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Add Python ftrace contextmanager (#285)

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Gautham 2021-10-13 23:30:25 +05:30 • committed by GitHub
parent 425a57080d
commit d852640a1e
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3 changed files with 82 additions and 20 deletions
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4
libc/runtime/ftracer.c
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@ -43,6 +43,7 @@
void ftrace_hook(void);
bool ftrace_enabled;
static int g_skew;
static int g_lastsymbol;
static uint64_t laststamp;
@ -80,7 +81,7 @@ privileged noinstrument noasan void ftracer(void) {
static bool noreentry;
struct StackFrame *frame;
if (!cmpxchg(&noreentry, 0, 1)) return;
if (g_symbols) {
if (ftrace_enabled && g_symbols) {
stamp = rdtsc();
frame = __builtin_frame_address(0);
frame = frame->next;
@ -103,6 +104,7 @@ textstartup void ftrace_install(void) {
laststamp = kStartTsc;
g_lastsymbol = -1;
g_skew = GetNestingLevelImpl(__builtin_frame_address(0));
ftrace_enabled = 1;
__hook(ftrace_hook, g_symbols);
} else {
__printf("error: --ftrace failed to open symbol table\r\n");