2 * GIT - The information manager from hell
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
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.
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.
20 * You should have received a copy of the GNU General Public License
21 * along with this program; if not, see <http://www.gnu.org/licenses/>.
27 struct trace_key trace_default_key = { "GIT_TRACE", 0, 0, 0 };
29 /* Get a trace file descriptor from "key" env variable. */
30 static int get_trace_fd(struct trace_key *key)
34 /* don't open twice */
38 trace = getenv(key->key);
40 if (!trace || !strcmp(trace, "") ||
41 !strcmp(trace, "0") || !strcasecmp(trace, "false"))
43 else if (!strcmp(trace, "1") || !strcasecmp(trace, "true"))
44 key->fd = STDERR_FILENO;
45 else if (strlen(trace) == 1 && isdigit(*trace))
46 key->fd = atoi(trace);
47 else if (is_absolute_path(trace)) {
48 int fd = open(trace, O_WRONLY | O_APPEND | O_CREAT, 0666);
50 warning("could not open '%s' for tracing: %s",
51 trace, strerror(errno));
58 warning("unknown trace value for '%s': %s\n"
59 " If you want to trace into a file, then please set %s\n"
60 " to an absolute pathname (starting with /)",
61 key->key, trace, key->key);
69 void trace_disable(struct trace_key *key)
78 static int prepare_trace_line(const char *file, int line,
79 struct trace_key *key, struct strbuf *buf)
81 static struct trace_key trace_bare = TRACE_KEY_INIT(BARE);
89 set_try_to_free_routine(NULL); /* is never reset */
91 /* unit tests may want to disable additional trace output */
92 if (trace_want(&trace_bare))
95 /* print current timestamp */
96 gettimeofday(&tv, NULL);
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);
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, ' ');
113 static void trace_write(struct trace_key *key, const void *buf, unsigned len)
115 if (write_in_full(get_trace_fd(key), buf, len) < 0) {
116 warning("unable to write trace for %s: %s",
117 key->key, strerror(errno));
122 void trace_verbatim(struct trace_key *key, const void *buf, unsigned len)
124 if (!trace_want(key))
126 trace_write(key, buf, len);
129 static void print_trace_line(struct trace_key *key, struct strbuf *buf)
131 strbuf_complete_line(buf);
132 trace_write(key, buf->buf, buf->len);
136 static void trace_vprintf_fl(const char *file, int line, struct trace_key *key,
137 const char *format, va_list ap)
139 struct strbuf buf = STRBUF_INIT;
141 if (!prepare_trace_line(file, line, key, &buf))
144 strbuf_vaddf(&buf, format, ap);
145 print_trace_line(key, &buf);
148 static void trace_argv_vprintf_fl(const char *file, int line,
149 const char **argv, const char *format,
152 struct strbuf buf = STRBUF_INIT;
154 if (!prepare_trace_line(file, line, &trace_default_key, &buf))
157 strbuf_vaddf(&buf, format, ap);
159 sq_quote_argv(&buf, argv, 0);
160 print_trace_line(&trace_default_key, &buf);
163 void trace_strbuf_fl(const char *file, int line, struct trace_key *key,
164 const struct strbuf *data)
166 struct strbuf buf = STRBUF_INIT;
168 if (!prepare_trace_line(file, line, key, &buf))
171 strbuf_addbuf(&buf, data);
172 print_trace_line(key, &buf);
175 static struct trace_key trace_perf_key = TRACE_KEY_INIT(PERFORMANCE);
177 static void trace_performance_vprintf_fl(const char *file, int line,
178 uint64_t nanos, const char *format,
181 struct strbuf buf = STRBUF_INIT;
183 if (!prepare_trace_line(file, line, &trace_perf_key, &buf))
186 strbuf_addf(&buf, "performance: %.9f s", (double) nanos / 1000000000);
188 if (format && *format) {
189 strbuf_addstr(&buf, ": ");
190 strbuf_vaddf(&buf, format, ap);
193 print_trace_line(&trace_perf_key, &buf);
196 #ifndef HAVE_VARIADIC_MACROS
198 void trace_printf(const char *format, ...)
201 va_start(ap, format);
202 trace_vprintf_fl(NULL, 0, &trace_default_key, format, ap);
206 void trace_printf_key(struct trace_key *key, const char *format, ...)
209 va_start(ap, format);
210 trace_vprintf_fl(NULL, 0, key, format, ap);
214 void trace_argv_printf(const char **argv, const char *format, ...)
217 va_start(ap, format);
218 trace_argv_vprintf_fl(NULL, 0, argv, format, ap);
222 void trace_strbuf(struct trace_key *key, const struct strbuf *data)
224 trace_strbuf_fl(NULL, 0, key, data);
227 void trace_performance(uint64_t nanos, const char *format, ...)
230 va_start(ap, format);
231 trace_performance_vprintf_fl(NULL, 0, nanos, format, ap);
235 void trace_performance_since(uint64_t start, const char *format, ...)
238 va_start(ap, format);
239 trace_performance_vprintf_fl(NULL, 0, getnanotime() - start,
246 void trace_printf_key_fl(const char *file, int line, struct trace_key *key,
247 const char *format, ...)
250 va_start(ap, format);
251 trace_vprintf_fl(file, line, key, format, ap);
255 void trace_argv_printf_fl(const char *file, int line, const char **argv,
256 const char *format, ...)
259 va_start(ap, format);
260 trace_argv_vprintf_fl(file, line, argv, format, ap);
264 void trace_performance_fl(const char *file, int line, uint64_t nanos,
265 const char *format, ...)
268 va_start(ap, format);
269 trace_performance_vprintf_fl(file, line, nanos, format, ap);
273 #endif /* HAVE_VARIADIC_MACROS */
276 static const char *quote_crnl(const char *path)
278 static struct strbuf new_path = STRBUF_INIT;
283 strbuf_reset(&new_path);
287 case '\\': strbuf_addstr(&new_path, "\\\\"); break;
288 case '\n': strbuf_addstr(&new_path, "\\n"); break;
289 case '\r': strbuf_addstr(&new_path, "\\r"); break;
291 strbuf_addch(&new_path, *path);
298 /* FIXME: move prefix to startup_info struct and get rid of this arg */
299 void trace_repo_setup(const char *prefix)
301 static struct trace_key key = TRACE_KEY_INIT(SETUP);
302 const char *git_work_tree;
305 if (!trace_want(&key))
310 if (!(git_work_tree = get_git_work_tree()))
311 git_work_tree = "(null)";
316 trace_printf_key(&key, "setup: git_dir: %s\n", quote_crnl(get_git_dir()));
317 trace_printf_key(&key, "setup: git_common_dir: %s\n", quote_crnl(get_git_common_dir()));
318 trace_printf_key(&key, "setup: worktree: %s\n", quote_crnl(git_work_tree));
319 trace_printf_key(&key, "setup: cwd: %s\n", quote_crnl(cwd));
320 trace_printf_key(&key, "setup: prefix: %s\n", quote_crnl(prefix));
325 int trace_want(struct trace_key *key)
327 return !!get_trace_fd(key);
330 #if defined(HAVE_CLOCK_GETTIME) && defined(HAVE_CLOCK_MONOTONIC)
332 static inline uint64_t highres_nanos(void)
335 if (clock_gettime(CLOCK_MONOTONIC, &ts))
337 return (uint64_t) ts.tv_sec * 1000000000 + ts.tv_nsec;
340 #elif defined (GIT_WINDOWS_NATIVE)
342 static inline uint64_t highres_nanos(void)
344 static uint64_t high_ns, scaled_low_ns;
349 if (!QueryPerformanceFrequency(&cnt))
352 /* high_ns = number of ns per cnt.HighPart */
353 high_ns = (1000000000LL << 32) / (uint64_t) cnt.QuadPart;
356 * Number of ns per cnt.LowPart is 10^9 / frequency (or
357 * high_ns >> 32). For maximum precision, we scale this factor
358 * so that it just fits within 32 bit (i.e. won't overflow if
359 * multiplied with cnt.LowPart).
361 scaled_low_ns = high_ns;
363 while (scaled_low_ns >= 0x100000000LL) {
369 /* if QPF worked on initialization, we expect QPC to work as well */
370 QueryPerformanceCounter(&cnt);
372 return (high_ns * cnt.HighPart) +
373 ((scaled_low_ns * cnt.LowPart) >> scale);
377 # define highres_nanos() 0
380 static inline uint64_t gettimeofday_nanos(void)
383 gettimeofday(&tv, NULL);
384 return (uint64_t) tv.tv_sec * 1000000000 + tv.tv_usec * 1000;
388 * Returns nanoseconds since the epoch (01/01/1970), for performance tracing
389 * (i.e. favoring high precision over wall clock time accuracy).
391 uint64_t getnanotime(void)
393 static uint64_t offset;
395 /* initialization succeeded, return offset + high res time */
396 return offset + highres_nanos();
397 } else if (offset == 1) {
398 /* initialization failed, fall back to gettimeofday */
399 return gettimeofday_nanos();
401 /* initialize offset if high resolution timer works */
402 uint64_t now = gettimeofday_nanos();
403 uint64_t highres = highres_nanos();
405 offset = now - highres;
412 static uint64_t command_start_time;
413 static struct strbuf command_line = STRBUF_INIT;
415 static void print_command_performance_atexit(void)
417 trace_performance_since(command_start_time, "git command:%s",
421 void trace_command_performance(const char **argv)
423 if (!trace_want(&trace_perf_key))
426 if (!command_start_time)
427 atexit(print_command_performance_atexit);
429 strbuf_reset(&command_line);
430 sq_quote_argv(&command_line, argv, 0);
431 command_start_time = getnanotime();