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gh-138714: Don't assume next block has instructions when propagating line numbers (#138770)

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Co-authored-by: Irit Katriel <iritkatriel@yahoo.com>
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Dino Viehland 2025-09-17 17:52:56 +01:00 • committed by GitHub
parent 4b78fe9665
commit e92599e677
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2 changed files with 30 additions and 13 deletions
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32
Python/flowgraph.c
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@ -3591,8 +3591,19 @@ duplicate_exits_without_lineno(cfg_builder *g)
* Also reduces the size of the line number table,
* but has no impact on the generated line number events.
*/
static inline void
maybe_propagate_location(basicblock *b, int i, location loc)
{
assert(b->b_iused > i);
if (b->b_instr[i].i_loc.lineno == NO_LOCATION.lineno) {
b->b_instr[i].i_loc = loc;
}
}
static void
propagate_line_numbers(basicblock *entryblock) {
propagate_line_numbers(basicblock *entryblock)
{
for (basicblock *b = entryblock; b != NULL; b = b->b_next) {
cfg_instr *last = basicblock_last_instr(b);
if (last == NULL) {
@ -3601,26 +3612,21 @@ propagate_line_numbers(basicblock *entryblock) {
location prev_location = NO_LOCATION;
for (int i = 0; i < b->b_iused; i++) {
if (b->b_instr[i].i_loc.lineno == NO_LOCATION.lineno) {
b->b_instr[i].i_loc = prev_location;
}
else {
prev_location = b->b_instr[i].i_loc;
}
maybe_propagate_location(b, i, prev_location);
prev_location = b->b_instr[i].i_loc;
}
if (BB_HAS_FALLTHROUGH(b) && b->b_next->b_predecessors == 1) {
if (b->b_next->b_iused > 0) {
if (b->b_next->b_instr[0].i_loc.lineno == NO_LOCATION.lineno) {
b->b_next->b_instr[0].i_loc = prev_location;
}
maybe_propagate_location(b->b_next, 0, prev_location);
}
}
if (is_jump(last)) {
basicblock *target = last->i_target;
while (target->b_iused == 0 && target->b_predecessors == 1) {
target = target->b_next;
}
if (target->b_predecessors == 1) {
if (target->b_instr[0].i_loc.lineno == NO_LOCATION.lineno) {
target->b_instr[0].i_loc = prev_location;
}
maybe_propagate_location(target, 0, prev_location);
}
}
}