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usage: trace2 BUG() invocations 

die() messages are traced in trace2, but BUG() messages are not. Anyone
tracking die() messages would have even more reason to track BUG().
Therefore, write to trace2 when BUG() is invoked.

Signed-off-by: Jonathan Tan <jonathantanmy@google.com>
Helped-by: Jeff King <peff@peff.net>
Signed-off-by: Junio C Hamano <gitster@pobox.com>
This commit is contained in:
Jonathan Tan 2021-02-05 12:09:08 -08:00 committed by Junio C Hamano
parent 773e25afc4
commit 0a9dde4a04
3 changed files with 39 additions and 0 deletions
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9
t/helper/test-trace2.c
View File

@ -198,6 +198,14 @@ static int ut_006data(int argc, const char **argv)
return 0;
}
static int ut_007bug(int argc, const char **argv)
{
/*
* Exercise BUG() to ensure that the message is printed to trace2.
*/
BUG("the bug message");
}
/*
* Usage:
* test-tool trace2 <ut_name_1> <ut_usage_1>
@ -214,6 +222,7 @@ static struct unit_test ut_table[] = {
{ ut_004child, "004child", "[<child_command_line>]" },
{ ut_005exec, "005exec", "<git_command_args>" },
{ ut_006data, "006data", "[<category> <key> <value>]+" },
{ ut_007bug, "007bug", "" },
};
/* clang-format on */

19
t/t0210-trace2-normal.sh
View File

@ -147,6 +147,25 @@ test_expect_success 'normal stream, error event' '
test_cmp expect actual
'
# Verb 007bug
#
# Check that BUG writes to trace2
test_expect_success 'BUG messages are written to trace2' '
test_when_finished "rm trace.normal actual expect" &&
test_must_fail env GIT_TRACE2="$(pwd)/trace.normal" test-tool trace2 007bug &&
perl "$TEST_DIRECTORY/t0210/scrub_normal.perl" <trace.normal >actual &&
cat >expect <<-EOF &&
version $V
start _EXE_ trace2 007bug
cmd_name trace2 (trace2)
error the bug message
exit elapsed:_TIME_ code:99
atexit elapsed:_TIME_ code:99
EOF
test_cmp expect actual
'
sane_unset GIT_TRACE2_BRIEF
# Now test without environment variables and get all Trace2 settings

11
usage.c
View File

@ -266,6 +266,10 @@ int BUG_exit_code;
static NORETURN void BUG_vfl(const char *file, int line, const char *fmt, va_list params)
{
char prefix[256];
va_list params_copy;
static int in_bug;
va_copy(params_copy, params);
/* truncation via snprintf is OK here */
if (file)
@ -274,6 +278,13 @@ static NORETURN void BUG_vfl(const char *file, int line, const char *fmt, va_lis
snprintf(prefix, sizeof(prefix), "BUG: ");
vreportf(prefix, fmt, params);
if (in_bug)
abort();
in_bug = 1;
trace2_cmd_error_va(fmt, params_copy);
if (BUG_exit_code)
exit(BUG_exit_code);
abort();