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Diffstat (limited to 'lib/CodeGen/CGBlocks.cpp')
| -rw-r--r-- | lib/CodeGen/CGBlocks.cpp | 1037 |
1 files changed, 1037 insertions, 0 deletions
diff --git a/lib/CodeGen/CGBlocks.cpp b/lib/CodeGen/CGBlocks.cpp new file mode 100644 index 0000000..ead689c --- /dev/null +++ b/lib/CodeGen/CGBlocks.cpp @@ -0,0 +1,1037 @@ +//===--- CGBlocks.cpp - Emit LLVM Code for declarations -------------------===// +// +// The LLVM Compiler Infrastructure +// +// This file is distributed under the University of Illinois Open Source +// License. See LICENSE.TXT for details. +// +//===----------------------------------------------------------------------===// +// +// This contains code to emit blocks. +// +//===----------------------------------------------------------------------===// + +#include "CodeGenFunction.h" +#include "CodeGenModule.h" +#include "clang/AST/DeclObjC.h" +#include "llvm/Module.h" +#include "llvm/Target/TargetData.h" +#include <algorithm> +using namespace clang; +using namespace CodeGen; + +llvm::Constant *CodeGenFunction:: +BuildDescriptorBlockDecl(bool BlockHasCopyDispose, uint64_t Size, + const llvm::StructType* Ty, + std::vector<HelperInfo> *NoteForHelper) { + const llvm::Type *UnsignedLongTy + = CGM.getTypes().ConvertType(getContext().UnsignedLongTy); + llvm::Constant *C; + std::vector<llvm::Constant*> Elts; + + // reserved + C = llvm::ConstantInt::get(UnsignedLongTy, 0); + Elts.push_back(C); + + // Size + // FIXME: What is the right way to say this doesn't fit? We should give + // a user diagnostic in that case. Better fix would be to change the + // API to size_t. + C = llvm::ConstantInt::get(UnsignedLongTy, Size); + Elts.push_back(C); + + if (BlockHasCopyDispose) { + // copy_func_helper_decl + Elts.push_back(BuildCopyHelper(Ty, NoteForHelper)); + + // destroy_func_decl + Elts.push_back(BuildDestroyHelper(Ty, NoteForHelper)); + } + + C = llvm::ConstantStruct::get(Elts); + + C = new llvm::GlobalVariable(C->getType(), true, + llvm::GlobalValue::InternalLinkage, + C, "__block_descriptor_tmp", &CGM.getModule()); + return C; +} + +llvm::Constant *BlockModule::getNSConcreteGlobalBlock() { + if (NSConcreteGlobalBlock == 0) + NSConcreteGlobalBlock = CGM.CreateRuntimeVariable(PtrToInt8Ty, + "_NSConcreteGlobalBlock"); + return NSConcreteGlobalBlock; +} + +llvm::Constant *BlockModule::getNSConcreteStackBlock() { + if (NSConcreteStackBlock == 0) + NSConcreteStackBlock = CGM.CreateRuntimeVariable(PtrToInt8Ty, + "_NSConcreteStackBlock"); + return NSConcreteStackBlock; +} + +static void CollectBlockDeclRefInfo(const Stmt *S, + CodeGenFunction::BlockInfo &Info) { + for (Stmt::const_child_iterator I = S->child_begin(), E = S->child_end(); + I != E; ++I) + if (*I) + CollectBlockDeclRefInfo(*I, Info); + + if (const BlockDeclRefExpr *DE = dyn_cast<BlockDeclRefExpr>(S)) { + // FIXME: Handle enums. + if (isa<FunctionDecl>(DE->getDecl())) + return; + + if (DE->isByRef()) + Info.ByRefDeclRefs.push_back(DE); + else + Info.ByCopyDeclRefs.push_back(DE); + } +} + +/// CanBlockBeGlobal - Given a BlockInfo struct, determines if a block can be +/// declared as a global variable instead of on the stack. +static bool CanBlockBeGlobal(const CodeGenFunction::BlockInfo &Info) { + return Info.ByRefDeclRefs.empty() && Info.ByCopyDeclRefs.empty(); +} + +// FIXME: Push most into CGM, passing down a few bits, like current function +// name. +llvm::Value *CodeGenFunction::BuildBlockLiteralTmp(const BlockExpr *BE) { + + std::string Name = CurFn->getName(); + CodeGenFunction::BlockInfo Info(0, Name.c_str()); + CollectBlockDeclRefInfo(BE->getBody(), Info); + + // Check if the block can be global. + // FIXME: This test doesn't work for nested blocks yet. Longer term, I'd like + // to just have one code path. We should move this function into CGM and pass + // CGF, then we can just check to see if CGF is 0. + if (0 && CanBlockBeGlobal(Info)) + return CGM.GetAddrOfGlobalBlock(BE, Name.c_str()); + + std::vector<llvm::Constant*> Elts(5); + llvm::Constant *C; + llvm::Value *V; + + { + // C = BuildBlockStructInitlist(); + unsigned int flags = BLOCK_HAS_DESCRIPTOR; + + // We run this first so that we set BlockHasCopyDispose from the entire + // block literal. + // __invoke + uint64_t subBlockSize, subBlockAlign; + llvm::SmallVector<const Expr *, 8> subBlockDeclRefDecls; + bool subBlockHasCopyDispose = false; + llvm::Function *Fn + = CodeGenFunction(CGM).GenerateBlockFunction(BE, Info, CurFuncDecl, LocalDeclMap, + subBlockSize, + subBlockAlign, + subBlockDeclRefDecls, + subBlockHasCopyDispose); + BlockHasCopyDispose |= subBlockHasCopyDispose; + Elts[3] = Fn; + + // FIXME: Don't use BlockHasCopyDispose, it is set more often then + // necessary, for example: { ^{ __block int i; ^{ i = 1; }(); }(); } + if (subBlockHasCopyDispose) + flags |= BLOCK_HAS_COPY_DISPOSE; + + // __isa + C = CGM.getNSConcreteStackBlock(); + C = llvm::ConstantExpr::getBitCast(C, PtrToInt8Ty); + Elts[0] = C; + + // __flags + const llvm::IntegerType *IntTy = cast<llvm::IntegerType>( + CGM.getTypes().ConvertType(CGM.getContext().IntTy)); + C = llvm::ConstantInt::get(IntTy, flags); + Elts[1] = C; + + // __reserved + C = llvm::ConstantInt::get(IntTy, 0); + Elts[2] = C; + + if (subBlockDeclRefDecls.size() == 0) { + // __descriptor + Elts[4] = BuildDescriptorBlockDecl(subBlockHasCopyDispose, subBlockSize, 0, 0); + + // Optimize to being a global block. + Elts[0] = CGM.getNSConcreteGlobalBlock(); + Elts[1] = llvm::ConstantInt::get(IntTy, flags|BLOCK_IS_GLOBAL); + + C = llvm::ConstantStruct::get(Elts); + + char Name[32]; + sprintf(Name, "__block_holder_tmp_%d", CGM.getGlobalUniqueCount()); + C = new llvm::GlobalVariable(C->getType(), true, + llvm::GlobalValue::InternalLinkage, + C, Name, &CGM.getModule()); + QualType BPT = BE->getType(); + C = llvm::ConstantExpr::getBitCast(C, ConvertType(BPT)); + return C; + } + + std::vector<const llvm::Type *> Types(5+subBlockDeclRefDecls.size()); + for (int i=0; i<4; ++i) + Types[i] = Elts[i]->getType(); + Types[4] = PtrToInt8Ty; + + for (unsigned i=0; i < subBlockDeclRefDecls.size(); ++i) { + const Expr *E = subBlockDeclRefDecls[i]; + const BlockDeclRefExpr *BDRE = dyn_cast<BlockDeclRefExpr>(E); + QualType Ty = E->getType(); + if (BDRE && BDRE->isByRef()) { + uint64_t Align = getContext().getDeclAlignInBytes(BDRE->getDecl()); + Types[i+5] = llvm::PointerType::get(BuildByRefType(Ty, Align), 0); + } else + Types[i+5] = ConvertType(Ty); + } + + llvm::StructType *Ty = llvm::StructType::get(Types, true); + + llvm::AllocaInst *A = CreateTempAlloca(Ty); + A->setAlignment(subBlockAlign); + V = A; + + std::vector<HelperInfo> NoteForHelper(subBlockDeclRefDecls.size()); + int helpersize = 0; + + for (unsigned i=0; i<4; ++i) + Builder.CreateStore(Elts[i], Builder.CreateStructGEP(V, i, "block.tmp")); + + for (unsigned i=0; i < subBlockDeclRefDecls.size(); ++i) + { + // FIXME: Push const down. + Expr *E = const_cast<Expr*>(subBlockDeclRefDecls[i]); + DeclRefExpr *DR; + ValueDecl *VD; + + DR = dyn_cast<DeclRefExpr>(E); + // Skip padding. + if (DR) continue; + + BlockDeclRefExpr *BDRE = dyn_cast<BlockDeclRefExpr>(E); + VD = BDRE->getDecl(); + + llvm::Value* Addr = Builder.CreateStructGEP(V, i+5, "tmp"); + NoteForHelper[helpersize].index = i+5; + NoteForHelper[helpersize].RequiresCopying = BlockRequiresCopying(VD->getType()); + NoteForHelper[helpersize].flag + = VD->getType()->isBlockPointerType() ? BLOCK_FIELD_IS_BLOCK : BLOCK_FIELD_IS_OBJECT; + + if (LocalDeclMap[VD]) { + if (BDRE->isByRef()) { + NoteForHelper[helpersize].flag = BLOCK_FIELD_IS_BYREF | + // FIXME: Someone double check this. + (VD->getType().isObjCGCWeak() ? BLOCK_FIELD_IS_WEAK : 0); + const llvm::Type *Ty = Types[i+5]; + llvm::Value *Loc = LocalDeclMap[VD]; + Loc = Builder.CreateStructGEP(Loc, 1, "forwarding"); + Loc = Builder.CreateLoad(Loc, false); + Loc = Builder.CreateBitCast(Loc, Ty); + Builder.CreateStore(Loc, Addr); + ++helpersize; + continue; + } else + E = new (getContext()) DeclRefExpr (cast<NamedDecl>(VD), + VD->getType(), SourceLocation(), + false, false); + } + if (BDRE->isByRef()) { + NoteForHelper[helpersize].flag = BLOCK_FIELD_IS_BYREF | + // FIXME: Someone double check this. + (VD->getType().isObjCGCWeak() ? BLOCK_FIELD_IS_WEAK : 0); + E = new (getContext()) + UnaryOperator(E, UnaryOperator::AddrOf, + getContext().getPointerType(E->getType()), + SourceLocation()); + } + ++helpersize; + + RValue r = EmitAnyExpr(E, Addr, false); + if (r.isScalar()) { + llvm::Value *Loc = r.getScalarVal(); + const llvm::Type *Ty = Types[i+5]; + if (BDRE->isByRef()) { + // E is now the address of the value field, instead, we want the + // address of the actual ByRef struct. We optimize this slightly + // compared to gcc by not grabbing the forwarding slot as this must + // be done during Block_copy for us, and we can postpone the work + // until then. + uint64_t offset = BlockDecls[BDRE->getDecl()]; + + llvm::Value *BlockLiteral = LoadBlockStruct(); + + Loc = Builder.CreateGEP(BlockLiteral, + llvm::ConstantInt::get(llvm::Type::Int64Ty, + offset), + "block.literal"); + Ty = llvm::PointerType::get(Ty, 0); + Loc = Builder.CreateBitCast(Loc, Ty); + Loc = Builder.CreateLoad(Loc, false); + // Loc = Builder.CreateBitCast(Loc, Ty); + } + Builder.CreateStore(Loc, Addr); + } else if (r.isComplex()) + // FIXME: implement + ErrorUnsupported(BE, "complex in block literal"); + else if (r.isAggregate()) + ; // Already created into the destination + else + assert (0 && "bad block variable"); + // FIXME: Ensure that the offset created by the backend for + // the struct matches the previously computed offset in BlockDecls. + } + NoteForHelper.resize(helpersize); + + // __descriptor + llvm::Value *Descriptor = BuildDescriptorBlockDecl(subBlockHasCopyDispose, + subBlockSize, Ty, + &NoteForHelper); + Descriptor = Builder.CreateBitCast(Descriptor, PtrToInt8Ty); + Builder.CreateStore(Descriptor, Builder.CreateStructGEP(V, 4, "block.tmp")); + } + + QualType BPT = BE->getType(); + return Builder.CreateBitCast(V, ConvertType(BPT)); +} + + +const llvm::Type *BlockModule::getBlockDescriptorType() { + if (BlockDescriptorType) + return BlockDescriptorType; + + const llvm::Type *UnsignedLongTy = + getTypes().ConvertType(getContext().UnsignedLongTy); + + // struct __block_descriptor { + // unsigned long reserved; + // unsigned long block_size; + // }; + BlockDescriptorType = llvm::StructType::get(UnsignedLongTy, + UnsignedLongTy, + NULL); + + getModule().addTypeName("struct.__block_descriptor", + BlockDescriptorType); + + return BlockDescriptorType; +} + +const llvm::Type *BlockModule::getGenericBlockLiteralType() { + if (GenericBlockLiteralType) + return GenericBlockLiteralType; + + const llvm::Type *BlockDescPtrTy = + llvm::PointerType::getUnqual(getBlockDescriptorType()); + + const llvm::IntegerType *IntTy = cast<llvm::IntegerType>( + getTypes().ConvertType(getContext().IntTy)); + + // struct __block_literal_generic { + // void *__isa; + // int __flags; + // int __reserved; + // void (*__invoke)(void *); + // struct __block_descriptor *__descriptor; + // }; + GenericBlockLiteralType = llvm::StructType::get(PtrToInt8Ty, + IntTy, + IntTy, + PtrToInt8Ty, + BlockDescPtrTy, + NULL); + + getModule().addTypeName("struct.__block_literal_generic", + GenericBlockLiteralType); + + return GenericBlockLiteralType; +} + +const llvm::Type *BlockModule::getGenericExtendedBlockLiteralType() { + if (GenericExtendedBlockLiteralType) + return GenericExtendedBlockLiteralType; + + const llvm::Type *BlockDescPtrTy = + llvm::PointerType::getUnqual(getBlockDescriptorType()); + + const llvm::IntegerType *IntTy = cast<llvm::IntegerType>( + getTypes().ConvertType(getContext().IntTy)); + + // struct __block_literal_generic { + // void *__isa; + // int __flags; + // int __reserved; + // void (*__invoke)(void *); + // struct __block_descriptor *__descriptor; + // void *__copy_func_helper_decl; + // void *__destroy_func_decl; + // }; + GenericExtendedBlockLiteralType = llvm::StructType::get(PtrToInt8Ty, + IntTy, + IntTy, + PtrToInt8Ty, + BlockDescPtrTy, + PtrToInt8Ty, + PtrToInt8Ty, + NULL); + + getModule().addTypeName("struct.__block_literal_extended_generic", + GenericExtendedBlockLiteralType); + + return GenericExtendedBlockLiteralType; +} + +RValue CodeGenFunction::EmitBlockCallExpr(const CallExpr* E) { + const BlockPointerType *BPT = + E->getCallee()->getType()->getAsBlockPointerType(); + + llvm::Value *Callee = EmitScalarExpr(E->getCallee()); + + // Get a pointer to the generic block literal. + const llvm::Type *BlockLiteralTy = + llvm::PointerType::getUnqual(CGM.getGenericBlockLiteralType()); + + // Bitcast the callee to a block literal. + llvm::Value *BlockLiteral = + Builder.CreateBitCast(Callee, BlockLiteralTy, "block.literal"); + + // Get the function pointer from the literal. + llvm::Value *FuncPtr = Builder.CreateStructGEP(BlockLiteral, 3, "tmp"); + + BlockLiteral = + Builder.CreateBitCast(BlockLiteral, + llvm::PointerType::getUnqual(llvm::Type::Int8Ty), + "tmp"); + + // Add the block literal. + QualType VoidPtrTy = getContext().getPointerType(getContext().VoidTy); + CallArgList Args; + Args.push_back(std::make_pair(RValue::get(BlockLiteral), VoidPtrTy)); + + QualType FnType = BPT->getPointeeType(); + + // And the rest of the arguments. + EmitCallArgs(Args, FnType->getAsFunctionProtoType(), + E->arg_begin(), E->arg_end()); + + // Load the function. + llvm::Value *Func = Builder.CreateLoad(FuncPtr, false, "tmp"); + + QualType ResultType = FnType->getAsFunctionType()->getResultType(); + + const CGFunctionInfo &FnInfo = + CGM.getTypes().getFunctionInfo(ResultType, Args); + + // Cast the function pointer to the right type. + const llvm::Type *BlockFTy = + CGM.getTypes().GetFunctionType(FnInfo, false); + + const llvm::Type *BlockFTyPtr = llvm::PointerType::getUnqual(BlockFTy); + Func = Builder.CreateBitCast(Func, BlockFTyPtr); + + // And call the block. + return EmitCall(FnInfo, Func, Args); +} + +llvm::Value *CodeGenFunction::GetAddrOfBlockDecl(const BlockDeclRefExpr *E) { + uint64_t &offset = BlockDecls[E->getDecl()]; + + const llvm::Type *Ty; + Ty = CGM.getTypes().ConvertType(E->getDecl()->getType()); + + // See if we have already allocated an offset for this variable. + if (offset == 0) { + // Don't run the expensive check, unless we have to. + if (!BlockHasCopyDispose && BlockRequiresCopying(E->getType())) + BlockHasCopyDispose = true; + // if not, allocate one now. + offset = getBlockOffset(E); + } + + llvm::Value *BlockLiteral = LoadBlockStruct(); + llvm::Value *V = Builder.CreateGEP(BlockLiteral, + llvm::ConstantInt::get(llvm::Type::Int64Ty, + offset), + "block.literal"); + if (E->isByRef()) { + bool needsCopyDispose = BlockRequiresCopying(E->getType()); + uint64_t Align = getContext().getDeclAlignInBytes(E->getDecl()); + const llvm::Type *PtrStructTy + = llvm::PointerType::get(BuildByRefType(E->getType(), Align), 0); + // The block literal will need a copy/destroy helper. + BlockHasCopyDispose = true; + Ty = PtrStructTy; + Ty = llvm::PointerType::get(Ty, 0); + V = Builder.CreateBitCast(V, Ty); + V = Builder.CreateLoad(V, false); + V = Builder.CreateStructGEP(V, 1, "forwarding"); + V = Builder.CreateLoad(V, false); + V = Builder.CreateBitCast(V, PtrStructTy); + V = Builder.CreateStructGEP(V, needsCopyDispose*2 + 4, "x"); + } else { + Ty = llvm::PointerType::get(Ty, 0); + V = Builder.CreateBitCast(V, Ty); + } + return V; +} + +void CodeGenFunction::BlockForwardSelf() { + const ObjCMethodDecl *OMD = cast<ObjCMethodDecl>(CurFuncDecl); + ImplicitParamDecl *SelfDecl = OMD->getSelfDecl(); + llvm::Value *&DMEntry = LocalDeclMap[SelfDecl]; + if (DMEntry) + return; + // FIXME - Eliminate BlockDeclRefExprs, clients don't need/want to care + BlockDeclRefExpr *BDRE = new (getContext()) + BlockDeclRefExpr(SelfDecl, + SelfDecl->getType(), SourceLocation(), false); + DMEntry = GetAddrOfBlockDecl(BDRE); +} + +llvm::Constant * +BlockModule::GetAddrOfGlobalBlock(const BlockExpr *BE, const char * n) { + // Generate the block descriptor. + const llvm::Type *UnsignedLongTy = Types.ConvertType(Context.UnsignedLongTy); + const llvm::IntegerType *IntTy = cast<llvm::IntegerType>( + getTypes().ConvertType(getContext().IntTy)); + + llvm::Constant *DescriptorFields[2]; + + // Reserved + DescriptorFields[0] = llvm::Constant::getNullValue(UnsignedLongTy); + + // Block literal size. For global blocks we just use the size of the generic + // block literal struct. + uint64_t BlockLiteralSize = + TheTargetData.getTypeStoreSizeInBits(getGenericBlockLiteralType()) / 8; + DescriptorFields[1] = llvm::ConstantInt::get(UnsignedLongTy,BlockLiteralSize); + + llvm::Constant *DescriptorStruct = + llvm::ConstantStruct::get(&DescriptorFields[0], 2); + + llvm::GlobalVariable *Descriptor = + new llvm::GlobalVariable(DescriptorStruct->getType(), true, + llvm::GlobalVariable::InternalLinkage, + DescriptorStruct, "__block_descriptor_global", + &getModule()); + + // Generate the constants for the block literal. + llvm::Constant *LiteralFields[5]; + + CodeGenFunction::BlockInfo Info(0, n); + uint64_t subBlockSize, subBlockAlign; + llvm::SmallVector<const Expr *, 8> subBlockDeclRefDecls; + bool subBlockHasCopyDispose = false; + llvm::DenseMap<const Decl*, llvm::Value*> LocalDeclMap; + llvm::Function *Fn + = CodeGenFunction(CGM).GenerateBlockFunction(BE, Info, 0, LocalDeclMap, + subBlockSize, + subBlockAlign, + subBlockDeclRefDecls, + subBlockHasCopyDispose); + assert(subBlockSize == BlockLiteralSize + && "no imports allowed for global block"); + + // isa + LiteralFields[0] = getNSConcreteGlobalBlock(); + + // Flags + LiteralFields[1] = + llvm::ConstantInt::get(IntTy, BLOCK_IS_GLOBAL | BLOCK_HAS_DESCRIPTOR); + + // Reserved + LiteralFields[2] = llvm::Constant::getNullValue(IntTy); + + // Function + LiteralFields[3] = Fn; + + // Descriptor + LiteralFields[4] = Descriptor; + + llvm::Constant *BlockLiteralStruct = + llvm::ConstantStruct::get(&LiteralFields[0], 5); + + llvm::GlobalVariable *BlockLiteral = + new llvm::GlobalVariable(BlockLiteralStruct->getType(), true, + llvm::GlobalVariable::InternalLinkage, + BlockLiteralStruct, "__block_literal_global", + &getModule()); + + return BlockLiteral; +} + +llvm::Value *CodeGenFunction::LoadBlockStruct() { + return Builder.CreateLoad(LocalDeclMap[getBlockStructDecl()], "self"); +} + +llvm::Function * +CodeGenFunction::GenerateBlockFunction(const BlockExpr *BExpr, + const BlockInfo& Info, + const Decl *OuterFuncDecl, + llvm::DenseMap<const Decl*, llvm::Value*> ldm, + uint64_t &Size, + uint64_t &Align, + llvm::SmallVector<const Expr *, 8> &subBlockDeclRefDecls, + bool &subBlockHasCopyDispose) { + + // Check if we should generate debug info for this block. + if (CGM.getDebugInfo()) + DebugInfo = CGM.getDebugInfo(); + + // Arrange for local static and local extern declarations to appear + // to be local to this function as well, as they are directly referenced + // in a block. + for (llvm::DenseMap<const Decl *, llvm::Value*>::iterator i = ldm.begin(); + i != ldm.end(); + ++i) { + const VarDecl *VD = dyn_cast<VarDecl>(i->first); + + if (VD->getStorageClass() == VarDecl::Static || VD->hasExternalStorage()) + LocalDeclMap[VD] = i->second; + } + + // FIXME: We need to rearrange the code for copy/dispose so we have this + // sooner, so we can calculate offsets correctly. + if (!BlockHasCopyDispose) + BlockOffset = CGM.getTargetData() + .getTypeStoreSizeInBits(CGM.getGenericBlockLiteralType()) / 8; + else + BlockOffset = CGM.getTargetData() + .getTypeStoreSizeInBits(CGM.getGenericExtendedBlockLiteralType()) / 8; + BlockAlign = getContext().getTypeAlign(getContext().VoidPtrTy) / 8; + + const FunctionType *BlockFunctionType = BExpr->getFunctionType(); + QualType ResultType; + bool IsVariadic; + if (const FunctionProtoType *FTy = + dyn_cast<FunctionProtoType>(BlockFunctionType)) { + ResultType = FTy->getResultType(); + IsVariadic = FTy->isVariadic(); + } + else { + // K&R style block. + ResultType = BlockFunctionType->getResultType(); + IsVariadic = false; + } + + FunctionArgList Args; + + const BlockDecl *BD = BExpr->getBlockDecl(); + + // FIXME: This leaks + ImplicitParamDecl *SelfDecl = + ImplicitParamDecl::Create(getContext(), 0, + SourceLocation(), 0, + getContext().getPointerType(getContext().VoidTy)); + + Args.push_back(std::make_pair(SelfDecl, SelfDecl->getType())); + BlockStructDecl = SelfDecl; + + for (BlockDecl::param_const_iterator i = BD->param_begin(), + e = BD->param_end(); i != e; ++i) + Args.push_back(std::make_pair(*i, (*i)->getType())); + + const CGFunctionInfo &FI = + CGM.getTypes().getFunctionInfo(ResultType, Args); + + std::string Name = std::string("__") + Info.Name + "_block_invoke_"; + CodeGenTypes &Types = CGM.getTypes(); + const llvm::FunctionType *LTy = Types.GetFunctionType(FI, IsVariadic); + + llvm::Function *Fn = + llvm::Function::Create(LTy, llvm::GlobalValue::InternalLinkage, + Name, + &CGM.getModule()); + + CGM.SetInternalFunctionAttributes(BD, Fn, FI); + + StartFunction(BD, ResultType, Fn, Args, + BExpr->getBody()->getLocEnd()); + CurFuncDecl = OuterFuncDecl; + CurCodeDecl = BD; + EmitStmt(BExpr->getBody()); + FinishFunction(cast<CompoundStmt>(BExpr->getBody())->getRBracLoc()); + + // The runtime needs a minimum alignment of a void *. + uint64_t MinAlign = getContext().getTypeAlign(getContext().VoidPtrTy) / 8; + BlockOffset = llvm::RoundUpToAlignment(BlockOffset, MinAlign); + + Size = BlockOffset; + Align = BlockAlign; + subBlockDeclRefDecls = BlockDeclRefDecls; + subBlockHasCopyDispose |= BlockHasCopyDispose; + return Fn; +} + +uint64_t BlockFunction::getBlockOffset(const BlockDeclRefExpr *BDRE) { + const ValueDecl *D = dyn_cast<ValueDecl>(BDRE->getDecl()); + + uint64_t Size = getContext().getTypeSize(D->getType()) / 8; + uint64_t Align = getContext().getDeclAlignInBytes(D); + + if (BDRE->isByRef()) { + Size = getContext().getTypeSize(getContext().VoidPtrTy) / 8; + Align = getContext().getTypeAlign(getContext().VoidPtrTy) / 8; + } + + assert ((Align > 0) && "alignment must be 1 byte or more"); + + uint64_t OldOffset = BlockOffset; + + // Ensure proper alignment, even if it means we have to have a gap + BlockOffset = llvm::RoundUpToAlignment(BlockOffset, Align); + BlockAlign = std::max(Align, BlockAlign); + + uint64_t Pad = BlockOffset - OldOffset; + if (Pad) { + llvm::ArrayType::get(llvm::Type::Int8Ty, Pad); + QualType PadTy = getContext().getConstantArrayType(getContext().CharTy, + llvm::APInt(32, Pad), + ArrayType::Normal, 0); + ValueDecl *PadDecl = VarDecl::Create(getContext(), 0, SourceLocation(), + 0, QualType(PadTy), VarDecl::None, + SourceLocation()); + Expr *E; + E = new (getContext()) DeclRefExpr(PadDecl, PadDecl->getType(), + SourceLocation(), false, false); + BlockDeclRefDecls.push_back(E); + } + BlockDeclRefDecls.push_back(BDRE); + + BlockOffset += Size; + return BlockOffset-Size; +} + +llvm::Constant *BlockFunction:: +GenerateCopyHelperFunction(bool BlockHasCopyDispose, const llvm::StructType *T, + std::vector<HelperInfo> *NoteForHelperp) { + QualType R = getContext().VoidTy; + + FunctionArgList Args; + // FIXME: This leaks + ImplicitParamDecl *Dst = + ImplicitParamDecl::Create(getContext(), 0, SourceLocation(), 0, + getContext().getPointerType(getContext().VoidTy)); + Args.push_back(std::make_pair(Dst, Dst->getType())); + ImplicitParamDecl *Src = + ImplicitParamDecl::Create(getContext(), 0, SourceLocation(), 0, + getContext().getPointerType(getContext().VoidTy)); + Args.push_back(std::make_pair(Src, Src->getType())); + + const CGFunctionInfo &FI = + CGM.getTypes().getFunctionInfo(R, Args); + + std::string Name = std::string("__copy_helper_block_"); + CodeGenTypes &Types = CGM.getTypes(); + const llvm::FunctionType *LTy = Types.GetFunctionType(FI, false); + + llvm::Function *Fn = + llvm::Function::Create(LTy, llvm::GlobalValue::InternalLinkage, + Name, + &CGM.getModule()); + + IdentifierInfo *II + = &CGM.getContext().Idents.get("__copy_helper_block_"); + + FunctionDecl *FD = FunctionDecl::Create(getContext(), + getContext().getTranslationUnitDecl(), + SourceLocation(), II, R, + FunctionDecl::Static, false, + true); + CGF.StartFunction(FD, R, Fn, Args, SourceLocation()); + + llvm::Value *SrcObj = CGF.GetAddrOfLocalVar(Src); + llvm::Type *PtrPtrT; + + if (NoteForHelperp) { + std::vector<HelperInfo> &NoteForHelper = *NoteForHelperp; + + PtrPtrT = llvm::PointerType::get(llvm::PointerType::get(T, 0), 0); + SrcObj = Builder.CreateBitCast(SrcObj, PtrPtrT); + SrcObj = Builder.CreateLoad(SrcObj); + + llvm::Value *DstObj = CGF.GetAddrOfLocalVar(Dst); + llvm::Type *PtrPtrT; + PtrPtrT = llvm::PointerType::get(llvm::PointerType::get(T, 0), 0); + DstObj = Builder.CreateBitCast(DstObj, PtrPtrT); + DstObj = Builder.CreateLoad(DstObj); + + for (unsigned i=0; i < NoteForHelper.size(); ++i) { + int flag = NoteForHelper[i].flag; + int index = NoteForHelper[i].index; + + if ((NoteForHelper[i].flag & BLOCK_FIELD_IS_BYREF) + || NoteForHelper[i].RequiresCopying) { + llvm::Value *Srcv = SrcObj; + Srcv = Builder.CreateStructGEP(Srcv, index); + Srcv = Builder.CreateBitCast(Srcv, + llvm::PointerType::get(PtrToInt8Ty, 0)); + Srcv = Builder.CreateLoad(Srcv); + + llvm::Value *Dstv = Builder.CreateStructGEP(DstObj, index); + Dstv = Builder.CreateBitCast(Dstv, PtrToInt8Ty); + + llvm::Value *N = llvm::ConstantInt::get(llvm::Type::Int32Ty, flag); + llvm::Value *F = getBlockObjectAssign(); + Builder.CreateCall3(F, Dstv, Srcv, N); + } + } + } + + CGF.FinishFunction(); + + return llvm::ConstantExpr::getBitCast(Fn, PtrToInt8Ty); +} + +llvm::Constant *BlockFunction:: +GenerateDestroyHelperFunction(bool BlockHasCopyDispose, + const llvm::StructType* T, + std::vector<HelperInfo> *NoteForHelperp) { + QualType R = getContext().VoidTy; + + FunctionArgList Args; + // FIXME: This leaks + ImplicitParamDecl *Src = + ImplicitParamDecl::Create(getContext(), 0, SourceLocation(), 0, + getContext().getPointerType(getContext().VoidTy)); + + Args.push_back(std::make_pair(Src, Src->getType())); + + const CGFunctionInfo &FI = + CGM.getTypes().getFunctionInfo(R, Args); + + std::string Name = std::string("__destroy_helper_block_"); + CodeGenTypes &Types = CGM.getTypes(); + const llvm::FunctionType *LTy = Types.GetFunctionType(FI, false); + + llvm::Function *Fn = + llvm::Function::Create(LTy, llvm::GlobalValue::InternalLinkage, + Name, + &CGM.getModule()); + + IdentifierInfo *II + = &CGM.getContext().Idents.get("__destroy_helper_block_"); + + FunctionDecl *FD = FunctionDecl::Create(getContext(), + getContext().getTranslationUnitDecl(), + SourceLocation(), II, R, + FunctionDecl::Static, false, + true); + CGF.StartFunction(FD, R, Fn, Args, SourceLocation()); + + if (NoteForHelperp) { + std::vector<HelperInfo> &NoteForHelper = *NoteForHelperp; + + llvm::Value *SrcObj = CGF.GetAddrOfLocalVar(Src); + llvm::Type *PtrPtrT; + PtrPtrT = llvm::PointerType::get(llvm::PointerType::get(T, 0), 0); + SrcObj = Builder.CreateBitCast(SrcObj, PtrPtrT); + SrcObj = Builder.CreateLoad(SrcObj); + + for (unsigned i=0; i < NoteForHelper.size(); ++i) { + int flag = NoteForHelper[i].flag; + int index = NoteForHelper[i].index; + + if ((NoteForHelper[i].flag & BLOCK_FIELD_IS_BYREF) + || NoteForHelper[i].RequiresCopying) { + llvm::Value *Srcv = SrcObj; + Srcv = Builder.CreateStructGEP(Srcv, index); + Srcv = Builder.CreateBitCast(Srcv, + llvm::PointerType::get(PtrToInt8Ty, 0)); + Srcv = Builder.CreateLoad(Srcv); + + BuildBlockRelease(Srcv, flag); + } + } + } + + CGF.FinishFunction(); + + return llvm::ConstantExpr::getBitCast(Fn, PtrToInt8Ty); +} + +llvm::Constant *BlockFunction::BuildCopyHelper(const llvm::StructType *T, + std::vector<HelperInfo> *NoteForHelper) { + return CodeGenFunction(CGM).GenerateCopyHelperFunction(BlockHasCopyDispose, + T, NoteForHelper); +} + +llvm::Constant *BlockFunction::BuildDestroyHelper(const llvm::StructType *T, + std::vector<HelperInfo> *NoteForHelperp) { + return CodeGenFunction(CGM).GenerateDestroyHelperFunction(BlockHasCopyDispose, + T, NoteForHelperp); +} + +llvm::Constant *BlockFunction:: +GeneratebyrefCopyHelperFunction(const llvm::Type *T, int flag) { + QualType R = getContext().VoidTy; + + FunctionArgList Args; + // FIXME: This leaks + ImplicitParamDecl *Dst = + ImplicitParamDecl::Create(getContext(), 0, SourceLocation(), 0, + getContext().getPointerType(getContext().VoidTy)); + Args.push_back(std::make_pair(Dst, Dst->getType())); + + // FIXME: This leaks + ImplicitParamDecl *Src = + ImplicitParamDecl::Create(getContext(), 0, SourceLocation(), 0, + getContext().getPointerType(getContext().VoidTy)); + Args.push_back(std::make_pair(Src, Src->getType())); + + const CGFunctionInfo &FI = + CGM.getTypes().getFunctionInfo(R, Args); + + std::string Name = std::string("__Block_byref_id_object_copy_"); + CodeGenTypes &Types = CGM.getTypes(); + const llvm::FunctionType *LTy = Types.GetFunctionType(FI, false); + + llvm::Function *Fn = + llvm::Function::Create(LTy, llvm::GlobalValue::InternalLinkage, + Name, + &CGM.getModule()); + + IdentifierInfo *II + = &CGM.getContext().Idents.get("__Block_byref_id_object_copy_"); + + FunctionDecl *FD = FunctionDecl::Create(getContext(), + getContext().getTranslationUnitDecl(), + SourceLocation(), II, R, + FunctionDecl::Static, false, + true); + CGF.StartFunction(FD, R, Fn, Args, SourceLocation()); + + // dst->x + llvm::Value *V = CGF.GetAddrOfLocalVar(Dst); + V = Builder.CreateBitCast(V, llvm::PointerType::get(T, 0)); + V = Builder.CreateLoad(V); + V = Builder.CreateStructGEP(V, 6, "x"); + llvm::Value *DstObj = Builder.CreateBitCast(V, PtrToInt8Ty); + + // src->x + V = CGF.GetAddrOfLocalVar(Src); + V = Builder.CreateLoad(V); + V = Builder.CreateBitCast(V, T); + V = Builder.CreateStructGEP(V, 6, "x"); + V = Builder.CreateBitCast(V, llvm::PointerType::get(PtrToInt8Ty, 0)); + llvm::Value *SrcObj = Builder.CreateLoad(V); + + flag |= BLOCK_BYREF_CALLER; + + llvm::Value *N = llvm::ConstantInt::get(llvm::Type::Int32Ty, flag); + llvm::Value *F = getBlockObjectAssign(); + Builder.CreateCall3(F, DstObj, SrcObj, N); + + CGF.FinishFunction(); + + return llvm::ConstantExpr::getBitCast(Fn, PtrToInt8Ty); +} + +llvm::Constant * +BlockFunction::GeneratebyrefDestroyHelperFunction(const llvm::Type *T, + int flag) { + QualType R = getContext().VoidTy; + + FunctionArgList Args; + // FIXME: This leaks + ImplicitParamDecl *Src = + ImplicitParamDecl::Create(getContext(), 0, SourceLocation(), 0, + getContext().getPointerType(getContext().VoidTy)); + + Args.push_back(std::make_pair(Src, Src->getType())); + + const CGFunctionInfo &FI = + CGM.getTypes().getFunctionInfo(R, Args); + + std::string Name = std::string("__Block_byref_id_object_dispose_"); + CodeGenTypes &Types = CGM.getTypes(); + const llvm::FunctionType *LTy = Types.GetFunctionType(FI, false); + + llvm::Function *Fn = + llvm::Function::Create(LTy, llvm::GlobalValue::InternalLinkage, + Name, + &CGM.getModule()); + + IdentifierInfo *II + = &CGM.getContext().Idents.get("__Block_byref_id_object_dispose_"); + + FunctionDecl *FD = FunctionDecl::Create(getContext(), + getContext().getTranslationUnitDecl(), + SourceLocation(), II, R, + FunctionDecl::Static, false, + true); + CGF.StartFunction(FD, R, Fn, Args, SourceLocation()); + + llvm::Value *V = CGF.GetAddrOfLocalVar(Src); + V = Builder.CreateBitCast(V, llvm::PointerType::get(T, 0)); + V = Builder.CreateLoad(V); + V = Builder.CreateStructGEP(V, 6, "x"); + V = Builder.CreateBitCast(V, llvm::PointerType::get(PtrToInt8Ty, 0)); + V = Builder.CreateLoad(V); + + flag |= BLOCK_BYREF_CALLER; + BuildBlockRelease(V, flag); + CGF.FinishFunction(); + + return llvm::ConstantExpr::getBitCast(Fn, PtrToInt8Ty); +} + +llvm::Constant *BlockFunction::BuildbyrefCopyHelper(const llvm::Type *T, + int flag) { + return CodeGenFunction(CGM).GeneratebyrefCopyHelperFunction(T, flag); +} + +llvm::Constant *BlockFunction::BuildbyrefDestroyHelper(const llvm::Type *T, + int flag) { + return CodeGenFunction(CGM).GeneratebyrefDestroyHelperFunction(T, flag); +} + +llvm::Value *BlockFunction::getBlockObjectDispose() { + if (CGM.BlockObjectDispose == 0) { + const llvm::FunctionType *FTy; + std::vector<const llvm::Type*> ArgTys; + const llvm::Type *ResultType = llvm::Type::VoidTy; + ArgTys.push_back(PtrToInt8Ty); + ArgTys.push_back(llvm::Type::Int32Ty); + FTy = llvm::FunctionType::get(ResultType, ArgTys, false); + CGM.BlockObjectDispose + = CGM.CreateRuntimeFunction(FTy, "_Block_object_dispose"); + } + return CGM.BlockObjectDispose; +} + +llvm::Value *BlockFunction::getBlockObjectAssign() { + if (CGM.BlockObjectAssign == 0) { + const llvm::FunctionType *FTy; + std::vector<const llvm::Type*> ArgTys; + const llvm::Type *ResultType = llvm::Type::VoidTy; + ArgTys.push_back(PtrToInt8Ty); + ArgTys.push_back(PtrToInt8Ty); + ArgTys.push_back(llvm::Type::Int32Ty); + FTy = llvm::FunctionType::get(ResultType, ArgTys, false); + CGM.BlockObjectAssign + = CGM.CreateRuntimeFunction(FTy, "_Block_object_assign"); + } + return CGM.BlockObjectAssign; +} + +void BlockFunction::BuildBlockRelease(llvm::Value *V, int flag) { + llvm::Value *F = getBlockObjectDispose(); + llvm::Value *N; + V = Builder.CreateBitCast(V, PtrToInt8Ty); + N = llvm::ConstantInt::get(llvm::Type::Int32Ty, flag); + Builder.CreateCall2(F, V, N); +} + +ASTContext &BlockFunction::getContext() const { return CGM.getContext(); } + +BlockFunction::BlockFunction(CodeGenModule &cgm, CodeGenFunction &cgf, + CGBuilderTy &B) + : CGM(cgm), CGF(cgf), Builder(B) { + PtrToInt8Ty = llvm::PointerType::getUnqual(llvm::Type::Int8Ty); + + BlockHasCopyDispose = false; +} |
