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gh-107901: Fix missing line number on BACKWARD_JUMP at the end of a for loop by iritkatriel · Pull Request #108242 · python/cpython · GitHub

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gh-107901: Fix missing line number on BACKWARD_JUMP at the end of a for loop #108242

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Merged
iritkatriel merged 2 commits into from
Aug 21, 2023
+16 −1
Conversation 8 Commits 2 Checks 0 Files changed 3
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gh-107901: Fix missing line number on BACKWARD_JUMP at the end of a for loop #108242

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Fix missing line number on :opcode:`BACKWARD_JUMP` at the end of a fo…
iritkatriel Aug 21, 2023
4c65946
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iritkatriel Aug 21, 2023
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14 changes: 14 additions & 0 deletions Lib/test/test_compile.py
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Original file line number Diff line number Diff line change
Expand Up @@ -1031,6 +1031,20 @@ async def test(aseq):
code_lines = self.get_code_lines(test.__code__)
self.assertEqual(expected_lines, code_lines)

def test_lineno_of_backward_jump(self):
# Issue gh-107901
def f():
for i in x:
if y:
pass

linenos = list(inst.positions.lineno
for inst in dis.get_instructions(f.__code__)
if inst.opname == 'JUMP_BACKWARD')

self.assertTrue(len(linenos) > 0)
self.assertTrue(all(l is not None for l in linenos))

def test_big_dict_literal(self):
# The compiler has a flushing point in "compiler_dict" that calls compiles
# a portion of the dictionary literal when the loop that iterates over the items
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1 change: 1 addition & 0 deletions Misc/NEWS.d/next/Core and Builtins/2023-08-21-21-13-30.gh-issue-107901.hszvdk.rst
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Original file line number Diff line number Diff line change
@@ -0,0 +1 @@
Fix missing line number on :opcode:`JUMP_BACKWARD` at the end of a for loop.
2 changes: 1 addition & 1 deletion Python/flowgraph.c
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Original file line number Diff line number Diff line change
Expand Up @@ -531,7 +531,7 @@ normalize_jumps_in_block(cfg_builder *g, basicblock *b) {
if (backwards_jump == NULL) {
return ERROR;
}
basicblock_addop(backwards_jump, JUMP, target->b_label.id, NO_LOCATION);
basicblock_addop(backwards_jump, JUMP, target->b_label.id, last->i_loc);

markshannon Aug 22, 2023

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Choose a reason Spam Abuse Off Topic Outdated Duplicate Resolved Low Quality

This is the last physical location, not the last location executed. Won't it give the wrong line for the following?

ALWAYS_TRUE= True

def foo():
    while 1:
        if ALWAYS_TRUE:
            pass # last line executed
        else:
            pass # last physical line

iritkatriel Aug 22, 2023 •
edited
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Choose a reason Spam Abuse Off Topic Outdated Duplicate Resolved Low Quality

no, last is the conditional backwards jump that this jump is replacing (and which is replaced by a forward jump).
backwards_jump->b_instr[0].i_target = target;
last->i_opcode = reversed_opcode;
last->i_target = b->b_next;
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