* [PATCH v2 1/1] trace2: NULL is not allowed for va_list
[not found] <20190316104616.27085-1-tboegi@web.de>
@ 2019-03-19 17:13 ` tboegi
2019-03-19 18:03 ` Jeff Hostetler
0 siblings, 1 reply; 2+ messages in thread
From: tboegi @ 2019-03-19 17:13 UTC (permalink / raw)
To: git, jeffhost, mwelinder; +Cc: Torsten Bögershausen
From: Torsten Bögershausen <tboegi@web.de>
Some compilers don't allow NULL to be passed for a va_list,
and e.g. "gcc (Raspbian 6.3.0-18+rpi1+deb9u1) 6.3.0 20170516"
errors out like this:
trace2/tr2_tgt_event.c:193:18:
error: invalid operands to binary &&
(have ‘int’ and ‘va_list {aka __va_list}’)
if (fmt && *fmt && ap) {
^^
I couldn't find any hints that va_list and pointers can be mixed,
and no hints that they can't either. Morten Welinder comments:
"C99, Section 7.15, simply says that va_list "is an object type suitable for
holding information needed by the macros va_start, va_end, and
va_copy". So clearly not guaranteed to be mixable with pointers...
The portable solution is to use "va_list" everywhere in the callchain.
As a consequence, both trace2_region_enter_fl() and trace2_region_leave_fl()
now take a variable argument list.
Signed-off-by: Torsten Bögershausen <tboegi@web.de>
---
trace2.c | 15 +++++++++++----
trace2.h | 4 ++--
trace2/tr2_tgt_event.c | 2 +-
trace2/tr2_tgt_normal.c | 2 +-
trace2/tr2_tgt_perf.c | 2 +-
5 files changed, 16 insertions(+), 9 deletions(-)
diff --git a/trace2.c b/trace2.c
index ccccd4ef09..8bbad56887 100644
--- a/trace2.c
+++ b/trace2.c
@@ -548,10 +548,14 @@ void trace2_region_enter_printf_va_fl(const char *file, int line,
}
void trace2_region_enter_fl(const char *file, int line, const char *category,
- const char *label, const struct repository *repo)
+ const char *label, const struct repository *repo, ...)
{
+ va_list ap;
+ va_start(ap, repo);
trace2_region_enter_printf_va_fl(file, line, category, label, repo,
- NULL, NULL);
+ NULL, ap);
+ va_end(ap);
+
}
void trace2_region_enter_printf_fl(const char *file, int line,
@@ -621,10 +625,13 @@ void trace2_region_leave_printf_va_fl(const char *file, int line,
}
void trace2_region_leave_fl(const char *file, int line, const char *category,
- const char *label, const struct repository *repo)
+ const char *label, const struct repository *repo, ...)
{
+ va_list ap;
+ va_start(ap, repo);
trace2_region_leave_printf_va_fl(file, line, category, label, repo,
- NULL, NULL);
+ NULL, ap);
+ va_end(ap);
}
void trace2_region_leave_printf_fl(const char *file, int line,
diff --git a/trace2.h b/trace2.h
index ae5020d0e6..b330a54a89 100644
--- a/trace2.h
+++ b/trace2.h
@@ -238,7 +238,7 @@ void trace2_def_repo_fl(const char *file, int line, struct repository *repo);
* on this thread.
*/
void trace2_region_enter_fl(const char *file, int line, const char *category,
- const char *label, const struct repository *repo);
+ const char *label, const struct repository *repo, ...);
#define trace2_region_enter(category, label, repo) \
trace2_region_enter_fl(__FILE__, __LINE__, (category), (label), (repo))
@@ -278,7 +278,7 @@ void trace2_region_enter_printf(const char *category, const char *label,
* in this nesting level.
*/
void trace2_region_leave_fl(const char *file, int line, const char *category,
- const char *label, const struct repository *repo);
+ const char *label, const struct repository *repo, ...);
#define trace2_region_leave(category, label, repo) \
trace2_region_leave_fl(__FILE__, __LINE__, (category), (label), (repo))
diff --git a/trace2/tr2_tgt_event.c b/trace2/tr2_tgt_event.c
index 107cb5317d..1cf4f62441 100644
--- a/trace2/tr2_tgt_event.c
+++ b/trace2/tr2_tgt_event.c
@@ -190,7 +190,7 @@ static void fn_atexit(uint64_t us_elapsed_absolute, int code)
static void maybe_add_string_va(struct json_writer *jw, const char *field_name,
const char *fmt, va_list ap)
{
- if (fmt && *fmt && ap) {
+ if (fmt && *fmt) {
va_list copy_ap;
struct strbuf buf = STRBUF_INIT;
diff --git a/trace2/tr2_tgt_normal.c b/trace2/tr2_tgt_normal.c
index 547183d5b6..1a07d70abd 100644
--- a/trace2/tr2_tgt_normal.c
+++ b/trace2/tr2_tgt_normal.c
@@ -126,7 +126,7 @@ static void fn_atexit(uint64_t us_elapsed_absolute, int code)
static void maybe_append_string_va(struct strbuf *buf, const char *fmt,
va_list ap)
{
- if (fmt && *fmt && ap) {
+ if (fmt && *fmt) {
va_list copy_ap;
va_copy(copy_ap, ap);
diff --git a/trace2/tr2_tgt_perf.c b/trace2/tr2_tgt_perf.c
index f0746fcf86..2a866d701b 100644
--- a/trace2/tr2_tgt_perf.c
+++ b/trace2/tr2_tgt_perf.c
@@ -211,7 +211,7 @@ static void fn_atexit(uint64_t us_elapsed_absolute, int code)
static void maybe_append_string_va(struct strbuf *buf, const char *fmt,
va_list ap)
{
- if (fmt && *fmt && ap) {
+ if (fmt && *fmt) {
va_list copy_ap;
va_copy(copy_ap, ap);
--
2.21.0.135.g6e0cc67761
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