8000 gh-104584: Fix error handling from backedge optimization by gvanrossum · Pull Request #106484 · python/cpython · GitHub
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gh-104584: Fix error handling from backedge optimization #106484

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Merged
merged 3 commits into from
Jul 6, 2023
Merged

gh-104584: Fix error handling from backedge optimization #106484

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a57ca7a
On _PyOptimizer_BackEdge fail, use resume logic
gvanrossum Jul 6, 2023
9a911cb
Improve offsets in debug output
gvanrossum Jul 5, 2023
94d567b
Prevent warnings
gvanrossum Jul 6, 2023
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Improve offsets in debug output 
Offsets in debug output identifying the start of the trace
are now measured in bytes (and the text shows it).
  • Loading branch information
@gvanrossum
gvanrossum committed Jul 6, 2023
commit 9a911cb4ba20e41a2b28667d8b2ed32fe3f8e3c4
4 changes: 2 additions & 2 deletions Python/ceval.c
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Original file line number Diff line number Diff line change
Expand Up @@ -2737,11 +2737,11 @@ _PyUopExecute(_PyExecutorObject *executor, _PyInterpreterFrame *frame, PyObject
#endif

DPRINTF(3,
"Entering _PyUopExecute for %s (%s:%d) at offset %ld\n",
"Entering _PyUopExecute for %s (%s:%d) at byte offset %ld\n",
PyUnicode_AsUTF8(_PyFrame_GetCode(frame)->co_qualname),
PyUnicode_AsUTF8(_PyFrame_GetCode(frame)->co_filename),
_PyFrame_GetCode(frame)->co_firstlineno,
(long)(frame->prev_instr + 1 -
2 * (long)(frame->prev_instr + 1 -
(_Py_CODEUNIT *)_PyFrame_GetCode(frame)->co_code_adaptive));

PyThreadState *tstate = _PyThreadState_GET();
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16 changes: 9 additions & 7 deletions Python/optimizer.c
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Expand Up @@ -181,6 +181,7 @@ _PyOptimizer_BackEdge(_PyInterpreterFrame *frame, _Py_CODEUNIT *src, _Py_CODEUNI
}
insert_executor(code, src, index, executor);
assert(frame->prev_instr == src);
frame->prev_instr = dest - 1;
return executor->execute(executor, frame, stack_pointer);
jump_to_destination:
frame->prev_instr = dest - 1;
Expand All @@ -201,7 +202,7 @@ PyUnstable_GetExecutor(PyCodeObject *code, int offset)
}
i += _PyInstruction_GetLength(code, i);
}
PyErr_SetString(PyExc_ValueError, "no executor at given offset");
PyErr_SetString(PyExc_ValueError, "no executor at given byte offset");
return NULL;
}

Expand Down Expand Up @@ -373,6 +374,7 @@ translate_bytecode_to_trace(
_PyUOpInstruction *trace,
int max_length)
{
_Py_CODEUNIT *initial_instr = instr;
int trace_length = 0;

#ifdef Py_DEBUG
Expand All @@ -398,11 +400,11 @@ translate_bytecode_to_trace(
trace_length++;

DPRINTF(4,
"Optimizing %s (%s:%d) at offset %ld\n",
"Optimizing %s (%s:%d) at byte offset %ld\n",
PyUnicode_AsUTF8(code->co_qualname),
PyUnicode_AsUTF8(code->co_filename),
code->co_firstlineno,
(long)(instr - (_Py_CODEUNIT *)code->co_code_adaptive));
2 * (long)(initial_instr - (_Py_CODEUNIT *)code->co_code_adaptive));

for (;;) {
ADD_TO_TRACE(SAVE_IP, (int)(instr - (_Py_CODEUNIT *)code->co_code_adaptive));
Expand Down Expand Up @@ -492,21 +494,21 @@ translate_bytecode_to_trace(
if (trace_length > 3) {
ADD_TO_TRACE(EXIT_TRACE, 0);
DPRINTF(1,
"Created a trace for %s (%s:%d) at offset %ld -- length %d\n",
"Created a trace for %s (%s:%d) at byte offset %ld -- length %d\n",
PyUnicode_AsUTF8(code->co_qualname),
PyUnicode_AsUTF8(code->co_filename),
code->co_firstlineno,
(long)(instr - (_Py_CODEUNIT *)code->co_code_adaptive),
2 * (long)(initial_instr - (_Py_CODEUNIT *)code->co_code_adaptive),
trace_length);
return trace_length;
}
else {
DPRINTF(4,
"No trace for %s (%s:%d) at offset %ld\n",
"No trace for %s (%s:%d) at byte offset %ld\n",
PyUnicode_AsUTF8(code->co_qualname),
PyUnicode_AsUTF8(code->co_filename),
code->co_firstlineno,
4AD1 (long)(instr - (_Py_CODEUNIT *)code->co_code_adaptive));
2 * (long)(initial_instr - (_Py_CODEUNIT *)code->co_code_adaptive));
}
return 0;

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0