[PATCH v5 08/11] trace: add 'file:line' to all trace output
- From
Karsten Blees <karsten.blees@gmail.com>
- Date
- Jun 11, 2014, 08:00 UTC
- Message-ID
- <53980CA4.9050101@gmail.com>
- In-Reply-To
- <53980B83.9050409@gmail.com>
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.
Signed-off-by: Karsten Blees <blees@dcon.de> --- git-compat-util.h | 4 ++++ trace.c | 69 +++++++++++++++++++++++++++++++++++++++++++++---------- trace.h | 49 +++++++++++++++++++++++++++++++++++++++ 3 files changed, 110 insertions(+), 12 deletions(-)
diff --git a/git-compat-util.h b/git-compat-util.h index 7849d31..e5a773b 100644 --- a/git-compat-util.h +++ b/git-compat-util.h @@ -700,6 +700,10 @@ void git_qsort(void *base, size_t nmemb, size_t size, #endif #endif +#if defined(__GNUC__) || (_MSC_VER >= 1400) +#define HAVE_VARIADIC_MACROS 1 +#endif + /* * Preserves errno, prints a message, but gives no warning for ENOENT. * Always returns the return value of unlink(2). diff --git a/trace.c b/trace.c index c86d33c..231e24a 100644 --- a/trace.c +++ b/trace.c @@ -77,7 +77,8 @@ static void do_trace_print(const char *key, const struct strbuf *buf) close(fd); } -static int prepare_trace_line(const char *key, struct strbuf *buf) +static int prepare_trace_line(const char *file, int line, const char *key, + struct strbuf *buf) { struct timeval tv; struct tm tm; @@ -95,6 +96,11 @@ static int prepare_trace_line(const char *key, struct strbuf *buf) strbuf_addf(buf, "%02d:%02d:%02d.%06ld ", tm.tm_hour, tm.tm_min, tm.tm_sec, tv.tv_usec); +#ifdef HAVE_VARIADIC_MACROS + /* print file:line */ + strbuf_addf(buf, "%s:%d ", file, line); +#endif + return 1; } @@ -108,49 +114,52 @@ static void print_trace_line(const char *key, struct strbuf *buf) strbuf_release(buf); } -static void trace_vprintf(const char *key, const char *format, va_list ap) +static void trace_vprintf_fl(const char *file, int line, const char *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("GIT_TRACE", &buf)) + if (!prepare_trace_line(file, line, "GIT_TRACE", &buf)) return; - va_start(ap, format); strbuf_vaddf(&buf, format, ap); - va_end(ap); sq_quote_argv(&buf, argv, 0); print_trace_line("GIT_TRACE", &buf); } -void trace_strbuf(const char *key, const struct strbuf *data) +void trace_strbuf_fl(const char *file, int line, const char *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("GIT_TRACE", format, ap); + trace_vprintf_fl(NULL, 0, "GIT_TRACE", format, ap); va_end(ap); } @@ -158,10 +167,46 @@ void trace_printf_key(const char *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, const char *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]; diff --git a/trace.h b/trace.h index 5c7f2dc..916dc2b 100644 --- a/trace.h +++ b/trace.h @@ -7,6 +7,8 @@ extern void trace_repo_setup(const char *prefix); extern int trace_want(const char *key); +#ifndef HAVE_VARIADIC_MACROS + __attribute__((format (printf, 1, 2))) extern void trace_printf(const char *format, ...); @@ -18,4 +20,51 @@ extern void trace_argv_printf(const char **argv, const char *format, ...); extern void trace_strbuf(const char *key, const struct strbuf *data); +#else + +/* + * Macros to add file:line - see above for C-style declarations of how these + * should be used. + */ + +/* + * Note: with C99 variadic macros, __VA_ARGS__ must include the last fixed + * parameter ('format' in this case). Otherwise, a call without variable + * arguments will have a surplus ','. E.g.: + * + * #define foo(format, ...) bar(format, __VA_ARGS__) + * foo("test"); + * + * will expand to + * + * bar("test",); + * + * which is invalid (note the ',)'). With GNUC, '##__VA_ARGS__' drops the + * comma, but this is non-standard. + */ + +#define trace_printf(...) \ + trace_printf_key_fl(__FILE__, __LINE__, "GIT_TRACE", __VA_ARGS__) + +#define trace_printf_key(key, ...) \ + trace_printf_key_fl(__FILE__, __LINE__, key, __VA_ARGS__) + +#define trace_argv_printf(argv, ...) \ + trace_argv_printf_fl(__FILE__, __LINE__, argv, __VA_ARGS__) + +#define trace_strbuf(key, data) \ + trace_strbuf_fl(__FILE__, __LINE__, key, data) + +/* backend functions, use non-*fl macros instead */ +__attribute__((format (printf, 4, 5))) +extern void trace_printf_key_fl(const char *file, int line, const char *key, + const char *format, ...); +__attribute__((format (printf, 4, 5))) +extern void trace_argv_printf_fl(const char *file, int line, const char **argv, + const char *format, ...); +extern void trace_strbuf_fl(const char *file, int line, const char *key, + const struct strbuf *data); + +#endif /* HAVE_VARIADIC_MACROS */ + #endif /* TRACE_H */
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