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[3.13] gh-123048: Fix missing source location in pattern matching code (GH-123167) (#123169)
gh-123048: Fix missing source location in pattern matching code (GH-123167)
(cherry picked from commit bffed80230
)
Co-authored-by: Irit Katriel <1055913+iritkatriel@users.noreply.github.com>
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@ -1,6 +1,7 @@
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import array
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import collections
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import dataclasses
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import dis
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import enum
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import inspect
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import sys
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@ -3377,6 +3378,24 @@ class TestValueErrors(unittest.TestCase):
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self.assertIs(y, None)
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self.assertIs(z, None)
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class TestSourceLocations(unittest.TestCase):
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def test_jump_threading(self):
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# See gh-123048
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def f():
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x = 0
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v = 1
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match v:
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case 1:
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if x < 0:
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x = 1
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case 2:
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if x < 0:
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x = 1
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x += 1
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for inst in dis.get_instructions(f):
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if inst.opcode in dis.hasjump:
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self.assertIsNotNone(inst.positions.lineno, "jump without location")
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class TestTracing(unittest.TestCase):
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@ -0,0 +1,2 @@
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Fix a bug where pattern matching code could emit a :opcode:`JUMP_FORWARD`
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with no source location.
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@ -7478,7 +7478,7 @@ compiler_match_inner(struct compiler *c, stmt_ty s, pattern_context *pc)
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ADDOP(c, LOC(m->pattern), POP_TOP);
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}
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VISIT_SEQ(c, stmt, m->body);
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ADDOP_JUMP(c, NO_LOCATION, JUMP_NO_INTERRUPT, end);
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ADDOP_JUMP(c, NO_LOCATION, JUMP, end);
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// If the pattern fails to match, we want the line number of the
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// cleanup to be associated with the failed pattern, not the last line
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// of the body
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