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Diffstat (limited to 'contrib/llvm/tools/clang/lib/CodeGen/CGBlocks.cpp')
| -rw-r--r-- | contrib/llvm/tools/clang/lib/CodeGen/CGBlocks.cpp | 1284 |
1 files changed, 1284 insertions, 0 deletions
diff --git a/contrib/llvm/tools/clang/lib/CodeGen/CGBlocks.cpp b/contrib/llvm/tools/clang/lib/CodeGen/CGBlocks.cpp new file mode 100644 index 0000000..de58597 --- /dev/null +++ b/contrib/llvm/tools/clang/lib/CodeGen/CGBlocks.cpp @@ -0,0 +1,1284 @@ +//===--- 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 "CGDebugInfo.h" +#include "CodeGenFunction.h" +#include "CGObjCRuntime.h" +#include "CodeGenModule.h" +#include "clang/AST/DeclObjC.h" +#include "llvm/Module.h" +#include "llvm/ADT/SmallSet.h" +#include "llvm/Target/TargetData.h" +#include <algorithm> + +using namespace clang; +using namespace CodeGen; + +/// CGBlockInfo - Information to generate a block literal. +class clang::CodeGen::CGBlockInfo { +public: + /// Name - The name of the block, kindof. + const char *Name; + + /// DeclRefs - Variables from parent scopes that have been + /// imported into this block. + llvm::SmallVector<const BlockDeclRefExpr *, 8> DeclRefs; + + /// InnerBlocks - This block and the blocks it encloses. + llvm::SmallPtrSet<const DeclContext *, 4> InnerBlocks; + + /// CXXThisRef - Non-null if 'this' was required somewhere, in + /// which case this is that expression. + const CXXThisExpr *CXXThisRef; + + /// NeedsObjCSelf - True if something in this block has an implicit + /// reference to 'self'. + bool NeedsObjCSelf; + + /// These are initialized by GenerateBlockFunction. + bool BlockHasCopyDispose; + CharUnits BlockSize; + CharUnits BlockAlign; + llvm::SmallVector<const Expr*, 8> BlockLayout; + + CGBlockInfo(const char *Name); +}; + +CGBlockInfo::CGBlockInfo(const char *N) + : Name(N), CXXThisRef(0), NeedsObjCSelf(false) { + + // Skip asm prefix, if any. + if (Name && Name[0] == '\01') + ++Name; +} + + +llvm::Constant *CodeGenFunction:: +BuildDescriptorBlockDecl(const BlockExpr *BE, bool BlockHasCopyDispose, CharUnits 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.getQuantity()); + Elts.push_back(C); + + // optional copy/dispose helpers + if (BlockHasCopyDispose) { + // copy_func_helper_decl + Elts.push_back(BuildCopyHelper(Ty, NoteForHelper)); + + // destroy_func_decl + Elts.push_back(BuildDestroyHelper(Ty, NoteForHelper)); + } + + // Signature. non-optional ObjC-style method descriptor @encode sequence + std::string BlockTypeEncoding; + CGM.getContext().getObjCEncodingForBlock(BE, BlockTypeEncoding); + + Elts.push_back(llvm::ConstantExpr::getBitCast( + CGM.GetAddrOfConstantCString(BlockTypeEncoding), PtrToInt8Ty)); + + // Layout. + C = llvm::ConstantInt::get(UnsignedLongTy, 0); + Elts.push_back(C); + + C = llvm::ConstantStruct::get(VMContext, Elts, false); + + C = new llvm::GlobalVariable(CGM.getModule(), C->getType(), true, + llvm::GlobalValue::InternalLinkage, + C, "__block_descriptor_tmp"); + 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, CGBlockInfo &Info) { + for (Stmt::const_child_iterator I = S->child_begin(), E = S->child_end(); + I != E; ++I) + if (*I) + CollectBlockDeclRefInfo(*I, Info); + + // We want to ensure we walk down into block literals so we can find + // all nested BlockDeclRefExprs. + if (const BlockExpr *BE = dyn_cast<BlockExpr>(S)) { + Info.InnerBlocks.insert(BE->getBlockDecl()); + CollectBlockDeclRefInfo(BE->getBody(), Info); + } + + else if (const BlockDeclRefExpr *BDRE = dyn_cast<BlockDeclRefExpr>(S)) { + const ValueDecl *D = BDRE->getDecl(); + // FIXME: Handle enums. + if (isa<FunctionDecl>(D)) + return; + + if (isa<ImplicitParamDecl>(D) && + isa<ObjCMethodDecl>(D->getDeclContext()) && + cast<ObjCMethodDecl>(D->getDeclContext())->getSelfDecl() == D) { + Info.NeedsObjCSelf = true; + return; + } + + // Only Decls that escape are added. + if (!Info.InnerBlocks.count(D->getDeclContext())) + Info.DeclRefs.push_back(BDRE); + } + + // Make sure to capture implicit 'self' references due to super calls. + else if (const ObjCMessageExpr *E = dyn_cast<ObjCMessageExpr>(S)) { + if (E->getReceiverKind() == ObjCMessageExpr::SuperClass || + E->getReceiverKind() == ObjCMessageExpr::SuperInstance) + Info.NeedsObjCSelf = true; + } + + // Getter/setter uses may also cause implicit super references, + // which we can check for with: + else if (isa<ObjCSuperExpr>(S)) + Info.NeedsObjCSelf = true; + + else if (isa<CXXThisExpr>(S)) + Info.CXXThisRef = cast<CXXThisExpr>(S); +} + +/// CanBlockBeGlobal - Given a CGBlockInfo struct, determines if a block can be +/// declared as a global variable instead of on the stack. +static bool CanBlockBeGlobal(const CGBlockInfo &Info) { + return Info.DeclRefs.empty(); +} + +/// AllocateAllBlockDeclRefs - Preallocate all nested BlockDeclRefExprs to +/// ensure we can generate the debug information for the parameter for the block +/// invoke function. +static void AllocateAllBlockDeclRefs(CodeGenFunction &CGF, CGBlockInfo &Info) { + if (Info.CXXThisRef) + CGF.AllocateBlockCXXThisPointer(Info.CXXThisRef); + + for (size_t i = 0; i < Info.DeclRefs.size(); ++i) + CGF.AllocateBlockDecl(Info.DeclRefs[i]); + + if (Info.NeedsObjCSelf) { + ValueDecl *Self = cast<ObjCMethodDecl>(CGF.CurFuncDecl)->getSelfDecl(); + BlockDeclRefExpr *BDRE = + new (CGF.getContext()) BlockDeclRefExpr(Self, Self->getType(), + SourceLocation(), false); + Info.DeclRefs.push_back(BDRE); + CGF.AllocateBlockDecl(BDRE); + } +} + +// 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(); + CGBlockInfo Info(Name.c_str()); + Info.InnerBlocks.insert(BE->getBlockDecl()); + 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()); + + size_t BlockFields = 5; + + std::vector<llvm::Constant*> Elts(BlockFields); + + llvm::Constant *C; + llvm::Value *V; + + { + // C = BuildBlockStructInitlist(); + unsigned int flags = BLOCK_HAS_SIGNATURE; + + // We run this first so that we set BlockHasCopyDispose from the entire + // block literal. + // __invoke + llvm::Function *Fn + = CodeGenFunction(CGM).GenerateBlockFunction(BE, Info, CurFuncDecl, + LocalDeclMap); + BlockHasCopyDispose |= Info.BlockHasCopyDispose; + Elts[3] = Fn; + + // FIXME: Don't use BlockHasCopyDispose, it is set more often then + // necessary, for example: { ^{ __block int i; ^{ i = 1; }(); }(); } + if (Info.BlockHasCopyDispose) + flags |= BLOCK_HAS_COPY_DISPOSE; + + // __isa + C = CGM.getNSConcreteStackBlock(); + C = llvm::ConstantExpr::getBitCast(C, PtrToInt8Ty); + Elts[0] = C; + + // __flags + { + QualType BPT = BE->getType(); + const FunctionType *ftype = BPT->getPointeeType()->getAs<FunctionType>(); + QualType ResultType = ftype->getResultType(); + + CallArgList Args; + CodeGenTypes &Types = CGM.getTypes(); + const CGFunctionInfo &FnInfo = Types.getFunctionInfo(ResultType, Args, + FunctionType::ExtInfo()); + if (CGM.ReturnTypeUsesSret(FnInfo)) + flags |= BLOCK_USE_STRET; + } + 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 (Info.BlockLayout.empty()) { + // __descriptor + Elts[4] = BuildDescriptorBlockDecl(BE, Info.BlockHasCopyDispose, + Info.BlockSize, 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(VMContext, Elts, false); + + C = new llvm::GlobalVariable(CGM.getModule(), C->getType(), true, + llvm::GlobalValue::InternalLinkage, C, + "__block_holder_tmp_" + + llvm::Twine(CGM.getGlobalUniqueCount())); + QualType BPT = BE->getType(); + C = llvm::ConstantExpr::getBitCast(C, ConvertType(BPT)); + return C; + } + + std::vector<const llvm::Type *> Types(BlockFields+Info.BlockLayout.size()); + for (int i=0; i<4; ++i) + Types[i] = Elts[i]->getType(); + Types[4] = PtrToInt8Ty; + + for (unsigned i = 0, n = Info.BlockLayout.size(); i != n; ++i) { + const Expr *E = Info.BlockLayout[i]; + const BlockDeclRefExpr *BDRE = dyn_cast<BlockDeclRefExpr>(E); + QualType Ty = E->getType(); + if (BDRE && BDRE->isByRef()) { + Types[i+BlockFields] = llvm::PointerType::get(BuildByRefType(BDRE->getDecl()), 0); + } else + Types[i+BlockFields] = ConvertType(Ty); + } + + llvm::StructType *Ty = llvm::StructType::get(VMContext, Types, true); + + llvm::AllocaInst *A = CreateTempAlloca(Ty); + A->setAlignment(Info.BlockAlign.getQuantity()); + V = A; + + // Build layout / cleanup information for all the data entries in the + // layout, and write the enclosing fields into the type. + std::vector<HelperInfo> NoteForHelper(Info.BlockLayout.size()); + unsigned NumHelpers = 0; + + for (unsigned i=0; i<4; ++i) + Builder.CreateStore(Elts[i], Builder.CreateStructGEP(V, i, "block.tmp")); + + for (unsigned i=0; i < Info.BlockLayout.size(); ++i) { + const Expr *E = Info.BlockLayout[i]; + + // Skip padding. + if (isa<DeclRefExpr>(E)) continue; + + llvm::Value* Addr = Builder.CreateStructGEP(V, i+BlockFields, "tmp"); + HelperInfo &Note = NoteForHelper[NumHelpers++]; + + Note.index = i+5; + + if (isa<CXXThisExpr>(E)) { + Note.RequiresCopying = false; + Note.flag = BLOCK_FIELD_IS_OBJECT; + + Builder.CreateStore(LoadCXXThis(), Addr); + continue; + } + + const BlockDeclRefExpr *BDRE = cast<BlockDeclRefExpr>(E); + const ValueDecl *VD = BDRE->getDecl(); + QualType T = VD->getType(); + + Note.RequiresCopying = BlockRequiresCopying(T); + + if (BDRE->isByRef()) { + Note.flag = BLOCK_FIELD_IS_BYREF; + if (T.isObjCGCWeak()) + Note.flag |= BLOCK_FIELD_IS_WEAK; + } else if (T->isBlockPointerType()) { + Note.flag = BLOCK_FIELD_IS_BLOCK; + } else { + Note.flag = BLOCK_FIELD_IS_OBJECT; + } + + if (LocalDeclMap[VD]) { + if (BDRE->isByRef()) { + llvm::Value *Loc = LocalDeclMap[VD]; + Loc = Builder.CreateStructGEP(Loc, 1, "forwarding"); + Loc = Builder.CreateLoad(Loc); + Builder.CreateStore(Loc, Addr); + continue; + } else { + E = new (getContext()) DeclRefExpr(const_cast<ValueDecl*>(VD), + VD->getType(), + SourceLocation()); + } + } + + if (BDRE->isByRef()) { + E = new (getContext()) + UnaryOperator(const_cast<Expr*>(E), UnaryOperator::AddrOf, + getContext().getPointerType(E->getType()), + SourceLocation()); + } + + RValue r = EmitAnyExpr(E, Addr, false); + if (r.isScalar()) { + llvm::Value *Loc = r.getScalarVal(); + const llvm::Type *Ty = Types[i+BlockFields]; + 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. + CharUnits offset = BlockDecls[BDRE->getDecl()]; + + llvm::Value *BlockLiteral = LoadBlockStruct(); + + Loc = Builder.CreateGEP(BlockLiteral, + llvm::ConstantInt::get(llvm::Type::getInt64Ty(VMContext), + offset.getQuantity()), + "block.literal"); + Ty = llvm::PointerType::get(Ty, 0); + Loc = Builder.CreateBitCast(Loc, Ty); + Loc = Builder.CreateLoad(Loc); + // 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(NumHelpers); + + // __descriptor + llvm::Value *Descriptor = BuildDescriptorBlockDecl(BE, + Info.BlockHasCopyDispose, + Info.BlockSize, Ty, + &NoteForHelper); + Descriptor = Builder.CreateBitCast(Descriptor, PtrToInt8Ty); + Builder.CreateStore(Descriptor, Builder.CreateStructGEP(V, 4, "block.tmp")); + } + + QualType BPT = BE->getType(); + V = Builder.CreateBitCast(V, ConvertType(BPT)); + // See if this is a __weak block variable and the must call objc_read_weak + // on it. + const FunctionType *ftype = BPT->getPointeeType()->getAs<FunctionType>(); + QualType RES = ftype->getResultType(); + if (RES.isObjCGCWeak()) { + // Must cast argument to id* + const llvm::Type *ObjectPtrTy = + ConvertType(CGM.getContext().getObjCIdType()); + const llvm::Type *PtrObjectPtrTy = + llvm::PointerType::getUnqual(ObjectPtrTy); + V = Builder.CreateBitCast(V, PtrObjectPtrTy); + V = CGM.getObjCRuntime().EmitObjCWeakRead(*this, V); + } + return V; +} + + +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; + // + // // later, the following will be added + // + // struct { + // void (*copyHelper)(); + // void (*copyHelper)(); + // } helpers; // !!! optional + // + // const char *signature; // the block signature + // const char *layout; // reserved + // }; + BlockDescriptorType = llvm::StructType::get(UnsignedLongTy->getContext(), + 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(IntTy->getContext(), + PtrToInt8Ty, + IntTy, + IntTy, + PtrToInt8Ty, + BlockDescPtrTy, + NULL); + + getModule().addTypeName("struct.__block_literal_generic", + GenericBlockLiteralType); + + return GenericBlockLiteralType; +} + + +RValue CodeGenFunction::EmitBlockCallExpr(const CallExpr* E, + ReturnValueSlot ReturnValue) { + const BlockPointerType *BPT = + E->getCallee()->getType()->getAs<BlockPointerType>(); + + 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::Type::getInt8PtrTy(VMContext), + "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->getAs<FunctionProtoType>(), + E->arg_begin(), E->arg_end()); + + // Load the function. + llvm::Value *Func = Builder.CreateLoad(FuncPtr, "tmp"); + + const FunctionType *FuncTy = FnType->getAs<FunctionType>(); + QualType ResultType = FuncTy->getResultType(); + + const CGFunctionInfo &FnInfo = + CGM.getTypes().getFunctionInfo(ResultType, Args, + FuncTy->getExtInfo()); + + // 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, ReturnValue, Args); +} + +void CodeGenFunction::AllocateBlockCXXThisPointer(const CXXThisExpr *E) { + assert(BlockCXXThisOffset.isZero() && "already computed 'this' pointer"); + + // Figure out what the offset is. + QualType T = E->getType(); + std::pair<CharUnits,CharUnits> TypeInfo = getContext().getTypeInfoInChars(T); + CharUnits Offset = getBlockOffset(TypeInfo.first, TypeInfo.second); + + BlockCXXThisOffset = Offset; + BlockLayout.push_back(E); +} + +void CodeGenFunction::AllocateBlockDecl(const BlockDeclRefExpr *E) { + const ValueDecl *VD = E->getDecl(); + CharUnits &Offset = BlockDecls[VD]; + + // See if we have already allocated an offset for this variable. + if (!Offset.isZero()) + return; + + // Don't run the expensive check, unless we have to. + if (!BlockHasCopyDispose) + if (E->isByRef() + || BlockRequiresCopying(E->getType())) + BlockHasCopyDispose = true; + + const ValueDecl *D = cast<ValueDecl>(E->getDecl()); + + CharUnits Size; + CharUnits Align; + + if (E->isByRef()) { + llvm::tie(Size,Align) = + getContext().getTypeInfoInChars(getContext().VoidPtrTy); + } else { + Size = getContext().getTypeSizeInChars(D->getType()); + Align = getContext().getDeclAlign(D); + } + + Offset = getBlockOffset(Size, Align); + BlockLayout.push_back(E); +} + +llvm::Value *CodeGenFunction::GetAddrOfBlockDecl(const ValueDecl *VD, + bool IsByRef) { + CharUnits offset = BlockDecls[VD]; + assert(!offset.isZero() && "getting address of unallocated decl"); + + llvm::Value *BlockLiteral = LoadBlockStruct(); + llvm::Value *V = Builder.CreateGEP(BlockLiteral, + llvm::ConstantInt::get(llvm::Type::getInt64Ty(VMContext), + offset.getQuantity()), + "block.literal"); + if (IsByRef) { + const llvm::Type *PtrStructTy + = llvm::PointerType::get(BuildByRefType(VD), 0); + // The block literal will need a copy/destroy helper. + BlockHasCopyDispose = true; + + const llvm::Type *Ty = PtrStructTy; + Ty = llvm::PointerType::get(Ty, 0); + V = Builder.CreateBitCast(V, Ty); + V = Builder.CreateLoad(V); + V = Builder.CreateStructGEP(V, 1, "forwarding"); + V = Builder.CreateLoad(V); + V = Builder.CreateBitCast(V, PtrStructTy); + V = Builder.CreateStructGEP(V, getByRefValueLLVMField(VD), + VD->getNameAsString()); + if (VD->getType()->isReferenceType()) + V = Builder.CreateLoad(V); + } else { + const llvm::Type *Ty = CGM.getTypes().ConvertType(VD->getType()); + + Ty = llvm::PointerType::get(Ty, 0); + V = Builder.CreateBitCast(V, Ty); + } + return V; +} + +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[4]; + + // Reserved + DescriptorFields[0] = llvm::Constant::getNullValue(UnsignedLongTy); + + // Block literal size. For global blocks we just use the size of the generic + // block literal struct. + CharUnits BlockLiteralSize = + CGM.GetTargetTypeStoreSize(getGenericBlockLiteralType()); + DescriptorFields[1] = + llvm::ConstantInt::get(UnsignedLongTy,BlockLiteralSize.getQuantity()); + + // signature. non-optional ObjC-style method descriptor @encode sequence + std::string BlockTypeEncoding; + CGM.getContext().getObjCEncodingForBlock(BE, BlockTypeEncoding); + + DescriptorFields[2] = llvm::ConstantExpr::getBitCast( + CGM.GetAddrOfConstantCString(BlockTypeEncoding), PtrToInt8Ty); + + // layout + DescriptorFields[3] = + llvm::ConstantInt::get(UnsignedLongTy,0); + + // build the structure from the 4 elements + llvm::Constant *DescriptorStruct = + llvm::ConstantStruct::get(VMContext, &DescriptorFields[0], 4, false); + + llvm::GlobalVariable *Descriptor = + new llvm::GlobalVariable(getModule(), DescriptorStruct->getType(), true, + llvm::GlobalVariable::InternalLinkage, + DescriptorStruct, "__block_descriptor_global"); + + int FieldCount = 5; + // Generate the constants for the block literal. + + std::vector<llvm::Constant*> LiteralFields(FieldCount); + + CGBlockInfo Info(n); + llvm::DenseMap<const Decl*, llvm::Value*> LocalDeclMap; + llvm::Function *Fn + = CodeGenFunction(CGM).GenerateBlockFunction(BE, Info, 0, LocalDeclMap); + assert(Info.BlockSize == BlockLiteralSize + && "no imports allowed for global block"); + + // isa + LiteralFields[0] = getNSConcreteGlobalBlock(); + + // Flags + LiteralFields[1] = + llvm::ConstantInt::get(IntTy, BLOCK_IS_GLOBAL | BLOCK_HAS_SIGNATURE); + + // Reserved + LiteralFields[2] = llvm::Constant::getNullValue(IntTy); + + // Function + LiteralFields[3] = Fn; + + // Descriptor + LiteralFields[4] = Descriptor; + + llvm::Constant *BlockLiteralStruct = + llvm::ConstantStruct::get(VMContext, LiteralFields, false); + + llvm::GlobalVariable *BlockLiteral = + new llvm::GlobalVariable(getModule(), BlockLiteralStruct->getType(), true, + llvm::GlobalVariable::InternalLinkage, + BlockLiteralStruct, "__block_literal_global"); + + return BlockLiteral; +} + +llvm::Value *CodeGenFunction::LoadBlockStruct() { + llvm::Value *V = Builder.CreateLoad(LocalDeclMap[getBlockStructDecl()], + "self"); + // For now, we codegen based upon byte offsets. + return Builder.CreateBitCast(V, PtrToInt8Ty); +} + +llvm::Function * +CodeGenFunction::GenerateBlockFunction(const BlockExpr *BExpr, + CGBlockInfo &Info, + const Decl *OuterFuncDecl, + llvm::DenseMap<const Decl*, llvm::Value*> ldm) { + + // 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; + } + + BlockOffset = + CGM.GetTargetTypeStoreSize(CGM.getGenericBlockLiteralType()); + BlockAlign = getContext().getTypeAlignInChars(getContext().VoidPtrTy); + + const FunctionType *BlockFunctionType = BExpr->getFunctionType(); + QualType ResultType; + FunctionType::ExtInfo EInfo = getFunctionExtInfo(*BlockFunctionType); + 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; + + CurFuncDecl = OuterFuncDecl; + + const BlockDecl *BD = BExpr->getBlockDecl(); + + IdentifierInfo *II = &CGM.getContext().Idents.get(".block_descriptor"); + + // Build the block struct now. + AllocateAllBlockDeclRefs(*this, Info); + + QualType ParmTy = getContext().getBlockParmType(BlockHasCopyDispose, + BlockLayout); + + // FIXME: This leaks + ImplicitParamDecl *SelfDecl = + ImplicitParamDecl::Create(getContext(), const_cast<BlockDecl*>(BD), + SourceLocation(), II, + ParmTy); + + 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, EInfo); + + CodeGenTypes &Types = CGM.getTypes(); + const llvm::FunctionType *LTy = Types.GetFunctionType(FI, IsVariadic); + + MangleBuffer Name; + CGM.getMangledName(Name, BD); + llvm::Function *Fn = + llvm::Function::Create(LTy, llvm::GlobalValue::InternalLinkage, + Name.getString(), &CGM.getModule()); + + CGM.SetInternalFunctionAttributes(BD, Fn, FI); + + StartFunction(BD, ResultType, Fn, Args, + BExpr->getBody()->getLocEnd()); + + CurFuncDecl = OuterFuncDecl; + CurCodeDecl = BD; + + // If we have a C++ 'this' reference, go ahead and force it into + // existence now. + if (Info.CXXThisRef) { + assert(!BlockCXXThisOffset.isZero() && + "haven't yet allocated 'this' reference"); + + // TODO: I have a dream that one day this will be typed. + llvm::Value *BlockLiteral = LoadBlockStruct(); + llvm::Value *ThisPtrRaw = + Builder.CreateConstInBoundsGEP1_64(BlockLiteral, + BlockCXXThisOffset.getQuantity(), + "this.ptr.raw"); + + const llvm::Type *Ty = + CGM.getTypes().ConvertType(Info.CXXThisRef->getType()); + Ty = llvm::PointerType::get(Ty, 0); + llvm::Value *ThisPtr = Builder.CreateBitCast(ThisPtrRaw, Ty, "this.ptr"); + + CXXThisValue = Builder.CreateLoad(ThisPtr, "this"); + } + + // If we have an Objective C 'self' reference, go ahead and force it + // into existence now. + if (Info.NeedsObjCSelf) { + ValueDecl *Self = cast<ObjCMethodDecl>(CurFuncDecl)->getSelfDecl(); + LocalDeclMap[Self] = GetAddrOfBlockDecl(Self, false); + } + + // Save a spot to insert the debug information for all the BlockDeclRefDecls. + llvm::BasicBlock *entry = Builder.GetInsertBlock(); + llvm::BasicBlock::iterator entry_ptr = Builder.GetInsertPoint(); + --entry_ptr; + + EmitStmt(BExpr->getBody()); + + // Remember where we were... + llvm::BasicBlock *resume = Builder.GetInsertBlock(); + + // Go back to the entry. + ++entry_ptr; + Builder.SetInsertPoint(entry, entry_ptr); + + if (CGDebugInfo *DI = getDebugInfo()) { + // Emit debug information for all the BlockDeclRefDecls. + // FIXME: also for 'this' + for (unsigned i = 0, e = BlockLayout.size(); i != e; ++i) { + if (const BlockDeclRefExpr *BDRE = + dyn_cast<BlockDeclRefExpr>(BlockLayout[i])) { + const ValueDecl *D = BDRE->getDecl(); + DI->setLocation(D->getLocation()); + DI->EmitDeclareOfBlockDeclRefVariable(BDRE, + LocalDeclMap[getBlockStructDecl()], + Builder, this); + } + } + } + // And resume where we left off. + if (resume == 0) + Builder.ClearInsertionPoint(); + else + Builder.SetInsertPoint(resume); + + FinishFunction(cast<CompoundStmt>(BExpr->getBody())->getRBracLoc()); + + // The runtime needs a minimum alignment of a void *. + CharUnits MinAlign = getContext().getTypeAlignInChars(getContext().VoidPtrTy); + BlockOffset = CharUnits::fromQuantity( + llvm::RoundUpToAlignment(BlockOffset.getQuantity(), + MinAlign.getQuantity())); + + Info.BlockSize = BlockOffset; + Info.BlockAlign = BlockAlign; + Info.BlockLayout = BlockLayout; + Info.BlockHasCopyDispose = BlockHasCopyDispose; + return Fn; +} + +CharUnits BlockFunction::getBlockOffset(CharUnits Size, CharUnits Align) { + assert((Align.isPositive()) && "alignment must be 1 byte or more"); + + CharUnits OldOffset = BlockOffset; + + // Ensure proper alignment, even if it means we have to have a gap + BlockOffset = CharUnits::fromQuantity( + llvm::RoundUpToAlignment(BlockOffset.getQuantity(), Align.getQuantity())); + BlockAlign = std::max(Align, BlockAlign); + + CharUnits Pad = BlockOffset - OldOffset; + if (Pad.isPositive()) { + QualType PadTy = getContext().getConstantArrayType(getContext().CharTy, + llvm::APInt(32, + Pad.getQuantity()), + ArrayType::Normal, 0); + ValueDecl *PadDecl = VarDecl::Create(getContext(), + getContext().getTranslationUnitDecl(), + SourceLocation(), + 0, QualType(PadTy), 0, + VarDecl::None, VarDecl::None); + Expr *E = new (getContext()) DeclRefExpr(PadDecl, PadDecl->getType(), + SourceLocation()); + BlockLayout.push_back(E); + } + + 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, FunctionType::ExtInfo()); + + // FIXME: We'd like to put these into a mergable by content, with + // internal linkage. + CodeGenTypes &Types = CGM.getTypes(); + const llvm::FunctionType *LTy = Types.GetFunctionType(FI, false); + + llvm::Function *Fn = + llvm::Function::Create(LTy, llvm::GlobalValue::InternalLinkage, + "__copy_helper_block_", &CGM.getModule()); + + IdentifierInfo *II + = &CGM.getContext().Idents.get("__copy_helper_block_"); + + FunctionDecl *FD = FunctionDecl::Create(getContext(), + getContext().getTranslationUnitDecl(), + SourceLocation(), II, R, 0, + FunctionDecl::Static, + FunctionDecl::None, + 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::getInt32Ty(T->getContext()), 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, FunctionType::ExtInfo()); + + // FIXME: We'd like to put these into a mergable by content, with + // internal linkage. + CodeGenTypes &Types = CGM.getTypes(); + const llvm::FunctionType *LTy = Types.GetFunctionType(FI, false); + + llvm::Function *Fn = + llvm::Function::Create(LTy, llvm::GlobalValue::InternalLinkage, + "__destroy_helper_block_", &CGM.getModule()); + + IdentifierInfo *II + = &CGM.getContext().Idents.get("__destroy_helper_block_"); + + FunctionDecl *FD = FunctionDecl::Create(getContext(), + getContext().getTranslationUnitDecl(), + SourceLocation(), II, R, 0, + FunctionDecl::Static, + FunctionDecl::None, + 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, FunctionType::ExtInfo()); + + CodeGenTypes &Types = CGM.getTypes(); + const llvm::FunctionType *LTy = Types.GetFunctionType(FI, false); + + // FIXME: We'd like to put these into a mergable by content, with + // internal linkage. + llvm::Function *Fn = + llvm::Function::Create(LTy, llvm::GlobalValue::InternalLinkage, + "__Block_byref_id_object_copy_", &CGM.getModule()); + + IdentifierInfo *II + = &CGM.getContext().Idents.get("__Block_byref_id_object_copy_"); + + FunctionDecl *FD = FunctionDecl::Create(getContext(), + getContext().getTranslationUnitDecl(), + SourceLocation(), II, R, 0, + FunctionDecl::Static, + FunctionDecl::None, + 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::getInt32Ty(T->getContext()), 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, FunctionType::ExtInfo()); + + CodeGenTypes &Types = CGM.getTypes(); + const llvm::FunctionType *LTy = Types.GetFunctionType(FI, false); + + // FIXME: We'd like to put these into a mergable by content, with + // internal linkage. + llvm::Function *Fn = + llvm::Function::Create(LTy, llvm::GlobalValue::InternalLinkage, + "__Block_byref_id_object_dispose_", + &CGM.getModule()); + + IdentifierInfo *II + = &CGM.getContext().Idents.get("__Block_byref_id_object_dispose_"); + + FunctionDecl *FD = FunctionDecl::Create(getContext(), + getContext().getTranslationUnitDecl(), + SourceLocation(), II, R, 0, + FunctionDecl::Static, + FunctionDecl::None, + 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, unsigned Align) { + // All alignments below that of pointer alignment collapse down to just + // pointer alignment, as we always have at least that much alignment to begin + // with. + Align /= unsigned(CGF.Target.getPointerAlign(0)/8); + + // As an optimization, we only generate a single function of each kind we + // might need. We need a different one for each alignment and for each + // setting of flags. We mix Align and flag to get the kind. + uint64_t Kind = (uint64_t)Align*BLOCK_BYREF_CURRENT_MAX + Flag; + llvm::Constant *&Entry = CGM.AssignCache[Kind]; + if (Entry) + return Entry; + return Entry = CodeGenFunction(CGM).GeneratebyrefCopyHelperFunction(T, Flag); +} + +llvm::Constant *BlockFunction::BuildbyrefDestroyHelper(const llvm::Type *T, + int Flag, + unsigned Align) { + // All alignments below that of pointer alignment collpase down to just + // pointer alignment, as we always have at least that much alignment to begin + // with. + Align /= unsigned(CGF.Target.getPointerAlign(0)/8); + + // As an optimization, we only generate a single function of each kind we + // might need. We need a different one for each alignment and for each + // setting of flags. We mix Align and flag to get the kind. + uint64_t Kind = (uint64_t)Align*BLOCK_BYREF_CURRENT_MAX + Flag; + llvm::Constant *&Entry = CGM.DestroyCache[Kind]; + if (Entry) + return Entry; + return Entry=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::getVoidTy(VMContext); + ArgTys.push_back(PtrToInt8Ty); + ArgTys.push_back(llvm::Type::getInt32Ty(VMContext)); + 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::getVoidTy(VMContext); + ArgTys.push_back(PtrToInt8Ty); + ArgTys.push_back(PtrToInt8Ty); + ArgTys.push_back(llvm::Type::getInt32Ty(VMContext)); + 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::getInt32Ty(V->getContext()), 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), VMContext(cgm.getLLVMContext()), Builder(B) { + PtrToInt8Ty = llvm::PointerType::getUnqual( + llvm::Type::getInt8Ty(VMContext)); + + BlockHasCopyDispose = false; +} |
