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llvm-project/clang/lib/CodeGen/CGBlocks.cpp
John McCall bd30929e4d Validated by nightly-test runs on x86 and x86-64 darwin, including after 
self-host.  Hopefully these results hold up on different platforms.  

I tried to keep the GNU ObjC runtime happy, but it's hard for me to test.
Reimplement how clang generates IR for exceptions.  Instead of creating new
invoke destinations which sequentially chain to the previous destination,
push a more semantic representation of *why* we need the cleanup/catch/filter
behavior, then collect that information into a single landing pad upon request.

Also reorganizes how normal cleanups (i.e. cleanups triggered by non-exceptional
control flow) are generated, since it's actually fairly closely tied in with
the former.  Remove the need to track which cleanup scope a block is associated
with.

Document a lot of previously poorly-understood (by me, at least) behavior.

The new framework implements the Horrible Hack (tm), which requires every
landing pad to have a catch-all so that inlining will work.  Clang no longer
requires the Horrible Hack just to make exceptions flow correctly within
a function, however.  The HH is an unfortunate requirement of LLVM's EH IR.

llvm-svn: 107631
2010-07-06 01:34:17 +00:00

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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 "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(CurGD, 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 if (BDRE && BDRE->getDecl()->getType()->isReferenceType()) {
Types[i+BlockFields] = llvm::PointerType::get(ConvertType(Ty), 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 {
if (BDRE->getCopyConstructorExpr()) {
E = BDRE->getCopyConstructorExpr();
PushDestructorCleanup(E->getType(), Addr);
}
else {
E = new (getContext()) DeclRefExpr(const_cast<ValueDecl*>(VD),
VD->getType().getNonReferenceType(),
SourceLocation());
if (VD->getType()->isReferenceType()) {
E = new (getContext())
UnaryOperator(const_cast<Expr*>(E), UnaryOperator::AddrOf,
getContext().getPointerType(E->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(Int64Ty, 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(Int64Ty, 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);
if (VD->getType()->isReferenceType())
V = Builder.CreateLoad(V, "ref.tmp");
}
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(GlobalDecl(), 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(GlobalDecl GD, 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(GD, Name, BD);
llvm::Function *Fn =
llvm::Function::Create(LTy, llvm::GlobalValue::InternalLinkage,
Name.getString(), &CGM.getModule());
CGM.SetInternalFunctionAttributes(BD, Fn, FI);
QualType FnType(BlockFunctionType, 0);
bool HasPrototype = isa<FunctionProtoType>(BlockFunctionType);
IdentifierInfo *ID = &getContext().Idents.get(Name.getString());
CurCodeDecl = FunctionDecl::Create(getContext(),
getContext().getTranslationUnitDecl(),
SourceLocation(), ID, FnType,
0,
FunctionDecl::Static,
FunctionDecl::None,
false, HasPrototype);
StartFunction(BD, ResultType, Fn, Args,
BExpr->getBody()->getLocEnd());
CurFuncDecl = OuterFuncDecl;
// 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(CGF.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, 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(CGF.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, 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(CGF.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::getVoidTy(VMContext);
ArgTys.push_back(PtrToInt8Ty);
ArgTys.push_back(PtrToInt8Ty);
ArgTys.push_back(CGF.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(CGF.Int32Ty, flag);
Builder.CreateCall2(F, V, N);
}
ASTContext &BlockFunction::getContext() const { return CGM.getContext(); }
BlockFunction::BlockFunction(CodeGenModule &cgm, CodeGenFunction &cgf,
CGBuilderTy &B)
: CGM(cgm), VMContext(cgm.getLLVMContext()), CGF(cgf), Builder(B) {
PtrToInt8Ty = llvm::PointerType::getUnqual(
llvm::Type::getInt8Ty(VMContext));
BlockHasCopyDispose = false;
}
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