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gh-107901: duplicate blocks with no lineno that have an eval break and multiple predecessors (#113950)

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Irit Katriel 2024-01-12 15:38:09 +00:00 • committed by GitHub
parent e02c15b3f1
commit 8aa0088ea2
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3 changed files with 38 additions and 10 deletions
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32
Python/flowgraph.c
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@ -316,6 +316,16 @@ basicblock_exits_scope(const basicblock *b) {
return last && IS_SCOPE_EXIT_OPCODE(last->i_opcode);
}
static inline int
basicblock_has_eval_break(const basicblock *b) {
for (int i = 0; i < b->b_iused; i++) {
if (OPCODE_HAS_EVAL_BREAK(b->b_instr[i].i_opcode)) {
return true;
}
}
return false;
}
static bool
cfg_builder_current_block_is_terminated(cfg_builder *g)
{
@ -2246,16 +2256,18 @@ convert_pseudo_ops(basicblock *entryblock)
}
static inline bool
is_exit_without_lineno(basicblock *b) {
if (!basicblock_exits_scope(b)) {
is_exit_or_eval_check_without_lineno(basicblock *b) {
if (basicblock_exits_scope(b) || basicblock_has_eval_break(b)) {
for (int i = 0; i < b->b_iused; i++) {
if (b->b_instr[i].i_loc.lineno >= 0) {
return false;
}
}
return true;
}
else {
return false;
}
for (int i = 0; i < b->b_iused; i++) {
if (b->b_instr[i].i_loc.lineno >= 0) {
return false;
}
}
return true;
}
@ -2283,7 +2295,7 @@ duplicate_exits_without_lineno(cfg_builder *g)
}
if (is_jump(last)) {
basicblock *target = next_nonempty_block(last->i_target);
if (is_exit_without_lineno(target) && target->b_predecessors > 1) {
if (is_exit_or_eval_check_without_lineno(target) && target->b_predecessors > 1) {
basicblock *new_target = copy_basicblock(g, target);
if (new_target == NULL) {
return ERROR;
@ -2303,7 +2315,7 @@ duplicate_exits_without_lineno(cfg_builder *g)
* fall through, and thus can only have a single predecessor */
for (basicblock *b = entryblock; b != NULL; b = b->b_next) {
if (BB_HAS_FALLTHROUGH(b) && b->b_next && b->b_iused > 0) {
if (is_exit_without_lineno(b->b_next)) {
if (is_exit_or_eval_check_without_lineno(b->b_next)) {
cfg_instr *last = basicblock_last_instr(b);
assert(last != NULL);
b->b_next->b_instr[0].i_loc = last->i_loc;