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

* Use a lookup table to reduce overhead of getting line numbers during tracing.

1 files changed, 9 insertions, 7 deletions

diff --git a/Python/ceval.c b/Python/ceval.c
index 19b2bb4..a23ed58 100644
--- a/Python/ceval.c
+++ b/Python/ceval.c
@@ -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;