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
|
//===--- Utility.h ----------------------------------------------*- C++ -*-===//
//
// 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(s).
//
//===----------------------------------------------------------------------===//
#ifndef DEMANGLE_UTILITY_H
#define DEMANGLE_UTILITY_H
#include "StringView.h"
#include <cstdint>
#include <cstdlib>
#include <cstring>
#include <iterator>
#include <limits>
DEMANGLE_NAMESPACE_BEGIN
// Stream that AST nodes write their string representation into after the AST
// has been parsed.
class OutputStream {
char *Buffer;
size_t CurrentPosition;
size_t BufferCapacity;
// Ensure there is at least n more positions in buffer.
void grow(size_t N) {
if (N + CurrentPosition >= BufferCapacity) {
BufferCapacity *= 2;
if (BufferCapacity < N + CurrentPosition)
BufferCapacity = N + CurrentPosition;
Buffer = static_cast<char *>(std::realloc(Buffer, BufferCapacity));
if (Buffer == nullptr)
std::terminate();
}
}
void writeUnsigned(uint64_t N, bool isNeg = false) {
// Handle special case...
if (N == 0) {
*this << '0';
return;
}
char Temp[21];
char *TempPtr = std::end(Temp);
while (N) {
*--TempPtr = '0' + char(N % 10);
N /= 10;
}
// Add negative sign...
if (isNeg)
*--TempPtr = '-';
this->operator<<(StringView(TempPtr, std::end(Temp)));
}
public:
OutputStream(char *StartBuf, size_t Size)
: Buffer(StartBuf), CurrentPosition(0), BufferCapacity(Size) {}
OutputStream() = default;
void reset(char *Buffer_, size_t BufferCapacity_) {
CurrentPosition = 0;
Buffer = Buffer_;
BufferCapacity = BufferCapacity_;
}
/// 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();
OutputStream &operator+=(StringView R) {
size_t Size = R.size();
if (Size == 0)
return *this;
grow(Size);
std::memmove(Buffer + CurrentPosition, R.begin(), Size);
CurrentPosition += Size;
return *this;
}
OutputStream &operator+=(char C) {
grow(1);
Buffer[CurrentPosition++] = C;
return *this;
}
OutputStream &operator<<(StringView R) { return (*this += R); }
OutputStream &operator<<(char C) { return (*this += C); }
OutputStream &operator<<(long long N) {
if (N < 0)
writeUnsigned(static_cast<unsigned long long>(-N), true);
else
writeUnsigned(static_cast<unsigned long long>(N));
return *this;
}
OutputStream &operator<<(unsigned long long N) {
writeUnsigned(N, false);
return *this;
}
OutputStream &operator<<(long N) {
return this->operator<<(static_cast<long long>(N));
}
OutputStream &operator<<(unsigned long N) {
return this->operator<<(static_cast<unsigned long long>(N));
}
OutputStream &operator<<(int N) {
return this->operator<<(static_cast<long long>(N));
}
OutputStream &operator<<(unsigned int N) {
return this->operator<<(static_cast<unsigned long long>(N));
}
size_t getCurrentPosition() const { return CurrentPosition; }
void setCurrentPosition(size_t NewPos) { CurrentPosition = NewPos; }
char back() const {
return CurrentPosition ? Buffer[CurrentPosition - 1] : '\0';
}
bool empty() const { return CurrentPosition == 0; }
char *getBuffer() { return Buffer; }
char *getBufferEnd() { return Buffer + CurrentPosition - 1; }
size_t getBufferCapacity() { return BufferCapacity; }
};
template <class T> class SwapAndRestore {
T &Restore;
T OriginalValue;
bool ShouldRestore = true;
public:
SwapAndRestore(T &Restore_) : SwapAndRestore(Restore_, Restore_) {}
SwapAndRestore(T &Restore_, T NewVal)
: Restore(Restore_), OriginalValue(Restore) {
Restore = std::move(NewVal);
}
~SwapAndRestore() {
if (ShouldRestore)
Restore = std::move(OriginalValue);
}
void shouldRestore(bool ShouldRestore_) { ShouldRestore = ShouldRestore_; }
void restoreNow(bool Force) {
if (!Force && !ShouldRestore)
return;
Restore = std::move(OriginalValue);
ShouldRestore = false;
}
SwapAndRestore(const SwapAndRestore &) = delete;
SwapAndRestore &operator=(const SwapAndRestore &) = delete;
};
inline bool initializeOutputStream(char *Buf, size_t *N, OutputStream &S,
size_t InitSize) {
size_t BufferSize;
if (Buf == nullptr) {
Buf = static_cast<char *>(std::malloc(InitSize));
if (Buf == nullptr)
return false;
BufferSize = InitSize;
} else
BufferSize = *N;
S.reset(Buf, BufferSize);
return true;
}
DEMANGLE_NAMESPACE_END
#endif
|
