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gh-93554: Conditional jump opcodes only jump forward (GH-96318)

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Irit Katriel 2022-09-01 21:36:47 +01:00 • committed by GitHub
parent a91f25577c
commit 4c72517cad
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13 changed files with 298 additions and 448 deletions
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19
Objects/frameobject.c
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@ -311,25 +311,12 @@ mark_stacks(PyCodeObject *code_obj, int len)
switch (opcode) {
case JUMP_IF_FALSE_OR_POP:
case JUMP_IF_TRUE_OR_POP:
case POP_JUMP_FORWARD_IF_FALSE:
case POP_JUMP_BACKWARD_IF_FALSE:
case POP_JUMP_FORWARD_IF_TRUE:
case POP_JUMP_BACKWARD_IF_TRUE:
case POP_JUMP_IF_FALSE:
case POP_JUMP_IF_TRUE:
{
int64_t target_stack;
int j = get_arg(code, i);
if (opcode == POP_JUMP_FORWARD_IF_FALSE ||
opcode == POP_JUMP_FORWARD_IF_TRUE ||
opcode == JUMP_IF_FALSE_OR_POP ||
opcode == JUMP_IF_TRUE_OR_POP)
{
j += i + 1;
}
else {
assert(opcode == POP_JUMP_BACKWARD_IF_FALSE ||
opcode == POP_JUMP_BACKWARD_IF_TRUE);
j = i + 1 - j;
}
j += i + 1;
assert(j < len);
if (stacks[j] == UNINITIALIZED && j < i) {
todo = 1;