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bpo-42246: Don't forget the entry block when ensuring that all exits have a line number (GH-23636)

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Don't forget the entry block when ensuring that all exits have a line number.
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Mark Shannon 2020-12-04 15:22:12 +00:00 • committed by GitHub
parent f24b8101a0
commit eaccc12aa9
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4 changed files with 28 additions and 4 deletions
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6
Python/compile.c
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@ -6514,6 +6514,7 @@ is_exit_without_lineno(basicblock *b) {
static int
ensure_exits_have_lineno(struct compiler *c)
{
basicblock *entry = NULL;
/* Copy all exit blocks without line number that are targets of a jump.
*/
for (basicblock *b = c->u->u_blocks; b != NULL; b = b->b_list) {
@ -6535,6 +6536,11 @@ ensure_exits_have_lineno(struct compiler *c)
b->b_instr[b->b_iused-1].i_target = new_target;
}
}
entry = b;
}
assert(entry != NULL);
if (is_exit_without_lineno(entry)) {
entry->b_instr[0].i_lineno = c->u->u_firstlineno;
}
/* Any remaining reachable exit blocks without line number can only be reached by
* fall through, and thus can only have a single predecessor */