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log: Add log_callstack_to_file()

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This makes it trivial to log the callstack to, e.g., stderr, which can
simplify debug cycles.
This commit is contained in:
James McCoy 2017-08-09 13:30:34 -04:00
parent e13b4a21ca
commit 17eb20b22e
3 changed files with 20 additions and 11 deletions
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5
src/nvim/README.md
View File

@ -11,8 +11,9 @@ Logs
Low-level log messages sink to `$NVIM_LOG_FILE`.
You can use `LOG_CALLSTACK()` anywhere in the source to log the current
stacktrace. (Currently Linux-only.)
You can use `LOG_CALLSTACK();` anywhere in the source to log the current
stacktrace. To log in an alternate file, e.g. stderr, use
`LOG_CALLSTACK_TO_FILE(FILE*)`. (Currently Linux-only.)
UI events are logged at level 0 (`DEBUG_LOG_LEVEL`).

25
src/nvim/log.c
View File

@ -178,7 +178,8 @@ FILE *open_log_file(void)
}
#ifdef HAVE_EXECINFO_BACKTRACE
void log_callstack(const char *const func_name, const int line_num)
void log_callstack_to_file(FILE *log_file, const char *const func_name,
const int line_num)
{
void *trace[100];
int trace_size = backtrace(trace, ARRAY_SIZE(trace));
@ -190,8 +191,6 @@ void log_callstack(const char *const func_name, const int line_num)
}
assert(24 + exepathlen < IOSIZE); // Must fit in `cmdbuf` below.
do_log(DEBUG_LOG_LEVEL, func_name, line_num, true, "trace:");
char cmdbuf[IOSIZE + (20 * ARRAY_SIZE(trace))];
snprintf(cmdbuf, sizeof(cmdbuf), "addr2line -e %s -f -p", exepath);
for (int i = 1; i < trace_size; i++) {
@ -202,12 +201,8 @@ void log_callstack(const char *const func_name, const int line_num)
// Now we have a command string like:
// addr2line -e /path/to/exe -f -p 0x123 0x456 ...
log_lock();
FILE *log_file = open_log_file();
if (log_file == NULL) {
goto end;
}
do_log_to_file(log_file, DEBUG_LOG_LEVEL, func_name, line_num, true,
"trace:");
FILE *fp = popen(cmdbuf, "r");
char linebuf[IOSIZE];
while (fgets(linebuf, sizeof(linebuf) - 1, fp) != NULL) {
@ -218,6 +213,18 @@ void log_callstack(const char *const func_name, const int line_num)
if (log_file != stderr && log_file != stdout) {
fclose(log_file);
}
}
void log_callstack(const char *const func_name, const int line_num)
{
log_lock();
FILE *log_file = open_log_file();
if (log_file == NULL) {
goto end;
}
log_callstack_to_file(log_file, func_name, line_num);
end:
log_unlock();
}

1
src/nvim/log.h
View File

@ -63,6 +63,7 @@
#ifdef HAVE_EXECINFO_BACKTRACE
# define LOG_CALLSTACK() log_callstack(__func__, __LINE__)
# define LOG_CALLSTACK_TO_FILE(fp) log_callstack_to_file(fp, __func__, __LINE__)
#endif
#ifdef INCLUDE_GENERATED_DECLARATIONS