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GH-93516: Speedup line number checks when tracing. (GH-93763)

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* Use a lookup table to reduce overhead of getting line numbers during tracing.
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Mark Shannon 2022-06-20 13:00:42 +01:00 • committed by GitHub
parent 45e62a2bc1
commit ab0e601016
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6 changed files with 101 additions and 8 deletions
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16
Python/ceval.c
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@ -6799,9 +6799,10 @@ call_trace(Py_tracefunc func, PyObject *obj,
tstate->tracing_what = what;
PyThreadState_EnterTracing(tstate);
assert(_PyInterpreterFrame_LASTI(frame) >= 0);
initialize_trace_info(&tstate->trace_info, frame);
int addr = _PyInterpreterFrame_LASTI(frame) * sizeof(_Py_CODEUNIT);
f->f_lineno = _PyCode_CheckLineNumber(addr, &tstate->trace_info.bounds);
if (_PyCode_InitLineArray(frame->f_code)) {
return -1;
}
f->f_lineno = _PyCode_LineNumberFromArray(frame->f_code, _PyInterpreterFrame_LASTI(frame));
result = func(obj, f, what, arg);
f->f_lineno = 0;
PyThreadState_LeaveTracing(tstate);
@ -6838,16 +6839,17 @@ maybe_call_line_trace(Py_tracefunc func, PyObject *obj,
represents a jump backwards, update the frame's line number and
then call the trace function if we're tracing source lines.
*/
initialize_trace_info(&tstate->trace_info, frame);
if (_PyCode_InitLineArray(frame->f_code)) {
return -1;
}
int lastline;
if (instr_prev <= frame->f_code->_co_firsttraceable) {
lastline = -1;
}
else {
lastline = _PyCode_CheckLineNumber(instr_prev*sizeof(_Py_CODEUNIT), &tstate->trace_info.bounds);
lastline = _PyCode_LineNumberFromArray(frame->f_code, instr_prev);
}
int addr = _PyInterpreterFrame_LASTI(frame) * sizeof(_Py_CODEUNIT);
int line = _PyCode_CheckLineNumber(addr, &tstate->trace_info.bounds);
int line = _PyCode_LineNumberFromArray(frame->f_code, _PyInterpreterFrame_LASTI(frame));
PyFrameObject *f = _PyFrame_GetFrameObject(frame);
if (f == NULL) {
return -1;