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GH-115419: Move setting the instruction pointer to error exit stubs #118088

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Merged
merged 3 commits into from
Apr 24, 2024
Merged

GH-115419: Move setting the instruction pointer to error exit stubs #118088

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6b00b12
Move SET_IP from the main trace to error stubs where possible.
markshannon Apr 19, 2024
ed60e2e
Merge branch 'main' into move-set-ip-to-exits
markshannon Apr 19, 2024
75acbe1
Fix test
markshannon Apr 19, 2024
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2 changes: 1 addition & 1 deletion Lib/test/test_capi/test_opt.py
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Original file line number Diff line number Diff line change
Expand Up @@ -231,7 +231,7 @@ def testfunc(x):
ex = get_first_executor(testfunc)
self.assertIsNotNone(ex)
uops = get_opnames(ex)
self.assertIn("_SET_IP", uops)
self.assertIn("_JUMP_TO_TOP", uops)
self.assertIn("_LOAD_FAST_0", uops)

def test_extended_arg(self):
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3 changes: 2 additions & 1 deletion Python/bytecodes.c
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Expand Up @@ -4202,7 +4202,8 @@ dummy_func(
EXIT_TO_TRACE();
}

tier2 op(_ERROR_POP_N, (unused[oparg] --)) {
tier2 op(_ERROR_POP_N, (target/2, unused[oparg] --)) {
frame->instr_ptr = ((_Py_CODEUNIT *)_PyFrame_GetCode(frame)->co_code_adaptive) + target;
SYNC_SP();
GOTO_UNWIND();
}
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2 changes: 2 additions & 0 deletions Python/executor_cases.c.h
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1 change: 1 addition & 0 deletions Python/optimizer.c
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Expand Up @@ -971,6 +971,7 @@ prepare_for_execution(_PyUOpInstruction *buffer, int length)
current_error_target = target;
make_exit(&buffer[next_spare], _ERROR_POP_N, 0);
buffer[next_spare].oparg = popped;
buffer[next_spare].operand = target;
next_spare++;
}
buffer[i].error_target = current_error;
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3 changes: 0 additions & 3 deletions Python/optimizer_analysis.c
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Expand Up @@ -553,9 +553,6 @@ remove_unneeded_uops(_PyUOpInstruction *buffer, int buffer_size)
needs_ip = true;
may_have_escaped = true;
}
if (_PyUop_Flags[opcode] & HAS_ERROR_FLAG) {
needs_ip = true;
}
if (needs_ip && last_set_ip >= 0) {
if (buffer[last_set_ip].opcode == _CHECK_VALIDITY) {
buffer[last_set_ip].opcode = _CHECK_VALIDITY_AND_SET_IP;
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