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Wrap const_eval_stack_frame_limit in a LockCell #56085

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Wrap const_eval_stack_frame_limit in a LockCell #56085

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c1e70fb
Wrap const_eval_stack_frame_limit in a OneThread<Cell>
Aaron1011 Nov 19, 2018
038727f
Use LockCell instead of OneThread<Cell>
Aaron1011 Nov 20, 2018
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4 changes: 2 additions & 2 deletions src/librustc/session/mod.rs
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Expand Up @@ -107,7 +107,7 @@ pub struct Session {
pub type_length_limit: Once<usize>,

/// The maximum number of stackframes allowed in const eval
pub const_eval_stack_frame_limit: usize,
pub const_eval_stack_frame_limit: LockCell<usize>,

/// The metadata::creader module may inject an allocator/panic_runtime
/// dependency if it didn't already find one, and this tracks what was
Expand Down Expand Up @@ -1159,7 +1159,7 @@ pub fn build_session_(
features: Once::new(),
recursion_limit: Once::new(),
type_length_limit: Once::new(),
const_eval_stack_frame_limit: 100,
const_eval_stack_frame_limit: LockCell::new(100),
next_node_id: OneThread::new(Cell::new(NodeId::from_u32(1))),
allocator_kind: Once::new(),
injected_panic_runtime: Once::new(),
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2 changes: 1 addition & 1 deletion src/librustc_mir/interpret/eval_context.rs
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Expand Up @@ -489,7 +489,7 @@ impl<'a, 'mir, 'tcx: 'mir, M: Machine<'a, 'mir, 'tcx>> EvalContext<'a, 'mir, 'tc
debug!("ENTERING({}) {}", self.cur_frame(), self.frame().instance);
}

if self.stack.len() > self.tcx.sess.const_eval_stack_frame_limit {
if self.stack.len() > self.tcx.sess.const_eval_stack_frame_limit.get() {
err!(StackFrameLimitReached)
} else {
Ok(())
Expand Down