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
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
260
261
262
263
|
// Copyright 2012 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 "deps_log.h"
#include <assert.h>
#include <stdio.h>
#include <errno.h>
#include <string.h>
#include <unistd.h>
#include "graph.h"
#include "metrics.h"
#include "state.h"
#include "util.h"
// The version is stored as 4 bytes after the signature and also serves as a
// byte order mark. Signature and version combined are 16 bytes long.
const char kFileSignature[] = "# ninjadeps\n";
const int kCurrentVersion = 1;
DepsLog::~DepsLog() {
Close();
}
bool DepsLog::OpenForWrite(const string& path, string* err) {
file_ = fopen(path.c_str(), "ab");
if (!file_) {
*err = strerror(errno);
return false;
}
SetCloseOnExec(fileno(file_));
// Opening a file in append mode doesn't set the file pointer to the file's
// end on Windows. Do that explicitly.
fseek(file_, 0, SEEK_END);
if (ftell(file_) == 0) {
if (fwrite(kFileSignature, sizeof(kFileSignature) - 1, 1, file_) < 1) {
*err = strerror(errno);
return false;
}
if (fwrite(&kCurrentVersion, 4, 1, file_) < 1) {
*err = strerror(errno);
return false;
}
}
return true;
}
bool DepsLog::RecordDeps(Node* node, TimeStamp mtime,
const vector<Node*>& nodes) {
return RecordDeps(node, mtime, nodes.size(),
nodes.empty() ? NULL : (Node**)&nodes.front());
}
bool DepsLog::RecordDeps(Node* node, TimeStamp mtime,
int node_count, Node** nodes) {
// Track whether there's any new data to be recorded.
bool made_change = false;
// Assign ids to all nodes that are missing one.
if (node->id() < 0) {
RecordId(node);
made_change = true;
}
for (int i = 0; i < node_count; ++i) {
if (nodes[i]->id() < 0) {
RecordId(nodes[i]);
made_change = true;
}
}
// See if the new data is different than the existing data, if any.
if (!made_change) {
Deps* deps = GetDeps(node);
if (!deps ||
deps->mtime != mtime ||
deps->node_count != node_count) {
made_change = true;
} else {
for (int i = 0; i < node_count; ++i) {
if (deps->nodes[i] != nodes[i]) {
made_change = true;
break;
}
}
}
}
// Don't write anything if there's no new info.
if (!made_change)
return true;
uint16_t size = 4 * (1 + 1 + (uint16_t)node_count);
size |= 0x8000; // Deps record: set high bit.
fwrite(&size, 2, 1, file_);
int id = node->id();
fwrite(&id, 4, 1, file_);
int timestamp = mtime;
fwrite(×tamp, 4, 1, file_);
for (int i = 0; i < node_count; ++i) {
id = nodes[i]->id();
fwrite(&id, 4, 1, file_);
}
return true;
}
void DepsLog::Close() {
if (file_)
fclose(file_);
file_ = NULL;
}
bool DepsLog::Load(const string& path, State* state, string* err) {
METRIC_RECORD(".ninja_deps load");
char buf[32 << 10];
FILE* f = fopen(path.c_str(), "rb");
if (!f) {
if (errno == ENOENT)
return true;
*err = strerror(errno);
return false;
}
if (!fgets(buf, sizeof(buf), f)) {
*err = strerror(errno);
return false;
}
int version = 0;
if (fread(&version, 4, 1, f) < 1) {
*err = strerror(errno);
return false;
}
if (version != kCurrentVersion) {
*err = "bad deps log signature or version; starting over";
fclose(f);
unlink(path.c_str());
// Don't report this as a failure. An empty deps log will cause
// us to rebuild the outputs anyway.
return true;
}
for (;;) {
uint16_t size;
if (fread(&size, 2, 1, f) < 1)
break;
bool is_deps = (size >> 15) != 0;
size = size & 0x7FFF;
if (fread(buf, size, 1, f) < 1)
break;
if (is_deps) {
assert(size % 4 == 0);
int* deps_data = reinterpret_cast<int*>(buf);
int out_id = deps_data[0];
int mtime = deps_data[1];
deps_data += 2;
int deps_count = (size / 4) - 2;
Deps* deps = new Deps;
deps->mtime = mtime;
deps->node_count = deps_count;
deps->nodes = new Node*[deps_count];
for (int i = 0; i < deps_count; ++i) {
assert(deps_data[i] < (int)nodes_.size());
assert(nodes_[deps_data[i]]);
deps->nodes[i] = nodes_[deps_data[i]];
}
if (out_id >= (int)deps_.size())
deps_.resize(out_id + 1);
if (deps_[out_id]) {
++dead_record_count_;
delete deps_[out_id];
}
deps_[out_id] = deps;
} else {
StringPiece path(buf, size);
Node* node = state->GetNode(path);
assert(node->id() < 0);
node->set_id(nodes_.size());
nodes_.push_back(node);
}
}
if (ferror(f)) {
*err = strerror(ferror(f));
return false;
}
fclose(f);
return true;
}
DepsLog::Deps* DepsLog::GetDeps(Node* node) {
if (node->id() < 0)
return NULL;
return deps_[node->id()];
}
bool DepsLog::Recompact(const string& path, string* err) {
METRIC_RECORD(".ninja_deps recompact");
printf("Recompacting deps...\n");
string temp_path = path + ".recompact";
DepsLog new_log;
if (!new_log.OpenForWrite(temp_path, err))
return false;
// Clear all known ids so that new ones can be reassigned.
for (vector<Node*>::iterator i = nodes_.begin();
i != nodes_.end(); ++i) {
(*i)->set_id(-1);
}
// Write out all deps again.
for (int old_id = 0; old_id < (int)deps_.size(); ++old_id) {
Deps* deps = deps_[old_id];
if (!new_log.RecordDeps(nodes_[old_id], deps->mtime,
deps->node_count, deps->nodes)) {
new_log.Close();
return false;
}
}
new_log.Close();
if (unlink(path.c_str()) < 0) {
*err = strerror(errno);
return false;
}
if (rename(temp_path.c_str(), path.c_str()) < 0) {
*err = strerror(errno);
return false;
}
return true;
}
bool DepsLog::RecordId(Node* node) {
uint16_t size = (uint16_t)node->path().size();
fwrite(&size, 2, 1, file_);
fwrite(node->path().data(), node->path().size(), 1, file_);
node->set_id(nodes_.size());
nodes_.push_back(node);
return true;
}
|