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Fix stack error when with-statement __exit__ raises exception #5273

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Merged
merged 2 commits into from
Apr 25, 2024
Merged

Fix stack error when with-statement __exit__ raises exception #5273

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870f1bb
popblock debug
youknowone Apr 24, 2024
8b1b1e4
Fix with __exit__ error handling
youknowone Apr 25, 2024
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25 changes: 21 additions & 4 deletions vm/src/frame.rs
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Original file line number Diff line number Diff line change
Expand Up @@ -925,15 +925,15 @@ impl ExecutingFrame<'_> {
_ => None,
};

let exit = self.pop_value();
let exit = self.top_value();

let args = if let Some(exc) = exc {
vm.split_exception(exc)
} else {
(vm.ctx.none(), vm.ctx.none(), vm.ctx.none())
};
let exit_res = exit.call(args, vm)?;
self.push_value(exit_res);
self.replace_top(exit_res);

Ok(None)
}
Expand Down Expand Up @@ -994,7 +994,7 @@ impl ExecutingFrame<'_> {
}
bytecode::Instruction::GetANext => {
let aiter = self.top_value();
let awaitable = vm.call_special_method(&aiter, identifier!(vm, __anext__), ())?;
let awaitable = vm.call_special_method(aiter, identifier!(vm, __anext__), ())?;
let awaitable = if awaitable.payload_is::<PyCoroutine>() {
awaitable
} else {
Expand Down Expand Up @@ -1911,8 +1911,18 @@ impl ExecutingFrame<'_> {
});
}

#[track_caller]
fn pop_block(&mut self) -> Block {
let block = self.state.blocks.pop().expect("No more blocks to pop!");
#[cfg(debug_assertions)]
if self.state.stack.len() < block.level {
dbg!(&self);
panic!(
"stack size reversion: current size({}) < truncates target({}).",
self.state.stack.len(),
block.level
);
}
self.state.stack.truncate(block.level);
block
}
Expand Down Expand Up @@ -1945,7 +1955,14 @@ impl ExecutingFrame<'_> {
}

#[inline]
#[track_caller] // not a real track_caller but pop_value is not very useful
fn replace_top(&mut self, mut top: PyObjectRef) -> PyObjectRef {
let last = self.state.stack.last_mut().unwrap();
std::mem::swap(&mut top, last);
top
}

#[inline]
#[track_caller] // not a real track_caller but top_value is not very useful
fn top_value(&self) -> &PyObject {
match &*self.state.stack {
[.., last] => last,
Expand Down