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authorKarsten Blees <karsten.blees@gmail.com>2014-07-12 02:05:03 +0200
committerJunio C Hamano <gitster@pobox.com>2014-07-13 21:25:20 -0700
commite05bed960d3bf3bcfd0f27ab882df3da93e118ed (patch)
treed9ce58a75230ab10a0e2caff5cb0d7787a3a5f1b /trace.c
parent66f66c596fa2b4e7d4c00575a5731d33ab28d4ed (diff)
downloadgit-e05bed960d3bf3bcfd0f27ab882df3da93e118ed.tar.gz
trace: add 'file:line' to all trace output
This is useful to see where trace output came from. Add 'const char *file, int line' parameters to the printing functions and rename them to *_fl. Add trace_printf* and trace_strbuf macros resolving to the *_fl functions and let the preprocessor fill in __FILE__ and __LINE__. As the trace_printf* functions take a variable number of arguments, this requires variadic macros (i.e. '#define foo(...) foo_impl(__VA_ARGS__)'. Though part of C99, it is unclear whether older compilers support this. Thus keep the old functions and only enable variadic macros for GNUC and MSVC 2005+ (_MSC_VER 1400). This has the nice side effect that the old C-style declarations serve as documentation how the macros are to be used. Print 'file:line ' as prefix to each trace line. Align the remaining trace output at column 40 to accommodate 18 char file names + 4 digit line number (currently there are 30 *.c files of length 18 and just 11 of 19). Trace output from longer source files (e.g. builtin/receive-pack.c) will not be aligned. Signed-off-by: Karsten Blees <blees@dcon.de> Signed-off-by: Junio C Hamano <gitster@pobox.com>
Diffstat (limited to 'trace.c')
-rw-r--r--trace.c72
1 files changed, 60 insertions, 12 deletions
diff --git a/trace.c b/trace.c
index e8ce619696..f013958d0a 100644
--- a/trace.c
+++ b/trace.c
@@ -85,7 +85,8 @@ void trace_disable(struct trace_key *key)
static const char err_msg[] = "Could not trace into fd given by "
"GIT_TRACE environment variable";
-static int prepare_trace_line(struct trace_key *key, struct strbuf *buf)
+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;
@@ -108,6 +109,14 @@ static int prepare_trace_line(struct trace_key *key, struct strbuf *buf)
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;
}
@@ -121,49 +130,52 @@ static void print_trace_line(struct trace_key *key, struct strbuf *buf)
strbuf_release(buf);
}
-static void trace_vprintf(struct trace_key *key, const char *format, va_list ap)
+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(key, &buf))
+ if (!prepare_trace_line(file, line, key, &buf))
return;
strbuf_vaddf(&buf, format, ap);
print_trace_line(key, &buf);
}
-void trace_argv_printf(const char **argv, const char *format, ...)
+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;
- va_list ap;
- if (!prepare_trace_line(NULL, &buf))
+ if (!prepare_trace_line(file, line, NULL, &buf))
return;
- va_start(ap, format);
strbuf_vaddf(&buf, format, ap);
- va_end(ap);
sq_quote_argv(&buf, argv, 0);
print_trace_line(NULL, &buf);
}
-void trace_strbuf(struct trace_key *key, const struct strbuf *data)
+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(key, &buf))
+ if (!prepare_trace_line(file, line, key, &buf))
return;
strbuf_addbuf(&buf, data);
print_trace_line(key, &buf);
}
+#ifndef HAVE_VARIADIC_MACROS
+
void trace_printf(const char *format, ...)
{
va_list ap;
va_start(ap, format);
- trace_vprintf(NULL, format, ap);
+ trace_vprintf_fl(NULL, 0, NULL, format, ap);
va_end(ap);
}
@@ -171,10 +183,46 @@ void trace_printf_key(struct trace_key *key, const char *format, ...)
{
va_list ap;
va_start(ap, format);
- trace_vprintf(key, format, ap);
+ 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(const char *key, const struct strbuf *data)
+{
+ trace_strbuf_fl(NULL, 0, key, data);
+}
+
+#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);
+}
+
+#endif /* HAVE_VARIADIC_MACROS */
+
+
static const char *quote_crnl(const char *path)
{
static char new_path[PATH_MAX];