f709c3174f22ce33391cb58fJohn McCall ConditionVar = cast<VarDecl>(CondVar); 1072586596fd7f7a336a2847b300c80614dcf39ab6d5Douglas Gregor CondResult = CheckConditionVariable(ConditionVar, WhileLoc, true); 107399e9b4d172f6877e6ba5ebe75bb8238721f5e01cDouglas Gregor if (CondResult.isInvalid()) 107499e9b4d172f6877e6ba5ebe75bb8238721f5e01cDouglas Gregor return StmtError(); 10755656e14d91405417182171a705ed3e3d2d6d7aa3Douglas Gregor } 10769ae2f076ca5ab1feb3ba95629099ec2319833701John McCall Expr *ConditionExpr = CondResult.take(); 107799e9b4d172f6877e6ba5ebe75bb8238721f5e01cDouglas Gregor if (!ConditionExpr) 107899e9b4d172f6877e6ba5ebe75bb8238721f5e01cDouglas Gregor return StmtError(); 1079dfbb02a16ac8c764b5ba1742450513d6212d2f9fNAKAMURA Takumi 10809ae2f076ca5ab1feb3ba95629099ec2319833701John McCall DiagnoseUnusedExprResult(Body); 10811eb4433ac451dc16f4133a88af2d002ac26c58efMike Stump 1082625bb569df0c34feec0d52c0ec5215f21ef2e054Dmitri Gribenko if (isa<NullStmt>(Body)) 1083625bb569df0c34feec0d52c0ec5215f21ef2e054Dmitri Gribenko getCurCompoundScope().setHasEmptyLoopBodies(); 1084625bb569df0c34feec0d52c0ec5215f21ef2e054Dmitri Gribenko 108543dec6bbde2d0a16c35978983761c8b7030c8e18Douglas Gregor return Owned(new (Context) WhileStmt(Context, ConditionVar, ConditionExpr, 10869ae2f076ca5ab1feb3ba95629099ec2319833701John McCall Body, WhileLoc)); 10875f016e2cb5d11daeb237544de1c5d59f20fe1a6eReid Spencer} 10885f016e2cb5d11daeb237544de1c5d59f20fe1a6eReid Spencer 108960d7b3a319d84d688752be3870615ac0f111fb16John McCallStmtResult 10909ae2f076ca5ab1feb3ba95629099ec2319833701John McCallSema::ActOnDoStmt(SourceLocation DoLoc, Stmt *Body, 1091989135901c750af61ef012b6b0a0368be415bc46Chris Lattner SourceLocation WhileLoc, SourceLocation CondLParen, 10929ae2f076ca5ab1feb3ba95629099ec2319833701John McCall Expr *Cond, SourceLocation CondRParen) { 10939ae2f076ca5ab1feb3ba95629099ec2319833701John McCall assert(Cond && "ActOnDoStmt(): missing expression"); 1094f05b1520d6f175acbfc3913489f4dfa842875ec4Sebastian Redl 1095429bb276991ff2dbc7c5b438828b9b7737cb15ebJohn Wiegley ExprResult CondResult = CheckBooleanCondition(Cond, DoLoc); 1096429bb276991ff2dbc7c5b438828b9b7737cb15ebJohn Wiegley if (CondResult.isInvalid() || CondResult.isInvalid()) 10975a881bb09928b7ade891efc680088aaad276f8d6John McCall return StmtError(); 1098429bb276991ff2dbc7c5b438828b9b7737cb15ebJohn Wiegley Cond = CondResult.take(); 10995f016e2cb5d11daeb237544de1c5d59f20fe1a6eReid Spencer 1100b4eb64d8426c0eaa58d398961e0e74ff85063d7cJohn McCall CheckImplicitConversions(Cond, DoLoc); 1101429bb276991ff2dbc7c5b438828b9b7737cb15ebJohn Wiegley CondResult = MaybeCreateExprWithCleanups(Cond); 11029ae2f076ca5ab1feb3ba95629099ec2319833701John McCall if (CondResult.isInvalid()) 1103586596fd7f7a336a2847b300c80614dcf39ab6d5Douglas Gregor return StmtError(); 11049ae2f076ca5ab1feb3ba95629099ec2319833701John McCall Cond = CondResult.take(); 1105dfbb02a16ac8c764b5ba1742450513d6212d2f9fNAKAMURA Takumi 11069ae2f076ca5ab1feb3ba95629099ec2319833701John McCall DiagnoseUnusedExprResult(Body); 1107754431107b61a0523df5271c2876a73dd5a051e9Anders Carlsson 11089ae2f076ca5ab1feb3ba95629099ec2319833701John McCall return Owned(new (Context) DoStmt(Body, Cond, DoLoc, WhileLoc, CondRParen)); 11095f016e2cb5d11daeb237544de1c5d59f20fe1a6eReid Spencer} 11105f016e2cb5d11daeb237544de1c5d59f20fe1a6eReid Spencer 1111694e796f462748ab4dc7ecdf4be5da44dd2c8c94Richard Trieunamespace { 1112694e796f462748ab4dc7ecdf4be5da44dd2c8c94Richard Trieu // This visitor will traverse a conditional statement and store all 1113694e796f462748ab4dc7ecdf4be5da44dd2c8c94Richard Trieu // the evaluated decls into a vector. Simple is set to true if none 1114694e796f462748ab4dc7ecdf4be5da44dd2c8c94Richard Trieu // of the excluded constructs are used. 1115694e796f462748ab4dc7ecdf4be5da44dd2c8c94Richard Trieu class DeclExtractor : public EvaluatedExprVisitor<DeclExtractor> { 1116694e796f462748ab4dc7ecdf4be5da44dd2c8c94Richard Trieu llvm::SmallPtrSet<VarDecl*, 8> &Decls; 1117694e796f462748ab4dc7ecdf4be5da44dd2c8c94Richard Trieu llvm::SmallVector<SourceRange, 10> &Ranges; 1118694e796f462748ab4dc7ecdf4be5da44dd2c8c94Richard Trieu bool Simple; 1119694e796f462748ab4dc7ecdf4be5da44dd2c8c94Richard Trieupublic: 1120694e796f462748ab4dc7ecdf4be5da44dd2c8c94Richard Trieu typedef EvaluatedExprVisitor<DeclExtractor> Inherited; 1121694e796f462748ab4dc7ecdf4be5da44dd2c8c94Richard Trieu 1122694e796f462748ab4dc7ecdf4be5da44dd2c8c94Richard Trieu DeclExtractor(Sema &S, llvm::SmallPtrSet<VarDecl*, 8> &Decls, 1123facde171ae4b8926622a1bffa833732a06f1875bBenjamin Kramer llvm::SmallVector<SourceRange, 10> &Ranges) : 1124694e796f462748ab4dc7ecdf4be5da44dd2c8c94Richard Trieu Inherited(S.Context), 1125694e796f462748ab4dc7ecdf4be5da44dd2c8c94Richard Trieu Decls(Decls), 1126694e796f462748ab4dc7ecdf4be5da44dd2c8c94Richard Trieu Ranges(Ranges), 1127facde171ae4b8926622a1bffa833732a06f1875bBenjamin Kramer Simple(true) {} 1128694e796f462748ab4dc7ecdf4be5da44dd2c8c94Richard Trieu 1129694e796f462748ab4dc7ecdf4be5da44dd2c8c94Richard Trieu bool isSimple() { return Simple; } 1130694e796f462748ab4dc7ecdf4be5da44dd2c8c94Richard Trieu 1131694e796f462748ab4dc7ecdf4be5da44dd2c8c94Richard Trieu // Replaces the method in EvaluatedExprVisitor. 1132694e796f462748ab4dc7ecdf4be5da44dd2c8c94Richard Trieu void VisitMemberExpr(MemberExpr* E) { 1133694e796f462748ab4dc7ecdf4be5da44dd2c8c94Richard Trieu Simple = false; 1134694e796f462748ab4dc7ecdf4be5da44dd2c8c94Richard Trieu } 1135694e796f462748ab4dc7ecdf4be5da44dd2c8c94Richard Trieu 1136694e796f462748ab4dc7ecdf4be5da44dd2c8c94Richard Trieu // Any Stmt not whitelisted will cause the condition to be marked complex. 1137694e796f462748ab4dc7ecdf4be5da44dd2c8c94Richard Trieu void VisitStmt(Stmt *S) { 1138694e796f462748ab4dc7ecdf4be5da44dd2c8c94Richard Trieu Simple = false; 1139694e796f462748ab4dc7ecdf4be5da44dd2c8c94Richard Trieu } 1140694e796f462748ab4dc7ecdf4be5da44dd2c8c94Richard Trieu 1141694e796f462748ab4dc7ecdf4be5da44dd2c8c94Richard Trieu void VisitBinaryOperator(BinaryOperator *E) { 1142694e796f462748ab4dc7ecdf4be5da44dd2c8c94Richard Trieu Visit(E->getLHS()); 1143694e796f462748ab4dc7ecdf4be5da44dd2c8c94Richard Trieu Visit(E->getRHS()); 1144694e796f462748ab4dc7ecdf4be5da44dd2c8c94Richard Trieu } 1145694e796f462748ab4dc7ecdf4be5da44dd2c8c94Richard Trieu 1146694e796f462748ab4dc7ecdf4be5da44dd2c8c94Richard Trieu void VisitCastExpr(CastExpr *E) { 1147694e796f462748ab4dc7ecdf4be5da44dd2c8c94Richard Trieu Visit(E->getSubExpr()); 1148694e796f462748ab4dc7ecdf4be5da44dd2c8c94Richard Trieu } 1149694e796f462748ab4dc7ecdf4be5da44dd2c8c94Richard Trieu 1150694e796f462748ab4dc7ecdf4be5da44dd2c8c94Richard Trieu void VisitUnaryOperator(UnaryOperator *E) { 1151694e796f462748ab4dc7ecdf4be5da44dd2c8c94Richard Trieu // Skip checking conditionals with derefernces. 1152694e796f462748ab4dc7ecdf4be5da44dd2c8c94Richard Trieu if (E->getOpcode() == UO_Deref) 1153694e796f462748ab4dc7ecdf4be5da44dd2c8c94Richard Trieu Simple = false; 1154694e796f462748ab4dc7ecdf4be5da44dd2c8c94Richard Trieu else 1155694e796f462748ab4dc7ecdf4be5da44dd2c8c94Richard Trieu Visit(E->getSubExpr()); 1156694e796f462748ab4dc7ecdf4be5da44dd2c8c94Richard Trieu } 1157694e796f462748ab4dc7ecdf4be5da44dd2c8c94Richard Trieu 1158694e796f462748ab4dc7ecdf4be5da44dd2c8c94Richard Trieu void VisitConditionalOperator(ConditionalOperator *E) { 1159694e796f462748ab4dc7ecdf4be5da44dd2c8c94Richard Trieu Visit(E->getCond()); 1160694e796f462748ab4dc7ecdf4be5da44dd2c8c94Richard Trieu Visit(E->getTrueExpr()); 1161694e796f462748ab4dc7ecdf4be5da44dd2c8c94Richard Trieu Visit(E->getFalseExpr()); 1162694e796f462748ab4dc7ecdf4be5da44dd2c8c94Richard Trieu } 1163694e796f462748ab4dc7ecdf4be5da44dd2c8c94Richard Trieu 1164694e796f462748ab4dc7ecdf4be5da44dd2c8c94Richard Trieu void VisitParenExpr(ParenExpr *E) { 1165694e796f462748ab4dc7ecdf4be5da44dd2c8c94Richard Trieu Visit(E->getSubExpr()); 1166694e796f462748ab4dc7ecdf4be5da44dd2c8c94Richard Trieu } 1167694e796f462748ab4dc7ecdf4be5da44dd2c8c94Richard Trieu 1168694e796f462748ab4dc7ecdf4be5da44dd2c8c94Richard Trieu void VisitBinaryConditionalOperator(BinaryConditionalOperator *E) { 1169694e796f462748ab4dc7ecdf4be5da44dd2c8c94Richard Trieu Visit(E->getOpaqueValue()->getSourceExpr()); 1170694e796f462748ab4dc7ecdf4be5da44dd2c8c94Richard Trieu Visit(E->getFalseExpr()); 1171694e796f462748ab4dc7ecdf4be5da44dd2c8c94Richard Trieu } 1172694e796f462748ab4dc7ecdf4be5da44dd2c8c94Richard Trieu 1173694e796f462748ab4dc7ecdf4be5da44dd2c8c94Richard Trieu void VisitIntegerLiteral(IntegerLiteral *E) { } 1174694e796f462748ab4dc7ecdf4be5da44dd2c8c94Richard Trieu void VisitFloatingLiteral(FloatingLiteral *E) { } 1175694e796f462748ab4dc7ecdf4be5da44dd2c8c94Richard Trieu void VisitCXXBoolLiteralExpr(CXXBoolLiteralExpr *E) { } 1176694e796f462748ab4dc7ecdf4be5da44dd2c8c94Richard Trieu void VisitCharacterLiteral(CharacterLiteral *E) { } 1177694e796f462748ab4dc7ecdf4be5da44dd2c8c94Richard Trieu void VisitGNUNullExpr(GNUNullExpr *E) { } 1178694e796f462748ab4dc7ecdf4be5da44dd2c8c94Richard Trieu void VisitImaginaryLiteral(ImaginaryLiteral *E) { } 1179694e796f462748ab4dc7ecdf4be5da44dd2c8c94Richard Trieu 1180694e796f462748ab4dc7ecdf4be5da44dd2c8c94Richard Trieu void VisitDeclRefExpr(DeclRefExpr *E) { 1181694e796f462748ab4dc7ecdf4be5da44dd2c8c94Richard Trieu VarDecl *VD = dyn_cast<VarDecl>(E->getDecl()); 1182694e796f462748ab4dc7ecdf4be5da44dd2c8c94Richard Trieu if (!VD) return; 1183694e796f462748ab4dc7ecdf4be5da44dd2c8c94Richard Trieu 1184694e796f462748ab4dc7ecdf4be5da44dd2c8c94Richard Trieu Ranges.push_back(E->getSourceRange()); 1185694e796f462748ab4dc7ecdf4be5da44dd2c8c94Richard Trieu 1186694e796f462748ab4dc7ecdf4be5da44dd2c8c94Richard Trieu Decls.insert(VD); 1187694e796f462748ab4dc7ecdf4be5da44dd2c8c94Richard Trieu } 1188694e796f462748ab4dc7ecdf4be5da44dd2c8c94Richard Trieu 1189694e796f462748ab4dc7ecdf4be5da44dd2c8c94Richard Trieu }; // end class DeclExtractor 1190694e796f462748ab4dc7ecdf4be5da44dd2c8c94Richard Trieu 1191694e796f462748ab4dc7ecdf4be5da44dd2c8c94Richard Trieu // DeclMatcher checks to see if the decls are used in a non-evauluated 1192694e796f462748ab4dc7ecdf4be5da44dd2c8c94Richard Trieu // context. 1193694e796f462748ab4dc7ecdf4be5da44dd2c8c94Richard Trieu class DeclMatcher : public EvaluatedExprVisitor<DeclMatcher> { 1194694e796f462748ab4dc7ecdf4be5da44dd2c8c94Richard Trieu llvm::SmallPtrSet<VarDecl*, 8> &Decls; 1195694e796f462748ab4dc7ecdf4be5da44dd2c8c94Richard Trieu bool FoundDecl; 1196694e796f462748ab4dc7ecdf4be5da44dd2c8c94Richard Trieu 1197694e796f462748ab4dc7ecdf4be5da44dd2c8c94Richard Trieupublic: 1198694e796f462748ab4dc7ecdf4be5da44dd2c8c94Richard Trieu typedef EvaluatedExprVisitor<DeclMatcher> Inherited; 1199694e796f462748ab4dc7ecdf4be5da44dd2c8c94Richard Trieu 1200694e796f462748ab4dc7ecdf4be5da44dd2c8c94Richard Trieu DeclMatcher(Sema &S, llvm::SmallPtrSet<VarDecl*, 8> &Decls, Stmt *Statement) : 1201694e796f462748ab4dc7ecdf4be5da44dd2c8c94Richard Trieu Inherited(S.Context), Decls(Decls), FoundDecl(false) { 1202694e796f462748ab4dc7ecdf4be5da44dd2c8c94Richard Trieu if (!Statement) return; 1203694e796f462748ab4dc7ecdf4be5da44dd2c8c94Richard Trieu 1204694e796f462748ab4dc7ecdf4be5da44dd2c8c94Richard Trieu Visit(Statement); 1205694e796f462748ab4dc7ecdf4be5da44dd2c8c94Richard Trieu } 1206694e796f462748ab4dc7ecdf4be5da44dd2c8c94Richard Trieu 1207694e796f462748ab4dc7ecdf4be5da44dd2c8c94Richard Trieu void VisitReturnStmt(ReturnStmt *S) { 1208694e796f462748ab4dc7ecdf4be5da44dd2c8c94Richard Trieu FoundDecl = true; 1209694e796f462748ab4dc7ecdf4be5da44dd2c8c94Richard Trieu } 1210694e796f462748ab4dc7ecdf4be5da44dd2c8c94Richard Trieu 1211694e796f462748ab4dc7ecdf4be5da44dd2c8c94Richard Trieu void VisitBreakStmt(BreakStmt *S) { 1212694e796f462748ab4dc7ecdf4be5da44dd2c8c94Richard Trieu FoundDecl = true; 1213694e796f462748ab4dc7ecdf4be5da44dd2c8c94Richard Trieu } 1214694e796f462748ab4dc7ecdf4be5da44dd2c8c94Richard Trieu 1215694e796f462748ab4dc7ecdf4be5da44dd2c8c94Richard Trieu void VisitGotoStmt(GotoStmt *S) { 1216694e796f462748ab4dc7ecdf4be5da44dd2c8c94Richard Trieu FoundDecl = true; 1217694e796f462748ab4dc7ecdf4be5da44dd2c8c94Richard Trieu } 1218694e796f462748ab4dc7ecdf4be5da44dd2c8c94Richard Trieu 1219694e796f462748ab4dc7ecdf4be5da44dd2c8c94Richard Trieu void VisitCastExpr(CastExpr *E) { 1220694e796f462748ab4dc7ecdf4be5da44dd2c8c94Richard Trieu if (E->getCastKind() == CK_LValueToRValue) 1221694e796f462748ab4dc7ecdf4be5da44dd2c8c94Richard Trieu CheckLValueToRValueCast(E->getSubExpr()); 1222694e796f462748ab4dc7ecdf4be5da44dd2c8c94Richard Trieu else 1223694e796f462748ab4dc7ecdf4be5da44dd2c8c94Richard Trieu Visit(E->getSubExpr()); 1224694e796f462748ab4dc7ecdf4be5da44dd2c8c94Richard Trieu } 1225694e796f462748ab4dc7ecdf4be5da44dd2c8c94Richard Trieu 1226694e796f462748ab4dc7ecdf4be5da44dd2c8c94Richard Trieu void CheckLValueToRValueCast(Expr *E) { 1227694e796f462748ab4dc7ecdf4be5da44dd2c8c94Richard Trieu E = E->IgnoreParenImpCasts(); 1228694e796f462748ab4dc7ecdf4be5da44dd2c8c94Richard Trieu 1229694e796f462748ab4dc7ecdf4be5da44dd2c8c94Richard Trieu if (isa<DeclRefExpr>(E)) { 1230694e796f462748ab4dc7ecdf4be5da44dd2c8c94Richard Trieu return; 1231694e796f462748ab4dc7ecdf4be5da44dd2c8c94Richard Trieu } 1232694e796f462748ab4dc7ecdf4be5da44dd2c8c94Richard Trieu 1233694e796f462748ab4dc7ecdf4be5da44dd2c8c94Richard Trieu if (ConditionalOperator *CO = dyn_cast<ConditionalOperator>(E)) { 1234694e796f462748ab4dc7ecdf4be5da44dd2c8c94Richard Trieu Visit(CO->getCond()); 1235694e796f462748ab4dc7ecdf4be5da44dd2c8c94Richard Trieu CheckLValueToRValueCast(CO->getTrueExpr()); 1236694e796f462748ab4dc7ecdf4be5da44dd2c8c94Richard Trieu CheckLValueToRValueCast(CO->getFalseExpr()); 1237694e796f462748ab4dc7ecdf4be5da44dd2c8c94Richard Trieu return; 1238694e796f462748ab4dc7ecdf4be5da44dd2c8c94Richard Trieu } 1239694e796f462748ab4dc7ecdf4be5da44dd2c8c94Richard Trieu 1240694e796f462748ab4dc7ecdf4be5da44dd2c8c94Richard Trieu if (BinaryConditionalOperator *BCO = 1241694e796f462748ab4dc7ecdf4be5da44dd2c8c94Richard Trieu dyn_cast<BinaryConditionalOperator>(E)) { 1242694e796f462748ab4dc7ecdf4be5da44dd2c8c94Richard Trieu CheckLValueToRValueCast(BCO->getOpaqueValue()->getSourceExpr()); 1243694e796f462748ab4dc7ecdf4be5da44dd2c8c94Richard Trieu CheckLValueToRValueCast(BCO->getFalseExpr()); 1244694e796f462748ab4dc7ecdf4be5da44dd2c8c94Richard Trieu return; 1245694e796f462748ab4dc7ecdf4be5da44dd2c8c94Richard Trieu } 1246694e796f462748ab4dc7ecdf4be5da44dd2c8c94Richard Trieu 1247694e796f462748ab4dc7ecdf4be5da44dd2c8c94Richard Trieu Visit(E); 1248694e796f462748ab4dc7ecdf4be5da44dd2c8c94Richard Trieu } 1249694e796f462748ab4dc7ecdf4be5da44dd2c8c94Richard Trieu 1250694e796f462748ab4dc7ecdf4be5da44dd2c8c94Richard Trieu void VisitDeclRefExpr(DeclRefExpr *E) { 1251694e796f462748ab4dc7ecdf4be5da44dd2c8c94Richard Trieu if (VarDecl *VD = dyn_cast<VarDecl>(E->getDecl())) 1252694e796f462748ab4dc7ecdf4be5da44dd2c8c94Richard Trieu if (Decls.count(VD)) 1253694e796f462748ab4dc7ecdf4be5da44dd2c8c94Richard Trieu FoundDecl = true; 1254694e796f462748ab4dc7ecdf4be5da44dd2c8c94Richard Trieu } 1255694e796f462748ab4dc7ecdf4be5da44dd2c8c94Richard Trieu 1256694e796f462748ab4dc7ecdf4be5da44dd2c8c94Richard Trieu bool FoundDeclInUse() { return FoundDecl; } 1257694e796f462748ab4dc7ecdf4be5da44dd2c8c94Richard Trieu 1258694e796f462748ab4dc7ecdf4be5da44dd2c8c94Richard Trieu }; // end class DeclMatcher 1259694e796f462748ab4dc7ecdf4be5da44dd2c8c94Richard Trieu 1260694e796f462748ab4dc7ecdf4be5da44dd2c8c94Richard Trieu void CheckForLoopConditionalStatement(Sema &S, Expr *Second, 1261694e796f462748ab4dc7ecdf4be5da44dd2c8c94Richard Trieu Expr *Third, Stmt *Body) { 1262694e796f462748ab4dc7ecdf4be5da44dd2c8c94Richard Trieu // Condition is empty 1263694e796f462748ab4dc7ecdf4be5da44dd2c8c94Richard Trieu if (!Second) return; 1264694e796f462748ab4dc7ecdf4be5da44dd2c8c94Richard Trieu 1265694e796f462748ab4dc7ecdf4be5da44dd2c8c94Richard Trieu if (S.Diags.getDiagnosticLevel(diag::warn_variables_not_in_loop_body, 1266694e796f462748ab4dc7ecdf4be5da44dd2c8c94Richard Trieu Second->getLocStart()) 1267694e796f462748ab4dc7ecdf4be5da44dd2c8c94Richard Trieu == DiagnosticsEngine::Ignored) 1268694e796f462748ab4dc7ecdf4be5da44dd2c8c94Richard Trieu return; 1269694e796f462748ab4dc7ecdf4be5da44dd2c8c94Richard Trieu 1270694e796f462748ab4dc7ecdf4be5da44dd2c8c94Richard Trieu PartialDiagnostic PDiag = S.PDiag(diag::warn_variables_not_in_loop_body); 1271694e796f462748ab4dc7ecdf4be5da44dd2c8c94Richard Trieu llvm::SmallPtrSet<VarDecl*, 8> Decls; 1272694e796f462748ab4dc7ecdf4be5da44dd2c8c94Richard Trieu llvm::SmallVector<SourceRange, 10> Ranges; 1273facde171ae4b8926622a1bffa833732a06f1875bBenjamin Kramer DeclExtractor DE(S, Decls, Ranges); 1274694e796f462748ab4dc7ecdf4be5da44dd2c8c94Richard Trieu DE.Visit(Second); 1275694e796f462748ab4dc7ecdf4be5da44dd2c8c94Richard Trieu 1276694e796f462748ab4dc7ecdf4be5da44dd2c8c94Richard Trieu // Don't analyze complex conditionals. 1277694e796f462748ab4dc7ecdf4be5da44dd2c8c94Richard Trieu if (!DE.isSimple()) return; 1278694e796f462748ab4dc7ecdf4be5da44dd2c8c94Richard Trieu 1279694e796f462748ab4dc7ecdf4be5da44dd2c8c94Richard Trieu // No decls found. 1280694e796f462748ab4dc7ecdf4be5da44dd2c8c94Richard Trieu if (Decls.size() == 0) return; 1281694e796f462748ab4dc7ecdf4be5da44dd2c8c94Richard Trieu 12829087599e5ee64ecd30194b3d89f8748ac95c62f7Richard Trieu // Don't warn on volatile, static, or global variables. 1283694e796f462748ab4dc7ecdf4be5da44dd2c8c94Richard Trieu for (llvm::SmallPtrSet<VarDecl*, 8>::iterator I = Decls.begin(), 1284694e796f462748ab4dc7ecdf4be5da44dd2c8c94Richard Trieu E = Decls.end(); 1285694e796f462748ab4dc7ecdf4be5da44dd2c8c94Richard Trieu I != E; ++I) 12869087599e5ee64ecd30194b3d89f8748ac95c62f7Richard Trieu if ((*I)->getType().isVolatileQualified() || 12879087599e5ee64ecd30194b3d89f8748ac95c62f7Richard Trieu (*I)->hasGlobalStorage()) return; 1288694e796f462748ab4dc7ecdf4be5da44dd2c8c94Richard Trieu 1289694e796f462748ab4dc7ecdf4be5da44dd2c8c94Richard Trieu if (DeclMatcher(S, Decls, Second).FoundDeclInUse() || 1290694e796f462748ab4dc7ecdf4be5da44dd2c8c94Richard Trieu DeclMatcher(S, Decls, Third).FoundDeclInUse() || 1291694e796f462748ab4dc7ecdf4be5da44dd2c8c94Richard Trieu DeclMatcher(S, Decls, Body).FoundDeclInUse()) 1292694e796f462748ab4dc7ecdf4be5da44dd2c8c94Richard Trieu return; 1293694e796f462748ab4dc7ecdf4be5da44dd2c8c94Richard Trieu 1294694e796f462748ab4dc7ecdf4be5da44dd2c8c94Richard Trieu // Load decl names into diagnostic. 1295694e796f462748ab4dc7ecdf4be5da44dd2c8c94Richard Trieu if (Decls.size() > 4) 1296694e796f462748ab4dc7ecdf4be5da44dd2c8c94Richard Trieu PDiag << 0; 1297694e796f462748ab4dc7ecdf4be5da44dd2c8c94Richard Trieu else { 1298694e796f462748ab4dc7ecdf4be5da44dd2c8c94Richard Trieu PDiag << Decls.size(); 1299694e796f462748ab4dc7ecdf4be5da44dd2c8c94Richard Trieu for (llvm::SmallPtrSet<VarDecl*, 8>::iterator I = Decls.begin(), 1300694e796f462748ab4dc7ecdf4be5da44dd2c8c94Richard Trieu E = Decls.end(); 1301694e796f462748ab4dc7ecdf4be5da44dd2c8c94Richard Trieu I != E; ++I) 1302694e796f462748ab4dc7ecdf4be5da44dd2c8c94Richard Trieu PDiag << (*I)->getDeclName(); 1303694e796f462748ab4dc7ecdf4be5da44dd2c8c94Richard Trieu } 1304694e796f462748ab4dc7ecdf4be5da44dd2c8c94Richard Trieu 1305694e796f462748ab4dc7ecdf4be5da44dd2c8c94Richard Trieu // Load SourceRanges into diagnostic if there is room. 1306694e796f462748ab4dc7ecdf4be5da44dd2c8c94Richard Trieu // Otherwise, load the SourceRange of the conditional expression. 1307694e796f462748ab4dc7ecdf4be5da44dd2c8c94Richard Trieu if (Ranges.size() <= PartialDiagnostic::MaxArguments) 1308694e796f462748ab4dc7ecdf4be5da44dd2c8c94Richard Trieu for (llvm::SmallVector<SourceRange, 10>::iterator I = Ranges.begin(), 1309694e796f462748ab4dc7ecdf4be5da44dd2c8c94Richard Trieu E = Ranges.end(); 1310694e796f462748ab4dc7ecdf4be5da44dd2c8c94Richard Trieu I != E; ++I) 1311694e796f462748ab4dc7ecdf4be5da44dd2c8c94Richard Trieu PDiag << *I; 1312694e796f462748ab4dc7ecdf4be5da44dd2c8c94Richard Trieu else 1313694e796f462748ab4dc7ecdf4be5da44dd2c8c94Richard Trieu PDiag << Second->getSourceRange(); 1314694e796f462748ab4dc7ecdf4be5da44dd2c8c94Richard Trieu 1315694e796f462748ab4dc7ecdf4be5da44dd2c8c94Richard Trieu S.Diag(Ranges.begin()->getBegin(), PDiag); 1316694e796f462748ab4dc7ecdf4be5da44dd2c8c94Richard Trieu } 1317694e796f462748ab4dc7ecdf4be5da44dd2c8c94Richard Trieu 1318694e796f462748ab4dc7ecdf4be5da44dd2c8c94Richard Trieu} // end namespace 1319694e796f462748ab4dc7ecdf4be5da44dd2c8c94Richard Trieu 132060d7b3a319d84d688752be3870615ac0f111fb16John McCallStmtResult 1321f05b1520d6f175acbfc3913489f4dfa842875ec4Sebastian RedlSema::ActOnForStmt(SourceLocation ForLoc, SourceLocation LParenLoc, 13229ae2f076ca5ab1feb3ba95629099ec2319833701John McCall Stmt *First, FullExprArg second, Decl *secondVar, 132399e9b4d172f6877e6ba5ebe75bb8238721f5e01cDouglas Gregor FullExprArg third, 13249ae2f076ca5ab1feb3ba95629099ec2319833701John McCall SourceLocation RParenLoc, Stmt *Body) { 13254e4d08403ca5cfd4d558fa2936215d3a4e5a528dDavid Blaikie if (!getLangOpts().CPlusPlus) { 13265921093cf1c2e9a8bd1a22b6f612e551bae7476bArgyrios Kyrtzidis if (DeclStmt *DS = dyn_cast_or_null<DeclStmt>(First)) { 1327f3a41af4d5c98a72a1d6720bbbfd658e57ef2541Chris Lattner // C99 6.8.5p3: The declaration part of a 'for' statement shall only 1328f3a41af4d5c98a72a1d6720bbbfd658e57ef2541Chris Lattner // declare identifiers for objects having storage class 'auto' or 1329f3a41af4d5c98a72a1d6720bbbfd658e57ef2541Chris Lattner // 'register'. 13305921093cf1c2e9a8bd1a22b6f612e551bae7476bArgyrios Kyrtzidis for (DeclStmt::decl_iterator DI=DS->decl_begin(), DE=DS->decl_end(); 13315921093cf1c2e9a8bd1a22b6f612e551bae7476bArgyrios Kyrtzidis DI!=DE; ++DI) { 13325921093cf1c2e9a8bd1a22b6f612e551bae7476bArgyrios Kyrtzidis VarDecl *VD = dyn_cast<VarDecl>(*DI); 1333b6bbcc9995186799a60ce17d0c1acff31601653aJohn McCall if (VD && VD->isLocalVarDecl() && !VD->hasLocalStorage()) 13345921093cf1c2e9a8bd1a22b6f612e551bae7476bArgyrios Kyrtzidis VD = 0; 13355921093cf1c2e9a8bd1a22b6f612e551bae7476bArgyrios Kyrtzidis if (VD == 0) 13365921093cf1c2e9a8bd1a22b6f612e551bae7476bArgyrios Kyrtzidis Diag((*DI)->getLocation(), diag::err_non_variable_decl_in_for); 13375921093cf1c2e9a8bd1a22b6f612e551bae7476bArgyrios Kyrtzidis // FIXME: mark decl erroneous! 13385921093cf1c2e9a8bd1a22b6f612e551bae7476bArgyrios Kyrtzidis } 1339ae3b701f59e78e058b83344be17206af3bf5d277Chris Lattner } 13405f016e2cb5d11daeb237544de1c5d59f20fe1a6eReid Spencer } 134199e9b4d172f6877e6ba5ebe75bb8238721f5e01cDouglas Gregor 1342694e796f462748ab4dc7ecdf4be5da44dd2c8c94Richard Trieu CheckForLoopConditionalStatement(*this, second.get(), third.get(), Body); 1343694e796f462748ab4dc7ecdf4be5da44dd2c8c94Richard Trieu 134460d7b3a319d84d688752be3870615ac0f111fb16John McCall ExprResult SecondResult(second.release()); 134599e9b4d172f6877e6ba5ebe75bb8238721f5e01cDouglas Gregor VarDecl *ConditionVar = 0; 1346d226f65006733ed7f709c3174f22ce33391cb58fJohn McCall if (secondVar) { 1347d226f65006733ed7f709c3174f22ce33391cb58fJohn McCall ConditionVar = cast<VarDecl>(secondVar); 1348586596fd7f7a336a2847b300c80614dcf39ab6d5Douglas Gregor SecondResult = CheckConditionVariable(ConditionVar, ForLoc, true); 134999e9b4d172f6877e6ba5ebe75bb8238721f5e01cDouglas Gregor if (SecondResult.isInvalid()) 135099e9b4d172f6877e6ba5ebe75bb8238721f5e01cDouglas Gregor return StmtError(); 135199e9b4d172f6877e6ba5ebe75bb8238721f5e01cDouglas Gregor } 1352dfbb02a16ac8c764b5ba1742450513d6212d2f9fNAKAMURA Takumi 135399e9b4d172f6877e6ba5ebe75bb8238721f5e01cDouglas Gregor Expr *Third = third.release().takeAs<Expr>(); 1354dfbb02a16ac8c764b5ba1742450513d6212d2f9fNAKAMURA Takumi 13553af708ff19e4ae2bf9e40550548361b00e5916bfAnders Carlsson DiagnoseUnusedExprResult(First); 13563af708ff19e4ae2bf9e40550548361b00e5916bfAnders Carlsson DiagnoseUnusedExprResult(Third); 1357754431107b61a0523df5271c2876a73dd5a051e9Anders Carlsson DiagnoseUnusedExprResult(Body); 1358754431107b61a0523df5271c2876a73dd5a051e9Anders Carlsson 1359625bb569df0c34feec0d52c0ec5215f21ef2e054Dmitri Gribenko if (isa<NullStmt>(Body)) 1360625bb569df0c34feec0d52c0ec5215f21ef2e054Dmitri Gribenko getCurCompoundScope().setHasEmptyLoopBodies(); 1361625bb569df0c34feec0d52c0ec5215f21ef2e054Dmitri Gribenko 1362dfbb02a16ac8c764b5ba1742450513d6212d2f9fNAKAMURA Takumi return Owned(new (Context) ForStmt(Context, First, 1363dfbb02a16ac8c764b5ba1742450513d6212d2f9fNAKAMURA Takumi SecondResult.take(), ConditionVar, 1364dfbb02a16ac8c764b5ba1742450513d6212d2f9fNAKAMURA Takumi Third, Body, ForLoc, LParenLoc, 136543dec6bbde2d0a16c35978983761c8b7030c8e18Douglas Gregor RParenLoc)); 13665f016e2cb5d11daeb237544de1c5d59f20fe1a6eReid Spencer} 13675f016e2cb5d11daeb237544de1c5d59f20fe1a6eReid Spencer 1368f6a1648197562e0b133440d612d9af297d0a86ccJohn McCall/// In an Objective C collection iteration statement: 1369f6a1648197562e0b133440d612d9af297d0a86ccJohn McCall/// for (x in y) 1370f6a1648197562e0b133440d612d9af297d0a86ccJohn McCall/// x can be an arbitrary l-value expression. Bind it up as a 1371f6a1648197562e0b133440d612d9af297d0a86ccJohn McCall/// full-expression. 1372f6a1648197562e0b133440d612d9af297d0a86ccJohn McCallStmtResult Sema::ActOnForEachLValueExpr(Expr *E) { 137329bbd1a33edfd3c81c35d5076530c2867a05bddcJohn McCall // Reduce placeholder expressions here. Note that this rejects the 137429bbd1a33edfd3c81c35d5076530c2867a05bddcJohn McCall // use of pseudo-object l-values in this position. 137529bbd1a33edfd3c81c35d5076530c2867a05bddcJohn McCall ExprResult result = CheckPlaceholderExpr(E); 137629bbd1a33edfd3c81c35d5076530c2867a05bddcJohn McCall if (result.isInvalid()) return StmtError(); 137729bbd1a33edfd3c81c35d5076530c2867a05bddcJohn McCall E = result.take(); 137829bbd1a33edfd3c81c35d5076530c2867a05bddcJohn McCall 1379f6a1648197562e0b133440d612d9af297d0a86ccJohn McCall CheckImplicitConversions(E); 138029bbd1a33edfd3c81c35d5076530c2867a05bddcJohn McCall 138129bbd1a33edfd3c81c35d5076530c2867a05bddcJohn McCall result = MaybeCreateExprWithCleanups(E); 138229bbd1a33edfd3c81c35d5076530c2867a05bddcJohn McCall if (result.isInvalid()) return StmtError(); 138329bbd1a33edfd3c81c35d5076530c2867a05bddcJohn McCall 138429bbd1a33edfd3c81c35d5076530c2867a05bddcJohn McCall return Owned(static_cast<Stmt*>(result.take())); 1385f6a1648197562e0b133440d612d9af297d0a86ccJohn McCall} 1386f6a1648197562e0b133440d612d9af297d0a86ccJohn McCall 1387990567cb60e8530ba01b41d4e056e32b44b95ec0John McCallExprResult 1388990567cb60e8530ba01b41d4e056e32b44b95ec0John McCallSema::ActOnObjCForCollectionOperand(SourceLocation forLoc, Expr *collection) { 1389990567cb60e8530ba01b41d4e056e32b44b95ec0John McCall assert(collection); 1390990567cb60e8530ba01b41d4e056e32b44b95ec0John McCall 1391990567cb60e8530ba01b41d4e056e32b44b95ec0John McCall // Bail out early if we've got a type-dependent expression. 1392990567cb60e8530ba01b41d4e056e32b44b95ec0John McCall if (collection->isTypeDependent()) return Owned(collection); 1393990567cb60e8530ba01b41d4e056e32b44b95ec0John McCall 1394990567cb60e8530ba01b41d4e056e32b44b95ec0John McCall // Perform normal l-value conversion. 1395990567cb60e8530ba01b41d4e056e32b44b95ec0John McCall ExprResult result = DefaultFunctionArrayLvalueConversion(collection); 1396990567cb60e8530ba01b41d4e056e32b44b95ec0John McCall if (result.isInvalid()) 1397990567cb60e8530ba01b41d4e056e32b44b95ec0John McCall return ExprError(); 1398990567cb60e8530ba01b41d4e056e32b44b95ec0John McCall collection = result.take(); 1399990567cb60e8530ba01b41d4e056e32b44b95ec0John McCall 1400990567cb60e8530ba01b41d4e056e32b44b95ec0John McCall // The operand needs to have object-pointer type. 1401990567cb60e8530ba01b41d4e056e32b44b95ec0John McCall // TODO: should we do a contextual conversion? 1402990567cb60e8530ba01b41d4e056e32b44b95ec0John McCall const ObjCObjectPointerType *pointerType = 1403990567cb60e8530ba01b41d4e056e32b44b95ec0John McCall collection->getType()->getAs<ObjCObjectPointerType>(); 1404990567cb60e8530ba01b41d4e056e32b44b95ec0John McCall if (!pointerType) 1405990567cb60e8530ba01b41d4e056e32b44b95ec0John McCall return Diag(forLoc, diag::err_collection_expr_type) 1406990567cb60e8530ba01b41d4e056e32b44b95ec0John McCall << collection->getType() << collection->getSourceRange(); 1407990567cb60e8530ba01b41d4e056e32b44b95ec0John McCall 1408990567cb60e8530ba01b41d4e056e32b44b95ec0John McCall // Check that the operand provides 1409990567cb60e8530ba01b41d4e056e32b44b95ec0John McCall // - countByEnumeratingWithState:objects:count: 1410990567cb60e8530ba01b41d4e056e32b44b95ec0John McCall const ObjCObjectType *objectType = pointerType->getObjectType(); 1411990567cb60e8530ba01b41d4e056e32b44b95ec0John McCall ObjCInterfaceDecl *iface = objectType->getInterface(); 1412990567cb60e8530ba01b41d4e056e32b44b95ec0John McCall 1413990567cb60e8530ba01b41d4e056e32b44b95ec0John McCall // If we have a forward-declared type, we can't do this check. 1414b3029960632ca8a3248e74770eda64d6c16f7246Douglas Gregor // Under ARC, it is an error not to have a forward-declared class. 1415b3029960632ca8a3248e74770eda64d6c16f7246Douglas Gregor if (iface && 1416b3029960632ca8a3248e74770eda64d6c16f7246Douglas Gregor RequireCompleteType(forLoc, QualType(objectType, 0), 14174e4d08403ca5cfd4d558fa2936215d3a4e5a528dDavid Blaikie getLangOpts().ObjCAutoRefCount 1418d10099e5c8238fa0327f03921cf2e3c8975c881eDouglas Gregor ? diag::err_arc_collection_forward 1419d10099e5c8238fa0327f03921cf2e3c8975c881eDouglas Gregor : 0, 1420d10099e5c8238fa0327f03921cf2e3c8975c881eDouglas Gregor collection)) { 1421990567cb60e8530ba01b41d4e056e32b44b95ec0John McCall // Otherwise, if we have any useful type information, check that 1422990567cb60e8530ba01b41d4e056e32b44b95ec0John McCall // the type declares the appropriate method. 1423990567cb60e8530ba01b41d4e056e32b44b95ec0John McCall } else if (iface || !objectType->qual_empty()) { 1424990567cb60e8530ba01b41d4e056e32b44b95ec0John McCall IdentifierInfo *selectorIdents[] = { 1425990567cb60e8530ba01b41d4e056e32b44b95ec0John McCall &Context.Idents.get("countByEnumeratingWithState"), 1426990567cb60e8530ba01b41d4e056e32b44b95ec0John McCall &Context.Idents.get("objects"), 1427990567cb60e8530ba01b41d4e056e32b44b95ec0John McCall &Context.Idents.get("count") 1428990567cb60e8530ba01b41d4e056e32b44b95ec0John McCall }; 1429990567cb60e8530ba01b41d4e056e32b44b95ec0John McCall Selector selector = Context.Selectors.getSelector(3, &selectorIdents[0]); 1430990567cb60e8530ba01b41d4e056e32b44b95ec0John McCall 1431990567cb60e8530ba01b41d4e056e32b44b95ec0John McCall ObjCMethodDecl *method = 0; 1432990567cb60e8530ba01b41d4e056e32b44b95ec0John McCall 1433990567cb60e8530ba01b41d4e056e32b44b95ec0John McCall // If there's an interface, look in both the public and private APIs. 1434990567cb60e8530ba01b41d4e056e32b44b95ec0John McCall if (iface) { 1435990567cb60e8530ba01b41d4e056e32b44b95ec0John McCall method = iface->lookupInstanceMethod(selector); 1436990567cb60e8530ba01b41d4e056e32b44b95ec0John McCall if (!method) method = LookupPrivateInstanceMethod(selector, iface); 1437990567cb60e8530ba01b41d4e056e32b44b95ec0John McCall } 1438990567cb60e8530ba01b41d4e056e32b44b95ec0John McCall 1439990567cb60e8530ba01b41d4e056e32b44b95ec0John McCall // Also check protocol qualifiers. 1440990567cb60e8530ba01b41d4e056e32b44b95ec0John McCall if (!method) 1441990567cb60e8530ba01b41d4e056e32b44b95ec0John McCall method = LookupMethodInQualifiedType(selector, pointerType, 1442990567cb60e8530ba01b41d4e056e32b44b95ec0John McCall /*instance*/ true); 1443990567cb60e8530ba01b41d4e056e32b44b95ec0John McCall 1444990567cb60e8530ba01b41d4e056e32b44b95ec0John McCall // If we didn't find it anywhere, give up. 1445990567cb60e8530ba01b41d4e056e32b44b95ec0John McCall if (!method) { 1446990567cb60e8530ba01b41d4e056e32b44b95ec0John McCall Diag(forLoc, diag::warn_collection_expr_type) 1447990567cb60e8530ba01b41d4e056e32b44b95ec0John McCall << collection->getType() << selector << collection->getSourceRange(); 1448990567cb60e8530ba01b41d4e056e32b44b95ec0John McCall } 1449990567cb60e8530ba01b41d4e056e32b44b95ec0John McCall 1450990567cb60e8530ba01b41d4e056e32b44b95ec0John McCall // TODO: check for an incompatible signature? 1451990567cb60e8530ba01b41d4e056e32b44b95ec0John McCall } 1452990567cb60e8530ba01b41d4e056e32b44b95ec0John McCall 1453990567cb60e8530ba01b41d4e056e32b44b95ec0John McCall // Wrap up any cleanups in the expression. 1454990567cb60e8530ba01b41d4e056e32b44b95ec0John McCall return Owned(MaybeCreateExprWithCleanups(collection)); 1455990567cb60e8530ba01b41d4e056e32b44b95ec0John McCall} 1456990567cb60e8530ba01b41d4e056e32b44b95ec0John McCall 145760d7b3a319d84d688752be3870615ac0f111fb16John McCallStmtResult 1458f05b1520d6f175acbfc3913489f4dfa842875ec4Sebastian RedlSema::ActOnObjCForCollectionStmt(SourceLocation ForLoc, 1459f05b1520d6f175acbfc3913489f4dfa842875ec4Sebastian Redl SourceLocation LParenLoc, 14609ae2f076ca5ab1feb3ba95629099ec2319833701John McCall Stmt *First, Expr *Second, 14619ae2f076ca5ab1feb3ba95629099ec2319833701John McCall SourceLocation RParenLoc, Stmt *Body) { 146220552d2842245692b649e0d25380670922f954a2Fariborz Jahanian if (First) { 146320552d2842245692b649e0d25380670922f954a2Fariborz Jahanian QualType FirstType; 146420552d2842245692b649e0d25380670922f954a2Fariborz Jahanian if (DeclStmt *DS = dyn_cast<DeclStmt>(First)) { 14657e24e82a70a2c681f4291a3397bcd1e1005f251aChris Lattner if (!DS->isSingleDecl()) 1466f05b1520d6f175acbfc3913489f4dfa842875ec4Sebastian Redl return StmtError(Diag((*DS->decl_begin())->getLocation(), 1467f05b1520d6f175acbfc3913489f4dfa842875ec4Sebastian Redl diag::err_toomany_element_decls)); 1468f05b1520d6f175acbfc3913489f4dfa842875ec4Sebastian Redl 1469f85e193739c953358c865005855253af4f68a497John McCall VarDecl *D = cast<VarDecl>(DS->getSingleDecl()); 1470f85e193739c953358c865005855253af4f68a497John McCall FirstType = D->getType(); 1471f3a41af4d5c98a72a1d6720bbbfd658e57ef2541Chris Lattner // C99 6.8.5p3: The declaration part of a 'for' statement shall only 1472f3a41af4d5c98a72a1d6720bbbfd658e57ef2541Chris Lattner // declare identifiers for objects having storage class 'auto' or 1473f3a41af4d5c98a72a1d6720bbbfd658e57ef2541Chris Lattner // 'register'. 1474f85e193739c953358c865005855253af4f68a497John McCall if (!D->hasLocalStorage()) 1475f85e193739c953358c865005855253af4f68a497John McCall return StmtError(Diag(D->getLocation(), 1476f05b1520d6f175acbfc3913489f4dfa842875ec4Sebastian Redl diag::err_non_variable_decl_in_for)); 14771fe379f0fa6fbc0a6057e8966253aea2957ca953Anders Carlsson } else { 1478c3203e7ee1464a096f341c2e2a83a10be2da000aDouglas Gregor Expr *FirstE = cast<Expr>(First); 14797eb0a9eb0cde8444b97f9c5b713d9be7a6f1e607John McCall if (!FirstE->isTypeDependent() && !FirstE->isLValue()) 1480f05b1520d6f175acbfc3913489f4dfa842875ec4Sebastian Redl return StmtError(Diag(First->getLocStart(), 1481f05b1520d6f175acbfc3913489f4dfa842875ec4Sebastian Redl diag::err_selector_element_not_lvalue) 1482f05b1520d6f175acbfc3913489f4dfa842875ec4Sebastian Redl << First->getSourceRange()); 14831fe379f0fa6fbc0a6057e8966253aea2957ca953Anders Carlsson 14841eb4433ac451dc16f4133a88af2d002ac26c58efMike Stump FirstType = static_cast<Expr*>(First)->getType(); 14851fe379f0fa6fbc0a6057e8966253aea2957ca953Anders Carlsson } 1486c3203e7ee1464a096f341c2e2a83a10be2da000aDouglas Gregor if (!FirstType->isDependentType() && 1487c3203e7ee1464a096f341c2e2a83a10be2da000aDouglas Gregor !FirstType->isObjCObjectPointerType() && 1488a5e42a82ce055f29f3733f3a1f10da6cb9877deeFariborz Jahanian !FirstType->isBlockPointerType()) 1489dcd5ef12488e4c7ea844327835896ca86b609a97Chris Lattner Diag(ForLoc, diag::err_selector_element_type) 1490d162584991885ab004a02573a73ce06422b921fcChris Lattner << FirstType << First->getSourceRange(); 14913ba5a0f90a03d5e13d02cbee9abd2a1ba01b18bcFariborz Jahanian } 1492990567cb60e8530ba01b41d4e056e32b44b95ec0John McCall 14938189cde56b4f6f938cd65f53c932fe1860d0204cTed Kremenek return Owned(new (Context) ObjCForCollectionStmt(First, Second, Body, 14948189cde56b4f6f938cd65f53c932fe1860d0204cTed Kremenek ForLoc, RParenLoc)); 14953ba5a0f90a03d5e13d02cbee9abd2a1ba01b18bcFariborz Jahanian} 14965f016e2cb5d11daeb237544de1c5d59f20fe1a6eReid Spencer 1497ad762fcdc16b9e4705b12b09d92b8c026212b906Richard Smithnamespace { 1498ad762fcdc16b9e4705b12b09d92b8c026212b906Richard Smith 1499ad762fcdc16b9e4705b12b09d92b8c026212b906Richard Smithenum BeginEndFunction { 1500ad762fcdc16b9e4705b12b09d92b8c026212b906Richard Smith BEF_begin, 1501ad762fcdc16b9e4705b12b09d92b8c026212b906Richard Smith BEF_end 1502ad762fcdc16b9e4705b12b09d92b8c026212b906Richard Smith}; 1503ad762fcdc16b9e4705b12b09d92b8c026212b906Richard Smith 1504ad762fcdc16b9e4705b12b09d92b8c026212b906Richard Smith/// Build a variable declaration for a for-range statement. 1505ad762fcdc16b9e4705b12b09d92b8c026212b906Richard Smithstatic VarDecl *BuildForRangeVarDecl(Sema &SemaRef, SourceLocation Loc, 1506ad762fcdc16b9e4705b12b09d92b8c026212b906Richard Smith QualType Type, const char *Name) { 1507ad762fcdc16b9e4705b12b09d92b8c026212b906Richard Smith DeclContext *DC = SemaRef.CurContext; 1508ad762fcdc16b9e4705b12b09d92b8c026212b906Richard Smith IdentifierInfo *II = &SemaRef.PP.getIdentifierTable().get(Name); 1509ad762fcdc16b9e4705b12b09d92b8c026212b906Richard Smith TypeSourceInfo *TInfo = SemaRef.Context.getTrivialTypeSourceInfo(Type, Loc); 1510ad762fcdc16b9e4705b12b09d92b8c026212b906Richard Smith VarDecl *Decl = VarDecl::Create(SemaRef.Context, DC, Loc, Loc, II, Type, 1511ad762fcdc16b9e4705b12b09d92b8c026212b906Richard Smith TInfo, SC_Auto, SC_None); 1512b403d6d746239095a2c7bac958c924d92434e2b4Richard Smith Decl->setImplicit(); 1513ad762fcdc16b9e4705b12b09d92b8c026212b906Richard Smith return Decl; 1514ad762fcdc16b9e4705b12b09d92b8c026212b906Richard Smith} 1515ad762fcdc16b9e4705b12b09d92b8c026212b906Richard Smith 1516ad762fcdc16b9e4705b12b09d92b8c026212b906Richard Smith/// Finish building a variable declaration for a for-range statement. 1517ad762fcdc16b9e4705b12b09d92b8c026212b906Richard Smith/// \return true if an error occurs. 1518ad762fcdc16b9e4705b12b09d92b8c026212b906Richard Smithstatic bool FinishForRangeVarDecl(Sema &SemaRef, VarDecl *Decl, Expr *Init, 1519ad762fcdc16b9e4705b12b09d92b8c026212b906Richard Smith SourceLocation Loc, int diag) { 1520ad762fcdc16b9e4705b12b09d92b8c026212b906Richard Smith // Deduce the type for the iterator variable now rather than leaving it to 1521ad762fcdc16b9e4705b12b09d92b8c026212b906Richard Smith // AddInitializerToDecl, so we can produce a more suitable diagnostic. 1522ad762fcdc16b9e4705b12b09d92b8c026212b906Richard Smith TypeSourceInfo *InitTSI = 0; 152362b7cfb73e202051e7ab0dad42ba213acd0dec7eSebastian Redl if ((!isa<InitListExpr>(Init) && Init->getType()->isVoidType()) || 1524b832f6dea893f25b40500a04781286236281cb20Sebastian Redl SemaRef.DeduceAutoType(Decl->getTypeSourceInfo(), Init, InitTSI) == 1525b832f6dea893f25b40500a04781286236281cb20Sebastian Redl Sema::DAR_Failed) 1526ad762fcdc16b9e4705b12b09d92b8c026212b906Richard Smith SemaRef.Diag(Loc, diag) << Init->getType(); 1527ad762fcdc16b9e4705b12b09d92b8c026212b906Richard Smith if (!InitTSI) { 1528ad762fcdc16b9e4705b12b09d92b8c026212b906Richard Smith Decl->setInvalidDecl(); 1529ad762fcdc16b9e4705b12b09d92b8c026212b906Richard Smith return true; 1530ad762fcdc16b9e4705b12b09d92b8c026212b906Richard Smith } 1531ad762fcdc16b9e4705b12b09d92b8c026212b906Richard Smith Decl->setTypeSourceInfo(InitTSI); 1532ad762fcdc16b9e4705b12b09d92b8c026212b906Richard Smith Decl->setType(InitTSI->getType()); 1533ad762fcdc16b9e4705b12b09d92b8c026212b906Richard Smith 1534f85e193739c953358c865005855253af4f68a497John McCall // In ARC, infer lifetime. 1535f85e193739c953358c865005855253af4f68a497John McCall // FIXME: ARC may want to turn this into 'const __unsafe_unretained' if 1536f85e193739c953358c865005855253af4f68a497John McCall // we're doing the equivalent of fast iteration. 15374e4d08403ca5cfd4d558fa2936215d3a4e5a528dDavid Blaikie if (SemaRef.getLangOpts().ObjCAutoRefCount && 1538f85e193739c953358c865005855253af4f68a497John McCall SemaRef.inferObjCARCLifetime(Decl)) 1539f85e193739c953358c865005855253af4f68a497John McCall Decl->setInvalidDecl(); 1540f85e193739c953358c865005855253af4f68a497John McCall 1541ad762fcdc16b9e4705b12b09d92b8c026212b906Richard Smith SemaRef.AddInitializerToDecl(Decl, Init, /*DirectInit=*/false, 1542ad762fcdc16b9e4705b12b09d92b8c026212b906Richard Smith /*TypeMayContainAuto=*/false); 1543ad762fcdc16b9e4705b12b09d92b8c026212b906Richard Smith SemaRef.FinalizeDeclaration(Decl); 1544b403d6d746239095a2c7bac958c924d92434e2b4Richard Smith SemaRef.CurContext->addHiddenDecl(Decl); 1545ad762fcdc16b9e4705b12b09d92b8c026212b906Richard Smith return false; 1546ad762fcdc16b9e4705b12b09d92b8c026212b906Richard Smith} 1547ad762fcdc16b9e4705b12b09d92b8c026212b906Richard Smith 1548ad762fcdc16b9e4705b12b09d92b8c026212b906Richard Smith/// Produce a note indicating which begin/end function was implicitly called 1549ad762fcdc16b9e4705b12b09d92b8c026212b906Richard Smith/// by a C++0x for-range statement. This is often not obvious from the code, 1550ad762fcdc16b9e4705b12b09d92b8c026212b906Richard Smith/// nor from the diagnostics produced when analysing the implicit expressions 1551ad762fcdc16b9e4705b12b09d92b8c026212b906Richard Smith/// required in a for-range statement. 1552ad762fcdc16b9e4705b12b09d92b8c026212b906Richard Smithvoid NoteForRangeBeginEndFunction(Sema &SemaRef, Expr *E, 1553ad762fcdc16b9e4705b12b09d92b8c026212b906Richard Smith BeginEndFunction BEF) { 1554ad762fcdc16b9e4705b12b09d92b8c026212b906Richard Smith CallExpr *CE = dyn_cast<CallExpr>(E); 1555ad762fcdc16b9e4705b12b09d92b8c026212b906Richard Smith if (!CE) 1556ad762fcdc16b9e4705b12b09d92b8c026212b906Richard Smith return; 1557ad762fcdc16b9e4705b12b09d92b8c026212b906Richard Smith FunctionDecl *D = dyn_cast<FunctionDecl>(CE->getCalleeDecl()); 1558ad762fcdc16b9e4705b12b09d92b8c026212b906Richard Smith if (!D) 1559ad762fcdc16b9e4705b12b09d92b8c026212b906Richard Smith return; 1560ad762fcdc16b9e4705b12b09d92b8c026212b906Richard Smith SourceLocation Loc = D->getLocation(); 1561ad762fcdc16b9e4705b12b09d92b8c026212b906Richard Smith 1562ad762fcdc16b9e4705b12b09d92b8c026212b906Richard Smith std::string Description; 1563ad762fcdc16b9e4705b12b09d92b8c026212b906Richard Smith bool IsTemplate = false; 1564ad762fcdc16b9e4705b12b09d92b8c026212b906Richard Smith if (FunctionTemplateDecl *FunTmpl = D->getPrimaryTemplate()) { 1565ad762fcdc16b9e4705b12b09d92b8c026212b906Richard Smith Description = SemaRef.getTemplateArgumentBindingsText( 1566ad762fcdc16b9e4705b12b09d92b8c026212b906Richard Smith FunTmpl->getTemplateParameters(), *D->getTemplateSpecializationArgs()); 1567ad762fcdc16b9e4705b12b09d92b8c026212b906Richard Smith IsTemplate = true; 1568ad762fcdc16b9e4705b12b09d92b8c026212b906Richard Smith } 1569ad762fcdc16b9e4705b12b09d92b8c026212b906Richard Smith 1570ad762fcdc16b9e4705b12b09d92b8c026212b906Richard Smith SemaRef.Diag(Loc, diag::note_for_range_begin_end) 1571ad762fcdc16b9e4705b12b09d92b8c026212b906Richard Smith << BEF << IsTemplate << Description << E->getType(); 1572ad762fcdc16b9e4705b12b09d92b8c026212b906Richard Smith} 1573ad762fcdc16b9e4705b12b09d92b8c026212b906Richard Smith 1574ad762fcdc16b9e4705b12b09d92b8c026212b906Richard Smith/// Build a call to 'begin' or 'end' for a C++0x for-range statement. If the 1575ad762fcdc16b9e4705b12b09d92b8c026212b906Richard Smith/// given LookupResult is non-empty, it is assumed to describe a member which 1576ad762fcdc16b9e4705b12b09d92b8c026212b906Richard Smith/// will be invoked. Otherwise, the function will be found via argument 1577ad762fcdc16b9e4705b12b09d92b8c026212b906Richard Smith/// dependent lookup. 1578ad762fcdc16b9e4705b12b09d92b8c026212b906Richard Smithstatic ExprResult BuildForRangeBeginEndCall(Sema &SemaRef, Scope *S, 1579ad762fcdc16b9e4705b12b09d92b8c026212b906Richard Smith SourceLocation Loc, 1580ad762fcdc16b9e4705b12b09d92b8c026212b906Richard Smith VarDecl *Decl, 1581ad762fcdc16b9e4705b12b09d92b8c026212b906Richard Smith BeginEndFunction BEF, 1582ad762fcdc16b9e4705b12b09d92b8c026212b906Richard Smith const DeclarationNameInfo &NameInfo, 1583ad762fcdc16b9e4705b12b09d92b8c026212b906Richard Smith LookupResult &MemberLookup, 1584ad762fcdc16b9e4705b12b09d92b8c026212b906Richard Smith Expr *Range) { 1585ad762fcdc16b9e4705b12b09d92b8c026212b906Richard Smith ExprResult CallExpr; 1586ad762fcdc16b9e4705b12b09d92b8c026212b906Richard Smith if (!MemberLookup.empty()) { 1587ad762fcdc16b9e4705b12b09d92b8c026212b906Richard Smith ExprResult MemberRef = 1588ad762fcdc16b9e4705b12b09d92b8c026212b906Richard Smith SemaRef.BuildMemberReferenceExpr(Range, Range->getType(), Loc, 1589ad762fcdc16b9e4705b12b09d92b8c026212b906Richard Smith /*IsPtr=*/false, CXXScopeSpec(), 1590e4b92761b43ced611c417ae478568610f1ad7b1eAbramo Bagnara /*TemplateKWLoc=*/SourceLocation(), 1591e4b92761b43ced611c417ae478568610f1ad7b1eAbramo Bagnara /*FirstQualifierInScope=*/0, 1592e4b92761b43ced611c417ae478568610f1ad7b1eAbramo Bagnara MemberLookup, 1593ad762fcdc16b9e4705b12b09d92b8c026212b906Richard Smith /*TemplateArgs=*/0); 1594ad762fcdc16b9e4705b12b09d92b8c026212b906Richard Smith if (MemberRef.isInvalid()) 1595ad762fcdc16b9e4705b12b09d92b8c026212b906Richard Smith return ExprError(); 1596ad762fcdc16b9e4705b12b09d92b8c026212b906Richard Smith CallExpr = SemaRef.ActOnCallExpr(S, MemberRef.get(), Loc, MultiExprArg(), 1597ad762fcdc16b9e4705b12b09d92b8c026212b906Richard Smith Loc, 0); 1598ad762fcdc16b9e4705b12b09d92b8c026212b906Richard Smith if (CallExpr.isInvalid()) 1599ad762fcdc16b9e4705b12b09d92b8c026212b906Richard Smith return ExprError(); 1600ad762fcdc16b9e4705b12b09d92b8c026212b906Richard Smith } else { 1601ad762fcdc16b9e4705b12b09d92b8c026212b906Richard Smith UnresolvedSet<0> FoundNames; 1602ad762fcdc16b9e4705b12b09d92b8c026212b906Richard Smith // C++0x [stmt.ranged]p1: For the purposes of this name lookup, namespace 1603ad762fcdc16b9e4705b12b09d92b8c026212b906Richard Smith // std is an associated namespace. 1604ad762fcdc16b9e4705b12b09d92b8c026212b906Richard Smith UnresolvedLookupExpr *Fn = 1605ad762fcdc16b9e4705b12b09d92b8c026212b906Richard Smith UnresolvedLookupExpr::Create(SemaRef.Context, /*NamingClass=*/0, 1606ad762fcdc16b9e4705b12b09d92b8c026212b906Richard Smith NestedNameSpecifierLoc(), NameInfo, 1607ad762fcdc16b9e4705b12b09d92b8c026212b906Richard Smith /*NeedsADL=*/true, /*Overloaded=*/false, 1608ad762fcdc16b9e4705b12b09d92b8c026212b906Richard Smith FoundNames.begin(), FoundNames.end(), 1609ad762fcdc16b9e4705b12b09d92b8c026212b906Richard Smith /*LookInStdNamespace=*/true); 1610ad762fcdc16b9e4705b12b09d92b8c026212b906Richard Smith CallExpr = SemaRef.BuildOverloadedCallExpr(S, Fn, Fn, Loc, &Range, 1, Loc, 16113943b1c0215da2a4171dd6c696cb75d19e5a04a9Kaelyn Uhrain 0, /*AllowTypoCorrection=*/false); 1612ad762fcdc16b9e4705b12b09d92b8c026212b906Richard Smith if (CallExpr.isInvalid()) { 1613ad762fcdc16b9e4705b12b09d92b8c026212b906Richard Smith SemaRef.Diag(Range->getLocStart(), diag::note_for_range_type) 1614ad762fcdc16b9e4705b12b09d92b8c026212b906Richard Smith << Range->getType(); 1615ad762fcdc16b9e4705b12b09d92b8c026212b906Richard Smith return ExprError(); 1616ad762fcdc16b9e4705b12b09d92b8c026212b906Richard Smith } 1617ad762fcdc16b9e4705b12b09d92b8c026212b906Richard Smith } 1618ad762fcdc16b9e4705b12b09d92b8c026212b906Richard Smith if (FinishForRangeVarDecl(SemaRef, Decl, CallExpr.get(), Loc, 1619ad762fcdc16b9e4705b12b09d92b8c026212b906Richard Smith diag::err_for_range_iter_deduction_failure)) { 1620ad762fcdc16b9e4705b12b09d92b8c026212b906Richard Smith NoteForRangeBeginEndFunction(SemaRef, CallExpr.get(), BEF); 1621ad762fcdc16b9e4705b12b09d92b8c026212b906Richard Smith return ExprError(); 1622ad762fcdc16b9e4705b12b09d92b8c026212b906Richard Smith } 1623ad762fcdc16b9e4705b12b09d92b8c026212b906Richard Smith return CallExpr; 1624ad762fcdc16b9e4705b12b09d92b8c026212b906Richard Smith} 1625ad762fcdc16b9e4705b12b09d92b8c026212b906Richard Smith 1626ad762fcdc16b9e4705b12b09d92b8c026212b906Richard Smith} 1627ad762fcdc16b9e4705b12b09d92b8c026212b906Richard Smith 1628ad762fcdc16b9e4705b12b09d92b8c026212b906Richard Smith/// ActOnCXXForRangeStmt - Check and build a C++0x for-range statement. 1629ad762fcdc16b9e4705b12b09d92b8c026212b906Richard Smith/// 1630ad762fcdc16b9e4705b12b09d92b8c026212b906Richard Smith/// C++0x [stmt.ranged]: 1631ad762fcdc16b9e4705b12b09d92b8c026212b906Richard Smith/// A range-based for statement is equivalent to 1632ad762fcdc16b9e4705b12b09d92b8c026212b906Richard Smith/// 1633ad762fcdc16b9e4705b12b09d92b8c026212b906Richard Smith/// { 1634ad762fcdc16b9e4705b12b09d92b8c026212b906Richard Smith/// auto && __range = range-init; 1635ad762fcdc16b9e4705b12b09d92b8c026212b906Richard Smith/// for ( auto __begin = begin-expr, 1636ad762fcdc16b9e4705b12b09d92b8c026212b906Richard Smith/// __end = end-expr; 1637ad762fcdc16b9e4705b12b09d92b8c026212b906Richard Smith/// __begin != __end; 1638ad762fcdc16b9e4705b12b09d92b8c026212b906Richard Smith/// ++__begin ) { 1639ad762fcdc16b9e4705b12b09d92b8c026212b906Richard Smith/// for-range-declaration = *__begin; 1640ad762fcdc16b9e4705b12b09d92b8c026212b906Richard Smith/// statement 1641ad762fcdc16b9e4705b12b09d92b8c026212b906Richard Smith/// } 1642ad762fcdc16b9e4705b12b09d92b8c026212b906Richard Smith/// } 1643ad762fcdc16b9e4705b12b09d92b8c026212b906Richard Smith/// 1644ad762fcdc16b9e4705b12b09d92b8c026212b906Richard Smith/// The body of the loop is not available yet, since it cannot be analysed until 1645ad762fcdc16b9e4705b12b09d92b8c026212b906Richard Smith/// we have determined the type of the for-range-declaration. 1646ad762fcdc16b9e4705b12b09d92b8c026212b906Richard SmithStmtResult 1647ad762fcdc16b9e4705b12b09d92b8c026212b906Richard SmithSema::ActOnCXXForRangeStmt(SourceLocation ForLoc, SourceLocation LParenLoc, 1648ad762fcdc16b9e4705b12b09d92b8c026212b906Richard Smith Stmt *First, SourceLocation ColonLoc, Expr *Range, 1649ad762fcdc16b9e4705b12b09d92b8c026212b906Richard Smith SourceLocation RParenLoc) { 1650ad762fcdc16b9e4705b12b09d92b8c026212b906Richard Smith if (!First || !Range) 1651ad762fcdc16b9e4705b12b09d92b8c026212b906Richard Smith return StmtError(); 1652ad762fcdc16b9e4705b12b09d92b8c026212b906Richard Smith 1653ad762fcdc16b9e4705b12b09d92b8c026212b906Richard Smith DeclStmt *DS = dyn_cast<DeclStmt>(First); 1654ad762fcdc16b9e4705b12b09d92b8c026212b906Richard Smith assert(DS && "first part of for range not a decl stmt"); 1655ad762fcdc16b9e4705b12b09d92b8c026212b906Richard Smith 1656ad762fcdc16b9e4705b12b09d92b8c026212b906Richard Smith if (!DS->isSingleDecl()) { 1657ad762fcdc16b9e4705b12b09d92b8c026212b906Richard Smith Diag(DS->getStartLoc(), diag::err_type_defined_in_for_range); 1658ad762fcdc16b9e4705b12b09d92b8c026212b906Richard Smith return StmtError(); 1659ad762fcdc16b9e4705b12b09d92b8c026212b906Richard Smith } 1660ad762fcdc16b9e4705b12b09d92b8c026212b906Richard Smith if (DS->getSingleDecl()->isInvalidDecl()) 1661ad762fcdc16b9e4705b12b09d92b8c026212b906Richard Smith return StmtError(); 1662ad762fcdc16b9e4705b12b09d92b8c026212b906Richard Smith 1663ad762fcdc16b9e4705b12b09d92b8c026212b906Richard Smith if (DiagnoseUnexpandedParameterPack(Range, UPPC_Expression)) 1664ad762fcdc16b9e4705b12b09d92b8c026212b906Richard Smith return StmtError(); 1665ad762fcdc16b9e4705b12b09d92b8c026212b906Richard Smith 1666ad762fcdc16b9e4705b12b09d92b8c026212b906Richard Smith // Build auto && __range = range-init 1667ad762fcdc16b9e4705b12b09d92b8c026212b906Richard Smith SourceLocation RangeLoc = Range->getLocStart(); 1668ad762fcdc16b9e4705b12b09d92b8c026212b906Richard Smith VarDecl *RangeVar = BuildForRangeVarDecl(*this, RangeLoc, 1669ad762fcdc16b9e4705b12b09d92b8c026212b906Richard Smith Context.getAutoRRefDeductType(), 1670ad762fcdc16b9e4705b12b09d92b8c026212b906Richard Smith "__range"); 1671ad762fcdc16b9e4705b12b09d92b8c026212b906Richard Smith if (FinishForRangeVarDecl(*this, RangeVar, Range, RangeLoc, 1672ad762fcdc16b9e4705b12b09d92b8c026212b906Richard Smith diag::err_for_range_deduction_failure)) 1673ad762fcdc16b9e4705b12b09d92b8c026212b906Richard Smith return StmtError(); 1674ad762fcdc16b9e4705b12b09d92b8c026212b906Richard Smith 1675ad762fcdc16b9e4705b12b09d92b8c026212b906Richard Smith // Claim the type doesn't contain auto: we've already done the checking. 1676ad762fcdc16b9e4705b12b09d92b8c026212b906Richard Smith DeclGroupPtrTy RangeGroup = 1677ad762fcdc16b9e4705b12b09d92b8c026212b906Richard Smith BuildDeclaratorGroup((Decl**)&RangeVar, 1, /*TypeMayContainAuto=*/false); 1678ad762fcdc16b9e4705b12b09d92b8c026212b906Richard Smith StmtResult RangeDecl = ActOnDeclStmt(RangeGroup, RangeLoc, RangeLoc); 1679ad762fcdc16b9e4705b12b09d92b8c026212b906Richard Smith if (RangeDecl.isInvalid()) 1680ad762fcdc16b9e4705b12b09d92b8c026212b906Richard Smith return StmtError(); 1681ad762fcdc16b9e4705b12b09d92b8c026212b906Richard Smith 1682ad762fcdc16b9e4705b12b09d92b8c026212b906Richard Smith return BuildCXXForRangeStmt(ForLoc, ColonLoc, RangeDecl.get(), 1683ad762fcdc16b9e4705b12b09d92b8c026212b906Richard Smith /*BeginEndDecl=*/0, /*Cond=*/0, /*Inc=*/0, DS, 1684ad762fcdc16b9e4705b12b09d92b8c026212b906Richard Smith RParenLoc); 1685ad762fcdc16b9e4705b12b09d92b8c026212b906Richard Smith} 1686ad762fcdc16b9e4705b12b09d92b8c026212b906Richard Smith 1687ad762fcdc16b9e4705b12b09d92b8c026212b906Richard Smith/// BuildCXXForRangeStmt - Build or instantiate a C++0x for-range statement. 1688ad762fcdc16b9e4705b12b09d92b8c026212b906Richard SmithStmtResult 1689ad762fcdc16b9e4705b12b09d92b8c026212b906Richard SmithSema::BuildCXXForRangeStmt(SourceLocation ForLoc, SourceLocation ColonLoc, 1690ad762fcdc16b9e4705b12b09d92b8c026212b906Richard Smith Stmt *RangeDecl, Stmt *BeginEnd, Expr *Cond, 1691ad762fcdc16b9e4705b12b09d92b8c026212b906Richard Smith Expr *Inc, Stmt *LoopVarDecl, 1692ad762fcdc16b9e4705b12b09d92b8c026212b906Richard Smith SourceLocation RParenLoc) { 1693ad762fcdc16b9e4705b12b09d92b8c026212b906Richard Smith Scope *S = getCurScope(); 1694ad762fcdc16b9e4705b12b09d92b8c026212b906Richard Smith 1695ad762fcdc16b9e4705b12b09d92b8c026212b906Richard Smith DeclStmt *RangeDS = cast<DeclStmt>(RangeDecl); 1696ad762fcdc16b9e4705b12b09d92b8c026212b906Richard Smith VarDecl *RangeVar = cast<VarDecl>(RangeDS->getSingleDecl()); 1697ad762fcdc16b9e4705b12b09d92b8c026212b906Richard Smith QualType RangeVarType = RangeVar->getType(); 1698ad762fcdc16b9e4705b12b09d92b8c026212b906Richard Smith 1699ad762fcdc16b9e4705b12b09d92b8c026212b906Richard Smith DeclStmt *LoopVarDS = cast<DeclStmt>(LoopVarDecl); 1700ad762fcdc16b9e4705b12b09d92b8c026212b906Richard Smith VarDecl *LoopVar = cast<VarDecl>(LoopVarDS->getSingleDecl()); 1701ad762fcdc16b9e4705b12b09d92b8c026212b906Richard Smith 1702ad762fcdc16b9e4705b12b09d92b8c026212b906Richard Smith StmtResult BeginEndDecl = BeginEnd; 1703ad762fcdc16b9e4705b12b09d92b8c026212b906Richard Smith ExprResult NotEqExpr = Cond, IncrExpr = Inc; 1704ad762fcdc16b9e4705b12b09d92b8c026212b906Richard Smith 1705ad762fcdc16b9e4705b12b09d92b8c026212b906Richard Smith if (!BeginEndDecl.get() && !RangeVarType->isDependentType()) { 1706ad762fcdc16b9e4705b12b09d92b8c026212b906Richard Smith SourceLocation RangeLoc = RangeVar->getLocation(); 1707ad762fcdc16b9e4705b12b09d92b8c026212b906Richard Smith 1708e50b01531afcb4afc40d27720afa09613ddcdfa2Ted Kremenek const QualType RangeVarNonRefType = RangeVarType.getNonReferenceType(); 1709e50b01531afcb4afc40d27720afa09613ddcdfa2Ted Kremenek 1710e50b01531afcb4afc40d27720afa09613ddcdfa2Ted Kremenek ExprResult BeginRangeRef = BuildDeclRefExpr(RangeVar, RangeVarNonRefType, 1711e50b01531afcb4afc40d27720afa09613ddcdfa2Ted Kremenek VK_LValue, ColonLoc); 1712e50b01531afcb4afc40d27720afa09613ddcdfa2Ted Kremenek if (BeginRangeRef.isInvalid()) 1713e50b01531afcb4afc40d27720afa09613ddcdfa2Ted Kremenek return StmtError(); 1714e50b01531afcb4afc40d27720afa09613ddcdfa2Ted Kremenek 1715e50b01531afcb4afc40d27720afa09613ddcdfa2Ted Kremenek ExprResult EndRangeRef = BuildDeclRefExpr(RangeVar, RangeVarNonRefType, 1716e50b01531afcb4afc40d27720afa09613ddcdfa2Ted Kremenek VK_LValue, ColonLoc); 1717e50b01531afcb4afc40d27720afa09613ddcdfa2Ted Kremenek if (EndRangeRef.isInvalid()) 1718ad762fcdc16b9e4705b12b09d92b8c026212b906Richard Smith return StmtError(); 1719ad762fcdc16b9e4705b12b09d92b8c026212b906Richard Smith 1720ad762fcdc16b9e4705b12b09d92b8c026212b906Richard Smith QualType AutoType = Context.getAutoDeductType(); 1721ad762fcdc16b9e4705b12b09d92b8c026212b906Richard Smith Expr *Range = RangeVar->getInit(); 1722ad762fcdc16b9e4705b12b09d92b8c026212b906Richard Smith if (!Range) 1723ad762fcdc16b9e4705b12b09d92b8c026212b906Richard Smith return StmtError(); 1724ad762fcdc16b9e4705b12b09d92b8c026212b906Richard Smith QualType RangeType = Range->getType(); 1725ad762fcdc16b9e4705b12b09d92b8c026212b906Richard Smith 1726ad762fcdc16b9e4705b12b09d92b8c026212b906Richard Smith if (RequireCompleteType(RangeLoc, RangeType, 1727d10099e5c8238fa0327f03921cf2e3c8975c881eDouglas Gregor diag::err_for_range_incomplete_type)) 1728ad762fcdc16b9e4705b12b09d92b8c026212b906Richard Smith return StmtError(); 1729ad762fcdc16b9e4705b12b09d92b8c026212b906Richard Smith 1730ad762fcdc16b9e4705b12b09d92b8c026212b906Richard Smith // Build auto __begin = begin-expr, __end = end-expr. 1731ad762fcdc16b9e4705b12b09d92b8c026212b906Richard Smith VarDecl *BeginVar = BuildForRangeVarDecl(*this, ColonLoc, AutoType, 1732ad762fcdc16b9e4705b12b09d92b8c026212b906Richard Smith "__begin"); 1733ad762fcdc16b9e4705b12b09d92b8c026212b906Richard Smith VarDecl *EndVar = BuildForRangeVarDecl(*this, ColonLoc, AutoType, 1734ad762fcdc16b9e4705b12b09d92b8c026212b906Richard Smith "__end"); 1735ad762fcdc16b9e4705b12b09d92b8c026212b906Richard Smith 1736ad762fcdc16b9e4705b12b09d92b8c026212b906Richard Smith // Build begin-expr and end-expr and attach to __begin and __end variables. 1737ad762fcdc16b9e4705b12b09d92b8c026212b906Richard Smith ExprResult BeginExpr, EndExpr; 1738ad762fcdc16b9e4705b12b09d92b8c026212b906Richard Smith if (const ArrayType *UnqAT = RangeType->getAsArrayTypeUnsafe()) { 1739ad762fcdc16b9e4705b12b09d92b8c026212b906Richard Smith // - if _RangeT is an array type, begin-expr and end-expr are __range and 1740ad762fcdc16b9e4705b12b09d92b8c026212b906Richard Smith // __range + __bound, respectively, where __bound is the array bound. If 1741ad762fcdc16b9e4705b12b09d92b8c026212b906Richard Smith // _RangeT is an array of unknown size or an array of incomplete type, 1742ad762fcdc16b9e4705b12b09d92b8c026212b906Richard Smith // the program is ill-formed; 1743ad762fcdc16b9e4705b12b09d92b8c026212b906Richard Smith 1744ad762fcdc16b9e4705b12b09d92b8c026212b906Richard Smith // begin-expr is __range. 1745e50b01531afcb4afc40d27720afa09613ddcdfa2Ted Kremenek BeginExpr = BeginRangeRef; 1746e50b01531afcb4afc40d27720afa09613ddcdfa2Ted Kremenek if (FinishForRangeVarDecl(*this, BeginVar, BeginRangeRef.get(), ColonLoc, 1747ad762fcdc16b9e4705b12b09d92b8c026212b906Richard Smith diag::err_for_range_iter_deduction_failure)) { 1748ad762fcdc16b9e4705b12b09d92b8c026212b906Richard Smith NoteForRangeBeginEndFunction(*this, BeginExpr.get(), BEF_begin); 1749ad762fcdc16b9e4705b12b09d92b8c026212b906Richard Smith return StmtError(); 1750ad762fcdc16b9e4705b12b09d92b8c026212b906Richard Smith } 1751ad762fcdc16b9e4705b12b09d92b8c026212b906Richard Smith 1752ad762fcdc16b9e4705b12b09d92b8c026212b906Richard Smith // Find the array bound. 1753ad762fcdc16b9e4705b12b09d92b8c026212b906Richard Smith ExprResult BoundExpr; 1754ad762fcdc16b9e4705b12b09d92b8c026212b906Richard Smith if (const ConstantArrayType *CAT = dyn_cast<ConstantArrayType>(UnqAT)) 1755ad762fcdc16b9e4705b12b09d92b8c026212b906Richard Smith BoundExpr = Owned(IntegerLiteral::Create(Context, CAT->getSize(), 17561dd986dff9ddfbec687975700770bb377988e9edRichard Trieu Context.getPointerDiffType(), 17571dd986dff9ddfbec687975700770bb377988e9edRichard Trieu RangeLoc)); 1758ad762fcdc16b9e4705b12b09d92b8c026212b906Richard Smith else if (const VariableArrayType *VAT = 1759ad762fcdc16b9e4705b12b09d92b8c026212b906Richard Smith dyn_cast<VariableArrayType>(UnqAT)) 1760ad762fcdc16b9e4705b12b09d92b8c026212b906Richard Smith BoundExpr = VAT->getSizeExpr(); 1761ad762fcdc16b9e4705b12b09d92b8c026212b906Richard Smith else { 1762ad762fcdc16b9e4705b12b09d92b8c026212b906Richard Smith // Can't be a DependentSizedArrayType or an IncompleteArrayType since 1763ad762fcdc16b9e4705b12b09d92b8c026212b906Richard Smith // UnqAT is not incomplete and Range is not type-dependent. 1764b219cfc4d75f0a03630b7c4509ef791b7e97b2c8David Blaikie llvm_unreachable("Unexpected array type in for-range"); 1765ad762fcdc16b9e4705b12b09d92b8c026212b906Richard Smith } 1766ad762fcdc16b9e4705b12b09d92b8c026212b906Richard Smith 1767ad762fcdc16b9e4705b12b09d92b8c026212b906Richard Smith // end-expr is __range + __bound. 1768e50b01531afcb4afc40d27720afa09613ddcdfa2Ted Kremenek EndExpr = ActOnBinOp(S, ColonLoc, tok::plus, EndRangeRef.get(), 1769ad762fcdc16b9e4705b12b09d92b8c026212b906Richard Smith BoundExpr.get()); 1770ad762fcdc16b9e4705b12b09d92b8c026212b906Richard Smith if (EndExpr.isInvalid()) 1771ad762fcdc16b9e4705b12b09d92b8c026212b906Richard Smith return StmtError(); 1772ad762fcdc16b9e4705b12b09d92b8c026212b906Richard Smith if (FinishForRangeVarDecl(*this, EndVar, EndExpr.get(), ColonLoc, 1773ad762fcdc16b9e4705b12b09d92b8c026212b906Richard Smith diag::err_for_range_iter_deduction_failure)) { 1774ad762fcdc16b9e4705b12b09d92b8c026212b906Richard Smith NoteForRangeBeginEndFunction(*this, EndExpr.get(), BEF_end); 1775ad762fcdc16b9e4705b12b09d92b8c026212b906Richard Smith return StmtError(); 1776ad762fcdc16b9e4705b12b09d92b8c026212b906Richard Smith } 1777ad762fcdc16b9e4705b12b09d92b8c026212b906Richard Smith } else { 1778ad762fcdc16b9e4705b12b09d92b8c026212b906Richard Smith DeclarationNameInfo BeginNameInfo(&PP.getIdentifierTable().get("begin"), 1779ad762fcdc16b9e4705b12b09d92b8c026212b906Richard Smith ColonLoc); 1780ad762fcdc16b9e4705b12b09d92b8c026212b906Richard Smith DeclarationNameInfo EndNameInfo(&PP.getIdentifierTable().get("end"), 1781ad762fcdc16b9e4705b12b09d92b8c026212b906Richard Smith ColonLoc); 1782ad762fcdc16b9e4705b12b09d92b8c026212b906Richard Smith 1783ad762fcdc16b9e4705b12b09d92b8c026212b906Richard Smith LookupResult BeginMemberLookup(*this, BeginNameInfo, LookupMemberName); 1784ad762fcdc16b9e4705b12b09d92b8c026212b906Richard Smith LookupResult EndMemberLookup(*this, EndNameInfo, LookupMemberName); 1785ad762fcdc16b9e4705b12b09d92b8c026212b906Richard Smith 1786ad762fcdc16b9e4705b12b09d92b8c026212b906Richard Smith if (CXXRecordDecl *D = RangeType->getAsCXXRecordDecl()) { 1787ad762fcdc16b9e4705b12b09d92b8c026212b906Richard Smith // - if _RangeT is a class type, the unqualified-ids begin and end are 1788ad762fcdc16b9e4705b12b09d92b8c026212b906Richard Smith // looked up in the scope of class _RangeT as if by class member access 1789ad762fcdc16b9e4705b12b09d92b8c026212b906Richard Smith // lookup (3.4.5), and if either (or both) finds at least one 1790ad762fcdc16b9e4705b12b09d92b8c026212b906Richard Smith // declaration, begin-expr and end-expr are __range.begin() and 1791ad762fcdc16b9e4705b12b09d92b8c026212b906Richard Smith // __range.end(), respectively; 1792ad762fcdc16b9e4705b12b09d92b8c026212b906Richard Smith LookupQualifiedName(BeginMemberLookup, D); 1793ad762fcdc16b9e4705b12b09d92b8c026212b906Richard Smith LookupQualifiedName(EndMemberLookup, D); 1794ad762fcdc16b9e4705b12b09d92b8c026212b906Richard Smith 1795ad762fcdc16b9e4705b12b09d92b8c026212b906Richard Smith if (BeginMemberLookup.empty() != EndMemberLookup.empty()) { 1796ad762fcdc16b9e4705b12b09d92b8c026212b906Richard Smith Diag(ColonLoc, diag::err_for_range_member_begin_end_mismatch) 1797ad762fcdc16b9e4705b12b09d92b8c026212b906Richard Smith << RangeType << BeginMemberLookup.empty(); 1798ad762fcdc16b9e4705b12b09d92b8c026212b906Richard Smith return StmtError(); 1799ad762fcdc16b9e4705b12b09d92b8c026212b906Richard Smith } 1800ad762fcdc16b9e4705b12b09d92b8c026212b906Richard Smith } else { 1801ad762fcdc16b9e4705b12b09d92b8c026212b906Richard Smith // - otherwise, begin-expr and end-expr are begin(__range) and 1802ad762fcdc16b9e4705b12b09d92b8c026212b906Richard Smith // end(__range), respectively, where begin and end are looked up with 1803ad762fcdc16b9e4705b12b09d92b8c026212b906Richard Smith // argument-dependent lookup (3.4.2). For the purposes of this name 1804ad762fcdc16b9e4705b12b09d92b8c026212b906Richard Smith // lookup, namespace std is an associated namespace. 1805ad762fcdc16b9e4705b12b09d92b8c026212b906Richard Smith } 1806ad762fcdc16b9e4705b12b09d92b8c026212b906Richard Smith 1807ad762fcdc16b9e4705b12b09d92b8c026212b906Richard Smith BeginExpr = BuildForRangeBeginEndCall(*this, S, ColonLoc, BeginVar, 1808ad762fcdc16b9e4705b12b09d92b8c026212b906Richard Smith BEF_begin, BeginNameInfo, 1809e50b01531afcb4afc40d27720afa09613ddcdfa2Ted Kremenek BeginMemberLookup, 1810e50b01531afcb4afc40d27720afa09613ddcdfa2Ted Kremenek BeginRangeRef.get()); 1811ad762fcdc16b9e4705b12b09d92b8c026212b906Richard Smith if (BeginExpr.isInvalid()) 1812ad762fcdc16b9e4705b12b09d92b8c026212b906Richard Smith return StmtError(); 1813ad762fcdc16b9e4705b12b09d92b8c026212b906Richard Smith 1814ad762fcdc16b9e4705b12b09d92b8c026212b906Richard Smith EndExpr = BuildForRangeBeginEndCall(*this, S, ColonLoc, EndVar, 1815ad762fcdc16b9e4705b12b09d92b8c026212b906Richard Smith BEF_end, EndNameInfo, 1816e50b01531afcb4afc40d27720afa09613ddcdfa2Ted Kremenek EndMemberLookup, EndRangeRef.get()); 1817ad762fcdc16b9e4705b12b09d92b8c026212b906Richard Smith if (EndExpr.isInvalid()) 1818ad762fcdc16b9e4705b12b09d92b8c026212b906Richard Smith return StmtError(); 1819ad762fcdc16b9e4705b12b09d92b8c026212b906Richard Smith } 1820ad762fcdc16b9e4705b12b09d92b8c026212b906Richard Smith 1821ad762fcdc16b9e4705b12b09d92b8c026212b906Richard Smith // C++0x [decl.spec.auto]p6: BeginType and EndType must be the same. 1822ad762fcdc16b9e4705b12b09d92b8c026212b906Richard Smith QualType BeginType = BeginVar->getType(), EndType = EndVar->getType(); 1823ad762fcdc16b9e4705b12b09d92b8c026212b906Richard Smith if (!Context.hasSameType(BeginType, EndType)) { 1824ad762fcdc16b9e4705b12b09d92b8c026212b906Richard Smith Diag(RangeLoc, diag::err_for_range_begin_end_types_differ) 1825ad762fcdc16b9e4705b12b09d92b8c026212b906Richard Smith << BeginType << EndType; 1826ad762fcdc16b9e4705b12b09d92b8c026212b906Richard Smith NoteForRangeBeginEndFunction(*this, BeginExpr.get(), BEF_begin); 1827ad762fcdc16b9e4705b12b09d92b8c026212b906Richard Smith NoteForRangeBeginEndFunction(*this, EndExpr.get(), BEF_end); 1828ad762fcdc16b9e4705b12b09d92b8c026212b906Richard Smith } 1829ad762fcdc16b9e4705b12b09d92b8c026212b906Richard Smith 1830ad762fcdc16b9e4705b12b09d92b8c026212b906Richard Smith Decl *BeginEndDecls[] = { BeginVar, EndVar }; 1831ad762fcdc16b9e4705b12b09d92b8c026212b906Richard Smith // Claim the type doesn't contain auto: we've already done the checking. 1832ad762fcdc16b9e4705b12b09d92b8c026212b906Richard Smith DeclGroupPtrTy BeginEndGroup = 1833ad762fcdc16b9e4705b12b09d92b8c026212b906Richard Smith BuildDeclaratorGroup(BeginEndDecls, 2, /*TypeMayContainAuto=*/false); 1834ad762fcdc16b9e4705b12b09d92b8c026212b906Richard Smith BeginEndDecl = ActOnDeclStmt(BeginEndGroup, ColonLoc, ColonLoc); 1835ad762fcdc16b9e4705b12b09d92b8c026212b906Richard Smith 1836e50b01531afcb4afc40d27720afa09613ddcdfa2Ted Kremenek const QualType BeginRefNonRefType = BeginType.getNonReferenceType(); 1837e50b01531afcb4afc40d27720afa09613ddcdfa2Ted Kremenek ExprResult BeginRef = BuildDeclRefExpr(BeginVar, BeginRefNonRefType, 1838ad762fcdc16b9e4705b12b09d92b8c026212b906Richard Smith VK_LValue, ColonLoc); 1839e50b01531afcb4afc40d27720afa09613ddcdfa2Ted Kremenek if (BeginRef.isInvalid()) 1840e50b01531afcb4afc40d27720afa09613ddcdfa2Ted Kremenek return StmtError(); 1841e50b01531afcb4afc40d27720afa09613ddcdfa2Ted Kremenek 1842ad762fcdc16b9e4705b12b09d92b8c026212b906Richard Smith ExprResult EndRef = BuildDeclRefExpr(EndVar, EndType.getNonReferenceType(), 1843ad762fcdc16b9e4705b12b09d92b8c026212b906Richard Smith VK_LValue, ColonLoc); 1844e50b01531afcb4afc40d27720afa09613ddcdfa2Ted Kremenek if (EndRef.isInvalid()) 1845e50b01531afcb4afc40d27720afa09613ddcdfa2Ted Kremenek return StmtError(); 1846ad762fcdc16b9e4705b12b09d92b8c026212b906Richard Smith 1847ad762fcdc16b9e4705b12b09d92b8c026212b906Richard Smith // Build and check __begin != __end expression. 1848ad762fcdc16b9e4705b12b09d92b8c026212b906Richard Smith NotEqExpr = ActOnBinOp(S, ColonLoc, tok::exclaimequal, 1849ad762fcdc16b9e4705b12b09d92b8c026212b906Richard Smith BeginRef.get(), EndRef.get()); 1850ad762fcdc16b9e4705b12b09d92b8c026212b906Richard Smith NotEqExpr = ActOnBooleanCondition(S, ColonLoc, NotEqExpr.get()); 1851ad762fcdc16b9e4705b12b09d92b8c026212b906Richard Smith NotEqExpr = ActOnFinishFullExpr(NotEqExpr.get()); 1852ad762fcdc16b9e4705b12b09d92b8c026212b906Richard Smith if (NotEqExpr.isInvalid()) { 1853ad762fcdc16b9e4705b12b09d92b8c026212b906Richard Smith NoteForRangeBeginEndFunction(*this, BeginExpr.get(), BEF_begin); 1854ad762fcdc16b9e4705b12b09d92b8c026212b906Richard Smith if (!Context.hasSameType(BeginType, EndType)) 1855ad762fcdc16b9e4705b12b09d92b8c026212b906Richard Smith NoteForRangeBeginEndFunction(*this, EndExpr.get(), BEF_end); 1856ad762fcdc16b9e4705b12b09d92b8c026212b906Richard Smith return StmtError(); 1857ad762fcdc16b9e4705b12b09d92b8c026212b906Richard Smith } 1858ad762fcdc16b9e4705b12b09d92b8c026212b906Richard Smith 1859ad762fcdc16b9e4705b12b09d92b8c026212b906Richard Smith // Build and check ++__begin expression. 1860e50b01531afcb4afc40d27720afa09613ddcdfa2Ted Kremenek BeginRef = BuildDeclRefExpr(BeginVar, BeginRefNonRefType, 1861e50b01531afcb4afc40d27720afa09613ddcdfa2Ted Kremenek VK_LValue, ColonLoc); 1862e50b01531afcb4afc40d27720afa09613ddcdfa2Ted Kremenek if (BeginRef.isInvalid()) 1863e50b01531afcb4afc40d27720afa09613ddcdfa2Ted Kremenek return StmtError(); 1864e50b01531afcb4afc40d27720afa09613ddcdfa2Ted Kremenek 1865ad762fcdc16b9e4705b12b09d92b8c026212b906Richard Smith IncrExpr = ActOnUnaryOp(S, ColonLoc, tok::plusplus, BeginRef.get()); 1866ad762fcdc16b9e4705b12b09d92b8c026212b906Richard Smith IncrExpr = ActOnFinishFullExpr(IncrExpr.get()); 1867ad762fcdc16b9e4705b12b09d92b8c026212b906Richard Smith if (IncrExpr.isInvalid()) { 1868ad762fcdc16b9e4705b12b09d92b8c026212b906Richard Smith NoteForRangeBeginEndFunction(*this, BeginExpr.get(), BEF_begin); 1869ad762fcdc16b9e4705b12b09d92b8c026212b906Richard Smith return StmtError(); 1870ad762fcdc16b9e4705b12b09d92b8c026212b906Richard Smith } 1871ad762fcdc16b9e4705b12b09d92b8c026212b906Richard Smith 1872ad762fcdc16b9e4705b12b09d92b8c026212b906Richard Smith // Build and check *__begin expression. 1873e50b01531afcb4afc40d27720afa09613ddcdfa2Ted Kremenek BeginRef = BuildDeclRefExpr(BeginVar, BeginRefNonRefType, 1874e50b01531afcb4afc40d27720afa09613ddcdfa2Ted Kremenek VK_LValue, ColonLoc); 1875e50b01531afcb4afc40d27720afa09613ddcdfa2Ted Kremenek if (BeginRef.isInvalid()) 1876e50b01531afcb4afc40d27720afa09613ddcdfa2Ted Kremenek return StmtError(); 1877e50b01531afcb4afc40d27720afa09613ddcdfa2Ted Kremenek 1878ad762fcdc16b9e4705b12b09d92b8c026212b906Richard Smith ExprResult DerefExpr = ActOnUnaryOp(S, ColonLoc, tok::star, BeginRef.get()); 1879ad762fcdc16b9e4705b12b09d92b8c026212b906Richard Smith if (DerefExpr.isInvalid()) { 1880ad762fcdc16b9e4705b12b09d92b8c026212b906Richard Smith NoteForRangeBeginEndFunction(*this, BeginExpr.get(), BEF_begin); 1881ad762fcdc16b9e4705b12b09d92b8c026212b906Richard Smith return StmtError(); 1882ad762fcdc16b9e4705b12b09d92b8c026212b906Richard Smith } 1883ad762fcdc16b9e4705b12b09d92b8c026212b906Richard Smith 1884ad762fcdc16b9e4705b12b09d92b8c026212b906Richard Smith // Attach *__begin as initializer for VD. 1885ad762fcdc16b9e4705b12b09d92b8c026212b906Richard Smith if (!LoopVar->isInvalidDecl()) { 1886ad762fcdc16b9e4705b12b09d92b8c026212b906Richard Smith AddInitializerToDecl(LoopVar, DerefExpr.get(), /*DirectInit=*/false, 1887ad762fcdc16b9e4705b12b09d92b8c026212b906Richard Smith /*TypeMayContainAuto=*/true); 1888ad762fcdc16b9e4705b12b09d92b8c026212b906Richard Smith if (LoopVar->isInvalidDecl()) 1889ad762fcdc16b9e4705b12b09d92b8c026212b906Richard Smith NoteForRangeBeginEndFunction(*this, BeginExpr.get(), BEF_begin); 1890ad762fcdc16b9e4705b12b09d92b8c026212b906Richard Smith } 1891cd6f36693ed40cef8c8639c04438d865187c1f73Richard Smith } else { 1892cd6f36693ed40cef8c8639c04438d865187c1f73Richard Smith // The range is implicitly used as a placeholder when it is dependent. 1893cd6f36693ed40cef8c8639c04438d865187c1f73Richard Smith RangeVar->setUsed(); 1894ad762fcdc16b9e4705b12b09d92b8c026212b906Richard Smith } 1895ad762fcdc16b9e4705b12b09d92b8c026212b906Richard Smith 1896ad762fcdc16b9e4705b12b09d92b8c026212b906Richard Smith return Owned(new (Context) CXXForRangeStmt(RangeDS, 1897ad762fcdc16b9e4705b12b09d92b8c026212b906Richard Smith cast_or_null<DeclStmt>(BeginEndDecl.get()), 1898ad762fcdc16b9e4705b12b09d92b8c026212b906Richard Smith NotEqExpr.take(), IncrExpr.take(), 1899ad762fcdc16b9e4705b12b09d92b8c026212b906Richard Smith LoopVarDS, /*Body=*/0, ForLoc, 1900ad762fcdc16b9e4705b12b09d92b8c026212b906Richard Smith ColonLoc, RParenLoc)); 1901ad762fcdc16b9e4705b12b09d92b8c026212b906Richard Smith} 1902ad762fcdc16b9e4705b12b09d92b8c026212b906Richard Smith 1903ad762fcdc16b9e4705b12b09d92b8c026212b906Richard Smith/// FinishCXXForRangeStmt - Attach the body to a C++0x for-range statement. 1904ad762fcdc16b9e4705b12b09d92b8c026212b906Richard Smith/// This is a separate step from ActOnCXXForRangeStmt because analysis of the 1905ad762fcdc16b9e4705b12b09d92b8c026212b906Richard Smith/// body cannot be performed until after the type of the range variable is 1906ad762fcdc16b9e4705b12b09d92b8c026212b906Richard Smith/// determined. 1907ad762fcdc16b9e4705b12b09d92b8c026212b906Richard SmithStmtResult Sema::FinishCXXForRangeStmt(Stmt *S, Stmt *B) { 1908ad762fcdc16b9e4705b12b09d92b8c026212b906Richard Smith if (!S || !B) 1909ad762fcdc16b9e4705b12b09d92b8c026212b906Richard Smith return StmtError(); 1910ad762fcdc16b9e4705b12b09d92b8c026212b906Richard Smith 1911625bb569df0c34feec0d52c0ec5215f21ef2e054Dmitri Gribenko CXXForRangeStmt *ForStmt = cast<CXXForRangeStmt>(S); 1912625bb569df0c34feec0d52c0ec5215f21ef2e054Dmitri Gribenko ForStmt->setBody(B); 1913625bb569df0c34feec0d52c0ec5215f21ef2e054Dmitri Gribenko 1914625bb569df0c34feec0d52c0ec5215f21ef2e054Dmitri Gribenko DiagnoseEmptyStmtBody(ForStmt->getRParenLoc(), B, 1915625bb569df0c34feec0d52c0ec5215f21ef2e054Dmitri Gribenko diag::warn_empty_range_based_for_body); 1916625bb569df0c34feec0d52c0ec5215f21ef2e054Dmitri Gribenko 1917ad762fcdc16b9e4705b12b09d92b8c026212b906Richard Smith return S; 1918ad762fcdc16b9e4705b12b09d92b8c026212b906Richard Smith} 1919ad762fcdc16b9e4705b12b09d92b8c026212b906Richard Smith 192057ad37823e198f977cac605dbfbaefb4daf325e9Chris LattnerStmtResult Sema::ActOnGotoStmt(SourceLocation GotoLoc, 192157ad37823e198f977cac605dbfbaefb4daf325e9Chris Lattner SourceLocation LabelLoc, 192257ad37823e198f977cac605dbfbaefb4daf325e9Chris Lattner LabelDecl *TheDecl) { 192357ad37823e198f977cac605dbfbaefb4daf325e9Chris Lattner getCurFunction()->setHasBranchIntoScope(); 1924ad8dcf4a9df0e24051dc31bf9e6f3cd138a34298Chris Lattner TheDecl->setUsed(); 1925ad8dcf4a9df0e24051dc31bf9e6f3cd138a34298Chris Lattner return Owned(new (Context) GotoStmt(TheDecl, GotoLoc, LabelLoc)); 19265f016e2cb5d11daeb237544de1c5d59f20fe1a6eReid Spencer} 19275f016e2cb5d11daeb237544de1c5d59f20fe1a6eReid Spencer 192860d7b3a319d84d688752be3870615ac0f111fb16John McCallStmtResult 1929ad56d684259f706b7c0ae5ad9c23adb4f2926817Chris LattnerSema::ActOnIndirectGotoStmt(SourceLocation GotoLoc, SourceLocation StarLoc, 19309ae2f076ca5ab1feb3ba95629099ec2319833701John McCall Expr *E) { 1931bbf462314b1dc8e422b7c4dd4cac47e566aedf6dEli Friedman // Convert operand to void* 19325f1b9e689fa5c101512aef99225f2afea1673449Douglas Gregor if (!E->isTypeDependent()) { 19335f1b9e689fa5c101512aef99225f2afea1673449Douglas Gregor QualType ETy = E->getType(); 19342877998bd8db2fac1c56430a4edcfa0ce138aff9Chandler Carruth QualType DestTy = Context.getPointerType(Context.VoidTy.withConst()); 1935429bb276991ff2dbc7c5b438828b9b7737cb15ebJohn Wiegley ExprResult ExprRes = Owned(E); 19365f1b9e689fa5c101512aef99225f2afea1673449Douglas Gregor AssignConvertType ConvTy = 1937429bb276991ff2dbc7c5b438828b9b7737cb15ebJohn Wiegley CheckSingleAssignmentConstraints(DestTy, ExprRes); 1938429bb276991ff2dbc7c5b438828b9b7737cb15ebJohn Wiegley if (ExprRes.isInvalid()) 1939429bb276991ff2dbc7c5b438828b9b7737cb15ebJohn Wiegley return StmtError(); 1940429bb276991ff2dbc7c5b438828b9b7737cb15ebJohn Wiegley E = ExprRes.take(); 19412877998bd8db2fac1c56430a4edcfa0ce138aff9Chandler Carruth if (DiagnoseAssignmentResult(ConvTy, StarLoc, DestTy, ETy, E, AA_Passing)) 19425f1b9e689fa5c101512aef99225f2afea1673449Douglas Gregor return StmtError(); 1943d29975fd08713eb9d1777e60536addaa62df8995Eli Friedman E = MaybeCreateExprWithCleanups(E); 19445f1b9e689fa5c101512aef99225f2afea1673449Douglas Gregor } 1945b60a77e453d32db0ab1914d28e175c2defc0eb65John McCall 1946781472fe99a120098c631b0cbe33c89f8cef5e70John McCall getCurFunction()->setHasIndirectGoto(); 1947b60a77e453d32db0ab1914d28e175c2defc0eb65John McCall 19485f1b9e689fa5c101512aef99225f2afea1673449Douglas Gregor return Owned(new (Context) IndirectGotoStmt(GotoLoc, StarLoc, E)); 19495f016e2cb5d11daeb237544de1c5d59f20fe1a6eReid Spencer} 19505f016e2cb5d11daeb237544de1c5d59f20fe1a6eReid Spencer 195160d7b3a319d84d688752be3870615ac0f111fb16John McCallStmtResult 19521b273c403734d343d720acb28f04011807c8aa56Steve NaroffSema::ActOnContinueStmt(SourceLocation ContinueLoc, Scope *CurScope) { 19535f016e2cb5d11daeb237544de1c5d59f20fe1a6eReid Spencer Scope *S = CurScope->getContinueParent(); 19545f016e2cb5d11daeb237544de1c5d59f20fe1a6eReid Spencer if (!S) { 19555f016e2cb5d11daeb237544de1c5d59f20fe1a6eReid Spencer // C99 6.8.6.2p1: A break shall appear only in or as a loop body. 19564cffe2fd5c23168bc08f0453c684cbd3f79471d3Sebastian Redl return StmtError(Diag(ContinueLoc, diag::err_continue_not_in_loop)); 19575f016e2cb5d11daeb237544de1c5d59f20fe1a6eReid Spencer } 19584cffe2fd5c23168bc08f0453c684cbd3f79471d3Sebastian Redl 19598189cde56b4f6f938cd65f53c932fe1860d0204cTed Kremenek return Owned(new (Context) ContinueStmt(ContinueLoc)); 19605f016e2cb5d11daeb237544de1c5d59f20fe1a6eReid Spencer} 19615f016e2cb5d11daeb237544de1c5d59f20fe1a6eReid Spencer 196260d7b3a319d84d688752be3870615ac0f111fb16John McCallStmtResult 19631b273c403734d343d720acb28f04011807c8aa56Steve NaroffSema::ActOnBreakStmt(SourceLocation BreakLoc, Scope *CurScope) { 19645f016e2cb5d11daeb237544de1c5d59f20fe1a6eReid Spencer Scope *S = CurScope->getBreakParent(); 19655f016e2cb5d11daeb237544de1c5d59f20fe1a6eReid Spencer if (!S) { 19665f016e2cb5d11daeb237544de1c5d59f20fe1a6eReid Spencer // C99 6.8.6.3p1: A break shall appear only in or as a switch/loop body. 19674cffe2fd5c23168bc08f0453c684cbd3f79471d3Sebastian Redl return StmtError(Diag(BreakLoc, diag::err_break_not_in_loop_or_switch)); 19685f016e2cb5d11daeb237544de1c5d59f20fe1a6eReid Spencer } 19694cffe2fd5c23168bc08f0453c684cbd3f79471d3Sebastian Redl 19708189cde56b4f6f938cd65f53c932fe1860d0204cTed Kremenek return Owned(new (Context) BreakStmt(BreakLoc)); 19715f016e2cb5d11daeb237544de1c5d59f20fe1a6eReid Spencer} 19725f016e2cb5d11daeb237544de1c5d59f20fe1a6eReid Spencer 1973dfbb02a16ac8c764b5ba1742450513d6212d2f9fNAKAMURA Takumi/// \brief Determine whether the given expression is a candidate for 1974f5d8f466c3eebaffc51468812bdcbe7f0fe4891aDouglas Gregor/// copy elision in either a return statement or a throw expression. 19755077c3876beeaed32280af88244e8050078619a8Douglas Gregor/// 1976f5d8f466c3eebaffc51468812bdcbe7f0fe4891aDouglas Gregor/// \param ReturnType If we're determining the copy elision candidate for 1977f5d8f466c3eebaffc51468812bdcbe7f0fe4891aDouglas Gregor/// a return statement, this is the return type of the function. If we're 1978f5d8f466c3eebaffc51468812bdcbe7f0fe4891aDouglas Gregor/// determining the copy elision candidate for a throw expression, this will 1979f5d8f466c3eebaffc51468812bdcbe7f0fe4891aDouglas Gregor/// be a NULL type. 19805077c3876beeaed32280af88244e8050078619a8Douglas Gregor/// 1981f5d8f466c3eebaffc51468812bdcbe7f0fe4891aDouglas Gregor/// \param E The expression being returned from the function or block, or 1982f5d8f466c3eebaffc51468812bdcbe7f0fe4891aDouglas Gregor/// being thrown. 19835077c3876beeaed32280af88244e8050078619a8Douglas Gregor/// 19844926d832aa2f0af9d7c00633727d49e7967eb978Douglas Gregor/// \param AllowFunctionParameter Whether we allow function parameters to 19854926d832aa2f0af9d7c00633727d49e7967eb978Douglas Gregor/// be considered NRVO candidates. C++ prohibits this for NRVO itself, but 19864926d832aa2f0af9d7c00633727d49e7967eb978Douglas Gregor/// we re-use this logic to determine whether we should try to move as part of 19874926d832aa2f0af9d7c00633727d49e7967eb978Douglas Gregor/// a return or throw (which does allow function parameters). 19885077c3876beeaed32280af88244e8050078619a8Douglas Gregor/// 19895077c3876beeaed32280af88244e8050078619a8Douglas Gregor/// \returns The NRVO candidate variable, if the return statement may use the 19905077c3876beeaed32280af88244e8050078619a8Douglas Gregor/// NRVO, or NULL if there is no such candidate. 1991f5d8f466c3eebaffc51468812bdcbe7f0fe4891aDouglas Gregorconst VarDecl *Sema::getCopyElisionCandidate(QualType ReturnType, 1992f5d8f466c3eebaffc51468812bdcbe7f0fe4891aDouglas Gregor Expr *E, 1993f5d8f466c3eebaffc51468812bdcbe7f0fe4891aDouglas Gregor bool AllowFunctionParameter) { 1994f5d8f466c3eebaffc51468812bdcbe7f0fe4891aDouglas Gregor QualType ExprType = E->getType(); 19953c9034cb7ff1d6c1e4ecd1b44c98f553df013c7cDouglas Gregor // - in a return statement in a function with ... 19963c9034cb7ff1d6c1e4ecd1b44c98f553df013c7cDouglas Gregor // ... a class return type ... 1997f5d8f466c3eebaffc51468812bdcbe7f0fe4891aDouglas Gregor if (!ReturnType.isNull()) { 1998f5d8f466c3eebaffc51468812bdcbe7f0fe4891aDouglas Gregor if (!ReturnType->isRecordType()) 1999f5d8f466c3eebaffc51468812bdcbe7f0fe4891aDouglas Gregor return 0; 2000f5d8f466c3eebaffc51468812bdcbe7f0fe4891aDouglas Gregor // ... the same cv-unqualified type as the function return type ... 2001f5d8f466c3eebaffc51468812bdcbe7f0fe4891aDouglas Gregor if (!Context.hasSameUnqualifiedType(ReturnType, ExprType)) 2002f5d8f466c3eebaffc51468812bdcbe7f0fe4891aDouglas Gregor return 0; 2003f5d8f466c3eebaffc51468812bdcbe7f0fe4891aDouglas Gregor } 2004dfbb02a16ac8c764b5ba1742450513d6212d2f9fNAKAMURA Takumi 2005dfbb02a16ac8c764b5ba1742450513d6212d2f9fNAKAMURA Takumi // ... the expression is the name of a non-volatile automatic object 2006f5d8f466c3eebaffc51468812bdcbe7f0fe4891aDouglas Gregor // (other than a function or catch-clause parameter)) ... 2007f5d8f466c3eebaffc51468812bdcbe7f0fe4891aDouglas Gregor const DeclRefExpr *DR = dyn_cast<DeclRefExpr>(E->IgnoreParens()); 20083c9034cb7ff1d6c1e4ecd1b44c98f553df013c7cDouglas Gregor if (!DR) 20095077c3876beeaed32280af88244e8050078619a8Douglas Gregor return 0; 20103c9034cb7ff1d6c1e4ecd1b44c98f553df013c7cDouglas Gregor const VarDecl *VD = dyn_cast<VarDecl>(DR->getDecl()); 20113c9034cb7ff1d6c1e4ecd1b44c98f553df013c7cDouglas Gregor if (!VD) 20125077c3876beeaed32280af88244e8050078619a8Douglas Gregor return 0; 2013dfbb02a16ac8c764b5ba1742450513d6212d2f9fNAKAMURA Takumi 20141cd76e8ca8f890a4defadcae3372c025ebe7607cJohn McCall // ...object (other than a function or catch-clause parameter)... 20151cd76e8ca8f890a4defadcae3372c025ebe7607cJohn McCall if (VD->getKind() != Decl::Var && 20161cd76e8ca8f890a4defadcae3372c025ebe7607cJohn McCall !(AllowFunctionParameter && VD->getKind() == Decl::ParmVar)) 20171cd76e8ca8f890a4defadcae3372c025ebe7607cJohn McCall return 0; 20181cd76e8ca8f890a4defadcae3372c025ebe7607cJohn McCall if (VD->isExceptionVariable()) return 0; 20191cd76e8ca8f890a4defadcae3372c025ebe7607cJohn McCall 20201cd76e8ca8f890a4defadcae3372c025ebe7607cJohn McCall // ...automatic... 20211cd76e8ca8f890a4defadcae3372c025ebe7607cJohn McCall if (!VD->hasLocalStorage()) return 0; 20221cd76e8ca8f890a4defadcae3372c025ebe7607cJohn McCall 20231cd76e8ca8f890a4defadcae3372c025ebe7607cJohn McCall // ...non-volatile... 20241cd76e8ca8f890a4defadcae3372c025ebe7607cJohn McCall if (VD->getType().isVolatileQualified()) return 0; 20251cd76e8ca8f890a4defadcae3372c025ebe7607cJohn McCall if (VD->getType()->isReferenceType()) return 0; 20261cd76e8ca8f890a4defadcae3372c025ebe7607cJohn McCall 20271cd76e8ca8f890a4defadcae3372c025ebe7607cJohn McCall // __block variables can't be allocated in a way that permits NRVO. 20281cd76e8ca8f890a4defadcae3372c025ebe7607cJohn McCall if (VD->hasAttr<BlocksAttr>()) return 0; 20291cd76e8ca8f890a4defadcae3372c025ebe7607cJohn McCall 20301cd76e8ca8f890a4defadcae3372c025ebe7607cJohn McCall // Variables with higher required alignment than their type's ABI 20311cd76e8ca8f890a4defadcae3372c025ebe7607cJohn McCall // alignment cannot use NRVO. 20321cd76e8ca8f890a4defadcae3372c025ebe7607cJohn McCall if (VD->hasAttr<AlignedAttr>() && 20331cd76e8ca8f890a4defadcae3372c025ebe7607cJohn McCall Context.getDeclAlign(VD) > Context.getTypeAlignInChars(VD->getType())) 20341cd76e8ca8f890a4defadcae3372c025ebe7607cJohn McCall return 0; 2035dfbb02a16ac8c764b5ba1742450513d6212d2f9fNAKAMURA Takumi 20361cd76e8ca8f890a4defadcae3372c025ebe7607cJohn McCall return VD; 20373c9034cb7ff1d6c1e4ecd1b44c98f553df013c7cDouglas Gregor} 20383c9034cb7ff1d6c1e4ecd1b44c98f553df013c7cDouglas Gregor 203907f402cff25354c5f06f307f19b0c57c09d964bdDouglas Gregor/// \brief Perform the initialization of a potentially-movable value, which 204007f402cff25354c5f06f307f19b0c57c09d964bdDouglas Gregor/// is the result of return value. 2041cc15f010672a13b38104a32e3cefc7adc07ffbf7Douglas Gregor/// 2042cc15f010672a13b38104a32e3cefc7adc07ffbf7Douglas Gregor/// This routine implements C++0x [class.copy]p33, which attempts to treat 2043cc15f010672a13b38104a32e3cefc7adc07ffbf7Douglas Gregor/// returned lvalues as rvalues in certain cases (to prefer move construction), 2044cc15f010672a13b38104a32e3cefc7adc07ffbf7Douglas Gregor/// then falls back to treating them as lvalues if that failed. 2045dfbb02a16ac8c764b5ba1742450513d6212d2f9fNAKAMURA TakumiExprResult 204607f402cff25354c5f06f307f19b0c57c09d964bdDouglas GregorSema::PerformMoveOrCopyInitialization(const InitializedEntity &Entity, 204707f402cff25354c5f06f307f19b0c57c09d964bdDouglas Gregor const VarDecl *NRVOCandidate, 204807f402cff25354c5f06f307f19b0c57c09d964bdDouglas Gregor QualType ResultType, 2049bca01b46850f867b2f4137f25c882022b58f8471Douglas Gregor Expr *Value, 2050bca01b46850f867b2f4137f25c882022b58f8471Douglas Gregor bool AllowNRVO) { 2051cc15f010672a13b38104a32e3cefc7adc07ffbf7Douglas Gregor // C++0x [class.copy]p33: 2052dfbb02a16ac8c764b5ba1742450513d6212d2f9fNAKAMURA Takumi // When the criteria for elision of a copy operation are met or would 2053dfbb02a16ac8c764b5ba1742450513d6212d2f9fNAKAMURA Takumi // be met save for the fact that the source object is a function 2054dfbb02a16ac8c764b5ba1742450513d6212d2f9fNAKAMURA Takumi // parameter, and the object to be copied is designated by an lvalue, 2055cc15f010672a13b38104a32e3cefc7adc07ffbf7Douglas Gregor // overload resolution to select the constructor for the copy is first 2056cc15f010672a13b38104a32e3cefc7adc07ffbf7Douglas Gregor // performed as if the object were designated by an rvalue. 2057cc15f010672a13b38104a32e3cefc7adc07ffbf7Douglas Gregor ExprResult Res = ExprError(); 2058bca01b46850f867b2f4137f25c882022b58f8471Douglas Gregor if (AllowNRVO && 2059bca01b46850f867b2f4137f25c882022b58f8471Douglas Gregor (NRVOCandidate || getCopyElisionCandidate(ResultType, Value, true))) { 2060dfbb02a16ac8c764b5ba1742450513d6212d2f9fNAKAMURA Takumi ImplicitCastExpr AsRvalue(ImplicitCastExpr::OnStack, 2061dbbecccb8431bb4545fc01c6401abc4253667360Richard Smith Value->getType(), CK_NoOp, Value, VK_XValue); 2062dfbb02a16ac8c764b5ba1742450513d6212d2f9fNAKAMURA Takumi 2063cc15f010672a13b38104a32e3cefc7adc07ffbf7Douglas Gregor Expr *InitExpr = &AsRvalue; 2064dfbb02a16ac8c764b5ba1742450513d6212d2f9fNAKAMURA Takumi InitializationKind Kind 206507f402cff25354c5f06f307f19b0c57c09d964bdDouglas Gregor = InitializationKind::CreateCopy(Value->getLocStart(), 206607f402cff25354c5f06f307f19b0c57c09d964bdDouglas Gregor Value->getLocStart()); 206707f402cff25354c5f06f307f19b0c57c09d964bdDouglas Gregor InitializationSequence Seq(*this, Entity, Kind, &InitExpr, 1); 2068dfbb02a16ac8c764b5ba1742450513d6212d2f9fNAKAMURA Takumi 2069dfbb02a16ac8c764b5ba1742450513d6212d2f9fNAKAMURA Takumi // [...] If overload resolution fails, or if the type of the first 2070cc15f010672a13b38104a32e3cefc7adc07ffbf7Douglas Gregor // parameter of the selected constructor is not an rvalue reference 20710099530a2288df7c2140dd8992b7310b9f6930a9NAKAMURA Takumi // to the object's type (possibly cv-qualified), overload resolution 2072cc15f010672a13b38104a32e3cefc7adc07ffbf7Douglas Gregor // is performed again, considering the object as an lvalue. 2073383616cd2e61131a534afd9364ef53f643e1f834Sebastian Redl if (Seq) { 2074cc15f010672a13b38104a32e3cefc7adc07ffbf7Douglas Gregor for (InitializationSequence::step_iterator Step = Seq.step_begin(), 2075cc15f010672a13b38104a32e3cefc7adc07ffbf7Douglas Gregor StepEnd = Seq.step_end(); 2076cc15f010672a13b38104a32e3cefc7adc07ffbf7Douglas Gregor Step != StepEnd; ++Step) { 2077383616cd2e61131a534afd9364ef53f643e1f834Sebastian Redl if (Step->Kind != InitializationSequence::SK_ConstructorInitialization) 2078cc15f010672a13b38104a32e3cefc7adc07ffbf7Douglas Gregor continue; 2079dfbb02a16ac8c764b5ba1742450513d6212d2f9fNAKAMURA Takumi 2080dfbb02a16ac8c764b5ba1742450513d6212d2f9fNAKAMURA Takumi CXXConstructorDecl *Constructor 2081cc15f010672a13b38104a32e3cefc7adc07ffbf7Douglas Gregor = cast<CXXConstructorDecl>(Step->Function.Function); 2082dfbb02a16ac8c764b5ba1742450513d6212d2f9fNAKAMURA Takumi 2083cc15f010672a13b38104a32e3cefc7adc07ffbf7Douglas Gregor const RValueReferenceType *RRefType 208407f402cff25354c5f06f307f19b0c57c09d964bdDouglas Gregor = Constructor->getParamDecl(0)->getType() 208507f402cff25354c5f06f307f19b0c57c09d964bdDouglas Gregor ->getAs<RValueReferenceType>(); 2086dfbb02a16ac8c764b5ba1742450513d6212d2f9fNAKAMURA Takumi 2087cc15f010672a13b38104a32e3cefc7adc07ffbf7Douglas Gregor // If we don't meet the criteria, break out now. 2088dfbb02a16ac8c764b5ba1742450513d6212d2f9fNAKAMURA Takumi if (!RRefType || 208907f402cff25354c5f06f307f19b0c57c09d964bdDouglas Gregor !Context.hasSameUnqualifiedType(RRefType->getPointeeType(), 209007f402cff25354c5f06f307f19b0c57c09d964bdDouglas Gregor Context.getTypeDeclType(Constructor->getParent()))) 2091cc15f010672a13b38104a32e3cefc7adc07ffbf7Douglas Gregor break; 2092dfbb02a16ac8c764b5ba1742450513d6212d2f9fNAKAMURA Takumi 2093cc15f010672a13b38104a32e3cefc7adc07ffbf7Douglas Gregor // Promote "AsRvalue" to the heap, since we now need this 2094cc15f010672a13b38104a32e3cefc7adc07ffbf7Douglas Gregor // expression node to persist. 209507f402cff25354c5f06f307f19b0c57c09d964bdDouglas Gregor Value = ImplicitCastExpr::Create(Context, Value->getType(), 2096dbbecccb8431bb4545fc01c6401abc4253667360Richard Smith CK_NoOp, Value, 0, VK_XValue); 2097dfbb02a16ac8c764b5ba1742450513d6212d2f9fNAKAMURA Takumi 2098cc15f010672a13b38104a32e3cefc7adc07ffbf7Douglas Gregor // Complete type-checking the initialization of the return type 2099cc15f010672a13b38104a32e3cefc7adc07ffbf7Douglas Gregor // using the constructor we found. 210007f402cff25354c5f06f307f19b0c57c09d964bdDouglas Gregor Res = Seq.Perform(*this, Entity, Kind, MultiExprArg(&Value, 1)); 2101cc15f010672a13b38104a32e3cefc7adc07ffbf7Douglas Gregor } 2102cc15f010672a13b38104a32e3cefc7adc07ffbf7Douglas Gregor } 2103cc15f010672a13b38104a32e3cefc7adc07ffbf7Douglas Gregor } 2104dfbb02a16ac8c764b5ba1742450513d6212d2f9fNAKAMURA Takumi 2105cc15f010672a13b38104a32e3cefc7adc07ffbf7Douglas Gregor // Either we didn't meet the criteria for treating an lvalue as an rvalue, 2106dfbb02a16ac8c764b5ba1742450513d6212d2f9fNAKAMURA Takumi // above, or overload resolution failed. Either way, we need to try 2107cc15f010672a13b38104a32e3cefc7adc07ffbf7Douglas Gregor // (again) now with the return value expression as written. 2108cc15f010672a13b38104a32e3cefc7adc07ffbf7Douglas Gregor if (Res.isInvalid()) 210907f402cff25354c5f06f307f19b0c57c09d964bdDouglas Gregor Res = PerformCopyInitialization(Entity, SourceLocation(), Value); 2110dfbb02a16ac8c764b5ba1742450513d6212d2f9fNAKAMURA Takumi 2111cc15f010672a13b38104a32e3cefc7adc07ffbf7Douglas Gregor return Res; 2112cc15f010672a13b38104a32e3cefc7adc07ffbf7Douglas Gregor} 2113cc15f010672a13b38104a32e3cefc7adc07ffbf7Douglas Gregor 211484b007fae6c0cd30fa07074d34fbe2bf61fa44f9Eli Friedman/// ActOnCapScopeReturnStmt - Utility routine to type-check return statements 211584b007fae6c0cd30fa07074d34fbe2bf61fa44f9Eli Friedman/// for capturing scopes. 21164eb206bebcdab28ababe8df55c6185cec2cdc071Steve Naroff/// 211760d7b3a319d84d688752be3870615ac0f111fb16John McCallStmtResult 211884b007fae6c0cd30fa07074d34fbe2bf61fa44f9Eli FriedmanSema::ActOnCapScopeReturnStmt(SourceLocation ReturnLoc, Expr *RetValExp) { 211984b007fae6c0cd30fa07074d34fbe2bf61fa44f9Eli Friedman // If this is the first return we've seen, infer the return type. 212084b007fae6c0cd30fa07074d34fbe2bf61fa44f9Eli Friedman // [expr.prim.lambda]p4 in C++11; block literals follow a superset of those 212184b007fae6c0cd30fa07074d34fbe2bf61fa44f9Eli Friedman // rules which allows multiple return statements. 212284b007fae6c0cd30fa07074d34fbe2bf61fa44f9Eli Friedman CapturingScopeInfo *CurCap = cast<CapturingScopeInfo>(getCurFunction()); 21237dd900ed308506f9cf1cb72c70db1652f94cab37Jordan Rose QualType FnRetType = CurCap->ReturnType; 21247dd900ed308506f9cf1cb72c70db1652f94cab37Jordan Rose 21257dd900ed308506f9cf1cb72c70db1652f94cab37Jordan Rose // For blocks/lambdas with implicit return types, we check each return 21267dd900ed308506f9cf1cb72c70db1652f94cab37Jordan Rose // statement individually, and deduce the common return type when the block 21277dd900ed308506f9cf1cb72c70db1652f94cab37Jordan Rose // or lambda is completed. 212884b007fae6c0cd30fa07074d34fbe2bf61fa44f9Eli Friedman if (CurCap->HasImplicitReturnType) { 2129a0c2b21e0d84ad289781e08e14148da6b8b8b76dDouglas Gregor if (RetValExp && !isa<InitListExpr>(RetValExp)) { 2130429bb276991ff2dbc7c5b438828b9b7737cb15ebJohn Wiegley ExprResult Result = DefaultFunctionArrayLvalueConversion(RetValExp); 2131429bb276991ff2dbc7c5b438828b9b7737cb15ebJohn Wiegley if (Result.isInvalid()) 2132429bb276991ff2dbc7c5b438828b9b7737cb15ebJohn Wiegley return StmtError(); 2133429bb276991ff2dbc7c5b438828b9b7737cb15ebJohn Wiegley RetValExp = Result.take(); 21346a576ab708d3aa7d40e5d867ab1de5d3cb507553Douglas Gregor 21357dd900ed308506f9cf1cb72c70db1652f94cab37Jordan Rose if (!RetValExp->isTypeDependent()) 21367dd900ed308506f9cf1cb72c70db1652f94cab37Jordan Rose FnRetType = RetValExp->getType(); 21377dd900ed308506f9cf1cb72c70db1652f94cab37Jordan Rose else 21387dd900ed308506f9cf1cb72c70db1652f94cab37Jordan Rose FnRetType = CurCap->ReturnType = Context.DependentTy; 2139a0c2b21e0d84ad289781e08e14148da6b8b8b76dDouglas Gregor } else { 2140a0c2b21e0d84ad289781e08e14148da6b8b8b76dDouglas Gregor if (RetValExp) { 2141a0c2b21e0d84ad289781e08e14148da6b8b8b76dDouglas Gregor // C++11 [expr.lambda.prim]p4 bans inferring the result from an 2142a0c2b21e0d84ad289781e08e14148da6b8b8b76dDouglas Gregor // initializer list, because it is not an expression (even 2143a0c2b21e0d84ad289781e08e14148da6b8b8b76dDouglas Gregor // though we represent it as one). We still deduce 'void'. 2144a0c2b21e0d84ad289781e08e14148da6b8b8b76dDouglas Gregor Diag(ReturnLoc, diag::err_lambda_return_init_list) 2145a0c2b21e0d84ad289781e08e14148da6b8b8b76dDouglas Gregor << RetValExp->getSourceRange(); 2146a0c2b21e0d84ad289781e08e14148da6b8b8b76dDouglas Gregor } 2147a0c2b21e0d84ad289781e08e14148da6b8b8b76dDouglas Gregor 21487dd900ed308506f9cf1cb72c70db1652f94cab37Jordan Rose FnRetType = Context.VoidTy; 2149649657e7d6c150136cae5ab22e39b9794cff80ccFariborz Jahanian } 21507dd900ed308506f9cf1cb72c70db1652f94cab37Jordan Rose 21517dd900ed308506f9cf1cb72c70db1652f94cab37Jordan Rose // Although we'll properly infer the type of the block once it's completed, 21527dd900ed308506f9cf1cb72c70db1652f94cab37Jordan Rose // make sure we provide a return type now for better error recovery. 21537dd900ed308506f9cf1cb72c70db1652f94cab37Jordan Rose if (CurCap->ReturnType.isNull()) 21547dd900ed308506f9cf1cb72c70db1652f94cab37Jordan Rose CurCap->ReturnType = FnRetType; 21554eb206bebcdab28ababe8df55c6185cec2cdc071Steve Naroff } 215684b007fae6c0cd30fa07074d34fbe2bf61fa44f9Eli Friedman assert(!FnRetType.isNull()); 21574cffe2fd5c23168bc08f0453c684cbd3f79471d3Sebastian Redl 2158793cd1c4cdfaafc52e2c2ad9dae959befe4bb166Douglas Gregor if (BlockScopeInfo *CurBlock = dyn_cast<BlockScopeInfo>(CurCap)) { 215984b007fae6c0cd30fa07074d34fbe2bf61fa44f9Eli Friedman if (CurBlock->FunctionType->getAs<FunctionType>()->getNoReturnAttr()) { 216084b007fae6c0cd30fa07074d34fbe2bf61fa44f9Eli Friedman Diag(ReturnLoc, diag::err_noreturn_block_has_return_expr); 216184b007fae6c0cd30fa07074d34fbe2bf61fa44f9Eli Friedman return StmtError(); 216284b007fae6c0cd30fa07074d34fbe2bf61fa44f9Eli Friedman } 2163793cd1c4cdfaafc52e2c2ad9dae959befe4bb166Douglas Gregor } else { 2164793cd1c4cdfaafc52e2c2ad9dae959befe4bb166Douglas Gregor LambdaScopeInfo *LSI = cast<LambdaScopeInfo>(CurCap); 2165793cd1c4cdfaafc52e2c2ad9dae959befe4bb166Douglas Gregor if (LSI->CallOperator->getType()->getAs<FunctionType>()->getNoReturnAttr()){ 2166793cd1c4cdfaafc52e2c2ad9dae959befe4bb166Douglas Gregor Diag(ReturnLoc, diag::err_noreturn_lambda_has_return_expr); 2167793cd1c4cdfaafc52e2c2ad9dae959befe4bb166Douglas Gregor return StmtError(); 2168793cd1c4cdfaafc52e2c2ad9dae959befe4bb166Douglas Gregor } 2169793cd1c4cdfaafc52e2c2ad9dae959befe4bb166Douglas Gregor } 21706c92fa75e62937f9738696840efcb258560f4568Mike Stump 21714eb206bebcdab28ababe8df55c6185cec2cdc071Steve Naroff // Otherwise, verify that this result type matches the previous one. We are 21724eb206bebcdab28ababe8df55c6185cec2cdc071Steve Naroff // pickier with blocks than for normal functions because we don't have GCC 21734eb206bebcdab28ababe8df55c6185cec2cdc071Steve Naroff // compatibility to worry about here. 2174d963c37eb912342c8325048749e449861cf0a6e3John McCall const VarDecl *NRVOCandidate = 0; 21750a7efe1142d241678c91bf93ee6adb51289863a4John McCall if (FnRetType->isDependentType()) { 21760a7efe1142d241678c91bf93ee6adb51289863a4John McCall // Delay processing for now. TODO: there are lots of dependent 21770a7efe1142d241678c91bf93ee6adb51289863a4John McCall // types we can conclusively prove aren't void. 21780a7efe1142d241678c91bf93ee6adb51289863a4John McCall } else if (FnRetType->isVoidType()) { 21795b38a0f98e4420dae1bd3e13959bc207c97a9e98Sebastian Redl if (RetValExp && !isa<InitListExpr>(RetValExp) && 21804e4d08403ca5cfd4d558fa2936215d3a4e5a528dDavid Blaikie !(getLangOpts().CPlusPlus && 21810a7efe1142d241678c91bf93ee6adb51289863a4John McCall (RetValExp->isTypeDependent() || 21820a7efe1142d241678c91bf93ee6adb51289863a4John McCall RetValExp->getType()->isVoidType()))) { 21834e648e4770d85febaf15ad8b7bad458bd7338ae2Fariborz Jahanian if (!getLangOpts().CPlusPlus && 21844e648e4770d85febaf15ad8b7bad458bd7338ae2Fariborz Jahanian RetValExp->getType()->isVoidType()) 21859354f6aaa70e1543d122644fee0c3f834324d2fcFariborz Jahanian Diag(ReturnLoc, diag::ext_return_has_void_expr) << "literal" << 2; 21864e648e4770d85febaf15ad8b7bad458bd7338ae2Fariborz Jahanian else { 21874e648e4770d85febaf15ad8b7bad458bd7338ae2Fariborz Jahanian Diag(ReturnLoc, diag::err_return_block_has_expr); 21884e648e4770d85febaf15ad8b7bad458bd7338ae2Fariborz Jahanian RetValExp = 0; 21894e648e4770d85febaf15ad8b7bad458bd7338ae2Fariborz Jahanian } 21904eb206bebcdab28ababe8df55c6185cec2cdc071Steve Naroff } 21915077c3876beeaed32280af88244e8050078619a8Douglas Gregor } else if (!RetValExp) { 21920a7efe1142d241678c91bf93ee6adb51289863a4John McCall return StmtError(Diag(ReturnLoc, diag::err_block_return_missing_expr)); 21930a7efe1142d241678c91bf93ee6adb51289863a4John McCall } else if (!RetValExp->isTypeDependent()) { 21940a7efe1142d241678c91bf93ee6adb51289863a4John McCall // we have a non-void block with an expression, continue checking 21950a7efe1142d241678c91bf93ee6adb51289863a4John McCall 21960a7efe1142d241678c91bf93ee6adb51289863a4John McCall // C99 6.8.6.4p3(136): The return statement is not an assignment. The 21970a7efe1142d241678c91bf93ee6adb51289863a4John McCall // overlap restriction of subclause 6.5.16.1 does not apply to the case of 21980a7efe1142d241678c91bf93ee6adb51289863a4John McCall // function return. 21990a7efe1142d241678c91bf93ee6adb51289863a4John McCall 22000a7efe1142d241678c91bf93ee6adb51289863a4John McCall // In C++ the return statement is handled via a copy initialization. 22010a7efe1142d241678c91bf93ee6adb51289863a4John McCall // the C version of which boils down to CheckSingleAssignmentConstraints. 22020a7efe1142d241678c91bf93ee6adb51289863a4John McCall NRVOCandidate = getCopyElisionCandidate(FnRetType, RetValExp, false); 22030a7efe1142d241678c91bf93ee6adb51289863a4John McCall InitializedEntity Entity = InitializedEntity::InitializeResult(ReturnLoc, 22040a7efe1142d241678c91bf93ee6adb51289863a4John McCall FnRetType, 22050586520acb2f368c874943353a222be7f00c3068Fariborz Jahanian NRVOCandidate != 0); 22060a7efe1142d241678c91bf93ee6adb51289863a4John McCall ExprResult Res = PerformMoveOrCopyInitialization(Entity, NRVOCandidate, 22070a7efe1142d241678c91bf93ee6adb51289863a4John McCall FnRetType, RetValExp); 22080a7efe1142d241678c91bf93ee6adb51289863a4John McCall if (Res.isInvalid()) { 22090a7efe1142d241678c91bf93ee6adb51289863a4John McCall // FIXME: Cleanup temporaries here, anyway? 22100a7efe1142d241678c91bf93ee6adb51289863a4John McCall return StmtError(); 2211c6acbc58a7aef0a3382775424c80e9534b54b2edAnders Carlsson } 22120a7efe1142d241678c91bf93ee6adb51289863a4John McCall RetValExp = Res.take(); 22130a7efe1142d241678c91bf93ee6adb51289863a4John McCall CheckReturnStackAddr(RetValExp, FnRetType, ReturnLoc); 2214d963c37eb912342c8325048749e449861cf0a6e3John McCall } 2215dfbb02a16ac8c764b5ba1742450513d6212d2f9fNAKAMURA Takumi 2216d963c37eb912342c8325048749e449861cf0a6e3John McCall if (RetValExp) { 2217d963c37eb912342c8325048749e449861cf0a6e3John McCall CheckImplicitConversions(RetValExp, ReturnLoc); 2218d963c37eb912342c8325048749e449861cf0a6e3John McCall RetValExp = MaybeCreateExprWithCleanups(RetValExp); 221998eb8a7a702b95183ed015706b1f1c66f5cb27a4Mike Stump } 22200a7efe1142d241678c91bf93ee6adb51289863a4John McCall ReturnStmt *Result = new (Context) ReturnStmt(ReturnLoc, RetValExp, 22210a7efe1142d241678c91bf93ee6adb51289863a4John McCall NRVOCandidate); 22224cffe2fd5c23168bc08f0453c684cbd3f79471d3Sebastian Redl 22237dd900ed308506f9cf1cb72c70db1652f94cab37Jordan Rose // If we need to check for the named return value optimization, 22247dd900ed308506f9cf1cb72c70db1652f94cab37Jordan Rose // or if we need to infer the return type, 22257dd900ed308506f9cf1cb72c70db1652f94cab37Jordan Rose // save the return statement in our scope for later processing. 22267dd900ed308506f9cf1cb72c70db1652f94cab37Jordan Rose if (CurCap->HasImplicitReturnType || 22277dd900ed308506f9cf1cb72c70db1652f94cab37Jordan Rose (getLangOpts().CPlusPlus && FnRetType->isRecordType() && 22287dd900ed308506f9cf1cb72c70db1652f94cab37Jordan Rose !CurContext->isDependentContext())) 22295077c3876beeaed32280af88244e8050078619a8Douglas Gregor FunctionScopes.back()->Returns.push_back(Result); 2230dfbb02a16ac8c764b5ba1742450513d6212d2f9fNAKAMURA Takumi 22315077c3876beeaed32280af88244e8050078619a8Douglas Gregor return Owned(Result); 22324eb206bebcdab28ababe8df55c6185cec2cdc071Steve Naroff} 22335f016e2cb5d11daeb237544de1c5d59f20fe1a6eReid Spencer 223460d7b3a319d84d688752be3870615ac0f111fb16John McCallStmtResult 22359ae2f076ca5ab1feb3ba95629099ec2319833701John McCallSema::ActOnReturnStmt(SourceLocation ReturnLoc, Expr *RetValExp) { 2236fc92137eee708b632c00a9b0934ff87aeae234a5Douglas Gregor // Check for unexpanded parameter packs. 2237fc92137eee708b632c00a9b0934ff87aeae234a5Douglas Gregor if (RetValExp && DiagnoseUnexpandedParameterPack(RetValExp)) 2238fc92137eee708b632c00a9b0934ff87aeae234a5Douglas Gregor return StmtError(); 2239fc92137eee708b632c00a9b0934ff87aeae234a5Douglas Gregor 224084b007fae6c0cd30fa07074d34fbe2bf61fa44f9Eli Friedman if (isa<CapturingScopeInfo>(getCurFunction())) 224184b007fae6c0cd30fa07074d34fbe2bf61fa44f9Eli Friedman return ActOnCapScopeReturnStmt(ReturnLoc, RetValExp); 22424cffe2fd5c23168bc08f0453c684cbd3f79471d3Sebastian Redl 2243371f258e61e1365b951b17931a3c5ac1530fd1a0Chris Lattner QualType FnRetType; 224438ac243e300798e8cd9fe05888cd97beabfb94e6Eli Friedman QualType RelatedRetType; 2245f7c41dab1a8de29b0991e853b8822bb0d1ddc01cMike Stump if (const FunctionDecl *FD = getCurFunctionDecl()) { 2246371f258e61e1365b951b17931a3c5ac1530fd1a0Chris Lattner FnRetType = FD->getResultType(); 224704a67a6aa3dfdc92d57f7f8d93ba397348c868a4John McCall if (FD->hasAttr<NoReturnAttr>() || 224804a67a6aa3dfdc92d57f7f8d93ba397348c868a4John McCall FD->getType()->getAs<FunctionType>()->getNoReturnAttr()) 22498662587fa75d3fb04f873e265841c9314c7f5523Chris Lattner Diag(ReturnLoc, diag::warn_noreturn_function_has_return_expr) 225079430e9983f5e67a378fc1f50cd6278f2cea8259Eli Friedman << FD->getDeclName(); 2251926df6cfabf3eaa4afc990c097fa4619b76a9b57Douglas Gregor } else if (ObjCMethodDecl *MD = getCurMethodDecl()) { 225238ac243e300798e8cd9fe05888cd97beabfb94e6Eli Friedman FnRetType = MD->getResultType(); 2253926df6cfabf3eaa4afc990c097fa4619b76a9b57Douglas Gregor if (MD->hasRelatedResultType() && MD->getClassInterface()) { 2254926df6cfabf3eaa4afc990c097fa4619b76a9b57Douglas Gregor // In the implementation of a method with a related return type, the 2255926df6cfabf3eaa4afc990c097fa4619b76a9b57Douglas Gregor // type used to type-check the validity of return statements within the 2256926df6cfabf3eaa4afc990c097fa4619b76a9b57Douglas Gregor // method body is a pointer to the type of the class being implemented. 225738ac243e300798e8cd9fe05888cd97beabfb94e6Eli Friedman RelatedRetType = Context.getObjCInterfaceType(MD->getClassInterface()); 225838ac243e300798e8cd9fe05888cd97beabfb94e6Eli Friedman RelatedRetType = Context.getObjCObjectPointerType(RelatedRetType); 2259926df6cfabf3eaa4afc990c097fa4619b76a9b57Douglas Gregor } 2260926df6cfabf3eaa4afc990c097fa4619b76a9b57Douglas Gregor } else // If we don't have a function/method context, bail. 2261c97fb9a394ce2cc5e664fcb472e93553528378adSteve Naroff return StmtError(); 22621eb4433ac451dc16f4133a88af2d002ac26c58efMike Stump 22635077c3876beeaed32280af88244e8050078619a8Douglas Gregor ReturnStmt *Result = 0; 22645cf216b7fa64b933b60743b0b26053e8e7aa87beChris Lattner if (FnRetType->isVoidType()) { 22658d7946151cd15c0e7c34250c122d59b2f5027999Nick Lewycky if (RetValExp) { 226633deb35535aebe81bed0eaf5c14f3032276a086eSebastian Redl if (isa<InitListExpr>(RetValExp)) { 226733deb35535aebe81bed0eaf5c14f3032276a086eSebastian Redl // We simply never allow init lists as the return value of void 226833deb35535aebe81bed0eaf5c14f3032276a086eSebastian Redl // functions. This is compatible because this was never allowed before, 226933deb35535aebe81bed0eaf5c14f3032276a086eSebastian Redl // so there's no legacy code to deal with. 227033deb35535aebe81bed0eaf5c14f3032276a086eSebastian Redl NamedDecl *CurDecl = getCurFunctionOrMethodDecl(); 227133deb35535aebe81bed0eaf5c14f3032276a086eSebastian Redl int FunctionKind = 0; 227233deb35535aebe81bed0eaf5c14f3032276a086eSebastian Redl if (isa<ObjCMethodDecl>(CurDecl)) 227333deb35535aebe81bed0eaf5c14f3032276a086eSebastian Redl FunctionKind = 1; 227433deb35535aebe81bed0eaf5c14f3032276a086eSebastian Redl else if (isa<CXXConstructorDecl>(CurDecl)) 227533deb35535aebe81bed0eaf5c14f3032276a086eSebastian Redl FunctionKind = 2; 227633deb35535aebe81bed0eaf5c14f3032276a086eSebastian Redl else if (isa<CXXDestructorDecl>(CurDecl)) 227733deb35535aebe81bed0eaf5c14f3032276a086eSebastian Redl FunctionKind = 3; 227833deb35535aebe81bed0eaf5c14f3032276a086eSebastian Redl 227933deb35535aebe81bed0eaf5c14f3032276a086eSebastian Redl Diag(ReturnLoc, diag::err_return_init_list) 228033deb35535aebe81bed0eaf5c14f3032276a086eSebastian Redl << CurDecl->getDeclName() << FunctionKind 228133deb35535aebe81bed0eaf5c14f3032276a086eSebastian Redl << RetValExp->getSourceRange(); 228233deb35535aebe81bed0eaf5c14f3032276a086eSebastian Redl 228333deb35535aebe81bed0eaf5c14f3032276a086eSebastian Redl // Drop the expression. 228433deb35535aebe81bed0eaf5c14f3032276a086eSebastian Redl RetValExp = 0; 228533deb35535aebe81bed0eaf5c14f3032276a086eSebastian Redl } else if (!RetValExp->isTypeDependent()) { 22868d7946151cd15c0e7c34250c122d59b2f5027999Nick Lewycky // C99 6.8.6.4p1 (ext_ since GCC warns) 22878d7946151cd15c0e7c34250c122d59b2f5027999Nick Lewycky unsigned D = diag::ext_return_has_expr; 22888d7946151cd15c0e7c34250c122d59b2f5027999Nick Lewycky if (RetValExp->getType()->isVoidType()) 22898d7946151cd15c0e7c34250c122d59b2f5027999Nick Lewycky D = diag::ext_return_has_void_expr; 22908d7946151cd15c0e7c34250c122d59b2f5027999Nick Lewycky else { 22918d7946151cd15c0e7c34250c122d59b2f5027999Nick Lewycky ExprResult Result = Owned(RetValExp); 22928d7946151cd15c0e7c34250c122d59b2f5027999Nick Lewycky Result = IgnoredValueConversions(Result.take()); 22938d7946151cd15c0e7c34250c122d59b2f5027999Nick Lewycky if (Result.isInvalid()) 22948d7946151cd15c0e7c34250c122d59b2f5027999Nick Lewycky return StmtError(); 22958d7946151cd15c0e7c34250c122d59b2f5027999Nick Lewycky RetValExp = Result.take(); 22968d7946151cd15c0e7c34250c122d59b2f5027999Nick Lewycky RetValExp = ImpCastExprToType(RetValExp, 22978d7946151cd15c0e7c34250c122d59b2f5027999Nick Lewycky Context.VoidTy, CK_ToVoid).take(); 22988d7946151cd15c0e7c34250c122d59b2f5027999Nick Lewycky } 22994cffe2fd5c23168bc08f0453c684cbd3f79471d3Sebastian Redl 23008d7946151cd15c0e7c34250c122d59b2f5027999Nick Lewycky // return (some void expression); is legal in C++. 23018d7946151cd15c0e7c34250c122d59b2f5027999Nick Lewycky if (D != diag::ext_return_has_void_expr || 23024e4d08403ca5cfd4d558fa2936215d3a4e5a528dDavid Blaikie !getLangOpts().CPlusPlus) { 23038d7946151cd15c0e7c34250c122d59b2f5027999Nick Lewycky NamedDecl *CurDecl = getCurFunctionOrMethodDecl(); 2304ca0d0d4a0d6ecd256d4bf8c1a0dc183a83119833Chandler Carruth 2305ca0d0d4a0d6ecd256d4bf8c1a0dc183a83119833Chandler Carruth int FunctionKind = 0; 2306ca0d0d4a0d6ecd256d4bf8c1a0dc183a83119833Chandler Carruth if (isa<ObjCMethodDecl>(CurDecl)) 2307ca0d0d4a0d6ecd256d4bf8c1a0dc183a83119833Chandler Carruth FunctionKind = 1; 2308ca0d0d4a0d6ecd256d4bf8c1a0dc183a83119833Chandler Carruth else if (isa<CXXConstructorDecl>(CurDecl)) 2309ca0d0d4a0d6ecd256d4bf8c1a0dc183a83119833Chandler Carruth FunctionKind = 2; 2310ca0d0d4a0d6ecd256d4bf8c1a0dc183a83119833Chandler Carruth else if (isa<CXXDestructorDecl>(CurDecl)) 2311ca0d0d4a0d6ecd256d4bf8c1a0dc183a83119833Chandler Carruth FunctionKind = 3; 2312ca0d0d4a0d6ecd256d4bf8c1a0dc183a83119833Chandler Carruth 23138d7946151cd15c0e7c34250c122d59b2f5027999Nick Lewycky Diag(ReturnLoc, D) 2314ca0d0d4a0d6ecd256d4bf8c1a0dc183a83119833Chandler Carruth << CurDecl->getDeclName() << FunctionKind 23158d7946151cd15c0e7c34250c122d59b2f5027999Nick Lewycky << RetValExp->getSourceRange(); 23168d7946151cd15c0e7c34250c122d59b2f5027999Nick Lewycky } 2317e878eb035b343d7d819c092102364ec9849716aeChris Lattner } 23181eb4433ac451dc16f4133a88af2d002ac26c58efMike Stump 231933deb35535aebe81bed0eaf5c14f3032276a086eSebastian Redl if (RetValExp) { 232033deb35535aebe81bed0eaf5c14f3032276a086eSebastian Redl CheckImplicitConversions(RetValExp, ReturnLoc); 232133deb35535aebe81bed0eaf5c14f3032276a086eSebastian Redl RetValExp = MaybeCreateExprWithCleanups(RetValExp); 232233deb35535aebe81bed0eaf5c14f3032276a086eSebastian Redl } 23235f016e2cb5d11daeb237544de1c5d59f20fe1a6eReid Spencer } 2324dfbb02a16ac8c764b5ba1742450513d6212d2f9fNAKAMURA Takumi 23255077c3876beeaed32280af88244e8050078619a8Douglas Gregor Result = new (Context) ReturnStmt(ReturnLoc, RetValExp, 0); 23265077c3876beeaed32280af88244e8050078619a8Douglas Gregor } else if (!RetValExp && !FnRetType->isDependentType()) { 23273c73c41cefcfe76f36b7bed72c9f1ec195490951Chris Lattner unsigned DiagID = diag::warn_return_missing_expr; // C90 6.6.6.4p4 23283c73c41cefcfe76f36b7bed72c9f1ec195490951Chris Lattner // C99 6.8.6.4p1 (ext_ since GCC warns) 23294e4d08403ca5cfd4d558fa2936215d3a4e5a528dDavid Blaikie if (getLangOpts().C99) DiagID = diag::ext_return_missing_expr; 23303c73c41cefcfe76f36b7bed72c9f1ec195490951Chris Lattner 23313c73c41cefcfe76f36b7bed72c9f1ec195490951Chris Lattner if (FunctionDecl *FD = getCurFunctionDecl()) 233208631c5fa053867146b5ee8be658c229f6bf127cChris Lattner Diag(ReturnLoc, DiagID) << FD->getIdentifier() << 0/*fn*/; 23333c73c41cefcfe76f36b7bed72c9f1ec195490951Chris Lattner else 233408631c5fa053867146b5ee8be658c229f6bf127cChris Lattner Diag(ReturnLoc, DiagID) << getCurMethodDecl()->getDeclName() << 1/*meth*/; 23355077c3876beeaed32280af88244e8050078619a8Douglas Gregor Result = new (Context) ReturnStmt(ReturnLoc); 23365077c3876beeaed32280af88244e8050078619a8Douglas Gregor } else { 23375077c3876beeaed32280af88244e8050078619a8Douglas Gregor const VarDecl *NRVOCandidate = 0; 23385077c3876beeaed32280af88244e8050078619a8Douglas Gregor if (!FnRetType->isDependentType() && !RetValExp->isTypeDependent()) { 23395077c3876beeaed32280af88244e8050078619a8Douglas Gregor // we have a non-void function with an expression, continue checking 23405077c3876beeaed32280af88244e8050078619a8Douglas Gregor 234138ac243e300798e8cd9fe05888cd97beabfb94e6Eli Friedman if (!RelatedRetType.isNull()) { 234238ac243e300798e8cd9fe05888cd97beabfb94e6Eli Friedman // If we have a related result type, perform an extra conversion here. 234338ac243e300798e8cd9fe05888cd97beabfb94e6Eli Friedman // FIXME: The diagnostics here don't really describe what is happening. 234438ac243e300798e8cd9fe05888cd97beabfb94e6Eli Friedman InitializedEntity Entity = 234538ac243e300798e8cd9fe05888cd97beabfb94e6Eli Friedman InitializedEntity::InitializeTemporary(RelatedRetType); 23468e1e0543cc3b63e0bc116bae0d2f1e8fc530b436Chad Rosier 234738ac243e300798e8cd9fe05888cd97beabfb94e6Eli Friedman ExprResult Res = PerformCopyInitialization(Entity, SourceLocation(), 234838ac243e300798e8cd9fe05888cd97beabfb94e6Eli Friedman RetValExp); 234938ac243e300798e8cd9fe05888cd97beabfb94e6Eli Friedman if (Res.isInvalid()) { 235038ac243e300798e8cd9fe05888cd97beabfb94e6Eli Friedman // FIXME: Cleanup temporaries here, anyway? 235138ac243e300798e8cd9fe05888cd97beabfb94e6Eli Friedman return StmtError(); 235238ac243e300798e8cd9fe05888cd97beabfb94e6Eli Friedman } 235338ac243e300798e8cd9fe05888cd97beabfb94e6Eli Friedman RetValExp = Res.takeAs<Expr>(); 235438ac243e300798e8cd9fe05888cd97beabfb94e6Eli Friedman } 235538ac243e300798e8cd9fe05888cd97beabfb94e6Eli Friedman 23565077c3876beeaed32280af88244e8050078619a8Douglas Gregor // C99 6.8.6.4p3(136): The return statement is not an assignment. The 23575077c3876beeaed32280af88244e8050078619a8Douglas Gregor // overlap restriction of subclause 6.5.16.1 does not apply to the case of 23585077c3876beeaed32280af88244e8050078619a8Douglas Gregor // function return. 23595077c3876beeaed32280af88244e8050078619a8Douglas Gregor 2360856d3798af7c2f7251e4a295f3da7a09ce4c62abJohn McCall // In C++ the return statement is handled via a copy initialization, 23615077c3876beeaed32280af88244e8050078619a8Douglas Gregor // the C version of which boils down to CheckSingleAssignmentConstraints. 2362f5d8f466c3eebaffc51468812bdcbe7f0fe4891aDouglas Gregor NRVOCandidate = getCopyElisionCandidate(FnRetType, RetValExp, false); 2363dfbb02a16ac8c764b5ba1742450513d6212d2f9fNAKAMURA Takumi InitializedEntity Entity = InitializedEntity::InitializeResult(ReturnLoc, 236407f402cff25354c5f06f307f19b0c57c09d964bdDouglas Gregor FnRetType, 236558f14c012e5d739b09532bb12645dc161f88cfcfFrancois Pichet NRVOCandidate != 0); 2366dfbb02a16ac8c764b5ba1742450513d6212d2f9fNAKAMURA Takumi ExprResult Res = PerformMoveOrCopyInitialization(Entity, NRVOCandidate, 236707f402cff25354c5f06f307f19b0c57c09d964bdDouglas Gregor FnRetType, RetValExp); 23685077c3876beeaed32280af88244e8050078619a8Douglas Gregor if (Res.isInvalid()) { 23695077c3876beeaed32280af88244e8050078619a8Douglas Gregor // FIXME: Cleanup temporaries here, anyway? 23705077c3876beeaed32280af88244e8050078619a8Douglas Gregor return StmtError(); 23715077c3876beeaed32280af88244e8050078619a8Douglas Gregor } 23724cffe2fd5c23168bc08f0453c684cbd3f79471d3Sebastian Redl 23735077c3876beeaed32280af88244e8050078619a8Douglas Gregor RetValExp = Res.takeAs<Expr>(); 2374dfbb02a16ac8c764b5ba1742450513d6212d2f9fNAKAMURA Takumi if (RetValExp) 23755077c3876beeaed32280af88244e8050078619a8Douglas Gregor CheckReturnStackAddr(RetValExp, FnRetType, ReturnLoc); 237666724ea67d7d598b937d86fa66f03f09a1c758f3Douglas Gregor } 2377dfbb02a16ac8c764b5ba1742450513d6212d2f9fNAKAMURA Takumi 2378b4eb64d8426c0eaa58d398961e0e74ff85063d7cJohn McCall if (RetValExp) { 2379b4eb64d8426c0eaa58d398961e0e74ff85063d7cJohn McCall CheckImplicitConversions(RetValExp, ReturnLoc); 23804765fa05b5652fcc4356371c2f481d0ea9a1b007John McCall RetValExp = MaybeCreateExprWithCleanups(RetValExp); 2381b4eb64d8426c0eaa58d398961e0e74ff85063d7cJohn McCall } 23825077c3876beeaed32280af88244e8050078619a8Douglas Gregor Result = new (Context) ReturnStmt(ReturnLoc, RetValExp, NRVOCandidate); 2383898574e7496ba8fd76290079d3a9d06954992734Douglas Gregor } 2384dfbb02a16ac8c764b5ba1742450513d6212d2f9fNAKAMURA Takumi 2385dfbb02a16ac8c764b5ba1742450513d6212d2f9fNAKAMURA Takumi // If we need to check for the named return value optimization, save the 23865077c3876beeaed32280af88244e8050078619a8Douglas Gregor // return statement in our scope for later processing. 23874e4d08403ca5cfd4d558fa2936215d3a4e5a528dDavid Blaikie if (getLangOpts().CPlusPlus && FnRetType->isRecordType() && 23885077c3876beeaed32280af88244e8050078619a8Douglas Gregor !CurContext->isDependentContext()) 23895077c3876beeaed32280af88244e8050078619a8Douglas Gregor FunctionScopes.back()->Returns.push_back(Result); 23908e1e0543cc3b63e0bc116bae0d2f1e8fc530b436Chad Rosier 23915077c3876beeaed32280af88244e8050078619a8Douglas Gregor return Owned(Result); 23925f016e2cb5d11daeb237544de1c5d59f20fe1a6eReid Spencer} 23935f016e2cb5d11daeb237544de1c5d59f20fe1a6eReid Spencer 2394810f6d5d6223adaab0ccf0139f40de6484ad1bb5Chris Lattner/// CheckAsmLValue - GNU C has an extremely ugly extension whereby they silently 2395810f6d5d6223adaab0ccf0139f40de6484ad1bb5Chris Lattner/// ignore "noop" casts in places where an lvalue is required by an inline asm. 2396810f6d5d6223adaab0ccf0139f40de6484ad1bb5Chris Lattner/// We emulate this behavior when -fheinous-gnu-extensions is specified, but 2397810f6d5d6223adaab0ccf0139f40de6484ad1bb5Chris Lattner/// provide a strong guidance to not use it. 2398810f6d5d6223adaab0ccf0139f40de6484ad1bb5Chris Lattner/// 2399810f6d5d6223adaab0ccf0139f40de6484ad1bb5Chris Lattner/// This method checks to see if the argument is an acceptable l-value and 2400810f6d5d6223adaab0ccf0139f40de6484ad1bb5Chris Lattner/// returns false if it is a case we can handle. 2401810f6d5d6223adaab0ccf0139f40de6484ad1bb5Chris Lattnerstatic bool CheckAsmLValue(const Expr *E, Sema &S) { 2402703e39486689d6660e75f6b6de0068db031a51c7Anders Carlsson // Type dependent expressions will be checked during instantiation. 2403703e39486689d6660e75f6b6de0068db031a51c7Anders Carlsson if (E->isTypeDependent()) 2404703e39486689d6660e75f6b6de0068db031a51c7Anders Carlsson return false; 2405dfbb02a16ac8c764b5ba1742450513d6212d2f9fNAKAMURA Takumi 24067eb0a9eb0cde8444b97f9c5b713d9be7a6f1e607John McCall if (E->isLValue()) 2407810f6d5d6223adaab0ccf0139f40de6484ad1bb5Chris Lattner return false; // Cool, this is an lvalue. 2408810f6d5d6223adaab0ccf0139f40de6484ad1bb5Chris Lattner 2409810f6d5d6223adaab0ccf0139f40de6484ad1bb5Chris Lattner // Okay, this is not an lvalue, but perhaps it is the result of a cast that we 2410810f6d5d6223adaab0ccf0139f40de6484ad1bb5Chris Lattner // are supposed to allow. 2411810f6d5d6223adaab0ccf0139f40de6484ad1bb5Chris Lattner const Expr *E2 = E->IgnoreParenNoopCasts(S.Context); 24127eb0a9eb0cde8444b97f9c5b713d9be7a6f1e607John McCall if (E != E2 && E2->isLValue()) { 24134e4d08403ca5cfd4d558fa2936215d3a4e5a528dDavid Blaikie if (!S.getLangOpts().HeinousExtensions) 2414810f6d5d6223adaab0ccf0139f40de6484ad1bb5Chris Lattner S.Diag(E2->getLocStart(), diag::err_invalid_asm_cast_lvalue) 2415810f6d5d6223adaab0ccf0139f40de6484ad1bb5Chris Lattner << E->getSourceRange(); 2416810f6d5d6223adaab0ccf0139f40de6484ad1bb5Chris Lattner else 2417810f6d5d6223adaab0ccf0139f40de6484ad1bb5Chris Lattner S.Diag(E2->getLocStart(), diag::warn_invalid_asm_cast_lvalue) 2418810f6d5d6223adaab0ccf0139f40de6484ad1bb5Chris Lattner << E->getSourceRange(); 2419810f6d5d6223adaab0ccf0139f40de6484ad1bb5Chris Lattner // Accept, even if we emitted an error diagnostic. 2420810f6d5d6223adaab0ccf0139f40de6484ad1bb5Chris Lattner return false; 2421810f6d5d6223adaab0ccf0139f40de6484ad1bb5Chris Lattner } 2422810f6d5d6223adaab0ccf0139f40de6484ad1bb5Chris Lattner 2423810f6d5d6223adaab0ccf0139f40de6484ad1bb5Chris Lattner // None of the above, just randomly invalid non-lvalue. 2424810f6d5d6223adaab0ccf0139f40de6484ad1bb5Chris Lattner return true; 2425810f6d5d6223adaab0ccf0139f40de6484ad1bb5Chris Lattner} 2426810f6d5d6223adaab0ccf0139f40de6484ad1bb5Chris Lattner 2427ca57b4b7658a031b74cda5ac504311998be8e343Chris Lattner/// isOperandMentioned - Return true if the specified operand # is mentioned 2428ca57b4b7658a031b74cda5ac504311998be8e343Chris Lattner/// anywhere in the decomposed asm string. 2429ca57b4b7658a031b74cda5ac504311998be8e343Chris Lattnerstatic bool isOperandMentioned(unsigned OpNo, 24302d3ba4f5a923a90c3fc290ddfba5e36c2d0a9b46Chris Lattner ArrayRef<AsmStmt::AsmStringPiece> AsmStrPieces) { 2431ca57b4b7658a031b74cda5ac504311998be8e343Chris Lattner for (unsigned p = 0, e = AsmStrPieces.size(); p != e; ++p) { 2432ca57b4b7658a031b74cda5ac504311998be8e343Chris Lattner const AsmStmt::AsmStringPiece &Piece = AsmStrPieces[p]; 2433ca57b4b7658a031b74cda5ac504311998be8e343Chris Lattner if (!Piece.isOperand()) continue; 24348e1e0543cc3b63e0bc116bae0d2f1e8fc530b436Chad Rosier 2435ca57b4b7658a031b74cda5ac504311998be8e343Chris Lattner // If this is a reference to the input and if the input was the smaller 2436ca57b4b7658a031b74cda5ac504311998be8e343Chris Lattner // one, then we have to reject this asm. 2437ca57b4b7658a031b74cda5ac504311998be8e343Chris Lattner if (Piece.getOperandNo() == OpNo) 2438ca57b4b7658a031b74cda5ac504311998be8e343Chris Lattner return true; 2439ca57b4b7658a031b74cda5ac504311998be8e343Chris Lattner } 2440ca57b4b7658a031b74cda5ac504311998be8e343Chris Lattner return false; 2441ca57b4b7658a031b74cda5ac504311998be8e343Chris Lattner} 2442810f6d5d6223adaab0ccf0139f40de6484ad1bb5Chris Lattner 2443ca57b4b7658a031b74cda5ac504311998be8e343Chris LattnerStmtResult Sema::ActOnAsmStmt(SourceLocation AsmLoc, bool IsSimple, 2444ca57b4b7658a031b74cda5ac504311998be8e343Chris Lattner bool IsVolatile, unsigned NumOutputs, 2445ca57b4b7658a031b74cda5ac504311998be8e343Chris Lattner unsigned NumInputs, IdentifierInfo **Names, 2446ca57b4b7658a031b74cda5ac504311998be8e343Chris Lattner MultiExprArg constraints, MultiExprArg exprs, 2447ca57b4b7658a031b74cda5ac504311998be8e343Chris Lattner Expr *asmString, MultiExprArg clobbers, 2448ca57b4b7658a031b74cda5ac504311998be8e343Chris Lattner SourceLocation RParenLoc, bool MSAsm) { 24493037ed0a27dba62e522304183718efc149e8b6d9Sebastian Redl unsigned NumClobbers = clobbers.size(); 24503037ed0a27dba62e522304183718efc149e8b6d9Sebastian Redl StringLiteral **Constraints = 24513037ed0a27dba62e522304183718efc149e8b6d9Sebastian Redl reinterpret_cast<StringLiteral**>(constraints.get()); 24529ae2f076ca5ab1feb3ba95629099ec2319833701John McCall Expr **Exprs = exprs.get(); 24539ae2f076ca5ab1feb3ba95629099ec2319833701John McCall StringLiteral *AsmString = cast<StringLiteral>(asmString); 24543037ed0a27dba62e522304183718efc149e8b6d9Sebastian Redl StringLiteral **Clobbers = reinterpret_cast<StringLiteral**>(clobbers.get()); 24553037ed0a27dba62e522304183718efc149e8b6d9Sebastian Redl 24565f9e272e632e951b1efe824cd16acb4d96077930Chris Lattner SmallVector<TargetInfo::ConstraintInfo, 4> OutputConstraintInfos; 24571eb4433ac451dc16f4133a88af2d002ac26c58efMike Stump 24581708b963a014b48103e78131f960a13ee1aa6d0cChris Lattner // The parser verifies that there is a string literal here. 24595cee1195584fa8672253139c86e922daeda69b9eDouglas Gregor if (!AsmString->isAscii()) 24603037ed0a27dba62e522304183718efc149e8b6d9Sebastian Redl return StmtError(Diag(AsmString->getLocStart(),diag::err_asm_wide_character) 24613037ed0a27dba62e522304183718efc149e8b6d9Sebastian Redl << AsmString->getSourceRange()); 24623037ed0a27dba62e522304183718efc149e8b6d9Sebastian Redl 24631708b963a014b48103e78131f960a13ee1aa6d0cChris Lattner for (unsigned i = 0; i != NumOutputs; i++) { 24641708b963a014b48103e78131f960a13ee1aa6d0cChris Lattner StringLiteral *Literal = Constraints[i]; 24655cee1195584fa8672253139c86e922daeda69b9eDouglas Gregor if (!Literal->isAscii()) 24663037ed0a27dba62e522304183718efc149e8b6d9Sebastian Redl return StmtError(Diag(Literal->getLocStart(),diag::err_asm_wide_character) 24673037ed0a27dba62e522304183718efc149e8b6d9Sebastian Redl << Literal->getSourceRange()); 24683037ed0a27dba62e522304183718efc149e8b6d9Sebastian Redl 24695f9e272e632e951b1efe824cd16acb4d96077930Chris Lattner StringRef OutputName; 2470ff93dbd887e40588ed55d135037bb9287488b285Anders Carlsson if (Names[i]) 2471ff93dbd887e40588ed55d135037bb9287488b285Anders Carlsson OutputName = Names[i]->getName(); 2472ff93dbd887e40588ed55d135037bb9287488b285Anders Carlsson 2473ff93dbd887e40588ed55d135037bb9287488b285Anders Carlsson TargetInfo::ConstraintInfo Info(Literal->getString(), OutputName); 2474bcfd1f55bfbb3e5944cd5e03d07b343e280838c4Douglas Gregor if (!Context.getTargetInfo().validateOutputConstraint(Info)) 24753037ed0a27dba62e522304183718efc149e8b6d9Sebastian Redl return StmtError(Diag(Literal->getLocStart(), 2476432c86969eced2ce658b3f3f2aa7407c8864f21bChris Lattner diag::err_asm_invalid_output_constraint) 2477432c86969eced2ce658b3f3f2aa7407c8864f21bChris Lattner << Info.getConstraintStr()); 24783037ed0a27dba62e522304183718efc149e8b6d9Sebastian Redl 2479d04c6e23f2e10eeb9936778d67f4a1c4a14cc4f6Anders Carlsson // Check that the output exprs are valid lvalues. 248072056a237c536ee63285ab0850cb50f299281767Eli Friedman Expr *OutputExpr = Exprs[i]; 2481810f6d5d6223adaab0ccf0139f40de6484ad1bb5Chris Lattner if (CheckAsmLValue(OutputExpr, *this)) { 248272056a237c536ee63285ab0850cb50f299281767Eli Friedman return StmtError(Diag(OutputExpr->getLocStart(), 2483dcd5ef12488e4c7ea844327835896ca86b609a97Chris Lattner diag::err_asm_invalid_lvalue_in_output) 248472056a237c536ee63285ab0850cb50f299281767Eli Friedman << OutputExpr->getSourceRange()); 248504728b7ea928b029f165fc67d32ced40e6868b31Anders Carlsson } 24861eb4433ac451dc16f4133a88af2d002ac26c58efMike Stump 248744def070435a2b5d67f0534f7a3a85a7389d60f2Chris Lattner OutputConstraintInfos.push_back(Info); 248804728b7ea928b029f165fc67d32ced40e6868b31Anders Carlsson } 24893037ed0a27dba62e522304183718efc149e8b6d9Sebastian Redl 24905f9e272e632e951b1efe824cd16acb4d96077930Chris Lattner SmallVector<TargetInfo::ConstraintInfo, 4> InputConstraintInfos; 2491806503f8c839d7f5ebf3fbf7ee848c179be76dd2Chris Lattner 249204728b7ea928b029f165fc67d32ced40e6868b31Anders Carlsson for (unsigned i = NumOutputs, e = NumOutputs + NumInputs; i != e; i++) { 24931708b963a014b48103e78131f960a13ee1aa6d0cChris Lattner StringLiteral *Literal = Constraints[i]; 24945cee1195584fa8672253139c86e922daeda69b9eDouglas Gregor if (!Literal->isAscii()) 24953037ed0a27dba62e522304183718efc149e8b6d9Sebastian Redl return StmtError(Diag(Literal->getLocStart(),diag::err_asm_wide_character) 24963037ed0a27dba62e522304183718efc149e8b6d9Sebastian Redl << Literal->getSourceRange()); 24973037ed0a27dba62e522304183718efc149e8b6d9Sebastian Redl 24985f9e272e632e951b1efe824cd16acb4d96077930Chris Lattner StringRef InputName; 2499ff93dbd887e40588ed55d135037bb9287488b285Anders Carlsson if (Names[i]) 2500ff93dbd887e40588ed55d135037bb9287488b285Anders Carlsson InputName = Names[i]->getName(); 2501ff93dbd887e40588ed55d135037bb9287488b285Anders Carlsson 2502ff93dbd887e40588ed55d135037bb9287488b285Anders Carlsson TargetInfo::ConstraintInfo Info(Literal->getString(), InputName); 2503bcfd1f55bfbb3e5944cd5e03d07b343e280838c4Douglas Gregor if (!Context.getTargetInfo().validateInputConstraint(OutputConstraintInfos.data(), 25042819fa85651526d59ade4fdc9da2cadd7b132973Chris Lattner NumOutputs, Info)) { 25053037ed0a27dba62e522304183718efc149e8b6d9Sebastian Redl return StmtError(Diag(Literal->getLocStart(), 2506432c86969eced2ce658b3f3f2aa7407c8864f21bChris Lattner diag::err_asm_invalid_input_constraint) 2507432c86969eced2ce658b3f3f2aa7407c8864f21bChris Lattner << Info.getConstraintStr()); 2508d04c6e23f2e10eeb9936778d67f4a1c4a14cc4f6Anders Carlsson } 25093037ed0a27dba62e522304183718efc149e8b6d9Sebastian Redl 251072056a237c536ee63285ab0850cb50f299281767Eli Friedman Expr *InputExpr = Exprs[i]; 25113037ed0a27dba62e522304183718efc149e8b6d9Sebastian Redl 2512d9fca6e3950346ea503f92f27ed0f9d8edde9febAnders Carlsson // Only allow void types for memory constraints. 251344def070435a2b5d67f0534f7a3a85a7389d60f2Chris Lattner if (Info.allowsMemory() && !Info.allowsRegister()) { 2514810f6d5d6223adaab0ccf0139f40de6484ad1bb5Chris Lattner if (CheckAsmLValue(InputExpr, *this)) 251572056a237c536ee63285ab0850cb50f299281767Eli Friedman return StmtError(Diag(InputExpr->getLocStart(), 2516d9fca6e3950346ea503f92f27ed0f9d8edde9febAnders Carlsson diag::err_asm_invalid_lvalue_in_input) 2517432c86969eced2ce658b3f3f2aa7407c8864f21bChris Lattner << Info.getConstraintStr() 251872056a237c536ee63285ab0850cb50f299281767Eli Friedman << InputExpr->getSourceRange()); 251904728b7ea928b029f165fc67d32ced40e6868b31Anders Carlsson } 25203037ed0a27dba62e522304183718efc149e8b6d9Sebastian Redl 252144def070435a2b5d67f0534f7a3a85a7389d60f2Chris Lattner if (Info.allowsRegister()) { 2522d9fca6e3950346ea503f92f27ed0f9d8edde9febAnders Carlsson if (InputExpr->getType()->isVoidType()) { 252372056a237c536ee63285ab0850cb50f299281767Eli Friedman return StmtError(Diag(InputExpr->getLocStart(), 2524d9fca6e3950346ea503f92f27ed0f9d8edde9febAnders Carlsson diag::err_asm_invalid_type_in_input) 25251eb4433ac451dc16f4133a88af2d002ac26c58efMike Stump << InputExpr->getType() << Info.getConstraintStr() 252672056a237c536ee63285ab0850cb50f299281767Eli Friedman << InputExpr->getSourceRange()); 2527d9fca6e3950346ea503f92f27ed0f9d8edde9febAnders Carlsson } 2528d9fca6e3950346ea503f92f27ed0f9d8edde9febAnders Carlsson } 25291eb4433ac451dc16f4133a88af2d002ac26c58efMike Stump 2530429bb276991ff2dbc7c5b438828b9b7737cb15ebJohn Wiegley ExprResult Result = DefaultFunctionArrayLvalueConversion(Exprs[i]); 2531429bb276991ff2dbc7c5b438828b9b7737cb15ebJohn Wiegley if (Result.isInvalid()) 2532429bb276991ff2dbc7c5b438828b9b7737cb15ebJohn Wiegley return StmtError(); 25331eb4433ac451dc16f4133a88af2d002ac26c58efMike Stump 2534429bb276991ff2dbc7c5b438828b9b7737cb15ebJohn Wiegley Exprs[i] = Result.take(); 2535806503f8c839d7f5ebf3fbf7ee848c179be76dd2Chris Lattner InputConstraintInfos.push_back(Info); 253604728b7ea928b029f165fc67d32ced40e6868b31Anders Carlsson } 25373037ed0a27dba62e522304183718efc149e8b6d9Sebastian Redl 25386fa9086043b0338d895a4cdb0ec8542530af90d7Anders Carlsson // Check that the clobbers are valid. 25391708b963a014b48103e78131f960a13ee1aa6d0cChris Lattner for (unsigned i = 0; i != NumClobbers; i++) { 25401708b963a014b48103e78131f960a13ee1aa6d0cChris Lattner StringLiteral *Literal = Clobbers[i]; 25415cee1195584fa8672253139c86e922daeda69b9eDouglas Gregor if (!Literal->isAscii()) 25423037ed0a27dba62e522304183718efc149e8b6d9Sebastian Redl return StmtError(Diag(Literal->getLocStart(),diag::err_asm_wide_character) 25433037ed0a27dba62e522304183718efc149e8b6d9Sebastian Redl << Literal->getSourceRange()); 25443037ed0a27dba62e522304183718efc149e8b6d9Sebastian Redl 25455f9e272e632e951b1efe824cd16acb4d96077930Chris Lattner StringRef Clobber = Literal->getString(); 25463037ed0a27dba62e522304183718efc149e8b6d9Sebastian Redl 2547bcfd1f55bfbb3e5944cd5e03d07b343e280838c4Douglas Gregor if (!Context.getTargetInfo().isValidClobber(Clobber)) 25483037ed0a27dba62e522304183718efc149e8b6d9Sebastian Redl return StmtError(Diag(Literal->getLocStart(), 25497765934ad7e157b5fcf925792a38e01b1edbcf8aDaniel Dunbar diag::err_asm_unknown_register_name) << Clobber); 25506fa9086043b0338d895a4cdb0ec8542530af90d7Anders Carlsson } 25513037ed0a27dba62e522304183718efc149e8b6d9Sebastian Redl 2552fb5058ef67c054296c88db18ab1b3717845cb71dChris Lattner AsmStmt *NS = 2553dfbb02a16ac8c764b5ba1742450513d6212d2f9fNAKAMURA Takumi new (Context) AsmStmt(Context, AsmLoc, IsSimple, IsVolatile, MSAsm, 2554dfbb02a16ac8c764b5ba1742450513d6212d2f9fNAKAMURA Takumi NumOutputs, NumInputs, Names, Constraints, Exprs, 2555966146e89141804ff6492739a2a6e6592ca671c7Anders Carlsson AsmString, NumClobbers, Clobbers, RParenLoc); 2556fb5058ef67c054296c88db18ab1b3717845cb71dChris Lattner // Validate the asm string, ensuring it makes sense given the operands we 2557fb5058ef67c054296c88db18ab1b3717845cb71dChris Lattner // have. 25585f9e272e632e951b1efe824cd16acb4d96077930Chris Lattner SmallVector<AsmStmt::AsmStringPiece, 8> Pieces; 2559fb5058ef67c054296c88db18ab1b3717845cb71dChris Lattner unsigned DiagOffs; 2560fb5058ef67c054296c88db18ab1b3717845cb71dChris Lattner if (unsigned DiagID = NS->AnalyzeAsmString(Pieces, Context, DiagOffs)) { 25612ff0f42a962fec5a6300b5986297b417db173e6aChris Lattner Diag(getLocationOfStringLiteralByte(AsmString, DiagOffs), DiagID) 25622ff0f42a962fec5a6300b5986297b417db173e6aChris Lattner << AsmString->getSourceRange(); 2563fb5058ef67c054296c88db18ab1b3717845cb71dChris Lattner return StmtError(); 2564fb5058ef67c054296c88db18ab1b3717845cb71dChris Lattner } 25651eb4433ac451dc16f4133a88af2d002ac26c58efMike Stump 2566806503f8c839d7f5ebf3fbf7ee848c179be76dd2Chris Lattner // Validate tied input operands for type mismatches. 2567806503f8c839d7f5ebf3fbf7ee848c179be76dd2Chris Lattner for (unsigned i = 0, e = InputConstraintInfos.size(); i != e; ++i) { 2568806503f8c839d7f5ebf3fbf7ee848c179be76dd2Chris Lattner TargetInfo::ConstraintInfo &Info = InputConstraintInfos[i]; 25691eb4433ac451dc16f4133a88af2d002ac26c58efMike Stump 2570806503f8c839d7f5ebf3fbf7ee848c179be76dd2Chris Lattner // If this is a tied constraint, verify that the output and input have 2571806503f8c839d7f5ebf3fbf7ee848c179be76dd2Chris Lattner // either exactly the same type, or that they are int/ptr operands with the 2572806503f8c839d7f5ebf3fbf7ee848c179be76dd2Chris Lattner // same size (int/long, int*/long, are ok etc). 2573806503f8c839d7f5ebf3fbf7ee848c179be76dd2Chris Lattner if (!Info.hasTiedOperand()) continue; 25741eb4433ac451dc16f4133a88af2d002ac26c58efMike Stump 2575806503f8c839d7f5ebf3fbf7ee848c179be76dd2Chris Lattner unsigned TiedTo = Info.getTiedOperand(); 2576935f0f01c1ed3c2052b797ac035d57a85b78adc4Chris Lattner unsigned InputOpNo = i+NumOutputs; 2577f69fcaeb3843297757251a19f0a6f5bbffed7f32Chris Lattner Expr *OutputExpr = Exprs[TiedTo]; 2578935f0f01c1ed3c2052b797ac035d57a85b78adc4Chris Lattner Expr *InputExpr = Exprs[InputOpNo]; 2579f45b357c0d0df99e160a6320e279ef788dd91ba6Eli Friedman 2580f45b357c0d0df99e160a6320e279ef788dd91ba6Eli Friedman if (OutputExpr->isTypeDependent() || InputExpr->isTypeDependent()) 2581f45b357c0d0df99e160a6320e279ef788dd91ba6Eli Friedman continue; 2582f45b357c0d0df99e160a6320e279ef788dd91ba6Eli Friedman 25837adaa18ef3be65971cd41cc61dd739baeb02af10Chris Lattner QualType InTy = InputExpr->getType(); 25847adaa18ef3be65971cd41cc61dd739baeb02af10Chris Lattner QualType OutTy = OutputExpr->getType(); 25857adaa18ef3be65971cd41cc61dd739baeb02af10Chris Lattner if (Context.hasSameType(InTy, OutTy)) 2586806503f8c839d7f5ebf3fbf7ee848c179be76dd2Chris Lattner continue; // All types can be tied to themselves. 25871eb4433ac451dc16f4133a88af2d002ac26c58efMike Stump 2588aab64d0b7f41ed30b15ba9210ed859424cbc7455Chris Lattner // Decide if the input and output are in the same domain (integer/ptr or 2589aab64d0b7f41ed30b15ba9210ed859424cbc7455Chris Lattner // floating point. 2590aab64d0b7f41ed30b15ba9210ed859424cbc7455Chris Lattner enum AsmDomain { 2591aab64d0b7f41ed30b15ba9210ed859424cbc7455Chris Lattner AD_Int, AD_FP, AD_Other 2592aab64d0b7f41ed30b15ba9210ed859424cbc7455Chris Lattner } InputDomain, OutputDomain; 2593dfbb02a16ac8c764b5ba1742450513d6212d2f9fNAKAMURA Takumi 2594aab64d0b7f41ed30b15ba9210ed859424cbc7455Chris Lattner if (InTy->isIntegerType() || InTy->isPointerType()) 2595aab64d0b7f41ed30b15ba9210ed859424cbc7455Chris Lattner InputDomain = AD_Int; 25960c293ea13d452c1a47a05ada5a5ee9acc69c66ccDouglas Gregor else if (InTy->isRealFloatingType()) 2597aab64d0b7f41ed30b15ba9210ed859424cbc7455Chris Lattner InputDomain = AD_FP; 2598aab64d0b7f41ed30b15ba9210ed859424cbc7455Chris Lattner else 2599aab64d0b7f41ed30b15ba9210ed859424cbc7455Chris Lattner InputDomain = AD_Other; 26003351f1145aa91ddd8022fcd3ca16c219db9e8277Chris Lattner 2601aab64d0b7f41ed30b15ba9210ed859424cbc7455Chris Lattner if (OutTy->isIntegerType() || OutTy->isPointerType()) 2602aab64d0b7f41ed30b15ba9210ed859424cbc7455Chris Lattner OutputDomain = AD_Int; 26030c293ea13d452c1a47a05ada5a5ee9acc69c66ccDouglas Gregor else if (OutTy->isRealFloatingType()) 2604aab64d0b7f41ed30b15ba9210ed859424cbc7455Chris Lattner OutputDomain = AD_FP; 2605aab64d0b7f41ed30b15ba9210ed859424cbc7455Chris Lattner else 2606aab64d0b7f41ed30b15ba9210ed859424cbc7455Chris Lattner OutputDomain = AD_Other; 2607dfbb02a16ac8c764b5ba1742450513d6212d2f9fNAKAMURA Takumi 2608aab64d0b7f41ed30b15ba9210ed859424cbc7455Chris Lattner // They are ok if they are the same size and in the same domain. This 2609aab64d0b7f41ed30b15ba9210ed859424cbc7455Chris Lattner // allows tying things like: 2610aab64d0b7f41ed30b15ba9210ed859424cbc7455Chris Lattner // void* to int* 2611aab64d0b7f41ed30b15ba9210ed859424cbc7455Chris Lattner // void* to int if they are the same size. 2612aab64d0b7f41ed30b15ba9210ed859424cbc7455Chris Lattner // double to long double if they are the same size. 2613dfbb02a16ac8c764b5ba1742450513d6212d2f9fNAKAMURA Takumi // 2614aab64d0b7f41ed30b15ba9210ed859424cbc7455Chris Lattner uint64_t OutSize = Context.getTypeSize(OutTy); 2615aab64d0b7f41ed30b15ba9210ed859424cbc7455Chris Lattner uint64_t InSize = Context.getTypeSize(InTy); 2616aab64d0b7f41ed30b15ba9210ed859424cbc7455Chris Lattner if (OutSize == InSize && InputDomain == OutputDomain && 2617aab64d0b7f41ed30b15ba9210ed859424cbc7455Chris Lattner InputDomain != AD_Other) 2618aab64d0b7f41ed30b15ba9210ed859424cbc7455Chris Lattner continue; 2619dfbb02a16ac8c764b5ba1742450513d6212d2f9fNAKAMURA Takumi 2620aab64d0b7f41ed30b15ba9210ed859424cbc7455Chris Lattner // If the smaller input/output operand is not mentioned in the asm string, 2621f0c4d28020fb13fdbf7d6fccfab1b7b6a118ad0eChris Lattner // then we can promote the smaller one to a larger input and the asm string 2622f0c4d28020fb13fdbf7d6fccfab1b7b6a118ad0eChris Lattner // won't notice. 2623aab64d0b7f41ed30b15ba9210ed859424cbc7455Chris Lattner bool SmallerValueMentioned = false; 26248e1e0543cc3b63e0bc116bae0d2f1e8fc530b436Chad Rosier 2625ca57b4b7658a031b74cda5ac504311998be8e343Chris Lattner // If this is a reference to the input and if the input was the smaller 2626ca57b4b7658a031b74cda5ac504311998be8e343Chris Lattner // one, then we have to reject this asm. 2627935f0f01c1ed3c2052b797ac035d57a85b78adc4Chris Lattner if (isOperandMentioned(InputOpNo, Pieces)) { 2628ca57b4b7658a031b74cda5ac504311998be8e343Chris Lattner // This is a use in the asm string of the smaller operand. Since we 2629ca57b4b7658a031b74cda5ac504311998be8e343Chris Lattner // codegen this by promoting to a wider value, the asm will get printed 2630ca57b4b7658a031b74cda5ac504311998be8e343Chris Lattner // "wrong". 2631f0c4d28020fb13fdbf7d6fccfab1b7b6a118ad0eChris Lattner SmallerValueMentioned |= InSize < OutSize; 2632ca57b4b7658a031b74cda5ac504311998be8e343Chris Lattner } 2633f0c4d28020fb13fdbf7d6fccfab1b7b6a118ad0eChris Lattner if (isOperandMentioned(TiedTo, Pieces)) { 2634ca57b4b7658a031b74cda5ac504311998be8e343Chris Lattner // If this is a reference to the output, and if the output is the larger 2635ca57b4b7658a031b74cda5ac504311998be8e343Chris Lattner // value, then it's ok because we'll promote the input to the larger type. 2636f0c4d28020fb13fdbf7d6fccfab1b7b6a118ad0eChris Lattner SmallerValueMentioned |= OutSize < InSize; 2637806503f8c839d7f5ebf3fbf7ee848c179be76dd2Chris Lattner } 26381eb4433ac451dc16f4133a88af2d002ac26c58efMike Stump 2639aab64d0b7f41ed30b15ba9210ed859424cbc7455Chris Lattner // If the smaller value wasn't mentioned in the asm string, and if the 2640aab64d0b7f41ed30b15ba9210ed859424cbc7455Chris Lattner // output was a register, just extend the shorter one to the size of the 2641aab64d0b7f41ed30b15ba9210ed859424cbc7455Chris Lattner // larger one. 2642aab64d0b7f41ed30b15ba9210ed859424cbc7455Chris Lattner if (!SmallerValueMentioned && InputDomain != AD_Other && 2643aab64d0b7f41ed30b15ba9210ed859424cbc7455Chris Lattner OutputConstraintInfos[TiedTo].allowsRegister()) 2644aab64d0b7f41ed30b15ba9210ed859424cbc7455Chris Lattner continue; 26458e1e0543cc3b63e0bc116bae0d2f1e8fc530b436Chad Rosier 2646935f0f01c1ed3c2052b797ac035d57a85b78adc4Chris Lattner // Either both of the operands were mentioned or the smaller one was 2647935f0f01c1ed3c2052b797ac035d57a85b78adc4Chris Lattner // mentioned. One more special case that we'll allow: if the tied input is 2648935f0f01c1ed3c2052b797ac035d57a85b78adc4Chris Lattner // integer, unmentioned, and is a constant, then we'll allow truncating it 2649935f0f01c1ed3c2052b797ac035d57a85b78adc4Chris Lattner // down to the size of the destination. 2650935f0f01c1ed3c2052b797ac035d57a85b78adc4Chris Lattner if (InputDomain == AD_Int && OutputDomain == AD_Int && 2651935f0f01c1ed3c2052b797ac035d57a85b78adc4Chris Lattner !isOperandMentioned(InputOpNo, Pieces) && 2652935f0f01c1ed3c2052b797ac035d57a85b78adc4Chris Lattner InputExpr->isEvaluatable(Context)) { 26534da89c87b2b6ca31f1015ec19aae65a02971ea9aJohn McCall CastKind castKind = 26544da89c87b2b6ca31f1015ec19aae65a02971ea9aJohn McCall (OutTy->isBooleanType() ? CK_IntegralToBoolean : CK_IntegralCast); 26554da89c87b2b6ca31f1015ec19aae65a02971ea9aJohn McCall InputExpr = ImpCastExprToType(InputExpr, OutTy, castKind).take(); 2656935f0f01c1ed3c2052b797ac035d57a85b78adc4Chris Lattner Exprs[InputOpNo] = InputExpr; 2657935f0f01c1ed3c2052b797ac035d57a85b78adc4Chris Lattner NS->setInputExpr(i, InputExpr); 2658935f0f01c1ed3c2052b797ac035d57a85b78adc4Chris Lattner continue; 2659935f0f01c1ed3c2052b797ac035d57a85b78adc4Chris Lattner } 26608e1e0543cc3b63e0bc116bae0d2f1e8fc530b436Chad Rosier 2661c1f3b28004a032f4cd13721d4d884c6dcec29c31Chris Lattner Diag(InputExpr->getLocStart(), 2662806503f8c839d7f5ebf3fbf7ee848c179be76dd2Chris Lattner diag::err_asm_tying_incompatible_types) 26637adaa18ef3be65971cd41cc61dd739baeb02af10Chris Lattner << InTy << OutTy << OutputExpr->getSourceRange() 2664806503f8c839d7f5ebf3fbf7ee848c179be76dd2Chris Lattner << InputExpr->getSourceRange(); 2665806503f8c839d7f5ebf3fbf7ee848c179be76dd2Chris Lattner return StmtError(); 2666806503f8c839d7f5ebf3fbf7ee848c179be76dd2Chris Lattner } 26671eb4433ac451dc16f4133a88af2d002ac26c58efMike Stump 2668fb5058ef67c054296c88db18ab1b3717845cb71dChris Lattner return Owned(NS); 2669fe795956194141c91ae555985c9b930595bff43fChris Lattner} 26703b1191d7eaf2f4984564e01ab84b6713a9d80e70Fariborz Jahanian 26718cd64b4c5553fa6284d248336cb7c82dc960a394Chad RosierStmtResult Sema::ActOnMSAsmStmt(SourceLocation AsmLoc, 26728cd64b4c5553fa6284d248336cb7c82dc960a394Chad Rosier std::string &AsmString, 26738cd64b4c5553fa6284d248336cb7c82dc960a394Chad Rosier SourceLocation EndLoc) { 267452e4ed949ba52958db1e938860e3b49944ce8680Chad Rosier // MS-style inline assembly is not fully supported, so emit a warning. 267552e4ed949ba52958db1e938860e3b49944ce8680Chad Rosier Diag(AsmLoc, diag::warn_unsupported_msasm); 267652e4ed949ba52958db1e938860e3b49944ce8680Chad Rosier 26778cd64b4c5553fa6284d248336cb7c82dc960a394Chad Rosier MSAsmStmt *NS = 26788cd64b4c5553fa6284d248336cb7c82dc960a394Chad Rosier new (Context) MSAsmStmt(Context, AsmLoc, AsmString, EndLoc); 26798cd64b4c5553fa6284d248336cb7c82dc960a394Chad Rosier 26808cd64b4c5553fa6284d248336cb7c82dc960a394Chad Rosier return Owned(NS); 26818cd64b4c5553fa6284d248336cb7c82dc960a394Chad Rosier} 26828cd64b4c5553fa6284d248336cb7c82dc960a394Chad Rosier 268360d7b3a319d84d688752be3870615ac0f111fb16John McCallStmtResult 2684431e90e887c21c0d0d56fc12a2d359df8d53ea66Sebastian RedlSema::ActOnObjCAtCatchStmt(SourceLocation AtLoc, 2685d226f65006733ed7f709c3174f22ce33391cb58fJohn McCall SourceLocation RParen, Decl *Parm, 26869ae2f076ca5ab1feb3ba95629099ec2319833701John McCall Stmt *Body) { 2687d226f65006733ed7f709c3174f22ce33391cb58fJohn McCall VarDecl *Var = cast_or_null<VarDecl>(Parm); 2688160b5630aa781ac348303e1ae088d27016637778Douglas Gregor if (Var && Var->isInvalidDecl()) 2689160b5630aa781ac348303e1ae088d27016637778Douglas Gregor return StmtError(); 2690dfbb02a16ac8c764b5ba1742450513d6212d2f9fNAKAMURA Takumi 26919ae2f076ca5ab1feb3ba95629099ec2319833701John McCall return Owned(new (Context) ObjCAtCatchStmt(AtLoc, RParen, Var, Body)); 26923b1191d7eaf2f4984564e01ab84b6713a9d80e70Fariborz Jahanian} 26933b1191d7eaf2f4984564e01ab84b6713a9d80e70Fariborz Jahanian 269460d7b3a319d84d688752be3870615ac0f111fb16John McCallStmtResult 26959ae2f076ca5ab1feb3ba95629099ec2319833701John McCallSema::ActOnObjCAtFinallyStmt(SourceLocation AtLoc, Stmt *Body) { 26969ae2f076ca5ab1feb3ba95629099ec2319833701John McCall return Owned(new (Context) ObjCAtFinallyStmt(AtLoc, Body)); 2697161a9c5afaafb4d527b7efba9675a8b2cbbe32e0Fariborz Jahanian} 2698bd49a647afd9cc534fef13cadf652d4e9c396e2bFariborz Jahanian 269960d7b3a319d84d688752be3870615ac0f111fb16John McCallStmtResult 2700dfbb02a16ac8c764b5ba1742450513d6212d2f9fNAKAMURA TakumiSema::ActOnObjCAtTryStmt(SourceLocation AtLoc, Stmt *Try, 27019ae2f076ca5ab1feb3ba95629099ec2319833701John McCall MultiStmtArg CatchStmts, Stmt *Finally) { 27024e4d08403ca5cfd4d558fa2936215d3a4e5a528dDavid Blaikie if (!getLangOpts().ObjCExceptions) 2703da4b7cf09ebfd4e4098b516081fa9dae2f5c99e0Anders Carlsson Diag(AtLoc, diag::err_objc_exceptions_disabled) << "@try"; 2704da4b7cf09ebfd4e4098b516081fa9dae2f5c99e0Anders Carlsson 2705781472fe99a120098c631b0cbe33c89f8cef5e70John McCall getCurFunction()->setHasBranchProtectedScope(); 27068f5e3dd32e443768d9dbbad7191e123e6733750cDouglas Gregor unsigned NumCatchStmts = CatchStmts.size(); 27079ae2f076ca5ab1feb3ba95629099ec2319833701John McCall return Owned(ObjCAtTryStmt::Create(Context, AtLoc, Try, 27089ae2f076ca5ab1feb3ba95629099ec2319833701John McCall CatchStmts.release(), 27098f5e3dd32e443768d9dbbad7191e123e6733750cDouglas Gregor NumCatchStmts, 27109ae2f076ca5ab1feb3ba95629099ec2319833701John McCall Finally)); 2711bd49a647afd9cc534fef13cadf652d4e9c396e2bFariborz Jahanian} 2712bd49a647afd9cc534fef13cadf652d4e9c396e2bFariborz Jahanian 2713d1376ee0945a4eba0590ae33d14bade860b08a7dJohn McCallStmtResult Sema::BuildObjCAtThrowStmt(SourceLocation AtLoc, Expr *Throw) { 2714d1377b25a36adfe6604f78cbd3a23a07cf0f29e6Douglas Gregor if (Throw) { 2715429bb276991ff2dbc7c5b438828b9b7737cb15ebJohn Wiegley ExprResult Result = DefaultLvalueConversion(Throw); 2716429bb276991ff2dbc7c5b438828b9b7737cb15ebJohn Wiegley if (Result.isInvalid()) 2717429bb276991ff2dbc7c5b438828b9b7737cb15ebJohn Wiegley return StmtError(); 27185e3c67b4bd894a926282d24b4d0cbc0e123c9f4aJohn McCall 2719d1376ee0945a4eba0590ae33d14bade860b08a7dJohn McCall Throw = MaybeCreateExprWithCleanups(Result.take()); 2720d1377b25a36adfe6604f78cbd3a23a07cf0f29e6Douglas Gregor QualType ThrowType = Throw->getType(); 2721d1377b25a36adfe6604f78cbd3a23a07cf0f29e6Douglas Gregor // Make sure the expression type is an ObjC pointer or "void *". 2722d1377b25a36adfe6604f78cbd3a23a07cf0f29e6Douglas Gregor if (!ThrowType->isDependentType() && 2723d1377b25a36adfe6604f78cbd3a23a07cf0f29e6Douglas Gregor !ThrowType->isObjCObjectPointerType()) { 2724d1377b25a36adfe6604f78cbd3a23a07cf0f29e6Douglas Gregor const PointerType *PT = ThrowType->getAs<PointerType>(); 2725d1377b25a36adfe6604f78cbd3a23a07cf0f29e6Douglas Gregor if (!PT || !PT->getPointeeType()->isVoidType()) 2726d1377b25a36adfe6604f78cbd3a23a07cf0f29e6Douglas Gregor return StmtError(Diag(AtLoc, diag::error_objc_throw_expects_object) 2727d1377b25a36adfe6604f78cbd3a23a07cf0f29e6Douglas Gregor << Throw->getType() << Throw->getSourceRange()); 2728d1377b25a36adfe6604f78cbd3a23a07cf0f29e6Douglas Gregor } 2729d1377b25a36adfe6604f78cbd3a23a07cf0f29e6Douglas Gregor } 2730dfbb02a16ac8c764b5ba1742450513d6212d2f9fNAKAMURA Takumi 27319ae2f076ca5ab1feb3ba95629099ec2319833701John McCall return Owned(new (Context) ObjCAtThrowStmt(AtLoc, Throw)); 2732d1377b25a36adfe6604f78cbd3a23a07cf0f29e6Douglas Gregor} 2733d1377b25a36adfe6604f78cbd3a23a07cf0f29e6Douglas Gregor 273460d7b3a319d84d688752be3870615ac0f111fb16John McCallStmtResult 2735dfbb02a16ac8c764b5ba1742450513d6212d2f9fNAKAMURA TakumiSema::ActOnObjCAtThrowStmt(SourceLocation AtLoc, Expr *Throw, 2736d1377b25a36adfe6604f78cbd3a23a07cf0f29e6Douglas Gregor Scope *CurScope) { 27374e4d08403ca5cfd4d558fa2936215d3a4e5a528dDavid Blaikie if (!getLangOpts().ObjCExceptions) 2738da4b7cf09ebfd4e4098b516081fa9dae2f5c99e0Anders Carlsson Diag(AtLoc, diag::err_objc_exceptions_disabled) << "@throw"; 2739da4b7cf09ebfd4e4098b516081fa9dae2f5c99e0Anders Carlsson 27409ae2f076ca5ab1feb3ba95629099ec2319833701John McCall if (!Throw) { 2741e21dd6ffef4585fa43cd3586ed971217d65bf56cSteve Naroff // @throw without an expression designates a rethrow (which much occur 2742e21dd6ffef4585fa43cd3586ed971217d65bf56cSteve Naroff // in the context of an @catch clause). 2743e21dd6ffef4585fa43cd3586ed971217d65bf56cSteve Naroff Scope *AtCatchParent = CurScope; 2744e21dd6ffef4585fa43cd3586ed971217d65bf56cSteve Naroff while (AtCatchParent && !AtCatchParent->isAtCatchScope()) 2745e21dd6ffef4585fa43cd3586ed971217d65bf56cSteve Naroff AtCatchParent = AtCatchParent->getParent(); 2746e21dd6ffef4585fa43cd3586ed971217d65bf56cSteve Naroff if (!AtCatchParent) 27474ab2414f297fab1b290e77bfc3b049ccf45eda81Steve Naroff return StmtError(Diag(AtLoc, diag::error_rethrow_used_outside_catch)); 2748dfbb02a16ac8c764b5ba1742450513d6212d2f9fNAKAMURA Takumi } 27499ae2f076ca5ab1feb3ba95629099ec2319833701John McCall return BuildObjCAtThrowStmt(AtLoc, Throw); 275039f8f159c488a900e5958d5aab3e467af9ec8a2bFariborz Jahanian} 2751bd49a647afd9cc534fef13cadf652d4e9c396e2bFariborz Jahanian 275207524039dce5c820f111a1b3f772b4261f004b4aJohn McCallExprResult 275307524039dce5c820f111a1b3f772b4261f004b4aJohn McCallSema::ActOnObjCAtSynchronizedOperand(SourceLocation atLoc, Expr *operand) { 275407524039dce5c820f111a1b3f772b4261f004b4aJohn McCall ExprResult result = DefaultLvalueConversion(operand); 275507524039dce5c820f111a1b3f772b4261f004b4aJohn McCall if (result.isInvalid()) 275607524039dce5c820f111a1b3f772b4261f004b4aJohn McCall return ExprError(); 275707524039dce5c820f111a1b3f772b4261f004b4aJohn McCall operand = result.take(); 27585e3c67b4bd894a926282d24b4d0cbc0e123c9f4aJohn McCall 2759a868a203a18571d091e5d226f5f100d4440f3d94Chris Lattner // Make sure the expression type is an ObjC pointer or "void *". 276007524039dce5c820f111a1b3f772b4261f004b4aJohn McCall QualType type = operand->getType(); 276107524039dce5c820f111a1b3f772b4261f004b4aJohn McCall if (!type->isDependentType() && 276207524039dce5c820f111a1b3f772b4261f004b4aJohn McCall !type->isObjCObjectPointerType()) { 276307524039dce5c820f111a1b3f772b4261f004b4aJohn McCall const PointerType *pointerType = type->getAs<PointerType>(); 276407524039dce5c820f111a1b3f772b4261f004b4aJohn McCall if (!pointerType || !pointerType->getPointeeType()->isVoidType()) 276507524039dce5c820f111a1b3f772b4261f004b4aJohn McCall return Diag(atLoc, diag::error_objc_synchronized_expects_object) 276607524039dce5c820f111a1b3f772b4261f004b4aJohn McCall << type << operand->getSourceRange(); 2767a868a203a18571d091e5d226f5f100d4440f3d94Chris Lattner } 27681eb4433ac451dc16f4133a88af2d002ac26c58efMike Stump 276907524039dce5c820f111a1b3f772b4261f004b4aJohn McCall // The operand to @synchronized is a full-expression. 277007524039dce5c820f111a1b3f772b4261f004b4aJohn McCall return MaybeCreateExprWithCleanups(operand); 277107524039dce5c820f111a1b3f772b4261f004b4aJohn McCall} 277207524039dce5c820f111a1b3f772b4261f004b4aJohn McCall 277307524039dce5c820f111a1b3f772b4261f004b4aJohn McCallStmtResult 277407524039dce5c820f111a1b3f772b4261f004b4aJohn McCallSema::ActOnObjCAtSynchronizedStmt(SourceLocation AtLoc, Expr *SyncExpr, 277507524039dce5c820f111a1b3f772b4261f004b4aJohn McCall Stmt *SyncBody) { 277607524039dce5c820f111a1b3f772b4261f004b4aJohn McCall // We can't jump into or indirect-jump out of a @synchronized block. 277707524039dce5c820f111a1b3f772b4261f004b4aJohn McCall getCurFunction()->setHasBranchProtectedScope(); 27789ae2f076ca5ab1feb3ba95629099ec2319833701John McCall return Owned(new (Context) ObjCAtSynchronizedStmt(AtLoc, SyncExpr, SyncBody)); 2779fa3ee8e6776634caf064ba5928ca7699d317a280Fariborz Jahanian} 27804b07b2968f87f3cd5a3d8c76145f1cbfd718d42dSebastian Redl 27814b07b2968f87f3cd5a3d8c76145f1cbfd718d42dSebastian Redl/// ActOnCXXCatchBlock - Takes an exception declaration and a handler block 27824b07b2968f87f3cd5a3d8c76145f1cbfd718d42dSebastian Redl/// and creates a proper catch handler from them. 278360d7b3a319d84d688752be3870615ac0f111fb16John McCallStmtResult 2784d226f65006733ed7f709c3174f22ce33391cb58fJohn McCallSema::ActOnCXXCatchBlock(SourceLocation CatchLoc, Decl *ExDecl, 27859ae2f076ca5ab1feb3ba95629099ec2319833701John McCall Stmt *HandlerBlock) { 27864b07b2968f87f3cd5a3d8c76145f1cbfd718d42dSebastian Redl // There's nothing to test that ActOnExceptionDecl didn't already test. 27878189cde56b4f6f938cd65f53c932fe1860d0204cTed Kremenek return Owned(new (Context) CXXCatchStmt(CatchLoc, 2788d226f65006733ed7f709c3174f22ce33391cb58fJohn McCall cast_or_null<VarDecl>(ExDecl), 27899ae2f076ca5ab1feb3ba95629099ec2319833701John McCall HandlerBlock)); 27904b07b2968f87f3cd5a3d8c76145f1cbfd718d42dSebastian Redl} 27918351da06ca3082dfd49dd8e3c1785a986920f57cSebastian Redl 2792f85e193739c953358c865005855253af4f68a497John McCallStmtResult 2793f85e193739c953358c865005855253af4f68a497John McCallSema::ActOnObjCAutoreleasePoolStmt(SourceLocation AtLoc, Stmt *Body) { 2794f85e193739c953358c865005855253af4f68a497John McCall getCurFunction()->setHasBranchProtectedScope(); 2795f85e193739c953358c865005855253af4f68a497John McCall return Owned(new (Context) ObjCAutoreleasePoolStmt(AtLoc, Body)); 2796f85e193739c953358c865005855253af4f68a497John McCall} 2797f85e193739c953358c865005855253af4f68a497John McCall 27983c46e8db99196179b30e7ac5c20c4efd5f3926d7Dan Gohmannamespace { 27993c46e8db99196179b30e7ac5c20c4efd5f3926d7Dan Gohman 2800c447aba04527a71d254b151f79f444d1cbe83ce9Sebastian Redlclass TypeWithHandler { 2801c447aba04527a71d254b151f79f444d1cbe83ce9Sebastian Redl QualType t; 2802c447aba04527a71d254b151f79f444d1cbe83ce9Sebastian Redl CXXCatchStmt *stmt; 2803c447aba04527a71d254b151f79f444d1cbe83ce9Sebastian Redlpublic: 2804c447aba04527a71d254b151f79f444d1cbe83ce9Sebastian Redl TypeWithHandler(const QualType &type, CXXCatchStmt *statement) 2805c447aba04527a71d254b151f79f444d1cbe83ce9Sebastian Redl : t(type), stmt(statement) {} 2806c447aba04527a71d254b151f79f444d1cbe83ce9Sebastian Redl 28070953e767ff7817f97b3ab20896b229891eeff45bJohn McCall // An arbitrary order is fine as long as it places identical 28080953e767ff7817f97b3ab20896b229891eeff45bJohn McCall // types next to each other. 2809c447aba04527a71d254b151f79f444d1cbe83ce9Sebastian Redl bool operator<(const TypeWithHandler &y) const { 28100953e767ff7817f97b3ab20896b229891eeff45bJohn McCall if (t.getAsOpaquePtr() < y.t.getAsOpaquePtr()) 2811c447aba04527a71d254b151f79f444d1cbe83ce9Sebastian Redl return true; 28120953e767ff7817f97b3ab20896b229891eeff45bJohn McCall if (t.getAsOpaquePtr() > y.t.getAsOpaquePtr()) 2813c447aba04527a71d254b151f79f444d1cbe83ce9Sebastian Redl return false; 2814c447aba04527a71d254b151f79f444d1cbe83ce9Sebastian Redl else 2815c447aba04527a71d254b151f79f444d1cbe83ce9Sebastian Redl return getTypeSpecStartLoc() < y.getTypeSpecStartLoc(); 2816c447aba04527a71d254b151f79f444d1cbe83ce9Sebastian Redl } 28171eb4433ac451dc16f4133a88af2d002ac26c58efMike Stump 2818c447aba04527a71d254b151f79f444d1cbe83ce9Sebastian Redl bool operator==(const TypeWithHandler& other) const { 28190953e767ff7817f97b3ab20896b229891eeff45bJohn McCall return t == other.t; 2820c447aba04527a71d254b151f79f444d1cbe83ce9Sebastian Redl } 28211eb4433ac451dc16f4133a88af2d002ac26c58efMike Stump 2822c447aba04527a71d254b151f79f444d1cbe83ce9Sebastian Redl CXXCatchStmt *getCatchStmt() const { return stmt; } 2823c447aba04527a71d254b151f79f444d1cbe83ce9Sebastian Redl SourceLocation getTypeSpecStartLoc() const { 2824c447aba04527a71d254b151f79f444d1cbe83ce9Sebastian Redl return stmt->getExceptionDecl()->getTypeSpecStartLoc(); 2825c447aba04527a71d254b151f79f444d1cbe83ce9Sebastian Redl } 2826c447aba04527a71d254b151f79f444d1cbe83ce9Sebastian Redl}; 2827c447aba04527a71d254b151f79f444d1cbe83ce9Sebastian Redl 28283c46e8db99196179b30e7ac5c20c4efd5f3926d7Dan Gohman} 28293c46e8db99196179b30e7ac5c20c4efd5f3926d7Dan Gohman 28308351da06ca3082dfd49dd8e3c1785a986920f57cSebastian Redl/// ActOnCXXTryBlock - Takes a try compound-statement and a number of 28318351da06ca3082dfd49dd8e3c1785a986920f57cSebastian Redl/// handlers and creates a try statement from them. 283260d7b3a319d84d688752be3870615ac0f111fb16John McCallStmtResult 28339ae2f076ca5ab1feb3ba95629099ec2319833701John McCallSema::ActOnCXXTryBlock(SourceLocation TryLoc, Stmt *TryBlock, 28348351da06ca3082dfd49dd8e3c1785a986920f57cSebastian Redl MultiStmtArg RawHandlers) { 2835729b853f4bfa83e53c638a06a9dccf83b4e1f720Anders Carlsson // Don't report an error if 'try' is used in system headers. 28364e4d08403ca5cfd4d558fa2936215d3a4e5a528dDavid Blaikie if (!getLangOpts().CXXExceptions && 2837729b853f4bfa83e53c638a06a9dccf83b4e1f720Anders Carlsson !getSourceManager().isInSystemHeader(TryLoc)) 2838729b853f4bfa83e53c638a06a9dccf83b4e1f720Anders Carlsson Diag(TryLoc, diag::err_exceptions_disabled) << "try"; 28397f11d9cf5df1f8ce82af46eabc4ec5cec7d580b0Anders Carlsson 28408351da06ca3082dfd49dd8e3c1785a986920f57cSebastian Redl unsigned NumHandlers = RawHandlers.size(); 28418351da06ca3082dfd49dd8e3c1785a986920f57cSebastian Redl assert(NumHandlers > 0 && 28428351da06ca3082dfd49dd8e3c1785a986920f57cSebastian Redl "The parser shouldn't call this if there are no handlers."); 28439ae2f076ca5ab1feb3ba95629099ec2319833701John McCall Stmt **Handlers = RawHandlers.get(); 28448351da06ca3082dfd49dd8e3c1785a986920f57cSebastian Redl 28455f9e272e632e951b1efe824cd16acb4d96077930Chris Lattner SmallVector<TypeWithHandler, 8> TypesWithHandlers; 28461eb4433ac451dc16f4133a88af2d002ac26c58efMike Stump 28471eb4433ac451dc16f4133a88af2d002ac26c58efMike Stump for (unsigned i = 0; i < NumHandlers; ++i) { 28485f9e272e632e951b1efe824cd16acb4d96077930Chris Lattner CXXCatchStmt *Handler = cast<CXXCatchStmt>(Handlers[i]); 2849c447aba04527a71d254b151f79f444d1cbe83ce9Sebastian Redl if (!Handler->getExceptionDecl()) { 2850c447aba04527a71d254b151f79f444d1cbe83ce9Sebastian Redl if (i < NumHandlers - 1) 2851c447aba04527a71d254b151f79f444d1cbe83ce9Sebastian Redl return StmtError(Diag(Handler->getLocStart(), 2852c447aba04527a71d254b151f79f444d1cbe83ce9Sebastian Redl diag::err_early_catch_all)); 28531eb4433ac451dc16f4133a88af2d002ac26c58efMike Stump 2854c447aba04527a71d254b151f79f444d1cbe83ce9Sebastian Redl continue; 2855c447aba04527a71d254b151f79f444d1cbe83ce9Sebastian Redl } 28561eb4433ac451dc16f4133a88af2d002ac26c58efMike Stump 2857c447aba04527a71d254b151f79f444d1cbe83ce9Sebastian Redl const QualType CaughtType = Handler->getCaughtType(); 2858c447aba04527a71d254b151f79f444d1cbe83ce9Sebastian Redl const QualType CanonicalCaughtType = Context.getCanonicalType(CaughtType); 2859c447aba04527a71d254b151f79f444d1cbe83ce9Sebastian Redl TypesWithHandlers.push_back(TypeWithHandler(CanonicalCaughtType, Handler)); 2860c447aba04527a71d254b151f79f444d1cbe83ce9Sebastian Redl } 2861c447aba04527a71d254b151f79f444d1cbe83ce9Sebastian Redl 2862c447aba04527a71d254b151f79f444d1cbe83ce9Sebastian Redl // Detect handlers for the same type as an earlier one. 2863c447aba04527a71d254b151f79f444d1cbe83ce9Sebastian Redl if (NumHandlers > 1) { 2864c447aba04527a71d254b151f79f444d1cbe83ce9Sebastian Redl llvm::array_pod_sort(TypesWithHandlers.begin(), TypesWithHandlers.end()); 28651eb4433ac451dc16f4133a88af2d002ac26c58efMike Stump 2866c447aba04527a71d254b151f79f444d1cbe83ce9Sebastian Redl TypeWithHandler prev = TypesWithHandlers[0]; 2867c447aba04527a71d254b151f79f444d1cbe83ce9Sebastian Redl for (unsigned i = 1; i < TypesWithHandlers.size(); ++i) { 2868c447aba04527a71d254b151f79f444d1cbe83ce9Sebastian Redl TypeWithHandler curr = TypesWithHandlers[i]; 28691eb4433ac451dc16f4133a88af2d002ac26c58efMike Stump 2870c447aba04527a71d254b151f79f444d1cbe83ce9Sebastian Redl if (curr == prev) { 2871c447aba04527a71d254b151f79f444d1cbe83ce9Sebastian Redl Diag(curr.getTypeSpecStartLoc(), 2872c447aba04527a71d254b151f79f444d1cbe83ce9Sebastian Redl diag::warn_exception_caught_by_earlier_handler) 2873c447aba04527a71d254b151f79f444d1cbe83ce9Sebastian Redl << curr.getCatchStmt()->getCaughtType().getAsString(); 2874c447aba04527a71d254b151f79f444d1cbe83ce9Sebastian Redl Diag(prev.getTypeSpecStartLoc(), 2875c447aba04527a71d254b151f79f444d1cbe83ce9Sebastian Redl diag::note_previous_exception_handler) 2876c447aba04527a71d254b151f79f444d1cbe83ce9Sebastian Redl << prev.getCatchStmt()->getCaughtType().getAsString(); 2877c447aba04527a71d254b151f79f444d1cbe83ce9Sebastian Redl } 28781eb4433ac451dc16f4133a88af2d002ac26c58efMike Stump 2879c447aba04527a71d254b151f79f444d1cbe83ce9Sebastian Redl prev = curr; 2880c447aba04527a71d254b151f79f444d1cbe83ce9Sebastian Redl } 28818351da06ca3082dfd49dd8e3c1785a986920f57cSebastian Redl } 28821eb4433ac451dc16f4133a88af2d002ac26c58efMike Stump 2883781472fe99a120098c631b0cbe33c89f8cef5e70John McCall getCurFunction()->setHasBranchProtectedScope(); 2884b60a77e453d32db0ab1914d28e175c2defc0eb65John McCall 28858351da06ca3082dfd49dd8e3c1785a986920f57cSebastian Redl // FIXME: We should detect handlers that cannot catch anything because an 28868351da06ca3082dfd49dd8e3c1785a986920f57cSebastian Redl // earlier handler catches a superclass. Need to find a method that is not 28878351da06ca3082dfd49dd8e3c1785a986920f57cSebastian Redl // quadratic for this. 28888351da06ca3082dfd49dd8e3c1785a986920f57cSebastian Redl // Neither of these are explicitly forbidden, but every compiler detects them 28898351da06ca3082dfd49dd8e3c1785a986920f57cSebastian Redl // and warns. 28908351da06ca3082dfd49dd8e3c1785a986920f57cSebastian Redl 28919ae2f076ca5ab1feb3ba95629099ec2319833701John McCall return Owned(CXXTryStmt::Create(Context, TryLoc, TryBlock, 2892a1a396df16c02b22983b5c9592022fd9237d4866Sam Weinig Handlers, NumHandlers)); 28938351da06ca3082dfd49dd8e3c1785a986920f57cSebastian Redl} 289428bbe4b8acc338476fe0825769b41fb32b423c72John Wiegley 289528bbe4b8acc338476fe0825769b41fb32b423c72John WiegleyStmtResult 289628bbe4b8acc338476fe0825769b41fb32b423c72John WiegleySema::ActOnSEHTryBlock(bool IsCXXTry, 289728bbe4b8acc338476fe0825769b41fb32b423c72John Wiegley SourceLocation TryLoc, 289828bbe4b8acc338476fe0825769b41fb32b423c72John Wiegley Stmt *TryBlock, 289928bbe4b8acc338476fe0825769b41fb32b423c72John Wiegley Stmt *Handler) { 290028bbe4b8acc338476fe0825769b41fb32b423c72John Wiegley assert(TryBlock && Handler); 290128bbe4b8acc338476fe0825769b41fb32b423c72John Wiegley 290228bbe4b8acc338476fe0825769b41fb32b423c72John Wiegley getCurFunction()->setHasBranchProtectedScope(); 290328bbe4b8acc338476fe0825769b41fb32b423c72John Wiegley 290428bbe4b8acc338476fe0825769b41fb32b423c72John Wiegley return Owned(SEHTryStmt::Create(Context,IsCXXTry,TryLoc,TryBlock,Handler)); 290528bbe4b8acc338476fe0825769b41fb32b423c72John Wiegley} 290628bbe4b8acc338476fe0825769b41fb32b423c72John Wiegley 290728bbe4b8acc338476fe0825769b41fb32b423c72John WiegleyStmtResult 290828bbe4b8acc338476fe0825769b41fb32b423c72John WiegleySema::ActOnSEHExceptBlock(SourceLocation Loc, 290928bbe4b8acc338476fe0825769b41fb32b423c72John Wiegley Expr *FilterExpr, 291028bbe4b8acc338476fe0825769b41fb32b423c72John Wiegley Stmt *Block) { 291128bbe4b8acc338476fe0825769b41fb32b423c72John Wiegley assert(FilterExpr && Block); 291228bbe4b8acc338476fe0825769b41fb32b423c72John Wiegley 291328bbe4b8acc338476fe0825769b41fb32b423c72John Wiegley if(!FilterExpr->getType()->isIntegerType()) { 291458f14c012e5d739b09532bb12645dc161f88cfcfFrancois Pichet return StmtError(Diag(FilterExpr->getExprLoc(), 291558f14c012e5d739b09532bb12645dc161f88cfcfFrancois Pichet diag::err_filter_expression_integral) 291658f14c012e5d739b09532bb12645dc161f88cfcfFrancois Pichet << FilterExpr->getType()); 291728bbe4b8acc338476fe0825769b41fb32b423c72John Wiegley } 291828bbe4b8acc338476fe0825769b41fb32b423c72John Wiegley 291928bbe4b8acc338476fe0825769b41fb32b423c72John Wiegley return Owned(SEHExceptStmt::Create(Context,Loc,FilterExpr,Block)); 292028bbe4b8acc338476fe0825769b41fb32b423c72John Wiegley} 292128bbe4b8acc338476fe0825769b41fb32b423c72John Wiegley 292228bbe4b8acc338476fe0825769b41fb32b423c72John WiegleyStmtResult 292328bbe4b8acc338476fe0825769b41fb32b423c72John WiegleySema::ActOnSEHFinallyBlock(SourceLocation Loc, 292428bbe4b8acc338476fe0825769b41fb32b423c72John Wiegley Stmt *Block) { 292528bbe4b8acc338476fe0825769b41fb32b423c72John Wiegley assert(Block); 292628bbe4b8acc338476fe0825769b41fb32b423c72John Wiegley return Owned(SEHFinallyStmt::Create(Context,Loc,Block)); 292728bbe4b8acc338476fe0825769b41fb32b423c72John Wiegley} 2928ba0513de93d2fab6db5ab30b6927209fcc883078Douglas Gregor 2929ba0513de93d2fab6db5ab30b6927209fcc883078Douglas GregorStmtResult Sema::BuildMSDependentExistsStmt(SourceLocation KeywordLoc, 2930ba0513de93d2fab6db5ab30b6927209fcc883078Douglas Gregor bool IsIfExists, 2931ba0513de93d2fab6db5ab30b6927209fcc883078Douglas Gregor NestedNameSpecifierLoc QualifierLoc, 2932ba0513de93d2fab6db5ab30b6927209fcc883078Douglas Gregor DeclarationNameInfo NameInfo, 2933ba0513de93d2fab6db5ab30b6927209fcc883078Douglas Gregor Stmt *Nested) 2934ba0513de93d2fab6db5ab30b6927209fcc883078Douglas Gregor{ 2935ba0513de93d2fab6db5ab30b6927209fcc883078Douglas Gregor return new (Context) MSDependentExistsStmt(KeywordLoc, IsIfExists, 2936ba0513de93d2fab6db5ab30b6927209fcc883078Douglas Gregor QualifierLoc, NameInfo, 2937ba0513de93d2fab6db5ab30b6927209fcc883078Douglas Gregor cast<CompoundStmt>(Nested)); 2938ba0513de93d2fab6db5ab30b6927209fcc883078Douglas Gregor} 2939ba0513de93d2fab6db5ab30b6927209fcc883078Douglas Gregor 2940ba0513de93d2fab6db5ab30b6927209fcc883078Douglas Gregor 2941ba0513de93d2fab6db5ab30b6927209fcc883078Douglas GregorStmtResult Sema::ActOnMSDependentExistsStmt(SourceLocation KeywordLoc, 2942ba0513de93d2fab6db5ab30b6927209fcc883078Douglas Gregor bool IsIfExists, 2943ba0513de93d2fab6db5ab30b6927209fcc883078Douglas Gregor CXXScopeSpec &SS, 2944ba0513de93d2fab6db5ab30b6927209fcc883078Douglas Gregor UnqualifiedId &Name, 2945ba0513de93d2fab6db5ab30b6927209fcc883078Douglas Gregor Stmt *Nested) { 2946ba0513de93d2fab6db5ab30b6927209fcc883078Douglas Gregor return BuildMSDependentExistsStmt(KeywordLoc, IsIfExists, 2947ba0513de93d2fab6db5ab30b6927209fcc883078Douglas Gregor SS.getWithLocInContext(Context), 2948ba0513de93d2fab6db5ab30b6927209fcc883078Douglas Gregor GetNameFromUnqualifiedId(Name), 2949ba0513de93d2fab6db5ab30b6927209fcc883078Douglas Gregor Nested); 2950ba0513de93d2fab6db5ab30b6927209fcc883078Douglas Gregor} 2951