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
|
//===--- Utility.h -------------------*- mode:c++;eval:(read-only-mode) -*-===//
// Do not edit! See README.txt.
// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
// See https://llvm.org/LICENSE.txt for license information.
// SPDX-FileCopyrightText: Part of the LLVM Project
// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
//
//===----------------------------------------------------------------------===//
//
// Provide some utility classes for use in the demangler.
// There are two copies of this file in the source tree. The one in libcxxabi
// is the original and the one in llvm is the copy. Use cp-to-llvm.sh to update
// the copy. See README.txt for more details.
//
//===----------------------------------------------------------------------===//
#ifndef DEMANGLE_UTILITY_H
#define DEMANGLE_UTILITY_H
#include "DemangleConfig.h"
#include <array>
#include <cassert>
#include <cstdint>
#include <cstdlib>
#include <cstring>
#include <exception>
#include <limits>
#include <string_view>
DEMANGLE_NAMESPACE_BEGIN
// Stream that AST nodes write their string representation into after the AST
// has been parsed.
class OutputBuffer {
char *Buffer = nullptr;
size_t CurrentPosition = 0;
size_t BufferCapacity = 0;
// Ensure there are at least N more positions in the buffer.
void grow(size_t N) {
size_t Need = N + CurrentPosition;
if (Need > BufferCapacity) {
// Reduce the number of reallocations, with a bit of hysteresis. The
// number here is chosen so the first allocation will more-than-likely not
// allocate more than 1K.
Need += 1024 - 32;
BufferCapacity *= 2;
if (BufferCapacity < Need)
BufferCapacity = Need;
Buffer = static_cast<char *>(std::realloc(Buffer, BufferCapacity));
if (Buffer == nullptr)
std::terminate();
}
}
OutputBuffer &writeUnsigned(uint64_t N, bool isNeg = false) {
std::array<char, 21> Temp;
char *TempPtr = Temp.data() + Temp.size();
// Output at least one character.
do {
*--TempPtr = char('0' + N % 10);
N /= 10;
} while (N);
// Add negative sign.
if (isNeg)
*--TempPtr = '-';
return operator+=(
std::string_view(TempPtr, Temp.data() + Temp.size() - TempPtr));
}
public:
OutputBuffer(char *StartBuf, size_t Size)
: Buffer(StartBuf), BufferCapacity(Size) {}
OutputBuffer(char *StartBuf, size_t *SizePtr)
: OutputBuffer(StartBuf, StartBuf ? *SizePtr : 0) {}
OutputBuffer() = default;
// Non-copyable
OutputBuffer(const OutputBuffer &) = delete;
OutputBuffer &operator=(const OutputBuffer &) = delete;
operator std::string_view() const {
return std::string_view(Buffer, CurrentPosition);
}
/// If a ParameterPackExpansion (or similar type) is encountered, the offset
/// into the pack that we're currently printing.
unsigned CurrentPackIndex = std::numeric_limits<unsigned>::max();
unsigned CurrentPackMax = std::numeric_limits<unsigned>::max();
/// When zero, we're printing template args and '>' needs to be parenthesized.
/// Use a counter so we can simply increment inside parentheses.
unsigned GtIsGt = 1;
bool isGtInsideTemplateArgs() const { return GtIsGt == 0; }
void printOpen(char Open = '(') {
GtIsGt++;
*this += Open;
}
void printClose(char Close = ')') {
GtIsGt--;
*this += Close;
}
OutputBuffer &operator+=(std::string_view R) {
if (size_t Size = R.size()) {
grow(Size);
std::memcpy(Buffer + CurrentPosition, &*R.begin(), Size);
CurrentPosition += Size;
}
return *this;
}
OutputBuffer &operator+=(char C) {
grow(1);
Buffer[CurrentPosition++] = C;
return *this;
}
OutputBuffer &prepend(std::string_view R) {
size_t Size = R.size();
grow(Size);
std::memmove(Buffer + Size, Buffer, CurrentPosition);
std::memcpy(Buffer, &*R.begin(), Size);
CurrentPosition += Size;
return *this;
}
OutputBuffer &operator<<(std::string_view R) { return (*this += R); }
OutputBuffer &operator<<(char C) { return (*this += C); }
OutputBuffer &operator<<(long long N) {
return writeUnsigned(static_cast<unsigned long long>(std::abs(N)), N < 0);
}
OutputBuffer &operator<<(unsigned long long N) {
return writeUnsigned(N, false);
}
OutputBuffer &operator<<(long N) {
return this->operator<<(static_cast<long long>(N));
}
OutputBuffer &operator<<(unsigned long N) {
return this->operator<<(static_cast<unsigned long long>(N));
}
OutputBuffer &operator<<(int N) {
return this->operator<<(static_cast<long long>(N));
}
OutputBuffer &operator<<(unsigned int N) {
return this->operator<<(static_cast<unsigned long long>(N));
}
void insert(size_t Pos, const char *S, size_t N) {
assert(Pos <= CurrentPosition);
if (N == 0)
return;
grow(N);
std::memmove(Buffer + Pos + N, Buffer + Pos, CurrentPosition - Pos);
std::memcpy(Buffer + Pos, S, N);
CurrentPosition += N;
}
size_t getCurrentPosition() const { return CurrentPosition; }
void setCurrentPosition(size_t NewPos) { CurrentPosition = NewPos; }
char back() const {
assert(CurrentPosition);
return Buffer[CurrentPosition - 1];
}
bool empty() const { return CurrentPosition == 0; }
char *getBuffer() { return Buffer; }
char *getBufferEnd() { return Buffer + CurrentPosition - 1; }
size_t getBufferCapacity() const { return BufferCapacity; }
};
template <class T> class ScopedOverride {
T &Loc;
T Original;
public:
ScopedOverride(T &Loc_) : ScopedOverride(Loc_, Loc_) {}
ScopedOverride(T &Loc_, T NewVal) : Loc(Loc_), Original(Loc_) {
Loc_ = std::move(NewVal);
}
~ScopedOverride() { Loc = std::move(Original); }
ScopedOverride(const ScopedOverride &) = delete;
ScopedOverride &operator=(const ScopedOverride &) = delete;
};
DEMANGLE_NAMESPACE_END
#endif
|
