clang
3.9.0
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#include "CGBlocks.h"
#include "CGDebugInfo.h"
#include "CGObjCRuntime.h"
#include "CodeGenFunction.h"
#include "CodeGenModule.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.
Functions | |
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 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 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... | |
Variables | |
const unsigned | BlockHeaderSize = 5 |
The number of fields in a block header. More... | |
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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 76 of file CGBlocks.cpp.
References 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::CodeGen::CodeGenModule::getModule(), clang::ASTContext::getObjCEncodingForBlock(), clang::CodeGen::CodeGenModule::getObjCRuntime(), clang::CodeGen::ConstantAddress::getPointer(), clang::CharUnits::getQuantity(), clang::ASTContext::getTargetAddressSpace(), clang::CodeGen::CodeGenModule::getTypes(), clang::InternalLinkage, clang::CodeGen::CGBlockInfo::NeedsCopyDispose, clang::LangOptions::NonGC, clang::LangAS::opencl_constant, clang::CodeGen::Type, clang::ASTContext::UnsignedLongTy, and clang::ASTContext::VoidPtrTy.
Referenced by buildGlobalBlock(), and clang::CodeGen::CodeGenFunction::EmitBlockLiteral().
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Build the copy helper for a __block variable.
Definition at line 1857 of file CGBlocks.cpp.
References generateByrefCopyHelper().
Referenced by buildByrefHelpers().
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Build the dispose helper for a __block variable.
Definition at line 1919 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 1929 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 51 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 57 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 1066 of file CGBlocks.cpp.
References clang::CodeGen::BLOCK_HAS_SIGNATURE, clang::CodeGen::BLOCK_IS_GLOBAL, clang::CodeGen::BLOCK_USE_STRET, clang::CodeGen::CGBlockInfo::BlockAlign, BlockHeaderSize, buildBlockDescriptor(), clang::CodeGen::CGBlockInfo::CanBeGlobal, clang::CodeGen::CodeGenTypes::ConvertType(), clang::CodeGen::BlockFlags::getBitMask(), clang::CodeGen::CGBlockInfo::getBlockExpr(), clang::CodeGen::CodeGenModule::getModule(), clang::CodeGen::CodeGenModule::getNSConcreteGlobalBlock(), clang::CharUnits::getQuantity(), clang::Expr::getType(), clang::CodeGen::CodeGenModule::getTypes(), clang::InternalLinkage, clang::CodeGen::CodeGenTypeCache::IntTy, clang::CodeGen::Type, and clang::CodeGen::CGBlockInfo::UsesStret.
Referenced by clang::CodeGen::CodeGenFunction::EmitBlockLiteral(), and 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 326 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(), 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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Adjust the declaration of something from the blocks API.
Definition at line 2296 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 clang::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 567 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::FirstBlockInfo, clang::CodeGen::CodeGenFunction::getDestroyer(), clang::CodeGen::CGBlockInfo::Capture::getIndex(), clang::CodeGen::CGBlockInfo::Capture::getOffset(), clang::CodeGen::Address::getPointer(), clang::ValueDecl::getType(), clang::CodeGen::CodeGenFunction::HaveInsertPoint(), clang::CodeGen::InactiveNormalAndEHCleanup, clang::CodeGen::InactiveNormalCleanup, clang::CodeGen::CGBlockInfo::Capture::isConstant(), clang::QualType::isDestructedType(), clang::CodeGen::CodeGenFunction::needsEHCleanup(), clang::CodeGen::CGBlockInfo::NextBlockInfo, 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 652 of file CGBlocks.cpp.
References clang::CodeGen::CGBlockInfo::getBlockDecl(), and clang::CodeGen::CGBlockInfo::NextBlockInfo.
Referenced by clang::CodeGen::CodeGenFunction::EmitBlockLiteral().
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Definition at line 1789 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::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 1866 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::SC_Static, clang::CodeGen::CodeGenModule::SetInternalFunctionAttributes(), clang::CodeGen::CodeGenFunction::StartFunction(), clang::CodeGen::BlockByrefInfo::Type, clang::ASTContext::VoidPtrTy, and clang::ASTContext::VoidTy.
Referenced by buildByrefDisposeHelper().
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 299 of file CGBlocks.cpp.
References clang::CharUnits::fromQuantity(), and clang::CharUnits::getQuantity().
Referenced by computeBlockInfo().
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Definition at line 303 of file CGBlocks.cpp.
References clang::CodeGen::CGBlockInfo::BlockAlign, BlockHeaderSize, 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 243 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 267 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().
const unsigned BlockHeaderSize = 5 |
The number of fields in a block header.
Definition at line 192 of file CGBlocks.cpp.
Referenced by buildGlobalBlock(), and initializeForBlockHeader().