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clang
5.0.0
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#include "CGBlocks.h"#include "CGDebugInfo.h"#include "CGObjCRuntime.h"#include "CodeGenFunction.h"#include "CodeGenModule.h"#include "clang/CodeGen/ConstantInitBuilder.h"#include "clang/AST/DeclObjC.h"#include "llvm/ADT/SmallSet.h"#include "llvm/IR/CallSite.h"#include "llvm/IR/DataLayout.h"#include "llvm/IR/Module.h"#include <algorithm>#include <cstdio>Go to the source code of this file.
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| enum | BlockCaptureEntityKind |
| Represents a type of copy/destroy operation that should be performed for an entity that's captured by a block. More... | |
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| static llvm::Constant * | buildGlobalBlock (CodeGenModule &CGM, const CGBlockInfo &blockInfo, llvm::Constant *blockFn) |
| Build the given block as a global block. More... | |
| static llvm::Constant * | buildCopyHelper (CodeGenModule &CGM, const CGBlockInfo &blockInfo) |
| Build the helper function to copy a block. More... | |
| static llvm::Constant * | buildDisposeHelper (CodeGenModule &CGM, const CGBlockInfo &blockInfo) |
| Build the helper function to dispose of a block. More... | |
| static llvm::Constant * | buildBlockDescriptor (CodeGenModule &CGM, const CGBlockInfo &blockInfo) |
| buildBlockDescriptor - Build the block descriptor meta-data for a block. More... | |
| static bool | isSafeForCXXConstantCapture (QualType type) |
| Determines if the given type is safe for constant capture in C++. More... | |
| static llvm::Constant * | tryCaptureAsConstant (CodeGenModule &CGM, CodeGenFunction *CGF, const VarDecl *var) |
| It is illegal to modify a const object after initialization. More... | |
| static CharUnits | getLowBit (CharUnits v) |
| Get the low bit of a nonzero character count. More... | |
| static void | initializeForBlockHeader (CodeGenModule &CGM, CGBlockInfo &info, SmallVectorImpl< llvm::Type * > &elementTypes) |
| static QualType | getCaptureFieldType (const CodeGenFunction &CGF, const BlockDecl::Capture &CI) |
| static void | computeBlockInfo (CodeGenModule &CGM, CodeGenFunction *CGF, CGBlockInfo &info) |
| Compute the layout of the given block. More... | |
| static void | enterBlockScope (CodeGenFunction &CGF, BlockDecl *block) |
| Enter the scope of a block. More... | |
| static CGBlockInfo * | findAndRemoveBlockInfo (CGBlockInfo **head, const BlockDecl *block) |
| Find the layout for the given block in a linked list and remove it. More... | |
| static std::pair < BlockCaptureEntityKind, BlockFieldFlags > | computeCopyInfoForBlockCapture (const BlockDecl::Capture &CI, QualType T, const LangOptions &LangOpts) |
| static void | findBlockCapturedManagedEntities (const CGBlockInfo &BlockInfo, const LangOptions &LangOpts, SmallVectorImpl< BlockCaptureManagedEntity > &ManagedCaptures, llvm::function_ref< std::pair< BlockCaptureEntityKind, BlockFieldFlags >(const BlockDecl::Capture &, QualType, const LangOptions &)> Predicate) |
| Find the set of block captures that need to be explicitly copied or destroy. More... | |
| static std::pair < BlockCaptureEntityKind, BlockFieldFlags > | computeDestroyInfoForBlockCapture (const BlockDecl::Capture &CI, QualType T, const LangOptions &LangOpts) |
| static llvm::Constant * | generateByrefCopyHelper (CodeGenFunction &CGF, const BlockByrefInfo &byrefInfo, BlockByrefHelpers &generator) |
| static llvm::Constant * | buildByrefCopyHelper (CodeGenModule &CGM, const BlockByrefInfo &byrefInfo, BlockByrefHelpers &generator) |
| Build the copy helper for a __block variable. More... | |
| static llvm::Constant * | generateByrefDisposeHelper (CodeGenFunction &CGF, const BlockByrefInfo &byrefInfo, BlockByrefHelpers &generator) |
| Generate code for a __block variable's dispose helper. More... | |
| static llvm::Constant * | buildByrefDisposeHelper (CodeGenModule &CGM, const BlockByrefInfo &byrefInfo, BlockByrefHelpers &generator) |
| Build the dispose helper for a __block variable. More... | |
| template<class T > | |
| static T * | buildByrefHelpers (CodeGenModule &CGM, const BlockByrefInfo &byrefInfo, T &&generator) |
| Lazily build the copy and dispose helpers for a __block variable with the given information. More... | |
| static void | configureBlocksRuntimeObject (CodeGenModule &CGM, llvm::Constant *C) |
| Adjust the declaration of something from the blocks API. More... | |
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Represents a type of copy/destroy operation that should be performed for an entity that's captured by a block.
Definition at line 1395 of file CGBlocks.cpp.
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buildBlockDescriptor - Build the block descriptor meta-data for a block.
buildBlockDescriptor is accessed from 5th field of the Block_literal meta-data and contains stationary information about the block literal. Its definition will have 4 (or optinally 6) words.
Definition at line 77 of file CGBlocks.cpp.
References clang::CodeGen::ConstantInitBuilderTemplateBase< Traits >::beginStruct(), clang::CodeGen::CGBlockInfo::BlockSize, buildCopyHelper(), buildDisposeHelper(), clang::CodeGen::CGObjCRuntime::BuildGCBlockLayout(), clang::CodeGen::CGObjCRuntime::BuildRCBlockLayout(), clang::CodeGen::CodeGenTypes::ConvertType(), clang::CodeGen::CodeGenModule::GetAddrOfConstantCString(), clang::CodeGen::CodeGenModule::getBlockDescriptorType(), clang::CodeGen::CGBlockInfo::getBlockExpr(), clang::CodeGen::CodeGenModule::getContext(), clang::CodeGen::CodeGenModule::getLangOpts(), clang::ASTContext::getLangOpts(), clang::CodeGen::CodeGenModule::getLLVMContext(), clang::ASTContext::getObjCEncodingForBlock(), clang::CodeGen::CodeGenModule::getObjCRuntime(), clang::CodeGen::ConstantAddress::getPointer(), clang::CodeGen::CodeGenTypeCache::getPointerAlign(), clang::CharUnits::getQuantity(), clang::ASTContext::getTargetAddressSpace(), clang::CodeGen::CodeGenModule::getTypes(), clang::InternalLinkage, clang::CodeGen::CGBlockInfo::NeedsCopyDispose, clang::LangOptions::NonGC, clang::LangAS::opencl_constant, clang::ASTContext::UnsignedLongTy, and clang::CodeGen::CodeGenTypeCache::VoidPtrTy.
Referenced by buildGlobalBlock().
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Build the copy helper for a __block variable.
Definition at line 1981 of file CGBlocks.cpp.
References generateByrefCopyHelper().
Referenced by buildByrefHelpers().
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Build the dispose helper for a __block variable.
Definition at line 2043 of file CGBlocks.cpp.
References generateByrefDisposeHelper().
Referenced by buildByrefHelpers().
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Lazily build the copy and dispose helpers for a __block variable with the given information.
Definition at line 2053 of file CGBlocks.cpp.
References buildByrefCopyHelper(), buildByrefDisposeHelper(), clang::CodeGen::CodeGenModule::ByrefHelpersCache, clang::CodeGen::CodeGenModule::getContext(), and clang::ast_matchers::id().
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Build the helper function to copy a block.
Definition at line 52 of file CGBlocks.cpp.
References clang::CodeGen::CodeGenFunction::GenerateCopyHelperFunction().
Referenced by buildBlockDescriptor().
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Build the helper function to dispose of a block.
Definition at line 58 of file CGBlocks.cpp.
References clang::CodeGen::CodeGenFunction::GenerateDestroyHelperFunction().
Referenced by buildBlockDescriptor().
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Build the given block as a global block.
Definition at line 1129 of file CGBlocks.cpp.
References clang::CodeGen::BLOCK_HAS_SIGNATURE, clang::CodeGen::BLOCK_IS_GLOBAL, clang::CodeGen::BLOCK_USE_STRET, clang::CodeGen::CGBlockInfo::BlockAlign, clang::CodeGen::CGBlockInfo::BlockExpression, buildBlockDescriptor(), clang::CodeGen::CGBlockInfo::CanBeGlobal, clang::CodeGen::CodeGenTypes::ConvertType(), clang::CodeGen::CodeGenModule::getAddrOfGlobalBlockIfEmitted(), clang::CodeGen::BlockFlags::getBitMask(), clang::CodeGen::CGBlockInfo::getBlockExpr(), clang::CodeGen::CodeGenModule::getContext(), clang::ASTContext::getLangOpts(), clang::CodeGen::CodeGenModule::getNSConcreteGlobalBlock(), clang::CodeGen::CodeGenModule::getNullPointer(), clang::ASTContext::getPointerType(), clang::ASTContext::getTargetAddressSpace(), clang::Expr::getType(), clang::CodeGen::CodeGenModule::getTypes(), clang::InternalLinkage, clang::CodeGen::CodeGenTypeCache::IntTy, clang::LangAS::opencl_global, Result, clang::CodeGen::CodeGenModule::setAddrOfGlobalBlock(), clang::CodeGen::Type, clang::CodeGen::CGBlockInfo::UsesStret, clang::CodeGen::CodeGenTypeCache::VoidPtrPtrTy, and clang::ASTContext::VoidPtrTy.
Referenced by clang::CodeGen::CodeGenModule::GetAddrOfGlobalBlock().
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Compute the layout of the given block.
Attempts to lay the block out with minimal space requirements.
Definition at line 336 of file CGBlocks.cpp.
References clang::CharUnits::alignTo(), clang::CodeGen::CGBlockInfo::BlockAlign, clang::CodeGen::CGBlockInfo::BlockHeaderForcedGapOffset, clang::CodeGen::CGBlockInfo::BlockHeaderForcedGapSize, clang::CodeGen::CGBlockInfo::BlockSize, clang::CodeGen::CGBlockInfo::CanBeGlobal, clang::BlockDecl::capture_begin(), clang::BlockDecl::capture_end(), clang::CodeGen::CGBlockInfo::Captures, clang::BlockDecl::captures(), clang::BlockDecl::capturesCXXThis(), clang::CodeGen::CodeGenTypes::ConvertType(), clang::CodeGen::CodeGenTypes::ConvertTypeForMem(), clang::CodeGen::CodeGenFunction::CurFuncDecl, clang::Type::getAsCXXRecordDecl(), clang::CodeGen::CGBlockInfo::getBlockDecl(), getCaptureFieldType(), clang::CodeGen::CodeGenModule::getContext(), clang::ASTContext::getDeclAlign(), clang::CodeGen::CodeGenModule::getLangOpts(), clang::ASTContext::getLangOpts(), clang::CodeGen::CodeGenModule::getLLVMContext(), getLowBit(), clang::QualType::getObjCLifetime(), clang::CodeGen::CodeGenTypeCache::getPointerAlign(), clang::CodeGen::CodeGenTypeCache::getPointerSize(), clang::CharUnits::getQuantity(), clang::ValueDecl::getType(), clang::ASTContext::getTypeInfoInChars(), clang::CodeGen::CodeGenModule::getTypes(), clang::ASTContext::getTypeSizeInChars(), clang::CodeGen::CGBlockInfo::HasCapturedVariableLayout, clang::BlockDecl::hasCaptures(), clang::CodeGen::CGBlockInfo::HasCXXObject, initializeForBlockHeader(), clang::CodeGen::CodeGenTypeCache::Int8Ty, clang::Type::isObjCInertUnsafeUnretainedType(), clang::Type::isObjCRetainableType(), clang::CodeGen::CGBlockInfo::Capture::makeConstant(), max(), clang::CodeGen::CGBlockInfo::NeedsCopyDispose, clang::LangOptions::NonGC, clang::Qualifiers::OCL_Autoreleasing, clang::Qualifiers::OCL_ExplicitNone, clang::Qualifiers::OCL_None, clang::Qualifiers::OCL_Strong, clang::Qualifiers::OCL_Weak, clang::CodeGen::CGBlockInfo::StructureType, tryCaptureAsConstant(), clang::CodeGen::Type, clang::CodeGen::CodeGenTypeCache::VoidPtrTy, and clang::CharUnits::Zero().
Referenced by clang::CodeGen::CodeGenFunction::EmitBlockLiteral(), enterBlockScope(), and clang::CodeGen::CodeGenModule::GetAddrOfGlobalBlock().
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Definition at line 1420 of file CGBlocks.cpp.
References clang::CodeGen::BLOCK_FIELD_IS_BLOCK, clang::CodeGen::BLOCK_FIELD_IS_BYREF, clang::CodeGen::BLOCK_FIELD_IS_OBJECT, clang::CodeGen::BLOCK_FIELD_IS_WEAK, clang::BlockDecl::Capture::getCopyExpr(), clang::Qualifiers::getObjCLifetime(), clang::QualType::getQualifiers(), isBlockPointer(), clang::Type::isBlockPointerType(), clang::BlockDecl::Capture::isByRef(), clang::QualType::isObjCGCWeak(), clang::Type::isObjCRetainableType(), clang::None, clang::Qualifiers::OCL_Strong, and clang::Qualifiers::OCL_Weak.
Referenced by clang::CodeGen::CodeGenFunction::GenerateCopyHelperFunction().
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Definition at line 1621 of file CGBlocks.cpp.
References clang::CodeGen::BLOCK_FIELD_IS_BLOCK, clang::CodeGen::BLOCK_FIELD_IS_BYREF, clang::CodeGen::BLOCK_FIELD_IS_OBJECT, clang::CodeGen::BLOCK_FIELD_IS_WEAK, clang::Type::getAsCXXRecordDecl(), clang::Qualifiers::getObjCLifetime(), clang::QualType::getQualifiers(), clang::Qualifiers::hasObjCLifetime(), clang::Type::isBlockPointerType(), clang::BlockDecl::Capture::isByRef(), clang::QualType::isObjCGCWeak(), clang::Type::isObjCRetainableType(), clang::None, clang::Qualifiers::OCL_Strong, and clang::Qualifiers::OCL_Weak.
Referenced by clang::CodeGen::CodeGenFunction::GenerateDestroyHelperFunction().
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Adjust the declaration of something from the blocks API.
Definition at line 2420 of file CGBlocks.cpp.
References clang::TranslationUnitDecl::castToDeclContext(), clang::ExternalLinkage, clang::IdentifierTable::get(), clang::CodeGen::CodeGenModule::getContext(), clang::CodeGen::CodeGenModule::getLangOpts(), clang::CodeGen::CodeGenModule::getTarget(), clang::ASTContext::getTranslationUnitDecl(), clang::TargetInfo::getTriple(), clang::ASTContext::Idents, clang::DeclContext::lookup(), and Result.
Referenced by clang::CodeGen::CodeGenModule::getBlockObjectAssign(), clang::CodeGen::CodeGenModule::getBlockObjectDispose(), clang::CodeGen::CodeGenModule::getNSConcreteGlobalBlock(), and clang::CodeGen::CodeGenModule::getNSConcreteStackBlock().
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Enter the scope of a block.
This should be run at the entrance to a full-expression so that the block's cleanups are pushed at the right place in the stack.
Definition at line 578 of file CGBlocks.cpp.
References clang::CodeGen::CodeGenFunction::Builder, clang::BlockDecl::captures(), clang::CodeGen::CodeGenFunction::CGM, computeBlockInfo(), clang::CodeGen::CGBuilderTy::CreateStructGEP(), clang::CodeGen::CodeGenFunction::CreateTempAlloca(), clang::CodeGen::CodeGenFunction::CurFn, clang::CodeGen::CodeGenFunction::destroyARCStrongImprecise, clang::QualType::DK_none, clang::QualType::DK_objc_strong_lifetime, clang::CodeGen::CodeGenFunction::EHStack, clang::CodeGen::CodeGenFunction::emitARCIntrinsicUse, clang::CodeGen::CodeGenFunction::FirstBlockInfo, getCaptureFieldType(), clang::CodeGen::CodeGenModule::getCodeGenOpts(), clang::CodeGen::CodeGenFunction::getDestroyer(), clang::CodeGen::CGBlockInfo::Capture::getIndex(), clang::CodeGen::CodeGenModule::getLangOpts(), clang::QualType::getObjCLifetime(), clang::CodeGen::CGBlockInfo::Capture::getOffset(), clang::CodeGen::Address::getPointer(), clang::CodeGen::CodeGenFunction::HaveInsertPoint(), clang::CodeGen::InactiveNormalAndEHCleanup, clang::CodeGen::InactiveNormalCleanup, clang::CodeGen::CGBlockInfo::Capture::isConstant(), clang::QualType::isConstQualified(), clang::QualType::isDestructedType(), clang::CodeGen::CodeGenFunction::needsEHCleanup(), clang::CodeGen::CGBlockInfo::NextBlockInfo, clang::Qualifiers::OCL_Strong, clang::CodeGen::CodeGenFunction::pushDestroy(), clang::CodeGen::CGBlockInfo::Capture::setCleanup(), and clang::CodeGen::EHScopeStack::stable_begin().
Referenced by clang::CodeGen::CodeGenFunction::enterNonTrivialFullExpression().
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Find the layout for the given block in a linked list and remove it.
Definition at line 673 of file CGBlocks.cpp.
References clang::CodeGen::CGBlockInfo::getBlockDecl(), and clang::CodeGen::CGBlockInfo::NextBlockInfo.
Referenced by clang::CodeGen::CodeGenFunction::EmitBlockLiteral().
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Find the set of block captures that need to be explicitly copied or destroy.
Definition at line 1470 of file CGBlocks.cpp.
References clang::BlockDecl::captures(), clang::CodeGen::CGBlockInfo::getBlockDecl(), clang::CodeGen::CGBlockInfo::getCapture(), clang::ValueDecl::getType(), clang::CodeGen::CGBlockInfo::Capture::isConstant(), and clang::None.
Referenced by clang::CodeGen::CodeGenFunction::GenerateCopyHelperFunction(), and clang::CodeGen::CodeGenFunction::GenerateDestroyHelperFunction().
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Definition at line 1913 of file CGBlocks.cpp.
References clang::CodeGen::CodeGenTypes::arrangeBuiltinFunctionDeclaration(), clang::CodeGen::CodeGenFunction::Builder, clang::CodeGen::BlockByrefInfo::ByrefAlignment, clang::CodeGen::CodeGenFunction::CGM, Context, clang::FunctionDecl::Create(), clang::Create(), clang::CodeGen::CGBuilderTy::CreateBitCast(), clang::CodeGen::CGBuilderTy::CreateLoad(), clang::CodeGen::CodeGenFunction::emitBlockByrefAddress(), clang::CodeGen::BlockByrefHelpers::emitCopy(), clang::CodeGen::CodeGenFunction::FinishFunction(), clang::IdentifierTable::get(), clang::CodeGen::CodeGenFunction::GetAddrOfLocalVar(), clang::CodeGen::CodeGenFunction::getContext(), clang::CodeGen::CodeGenTypes::GetFunctionType(), clang::CodeGen::CodeGenModule::getModule(), clang::ASTContext::getTranslationUnitDecl(), clang::CodeGen::CodeGenModule::getTypes(), clang::ASTContext::Idents, clang::CodeGen::CodeGenTypeCache::Int8PtrTy, clang::InternalLinkage, clang::CodeGen::BlockByrefHelpers::needsCopy(), clang::ImplicitParamDecl::Other, clang::SC_Static, clang::CodeGen::CodeGenModule::SetInternalFunctionAttributes(), clang::CodeGen::CodeGenFunction::StartFunction(), clang::CodeGen::Type, clang::CodeGen::BlockByrefInfo::Type, clang::ASTContext::VoidPtrTy, and clang::ASTContext::VoidTy.
Referenced by buildByrefCopyHelper().
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Generate code for a __block variable's dispose helper.
Definition at line 1990 of file CGBlocks.cpp.
References clang::CodeGen::CodeGenTypes::arrangeBuiltinFunctionDeclaration(), clang::CodeGen::CodeGenFunction::Builder, clang::CodeGen::BlockByrefInfo::ByrefAlignment, clang::CodeGen::CodeGenFunction::CGM, Context, clang::FunctionDecl::Create(), clang::Create(), clang::CodeGen::CGBuilderTy::CreateBitCast(), clang::CodeGen::CGBuilderTy::CreateLoad(), clang::CodeGen::CodeGenFunction::emitBlockByrefAddress(), clang::CodeGen::BlockByrefHelpers::emitDispose(), clang::CodeGen::CodeGenFunction::FinishFunction(), clang::IdentifierTable::get(), clang::CodeGen::CodeGenFunction::GetAddrOfLocalVar(), clang::CodeGen::CodeGenFunction::getContext(), clang::CodeGen::CodeGenTypes::GetFunctionType(), clang::CodeGen::CodeGenModule::getModule(), clang::ASTContext::getTranslationUnitDecl(), clang::CodeGen::CodeGenModule::getTypes(), clang::ASTContext::Idents, clang::CodeGen::CodeGenTypeCache::Int8PtrTy, clang::InternalLinkage, clang::CodeGen::BlockByrefHelpers::needsDispose(), clang::ImplicitParamDecl::Other, clang::SC_Static, clang::CodeGen::CodeGenModule::SetInternalFunctionAttributes(), clang::CodeGen::CodeGenFunction::StartFunction(), clang::CodeGen::BlockByrefInfo::Type, clang::ASTContext::VoidPtrTy, and clang::ASTContext::VoidTy.
Referenced by buildByrefDisposeHelper().
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Definition at line 321 of file CGBlocks.cpp.
References clang::CodeGen::CodeGenFunction::BlockInfo, clang::CodeGen::CGBlockInfo::Capture::fieldType(), clang::CodeGen::CGBlockInfo::getCapture(), clang::ValueDecl::getType(), clang::BlockDecl::Capture::getVariable(), clang::BlockDecl::Capture::isNested(), and clang::CodeGen::CodeGenFunction::LambdaCaptureFields.
Referenced by computeBlockInfo(), and enterBlockScope().
Get the low bit of a nonzero character count.
This is the alignment of the nth byte if the 0th byte is universally aligned.
Definition at line 298 of file CGBlocks.cpp.
References clang::CharUnits::fromQuantity(), and clang::CharUnits::getQuantity().
Referenced by computeBlockInfo().
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Definition at line 302 of file CGBlocks.cpp.
References clang::CodeGen::CGBlockInfo::BlockAlign, clang::CodeGen::CGBlockInfo::BlockSize, clang::CodeGen::CodeGenModule::getBlockDescriptorType(), clang::CodeGen::CodeGenTypeCache::getIntAlign(), clang::CodeGen::CodeGenTypeCache::getIntSize(), clang::CodeGen::CodeGenTypeCache::getPointerAlign(), clang::CodeGen::CodeGenTypeCache::getPointerSize(), clang::CodeGen::CodeGenTypeCache::IntTy, and clang::CodeGen::CodeGenTypeCache::VoidPtrTy.
Referenced by computeBlockInfo().
Determines if the given type is safe for constant capture in C++.
Definition at line 242 of file CGBlocks.cpp.
References clang::Type::getAs(), clang::Type::getBaseElementTypeUnsafe(), and clang::RecordType::getDecl().
Referenced by tryCaptureAsConstant().
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It is illegal to modify a const object after initialization.
Therefore, if a const object has a constant initializer, we don't actually need to keep storage for it in the block; we'll just rematerialize it at the start of the block function. This is acceptable because we make no promises about address stability of captured variables.
Definition at line 266 of file CGBlocks.cpp.
References clang::CodeGen::CodeGenModule::EmitConstantInit(), clang::VarDecl::getInit(), clang::CodeGen::CodeGenModule::getLangOpts(), clang::ValueDecl::getType(), clang::QualType::isConstQualified(), isSafeForCXXConstantCapture(), and clang::ast_matchers::type.
Referenced by computeBlockInfo().
1.8.6