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
229
230
231
232
233
234
|
/* Generated by re2c 0.13.5 */
// Copyright 2011 Google Inc. All Rights Reserved.
//
// Licensed under the Apache License, Version 2.0 (the "License");
// you may not use this file except in compliance with the License.
// You may obtain a copy of the License at
//
// http://www.apache.org/licenses/LICENSE-2.0
//
// Unless required by applicable law or agreed to in writing, software
// distributed under the License is distributed on an "AS IS" BASIS,
// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
// See the License for the specific language governing permissions and
// limitations under the License.
#include "depfile_parser.h"
// A note on backslashes in Makefiles, from reading the docs:
// Backslash-newline is the line continuation character.
// Backslash-# escapes a # (otherwise meaningful as a comment start).
// Backslash-% escapes a % (otherwise meaningful as a special).
// Finally, quoting the GNU manual, "Backslashes that are not in danger
// of quoting ‘%’ characters go unmolested."
// How do you end a line with a backslash? The netbsd Make docs suggest
// reading the result of a shell command echoing a backslash!
//
// Rather than implement all of above, we do a simpler thing here:
// Backslashes escape a set of characters (see "escapes" defined below),
// otherwise they are passed through verbatim.
// If anyone actually has depfiles that rely on the more complicated
// behavior we can adjust this.
bool DepfileParser::Parse(string* content, string* err) {
// in: current parser input point.
// end: end of input.
// parsing_targets: whether we are parsing targets or dependencies.
char* in = &(*content)[0];
char* end = in + content->size();
bool parsing_targets = true;
while (in < end) {
// out: current output point (typically same as in, but can fall behind
// as we de-escape backslashes).
char* out = in;
// filename: start of the current parsed filename.
char* filename = out;
for (;;) {
// start: beginning of the current parsed span.
const char* start = in;
{
char yych;
static const unsigned char yybm[] = {
0, 0, 0, 0, 0, 0, 0, 0,
0, 0, 0, 0, 0, 0, 0, 0,
0, 0, 0, 0, 0, 0, 0, 0,
0, 0, 0, 0, 0, 0, 0, 0,
0, 128, 0, 0, 0, 0, 0, 0,
128, 128, 0, 128, 128, 128, 128, 128,
128, 128, 128, 128, 128, 128, 128, 128,
128, 128, 128, 0, 0, 128, 0, 0,
128, 128, 128, 128, 128, 128, 128, 128,
128, 128, 128, 128, 128, 128, 128, 128,
128, 128, 128, 128, 128, 128, 128, 128,
128, 128, 128, 0, 0, 0, 0, 128,
0, 128, 128, 128, 128, 128, 128, 128,
128, 128, 128, 128, 128, 128, 128, 128,
128, 128, 128, 128, 128, 128, 128, 128,
128, 128, 128, 128, 0, 128, 128, 0,
0, 0, 0, 0, 0, 0, 0, 0,
0, 0, 0, 0, 0, 0, 0, 0,
0, 0, 0, 0, 0, 0, 0, 0,
0, 0, 0, 0, 0, 0, 0, 0,
0, 0, 0, 0, 0, 0, 0, 0,
0, 0, 0, 0, 0, 0, 0, 0,
0, 0, 0, 0, 0, 0, 0, 0,
0, 0, 0, 0, 0, 0, 0, 0,
0, 0, 0, 0, 0, 0, 0, 0,
0, 0, 0, 0, 0, 0, 0, 0,
0, 0, 0, 0, 0, 0, 0, 0,
0, 0, 0, 0, 0, 0, 0, 0,
0, 0, 0, 0, 0, 0, 0, 0,
0, 0, 0, 0, 0, 0, 0, 0,
0, 0, 0, 0, 0, 0, 0, 0,
0, 0, 0, 0, 0, 0, 0, 0,
};
yych = *in;
if (yych <= '=') {
if (yych <= '$') {
if (yych <= ' ') {
if (yych <= 0x00) goto yy7;
goto yy9;
} else {
if (yych <= '!') goto yy5;
if (yych <= '#') goto yy9;
goto yy4;
}
} else {
if (yych <= '*') {
if (yych <= '\'') goto yy9;
if (yych <= ')') goto yy5;
goto yy9;
} else {
if (yych <= ':') goto yy5;
if (yych <= '<') goto yy9;
goto yy5;
}
}
} else {
if (yych <= '^') {
if (yych <= 'Z') {
if (yych <= '?') goto yy9;
goto yy5;
} else {
if (yych != '\\') goto yy9;
}
} else {
if (yych <= '{') {
if (yych == '`') goto yy9;
goto yy5;
} else {
if (yych <= '|') goto yy9;
if (yych <= '~') goto yy5;
goto yy9;
}
}
}
++in;
if ((yych = *in) <= '"') {
if (yych <= '\f') {
if (yych <= 0x00) goto yy3;
if (yych != '\n') goto yy14;
} else {
if (yych <= '\r') goto yy3;
if (yych == ' ') goto yy16;
goto yy14;
}
} else {
if (yych <= 'Z') {
if (yych <= '#') goto yy16;
if (yych == '*') goto yy16;
goto yy14;
} else {
if (yych <= '\\') goto yy16;
if (yych == '|') goto yy16;
goto yy14;
}
}
yy3:
{
// For any other character (e.g. whitespace), swallow it here,
// allowing the outer logic to loop around again.
break;
}
yy4:
yych = *++in;
if (yych == '$') goto yy12;
goto yy3;
yy5:
++in;
yych = *in;
goto yy11;
yy6:
{
// Got a span of plain text.
int len = (int)(in - start);
// Need to shift it over if we're overwriting backslashes.
if (out < start)
memmove(out, start, len);
out += len;
continue;
}
yy7:
++in;
{
break;
}
yy9:
yych = *++in;
goto yy3;
yy10:
++in;
yych = *in;
yy11:
if (yybm[0+yych] & 128) {
goto yy10;
}
goto yy6;
yy12:
++in;
{
// De-escape dollar character.
*out++ = '$';
continue;
}
yy14:
++in;
{
// Let backslash before other characters through verbatim.
*out++ = '\\';
*out++ = yych;
continue;
}
yy16:
++in;
{
// De-escape backslashed character.
*out++ = yych;
continue;
}
}
}
int len = (int)(out - filename);
const bool is_target = parsing_targets;
if (len > 0 && filename[len - 1] == ':') {
len--; // Strip off trailing colon, if any.
parsing_targets = false;
}
if (len == 0)
continue;
if (!is_target) {
ins_.push_back(StringPiece(filename, len));
} else if (!out_.str_) {
out_ = StringPiece(filename, len);
} else if (out_ != StringPiece(filename, len)) {
*err = "depfile has multiple output paths";
return false;
}
}
return true;
}
|
