forked from OSchip/llvm-project
202 lines
5.7 KiB
C++
202 lines
5.7 KiB
C++
//===-- CGBlocks.h - state for LLVM CodeGen for blocks ----------*- C++ -*-===//
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//
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// The LLVM Compiler Infrastructure
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//
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// This file is distributed under the University of Illinois Open Source
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// License. See LICENSE.TXT for details.
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//
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//===----------------------------------------------------------------------===//
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//
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// This is the internal state used for llvm translation for block literals.
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//
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//===----------------------------------------------------------------------===//
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#ifndef CLANG_CODEGEN_CGBLOCKS_H
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#define CLANG_CODEGEN_CGBLOCKS_H
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#include "CodeGenTypes.h"
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#include "clang/AST/Type.h"
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#include "llvm/Module.h"
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#include "llvm/ADT/SmallVector.h"
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#include "clang/Basic/TargetInfo.h"
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#include "clang/AST/CharUnits.h"
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#include "clang/AST/Expr.h"
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#include "clang/AST/ExprCXX.h"
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#include "clang/AST/ExprObjC.h"
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#include "CGBuilder.h"
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#include "CGCall.h"
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#include "CGValue.h"
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namespace llvm {
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class Module;
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class Constant;
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class Function;
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class GlobalValue;
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class TargetData;
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class FunctionType;
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class PointerType;
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class Value;
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class LLVMContext;
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}
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namespace clang {
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namespace CodeGen {
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class CodeGenModule;
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class CGBlockInfo;
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enum BlockFlag_t {
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BLOCK_HAS_COPY_DISPOSE = (1 << 25),
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BLOCK_HAS_CXX_OBJ = (1 << 26),
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BLOCK_IS_GLOBAL = (1 << 28),
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BLOCK_USE_STRET = (1 << 29),
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BLOCK_HAS_SIGNATURE = (1 << 30)
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};
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class BlockFlags {
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uint32_t flags;
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BlockFlags(uint32_t flags) : flags(flags) {}
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public:
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BlockFlags() : flags(0) {}
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BlockFlags(BlockFlag_t flag) : flags(flag) {}
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uint32_t getBitMask() const { return flags; }
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bool empty() const { return flags == 0; }
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friend BlockFlags operator|(BlockFlags l, BlockFlags r) {
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return BlockFlags(l.flags | r.flags);
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}
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friend BlockFlags &operator|=(BlockFlags &l, BlockFlags r) {
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l.flags |= r.flags;
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return l;
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}
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friend bool operator&(BlockFlags l, BlockFlags r) {
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return (l.flags & r.flags);
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}
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};
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inline BlockFlags operator|(BlockFlag_t l, BlockFlag_t r) {
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return BlockFlags(l) | BlockFlags(r);
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}
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enum BlockFieldFlag_t {
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BLOCK_FIELD_IS_OBJECT = 0x03, /* id, NSObject, __attribute__((NSObject)),
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block, ... */
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BLOCK_FIELD_IS_BLOCK = 0x07, /* a block variable */
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BLOCK_FIELD_IS_BYREF = 0x08, /* the on stack structure holding the __block
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variable */
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BLOCK_FIELD_IS_WEAK = 0x10, /* declared __weak, only used in byref copy
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helpers */
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BLOCK_BYREF_CALLER = 128, /* called from __block (byref) copy/dispose
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support routines */
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BLOCK_BYREF_CURRENT_MAX = 256
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};
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class BlockFieldFlags {
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uint32_t flags;
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BlockFieldFlags(uint32_t flags) : flags(flags) {}
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public:
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BlockFieldFlags() : flags(0) {}
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BlockFieldFlags(BlockFieldFlag_t flag) : flags(flag) {}
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uint32_t getBitMask() const { return flags; }
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bool empty() const { return flags == 0; }
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/// Answers whether the flags indicate that this field is an object
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/// or block pointer that requires _Block_object_assign/dispose.
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bool isSpecialPointer() const { return flags & BLOCK_FIELD_IS_OBJECT; }
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friend BlockFieldFlags operator|(BlockFieldFlags l, BlockFieldFlags r) {
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return BlockFieldFlags(l.flags | r.flags);
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}
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friend BlockFieldFlags &operator|=(BlockFieldFlags &l, BlockFieldFlags r) {
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l.flags |= r.flags;
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return l;
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}
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friend bool operator&(BlockFieldFlags l, BlockFieldFlags r) {
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return (l.flags & r.flags);
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}
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};
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inline BlockFieldFlags operator|(BlockFieldFlag_t l, BlockFieldFlag_t r) {
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return BlockFieldFlags(l) | BlockFieldFlags(r);
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}
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/// CGBlockInfo - Information to generate a block literal.
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class CGBlockInfo {
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public:
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/// Name - The name of the block, kindof.
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const char *Name;
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/// The field index of 'this' within the block, if there is one.
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unsigned CXXThisIndex;
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class Capture {
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uintptr_t Data;
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public:
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bool isIndex() const { return (Data & 1) != 0; }
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bool isConstant() const { return !isIndex(); }
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unsigned getIndex() const { assert(isIndex()); return Data >> 1; }
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llvm::Value *getConstant() const {
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assert(isConstant());
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return reinterpret_cast<llvm::Value*>(Data);
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}
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static Capture makeIndex(unsigned index) {
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Capture v;
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v.Data = (index << 1) | 1;
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return v;
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}
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static Capture makeConstant(llvm::Value *value) {
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Capture v;
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v.Data = reinterpret_cast<uintptr_t>(value);
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return v;
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}
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};
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/// The mapping of allocated indexes within the block.
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llvm::DenseMap<const VarDecl*, Capture> Captures;
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/// CanBeGlobal - True if the block can be global, i.e. it has
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/// no non-constant captures.
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bool CanBeGlobal : 1;
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/// True if the block needs a custom copy or dispose function.
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bool NeedsCopyDispose : 1;
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/// HasCXXObject - True if the block's custom copy/dispose functions
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/// need to be run even in GC mode.
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bool HasCXXObject : 1;
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/// UsesStret : True if the block uses an stret return. Mutable
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/// because it gets set later in the block-creation process.
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mutable bool UsesStret : 1;
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const llvm::StructType *StructureType;
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const BlockExpr *Block;
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CharUnits BlockSize;
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CharUnits BlockAlign;
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const Capture &getCapture(const VarDecl *var) const {
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llvm::DenseMap<const VarDecl*, Capture>::const_iterator
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it = Captures.find(var);
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assert(it != Captures.end() && "no entry for variable!");
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return it->second;
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}
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const BlockDecl *getBlockDecl() const { return Block->getBlockDecl(); }
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const BlockExpr *getBlockExpr() const { return Block; }
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CGBlockInfo(const BlockExpr *blockExpr, const char *Name);
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};
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} // end namespace CodeGen
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} // end namespace clang
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#endif
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