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Improve performance of printf functions

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This commit is contained in:
Justine Tunney 2021-04-24 13:58:34 -07:00
parent b107d2709f
commit dc6d11a031
39 changed files with 577 additions and 650 deletions
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46
libc/runtime/ftrace.c
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@ -106,44 +106,12 @@ privileged noasan void ftrace(void) {
noreentry = 0;
}
/**
* Enables plaintext function tracing if `--ftrace` flag is passed.
*
* The `--ftrace` CLI arg is removed before main() is called. This code
* is intended for diagnostic purposes and assumes binaries are
* trustworthy and stack isn't corrupted. Logging plain text allows
* program structure to easily be visualized and hotspots identified w/
* `sed | sort | uniq -c | sort`. A compressed trace can be made by
* appending `--ftrace 2>&1 | gzip -4 >trace.gz` to the CLI arguments.
*
* @see libc/runtime/_init.S for documentation
*/
textstartup int ftrace_init(int argc, char *argv[]) {
int i;
bool foundflag;
foundflag = false;
for (i = 1; i <= argc; ++i) {
if (!foundflag) {
if (argv[i]) {
if (strcmp(argv[i], "--ftrace") == 0) {
foundflag = true;
} else if (strcmp(argv[i], "----ftrace") == 0) {
strcpy(argv[i], "--ftrace");
}
}
} else {
argv[i - 1] = argv[i];
}
textstartup void ftrace_install(void) {
g_buf[0] = '+';
g_buf[1] = ' ';
if ((g_symbols = OpenSymbolTable(FindDebugBinary()))) {
__hook(ftrace_hook, g_symbols);
} else {
write(2, "error: --ftrace needs the concomitant .com.dbg binary\n", 54);
}
if (foundflag) {
--argc;
g_buf[0] = '+';
g_buf[1] = ' ';
if ((g_symbols = OpenSymbolTable(FindDebugBinary()))) {
__hook(ftrace_hook, g_symbols);
} else {
write(2, "error: --ftrace needs the concomitant .com.dbg binary\n", 54);
}
}
return argc;
}