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2609 lines
100 KiB
2609 lines
100 KiB
//===--- CGDecl.cpp - Emit LLVM Code for declarations ---------------------===//
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//
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// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
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// See https://llvm.org/LICENSE.txt for license information.
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// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
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//
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//===----------------------------------------------------------------------===//
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//
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// This contains code to emit Decl nodes as LLVM code.
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//
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//===----------------------------------------------------------------------===//
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#include "CGBlocks.h"
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#include "CGCXXABI.h"
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#include "CGCleanup.h"
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#include "CGDebugInfo.h"
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#include "CGOpenCLRuntime.h"
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#include "CGOpenMPRuntime.h"
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#include "CodeGenFunction.h"
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#include "CodeGenModule.h"
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#include "ConstantEmitter.h"
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#include "PatternInit.h"
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#include "TargetInfo.h"
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#include "clang/AST/ASTContext.h"
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#include "clang/AST/Attr.h"
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#include "clang/AST/CharUnits.h"
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#include "clang/AST/Decl.h"
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#include "clang/AST/DeclObjC.h"
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#include "clang/AST/DeclOpenMP.h"
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#include "clang/Basic/CodeGenOptions.h"
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#include "clang/Basic/SourceManager.h"
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#include "clang/Basic/TargetInfo.h"
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#include "clang/CodeGen/CGFunctionInfo.h"
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#include "clang/Sema/Sema.h"
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#include "llvm/Analysis/ValueTracking.h"
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#include "llvm/IR/DataLayout.h"
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#include "llvm/IR/GlobalVariable.h"
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#include "llvm/IR/Intrinsics.h"
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#include "llvm/IR/Type.h"
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using namespace clang;
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using namespace CodeGen;
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static_assert(clang::Sema::MaximumAlignment <= llvm::Value::MaximumAlignment,
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"Clang max alignment greater than what LLVM supports?");
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void CodeGenFunction::EmitDecl(const Decl &D) {
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switch (D.getKind()) {
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case Decl::BuiltinTemplate:
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case Decl::TranslationUnit:
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case Decl::ExternCContext:
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case Decl::Namespace:
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case Decl::UnresolvedUsingTypename:
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case Decl::ClassTemplateSpecialization:
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case Decl::ClassTemplatePartialSpecialization:
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case Decl::VarTemplateSpecialization:
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case Decl::VarTemplatePartialSpecialization:
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case Decl::TemplateTypeParm:
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case Decl::UnresolvedUsingValue:
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case Decl::NonTypeTemplateParm:
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case Decl::CXXDeductionGuide:
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case Decl::CXXMethod:
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case Decl::CXXConstructor:
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case Decl::CXXDestructor:
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case Decl::CXXConversion:
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case Decl::Field:
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case Decl::MSProperty:
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case Decl::IndirectField:
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case Decl::ObjCIvar:
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case Decl::ObjCAtDefsField:
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case Decl::ParmVar:
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case Decl::ImplicitParam:
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case Decl::ClassTemplate:
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case Decl::VarTemplate:
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case Decl::FunctionTemplate:
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case Decl::TypeAliasTemplate:
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case Decl::TemplateTemplateParm:
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case Decl::ObjCMethod:
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case Decl::ObjCCategory:
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case Decl::ObjCProtocol:
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case Decl::ObjCInterface:
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case Decl::ObjCCategoryImpl:
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case Decl::ObjCImplementation:
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case Decl::ObjCProperty:
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case Decl::ObjCCompatibleAlias:
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case Decl::PragmaComment:
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case Decl::PragmaDetectMismatch:
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case Decl::AccessSpec:
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case Decl::LinkageSpec:
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case Decl::Export:
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case Decl::ObjCPropertyImpl:
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case Decl::FileScopeAsm:
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case Decl::Friend:
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case Decl::FriendTemplate:
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case Decl::Block:
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case Decl::Captured:
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case Decl::ClassScopeFunctionSpecialization:
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case Decl::UsingShadow:
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case Decl::ConstructorUsingShadow:
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case Decl::ObjCTypeParam:
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case Decl::Binding:
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llvm_unreachable("Declaration should not be in declstmts!");
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case Decl::Record: // struct/union/class X;
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case Decl::CXXRecord: // struct/union/class X; [C++]
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if (CGDebugInfo *DI = getDebugInfo())
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if (cast<RecordDecl>(D).getDefinition())
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DI->EmitAndRetainType(getContext().getRecordType(cast<RecordDecl>(&D)));
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return;
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case Decl::Enum: // enum X;
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if (CGDebugInfo *DI = getDebugInfo())
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if (cast<EnumDecl>(D).getDefinition())
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DI->EmitAndRetainType(getContext().getEnumType(cast<EnumDecl>(&D)));
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return;
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case Decl::Function: // void X();
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case Decl::EnumConstant: // enum ? { X = ? }
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case Decl::StaticAssert: // static_assert(X, ""); [C++0x]
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case Decl::Label: // __label__ x;
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case Decl::Import:
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case Decl::MSGuid: // __declspec(uuid("..."))
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case Decl::TemplateParamObject:
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case Decl::OMPThreadPrivate:
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case Decl::OMPAllocate:
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case Decl::OMPCapturedExpr:
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case Decl::OMPRequires:
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case Decl::Empty:
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case Decl::Concept:
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case Decl::LifetimeExtendedTemporary:
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case Decl::RequiresExprBody:
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// None of these decls require codegen support.
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return;
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case Decl::NamespaceAlias:
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if (CGDebugInfo *DI = getDebugInfo())
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DI->EmitNamespaceAlias(cast<NamespaceAliasDecl>(D));
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return;
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case Decl::Using: // using X; [C++]
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if (CGDebugInfo *DI = getDebugInfo())
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DI->EmitUsingDecl(cast<UsingDecl>(D));
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return;
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case Decl::UsingPack:
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for (auto *Using : cast<UsingPackDecl>(D).expansions())
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EmitDecl(*Using);
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return;
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case Decl::UsingDirective: // using namespace X; [C++]
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if (CGDebugInfo *DI = getDebugInfo())
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DI->EmitUsingDirective(cast<UsingDirectiveDecl>(D));
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return;
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case Decl::Var:
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case Decl::Decomposition: {
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const VarDecl &VD = cast<VarDecl>(D);
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assert(VD.isLocalVarDecl() &&
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"Should not see file-scope variables inside a function!");
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EmitVarDecl(VD);
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if (auto *DD = dyn_cast<DecompositionDecl>(&VD))
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for (auto *B : DD->bindings())
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if (auto *HD = B->getHoldingVar())
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EmitVarDecl(*HD);
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return;
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}
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case Decl::OMPDeclareReduction:
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return CGM.EmitOMPDeclareReduction(cast<OMPDeclareReductionDecl>(&D), this);
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case Decl::OMPDeclareMapper:
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return CGM.EmitOMPDeclareMapper(cast<OMPDeclareMapperDecl>(&D), this);
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case Decl::Typedef: // typedef int X;
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case Decl::TypeAlias: { // using X = int; [C++0x]
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QualType Ty = cast<TypedefNameDecl>(D).getUnderlyingType();
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if (CGDebugInfo *DI = getDebugInfo())
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DI->EmitAndRetainType(Ty);
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if (Ty->isVariablyModifiedType())
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EmitVariablyModifiedType(Ty);
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return;
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}
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}
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}
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/// EmitVarDecl - This method handles emission of any variable declaration
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/// inside a function, including static vars etc.
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void CodeGenFunction::EmitVarDecl(const VarDecl &D) {
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if (D.hasExternalStorage())
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// Don't emit it now, allow it to be emitted lazily on its first use.
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return;
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// Some function-scope variable does not have static storage but still
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// needs to be emitted like a static variable, e.g. a function-scope
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// variable in constant address space in OpenCL.
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if (D.getStorageDuration() != SD_Automatic) {
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// Static sampler variables translated to function calls.
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if (D.getType()->isSamplerT())
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return;
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llvm::GlobalValue::LinkageTypes Linkage =
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CGM.getLLVMLinkageVarDefinition(&D, /*IsConstant=*/false);
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// FIXME: We need to force the emission/use of a guard variable for
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// some variables even if we can constant-evaluate them because
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// we can't guarantee every translation unit will constant-evaluate them.
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return EmitStaticVarDecl(D, Linkage);
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}
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if (D.getType().getAddressSpace() == LangAS::opencl_local)
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return CGM.getOpenCLRuntime().EmitWorkGroupLocalVarDecl(*this, D);
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assert(D.hasLocalStorage());
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return EmitAutoVarDecl(D);
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}
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static std::string getStaticDeclName(CodeGenModule &CGM, const VarDecl &D) {
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if (CGM.getLangOpts().CPlusPlus)
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return CGM.getMangledName(&D).str();
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// If this isn't C++, we don't need a mangled name, just a pretty one.
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assert(!D.isExternallyVisible() && "name shouldn't matter");
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std::string ContextName;
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const DeclContext *DC = D.getDeclContext();
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if (auto *CD = dyn_cast<CapturedDecl>(DC))
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DC = cast<DeclContext>(CD->getNonClosureContext());
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if (const auto *FD = dyn_cast<FunctionDecl>(DC))
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ContextName = std::string(CGM.getMangledName(FD));
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else if (const auto *BD = dyn_cast<BlockDecl>(DC))
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ContextName = std::string(CGM.getBlockMangledName(GlobalDecl(), BD));
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else if (const auto *OMD = dyn_cast<ObjCMethodDecl>(DC))
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ContextName = OMD->getSelector().getAsString();
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else
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llvm_unreachable("Unknown context for static var decl");
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ContextName += "." + D.getNameAsString();
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return ContextName;
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}
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llvm::Constant *CodeGenModule::getOrCreateStaticVarDecl(
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const VarDecl &D, llvm::GlobalValue::LinkageTypes Linkage) {
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// In general, we don't always emit static var decls once before we reference
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// them. It is possible to reference them before emitting the function that
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// contains them, and it is possible to emit the containing function multiple
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// times.
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if (llvm::Constant *ExistingGV = StaticLocalDeclMap[&D])
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return ExistingGV;
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QualType Ty = D.getType();
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assert(Ty->isConstantSizeType() && "VLAs can't be static");
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// Use the label if the variable is renamed with the asm-label extension.
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std::string Name;
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if (D.hasAttr<AsmLabelAttr>())
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Name = std::string(getMangledName(&D));
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else
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Name = getStaticDeclName(*this, D);
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llvm::Type *LTy = getTypes().ConvertTypeForMem(Ty);
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LangAS AS = GetGlobalVarAddressSpace(&D);
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unsigned TargetAS = getContext().getTargetAddressSpace(AS);
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// OpenCL variables in local address space and CUDA shared
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// variables cannot have an initializer.
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llvm::Constant *Init = nullptr;
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if (Ty.getAddressSpace() == LangAS::opencl_local ||
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D.hasAttr<CUDASharedAttr>() || D.hasAttr<LoaderUninitializedAttr>())
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Init = llvm::UndefValue::get(LTy);
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else
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Init = EmitNullConstant(Ty);
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llvm::GlobalVariable *GV = new llvm::GlobalVariable(
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getModule(), LTy, Ty.isConstant(getContext()), Linkage, Init, Name,
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nullptr, llvm::GlobalVariable::NotThreadLocal, TargetAS);
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GV->setAlignment(getContext().getDeclAlign(&D).getAsAlign());
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if (supportsCOMDAT() && GV->isWeakForLinker())
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GV->setComdat(TheModule.getOrInsertComdat(GV->getName()));
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if (D.getTLSKind())
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setTLSMode(GV, D);
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setGVProperties(GV, &D);
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// Make sure the result is of the correct type.
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LangAS ExpectedAS = Ty.getAddressSpace();
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llvm::Constant *Addr = GV;
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if (AS != ExpectedAS) {
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Addr = getTargetCodeGenInfo().performAddrSpaceCast(
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*this, GV, AS, ExpectedAS,
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LTy->getPointerTo(getContext().getTargetAddressSpace(ExpectedAS)));
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}
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setStaticLocalDeclAddress(&D, Addr);
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// Ensure that the static local gets initialized by making sure the parent
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// function gets emitted eventually.
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const Decl *DC = cast<Decl>(D.getDeclContext());
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// We can't name blocks or captured statements directly, so try to emit their
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// parents.
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if (isa<BlockDecl>(DC) || isa<CapturedDecl>(DC)) {
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DC = DC->getNonClosureContext();
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// FIXME: Ensure that global blocks get emitted.
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if (!DC)
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return Addr;
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}
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GlobalDecl GD;
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if (const auto *CD = dyn_cast<CXXConstructorDecl>(DC))
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GD = GlobalDecl(CD, Ctor_Base);
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else if (const auto *DD = dyn_cast<CXXDestructorDecl>(DC))
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GD = GlobalDecl(DD, Dtor_Base);
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else if (const auto *FD = dyn_cast<FunctionDecl>(DC))
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GD = GlobalDecl(FD);
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else {
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// Don't do anything for Obj-C method decls or global closures. We should
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// never defer them.
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assert(isa<ObjCMethodDecl>(DC) && "unexpected parent code decl");
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}
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if (GD.getDecl()) {
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// Disable emission of the parent function for the OpenMP device codegen.
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CGOpenMPRuntime::DisableAutoDeclareTargetRAII NoDeclTarget(*this);
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(void)GetAddrOfGlobal(GD);
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}
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return Addr;
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}
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/// AddInitializerToStaticVarDecl - Add the initializer for 'D' to the
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/// global variable that has already been created for it. If the initializer
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/// has a different type than GV does, this may free GV and return a different
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/// one. Otherwise it just returns GV.
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llvm::GlobalVariable *
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CodeGenFunction::AddInitializerToStaticVarDecl(const VarDecl &D,
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llvm::GlobalVariable *GV) {
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ConstantEmitter emitter(*this);
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llvm::Constant *Init = emitter.tryEmitForInitializer(D);
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// If constant emission failed, then this should be a C++ static
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// initializer.
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if (!Init) {
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if (!getLangOpts().CPlusPlus)
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CGM.ErrorUnsupported(D.getInit(), "constant l-value expression");
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else if (HaveInsertPoint()) {
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// Since we have a static initializer, this global variable can't
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// be constant.
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GV->setConstant(false);
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EmitCXXGuardedInit(D, GV, /*PerformInit*/true);
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}
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return GV;
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}
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// The initializer may differ in type from the global. Rewrite
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// the global to match the initializer. (We have to do this
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// because some types, like unions, can't be completely represented
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// in the LLVM type system.)
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if (GV->getValueType() != Init->getType()) {
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llvm::GlobalVariable *OldGV = GV;
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GV = new llvm::GlobalVariable(CGM.getModule(), Init->getType(),
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OldGV->isConstant(),
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OldGV->getLinkage(), Init, "",
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/*InsertBefore*/ OldGV,
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OldGV->getThreadLocalMode(),
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CGM.getContext().getTargetAddressSpace(D.getType()));
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GV->setVisibility(OldGV->getVisibility());
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GV->setDSOLocal(OldGV->isDSOLocal());
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GV->setComdat(OldGV->getComdat());
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// Steal the name of the old global
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GV->takeName(OldGV);
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// Replace all uses of the old global with the new global
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llvm::Constant *NewPtrForOldDecl =
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llvm::ConstantExpr::getBitCast(GV, OldGV->getType());
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OldGV->replaceAllUsesWith(NewPtrForOldDecl);
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// Erase the old global, since it is no longer used.
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OldGV->eraseFromParent();
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}
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GV->setConstant(CGM.isTypeConstant(D.getType(), true));
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GV->setInitializer(Init);
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emitter.finalize(GV);
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if (D.needsDestruction(getContext()) == QualType::DK_cxx_destructor &&
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HaveInsertPoint()) {
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// We have a constant initializer, but a nontrivial destructor. We still
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// need to perform a guarded "initialization" in order to register the
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// destructor.
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EmitCXXGuardedInit(D, GV, /*PerformInit*/false);
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}
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return GV;
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}
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void CodeGenFunction::EmitStaticVarDecl(const VarDecl &D,
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llvm::GlobalValue::LinkageTypes Linkage) {
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// Check to see if we already have a global variable for this
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// declaration. This can happen when double-emitting function
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// bodies, e.g. with complete and base constructors.
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llvm::Constant *addr = CGM.getOrCreateStaticVarDecl(D, Linkage);
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CharUnits alignment = getContext().getDeclAlign(&D);
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// Store into LocalDeclMap before generating initializer to handle
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// circular references.
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setAddrOfLocalVar(&D, Address(addr, alignment));
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// We can't have a VLA here, but we can have a pointer to a VLA,
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// even though that doesn't really make any sense.
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// Make sure to evaluate VLA bounds now so that we have them for later.
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if (D.getType()->isVariablyModifiedType())
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EmitVariablyModifiedType(D.getType());
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// Save the type in case adding the initializer forces a type change.
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llvm::Type *expectedType = addr->getType();
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llvm::GlobalVariable *var =
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cast<llvm::GlobalVariable>(addr->stripPointerCasts());
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// CUDA's local and local static __shared__ variables should not
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// have any non-empty initializers. This is ensured by Sema.
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// Whatever initializer such variable may have when it gets here is
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// a no-op and should not be emitted.
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bool isCudaSharedVar = getLangOpts().CUDA && getLangOpts().CUDAIsDevice &&
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D.hasAttr<CUDASharedAttr>();
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// If this value has an initializer, emit it.
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if (D.getInit() && !isCudaSharedVar)
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var = AddInitializerToStaticVarDecl(D, var);
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var->setAlignment(alignment.getAsAlign());
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if (D.hasAttr<AnnotateAttr>())
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CGM.AddGlobalAnnotations(&D, var);
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if (auto *SA = D.getAttr<PragmaClangBSSSectionAttr>())
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var->addAttribute("bss-section", SA->getName());
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if (auto *SA = D.getAttr<PragmaClangDataSectionAttr>())
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var->addAttribute("data-section", SA->getName());
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if (auto *SA = D.getAttr<PragmaClangRodataSectionAttr>())
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var->addAttribute("rodata-section", SA->getName());
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if (auto *SA = D.getAttr<PragmaClangRelroSectionAttr>())
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var->addAttribute("relro-section", SA->getName());
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if (const SectionAttr *SA = D.getAttr<SectionAttr>())
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var->setSection(SA->getName());
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if (D.hasAttr<UsedAttr>())
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CGM.addUsedGlobal(var);
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// We may have to cast the constant because of the initializer
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// mismatch above.
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//
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// FIXME: It is really dangerous to store this in the map; if anyone
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// RAUW's the GV uses of this constant will be invalid.
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llvm::Constant *castedAddr =
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llvm::ConstantExpr::getPointerBitCastOrAddrSpaceCast(var, expectedType);
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if (var != castedAddr)
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LocalDeclMap.find(&D)->second = Address(castedAddr, alignment);
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CGM.setStaticLocalDeclAddress(&D, castedAddr);
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CGM.getSanitizerMetadata()->reportGlobalToASan(var, D);
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// Emit global variable debug descriptor for static vars.
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CGDebugInfo *DI = getDebugInfo();
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if (DI && CGM.getCodeGenOpts().hasReducedDebugInfo()) {
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DI->setLocation(D.getLocation());
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DI->EmitGlobalVariable(var, &D);
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}
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}
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namespace {
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struct DestroyObject final : EHScopeStack::Cleanup {
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DestroyObject(Address addr, QualType type,
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|
CodeGenFunction::Destroyer *destroyer,
|
|
bool useEHCleanupForArray)
|
|
: addr(addr), type(type), destroyer(destroyer),
|
|
useEHCleanupForArray(useEHCleanupForArray) {}
|
|
|
|
Address 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);
|
|
}
|
|
};
|
|
|
|
template <class Derived>
|
|
struct DestroyNRVOVariable : EHScopeStack::Cleanup {
|
|
DestroyNRVOVariable(Address addr, QualType type, llvm::Value *NRVOFlag)
|
|
: NRVOFlag(NRVOFlag), Loc(addr), Ty(type) {}
|
|
|
|
llvm::Value *NRVOFlag;
|
|
Address Loc;
|
|
QualType Ty;
|
|
|
|
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.CreateFlagLoad(NRVOFlag, "nrvo.val");
|
|
CGF.Builder.CreateCondBr(DidNRVO, SkipDtorBB, RunDtorBB);
|
|
CGF.EmitBlock(RunDtorBB);
|
|
}
|
|
|
|
static_cast<Derived *>(this)->emitDestructorCall(CGF);
|
|
|
|
if (NRVO) CGF.EmitBlock(SkipDtorBB);
|
|
}
|
|
|
|
virtual ~DestroyNRVOVariable() = default;
|
|
};
|
|
|
|
struct DestroyNRVOVariableCXX final
|
|
: DestroyNRVOVariable<DestroyNRVOVariableCXX> {
|
|
DestroyNRVOVariableCXX(Address addr, QualType type,
|
|
const CXXDestructorDecl *Dtor, llvm::Value *NRVOFlag)
|
|
: DestroyNRVOVariable<DestroyNRVOVariableCXX>(addr, type, NRVOFlag),
|
|
Dtor(Dtor) {}
|
|
|
|
const CXXDestructorDecl *Dtor;
|
|
|
|
void emitDestructorCall(CodeGenFunction &CGF) {
|
|
CGF.EmitCXXDestructorCall(Dtor, Dtor_Complete,
|
|
/*ForVirtualBase=*/false,
|
|
/*Delegating=*/false, Loc, Ty);
|
|
}
|
|
};
|
|
|
|
struct DestroyNRVOVariableC final
|
|
: DestroyNRVOVariable<DestroyNRVOVariableC> {
|
|
DestroyNRVOVariableC(Address addr, llvm::Value *NRVOFlag, QualType Ty)
|
|
: DestroyNRVOVariable<DestroyNRVOVariableC>(addr, Ty, NRVOFlag) {}
|
|
|
|
void emitDestructorCall(CodeGenFunction &CGF) {
|
|
CGF.destroyNonTrivialCStruct(CGF, Loc, Ty);
|
|
}
|
|
};
|
|
|
|
struct CallStackRestore final : EHScopeStack::Cleanup {
|
|
Address Stack;
|
|
CallStackRestore(Address Stack) : Stack(Stack) {}
|
|
void Emit(CodeGenFunction &CGF, Flags flags) override {
|
|
llvm::Value *V = CGF.Builder.CreateLoad(Stack);
|
|
llvm::Function *F = CGF.CGM.getIntrinsic(llvm::Intrinsic::stackrestore);
|
|
CGF.Builder.CreateCall(F, V);
|
|
}
|
|
};
|
|
|
|
struct ExtendGCLifetime final : 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(CGF.getContext(), const_cast<VarDecl *>(&Var), false,
|
|
Var.getType(), VK_LValue, SourceLocation());
|
|
llvm::Value *value = CGF.EmitLoadOfScalar(CGF.EmitDeclRefLValue(&DRE),
|
|
SourceLocation());
|
|
CGF.EmitExtendGCLifetime(value);
|
|
}
|
|
};
|
|
|
|
struct CallCleanupFunction final : 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(CGF.getContext(), const_cast<VarDecl *>(&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).getPointer(CGF);
|
|
|
|
// 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()));
|
|
auto Callee = CGCallee::forDirect(CleanupFn);
|
|
CGF.EmitCall(FnInfo, Callee, ReturnValueSlot(), Args);
|
|
}
|
|
};
|
|
} // end anonymous namespace
|
|
|
|
/// EmitAutoVarWithLifetime - Does the setup required for an automatic
|
|
/// variable with lifetime.
|
|
static void EmitAutoVarWithLifetime(CodeGenFunction &CGF, const VarDecl &var,
|
|
Address 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<ObjCPreciseLifetimeAttr>()
|
|
? 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<Expr>(s)) {
|
|
// Skip the most common kinds of expressions that make
|
|
// hierarchy-walking expensive.
|
|
s = e = e->IgnoreParenCasts();
|
|
|
|
if (const DeclRefExpr *ref = dyn_cast<DeclRefExpr>(e))
|
|
return (ref->getDecl() == &var);
|
|
if (const BlockExpr *be = dyn_cast<BlockExpr>(e)) {
|
|
const BlockDecl *block = be->getBlockDecl();
|
|
for (const auto &I : block->captures()) {
|
|
if (I.getVariable() == &var)
|
|
return true;
|
|
}
|
|
}
|
|
}
|
|
|
|
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))
|
|
return true;
|
|
|
|
return false;
|
|
}
|
|
|
|
static bool isAccessedBy(const ValueDecl *decl, const Expr *e) {
|
|
if (!decl) return false;
|
|
if (!isa<VarDecl>(decl)) return false;
|
|
const VarDecl *var = cast<VarDecl>(decl);
|
|
return isAccessedBy(*var, e);
|
|
}
|
|
|
|
static bool tryEmitARCCopyWeakInit(CodeGenFunction &CGF,
|
|
const LValue &destLV, const Expr *init) {
|
|
bool needsCast = false;
|
|
|
|
while (auto castExpr = dyn_cast<CastExpr>(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(CGF);
|
|
if (needsCast) {
|
|
srcAddr = CGF.Builder.CreateElementBitCast(
|
|
srcAddr, destLV.getAddress(CGF).getElementType());
|
|
}
|
|
|
|
// If it was an l-value, use objc_copyWeak.
|
|
if (srcExpr->getValueKind() == VK_LValue) {
|
|
CGF.EmitARCCopyWeak(destLV.getAddress(CGF), srcAddr);
|
|
} else {
|
|
assert(srcExpr->getValueKind() == VK_XValue);
|
|
CGF.EmitARCMoveWeak(destLV.getAddress(CGF), srcAddr);
|
|
}
|
|
return true;
|
|
}
|
|
|
|
// Stop at anything else.
|
|
default:
|
|
return false;
|
|
}
|
|
|
|
init = castExpr->getSubExpr();
|
|
}
|
|
return false;
|
|
}
|
|
|
|
static void drillIntoBlockVariable(CodeGenFunction &CGF,
|
|
LValue &lvalue,
|
|
const VarDecl *var) {
|
|
lvalue.setAddress(CGF.emitBlockByrefAddress(lvalue.getAddress(CGF), var));
|
|
}
|
|
|
|
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);
|
|
}
|
|
|
|
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<VarDecl>(D));
|
|
EmitNullabilityCheck(lvalue, value, init->getExprLoc());
|
|
EmitStoreThroughLValue(RValue::get(value), lvalue, true);
|
|
return;
|
|
}
|
|
|
|
if (const CXXDefaultInitExpr *DIE = dyn_cast<CXXDefaultInitExpr>(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<ExprWithCleanups>(init))
|
|
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(emitBlockByrefAddress(tempLV.getAddress(*this),
|
|
cast<VarDecl>(D),
|
|
/*follow*/ false));
|
|
}
|
|
|
|
auto ty =
|
|
cast<llvm::PointerType>(tempLV.getAddress(*this).getElementType());
|
|
llvm::Value *zero = CGM.getNullPointer(ty, tempLV.getType());
|
|
|
|
// If __weak, we want to use a barrier under certain conditions.
|
|
if (lifetime == Qualifiers::OCL_Weak)
|
|
EmitARCInitWeak(tempLV.getAddress(*this), 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_Strong: {
|
|
if (!D || !isa<VarDecl>(D) || !cast<VarDecl>(D)->isARCPseudoStrong()) {
|
|
value = EmitARCRetainScalarExpr(init);
|
|
break;
|
|
}
|
|
// If D is pseudo-strong, treat it like __unsafe_unretained here. This means
|
|
// that we omit the retain, and causes non-autoreleased return values to be
|
|
// immediately released.
|
|
LLVM_FALLTHROUGH;
|
|
}
|
|
|
|
case Qualifiers::OCL_ExplicitNone:
|
|
value = EmitARCUnsafeUnretainedScalarExpr(init);
|
|
break;
|
|
|
|
case Qualifiers::OCL_Weak: {
|
|
// 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;
|
|
}
|
|
|
|
// 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<VarDecl>(D));
|
|
if (accessedByInit)
|
|
EmitARCStoreWeak(lvalue.getAddress(*this), value, /*ignored*/ true);
|
|
else
|
|
EmitARCInitWeak(lvalue.getAddress(*this), value);
|
|
return;
|
|
}
|
|
|
|
case Qualifiers::OCL_Autoreleasing:
|
|
value = EmitARCRetainAutoreleaseScalarExpr(init);
|
|
break;
|
|
}
|
|
|
|
if (capturedByInit) drillIntoBlockVariable(*this, lvalue, cast<VarDecl>(D));
|
|
|
|
EmitNullabilityCheck(lvalue, value, init->getExprLoc());
|
|
|
|
// 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);
|
|
}
|
|
|
|
/// Decide whether we can emit the non-zero parts of the specified initializer
|
|
/// with equal or fewer than NumStores scalar stores.
|
|
static bool canEmitInitWithFewStoresAfterBZero(llvm::Constant *Init,
|
|
unsigned &NumStores) {
|
|
// Zero and Undef never requires any extra stores.
|
|
if (isa<llvm::ConstantAggregateZero>(Init) ||
|
|
isa<llvm::ConstantPointerNull>(Init) ||
|
|
isa<llvm::UndefValue>(Init))
|
|
return true;
|
|
if (isa<llvm::ConstantInt>(Init) || isa<llvm::ConstantFP>(Init) ||
|
|
isa<llvm::ConstantVector>(Init) || isa<llvm::BlockAddress>(Init) ||
|
|
isa<llvm::ConstantExpr>(Init))
|
|
return Init->isNullValue() || NumStores--;
|
|
|
|
// See if we can emit each element.
|
|
if (isa<llvm::ConstantArray>(Init) || isa<llvm::ConstantStruct>(Init)) {
|
|
for (unsigned i = 0, e = Init->getNumOperands(); i != e; ++i) {
|
|
llvm::Constant *Elt = cast<llvm::Constant>(Init->getOperand(i));
|
|
if (!canEmitInitWithFewStoresAfterBZero(Elt, NumStores))
|
|
return false;
|
|
}
|
|
return true;
|
|
}
|
|
|
|
if (llvm::ConstantDataSequential *CDS =
|
|
dyn_cast<llvm::ConstantDataSequential>(Init)) {
|
|
for (unsigned i = 0, e = CDS->getNumElements(); i != e; ++i) {
|
|
llvm::Constant *Elt = CDS->getElementAsConstant(i);
|
|
if (!canEmitInitWithFewStoresAfterBZero(Elt, NumStores))
|
|
return false;
|
|
}
|
|
return true;
|
|
}
|
|
|
|
// Anything else is hard and scary.
|
|
return false;
|
|
}
|
|
|
|
/// For inits that canEmitInitWithFewStoresAfterBZero returned true for, emit
|
|
/// the scalar stores that would be required.
|
|
static void emitStoresForInitAfterBZero(CodeGenModule &CGM,
|
|
llvm::Constant *Init, Address Loc,
|
|
bool isVolatile, CGBuilderTy &Builder,
|
|
bool IsAutoInit) {
|
|
assert(!Init->isNullValue() && !isa<llvm::UndefValue>(Init) &&
|
|
"called emitStoresForInitAfterBZero for zero or undef value.");
|
|
|
|
if (isa<llvm::ConstantInt>(Init) || isa<llvm::ConstantFP>(Init) ||
|
|
isa<llvm::ConstantVector>(Init) || isa<llvm::BlockAddress>(Init) ||
|
|
isa<llvm::ConstantExpr>(Init)) {
|
|
auto *I = Builder.CreateStore(Init, Loc, isVolatile);
|
|
if (IsAutoInit)
|
|
I->addAnnotationMetadata("auto-init");
|
|
return;
|
|
}
|
|
|
|
if (llvm::ConstantDataSequential *CDS =
|
|
dyn_cast<llvm::ConstantDataSequential>(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<llvm::UndefValue>(Elt))
|
|
emitStoresForInitAfterBZero(
|
|
CGM, Elt, Builder.CreateConstInBoundsGEP2_32(Loc, 0, i), isVolatile,
|
|
Builder, IsAutoInit);
|
|
}
|
|
return;
|
|
}
|
|
|
|
assert((isa<llvm::ConstantStruct>(Init) || isa<llvm::ConstantArray>(Init)) &&
|
|
"Unknown value type!");
|
|
|
|
for (unsigned i = 0, e = Init->getNumOperands(); i != e; ++i) {
|
|
llvm::Constant *Elt = cast<llvm::Constant>(Init->getOperand(i));
|
|
|
|
// If necessary, get a pointer to the element and emit it.
|
|
if (!Elt->isNullValue() && !isa<llvm::UndefValue>(Elt))
|
|
emitStoresForInitAfterBZero(CGM, Elt,
|
|
Builder.CreateConstInBoundsGEP2_32(Loc, 0, i),
|
|
isVolatile, Builder, IsAutoInit);
|
|
}
|
|
}
|
|
|
|
/// Decide whether we should use bzero plus some stores to initialize a local
|
|
/// variable instead of using a memcpy from a constant global. It is beneficial
|
|
/// to use bzero if the global is all zeros, or mostly zeros and large.
|
|
static bool shouldUseBZeroPlusStoresToInitialize(llvm::Constant *Init,
|
|
uint64_t GlobalSize) {
|
|
// If a global is all zeros, always use a bzero.
|
|
if (isa<llvm::ConstantAggregateZero>(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 &&
|
|
canEmitInitWithFewStoresAfterBZero(Init, StoreBudget);
|
|
}
|
|
|
|
/// Decide whether we should use memset to initialize a local variable instead
|
|
/// of using a memcpy from a constant global. Assumes we've already decided to
|
|
/// not user bzero.
|
|
/// FIXME We could be more clever, as we are for bzero above, and generate
|
|
/// memset followed by stores. It's unclear that's worth the effort.
|
|
static llvm::Value *shouldUseMemSetToInitialize(llvm::Constant *Init,
|
|
uint64_t GlobalSize,
|
|
const llvm::DataLayout &DL) {
|
|
uint64_t SizeLimit = 32;
|
|
if (GlobalSize <= SizeLimit)
|
|
return nullptr;
|
|
return llvm::isBytewiseValue(Init, DL);
|
|
}
|
|
|
|
/// Decide whether we want to split a constant structure or array store into a
|
|
/// sequence of its fields' stores. This may cost us code size and compilation
|
|
/// speed, but plays better with store optimizations.
|
|
static bool shouldSplitConstantStore(CodeGenModule &CGM,
|
|
uint64_t GlobalByteSize) {
|
|
// Don't break things that occupy more than one cacheline.
|
|
uint64_t ByteSizeLimit = 64;
|
|
if (CGM.getCodeGenOpts().OptimizationLevel == 0)
|
|
return false;
|
|
if (GlobalByteSize <= ByteSizeLimit)
|
|
return true;
|
|
return false;
|
|
}
|
|
|
|
enum class IsPattern { No, Yes };
|
|
|
|
/// Generate a constant filled with either a pattern or zeroes.
|
|
static llvm::Constant *patternOrZeroFor(CodeGenModule &CGM, IsPattern isPattern,
|
|
llvm::Type *Ty) {
|
|
if (isPattern == IsPattern::Yes)
|
|
return initializationPatternFor(CGM, Ty);
|
|
else
|
|
return llvm::Constant::getNullValue(Ty);
|
|
}
|
|
|
|
static llvm::Constant *constWithPadding(CodeGenModule &CGM, IsPattern isPattern,
|
|
llvm::Constant *constant);
|
|
|
|
/// Helper function for constWithPadding() to deal with padding in structures.
|
|
static llvm::Constant *constStructWithPadding(CodeGenModule &CGM,
|
|
IsPattern isPattern,
|
|
llvm::StructType *STy,
|
|
llvm::Constant *constant) {
|
|
const llvm::DataLayout &DL = CGM.getDataLayout();
|
|
const llvm::StructLayout *Layout = DL.getStructLayout(STy);
|
|
llvm::Type *Int8Ty = llvm::IntegerType::getInt8Ty(CGM.getLLVMContext());
|
|
unsigned SizeSoFar = 0;
|
|
SmallVector<llvm::Constant *, 8> Values;
|
|
bool NestedIntact = true;
|
|
for (unsigned i = 0, e = STy->getNumElements(); i != e; i++) {
|
|
unsigned CurOff = Layout->getElementOffset(i);
|
|
if (SizeSoFar < CurOff) {
|
|
assert(!STy->isPacked());
|
|
auto *PadTy = llvm::ArrayType::get(Int8Ty, CurOff - SizeSoFar);
|
|
Values.push_back(patternOrZeroFor(CGM, isPattern, PadTy));
|
|
}
|
|
llvm::Constant *CurOp;
|
|
if (constant->isZeroValue())
|
|
CurOp = llvm::Constant::getNullValue(STy->getElementType(i));
|
|
else
|
|
CurOp = cast<llvm::Constant>(constant->getAggregateElement(i));
|
|
auto *NewOp = constWithPadding(CGM, isPattern, CurOp);
|
|
if (CurOp != NewOp)
|
|
NestedIntact = false;
|
|
Values.push_back(NewOp);
|
|
SizeSoFar = CurOff + DL.getTypeAllocSize(CurOp->getType());
|
|
}
|
|
unsigned TotalSize = Layout->getSizeInBytes();
|
|
if (SizeSoFar < TotalSize) {
|
|
auto *PadTy = llvm::ArrayType::get(Int8Ty, TotalSize - SizeSoFar);
|
|
Values.push_back(patternOrZeroFor(CGM, isPattern, PadTy));
|
|
}
|
|
if (NestedIntact && Values.size() == STy->getNumElements())
|
|
return constant;
|
|
return llvm::ConstantStruct::getAnon(Values, STy->isPacked());
|
|
}
|
|
|
|
/// Replace all padding bytes in a given constant with either a pattern byte or
|
|
/// 0x00.
|
|
static llvm::Constant *constWithPadding(CodeGenModule &CGM, IsPattern isPattern,
|
|
llvm::Constant *constant) {
|
|
llvm::Type *OrigTy = constant->getType();
|
|
if (const auto STy = dyn_cast<llvm::StructType>(OrigTy))
|
|
return constStructWithPadding(CGM, isPattern, STy, constant);
|
|
if (auto *ArrayTy = dyn_cast<llvm::ArrayType>(OrigTy)) {
|
|
llvm::SmallVector<llvm::Constant *, 8> Values;
|
|
uint64_t Size = ArrayTy->getNumElements();
|
|
if (!Size)
|
|
return constant;
|
|
llvm::Type *ElemTy = ArrayTy->getElementType();
|
|
bool ZeroInitializer = constant->isNullValue();
|
|
llvm::Constant *OpValue, *PaddedOp;
|
|
if (ZeroInitializer) {
|
|
OpValue = llvm::Constant::getNullValue(ElemTy);
|
|
PaddedOp = constWithPadding(CGM, isPattern, OpValue);
|
|
}
|
|
for (unsigned Op = 0; Op != Size; ++Op) {
|
|
if (!ZeroInitializer) {
|
|
OpValue = constant->getAggregateElement(Op);
|
|
PaddedOp = constWithPadding(CGM, isPattern, OpValue);
|
|
}
|
|
Values.push_back(PaddedOp);
|
|
}
|
|
auto *NewElemTy = Values[0]->getType();
|
|
if (NewElemTy == ElemTy)
|
|
return constant;
|
|
auto *NewArrayTy = llvm::ArrayType::get(NewElemTy, Size);
|
|
return llvm::ConstantArray::get(NewArrayTy, Values);
|
|
}
|
|
// FIXME: Add handling for tail padding in vectors. Vectors don't
|
|
// have padding between or inside elements, but the total amount of
|
|
// data can be less than the allocated size.
|
|
return constant;
|
|
}
|
|
|
|
Address CodeGenModule::createUnnamedGlobalFrom(const VarDecl &D,
|
|
llvm::Constant *Constant,
|
|
CharUnits Align) {
|
|
auto FunctionName = [&](const DeclContext *DC) -> std::string {
|
|
if (const auto *FD = dyn_cast<FunctionDecl>(DC)) {
|
|
if (const auto *CC = dyn_cast<CXXConstructorDecl>(FD))
|
|
return CC->getNameAsString();
|
|
if (const auto *CD = dyn_cast<CXXDestructorDecl>(FD))
|
|
return CD->getNameAsString();
|
|
return std::string(getMangledName(FD));
|
|
} else if (const auto *OM = dyn_cast<ObjCMethodDecl>(DC)) {
|
|
return OM->getNameAsString();
|
|
} else if (isa<BlockDecl>(DC)) {
|
|
return "<block>";
|
|
} else if (isa<CapturedDecl>(DC)) {
|
|
return "<captured>";
|
|
} else {
|
|
llvm_unreachable("expected a function or method");
|
|
}
|
|
};
|
|
|
|
// Form a simple per-variable cache of these values in case we find we
|
|
// want to reuse them.
|
|
llvm::GlobalVariable *&CacheEntry = InitializerConstants[&D];
|
|
if (!CacheEntry || CacheEntry->getInitializer() != Constant) {
|
|
auto *Ty = Constant->getType();
|
|
bool isConstant = true;
|
|
llvm::GlobalVariable *InsertBefore = nullptr;
|
|
unsigned AS =
|
|
getContext().getTargetAddressSpace(getStringLiteralAddressSpace());
|
|
std::string Name;
|
|
if (D.hasGlobalStorage())
|
|
Name = getMangledName(&D).str() + ".const";
|
|
else if (const DeclContext *DC = D.getParentFunctionOrMethod())
|
|
Name = ("__const." + FunctionName(DC) + "." + D.getName()).str();
|
|
else
|
|
llvm_unreachable("local variable has no parent function or method");
|
|
llvm::GlobalVariable *GV = new llvm::GlobalVariable(
|
|
getModule(), Ty, isConstant, llvm::GlobalValue::PrivateLinkage,
|
|
Constant, Name, InsertBefore, llvm::GlobalValue::NotThreadLocal, AS);
|
|
GV->setAlignment(Align.getAsAlign());
|
|
GV->setUnnamedAddr(llvm::GlobalValue::UnnamedAddr::Global);
|
|
CacheEntry = GV;
|
|
} else if (CacheEntry->getAlignment() < Align.getQuantity()) {
|
|
CacheEntry->setAlignment(Align.getAsAlign());
|
|
}
|
|
|
|
return Address(CacheEntry, Align);
|
|
}
|
|
|
|
static Address createUnnamedGlobalForMemcpyFrom(CodeGenModule &CGM,
|
|
const VarDecl &D,
|
|
CGBuilderTy &Builder,
|
|
llvm::Constant *Constant,
|
|
CharUnits Align) {
|
|
Address SrcPtr = CGM.createUnnamedGlobalFrom(D, Constant, Align);
|
|
llvm::Type *BP = llvm::PointerType::getInt8PtrTy(CGM.getLLVMContext(),
|
|
SrcPtr.getAddressSpace());
|
|
if (SrcPtr.getType() != BP)
|
|
SrcPtr = Builder.CreateBitCast(SrcPtr, BP);
|
|
return SrcPtr;
|
|
}
|
|
|
|
static void emitStoresForConstant(CodeGenModule &CGM, const VarDecl &D,
|
|
Address Loc, bool isVolatile,
|
|
CGBuilderTy &Builder,
|
|
llvm::Constant *constant, bool IsAutoInit) {
|
|
auto *Ty = constant->getType();
|
|
uint64_t ConstantSize = CGM.getDataLayout().getTypeAllocSize(Ty);
|
|
if (!ConstantSize)
|
|
return;
|
|
|
|
bool canDoSingleStore = Ty->isIntOrIntVectorTy() ||
|
|
Ty->isPtrOrPtrVectorTy() || Ty->isFPOrFPVectorTy();
|
|
if (canDoSingleStore) {
|
|
auto *I = Builder.CreateStore(constant, Loc, isVolatile);
|
|
if (IsAutoInit)
|
|
I->addAnnotationMetadata("auto-init");
|
|
return;
|
|
}
|
|
|
|
auto *SizeVal = llvm::ConstantInt::get(CGM.IntPtrTy, ConstantSize);
|
|
|
|
// If the initializer is all or mostly the same, codegen with bzero / memset
|
|
// then do a few stores afterward.
|
|
if (shouldUseBZeroPlusStoresToInitialize(constant, ConstantSize)) {
|
|
auto *I = Builder.CreateMemSet(Loc, llvm::ConstantInt::get(CGM.Int8Ty, 0),
|
|
SizeVal, isVolatile);
|
|
if (IsAutoInit)
|
|
I->addAnnotationMetadata("auto-init");
|
|
|
|
bool valueAlreadyCorrect =
|
|
constant->isNullValue() || isa<llvm::UndefValue>(constant);
|
|
if (!valueAlreadyCorrect) {
|
|
Loc = Builder.CreateBitCast(Loc, Ty->getPointerTo(Loc.getAddressSpace()));
|
|
emitStoresForInitAfterBZero(CGM, constant, Loc, isVolatile, Builder,
|
|
IsAutoInit);
|
|
}
|
|
return;
|
|
}
|
|
|
|
// If the initializer is a repeated byte pattern, use memset.
|
|
llvm::Value *Pattern =
|
|
shouldUseMemSetToInitialize(constant, ConstantSize, CGM.getDataLayout());
|
|
if (Pattern) {
|
|
uint64_t Value = 0x00;
|
|
if (!isa<llvm::UndefValue>(Pattern)) {
|
|
const llvm::APInt &AP = cast<llvm::ConstantInt>(Pattern)->getValue();
|
|
assert(AP.getBitWidth() <= 8);
|
|
Value = AP.getLimitedValue();
|
|
}
|
|
auto *I = Builder.CreateMemSet(
|
|
Loc, llvm::ConstantInt::get(CGM.Int8Ty, Value), SizeVal, isVolatile);
|
|
if (IsAutoInit)
|
|
I->addAnnotationMetadata("auto-init");
|
|
return;
|
|
}
|
|
|
|
// If the initializer is small, use a handful of stores.
|
|
if (shouldSplitConstantStore(CGM, ConstantSize)) {
|
|
if (auto *STy = dyn_cast<llvm::StructType>(Ty)) {
|
|
// FIXME: handle the case when STy != Loc.getElementType().
|
|
if (STy == Loc.getElementType()) {
|
|
for (unsigned i = 0; i != constant->getNumOperands(); i++) {
|
|
Address EltPtr = Builder.CreateStructGEP(Loc, i);
|
|
emitStoresForConstant(
|
|
CGM, D, EltPtr, isVolatile, Builder,
|
|
cast<llvm::Constant>(Builder.CreateExtractValue(constant, i)),
|
|
IsAutoInit);
|
|
}
|
|
return;
|
|
}
|
|
} else if (auto *ATy = dyn_cast<llvm::ArrayType>(Ty)) {
|
|
// FIXME: handle the case when ATy != Loc.getElementType().
|
|
if (ATy == Loc.getElementType()) {
|
|
for (unsigned i = 0; i != ATy->getNumElements(); i++) {
|
|
Address EltPtr = Builder.CreateConstArrayGEP(Loc, i);
|
|
emitStoresForConstant(
|
|
CGM, D, EltPtr, isVolatile, Builder,
|
|
cast<llvm::Constant>(Builder.CreateExtractValue(constant, i)),
|
|
IsAutoInit);
|
|
}
|
|
return;
|
|
}
|
|
}
|
|
}
|
|
|
|
// Copy from a global.
|
|
auto *I =
|
|
Builder.CreateMemCpy(Loc,
|
|
createUnnamedGlobalForMemcpyFrom(
|
|
CGM, D, Builder, constant, Loc.getAlignment()),
|
|
SizeVal, isVolatile);
|
|
if (IsAutoInit)
|
|
I->addAnnotationMetadata("auto-init");
|
|
}
|
|
|
|
static void emitStoresForZeroInit(CodeGenModule &CGM, const VarDecl &D,
|
|
Address Loc, bool isVolatile,
|
|
CGBuilderTy &Builder) {
|
|
llvm::Type *ElTy = Loc.getElementType();
|
|
llvm::Constant *constant =
|
|
constWithPadding(CGM, IsPattern::No, llvm::Constant::getNullValue(ElTy));
|
|
emitStoresForConstant(CGM, D, Loc, isVolatile, Builder, constant,
|
|
/*IsAutoInit=*/true);
|
|
}
|
|
|
|
static void emitStoresForPatternInit(CodeGenModule &CGM, const VarDecl &D,
|
|
Address Loc, bool isVolatile,
|
|
CGBuilderTy &Builder) {
|
|
llvm::Type *ElTy = Loc.getElementType();
|
|
llvm::Constant *constant = constWithPadding(
|
|
CGM, IsPattern::Yes, initializationPatternFor(CGM, ElTy));
|
|
assert(!isa<llvm::UndefValue>(constant));
|
|
emitStoresForConstant(CGM, D, Loc, isVolatile, Builder, constant,
|
|
/*IsAutoInit=*/true);
|
|
}
|
|
|
|
static bool containsUndef(llvm::Constant *constant) {
|
|
auto *Ty = constant->getType();
|
|
if (isa<llvm::UndefValue>(constant))
|
|
return true;
|
|
if (Ty->isStructTy() || Ty->isArrayTy() || Ty->isVectorTy())
|
|
for (llvm::Use &Op : constant->operands())
|
|
if (containsUndef(cast<llvm::Constant>(Op)))
|
|
return true;
|
|
return false;
|
|
}
|
|
|
|
static llvm::Constant *replaceUndef(CodeGenModule &CGM, IsPattern isPattern,
|
|
llvm::Constant *constant) {
|
|
auto *Ty = constant->getType();
|
|
if (isa<llvm::UndefValue>(constant))
|
|
return patternOrZeroFor(CGM, isPattern, Ty);
|
|
if (!(Ty->isStructTy() || Ty->isArrayTy() || Ty->isVectorTy()))
|
|
return constant;
|
|
if (!containsUndef(constant))
|
|
return constant;
|
|
llvm::SmallVector<llvm::Constant *, 8> Values(constant->getNumOperands());
|
|
for (unsigned Op = 0, NumOp = constant->getNumOperands(); Op != NumOp; ++Op) {
|
|
auto *OpValue = cast<llvm::Constant>(constant->getOperand(Op));
|
|
Values[Op] = replaceUndef(CGM, isPattern, OpValue);
|
|
}
|
|
if (Ty->isStructTy())
|
|
return llvm::ConstantStruct::get(cast<llvm::StructType>(Ty), Values);
|
|
if (Ty->isArrayTy())
|
|
return llvm::ConstantArray::get(cast<llvm::ArrayType>(Ty), Values);
|
|
assert(Ty->isVectorTy());
|
|
return llvm::ConstantVector::get(Values);
|
|
}
|
|
|
|
/// 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);
|
|
}
|
|
|
|
/// 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) {
|
|
if (!ShouldEmitLifetimeMarkers)
|
|
return nullptr;
|
|
|
|
assert(Addr->getType()->getPointerAddressSpace() ==
|
|
CGM.getDataLayout().getAllocaAddrSpace() &&
|
|
"Pointer should be in alloca address space");
|
|
llvm::Value *SizeV = llvm::ConstantInt::get(Int64Ty, Size);
|
|
Addr = Builder.CreateBitCast(Addr, AllocaInt8PtrTy);
|
|
llvm::CallInst *C =
|
|
Builder.CreateCall(CGM.getLLVMLifetimeStartFn(), {SizeV, Addr});
|
|
C->setDoesNotThrow();
|
|
return SizeV;
|
|
}
|
|
|
|
void CodeGenFunction::EmitLifetimeEnd(llvm::Value *Size, llvm::Value *Addr) {
|
|
assert(Addr->getType()->getPointerAddressSpace() ==
|
|
CGM.getDataLayout().getAllocaAddrSpace() &&
|
|
"Pointer should be in alloca address space");
|
|
Addr = Builder.CreateBitCast(Addr, AllocaInt8PtrTy);
|
|
llvm::CallInst *C =
|
|
Builder.CreateCall(CGM.getLLVMLifetimeEndFn(), {Size, Addr});
|
|
C->setDoesNotThrow();
|
|
}
|
|
|
|
void CodeGenFunction::EmitAndRegisterVariableArrayDimensions(
|
|
CGDebugInfo *DI, const VarDecl &D, bool EmitDebugInfo) {
|
|
// For each dimension stores its QualType and corresponding
|
|
// size-expression Value.
|
|
SmallVector<CodeGenFunction::VlaSizePair, 4> Dimensions;
|
|
SmallVector<IdentifierInfo *, 4> VLAExprNames;
|
|
|
|
// Break down the array into individual dimensions.
|
|
QualType Type1D = D.getType();
|
|
while (getContext().getAsVariableArrayType(Type1D)) {
|
|
auto VlaSize = getVLAElements1D(Type1D);
|
|
if (auto *C = dyn_cast<llvm::ConstantInt>(VlaSize.NumElts))
|
|
Dimensions.emplace_back(C, Type1D.getUnqualifiedType());
|
|
else {
|
|
// Generate a locally unique name for the size expression.
|
|
Twine Name = Twine("__vla_expr") + Twine(VLAExprCounter++);
|
|
SmallString<12> Buffer;
|
|
StringRef NameRef = Name.toStringRef(Buffer);
|
|
auto &Ident = getContext().Idents.getOwn(NameRef);
|
|
VLAExprNames.push_back(&Ident);
|
|
auto SizeExprAddr =
|
|
CreateDefaultAlignTempAlloca(VlaSize.NumElts->getType(), NameRef);
|
|
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.
|
|
unsigned NameIdx = 0;
|
|
for (auto &VlaSize : Dimensions) {
|
|
llvm::Metadata *MD;
|
|
if (auto *C = dyn_cast<llvm::ConstantInt>(VlaSize.NumElts))
|
|
MD = llvm::ConstantAsMetadata::get(C);
|
|
else {
|
|
// Create an artificial VarDecl to generate debug info for.
|
|
IdentifierInfo *NameIdent = VLAExprNames[NameIdx++];
|
|
auto VlaExprTy = VlaSize.NumElts->getType()->getPointerElementType();
|
|
auto QT = getContext().getIntTypeForBitwidth(
|
|
VlaExprTy->getScalarSizeInBits(), false);
|
|
auto *ArtificialDecl = VarDecl::Create(
|
|
getContext(), const_cast<DeclContext *>(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);
|
|
}
|
|
}
|
|
|
|
/// 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();
|
|
assert(
|
|
Ty.getAddressSpace() == LangAS::Default ||
|
|
(Ty.getAddressSpace() == LangAS::opencl_private && getLangOpts().OpenCL));
|
|
|
|
AutoVarEmission emission(D);
|
|
|
|
bool isEscapingByRef = D.isEscapingByref();
|
|
emission.IsEscapingByRef = isEscapingByRef;
|
|
|
|
CharUnits alignment = getContext().getDeclAlign(&D);
|
|
|
|
// If the type is variably-modified, emit all the VLA sizes for it.
|
|
if (Ty->isVariablyModifiedType())
|
|
EmitVariablyModifiedType(Ty);
|
|
|
|
auto *DI = getDebugInfo();
|
|
bool EmitDebugInfo = DI && CGM.getCodeGenOpts().hasReducedDebugInfo();
|
|
|
|
Address address = Address::invalid();
|
|
Address AllocaAddr = Address::invalid();
|
|
Address OpenMPLocalAddr = Address::invalid();
|
|
if (CGM.getLangOpts().OpenMPIRBuilder)
|
|
OpenMPLocalAddr = OMPBuilderCBHelpers::getAddressOfLocalVariable(*this, &D);
|
|
else
|
|
OpenMPLocalAddr =
|
|
getLangOpts().OpenMP
|
|
? CGM.getOpenMPRuntime().getAddressOfLocalVariable(*this, &D)
|
|
: Address::invalid();
|
|
|
|
bool NRVO = getLangOpts().ElideConstructors && D.isNRVOVariable();
|
|
|
|
if (getLangOpts().OpenMP && OpenMPLocalAddr.isValid()) {
|
|
address = OpenMPLocalAddr;
|
|
} else if (Ty->isConstantSizeType()) {
|
|
// 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.
|
|
// 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 &&
|
|
!isEscapingByRef && CGM.isTypeConstant(Ty, true))) {
|
|
EmitStaticVarDecl(D, llvm::GlobalValue::InternalLinkage);
|
|
|
|
// Signal this condition to later callbacks.
|
|
emission.Addr = Address::invalid();
|
|
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.
|
|
// - we are compiling OpenMP and it's an OpenMP local variable.
|
|
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).
|
|
address = ReturnValue;
|
|
|
|
if (const RecordType *RecordTy = Ty->getAs<RecordType>()) {
|
|
const auto *RD = RecordTy->getDecl();
|
|
const auto *CXXRD = dyn_cast<CXXRecordDecl>(RD);
|
|
if ((CXXRD && !CXXRD->hasTrivialDestructor()) ||
|
|
RD->isNonTrivialToPrimitiveDestroy()) {
|
|
// 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();
|
|
Address NRVOFlag =
|
|
CreateTempAlloca(Zero->getType(), CharUnits::One(), "nrvo");
|
|
EnsureInsertPoint();
|
|
Builder.CreateStore(Zero, NRVOFlag);
|
|
|
|
// Record the NRVO flag for this variable.
|
|
NRVOFlags[&D] = NRVOFlag.getPointer();
|
|
emission.NRVOFlag = NRVOFlag.getPointer();
|
|
}
|
|
}
|
|
} else {
|
|
CharUnits allocaAlignment;
|
|
llvm::Type *allocaTy;
|
|
if (isEscapingByRef) {
|
|
auto &byrefInfo = getBlockByrefInfo(&D);
|
|
allocaTy = byrefInfo.Type;
|
|
allocaAlignment = byrefInfo.ByrefAlignment;
|
|
} else {
|
|
allocaTy = ConvertTypeForMem(Ty);
|
|
allocaAlignment = alignment;
|
|
}
|
|
|
|
// 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, D.getName(),
|
|
/*ArraySize=*/nullptr, &AllocaAddr);
|
|
|
|
// 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();
|
|
|
|
// Emit a lifetime intrinsic if meaningful. There's no point in doing this
|
|
// if we don't have a valid insertion point (?).
|
|
if (HaveInsertPoint() && !IsMSCatchParam) {
|
|
// 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())) {
|
|
llvm::TypeSize size =
|
|
CGM.getDataLayout().getTypeAllocSize(allocaTy);
|
|
emission.SizeForLifetimeMarkers =
|
|
size.isScalable() ? EmitLifetimeStart(-1, AllocaAddr.getPointer())
|
|
: EmitLifetimeStart(size.getFixedSize(),
|
|
AllocaAddr.getPointer());
|
|
}
|
|
} else {
|
|
assert(!emission.useLifetimeMarkers());
|
|
}
|
|
}
|
|
} else {
|
|
EnsureInsertPoint();
|
|
|
|
if (!DidCallStackSave) {
|
|
// Save the stack.
|
|
Address Stack =
|
|
CreateTempAlloca(Int8PtrTy, getPointerAlign(), "saved_stack");
|
|
|
|
llvm::Function *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);
|
|
}
|
|
|
|
auto VlaSize = getVLASize(Ty);
|
|
llvm::Type *llvmTy = ConvertTypeForMem(VlaSize.Type);
|
|
|
|
// Allocate memory for the array.
|
|
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);
|
|
}
|
|
|
|
setAddrOfLocalVar(&D, address);
|
|
emission.Addr = address;
|
|
emission.AllocaAddr = AllocaAddr;
|
|
|
|
// Emit debug info for local var declaration.
|
|
if (EmitDebugInfo && HaveInsertPoint()) {
|
|
Address DebugAddr = address;
|
|
bool UsePointerValue = NRVO && ReturnValuePointer.isValid();
|
|
DI->setLocation(D.getLocation());
|
|
|
|
// If NRVO, use a pointer to the return address.
|
|
if (UsePointerValue)
|
|
DebugAddr = ReturnValuePointer;
|
|
|
|
(void)DI->EmitDeclareOfAutoVariable(&D, DebugAddr.getPointer(), Builder,
|
|
UsePointerValue);
|
|
}
|
|
|
|
if (D.hasAttr<AnnotateAttr>() && HaveInsertPoint())
|
|
EmitVarAnnotations(&D, address.getPointer());
|
|
|
|
// Make sure we call @llvm.lifetime.end.
|
|
if (emission.useLifetimeMarkers())
|
|
EHStack.pushCleanup<CallLifetimeEnd>(NormalEHLifetimeMarker,
|
|
emission.getOriginalAllocatedAddress(),
|
|
emission.getSizeForLifetimeMarkers());
|
|
|
|
return emission;
|
|
}
|
|
|
|
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<Expr>(S))
|
|
return isCapturedBy(Var, E);
|
|
for (const Stmt *SubStmt : S->children())
|
|
if (isCapturedBy(Var, SubStmt))
|
|
return true;
|
|
return false;
|
|
}
|
|
|
|
/// 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<BlockExpr>(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<StmtExpr>(E)) {
|
|
const CompoundStmt *CS = SE->getSubStmt();
|
|
for (const auto *BI : CS->body())
|
|
if (const auto *BIE = dyn_cast<Expr>(BI)) {
|
|
if (isCapturedBy(Var, BIE))
|
|
return true;
|
|
}
|
|
else if (const auto *DS = dyn_cast<DeclStmt>(BI)) {
|
|
// special case declarations
|
|
for (const auto *I : DS->decls()) {
|
|
if (const auto *VD = dyn_cast<VarDecl>((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 (const Stmt *SubStmt : E->children())
|
|
if (isCapturedBy(Var, SubStmt))
|
|
return true;
|
|
|
|
return false;
|
|
}
|
|
|
|
/// Determine whether the given initializer is trivial in the sense
|
|
/// that it requires no code to be generated.
|
|
bool CodeGenFunction::isTrivialInitializer(const Expr *Init) {
|
|
if (!Init)
|
|
return true;
|
|
|
|
if (const CXXConstructExpr *Construct = dyn_cast<CXXConstructExpr>(Init))
|
|
if (CXXConstructorDecl *Constructor = Construct->getConstructor())
|
|
if (Constructor->isTrivial() &&
|
|
Constructor->isDefaultConstructor() &&
|
|
!Construct->requiresZeroInitialization())
|
|
return true;
|
|
|
|
return false;
|
|
}
|
|
|
|
void CodeGenFunction::emitZeroOrPatternForAutoVarInit(QualType type,
|
|
const VarDecl &D,
|
|
Address Loc) {
|
|
auto trivialAutoVarInit = getContext().getLangOpts().getTrivialAutoVarInit();
|
|
CharUnits Size = getContext().getTypeSizeInChars(type);
|
|
bool isVolatile = type.isVolatileQualified();
|
|
if (!Size.isZero()) {
|
|
switch (trivialAutoVarInit) {
|
|
case LangOptions::TrivialAutoVarInitKind::Uninitialized:
|
|
llvm_unreachable("Uninitialized handled by caller");
|
|
case LangOptions::TrivialAutoVarInitKind::Zero:
|
|
if (CGM.stopAutoInit())
|
|
return;
|
|
emitStoresForZeroInit(CGM, D, Loc, isVolatile, Builder);
|
|
break;
|
|
case LangOptions::TrivialAutoVarInitKind::Pattern:
|
|
if (CGM.stopAutoInit())
|
|
return;
|
|
emitStoresForPatternInit(CGM, D, Loc, isVolatile, Builder);
|
|
break;
|
|
}
|
|
return;
|
|
}
|
|
|
|
// VLAs look zero-sized to getTypeInfo. We can't emit constant stores to
|
|
// them, so emit a memcpy with the VLA size to initialize each element.
|
|
// Technically zero-sized or negative-sized VLAs are undefined, and UBSan
|
|
// will catch that code, but there exists code which generates zero-sized
|
|
// VLAs. Be nice and initialize whatever they requested.
|
|
const auto *VlaType = getContext().getAsVariableArrayType(type);
|
|
if (!VlaType)
|
|
return;
|
|
auto VlaSize = getVLASize(VlaType);
|
|
auto SizeVal = VlaSize.NumElts;
|
|
CharUnits EltSize = getContext().getTypeSizeInChars(VlaSize.Type);
|
|
switch (trivialAutoVarInit) {
|
|
case LangOptions::TrivialAutoVarInitKind::Uninitialized:
|
|
llvm_unreachable("Uninitialized handled by caller");
|
|
|
|
case LangOptions::TrivialAutoVarInitKind::Zero: {
|
|
if (CGM.stopAutoInit())
|
|
return;
|
|
if (!EltSize.isOne())
|
|
SizeVal = Builder.CreateNUWMul(SizeVal, CGM.getSize(EltSize));
|
|
auto *I = Builder.CreateMemSet(Loc, llvm::ConstantInt::get(Int8Ty, 0),
|
|
SizeVal, isVolatile);
|
|
I->addAnnotationMetadata("auto-init");
|
|
break;
|
|
}
|
|
|
|
case LangOptions::TrivialAutoVarInitKind::Pattern: {
|
|
if (CGM.stopAutoInit())
|
|
return;
|
|
llvm::Type *ElTy = Loc.getElementType();
|
|
llvm::Constant *Constant = constWithPadding(
|
|
CGM, IsPattern::Yes, initializationPatternFor(CGM, ElTy));
|
|
CharUnits ConstantAlign = getContext().getTypeAlignInChars(VlaSize.Type);
|
|
llvm::BasicBlock *SetupBB = createBasicBlock("vla-setup.loop");
|
|
llvm::BasicBlock *LoopBB = createBasicBlock("vla-init.loop");
|
|
llvm::BasicBlock *ContBB = createBasicBlock("vla-init.cont");
|
|
llvm::Value *IsZeroSizedVLA = Builder.CreateICmpEQ(
|
|
SizeVal, llvm::ConstantInt::get(SizeVal->getType(), 0),
|
|
"vla.iszerosized");
|
|
Builder.CreateCondBr(IsZeroSizedVLA, ContBB, SetupBB);
|
|
EmitBlock(SetupBB);
|
|
if (!EltSize.isOne())
|
|
SizeVal = Builder.CreateNUWMul(SizeVal, CGM.getSize(EltSize));
|
|
llvm::Value *BaseSizeInChars =
|
|
llvm::ConstantInt::get(IntPtrTy, EltSize.getQuantity());
|
|
Address Begin = Builder.CreateElementBitCast(Loc, Int8Ty, "vla.begin");
|
|
llvm::Value *End =
|
|
Builder.CreateInBoundsGEP(Begin.getPointer(), SizeVal, "vla.end");
|
|
llvm::BasicBlock *OriginBB = Builder.GetInsertBlock();
|
|
EmitBlock(LoopBB);
|
|
llvm::PHINode *Cur = Builder.CreatePHI(Begin.getType(), 2, "vla.cur");
|
|
Cur->addIncoming(Begin.getPointer(), OriginBB);
|
|
CharUnits CurAlign = Loc.getAlignment().alignmentOfArrayElement(EltSize);
|
|
auto *I =
|
|
Builder.CreateMemCpy(Address(Cur, CurAlign),
|
|
createUnnamedGlobalForMemcpyFrom(
|
|
CGM, D, Builder, Constant, ConstantAlign),
|
|
BaseSizeInChars, isVolatile);
|
|
I->addAnnotationMetadata("auto-init");
|
|
llvm::Value *Next =
|
|
Builder.CreateInBoundsGEP(Int8Ty, Cur, BaseSizeInChars, "vla.next");
|
|
llvm::Value *Done = Builder.CreateICmpEQ(Next, End, "vla-init.isdone");
|
|
Builder.CreateCondBr(Done, ContBB, LoopBB);
|
|
Cur->addIncoming(Next, LoopBB);
|
|
EmitBlock(ContBB);
|
|
} break;
|
|
}
|
|
}
|
|
|
|
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;
|
|
auto DL = ApplyDebugLocation::CreateDefaultArtificial(*this, D.getLocation());
|
|
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.IsEscapingByRef)
|
|
emitByrefStructureInit(emission);
|
|
|
|
// 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.IsEscapingByRef)
|
|
drillIntoBlockVariable(*this, Dst, &D);
|
|
defaultInitNonTrivialCStructVar(Dst);
|
|
return;
|
|
}
|
|
|
|
// 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 =
|
|
Init && emission.IsEscapingByRef && isCapturedBy(D, Init);
|
|
|
|
bool locIsByrefHeader = !capturedByInit;
|
|
const Address Loc =
|
|
locIsByrefHeader ? emission.getObjectAddress(*this) : emission.Addr;
|
|
|
|
// Note: constexpr already initializes everything correctly.
|
|
LangOptions::TrivialAutoVarInitKind trivialAutoVarInit =
|
|
(D.isConstexpr()
|
|
? LangOptions::TrivialAutoVarInitKind::Uninitialized
|
|
: (D.getAttr<UninitializedAttr>()
|
|
? LangOptions::TrivialAutoVarInitKind::Uninitialized
|
|
: getContext().getLangOpts().getTrivialAutoVarInit()));
|
|
|
|
auto initializeWhatIsTechnicallyUninitialized = [&](Address Loc) {
|
|
if (trivialAutoVarInit ==
|
|
LangOptions::TrivialAutoVarInitKind::Uninitialized)
|
|
return;
|
|
|
|
// Only initialize a __block's storage: we always initialize the header.
|
|
if (emission.IsEscapingByRef && !locIsByrefHeader)
|
|
Loc = emitBlockByrefAddress(Loc, &D, /*follow=*/false);
|
|
|
|
return emitZeroOrPatternForAutoVarInit(type, D, Loc);
|
|
};
|
|
|
|
if (isTrivialInitializer(Init))
|
|
return initializeWhatIsTechnicallyUninitialized(Loc);
|
|
|
|
llvm::Constant *constant = nullptr;
|
|
if (emission.IsConstantAggregate ||
|
|
D.mightBeUsableInConstantExpressions(getContext())) {
|
|
assert(!capturedByInit && "constant init contains a capturing block?");
|
|
constant = ConstantEmitter(*this).tryEmitAbstractForInitializer(D);
|
|
if (constant && !constant->isZeroValue() &&
|
|
(trivialAutoVarInit !=
|
|
LangOptions::TrivialAutoVarInitKind::Uninitialized)) {
|
|
IsPattern isPattern =
|
|
(trivialAutoVarInit == LangOptions::TrivialAutoVarInitKind::Pattern)
|
|
? IsPattern::Yes
|
|
: IsPattern::No;
|
|
// C guarantees that brace-init with fewer initializers than members in
|
|
// the aggregate will initialize the rest of the aggregate as-if it were
|
|
// static initialization. In turn static initialization guarantees that
|
|
// padding is initialized to zero bits. We could instead pattern-init if D
|
|
// has any ImplicitValueInitExpr, but that seems to be unintuitive
|
|
// behavior.
|
|
constant = constWithPadding(CGM, IsPattern::No,
|
|
replaceUndef(CGM, isPattern, constant));
|
|
}
|
|
}
|
|
|
|
if (!constant) {
|
|
initializeWhatIsTechnicallyUninitialized(Loc);
|
|
LValue lv = MakeAddrLValue(Loc, type);
|
|
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);
|
|
lv.setNonGC(true);
|
|
return EmitStoreThroughLValue(RValue::get(constant), lv, true);
|
|
}
|
|
|
|
llvm::Type *BP = CGM.Int8Ty->getPointerTo(Loc.getAddressSpace());
|
|
emitStoresForConstant(
|
|
CGM, D, (Loc.getType() == BP) ? Loc : Builder.CreateBitCast(Loc, BP),
|
|
type.isVolatileQualified(), Builder, constant, /*IsAutoInit=*/false);
|
|
}
|
|
|
|
/// 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
|
|
/// its normal location.
|
|
///
|
|
/// \param init the initializing expression
|
|
/// \param D the object to act as if we're initializing
|
|
/// \param lvalue the lvalue to initialize
|
|
/// \param capturedByInit true if \p D 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<VarDecl>(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<VarDecl>(D));
|
|
EmitStoreOfComplex(complex, lvalue, /*init*/ true);
|
|
return;
|
|
}
|
|
case TEK_Aggregate:
|
|
if (type->isAtomicType()) {
|
|
EmitAtomicInit(const_cast<Expr*>(init), lvalue);
|
|
} else {
|
|
AggValueSlot::Overlap_t Overlap = AggValueSlot::MayOverlap;
|
|
if (isa<VarDecl>(D))
|
|
Overlap = AggValueSlot::DoesNotOverlap;
|
|
else if (auto *FD = dyn_cast<FieldDecl>(D))
|
|
Overlap = getOverlapForFieldInit(FD);
|
|
// TODO: how can we delay here if D is captured by its initializer?
|
|
EmitAggExpr(init, AggValueSlot::forLValue(
|
|
lvalue, *this, AggValueSlot::IsDestructed,
|
|
AggValueSlot::DoesNotNeedGCBarriers,
|
|
AggValueSlot::IsNotAliased, Overlap));
|
|
}
|
|
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.
|
|
Address 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<DestroyNRVOVariableCXX>(cleanupKind, addr, type, 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<ObjCPreciseLifetimeAttr>())
|
|
destroyer = CodeGenFunction::destroyARCStrongImprecise;
|
|
break;
|
|
|
|
case QualType::DK_objc_weak_lifetime:
|
|
break;
|
|
|
|
case QualType::DK_nontrivial_c_struct:
|
|
destroyer = CodeGenFunction::destroyNonTrivialCStruct;
|
|
if (emission.NRVOFlag) {
|
|
assert(!type->isArrayType());
|
|
EHStack.pushCleanup<DestroyNRVOVariableC>(cleanupKind, addr,
|
|
emission.NRVOFlag, type);
|
|
return;
|
|
}
|
|
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<DestroyObject>(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;
|
|
|
|
// Check the type for a cleanup.
|
|
if (QualType::DestructionKind dtorKind = D.needsDestruction(getContext()))
|
|
emitAutoVarTypeCleanup(emission, dtorKind);
|
|
|
|
// In GC mode, honor objc_precise_lifetime.
|
|
if (getLangOpts().getGC() != LangOptions::NonGC &&
|
|
D.hasAttr<ObjCPreciseLifetimeAttr>()) {
|
|
EHStack.pushCleanup<ExtendGCLifetime>(NormalCleanup, &D);
|
|
}
|
|
|
|
// Handle the cleanup attribute.
|
|
if (const CleanupAttr *CA = D.getAttr<CleanupAttr>()) {
|
|
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<CallCleanupFunction>(NormalAndEHCleanup, F, &Info, &D);
|
|
}
|
|
|
|
// If this is a block variable, call _Block_object_destroy
|
|
// (on the unforwarded address). Don't enter this cleanup if we're in pure-GC
|
|
// mode.
|
|
if (emission.IsEscapingByRef &&
|
|
CGM.getLangOpts().getGC() != LangOptions::GCOnly) {
|
|
BlockFieldFlags Flags = BLOCK_FIELD_IS_BYREF;
|
|
if (emission.Variable->getType().isObjCGCWeak())
|
|
Flags |= BLOCK_FIELD_IS_WEAK;
|
|
enterByrefCleanup(NormalAndEHCleanup, emission.Addr, Flags,
|
|
/*LoadBlockVarAddr*/ false,
|
|
cxxDestructorCanThrow(emission.Variable->getType()));
|
|
}
|
|
}
|
|
|
|
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;
|
|
case QualType::DK_nontrivial_c_struct:
|
|
return destroyNonTrivialCStruct;
|
|
}
|
|
llvm_unreachable("Unknown DestructionKind");
|
|
}
|
|
|
|
/// pushEHDestroy - Push the standard destructor for the given type as
|
|
/// an EH-only cleanup.
|
|
void CodeGenFunction::pushEHDestroy(QualType::DestructionKind dtorKind,
|
|
Address 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,
|
|
Address 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, Address addr,
|
|
QualType type, Destroyer *destroyer,
|
|
bool useEHCleanupForArray) {
|
|
pushFullExprCleanup<DestroyObject>(cleanupKind, addr, type,
|
|
destroyer, useEHCleanupForArray);
|
|
}
|
|
|
|
void CodeGenFunction::pushStackRestore(CleanupKind Kind, Address SPMem) {
|
|
EHStack.pushCleanup<CallStackRestore>(Kind, SPMem);
|
|
}
|
|
|
|
void CodeGenFunction::pushLifetimeExtendedDestroy(CleanupKind cleanupKind,
|
|
Address addr, QualType type,
|
|
Destroyer *destroyer,
|
|
bool useEHCleanupForArray) {
|
|
// If we're not in a conditional branch, we don't need to bother generating a
|
|
// conditional cleanup.
|
|
if (!isInConditionalBranch()) {
|
|
// 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<DestroyObject>(
|
|
static_cast<CleanupKind>(cleanupKind & ~NormalCleanup), addr, type,
|
|
destroyer, useEHCleanupForArray);
|
|
|
|
return pushCleanupAfterFullExprWithActiveFlag<DestroyObject>(
|
|
cleanupKind, Address::invalid(), addr, type, destroyer, useEHCleanupForArray);
|
|
}
|
|
|
|
// Otherwise, we should only destroy the object if it's been initialized.
|
|
// Re-use the active flag and saved address across both the EH and end of
|
|
// scope cleanups.
|
|
|
|
using SavedType = typename DominatingValue<Address>::saved_type;
|
|
using ConditionalCleanupType =
|
|
EHScopeStack::ConditionalCleanup<DestroyObject, Address, QualType,
|
|
Destroyer *, bool>;
|
|
|
|
Address ActiveFlag = createCleanupActiveFlag();
|
|
SavedType SavedAddr = saveValueInCond(addr);
|
|
|
|
if (cleanupKind & EHCleanup) {
|
|
EHStack.pushCleanup<ConditionalCleanupType>(
|
|
static_cast<CleanupKind>(cleanupKind & ~NormalCleanup), SavedAddr, type,
|
|
destroyer, useEHCleanupForArray);
|
|
initFullExprCleanupWithFlag(ActiveFlag);
|
|
}
|
|
|
|
pushCleanupAfterFullExprWithActiveFlag<ConditionalCleanupType>(
|
|
cleanupKind, ActiveFlag, SavedAddr, 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(Address addr, QualType type,
|
|
Destroyer *destroyer,
|
|
bool useEHCleanupForArray) {
|
|
const ArrayType *arrayType = getContext().getAsArrayType(type);
|
|
if (!arrayType)
|
|
return destroyer(*this, addr, type);
|
|
|
|
llvm::Value *length = emitArrayLength(arrayType, type, addr);
|
|
|
|
CharUnits elementAlign =
|
|
addr.getAlignment()
|
|
.alignmentOfArrayElement(getContext().getTypeSizeInChars(type));
|
|
|
|
// 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<llvm::ConstantInt>(length)) {
|
|
// ...and if it's constant zero, we can just skip the entire thing.
|
|
if (constLength->isZero()) return;
|
|
checkZeroLength = false;
|
|
}
|
|
|
|
llvm::Value *begin = addr.getPointer();
|
|
llvm::Value *end = Builder.CreateInBoundsGEP(begin, length);
|
|
emitArrayDestroy(begin, end, type, elementAlign, 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 elementType - 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 elementType,
|
|
CharUnits elementAlign,
|
|
Destroyer *destroyer,
|
|
bool checkZeroLength,
|
|
bool useEHCleanup) {
|
|
assert(!elementType->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, elementType, elementAlign,
|
|
destroyer);
|
|
|
|
// Perform the actual destruction there.
|
|
destroyer(*this, Address(element, elementAlign), elementType);
|
|
|
|
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, CharUnits elementAlign,
|
|
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<VariableArrayType>(arrayType))
|
|
arrayDepth++;
|
|
type = arrayType->getElementType();
|
|
}
|
|
|
|
if (arrayDepth) {
|
|
llvm::Value *zero = llvm::ConstantInt::get(CGF.SizeTy, 0);
|
|
|
|
SmallVector<llvm::Value*,4> gepIndices(arrayDepth+1, 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, elementAlign, 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 final : public EHScopeStack::Cleanup {
|
|
llvm::Value *ArrayBegin;
|
|
llvm::Value *ArrayEnd;
|
|
QualType ElementType;
|
|
CodeGenFunction::Destroyer *Destroyer;
|
|
CharUnits ElementAlign;
|
|
public:
|
|
RegularPartialArrayDestroy(llvm::Value *arrayBegin, llvm::Value *arrayEnd,
|
|
QualType elementType, CharUnits elementAlign,
|
|
CodeGenFunction::Destroyer *destroyer)
|
|
: ArrayBegin(arrayBegin), ArrayEnd(arrayEnd),
|
|
ElementType(elementType), Destroyer(destroyer),
|
|
ElementAlign(elementAlign) {}
|
|
|
|
void Emit(CodeGenFunction &CGF, Flags flags) override {
|
|
emitPartialArrayDestroy(CGF, ArrayBegin, ArrayEnd,
|
|
ElementType, ElementAlign, 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 final : public EHScopeStack::Cleanup {
|
|
llvm::Value *ArrayBegin;
|
|
Address ArrayEndPointer;
|
|
QualType ElementType;
|
|
CodeGenFunction::Destroyer *Destroyer;
|
|
CharUnits ElementAlign;
|
|
public:
|
|
IrregularPartialArrayDestroy(llvm::Value *arrayBegin,
|
|
Address arrayEndPointer,
|
|
QualType elementType,
|
|
CharUnits elementAlign,
|
|
CodeGenFunction::Destroyer *destroyer)
|
|
: ArrayBegin(arrayBegin), ArrayEndPointer(arrayEndPointer),
|
|
ElementType(elementType), Destroyer(destroyer),
|
|
ElementAlign(elementAlign) {}
|
|
|
|
void Emit(CodeGenFunction &CGF, Flags flags) override {
|
|
llvm::Value *arrayEnd = CGF.Builder.CreateLoad(ArrayEndPointer);
|
|
emitPartialArrayDestroy(CGF, ArrayBegin, arrayEnd,
|
|
ElementType, ElementAlign, Destroyer);
|
|
}
|
|
};
|
|
} // end anonymous namespace
|
|
|
|
/// 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,
|
|
Address arrayEndPointer,
|
|
QualType elementType,
|
|
CharUnits elementAlign,
|
|
Destroyer *destroyer) {
|
|
pushFullExprCleanup<IrregularPartialArrayDestroy>(EHCleanup,
|
|
arrayBegin, arrayEndPointer,
|
|
elementType, elementAlign,
|
|
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,
|
|
CharUnits elementAlign,
|
|
Destroyer *destroyer) {
|
|
pushFullExprCleanup<RegularPartialArrayDestroy>(EHCleanup,
|
|
arrayBegin, arrayEnd,
|
|
elementType, elementAlign,
|
|
destroyer);
|
|
}
|
|
|
|
/// Lazily declare the @llvm.lifetime.start intrinsic.
|
|
llvm::Function *CodeGenModule::getLLVMLifetimeStartFn() {
|
|
if (LifetimeStartFn)
|
|
return LifetimeStartFn;
|
|
LifetimeStartFn = llvm::Intrinsic::getDeclaration(&getModule(),
|
|
llvm::Intrinsic::lifetime_start, AllocaInt8PtrTy);
|
|
return LifetimeStartFn;
|
|
}
|
|
|
|
/// Lazily declare the @llvm.lifetime.end intrinsic.
|
|
llvm::Function *CodeGenModule::getLLVMLifetimeEndFn() {
|
|
if (LifetimeEndFn)
|
|
return LifetimeEndFn;
|
|
LifetimeEndFn = llvm::Intrinsic::getDeclaration(&getModule(),
|
|
llvm::Intrinsic::lifetime_end, AllocaInt8PtrTy);
|
|
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 final : 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);
|
|
}
|
|
};
|
|
} // end anonymous namespace
|
|
|
|
/// Emit an alloca (or GlobalValue depending on target)
|
|
/// for the specified parameter and set up LocalDeclMap.
|
|
void CodeGenFunction::EmitParmDecl(const VarDecl &D, ParamValue Arg,
|
|
unsigned ArgNo) {
|
|
// FIXME: Why isn't ImplicitParamDecl a ParmVarDecl?
|
|
assert((isa<ParmVarDecl>(D) || isa<ImplicitParamDecl>(D)) &&
|
|
"Invalid argument to EmitParmDecl");
|
|
|
|
Arg.getAnyValue()->setName(D.getName());
|
|
|
|
QualType Ty = D.getType();
|
|
|
|
// Use better IR generation for certain implicit parameters.
|
|
if (auto IPD = dyn_cast<ImplicitParamDecl>(&D)) {
|
|
// The only implicit argument a block has is its literal.
|
|
// This may be passed as an inalloca'ed value on Windows x86.
|
|
if (BlockInfo) {
|
|
llvm::Value *V = Arg.isIndirect()
|
|
? Builder.CreateLoad(Arg.getIndirectAddress())
|
|
: Arg.getDirectValue();
|
|
setBlockContextParameter(IPD, ArgNo, V);
|
|
return;
|
|
}
|
|
}
|
|
|
|
Address DeclPtr = Address::invalid();
|
|
bool DoStore = false;
|
|
bool IsScalar = hasScalarEvaluationKind(Ty);
|
|
// If we already have a pointer to the argument, reuse the input pointer.
|
|
if (Arg.isIndirect()) {
|
|
DeclPtr = Arg.getIndirectAddress();
|
|
// If we have a prettier pointer type at this point, bitcast to that.
|
|
unsigned AS = DeclPtr.getType()->getAddressSpace();
|
|
llvm::Type *IRTy = ConvertTypeForMem(Ty)->getPointerTo(AS);
|
|
if (DeclPtr.getType() != IRTy)
|
|
DeclPtr = Builder.CreateBitCast(DeclPtr, IRTy, D.getName());
|
|
// 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());
|
|
}
|
|
|
|
// 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 (hasAggregateEvaluationKind(Ty) && !CurFuncIsThunk &&
|
|
Ty->castAs<RecordType>()->getDecl()->isParamDestroyedInCallee()) {
|
|
if (QualType::DestructionKind DtorKind =
|
|
D.needsDestruction(getContext())) {
|
|
assert((DtorKind == QualType::DK_cxx_destructor ||
|
|
DtorKind == QualType::DK_nontrivial_c_struct) &&
|
|
"unexpected destructor type");
|
|
pushDestroy(DtorKind, DeclPtr, Ty);
|
|
CalleeDestructedParamCleanups[cast<ParmVarDecl>(&D)] =
|
|
EHStack.stable_begin();
|
|
}
|
|
}
|
|
} else {
|
|
// 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");
|
|
}
|
|
DoStore = true;
|
|
}
|
|
|
|
llvm::Value *ArgVal = (DoStore ? Arg.getDirectValue() : nullptr);
|
|
|
|
LValue lv = MakeAddrLValue(DeclPtr, Ty);
|
|
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<NSConsumedAttr>();
|
|
|
|
// If a parameter is pseudo-strong then we can omit the implicit retain.
|
|
if (D.isARCPseudoStrong()) {
|
|
assert(lt == Qualifiers::OCL_Strong &&
|
|
"pseudo-strong variable isn't strong?");
|
|
assert(qs.hasConst() && "pseudo-strong variable should be const!");
|
|
lt = Qualifiers::OCL_ExplicitNone;
|
|
}
|
|
|
|
// Load objects passed indirectly.
|
|
if (Arg.isIndirect() && !ArgVal)
|
|
ArgVal = Builder.CreateLoad(DeclPtr);
|
|
|
|
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(*this), ArgVal, 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.
|
|
ArgVal = EmitARCRetainNonBlock(ArgVal);
|
|
}
|
|
} else {
|
|
// Push the cleanup for a consumed parameter.
|
|
if (isConsumed) {
|
|
ARCPreciseLifetime_t precise = (D.hasAttr<ObjCPreciseLifetimeAttr>()
|
|
? ARCPreciseLifetime : ARCImpreciseLifetime);
|
|
EHStack.pushCleanup<ConsumeARCParameter>(getARCCleanupKind(), ArgVal,
|
|
precise);
|
|
}
|
|
|
|
if (lt == Qualifiers::OCL_Weak) {
|
|
EmitARCInitWeak(DeclPtr, ArgVal);
|
|
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(ArgVal, lv, /* isInitialization */ true);
|
|
|
|
setAddrOfLocalVar(&D, DeclPtr);
|
|
|
|
// Emit debug info for param declarations in non-thunk functions.
|
|
if (CGDebugInfo *DI = getDebugInfo()) {
|
|
if (CGM.getCodeGenOpts().hasReducedDebugInfo() && !CurFuncIsThunk) {
|
|
DI->EmitDeclareOfArgVariable(&D, DeclPtr.getPointer(), ArgNo, Builder);
|
|
}
|
|
}
|
|
|
|
if (D.hasAttr<AnnotateAttr>())
|
|
EmitVarAnnotations(&D, DeclPtr.getPointer());
|
|
|
|
// 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()));
|
|
}
|
|
}
|
|
}
|
|
|
|
void CodeGenModule::EmitOMPDeclareReduction(const OMPDeclareReductionDecl *D,
|
|
CodeGenFunction *CGF) {
|
|
if (!LangOpts.OpenMP || (!LangOpts.EmitAllDecls && !D->isUsed()))
|
|
return;
|
|
getOpenMPRuntime().emitUserDefinedReduction(CGF, D);
|
|
}
|
|
|
|
void CodeGenModule::EmitOMPDeclareMapper(const OMPDeclareMapperDecl *D,
|
|
CodeGenFunction *CGF) {
|
|
if (!LangOpts.OpenMP || LangOpts.OpenMPSimd ||
|
|
(!LangOpts.EmitAllDecls && !D->isUsed()))
|
|
return;
|
|
getOpenMPRuntime().emitUserDefinedMapper(D, CGF);
|
|
}
|
|
|
|
void CodeGenModule::EmitOMPRequiresDecl(const OMPRequiresDecl *D) {
|
|
getOpenMPRuntime().processRequiresDirective(D);
|
|
}
|