1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
|
//===-- 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/DenseMap.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 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:
llvm::Constant *getNSConcreteGlobalBlock();
llvm::Constant *getNSConcreteStackBlock();
int getGlobalUniqueCount() { return ++Block.GlobalUniqueCount; }
const llvm::Type *getBlockDescriptorType();
const llvm::Type *getGenericBlockLiteralType();
llvm::Constant *GetAddrOfGlobalBlock(const BlockExpr *BE, const char *);
/// NSConcreteGlobalBlock - Cached reference to the class pointer for global
/// blocks.
llvm::Constant *NSConcreteGlobalBlock;
/// NSConcreteStackBlock - Cached reference to the class poinnter for stack
/// blocks.
llvm::Constant *NSConcreteStackBlock;
const llvm::Type *BlockDescriptorType;
const llvm::Type *GenericBlockLiteralType;
struct {
int GlobalUniqueCount;
} Block;
llvm::Value *BlockObjectAssign;
llvm::Value *BlockObjectDispose;
const llvm::Type *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()),
NSConcreteGlobalBlock(0), NSConcreteStackBlock(0), BlockDescriptorType(0),
GenericBlockLiteralType(0),
BlockObjectAssign(0), BlockObjectDispose(0) {
Block.GlobalUniqueCount = 0;
PtrToInt8Ty = llvm::Type::getInt8PtrTy(M.getContext());
}
bool BlockRequiresCopying(QualType Ty)
{ return getContext().BlockRequiresCopying(Ty); }
};
class BlockFunction : public BlockBase {
CodeGenModule &CGM;
CodeGenFunction &CGF;
ASTContext &getContext() const;
protected:
llvm::LLVMContext &VMContext;
public:
const llvm::Type *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
};
/// BlockInfo - Information to generate a block literal.
struct BlockInfo {
/// BlockLiteralTy - The type of the block literal.
const llvm::Type *BlockLiteralTy;
/// Name - the name of the function this block was created for, if any.
const char *Name;
/// ByCopyDeclRefs - Variables from parent scopes that have been imported
/// into this block.
llvm::SmallVector<const BlockDeclRefExpr *, 8> DeclRefs;
BlockInfo(const llvm::Type *blt, const char *n)
: BlockLiteralTy(blt), Name(n) {
// Skip asm prefix, if any.
if (Name && Name[0] == '\01')
++Name;
}
};
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 an offset for the ValueDecl from a
/// BlockDeclRefExpr in a block literal (BlockExpr).
CharUnits getBlockOffset(const BlockDeclRefExpr *E);
/// BlockHasCopyDispose - True iff the block uses copy/dispose.
bool BlockHasCopyDispose;
/// BlockDeclRefDecls - Decls from BlockDeclRefExprs in apperance order
/// in a block literal. Decls without names are used for padding.
llvm::SmallVector<const Expr *, 8> BlockDeclRefDecls;
/// BlockDecls - Offsets for all Decls in BlockDeclRefExprs.
std::map<const Decl*, CharUnits> BlockDecls;
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);
llvm::Value *getBlockObjectAssign();
llvm::Value *getBlockObjectDispose();
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
|
