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6ce4e61f CC |
1 | /* |
2 | * GIT - The information manager from hell | |
3 | * | |
4 | * Copyright (C) 2000-2002 Michael R. Elkins <me@mutt.org> | |
5 | * Copyright (C) 2002-2004 Oswald Buddenhagen <ossi@users.sf.net> | |
6 | * Copyright (C) 2004 Theodore Y. Ts'o <tytso@mit.edu> | |
7 | * Copyright (C) 2006 Mike McCormack | |
8 | * Copyright (C) 2006 Christian Couder | |
9 | * | |
10 | * This program is free software; you can redistribute it and/or modify | |
11 | * it under the terms of the GNU General Public License as published by | |
12 | * the Free Software Foundation; either version 2 of the License, or | |
13 | * (at your option) any later version. | |
14 | * | |
15 | * This program is distributed in the hope that it will be useful, | |
16 | * but WITHOUT ANY WARRANTY; without even the implied warranty of | |
17 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the | |
18 | * GNU General Public License for more details. | |
19 | * | |
20 | * You should have received a copy of the GNU General Public License | |
48425792 | 21 | * along with this program; if not, see <http://www.gnu.org/licenses/>. |
6ce4e61f CC |
22 | */ |
23 | ||
24 | #include "cache.h" | |
25 | #include "quote.h" | |
26 | ||
406102a7 | 27 | struct trace_key trace_default_key = { "GIT_TRACE", 0, 0, 0 }; |
8eeb25c6 | 28 | struct trace_key trace_perf_key = TRACE_KEY_INIT(PERFORMANCE); |
c81539b5 | 29 | |
06796607 | 30 | /* Get a trace file descriptor from "key" env variable. */ |
6aa30857 | 31 | static int get_trace_fd(struct trace_key *key) |
6ce4e61f | 32 | { |
6aa30857 KB |
33 | const char *trace; |
34 | ||
6aa30857 KB |
35 | /* don't open twice */ |
36 | if (key->initialized) | |
37 | return key->fd; | |
38 | ||
39 | trace = getenv(key->key); | |
6ce4e61f | 40 | |
6844fc80 CC |
41 | if (!trace || !strcmp(trace, "") || |
42 | !strcmp(trace, "0") || !strcasecmp(trace, "false")) | |
6aa30857 KB |
43 | key->fd = 0; |
44 | else if (!strcmp(trace, "1") || !strcasecmp(trace, "true")) | |
45 | key->fd = STDERR_FILENO; | |
46 | else if (strlen(trace) == 1 && isdigit(*trace)) | |
47 | key->fd = atoi(trace); | |
48 | else if (is_absolute_path(trace)) { | |
6ce4e61f CC |
49 | int fd = open(trace, O_WRONLY | O_APPEND | O_CREAT, 0666); |
50 | if (fd == -1) { | |
6f253057 | 51 | warning("could not open '%s' for tracing: %s", |
6ce4e61f | 52 | trace, strerror(errno)); |
6f253057 | 53 | trace_disable(key); |
6aa30857 KB |
54 | } else { |
55 | key->fd = fd; | |
56 | key->need_close = 1; | |
6ce4e61f | 57 | } |
6aa30857 | 58 | } else { |
b3a1c5da JK |
59 | warning("unknown trace value for '%s': %s\n" |
60 | " If you want to trace into a file, then please set %s\n" | |
6f253057 | 61 | " to an absolute pathname (starting with /)", |
b3a1c5da | 62 | key->key, trace, key->key); |
6f253057 | 63 | trace_disable(key); |
6ce4e61f CC |
64 | } |
65 | ||
6aa30857 KB |
66 | key->initialized = 1; |
67 | return key->fd; | |
68 | } | |
6ce4e61f | 69 | |
6aa30857 KB |
70 | void trace_disable(struct trace_key *key) |
71 | { | |
72 | if (key->need_close) | |
73 | close(key->fd); | |
74 | key->fd = 0; | |
75 | key->initialized = 1; | |
76 | key->need_close = 0; | |
6ce4e61f CC |
77 | } |
78 | ||
e05bed96 KB |
79 | static int prepare_trace_line(const char *file, int line, |
80 | struct trace_key *key, struct strbuf *buf) | |
c69dfd24 | 81 | { |
124647c4 | 82 | static struct trace_key trace_bare = TRACE_KEY_INIT(BARE); |
b72be02c KB |
83 | struct timeval tv; |
84 | struct tm tm; | |
85 | time_t secs; | |
124647c4 | 86 | |
c69dfd24 KB |
87 | if (!trace_want(key)) |
88 | return 0; | |
89 | ||
90 | set_try_to_free_routine(NULL); /* is never reset */ | |
91 | ||
124647c4 KB |
92 | /* unit tests may want to disable additional trace output */ |
93 | if (trace_want(&trace_bare)) | |
94 | return 1; | |
95 | ||
b72be02c KB |
96 | /* print current timestamp */ |
97 | gettimeofday(&tv, NULL); | |
98 | secs = tv.tv_sec; | |
99 | localtime_r(&secs, &tm); | |
100 | strbuf_addf(buf, "%02d:%02d:%02d.%06ld ", tm.tm_hour, tm.tm_min, | |
101 | tm.tm_sec, (long) tv.tv_usec); | |
c69dfd24 | 102 | |
e05bed96 KB |
103 | #ifdef HAVE_VARIADIC_MACROS |
104 | /* print file:line */ | |
105 | strbuf_addf(buf, "%s:%d ", file, line); | |
106 | /* align trace output (column 40 catches most files names in git) */ | |
107 | while (buf->len < 40) | |
108 | strbuf_addch(buf, ' '); | |
109 | #endif | |
110 | ||
c69dfd24 KB |
111 | return 1; |
112 | } | |
113 | ||
c0222e76 JK |
114 | static void trace_write(struct trace_key *key, const void *buf, unsigned len) |
115 | { | |
3b0c3ab7 | 116 | if (write_in_full(get_trace_fd(key), buf, len) < 0) { |
3b0c3ab7 JK |
117 | warning("unable to write trace for %s: %s", |
118 | key->key, strerror(errno)); | |
46ac74b7 | 119 | trace_disable(key); |
3b0c3ab7 | 120 | } |
c0222e76 JK |
121 | } |
122 | ||
32359838 JK |
123 | void trace_verbatim(struct trace_key *key, const void *buf, unsigned len) |
124 | { | |
125 | if (!trace_want(key)) | |
126 | return; | |
c0222e76 | 127 | trace_write(key, buf, len); |
32359838 JK |
128 | } |
129 | ||
c69dfd24 KB |
130 | static void print_trace_line(struct trace_key *key, struct strbuf *buf) |
131 | { | |
a0d4923d | 132 | strbuf_complete_line(buf); |
c0222e76 | 133 | trace_write(key, buf->buf, buf->len); |
c69dfd24 KB |
134 | strbuf_release(buf); |
135 | } | |
136 | ||
e05bed96 KB |
137 | static void trace_vprintf_fl(const char *file, int line, struct trace_key *key, |
138 | const char *format, va_list ap) | |
6ce4e61f | 139 | { |
ebeb6090 | 140 | struct strbuf buf = STRBUF_INIT; |
6ce4e61f | 141 | |
e05bed96 | 142 | if (!prepare_trace_line(file, line, key, &buf)) |
6ce4e61f CC |
143 | return; |
144 | ||
4a3b0b25 | 145 | strbuf_vaddf(&buf, format, ap); |
c69dfd24 | 146 | print_trace_line(key, &buf); |
6ce4e61f CC |
147 | } |
148 | ||
e05bed96 KB |
149 | static void trace_argv_vprintf_fl(const char *file, int line, |
150 | const char **argv, const char *format, | |
151 | va_list ap) | |
06796607 | 152 | { |
66f66c59 | 153 | struct strbuf buf = STRBUF_INIT; |
06796607 | 154 | |
406102a7 | 155 | if (!prepare_trace_line(file, line, &trace_default_key, &buf)) |
66f66c59 KB |
156 | return; |
157 | ||
66f66c59 | 158 | strbuf_vaddf(&buf, format, ap); |
66f66c59 KB |
159 | |
160 | sq_quote_argv(&buf, argv, 0); | |
406102a7 | 161 | print_trace_line(&trace_default_key, &buf); |
c6053543 JK |
162 | } |
163 | ||
e05bed96 KB |
164 | void trace_strbuf_fl(const char *file, int line, struct trace_key *key, |
165 | const struct strbuf *data) | |
94b3b374 | 166 | { |
c69dfd24 KB |
167 | struct strbuf buf = STRBUF_INIT; |
168 | ||
e05bed96 | 169 | if (!prepare_trace_line(file, line, key, &buf)) |
94b3b374 JK |
170 | return; |
171 | ||
c69dfd24 KB |
172 | strbuf_addbuf(&buf, data); |
173 | print_trace_line(key, &buf); | |
94b3b374 JK |
174 | } |
175 | ||
09b2c1c7 KB |
176 | static void trace_performance_vprintf_fl(const char *file, int line, |
177 | uint64_t nanos, const char *format, | |
178 | va_list ap) | |
179 | { | |
180 | struct strbuf buf = STRBUF_INIT; | |
181 | ||
182 | if (!prepare_trace_line(file, line, &trace_perf_key, &buf)) | |
183 | return; | |
184 | ||
185 | strbuf_addf(&buf, "performance: %.9f s", (double) nanos / 1000000000); | |
186 | ||
187 | if (format && *format) { | |
188 | strbuf_addstr(&buf, ": "); | |
189 | strbuf_vaddf(&buf, format, ap); | |
190 | } | |
191 | ||
192 | print_trace_line(&trace_perf_key, &buf); | |
193 | } | |
194 | ||
e05bed96 KB |
195 | #ifndef HAVE_VARIADIC_MACROS |
196 | ||
66f66c59 | 197 | void trace_printf(const char *format, ...) |
6ce4e61f | 198 | { |
19247e55 | 199 | va_list ap; |
4a3b0b25 | 200 | va_start(ap, format); |
406102a7 | 201 | trace_vprintf_fl(NULL, 0, &trace_default_key, format, ap); |
19247e55 | 202 | va_end(ap); |
66f66c59 | 203 | } |
6ce4e61f | 204 | |
66f66c59 KB |
205 | void trace_printf_key(struct trace_key *key, const char *format, ...) |
206 | { | |
207 | va_list ap; | |
208 | va_start(ap, format); | |
e05bed96 KB |
209 | trace_vprintf_fl(NULL, 0, key, format, ap); |
210 | va_end(ap); | |
211 | } | |
212 | ||
213 | void trace_argv_printf(const char **argv, const char *format, ...) | |
214 | { | |
215 | va_list ap; | |
216 | va_start(ap, format); | |
217 | trace_argv_vprintf_fl(NULL, 0, argv, format, ap); | |
66f66c59 | 218 | va_end(ap); |
6ce4e61f | 219 | } |
a9ca8a85 | 220 | |
792a646a | 221 | void trace_strbuf(struct trace_key *key, const struct strbuf *data) |
e05bed96 KB |
222 | { |
223 | trace_strbuf_fl(NULL, 0, key, data); | |
224 | } | |
225 | ||
09b2c1c7 KB |
226 | void trace_performance(uint64_t nanos, const char *format, ...) |
227 | { | |
228 | va_list ap; | |
229 | va_start(ap, format); | |
230 | trace_performance_vprintf_fl(NULL, 0, nanos, format, ap); | |
231 | va_end(ap); | |
232 | } | |
233 | ||
234 | void trace_performance_since(uint64_t start, const char *format, ...) | |
235 | { | |
236 | va_list ap; | |
237 | va_start(ap, format); | |
238 | trace_performance_vprintf_fl(NULL, 0, getnanotime() - start, | |
239 | format, ap); | |
240 | va_end(ap); | |
241 | } | |
242 | ||
e05bed96 KB |
243 | #else |
244 | ||
245 | void trace_printf_key_fl(const char *file, int line, struct trace_key *key, | |
246 | const char *format, ...) | |
247 | { | |
248 | va_list ap; | |
249 | va_start(ap, format); | |
250 | trace_vprintf_fl(file, line, key, format, ap); | |
251 | va_end(ap); | |
252 | } | |
253 | ||
254 | void trace_argv_printf_fl(const char *file, int line, const char **argv, | |
255 | const char *format, ...) | |
256 | { | |
257 | va_list ap; | |
258 | va_start(ap, format); | |
259 | trace_argv_vprintf_fl(file, line, argv, format, ap); | |
260 | va_end(ap); | |
261 | } | |
262 | ||
09b2c1c7 KB |
263 | void trace_performance_fl(const char *file, int line, uint64_t nanos, |
264 | const char *format, ...) | |
265 | { | |
266 | va_list ap; | |
267 | va_start(ap, format); | |
268 | trace_performance_vprintf_fl(file, line, nanos, format, ap); | |
269 | va_end(ap); | |
270 | } | |
271 | ||
e05bed96 KB |
272 | #endif /* HAVE_VARIADIC_MACROS */ |
273 | ||
274 | ||
a9ca8a85 NTND |
275 | static const char *quote_crnl(const char *path) |
276 | { | |
0bb443fd | 277 | static struct strbuf new_path = STRBUF_INIT; |
a9ca8a85 NTND |
278 | |
279 | if (!path) | |
280 | return NULL; | |
281 | ||
0bb443fd JK |
282 | strbuf_reset(&new_path); |
283 | ||
284 | while (*path) { | |
285 | switch (*path) { | |
286 | case '\\': strbuf_addstr(&new_path, "\\\\"); break; | |
287 | case '\n': strbuf_addstr(&new_path, "\\n"); break; | |
288 | case '\r': strbuf_addstr(&new_path, "\\r"); break; | |
a9ca8a85 | 289 | default: |
0bb443fd | 290 | strbuf_addch(&new_path, *path); |
a9ca8a85 | 291 | } |
0bb443fd | 292 | path++; |
a9ca8a85 | 293 | } |
0bb443fd | 294 | return new_path.buf; |
a9ca8a85 NTND |
295 | } |
296 | ||
297 | /* FIXME: move prefix to startup_info struct and get rid of this arg */ | |
298 | void trace_repo_setup(const char *prefix) | |
299 | { | |
6aa30857 | 300 | static struct trace_key key = TRACE_KEY_INIT(SETUP); |
e83c267f | 301 | const char *git_work_tree; |
56b9f6e7 | 302 | char *cwd; |
a9ca8a85 | 303 | |
6aa30857 | 304 | if (!trace_want(&key)) |
a9ca8a85 NTND |
305 | return; |
306 | ||
56b9f6e7 | 307 | cwd = xgetcwd(); |
a9ca8a85 | 308 | |
e83c267f BC |
309 | if (!(git_work_tree = get_git_work_tree())) |
310 | git_work_tree = "(null)"; | |
311 | ||
312 | if (!prefix) | |
313 | prefix = "(null)"; | |
314 | ||
6aa30857 | 315 | trace_printf_key(&key, "setup: git_dir: %s\n", quote_crnl(get_git_dir())); |
31e26ebc | 316 | trace_printf_key(&key, "setup: git_common_dir: %s\n", quote_crnl(get_git_common_dir())); |
6aa30857 KB |
317 | trace_printf_key(&key, "setup: worktree: %s\n", quote_crnl(git_work_tree)); |
318 | trace_printf_key(&key, "setup: cwd: %s\n", quote_crnl(cwd)); | |
319 | trace_printf_key(&key, "setup: prefix: %s\n", quote_crnl(prefix)); | |
56b9f6e7 RS |
320 | |
321 | free(cwd); | |
a9ca8a85 | 322 | } |
39bc5e46 | 323 | |
6aa30857 | 324 | int trace_want(struct trace_key *key) |
39bc5e46 | 325 | { |
6aa30857 | 326 | return !!get_trace_fd(key); |
39bc5e46 | 327 | } |
148d6771 | 328 | |
a6c3c638 | 329 | #if defined(HAVE_CLOCK_GETTIME) && defined(HAVE_CLOCK_MONOTONIC) |
148d6771 KB |
330 | |
331 | static inline uint64_t highres_nanos(void) | |
332 | { | |
333 | struct timespec ts; | |
334 | if (clock_gettime(CLOCK_MONOTONIC, &ts)) | |
335 | return 0; | |
336 | return (uint64_t) ts.tv_sec * 1000000000 + ts.tv_nsec; | |
337 | } | |
338 | ||
339 | #elif defined (GIT_WINDOWS_NATIVE) | |
340 | ||
341 | static inline uint64_t highres_nanos(void) | |
342 | { | |
343 | static uint64_t high_ns, scaled_low_ns; | |
344 | static int scale; | |
345 | LARGE_INTEGER cnt; | |
346 | ||
347 | if (!scale) { | |
348 | if (!QueryPerformanceFrequency(&cnt)) | |
349 | return 0; | |
350 | ||
351 | /* high_ns = number of ns per cnt.HighPart */ | |
352 | high_ns = (1000000000LL << 32) / (uint64_t) cnt.QuadPart; | |
353 | ||
354 | /* | |
355 | * Number of ns per cnt.LowPart is 10^9 / frequency (or | |
356 | * high_ns >> 32). For maximum precision, we scale this factor | |
357 | * so that it just fits within 32 bit (i.e. won't overflow if | |
358 | * multiplied with cnt.LowPart). | |
359 | */ | |
360 | scaled_low_ns = high_ns; | |
361 | scale = 32; | |
362 | while (scaled_low_ns >= 0x100000000LL) { | |
363 | scaled_low_ns >>= 1; | |
364 | scale--; | |
365 | } | |
366 | } | |
367 | ||
368 | /* if QPF worked on initialization, we expect QPC to work as well */ | |
369 | QueryPerformanceCounter(&cnt); | |
370 | ||
371 | return (high_ns * cnt.HighPart) + | |
372 | ((scaled_low_ns * cnt.LowPart) >> scale); | |
373 | } | |
374 | ||
375 | #else | |
376 | # define highres_nanos() 0 | |
377 | #endif | |
378 | ||
379 | static inline uint64_t gettimeofday_nanos(void) | |
380 | { | |
381 | struct timeval tv; | |
382 | gettimeofday(&tv, NULL); | |
383 | return (uint64_t) tv.tv_sec * 1000000000 + tv.tv_usec * 1000; | |
384 | } | |
385 | ||
386 | /* | |
387 | * Returns nanoseconds since the epoch (01/01/1970), for performance tracing | |
388 | * (i.e. favoring high precision over wall clock time accuracy). | |
389 | */ | |
6433d569 | 390 | uint64_t getnanotime(void) |
148d6771 KB |
391 | { |
392 | static uint64_t offset; | |
393 | if (offset > 1) { | |
394 | /* initialization succeeded, return offset + high res time */ | |
395 | return offset + highres_nanos(); | |
396 | } else if (offset == 1) { | |
397 | /* initialization failed, fall back to gettimeofday */ | |
398 | return gettimeofday_nanos(); | |
399 | } else { | |
400 | /* initialize offset if high resolution timer works */ | |
401 | uint64_t now = gettimeofday_nanos(); | |
402 | uint64_t highres = highres_nanos(); | |
403 | if (highres) | |
404 | offset = now - highres; | |
405 | else | |
406 | offset = 1; | |
407 | return now; | |
408 | } | |
409 | } | |
578da039 KB |
410 | |
411 | static uint64_t command_start_time; | |
412 | static struct strbuf command_line = STRBUF_INIT; | |
413 | ||
414 | static void print_command_performance_atexit(void) | |
415 | { | |
416 | trace_performance_since(command_start_time, "git command:%s", | |
417 | command_line.buf); | |
418 | } | |
419 | ||
420 | void trace_command_performance(const char **argv) | |
421 | { | |
422 | if (!trace_want(&trace_perf_key)) | |
423 | return; | |
424 | ||
425 | if (!command_start_time) | |
426 | atexit(print_command_performance_atexit); | |
427 | ||
428 | strbuf_reset(&command_line); | |
429 | sq_quote_argv(&command_line, argv, 0); | |
430 | command_start_time = getnanotime(); | |
431 | } |