CodeGenFunction.cpp revision a782ca76cc7dfdd69e331a4fa722fc23b18d5c34
15f016e2cb5d11daeb237544de1c5d59f20fe1a6eReid Spencer//===--- CodeGenFunction.cpp - Emit LLVM Code from ASTs for a Function ----===// 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 coordinates the per-function state used while generating code. 115f016e2cb5d11daeb237544de1c5d59f20fe1a6eReid Spencer// 125f016e2cb5d11daeb237544de1c5d59f20fe1a6eReid Spencer//===----------------------------------------------------------------------===// 135f016e2cb5d11daeb237544de1c5d59f20fe1a6eReid Spencer 145f016e2cb5d11daeb237544de1c5d59f20fe1a6eReid Spencer#include "CodeGenFunction.h" 155f016e2cb5d11daeb237544de1c5d59f20fe1a6eReid Spencer#include "CodeGenModule.h" 163f2af1002249c8acc9ce17f1fc50324864feb8e1Eli Friedman#include "CGDebugInfo.h" 175f016e2cb5d11daeb237544de1c5d59f20fe1a6eReid Spencer#include "clang/Basic/TargetInfo.h" 1831a0984b5cb4af99d2407c0f25bf5af68df681c6Chris Lattner#include "clang/AST/APValue.h" 19de7fb8413b13651fd85b7125d08b3c9ac2816d9dDaniel Dunbar#include "clang/AST/ASTContext.h" 20c4a1dea2dc56bd1357ec91b829a0b9e68229a13eDaniel Dunbar#include "clang/AST/Decl.h" 21d9363c3a80168283b3da518b4e17f545a6246857Devang Patel#include "llvm/Support/CFG.h" 225f016e2cb5d11daeb237544de1c5d59f20fe1a6eReid Spencerusing namespace clang; 235f016e2cb5d11daeb237544de1c5d59f20fe1a6eReid Spencerusing namespace CodeGen; 245f016e2cb5d11daeb237544de1c5d59f20fe1a6eReid Spencer 255f016e2cb5d11daeb237544de1c5d59f20fe1a6eReid SpencerCodeGenFunction::CodeGenFunction(CodeGenModule &cgm) 26c049e4f406a7f7179eba98659044a32508e53289Devang Patel : CGM(cgm), Target(CGM.getContext().Target), SwitchInsn(NULL), 274111024be81e7c0525e42dadcc126d27e5bf2425Chris Lattner CaseRangeBlock(NULL) { 284111024be81e7c0525e42dadcc126d27e5bf2425Chris Lattner LLVMIntTy = ConvertType(getContext().IntTy); 294111024be81e7c0525e42dadcc126d27e5bf2425Chris Lattner LLVMPointerWidth = Target.getPointerWidth(0); 304111024be81e7c0525e42dadcc126d27e5bf2425Chris Lattner} 315f016e2cb5d11daeb237544de1c5d59f20fe1a6eReid Spencer 325f016e2cb5d11daeb237544de1c5d59f20fe1a6eReid SpencerASTContext &CodeGenFunction::getContext() const { 335f016e2cb5d11daeb237544de1c5d59f20fe1a6eReid Spencer return CGM.getContext(); 345f016e2cb5d11daeb237544de1c5d59f20fe1a6eReid Spencer} 355f016e2cb5d11daeb237544de1c5d59f20fe1a6eReid Spencer 365f016e2cb5d11daeb237544de1c5d59f20fe1a6eReid Spencer 375f016e2cb5d11daeb237544de1c5d59f20fe1a6eReid Spencerllvm::BasicBlock *CodeGenFunction::getBasicBlockForLabel(const LabelStmt *S) { 385f016e2cb5d11daeb237544de1c5d59f20fe1a6eReid Spencer llvm::BasicBlock *&BB = LabelMap[S]; 395f016e2cb5d11daeb237544de1c5d59f20fe1a6eReid Spencer if (BB) return BB; 405f016e2cb5d11daeb237544de1c5d59f20fe1a6eReid Spencer 415f016e2cb5d11daeb237544de1c5d59f20fe1a6eReid Spencer // Create, but don't insert, the new block. 4255e874299f2ad827646a4ca9ea38c402aaeb38c9Daniel Dunbar return BB = createBasicBlock(S->getName()); 435f016e2cb5d11daeb237544de1c5d59f20fe1a6eReid Spencer} 445f016e2cb5d11daeb237544de1c5d59f20fe1a6eReid Spencer 45813733577d33ec56479667b49e1bff42dc6bba90Lauro Ramos Venanciollvm::Constant * 46248a753f6b670692523c99afaeb8fe98f7ae3ca7Steve NaroffCodeGenFunction::GetAddrOfStaticLocalVar(const VarDecl *BVD) { 47813733577d33ec56479667b49e1bff42dc6bba90Lauro Ramos Venancio return cast<llvm::Constant>(LocalDeclMap[BVD]); 48813733577d33ec56479667b49e1bff42dc6bba90Lauro Ramos Venancio} 495f016e2cb5d11daeb237544de1c5d59f20fe1a6eReid Spencer 50dde0a94120915fa925d1ffcdb997c7b44dc9fa21Anders Carlssonllvm::Value *CodeGenFunction::GetAddrOfLocalVar(const VarDecl *VD) 51dde0a94120915fa925d1ffcdb997c7b44dc9fa21Anders Carlsson{ 52dde0a94120915fa925d1ffcdb997c7b44dc9fa21Anders Carlsson return LocalDeclMap[VD]; 53dde0a94120915fa925d1ffcdb997c7b44dc9fa21Anders Carlsson} 54dde0a94120915fa925d1ffcdb997c7b44dc9fa21Anders Carlsson 555f016e2cb5d11daeb237544de1c5d59f20fe1a6eReid Spencerconst llvm::Type *CodeGenFunction::ConvertType(QualType T) { 565f016e2cb5d11daeb237544de1c5d59f20fe1a6eReid Spencer return CGM.getTypes().ConvertType(T); 575f016e2cb5d11daeb237544de1c5d59f20fe1a6eReid Spencer} 585f016e2cb5d11daeb237544de1c5d59f20fe1a6eReid Spencer 594111024be81e7c0525e42dadcc126d27e5bf2425Chris Lattnerbool CodeGenFunction::isObjCPointerType(QualType T) { 604111024be81e7c0525e42dadcc126d27e5bf2425Chris Lattner // All Objective-C types are pointers. 614111024be81e7c0525e42dadcc126d27e5bf2425Chris Lattner return T->isObjCInterfaceType() || 624111024be81e7c0525e42dadcc126d27e5bf2425Chris Lattner T->isObjCQualifiedInterfaceType() || T->isObjCQualifiedIdType(); 635f016e2cb5d11daeb237544de1c5d59f20fe1a6eReid Spencer} 645f016e2cb5d11daeb237544de1c5d59f20fe1a6eReid Spencer 654111024be81e7c0525e42dadcc126d27e5bf2425Chris Lattnerbool CodeGenFunction::hasAggregateLLVMType(QualType T) { 66a782ca76cc7dfdd69e331a4fa722fc23b18d5c34Daniel Dunbar // FIXME: Use positive checks instead of negative ones to be more 67a782ca76cc7dfdd69e331a4fa722fc23b18d5c34Daniel Dunbar // robust in the face of extension. 684111024be81e7c0525e42dadcc126d27e5bf2425Chris Lattner return !isObjCPointerType(T) &&!T->isRealType() && !T->isPointerLikeType() && 69a782ca76cc7dfdd69e331a4fa722fc23b18d5c34Daniel Dunbar !T->isVoidType() && !T->isVectorType() && !T->isFunctionType() && 70a782ca76cc7dfdd69e331a4fa722fc23b18d5c34Daniel Dunbar !T->isBlockPointerType(); 714111024be81e7c0525e42dadcc126d27e5bf2425Chris Lattner} 72391d77a26382dddf25da73e29fc1fa5aaaea4c6fChris Lattner 73af05bb9073319d8381b71c4325188853fd4b8ed6Daniel Dunbarvoid CodeGenFunction::FinishFunction(SourceLocation EndLoc) { 740ffb125996336fc7602b162c0a9e392f1a93060fDaniel Dunbar // Finish emission of indirect switches. 750ffb125996336fc7602b162c0a9e392f1a93060fDaniel Dunbar EmitIndirectSwitches(); 760ffb125996336fc7602b162c0a9e392f1a93060fDaniel Dunbar 77391d77a26382dddf25da73e29fc1fa5aaaea4c6fChris Lattner assert(BreakContinueStack.empty() && 78391d77a26382dddf25da73e29fc1fa5aaaea4c6fChris Lattner "mismatched push/pop in break/continue stack!"); 795ca2084cf9b529563209429857f01fdae9dcdfa5Daniel Dunbar 80b01d191a25f92884855117ee7113a1bd3b59cdbcDaniel Dunbar // Emit function epilog (to return). This has the nice side effect 81b01d191a25f92884855117ee7113a1bd3b59cdbcDaniel Dunbar // of also automatically handling code that falls off the end. 82b01d191a25f92884855117ee7113a1bd3b59cdbcDaniel Dunbar EmitBlock(ReturnBlock); 83f5bd45c8e6fa7519cdc17ec3ff4917e279c6a041Daniel Dunbar 84f5bd45c8e6fa7519cdc17ec3ff4917e279c6a041Daniel Dunbar // Emit debug descriptor for function end. 85f5bd45c8e6fa7519cdc17ec3ff4917e279c6a041Daniel Dunbar if (CGDebugInfo *DI = CGM.getDebugInfo()) { 86f5bd45c8e6fa7519cdc17ec3ff4917e279c6a041Daniel Dunbar DI->setLocation(EndLoc); 87f5bd45c8e6fa7519cdc17ec3ff4917e279c6a041Daniel Dunbar DI->EmitRegionEnd(CurFn, Builder); 88f5bd45c8e6fa7519cdc17ec3ff4917e279c6a041Daniel Dunbar } 89f5bd45c8e6fa7519cdc17ec3ff4917e279c6a041Daniel Dunbar 9017b708d61827cd86278e9580b041dd6cbadf07d3Daniel Dunbar EmitFunctionEpilog(FnRetTy, ReturnValue); 915ca2084cf9b529563209429857f01fdae9dcdfa5Daniel Dunbar 92391d77a26382dddf25da73e29fc1fa5aaaea4c6fChris Lattner // Remove the AllocaInsertPt instruction, which is just a convenience for us. 93391d77a26382dddf25da73e29fc1fa5aaaea4c6fChris Lattner AllocaInsertPt->eraseFromParent(); 94391d77a26382dddf25da73e29fc1fa5aaaea4c6fChris Lattner AllocaInsertPt = 0; 95c8aa5f1f264fb230c38182adab944232bb160c2bChris Lattner} 96c8aa5f1f264fb230c38182adab944232bb160c2bChris Lattner 977c086516f3cc9fba2733b1919973206c6ba4b171Daniel Dunbarvoid CodeGenFunction::StartFunction(const Decl *D, QualType RetTy, 987c086516f3cc9fba2733b1919973206c6ba4b171Daniel Dunbar llvm::Function *Fn, 992284ac9ec80299fcdefae9a2787cf85105a0f203Daniel Dunbar const FunctionArgList &Args, 1002284ac9ec80299fcdefae9a2787cf85105a0f203Daniel Dunbar SourceLocation StartLoc) { 1017c086516f3cc9fba2733b1919973206c6ba4b171Daniel Dunbar CurFuncDecl = D; 1027c086516f3cc9fba2733b1919973206c6ba4b171Daniel Dunbar FnRetTy = RetTy; 103bd012ff1fa088181646a784f385b28867372d434Daniel Dunbar CurFn = Fn; 1045f016e2cb5d11daeb237544de1c5d59f20fe1a6eReid Spencer assert(CurFn->isDeclaration() && "Function already has body?"); 105ddee4231e9bdfbac1e1f5385ff1a17fd0e0b0e39Chris Lattner 10655e874299f2ad827646a4ca9ea38c402aaeb38c9Daniel Dunbar llvm::BasicBlock *EntryBB = createBasicBlock("entry", CurFn); 1075ca2084cf9b529563209429857f01fdae9dcdfa5Daniel Dunbar 1085f016e2cb5d11daeb237544de1c5d59f20fe1a6eReid Spencer // Create a marker to make it easy to insert allocas into the entryblock 10955352a2d616cf9fbb621d10faf8b960b4b268bd8Chris Lattner // later. Don't create this with the builder, because we don't want it 11055352a2d616cf9fbb621d10faf8b960b4b268bd8Chris Lattner // folded. 1115f016e2cb5d11daeb237544de1c5d59f20fe1a6eReid Spencer llvm::Value *Undef = llvm::UndefValue::get(llvm::Type::Int32Ty); 11255352a2d616cf9fbb621d10faf8b960b4b268bd8Chris Lattner AllocaInsertPt = new llvm::BitCastInst(Undef, llvm::Type::Int32Ty, "allocapt", 11355352a2d616cf9fbb621d10faf8b960b4b268bd8Chris Lattner EntryBB); 1145ca2084cf9b529563209429857f01fdae9dcdfa5Daniel Dunbar 11555e874299f2ad827646a4ca9ea38c402aaeb38c9Daniel Dunbar ReturnBlock = createBasicBlock("return"); 1165ca2084cf9b529563209429857f01fdae9dcdfa5Daniel Dunbar ReturnValue = 0; 1177c086516f3cc9fba2733b1919973206c6ba4b171Daniel Dunbar if (!RetTy->isVoidType()) 1187c086516f3cc9fba2733b1919973206c6ba4b171Daniel Dunbar ReturnValue = CreateTempAlloca(ConvertType(RetTy), "retval"); 1195ca2084cf9b529563209429857f01fdae9dcdfa5Daniel Dunbar 12055352a2d616cf9fbb621d10faf8b960b4b268bd8Chris Lattner Builder.SetInsertPoint(EntryBB); 1214111024be81e7c0525e42dadcc126d27e5bf2425Chris Lattner 122af99417156c652a6f04dff643925036dc3241d60Sanjiv Gupta // Emit subprogram debug descriptor. 1237c086516f3cc9fba2733b1919973206c6ba4b171Daniel Dunbar // FIXME: The cast here is a huge hack. 1242284ac9ec80299fcdefae9a2787cf85105a0f203Daniel Dunbar if (CGDebugInfo *DI = CGM.getDebugInfo()) { 1252284ac9ec80299fcdefae9a2787cf85105a0f203Daniel Dunbar DI->setLocation(StartLoc); 1262284ac9ec80299fcdefae9a2787cf85105a0f203Daniel Dunbar if (const FunctionDecl *FD = dyn_cast<FunctionDecl>(D)) { 1278ec03f58c33c33a917f54bb7f2cd61b6d7ffe0caChris Lattner DI->EmitFunctionStart(FD->getIdentifier()->getName(), 1288ec03f58c33c33a917f54bb7f2cd61b6d7ffe0caChris Lattner RetTy, CurFn, Builder); 1292284ac9ec80299fcdefae9a2787cf85105a0f203Daniel Dunbar } else { 1302284ac9ec80299fcdefae9a2787cf85105a0f203Daniel Dunbar // Just use LLVM function name. 1312284ac9ec80299fcdefae9a2787cf85105a0f203Daniel Dunbar DI->EmitFunctionStart(Fn->getName().c_str(), 1322284ac9ec80299fcdefae9a2787cf85105a0f203Daniel Dunbar RetTy, CurFn, Builder); 133af99417156c652a6f04dff643925036dc3241d60Sanjiv Gupta } 134af99417156c652a6f04dff643925036dc3241d60Sanjiv Gupta } 135af99417156c652a6f04dff643925036dc3241d60Sanjiv Gupta 13617b708d61827cd86278e9580b041dd6cbadf07d3Daniel Dunbar EmitFunctionProlog(CurFn, FnRetTy, Args); 137751358ff73b155f5384e151e1d18aa3f6e7b061cAnders Carlsson 138751358ff73b155f5384e151e1d18aa3f6e7b061cAnders Carlsson // If any of the arguments have a variably modified type, make sure to 139751358ff73b155f5384e151e1d18aa3f6e7b061cAnders Carlsson // emit the type size. 140751358ff73b155f5384e151e1d18aa3f6e7b061cAnders Carlsson for (FunctionArgList::const_iterator i = Args.begin(), e = Args.end(); 141751358ff73b155f5384e151e1d18aa3f6e7b061cAnders Carlsson i != e; ++i) { 142751358ff73b155f5384e151e1d18aa3f6e7b061cAnders Carlsson QualType Ty = i->second; 143751358ff73b155f5384e151e1d18aa3f6e7b061cAnders Carlsson 144751358ff73b155f5384e151e1d18aa3f6e7b061cAnders Carlsson if (Ty->isVariablyModifiedType()) 145751358ff73b155f5384e151e1d18aa3f6e7b061cAnders Carlsson EmitVLASize(Ty); 146751358ff73b155f5384e151e1d18aa3f6e7b061cAnders Carlsson } 1477c086516f3cc9fba2733b1919973206c6ba4b171Daniel Dunbar} 148eb4b7051a596560ef4a1846e3714707f44e9dc30Eli Friedman 1497c086516f3cc9fba2733b1919973206c6ba4b171Daniel Dunbarvoid CodeGenFunction::GenerateCode(const FunctionDecl *FD, 1507c086516f3cc9fba2733b1919973206c6ba4b171Daniel Dunbar llvm::Function *Fn) { 1517c086516f3cc9fba2733b1919973206c6ba4b171Daniel Dunbar FunctionArgList Args; 152eb4b7051a596560ef4a1846e3714707f44e9dc30Eli Friedman if (FD->getNumParams()) { 153eb4b7051a596560ef4a1846e3714707f44e9dc30Eli Friedman const FunctionTypeProto* FProto = FD->getType()->getAsFunctionTypeProto(); 154eb4b7051a596560ef4a1846e3714707f44e9dc30Eli Friedman assert(FProto && "Function def must have prototype!"); 1557c086516f3cc9fba2733b1919973206c6ba4b171Daniel Dunbar 1567c086516f3cc9fba2733b1919973206c6ba4b171Daniel Dunbar for (unsigned i = 0, e = FD->getNumParams(); i != e; ++i) 1577c086516f3cc9fba2733b1919973206c6ba4b171Daniel Dunbar Args.push_back(std::make_pair(FD->getParamDecl(i), 1587c086516f3cc9fba2733b1919973206c6ba4b171Daniel Dunbar FProto->getArgType(i))); 1595f016e2cb5d11daeb237544de1c5d59f20fe1a6eReid Spencer } 160af05bb9073319d8381b71c4325188853fd4b8ed6Daniel Dunbar 1612284ac9ec80299fcdefae9a2787cf85105a0f203Daniel Dunbar StartFunction(FD, FD->getResultType(), Fn, Args, 1622284ac9ec80299fcdefae9a2787cf85105a0f203Daniel Dunbar cast<CompoundStmt>(FD->getBody())->getLBracLoc()); 1637c086516f3cc9fba2733b1919973206c6ba4b171Daniel Dunbar 164af05bb9073319d8381b71c4325188853fd4b8ed6Daniel Dunbar EmitStmt(FD->getBody()); 165af05bb9073319d8381b71c4325188853fd4b8ed6Daniel Dunbar 166af05bb9073319d8381b71c4325188853fd4b8ed6Daniel Dunbar const CompoundStmt *S = dyn_cast<CompoundStmt>(FD->getBody()); 167af05bb9073319d8381b71c4325188853fd4b8ed6Daniel Dunbar if (S) { 168af05bb9073319d8381b71c4325188853fd4b8ed6Daniel Dunbar FinishFunction(S->getRBracLoc()); 169af05bb9073319d8381b71c4325188853fd4b8ed6Daniel Dunbar } else { 170af05bb9073319d8381b71c4325188853fd4b8ed6Daniel Dunbar FinishFunction(); 171af05bb9073319d8381b71c4325188853fd4b8ed6Daniel Dunbar } 1725f016e2cb5d11daeb237544de1c5d59f20fe1a6eReid Spencer} 1735f016e2cb5d11daeb237544de1c5d59f20fe1a6eReid Spencer 1740946ccd1e58c1f1da31ddbca67c5b6301ac8b255Chris Lattner/// ContainsLabel - Return true if the statement contains a label in it. If 1750946ccd1e58c1f1da31ddbca67c5b6301ac8b255Chris Lattner/// this statement is not executed normally, it not containing a label means 1760946ccd1e58c1f1da31ddbca67c5b6301ac8b255Chris Lattner/// that we can just remove the code. 1770946ccd1e58c1f1da31ddbca67c5b6301ac8b255Chris Lattnerbool CodeGenFunction::ContainsLabel(const Stmt *S, bool IgnoreCaseStmts) { 1780946ccd1e58c1f1da31ddbca67c5b6301ac8b255Chris Lattner // Null statement, not a label! 1790946ccd1e58c1f1da31ddbca67c5b6301ac8b255Chris Lattner if (S == 0) return false; 1800946ccd1e58c1f1da31ddbca67c5b6301ac8b255Chris Lattner 1810946ccd1e58c1f1da31ddbca67c5b6301ac8b255Chris Lattner // If this is a label, we have to emit the code, consider something like: 1820946ccd1e58c1f1da31ddbca67c5b6301ac8b255Chris Lattner // if (0) { ... foo: bar(); } goto foo; 1830946ccd1e58c1f1da31ddbca67c5b6301ac8b255Chris Lattner if (isa<LabelStmt>(S)) 1840946ccd1e58c1f1da31ddbca67c5b6301ac8b255Chris Lattner return true; 1850946ccd1e58c1f1da31ddbca67c5b6301ac8b255Chris Lattner 1860946ccd1e58c1f1da31ddbca67c5b6301ac8b255Chris Lattner // If this is a case/default statement, and we haven't seen a switch, we have 1870946ccd1e58c1f1da31ddbca67c5b6301ac8b255Chris Lattner // to emit the code. 1880946ccd1e58c1f1da31ddbca67c5b6301ac8b255Chris Lattner if (isa<SwitchCase>(S) && !IgnoreCaseStmts) 1890946ccd1e58c1f1da31ddbca67c5b6301ac8b255Chris Lattner return true; 1900946ccd1e58c1f1da31ddbca67c5b6301ac8b255Chris Lattner 1910946ccd1e58c1f1da31ddbca67c5b6301ac8b255Chris Lattner // If this is a switch statement, we want to ignore cases below it. 1920946ccd1e58c1f1da31ddbca67c5b6301ac8b255Chris Lattner if (isa<SwitchStmt>(S)) 1930946ccd1e58c1f1da31ddbca67c5b6301ac8b255Chris Lattner IgnoreCaseStmts = true; 1940946ccd1e58c1f1da31ddbca67c5b6301ac8b255Chris Lattner 1950946ccd1e58c1f1da31ddbca67c5b6301ac8b255Chris Lattner // Scan subexpressions for verboten labels. 1960946ccd1e58c1f1da31ddbca67c5b6301ac8b255Chris Lattner for (Stmt::const_child_iterator I = S->child_begin(), E = S->child_end(); 1970946ccd1e58c1f1da31ddbca67c5b6301ac8b255Chris Lattner I != E; ++I) 1980946ccd1e58c1f1da31ddbca67c5b6301ac8b255Chris Lattner if (ContainsLabel(*I, IgnoreCaseStmts)) 1990946ccd1e58c1f1da31ddbca67c5b6301ac8b255Chris Lattner return true; 2000946ccd1e58c1f1da31ddbca67c5b6301ac8b255Chris Lattner 2010946ccd1e58c1f1da31ddbca67c5b6301ac8b255Chris Lattner return false; 2020946ccd1e58c1f1da31ddbca67c5b6301ac8b255Chris Lattner} 2030946ccd1e58c1f1da31ddbca67c5b6301ac8b255Chris Lattner 20431a0984b5cb4af99d2407c0f25bf5af68df681c6Chris Lattner 20531a0984b5cb4af99d2407c0f25bf5af68df681c6Chris Lattner/// ConstantFoldsToSimpleInteger - If the sepcified expression does not fold to 20631a0984b5cb4af99d2407c0f25bf5af68df681c6Chris Lattner/// a constant, or if it does but contains a label, return 0. If it constant 20731a0984b5cb4af99d2407c0f25bf5af68df681c6Chris Lattner/// folds to 'true' and does not contain a label, return 1, if it constant folds 20831a0984b5cb4af99d2407c0f25bf5af68df681c6Chris Lattner/// to 'false' and does not contain a label, return -1. 20931a0984b5cb4af99d2407c0f25bf5af68df681c6Chris Lattnerint CodeGenFunction::ConstantFoldsToSimpleInteger(const Expr *Cond) { 21036bc14c3a1cf63ee306df5687ac8e85f924f8639Daniel Dunbar // FIXME: Rename and handle conversion of other evaluatable things 21136bc14c3a1cf63ee306df5687ac8e85f924f8639Daniel Dunbar // to bool. 21264712f196bffd41fb0552c2643b07a25c3e45082Anders Carlsson Expr::EvalResult Result; 21364712f196bffd41fb0552c2643b07a25c3e45082Anders Carlsson if (!Cond->Evaluate(Result, getContext()) || !Result.Val.isInt() || 21464712f196bffd41fb0552c2643b07a25c3e45082Anders Carlsson Result.HasSideEffects) 215ef5a66d8171eb95e948107f8ee7707b360aaff25Anders Carlsson return 0; // Not foldable, not integer or not fully evaluatable. 21631a0984b5cb4af99d2407c0f25bf5af68df681c6Chris Lattner 21731a0984b5cb4af99d2407c0f25bf5af68df681c6Chris Lattner if (CodeGenFunction::ContainsLabel(Cond)) 21831a0984b5cb4af99d2407c0f25bf5af68df681c6Chris Lattner return 0; // Contains a label. 21931a0984b5cb4af99d2407c0f25bf5af68df681c6Chris Lattner 22064712f196bffd41fb0552c2643b07a25c3e45082Anders Carlsson return Result.Val.getInt().getBoolValue() ? 1 : -1; 22131a0984b5cb4af99d2407c0f25bf5af68df681c6Chris Lattner} 22231a0984b5cb4af99d2407c0f25bf5af68df681c6Chris Lattner 22331a0984b5cb4af99d2407c0f25bf5af68df681c6Chris Lattner 22431a0984b5cb4af99d2407c0f25bf5af68df681c6Chris Lattner/// EmitBranchOnBoolExpr - Emit a branch on a boolean condition (e.g. for an if 22531a0984b5cb4af99d2407c0f25bf5af68df681c6Chris Lattner/// statement) to the specified blocks. Based on the condition, this might try 22631a0984b5cb4af99d2407c0f25bf5af68df681c6Chris Lattner/// to simplify the codegen of the conditional based on the branch. 22731a0984b5cb4af99d2407c0f25bf5af68df681c6Chris Lattner/// 22831a0984b5cb4af99d2407c0f25bf5af68df681c6Chris Lattnervoid CodeGenFunction::EmitBranchOnBoolExpr(const Expr *Cond, 22931a0984b5cb4af99d2407c0f25bf5af68df681c6Chris Lattner llvm::BasicBlock *TrueBlock, 23031a0984b5cb4af99d2407c0f25bf5af68df681c6Chris Lattner llvm::BasicBlock *FalseBlock) { 23131a0984b5cb4af99d2407c0f25bf5af68df681c6Chris Lattner if (const ParenExpr *PE = dyn_cast<ParenExpr>(Cond)) 23231a0984b5cb4af99d2407c0f25bf5af68df681c6Chris Lattner return EmitBranchOnBoolExpr(PE->getSubExpr(), TrueBlock, FalseBlock); 23331a0984b5cb4af99d2407c0f25bf5af68df681c6Chris Lattner 23431a0984b5cb4af99d2407c0f25bf5af68df681c6Chris Lattner if (const BinaryOperator *CondBOp = dyn_cast<BinaryOperator>(Cond)) { 23531a0984b5cb4af99d2407c0f25bf5af68df681c6Chris Lattner // Handle X && Y in a condition. 23631a0984b5cb4af99d2407c0f25bf5af68df681c6Chris Lattner if (CondBOp->getOpcode() == BinaryOperator::LAnd) { 23731a0984b5cb4af99d2407c0f25bf5af68df681c6Chris Lattner // If we have "1 && X", simplify the code. "0 && X" would have constant 23831a0984b5cb4af99d2407c0f25bf5af68df681c6Chris Lattner // folded if the case was simple enough. 23931a0984b5cb4af99d2407c0f25bf5af68df681c6Chris Lattner if (ConstantFoldsToSimpleInteger(CondBOp->getLHS()) == 1) { 24031a0984b5cb4af99d2407c0f25bf5af68df681c6Chris Lattner // br(1 && X) -> br(X). 24131a0984b5cb4af99d2407c0f25bf5af68df681c6Chris Lattner return EmitBranchOnBoolExpr(CondBOp->getRHS(), TrueBlock, FalseBlock); 24231a0984b5cb4af99d2407c0f25bf5af68df681c6Chris Lattner } 24331a0984b5cb4af99d2407c0f25bf5af68df681c6Chris Lattner 24431a0984b5cb4af99d2407c0f25bf5af68df681c6Chris Lattner // If we have "X && 1", simplify the code to use an uncond branch. 24531a0984b5cb4af99d2407c0f25bf5af68df681c6Chris Lattner // "X && 0" would have been constant folded to 0. 24631a0984b5cb4af99d2407c0f25bf5af68df681c6Chris Lattner if (ConstantFoldsToSimpleInteger(CondBOp->getRHS()) == 1) { 24731a0984b5cb4af99d2407c0f25bf5af68df681c6Chris Lattner // br(X && 1) -> br(X). 24831a0984b5cb4af99d2407c0f25bf5af68df681c6Chris Lattner return EmitBranchOnBoolExpr(CondBOp->getLHS(), TrueBlock, FalseBlock); 24931a0984b5cb4af99d2407c0f25bf5af68df681c6Chris Lattner } 25031a0984b5cb4af99d2407c0f25bf5af68df681c6Chris Lattner 25131a0984b5cb4af99d2407c0f25bf5af68df681c6Chris Lattner // Emit the LHS as a conditional. If the LHS conditional is false, we 25231a0984b5cb4af99d2407c0f25bf5af68df681c6Chris Lattner // want to jump to the FalseBlock. 2539615ecb44f549ae9fa2b4db6ff46bc78befbf62cDaniel Dunbar llvm::BasicBlock *LHSTrue = createBasicBlock("land.lhs.true"); 25431a0984b5cb4af99d2407c0f25bf5af68df681c6Chris Lattner EmitBranchOnBoolExpr(CondBOp->getLHS(), LHSTrue, FalseBlock); 25531a0984b5cb4af99d2407c0f25bf5af68df681c6Chris Lattner EmitBlock(LHSTrue); 25631a0984b5cb4af99d2407c0f25bf5af68df681c6Chris Lattner 25731a0984b5cb4af99d2407c0f25bf5af68df681c6Chris Lattner EmitBranchOnBoolExpr(CondBOp->getRHS(), TrueBlock, FalseBlock); 25831a0984b5cb4af99d2407c0f25bf5af68df681c6Chris Lattner return; 25931a0984b5cb4af99d2407c0f25bf5af68df681c6Chris Lattner } else if (CondBOp->getOpcode() == BinaryOperator::LOr) { 26031a0984b5cb4af99d2407c0f25bf5af68df681c6Chris Lattner // If we have "0 || X", simplify the code. "1 || X" would have constant 26131a0984b5cb4af99d2407c0f25bf5af68df681c6Chris Lattner // folded if the case was simple enough. 26231a0984b5cb4af99d2407c0f25bf5af68df681c6Chris Lattner if (ConstantFoldsToSimpleInteger(CondBOp->getLHS()) == -1) { 26331a0984b5cb4af99d2407c0f25bf5af68df681c6Chris Lattner // br(0 || X) -> br(X). 26431a0984b5cb4af99d2407c0f25bf5af68df681c6Chris Lattner return EmitBranchOnBoolExpr(CondBOp->getRHS(), TrueBlock, FalseBlock); 26531a0984b5cb4af99d2407c0f25bf5af68df681c6Chris Lattner } 26631a0984b5cb4af99d2407c0f25bf5af68df681c6Chris Lattner 26731a0984b5cb4af99d2407c0f25bf5af68df681c6Chris Lattner // If we have "X || 0", simplify the code to use an uncond branch. 26831a0984b5cb4af99d2407c0f25bf5af68df681c6Chris Lattner // "X || 1" would have been constant folded to 1. 26931a0984b5cb4af99d2407c0f25bf5af68df681c6Chris Lattner if (ConstantFoldsToSimpleInteger(CondBOp->getRHS()) == -1) { 27031a0984b5cb4af99d2407c0f25bf5af68df681c6Chris Lattner // br(X || 0) -> br(X). 27131a0984b5cb4af99d2407c0f25bf5af68df681c6Chris Lattner return EmitBranchOnBoolExpr(CondBOp->getLHS(), TrueBlock, FalseBlock); 27231a0984b5cb4af99d2407c0f25bf5af68df681c6Chris Lattner } 27331a0984b5cb4af99d2407c0f25bf5af68df681c6Chris Lattner 27431a0984b5cb4af99d2407c0f25bf5af68df681c6Chris Lattner // Emit the LHS as a conditional. If the LHS conditional is true, we 27531a0984b5cb4af99d2407c0f25bf5af68df681c6Chris Lattner // want to jump to the TrueBlock. 2769615ecb44f549ae9fa2b4db6ff46bc78befbf62cDaniel Dunbar llvm::BasicBlock *LHSFalse = createBasicBlock("lor.lhs.false"); 27731a0984b5cb4af99d2407c0f25bf5af68df681c6Chris Lattner EmitBranchOnBoolExpr(CondBOp->getLHS(), TrueBlock, LHSFalse); 27831a0984b5cb4af99d2407c0f25bf5af68df681c6Chris Lattner EmitBlock(LHSFalse); 27931a0984b5cb4af99d2407c0f25bf5af68df681c6Chris Lattner 28031a0984b5cb4af99d2407c0f25bf5af68df681c6Chris Lattner EmitBranchOnBoolExpr(CondBOp->getRHS(), TrueBlock, FalseBlock); 28131a0984b5cb4af99d2407c0f25bf5af68df681c6Chris Lattner return; 28231a0984b5cb4af99d2407c0f25bf5af68df681c6Chris Lattner } 283552f4c45ba4f4a01f86d585edabd871a27829867Chris Lattner } 284552f4c45ba4f4a01f86d585edabd871a27829867Chris Lattner 285552f4c45ba4f4a01f86d585edabd871a27829867Chris Lattner if (const UnaryOperator *CondUOp = dyn_cast<UnaryOperator>(Cond)) { 286552f4c45ba4f4a01f86d585edabd871a27829867Chris Lattner // br(!x, t, f) -> br(x, f, t) 287552f4c45ba4f4a01f86d585edabd871a27829867Chris Lattner if (CondUOp->getOpcode() == UnaryOperator::LNot) 288552f4c45ba4f4a01f86d585edabd871a27829867Chris Lattner return EmitBranchOnBoolExpr(CondUOp->getSubExpr(), FalseBlock, TrueBlock); 28931a0984b5cb4af99d2407c0f25bf5af68df681c6Chris Lattner } 29031a0984b5cb4af99d2407c0f25bf5af68df681c6Chris Lattner 29109b14899039d828094c06ac25d60de62608e57b7Daniel Dunbar if (const ConditionalOperator *CondOp = dyn_cast<ConditionalOperator>(Cond)) { 29209b14899039d828094c06ac25d60de62608e57b7Daniel Dunbar // Handle ?: operator. 29309b14899039d828094c06ac25d60de62608e57b7Daniel Dunbar 29409b14899039d828094c06ac25d60de62608e57b7Daniel Dunbar // Just ignore GNU ?: extension. 29509b14899039d828094c06ac25d60de62608e57b7Daniel Dunbar if (CondOp->getLHS()) { 29609b14899039d828094c06ac25d60de62608e57b7Daniel Dunbar // br(c ? x : y, t, f) -> br(c, br(x, t, f), br(y, t, f)) 29709b14899039d828094c06ac25d60de62608e57b7Daniel Dunbar llvm::BasicBlock *LHSBlock = createBasicBlock("cond.true"); 29809b14899039d828094c06ac25d60de62608e57b7Daniel Dunbar llvm::BasicBlock *RHSBlock = createBasicBlock("cond.false"); 29909b14899039d828094c06ac25d60de62608e57b7Daniel Dunbar EmitBranchOnBoolExpr(CondOp->getCond(), LHSBlock, RHSBlock); 30009b14899039d828094c06ac25d60de62608e57b7Daniel Dunbar EmitBlock(LHSBlock); 30109b14899039d828094c06ac25d60de62608e57b7Daniel Dunbar EmitBranchOnBoolExpr(CondOp->getLHS(), TrueBlock, FalseBlock); 30209b14899039d828094c06ac25d60de62608e57b7Daniel Dunbar EmitBlock(RHSBlock); 30309b14899039d828094c06ac25d60de62608e57b7Daniel Dunbar EmitBranchOnBoolExpr(CondOp->getRHS(), TrueBlock, FalseBlock); 30409b14899039d828094c06ac25d60de62608e57b7Daniel Dunbar return; 30509b14899039d828094c06ac25d60de62608e57b7Daniel Dunbar } 30609b14899039d828094c06ac25d60de62608e57b7Daniel Dunbar } 30709b14899039d828094c06ac25d60de62608e57b7Daniel Dunbar 30831a0984b5cb4af99d2407c0f25bf5af68df681c6Chris Lattner // Emit the code with the fully general case. 30931a0984b5cb4af99d2407c0f25bf5af68df681c6Chris Lattner llvm::Value *CondV = EvaluateExprAsBool(Cond); 31031a0984b5cb4af99d2407c0f25bf5af68df681c6Chris Lattner Builder.CreateCondBr(CondV, TrueBlock, FalseBlock); 31131a0984b5cb4af99d2407c0f25bf5af68df681c6Chris Lattner} 31231a0984b5cb4af99d2407c0f25bf5af68df681c6Chris Lattner 31388a981b47c7face1b1fdaa9074256245107b9ca9Devang Patel/// getCGRecordLayout - Return record layout info. 31488a981b47c7face1b1fdaa9074256245107b9ca9Devang Patelconst CGRecordLayout *CodeGenFunction::getCGRecordLayout(CodeGenTypes &CGT, 315af31913e48c96fddb45a0fd33f25617546502cbbChris Lattner QualType Ty) { 316af31913e48c96fddb45a0fd33f25617546502cbbChris Lattner const RecordType *RTy = Ty->getAsRecordType(); 317af31913e48c96fddb45a0fd33f25617546502cbbChris Lattner assert (RTy && "Unexpected type. RecordType expected here."); 318b84a06e68ffd71da22e3c75b6e4bbdba37816413Devang Patel 319af31913e48c96fddb45a0fd33f25617546502cbbChris Lattner return CGT.getCGRecordLayout(RTy->getDecl()); 320b84a06e68ffd71da22e3c75b6e4bbdba37816413Devang Patel} 321dc5e8268292046114ffe02e48773572a91a310f1Chris Lattner 322488e993a135ce700b982bf099c3d6b856301d642Daniel Dunbar/// ErrorUnsupported - Print out an error that codegen doesn't support the 323dc5e8268292046114ffe02e48773572a91a310f1Chris Lattner/// specified stmt yet. 32490df4b6661968a84bf64baee489bb2f6d948fcc1Daniel Dunbarvoid CodeGenFunction::ErrorUnsupported(const Stmt *S, const char *Type, 32590df4b6661968a84bf64baee489bb2f6d948fcc1Daniel Dunbar bool OmitOnError) { 32690df4b6661968a84bf64baee489bb2f6d948fcc1Daniel Dunbar CGM.ErrorUnsupported(S, Type, OmitOnError); 327dc5e8268292046114ffe02e48773572a91a310f1Chris Lattner} 328dc5e8268292046114ffe02e48773572a91a310f1Chris Lattner 3290ffb125996336fc7602b162c0a9e392f1a93060fDaniel Dunbarunsigned CodeGenFunction::GetIDForAddrOfLabel(const LabelStmt *L) { 3300ffb125996336fc7602b162c0a9e392f1a93060fDaniel Dunbar // Use LabelIDs.size() as the new ID if one hasn't been assigned. 3310ffb125996336fc7602b162c0a9e392f1a93060fDaniel Dunbar return LabelIDs.insert(std::make_pair(L, LabelIDs.size())).first->second; 3320ffb125996336fc7602b162c0a9e392f1a93060fDaniel Dunbar} 3330ffb125996336fc7602b162c0a9e392f1a93060fDaniel Dunbar 3343d8400d9a61aa4b63ff35e5cede405b32a41425eAnders Carlssonvoid CodeGenFunction::EmitMemSetToZero(llvm::Value *DestPtr, QualType Ty) 3353d8400d9a61aa4b63ff35e5cede405b32a41425eAnders Carlsson{ 3363d8400d9a61aa4b63ff35e5cede405b32a41425eAnders Carlsson const llvm::Type *BP = llvm::PointerType::getUnqual(llvm::Type::Int8Ty); 3373d8400d9a61aa4b63ff35e5cede405b32a41425eAnders Carlsson if (DestPtr->getType() != BP) 3383d8400d9a61aa4b63ff35e5cede405b32a41425eAnders Carlsson DestPtr = Builder.CreateBitCast(DestPtr, BP, "tmp"); 3393d8400d9a61aa4b63ff35e5cede405b32a41425eAnders Carlsson 3403d8400d9a61aa4b63ff35e5cede405b32a41425eAnders Carlsson // Get size and alignment info for this aggregate. 3413d8400d9a61aa4b63ff35e5cede405b32a41425eAnders Carlsson std::pair<uint64_t, unsigned> TypeInfo = getContext().getTypeInfo(Ty); 3423d8400d9a61aa4b63ff35e5cede405b32a41425eAnders Carlsson 3433d8400d9a61aa4b63ff35e5cede405b32a41425eAnders Carlsson // FIXME: Handle variable sized types. 3443d8400d9a61aa4b63ff35e5cede405b32a41425eAnders Carlsson const llvm::Type *IntPtr = llvm::IntegerType::get(LLVMPointerWidth); 3453d8400d9a61aa4b63ff35e5cede405b32a41425eAnders Carlsson 3463d8400d9a61aa4b63ff35e5cede405b32a41425eAnders Carlsson Builder.CreateCall4(CGM.getMemSetFn(), DestPtr, 3473d8400d9a61aa4b63ff35e5cede405b32a41425eAnders Carlsson llvm::ConstantInt::getNullValue(llvm::Type::Int8Ty), 3483d8400d9a61aa4b63ff35e5cede405b32a41425eAnders Carlsson // TypeInfo.first describes size in bits. 3493d8400d9a61aa4b63ff35e5cede405b32a41425eAnders Carlsson llvm::ConstantInt::get(IntPtr, TypeInfo.first/8), 3503d8400d9a61aa4b63ff35e5cede405b32a41425eAnders Carlsson llvm::ConstantInt::get(llvm::Type::Int32Ty, 3513d8400d9a61aa4b63ff35e5cede405b32a41425eAnders Carlsson TypeInfo.second/8)); 3523d8400d9a61aa4b63ff35e5cede405b32a41425eAnders Carlsson} 3533d8400d9a61aa4b63ff35e5cede405b32a41425eAnders Carlsson 3540ffb125996336fc7602b162c0a9e392f1a93060fDaniel Dunbarvoid CodeGenFunction::EmitIndirectSwitches() { 3550ffb125996336fc7602b162c0a9e392f1a93060fDaniel Dunbar llvm::BasicBlock *Default; 3560ffb125996336fc7602b162c0a9e392f1a93060fDaniel Dunbar 35776526a5245ec2283b0c85fcef507d4c2dec90715Daniel Dunbar if (IndirectSwitches.empty()) 35876526a5245ec2283b0c85fcef507d4c2dec90715Daniel Dunbar return; 35976526a5245ec2283b0c85fcef507d4c2dec90715Daniel Dunbar 3600ffb125996336fc7602b162c0a9e392f1a93060fDaniel Dunbar if (!LabelIDs.empty()) { 3610ffb125996336fc7602b162c0a9e392f1a93060fDaniel Dunbar Default = getBasicBlockForLabel(LabelIDs.begin()->first); 3620ffb125996336fc7602b162c0a9e392f1a93060fDaniel Dunbar } else { 3630ffb125996336fc7602b162c0a9e392f1a93060fDaniel Dunbar // No possible targets for indirect goto, just emit an infinite 3640ffb125996336fc7602b162c0a9e392f1a93060fDaniel Dunbar // loop. 36555e874299f2ad827646a4ca9ea38c402aaeb38c9Daniel Dunbar Default = createBasicBlock("indirectgoto.loop", CurFn); 3660ffb125996336fc7602b162c0a9e392f1a93060fDaniel Dunbar llvm::BranchInst::Create(Default, Default); 3670ffb125996336fc7602b162c0a9e392f1a93060fDaniel Dunbar } 3680ffb125996336fc7602b162c0a9e392f1a93060fDaniel Dunbar 3690ffb125996336fc7602b162c0a9e392f1a93060fDaniel Dunbar for (std::vector<llvm::SwitchInst*>::iterator i = IndirectSwitches.begin(), 3700ffb125996336fc7602b162c0a9e392f1a93060fDaniel Dunbar e = IndirectSwitches.end(); i != e; ++i) { 3710ffb125996336fc7602b162c0a9e392f1a93060fDaniel Dunbar llvm::SwitchInst *I = *i; 3720ffb125996336fc7602b162c0a9e392f1a93060fDaniel Dunbar 3730ffb125996336fc7602b162c0a9e392f1a93060fDaniel Dunbar I->setSuccessor(0, Default); 3740ffb125996336fc7602b162c0a9e392f1a93060fDaniel Dunbar for (std::map<const LabelStmt*,unsigned>::iterator LI = LabelIDs.begin(), 3750ffb125996336fc7602b162c0a9e392f1a93060fDaniel Dunbar LE = LabelIDs.end(); LI != LE; ++LI) { 3760ffb125996336fc7602b162c0a9e392f1a93060fDaniel Dunbar I->addCase(llvm::ConstantInt::get(llvm::Type::Int32Ty, 3770ffb125996336fc7602b162c0a9e392f1a93060fDaniel Dunbar LI->second), 3780ffb125996336fc7602b162c0a9e392f1a93060fDaniel Dunbar getBasicBlockForLabel(LI->first)); 3790ffb125996336fc7602b162c0a9e392f1a93060fDaniel Dunbar } 3800ffb125996336fc7602b162c0a9e392f1a93060fDaniel Dunbar } 3810ffb125996336fc7602b162c0a9e392f1a93060fDaniel Dunbar} 382ddf7cac45d85b73127adbbd91a2b28fc7291c57eAnders Carlsson 383ddf7cac45d85b73127adbbd91a2b28fc7291c57eAnders Carlssonllvm::Value *CodeGenFunction::EmitVAArg(llvm::Value *VAListAddr, QualType Ty) 384ddf7cac45d85b73127adbbd91a2b28fc7291c57eAnders Carlsson{ 385ddf7cac45d85b73127adbbd91a2b28fc7291c57eAnders Carlsson // FIXME: This entire method is hardcoded for 32-bit X86. 386ddf7cac45d85b73127adbbd91a2b28fc7291c57eAnders Carlsson 387ddf7cac45d85b73127adbbd91a2b28fc7291c57eAnders Carlsson const char *TargetPrefix = getContext().Target.getTargetPrefix(); 388ddf7cac45d85b73127adbbd91a2b28fc7291c57eAnders Carlsson 389ddf7cac45d85b73127adbbd91a2b28fc7291c57eAnders Carlsson if (strcmp(TargetPrefix, "x86") != 0 || 390ddf7cac45d85b73127adbbd91a2b28fc7291c57eAnders Carlsson getContext().Target.getPointerWidth(0) != 32) 391ddf7cac45d85b73127adbbd91a2b28fc7291c57eAnders Carlsson return 0; 392ddf7cac45d85b73127adbbd91a2b28fc7291c57eAnders Carlsson 393ddf7cac45d85b73127adbbd91a2b28fc7291c57eAnders Carlsson const llvm::Type *BP = llvm::PointerType::getUnqual(llvm::Type::Int8Ty); 394ddf7cac45d85b73127adbbd91a2b28fc7291c57eAnders Carlsson const llvm::Type *BPP = llvm::PointerType::getUnqual(BP); 395ddf7cac45d85b73127adbbd91a2b28fc7291c57eAnders Carlsson 396ddf7cac45d85b73127adbbd91a2b28fc7291c57eAnders Carlsson llvm::Value *VAListAddrAsBPP = Builder.CreateBitCast(VAListAddr, BPP, 397ddf7cac45d85b73127adbbd91a2b28fc7291c57eAnders Carlsson "ap"); 398ddf7cac45d85b73127adbbd91a2b28fc7291c57eAnders Carlsson llvm::Value *Addr = Builder.CreateLoad(VAListAddrAsBPP, "ap.cur"); 399ddf7cac45d85b73127adbbd91a2b28fc7291c57eAnders Carlsson llvm::Value *AddrTyped = 400ddf7cac45d85b73127adbbd91a2b28fc7291c57eAnders Carlsson Builder.CreateBitCast(Addr, 401ddf7cac45d85b73127adbbd91a2b28fc7291c57eAnders Carlsson llvm::PointerType::getUnqual(ConvertType(Ty))); 402ddf7cac45d85b73127adbbd91a2b28fc7291c57eAnders Carlsson 403ddf7cac45d85b73127adbbd91a2b28fc7291c57eAnders Carlsson uint64_t SizeInBytes = getContext().getTypeSize(Ty) / 8; 404ddf7cac45d85b73127adbbd91a2b28fc7291c57eAnders Carlsson const unsigned ArgumentSizeInBytes = 4; 405ddf7cac45d85b73127adbbd91a2b28fc7291c57eAnders Carlsson if (SizeInBytes < ArgumentSizeInBytes) 406ddf7cac45d85b73127adbbd91a2b28fc7291c57eAnders Carlsson SizeInBytes = ArgumentSizeInBytes; 407ddf7cac45d85b73127adbbd91a2b28fc7291c57eAnders Carlsson 408ddf7cac45d85b73127adbbd91a2b28fc7291c57eAnders Carlsson llvm::Value *NextAddr = 409ddf7cac45d85b73127adbbd91a2b28fc7291c57eAnders Carlsson Builder.CreateGEP(Addr, 410ddf7cac45d85b73127adbbd91a2b28fc7291c57eAnders Carlsson llvm::ConstantInt::get(llvm::Type::Int32Ty, SizeInBytes), 411ddf7cac45d85b73127adbbd91a2b28fc7291c57eAnders Carlsson "ap.next"); 412ddf7cac45d85b73127adbbd91a2b28fc7291c57eAnders Carlsson Builder.CreateStore(NextAddr, VAListAddrAsBPP); 413ddf7cac45d85b73127adbbd91a2b28fc7291c57eAnders Carlsson 414ddf7cac45d85b73127adbbd91a2b28fc7291c57eAnders Carlsson return AddrTyped; 415ddf7cac45d85b73127adbbd91a2b28fc7291c57eAnders Carlsson} 416ddf7cac45d85b73127adbbd91a2b28fc7291c57eAnders Carlsson 417f666b7780d04186521adcaedb0e15dfa4d5e6933Anders Carlsson 418dcc90d87e6430c643b4311ae5b0089535bca41f7Anders Carlssonllvm::Value *CodeGenFunction::GetVLASize(const VariableArrayType *VAT) 419dcc90d87e6430c643b4311ae5b0089535bca41f7Anders Carlsson{ 420dcc90d87e6430c643b4311ae5b0089535bca41f7Anders Carlsson llvm::Value *&SizeEntry = VLASizeMap[VAT]; 421dcc90d87e6430c643b4311ae5b0089535bca41f7Anders Carlsson 422f666b7780d04186521adcaedb0e15dfa4d5e6933Anders Carlsson assert(SizeEntry && "Did not emit size for type"); 423f666b7780d04186521adcaedb0e15dfa4d5e6933Anders Carlsson return SizeEntry; 424f666b7780d04186521adcaedb0e15dfa4d5e6933Anders Carlsson} 425dcc90d87e6430c643b4311ae5b0089535bca41f7Anders Carlsson 42660d35413662ebdcd1d31e34a8a7c665eb6977f1eAnders Carlssonllvm::Value *CodeGenFunction::EmitVLASize(QualType Ty) 427f666b7780d04186521adcaedb0e15dfa4d5e6933Anders Carlsson{ 42860d35413662ebdcd1d31e34a8a7c665eb6977f1eAnders Carlsson assert(Ty->isVariablyModifiedType() && 42960d35413662ebdcd1d31e34a8a7c665eb6977f1eAnders Carlsson "Must pass variably modified type to EmitVLASizes!"); 430f666b7780d04186521adcaedb0e15dfa4d5e6933Anders Carlsson 43160d35413662ebdcd1d31e34a8a7c665eb6977f1eAnders Carlsson if (const VariableArrayType *VAT = getContext().getAsVariableArrayType(Ty)) { 43260d35413662ebdcd1d31e34a8a7c665eb6977f1eAnders Carlsson llvm::Value *&SizeEntry = VLASizeMap[VAT]; 43360d35413662ebdcd1d31e34a8a7c665eb6977f1eAnders Carlsson 434fcdbb93749ed69aa9022437052c390522355ec3dAnders Carlsson if (!SizeEntry) { 435fcdbb93749ed69aa9022437052c390522355ec3dAnders Carlsson // Get the element size; 436fcdbb93749ed69aa9022437052c390522355ec3dAnders Carlsson llvm::Value *ElemSize; 43760d35413662ebdcd1d31e34a8a7c665eb6977f1eAnders Carlsson 438fcdbb93749ed69aa9022437052c390522355ec3dAnders Carlsson QualType ElemTy = VAT->getElementType(); 43960d35413662ebdcd1d31e34a8a7c665eb6977f1eAnders Carlsson 440fcdbb93749ed69aa9022437052c390522355ec3dAnders Carlsson if (ElemTy->isVariableArrayType()) 441fcdbb93749ed69aa9022437052c390522355ec3dAnders Carlsson ElemSize = EmitVLASize(ElemTy); 442fcdbb93749ed69aa9022437052c390522355ec3dAnders Carlsson else { 443fcdbb93749ed69aa9022437052c390522355ec3dAnders Carlsson // FIXME: We use Int32Ty here because the alloca instruction takes a 444fcdbb93749ed69aa9022437052c390522355ec3dAnders Carlsson // 32-bit integer. What should we do about overflow? 445fcdbb93749ed69aa9022437052c390522355ec3dAnders Carlsson ElemSize = llvm::ConstantInt::get(llvm::Type::Int32Ty, 446fcdbb93749ed69aa9022437052c390522355ec3dAnders Carlsson getContext().getTypeSize(ElemTy) / 8); 447fcdbb93749ed69aa9022437052c390522355ec3dAnders Carlsson } 44860d35413662ebdcd1d31e34a8a7c665eb6977f1eAnders Carlsson 449fcdbb93749ed69aa9022437052c390522355ec3dAnders Carlsson llvm::Value *NumElements = EmitScalarExpr(VAT->getSizeExpr()); 45060d35413662ebdcd1d31e34a8a7c665eb6977f1eAnders Carlsson 451fcdbb93749ed69aa9022437052c390522355ec3dAnders Carlsson SizeEntry = Builder.CreateMul(ElemSize, NumElements); 452fcdbb93749ed69aa9022437052c390522355ec3dAnders Carlsson } 45360d35413662ebdcd1d31e34a8a7c665eb6977f1eAnders Carlsson 45460d35413662ebdcd1d31e34a8a7c665eb6977f1eAnders Carlsson return SizeEntry; 45560d35413662ebdcd1d31e34a8a7c665eb6977f1eAnders Carlsson } else if (const PointerType *PT = Ty->getAsPointerType()) 45660d35413662ebdcd1d31e34a8a7c665eb6977f1eAnders Carlsson EmitVLASize(PT->getPointeeType()); 457f666b7780d04186521adcaedb0e15dfa4d5e6933Anders Carlsson else { 45860d35413662ebdcd1d31e34a8a7c665eb6977f1eAnders Carlsson assert(0 && "unknown VM type!"); 459dcc90d87e6430c643b4311ae5b0089535bca41f7Anders Carlsson } 46060d35413662ebdcd1d31e34a8a7c665eb6977f1eAnders Carlsson 46160d35413662ebdcd1d31e34a8a7c665eb6977f1eAnders Carlsson return 0; 462dcc90d87e6430c643b4311ae5b0089535bca41f7Anders Carlsson} 463