head 1.1; branch 1.1.1; access; symbols netbsd-11-0-RC6:1.1.1.12 netbsd-11-0-RC5:1.1.1.12 netbsd-11-0-RC4:1.1.1.12 netbsd-11-0-RC3:1.1.1.12 netbsd-11-0-RC2:1.1.1.12 netbsd-11-0-RC1:1.1.1.12 perseant-exfatfs-base-20250801:1.1.1.12 netbsd-11:1.1.1.12.0.10 netbsd-11-base:1.1.1.12 netbsd-10-1-RELEASE:1.1.1.12 perseant-exfatfs-base-20240630:1.1.1.12 perseant-exfatfs:1.1.1.12.0.8 perseant-exfatfs-base:1.1.1.12 netbsd-8-3-RELEASE:1.1.1.9 netbsd-9-4-RELEASE:1.1.1.11 netbsd-10-0-RELEASE:1.1.1.12 netbsd-10-0-RC6:1.1.1.12 netbsd-10-0-RC5:1.1.1.12 netbsd-10-0-RC4:1.1.1.12 netbsd-10-0-RC3:1.1.1.12 netbsd-10-0-RC2:1.1.1.12 netbsd-10-0-RC1:1.1.1.12 netbsd-10:1.1.1.12.0.6 netbsd-10-base:1.1.1.12 netbsd-9-3-RELEASE:1.1.1.11 cjep_sun2x:1.1.1.12.0.4 cjep_sun2x-base:1.1.1.12 cjep_staticlib_x-base1:1.1.1.12 netbsd-9-2-RELEASE:1.1.1.11 cjep_staticlib_x:1.1.1.12.0.2 cjep_staticlib_x-base:1.1.1.12 netbsd-9-1-RELEASE:1.1.1.11 phil-wifi-20200421:1.1.1.12 phil-wifi-20200411:1.1.1.12 phil-wifi-20200406:1.1.1.12 netbsd-8-2-RELEASE:1.1.1.9 netbsd-9-0-RELEASE:1.1.1.11 netbsd-9-0-RC2:1.1.1.11 netbsd-9-0-RC1:1.1.1.11 netbsd-9:1.1.1.11.0.2 netbsd-9-base:1.1.1.11 phil-wifi-20190609:1.1.1.11 netbsd-8-1-RELEASE:1.1.1.9 netbsd-8-1-RC1:1.1.1.9 pgoyette-compat-merge-20190127:1.1.1.10.2.1 pgoyette-compat-20190127:1.1.1.11 pgoyette-compat-20190118:1.1.1.11 pgoyette-compat-1226:1.1.1.11 pgoyette-compat-1126:1.1.1.11 pgoyette-compat-1020:1.1.1.11 pgoyette-compat-0930:1.1.1.11 pgoyette-compat-0906:1.1.1.11 netbsd-7-2-RELEASE:1.1.1.5.2.1 pgoyette-compat-0728:1.1.1.11 clang-337282:1.1.1.11 netbsd-8-0-RELEASE:1.1.1.9 phil-wifi:1.1.1.10.0.4 phil-wifi-base:1.1.1.10 pgoyette-compat-0625:1.1.1.10 netbsd-8-0-RC2:1.1.1.9 pgoyette-compat-0521:1.1.1.10 pgoyette-compat-0502:1.1.1.10 pgoyette-compat-0422:1.1.1.10 netbsd-8-0-RC1:1.1.1.9 pgoyette-compat-0415:1.1.1.10 pgoyette-compat-0407:1.1.1.10 pgoyette-compat-0330:1.1.1.10 pgoyette-compat-0322:1.1.1.10 pgoyette-compat-0315:1.1.1.10 netbsd-7-1-2-RELEASE:1.1.1.5.2.1 pgoyette-compat:1.1.1.10.0.2 pgoyette-compat-base:1.1.1.10 netbsd-7-1-1-RELEASE:1.1.1.5.2.1 clang-319952:1.1.1.10 matt-nb8-mediatek:1.1.1.9.0.8 matt-nb8-mediatek-base:1.1.1.9 clang-309604:1.1.1.10 perseant-stdc-iso10646:1.1.1.9.0.6 perseant-stdc-iso10646-base:1.1.1.9 netbsd-8:1.1.1.9.0.4 netbsd-8-base:1.1.1.9 prg-localcount2-base3:1.1.1.9 prg-localcount2-base2:1.1.1.9 prg-localcount2-base1:1.1.1.9 prg-localcount2:1.1.1.9.0.2 prg-localcount2-base:1.1.1.9 pgoyette-localcount-20170426:1.1.1.9 bouyer-socketcan-base1:1.1.1.9 pgoyette-localcount-20170320:1.1.1.9 netbsd-7-1:1.1.1.5.2.1.0.6 netbsd-7-1-RELEASE:1.1.1.5.2.1 netbsd-7-1-RC2:1.1.1.5.2.1 clang-294123:1.1.1.9 netbsd-7-nhusb-base-20170116:1.1.1.5.2.1 bouyer-socketcan:1.1.1.8.0.2 bouyer-socketcan-base:1.1.1.8 clang-291444:1.1.1.8 pgoyette-localcount-20170107:1.1.1.7 netbsd-7-1-RC1:1.1.1.5.2.1 pgoyette-localcount-20161104:1.1.1.7 netbsd-7-0-2-RELEASE:1.1.1.5.2.1 localcount-20160914:1.1.1.7 netbsd-7-nhusb:1.1.1.5.2.1.0.4 netbsd-7-nhusb-base:1.1.1.5.2.1 clang-280599:1.1.1.7 pgoyette-localcount-20160806:1.1.1.7 pgoyette-localcount-20160726:1.1.1.7 pgoyette-localcount:1.1.1.7.0.2 pgoyette-localcount-base:1.1.1.7 netbsd-7-0-1-RELEASE:1.1.1.5.2.1 clang-261930:1.1.1.7 netbsd-7-0:1.1.1.5.2.1.0.2 netbsd-7-0-RELEASE:1.1.1.5.2.1 netbsd-7-0-RC3:1.1.1.5.2.1 netbsd-7-0-RC2:1.1.1.5.2.1 netbsd-7-0-RC1:1.1.1.5.2.1 clang-237755:1.1.1.6 clang-232565:1.1.1.6 clang-227398:1.1.1.6 tls-maxphys-base:1.1.1.5 tls-maxphys:1.1.1.5.0.4 netbsd-7:1.1.1.5.0.2 netbsd-7-base:1.1.1.5 clang-215315:1.1.1.5 clang-209886:1.1.1.4 yamt-pagecache:1.1.1.3.0.4 yamt-pagecache-base9:1.1.1.3 tls-earlyentropy:1.1.1.3.0.2 tls-earlyentropy-base:1.1.1.4 riastradh-xf86-video-intel-2-7-1-pre-2-21-15:1.1.1.3 riastradh-drm2-base3:1.1.1.3 clang-202566:1.1.1.3 clang-201163:1.1.1.3 clang-199312:1.1.1.2 clang-198450:1.1.1.2 clang-196603:1.1.1.1 clang-195771:1.1.1.1 LLVM:1.1.1; locks; strict; comment @// @; 1.1 date 2013.11.28.14.14.53; author joerg; state Exp; branches 1.1.1.1; next ; commitid ow8OybrawrB1f3fx; 1.1.1.1 date 2013.11.28.14.14.53; author joerg; state Exp; branches; next 1.1.1.2; commitid ow8OybrawrB1f3fx; 1.1.1.2 date 2014.01.05.15.38.04; author joerg; state Exp; branches; next 1.1.1.3; commitid wh3aCSIWykURqWjx; 1.1.1.3 date 2014.02.14.20.07.10; author joerg; state Exp; branches 1.1.1.3.2.1 1.1.1.3.4.1; next 1.1.1.4; commitid annVkZ1sc17rF6px; 1.1.1.4 date 2014.05.30.18.14.40; author joerg; state Exp; branches; next 1.1.1.5; commitid 8q0kdlBlCn09GACx; 1.1.1.5 date 2014.08.10.17.08.36; author joerg; state Exp; branches 1.1.1.5.2.1 1.1.1.5.4.1; next 1.1.1.6; commitid N85tXAN6Ex9VZPLx; 1.1.1.6 date 2015.01.29.19.57.31; author joerg; state Exp; branches; next 1.1.1.7; commitid mlISSizlPKvepX7y; 1.1.1.7 date 2016.02.27.22.12.09; author joerg; state Exp; branches 1.1.1.7.2.1; next 1.1.1.8; commitid tIimz3oDlh1NpBWy; 1.1.1.8 date 2017.01.11.10.33.31; 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author tls; state dead; branches; next 1.1.1.5.4.2; commitid jTnpym9Qu0o4R1Nx; 1.1.1.5.4.2 date 2014.08.19.23.47.27; author tls; state Exp; branches; next ; commitid jTnpym9Qu0o4R1Nx; 1.1.1.7.2.1 date 2017.03.20.06.52.37; author pgoyette; state Exp; branches; next ; commitid jjw7cAwgyKq7RfKz; 1.1.1.8.2.1 date 2017.04.21.16.51.38; author bouyer; state Exp; branches; next ; commitid dUG7nkTKALCadqOz; 1.1.1.10.2.1 date 2018.07.28.04.33.17; author pgoyette; state Exp; branches; next ; commitid 1UP1xAIUxv1ZgRLA; 1.1.1.10.4.1 date 2019.06.10.21.45.21; author christos; state Exp; branches; next 1.1.1.10.4.2; commitid jtc8rnCzWiEEHGqB; 1.1.1.10.4.2 date 2020.04.13.07.46.32; author martin; state dead; branches; next ; commitid X01YhRUPVUDaec4C; desc @@ 1.1 log @Initial revision @ text @//===--- CGDecl.cpp - Emit LLVM Code for declarations ---------------------===// // // The LLVM Compiler Infrastructure // // This file is distributed under the University of Illinois Open Source // License. See LICENSE.TXT for details. // //===----------------------------------------------------------------------===// // // This contains code to emit Decl nodes as LLVM code. // //===----------------------------------------------------------------------===// #include "CodeGenFunction.h" #include "CGDebugInfo.h" #include "CGOpenCLRuntime.h" #include "CodeGenModule.h" #include "clang/AST/ASTContext.h" #include "clang/AST/CharUnits.h" #include "clang/AST/Decl.h" #include "clang/AST/DeclObjC.h" #include "clang/Basic/SourceManager.h" #include "clang/Basic/TargetInfo.h" #include "clang/CodeGen/CGFunctionInfo.h" #include "clang/Frontend/CodeGenOptions.h" #include "llvm/IR/DataLayout.h" #include "llvm/IR/GlobalVariable.h" #include "llvm/IR/Intrinsics.h" #include "llvm/IR/Type.h" using namespace clang; using namespace CodeGen; void CodeGenFunction::EmitDecl(const Decl &D) { switch (D.getKind()) { case Decl::TranslationUnit: case Decl::Namespace: case Decl::UnresolvedUsingTypename: case Decl::ClassTemplateSpecialization: case Decl::ClassTemplatePartialSpecialization: case Decl::VarTemplateSpecialization: case Decl::VarTemplatePartialSpecialization: case Decl::TemplateTypeParm: case Decl::UnresolvedUsingValue: case Decl::NonTypeTemplateParm: case Decl::CXXMethod: case Decl::CXXConstructor: case Decl::CXXDestructor: case Decl::CXXConversion: case Decl::Field: case Decl::MSProperty: case Decl::IndirectField: case Decl::ObjCIvar: case Decl::ObjCAtDefsField: case Decl::ParmVar: case Decl::ImplicitParam: case Decl::ClassTemplate: case Decl::VarTemplate: case Decl::FunctionTemplate: case Decl::TypeAliasTemplate: case Decl::TemplateTemplateParm: case Decl::ObjCMethod: case Decl::ObjCCategory: case Decl::ObjCProtocol: case Decl::ObjCInterface: case Decl::ObjCCategoryImpl: case Decl::ObjCImplementation: case Decl::ObjCProperty: case Decl::ObjCCompatibleAlias: case Decl::AccessSpec: case Decl::LinkageSpec: case Decl::ObjCPropertyImpl: case Decl::FileScopeAsm: case Decl::Friend: case Decl::FriendTemplate: case Decl::Block: case Decl::Captured: case Decl::ClassScopeFunctionSpecialization: case Decl::UsingShadow: llvm_unreachable("Declaration should not be in declstmts!"); case Decl::Function: // void X(); case Decl::Record: // struct/union/class X; case Decl::Enum: // enum X; case Decl::EnumConstant: // enum ? { X = ? } case Decl::CXXRecord: // struct/union/class X; [C++] case Decl::StaticAssert: // static_assert(X, ""); [C++0x] case Decl::Label: // __label__ x; case Decl::Import: case Decl::OMPThreadPrivate: case Decl::Empty: // None of these decls require codegen support. return; case Decl::NamespaceAlias: if (CGDebugInfo *DI = getDebugInfo()) DI->EmitNamespaceAlias(cast(D)); return; case Decl::Using: // using X; [C++] if (CGDebugInfo *DI = getDebugInfo()) DI->EmitUsingDecl(cast(D)); return; case Decl::UsingDirective: // using namespace X; [C++] if (CGDebugInfo *DI = getDebugInfo()) DI->EmitUsingDirective(cast(D)); return; case Decl::Var: { const VarDecl &VD = cast(D); assert(VD.isLocalVarDecl() && "Should not see file-scope variables inside a function!"); return EmitVarDecl(VD); } case Decl::Typedef: // typedef int X; case Decl::TypeAlias: { // using X = int; [C++0x] const TypedefNameDecl &TD = cast(D); QualType Ty = TD.getUnderlyingType(); if (Ty->isVariablyModifiedType()) EmitVariablyModifiedType(Ty); } } } /// EmitVarDecl - This method handles emission of any variable declaration /// inside a function, including static vars etc. void CodeGenFunction::EmitVarDecl(const VarDecl &D) { if (D.isStaticLocal()) { llvm::GlobalValue::LinkageTypes Linkage = llvm::GlobalValue::InternalLinkage; // If the variable is externally visible, it must have weak linkage so it // can be uniqued. if (D.isExternallyVisible()) { Linkage = llvm::GlobalValue::LinkOnceODRLinkage; // FIXME: We need to force the emission/use of a guard variable for // some variables even if we can constant-evaluate them because // we can't guarantee every translation unit will constant-evaluate them. } return EmitStaticVarDecl(D, Linkage); } if (D.hasExternalStorage()) // Don't emit it now, allow it to be emitted lazily on its first use. return; if (D.getStorageClass() == SC_OpenCLWorkGroupLocal) return CGM.getOpenCLRuntime().EmitWorkGroupLocalVarDecl(*this, D); assert(D.hasLocalStorage()); return EmitAutoVarDecl(D); } static std::string GetStaticDeclName(CodeGenFunction &CGF, const VarDecl &D, const char *Separator) { CodeGenModule &CGM = CGF.CGM; if (CGF.getLangOpts().CPlusPlus) { StringRef Name = CGM.getMangledName(&D); return Name.str(); } std::string ContextName; if (!CGF.CurFuncDecl) { // Better be in a block declared in global scope. const NamedDecl *ND = cast(&D); const DeclContext *DC = ND->getDeclContext(); if (const BlockDecl *BD = dyn_cast(DC)) { MangleBuffer Name; CGM.getBlockMangledName(GlobalDecl(), Name, BD); ContextName = Name.getString(); } else llvm_unreachable("Unknown context for block static var decl"); } else if (const FunctionDecl *FD = dyn_cast(CGF.CurFuncDecl)) { StringRef Name = CGM.getMangledName(FD); ContextName = Name.str(); } else if (isa(CGF.CurFuncDecl)) ContextName = CGF.CurFn->getName(); else llvm_unreachable("Unknown context for static var decl"); return ContextName + Separator + D.getNameAsString(); } llvm::GlobalVariable * CodeGenFunction::CreateStaticVarDecl(const VarDecl &D, const char *Separator, llvm::GlobalValue::LinkageTypes Linkage) { QualType Ty = D.getType(); assert(Ty->isConstantSizeType() && "VLAs can't be static"); // Use the label if the variable is renamed with the asm-label extension. std::string Name; if (D.hasAttr()) Name = CGM.getMangledName(&D); else Name = GetStaticDeclName(*this, D, Separator); llvm::Type *LTy = CGM.getTypes().ConvertTypeForMem(Ty); unsigned AddrSpace = CGM.GetGlobalVarAddressSpace(&D, CGM.getContext().getTargetAddressSpace(Ty)); llvm::GlobalVariable *GV = new llvm::GlobalVariable(CGM.getModule(), LTy, Ty.isConstant(getContext()), Linkage, CGM.EmitNullConstant(D.getType()), Name, 0, llvm::GlobalVariable::NotThreadLocal, AddrSpace); GV->setAlignment(getContext().getDeclAlign(&D).getQuantity()); CGM.setGlobalVisibility(GV, &D); if (D.getTLSKind()) CGM.setTLSMode(GV, D); return GV; } /// hasNontrivialDestruction - Determine whether a type's destruction is /// non-trivial. If so, and the variable uses static initialization, we must /// register its destructor to run on exit. static bool hasNontrivialDestruction(QualType T) { CXXRecordDecl *RD = T->getBaseElementTypeUnsafe()->getAsCXXRecordDecl(); return RD && !RD->hasTrivialDestructor(); } /// AddInitializerToStaticVarDecl - Add the initializer for 'D' to the /// global variable that has already been created for it. If the initializer /// has a different type than GV does, this may free GV and return a different /// one. Otherwise it just returns GV. llvm::GlobalVariable * CodeGenFunction::AddInitializerToStaticVarDecl(const VarDecl &D, llvm::GlobalVariable *GV) { llvm::Constant *Init = CGM.EmitConstantInit(D, this); // If constant emission failed, then this should be a C++ static // initializer. if (!Init) { if (!getLangOpts().CPlusPlus) CGM.ErrorUnsupported(D.getInit(), "constant l-value expression"); else if (Builder.GetInsertBlock()) { // Since we have a static initializer, this global variable can't // be constant. GV->setConstant(false); EmitCXXGuardedInit(D, GV, /*PerformInit*/true); } return GV; } // The initializer may differ in type from the global. Rewrite // the global to match the initializer. (We have to do this // because some types, like unions, can't be completely represented // in the LLVM type system.) if (GV->getType()->getElementType() != Init->getType()) { llvm::GlobalVariable *OldGV = GV; GV = new llvm::GlobalVariable(CGM.getModule(), Init->getType(), OldGV->isConstant(), OldGV->getLinkage(), Init, "", /*InsertBefore*/ OldGV, OldGV->getThreadLocalMode(), CGM.getContext().getTargetAddressSpace(D.getType())); GV->setVisibility(OldGV->getVisibility()); // Steal the name of the old global GV->takeName(OldGV); // Replace all uses of the old global with the new global llvm::Constant *NewPtrForOldDecl = llvm::ConstantExpr::getBitCast(GV, OldGV->getType()); OldGV->replaceAllUsesWith(NewPtrForOldDecl); // Erase the old global, since it is no longer used. OldGV->eraseFromParent(); } GV->setConstant(CGM.isTypeConstant(D.getType(), true)); GV->setInitializer(Init); if (hasNontrivialDestruction(D.getType())) { // We have a constant initializer, but a nontrivial destructor. We still // need to perform a guarded "initialization" in order to register the // destructor. EmitCXXGuardedInit(D, GV, /*PerformInit*/false); } return GV; } void CodeGenFunction::EmitStaticVarDecl(const VarDecl &D, llvm::GlobalValue::LinkageTypes Linkage) { llvm::Value *&DMEntry = LocalDeclMap[&D]; assert(DMEntry == 0 && "Decl already exists in localdeclmap!"); // Check to see if we already have a global variable for this // declaration. This can happen when double-emitting function // bodies, e.g. with complete and base constructors. llvm::Constant *addr = CGM.getStaticLocalDeclAddress(&D); llvm::GlobalVariable *var; if (addr) { var = cast(addr->stripPointerCasts()); } else { addr = var = CreateStaticVarDecl(D, ".", Linkage); } // Store into LocalDeclMap before generating initializer to handle // circular references. DMEntry = addr; CGM.setStaticLocalDeclAddress(&D, addr); // We can't have a VLA here, but we can have a pointer to a VLA, // even though that doesn't really make any sense. // Make sure to evaluate VLA bounds now so that we have them for later. if (D.getType()->isVariablyModifiedType()) EmitVariablyModifiedType(D.getType()); // Save the type in case adding the initializer forces a type change. llvm::Type *expectedType = addr->getType(); // If this value has an initializer, emit it. if (D.getInit()) var = AddInitializerToStaticVarDecl(D, var); var->setAlignment(getContext().getDeclAlign(&D).getQuantity()); if (D.hasAttr()) CGM.AddGlobalAnnotations(&D, var); if (const SectionAttr *SA = D.getAttr()) var->setSection(SA->getName()); if (D.hasAttr()) CGM.AddUsedGlobal(var); // We may have to cast the constant because of the initializer // mismatch above. // // FIXME: It is really dangerous to store this in the map; if anyone // RAUW's the GV uses of this constant will be invalid. llvm::Constant *castedAddr = llvm::ConstantExpr::getBitCast(var, expectedType); DMEntry = castedAddr; CGM.setStaticLocalDeclAddress(&D, castedAddr); // Emit global variable debug descriptor for static vars. CGDebugInfo *DI = getDebugInfo(); if (DI && CGM.getCodeGenOpts().getDebugInfo() >= CodeGenOptions::LimitedDebugInfo) { DI->setLocation(D.getLocation()); DI->EmitGlobalVariable(var, &D); } } namespace { struct DestroyObject : EHScopeStack::Cleanup { DestroyObject(llvm::Value *addr, QualType type, CodeGenFunction::Destroyer *destroyer, bool useEHCleanupForArray) : addr(addr), type(type), destroyer(destroyer), useEHCleanupForArray(useEHCleanupForArray) {} llvm::Value *addr; QualType type; CodeGenFunction::Destroyer *destroyer; bool useEHCleanupForArray; void Emit(CodeGenFunction &CGF, Flags flags) { // Don't use an EH cleanup recursively from an EH cleanup. bool useEHCleanupForArray = flags.isForNormalCleanup() && this->useEHCleanupForArray; CGF.emitDestroy(addr, type, destroyer, useEHCleanupForArray); } }; struct DestroyNRVOVariable : EHScopeStack::Cleanup { DestroyNRVOVariable(llvm::Value *addr, const CXXDestructorDecl *Dtor, llvm::Value *NRVOFlag) : Dtor(Dtor), NRVOFlag(NRVOFlag), Loc(addr) {} const CXXDestructorDecl *Dtor; llvm::Value *NRVOFlag; llvm::Value *Loc; void Emit(CodeGenFunction &CGF, Flags flags) { // Along the exceptions path we always execute the dtor. bool NRVO = flags.isForNormalCleanup() && NRVOFlag; llvm::BasicBlock *SkipDtorBB = 0; if (NRVO) { // If we exited via NRVO, we skip the destructor call. llvm::BasicBlock *RunDtorBB = CGF.createBasicBlock("nrvo.unused"); SkipDtorBB = CGF.createBasicBlock("nrvo.skipdtor"); llvm::Value *DidNRVO = CGF.Builder.CreateLoad(NRVOFlag, "nrvo.val"); CGF.Builder.CreateCondBr(DidNRVO, SkipDtorBB, RunDtorBB); CGF.EmitBlock(RunDtorBB); } CGF.EmitCXXDestructorCall(Dtor, Dtor_Complete, /*ForVirtualBase=*/false, /*Delegating=*/false, Loc); if (NRVO) CGF.EmitBlock(SkipDtorBB); } }; struct CallStackRestore : EHScopeStack::Cleanup { llvm::Value *Stack; CallStackRestore(llvm::Value *Stack) : Stack(Stack) {} void Emit(CodeGenFunction &CGF, Flags flags) { llvm::Value *V = CGF.Builder.CreateLoad(Stack); llvm::Value *F = CGF.CGM.getIntrinsic(llvm::Intrinsic::stackrestore); CGF.Builder.CreateCall(F, V); } }; struct ExtendGCLifetime : EHScopeStack::Cleanup { const VarDecl &Var; ExtendGCLifetime(const VarDecl *var) : Var(*var) {} void Emit(CodeGenFunction &CGF, Flags flags) { // Compute the address of the local variable, in case it's a // byref or something. DeclRefExpr DRE(const_cast(&Var), false, Var.getType(), VK_LValue, SourceLocation()); llvm::Value *value = CGF.EmitLoadOfScalar(CGF.EmitDeclRefLValue(&DRE), SourceLocation()); CGF.EmitExtendGCLifetime(value); } }; struct CallCleanupFunction : EHScopeStack::Cleanup { llvm::Constant *CleanupFn; const CGFunctionInfo &FnInfo; const VarDecl &Var; CallCleanupFunction(llvm::Constant *CleanupFn, const CGFunctionInfo *Info, const VarDecl *Var) : CleanupFn(CleanupFn), FnInfo(*Info), Var(*Var) {} void Emit(CodeGenFunction &CGF, Flags flags) { DeclRefExpr DRE(const_cast(&Var), false, Var.getType(), VK_LValue, SourceLocation()); // Compute the address of the local variable, in case it's a byref // or something. llvm::Value *Addr = CGF.EmitDeclRefLValue(&DRE).getAddress(); // In some cases, the type of the function argument will be different from // the type of the pointer. An example of this is // void f(void* arg); // __attribute__((cleanup(f))) void *g; // // To fix this we insert a bitcast here. QualType ArgTy = FnInfo.arg_begin()->type; llvm::Value *Arg = CGF.Builder.CreateBitCast(Addr, CGF.ConvertType(ArgTy)); CallArgList Args; Args.add(RValue::get(Arg), CGF.getContext().getPointerType(Var.getType())); CGF.EmitCall(FnInfo, CleanupFn, ReturnValueSlot(), Args); } }; /// A cleanup to call @@llvm.lifetime.end. class CallLifetimeEnd : public EHScopeStack::Cleanup { llvm::Value *Addr; llvm::Value *Size; public: CallLifetimeEnd(llvm::Value *addr, llvm::Value *size) : Addr(addr), Size(size) {} void Emit(CodeGenFunction &CGF, Flags flags) { llvm::Value *castAddr = CGF.Builder.CreateBitCast(Addr, CGF.Int8PtrTy); CGF.Builder.CreateCall2(CGF.CGM.getLLVMLifetimeEndFn(), Size, castAddr) ->setDoesNotThrow(); } }; } /// EmitAutoVarWithLifetime - Does the setup required for an automatic /// variable with lifetime. static void EmitAutoVarWithLifetime(CodeGenFunction &CGF, const VarDecl &var, llvm::Value *addr, Qualifiers::ObjCLifetime lifetime) { switch (lifetime) { case Qualifiers::OCL_None: llvm_unreachable("present but none"); case Qualifiers::OCL_ExplicitNone: // nothing to do break; case Qualifiers::OCL_Strong: { CodeGenFunction::Destroyer *destroyer = (var.hasAttr() ? CodeGenFunction::destroyARCStrongPrecise : CodeGenFunction::destroyARCStrongImprecise); CleanupKind cleanupKind = CGF.getARCCleanupKind(); CGF.pushDestroy(cleanupKind, addr, var.getType(), destroyer, cleanupKind & EHCleanup); break; } case Qualifiers::OCL_Autoreleasing: // nothing to do break; case Qualifiers::OCL_Weak: // __weak objects always get EH cleanups; otherwise, exceptions // could cause really nasty crashes instead of mere leaks. CGF.pushDestroy(NormalAndEHCleanup, addr, var.getType(), CodeGenFunction::destroyARCWeak, /*useEHCleanup*/ true); break; } } static bool isAccessedBy(const VarDecl &var, const Stmt *s) { if (const Expr *e = dyn_cast(s)) { // Skip the most common kinds of expressions that make // hierarchy-walking expensive. s = e = e->IgnoreParenCasts(); if (const DeclRefExpr *ref = dyn_cast(e)) return (ref->getDecl() == &var); if (const BlockExpr *be = dyn_cast(e)) { const BlockDecl *block = be->getBlockDecl(); for (BlockDecl::capture_const_iterator i = block->capture_begin(), e = block->capture_end(); i != e; ++i) { if (i->getVariable() == &var) return true; } } } for (Stmt::const_child_range children = s->children(); children; ++children) // children might be null; as in missing decl or conditional of an if-stmt. if ((*children) && isAccessedBy(var, *children)) return true; return false; } static bool isAccessedBy(const ValueDecl *decl, const Expr *e) { if (!decl) return false; if (!isa(decl)) return false; const VarDecl *var = cast(decl); return isAccessedBy(*var, e); } static void drillIntoBlockVariable(CodeGenFunction &CGF, LValue &lvalue, const VarDecl *var) { lvalue.setAddress(CGF.BuildBlockByrefAddress(lvalue.getAddress(), var)); } void CodeGenFunction::EmitScalarInit(const Expr *init, const ValueDecl *D, LValue lvalue, bool capturedByInit) { Qualifiers::ObjCLifetime lifetime = lvalue.getObjCLifetime(); if (!lifetime) { llvm::Value *value = EmitScalarExpr(init); if (capturedByInit) drillIntoBlockVariable(*this, lvalue, cast(D)); EmitStoreThroughLValue(RValue::get(value), lvalue, true); return; } // If we're emitting a value with lifetime, we have to do the // initialization *before* we leave the cleanup scopes. if (const ExprWithCleanups *ewc = dyn_cast(init)) { enterFullExpression(ewc); init = ewc->getSubExpr(); } CodeGenFunction::RunCleanupsScope Scope(*this); // We have to maintain the illusion that the variable is // zero-initialized. If the variable might be accessed in its // initializer, zero-initialize before running the initializer, then // actually perform the initialization with an assign. bool accessedByInit = false; if (lifetime != Qualifiers::OCL_ExplicitNone) accessedByInit = (capturedByInit || isAccessedBy(D, init)); if (accessedByInit) { LValue tempLV = lvalue; // Drill down to the __block object if necessary. if (capturedByInit) { // We can use a simple GEP for this because it can't have been // moved yet. tempLV.setAddress(Builder.CreateStructGEP(tempLV.getAddress(), getByRefValueLLVMField(cast(D)))); } llvm::PointerType *ty = cast(tempLV.getAddress()->getType()); ty = cast(ty->getElementType()); llvm::Value *zero = llvm::ConstantPointerNull::get(ty); // If __weak, we want to use a barrier under certain conditions. if (lifetime == Qualifiers::OCL_Weak) EmitARCInitWeak(tempLV.getAddress(), zero); // Otherwise just do a simple store. else EmitStoreOfScalar(zero, tempLV, /* isInitialization */ true); } // Emit the initializer. llvm::Value *value = 0; switch (lifetime) { case Qualifiers::OCL_None: llvm_unreachable("present but none"); case Qualifiers::OCL_ExplicitNone: // nothing to do value = EmitScalarExpr(init); break; case Qualifiers::OCL_Strong: { value = EmitARCRetainScalarExpr(init); break; } case Qualifiers::OCL_Weak: { // No way to optimize a producing initializer into this. It's not // worth optimizing for, because the value will immediately // disappear in the common case. value = EmitScalarExpr(init); if (capturedByInit) drillIntoBlockVariable(*this, lvalue, cast(D)); if (accessedByInit) EmitARCStoreWeak(lvalue.getAddress(), value, /*ignored*/ true); else EmitARCInitWeak(lvalue.getAddress(), value); return; } case Qualifiers::OCL_Autoreleasing: value = EmitARCRetainAutoreleaseScalarExpr(init); break; } if (capturedByInit) drillIntoBlockVariable(*this, lvalue, cast(D)); // If the variable might have been accessed by its initializer, we // might have to initialize with a barrier. We have to do this for // both __weak and __strong, but __weak got filtered out above. if (accessedByInit && lifetime == Qualifiers::OCL_Strong) { llvm::Value *oldValue = EmitLoadOfScalar(lvalue, init->getExprLoc()); EmitStoreOfScalar(value, lvalue, /* isInitialization */ true); EmitARCRelease(oldValue, ARCImpreciseLifetime); return; } EmitStoreOfScalar(value, lvalue, /* isInitialization */ true); } /// EmitScalarInit - Initialize the given lvalue with the given object. void CodeGenFunction::EmitScalarInit(llvm::Value *init, LValue lvalue) { Qualifiers::ObjCLifetime lifetime = lvalue.getObjCLifetime(); if (!lifetime) return EmitStoreThroughLValue(RValue::get(init), lvalue, true); switch (lifetime) { case Qualifiers::OCL_None: llvm_unreachable("present but none"); case Qualifiers::OCL_ExplicitNone: // nothing to do break; case Qualifiers::OCL_Strong: init = EmitARCRetain(lvalue.getType(), init); break; case Qualifiers::OCL_Weak: // Initialize and then skip the primitive store. EmitARCInitWeak(lvalue.getAddress(), init); return; case Qualifiers::OCL_Autoreleasing: init = EmitARCRetainAutorelease(lvalue.getType(), init); break; } EmitStoreOfScalar(init, lvalue, /* isInitialization */ true); } /// canEmitInitWithFewStoresAfterMemset - Decide whether we can emit the /// non-zero parts of the specified initializer with equal or fewer than /// NumStores scalar stores. static bool canEmitInitWithFewStoresAfterMemset(llvm::Constant *Init, unsigned &NumStores) { // Zero and Undef never requires any extra stores. if (isa(Init) || isa(Init) || isa(Init)) return true; if (isa(Init) || isa(Init) || isa(Init) || isa(Init) || isa(Init)) return Init->isNullValue() || NumStores--; // See if we can emit each element. if (isa(Init) || isa(Init)) { for (unsigned i = 0, e = Init->getNumOperands(); i != e; ++i) { llvm::Constant *Elt = cast(Init->getOperand(i)); if (!canEmitInitWithFewStoresAfterMemset(Elt, NumStores)) return false; } return true; } if (llvm::ConstantDataSequential *CDS = dyn_cast(Init)) { for (unsigned i = 0, e = CDS->getNumElements(); i != e; ++i) { llvm::Constant *Elt = CDS->getElementAsConstant(i); if (!canEmitInitWithFewStoresAfterMemset(Elt, NumStores)) return false; } return true; } // Anything else is hard and scary. return false; } /// emitStoresForInitAfterMemset - For inits that /// canEmitInitWithFewStoresAfterMemset returned true for, emit the scalar /// stores that would be required. static void emitStoresForInitAfterMemset(llvm::Constant *Init, llvm::Value *Loc, bool isVolatile, CGBuilderTy &Builder) { assert(!Init->isNullValue() && !isa(Init) && "called emitStoresForInitAfterMemset for zero or undef value."); if (isa(Init) || isa(Init) || isa(Init) || isa(Init) || isa(Init)) { Builder.CreateStore(Init, Loc, isVolatile); return; } if (llvm::ConstantDataSequential *CDS = dyn_cast(Init)) { for (unsigned i = 0, e = CDS->getNumElements(); i != e; ++i) { llvm::Constant *Elt = CDS->getElementAsConstant(i); // If necessary, get a pointer to the element and emit it. if (!Elt->isNullValue() && !isa(Elt)) emitStoresForInitAfterMemset(Elt, Builder.CreateConstGEP2_32(Loc, 0, i), isVolatile, Builder); } return; } assert((isa(Init) || isa(Init)) && "Unknown value type!"); for (unsigned i = 0, e = Init->getNumOperands(); i != e; ++i) { llvm::Constant *Elt = cast(Init->getOperand(i)); // If necessary, get a pointer to the element and emit it. if (!Elt->isNullValue() && !isa(Elt)) emitStoresForInitAfterMemset(Elt, Builder.CreateConstGEP2_32(Loc, 0, i), isVolatile, Builder); } } /// shouldUseMemSetPlusStoresToInitialize - Decide whether we should use memset /// plus some stores to initialize a local variable instead of using a memcpy /// from a constant global. It is beneficial to use memset if the global is all /// zeros, or mostly zeros and large. static bool shouldUseMemSetPlusStoresToInitialize(llvm::Constant *Init, uint64_t GlobalSize) { // If a global is all zeros, always use a memset. if (isa(Init)) return true; // If a non-zero global is <= 32 bytes, always use a memcpy. If it is large, // do it if it will require 6 or fewer scalar stores. // TODO: Should budget depends on the size? Avoiding a large global warrants // plopping in more stores. unsigned StoreBudget = 6; uint64_t SizeLimit = 32; return GlobalSize > SizeLimit && canEmitInitWithFewStoresAfterMemset(Init, StoreBudget); } /// Should we use the LLVM lifetime intrinsics for the given local variable? static bool shouldUseLifetimeMarkers(CodeGenFunction &CGF, const VarDecl &D, unsigned Size) { // Always emit lifetime markers in -fsanitize=use-after-scope mode. if (CGF.getLangOpts().Sanitize.UseAfterScope) return true; // For now, only in optimized builds. if (CGF.CGM.getCodeGenOpts().OptimizationLevel == 0) return false; // Limit the size of marked objects to 32 bytes. We don't want to increase // compile time by marking tiny objects. unsigned SizeThreshold = 32; return Size > SizeThreshold; } /// EmitAutoVarDecl - Emit code and set up an entry in LocalDeclMap for a /// variable declaration with auto, register, or no storage class specifier. /// These turn into simple stack objects, or GlobalValues depending on target. void CodeGenFunction::EmitAutoVarDecl(const VarDecl &D) { AutoVarEmission emission = EmitAutoVarAlloca(D); EmitAutoVarInit(emission); EmitAutoVarCleanups(emission); } /// EmitAutoVarAlloca - Emit the alloca and debug information for a /// local variable. Does not emit initalization or destruction. CodeGenFunction::AutoVarEmission CodeGenFunction::EmitAutoVarAlloca(const VarDecl &D) { QualType Ty = D.getType(); AutoVarEmission emission(D); bool isByRef = D.hasAttr(); emission.IsByRef = isByRef; CharUnits alignment = getContext().getDeclAlign(&D); emission.Alignment = alignment; // If the type is variably-modified, emit all the VLA sizes for it. if (Ty->isVariablyModifiedType()) EmitVariablyModifiedType(Ty); llvm::Value *DeclPtr; if (Ty->isConstantSizeType()) { bool NRVO = getLangOpts().ElideConstructors && D.isNRVOVariable(); // If this value is an array or struct with a statically determinable // constant initializer, there are optimizations we can do. // // TODO: We should constant-evaluate the initializer of any variable, // as long as it is initialized by a constant expression. Currently, // isConstantInitializer produces wrong answers for structs with // reference or bitfield members, and a few other cases, and checking // for POD-ness protects us from some of these. if (D.getInit() && (Ty->isArrayType() || Ty->isRecordType()) && (D.isConstexpr() || ((Ty.isPODType(getContext()) || getContext().getBaseElementType(Ty)->isObjCObjectPointerType()) && D.getInit()->isConstantInitializer(getContext(), false)))) { // If the variable's a const type, and it's neither an NRVO // candidate nor a __block variable and has no mutable members, // emit it as a global instead. if (CGM.getCodeGenOpts().MergeAllConstants && !NRVO && !isByRef && CGM.isTypeConstant(Ty, true)) { EmitStaticVarDecl(D, llvm::GlobalValue::InternalLinkage); emission.Address = 0; // signal this condition to later callbacks assert(emission.wasEmittedAsGlobal()); return emission; } // Otherwise, tell the initialization code that we're in this case. emission.IsConstantAggregate = true; } // A normal fixed sized variable becomes an alloca in the entry block, // unless it's an NRVO variable. llvm::Type *LTy = ConvertTypeForMem(Ty); if (NRVO) { // The named return value optimization: allocate this variable in the // return slot, so that we can elide the copy when returning this // variable (C++0x [class.copy]p34). DeclPtr = ReturnValue; if (const RecordType *RecordTy = Ty->getAs()) { if (!cast(RecordTy->getDecl())->hasTrivialDestructor()) { // Create a flag that is used to indicate when the NRVO was applied // to this variable. Set it to zero to indicate that NRVO was not // applied. llvm::Value *Zero = Builder.getFalse(); llvm::Value *NRVOFlag = CreateTempAlloca(Zero->getType(), "nrvo"); EnsureInsertPoint(); Builder.CreateStore(Zero, NRVOFlag); // Record the NRVO flag for this variable. NRVOFlags[&D] = NRVOFlag; emission.NRVOFlag = NRVOFlag; } } } else { if (isByRef) LTy = BuildByRefType(&D); llvm::AllocaInst *Alloc = CreateTempAlloca(LTy); Alloc->setName(D.getName()); CharUnits allocaAlignment = alignment; if (isByRef) allocaAlignment = std::max(allocaAlignment, getContext().toCharUnitsFromBits(getTarget().getPointerAlign(0))); Alloc->setAlignment(allocaAlignment.getQuantity()); DeclPtr = Alloc; // Emit a lifetime intrinsic if meaningful. There's no point // in doing this if we don't have a valid insertion point (?). uint64_t size = CGM.getDataLayout().getTypeAllocSize(LTy); if (HaveInsertPoint() && shouldUseLifetimeMarkers(*this, D, size)) { llvm::Value *sizeV = llvm::ConstantInt::get(Int64Ty, size); emission.SizeForLifetimeMarkers = sizeV; llvm::Value *castAddr = Builder.CreateBitCast(Alloc, Int8PtrTy); Builder.CreateCall2(CGM.getLLVMLifetimeStartFn(), sizeV, castAddr) ->setDoesNotThrow(); } else { assert(!emission.useLifetimeMarkers()); } } } else { EnsureInsertPoint(); if (!DidCallStackSave) { // Save the stack. llvm::Value *Stack = CreateTempAlloca(Int8PtrTy, "saved_stack"); llvm::Value *F = CGM.getIntrinsic(llvm::Intrinsic::stacksave); llvm::Value *V = Builder.CreateCall(F); Builder.CreateStore(V, Stack); DidCallStackSave = true; // Push a cleanup block and restore the stack there. // FIXME: in general circumstances, this should be an EH cleanup. EHStack.pushCleanup(NormalCleanup, Stack); } llvm::Value *elementCount; QualType elementType; llvm::tie(elementCount, elementType) = getVLASize(Ty); llvm::Type *llvmTy = ConvertTypeForMem(elementType); // Allocate memory for the array. llvm::AllocaInst *vla = Builder.CreateAlloca(llvmTy, elementCount, "vla"); vla->setAlignment(alignment.getQuantity()); DeclPtr = vla; } llvm::Value *&DMEntry = LocalDeclMap[&D]; assert(DMEntry == 0 && "Decl already exists in localdeclmap!"); DMEntry = DeclPtr; emission.Address = DeclPtr; // Emit debug info for local var declaration. if (HaveInsertPoint()) if (CGDebugInfo *DI = getDebugInfo()) { if (CGM.getCodeGenOpts().getDebugInfo() >= CodeGenOptions::LimitedDebugInfo) { DI->setLocation(D.getLocation()); DI->EmitDeclareOfAutoVariable(&D, DeclPtr, Builder); } } if (D.hasAttr()) EmitVarAnnotations(&D, emission.Address); return emission; } /// Determines whether the given __block variable is potentially /// captured by the given expression. static bool isCapturedBy(const VarDecl &var, const Expr *e) { // Skip the most common kinds of expressions that make // hierarchy-walking expensive. e = e->IgnoreParenCasts(); if (const BlockExpr *be = dyn_cast(e)) { const BlockDecl *block = be->getBlockDecl(); for (BlockDecl::capture_const_iterator i = block->capture_begin(), e = block->capture_end(); i != e; ++i) { if (i->getVariable() == &var) return true; } // No need to walk into the subexpressions. return false; } if (const StmtExpr *SE = dyn_cast(e)) { const CompoundStmt *CS = SE->getSubStmt(); for (CompoundStmt::const_body_iterator BI = CS->body_begin(), BE = CS->body_end(); BI != BE; ++BI) if (Expr *E = dyn_cast((*BI))) { if (isCapturedBy(var, E)) return true; } else if (DeclStmt *DS = dyn_cast((*BI))) { // special case declarations for (DeclStmt::decl_iterator I = DS->decl_begin(), E = DS->decl_end(); I != E; ++I) { if (VarDecl *VD = dyn_cast((*I))) { Expr *Init = VD->getInit(); if (Init && isCapturedBy(var, Init)) return true; } } } else // FIXME. Make safe assumption assuming arbitrary statements cause capturing. // Later, provide code to poke into statements for capture analysis. return true; return false; } for (Stmt::const_child_range children = e->children(); children; ++children) if (isCapturedBy(var, cast(*children))) return true; return false; } /// \brief Determine whether the given initializer is trivial in the sense /// that it requires no code to be generated. static bool isTrivialInitializer(const Expr *Init) { if (!Init) return true; if (const CXXConstructExpr *Construct = dyn_cast(Init)) if (CXXConstructorDecl *Constructor = Construct->getConstructor()) if (Constructor->isTrivial() && Constructor->isDefaultConstructor() && !Construct->requiresZeroInitialization()) return true; return false; } void CodeGenFunction::EmitAutoVarInit(const AutoVarEmission &emission) { assert(emission.Variable && "emission was not valid!"); // If this was emitted as a global constant, we're done. if (emission.wasEmittedAsGlobal()) return; const VarDecl &D = *emission.Variable; QualType type = D.getType(); // If this local has an initializer, emit it now. const Expr *Init = D.getInit(); // If we are at an unreachable point, we don't need to emit the initializer // unless it contains a label. if (!HaveInsertPoint()) { if (!Init || !ContainsLabel(Init)) return; EnsureInsertPoint(); } // Initialize the structure of a __block variable. if (emission.IsByRef) emitByrefStructureInit(emission); if (isTrivialInitializer(Init)) return; CharUnits alignment = emission.Alignment; // Check whether this is a byref variable that's potentially // captured and moved by its own initializer. If so, we'll need to // emit the initializer first, then copy into the variable. bool capturedByInit = emission.IsByRef && isCapturedBy(D, Init); llvm::Value *Loc = capturedByInit ? emission.Address : emission.getObjectAddress(*this); llvm::Constant *constant = 0; if (emission.IsConstantAggregate || D.isConstexpr()) { assert(!capturedByInit && "constant init contains a capturing block?"); constant = CGM.EmitConstantInit(D, this); } if (!constant) { LValue lv = MakeAddrLValue(Loc, type, alignment); lv.setNonGC(true); return EmitExprAsInit(Init, &D, lv, capturedByInit); } if (!emission.IsConstantAggregate) { // For simple scalar/complex initialization, store the value directly. LValue lv = MakeAddrLValue(Loc, type, alignment); lv.setNonGC(true); return EmitStoreThroughLValue(RValue::get(constant), lv, true); } // If this is a simple aggregate initialization, we can optimize it // in various ways. bool isVolatile = type.isVolatileQualified(); llvm::Value *SizeVal = llvm::ConstantInt::get(IntPtrTy, getContext().getTypeSizeInChars(type).getQuantity()); llvm::Type *BP = Int8PtrTy; if (Loc->getType() != BP) Loc = Builder.CreateBitCast(Loc, BP); // If the initializer is all or mostly zeros, codegen with memset then do // a few stores afterward. if (shouldUseMemSetPlusStoresToInitialize(constant, CGM.getDataLayout().getTypeAllocSize(constant->getType()))) { Builder.CreateMemSet(Loc, llvm::ConstantInt::get(Int8Ty, 0), SizeVal, alignment.getQuantity(), isVolatile); // Zero and undef don't require a stores. if (!constant->isNullValue() && !isa(constant)) { Loc = Builder.CreateBitCast(Loc, constant->getType()->getPointerTo()); emitStoresForInitAfterMemset(constant, Loc, isVolatile, Builder); } } else { // Otherwise, create a temporary global with the initializer then // memcpy from the global to the alloca. std::string Name = GetStaticDeclName(*this, D, "."); llvm::GlobalVariable *GV = new llvm::GlobalVariable(CGM.getModule(), constant->getType(), true, llvm::GlobalValue::PrivateLinkage, constant, Name); GV->setAlignment(alignment.getQuantity()); GV->setUnnamedAddr(true); llvm::Value *SrcPtr = GV; if (SrcPtr->getType() != BP) SrcPtr = Builder.CreateBitCast(SrcPtr, BP); Builder.CreateMemCpy(Loc, SrcPtr, SizeVal, alignment.getQuantity(), isVolatile); } } /// Emit an expression as an initializer for a variable at the given /// location. The expression is not necessarily the normal /// initializer for the variable, and the address is not necessarily /// its normal location. /// /// \param init the initializing expression /// \param var the variable to act as if we're initializing /// \param loc the address to initialize; its type is a pointer /// to the LLVM mapping of the variable's type /// \param alignment the alignment of the address /// \param capturedByInit true if the variable is a __block variable /// whose address is potentially changed by the initializer void CodeGenFunction::EmitExprAsInit(const Expr *init, const ValueDecl *D, LValue lvalue, bool capturedByInit) { QualType type = D->getType(); if (type->isReferenceType()) { RValue rvalue = EmitReferenceBindingToExpr(init); if (capturedByInit) drillIntoBlockVariable(*this, lvalue, cast(D)); EmitStoreThroughLValue(rvalue, lvalue, true); return; } switch (getEvaluationKind(type)) { case TEK_Scalar: EmitScalarInit(init, D, lvalue, capturedByInit); return; case TEK_Complex: { ComplexPairTy complex = EmitComplexExpr(init); if (capturedByInit) drillIntoBlockVariable(*this, lvalue, cast(D)); EmitStoreOfComplex(complex, lvalue, /*init*/ true); return; } case TEK_Aggregate: if (type->isAtomicType()) { EmitAtomicInit(const_cast(init), lvalue); } else { // TODO: how can we delay here if D is captured by its initializer? EmitAggExpr(init, AggValueSlot::forLValue(lvalue, AggValueSlot::IsDestructed, AggValueSlot::DoesNotNeedGCBarriers, AggValueSlot::IsNotAliased)); } return; } llvm_unreachable("bad evaluation kind"); } /// Enter a destroy cleanup for the given local variable. void CodeGenFunction::emitAutoVarTypeCleanup( const CodeGenFunction::AutoVarEmission &emission, QualType::DestructionKind dtorKind) { assert(dtorKind != QualType::DK_none); // Note that for __block variables, we want to destroy the // original stack object, not the possibly forwarded object. llvm::Value *addr = emission.getObjectAddress(*this); const VarDecl *var = emission.Variable; QualType type = var->getType(); CleanupKind cleanupKind = NormalAndEHCleanup; CodeGenFunction::Destroyer *destroyer = 0; switch (dtorKind) { case QualType::DK_none: llvm_unreachable("no cleanup for trivially-destructible variable"); case QualType::DK_cxx_destructor: // If there's an NRVO flag on the emission, we need a different // cleanup. if (emission.NRVOFlag) { assert(!type->isArrayType()); CXXDestructorDecl *dtor = type->getAsCXXRecordDecl()->getDestructor(); EHStack.pushCleanup(cleanupKind, addr, dtor, emission.NRVOFlag); return; } break; case QualType::DK_objc_strong_lifetime: // Suppress cleanups for pseudo-strong variables. if (var->isARCPseudoStrong()) return; // Otherwise, consider whether to use an EH cleanup or not. cleanupKind = getARCCleanupKind(); // Use the imprecise destroyer by default. if (!var->hasAttr()) destroyer = CodeGenFunction::destroyARCStrongImprecise; break; case QualType::DK_objc_weak_lifetime: break; } // If we haven't chosen a more specific destroyer, use the default. if (!destroyer) destroyer = getDestroyer(dtorKind); // Use an EH cleanup in array destructors iff the destructor itself // is being pushed as an EH cleanup. bool useEHCleanup = (cleanupKind & EHCleanup); EHStack.pushCleanup(cleanupKind, addr, type, destroyer, useEHCleanup); } void CodeGenFunction::EmitAutoVarCleanups(const AutoVarEmission &emission) { assert(emission.Variable && "emission was not valid!"); // If this was emitted as a global constant, we're done. if (emission.wasEmittedAsGlobal()) return; // If we don't have an insertion point, we're done. Sema prevents // us from jumping into any of these scopes anyway. if (!HaveInsertPoint()) return; const VarDecl &D = *emission.Variable; // Make sure we call @@llvm.lifetime.end. This needs to happen // *last*, so the cleanup needs to be pushed *first*. if (emission.useLifetimeMarkers()) { EHStack.pushCleanup(NormalCleanup, emission.getAllocatedAddress(), emission.getSizeForLifetimeMarkers()); } // Check the type for a cleanup. if (QualType::DestructionKind dtorKind = D.getType().isDestructedType()) emitAutoVarTypeCleanup(emission, dtorKind); // In GC mode, honor objc_precise_lifetime. if (getLangOpts().getGC() != LangOptions::NonGC && D.hasAttr()) { EHStack.pushCleanup(NormalCleanup, &D); } // Handle the cleanup attribute. if (const CleanupAttr *CA = D.getAttr()) { const FunctionDecl *FD = CA->getFunctionDecl(); llvm::Constant *F = CGM.GetAddrOfFunction(FD); assert(F && "Could not find function!"); const CGFunctionInfo &Info = CGM.getTypes().arrangeFunctionDeclaration(FD); EHStack.pushCleanup(NormalAndEHCleanup, F, &Info, &D); } // If this is a block variable, call _Block_object_destroy // (on the unforwarded address). if (emission.IsByRef) enterByrefCleanup(emission); } CodeGenFunction::Destroyer * CodeGenFunction::getDestroyer(QualType::DestructionKind kind) { switch (kind) { case QualType::DK_none: llvm_unreachable("no destroyer for trivial dtor"); case QualType::DK_cxx_destructor: return destroyCXXObject; case QualType::DK_objc_strong_lifetime: return destroyARCStrongPrecise; case QualType::DK_objc_weak_lifetime: return destroyARCWeak; } llvm_unreachable("Unknown DestructionKind"); } /// pushEHDestroy - Push the standard destructor for the given type as /// an EH-only cleanup. void CodeGenFunction::pushEHDestroy(QualType::DestructionKind dtorKind, llvm::Value *addr, QualType type) { assert(dtorKind && "cannot push destructor for trivial type"); assert(needsEHCleanup(dtorKind)); pushDestroy(EHCleanup, addr, type, getDestroyer(dtorKind), true); } /// pushDestroy - Push the standard destructor for the given type as /// at least a normal cleanup. void CodeGenFunction::pushDestroy(QualType::DestructionKind dtorKind, llvm::Value *addr, QualType type) { assert(dtorKind && "cannot push destructor for trivial type"); CleanupKind cleanupKind = getCleanupKind(dtorKind); pushDestroy(cleanupKind, addr, type, getDestroyer(dtorKind), cleanupKind & EHCleanup); } void CodeGenFunction::pushDestroy(CleanupKind cleanupKind, llvm::Value *addr, QualType type, Destroyer *destroyer, bool useEHCleanupForArray) { pushFullExprCleanup(cleanupKind, addr, type, destroyer, useEHCleanupForArray); } void CodeGenFunction::pushLifetimeExtendedDestroy( CleanupKind cleanupKind, llvm::Value *addr, QualType type, Destroyer *destroyer, bool useEHCleanupForArray) { assert(!isInConditionalBranch() && "performing lifetime extension from within conditional"); // Push an EH-only cleanup for the object now. // FIXME: When popping normal cleanups, we need to keep this EH cleanup // around in case a temporary's destructor throws an exception. if (cleanupKind & EHCleanup) EHStack.pushCleanup( static_cast(cleanupKind & ~NormalCleanup), addr, type, destroyer, useEHCleanupForArray); // Remember that we need to push a full cleanup for the object at the // end of the full-expression. pushCleanupAfterFullExpr( cleanupKind, addr, type, destroyer, useEHCleanupForArray); } /// emitDestroy - Immediately perform the destruction of the given /// object. /// /// \param addr - the address of the object; a type* /// \param type - the type of the object; if an array type, all /// objects are destroyed in reverse order /// \param destroyer - the function to call to destroy individual /// elements /// \param useEHCleanupForArray - whether an EH cleanup should be /// used when destroying array elements, in case one of the /// destructions throws an exception void CodeGenFunction::emitDestroy(llvm::Value *addr, QualType type, Destroyer *destroyer, bool useEHCleanupForArray) { const ArrayType *arrayType = getContext().getAsArrayType(type); if (!arrayType) return destroyer(*this, addr, type); llvm::Value *begin = addr; llvm::Value *length = emitArrayLength(arrayType, type, begin); // Normally we have to check whether the array is zero-length. bool checkZeroLength = true; // But if the array length is constant, we can suppress that. if (llvm::ConstantInt *constLength = dyn_cast(length)) { // ...and if it's constant zero, we can just skip the entire thing. if (constLength->isZero()) return; checkZeroLength = false; } llvm::Value *end = Builder.CreateInBoundsGEP(begin, length); emitArrayDestroy(begin, end, type, destroyer, checkZeroLength, useEHCleanupForArray); } /// emitArrayDestroy - Destroys all the elements of the given array, /// beginning from last to first. The array cannot be zero-length. /// /// \param begin - a type* denoting the first element of the array /// \param end - a type* denoting one past the end of the array /// \param type - the element type of the array /// \param destroyer - the function to call to destroy elements /// \param useEHCleanup - whether to push an EH cleanup to destroy /// the remaining elements in case the destruction of a single /// element throws void CodeGenFunction::emitArrayDestroy(llvm::Value *begin, llvm::Value *end, QualType type, Destroyer *destroyer, bool checkZeroLength, bool useEHCleanup) { assert(!type->isArrayType()); // The basic structure here is a do-while loop, because we don't // need to check for the zero-element case. llvm::BasicBlock *bodyBB = createBasicBlock("arraydestroy.body"); llvm::BasicBlock *doneBB = createBasicBlock("arraydestroy.done"); if (checkZeroLength) { llvm::Value *isEmpty = Builder.CreateICmpEQ(begin, end, "arraydestroy.isempty"); Builder.CreateCondBr(isEmpty, doneBB, bodyBB); } // Enter the loop body, making that address the current address. llvm::BasicBlock *entryBB = Builder.GetInsertBlock(); EmitBlock(bodyBB); llvm::PHINode *elementPast = Builder.CreatePHI(begin->getType(), 2, "arraydestroy.elementPast"); elementPast->addIncoming(end, entryBB); // Shift the address back by one element. llvm::Value *negativeOne = llvm::ConstantInt::get(SizeTy, -1, true); llvm::Value *element = Builder.CreateInBoundsGEP(elementPast, negativeOne, "arraydestroy.element"); if (useEHCleanup) pushRegularPartialArrayCleanup(begin, element, type, destroyer); // Perform the actual destruction there. destroyer(*this, element, type); if (useEHCleanup) PopCleanupBlock(); // Check whether we've reached the end. llvm::Value *done = Builder.CreateICmpEQ(element, begin, "arraydestroy.done"); Builder.CreateCondBr(done, doneBB, bodyBB); elementPast->addIncoming(element, Builder.GetInsertBlock()); // Done. EmitBlock(doneBB); } /// Perform partial array destruction as if in an EH cleanup. Unlike /// emitArrayDestroy, the element type here may still be an array type. static void emitPartialArrayDestroy(CodeGenFunction &CGF, llvm::Value *begin, llvm::Value *end, QualType type, CodeGenFunction::Destroyer *destroyer) { // If the element type is itself an array, drill down. unsigned arrayDepth = 0; while (const ArrayType *arrayType = CGF.getContext().getAsArrayType(type)) { // VLAs don't require a GEP index to walk into. if (!isa(arrayType)) arrayDepth++; type = arrayType->getElementType(); } if (arrayDepth) { llvm::Value *zero = llvm::ConstantInt::get(CGF.SizeTy, arrayDepth+1); SmallVector gepIndices(arrayDepth, zero); begin = CGF.Builder.CreateInBoundsGEP(begin, gepIndices, "pad.arraybegin"); end = CGF.Builder.CreateInBoundsGEP(end, gepIndices, "pad.arrayend"); } // Destroy the array. We don't ever need an EH cleanup because we // assume that we're in an EH cleanup ourselves, so a throwing // destructor causes an immediate terminate. CGF.emitArrayDestroy(begin, end, type, destroyer, /*checkZeroLength*/ true, /*useEHCleanup*/ false); } namespace { /// RegularPartialArrayDestroy - a cleanup which performs a partial /// array destroy where the end pointer is regularly determined and /// does not need to be loaded from a local. class RegularPartialArrayDestroy : public EHScopeStack::Cleanup { llvm::Value *ArrayBegin; llvm::Value *ArrayEnd; QualType ElementType; CodeGenFunction::Destroyer *Destroyer; public: RegularPartialArrayDestroy(llvm::Value *arrayBegin, llvm::Value *arrayEnd, QualType elementType, CodeGenFunction::Destroyer *destroyer) : ArrayBegin(arrayBegin), ArrayEnd(arrayEnd), ElementType(elementType), Destroyer(destroyer) {} void Emit(CodeGenFunction &CGF, Flags flags) { emitPartialArrayDestroy(CGF, ArrayBegin, ArrayEnd, ElementType, Destroyer); } }; /// IrregularPartialArrayDestroy - a cleanup which performs a /// partial array destroy where the end pointer is irregularly /// determined and must be loaded from a local. class IrregularPartialArrayDestroy : public EHScopeStack::Cleanup { llvm::Value *ArrayBegin; llvm::Value *ArrayEndPointer; QualType ElementType; CodeGenFunction::Destroyer *Destroyer; public: IrregularPartialArrayDestroy(llvm::Value *arrayBegin, llvm::Value *arrayEndPointer, QualType elementType, CodeGenFunction::Destroyer *destroyer) : ArrayBegin(arrayBegin), ArrayEndPointer(arrayEndPointer), ElementType(elementType), Destroyer(destroyer) {} void Emit(CodeGenFunction &CGF, Flags flags) { llvm::Value *arrayEnd = CGF.Builder.CreateLoad(ArrayEndPointer); emitPartialArrayDestroy(CGF, ArrayBegin, arrayEnd, ElementType, Destroyer); } }; } /// pushIrregularPartialArrayCleanup - Push an EH cleanup to destroy /// already-constructed elements of the given array. The cleanup /// may be popped with DeactivateCleanupBlock or PopCleanupBlock. /// /// \param elementType - the immediate element type of the array; /// possibly still an array type void CodeGenFunction::pushIrregularPartialArrayCleanup(llvm::Value *arrayBegin, llvm::Value *arrayEndPointer, QualType elementType, Destroyer *destroyer) { pushFullExprCleanup(EHCleanup, arrayBegin, arrayEndPointer, elementType, destroyer); } /// pushRegularPartialArrayCleanup - Push an EH cleanup to destroy /// already-constructed elements of the given array. The cleanup /// may be popped with DeactivateCleanupBlock or PopCleanupBlock. /// /// \param elementType - the immediate element type of the array; /// possibly still an array type void CodeGenFunction::pushRegularPartialArrayCleanup(llvm::Value *arrayBegin, llvm::Value *arrayEnd, QualType elementType, Destroyer *destroyer) { pushFullExprCleanup(EHCleanup, arrayBegin, arrayEnd, elementType, destroyer); } /// Lazily declare the @@llvm.lifetime.start intrinsic. llvm::Constant *CodeGenModule::getLLVMLifetimeStartFn() { if (LifetimeStartFn) return LifetimeStartFn; LifetimeStartFn = llvm::Intrinsic::getDeclaration(&getModule(), llvm::Intrinsic::lifetime_start); return LifetimeStartFn; } /// Lazily declare the @@llvm.lifetime.end intrinsic. llvm::Constant *CodeGenModule::getLLVMLifetimeEndFn() { if (LifetimeEndFn) return LifetimeEndFn; LifetimeEndFn = llvm::Intrinsic::getDeclaration(&getModule(), llvm::Intrinsic::lifetime_end); return LifetimeEndFn; } namespace { /// A cleanup to perform a release of an object at the end of a /// function. This is used to balance out the incoming +1 of a /// ns_consumed argument when we can't reasonably do that just by /// not doing the initial retain for a __block argument. struct ConsumeARCParameter : EHScopeStack::Cleanup { ConsumeARCParameter(llvm::Value *param, ARCPreciseLifetime_t precise) : Param(param), Precise(precise) {} llvm::Value *Param; ARCPreciseLifetime_t Precise; void Emit(CodeGenFunction &CGF, Flags flags) { CGF.EmitARCRelease(Param, Precise); } }; } /// Emit an alloca (or GlobalValue depending on target) /// for the specified parameter and set up LocalDeclMap. void CodeGenFunction::EmitParmDecl(const VarDecl &D, llvm::Value *Arg, unsigned ArgNo) { // FIXME: Why isn't ImplicitParamDecl a ParmVarDecl? assert((isa(D) || isa(D)) && "Invalid argument to EmitParmDecl"); Arg->setName(D.getName()); QualType Ty = D.getType(); // Use better IR generation for certain implicit parameters. if (isa(D)) { // The only implicit argument a block has is its literal. if (BlockInfo) { LocalDeclMap[&D] = Arg; llvm::Value *LocalAddr = 0; if (CGM.getCodeGenOpts().OptimizationLevel == 0) { // Allocate a stack slot to let the debug info survive the RA. llvm::AllocaInst *Alloc = CreateTempAlloca(ConvertTypeForMem(Ty), D.getName() + ".addr"); Alloc->setAlignment(getContext().getDeclAlign(&D).getQuantity()); LValue lv = MakeAddrLValue(Alloc, Ty, getContext().getDeclAlign(&D)); EmitStoreOfScalar(Arg, lv, /* isInitialization */ true); LocalAddr = Builder.CreateLoad(Alloc); } if (CGDebugInfo *DI = getDebugInfo()) { if (CGM.getCodeGenOpts().getDebugInfo() >= CodeGenOptions::LimitedDebugInfo) { DI->setLocation(D.getLocation()); DI->EmitDeclareOfBlockLiteralArgVariable(*BlockInfo, Arg, LocalAddr, Builder); } } return; } } llvm::Value *DeclPtr; bool HasNonScalarEvalKind = !CodeGenFunction::hasScalarEvaluationKind(Ty); // If this is an aggregate or variable sized value, reuse the input pointer. if (HasNonScalarEvalKind || !Ty->isConstantSizeType()) { DeclPtr = Arg; // Push a destructor cleanup for this parameter if the ABI requires it. if (HasNonScalarEvalKind && getTarget().getCXXABI().isArgumentDestroyedByCallee()) { if (const CXXRecordDecl *RD = Ty->getAsCXXRecordDecl()) { if (RD->hasNonTrivialDestructor()) pushDestroy(QualType::DK_cxx_destructor, DeclPtr, Ty); } } } else { // Otherwise, create a temporary to hold the value. llvm::AllocaInst *Alloc = CreateTempAlloca(ConvertTypeForMem(Ty), D.getName() + ".addr"); CharUnits Align = getContext().getDeclAlign(&D); Alloc->setAlignment(Align.getQuantity()); DeclPtr = Alloc; bool doStore = true; Qualifiers qs = Ty.getQualifiers(); LValue lv = MakeAddrLValue(DeclPtr, Ty, Align); if (Qualifiers::ObjCLifetime lt = qs.getObjCLifetime()) { // We honor __attribute__((ns_consumed)) for types with lifetime. // For __strong, it's handled by just skipping the initial retain; // otherwise we have to balance out the initial +1 with an extra // cleanup to do the release at the end of the function. bool isConsumed = D.hasAttr(); // 'self' is always formally __strong, but if this is not an // init method then we don't want to retain it. if (D.isARCPseudoStrong()) { const ObjCMethodDecl *method = cast(CurCodeDecl); assert(&D == method->getSelfDecl()); assert(lt == Qualifiers::OCL_Strong); assert(qs.hasConst()); assert(method->getMethodFamily() != OMF_init); (void) method; lt = Qualifiers::OCL_ExplicitNone; } if (lt == Qualifiers::OCL_Strong) { if (!isConsumed) { if (CGM.getCodeGenOpts().OptimizationLevel == 0) { // use objc_storeStrong(&dest, value) for retaining the // object. But first, store a null into 'dest' because // objc_storeStrong attempts to release its old value. llvm::Value *Null = CGM.EmitNullConstant(D.getType()); EmitStoreOfScalar(Null, lv, /* isInitialization */ true); EmitARCStoreStrongCall(lv.getAddress(), Arg, true); doStore = false; } else // Don't use objc_retainBlock for block pointers, because we // don't want to Block_copy something just because we got it // as a parameter. Arg = EmitARCRetainNonBlock(Arg); } } else { // Push the cleanup for a consumed parameter. if (isConsumed) { ARCPreciseLifetime_t precise = (D.hasAttr() ? ARCPreciseLifetime : ARCImpreciseLifetime); EHStack.pushCleanup(getARCCleanupKind(), Arg, precise); } if (lt == Qualifiers::OCL_Weak) { EmitARCInitWeak(DeclPtr, Arg); doStore = false; // The weak init is a store, no need to do two. } } // Enter the cleanup scope. EmitAutoVarWithLifetime(*this, D, DeclPtr, lt); } // Store the initial value into the alloca. if (doStore) EmitStoreOfScalar(Arg, lv, /* isInitialization */ true); } llvm::Value *&DMEntry = LocalDeclMap[&D]; assert(DMEntry == 0 && "Decl already exists in localdeclmap!"); DMEntry = DeclPtr; // Emit debug info for param declaration. if (CGDebugInfo *DI = getDebugInfo()) { if (CGM.getCodeGenOpts().getDebugInfo() >= CodeGenOptions::LimitedDebugInfo) { DI->EmitDeclareOfArgVariable(&D, DeclPtr, ArgNo, Builder); } } if (D.hasAttr()) EmitVarAnnotations(&D, DeclPtr); } @ 1.1.1.1 log @Import Clang 3.4rc1 r195771. @ text @@ 1.1.1.2 log @Import clang 3.5svn r198450. @ text @d826 1 a826 1 /// local variable. Does not emit initialization or destruction. d1650 1 a1650 1 getTarget().getCXXABI().areArgsDestroyedLeftToRightInCallee()) { @ 1.1.1.3 log @Import Clang 3.5svn r201163. @ text @d947 1 a947 1 pushStackRestore(NormalCleanup, Stack); a1346 4 void CodeGenFunction::pushStackRestore(CleanupKind Kind, llvm::Value *SPMem) { EHStack.pushCleanup(Kind, SPMem); } d1606 1 a1606 1 bool ArgIsPointer, unsigned ArgNo) { d1644 3 a1646 6 bool DoStore = false; bool IsScalar = hasScalarEvaluationKind(Ty); CharUnits Align = getContext().getDeclAlign(&D); // If we already have a pointer to the argument, reuse the input pointer. if (ArgIsPointer) { assert(isa(Arg->getType())); d1649 1 a1649 1 if (!IsScalar && d1651 4 a1654 3 const CXXRecordDecl *RD = Ty->getAsCXXRecordDecl(); if (RD && RD->hasNonTrivialDestructor()) pushDestroy(QualType::DK_cxx_destructor, DeclPtr, Ty); d1660 1 a1662 2 DoStore = true; } d1664 2 a1665 2 LValue lv = MakeAddrLValue(DeclPtr, Ty, Align); if (IsScalar) { d1667 1 d1696 1 a1696 1 DoStore = false; d1715 1 a1715 1 DoStore = false; // The weak init is a store, no need to do two. d1722 4 a1727 4 // Store the initial value into the alloca. if (DoStore) EmitStoreOfScalar(Arg, lv, /* isInitialization */ true); @ 1.1.1.3.2.1 log @Rebase. @ text @d129 1 a129 1 CGM.getLLVMLinkageVarDefinition(&D, /*isConstant=*/false); d131 9 a139 3 // FIXME: We need to force the emission/use of a guard variable for // some variables even if we can constant-evaluate them because // we can't guarantee every translation unit will constant-evaluate them. d186 1 a186 1 llvm::Constant * d206 1 a206 1 CGM.EmitNullConstant(D.getType()), Name, nullptr, a214 7 // Make sure the result is of the correct type. unsigned ExpectedAddrSpace = CGM.getContext().getTargetAddressSpace(Ty); if (AddrSpace != ExpectedAddrSpace) { llvm::PointerType *PTy = llvm::PointerType::get(LTy, ExpectedAddrSpace); return llvm::ConstantExpr::getAddrSpaceCast(GV, PTy); } d293 1 a293 1 assert(!DMEntry && "Decl already exists in localdeclmap!"); d301 6 a306 2 if (!addr) addr = CreateStaticVarDecl(D, ".", Linkage); a321 2 llvm::GlobalVariable *var = cast(addr->stripPointerCasts()); d335 1 a335 1 CGM.addUsedGlobal(var); d342 1 a342 2 llvm::Constant *castedAddr = llvm::ConstantExpr::getPointerBitCastOrAddrSpaceCast(var, expectedType); d368 1 a368 1 void Emit(CodeGenFunction &CGF, Flags flags) override { d387 1 a387 1 void Emit(CodeGenFunction &CGF, Flags flags) override { d391 1 a391 1 llvm::BasicBlock *SkipDtorBB = nullptr; d413 1 a413 1 void Emit(CodeGenFunction &CGF, Flags flags) override { d424 1 a424 1 void Emit(CodeGenFunction &CGF, Flags flags) override { d444 1 a444 1 void Emit(CodeGenFunction &CGF, Flags flags) override { d476 1 a476 1 void Emit(CodeGenFunction &CGF, Flags flags) override { d533 3 a535 2 for (const auto &I : block->captures()) { if (I.getVariable() == &var) d574 1 a574 4 if (const CXXDefaultInitExpr *DIE = dyn_cast(init)) init = DIE->getExpr(); d616 1 a616 1 llvm::Value *value = nullptr; d869 1 a869 1 emission.Address = nullptr; // signal this condition to later callbacks d952 1 a952 1 std::tie(elementCount, elementType) = getVLASize(Ty); d964 1 a964 1 assert(!DMEntry && "Decl already exists in localdeclmap!"); d993 3 a995 2 for (const auto &I : block->captures()) { if (I.getVariable() == &var) d1005 3 a1007 2 for (const auto *BI : CS->body()) if (const auto *E = dyn_cast(BI)) { d1011 1 a1011 1 else if (const auto *DS = dyn_cast(BI)) { d1013 4 a1016 3 for (const auto *I : DS->decls()) { if (const auto *VD = dyn_cast((I))) { const Expr *Init = VD->getInit(); d1087 1 a1087 1 llvm::Constant *constant = nullptr; d1214 1 a1214 1 CodeGenFunction::Destroyer *destroyer = nullptr; d1512 1 a1512 1 void Emit(CodeGenFunction &CGF, Flags flags) override { d1534 1 a1534 1 void Emit(CodeGenFunction &CGF, Flags flags) override { d1601 1 a1601 1 void Emit(CodeGenFunction &CGF, Flags flags) override { d1624 1 a1624 1 llvm::Value *LocalAddr = nullptr; d1653 2 a1654 5 // If we have a prettier pointer type at this point, bitcast to that. unsigned AS = cast(Arg->getType())->getAddressSpace(); llvm::Type *IRTy = ConvertTypeForMem(Ty)->getPointerTo(AS); DeclPtr = Arg->getType() == IRTy ? Arg : Builder.CreateBitCast(Arg, IRTy, D.getName()); d1735 1 a1735 1 assert(!DMEntry && "Decl already exists in localdeclmap!"); @ 1.1.1.4 log @Import Clang 3.5svn r209886. @ text @d129 1 a129 1 CGM.getLLVMLinkageVarDefinition(&D, /*isConstant=*/false); d131 9 a139 3 // FIXME: We need to force the emission/use of a guard variable for // some variables even if we can constant-evaluate them because // we can't guarantee every translation unit will constant-evaluate them. d186 1 a186 1 llvm::Constant * d206 1 a206 1 CGM.EmitNullConstant(D.getType()), Name, nullptr, a214 7 // Make sure the result is of the correct type. unsigned ExpectedAddrSpace = CGM.getContext().getTargetAddressSpace(Ty); if (AddrSpace != ExpectedAddrSpace) { llvm::PointerType *PTy = llvm::PointerType::get(LTy, ExpectedAddrSpace); return llvm::ConstantExpr::getAddrSpaceCast(GV, PTy); } d293 1 a293 1 assert(!DMEntry && "Decl already exists in localdeclmap!"); d301 6 a306 2 if (!addr) addr = CreateStaticVarDecl(D, ".", Linkage); a321 2 llvm::GlobalVariable *var = cast(addr->stripPointerCasts()); d335 1 a335 1 CGM.addUsedGlobal(var); d342 1 a342 2 llvm::Constant *castedAddr = llvm::ConstantExpr::getPointerBitCastOrAddrSpaceCast(var, expectedType); d368 1 a368 1 void Emit(CodeGenFunction &CGF, Flags flags) override { d387 1 a387 1 void Emit(CodeGenFunction &CGF, Flags flags) override { d391 1 a391 1 llvm::BasicBlock *SkipDtorBB = nullptr; d413 1 a413 1 void Emit(CodeGenFunction &CGF, Flags flags) override { d424 1 a424 1 void Emit(CodeGenFunction &CGF, Flags flags) override { d444 1 a444 1 void Emit(CodeGenFunction &CGF, Flags flags) override { d476 1 a476 1 void Emit(CodeGenFunction &CGF, Flags flags) override { d533 3 a535 2 for (const auto &I : block->captures()) { if (I.getVariable() == &var) d574 1 a574 4 if (const CXXDefaultInitExpr *DIE = dyn_cast(init)) init = DIE->getExpr(); d616 1 a616 1 llvm::Value *value = nullptr; d869 1 a869 1 emission.Address = nullptr; // signal this condition to later callbacks d952 1 a952 1 std::tie(elementCount, elementType) = getVLASize(Ty); d964 1 a964 1 assert(!DMEntry && "Decl already exists in localdeclmap!"); d993 3 a995 2 for (const auto &I : block->captures()) { if (I.getVariable() == &var) d1005 3 a1007 2 for (const auto *BI : CS->body()) if (const auto *E = dyn_cast(BI)) { d1011 1 a1011 1 else if (const auto *DS = dyn_cast(BI)) { d1013 4 a1016 3 for (const auto *I : DS->decls()) { if (const auto *VD = dyn_cast((I))) { const Expr *Init = VD->getInit(); d1087 1 a1087 1 llvm::Constant *constant = nullptr; d1214 1 a1214 1 CodeGenFunction::Destroyer *destroyer = nullptr; d1512 1 a1512 1 void Emit(CodeGenFunction &CGF, Flags flags) override { d1534 1 a1534 1 void Emit(CodeGenFunction &CGF, Flags flags) override { d1601 1 a1601 1 void Emit(CodeGenFunction &CGF, Flags flags) override { d1624 1 a1624 1 llvm::Value *LocalAddr = nullptr; d1653 2 a1654 5 // If we have a prettier pointer type at this point, bitcast to that. unsigned AS = cast(Arg->getType())->getAddressSpace(); llvm::Type *IRTy = ConvertTypeForMem(Ty)->getPointerTo(AS); DeclPtr = Arg->getType() == IRTy ? Arg : Builder.CreateBitCast(Arg, IRTy, D.getName()); d1735 1 a1735 1 assert(!DMEntry && "Decl already exists in localdeclmap!"); @ 1.1.1.5 log @Import clang 3.6svn r215315. @ text @d149 2 a150 1 static std::string GetStaticDeclName(CodeGenFunction &CGF, const VarDecl &D) { d152 4 d157 1 a157 4 if (CGF.getLangOpts().CPlusPlus) return CGM.getMangledName(&D).str(); StringRef ContextName; d162 5 a166 2 if (const BlockDecl *BD = dyn_cast(DC)) ContextName = CGM.getBlockMangledName(GlobalDecl(), BD); d169 4 a172 3 } else if (const FunctionDecl *FD = dyn_cast(CGF.CurFuncDecl)) ContextName = CGM.getMangledName(FD); else if (isa(CGF.CurFuncDecl)) d177 1 a177 1 return ContextName.str() + "." + D.getNameAsString(); d182 1 d192 1 a192 1 Name = GetStaticDeclName(*this, D); a208 7 if (D.isExternallyVisible()) { if (D.hasAttr()) GV->setDLLStorageClass(llvm::GlobalVariable::DLLImportStorageClass); else if (D.hasAttr()) GV->setDLLStorageClass(llvm::GlobalVariable::DLLExportStorageClass); } d303 1 a303 1 addr = CreateStaticVarDecl(D, Linkage); a345 2 CGM.getSanitizerMetadata()->reportGlobalToASan(var, D); d803 3 d1131 1 a1131 1 std::string Name = GetStaticDeclName(*this, D); d1638 1 a1638 2 DI->EmitDeclareOfBlockLiteralArgVariable(*BlockInfo, Arg, ArgNo, LocalAddr, Builder); d1658 1 a1658 3 // Don't push a cleanup in a thunk for a method that will also emit a // cleanup. if (!IsScalar && !CurFuncIsThunk && @ 1.1.1.5.2.1 log @Update LLVM to 3.6.1, requested by joerg in ticket 824. @ text @d149 4 a152 2 static std::string getStaticDeclName(CodeGenModule &CGM, const VarDecl &D) { if (CGM.getLangOpts().CPlusPlus) d155 10 a164 5 // If this isn't C++, we don't need a mangled name, just a pretty one. assert(!D.isExternallyVisible() && "name shouldn't matter"); std::string ContextName; const DeclContext *DC = D.getDeclContext(); if (const auto *FD = dyn_cast(DC)) d166 2 a167 4 else if (const auto *BD = dyn_cast(DC)) ContextName = CGM.getBlockMangledName(GlobalDecl(), BD); else if (const auto *OMD = dyn_cast(DC)) ContextName = OMD->getSelector().getAsString(); d171 1 a171 2 ContextName += "." + D.getNameAsString(); return ContextName; d174 3 a176 9 llvm::Constant *CodeGenModule::getOrCreateStaticVarDecl( const VarDecl &D, llvm::GlobalValue::LinkageTypes Linkage) { // In general, we don't always emit static var decls once before we reference // them. It is possible to reference them before emitting the function that // contains them, and it is possible to emit the containing function multiple // times. if (llvm::Constant *ExistingGV = StaticLocalDeclMap[&D]) return ExistingGV; d183 1 a183 1 Name = getMangledName(&D); d185 1 a185 1 Name = getStaticDeclName(*this, D); d187 1 a187 1 llvm::Type *LTy = getTypes().ConvertTypeForMem(Ty); d189 1 a189 9 GetGlobalVarAddressSpace(&D, getContext().getTargetAddressSpace(Ty)); // Local address space cannot have an initializer. llvm::Constant *Init = nullptr; if (Ty.getAddressSpace() != LangAS::opencl_local) Init = EmitNullConstant(Ty); else Init = llvm::UndefValue::get(LTy); d191 1 a191 1 new llvm::GlobalVariable(getModule(), LTy, d193 1 a193 1 Init, Name, nullptr, d197 1 a197 1 setGlobalVisibility(GV, &D); d200 1 a200 1 setTLSMode(GV, D); d210 1 a210 2 unsigned ExpectedAddrSpace = getContext().getTargetAddressSpace(Ty); llvm::Constant *Addr = GV; d213 1 a213 1 Addr = llvm::ConstantExpr::getAddrSpaceCast(GV, PTy); d216 1 a216 31 setStaticLocalDeclAddress(&D, Addr); // Ensure that the static local gets initialized by making sure the parent // function gets emitted eventually. const Decl *DC = cast(D.getDeclContext()); // We can't name blocks or captured statements directly, so try to emit their // parents. if (isa(DC) || isa(DC)) { DC = DC->getNonClosureContext(); // FIXME: Ensure that global blocks get emitted. if (!DC) return Addr; } GlobalDecl GD; if (const auto *CD = dyn_cast(DC)) GD = GlobalDecl(CD, Ctor_Base); else if (const auto *DD = dyn_cast(DC)) GD = GlobalDecl(DD, Dtor_Base); else if (const auto *FD = dyn_cast(DC)) GD = GlobalDecl(FD); else { // Don't do anything for Obj-C method decls or global closures. We should // never defer them. assert(isa(DC) && "unexpected parent code decl"); } if (GD.getDecl()) (void)GetAddrOfGlobal(GD); return Addr; d299 5 a303 1 llvm::Constant *addr = CGM.getOrCreateStaticVarDecl(D, Linkage); d308 1 d563 4 a566 2 void CodeGenFunction::EmitScalarInit(const Expr *init, const ValueDecl *D, LValue lvalue, bool capturedByInit) { d1036 1 a1036 1 bool CodeGenFunction::isTrivialInitializer(const Expr *Init) { a1055 1 ApplyDebugLocation DL(*this, D.getLocation()); d1130 1 a1130 1 std::string Name = getStaticDeclName(CGM, D); d1159 4 a1162 2 void CodeGenFunction::EmitExprAsInit(const Expr *init, const ValueDecl *D, LValue lvalue, bool capturedByInit) { @ 1.1.1.6 log @Import Clang 3.6RC1 r227398. @ text @d149 4 a152 2 static std::string getStaticDeclName(CodeGenModule &CGM, const VarDecl &D) { if (CGM.getLangOpts().CPlusPlus) d155 10 a164 5 // If this isn't C++, we don't need a mangled name, just a pretty one. assert(!D.isExternallyVisible() && "name shouldn't matter"); std::string ContextName; const DeclContext *DC = D.getDeclContext(); if (const auto *FD = dyn_cast(DC)) d166 2 a167 4 else if (const auto *BD = dyn_cast(DC)) ContextName = CGM.getBlockMangledName(GlobalDecl(), BD); else if (const auto *OMD = dyn_cast(DC)) ContextName = OMD->getSelector().getAsString(); d171 1 a171 2 ContextName += "." + D.getNameAsString(); return ContextName; d174 3 a176 9 llvm::Constant *CodeGenModule::getOrCreateStaticVarDecl( const VarDecl &D, llvm::GlobalValue::LinkageTypes Linkage) { // In general, we don't always emit static var decls once before we reference // them. It is possible to reference them before emitting the function that // contains them, and it is possible to emit the containing function multiple // times. if (llvm::Constant *ExistingGV = StaticLocalDeclMap[&D]) return ExistingGV; d183 1 a183 1 Name = getMangledName(&D); d185 1 a185 1 Name = getStaticDeclName(*this, D); d187 1 a187 1 llvm::Type *LTy = getTypes().ConvertTypeForMem(Ty); d189 1 a189 9 GetGlobalVarAddressSpace(&D, getContext().getTargetAddressSpace(Ty)); // Local address space cannot have an initializer. llvm::Constant *Init = nullptr; if (Ty.getAddressSpace() != LangAS::opencl_local) Init = EmitNullConstant(Ty); else Init = llvm::UndefValue::get(LTy); d191 1 a191 1 new llvm::GlobalVariable(getModule(), LTy, d193 1 a193 1 Init, Name, nullptr, d197 1 a197 1 setGlobalVisibility(GV, &D); d200 1 a200 1 setTLSMode(GV, D); d210 1 a210 2 unsigned ExpectedAddrSpace = getContext().getTargetAddressSpace(Ty); llvm::Constant *Addr = GV; d213 1 a213 1 Addr = llvm::ConstantExpr::getAddrSpaceCast(GV, PTy); d216 1 a216 31 setStaticLocalDeclAddress(&D, Addr); // Ensure that the static local gets initialized by making sure the parent // function gets emitted eventually. const Decl *DC = cast(D.getDeclContext()); // We can't name blocks or captured statements directly, so try to emit their // parents. if (isa(DC) || isa(DC)) { DC = DC->getNonClosureContext(); // FIXME: Ensure that global blocks get emitted. if (!DC) return Addr; } GlobalDecl GD; if (const auto *CD = dyn_cast(DC)) GD = GlobalDecl(CD, Ctor_Base); else if (const auto *DD = dyn_cast(DC)) GD = GlobalDecl(DD, Dtor_Base); else if (const auto *FD = dyn_cast(DC)) GD = GlobalDecl(FD); else { // Don't do anything for Obj-C method decls or global closures. We should // never defer them. assert(isa(DC) && "unexpected parent code decl"); } if (GD.getDecl()) (void)GetAddrOfGlobal(GD); return Addr; d299 5 a303 1 llvm::Constant *addr = CGM.getOrCreateStaticVarDecl(D, Linkage); d308 1 d563 4 a566 2 void CodeGenFunction::EmitScalarInit(const Expr *init, const ValueDecl *D, LValue lvalue, bool capturedByInit) { d1036 1 a1036 1 bool CodeGenFunction::isTrivialInitializer(const Expr *Init) { a1055 1 ApplyDebugLocation DL(*this, D.getLocation()); d1130 1 a1130 1 std::string Name = getStaticDeclName(CGM, D); d1159 4 a1162 2 void CodeGenFunction::EmitExprAsInit(const Expr *init, const ValueDecl *D, LValue lvalue, bool capturedByInit) { @ 1.1.1.7 log @Import Clang 3.8.0rc3 r261930. @ text @a14 2 #include "CGBlocks.h" #include "CGCleanup.h" a35 1 case Decl::BuiltinTemplate: a36 1 case Decl::ExternCContext: a79 1 case Decl::ObjCTypeParam: d142 1 a142 1 if (D.getType().getAddressSpace() == LangAS::opencl_local) a156 2 if (auto *CD = dyn_cast(DC)) DC = cast(CD->getNonClosureContext()); a208 3 if (supportsCOMDAT() && GV->isWeakForLinker()) GV->setComdat(TheModule.getOrInsertComdat(GV->getName())); a305 1 GV->setComdat(OldGV->getComdat()); d334 3 a340 1 CharUnits alignment = getContext().getDeclAlign(&D); d344 1 a344 1 setAddrOfLocalVar(&D, Address(addr, alignment)); d361 1 a361 1 var->setAlignment(alignment.getQuantity()); d379 1 a379 2 if (var != castedAddr) LocalDeclMap.find(&D)->second = Address(castedAddr, alignment); d394 2 a395 2 struct DestroyObject final : EHScopeStack::Cleanup { DestroyObject(Address addr, QualType type, d401 1 a401 1 Address addr; d415 2 a416 2 struct DestroyNRVOVariable final : EHScopeStack::Cleanup { DestroyNRVOVariable(Address addr, d423 1 a423 1 Address Loc; d434 1 a434 2 llvm::Value *DidNRVO = CGF.Builder.CreateFlagLoad(NRVOFlag, "nrvo.val"); d448 3 a450 3 struct CallStackRestore final : EHScopeStack::Cleanup { Address Stack; CallStackRestore(Address Stack) : Stack(Stack) {} d458 1 a458 1 struct ExtendGCLifetime final : EHScopeStack::Cleanup { d473 1 a473 1 struct CallCleanupFunction final : EHScopeStack::Cleanup { d487 1 a487 1 llvm::Value *Addr = CGF.EmitDeclRefLValue(&DRE).getPointer(); d507 1 a507 1 class CallLifetimeEnd final : public EHScopeStack::Cleanup { d511 2 a512 2 CallLifetimeEnd(Address addr, llvm::Value *size) : Addr(addr.getPointer()), Size(size) {} d515 4 a518 1 CGF.EmitLifetimeEnd(Size, Addr); d526 1 a526 1 Address addr, d578 3 a580 3 for (const Stmt *SubStmt : s->children()) // SubStmt might be null; as in missing decl or conditional of an if-stmt. if (SubStmt && isAccessedBy(var, SubStmt)) a592 51 static bool tryEmitARCCopyWeakInit(CodeGenFunction &CGF, const LValue &destLV, const Expr *init) { bool needsCast = false; while (auto castExpr = dyn_cast(init->IgnoreParens())) { switch (castExpr->getCastKind()) { // Look through casts that don't require representation changes. case CK_NoOp: case CK_BitCast: case CK_BlockPointerToObjCPointerCast: needsCast = true; break; // If we find an l-value to r-value cast from a __weak variable, // emit this operation as a copy or move. case CK_LValueToRValue: { const Expr *srcExpr = castExpr->getSubExpr(); if (srcExpr->getType().getObjCLifetime() != Qualifiers::OCL_Weak) return false; // Emit the source l-value. LValue srcLV = CGF.EmitLValue(srcExpr); // Handle a formal type change to avoid asserting. auto srcAddr = srcLV.getAddress(); if (needsCast) { srcAddr = CGF.Builder.CreateElementBitCast(srcAddr, destLV.getAddress().getElementType()); } // If it was an l-value, use objc_copyWeak. if (srcExpr->getValueKind() == VK_LValue) { CGF.EmitARCCopyWeak(destLV.getAddress(), srcAddr); } else { assert(srcExpr->getValueKind() == VK_XValue); CGF.EmitARCMoveWeak(destLV.getAddress(), srcAddr); } return true; } // Stop at anything else. default: return false; } init = castExpr->getSubExpr(); continue; } return false; } d596 1 a596 1 lvalue.setAddress(CGF.emitBlockByrefAddress(lvalue.getAddress(), var)); d634 2 a635 3 tempLV.setAddress(emitBlockByrefAddress(tempLV.getAddress(), cast(D), /*follow*/ false)); d638 4 a641 1 auto ty = cast(tempLV.getAddress().getElementType()); a670 6 // If it's not accessed by the initializer, try to emit the // initialization with a copy or move. if (!accessedByInit && tryEmitARCCopyWeakInit(*this, lvalue, init)) { return; } d785 1 a785 1 Builder.CreateDefaultAlignedStore(Init, Loc, isVolatile); d796 2 a797 3 emitStoresForInitAfterMemset( Elt, Builder.CreateConstGEP2_32(Init->getType(), Loc, 0, i), isVolatile, Builder); d810 2 a811 3 emitStoresForInitAfterMemset( Elt, Builder.CreateConstGEP2_32(Init->getType(), Loc, 0, i), isVolatile, Builder); d836 15 a859 29 /// Emit a lifetime.begin marker if some criteria are satisfied. /// \return a pointer to the temporary size Value if a marker was emitted, null /// otherwise llvm::Value *CodeGenFunction::EmitLifetimeStart(uint64_t Size, llvm::Value *Addr) { // For now, only in optimized builds. if (CGM.getCodeGenOpts().OptimizationLevel == 0) return nullptr; // Disable lifetime markers in msan builds. // FIXME: Remove this when msan works with lifetime markers. if (getLangOpts().Sanitize.has(SanitizerKind::Memory)) return nullptr; llvm::Value *SizeV = llvm::ConstantInt::get(Int64Ty, Size); Addr = Builder.CreateBitCast(Addr, Int8PtrTy); llvm::CallInst *C = Builder.CreateCall(CGM.getLLVMLifetimeStartFn(), {SizeV, Addr}); C->setDoesNotThrow(); return SizeV; } void CodeGenFunction::EmitLifetimeEnd(llvm::Value *Size, llvm::Value *Addr) { Addr = Builder.CreateBitCast(Addr, Int8PtrTy); llvm::CallInst *C = Builder.CreateCall(CGM.getLLVMLifetimeEndFn(), {Size, Addr}); C->setDoesNotThrow(); } d872 1 d878 1 a878 1 Address address = Address::invalid(); d904 1 a904 2 // Signal this condition to later callbacks. emission.Addr = Address::invalid(); d915 1 d921 1 a921 1 address = ReturnValue; d929 1 a929 2 Address NRVOFlag = CreateTempAlloca(Zero->getType(), CharUnits::One(), "nrvo"); d934 2 a935 2 NRVOFlags[&D] = NRVOFlag.getPointer(); emission.NRVOFlag = NRVOFlag.getPointer(); d939 5 a943 10 CharUnits allocaAlignment; llvm::Type *allocaTy; if (isByRef) { auto &byrefInfo = getBlockByrefInfo(&D); allocaTy = byrefInfo.Type; allocaAlignment = byrefInfo.ByrefAlignment; } else { allocaTy = ConvertTypeForMem(Ty); allocaAlignment = alignment; } d945 6 a950 11 // Create the alloca. Note that we set the name separately from // building the instruction so that it's there even in no-asserts // builds. address = CreateTempAlloca(allocaTy, allocaAlignment); address.getPointer()->setName(D.getName()); // Don't emit lifetime markers for MSVC catch parameters. The lifetime of // the catch parameter starts in the catchpad instruction, and we can't // insert code in those basic blocks. bool IsMSCatchParam = D.isExceptionVariable() && getTarget().getCXXABI().isMicrosoft(); d954 8 a961 4 if (HaveInsertPoint() && !IsMSCatchParam) { uint64_t size = CGM.getDataLayout().getTypeAllocSize(allocaTy); emission.SizeForLifetimeMarkers = EmitLifetimeStart(size, address.getPointer()); d971 1 a971 2 Address Stack = CreateTempAlloca(Int8PtrTy, getPointerAlign(), "saved_stack"); d975 1 d995 1 a995 1 address = Address(vla, alignment); d998 4 a1001 2 setAddrOfLocalVar(&D, address); emission.Addr = address; d1009 1 a1009 1 DI->EmitDeclareOfAutoVariable(&D, address.getPointer(), Builder); d1014 1 a1014 1 EmitVarAnnotations(&D, address.getPointer()); d1061 2 a1062 2 for (const Stmt *SubStmt : e->children()) if (isCapturedBy(var, cast(SubStmt))) d1090 1 a1090 1 auto DL = ApplyDebugLocation::CreateDefaultArtificial(*this, D.getLocation()); d1110 2 d1117 2 a1118 2 Address Loc = capturedByInit ? emission.Addr : emission.getObjectAddress(*this); d1127 1 a1127 1 LValue lv = MakeAddrLValue(Loc, type); d1134 1 a1134 1 LValue lv = MakeAddrLValue(Loc, type); d1148 1 a1148 1 if (Loc.getType() != BP) d1156 1 a1156 1 isVolatile); d1160 1 a1160 2 emitStoresForInitAfterMemset(constant, Loc.getPointer(), isVolatile, Builder); d1170 1 a1170 1 GV->setAlignment(Loc.getAlignment().getQuantity()); d1173 2 a1174 2 Address SrcPtr = Address(GV, Loc.getAlignment()); if (SrcPtr.getType() != BP) d1177 2 a1178 1 Builder.CreateMemCpy(Loc, SrcPtr, SizeVal, isVolatile); d1239 1 a1239 1 Address addr = emission.getObjectAddress(*this); d1257 2 a1258 2 EHStack.pushCleanup(cleanupKind, addr, dtor, emission.NRVOFlag); a1306 2 EHCleanupScope &cleanup = cast(*EHStack.begin()); cleanup.setLifetimeMarker(); d1353 1 a1353 1 Address addr, QualType type) { d1363 1 a1363 1 Address addr, QualType type) { d1371 1 a1371 1 void CodeGenFunction::pushDestroy(CleanupKind cleanupKind, Address addr, d1378 1 a1378 1 void CodeGenFunction::pushStackRestore(CleanupKind Kind, Address SPMem) { d1383 1 a1383 1 CleanupKind cleanupKind, Address addr, QualType type, d1413 1 a1413 1 void CodeGenFunction::emitDestroy(Address addr, QualType type, d1420 2 a1421 5 llvm::Value *length = emitArrayLength(arrayType, type, addr); CharUnits elementAlign = addr.getAlignment() .alignmentOfArrayElement(getContext().getTypeSizeInChars(type)); a1432 1 llvm::Value *begin = addr.getPointer(); d1434 1 a1434 1 emitArrayDestroy(begin, end, type, elementAlign, destroyer, d1443 1 a1443 1 /// \param elementType - the element type of the array d1450 1 a1450 2 QualType elementType, CharUnits elementAlign, d1454 1 a1454 1 assert(!elementType->isArrayType()); d1480 1 a1480 2 pushRegularPartialArrayCleanup(begin, element, elementType, elementAlign, destroyer); d1483 1 a1483 1 destroyer(*this, Address(element, elementAlign), elementType); d1501 1 a1501 1 QualType type, CharUnits elementAlign, d1513 1 a1513 1 llvm::Value *zero = llvm::ConstantInt::get(CGF.SizeTy, 0); d1515 1 a1515 1 SmallVector gepIndices(arrayDepth+1, zero); d1523 1 a1523 1 CGF.emitArrayDestroy(begin, end, type, elementAlign, destroyer, d1531 1 a1531 1 class RegularPartialArrayDestroy final : public EHScopeStack::Cleanup { a1535 1 CharUnits ElementAlign; d1538 1 a1538 1 QualType elementType, CharUnits elementAlign, d1541 1 a1541 2 ElementType(elementType), Destroyer(destroyer), ElementAlign(elementAlign) {} d1545 1 a1545 1 ElementType, ElementAlign, Destroyer); d1552 1 a1552 1 class IrregularPartialArrayDestroy final : public EHScopeStack::Cleanup { d1554 1 a1554 1 Address ArrayEndPointer; a1556 1 CharUnits ElementAlign; d1559 1 a1559 1 Address arrayEndPointer, a1560 1 CharUnits elementAlign, d1563 1 a1563 2 ElementType(elementType), Destroyer(destroyer), ElementAlign(elementAlign) {} d1568 1 a1568 1 ElementType, ElementAlign, Destroyer); d1580 1 a1580 1 Address arrayEndPointer, a1581 1 CharUnits elementAlign, d1585 1 a1585 2 elementType, elementAlign, destroyer); a1596 1 CharUnits elementAlign, d1600 1 a1600 2 elementType, elementAlign, destroyer); d1624 1 a1624 1 struct ConsumeARCParameter final : EHScopeStack::Cleanup { d1640 2 a1641 2 void CodeGenFunction::EmitParmDecl(const VarDecl &D, ParamValue Arg, unsigned ArgNo) { d1646 1 a1646 1 Arg.getAnyValue()->setName(D.getName()); d1651 1 a1651 1 if (auto IPD = dyn_cast(&D)) { a1652 1 // We assume this is always passed directly. d1654 21 a1674 1 setBlockContextParameter(IPD, ArgNo, Arg.getDirectValue()); d1679 1 a1679 1 Address DeclPtr = Address::invalid(); d1682 1 d1684 1 a1684 2 if (Arg.isIndirect()) { DeclPtr = Arg.getIndirectAddress(); d1686 1 a1686 1 unsigned AS = DeclPtr.getType()->getAddressSpace(); d1688 2 a1689 3 if (DeclPtr.getType() != IRTy) DeclPtr = Builder.CreateBitCast(DeclPtr, IRTy, D.getName()); d1701 4 a1704 2 DeclPtr = CreateMemTemp(Ty, getContext().getDeclAlign(&D), D.getName() + ".addr"); d1708 1 a1708 3 llvm::Value *ArgVal = (DoStore ? Arg.getDirectValue() : nullptr); LValue lv = MakeAddrLValue(DeclPtr, Ty); d1738 1 a1738 1 EmitARCStoreStrongCall(lv.getAddress(), ArgVal, true); d1745 1 a1745 1 ArgVal = EmitARCRetainNonBlock(ArgVal); d1752 1 a1752 1 EHStack.pushCleanup(getARCCleanupKind(), ArgVal, d1757 1 a1757 1 EmitARCInitWeak(DeclPtr, ArgVal); d1769 1 a1769 1 EmitStoreOfScalar(ArgVal, lv, /* isInitialization */ true); d1771 3 a1773 1 setAddrOfLocalVar(&D, DeclPtr); d1779 1 a1779 1 DI->EmitDeclareOfArgVariable(&D, DeclPtr.getPointer(), ArgNo, Builder); d1784 1 a1784 1 EmitVarAnnotations(&D, DeclPtr.getPointer()); @ 1.1.1.7.2.1 log @Sync with HEAD @ text @a15 1 #include "CGCXXABI.h" a18 1 #include "CGOpenMPRuntime.h" a23 1 #include "clang/AST/DeclOpenMP.h" a31 1 d35 1 a73 2 case Decl::PragmaComment: case Decl::PragmaDetectMismatch: a75 1 case Decl::Export: a83 1 case Decl::ConstructorUsingShadow: a84 1 case Decl::Binding: a94 1 case Decl::OMPCapturedExpr: a106 4 case Decl::UsingPack: for (auto *Using : cast(D).expansions()) EmitDecl(*Using); return; d111 1 a111 2 case Decl::Var: case Decl::Decomposition: { d115 1 a115 6 EmitVarDecl(VD); if (auto *DD = dyn_cast(&VD)) for (auto *B : DD->bindings()) if (auto *HD = B->getHoldingVar()) EmitVarDecl(*HD); return; a117 3 case Decl::OMPDeclareReduction: return CGM.EmitOMPDeclareReduction(cast(&D), this); d292 1 a292 1 else if (HaveInsertPoint()) { d333 1 a333 1 if (hasNontrivialDestruction(D.getType()) && HaveInsertPoint()) { a365 7 // CUDA's local and local static __shared__ variables should not // have any non-empty initializers. This is ensured by Sema. // Whatever initializer such variable may have when it gets here is // a no-op and should not be emitted. bool isCudaSharedVar = getLangOpts().CUDA && getLangOpts().CUDAIsDevice && D.hasAttr(); d367 1 a367 1 if (D.getInit() && !isCudaSharedVar) d397 1 a397 1 CGM.getCodeGenOpts().getDebugInfo() >= codegenoptions::LimitedDebugInfo) { d513 1 a513 2 auto Callee = CGCallee::forDirect(CleanupFn); CGF.EmitCall(FnInfo, Callee, ReturnValueSlot(), Args); d516 14 a529 1 } // end anonymous namespace d647 1 d668 1 a668 1 d671 1 a671 1 d699 1 a699 1 llvm::Value *zero = CGM.getNullPointer(ty, tempLV.getType()); d718 2 a719 1 value = EmitARCUnsafeUnretainedScalarExpr(init); d767 31 d822 1 a822 1 d851 3 a853 3 if (llvm::ConstantDataSequential *CDS = dyn_cast(Init)) { d880 1 d915 7 a921 1 if (!ShouldEmitLifetimeMarkers) d978 2 a979 6 // Exception is if a variable is located in non-constant address space // in OpenCL. if ((!getLangOpts().OpenCL || Ty.getAddressSpace() == LangAS::opencl_constant) && (CGM.getCodeGenOpts().MergeAllConstants && !NRVO && !isByRef && CGM.isTypeConstant(Ty, true))) { d1041 2 a1042 2 // Emit a lifetime intrinsic if meaningful. There's no point in doing this // if we don't have a valid insertion point (?). d1044 3 a1046 9 // goto or switch-case statements can break lifetime into several // regions which need more efforts to handle them correctly. PR28267 // This is rare case, but it's better just omit intrinsics than have // them incorrectly placed. if (!Bypasses.IsBypassed(&D)) { uint64_t size = CGM.getDataLayout().getTypeAllocSize(allocaTy); emission.SizeForLifetimeMarkers = EmitLifetimeStart(size, address.getPointer()); } d1089 2 a1090 2 if (CGM.getCodeGenOpts().getDebugInfo() >= codegenoptions::LimitedDebugInfo) { a1165 1 a1247 5 unsigned AS = 0; if (getLangOpts().OpenCL) { AS = CGM.getContext().getTargetAddressSpace(LangAS::opencl_constant); BP = llvm::PointerType::getInt8PtrTy(getLLVMContext(), AS); } d1251 1 a1251 2 constant, Name, nullptr, llvm::GlobalValue::NotThreadLocal, AS); d1253 1 a1253 1 GV->setUnnamedAddr(llvm::GlobalValue::UnnamedAddr::Global); d1384 2 a1385 2 if (emission.useLifetimeMarkers()) EHStack.pushCleanup(NormalEHLifetimeMarker, d1388 3 d1665 1 a1665 1 } // end anonymous namespace d1734 1 a1734 1 } // end anonymous namespace a1755 18 // Apply any prologue 'this' adjustments required by the ABI. Be careful to // handle the case where 'this' is passed indirectly as part of an inalloca // struct. if (const CXXMethodDecl *MD = dyn_cast_or_null(CurCodeDecl)) { if (MD->isVirtual() && IPD == CXXABIThisDecl) { llvm::Value *This = Arg.isIndirect() ? Builder.CreateLoad(Arg.getIndirectAddress()) : Arg.getDirectValue(); This = CGM.getCXXABI().adjustThisParameterInVirtualFunctionPrologue( *this, CurGD, This); if (Arg.isIndirect()) Builder.CreateStore(This, Arg.getIndirectAddress()); else Arg = ParamValue::forDirect(This); } } d1855 2 a1856 2 if (CGM.getCodeGenOpts().getDebugInfo() >= codegenoptions::LimitedDebugInfo) { a1863 7 void CodeGenModule::EmitOMPDeclareReduction(const OMPDeclareReductionDecl *D, CodeGenFunction *CGF) { if (!LangOpts.OpenMP || (!LangOpts.EmitAllDecls && !D->isUsed())) return; getOpenMPRuntime().emitUserDefinedReduction(CGF, D); } @ 1.1.1.8 log @Import Clang pre-4.0.0 r291444. @ text @a15 1 #include "CGCXXABI.h" a18 1 #include "CGOpenMPRuntime.h" a23 1 #include "clang/AST/DeclOpenMP.h" a31 1 d35 1 a73 2 case Decl::PragmaComment: case Decl::PragmaDetectMismatch: a75 1 case Decl::Export: a83 1 case Decl::ConstructorUsingShadow: a84 1 case Decl::Binding: a94 1 case Decl::OMPCapturedExpr: a106 4 case Decl::UsingPack: for (auto *Using : cast(D).expansions()) EmitDecl(*Using); return; d111 1 a111 2 case Decl::Var: case Decl::Decomposition: { d115 1 a115 6 EmitVarDecl(VD); if (auto *DD = dyn_cast(&VD)) for (auto *B : DD->bindings()) if (auto *HD = B->getHoldingVar()) EmitVarDecl(*HD); return; a117 3 case Decl::OMPDeclareReduction: return CGM.EmitOMPDeclareReduction(cast(&D), this); a365 7 // CUDA's local and local static __shared__ variables should not // have any non-empty initializers. This is ensured by Sema. // Whatever initializer such variable may have when it gets here is // a no-op and should not be emitted. bool isCudaSharedVar = getLangOpts().CUDA && getLangOpts().CUDAIsDevice && D.hasAttr(); d367 1 a367 1 if (D.getInit() && !isCudaSharedVar) d397 1 a397 1 CGM.getCodeGenOpts().getDebugInfo() >= codegenoptions::LimitedDebugInfo) { d513 1 a513 2 auto Callee = CGCallee::forDirect(CleanupFn); CGF.EmitCall(FnInfo, Callee, ReturnValueSlot(), Args); d516 14 a529 1 } // end anonymous namespace d647 1 d668 1 a668 1 d671 1 a671 1 d699 1 a699 1 llvm::Value *zero = CGM.getNullPointer(ty, tempLV.getType()); d718 2 a719 1 value = EmitARCUnsafeUnretainedScalarExpr(init); d767 31 d822 1 a822 1 d851 3 a853 3 if (llvm::ConstantDataSequential *CDS = dyn_cast(Init)) { d880 1 d915 7 a921 1 if (!ShouldEmitLifetimeMarkers) d978 2 a979 6 // Exception is if a variable is located in non-constant address space // in OpenCL. if ((!getLangOpts().OpenCL || Ty.getAddressSpace() == LangAS::opencl_constant) && (CGM.getCodeGenOpts().MergeAllConstants && !NRVO && !isByRef && CGM.isTypeConstant(Ty, true))) { d1041 2 a1042 2 // Emit a lifetime intrinsic if meaningful. There's no point in doing this // if we don't have a valid insertion point (?). d1044 3 a1046 9 // goto or switch-case statements can break lifetime into several // regions which need more efforts to handle them correctly. PR28267 // This is rare case, but it's better just omit intrinsics than have // them incorrectly placed. if (!Bypasses.IsBypassed(&D)) { uint64_t size = CGM.getDataLayout().getTypeAllocSize(allocaTy); emission.SizeForLifetimeMarkers = EmitLifetimeStart(size, address.getPointer()); } d1089 2 a1090 2 if (CGM.getCodeGenOpts().getDebugInfo() >= codegenoptions::LimitedDebugInfo) { a1165 1 a1247 5 unsigned AS = 0; if (getLangOpts().OpenCL) { AS = CGM.getContext().getTargetAddressSpace(LangAS::opencl_constant); BP = llvm::PointerType::getInt8PtrTy(getLLVMContext(), AS); } d1251 1 a1251 2 constant, Name, nullptr, llvm::GlobalValue::NotThreadLocal, AS); d1253 1 a1253 1 GV->setUnnamedAddr(llvm::GlobalValue::UnnamedAddr::Global); d1384 2 a1385 2 if (emission.useLifetimeMarkers()) EHStack.pushCleanup(NormalEHLifetimeMarker, d1388 3 d1665 1 a1665 1 } // end anonymous namespace d1734 1 a1734 1 } // end anonymous namespace a1755 18 // Apply any prologue 'this' adjustments required by the ABI. Be careful to // handle the case where 'this' is passed indirectly as part of an inalloca // struct. if (const CXXMethodDecl *MD = dyn_cast_or_null(CurCodeDecl)) { if (MD->isVirtual() && IPD == CXXABIThisDecl) { llvm::Value *This = Arg.isIndirect() ? Builder.CreateLoad(Arg.getIndirectAddress()) : Arg.getDirectValue(); This = CGM.getCXXABI().adjustThisParameterInVirtualFunctionPrologue( *this, CurGD, This); if (Arg.isIndirect()) Builder.CreateStore(This, Arg.getIndirectAddress()); else Arg = ParamValue::forDirect(This); } } d1855 2 a1856 2 if (CGM.getCodeGenOpts().getDebugInfo() >= codegenoptions::LimitedDebugInfo) { a1863 7 void CodeGenModule::EmitOMPDeclareReduction(const OMPDeclareReductionDecl *D, CodeGenFunction *CGF) { if (!LangOpts.OpenMP || (!LangOpts.EmitAllDecls && !D->isUsed())) return; getOpenMPRuntime().emitUserDefinedReduction(CGF, D); } @ 1.1.1.8.2.1 log @Sync with HEAD @ text @d314 1 a314 1 else if (HaveInsertPoint()) { d355 1 a355 1 if (hasNontrivialDestruction(D.getType()) && HaveInsertPoint()) { @ 1.1.1.9 log @Import Clang 4.0RC1 r294123. @ text @d314 1 a314 1 else if (HaveInsertPoint()) { d355 1 a355 1 if (hasNontrivialDestruction(D.getType()) && HaveInsertPoint()) { @ 1.1.1.10 log @Import clang r309604 from branches/release_50 @ text @d14 1 a20 1 #include "CodeGenFunction.h" a21 1 #include "TargetInfo.h" a52 1 case Decl::CXXDeductionGuide: d154 1 a154 8 if (D.hasExternalStorage()) // Don't emit it now, allow it to be emitted lazily on its first use. return; // Some function-scope variable does not have static storage but still // needs to be emitted like a static variable, e.g. a function-scope // variable in constant address space in OpenCL. if (D.getStorageDuration() != SD_Automatic) { d165 4 d219 2 a220 2 unsigned AS = GetGlobalVarAddressSpace(&D); unsigned TargetAS = getContext().getTargetAddressSpace(AS); d229 6 a234 3 llvm::GlobalVariable *GV = new llvm::GlobalVariable( getModule(), LTy, Ty.isConstant(getContext()), Linkage, Init, Name, nullptr, llvm::GlobalVariable::NotThreadLocal, TargetAS); d252 1 a252 1 unsigned ExpectedAS = Ty.getAddressSpace(); d254 3 a256 4 if (AS != ExpectedAS) { Addr = getTargetCodeGenInfo().performAddrSpaceCast( *this, GV, AS, ExpectedAS, LTy->getPointerTo(getContext().getTargetAddressSpace(ExpectedAS))); a403 7 if (auto *SA = D.getAttr()) var->addAttribute("bss-section", SA->getName()); if (auto *SA = D.getAttr()) var->addAttribute("data-section", SA->getName()); if (auto *SA = D.getAttr()) var->addAttribute("rodata-section", SA->getName()); a673 21 void CodeGenFunction::EmitNullabilityCheck(LValue LHS, llvm::Value *RHS, SourceLocation Loc) { if (!SanOpts.has(SanitizerKind::NullabilityAssign)) return; auto Nullability = LHS.getType()->getNullability(getContext()); if (!Nullability || *Nullability != NullabilityKind::NonNull) return; // Check if the right hand side of the assignment is nonnull, if the left // hand side must be nonnull. SanitizerScope SanScope(this); llvm::Value *IsNotNull = Builder.CreateIsNotNull(RHS); llvm::Constant *StaticData[] = { EmitCheckSourceLocation(Loc), EmitCheckTypeDescriptor(LHS.getType()), llvm::ConstantInt::get(Int8Ty, 0), // The LogAlignment info is unused. llvm::ConstantInt::get(Int8Ty, TCK_NonnullAssign)}; EmitCheck({{IsNotNull, SanitizerKind::NullabilityAssign}}, SanitizerHandler::TypeMismatch, StaticData, RHS); } a680 1 EmitNullabilityCheck(lvalue, value, init->getExprLoc()); a768 2 EmitNullabilityCheck(lvalue, value, init->getExprLoc()); d902 1 a902 1 Addr = Builder.CreateBitCast(Addr, AllocaInt8PtrTy); d910 1 a910 1 Addr = Builder.CreateBitCast(Addr, AllocaInt8PtrTy); a920 1 assert(Ty.getAddressSpace() == LangAS::Default); d1013 2 a1014 1 address = CreateTempAlloca(allocaTy, allocaAlignment, D.getName()); d1025 5 a1029 15 // If there's a jump into the lifetime of this variable, its lifetime // gets broken up into several regions in IR, which requires more work // to handle correctly. For now, just omit the intrinsics; this is a // rare case, and it's better to just be conservatively correct. // PR28267. // // We have to do this in all language modes if there's a jump past the // declaration. We also have to do it in C if there's a jump to an // earlier point in the current block because non-VLA lifetimes begin as // soon as the containing block is entered, not when its variables // actually come into scope; suppressing the lifetime annotations // completely in this case is unnecessarily pessimistic, but again, this // is rare. if (!Bypasses.IsBypassed(&D) && !(!getLangOpts().CPlusPlus && hasLabelBeenSeenInCurrentScope())) { d1064 4 a1067 1 address = CreateTempAlloca(llvmTy, alignment, "vla", elementCount); a1085 6 // Make sure we call @@llvm.lifetime.end. if (emission.useLifetimeMarkers()) EHStack.pushCleanup(NormalEHLifetimeMarker, emission.getAllocatedAddress(), emission.getSizeForLifetimeMarkers()); d1376 7 d1694 1 a1694 2 if (LifetimeStartFn) return LifetimeStartFn; d1696 1 a1696 1 llvm::Intrinsic::lifetime_start, AllocaInt8PtrTy); d1702 1 a1702 2 if (LifetimeEndFn) return LifetimeEndFn; d1704 1 a1704 1 llvm::Intrinsic::lifetime_end, AllocaInt8PtrTy); a1818 4 // Load objects passed indirectly. if (Arg.isIndirect() && !ArgVal) ArgVal = Builder.CreateLoad(DeclPtr); a1871 13 // We can only check return value nullability if all arguments to the // function satisfy their nullability preconditions. This makes it necessary // to emit null checks for args in the function body itself. if (requiresReturnValueNullabilityCheck()) { auto Nullability = Ty->getNullability(getContext()); if (Nullability && *Nullability == NullabilityKind::NonNull) { SanitizerScope SanScope(this); RetValNullabilityPrecondition = Builder.CreateAnd(RetValNullabilityPrecondition, Builder.CreateIsNotNull(Arg.getAnyValue())); } } @ 1.1.1.10.4.1 log @Sync with HEAD @ text @a21 1 #include "ConstantEmitter.h" a163 4 // Static sampler variables translated to function calls. if (D.getType()->isSamplerT()) return; d224 1 a224 1 LangAS AS = GetGlobalVarAddressSpace(&D); d227 1 a227 2 // OpenCL variables in local address space and CUDA shared // variables cannot have an initializer. d229 3 a231 2 if (Ty.getAddressSpace() == LangAS::opencl_local || D.hasAttr()) a232 2 else Init = EmitNullConstant(Ty); d238 1 d246 6 a251 1 setGVProperties(GV, &D); d254 1 a254 1 LangAS ExpectedAS = Ty.getAddressSpace(); d289 1 a289 3 if (GD.getDecl()) { // Disable emission of the parent function for the OpenMP device codegen. CGOpenMPRuntime::DisableAutoDeclareTargetRAII NoDeclTarget(*this); a290 1 } d310 1 a310 2 ConstantEmitter emitter(*this); llvm::Constant *Init = emitter.tryEmitForInitializer(D); a340 1 GV->setDSOLocal(OldGV->isDSOLocal()); a357 2 emitter.finalize(GV); d464 5 a468 4 template struct DestroyNRVOVariable : EHScopeStack::Cleanup { DestroyNRVOVariable(Address addr, llvm::Value *NRVOFlag) : NRVOFlag(NRVOFlag), Loc(addr) {} d470 1 a488 18 static_cast(this)->emitDestructorCall(CGF); if (NRVO) CGF.EmitBlock(SkipDtorBB); } virtual ~DestroyNRVOVariable() = default; }; struct DestroyNRVOVariableCXX final : DestroyNRVOVariable { DestroyNRVOVariableCXX(Address addr, const CXXDestructorDecl *Dtor, llvm::Value *NRVOFlag) : DestroyNRVOVariable(addr, NRVOFlag), Dtor(Dtor) {} const CXXDestructorDecl *Dtor; void emitDestructorCall(CodeGenFunction &CGF) { d491 2 a492 3 /*Delegating=*/false, Loc); } }; d494 1 a494 9 struct DestroyNRVOVariableC final : DestroyNRVOVariable { DestroyNRVOVariableC(Address addr, llvm::Value *NRVOFlag, QualType Ty) : DestroyNRVOVariable(addr, NRVOFlag), Ty(Ty) {} QualType Ty; void emitDestructorCall(CodeGenFunction &CGF) { CGF.destroyNonTrivialCStruct(CGF, Loc, Ty); d858 2 a859 4 static void emitStoresForInitAfterMemset(CodeGenModule &CGM, llvm::Constant *Init, Address Loc, bool isVolatile, CGBuilderTy &Builder) { d866 1 a866 1 Builder.CreateStore(Init, Loc, isVolatile); d878 1 a878 2 CGM, Elt, Builder.CreateConstInBoundsGEP2_32(Loc, 0, i, CGM.getDataLayout()), d893 1 a893 2 CGM, Elt, Builder.CreateConstInBoundsGEP2_32(Loc, 0, i, CGM.getDataLayout()), a934 3 assert(Addr->getType()->getPointerAddressSpace() == CGM.getDataLayout().getAllocaAddrSpace() && "Pointer should be in alloca address space"); a943 3 assert(Addr->getType()->getPointerAddressSpace() == CGM.getDataLayout().getAllocaAddrSpace() && "Pointer should be in alloca address space"); a949 53 void CodeGenFunction::EmitAndRegisterVariableArrayDimensions( CGDebugInfo *DI, const VarDecl &D, bool EmitDebugInfo) { // For each dimension stores its QualType and corresponding // size-expression Value. SmallVector Dimensions; // Break down the array into individual dimensions. QualType Type1D = D.getType(); while (getContext().getAsVariableArrayType(Type1D)) { auto VlaSize = getVLAElements1D(Type1D); if (auto *C = dyn_cast(VlaSize.NumElts)) Dimensions.emplace_back(C, Type1D.getUnqualifiedType()); else { auto SizeExprAddr = CreateDefaultAlignTempAlloca( VlaSize.NumElts->getType(), "__vla_expr"); Builder.CreateStore(VlaSize.NumElts, SizeExprAddr); Dimensions.emplace_back(SizeExprAddr.getPointer(), Type1D.getUnqualifiedType()); } Type1D = VlaSize.Type; } if (!EmitDebugInfo) return; // Register each dimension's size-expression with a DILocalVariable, // so that it can be used by CGDebugInfo when instantiating a DISubrange // to describe this array. for (auto &VlaSize : Dimensions) { llvm::Metadata *MD; if (auto *C = dyn_cast(VlaSize.NumElts)) MD = llvm::ConstantAsMetadata::get(C); else { // Create an artificial VarDecl to generate debug info for. IdentifierInfo &NameIdent = getContext().Idents.getOwn( cast(VlaSize.NumElts)->getName()); auto VlaExprTy = VlaSize.NumElts->getType()->getPointerElementType(); auto QT = getContext().getIntTypeForBitwidth( VlaExprTy->getScalarSizeInBits(), false); auto *ArtificialDecl = VarDecl::Create( getContext(), const_cast(D.getDeclContext()), D.getLocation(), D.getLocation(), &NameIdent, QT, getContext().CreateTypeSourceInfo(QT), SC_Auto); ArtificialDecl->setImplicit(); MD = DI->EmitDeclareOfAutoVariable(ArtificialDecl, VlaSize.NumElts, Builder); } assert(MD && "No Size expression debug node created"); DI->registerVLASizeExpression(VlaSize.Type, MD); } } d955 1 a955 3 assert( Ty.getAddressSpace() == LangAS::Default || (Ty.getAddressSpace() == LangAS::opencl_private && getLangOpts().OpenCL)); a967 4 auto *DI = getDebugInfo(); bool EmitDebugInfo = DI && CGM.getCodeGenOpts().getDebugInfo() >= codegenoptions::LimitedDebugInfo; a968 1 Address AllocaAddr = Address::invalid(); d1009 3 a1011 11 // unless: // - it's an NRVO variable. // - we are compiling OpenMP and it's an OpenMP local variable. Address OpenMPLocalAddr = getLangOpts().OpenMP ? CGM.getOpenMPRuntime().getAddressOfLocalVariable(*this, &D) : Address::invalid(); if (getLangOpts().OpenMP && OpenMPLocalAddr.isValid()) { address = OpenMPLocalAddr; } else if (NRVO) { d1018 1 a1018 4 const auto *RD = RecordTy->getDecl(); const auto *CXXRD = dyn_cast(RD); if ((CXXRD && !CXXRD->hasTrivialDestructor()) || RD->isNonTrivialToPrimitiveDestroy()) { d1048 1 a1048 2 address = CreateTempAlloca(allocaTy, allocaAlignment, D.getName(), /*ArraySize=*/nullptr, &AllocaAddr); d1076 1 a1076 1 EmitLifetimeStart(size, AllocaAddr.getPointer()); d1101 5 a1105 2 auto VlaSize = getVLASize(Ty); llvm::Type *llvmTy = ConvertTypeForMem(VlaSize.Type); d1108 1 a1108 7 address = CreateTempAlloca(llvmTy, alignment, "vla", VlaSize.NumElts, &AllocaAddr); // If we have debug info enabled, properly describe the VLA dimensions for // this type by registering the vla size expression for each of the // dimensions. EmitAndRegisterVariableArrayDimensions(DI, D, EmitDebugInfo); a1112 1 emission.AllocaAddr = AllocaAddr; d1115 8 a1122 4 if (EmitDebugInfo && HaveInsertPoint()) { DI->setLocation(D.getLocation()); (void)DI->EmitDeclareOfAutoVariable(&D, address.getPointer(), Builder); } d1130 1 a1130 1 emission.getOriginalAllocatedAddress(), a1135 13 static bool isCapturedBy(const VarDecl &, const Expr *); /// Determines whether the given __block variable is potentially /// captured by the given statement. static bool isCapturedBy(const VarDecl &Var, const Stmt *S) { if (const Expr *E = dyn_cast(S)) return isCapturedBy(Var, E); for (const Stmt *SubStmt : S->children()) if (isCapturedBy(Var, SubStmt)) return true; return false; } d1138 1 a1138 1 static bool isCapturedBy(const VarDecl &Var, const Expr *E) { d1141 1 a1141 1 E = E->IgnoreParenCasts(); d1143 4 a1146 4 if (const BlockExpr *BE = dyn_cast(E)) { const BlockDecl *Block = BE->getBlockDecl(); for (const auto &I : Block->captures()) { if (I.getVariable() == &Var) d1154 1 a1154 1 if (const StmtExpr *SE = dyn_cast(E)) { d1157 3 a1159 3 if (const auto *BIE = dyn_cast(BI)) { if (isCapturedBy(Var, BIE)) return true; d1166 1 a1166 1 if (Init && isCapturedBy(Var, Init)) d1178 2 a1179 2 for (const Stmt *SubStmt : E->children()) if (isCapturedBy(Var, SubStmt)) d1185 1 a1185 1 /// Determine whether the given initializer is trivial in the sense a1224 13 // Initialize the variable here if it doesn't have a initializer and it is a // C struct that is non-trivial to initialize or an array containing such a // struct. if (!Init && type.isNonTrivialToPrimitiveDefaultInitialize() == QualType::PDIK_Struct) { LValue Dst = MakeAddrLValue(emission.getAllocatedAddress(), type); if (emission.IsByRef) drillIntoBlockVariable(*this, Dst, &D); defaultInitNonTrivialCStructVar(Dst); return; } d1239 1 a1239 1 constant = ConstantEmitter(*this).tryEmitAbstractForInitializer(D); d1263 1 a1263 1 llvm::Type *BP = CGM.Int8Ty->getPointerTo(Loc.getAddressSpace()); d1275 3 a1277 3 Loc = Builder.CreateBitCast(Loc, constant->getType()->getPointerTo(Loc.getAddressSpace())); emitStoresForInitAfterMemset(CGM, constant, Loc, isVolatile, Builder); d1283 5 a1287 4 unsigned AS = CGM.getContext().getTargetAddressSpace( CGM.getStringLiteralAddressSpace()); BP = llvm::PointerType::getInt8PtrTy(getLLVMContext(), AS); d1304 3 a1306 3 /// Emit an expression as an initializer for an object (variable, field, etc.) /// at the given location. The expression is not necessarily the normal /// initializer for the object, and the address is not necessarily d1310 1 a1310 1 /// \param D the object to act as if we're initializing d1312 1 a1312 1 /// to the LLVM mapping of the object's type d1314 1 a1314 1 /// \param capturedByInit true if \p D is a __block variable a1341 5 AggValueSlot::Overlap_t Overlap = AggValueSlot::MayOverlap; if (isa(D)) Overlap = AggValueSlot::DoesNotOverlap; else if (auto *FD = dyn_cast(D)) Overlap = overlapForFieldInit(FD); d1346 1 a1346 2 AggValueSlot::IsNotAliased, Overlap)); d1379 2 a1380 2 EHStack.pushCleanup(cleanupKind, addr, dtor, emission.NRVOFlag); a1398 10 case QualType::DK_nontrivial_c_struct: destroyer = CodeGenFunction::destroyNonTrivialCStruct; if (emission.NRVOFlag) { assert(!type->isArrayType()); EHStack.pushCleanup(cleanupKind, addr, emission.NRVOFlag, type); return; } break; a1459 2 case QualType::DK_nontrivial_c_struct: return destroyNonTrivialCStruct; d1784 1 a1784 1 // This may be passed as an inalloca'ed value on Windows x86. d1786 1 a1786 4 llvm::Value *V = Arg.isIndirect() ? Builder.CreateLoad(Arg.getIndirectAddress()) : Arg.getDirectValue(); setBlockContextParameter(IPD, ArgNo, V); d1789 18 a1819 16 // Indirect argument is in alloca address space, which may be different // from the default address space. auto AllocaAS = CGM.getASTAllocaAddressSpace(); auto *V = DeclPtr.getPointer(); auto SrcLangAS = getLangOpts().OpenCL ? LangAS::opencl_private : AllocaAS; auto DestLangAS = getLangOpts().OpenCL ? LangAS::opencl_private : LangAS::Default; if (SrcLangAS != DestLangAS) { assert(getContext().getTargetAddressSpace(SrcLangAS) == CGM.getDataLayout().getAllocaAddrSpace()); auto DestAS = getContext().getTargetAddressSpace(DestLangAS); auto *T = V->getType()->getPointerElementType()->getPointerTo(DestAS); DeclPtr = Address(getTargetHooks().performAddrSpaceCast( *this, V, SrcLangAS, DestLangAS, T, true), DeclPtr.getAlignment()); } d1824 5 a1828 10 if (hasAggregateEvaluationKind(Ty) && !CurFuncIsThunk && Ty->getAs()->getDecl()->isParamDestroyedInCallee()) { if (QualType::DestructionKind DtorKind = Ty.isDestructedType()) { assert((DtorKind == QualType::DK_cxx_destructor || DtorKind == QualType::DK_nontrivial_c_struct) && "unexpected destructor type"); pushDestroy(DtorKind, DeclPtr, Ty); CalleeDestructedParamCleanups[cast(&D)] = EHStack.stable_begin(); } d1831 3 a1833 12 // Check if the parameter address is controlled by OpenMP runtime. Address OpenMPLocalAddr = getLangOpts().OpenMP ? CGM.getOpenMPRuntime().getAddressOfLocalVariable(*this, &D) : Address::invalid(); if (getLangOpts().OpenMP && OpenMPLocalAddr.isValid()) { DeclPtr = OpenMPLocalAddr; } else { // Otherwise, create a temporary to hold the value. DeclPtr = CreateMemTemp(Ty, getContext().getDeclAlign(&D), D.getName() + ".addr"); } @ 1.1.1.10.4.2 log @Mostly merge changes from HEAD upto 20200411 @ text @@ 1.1.1.10.2.1 log @Sync with HEAD @ text @a21 1 #include "ConstantEmitter.h" a163 4 // Static sampler variables translated to function calls. if (D.getType()->isSamplerT()) return; d224 1 a224 1 LangAS AS = GetGlobalVarAddressSpace(&D); d227 1 a227 2 // OpenCL variables in local address space and CUDA shared // variables cannot have an initializer. d229 3 a231 2 if (Ty.getAddressSpace() == LangAS::opencl_local || D.hasAttr()) a232 2 else Init = EmitNullConstant(Ty); d238 1 d246 6 a251 1 setGVProperties(GV, &D); d254 1 a254 1 LangAS ExpectedAS = Ty.getAddressSpace(); d289 1 a289 3 if (GD.getDecl()) { // Disable emission of the parent function for the OpenMP device codegen. CGOpenMPRuntime::DisableAutoDeclareTargetRAII NoDeclTarget(*this); a290 1 } d310 1 a310 2 ConstantEmitter emitter(*this); llvm::Constant *Init = emitter.tryEmitForInitializer(D); a340 1 GV->setDSOLocal(OldGV->isDSOLocal()); a357 2 emitter.finalize(GV); d464 5 a468 4 template struct DestroyNRVOVariable : EHScopeStack::Cleanup { DestroyNRVOVariable(Address addr, llvm::Value *NRVOFlag) : NRVOFlag(NRVOFlag), Loc(addr) {} d470 1 a488 18 static_cast(this)->emitDestructorCall(CGF); if (NRVO) CGF.EmitBlock(SkipDtorBB); } virtual ~DestroyNRVOVariable() = default; }; struct DestroyNRVOVariableCXX final : DestroyNRVOVariable { DestroyNRVOVariableCXX(Address addr, const CXXDestructorDecl *Dtor, llvm::Value *NRVOFlag) : DestroyNRVOVariable(addr, NRVOFlag), Dtor(Dtor) {} const CXXDestructorDecl *Dtor; void emitDestructorCall(CodeGenFunction &CGF) { d491 2 a492 3 /*Delegating=*/false, Loc); } }; d494 1 a494 9 struct DestroyNRVOVariableC final : DestroyNRVOVariable { DestroyNRVOVariableC(Address addr, llvm::Value *NRVOFlag, QualType Ty) : DestroyNRVOVariable(addr, NRVOFlag), Ty(Ty) {} QualType Ty; void emitDestructorCall(CodeGenFunction &CGF) { CGF.destroyNonTrivialCStruct(CGF, Loc, Ty); d858 2 a859 4 static void emitStoresForInitAfterMemset(CodeGenModule &CGM, llvm::Constant *Init, Address Loc, bool isVolatile, CGBuilderTy &Builder) { d866 1 a866 1 Builder.CreateStore(Init, Loc, isVolatile); d878 1 a878 2 CGM, Elt, Builder.CreateConstInBoundsGEP2_32(Loc, 0, i, CGM.getDataLayout()), d893 1 a893 2 CGM, Elt, Builder.CreateConstInBoundsGEP2_32(Loc, 0, i, CGM.getDataLayout()), a934 3 assert(Addr->getType()->getPointerAddressSpace() == CGM.getDataLayout().getAllocaAddrSpace() && "Pointer should be in alloca address space"); a943 3 assert(Addr->getType()->getPointerAddressSpace() == CGM.getDataLayout().getAllocaAddrSpace() && "Pointer should be in alloca address space"); a949 53 void CodeGenFunction::EmitAndRegisterVariableArrayDimensions( CGDebugInfo *DI, const VarDecl &D, bool EmitDebugInfo) { // For each dimension stores its QualType and corresponding // size-expression Value. SmallVector Dimensions; // Break down the array into individual dimensions. QualType Type1D = D.getType(); while (getContext().getAsVariableArrayType(Type1D)) { auto VlaSize = getVLAElements1D(Type1D); if (auto *C = dyn_cast(VlaSize.NumElts)) Dimensions.emplace_back(C, Type1D.getUnqualifiedType()); else { auto SizeExprAddr = CreateDefaultAlignTempAlloca( VlaSize.NumElts->getType(), "__vla_expr"); Builder.CreateStore(VlaSize.NumElts, SizeExprAddr); Dimensions.emplace_back(SizeExprAddr.getPointer(), Type1D.getUnqualifiedType()); } Type1D = VlaSize.Type; } if (!EmitDebugInfo) return; // Register each dimension's size-expression with a DILocalVariable, // so that it can be used by CGDebugInfo when instantiating a DISubrange // to describe this array. for (auto &VlaSize : Dimensions) { llvm::Metadata *MD; if (auto *C = dyn_cast(VlaSize.NumElts)) MD = llvm::ConstantAsMetadata::get(C); else { // Create an artificial VarDecl to generate debug info for. IdentifierInfo &NameIdent = getContext().Idents.getOwn( cast(VlaSize.NumElts)->getName()); auto VlaExprTy = VlaSize.NumElts->getType()->getPointerElementType(); auto QT = getContext().getIntTypeForBitwidth( VlaExprTy->getScalarSizeInBits(), false); auto *ArtificialDecl = VarDecl::Create( getContext(), const_cast(D.getDeclContext()), D.getLocation(), D.getLocation(), &NameIdent, QT, getContext().CreateTypeSourceInfo(QT), SC_Auto); ArtificialDecl->setImplicit(); MD = DI->EmitDeclareOfAutoVariable(ArtificialDecl, VlaSize.NumElts, Builder); } assert(MD && "No Size expression debug node created"); DI->registerVLASizeExpression(VlaSize.Type, MD); } } d955 1 a955 3 assert( Ty.getAddressSpace() == LangAS::Default || (Ty.getAddressSpace() == LangAS::opencl_private && getLangOpts().OpenCL)); a967 4 auto *DI = getDebugInfo(); bool EmitDebugInfo = DI && CGM.getCodeGenOpts().getDebugInfo() >= codegenoptions::LimitedDebugInfo; a968 1 Address AllocaAddr = Address::invalid(); d1009 3 a1011 11 // unless: // - it's an NRVO variable. // - we are compiling OpenMP and it's an OpenMP local variable. Address OpenMPLocalAddr = getLangOpts().OpenMP ? CGM.getOpenMPRuntime().getAddressOfLocalVariable(*this, &D) : Address::invalid(); if (getLangOpts().OpenMP && OpenMPLocalAddr.isValid()) { address = OpenMPLocalAddr; } else if (NRVO) { d1018 1 a1018 4 const auto *RD = RecordTy->getDecl(); const auto *CXXRD = dyn_cast(RD); if ((CXXRD && !CXXRD->hasTrivialDestructor()) || RD->isNonTrivialToPrimitiveDestroy()) { d1048 1 a1048 2 address = CreateTempAlloca(allocaTy, allocaAlignment, D.getName(), /*ArraySize=*/nullptr, &AllocaAddr); d1076 1 a1076 1 EmitLifetimeStart(size, AllocaAddr.getPointer()); d1101 5 a1105 2 auto VlaSize = getVLASize(Ty); llvm::Type *llvmTy = ConvertTypeForMem(VlaSize.Type); d1108 1 a1108 7 address = CreateTempAlloca(llvmTy, alignment, "vla", VlaSize.NumElts, &AllocaAddr); // If we have debug info enabled, properly describe the VLA dimensions for // this type by registering the vla size expression for each of the // dimensions. EmitAndRegisterVariableArrayDimensions(DI, D, EmitDebugInfo); a1112 1 emission.AllocaAddr = AllocaAddr; d1115 8 a1122 4 if (EmitDebugInfo && HaveInsertPoint()) { DI->setLocation(D.getLocation()); (void)DI->EmitDeclareOfAutoVariable(&D, address.getPointer(), Builder); } d1130 1 a1130 1 emission.getOriginalAllocatedAddress(), a1135 13 static bool isCapturedBy(const VarDecl &, const Expr *); /// Determines whether the given __block variable is potentially /// captured by the given statement. static bool isCapturedBy(const VarDecl &Var, const Stmt *S) { if (const Expr *E = dyn_cast(S)) return isCapturedBy(Var, E); for (const Stmt *SubStmt : S->children()) if (isCapturedBy(Var, SubStmt)) return true; return false; } d1138 1 a1138 1 static bool isCapturedBy(const VarDecl &Var, const Expr *E) { d1141 1 a1141 1 E = E->IgnoreParenCasts(); d1143 4 a1146 4 if (const BlockExpr *BE = dyn_cast(E)) { const BlockDecl *Block = BE->getBlockDecl(); for (const auto &I : Block->captures()) { if (I.getVariable() == &Var) d1154 1 a1154 1 if (const StmtExpr *SE = dyn_cast(E)) { d1157 3 a1159 3 if (const auto *BIE = dyn_cast(BI)) { if (isCapturedBy(Var, BIE)) return true; d1166 1 a1166 1 if (Init && isCapturedBy(Var, Init)) d1178 2 a1179 2 for (const Stmt *SubStmt : E->children()) if (isCapturedBy(Var, SubStmt)) d1185 1 a1185 1 /// Determine whether the given initializer is trivial in the sense a1224 13 // Initialize the variable here if it doesn't have a initializer and it is a // C struct that is non-trivial to initialize or an array containing such a // struct. if (!Init && type.isNonTrivialToPrimitiveDefaultInitialize() == QualType::PDIK_Struct) { LValue Dst = MakeAddrLValue(emission.getAllocatedAddress(), type); if (emission.IsByRef) drillIntoBlockVariable(*this, Dst, &D); defaultInitNonTrivialCStructVar(Dst); return; } d1239 1 a1239 1 constant = ConstantEmitter(*this).tryEmitAbstractForInitializer(D); d1263 1 a1263 1 llvm::Type *BP = CGM.Int8Ty->getPointerTo(Loc.getAddressSpace()); d1275 3 a1277 3 Loc = Builder.CreateBitCast(Loc, constant->getType()->getPointerTo(Loc.getAddressSpace())); emitStoresForInitAfterMemset(CGM, constant, Loc, isVolatile, Builder); d1283 5 a1287 4 unsigned AS = CGM.getContext().getTargetAddressSpace( CGM.getStringLiteralAddressSpace()); BP = llvm::PointerType::getInt8PtrTy(getLLVMContext(), AS); d1304 3 a1306 3 /// Emit an expression as an initializer for an object (variable, field, etc.) /// at the given location. The expression is not necessarily the normal /// initializer for the object, and the address is not necessarily d1310 1 a1310 1 /// \param D the object to act as if we're initializing d1312 1 a1312 1 /// to the LLVM mapping of the object's type d1314 1 a1314 1 /// \param capturedByInit true if \p D is a __block variable a1341 5 AggValueSlot::Overlap_t Overlap = AggValueSlot::MayOverlap; if (isa(D)) Overlap = AggValueSlot::DoesNotOverlap; else if (auto *FD = dyn_cast(D)) Overlap = overlapForFieldInit(FD); d1346 1 a1346 2 AggValueSlot::IsNotAliased, Overlap)); d1379 2 a1380 2 EHStack.pushCleanup(cleanupKind, addr, dtor, emission.NRVOFlag); a1398 10 case QualType::DK_nontrivial_c_struct: destroyer = CodeGenFunction::destroyNonTrivialCStruct; if (emission.NRVOFlag) { assert(!type->isArrayType()); EHStack.pushCleanup(cleanupKind, addr, emission.NRVOFlag, type); return; } break; a1459 2 case QualType::DK_nontrivial_c_struct: return destroyNonTrivialCStruct; d1784 1 a1784 1 // This may be passed as an inalloca'ed value on Windows x86. d1786 1 a1786 4 llvm::Value *V = Arg.isIndirect() ? Builder.CreateLoad(Arg.getIndirectAddress()) : Arg.getDirectValue(); setBlockContextParameter(IPD, ArgNo, V); d1789 18 a1819 16 // Indirect argument is in alloca address space, which may be different // from the default address space. auto AllocaAS = CGM.getASTAllocaAddressSpace(); auto *V = DeclPtr.getPointer(); auto SrcLangAS = getLangOpts().OpenCL ? LangAS::opencl_private : AllocaAS; auto DestLangAS = getLangOpts().OpenCL ? LangAS::opencl_private : LangAS::Default; if (SrcLangAS != DestLangAS) { assert(getContext().getTargetAddressSpace(SrcLangAS) == CGM.getDataLayout().getAllocaAddrSpace()); auto DestAS = getContext().getTargetAddressSpace(DestLangAS); auto *T = V->getType()->getPointerElementType()->getPointerTo(DestAS); DeclPtr = Address(getTargetHooks().performAddrSpaceCast( *this, V, SrcLangAS, DestLangAS, T, true), DeclPtr.getAlignment()); } d1824 5 a1828 10 if (hasAggregateEvaluationKind(Ty) && !CurFuncIsThunk && Ty->getAs()->getDecl()->isParamDestroyedInCallee()) { if (QualType::DestructionKind DtorKind = Ty.isDestructedType()) { assert((DtorKind == QualType::DK_cxx_destructor || DtorKind == QualType::DK_nontrivial_c_struct) && "unexpected destructor type"); pushDestroy(DtorKind, DeclPtr, Ty); CalleeDestructedParamCleanups[cast(&D)] = EHStack.stable_begin(); } d1831 3 a1833 12 // Check if the parameter address is controlled by OpenMP runtime. Address OpenMPLocalAddr = getLangOpts().OpenMP ? CGM.getOpenMPRuntime().getAddressOfLocalVariable(*this, &D) : Address::invalid(); if (getLangOpts().OpenMP && OpenMPLocalAddr.isValid()) { DeclPtr = OpenMPLocalAddr; } else { // Otherwise, create a temporary to hold the value. DeclPtr = CreateMemTemp(Ty, getContext().getDeclAlign(&D), D.getName() + ".addr"); } @ 1.1.1.11 log @Import clang r337282 from trunk @ text @a21 1 #include "ConstantEmitter.h" a163 4 // Static sampler variables translated to function calls. if (D.getType()->isSamplerT()) return; d224 1 a224 1 LangAS AS = GetGlobalVarAddressSpace(&D); d227 1 a227 2 // OpenCL variables in local address space and CUDA shared // variables cannot have an initializer. d229 3 a231 2 if (Ty.getAddressSpace() == LangAS::opencl_local || D.hasAttr()) a232 2 else Init = EmitNullConstant(Ty); d238 1 d246 6 a251 1 setGVProperties(GV, &D); d254 1 a254 1 LangAS ExpectedAS = Ty.getAddressSpace(); d289 1 a289 3 if (GD.getDecl()) { // Disable emission of the parent function for the OpenMP device codegen. CGOpenMPRuntime::DisableAutoDeclareTargetRAII NoDeclTarget(*this); a290 1 } d310 1 a310 2 ConstantEmitter emitter(*this); llvm::Constant *Init = emitter.tryEmitForInitializer(D); a340 1 GV->setDSOLocal(OldGV->isDSOLocal()); a357 2 emitter.finalize(GV); d464 5 a468 4 template struct DestroyNRVOVariable : EHScopeStack::Cleanup { DestroyNRVOVariable(Address addr, llvm::Value *NRVOFlag) : NRVOFlag(NRVOFlag), Loc(addr) {} d470 1 a488 18 static_cast(this)->emitDestructorCall(CGF); if (NRVO) CGF.EmitBlock(SkipDtorBB); } virtual ~DestroyNRVOVariable() = default; }; struct DestroyNRVOVariableCXX final : DestroyNRVOVariable { DestroyNRVOVariableCXX(Address addr, const CXXDestructorDecl *Dtor, llvm::Value *NRVOFlag) : DestroyNRVOVariable(addr, NRVOFlag), Dtor(Dtor) {} const CXXDestructorDecl *Dtor; void emitDestructorCall(CodeGenFunction &CGF) { d491 2 a492 3 /*Delegating=*/false, Loc); } }; d494 1 a494 9 struct DestroyNRVOVariableC final : DestroyNRVOVariable { DestroyNRVOVariableC(Address addr, llvm::Value *NRVOFlag, QualType Ty) : DestroyNRVOVariable(addr, NRVOFlag), Ty(Ty) {} QualType Ty; void emitDestructorCall(CodeGenFunction &CGF) { CGF.destroyNonTrivialCStruct(CGF, Loc, Ty); d858 2 a859 4 static void emitStoresForInitAfterMemset(CodeGenModule &CGM, llvm::Constant *Init, Address Loc, bool isVolatile, CGBuilderTy &Builder) { d866 1 a866 1 Builder.CreateStore(Init, Loc, isVolatile); d878 1 a878 2 CGM, Elt, Builder.CreateConstInBoundsGEP2_32(Loc, 0, i, CGM.getDataLayout()), d893 1 a893 2 CGM, Elt, Builder.CreateConstInBoundsGEP2_32(Loc, 0, i, CGM.getDataLayout()), a934 3 assert(Addr->getType()->getPointerAddressSpace() == CGM.getDataLayout().getAllocaAddrSpace() && "Pointer should be in alloca address space"); a943 3 assert(Addr->getType()->getPointerAddressSpace() == CGM.getDataLayout().getAllocaAddrSpace() && "Pointer should be in alloca address space"); a949 53 void CodeGenFunction::EmitAndRegisterVariableArrayDimensions( CGDebugInfo *DI, const VarDecl &D, bool EmitDebugInfo) { // For each dimension stores its QualType and corresponding // size-expression Value. SmallVector Dimensions; // Break down the array into individual dimensions. QualType Type1D = D.getType(); while (getContext().getAsVariableArrayType(Type1D)) { auto VlaSize = getVLAElements1D(Type1D); if (auto *C = dyn_cast(VlaSize.NumElts)) Dimensions.emplace_back(C, Type1D.getUnqualifiedType()); else { auto SizeExprAddr = CreateDefaultAlignTempAlloca( VlaSize.NumElts->getType(), "__vla_expr"); Builder.CreateStore(VlaSize.NumElts, SizeExprAddr); Dimensions.emplace_back(SizeExprAddr.getPointer(), Type1D.getUnqualifiedType()); } Type1D = VlaSize.Type; } if (!EmitDebugInfo) return; // Register each dimension's size-expression with a DILocalVariable, // so that it can be used by CGDebugInfo when instantiating a DISubrange // to describe this array. for (auto &VlaSize : Dimensions) { llvm::Metadata *MD; if (auto *C = dyn_cast(VlaSize.NumElts)) MD = llvm::ConstantAsMetadata::get(C); else { // Create an artificial VarDecl to generate debug info for. IdentifierInfo &NameIdent = getContext().Idents.getOwn( cast(VlaSize.NumElts)->getName()); auto VlaExprTy = VlaSize.NumElts->getType()->getPointerElementType(); auto QT = getContext().getIntTypeForBitwidth( VlaExprTy->getScalarSizeInBits(), false); auto *ArtificialDecl = VarDecl::Create( getContext(), const_cast(D.getDeclContext()), D.getLocation(), D.getLocation(), &NameIdent, QT, getContext().CreateTypeSourceInfo(QT), SC_Auto); ArtificialDecl->setImplicit(); MD = DI->EmitDeclareOfAutoVariable(ArtificialDecl, VlaSize.NumElts, Builder); } assert(MD && "No Size expression debug node created"); DI->registerVLASizeExpression(VlaSize.Type, MD); } } d955 1 a955 3 assert( Ty.getAddressSpace() == LangAS::Default || (Ty.getAddressSpace() == LangAS::opencl_private && getLangOpts().OpenCL)); a967 4 auto *DI = getDebugInfo(); bool EmitDebugInfo = DI && CGM.getCodeGenOpts().getDebugInfo() >= codegenoptions::LimitedDebugInfo; a968 1 Address AllocaAddr = Address::invalid(); d1009 3 a1011 11 // unless: // - it's an NRVO variable. // - we are compiling OpenMP and it's an OpenMP local variable. Address OpenMPLocalAddr = getLangOpts().OpenMP ? CGM.getOpenMPRuntime().getAddressOfLocalVariable(*this, &D) : Address::invalid(); if (getLangOpts().OpenMP && OpenMPLocalAddr.isValid()) { address = OpenMPLocalAddr; } else if (NRVO) { d1018 1 a1018 4 const auto *RD = RecordTy->getDecl(); const auto *CXXRD = dyn_cast(RD); if ((CXXRD && !CXXRD->hasTrivialDestructor()) || RD->isNonTrivialToPrimitiveDestroy()) { d1048 1 a1048 2 address = CreateTempAlloca(allocaTy, allocaAlignment, D.getName(), /*ArraySize=*/nullptr, &AllocaAddr); d1076 1 a1076 1 EmitLifetimeStart(size, AllocaAddr.getPointer()); d1101 5 a1105 2 auto VlaSize = getVLASize(Ty); llvm::Type *llvmTy = ConvertTypeForMem(VlaSize.Type); d1108 1 a1108 7 address = CreateTempAlloca(llvmTy, alignment, "vla", VlaSize.NumElts, &AllocaAddr); // If we have debug info enabled, properly describe the VLA dimensions for // this type by registering the vla size expression for each of the // dimensions. EmitAndRegisterVariableArrayDimensions(DI, D, EmitDebugInfo); a1112 1 emission.AllocaAddr = AllocaAddr; d1115 8 a1122 4 if (EmitDebugInfo && HaveInsertPoint()) { DI->setLocation(D.getLocation()); (void)DI->EmitDeclareOfAutoVariable(&D, address.getPointer(), Builder); } d1130 1 a1130 1 emission.getOriginalAllocatedAddress(), a1135 13 static bool isCapturedBy(const VarDecl &, const Expr *); /// Determines whether the given __block variable is potentially /// captured by the given statement. static bool isCapturedBy(const VarDecl &Var, const Stmt *S) { if (const Expr *E = dyn_cast(S)) return isCapturedBy(Var, E); for (const Stmt *SubStmt : S->children()) if (isCapturedBy(Var, SubStmt)) return true; return false; } d1138 1 a1138 1 static bool isCapturedBy(const VarDecl &Var, const Expr *E) { d1141 1 a1141 1 E = E->IgnoreParenCasts(); d1143 4 a1146 4 if (const BlockExpr *BE = dyn_cast(E)) { const BlockDecl *Block = BE->getBlockDecl(); for (const auto &I : Block->captures()) { if (I.getVariable() == &Var) d1154 1 a1154 1 if (const StmtExpr *SE = dyn_cast(E)) { d1157 3 a1159 3 if (const auto *BIE = dyn_cast(BI)) { if (isCapturedBy(Var, BIE)) return true; d1166 1 a1166 1 if (Init && isCapturedBy(Var, Init)) d1178 2 a1179 2 for (const Stmt *SubStmt : E->children()) if (isCapturedBy(Var, SubStmt)) d1185 1 a1185 1 /// Determine whether the given initializer is trivial in the sense a1224 13 // Initialize the variable here if it doesn't have a initializer and it is a // C struct that is non-trivial to initialize or an array containing such a // struct. if (!Init && type.isNonTrivialToPrimitiveDefaultInitialize() == QualType::PDIK_Struct) { LValue Dst = MakeAddrLValue(emission.getAllocatedAddress(), type); if (emission.IsByRef) drillIntoBlockVariable(*this, Dst, &D); defaultInitNonTrivialCStructVar(Dst); return; } d1239 1 a1239 1 constant = ConstantEmitter(*this).tryEmitAbstractForInitializer(D); d1263 1 a1263 1 llvm::Type *BP = CGM.Int8Ty->getPointerTo(Loc.getAddressSpace()); d1275 3 a1277 3 Loc = Builder.CreateBitCast(Loc, constant->getType()->getPointerTo(Loc.getAddressSpace())); emitStoresForInitAfterMemset(CGM, constant, Loc, isVolatile, Builder); d1283 5 a1287 4 unsigned AS = CGM.getContext().getTargetAddressSpace( CGM.getStringLiteralAddressSpace()); BP = llvm::PointerType::getInt8PtrTy(getLLVMContext(), AS); d1304 3 a1306 3 /// Emit an expression as an initializer for an object (variable, field, etc.) /// at the given location. The expression is not necessarily the normal /// initializer for the object, and the address is not necessarily d1310 1 a1310 1 /// \param D the object to act as if we're initializing d1312 1 a1312 1 /// to the LLVM mapping of the object's type d1314 1 a1314 1 /// \param capturedByInit true if \p D is a __block variable a1341 5 AggValueSlot::Overlap_t Overlap = AggValueSlot::MayOverlap; if (isa(D)) Overlap = AggValueSlot::DoesNotOverlap; else if (auto *FD = dyn_cast(D)) Overlap = overlapForFieldInit(FD); d1346 1 a1346 2 AggValueSlot::IsNotAliased, Overlap)); d1379 2 a1380 2 EHStack.pushCleanup(cleanupKind, addr, dtor, emission.NRVOFlag); a1398 10 case QualType::DK_nontrivial_c_struct: destroyer = CodeGenFunction::destroyNonTrivialCStruct; if (emission.NRVOFlag) { assert(!type->isArrayType()); EHStack.pushCleanup(cleanupKind, addr, emission.NRVOFlag, type); return; } break; a1459 2 case QualType::DK_nontrivial_c_struct: return destroyNonTrivialCStruct; d1784 1 a1784 1 // This may be passed as an inalloca'ed value on Windows x86. d1786 1 a1786 4 llvm::Value *V = Arg.isIndirect() ? Builder.CreateLoad(Arg.getIndirectAddress()) : Arg.getDirectValue(); setBlockContextParameter(IPD, ArgNo, V); d1789 18 a1819 16 // Indirect argument is in alloca address space, which may be different // from the default address space. auto AllocaAS = CGM.getASTAllocaAddressSpace(); auto *V = DeclPtr.getPointer(); auto SrcLangAS = getLangOpts().OpenCL ? LangAS::opencl_private : AllocaAS; auto DestLangAS = getLangOpts().OpenCL ? LangAS::opencl_private : LangAS::Default; if (SrcLangAS != DestLangAS) { assert(getContext().getTargetAddressSpace(SrcLangAS) == CGM.getDataLayout().getAllocaAddrSpace()); auto DestAS = getContext().getTargetAddressSpace(DestLangAS); auto *T = V->getType()->getPointerElementType()->getPointerTo(DestAS); DeclPtr = Address(getTargetHooks().performAddrSpaceCast( *this, V, SrcLangAS, DestLangAS, T, true), DeclPtr.getAlignment()); } d1824 5 a1828 10 if (hasAggregateEvaluationKind(Ty) && !CurFuncIsThunk && Ty->getAs()->getDecl()->isParamDestroyedInCallee()) { if (QualType::DestructionKind DtorKind = Ty.isDestructedType()) { assert((DtorKind == QualType::DK_cxx_destructor || DtorKind == QualType::DK_nontrivial_c_struct) && "unexpected destructor type"); pushDestroy(DtorKind, DeclPtr, Ty); CalleeDestructedParamCleanups[cast(&D)] = EHStack.stable_begin(); } d1831 3 a1833 12 // Check if the parameter address is controlled by OpenMP runtime. Address OpenMPLocalAddr = getLangOpts().OpenMP ? CGM.getOpenMPRuntime().getAddressOfLocalVariable(*this, &D) : Address::invalid(); if (getLangOpts().OpenMP && OpenMPLocalAddr.isValid()) { DeclPtr = OpenMPLocalAddr; } else { // Otherwise, create a temporary to hold the value. DeclPtr = CreateMemTemp(Ty, getContext().getDeclAlign(&D), D.getName() + ".addr"); } @ 1.1.1.12 log @Mark old LLVM instance as dead. @ text @@ 1.1.1.5.4.1 log @file CGDecl.cpp was added on branch tls-maxphys on 2014-08-19 23:47:27 +0000 @ text @d1 1752 @ 1.1.1.5.4.2 log @Rebase to HEAD as of a few days ago. @ text @a0 1752 //===--- CGDecl.cpp - Emit LLVM Code for declarations ---------------------===// // // The LLVM Compiler Infrastructure // // This file is distributed under the University of Illinois Open Source // License. See LICENSE.TXT for details. // //===----------------------------------------------------------------------===// // // This contains code to emit Decl nodes as LLVM code. // //===----------------------------------------------------------------------===// #include "CodeGenFunction.h" #include "CGDebugInfo.h" #include "CGOpenCLRuntime.h" #include "CodeGenModule.h" #include "clang/AST/ASTContext.h" #include "clang/AST/CharUnits.h" #include "clang/AST/Decl.h" #include "clang/AST/DeclObjC.h" #include "clang/Basic/SourceManager.h" #include "clang/Basic/TargetInfo.h" #include "clang/CodeGen/CGFunctionInfo.h" #include "clang/Frontend/CodeGenOptions.h" #include "llvm/IR/DataLayout.h" #include "llvm/IR/GlobalVariable.h" #include "llvm/IR/Intrinsics.h" #include "llvm/IR/Type.h" using namespace clang; using namespace CodeGen; void CodeGenFunction::EmitDecl(const Decl &D) { switch (D.getKind()) { case Decl::TranslationUnit: case Decl::Namespace: case Decl::UnresolvedUsingTypename: case Decl::ClassTemplateSpecialization: case Decl::ClassTemplatePartialSpecialization: case Decl::VarTemplateSpecialization: case Decl::VarTemplatePartialSpecialization: case Decl::TemplateTypeParm: case Decl::UnresolvedUsingValue: case Decl::NonTypeTemplateParm: case Decl::CXXMethod: case Decl::CXXConstructor: case Decl::CXXDestructor: case Decl::CXXConversion: case Decl::Field: case Decl::MSProperty: case Decl::IndirectField: case Decl::ObjCIvar: case Decl::ObjCAtDefsField: case Decl::ParmVar: case Decl::ImplicitParam: case Decl::ClassTemplate: case Decl::VarTemplate: case Decl::FunctionTemplate: case Decl::TypeAliasTemplate: case Decl::TemplateTemplateParm: case Decl::ObjCMethod: case Decl::ObjCCategory: case Decl::ObjCProtocol: case Decl::ObjCInterface: case Decl::ObjCCategoryImpl: case Decl::ObjCImplementation: case Decl::ObjCProperty: case Decl::ObjCCompatibleAlias: case Decl::AccessSpec: case Decl::LinkageSpec: case Decl::ObjCPropertyImpl: case Decl::FileScopeAsm: case Decl::Friend: case Decl::FriendTemplate: case Decl::Block: case Decl::Captured: case Decl::ClassScopeFunctionSpecialization: case Decl::UsingShadow: llvm_unreachable("Declaration should not be in declstmts!"); case Decl::Function: // void X(); case Decl::Record: // struct/union/class X; case Decl::Enum: // enum X; case Decl::EnumConstant: // enum ? { X = ? } case Decl::CXXRecord: // struct/union/class X; [C++] case Decl::StaticAssert: // static_assert(X, ""); [C++0x] case Decl::Label: // __label__ x; case Decl::Import: case Decl::OMPThreadPrivate: case Decl::Empty: // None of these decls require codegen support. return; case Decl::NamespaceAlias: if (CGDebugInfo *DI = getDebugInfo()) DI->EmitNamespaceAlias(cast(D)); return; case Decl::Using: // using X; [C++] if (CGDebugInfo *DI = getDebugInfo()) DI->EmitUsingDecl(cast(D)); return; case Decl::UsingDirective: // using namespace X; [C++] if (CGDebugInfo *DI = getDebugInfo()) DI->EmitUsingDirective(cast(D)); return; case Decl::Var: { const VarDecl &VD = cast(D); assert(VD.isLocalVarDecl() && "Should not see file-scope variables inside a function!"); return EmitVarDecl(VD); } case Decl::Typedef: // typedef int X; case Decl::TypeAlias: { // using X = int; [C++0x] const TypedefNameDecl &TD = cast(D); QualType Ty = TD.getUnderlyingType(); if (Ty->isVariablyModifiedType()) EmitVariablyModifiedType(Ty); } } } /// EmitVarDecl - This method handles emission of any variable declaration /// inside a function, including static vars etc. void CodeGenFunction::EmitVarDecl(const VarDecl &D) { if (D.isStaticLocal()) { llvm::GlobalValue::LinkageTypes Linkage = CGM.getLLVMLinkageVarDefinition(&D, /*isConstant=*/false); // FIXME: We need to force the emission/use of a guard variable for // some variables even if we can constant-evaluate them because // we can't guarantee every translation unit will constant-evaluate them. return EmitStaticVarDecl(D, Linkage); } if (D.hasExternalStorage()) // Don't emit it now, allow it to be emitted lazily on its first use. return; if (D.getStorageClass() == SC_OpenCLWorkGroupLocal) return CGM.getOpenCLRuntime().EmitWorkGroupLocalVarDecl(*this, D); assert(D.hasLocalStorage()); return EmitAutoVarDecl(D); } static std::string GetStaticDeclName(CodeGenFunction &CGF, const VarDecl &D) { CodeGenModule &CGM = CGF.CGM; if (CGF.getLangOpts().CPlusPlus) return CGM.getMangledName(&D).str(); StringRef ContextName; if (!CGF.CurFuncDecl) { // Better be in a block declared in global scope. const NamedDecl *ND = cast(&D); const DeclContext *DC = ND->getDeclContext(); if (const BlockDecl *BD = dyn_cast(DC)) ContextName = CGM.getBlockMangledName(GlobalDecl(), BD); else llvm_unreachable("Unknown context for block static var decl"); } else if (const FunctionDecl *FD = dyn_cast(CGF.CurFuncDecl)) ContextName = CGM.getMangledName(FD); else if (isa(CGF.CurFuncDecl)) ContextName = CGF.CurFn->getName(); else llvm_unreachable("Unknown context for static var decl"); return ContextName.str() + "." + D.getNameAsString(); } llvm::Constant * CodeGenFunction::CreateStaticVarDecl(const VarDecl &D, llvm::GlobalValue::LinkageTypes Linkage) { QualType Ty = D.getType(); assert(Ty->isConstantSizeType() && "VLAs can't be static"); // Use the label if the variable is renamed with the asm-label extension. std::string Name; if (D.hasAttr()) Name = CGM.getMangledName(&D); else Name = GetStaticDeclName(*this, D); llvm::Type *LTy = CGM.getTypes().ConvertTypeForMem(Ty); unsigned AddrSpace = CGM.GetGlobalVarAddressSpace(&D, CGM.getContext().getTargetAddressSpace(Ty)); llvm::GlobalVariable *GV = new llvm::GlobalVariable(CGM.getModule(), LTy, Ty.isConstant(getContext()), Linkage, CGM.EmitNullConstant(D.getType()), Name, nullptr, llvm::GlobalVariable::NotThreadLocal, AddrSpace); GV->setAlignment(getContext().getDeclAlign(&D).getQuantity()); CGM.setGlobalVisibility(GV, &D); if (D.getTLSKind()) CGM.setTLSMode(GV, D); if (D.isExternallyVisible()) { if (D.hasAttr()) GV->setDLLStorageClass(llvm::GlobalVariable::DLLImportStorageClass); else if (D.hasAttr()) GV->setDLLStorageClass(llvm::GlobalVariable::DLLExportStorageClass); } // Make sure the result is of the correct type. unsigned ExpectedAddrSpace = CGM.getContext().getTargetAddressSpace(Ty); if (AddrSpace != ExpectedAddrSpace) { llvm::PointerType *PTy = llvm::PointerType::get(LTy, ExpectedAddrSpace); return llvm::ConstantExpr::getAddrSpaceCast(GV, PTy); } return GV; } /// hasNontrivialDestruction - Determine whether a type's destruction is /// non-trivial. If so, and the variable uses static initialization, we must /// register its destructor to run on exit. static bool hasNontrivialDestruction(QualType T) { CXXRecordDecl *RD = T->getBaseElementTypeUnsafe()->getAsCXXRecordDecl(); return RD && !RD->hasTrivialDestructor(); } /// AddInitializerToStaticVarDecl - Add the initializer for 'D' to the /// global variable that has already been created for it. If the initializer /// has a different type than GV does, this may free GV and return a different /// one. Otherwise it just returns GV. llvm::GlobalVariable * CodeGenFunction::AddInitializerToStaticVarDecl(const VarDecl &D, llvm::GlobalVariable *GV) { llvm::Constant *Init = CGM.EmitConstantInit(D, this); // If constant emission failed, then this should be a C++ static // initializer. if (!Init) { if (!getLangOpts().CPlusPlus) CGM.ErrorUnsupported(D.getInit(), "constant l-value expression"); else if (Builder.GetInsertBlock()) { // Since we have a static initializer, this global variable can't // be constant. GV->setConstant(false); EmitCXXGuardedInit(D, GV, /*PerformInit*/true); } return GV; } // The initializer may differ in type from the global. Rewrite // the global to match the initializer. (We have to do this // because some types, like unions, can't be completely represented // in the LLVM type system.) if (GV->getType()->getElementType() != Init->getType()) { llvm::GlobalVariable *OldGV = GV; GV = new llvm::GlobalVariable(CGM.getModule(), Init->getType(), OldGV->isConstant(), OldGV->getLinkage(), Init, "", /*InsertBefore*/ OldGV, OldGV->getThreadLocalMode(), CGM.getContext().getTargetAddressSpace(D.getType())); GV->setVisibility(OldGV->getVisibility()); // Steal the name of the old global GV->takeName(OldGV); // Replace all uses of the old global with the new global llvm::Constant *NewPtrForOldDecl = llvm::ConstantExpr::getBitCast(GV, OldGV->getType()); OldGV->replaceAllUsesWith(NewPtrForOldDecl); // Erase the old global, since it is no longer used. OldGV->eraseFromParent(); } GV->setConstant(CGM.isTypeConstant(D.getType(), true)); GV->setInitializer(Init); if (hasNontrivialDestruction(D.getType())) { // We have a constant initializer, but a nontrivial destructor. We still // need to perform a guarded "initialization" in order to register the // destructor. EmitCXXGuardedInit(D, GV, /*PerformInit*/false); } return GV; } void CodeGenFunction::EmitStaticVarDecl(const VarDecl &D, llvm::GlobalValue::LinkageTypes Linkage) { llvm::Value *&DMEntry = LocalDeclMap[&D]; assert(!DMEntry && "Decl already exists in localdeclmap!"); // Check to see if we already have a global variable for this // declaration. This can happen when double-emitting function // bodies, e.g. with complete and base constructors. llvm::Constant *addr = CGM.getStaticLocalDeclAddress(&D); if (!addr) addr = CreateStaticVarDecl(D, Linkage); // Store into LocalDeclMap before generating initializer to handle // circular references. DMEntry = addr; CGM.setStaticLocalDeclAddress(&D, addr); // We can't have a VLA here, but we can have a pointer to a VLA, // even though that doesn't really make any sense. // Make sure to evaluate VLA bounds now so that we have them for later. if (D.getType()->isVariablyModifiedType()) EmitVariablyModifiedType(D.getType()); // Save the type in case adding the initializer forces a type change. llvm::Type *expectedType = addr->getType(); llvm::GlobalVariable *var = cast(addr->stripPointerCasts()); // If this value has an initializer, emit it. if (D.getInit()) var = AddInitializerToStaticVarDecl(D, var); var->setAlignment(getContext().getDeclAlign(&D).getQuantity()); if (D.hasAttr()) CGM.AddGlobalAnnotations(&D, var); if (const SectionAttr *SA = D.getAttr()) var->setSection(SA->getName()); if (D.hasAttr()) CGM.addUsedGlobal(var); // We may have to cast the constant because of the initializer // mismatch above. // // FIXME: It is really dangerous to store this in the map; if anyone // RAUW's the GV uses of this constant will be invalid. llvm::Constant *castedAddr = llvm::ConstantExpr::getPointerBitCastOrAddrSpaceCast(var, expectedType); DMEntry = castedAddr; CGM.setStaticLocalDeclAddress(&D, castedAddr); CGM.getSanitizerMetadata()->reportGlobalToASan(var, D); // Emit global variable debug descriptor for static vars. CGDebugInfo *DI = getDebugInfo(); if (DI && CGM.getCodeGenOpts().getDebugInfo() >= CodeGenOptions::LimitedDebugInfo) { DI->setLocation(D.getLocation()); DI->EmitGlobalVariable(var, &D); } } namespace { struct DestroyObject : EHScopeStack::Cleanup { DestroyObject(llvm::Value *addr, QualType type, CodeGenFunction::Destroyer *destroyer, bool useEHCleanupForArray) : addr(addr), type(type), destroyer(destroyer), useEHCleanupForArray(useEHCleanupForArray) {} llvm::Value *addr; QualType type; CodeGenFunction::Destroyer *destroyer; bool useEHCleanupForArray; void Emit(CodeGenFunction &CGF, Flags flags) override { // Don't use an EH cleanup recursively from an EH cleanup. bool useEHCleanupForArray = flags.isForNormalCleanup() && this->useEHCleanupForArray; CGF.emitDestroy(addr, type, destroyer, useEHCleanupForArray); } }; struct DestroyNRVOVariable : EHScopeStack::Cleanup { DestroyNRVOVariable(llvm::Value *addr, const CXXDestructorDecl *Dtor, llvm::Value *NRVOFlag) : Dtor(Dtor), NRVOFlag(NRVOFlag), Loc(addr) {} const CXXDestructorDecl *Dtor; llvm::Value *NRVOFlag; llvm::Value *Loc; void Emit(CodeGenFunction &CGF, Flags flags) override { // Along the exceptions path we always execute the dtor. bool NRVO = flags.isForNormalCleanup() && NRVOFlag; llvm::BasicBlock *SkipDtorBB = nullptr; if (NRVO) { // If we exited via NRVO, we skip the destructor call. llvm::BasicBlock *RunDtorBB = CGF.createBasicBlock("nrvo.unused"); SkipDtorBB = CGF.createBasicBlock("nrvo.skipdtor"); llvm::Value *DidNRVO = CGF.Builder.CreateLoad(NRVOFlag, "nrvo.val"); CGF.Builder.CreateCondBr(DidNRVO, SkipDtorBB, RunDtorBB); CGF.EmitBlock(RunDtorBB); } CGF.EmitCXXDestructorCall(Dtor, Dtor_Complete, /*ForVirtualBase=*/false, /*Delegating=*/false, Loc); if (NRVO) CGF.EmitBlock(SkipDtorBB); } }; struct CallStackRestore : EHScopeStack::Cleanup { llvm::Value *Stack; CallStackRestore(llvm::Value *Stack) : Stack(Stack) {} void Emit(CodeGenFunction &CGF, Flags flags) override { llvm::Value *V = CGF.Builder.CreateLoad(Stack); llvm::Value *F = CGF.CGM.getIntrinsic(llvm::Intrinsic::stackrestore); CGF.Builder.CreateCall(F, V); } }; struct ExtendGCLifetime : EHScopeStack::Cleanup { const VarDecl &Var; ExtendGCLifetime(const VarDecl *var) : Var(*var) {} void Emit(CodeGenFunction &CGF, Flags flags) override { // Compute the address of the local variable, in case it's a // byref or something. DeclRefExpr DRE(const_cast(&Var), false, Var.getType(), VK_LValue, SourceLocation()); llvm::Value *value = CGF.EmitLoadOfScalar(CGF.EmitDeclRefLValue(&DRE), SourceLocation()); CGF.EmitExtendGCLifetime(value); } }; struct CallCleanupFunction : EHScopeStack::Cleanup { llvm::Constant *CleanupFn; const CGFunctionInfo &FnInfo; const VarDecl &Var; CallCleanupFunction(llvm::Constant *CleanupFn, const CGFunctionInfo *Info, const VarDecl *Var) : CleanupFn(CleanupFn), FnInfo(*Info), Var(*Var) {} void Emit(CodeGenFunction &CGF, Flags flags) override { DeclRefExpr DRE(const_cast(&Var), false, Var.getType(), VK_LValue, SourceLocation()); // Compute the address of the local variable, in case it's a byref // or something. llvm::Value *Addr = CGF.EmitDeclRefLValue(&DRE).getAddress(); // In some cases, the type of the function argument will be different from // the type of the pointer. An example of this is // void f(void* arg); // __attribute__((cleanup(f))) void *g; // // To fix this we insert a bitcast here. QualType ArgTy = FnInfo.arg_begin()->type; llvm::Value *Arg = CGF.Builder.CreateBitCast(Addr, CGF.ConvertType(ArgTy)); CallArgList Args; Args.add(RValue::get(Arg), CGF.getContext().getPointerType(Var.getType())); CGF.EmitCall(FnInfo, CleanupFn, ReturnValueSlot(), Args); } }; /// A cleanup to call @@llvm.lifetime.end. class CallLifetimeEnd : public EHScopeStack::Cleanup { llvm::Value *Addr; llvm::Value *Size; public: CallLifetimeEnd(llvm::Value *addr, llvm::Value *size) : Addr(addr), Size(size) {} void Emit(CodeGenFunction &CGF, Flags flags) override { llvm::Value *castAddr = CGF.Builder.CreateBitCast(Addr, CGF.Int8PtrTy); CGF.Builder.CreateCall2(CGF.CGM.getLLVMLifetimeEndFn(), Size, castAddr) ->setDoesNotThrow(); } }; } /// EmitAutoVarWithLifetime - Does the setup required for an automatic /// variable with lifetime. static void EmitAutoVarWithLifetime(CodeGenFunction &CGF, const VarDecl &var, llvm::Value *addr, Qualifiers::ObjCLifetime lifetime) { switch (lifetime) { case Qualifiers::OCL_None: llvm_unreachable("present but none"); case Qualifiers::OCL_ExplicitNone: // nothing to do break; case Qualifiers::OCL_Strong: { CodeGenFunction::Destroyer *destroyer = (var.hasAttr() ? CodeGenFunction::destroyARCStrongPrecise : CodeGenFunction::destroyARCStrongImprecise); CleanupKind cleanupKind = CGF.getARCCleanupKind(); CGF.pushDestroy(cleanupKind, addr, var.getType(), destroyer, cleanupKind & EHCleanup); break; } case Qualifiers::OCL_Autoreleasing: // nothing to do break; case Qualifiers::OCL_Weak: // __weak objects always get EH cleanups; otherwise, exceptions // could cause really nasty crashes instead of mere leaks. CGF.pushDestroy(NormalAndEHCleanup, addr, var.getType(), CodeGenFunction::destroyARCWeak, /*useEHCleanup*/ true); break; } } static bool isAccessedBy(const VarDecl &var, const Stmt *s) { if (const Expr *e = dyn_cast(s)) { // Skip the most common kinds of expressions that make // hierarchy-walking expensive. s = e = e->IgnoreParenCasts(); if (const DeclRefExpr *ref = dyn_cast(e)) return (ref->getDecl() == &var); if (const BlockExpr *be = dyn_cast(e)) { const BlockDecl *block = be->getBlockDecl(); for (const auto &I : block->captures()) { if (I.getVariable() == &var) return true; } } } for (Stmt::const_child_range children = s->children(); children; ++children) // children might be null; as in missing decl or conditional of an if-stmt. if ((*children) && isAccessedBy(var, *children)) return true; return false; } static bool isAccessedBy(const ValueDecl *decl, const Expr *e) { if (!decl) return false; if (!isa(decl)) return false; const VarDecl *var = cast(decl); return isAccessedBy(*var, e); } static void drillIntoBlockVariable(CodeGenFunction &CGF, LValue &lvalue, const VarDecl *var) { lvalue.setAddress(CGF.BuildBlockByrefAddress(lvalue.getAddress(), var)); } void CodeGenFunction::EmitScalarInit(const Expr *init, const ValueDecl *D, LValue lvalue, bool capturedByInit) { Qualifiers::ObjCLifetime lifetime = lvalue.getObjCLifetime(); if (!lifetime) { llvm::Value *value = EmitScalarExpr(init); if (capturedByInit) drillIntoBlockVariable(*this, lvalue, cast(D)); EmitStoreThroughLValue(RValue::get(value), lvalue, true); return; } if (const CXXDefaultInitExpr *DIE = dyn_cast(init)) init = DIE->getExpr(); // If we're emitting a value with lifetime, we have to do the // initialization *before* we leave the cleanup scopes. if (const ExprWithCleanups *ewc = dyn_cast(init)) { enterFullExpression(ewc); init = ewc->getSubExpr(); } CodeGenFunction::RunCleanupsScope Scope(*this); // We have to maintain the illusion that the variable is // zero-initialized. If the variable might be accessed in its // initializer, zero-initialize before running the initializer, then // actually perform the initialization with an assign. bool accessedByInit = false; if (lifetime != Qualifiers::OCL_ExplicitNone) accessedByInit = (capturedByInit || isAccessedBy(D, init)); if (accessedByInit) { LValue tempLV = lvalue; // Drill down to the __block object if necessary. if (capturedByInit) { // We can use a simple GEP for this because it can't have been // moved yet. tempLV.setAddress(Builder.CreateStructGEP(tempLV.getAddress(), getByRefValueLLVMField(cast(D)))); } llvm::PointerType *ty = cast(tempLV.getAddress()->getType()); ty = cast(ty->getElementType()); llvm::Value *zero = llvm::ConstantPointerNull::get(ty); // If __weak, we want to use a barrier under certain conditions. if (lifetime == Qualifiers::OCL_Weak) EmitARCInitWeak(tempLV.getAddress(), zero); // Otherwise just do a simple store. else EmitStoreOfScalar(zero, tempLV, /* isInitialization */ true); } // Emit the initializer. llvm::Value *value = nullptr; switch (lifetime) { case Qualifiers::OCL_None: llvm_unreachable("present but none"); case Qualifiers::OCL_ExplicitNone: // nothing to do value = EmitScalarExpr(init); break; case Qualifiers::OCL_Strong: { value = EmitARCRetainScalarExpr(init); break; } case Qualifiers::OCL_Weak: { // No way to optimize a producing initializer into this. It's not // worth optimizing for, because the value will immediately // disappear in the common case. value = EmitScalarExpr(init); if (capturedByInit) drillIntoBlockVariable(*this, lvalue, cast(D)); if (accessedByInit) EmitARCStoreWeak(lvalue.getAddress(), value, /*ignored*/ true); else EmitARCInitWeak(lvalue.getAddress(), value); return; } case Qualifiers::OCL_Autoreleasing: value = EmitARCRetainAutoreleaseScalarExpr(init); break; } if (capturedByInit) drillIntoBlockVariable(*this, lvalue, cast(D)); // If the variable might have been accessed by its initializer, we // might have to initialize with a barrier. We have to do this for // both __weak and __strong, but __weak got filtered out above. if (accessedByInit && lifetime == Qualifiers::OCL_Strong) { llvm::Value *oldValue = EmitLoadOfScalar(lvalue, init->getExprLoc()); EmitStoreOfScalar(value, lvalue, /* isInitialization */ true); EmitARCRelease(oldValue, ARCImpreciseLifetime); return; } EmitStoreOfScalar(value, lvalue, /* isInitialization */ true); } /// EmitScalarInit - Initialize the given lvalue with the given object. void CodeGenFunction::EmitScalarInit(llvm::Value *init, LValue lvalue) { Qualifiers::ObjCLifetime lifetime = lvalue.getObjCLifetime(); if (!lifetime) return EmitStoreThroughLValue(RValue::get(init), lvalue, true); switch (lifetime) { case Qualifiers::OCL_None: llvm_unreachable("present but none"); case Qualifiers::OCL_ExplicitNone: // nothing to do break; case Qualifiers::OCL_Strong: init = EmitARCRetain(lvalue.getType(), init); break; case Qualifiers::OCL_Weak: // Initialize and then skip the primitive store. EmitARCInitWeak(lvalue.getAddress(), init); return; case Qualifiers::OCL_Autoreleasing: init = EmitARCRetainAutorelease(lvalue.getType(), init); break; } EmitStoreOfScalar(init, lvalue, /* isInitialization */ true); } /// canEmitInitWithFewStoresAfterMemset - Decide whether we can emit the /// non-zero parts of the specified initializer with equal or fewer than /// NumStores scalar stores. static bool canEmitInitWithFewStoresAfterMemset(llvm::Constant *Init, unsigned &NumStores) { // Zero and Undef never requires any extra stores. if (isa(Init) || isa(Init) || isa(Init)) return true; if (isa(Init) || isa(Init) || isa(Init) || isa(Init) || isa(Init)) return Init->isNullValue() || NumStores--; // See if we can emit each element. if (isa(Init) || isa(Init)) { for (unsigned i = 0, e = Init->getNumOperands(); i != e; ++i) { llvm::Constant *Elt = cast(Init->getOperand(i)); if (!canEmitInitWithFewStoresAfterMemset(Elt, NumStores)) return false; } return true; } if (llvm::ConstantDataSequential *CDS = dyn_cast(Init)) { for (unsigned i = 0, e = CDS->getNumElements(); i != e; ++i) { llvm::Constant *Elt = CDS->getElementAsConstant(i); if (!canEmitInitWithFewStoresAfterMemset(Elt, NumStores)) return false; } return true; } // Anything else is hard and scary. return false; } /// emitStoresForInitAfterMemset - For inits that /// canEmitInitWithFewStoresAfterMemset returned true for, emit the scalar /// stores that would be required. static void emitStoresForInitAfterMemset(llvm::Constant *Init, llvm::Value *Loc, bool isVolatile, CGBuilderTy &Builder) { assert(!Init->isNullValue() && !isa(Init) && "called emitStoresForInitAfterMemset for zero or undef value."); if (isa(Init) || isa(Init) || isa(Init) || isa(Init) || isa(Init)) { Builder.CreateStore(Init, Loc, isVolatile); return; } if (llvm::ConstantDataSequential *CDS = dyn_cast(Init)) { for (unsigned i = 0, e = CDS->getNumElements(); i != e; ++i) { llvm::Constant *Elt = CDS->getElementAsConstant(i); // If necessary, get a pointer to the element and emit it. if (!Elt->isNullValue() && !isa(Elt)) emitStoresForInitAfterMemset(Elt, Builder.CreateConstGEP2_32(Loc, 0, i), isVolatile, Builder); } return; } assert((isa(Init) || isa(Init)) && "Unknown value type!"); for (unsigned i = 0, e = Init->getNumOperands(); i != e; ++i) { llvm::Constant *Elt = cast(Init->getOperand(i)); // If necessary, get a pointer to the element and emit it. if (!Elt->isNullValue() && !isa(Elt)) emitStoresForInitAfterMemset(Elt, Builder.CreateConstGEP2_32(Loc, 0, i), isVolatile, Builder); } } /// shouldUseMemSetPlusStoresToInitialize - Decide whether we should use memset /// plus some stores to initialize a local variable instead of using a memcpy /// from a constant global. It is beneficial to use memset if the global is all /// zeros, or mostly zeros and large. static bool shouldUseMemSetPlusStoresToInitialize(llvm::Constant *Init, uint64_t GlobalSize) { // If a global is all zeros, always use a memset. if (isa(Init)) return true; // If a non-zero global is <= 32 bytes, always use a memcpy. If it is large, // do it if it will require 6 or fewer scalar stores. // TODO: Should budget depends on the size? Avoiding a large global warrants // plopping in more stores. unsigned StoreBudget = 6; uint64_t SizeLimit = 32; return GlobalSize > SizeLimit && canEmitInitWithFewStoresAfterMemset(Init, StoreBudget); } /// Should we use the LLVM lifetime intrinsics for the given local variable? static bool shouldUseLifetimeMarkers(CodeGenFunction &CGF, const VarDecl &D, unsigned Size) { // For now, only in optimized builds. if (CGF.CGM.getCodeGenOpts().OptimizationLevel == 0) return false; // Limit the size of marked objects to 32 bytes. We don't want to increase // compile time by marking tiny objects. unsigned SizeThreshold = 32; return Size > SizeThreshold; } /// EmitAutoVarDecl - Emit code and set up an entry in LocalDeclMap for a /// variable declaration with auto, register, or no storage class specifier. /// These turn into simple stack objects, or GlobalValues depending on target. void CodeGenFunction::EmitAutoVarDecl(const VarDecl &D) { AutoVarEmission emission = EmitAutoVarAlloca(D); EmitAutoVarInit(emission); EmitAutoVarCleanups(emission); } /// EmitAutoVarAlloca - Emit the alloca and debug information for a /// local variable. Does not emit initialization or destruction. CodeGenFunction::AutoVarEmission CodeGenFunction::EmitAutoVarAlloca(const VarDecl &D) { QualType Ty = D.getType(); AutoVarEmission emission(D); bool isByRef = D.hasAttr(); emission.IsByRef = isByRef; CharUnits alignment = getContext().getDeclAlign(&D); emission.Alignment = alignment; // If the type is variably-modified, emit all the VLA sizes for it. if (Ty->isVariablyModifiedType()) EmitVariablyModifiedType(Ty); llvm::Value *DeclPtr; if (Ty->isConstantSizeType()) { bool NRVO = getLangOpts().ElideConstructors && D.isNRVOVariable(); // If this value is an array or struct with a statically determinable // constant initializer, there are optimizations we can do. // // TODO: We should constant-evaluate the initializer of any variable, // as long as it is initialized by a constant expression. Currently, // isConstantInitializer produces wrong answers for structs with // reference or bitfield members, and a few other cases, and checking // for POD-ness protects us from some of these. if (D.getInit() && (Ty->isArrayType() || Ty->isRecordType()) && (D.isConstexpr() || ((Ty.isPODType(getContext()) || getContext().getBaseElementType(Ty)->isObjCObjectPointerType()) && D.getInit()->isConstantInitializer(getContext(), false)))) { // If the variable's a const type, and it's neither an NRVO // candidate nor a __block variable and has no mutable members, // emit it as a global instead. if (CGM.getCodeGenOpts().MergeAllConstants && !NRVO && !isByRef && CGM.isTypeConstant(Ty, true)) { EmitStaticVarDecl(D, llvm::GlobalValue::InternalLinkage); emission.Address = nullptr; // signal this condition to later callbacks assert(emission.wasEmittedAsGlobal()); return emission; } // Otherwise, tell the initialization code that we're in this case. emission.IsConstantAggregate = true; } // A normal fixed sized variable becomes an alloca in the entry block, // unless it's an NRVO variable. llvm::Type *LTy = ConvertTypeForMem(Ty); if (NRVO) { // The named return value optimization: allocate this variable in the // return slot, so that we can elide the copy when returning this // variable (C++0x [class.copy]p34). DeclPtr = ReturnValue; if (const RecordType *RecordTy = Ty->getAs()) { if (!cast(RecordTy->getDecl())->hasTrivialDestructor()) { // Create a flag that is used to indicate when the NRVO was applied // to this variable. Set it to zero to indicate that NRVO was not // applied. llvm::Value *Zero = Builder.getFalse(); llvm::Value *NRVOFlag = CreateTempAlloca(Zero->getType(), "nrvo"); EnsureInsertPoint(); Builder.CreateStore(Zero, NRVOFlag); // Record the NRVO flag for this variable. NRVOFlags[&D] = NRVOFlag; emission.NRVOFlag = NRVOFlag; } } } else { if (isByRef) LTy = BuildByRefType(&D); llvm::AllocaInst *Alloc = CreateTempAlloca(LTy); Alloc->setName(D.getName()); CharUnits allocaAlignment = alignment; if (isByRef) allocaAlignment = std::max(allocaAlignment, getContext().toCharUnitsFromBits(getTarget().getPointerAlign(0))); Alloc->setAlignment(allocaAlignment.getQuantity()); DeclPtr = Alloc; // Emit a lifetime intrinsic if meaningful. There's no point // in doing this if we don't have a valid insertion point (?). uint64_t size = CGM.getDataLayout().getTypeAllocSize(LTy); if (HaveInsertPoint() && shouldUseLifetimeMarkers(*this, D, size)) { llvm::Value *sizeV = llvm::ConstantInt::get(Int64Ty, size); emission.SizeForLifetimeMarkers = sizeV; llvm::Value *castAddr = Builder.CreateBitCast(Alloc, Int8PtrTy); Builder.CreateCall2(CGM.getLLVMLifetimeStartFn(), sizeV, castAddr) ->setDoesNotThrow(); } else { assert(!emission.useLifetimeMarkers()); } } } else { EnsureInsertPoint(); if (!DidCallStackSave) { // Save the stack. llvm::Value *Stack = CreateTempAlloca(Int8PtrTy, "saved_stack"); llvm::Value *F = CGM.getIntrinsic(llvm::Intrinsic::stacksave); llvm::Value *V = Builder.CreateCall(F); Builder.CreateStore(V, Stack); DidCallStackSave = true; // Push a cleanup block and restore the stack there. // FIXME: in general circumstances, this should be an EH cleanup. pushStackRestore(NormalCleanup, Stack); } llvm::Value *elementCount; QualType elementType; std::tie(elementCount, elementType) = getVLASize(Ty); llvm::Type *llvmTy = ConvertTypeForMem(elementType); // Allocate memory for the array. llvm::AllocaInst *vla = Builder.CreateAlloca(llvmTy, elementCount, "vla"); vla->setAlignment(alignment.getQuantity()); DeclPtr = vla; } llvm::Value *&DMEntry = LocalDeclMap[&D]; assert(!DMEntry && "Decl already exists in localdeclmap!"); DMEntry = DeclPtr; emission.Address = DeclPtr; // Emit debug info for local var declaration. if (HaveInsertPoint()) if (CGDebugInfo *DI = getDebugInfo()) { if (CGM.getCodeGenOpts().getDebugInfo() >= CodeGenOptions::LimitedDebugInfo) { DI->setLocation(D.getLocation()); DI->EmitDeclareOfAutoVariable(&D, DeclPtr, Builder); } } if (D.hasAttr()) EmitVarAnnotations(&D, emission.Address); return emission; } /// Determines whether the given __block variable is potentially /// captured by the given expression. static bool isCapturedBy(const VarDecl &var, const Expr *e) { // Skip the most common kinds of expressions that make // hierarchy-walking expensive. e = e->IgnoreParenCasts(); if (const BlockExpr *be = dyn_cast(e)) { const BlockDecl *block = be->getBlockDecl(); for (const auto &I : block->captures()) { if (I.getVariable() == &var) return true; } // No need to walk into the subexpressions. return false; } if (const StmtExpr *SE = dyn_cast(e)) { const CompoundStmt *CS = SE->getSubStmt(); for (const auto *BI : CS->body()) if (const auto *E = dyn_cast(BI)) { if (isCapturedBy(var, E)) return true; } else if (const auto *DS = dyn_cast(BI)) { // special case declarations for (const auto *I : DS->decls()) { if (const auto *VD = dyn_cast((I))) { const Expr *Init = VD->getInit(); if (Init && isCapturedBy(var, Init)) return true; } } } else // FIXME. Make safe assumption assuming arbitrary statements cause capturing. // Later, provide code to poke into statements for capture analysis. return true; return false; } for (Stmt::const_child_range children = e->children(); children; ++children) if (isCapturedBy(var, cast(*children))) return true; return false; } /// \brief Determine whether the given initializer is trivial in the sense /// that it requires no code to be generated. static bool isTrivialInitializer(const Expr *Init) { if (!Init) return true; if (const CXXConstructExpr *Construct = dyn_cast(Init)) if (CXXConstructorDecl *Constructor = Construct->getConstructor()) if (Constructor->isTrivial() && Constructor->isDefaultConstructor() && !Construct->requiresZeroInitialization()) return true; return false; } void CodeGenFunction::EmitAutoVarInit(const AutoVarEmission &emission) { assert(emission.Variable && "emission was not valid!"); // If this was emitted as a global constant, we're done. if (emission.wasEmittedAsGlobal()) return; const VarDecl &D = *emission.Variable; QualType type = D.getType(); // If this local has an initializer, emit it now. const Expr *Init = D.getInit(); // If we are at an unreachable point, we don't need to emit the initializer // unless it contains a label. if (!HaveInsertPoint()) { if (!Init || !ContainsLabel(Init)) return; EnsureInsertPoint(); } // Initialize the structure of a __block variable. if (emission.IsByRef) emitByrefStructureInit(emission); if (isTrivialInitializer(Init)) return; CharUnits alignment = emission.Alignment; // Check whether this is a byref variable that's potentially // captured and moved by its own initializer. If so, we'll need to // emit the initializer first, then copy into the variable. bool capturedByInit = emission.IsByRef && isCapturedBy(D, Init); llvm::Value *Loc = capturedByInit ? emission.Address : emission.getObjectAddress(*this); llvm::Constant *constant = nullptr; if (emission.IsConstantAggregate || D.isConstexpr()) { assert(!capturedByInit && "constant init contains a capturing block?"); constant = CGM.EmitConstantInit(D, this); } if (!constant) { LValue lv = MakeAddrLValue(Loc, type, alignment); lv.setNonGC(true); return EmitExprAsInit(Init, &D, lv, capturedByInit); } if (!emission.IsConstantAggregate) { // For simple scalar/complex initialization, store the value directly. LValue lv = MakeAddrLValue(Loc, type, alignment); lv.setNonGC(true); return EmitStoreThroughLValue(RValue::get(constant), lv, true); } // If this is a simple aggregate initialization, we can optimize it // in various ways. bool isVolatile = type.isVolatileQualified(); llvm::Value *SizeVal = llvm::ConstantInt::get(IntPtrTy, getContext().getTypeSizeInChars(type).getQuantity()); llvm::Type *BP = Int8PtrTy; if (Loc->getType() != BP) Loc = Builder.CreateBitCast(Loc, BP); // If the initializer is all or mostly zeros, codegen with memset then do // a few stores afterward. if (shouldUseMemSetPlusStoresToInitialize(constant, CGM.getDataLayout().getTypeAllocSize(constant->getType()))) { Builder.CreateMemSet(Loc, llvm::ConstantInt::get(Int8Ty, 0), SizeVal, alignment.getQuantity(), isVolatile); // Zero and undef don't require a stores. if (!constant->isNullValue() && !isa(constant)) { Loc = Builder.CreateBitCast(Loc, constant->getType()->getPointerTo()); emitStoresForInitAfterMemset(constant, Loc, isVolatile, Builder); } } else { // Otherwise, create a temporary global with the initializer then // memcpy from the global to the alloca. std::string Name = GetStaticDeclName(*this, D); llvm::GlobalVariable *GV = new llvm::GlobalVariable(CGM.getModule(), constant->getType(), true, llvm::GlobalValue::PrivateLinkage, constant, Name); GV->setAlignment(alignment.getQuantity()); GV->setUnnamedAddr(true); llvm::Value *SrcPtr = GV; if (SrcPtr->getType() != BP) SrcPtr = Builder.CreateBitCast(SrcPtr, BP); Builder.CreateMemCpy(Loc, SrcPtr, SizeVal, alignment.getQuantity(), isVolatile); } } /// Emit an expression as an initializer for a variable at the given /// location. The expression is not necessarily the normal /// initializer for the variable, and the address is not necessarily /// its normal location. /// /// \param init the initializing expression /// \param var the variable to act as if we're initializing /// \param loc the address to initialize; its type is a pointer /// to the LLVM mapping of the variable's type /// \param alignment the alignment of the address /// \param capturedByInit true if the variable is a __block variable /// whose address is potentially changed by the initializer void CodeGenFunction::EmitExprAsInit(const Expr *init, const ValueDecl *D, LValue lvalue, bool capturedByInit) { QualType type = D->getType(); if (type->isReferenceType()) { RValue rvalue = EmitReferenceBindingToExpr(init); if (capturedByInit) drillIntoBlockVariable(*this, lvalue, cast(D)); EmitStoreThroughLValue(rvalue, lvalue, true); return; } switch (getEvaluationKind(type)) { case TEK_Scalar: EmitScalarInit(init, D, lvalue, capturedByInit); return; case TEK_Complex: { ComplexPairTy complex = EmitComplexExpr(init); if (capturedByInit) drillIntoBlockVariable(*this, lvalue, cast(D)); EmitStoreOfComplex(complex, lvalue, /*init*/ true); return; } case TEK_Aggregate: if (type->isAtomicType()) { EmitAtomicInit(const_cast(init), lvalue); } else { // TODO: how can we delay here if D is captured by its initializer? EmitAggExpr(init, AggValueSlot::forLValue(lvalue, AggValueSlot::IsDestructed, AggValueSlot::DoesNotNeedGCBarriers, AggValueSlot::IsNotAliased)); } return; } llvm_unreachable("bad evaluation kind"); } /// Enter a destroy cleanup for the given local variable. void CodeGenFunction::emitAutoVarTypeCleanup( const CodeGenFunction::AutoVarEmission &emission, QualType::DestructionKind dtorKind) { assert(dtorKind != QualType::DK_none); // Note that for __block variables, we want to destroy the // original stack object, not the possibly forwarded object. llvm::Value *addr = emission.getObjectAddress(*this); const VarDecl *var = emission.Variable; QualType type = var->getType(); CleanupKind cleanupKind = NormalAndEHCleanup; CodeGenFunction::Destroyer *destroyer = nullptr; switch (dtorKind) { case QualType::DK_none: llvm_unreachable("no cleanup for trivially-destructible variable"); case QualType::DK_cxx_destructor: // If there's an NRVO flag on the emission, we need a different // cleanup. if (emission.NRVOFlag) { assert(!type->isArrayType()); CXXDestructorDecl *dtor = type->getAsCXXRecordDecl()->getDestructor(); EHStack.pushCleanup(cleanupKind, addr, dtor, emission.NRVOFlag); return; } break; case QualType::DK_objc_strong_lifetime: // Suppress cleanups for pseudo-strong variables. if (var->isARCPseudoStrong()) return; // Otherwise, consider whether to use an EH cleanup or not. cleanupKind = getARCCleanupKind(); // Use the imprecise destroyer by default. if (!var->hasAttr()) destroyer = CodeGenFunction::destroyARCStrongImprecise; break; case QualType::DK_objc_weak_lifetime: break; } // If we haven't chosen a more specific destroyer, use the default. if (!destroyer) destroyer = getDestroyer(dtorKind); // Use an EH cleanup in array destructors iff the destructor itself // is being pushed as an EH cleanup. bool useEHCleanup = (cleanupKind & EHCleanup); EHStack.pushCleanup(cleanupKind, addr, type, destroyer, useEHCleanup); } void CodeGenFunction::EmitAutoVarCleanups(const AutoVarEmission &emission) { assert(emission.Variable && "emission was not valid!"); // If this was emitted as a global constant, we're done. if (emission.wasEmittedAsGlobal()) return; // If we don't have an insertion point, we're done. Sema prevents // us from jumping into any of these scopes anyway. if (!HaveInsertPoint()) return; const VarDecl &D = *emission.Variable; // Make sure we call @@llvm.lifetime.end. This needs to happen // *last*, so the cleanup needs to be pushed *first*. if (emission.useLifetimeMarkers()) { EHStack.pushCleanup(NormalCleanup, emission.getAllocatedAddress(), emission.getSizeForLifetimeMarkers()); } // Check the type for a cleanup. if (QualType::DestructionKind dtorKind = D.getType().isDestructedType()) emitAutoVarTypeCleanup(emission, dtorKind); // In GC mode, honor objc_precise_lifetime. if (getLangOpts().getGC() != LangOptions::NonGC && D.hasAttr()) { EHStack.pushCleanup(NormalCleanup, &D); } // Handle the cleanup attribute. if (const CleanupAttr *CA = D.getAttr()) { const FunctionDecl *FD = CA->getFunctionDecl(); llvm::Constant *F = CGM.GetAddrOfFunction(FD); assert(F && "Could not find function!"); const CGFunctionInfo &Info = CGM.getTypes().arrangeFunctionDeclaration(FD); EHStack.pushCleanup(NormalAndEHCleanup, F, &Info, &D); } // If this is a block variable, call _Block_object_destroy // (on the unforwarded address). if (emission.IsByRef) enterByrefCleanup(emission); } CodeGenFunction::Destroyer * CodeGenFunction::getDestroyer(QualType::DestructionKind kind) { switch (kind) { case QualType::DK_none: llvm_unreachable("no destroyer for trivial dtor"); case QualType::DK_cxx_destructor: return destroyCXXObject; case QualType::DK_objc_strong_lifetime: return destroyARCStrongPrecise; case QualType::DK_objc_weak_lifetime: return destroyARCWeak; } llvm_unreachable("Unknown DestructionKind"); } /// pushEHDestroy - Push the standard destructor for the given type as /// an EH-only cleanup. void CodeGenFunction::pushEHDestroy(QualType::DestructionKind dtorKind, llvm::Value *addr, QualType type) { assert(dtorKind && "cannot push destructor for trivial type"); assert(needsEHCleanup(dtorKind)); pushDestroy(EHCleanup, addr, type, getDestroyer(dtorKind), true); } /// pushDestroy - Push the standard destructor for the given type as /// at least a normal cleanup. void CodeGenFunction::pushDestroy(QualType::DestructionKind dtorKind, llvm::Value *addr, QualType type) { assert(dtorKind && "cannot push destructor for trivial type"); CleanupKind cleanupKind = getCleanupKind(dtorKind); pushDestroy(cleanupKind, addr, type, getDestroyer(dtorKind), cleanupKind & EHCleanup); } void CodeGenFunction::pushDestroy(CleanupKind cleanupKind, llvm::Value *addr, QualType type, Destroyer *destroyer, bool useEHCleanupForArray) { pushFullExprCleanup(cleanupKind, addr, type, destroyer, useEHCleanupForArray); } void CodeGenFunction::pushStackRestore(CleanupKind Kind, llvm::Value *SPMem) { EHStack.pushCleanup(Kind, SPMem); } void CodeGenFunction::pushLifetimeExtendedDestroy( CleanupKind cleanupKind, llvm::Value *addr, QualType type, Destroyer *destroyer, bool useEHCleanupForArray) { assert(!isInConditionalBranch() && "performing lifetime extension from within conditional"); // Push an EH-only cleanup for the object now. // FIXME: When popping normal cleanups, we need to keep this EH cleanup // around in case a temporary's destructor throws an exception. if (cleanupKind & EHCleanup) EHStack.pushCleanup( static_cast(cleanupKind & ~NormalCleanup), addr, type, destroyer, useEHCleanupForArray); // Remember that we need to push a full cleanup for the object at the // end of the full-expression. pushCleanupAfterFullExpr( cleanupKind, addr, type, destroyer, useEHCleanupForArray); } /// emitDestroy - Immediately perform the destruction of the given /// object. /// /// \param addr - the address of the object; a type* /// \param type - the type of the object; if an array type, all /// objects are destroyed in reverse order /// \param destroyer - the function to call to destroy individual /// elements /// \param useEHCleanupForArray - whether an EH cleanup should be /// used when destroying array elements, in case one of the /// destructions throws an exception void CodeGenFunction::emitDestroy(llvm::Value *addr, QualType type, Destroyer *destroyer, bool useEHCleanupForArray) { const ArrayType *arrayType = getContext().getAsArrayType(type); if (!arrayType) return destroyer(*this, addr, type); llvm::Value *begin = addr; llvm::Value *length = emitArrayLength(arrayType, type, begin); // Normally we have to check whether the array is zero-length. bool checkZeroLength = true; // But if the array length is constant, we can suppress that. if (llvm::ConstantInt *constLength = dyn_cast(length)) { // ...and if it's constant zero, we can just skip the entire thing. if (constLength->isZero()) return; checkZeroLength = false; } llvm::Value *end = Builder.CreateInBoundsGEP(begin, length); emitArrayDestroy(begin, end, type, destroyer, checkZeroLength, useEHCleanupForArray); } /// emitArrayDestroy - Destroys all the elements of the given array, /// beginning from last to first. The array cannot be zero-length. /// /// \param begin - a type* denoting the first element of the array /// \param end - a type* denoting one past the end of the array /// \param type - the element type of the array /// \param destroyer - the function to call to destroy elements /// \param useEHCleanup - whether to push an EH cleanup to destroy /// the remaining elements in case the destruction of a single /// element throws void CodeGenFunction::emitArrayDestroy(llvm::Value *begin, llvm::Value *end, QualType type, Destroyer *destroyer, bool checkZeroLength, bool useEHCleanup) { assert(!type->isArrayType()); // The basic structure here is a do-while loop, because we don't // need to check for the zero-element case. llvm::BasicBlock *bodyBB = createBasicBlock("arraydestroy.body"); llvm::BasicBlock *doneBB = createBasicBlock("arraydestroy.done"); if (checkZeroLength) { llvm::Value *isEmpty = Builder.CreateICmpEQ(begin, end, "arraydestroy.isempty"); Builder.CreateCondBr(isEmpty, doneBB, bodyBB); } // Enter the loop body, making that address the current address. llvm::BasicBlock *entryBB = Builder.GetInsertBlock(); EmitBlock(bodyBB); llvm::PHINode *elementPast = Builder.CreatePHI(begin->getType(), 2, "arraydestroy.elementPast"); elementPast->addIncoming(end, entryBB); // Shift the address back by one element. llvm::Value *negativeOne = llvm::ConstantInt::get(SizeTy, -1, true); llvm::Value *element = Builder.CreateInBoundsGEP(elementPast, negativeOne, "arraydestroy.element"); if (useEHCleanup) pushRegularPartialArrayCleanup(begin, element, type, destroyer); // Perform the actual destruction there. destroyer(*this, element, type); if (useEHCleanup) PopCleanupBlock(); // Check whether we've reached the end. llvm::Value *done = Builder.CreateICmpEQ(element, begin, "arraydestroy.done"); Builder.CreateCondBr(done, doneBB, bodyBB); elementPast->addIncoming(element, Builder.GetInsertBlock()); // Done. EmitBlock(doneBB); } /// Perform partial array destruction as if in an EH cleanup. Unlike /// emitArrayDestroy, the element type here may still be an array type. static void emitPartialArrayDestroy(CodeGenFunction &CGF, llvm::Value *begin, llvm::Value *end, QualType type, CodeGenFunction::Destroyer *destroyer) { // If the element type is itself an array, drill down. unsigned arrayDepth = 0; while (const ArrayType *arrayType = CGF.getContext().getAsArrayType(type)) { // VLAs don't require a GEP index to walk into. if (!isa(arrayType)) arrayDepth++; type = arrayType->getElementType(); } if (arrayDepth) { llvm::Value *zero = llvm::ConstantInt::get(CGF.SizeTy, arrayDepth+1); SmallVector gepIndices(arrayDepth, zero); begin = CGF.Builder.CreateInBoundsGEP(begin, gepIndices, "pad.arraybegin"); end = CGF.Builder.CreateInBoundsGEP(end, gepIndices, "pad.arrayend"); } // Destroy the array. We don't ever need an EH cleanup because we // assume that we're in an EH cleanup ourselves, so a throwing // destructor causes an immediate terminate. CGF.emitArrayDestroy(begin, end, type, destroyer, /*checkZeroLength*/ true, /*useEHCleanup*/ false); } namespace { /// RegularPartialArrayDestroy - a cleanup which performs a partial /// array destroy where the end pointer is regularly determined and /// does not need to be loaded from a local. class RegularPartialArrayDestroy : public EHScopeStack::Cleanup { llvm::Value *ArrayBegin; llvm::Value *ArrayEnd; QualType ElementType; CodeGenFunction::Destroyer *Destroyer; public: RegularPartialArrayDestroy(llvm::Value *arrayBegin, llvm::Value *arrayEnd, QualType elementType, CodeGenFunction::Destroyer *destroyer) : ArrayBegin(arrayBegin), ArrayEnd(arrayEnd), ElementType(elementType), Destroyer(destroyer) {} void Emit(CodeGenFunction &CGF, Flags flags) override { emitPartialArrayDestroy(CGF, ArrayBegin, ArrayEnd, ElementType, Destroyer); } }; /// IrregularPartialArrayDestroy - a cleanup which performs a /// partial array destroy where the end pointer is irregularly /// determined and must be loaded from a local. class IrregularPartialArrayDestroy : public EHScopeStack::Cleanup { llvm::Value *ArrayBegin; llvm::Value *ArrayEndPointer; QualType ElementType; CodeGenFunction::Destroyer *Destroyer; public: IrregularPartialArrayDestroy(llvm::Value *arrayBegin, llvm::Value *arrayEndPointer, QualType elementType, CodeGenFunction::Destroyer *destroyer) : ArrayBegin(arrayBegin), ArrayEndPointer(arrayEndPointer), ElementType(elementType), Destroyer(destroyer) {} void Emit(CodeGenFunction &CGF, Flags flags) override { llvm::Value *arrayEnd = CGF.Builder.CreateLoad(ArrayEndPointer); emitPartialArrayDestroy(CGF, ArrayBegin, arrayEnd, ElementType, Destroyer); } }; } /// pushIrregularPartialArrayCleanup - Push an EH cleanup to destroy /// already-constructed elements of the given array. The cleanup /// may be popped with DeactivateCleanupBlock or PopCleanupBlock. /// /// \param elementType - the immediate element type of the array; /// possibly still an array type void CodeGenFunction::pushIrregularPartialArrayCleanup(llvm::Value *arrayBegin, llvm::Value *arrayEndPointer, QualType elementType, Destroyer *destroyer) { pushFullExprCleanup(EHCleanup, arrayBegin, arrayEndPointer, elementType, destroyer); } /// pushRegularPartialArrayCleanup - Push an EH cleanup to destroy /// already-constructed elements of the given array. The cleanup /// may be popped with DeactivateCleanupBlock or PopCleanupBlock. /// /// \param elementType - the immediate element type of the array; /// possibly still an array type void CodeGenFunction::pushRegularPartialArrayCleanup(llvm::Value *arrayBegin, llvm::Value *arrayEnd, QualType elementType, Destroyer *destroyer) { pushFullExprCleanup(EHCleanup, arrayBegin, arrayEnd, elementType, destroyer); } /// Lazily declare the @@llvm.lifetime.start intrinsic. llvm::Constant *CodeGenModule::getLLVMLifetimeStartFn() { if (LifetimeStartFn) return LifetimeStartFn; LifetimeStartFn = llvm::Intrinsic::getDeclaration(&getModule(), llvm::Intrinsic::lifetime_start); return LifetimeStartFn; } /// Lazily declare the @@llvm.lifetime.end intrinsic. llvm::Constant *CodeGenModule::getLLVMLifetimeEndFn() { if (LifetimeEndFn) return LifetimeEndFn; LifetimeEndFn = llvm::Intrinsic::getDeclaration(&getModule(), llvm::Intrinsic::lifetime_end); return LifetimeEndFn; } namespace { /// A cleanup to perform a release of an object at the end of a /// function. This is used to balance out the incoming +1 of a /// ns_consumed argument when we can't reasonably do that just by /// not doing the initial retain for a __block argument. struct ConsumeARCParameter : EHScopeStack::Cleanup { ConsumeARCParameter(llvm::Value *param, ARCPreciseLifetime_t precise) : Param(param), Precise(precise) {} llvm::Value *Param; ARCPreciseLifetime_t Precise; void Emit(CodeGenFunction &CGF, Flags flags) override { CGF.EmitARCRelease(Param, Precise); } }; } /// Emit an alloca (or GlobalValue depending on target) /// for the specified parameter and set up LocalDeclMap. void CodeGenFunction::EmitParmDecl(const VarDecl &D, llvm::Value *Arg, bool ArgIsPointer, unsigned ArgNo) { // FIXME: Why isn't ImplicitParamDecl a ParmVarDecl? assert((isa(D) || isa(D)) && "Invalid argument to EmitParmDecl"); Arg->setName(D.getName()); QualType Ty = D.getType(); // Use better IR generation for certain implicit parameters. if (isa(D)) { // The only implicit argument a block has is its literal. if (BlockInfo) { LocalDeclMap[&D] = Arg; llvm::Value *LocalAddr = nullptr; if (CGM.getCodeGenOpts().OptimizationLevel == 0) { // Allocate a stack slot to let the debug info survive the RA. llvm::AllocaInst *Alloc = CreateTempAlloca(ConvertTypeForMem(Ty), D.getName() + ".addr"); Alloc->setAlignment(getContext().getDeclAlign(&D).getQuantity()); LValue lv = MakeAddrLValue(Alloc, Ty, getContext().getDeclAlign(&D)); EmitStoreOfScalar(Arg, lv, /* isInitialization */ true); LocalAddr = Builder.CreateLoad(Alloc); } if (CGDebugInfo *DI = getDebugInfo()) { if (CGM.getCodeGenOpts().getDebugInfo() >= CodeGenOptions::LimitedDebugInfo) { DI->setLocation(D.getLocation()); DI->EmitDeclareOfBlockLiteralArgVariable(*BlockInfo, Arg, ArgNo, LocalAddr, Builder); } } return; } } llvm::Value *DeclPtr; bool DoStore = false; bool IsScalar = hasScalarEvaluationKind(Ty); CharUnits Align = getContext().getDeclAlign(&D); // If we already have a pointer to the argument, reuse the input pointer. if (ArgIsPointer) { // If we have a prettier pointer type at this point, bitcast to that. unsigned AS = cast(Arg->getType())->getAddressSpace(); llvm::Type *IRTy = ConvertTypeForMem(Ty)->getPointerTo(AS); DeclPtr = Arg->getType() == IRTy ? Arg : Builder.CreateBitCast(Arg, IRTy, D.getName()); // Push a destructor cleanup for this parameter if the ABI requires it. // Don't push a cleanup in a thunk for a method that will also emit a // cleanup. if (!IsScalar && !CurFuncIsThunk && getTarget().getCXXABI().areArgsDestroyedLeftToRightInCallee()) { const CXXRecordDecl *RD = Ty->getAsCXXRecordDecl(); if (RD && RD->hasNonTrivialDestructor()) pushDestroy(QualType::DK_cxx_destructor, DeclPtr, Ty); } } else { // Otherwise, create a temporary to hold the value. llvm::AllocaInst *Alloc = CreateTempAlloca(ConvertTypeForMem(Ty), D.getName() + ".addr"); Alloc->setAlignment(Align.getQuantity()); DeclPtr = Alloc; DoStore = true; } LValue lv = MakeAddrLValue(DeclPtr, Ty, Align); if (IsScalar) { Qualifiers qs = Ty.getQualifiers(); if (Qualifiers::ObjCLifetime lt = qs.getObjCLifetime()) { // We honor __attribute__((ns_consumed)) for types with lifetime. // For __strong, it's handled by just skipping the initial retain; // otherwise we have to balance out the initial +1 with an extra // cleanup to do the release at the end of the function. bool isConsumed = D.hasAttr(); // 'self' is always formally __strong, but if this is not an // init method then we don't want to retain it. if (D.isARCPseudoStrong()) { const ObjCMethodDecl *method = cast(CurCodeDecl); assert(&D == method->getSelfDecl()); assert(lt == Qualifiers::OCL_Strong); assert(qs.hasConst()); assert(method->getMethodFamily() != OMF_init); (void) method; lt = Qualifiers::OCL_ExplicitNone; } if (lt == Qualifiers::OCL_Strong) { if (!isConsumed) { if (CGM.getCodeGenOpts().OptimizationLevel == 0) { // use objc_storeStrong(&dest, value) for retaining the // object. But first, store a null into 'dest' because // objc_storeStrong attempts to release its old value. llvm::Value *Null = CGM.EmitNullConstant(D.getType()); EmitStoreOfScalar(Null, lv, /* isInitialization */ true); EmitARCStoreStrongCall(lv.getAddress(), Arg, true); DoStore = false; } else // Don't use objc_retainBlock for block pointers, because we // don't want to Block_copy something just because we got it // as a parameter. Arg = EmitARCRetainNonBlock(Arg); } } else { // Push the cleanup for a consumed parameter. if (isConsumed) { ARCPreciseLifetime_t precise = (D.hasAttr() ? ARCPreciseLifetime : ARCImpreciseLifetime); EHStack.pushCleanup(getARCCleanupKind(), Arg, precise); } if (lt == Qualifiers::OCL_Weak) { EmitARCInitWeak(DeclPtr, Arg); DoStore = false; // The weak init is a store, no need to do two. } } // Enter the cleanup scope. EmitAutoVarWithLifetime(*this, D, DeclPtr, lt); } } // Store the initial value into the alloca. if (DoStore) EmitStoreOfScalar(Arg, lv, /* isInitialization */ true); llvm::Value *&DMEntry = LocalDeclMap[&D]; assert(!DMEntry && "Decl already exists in localdeclmap!"); DMEntry = DeclPtr; // Emit debug info for param declaration. if (CGDebugInfo *DI = getDebugInfo()) { if (CGM.getCodeGenOpts().getDebugInfo() >= CodeGenOptions::LimitedDebugInfo) { DI->EmitDeclareOfArgVariable(&D, DeclPtr, ArgNo, Builder); } } if (D.hasAttr()) EmitVarAnnotations(&D, DeclPtr); } @ 1.1.1.3.4.1 log @file CGDecl.cpp was added on branch yamt-pagecache on 2014-05-22 16:18:26 +0000 @ text @d1 1748 @ 1.1.1.3.4.2 log @sync with head. for a reference, the tree before this commit was tagged as yamt-pagecache-tag8. this commit was splitted into small chunks to avoid a limitation of cvs. ("Protocol error: too many arguments") @ text @a0 1748 //===--- CGDecl.cpp - Emit LLVM Code for declarations ---------------------===// // // The LLVM Compiler Infrastructure // // This file is distributed under the University of Illinois Open Source // License. See LICENSE.TXT for details. // //===----------------------------------------------------------------------===// // // This contains code to emit Decl nodes as LLVM code. // //===----------------------------------------------------------------------===// #include "CodeGenFunction.h" #include "CGDebugInfo.h" #include "CGOpenCLRuntime.h" #include "CodeGenModule.h" #include "clang/AST/ASTContext.h" #include "clang/AST/CharUnits.h" #include "clang/AST/Decl.h" #include "clang/AST/DeclObjC.h" #include "clang/Basic/SourceManager.h" #include "clang/Basic/TargetInfo.h" #include "clang/CodeGen/CGFunctionInfo.h" #include "clang/Frontend/CodeGenOptions.h" #include "llvm/IR/DataLayout.h" #include "llvm/IR/GlobalVariable.h" #include "llvm/IR/Intrinsics.h" #include "llvm/IR/Type.h" using namespace clang; using namespace CodeGen; void CodeGenFunction::EmitDecl(const Decl &D) { switch (D.getKind()) { case Decl::TranslationUnit: case Decl::Namespace: case Decl::UnresolvedUsingTypename: case Decl::ClassTemplateSpecialization: case Decl::ClassTemplatePartialSpecialization: case Decl::VarTemplateSpecialization: case Decl::VarTemplatePartialSpecialization: case Decl::TemplateTypeParm: case Decl::UnresolvedUsingValue: case Decl::NonTypeTemplateParm: case Decl::CXXMethod: case Decl::CXXConstructor: case Decl::CXXDestructor: case Decl::CXXConversion: case Decl::Field: case Decl::MSProperty: case Decl::IndirectField: case Decl::ObjCIvar: case Decl::ObjCAtDefsField: case Decl::ParmVar: case Decl::ImplicitParam: case Decl::ClassTemplate: case Decl::VarTemplate: case Decl::FunctionTemplate: case Decl::TypeAliasTemplate: case Decl::TemplateTemplateParm: case Decl::ObjCMethod: case Decl::ObjCCategory: case Decl::ObjCProtocol: case Decl::ObjCInterface: case Decl::ObjCCategoryImpl: case Decl::ObjCImplementation: case Decl::ObjCProperty: case Decl::ObjCCompatibleAlias: case Decl::AccessSpec: case Decl::LinkageSpec: case Decl::ObjCPropertyImpl: case Decl::FileScopeAsm: case Decl::Friend: case Decl::FriendTemplate: case Decl::Block: case Decl::Captured: case Decl::ClassScopeFunctionSpecialization: case Decl::UsingShadow: llvm_unreachable("Declaration should not be in declstmts!"); case Decl::Function: // void X(); case Decl::Record: // struct/union/class X; case Decl::Enum: // enum X; case Decl::EnumConstant: // enum ? { X = ? } case Decl::CXXRecord: // struct/union/class X; [C++] case Decl::StaticAssert: // static_assert(X, ""); [C++0x] case Decl::Label: // __label__ x; case Decl::Import: case Decl::OMPThreadPrivate: case Decl::Empty: // None of these decls require codegen support. return; case Decl::NamespaceAlias: if (CGDebugInfo *DI = getDebugInfo()) DI->EmitNamespaceAlias(cast(D)); return; case Decl::Using: // using X; [C++] if (CGDebugInfo *DI = getDebugInfo()) DI->EmitUsingDecl(cast(D)); return; case Decl::UsingDirective: // using namespace X; [C++] if (CGDebugInfo *DI = getDebugInfo()) DI->EmitUsingDirective(cast(D)); return; case Decl::Var: { const VarDecl &VD = cast(D); assert(VD.isLocalVarDecl() && "Should not see file-scope variables inside a function!"); return EmitVarDecl(VD); } case Decl::Typedef: // typedef int X; case Decl::TypeAlias: { // using X = int; [C++0x] const TypedefNameDecl &TD = cast(D); QualType Ty = TD.getUnderlyingType(); if (Ty->isVariablyModifiedType()) EmitVariablyModifiedType(Ty); } } } /// EmitVarDecl - This method handles emission of any variable declaration /// inside a function, including static vars etc. void CodeGenFunction::EmitVarDecl(const VarDecl &D) { if (D.isStaticLocal()) { llvm::GlobalValue::LinkageTypes Linkage = llvm::GlobalValue::InternalLinkage; // If the variable is externally visible, it must have weak linkage so it // can be uniqued. if (D.isExternallyVisible()) { Linkage = llvm::GlobalValue::LinkOnceODRLinkage; // FIXME: We need to force the emission/use of a guard variable for // some variables even if we can constant-evaluate them because // we can't guarantee every translation unit will constant-evaluate them. } return EmitStaticVarDecl(D, Linkage); } if (D.hasExternalStorage()) // Don't emit it now, allow it to be emitted lazily on its first use. return; if (D.getStorageClass() == SC_OpenCLWorkGroupLocal) return CGM.getOpenCLRuntime().EmitWorkGroupLocalVarDecl(*this, D); assert(D.hasLocalStorage()); return EmitAutoVarDecl(D); } static std::string GetStaticDeclName(CodeGenFunction &CGF, const VarDecl &D, const char *Separator) { CodeGenModule &CGM = CGF.CGM; if (CGF.getLangOpts().CPlusPlus) { StringRef Name = CGM.getMangledName(&D); return Name.str(); } std::string ContextName; if (!CGF.CurFuncDecl) { // Better be in a block declared in global scope. const NamedDecl *ND = cast(&D); const DeclContext *DC = ND->getDeclContext(); if (const BlockDecl *BD = dyn_cast(DC)) { MangleBuffer Name; CGM.getBlockMangledName(GlobalDecl(), Name, BD); ContextName = Name.getString(); } else llvm_unreachable("Unknown context for block static var decl"); } else if (const FunctionDecl *FD = dyn_cast(CGF.CurFuncDecl)) { StringRef Name = CGM.getMangledName(FD); ContextName = Name.str(); } else if (isa(CGF.CurFuncDecl)) ContextName = CGF.CurFn->getName(); else llvm_unreachable("Unknown context for static var decl"); return ContextName + Separator + D.getNameAsString(); } llvm::GlobalVariable * CodeGenFunction::CreateStaticVarDecl(const VarDecl &D, const char *Separator, llvm::GlobalValue::LinkageTypes Linkage) { QualType Ty = D.getType(); assert(Ty->isConstantSizeType() && "VLAs can't be static"); // Use the label if the variable is renamed with the asm-label extension. std::string Name; if (D.hasAttr()) Name = CGM.getMangledName(&D); else Name = GetStaticDeclName(*this, D, Separator); llvm::Type *LTy = CGM.getTypes().ConvertTypeForMem(Ty); unsigned AddrSpace = CGM.GetGlobalVarAddressSpace(&D, CGM.getContext().getTargetAddressSpace(Ty)); llvm::GlobalVariable *GV = new llvm::GlobalVariable(CGM.getModule(), LTy, Ty.isConstant(getContext()), Linkage, CGM.EmitNullConstant(D.getType()), Name, 0, llvm::GlobalVariable::NotThreadLocal, AddrSpace); GV->setAlignment(getContext().getDeclAlign(&D).getQuantity()); CGM.setGlobalVisibility(GV, &D); if (D.getTLSKind()) CGM.setTLSMode(GV, D); return GV; } /// hasNontrivialDestruction - Determine whether a type's destruction is /// non-trivial. If so, and the variable uses static initialization, we must /// register its destructor to run on exit. static bool hasNontrivialDestruction(QualType T) { CXXRecordDecl *RD = T->getBaseElementTypeUnsafe()->getAsCXXRecordDecl(); return RD && !RD->hasTrivialDestructor(); } /// AddInitializerToStaticVarDecl - Add the initializer for 'D' to the /// global variable that has already been created for it. If the initializer /// has a different type than GV does, this may free GV and return a different /// one. Otherwise it just returns GV. llvm::GlobalVariable * CodeGenFunction::AddInitializerToStaticVarDecl(const VarDecl &D, llvm::GlobalVariable *GV) { llvm::Constant *Init = CGM.EmitConstantInit(D, this); // If constant emission failed, then this should be a C++ static // initializer. if (!Init) { if (!getLangOpts().CPlusPlus) CGM.ErrorUnsupported(D.getInit(), "constant l-value expression"); else if (Builder.GetInsertBlock()) { // Since we have a static initializer, this global variable can't // be constant. GV->setConstant(false); EmitCXXGuardedInit(D, GV, /*PerformInit*/true); } return GV; } // The initializer may differ in type from the global. Rewrite // the global to match the initializer. (We have to do this // because some types, like unions, can't be completely represented // in the LLVM type system.) if (GV->getType()->getElementType() != Init->getType()) { llvm::GlobalVariable *OldGV = GV; GV = new llvm::GlobalVariable(CGM.getModule(), Init->getType(), OldGV->isConstant(), OldGV->getLinkage(), Init, "", /*InsertBefore*/ OldGV, OldGV->getThreadLocalMode(), CGM.getContext().getTargetAddressSpace(D.getType())); GV->setVisibility(OldGV->getVisibility()); // Steal the name of the old global GV->takeName(OldGV); // Replace all uses of the old global with the new global llvm::Constant *NewPtrForOldDecl = llvm::ConstantExpr::getBitCast(GV, OldGV->getType()); OldGV->replaceAllUsesWith(NewPtrForOldDecl); // Erase the old global, since it is no longer used. OldGV->eraseFromParent(); } GV->setConstant(CGM.isTypeConstant(D.getType(), true)); GV->setInitializer(Init); if (hasNontrivialDestruction(D.getType())) { // We have a constant initializer, but a nontrivial destructor. We still // need to perform a guarded "initialization" in order to register the // destructor. EmitCXXGuardedInit(D, GV, /*PerformInit*/false); } return GV; } void CodeGenFunction::EmitStaticVarDecl(const VarDecl &D, llvm::GlobalValue::LinkageTypes Linkage) { llvm::Value *&DMEntry = LocalDeclMap[&D]; assert(DMEntry == 0 && "Decl already exists in localdeclmap!"); // Check to see if we already have a global variable for this // declaration. This can happen when double-emitting function // bodies, e.g. with complete and base constructors. llvm::Constant *addr = CGM.getStaticLocalDeclAddress(&D); llvm::GlobalVariable *var; if (addr) { var = cast(addr->stripPointerCasts()); } else { addr = var = CreateStaticVarDecl(D, ".", Linkage); } // Store into LocalDeclMap before generating initializer to handle // circular references. DMEntry = addr; CGM.setStaticLocalDeclAddress(&D, addr); // We can't have a VLA here, but we can have a pointer to a VLA, // even though that doesn't really make any sense. // Make sure to evaluate VLA bounds now so that we have them for later. if (D.getType()->isVariablyModifiedType()) EmitVariablyModifiedType(D.getType()); // Save the type in case adding the initializer forces a type change. llvm::Type *expectedType = addr->getType(); // If this value has an initializer, emit it. if (D.getInit()) var = AddInitializerToStaticVarDecl(D, var); var->setAlignment(getContext().getDeclAlign(&D).getQuantity()); if (D.hasAttr()) CGM.AddGlobalAnnotations(&D, var); if (const SectionAttr *SA = D.getAttr()) var->setSection(SA->getName()); if (D.hasAttr()) CGM.AddUsedGlobal(var); // We may have to cast the constant because of the initializer // mismatch above. // // FIXME: It is really dangerous to store this in the map; if anyone // RAUW's the GV uses of this constant will be invalid. llvm::Constant *castedAddr = llvm::ConstantExpr::getBitCast(var, expectedType); DMEntry = castedAddr; CGM.setStaticLocalDeclAddress(&D, castedAddr); // Emit global variable debug descriptor for static vars. CGDebugInfo *DI = getDebugInfo(); if (DI && CGM.getCodeGenOpts().getDebugInfo() >= CodeGenOptions::LimitedDebugInfo) { DI->setLocation(D.getLocation()); DI->EmitGlobalVariable(var, &D); } } namespace { struct DestroyObject : EHScopeStack::Cleanup { DestroyObject(llvm::Value *addr, QualType type, CodeGenFunction::Destroyer *destroyer, bool useEHCleanupForArray) : addr(addr), type(type), destroyer(destroyer), useEHCleanupForArray(useEHCleanupForArray) {} llvm::Value *addr; QualType type; CodeGenFunction::Destroyer *destroyer; bool useEHCleanupForArray; void Emit(CodeGenFunction &CGF, Flags flags) { // Don't use an EH cleanup recursively from an EH cleanup. bool useEHCleanupForArray = flags.isForNormalCleanup() && this->useEHCleanupForArray; CGF.emitDestroy(addr, type, destroyer, useEHCleanupForArray); } }; struct DestroyNRVOVariable : EHScopeStack::Cleanup { DestroyNRVOVariable(llvm::Value *addr, const CXXDestructorDecl *Dtor, llvm::Value *NRVOFlag) : Dtor(Dtor), NRVOFlag(NRVOFlag), Loc(addr) {} const CXXDestructorDecl *Dtor; llvm::Value *NRVOFlag; llvm::Value *Loc; void Emit(CodeGenFunction &CGF, Flags flags) { // Along the exceptions path we always execute the dtor. bool NRVO = flags.isForNormalCleanup() && NRVOFlag; llvm::BasicBlock *SkipDtorBB = 0; if (NRVO) { // If we exited via NRVO, we skip the destructor call. llvm::BasicBlock *RunDtorBB = CGF.createBasicBlock("nrvo.unused"); SkipDtorBB = CGF.createBasicBlock("nrvo.skipdtor"); llvm::Value *DidNRVO = CGF.Builder.CreateLoad(NRVOFlag, "nrvo.val"); CGF.Builder.CreateCondBr(DidNRVO, SkipDtorBB, RunDtorBB); CGF.EmitBlock(RunDtorBB); } CGF.EmitCXXDestructorCall(Dtor, Dtor_Complete, /*ForVirtualBase=*/false, /*Delegating=*/false, Loc); if (NRVO) CGF.EmitBlock(SkipDtorBB); } }; struct CallStackRestore : EHScopeStack::Cleanup { llvm::Value *Stack; CallStackRestore(llvm::Value *Stack) : Stack(Stack) {} void Emit(CodeGenFunction &CGF, Flags flags) { llvm::Value *V = CGF.Builder.CreateLoad(Stack); llvm::Value *F = CGF.CGM.getIntrinsic(llvm::Intrinsic::stackrestore); CGF.Builder.CreateCall(F, V); } }; struct ExtendGCLifetime : EHScopeStack::Cleanup { const VarDecl &Var; ExtendGCLifetime(const VarDecl *var) : Var(*var) {} void Emit(CodeGenFunction &CGF, Flags flags) { // Compute the address of the local variable, in case it's a // byref or something. DeclRefExpr DRE(const_cast(&Var), false, Var.getType(), VK_LValue, SourceLocation()); llvm::Value *value = CGF.EmitLoadOfScalar(CGF.EmitDeclRefLValue(&DRE), SourceLocation()); CGF.EmitExtendGCLifetime(value); } }; struct CallCleanupFunction : EHScopeStack::Cleanup { llvm::Constant *CleanupFn; const CGFunctionInfo &FnInfo; const VarDecl &Var; CallCleanupFunction(llvm::Constant *CleanupFn, const CGFunctionInfo *Info, const VarDecl *Var) : CleanupFn(CleanupFn), FnInfo(*Info), Var(*Var) {} void Emit(CodeGenFunction &CGF, Flags flags) { DeclRefExpr DRE(const_cast(&Var), false, Var.getType(), VK_LValue, SourceLocation()); // Compute the address of the local variable, in case it's a byref // or something. llvm::Value *Addr = CGF.EmitDeclRefLValue(&DRE).getAddress(); // In some cases, the type of the function argument will be different from // the type of the pointer. An example of this is // void f(void* arg); // __attribute__((cleanup(f))) void *g; // // To fix this we insert a bitcast here. QualType ArgTy = FnInfo.arg_begin()->type; llvm::Value *Arg = CGF.Builder.CreateBitCast(Addr, CGF.ConvertType(ArgTy)); CallArgList Args; Args.add(RValue::get(Arg), CGF.getContext().getPointerType(Var.getType())); CGF.EmitCall(FnInfo, CleanupFn, ReturnValueSlot(), Args); } }; /// A cleanup to call @@llvm.lifetime.end. class CallLifetimeEnd : public EHScopeStack::Cleanup { llvm::Value *Addr; llvm::Value *Size; public: CallLifetimeEnd(llvm::Value *addr, llvm::Value *size) : Addr(addr), Size(size) {} void Emit(CodeGenFunction &CGF, Flags flags) { llvm::Value *castAddr = CGF.Builder.CreateBitCast(Addr, CGF.Int8PtrTy); CGF.Builder.CreateCall2(CGF.CGM.getLLVMLifetimeEndFn(), Size, castAddr) ->setDoesNotThrow(); } }; } /// EmitAutoVarWithLifetime - Does the setup required for an automatic /// variable with lifetime. static void EmitAutoVarWithLifetime(CodeGenFunction &CGF, const VarDecl &var, llvm::Value *addr, Qualifiers::ObjCLifetime lifetime) { switch (lifetime) { case Qualifiers::OCL_None: llvm_unreachable("present but none"); case Qualifiers::OCL_ExplicitNone: // nothing to do break; case Qualifiers::OCL_Strong: { CodeGenFunction::Destroyer *destroyer = (var.hasAttr() ? CodeGenFunction::destroyARCStrongPrecise : CodeGenFunction::destroyARCStrongImprecise); CleanupKind cleanupKind = CGF.getARCCleanupKind(); CGF.pushDestroy(cleanupKind, addr, var.getType(), destroyer, cleanupKind & EHCleanup); break; } case Qualifiers::OCL_Autoreleasing: // nothing to do break; case Qualifiers::OCL_Weak: // __weak objects always get EH cleanups; otherwise, exceptions // could cause really nasty crashes instead of mere leaks. CGF.pushDestroy(NormalAndEHCleanup, addr, var.getType(), CodeGenFunction::destroyARCWeak, /*useEHCleanup*/ true); break; } } static bool isAccessedBy(const VarDecl &var, const Stmt *s) { if (const Expr *e = dyn_cast(s)) { // Skip the most common kinds of expressions that make // hierarchy-walking expensive. s = e = e->IgnoreParenCasts(); if (const DeclRefExpr *ref = dyn_cast(e)) return (ref->getDecl() == &var); if (const BlockExpr *be = dyn_cast(e)) { const BlockDecl *block = be->getBlockDecl(); for (BlockDecl::capture_const_iterator i = block->capture_begin(), e = block->capture_end(); i != e; ++i) { if (i->getVariable() == &var) return true; } } } for (Stmt::const_child_range children = s->children(); children; ++children) // children might be null; as in missing decl or conditional of an if-stmt. if ((*children) && isAccessedBy(var, *children)) return true; return false; } static bool isAccessedBy(const ValueDecl *decl, const Expr *e) { if (!decl) return false; if (!isa(decl)) return false; const VarDecl *var = cast(decl); return isAccessedBy(*var, e); } static void drillIntoBlockVariable(CodeGenFunction &CGF, LValue &lvalue, const VarDecl *var) { lvalue.setAddress(CGF.BuildBlockByrefAddress(lvalue.getAddress(), var)); } void CodeGenFunction::EmitScalarInit(const Expr *init, const ValueDecl *D, LValue lvalue, bool capturedByInit) { Qualifiers::ObjCLifetime lifetime = lvalue.getObjCLifetime(); if (!lifetime) { llvm::Value *value = EmitScalarExpr(init); if (capturedByInit) drillIntoBlockVariable(*this, lvalue, cast(D)); EmitStoreThroughLValue(RValue::get(value), lvalue, true); return; } // If we're emitting a value with lifetime, we have to do the // initialization *before* we leave the cleanup scopes. if (const ExprWithCleanups *ewc = dyn_cast(init)) { enterFullExpression(ewc); init = ewc->getSubExpr(); } CodeGenFunction::RunCleanupsScope Scope(*this); // We have to maintain the illusion that the variable is // zero-initialized. If the variable might be accessed in its // initializer, zero-initialize before running the initializer, then // actually perform the initialization with an assign. bool accessedByInit = false; if (lifetime != Qualifiers::OCL_ExplicitNone) accessedByInit = (capturedByInit || isAccessedBy(D, init)); if (accessedByInit) { LValue tempLV = lvalue; // Drill down to the __block object if necessary. if (capturedByInit) { // We can use a simple GEP for this because it can't have been // moved yet. tempLV.setAddress(Builder.CreateStructGEP(tempLV.getAddress(), getByRefValueLLVMField(cast(D)))); } llvm::PointerType *ty = cast(tempLV.getAddress()->getType()); ty = cast(ty->getElementType()); llvm::Value *zero = llvm::ConstantPointerNull::get(ty); // If __weak, we want to use a barrier under certain conditions. if (lifetime == Qualifiers::OCL_Weak) EmitARCInitWeak(tempLV.getAddress(), zero); // Otherwise just do a simple store. else EmitStoreOfScalar(zero, tempLV, /* isInitialization */ true); } // Emit the initializer. llvm::Value *value = 0; switch (lifetime) { case Qualifiers::OCL_None: llvm_unreachable("present but none"); case Qualifiers::OCL_ExplicitNone: // nothing to do value = EmitScalarExpr(init); break; case Qualifiers::OCL_Strong: { value = EmitARCRetainScalarExpr(init); break; } case Qualifiers::OCL_Weak: { // No way to optimize a producing initializer into this. It's not // worth optimizing for, because the value will immediately // disappear in the common case. value = EmitScalarExpr(init); if (capturedByInit) drillIntoBlockVariable(*this, lvalue, cast(D)); if (accessedByInit) EmitARCStoreWeak(lvalue.getAddress(), value, /*ignored*/ true); else EmitARCInitWeak(lvalue.getAddress(), value); return; } case Qualifiers::OCL_Autoreleasing: value = EmitARCRetainAutoreleaseScalarExpr(init); break; } if (capturedByInit) drillIntoBlockVariable(*this, lvalue, cast(D)); // If the variable might have been accessed by its initializer, we // might have to initialize with a barrier. We have to do this for // both __weak and __strong, but __weak got filtered out above. if (accessedByInit && lifetime == Qualifiers::OCL_Strong) { llvm::Value *oldValue = EmitLoadOfScalar(lvalue, init->getExprLoc()); EmitStoreOfScalar(value, lvalue, /* isInitialization */ true); EmitARCRelease(oldValue, ARCImpreciseLifetime); return; } EmitStoreOfScalar(value, lvalue, /* isInitialization */ true); } /// EmitScalarInit - Initialize the given lvalue with the given object. void CodeGenFunction::EmitScalarInit(llvm::Value *init, LValue lvalue) { Qualifiers::ObjCLifetime lifetime = lvalue.getObjCLifetime(); if (!lifetime) return EmitStoreThroughLValue(RValue::get(init), lvalue, true); switch (lifetime) { case Qualifiers::OCL_None: llvm_unreachable("present but none"); case Qualifiers::OCL_ExplicitNone: // nothing to do break; case Qualifiers::OCL_Strong: init = EmitARCRetain(lvalue.getType(), init); break; case Qualifiers::OCL_Weak: // Initialize and then skip the primitive store. EmitARCInitWeak(lvalue.getAddress(), init); return; case Qualifiers::OCL_Autoreleasing: init = EmitARCRetainAutorelease(lvalue.getType(), init); break; } EmitStoreOfScalar(init, lvalue, /* isInitialization */ true); } /// canEmitInitWithFewStoresAfterMemset - Decide whether we can emit the /// non-zero parts of the specified initializer with equal or fewer than /// NumStores scalar stores. static bool canEmitInitWithFewStoresAfterMemset(llvm::Constant *Init, unsigned &NumStores) { // Zero and Undef never requires any extra stores. if (isa(Init) || isa(Init) || isa(Init)) return true; if (isa(Init) || isa(Init) || isa(Init) || isa(Init) || isa(Init)) return Init->isNullValue() || NumStores--; // See if we can emit each element. if (isa(Init) || isa(Init)) { for (unsigned i = 0, e = Init->getNumOperands(); i != e; ++i) { llvm::Constant *Elt = cast(Init->getOperand(i)); if (!canEmitInitWithFewStoresAfterMemset(Elt, NumStores)) return false; } return true; } if (llvm::ConstantDataSequential *CDS = dyn_cast(Init)) { for (unsigned i = 0, e = CDS->getNumElements(); i != e; ++i) { llvm::Constant *Elt = CDS->getElementAsConstant(i); if (!canEmitInitWithFewStoresAfterMemset(Elt, NumStores)) return false; } return true; } // Anything else is hard and scary. return false; } /// emitStoresForInitAfterMemset - For inits that /// canEmitInitWithFewStoresAfterMemset returned true for, emit the scalar /// stores that would be required. static void emitStoresForInitAfterMemset(llvm::Constant *Init, llvm::Value *Loc, bool isVolatile, CGBuilderTy &Builder) { assert(!Init->isNullValue() && !isa(Init) && "called emitStoresForInitAfterMemset for zero or undef value."); if (isa(Init) || isa(Init) || isa(Init) || isa(Init) || isa(Init)) { Builder.CreateStore(Init, Loc, isVolatile); return; } if (llvm::ConstantDataSequential *CDS = dyn_cast(Init)) { for (unsigned i = 0, e = CDS->getNumElements(); i != e; ++i) { llvm::Constant *Elt = CDS->getElementAsConstant(i); // If necessary, get a pointer to the element and emit it. if (!Elt->isNullValue() && !isa(Elt)) emitStoresForInitAfterMemset(Elt, Builder.CreateConstGEP2_32(Loc, 0, i), isVolatile, Builder); } return; } assert((isa(Init) || isa(Init)) && "Unknown value type!"); for (unsigned i = 0, e = Init->getNumOperands(); i != e; ++i) { llvm::Constant *Elt = cast(Init->getOperand(i)); // If necessary, get a pointer to the element and emit it. if (!Elt->isNullValue() && !isa(Elt)) emitStoresForInitAfterMemset(Elt, Builder.CreateConstGEP2_32(Loc, 0, i), isVolatile, Builder); } } /// shouldUseMemSetPlusStoresToInitialize - Decide whether we should use memset /// plus some stores to initialize a local variable instead of using a memcpy /// from a constant global. It is beneficial to use memset if the global is all /// zeros, or mostly zeros and large. static bool shouldUseMemSetPlusStoresToInitialize(llvm::Constant *Init, uint64_t GlobalSize) { // If a global is all zeros, always use a memset. if (isa(Init)) return true; // If a non-zero global is <= 32 bytes, always use a memcpy. If it is large, // do it if it will require 6 or fewer scalar stores. // TODO: Should budget depends on the size? Avoiding a large global warrants // plopping in more stores. unsigned StoreBudget = 6; uint64_t SizeLimit = 32; return GlobalSize > SizeLimit && canEmitInitWithFewStoresAfterMemset(Init, StoreBudget); } /// Should we use the LLVM lifetime intrinsics for the given local variable? static bool shouldUseLifetimeMarkers(CodeGenFunction &CGF, const VarDecl &D, unsigned Size) { // Always emit lifetime markers in -fsanitize=use-after-scope mode. if (CGF.getLangOpts().Sanitize.UseAfterScope) return true; // For now, only in optimized builds. if (CGF.CGM.getCodeGenOpts().OptimizationLevel == 0) return false; // Limit the size of marked objects to 32 bytes. We don't want to increase // compile time by marking tiny objects. unsigned SizeThreshold = 32; return Size > SizeThreshold; } /// EmitAutoVarDecl - Emit code and set up an entry in LocalDeclMap for a /// variable declaration with auto, register, or no storage class specifier. /// These turn into simple stack objects, or GlobalValues depending on target. void CodeGenFunction::EmitAutoVarDecl(const VarDecl &D) { AutoVarEmission emission = EmitAutoVarAlloca(D); EmitAutoVarInit(emission); EmitAutoVarCleanups(emission); } /// EmitAutoVarAlloca - Emit the alloca and debug information for a /// local variable. Does not emit initialization or destruction. CodeGenFunction::AutoVarEmission CodeGenFunction::EmitAutoVarAlloca(const VarDecl &D) { QualType Ty = D.getType(); AutoVarEmission emission(D); bool isByRef = D.hasAttr(); emission.IsByRef = isByRef; CharUnits alignment = getContext().getDeclAlign(&D); emission.Alignment = alignment; // If the type is variably-modified, emit all the VLA sizes for it. if (Ty->isVariablyModifiedType()) EmitVariablyModifiedType(Ty); llvm::Value *DeclPtr; if (Ty->isConstantSizeType()) { bool NRVO = getLangOpts().ElideConstructors && D.isNRVOVariable(); // If this value is an array or struct with a statically determinable // constant initializer, there are optimizations we can do. // // TODO: We should constant-evaluate the initializer of any variable, // as long as it is initialized by a constant expression. Currently, // isConstantInitializer produces wrong answers for structs with // reference or bitfield members, and a few other cases, and checking // for POD-ness protects us from some of these. if (D.getInit() && (Ty->isArrayType() || Ty->isRecordType()) && (D.isConstexpr() || ((Ty.isPODType(getContext()) || getContext().getBaseElementType(Ty)->isObjCObjectPointerType()) && D.getInit()->isConstantInitializer(getContext(), false)))) { // If the variable's a const type, and it's neither an NRVO // candidate nor a __block variable and has no mutable members, // emit it as a global instead. if (CGM.getCodeGenOpts().MergeAllConstants && !NRVO && !isByRef && CGM.isTypeConstant(Ty, true)) { EmitStaticVarDecl(D, llvm::GlobalValue::InternalLinkage); emission.Address = 0; // signal this condition to later callbacks assert(emission.wasEmittedAsGlobal()); return emission; } // Otherwise, tell the initialization code that we're in this case. emission.IsConstantAggregate = true; } // A normal fixed sized variable becomes an alloca in the entry block, // unless it's an NRVO variable. llvm::Type *LTy = ConvertTypeForMem(Ty); if (NRVO) { // The named return value optimization: allocate this variable in the // return slot, so that we can elide the copy when returning this // variable (C++0x [class.copy]p34). DeclPtr = ReturnValue; if (const RecordType *RecordTy = Ty->getAs()) { if (!cast(RecordTy->getDecl())->hasTrivialDestructor()) { // Create a flag that is used to indicate when the NRVO was applied // to this variable. Set it to zero to indicate that NRVO was not // applied. llvm::Value *Zero = Builder.getFalse(); llvm::Value *NRVOFlag = CreateTempAlloca(Zero->getType(), "nrvo"); EnsureInsertPoint(); Builder.CreateStore(Zero, NRVOFlag); // Record the NRVO flag for this variable. NRVOFlags[&D] = NRVOFlag; emission.NRVOFlag = NRVOFlag; } } } else { if (isByRef) LTy = BuildByRefType(&D); llvm::AllocaInst *Alloc = CreateTempAlloca(LTy); Alloc->setName(D.getName()); CharUnits allocaAlignment = alignment; if (isByRef) allocaAlignment = std::max(allocaAlignment, getContext().toCharUnitsFromBits(getTarget().getPointerAlign(0))); Alloc->setAlignment(allocaAlignment.getQuantity()); DeclPtr = Alloc; // Emit a lifetime intrinsic if meaningful. There's no point // in doing this if we don't have a valid insertion point (?). uint64_t size = CGM.getDataLayout().getTypeAllocSize(LTy); if (HaveInsertPoint() && shouldUseLifetimeMarkers(*this, D, size)) { llvm::Value *sizeV = llvm::ConstantInt::get(Int64Ty, size); emission.SizeForLifetimeMarkers = sizeV; llvm::Value *castAddr = Builder.CreateBitCast(Alloc, Int8PtrTy); Builder.CreateCall2(CGM.getLLVMLifetimeStartFn(), sizeV, castAddr) ->setDoesNotThrow(); } else { assert(!emission.useLifetimeMarkers()); } } } else { EnsureInsertPoint(); if (!DidCallStackSave) { // Save the stack. llvm::Value *Stack = CreateTempAlloca(Int8PtrTy, "saved_stack"); llvm::Value *F = CGM.getIntrinsic(llvm::Intrinsic::stacksave); llvm::Value *V = Builder.CreateCall(F); Builder.CreateStore(V, Stack); DidCallStackSave = true; // Push a cleanup block and restore the stack there. // FIXME: in general circumstances, this should be an EH cleanup. pushStackRestore(NormalCleanup, Stack); } llvm::Value *elementCount; QualType elementType; llvm::tie(elementCount, elementType) = getVLASize(Ty); llvm::Type *llvmTy = ConvertTypeForMem(elementType); // Allocate memory for the array. llvm::AllocaInst *vla = Builder.CreateAlloca(llvmTy, elementCount, "vla"); vla->setAlignment(alignment.getQuantity()); DeclPtr = vla; } llvm::Value *&DMEntry = LocalDeclMap[&D]; assert(DMEntry == 0 && "Decl already exists in localdeclmap!"); DMEntry = DeclPtr; emission.Address = DeclPtr; // Emit debug info for local var declaration. if (HaveInsertPoint()) if (CGDebugInfo *DI = getDebugInfo()) { if (CGM.getCodeGenOpts().getDebugInfo() >= CodeGenOptions::LimitedDebugInfo) { DI->setLocation(D.getLocation()); DI->EmitDeclareOfAutoVariable(&D, DeclPtr, Builder); } } if (D.hasAttr()) EmitVarAnnotations(&D, emission.Address); return emission; } /// Determines whether the given __block variable is potentially /// captured by the given expression. static bool isCapturedBy(const VarDecl &var, const Expr *e) { // Skip the most common kinds of expressions that make // hierarchy-walking expensive. e = e->IgnoreParenCasts(); if (const BlockExpr *be = dyn_cast(e)) { const BlockDecl *block = be->getBlockDecl(); for (BlockDecl::capture_const_iterator i = block->capture_begin(), e = block->capture_end(); i != e; ++i) { if (i->getVariable() == &var) return true; } // No need to walk into the subexpressions. return false; } if (const StmtExpr *SE = dyn_cast(e)) { const CompoundStmt *CS = SE->getSubStmt(); for (CompoundStmt::const_body_iterator BI = CS->body_begin(), BE = CS->body_end(); BI != BE; ++BI) if (Expr *E = dyn_cast((*BI))) { if (isCapturedBy(var, E)) return true; } else if (DeclStmt *DS = dyn_cast((*BI))) { // special case declarations for (DeclStmt::decl_iterator I = DS->decl_begin(), E = DS->decl_end(); I != E; ++I) { if (VarDecl *VD = dyn_cast((*I))) { Expr *Init = VD->getInit(); if (Init && isCapturedBy(var, Init)) return true; } } } else // FIXME. Make safe assumption assuming arbitrary statements cause capturing. // Later, provide code to poke into statements for capture analysis. return true; return false; } for (Stmt::const_child_range children = e->children(); children; ++children) if (isCapturedBy(var, cast(*children))) return true; return false; } /// \brief Determine whether the given initializer is trivial in the sense /// that it requires no code to be generated. static bool isTrivialInitializer(const Expr *Init) { if (!Init) return true; if (const CXXConstructExpr *Construct = dyn_cast(Init)) if (CXXConstructorDecl *Constructor = Construct->getConstructor()) if (Constructor->isTrivial() && Constructor->isDefaultConstructor() && !Construct->requiresZeroInitialization()) return true; return false; } void CodeGenFunction::EmitAutoVarInit(const AutoVarEmission &emission) { assert(emission.Variable && "emission was not valid!"); // If this was emitted as a global constant, we're done. if (emission.wasEmittedAsGlobal()) return; const VarDecl &D = *emission.Variable; QualType type = D.getType(); // If this local has an initializer, emit it now. const Expr *Init = D.getInit(); // If we are at an unreachable point, we don't need to emit the initializer // unless it contains a label. if (!HaveInsertPoint()) { if (!Init || !ContainsLabel(Init)) return; EnsureInsertPoint(); } // Initialize the structure of a __block variable. if (emission.IsByRef) emitByrefStructureInit(emission); if (isTrivialInitializer(Init)) return; CharUnits alignment = emission.Alignment; // Check whether this is a byref variable that's potentially // captured and moved by its own initializer. If so, we'll need to // emit the initializer first, then copy into the variable. bool capturedByInit = emission.IsByRef && isCapturedBy(D, Init); llvm::Value *Loc = capturedByInit ? emission.Address : emission.getObjectAddress(*this); llvm::Constant *constant = 0; if (emission.IsConstantAggregate || D.isConstexpr()) { assert(!capturedByInit && "constant init contains a capturing block?"); constant = CGM.EmitConstantInit(D, this); } if (!constant) { LValue lv = MakeAddrLValue(Loc, type, alignment); lv.setNonGC(true); return EmitExprAsInit(Init, &D, lv, capturedByInit); } if (!emission.IsConstantAggregate) { // For simple scalar/complex initialization, store the value directly. LValue lv = MakeAddrLValue(Loc, type, alignment); lv.setNonGC(true); return EmitStoreThroughLValue(RValue::get(constant), lv, true); } // If this is a simple aggregate initialization, we can optimize it // in various ways. bool isVolatile = type.isVolatileQualified(); llvm::Value *SizeVal = llvm::ConstantInt::get(IntPtrTy, getContext().getTypeSizeInChars(type).getQuantity()); llvm::Type *BP = Int8PtrTy; if (Loc->getType() != BP) Loc = Builder.CreateBitCast(Loc, BP); // If the initializer is all or mostly zeros, codegen with memset then do // a few stores afterward. if (shouldUseMemSetPlusStoresToInitialize(constant, CGM.getDataLayout().getTypeAllocSize(constant->getType()))) { Builder.CreateMemSet(Loc, llvm::ConstantInt::get(Int8Ty, 0), SizeVal, alignment.getQuantity(), isVolatile); // Zero and undef don't require a stores. if (!constant->isNullValue() && !isa(constant)) { Loc = Builder.CreateBitCast(Loc, constant->getType()->getPointerTo()); emitStoresForInitAfterMemset(constant, Loc, isVolatile, Builder); } } else { // Otherwise, create a temporary global with the initializer then // memcpy from the global to the alloca. std::string Name = GetStaticDeclName(*this, D, "."); llvm::GlobalVariable *GV = new llvm::GlobalVariable(CGM.getModule(), constant->getType(), true, llvm::GlobalValue::PrivateLinkage, constant, Name); GV->setAlignment(alignment.getQuantity()); GV->setUnnamedAddr(true); llvm::Value *SrcPtr = GV; if (SrcPtr->getType() != BP) SrcPtr = Builder.CreateBitCast(SrcPtr, BP); Builder.CreateMemCpy(Loc, SrcPtr, SizeVal, alignment.getQuantity(), isVolatile); } } /// Emit an expression as an initializer for a variable at the given /// location. The expression is not necessarily the normal /// initializer for the variable, and the address is not necessarily /// its normal location. /// /// \param init the initializing expression /// \param var the variable to act as if we're initializing /// \param loc the address to initialize; its type is a pointer /// to the LLVM mapping of the variable's type /// \param alignment the alignment of the address /// \param capturedByInit true if the variable is a __block variable /// whose address is potentially changed by the initializer void CodeGenFunction::EmitExprAsInit(const Expr *init, const ValueDecl *D, LValue lvalue, bool capturedByInit) { QualType type = D->getType(); if (type->isReferenceType()) { RValue rvalue = EmitReferenceBindingToExpr(init); if (capturedByInit) drillIntoBlockVariable(*this, lvalue, cast(D)); EmitStoreThroughLValue(rvalue, lvalue, true); return; } switch (getEvaluationKind(type)) { case TEK_Scalar: EmitScalarInit(init, D, lvalue, capturedByInit); return; case TEK_Complex: { ComplexPairTy complex = EmitComplexExpr(init); if (capturedByInit) drillIntoBlockVariable(*this, lvalue, cast(D)); EmitStoreOfComplex(complex, lvalue, /*init*/ true); return; } case TEK_Aggregate: if (type->isAtomicType()) { EmitAtomicInit(const_cast(init), lvalue); } else { // TODO: how can we delay here if D is captured by its initializer? EmitAggExpr(init, AggValueSlot::forLValue(lvalue, AggValueSlot::IsDestructed, AggValueSlot::DoesNotNeedGCBarriers, AggValueSlot::IsNotAliased)); } return; } llvm_unreachable("bad evaluation kind"); } /// Enter a destroy cleanup for the given local variable. void CodeGenFunction::emitAutoVarTypeCleanup( const CodeGenFunction::AutoVarEmission &emission, QualType::DestructionKind dtorKind) { assert(dtorKind != QualType::DK_none); // Note that for __block variables, we want to destroy the // original stack object, not the possibly forwarded object. llvm::Value *addr = emission.getObjectAddress(*this); const VarDecl *var = emission.Variable; QualType type = var->getType(); CleanupKind cleanupKind = NormalAndEHCleanup; CodeGenFunction::Destroyer *destroyer = 0; switch (dtorKind) { case QualType::DK_none: llvm_unreachable("no cleanup for trivially-destructible variable"); case QualType::DK_cxx_destructor: // If there's an NRVO flag on the emission, we need a different // cleanup. if (emission.NRVOFlag) { assert(!type->isArrayType()); CXXDestructorDecl *dtor = type->getAsCXXRecordDecl()->getDestructor(); EHStack.pushCleanup(cleanupKind, addr, dtor, emission.NRVOFlag); return; } break; case QualType::DK_objc_strong_lifetime: // Suppress cleanups for pseudo-strong variables. if (var->isARCPseudoStrong()) return; // Otherwise, consider whether to use an EH cleanup or not. cleanupKind = getARCCleanupKind(); // Use the imprecise destroyer by default. if (!var->hasAttr()) destroyer = CodeGenFunction::destroyARCStrongImprecise; break; case QualType::DK_objc_weak_lifetime: break; } // If we haven't chosen a more specific destroyer, use the default. if (!destroyer) destroyer = getDestroyer(dtorKind); // Use an EH cleanup in array destructors iff the destructor itself // is being pushed as an EH cleanup. bool useEHCleanup = (cleanupKind & EHCleanup); EHStack.pushCleanup(cleanupKind, addr, type, destroyer, useEHCleanup); } void CodeGenFunction::EmitAutoVarCleanups(const AutoVarEmission &emission) { assert(emission.Variable && "emission was not valid!"); // If this was emitted as a global constant, we're done. if (emission.wasEmittedAsGlobal()) return; // If we don't have an insertion point, we're done. Sema prevents // us from jumping into any of these scopes anyway. if (!HaveInsertPoint()) return; const VarDecl &D = *emission.Variable; // Make sure we call @@llvm.lifetime.end. This needs to happen // *last*, so the cleanup needs to be pushed *first*. if (emission.useLifetimeMarkers()) { EHStack.pushCleanup(NormalCleanup, emission.getAllocatedAddress(), emission.getSizeForLifetimeMarkers()); } // Check the type for a cleanup. if (QualType::DestructionKind dtorKind = D.getType().isDestructedType()) emitAutoVarTypeCleanup(emission, dtorKind); // In GC mode, honor objc_precise_lifetime. if (getLangOpts().getGC() != LangOptions::NonGC && D.hasAttr()) { EHStack.pushCleanup(NormalCleanup, &D); } // Handle the cleanup attribute. if (const CleanupAttr *CA = D.getAttr()) { const FunctionDecl *FD = CA->getFunctionDecl(); llvm::Constant *F = CGM.GetAddrOfFunction(FD); assert(F && "Could not find function!"); const CGFunctionInfo &Info = CGM.getTypes().arrangeFunctionDeclaration(FD); EHStack.pushCleanup(NormalAndEHCleanup, F, &Info, &D); } // If this is a block variable, call _Block_object_destroy // (on the unforwarded address). if (emission.IsByRef) enterByrefCleanup(emission); } CodeGenFunction::Destroyer * CodeGenFunction::getDestroyer(QualType::DestructionKind kind) { switch (kind) { case QualType::DK_none: llvm_unreachable("no destroyer for trivial dtor"); case QualType::DK_cxx_destructor: return destroyCXXObject; case QualType::DK_objc_strong_lifetime: return destroyARCStrongPrecise; case QualType::DK_objc_weak_lifetime: return destroyARCWeak; } llvm_unreachable("Unknown DestructionKind"); } /// pushEHDestroy - Push the standard destructor for the given type as /// an EH-only cleanup. void CodeGenFunction::pushEHDestroy(QualType::DestructionKind dtorKind, llvm::Value *addr, QualType type) { assert(dtorKind && "cannot push destructor for trivial type"); assert(needsEHCleanup(dtorKind)); pushDestroy(EHCleanup, addr, type, getDestroyer(dtorKind), true); } /// pushDestroy - Push the standard destructor for the given type as /// at least a normal cleanup. void CodeGenFunction::pushDestroy(QualType::DestructionKind dtorKind, llvm::Value *addr, QualType type) { assert(dtorKind && "cannot push destructor for trivial type"); CleanupKind cleanupKind = getCleanupKind(dtorKind); pushDestroy(cleanupKind, addr, type, getDestroyer(dtorKind), cleanupKind & EHCleanup); } void CodeGenFunction::pushDestroy(CleanupKind cleanupKind, llvm::Value *addr, QualType type, Destroyer *destroyer, bool useEHCleanupForArray) { pushFullExprCleanup(cleanupKind, addr, type, destroyer, useEHCleanupForArray); } void CodeGenFunction::pushStackRestore(CleanupKind Kind, llvm::Value *SPMem) { EHStack.pushCleanup(Kind, SPMem); } void CodeGenFunction::pushLifetimeExtendedDestroy( CleanupKind cleanupKind, llvm::Value *addr, QualType type, Destroyer *destroyer, bool useEHCleanupForArray) { assert(!isInConditionalBranch() && "performing lifetime extension from within conditional"); // Push an EH-only cleanup for the object now. // FIXME: When popping normal cleanups, we need to keep this EH cleanup // around in case a temporary's destructor throws an exception. if (cleanupKind & EHCleanup) EHStack.pushCleanup( static_cast(cleanupKind & ~NormalCleanup), addr, type, destroyer, useEHCleanupForArray); // Remember that we need to push a full cleanup for the object at the // end of the full-expression. pushCleanupAfterFullExpr( cleanupKind, addr, type, destroyer, useEHCleanupForArray); } /// emitDestroy - Immediately perform the destruction of the given /// object. /// /// \param addr - the address of the object; a type* /// \param type - the type of the object; if an array type, all /// objects are destroyed in reverse order /// \param destroyer - the function to call to destroy individual /// elements /// \param useEHCleanupForArray - whether an EH cleanup should be /// used when destroying array elements, in case one of the /// destructions throws an exception void CodeGenFunction::emitDestroy(llvm::Value *addr, QualType type, Destroyer *destroyer, bool useEHCleanupForArray) { const ArrayType *arrayType = getContext().getAsArrayType(type); if (!arrayType) return destroyer(*this, addr, type); llvm::Value *begin = addr; llvm::Value *length = emitArrayLength(arrayType, type, begin); // Normally we have to check whether the array is zero-length. bool checkZeroLength = true; // But if the array length is constant, we can suppress that. if (llvm::ConstantInt *constLength = dyn_cast(length)) { // ...and if it's constant zero, we can just skip the entire thing. if (constLength->isZero()) return; checkZeroLength = false; } llvm::Value *end = Builder.CreateInBoundsGEP(begin, length); emitArrayDestroy(begin, end, type, destroyer, checkZeroLength, useEHCleanupForArray); } /// emitArrayDestroy - Destroys all the elements of the given array, /// beginning from last to first. The array cannot be zero-length. /// /// \param begin - a type* denoting the first element of the array /// \param end - a type* denoting one past the end of the array /// \param type - the element type of the array /// \param destroyer - the function to call to destroy elements /// \param useEHCleanup - whether to push an EH cleanup to destroy /// the remaining elements in case the destruction of a single /// element throws void CodeGenFunction::emitArrayDestroy(llvm::Value *begin, llvm::Value *end, QualType type, Destroyer *destroyer, bool checkZeroLength, bool useEHCleanup) { assert(!type->isArrayType()); // The basic structure here is a do-while loop, because we don't // need to check for the zero-element case. llvm::BasicBlock *bodyBB = createBasicBlock("arraydestroy.body"); llvm::BasicBlock *doneBB = createBasicBlock("arraydestroy.done"); if (checkZeroLength) { llvm::Value *isEmpty = Builder.CreateICmpEQ(begin, end, "arraydestroy.isempty"); Builder.CreateCondBr(isEmpty, doneBB, bodyBB); } // Enter the loop body, making that address the current address. llvm::BasicBlock *entryBB = Builder.GetInsertBlock(); EmitBlock(bodyBB); llvm::PHINode *elementPast = Builder.CreatePHI(begin->getType(), 2, "arraydestroy.elementPast"); elementPast->addIncoming(end, entryBB); // Shift the address back by one element. llvm::Value *negativeOne = llvm::ConstantInt::get(SizeTy, -1, true); llvm::Value *element = Builder.CreateInBoundsGEP(elementPast, negativeOne, "arraydestroy.element"); if (useEHCleanup) pushRegularPartialArrayCleanup(begin, element, type, destroyer); // Perform the actual destruction there. destroyer(*this, element, type); if (useEHCleanup) PopCleanupBlock(); // Check whether we've reached the end. llvm::Value *done = Builder.CreateICmpEQ(element, begin, "arraydestroy.done"); Builder.CreateCondBr(done, doneBB, bodyBB); elementPast->addIncoming(element, Builder.GetInsertBlock()); // Done. EmitBlock(doneBB); } /// Perform partial array destruction as if in an EH cleanup. Unlike /// emitArrayDestroy, the element type here may still be an array type. static void emitPartialArrayDestroy(CodeGenFunction &CGF, llvm::Value *begin, llvm::Value *end, QualType type, CodeGenFunction::Destroyer *destroyer) { // If the element type is itself an array, drill down. unsigned arrayDepth = 0; while (const ArrayType *arrayType = CGF.getContext().getAsArrayType(type)) { // VLAs don't require a GEP index to walk into. if (!isa(arrayType)) arrayDepth++; type = arrayType->getElementType(); } if (arrayDepth) { llvm::Value *zero = llvm::ConstantInt::get(CGF.SizeTy, arrayDepth+1); SmallVector gepIndices(arrayDepth, zero); begin = CGF.Builder.CreateInBoundsGEP(begin, gepIndices, "pad.arraybegin"); end = CGF.Builder.CreateInBoundsGEP(end, gepIndices, "pad.arrayend"); } // Destroy the array. We don't ever need an EH cleanup because we // assume that we're in an EH cleanup ourselves, so a throwing // destructor causes an immediate terminate. CGF.emitArrayDestroy(begin, end, type, destroyer, /*checkZeroLength*/ true, /*useEHCleanup*/ false); } namespace { /// RegularPartialArrayDestroy - a cleanup which performs a partial /// array destroy where the end pointer is regularly determined and /// does not need to be loaded from a local. class RegularPartialArrayDestroy : public EHScopeStack::Cleanup { llvm::Value *ArrayBegin; llvm::Value *ArrayEnd; QualType ElementType; CodeGenFunction::Destroyer *Destroyer; public: RegularPartialArrayDestroy(llvm::Value *arrayBegin, llvm::Value *arrayEnd, QualType elementType, CodeGenFunction::Destroyer *destroyer) : ArrayBegin(arrayBegin), ArrayEnd(arrayEnd), ElementType(elementType), Destroyer(destroyer) {} void Emit(CodeGenFunction &CGF, Flags flags) { emitPartialArrayDestroy(CGF, ArrayBegin, ArrayEnd, ElementType, Destroyer); } }; /// IrregularPartialArrayDestroy - a cleanup which performs a /// partial array destroy where the end pointer is irregularly /// determined and must be loaded from a local. class IrregularPartialArrayDestroy : public EHScopeStack::Cleanup { llvm::Value *ArrayBegin; llvm::Value *ArrayEndPointer; QualType ElementType; CodeGenFunction::Destroyer *Destroyer; public: IrregularPartialArrayDestroy(llvm::Value *arrayBegin, llvm::Value *arrayEndPointer, QualType elementType, CodeGenFunction::Destroyer *destroyer) : ArrayBegin(arrayBegin), ArrayEndPointer(arrayEndPointer), ElementType(elementType), Destroyer(destroyer) {} void Emit(CodeGenFunction &CGF, Flags flags) { llvm::Value *arrayEnd = CGF.Builder.CreateLoad(ArrayEndPointer); emitPartialArrayDestroy(CGF, ArrayBegin, arrayEnd, ElementType, Destroyer); } }; } /// pushIrregularPartialArrayCleanup - Push an EH cleanup to destroy /// already-constructed elements of the given array. The cleanup /// may be popped with DeactivateCleanupBlock or PopCleanupBlock. /// /// \param elementType - the immediate element type of the array; /// possibly still an array type void CodeGenFunction::pushIrregularPartialArrayCleanup(llvm::Value *arrayBegin, llvm::Value *arrayEndPointer, QualType elementType, Destroyer *destroyer) { pushFullExprCleanup(EHCleanup, arrayBegin, arrayEndPointer, elementType, destroyer); } /// pushRegularPartialArrayCleanup - Push an EH cleanup to destroy /// already-constructed elements of the given array. The cleanup /// may be popped with DeactivateCleanupBlock or PopCleanupBlock. /// /// \param elementType - the immediate element type of the array; /// possibly still an array type void CodeGenFunction::pushRegularPartialArrayCleanup(llvm::Value *arrayBegin, llvm::Value *arrayEnd, QualType elementType, Destroyer *destroyer) { pushFullExprCleanup(EHCleanup, arrayBegin, arrayEnd, elementType, destroyer); } /// Lazily declare the @@llvm.lifetime.start intrinsic. llvm::Constant *CodeGenModule::getLLVMLifetimeStartFn() { if (LifetimeStartFn) return LifetimeStartFn; LifetimeStartFn = llvm::Intrinsic::getDeclaration(&getModule(), llvm::Intrinsic::lifetime_start); return LifetimeStartFn; } /// Lazily declare the @@llvm.lifetime.end intrinsic. llvm::Constant *CodeGenModule::getLLVMLifetimeEndFn() { if (LifetimeEndFn) return LifetimeEndFn; LifetimeEndFn = llvm::Intrinsic::getDeclaration(&getModule(), llvm::Intrinsic::lifetime_end); return LifetimeEndFn; } namespace { /// A cleanup to perform a release of an object at the end of a /// function. This is used to balance out the incoming +1 of a /// ns_consumed argument when we can't reasonably do that just by /// not doing the initial retain for a __block argument. struct ConsumeARCParameter : EHScopeStack::Cleanup { ConsumeARCParameter(llvm::Value *param, ARCPreciseLifetime_t precise) : Param(param), Precise(precise) {} llvm::Value *Param; ARCPreciseLifetime_t Precise; void Emit(CodeGenFunction &CGF, Flags flags) { CGF.EmitARCRelease(Param, Precise); } }; } /// Emit an alloca (or GlobalValue depending on target) /// for the specified parameter and set up LocalDeclMap. void CodeGenFunction::EmitParmDecl(const VarDecl &D, llvm::Value *Arg, bool ArgIsPointer, unsigned ArgNo) { // FIXME: Why isn't ImplicitParamDecl a ParmVarDecl? assert((isa(D) || isa(D)) && "Invalid argument to EmitParmDecl"); Arg->setName(D.getName()); QualType Ty = D.getType(); // Use better IR generation for certain implicit parameters. if (isa(D)) { // The only implicit argument a block has is its literal. if (BlockInfo) { LocalDeclMap[&D] = Arg; llvm::Value *LocalAddr = 0; if (CGM.getCodeGenOpts().OptimizationLevel == 0) { // Allocate a stack slot to let the debug info survive the RA. llvm::AllocaInst *Alloc = CreateTempAlloca(ConvertTypeForMem(Ty), D.getName() + ".addr"); Alloc->setAlignment(getContext().getDeclAlign(&D).getQuantity()); LValue lv = MakeAddrLValue(Alloc, Ty, getContext().getDeclAlign(&D)); EmitStoreOfScalar(Arg, lv, /* isInitialization */ true); LocalAddr = Builder.CreateLoad(Alloc); } if (CGDebugInfo *DI = getDebugInfo()) { if (CGM.getCodeGenOpts().getDebugInfo() >= CodeGenOptions::LimitedDebugInfo) { DI->setLocation(D.getLocation()); DI->EmitDeclareOfBlockLiteralArgVariable(*BlockInfo, Arg, LocalAddr, Builder); } } return; } } llvm::Value *DeclPtr; bool DoStore = false; bool IsScalar = hasScalarEvaluationKind(Ty); CharUnits Align = getContext().getDeclAlign(&D); // If we already have a pointer to the argument, reuse the input pointer. if (ArgIsPointer) { assert(isa(Arg->getType())); DeclPtr = Arg; // Push a destructor cleanup for this parameter if the ABI requires it. if (!IsScalar && getTarget().getCXXABI().areArgsDestroyedLeftToRightInCallee()) { const CXXRecordDecl *RD = Ty->getAsCXXRecordDecl(); if (RD && RD->hasNonTrivialDestructor()) pushDestroy(QualType::DK_cxx_destructor, DeclPtr, Ty); } } else { // Otherwise, create a temporary to hold the value. llvm::AllocaInst *Alloc = CreateTempAlloca(ConvertTypeForMem(Ty), D.getName() + ".addr"); Alloc->setAlignment(Align.getQuantity()); DeclPtr = Alloc; DoStore = true; } LValue lv = MakeAddrLValue(DeclPtr, Ty, Align); if (IsScalar) { Qualifiers qs = Ty.getQualifiers(); if (Qualifiers::ObjCLifetime lt = qs.getObjCLifetime()) { // We honor __attribute__((ns_consumed)) for types with lifetime. // For __strong, it's handled by just skipping the initial retain; // otherwise we have to balance out the initial +1 with an extra // cleanup to do the release at the end of the function. bool isConsumed = D.hasAttr(); // 'self' is always formally __strong, but if this is not an // init method then we don't want to retain it. if (D.isARCPseudoStrong()) { const ObjCMethodDecl *method = cast(CurCodeDecl); assert(&D == method->getSelfDecl()); assert(lt == Qualifiers::OCL_Strong); assert(qs.hasConst()); assert(method->getMethodFamily() != OMF_init); (void) method; lt = Qualifiers::OCL_ExplicitNone; } if (lt == Qualifiers::OCL_Strong) { if (!isConsumed) { if (CGM.getCodeGenOpts().OptimizationLevel == 0) { // use objc_storeStrong(&dest, value) for retaining the // object. But first, store a null into 'dest' because // objc_storeStrong attempts to release its old value. llvm::Value *Null = CGM.EmitNullConstant(D.getType()); EmitStoreOfScalar(Null, lv, /* isInitialization */ true); EmitARCStoreStrongCall(lv.getAddress(), Arg, true); DoStore = false; } else // Don't use objc_retainBlock for block pointers, because we // don't want to Block_copy something just because we got it // as a parameter. Arg = EmitARCRetainNonBlock(Arg); } } else { // Push the cleanup for a consumed parameter. if (isConsumed) { ARCPreciseLifetime_t precise = (D.hasAttr() ? ARCPreciseLifetime : ARCImpreciseLifetime); EHStack.pushCleanup(getARCCleanupKind(), Arg, precise); } if (lt == Qualifiers::OCL_Weak) { EmitARCInitWeak(DeclPtr, Arg); DoStore = false; // The weak init is a store, no need to do two. } } // Enter the cleanup scope. EmitAutoVarWithLifetime(*this, D, DeclPtr, lt); } } // Store the initial value into the alloca. if (DoStore) EmitStoreOfScalar(Arg, lv, /* isInitialization */ true); llvm::Value *&DMEntry = LocalDeclMap[&D]; assert(DMEntry == 0 && "Decl already exists in localdeclmap!"); DMEntry = DeclPtr; // Emit debug info for param declaration. if (CGDebugInfo *DI = getDebugInfo()) { if (CGM.getCodeGenOpts().getDebugInfo() >= CodeGenOptions::LimitedDebugInfo) { DI->EmitDeclareOfArgVariable(&D, DeclPtr, ArgNo, Builder); } } if (D.hasAttr()) EmitVarAnnotations(&D, DeclPtr); } @