diff --git a/Lib/test/test_compile.py b/Lib/test/test_compile.py index ba0bcc9c1ced99..ae23aea08d99bc 100644 --- a/Lib/test/test_compile.py +++ b/Lib/test/test_compile.py @@ -1409,6 +1409,16 @@ def f(): for kw in ("except", "except*"): exec(code % kw, g, l); + def test_regression_gh_120225(self): + async def name_4(): + match b'': + case True: + pass + case name_5 if f'e': + {name_3: name_4 async for name_2 in name_5} + case []: + pass + [[]] @requires_debug_ranges() class TestSourcePositions(unittest.TestCase): diff --git a/Misc/NEWS.d/next/Core and Builtins/2024-06-07-16-09-04.gh-issue-120225.kuYf9t.rst b/Misc/NEWS.d/next/Core and Builtins/2024-06-07-16-09-04.gh-issue-120225.kuYf9t.rst new file mode 100644 index 00000000000000..d00b9aaa8192e3 --- /dev/null +++ b/Misc/NEWS.d/next/Core and Builtins/2024-06-07-16-09-04.gh-issue-120225.kuYf9t.rst @@ -0,0 +1 @@ +Fix crash in compiler on empty block at end of exception handler. diff --git a/Python/flowgraph.c b/Python/flowgraph.c index 17617e119fdaa4..aed694aee91f91 100644 --- a/Python/flowgraph.c +++ b/Python/flowgraph.c @@ -2304,15 +2304,11 @@ push_cold_blocks_to_end(cfg_builder *g) { if (!IS_LABEL(b->b_next->b_label)) { b->b_next->b_label.id = next_lbl++; } - cfg_instr *prev_instr = basicblock_last_instr(b); - // b cannot be empty because at the end of an exception handler - // there is always a POP_EXCEPT + RERAISE/RETURN - assert(prev_instr); - basicblock_addop(explicit_jump, JUMP_NO_INTERRUPT, b->b_next->b_label.id, - prev_instr->i_loc); + NO_LOCATION); explicit_jump->b_cold = 1; explicit_jump->b_next = b->b_next; + explicit_jump->b_predecessors = 1; b->b_next = explicit_jump; /* set target */