SemaStmt.cpp revision 50bf68fc9698742e36c311fc37e6e4b7de235c4b
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" 1951fe996231b1d7199f76e4005ff4c943d5deeecdAnders Carlsson#include "clang/AST/APValue.h" 20f4021e7d5228a2be5a380269dffa0331a6c78b95Chris Lattner#include "clang/AST/ASTContext.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, 50b7d98d35ea723624345f06e5895ddce2e0388ef0Argyrios Kyrtzidis SourceLocation LeadingEmptyMacroLoc) { 51b7d98d35ea723624345f06e5895ddce2e0388ef0Argyrios Kyrtzidis return Owned(new (Context) NullStmt(SemiLoc, LeadingEmptyMacroLoc)); 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 959d8eb3b2a892697aed332f6c318a8554fc2623ceChandler Carruth/// \brief Diagnose '==' and '!=' in top-level statements as likely 969d8eb3b2a892697aed332f6c318a8554fc2623ceChandler Carruth/// typos for '=' or '|=' (resp.). 979d8eb3b2a892697aed332f6c318a8554fc2623ceChandler Carruth/// 989d8eb3b2a892697aed332f6c318a8554fc2623ceChandler Carruth/// This function looks through common stand-alone statements to dig out the 999d8eb3b2a892697aed332f6c318a8554fc2623ceChandler Carruth/// substatement of interest. It should be viable to call on any direct member 1009d8eb3b2a892697aed332f6c318a8554fc2623ceChandler Carruth/// of a CompoundStmt. 1019d8eb3b2a892697aed332f6c318a8554fc2623ceChandler Carruth/// 1029d8eb3b2a892697aed332f6c318a8554fc2623ceChandler Carruth/// Adding a cast to void (or other expression wrappers) will prevent the 1039d8eb3b2a892697aed332f6c318a8554fc2623ceChandler Carruth/// warning from firing. 1049d8eb3b2a892697aed332f6c318a8554fc2623ceChandler Carruthstatic void DiagnoseTopLevelComparison(Sema &S, const Stmt *Statement) { 1059d8eb3b2a892697aed332f6c318a8554fc2623ceChandler Carruth if (!Statement) return; 1069d8eb3b2a892697aed332f6c318a8554fc2623ceChandler Carruth const Expr *E = dyn_cast<Expr>(Statement); 1079d8eb3b2a892697aed332f6c318a8554fc2623ceChandler Carruth if (!E) { 1089d8eb3b2a892697aed332f6c318a8554fc2623ceChandler Carruth // Descend to sub-statements where they remain "top-level" in that they're 1099d8eb3b2a892697aed332f6c318a8554fc2623ceChandler Carruth // unused. 1109d8eb3b2a892697aed332f6c318a8554fc2623ceChandler Carruth switch (Statement->getStmtClass()) { 1119d8eb3b2a892697aed332f6c318a8554fc2623ceChandler Carruth default: 1129d8eb3b2a892697aed332f6c318a8554fc2623ceChandler Carruth // Skip statements which don't have a direct substatement of interest. 1139d8eb3b2a892697aed332f6c318a8554fc2623ceChandler Carruth // Compound statements are handled by the caller. 1149d8eb3b2a892697aed332f6c318a8554fc2623ceChandler Carruth return; 1159d8eb3b2a892697aed332f6c318a8554fc2623ceChandler Carruth 1169d8eb3b2a892697aed332f6c318a8554fc2623ceChandler Carruth case Stmt::CaseStmtClass: 1179d8eb3b2a892697aed332f6c318a8554fc2623ceChandler Carruth case Stmt::DefaultStmtClass: 1189d8eb3b2a892697aed332f6c318a8554fc2623ceChandler Carruth DiagnoseTopLevelComparison(S, cast<SwitchCase>(Statement)->getSubStmt()); 1199d8eb3b2a892697aed332f6c318a8554fc2623ceChandler Carruth return; 1209d8eb3b2a892697aed332f6c318a8554fc2623ceChandler Carruth case Stmt::LabelStmtClass: 1219d8eb3b2a892697aed332f6c318a8554fc2623ceChandler Carruth DiagnoseTopLevelComparison(S, cast<LabelStmt>(Statement)->getSubStmt()); 1229d8eb3b2a892697aed332f6c318a8554fc2623ceChandler Carruth return; 1239d8eb3b2a892697aed332f6c318a8554fc2623ceChandler Carruth 1249d8eb3b2a892697aed332f6c318a8554fc2623ceChandler Carruth case Stmt::DoStmtClass: 1259d8eb3b2a892697aed332f6c318a8554fc2623ceChandler Carruth DiagnoseTopLevelComparison(S, cast<DoStmt>(Statement)->getBody()); 1269d8eb3b2a892697aed332f6c318a8554fc2623ceChandler Carruth return; 1279d8eb3b2a892697aed332f6c318a8554fc2623ceChandler Carruth case Stmt::IfStmtClass: { 1289d8eb3b2a892697aed332f6c318a8554fc2623ceChandler Carruth const IfStmt *If = cast<IfStmt>(Statement); 1299d8eb3b2a892697aed332f6c318a8554fc2623ceChandler Carruth DiagnoseTopLevelComparison(S, If->getThen()); 1309d8eb3b2a892697aed332f6c318a8554fc2623ceChandler Carruth DiagnoseTopLevelComparison(S, If->getElse()); 1319d8eb3b2a892697aed332f6c318a8554fc2623ceChandler Carruth return; 1329d8eb3b2a892697aed332f6c318a8554fc2623ceChandler Carruth } 1339d8eb3b2a892697aed332f6c318a8554fc2623ceChandler Carruth case Stmt::ForStmtClass: { 1349d8eb3b2a892697aed332f6c318a8554fc2623ceChandler Carruth const ForStmt *ForLoop = cast<ForStmt>(Statement); 1359d8eb3b2a892697aed332f6c318a8554fc2623ceChandler Carruth DiagnoseTopLevelComparison(S, ForLoop->getInit()); 1369d8eb3b2a892697aed332f6c318a8554fc2623ceChandler Carruth DiagnoseTopLevelComparison(S, ForLoop->getInc()); 1379d8eb3b2a892697aed332f6c318a8554fc2623ceChandler Carruth DiagnoseTopLevelComparison(S, ForLoop->getBody()); 1389d8eb3b2a892697aed332f6c318a8554fc2623ceChandler Carruth return; 1399d8eb3b2a892697aed332f6c318a8554fc2623ceChandler Carruth } 1409d8eb3b2a892697aed332f6c318a8554fc2623ceChandler Carruth case Stmt::SwitchStmtClass: 1419d8eb3b2a892697aed332f6c318a8554fc2623ceChandler Carruth DiagnoseTopLevelComparison(S, cast<SwitchStmt>(Statement)->getBody()); 1429d8eb3b2a892697aed332f6c318a8554fc2623ceChandler Carruth return; 1439d8eb3b2a892697aed332f6c318a8554fc2623ceChandler Carruth case Stmt::WhileStmtClass: 1449d8eb3b2a892697aed332f6c318a8554fc2623ceChandler Carruth DiagnoseTopLevelComparison(S, cast<WhileStmt>(Statement)->getBody()); 1459d8eb3b2a892697aed332f6c318a8554fc2623ceChandler Carruth return; 1469d8eb3b2a892697aed332f6c318a8554fc2623ceChandler Carruth } 1479d8eb3b2a892697aed332f6c318a8554fc2623ceChandler Carruth } 1489d8eb3b2a892697aed332f6c318a8554fc2623ceChandler Carruth 1499d8eb3b2a892697aed332f6c318a8554fc2623ceChandler Carruth SourceLocation Loc; 15050bf68fc9698742e36c311fc37e6e4b7de235c4bChandler Carruth bool IsNotEqual, CanAssign; 1519d8eb3b2a892697aed332f6c318a8554fc2623ceChandler Carruth 1529d8eb3b2a892697aed332f6c318a8554fc2623ceChandler Carruth if (const BinaryOperator *Op = dyn_cast<BinaryOperator>(E)) { 1539d8eb3b2a892697aed332f6c318a8554fc2623ceChandler Carruth if (Op->getOpcode() != BO_EQ && Op->getOpcode() != BO_NE) 1549d8eb3b2a892697aed332f6c318a8554fc2623ceChandler Carruth return; 1559d8eb3b2a892697aed332f6c318a8554fc2623ceChandler Carruth 1569d8eb3b2a892697aed332f6c318a8554fc2623ceChandler Carruth Loc = Op->getOperatorLoc(); 15750bf68fc9698742e36c311fc37e6e4b7de235c4bChandler Carruth IsNotEqual = Op->getOpcode() == BO_NE; 15850bf68fc9698742e36c311fc37e6e4b7de235c4bChandler Carruth CanAssign = Op->getLHS()->IgnoreParenImpCasts()->isLValue(); 1599d8eb3b2a892697aed332f6c318a8554fc2623ceChandler Carruth } else if (const CXXOperatorCallExpr *Op = dyn_cast<CXXOperatorCallExpr>(E)) { 1609d8eb3b2a892697aed332f6c318a8554fc2623ceChandler Carruth if (Op->getOperator() != OO_EqualEqual && 1619d8eb3b2a892697aed332f6c318a8554fc2623ceChandler Carruth Op->getOperator() != OO_ExclaimEqual) 1629d8eb3b2a892697aed332f6c318a8554fc2623ceChandler Carruth return; 1639d8eb3b2a892697aed332f6c318a8554fc2623ceChandler Carruth 1649d8eb3b2a892697aed332f6c318a8554fc2623ceChandler Carruth Loc = Op->getOperatorLoc(); 16550bf68fc9698742e36c311fc37e6e4b7de235c4bChandler Carruth IsNotEqual = Op->getOperator() == OO_ExclaimEqual; 16650bf68fc9698742e36c311fc37e6e4b7de235c4bChandler Carruth CanAssign = Op->getArg(0)->IgnoreParenImpCasts()->isLValue(); 1679d8eb3b2a892697aed332f6c318a8554fc2623ceChandler Carruth } else { 1689d8eb3b2a892697aed332f6c318a8554fc2623ceChandler Carruth // Not a typo-prone comparison. 1699d8eb3b2a892697aed332f6c318a8554fc2623ceChandler Carruth return; 1709d8eb3b2a892697aed332f6c318a8554fc2623ceChandler Carruth } 1719d8eb3b2a892697aed332f6c318a8554fc2623ceChandler Carruth 1729d8eb3b2a892697aed332f6c318a8554fc2623ceChandler Carruth // Suppress warnings when the operator, suspicious as it may be, comes from 1739d8eb3b2a892697aed332f6c318a8554fc2623ceChandler Carruth // a macro expansion. 1749d8eb3b2a892697aed332f6c318a8554fc2623ceChandler Carruth if (Loc.isMacroID()) 1759d8eb3b2a892697aed332f6c318a8554fc2623ceChandler Carruth return; 1769d8eb3b2a892697aed332f6c318a8554fc2623ceChandler Carruth 1779d8eb3b2a892697aed332f6c318a8554fc2623ceChandler Carruth S.Diag(Loc, diag::warn_comparison_top_level_stmt) 1789d8eb3b2a892697aed332f6c318a8554fc2623ceChandler Carruth << (unsigned)IsNotEqual << E->getSourceRange(); 1799d8eb3b2a892697aed332f6c318a8554fc2623ceChandler Carruth 1809d8eb3b2a892697aed332f6c318a8554fc2623ceChandler Carruth SourceLocation Open = E->getSourceRange().getBegin(); 1819d8eb3b2a892697aed332f6c318a8554fc2623ceChandler Carruth SourceLocation Close = S.PP.getLocForEndOfToken(E->getSourceRange().getEnd()); 1829d8eb3b2a892697aed332f6c318a8554fc2623ceChandler Carruth S.Diag(Loc, diag::note_top_level_comparison_void_cast_silence) 1839d8eb3b2a892697aed332f6c318a8554fc2623ceChandler Carruth << FixItHint::CreateInsertion(Open, "(void)(") 1849d8eb3b2a892697aed332f6c318a8554fc2623ceChandler Carruth << FixItHint::CreateInsertion(Close, ")"); 1859d8eb3b2a892697aed332f6c318a8554fc2623ceChandler Carruth 18650bf68fc9698742e36c311fc37e6e4b7de235c4bChandler Carruth // If the LHS is a plausible entity to assign to, provide a fixit hint to 18750bf68fc9698742e36c311fc37e6e4b7de235c4bChandler Carruth // correct common typos. 18850bf68fc9698742e36c311fc37e6e4b7de235c4bChandler Carruth if (CanAssign) { 18950bf68fc9698742e36c311fc37e6e4b7de235c4bChandler Carruth if (IsNotEqual) 19050bf68fc9698742e36c311fc37e6e4b7de235c4bChandler Carruth S.Diag(Loc, diag::note_inequality_comparison_to_or_assign) 19150bf68fc9698742e36c311fc37e6e4b7de235c4bChandler Carruth << FixItHint::CreateReplacement(Loc, "|="); 19250bf68fc9698742e36c311fc37e6e4b7de235c4bChandler Carruth else 19350bf68fc9698742e36c311fc37e6e4b7de235c4bChandler Carruth S.Diag(Loc, diag::note_equality_comparison_to_assign) 19450bf68fc9698742e36c311fc37e6e4b7de235c4bChandler Carruth << FixItHint::CreateReplacement(Loc, "="); 19550bf68fc9698742e36c311fc37e6e4b7de235c4bChandler Carruth } 1969d8eb3b2a892697aed332f6c318a8554fc2623ceChandler Carruth} 1979d8eb3b2a892697aed332f6c318a8554fc2623ceChandler Carruth 198636463e4c43be15e2f0fd0b8a08667f3066d8af7Anders Carlssonvoid Sema::DiagnoseUnusedExprResult(const Stmt *S) { 199d2827af6f96d441d72315dbe6d8505c3be0f2aa6Argyrios Kyrtzidis if (const LabelStmt *Label = dyn_cast_or_null<LabelStmt>(S)) 200d2827af6f96d441d72315dbe6d8505c3be0f2aa6Argyrios Kyrtzidis return DiagnoseUnusedExprResult(Label->getSubStmt()); 201d2827af6f96d441d72315dbe6d8505c3be0f2aa6Argyrios Kyrtzidis 202754431107b61a0523df5271c2876a73dd5a051e9Anders Carlsson const Expr *E = dyn_cast_or_null<Expr>(S); 203636463e4c43be15e2f0fd0b8a08667f3066d8af7Anders Carlsson if (!E) 204636463e4c43be15e2f0fd0b8a08667f3066d8af7Anders Carlsson return; 205636463e4c43be15e2f0fd0b8a08667f3066d8af7Anders Carlsson 206636463e4c43be15e2f0fd0b8a08667f3066d8af7Anders Carlsson SourceLocation Loc; 207636463e4c43be15e2f0fd0b8a08667f3066d8af7Anders Carlsson SourceRange R1, R2; 208df317bf71653eeb235da8337b1e8e790f9653aa4Mike Stump if (!E->isUnusedResultAWarning(Loc, R1, R2, Context)) 209636463e4c43be15e2f0fd0b8a08667f3066d8af7Anders Carlsson return; 2101eb4433ac451dc16f4133a88af2d002ac26c58efMike Stump 211419cfb318cd69b6c717019288d5a3822be18d8f9Chris Lattner // Okay, we have an unused result. Depending on what the base expression is, 212419cfb318cd69b6c717019288d5a3822be18d8f9Chris Lattner // we might want to make a more specific diagnostic. Check for one of these 213419cfb318cd69b6c717019288d5a3822be18d8f9Chris Lattner // cases now. 214419cfb318cd69b6c717019288d5a3822be18d8f9Chris Lattner unsigned DiagID = diag::warn_unused_expr; 2154765fa05b5652fcc4356371c2f481d0ea9a1b007John McCall if (const ExprWithCleanups *Temps = dyn_cast<ExprWithCleanups>(E)) 2164dffad64c5c7106dc5ac506be94944299c8f7bc3Douglas Gregor E = Temps->getSubExpr(); 21734d49471e0b6386aefdc0f6bd15e4a4876ce5db1Chandler Carruth if (const CXXBindTemporaryExpr *TempExpr = dyn_cast<CXXBindTemporaryExpr>(E)) 21834d49471e0b6386aefdc0f6bd15e4a4876ce5db1Chandler Carruth E = TempExpr->getSubExpr(); 21912f78a6741a4cb3d904340f8d3d2714568b50e7aJohn McCall 220f6a1648197562e0b133440d612d9af297d0a86ccJohn McCall E = E->IgnoreParenImpCasts(); 221bc8d42c6f1565c0b2f93ad524edebfd7a4e6cac6Chris Lattner if (const CallExpr *CE = dyn_cast<CallExpr>(E)) { 2220faede6f31b07bcec7b776f2b420c3ea9bb3e58cJohn McCall if (E->getType()->isVoidType()) 2230faede6f31b07bcec7b776f2b420c3ea9bb3e58cJohn McCall return; 2240faede6f31b07bcec7b776f2b420c3ea9bb3e58cJohn McCall 225bc8d42c6f1565c0b2f93ad524edebfd7a4e6cac6Chris Lattner // If the callee has attribute pure, const, or warn_unused_result, warn with 226bc8d42c6f1565c0b2f93ad524edebfd7a4e6cac6Chris Lattner // a more specific message to make it clear what is happening. 227d20254f2875d0004c57ee766f258dbcee29f4841Nuno Lopes if (const Decl *FD = CE->getCalleeDecl()) { 228bc8d42c6f1565c0b2f93ad524edebfd7a4e6cac6Chris Lattner if (FD->getAttr<WarnUnusedResultAttr>()) { 22942d7b2d25b6f90dc397886d05502b10ab5a8b51bMatt Beaumont-Gay Diag(Loc, diag::warn_unused_result) << R1 << R2; 230bc8d42c6f1565c0b2f93ad524edebfd7a4e6cac6Chris Lattner return; 231bc8d42c6f1565c0b2f93ad524edebfd7a4e6cac6Chris Lattner } 232bc8d42c6f1565c0b2f93ad524edebfd7a4e6cac6Chris Lattner if (FD->getAttr<PureAttr>()) { 233bc8d42c6f1565c0b2f93ad524edebfd7a4e6cac6Chris Lattner Diag(Loc, diag::warn_unused_call) << R1 << R2 << "pure"; 234bc8d42c6f1565c0b2f93ad524edebfd7a4e6cac6Chris Lattner return; 235bc8d42c6f1565c0b2f93ad524edebfd7a4e6cac6Chris Lattner } 236bc8d42c6f1565c0b2f93ad524edebfd7a4e6cac6Chris Lattner if (FD->getAttr<ConstAttr>()) { 237bc8d42c6f1565c0b2f93ad524edebfd7a4e6cac6Chris Lattner Diag(Loc, diag::warn_unused_call) << R1 << R2 << "const"; 238bc8d42c6f1565c0b2f93ad524edebfd7a4e6cac6Chris Lattner return; 239bc8d42c6f1565c0b2f93ad524edebfd7a4e6cac6Chris Lattner } 240dfbb02a16ac8c764b5ba1742450513d6212d2f9fNAKAMURA Takumi } 24112f78a6741a4cb3d904340f8d3d2714568b50e7aJohn McCall } else if (const ObjCMessageExpr *ME = dyn_cast<ObjCMessageExpr>(E)) { 242f85e193739c953358c865005855253af4f68a497John McCall if (getLangOptions().ObjCAutoRefCount && ME->isDelegateInitCall()) { 243f85e193739c953358c865005855253af4f68a497John McCall Diag(Loc, diag::err_arc_unused_init_message) << R1; 244f85e193739c953358c865005855253af4f68a497John McCall return; 245f85e193739c953358c865005855253af4f68a497John McCall } 246f031774aa2638b4d3f487e7e44180c1f89b867efFariborz Jahanian const ObjCMethodDecl *MD = ME->getMethodDecl(); 247f031774aa2638b4d3f487e7e44180c1f89b867efFariborz Jahanian if (MD && MD->getAttr<WarnUnusedResultAttr>()) { 24842d7b2d25b6f90dc397886d05502b10ab5a8b51bMatt Beaumont-Gay Diag(Loc, diag::warn_unused_result) << R1 << R2; 249f031774aa2638b4d3f487e7e44180c1f89b867efFariborz Jahanian return; 250f031774aa2638b4d3f487e7e44180c1f89b867efFariborz Jahanian } 25112f78a6741a4cb3d904340f8d3d2714568b50e7aJohn McCall } else if (isa<ObjCPropertyRefExpr>(E)) { 25212f78a6741a4cb3d904340f8d3d2714568b50e7aJohn McCall DiagID = diag::warn_unused_property_expr; 253d6e44a3c4193bd422bfa78c8086fb16bb2168e34Douglas Gregor } else if (const CXXFunctionalCastExpr *FC 254d6e44a3c4193bd422bfa78c8086fb16bb2168e34Douglas Gregor = dyn_cast<CXXFunctionalCastExpr>(E)) { 255d6e44a3c4193bd422bfa78c8086fb16bb2168e34Douglas Gregor if (isa<CXXConstructExpr>(FC->getSubExpr()) || 256d6e44a3c4193bd422bfa78c8086fb16bb2168e34Douglas Gregor isa<CXXTemporaryObjectExpr>(FC->getSubExpr())) 257d6e44a3c4193bd422bfa78c8086fb16bb2168e34Douglas Gregor return; 258f031774aa2638b4d3f487e7e44180c1f89b867efFariborz Jahanian } 259209acbd6d0c1b4444eb8c1682717753e1cbe38deJohn McCall // Diagnose "(void*) blah" as a typo for "(void) blah". 260209acbd6d0c1b4444eb8c1682717753e1cbe38deJohn McCall else if (const CStyleCastExpr *CE = dyn_cast<CStyleCastExpr>(E)) { 261209acbd6d0c1b4444eb8c1682717753e1cbe38deJohn McCall TypeSourceInfo *TI = CE->getTypeInfoAsWritten(); 262209acbd6d0c1b4444eb8c1682717753e1cbe38deJohn McCall QualType T = TI->getType(); 263209acbd6d0c1b4444eb8c1682717753e1cbe38deJohn McCall 264209acbd6d0c1b4444eb8c1682717753e1cbe38deJohn McCall // We really do want to use the non-canonical type here. 265209acbd6d0c1b4444eb8c1682717753e1cbe38deJohn McCall if (T == Context.VoidPtrTy) { 266209acbd6d0c1b4444eb8c1682717753e1cbe38deJohn McCall PointerTypeLoc TL = cast<PointerTypeLoc>(TI->getTypeLoc()); 267209acbd6d0c1b4444eb8c1682717753e1cbe38deJohn McCall 268209acbd6d0c1b4444eb8c1682717753e1cbe38deJohn McCall Diag(Loc, diag::warn_unused_voidptr) 269209acbd6d0c1b4444eb8c1682717753e1cbe38deJohn McCall << FixItHint::CreateRemoval(TL.getStarLoc()); 270209acbd6d0c1b4444eb8c1682717753e1cbe38deJohn McCall return; 271209acbd6d0c1b4444eb8c1682717753e1cbe38deJohn McCall } 272209acbd6d0c1b4444eb8c1682717753e1cbe38deJohn McCall } 273209acbd6d0c1b4444eb8c1682717753e1cbe38deJohn McCall 274351ba91eaa6d30e523587b2d7ed676a5172c6e56Ted Kremenek DiagRuntimeBehavior(Loc, 0, PDiag(DiagID) << R1 << R2); 275636463e4c43be15e2f0fd0b8a08667f3066d8af7Anders Carlsson} 276636463e4c43be15e2f0fd0b8a08667f3066d8af7Anders Carlsson 27760d7b3a319d84d688752be3870615ac0f111fb16John McCallStmtResult 2781b273c403734d343d720acb28f04011807c8aa56Steve NaroffSema::ActOnCompoundStmt(SourceLocation L, SourceLocation R, 279a60528cdac7deee3991c2b48af4df4f315e49e9dSebastian Redl MultiStmtArg elts, bool isStmtExpr) { 280a60528cdac7deee3991c2b48af4df4f315e49e9dSebastian Redl unsigned NumElts = elts.size(); 281a60528cdac7deee3991c2b48af4df4f315e49e9dSebastian Redl Stmt **Elts = reinterpret_cast<Stmt**>(elts.release()); 282c30ebfbf23d6a471146e3c68c2cf7f170b7e55dcChris Lattner // If we're in C89 mode, check that we don't have any decls after stmts. If 283c30ebfbf23d6a471146e3c68c2cf7f170b7e55dcChris Lattner // so, emit an extension diagnostic. 284c30ebfbf23d6a471146e3c68c2cf7f170b7e55dcChris Lattner if (!getLangOptions().C99 && !getLangOptions().CPlusPlus) { 285c30ebfbf23d6a471146e3c68c2cf7f170b7e55dcChris Lattner // Note that __extension__ can be around a decl. 286c30ebfbf23d6a471146e3c68c2cf7f170b7e55dcChris Lattner unsigned i = 0; 287c30ebfbf23d6a471146e3c68c2cf7f170b7e55dcChris Lattner // Skip over all declarations. 288c30ebfbf23d6a471146e3c68c2cf7f170b7e55dcChris Lattner for (; i != NumElts && isa<DeclStmt>(Elts[i]); ++i) 289c30ebfbf23d6a471146e3c68c2cf7f170b7e55dcChris Lattner /*empty*/; 290c30ebfbf23d6a471146e3c68c2cf7f170b7e55dcChris Lattner 291c30ebfbf23d6a471146e3c68c2cf7f170b7e55dcChris Lattner // We found the end of the list or a statement. Scan for another declstmt. 292c30ebfbf23d6a471146e3c68c2cf7f170b7e55dcChris Lattner for (; i != NumElts && !isa<DeclStmt>(Elts[i]); ++i) 293c30ebfbf23d6a471146e3c68c2cf7f170b7e55dcChris Lattner /*empty*/; 2941eb4433ac451dc16f4133a88af2d002ac26c58efMike Stump 295c30ebfbf23d6a471146e3c68c2cf7f170b7e55dcChris Lattner if (i != NumElts) { 2964afa39deaa245592977136d367251ee2c173dd8dDouglas Gregor Decl *D = *cast<DeclStmt>(Elts[i])->decl_begin(); 297c30ebfbf23d6a471146e3c68c2cf7f170b7e55dcChris Lattner Diag(D->getLocation(), diag::ext_mixed_decls_code); 298c30ebfbf23d6a471146e3c68c2cf7f170b7e55dcChris Lattner } 299c30ebfbf23d6a471146e3c68c2cf7f170b7e55dcChris Lattner } 30098414c1b7d1944a57156d52e29bd41c005de09acChris Lattner // Warn about unused expressions in statements. 30198414c1b7d1944a57156d52e29bd41c005de09acChris Lattner for (unsigned i = 0; i != NumElts; ++i) { 302636463e4c43be15e2f0fd0b8a08667f3066d8af7Anders Carlsson // Ignore statements that are last in a statement expression. 303636463e4c43be15e2f0fd0b8a08667f3066d8af7Anders Carlsson if (isStmtExpr && i == NumElts - 1) 30498414c1b7d1944a57156d52e29bd41c005de09acChris Lattner continue; 3051eb4433ac451dc16f4133a88af2d002ac26c58efMike Stump 3069d8eb3b2a892697aed332f6c318a8554fc2623ceChandler Carruth // FIXME: It'd be nice to not show both of these. The first is a more 3079d8eb3b2a892697aed332f6c318a8554fc2623ceChandler Carruth // precise (and more likely to be enabled) warning. We should suppress the 3089d8eb3b2a892697aed332f6c318a8554fc2623ceChandler Carruth // second when the first fires. 3099d8eb3b2a892697aed332f6c318a8554fc2623ceChandler Carruth DiagnoseTopLevelComparison(*this, Elts[i]); 310636463e4c43be15e2f0fd0b8a08667f3066d8af7Anders Carlsson DiagnoseUnusedExprResult(Elts[i]); 31198414c1b7d1944a57156d52e29bd41c005de09acChris Lattner } 312a60528cdac7deee3991c2b48af4df4f315e49e9dSebastian Redl 3138189cde56b4f6f938cd65f53c932fe1860d0204cTed Kremenek return Owned(new (Context) CompoundStmt(Context, Elts, NumElts, L, R)); 3145f016e2cb5d11daeb237544de1c5d59f20fe1a6eReid Spencer} 3155f016e2cb5d11daeb237544de1c5d59f20fe1a6eReid Spencer 31660d7b3a319d84d688752be3870615ac0f111fb16John McCallStmtResult 3179ae2f076ca5ab1feb3ba95629099ec2319833701John McCallSema::ActOnCaseStmt(SourceLocation CaseLoc, Expr *LHSVal, 3189ae2f076ca5ab1feb3ba95629099ec2319833701John McCall SourceLocation DotDotDotLoc, Expr *RHSVal, 31924e1e707b4c362f18e371e2bbf054a8345b57bfaChris Lattner SourceLocation ColonLoc) { 3209ae2f076ca5ab1feb3ba95629099ec2319833701John McCall assert((LHSVal != 0) && "missing expression in case statement"); 321117054a99f4994e4ec8a1fc904b554e1f2dc9b29Sebastian Redl 3225f016e2cb5d11daeb237544de1c5d59f20fe1a6eReid Spencer // C99 6.8.4.2p3: The expression shall be an integer constant. 3231eb4433ac451dc16f4133a88af2d002ac26c58efMike Stump // However, GCC allows any evaluatable integer expression. 3241eb4433ac451dc16f4133a88af2d002ac26c58efMike Stump if (!LHSVal->isTypeDependent() && !LHSVal->isValueDependent() && 325dbb26db1d426fb6caaaf1b4fa47b46d1947c12c9Douglas Gregor VerifyIntegerConstantExpression(LHSVal)) 32624e1e707b4c362f18e371e2bbf054a8345b57bfaChris Lattner return StmtError(); 3275f016e2cb5d11daeb237544de1c5d59f20fe1a6eReid Spencer 3286c36be5b383875b490684bcf439d6d427298c1afChris Lattner // GCC extension: The expression shall be an integer constant. 329117054a99f4994e4ec8a1fc904b554e1f2dc9b29Sebastian Redl 330dbb26db1d426fb6caaaf1b4fa47b46d1947c12c9Douglas Gregor if (RHSVal && !RHSVal->isTypeDependent() && !RHSVal->isValueDependent() && 331dbb26db1d426fb6caaaf1b4fa47b46d1947c12c9Douglas Gregor VerifyIntegerConstantExpression(RHSVal)) { 332f4021e7d5228a2be5a380269dffa0331a6c78b95Chris Lattner RHSVal = 0; // Recover by just forgetting about it. 333117054a99f4994e4ec8a1fc904b554e1f2dc9b29Sebastian Redl } 334117054a99f4994e4ec8a1fc904b554e1f2dc9b29Sebastian Redl 335781472fe99a120098c631b0cbe33c89f8cef5e70John McCall if (getCurFunction()->SwitchStack.empty()) { 3368a87e57beb96212ee61dc08a5f691cd7f7710703Chris Lattner Diag(CaseLoc, diag::err_case_not_in_switch); 33724e1e707b4c362f18e371e2bbf054a8345b57bfaChris Lattner return StmtError(); 3388a87e57beb96212ee61dc08a5f691cd7f7710703Chris Lattner } 3395f016e2cb5d11daeb237544de1c5d59f20fe1a6eReid Spencer 340dbb26db1d426fb6caaaf1b4fa47b46d1947c12c9Douglas Gregor CaseStmt *CS = new (Context) CaseStmt(LHSVal, RHSVal, CaseLoc, DotDotDotLoc, 341dbb26db1d426fb6caaaf1b4fa47b46d1947c12c9Douglas Gregor ColonLoc); 342781472fe99a120098c631b0cbe33c89f8cef5e70John McCall getCurFunction()->SwitchStack.back()->addSwitchCase(CS); 343117054a99f4994e4ec8a1fc904b554e1f2dc9b29Sebastian Redl return Owned(CS); 3445f016e2cb5d11daeb237544de1c5d59f20fe1a6eReid Spencer} 3455f016e2cb5d11daeb237544de1c5d59f20fe1a6eReid Spencer 34624e1e707b4c362f18e371e2bbf054a8345b57bfaChris Lattner/// ActOnCaseStmtBody - This installs a statement as the body of a case. 3479ae2f076ca5ab1feb3ba95629099ec2319833701John McCallvoid Sema::ActOnCaseStmtBody(Stmt *caseStmt, Stmt *SubStmt) { 34824e1e707b4c362f18e371e2bbf054a8345b57bfaChris Lattner CaseStmt *CS = static_cast<CaseStmt*>(caseStmt); 34924e1e707b4c362f18e371e2bbf054a8345b57bfaChris Lattner CS->setSubStmt(SubStmt); 35024e1e707b4c362f18e371e2bbf054a8345b57bfaChris Lattner} 35124e1e707b4c362f18e371e2bbf054a8345b57bfaChris Lattner 35260d7b3a319d84d688752be3870615ac0f111fb16John McCallStmtResult 3531eb4433ac451dc16f4133a88af2d002ac26c58efMike StumpSema::ActOnDefaultStmt(SourceLocation DefaultLoc, SourceLocation ColonLoc, 3549ae2f076ca5ab1feb3ba95629099ec2319833701John McCall Stmt *SubStmt, Scope *CurScope) { 355781472fe99a120098c631b0cbe33c89f8cef5e70John McCall if (getCurFunction()->SwitchStack.empty()) { 3560fa152e72bb71c4aa184d0edd91caa9cbebbf70eChris Lattner Diag(DefaultLoc, diag::err_default_not_in_switch); 357117054a99f4994e4ec8a1fc904b554e1f2dc9b29Sebastian Redl return Owned(SubStmt); 3580fa152e72bb71c4aa184d0edd91caa9cbebbf70eChris Lattner } 359117054a99f4994e4ec8a1fc904b554e1f2dc9b29Sebastian Redl 360dbb26db1d426fb6caaaf1b4fa47b46d1947c12c9Douglas Gregor DefaultStmt *DS = new (Context) DefaultStmt(DefaultLoc, ColonLoc, SubStmt); 361781472fe99a120098c631b0cbe33c89f8cef5e70John McCall getCurFunction()->SwitchStack.back()->addSwitchCase(DS); 362117054a99f4994e4ec8a1fc904b554e1f2dc9b29Sebastian Redl return Owned(DS); 3635f016e2cb5d11daeb237544de1c5d59f20fe1a6eReid Spencer} 3645f016e2cb5d11daeb237544de1c5d59f20fe1a6eReid Spencer 36560d7b3a319d84d688752be3870615ac0f111fb16John McCallStmtResult 36657ad37823e198f977cac605dbfbaefb4daf325e9Chris LattnerSema::ActOnLabelStmt(SourceLocation IdentLoc, LabelDecl *TheDecl, 36757ad37823e198f977cac605dbfbaefb4daf325e9Chris Lattner SourceLocation ColonLoc, Stmt *SubStmt) { 36857ad37823e198f977cac605dbfbaefb4daf325e9Chris Lattner 369ad8dcf4a9df0e24051dc31bf9e6f3cd138a34298Chris Lattner // If the label was multiply defined, reject it now. 370ad8dcf4a9df0e24051dc31bf9e6f3cd138a34298Chris Lattner if (TheDecl->getStmt()) { 371ad8dcf4a9df0e24051dc31bf9e6f3cd138a34298Chris Lattner Diag(IdentLoc, diag::err_redefinition_of_label) << TheDecl->getDeclName(); 372ad8dcf4a9df0e24051dc31bf9e6f3cd138a34298Chris Lattner Diag(TheDecl->getLocation(), diag::note_previous_definition); 373de307473448fb3cebcb4c10090728300b53bca03Sebastian Redl return Owned(SubStmt); 3745f016e2cb5d11daeb237544de1c5d59f20fe1a6eReid Spencer } 375de307473448fb3cebcb4c10090728300b53bca03Sebastian Redl 376ad8dcf4a9df0e24051dc31bf9e6f3cd138a34298Chris Lattner // Otherwise, things are good. Fill in the declaration and return it. 377ad8dcf4a9df0e24051dc31bf9e6f3cd138a34298Chris Lattner LabelStmt *LS = new (Context) LabelStmt(IdentLoc, TheDecl, SubStmt); 378ad8dcf4a9df0e24051dc31bf9e6f3cd138a34298Chris Lattner TheDecl->setStmt(LS); 379203548ba4b72e7e59320d352afc1eb0b5ab131deAbramo Bagnara if (!TheDecl->isGnuLocal()) 380203548ba4b72e7e59320d352afc1eb0b5ab131deAbramo Bagnara TheDecl->setLocation(IdentLoc); 381ad8dcf4a9df0e24051dc31bf9e6f3cd138a34298Chris Lattner return Owned(LS); 3825f016e2cb5d11daeb237544de1c5d59f20fe1a6eReid Spencer} 3835f016e2cb5d11daeb237544de1c5d59f20fe1a6eReid Spencer 38460d7b3a319d84d688752be3870615ac0f111fb16John McCallStmtResult 385d226f65006733ed7f709c3174f22ce33391cb58fJohn McCallSema::ActOnIfStmt(SourceLocation IfLoc, FullExprArg CondVal, Decl *CondVar, 38644aa1f397855f130e88e62ffc1029f7f83bb5d2eArgyrios Kyrtzidis Stmt *thenStmt, SourceLocation ElseLoc, 38744aa1f397855f130e88e62ffc1029f7f83bb5d2eArgyrios Kyrtzidis Stmt *elseStmt) { 38860d7b3a319d84d688752be3870615ac0f111fb16John McCall ExprResult CondResult(CondVal.release()); 3891eb4433ac451dc16f4133a88af2d002ac26c58efMike Stump 3908cfe5a784133d90bf329fd20801824a6f71bb8caDouglas Gregor VarDecl *ConditionVar = 0; 391d226f65006733ed7f709c3174f22ce33391cb58fJohn McCall if (CondVar) { 392d226f65006733ed7f709c3174f22ce33391cb58fJohn McCall ConditionVar = cast<VarDecl>(CondVar); 393586596fd7f7a336a2847b300c80614dcf39ab6d5Douglas Gregor CondResult = CheckConditionVariable(ConditionVar, IfLoc, true); 39499e9b4d172f6877e6ba5ebe75bb8238721f5e01cDouglas Gregor if (CondResult.isInvalid()) 39599e9b4d172f6877e6ba5ebe75bb8238721f5e01cDouglas Gregor return StmtError(); 3968cfe5a784133d90bf329fd20801824a6f71bb8caDouglas Gregor } 39799e9b4d172f6877e6ba5ebe75bb8238721f5e01cDouglas Gregor Expr *ConditionExpr = CondResult.takeAs<Expr>(); 39899e9b4d172f6877e6ba5ebe75bb8238721f5e01cDouglas Gregor if (!ConditionExpr) 39999e9b4d172f6877e6ba5ebe75bb8238721f5e01cDouglas Gregor return StmtError(); 400dfbb02a16ac8c764b5ba1742450513d6212d2f9fNAKAMURA Takumi 401754431107b61a0523df5271c2876a73dd5a051e9Anders Carlsson DiagnoseUnusedExprResult(thenStmt); 4025f016e2cb5d11daeb237544de1c5d59f20fe1a6eReid Spencer 4032d85f8ba62fd6fdcf0ae303d77112b413d412caeAnders Carlsson // Warn if the if block has a null body without an else value. 4042d85f8ba62fd6fdcf0ae303d77112b413d412caeAnders Carlsson // this helps prevent bugs due to typos, such as 4052d85f8ba62fd6fdcf0ae303d77112b413d412caeAnders Carlsson // if (condition); 4062d85f8ba62fd6fdcf0ae303d77112b413d412caeAnders Carlsson // do_stuff(); 407b3198178daf9d33466fc18e009e2c6692fdf29c0Ted Kremenek // 4089ae2f076ca5ab1feb3ba95629099ec2319833701John McCall if (!elseStmt) { 4092d85f8ba62fd6fdcf0ae303d77112b413d412caeAnders Carlsson if (NullStmt* stmt = dyn_cast<NullStmt>(thenStmt)) 410a25b6a4b43e8b9611f7506e5fe1b448833b10a46Argyrios Kyrtzidis // But do not warn if the body is a macro that expands to nothing, e.g: 411a25b6a4b43e8b9611f7506e5fe1b448833b10a46Argyrios Kyrtzidis // 412a25b6a4b43e8b9611f7506e5fe1b448833b10a46Argyrios Kyrtzidis // #define CALL(x) 413a25b6a4b43e8b9611f7506e5fe1b448833b10a46Argyrios Kyrtzidis // if (condition) 414a25b6a4b43e8b9611f7506e5fe1b448833b10a46Argyrios Kyrtzidis // CALL(0); 415a25b6a4b43e8b9611f7506e5fe1b448833b10a46Argyrios Kyrtzidis // 41644aa1f397855f130e88e62ffc1029f7f83bb5d2eArgyrios Kyrtzidis if (!stmt->hasLeadingEmptyMacro()) 417b3198178daf9d33466fc18e009e2c6692fdf29c0Ted Kremenek Diag(stmt->getSemiLoc(), diag::warn_empty_if_body); 4182d85f8ba62fd6fdcf0ae303d77112b413d412caeAnders Carlsson } 4192d85f8ba62fd6fdcf0ae303d77112b413d412caeAnders Carlsson 420754431107b61a0523df5271c2876a73dd5a051e9Anders Carlsson DiagnoseUnusedExprResult(elseStmt); 4211eb4433ac451dc16f4133a88af2d002ac26c58efMike Stump 422dfbb02a16ac8c764b5ba1742450513d6212d2f9fNAKAMURA Takumi return Owned(new (Context) IfStmt(Context, IfLoc, ConditionVar, ConditionExpr, 42344aa1f397855f130e88e62ffc1029f7f83bb5d2eArgyrios Kyrtzidis thenStmt, ElseLoc, elseStmt)); 4245f016e2cb5d11daeb237544de1c5d59f20fe1a6eReid Spencer} 4255f016e2cb5d11daeb237544de1c5d59f20fe1a6eReid Spencer 426f4021e7d5228a2be5a380269dffa0331a6c78b95Chris Lattner/// ConvertIntegerToTypeWarnOnOverflow - Convert the specified APInt to have 427f4021e7d5228a2be5a380269dffa0331a6c78b95Chris Lattner/// the specified width and sign. If an overflow occurs, detect it and emit 428f4021e7d5228a2be5a380269dffa0331a6c78b95Chris Lattner/// the specified diagnostic. 429f4021e7d5228a2be5a380269dffa0331a6c78b95Chris Lattnervoid Sema::ConvertIntegerToTypeWarnOnOverflow(llvm::APSInt &Val, 430f4021e7d5228a2be5a380269dffa0331a6c78b95Chris Lattner unsigned NewWidth, bool NewSign, 4311eb4433ac451dc16f4133a88af2d002ac26c58efMike Stump SourceLocation Loc, 432f4021e7d5228a2be5a380269dffa0331a6c78b95Chris Lattner unsigned DiagID) { 433f4021e7d5228a2be5a380269dffa0331a6c78b95Chris Lattner // Perform a conversion to the promoted condition type if needed. 434f4021e7d5228a2be5a380269dffa0331a6c78b95Chris Lattner if (NewWidth > Val.getBitWidth()) { 435f4021e7d5228a2be5a380269dffa0331a6c78b95Chris Lattner // If this is an extension, just do it. 4369f71a8f4c7a182a5236da9e747d57cc1d1bd24c2Jay Foad Val = Val.extend(NewWidth); 437f4021e7d5228a2be5a380269dffa0331a6c78b95Chris Lattner Val.setIsSigned(NewSign); 438f9f627dbbc62fbf51b906c24c783b4249dc7e9bbDouglas Gregor 439f9f627dbbc62fbf51b906c24c783b4249dc7e9bbDouglas Gregor // If the input was signed and negative and the output is 440f9f627dbbc62fbf51b906c24c783b4249dc7e9bbDouglas Gregor // unsigned, don't bother to warn: this is implementation-defined 441f9f627dbbc62fbf51b906c24c783b4249dc7e9bbDouglas Gregor // behavior. 442f9f627dbbc62fbf51b906c24c783b4249dc7e9bbDouglas Gregor // FIXME: Introduce a second, default-ignored warning for this case? 443f4021e7d5228a2be5a380269dffa0331a6c78b95Chris Lattner } else if (NewWidth < Val.getBitWidth()) { 444f4021e7d5228a2be5a380269dffa0331a6c78b95Chris Lattner // If this is a truncation, check for overflow. 445f4021e7d5228a2be5a380269dffa0331a6c78b95Chris Lattner llvm::APSInt ConvVal(Val); 4469f71a8f4c7a182a5236da9e747d57cc1d1bd24c2Jay Foad ConvVal = ConvVal.trunc(NewWidth); 447b2137ae3f1bd0aadb0552189af2824a324ffaa69Chris Lattner ConvVal.setIsSigned(NewSign); 4489f71a8f4c7a182a5236da9e747d57cc1d1bd24c2Jay Foad ConvVal = ConvVal.extend(Val.getBitWidth()); 449b2137ae3f1bd0aadb0552189af2824a324ffaa69Chris Lattner ConvVal.setIsSigned(Val.isSigned()); 450f4021e7d5228a2be5a380269dffa0331a6c78b95Chris Lattner if (ConvVal != Val) 451d3a94e24ddf3fb90de76b17bd176d9ed61e66f2cChris Lattner Diag(Loc, DiagID) << Val.toString(10) << ConvVal.toString(10); 4521eb4433ac451dc16f4133a88af2d002ac26c58efMike Stump 453f4021e7d5228a2be5a380269dffa0331a6c78b95Chris Lattner // Regardless of whether a diagnostic was emitted, really do the 454f4021e7d5228a2be5a380269dffa0331a6c78b95Chris Lattner // truncation. 4559f71a8f4c7a182a5236da9e747d57cc1d1bd24c2Jay Foad Val = Val.trunc(NewWidth); 456b2137ae3f1bd0aadb0552189af2824a324ffaa69Chris Lattner Val.setIsSigned(NewSign); 457f4021e7d5228a2be5a380269dffa0331a6c78b95Chris Lattner } else if (NewSign != Val.isSigned()) { 458f4021e7d5228a2be5a380269dffa0331a6c78b95Chris Lattner // Convert the sign to match the sign of the condition. This can cause 459f4021e7d5228a2be5a380269dffa0331a6c78b95Chris Lattner // overflow as well: unsigned(INTMIN) 460dfbb02a16ac8c764b5ba1742450513d6212d2f9fNAKAMURA Takumi // We don't diagnose this overflow, because it is implementation-defined 4612853eac24e2e70a74d7da817653b0528b976039fDouglas Gregor // behavior. 4622853eac24e2e70a74d7da817653b0528b976039fDouglas Gregor // FIXME: Introduce a second, default-ignored warning for this case? 463f4021e7d5228a2be5a380269dffa0331a6c78b95Chris Lattner llvm::APSInt OldVal(Val); 464f4021e7d5228a2be5a380269dffa0331a6c78b95Chris Lattner Val.setIsSigned(NewSign); 465f4021e7d5228a2be5a380269dffa0331a6c78b95Chris Lattner } 466f4021e7d5228a2be5a380269dffa0331a6c78b95Chris Lattner} 467f4021e7d5228a2be5a380269dffa0331a6c78b95Chris Lattner 4680471f5bc8191e39cdb61fabcaf1870e2af2d42e8Chris Lattnernamespace { 4690471f5bc8191e39cdb61fabcaf1870e2af2d42e8Chris Lattner struct CaseCompareFunctor { 4700471f5bc8191e39cdb61fabcaf1870e2af2d42e8Chris Lattner bool operator()(const std::pair<llvm::APSInt, CaseStmt*> &LHS, 4710471f5bc8191e39cdb61fabcaf1870e2af2d42e8Chris Lattner const llvm::APSInt &RHS) { 4720471f5bc8191e39cdb61fabcaf1870e2af2d42e8Chris Lattner return LHS.first < RHS; 4730471f5bc8191e39cdb61fabcaf1870e2af2d42e8Chris Lattner } 4740e85a2761ace912c66663d779dd230f88cf77fe0Chris Lattner bool operator()(const std::pair<llvm::APSInt, CaseStmt*> &LHS, 4750e85a2761ace912c66663d779dd230f88cf77fe0Chris Lattner const std::pair<llvm::APSInt, CaseStmt*> &RHS) { 4760e85a2761ace912c66663d779dd230f88cf77fe0Chris Lattner return LHS.first < RHS.first; 4770e85a2761ace912c66663d779dd230f88cf77fe0Chris Lattner } 4780471f5bc8191e39cdb61fabcaf1870e2af2d42e8Chris Lattner bool operator()(const llvm::APSInt &LHS, 4790471f5bc8191e39cdb61fabcaf1870e2af2d42e8Chris Lattner const std::pair<llvm::APSInt, CaseStmt*> &RHS) { 4800471f5bc8191e39cdb61fabcaf1870e2af2d42e8Chris Lattner return LHS < RHS.first; 4810471f5bc8191e39cdb61fabcaf1870e2af2d42e8Chris Lattner } 4820471f5bc8191e39cdb61fabcaf1870e2af2d42e8Chris Lattner }; 4830471f5bc8191e39cdb61fabcaf1870e2af2d42e8Chris Lattner} 4840471f5bc8191e39cdb61fabcaf1870e2af2d42e8Chris Lattner 485764a7ce5217f9569e100a3445f47496ee82daf86Chris Lattner/// CmpCaseVals - Comparison predicate for sorting case values. 486764a7ce5217f9569e100a3445f47496ee82daf86Chris Lattner/// 487764a7ce5217f9569e100a3445f47496ee82daf86Chris Lattnerstatic bool CmpCaseVals(const std::pair<llvm::APSInt, CaseStmt*>& lhs, 488764a7ce5217f9569e100a3445f47496ee82daf86Chris Lattner const std::pair<llvm::APSInt, CaseStmt*>& rhs) { 489764a7ce5217f9569e100a3445f47496ee82daf86Chris Lattner if (lhs.first < rhs.first) 490764a7ce5217f9569e100a3445f47496ee82daf86Chris Lattner return true; 491764a7ce5217f9569e100a3445f47496ee82daf86Chris Lattner 492764a7ce5217f9569e100a3445f47496ee82daf86Chris Lattner if (lhs.first == rhs.first && 493764a7ce5217f9569e100a3445f47496ee82daf86Chris Lattner lhs.second->getCaseLoc().getRawEncoding() 494764a7ce5217f9569e100a3445f47496ee82daf86Chris Lattner < rhs.second->getCaseLoc().getRawEncoding()) 495764a7ce5217f9569e100a3445f47496ee82daf86Chris Lattner return true; 496764a7ce5217f9569e100a3445f47496ee82daf86Chris Lattner return false; 497764a7ce5217f9569e100a3445f47496ee82daf86Chris Lattner} 498764a7ce5217f9569e100a3445f47496ee82daf86Chris Lattner 499ba915af51ced751c46e7c2b9c6f3b59d2e668825Douglas Gregor/// CmpEnumVals - Comparison predicate for sorting enumeration values. 500ba915af51ced751c46e7c2b9c6f3b59d2e668825Douglas Gregor/// 501ba915af51ced751c46e7c2b9c6f3b59d2e668825Douglas Gregorstatic bool CmpEnumVals(const std::pair<llvm::APSInt, EnumConstantDecl*>& lhs, 502ba915af51ced751c46e7c2b9c6f3b59d2e668825Douglas Gregor const std::pair<llvm::APSInt, EnumConstantDecl*>& rhs) 503ba915af51ced751c46e7c2b9c6f3b59d2e668825Douglas Gregor{ 504ba915af51ced751c46e7c2b9c6f3b59d2e668825Douglas Gregor return lhs.first < rhs.first; 505ba915af51ced751c46e7c2b9c6f3b59d2e668825Douglas Gregor} 506ba915af51ced751c46e7c2b9c6f3b59d2e668825Douglas Gregor 507ba915af51ced751c46e7c2b9c6f3b59d2e668825Douglas Gregor/// EqEnumVals - Comparison preficate for uniqing enumeration values. 508ba915af51ced751c46e7c2b9c6f3b59d2e668825Douglas Gregor/// 509ba915af51ced751c46e7c2b9c6f3b59d2e668825Douglas Gregorstatic bool EqEnumVals(const std::pair<llvm::APSInt, EnumConstantDecl*>& lhs, 510ba915af51ced751c46e7c2b9c6f3b59d2e668825Douglas Gregor const std::pair<llvm::APSInt, EnumConstantDecl*>& rhs) 511ba915af51ced751c46e7c2b9c6f3b59d2e668825Douglas Gregor{ 512ba915af51ced751c46e7c2b9c6f3b59d2e668825Douglas Gregor return lhs.first == rhs.first; 513ba915af51ced751c46e7c2b9c6f3b59d2e668825Douglas Gregor} 514ba915af51ced751c46e7c2b9c6f3b59d2e668825Douglas Gregor 5155f04881eb025f61396d0555d8173730fe2759e0aChris Lattner/// GetTypeBeforeIntegralPromotion - Returns the pre-promotion type of 5165f04881eb025f61396d0555d8173730fe2759e0aChris Lattner/// potentially integral-promoted expression @p expr. 517a8e0cd8cdecc7e0ba1792e46773b884c6eed4829John McCallstatic QualType GetTypeBeforeIntegralPromotion(Expr *&expr) { 518a8e0cd8cdecc7e0ba1792e46773b884c6eed4829John McCall if (ExprWithCleanups *cleanups = dyn_cast<ExprWithCleanups>(expr)) 519a8e0cd8cdecc7e0ba1792e46773b884c6eed4829John McCall expr = cleanups->getSubExpr(); 520a8e0cd8cdecc7e0ba1792e46773b884c6eed4829John McCall while (ImplicitCastExpr *impcast = dyn_cast<ImplicitCastExpr>(expr)) { 521a8e0cd8cdecc7e0ba1792e46773b884c6eed4829John McCall if (impcast->getCastKind() != CK_IntegralCast) break; 522a8e0cd8cdecc7e0ba1792e46773b884c6eed4829John McCall expr = impcast->getSubExpr(); 5235f04881eb025f61396d0555d8173730fe2759e0aChris Lattner } 5245f04881eb025f61396d0555d8173730fe2759e0aChris Lattner return expr->getType(); 5255f04881eb025f61396d0555d8173730fe2759e0aChris Lattner} 5265f04881eb025f61396d0555d8173730fe2759e0aChris Lattner 52760d7b3a319d84d688752be3870615ac0f111fb16John McCallStmtResult 528dfbb02a16ac8c764b5ba1742450513d6212d2f9fNAKAMURA TakumiSema::ActOnStartOfSwitchStmt(SourceLocation SwitchLoc, Expr *Cond, 529d226f65006733ed7f709c3174f22ce33391cb58fJohn McCall Decl *CondVar) { 53060d7b3a319d84d688752be3870615ac0f111fb16John McCall ExprResult CondResult; 5319ae2f076ca5ab1feb3ba95629099ec2319833701John McCall 532586596fd7f7a336a2847b300c80614dcf39ab6d5Douglas Gregor VarDecl *ConditionVar = 0; 533d226f65006733ed7f709c3174f22ce33391cb58fJohn McCall if (CondVar) { 534d226f65006733ed7f709c3174f22ce33391cb58fJohn McCall ConditionVar = cast<VarDecl>(CondVar); 5359ae2f076ca5ab1feb3ba95629099ec2319833701John McCall CondResult = CheckConditionVariable(ConditionVar, SourceLocation(), false); 5369ae2f076ca5ab1feb3ba95629099ec2319833701John McCall if (CondResult.isInvalid()) 537586596fd7f7a336a2847b300c80614dcf39ab6d5Douglas Gregor return StmtError(); 538dfbb02a16ac8c764b5ba1742450513d6212d2f9fNAKAMURA Takumi 5399ae2f076ca5ab1feb3ba95629099ec2319833701John McCall Cond = CondResult.release(); 540586596fd7f7a336a2847b300c80614dcf39ab6d5Douglas Gregor } 541dfbb02a16ac8c764b5ba1742450513d6212d2f9fNAKAMURA Takumi 5429ae2f076ca5ab1feb3ba95629099ec2319833701John McCall if (!Cond) 543586596fd7f7a336a2847b300c80614dcf39ab6d5Douglas Gregor return StmtError(); 544dfbb02a16ac8c764b5ba1742450513d6212d2f9fNAKAMURA Takumi 5459ae2f076ca5ab1feb3ba95629099ec2319833701John McCall CondResult 546dfbb02a16ac8c764b5ba1742450513d6212d2f9fNAKAMURA Takumi = ConvertToIntegralOrEnumerationType(SwitchLoc, Cond, 547c30614b7e2bad089f2509499379de509f33162d6Douglas Gregor PDiag(diag::err_typecheck_statement_requires_integer), 548c30614b7e2bad089f2509499379de509f33162d6Douglas Gregor PDiag(diag::err_switch_incomplete_class_type) 5499ae2f076ca5ab1feb3ba95629099ec2319833701John McCall << Cond->getSourceRange(), 550c30614b7e2bad089f2509499379de509f33162d6Douglas Gregor PDiag(diag::err_switch_explicit_conversion), 551c30614b7e2bad089f2509499379de509f33162d6Douglas Gregor PDiag(diag::note_switch_conversion), 552c30614b7e2bad089f2509499379de509f33162d6Douglas Gregor PDiag(diag::err_switch_multiple_conversions), 5536bc574daab3d3571d888cc4a21df67f2e2a14792Douglas Gregor PDiag(diag::note_switch_conversion), 5546bc574daab3d3571d888cc4a21df67f2e2a14792Douglas Gregor PDiag(0)); 5559ae2f076ca5ab1feb3ba95629099ec2319833701John McCall if (CondResult.isInvalid()) return StmtError(); 5569ae2f076ca5ab1feb3ba95629099ec2319833701John McCall Cond = CondResult.take(); 557dfbb02a16ac8c764b5ba1742450513d6212d2f9fNAKAMURA Takumi 558a8e0cd8cdecc7e0ba1792e46773b884c6eed4829John McCall // C99 6.8.4.2p5 - Integer promotions are performed on the controlling expr. 559a8e0cd8cdecc7e0ba1792e46773b884c6eed4829John McCall CondResult = UsualUnaryConversions(Cond); 560a8e0cd8cdecc7e0ba1792e46773b884c6eed4829John McCall if (CondResult.isInvalid()) return StmtError(); 561a8e0cd8cdecc7e0ba1792e46773b884c6eed4829John McCall Cond = CondResult.take(); 562a8e0cd8cdecc7e0ba1792e46773b884c6eed4829John McCall 563d226f65006733ed7f709c3174f22ce33391cb58fJohn McCall if (!CondVar) { 564b4eb64d8426c0eaa58d398961e0e74ff85063d7cJohn McCall CheckImplicitConversions(Cond, SwitchLoc); 5654765fa05b5652fcc4356371c2f481d0ea9a1b007John McCall CondResult = MaybeCreateExprWithCleanups(Cond); 5669ae2f076ca5ab1feb3ba95629099ec2319833701John McCall if (CondResult.isInvalid()) 567586596fd7f7a336a2847b300c80614dcf39ab6d5Douglas Gregor return StmtError(); 5689ae2f076ca5ab1feb3ba95629099ec2319833701John McCall Cond = CondResult.take(); 569586596fd7f7a336a2847b300c80614dcf39ab6d5Douglas Gregor } 570b60a77e453d32db0ab1914d28e175c2defc0eb65John McCall 571781472fe99a120098c631b0cbe33c89f8cef5e70John McCall getCurFunction()->setHasBranchIntoScope(); 572dfbb02a16ac8c764b5ba1742450513d6212d2f9fNAKAMURA Takumi 5739ae2f076ca5ab1feb3ba95629099ec2319833701John McCall SwitchStmt *SS = new (Context) SwitchStmt(Context, ConditionVar, Cond); 574781472fe99a120098c631b0cbe33c89f8cef5e70John McCall getCurFunction()->SwitchStack.push_back(SS); 575586596fd7f7a336a2847b300c80614dcf39ab6d5Douglas Gregor return Owned(SS); 5767e52de4b45286d057b367bb1f9283a1e32d79252Chris Lattner} 5777e52de4b45286d057b367bb1f9283a1e32d79252Chris Lattner 57828164ab2ac1deea68cdb989f941728bf1860ce41Gabor Greifstatic void AdjustAPSInt(llvm::APSInt &Val, unsigned BitWidth, bool IsSigned) { 57928164ab2ac1deea68cdb989f941728bf1860ce41Gabor Greif if (Val.getBitWidth() < BitWidth) 5809f71a8f4c7a182a5236da9e747d57cc1d1bd24c2Jay Foad Val = Val.extend(BitWidth); 58128164ab2ac1deea68cdb989f941728bf1860ce41Gabor Greif else if (Val.getBitWidth() > BitWidth) 5829f71a8f4c7a182a5236da9e747d57cc1d1bd24c2Jay Foad Val = Val.trunc(BitWidth); 58328164ab2ac1deea68cdb989f941728bf1860ce41Gabor Greif Val.setIsSigned(IsSigned); 58428164ab2ac1deea68cdb989f941728bf1860ce41Gabor Greif} 58528164ab2ac1deea68cdb989f941728bf1860ce41Gabor Greif 58660d7b3a319d84d688752be3870615ac0f111fb16John McCallStmtResult 5879ae2f076ca5ab1feb3ba95629099ec2319833701John McCallSema::ActOnFinishSwitchStmt(SourceLocation SwitchLoc, Stmt *Switch, 5889ae2f076ca5ab1feb3ba95629099ec2319833701John McCall Stmt *BodyStmt) { 5899ae2f076ca5ab1feb3ba95629099ec2319833701John McCall SwitchStmt *SS = cast<SwitchStmt>(Switch); 590781472fe99a120098c631b0cbe33c89f8cef5e70John McCall assert(SS == getCurFunction()->SwitchStack.back() && 591781472fe99a120098c631b0cbe33c89f8cef5e70John McCall "switch stack missing push/pop!"); 592de307473448fb3cebcb4c10090728300b53bca03Sebastian Redl 5939dcbfa450d751bd68fc4af8b75da381d4f6984b9Steve Naroff SS->setBody(BodyStmt, SwitchLoc); 594781472fe99a120098c631b0cbe33c89f8cef5e70John McCall getCurFunction()->SwitchStack.pop_back(); 595c1fcb7762673be706b0a40477d5e93411e918f93Anders Carlsson 596f4021e7d5228a2be5a380269dffa0331a6c78b95Chris Lattner Expr *CondExpr = SS->getCond(); 597a8e0cd8cdecc7e0ba1792e46773b884c6eed4829John McCall if (!CondExpr) return StmtError(); 598de307473448fb3cebcb4c10090728300b53bca03Sebastian Redl 599a0d3ca1ea5578bc736bb71bcec50ab41fefc87b9Douglas Gregor QualType CondType = CondExpr->getType(); 600a8e0cd8cdecc7e0ba1792e46773b884c6eed4829John McCall 601a8e0cd8cdecc7e0ba1792e46773b884c6eed4829John McCall Expr *CondExprBeforePromotion = CondExpr; 602a8e0cd8cdecc7e0ba1792e46773b884c6eed4829John McCall QualType CondTypeBeforePromotion = 603a8e0cd8cdecc7e0ba1792e46773b884c6eed4829John McCall GetTypeBeforeIntegralPromotion(CondExprBeforePromotion); 60484fb9c0be621c9e4ca4e56f67dae2a0bb6e44821Douglas Gregor 6055f04881eb025f61396d0555d8173730fe2759e0aChris Lattner // C++ 6.4.2.p2: 6065f04881eb025f61396d0555d8173730fe2759e0aChris Lattner // Integral promotions are performed (on the switch condition). 6075f04881eb025f61396d0555d8173730fe2759e0aChris Lattner // 6085f04881eb025f61396d0555d8173730fe2759e0aChris Lattner // A case value unrepresentable by the original switch condition 6095f04881eb025f61396d0555d8173730fe2759e0aChris Lattner // type (before the promotion) doesn't make sense, even when it can 6105f04881eb025f61396d0555d8173730fe2759e0aChris Lattner // be represented by the promoted type. Therefore we need to find 6115f04881eb025f61396d0555d8173730fe2759e0aChris Lattner // the pre-promotion type of the switch condition. 61212356b119032edd64e9c32f9f01920d12c2acc57Edward O'Callaghan if (!CondExpr->isTypeDependent()) { 613acb0bd85d30ecacbe872ca9d9cfac5d7b6038a43Douglas Gregor // We have already converted the expression to an integral or enumeration 614dfbb02a16ac8c764b5ba1742450513d6212d2f9fNAKAMURA Takumi // type, when we started the switch statement. If we don't have an 615acb0bd85d30ecacbe872ca9d9cfac5d7b6038a43Douglas Gregor // appropriate type now, just return an error. 616acb0bd85d30ecacbe872ca9d9cfac5d7b6038a43Douglas Gregor if (!CondType->isIntegralOrEnumerationType()) 61712356b119032edd64e9c32f9f01920d12c2acc57Edward O'Callaghan return StmtError(); 61812356b119032edd64e9c32f9f01920d12c2acc57Edward O'Callaghan 6192b334bb3126a67895813e49e6228dad4aec0b4d6Chris Lattner if (CondExpr->isKnownToHaveBooleanValue()) { 62012356b119032edd64e9c32f9f01920d12c2acc57Edward O'Callaghan // switch(bool_expr) {...} is often a programmer error, e.g. 62112356b119032edd64e9c32f9f01920d12c2acc57Edward O'Callaghan // switch(n && mask) { ... } // Doh - should be "n & mask". 62212356b119032edd64e9c32f9f01920d12c2acc57Edward O'Callaghan // One can always use an if statement instead of switch(bool_expr). 62312356b119032edd64e9c32f9f01920d12c2acc57Edward O'Callaghan Diag(SwitchLoc, diag::warn_bool_switch_condition) 62412356b119032edd64e9c32f9f01920d12c2acc57Edward O'Callaghan << CondExpr->getSourceRange(); 62512356b119032edd64e9c32f9f01920d12c2acc57Edward O'Callaghan } 626c1fcb7762673be706b0a40477d5e93411e918f93Anders Carlsson } 627de307473448fb3cebcb4c10090728300b53bca03Sebastian Redl 628f4021e7d5228a2be5a380269dffa0331a6c78b95Chris Lattner // Get the bitwidth of the switched-on value before promotions. We must 629f4021e7d5228a2be5a380269dffa0331a6c78b95Chris Lattner // convert the integer case values to this width before comparison. 6301eb4433ac451dc16f4133a88af2d002ac26c58efMike Stump bool HasDependentValue 631dbb26db1d426fb6caaaf1b4fa47b46d1947c12c9Douglas Gregor = CondExpr->isTypeDependent() || CondExpr->isValueDependent(); 6321eb4433ac451dc16f4133a88af2d002ac26c58efMike Stump unsigned CondWidth 6331d6ab7af99a1fc059a6aa5da083640c1d94b07f7Chris Lattner = HasDependentValue ? 0 : Context.getIntWidth(CondTypeBeforePromotion); 634575a1c9dc8dc5b4977194993e289f9eda7295c39Douglas Gregor bool CondIsSigned 635575a1c9dc8dc5b4977194993e289f9eda7295c39Douglas Gregor = CondTypeBeforePromotion->isSignedIntegerOrEnumerationType(); 6361eb4433ac451dc16f4133a88af2d002ac26c58efMike Stump 637f4021e7d5228a2be5a380269dffa0331a6c78b95Chris Lattner // Accumulate all of the case values in a vector so that we can sort them 638f4021e7d5228a2be5a380269dffa0331a6c78b95Chris Lattner // and detect duplicates. This vector contains the APInt for the case after 639f4021e7d5228a2be5a380269dffa0331a6c78b95Chris Lattner // it has been converted to the condition type. 6405f9e272e632e951b1efe824cd16acb4d96077930Chris Lattner typedef SmallVector<std::pair<llvm::APSInt, CaseStmt*>, 64> CaseValsTy; 6410471f5bc8191e39cdb61fabcaf1870e2af2d42e8Chris Lattner CaseValsTy CaseVals; 6421eb4433ac451dc16f4133a88af2d002ac26c58efMike Stump 643f4021e7d5228a2be5a380269dffa0331a6c78b95Chris Lattner // Keep track of any GNU case ranges we see. The APSInt is the low value. 644ba915af51ced751c46e7c2b9c6f3b59d2e668825Douglas Gregor typedef std::vector<std::pair<llvm::APSInt, CaseStmt*> > CaseRangesTy; 645ba915af51ced751c46e7c2b9c6f3b59d2e668825Douglas Gregor CaseRangesTy CaseRanges; 6461eb4433ac451dc16f4133a88af2d002ac26c58efMike Stump 647f4021e7d5228a2be5a380269dffa0331a6c78b95Chris Lattner DefaultStmt *TheDefaultStmt = 0; 6481eb4433ac451dc16f4133a88af2d002ac26c58efMike Stump 649b2ec9d6fede9cccc170a202de7bf7f523dea8be4Chris Lattner bool CaseListIsErroneous = false; 6501eb4433ac451dc16f4133a88af2d002ac26c58efMike Stump 651dbb26db1d426fb6caaaf1b4fa47b46d1947c12c9Douglas Gregor for (SwitchCase *SC = SS->getSwitchCaseList(); SC && !HasDependentValue; 652c1fcb7762673be706b0a40477d5e93411e918f93Anders Carlsson SC = SC->getNextSwitchCase()) { 6531eb4433ac451dc16f4133a88af2d002ac26c58efMike Stump 654c1fcb7762673be706b0a40477d5e93411e918f93Anders Carlsson if (DefaultStmt *DS = dyn_cast<DefaultStmt>(SC)) { 655f4021e7d5228a2be5a380269dffa0331a6c78b95Chris Lattner if (TheDefaultStmt) { 656f4021e7d5228a2be5a380269dffa0331a6c78b95Chris Lattner Diag(DS->getDefaultLoc(), diag::err_multiple_default_labels_defined); 6575f4a6829dc58cab2f76e2b98492859aa3b91e3f2Chris Lattner Diag(TheDefaultStmt->getDefaultLoc(), diag::note_duplicate_case_prev); 658de307473448fb3cebcb4c10090728300b53bca03Sebastian Redl 659f4021e7d5228a2be5a380269dffa0331a6c78b95Chris Lattner // FIXME: Remove the default statement from the switch block so that 660390b4cc8b45a05612349269ef08faab3e4688f06Mike Stump // we'll return a valid AST. This requires recursing down the AST and 661390b4cc8b45a05612349269ef08faab3e4688f06Mike Stump // finding it, not something we are set up to do right now. For now, 662390b4cc8b45a05612349269ef08faab3e4688f06Mike Stump // just lop the entire switch stmt out of the AST. 663b2ec9d6fede9cccc170a202de7bf7f523dea8be4Chris Lattner CaseListIsErroneous = true; 664c1fcb7762673be706b0a40477d5e93411e918f93Anders Carlsson } 665f4021e7d5228a2be5a380269dffa0331a6c78b95Chris Lattner TheDefaultStmt = DS; 6661eb4433ac451dc16f4133a88af2d002ac26c58efMike Stump 667f4021e7d5228a2be5a380269dffa0331a6c78b95Chris Lattner } else { 668f4021e7d5228a2be5a380269dffa0331a6c78b95Chris Lattner CaseStmt *CS = cast<CaseStmt>(SC); 6691eb4433ac451dc16f4133a88af2d002ac26c58efMike Stump 670f4021e7d5228a2be5a380269dffa0331a6c78b95Chris Lattner // We already verified that the expression has a i-c-e value (C99 671f4021e7d5228a2be5a380269dffa0331a6c78b95Chris Lattner // 6.8.4.2p3) - get that value now. 6721e0a39012467b4f409142c32148036a9ee05e1d7Chris Lattner Expr *Lo = CS->getLHS(); 673dbb26db1d426fb6caaaf1b4fa47b46d1947c12c9Douglas Gregor 674dbb26db1d426fb6caaaf1b4fa47b46d1947c12c9Douglas Gregor if (Lo->isTypeDependent() || Lo->isValueDependent()) { 675dbb26db1d426fb6caaaf1b4fa47b46d1947c12c9Douglas Gregor HasDependentValue = true; 676dbb26db1d426fb6caaaf1b4fa47b46d1947c12c9Douglas Gregor break; 677dbb26db1d426fb6caaaf1b4fa47b46d1947c12c9Douglas Gregor } 6781eb4433ac451dc16f4133a88af2d002ac26c58efMike Stump 67951fe996231b1d7199f76e4005ff4c943d5deeecdAnders Carlsson llvm::APSInt LoVal = Lo->EvaluateAsInt(Context); 6801eb4433ac451dc16f4133a88af2d002ac26c58efMike Stump 681f4021e7d5228a2be5a380269dffa0331a6c78b95Chris Lattner // Convert the value to the same width/sign as the condition. 682f4021e7d5228a2be5a380269dffa0331a6c78b95Chris Lattner ConvertIntegerToTypeWarnOnOverflow(LoVal, CondWidth, CondIsSigned, 68328164ab2ac1deea68cdb989f941728bf1860ce41Gabor Greif Lo->getLocStart(), 684f4021e7d5228a2be5a380269dffa0331a6c78b95Chris Lattner diag::warn_case_value_overflow); 6856c36be5b383875b490684bcf439d6d427298c1afChris Lattner 6861e0a39012467b4f409142c32148036a9ee05e1d7Chris Lattner // If the LHS is not the same type as the condition, insert an implicit 6871e0a39012467b4f409142c32148036a9ee05e1d7Chris Lattner // cast. 688429bb276991ff2dbc7c5b438828b9b7737cb15ebJohn Wiegley Lo = ImpCastExprToType(Lo, CondType, CK_IntegralCast).take(); 6891e0a39012467b4f409142c32148036a9ee05e1d7Chris Lattner CS->setLHS(Lo); 6901eb4433ac451dc16f4133a88af2d002ac26c58efMike Stump 691b2ec9d6fede9cccc170a202de7bf7f523dea8be4Chris Lattner // If this is a case range, remember it in CaseRanges, otherwise CaseVals. 692dbb26db1d426fb6caaaf1b4fa47b46d1947c12c9Douglas Gregor if (CS->getRHS()) { 6931eb4433ac451dc16f4133a88af2d002ac26c58efMike Stump if (CS->getRHS()->isTypeDependent() || 694dbb26db1d426fb6caaaf1b4fa47b46d1947c12c9Douglas Gregor CS->getRHS()->isValueDependent()) { 695dbb26db1d426fb6caaaf1b4fa47b46d1947c12c9Douglas Gregor HasDependentValue = true; 696dbb26db1d426fb6caaaf1b4fa47b46d1947c12c9Douglas Gregor break; 697dbb26db1d426fb6caaaf1b4fa47b46d1947c12c9Douglas Gregor } 698f4021e7d5228a2be5a380269dffa0331a6c78b95Chris Lattner CaseRanges.push_back(std::make_pair(LoVal, CS)); 6991eb4433ac451dc16f4133a88af2d002ac26c58efMike Stump } else 700b2ec9d6fede9cccc170a202de7bf7f523dea8be4Chris Lattner CaseVals.push_back(std::make_pair(LoVal, CS)); 701f4021e7d5228a2be5a380269dffa0331a6c78b95Chris Lattner } 702f4021e7d5228a2be5a380269dffa0331a6c78b95Chris Lattner } 703b2ec9d6fede9cccc170a202de7bf7f523dea8be4Chris Lattner 704dbb26db1d426fb6caaaf1b4fa47b46d1947c12c9Douglas Gregor if (!HasDependentValue) { 7050fb97083cc0f8a82e404e22991ae80d2216e71d5John McCall // If we don't have a default statement, check whether the 7060fb97083cc0f8a82e404e22991ae80d2216e71d5John McCall // condition is constant. 7070fb97083cc0f8a82e404e22991ae80d2216e71d5John McCall llvm::APSInt ConstantCondValue; 7080fb97083cc0f8a82e404e22991ae80d2216e71d5John McCall bool HasConstantCond = false; 7090fb97083cc0f8a82e404e22991ae80d2216e71d5John McCall bool ShouldCheckConstantCond = false; 7100fb97083cc0f8a82e404e22991ae80d2216e71d5John McCall if (!HasDependentValue && !TheDefaultStmt) { 7110fb97083cc0f8a82e404e22991ae80d2216e71d5John McCall Expr::EvalResult Result; 7120fb97083cc0f8a82e404e22991ae80d2216e71d5John McCall HasConstantCond = CondExprBeforePromotion->Evaluate(Result, Context); 7130fb97083cc0f8a82e404e22991ae80d2216e71d5John McCall if (HasConstantCond) { 7140fb97083cc0f8a82e404e22991ae80d2216e71d5John McCall assert(Result.Val.isInt() && "switch condition evaluated to non-int"); 7150fb97083cc0f8a82e404e22991ae80d2216e71d5John McCall ConstantCondValue = Result.Val.getInt(); 7160fb97083cc0f8a82e404e22991ae80d2216e71d5John McCall ShouldCheckConstantCond = true; 7170fb97083cc0f8a82e404e22991ae80d2216e71d5John McCall 7180fb97083cc0f8a82e404e22991ae80d2216e71d5John McCall assert(ConstantCondValue.getBitWidth() == CondWidth && 7190fb97083cc0f8a82e404e22991ae80d2216e71d5John McCall ConstantCondValue.isSigned() == CondIsSigned); 7200fb97083cc0f8a82e404e22991ae80d2216e71d5John McCall } 7210fb97083cc0f8a82e404e22991ae80d2216e71d5John McCall } 7220fb97083cc0f8a82e404e22991ae80d2216e71d5John McCall 723dbb26db1d426fb6caaaf1b4fa47b46d1947c12c9Douglas Gregor // Sort all the scalar case values so we can easily detect duplicates. 724dbb26db1d426fb6caaaf1b4fa47b46d1947c12c9Douglas Gregor std::stable_sort(CaseVals.begin(), CaseVals.end(), CmpCaseVals); 725dbb26db1d426fb6caaaf1b4fa47b46d1947c12c9Douglas Gregor 726dbb26db1d426fb6caaaf1b4fa47b46d1947c12c9Douglas Gregor if (!CaseVals.empty()) { 7270fb97083cc0f8a82e404e22991ae80d2216e71d5John McCall for (unsigned i = 0, e = CaseVals.size(); i != e; ++i) { 7280fb97083cc0f8a82e404e22991ae80d2216e71d5John McCall if (ShouldCheckConstantCond && 7290fb97083cc0f8a82e404e22991ae80d2216e71d5John McCall CaseVals[i].first == ConstantCondValue) 7300fb97083cc0f8a82e404e22991ae80d2216e71d5John McCall ShouldCheckConstantCond = false; 7310fb97083cc0f8a82e404e22991ae80d2216e71d5John McCall 7320fb97083cc0f8a82e404e22991ae80d2216e71d5John McCall if (i != 0 && CaseVals[i].first == CaseVals[i-1].first) { 733dbb26db1d426fb6caaaf1b4fa47b46d1947c12c9Douglas Gregor // If we have a duplicate, report it. 7341eb4433ac451dc16f4133a88af2d002ac26c58efMike Stump Diag(CaseVals[i].second->getLHS()->getLocStart(), 7350fb97083cc0f8a82e404e22991ae80d2216e71d5John McCall diag::err_duplicate_case) << CaseVals[i].first.toString(10); 7360fb97083cc0f8a82e404e22991ae80d2216e71d5John McCall Diag(CaseVals[i-1].second->getLHS()->getLocStart(), 737dbb26db1d426fb6caaaf1b4fa47b46d1947c12c9Douglas Gregor diag::note_duplicate_case_prev); 738390b4cc8b45a05612349269ef08faab3e4688f06Mike Stump // FIXME: We really want to remove the bogus case stmt from the 739390b4cc8b45a05612349269ef08faab3e4688f06Mike Stump // substmt, but we have no way to do this right now. 740dbb26db1d426fb6caaaf1b4fa47b46d1947c12c9Douglas Gregor CaseListIsErroneous = true; 741dbb26db1d426fb6caaaf1b4fa47b46d1947c12c9Douglas Gregor } 7426efc4d3659632ddcea4a58cb62e9ee54ca4a373eChris Lattner } 743b2ec9d6fede9cccc170a202de7bf7f523dea8be4Chris Lattner } 7441eb4433ac451dc16f4133a88af2d002ac26c58efMike Stump 745dbb26db1d426fb6caaaf1b4fa47b46d1947c12c9Douglas Gregor // Detect duplicate case ranges, which usually don't exist at all in 746dbb26db1d426fb6caaaf1b4fa47b46d1947c12c9Douglas Gregor // the first place. 747dbb26db1d426fb6caaaf1b4fa47b46d1947c12c9Douglas Gregor if (!CaseRanges.empty()) { 748dbb26db1d426fb6caaaf1b4fa47b46d1947c12c9Douglas Gregor // Sort all the case ranges by their low value so we can easily detect 749dbb26db1d426fb6caaaf1b4fa47b46d1947c12c9Douglas Gregor // overlaps between ranges. 750dbb26db1d426fb6caaaf1b4fa47b46d1947c12c9Douglas Gregor std::stable_sort(CaseRanges.begin(), CaseRanges.end()); 7511eb4433ac451dc16f4133a88af2d002ac26c58efMike Stump 752dbb26db1d426fb6caaaf1b4fa47b46d1947c12c9Douglas Gregor // Scan the ranges, computing the high values and removing empty ranges. 753dbb26db1d426fb6caaaf1b4fa47b46d1947c12c9Douglas Gregor std::vector<llvm::APSInt> HiVals; 754dbb26db1d426fb6caaaf1b4fa47b46d1947c12c9Douglas Gregor for (unsigned i = 0, e = CaseRanges.size(); i != e; ++i) { 7550fb97083cc0f8a82e404e22991ae80d2216e71d5John McCall llvm::APSInt &LoVal = CaseRanges[i].first; 756dbb26db1d426fb6caaaf1b4fa47b46d1947c12c9Douglas Gregor CaseStmt *CR = CaseRanges[i].second; 757dbb26db1d426fb6caaaf1b4fa47b46d1947c12c9Douglas Gregor Expr *Hi = CR->getRHS(); 758dbb26db1d426fb6caaaf1b4fa47b46d1947c12c9Douglas Gregor llvm::APSInt HiVal = Hi->EvaluateAsInt(Context); 7591eb4433ac451dc16f4133a88af2d002ac26c58efMike Stump 760dbb26db1d426fb6caaaf1b4fa47b46d1947c12c9Douglas Gregor // Convert the value to the same width/sign as the condition. 761dbb26db1d426fb6caaaf1b4fa47b46d1947c12c9Douglas Gregor ConvertIntegerToTypeWarnOnOverflow(HiVal, CondWidth, CondIsSigned, 76228164ab2ac1deea68cdb989f941728bf1860ce41Gabor Greif Hi->getLocStart(), 763dbb26db1d426fb6caaaf1b4fa47b46d1947c12c9Douglas Gregor diag::warn_case_value_overflow); 7641eb4433ac451dc16f4133a88af2d002ac26c58efMike Stump 765dbb26db1d426fb6caaaf1b4fa47b46d1947c12c9Douglas Gregor // If the LHS is not the same type as the condition, insert an implicit 766dbb26db1d426fb6caaaf1b4fa47b46d1947c12c9Douglas Gregor // cast. 767429bb276991ff2dbc7c5b438828b9b7737cb15ebJohn Wiegley Hi = ImpCastExprToType(Hi, CondType, CK_IntegralCast).take(); 768dbb26db1d426fb6caaaf1b4fa47b46d1947c12c9Douglas Gregor CR->setRHS(Hi); 7691eb4433ac451dc16f4133a88af2d002ac26c58efMike Stump 770dbb26db1d426fb6caaaf1b4fa47b46d1947c12c9Douglas Gregor // If the low value is bigger than the high value, the case is empty. 7710fb97083cc0f8a82e404e22991ae80d2216e71d5John McCall if (LoVal > HiVal) { 772dbb26db1d426fb6caaaf1b4fa47b46d1947c12c9Douglas Gregor Diag(CR->getLHS()->getLocStart(), diag::warn_case_empty_range) 773dbb26db1d426fb6caaaf1b4fa47b46d1947c12c9Douglas Gregor << SourceRange(CR->getLHS()->getLocStart(), 77428164ab2ac1deea68cdb989f941728bf1860ce41Gabor Greif Hi->getLocEnd()); 775dbb26db1d426fb6caaaf1b4fa47b46d1947c12c9Douglas Gregor CaseRanges.erase(CaseRanges.begin()+i); 776dbb26db1d426fb6caaaf1b4fa47b46d1947c12c9Douglas Gregor --i, --e; 777dbb26db1d426fb6caaaf1b4fa47b46d1947c12c9Douglas Gregor continue; 778dbb26db1d426fb6caaaf1b4fa47b46d1947c12c9Douglas Gregor } 7790fb97083cc0f8a82e404e22991ae80d2216e71d5John McCall 7800fb97083cc0f8a82e404e22991ae80d2216e71d5John McCall if (ShouldCheckConstantCond && 7810fb97083cc0f8a82e404e22991ae80d2216e71d5John McCall LoVal <= ConstantCondValue && 7820fb97083cc0f8a82e404e22991ae80d2216e71d5John McCall ConstantCondValue <= HiVal) 7830fb97083cc0f8a82e404e22991ae80d2216e71d5John McCall ShouldCheckConstantCond = false; 7840fb97083cc0f8a82e404e22991ae80d2216e71d5John McCall 785dbb26db1d426fb6caaaf1b4fa47b46d1947c12c9Douglas Gregor HiVals.push_back(HiVal); 7860471f5bc8191e39cdb61fabcaf1870e2af2d42e8Chris Lattner } 7871eb4433ac451dc16f4133a88af2d002ac26c58efMike Stump 788dbb26db1d426fb6caaaf1b4fa47b46d1947c12c9Douglas Gregor // Rescan the ranges, looking for overlap with singleton values and other 789dbb26db1d426fb6caaaf1b4fa47b46d1947c12c9Douglas Gregor // ranges. Since the range list is sorted, we only need to compare case 790dbb26db1d426fb6caaaf1b4fa47b46d1947c12c9Douglas Gregor // ranges with their neighbors. 791dbb26db1d426fb6caaaf1b4fa47b46d1947c12c9Douglas Gregor for (unsigned i = 0, e = CaseRanges.size(); i != e; ++i) { 792dbb26db1d426fb6caaaf1b4fa47b46d1947c12c9Douglas Gregor llvm::APSInt &CRLo = CaseRanges[i].first; 793dbb26db1d426fb6caaaf1b4fa47b46d1947c12c9Douglas Gregor llvm::APSInt &CRHi = HiVals[i]; 794dbb26db1d426fb6caaaf1b4fa47b46d1947c12c9Douglas Gregor CaseStmt *CR = CaseRanges[i].second; 7951eb4433ac451dc16f4133a88af2d002ac26c58efMike Stump 796dbb26db1d426fb6caaaf1b4fa47b46d1947c12c9Douglas Gregor // Check to see whether the case range overlaps with any 797dbb26db1d426fb6caaaf1b4fa47b46d1947c12c9Douglas Gregor // singleton cases. 798dbb26db1d426fb6caaaf1b4fa47b46d1947c12c9Douglas Gregor CaseStmt *OverlapStmt = 0; 799dbb26db1d426fb6caaaf1b4fa47b46d1947c12c9Douglas Gregor llvm::APSInt OverlapVal(32); 8001eb4433ac451dc16f4133a88af2d002ac26c58efMike Stump 801dbb26db1d426fb6caaaf1b4fa47b46d1947c12c9Douglas Gregor // Find the smallest value >= the lower bound. If I is in the 802dbb26db1d426fb6caaaf1b4fa47b46d1947c12c9Douglas Gregor // case range, then we have overlap. 803dbb26db1d426fb6caaaf1b4fa47b46d1947c12c9Douglas Gregor CaseValsTy::iterator I = std::lower_bound(CaseVals.begin(), 804dbb26db1d426fb6caaaf1b4fa47b46d1947c12c9Douglas Gregor CaseVals.end(), CRLo, 805dbb26db1d426fb6caaaf1b4fa47b46d1947c12c9Douglas Gregor CaseCompareFunctor()); 806dbb26db1d426fb6caaaf1b4fa47b46d1947c12c9Douglas Gregor if (I != CaseVals.end() && I->first < CRHi) { 807dbb26db1d426fb6caaaf1b4fa47b46d1947c12c9Douglas Gregor OverlapVal = I->first; // Found overlap with scalar. 808dbb26db1d426fb6caaaf1b4fa47b46d1947c12c9Douglas Gregor OverlapStmt = I->second; 809dbb26db1d426fb6caaaf1b4fa47b46d1947c12c9Douglas Gregor } 8101eb4433ac451dc16f4133a88af2d002ac26c58efMike Stump 811dbb26db1d426fb6caaaf1b4fa47b46d1947c12c9Douglas Gregor // Find the smallest value bigger than the upper bound. 812dbb26db1d426fb6caaaf1b4fa47b46d1947c12c9Douglas Gregor I = std::upper_bound(I, CaseVals.end(), CRHi, CaseCompareFunctor()); 813dbb26db1d426fb6caaaf1b4fa47b46d1947c12c9Douglas Gregor if (I != CaseVals.begin() && (I-1)->first >= CRLo) { 814dbb26db1d426fb6caaaf1b4fa47b46d1947c12c9Douglas Gregor OverlapVal = (I-1)->first; // Found overlap with scalar. 815dbb26db1d426fb6caaaf1b4fa47b46d1947c12c9Douglas Gregor OverlapStmt = (I-1)->second; 816dbb26db1d426fb6caaaf1b4fa47b46d1947c12c9Douglas Gregor } 8171eb4433ac451dc16f4133a88af2d002ac26c58efMike Stump 818dbb26db1d426fb6caaaf1b4fa47b46d1947c12c9Douglas Gregor // Check to see if this case stmt overlaps with the subsequent 819dbb26db1d426fb6caaaf1b4fa47b46d1947c12c9Douglas Gregor // case range. 820dbb26db1d426fb6caaaf1b4fa47b46d1947c12c9Douglas Gregor if (i && CRLo <= HiVals[i-1]) { 821dbb26db1d426fb6caaaf1b4fa47b46d1947c12c9Douglas Gregor OverlapVal = HiVals[i-1]; // Found overlap with range. 822dbb26db1d426fb6caaaf1b4fa47b46d1947c12c9Douglas Gregor OverlapStmt = CaseRanges[i-1].second; 823dbb26db1d426fb6caaaf1b4fa47b46d1947c12c9Douglas Gregor } 8241eb4433ac451dc16f4133a88af2d002ac26c58efMike Stump 825dbb26db1d426fb6caaaf1b4fa47b46d1947c12c9Douglas Gregor if (OverlapStmt) { 826dbb26db1d426fb6caaaf1b4fa47b46d1947c12c9Douglas Gregor // If we have a duplicate, report it. 827dbb26db1d426fb6caaaf1b4fa47b46d1947c12c9Douglas Gregor Diag(CR->getLHS()->getLocStart(), diag::err_duplicate_case) 828dbb26db1d426fb6caaaf1b4fa47b46d1947c12c9Douglas Gregor << OverlapVal.toString(10); 8291eb4433ac451dc16f4133a88af2d002ac26c58efMike Stump Diag(OverlapStmt->getLHS()->getLocStart(), 830dbb26db1d426fb6caaaf1b4fa47b46d1947c12c9Douglas Gregor diag::note_duplicate_case_prev); 831390b4cc8b45a05612349269ef08faab3e4688f06Mike Stump // FIXME: We really want to remove the bogus case stmt from the 832390b4cc8b45a05612349269ef08faab3e4688f06Mike Stump // substmt, but we have no way to do this right now. 833dbb26db1d426fb6caaaf1b4fa47b46d1947c12c9Douglas Gregor CaseListIsErroneous = true; 834dbb26db1d426fb6caaaf1b4fa47b46d1947c12c9Douglas Gregor } 8350471f5bc8191e39cdb61fabcaf1870e2af2d42e8Chris Lattner } 836b2ec9d6fede9cccc170a202de7bf7f523dea8be4Chris Lattner } 837ba915af51ced751c46e7c2b9c6f3b59d2e668825Douglas Gregor 8380fb97083cc0f8a82e404e22991ae80d2216e71d5John McCall // Complain if we have a constant condition and we didn't find a match. 8390fb97083cc0f8a82e404e22991ae80d2216e71d5John McCall if (!CaseListIsErroneous && ShouldCheckConstantCond) { 8400fb97083cc0f8a82e404e22991ae80d2216e71d5John McCall // TODO: it would be nice if we printed enums as enums, chars as 8410fb97083cc0f8a82e404e22991ae80d2216e71d5John McCall // chars, etc. 8420fb97083cc0f8a82e404e22991ae80d2216e71d5John McCall Diag(CondExpr->getExprLoc(), diag::warn_missing_case_for_condition) 8430fb97083cc0f8a82e404e22991ae80d2216e71d5John McCall << ConstantCondValue.toString(10) 8440fb97083cc0f8a82e404e22991ae80d2216e71d5John McCall << CondExpr->getSourceRange(); 8450fb97083cc0f8a82e404e22991ae80d2216e71d5John McCall } 8460fb97083cc0f8a82e404e22991ae80d2216e71d5John McCall 8470fb97083cc0f8a82e404e22991ae80d2216e71d5John McCall // Check to see if switch is over an Enum and handles all of its 848559fb554602bedb57dbbf3cc14ac8a38264b4547Ted Kremenek // values. We only issue a warning if there is not 'default:', but 849559fb554602bedb57dbbf3cc14ac8a38264b4547Ted Kremenek // we still do the analysis to preserve this information in the AST 850559fb554602bedb57dbbf3cc14ac8a38264b4547Ted Kremenek // (which can be used by flow-based analyes). 8510fb97083cc0f8a82e404e22991ae80d2216e71d5John McCall // 852ce78461303f45fecb3460d1c49c9b71f27ad19c3Chris Lattner const EnumType *ET = CondTypeBeforePromotion->getAs<EnumType>(); 853559fb554602bedb57dbbf3cc14ac8a38264b4547Ted Kremenek 854ba915af51ced751c46e7c2b9c6f3b59d2e668825Douglas Gregor // If switch has default case, then ignore it. 855559fb554602bedb57dbbf3cc14ac8a38264b4547Ted Kremenek if (!CaseListIsErroneous && !HasConstantCond && ET) { 856ba915af51ced751c46e7c2b9c6f3b59d2e668825Douglas Gregor const EnumDecl *ED = ET->getDecl(); 8575f9e272e632e951b1efe824cd16acb4d96077930Chris Lattner typedef SmallVector<std::pair<llvm::APSInt, EnumConstantDecl*>, 64> 85858f14c012e5d739b09532bb12645dc161f88cfcfFrancois Pichet EnumValsTy; 859ba915af51ced751c46e7c2b9c6f3b59d2e668825Douglas Gregor EnumValsTy EnumVals; 860ba915af51ced751c46e7c2b9c6f3b59d2e668825Douglas Gregor 8610fb97083cc0f8a82e404e22991ae80d2216e71d5John McCall // Gather all enum values, set their type and sort them, 8620fb97083cc0f8a82e404e22991ae80d2216e71d5John McCall // allowing easier comparison with CaseVals. 8630fb97083cc0f8a82e404e22991ae80d2216e71d5John McCall for (EnumDecl::enumerator_iterator EDI = ED->enumerator_begin(); 86428164ab2ac1deea68cdb989f941728bf1860ce41Gabor Greif EDI != ED->enumerator_end(); ++EDI) { 86528164ab2ac1deea68cdb989f941728bf1860ce41Gabor Greif llvm::APSInt Val = EDI->getInitVal(); 86628164ab2ac1deea68cdb989f941728bf1860ce41Gabor Greif AdjustAPSInt(Val, CondWidth, CondIsSigned); 86728164ab2ac1deea68cdb989f941728bf1860ce41Gabor Greif EnumVals.push_back(std::make_pair(Val, *EDI)); 868ba915af51ced751c46e7c2b9c6f3b59d2e668825Douglas Gregor } 869ba915af51ced751c46e7c2b9c6f3b59d2e668825Douglas Gregor std::stable_sort(EnumVals.begin(), EnumVals.end(), CmpEnumVals); 8700fb97083cc0f8a82e404e22991ae80d2216e71d5John McCall EnumValsTy::iterator EIend = 8710fb97083cc0f8a82e404e22991ae80d2216e71d5John McCall std::unique(EnumVals.begin(), EnumVals.end(), EqEnumVals); 872559fb554602bedb57dbbf3cc14ac8a38264b4547Ted Kremenek 873559fb554602bedb57dbbf3cc14ac8a38264b4547Ted Kremenek // See which case values aren't in enum. 874559fb554602bedb57dbbf3cc14ac8a38264b4547Ted Kremenek // TODO: we might want to check whether case values are out of the 875559fb554602bedb57dbbf3cc14ac8a38264b4547Ted Kremenek // enum even if we don't want to check whether all cases are handled. 876559fb554602bedb57dbbf3cc14ac8a38264b4547Ted Kremenek if (!TheDefaultStmt) { 87747bb27f16882e4f5ababdd0cf6642bb904a9aaf8Ted Kremenek EnumValsTy::const_iterator EI = EnumVals.begin(); 87847bb27f16882e4f5ababdd0cf6642bb904a9aaf8Ted Kremenek for (CaseValsTy::const_iterator CI = CaseVals.begin(); 8790fb97083cc0f8a82e404e22991ae80d2216e71d5John McCall CI != CaseVals.end(); CI++) { 88047bb27f16882e4f5ababdd0cf6642bb904a9aaf8Ted Kremenek while (EI != EIend && EI->first < CI->first) 88147bb27f16882e4f5ababdd0cf6642bb904a9aaf8Ted Kremenek EI++; 88247bb27f16882e4f5ababdd0cf6642bb904a9aaf8Ted Kremenek if (EI == EIend || EI->first > CI->first) 8830fb97083cc0f8a82e404e22991ae80d2216e71d5John McCall Diag(CI->second->getLHS()->getExprLoc(), diag::warn_not_in_enum) 8840fb97083cc0f8a82e404e22991ae80d2216e71d5John McCall << ED->getDeclName(); 88547bb27f16882e4f5ababdd0cf6642bb904a9aaf8Ted Kremenek } 88647bb27f16882e4f5ababdd0cf6642bb904a9aaf8Ted Kremenek // See which of case ranges aren't in enum 88747bb27f16882e4f5ababdd0cf6642bb904a9aaf8Ted Kremenek EI = EnumVals.begin(); 88847bb27f16882e4f5ababdd0cf6642bb904a9aaf8Ted Kremenek for (CaseRangesTy::const_iterator RI = CaseRanges.begin(); 8890fb97083cc0f8a82e404e22991ae80d2216e71d5John McCall RI != CaseRanges.end() && EI != EIend; RI++) { 89047bb27f16882e4f5ababdd0cf6642bb904a9aaf8Ted Kremenek while (EI != EIend && EI->first < RI->first) 89147bb27f16882e4f5ababdd0cf6642bb904a9aaf8Ted Kremenek EI++; 892dfbb02a16ac8c764b5ba1742450513d6212d2f9fNAKAMURA Takumi 89347bb27f16882e4f5ababdd0cf6642bb904a9aaf8Ted Kremenek if (EI == EIend || EI->first != RI->first) { 89447bb27f16882e4f5ababdd0cf6642bb904a9aaf8Ted Kremenek Diag(RI->second->getLHS()->getExprLoc(), diag::warn_not_in_enum) 89547bb27f16882e4f5ababdd0cf6642bb904a9aaf8Ted Kremenek << ED->getDeclName(); 89647bb27f16882e4f5ababdd0cf6642bb904a9aaf8Ted Kremenek } 897e0ba9d1beeba01a96808c2fc61f9ca89acec313bTed Kremenek 89847bb27f16882e4f5ababdd0cf6642bb904a9aaf8Ted Kremenek llvm::APSInt Hi = RI->second->getRHS()->EvaluateAsInt(Context); 89928164ab2ac1deea68cdb989f941728bf1860ce41Gabor Greif AdjustAPSInt(Hi, CondWidth, CondIsSigned); 90047bb27f16882e4f5ababdd0cf6642bb904a9aaf8Ted Kremenek while (EI != EIend && EI->first < Hi) 90147bb27f16882e4f5ababdd0cf6642bb904a9aaf8Ted Kremenek EI++; 90247bb27f16882e4f5ababdd0cf6642bb904a9aaf8Ted Kremenek if (EI == EIend || EI->first != Hi) 90347bb27f16882e4f5ababdd0cf6642bb904a9aaf8Ted Kremenek Diag(RI->second->getRHS()->getExprLoc(), diag::warn_not_in_enum) 90447bb27f16882e4f5ababdd0cf6642bb904a9aaf8Ted Kremenek << ED->getDeclName(); 90547bb27f16882e4f5ababdd0cf6642bb904a9aaf8Ted Kremenek } 906ba915af51ced751c46e7c2b9c6f3b59d2e668825Douglas Gregor } 907dfbb02a16ac8c764b5ba1742450513d6212d2f9fNAKAMURA Takumi 908559fb554602bedb57dbbf3cc14ac8a38264b4547Ted Kremenek // Check which enum vals aren't in switch 909ba915af51ced751c46e7c2b9c6f3b59d2e668825Douglas Gregor CaseValsTy::const_iterator CI = CaseVals.begin(); 910ba915af51ced751c46e7c2b9c6f3b59d2e668825Douglas Gregor CaseRangesTy::const_iterator RI = CaseRanges.begin(); 911559fb554602bedb57dbbf3cc14ac8a38264b4547Ted Kremenek bool hasCasesNotInSwitch = false; 912559fb554602bedb57dbbf3cc14ac8a38264b4547Ted Kremenek 9135f9e272e632e951b1efe824cd16acb4d96077930Chris Lattner SmallVector<DeclarationName,8> UnhandledNames; 914dfbb02a16ac8c764b5ba1742450513d6212d2f9fNAKAMURA Takumi 915559fb554602bedb57dbbf3cc14ac8a38264b4547Ted Kremenek for (EnumValsTy::const_iterator EI = EnumVals.begin(); EI != EIend; EI++){ 916ce78461303f45fecb3460d1c49c9b71f27ad19c3Chris Lattner // Drop unneeded case values 917ba915af51ced751c46e7c2b9c6f3b59d2e668825Douglas Gregor llvm::APSInt CIVal; 918ba915af51ced751c46e7c2b9c6f3b59d2e668825Douglas Gregor while (CI != CaseVals.end() && CI->first < EI->first) 919ba915af51ced751c46e7c2b9c6f3b59d2e668825Douglas Gregor CI++; 920dfbb02a16ac8c764b5ba1742450513d6212d2f9fNAKAMURA Takumi 921ba915af51ced751c46e7c2b9c6f3b59d2e668825Douglas Gregor if (CI != CaseVals.end() && CI->first == EI->first) 922ba915af51ced751c46e7c2b9c6f3b59d2e668825Douglas Gregor continue; 923ba915af51ced751c46e7c2b9c6f3b59d2e668825Douglas Gregor 924559fb554602bedb57dbbf3cc14ac8a38264b4547Ted Kremenek // Drop unneeded case ranges 925ba915af51ced751c46e7c2b9c6f3b59d2e668825Douglas Gregor for (; RI != CaseRanges.end(); RI++) { 926ba915af51ced751c46e7c2b9c6f3b59d2e668825Douglas Gregor llvm::APSInt Hi = RI->second->getRHS()->EvaluateAsInt(Context); 92728164ab2ac1deea68cdb989f941728bf1860ce41Gabor Greif AdjustAPSInt(Hi, CondWidth, CondIsSigned); 928ba915af51ced751c46e7c2b9c6f3b59d2e668825Douglas Gregor if (EI->first <= Hi) 929ba915af51ced751c46e7c2b9c6f3b59d2e668825Douglas Gregor break; 930ba915af51ced751c46e7c2b9c6f3b59d2e668825Douglas Gregor } 931ba915af51ced751c46e7c2b9c6f3b59d2e668825Douglas Gregor 932559fb554602bedb57dbbf3cc14ac8a38264b4547Ted Kremenek if (RI == CaseRanges.end() || EI->first < RI->first) { 93347bb27f16882e4f5ababdd0cf6642bb904a9aaf8Ted Kremenek hasCasesNotInSwitch = true; 93447bb27f16882e4f5ababdd0cf6642bb904a9aaf8Ted Kremenek if (!TheDefaultStmt) 935ce78461303f45fecb3460d1c49c9b71f27ad19c3Chris Lattner UnhandledNames.push_back(EI->second->getDeclName()); 93647bb27f16882e4f5ababdd0cf6642bb904a9aaf8Ted Kremenek } 937ba915af51ced751c46e7c2b9c6f3b59d2e668825Douglas Gregor } 938dfbb02a16ac8c764b5ba1742450513d6212d2f9fNAKAMURA Takumi 939ce78461303f45fecb3460d1c49c9b71f27ad19c3Chris Lattner // Produce a nice diagnostic if multiple values aren't handled. 940ce78461303f45fecb3460d1c49c9b71f27ad19c3Chris Lattner switch (UnhandledNames.size()) { 941ce78461303f45fecb3460d1c49c9b71f27ad19c3Chris Lattner case 0: break; 942ce78461303f45fecb3460d1c49c9b71f27ad19c3Chris Lattner case 1: 943ce78461303f45fecb3460d1c49c9b71f27ad19c3Chris Lattner Diag(CondExpr->getExprLoc(), diag::warn_missing_case1) 944ce78461303f45fecb3460d1c49c9b71f27ad19c3Chris Lattner << UnhandledNames[0]; 945ce78461303f45fecb3460d1c49c9b71f27ad19c3Chris Lattner break; 946ce78461303f45fecb3460d1c49c9b71f27ad19c3Chris Lattner case 2: 947ce78461303f45fecb3460d1c49c9b71f27ad19c3Chris Lattner Diag(CondExpr->getExprLoc(), diag::warn_missing_case2) 948ce78461303f45fecb3460d1c49c9b71f27ad19c3Chris Lattner << UnhandledNames[0] << UnhandledNames[1]; 949ce78461303f45fecb3460d1c49c9b71f27ad19c3Chris Lattner break; 950ce78461303f45fecb3460d1c49c9b71f27ad19c3Chris Lattner case 3: 951ce78461303f45fecb3460d1c49c9b71f27ad19c3Chris Lattner Diag(CondExpr->getExprLoc(), diag::warn_missing_case3) 952ce78461303f45fecb3460d1c49c9b71f27ad19c3Chris Lattner << UnhandledNames[0] << UnhandledNames[1] << UnhandledNames[2]; 953ce78461303f45fecb3460d1c49c9b71f27ad19c3Chris Lattner break; 954ce78461303f45fecb3460d1c49c9b71f27ad19c3Chris Lattner default: 955ce78461303f45fecb3460d1c49c9b71f27ad19c3Chris Lattner Diag(CondExpr->getExprLoc(), diag::warn_missing_cases) 956ce78461303f45fecb3460d1c49c9b71f27ad19c3Chris Lattner << (unsigned)UnhandledNames.size() 957ce78461303f45fecb3460d1c49c9b71f27ad19c3Chris Lattner << UnhandledNames[0] << UnhandledNames[1] << UnhandledNames[2]; 958ce78461303f45fecb3460d1c49c9b71f27ad19c3Chris Lattner break; 959ce78461303f45fecb3460d1c49c9b71f27ad19c3Chris Lattner } 960559fb554602bedb57dbbf3cc14ac8a38264b4547Ted Kremenek 961559fb554602bedb57dbbf3cc14ac8a38264b4547Ted Kremenek if (!hasCasesNotInSwitch) 96247bb27f16882e4f5ababdd0cf6642bb904a9aaf8Ted Kremenek SS->setAllEnumCasesCovered(); 963ba915af51ced751c46e7c2b9c6f3b59d2e668825Douglas Gregor } 964b2ec9d6fede9cccc170a202de7bf7f523dea8be4Chris Lattner } 965dbb26db1d426fb6caaaf1b4fa47b46d1947c12c9Douglas Gregor 966390b4cc8b45a05612349269ef08faab3e4688f06Mike Stump // FIXME: If the case list was broken is some way, we don't have a good system 967390b4cc8b45a05612349269ef08faab3e4688f06Mike Stump // to patch it up. Instead, just return the whole substmt as broken. 968b2ec9d6fede9cccc170a202de7bf7f523dea8be4Chris Lattner if (CaseListIsErroneous) 969de307473448fb3cebcb4c10090728300b53bca03Sebastian Redl return StmtError(); 970de307473448fb3cebcb4c10090728300b53bca03Sebastian Redl 971de307473448fb3cebcb4c10090728300b53bca03Sebastian Redl return Owned(SS); 9725f016e2cb5d11daeb237544de1c5d59f20fe1a6eReid Spencer} 9735f016e2cb5d11daeb237544de1c5d59f20fe1a6eReid Spencer 97460d7b3a319d84d688752be3870615ac0f111fb16John McCallStmtResult 975dfbb02a16ac8c764b5ba1742450513d6212d2f9fNAKAMURA TakumiSema::ActOnWhileStmt(SourceLocation WhileLoc, FullExprArg Cond, 9769ae2f076ca5ab1feb3ba95629099ec2319833701John McCall Decl *CondVar, Stmt *Body) { 97760d7b3a319d84d688752be3870615ac0f111fb16John McCall ExprResult CondResult(Cond.release()); 978dfbb02a16ac8c764b5ba1742450513d6212d2f9fNAKAMURA Takumi 9795656e14d91405417182171a705ed3e3d2d6d7aa3Douglas Gregor VarDecl *ConditionVar = 0; 980d226f65006733ed7f709c3174f22ce33391cb58fJohn McCall if (CondVar) { 981d226f65006733ed7f709c3174f22ce33391cb58fJohn McCall ConditionVar = cast<VarDecl>(CondVar); 982586596fd7f7a336a2847b300c80614dcf39ab6d5Douglas Gregor CondResult = CheckConditionVariable(ConditionVar, WhileLoc, true); 98399e9b4d172f6877e6ba5ebe75bb8238721f5e01cDouglas Gregor if (CondResult.isInvalid()) 98499e9b4d172f6877e6ba5ebe75bb8238721f5e01cDouglas Gregor return StmtError(); 9855656e14d91405417182171a705ed3e3d2d6d7aa3Douglas Gregor } 9869ae2f076ca5ab1feb3ba95629099ec2319833701John McCall Expr *ConditionExpr = CondResult.take(); 98799e9b4d172f6877e6ba5ebe75bb8238721f5e01cDouglas Gregor if (!ConditionExpr) 98899e9b4d172f6877e6ba5ebe75bb8238721f5e01cDouglas Gregor return StmtError(); 989dfbb02a16ac8c764b5ba1742450513d6212d2f9fNAKAMURA Takumi 9909ae2f076ca5ab1feb3ba95629099ec2319833701John McCall DiagnoseUnusedExprResult(Body); 9911eb4433ac451dc16f4133a88af2d002ac26c58efMike Stump 99243dec6bbde2d0a16c35978983761c8b7030c8e18Douglas Gregor return Owned(new (Context) WhileStmt(Context, ConditionVar, ConditionExpr, 9939ae2f076ca5ab1feb3ba95629099ec2319833701John McCall Body, WhileLoc)); 9945f016e2cb5d11daeb237544de1c5d59f20fe1a6eReid Spencer} 9955f016e2cb5d11daeb237544de1c5d59f20fe1a6eReid Spencer 99660d7b3a319d84d688752be3870615ac0f111fb16John McCallStmtResult 9979ae2f076ca5ab1feb3ba95629099ec2319833701John McCallSema::ActOnDoStmt(SourceLocation DoLoc, Stmt *Body, 998989135901c750af61ef012b6b0a0368be415bc46Chris Lattner SourceLocation WhileLoc, SourceLocation CondLParen, 9999ae2f076ca5ab1feb3ba95629099ec2319833701John McCall Expr *Cond, SourceLocation CondRParen) { 10009ae2f076ca5ab1feb3ba95629099ec2319833701John McCall assert(Cond && "ActOnDoStmt(): missing expression"); 1001f05b1520d6f175acbfc3913489f4dfa842875ec4Sebastian Redl 1002429bb276991ff2dbc7c5b438828b9b7737cb15ebJohn Wiegley ExprResult CondResult = CheckBooleanCondition(Cond, DoLoc); 1003429bb276991ff2dbc7c5b438828b9b7737cb15ebJohn Wiegley if (CondResult.isInvalid() || CondResult.isInvalid()) 10045a881bb09928b7ade891efc680088aaad276f8d6John McCall return StmtError(); 1005429bb276991ff2dbc7c5b438828b9b7737cb15ebJohn Wiegley Cond = CondResult.take(); 10065f016e2cb5d11daeb237544de1c5d59f20fe1a6eReid Spencer 1007b4eb64d8426c0eaa58d398961e0e74ff85063d7cJohn McCall CheckImplicitConversions(Cond, DoLoc); 1008429bb276991ff2dbc7c5b438828b9b7737cb15ebJohn Wiegley CondResult = MaybeCreateExprWithCleanups(Cond); 10099ae2f076ca5ab1feb3ba95629099ec2319833701John McCall if (CondResult.isInvalid()) 1010586596fd7f7a336a2847b300c80614dcf39ab6d5Douglas Gregor return StmtError(); 10119ae2f076ca5ab1feb3ba95629099ec2319833701John McCall Cond = CondResult.take(); 1012dfbb02a16ac8c764b5ba1742450513d6212d2f9fNAKAMURA Takumi 10139ae2f076ca5ab1feb3ba95629099ec2319833701John McCall DiagnoseUnusedExprResult(Body); 1014754431107b61a0523df5271c2876a73dd5a051e9Anders Carlsson 10159ae2f076ca5ab1feb3ba95629099ec2319833701John McCall return Owned(new (Context) DoStmt(Body, Cond, DoLoc, WhileLoc, CondRParen)); 10165f016e2cb5d11daeb237544de1c5d59f20fe1a6eReid Spencer} 10175f016e2cb5d11daeb237544de1c5d59f20fe1a6eReid Spencer 101860d7b3a319d84d688752be3870615ac0f111fb16John McCallStmtResult 1019f05b1520d6f175acbfc3913489f4dfa842875ec4Sebastian RedlSema::ActOnForStmt(SourceLocation ForLoc, SourceLocation LParenLoc, 10209ae2f076ca5ab1feb3ba95629099ec2319833701John McCall Stmt *First, FullExprArg second, Decl *secondVar, 102199e9b4d172f6877e6ba5ebe75bb8238721f5e01cDouglas Gregor FullExprArg third, 10229ae2f076ca5ab1feb3ba95629099ec2319833701John McCall SourceLocation RParenLoc, Stmt *Body) { 10235921093cf1c2e9a8bd1a22b6f612e551bae7476bArgyrios Kyrtzidis if (!getLangOptions().CPlusPlus) { 10245921093cf1c2e9a8bd1a22b6f612e551bae7476bArgyrios Kyrtzidis if (DeclStmt *DS = dyn_cast_or_null<DeclStmt>(First)) { 1025f3a41af4d5c98a72a1d6720bbbfd658e57ef2541Chris Lattner // C99 6.8.5p3: The declaration part of a 'for' statement shall only 1026f3a41af4d5c98a72a1d6720bbbfd658e57ef2541Chris Lattner // declare identifiers for objects having storage class 'auto' or 1027f3a41af4d5c98a72a1d6720bbbfd658e57ef2541Chris Lattner // 'register'. 10285921093cf1c2e9a8bd1a22b6f612e551bae7476bArgyrios Kyrtzidis for (DeclStmt::decl_iterator DI=DS->decl_begin(), DE=DS->decl_end(); 10295921093cf1c2e9a8bd1a22b6f612e551bae7476bArgyrios Kyrtzidis DI!=DE; ++DI) { 10305921093cf1c2e9a8bd1a22b6f612e551bae7476bArgyrios Kyrtzidis VarDecl *VD = dyn_cast<VarDecl>(*DI); 1031b6bbcc9995186799a60ce17d0c1acff31601653aJohn McCall if (VD && VD->isLocalVarDecl() && !VD->hasLocalStorage()) 10325921093cf1c2e9a8bd1a22b6f612e551bae7476bArgyrios Kyrtzidis VD = 0; 10335921093cf1c2e9a8bd1a22b6f612e551bae7476bArgyrios Kyrtzidis if (VD == 0) 10345921093cf1c2e9a8bd1a22b6f612e551bae7476bArgyrios Kyrtzidis Diag((*DI)->getLocation(), diag::err_non_variable_decl_in_for); 10355921093cf1c2e9a8bd1a22b6f612e551bae7476bArgyrios Kyrtzidis // FIXME: mark decl erroneous! 10365921093cf1c2e9a8bd1a22b6f612e551bae7476bArgyrios Kyrtzidis } 1037ae3b701f59e78e058b83344be17206af3bf5d277Chris Lattner } 10385f016e2cb5d11daeb237544de1c5d59f20fe1a6eReid Spencer } 103999e9b4d172f6877e6ba5ebe75bb8238721f5e01cDouglas Gregor 104060d7b3a319d84d688752be3870615ac0f111fb16John McCall ExprResult SecondResult(second.release()); 104199e9b4d172f6877e6ba5ebe75bb8238721f5e01cDouglas Gregor VarDecl *ConditionVar = 0; 1042d226f65006733ed7f709c3174f22ce33391cb58fJohn McCall if (secondVar) { 1043d226f65006733ed7f709c3174f22ce33391cb58fJohn McCall ConditionVar = cast<VarDecl>(secondVar); 1044586596fd7f7a336a2847b300c80614dcf39ab6d5Douglas Gregor SecondResult = CheckConditionVariable(ConditionVar, ForLoc, true); 104599e9b4d172f6877e6ba5ebe75bb8238721f5e01cDouglas Gregor if (SecondResult.isInvalid()) 104699e9b4d172f6877e6ba5ebe75bb8238721f5e01cDouglas Gregor return StmtError(); 104799e9b4d172f6877e6ba5ebe75bb8238721f5e01cDouglas Gregor } 1048dfbb02a16ac8c764b5ba1742450513d6212d2f9fNAKAMURA Takumi 104999e9b4d172f6877e6ba5ebe75bb8238721f5e01cDouglas Gregor Expr *Third = third.release().takeAs<Expr>(); 1050dfbb02a16ac8c764b5ba1742450513d6212d2f9fNAKAMURA Takumi 10513af708ff19e4ae2bf9e40550548361b00e5916bfAnders Carlsson DiagnoseUnusedExprResult(First); 10523af708ff19e4ae2bf9e40550548361b00e5916bfAnders Carlsson DiagnoseUnusedExprResult(Third); 1053754431107b61a0523df5271c2876a73dd5a051e9Anders Carlsson DiagnoseUnusedExprResult(Body); 1054754431107b61a0523df5271c2876a73dd5a051e9Anders Carlsson 1055dfbb02a16ac8c764b5ba1742450513d6212d2f9fNAKAMURA Takumi return Owned(new (Context) ForStmt(Context, First, 1056dfbb02a16ac8c764b5ba1742450513d6212d2f9fNAKAMURA Takumi SecondResult.take(), ConditionVar, 1057dfbb02a16ac8c764b5ba1742450513d6212d2f9fNAKAMURA Takumi Third, Body, ForLoc, LParenLoc, 105843dec6bbde2d0a16c35978983761c8b7030c8e18Douglas Gregor RParenLoc)); 10595f016e2cb5d11daeb237544de1c5d59f20fe1a6eReid Spencer} 10605f016e2cb5d11daeb237544de1c5d59f20fe1a6eReid Spencer 1061f6a1648197562e0b133440d612d9af297d0a86ccJohn McCall/// In an Objective C collection iteration statement: 1062f6a1648197562e0b133440d612d9af297d0a86ccJohn McCall/// for (x in y) 1063f6a1648197562e0b133440d612d9af297d0a86ccJohn McCall/// x can be an arbitrary l-value expression. Bind it up as a 1064f6a1648197562e0b133440d612d9af297d0a86ccJohn McCall/// full-expression. 1065f6a1648197562e0b133440d612d9af297d0a86ccJohn McCallStmtResult Sema::ActOnForEachLValueExpr(Expr *E) { 1066f6a1648197562e0b133440d612d9af297d0a86ccJohn McCall CheckImplicitConversions(E); 10674765fa05b5652fcc4356371c2f481d0ea9a1b007John McCall ExprResult Result = MaybeCreateExprWithCleanups(E); 1068f6a1648197562e0b133440d612d9af297d0a86ccJohn McCall if (Result.isInvalid()) return StmtError(); 1069f6a1648197562e0b133440d612d9af297d0a86ccJohn McCall return Owned(static_cast<Stmt*>(Result.get())); 1070f6a1648197562e0b133440d612d9af297d0a86ccJohn McCall} 1071f6a1648197562e0b133440d612d9af297d0a86ccJohn McCall 1072990567cb60e8530ba01b41d4e056e32b44b95ec0John McCallExprResult 1073990567cb60e8530ba01b41d4e056e32b44b95ec0John McCallSema::ActOnObjCForCollectionOperand(SourceLocation forLoc, Expr *collection) { 1074990567cb60e8530ba01b41d4e056e32b44b95ec0John McCall assert(collection); 1075990567cb60e8530ba01b41d4e056e32b44b95ec0John McCall 1076990567cb60e8530ba01b41d4e056e32b44b95ec0John McCall // Bail out early if we've got a type-dependent expression. 1077990567cb60e8530ba01b41d4e056e32b44b95ec0John McCall if (collection->isTypeDependent()) return Owned(collection); 1078990567cb60e8530ba01b41d4e056e32b44b95ec0John McCall 1079990567cb60e8530ba01b41d4e056e32b44b95ec0John McCall // Perform normal l-value conversion. 1080990567cb60e8530ba01b41d4e056e32b44b95ec0John McCall ExprResult result = DefaultFunctionArrayLvalueConversion(collection); 1081990567cb60e8530ba01b41d4e056e32b44b95ec0John McCall if (result.isInvalid()) 1082990567cb60e8530ba01b41d4e056e32b44b95ec0John McCall return ExprError(); 1083990567cb60e8530ba01b41d4e056e32b44b95ec0John McCall collection = result.take(); 1084990567cb60e8530ba01b41d4e056e32b44b95ec0John McCall 1085990567cb60e8530ba01b41d4e056e32b44b95ec0John McCall // The operand needs to have object-pointer type. 1086990567cb60e8530ba01b41d4e056e32b44b95ec0John McCall // TODO: should we do a contextual conversion? 1087990567cb60e8530ba01b41d4e056e32b44b95ec0John McCall const ObjCObjectPointerType *pointerType = 1088990567cb60e8530ba01b41d4e056e32b44b95ec0John McCall collection->getType()->getAs<ObjCObjectPointerType>(); 1089990567cb60e8530ba01b41d4e056e32b44b95ec0John McCall if (!pointerType) 1090990567cb60e8530ba01b41d4e056e32b44b95ec0John McCall return Diag(forLoc, diag::err_collection_expr_type) 1091990567cb60e8530ba01b41d4e056e32b44b95ec0John McCall << collection->getType() << collection->getSourceRange(); 1092990567cb60e8530ba01b41d4e056e32b44b95ec0John McCall 1093990567cb60e8530ba01b41d4e056e32b44b95ec0John McCall // Check that the operand provides 1094990567cb60e8530ba01b41d4e056e32b44b95ec0John McCall // - countByEnumeratingWithState:objects:count: 1095990567cb60e8530ba01b41d4e056e32b44b95ec0John McCall const ObjCObjectType *objectType = pointerType->getObjectType(); 1096990567cb60e8530ba01b41d4e056e32b44b95ec0John McCall ObjCInterfaceDecl *iface = objectType->getInterface(); 1097990567cb60e8530ba01b41d4e056e32b44b95ec0John McCall 1098990567cb60e8530ba01b41d4e056e32b44b95ec0John McCall // If we have a forward-declared type, we can't do this check. 1099990567cb60e8530ba01b41d4e056e32b44b95ec0John McCall if (iface && iface->isForwardDecl()) { 1100990567cb60e8530ba01b41d4e056e32b44b95ec0John McCall // This is ill-formed under ARC. 1101990567cb60e8530ba01b41d4e056e32b44b95ec0John McCall if (getLangOptions().ObjCAutoRefCount) { 1102990567cb60e8530ba01b41d4e056e32b44b95ec0John McCall Diag(forLoc, diag::err_arc_collection_forward) 1103990567cb60e8530ba01b41d4e056e32b44b95ec0John McCall << pointerType->getPointeeType() << collection->getSourceRange(); 1104990567cb60e8530ba01b41d4e056e32b44b95ec0John McCall } 1105990567cb60e8530ba01b41d4e056e32b44b95ec0John McCall 1106990567cb60e8530ba01b41d4e056e32b44b95ec0John McCall // Otherwise, if we have any useful type information, check that 1107990567cb60e8530ba01b41d4e056e32b44b95ec0John McCall // the type declares the appropriate method. 1108990567cb60e8530ba01b41d4e056e32b44b95ec0John McCall } else if (iface || !objectType->qual_empty()) { 1109990567cb60e8530ba01b41d4e056e32b44b95ec0John McCall IdentifierInfo *selectorIdents[] = { 1110990567cb60e8530ba01b41d4e056e32b44b95ec0John McCall &Context.Idents.get("countByEnumeratingWithState"), 1111990567cb60e8530ba01b41d4e056e32b44b95ec0John McCall &Context.Idents.get("objects"), 1112990567cb60e8530ba01b41d4e056e32b44b95ec0John McCall &Context.Idents.get("count") 1113990567cb60e8530ba01b41d4e056e32b44b95ec0John McCall }; 1114990567cb60e8530ba01b41d4e056e32b44b95ec0John McCall Selector selector = Context.Selectors.getSelector(3, &selectorIdents[0]); 1115990567cb60e8530ba01b41d4e056e32b44b95ec0John McCall 1116990567cb60e8530ba01b41d4e056e32b44b95ec0John McCall ObjCMethodDecl *method = 0; 1117990567cb60e8530ba01b41d4e056e32b44b95ec0John McCall 1118990567cb60e8530ba01b41d4e056e32b44b95ec0John McCall // If there's an interface, look in both the public and private APIs. 1119990567cb60e8530ba01b41d4e056e32b44b95ec0John McCall if (iface) { 1120990567cb60e8530ba01b41d4e056e32b44b95ec0John McCall method = iface->lookupInstanceMethod(selector); 1121990567cb60e8530ba01b41d4e056e32b44b95ec0John McCall if (!method) method = LookupPrivateInstanceMethod(selector, iface); 1122990567cb60e8530ba01b41d4e056e32b44b95ec0John McCall } 1123990567cb60e8530ba01b41d4e056e32b44b95ec0John McCall 1124990567cb60e8530ba01b41d4e056e32b44b95ec0John McCall // Also check protocol qualifiers. 1125990567cb60e8530ba01b41d4e056e32b44b95ec0John McCall if (!method) 1126990567cb60e8530ba01b41d4e056e32b44b95ec0John McCall method = LookupMethodInQualifiedType(selector, pointerType, 1127990567cb60e8530ba01b41d4e056e32b44b95ec0John McCall /*instance*/ true); 1128990567cb60e8530ba01b41d4e056e32b44b95ec0John McCall 1129990567cb60e8530ba01b41d4e056e32b44b95ec0John McCall // If we didn't find it anywhere, give up. 1130990567cb60e8530ba01b41d4e056e32b44b95ec0John McCall if (!method) { 1131990567cb60e8530ba01b41d4e056e32b44b95ec0John McCall Diag(forLoc, diag::warn_collection_expr_type) 1132990567cb60e8530ba01b41d4e056e32b44b95ec0John McCall << collection->getType() << selector << collection->getSourceRange(); 1133990567cb60e8530ba01b41d4e056e32b44b95ec0John McCall } 1134990567cb60e8530ba01b41d4e056e32b44b95ec0John McCall 1135990567cb60e8530ba01b41d4e056e32b44b95ec0John McCall // TODO: check for an incompatible signature? 1136990567cb60e8530ba01b41d4e056e32b44b95ec0John McCall } 1137990567cb60e8530ba01b41d4e056e32b44b95ec0John McCall 1138990567cb60e8530ba01b41d4e056e32b44b95ec0John McCall // Wrap up any cleanups in the expression. 1139990567cb60e8530ba01b41d4e056e32b44b95ec0John McCall return Owned(MaybeCreateExprWithCleanups(collection)); 1140990567cb60e8530ba01b41d4e056e32b44b95ec0John McCall} 1141990567cb60e8530ba01b41d4e056e32b44b95ec0John McCall 114260d7b3a319d84d688752be3870615ac0f111fb16John McCallStmtResult 1143f05b1520d6f175acbfc3913489f4dfa842875ec4Sebastian RedlSema::ActOnObjCForCollectionStmt(SourceLocation ForLoc, 1144f05b1520d6f175acbfc3913489f4dfa842875ec4Sebastian Redl SourceLocation LParenLoc, 11459ae2f076ca5ab1feb3ba95629099ec2319833701John McCall Stmt *First, Expr *Second, 11469ae2f076ca5ab1feb3ba95629099ec2319833701John McCall SourceLocation RParenLoc, Stmt *Body) { 114720552d2842245692b649e0d25380670922f954a2Fariborz Jahanian if (First) { 114820552d2842245692b649e0d25380670922f954a2Fariborz Jahanian QualType FirstType; 114920552d2842245692b649e0d25380670922f954a2Fariborz Jahanian if (DeclStmt *DS = dyn_cast<DeclStmt>(First)) { 11507e24e82a70a2c681f4291a3397bcd1e1005f251aChris Lattner if (!DS->isSingleDecl()) 1151f05b1520d6f175acbfc3913489f4dfa842875ec4Sebastian Redl return StmtError(Diag((*DS->decl_begin())->getLocation(), 1152f05b1520d6f175acbfc3913489f4dfa842875ec4Sebastian Redl diag::err_toomany_element_decls)); 1153f05b1520d6f175acbfc3913489f4dfa842875ec4Sebastian Redl 1154f85e193739c953358c865005855253af4f68a497John McCall VarDecl *D = cast<VarDecl>(DS->getSingleDecl()); 1155f85e193739c953358c865005855253af4f68a497John McCall FirstType = D->getType(); 1156f3a41af4d5c98a72a1d6720bbbfd658e57ef2541Chris Lattner // C99 6.8.5p3: The declaration part of a 'for' statement shall only 1157f3a41af4d5c98a72a1d6720bbbfd658e57ef2541Chris Lattner // declare identifiers for objects having storage class 'auto' or 1158f3a41af4d5c98a72a1d6720bbbfd658e57ef2541Chris Lattner // 'register'. 1159f85e193739c953358c865005855253af4f68a497John McCall if (!D->hasLocalStorage()) 1160f85e193739c953358c865005855253af4f68a497John McCall return StmtError(Diag(D->getLocation(), 1161f05b1520d6f175acbfc3913489f4dfa842875ec4Sebastian Redl diag::err_non_variable_decl_in_for)); 11621fe379f0fa6fbc0a6057e8966253aea2957ca953Anders Carlsson } else { 1163c3203e7ee1464a096f341c2e2a83a10be2da000aDouglas Gregor Expr *FirstE = cast<Expr>(First); 11647eb0a9eb0cde8444b97f9c5b713d9be7a6f1e607John McCall if (!FirstE->isTypeDependent() && !FirstE->isLValue()) 1165f05b1520d6f175acbfc3913489f4dfa842875ec4Sebastian Redl return StmtError(Diag(First->getLocStart(), 1166f05b1520d6f175acbfc3913489f4dfa842875ec4Sebastian Redl diag::err_selector_element_not_lvalue) 1167f05b1520d6f175acbfc3913489f4dfa842875ec4Sebastian Redl << First->getSourceRange()); 11681fe379f0fa6fbc0a6057e8966253aea2957ca953Anders Carlsson 11691eb4433ac451dc16f4133a88af2d002ac26c58efMike Stump FirstType = static_cast<Expr*>(First)->getType(); 11701fe379f0fa6fbc0a6057e8966253aea2957ca953Anders Carlsson } 1171c3203e7ee1464a096f341c2e2a83a10be2da000aDouglas Gregor if (!FirstType->isDependentType() && 1172c3203e7ee1464a096f341c2e2a83a10be2da000aDouglas Gregor !FirstType->isObjCObjectPointerType() && 1173a5e42a82ce055f29f3733f3a1f10da6cb9877deeFariborz Jahanian !FirstType->isBlockPointerType()) 1174dcd5ef12488e4c7ea844327835896ca86b609a97Chris Lattner Diag(ForLoc, diag::err_selector_element_type) 1175d162584991885ab004a02573a73ce06422b921fcChris Lattner << FirstType << First->getSourceRange(); 11763ba5a0f90a03d5e13d02cbee9abd2a1ba01b18bcFariborz Jahanian } 1177990567cb60e8530ba01b41d4e056e32b44b95ec0John McCall 11788189cde56b4f6f938cd65f53c932fe1860d0204cTed Kremenek return Owned(new (Context) ObjCForCollectionStmt(First, Second, Body, 11798189cde56b4f6f938cd65f53c932fe1860d0204cTed Kremenek ForLoc, RParenLoc)); 11803ba5a0f90a03d5e13d02cbee9abd2a1ba01b18bcFariborz Jahanian} 11815f016e2cb5d11daeb237544de1c5d59f20fe1a6eReid Spencer 1182ad762fcdc16b9e4705b12b09d92b8c026212b906Richard Smithnamespace { 1183ad762fcdc16b9e4705b12b09d92b8c026212b906Richard Smith 1184ad762fcdc16b9e4705b12b09d92b8c026212b906Richard Smithenum BeginEndFunction { 1185ad762fcdc16b9e4705b12b09d92b8c026212b906Richard Smith BEF_begin, 1186ad762fcdc16b9e4705b12b09d92b8c026212b906Richard Smith BEF_end 1187ad762fcdc16b9e4705b12b09d92b8c026212b906Richard Smith}; 1188ad762fcdc16b9e4705b12b09d92b8c026212b906Richard Smith 1189ad762fcdc16b9e4705b12b09d92b8c026212b906Richard Smith/// Build a variable declaration for a for-range statement. 1190ad762fcdc16b9e4705b12b09d92b8c026212b906Richard Smithstatic VarDecl *BuildForRangeVarDecl(Sema &SemaRef, SourceLocation Loc, 1191ad762fcdc16b9e4705b12b09d92b8c026212b906Richard Smith QualType Type, const char *Name) { 1192ad762fcdc16b9e4705b12b09d92b8c026212b906Richard Smith DeclContext *DC = SemaRef.CurContext; 1193ad762fcdc16b9e4705b12b09d92b8c026212b906Richard Smith IdentifierInfo *II = &SemaRef.PP.getIdentifierTable().get(Name); 1194ad762fcdc16b9e4705b12b09d92b8c026212b906Richard Smith TypeSourceInfo *TInfo = SemaRef.Context.getTrivialTypeSourceInfo(Type, Loc); 1195ad762fcdc16b9e4705b12b09d92b8c026212b906Richard Smith VarDecl *Decl = VarDecl::Create(SemaRef.Context, DC, Loc, Loc, II, Type, 1196ad762fcdc16b9e4705b12b09d92b8c026212b906Richard Smith TInfo, SC_Auto, SC_None); 1197b403d6d746239095a2c7bac958c924d92434e2b4Richard Smith Decl->setImplicit(); 1198ad762fcdc16b9e4705b12b09d92b8c026212b906Richard Smith return Decl; 1199ad762fcdc16b9e4705b12b09d92b8c026212b906Richard Smith} 1200ad762fcdc16b9e4705b12b09d92b8c026212b906Richard Smith 1201ad762fcdc16b9e4705b12b09d92b8c026212b906Richard Smith/// Finish building a variable declaration for a for-range statement. 1202ad762fcdc16b9e4705b12b09d92b8c026212b906Richard Smith/// \return true if an error occurs. 1203ad762fcdc16b9e4705b12b09d92b8c026212b906Richard Smithstatic bool FinishForRangeVarDecl(Sema &SemaRef, VarDecl *Decl, Expr *Init, 1204ad762fcdc16b9e4705b12b09d92b8c026212b906Richard Smith SourceLocation Loc, int diag) { 1205ad762fcdc16b9e4705b12b09d92b8c026212b906Richard Smith // Deduce the type for the iterator variable now rather than leaving it to 1206ad762fcdc16b9e4705b12b09d92b8c026212b906Richard Smith // AddInitializerToDecl, so we can produce a more suitable diagnostic. 1207ad762fcdc16b9e4705b12b09d92b8c026212b906Richard Smith TypeSourceInfo *InitTSI = 0; 1208ad762fcdc16b9e4705b12b09d92b8c026212b906Richard Smith if (Init->getType()->isVoidType() || 1209ad762fcdc16b9e4705b12b09d92b8c026212b906Richard Smith !SemaRef.DeduceAutoType(Decl->getTypeSourceInfo(), Init, InitTSI)) 1210ad762fcdc16b9e4705b12b09d92b8c026212b906Richard Smith SemaRef.Diag(Loc, diag) << Init->getType(); 1211ad762fcdc16b9e4705b12b09d92b8c026212b906Richard Smith if (!InitTSI) { 1212ad762fcdc16b9e4705b12b09d92b8c026212b906Richard Smith Decl->setInvalidDecl(); 1213ad762fcdc16b9e4705b12b09d92b8c026212b906Richard Smith return true; 1214ad762fcdc16b9e4705b12b09d92b8c026212b906Richard Smith } 1215ad762fcdc16b9e4705b12b09d92b8c026212b906Richard Smith Decl->setTypeSourceInfo(InitTSI); 1216ad762fcdc16b9e4705b12b09d92b8c026212b906Richard Smith Decl->setType(InitTSI->getType()); 1217ad762fcdc16b9e4705b12b09d92b8c026212b906Richard Smith 1218f85e193739c953358c865005855253af4f68a497John McCall // In ARC, infer lifetime. 1219f85e193739c953358c865005855253af4f68a497John McCall // FIXME: ARC may want to turn this into 'const __unsafe_unretained' if 1220f85e193739c953358c865005855253af4f68a497John McCall // we're doing the equivalent of fast iteration. 1221f85e193739c953358c865005855253af4f68a497John McCall if (SemaRef.getLangOptions().ObjCAutoRefCount && 1222f85e193739c953358c865005855253af4f68a497John McCall SemaRef.inferObjCARCLifetime(Decl)) 1223f85e193739c953358c865005855253af4f68a497John McCall Decl->setInvalidDecl(); 1224f85e193739c953358c865005855253af4f68a497John McCall 1225ad762fcdc16b9e4705b12b09d92b8c026212b906Richard Smith SemaRef.AddInitializerToDecl(Decl, Init, /*DirectInit=*/false, 1226ad762fcdc16b9e4705b12b09d92b8c026212b906Richard Smith /*TypeMayContainAuto=*/false); 1227ad762fcdc16b9e4705b12b09d92b8c026212b906Richard Smith SemaRef.FinalizeDeclaration(Decl); 1228b403d6d746239095a2c7bac958c924d92434e2b4Richard Smith SemaRef.CurContext->addHiddenDecl(Decl); 1229ad762fcdc16b9e4705b12b09d92b8c026212b906Richard Smith return false; 1230ad762fcdc16b9e4705b12b09d92b8c026212b906Richard Smith} 1231ad762fcdc16b9e4705b12b09d92b8c026212b906Richard Smith 1232ad762fcdc16b9e4705b12b09d92b8c026212b906Richard Smith/// Produce a note indicating which begin/end function was implicitly called 1233ad762fcdc16b9e4705b12b09d92b8c026212b906Richard Smith/// by a C++0x for-range statement. This is often not obvious from the code, 1234ad762fcdc16b9e4705b12b09d92b8c026212b906Richard Smith/// nor from the diagnostics produced when analysing the implicit expressions 1235ad762fcdc16b9e4705b12b09d92b8c026212b906Richard Smith/// required in a for-range statement. 1236ad762fcdc16b9e4705b12b09d92b8c026212b906Richard Smithvoid NoteForRangeBeginEndFunction(Sema &SemaRef, Expr *E, 1237ad762fcdc16b9e4705b12b09d92b8c026212b906Richard Smith BeginEndFunction BEF) { 1238ad762fcdc16b9e4705b12b09d92b8c026212b906Richard Smith CallExpr *CE = dyn_cast<CallExpr>(E); 1239ad762fcdc16b9e4705b12b09d92b8c026212b906Richard Smith if (!CE) 1240ad762fcdc16b9e4705b12b09d92b8c026212b906Richard Smith return; 1241ad762fcdc16b9e4705b12b09d92b8c026212b906Richard Smith FunctionDecl *D = dyn_cast<FunctionDecl>(CE->getCalleeDecl()); 1242ad762fcdc16b9e4705b12b09d92b8c026212b906Richard Smith if (!D) 1243ad762fcdc16b9e4705b12b09d92b8c026212b906Richard Smith return; 1244ad762fcdc16b9e4705b12b09d92b8c026212b906Richard Smith SourceLocation Loc = D->getLocation(); 1245ad762fcdc16b9e4705b12b09d92b8c026212b906Richard Smith 1246ad762fcdc16b9e4705b12b09d92b8c026212b906Richard Smith std::string Description; 1247ad762fcdc16b9e4705b12b09d92b8c026212b906Richard Smith bool IsTemplate = false; 1248ad762fcdc16b9e4705b12b09d92b8c026212b906Richard Smith if (FunctionTemplateDecl *FunTmpl = D->getPrimaryTemplate()) { 1249ad762fcdc16b9e4705b12b09d92b8c026212b906Richard Smith Description = SemaRef.getTemplateArgumentBindingsText( 1250ad762fcdc16b9e4705b12b09d92b8c026212b906Richard Smith FunTmpl->getTemplateParameters(), *D->getTemplateSpecializationArgs()); 1251ad762fcdc16b9e4705b12b09d92b8c026212b906Richard Smith IsTemplate = true; 1252ad762fcdc16b9e4705b12b09d92b8c026212b906Richard Smith } 1253ad762fcdc16b9e4705b12b09d92b8c026212b906Richard Smith 1254ad762fcdc16b9e4705b12b09d92b8c026212b906Richard Smith SemaRef.Diag(Loc, diag::note_for_range_begin_end) 1255ad762fcdc16b9e4705b12b09d92b8c026212b906Richard Smith << BEF << IsTemplate << Description << E->getType(); 1256ad762fcdc16b9e4705b12b09d92b8c026212b906Richard Smith} 1257ad762fcdc16b9e4705b12b09d92b8c026212b906Richard Smith 1258ad762fcdc16b9e4705b12b09d92b8c026212b906Richard Smith/// Build a call to 'begin' or 'end' for a C++0x for-range statement. If the 1259ad762fcdc16b9e4705b12b09d92b8c026212b906Richard Smith/// given LookupResult is non-empty, it is assumed to describe a member which 1260ad762fcdc16b9e4705b12b09d92b8c026212b906Richard Smith/// will be invoked. Otherwise, the function will be found via argument 1261ad762fcdc16b9e4705b12b09d92b8c026212b906Richard Smith/// dependent lookup. 1262ad762fcdc16b9e4705b12b09d92b8c026212b906Richard Smithstatic ExprResult BuildForRangeBeginEndCall(Sema &SemaRef, Scope *S, 1263ad762fcdc16b9e4705b12b09d92b8c026212b906Richard Smith SourceLocation Loc, 1264ad762fcdc16b9e4705b12b09d92b8c026212b906Richard Smith VarDecl *Decl, 1265ad762fcdc16b9e4705b12b09d92b8c026212b906Richard Smith BeginEndFunction BEF, 1266ad762fcdc16b9e4705b12b09d92b8c026212b906Richard Smith const DeclarationNameInfo &NameInfo, 1267ad762fcdc16b9e4705b12b09d92b8c026212b906Richard Smith LookupResult &MemberLookup, 1268ad762fcdc16b9e4705b12b09d92b8c026212b906Richard Smith Expr *Range) { 1269ad762fcdc16b9e4705b12b09d92b8c026212b906Richard Smith ExprResult CallExpr; 1270ad762fcdc16b9e4705b12b09d92b8c026212b906Richard Smith if (!MemberLookup.empty()) { 1271ad762fcdc16b9e4705b12b09d92b8c026212b906Richard Smith ExprResult MemberRef = 1272ad762fcdc16b9e4705b12b09d92b8c026212b906Richard Smith SemaRef.BuildMemberReferenceExpr(Range, Range->getType(), Loc, 1273ad762fcdc16b9e4705b12b09d92b8c026212b906Richard Smith /*IsPtr=*/false, CXXScopeSpec(), 1274ad762fcdc16b9e4705b12b09d92b8c026212b906Richard Smith /*Qualifier=*/0, MemberLookup, 1275ad762fcdc16b9e4705b12b09d92b8c026212b906Richard Smith /*TemplateArgs=*/0); 1276ad762fcdc16b9e4705b12b09d92b8c026212b906Richard Smith if (MemberRef.isInvalid()) 1277ad762fcdc16b9e4705b12b09d92b8c026212b906Richard Smith return ExprError(); 1278ad762fcdc16b9e4705b12b09d92b8c026212b906Richard Smith CallExpr = SemaRef.ActOnCallExpr(S, MemberRef.get(), Loc, MultiExprArg(), 1279ad762fcdc16b9e4705b12b09d92b8c026212b906Richard Smith Loc, 0); 1280ad762fcdc16b9e4705b12b09d92b8c026212b906Richard Smith if (CallExpr.isInvalid()) 1281ad762fcdc16b9e4705b12b09d92b8c026212b906Richard Smith return ExprError(); 1282ad762fcdc16b9e4705b12b09d92b8c026212b906Richard Smith } else { 1283ad762fcdc16b9e4705b12b09d92b8c026212b906Richard Smith UnresolvedSet<0> FoundNames; 1284ad762fcdc16b9e4705b12b09d92b8c026212b906Richard Smith // C++0x [stmt.ranged]p1: For the purposes of this name lookup, namespace 1285ad762fcdc16b9e4705b12b09d92b8c026212b906Richard Smith // std is an associated namespace. 1286ad762fcdc16b9e4705b12b09d92b8c026212b906Richard Smith UnresolvedLookupExpr *Fn = 1287ad762fcdc16b9e4705b12b09d92b8c026212b906Richard Smith UnresolvedLookupExpr::Create(SemaRef.Context, /*NamingClass=*/0, 1288ad762fcdc16b9e4705b12b09d92b8c026212b906Richard Smith NestedNameSpecifierLoc(), NameInfo, 1289ad762fcdc16b9e4705b12b09d92b8c026212b906Richard Smith /*NeedsADL=*/true, /*Overloaded=*/false, 1290ad762fcdc16b9e4705b12b09d92b8c026212b906Richard Smith FoundNames.begin(), FoundNames.end(), 1291ad762fcdc16b9e4705b12b09d92b8c026212b906Richard Smith /*LookInStdNamespace=*/true); 1292ad762fcdc16b9e4705b12b09d92b8c026212b906Richard Smith CallExpr = SemaRef.BuildOverloadedCallExpr(S, Fn, Fn, Loc, &Range, 1, Loc, 1293ad762fcdc16b9e4705b12b09d92b8c026212b906Richard Smith 0); 1294ad762fcdc16b9e4705b12b09d92b8c026212b906Richard Smith if (CallExpr.isInvalid()) { 1295ad762fcdc16b9e4705b12b09d92b8c026212b906Richard Smith SemaRef.Diag(Range->getLocStart(), diag::note_for_range_type) 1296ad762fcdc16b9e4705b12b09d92b8c026212b906Richard Smith << Range->getType(); 1297ad762fcdc16b9e4705b12b09d92b8c026212b906Richard Smith return ExprError(); 1298ad762fcdc16b9e4705b12b09d92b8c026212b906Richard Smith } 1299ad762fcdc16b9e4705b12b09d92b8c026212b906Richard Smith } 1300ad762fcdc16b9e4705b12b09d92b8c026212b906Richard Smith if (FinishForRangeVarDecl(SemaRef, Decl, CallExpr.get(), Loc, 1301ad762fcdc16b9e4705b12b09d92b8c026212b906Richard Smith diag::err_for_range_iter_deduction_failure)) { 1302ad762fcdc16b9e4705b12b09d92b8c026212b906Richard Smith NoteForRangeBeginEndFunction(SemaRef, CallExpr.get(), BEF); 1303ad762fcdc16b9e4705b12b09d92b8c026212b906Richard Smith return ExprError(); 1304ad762fcdc16b9e4705b12b09d92b8c026212b906Richard Smith } 1305ad762fcdc16b9e4705b12b09d92b8c026212b906Richard Smith return CallExpr; 1306ad762fcdc16b9e4705b12b09d92b8c026212b906Richard Smith} 1307ad762fcdc16b9e4705b12b09d92b8c026212b906Richard Smith 1308ad762fcdc16b9e4705b12b09d92b8c026212b906Richard Smith} 1309ad762fcdc16b9e4705b12b09d92b8c026212b906Richard Smith 1310ad762fcdc16b9e4705b12b09d92b8c026212b906Richard Smith/// ActOnCXXForRangeStmt - Check and build a C++0x for-range statement. 1311ad762fcdc16b9e4705b12b09d92b8c026212b906Richard Smith/// 1312ad762fcdc16b9e4705b12b09d92b8c026212b906Richard Smith/// C++0x [stmt.ranged]: 1313ad762fcdc16b9e4705b12b09d92b8c026212b906Richard Smith/// A range-based for statement is equivalent to 1314ad762fcdc16b9e4705b12b09d92b8c026212b906Richard Smith/// 1315ad762fcdc16b9e4705b12b09d92b8c026212b906Richard Smith/// { 1316ad762fcdc16b9e4705b12b09d92b8c026212b906Richard Smith/// auto && __range = range-init; 1317ad762fcdc16b9e4705b12b09d92b8c026212b906Richard Smith/// for ( auto __begin = begin-expr, 1318ad762fcdc16b9e4705b12b09d92b8c026212b906Richard Smith/// __end = end-expr; 1319ad762fcdc16b9e4705b12b09d92b8c026212b906Richard Smith/// __begin != __end; 1320ad762fcdc16b9e4705b12b09d92b8c026212b906Richard Smith/// ++__begin ) { 1321ad762fcdc16b9e4705b12b09d92b8c026212b906Richard Smith/// for-range-declaration = *__begin; 1322ad762fcdc16b9e4705b12b09d92b8c026212b906Richard Smith/// statement 1323ad762fcdc16b9e4705b12b09d92b8c026212b906Richard Smith/// } 1324ad762fcdc16b9e4705b12b09d92b8c026212b906Richard Smith/// } 1325ad762fcdc16b9e4705b12b09d92b8c026212b906Richard Smith/// 1326ad762fcdc16b9e4705b12b09d92b8c026212b906Richard Smith/// The body of the loop is not available yet, since it cannot be analysed until 1327ad762fcdc16b9e4705b12b09d92b8c026212b906Richard Smith/// we have determined the type of the for-range-declaration. 1328ad762fcdc16b9e4705b12b09d92b8c026212b906Richard SmithStmtResult 1329ad762fcdc16b9e4705b12b09d92b8c026212b906Richard SmithSema::ActOnCXXForRangeStmt(SourceLocation ForLoc, SourceLocation LParenLoc, 1330ad762fcdc16b9e4705b12b09d92b8c026212b906Richard Smith Stmt *First, SourceLocation ColonLoc, Expr *Range, 1331ad762fcdc16b9e4705b12b09d92b8c026212b906Richard Smith SourceLocation RParenLoc) { 1332ad762fcdc16b9e4705b12b09d92b8c026212b906Richard Smith if (!First || !Range) 1333ad762fcdc16b9e4705b12b09d92b8c026212b906Richard Smith return StmtError(); 1334ad762fcdc16b9e4705b12b09d92b8c026212b906Richard Smith 1335ad762fcdc16b9e4705b12b09d92b8c026212b906Richard Smith DeclStmt *DS = dyn_cast<DeclStmt>(First); 1336ad762fcdc16b9e4705b12b09d92b8c026212b906Richard Smith assert(DS && "first part of for range not a decl stmt"); 1337ad762fcdc16b9e4705b12b09d92b8c026212b906Richard Smith 1338ad762fcdc16b9e4705b12b09d92b8c026212b906Richard Smith if (!DS->isSingleDecl()) { 1339ad762fcdc16b9e4705b12b09d92b8c026212b906Richard Smith Diag(DS->getStartLoc(), diag::err_type_defined_in_for_range); 1340ad762fcdc16b9e4705b12b09d92b8c026212b906Richard Smith return StmtError(); 1341ad762fcdc16b9e4705b12b09d92b8c026212b906Richard Smith } 1342ad762fcdc16b9e4705b12b09d92b8c026212b906Richard Smith if (DS->getSingleDecl()->isInvalidDecl()) 1343ad762fcdc16b9e4705b12b09d92b8c026212b906Richard Smith return StmtError(); 1344ad762fcdc16b9e4705b12b09d92b8c026212b906Richard Smith 1345ad762fcdc16b9e4705b12b09d92b8c026212b906Richard Smith if (DiagnoseUnexpandedParameterPack(Range, UPPC_Expression)) 1346ad762fcdc16b9e4705b12b09d92b8c026212b906Richard Smith return StmtError(); 1347ad762fcdc16b9e4705b12b09d92b8c026212b906Richard Smith 1348ad762fcdc16b9e4705b12b09d92b8c026212b906Richard Smith // Build auto && __range = range-init 1349ad762fcdc16b9e4705b12b09d92b8c026212b906Richard Smith SourceLocation RangeLoc = Range->getLocStart(); 1350ad762fcdc16b9e4705b12b09d92b8c026212b906Richard Smith VarDecl *RangeVar = BuildForRangeVarDecl(*this, RangeLoc, 1351ad762fcdc16b9e4705b12b09d92b8c026212b906Richard Smith Context.getAutoRRefDeductType(), 1352ad762fcdc16b9e4705b12b09d92b8c026212b906Richard Smith "__range"); 1353ad762fcdc16b9e4705b12b09d92b8c026212b906Richard Smith if (FinishForRangeVarDecl(*this, RangeVar, Range, RangeLoc, 1354ad762fcdc16b9e4705b12b09d92b8c026212b906Richard Smith diag::err_for_range_deduction_failure)) 1355ad762fcdc16b9e4705b12b09d92b8c026212b906Richard Smith return StmtError(); 1356ad762fcdc16b9e4705b12b09d92b8c026212b906Richard Smith 1357ad762fcdc16b9e4705b12b09d92b8c026212b906Richard Smith // Claim the type doesn't contain auto: we've already done the checking. 1358ad762fcdc16b9e4705b12b09d92b8c026212b906Richard Smith DeclGroupPtrTy RangeGroup = 1359ad762fcdc16b9e4705b12b09d92b8c026212b906Richard Smith BuildDeclaratorGroup((Decl**)&RangeVar, 1, /*TypeMayContainAuto=*/false); 1360ad762fcdc16b9e4705b12b09d92b8c026212b906Richard Smith StmtResult RangeDecl = ActOnDeclStmt(RangeGroup, RangeLoc, RangeLoc); 1361ad762fcdc16b9e4705b12b09d92b8c026212b906Richard Smith if (RangeDecl.isInvalid()) 1362ad762fcdc16b9e4705b12b09d92b8c026212b906Richard Smith return StmtError(); 1363ad762fcdc16b9e4705b12b09d92b8c026212b906Richard Smith 1364ad762fcdc16b9e4705b12b09d92b8c026212b906Richard Smith return BuildCXXForRangeStmt(ForLoc, ColonLoc, RangeDecl.get(), 1365ad762fcdc16b9e4705b12b09d92b8c026212b906Richard Smith /*BeginEndDecl=*/0, /*Cond=*/0, /*Inc=*/0, DS, 1366ad762fcdc16b9e4705b12b09d92b8c026212b906Richard Smith RParenLoc); 1367ad762fcdc16b9e4705b12b09d92b8c026212b906Richard Smith} 1368ad762fcdc16b9e4705b12b09d92b8c026212b906Richard Smith 1369ad762fcdc16b9e4705b12b09d92b8c026212b906Richard Smith/// BuildCXXForRangeStmt - Build or instantiate a C++0x for-range statement. 1370ad762fcdc16b9e4705b12b09d92b8c026212b906Richard SmithStmtResult 1371ad762fcdc16b9e4705b12b09d92b8c026212b906Richard SmithSema::BuildCXXForRangeStmt(SourceLocation ForLoc, SourceLocation ColonLoc, 1372ad762fcdc16b9e4705b12b09d92b8c026212b906Richard Smith Stmt *RangeDecl, Stmt *BeginEnd, Expr *Cond, 1373ad762fcdc16b9e4705b12b09d92b8c026212b906Richard Smith Expr *Inc, Stmt *LoopVarDecl, 1374ad762fcdc16b9e4705b12b09d92b8c026212b906Richard Smith SourceLocation RParenLoc) { 1375ad762fcdc16b9e4705b12b09d92b8c026212b906Richard Smith Scope *S = getCurScope(); 1376ad762fcdc16b9e4705b12b09d92b8c026212b906Richard Smith 1377ad762fcdc16b9e4705b12b09d92b8c026212b906Richard Smith DeclStmt *RangeDS = cast<DeclStmt>(RangeDecl); 1378ad762fcdc16b9e4705b12b09d92b8c026212b906Richard Smith VarDecl *RangeVar = cast<VarDecl>(RangeDS->getSingleDecl()); 1379ad762fcdc16b9e4705b12b09d92b8c026212b906Richard Smith QualType RangeVarType = RangeVar->getType(); 1380ad762fcdc16b9e4705b12b09d92b8c026212b906Richard Smith 1381ad762fcdc16b9e4705b12b09d92b8c026212b906Richard Smith DeclStmt *LoopVarDS = cast<DeclStmt>(LoopVarDecl); 1382ad762fcdc16b9e4705b12b09d92b8c026212b906Richard Smith VarDecl *LoopVar = cast<VarDecl>(LoopVarDS->getSingleDecl()); 1383ad762fcdc16b9e4705b12b09d92b8c026212b906Richard Smith 1384ad762fcdc16b9e4705b12b09d92b8c026212b906Richard Smith StmtResult BeginEndDecl = BeginEnd; 1385ad762fcdc16b9e4705b12b09d92b8c026212b906Richard Smith ExprResult NotEqExpr = Cond, IncrExpr = Inc; 1386ad762fcdc16b9e4705b12b09d92b8c026212b906Richard Smith 1387ad762fcdc16b9e4705b12b09d92b8c026212b906Richard Smith if (!BeginEndDecl.get() && !RangeVarType->isDependentType()) { 1388ad762fcdc16b9e4705b12b09d92b8c026212b906Richard Smith SourceLocation RangeLoc = RangeVar->getLocation(); 1389ad762fcdc16b9e4705b12b09d92b8c026212b906Richard Smith 1390ad762fcdc16b9e4705b12b09d92b8c026212b906Richard Smith ExprResult RangeRef = BuildDeclRefExpr(RangeVar, 1391ad762fcdc16b9e4705b12b09d92b8c026212b906Richard Smith RangeVarType.getNonReferenceType(), 1392ad762fcdc16b9e4705b12b09d92b8c026212b906Richard Smith VK_LValue, ColonLoc); 1393ad762fcdc16b9e4705b12b09d92b8c026212b906Richard Smith if (RangeRef.isInvalid()) 1394ad762fcdc16b9e4705b12b09d92b8c026212b906Richard Smith return StmtError(); 1395ad762fcdc16b9e4705b12b09d92b8c026212b906Richard Smith 1396ad762fcdc16b9e4705b12b09d92b8c026212b906Richard Smith QualType AutoType = Context.getAutoDeductType(); 1397ad762fcdc16b9e4705b12b09d92b8c026212b906Richard Smith Expr *Range = RangeVar->getInit(); 1398ad762fcdc16b9e4705b12b09d92b8c026212b906Richard Smith if (!Range) 1399ad762fcdc16b9e4705b12b09d92b8c026212b906Richard Smith return StmtError(); 1400ad762fcdc16b9e4705b12b09d92b8c026212b906Richard Smith QualType RangeType = Range->getType(); 1401ad762fcdc16b9e4705b12b09d92b8c026212b906Richard Smith 1402ad762fcdc16b9e4705b12b09d92b8c026212b906Richard Smith if (RequireCompleteType(RangeLoc, RangeType, 1403ad762fcdc16b9e4705b12b09d92b8c026212b906Richard Smith PDiag(diag::err_for_range_incomplete_type))) 1404ad762fcdc16b9e4705b12b09d92b8c026212b906Richard Smith return StmtError(); 1405ad762fcdc16b9e4705b12b09d92b8c026212b906Richard Smith 1406ad762fcdc16b9e4705b12b09d92b8c026212b906Richard Smith // Build auto __begin = begin-expr, __end = end-expr. 1407ad762fcdc16b9e4705b12b09d92b8c026212b906Richard Smith VarDecl *BeginVar = BuildForRangeVarDecl(*this, ColonLoc, AutoType, 1408ad762fcdc16b9e4705b12b09d92b8c026212b906Richard Smith "__begin"); 1409ad762fcdc16b9e4705b12b09d92b8c026212b906Richard Smith VarDecl *EndVar = BuildForRangeVarDecl(*this, ColonLoc, AutoType, 1410ad762fcdc16b9e4705b12b09d92b8c026212b906Richard Smith "__end"); 1411ad762fcdc16b9e4705b12b09d92b8c026212b906Richard Smith 1412ad762fcdc16b9e4705b12b09d92b8c026212b906Richard Smith // Build begin-expr and end-expr and attach to __begin and __end variables. 1413ad762fcdc16b9e4705b12b09d92b8c026212b906Richard Smith ExprResult BeginExpr, EndExpr; 1414ad762fcdc16b9e4705b12b09d92b8c026212b906Richard Smith if (const ArrayType *UnqAT = RangeType->getAsArrayTypeUnsafe()) { 1415ad762fcdc16b9e4705b12b09d92b8c026212b906Richard Smith // - if _RangeT is an array type, begin-expr and end-expr are __range and 1416ad762fcdc16b9e4705b12b09d92b8c026212b906Richard Smith // __range + __bound, respectively, where __bound is the array bound. If 1417ad762fcdc16b9e4705b12b09d92b8c026212b906Richard Smith // _RangeT is an array of unknown size or an array of incomplete type, 1418ad762fcdc16b9e4705b12b09d92b8c026212b906Richard Smith // the program is ill-formed; 1419ad762fcdc16b9e4705b12b09d92b8c026212b906Richard Smith 1420ad762fcdc16b9e4705b12b09d92b8c026212b906Richard Smith // begin-expr is __range. 1421ad762fcdc16b9e4705b12b09d92b8c026212b906Richard Smith BeginExpr = RangeRef; 1422ad762fcdc16b9e4705b12b09d92b8c026212b906Richard Smith if (FinishForRangeVarDecl(*this, BeginVar, RangeRef.get(), ColonLoc, 1423ad762fcdc16b9e4705b12b09d92b8c026212b906Richard Smith diag::err_for_range_iter_deduction_failure)) { 1424ad762fcdc16b9e4705b12b09d92b8c026212b906Richard Smith NoteForRangeBeginEndFunction(*this, BeginExpr.get(), BEF_begin); 1425ad762fcdc16b9e4705b12b09d92b8c026212b906Richard Smith return StmtError(); 1426ad762fcdc16b9e4705b12b09d92b8c026212b906Richard Smith } 1427ad762fcdc16b9e4705b12b09d92b8c026212b906Richard Smith 1428ad762fcdc16b9e4705b12b09d92b8c026212b906Richard Smith // Find the array bound. 1429ad762fcdc16b9e4705b12b09d92b8c026212b906Richard Smith ExprResult BoundExpr; 1430ad762fcdc16b9e4705b12b09d92b8c026212b906Richard Smith if (const ConstantArrayType *CAT = dyn_cast<ConstantArrayType>(UnqAT)) 1431ad762fcdc16b9e4705b12b09d92b8c026212b906Richard Smith BoundExpr = Owned(IntegerLiteral::Create(Context, CAT->getSize(), 14321dd986dff9ddfbec687975700770bb377988e9edRichard Trieu Context.getPointerDiffType(), 14331dd986dff9ddfbec687975700770bb377988e9edRichard Trieu RangeLoc)); 1434ad762fcdc16b9e4705b12b09d92b8c026212b906Richard Smith else if (const VariableArrayType *VAT = 1435ad762fcdc16b9e4705b12b09d92b8c026212b906Richard Smith dyn_cast<VariableArrayType>(UnqAT)) 1436ad762fcdc16b9e4705b12b09d92b8c026212b906Richard Smith BoundExpr = VAT->getSizeExpr(); 1437ad762fcdc16b9e4705b12b09d92b8c026212b906Richard Smith else { 1438ad762fcdc16b9e4705b12b09d92b8c026212b906Richard Smith // Can't be a DependentSizedArrayType or an IncompleteArrayType since 1439ad762fcdc16b9e4705b12b09d92b8c026212b906Richard Smith // UnqAT is not incomplete and Range is not type-dependent. 1440ad762fcdc16b9e4705b12b09d92b8c026212b906Richard Smith assert(0 && "Unexpected array type in for-range"); 1441ad762fcdc16b9e4705b12b09d92b8c026212b906Richard Smith return StmtError(); 1442ad762fcdc16b9e4705b12b09d92b8c026212b906Richard Smith } 1443ad762fcdc16b9e4705b12b09d92b8c026212b906Richard Smith 1444ad762fcdc16b9e4705b12b09d92b8c026212b906Richard Smith // end-expr is __range + __bound. 1445ad762fcdc16b9e4705b12b09d92b8c026212b906Richard Smith EndExpr = ActOnBinOp(S, ColonLoc, tok::plus, RangeRef.get(), 1446ad762fcdc16b9e4705b12b09d92b8c026212b906Richard Smith BoundExpr.get()); 1447ad762fcdc16b9e4705b12b09d92b8c026212b906Richard Smith if (EndExpr.isInvalid()) 1448ad762fcdc16b9e4705b12b09d92b8c026212b906Richard Smith return StmtError(); 1449ad762fcdc16b9e4705b12b09d92b8c026212b906Richard Smith if (FinishForRangeVarDecl(*this, EndVar, EndExpr.get(), ColonLoc, 1450ad762fcdc16b9e4705b12b09d92b8c026212b906Richard Smith diag::err_for_range_iter_deduction_failure)) { 1451ad762fcdc16b9e4705b12b09d92b8c026212b906Richard Smith NoteForRangeBeginEndFunction(*this, EndExpr.get(), BEF_end); 1452ad762fcdc16b9e4705b12b09d92b8c026212b906Richard Smith return StmtError(); 1453ad762fcdc16b9e4705b12b09d92b8c026212b906Richard Smith } 1454ad762fcdc16b9e4705b12b09d92b8c026212b906Richard Smith } else { 1455ad762fcdc16b9e4705b12b09d92b8c026212b906Richard Smith DeclarationNameInfo BeginNameInfo(&PP.getIdentifierTable().get("begin"), 1456ad762fcdc16b9e4705b12b09d92b8c026212b906Richard Smith ColonLoc); 1457ad762fcdc16b9e4705b12b09d92b8c026212b906Richard Smith DeclarationNameInfo EndNameInfo(&PP.getIdentifierTable().get("end"), 1458ad762fcdc16b9e4705b12b09d92b8c026212b906Richard Smith ColonLoc); 1459ad762fcdc16b9e4705b12b09d92b8c026212b906Richard Smith 1460ad762fcdc16b9e4705b12b09d92b8c026212b906Richard Smith LookupResult BeginMemberLookup(*this, BeginNameInfo, LookupMemberName); 1461ad762fcdc16b9e4705b12b09d92b8c026212b906Richard Smith LookupResult EndMemberLookup(*this, EndNameInfo, LookupMemberName); 1462ad762fcdc16b9e4705b12b09d92b8c026212b906Richard Smith 1463ad762fcdc16b9e4705b12b09d92b8c026212b906Richard Smith if (CXXRecordDecl *D = RangeType->getAsCXXRecordDecl()) { 1464ad762fcdc16b9e4705b12b09d92b8c026212b906Richard Smith // - if _RangeT is a class type, the unqualified-ids begin and end are 1465ad762fcdc16b9e4705b12b09d92b8c026212b906Richard Smith // looked up in the scope of class _RangeT as if by class member access 1466ad762fcdc16b9e4705b12b09d92b8c026212b906Richard Smith // lookup (3.4.5), and if either (or both) finds at least one 1467ad762fcdc16b9e4705b12b09d92b8c026212b906Richard Smith // declaration, begin-expr and end-expr are __range.begin() and 1468ad762fcdc16b9e4705b12b09d92b8c026212b906Richard Smith // __range.end(), respectively; 1469ad762fcdc16b9e4705b12b09d92b8c026212b906Richard Smith LookupQualifiedName(BeginMemberLookup, D); 1470ad762fcdc16b9e4705b12b09d92b8c026212b906Richard Smith LookupQualifiedName(EndMemberLookup, D); 1471ad762fcdc16b9e4705b12b09d92b8c026212b906Richard Smith 1472ad762fcdc16b9e4705b12b09d92b8c026212b906Richard Smith if (BeginMemberLookup.empty() != EndMemberLookup.empty()) { 1473ad762fcdc16b9e4705b12b09d92b8c026212b906Richard Smith Diag(ColonLoc, diag::err_for_range_member_begin_end_mismatch) 1474ad762fcdc16b9e4705b12b09d92b8c026212b906Richard Smith << RangeType << BeginMemberLookup.empty(); 1475ad762fcdc16b9e4705b12b09d92b8c026212b906Richard Smith return StmtError(); 1476ad762fcdc16b9e4705b12b09d92b8c026212b906Richard Smith } 1477ad762fcdc16b9e4705b12b09d92b8c026212b906Richard Smith } else { 1478ad762fcdc16b9e4705b12b09d92b8c026212b906Richard Smith // - otherwise, begin-expr and end-expr are begin(__range) and 1479ad762fcdc16b9e4705b12b09d92b8c026212b906Richard Smith // end(__range), respectively, where begin and end are looked up with 1480ad762fcdc16b9e4705b12b09d92b8c026212b906Richard Smith // argument-dependent lookup (3.4.2). For the purposes of this name 1481ad762fcdc16b9e4705b12b09d92b8c026212b906Richard Smith // lookup, namespace std is an associated namespace. 1482ad762fcdc16b9e4705b12b09d92b8c026212b906Richard Smith } 1483ad762fcdc16b9e4705b12b09d92b8c026212b906Richard Smith 1484ad762fcdc16b9e4705b12b09d92b8c026212b906Richard Smith BeginExpr = BuildForRangeBeginEndCall(*this, S, ColonLoc, BeginVar, 1485ad762fcdc16b9e4705b12b09d92b8c026212b906Richard Smith BEF_begin, BeginNameInfo, 1486ad762fcdc16b9e4705b12b09d92b8c026212b906Richard Smith BeginMemberLookup, RangeRef.get()); 1487ad762fcdc16b9e4705b12b09d92b8c026212b906Richard Smith if (BeginExpr.isInvalid()) 1488ad762fcdc16b9e4705b12b09d92b8c026212b906Richard Smith return StmtError(); 1489ad762fcdc16b9e4705b12b09d92b8c026212b906Richard Smith 1490ad762fcdc16b9e4705b12b09d92b8c026212b906Richard Smith EndExpr = BuildForRangeBeginEndCall(*this, S, ColonLoc, EndVar, 1491ad762fcdc16b9e4705b12b09d92b8c026212b906Richard Smith BEF_end, EndNameInfo, 1492ad762fcdc16b9e4705b12b09d92b8c026212b906Richard Smith EndMemberLookup, RangeRef.get()); 1493ad762fcdc16b9e4705b12b09d92b8c026212b906Richard Smith if (EndExpr.isInvalid()) 1494ad762fcdc16b9e4705b12b09d92b8c026212b906Richard Smith return StmtError(); 1495ad762fcdc16b9e4705b12b09d92b8c026212b906Richard Smith } 1496ad762fcdc16b9e4705b12b09d92b8c026212b906Richard Smith 1497ad762fcdc16b9e4705b12b09d92b8c026212b906Richard Smith // C++0x [decl.spec.auto]p6: BeginType and EndType must be the same. 1498ad762fcdc16b9e4705b12b09d92b8c026212b906Richard Smith QualType BeginType = BeginVar->getType(), EndType = EndVar->getType(); 1499ad762fcdc16b9e4705b12b09d92b8c026212b906Richard Smith if (!Context.hasSameType(BeginType, EndType)) { 1500ad762fcdc16b9e4705b12b09d92b8c026212b906Richard Smith Diag(RangeLoc, diag::err_for_range_begin_end_types_differ) 1501ad762fcdc16b9e4705b12b09d92b8c026212b906Richard Smith << BeginType << EndType; 1502ad762fcdc16b9e4705b12b09d92b8c026212b906Richard Smith NoteForRangeBeginEndFunction(*this, BeginExpr.get(), BEF_begin); 1503ad762fcdc16b9e4705b12b09d92b8c026212b906Richard Smith NoteForRangeBeginEndFunction(*this, EndExpr.get(), BEF_end); 1504ad762fcdc16b9e4705b12b09d92b8c026212b906Richard Smith } 1505ad762fcdc16b9e4705b12b09d92b8c026212b906Richard Smith 1506ad762fcdc16b9e4705b12b09d92b8c026212b906Richard Smith Decl *BeginEndDecls[] = { BeginVar, EndVar }; 1507ad762fcdc16b9e4705b12b09d92b8c026212b906Richard Smith // Claim the type doesn't contain auto: we've already done the checking. 1508ad762fcdc16b9e4705b12b09d92b8c026212b906Richard Smith DeclGroupPtrTy BeginEndGroup = 1509ad762fcdc16b9e4705b12b09d92b8c026212b906Richard Smith BuildDeclaratorGroup(BeginEndDecls, 2, /*TypeMayContainAuto=*/false); 1510ad762fcdc16b9e4705b12b09d92b8c026212b906Richard Smith BeginEndDecl = ActOnDeclStmt(BeginEndGroup, ColonLoc, ColonLoc); 1511ad762fcdc16b9e4705b12b09d92b8c026212b906Richard Smith 1512ad762fcdc16b9e4705b12b09d92b8c026212b906Richard Smith ExprResult BeginRef = BuildDeclRefExpr(BeginVar, 1513ad762fcdc16b9e4705b12b09d92b8c026212b906Richard Smith BeginType.getNonReferenceType(), 1514ad762fcdc16b9e4705b12b09d92b8c026212b906Richard Smith VK_LValue, ColonLoc); 1515ad762fcdc16b9e4705b12b09d92b8c026212b906Richard Smith ExprResult EndRef = BuildDeclRefExpr(EndVar, EndType.getNonReferenceType(), 1516ad762fcdc16b9e4705b12b09d92b8c026212b906Richard Smith VK_LValue, ColonLoc); 1517ad762fcdc16b9e4705b12b09d92b8c026212b906Richard Smith 1518ad762fcdc16b9e4705b12b09d92b8c026212b906Richard Smith // Build and check __begin != __end expression. 1519ad762fcdc16b9e4705b12b09d92b8c026212b906Richard Smith NotEqExpr = ActOnBinOp(S, ColonLoc, tok::exclaimequal, 1520ad762fcdc16b9e4705b12b09d92b8c026212b906Richard Smith BeginRef.get(), EndRef.get()); 1521ad762fcdc16b9e4705b12b09d92b8c026212b906Richard Smith NotEqExpr = ActOnBooleanCondition(S, ColonLoc, NotEqExpr.get()); 1522ad762fcdc16b9e4705b12b09d92b8c026212b906Richard Smith NotEqExpr = ActOnFinishFullExpr(NotEqExpr.get()); 1523ad762fcdc16b9e4705b12b09d92b8c026212b906Richard Smith if (NotEqExpr.isInvalid()) { 1524ad762fcdc16b9e4705b12b09d92b8c026212b906Richard Smith NoteForRangeBeginEndFunction(*this, BeginExpr.get(), BEF_begin); 1525ad762fcdc16b9e4705b12b09d92b8c026212b906Richard Smith if (!Context.hasSameType(BeginType, EndType)) 1526ad762fcdc16b9e4705b12b09d92b8c026212b906Richard Smith NoteForRangeBeginEndFunction(*this, EndExpr.get(), BEF_end); 1527ad762fcdc16b9e4705b12b09d92b8c026212b906Richard Smith return StmtError(); 1528ad762fcdc16b9e4705b12b09d92b8c026212b906Richard Smith } 1529ad762fcdc16b9e4705b12b09d92b8c026212b906Richard Smith 1530ad762fcdc16b9e4705b12b09d92b8c026212b906Richard Smith // Build and check ++__begin expression. 1531ad762fcdc16b9e4705b12b09d92b8c026212b906Richard Smith IncrExpr = ActOnUnaryOp(S, ColonLoc, tok::plusplus, BeginRef.get()); 1532ad762fcdc16b9e4705b12b09d92b8c026212b906Richard Smith IncrExpr = ActOnFinishFullExpr(IncrExpr.get()); 1533ad762fcdc16b9e4705b12b09d92b8c026212b906Richard Smith if (IncrExpr.isInvalid()) { 1534ad762fcdc16b9e4705b12b09d92b8c026212b906Richard Smith NoteForRangeBeginEndFunction(*this, BeginExpr.get(), BEF_begin); 1535ad762fcdc16b9e4705b12b09d92b8c026212b906Richard Smith return StmtError(); 1536ad762fcdc16b9e4705b12b09d92b8c026212b906Richard Smith } 1537ad762fcdc16b9e4705b12b09d92b8c026212b906Richard Smith 1538ad762fcdc16b9e4705b12b09d92b8c026212b906Richard Smith // Build and check *__begin expression. 1539ad762fcdc16b9e4705b12b09d92b8c026212b906Richard Smith ExprResult DerefExpr = ActOnUnaryOp(S, ColonLoc, tok::star, BeginRef.get()); 1540ad762fcdc16b9e4705b12b09d92b8c026212b906Richard Smith if (DerefExpr.isInvalid()) { 1541ad762fcdc16b9e4705b12b09d92b8c026212b906Richard Smith NoteForRangeBeginEndFunction(*this, BeginExpr.get(), BEF_begin); 1542ad762fcdc16b9e4705b12b09d92b8c026212b906Richard Smith return StmtError(); 1543ad762fcdc16b9e4705b12b09d92b8c026212b906Richard Smith } 1544ad762fcdc16b9e4705b12b09d92b8c026212b906Richard Smith 1545ad762fcdc16b9e4705b12b09d92b8c026212b906Richard Smith // Attach *__begin as initializer for VD. 1546ad762fcdc16b9e4705b12b09d92b8c026212b906Richard Smith if (!LoopVar->isInvalidDecl()) { 1547ad762fcdc16b9e4705b12b09d92b8c026212b906Richard Smith AddInitializerToDecl(LoopVar, DerefExpr.get(), /*DirectInit=*/false, 1548ad762fcdc16b9e4705b12b09d92b8c026212b906Richard Smith /*TypeMayContainAuto=*/true); 1549ad762fcdc16b9e4705b12b09d92b8c026212b906Richard Smith if (LoopVar->isInvalidDecl()) 1550ad762fcdc16b9e4705b12b09d92b8c026212b906Richard Smith NoteForRangeBeginEndFunction(*this, BeginExpr.get(), BEF_begin); 1551ad762fcdc16b9e4705b12b09d92b8c026212b906Richard Smith } 1552cd6f36693ed40cef8c8639c04438d865187c1f73Richard Smith } else { 1553cd6f36693ed40cef8c8639c04438d865187c1f73Richard Smith // The range is implicitly used as a placeholder when it is dependent. 1554cd6f36693ed40cef8c8639c04438d865187c1f73Richard Smith RangeVar->setUsed(); 1555ad762fcdc16b9e4705b12b09d92b8c026212b906Richard Smith } 1556ad762fcdc16b9e4705b12b09d92b8c026212b906Richard Smith 1557ad762fcdc16b9e4705b12b09d92b8c026212b906Richard Smith return Owned(new (Context) CXXForRangeStmt(RangeDS, 1558ad762fcdc16b9e4705b12b09d92b8c026212b906Richard Smith cast_or_null<DeclStmt>(BeginEndDecl.get()), 1559ad762fcdc16b9e4705b12b09d92b8c026212b906Richard Smith NotEqExpr.take(), IncrExpr.take(), 1560ad762fcdc16b9e4705b12b09d92b8c026212b906Richard Smith LoopVarDS, /*Body=*/0, ForLoc, 1561ad762fcdc16b9e4705b12b09d92b8c026212b906Richard Smith ColonLoc, RParenLoc)); 1562ad762fcdc16b9e4705b12b09d92b8c026212b906Richard Smith} 1563ad762fcdc16b9e4705b12b09d92b8c026212b906Richard Smith 1564ad762fcdc16b9e4705b12b09d92b8c026212b906Richard Smith/// FinishCXXForRangeStmt - Attach the body to a C++0x for-range statement. 1565ad762fcdc16b9e4705b12b09d92b8c026212b906Richard Smith/// This is a separate step from ActOnCXXForRangeStmt because analysis of the 1566ad762fcdc16b9e4705b12b09d92b8c026212b906Richard Smith/// body cannot be performed until after the type of the range variable is 1567ad762fcdc16b9e4705b12b09d92b8c026212b906Richard Smith/// determined. 1568ad762fcdc16b9e4705b12b09d92b8c026212b906Richard SmithStmtResult Sema::FinishCXXForRangeStmt(Stmt *S, Stmt *B) { 1569ad762fcdc16b9e4705b12b09d92b8c026212b906Richard Smith if (!S || !B) 1570ad762fcdc16b9e4705b12b09d92b8c026212b906Richard Smith return StmtError(); 1571ad762fcdc16b9e4705b12b09d92b8c026212b906Richard Smith 1572ad762fcdc16b9e4705b12b09d92b8c026212b906Richard Smith cast<CXXForRangeStmt>(S)->setBody(B); 1573ad762fcdc16b9e4705b12b09d92b8c026212b906Richard Smith return S; 1574ad762fcdc16b9e4705b12b09d92b8c026212b906Richard Smith} 1575ad762fcdc16b9e4705b12b09d92b8c026212b906Richard Smith 157657ad37823e198f977cac605dbfbaefb4daf325e9Chris LattnerStmtResult Sema::ActOnGotoStmt(SourceLocation GotoLoc, 157757ad37823e198f977cac605dbfbaefb4daf325e9Chris Lattner SourceLocation LabelLoc, 157857ad37823e198f977cac605dbfbaefb4daf325e9Chris Lattner LabelDecl *TheDecl) { 157957ad37823e198f977cac605dbfbaefb4daf325e9Chris Lattner getCurFunction()->setHasBranchIntoScope(); 1580ad8dcf4a9df0e24051dc31bf9e6f3cd138a34298Chris Lattner TheDecl->setUsed(); 1581ad8dcf4a9df0e24051dc31bf9e6f3cd138a34298Chris Lattner return Owned(new (Context) GotoStmt(TheDecl, GotoLoc, LabelLoc)); 15825f016e2cb5d11daeb237544de1c5d59f20fe1a6eReid Spencer} 15835f016e2cb5d11daeb237544de1c5d59f20fe1a6eReid Spencer 158460d7b3a319d84d688752be3870615ac0f111fb16John McCallStmtResult 1585ad56d684259f706b7c0ae5ad9c23adb4f2926817Chris LattnerSema::ActOnIndirectGotoStmt(SourceLocation GotoLoc, SourceLocation StarLoc, 15869ae2f076ca5ab1feb3ba95629099ec2319833701John McCall Expr *E) { 1587bbf462314b1dc8e422b7c4dd4cac47e566aedf6dEli Friedman // Convert operand to void* 15885f1b9e689fa5c101512aef99225f2afea1673449Douglas Gregor if (!E->isTypeDependent()) { 15895f1b9e689fa5c101512aef99225f2afea1673449Douglas Gregor QualType ETy = E->getType(); 15902877998bd8db2fac1c56430a4edcfa0ce138aff9Chandler Carruth QualType DestTy = Context.getPointerType(Context.VoidTy.withConst()); 1591429bb276991ff2dbc7c5b438828b9b7737cb15ebJohn Wiegley ExprResult ExprRes = Owned(E); 15925f1b9e689fa5c101512aef99225f2afea1673449Douglas Gregor AssignConvertType ConvTy = 1593429bb276991ff2dbc7c5b438828b9b7737cb15ebJohn Wiegley CheckSingleAssignmentConstraints(DestTy, ExprRes); 1594429bb276991ff2dbc7c5b438828b9b7737cb15ebJohn Wiegley if (ExprRes.isInvalid()) 1595429bb276991ff2dbc7c5b438828b9b7737cb15ebJohn Wiegley return StmtError(); 1596429bb276991ff2dbc7c5b438828b9b7737cb15ebJohn Wiegley E = ExprRes.take(); 15972877998bd8db2fac1c56430a4edcfa0ce138aff9Chandler Carruth if (DiagnoseAssignmentResult(ConvTy, StarLoc, DestTy, ETy, E, AA_Passing)) 15985f1b9e689fa5c101512aef99225f2afea1673449Douglas Gregor return StmtError(); 15995f1b9e689fa5c101512aef99225f2afea1673449Douglas Gregor } 1600b60a77e453d32db0ab1914d28e175c2defc0eb65John McCall 1601781472fe99a120098c631b0cbe33c89f8cef5e70John McCall getCurFunction()->setHasIndirectGoto(); 1602b60a77e453d32db0ab1914d28e175c2defc0eb65John McCall 16035f1b9e689fa5c101512aef99225f2afea1673449Douglas Gregor return Owned(new (Context) IndirectGotoStmt(GotoLoc, StarLoc, E)); 16045f016e2cb5d11daeb237544de1c5d59f20fe1a6eReid Spencer} 16055f016e2cb5d11daeb237544de1c5d59f20fe1a6eReid Spencer 160660d7b3a319d84d688752be3870615ac0f111fb16John McCallStmtResult 16071b273c403734d343d720acb28f04011807c8aa56Steve NaroffSema::ActOnContinueStmt(SourceLocation ContinueLoc, Scope *CurScope) { 16085f016e2cb5d11daeb237544de1c5d59f20fe1a6eReid Spencer Scope *S = CurScope->getContinueParent(); 16095f016e2cb5d11daeb237544de1c5d59f20fe1a6eReid Spencer if (!S) { 16105f016e2cb5d11daeb237544de1c5d59f20fe1a6eReid Spencer // C99 6.8.6.2p1: A break shall appear only in or as a loop body. 16114cffe2fd5c23168bc08f0453c684cbd3f79471d3Sebastian Redl return StmtError(Diag(ContinueLoc, diag::err_continue_not_in_loop)); 16125f016e2cb5d11daeb237544de1c5d59f20fe1a6eReid Spencer } 16134cffe2fd5c23168bc08f0453c684cbd3f79471d3Sebastian Redl 16148189cde56b4f6f938cd65f53c932fe1860d0204cTed Kremenek return Owned(new (Context) ContinueStmt(ContinueLoc)); 16155f016e2cb5d11daeb237544de1c5d59f20fe1a6eReid Spencer} 16165f016e2cb5d11daeb237544de1c5d59f20fe1a6eReid Spencer 161760d7b3a319d84d688752be3870615ac0f111fb16John McCallStmtResult 16181b273c403734d343d720acb28f04011807c8aa56Steve NaroffSema::ActOnBreakStmt(SourceLocation BreakLoc, Scope *CurScope) { 16195f016e2cb5d11daeb237544de1c5d59f20fe1a6eReid Spencer Scope *S = CurScope->getBreakParent(); 16205f016e2cb5d11daeb237544de1c5d59f20fe1a6eReid Spencer if (!S) { 16215f016e2cb5d11daeb237544de1c5d59f20fe1a6eReid Spencer // C99 6.8.6.3p1: A break shall appear only in or as a switch/loop body. 16224cffe2fd5c23168bc08f0453c684cbd3f79471d3Sebastian Redl return StmtError(Diag(BreakLoc, diag::err_break_not_in_loop_or_switch)); 16235f016e2cb5d11daeb237544de1c5d59f20fe1a6eReid Spencer } 16244cffe2fd5c23168bc08f0453c684cbd3f79471d3Sebastian Redl 16258189cde56b4f6f938cd65f53c932fe1860d0204cTed Kremenek return Owned(new (Context) BreakStmt(BreakLoc)); 16265f016e2cb5d11daeb237544de1c5d59f20fe1a6eReid Spencer} 16275f016e2cb5d11daeb237544de1c5d59f20fe1a6eReid Spencer 1628dfbb02a16ac8c764b5ba1742450513d6212d2f9fNAKAMURA Takumi/// \brief Determine whether the given expression is a candidate for 1629f5d8f466c3eebaffc51468812bdcbe7f0fe4891aDouglas Gregor/// copy elision in either a return statement or a throw expression. 16305077c3876beeaed32280af88244e8050078619a8Douglas Gregor/// 1631f5d8f466c3eebaffc51468812bdcbe7f0fe4891aDouglas Gregor/// \param ReturnType If we're determining the copy elision candidate for 1632f5d8f466c3eebaffc51468812bdcbe7f0fe4891aDouglas Gregor/// a return statement, this is the return type of the function. If we're 1633f5d8f466c3eebaffc51468812bdcbe7f0fe4891aDouglas Gregor/// determining the copy elision candidate for a throw expression, this will 1634f5d8f466c3eebaffc51468812bdcbe7f0fe4891aDouglas Gregor/// be a NULL type. 16355077c3876beeaed32280af88244e8050078619a8Douglas Gregor/// 1636f5d8f466c3eebaffc51468812bdcbe7f0fe4891aDouglas Gregor/// \param E The expression being returned from the function or block, or 1637f5d8f466c3eebaffc51468812bdcbe7f0fe4891aDouglas Gregor/// being thrown. 16385077c3876beeaed32280af88244e8050078619a8Douglas Gregor/// 16394926d832aa2f0af9d7c00633727d49e7967eb978Douglas Gregor/// \param AllowFunctionParameter Whether we allow function parameters to 16404926d832aa2f0af9d7c00633727d49e7967eb978Douglas Gregor/// be considered NRVO candidates. C++ prohibits this for NRVO itself, but 16414926d832aa2f0af9d7c00633727d49e7967eb978Douglas Gregor/// we re-use this logic to determine whether we should try to move as part of 16424926d832aa2f0af9d7c00633727d49e7967eb978Douglas Gregor/// a return or throw (which does allow function parameters). 16435077c3876beeaed32280af88244e8050078619a8Douglas Gregor/// 16445077c3876beeaed32280af88244e8050078619a8Douglas Gregor/// \returns The NRVO candidate variable, if the return statement may use the 16455077c3876beeaed32280af88244e8050078619a8Douglas Gregor/// NRVO, or NULL if there is no such candidate. 1646f5d8f466c3eebaffc51468812bdcbe7f0fe4891aDouglas Gregorconst VarDecl *Sema::getCopyElisionCandidate(QualType ReturnType, 1647f5d8f466c3eebaffc51468812bdcbe7f0fe4891aDouglas Gregor Expr *E, 1648f5d8f466c3eebaffc51468812bdcbe7f0fe4891aDouglas Gregor bool AllowFunctionParameter) { 1649f5d8f466c3eebaffc51468812bdcbe7f0fe4891aDouglas Gregor QualType ExprType = E->getType(); 16503c9034cb7ff1d6c1e4ecd1b44c98f553df013c7cDouglas Gregor // - in a return statement in a function with ... 16513c9034cb7ff1d6c1e4ecd1b44c98f553df013c7cDouglas Gregor // ... a class return type ... 1652f5d8f466c3eebaffc51468812bdcbe7f0fe4891aDouglas Gregor if (!ReturnType.isNull()) { 1653f5d8f466c3eebaffc51468812bdcbe7f0fe4891aDouglas Gregor if (!ReturnType->isRecordType()) 1654f5d8f466c3eebaffc51468812bdcbe7f0fe4891aDouglas Gregor return 0; 1655f5d8f466c3eebaffc51468812bdcbe7f0fe4891aDouglas Gregor // ... the same cv-unqualified type as the function return type ... 1656f5d8f466c3eebaffc51468812bdcbe7f0fe4891aDouglas Gregor if (!Context.hasSameUnqualifiedType(ReturnType, ExprType)) 1657f5d8f466c3eebaffc51468812bdcbe7f0fe4891aDouglas Gregor return 0; 1658f5d8f466c3eebaffc51468812bdcbe7f0fe4891aDouglas Gregor } 1659dfbb02a16ac8c764b5ba1742450513d6212d2f9fNAKAMURA Takumi 1660dfbb02a16ac8c764b5ba1742450513d6212d2f9fNAKAMURA Takumi // ... the expression is the name of a non-volatile automatic object 1661f5d8f466c3eebaffc51468812bdcbe7f0fe4891aDouglas Gregor // (other than a function or catch-clause parameter)) ... 1662f5d8f466c3eebaffc51468812bdcbe7f0fe4891aDouglas Gregor const DeclRefExpr *DR = dyn_cast<DeclRefExpr>(E->IgnoreParens()); 16633c9034cb7ff1d6c1e4ecd1b44c98f553df013c7cDouglas Gregor if (!DR) 16645077c3876beeaed32280af88244e8050078619a8Douglas Gregor return 0; 16653c9034cb7ff1d6c1e4ecd1b44c98f553df013c7cDouglas Gregor const VarDecl *VD = dyn_cast<VarDecl>(DR->getDecl()); 16663c9034cb7ff1d6c1e4ecd1b44c98f553df013c7cDouglas Gregor if (!VD) 16675077c3876beeaed32280af88244e8050078619a8Douglas Gregor return 0; 1668dfbb02a16ac8c764b5ba1742450513d6212d2f9fNAKAMURA Takumi 1669f5d8f466c3eebaffc51468812bdcbe7f0fe4891aDouglas Gregor if (VD->hasLocalStorage() && !VD->isExceptionVariable() && 1670d86c477fb5d3fc34864afecbbb5443da9355e8fbDouglas Gregor !VD->getType()->isReferenceType() && !VD->hasAttr<BlocksAttr>() && 1671f5d8f466c3eebaffc51468812bdcbe7f0fe4891aDouglas Gregor !VD->getType().isVolatileQualified() && 16724a46c77813af1241139b81a086b539e4d734cb86Douglas Gregor ((VD->getKind() == Decl::Var) || 16734a46c77813af1241139b81a086b539e4d734cb86Douglas Gregor (AllowFunctionParameter && VD->getKind() == Decl::ParmVar))) 16745077c3876beeaed32280af88244e8050078619a8Douglas Gregor return VD; 1675dfbb02a16ac8c764b5ba1742450513d6212d2f9fNAKAMURA Takumi 16765077c3876beeaed32280af88244e8050078619a8Douglas Gregor return 0; 16773c9034cb7ff1d6c1e4ecd1b44c98f553df013c7cDouglas Gregor} 16783c9034cb7ff1d6c1e4ecd1b44c98f553df013c7cDouglas Gregor 167907f402cff25354c5f06f307f19b0c57c09d964bdDouglas Gregor/// \brief Perform the initialization of a potentially-movable value, which 168007f402cff25354c5f06f307f19b0c57c09d964bdDouglas Gregor/// is the result of return value. 1681cc15f010672a13b38104a32e3cefc7adc07ffbf7Douglas Gregor/// 1682cc15f010672a13b38104a32e3cefc7adc07ffbf7Douglas Gregor/// This routine implements C++0x [class.copy]p33, which attempts to treat 1683cc15f010672a13b38104a32e3cefc7adc07ffbf7Douglas Gregor/// returned lvalues as rvalues in certain cases (to prefer move construction), 1684cc15f010672a13b38104a32e3cefc7adc07ffbf7Douglas Gregor/// then falls back to treating them as lvalues if that failed. 1685dfbb02a16ac8c764b5ba1742450513d6212d2f9fNAKAMURA TakumiExprResult 168607f402cff25354c5f06f307f19b0c57c09d964bdDouglas GregorSema::PerformMoveOrCopyInitialization(const InitializedEntity &Entity, 168707f402cff25354c5f06f307f19b0c57c09d964bdDouglas Gregor const VarDecl *NRVOCandidate, 168807f402cff25354c5f06f307f19b0c57c09d964bdDouglas Gregor QualType ResultType, 1689bca01b46850f867b2f4137f25c882022b58f8471Douglas Gregor Expr *Value, 1690bca01b46850f867b2f4137f25c882022b58f8471Douglas Gregor bool AllowNRVO) { 1691cc15f010672a13b38104a32e3cefc7adc07ffbf7Douglas Gregor // C++0x [class.copy]p33: 1692dfbb02a16ac8c764b5ba1742450513d6212d2f9fNAKAMURA Takumi // When the criteria for elision of a copy operation are met or would 1693dfbb02a16ac8c764b5ba1742450513d6212d2f9fNAKAMURA Takumi // be met save for the fact that the source object is a function 1694dfbb02a16ac8c764b5ba1742450513d6212d2f9fNAKAMURA Takumi // parameter, and the object to be copied is designated by an lvalue, 1695cc15f010672a13b38104a32e3cefc7adc07ffbf7Douglas Gregor // overload resolution to select the constructor for the copy is first 1696cc15f010672a13b38104a32e3cefc7adc07ffbf7Douglas Gregor // performed as if the object were designated by an rvalue. 1697cc15f010672a13b38104a32e3cefc7adc07ffbf7Douglas Gregor ExprResult Res = ExprError(); 1698bca01b46850f867b2f4137f25c882022b58f8471Douglas Gregor if (AllowNRVO && 1699bca01b46850f867b2f4137f25c882022b58f8471Douglas Gregor (NRVOCandidate || getCopyElisionCandidate(ResultType, Value, true))) { 1700dfbb02a16ac8c764b5ba1742450513d6212d2f9fNAKAMURA Takumi ImplicitCastExpr AsRvalue(ImplicitCastExpr::OnStack, 170107f402cff25354c5f06f307f19b0c57c09d964bdDouglas Gregor Value->getType(), CK_LValueToRValue, 170207f402cff25354c5f06f307f19b0c57c09d964bdDouglas Gregor Value, VK_XValue); 1703dfbb02a16ac8c764b5ba1742450513d6212d2f9fNAKAMURA Takumi 1704cc15f010672a13b38104a32e3cefc7adc07ffbf7Douglas Gregor Expr *InitExpr = &AsRvalue; 1705dfbb02a16ac8c764b5ba1742450513d6212d2f9fNAKAMURA Takumi InitializationKind Kind 170607f402cff25354c5f06f307f19b0c57c09d964bdDouglas Gregor = InitializationKind::CreateCopy(Value->getLocStart(), 170707f402cff25354c5f06f307f19b0c57c09d964bdDouglas Gregor Value->getLocStart()); 170807f402cff25354c5f06f307f19b0c57c09d964bdDouglas Gregor InitializationSequence Seq(*this, Entity, Kind, &InitExpr, 1); 1709dfbb02a16ac8c764b5ba1742450513d6212d2f9fNAKAMURA Takumi 1710dfbb02a16ac8c764b5ba1742450513d6212d2f9fNAKAMURA Takumi // [...] If overload resolution fails, or if the type of the first 1711cc15f010672a13b38104a32e3cefc7adc07ffbf7Douglas Gregor // parameter of the selected constructor is not an rvalue reference 17120099530a2288df7c2140dd8992b7310b9f6930a9NAKAMURA Takumi // to the object's type (possibly cv-qualified), overload resolution 1713cc15f010672a13b38104a32e3cefc7adc07ffbf7Douglas Gregor // is performed again, considering the object as an lvalue. 1714383616cd2e61131a534afd9364ef53f643e1f834Sebastian Redl if (Seq) { 1715cc15f010672a13b38104a32e3cefc7adc07ffbf7Douglas Gregor for (InitializationSequence::step_iterator Step = Seq.step_begin(), 1716cc15f010672a13b38104a32e3cefc7adc07ffbf7Douglas Gregor StepEnd = Seq.step_end(); 1717cc15f010672a13b38104a32e3cefc7adc07ffbf7Douglas Gregor Step != StepEnd; ++Step) { 1718383616cd2e61131a534afd9364ef53f643e1f834Sebastian Redl if (Step->Kind != InitializationSequence::SK_ConstructorInitialization) 1719cc15f010672a13b38104a32e3cefc7adc07ffbf7Douglas Gregor continue; 1720dfbb02a16ac8c764b5ba1742450513d6212d2f9fNAKAMURA Takumi 1721dfbb02a16ac8c764b5ba1742450513d6212d2f9fNAKAMURA Takumi CXXConstructorDecl *Constructor 1722cc15f010672a13b38104a32e3cefc7adc07ffbf7Douglas Gregor = cast<CXXConstructorDecl>(Step->Function.Function); 1723dfbb02a16ac8c764b5ba1742450513d6212d2f9fNAKAMURA Takumi 1724cc15f010672a13b38104a32e3cefc7adc07ffbf7Douglas Gregor const RValueReferenceType *RRefType 172507f402cff25354c5f06f307f19b0c57c09d964bdDouglas Gregor = Constructor->getParamDecl(0)->getType() 172607f402cff25354c5f06f307f19b0c57c09d964bdDouglas Gregor ->getAs<RValueReferenceType>(); 1727dfbb02a16ac8c764b5ba1742450513d6212d2f9fNAKAMURA Takumi 1728cc15f010672a13b38104a32e3cefc7adc07ffbf7Douglas Gregor // If we don't meet the criteria, break out now. 1729dfbb02a16ac8c764b5ba1742450513d6212d2f9fNAKAMURA Takumi if (!RRefType || 173007f402cff25354c5f06f307f19b0c57c09d964bdDouglas Gregor !Context.hasSameUnqualifiedType(RRefType->getPointeeType(), 173107f402cff25354c5f06f307f19b0c57c09d964bdDouglas Gregor Context.getTypeDeclType(Constructor->getParent()))) 1732cc15f010672a13b38104a32e3cefc7adc07ffbf7Douglas Gregor break; 1733dfbb02a16ac8c764b5ba1742450513d6212d2f9fNAKAMURA Takumi 1734cc15f010672a13b38104a32e3cefc7adc07ffbf7Douglas Gregor // Promote "AsRvalue" to the heap, since we now need this 1735cc15f010672a13b38104a32e3cefc7adc07ffbf7Douglas Gregor // expression node to persist. 173607f402cff25354c5f06f307f19b0c57c09d964bdDouglas Gregor Value = ImplicitCastExpr::Create(Context, Value->getType(), 1737dfbb02a16ac8c764b5ba1742450513d6212d2f9fNAKAMURA Takumi CK_LValueToRValue, Value, 0, 173807f402cff25354c5f06f307f19b0c57c09d964bdDouglas Gregor VK_XValue); 1739dfbb02a16ac8c764b5ba1742450513d6212d2f9fNAKAMURA Takumi 1740cc15f010672a13b38104a32e3cefc7adc07ffbf7Douglas Gregor // Complete type-checking the initialization of the return type 1741cc15f010672a13b38104a32e3cefc7adc07ffbf7Douglas Gregor // using the constructor we found. 174207f402cff25354c5f06f307f19b0c57c09d964bdDouglas Gregor Res = Seq.Perform(*this, Entity, Kind, MultiExprArg(&Value, 1)); 1743cc15f010672a13b38104a32e3cefc7adc07ffbf7Douglas Gregor } 1744cc15f010672a13b38104a32e3cefc7adc07ffbf7Douglas Gregor } 1745cc15f010672a13b38104a32e3cefc7adc07ffbf7Douglas Gregor } 1746dfbb02a16ac8c764b5ba1742450513d6212d2f9fNAKAMURA Takumi 1747cc15f010672a13b38104a32e3cefc7adc07ffbf7Douglas Gregor // Either we didn't meet the criteria for treating an lvalue as an rvalue, 1748dfbb02a16ac8c764b5ba1742450513d6212d2f9fNAKAMURA Takumi // above, or overload resolution failed. Either way, we need to try 1749cc15f010672a13b38104a32e3cefc7adc07ffbf7Douglas Gregor // (again) now with the return value expression as written. 1750cc15f010672a13b38104a32e3cefc7adc07ffbf7Douglas Gregor if (Res.isInvalid()) 175107f402cff25354c5f06f307f19b0c57c09d964bdDouglas Gregor Res = PerformCopyInitialization(Entity, SourceLocation(), Value); 1752dfbb02a16ac8c764b5ba1742450513d6212d2f9fNAKAMURA Takumi 1753cc15f010672a13b38104a32e3cefc7adc07ffbf7Douglas Gregor return Res; 1754cc15f010672a13b38104a32e3cefc7adc07ffbf7Douglas Gregor} 1755cc15f010672a13b38104a32e3cefc7adc07ffbf7Douglas Gregor 175627c8dc06f65d7abcf6a7e7f64a7960c9a150ca01Douglas Gregor/// ActOnBlockReturnStmt - Utility routine to figure out block's return type. 17574eb206bebcdab28ababe8df55c6185cec2cdc071Steve Naroff/// 175860d7b3a319d84d688752be3870615ac0f111fb16John McCallStmtResult 17594eb206bebcdab28ababe8df55c6185cec2cdc071Steve NaroffSema::ActOnBlockReturnStmt(SourceLocation ReturnLoc, Expr *RetValExp) { 17604eb206bebcdab28ababe8df55c6185cec2cdc071Steve Naroff // If this is the first return we've seen in the block, infer the type of 17614eb206bebcdab28ababe8df55c6185cec2cdc071Steve Naroff // the block from it. 17629ea9bdbc14374f7bacdb50d3e52c664ff12150ffDouglas Gregor BlockScopeInfo *CurBlock = getCurBlock(); 17637d5c74ecbbd8719436c071f38657bc8e97ee4a24Fariborz Jahanian if (CurBlock->ReturnType.isNull()) { 1764c50a4a5f2eac14ac4c631d50b0a55cadc87700ceSteve Naroff if (RetValExp) { 176516564420ffe679b0e3cf310c418be6ef98d8e658Steve Naroff // Don't call UsualUnaryConversions(), since we don't want to do 176616564420ffe679b0e3cf310c418be6ef98d8e658Steve Naroff // integer promotions here. 1767429bb276991ff2dbc7c5b438828b9b7737cb15ebJohn Wiegley ExprResult Result = DefaultFunctionArrayLvalueConversion(RetValExp); 1768429bb276991ff2dbc7c5b438828b9b7737cb15ebJohn Wiegley if (Result.isInvalid()) 1769429bb276991ff2dbc7c5b438828b9b7737cb15ebJohn Wiegley return StmtError(); 1770429bb276991ff2dbc7c5b438828b9b7737cb15ebJohn Wiegley RetValExp = Result.take(); 17716a576ab708d3aa7d40e5d867ab1de5d3cb507553Douglas Gregor 17726a576ab708d3aa7d40e5d867ab1de5d3cb507553Douglas Gregor if (!RetValExp->isTypeDependent()) { 17736a576ab708d3aa7d40e5d867ab1de5d3cb507553Douglas Gregor CurBlock->ReturnType = RetValExp->getType(); 17746a576ab708d3aa7d40e5d867ab1de5d3cb507553Douglas Gregor if (BlockDeclRefExpr *CDRE = dyn_cast<BlockDeclRefExpr>(RetValExp)) { 17756a576ab708d3aa7d40e5d867ab1de5d3cb507553Douglas Gregor // We have to remove a 'const' added to copied-in variable which was 17766a576ab708d3aa7d40e5d867ab1de5d3cb507553Douglas Gregor // part of the implementation spec. and not the actual qualifier for 17776a576ab708d3aa7d40e5d867ab1de5d3cb507553Douglas Gregor // the variable. 17786a576ab708d3aa7d40e5d867ab1de5d3cb507553Douglas Gregor if (CDRE->isConstQualAdded()) 17796a576ab708d3aa7d40e5d867ab1de5d3cb507553Douglas Gregor CurBlock->ReturnType.removeLocalConst(); // FIXME: local??? 17806a576ab708d3aa7d40e5d867ab1de5d3cb507553Douglas Gregor } 17816a576ab708d3aa7d40e5d867ab1de5d3cb507553Douglas Gregor } else 17826a576ab708d3aa7d40e5d867ab1de5d3cb507553Douglas Gregor CurBlock->ReturnType = Context.DependentTy; 1783c50a4a5f2eac14ac4c631d50b0a55cadc87700ceSteve Naroff } else 17847d5c74ecbbd8719436c071f38657bc8e97ee4a24Fariborz Jahanian CurBlock->ReturnType = Context.VoidTy; 17854eb206bebcdab28ababe8df55c6185cec2cdc071Steve Naroff } 17867d5c74ecbbd8719436c071f38657bc8e97ee4a24Fariborz Jahanian QualType FnRetType = CurBlock->ReturnType; 17874cffe2fd5c23168bc08f0453c684cbd3f79471d3Sebastian Redl 1788711c52bb20d0c69063b52a99826fb7d2835501f1John McCall if (CurBlock->FunctionType->getAs<FunctionType>()->getNoReturnAttr()) { 17896c92fa75e62937f9738696840efcb258560f4568Mike Stump Diag(ReturnLoc, diag::err_noreturn_block_has_return_expr) 17906c92fa75e62937f9738696840efcb258560f4568Mike Stump << getCurFunctionOrMethodDecl()->getDeclName(); 17916c92fa75e62937f9738696840efcb258560f4568Mike Stump return StmtError(); 17926c92fa75e62937f9738696840efcb258560f4568Mike Stump } 17936c92fa75e62937f9738696840efcb258560f4568Mike Stump 17944eb206bebcdab28ababe8df55c6185cec2cdc071Steve Naroff // Otherwise, verify that this result type matches the previous one. We are 17954eb206bebcdab28ababe8df55c6185cec2cdc071Steve Naroff // pickier with blocks than for normal functions because we don't have GCC 17964eb206bebcdab28ababe8df55c6185cec2cdc071Steve Naroff // compatibility to worry about here. 17975077c3876beeaed32280af88244e8050078619a8Douglas Gregor ReturnStmt *Result = 0; 17984eb206bebcdab28ababe8df55c6185cec2cdc071Steve Naroff if (CurBlock->ReturnType->isVoidType()) { 1799bc3e64f37fe2c68ab4bfcedf6f428e0198f2e349Douglas Gregor if (RetValExp && !RetValExp->isTypeDependent() && 1800bc3e64f37fe2c68ab4bfcedf6f428e0198f2e349Douglas Gregor (!getLangOptions().CPlusPlus || !RetValExp->getType()->isVoidType())) { 18014eb206bebcdab28ababe8df55c6185cec2cdc071Steve Naroff Diag(ReturnLoc, diag::err_return_block_has_expr); 18024eb206bebcdab28ababe8df55c6185cec2cdc071Steve Naroff RetValExp = 0; 18034eb206bebcdab28ababe8df55c6185cec2cdc071Steve Naroff } 18045077c3876beeaed32280af88244e8050078619a8Douglas Gregor Result = new (Context) ReturnStmt(ReturnLoc, RetValExp, 0); 18055077c3876beeaed32280af88244e8050078619a8Douglas Gregor } else if (!RetValExp) { 1806bc3e64f37fe2c68ab4bfcedf6f428e0198f2e349Douglas Gregor if (!CurBlock->ReturnType->isDependentType()) 1807bc3e64f37fe2c68ab4bfcedf6f428e0198f2e349Douglas Gregor return StmtError(Diag(ReturnLoc, diag::err_block_return_missing_expr)); 1808bc3e64f37fe2c68ab4bfcedf6f428e0198f2e349Douglas Gregor 1809bc3e64f37fe2c68ab4bfcedf6f428e0198f2e349Douglas Gregor Result = new (Context) ReturnStmt(ReturnLoc, 0, 0); 18105077c3876beeaed32280af88244e8050078619a8Douglas Gregor } else { 18115077c3876beeaed32280af88244e8050078619a8Douglas Gregor const VarDecl *NRVOCandidate = 0; 1812dfbb02a16ac8c764b5ba1742450513d6212d2f9fNAKAMURA Takumi 18135077c3876beeaed32280af88244e8050078619a8Douglas Gregor if (!FnRetType->isDependentType() && !RetValExp->isTypeDependent()) { 18145077c3876beeaed32280af88244e8050078619a8Douglas Gregor // we have a non-void block with an expression, continue checking 18155077c3876beeaed32280af88244e8050078619a8Douglas Gregor 18165077c3876beeaed32280af88244e8050078619a8Douglas Gregor // C99 6.8.6.4p3(136): The return statement is not an assignment. The 18175077c3876beeaed32280af88244e8050078619a8Douglas Gregor // overlap restriction of subclause 6.5.16.1 does not apply to the case of 18185077c3876beeaed32280af88244e8050078619a8Douglas Gregor // function return. 18195077c3876beeaed32280af88244e8050078619a8Douglas Gregor 18205077c3876beeaed32280af88244e8050078619a8Douglas Gregor // In C++ the return statement is handled via a copy initialization. 18215077c3876beeaed32280af88244e8050078619a8Douglas Gregor // the C version of which boils down to CheckSingleAssignmentConstraints. 1822f5d8f466c3eebaffc51468812bdcbe7f0fe4891aDouglas Gregor NRVOCandidate = getCopyElisionCandidate(FnRetType, RetValExp, false); 1823dfbb02a16ac8c764b5ba1742450513d6212d2f9fNAKAMURA Takumi InitializedEntity Entity = InitializedEntity::InitializeResult(ReturnLoc, 182407f402cff25354c5f06f307f19b0c57c09d964bdDouglas Gregor FnRetType, 182507f402cff25354c5f06f307f19b0c57c09d964bdDouglas Gregor NRVOCandidate != 0); 1826dfbb02a16ac8c764b5ba1742450513d6212d2f9fNAKAMURA Takumi ExprResult Res = PerformMoveOrCopyInitialization(Entity, NRVOCandidate, 182707f402cff25354c5f06f307f19b0c57c09d964bdDouglas Gregor FnRetType, RetValExp); 18285077c3876beeaed32280af88244e8050078619a8Douglas Gregor if (Res.isInvalid()) { 18295077c3876beeaed32280af88244e8050078619a8Douglas Gregor // FIXME: Cleanup temporaries here, anyway? 18305077c3876beeaed32280af88244e8050078619a8Douglas Gregor return StmtError(); 18315077c3876beeaed32280af88244e8050078619a8Douglas Gregor } 1832dfbb02a16ac8c764b5ba1742450513d6212d2f9fNAKAMURA Takumi 1833b4eb64d8426c0eaa58d398961e0e74ff85063d7cJohn McCall if (RetValExp) { 1834b4eb64d8426c0eaa58d398961e0e74ff85063d7cJohn McCall CheckImplicitConversions(RetValExp, ReturnLoc); 18354765fa05b5652fcc4356371c2f481d0ea9a1b007John McCall RetValExp = MaybeCreateExprWithCleanups(RetValExp); 1836b4eb64d8426c0eaa58d398961e0e74ff85063d7cJohn McCall } 18374cffe2fd5c23168bc08f0453c684cbd3f79471d3Sebastian Redl 18385077c3876beeaed32280af88244e8050078619a8Douglas Gregor RetValExp = Res.takeAs<Expr>(); 1839dfbb02a16ac8c764b5ba1742450513d6212d2f9fNAKAMURA Takumi if (RetValExp) 18405077c3876beeaed32280af88244e8050078619a8Douglas Gregor CheckReturnStackAddr(RetValExp, FnRetType, ReturnLoc); 1841c6acbc58a7aef0a3382775424c80e9534b54b2edAnders Carlsson } 1842dfbb02a16ac8c764b5ba1742450513d6212d2f9fNAKAMURA Takumi 18435077c3876beeaed32280af88244e8050078619a8Douglas Gregor Result = new (Context) ReturnStmt(ReturnLoc, RetValExp, NRVOCandidate); 184498eb8a7a702b95183ed015706b1f1c66f5cb27a4Mike Stump } 18454cffe2fd5c23168bc08f0453c684cbd3f79471d3Sebastian Redl 1846dfbb02a16ac8c764b5ba1742450513d6212d2f9fNAKAMURA Takumi // If we need to check for the named return value optimization, save the 18475077c3876beeaed32280af88244e8050078619a8Douglas Gregor // return statement in our scope for later processing. 18486a576ab708d3aa7d40e5d867ab1de5d3cb507553Douglas Gregor if (getLangOptions().CPlusPlus && FnRetType->isRecordType() && 18495077c3876beeaed32280af88244e8050078619a8Douglas Gregor !CurContext->isDependentContext()) 18505077c3876beeaed32280af88244e8050078619a8Douglas Gregor FunctionScopes.back()->Returns.push_back(Result); 1851dfbb02a16ac8c764b5ba1742450513d6212d2f9fNAKAMURA Takumi 18525077c3876beeaed32280af88244e8050078619a8Douglas Gregor return Owned(Result); 18534eb206bebcdab28ababe8df55c6185cec2cdc071Steve Naroff} 18545f016e2cb5d11daeb237544de1c5d59f20fe1a6eReid Spencer 185560d7b3a319d84d688752be3870615ac0f111fb16John McCallStmtResult 18569ae2f076ca5ab1feb3ba95629099ec2319833701John McCallSema::ActOnReturnStmt(SourceLocation ReturnLoc, Expr *RetValExp) { 1857fc92137eee708b632c00a9b0934ff87aeae234a5Douglas Gregor // Check for unexpanded parameter packs. 1858fc92137eee708b632c00a9b0934ff87aeae234a5Douglas Gregor if (RetValExp && DiagnoseUnexpandedParameterPack(RetValExp)) 1859fc92137eee708b632c00a9b0934ff87aeae234a5Douglas Gregor return StmtError(); 1860fc92137eee708b632c00a9b0934ff87aeae234a5Douglas Gregor 18619ea9bdbc14374f7bacdb50d3e52c664ff12150ffDouglas Gregor if (getCurBlock()) 18624eb206bebcdab28ababe8df55c6185cec2cdc071Steve Naroff return ActOnBlockReturnStmt(ReturnLoc, RetValExp); 18634cffe2fd5c23168bc08f0453c684cbd3f79471d3Sebastian Redl 1864371f258e61e1365b951b17931a3c5ac1530fd1a0Chris Lattner QualType FnRetType; 1865926df6cfabf3eaa4afc990c097fa4619b76a9b57Douglas Gregor QualType DeclaredRetType; 1866f7c41dab1a8de29b0991e853b8822bb0d1ddc01cMike Stump if (const FunctionDecl *FD = getCurFunctionDecl()) { 1867371f258e61e1365b951b17931a3c5ac1530fd1a0Chris Lattner FnRetType = FD->getResultType(); 1868926df6cfabf3eaa4afc990c097fa4619b76a9b57Douglas Gregor DeclaredRetType = FnRetType; 186904a67a6aa3dfdc92d57f7f8d93ba397348c868a4John McCall if (FD->hasAttr<NoReturnAttr>() || 187004a67a6aa3dfdc92d57f7f8d93ba397348c868a4John McCall FD->getType()->getAs<FunctionType>()->getNoReturnAttr()) 18718662587fa75d3fb04f873e265841c9314c7f5523Chris Lattner Diag(ReturnLoc, diag::warn_noreturn_function_has_return_expr) 1872f7c41dab1a8de29b0991e853b8822bb0d1ddc01cMike Stump << getCurFunctionOrMethodDecl()->getDeclName(); 1873926df6cfabf3eaa4afc990c097fa4619b76a9b57Douglas Gregor } else if (ObjCMethodDecl *MD = getCurMethodDecl()) { 1874926df6cfabf3eaa4afc990c097fa4619b76a9b57Douglas Gregor DeclaredRetType = MD->getResultType(); 1875926df6cfabf3eaa4afc990c097fa4619b76a9b57Douglas Gregor if (MD->hasRelatedResultType() && MD->getClassInterface()) { 1876926df6cfabf3eaa4afc990c097fa4619b76a9b57Douglas Gregor // In the implementation of a method with a related return type, the 1877926df6cfabf3eaa4afc990c097fa4619b76a9b57Douglas Gregor // type used to type-check the validity of return statements within the 1878926df6cfabf3eaa4afc990c097fa4619b76a9b57Douglas Gregor // method body is a pointer to the type of the class being implemented. 1879926df6cfabf3eaa4afc990c097fa4619b76a9b57Douglas Gregor FnRetType = Context.getObjCInterfaceType(MD->getClassInterface()); 1880926df6cfabf3eaa4afc990c097fa4619b76a9b57Douglas Gregor FnRetType = Context.getObjCObjectPointerType(FnRetType); 1881926df6cfabf3eaa4afc990c097fa4619b76a9b57Douglas Gregor } else { 1882926df6cfabf3eaa4afc990c097fa4619b76a9b57Douglas Gregor FnRetType = DeclaredRetType; 1883926df6cfabf3eaa4afc990c097fa4619b76a9b57Douglas Gregor } 1884926df6cfabf3eaa4afc990c097fa4619b76a9b57Douglas Gregor } else // If we don't have a function/method context, bail. 1885c97fb9a394ce2cc5e664fcb472e93553528378adSteve Naroff return StmtError(); 18861eb4433ac451dc16f4133a88af2d002ac26c58efMike Stump 18875077c3876beeaed32280af88244e8050078619a8Douglas Gregor ReturnStmt *Result = 0; 18885cf216b7fa64b933b60743b0b26053e8e7aa87beChris Lattner if (FnRetType->isVoidType()) { 18898d7946151cd15c0e7c34250c122d59b2f5027999Nick Lewycky if (RetValExp) { 18908d7946151cd15c0e7c34250c122d59b2f5027999Nick Lewycky if (!RetValExp->isTypeDependent()) { 18918d7946151cd15c0e7c34250c122d59b2f5027999Nick Lewycky // C99 6.8.6.4p1 (ext_ since GCC warns) 18928d7946151cd15c0e7c34250c122d59b2f5027999Nick Lewycky unsigned D = diag::ext_return_has_expr; 18938d7946151cd15c0e7c34250c122d59b2f5027999Nick Lewycky if (RetValExp->getType()->isVoidType()) 18948d7946151cd15c0e7c34250c122d59b2f5027999Nick Lewycky D = diag::ext_return_has_void_expr; 18958d7946151cd15c0e7c34250c122d59b2f5027999Nick Lewycky else { 18968d7946151cd15c0e7c34250c122d59b2f5027999Nick Lewycky ExprResult Result = Owned(RetValExp); 18978d7946151cd15c0e7c34250c122d59b2f5027999Nick Lewycky Result = IgnoredValueConversions(Result.take()); 18988d7946151cd15c0e7c34250c122d59b2f5027999Nick Lewycky if (Result.isInvalid()) 18998d7946151cd15c0e7c34250c122d59b2f5027999Nick Lewycky return StmtError(); 19008d7946151cd15c0e7c34250c122d59b2f5027999Nick Lewycky RetValExp = Result.take(); 19018d7946151cd15c0e7c34250c122d59b2f5027999Nick Lewycky RetValExp = ImpCastExprToType(RetValExp, 19028d7946151cd15c0e7c34250c122d59b2f5027999Nick Lewycky Context.VoidTy, CK_ToVoid).take(); 19038d7946151cd15c0e7c34250c122d59b2f5027999Nick Lewycky } 19044cffe2fd5c23168bc08f0453c684cbd3f79471d3Sebastian Redl 19058d7946151cd15c0e7c34250c122d59b2f5027999Nick Lewycky // return (some void expression); is legal in C++. 19068d7946151cd15c0e7c34250c122d59b2f5027999Nick Lewycky if (D != diag::ext_return_has_void_expr || 19078d7946151cd15c0e7c34250c122d59b2f5027999Nick Lewycky !getLangOptions().CPlusPlus) { 19088d7946151cd15c0e7c34250c122d59b2f5027999Nick Lewycky NamedDecl *CurDecl = getCurFunctionOrMethodDecl(); 1909ca0d0d4a0d6ecd256d4bf8c1a0dc183a83119833Chandler Carruth 1910ca0d0d4a0d6ecd256d4bf8c1a0dc183a83119833Chandler Carruth int FunctionKind = 0; 1911ca0d0d4a0d6ecd256d4bf8c1a0dc183a83119833Chandler Carruth if (isa<ObjCMethodDecl>(CurDecl)) 1912ca0d0d4a0d6ecd256d4bf8c1a0dc183a83119833Chandler Carruth FunctionKind = 1; 1913ca0d0d4a0d6ecd256d4bf8c1a0dc183a83119833Chandler Carruth else if (isa<CXXConstructorDecl>(CurDecl)) 1914ca0d0d4a0d6ecd256d4bf8c1a0dc183a83119833Chandler Carruth FunctionKind = 2; 1915ca0d0d4a0d6ecd256d4bf8c1a0dc183a83119833Chandler Carruth else if (isa<CXXDestructorDecl>(CurDecl)) 1916ca0d0d4a0d6ecd256d4bf8c1a0dc183a83119833Chandler Carruth FunctionKind = 3; 1917ca0d0d4a0d6ecd256d4bf8c1a0dc183a83119833Chandler Carruth 19188d7946151cd15c0e7c34250c122d59b2f5027999Nick Lewycky Diag(ReturnLoc, D) 1919ca0d0d4a0d6ecd256d4bf8c1a0dc183a83119833Chandler Carruth << CurDecl->getDeclName() << FunctionKind 19208d7946151cd15c0e7c34250c122d59b2f5027999Nick Lewycky << RetValExp->getSourceRange(); 19218d7946151cd15c0e7c34250c122d59b2f5027999Nick Lewycky } 1922e878eb035b343d7d819c092102364ec9849716aeChris Lattner } 19231eb4433ac451dc16f4133a88af2d002ac26c58efMike Stump 1924b4eb64d8426c0eaa58d398961e0e74ff85063d7cJohn McCall CheckImplicitConversions(RetValExp, ReturnLoc); 19254765fa05b5652fcc4356371c2f481d0ea9a1b007John McCall RetValExp = MaybeCreateExprWithCleanups(RetValExp); 19265f016e2cb5d11daeb237544de1c5d59f20fe1a6eReid Spencer } 1927dfbb02a16ac8c764b5ba1742450513d6212d2f9fNAKAMURA Takumi 19285077c3876beeaed32280af88244e8050078619a8Douglas Gregor Result = new (Context) ReturnStmt(ReturnLoc, RetValExp, 0); 19295077c3876beeaed32280af88244e8050078619a8Douglas Gregor } else if (!RetValExp && !FnRetType->isDependentType()) { 19303c73c41cefcfe76f36b7bed72c9f1ec195490951Chris Lattner unsigned DiagID = diag::warn_return_missing_expr; // C90 6.6.6.4p4 19313c73c41cefcfe76f36b7bed72c9f1ec195490951Chris Lattner // C99 6.8.6.4p1 (ext_ since GCC warns) 19323c73c41cefcfe76f36b7bed72c9f1ec195490951Chris Lattner if (getLangOptions().C99) DiagID = diag::ext_return_missing_expr; 19333c73c41cefcfe76f36b7bed72c9f1ec195490951Chris Lattner 19343c73c41cefcfe76f36b7bed72c9f1ec195490951Chris Lattner if (FunctionDecl *FD = getCurFunctionDecl()) 193508631c5fa053867146b5ee8be658c229f6bf127cChris Lattner Diag(ReturnLoc, DiagID) << FD->getIdentifier() << 0/*fn*/; 19363c73c41cefcfe76f36b7bed72c9f1ec195490951Chris Lattner else 193708631c5fa053867146b5ee8be658c229f6bf127cChris Lattner Diag(ReturnLoc, DiagID) << getCurMethodDecl()->getDeclName() << 1/*meth*/; 19385077c3876beeaed32280af88244e8050078619a8Douglas Gregor Result = new (Context) ReturnStmt(ReturnLoc); 19395077c3876beeaed32280af88244e8050078619a8Douglas Gregor } else { 19405077c3876beeaed32280af88244e8050078619a8Douglas Gregor const VarDecl *NRVOCandidate = 0; 19415077c3876beeaed32280af88244e8050078619a8Douglas Gregor if (!FnRetType->isDependentType() && !RetValExp->isTypeDependent()) { 19425077c3876beeaed32280af88244e8050078619a8Douglas Gregor // we have a non-void function with an expression, continue checking 19435077c3876beeaed32280af88244e8050078619a8Douglas Gregor 19445077c3876beeaed32280af88244e8050078619a8Douglas Gregor // C99 6.8.6.4p3(136): The return statement is not an assignment. The 19455077c3876beeaed32280af88244e8050078619a8Douglas Gregor // overlap restriction of subclause 6.5.16.1 does not apply to the case of 19465077c3876beeaed32280af88244e8050078619a8Douglas Gregor // function return. 19475077c3876beeaed32280af88244e8050078619a8Douglas Gregor 1948856d3798af7c2f7251e4a295f3da7a09ce4c62abJohn McCall // In C++ the return statement is handled via a copy initialization, 19495077c3876beeaed32280af88244e8050078619a8Douglas Gregor // the C version of which boils down to CheckSingleAssignmentConstraints. 1950f5d8f466c3eebaffc51468812bdcbe7f0fe4891aDouglas Gregor NRVOCandidate = getCopyElisionCandidate(FnRetType, RetValExp, false); 1951dfbb02a16ac8c764b5ba1742450513d6212d2f9fNAKAMURA Takumi InitializedEntity Entity = InitializedEntity::InitializeResult(ReturnLoc, 195207f402cff25354c5f06f307f19b0c57c09d964bdDouglas Gregor FnRetType, 195358f14c012e5d739b09532bb12645dc161f88cfcfFrancois Pichet NRVOCandidate != 0); 1954dfbb02a16ac8c764b5ba1742450513d6212d2f9fNAKAMURA Takumi ExprResult Res = PerformMoveOrCopyInitialization(Entity, NRVOCandidate, 195507f402cff25354c5f06f307f19b0c57c09d964bdDouglas Gregor FnRetType, RetValExp); 19565077c3876beeaed32280af88244e8050078619a8Douglas Gregor if (Res.isInvalid()) { 19575077c3876beeaed32280af88244e8050078619a8Douglas Gregor // FIXME: Cleanup temporaries here, anyway? 19585077c3876beeaed32280af88244e8050078619a8Douglas Gregor return StmtError(); 19595077c3876beeaed32280af88244e8050078619a8Douglas Gregor } 19604cffe2fd5c23168bc08f0453c684cbd3f79471d3Sebastian Redl 19615077c3876beeaed32280af88244e8050078619a8Douglas Gregor RetValExp = Res.takeAs<Expr>(); 1962dfbb02a16ac8c764b5ba1742450513d6212d2f9fNAKAMURA Takumi if (RetValExp) 19635077c3876beeaed32280af88244e8050078619a8Douglas Gregor CheckReturnStackAddr(RetValExp, FnRetType, ReturnLoc); 196466724ea67d7d598b937d86fa66f03f09a1c758f3Douglas Gregor } 1965dfbb02a16ac8c764b5ba1742450513d6212d2f9fNAKAMURA Takumi 1966b4eb64d8426c0eaa58d398961e0e74ff85063d7cJohn McCall if (RetValExp) { 1967926df6cfabf3eaa4afc990c097fa4619b76a9b57Douglas Gregor // If we type-checked an Objective-C method's return type based 1968926df6cfabf3eaa4afc990c097fa4619b76a9b57Douglas Gregor // on a related return type, we may need to adjust the return 1969926df6cfabf3eaa4afc990c097fa4619b76a9b57Douglas Gregor // type again. Do so now. 1970926df6cfabf3eaa4afc990c097fa4619b76a9b57Douglas Gregor if (DeclaredRetType != FnRetType) { 1971926df6cfabf3eaa4afc990c097fa4619b76a9b57Douglas Gregor ExprResult result = PerformImplicitConversion(RetValExp, 1972926df6cfabf3eaa4afc990c097fa4619b76a9b57Douglas Gregor DeclaredRetType, 1973926df6cfabf3eaa4afc990c097fa4619b76a9b57Douglas Gregor AA_Returning); 1974926df6cfabf3eaa4afc990c097fa4619b76a9b57Douglas Gregor if (result.isInvalid()) return StmtError(); 1975926df6cfabf3eaa4afc990c097fa4619b76a9b57Douglas Gregor RetValExp = result.take(); 1976926df6cfabf3eaa4afc990c097fa4619b76a9b57Douglas Gregor } 1977926df6cfabf3eaa4afc990c097fa4619b76a9b57Douglas Gregor 1978b4eb64d8426c0eaa58d398961e0e74ff85063d7cJohn McCall CheckImplicitConversions(RetValExp, ReturnLoc); 19794765fa05b5652fcc4356371c2f481d0ea9a1b007John McCall RetValExp = MaybeCreateExprWithCleanups(RetValExp); 1980b4eb64d8426c0eaa58d398961e0e74ff85063d7cJohn McCall } 19815077c3876beeaed32280af88244e8050078619a8Douglas Gregor Result = new (Context) ReturnStmt(ReturnLoc, RetValExp, NRVOCandidate); 1982898574e7496ba8fd76290079d3a9d06954992734Douglas Gregor } 1983dfbb02a16ac8c764b5ba1742450513d6212d2f9fNAKAMURA Takumi 1984dfbb02a16ac8c764b5ba1742450513d6212d2f9fNAKAMURA Takumi // If we need to check for the named return value optimization, save the 19855077c3876beeaed32280af88244e8050078619a8Douglas Gregor // return statement in our scope for later processing. 19865077c3876beeaed32280af88244e8050078619a8Douglas Gregor if (getLangOptions().CPlusPlus && FnRetType->isRecordType() && 19875077c3876beeaed32280af88244e8050078619a8Douglas Gregor !CurContext->isDependentContext()) 19885077c3876beeaed32280af88244e8050078619a8Douglas Gregor FunctionScopes.back()->Returns.push_back(Result); 1989f85e193739c953358c865005855253af4f68a497John McCall 19905077c3876beeaed32280af88244e8050078619a8Douglas Gregor return Owned(Result); 19915f016e2cb5d11daeb237544de1c5d59f20fe1a6eReid Spencer} 19925f016e2cb5d11daeb237544de1c5d59f20fe1a6eReid Spencer 1993810f6d5d6223adaab0ccf0139f40de6484ad1bb5Chris Lattner/// CheckAsmLValue - GNU C has an extremely ugly extension whereby they silently 1994810f6d5d6223adaab0ccf0139f40de6484ad1bb5Chris Lattner/// ignore "noop" casts in places where an lvalue is required by an inline asm. 1995810f6d5d6223adaab0ccf0139f40de6484ad1bb5Chris Lattner/// We emulate this behavior when -fheinous-gnu-extensions is specified, but 1996810f6d5d6223adaab0ccf0139f40de6484ad1bb5Chris Lattner/// provide a strong guidance to not use it. 1997810f6d5d6223adaab0ccf0139f40de6484ad1bb5Chris Lattner/// 1998810f6d5d6223adaab0ccf0139f40de6484ad1bb5Chris Lattner/// This method checks to see if the argument is an acceptable l-value and 1999810f6d5d6223adaab0ccf0139f40de6484ad1bb5Chris Lattner/// returns false if it is a case we can handle. 2000810f6d5d6223adaab0ccf0139f40de6484ad1bb5Chris Lattnerstatic bool CheckAsmLValue(const Expr *E, Sema &S) { 2001703e39486689d6660e75f6b6de0068db031a51c7Anders Carlsson // Type dependent expressions will be checked during instantiation. 2002703e39486689d6660e75f6b6de0068db031a51c7Anders Carlsson if (E->isTypeDependent()) 2003703e39486689d6660e75f6b6de0068db031a51c7Anders Carlsson return false; 2004dfbb02a16ac8c764b5ba1742450513d6212d2f9fNAKAMURA Takumi 20057eb0a9eb0cde8444b97f9c5b713d9be7a6f1e607John McCall if (E->isLValue()) 2006810f6d5d6223adaab0ccf0139f40de6484ad1bb5Chris Lattner return false; // Cool, this is an lvalue. 2007810f6d5d6223adaab0ccf0139f40de6484ad1bb5Chris Lattner 2008810f6d5d6223adaab0ccf0139f40de6484ad1bb5Chris Lattner // Okay, this is not an lvalue, but perhaps it is the result of a cast that we 2009810f6d5d6223adaab0ccf0139f40de6484ad1bb5Chris Lattner // are supposed to allow. 2010810f6d5d6223adaab0ccf0139f40de6484ad1bb5Chris Lattner const Expr *E2 = E->IgnoreParenNoopCasts(S.Context); 20117eb0a9eb0cde8444b97f9c5b713d9be7a6f1e607John McCall if (E != E2 && E2->isLValue()) { 2012810f6d5d6223adaab0ccf0139f40de6484ad1bb5Chris Lattner if (!S.getLangOptions().HeinousExtensions) 2013810f6d5d6223adaab0ccf0139f40de6484ad1bb5Chris Lattner S.Diag(E2->getLocStart(), diag::err_invalid_asm_cast_lvalue) 2014810f6d5d6223adaab0ccf0139f40de6484ad1bb5Chris Lattner << E->getSourceRange(); 2015810f6d5d6223adaab0ccf0139f40de6484ad1bb5Chris Lattner else 2016810f6d5d6223adaab0ccf0139f40de6484ad1bb5Chris Lattner S.Diag(E2->getLocStart(), diag::warn_invalid_asm_cast_lvalue) 2017810f6d5d6223adaab0ccf0139f40de6484ad1bb5Chris Lattner << E->getSourceRange(); 2018810f6d5d6223adaab0ccf0139f40de6484ad1bb5Chris Lattner // Accept, even if we emitted an error diagnostic. 2019810f6d5d6223adaab0ccf0139f40de6484ad1bb5Chris Lattner return false; 2020810f6d5d6223adaab0ccf0139f40de6484ad1bb5Chris Lattner } 2021810f6d5d6223adaab0ccf0139f40de6484ad1bb5Chris Lattner 2022810f6d5d6223adaab0ccf0139f40de6484ad1bb5Chris Lattner // None of the above, just randomly invalid non-lvalue. 2023810f6d5d6223adaab0ccf0139f40de6484ad1bb5Chris Lattner return true; 2024810f6d5d6223adaab0ccf0139f40de6484ad1bb5Chris Lattner} 2025810f6d5d6223adaab0ccf0139f40de6484ad1bb5Chris Lattner 2026ca57b4b7658a031b74cda5ac504311998be8e343Chris Lattner/// isOperandMentioned - Return true if the specified operand # is mentioned 2027ca57b4b7658a031b74cda5ac504311998be8e343Chris Lattner/// anywhere in the decomposed asm string. 2028ca57b4b7658a031b74cda5ac504311998be8e343Chris Lattnerstatic bool isOperandMentioned(unsigned OpNo, 20292d3ba4f5a923a90c3fc290ddfba5e36c2d0a9b46Chris Lattner ArrayRef<AsmStmt::AsmStringPiece> AsmStrPieces) { 2030ca57b4b7658a031b74cda5ac504311998be8e343Chris Lattner for (unsigned p = 0, e = AsmStrPieces.size(); p != e; ++p) { 2031ca57b4b7658a031b74cda5ac504311998be8e343Chris Lattner const AsmStmt::AsmStringPiece &Piece = AsmStrPieces[p]; 2032ca57b4b7658a031b74cda5ac504311998be8e343Chris Lattner if (!Piece.isOperand()) continue; 2033ca57b4b7658a031b74cda5ac504311998be8e343Chris Lattner 2034ca57b4b7658a031b74cda5ac504311998be8e343Chris Lattner // If this is a reference to the input and if the input was the smaller 2035ca57b4b7658a031b74cda5ac504311998be8e343Chris Lattner // one, then we have to reject this asm. 2036ca57b4b7658a031b74cda5ac504311998be8e343Chris Lattner if (Piece.getOperandNo() == OpNo) 2037ca57b4b7658a031b74cda5ac504311998be8e343Chris Lattner return true; 2038ca57b4b7658a031b74cda5ac504311998be8e343Chris Lattner } 2039ca57b4b7658a031b74cda5ac504311998be8e343Chris Lattner 2040ca57b4b7658a031b74cda5ac504311998be8e343Chris Lattner return false; 2041ca57b4b7658a031b74cda5ac504311998be8e343Chris Lattner} 2042810f6d5d6223adaab0ccf0139f40de6484ad1bb5Chris Lattner 2043ca57b4b7658a031b74cda5ac504311998be8e343Chris LattnerStmtResult Sema::ActOnAsmStmt(SourceLocation AsmLoc, bool IsSimple, 2044ca57b4b7658a031b74cda5ac504311998be8e343Chris Lattner bool IsVolatile, unsigned NumOutputs, 2045ca57b4b7658a031b74cda5ac504311998be8e343Chris Lattner unsigned NumInputs, IdentifierInfo **Names, 2046ca57b4b7658a031b74cda5ac504311998be8e343Chris Lattner MultiExprArg constraints, MultiExprArg exprs, 2047ca57b4b7658a031b74cda5ac504311998be8e343Chris Lattner Expr *asmString, MultiExprArg clobbers, 2048ca57b4b7658a031b74cda5ac504311998be8e343Chris Lattner SourceLocation RParenLoc, bool MSAsm) { 20493037ed0a27dba62e522304183718efc149e8b6d9Sebastian Redl unsigned NumClobbers = clobbers.size(); 20503037ed0a27dba62e522304183718efc149e8b6d9Sebastian Redl StringLiteral **Constraints = 20513037ed0a27dba62e522304183718efc149e8b6d9Sebastian Redl reinterpret_cast<StringLiteral**>(constraints.get()); 20529ae2f076ca5ab1feb3ba95629099ec2319833701John McCall Expr **Exprs = exprs.get(); 20539ae2f076ca5ab1feb3ba95629099ec2319833701John McCall StringLiteral *AsmString = cast<StringLiteral>(asmString); 20543037ed0a27dba62e522304183718efc149e8b6d9Sebastian Redl StringLiteral **Clobbers = reinterpret_cast<StringLiteral**>(clobbers.get()); 20553037ed0a27dba62e522304183718efc149e8b6d9Sebastian Redl 20565f9e272e632e951b1efe824cd16acb4d96077930Chris Lattner SmallVector<TargetInfo::ConstraintInfo, 4> OutputConstraintInfos; 20571eb4433ac451dc16f4133a88af2d002ac26c58efMike Stump 20581708b963a014b48103e78131f960a13ee1aa6d0cChris Lattner // The parser verifies that there is a string literal here. 20595cee1195584fa8672253139c86e922daeda69b9eDouglas Gregor if (!AsmString->isAscii()) 20603037ed0a27dba62e522304183718efc149e8b6d9Sebastian Redl return StmtError(Diag(AsmString->getLocStart(),diag::err_asm_wide_character) 20613037ed0a27dba62e522304183718efc149e8b6d9Sebastian Redl << AsmString->getSourceRange()); 20623037ed0a27dba62e522304183718efc149e8b6d9Sebastian Redl 20631708b963a014b48103e78131f960a13ee1aa6d0cChris Lattner for (unsigned i = 0; i != NumOutputs; i++) { 20641708b963a014b48103e78131f960a13ee1aa6d0cChris Lattner StringLiteral *Literal = Constraints[i]; 20655cee1195584fa8672253139c86e922daeda69b9eDouglas Gregor if (!Literal->isAscii()) 20663037ed0a27dba62e522304183718efc149e8b6d9Sebastian Redl return StmtError(Diag(Literal->getLocStart(),diag::err_asm_wide_character) 20673037ed0a27dba62e522304183718efc149e8b6d9Sebastian Redl << Literal->getSourceRange()); 20683037ed0a27dba62e522304183718efc149e8b6d9Sebastian Redl 20695f9e272e632e951b1efe824cd16acb4d96077930Chris Lattner StringRef OutputName; 2070ff93dbd887e40588ed55d135037bb9287488b285Anders Carlsson if (Names[i]) 2071ff93dbd887e40588ed55d135037bb9287488b285Anders Carlsson OutputName = Names[i]->getName(); 2072ff93dbd887e40588ed55d135037bb9287488b285Anders Carlsson 2073ff93dbd887e40588ed55d135037bb9287488b285Anders Carlsson TargetInfo::ConstraintInfo Info(Literal->getString(), OutputName); 2074432c86969eced2ce658b3f3f2aa7407c8864f21bChris Lattner if (!Context.Target.validateOutputConstraint(Info)) 20753037ed0a27dba62e522304183718efc149e8b6d9Sebastian Redl return StmtError(Diag(Literal->getLocStart(), 2076432c86969eced2ce658b3f3f2aa7407c8864f21bChris Lattner diag::err_asm_invalid_output_constraint) 2077432c86969eced2ce658b3f3f2aa7407c8864f21bChris Lattner << Info.getConstraintStr()); 20783037ed0a27dba62e522304183718efc149e8b6d9Sebastian Redl 2079d04c6e23f2e10eeb9936778d67f4a1c4a14cc4f6Anders Carlsson // Check that the output exprs are valid lvalues. 208072056a237c536ee63285ab0850cb50f299281767Eli Friedman Expr *OutputExpr = Exprs[i]; 2081810f6d5d6223adaab0ccf0139f40de6484ad1bb5Chris Lattner if (CheckAsmLValue(OutputExpr, *this)) { 208272056a237c536ee63285ab0850cb50f299281767Eli Friedman return StmtError(Diag(OutputExpr->getLocStart(), 2083dcd5ef12488e4c7ea844327835896ca86b609a97Chris Lattner diag::err_asm_invalid_lvalue_in_output) 208472056a237c536ee63285ab0850cb50f299281767Eli Friedman << OutputExpr->getSourceRange()); 208504728b7ea928b029f165fc67d32ced40e6868b31Anders Carlsson } 20861eb4433ac451dc16f4133a88af2d002ac26c58efMike Stump 208744def070435a2b5d67f0534f7a3a85a7389d60f2Chris Lattner OutputConstraintInfos.push_back(Info); 208804728b7ea928b029f165fc67d32ced40e6868b31Anders Carlsson } 20893037ed0a27dba62e522304183718efc149e8b6d9Sebastian Redl 20905f9e272e632e951b1efe824cd16acb4d96077930Chris Lattner SmallVector<TargetInfo::ConstraintInfo, 4> InputConstraintInfos; 2091806503f8c839d7f5ebf3fbf7ee848c179be76dd2Chris Lattner 209204728b7ea928b029f165fc67d32ced40e6868b31Anders Carlsson for (unsigned i = NumOutputs, e = NumOutputs + NumInputs; i != e; i++) { 20931708b963a014b48103e78131f960a13ee1aa6d0cChris Lattner StringLiteral *Literal = Constraints[i]; 20945cee1195584fa8672253139c86e922daeda69b9eDouglas Gregor if (!Literal->isAscii()) 20953037ed0a27dba62e522304183718efc149e8b6d9Sebastian Redl return StmtError(Diag(Literal->getLocStart(),diag::err_asm_wide_character) 20963037ed0a27dba62e522304183718efc149e8b6d9Sebastian Redl << Literal->getSourceRange()); 20973037ed0a27dba62e522304183718efc149e8b6d9Sebastian Redl 20985f9e272e632e951b1efe824cd16acb4d96077930Chris Lattner StringRef InputName; 2099ff93dbd887e40588ed55d135037bb9287488b285Anders Carlsson if (Names[i]) 2100ff93dbd887e40588ed55d135037bb9287488b285Anders Carlsson InputName = Names[i]->getName(); 2101ff93dbd887e40588ed55d135037bb9287488b285Anders Carlsson 2102ff93dbd887e40588ed55d135037bb9287488b285Anders Carlsson TargetInfo::ConstraintInfo Info(Literal->getString(), InputName); 2103beaaccd8e2a8748f77b66e2b330fb9136937e14cJay Foad if (!Context.Target.validateInputConstraint(OutputConstraintInfos.data(), 21042819fa85651526d59ade4fdc9da2cadd7b132973Chris Lattner NumOutputs, Info)) { 21053037ed0a27dba62e522304183718efc149e8b6d9Sebastian Redl return StmtError(Diag(Literal->getLocStart(), 2106432c86969eced2ce658b3f3f2aa7407c8864f21bChris Lattner diag::err_asm_invalid_input_constraint) 2107432c86969eced2ce658b3f3f2aa7407c8864f21bChris Lattner << Info.getConstraintStr()); 2108d04c6e23f2e10eeb9936778d67f4a1c4a14cc4f6Anders Carlsson } 21093037ed0a27dba62e522304183718efc149e8b6d9Sebastian Redl 211072056a237c536ee63285ab0850cb50f299281767Eli Friedman Expr *InputExpr = Exprs[i]; 21113037ed0a27dba62e522304183718efc149e8b6d9Sebastian Redl 2112d9fca6e3950346ea503f92f27ed0f9d8edde9febAnders Carlsson // Only allow void types for memory constraints. 211344def070435a2b5d67f0534f7a3a85a7389d60f2Chris Lattner if (Info.allowsMemory() && !Info.allowsRegister()) { 2114810f6d5d6223adaab0ccf0139f40de6484ad1bb5Chris Lattner if (CheckAsmLValue(InputExpr, *this)) 211572056a237c536ee63285ab0850cb50f299281767Eli Friedman return StmtError(Diag(InputExpr->getLocStart(), 2116d9fca6e3950346ea503f92f27ed0f9d8edde9febAnders Carlsson diag::err_asm_invalid_lvalue_in_input) 2117432c86969eced2ce658b3f3f2aa7407c8864f21bChris Lattner << Info.getConstraintStr() 211872056a237c536ee63285ab0850cb50f299281767Eli Friedman << InputExpr->getSourceRange()); 211904728b7ea928b029f165fc67d32ced40e6868b31Anders Carlsson } 21203037ed0a27dba62e522304183718efc149e8b6d9Sebastian Redl 212144def070435a2b5d67f0534f7a3a85a7389d60f2Chris Lattner if (Info.allowsRegister()) { 2122d9fca6e3950346ea503f92f27ed0f9d8edde9febAnders Carlsson if (InputExpr->getType()->isVoidType()) { 212372056a237c536ee63285ab0850cb50f299281767Eli Friedman return StmtError(Diag(InputExpr->getLocStart(), 2124d9fca6e3950346ea503f92f27ed0f9d8edde9febAnders Carlsson diag::err_asm_invalid_type_in_input) 21251eb4433ac451dc16f4133a88af2d002ac26c58efMike Stump << InputExpr->getType() << Info.getConstraintStr() 212672056a237c536ee63285ab0850cb50f299281767Eli Friedman << InputExpr->getSourceRange()); 2127d9fca6e3950346ea503f92f27ed0f9d8edde9febAnders Carlsson } 2128d9fca6e3950346ea503f92f27ed0f9d8edde9febAnders Carlsson } 21291eb4433ac451dc16f4133a88af2d002ac26c58efMike Stump 2130429bb276991ff2dbc7c5b438828b9b7737cb15ebJohn Wiegley ExprResult Result = DefaultFunctionArrayLvalueConversion(Exprs[i]); 2131429bb276991ff2dbc7c5b438828b9b7737cb15ebJohn Wiegley if (Result.isInvalid()) 2132429bb276991ff2dbc7c5b438828b9b7737cb15ebJohn Wiegley return StmtError(); 21331eb4433ac451dc16f4133a88af2d002ac26c58efMike Stump 2134429bb276991ff2dbc7c5b438828b9b7737cb15ebJohn Wiegley Exprs[i] = Result.take(); 2135806503f8c839d7f5ebf3fbf7ee848c179be76dd2Chris Lattner InputConstraintInfos.push_back(Info); 213604728b7ea928b029f165fc67d32ced40e6868b31Anders Carlsson } 21373037ed0a27dba62e522304183718efc149e8b6d9Sebastian Redl 21386fa9086043b0338d895a4cdb0ec8542530af90d7Anders Carlsson // Check that the clobbers are valid. 21391708b963a014b48103e78131f960a13ee1aa6d0cChris Lattner for (unsigned i = 0; i != NumClobbers; i++) { 21401708b963a014b48103e78131f960a13ee1aa6d0cChris Lattner StringLiteral *Literal = Clobbers[i]; 21415cee1195584fa8672253139c86e922daeda69b9eDouglas Gregor if (!Literal->isAscii()) 21423037ed0a27dba62e522304183718efc149e8b6d9Sebastian Redl return StmtError(Diag(Literal->getLocStart(),diag::err_asm_wide_character) 21433037ed0a27dba62e522304183718efc149e8b6d9Sebastian Redl << Literal->getSourceRange()); 21443037ed0a27dba62e522304183718efc149e8b6d9Sebastian Redl 21455f9e272e632e951b1efe824cd16acb4d96077930Chris Lattner StringRef Clobber = Literal->getString(); 21463037ed0a27dba62e522304183718efc149e8b6d9Sebastian Redl 2147de31fd7eeebdc64fb043463e7f515dab8eccac8dEric Christopher if (!Context.Target.isValidClobber(Clobber)) 21483037ed0a27dba62e522304183718efc149e8b6d9Sebastian Redl return StmtError(Diag(Literal->getLocStart(), 21497765934ad7e157b5fcf925792a38e01b1edbcf8aDaniel Dunbar diag::err_asm_unknown_register_name) << Clobber); 21506fa9086043b0338d895a4cdb0ec8542530af90d7Anders Carlsson } 21513037ed0a27dba62e522304183718efc149e8b6d9Sebastian Redl 2152fb5058ef67c054296c88db18ab1b3717845cb71dChris Lattner AsmStmt *NS = 2153dfbb02a16ac8c764b5ba1742450513d6212d2f9fNAKAMURA Takumi new (Context) AsmStmt(Context, AsmLoc, IsSimple, IsVolatile, MSAsm, 2154dfbb02a16ac8c764b5ba1742450513d6212d2f9fNAKAMURA Takumi NumOutputs, NumInputs, Names, Constraints, Exprs, 2155966146e89141804ff6492739a2a6e6592ca671c7Anders Carlsson AsmString, NumClobbers, Clobbers, RParenLoc); 2156fb5058ef67c054296c88db18ab1b3717845cb71dChris Lattner // Validate the asm string, ensuring it makes sense given the operands we 2157fb5058ef67c054296c88db18ab1b3717845cb71dChris Lattner // have. 21585f9e272e632e951b1efe824cd16acb4d96077930Chris Lattner SmallVector<AsmStmt::AsmStringPiece, 8> Pieces; 2159fb5058ef67c054296c88db18ab1b3717845cb71dChris Lattner unsigned DiagOffs; 2160fb5058ef67c054296c88db18ab1b3717845cb71dChris Lattner if (unsigned DiagID = NS->AnalyzeAsmString(Pieces, Context, DiagOffs)) { 21612ff0f42a962fec5a6300b5986297b417db173e6aChris Lattner Diag(getLocationOfStringLiteralByte(AsmString, DiagOffs), DiagID) 21622ff0f42a962fec5a6300b5986297b417db173e6aChris Lattner << AsmString->getSourceRange(); 2163fb5058ef67c054296c88db18ab1b3717845cb71dChris Lattner return StmtError(); 2164fb5058ef67c054296c88db18ab1b3717845cb71dChris Lattner } 21651eb4433ac451dc16f4133a88af2d002ac26c58efMike Stump 2166806503f8c839d7f5ebf3fbf7ee848c179be76dd2Chris Lattner // Validate tied input operands for type mismatches. 2167806503f8c839d7f5ebf3fbf7ee848c179be76dd2Chris Lattner for (unsigned i = 0, e = InputConstraintInfos.size(); i != e; ++i) { 2168806503f8c839d7f5ebf3fbf7ee848c179be76dd2Chris Lattner TargetInfo::ConstraintInfo &Info = InputConstraintInfos[i]; 21691eb4433ac451dc16f4133a88af2d002ac26c58efMike Stump 2170806503f8c839d7f5ebf3fbf7ee848c179be76dd2Chris Lattner // If this is a tied constraint, verify that the output and input have 2171806503f8c839d7f5ebf3fbf7ee848c179be76dd2Chris Lattner // either exactly the same type, or that they are int/ptr operands with the 2172806503f8c839d7f5ebf3fbf7ee848c179be76dd2Chris Lattner // same size (int/long, int*/long, are ok etc). 2173806503f8c839d7f5ebf3fbf7ee848c179be76dd2Chris Lattner if (!Info.hasTiedOperand()) continue; 21741eb4433ac451dc16f4133a88af2d002ac26c58efMike Stump 2175806503f8c839d7f5ebf3fbf7ee848c179be76dd2Chris Lattner unsigned TiedTo = Info.getTiedOperand(); 2176935f0f01c1ed3c2052b797ac035d57a85b78adc4Chris Lattner unsigned InputOpNo = i+NumOutputs; 2177f69fcaeb3843297757251a19f0a6f5bbffed7f32Chris Lattner Expr *OutputExpr = Exprs[TiedTo]; 2178935f0f01c1ed3c2052b797ac035d57a85b78adc4Chris Lattner Expr *InputExpr = Exprs[InputOpNo]; 21797adaa18ef3be65971cd41cc61dd739baeb02af10Chris Lattner QualType InTy = InputExpr->getType(); 21807adaa18ef3be65971cd41cc61dd739baeb02af10Chris Lattner QualType OutTy = OutputExpr->getType(); 21817adaa18ef3be65971cd41cc61dd739baeb02af10Chris Lattner if (Context.hasSameType(InTy, OutTy)) 2182806503f8c839d7f5ebf3fbf7ee848c179be76dd2Chris Lattner continue; // All types can be tied to themselves. 21831eb4433ac451dc16f4133a88af2d002ac26c58efMike Stump 2184aab64d0b7f41ed30b15ba9210ed859424cbc7455Chris Lattner // Decide if the input and output are in the same domain (integer/ptr or 2185aab64d0b7f41ed30b15ba9210ed859424cbc7455Chris Lattner // floating point. 2186aab64d0b7f41ed30b15ba9210ed859424cbc7455Chris Lattner enum AsmDomain { 2187aab64d0b7f41ed30b15ba9210ed859424cbc7455Chris Lattner AD_Int, AD_FP, AD_Other 2188aab64d0b7f41ed30b15ba9210ed859424cbc7455Chris Lattner } InputDomain, OutputDomain; 2189dfbb02a16ac8c764b5ba1742450513d6212d2f9fNAKAMURA Takumi 2190aab64d0b7f41ed30b15ba9210ed859424cbc7455Chris Lattner if (InTy->isIntegerType() || InTy->isPointerType()) 2191aab64d0b7f41ed30b15ba9210ed859424cbc7455Chris Lattner InputDomain = AD_Int; 21920c293ea13d452c1a47a05ada5a5ee9acc69c66ccDouglas Gregor else if (InTy->isRealFloatingType()) 2193aab64d0b7f41ed30b15ba9210ed859424cbc7455Chris Lattner InputDomain = AD_FP; 2194aab64d0b7f41ed30b15ba9210ed859424cbc7455Chris Lattner else 2195aab64d0b7f41ed30b15ba9210ed859424cbc7455Chris Lattner InputDomain = AD_Other; 21963351f1145aa91ddd8022fcd3ca16c219db9e8277Chris Lattner 2197aab64d0b7f41ed30b15ba9210ed859424cbc7455Chris Lattner if (OutTy->isIntegerType() || OutTy->isPointerType()) 2198aab64d0b7f41ed30b15ba9210ed859424cbc7455Chris Lattner OutputDomain = AD_Int; 21990c293ea13d452c1a47a05ada5a5ee9acc69c66ccDouglas Gregor else if (OutTy->isRealFloatingType()) 2200aab64d0b7f41ed30b15ba9210ed859424cbc7455Chris Lattner OutputDomain = AD_FP; 2201aab64d0b7f41ed30b15ba9210ed859424cbc7455Chris Lattner else 2202aab64d0b7f41ed30b15ba9210ed859424cbc7455Chris Lattner OutputDomain = AD_Other; 2203dfbb02a16ac8c764b5ba1742450513d6212d2f9fNAKAMURA Takumi 2204aab64d0b7f41ed30b15ba9210ed859424cbc7455Chris Lattner // They are ok if they are the same size and in the same domain. This 2205aab64d0b7f41ed30b15ba9210ed859424cbc7455Chris Lattner // allows tying things like: 2206aab64d0b7f41ed30b15ba9210ed859424cbc7455Chris Lattner // void* to int* 2207aab64d0b7f41ed30b15ba9210ed859424cbc7455Chris Lattner // void* to int if they are the same size. 2208aab64d0b7f41ed30b15ba9210ed859424cbc7455Chris Lattner // double to long double if they are the same size. 2209dfbb02a16ac8c764b5ba1742450513d6212d2f9fNAKAMURA Takumi // 2210aab64d0b7f41ed30b15ba9210ed859424cbc7455Chris Lattner uint64_t OutSize = Context.getTypeSize(OutTy); 2211aab64d0b7f41ed30b15ba9210ed859424cbc7455Chris Lattner uint64_t InSize = Context.getTypeSize(InTy); 2212aab64d0b7f41ed30b15ba9210ed859424cbc7455Chris Lattner if (OutSize == InSize && InputDomain == OutputDomain && 2213aab64d0b7f41ed30b15ba9210ed859424cbc7455Chris Lattner InputDomain != AD_Other) 2214aab64d0b7f41ed30b15ba9210ed859424cbc7455Chris Lattner continue; 2215dfbb02a16ac8c764b5ba1742450513d6212d2f9fNAKAMURA Takumi 2216aab64d0b7f41ed30b15ba9210ed859424cbc7455Chris Lattner // If the smaller input/output operand is not mentioned in the asm string, 2217f0c4d28020fb13fdbf7d6fccfab1b7b6a118ad0eChris Lattner // then we can promote the smaller one to a larger input and the asm string 2218f0c4d28020fb13fdbf7d6fccfab1b7b6a118ad0eChris Lattner // won't notice. 2219aab64d0b7f41ed30b15ba9210ed859424cbc7455Chris Lattner bool SmallerValueMentioned = false; 2220ca57b4b7658a031b74cda5ac504311998be8e343Chris Lattner 2221ca57b4b7658a031b74cda5ac504311998be8e343Chris Lattner // If this is a reference to the input and if the input was the smaller 2222ca57b4b7658a031b74cda5ac504311998be8e343Chris Lattner // one, then we have to reject this asm. 2223935f0f01c1ed3c2052b797ac035d57a85b78adc4Chris Lattner if (isOperandMentioned(InputOpNo, Pieces)) { 2224ca57b4b7658a031b74cda5ac504311998be8e343Chris Lattner // This is a use in the asm string of the smaller operand. Since we 2225ca57b4b7658a031b74cda5ac504311998be8e343Chris Lattner // codegen this by promoting to a wider value, the asm will get printed 2226ca57b4b7658a031b74cda5ac504311998be8e343Chris Lattner // "wrong". 2227f0c4d28020fb13fdbf7d6fccfab1b7b6a118ad0eChris Lattner SmallerValueMentioned |= InSize < OutSize; 2228ca57b4b7658a031b74cda5ac504311998be8e343Chris Lattner } 2229f0c4d28020fb13fdbf7d6fccfab1b7b6a118ad0eChris Lattner if (isOperandMentioned(TiedTo, Pieces)) { 2230ca57b4b7658a031b74cda5ac504311998be8e343Chris Lattner // If this is a reference to the output, and if the output is the larger 2231ca57b4b7658a031b74cda5ac504311998be8e343Chris Lattner // value, then it's ok because we'll promote the input to the larger type. 2232f0c4d28020fb13fdbf7d6fccfab1b7b6a118ad0eChris Lattner SmallerValueMentioned |= OutSize < InSize; 2233806503f8c839d7f5ebf3fbf7ee848c179be76dd2Chris Lattner } 22341eb4433ac451dc16f4133a88af2d002ac26c58efMike Stump 2235aab64d0b7f41ed30b15ba9210ed859424cbc7455Chris Lattner // If the smaller value wasn't mentioned in the asm string, and if the 2236aab64d0b7f41ed30b15ba9210ed859424cbc7455Chris Lattner // output was a register, just extend the shorter one to the size of the 2237aab64d0b7f41ed30b15ba9210ed859424cbc7455Chris Lattner // larger one. 2238aab64d0b7f41ed30b15ba9210ed859424cbc7455Chris Lattner if (!SmallerValueMentioned && InputDomain != AD_Other && 2239aab64d0b7f41ed30b15ba9210ed859424cbc7455Chris Lattner OutputConstraintInfos[TiedTo].allowsRegister()) 2240aab64d0b7f41ed30b15ba9210ed859424cbc7455Chris Lattner continue; 2241f0c4d28020fb13fdbf7d6fccfab1b7b6a118ad0eChris Lattner 2242935f0f01c1ed3c2052b797ac035d57a85b78adc4Chris Lattner // Either both of the operands were mentioned or the smaller one was 2243935f0f01c1ed3c2052b797ac035d57a85b78adc4Chris Lattner // mentioned. One more special case that we'll allow: if the tied input is 2244935f0f01c1ed3c2052b797ac035d57a85b78adc4Chris Lattner // integer, unmentioned, and is a constant, then we'll allow truncating it 2245935f0f01c1ed3c2052b797ac035d57a85b78adc4Chris Lattner // down to the size of the destination. 2246935f0f01c1ed3c2052b797ac035d57a85b78adc4Chris Lattner if (InputDomain == AD_Int && OutputDomain == AD_Int && 2247935f0f01c1ed3c2052b797ac035d57a85b78adc4Chris Lattner !isOperandMentioned(InputOpNo, Pieces) && 2248935f0f01c1ed3c2052b797ac035d57a85b78adc4Chris Lattner InputExpr->isEvaluatable(Context)) { 22494da89c87b2b6ca31f1015ec19aae65a02971ea9aJohn McCall CastKind castKind = 22504da89c87b2b6ca31f1015ec19aae65a02971ea9aJohn McCall (OutTy->isBooleanType() ? CK_IntegralToBoolean : CK_IntegralCast); 22514da89c87b2b6ca31f1015ec19aae65a02971ea9aJohn McCall InputExpr = ImpCastExprToType(InputExpr, OutTy, castKind).take(); 2252935f0f01c1ed3c2052b797ac035d57a85b78adc4Chris Lattner Exprs[InputOpNo] = InputExpr; 2253935f0f01c1ed3c2052b797ac035d57a85b78adc4Chris Lattner NS->setInputExpr(i, InputExpr); 2254935f0f01c1ed3c2052b797ac035d57a85b78adc4Chris Lattner continue; 2255935f0f01c1ed3c2052b797ac035d57a85b78adc4Chris Lattner } 2256935f0f01c1ed3c2052b797ac035d57a85b78adc4Chris Lattner 2257c1f3b28004a032f4cd13721d4d884c6dcec29c31Chris Lattner Diag(InputExpr->getLocStart(), 2258806503f8c839d7f5ebf3fbf7ee848c179be76dd2Chris Lattner diag::err_asm_tying_incompatible_types) 22597adaa18ef3be65971cd41cc61dd739baeb02af10Chris Lattner << InTy << OutTy << OutputExpr->getSourceRange() 2260806503f8c839d7f5ebf3fbf7ee848c179be76dd2Chris Lattner << InputExpr->getSourceRange(); 2261806503f8c839d7f5ebf3fbf7ee848c179be76dd2Chris Lattner return StmtError(); 2262806503f8c839d7f5ebf3fbf7ee848c179be76dd2Chris Lattner } 22631eb4433ac451dc16f4133a88af2d002ac26c58efMike Stump 2264fb5058ef67c054296c88db18ab1b3717845cb71dChris Lattner return Owned(NS); 2265fe795956194141c91ae555985c9b930595bff43fChris Lattner} 22663b1191d7eaf2f4984564e01ab84b6713a9d80e70Fariborz Jahanian 226760d7b3a319d84d688752be3870615ac0f111fb16John McCallStmtResult 2268431e90e887c21c0d0d56fc12a2d359df8d53ea66Sebastian RedlSema::ActOnObjCAtCatchStmt(SourceLocation AtLoc, 2269d226f65006733ed7f709c3174f22ce33391cb58fJohn McCall SourceLocation RParen, Decl *Parm, 22709ae2f076ca5ab1feb3ba95629099ec2319833701John McCall Stmt *Body) { 2271d226f65006733ed7f709c3174f22ce33391cb58fJohn McCall VarDecl *Var = cast_or_null<VarDecl>(Parm); 2272160b5630aa781ac348303e1ae088d27016637778Douglas Gregor if (Var && Var->isInvalidDecl()) 2273160b5630aa781ac348303e1ae088d27016637778Douglas Gregor return StmtError(); 2274dfbb02a16ac8c764b5ba1742450513d6212d2f9fNAKAMURA Takumi 22759ae2f076ca5ab1feb3ba95629099ec2319833701John McCall return Owned(new (Context) ObjCAtCatchStmt(AtLoc, RParen, Var, Body)); 22763b1191d7eaf2f4984564e01ab84b6713a9d80e70Fariborz Jahanian} 22773b1191d7eaf2f4984564e01ab84b6713a9d80e70Fariborz Jahanian 227860d7b3a319d84d688752be3870615ac0f111fb16John McCallStmtResult 22799ae2f076ca5ab1feb3ba95629099ec2319833701John McCallSema::ActOnObjCAtFinallyStmt(SourceLocation AtLoc, Stmt *Body) { 22809ae2f076ca5ab1feb3ba95629099ec2319833701John McCall return Owned(new (Context) ObjCAtFinallyStmt(AtLoc, Body)); 2281161a9c5afaafb4d527b7efba9675a8b2cbbe32e0Fariborz Jahanian} 2282bd49a647afd9cc534fef13cadf652d4e9c396e2bFariborz Jahanian 228360d7b3a319d84d688752be3870615ac0f111fb16John McCallStmtResult 2284dfbb02a16ac8c764b5ba1742450513d6212d2f9fNAKAMURA TakumiSema::ActOnObjCAtTryStmt(SourceLocation AtLoc, Stmt *Try, 22859ae2f076ca5ab1feb3ba95629099ec2319833701John McCall MultiStmtArg CatchStmts, Stmt *Finally) { 2286da4b7cf09ebfd4e4098b516081fa9dae2f5c99e0Anders Carlsson if (!getLangOptions().ObjCExceptions) 2287da4b7cf09ebfd4e4098b516081fa9dae2f5c99e0Anders Carlsson Diag(AtLoc, diag::err_objc_exceptions_disabled) << "@try"; 2288da4b7cf09ebfd4e4098b516081fa9dae2f5c99e0Anders Carlsson 2289781472fe99a120098c631b0cbe33c89f8cef5e70John McCall getCurFunction()->setHasBranchProtectedScope(); 22908f5e3dd32e443768d9dbbad7191e123e6733750cDouglas Gregor unsigned NumCatchStmts = CatchStmts.size(); 22919ae2f076ca5ab1feb3ba95629099ec2319833701John McCall return Owned(ObjCAtTryStmt::Create(Context, AtLoc, Try, 22929ae2f076ca5ab1feb3ba95629099ec2319833701John McCall CatchStmts.release(), 22938f5e3dd32e443768d9dbbad7191e123e6733750cDouglas Gregor NumCatchStmts, 22949ae2f076ca5ab1feb3ba95629099ec2319833701John McCall Finally)); 2295bd49a647afd9cc534fef13cadf652d4e9c396e2bFariborz Jahanian} 2296bd49a647afd9cc534fef13cadf652d4e9c396e2bFariborz Jahanian 229760d7b3a319d84d688752be3870615ac0f111fb16John McCallStmtResult Sema::BuildObjCAtThrowStmt(SourceLocation AtLoc, 22989ae2f076ca5ab1feb3ba95629099ec2319833701John McCall Expr *Throw) { 2299d1377b25a36adfe6604f78cbd3a23a07cf0f29e6Douglas Gregor if (Throw) { 2300f2dd68fb37a62571a4985c8dd05310ac90d07ef0Fariborz Jahanian Throw = MaybeCreateExprWithCleanups(Throw); 2301429bb276991ff2dbc7c5b438828b9b7737cb15ebJohn Wiegley ExprResult Result = DefaultLvalueConversion(Throw); 2302429bb276991ff2dbc7c5b438828b9b7737cb15ebJohn Wiegley if (Result.isInvalid()) 2303429bb276991ff2dbc7c5b438828b9b7737cb15ebJohn Wiegley return StmtError(); 23045e3c67b4bd894a926282d24b4d0cbc0e123c9f4aJohn McCall 2305429bb276991ff2dbc7c5b438828b9b7737cb15ebJohn Wiegley Throw = Result.take(); 2306d1377b25a36adfe6604f78cbd3a23a07cf0f29e6Douglas Gregor QualType ThrowType = Throw->getType(); 2307d1377b25a36adfe6604f78cbd3a23a07cf0f29e6Douglas Gregor // Make sure the expression type is an ObjC pointer or "void *". 2308d1377b25a36adfe6604f78cbd3a23a07cf0f29e6Douglas Gregor if (!ThrowType->isDependentType() && 2309d1377b25a36adfe6604f78cbd3a23a07cf0f29e6Douglas Gregor !ThrowType->isObjCObjectPointerType()) { 2310d1377b25a36adfe6604f78cbd3a23a07cf0f29e6Douglas Gregor const PointerType *PT = ThrowType->getAs<PointerType>(); 2311d1377b25a36adfe6604f78cbd3a23a07cf0f29e6Douglas Gregor if (!PT || !PT->getPointeeType()->isVoidType()) 2312d1377b25a36adfe6604f78cbd3a23a07cf0f29e6Douglas Gregor return StmtError(Diag(AtLoc, diag::error_objc_throw_expects_object) 2313d1377b25a36adfe6604f78cbd3a23a07cf0f29e6Douglas Gregor << Throw->getType() << Throw->getSourceRange()); 2314d1377b25a36adfe6604f78cbd3a23a07cf0f29e6Douglas Gregor } 2315d1377b25a36adfe6604f78cbd3a23a07cf0f29e6Douglas Gregor } 2316dfbb02a16ac8c764b5ba1742450513d6212d2f9fNAKAMURA Takumi 23179ae2f076ca5ab1feb3ba95629099ec2319833701John McCall return Owned(new (Context) ObjCAtThrowStmt(AtLoc, Throw)); 2318d1377b25a36adfe6604f78cbd3a23a07cf0f29e6Douglas Gregor} 2319d1377b25a36adfe6604f78cbd3a23a07cf0f29e6Douglas Gregor 232060d7b3a319d84d688752be3870615ac0f111fb16John McCallStmtResult 2321dfbb02a16ac8c764b5ba1742450513d6212d2f9fNAKAMURA TakumiSema::ActOnObjCAtThrowStmt(SourceLocation AtLoc, Expr *Throw, 2322d1377b25a36adfe6604f78cbd3a23a07cf0f29e6Douglas Gregor Scope *CurScope) { 2323da4b7cf09ebfd4e4098b516081fa9dae2f5c99e0Anders Carlsson if (!getLangOptions().ObjCExceptions) 2324da4b7cf09ebfd4e4098b516081fa9dae2f5c99e0Anders Carlsson Diag(AtLoc, diag::err_objc_exceptions_disabled) << "@throw"; 2325da4b7cf09ebfd4e4098b516081fa9dae2f5c99e0Anders Carlsson 23269ae2f076ca5ab1feb3ba95629099ec2319833701John McCall if (!Throw) { 2327e21dd6ffef4585fa43cd3586ed971217d65bf56cSteve Naroff // @throw without an expression designates a rethrow (which much occur 2328e21dd6ffef4585fa43cd3586ed971217d65bf56cSteve Naroff // in the context of an @catch clause). 2329e21dd6ffef4585fa43cd3586ed971217d65bf56cSteve Naroff Scope *AtCatchParent = CurScope; 2330e21dd6ffef4585fa43cd3586ed971217d65bf56cSteve Naroff while (AtCatchParent && !AtCatchParent->isAtCatchScope()) 2331e21dd6ffef4585fa43cd3586ed971217d65bf56cSteve Naroff AtCatchParent = AtCatchParent->getParent(); 2332e21dd6ffef4585fa43cd3586ed971217d65bf56cSteve Naroff if (!AtCatchParent) 23334ab2414f297fab1b290e77bfc3b049ccf45eda81Steve Naroff return StmtError(Diag(AtLoc, diag::error_rethrow_used_outside_catch)); 2334dfbb02a16ac8c764b5ba1742450513d6212d2f9fNAKAMURA Takumi } 2335f2dd68fb37a62571a4985c8dd05310ac90d07ef0Fariborz Jahanian 23369ae2f076ca5ab1feb3ba95629099ec2319833701John McCall return BuildObjCAtThrowStmt(AtLoc, Throw); 233739f8f159c488a900e5958d5aab3e467af9ec8a2bFariborz Jahanian} 2338bd49a647afd9cc534fef13cadf652d4e9c396e2bFariborz Jahanian 233907524039dce5c820f111a1b3f772b4261f004b4aJohn McCallExprResult 234007524039dce5c820f111a1b3f772b4261f004b4aJohn McCallSema::ActOnObjCAtSynchronizedOperand(SourceLocation atLoc, Expr *operand) { 234107524039dce5c820f111a1b3f772b4261f004b4aJohn McCall ExprResult result = DefaultLvalueConversion(operand); 234207524039dce5c820f111a1b3f772b4261f004b4aJohn McCall if (result.isInvalid()) 234307524039dce5c820f111a1b3f772b4261f004b4aJohn McCall return ExprError(); 234407524039dce5c820f111a1b3f772b4261f004b4aJohn McCall operand = result.take(); 23455e3c67b4bd894a926282d24b4d0cbc0e123c9f4aJohn McCall 2346a868a203a18571d091e5d226f5f100d4440f3d94Chris Lattner // Make sure the expression type is an ObjC pointer or "void *". 234707524039dce5c820f111a1b3f772b4261f004b4aJohn McCall QualType type = operand->getType(); 234807524039dce5c820f111a1b3f772b4261f004b4aJohn McCall if (!type->isDependentType() && 234907524039dce5c820f111a1b3f772b4261f004b4aJohn McCall !type->isObjCObjectPointerType()) { 235007524039dce5c820f111a1b3f772b4261f004b4aJohn McCall const PointerType *pointerType = type->getAs<PointerType>(); 235107524039dce5c820f111a1b3f772b4261f004b4aJohn McCall if (!pointerType || !pointerType->getPointeeType()->isVoidType()) 235207524039dce5c820f111a1b3f772b4261f004b4aJohn McCall return Diag(atLoc, diag::error_objc_synchronized_expects_object) 235307524039dce5c820f111a1b3f772b4261f004b4aJohn McCall << type << operand->getSourceRange(); 2354a868a203a18571d091e5d226f5f100d4440f3d94Chris Lattner } 23551eb4433ac451dc16f4133a88af2d002ac26c58efMike Stump 235607524039dce5c820f111a1b3f772b4261f004b4aJohn McCall // The operand to @synchronized is a full-expression. 235707524039dce5c820f111a1b3f772b4261f004b4aJohn McCall return MaybeCreateExprWithCleanups(operand); 235807524039dce5c820f111a1b3f772b4261f004b4aJohn McCall} 235907524039dce5c820f111a1b3f772b4261f004b4aJohn McCall 236007524039dce5c820f111a1b3f772b4261f004b4aJohn McCallStmtResult 236107524039dce5c820f111a1b3f772b4261f004b4aJohn McCallSema::ActOnObjCAtSynchronizedStmt(SourceLocation AtLoc, Expr *SyncExpr, 236207524039dce5c820f111a1b3f772b4261f004b4aJohn McCall Stmt *SyncBody) { 236307524039dce5c820f111a1b3f772b4261f004b4aJohn McCall // We can't jump into or indirect-jump out of a @synchronized block. 236407524039dce5c820f111a1b3f772b4261f004b4aJohn McCall getCurFunction()->setHasBranchProtectedScope(); 23659ae2f076ca5ab1feb3ba95629099ec2319833701John McCall return Owned(new (Context) ObjCAtSynchronizedStmt(AtLoc, SyncExpr, SyncBody)); 2366fa3ee8e6776634caf064ba5928ca7699d317a280Fariborz Jahanian} 23674b07b2968f87f3cd5a3d8c76145f1cbfd718d42dSebastian Redl 23684b07b2968f87f3cd5a3d8c76145f1cbfd718d42dSebastian Redl/// ActOnCXXCatchBlock - Takes an exception declaration and a handler block 23694b07b2968f87f3cd5a3d8c76145f1cbfd718d42dSebastian Redl/// and creates a proper catch handler from them. 237060d7b3a319d84d688752be3870615ac0f111fb16John McCallStmtResult 2371d226f65006733ed7f709c3174f22ce33391cb58fJohn McCallSema::ActOnCXXCatchBlock(SourceLocation CatchLoc, Decl *ExDecl, 23729ae2f076ca5ab1feb3ba95629099ec2319833701John McCall Stmt *HandlerBlock) { 23734b07b2968f87f3cd5a3d8c76145f1cbfd718d42dSebastian Redl // There's nothing to test that ActOnExceptionDecl didn't already test. 23748189cde56b4f6f938cd65f53c932fe1860d0204cTed Kremenek return Owned(new (Context) CXXCatchStmt(CatchLoc, 2375d226f65006733ed7f709c3174f22ce33391cb58fJohn McCall cast_or_null<VarDecl>(ExDecl), 23769ae2f076ca5ab1feb3ba95629099ec2319833701John McCall HandlerBlock)); 23774b07b2968f87f3cd5a3d8c76145f1cbfd718d42dSebastian Redl} 23788351da06ca3082dfd49dd8e3c1785a986920f57cSebastian Redl 2379f85e193739c953358c865005855253af4f68a497John McCallStmtResult 2380f85e193739c953358c865005855253af4f68a497John McCallSema::ActOnObjCAutoreleasePoolStmt(SourceLocation AtLoc, Stmt *Body) { 2381f85e193739c953358c865005855253af4f68a497John McCall getCurFunction()->setHasBranchProtectedScope(); 2382f85e193739c953358c865005855253af4f68a497John McCall return Owned(new (Context) ObjCAutoreleasePoolStmt(AtLoc, Body)); 2383f85e193739c953358c865005855253af4f68a497John McCall} 2384f85e193739c953358c865005855253af4f68a497John McCall 23853c46e8db99196179b30e7ac5c20c4efd5f3926d7Dan Gohmannamespace { 23863c46e8db99196179b30e7ac5c20c4efd5f3926d7Dan Gohman 2387c447aba04527a71d254b151f79f444d1cbe83ce9Sebastian Redlclass TypeWithHandler { 2388c447aba04527a71d254b151f79f444d1cbe83ce9Sebastian Redl QualType t; 2389c447aba04527a71d254b151f79f444d1cbe83ce9Sebastian Redl CXXCatchStmt *stmt; 2390c447aba04527a71d254b151f79f444d1cbe83ce9Sebastian Redlpublic: 2391c447aba04527a71d254b151f79f444d1cbe83ce9Sebastian Redl TypeWithHandler(const QualType &type, CXXCatchStmt *statement) 2392c447aba04527a71d254b151f79f444d1cbe83ce9Sebastian Redl : t(type), stmt(statement) {} 2393c447aba04527a71d254b151f79f444d1cbe83ce9Sebastian Redl 23940953e767ff7817f97b3ab20896b229891eeff45bJohn McCall // An arbitrary order is fine as long as it places identical 23950953e767ff7817f97b3ab20896b229891eeff45bJohn McCall // types next to each other. 2396c447aba04527a71d254b151f79f444d1cbe83ce9Sebastian Redl bool operator<(const TypeWithHandler &y) const { 23970953e767ff7817f97b3ab20896b229891eeff45bJohn McCall if (t.getAsOpaquePtr() < y.t.getAsOpaquePtr()) 2398c447aba04527a71d254b151f79f444d1cbe83ce9Sebastian Redl return true; 23990953e767ff7817f97b3ab20896b229891eeff45bJohn McCall if (t.getAsOpaquePtr() > y.t.getAsOpaquePtr()) 2400c447aba04527a71d254b151f79f444d1cbe83ce9Sebastian Redl return false; 2401c447aba04527a71d254b151f79f444d1cbe83ce9Sebastian Redl else 2402c447aba04527a71d254b151f79f444d1cbe83ce9Sebastian Redl return getTypeSpecStartLoc() < y.getTypeSpecStartLoc(); 2403c447aba04527a71d254b151f79f444d1cbe83ce9Sebastian Redl } 24041eb4433ac451dc16f4133a88af2d002ac26c58efMike Stump 2405c447aba04527a71d254b151f79f444d1cbe83ce9Sebastian Redl bool operator==(const TypeWithHandler& other) const { 24060953e767ff7817f97b3ab20896b229891eeff45bJohn McCall return t == other.t; 2407c447aba04527a71d254b151f79f444d1cbe83ce9Sebastian Redl } 24081eb4433ac451dc16f4133a88af2d002ac26c58efMike Stump 2409c447aba04527a71d254b151f79f444d1cbe83ce9Sebastian Redl CXXCatchStmt *getCatchStmt() const { return stmt; } 2410c447aba04527a71d254b151f79f444d1cbe83ce9Sebastian Redl SourceLocation getTypeSpecStartLoc() const { 2411c447aba04527a71d254b151f79f444d1cbe83ce9Sebastian Redl return stmt->getExceptionDecl()->getTypeSpecStartLoc(); 2412c447aba04527a71d254b151f79f444d1cbe83ce9Sebastian Redl } 2413c447aba04527a71d254b151f79f444d1cbe83ce9Sebastian Redl}; 2414c447aba04527a71d254b151f79f444d1cbe83ce9Sebastian Redl 24153c46e8db99196179b30e7ac5c20c4efd5f3926d7Dan Gohman} 24163c46e8db99196179b30e7ac5c20c4efd5f3926d7Dan Gohman 24178351da06ca3082dfd49dd8e3c1785a986920f57cSebastian Redl/// ActOnCXXTryBlock - Takes a try compound-statement and a number of 24188351da06ca3082dfd49dd8e3c1785a986920f57cSebastian Redl/// handlers and creates a try statement from them. 241960d7b3a319d84d688752be3870615ac0f111fb16John McCallStmtResult 24209ae2f076ca5ab1feb3ba95629099ec2319833701John McCallSema::ActOnCXXTryBlock(SourceLocation TryLoc, Stmt *TryBlock, 24218351da06ca3082dfd49dd8e3c1785a986920f57cSebastian Redl MultiStmtArg RawHandlers) { 2422729b853f4bfa83e53c638a06a9dccf83b4e1f720Anders Carlsson // Don't report an error if 'try' is used in system headers. 242315348aeb81285c75b2e92b5bf8d2db3445d147c2Anders Carlsson if (!getLangOptions().CXXExceptions && 2424729b853f4bfa83e53c638a06a9dccf83b4e1f720Anders Carlsson !getSourceManager().isInSystemHeader(TryLoc)) 2425729b853f4bfa83e53c638a06a9dccf83b4e1f720Anders Carlsson Diag(TryLoc, diag::err_exceptions_disabled) << "try"; 24267f11d9cf5df1f8ce82af46eabc4ec5cec7d580b0Anders Carlsson 24278351da06ca3082dfd49dd8e3c1785a986920f57cSebastian Redl unsigned NumHandlers = RawHandlers.size(); 24288351da06ca3082dfd49dd8e3c1785a986920f57cSebastian Redl assert(NumHandlers > 0 && 24298351da06ca3082dfd49dd8e3c1785a986920f57cSebastian Redl "The parser shouldn't call this if there are no handlers."); 24309ae2f076ca5ab1feb3ba95629099ec2319833701John McCall Stmt **Handlers = RawHandlers.get(); 24318351da06ca3082dfd49dd8e3c1785a986920f57cSebastian Redl 24325f9e272e632e951b1efe824cd16acb4d96077930Chris Lattner SmallVector<TypeWithHandler, 8> TypesWithHandlers; 24331eb4433ac451dc16f4133a88af2d002ac26c58efMike Stump 24341eb4433ac451dc16f4133a88af2d002ac26c58efMike Stump for (unsigned i = 0; i < NumHandlers; ++i) { 24355f9e272e632e951b1efe824cd16acb4d96077930Chris Lattner CXXCatchStmt *Handler = cast<CXXCatchStmt>(Handlers[i]); 2436c447aba04527a71d254b151f79f444d1cbe83ce9Sebastian Redl if (!Handler->getExceptionDecl()) { 2437c447aba04527a71d254b151f79f444d1cbe83ce9Sebastian Redl if (i < NumHandlers - 1) 2438c447aba04527a71d254b151f79f444d1cbe83ce9Sebastian Redl return StmtError(Diag(Handler->getLocStart(), 2439c447aba04527a71d254b151f79f444d1cbe83ce9Sebastian Redl diag::err_early_catch_all)); 24401eb4433ac451dc16f4133a88af2d002ac26c58efMike Stump 2441c447aba04527a71d254b151f79f444d1cbe83ce9Sebastian Redl continue; 2442c447aba04527a71d254b151f79f444d1cbe83ce9Sebastian Redl } 24431eb4433ac451dc16f4133a88af2d002ac26c58efMike Stump 2444c447aba04527a71d254b151f79f444d1cbe83ce9Sebastian Redl const QualType CaughtType = Handler->getCaughtType(); 2445c447aba04527a71d254b151f79f444d1cbe83ce9Sebastian Redl const QualType CanonicalCaughtType = Context.getCanonicalType(CaughtType); 2446c447aba04527a71d254b151f79f444d1cbe83ce9Sebastian Redl TypesWithHandlers.push_back(TypeWithHandler(CanonicalCaughtType, Handler)); 2447c447aba04527a71d254b151f79f444d1cbe83ce9Sebastian Redl } 2448c447aba04527a71d254b151f79f444d1cbe83ce9Sebastian Redl 2449c447aba04527a71d254b151f79f444d1cbe83ce9Sebastian Redl // Detect handlers for the same type as an earlier one. 2450c447aba04527a71d254b151f79f444d1cbe83ce9Sebastian Redl if (NumHandlers > 1) { 2451c447aba04527a71d254b151f79f444d1cbe83ce9Sebastian Redl llvm::array_pod_sort(TypesWithHandlers.begin(), TypesWithHandlers.end()); 24521eb4433ac451dc16f4133a88af2d002ac26c58efMike Stump 2453c447aba04527a71d254b151f79f444d1cbe83ce9Sebastian Redl TypeWithHandler prev = TypesWithHandlers[0]; 2454c447aba04527a71d254b151f79f444d1cbe83ce9Sebastian Redl for (unsigned i = 1; i < TypesWithHandlers.size(); ++i) { 2455c447aba04527a71d254b151f79f444d1cbe83ce9Sebastian Redl TypeWithHandler curr = TypesWithHandlers[i]; 24561eb4433ac451dc16f4133a88af2d002ac26c58efMike Stump 2457c447aba04527a71d254b151f79f444d1cbe83ce9Sebastian Redl if (curr == prev) { 2458c447aba04527a71d254b151f79f444d1cbe83ce9Sebastian Redl Diag(curr.getTypeSpecStartLoc(), 2459c447aba04527a71d254b151f79f444d1cbe83ce9Sebastian Redl diag::warn_exception_caught_by_earlier_handler) 2460c447aba04527a71d254b151f79f444d1cbe83ce9Sebastian Redl << curr.getCatchStmt()->getCaughtType().getAsString(); 2461c447aba04527a71d254b151f79f444d1cbe83ce9Sebastian Redl Diag(prev.getTypeSpecStartLoc(), 2462c447aba04527a71d254b151f79f444d1cbe83ce9Sebastian Redl diag::note_previous_exception_handler) 2463c447aba04527a71d254b151f79f444d1cbe83ce9Sebastian Redl << prev.getCatchStmt()->getCaughtType().getAsString(); 2464c447aba04527a71d254b151f79f444d1cbe83ce9Sebastian Redl } 24651eb4433ac451dc16f4133a88af2d002ac26c58efMike Stump 2466c447aba04527a71d254b151f79f444d1cbe83ce9Sebastian Redl prev = curr; 2467c447aba04527a71d254b151f79f444d1cbe83ce9Sebastian Redl } 24688351da06ca3082dfd49dd8e3c1785a986920f57cSebastian Redl } 24691eb4433ac451dc16f4133a88af2d002ac26c58efMike Stump 2470781472fe99a120098c631b0cbe33c89f8cef5e70John McCall getCurFunction()->setHasBranchProtectedScope(); 2471b60a77e453d32db0ab1914d28e175c2defc0eb65John McCall 24728351da06ca3082dfd49dd8e3c1785a986920f57cSebastian Redl // FIXME: We should detect handlers that cannot catch anything because an 24738351da06ca3082dfd49dd8e3c1785a986920f57cSebastian Redl // earlier handler catches a superclass. Need to find a method that is not 24748351da06ca3082dfd49dd8e3c1785a986920f57cSebastian Redl // quadratic for this. 24758351da06ca3082dfd49dd8e3c1785a986920f57cSebastian Redl // Neither of these are explicitly forbidden, but every compiler detects them 24768351da06ca3082dfd49dd8e3c1785a986920f57cSebastian Redl // and warns. 24778351da06ca3082dfd49dd8e3c1785a986920f57cSebastian Redl 24789ae2f076ca5ab1feb3ba95629099ec2319833701John McCall return Owned(CXXTryStmt::Create(Context, TryLoc, TryBlock, 2479a1a396df16c02b22983b5c9592022fd9237d4866Sam Weinig Handlers, NumHandlers)); 24808351da06ca3082dfd49dd8e3c1785a986920f57cSebastian Redl} 248128bbe4b8acc338476fe0825769b41fb32b423c72John Wiegley 248228bbe4b8acc338476fe0825769b41fb32b423c72John WiegleyStmtResult 248328bbe4b8acc338476fe0825769b41fb32b423c72John WiegleySema::ActOnSEHTryBlock(bool IsCXXTry, 248428bbe4b8acc338476fe0825769b41fb32b423c72John Wiegley SourceLocation TryLoc, 248528bbe4b8acc338476fe0825769b41fb32b423c72John Wiegley Stmt *TryBlock, 248628bbe4b8acc338476fe0825769b41fb32b423c72John Wiegley Stmt *Handler) { 248728bbe4b8acc338476fe0825769b41fb32b423c72John Wiegley assert(TryBlock && Handler); 248828bbe4b8acc338476fe0825769b41fb32b423c72John Wiegley 248928bbe4b8acc338476fe0825769b41fb32b423c72John Wiegley getCurFunction()->setHasBranchProtectedScope(); 249028bbe4b8acc338476fe0825769b41fb32b423c72John Wiegley 249128bbe4b8acc338476fe0825769b41fb32b423c72John Wiegley return Owned(SEHTryStmt::Create(Context,IsCXXTry,TryLoc,TryBlock,Handler)); 249228bbe4b8acc338476fe0825769b41fb32b423c72John Wiegley} 249328bbe4b8acc338476fe0825769b41fb32b423c72John Wiegley 249428bbe4b8acc338476fe0825769b41fb32b423c72John WiegleyStmtResult 249528bbe4b8acc338476fe0825769b41fb32b423c72John WiegleySema::ActOnSEHExceptBlock(SourceLocation Loc, 249628bbe4b8acc338476fe0825769b41fb32b423c72John Wiegley Expr *FilterExpr, 249728bbe4b8acc338476fe0825769b41fb32b423c72John Wiegley Stmt *Block) { 249828bbe4b8acc338476fe0825769b41fb32b423c72John Wiegley assert(FilterExpr && Block); 249928bbe4b8acc338476fe0825769b41fb32b423c72John Wiegley 250028bbe4b8acc338476fe0825769b41fb32b423c72John Wiegley if(!FilterExpr->getType()->isIntegerType()) { 250158f14c012e5d739b09532bb12645dc161f88cfcfFrancois Pichet return StmtError(Diag(FilterExpr->getExprLoc(), 250258f14c012e5d739b09532bb12645dc161f88cfcfFrancois Pichet diag::err_filter_expression_integral) 250358f14c012e5d739b09532bb12645dc161f88cfcfFrancois Pichet << FilterExpr->getType()); 250428bbe4b8acc338476fe0825769b41fb32b423c72John Wiegley } 250528bbe4b8acc338476fe0825769b41fb32b423c72John Wiegley 250628bbe4b8acc338476fe0825769b41fb32b423c72John Wiegley return Owned(SEHExceptStmt::Create(Context,Loc,FilterExpr,Block)); 250728bbe4b8acc338476fe0825769b41fb32b423c72John Wiegley} 250828bbe4b8acc338476fe0825769b41fb32b423c72John Wiegley 250928bbe4b8acc338476fe0825769b41fb32b423c72John WiegleyStmtResult 251028bbe4b8acc338476fe0825769b41fb32b423c72John WiegleySema::ActOnSEHFinallyBlock(SourceLocation Loc, 251128bbe4b8acc338476fe0825769b41fb32b423c72John Wiegley Stmt *Block) { 251228bbe4b8acc338476fe0825769b41fb32b423c72John Wiegley assert(Block); 251328bbe4b8acc338476fe0825769b41fb32b423c72John Wiegley return Owned(SEHFinallyStmt::Create(Context,Loc,Block)); 251428bbe4b8acc338476fe0825769b41fb32b423c72John Wiegley} 2515