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clang-1/lib/CodeGen/CGBlocks.cpp

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//===--- 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 "CodeGenModule.h"
#include "clang/AST/DeclObjC.h"
#include "llvm/Module.h"
#include "llvm/Target/TargetData.h"
#include <algorithm>
#include <cstdio>
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(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, CodeGenFunction::BlockInfo &Info,
llvm::SmallSet<const DeclContext *, 16> &InnerContexts) {
for (Stmt::const_child_iterator I = S->child_begin(), E = S->child_end();
I != E; ++I)
if (*I)
CollectBlockDeclRefInfo(*I, Info, InnerContexts);
// 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)) {
InnerContexts.insert(cast<DeclContext>(BE->getBlockDecl()));
CollectBlockDeclRefInfo(BE->getBody(), Info, InnerContexts);
}
if (const BlockDeclRefExpr *BDRE = dyn_cast<BlockDeclRefExpr>(S)) {
// FIXME: Handle enums.
if (isa<FunctionDecl>(BDRE->getDecl()))
return;
// Only Decls that escape are added.
if (!InnerContexts.count(BDRE->getDecl()->getDeclContext()))
Info.DeclRefs.push_back(BDRE);
}
}
/// 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.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(const CodeGenFunction::BlockInfo &Info,
CodeGenFunction *CGF) {
// Always allocate self, as it is often handy in the debugger, even if there
// is no codegen in the block that uses it. This is also useful to always do
// this as if we didn't, we'd have to figure out all code that uses a self
// pointer, including implicit uses.
if (const ObjCMethodDecl *OMD
= dyn_cast_or_null<ObjCMethodDecl>(CGF->CurFuncDecl)) {
ImplicitParamDecl *SelfDecl = OMD->getSelfDecl();
BlockDeclRefExpr *BDRE = new (CGF->getContext())
BlockDeclRefExpr(SelfDecl,
SelfDecl->getType(), SourceLocation(), false);
CGF->AllocateBlockDecl(BDRE);
}
// FIXME: Also always forward the this pointer in C++ as well.
for (size_t i = 0; i < Info.DeclRefs.size(); ++i)
CGF->AllocateBlockDecl(Info.DeclRefs[i]);
}
// 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());
llvm::SmallSet<const DeclContext *, 16> InnerContexts;
InnerContexts.insert(BE->getBlockDecl());
CollectBlockDeclRefInfo(BE->getBody(), Info, InnerContexts);
// 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;
bool hasIntrospection = CGM.getContext().getLangOptions().BlockIntrospection;
if (hasIntrospection) {
BlockFields++;
}
std::vector<llvm::Constant*> Elts(BlockFields);
if (hasIntrospection) {
std::string BlockTypeEncoding;
CGM.getContext().getObjCEncodingForBlock(BE, BlockTypeEncoding);
Elts[5] = llvm::ConstantExpr::getBitCast(
CGM.GetAddrOfConstantCString(BlockTypeEncoding), PtrToInt8Ty);
}
llvm::Constant *C;
llvm::Value *V;
{
// C = BuildBlockStructInitlist();
unsigned int flags = BLOCK_HAS_DESCRIPTOR;
if (hasIntrospection)
flags |= BLOCK_HAS_OBJC_TYPE;
// 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(VMContext, Elts, false);
char Name[32];
sprintf(Name, "__block_holder_tmp_%d", CGM.getGlobalUniqueCount());
C = new llvm::GlobalVariable(CGM.getModule(), C->getType(), true,
llvm::GlobalValue::InternalLinkage,
C, Name);
QualType BPT = BE->getType();
C = llvm::ConstantExpr::getBitCast(C, ConvertType(BPT));
return C;
}
std::vector<const llvm::Type *> Types(BlockFields+subBlockDeclRefDecls.size());
for (int i=0; i<4; ++i)
Types[i] = Elts[i]->getType();
Types[4] = PtrToInt8Ty;
if (hasIntrospection)
Types[5] = 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()) {
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(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"));
if (hasIntrospection)
Builder.CreateStore(Elts[5], Builder.CreateStructGEP(V, 5, "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+BlockFields, "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);
llvm::Value *Loc = LocalDeclMap[VD];
Loc = Builder.CreateStructGEP(Loc, 1, "forwarding");
Loc = Builder.CreateLoad(Loc);
Builder.CreateStore(Loc, Addr);
++helpersize;
continue;
} else
E = new (getContext()) DeclRefExpr (VD,
VD->getType(),
SourceLocation());
}
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+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.
uint64_t offset = BlockDecls[BDRE->getDecl()];
llvm::Value *BlockLiteral = LoadBlockStruct();
Loc = Builder.CreateGEP(BlockLiteral,
llvm::ConstantInt::get(llvm::Type::getInt64Ty(VMContext),
offset),
"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(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->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;
// // GNU runtime only:
// const char *types;
// };
if (CGM.getContext().getLangOptions().BlockIntrospection)
GenericBlockLiteralType = llvm::StructType::get(IntTy->getContext(),
PtrToInt8Ty,
IntTy,
IntTy,
PtrToInt8Ty,
BlockDescPtrTy,
PtrToInt8Ty,
NULL);
else
GenericBlockLiteralType = llvm::StructType::get(IntTy->getContext(),
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(IntTy->getContext(),
PtrToInt8Ty,
IntTy,
IntTy,
PtrToInt8Ty,
BlockDescPtrTy,
PtrToInt8Ty,
PtrToInt8Ty,
NULL);
getModule().addTypeName("struct.__block_literal_extended_generic",
GenericExtendedBlockLiteralType);
return GenericExtendedBlockLiteralType;
}
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");
QualType ResultType = FnType->getAs<FunctionType>()->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, ReturnValue, Args);
}
uint64_t CodeGenFunction::AllocateBlockDecl(const BlockDeclRefExpr *E) {
const ValueDecl *VD = E->getDecl();
uint64_t &offset = BlockDecls[VD];
// See if we have already allocated an offset for this variable.
if (offset)
return offset;
// Don't run the expensive check, unless we have to.
if (!BlockHasCopyDispose)
if (E->isByRef()
|| BlockRequiresCopying(E->getType()))
BlockHasCopyDispose = true;
// if not, allocate one now.
offset = getBlockOffset(E);
return offset;
}
llvm::Value *CodeGenFunction::GetAddrOfBlockDecl(const BlockDeclRefExpr *E) {
const ValueDecl *VD = E->getDecl();
uint64_t offset = AllocateBlockDecl(E);
llvm::Value *BlockLiteral = LoadBlockStruct();
llvm::Value *V = Builder.CreateGEP(BlockLiteral,
llvm::ConstantInt::get(llvm::Type::getInt64Ty(VMContext),
offset),
"block.literal");
if (E->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());
} else {
const llvm::Type *Ty = CGM.getTypes().ConvertType(VD->getType());
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(VMContext, &DescriptorFields[0], 2, 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.
if (CGM.getContext().getLangOptions().BlockIntrospection)
FieldCount = 6;
std::vector<llvm::Constant*> LiteralFields(FieldCount);
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] = CGM.getContext().getLangOptions().BlockIntrospection ?
llvm::ConstantInt::get(IntTy, BLOCK_IS_GLOBAL | BLOCK_HAS_DESCRIPTOR |
BLOCK_HAS_OBJC_TYPE) :
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;
// Type encoding
if (CGM.getContext().getLangOptions().BlockIntrospection) {
std::string BlockTypeEncoding;
CGM.getContext().getObjCEncodingForBlock(BE, BlockTypeEncoding);
LiteralFields[5] = CGM.GetAddrOfConstantCString(BlockTypeEncoding);
}
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,
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;
}
BlockOffset = CGM.getTargetData()
.getTypeStoreSizeInBits(CGM.getGenericBlockLiteralType()) / 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;
CurFuncDecl = OuterFuncDecl;
const BlockDecl *BD = BExpr->getBlockDecl();
IdentifierInfo *II = &CGM.getContext().Idents.get(".block_descriptor");
// Allocate all BlockDeclRefDecls, so we can calculate the right ParmTy below.
AllocateAllBlockDeclRefs(Info, this);
QualType ParmTy = getContext().getBlockParmType(BlockHasCopyDispose,
BlockDeclRefDecls);
// FIXME: This leaks
ImplicitParamDecl *SelfDecl =
ImplicitParamDecl::Create(getContext(), 0,
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);
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;
// 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.
for (unsigned i=0; i < BlockDeclRefDecls.size(); ++i) {
const Expr *E = BlockDeclRefDecls[i];
const BlockDeclRefExpr *BDRE = dyn_cast<BlockDeclRefExpr>(E);
if (BDRE) {
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 *.
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::getInt8Ty(VMContext), Pad);
QualType PadTy = getContext().getConstantArrayType(getContext().CharTy,
llvm::APInt(32, Pad),
ArrayType::Normal, 0);
ValueDecl *PadDecl = VarDecl::Create(getContext(), 0, SourceLocation(),
0, QualType(PadTy), 0, VarDecl::None);
Expr *E;
E = new (getContext()) DeclRefExpr(PadDecl, PadDecl->getType(),
SourceLocation());
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);
// FIXME: We'd like to put these into a mergable by content, with
// internal linkage.
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, 0,
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::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);
// FIXME: We'd like to put these into a mergable by content, with
// internal linkage.
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, 0,
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);
// 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,
Name,
&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, 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);
std::string Name = std::string("__Block_byref_id_object_dispose_");
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,
Name,
&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, 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;
}
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