Merge branch 'dl/cocci-everywhere'
[git/git.git] / trace.c
CommitLineData
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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/>.
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22 */
23
24#include "cache.h"
25#include "quote.h"
26
406102a7 27struct trace_key trace_default_key = { "GIT_TRACE", 0, 0, 0 };
8eeb25c6 28struct trace_key trace_perf_key = TRACE_KEY_INIT(PERFORMANCE);
cb507619 29struct trace_key trace_setup_key = TRACE_KEY_INIT(SETUP);
c81539b5 30
06796607 31/* Get a trace file descriptor from "key" env variable. */
6aa30857 32static int get_trace_fd(struct trace_key *key)
6ce4e61f 33{
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34 const char *trace;
35
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36 /* don't open twice */
37 if (key->initialized)
38 return key->fd;
39
40 trace = getenv(key->key);
6ce4e61f 41
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42 if (!trace || !strcmp(trace, "") ||
43 !strcmp(trace, "0") || !strcasecmp(trace, "false"))
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44 key->fd = 0;
45 else if (!strcmp(trace, "1") || !strcasecmp(trace, "true"))
46 key->fd = STDERR_FILENO;
47 else if (strlen(trace) == 1 && isdigit(*trace))
48 key->fd = atoi(trace);
49 else if (is_absolute_path(trace)) {
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50 int fd = open(trace, O_WRONLY | O_APPEND | O_CREAT, 0666);
51 if (fd == -1) {
6f253057 52 warning("could not open '%s' for tracing: %s",
6ce4e61f 53 trace, strerror(errno));
6f253057 54 trace_disable(key);
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55 } else {
56 key->fd = fd;
57 key->need_close = 1;
6ce4e61f 58 }
6aa30857 59 } else {
b3a1c5da
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60 warning("unknown trace value for '%s': %s\n"
61 " If you want to trace into a file, then please set %s\n"
6f253057 62 " to an absolute pathname (starting with /)",
b3a1c5da 63 key->key, trace, key->key);
6f253057 64 trace_disable(key);
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65 }
66
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67 key->initialized = 1;
68 return key->fd;
69}
6ce4e61f 70
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71void trace_disable(struct trace_key *key)
72{
73 if (key->need_close)
74 close(key->fd);
75 key->fd = 0;
76 key->initialized = 1;
77 key->need_close = 0;
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78}
79
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80static int prepare_trace_line(const char *file, int line,
81 struct trace_key *key, struct strbuf *buf)
c69dfd24 82{
124647c4 83 static struct trace_key trace_bare = TRACE_KEY_INIT(BARE);
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84 struct timeval tv;
85 struct tm tm;
86 time_t secs;
124647c4 87
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88 if (!trace_want(key))
89 return 0;
90
124647c4
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91 /* unit tests may want to disable additional trace output */
92 if (trace_want(&trace_bare))
93 return 1;
94
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95 /* print current timestamp */
96 gettimeofday(&tv, NULL);
97 secs = tv.tv_sec;
98 localtime_r(&secs, &tm);
99 strbuf_addf(buf, "%02d:%02d:%02d.%06ld ", tm.tm_hour, tm.tm_min,
100 tm.tm_sec, (long) tv.tv_usec);
c69dfd24 101
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102#ifdef HAVE_VARIADIC_MACROS
103 /* print file:line */
104 strbuf_addf(buf, "%s:%d ", file, line);
105 /* align trace output (column 40 catches most files names in git) */
106 while (buf->len < 40)
107 strbuf_addch(buf, ' ');
108#endif
109
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110 return 1;
111}
112
c0222e76
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113static void trace_write(struct trace_key *key, const void *buf, unsigned len)
114{
3b0c3ab7 115 if (write_in_full(get_trace_fd(key), buf, len) < 0) {
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116 warning("unable to write trace for %s: %s",
117 key->key, strerror(errno));
46ac74b7 118 trace_disable(key);
3b0c3ab7 119 }
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120}
121
32359838
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122void trace_verbatim(struct trace_key *key, const void *buf, unsigned len)
123{
124 if (!trace_want(key))
125 return;
c0222e76 126 trace_write(key, buf, len);
32359838
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127}
128
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129static void print_trace_line(struct trace_key *key, struct strbuf *buf)
130{
a0d4923d 131 strbuf_complete_line(buf);
c0222e76 132 trace_write(key, buf->buf, buf->len);
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133}
134
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135static void trace_vprintf_fl(const char *file, int line, struct trace_key *key,
136 const char *format, va_list ap)
6ce4e61f 137{
ebeb6090 138 struct strbuf buf = STRBUF_INIT;
6ce4e61f 139
e05bed96 140 if (!prepare_trace_line(file, line, key, &buf))
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141 return;
142
4a3b0b25 143 strbuf_vaddf(&buf, format, ap);
c69dfd24 144 print_trace_line(key, &buf);
33011e76 145 strbuf_release(&buf);
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146}
147
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148static void trace_argv_vprintf_fl(const char *file, int line,
149 const char **argv, const char *format,
150 va_list ap)
06796607 151{
66f66c59 152 struct strbuf buf = STRBUF_INIT;
06796607 153
406102a7 154 if (!prepare_trace_line(file, line, &trace_default_key, &buf))
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155 return;
156
66f66c59 157 strbuf_vaddf(&buf, format, ap);
66f66c59 158
1fbdab21 159 sq_quote_argv_pretty(&buf, argv);
406102a7 160 print_trace_line(&trace_default_key, &buf);
33011e76 161 strbuf_release(&buf);
c6053543
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162}
163
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164void trace_strbuf_fl(const char *file, int line, struct trace_key *key,
165 const struct strbuf *data)
94b3b374 166{
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167 struct strbuf buf = STRBUF_INIT;
168
e05bed96 169 if (!prepare_trace_line(file, line, key, &buf))
94b3b374
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170 return;
171
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172 strbuf_addbuf(&buf, data);
173 print_trace_line(key, &buf);
33011e76 174 strbuf_release(&buf);
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175}
176
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177static uint64_t perf_start_times[10];
178static int perf_indent;
179
180uint64_t trace_performance_enter(void)
181{
182 uint64_t now;
183
184 if (!trace_want(&trace_perf_key))
185 return 0;
186
187 now = getnanotime();
188 perf_start_times[perf_indent] = now;
189 if (perf_indent + 1 < ARRAY_SIZE(perf_start_times))
190 perf_indent++;
191 else
192 BUG("Too deep indentation");
193 return now;
194}
195
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196static void trace_performance_vprintf_fl(const char *file, int line,
197 uint64_t nanos, const char *format,
198 va_list ap)
199{
c46c406a 200 static const char space[] = " ";
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201 struct strbuf buf = STRBUF_INIT;
202
203 if (!prepare_trace_line(file, line, &trace_perf_key, &buf))
204 return;
205
206 strbuf_addf(&buf, "performance: %.9f s", (double) nanos / 1000000000);
207
208 if (format && *format) {
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209 if (perf_indent >= strlen(space))
210 BUG("Too deep indentation");
211
212 strbuf_addf(&buf, ":%.*s ", perf_indent, space);
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213 strbuf_vaddf(&buf, format, ap);
214 }
215
216 print_trace_line(&trace_perf_key, &buf);
33011e76 217 strbuf_release(&buf);
09b2c1c7
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218}
219
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220#ifndef HAVE_VARIADIC_MACROS
221
66f66c59 222void trace_printf(const char *format, ...)
6ce4e61f 223{
19247e55 224 va_list ap;
4a3b0b25 225 va_start(ap, format);
406102a7 226 trace_vprintf_fl(NULL, 0, &trace_default_key, format, ap);
19247e55 227 va_end(ap);
66f66c59 228}
6ce4e61f 229
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230void trace_printf_key(struct trace_key *key, const char *format, ...)
231{
232 va_list ap;
233 va_start(ap, format);
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234 trace_vprintf_fl(NULL, 0, key, format, ap);
235 va_end(ap);
236}
237
238void trace_argv_printf(const char **argv, const char *format, ...)
239{
240 va_list ap;
241 va_start(ap, format);
242 trace_argv_vprintf_fl(NULL, 0, argv, format, ap);
66f66c59 243 va_end(ap);
6ce4e61f 244}
a9ca8a85 245
792a646a 246void trace_strbuf(struct trace_key *key, const struct strbuf *data)
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247{
248 trace_strbuf_fl(NULL, 0, key, data);
249}
250
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251void trace_performance(uint64_t nanos, const char *format, ...)
252{
253 va_list ap;
254 va_start(ap, format);
255 trace_performance_vprintf_fl(NULL, 0, nanos, format, ap);
256 va_end(ap);
257}
258
259void trace_performance_since(uint64_t start, const char *format, ...)
260{
261 va_list ap;
262 va_start(ap, format);
263 trace_performance_vprintf_fl(NULL, 0, getnanotime() - start,
264 format, ap);
265 va_end(ap);
266}
267
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268void trace_performance_leave(const char *format, ...)
269{
270 va_list ap;
271 uint64_t since;
272
273 if (perf_indent)
274 perf_indent--;
275
276 if (!format) /* Allow callers to leave without tracing anything */
277 return;
278
279 since = perf_start_times[perf_indent];
280 va_start(ap, format);
281 trace_performance_vprintf_fl(NULL, 0, getnanotime() - since,
282 format, ap);
283 va_end(ap);
284}
285
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286#else
287
288void trace_printf_key_fl(const char *file, int line, struct trace_key *key,
289 const char *format, ...)
290{
291 va_list ap;
292 va_start(ap, format);
293 trace_vprintf_fl(file, line, key, format, ap);
294 va_end(ap);
295}
296
297void trace_argv_printf_fl(const char *file, int line, const char **argv,
298 const char *format, ...)
299{
300 va_list ap;
301 va_start(ap, format);
302 trace_argv_vprintf_fl(file, line, argv, format, ap);
303 va_end(ap);
304}
305
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306void trace_performance_fl(const char *file, int line, uint64_t nanos,
307 const char *format, ...)
308{
309 va_list ap;
310 va_start(ap, format);
311 trace_performance_vprintf_fl(file, line, nanos, format, ap);
312 va_end(ap);
313}
314
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315void trace_performance_leave_fl(const char *file, int line,
316 uint64_t nanos, const char *format, ...)
317{
318 va_list ap;
319 uint64_t since;
320
321 if (perf_indent)
322 perf_indent--;
323
324 if (!format) /* Allow callers to leave without tracing anything */
325 return;
326
327 since = perf_start_times[perf_indent];
328 va_start(ap, format);
329 trace_performance_vprintf_fl(file, line, nanos - since, format, ap);
330 va_end(ap);
331}
332
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333#endif /* HAVE_VARIADIC_MACROS */
334
335
a9ca8a85
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336static const char *quote_crnl(const char *path)
337{
0bb443fd 338 static struct strbuf new_path = STRBUF_INIT;
a9ca8a85
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339
340 if (!path)
341 return NULL;
342
0bb443fd
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343 strbuf_reset(&new_path);
344
345 while (*path) {
346 switch (*path) {
347 case '\\': strbuf_addstr(&new_path, "\\\\"); break;
348 case '\n': strbuf_addstr(&new_path, "\\n"); break;
349 case '\r': strbuf_addstr(&new_path, "\\r"); break;
a9ca8a85 350 default:
0bb443fd 351 strbuf_addch(&new_path, *path);
a9ca8a85 352 }
0bb443fd 353 path++;
a9ca8a85 354 }
0bb443fd 355 return new_path.buf;
a9ca8a85
NTND
356}
357
358/* FIXME: move prefix to startup_info struct and get rid of this arg */
359void trace_repo_setup(const char *prefix)
360{
e83c267f 361 const char *git_work_tree;
56b9f6e7 362 char *cwd;
a9ca8a85 363
cb507619 364 if (!trace_want(&trace_setup_key))
a9ca8a85
NTND
365 return;
366
56b9f6e7 367 cwd = xgetcwd();
a9ca8a85 368
e83c267f
BC
369 if (!(git_work_tree = get_git_work_tree()))
370 git_work_tree = "(null)";
371
372 if (!prefix)
373 prefix = "(null)";
374
cb507619
NTND
375 trace_printf_key(&trace_setup_key, "setup: git_dir: %s\n", quote_crnl(get_git_dir()));
376 trace_printf_key(&trace_setup_key, "setup: git_common_dir: %s\n", quote_crnl(get_git_common_dir()));
377 trace_printf_key(&trace_setup_key, "setup: worktree: %s\n", quote_crnl(git_work_tree));
378 trace_printf_key(&trace_setup_key, "setup: cwd: %s\n", quote_crnl(cwd));
379 trace_printf_key(&trace_setup_key, "setup: prefix: %s\n", quote_crnl(prefix));
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RS
380
381 free(cwd);
a9ca8a85 382}
39bc5e46 383
6aa30857 384int trace_want(struct trace_key *key)
39bc5e46 385{
6aa30857 386 return !!get_trace_fd(key);
39bc5e46 387}
148d6771 388
a6c3c638 389#if defined(HAVE_CLOCK_GETTIME) && defined(HAVE_CLOCK_MONOTONIC)
148d6771
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390
391static inline uint64_t highres_nanos(void)
392{
393 struct timespec ts;
394 if (clock_gettime(CLOCK_MONOTONIC, &ts))
395 return 0;
396 return (uint64_t) ts.tv_sec * 1000000000 + ts.tv_nsec;
397}
398
399#elif defined (GIT_WINDOWS_NATIVE)
400
401static inline uint64_t highres_nanos(void)
402{
403 static uint64_t high_ns, scaled_low_ns;
404 static int scale;
405 LARGE_INTEGER cnt;
406
407 if (!scale) {
408 if (!QueryPerformanceFrequency(&cnt))
409 return 0;
410
411 /* high_ns = number of ns per cnt.HighPart */
412 high_ns = (1000000000LL << 32) / (uint64_t) cnt.QuadPart;
413
414 /*
415 * Number of ns per cnt.LowPart is 10^9 / frequency (or
416 * high_ns >> 32). For maximum precision, we scale this factor
417 * so that it just fits within 32 bit (i.e. won't overflow if
418 * multiplied with cnt.LowPart).
419 */
420 scaled_low_ns = high_ns;
421 scale = 32;
422 while (scaled_low_ns >= 0x100000000LL) {
423 scaled_low_ns >>= 1;
424 scale--;
425 }
426 }
427
428 /* if QPF worked on initialization, we expect QPC to work as well */
429 QueryPerformanceCounter(&cnt);
430
431 return (high_ns * cnt.HighPart) +
432 ((scaled_low_ns * cnt.LowPart) >> scale);
433}
434
435#else
436# define highres_nanos() 0
437#endif
438
439static inline uint64_t gettimeofday_nanos(void)
440{
441 struct timeval tv;
442 gettimeofday(&tv, NULL);
443 return (uint64_t) tv.tv_sec * 1000000000 + tv.tv_usec * 1000;
444}
445
446/*
447 * Returns nanoseconds since the epoch (01/01/1970), for performance tracing
448 * (i.e. favoring high precision over wall clock time accuracy).
449 */
6433d569 450uint64_t getnanotime(void)
148d6771
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451{
452 static uint64_t offset;
453 if (offset > 1) {
454 /* initialization succeeded, return offset + high res time */
455 return offset + highres_nanos();
456 } else if (offset == 1) {
457 /* initialization failed, fall back to gettimeofday */
458 return gettimeofday_nanos();
459 } else {
460 /* initialize offset if high resolution timer works */
461 uint64_t now = gettimeofday_nanos();
462 uint64_t highres = highres_nanos();
463 if (highres)
464 offset = now - highres;
465 else
466 offset = 1;
467 return now;
468 }
469}
578da039 470
578da039
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471static struct strbuf command_line = STRBUF_INIT;
472
473static void print_command_performance_atexit(void)
474{
c46c406a 475 trace_performance_leave("git command:%s", command_line.buf);
578da039
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476}
477
478void trace_command_performance(const char **argv)
479{
480 if (!trace_want(&trace_perf_key))
481 return;
482
c46c406a 483 if (!command_line.len)
578da039
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484 atexit(print_command_performance_atexit);
485
486 strbuf_reset(&command_line);
1fbdab21 487 sq_quote_argv_pretty(&command_line, argv);
c46c406a 488 trace_performance_enter();
578da039 489}