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/*
* GIT - The information manager from hell
*
* Copyright (C) 2000-2002 Michael R. Elkins <me@mutt.org>
* Copyright (C) 2002-2004 Oswald Buddenhagen <ossi@users.sf.net>
* Copyright (C) 2004 Theodore Y. Ts'o <tytso@mit.edu>
* Copyright (C) 2006 Mike McCormack
* Copyright (C) 2006 Christian Couder
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation; either version 2 of the License, or
* (at your option) any later version.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this program; if not, write to the Free Software
* Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
*/
#include "cache.h"
#include "quote.h"
/* Get a trace file descriptor from "key" env variable. */
static int get_trace_fd(struct trace_key *key)
{
static struct trace_key trace_default = { "GIT_TRACE" };
const char *trace;
/* use default "GIT_TRACE" if NULL */
if (!key)
key = &trace_default;
/* don't open twice */
if (key->initialized)
return key->fd;
trace = getenv(key->key);
if (!trace || !strcmp(trace, "") ||
!strcmp(trace, "0") || !strcasecmp(trace, "false"))
key->fd = 0;
else if (!strcmp(trace, "1") || !strcasecmp(trace, "true"))
key->fd = STDERR_FILENO;
else if (strlen(trace) == 1 && isdigit(*trace))
key->fd = atoi(trace);
else if (is_absolute_path(trace)) {
int fd = open(trace, O_WRONLY | O_APPEND | O_CREAT, 0666);
if (fd == -1) {
fprintf(stderr,
"Could not open '%s' for tracing: %s\n"
"Defaulting to tracing on stderr...\n",
trace, strerror(errno));
key->fd = STDERR_FILENO;
} else {
key->fd = fd;
key->need_close = 1;
}
} else {
fprintf(stderr, "What does '%s' for %s mean?\n"
"If you want to trace into a file, then please set "
"%s to an absolute pathname (starting with /).\n"
"Defaulting to tracing on stderr...\n",
trace, key->key, key->key);
key->fd = STDERR_FILENO;
}
key->initialized = 1;
return key->fd;
}
void trace_disable(struct trace_key *key)
{
if (key->need_close)
close(key->fd);
key->fd = 0;
key->initialized = 1;
key->need_close = 0;
}
static const char err_msg[] = "Could not trace into fd given by "
"GIT_TRACE environment variable";
static int prepare_trace_line(const char *file, int line,
struct trace_key *key, struct strbuf *buf)
{
static struct trace_key trace_bare = TRACE_KEY_INIT(BARE);
struct timeval tv;
struct tm tm;
time_t secs;
if (!trace_want(key))
return 0;
set_try_to_free_routine(NULL); /* is never reset */
/* unit tests may want to disable additional trace output */
if (trace_want(&trace_bare))
return 1;
/* print current timestamp */
gettimeofday(&tv, NULL);
secs = tv.tv_sec;
localtime_r(&secs, &tm);
strbuf_addf(buf, "%02d:%02d:%02d.%06ld ", tm.tm_hour, tm.tm_min,
tm.tm_sec, (long) tv.tv_usec);
#ifdef HAVE_VARIADIC_MACROS
/* print file:line */
strbuf_addf(buf, "%s:%d ", file, line);
/* align trace output (column 40 catches most files names in git) */
while (buf->len < 40)
strbuf_addch(buf, ' ');
#endif
return 1;
}
void trace_verbatim(struct trace_key *key, const void *buf, unsigned len)
{
if (!trace_want(key))
return;
write_or_whine_pipe(get_trace_fd(key), buf, len, err_msg);
}
static void print_trace_line(struct trace_key *key, struct strbuf *buf)
{
strbuf_complete_line(buf);
write_or_whine_pipe(get_trace_fd(key), buf->buf, buf->len, err_msg);
strbuf_release(buf);
}
static void trace_vprintf_fl(const char *file, int line, struct trace_key *key,
const char *format, va_list ap)
{
struct strbuf buf = STRBUF_INIT;
if (!prepare_trace_line(file, line, key, &buf))
return;
strbuf_vaddf(&buf, format, ap);
print_trace_line(key, &buf);
}
static void trace_argv_vprintf_fl(const char *file, int line,
const char **argv, const char *format,
va_list ap)
{
struct strbuf buf = STRBUF_INIT;
if (!prepare_trace_line(file, line, NULL, &buf))
return;
strbuf_vaddf(&buf, format, ap);
sq_quote_argv(&buf, argv, 0);
print_trace_line(NULL, &buf);
}
void trace_strbuf_fl(const char *file, int line, struct trace_key *key,
const struct strbuf *data)
{
struct strbuf buf = STRBUF_INIT;
if (!prepare_trace_line(file, line, key, &buf))
return;
strbuf_addbuf(&buf, data);
print_trace_line(key, &buf);
}
static struct trace_key trace_perf_key = TRACE_KEY_INIT(PERFORMANCE);
static void trace_performance_vprintf_fl(const char *file, int line,
uint64_t nanos, const char *format,
va_list ap)
{
struct strbuf buf = STRBUF_INIT;
if (!prepare_trace_line(file, line, &trace_perf_key, &buf))
return;
strbuf_addf(&buf, "performance: %.9f s", (double) nanos / 1000000000);
if (format && *format) {
strbuf_addstr(&buf, ": ");
strbuf_vaddf(&buf, format, ap);
}
print_trace_line(&trace_perf_key, &buf);
}
#ifndef HAVE_VARIADIC_MACROS
void trace_printf(const char *format, ...)
{
va_list ap;
va_start(ap, format);
trace_vprintf_fl(NULL, 0, NULL, format, ap);
va_end(ap);
}
void trace_printf_key(struct trace_key *key, const char *format, ...)
{
va_list ap;
va_start(ap, format);
trace_vprintf_fl(NULL, 0, key, format, ap);
va_end(ap);
}
void trace_argv_printf(const char **argv, const char *format, ...)
{
va_list ap;
va_start(ap, format);
trace_argv_vprintf_fl(NULL, 0, argv, format, ap);
va_end(ap);
}
void trace_strbuf(struct trace_key *key, const struct strbuf *data)
{
trace_strbuf_fl(NULL, 0, key, data);
}
void trace_performance(uint64_t nanos, const char *format, ...)
{
va_list ap;
va_start(ap, format);
trace_performance_vprintf_fl(NULL, 0, nanos, format, ap);
va_end(ap);
}
void trace_performance_since(uint64_t start, const char *format, ...)
{
va_list ap;
va_start(ap, format);
trace_performance_vprintf_fl(NULL, 0, getnanotime() - start,
format, ap);
va_end(ap);
}
#else
void trace_printf_key_fl(const char *file, int line, struct trace_key *key,
const char *format, ...)
{
va_list ap;
va_start(ap, format);
trace_vprintf_fl(file, line, key, format, ap);
va_end(ap);
}
void trace_argv_printf_fl(const char *file, int line, const char **argv,
const char *format, ...)
{
va_list ap;
va_start(ap, format);
trace_argv_vprintf_fl(file, line, argv, format, ap);
va_end(ap);
}
void trace_performance_fl(const char *file, int line, uint64_t nanos,
const char *format, ...)
{
va_list ap;
va_start(ap, format);
trace_performance_vprintf_fl(file, line, nanos, format, ap);
va_end(ap);
}
#endif /* HAVE_VARIADIC_MACROS */
static const char *quote_crnl(const char *path)
{
static char new_path[PATH_MAX];
const char *p2 = path;
char *p1 = new_path;
if (!path)
return NULL;
while (*p2) {
switch (*p2) {
case '\\': *p1++ = '\\'; *p1++ = '\\'; break;
case '\n': *p1++ = '\\'; *p1++ = 'n'; break;
case '\r': *p1++ = '\\'; *p1++ = 'r'; break;
default:
*p1++ = *p2;
}
p2++;
}
*p1 = '\0';
return new_path;
}
/* FIXME: move prefix to startup_info struct and get rid of this arg */
void trace_repo_setup(const char *prefix)
{
static struct trace_key key = TRACE_KEY_INIT(SETUP);
const char *git_work_tree;
char *cwd;
if (!trace_want(&key))
return;
cwd = xgetcwd();
if (!(git_work_tree = get_git_work_tree()))
git_work_tree = "(null)";
if (!prefix)
prefix = "(null)";
trace_printf_key(&key, "setup: git_dir: %s\n", quote_crnl(get_git_dir()));
trace_printf_key(&key, "setup: git_common_dir: %s\n", quote_crnl(get_git_common_dir()));
trace_printf_key(&key, "setup: worktree: %s\n", quote_crnl(git_work_tree));
trace_printf_key(&key, "setup: cwd: %s\n", quote_crnl(cwd));
trace_printf_key(&key, "setup: prefix: %s\n", quote_crnl(prefix));
free(cwd);
}
int trace_want(struct trace_key *key)
{
return !!get_trace_fd(key);
}
#if defined(HAVE_CLOCK_GETTIME) && defined(HAVE_CLOCK_MONOTONIC)
static inline uint64_t highres_nanos(void)
{
struct timespec ts;
if (clock_gettime(CLOCK_MONOTONIC, &ts))
return 0;
return (uint64_t) ts.tv_sec * 1000000000 + ts.tv_nsec;
}
#elif defined (GIT_WINDOWS_NATIVE)
static inline uint64_t highres_nanos(void)
{
static uint64_t high_ns, scaled_low_ns;
static int scale;
LARGE_INTEGER cnt;
if (!scale) {
if (!QueryPerformanceFrequency(&cnt))
return 0;
/* high_ns = number of ns per cnt.HighPart */
high_ns = (1000000000LL << 32) / (uint64_t) cnt.QuadPart;
/*
* Number of ns per cnt.LowPart is 10^9 / frequency (or
* high_ns >> 32). For maximum precision, we scale this factor
* so that it just fits within 32 bit (i.e. won't overflow if
* multiplied with cnt.LowPart).
*/
scaled_low_ns = high_ns;
scale = 32;
while (scaled_low_ns >= 0x100000000LL) {
scaled_low_ns >>= 1;
scale--;
}
}
/* if QPF worked on initialization, we expect QPC to work as well */
QueryPerformanceCounter(&cnt);
return (high_ns * cnt.HighPart) +
((scaled_low_ns * cnt.LowPart) >> scale);
}
#else
# define highres_nanos() 0
#endif
static inline uint64_t gettimeofday_nanos(void)
{
struct timeval tv;
gettimeofday(&tv, NULL);
return (uint64_t) tv.tv_sec * 1000000000 + tv.tv_usec * 1000;
}
/*
* Returns nanoseconds since the epoch (01/01/1970), for performance tracing
* (i.e. favoring high precision over wall clock time accuracy).
*/
uint64_t getnanotime(void)
{
static uint64_t offset;
if (offset > 1) {
/* initialization succeeded, return offset + high res time */
return offset + highres_nanos();
} else if (offset == 1) {
/* initialization failed, fall back to gettimeofday */
return gettimeofday_nanos();
} else {
/* initialize offset if high resolution timer works */
uint64_t now = gettimeofday_nanos();
uint64_t highres = highres_nanos();
if (highres)
offset = now - highres;
else
offset = 1;
return now;
}
}
static uint64_t command_start_time;
static struct strbuf command_line = STRBUF_INIT;
static void print_command_performance_atexit(void)
{
trace_performance_since(command_start_time, "git command:%s",
command_line.buf);
}
void trace_command_performance(const char **argv)
{
if (!trace_want(&trace_perf_key))
return;
if (!command_start_time)
atexit(print_command_performance_atexit);
strbuf_reset(&command_line);
sq_quote_argv(&command_line, argv, 0);
command_start_time = getnanotime();
}
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