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gh-115420: Fix translation of exception hander targets by _testinternalcapi.optimize_cfg. #115425

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Feb 15, 2024
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gh-115420: Fix translation of exception hander targets by _testinternalcapi.optimize_cfg. #115425

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16 changes: 16 additions & 0 deletions Lib/test/test_peepholer.py
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Original file line number Diff line number Diff line change
Expand Up @@ -1065,6 +1065,22 @@ def test_conditional_jump_backward_const_condition(self):
]
self.cfg_optimization_test(insts, expected_insts, consts=list(range(5)))

def test_except_handler_label(self):
insts = [
('SETUP_FINALLY', handler := self.Label(), 10),
('POP_BLOCK', 0, -1),
('RETURN_CONST', 1, 11),
handler,
('RETURN_CONST', 2, 12),
]
expected_insts = [
('SETUP_FINALLY', handler := self.Label(), 10),
('RETURN_CONST', 1, 11),
handler,
('RETURN_CONST', 2, 12),
]
self.cfg_optimization_test(insts, expected_insts, consts=list(range(5)))

def test_no_unsafe_static_swap(self):
# We can't change order of two stores to the same location
insts = [
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2 changes: 2 additions & 0 deletions Misc/NEWS.d/next/Tests/2024-02-13-18-24-04.gh-issue-115420.-dlzfI.rst
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Original file line number Diff line number Diff line change
@@ -0,0 +1,2 @@
Fix translation of exception hander targets by
``_testinternalcapi.optimize_cfg``.
2 changes: 1 addition & 1 deletion Python/flowgraph.c
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Expand Up @@ -2729,7 +2729,7 @@ _PyCfg_ToInstructionSequence(cfg_builder *g, _PyCompile_InstructionSequence *seq
RETURN_IF_ERROR(_PyCompile_InstructionSequence_UseLabel(seq, b->b_label.id));
for (int i = 0; i < b->b_iused; i++) {
cfg_instr *instr = &b->b_instr[i];
if (OPCODE_HAS_JUMP(instr->i_opcode)) {
if (OPCODE_HAS_JUMP(instr->i_opcode) || is_block_push(instr)) {
instr->i_oparg = instr->i_target->b_label.id;
}
RETURN_IF_ERROR(
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