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
|
//===--- TypeLocBuilder.h - Type Source Info collector ----------*- C++ -*-===//
//
// The LLVM Compiler Infrastructure
//
// This file is distributed under the University of Illinois Open Source
// License. See LICENSE.TXT for details.
//
//===----------------------------------------------------------------------===//
//
// This file defines TypeLocBuilder, a class for building TypeLocs
// bottom-up.
//
//===----------------------------------------------------------------------===//
#ifndef LLVM_CLANG_LIB_SEMA_TYPELOCBUILDER_H
#define LLVM_CLANG_LIB_SEMA_TYPELOCBUILDER_H
#include "clang/AST/ASTContext.h"
#include "clang/AST/TypeLoc.h"
namespace clang {
class TypeLocBuilder {
enum { InlineCapacity = 8 * sizeof(SourceLocation) };
/// The underlying location-data buffer. Data grows from the end
/// of the buffer backwards.
char *Buffer;
/// The capacity of the current buffer.
size_t Capacity;
/// The index of the first occupied byte in the buffer.
size_t Index;
#ifndef NDEBUG
/// The last type pushed on this builder.
QualType LastTy;
#endif
/// The inline buffer.
enum { BufferMaxAlignment = alignof(void *) };
llvm::AlignedCharArray<BufferMaxAlignment, InlineCapacity> InlineBuffer;
unsigned NumBytesAtAlign4, NumBytesAtAlign8;
public:
TypeLocBuilder()
: Buffer(InlineBuffer.buffer), Capacity(InlineCapacity),
Index(InlineCapacity), NumBytesAtAlign4(0), NumBytesAtAlign8(0)
{
}
~TypeLocBuilder() {
if (Buffer != InlineBuffer.buffer)
delete[] Buffer;
}
/// Ensures that this buffer has at least as much capacity as described.
void reserve(size_t Requested) {
if (Requested > Capacity)
// For now, match the request exactly.
grow(Requested);
}
/// Pushes a copy of the given TypeLoc onto this builder. The builder
/// must be empty for this to work.
void pushFullCopy(TypeLoc L);
/// Pushes space for a typespec TypeLoc. Invalidates any TypeLocs
/// previously retrieved from this builder.
TypeSpecTypeLoc pushTypeSpec(QualType T) {
size_t LocalSize = TypeSpecTypeLoc::LocalDataSize;
unsigned LocalAlign = TypeSpecTypeLoc::LocalDataAlignment;
return pushImpl(T, LocalSize, LocalAlign).castAs<TypeSpecTypeLoc>();
}
/// Resets this builder to the newly-initialized state.
void clear() {
#ifndef NDEBUG
LastTy = QualType();
#endif
Index = Capacity;
NumBytesAtAlign4 = NumBytesAtAlign8 = 0;
}
/// \brief Tell the TypeLocBuilder that the type it is storing has been
/// modified in some safe way that doesn't affect type-location information.
void TypeWasModifiedSafely(QualType T) {
#ifndef NDEBUG
LastTy = T;
#endif
}
/// Pushes space for a new TypeLoc of the given type. Invalidates
/// any TypeLocs previously retrieved from this builder.
template <class TyLocType> TyLocType push(QualType T) {
TyLocType Loc = TypeLoc(T, nullptr).castAs<TyLocType>();
size_t LocalSize = Loc.getLocalDataSize();
unsigned LocalAlign = Loc.getLocalDataAlignment();
return pushImpl(T, LocalSize, LocalAlign).castAs<TyLocType>();
}
/// Creates a TypeSourceInfo for the given type.
TypeSourceInfo *getTypeSourceInfo(ASTContext& Context, QualType T) {
#ifndef NDEBUG
assert(T == LastTy && "type doesn't match last type pushed!");
#endif
size_t FullDataSize = Capacity - Index;
TypeSourceInfo *DI = Context.CreateTypeSourceInfo(T, FullDataSize);
memcpy(DI->getTypeLoc().getOpaqueData(), &Buffer[Index], FullDataSize);
return DI;
}
/// \brief Copies the type-location information to the given AST context and
/// returns a \c TypeLoc referring into the AST context.
TypeLoc getTypeLocInContext(ASTContext &Context, QualType T) {
#ifndef NDEBUG
assert(T == LastTy && "type doesn't match last type pushed!");
#endif
size_t FullDataSize = Capacity - Index;
void *Mem = Context.Allocate(FullDataSize);
memcpy(Mem, &Buffer[Index], FullDataSize);
return TypeLoc(T, Mem);
}
private:
TypeLoc pushImpl(QualType T, size_t LocalSize, unsigned LocalAlignment);
/// Grow to the given capacity.
void grow(size_t NewCapacity);
/// \brief Retrieve a temporary TypeLoc that refers into this \c TypeLocBuilder
/// object.
///
/// The resulting \c TypeLoc should only be used so long as the
/// \c TypeLocBuilder is active and has not had more type information
/// pushed into it.
TypeLoc getTemporaryTypeLoc(QualType T) {
#ifndef NDEBUG
assert(LastTy == T && "type doesn't match last type pushed!");
#endif
return TypeLoc(T, &Buffer[Index]);
}
};
}
#endif
|
