SemaStmt.cpp revision 793cd1c4cdfaafc52e2c2ad9dae959befe4bb166
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" 2284fb9c0be621c9e4ca4e56f67dae2a0bb6e44821Douglas Gregor#include "clang/AST/ExprCXX.h" 23419cfb318cd69b6c717019288d5a3822be18d8f9Chris Lattner#include "clang/AST/ExprObjC.h" 2416f0049415ec596504891259e2a83e19871c0d52Chris Lattner#include "clang/AST/StmtObjC.h" 2516f0049415ec596504891259e2a83e19871c0d52Chris Lattner#include "clang/AST/StmtCXX.h" 26209acbd6d0c1b4444eb8c1682717753e1cbe38deJohn McCall#include "clang/AST/TypeLoc.h" 2784fb9c0be621c9e4ca4e56f67dae2a0bb6e44821Douglas Gregor#include "clang/Lex/Preprocessor.h" 286fa9086043b0338d895a4cdb0ec8542530af90d7Anders Carlsson#include "clang/Basic/TargetInfo.h" 29ca57b4b7658a031b74cda5ac504311998be8e343Chris Lattner#include "llvm/ADT/ArrayRef.h" 30c447aba04527a71d254b151f79f444d1cbe83ce9Sebastian Redl#include "llvm/ADT/STLExtras.h" 31c447aba04527a71d254b151f79f444d1cbe83ce9Sebastian Redl#include "llvm/ADT/SmallVector.h" 325f016e2cb5d11daeb237544de1c5d59f20fe1a6eReid Spencerusing namespace clang; 33781472fe99a120098c631b0cbe33c89f8cef5e70John McCallusing namespace sema; 345f016e2cb5d11daeb237544de1c5d59f20fe1a6eReid Spencer 3560d7b3a319d84d688752be3870615ac0f111fb16John McCallStmtResult Sema::ActOnExprStmt(FullExprArg expr) { 369ae2f076ca5ab1feb3ba95629099ec2319833701John McCall Expr *E = expr.get(); 37bebbe0d9b7568ce43a464286bee49429489ef483Douglas Gregor if (!E) // FIXME: FullExprArg has no error state? 38bebbe0d9b7568ce43a464286bee49429489ef483Douglas Gregor return StmtError(); 39bebbe0d9b7568ce43a464286bee49429489ef483Douglas Gregor 40834a72ac74cf4ff07ba6215545dba3db578f8a07Chris Lattner // C99 6.8.3p2: The expression in an expression statement is evaluated as a 41834a72ac74cf4ff07ba6215545dba3db578f8a07Chris Lattner // void expression for its side effects. Conversion to void allows any 42834a72ac74cf4ff07ba6215545dba3db578f8a07Chris Lattner // operand, even incomplete types. 43a60528cdac7deee3991c2b48af4df4f315e49e9dSebastian Redl 44834a72ac74cf4ff07ba6215545dba3db578f8a07Chris Lattner // Same thing in for stmt first clause (when expr) and third clause. 45a60528cdac7deee3991c2b48af4df4f315e49e9dSebastian Redl return Owned(static_cast<Stmt*>(E)); 465f016e2cb5d11daeb237544de1c5d59f20fe1a6eReid Spencer} 475f016e2cb5d11daeb237544de1c5d59f20fe1a6eReid Spencer 485f016e2cb5d11daeb237544de1c5d59f20fe1a6eReid Spencer 49b7d98d35ea723624345f06e5895ddce2e0388ef0Argyrios KyrtzidisStmtResult Sema::ActOnNullStmt(SourceLocation SemiLoc, 50e2ca828119b8bff4a5c25c6db8ee4fec558451e7Argyrios Kyrtzidis bool HasLeadingEmptyMacro) { 51e2ca828119b8bff4a5c25c6db8ee4fec558451e7Argyrios Kyrtzidis return Owned(new (Context) NullStmt(SemiLoc, HasLeadingEmptyMacro)); 525f016e2cb5d11daeb237544de1c5d59f20fe1a6eReid Spencer} 535f016e2cb5d11daeb237544de1c5d59f20fe1a6eReid Spencer 54337e550218128e7d922c09bb354fbc71de90c568Chris LattnerStmtResult Sema::ActOnDeclStmt(DeclGroupPtrTy dg, SourceLocation StartLoc, 55337e550218128e7d922c09bb354fbc71de90c568Chris Lattner SourceLocation EndLoc) { 5620401698e3bd93a24bb5d9e18e435895cefe5fd1Chris Lattner DeclGroupRef DG = dg.getAsVal<DeclGroupRef>(); 571eb4433ac451dc16f4133a88af2d002ac26c58efMike Stump 58682bf92db408a6cbc3d37b5496a99b6ef85041ecChris Lattner // If we have an invalid decl, just return an error. 5920401698e3bd93a24bb5d9e18e435895cefe5fd1Chris Lattner if (DG.isNull()) return StmtError(); 601eb4433ac451dc16f4133a88af2d002ac26c58efMike Stump 6124e1e707b4c362f18e371e2bbf054a8345b57bfaChris Lattner return Owned(new (Context) DeclStmt(DG, StartLoc, EndLoc)); 625f016e2cb5d11daeb237544de1c5d59f20fe1a6eReid Spencer} 635f016e2cb5d11daeb237544de1c5d59f20fe1a6eReid Spencer 64a7cf23a72b0846fc5aacf3f38bb8c8f9e76784cfFariborz Jahanianvoid Sema::ActOnForEachDeclStmt(DeclGroupPtrTy dg) { 65a7cf23a72b0846fc5aacf3f38bb8c8f9e76784cfFariborz Jahanian DeclGroupRef DG = dg.getAsVal<DeclGroupRef>(); 66dfbb02a16ac8c764b5ba1742450513d6212d2f9fNAKAMURA Takumi 67a7cf23a72b0846fc5aacf3f38bb8c8f9e76784cfFariborz Jahanian // If we have an invalid decl, just return. 68a7cf23a72b0846fc5aacf3f38bb8c8f9e76784cfFariborz Jahanian if (DG.isNull() || !DG.isSingleDecl()) return; 69f85e193739c953358c865005855253af4f68a497John McCall VarDecl *var = cast<VarDecl>(DG.getSingleDecl()); 70f85e193739c953358c865005855253af4f68a497John McCall 71a7cf23a72b0846fc5aacf3f38bb8c8f9e76784cfFariborz Jahanian // suppress any potential 'unused variable' warning. 72f85e193739c953358c865005855253af4f68a497John McCall var->setUsed(); 73f85e193739c953358c865005855253af4f68a497John McCall 747acddacc921cd0b3f813443a8641eeddb82dfbd4John McCall // foreach variables are never actually initialized in the way that 757acddacc921cd0b3f813443a8641eeddb82dfbd4John McCall // the parser came up with. 767acddacc921cd0b3f813443a8641eeddb82dfbd4John McCall var->setInit(0); 777acddacc921cd0b3f813443a8641eeddb82dfbd4John McCall 787acddacc921cd0b3f813443a8641eeddb82dfbd4John McCall // In ARC, we don't need to retain the iteration variable of a fast 797acddacc921cd0b3f813443a8641eeddb82dfbd4John McCall // enumeration loop. Rather than actually trying to catch that 807acddacc921cd0b3f813443a8641eeddb82dfbd4John McCall // during declaration processing, we remove the consequences here. 81f85e193739c953358c865005855253af4f68a497John McCall if (getLangOptions().ObjCAutoRefCount) { 827acddacc921cd0b3f813443a8641eeddb82dfbd4John McCall QualType type = var->getType(); 837acddacc921cd0b3f813443a8641eeddb82dfbd4John McCall 847acddacc921cd0b3f813443a8641eeddb82dfbd4John McCall // Only do this if we inferred the lifetime. Inferred lifetime 857acddacc921cd0b3f813443a8641eeddb82dfbd4John McCall // will show up as a local qualifier because explicit lifetime 867acddacc921cd0b3f813443a8641eeddb82dfbd4John McCall // should have shown up as an AttributedType instead. 877acddacc921cd0b3f813443a8641eeddb82dfbd4John McCall if (type.getLocalQualifiers().getObjCLifetime() == Qualifiers::OCL_Strong) { 887acddacc921cd0b3f813443a8641eeddb82dfbd4John McCall // Add 'const' and mark the variable as pseudo-strong. 897acddacc921cd0b3f813443a8641eeddb82dfbd4John McCall var->setType(type.withConst()); 907acddacc921cd0b3f813443a8641eeddb82dfbd4John McCall var->setARCPseudoStrong(true); 91f85e193739c953358c865005855253af4f68a497John McCall } 92f85e193739c953358c865005855253af4f68a497John McCall } 93a7cf23a72b0846fc5aacf3f38bb8c8f9e76784cfFariborz Jahanian} 94a7cf23a72b0846fc5aacf3f38bb8c8f9e76784cfFariborz Jahanian 95ec8058f64bbcd79bd47748f4cf8628123dd3bae6Chandler Carruth/// \brief Diagnose unused '==' and '!=' as likely typos for '=' or '|='. 969d8eb3b2a892697aed332f6c318a8554fc2623ceChandler Carruth/// 979d8eb3b2a892697aed332f6c318a8554fc2623ceChandler Carruth/// Adding a cast to void (or other expression wrappers) will prevent the 989d8eb3b2a892697aed332f6c318a8554fc2623ceChandler Carruth/// warning from firing. 99ec8058f64bbcd79bd47748f4cf8628123dd3bae6Chandler Carruthstatic bool DiagnoseUnusedComparison(Sema &S, const Expr *E) { 1009d8eb3b2a892697aed332f6c318a8554fc2623ceChandler Carruth SourceLocation Loc; 10150bf68fc9698742e36c311fc37e6e4b7de235c4bChandler Carruth bool IsNotEqual, CanAssign; 1029d8eb3b2a892697aed332f6c318a8554fc2623ceChandler Carruth 1039d8eb3b2a892697aed332f6c318a8554fc2623ceChandler Carruth if (const BinaryOperator *Op = dyn_cast<BinaryOperator>(E)) { 1049d8eb3b2a892697aed332f6c318a8554fc2623ceChandler Carruth if (Op->getOpcode() != BO_EQ && Op->getOpcode() != BO_NE) 105ec8058f64bbcd79bd47748f4cf8628123dd3bae6Chandler Carruth return false; 1069d8eb3b2a892697aed332f6c318a8554fc2623ceChandler Carruth 1079d8eb3b2a892697aed332f6c318a8554fc2623ceChandler Carruth Loc = Op->getOperatorLoc(); 10850bf68fc9698742e36c311fc37e6e4b7de235c4bChandler Carruth IsNotEqual = Op->getOpcode() == BO_NE; 10950bf68fc9698742e36c311fc37e6e4b7de235c4bChandler Carruth CanAssign = Op->getLHS()->IgnoreParenImpCasts()->isLValue(); 1109d8eb3b2a892697aed332f6c318a8554fc2623ceChandler Carruth } else if (const CXXOperatorCallExpr *Op = dyn_cast<CXXOperatorCallExpr>(E)) { 1119d8eb3b2a892697aed332f6c318a8554fc2623ceChandler Carruth if (Op->getOperator() != OO_EqualEqual && 1129d8eb3b2a892697aed332f6c318a8554fc2623ceChandler Carruth Op->getOperator() != OO_ExclaimEqual) 113ec8058f64bbcd79bd47748f4cf8628123dd3bae6Chandler Carruth return false; 1149d8eb3b2a892697aed332f6c318a8554fc2623ceChandler Carruth 1159d8eb3b2a892697aed332f6c318a8554fc2623ceChandler Carruth Loc = Op->getOperatorLoc(); 11650bf68fc9698742e36c311fc37e6e4b7de235c4bChandler Carruth IsNotEqual = Op->getOperator() == OO_ExclaimEqual; 11750bf68fc9698742e36c311fc37e6e4b7de235c4bChandler Carruth CanAssign = Op->getArg(0)->IgnoreParenImpCasts()->isLValue(); 1189d8eb3b2a892697aed332f6c318a8554fc2623ceChandler Carruth } else { 1199d8eb3b2a892697aed332f6c318a8554fc2623ceChandler Carruth // Not a typo-prone comparison. 120ec8058f64bbcd79bd47748f4cf8628123dd3bae6Chandler Carruth return false; 1219d8eb3b2a892697aed332f6c318a8554fc2623ceChandler Carruth } 1229d8eb3b2a892697aed332f6c318a8554fc2623ceChandler Carruth 1239d8eb3b2a892697aed332f6c318a8554fc2623ceChandler Carruth // Suppress warnings when the operator, suspicious as it may be, comes from 1249d8eb3b2a892697aed332f6c318a8554fc2623ceChandler Carruth // a macro expansion. 1259d8eb3b2a892697aed332f6c318a8554fc2623ceChandler Carruth if (Loc.isMacroID()) 126ec8058f64bbcd79bd47748f4cf8628123dd3bae6Chandler Carruth return false; 1279d8eb3b2a892697aed332f6c318a8554fc2623ceChandler Carruth 128ec8058f64bbcd79bd47748f4cf8628123dd3bae6Chandler Carruth S.Diag(Loc, diag::warn_unused_comparison) 1299d8eb3b2a892697aed332f6c318a8554fc2623ceChandler Carruth << (unsigned)IsNotEqual << E->getSourceRange(); 1309d8eb3b2a892697aed332f6c318a8554fc2623ceChandler Carruth 13150bf68fc9698742e36c311fc37e6e4b7de235c4bChandler Carruth // If the LHS is a plausible entity to assign to, provide a fixit hint to 13250bf68fc9698742e36c311fc37e6e4b7de235c4bChandler Carruth // correct common typos. 13350bf68fc9698742e36c311fc37e6e4b7de235c4bChandler Carruth if (CanAssign) { 13450bf68fc9698742e36c311fc37e6e4b7de235c4bChandler Carruth if (IsNotEqual) 13550bf68fc9698742e36c311fc37e6e4b7de235c4bChandler Carruth S.Diag(Loc, diag::note_inequality_comparison_to_or_assign) 13650bf68fc9698742e36c311fc37e6e4b7de235c4bChandler Carruth << FixItHint::CreateReplacement(Loc, "|="); 13750bf68fc9698742e36c311fc37e6e4b7de235c4bChandler Carruth else 13850bf68fc9698742e36c311fc37e6e4b7de235c4bChandler Carruth S.Diag(Loc, diag::note_equality_comparison_to_assign) 13950bf68fc9698742e36c311fc37e6e4b7de235c4bChandler Carruth << FixItHint::CreateReplacement(Loc, "="); 14050bf68fc9698742e36c311fc37e6e4b7de235c4bChandler Carruth } 141ec8058f64bbcd79bd47748f4cf8628123dd3bae6Chandler Carruth 142ec8058f64bbcd79bd47748f4cf8628123dd3bae6Chandler Carruth return true; 1439d8eb3b2a892697aed332f6c318a8554fc2623ceChandler Carruth} 1449d8eb3b2a892697aed332f6c318a8554fc2623ceChandler Carruth 145636463e4c43be15e2f0fd0b8a08667f3066d8af7Anders Carlssonvoid Sema::DiagnoseUnusedExprResult(const Stmt *S) { 146d2827af6f96d441d72315dbe6d8505c3be0f2aa6Argyrios Kyrtzidis if (const LabelStmt *Label = dyn_cast_or_null<LabelStmt>(S)) 147d2827af6f96d441d72315dbe6d8505c3be0f2aa6Argyrios Kyrtzidis return DiagnoseUnusedExprResult(Label->getSubStmt()); 148d2827af6f96d441d72315dbe6d8505c3be0f2aa6Argyrios Kyrtzidis 149754431107b61a0523df5271c2876a73dd5a051e9Anders Carlsson const Expr *E = dyn_cast_or_null<Expr>(S); 150636463e4c43be15e2f0fd0b8a08667f3066d8af7Anders Carlsson if (!E) 151636463e4c43be15e2f0fd0b8a08667f3066d8af7Anders Carlsson return; 152636463e4c43be15e2f0fd0b8a08667f3066d8af7Anders Carlsson 153636463e4c43be15e2f0fd0b8a08667f3066d8af7Anders Carlsson SourceLocation Loc; 154636463e4c43be15e2f0fd0b8a08667f3066d8af7Anders Carlsson SourceRange R1, R2; 155d87a0cd2b3e1c9e9f01212875f4cbe5b7bb7ab57Matt Beaumont-Gay if (SourceMgr.isInSystemMacro(E->getExprLoc()) || 156d87a0cd2b3e1c9e9f01212875f4cbe5b7bb7ab57Matt Beaumont-Gay !E->isUnusedResultAWarning(Loc, R1, R2, Context)) 157636463e4c43be15e2f0fd0b8a08667f3066d8af7Anders Carlsson return; 1581eb4433ac451dc16f4133a88af2d002ac26c58efMike Stump 159419cfb318cd69b6c717019288d5a3822be18d8f9Chris Lattner // Okay, we have an unused result. Depending on what the base expression is, 160419cfb318cd69b6c717019288d5a3822be18d8f9Chris Lattner // we might want to make a more specific diagnostic. Check for one of these 161419cfb318cd69b6c717019288d5a3822be18d8f9Chris Lattner // cases now. 162419cfb318cd69b6c717019288d5a3822be18d8f9Chris Lattner unsigned DiagID = diag::warn_unused_expr; 1634765fa05b5652fcc4356371c2f481d0ea9a1b007John McCall if (const ExprWithCleanups *Temps = dyn_cast<ExprWithCleanups>(E)) 1644dffad64c5c7106dc5ac506be94944299c8f7bc3Douglas Gregor E = Temps->getSubExpr(); 16534d49471e0b6386aefdc0f6bd15e4a4876ce5db1Chandler Carruth if (const CXXBindTemporaryExpr *TempExpr = dyn_cast<CXXBindTemporaryExpr>(E)) 16634d49471e0b6386aefdc0f6bd15e4a4876ce5db1Chandler Carruth E = TempExpr->getSubExpr(); 16712f78a6741a4cb3d904340f8d3d2714568b50e7aJohn McCall 168ec8058f64bbcd79bd47748f4cf8628123dd3bae6Chandler Carruth if (DiagnoseUnusedComparison(*this, E)) 169ec8058f64bbcd79bd47748f4cf8628123dd3bae6Chandler Carruth return; 170ec8058f64bbcd79bd47748f4cf8628123dd3bae6Chandler Carruth 171f6a1648197562e0b133440d612d9af297d0a86ccJohn McCall E = E->IgnoreParenImpCasts(); 172bc8d42c6f1565c0b2f93ad524edebfd7a4e6cac6Chris Lattner if (const CallExpr *CE = dyn_cast<CallExpr>(E)) { 1730faede6f31b07bcec7b776f2b420c3ea9bb3e58cJohn McCall if (E->getType()->isVoidType()) 1740faede6f31b07bcec7b776f2b420c3ea9bb3e58cJohn McCall return; 1750faede6f31b07bcec7b776f2b420c3ea9bb3e58cJohn McCall 176bc8d42c6f1565c0b2f93ad524edebfd7a4e6cac6Chris Lattner // If the callee has attribute pure, const, or warn_unused_result, warn with 177bc8d42c6f1565c0b2f93ad524edebfd7a4e6cac6Chris Lattner // a more specific message to make it clear what is happening. 178d20254f2875d0004c57ee766f258dbcee29f4841Nuno Lopes if (const Decl *FD = CE->getCalleeDecl()) { 179bc8d42c6f1565c0b2f93ad524edebfd7a4e6cac6Chris Lattner if (FD->getAttr<WarnUnusedResultAttr>()) { 18042d7b2d25b6f90dc397886d05502b10ab5a8b51bMatt Beaumont-Gay Diag(Loc, diag::warn_unused_result) << R1 << R2; 181bc8d42c6f1565c0b2f93ad524edebfd7a4e6cac6Chris Lattner return; 182bc8d42c6f1565c0b2f93ad524edebfd7a4e6cac6Chris Lattner } 183bc8d42c6f1565c0b2f93ad524edebfd7a4e6cac6Chris Lattner if (FD->getAttr<PureAttr>()) { 184bc8d42c6f1565c0b2f93ad524edebfd7a4e6cac6Chris Lattner Diag(Loc, diag::warn_unused_call) << R1 << R2 << "pure"; 185bc8d42c6f1565c0b2f93ad524edebfd7a4e6cac6Chris Lattner return; 186bc8d42c6f1565c0b2f93ad524edebfd7a4e6cac6Chris Lattner } 187bc8d42c6f1565c0b2f93ad524edebfd7a4e6cac6Chris Lattner if (FD->getAttr<ConstAttr>()) { 188bc8d42c6f1565c0b2f93ad524edebfd7a4e6cac6Chris Lattner Diag(Loc, diag::warn_unused_call) << R1 << R2 << "const"; 189bc8d42c6f1565c0b2f93ad524edebfd7a4e6cac6Chris Lattner return; 190bc8d42c6f1565c0b2f93ad524edebfd7a4e6cac6Chris Lattner } 191dfbb02a16ac8c764b5ba1742450513d6212d2f9fNAKAMURA Takumi } 19212f78a6741a4cb3d904340f8d3d2714568b50e7aJohn McCall } else if (const ObjCMessageExpr *ME = dyn_cast<ObjCMessageExpr>(E)) { 193f85e193739c953358c865005855253af4f68a497John McCall if (getLangOptions().ObjCAutoRefCount && ME->isDelegateInitCall()) { 194f85e193739c953358c865005855253af4f68a497John McCall Diag(Loc, diag::err_arc_unused_init_message) << R1; 195f85e193739c953358c865005855253af4f68a497John McCall return; 196f85e193739c953358c865005855253af4f68a497John McCall } 197f031774aa2638b4d3f487e7e44180c1f89b867efFariborz Jahanian const ObjCMethodDecl *MD = ME->getMethodDecl(); 198f031774aa2638b4d3f487e7e44180c1f89b867efFariborz Jahanian if (MD && MD->getAttr<WarnUnusedResultAttr>()) { 19942d7b2d25b6f90dc397886d05502b10ab5a8b51bMatt Beaumont-Gay Diag(Loc, diag::warn_unused_result) << R1 << R2; 200f031774aa2638b4d3f487e7e44180c1f89b867efFariborz Jahanian return; 201f031774aa2638b4d3f487e7e44180c1f89b867efFariborz Jahanian } 2024b9c2d235fb9449e249d74f48ecfec601650de93John McCall } else if (isa<PseudoObjectExpr>(E)) { 20312f78a6741a4cb3d904340f8d3d2714568b50e7aJohn McCall DiagID = diag::warn_unused_property_expr; 204d6e44a3c4193bd422bfa78c8086fb16bb2168e34Douglas Gregor } else if (const CXXFunctionalCastExpr *FC 205d6e44a3c4193bd422bfa78c8086fb16bb2168e34Douglas Gregor = dyn_cast<CXXFunctionalCastExpr>(E)) { 206d6e44a3c4193bd422bfa78c8086fb16bb2168e34Douglas Gregor if (isa<CXXConstructExpr>(FC->getSubExpr()) || 207d6e44a3c4193bd422bfa78c8086fb16bb2168e34Douglas Gregor isa<CXXTemporaryObjectExpr>(FC->getSubExpr())) 208d6e44a3c4193bd422bfa78c8086fb16bb2168e34Douglas Gregor return; 209f031774aa2638b4d3f487e7e44180c1f89b867efFariborz Jahanian } 210209acbd6d0c1b4444eb8c1682717753e1cbe38deJohn McCall // Diagnose "(void*) blah" as a typo for "(void) blah". 211209acbd6d0c1b4444eb8c1682717753e1cbe38deJohn McCall else if (const CStyleCastExpr *CE = dyn_cast<CStyleCastExpr>(E)) { 212209acbd6d0c1b4444eb8c1682717753e1cbe38deJohn McCall TypeSourceInfo *TI = CE->getTypeInfoAsWritten(); 213209acbd6d0c1b4444eb8c1682717753e1cbe38deJohn McCall QualType T = TI->getType(); 214209acbd6d0c1b4444eb8c1682717753e1cbe38deJohn McCall 215209acbd6d0c1b4444eb8c1682717753e1cbe38deJohn McCall // We really do want to use the non-canonical type here. 216209acbd6d0c1b4444eb8c1682717753e1cbe38deJohn McCall if (T == Context.VoidPtrTy) { 217209acbd6d0c1b4444eb8c1682717753e1cbe38deJohn McCall PointerTypeLoc TL = cast<PointerTypeLoc>(TI->getTypeLoc()); 218209acbd6d0c1b4444eb8c1682717753e1cbe38deJohn McCall 219209acbd6d0c1b4444eb8c1682717753e1cbe38deJohn McCall Diag(Loc, diag::warn_unused_voidptr) 220209acbd6d0c1b4444eb8c1682717753e1cbe38deJohn McCall << FixItHint::CreateRemoval(TL.getStarLoc()); 221209acbd6d0c1b4444eb8c1682717753e1cbe38deJohn McCall return; 222209acbd6d0c1b4444eb8c1682717753e1cbe38deJohn McCall } 223209acbd6d0c1b4444eb8c1682717753e1cbe38deJohn McCall } 224209acbd6d0c1b4444eb8c1682717753e1cbe38deJohn McCall 225351ba91eaa6d30e523587b2d7ed676a5172c6e56Ted Kremenek DiagRuntimeBehavior(Loc, 0, PDiag(DiagID) << R1 << R2); 226636463e4c43be15e2f0fd0b8a08667f3066d8af7Anders Carlsson} 227636463e4c43be15e2f0fd0b8a08667f3066d8af7Anders Carlsson 228625bb569df0c34feec0d52c0ec5215f21ef2e054Dmitri Gribenkovoid Sema::ActOnStartOfCompoundStmt() { 229625bb569df0c34feec0d52c0ec5215f21ef2e054Dmitri Gribenko PushCompoundScope(); 230625bb569df0c34feec0d52c0ec5215f21ef2e054Dmitri Gribenko} 231625bb569df0c34feec0d52c0ec5215f21ef2e054Dmitri Gribenko 232625bb569df0c34feec0d52c0ec5215f21ef2e054Dmitri Gribenkovoid Sema::ActOnFinishOfCompoundStmt() { 233625bb569df0c34feec0d52c0ec5215f21ef2e054Dmitri Gribenko PopCompoundScope(); 234625bb569df0c34feec0d52c0ec5215f21ef2e054Dmitri Gribenko} 235625bb569df0c34feec0d52c0ec5215f21ef2e054Dmitri Gribenko 236625bb569df0c34feec0d52c0ec5215f21ef2e054Dmitri Gribenkosema::CompoundScopeInfo &Sema::getCurCompoundScope() const { 237625bb569df0c34feec0d52c0ec5215f21ef2e054Dmitri Gribenko return getCurFunction()->CompoundScopes.back(); 238625bb569df0c34feec0d52c0ec5215f21ef2e054Dmitri Gribenko} 239625bb569df0c34feec0d52c0ec5215f21ef2e054Dmitri Gribenko 24060d7b3a319d84d688752be3870615ac0f111fb16John McCallStmtResult 2411b273c403734d343d720acb28f04011807c8aa56Steve NaroffSema::ActOnCompoundStmt(SourceLocation L, SourceLocation R, 242a60528cdac7deee3991c2b48af4df4f315e49e9dSebastian Redl MultiStmtArg elts, bool isStmtExpr) { 243a60528cdac7deee3991c2b48af4df4f315e49e9dSebastian Redl unsigned NumElts = elts.size(); 244a60528cdac7deee3991c2b48af4df4f315e49e9dSebastian Redl Stmt **Elts = reinterpret_cast<Stmt**>(elts.release()); 245c30ebfbf23d6a471146e3c68c2cf7f170b7e55dcChris Lattner // If we're in C89 mode, check that we don't have any decls after stmts. If 246c30ebfbf23d6a471146e3c68c2cf7f170b7e55dcChris Lattner // so, emit an extension diagnostic. 247c30ebfbf23d6a471146e3c68c2cf7f170b7e55dcChris Lattner if (!getLangOptions().C99 && !getLangOptions().CPlusPlus) { 248c30ebfbf23d6a471146e3c68c2cf7f170b7e55dcChris Lattner // Note that __extension__ can be around a decl. 249c30ebfbf23d6a471146e3c68c2cf7f170b7e55dcChris Lattner unsigned i = 0; 250c30ebfbf23d6a471146e3c68c2cf7f170b7e55dcChris Lattner // Skip over all declarations. 251c30ebfbf23d6a471146e3c68c2cf7f170b7e55dcChris Lattner for (; i != NumElts && isa<DeclStmt>(Elts[i]); ++i) 252c30ebfbf23d6a471146e3c68c2cf7f170b7e55dcChris Lattner /*empty*/; 253c30ebfbf23d6a471146e3c68c2cf7f170b7e55dcChris Lattner 254c30ebfbf23d6a471146e3c68c2cf7f170b7e55dcChris Lattner // We found the end of the list or a statement. Scan for another declstmt. 255c30ebfbf23d6a471146e3c68c2cf7f170b7e55dcChris Lattner for (; i != NumElts && !isa<DeclStmt>(Elts[i]); ++i) 256c30ebfbf23d6a471146e3c68c2cf7f170b7e55dcChris Lattner /*empty*/; 2571eb4433ac451dc16f4133a88af2d002ac26c58efMike Stump 258c30ebfbf23d6a471146e3c68c2cf7f170b7e55dcChris Lattner if (i != NumElts) { 2594afa39deaa245592977136d367251ee2c173dd8dDouglas Gregor Decl *D = *cast<DeclStmt>(Elts[i])->decl_begin(); 260c30ebfbf23d6a471146e3c68c2cf7f170b7e55dcChris Lattner Diag(D->getLocation(), diag::ext_mixed_decls_code); 261c30ebfbf23d6a471146e3c68c2cf7f170b7e55dcChris Lattner } 262c30ebfbf23d6a471146e3c68c2cf7f170b7e55dcChris Lattner } 26398414c1b7d1944a57156d52e29bd41c005de09acChris Lattner // Warn about unused expressions in statements. 26498414c1b7d1944a57156d52e29bd41c005de09acChris Lattner for (unsigned i = 0; i != NumElts; ++i) { 265636463e4c43be15e2f0fd0b8a08667f3066d8af7Anders Carlsson // Ignore statements that are last in a statement expression. 266636463e4c43be15e2f0fd0b8a08667f3066d8af7Anders Carlsson if (isStmtExpr && i == NumElts - 1) 26798414c1b7d1944a57156d52e29bd41c005de09acChris Lattner continue; 2681eb4433ac451dc16f4133a88af2d002ac26c58efMike Stump 269636463e4c43be15e2f0fd0b8a08667f3066d8af7Anders Carlsson DiagnoseUnusedExprResult(Elts[i]); 27098414c1b7d1944a57156d52e29bd41c005de09acChris Lattner } 271a60528cdac7deee3991c2b48af4df4f315e49e9dSebastian Redl 272625bb569df0c34feec0d52c0ec5215f21ef2e054Dmitri Gribenko // Check for suspicious empty body (null statement) in `for' and `while' 273625bb569df0c34feec0d52c0ec5215f21ef2e054Dmitri Gribenko // statements. Don't do anything for template instantiations, this just adds 274625bb569df0c34feec0d52c0ec5215f21ef2e054Dmitri Gribenko // noise. 275625bb569df0c34feec0d52c0ec5215f21ef2e054Dmitri Gribenko if (NumElts != 0 && !CurrentInstantiationScope && 276625bb569df0c34feec0d52c0ec5215f21ef2e054Dmitri Gribenko getCurCompoundScope().HasEmptyLoopBodies) { 277625bb569df0c34feec0d52c0ec5215f21ef2e054Dmitri Gribenko for (unsigned i = 0; i != NumElts - 1; ++i) 278625bb569df0c34feec0d52c0ec5215f21ef2e054Dmitri Gribenko DiagnoseEmptyLoopBody(Elts[i], Elts[i + 1]); 279625bb569df0c34feec0d52c0ec5215f21ef2e054Dmitri Gribenko } 280625bb569df0c34feec0d52c0ec5215f21ef2e054Dmitri Gribenko 2818189cde56b4f6f938cd65f53c932fe1860d0204cTed Kremenek return Owned(new (Context) CompoundStmt(Context, Elts, NumElts, L, R)); 2825f016e2cb5d11daeb237544de1c5d59f20fe1a6eReid Spencer} 2835f016e2cb5d11daeb237544de1c5d59f20fe1a6eReid Spencer 28460d7b3a319d84d688752be3870615ac0f111fb16John McCallStmtResult 2859ae2f076ca5ab1feb3ba95629099ec2319833701John McCallSema::ActOnCaseStmt(SourceLocation CaseLoc, Expr *LHSVal, 2869ae2f076ca5ab1feb3ba95629099ec2319833701John McCall SourceLocation DotDotDotLoc, Expr *RHSVal, 28724e1e707b4c362f18e371e2bbf054a8345b57bfaChris Lattner SourceLocation ColonLoc) { 2889ae2f076ca5ab1feb3ba95629099ec2319833701John McCall assert((LHSVal != 0) && "missing expression in case statement"); 289117054a99f4994e4ec8a1fc904b554e1f2dc9b29Sebastian Redl 2908ef7b203332b0c8d65876a1f5e6d1db4e6f40e4bRichard Smith if (getCurFunction()->SwitchStack.empty()) { 2918ef7b203332b0c8d65876a1f5e6d1db4e6f40e4bRichard Smith Diag(CaseLoc, diag::err_case_not_in_switch); 29224e1e707b4c362f18e371e2bbf054a8345b57bfaChris Lattner return StmtError(); 2938ef7b203332b0c8d65876a1f5e6d1db4e6f40e4bRichard Smith } 2945f016e2cb5d11daeb237544de1c5d59f20fe1a6eReid Spencer 2958ef7b203332b0c8d65876a1f5e6d1db4e6f40e4bRichard Smith if (!getLangOptions().CPlusPlus0x) { 2968ef7b203332b0c8d65876a1f5e6d1db4e6f40e4bRichard Smith // C99 6.8.4.2p3: The expression shall be an integer constant. 2978ef7b203332b0c8d65876a1f5e6d1db4e6f40e4bRichard Smith // However, GCC allows any evaluatable integer expression. 298282e7e66748cc6dd14d6f7f2cb52e5373c531e61Richard Smith if (!LHSVal->isTypeDependent() && !LHSVal->isValueDependent()) { 299282e7e66748cc6dd14d6f7f2cb52e5373c531e61Richard Smith LHSVal = VerifyIntegerConstantExpression(LHSVal).take(); 300282e7e66748cc6dd14d6f7f2cb52e5373c531e61Richard Smith if (!LHSVal) 301282e7e66748cc6dd14d6f7f2cb52e5373c531e61Richard Smith return StmtError(); 302282e7e66748cc6dd14d6f7f2cb52e5373c531e61Richard Smith } 303117054a99f4994e4ec8a1fc904b554e1f2dc9b29Sebastian Redl 3048ef7b203332b0c8d65876a1f5e6d1db4e6f40e4bRichard Smith // GCC extension: The expression shall be an integer constant. 305117054a99f4994e4ec8a1fc904b554e1f2dc9b29Sebastian Redl 306282e7e66748cc6dd14d6f7f2cb52e5373c531e61Richard Smith if (RHSVal && !RHSVal->isTypeDependent() && !RHSVal->isValueDependent()) { 307282e7e66748cc6dd14d6f7f2cb52e5373c531e61Richard Smith RHSVal = VerifyIntegerConstantExpression(RHSVal).take(); 308282e7e66748cc6dd14d6f7f2cb52e5373c531e61Richard Smith // Recover from an error by just forgetting about it. 3098ef7b203332b0c8d65876a1f5e6d1db4e6f40e4bRichard Smith } 3108a87e57beb96212ee61dc08a5f691cd7f7710703Chris Lattner } 3115f016e2cb5d11daeb237544de1c5d59f20fe1a6eReid Spencer 312dbb26db1d426fb6caaaf1b4fa47b46d1947c12c9Douglas Gregor CaseStmt *CS = new (Context) CaseStmt(LHSVal, RHSVal, CaseLoc, DotDotDotLoc, 313dbb26db1d426fb6caaaf1b4fa47b46d1947c12c9Douglas Gregor ColonLoc); 314781472fe99a120098c631b0cbe33c89f8cef5e70John McCall getCurFunction()->SwitchStack.back()->addSwitchCase(CS); 315117054a99f4994e4ec8a1fc904b554e1f2dc9b29Sebastian Redl return Owned(CS); 3165f016e2cb5d11daeb237544de1c5d59f20fe1a6eReid Spencer} 3175f016e2cb5d11daeb237544de1c5d59f20fe1a6eReid Spencer 31824e1e707b4c362f18e371e2bbf054a8345b57bfaChris Lattner/// ActOnCaseStmtBody - This installs a statement as the body of a case. 3199ae2f076ca5ab1feb3ba95629099ec2319833701John McCallvoid Sema::ActOnCaseStmtBody(Stmt *caseStmt, Stmt *SubStmt) { 3205440bfaff6aec058b60bc6da75bb4f13b7a76491Chandler Carruth DiagnoseUnusedExprResult(SubStmt); 3215440bfaff6aec058b60bc6da75bb4f13b7a76491Chandler Carruth 32224e1e707b4c362f18e371e2bbf054a8345b57bfaChris Lattner CaseStmt *CS = static_cast<CaseStmt*>(caseStmt); 32324e1e707b4c362f18e371e2bbf054a8345b57bfaChris Lattner CS->setSubStmt(SubStmt); 32424e1e707b4c362f18e371e2bbf054a8345b57bfaChris Lattner} 32524e1e707b4c362f18e371e2bbf054a8345b57bfaChris Lattner 32660d7b3a319d84d688752be3870615ac0f111fb16John McCallStmtResult 3271eb4433ac451dc16f4133a88af2d002ac26c58efMike StumpSema::ActOnDefaultStmt(SourceLocation DefaultLoc, SourceLocation ColonLoc, 3289ae2f076ca5ab1feb3ba95629099ec2319833701John McCall Stmt *SubStmt, Scope *CurScope) { 3295440bfaff6aec058b60bc6da75bb4f13b7a76491Chandler Carruth DiagnoseUnusedExprResult(SubStmt); 3305440bfaff6aec058b60bc6da75bb4f13b7a76491Chandler Carruth 331781472fe99a120098c631b0cbe33c89f8cef5e70John McCall if (getCurFunction()->SwitchStack.empty()) { 3320fa152e72bb71c4aa184d0edd91caa9cbebbf70eChris Lattner Diag(DefaultLoc, diag::err_default_not_in_switch); 333117054a99f4994e4ec8a1fc904b554e1f2dc9b29Sebastian Redl return Owned(SubStmt); 3340fa152e72bb71c4aa184d0edd91caa9cbebbf70eChris Lattner } 335117054a99f4994e4ec8a1fc904b554e1f2dc9b29Sebastian Redl 336dbb26db1d426fb6caaaf1b4fa47b46d1947c12c9Douglas Gregor DefaultStmt *DS = new (Context) DefaultStmt(DefaultLoc, ColonLoc, SubStmt); 337781472fe99a120098c631b0cbe33c89f8cef5e70John McCall getCurFunction()->SwitchStack.back()->addSwitchCase(DS); 338117054a99f4994e4ec8a1fc904b554e1f2dc9b29Sebastian Redl return Owned(DS); 3395f016e2cb5d11daeb237544de1c5d59f20fe1a6eReid Spencer} 3405f016e2cb5d11daeb237544de1c5d59f20fe1a6eReid Spencer 34160d7b3a319d84d688752be3870615ac0f111fb16John McCallStmtResult 34257ad37823e198f977cac605dbfbaefb4daf325e9Chris LattnerSema::ActOnLabelStmt(SourceLocation IdentLoc, LabelDecl *TheDecl, 34357ad37823e198f977cac605dbfbaefb4daf325e9Chris Lattner SourceLocation ColonLoc, Stmt *SubStmt) { 34457ad37823e198f977cac605dbfbaefb4daf325e9Chris Lattner 345ad8dcf4a9df0e24051dc31bf9e6f3cd138a34298Chris Lattner // If the label was multiply defined, reject it now. 346ad8dcf4a9df0e24051dc31bf9e6f3cd138a34298Chris Lattner if (TheDecl->getStmt()) { 347ad8dcf4a9df0e24051dc31bf9e6f3cd138a34298Chris Lattner Diag(IdentLoc, diag::err_redefinition_of_label) << TheDecl->getDeclName(); 348ad8dcf4a9df0e24051dc31bf9e6f3cd138a34298Chris Lattner Diag(TheDecl->getLocation(), diag::note_previous_definition); 349de307473448fb3cebcb4c10090728300b53bca03Sebastian Redl return Owned(SubStmt); 3505f016e2cb5d11daeb237544de1c5d59f20fe1a6eReid Spencer } 351de307473448fb3cebcb4c10090728300b53bca03Sebastian Redl 352ad8dcf4a9df0e24051dc31bf9e6f3cd138a34298Chris Lattner // Otherwise, things are good. Fill in the declaration and return it. 353ad8dcf4a9df0e24051dc31bf9e6f3cd138a34298Chris Lattner LabelStmt *LS = new (Context) LabelStmt(IdentLoc, TheDecl, SubStmt); 354ad8dcf4a9df0e24051dc31bf9e6f3cd138a34298Chris Lattner TheDecl->setStmt(LS); 355203548ba4b72e7e59320d352afc1eb0b5ab131deAbramo Bagnara if (!TheDecl->isGnuLocal()) 356203548ba4b72e7e59320d352afc1eb0b5ab131deAbramo Bagnara TheDecl->setLocation(IdentLoc); 357ad8dcf4a9df0e24051dc31bf9e6f3cd138a34298Chris Lattner return Owned(LS); 3585f016e2cb5d11daeb237544de1c5d59f20fe1a6eReid Spencer} 3595f016e2cb5d11daeb237544de1c5d59f20fe1a6eReid Spencer 36060d7b3a319d84d688752be3870615ac0f111fb16John McCallStmtResult 361d226f65006733ed7f709c3174f22ce33391cb58fJohn McCallSema::ActOnIfStmt(SourceLocation IfLoc, FullExprArg CondVal, Decl *CondVar, 36244aa1f397855f130e88e62ffc1029f7f83bb5d2eArgyrios Kyrtzidis Stmt *thenStmt, SourceLocation ElseLoc, 36344aa1f397855f130e88e62ffc1029f7f83bb5d2eArgyrios Kyrtzidis Stmt *elseStmt) { 36460d7b3a319d84d688752be3870615ac0f111fb16John McCall ExprResult CondResult(CondVal.release()); 3651eb4433ac451dc16f4133a88af2d002ac26c58efMike Stump 3668cfe5a784133d90bf329fd20801824a6f71bb8caDouglas Gregor VarDecl *ConditionVar = 0; 367d226f65006733ed7f709c3174f22ce33391cb58fJohn McCall if (CondVar) { 368d226f65006733ed7f709c3174f22ce33391cb58fJohn McCall ConditionVar = cast<VarDecl>(CondVar); 369586596fd7f7a336a2847b300c80614dcf39ab6d5Douglas Gregor CondResult = CheckConditionVariable(ConditionVar, IfLoc, true); 37099e9b4d172f6877e6ba5ebe75bb8238721f5e01cDouglas Gregor if (CondResult.isInvalid()) 37199e9b4d172f6877e6ba5ebe75bb8238721f5e01cDouglas Gregor return StmtError(); 3728cfe5a784133d90bf329fd20801824a6f71bb8caDouglas Gregor } 37399e9b4d172f6877e6ba5ebe75bb8238721f5e01cDouglas Gregor Expr *ConditionExpr = CondResult.takeAs<Expr>(); 37499e9b4d172f6877e6ba5ebe75bb8238721f5e01cDouglas Gregor if (!ConditionExpr) 37599e9b4d172f6877e6ba5ebe75bb8238721f5e01cDouglas Gregor return StmtError(); 376dfbb02a16ac8c764b5ba1742450513d6212d2f9fNAKAMURA Takumi 377754431107b61a0523df5271c2876a73dd5a051e9Anders Carlsson DiagnoseUnusedExprResult(thenStmt); 3785f016e2cb5d11daeb237544de1c5d59f20fe1a6eReid Spencer 3799ae2f076ca5ab1feb3ba95629099ec2319833701John McCall if (!elseStmt) { 380625bb569df0c34feec0d52c0ec5215f21ef2e054Dmitri Gribenko DiagnoseEmptyStmtBody(ConditionExpr->getLocEnd(), thenStmt, 381625bb569df0c34feec0d52c0ec5215f21ef2e054Dmitri Gribenko diag::warn_empty_if_body); 3822d85f8ba62fd6fdcf0ae303d77112b413d412caeAnders Carlsson } 3832d85f8ba62fd6fdcf0ae303d77112b413d412caeAnders Carlsson 384754431107b61a0523df5271c2876a73dd5a051e9Anders Carlsson DiagnoseUnusedExprResult(elseStmt); 3851eb4433ac451dc16f4133a88af2d002ac26c58efMike Stump 386dfbb02a16ac8c764b5ba1742450513d6212d2f9fNAKAMURA Takumi return Owned(new (Context) IfStmt(Context, IfLoc, ConditionVar, ConditionExpr, 38744aa1f397855f130e88e62ffc1029f7f83bb5d2eArgyrios Kyrtzidis thenStmt, ElseLoc, elseStmt)); 3885f016e2cb5d11daeb237544de1c5d59f20fe1a6eReid Spencer} 3895f016e2cb5d11daeb237544de1c5d59f20fe1a6eReid Spencer 390f4021e7d5228a2be5a380269dffa0331a6c78b95Chris Lattner/// ConvertIntegerToTypeWarnOnOverflow - Convert the specified APInt to have 391f4021e7d5228a2be5a380269dffa0331a6c78b95Chris Lattner/// the specified width and sign. If an overflow occurs, detect it and emit 392f4021e7d5228a2be5a380269dffa0331a6c78b95Chris Lattner/// the specified diagnostic. 393f4021e7d5228a2be5a380269dffa0331a6c78b95Chris Lattnervoid Sema::ConvertIntegerToTypeWarnOnOverflow(llvm::APSInt &Val, 394f4021e7d5228a2be5a380269dffa0331a6c78b95Chris Lattner unsigned NewWidth, bool NewSign, 3951eb4433ac451dc16f4133a88af2d002ac26c58efMike Stump SourceLocation Loc, 396f4021e7d5228a2be5a380269dffa0331a6c78b95Chris Lattner unsigned DiagID) { 397f4021e7d5228a2be5a380269dffa0331a6c78b95Chris Lattner // Perform a conversion to the promoted condition type if needed. 398f4021e7d5228a2be5a380269dffa0331a6c78b95Chris Lattner if (NewWidth > Val.getBitWidth()) { 399f4021e7d5228a2be5a380269dffa0331a6c78b95Chris Lattner // If this is an extension, just do it. 4009f71a8f4c7a182a5236da9e747d57cc1d1bd24c2Jay Foad Val = Val.extend(NewWidth); 401f4021e7d5228a2be5a380269dffa0331a6c78b95Chris Lattner Val.setIsSigned(NewSign); 402f9f627dbbc62fbf51b906c24c783b4249dc7e9bbDouglas Gregor 403f9f627dbbc62fbf51b906c24c783b4249dc7e9bbDouglas Gregor // If the input was signed and negative and the output is 404f9f627dbbc62fbf51b906c24c783b4249dc7e9bbDouglas Gregor // unsigned, don't bother to warn: this is implementation-defined 405f9f627dbbc62fbf51b906c24c783b4249dc7e9bbDouglas Gregor // behavior. 406f9f627dbbc62fbf51b906c24c783b4249dc7e9bbDouglas Gregor // FIXME: Introduce a second, default-ignored warning for this case? 407f4021e7d5228a2be5a380269dffa0331a6c78b95Chris Lattner } else if (NewWidth < Val.getBitWidth()) { 408f4021e7d5228a2be5a380269dffa0331a6c78b95Chris Lattner // If this is a truncation, check for overflow. 409f4021e7d5228a2be5a380269dffa0331a6c78b95Chris Lattner llvm::APSInt ConvVal(Val); 4109f71a8f4c7a182a5236da9e747d57cc1d1bd24c2Jay Foad ConvVal = ConvVal.trunc(NewWidth); 411b2137ae3f1bd0aadb0552189af2824a324ffaa69Chris Lattner ConvVal.setIsSigned(NewSign); 4129f71a8f4c7a182a5236da9e747d57cc1d1bd24c2Jay Foad ConvVal = ConvVal.extend(Val.getBitWidth()); 413b2137ae3f1bd0aadb0552189af2824a324ffaa69Chris Lattner ConvVal.setIsSigned(Val.isSigned()); 414f4021e7d5228a2be5a380269dffa0331a6c78b95Chris Lattner if (ConvVal != Val) 415d3a94e24ddf3fb90de76b17bd176d9ed61e66f2cChris Lattner Diag(Loc, DiagID) << Val.toString(10) << ConvVal.toString(10); 4161eb4433ac451dc16f4133a88af2d002ac26c58efMike Stump 417f4021e7d5228a2be5a380269dffa0331a6c78b95Chris Lattner // Regardless of whether a diagnostic was emitted, really do the 418f4021e7d5228a2be5a380269dffa0331a6c78b95Chris Lattner // truncation. 4199f71a8f4c7a182a5236da9e747d57cc1d1bd24c2Jay Foad Val = Val.trunc(NewWidth); 420b2137ae3f1bd0aadb0552189af2824a324ffaa69Chris Lattner Val.setIsSigned(NewSign); 421f4021e7d5228a2be5a380269dffa0331a6c78b95Chris Lattner } else if (NewSign != Val.isSigned()) { 422f4021e7d5228a2be5a380269dffa0331a6c78b95Chris Lattner // Convert the sign to match the sign of the condition. This can cause 423f4021e7d5228a2be5a380269dffa0331a6c78b95Chris Lattner // overflow as well: unsigned(INTMIN) 424dfbb02a16ac8c764b5ba1742450513d6212d2f9fNAKAMURA Takumi // We don't diagnose this overflow, because it is implementation-defined 4252853eac24e2e70a74d7da817653b0528b976039fDouglas Gregor // behavior. 4262853eac24e2e70a74d7da817653b0528b976039fDouglas Gregor // FIXME: Introduce a second, default-ignored warning for this case? 427f4021e7d5228a2be5a380269dffa0331a6c78b95Chris Lattner llvm::APSInt OldVal(Val); 428f4021e7d5228a2be5a380269dffa0331a6c78b95Chris Lattner Val.setIsSigned(NewSign); 429f4021e7d5228a2be5a380269dffa0331a6c78b95Chris Lattner } 430f4021e7d5228a2be5a380269dffa0331a6c78b95Chris Lattner} 431f4021e7d5228a2be5a380269dffa0331a6c78b95Chris Lattner 4320471f5bc8191e39cdb61fabcaf1870e2af2d42e8Chris Lattnernamespace { 4330471f5bc8191e39cdb61fabcaf1870e2af2d42e8Chris Lattner struct CaseCompareFunctor { 4340471f5bc8191e39cdb61fabcaf1870e2af2d42e8Chris Lattner bool operator()(const std::pair<llvm::APSInt, CaseStmt*> &LHS, 4350471f5bc8191e39cdb61fabcaf1870e2af2d42e8Chris Lattner const llvm::APSInt &RHS) { 4360471f5bc8191e39cdb61fabcaf1870e2af2d42e8Chris Lattner return LHS.first < RHS; 4370471f5bc8191e39cdb61fabcaf1870e2af2d42e8Chris Lattner } 4380e85a2761ace912c66663d779dd230f88cf77fe0Chris Lattner bool operator()(const std::pair<llvm::APSInt, CaseStmt*> &LHS, 4390e85a2761ace912c66663d779dd230f88cf77fe0Chris Lattner const std::pair<llvm::APSInt, CaseStmt*> &RHS) { 4400e85a2761ace912c66663d779dd230f88cf77fe0Chris Lattner return LHS.first < RHS.first; 4410e85a2761ace912c66663d779dd230f88cf77fe0Chris Lattner } 4420471f5bc8191e39cdb61fabcaf1870e2af2d42e8Chris Lattner bool operator()(const llvm::APSInt &LHS, 4430471f5bc8191e39cdb61fabcaf1870e2af2d42e8Chris Lattner const std::pair<llvm::APSInt, CaseStmt*> &RHS) { 4440471f5bc8191e39cdb61fabcaf1870e2af2d42e8Chris Lattner return LHS < RHS.first; 4450471f5bc8191e39cdb61fabcaf1870e2af2d42e8Chris Lattner } 4460471f5bc8191e39cdb61fabcaf1870e2af2d42e8Chris Lattner }; 4470471f5bc8191e39cdb61fabcaf1870e2af2d42e8Chris Lattner} 4480471f5bc8191e39cdb61fabcaf1870e2af2d42e8Chris Lattner 449764a7ce5217f9569e100a3445f47496ee82daf86Chris Lattner/// CmpCaseVals - Comparison predicate for sorting case values. 450764a7ce5217f9569e100a3445f47496ee82daf86Chris Lattner/// 451764a7ce5217f9569e100a3445f47496ee82daf86Chris Lattnerstatic bool CmpCaseVals(const std::pair<llvm::APSInt, CaseStmt*>& lhs, 452764a7ce5217f9569e100a3445f47496ee82daf86Chris Lattner const std::pair<llvm::APSInt, CaseStmt*>& rhs) { 453764a7ce5217f9569e100a3445f47496ee82daf86Chris Lattner if (lhs.first < rhs.first) 454764a7ce5217f9569e100a3445f47496ee82daf86Chris Lattner return true; 455764a7ce5217f9569e100a3445f47496ee82daf86Chris Lattner 456764a7ce5217f9569e100a3445f47496ee82daf86Chris Lattner if (lhs.first == rhs.first && 457764a7ce5217f9569e100a3445f47496ee82daf86Chris Lattner lhs.second->getCaseLoc().getRawEncoding() 458764a7ce5217f9569e100a3445f47496ee82daf86Chris Lattner < rhs.second->getCaseLoc().getRawEncoding()) 459764a7ce5217f9569e100a3445f47496ee82daf86Chris Lattner return true; 460764a7ce5217f9569e100a3445f47496ee82daf86Chris Lattner return false; 461764a7ce5217f9569e100a3445f47496ee82daf86Chris Lattner} 462764a7ce5217f9569e100a3445f47496ee82daf86Chris Lattner 463ba915af51ced751c46e7c2b9c6f3b59d2e668825Douglas Gregor/// CmpEnumVals - Comparison predicate for sorting enumeration values. 464ba915af51ced751c46e7c2b9c6f3b59d2e668825Douglas Gregor/// 465ba915af51ced751c46e7c2b9c6f3b59d2e668825Douglas Gregorstatic bool CmpEnumVals(const std::pair<llvm::APSInt, EnumConstantDecl*>& lhs, 466ba915af51ced751c46e7c2b9c6f3b59d2e668825Douglas Gregor const std::pair<llvm::APSInt, EnumConstantDecl*>& rhs) 467ba915af51ced751c46e7c2b9c6f3b59d2e668825Douglas Gregor{ 468ba915af51ced751c46e7c2b9c6f3b59d2e668825Douglas Gregor return lhs.first < rhs.first; 469ba915af51ced751c46e7c2b9c6f3b59d2e668825Douglas Gregor} 470ba915af51ced751c46e7c2b9c6f3b59d2e668825Douglas Gregor 471ba915af51ced751c46e7c2b9c6f3b59d2e668825Douglas Gregor/// EqEnumVals - Comparison preficate for uniqing enumeration values. 472ba915af51ced751c46e7c2b9c6f3b59d2e668825Douglas Gregor/// 473ba915af51ced751c46e7c2b9c6f3b59d2e668825Douglas Gregorstatic bool EqEnumVals(const std::pair<llvm::APSInt, EnumConstantDecl*>& lhs, 474ba915af51ced751c46e7c2b9c6f3b59d2e668825Douglas Gregor const std::pair<llvm::APSInt, EnumConstantDecl*>& rhs) 475ba915af51ced751c46e7c2b9c6f3b59d2e668825Douglas Gregor{ 476ba915af51ced751c46e7c2b9c6f3b59d2e668825Douglas Gregor return lhs.first == rhs.first; 477ba915af51ced751c46e7c2b9c6f3b59d2e668825Douglas Gregor} 478ba915af51ced751c46e7c2b9c6f3b59d2e668825Douglas Gregor 4795f04881eb025f61396d0555d8173730fe2759e0aChris Lattner/// GetTypeBeforeIntegralPromotion - Returns the pre-promotion type of 4805f04881eb025f61396d0555d8173730fe2759e0aChris Lattner/// potentially integral-promoted expression @p expr. 481a8e0cd8cdecc7e0ba1792e46773b884c6eed4829John McCallstatic QualType GetTypeBeforeIntegralPromotion(Expr *&expr) { 482a8e0cd8cdecc7e0ba1792e46773b884c6eed4829John McCall if (ExprWithCleanups *cleanups = dyn_cast<ExprWithCleanups>(expr)) 483a8e0cd8cdecc7e0ba1792e46773b884c6eed4829John McCall expr = cleanups->getSubExpr(); 484a8e0cd8cdecc7e0ba1792e46773b884c6eed4829John McCall while (ImplicitCastExpr *impcast = dyn_cast<ImplicitCastExpr>(expr)) { 485a8e0cd8cdecc7e0ba1792e46773b884c6eed4829John McCall if (impcast->getCastKind() != CK_IntegralCast) break; 486a8e0cd8cdecc7e0ba1792e46773b884c6eed4829John McCall expr = impcast->getSubExpr(); 4875f04881eb025f61396d0555d8173730fe2759e0aChris Lattner } 4885f04881eb025f61396d0555d8173730fe2759e0aChris Lattner return expr->getType(); 4895f04881eb025f61396d0555d8173730fe2759e0aChris Lattner} 4905f04881eb025f61396d0555d8173730fe2759e0aChris Lattner 49160d7b3a319d84d688752be3870615ac0f111fb16John McCallStmtResult 492dfbb02a16ac8c764b5ba1742450513d6212d2f9fNAKAMURA TakumiSema::ActOnStartOfSwitchStmt(SourceLocation SwitchLoc, Expr *Cond, 493d226f65006733ed7f709c3174f22ce33391cb58fJohn McCall Decl *CondVar) { 49460d7b3a319d84d688752be3870615ac0f111fb16John McCall ExprResult CondResult; 4959ae2f076ca5ab1feb3ba95629099ec2319833701John McCall 496586596fd7f7a336a2847b300c80614dcf39ab6d5Douglas Gregor VarDecl *ConditionVar = 0; 497d226f65006733ed7f709c3174f22ce33391cb58fJohn McCall if (CondVar) { 498d226f65006733ed7f709c3174f22ce33391cb58fJohn McCall ConditionVar = cast<VarDecl>(CondVar); 4999ae2f076ca5ab1feb3ba95629099ec2319833701John McCall CondResult = CheckConditionVariable(ConditionVar, SourceLocation(), false); 5009ae2f076ca5ab1feb3ba95629099ec2319833701John McCall if (CondResult.isInvalid()) 501586596fd7f7a336a2847b300c80614dcf39ab6d5Douglas Gregor return StmtError(); 502dfbb02a16ac8c764b5ba1742450513d6212d2f9fNAKAMURA Takumi 5039ae2f076ca5ab1feb3ba95629099ec2319833701John McCall Cond = CondResult.release(); 504586596fd7f7a336a2847b300c80614dcf39ab6d5Douglas Gregor } 505dfbb02a16ac8c764b5ba1742450513d6212d2f9fNAKAMURA Takumi 5069ae2f076ca5ab1feb3ba95629099ec2319833701John McCall if (!Cond) 507586596fd7f7a336a2847b300c80614dcf39ab6d5Douglas Gregor return StmtError(); 508dfbb02a16ac8c764b5ba1742450513d6212d2f9fNAKAMURA Takumi 5099ae2f076ca5ab1feb3ba95629099ec2319833701John McCall CondResult 510ceccab908bd7824751b1def127272ec04dd4732bEli Friedman = ConvertToIntegralOrEnumerationType(SwitchLoc, Cond, 511c30614b7e2bad089f2509499379de509f33162d6Douglas Gregor PDiag(diag::err_typecheck_statement_requires_integer), 512c30614b7e2bad089f2509499379de509f33162d6Douglas Gregor PDiag(diag::err_switch_incomplete_class_type) 5139ae2f076ca5ab1feb3ba95629099ec2319833701John McCall << Cond->getSourceRange(), 514c30614b7e2bad089f2509499379de509f33162d6Douglas Gregor PDiag(diag::err_switch_explicit_conversion), 515c30614b7e2bad089f2509499379de509f33162d6Douglas Gregor PDiag(diag::note_switch_conversion), 516c30614b7e2bad089f2509499379de509f33162d6Douglas Gregor PDiag(diag::err_switch_multiple_conversions), 5176bc574daab3d3571d888cc4a21df67f2e2a14792Douglas Gregor PDiag(diag::note_switch_conversion), 518f39aec17b89f8f0dd78e78c50ad2fa08f12272e3Richard Smith PDiag(0), 519f39aec17b89f8f0dd78e78c50ad2fa08f12272e3Richard Smith /*AllowScopedEnumerations*/ true); 5209ae2f076ca5ab1feb3ba95629099ec2319833701John McCall if (CondResult.isInvalid()) return StmtError(); 5219ae2f076ca5ab1feb3ba95629099ec2319833701John McCall Cond = CondResult.take(); 522dfbb02a16ac8c764b5ba1742450513d6212d2f9fNAKAMURA Takumi 523a8e0cd8cdecc7e0ba1792e46773b884c6eed4829John McCall // C99 6.8.4.2p5 - Integer promotions are performed on the controlling expr. 524a8e0cd8cdecc7e0ba1792e46773b884c6eed4829John McCall CondResult = UsualUnaryConversions(Cond); 525a8e0cd8cdecc7e0ba1792e46773b884c6eed4829John McCall if (CondResult.isInvalid()) return StmtError(); 526a8e0cd8cdecc7e0ba1792e46773b884c6eed4829John McCall Cond = CondResult.take(); 527a8e0cd8cdecc7e0ba1792e46773b884c6eed4829John McCall 528d226f65006733ed7f709c3174f22ce33391cb58fJohn McCall if (!CondVar) { 529b4eb64d8426c0eaa58d398961e0e74ff85063d7cJohn McCall CheckImplicitConversions(Cond, SwitchLoc); 5304765fa05b5652fcc4356371c2f481d0ea9a1b007John McCall CondResult = MaybeCreateExprWithCleanups(Cond); 5319ae2f076ca5ab1feb3ba95629099ec2319833701John McCall if (CondResult.isInvalid()) 532586596fd7f7a336a2847b300c80614dcf39ab6d5Douglas Gregor return StmtError(); 5339ae2f076ca5ab1feb3ba95629099ec2319833701John McCall Cond = CondResult.take(); 534586596fd7f7a336a2847b300c80614dcf39ab6d5Douglas Gregor } 535b60a77e453d32db0ab1914d28e175c2defc0eb65John McCall 536781472fe99a120098c631b0cbe33c89f8cef5e70John McCall getCurFunction()->setHasBranchIntoScope(); 537dfbb02a16ac8c764b5ba1742450513d6212d2f9fNAKAMURA Takumi 5389ae2f076ca5ab1feb3ba95629099ec2319833701John McCall SwitchStmt *SS = new (Context) SwitchStmt(Context, ConditionVar, Cond); 539781472fe99a120098c631b0cbe33c89f8cef5e70John McCall getCurFunction()->SwitchStack.push_back(SS); 540586596fd7f7a336a2847b300c80614dcf39ab6d5Douglas Gregor return Owned(SS); 5417e52de4b45286d057b367bb1f9283a1e32d79252Chris Lattner} 5427e52de4b45286d057b367bb1f9283a1e32d79252Chris Lattner 54328164ab2ac1deea68cdb989f941728bf1860ce41Gabor Greifstatic void AdjustAPSInt(llvm::APSInt &Val, unsigned BitWidth, bool IsSigned) { 54428164ab2ac1deea68cdb989f941728bf1860ce41Gabor Greif if (Val.getBitWidth() < BitWidth) 5459f71a8f4c7a182a5236da9e747d57cc1d1bd24c2Jay Foad Val = Val.extend(BitWidth); 54628164ab2ac1deea68cdb989f941728bf1860ce41Gabor Greif else if (Val.getBitWidth() > BitWidth) 5479f71a8f4c7a182a5236da9e747d57cc1d1bd24c2Jay Foad Val = Val.trunc(BitWidth); 54828164ab2ac1deea68cdb989f941728bf1860ce41Gabor Greif Val.setIsSigned(IsSigned); 54928164ab2ac1deea68cdb989f941728bf1860ce41Gabor Greif} 55028164ab2ac1deea68cdb989f941728bf1860ce41Gabor Greif 55160d7b3a319d84d688752be3870615ac0f111fb16John McCallStmtResult 5529ae2f076ca5ab1feb3ba95629099ec2319833701John McCallSema::ActOnFinishSwitchStmt(SourceLocation SwitchLoc, Stmt *Switch, 5539ae2f076ca5ab1feb3ba95629099ec2319833701John McCall Stmt *BodyStmt) { 5549ae2f076ca5ab1feb3ba95629099ec2319833701John McCall SwitchStmt *SS = cast<SwitchStmt>(Switch); 555781472fe99a120098c631b0cbe33c89f8cef5e70John McCall assert(SS == getCurFunction()->SwitchStack.back() && 556781472fe99a120098c631b0cbe33c89f8cef5e70John McCall "switch stack missing push/pop!"); 557de307473448fb3cebcb4c10090728300b53bca03Sebastian Redl 5589dcbfa450d751bd68fc4af8b75da381d4f6984b9Steve Naroff SS->setBody(BodyStmt, SwitchLoc); 559781472fe99a120098c631b0cbe33c89f8cef5e70John McCall getCurFunction()->SwitchStack.pop_back(); 560c1fcb7762673be706b0a40477d5e93411e918f93Anders Carlsson 561f4021e7d5228a2be5a380269dffa0331a6c78b95Chris Lattner Expr *CondExpr = SS->getCond(); 562a8e0cd8cdecc7e0ba1792e46773b884c6eed4829John McCall if (!CondExpr) return StmtError(); 563de307473448fb3cebcb4c10090728300b53bca03Sebastian Redl 564a0d3ca1ea5578bc736bb71bcec50ab41fefc87b9Douglas Gregor QualType CondType = CondExpr->getType(); 565a8e0cd8cdecc7e0ba1792e46773b884c6eed4829John McCall 566a8e0cd8cdecc7e0ba1792e46773b884c6eed4829John McCall Expr *CondExprBeforePromotion = CondExpr; 567a8e0cd8cdecc7e0ba1792e46773b884c6eed4829John McCall QualType CondTypeBeforePromotion = 568a8e0cd8cdecc7e0ba1792e46773b884c6eed4829John McCall GetTypeBeforeIntegralPromotion(CondExprBeforePromotion); 56984fb9c0be621c9e4ca4e56f67dae2a0bb6e44821Douglas Gregor 5705f04881eb025f61396d0555d8173730fe2759e0aChris Lattner // C++ 6.4.2.p2: 5715f04881eb025f61396d0555d8173730fe2759e0aChris Lattner // Integral promotions are performed (on the switch condition). 5725f04881eb025f61396d0555d8173730fe2759e0aChris Lattner // 5735f04881eb025f61396d0555d8173730fe2759e0aChris Lattner // A case value unrepresentable by the original switch condition 5745f04881eb025f61396d0555d8173730fe2759e0aChris Lattner // type (before the promotion) doesn't make sense, even when it can 5755f04881eb025f61396d0555d8173730fe2759e0aChris Lattner // be represented by the promoted type. Therefore we need to find 5765f04881eb025f61396d0555d8173730fe2759e0aChris Lattner // the pre-promotion type of the switch condition. 57712356b119032edd64e9c32f9f01920d12c2acc57Edward O'Callaghan if (!CondExpr->isTypeDependent()) { 578acb0bd85d30ecacbe872ca9d9cfac5d7b6038a43Douglas Gregor // We have already converted the expression to an integral or enumeration 579dfbb02a16ac8c764b5ba1742450513d6212d2f9fNAKAMURA Takumi // type, when we started the switch statement. If we don't have an 580acb0bd85d30ecacbe872ca9d9cfac5d7b6038a43Douglas Gregor // appropriate type now, just return an error. 581acb0bd85d30ecacbe872ca9d9cfac5d7b6038a43Douglas Gregor if (!CondType->isIntegralOrEnumerationType()) 58212356b119032edd64e9c32f9f01920d12c2acc57Edward O'Callaghan return StmtError(); 58312356b119032edd64e9c32f9f01920d12c2acc57Edward O'Callaghan 5842b334bb3126a67895813e49e6228dad4aec0b4d6Chris Lattner if (CondExpr->isKnownToHaveBooleanValue()) { 58512356b119032edd64e9c32f9f01920d12c2acc57Edward O'Callaghan // switch(bool_expr) {...} is often a programmer error, e.g. 58612356b119032edd64e9c32f9f01920d12c2acc57Edward O'Callaghan // switch(n && mask) { ... } // Doh - should be "n & mask". 58712356b119032edd64e9c32f9f01920d12c2acc57Edward O'Callaghan // One can always use an if statement instead of switch(bool_expr). 58812356b119032edd64e9c32f9f01920d12c2acc57Edward O'Callaghan Diag(SwitchLoc, diag::warn_bool_switch_condition) 58912356b119032edd64e9c32f9f01920d12c2acc57Edward O'Callaghan << CondExpr->getSourceRange(); 59012356b119032edd64e9c32f9f01920d12c2acc57Edward O'Callaghan } 591c1fcb7762673be706b0a40477d5e93411e918f93Anders Carlsson } 592de307473448fb3cebcb4c10090728300b53bca03Sebastian Redl 593f4021e7d5228a2be5a380269dffa0331a6c78b95Chris Lattner // Get the bitwidth of the switched-on value before promotions. We must 594f4021e7d5228a2be5a380269dffa0331a6c78b95Chris Lattner // convert the integer case values to this width before comparison. 5951eb4433ac451dc16f4133a88af2d002ac26c58efMike Stump bool HasDependentValue 596dbb26db1d426fb6caaaf1b4fa47b46d1947c12c9Douglas Gregor = CondExpr->isTypeDependent() || CondExpr->isValueDependent(); 5971eb4433ac451dc16f4133a88af2d002ac26c58efMike Stump unsigned CondWidth 5981d6ab7af99a1fc059a6aa5da083640c1d94b07f7Chris Lattner = HasDependentValue ? 0 : Context.getIntWidth(CondTypeBeforePromotion); 599575a1c9dc8dc5b4977194993e289f9eda7295c39Douglas Gregor bool CondIsSigned 600575a1c9dc8dc5b4977194993e289f9eda7295c39Douglas Gregor = CondTypeBeforePromotion->isSignedIntegerOrEnumerationType(); 6011eb4433ac451dc16f4133a88af2d002ac26c58efMike Stump 602f4021e7d5228a2be5a380269dffa0331a6c78b95Chris Lattner // Accumulate all of the case values in a vector so that we can sort them 603f4021e7d5228a2be5a380269dffa0331a6c78b95Chris Lattner // and detect duplicates. This vector contains the APInt for the case after 604f4021e7d5228a2be5a380269dffa0331a6c78b95Chris Lattner // it has been converted to the condition type. 6055f9e272e632e951b1efe824cd16acb4d96077930Chris Lattner typedef SmallVector<std::pair<llvm::APSInt, CaseStmt*>, 64> CaseValsTy; 6060471f5bc8191e39cdb61fabcaf1870e2af2d42e8Chris Lattner CaseValsTy CaseVals; 6071eb4433ac451dc16f4133a88af2d002ac26c58efMike Stump 608f4021e7d5228a2be5a380269dffa0331a6c78b95Chris Lattner // Keep track of any GNU case ranges we see. The APSInt is the low value. 609ba915af51ced751c46e7c2b9c6f3b59d2e668825Douglas Gregor typedef std::vector<std::pair<llvm::APSInt, CaseStmt*> > CaseRangesTy; 610ba915af51ced751c46e7c2b9c6f3b59d2e668825Douglas Gregor CaseRangesTy CaseRanges; 6111eb4433ac451dc16f4133a88af2d002ac26c58efMike Stump 612f4021e7d5228a2be5a380269dffa0331a6c78b95Chris Lattner DefaultStmt *TheDefaultStmt = 0; 6131eb4433ac451dc16f4133a88af2d002ac26c58efMike Stump 614b2ec9d6fede9cccc170a202de7bf7f523dea8be4Chris Lattner bool CaseListIsErroneous = false; 6151eb4433ac451dc16f4133a88af2d002ac26c58efMike Stump 616dbb26db1d426fb6caaaf1b4fa47b46d1947c12c9Douglas Gregor for (SwitchCase *SC = SS->getSwitchCaseList(); SC && !HasDependentValue; 617c1fcb7762673be706b0a40477d5e93411e918f93Anders Carlsson SC = SC->getNextSwitchCase()) { 6181eb4433ac451dc16f4133a88af2d002ac26c58efMike Stump 619c1fcb7762673be706b0a40477d5e93411e918f93Anders Carlsson if (DefaultStmt *DS = dyn_cast<DefaultStmt>(SC)) { 620f4021e7d5228a2be5a380269dffa0331a6c78b95Chris Lattner if (TheDefaultStmt) { 621f4021e7d5228a2be5a380269dffa0331a6c78b95Chris Lattner Diag(DS->getDefaultLoc(), diag::err_multiple_default_labels_defined); 6225f4a6829dc58cab2f76e2b98492859aa3b91e3f2Chris Lattner Diag(TheDefaultStmt->getDefaultLoc(), diag::note_duplicate_case_prev); 623de307473448fb3cebcb4c10090728300b53bca03Sebastian Redl 624f4021e7d5228a2be5a380269dffa0331a6c78b95Chris Lattner // FIXME: Remove the default statement from the switch block so that 625390b4cc8b45a05612349269ef08faab3e4688f06Mike Stump // we'll return a valid AST. This requires recursing down the AST and 626390b4cc8b45a05612349269ef08faab3e4688f06Mike Stump // finding it, not something we are set up to do right now. For now, 627390b4cc8b45a05612349269ef08faab3e4688f06Mike Stump // just lop the entire switch stmt out of the AST. 628b2ec9d6fede9cccc170a202de7bf7f523dea8be4Chris Lattner CaseListIsErroneous = true; 629c1fcb7762673be706b0a40477d5e93411e918f93Anders Carlsson } 630f4021e7d5228a2be5a380269dffa0331a6c78b95Chris Lattner TheDefaultStmt = DS; 6311eb4433ac451dc16f4133a88af2d002ac26c58efMike Stump 632f4021e7d5228a2be5a380269dffa0331a6c78b95Chris Lattner } else { 633f4021e7d5228a2be5a380269dffa0331a6c78b95Chris Lattner CaseStmt *CS = cast<CaseStmt>(SC); 6341eb4433ac451dc16f4133a88af2d002ac26c58efMike Stump 6351e0a39012467b4f409142c32148036a9ee05e1d7Chris Lattner Expr *Lo = CS->getLHS(); 636dbb26db1d426fb6caaaf1b4fa47b46d1947c12c9Douglas Gregor 637dbb26db1d426fb6caaaf1b4fa47b46d1947c12c9Douglas Gregor if (Lo->isTypeDependent() || Lo->isValueDependent()) { 638dbb26db1d426fb6caaaf1b4fa47b46d1947c12c9Douglas Gregor HasDependentValue = true; 639dbb26db1d426fb6caaaf1b4fa47b46d1947c12c9Douglas Gregor break; 640dbb26db1d426fb6caaaf1b4fa47b46d1947c12c9Douglas Gregor } 6411eb4433ac451dc16f4133a88af2d002ac26c58efMike Stump 6428ef7b203332b0c8d65876a1f5e6d1db4e6f40e4bRichard Smith llvm::APSInt LoVal; 6431eb4433ac451dc16f4133a88af2d002ac26c58efMike Stump 6448ef7b203332b0c8d65876a1f5e6d1db4e6f40e4bRichard Smith if (getLangOptions().CPlusPlus0x) { 6458ef7b203332b0c8d65876a1f5e6d1db4e6f40e4bRichard Smith // C++11 [stmt.switch]p2: the constant-expression shall be a converted 6468ef7b203332b0c8d65876a1f5e6d1db4e6f40e4bRichard Smith // constant expression of the promoted type of the switch condition. 6478ef7b203332b0c8d65876a1f5e6d1db4e6f40e4bRichard Smith ExprResult ConvLo = 6488ef7b203332b0c8d65876a1f5e6d1db4e6f40e4bRichard Smith CheckConvertedConstantExpression(Lo, CondType, LoVal, CCEK_CaseValue); 6498ef7b203332b0c8d65876a1f5e6d1db4e6f40e4bRichard Smith if (ConvLo.isInvalid()) { 6508ef7b203332b0c8d65876a1f5e6d1db4e6f40e4bRichard Smith CaseListIsErroneous = true; 6518ef7b203332b0c8d65876a1f5e6d1db4e6f40e4bRichard Smith continue; 6528ef7b203332b0c8d65876a1f5e6d1db4e6f40e4bRichard Smith } 6538ef7b203332b0c8d65876a1f5e6d1db4e6f40e4bRichard Smith Lo = ConvLo.take(); 6548ef7b203332b0c8d65876a1f5e6d1db4e6f40e4bRichard Smith } else { 6558ef7b203332b0c8d65876a1f5e6d1db4e6f40e4bRichard Smith // We already verified that the expression has a i-c-e value (C99 6568ef7b203332b0c8d65876a1f5e6d1db4e6f40e4bRichard Smith // 6.8.4.2p3) - get that value now. 6578ef7b203332b0c8d65876a1f5e6d1db4e6f40e4bRichard Smith LoVal = Lo->EvaluateKnownConstInt(Context); 6588ef7b203332b0c8d65876a1f5e6d1db4e6f40e4bRichard Smith 6598ef7b203332b0c8d65876a1f5e6d1db4e6f40e4bRichard Smith // If the LHS is not the same type as the condition, insert an implicit 6608ef7b203332b0c8d65876a1f5e6d1db4e6f40e4bRichard Smith // cast. 6618ef7b203332b0c8d65876a1f5e6d1db4e6f40e4bRichard Smith Lo = DefaultLvalueConversion(Lo).take(); 6628ef7b203332b0c8d65876a1f5e6d1db4e6f40e4bRichard Smith Lo = ImpCastExprToType(Lo, CondType, CK_IntegralCast).take(); 6638ef7b203332b0c8d65876a1f5e6d1db4e6f40e4bRichard Smith } 6648ef7b203332b0c8d65876a1f5e6d1db4e6f40e4bRichard Smith 6658ef7b203332b0c8d65876a1f5e6d1db4e6f40e4bRichard Smith // Convert the value to the same width/sign as the condition had prior to 6668ef7b203332b0c8d65876a1f5e6d1db4e6f40e4bRichard Smith // integral promotions. 6678ef7b203332b0c8d65876a1f5e6d1db4e6f40e4bRichard Smith // 6688ef7b203332b0c8d65876a1f5e6d1db4e6f40e4bRichard Smith // FIXME: This causes us to reject valid code: 6698ef7b203332b0c8d65876a1f5e6d1db4e6f40e4bRichard Smith // switch ((char)c) { case 256: case 0: return 0; } 6708ef7b203332b0c8d65876a1f5e6d1db4e6f40e4bRichard Smith // Here we claim there is a duplicated condition value, but there is not. 671f4021e7d5228a2be5a380269dffa0331a6c78b95Chris Lattner ConvertIntegerToTypeWarnOnOverflow(LoVal, CondWidth, CondIsSigned, 67228164ab2ac1deea68cdb989f941728bf1860ce41Gabor Greif Lo->getLocStart(), 673f4021e7d5228a2be5a380269dffa0331a6c78b95Chris Lattner diag::warn_case_value_overflow); 6746c36be5b383875b490684bcf439d6d427298c1afChris Lattner 6751e0a39012467b4f409142c32148036a9ee05e1d7Chris Lattner CS->setLHS(Lo); 6761eb4433ac451dc16f4133a88af2d002ac26c58efMike Stump 677b2ec9d6fede9cccc170a202de7bf7f523dea8be4Chris Lattner // If this is a case range, remember it in CaseRanges, otherwise CaseVals. 678dbb26db1d426fb6caaaf1b4fa47b46d1947c12c9Douglas Gregor if (CS->getRHS()) { 6791eb4433ac451dc16f4133a88af2d002ac26c58efMike Stump if (CS->getRHS()->isTypeDependent() || 680dbb26db1d426fb6caaaf1b4fa47b46d1947c12c9Douglas Gregor CS->getRHS()->isValueDependent()) { 681dbb26db1d426fb6caaaf1b4fa47b46d1947c12c9Douglas Gregor HasDependentValue = true; 682dbb26db1d426fb6caaaf1b4fa47b46d1947c12c9Douglas Gregor break; 683dbb26db1d426fb6caaaf1b4fa47b46d1947c12c9Douglas Gregor } 684f4021e7d5228a2be5a380269dffa0331a6c78b95Chris Lattner CaseRanges.push_back(std::make_pair(LoVal, CS)); 6851eb4433ac451dc16f4133a88af2d002ac26c58efMike Stump } else 686b2ec9d6fede9cccc170a202de7bf7f523dea8be4Chris Lattner CaseVals.push_back(std::make_pair(LoVal, CS)); 687f4021e7d5228a2be5a380269dffa0331a6c78b95Chris Lattner } 688f4021e7d5228a2be5a380269dffa0331a6c78b95Chris Lattner } 689b2ec9d6fede9cccc170a202de7bf7f523dea8be4Chris Lattner 690dbb26db1d426fb6caaaf1b4fa47b46d1947c12c9Douglas Gregor if (!HasDependentValue) { 6910fb97083cc0f8a82e404e22991ae80d2216e71d5John McCall // If we don't have a default statement, check whether the 6920fb97083cc0f8a82e404e22991ae80d2216e71d5John McCall // condition is constant. 6930fb97083cc0f8a82e404e22991ae80d2216e71d5John McCall llvm::APSInt ConstantCondValue; 6940fb97083cc0f8a82e404e22991ae80d2216e71d5John McCall bool HasConstantCond = false; 6950fb97083cc0f8a82e404e22991ae80d2216e71d5John McCall if (!HasDependentValue && !TheDefaultStmt) { 69651f4708c00110940ca3f337961915f2ca1668375Richard Smith HasConstantCond 69780d4b55db94db2172a04617d1a80feca6bbcea5cRichard Smith = CondExprBeforePromotion->EvaluateAsInt(ConstantCondValue, Context, 69880d4b55db94db2172a04617d1a80feca6bbcea5cRichard Smith Expr::SE_AllowSideEffects); 69980d4b55db94db2172a04617d1a80feca6bbcea5cRichard Smith assert(!HasConstantCond || 70080d4b55db94db2172a04617d1a80feca6bbcea5cRichard Smith (ConstantCondValue.getBitWidth() == CondWidth && 70180d4b55db94db2172a04617d1a80feca6bbcea5cRichard Smith ConstantCondValue.isSigned() == CondIsSigned)); 7020fb97083cc0f8a82e404e22991ae80d2216e71d5John McCall } 70380d4b55db94db2172a04617d1a80feca6bbcea5cRichard Smith bool ShouldCheckConstantCond = HasConstantCond; 7040fb97083cc0f8a82e404e22991ae80d2216e71d5John McCall 705dbb26db1d426fb6caaaf1b4fa47b46d1947c12c9Douglas Gregor // Sort all the scalar case values so we can easily detect duplicates. 706dbb26db1d426fb6caaaf1b4fa47b46d1947c12c9Douglas Gregor std::stable_sort(CaseVals.begin(), CaseVals.end(), CmpCaseVals); 707dbb26db1d426fb6caaaf1b4fa47b46d1947c12c9Douglas Gregor 708dbb26db1d426fb6caaaf1b4fa47b46d1947c12c9Douglas Gregor if (!CaseVals.empty()) { 7090fb97083cc0f8a82e404e22991ae80d2216e71d5John McCall for (unsigned i = 0, e = CaseVals.size(); i != e; ++i) { 7100fb97083cc0f8a82e404e22991ae80d2216e71d5John McCall if (ShouldCheckConstantCond && 7110fb97083cc0f8a82e404e22991ae80d2216e71d5John McCall CaseVals[i].first == ConstantCondValue) 7120fb97083cc0f8a82e404e22991ae80d2216e71d5John McCall ShouldCheckConstantCond = false; 7130fb97083cc0f8a82e404e22991ae80d2216e71d5John McCall 7140fb97083cc0f8a82e404e22991ae80d2216e71d5John McCall if (i != 0 && CaseVals[i].first == CaseVals[i-1].first) { 715dbb26db1d426fb6caaaf1b4fa47b46d1947c12c9Douglas Gregor // If we have a duplicate, report it. 7161eb4433ac451dc16f4133a88af2d002ac26c58efMike Stump Diag(CaseVals[i].second->getLHS()->getLocStart(), 7170fb97083cc0f8a82e404e22991ae80d2216e71d5John McCall diag::err_duplicate_case) << CaseVals[i].first.toString(10); 7180fb97083cc0f8a82e404e22991ae80d2216e71d5John McCall Diag(CaseVals[i-1].second->getLHS()->getLocStart(), 719dbb26db1d426fb6caaaf1b4fa47b46d1947c12c9Douglas Gregor diag::note_duplicate_case_prev); 720390b4cc8b45a05612349269ef08faab3e4688f06Mike Stump // FIXME: We really want to remove the bogus case stmt from the 721390b4cc8b45a05612349269ef08faab3e4688f06Mike Stump // substmt, but we have no way to do this right now. 722dbb26db1d426fb6caaaf1b4fa47b46d1947c12c9Douglas Gregor CaseListIsErroneous = true; 723dbb26db1d426fb6caaaf1b4fa47b46d1947c12c9Douglas Gregor } 7246efc4d3659632ddcea4a58cb62e9ee54ca4a373eChris Lattner } 725b2ec9d6fede9cccc170a202de7bf7f523dea8be4Chris Lattner } 7261eb4433ac451dc16f4133a88af2d002ac26c58efMike Stump 727dbb26db1d426fb6caaaf1b4fa47b46d1947c12c9Douglas Gregor // Detect duplicate case ranges, which usually don't exist at all in 728dbb26db1d426fb6caaaf1b4fa47b46d1947c12c9Douglas Gregor // the first place. 729dbb26db1d426fb6caaaf1b4fa47b46d1947c12c9Douglas Gregor if (!CaseRanges.empty()) { 730dbb26db1d426fb6caaaf1b4fa47b46d1947c12c9Douglas Gregor // Sort all the case ranges by their low value so we can easily detect 731dbb26db1d426fb6caaaf1b4fa47b46d1947c12c9Douglas Gregor // overlaps between ranges. 732dbb26db1d426fb6caaaf1b4fa47b46d1947c12c9Douglas Gregor std::stable_sort(CaseRanges.begin(), CaseRanges.end()); 7331eb4433ac451dc16f4133a88af2d002ac26c58efMike Stump 734dbb26db1d426fb6caaaf1b4fa47b46d1947c12c9Douglas Gregor // Scan the ranges, computing the high values and removing empty ranges. 735dbb26db1d426fb6caaaf1b4fa47b46d1947c12c9Douglas Gregor std::vector<llvm::APSInt> HiVals; 736dbb26db1d426fb6caaaf1b4fa47b46d1947c12c9Douglas Gregor for (unsigned i = 0, e = CaseRanges.size(); i != e; ++i) { 7370fb97083cc0f8a82e404e22991ae80d2216e71d5John McCall llvm::APSInt &LoVal = CaseRanges[i].first; 738dbb26db1d426fb6caaaf1b4fa47b46d1947c12c9Douglas Gregor CaseStmt *CR = CaseRanges[i].second; 739dbb26db1d426fb6caaaf1b4fa47b46d1947c12c9Douglas Gregor Expr *Hi = CR->getRHS(); 7408ef7b203332b0c8d65876a1f5e6d1db4e6f40e4bRichard Smith llvm::APSInt HiVal; 7418ef7b203332b0c8d65876a1f5e6d1db4e6f40e4bRichard Smith 7428ef7b203332b0c8d65876a1f5e6d1db4e6f40e4bRichard Smith if (getLangOptions().CPlusPlus0x) { 7438ef7b203332b0c8d65876a1f5e6d1db4e6f40e4bRichard Smith // C++11 [stmt.switch]p2: the constant-expression shall be a converted 7448ef7b203332b0c8d65876a1f5e6d1db4e6f40e4bRichard Smith // constant expression of the promoted type of the switch condition. 7458ef7b203332b0c8d65876a1f5e6d1db4e6f40e4bRichard Smith ExprResult ConvHi = 7468ef7b203332b0c8d65876a1f5e6d1db4e6f40e4bRichard Smith CheckConvertedConstantExpression(Hi, CondType, HiVal, 7478ef7b203332b0c8d65876a1f5e6d1db4e6f40e4bRichard Smith CCEK_CaseValue); 7488ef7b203332b0c8d65876a1f5e6d1db4e6f40e4bRichard Smith if (ConvHi.isInvalid()) { 7498ef7b203332b0c8d65876a1f5e6d1db4e6f40e4bRichard Smith CaseListIsErroneous = true; 7508ef7b203332b0c8d65876a1f5e6d1db4e6f40e4bRichard Smith continue; 7518ef7b203332b0c8d65876a1f5e6d1db4e6f40e4bRichard Smith } 7528ef7b203332b0c8d65876a1f5e6d1db4e6f40e4bRichard Smith Hi = ConvHi.take(); 7538ef7b203332b0c8d65876a1f5e6d1db4e6f40e4bRichard Smith } else { 7548ef7b203332b0c8d65876a1f5e6d1db4e6f40e4bRichard Smith HiVal = Hi->EvaluateKnownConstInt(Context); 7558ef7b203332b0c8d65876a1f5e6d1db4e6f40e4bRichard Smith 7568ef7b203332b0c8d65876a1f5e6d1db4e6f40e4bRichard Smith // If the RHS is not the same type as the condition, insert an 7578ef7b203332b0c8d65876a1f5e6d1db4e6f40e4bRichard Smith // implicit cast. 7588ef7b203332b0c8d65876a1f5e6d1db4e6f40e4bRichard Smith Hi = DefaultLvalueConversion(Hi).take(); 7598ef7b203332b0c8d65876a1f5e6d1db4e6f40e4bRichard Smith Hi = ImpCastExprToType(Hi, CondType, CK_IntegralCast).take(); 7608ef7b203332b0c8d65876a1f5e6d1db4e6f40e4bRichard Smith } 7611eb4433ac451dc16f4133a88af2d002ac26c58efMike Stump 762dbb26db1d426fb6caaaf1b4fa47b46d1947c12c9Douglas Gregor // Convert the value to the same width/sign as the condition. 763dbb26db1d426fb6caaaf1b4fa47b46d1947c12c9Douglas Gregor ConvertIntegerToTypeWarnOnOverflow(HiVal, CondWidth, CondIsSigned, 76428164ab2ac1deea68cdb989f941728bf1860ce41Gabor Greif Hi->getLocStart(), 765dbb26db1d426fb6caaaf1b4fa47b46d1947c12c9Douglas Gregor diag::warn_case_value_overflow); 7661eb4433ac451dc16f4133a88af2d002ac26c58efMike Stump 767dbb26db1d426fb6caaaf1b4fa47b46d1947c12c9Douglas Gregor CR->setRHS(Hi); 7681eb4433ac451dc16f4133a88af2d002ac26c58efMike Stump 769dbb26db1d426fb6caaaf1b4fa47b46d1947c12c9Douglas Gregor // If the low value is bigger than the high value, the case is empty. 7700fb97083cc0f8a82e404e22991ae80d2216e71d5John McCall if (LoVal > HiVal) { 771dbb26db1d426fb6caaaf1b4fa47b46d1947c12c9Douglas Gregor Diag(CR->getLHS()->getLocStart(), diag::warn_case_empty_range) 772dbb26db1d426fb6caaaf1b4fa47b46d1947c12c9Douglas Gregor << SourceRange(CR->getLHS()->getLocStart(), 77328164ab2ac1deea68cdb989f941728bf1860ce41Gabor Greif Hi->getLocEnd()); 774dbb26db1d426fb6caaaf1b4fa47b46d1947c12c9Douglas Gregor CaseRanges.erase(CaseRanges.begin()+i); 775dbb26db1d426fb6caaaf1b4fa47b46d1947c12c9Douglas Gregor --i, --e; 776dbb26db1d426fb6caaaf1b4fa47b46d1947c12c9Douglas Gregor continue; 777dbb26db1d426fb6caaaf1b4fa47b46d1947c12c9Douglas Gregor } 7780fb97083cc0f8a82e404e22991ae80d2216e71d5John McCall 7790fb97083cc0f8a82e404e22991ae80d2216e71d5John McCall if (ShouldCheckConstantCond && 7800fb97083cc0f8a82e404e22991ae80d2216e71d5John McCall LoVal <= ConstantCondValue && 7810fb97083cc0f8a82e404e22991ae80d2216e71d5John McCall ConstantCondValue <= HiVal) 7820fb97083cc0f8a82e404e22991ae80d2216e71d5John McCall ShouldCheckConstantCond = false; 7830fb97083cc0f8a82e404e22991ae80d2216e71d5John McCall 784dbb26db1d426fb6caaaf1b4fa47b46d1947c12c9Douglas Gregor HiVals.push_back(HiVal); 7850471f5bc8191e39cdb61fabcaf1870e2af2d42e8Chris Lattner } 7861eb4433ac451dc16f4133a88af2d002ac26c58efMike Stump 787dbb26db1d426fb6caaaf1b4fa47b46d1947c12c9Douglas Gregor // Rescan the ranges, looking for overlap with singleton values and other 788dbb26db1d426fb6caaaf1b4fa47b46d1947c12c9Douglas Gregor // ranges. Since the range list is sorted, we only need to compare case 789dbb26db1d426fb6caaaf1b4fa47b46d1947c12c9Douglas Gregor // ranges with their neighbors. 790dbb26db1d426fb6caaaf1b4fa47b46d1947c12c9Douglas Gregor for (unsigned i = 0, e = CaseRanges.size(); i != e; ++i) { 791dbb26db1d426fb6caaaf1b4fa47b46d1947c12c9Douglas Gregor llvm::APSInt &CRLo = CaseRanges[i].first; 792dbb26db1d426fb6caaaf1b4fa47b46d1947c12c9Douglas Gregor llvm::APSInt &CRHi = HiVals[i]; 793dbb26db1d426fb6caaaf1b4fa47b46d1947c12c9Douglas Gregor CaseStmt *CR = CaseRanges[i].second; 7941eb4433ac451dc16f4133a88af2d002ac26c58efMike Stump 795dbb26db1d426fb6caaaf1b4fa47b46d1947c12c9Douglas Gregor // Check to see whether the case range overlaps with any 796dbb26db1d426fb6caaaf1b4fa47b46d1947c12c9Douglas Gregor // singleton cases. 797dbb26db1d426fb6caaaf1b4fa47b46d1947c12c9Douglas Gregor CaseStmt *OverlapStmt = 0; 798dbb26db1d426fb6caaaf1b4fa47b46d1947c12c9Douglas Gregor llvm::APSInt OverlapVal(32); 7991eb4433ac451dc16f4133a88af2d002ac26c58efMike Stump 800dbb26db1d426fb6caaaf1b4fa47b46d1947c12c9Douglas Gregor // Find the smallest value >= the lower bound. If I is in the 801dbb26db1d426fb6caaaf1b4fa47b46d1947c12c9Douglas Gregor // case range, then we have overlap. 802dbb26db1d426fb6caaaf1b4fa47b46d1947c12c9Douglas Gregor CaseValsTy::iterator I = std::lower_bound(CaseVals.begin(), 803dbb26db1d426fb6caaaf1b4fa47b46d1947c12c9Douglas Gregor CaseVals.end(), CRLo, 804dbb26db1d426fb6caaaf1b4fa47b46d1947c12c9Douglas Gregor CaseCompareFunctor()); 805dbb26db1d426fb6caaaf1b4fa47b46d1947c12c9Douglas Gregor if (I != CaseVals.end() && I->first < CRHi) { 806dbb26db1d426fb6caaaf1b4fa47b46d1947c12c9Douglas Gregor OverlapVal = I->first; // Found overlap with scalar. 807dbb26db1d426fb6caaaf1b4fa47b46d1947c12c9Douglas Gregor OverlapStmt = I->second; 808dbb26db1d426fb6caaaf1b4fa47b46d1947c12c9Douglas Gregor } 8091eb4433ac451dc16f4133a88af2d002ac26c58efMike Stump 810dbb26db1d426fb6caaaf1b4fa47b46d1947c12c9Douglas Gregor // Find the smallest value bigger than the upper bound. 811dbb26db1d426fb6caaaf1b4fa47b46d1947c12c9Douglas Gregor I = std::upper_bound(I, CaseVals.end(), CRHi, CaseCompareFunctor()); 812dbb26db1d426fb6caaaf1b4fa47b46d1947c12c9Douglas Gregor if (I != CaseVals.begin() && (I-1)->first >= CRLo) { 813dbb26db1d426fb6caaaf1b4fa47b46d1947c12c9Douglas Gregor OverlapVal = (I-1)->first; // Found overlap with scalar. 814dbb26db1d426fb6caaaf1b4fa47b46d1947c12c9Douglas Gregor OverlapStmt = (I-1)->second; 815dbb26db1d426fb6caaaf1b4fa47b46d1947c12c9Douglas Gregor } 8161eb4433ac451dc16f4133a88af2d002ac26c58efMike Stump 817dbb26db1d426fb6caaaf1b4fa47b46d1947c12c9Douglas Gregor // Check to see if this case stmt overlaps with the subsequent 818dbb26db1d426fb6caaaf1b4fa47b46d1947c12c9Douglas Gregor // case range. 819dbb26db1d426fb6caaaf1b4fa47b46d1947c12c9Douglas Gregor if (i && CRLo <= HiVals[i-1]) { 820dbb26db1d426fb6caaaf1b4fa47b46d1947c12c9Douglas Gregor OverlapVal = HiVals[i-1]; // Found overlap with range. 821dbb26db1d426fb6caaaf1b4fa47b46d1947c12c9Douglas Gregor OverlapStmt = CaseRanges[i-1].second; 822dbb26db1d426fb6caaaf1b4fa47b46d1947c12c9Douglas Gregor } 8231eb4433ac451dc16f4133a88af2d002ac26c58efMike Stump 824dbb26db1d426fb6caaaf1b4fa47b46d1947c12c9Douglas Gregor if (OverlapStmt) { 825dbb26db1d426fb6caaaf1b4fa47b46d1947c12c9Douglas Gregor // If we have a duplicate, report it. 826dbb26db1d426fb6caaaf1b4fa47b46d1947c12c9Douglas Gregor Diag(CR->getLHS()->getLocStart(), diag::err_duplicate_case) 827dbb26db1d426fb6caaaf1b4fa47b46d1947c12c9Douglas Gregor << OverlapVal.toString(10); 8281eb4433ac451dc16f4133a88af2d002ac26c58efMike Stump Diag(OverlapStmt->getLHS()->getLocStart(), 829dbb26db1d426fb6caaaf1b4fa47b46d1947c12c9Douglas Gregor diag::note_duplicate_case_prev); 830390b4cc8b45a05612349269ef08faab3e4688f06Mike Stump // FIXME: We really want to remove the bogus case stmt from the 831390b4cc8b45a05612349269ef08faab3e4688f06Mike Stump // substmt, but we have no way to do this right now. 832dbb26db1d426fb6caaaf1b4fa47b46d1947c12c9Douglas Gregor CaseListIsErroneous = true; 833dbb26db1d426fb6caaaf1b4fa47b46d1947c12c9Douglas Gregor } 8340471f5bc8191e39cdb61fabcaf1870e2af2d42e8Chris Lattner } 835b2ec9d6fede9cccc170a202de7bf7f523dea8be4Chris Lattner } 836ba915af51ced751c46e7c2b9c6f3b59d2e668825Douglas Gregor 8370fb97083cc0f8a82e404e22991ae80d2216e71d5John McCall // Complain if we have a constant condition and we didn't find a match. 8380fb97083cc0f8a82e404e22991ae80d2216e71d5John McCall if (!CaseListIsErroneous && ShouldCheckConstantCond) { 8390fb97083cc0f8a82e404e22991ae80d2216e71d5John McCall // TODO: it would be nice if we printed enums as enums, chars as 8400fb97083cc0f8a82e404e22991ae80d2216e71d5John McCall // chars, etc. 8410fb97083cc0f8a82e404e22991ae80d2216e71d5John McCall Diag(CondExpr->getExprLoc(), diag::warn_missing_case_for_condition) 8420fb97083cc0f8a82e404e22991ae80d2216e71d5John McCall << ConstantCondValue.toString(10) 8430fb97083cc0f8a82e404e22991ae80d2216e71d5John McCall << CondExpr->getSourceRange(); 8440fb97083cc0f8a82e404e22991ae80d2216e71d5John McCall } 8450fb97083cc0f8a82e404e22991ae80d2216e71d5John McCall 8460fb97083cc0f8a82e404e22991ae80d2216e71d5John McCall // Check to see if switch is over an Enum and handles all of its 847559fb554602bedb57dbbf3cc14ac8a38264b4547Ted Kremenek // values. We only issue a warning if there is not 'default:', but 848559fb554602bedb57dbbf3cc14ac8a38264b4547Ted Kremenek // we still do the analysis to preserve this information in the AST 849559fb554602bedb57dbbf3cc14ac8a38264b4547Ted Kremenek // (which can be used by flow-based analyes). 8500fb97083cc0f8a82e404e22991ae80d2216e71d5John McCall // 851ce78461303f45fecb3460d1c49c9b71f27ad19c3Chris Lattner const EnumType *ET = CondTypeBeforePromotion->getAs<EnumType>(); 852559fb554602bedb57dbbf3cc14ac8a38264b4547Ted Kremenek 853ba915af51ced751c46e7c2b9c6f3b59d2e668825Douglas Gregor // If switch has default case, then ignore it. 854559fb554602bedb57dbbf3cc14ac8a38264b4547Ted Kremenek if (!CaseListIsErroneous && !HasConstantCond && ET) { 855ba915af51ced751c46e7c2b9c6f3b59d2e668825Douglas Gregor const EnumDecl *ED = ET->getDecl(); 8565f9e272e632e951b1efe824cd16acb4d96077930Chris Lattner typedef SmallVector<std::pair<llvm::APSInt, EnumConstantDecl*>, 64> 85758f14c012e5d739b09532bb12645dc161f88cfcfFrancois Pichet EnumValsTy; 858ba915af51ced751c46e7c2b9c6f3b59d2e668825Douglas Gregor EnumValsTy EnumVals; 859ba915af51ced751c46e7c2b9c6f3b59d2e668825Douglas Gregor 8600fb97083cc0f8a82e404e22991ae80d2216e71d5John McCall // Gather all enum values, set their type and sort them, 8610fb97083cc0f8a82e404e22991ae80d2216e71d5John McCall // allowing easier comparison with CaseVals. 8620fb97083cc0f8a82e404e22991ae80d2216e71d5John McCall for (EnumDecl::enumerator_iterator EDI = ED->enumerator_begin(); 86328164ab2ac1deea68cdb989f941728bf1860ce41Gabor Greif EDI != ED->enumerator_end(); ++EDI) { 86428164ab2ac1deea68cdb989f941728bf1860ce41Gabor Greif llvm::APSInt Val = EDI->getInitVal(); 86528164ab2ac1deea68cdb989f941728bf1860ce41Gabor Greif AdjustAPSInt(Val, CondWidth, CondIsSigned); 86628164ab2ac1deea68cdb989f941728bf1860ce41Gabor Greif EnumVals.push_back(std::make_pair(Val, *EDI)); 867ba915af51ced751c46e7c2b9c6f3b59d2e668825Douglas Gregor } 868ba915af51ced751c46e7c2b9c6f3b59d2e668825Douglas Gregor std::stable_sort(EnumVals.begin(), EnumVals.end(), CmpEnumVals); 8690fb97083cc0f8a82e404e22991ae80d2216e71d5John McCall EnumValsTy::iterator EIend = 8700fb97083cc0f8a82e404e22991ae80d2216e71d5John McCall std::unique(EnumVals.begin(), EnumVals.end(), EqEnumVals); 871559fb554602bedb57dbbf3cc14ac8a38264b4547Ted Kremenek 872559fb554602bedb57dbbf3cc14ac8a38264b4547Ted Kremenek // See which case values aren't in enum. 8739366750a5a97c8aeae1df4898ea849b087865195David Blaikie EnumValsTy::const_iterator EI = EnumVals.begin(); 8749366750a5a97c8aeae1df4898ea849b087865195David Blaikie for (CaseValsTy::const_iterator CI = CaseVals.begin(); 8759366750a5a97c8aeae1df4898ea849b087865195David Blaikie CI != CaseVals.end(); CI++) { 8769366750a5a97c8aeae1df4898ea849b087865195David Blaikie while (EI != EIend && EI->first < CI->first) 8779366750a5a97c8aeae1df4898ea849b087865195David Blaikie EI++; 8789366750a5a97c8aeae1df4898ea849b087865195David Blaikie if (EI == EIend || EI->first > CI->first) 8799366750a5a97c8aeae1df4898ea849b087865195David Blaikie Diag(CI->second->getLHS()->getExprLoc(), diag::warn_not_in_enum) 8809366750a5a97c8aeae1df4898ea849b087865195David Blaikie << ED->getDeclName(); 8819366750a5a97c8aeae1df4898ea849b087865195David Blaikie } 8829366750a5a97c8aeae1df4898ea849b087865195David Blaikie // See which of case ranges aren't in enum 8839366750a5a97c8aeae1df4898ea849b087865195David Blaikie EI = EnumVals.begin(); 8849366750a5a97c8aeae1df4898ea849b087865195David Blaikie for (CaseRangesTy::const_iterator RI = CaseRanges.begin(); 8859366750a5a97c8aeae1df4898ea849b087865195David Blaikie RI != CaseRanges.end() && EI != EIend; RI++) { 8869366750a5a97c8aeae1df4898ea849b087865195David Blaikie while (EI != EIend && EI->first < RI->first) 8879366750a5a97c8aeae1df4898ea849b087865195David Blaikie EI++; 8889366750a5a97c8aeae1df4898ea849b087865195David Blaikie 8899366750a5a97c8aeae1df4898ea849b087865195David Blaikie if (EI == EIend || EI->first != RI->first) { 8909366750a5a97c8aeae1df4898ea849b087865195David Blaikie Diag(RI->second->getLHS()->getExprLoc(), diag::warn_not_in_enum) 8919366750a5a97c8aeae1df4898ea849b087865195David Blaikie << ED->getDeclName(); 89247bb27f16882e4f5ababdd0cf6642bb904a9aaf8Ted Kremenek } 893e0ba9d1beeba01a96808c2fc61f9ca89acec313bTed Kremenek 8949366750a5a97c8aeae1df4898ea849b087865195David Blaikie llvm::APSInt Hi = 8959366750a5a97c8aeae1df4898ea849b087865195David Blaikie RI->second->getRHS()->EvaluateKnownConstInt(Context); 8969366750a5a97c8aeae1df4898ea849b087865195David Blaikie AdjustAPSInt(Hi, CondWidth, CondIsSigned); 8979366750a5a97c8aeae1df4898ea849b087865195David Blaikie while (EI != EIend && EI->first < Hi) 8989366750a5a97c8aeae1df4898ea849b087865195David Blaikie EI++; 8999366750a5a97c8aeae1df4898ea849b087865195David Blaikie if (EI == EIend || EI->first != Hi) 9009366750a5a97c8aeae1df4898ea849b087865195David Blaikie Diag(RI->second->getRHS()->getExprLoc(), diag::warn_not_in_enum) 9019366750a5a97c8aeae1df4898ea849b087865195David Blaikie << ED->getDeclName(); 902ba915af51ced751c46e7c2b9c6f3b59d2e668825Douglas Gregor } 903dfbb02a16ac8c764b5ba1742450513d6212d2f9fNAKAMURA Takumi 904559fb554602bedb57dbbf3cc14ac8a38264b4547Ted Kremenek // Check which enum vals aren't in switch 905ba915af51ced751c46e7c2b9c6f3b59d2e668825Douglas Gregor CaseValsTy::const_iterator CI = CaseVals.begin(); 906ba915af51ced751c46e7c2b9c6f3b59d2e668825Douglas Gregor CaseRangesTy::const_iterator RI = CaseRanges.begin(); 907559fb554602bedb57dbbf3cc14ac8a38264b4547Ted Kremenek bool hasCasesNotInSwitch = false; 908559fb554602bedb57dbbf3cc14ac8a38264b4547Ted Kremenek 9095f9e272e632e951b1efe824cd16acb4d96077930Chris Lattner SmallVector<DeclarationName,8> UnhandledNames; 910dfbb02a16ac8c764b5ba1742450513d6212d2f9fNAKAMURA Takumi 9119366750a5a97c8aeae1df4898ea849b087865195David Blaikie for (EI = EnumVals.begin(); EI != EIend; EI++){ 912ce78461303f45fecb3460d1c49c9b71f27ad19c3Chris Lattner // Drop unneeded case values 913ba915af51ced751c46e7c2b9c6f3b59d2e668825Douglas Gregor llvm::APSInt CIVal; 914ba915af51ced751c46e7c2b9c6f3b59d2e668825Douglas Gregor while (CI != CaseVals.end() && CI->first < EI->first) 915ba915af51ced751c46e7c2b9c6f3b59d2e668825Douglas Gregor CI++; 916dfbb02a16ac8c764b5ba1742450513d6212d2f9fNAKAMURA Takumi 917ba915af51ced751c46e7c2b9c6f3b59d2e668825Douglas Gregor if (CI != CaseVals.end() && CI->first == EI->first) 918ba915af51ced751c46e7c2b9c6f3b59d2e668825Douglas Gregor continue; 919ba915af51ced751c46e7c2b9c6f3b59d2e668825Douglas Gregor 920559fb554602bedb57dbbf3cc14ac8a38264b4547Ted Kremenek // Drop unneeded case ranges 921ba915af51ced751c46e7c2b9c6f3b59d2e668825Douglas Gregor for (; RI != CaseRanges.end(); RI++) { 922a6b8b2c09610b8bc4330e948ece8b940c2386406Richard Smith llvm::APSInt Hi = 923a6b8b2c09610b8bc4330e948ece8b940c2386406Richard Smith RI->second->getRHS()->EvaluateKnownConstInt(Context); 92428164ab2ac1deea68cdb989f941728bf1860ce41Gabor Greif AdjustAPSInt(Hi, CondWidth, CondIsSigned); 925ba915af51ced751c46e7c2b9c6f3b59d2e668825Douglas Gregor if (EI->first <= Hi) 926ba915af51ced751c46e7c2b9c6f3b59d2e668825Douglas Gregor break; 927ba915af51ced751c46e7c2b9c6f3b59d2e668825Douglas Gregor } 928ba915af51ced751c46e7c2b9c6f3b59d2e668825Douglas Gregor 929559fb554602bedb57dbbf3cc14ac8a38264b4547Ted Kremenek if (RI == CaseRanges.end() || EI->first < RI->first) { 93047bb27f16882e4f5ababdd0cf6642bb904a9aaf8Ted Kremenek hasCasesNotInSwitch = true; 93131ceb61172bca7ebc3fb90e9125864c7a29c55c0David Blaikie UnhandledNames.push_back(EI->second->getDeclName()); 93247bb27f16882e4f5ababdd0cf6642bb904a9aaf8Ted Kremenek } 933ba915af51ced751c46e7c2b9c6f3b59d2e668825Douglas Gregor } 934dfbb02a16ac8c764b5ba1742450513d6212d2f9fNAKAMURA Takumi 935585d7795c2dddaa510b3bb1b3b18633bfcfdf643David Blaikie if (TheDefaultStmt && UnhandledNames.empty()) 936585d7795c2dddaa510b3bb1b3b18633bfcfdf643David Blaikie Diag(TheDefaultStmt->getDefaultLoc(), diag::warn_unreachable_default); 93731ceb61172bca7ebc3fb90e9125864c7a29c55c0David Blaikie 938ce78461303f45fecb3460d1c49c9b71f27ad19c3Chris Lattner // Produce a nice diagnostic if multiple values aren't handled. 939ce78461303f45fecb3460d1c49c9b71f27ad19c3Chris Lattner switch (UnhandledNames.size()) { 940ce78461303f45fecb3460d1c49c9b71f27ad19c3Chris Lattner case 0: break; 941ce78461303f45fecb3460d1c49c9b71f27ad19c3Chris Lattner case 1: 942585d7795c2dddaa510b3bb1b3b18633bfcfdf643David Blaikie Diag(CondExpr->getExprLoc(), TheDefaultStmt 943585d7795c2dddaa510b3bb1b3b18633bfcfdf643David Blaikie ? diag::warn_def_missing_case1 : diag::warn_missing_case1) 944ce78461303f45fecb3460d1c49c9b71f27ad19c3Chris Lattner << UnhandledNames[0]; 945ce78461303f45fecb3460d1c49c9b71f27ad19c3Chris Lattner break; 946ce78461303f45fecb3460d1c49c9b71f27ad19c3Chris Lattner case 2: 947585d7795c2dddaa510b3bb1b3b18633bfcfdf643David Blaikie Diag(CondExpr->getExprLoc(), TheDefaultStmt 948585d7795c2dddaa510b3bb1b3b18633bfcfdf643David Blaikie ? diag::warn_def_missing_case2 : diag::warn_missing_case2) 949ce78461303f45fecb3460d1c49c9b71f27ad19c3Chris Lattner << UnhandledNames[0] << UnhandledNames[1]; 950ce78461303f45fecb3460d1c49c9b71f27ad19c3Chris Lattner break; 951ce78461303f45fecb3460d1c49c9b71f27ad19c3Chris Lattner case 3: 952585d7795c2dddaa510b3bb1b3b18633bfcfdf643David Blaikie Diag(CondExpr->getExprLoc(), TheDefaultStmt 953585d7795c2dddaa510b3bb1b3b18633bfcfdf643David Blaikie ? diag::warn_def_missing_case3 : diag::warn_missing_case3) 954ce78461303f45fecb3460d1c49c9b71f27ad19c3Chris Lattner << UnhandledNames[0] << UnhandledNames[1] << UnhandledNames[2]; 955ce78461303f45fecb3460d1c49c9b71f27ad19c3Chris Lattner break; 956ce78461303f45fecb3460d1c49c9b71f27ad19c3Chris Lattner default: 957585d7795c2dddaa510b3bb1b3b18633bfcfdf643David Blaikie Diag(CondExpr->getExprLoc(), TheDefaultStmt 958585d7795c2dddaa510b3bb1b3b18633bfcfdf643David Blaikie ? diag::warn_def_missing_cases : diag::warn_missing_cases) 959ce78461303f45fecb3460d1c49c9b71f27ad19c3Chris Lattner << (unsigned)UnhandledNames.size() 960ce78461303f45fecb3460d1c49c9b71f27ad19c3Chris Lattner << UnhandledNames[0] << UnhandledNames[1] << UnhandledNames[2]; 961ce78461303f45fecb3460d1c49c9b71f27ad19c3Chris Lattner break; 962ce78461303f45fecb3460d1c49c9b71f27ad19c3Chris Lattner } 963559fb554602bedb57dbbf3cc14ac8a38264b4547Ted Kremenek 964559fb554602bedb57dbbf3cc14ac8a38264b4547Ted Kremenek if (!hasCasesNotInSwitch) 96547bb27f16882e4f5ababdd0cf6642bb904a9aaf8Ted Kremenek SS->setAllEnumCasesCovered(); 966ba915af51ced751c46e7c2b9c6f3b59d2e668825Douglas Gregor } 967b2ec9d6fede9cccc170a202de7bf7f523dea8be4Chris Lattner } 968dbb26db1d426fb6caaaf1b4fa47b46d1947c12c9Douglas Gregor 969625bb569df0c34feec0d52c0ec5215f21ef2e054Dmitri Gribenko DiagnoseEmptyStmtBody(CondExpr->getLocEnd(), BodyStmt, 970625bb569df0c34feec0d52c0ec5215f21ef2e054Dmitri Gribenko diag::warn_empty_switch_body); 971625bb569df0c34feec0d52c0ec5215f21ef2e054Dmitri Gribenko 972390b4cc8b45a05612349269ef08faab3e4688f06Mike Stump // FIXME: If the case list was broken is some way, we don't have a good system 973390b4cc8b45a05612349269ef08faab3e4688f06Mike Stump // to patch it up. Instead, just return the whole substmt as broken. 974b2ec9d6fede9cccc170a202de7bf7f523dea8be4Chris Lattner if (CaseListIsErroneous) 975de307473448fb3cebcb4c10090728300b53bca03Sebastian Redl return StmtError(); 976de307473448fb3cebcb4c10090728300b53bca03Sebastian Redl 977de307473448fb3cebcb4c10090728300b53bca03Sebastian Redl return Owned(SS); 9785f016e2cb5d11daeb237544de1c5d59f20fe1a6eReid Spencer} 9795f016e2cb5d11daeb237544de1c5d59f20fe1a6eReid Spencer 98060d7b3a319d84d688752be3870615ac0f111fb16John McCallStmtResult 981dfbb02a16ac8c764b5ba1742450513d6212d2f9fNAKAMURA TakumiSema::ActOnWhileStmt(SourceLocation WhileLoc, FullExprArg Cond, 9829ae2f076ca5ab1feb3ba95629099ec2319833701John McCall Decl *CondVar, Stmt *Body) { 98360d7b3a319d84d688752be3870615ac0f111fb16John McCall ExprResult CondResult(Cond.release()); 984dfbb02a16ac8c764b5ba1742450513d6212d2f9fNAKAMURA Takumi 9855656e14d91405417182171a705ed3e3d2d6d7aa3Douglas Gregor VarDecl *ConditionVar = 0; 986d226f65006733ed7f709c3174f22ce33391cb58fJohn McCall if (CondVar) { 987d226f65006733ed7f709c3174f22ce33391cb58fJohn McCall ConditionVar = cast<VarDecl>(CondVar); 988586596fd7f7a336a2847b300c80614dcf39ab6d5Douglas Gregor CondResult = CheckConditionVariable(ConditionVar, WhileLoc, true); 98999e9b4d172f6877e6ba5ebe75bb8238721f5e01cDouglas Gregor if (CondResult.isInvalid()) 99099e9b4d172f6877e6ba5ebe75bb8238721f5e01cDouglas Gregor return StmtError(); 9915656e14d91405417182171a705ed3e3d2d6d7aa3Douglas Gregor } 9929ae2f076ca5ab1feb3ba95629099ec2319833701John McCall Expr *ConditionExpr = CondResult.take(); 99399e9b4d172f6877e6ba5ebe75bb8238721f5e01cDouglas Gregor if (!ConditionExpr) 99499e9b4d172f6877e6ba5ebe75bb8238721f5e01cDouglas Gregor return StmtError(); 995dfbb02a16ac8c764b5ba1742450513d6212d2f9fNAKAMURA Takumi 9969ae2f076ca5ab1feb3ba95629099ec2319833701John McCall DiagnoseUnusedExprResult(Body); 9971eb4433ac451dc16f4133a88af2d002ac26c58efMike Stump 998625bb569df0c34feec0d52c0ec5215f21ef2e054Dmitri Gribenko if (isa<NullStmt>(Body)) 999625bb569df0c34feec0d52c0ec5215f21ef2e054Dmitri Gribenko getCurCompoundScope().setHasEmptyLoopBodies(); 1000625bb569df0c34feec0d52c0ec5215f21ef2e054Dmitri Gribenko 100143dec6bbde2d0a16c35978983761c8b7030c8e18Douglas Gregor return Owned(new (Context) WhileStmt(Context, ConditionVar, ConditionExpr, 10029ae2f076ca5ab1feb3ba95629099ec2319833701John McCall Body, WhileLoc)); 10035f016e2cb5d11daeb237544de1c5d59f20fe1a6eReid Spencer} 10045f016e2cb5d11daeb237544de1c5d59f20fe1a6eReid Spencer 100560d7b3a319d84d688752be3870615ac0f111fb16John McCallStmtResult 10069ae2f076ca5ab1feb3ba95629099ec2319833701John McCallSema::ActOnDoStmt(SourceLocation DoLoc, Stmt *Body, 1007989135901c750af61ef012b6b0a0368be415bc46Chris Lattner SourceLocation WhileLoc, SourceLocation CondLParen, 10089ae2f076ca5ab1feb3ba95629099ec2319833701John McCall Expr *Cond, SourceLocation CondRParen) { 10099ae2f076ca5ab1feb3ba95629099ec2319833701John McCall assert(Cond && "ActOnDoStmt(): missing expression"); 1010f05b1520d6f175acbfc3913489f4dfa842875ec4Sebastian Redl 1011429bb276991ff2dbc7c5b438828b9b7737cb15ebJohn Wiegley ExprResult CondResult = CheckBooleanCondition(Cond, DoLoc); 1012429bb276991ff2dbc7c5b438828b9b7737cb15ebJohn Wiegley if (CondResult.isInvalid() || CondResult.isInvalid()) 10135a881bb09928b7ade891efc680088aaad276f8d6John McCall return StmtError(); 1014429bb276991ff2dbc7c5b438828b9b7737cb15ebJohn Wiegley Cond = CondResult.take(); 10155f016e2cb5d11daeb237544de1c5d59f20fe1a6eReid Spencer 1016b4eb64d8426c0eaa58d398961e0e74ff85063d7cJohn McCall CheckImplicitConversions(Cond, DoLoc); 1017429bb276991ff2dbc7c5b438828b9b7737cb15ebJohn Wiegley CondResult = MaybeCreateExprWithCleanups(Cond); 10189ae2f076ca5ab1feb3ba95629099ec2319833701John McCall if (CondResult.isInvalid()) 1019586596fd7f7a336a2847b300c80614dcf39ab6d5Douglas Gregor return StmtError(); 10209ae2f076ca5ab1feb3ba95629099ec2319833701John McCall Cond = CondResult.take(); 1021dfbb02a16ac8c764b5ba1742450513d6212d2f9fNAKAMURA Takumi 10229ae2f076ca5ab1feb3ba95629099ec2319833701John McCall DiagnoseUnusedExprResult(Body); 1023754431107b61a0523df5271c2876a73dd5a051e9Anders Carlsson 10249ae2f076ca5ab1feb3ba95629099ec2319833701John McCall return Owned(new (Context) DoStmt(Body, Cond, DoLoc, WhileLoc, CondRParen)); 10255f016e2cb5d11daeb237544de1c5d59f20fe1a6eReid Spencer} 10265f016e2cb5d11daeb237544de1c5d59f20fe1a6eReid Spencer 102760d7b3a319d84d688752be3870615ac0f111fb16John McCallStmtResult 1028f05b1520d6f175acbfc3913489f4dfa842875ec4Sebastian RedlSema::ActOnForStmt(SourceLocation ForLoc, SourceLocation LParenLoc, 10299ae2f076ca5ab1feb3ba95629099ec2319833701John McCall Stmt *First, FullExprArg second, Decl *secondVar, 103099e9b4d172f6877e6ba5ebe75bb8238721f5e01cDouglas Gregor FullExprArg third, 10319ae2f076ca5ab1feb3ba95629099ec2319833701John McCall SourceLocation RParenLoc, Stmt *Body) { 10325921093cf1c2e9a8bd1a22b6f612e551bae7476bArgyrios Kyrtzidis if (!getLangOptions().CPlusPlus) { 10335921093cf1c2e9a8bd1a22b6f612e551bae7476bArgyrios Kyrtzidis if (DeclStmt *DS = dyn_cast_or_null<DeclStmt>(First)) { 1034f3a41af4d5c98a72a1d6720bbbfd658e57ef2541Chris Lattner // C99 6.8.5p3: The declaration part of a 'for' statement shall only 1035f3a41af4d5c98a72a1d6720bbbfd658e57ef2541Chris Lattner // declare identifiers for objects having storage class 'auto' or 1036f3a41af4d5c98a72a1d6720bbbfd658e57ef2541Chris Lattner // 'register'. 10375921093cf1c2e9a8bd1a22b6f612e551bae7476bArgyrios Kyrtzidis for (DeclStmt::decl_iterator DI=DS->decl_begin(), DE=DS->decl_end(); 10385921093cf1c2e9a8bd1a22b6f612e551bae7476bArgyrios Kyrtzidis DI!=DE; ++DI) { 10395921093cf1c2e9a8bd1a22b6f612e551bae7476bArgyrios Kyrtzidis VarDecl *VD = dyn_cast<VarDecl>(*DI); 1040b6bbcc9995186799a60ce17d0c1acff31601653aJohn McCall if (VD && VD->isLocalVarDecl() && !VD->hasLocalStorage()) 10415921093cf1c2e9a8bd1a22b6f612e551bae7476bArgyrios Kyrtzidis VD = 0; 10425921093cf1c2e9a8bd1a22b6f612e551bae7476bArgyrios Kyrtzidis if (VD == 0) 10435921093cf1c2e9a8bd1a22b6f612e551bae7476bArgyrios Kyrtzidis Diag((*DI)->getLocation(), diag::err_non_variable_decl_in_for); 10445921093cf1c2e9a8bd1a22b6f612e551bae7476bArgyrios Kyrtzidis // FIXME: mark decl erroneous! 10455921093cf1c2e9a8bd1a22b6f612e551bae7476bArgyrios Kyrtzidis } 1046ae3b701f59e78e058b83344be17206af3bf5d277Chris Lattner } 10475f016e2cb5d11daeb237544de1c5d59f20fe1a6eReid Spencer } 104899e9b4d172f6877e6ba5ebe75bb8238721f5e01cDouglas Gregor 104960d7b3a319d84d688752be3870615ac0f111fb16John McCall ExprResult SecondResult(second.release()); 105099e9b4d172f6877e6ba5ebe75bb8238721f5e01cDouglas Gregor VarDecl *ConditionVar = 0; 1051d226f65006733ed7f709c3174f22ce33391cb58fJohn McCall if (secondVar) { 1052d226f65006733ed7f709c3174f22ce33391cb58fJohn McCall ConditionVar = cast<VarDecl>(secondVar); 1053586596fd7f7a336a2847b300c80614dcf39ab6d5Douglas Gregor SecondResult = CheckConditionVariable(ConditionVar, ForLoc, true); 105499e9b4d172f6877e6ba5ebe75bb8238721f5e01cDouglas Gregor if (SecondResult.isInvalid()) 105599e9b4d172f6877e6ba5ebe75bb8238721f5e01cDouglas Gregor return StmtError(); 105699e9b4d172f6877e6ba5ebe75bb8238721f5e01cDouglas Gregor } 1057dfbb02a16ac8c764b5ba1742450513d6212d2f9fNAKAMURA Takumi 105899e9b4d172f6877e6ba5ebe75bb8238721f5e01cDouglas Gregor Expr *Third = third.release().takeAs<Expr>(); 1059dfbb02a16ac8c764b5ba1742450513d6212d2f9fNAKAMURA Takumi 10603af708ff19e4ae2bf9e40550548361b00e5916bfAnders Carlsson DiagnoseUnusedExprResult(First); 10613af708ff19e4ae2bf9e40550548361b00e5916bfAnders Carlsson DiagnoseUnusedExprResult(Third); 1062754431107b61a0523df5271c2876a73dd5a051e9Anders Carlsson DiagnoseUnusedExprResult(Body); 1063754431107b61a0523df5271c2876a73dd5a051e9Anders Carlsson 1064625bb569df0c34feec0d52c0ec5215f21ef2e054Dmitri Gribenko if (isa<NullStmt>(Body)) 1065625bb569df0c34feec0d52c0ec5215f21ef2e054Dmitri Gribenko getCurCompoundScope().setHasEmptyLoopBodies(); 1066625bb569df0c34feec0d52c0ec5215f21ef2e054Dmitri Gribenko 1067dfbb02a16ac8c764b5ba1742450513d6212d2f9fNAKAMURA Takumi return Owned(new (Context) ForStmt(Context, First, 1068dfbb02a16ac8c764b5ba1742450513d6212d2f9fNAKAMURA Takumi SecondResult.take(), ConditionVar, 1069dfbb02a16ac8c764b5ba1742450513d6212d2f9fNAKAMURA Takumi Third, Body, ForLoc, LParenLoc, 107043dec6bbde2d0a16c35978983761c8b7030c8e18Douglas Gregor RParenLoc)); 10715f016e2cb5d11daeb237544de1c5d59f20fe1a6eReid Spencer} 10725f016e2cb5d11daeb237544de1c5d59f20fe1a6eReid Spencer 1073f6a1648197562e0b133440d612d9af297d0a86ccJohn McCall/// In an Objective C collection iteration statement: 1074f6a1648197562e0b133440d612d9af297d0a86ccJohn McCall/// for (x in y) 1075f6a1648197562e0b133440d612d9af297d0a86ccJohn McCall/// x can be an arbitrary l-value expression. Bind it up as a 1076f6a1648197562e0b133440d612d9af297d0a86ccJohn McCall/// full-expression. 1077f6a1648197562e0b133440d612d9af297d0a86ccJohn McCallStmtResult Sema::ActOnForEachLValueExpr(Expr *E) { 1078f6a1648197562e0b133440d612d9af297d0a86ccJohn McCall CheckImplicitConversions(E); 10794765fa05b5652fcc4356371c2f481d0ea9a1b007John McCall ExprResult Result = MaybeCreateExprWithCleanups(E); 1080f6a1648197562e0b133440d612d9af297d0a86ccJohn McCall if (Result.isInvalid()) return StmtError(); 1081f6a1648197562e0b133440d612d9af297d0a86ccJohn McCall return Owned(static_cast<Stmt*>(Result.get())); 1082f6a1648197562e0b133440d612d9af297d0a86ccJohn McCall} 1083f6a1648197562e0b133440d612d9af297d0a86ccJohn McCall 1084990567cb60e8530ba01b41d4e056e32b44b95ec0John McCallExprResult 1085990567cb60e8530ba01b41d4e056e32b44b95ec0John McCallSema::ActOnObjCForCollectionOperand(SourceLocation forLoc, Expr *collection) { 1086990567cb60e8530ba01b41d4e056e32b44b95ec0John McCall assert(collection); 1087990567cb60e8530ba01b41d4e056e32b44b95ec0John McCall 1088990567cb60e8530ba01b41d4e056e32b44b95ec0John McCall // Bail out early if we've got a type-dependent expression. 1089990567cb60e8530ba01b41d4e056e32b44b95ec0John McCall if (collection->isTypeDependent()) return Owned(collection); 1090990567cb60e8530ba01b41d4e056e32b44b95ec0John McCall 1091990567cb60e8530ba01b41d4e056e32b44b95ec0John McCall // Perform normal l-value conversion. 1092990567cb60e8530ba01b41d4e056e32b44b95ec0John McCall ExprResult result = DefaultFunctionArrayLvalueConversion(collection); 1093990567cb60e8530ba01b41d4e056e32b44b95ec0John McCall if (result.isInvalid()) 1094990567cb60e8530ba01b41d4e056e32b44b95ec0John McCall return ExprError(); 1095990567cb60e8530ba01b41d4e056e32b44b95ec0John McCall collection = result.take(); 1096990567cb60e8530ba01b41d4e056e32b44b95ec0John McCall 1097990567cb60e8530ba01b41d4e056e32b44b95ec0John McCall // The operand needs to have object-pointer type. 1098990567cb60e8530ba01b41d4e056e32b44b95ec0John McCall // TODO: should we do a contextual conversion? 1099990567cb60e8530ba01b41d4e056e32b44b95ec0John McCall const ObjCObjectPointerType *pointerType = 1100990567cb60e8530ba01b41d4e056e32b44b95ec0John McCall collection->getType()->getAs<ObjCObjectPointerType>(); 1101990567cb60e8530ba01b41d4e056e32b44b95ec0John McCall if (!pointerType) 1102990567cb60e8530ba01b41d4e056e32b44b95ec0John McCall return Diag(forLoc, diag::err_collection_expr_type) 1103990567cb60e8530ba01b41d4e056e32b44b95ec0John McCall << collection->getType() << collection->getSourceRange(); 1104990567cb60e8530ba01b41d4e056e32b44b95ec0John McCall 1105990567cb60e8530ba01b41d4e056e32b44b95ec0John McCall // Check that the operand provides 1106990567cb60e8530ba01b41d4e056e32b44b95ec0John McCall // - countByEnumeratingWithState:objects:count: 1107990567cb60e8530ba01b41d4e056e32b44b95ec0John McCall const ObjCObjectType *objectType = pointerType->getObjectType(); 1108990567cb60e8530ba01b41d4e056e32b44b95ec0John McCall ObjCInterfaceDecl *iface = objectType->getInterface(); 1109990567cb60e8530ba01b41d4e056e32b44b95ec0John McCall 1110990567cb60e8530ba01b41d4e056e32b44b95ec0John McCall // If we have a forward-declared type, we can't do this check. 1111b3029960632ca8a3248e74770eda64d6c16f7246Douglas Gregor // Under ARC, it is an error not to have a forward-declared class. 1112b3029960632ca8a3248e74770eda64d6c16f7246Douglas Gregor if (iface && 1113b3029960632ca8a3248e74770eda64d6c16f7246Douglas Gregor RequireCompleteType(forLoc, QualType(objectType, 0), 1114b3029960632ca8a3248e74770eda64d6c16f7246Douglas Gregor getLangOptions().ObjCAutoRefCount 1115b3029960632ca8a3248e74770eda64d6c16f7246Douglas Gregor ? PDiag(diag::err_arc_collection_forward) 1116b3029960632ca8a3248e74770eda64d6c16f7246Douglas Gregor << collection->getSourceRange() 1117b3029960632ca8a3248e74770eda64d6c16f7246Douglas Gregor : PDiag(0))) { 1118990567cb60e8530ba01b41d4e056e32b44b95ec0John McCall // Otherwise, if we have any useful type information, check that 1119990567cb60e8530ba01b41d4e056e32b44b95ec0John McCall // the type declares the appropriate method. 1120990567cb60e8530ba01b41d4e056e32b44b95ec0John McCall } else if (iface || !objectType->qual_empty()) { 1121990567cb60e8530ba01b41d4e056e32b44b95ec0John McCall IdentifierInfo *selectorIdents[] = { 1122990567cb60e8530ba01b41d4e056e32b44b95ec0John McCall &Context.Idents.get("countByEnumeratingWithState"), 1123990567cb60e8530ba01b41d4e056e32b44b95ec0John McCall &Context.Idents.get("objects"), 1124990567cb60e8530ba01b41d4e056e32b44b95ec0John McCall &Context.Idents.get("count") 1125990567cb60e8530ba01b41d4e056e32b44b95ec0John McCall }; 1126990567cb60e8530ba01b41d4e056e32b44b95ec0John McCall Selector selector = Context.Selectors.getSelector(3, &selectorIdents[0]); 1127990567cb60e8530ba01b41d4e056e32b44b95ec0John McCall 1128990567cb60e8530ba01b41d4e056e32b44b95ec0John McCall ObjCMethodDecl *method = 0; 1129990567cb60e8530ba01b41d4e056e32b44b95ec0John McCall 1130990567cb60e8530ba01b41d4e056e32b44b95ec0John McCall // If there's an interface, look in both the public and private APIs. 1131990567cb60e8530ba01b41d4e056e32b44b95ec0John McCall if (iface) { 1132990567cb60e8530ba01b41d4e056e32b44b95ec0John McCall method = iface->lookupInstanceMethod(selector); 1133990567cb60e8530ba01b41d4e056e32b44b95ec0John McCall if (!method) method = LookupPrivateInstanceMethod(selector, iface); 1134990567cb60e8530ba01b41d4e056e32b44b95ec0John McCall } 1135990567cb60e8530ba01b41d4e056e32b44b95ec0John McCall 1136990567cb60e8530ba01b41d4e056e32b44b95ec0John McCall // Also check protocol qualifiers. 1137990567cb60e8530ba01b41d4e056e32b44b95ec0John McCall if (!method) 1138990567cb60e8530ba01b41d4e056e32b44b95ec0John McCall method = LookupMethodInQualifiedType(selector, pointerType, 1139990567cb60e8530ba01b41d4e056e32b44b95ec0John McCall /*instance*/ true); 1140990567cb60e8530ba01b41d4e056e32b44b95ec0John McCall 1141990567cb60e8530ba01b41d4e056e32b44b95ec0John McCall // If we didn't find it anywhere, give up. 1142990567cb60e8530ba01b41d4e056e32b44b95ec0John McCall if (!method) { 1143990567cb60e8530ba01b41d4e056e32b44b95ec0John McCall Diag(forLoc, diag::warn_collection_expr_type) 1144990567cb60e8530ba01b41d4e056e32b44b95ec0John McCall << collection->getType() << selector << collection->getSourceRange(); 1145990567cb60e8530ba01b41d4e056e32b44b95ec0John McCall } 1146990567cb60e8530ba01b41d4e056e32b44b95ec0John McCall 1147990567cb60e8530ba01b41d4e056e32b44b95ec0John McCall // TODO: check for an incompatible signature? 1148990567cb60e8530ba01b41d4e056e32b44b95ec0John McCall } 1149990567cb60e8530ba01b41d4e056e32b44b95ec0John McCall 1150990567cb60e8530ba01b41d4e056e32b44b95ec0John McCall // Wrap up any cleanups in the expression. 1151990567cb60e8530ba01b41d4e056e32b44b95ec0John McCall return Owned(MaybeCreateExprWithCleanups(collection)); 1152990567cb60e8530ba01b41d4e056e32b44b95ec0John McCall} 1153990567cb60e8530ba01b41d4e056e32b44b95ec0John McCall 115460d7b3a319d84d688752be3870615ac0f111fb16John McCallStmtResult 1155f05b1520d6f175acbfc3913489f4dfa842875ec4Sebastian RedlSema::ActOnObjCForCollectionStmt(SourceLocation ForLoc, 1156f05b1520d6f175acbfc3913489f4dfa842875ec4Sebastian Redl SourceLocation LParenLoc, 11579ae2f076ca5ab1feb3ba95629099ec2319833701John McCall Stmt *First, Expr *Second, 11589ae2f076ca5ab1feb3ba95629099ec2319833701John McCall SourceLocation RParenLoc, Stmt *Body) { 115920552d2842245692b649e0d25380670922f954a2Fariborz Jahanian if (First) { 116020552d2842245692b649e0d25380670922f954a2Fariborz Jahanian QualType FirstType; 116120552d2842245692b649e0d25380670922f954a2Fariborz Jahanian if (DeclStmt *DS = dyn_cast<DeclStmt>(First)) { 11627e24e82a70a2c681f4291a3397bcd1e1005f251aChris Lattner if (!DS->isSingleDecl()) 1163f05b1520d6f175acbfc3913489f4dfa842875ec4Sebastian Redl return StmtError(Diag((*DS->decl_begin())->getLocation(), 1164f05b1520d6f175acbfc3913489f4dfa842875ec4Sebastian Redl diag::err_toomany_element_decls)); 1165f05b1520d6f175acbfc3913489f4dfa842875ec4Sebastian Redl 1166f85e193739c953358c865005855253af4f68a497John McCall VarDecl *D = cast<VarDecl>(DS->getSingleDecl()); 1167f85e193739c953358c865005855253af4f68a497John McCall FirstType = D->getType(); 1168f3a41af4d5c98a72a1d6720bbbfd658e57ef2541Chris Lattner // C99 6.8.5p3: The declaration part of a 'for' statement shall only 1169f3a41af4d5c98a72a1d6720bbbfd658e57ef2541Chris Lattner // declare identifiers for objects having storage class 'auto' or 1170f3a41af4d5c98a72a1d6720bbbfd658e57ef2541Chris Lattner // 'register'. 1171f85e193739c953358c865005855253af4f68a497John McCall if (!D->hasLocalStorage()) 1172f85e193739c953358c865005855253af4f68a497John McCall return StmtError(Diag(D->getLocation(), 1173f05b1520d6f175acbfc3913489f4dfa842875ec4Sebastian Redl diag::err_non_variable_decl_in_for)); 11741fe379f0fa6fbc0a6057e8966253aea2957ca953Anders Carlsson } else { 1175c3203e7ee1464a096f341c2e2a83a10be2da000aDouglas Gregor Expr *FirstE = cast<Expr>(First); 11767eb0a9eb0cde8444b97f9c5b713d9be7a6f1e607John McCall if (!FirstE->isTypeDependent() && !FirstE->isLValue()) 1177f05b1520d6f175acbfc3913489f4dfa842875ec4Sebastian Redl return StmtError(Diag(First->getLocStart(), 1178f05b1520d6f175acbfc3913489f4dfa842875ec4Sebastian Redl diag::err_selector_element_not_lvalue) 1179f05b1520d6f175acbfc3913489f4dfa842875ec4Sebastian Redl << First->getSourceRange()); 11801fe379f0fa6fbc0a6057e8966253aea2957ca953Anders Carlsson 11811eb4433ac451dc16f4133a88af2d002ac26c58efMike Stump FirstType = static_cast<Expr*>(First)->getType(); 11821fe379f0fa6fbc0a6057e8966253aea2957ca953Anders Carlsson } 1183c3203e7ee1464a096f341c2e2a83a10be2da000aDouglas Gregor if (!FirstType->isDependentType() && 1184c3203e7ee1464a096f341c2e2a83a10be2da000aDouglas Gregor !FirstType->isObjCObjectPointerType() && 1185a5e42a82ce055f29f3733f3a1f10da6cb9877deeFariborz Jahanian !FirstType->isBlockPointerType()) 1186dcd5ef12488e4c7ea844327835896ca86b609a97Chris Lattner Diag(ForLoc, diag::err_selector_element_type) 1187d162584991885ab004a02573a73ce06422b921fcChris Lattner << FirstType << First->getSourceRange(); 11883ba5a0f90a03d5e13d02cbee9abd2a1ba01b18bcFariborz Jahanian } 1189990567cb60e8530ba01b41d4e056e32b44b95ec0John McCall 11908189cde56b4f6f938cd65f53c932fe1860d0204cTed Kremenek return Owned(new (Context) ObjCForCollectionStmt(First, Second, Body, 11918189cde56b4f6f938cd65f53c932fe1860d0204cTed Kremenek ForLoc, RParenLoc)); 11923ba5a0f90a03d5e13d02cbee9abd2a1ba01b18bcFariborz Jahanian} 11935f016e2cb5d11daeb237544de1c5d59f20fe1a6eReid Spencer 1194ad762fcdc16b9e4705b12b09d92b8c026212b906Richard Smithnamespace { 1195ad762fcdc16b9e4705b12b09d92b8c026212b906Richard Smith 1196ad762fcdc16b9e4705b12b09d92b8c026212b906Richard Smithenum BeginEndFunction { 1197ad762fcdc16b9e4705b12b09d92b8c026212b906Richard Smith BEF_begin, 1198ad762fcdc16b9e4705b12b09d92b8c026212b906Richard Smith BEF_end 1199ad762fcdc16b9e4705b12b09d92b8c026212b906Richard Smith}; 1200ad762fcdc16b9e4705b12b09d92b8c026212b906Richard Smith 1201ad762fcdc16b9e4705b12b09d92b8c026212b906Richard Smith/// Build a variable declaration for a for-range statement. 1202ad762fcdc16b9e4705b12b09d92b8c026212b906Richard Smithstatic VarDecl *BuildForRangeVarDecl(Sema &SemaRef, SourceLocation Loc, 1203ad762fcdc16b9e4705b12b09d92b8c026212b906Richard Smith QualType Type, const char *Name) { 1204ad762fcdc16b9e4705b12b09d92b8c026212b906Richard Smith DeclContext *DC = SemaRef.CurContext; 1205ad762fcdc16b9e4705b12b09d92b8c026212b906Richard Smith IdentifierInfo *II = &SemaRef.PP.getIdentifierTable().get(Name); 1206ad762fcdc16b9e4705b12b09d92b8c026212b906Richard Smith TypeSourceInfo *TInfo = SemaRef.Context.getTrivialTypeSourceInfo(Type, Loc); 1207ad762fcdc16b9e4705b12b09d92b8c026212b906Richard Smith VarDecl *Decl = VarDecl::Create(SemaRef.Context, DC, Loc, Loc, II, Type, 1208ad762fcdc16b9e4705b12b09d92b8c026212b906Richard Smith TInfo, SC_Auto, SC_None); 1209b403d6d746239095a2c7bac958c924d92434e2b4Richard Smith Decl->setImplicit(); 1210ad762fcdc16b9e4705b12b09d92b8c026212b906Richard Smith return Decl; 1211ad762fcdc16b9e4705b12b09d92b8c026212b906Richard Smith} 1212ad762fcdc16b9e4705b12b09d92b8c026212b906Richard Smith 1213ad762fcdc16b9e4705b12b09d92b8c026212b906Richard Smith/// Finish building a variable declaration for a for-range statement. 1214ad762fcdc16b9e4705b12b09d92b8c026212b906Richard Smith/// \return true if an error occurs. 1215ad762fcdc16b9e4705b12b09d92b8c026212b906Richard Smithstatic bool FinishForRangeVarDecl(Sema &SemaRef, VarDecl *Decl, Expr *Init, 1216ad762fcdc16b9e4705b12b09d92b8c026212b906Richard Smith SourceLocation Loc, int diag) { 1217ad762fcdc16b9e4705b12b09d92b8c026212b906Richard Smith // Deduce the type for the iterator variable now rather than leaving it to 1218ad762fcdc16b9e4705b12b09d92b8c026212b906Richard Smith // AddInitializerToDecl, so we can produce a more suitable diagnostic. 1219ad762fcdc16b9e4705b12b09d92b8c026212b906Richard Smith TypeSourceInfo *InitTSI = 0; 122062b7cfb73e202051e7ab0dad42ba213acd0dec7eSebastian Redl if ((!isa<InitListExpr>(Init) && Init->getType()->isVoidType()) || 1221b832f6dea893f25b40500a04781286236281cb20Sebastian Redl SemaRef.DeduceAutoType(Decl->getTypeSourceInfo(), Init, InitTSI) == 1222b832f6dea893f25b40500a04781286236281cb20Sebastian Redl Sema::DAR_Failed) 1223ad762fcdc16b9e4705b12b09d92b8c026212b906Richard Smith SemaRef.Diag(Loc, diag) << Init->getType(); 1224ad762fcdc16b9e4705b12b09d92b8c026212b906Richard Smith if (!InitTSI) { 1225ad762fcdc16b9e4705b12b09d92b8c026212b906Richard Smith Decl->setInvalidDecl(); 1226ad762fcdc16b9e4705b12b09d92b8c026212b906Richard Smith return true; 1227ad762fcdc16b9e4705b12b09d92b8c026212b906Richard Smith } 1228ad762fcdc16b9e4705b12b09d92b8c026212b906Richard Smith Decl->setTypeSourceInfo(InitTSI); 1229ad762fcdc16b9e4705b12b09d92b8c026212b906Richard Smith Decl->setType(InitTSI->getType()); 1230ad762fcdc16b9e4705b12b09d92b8c026212b906Richard Smith 1231f85e193739c953358c865005855253af4f68a497John McCall // In ARC, infer lifetime. 1232f85e193739c953358c865005855253af4f68a497John McCall // FIXME: ARC may want to turn this into 'const __unsafe_unretained' if 1233f85e193739c953358c865005855253af4f68a497John McCall // we're doing the equivalent of fast iteration. 1234f85e193739c953358c865005855253af4f68a497John McCall if (SemaRef.getLangOptions().ObjCAutoRefCount && 1235f85e193739c953358c865005855253af4f68a497John McCall SemaRef.inferObjCARCLifetime(Decl)) 1236f85e193739c953358c865005855253af4f68a497John McCall Decl->setInvalidDecl(); 1237f85e193739c953358c865005855253af4f68a497John McCall 1238ad762fcdc16b9e4705b12b09d92b8c026212b906Richard Smith SemaRef.AddInitializerToDecl(Decl, Init, /*DirectInit=*/false, 1239ad762fcdc16b9e4705b12b09d92b8c026212b906Richard Smith /*TypeMayContainAuto=*/false); 1240ad762fcdc16b9e4705b12b09d92b8c026212b906Richard Smith SemaRef.FinalizeDeclaration(Decl); 1241b403d6d746239095a2c7bac958c924d92434e2b4Richard Smith SemaRef.CurContext->addHiddenDecl(Decl); 1242ad762fcdc16b9e4705b12b09d92b8c026212b906Richard Smith return false; 1243ad762fcdc16b9e4705b12b09d92b8c026212b906Richard Smith} 1244ad762fcdc16b9e4705b12b09d92b8c026212b906Richard Smith 1245ad762fcdc16b9e4705b12b09d92b8c026212b906Richard Smith/// Produce a note indicating which begin/end function was implicitly called 1246ad762fcdc16b9e4705b12b09d92b8c026212b906Richard Smith/// by a C++0x for-range statement. This is often not obvious from the code, 1247ad762fcdc16b9e4705b12b09d92b8c026212b906Richard Smith/// nor from the diagnostics produced when analysing the implicit expressions 1248ad762fcdc16b9e4705b12b09d92b8c026212b906Richard Smith/// required in a for-range statement. 1249ad762fcdc16b9e4705b12b09d92b8c026212b906Richard Smithvoid NoteForRangeBeginEndFunction(Sema &SemaRef, Expr *E, 1250ad762fcdc16b9e4705b12b09d92b8c026212b906Richard Smith BeginEndFunction BEF) { 1251ad762fcdc16b9e4705b12b09d92b8c026212b906Richard Smith CallExpr *CE = dyn_cast<CallExpr>(E); 1252ad762fcdc16b9e4705b12b09d92b8c026212b906Richard Smith if (!CE) 1253ad762fcdc16b9e4705b12b09d92b8c026212b906Richard Smith return; 1254ad762fcdc16b9e4705b12b09d92b8c026212b906Richard Smith FunctionDecl *D = dyn_cast<FunctionDecl>(CE->getCalleeDecl()); 1255ad762fcdc16b9e4705b12b09d92b8c026212b906Richard Smith if (!D) 1256ad762fcdc16b9e4705b12b09d92b8c026212b906Richard Smith return; 1257ad762fcdc16b9e4705b12b09d92b8c026212b906Richard Smith SourceLocation Loc = D->getLocation(); 1258ad762fcdc16b9e4705b12b09d92b8c026212b906Richard Smith 1259ad762fcdc16b9e4705b12b09d92b8c026212b906Richard Smith std::string Description; 1260ad762fcdc16b9e4705b12b09d92b8c026212b906Richard Smith bool IsTemplate = false; 1261ad762fcdc16b9e4705b12b09d92b8c026212b906Richard Smith if (FunctionTemplateDecl *FunTmpl = D->getPrimaryTemplate()) { 1262ad762fcdc16b9e4705b12b09d92b8c026212b906Richard Smith Description = SemaRef.getTemplateArgumentBindingsText( 1263ad762fcdc16b9e4705b12b09d92b8c026212b906Richard Smith FunTmpl->getTemplateParameters(), *D->getTemplateSpecializationArgs()); 1264ad762fcdc16b9e4705b12b09d92b8c026212b906Richard Smith IsTemplate = true; 1265ad762fcdc16b9e4705b12b09d92b8c026212b906Richard Smith } 1266ad762fcdc16b9e4705b12b09d92b8c026212b906Richard Smith 1267ad762fcdc16b9e4705b12b09d92b8c026212b906Richard Smith SemaRef.Diag(Loc, diag::note_for_range_begin_end) 1268ad762fcdc16b9e4705b12b09d92b8c026212b906Richard Smith << BEF << IsTemplate << Description << E->getType(); 1269ad762fcdc16b9e4705b12b09d92b8c026212b906Richard Smith} 1270ad762fcdc16b9e4705b12b09d92b8c026212b906Richard Smith 1271ad762fcdc16b9e4705b12b09d92b8c026212b906Richard Smith/// Build a call to 'begin' or 'end' for a C++0x for-range statement. If the 1272ad762fcdc16b9e4705b12b09d92b8c026212b906Richard Smith/// given LookupResult is non-empty, it is assumed to describe a member which 1273ad762fcdc16b9e4705b12b09d92b8c026212b906Richard Smith/// will be invoked. Otherwise, the function will be found via argument 1274ad762fcdc16b9e4705b12b09d92b8c026212b906Richard Smith/// dependent lookup. 1275ad762fcdc16b9e4705b12b09d92b8c026212b906Richard Smithstatic ExprResult BuildForRangeBeginEndCall(Sema &SemaRef, Scope *S, 1276ad762fcdc16b9e4705b12b09d92b8c026212b906Richard Smith SourceLocation Loc, 1277ad762fcdc16b9e4705b12b09d92b8c026212b906Richard Smith VarDecl *Decl, 1278ad762fcdc16b9e4705b12b09d92b8c026212b906Richard Smith BeginEndFunction BEF, 1279ad762fcdc16b9e4705b12b09d92b8c026212b906Richard Smith const DeclarationNameInfo &NameInfo, 1280ad762fcdc16b9e4705b12b09d92b8c026212b906Richard Smith LookupResult &MemberLookup, 1281ad762fcdc16b9e4705b12b09d92b8c026212b906Richard Smith Expr *Range) { 1282ad762fcdc16b9e4705b12b09d92b8c026212b906Richard Smith ExprResult CallExpr; 1283ad762fcdc16b9e4705b12b09d92b8c026212b906Richard Smith if (!MemberLookup.empty()) { 1284ad762fcdc16b9e4705b12b09d92b8c026212b906Richard Smith ExprResult MemberRef = 1285ad762fcdc16b9e4705b12b09d92b8c026212b906Richard Smith SemaRef.BuildMemberReferenceExpr(Range, Range->getType(), Loc, 1286ad762fcdc16b9e4705b12b09d92b8c026212b906Richard Smith /*IsPtr=*/false, CXXScopeSpec(), 1287e4b92761b43ced611c417ae478568610f1ad7b1eAbramo Bagnara /*TemplateKWLoc=*/SourceLocation(), 1288e4b92761b43ced611c417ae478568610f1ad7b1eAbramo Bagnara /*FirstQualifierInScope=*/0, 1289e4b92761b43ced611c417ae478568610f1ad7b1eAbramo Bagnara MemberLookup, 1290ad762fcdc16b9e4705b12b09d92b8c026212b906Richard Smith /*TemplateArgs=*/0); 1291ad762fcdc16b9e4705b12b09d92b8c026212b906Richard Smith if (MemberRef.isInvalid()) 1292ad762fcdc16b9e4705b12b09d92b8c026212b906Richard Smith return ExprError(); 1293ad762fcdc16b9e4705b12b09d92b8c026212b906Richard Smith CallExpr = SemaRef.ActOnCallExpr(S, MemberRef.get(), Loc, MultiExprArg(), 1294ad762fcdc16b9e4705b12b09d92b8c026212b906Richard Smith Loc, 0); 1295ad762fcdc16b9e4705b12b09d92b8c026212b906Richard Smith if (CallExpr.isInvalid()) 1296ad762fcdc16b9e4705b12b09d92b8c026212b906Richard Smith return ExprError(); 1297ad762fcdc16b9e4705b12b09d92b8c026212b906Richard Smith } else { 1298ad762fcdc16b9e4705b12b09d92b8c026212b906Richard Smith UnresolvedSet<0> FoundNames; 1299ad762fcdc16b9e4705b12b09d92b8c026212b906Richard Smith // C++0x [stmt.ranged]p1: For the purposes of this name lookup, namespace 1300ad762fcdc16b9e4705b12b09d92b8c026212b906Richard Smith // std is an associated namespace. 1301ad762fcdc16b9e4705b12b09d92b8c026212b906Richard Smith UnresolvedLookupExpr *Fn = 1302ad762fcdc16b9e4705b12b09d92b8c026212b906Richard Smith UnresolvedLookupExpr::Create(SemaRef.Context, /*NamingClass=*/0, 1303ad762fcdc16b9e4705b12b09d92b8c026212b906Richard Smith NestedNameSpecifierLoc(), NameInfo, 1304ad762fcdc16b9e4705b12b09d92b8c026212b906Richard Smith /*NeedsADL=*/true, /*Overloaded=*/false, 1305ad762fcdc16b9e4705b12b09d92b8c026212b906Richard Smith FoundNames.begin(), FoundNames.end(), 1306ad762fcdc16b9e4705b12b09d92b8c026212b906Richard Smith /*LookInStdNamespace=*/true); 1307ad762fcdc16b9e4705b12b09d92b8c026212b906Richard Smith CallExpr = SemaRef.BuildOverloadedCallExpr(S, Fn, Fn, Loc, &Range, 1, Loc, 13083943b1c0215da2a4171dd6c696cb75d19e5a04a9Kaelyn Uhrain 0, /*AllowTypoCorrection=*/false); 1309ad762fcdc16b9e4705b12b09d92b8c026212b906Richard Smith if (CallExpr.isInvalid()) { 1310ad762fcdc16b9e4705b12b09d92b8c026212b906Richard Smith SemaRef.Diag(Range->getLocStart(), diag::note_for_range_type) 1311ad762fcdc16b9e4705b12b09d92b8c026212b906Richard Smith << Range->getType(); 1312ad762fcdc16b9e4705b12b09d92b8c026212b906Richard Smith return ExprError(); 1313ad762fcdc16b9e4705b12b09d92b8c026212b906Richard Smith } 1314ad762fcdc16b9e4705b12b09d92b8c026212b906Richard Smith } 1315ad762fcdc16b9e4705b12b09d92b8c026212b906Richard Smith if (FinishForRangeVarDecl(SemaRef, Decl, CallExpr.get(), Loc, 1316ad762fcdc16b9e4705b12b09d92b8c026212b906Richard Smith diag::err_for_range_iter_deduction_failure)) { 1317ad762fcdc16b9e4705b12b09d92b8c026212b906Richard Smith NoteForRangeBeginEndFunction(SemaRef, CallExpr.get(), BEF); 1318ad762fcdc16b9e4705b12b09d92b8c026212b906Richard Smith return ExprError(); 1319ad762fcdc16b9e4705b12b09d92b8c026212b906Richard Smith } 1320ad762fcdc16b9e4705b12b09d92b8c026212b906Richard Smith return CallExpr; 1321ad762fcdc16b9e4705b12b09d92b8c026212b906Richard Smith} 1322ad762fcdc16b9e4705b12b09d92b8c026212b906Richard Smith 1323ad762fcdc16b9e4705b12b09d92b8c026212b906Richard Smith} 1324ad762fcdc16b9e4705b12b09d92b8c026212b906Richard Smith 1325ad762fcdc16b9e4705b12b09d92b8c026212b906Richard Smith/// ActOnCXXForRangeStmt - Check and build a C++0x for-range statement. 1326ad762fcdc16b9e4705b12b09d92b8c026212b906Richard Smith/// 1327ad762fcdc16b9e4705b12b09d92b8c026212b906Richard Smith/// C++0x [stmt.ranged]: 1328ad762fcdc16b9e4705b12b09d92b8c026212b906Richard Smith/// A range-based for statement is equivalent to 1329ad762fcdc16b9e4705b12b09d92b8c026212b906Richard Smith/// 1330ad762fcdc16b9e4705b12b09d92b8c026212b906Richard Smith/// { 1331ad762fcdc16b9e4705b12b09d92b8c026212b906Richard Smith/// auto && __range = range-init; 1332ad762fcdc16b9e4705b12b09d92b8c026212b906Richard Smith/// for ( auto __begin = begin-expr, 1333ad762fcdc16b9e4705b12b09d92b8c026212b906Richard Smith/// __end = end-expr; 1334ad762fcdc16b9e4705b12b09d92b8c026212b906Richard Smith/// __begin != __end; 1335ad762fcdc16b9e4705b12b09d92b8c026212b906Richard Smith/// ++__begin ) { 1336ad762fcdc16b9e4705b12b09d92b8c026212b906Richard Smith/// for-range-declaration = *__begin; 1337ad762fcdc16b9e4705b12b09d92b8c026212b906Richard Smith/// statement 1338ad762fcdc16b9e4705b12b09d92b8c026212b906Richard Smith/// } 1339ad762fcdc16b9e4705b12b09d92b8c026212b906Richard Smith/// } 1340ad762fcdc16b9e4705b12b09d92b8c026212b906Richard Smith/// 1341ad762fcdc16b9e4705b12b09d92b8c026212b906Richard Smith/// The body of the loop is not available yet, since it cannot be analysed until 1342ad762fcdc16b9e4705b12b09d92b8c026212b906Richard Smith/// we have determined the type of the for-range-declaration. 1343ad762fcdc16b9e4705b12b09d92b8c026212b906Richard SmithStmtResult 1344ad762fcdc16b9e4705b12b09d92b8c026212b906Richard SmithSema::ActOnCXXForRangeStmt(SourceLocation ForLoc, SourceLocation LParenLoc, 1345ad762fcdc16b9e4705b12b09d92b8c026212b906Richard Smith Stmt *First, SourceLocation ColonLoc, Expr *Range, 1346ad762fcdc16b9e4705b12b09d92b8c026212b906Richard Smith SourceLocation RParenLoc) { 1347ad762fcdc16b9e4705b12b09d92b8c026212b906Richard Smith if (!First || !Range) 1348ad762fcdc16b9e4705b12b09d92b8c026212b906Richard Smith return StmtError(); 1349ad762fcdc16b9e4705b12b09d92b8c026212b906Richard Smith 1350ad762fcdc16b9e4705b12b09d92b8c026212b906Richard Smith DeclStmt *DS = dyn_cast<DeclStmt>(First); 1351ad762fcdc16b9e4705b12b09d92b8c026212b906Richard Smith assert(DS && "first part of for range not a decl stmt"); 1352ad762fcdc16b9e4705b12b09d92b8c026212b906Richard Smith 1353ad762fcdc16b9e4705b12b09d92b8c026212b906Richard Smith if (!DS->isSingleDecl()) { 1354ad762fcdc16b9e4705b12b09d92b8c026212b906Richard Smith Diag(DS->getStartLoc(), diag::err_type_defined_in_for_range); 1355ad762fcdc16b9e4705b12b09d92b8c026212b906Richard Smith return StmtError(); 1356ad762fcdc16b9e4705b12b09d92b8c026212b906Richard Smith } 1357ad762fcdc16b9e4705b12b09d92b8c026212b906Richard Smith if (DS->getSingleDecl()->isInvalidDecl()) 1358ad762fcdc16b9e4705b12b09d92b8c026212b906Richard Smith return StmtError(); 1359ad762fcdc16b9e4705b12b09d92b8c026212b906Richard Smith 1360ad762fcdc16b9e4705b12b09d92b8c026212b906Richard Smith if (DiagnoseUnexpandedParameterPack(Range, UPPC_Expression)) 1361ad762fcdc16b9e4705b12b09d92b8c026212b906Richard Smith return StmtError(); 1362ad762fcdc16b9e4705b12b09d92b8c026212b906Richard Smith 1363ad762fcdc16b9e4705b12b09d92b8c026212b906Richard Smith // Build auto && __range = range-init 1364ad762fcdc16b9e4705b12b09d92b8c026212b906Richard Smith SourceLocation RangeLoc = Range->getLocStart(); 1365ad762fcdc16b9e4705b12b09d92b8c026212b906Richard Smith VarDecl *RangeVar = BuildForRangeVarDecl(*this, RangeLoc, 1366ad762fcdc16b9e4705b12b09d92b8c026212b906Richard Smith Context.getAutoRRefDeductType(), 1367ad762fcdc16b9e4705b12b09d92b8c026212b906Richard Smith "__range"); 1368ad762fcdc16b9e4705b12b09d92b8c026212b906Richard Smith if (FinishForRangeVarDecl(*this, RangeVar, Range, RangeLoc, 1369ad762fcdc16b9e4705b12b09d92b8c026212b906Richard Smith diag::err_for_range_deduction_failure)) 1370ad762fcdc16b9e4705b12b09d92b8c026212b906Richard Smith return StmtError(); 1371ad762fcdc16b9e4705b12b09d92b8c026212b906Richard Smith 1372ad762fcdc16b9e4705b12b09d92b8c026212b906Richard Smith // Claim the type doesn't contain auto: we've already done the checking. 1373ad762fcdc16b9e4705b12b09d92b8c026212b906Richard Smith DeclGroupPtrTy RangeGroup = 1374ad762fcdc16b9e4705b12b09d92b8c026212b906Richard Smith BuildDeclaratorGroup((Decl**)&RangeVar, 1, /*TypeMayContainAuto=*/false); 1375ad762fcdc16b9e4705b12b09d92b8c026212b906Richard Smith StmtResult RangeDecl = ActOnDeclStmt(RangeGroup, RangeLoc, RangeLoc); 1376ad762fcdc16b9e4705b12b09d92b8c026212b906Richard Smith if (RangeDecl.isInvalid()) 1377ad762fcdc16b9e4705b12b09d92b8c026212b906Richard Smith return StmtError(); 1378ad762fcdc16b9e4705b12b09d92b8c026212b906Richard Smith 1379ad762fcdc16b9e4705b12b09d92b8c026212b906Richard Smith return BuildCXXForRangeStmt(ForLoc, ColonLoc, RangeDecl.get(), 1380ad762fcdc16b9e4705b12b09d92b8c026212b906Richard Smith /*BeginEndDecl=*/0, /*Cond=*/0, /*Inc=*/0, DS, 1381ad762fcdc16b9e4705b12b09d92b8c026212b906Richard Smith RParenLoc); 1382ad762fcdc16b9e4705b12b09d92b8c026212b906Richard Smith} 1383ad762fcdc16b9e4705b12b09d92b8c026212b906Richard Smith 1384ad762fcdc16b9e4705b12b09d92b8c026212b906Richard Smith/// BuildCXXForRangeStmt - Build or instantiate a C++0x for-range statement. 1385ad762fcdc16b9e4705b12b09d92b8c026212b906Richard SmithStmtResult 1386ad762fcdc16b9e4705b12b09d92b8c026212b906Richard SmithSema::BuildCXXForRangeStmt(SourceLocation ForLoc, SourceLocation ColonLoc, 1387ad762fcdc16b9e4705b12b09d92b8c026212b906Richard Smith Stmt *RangeDecl, Stmt *BeginEnd, Expr *Cond, 1388ad762fcdc16b9e4705b12b09d92b8c026212b906Richard Smith Expr *Inc, Stmt *LoopVarDecl, 1389ad762fcdc16b9e4705b12b09d92b8c026212b906Richard Smith SourceLocation RParenLoc) { 1390ad762fcdc16b9e4705b12b09d92b8c026212b906Richard Smith Scope *S = getCurScope(); 1391ad762fcdc16b9e4705b12b09d92b8c026212b906Richard Smith 1392ad762fcdc16b9e4705b12b09d92b8c026212b906Richard Smith DeclStmt *RangeDS = cast<DeclStmt>(RangeDecl); 1393ad762fcdc16b9e4705b12b09d92b8c026212b906Richard Smith VarDecl *RangeVar = cast<VarDecl>(RangeDS->getSingleDecl()); 1394ad762fcdc16b9e4705b12b09d92b8c026212b906Richard Smith QualType RangeVarType = RangeVar->getType(); 1395ad762fcdc16b9e4705b12b09d92b8c026212b906Richard Smith 1396ad762fcdc16b9e4705b12b09d92b8c026212b906Richard Smith DeclStmt *LoopVarDS = cast<DeclStmt>(LoopVarDecl); 1397ad762fcdc16b9e4705b12b09d92b8c026212b906Richard Smith VarDecl *LoopVar = cast<VarDecl>(LoopVarDS->getSingleDecl()); 1398ad762fcdc16b9e4705b12b09d92b8c026212b906Richard Smith 1399ad762fcdc16b9e4705b12b09d92b8c026212b906Richard Smith StmtResult BeginEndDecl = BeginEnd; 1400ad762fcdc16b9e4705b12b09d92b8c026212b906Richard Smith ExprResult NotEqExpr = Cond, IncrExpr = Inc; 1401ad762fcdc16b9e4705b12b09d92b8c026212b906Richard Smith 1402ad762fcdc16b9e4705b12b09d92b8c026212b906Richard Smith if (!BeginEndDecl.get() && !RangeVarType->isDependentType()) { 1403ad762fcdc16b9e4705b12b09d92b8c026212b906Richard Smith SourceLocation RangeLoc = RangeVar->getLocation(); 1404ad762fcdc16b9e4705b12b09d92b8c026212b906Richard Smith 1405e50b01531afcb4afc40d27720afa09613ddcdfa2Ted Kremenek const QualType RangeVarNonRefType = RangeVarType.getNonReferenceType(); 1406e50b01531afcb4afc40d27720afa09613ddcdfa2Ted Kremenek 1407e50b01531afcb4afc40d27720afa09613ddcdfa2Ted Kremenek ExprResult BeginRangeRef = BuildDeclRefExpr(RangeVar, RangeVarNonRefType, 1408e50b01531afcb4afc40d27720afa09613ddcdfa2Ted Kremenek VK_LValue, ColonLoc); 1409e50b01531afcb4afc40d27720afa09613ddcdfa2Ted Kremenek if (BeginRangeRef.isInvalid()) 1410e50b01531afcb4afc40d27720afa09613ddcdfa2Ted Kremenek return StmtError(); 1411e50b01531afcb4afc40d27720afa09613ddcdfa2Ted Kremenek 1412e50b01531afcb4afc40d27720afa09613ddcdfa2Ted Kremenek ExprResult EndRangeRef = BuildDeclRefExpr(RangeVar, RangeVarNonRefType, 1413e50b01531afcb4afc40d27720afa09613ddcdfa2Ted Kremenek VK_LValue, ColonLoc); 1414e50b01531afcb4afc40d27720afa09613ddcdfa2Ted Kremenek if (EndRangeRef.isInvalid()) 1415ad762fcdc16b9e4705b12b09d92b8c026212b906Richard Smith return StmtError(); 1416ad762fcdc16b9e4705b12b09d92b8c026212b906Richard Smith 1417ad762fcdc16b9e4705b12b09d92b8c026212b906Richard Smith QualType AutoType = Context.getAutoDeductType(); 1418ad762fcdc16b9e4705b12b09d92b8c026212b906Richard Smith Expr *Range = RangeVar->getInit(); 1419ad762fcdc16b9e4705b12b09d92b8c026212b906Richard Smith if (!Range) 1420ad762fcdc16b9e4705b12b09d92b8c026212b906Richard Smith return StmtError(); 1421ad762fcdc16b9e4705b12b09d92b8c026212b906Richard Smith QualType RangeType = Range->getType(); 1422ad762fcdc16b9e4705b12b09d92b8c026212b906Richard Smith 1423ad762fcdc16b9e4705b12b09d92b8c026212b906Richard Smith if (RequireCompleteType(RangeLoc, RangeType, 1424ad762fcdc16b9e4705b12b09d92b8c026212b906Richard Smith PDiag(diag::err_for_range_incomplete_type))) 1425ad762fcdc16b9e4705b12b09d92b8c026212b906Richard Smith return StmtError(); 1426ad762fcdc16b9e4705b12b09d92b8c026212b906Richard Smith 1427ad762fcdc16b9e4705b12b09d92b8c026212b906Richard Smith // Build auto __begin = begin-expr, __end = end-expr. 1428ad762fcdc16b9e4705b12b09d92b8c026212b906Richard Smith VarDecl *BeginVar = BuildForRangeVarDecl(*this, ColonLoc, AutoType, 1429ad762fcdc16b9e4705b12b09d92b8c026212b906Richard Smith "__begin"); 1430ad762fcdc16b9e4705b12b09d92b8c026212b906Richard Smith VarDecl *EndVar = BuildForRangeVarDecl(*this, ColonLoc, AutoType, 1431ad762fcdc16b9e4705b12b09d92b8c026212b906Richard Smith "__end"); 1432ad762fcdc16b9e4705b12b09d92b8c026212b906Richard Smith 1433ad762fcdc16b9e4705b12b09d92b8c026212b906Richard Smith // Build begin-expr and end-expr and attach to __begin and __end variables. 1434ad762fcdc16b9e4705b12b09d92b8c026212b906Richard Smith ExprResult BeginExpr, EndExpr; 1435ad762fcdc16b9e4705b12b09d92b8c026212b906Richard Smith if (const ArrayType *UnqAT = RangeType->getAsArrayTypeUnsafe()) { 1436ad762fcdc16b9e4705b12b09d92b8c026212b906Richard Smith // - if _RangeT is an array type, begin-expr and end-expr are __range and 1437ad762fcdc16b9e4705b12b09d92b8c026212b906Richard Smith // __range + __bound, respectively, where __bound is the array bound. If 1438ad762fcdc16b9e4705b12b09d92b8c026212b906Richard Smith // _RangeT is an array of unknown size or an array of incomplete type, 1439ad762fcdc16b9e4705b12b09d92b8c026212b906Richard Smith // the program is ill-formed; 1440ad762fcdc16b9e4705b12b09d92b8c026212b906Richard Smith 1441ad762fcdc16b9e4705b12b09d92b8c026212b906Richard Smith // begin-expr is __range. 1442e50b01531afcb4afc40d27720afa09613ddcdfa2Ted Kremenek BeginExpr = BeginRangeRef; 1443e50b01531afcb4afc40d27720afa09613ddcdfa2Ted Kremenek if (FinishForRangeVarDecl(*this, BeginVar, BeginRangeRef.get(), ColonLoc, 1444ad762fcdc16b9e4705b12b09d92b8c026212b906Richard Smith diag::err_for_range_iter_deduction_failure)) { 1445ad762fcdc16b9e4705b12b09d92b8c026212b906Richard Smith NoteForRangeBeginEndFunction(*this, BeginExpr.get(), BEF_begin); 1446ad762fcdc16b9e4705b12b09d92b8c026212b906Richard Smith return StmtError(); 1447ad762fcdc16b9e4705b12b09d92b8c026212b906Richard Smith } 1448ad762fcdc16b9e4705b12b09d92b8c026212b906Richard Smith 1449ad762fcdc16b9e4705b12b09d92b8c026212b906Richard Smith // Find the array bound. 1450ad762fcdc16b9e4705b12b09d92b8c026212b906Richard Smith ExprResult BoundExpr; 1451ad762fcdc16b9e4705b12b09d92b8c026212b906Richard Smith if (const ConstantArrayType *CAT = dyn_cast<ConstantArrayType>(UnqAT)) 1452ad762fcdc16b9e4705b12b09d92b8c026212b906Richard Smith BoundExpr = Owned(IntegerLiteral::Create(Context, CAT->getSize(), 14531dd986dff9ddfbec687975700770bb377988e9edRichard Trieu Context.getPointerDiffType(), 14541dd986dff9ddfbec687975700770bb377988e9edRichard Trieu RangeLoc)); 1455ad762fcdc16b9e4705b12b09d92b8c026212b906Richard Smith else if (const VariableArrayType *VAT = 1456ad762fcdc16b9e4705b12b09d92b8c026212b906Richard Smith dyn_cast<VariableArrayType>(UnqAT)) 1457ad762fcdc16b9e4705b12b09d92b8c026212b906Richard Smith BoundExpr = VAT->getSizeExpr(); 1458ad762fcdc16b9e4705b12b09d92b8c026212b906Richard Smith else { 1459ad762fcdc16b9e4705b12b09d92b8c026212b906Richard Smith // Can't be a DependentSizedArrayType or an IncompleteArrayType since 1460ad762fcdc16b9e4705b12b09d92b8c026212b906Richard Smith // UnqAT is not incomplete and Range is not type-dependent. 1461b219cfc4d75f0a03630b7c4509ef791b7e97b2c8David Blaikie llvm_unreachable("Unexpected array type in for-range"); 1462ad762fcdc16b9e4705b12b09d92b8c026212b906Richard Smith } 1463ad762fcdc16b9e4705b12b09d92b8c026212b906Richard Smith 1464ad762fcdc16b9e4705b12b09d92b8c026212b906Richard Smith // end-expr is __range + __bound. 1465e50b01531afcb4afc40d27720afa09613ddcdfa2Ted Kremenek EndExpr = ActOnBinOp(S, ColonLoc, tok::plus, EndRangeRef.get(), 1466ad762fcdc16b9e4705b12b09d92b8c026212b906Richard Smith BoundExpr.get()); 1467ad762fcdc16b9e4705b12b09d92b8c026212b906Richard Smith if (EndExpr.isInvalid()) 1468ad762fcdc16b9e4705b12b09d92b8c026212b906Richard Smith return StmtError(); 1469ad762fcdc16b9e4705b12b09d92b8c026212b906Richard Smith if (FinishForRangeVarDecl(*this, EndVar, EndExpr.get(), ColonLoc, 1470ad762fcdc16b9e4705b12b09d92b8c026212b906Richard Smith diag::err_for_range_iter_deduction_failure)) { 1471ad762fcdc16b9e4705b12b09d92b8c026212b906Richard Smith NoteForRangeBeginEndFunction(*this, EndExpr.get(), BEF_end); 1472ad762fcdc16b9e4705b12b09d92b8c026212b906Richard Smith return StmtError(); 1473ad762fcdc16b9e4705b12b09d92b8c026212b906Richard Smith } 1474ad762fcdc16b9e4705b12b09d92b8c026212b906Richard Smith } else { 1475ad762fcdc16b9e4705b12b09d92b8c026212b906Richard Smith DeclarationNameInfo BeginNameInfo(&PP.getIdentifierTable().get("begin"), 1476ad762fcdc16b9e4705b12b09d92b8c026212b906Richard Smith ColonLoc); 1477ad762fcdc16b9e4705b12b09d92b8c026212b906Richard Smith DeclarationNameInfo EndNameInfo(&PP.getIdentifierTable().get("end"), 1478ad762fcdc16b9e4705b12b09d92b8c026212b906Richard Smith ColonLoc); 1479ad762fcdc16b9e4705b12b09d92b8c026212b906Richard Smith 1480ad762fcdc16b9e4705b12b09d92b8c026212b906Richard Smith LookupResult BeginMemberLookup(*this, BeginNameInfo, LookupMemberName); 1481ad762fcdc16b9e4705b12b09d92b8c026212b906Richard Smith LookupResult EndMemberLookup(*this, EndNameInfo, LookupMemberName); 1482ad762fcdc16b9e4705b12b09d92b8c026212b906Richard Smith 1483ad762fcdc16b9e4705b12b09d92b8c026212b906Richard Smith if (CXXRecordDecl *D = RangeType->getAsCXXRecordDecl()) { 1484ad762fcdc16b9e4705b12b09d92b8c026212b906Richard Smith // - if _RangeT is a class type, the unqualified-ids begin and end are 1485ad762fcdc16b9e4705b12b09d92b8c026212b906Richard Smith // looked up in the scope of class _RangeT as if by class member access 1486ad762fcdc16b9e4705b12b09d92b8c026212b906Richard Smith // lookup (3.4.5), and if either (or both) finds at least one 1487ad762fcdc16b9e4705b12b09d92b8c026212b906Richard Smith // declaration, begin-expr and end-expr are __range.begin() and 1488ad762fcdc16b9e4705b12b09d92b8c026212b906Richard Smith // __range.end(), respectively; 1489ad762fcdc16b9e4705b12b09d92b8c026212b906Richard Smith LookupQualifiedName(BeginMemberLookup, D); 1490ad762fcdc16b9e4705b12b09d92b8c026212b906Richard Smith LookupQualifiedName(EndMemberLookup, D); 1491ad762fcdc16b9e4705b12b09d92b8c026212b906Richard Smith 1492ad762fcdc16b9e4705b12b09d92b8c026212b906Richard Smith if (BeginMemberLookup.empty() != EndMemberLookup.empty()) { 1493ad762fcdc16b9e4705b12b09d92b8c026212b906Richard Smith Diag(ColonLoc, diag::err_for_range_member_begin_end_mismatch) 1494ad762fcdc16b9e4705b12b09d92b8c026212b906Richard Smith << RangeType << BeginMemberLookup.empty(); 1495ad762fcdc16b9e4705b12b09d92b8c026212b906Richard Smith return StmtError(); 1496ad762fcdc16b9e4705b12b09d92b8c026212b906Richard Smith } 1497ad762fcdc16b9e4705b12b09d92b8c026212b906Richard Smith } else { 1498ad762fcdc16b9e4705b12b09d92b8c026212b906Richard Smith // - otherwise, begin-expr and end-expr are begin(__range) and 1499ad762fcdc16b9e4705b12b09d92b8c026212b906Richard Smith // end(__range), respectively, where begin and end are looked up with 1500ad762fcdc16b9e4705b12b09d92b8c026212b906Richard Smith // argument-dependent lookup (3.4.2). For the purposes of this name 1501ad762fcdc16b9e4705b12b09d92b8c026212b906Richard Smith // lookup, namespace std is an associated namespace. 1502ad762fcdc16b9e4705b12b09d92b8c026212b906Richard Smith } 1503ad762fcdc16b9e4705b12b09d92b8c026212b906Richard Smith 1504ad762fcdc16b9e4705b12b09d92b8c026212b906Richard Smith BeginExpr = BuildForRangeBeginEndCall(*this, S, ColonLoc, BeginVar, 1505ad762fcdc16b9e4705b12b09d92b8c026212b906Richard Smith BEF_begin, BeginNameInfo, 1506e50b01531afcb4afc40d27720afa09613ddcdfa2Ted Kremenek BeginMemberLookup, 1507e50b01531afcb4afc40d27720afa09613ddcdfa2Ted Kremenek BeginRangeRef.get()); 1508ad762fcdc16b9e4705b12b09d92b8c026212b906Richard Smith if (BeginExpr.isInvalid()) 1509ad762fcdc16b9e4705b12b09d92b8c026212b906Richard Smith return StmtError(); 1510ad762fcdc16b9e4705b12b09d92b8c026212b906Richard Smith 1511ad762fcdc16b9e4705b12b09d92b8c026212b906Richard Smith EndExpr = BuildForRangeBeginEndCall(*this, S, ColonLoc, EndVar, 1512ad762fcdc16b9e4705b12b09d92b8c026212b906Richard Smith BEF_end, EndNameInfo, 1513e50b01531afcb4afc40d27720afa09613ddcdfa2Ted Kremenek EndMemberLookup, EndRangeRef.get()); 1514ad762fcdc16b9e4705b12b09d92b8c026212b906Richard Smith if (EndExpr.isInvalid()) 1515ad762fcdc16b9e4705b12b09d92b8c026212b906Richard Smith return StmtError(); 1516ad762fcdc16b9e4705b12b09d92b8c026212b906Richard Smith } 1517ad762fcdc16b9e4705b12b09d92b8c026212b906Richard Smith 1518ad762fcdc16b9e4705b12b09d92b8c026212b906Richard Smith // C++0x [decl.spec.auto]p6: BeginType and EndType must be the same. 1519ad762fcdc16b9e4705b12b09d92b8c026212b906Richard Smith QualType BeginType = BeginVar->getType(), EndType = EndVar->getType(); 1520ad762fcdc16b9e4705b12b09d92b8c026212b906Richard Smith if (!Context.hasSameType(BeginType, EndType)) { 1521ad762fcdc16b9e4705b12b09d92b8c026212b906Richard Smith Diag(RangeLoc, diag::err_for_range_begin_end_types_differ) 1522ad762fcdc16b9e4705b12b09d92b8c026212b906Richard Smith << BeginType << EndType; 1523ad762fcdc16b9e4705b12b09d92b8c026212b906Richard Smith NoteForRangeBeginEndFunction(*this, BeginExpr.get(), BEF_begin); 1524ad762fcdc16b9e4705b12b09d92b8c026212b906Richard Smith NoteForRangeBeginEndFunction(*this, EndExpr.get(), BEF_end); 1525ad762fcdc16b9e4705b12b09d92b8c026212b906Richard Smith } 1526ad762fcdc16b9e4705b12b09d92b8c026212b906Richard Smith 1527ad762fcdc16b9e4705b12b09d92b8c026212b906Richard Smith Decl *BeginEndDecls[] = { BeginVar, EndVar }; 1528ad762fcdc16b9e4705b12b09d92b8c026212b906Richard Smith // Claim the type doesn't contain auto: we've already done the checking. 1529ad762fcdc16b9e4705b12b09d92b8c026212b906Richard Smith DeclGroupPtrTy BeginEndGroup = 1530ad762fcdc16b9e4705b12b09d92b8c026212b906Richard Smith BuildDeclaratorGroup(BeginEndDecls, 2, /*TypeMayContainAuto=*/false); 1531ad762fcdc16b9e4705b12b09d92b8c026212b906Richard Smith BeginEndDecl = ActOnDeclStmt(BeginEndGroup, ColonLoc, ColonLoc); 1532ad762fcdc16b9e4705b12b09d92b8c026212b906Richard Smith 1533e50b01531afcb4afc40d27720afa09613ddcdfa2Ted Kremenek const QualType BeginRefNonRefType = BeginType.getNonReferenceType(); 1534e50b01531afcb4afc40d27720afa09613ddcdfa2Ted Kremenek ExprResult BeginRef = BuildDeclRefExpr(BeginVar, BeginRefNonRefType, 1535ad762fcdc16b9e4705b12b09d92b8c026212b906Richard Smith VK_LValue, ColonLoc); 1536e50b01531afcb4afc40d27720afa09613ddcdfa2Ted Kremenek if (BeginRef.isInvalid()) 1537e50b01531afcb4afc40d27720afa09613ddcdfa2Ted Kremenek return StmtError(); 1538e50b01531afcb4afc40d27720afa09613ddcdfa2Ted Kremenek 1539ad762fcdc16b9e4705b12b09d92b8c026212b906Richard Smith ExprResult EndRef = BuildDeclRefExpr(EndVar, EndType.getNonReferenceType(), 1540ad762fcdc16b9e4705b12b09d92b8c026212b906Richard Smith VK_LValue, ColonLoc); 1541e50b01531afcb4afc40d27720afa09613ddcdfa2Ted Kremenek if (EndRef.isInvalid()) 1542e50b01531afcb4afc40d27720afa09613ddcdfa2Ted Kremenek return StmtError(); 1543ad762fcdc16b9e4705b12b09d92b8c026212b906Richard Smith 1544ad762fcdc16b9e4705b12b09d92b8c026212b906Richard Smith // Build and check __begin != __end expression. 1545ad762fcdc16b9e4705b12b09d92b8c026212b906Richard Smith NotEqExpr = ActOnBinOp(S, ColonLoc, tok::exclaimequal, 1546ad762fcdc16b9e4705b12b09d92b8c026212b906Richard Smith BeginRef.get(), EndRef.get()); 1547ad762fcdc16b9e4705b12b09d92b8c026212b906Richard Smith NotEqExpr = ActOnBooleanCondition(S, ColonLoc, NotEqExpr.get()); 1548ad762fcdc16b9e4705b12b09d92b8c026212b906Richard Smith NotEqExpr = ActOnFinishFullExpr(NotEqExpr.get()); 1549ad762fcdc16b9e4705b12b09d92b8c026212b906Richard Smith if (NotEqExpr.isInvalid()) { 1550ad762fcdc16b9e4705b12b09d92b8c026212b906Richard Smith NoteForRangeBeginEndFunction(*this, BeginExpr.get(), BEF_begin); 1551ad762fcdc16b9e4705b12b09d92b8c026212b906Richard Smith if (!Context.hasSameType(BeginType, EndType)) 1552ad762fcdc16b9e4705b12b09d92b8c026212b906Richard Smith NoteForRangeBeginEndFunction(*this, EndExpr.get(), BEF_end); 1553ad762fcdc16b9e4705b12b09d92b8c026212b906Richard Smith return StmtError(); 1554ad762fcdc16b9e4705b12b09d92b8c026212b906Richard Smith } 1555ad762fcdc16b9e4705b12b09d92b8c026212b906Richard Smith 1556ad762fcdc16b9e4705b12b09d92b8c026212b906Richard Smith // Build and check ++__begin expression. 1557e50b01531afcb4afc40d27720afa09613ddcdfa2Ted Kremenek BeginRef = BuildDeclRefExpr(BeginVar, BeginRefNonRefType, 1558e50b01531afcb4afc40d27720afa09613ddcdfa2Ted Kremenek VK_LValue, ColonLoc); 1559e50b01531afcb4afc40d27720afa09613ddcdfa2Ted Kremenek if (BeginRef.isInvalid()) 1560e50b01531afcb4afc40d27720afa09613ddcdfa2Ted Kremenek return StmtError(); 1561e50b01531afcb4afc40d27720afa09613ddcdfa2Ted Kremenek 1562ad762fcdc16b9e4705b12b09d92b8c026212b906Richard Smith IncrExpr = ActOnUnaryOp(S, ColonLoc, tok::plusplus, BeginRef.get()); 1563ad762fcdc16b9e4705b12b09d92b8c026212b906Richard Smith IncrExpr = ActOnFinishFullExpr(IncrExpr.get()); 1564ad762fcdc16b9e4705b12b09d92b8c026212b906Richard Smith if (IncrExpr.isInvalid()) { 1565ad762fcdc16b9e4705b12b09d92b8c026212b906Richard Smith NoteForRangeBeginEndFunction(*this, BeginExpr.get(), BEF_begin); 1566ad762fcdc16b9e4705b12b09d92b8c026212b906Richard Smith return StmtError(); 1567ad762fcdc16b9e4705b12b09d92b8c026212b906Richard Smith } 1568ad762fcdc16b9e4705b12b09d92b8c026212b906Richard Smith 1569ad762fcdc16b9e4705b12b09d92b8c026212b906Richard Smith // Build and check *__begin expression. 1570e50b01531afcb4afc40d27720afa09613ddcdfa2Ted Kremenek BeginRef = BuildDeclRefExpr(BeginVar, BeginRefNonRefType, 1571e50b01531afcb4afc40d27720afa09613ddcdfa2Ted Kremenek VK_LValue, ColonLoc); 1572e50b01531afcb4afc40d27720afa09613ddcdfa2Ted Kremenek if (BeginRef.isInvalid()) 1573e50b01531afcb4afc40d27720afa09613ddcdfa2Ted Kremenek return StmtError(); 1574e50b01531afcb4afc40d27720afa09613ddcdfa2Ted Kremenek 1575ad762fcdc16b9e4705b12b09d92b8c026212b906Richard Smith ExprResult DerefExpr = ActOnUnaryOp(S, ColonLoc, tok::star, BeginRef.get()); 1576ad762fcdc16b9e4705b12b09d92b8c026212b906Richard Smith if (DerefExpr.isInvalid()) { 1577ad762fcdc16b9e4705b12b09d92b8c026212b906Richard Smith NoteForRangeBeginEndFunction(*this, BeginExpr.get(), BEF_begin); 1578ad762fcdc16b9e4705b12b09d92b8c026212b906Richard Smith return StmtError(); 1579ad762fcdc16b9e4705b12b09d92b8c026212b906Richard Smith } 1580ad762fcdc16b9e4705b12b09d92b8c026212b906Richard Smith 1581ad762fcdc16b9e4705b12b09d92b8c026212b906Richard Smith // Attach *__begin as initializer for VD. 1582ad762fcdc16b9e4705b12b09d92b8c026212b906Richard Smith if (!LoopVar->isInvalidDecl()) { 1583ad762fcdc16b9e4705b12b09d92b8c026212b906Richard Smith AddInitializerToDecl(LoopVar, DerefExpr.get(), /*DirectInit=*/false, 1584ad762fcdc16b9e4705b12b09d92b8c026212b906Richard Smith /*TypeMayContainAuto=*/true); 1585ad762fcdc16b9e4705b12b09d92b8c026212b906Richard Smith if (LoopVar->isInvalidDecl()) 1586ad762fcdc16b9e4705b12b09d92b8c026212b906Richard Smith NoteForRangeBeginEndFunction(*this, BeginExpr.get(), BEF_begin); 1587ad762fcdc16b9e4705b12b09d92b8c026212b906Richard Smith } 1588cd6f36693ed40cef8c8639c04438d865187c1f73Richard Smith } else { 1589cd6f36693ed40cef8c8639c04438d865187c1f73Richard Smith // The range is implicitly used as a placeholder when it is dependent. 1590cd6f36693ed40cef8c8639c04438d865187c1f73Richard Smith RangeVar->setUsed(); 1591ad762fcdc16b9e4705b12b09d92b8c026212b906Richard Smith } 1592ad762fcdc16b9e4705b12b09d92b8c026212b906Richard Smith 1593ad762fcdc16b9e4705b12b09d92b8c026212b906Richard Smith return Owned(new (Context) CXXForRangeStmt(RangeDS, 1594ad762fcdc16b9e4705b12b09d92b8c026212b906Richard Smith cast_or_null<DeclStmt>(BeginEndDecl.get()), 1595ad762fcdc16b9e4705b12b09d92b8c026212b906Richard Smith NotEqExpr.take(), IncrExpr.take(), 1596ad762fcdc16b9e4705b12b09d92b8c026212b906Richard Smith LoopVarDS, /*Body=*/0, ForLoc, 1597ad762fcdc16b9e4705b12b09d92b8c026212b906Richard Smith ColonLoc, RParenLoc)); 1598ad762fcdc16b9e4705b12b09d92b8c026212b906Richard Smith} 1599ad762fcdc16b9e4705b12b09d92b8c026212b906Richard Smith 1600ad762fcdc16b9e4705b12b09d92b8c026212b906Richard Smith/// FinishCXXForRangeStmt - Attach the body to a C++0x for-range statement. 1601ad762fcdc16b9e4705b12b09d92b8c026212b906Richard Smith/// This is a separate step from ActOnCXXForRangeStmt because analysis of the 1602ad762fcdc16b9e4705b12b09d92b8c026212b906Richard Smith/// body cannot be performed until after the type of the range variable is 1603ad762fcdc16b9e4705b12b09d92b8c026212b906Richard Smith/// determined. 1604ad762fcdc16b9e4705b12b09d92b8c026212b906Richard SmithStmtResult Sema::FinishCXXForRangeStmt(Stmt *S, Stmt *B) { 1605ad762fcdc16b9e4705b12b09d92b8c026212b906Richard Smith if (!S || !B) 1606ad762fcdc16b9e4705b12b09d92b8c026212b906Richard Smith return StmtError(); 1607ad762fcdc16b9e4705b12b09d92b8c026212b906Richard Smith 1608625bb569df0c34feec0d52c0ec5215f21ef2e054Dmitri Gribenko CXXForRangeStmt *ForStmt = cast<CXXForRangeStmt>(S); 1609625bb569df0c34feec0d52c0ec5215f21ef2e054Dmitri Gribenko ForStmt->setBody(B); 1610625bb569df0c34feec0d52c0ec5215f21ef2e054Dmitri Gribenko 1611625bb569df0c34feec0d52c0ec5215f21ef2e054Dmitri Gribenko DiagnoseEmptyStmtBody(ForStmt->getRParenLoc(), B, 1612625bb569df0c34feec0d52c0ec5215f21ef2e054Dmitri Gribenko diag::warn_empty_range_based_for_body); 1613625bb569df0c34feec0d52c0ec5215f21ef2e054Dmitri Gribenko 1614ad762fcdc16b9e4705b12b09d92b8c026212b906Richard Smith return S; 1615ad762fcdc16b9e4705b12b09d92b8c026212b906Richard Smith} 1616ad762fcdc16b9e4705b12b09d92b8c026212b906Richard Smith 161757ad37823e198f977cac605dbfbaefb4daf325e9Chris LattnerStmtResult Sema::ActOnGotoStmt(SourceLocation GotoLoc, 161857ad37823e198f977cac605dbfbaefb4daf325e9Chris Lattner SourceLocation LabelLoc, 161957ad37823e198f977cac605dbfbaefb4daf325e9Chris Lattner LabelDecl *TheDecl) { 162057ad37823e198f977cac605dbfbaefb4daf325e9Chris Lattner getCurFunction()->setHasBranchIntoScope(); 1621ad8dcf4a9df0e24051dc31bf9e6f3cd138a34298Chris Lattner TheDecl->setUsed(); 1622ad8dcf4a9df0e24051dc31bf9e6f3cd138a34298Chris Lattner return Owned(new (Context) GotoStmt(TheDecl, GotoLoc, LabelLoc)); 16235f016e2cb5d11daeb237544de1c5d59f20fe1a6eReid Spencer} 16245f016e2cb5d11daeb237544de1c5d59f20fe1a6eReid Spencer 162560d7b3a319d84d688752be3870615ac0f111fb16John McCallStmtResult 1626ad56d684259f706b7c0ae5ad9c23adb4f2926817Chris LattnerSema::ActOnIndirectGotoStmt(SourceLocation GotoLoc, SourceLocation StarLoc, 16279ae2f076ca5ab1feb3ba95629099ec2319833701John McCall Expr *E) { 1628bbf462314b1dc8e422b7c4dd4cac47e566aedf6dEli Friedman // Convert operand to void* 16295f1b9e689fa5c101512aef99225f2afea1673449Douglas Gregor if (!E->isTypeDependent()) { 16305f1b9e689fa5c101512aef99225f2afea1673449Douglas Gregor QualType ETy = E->getType(); 16312877998bd8db2fac1c56430a4edcfa0ce138aff9Chandler Carruth QualType DestTy = Context.getPointerType(Context.VoidTy.withConst()); 1632429bb276991ff2dbc7c5b438828b9b7737cb15ebJohn Wiegley ExprResult ExprRes = Owned(E); 16335f1b9e689fa5c101512aef99225f2afea1673449Douglas Gregor AssignConvertType ConvTy = 1634429bb276991ff2dbc7c5b438828b9b7737cb15ebJohn Wiegley CheckSingleAssignmentConstraints(DestTy, ExprRes); 1635429bb276991ff2dbc7c5b438828b9b7737cb15ebJohn Wiegley if (ExprRes.isInvalid()) 1636429bb276991ff2dbc7c5b438828b9b7737cb15ebJohn Wiegley return StmtError(); 1637429bb276991ff2dbc7c5b438828b9b7737cb15ebJohn Wiegley E = ExprRes.take(); 16382877998bd8db2fac1c56430a4edcfa0ce138aff9Chandler Carruth if (DiagnoseAssignmentResult(ConvTy, StarLoc, DestTy, ETy, E, AA_Passing)) 16395f1b9e689fa5c101512aef99225f2afea1673449Douglas Gregor return StmtError(); 1640d29975fd08713eb9d1777e60536addaa62df8995Eli Friedman E = MaybeCreateExprWithCleanups(E); 16415f1b9e689fa5c101512aef99225f2afea1673449Douglas Gregor } 1642b60a77e453d32db0ab1914d28e175c2defc0eb65John McCall 1643781472fe99a120098c631b0cbe33c89f8cef5e70John McCall getCurFunction()->setHasIndirectGoto(); 1644b60a77e453d32db0ab1914d28e175c2defc0eb65John McCall 16455f1b9e689fa5c101512aef99225f2afea1673449Douglas Gregor return Owned(new (Context) IndirectGotoStmt(GotoLoc, StarLoc, E)); 16465f016e2cb5d11daeb237544de1c5d59f20fe1a6eReid Spencer} 16475f016e2cb5d11daeb237544de1c5d59f20fe1a6eReid Spencer 164860d7b3a319d84d688752be3870615ac0f111fb16John McCallStmtResult 16491b273c403734d343d720acb28f04011807c8aa56Steve NaroffSema::ActOnContinueStmt(SourceLocation ContinueLoc, Scope *CurScope) { 16505f016e2cb5d11daeb237544de1c5d59f20fe1a6eReid Spencer Scope *S = CurScope->getContinueParent(); 16515f016e2cb5d11daeb237544de1c5d59f20fe1a6eReid Spencer if (!S) { 16525f016e2cb5d11daeb237544de1c5d59f20fe1a6eReid Spencer // C99 6.8.6.2p1: A break shall appear only in or as a loop body. 16534cffe2fd5c23168bc08f0453c684cbd3f79471d3Sebastian Redl return StmtError(Diag(ContinueLoc, diag::err_continue_not_in_loop)); 16545f016e2cb5d11daeb237544de1c5d59f20fe1a6eReid Spencer } 16554cffe2fd5c23168bc08f0453c684cbd3f79471d3Sebastian Redl 16568189cde56b4f6f938cd65f53c932fe1860d0204cTed Kremenek return Owned(new (Context) ContinueStmt(ContinueLoc)); 16575f016e2cb5d11daeb237544de1c5d59f20fe1a6eReid Spencer} 16585f016e2cb5d11daeb237544de1c5d59f20fe1a6eReid Spencer 165960d7b3a319d84d688752be3870615ac0f111fb16John McCallStmtResult 16601b273c403734d343d720acb28f04011807c8aa56Steve NaroffSema::ActOnBreakStmt(SourceLocation BreakLoc, Scope *CurScope) { 16615f016e2cb5d11daeb237544de1c5d59f20fe1a6eReid Spencer Scope *S = CurScope->getBreakParent(); 16625f016e2cb5d11daeb237544de1c5d59f20fe1a6eReid Spencer if (!S) { 16635f016e2cb5d11daeb237544de1c5d59f20fe1a6eReid Spencer // C99 6.8.6.3p1: A break shall appear only in or as a switch/loop body. 16644cffe2fd5c23168bc08f0453c684cbd3f79471d3Sebastian Redl return StmtError(Diag(BreakLoc, diag::err_break_not_in_loop_or_switch)); 16655f016e2cb5d11daeb237544de1c5d59f20fe1a6eReid Spencer } 16664cffe2fd5c23168bc08f0453c684cbd3f79471d3Sebastian Redl 16678189cde56b4f6f938cd65f53c932fe1860d0204cTed Kremenek return Owned(new (Context) BreakStmt(BreakLoc)); 16685f016e2cb5d11daeb237544de1c5d59f20fe1a6eReid Spencer} 16695f016e2cb5d11daeb237544de1c5d59f20fe1a6eReid Spencer 1670dfbb02a16ac8c764b5ba1742450513d6212d2f9fNAKAMURA Takumi/// \brief Determine whether the given expression is a candidate for 1671f5d8f466c3eebaffc51468812bdcbe7f0fe4891aDouglas Gregor/// copy elision in either a return statement or a throw expression. 16725077c3876beeaed32280af88244e8050078619a8Douglas Gregor/// 1673f5d8f466c3eebaffc51468812bdcbe7f0fe4891aDouglas Gregor/// \param ReturnType If we're determining the copy elision candidate for 1674f5d8f466c3eebaffc51468812bdcbe7f0fe4891aDouglas Gregor/// a return statement, this is the return type of the function. If we're 1675f5d8f466c3eebaffc51468812bdcbe7f0fe4891aDouglas Gregor/// determining the copy elision candidate for a throw expression, this will 1676f5d8f466c3eebaffc51468812bdcbe7f0fe4891aDouglas Gregor/// be a NULL type. 16775077c3876beeaed32280af88244e8050078619a8Douglas Gregor/// 1678f5d8f466c3eebaffc51468812bdcbe7f0fe4891aDouglas Gregor/// \param E The expression being returned from the function or block, or 1679f5d8f466c3eebaffc51468812bdcbe7f0fe4891aDouglas Gregor/// being thrown. 16805077c3876beeaed32280af88244e8050078619a8Douglas Gregor/// 16814926d832aa2f0af9d7c00633727d49e7967eb978Douglas Gregor/// \param AllowFunctionParameter Whether we allow function parameters to 16824926d832aa2f0af9d7c00633727d49e7967eb978Douglas Gregor/// be considered NRVO candidates. C++ prohibits this for NRVO itself, but 16834926d832aa2f0af9d7c00633727d49e7967eb978Douglas Gregor/// we re-use this logic to determine whether we should try to move as part of 16844926d832aa2f0af9d7c00633727d49e7967eb978Douglas Gregor/// a return or throw (which does allow function parameters). 16855077c3876beeaed32280af88244e8050078619a8Douglas Gregor/// 16865077c3876beeaed32280af88244e8050078619a8Douglas Gregor/// \returns The NRVO candidate variable, if the return statement may use the 16875077c3876beeaed32280af88244e8050078619a8Douglas Gregor/// NRVO, or NULL if there is no such candidate. 1688f5d8f466c3eebaffc51468812bdcbe7f0fe4891aDouglas Gregorconst VarDecl *Sema::getCopyElisionCandidate(QualType ReturnType, 1689f5d8f466c3eebaffc51468812bdcbe7f0fe4891aDouglas Gregor Expr *E, 1690f5d8f466c3eebaffc51468812bdcbe7f0fe4891aDouglas Gregor bool AllowFunctionParameter) { 1691f5d8f466c3eebaffc51468812bdcbe7f0fe4891aDouglas Gregor QualType ExprType = E->getType(); 16923c9034cb7ff1d6c1e4ecd1b44c98f553df013c7cDouglas Gregor // - in a return statement in a function with ... 16933c9034cb7ff1d6c1e4ecd1b44c98f553df013c7cDouglas Gregor // ... a class return type ... 1694f5d8f466c3eebaffc51468812bdcbe7f0fe4891aDouglas Gregor if (!ReturnType.isNull()) { 1695f5d8f466c3eebaffc51468812bdcbe7f0fe4891aDouglas Gregor if (!ReturnType->isRecordType()) 1696f5d8f466c3eebaffc51468812bdcbe7f0fe4891aDouglas Gregor return 0; 1697f5d8f466c3eebaffc51468812bdcbe7f0fe4891aDouglas Gregor // ... the same cv-unqualified type as the function return type ... 1698f5d8f466c3eebaffc51468812bdcbe7f0fe4891aDouglas Gregor if (!Context.hasSameUnqualifiedType(ReturnType, ExprType)) 1699f5d8f466c3eebaffc51468812bdcbe7f0fe4891aDouglas Gregor return 0; 1700f5d8f466c3eebaffc51468812bdcbe7f0fe4891aDouglas Gregor } 1701dfbb02a16ac8c764b5ba1742450513d6212d2f9fNAKAMURA Takumi 1702dfbb02a16ac8c764b5ba1742450513d6212d2f9fNAKAMURA Takumi // ... the expression is the name of a non-volatile automatic object 1703f5d8f466c3eebaffc51468812bdcbe7f0fe4891aDouglas Gregor // (other than a function or catch-clause parameter)) ... 1704f5d8f466c3eebaffc51468812bdcbe7f0fe4891aDouglas Gregor const DeclRefExpr *DR = dyn_cast<DeclRefExpr>(E->IgnoreParens()); 17053c9034cb7ff1d6c1e4ecd1b44c98f553df013c7cDouglas Gregor if (!DR) 17065077c3876beeaed32280af88244e8050078619a8Douglas Gregor return 0; 17073c9034cb7ff1d6c1e4ecd1b44c98f553df013c7cDouglas Gregor const VarDecl *VD = dyn_cast<VarDecl>(DR->getDecl()); 17083c9034cb7ff1d6c1e4ecd1b44c98f553df013c7cDouglas Gregor if (!VD) 17095077c3876beeaed32280af88244e8050078619a8Douglas Gregor return 0; 1710dfbb02a16ac8c764b5ba1742450513d6212d2f9fNAKAMURA Takumi 17111cd76e8ca8f890a4defadcae3372c025ebe7607cJohn McCall // ...object (other than a function or catch-clause parameter)... 17121cd76e8ca8f890a4defadcae3372c025ebe7607cJohn McCall if (VD->getKind() != Decl::Var && 17131cd76e8ca8f890a4defadcae3372c025ebe7607cJohn McCall !(AllowFunctionParameter && VD->getKind() == Decl::ParmVar)) 17141cd76e8ca8f890a4defadcae3372c025ebe7607cJohn McCall return 0; 17151cd76e8ca8f890a4defadcae3372c025ebe7607cJohn McCall if (VD->isExceptionVariable()) return 0; 17161cd76e8ca8f890a4defadcae3372c025ebe7607cJohn McCall 17171cd76e8ca8f890a4defadcae3372c025ebe7607cJohn McCall // ...automatic... 17181cd76e8ca8f890a4defadcae3372c025ebe7607cJohn McCall if (!VD->hasLocalStorage()) return 0; 17191cd76e8ca8f890a4defadcae3372c025ebe7607cJohn McCall 17201cd76e8ca8f890a4defadcae3372c025ebe7607cJohn McCall // ...non-volatile... 17211cd76e8ca8f890a4defadcae3372c025ebe7607cJohn McCall if (VD->getType().isVolatileQualified()) return 0; 17221cd76e8ca8f890a4defadcae3372c025ebe7607cJohn McCall if (VD->getType()->isReferenceType()) return 0; 17231cd76e8ca8f890a4defadcae3372c025ebe7607cJohn McCall 17241cd76e8ca8f890a4defadcae3372c025ebe7607cJohn McCall // __block variables can't be allocated in a way that permits NRVO. 17251cd76e8ca8f890a4defadcae3372c025ebe7607cJohn McCall if (VD->hasAttr<BlocksAttr>()) return 0; 17261cd76e8ca8f890a4defadcae3372c025ebe7607cJohn McCall 17271cd76e8ca8f890a4defadcae3372c025ebe7607cJohn McCall // Variables with higher required alignment than their type's ABI 17281cd76e8ca8f890a4defadcae3372c025ebe7607cJohn McCall // alignment cannot use NRVO. 17291cd76e8ca8f890a4defadcae3372c025ebe7607cJohn McCall if (VD->hasAttr<AlignedAttr>() && 17301cd76e8ca8f890a4defadcae3372c025ebe7607cJohn McCall Context.getDeclAlign(VD) > Context.getTypeAlignInChars(VD->getType())) 17311cd76e8ca8f890a4defadcae3372c025ebe7607cJohn McCall return 0; 1732dfbb02a16ac8c764b5ba1742450513d6212d2f9fNAKAMURA Takumi 17331cd76e8ca8f890a4defadcae3372c025ebe7607cJohn McCall return VD; 17343c9034cb7ff1d6c1e4ecd1b44c98f553df013c7cDouglas Gregor} 17353c9034cb7ff1d6c1e4ecd1b44c98f553df013c7cDouglas Gregor 173607f402cff25354c5f06f307f19b0c57c09d964bdDouglas Gregor/// \brief Perform the initialization of a potentially-movable value, which 173707f402cff25354c5f06f307f19b0c57c09d964bdDouglas Gregor/// is the result of return value. 1738cc15f010672a13b38104a32e3cefc7adc07ffbf7Douglas Gregor/// 1739cc15f010672a13b38104a32e3cefc7adc07ffbf7Douglas Gregor/// This routine implements C++0x [class.copy]p33, which attempts to treat 1740cc15f010672a13b38104a32e3cefc7adc07ffbf7Douglas Gregor/// returned lvalues as rvalues in certain cases (to prefer move construction), 1741cc15f010672a13b38104a32e3cefc7adc07ffbf7Douglas Gregor/// then falls back to treating them as lvalues if that failed. 1742dfbb02a16ac8c764b5ba1742450513d6212d2f9fNAKAMURA TakumiExprResult 174307f402cff25354c5f06f307f19b0c57c09d964bdDouglas GregorSema::PerformMoveOrCopyInitialization(const InitializedEntity &Entity, 174407f402cff25354c5f06f307f19b0c57c09d964bdDouglas Gregor const VarDecl *NRVOCandidate, 174507f402cff25354c5f06f307f19b0c57c09d964bdDouglas Gregor QualType ResultType, 1746bca01b46850f867b2f4137f25c882022b58f8471Douglas Gregor Expr *Value, 1747bca01b46850f867b2f4137f25c882022b58f8471Douglas Gregor bool AllowNRVO) { 1748cc15f010672a13b38104a32e3cefc7adc07ffbf7Douglas Gregor // C++0x [class.copy]p33: 1749dfbb02a16ac8c764b5ba1742450513d6212d2f9fNAKAMURA Takumi // When the criteria for elision of a copy operation are met or would 1750dfbb02a16ac8c764b5ba1742450513d6212d2f9fNAKAMURA Takumi // be met save for the fact that the source object is a function 1751dfbb02a16ac8c764b5ba1742450513d6212d2f9fNAKAMURA Takumi // parameter, and the object to be copied is designated by an lvalue, 1752cc15f010672a13b38104a32e3cefc7adc07ffbf7Douglas Gregor // overload resolution to select the constructor for the copy is first 1753cc15f010672a13b38104a32e3cefc7adc07ffbf7Douglas Gregor // performed as if the object were designated by an rvalue. 1754cc15f010672a13b38104a32e3cefc7adc07ffbf7Douglas Gregor ExprResult Res = ExprError(); 1755bca01b46850f867b2f4137f25c882022b58f8471Douglas Gregor if (AllowNRVO && 1756bca01b46850f867b2f4137f25c882022b58f8471Douglas Gregor (NRVOCandidate || getCopyElisionCandidate(ResultType, Value, true))) { 1757dfbb02a16ac8c764b5ba1742450513d6212d2f9fNAKAMURA Takumi ImplicitCastExpr AsRvalue(ImplicitCastExpr::OnStack, 175807f402cff25354c5f06f307f19b0c57c09d964bdDouglas Gregor Value->getType(), CK_LValueToRValue, 175907f402cff25354c5f06f307f19b0c57c09d964bdDouglas Gregor Value, VK_XValue); 1760dfbb02a16ac8c764b5ba1742450513d6212d2f9fNAKAMURA Takumi 1761cc15f010672a13b38104a32e3cefc7adc07ffbf7Douglas Gregor Expr *InitExpr = &AsRvalue; 1762dfbb02a16ac8c764b5ba1742450513d6212d2f9fNAKAMURA Takumi InitializationKind Kind 176307f402cff25354c5f06f307f19b0c57c09d964bdDouglas Gregor = InitializationKind::CreateCopy(Value->getLocStart(), 176407f402cff25354c5f06f307f19b0c57c09d964bdDouglas Gregor Value->getLocStart()); 176507f402cff25354c5f06f307f19b0c57c09d964bdDouglas Gregor InitializationSequence Seq(*this, Entity, Kind, &InitExpr, 1); 1766dfbb02a16ac8c764b5ba1742450513d6212d2f9fNAKAMURA Takumi 1767dfbb02a16ac8c764b5ba1742450513d6212d2f9fNAKAMURA Takumi // [...] If overload resolution fails, or if the type of the first 1768cc15f010672a13b38104a32e3cefc7adc07ffbf7Douglas Gregor // parameter of the selected constructor is not an rvalue reference 17690099530a2288df7c2140dd8992b7310b9f6930a9NAKAMURA Takumi // to the object's type (possibly cv-qualified), overload resolution 1770cc15f010672a13b38104a32e3cefc7adc07ffbf7Douglas Gregor // is performed again, considering the object as an lvalue. 1771383616cd2e61131a534afd9364ef53f643e1f834Sebastian Redl if (Seq) { 1772cc15f010672a13b38104a32e3cefc7adc07ffbf7Douglas Gregor for (InitializationSequence::step_iterator Step = Seq.step_begin(), 1773cc15f010672a13b38104a32e3cefc7adc07ffbf7Douglas Gregor StepEnd = Seq.step_end(); 1774cc15f010672a13b38104a32e3cefc7adc07ffbf7Douglas Gregor Step != StepEnd; ++Step) { 1775383616cd2e61131a534afd9364ef53f643e1f834Sebastian Redl if (Step->Kind != InitializationSequence::SK_ConstructorInitialization) 1776cc15f010672a13b38104a32e3cefc7adc07ffbf7Douglas Gregor continue; 1777dfbb02a16ac8c764b5ba1742450513d6212d2f9fNAKAMURA Takumi 1778dfbb02a16ac8c764b5ba1742450513d6212d2f9fNAKAMURA Takumi CXXConstructorDecl *Constructor 1779cc15f010672a13b38104a32e3cefc7adc07ffbf7Douglas Gregor = cast<CXXConstructorDecl>(Step->Function.Function); 1780dfbb02a16ac8c764b5ba1742450513d6212d2f9fNAKAMURA Takumi 1781cc15f010672a13b38104a32e3cefc7adc07ffbf7Douglas Gregor const RValueReferenceType *RRefType 178207f402cff25354c5f06f307f19b0c57c09d964bdDouglas Gregor = Constructor->getParamDecl(0)->getType() 178307f402cff25354c5f06f307f19b0c57c09d964bdDouglas Gregor ->getAs<RValueReferenceType>(); 1784dfbb02a16ac8c764b5ba1742450513d6212d2f9fNAKAMURA Takumi 1785cc15f010672a13b38104a32e3cefc7adc07ffbf7Douglas Gregor // If we don't meet the criteria, break out now. 1786dfbb02a16ac8c764b5ba1742450513d6212d2f9fNAKAMURA Takumi if (!RRefType || 178707f402cff25354c5f06f307f19b0c57c09d964bdDouglas Gregor !Context.hasSameUnqualifiedType(RRefType->getPointeeType(), 178807f402cff25354c5f06f307f19b0c57c09d964bdDouglas Gregor Context.getTypeDeclType(Constructor->getParent()))) 1789cc15f010672a13b38104a32e3cefc7adc07ffbf7Douglas Gregor break; 1790dfbb02a16ac8c764b5ba1742450513d6212d2f9fNAKAMURA Takumi 1791cc15f010672a13b38104a32e3cefc7adc07ffbf7Douglas Gregor // Promote "AsRvalue" to the heap, since we now need this 1792cc15f010672a13b38104a32e3cefc7adc07ffbf7Douglas Gregor // expression node to persist. 179307f402cff25354c5f06f307f19b0c57c09d964bdDouglas Gregor Value = ImplicitCastExpr::Create(Context, Value->getType(), 1794dfbb02a16ac8c764b5ba1742450513d6212d2f9fNAKAMURA Takumi CK_LValueToRValue, Value, 0, 179507f402cff25354c5f06f307f19b0c57c09d964bdDouglas Gregor VK_XValue); 1796dfbb02a16ac8c764b5ba1742450513d6212d2f9fNAKAMURA Takumi 1797cc15f010672a13b38104a32e3cefc7adc07ffbf7Douglas Gregor // Complete type-checking the initialization of the return type 1798cc15f010672a13b38104a32e3cefc7adc07ffbf7Douglas Gregor // using the constructor we found. 179907f402cff25354c5f06f307f19b0c57c09d964bdDouglas Gregor Res = Seq.Perform(*this, Entity, Kind, MultiExprArg(&Value, 1)); 1800cc15f010672a13b38104a32e3cefc7adc07ffbf7Douglas Gregor } 1801cc15f010672a13b38104a32e3cefc7adc07ffbf7Douglas Gregor } 1802cc15f010672a13b38104a32e3cefc7adc07ffbf7Douglas Gregor } 1803dfbb02a16ac8c764b5ba1742450513d6212d2f9fNAKAMURA Takumi 1804cc15f010672a13b38104a32e3cefc7adc07ffbf7Douglas Gregor // Either we didn't meet the criteria for treating an lvalue as an rvalue, 1805dfbb02a16ac8c764b5ba1742450513d6212d2f9fNAKAMURA Takumi // above, or overload resolution failed. Either way, we need to try 1806cc15f010672a13b38104a32e3cefc7adc07ffbf7Douglas Gregor // (again) now with the return value expression as written. 1807cc15f010672a13b38104a32e3cefc7adc07ffbf7Douglas Gregor if (Res.isInvalid()) 180807f402cff25354c5f06f307f19b0c57c09d964bdDouglas Gregor Res = PerformCopyInitialization(Entity, SourceLocation(), Value); 1809dfbb02a16ac8c764b5ba1742450513d6212d2f9fNAKAMURA Takumi 1810cc15f010672a13b38104a32e3cefc7adc07ffbf7Douglas Gregor return Res; 1811cc15f010672a13b38104a32e3cefc7adc07ffbf7Douglas Gregor} 1812cc15f010672a13b38104a32e3cefc7adc07ffbf7Douglas Gregor 181384b007fae6c0cd30fa07074d34fbe2bf61fa44f9Eli Friedman/// ActOnCapScopeReturnStmt - Utility routine to type-check return statements 181484b007fae6c0cd30fa07074d34fbe2bf61fa44f9Eli Friedman/// for capturing scopes. 18154eb206bebcdab28ababe8df55c6185cec2cdc071Steve Naroff/// 181660d7b3a319d84d688752be3870615ac0f111fb16John McCallStmtResult 181784b007fae6c0cd30fa07074d34fbe2bf61fa44f9Eli FriedmanSema::ActOnCapScopeReturnStmt(SourceLocation ReturnLoc, Expr *RetValExp) { 181884b007fae6c0cd30fa07074d34fbe2bf61fa44f9Eli Friedman // If this is the first return we've seen, infer the return type. 181984b007fae6c0cd30fa07074d34fbe2bf61fa44f9Eli Friedman // [expr.prim.lambda]p4 in C++11; block literals follow a superset of those 182084b007fae6c0cd30fa07074d34fbe2bf61fa44f9Eli Friedman // rules which allows multiple return statements. 182184b007fae6c0cd30fa07074d34fbe2bf61fa44f9Eli Friedman CapturingScopeInfo *CurCap = cast<CapturingScopeInfo>(getCurFunction()); 182284b007fae6c0cd30fa07074d34fbe2bf61fa44f9Eli Friedman if (CurCap->HasImplicitReturnType) { 182384b007fae6c0cd30fa07074d34fbe2bf61fa44f9Eli Friedman QualType ReturnT; 1824a0c2b21e0d84ad289781e08e14148da6b8b8b76dDouglas Gregor if (RetValExp && !isa<InitListExpr>(RetValExp)) { 1825429bb276991ff2dbc7c5b438828b9b7737cb15ebJohn Wiegley ExprResult Result = DefaultFunctionArrayLvalueConversion(RetValExp); 1826429bb276991ff2dbc7c5b438828b9b7737cb15ebJohn Wiegley if (Result.isInvalid()) 1827429bb276991ff2dbc7c5b438828b9b7737cb15ebJohn Wiegley return StmtError(); 1828429bb276991ff2dbc7c5b438828b9b7737cb15ebJohn Wiegley RetValExp = Result.take(); 18296a576ab708d3aa7d40e5d867ab1de5d3cb507553Douglas Gregor 183084b007fae6c0cd30fa07074d34fbe2bf61fa44f9Eli Friedman if (!RetValExp->isTypeDependent()) 183184b007fae6c0cd30fa07074d34fbe2bf61fa44f9Eli Friedman ReturnT = RetValExp->getType(); 183284b007fae6c0cd30fa07074d34fbe2bf61fa44f9Eli Friedman else 183384b007fae6c0cd30fa07074d34fbe2bf61fa44f9Eli Friedman ReturnT = Context.DependentTy; 1834a0c2b21e0d84ad289781e08e14148da6b8b8b76dDouglas Gregor } else { 1835a0c2b21e0d84ad289781e08e14148da6b8b8b76dDouglas Gregor if (RetValExp) { 1836a0c2b21e0d84ad289781e08e14148da6b8b8b76dDouglas Gregor // C++11 [expr.lambda.prim]p4 bans inferring the result from an 1837a0c2b21e0d84ad289781e08e14148da6b8b8b76dDouglas Gregor // initializer list, because it is not an expression (even 1838a0c2b21e0d84ad289781e08e14148da6b8b8b76dDouglas Gregor // though we represent it as one). We still deduce 'void'. 1839a0c2b21e0d84ad289781e08e14148da6b8b8b76dDouglas Gregor Diag(ReturnLoc, diag::err_lambda_return_init_list) 1840a0c2b21e0d84ad289781e08e14148da6b8b8b76dDouglas Gregor << RetValExp->getSourceRange(); 1841a0c2b21e0d84ad289781e08e14148da6b8b8b76dDouglas Gregor } 1842a0c2b21e0d84ad289781e08e14148da6b8b8b76dDouglas Gregor 184384b007fae6c0cd30fa07074d34fbe2bf61fa44f9Eli Friedman ReturnT = Context.VoidTy; 184484b007fae6c0cd30fa07074d34fbe2bf61fa44f9Eli Friedman } 184584b007fae6c0cd30fa07074d34fbe2bf61fa44f9Eli Friedman // We require the return types to strictly match here. 184684b007fae6c0cd30fa07074d34fbe2bf61fa44f9Eli Friedman if (!CurCap->ReturnType.isNull() && 184784b007fae6c0cd30fa07074d34fbe2bf61fa44f9Eli Friedman !CurCap->ReturnType->isDependentType() && 184884b007fae6c0cd30fa07074d34fbe2bf61fa44f9Eli Friedman !ReturnT->isDependentType() && 184984b007fae6c0cd30fa07074d34fbe2bf61fa44f9Eli Friedman !Context.hasSameType(ReturnT, CurCap->ReturnType)) { 185084b007fae6c0cd30fa07074d34fbe2bf61fa44f9Eli Friedman Diag(ReturnLoc, diag::err_typecheck_missing_return_type_incompatible) 18514e88df72e690498aeba2dc3d5089388b27be66faDouglas Gregor << ReturnT << CurCap->ReturnType 18520bcc3d87223d7796946bfa6dd6174af900d8eba4Douglas Gregor << (getCurLambda() != 0); 185384b007fae6c0cd30fa07074d34fbe2bf61fa44f9Eli Friedman return StmtError(); 1854649657e7d6c150136cae5ab22e39b9794cff80ccFariborz Jahanian } 185584b007fae6c0cd30fa07074d34fbe2bf61fa44f9Eli Friedman CurCap->ReturnType = ReturnT; 18564eb206bebcdab28ababe8df55c6185cec2cdc071Steve Naroff } 185784b007fae6c0cd30fa07074d34fbe2bf61fa44f9Eli Friedman QualType FnRetType = CurCap->ReturnType; 185884b007fae6c0cd30fa07074d34fbe2bf61fa44f9Eli Friedman assert(!FnRetType.isNull()); 18594cffe2fd5c23168bc08f0453c684cbd3f79471d3Sebastian Redl 1860793cd1c4cdfaafc52e2c2ad9dae959befe4bb166Douglas Gregor if (BlockScopeInfo *CurBlock = dyn_cast<BlockScopeInfo>(CurCap)) { 186184b007fae6c0cd30fa07074d34fbe2bf61fa44f9Eli Friedman if (CurBlock->FunctionType->getAs<FunctionType>()->getNoReturnAttr()) { 186284b007fae6c0cd30fa07074d34fbe2bf61fa44f9Eli Friedman Diag(ReturnLoc, diag::err_noreturn_block_has_return_expr); 186384b007fae6c0cd30fa07074d34fbe2bf61fa44f9Eli Friedman return StmtError(); 186484b007fae6c0cd30fa07074d34fbe2bf61fa44f9Eli Friedman } 1865793cd1c4cdfaafc52e2c2ad9dae959befe4bb166Douglas Gregor } else { 1866793cd1c4cdfaafc52e2c2ad9dae959befe4bb166Douglas Gregor LambdaScopeInfo *LSI = cast<LambdaScopeInfo>(CurCap); 1867793cd1c4cdfaafc52e2c2ad9dae959befe4bb166Douglas Gregor if (LSI->CallOperator->getType()->getAs<FunctionType>()->getNoReturnAttr()){ 1868793cd1c4cdfaafc52e2c2ad9dae959befe4bb166Douglas Gregor Diag(ReturnLoc, diag::err_noreturn_lambda_has_return_expr); 1869793cd1c4cdfaafc52e2c2ad9dae959befe4bb166Douglas Gregor return StmtError(); 1870793cd1c4cdfaafc52e2c2ad9dae959befe4bb166Douglas Gregor } 1871793cd1c4cdfaafc52e2c2ad9dae959befe4bb166Douglas Gregor } 18726c92fa75e62937f9738696840efcb258560f4568Mike Stump 18734eb206bebcdab28ababe8df55c6185cec2cdc071Steve Naroff // Otherwise, verify that this result type matches the previous one. We are 18744eb206bebcdab28ababe8df55c6185cec2cdc071Steve Naroff // pickier with blocks than for normal functions because we don't have GCC 18754eb206bebcdab28ababe8df55c6185cec2cdc071Steve Naroff // compatibility to worry about here. 1876d963c37eb912342c8325048749e449861cf0a6e3John McCall const VarDecl *NRVOCandidate = 0; 18770a7efe1142d241678c91bf93ee6adb51289863a4John McCall if (FnRetType->isDependentType()) { 18780a7efe1142d241678c91bf93ee6adb51289863a4John McCall // Delay processing for now. TODO: there are lots of dependent 18790a7efe1142d241678c91bf93ee6adb51289863a4John McCall // types we can conclusively prove aren't void. 18800a7efe1142d241678c91bf93ee6adb51289863a4John McCall } else if (FnRetType->isVoidType()) { 18810a7efe1142d241678c91bf93ee6adb51289863a4John McCall if (RetValExp && 18820a7efe1142d241678c91bf93ee6adb51289863a4John McCall !(getLangOptions().CPlusPlus && 18830a7efe1142d241678c91bf93ee6adb51289863a4John McCall (RetValExp->isTypeDependent() || 18840a7efe1142d241678c91bf93ee6adb51289863a4John McCall RetValExp->getType()->isVoidType()))) { 18854eb206bebcdab28ababe8df55c6185cec2cdc071Steve Naroff Diag(ReturnLoc, diag::err_return_block_has_expr); 18864eb206bebcdab28ababe8df55c6185cec2cdc071Steve Naroff RetValExp = 0; 18874eb206bebcdab28ababe8df55c6185cec2cdc071Steve Naroff } 18885077c3876beeaed32280af88244e8050078619a8Douglas Gregor } else if (!RetValExp) { 18890a7efe1142d241678c91bf93ee6adb51289863a4John McCall return StmtError(Diag(ReturnLoc, diag::err_block_return_missing_expr)); 18900a7efe1142d241678c91bf93ee6adb51289863a4John McCall } else if (!RetValExp->isTypeDependent()) { 18910a7efe1142d241678c91bf93ee6adb51289863a4John McCall // we have a non-void block with an expression, continue checking 18920a7efe1142d241678c91bf93ee6adb51289863a4John McCall 18930a7efe1142d241678c91bf93ee6adb51289863a4John McCall // C99 6.8.6.4p3(136): The return statement is not an assignment. The 18940a7efe1142d241678c91bf93ee6adb51289863a4John McCall // overlap restriction of subclause 6.5.16.1 does not apply to the case of 18950a7efe1142d241678c91bf93ee6adb51289863a4John McCall // function return. 18960a7efe1142d241678c91bf93ee6adb51289863a4John McCall 18970a7efe1142d241678c91bf93ee6adb51289863a4John McCall // In C++ the return statement is handled via a copy initialization. 18980a7efe1142d241678c91bf93ee6adb51289863a4John McCall // the C version of which boils down to CheckSingleAssignmentConstraints. 18990a7efe1142d241678c91bf93ee6adb51289863a4John McCall NRVOCandidate = getCopyElisionCandidate(FnRetType, RetValExp, false); 19000a7efe1142d241678c91bf93ee6adb51289863a4John McCall InitializedEntity Entity = InitializedEntity::InitializeResult(ReturnLoc, 19010a7efe1142d241678c91bf93ee6adb51289863a4John McCall FnRetType, 19020586520acb2f368c874943353a222be7f00c3068Fariborz Jahanian NRVOCandidate != 0); 19030a7efe1142d241678c91bf93ee6adb51289863a4John McCall ExprResult Res = PerformMoveOrCopyInitialization(Entity, NRVOCandidate, 19040a7efe1142d241678c91bf93ee6adb51289863a4John McCall FnRetType, RetValExp); 19050a7efe1142d241678c91bf93ee6adb51289863a4John McCall if (Res.isInvalid()) { 19060a7efe1142d241678c91bf93ee6adb51289863a4John McCall // FIXME: Cleanup temporaries here, anyway? 19070a7efe1142d241678c91bf93ee6adb51289863a4John McCall return StmtError(); 1908c6acbc58a7aef0a3382775424c80e9534b54b2edAnders Carlsson } 19090a7efe1142d241678c91bf93ee6adb51289863a4John McCall RetValExp = Res.take(); 19100a7efe1142d241678c91bf93ee6adb51289863a4John McCall CheckReturnStackAddr(RetValExp, FnRetType, ReturnLoc); 1911d963c37eb912342c8325048749e449861cf0a6e3John McCall } 1912dfbb02a16ac8c764b5ba1742450513d6212d2f9fNAKAMURA Takumi 1913d963c37eb912342c8325048749e449861cf0a6e3John McCall if (RetValExp) { 1914d963c37eb912342c8325048749e449861cf0a6e3John McCall CheckImplicitConversions(RetValExp, ReturnLoc); 1915d963c37eb912342c8325048749e449861cf0a6e3John McCall RetValExp = MaybeCreateExprWithCleanups(RetValExp); 191698eb8a7a702b95183ed015706b1f1c66f5cb27a4Mike Stump } 19170a7efe1142d241678c91bf93ee6adb51289863a4John McCall ReturnStmt *Result = new (Context) ReturnStmt(ReturnLoc, RetValExp, 19180a7efe1142d241678c91bf93ee6adb51289863a4John McCall NRVOCandidate); 19194cffe2fd5c23168bc08f0453c684cbd3f79471d3Sebastian Redl 1920dfbb02a16ac8c764b5ba1742450513d6212d2f9fNAKAMURA Takumi // If we need to check for the named return value optimization, save the 19215077c3876beeaed32280af88244e8050078619a8Douglas Gregor // return statement in our scope for later processing. 19226a576ab708d3aa7d40e5d867ab1de5d3cb507553Douglas Gregor if (getLangOptions().CPlusPlus && FnRetType->isRecordType() && 19235077c3876beeaed32280af88244e8050078619a8Douglas Gregor !CurContext->isDependentContext()) 19245077c3876beeaed32280af88244e8050078619a8Douglas Gregor FunctionScopes.back()->Returns.push_back(Result); 1925dfbb02a16ac8c764b5ba1742450513d6212d2f9fNAKAMURA Takumi 19265077c3876beeaed32280af88244e8050078619a8Douglas Gregor return Owned(Result); 19274eb206bebcdab28ababe8df55c6185cec2cdc071Steve Naroff} 19285f016e2cb5d11daeb237544de1c5d59f20fe1a6eReid Spencer 192960d7b3a319d84d688752be3870615ac0f111fb16John McCallStmtResult 19309ae2f076ca5ab1feb3ba95629099ec2319833701John McCallSema::ActOnReturnStmt(SourceLocation ReturnLoc, Expr *RetValExp) { 1931fc92137eee708b632c00a9b0934ff87aeae234a5Douglas Gregor // Check for unexpanded parameter packs. 1932fc92137eee708b632c00a9b0934ff87aeae234a5Douglas Gregor if (RetValExp && DiagnoseUnexpandedParameterPack(RetValExp)) 1933fc92137eee708b632c00a9b0934ff87aeae234a5Douglas Gregor return StmtError(); 1934fc92137eee708b632c00a9b0934ff87aeae234a5Douglas Gregor 193584b007fae6c0cd30fa07074d34fbe2bf61fa44f9Eli Friedman if (isa<CapturingScopeInfo>(getCurFunction())) 193684b007fae6c0cd30fa07074d34fbe2bf61fa44f9Eli Friedman return ActOnCapScopeReturnStmt(ReturnLoc, RetValExp); 19374cffe2fd5c23168bc08f0453c684cbd3f79471d3Sebastian Redl 1938371f258e61e1365b951b17931a3c5ac1530fd1a0Chris Lattner QualType FnRetType; 1939926df6cfabf3eaa4afc990c097fa4619b76a9b57Douglas Gregor QualType DeclaredRetType; 1940f7c41dab1a8de29b0991e853b8822bb0d1ddc01cMike Stump if (const FunctionDecl *FD = getCurFunctionDecl()) { 1941371f258e61e1365b951b17931a3c5ac1530fd1a0Chris Lattner FnRetType = FD->getResultType(); 1942926df6cfabf3eaa4afc990c097fa4619b76a9b57Douglas Gregor DeclaredRetType = FnRetType; 194304a67a6aa3dfdc92d57f7f8d93ba397348c868a4John McCall if (FD->hasAttr<NoReturnAttr>() || 194404a67a6aa3dfdc92d57f7f8d93ba397348c868a4John McCall FD->getType()->getAs<FunctionType>()->getNoReturnAttr()) 19458662587fa75d3fb04f873e265841c9314c7f5523Chris Lattner Diag(ReturnLoc, diag::warn_noreturn_function_has_return_expr) 194679430e9983f5e67a378fc1f50cd6278f2cea8259Eli Friedman << FD->getDeclName(); 1947926df6cfabf3eaa4afc990c097fa4619b76a9b57Douglas Gregor } else if (ObjCMethodDecl *MD = getCurMethodDecl()) { 1948926df6cfabf3eaa4afc990c097fa4619b76a9b57Douglas Gregor DeclaredRetType = MD->getResultType(); 1949926df6cfabf3eaa4afc990c097fa4619b76a9b57Douglas Gregor if (MD->hasRelatedResultType() && MD->getClassInterface()) { 1950926df6cfabf3eaa4afc990c097fa4619b76a9b57Douglas Gregor // In the implementation of a method with a related return type, the 1951926df6cfabf3eaa4afc990c097fa4619b76a9b57Douglas Gregor // type used to type-check the validity of return statements within the 1952926df6cfabf3eaa4afc990c097fa4619b76a9b57Douglas Gregor // method body is a pointer to the type of the class being implemented. 1953926df6cfabf3eaa4afc990c097fa4619b76a9b57Douglas Gregor FnRetType = Context.getObjCInterfaceType(MD->getClassInterface()); 1954926df6cfabf3eaa4afc990c097fa4619b76a9b57Douglas Gregor FnRetType = Context.getObjCObjectPointerType(FnRetType); 1955926df6cfabf3eaa4afc990c097fa4619b76a9b57Douglas Gregor } else { 1956926df6cfabf3eaa4afc990c097fa4619b76a9b57Douglas Gregor FnRetType = DeclaredRetType; 1957926df6cfabf3eaa4afc990c097fa4619b76a9b57Douglas Gregor } 1958926df6cfabf3eaa4afc990c097fa4619b76a9b57Douglas Gregor } else // If we don't have a function/method context, bail. 1959c97fb9a394ce2cc5e664fcb472e93553528378adSteve Naroff return StmtError(); 19601eb4433ac451dc16f4133a88af2d002ac26c58efMike Stump 19615077c3876beeaed32280af88244e8050078619a8Douglas Gregor ReturnStmt *Result = 0; 19625cf216b7fa64b933b60743b0b26053e8e7aa87beChris Lattner if (FnRetType->isVoidType()) { 19638d7946151cd15c0e7c34250c122d59b2f5027999Nick Lewycky if (RetValExp) { 19648d7946151cd15c0e7c34250c122d59b2f5027999Nick Lewycky if (!RetValExp->isTypeDependent()) { 19658d7946151cd15c0e7c34250c122d59b2f5027999Nick Lewycky // C99 6.8.6.4p1 (ext_ since GCC warns) 19668d7946151cd15c0e7c34250c122d59b2f5027999Nick Lewycky unsigned D = diag::ext_return_has_expr; 19678d7946151cd15c0e7c34250c122d59b2f5027999Nick Lewycky if (RetValExp->getType()->isVoidType()) 19688d7946151cd15c0e7c34250c122d59b2f5027999Nick Lewycky D = diag::ext_return_has_void_expr; 19698d7946151cd15c0e7c34250c122d59b2f5027999Nick Lewycky else { 19708d7946151cd15c0e7c34250c122d59b2f5027999Nick Lewycky ExprResult Result = Owned(RetValExp); 19718d7946151cd15c0e7c34250c122d59b2f5027999Nick Lewycky Result = IgnoredValueConversions(Result.take()); 19728d7946151cd15c0e7c34250c122d59b2f5027999Nick Lewycky if (Result.isInvalid()) 19738d7946151cd15c0e7c34250c122d59b2f5027999Nick Lewycky return StmtError(); 19748d7946151cd15c0e7c34250c122d59b2f5027999Nick Lewycky RetValExp = Result.take(); 19758d7946151cd15c0e7c34250c122d59b2f5027999Nick Lewycky RetValExp = ImpCastExprToType(RetValExp, 19768d7946151cd15c0e7c34250c122d59b2f5027999Nick Lewycky Context.VoidTy, CK_ToVoid).take(); 19778d7946151cd15c0e7c34250c122d59b2f5027999Nick Lewycky } 19784cffe2fd5c23168bc08f0453c684cbd3f79471d3Sebastian Redl 19798d7946151cd15c0e7c34250c122d59b2f5027999Nick Lewycky // return (some void expression); is legal in C++. 19808d7946151cd15c0e7c34250c122d59b2f5027999Nick Lewycky if (D != diag::ext_return_has_void_expr || 19818d7946151cd15c0e7c34250c122d59b2f5027999Nick Lewycky !getLangOptions().CPlusPlus) { 19828d7946151cd15c0e7c34250c122d59b2f5027999Nick Lewycky NamedDecl *CurDecl = getCurFunctionOrMethodDecl(); 1983ca0d0d4a0d6ecd256d4bf8c1a0dc183a83119833Chandler Carruth 1984ca0d0d4a0d6ecd256d4bf8c1a0dc183a83119833Chandler Carruth int FunctionKind = 0; 1985ca0d0d4a0d6ecd256d4bf8c1a0dc183a83119833Chandler Carruth if (isa<ObjCMethodDecl>(CurDecl)) 1986ca0d0d4a0d6ecd256d4bf8c1a0dc183a83119833Chandler Carruth FunctionKind = 1; 1987ca0d0d4a0d6ecd256d4bf8c1a0dc183a83119833Chandler Carruth else if (isa<CXXConstructorDecl>(CurDecl)) 1988ca0d0d4a0d6ecd256d4bf8c1a0dc183a83119833Chandler Carruth FunctionKind = 2; 1989ca0d0d4a0d6ecd256d4bf8c1a0dc183a83119833Chandler Carruth else if (isa<CXXDestructorDecl>(CurDecl)) 1990ca0d0d4a0d6ecd256d4bf8c1a0dc183a83119833Chandler Carruth FunctionKind = 3; 1991ca0d0d4a0d6ecd256d4bf8c1a0dc183a83119833Chandler Carruth 19928d7946151cd15c0e7c34250c122d59b2f5027999Nick Lewycky Diag(ReturnLoc, D) 1993ca0d0d4a0d6ecd256d4bf8c1a0dc183a83119833Chandler Carruth << CurDecl->getDeclName() << FunctionKind 19948d7946151cd15c0e7c34250c122d59b2f5027999Nick Lewycky << RetValExp->getSourceRange(); 19958d7946151cd15c0e7c34250c122d59b2f5027999Nick Lewycky } 1996e878eb035b343d7d819c092102364ec9849716aeChris Lattner } 19971eb4433ac451dc16f4133a88af2d002ac26c58efMike Stump 1998b4eb64d8426c0eaa58d398961e0e74ff85063d7cJohn McCall CheckImplicitConversions(RetValExp, ReturnLoc); 19994765fa05b5652fcc4356371c2f481d0ea9a1b007John McCall RetValExp = MaybeCreateExprWithCleanups(RetValExp); 20005f016e2cb5d11daeb237544de1c5d59f20fe1a6eReid Spencer } 2001dfbb02a16ac8c764b5ba1742450513d6212d2f9fNAKAMURA Takumi 20025077c3876beeaed32280af88244e8050078619a8Douglas Gregor Result = new (Context) ReturnStmt(ReturnLoc, RetValExp, 0); 20035077c3876beeaed32280af88244e8050078619a8Douglas Gregor } else if (!RetValExp && !FnRetType->isDependentType()) { 20043c73c41cefcfe76f36b7bed72c9f1ec195490951Chris Lattner unsigned DiagID = diag::warn_return_missing_expr; // C90 6.6.6.4p4 20053c73c41cefcfe76f36b7bed72c9f1ec195490951Chris Lattner // C99 6.8.6.4p1 (ext_ since GCC warns) 20063c73c41cefcfe76f36b7bed72c9f1ec195490951Chris Lattner if (getLangOptions().C99) DiagID = diag::ext_return_missing_expr; 20073c73c41cefcfe76f36b7bed72c9f1ec195490951Chris Lattner 20083c73c41cefcfe76f36b7bed72c9f1ec195490951Chris Lattner if (FunctionDecl *FD = getCurFunctionDecl()) 200908631c5fa053867146b5ee8be658c229f6bf127cChris Lattner Diag(ReturnLoc, DiagID) << FD->getIdentifier() << 0/*fn*/; 20103c73c41cefcfe76f36b7bed72c9f1ec195490951Chris Lattner else 201108631c5fa053867146b5ee8be658c229f6bf127cChris Lattner Diag(ReturnLoc, DiagID) << getCurMethodDecl()->getDeclName() << 1/*meth*/; 20125077c3876beeaed32280af88244e8050078619a8Douglas Gregor Result = new (Context) ReturnStmt(ReturnLoc); 20135077c3876beeaed32280af88244e8050078619a8Douglas Gregor } else { 20145077c3876beeaed32280af88244e8050078619a8Douglas Gregor const VarDecl *NRVOCandidate = 0; 20155077c3876beeaed32280af88244e8050078619a8Douglas Gregor if (!FnRetType->isDependentType() && !RetValExp->isTypeDependent()) { 20165077c3876beeaed32280af88244e8050078619a8Douglas Gregor // we have a non-void function with an expression, continue checking 20175077c3876beeaed32280af88244e8050078619a8Douglas Gregor 20185077c3876beeaed32280af88244e8050078619a8Douglas Gregor // C99 6.8.6.4p3(136): The return statement is not an assignment. The 20195077c3876beeaed32280af88244e8050078619a8Douglas Gregor // overlap restriction of subclause 6.5.16.1 does not apply to the case of 20205077c3876beeaed32280af88244e8050078619a8Douglas Gregor // function return. 20215077c3876beeaed32280af88244e8050078619a8Douglas Gregor 2022856d3798af7c2f7251e4a295f3da7a09ce4c62abJohn McCall // In C++ the return statement is handled via a copy initialization, 20235077c3876beeaed32280af88244e8050078619a8Douglas Gregor // the C version of which boils down to CheckSingleAssignmentConstraints. 2024f5d8f466c3eebaffc51468812bdcbe7f0fe4891aDouglas Gregor NRVOCandidate = getCopyElisionCandidate(FnRetType, RetValExp, false); 2025dfbb02a16ac8c764b5ba1742450513d6212d2f9fNAKAMURA Takumi InitializedEntity Entity = InitializedEntity::InitializeResult(ReturnLoc, 202607f402cff25354c5f06f307f19b0c57c09d964bdDouglas Gregor FnRetType, 202758f14c012e5d739b09532bb12645dc161f88cfcfFrancois Pichet NRVOCandidate != 0); 2028dfbb02a16ac8c764b5ba1742450513d6212d2f9fNAKAMURA Takumi ExprResult Res = PerformMoveOrCopyInitialization(Entity, NRVOCandidate, 202907f402cff25354c5f06f307f19b0c57c09d964bdDouglas Gregor FnRetType, RetValExp); 20305077c3876beeaed32280af88244e8050078619a8Douglas Gregor if (Res.isInvalid()) { 20315077c3876beeaed32280af88244e8050078619a8Douglas Gregor // FIXME: Cleanup temporaries here, anyway? 20325077c3876beeaed32280af88244e8050078619a8Douglas Gregor return StmtError(); 20335077c3876beeaed32280af88244e8050078619a8Douglas Gregor } 20344cffe2fd5c23168bc08f0453c684cbd3f79471d3Sebastian Redl 20355077c3876beeaed32280af88244e8050078619a8Douglas Gregor RetValExp = Res.takeAs<Expr>(); 2036dfbb02a16ac8c764b5ba1742450513d6212d2f9fNAKAMURA Takumi if (RetValExp) 20375077c3876beeaed32280af88244e8050078619a8Douglas Gregor CheckReturnStackAddr(RetValExp, FnRetType, ReturnLoc); 203866724ea67d7d598b937d86fa66f03f09a1c758f3Douglas Gregor } 2039dfbb02a16ac8c764b5ba1742450513d6212d2f9fNAKAMURA Takumi 2040b4eb64d8426c0eaa58d398961e0e74ff85063d7cJohn McCall if (RetValExp) { 2041926df6cfabf3eaa4afc990c097fa4619b76a9b57Douglas Gregor // If we type-checked an Objective-C method's return type based 2042926df6cfabf3eaa4afc990c097fa4619b76a9b57Douglas Gregor // on a related return type, we may need to adjust the return 2043926df6cfabf3eaa4afc990c097fa4619b76a9b57Douglas Gregor // type again. Do so now. 2044926df6cfabf3eaa4afc990c097fa4619b76a9b57Douglas Gregor if (DeclaredRetType != FnRetType) { 2045926df6cfabf3eaa4afc990c097fa4619b76a9b57Douglas Gregor ExprResult result = PerformImplicitConversion(RetValExp, 2046926df6cfabf3eaa4afc990c097fa4619b76a9b57Douglas Gregor DeclaredRetType, 2047926df6cfabf3eaa4afc990c097fa4619b76a9b57Douglas Gregor AA_Returning); 2048926df6cfabf3eaa4afc990c097fa4619b76a9b57Douglas Gregor if (result.isInvalid()) return StmtError(); 2049926df6cfabf3eaa4afc990c097fa4619b76a9b57Douglas Gregor RetValExp = result.take(); 2050926df6cfabf3eaa4afc990c097fa4619b76a9b57Douglas Gregor } 2051926df6cfabf3eaa4afc990c097fa4619b76a9b57Douglas Gregor 2052b4eb64d8426c0eaa58d398961e0e74ff85063d7cJohn McCall CheckImplicitConversions(RetValExp, ReturnLoc); 20534765fa05b5652fcc4356371c2f481d0ea9a1b007John McCall RetValExp = MaybeCreateExprWithCleanups(RetValExp); 2054b4eb64d8426c0eaa58d398961e0e74ff85063d7cJohn McCall } 20555077c3876beeaed32280af88244e8050078619a8Douglas Gregor Result = new (Context) ReturnStmt(ReturnLoc, RetValExp, NRVOCandidate); 2056898574e7496ba8fd76290079d3a9d06954992734Douglas Gregor } 2057dfbb02a16ac8c764b5ba1742450513d6212d2f9fNAKAMURA Takumi 2058dfbb02a16ac8c764b5ba1742450513d6212d2f9fNAKAMURA Takumi // If we need to check for the named return value optimization, save the 20595077c3876beeaed32280af88244e8050078619a8Douglas Gregor // return statement in our scope for later processing. 20605077c3876beeaed32280af88244e8050078619a8Douglas Gregor if (getLangOptions().CPlusPlus && FnRetType->isRecordType() && 20615077c3876beeaed32280af88244e8050078619a8Douglas Gregor !CurContext->isDependentContext()) 20625077c3876beeaed32280af88244e8050078619a8Douglas Gregor FunctionScopes.back()->Returns.push_back(Result); 2063f85e193739c953358c865005855253af4f68a497John McCall 20645077c3876beeaed32280af88244e8050078619a8Douglas Gregor return Owned(Result); 20655f016e2cb5d11daeb237544de1c5d59f20fe1a6eReid Spencer} 20665f016e2cb5d11daeb237544de1c5d59f20fe1a6eReid Spencer 2067810f6d5d6223adaab0ccf0139f40de6484ad1bb5Chris Lattner/// CheckAsmLValue - GNU C has an extremely ugly extension whereby they silently 2068810f6d5d6223adaab0ccf0139f40de6484ad1bb5Chris Lattner/// ignore "noop" casts in places where an lvalue is required by an inline asm. 2069810f6d5d6223adaab0ccf0139f40de6484ad1bb5Chris Lattner/// We emulate this behavior when -fheinous-gnu-extensions is specified, but 2070810f6d5d6223adaab0ccf0139f40de6484ad1bb5Chris Lattner/// provide a strong guidance to not use it. 2071810f6d5d6223adaab0ccf0139f40de6484ad1bb5Chris Lattner/// 2072810f6d5d6223adaab0ccf0139f40de6484ad1bb5Chris Lattner/// This method checks to see if the argument is an acceptable l-value and 2073810f6d5d6223adaab0ccf0139f40de6484ad1bb5Chris Lattner/// returns false if it is a case we can handle. 2074810f6d5d6223adaab0ccf0139f40de6484ad1bb5Chris Lattnerstatic bool CheckAsmLValue(const Expr *E, Sema &S) { 2075703e39486689d6660e75f6b6de0068db031a51c7Anders Carlsson // Type dependent expressions will be checked during instantiation. 2076703e39486689d6660e75f6b6de0068db031a51c7Anders Carlsson if (E->isTypeDependent()) 2077703e39486689d6660e75f6b6de0068db031a51c7Anders Carlsson return false; 2078dfbb02a16ac8c764b5ba1742450513d6212d2f9fNAKAMURA Takumi 20797eb0a9eb0cde8444b97f9c5b713d9be7a6f1e607John McCall if (E->isLValue()) 2080810f6d5d6223adaab0ccf0139f40de6484ad1bb5Chris Lattner return false; // Cool, this is an lvalue. 2081810f6d5d6223adaab0ccf0139f40de6484ad1bb5Chris Lattner 2082810f6d5d6223adaab0ccf0139f40de6484ad1bb5Chris Lattner // Okay, this is not an lvalue, but perhaps it is the result of a cast that we 2083810f6d5d6223adaab0ccf0139f40de6484ad1bb5Chris Lattner // are supposed to allow. 2084810f6d5d6223adaab0ccf0139f40de6484ad1bb5Chris Lattner const Expr *E2 = E->IgnoreParenNoopCasts(S.Context); 20857eb0a9eb0cde8444b97f9c5b713d9be7a6f1e607John McCall if (E != E2 && E2->isLValue()) { 2086810f6d5d6223adaab0ccf0139f40de6484ad1bb5Chris Lattner if (!S.getLangOptions().HeinousExtensions) 2087810f6d5d6223adaab0ccf0139f40de6484ad1bb5Chris Lattner S.Diag(E2->getLocStart(), diag::err_invalid_asm_cast_lvalue) 2088810f6d5d6223adaab0ccf0139f40de6484ad1bb5Chris Lattner << E->getSourceRange(); 2089810f6d5d6223adaab0ccf0139f40de6484ad1bb5Chris Lattner else 2090810f6d5d6223adaab0ccf0139f40de6484ad1bb5Chris Lattner S.Diag(E2->getLocStart(), diag::warn_invalid_asm_cast_lvalue) 2091810f6d5d6223adaab0ccf0139f40de6484ad1bb5Chris Lattner << E->getSourceRange(); 2092810f6d5d6223adaab0ccf0139f40de6484ad1bb5Chris Lattner // Accept, even if we emitted an error diagnostic. 2093810f6d5d6223adaab0ccf0139f40de6484ad1bb5Chris Lattner return false; 2094810f6d5d6223adaab0ccf0139f40de6484ad1bb5Chris Lattner } 2095810f6d5d6223adaab0ccf0139f40de6484ad1bb5Chris Lattner 2096810f6d5d6223adaab0ccf0139f40de6484ad1bb5Chris Lattner // None of the above, just randomly invalid non-lvalue. 2097810f6d5d6223adaab0ccf0139f40de6484ad1bb5Chris Lattner return true; 2098810f6d5d6223adaab0ccf0139f40de6484ad1bb5Chris Lattner} 2099810f6d5d6223adaab0ccf0139f40de6484ad1bb5Chris Lattner 2100ca57b4b7658a031b74cda5ac504311998be8e343Chris Lattner/// isOperandMentioned - Return true if the specified operand # is mentioned 2101ca57b4b7658a031b74cda5ac504311998be8e343Chris Lattner/// anywhere in the decomposed asm string. 2102ca57b4b7658a031b74cda5ac504311998be8e343Chris Lattnerstatic bool isOperandMentioned(unsigned OpNo, 21032d3ba4f5a923a90c3fc290ddfba5e36c2d0a9b46Chris Lattner ArrayRef<AsmStmt::AsmStringPiece> AsmStrPieces) { 2104ca57b4b7658a031b74cda5ac504311998be8e343Chris Lattner for (unsigned p = 0, e = AsmStrPieces.size(); p != e; ++p) { 2105ca57b4b7658a031b74cda5ac504311998be8e343Chris Lattner const AsmStmt::AsmStringPiece &Piece = AsmStrPieces[p]; 2106ca57b4b7658a031b74cda5ac504311998be8e343Chris Lattner if (!Piece.isOperand()) continue; 2107ca57b4b7658a031b74cda5ac504311998be8e343Chris Lattner 2108ca57b4b7658a031b74cda5ac504311998be8e343Chris Lattner // If this is a reference to the input and if the input was the smaller 2109ca57b4b7658a031b74cda5ac504311998be8e343Chris Lattner // one, then we have to reject this asm. 2110ca57b4b7658a031b74cda5ac504311998be8e343Chris Lattner if (Piece.getOperandNo() == OpNo) 2111ca57b4b7658a031b74cda5ac504311998be8e343Chris Lattner return true; 2112ca57b4b7658a031b74cda5ac504311998be8e343Chris Lattner } 2113ca57b4b7658a031b74cda5ac504311998be8e343Chris Lattner 2114ca57b4b7658a031b74cda5ac504311998be8e343Chris Lattner return false; 2115ca57b4b7658a031b74cda5ac504311998be8e343Chris Lattner} 2116810f6d5d6223adaab0ccf0139f40de6484ad1bb5Chris Lattner 2117ca57b4b7658a031b74cda5ac504311998be8e343Chris LattnerStmtResult Sema::ActOnAsmStmt(SourceLocation AsmLoc, bool IsSimple, 2118ca57b4b7658a031b74cda5ac504311998be8e343Chris Lattner bool IsVolatile, unsigned NumOutputs, 2119ca57b4b7658a031b74cda5ac504311998be8e343Chris Lattner unsigned NumInputs, IdentifierInfo **Names, 2120ca57b4b7658a031b74cda5ac504311998be8e343Chris Lattner MultiExprArg constraints, MultiExprArg exprs, 2121ca57b4b7658a031b74cda5ac504311998be8e343Chris Lattner Expr *asmString, MultiExprArg clobbers, 2122ca57b4b7658a031b74cda5ac504311998be8e343Chris Lattner SourceLocation RParenLoc, bool MSAsm) { 21233037ed0a27dba62e522304183718efc149e8b6d9Sebastian Redl unsigned NumClobbers = clobbers.size(); 21243037ed0a27dba62e522304183718efc149e8b6d9Sebastian Redl StringLiteral **Constraints = 21253037ed0a27dba62e522304183718efc149e8b6d9Sebastian Redl reinterpret_cast<StringLiteral**>(constraints.get()); 21269ae2f076ca5ab1feb3ba95629099ec2319833701John McCall Expr **Exprs = exprs.get(); 21279ae2f076ca5ab1feb3ba95629099ec2319833701John McCall StringLiteral *AsmString = cast<StringLiteral>(asmString); 21283037ed0a27dba62e522304183718efc149e8b6d9Sebastian Redl StringLiteral **Clobbers = reinterpret_cast<StringLiteral**>(clobbers.get()); 21293037ed0a27dba62e522304183718efc149e8b6d9Sebastian Redl 21305f9e272e632e951b1efe824cd16acb4d96077930Chris Lattner SmallVector<TargetInfo::ConstraintInfo, 4> OutputConstraintInfos; 21311eb4433ac451dc16f4133a88af2d002ac26c58efMike Stump 21321708b963a014b48103e78131f960a13ee1aa6d0cChris Lattner // The parser verifies that there is a string literal here. 21335cee1195584fa8672253139c86e922daeda69b9eDouglas Gregor if (!AsmString->isAscii()) 21343037ed0a27dba62e522304183718efc149e8b6d9Sebastian Redl return StmtError(Diag(AsmString->getLocStart(),diag::err_asm_wide_character) 21353037ed0a27dba62e522304183718efc149e8b6d9Sebastian Redl << AsmString->getSourceRange()); 21363037ed0a27dba62e522304183718efc149e8b6d9Sebastian Redl 21371708b963a014b48103e78131f960a13ee1aa6d0cChris Lattner for (unsigned i = 0; i != NumOutputs; i++) { 21381708b963a014b48103e78131f960a13ee1aa6d0cChris Lattner StringLiteral *Literal = Constraints[i]; 21395cee1195584fa8672253139c86e922daeda69b9eDouglas Gregor if (!Literal->isAscii()) 21403037ed0a27dba62e522304183718efc149e8b6d9Sebastian Redl return StmtError(Diag(Literal->getLocStart(),diag::err_asm_wide_character) 21413037ed0a27dba62e522304183718efc149e8b6d9Sebastian Redl << Literal->getSourceRange()); 21423037ed0a27dba62e522304183718efc149e8b6d9Sebastian Redl 21435f9e272e632e951b1efe824cd16acb4d96077930Chris Lattner StringRef OutputName; 2144ff93dbd887e40588ed55d135037bb9287488b285Anders Carlsson if (Names[i]) 2145ff93dbd887e40588ed55d135037bb9287488b285Anders Carlsson OutputName = Names[i]->getName(); 2146ff93dbd887e40588ed55d135037bb9287488b285Anders Carlsson 2147ff93dbd887e40588ed55d135037bb9287488b285Anders Carlsson TargetInfo::ConstraintInfo Info(Literal->getString(), OutputName); 2148bcfd1f55bfbb3e5944cd5e03d07b343e280838c4Douglas Gregor if (!Context.getTargetInfo().validateOutputConstraint(Info)) 21493037ed0a27dba62e522304183718efc149e8b6d9Sebastian Redl return StmtError(Diag(Literal->getLocStart(), 2150432c86969eced2ce658b3f3f2aa7407c8864f21bChris Lattner diag::err_asm_invalid_output_constraint) 2151432c86969eced2ce658b3f3f2aa7407c8864f21bChris Lattner << Info.getConstraintStr()); 21523037ed0a27dba62e522304183718efc149e8b6d9Sebastian Redl 2153d04c6e23f2e10eeb9936778d67f4a1c4a14cc4f6Anders Carlsson // Check that the output exprs are valid lvalues. 215472056a237c536ee63285ab0850cb50f299281767Eli Friedman Expr *OutputExpr = Exprs[i]; 2155810f6d5d6223adaab0ccf0139f40de6484ad1bb5Chris Lattner if (CheckAsmLValue(OutputExpr, *this)) { 215672056a237c536ee63285ab0850cb50f299281767Eli Friedman return StmtError(Diag(OutputExpr->getLocStart(), 2157dcd5ef12488e4c7ea844327835896ca86b609a97Chris Lattner diag::err_asm_invalid_lvalue_in_output) 215872056a237c536ee63285ab0850cb50f299281767Eli Friedman << OutputExpr->getSourceRange()); 215904728b7ea928b029f165fc67d32ced40e6868b31Anders Carlsson } 21601eb4433ac451dc16f4133a88af2d002ac26c58efMike Stump 216144def070435a2b5d67f0534f7a3a85a7389d60f2Chris Lattner OutputConstraintInfos.push_back(Info); 216204728b7ea928b029f165fc67d32ced40e6868b31Anders Carlsson } 21633037ed0a27dba62e522304183718efc149e8b6d9Sebastian Redl 21645f9e272e632e951b1efe824cd16acb4d96077930Chris Lattner SmallVector<TargetInfo::ConstraintInfo, 4> InputConstraintInfos; 2165806503f8c839d7f5ebf3fbf7ee848c179be76dd2Chris Lattner 216604728b7ea928b029f165fc67d32ced40e6868b31Anders Carlsson for (unsigned i = NumOutputs, e = NumOutputs + NumInputs; i != e; i++) { 21671708b963a014b48103e78131f960a13ee1aa6d0cChris Lattner StringLiteral *Literal = Constraints[i]; 21685cee1195584fa8672253139c86e922daeda69b9eDouglas Gregor if (!Literal->isAscii()) 21693037ed0a27dba62e522304183718efc149e8b6d9Sebastian Redl return StmtError(Diag(Literal->getLocStart(),diag::err_asm_wide_character) 21703037ed0a27dba62e522304183718efc149e8b6d9Sebastian Redl << Literal->getSourceRange()); 21713037ed0a27dba62e522304183718efc149e8b6d9Sebastian Redl 21725f9e272e632e951b1efe824cd16acb4d96077930Chris Lattner StringRef InputName; 2173ff93dbd887e40588ed55d135037bb9287488b285Anders Carlsson if (Names[i]) 2174ff93dbd887e40588ed55d135037bb9287488b285Anders Carlsson InputName = Names[i]->getName(); 2175ff93dbd887e40588ed55d135037bb9287488b285Anders Carlsson 2176ff93dbd887e40588ed55d135037bb9287488b285Anders Carlsson TargetInfo::ConstraintInfo Info(Literal->getString(), InputName); 2177bcfd1f55bfbb3e5944cd5e03d07b343e280838c4Douglas Gregor if (!Context.getTargetInfo().validateInputConstraint(OutputConstraintInfos.data(), 21782819fa85651526d59ade4fdc9da2cadd7b132973Chris Lattner NumOutputs, Info)) { 21793037ed0a27dba62e522304183718efc149e8b6d9Sebastian Redl return StmtError(Diag(Literal->getLocStart(), 2180432c86969eced2ce658b3f3f2aa7407c8864f21bChris Lattner diag::err_asm_invalid_input_constraint) 2181432c86969eced2ce658b3f3f2aa7407c8864f21bChris Lattner << Info.getConstraintStr()); 2182d04c6e23f2e10eeb9936778d67f4a1c4a14cc4f6Anders Carlsson } 21833037ed0a27dba62e522304183718efc149e8b6d9Sebastian Redl 218472056a237c536ee63285ab0850cb50f299281767Eli Friedman Expr *InputExpr = Exprs[i]; 21853037ed0a27dba62e522304183718efc149e8b6d9Sebastian Redl 2186d9fca6e3950346ea503f92f27ed0f9d8edde9febAnders Carlsson // Only allow void types for memory constraints. 218744def070435a2b5d67f0534f7a3a85a7389d60f2Chris Lattner if (Info.allowsMemory() && !Info.allowsRegister()) { 2188810f6d5d6223adaab0ccf0139f40de6484ad1bb5Chris Lattner if (CheckAsmLValue(InputExpr, *this)) 218972056a237c536ee63285ab0850cb50f299281767Eli Friedman return StmtError(Diag(InputExpr->getLocStart(), 2190d9fca6e3950346ea503f92f27ed0f9d8edde9febAnders Carlsson diag::err_asm_invalid_lvalue_in_input) 2191432c86969eced2ce658b3f3f2aa7407c8864f21bChris Lattner << Info.getConstraintStr() 219272056a237c536ee63285ab0850cb50f299281767Eli Friedman << InputExpr->getSourceRange()); 219304728b7ea928b029f165fc67d32ced40e6868b31Anders Carlsson } 21943037ed0a27dba62e522304183718efc149e8b6d9Sebastian Redl 219544def070435a2b5d67f0534f7a3a85a7389d60f2Chris Lattner if (Info.allowsRegister()) { 2196d9fca6e3950346ea503f92f27ed0f9d8edde9febAnders Carlsson if (InputExpr->getType()->isVoidType()) { 219772056a237c536ee63285ab0850cb50f299281767Eli Friedman return StmtError(Diag(InputExpr->getLocStart(), 2198d9fca6e3950346ea503f92f27ed0f9d8edde9febAnders Carlsson diag::err_asm_invalid_type_in_input) 21991eb4433ac451dc16f4133a88af2d002ac26c58efMike Stump << InputExpr->getType() << Info.getConstraintStr() 220072056a237c536ee63285ab0850cb50f299281767Eli Friedman << InputExpr->getSourceRange()); 2201d9fca6e3950346ea503f92f27ed0f9d8edde9febAnders Carlsson } 2202d9fca6e3950346ea503f92f27ed0f9d8edde9febAnders Carlsson } 22031eb4433ac451dc16f4133a88af2d002ac26c58efMike Stump 2204429bb276991ff2dbc7c5b438828b9b7737cb15ebJohn Wiegley ExprResult Result = DefaultFunctionArrayLvalueConversion(Exprs[i]); 2205429bb276991ff2dbc7c5b438828b9b7737cb15ebJohn Wiegley if (Result.isInvalid()) 2206429bb276991ff2dbc7c5b438828b9b7737cb15ebJohn Wiegley return StmtError(); 22071eb4433ac451dc16f4133a88af2d002ac26c58efMike Stump 2208429bb276991ff2dbc7c5b438828b9b7737cb15ebJohn Wiegley Exprs[i] = Result.take(); 2209806503f8c839d7f5ebf3fbf7ee848c179be76dd2Chris Lattner InputConstraintInfos.push_back(Info); 221004728b7ea928b029f165fc67d32ced40e6868b31Anders Carlsson } 22113037ed0a27dba62e522304183718efc149e8b6d9Sebastian Redl 22126fa9086043b0338d895a4cdb0ec8542530af90d7Anders Carlsson // Check that the clobbers are valid. 22131708b963a014b48103e78131f960a13ee1aa6d0cChris Lattner for (unsigned i = 0; i != NumClobbers; i++) { 22141708b963a014b48103e78131f960a13ee1aa6d0cChris Lattner StringLiteral *Literal = Clobbers[i]; 22155cee1195584fa8672253139c86e922daeda69b9eDouglas Gregor if (!Literal->isAscii()) 22163037ed0a27dba62e522304183718efc149e8b6d9Sebastian Redl return StmtError(Diag(Literal->getLocStart(),diag::err_asm_wide_character) 22173037ed0a27dba62e522304183718efc149e8b6d9Sebastian Redl << Literal->getSourceRange()); 22183037ed0a27dba62e522304183718efc149e8b6d9Sebastian Redl 22195f9e272e632e951b1efe824cd16acb4d96077930Chris Lattner StringRef Clobber = Literal->getString(); 22203037ed0a27dba62e522304183718efc149e8b6d9Sebastian Redl 2221bcfd1f55bfbb3e5944cd5e03d07b343e280838c4Douglas Gregor if (!Context.getTargetInfo().isValidClobber(Clobber)) 22223037ed0a27dba62e522304183718efc149e8b6d9Sebastian Redl return StmtError(Diag(Literal->getLocStart(), 22237765934ad7e157b5fcf925792a38e01b1edbcf8aDaniel Dunbar diag::err_asm_unknown_register_name) << Clobber); 22246fa9086043b0338d895a4cdb0ec8542530af90d7Anders Carlsson } 22253037ed0a27dba62e522304183718efc149e8b6d9Sebastian Redl 2226fb5058ef67c054296c88db18ab1b3717845cb71dChris Lattner AsmStmt *NS = 2227dfbb02a16ac8c764b5ba1742450513d6212d2f9fNAKAMURA Takumi new (Context) AsmStmt(Context, AsmLoc, IsSimple, IsVolatile, MSAsm, 2228dfbb02a16ac8c764b5ba1742450513d6212d2f9fNAKAMURA Takumi NumOutputs, NumInputs, Names, Constraints, Exprs, 2229966146e89141804ff6492739a2a6e6592ca671c7Anders Carlsson AsmString, NumClobbers, Clobbers, RParenLoc); 2230fb5058ef67c054296c88db18ab1b3717845cb71dChris Lattner // Validate the asm string, ensuring it makes sense given the operands we 2231fb5058ef67c054296c88db18ab1b3717845cb71dChris Lattner // have. 22325f9e272e632e951b1efe824cd16acb4d96077930Chris Lattner SmallVector<AsmStmt::AsmStringPiece, 8> Pieces; 2233fb5058ef67c054296c88db18ab1b3717845cb71dChris Lattner unsigned DiagOffs; 2234fb5058ef67c054296c88db18ab1b3717845cb71dChris Lattner if (unsigned DiagID = NS->AnalyzeAsmString(Pieces, Context, DiagOffs)) { 22352ff0f42a962fec5a6300b5986297b417db173e6aChris Lattner Diag(getLocationOfStringLiteralByte(AsmString, DiagOffs), DiagID) 22362ff0f42a962fec5a6300b5986297b417db173e6aChris Lattner << AsmString->getSourceRange(); 2237fb5058ef67c054296c88db18ab1b3717845cb71dChris Lattner return StmtError(); 2238fb5058ef67c054296c88db18ab1b3717845cb71dChris Lattner } 22391eb4433ac451dc16f4133a88af2d002ac26c58efMike Stump 2240806503f8c839d7f5ebf3fbf7ee848c179be76dd2Chris Lattner // Validate tied input operands for type mismatches. 2241806503f8c839d7f5ebf3fbf7ee848c179be76dd2Chris Lattner for (unsigned i = 0, e = InputConstraintInfos.size(); i != e; ++i) { 2242806503f8c839d7f5ebf3fbf7ee848c179be76dd2Chris Lattner TargetInfo::ConstraintInfo &Info = InputConstraintInfos[i]; 22431eb4433ac451dc16f4133a88af2d002ac26c58efMike Stump 2244806503f8c839d7f5ebf3fbf7ee848c179be76dd2Chris Lattner // If this is a tied constraint, verify that the output and input have 2245806503f8c839d7f5ebf3fbf7ee848c179be76dd2Chris Lattner // either exactly the same type, or that they are int/ptr operands with the 2246806503f8c839d7f5ebf3fbf7ee848c179be76dd2Chris Lattner // same size (int/long, int*/long, are ok etc). 2247806503f8c839d7f5ebf3fbf7ee848c179be76dd2Chris Lattner if (!Info.hasTiedOperand()) continue; 22481eb4433ac451dc16f4133a88af2d002ac26c58efMike Stump 2249806503f8c839d7f5ebf3fbf7ee848c179be76dd2Chris Lattner unsigned TiedTo = Info.getTiedOperand(); 2250935f0f01c1ed3c2052b797ac035d57a85b78adc4Chris Lattner unsigned InputOpNo = i+NumOutputs; 2251f69fcaeb3843297757251a19f0a6f5bbffed7f32Chris Lattner Expr *OutputExpr = Exprs[TiedTo]; 2252935f0f01c1ed3c2052b797ac035d57a85b78adc4Chris Lattner Expr *InputExpr = Exprs[InputOpNo]; 2253f45b357c0d0df99e160a6320e279ef788dd91ba6Eli Friedman 2254f45b357c0d0df99e160a6320e279ef788dd91ba6Eli Friedman if (OutputExpr->isTypeDependent() || InputExpr->isTypeDependent()) 2255f45b357c0d0df99e160a6320e279ef788dd91ba6Eli Friedman continue; 2256f45b357c0d0df99e160a6320e279ef788dd91ba6Eli Friedman 22577adaa18ef3be65971cd41cc61dd739baeb02af10Chris Lattner QualType InTy = InputExpr->getType(); 22587adaa18ef3be65971cd41cc61dd739baeb02af10Chris Lattner QualType OutTy = OutputExpr->getType(); 22597adaa18ef3be65971cd41cc61dd739baeb02af10Chris Lattner if (Context.hasSameType(InTy, OutTy)) 2260806503f8c839d7f5ebf3fbf7ee848c179be76dd2Chris Lattner continue; // All types can be tied to themselves. 22611eb4433ac451dc16f4133a88af2d002ac26c58efMike Stump 2262aab64d0b7f41ed30b15ba9210ed859424cbc7455Chris Lattner // Decide if the input and output are in the same domain (integer/ptr or 2263aab64d0b7f41ed30b15ba9210ed859424cbc7455Chris Lattner // floating point. 2264aab64d0b7f41ed30b15ba9210ed859424cbc7455Chris Lattner enum AsmDomain { 2265aab64d0b7f41ed30b15ba9210ed859424cbc7455Chris Lattner AD_Int, AD_FP, AD_Other 2266aab64d0b7f41ed30b15ba9210ed859424cbc7455Chris Lattner } InputDomain, OutputDomain; 2267dfbb02a16ac8c764b5ba1742450513d6212d2f9fNAKAMURA Takumi 2268aab64d0b7f41ed30b15ba9210ed859424cbc7455Chris Lattner if (InTy->isIntegerType() || InTy->isPointerType()) 2269aab64d0b7f41ed30b15ba9210ed859424cbc7455Chris Lattner InputDomain = AD_Int; 22700c293ea13d452c1a47a05ada5a5ee9acc69c66ccDouglas Gregor else if (InTy->isRealFloatingType()) 2271aab64d0b7f41ed30b15ba9210ed859424cbc7455Chris Lattner InputDomain = AD_FP; 2272aab64d0b7f41ed30b15ba9210ed859424cbc7455Chris Lattner else 2273aab64d0b7f41ed30b15ba9210ed859424cbc7455Chris Lattner InputDomain = AD_Other; 22743351f1145aa91ddd8022fcd3ca16c219db9e8277Chris Lattner 2275aab64d0b7f41ed30b15ba9210ed859424cbc7455Chris Lattner if (OutTy->isIntegerType() || OutTy->isPointerType()) 2276aab64d0b7f41ed30b15ba9210ed859424cbc7455Chris Lattner OutputDomain = AD_Int; 22770c293ea13d452c1a47a05ada5a5ee9acc69c66ccDouglas Gregor else if (OutTy->isRealFloatingType()) 2278aab64d0b7f41ed30b15ba9210ed859424cbc7455Chris Lattner OutputDomain = AD_FP; 2279aab64d0b7f41ed30b15ba9210ed859424cbc7455Chris Lattner else 2280aab64d0b7f41ed30b15ba9210ed859424cbc7455Chris Lattner OutputDomain = AD_Other; 2281dfbb02a16ac8c764b5ba1742450513d6212d2f9fNAKAMURA Takumi 2282aab64d0b7f41ed30b15ba9210ed859424cbc7455Chris Lattner // They are ok if they are the same size and in the same domain. This 2283aab64d0b7f41ed30b15ba9210ed859424cbc7455Chris Lattner // allows tying things like: 2284aab64d0b7f41ed30b15ba9210ed859424cbc7455Chris Lattner // void* to int* 2285aab64d0b7f41ed30b15ba9210ed859424cbc7455Chris Lattner // void* to int if they are the same size. 2286aab64d0b7f41ed30b15ba9210ed859424cbc7455Chris Lattner // double to long double if they are the same size. 2287dfbb02a16ac8c764b5ba1742450513d6212d2f9fNAKAMURA Takumi // 2288aab64d0b7f41ed30b15ba9210ed859424cbc7455Chris Lattner uint64_t OutSize = Context.getTypeSize(OutTy); 2289aab64d0b7f41ed30b15ba9210ed859424cbc7455Chris Lattner uint64_t InSize = Context.getTypeSize(InTy); 2290aab64d0b7f41ed30b15ba9210ed859424cbc7455Chris Lattner if (OutSize == InSize && InputDomain == OutputDomain && 2291aab64d0b7f41ed30b15ba9210ed859424cbc7455Chris Lattner InputDomain != AD_Other) 2292aab64d0b7f41ed30b15ba9210ed859424cbc7455Chris Lattner continue; 2293dfbb02a16ac8c764b5ba1742450513d6212d2f9fNAKAMURA Takumi 2294aab64d0b7f41ed30b15ba9210ed859424cbc7455Chris Lattner // If the smaller input/output operand is not mentioned in the asm string, 2295f0c4d28020fb13fdbf7d6fccfab1b7b6a118ad0eChris Lattner // then we can promote the smaller one to a larger input and the asm string 2296f0c4d28020fb13fdbf7d6fccfab1b7b6a118ad0eChris Lattner // won't notice. 2297aab64d0b7f41ed30b15ba9210ed859424cbc7455Chris Lattner bool SmallerValueMentioned = false; 2298ca57b4b7658a031b74cda5ac504311998be8e343Chris Lattner 2299ca57b4b7658a031b74cda5ac504311998be8e343Chris Lattner // If this is a reference to the input and if the input was the smaller 2300ca57b4b7658a031b74cda5ac504311998be8e343Chris Lattner // one, then we have to reject this asm. 2301935f0f01c1ed3c2052b797ac035d57a85b78adc4Chris Lattner if (isOperandMentioned(InputOpNo, Pieces)) { 2302ca57b4b7658a031b74cda5ac504311998be8e343Chris Lattner // This is a use in the asm string of the smaller operand. Since we 2303ca57b4b7658a031b74cda5ac504311998be8e343Chris Lattner // codegen this by promoting to a wider value, the asm will get printed 2304ca57b4b7658a031b74cda5ac504311998be8e343Chris Lattner // "wrong". 2305f0c4d28020fb13fdbf7d6fccfab1b7b6a118ad0eChris Lattner SmallerValueMentioned |= InSize < OutSize; 2306ca57b4b7658a031b74cda5ac504311998be8e343Chris Lattner } 2307f0c4d28020fb13fdbf7d6fccfab1b7b6a118ad0eChris Lattner if (isOperandMentioned(TiedTo, Pieces)) { 2308ca57b4b7658a031b74cda5ac504311998be8e343Chris Lattner // If this is a reference to the output, and if the output is the larger 2309ca57b4b7658a031b74cda5ac504311998be8e343Chris Lattner // value, then it's ok because we'll promote the input to the larger type. 2310f0c4d28020fb13fdbf7d6fccfab1b7b6a118ad0eChris Lattner SmallerValueMentioned |= OutSize < InSize; 2311806503f8c839d7f5ebf3fbf7ee848c179be76dd2Chris Lattner } 23121eb4433ac451dc16f4133a88af2d002ac26c58efMike Stump 2313aab64d0b7f41ed30b15ba9210ed859424cbc7455Chris Lattner // If the smaller value wasn't mentioned in the asm string, and if the 2314aab64d0b7f41ed30b15ba9210ed859424cbc7455Chris Lattner // output was a register, just extend the shorter one to the size of the 2315aab64d0b7f41ed30b15ba9210ed859424cbc7455Chris Lattner // larger one. 2316aab64d0b7f41ed30b15ba9210ed859424cbc7455Chris Lattner if (!SmallerValueMentioned && InputDomain != AD_Other && 2317aab64d0b7f41ed30b15ba9210ed859424cbc7455Chris Lattner OutputConstraintInfos[TiedTo].allowsRegister()) 2318aab64d0b7f41ed30b15ba9210ed859424cbc7455Chris Lattner continue; 2319f0c4d28020fb13fdbf7d6fccfab1b7b6a118ad0eChris Lattner 2320935f0f01c1ed3c2052b797ac035d57a85b78adc4Chris Lattner // Either both of the operands were mentioned or the smaller one was 2321935f0f01c1ed3c2052b797ac035d57a85b78adc4Chris Lattner // mentioned. One more special case that we'll allow: if the tied input is 2322935f0f01c1ed3c2052b797ac035d57a85b78adc4Chris Lattner // integer, unmentioned, and is a constant, then we'll allow truncating it 2323935f0f01c1ed3c2052b797ac035d57a85b78adc4Chris Lattner // down to the size of the destination. 2324935f0f01c1ed3c2052b797ac035d57a85b78adc4Chris Lattner if (InputDomain == AD_Int && OutputDomain == AD_Int && 2325935f0f01c1ed3c2052b797ac035d57a85b78adc4Chris Lattner !isOperandMentioned(InputOpNo, Pieces) && 2326935f0f01c1ed3c2052b797ac035d57a85b78adc4Chris Lattner InputExpr->isEvaluatable(Context)) { 23274da89c87b2b6ca31f1015ec19aae65a02971ea9aJohn McCall CastKind castKind = 23284da89c87b2b6ca31f1015ec19aae65a02971ea9aJohn McCall (OutTy->isBooleanType() ? CK_IntegralToBoolean : CK_IntegralCast); 23294da89c87b2b6ca31f1015ec19aae65a02971ea9aJohn McCall InputExpr = ImpCastExprToType(InputExpr, OutTy, castKind).take(); 2330935f0f01c1ed3c2052b797ac035d57a85b78adc4Chris Lattner Exprs[InputOpNo] = InputExpr; 2331935f0f01c1ed3c2052b797ac035d57a85b78adc4Chris Lattner NS->setInputExpr(i, InputExpr); 2332935f0f01c1ed3c2052b797ac035d57a85b78adc4Chris Lattner continue; 2333935f0f01c1ed3c2052b797ac035d57a85b78adc4Chris Lattner } 2334935f0f01c1ed3c2052b797ac035d57a85b78adc4Chris Lattner 2335c1f3b28004a032f4cd13721d4d884c6dcec29c31Chris Lattner Diag(InputExpr->getLocStart(), 2336806503f8c839d7f5ebf3fbf7ee848c179be76dd2Chris Lattner diag::err_asm_tying_incompatible_types) 23377adaa18ef3be65971cd41cc61dd739baeb02af10Chris Lattner << InTy << OutTy << OutputExpr->getSourceRange() 2338806503f8c839d7f5ebf3fbf7ee848c179be76dd2Chris Lattner << InputExpr->getSourceRange(); 2339806503f8c839d7f5ebf3fbf7ee848c179be76dd2Chris Lattner return StmtError(); 2340806503f8c839d7f5ebf3fbf7ee848c179be76dd2Chris Lattner } 23411eb4433ac451dc16f4133a88af2d002ac26c58efMike Stump 2342fb5058ef67c054296c88db18ab1b3717845cb71dChris Lattner return Owned(NS); 2343fe795956194141c91ae555985c9b930595bff43fChris Lattner} 23443b1191d7eaf2f4984564e01ab84b6713a9d80e70Fariborz Jahanian 234560d7b3a319d84d688752be3870615ac0f111fb16John McCallStmtResult 2346431e90e887c21c0d0d56fc12a2d359df8d53ea66Sebastian RedlSema::ActOnObjCAtCatchStmt(SourceLocation AtLoc, 2347d226f65006733ed7f709c3174f22ce33391cb58fJohn McCall SourceLocation RParen, Decl *Parm, 23489ae2f076ca5ab1feb3ba95629099ec2319833701John McCall Stmt *Body) { 2349d226f65006733ed7f709c3174f22ce33391cb58fJohn McCall VarDecl *Var = cast_or_null<VarDecl>(Parm); 2350160b5630aa781ac348303e1ae088d27016637778Douglas Gregor if (Var && Var->isInvalidDecl()) 2351160b5630aa781ac348303e1ae088d27016637778Douglas Gregor return StmtError(); 2352dfbb02a16ac8c764b5ba1742450513d6212d2f9fNAKAMURA Takumi 23539ae2f076ca5ab1feb3ba95629099ec2319833701John McCall return Owned(new (Context) ObjCAtCatchStmt(AtLoc, RParen, Var, Body)); 23543b1191d7eaf2f4984564e01ab84b6713a9d80e70Fariborz Jahanian} 23553b1191d7eaf2f4984564e01ab84b6713a9d80e70Fariborz Jahanian 235660d7b3a319d84d688752be3870615ac0f111fb16John McCallStmtResult 23579ae2f076ca5ab1feb3ba95629099ec2319833701John McCallSema::ActOnObjCAtFinallyStmt(SourceLocation AtLoc, Stmt *Body) { 23589ae2f076ca5ab1feb3ba95629099ec2319833701John McCall return Owned(new (Context) ObjCAtFinallyStmt(AtLoc, Body)); 2359161a9c5afaafb4d527b7efba9675a8b2cbbe32e0Fariborz Jahanian} 2360bd49a647afd9cc534fef13cadf652d4e9c396e2bFariborz Jahanian 236160d7b3a319d84d688752be3870615ac0f111fb16John McCallStmtResult 2362dfbb02a16ac8c764b5ba1742450513d6212d2f9fNAKAMURA TakumiSema::ActOnObjCAtTryStmt(SourceLocation AtLoc, Stmt *Try, 23639ae2f076ca5ab1feb3ba95629099ec2319833701John McCall MultiStmtArg CatchStmts, Stmt *Finally) { 2364da4b7cf09ebfd4e4098b516081fa9dae2f5c99e0Anders Carlsson if (!getLangOptions().ObjCExceptions) 2365da4b7cf09ebfd4e4098b516081fa9dae2f5c99e0Anders Carlsson Diag(AtLoc, diag::err_objc_exceptions_disabled) << "@try"; 2366da4b7cf09ebfd4e4098b516081fa9dae2f5c99e0Anders Carlsson 2367781472fe99a120098c631b0cbe33c89f8cef5e70John McCall getCurFunction()->setHasBranchProtectedScope(); 23688f5e3dd32e443768d9dbbad7191e123e6733750cDouglas Gregor unsigned NumCatchStmts = CatchStmts.size(); 23699ae2f076ca5ab1feb3ba95629099ec2319833701John McCall return Owned(ObjCAtTryStmt::Create(Context, AtLoc, Try, 23709ae2f076ca5ab1feb3ba95629099ec2319833701John McCall CatchStmts.release(), 23718f5e3dd32e443768d9dbbad7191e123e6733750cDouglas Gregor NumCatchStmts, 23729ae2f076ca5ab1feb3ba95629099ec2319833701John McCall Finally)); 2373bd49a647afd9cc534fef13cadf652d4e9c396e2bFariborz Jahanian} 2374bd49a647afd9cc534fef13cadf652d4e9c396e2bFariborz Jahanian 237560d7b3a319d84d688752be3870615ac0f111fb16John McCallStmtResult Sema::BuildObjCAtThrowStmt(SourceLocation AtLoc, 23769ae2f076ca5ab1feb3ba95629099ec2319833701John McCall Expr *Throw) { 2377d1377b25a36adfe6604f78cbd3a23a07cf0f29e6Douglas Gregor if (Throw) { 2378f2dd68fb37a62571a4985c8dd05310ac90d07ef0Fariborz Jahanian Throw = MaybeCreateExprWithCleanups(Throw); 2379429bb276991ff2dbc7c5b438828b9b7737cb15ebJohn Wiegley ExprResult Result = DefaultLvalueConversion(Throw); 2380429bb276991ff2dbc7c5b438828b9b7737cb15ebJohn Wiegley if (Result.isInvalid()) 2381429bb276991ff2dbc7c5b438828b9b7737cb15ebJohn Wiegley return StmtError(); 23825e3c67b4bd894a926282d24b4d0cbc0e123c9f4aJohn McCall 2383429bb276991ff2dbc7c5b438828b9b7737cb15ebJohn Wiegley Throw = Result.take(); 2384d1377b25a36adfe6604f78cbd3a23a07cf0f29e6Douglas Gregor QualType ThrowType = Throw->getType(); 2385d1377b25a36adfe6604f78cbd3a23a07cf0f29e6Douglas Gregor // Make sure the expression type is an ObjC pointer or "void *". 2386d1377b25a36adfe6604f78cbd3a23a07cf0f29e6Douglas Gregor if (!ThrowType->isDependentType() && 2387d1377b25a36adfe6604f78cbd3a23a07cf0f29e6Douglas Gregor !ThrowType->isObjCObjectPointerType()) { 2388d1377b25a36adfe6604f78cbd3a23a07cf0f29e6Douglas Gregor const PointerType *PT = ThrowType->getAs<PointerType>(); 2389d1377b25a36adfe6604f78cbd3a23a07cf0f29e6Douglas Gregor if (!PT || !PT->getPointeeType()->isVoidType()) 2390d1377b25a36adfe6604f78cbd3a23a07cf0f29e6Douglas Gregor return StmtError(Diag(AtLoc, diag::error_objc_throw_expects_object) 2391d1377b25a36adfe6604f78cbd3a23a07cf0f29e6Douglas Gregor << Throw->getType() << Throw->getSourceRange()); 2392d1377b25a36adfe6604f78cbd3a23a07cf0f29e6Douglas Gregor } 2393d1377b25a36adfe6604f78cbd3a23a07cf0f29e6Douglas Gregor } 2394dfbb02a16ac8c764b5ba1742450513d6212d2f9fNAKAMURA Takumi 23959ae2f076ca5ab1feb3ba95629099ec2319833701John McCall return Owned(new (Context) ObjCAtThrowStmt(AtLoc, Throw)); 2396d1377b25a36adfe6604f78cbd3a23a07cf0f29e6Douglas Gregor} 2397d1377b25a36adfe6604f78cbd3a23a07cf0f29e6Douglas Gregor 239860d7b3a319d84d688752be3870615ac0f111fb16John McCallStmtResult 2399dfbb02a16ac8c764b5ba1742450513d6212d2f9fNAKAMURA TakumiSema::ActOnObjCAtThrowStmt(SourceLocation AtLoc, Expr *Throw, 2400d1377b25a36adfe6604f78cbd3a23a07cf0f29e6Douglas Gregor Scope *CurScope) { 2401da4b7cf09ebfd4e4098b516081fa9dae2f5c99e0Anders Carlsson if (!getLangOptions().ObjCExceptions) 2402da4b7cf09ebfd4e4098b516081fa9dae2f5c99e0Anders Carlsson Diag(AtLoc, diag::err_objc_exceptions_disabled) << "@throw"; 2403da4b7cf09ebfd4e4098b516081fa9dae2f5c99e0Anders Carlsson 24049ae2f076ca5ab1feb3ba95629099ec2319833701John McCall if (!Throw) { 2405e21dd6ffef4585fa43cd3586ed971217d65bf56cSteve Naroff // @throw without an expression designates a rethrow (which much occur 2406e21dd6ffef4585fa43cd3586ed971217d65bf56cSteve Naroff // in the context of an @catch clause). 2407e21dd6ffef4585fa43cd3586ed971217d65bf56cSteve Naroff Scope *AtCatchParent = CurScope; 2408e21dd6ffef4585fa43cd3586ed971217d65bf56cSteve Naroff while (AtCatchParent && !AtCatchParent->isAtCatchScope()) 2409e21dd6ffef4585fa43cd3586ed971217d65bf56cSteve Naroff AtCatchParent = AtCatchParent->getParent(); 2410e21dd6ffef4585fa43cd3586ed971217d65bf56cSteve Naroff if (!AtCatchParent) 24114ab2414f297fab1b290e77bfc3b049ccf45eda81Steve Naroff return StmtError(Diag(AtLoc, diag::error_rethrow_used_outside_catch)); 2412dfbb02a16ac8c764b5ba1742450513d6212d2f9fNAKAMURA Takumi } 2413f2dd68fb37a62571a4985c8dd05310ac90d07ef0Fariborz Jahanian 24149ae2f076ca5ab1feb3ba95629099ec2319833701John McCall return BuildObjCAtThrowStmt(AtLoc, Throw); 241539f8f159c488a900e5958d5aab3e467af9ec8a2bFariborz Jahanian} 2416bd49a647afd9cc534fef13cadf652d4e9c396e2bFariborz Jahanian 241707524039dce5c820f111a1b3f772b4261f004b4aJohn McCallExprResult 241807524039dce5c820f111a1b3f772b4261f004b4aJohn McCallSema::ActOnObjCAtSynchronizedOperand(SourceLocation atLoc, Expr *operand) { 241907524039dce5c820f111a1b3f772b4261f004b4aJohn McCall ExprResult result = DefaultLvalueConversion(operand); 242007524039dce5c820f111a1b3f772b4261f004b4aJohn McCall if (result.isInvalid()) 242107524039dce5c820f111a1b3f772b4261f004b4aJohn McCall return ExprError(); 242207524039dce5c820f111a1b3f772b4261f004b4aJohn McCall operand = result.take(); 24235e3c67b4bd894a926282d24b4d0cbc0e123c9f4aJohn McCall 2424a868a203a18571d091e5d226f5f100d4440f3d94Chris Lattner // Make sure the expression type is an ObjC pointer or "void *". 242507524039dce5c820f111a1b3f772b4261f004b4aJohn McCall QualType type = operand->getType(); 242607524039dce5c820f111a1b3f772b4261f004b4aJohn McCall if (!type->isDependentType() && 242707524039dce5c820f111a1b3f772b4261f004b4aJohn McCall !type->isObjCObjectPointerType()) { 242807524039dce5c820f111a1b3f772b4261f004b4aJohn McCall const PointerType *pointerType = type->getAs<PointerType>(); 242907524039dce5c820f111a1b3f772b4261f004b4aJohn McCall if (!pointerType || !pointerType->getPointeeType()->isVoidType()) 243007524039dce5c820f111a1b3f772b4261f004b4aJohn McCall return Diag(atLoc, diag::error_objc_synchronized_expects_object) 243107524039dce5c820f111a1b3f772b4261f004b4aJohn McCall << type << operand->getSourceRange(); 2432a868a203a18571d091e5d226f5f100d4440f3d94Chris Lattner } 24331eb4433ac451dc16f4133a88af2d002ac26c58efMike Stump 243407524039dce5c820f111a1b3f772b4261f004b4aJohn McCall // The operand to @synchronized is a full-expression. 243507524039dce5c820f111a1b3f772b4261f004b4aJohn McCall return MaybeCreateExprWithCleanups(operand); 243607524039dce5c820f111a1b3f772b4261f004b4aJohn McCall} 243707524039dce5c820f111a1b3f772b4261f004b4aJohn McCall 243807524039dce5c820f111a1b3f772b4261f004b4aJohn McCallStmtResult 243907524039dce5c820f111a1b3f772b4261f004b4aJohn McCallSema::ActOnObjCAtSynchronizedStmt(SourceLocation AtLoc, Expr *SyncExpr, 244007524039dce5c820f111a1b3f772b4261f004b4aJohn McCall Stmt *SyncBody) { 244107524039dce5c820f111a1b3f772b4261f004b4aJohn McCall // We can't jump into or indirect-jump out of a @synchronized block. 244207524039dce5c820f111a1b3f772b4261f004b4aJohn McCall getCurFunction()->setHasBranchProtectedScope(); 24439ae2f076ca5ab1feb3ba95629099ec2319833701John McCall return Owned(new (Context) ObjCAtSynchronizedStmt(AtLoc, SyncExpr, SyncBody)); 2444fa3ee8e6776634caf064ba5928ca7699d317a280Fariborz Jahanian} 24454b07b2968f87f3cd5a3d8c76145f1cbfd718d42dSebastian Redl 24464b07b2968f87f3cd5a3d8c76145f1cbfd718d42dSebastian Redl/// ActOnCXXCatchBlock - Takes an exception declaration and a handler block 24474b07b2968f87f3cd5a3d8c76145f1cbfd718d42dSebastian Redl/// and creates a proper catch handler from them. 244860d7b3a319d84d688752be3870615ac0f111fb16John McCallStmtResult 2449d226f65006733ed7f709c3174f22ce33391cb58fJohn McCallSema::ActOnCXXCatchBlock(SourceLocation CatchLoc, Decl *ExDecl, 24509ae2f076ca5ab1feb3ba95629099ec2319833701John McCall Stmt *HandlerBlock) { 24514b07b2968f87f3cd5a3d8c76145f1cbfd718d42dSebastian Redl // There's nothing to test that ActOnExceptionDecl didn't already test. 24528189cde56b4f6f938cd65f53c932fe1860d0204cTed Kremenek return Owned(new (Context) CXXCatchStmt(CatchLoc, 2453d226f65006733ed7f709c3174f22ce33391cb58fJohn McCall cast_or_null<VarDecl>(ExDecl), 24549ae2f076ca5ab1feb3ba95629099ec2319833701John McCall HandlerBlock)); 24554b07b2968f87f3cd5a3d8c76145f1cbfd718d42dSebastian Redl} 24568351da06ca3082dfd49dd8e3c1785a986920f57cSebastian Redl 2457f85e193739c953358c865005855253af4f68a497John McCallStmtResult 2458f85e193739c953358c865005855253af4f68a497John McCallSema::ActOnObjCAutoreleasePoolStmt(SourceLocation AtLoc, Stmt *Body) { 2459f85e193739c953358c865005855253af4f68a497John McCall getCurFunction()->setHasBranchProtectedScope(); 2460f85e193739c953358c865005855253af4f68a497John McCall return Owned(new (Context) ObjCAutoreleasePoolStmt(AtLoc, Body)); 2461f85e193739c953358c865005855253af4f68a497John McCall} 2462f85e193739c953358c865005855253af4f68a497John McCall 24633c46e8db99196179b30e7ac5c20c4efd5f3926d7Dan Gohmannamespace { 24643c46e8db99196179b30e7ac5c20c4efd5f3926d7Dan Gohman 2465c447aba04527a71d254b151f79f444d1cbe83ce9Sebastian Redlclass TypeWithHandler { 2466c447aba04527a71d254b151f79f444d1cbe83ce9Sebastian Redl QualType t; 2467c447aba04527a71d254b151f79f444d1cbe83ce9Sebastian Redl CXXCatchStmt *stmt; 2468c447aba04527a71d254b151f79f444d1cbe83ce9Sebastian Redlpublic: 2469c447aba04527a71d254b151f79f444d1cbe83ce9Sebastian Redl TypeWithHandler(const QualType &type, CXXCatchStmt *statement) 2470c447aba04527a71d254b151f79f444d1cbe83ce9Sebastian Redl : t(type), stmt(statement) {} 2471c447aba04527a71d254b151f79f444d1cbe83ce9Sebastian Redl 24720953e767ff7817f97b3ab20896b229891eeff45bJohn McCall // An arbitrary order is fine as long as it places identical 24730953e767ff7817f97b3ab20896b229891eeff45bJohn McCall // types next to each other. 2474c447aba04527a71d254b151f79f444d1cbe83ce9Sebastian Redl bool operator<(const TypeWithHandler &y) const { 24750953e767ff7817f97b3ab20896b229891eeff45bJohn McCall if (t.getAsOpaquePtr() < y.t.getAsOpaquePtr()) 2476c447aba04527a71d254b151f79f444d1cbe83ce9Sebastian Redl return true; 24770953e767ff7817f97b3ab20896b229891eeff45bJohn McCall if (t.getAsOpaquePtr() > y.t.getAsOpaquePtr()) 2478c447aba04527a71d254b151f79f444d1cbe83ce9Sebastian Redl return false; 2479c447aba04527a71d254b151f79f444d1cbe83ce9Sebastian Redl else 2480c447aba04527a71d254b151f79f444d1cbe83ce9Sebastian Redl return getTypeSpecStartLoc() < y.getTypeSpecStartLoc(); 2481c447aba04527a71d254b151f79f444d1cbe83ce9Sebastian Redl } 24821eb4433ac451dc16f4133a88af2d002ac26c58efMike Stump 2483c447aba04527a71d254b151f79f444d1cbe83ce9Sebastian Redl bool operator==(const TypeWithHandler& other) const { 24840953e767ff7817f97b3ab20896b229891eeff45bJohn McCall return t == other.t; 2485c447aba04527a71d254b151f79f444d1cbe83ce9Sebastian Redl } 24861eb4433ac451dc16f4133a88af2d002ac26c58efMike Stump 2487c447aba04527a71d254b151f79f444d1cbe83ce9Sebastian Redl CXXCatchStmt *getCatchStmt() const { return stmt; } 2488c447aba04527a71d254b151f79f444d1cbe83ce9Sebastian Redl SourceLocation getTypeSpecStartLoc() const { 2489c447aba04527a71d254b151f79f444d1cbe83ce9Sebastian Redl return stmt->getExceptionDecl()->getTypeSpecStartLoc(); 2490c447aba04527a71d254b151f79f444d1cbe83ce9Sebastian Redl } 2491c447aba04527a71d254b151f79f444d1cbe83ce9Sebastian Redl}; 2492c447aba04527a71d254b151f79f444d1cbe83ce9Sebastian Redl 24933c46e8db99196179b30e7ac5c20c4efd5f3926d7Dan Gohman} 24943c46e8db99196179b30e7ac5c20c4efd5f3926d7Dan Gohman 24958351da06ca3082dfd49dd8e3c1785a986920f57cSebastian Redl/// ActOnCXXTryBlock - Takes a try compound-statement and a number of 24968351da06ca3082dfd49dd8e3c1785a986920f57cSebastian Redl/// handlers and creates a try statement from them. 249760d7b3a319d84d688752be3870615ac0f111fb16John McCallStmtResult 24989ae2f076ca5ab1feb3ba95629099ec2319833701John McCallSema::ActOnCXXTryBlock(SourceLocation TryLoc, Stmt *TryBlock, 24998351da06ca3082dfd49dd8e3c1785a986920f57cSebastian Redl MultiStmtArg RawHandlers) { 2500729b853f4bfa83e53c638a06a9dccf83b4e1f720Anders Carlsson // Don't report an error if 'try' is used in system headers. 250115348aeb81285c75b2e92b5bf8d2db3445d147c2Anders Carlsson if (!getLangOptions().CXXExceptions && 2502729b853f4bfa83e53c638a06a9dccf83b4e1f720Anders Carlsson !getSourceManager().isInSystemHeader(TryLoc)) 2503729b853f4bfa83e53c638a06a9dccf83b4e1f720Anders Carlsson Diag(TryLoc, diag::err_exceptions_disabled) << "try"; 25047f11d9cf5df1f8ce82af46eabc4ec5cec7d580b0Anders Carlsson 25058351da06ca3082dfd49dd8e3c1785a986920f57cSebastian Redl unsigned NumHandlers = RawHandlers.size(); 25068351da06ca3082dfd49dd8e3c1785a986920f57cSebastian Redl assert(NumHandlers > 0 && 25078351da06ca3082dfd49dd8e3c1785a986920f57cSebastian Redl "The parser shouldn't call this if there are no handlers."); 25089ae2f076ca5ab1feb3ba95629099ec2319833701John McCall Stmt **Handlers = RawHandlers.get(); 25098351da06ca3082dfd49dd8e3c1785a986920f57cSebastian Redl 25105f9e272e632e951b1efe824cd16acb4d96077930Chris Lattner SmallVector<TypeWithHandler, 8> TypesWithHandlers; 25111eb4433ac451dc16f4133a88af2d002ac26c58efMike Stump 25121eb4433ac451dc16f4133a88af2d002ac26c58efMike Stump for (unsigned i = 0; i < NumHandlers; ++i) { 25135f9e272e632e951b1efe824cd16acb4d96077930Chris Lattner CXXCatchStmt *Handler = cast<CXXCatchStmt>(Handlers[i]); 2514c447aba04527a71d254b151f79f444d1cbe83ce9Sebastian Redl if (!Handler->getExceptionDecl()) { 2515c447aba04527a71d254b151f79f444d1cbe83ce9Sebastian Redl if (i < NumHandlers - 1) 2516c447aba04527a71d254b151f79f444d1cbe83ce9Sebastian Redl return StmtError(Diag(Handler->getLocStart(), 2517c447aba04527a71d254b151f79f444d1cbe83ce9Sebastian Redl diag::err_early_catch_all)); 25181eb4433ac451dc16f4133a88af2d002ac26c58efMike Stump 2519c447aba04527a71d254b151f79f444d1cbe83ce9Sebastian Redl continue; 2520c447aba04527a71d254b151f79f444d1cbe83ce9Sebastian Redl } 25211eb4433ac451dc16f4133a88af2d002ac26c58efMike Stump 2522c447aba04527a71d254b151f79f444d1cbe83ce9Sebastian Redl const QualType CaughtType = Handler->getCaughtType(); 2523c447aba04527a71d254b151f79f444d1cbe83ce9Sebastian Redl const QualType CanonicalCaughtType = Context.getCanonicalType(CaughtType); 2524c447aba04527a71d254b151f79f444d1cbe83ce9Sebastian Redl TypesWithHandlers.push_back(TypeWithHandler(CanonicalCaughtType, Handler)); 2525c447aba04527a71d254b151f79f444d1cbe83ce9Sebastian Redl } 2526c447aba04527a71d254b151f79f444d1cbe83ce9Sebastian Redl 2527c447aba04527a71d254b151f79f444d1cbe83ce9Sebastian Redl // Detect handlers for the same type as an earlier one. 2528c447aba04527a71d254b151f79f444d1cbe83ce9Sebastian Redl if (NumHandlers > 1) { 2529c447aba04527a71d254b151f79f444d1cbe83ce9Sebastian Redl llvm::array_pod_sort(TypesWithHandlers.begin(), TypesWithHandlers.end()); 25301eb4433ac451dc16f4133a88af2d002ac26c58efMike Stump 2531c447aba04527a71d254b151f79f444d1cbe83ce9Sebastian Redl TypeWithHandler prev = TypesWithHandlers[0]; 2532c447aba04527a71d254b151f79f444d1cbe83ce9Sebastian Redl for (unsigned i = 1; i < TypesWithHandlers.size(); ++i) { 2533c447aba04527a71d254b151f79f444d1cbe83ce9Sebastian Redl TypeWithHandler curr = TypesWithHandlers[i]; 25341eb4433ac451dc16f4133a88af2d002ac26c58efMike Stump 2535c447aba04527a71d254b151f79f444d1cbe83ce9Sebastian Redl if (curr == prev) { 2536c447aba04527a71d254b151f79f444d1cbe83ce9Sebastian Redl Diag(curr.getTypeSpecStartLoc(), 2537c447aba04527a71d254b151f79f444d1cbe83ce9Sebastian Redl diag::warn_exception_caught_by_earlier_handler) 2538c447aba04527a71d254b151f79f444d1cbe83ce9Sebastian Redl << curr.getCatchStmt()->getCaughtType().getAsString(); 2539c447aba04527a71d254b151f79f444d1cbe83ce9Sebastian Redl Diag(prev.getTypeSpecStartLoc(), 2540c447aba04527a71d254b151f79f444d1cbe83ce9Sebastian Redl diag::note_previous_exception_handler) 2541c447aba04527a71d254b151f79f444d1cbe83ce9Sebastian Redl << prev.getCatchStmt()->getCaughtType().getAsString(); 2542c447aba04527a71d254b151f79f444d1cbe83ce9Sebastian Redl } 25431eb4433ac451dc16f4133a88af2d002ac26c58efMike Stump 2544c447aba04527a71d254b151f79f444d1cbe83ce9Sebastian Redl prev = curr; 2545c447aba04527a71d254b151f79f444d1cbe83ce9Sebastian Redl } 25468351da06ca3082dfd49dd8e3c1785a986920f57cSebastian Redl } 25471eb4433ac451dc16f4133a88af2d002ac26c58efMike Stump 2548781472fe99a120098c631b0cbe33c89f8cef5e70John McCall getCurFunction()->setHasBranchProtectedScope(); 2549b60a77e453d32db0ab1914d28e175c2defc0eb65John McCall 25508351da06ca3082dfd49dd8e3c1785a986920f57cSebastian Redl // FIXME: We should detect handlers that cannot catch anything because an 25518351da06ca3082dfd49dd8e3c1785a986920f57cSebastian Redl // earlier handler catches a superclass. Need to find a method that is not 25528351da06ca3082dfd49dd8e3c1785a986920f57cSebastian Redl // quadratic for this. 25538351da06ca3082dfd49dd8e3c1785a986920f57cSebastian Redl // Neither of these are explicitly forbidden, but every compiler detects them 25548351da06ca3082dfd49dd8e3c1785a986920f57cSebastian Redl // and warns. 25558351da06ca3082dfd49dd8e3c1785a986920f57cSebastian Redl 25569ae2f076ca5ab1feb3ba95629099ec2319833701John McCall return Owned(CXXTryStmt::Create(Context, TryLoc, TryBlock, 2557a1a396df16c02b22983b5c9592022fd9237d4866Sam Weinig Handlers, NumHandlers)); 25588351da06ca3082dfd49dd8e3c1785a986920f57cSebastian Redl} 255928bbe4b8acc338476fe0825769b41fb32b423c72John Wiegley 256028bbe4b8acc338476fe0825769b41fb32b423c72John WiegleyStmtResult 256128bbe4b8acc338476fe0825769b41fb32b423c72John WiegleySema::ActOnSEHTryBlock(bool IsCXXTry, 256228bbe4b8acc338476fe0825769b41fb32b423c72John Wiegley SourceLocation TryLoc, 256328bbe4b8acc338476fe0825769b41fb32b423c72John Wiegley Stmt *TryBlock, 256428bbe4b8acc338476fe0825769b41fb32b423c72John Wiegley Stmt *Handler) { 256528bbe4b8acc338476fe0825769b41fb32b423c72John Wiegley assert(TryBlock && Handler); 256628bbe4b8acc338476fe0825769b41fb32b423c72John Wiegley 256728bbe4b8acc338476fe0825769b41fb32b423c72John Wiegley getCurFunction()->setHasBranchProtectedScope(); 256828bbe4b8acc338476fe0825769b41fb32b423c72John Wiegley 256928bbe4b8acc338476fe0825769b41fb32b423c72John Wiegley return Owned(SEHTryStmt::Create(Context,IsCXXTry,TryLoc,TryBlock,Handler)); 257028bbe4b8acc338476fe0825769b41fb32b423c72John Wiegley} 257128bbe4b8acc338476fe0825769b41fb32b423c72John Wiegley 257228bbe4b8acc338476fe0825769b41fb32b423c72John WiegleyStmtResult 257328bbe4b8acc338476fe0825769b41fb32b423c72John WiegleySema::ActOnSEHExceptBlock(SourceLocation Loc, 257428bbe4b8acc338476fe0825769b41fb32b423c72John Wiegley Expr *FilterExpr, 257528bbe4b8acc338476fe0825769b41fb32b423c72John Wiegley Stmt *Block) { 257628bbe4b8acc338476fe0825769b41fb32b423c72John Wiegley assert(FilterExpr && Block); 257728bbe4b8acc338476fe0825769b41fb32b423c72John Wiegley 257828bbe4b8acc338476fe0825769b41fb32b423c72John Wiegley if(!FilterExpr->getType()->isIntegerType()) { 257958f14c012e5d739b09532bb12645dc161f88cfcfFrancois Pichet return StmtError(Diag(FilterExpr->getExprLoc(), 258058f14c012e5d739b09532bb12645dc161f88cfcfFrancois Pichet diag::err_filter_expression_integral) 258158f14c012e5d739b09532bb12645dc161f88cfcfFrancois Pichet << FilterExpr->getType()); 258228bbe4b8acc338476fe0825769b41fb32b423c72John Wiegley } 258328bbe4b8acc338476fe0825769b41fb32b423c72John Wiegley 258428bbe4b8acc338476fe0825769b41fb32b423c72John Wiegley return Owned(SEHExceptStmt::Create(Context,Loc,FilterExpr,Block)); 258528bbe4b8acc338476fe0825769b41fb32b423c72John Wiegley} 258628bbe4b8acc338476fe0825769b41fb32b423c72John Wiegley 258728bbe4b8acc338476fe0825769b41fb32b423c72John WiegleyStmtResult 258828bbe4b8acc338476fe0825769b41fb32b423c72John WiegleySema::ActOnSEHFinallyBlock(SourceLocation Loc, 258928bbe4b8acc338476fe0825769b41fb32b423c72John Wiegley Stmt *Block) { 259028bbe4b8acc338476fe0825769b41fb32b423c72John Wiegley assert(Block); 259128bbe4b8acc338476fe0825769b41fb32b423c72John Wiegley return Owned(SEHFinallyStmt::Create(Context,Loc,Block)); 259228bbe4b8acc338476fe0825769b41fb32b423c72John Wiegley} 2593ba0513de93d2fab6db5ab30b6927209fcc883078Douglas Gregor 2594ba0513de93d2fab6db5ab30b6927209fcc883078Douglas GregorStmtResult Sema::BuildMSDependentExistsStmt(SourceLocation KeywordLoc, 2595ba0513de93d2fab6db5ab30b6927209fcc883078Douglas Gregor bool IsIfExists, 2596ba0513de93d2fab6db5ab30b6927209fcc883078Douglas Gregor NestedNameSpecifierLoc QualifierLoc, 2597ba0513de93d2fab6db5ab30b6927209fcc883078Douglas Gregor DeclarationNameInfo NameInfo, 2598ba0513de93d2fab6db5ab30b6927209fcc883078Douglas Gregor Stmt *Nested) 2599ba0513de93d2fab6db5ab30b6927209fcc883078Douglas Gregor{ 2600ba0513de93d2fab6db5ab30b6927209fcc883078Douglas Gregor return new (Context) MSDependentExistsStmt(KeywordLoc, IsIfExists, 2601ba0513de93d2fab6db5ab30b6927209fcc883078Douglas Gregor QualifierLoc, NameInfo, 2602ba0513de93d2fab6db5ab30b6927209fcc883078Douglas Gregor cast<CompoundStmt>(Nested)); 2603ba0513de93d2fab6db5ab30b6927209fcc883078Douglas Gregor} 2604ba0513de93d2fab6db5ab30b6927209fcc883078Douglas Gregor 2605ba0513de93d2fab6db5ab30b6927209fcc883078Douglas Gregor 2606ba0513de93d2fab6db5ab30b6927209fcc883078Douglas GregorStmtResult Sema::ActOnMSDependentExistsStmt(SourceLocation KeywordLoc, 2607ba0513de93d2fab6db5ab30b6927209fcc883078Douglas Gregor bool IsIfExists, 2608ba0513de93d2fab6db5ab30b6927209fcc883078Douglas Gregor CXXScopeSpec &SS, 2609ba0513de93d2fab6db5ab30b6927209fcc883078Douglas Gregor UnqualifiedId &Name, 2610ba0513de93d2fab6db5ab30b6927209fcc883078Douglas Gregor Stmt *Nested) { 2611ba0513de93d2fab6db5ab30b6927209fcc883078Douglas Gregor return BuildMSDependentExistsStmt(KeywordLoc, IsIfExists, 2612ba0513de93d2fab6db5ab30b6927209fcc883078Douglas Gregor SS.getWithLocInContext(Context), 2613ba0513de93d2fab6db5ab30b6927209fcc883078Douglas Gregor GetNameFromUnqualifiedId(Name), 2614ba0513de93d2fab6db5ab30b6927209fcc883078Douglas Gregor Nested); 2615ba0513de93d2fab6db5ab30b6927209fcc883078Douglas Gregor} 2616