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gh-132732: Clear errors in JIT optimizer on error #136048

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Merged
merged 7 commits into from
Sep 15, 2025
Merged

gh-132732: Clear errors in JIT optimizer on error #136048

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267ecf7
Clear errors in JIT optimizer
Fidget-Spinner Jun 27, 2025
34c3f2b
remove ability to return error
Fidget-Spinner Jun 27, 2025
4eb9781
add assert
Fidget-Spinner Jun 27, 2025
412ec63
Update optimizer_analysis.c
Fidget-Spinner Jul 3, 2025
26e2978
Update optimizer_analysis.c
Fidget-Spinner Jul 3, 2025
87505e1
Update comment
Fidget-Spinner Sep 2, 2025
2f256d4
Merge remote-tracking branch 'upstream/main' into clear-error-on-opti…
Fidget-Spinner Sep 2, 2025
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15 changes: 11 additions & 4 deletions Python/optimizer_analysis.c
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Original file line number Diff line number Diff line change
Expand Up @@ -461,7 +461,7 @@ const uint16_t op_without_decref_inputs[MAX_UOP_ID + 1] = {
[_BINARY_OP_SUBTRACT_FLOAT] = _BINARY_OP_SUBTRACT_FLOAT__NO_DECREF_INPUTS,
};

/* 1 for success, 0 for not ready, cannot error at the moment. */
/* 1 for success, 0 for not ready, clears all possible errors. */
static int
optimize_uops(
PyCodeObject *co,
Expand All @@ -471,6 +471,7 @@ optimize_uops(
_PyBloomFilter *dependencies
)
{
assert(!PyErr_Occurred());

JitOptContext context;
JitOptContext *ctx = &context;
Expand All @@ -483,7 +484,7 @@ optimize_uops(
_Py_uop_abstractcontext_init(ctx);
_Py_UOpsAbstractFrame *frame = _Py_uop_frame_new(ctx, co, curr_stacklen, NULL, 0);
if (frame == NULL) {
return -1;
return 0;
}
ctx->curr_frame_depth++;
ctx->frame = frame;
Expand Down Expand Up @@ -557,7 +558,11 @@ optimize_uops(
OPT_ERROR_IN_OPCODE(opcode);
}
_Py_uop_abstractcontext_fini(ctx);
return -1;

if (PyErr_Occurred()) {
PyErr_Clear();
}
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Shouldn't this be:

Suggested change
if (PyErr_Occurred()) {
PyErr_Clear();
}
assert(PyErr_Occurred());
PyErr_Clear();

...or are there cases where an error hasn't occurred, but we end up here?

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I think the current code goes to error on some cases where we run out of memory too, but no memoryerror is set.

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I don't think so, all uses of goto error in these files seem like they have an error set.

return 0;

}

Expand Down Expand Up @@ -704,10 +709,12 @@ _Py_uop_analyze_and_optimize(
_PyFrame_GetCode(frame), buffer,
length, curr_stacklen, dependencies);

if (length <= 0) {
if (length == 0) {
return length;
}

assert(length > 0);

length = remove_unneeded_uops(buffer, length);
assert(length > 0);

Expand Down
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