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gh-137291: Support perf profiler with an evaluation hook (#137292)

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Support perf profiler with an evaluation hook
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Dino Viehland 2025-08-07 14:54:12 -07:00 • committed by GitHub
parent e3ad9003c5
commit 375f484f97
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4 changed files with 54 additions and 47 deletions
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18
Python/perf_trampoline.c
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@ -202,6 +202,7 @@ enum perf_trampoline_type {
#define perf_map_file _PyRuntime.ceval.perf.map_file
#define persist_after_fork _PyRuntime.ceval.perf.persist_after_fork
#define perf_trampoline_type _PyRuntime.ceval.perf.perf_trampoline_type
#define prev_eval_frame _PyRuntime.ceval.perf.prev_eval_frame
static void
perf_map_write_entry(void *state, const void *code_addr,
@ -407,9 +408,12 @@ py_trampoline_evaluator(PyThreadState *ts, _PyInterpreterFrame *frame,
f = new_trampoline;
}
assert(f != NULL);
return f(ts, frame, throw, _PyEval_EvalFrameDefault);
return f(ts, frame, throw, prev_eval_frame != NULL ? prev_eval_frame : _PyEval_EvalFrameDefault);
default_eval:
// Something failed, fall back to the default evaluator.
if (prev_eval_frame) {
return prev_eval_frame(ts, frame, throw);
}
return _PyEval_EvalFrameDefault(ts, frame, throw);
}
#endif // PY_HAVE_PERF_TRAMPOLINE
@ -481,18 +485,12 @@ _PyPerfTrampoline_Init(int activate)
{
#ifdef PY_HAVE_PERF_TRAMPOLINE
PyThreadState *tstate = _PyThreadState_GET();
if (tstate->interp->eval_frame &&
tstate->interp->eval_frame != py_trampoline_evaluator) {
PyErr_SetString(PyExc_RuntimeError,
"Trampoline cannot be initialized as a custom eval "
"frame is already present");
return -1;
}
if (!activate) {
_PyInterpreterState_SetEvalFrameFunc(tstate->interp, NULL);
_PyInterpreterState_SetEvalFrameFunc(tstate->interp, prev_eval_frame);
perf_status = PERF_STATUS_NO_INIT;
}
else {
else if (tstate->interp->eval_frame != py_trampoline_evaluator) {
prev_eval_frame = _PyInterpreterState_GetEvalFrameFunc(tstate->interp);
_PyInterpreterState_SetEvalFrameFunc(tstate->interp, py_trampoline_evaluator);
extra_code_index = _PyEval_RequestCodeExtraIndex(NULL);
if (extra_code_index == -1) {