278 lines
8.2 KiB
C++
278 lines
8.2 KiB
C++
//===-- 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 LLVM_CLANG_LIB_CODEGEN_CGBLOCKS_H
|
|
#define LLVM_CLANG_LIB_CODEGEN_CGBLOCKS_H
|
|
|
|
#include "CGBuilder.h"
|
|
#include "CGCall.h"
|
|
#include "CGValue.h"
|
|
#include "CodeGenFunction.h"
|
|
#include "CodeGenTypes.h"
|
|
#include "clang/AST/CharUnits.h"
|
|
#include "clang/AST/Expr.h"
|
|
#include "clang/AST/ExprCXX.h"
|
|
#include "clang/AST/ExprObjC.h"
|
|
#include "clang/AST/Type.h"
|
|
#include "clang/Basic/TargetInfo.h"
|
|
#include "llvm/IR/Module.h"
|
|
|
|
namespace llvm {
|
|
class Module;
|
|
class Constant;
|
|
class Function;
|
|
class GlobalValue;
|
|
class DataLayout;
|
|
class FunctionType;
|
|
class PointerType;
|
|
class Value;
|
|
class LLVMContext;
|
|
}
|
|
|
|
namespace clang {
|
|
|
|
namespace CodeGen {
|
|
|
|
class CodeGenModule;
|
|
class CGBlockInfo;
|
|
|
|
// Flags stored in __block variables.
|
|
enum BlockByrefFlags {
|
|
BLOCK_BYREF_HAS_COPY_DISPOSE = (1 << 25), // compiler
|
|
BLOCK_BYREF_LAYOUT_MASK = (0xF << 28), // compiler
|
|
BLOCK_BYREF_LAYOUT_EXTENDED = (1 << 28),
|
|
BLOCK_BYREF_LAYOUT_NON_OBJECT = (2 << 28),
|
|
BLOCK_BYREF_LAYOUT_STRONG = (3 << 28),
|
|
BLOCK_BYREF_LAYOUT_WEAK = (4 << 28),
|
|
BLOCK_BYREF_LAYOUT_UNRETAINED = (5 << 28)
|
|
};
|
|
|
|
enum BlockLiteralFlags {
|
|
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),
|
|
BLOCK_HAS_EXTENDED_LAYOUT = (1 << 31)
|
|
};
|
|
class BlockFlags {
|
|
uint32_t flags;
|
|
|
|
public:
|
|
BlockFlags(uint32_t flags) : flags(flags) {}
|
|
BlockFlags() : flags(0) {}
|
|
BlockFlags(BlockLiteralFlags flag) : flags(flag) {}
|
|
BlockFlags(BlockByrefFlags flag) : flags(flag) {}
|
|
|
|
uint32_t getBitMask() const { return flags; }
|
|
bool empty() const { return flags == 0; }
|
|
|
|
friend BlockFlags operator|(BlockFlags l, BlockFlags r) {
|
|
return BlockFlags(l.flags | r.flags);
|
|
}
|
|
friend BlockFlags &operator|=(BlockFlags &l, BlockFlags r) {
|
|
l.flags |= r.flags;
|
|
return l;
|
|
}
|
|
friend bool operator&(BlockFlags l, BlockFlags r) {
|
|
return (l.flags & r.flags);
|
|
}
|
|
bool operator==(BlockFlags r) {
|
|
return (flags == r.flags);
|
|
}
|
|
};
|
|
inline BlockFlags operator|(BlockLiteralFlags l, BlockLiteralFlags r) {
|
|
return BlockFlags(l) | BlockFlags(r);
|
|
}
|
|
|
|
enum BlockFieldFlag_t {
|
|
BLOCK_FIELD_IS_OBJECT = 0x03, /* id, NSObject, __attribute__((NSObject)),
|
|
block, ... */
|
|
BLOCK_FIELD_IS_BLOCK = 0x07, /* a block variable */
|
|
|
|
BLOCK_FIELD_IS_BYREF = 0x08, /* the on stack structure holding the __block
|
|
variable */
|
|
BLOCK_FIELD_IS_WEAK = 0x10, /* declared __weak, only used in byref copy
|
|
helpers */
|
|
BLOCK_FIELD_IS_ARC = 0x40, /* field has ARC-specific semantics */
|
|
BLOCK_BYREF_CALLER = 128, /* called from __block (byref) copy/dispose
|
|
support routines */
|
|
BLOCK_BYREF_CURRENT_MAX = 256
|
|
};
|
|
|
|
class BlockFieldFlags {
|
|
uint32_t flags;
|
|
|
|
BlockFieldFlags(uint32_t flags) : flags(flags) {}
|
|
public:
|
|
BlockFieldFlags() : flags(0) {}
|
|
BlockFieldFlags(BlockFieldFlag_t flag) : flags(flag) {}
|
|
|
|
uint32_t getBitMask() const { return flags; }
|
|
bool empty() const { return flags == 0; }
|
|
|
|
/// Answers whether the flags indicate that this field is an object
|
|
/// or block pointer that requires _Block_object_assign/dispose.
|
|
bool isSpecialPointer() const { return flags & BLOCK_FIELD_IS_OBJECT; }
|
|
|
|
friend BlockFieldFlags operator|(BlockFieldFlags l, BlockFieldFlags r) {
|
|
return BlockFieldFlags(l.flags | r.flags);
|
|
}
|
|
friend BlockFieldFlags &operator|=(BlockFieldFlags &l, BlockFieldFlags r) {
|
|
l.flags |= r.flags;
|
|
return l;
|
|
}
|
|
friend bool operator&(BlockFieldFlags l, BlockFieldFlags r) {
|
|
return (l.flags & r.flags);
|
|
}
|
|
};
|
|
inline BlockFieldFlags operator|(BlockFieldFlag_t l, BlockFieldFlag_t r) {
|
|
return BlockFieldFlags(l) | BlockFieldFlags(r);
|
|
}
|
|
|
|
/// Information about the layout of a __block variable.
|
|
class BlockByrefInfo {
|
|
public:
|
|
llvm::StructType *Type;
|
|
unsigned FieldIndex;
|
|
CharUnits ByrefAlignment;
|
|
CharUnits FieldOffset;
|
|
};
|
|
|
|
/// CGBlockInfo - Information to generate a block literal.
|
|
class CGBlockInfo {
|
|
public:
|
|
/// Name - The name of the block, kindof.
|
|
StringRef Name;
|
|
|
|
/// The field index of 'this' within the block, if there is one.
|
|
unsigned CXXThisIndex;
|
|
|
|
class Capture {
|
|
uintptr_t Data;
|
|
EHScopeStack::stable_iterator Cleanup;
|
|
CharUnits::QuantityType Offset;
|
|
|
|
public:
|
|
bool isIndex() const { return (Data & 1) != 0; }
|
|
bool isConstant() const { return !isIndex(); }
|
|
|
|
unsigned getIndex() const {
|
|
assert(isIndex());
|
|
return Data >> 1;
|
|
}
|
|
CharUnits getOffset() const {
|
|
assert(isIndex());
|
|
return CharUnits::fromQuantity(Offset);
|
|
}
|
|
EHScopeStack::stable_iterator getCleanup() const {
|
|
assert(isIndex());
|
|
return Cleanup;
|
|
}
|
|
void setCleanup(EHScopeStack::stable_iterator cleanup) {
|
|
assert(isIndex());
|
|
Cleanup = cleanup;
|
|
}
|
|
|
|
llvm::Value *getConstant() const {
|
|
assert(isConstant());
|
|
return reinterpret_cast<llvm::Value*>(Data);
|
|
}
|
|
|
|
static Capture makeIndex(unsigned index, CharUnits offset) {
|
|
Capture v;
|
|
v.Data = (index << 1) | 1;
|
|
v.Offset = offset.getQuantity();
|
|
return v;
|
|
}
|
|
|
|
static Capture makeConstant(llvm::Value *value) {
|
|
Capture v;
|
|
v.Data = reinterpret_cast<uintptr_t>(value);
|
|
return v;
|
|
}
|
|
};
|
|
|
|
/// CanBeGlobal - True if the block can be global, i.e. it has
|
|
/// no non-constant captures.
|
|
bool CanBeGlobal : 1;
|
|
|
|
/// True if the block needs a custom copy or dispose function.
|
|
bool NeedsCopyDispose : 1;
|
|
|
|
/// HasCXXObject - True if the block's custom copy/dispose functions
|
|
/// need to be run even in GC mode.
|
|
bool HasCXXObject : 1;
|
|
|
|
/// UsesStret : True if the block uses an stret return. Mutable
|
|
/// because it gets set later in the block-creation process.
|
|
mutable bool UsesStret : 1;
|
|
|
|
/// HasCapturedVariableLayout : True if block has captured variables
|
|
/// and their layout meta-data has been generated.
|
|
bool HasCapturedVariableLayout : 1;
|
|
|
|
/// The mapping of allocated indexes within the block.
|
|
llvm::DenseMap<const VarDecl*, Capture> Captures;
|
|
|
|
Address LocalAddress;
|
|
llvm::StructType *StructureType;
|
|
const BlockDecl *Block;
|
|
const BlockExpr *BlockExpression;
|
|
CharUnits BlockSize;
|
|
CharUnits BlockAlign;
|
|
CharUnits CXXThisOffset;
|
|
|
|
// Offset of the gap caused by block header having a smaller
|
|
// alignment than the alignment of the block descriptor. This
|
|
// is the gap offset before the first capturued field.
|
|
CharUnits BlockHeaderForcedGapOffset;
|
|
// Gap size caused by aligning first field after block header.
|
|
// This could be zero if no forced alignment is required.
|
|
CharUnits BlockHeaderForcedGapSize;
|
|
|
|
/// An instruction which dominates the full-expression that the
|
|
/// block is inside.
|
|
llvm::Instruction *DominatingIP;
|
|
|
|
/// The next block in the block-info chain. Invalid if this block
|
|
/// info is not part of the CGF's block-info chain, which is true
|
|
/// if it corresponds to a global block or a block whose expression
|
|
/// has been encountered.
|
|
CGBlockInfo *NextBlockInfo;
|
|
|
|
const Capture &getCapture(const VarDecl *var) const {
|
|
return const_cast<CGBlockInfo*>(this)->getCapture(var);
|
|
}
|
|
Capture &getCapture(const VarDecl *var) {
|
|
llvm::DenseMap<const VarDecl*, Capture>::iterator
|
|
it = Captures.find(var);
|
|
assert(it != Captures.end() && "no entry for variable!");
|
|
return it->second;
|
|
}
|
|
|
|
const BlockDecl *getBlockDecl() const { return Block; }
|
|
const BlockExpr *getBlockExpr() const {
|
|
assert(BlockExpression);
|
|
assert(BlockExpression->getBlockDecl() == Block);
|
|
return BlockExpression;
|
|
}
|
|
|
|
CGBlockInfo(const BlockDecl *blockDecl, StringRef Name);
|
|
};
|
|
|
|
} // end namespace CodeGen
|
|
} // end namespace clang
|
|
|
|
#endif
|