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//===-- CGBlocks.h - state for LLVM CodeGen for blocks ----------*- C++ -*-===//
//
// The LLVM Compiler Infrastructure
//
// This file is distributed under the University of Illinois Open Source
// License. See LICENSE.TXT for details.
//
//===----------------------------------------------------------------------===//
//
// This is the internal state used for llvm translation for block literals.
//
//===----------------------------------------------------------------------===//
#ifndef CLANG_CODEGEN_CGBLOCKS_H
#define CLANG_CODEGEN_CGBLOCKS_H
#include "CodeGenTypes.h"
#include "clang/AST/Type.h"
#include "llvm/Module.h"
#include "llvm/ADT/SmallVector.h"
#include "clang/Basic/TargetInfo.h"
#include "clang/AST/CharUnits.h"
#include "clang/AST/Expr.h"
#include "clang/AST/ExprCXX.h"
#include "clang/AST/ExprObjC.h"
#include <vector>
#include <map>
#include "CGBuilder.h"
#include "CGCall.h"
#include "CGValue.h"
namespace llvm {
class Module;
class Constant;
class Function;
class GlobalValue;
class TargetData;
class FunctionType;
class PointerType;
class Value;
class LLVMContext;
}
namespace clang {
namespace CodeGen {
class CodeGenModule;
class BlockBase {
public:
enum {
BLOCK_HAS_COPY_DISPOSE = (1 << 25),
BLOCK_HAS_CXX_OBJ = (1 << 26),
BLOCK_IS_GLOBAL = (1 << 28),
BLOCK_USE_STRET = (1 << 29),
BLOCK_HAS_SIGNATURE = (1 << 30)
};
};
class BlockModule : public BlockBase {
ASTContext &Context;
llvm::Module &TheModule;
const llvm::TargetData &TheTargetData;
CodeGenTypes &Types;
CodeGenModule &CGM;
llvm::LLVMContext &VMContext;
ASTContext &getContext() const { return Context; }
llvm::Module &getModule() const { return TheModule; }
CodeGenTypes &getTypes() { return Types; }
const llvm::TargetData &getTargetData() const { return TheTargetData; }
public:
int getGlobalUniqueCount() { return ++Block.GlobalUniqueCount; }
const llvm::Type *getBlockDescriptorType();
const llvm::Type *getGenericBlockLiteralType();
llvm::Constant *GetAddrOfGlobalBlock(const BlockExpr *BE, const char *);
const llvm::Type *BlockDescriptorType;
const llvm::Type *GenericBlockLiteralType;
struct {
int GlobalUniqueCount;
} Block;
const llvm::PointerType *PtrToInt8Ty;
std::map<uint64_t, llvm::Constant *> AssignCache;
std::map<uint64_t, llvm::Constant *> DestroyCache;
BlockModule(ASTContext &C, llvm::Module &M, const llvm::TargetData &TD,
CodeGenTypes &T, CodeGenModule &CodeGen)
: Context(C), TheModule(M), TheTargetData(TD), Types(T),
CGM(CodeGen), VMContext(M.getContext()),
BlockDescriptorType(0), GenericBlockLiteralType(0) {
Block.GlobalUniqueCount = 0;
PtrToInt8Ty = llvm::Type::getInt8PtrTy(M.getContext());
}
bool BlockRequiresCopying(QualType Ty)
{ return getContext().BlockRequiresCopying(Ty); }
};
class BlockFunction : public BlockBase {
CodeGenModule &CGM;
ASTContext &getContext() const;
protected:
llvm::LLVMContext &VMContext;
public:
CodeGenFunction &CGF;
const llvm::PointerType *PtrToInt8Ty;
struct HelperInfo {
int index;
int flag;
bool RequiresCopying;
};
enum {
BLOCK_FIELD_IS_OBJECT = 3, /* id, NSObject, __attribute__((NSObject)),
block, ... */
BLOCK_FIELD_IS_BLOCK = 7, /* a block variable */
BLOCK_FIELD_IS_BYREF = 8, /* the on stack structure holding the __block
variable */
BLOCK_FIELD_IS_WEAK = 16, /* declared __weak, only used in byref copy
helpers */
BLOCK_BYREF_CALLER = 128, /* called from __block (byref) copy/dispose
support routines */
BLOCK_BYREF_CURRENT_MAX = 256
};
CGBuilderTy &Builder;
BlockFunction(CodeGenModule &cgm, CodeGenFunction &cgf, CGBuilderTy &B);
/// BlockOffset - The offset in bytes for the next allocation of an
/// imported block variable.
CharUnits BlockOffset;
/// BlockAlign - Maximal alignment needed for the Block expressed in
/// characters.
CharUnits BlockAlign;
/// getBlockOffset - Allocate a location within the block's storage
/// for a value with the given size and alignment requirements.
CharUnits getBlockOffset(CharUnits Size, CharUnits Align);
/// BlockHasCopyDispose - True iff the block uses copy/dispose.
bool BlockHasCopyDispose;
/// BlockLayout - The layout of the block's storage, represented as
/// a sequence of expressions which require such storage. The
/// expressions can be:
/// - a BlockDeclRefExpr, indicating that the given declaration
/// from an enclosing scope is needed by the block;
/// - a DeclRefExpr, which always wraps an anonymous VarDecl with
/// array type, used to insert padding into the block; or
/// - a CXXThisExpr, indicating that the C++ 'this' value should
/// propagate from the parent to the block.
/// This is a really silly representation.
llvm::SmallVector<const Expr *, 8> BlockLayout;
/// BlockDecls - Offsets for all Decls in BlockDeclRefExprs.
llvm::DenseMap<const Decl*, CharUnits> BlockDecls;
/// BlockCXXThisOffset - The offset of the C++ 'this' value within
/// the block structure.
CharUnits BlockCXXThisOffset;
ImplicitParamDecl *BlockStructDecl;
ImplicitParamDecl *getBlockStructDecl() { return BlockStructDecl; }
llvm::Constant *GenerateCopyHelperFunction(bool, const llvm::StructType *,
std::vector<HelperInfo> *);
llvm::Constant *GenerateDestroyHelperFunction(bool, const llvm::StructType *,
std::vector<HelperInfo> *);
llvm::Constant *BuildCopyHelper(const llvm::StructType *,
std::vector<HelperInfo> *);
llvm::Constant *BuildDestroyHelper(const llvm::StructType *,
std::vector<HelperInfo> *);
llvm::Constant *GeneratebyrefCopyHelperFunction(const llvm::Type *, int flag);
llvm::Constant *GeneratebyrefDestroyHelperFunction(const llvm::Type *T, int);
llvm::Constant *BuildbyrefCopyHelper(const llvm::Type *T, int flag,
unsigned Align);
llvm::Constant *BuildbyrefDestroyHelper(const llvm::Type *T, int flag,
unsigned Align);
void BuildBlockRelease(llvm::Value *DeclPtr, int flag = BLOCK_FIELD_IS_BYREF);
bool BlockRequiresCopying(QualType Ty)
{ return getContext().BlockRequiresCopying(Ty); }
};
} // end namespace CodeGen
} // end namespace clang
#endif
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