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
|
//===--- raw_ostream.cpp - Implement the raw_ostream classes --------------===//
//
// The LLVM Compiler Infrastructure
//
// This file is distributed under the University of Illinois Open Source
// License. See LICENSE.TXT for details.
//
//===----------------------------------------------------------------------===//
//
// This implements support for bulk buffered stream output.
//
//===----------------------------------------------------------------------===//
#include "llvm/Support/raw_ostream.h"
#include <ostream>
using namespace llvm;
#include <fcntl.h>
#if defined(_MSC_VER)
#include <io.h>
#ifndef STDIN_FILENO
# define STDIN_FILENO 0
#endif
#ifndef STDOUT_FILENO
# define STDOUT_FILENO 1
#endif
#ifndef STDERR_FILENO
# define STDERR_FILENO 2
#endif
#endif
// An out of line virtual method to provide a home for the class vtable.
void raw_ostream::handle() {}
raw_ostream &raw_ostream::operator<<(unsigned long N) {
// Zero is a special case.
if (N == 0)
return *this << '0';
char NumberBuffer[20];
char *EndPtr = NumberBuffer+sizeof(NumberBuffer);
char *CurPtr = EndPtr;
while (N) {
*--CurPtr = '0' + char(N % 10);
N /= 10;
}
return write(CurPtr, EndPtr-CurPtr);
}
raw_ostream &raw_ostream::operator<<(long N) {
if (N < 0) {
if (OutBufCur >= OutBufEnd)
flush_impl();
*OutBufCur++ = '-';
N = -N;
}
return this->operator<<(static_cast<unsigned long>(N));
}
raw_ostream &raw_ostream::operator<<(unsigned long long N) {
// Zero is a special case.
if (N == 0)
return *this << '0';
char NumberBuffer[20];
char *EndPtr = NumberBuffer+sizeof(NumberBuffer);
char *CurPtr = EndPtr;
while (N) {
*--CurPtr = '0' + char(N % 10);
N /= 10;
}
return write(CurPtr, EndPtr-CurPtr);
}
raw_ostream &raw_ostream::operator<<(long long N) {
if (N < 0) {
if (OutBufCur >= OutBufEnd)
flush_impl();
*OutBufCur++ = '-';
N = -N;
}
return this->operator<<(static_cast<unsigned long long>(N));
}
raw_ostream &raw_ostream::write(const char *Ptr, unsigned Size) {
if (OutBufCur+Size > OutBufEnd)
flush_impl();
// Handle short strings specially, memcpy isn't very good at very short
// strings.
switch (Size) {
case 4: OutBufCur[3] = Ptr[3]; // FALL THROUGH
case 3: OutBufCur[2] = Ptr[2]; // FALL THROUGH
case 2: OutBufCur[1] = Ptr[1]; // FALL THROUGH
case 1: OutBufCur[0] = Ptr[0]; // FALL THROUGH
case 0: break;
default:
// Normally the string to emit is shorter than the buffer.
if (Size <= unsigned(OutBufEnd-OutBufStart)) {
memcpy(OutBufCur, Ptr, Size);
break;
}
// If emitting a string larger than our buffer, emit in chunks. In this
// case we know that we just flushed the buffer.
while (Size) {
unsigned NumToEmit = OutBufEnd-OutBufStart;
if (Size < NumToEmit) NumToEmit = Size;
assert(OutBufCur == OutBufStart);
memcpy(OutBufStart, Ptr, NumToEmit);
Ptr += NumToEmit;
Size -= NumToEmit;
OutBufCur = OutBufStart + NumToEmit;
flush_impl();
}
break;
}
OutBufCur += Size;
return *this;
}
//===----------------------------------------------------------------------===//
// raw_fd_ostream
//===----------------------------------------------------------------------===//
/// raw_fd_ostream - Open the specified file for writing. If an error occurs,
/// information about the error is put into ErrorInfo, and the stream should
/// be immediately destroyed.
raw_fd_ostream::raw_fd_ostream(const char *Filename, std::string &ErrorInfo) {
// Handle "-" as stdout.
if (Filename[0] == '-' && Filename[1] == 0) {
FD = STDOUT_FILENO;
ShouldClose = false;
return;
}
FD = open(Filename, O_WRONLY|O_CREAT|O_TRUNC, 0644);
if (FD < 0) {
ErrorInfo = "Error opening output file '" + std::string(Filename) + "'";
ShouldClose = false;
} else {
ShouldClose = true;
}
}
raw_fd_ostream::~raw_fd_ostream() {
flush();
if (ShouldClose)
close(FD);
}
void raw_fd_ostream::flush_impl() {
if (OutBufCur-OutBufStart)
::write(FD, OutBufStart, OutBufCur-OutBufStart);
HandleFlush();
}
//===----------------------------------------------------------------------===//
// raw_stdout/err_ostream
//===----------------------------------------------------------------------===//
raw_stdout_ostream::raw_stdout_ostream():raw_fd_ostream(STDOUT_FILENO, false) {}
raw_stderr_ostream::raw_stderr_ostream():raw_fd_ostream(STDERR_FILENO, false) {}
// An out of line virtual method to provide a home for the class vtable.
void raw_stdout_ostream::handle() {}
void raw_stderr_ostream::handle() {}
/// outs() - This returns a reference to a raw_ostream for standard output.
/// Use it like: outs() << "foo" << "bar";
raw_ostream &llvm::outs() {
static raw_stdout_ostream S;
return S;
}
/// errs() - This returns a reference to a raw_ostream for standard error.
/// Use it like: errs() << "foo" << "bar";
raw_ostream &llvm::errs() {
static raw_stderr_ostream S;
return S;
}
//===----------------------------------------------------------------------===//
// raw_os_ostream
//===----------------------------------------------------------------------===//
/// flush_impl - The is the piece of the class that is implemented by
/// subclasses. This outputs the currently buffered data and resets the
/// buffer to empty.
void raw_os_ostream::flush_impl() {
if (OutBufCur-OutBufStart)
OS.write(OutBufStart, OutBufCur-OutBufStart);
HandleFlush();
}
|
