Skip to content

Substitute types before checking inlining compatibility. #113802

New issue

Have a question about this project? Sign up for a free GitHub account to open an issue and contact its maintainers and the community.

Sign up for GitHub

By clicking “Sign up for GitHub”, you agree to our terms of service and privacy statement. We’ll occasionally send you account related emails.

Already on GitHub? Sign in to your account

Merged
merged 1 commit into from
Jul 21, 2023
Merged

Substitute types before checking inlining compatibility. #113802

Changes from all commits
Commits
Show all changes
1 commit
Select commit
File filter

Filter by extension

Filter by extension
Conversations
Failed to load comments.
Loading
Jump to
Jump to file
Failed to load files.
Loading
Diff view
Diff view
15 changes: 14 additions & 1 deletion compiler/rustc_mir_transform/src/inline.rs
View file
Open in desktop
Original file line number Diff line number Diff line change
Expand Up @@ -440,6 +440,10 @@ impl<'tcx> Inliner<'tcx> {
validation: Ok(()),
};

for var_debug_info in callee_body.var_debug_info.iter() {
Copy link
Member

Choose a reason for hiding this comment

The reason will be displayed to describe this comment to others. Learn more.

What's this for?

Copy link
Member

Choose a reason for hiding this comment

The reason will be displayed to describe this comment to others. Learn more.

(answered in: #113802 (comment) )

checker.visit_var_debug_info(var_debug_info);
}

// Traverse the MIR manually so we can account for the effects of inlining on the CFG.
let mut work_list = vec![START_BLOCK];
let mut visited = BitSet::new_empty(callee_body.basic_blocks.len());
Expand Down Expand Up @@ -847,7 +851,16 @@ impl<'tcx> Visitor<'tcx> for CostChecker<'_, 'tcx> {
if let ProjectionElem::Field(f, ty) = elem {
let parent_ty = place_ref.ty(&self.callee_body.local_decls, self.tcx);
let check_equal = |this: &mut Self, f_ty| {
if !util::is_equal_up_to_subtyping(this.tcx, this.param_env, ty, f_ty) {
// Fast path if there is nothing to substitute.
if ty == f_ty {
return;
}
let ty = this.instance.subst_mir(this.tcx, ty::EarlyBinder::bind(&ty));
let f_ty = this.instance.subst_mir(this.tcx, ty::EarlyBinder::bind(&f_ty));
if ty == f_ty {
return;
}
if !util::is_subtype(this.tcx, this.param_env, ty, f_ty) {
Copy link
Member

Choose a reason for hiding this comment

The reason will be displayed to describe this comment to others. Learn more.

Makes sense, but why are we changing this from is_equal_up_to_subtyping? I guess do we only want to check that ty <: f_ty?

Copy link
Member

Choose a reason for hiding this comment

The reason will be displayed to describe this comment to others. Learn more.

(answered in: #113802 (comment) )

Copy link
Member

Choose a reason for hiding this comment

The reason will be displayed to describe this comment to others. Learn more.

Would be good to add a comment pointing to the issue(s), to give some context to this check.

trace!(?ty, ?f_ty);
this.validation = Err("failed to normalize projection type");
return;
Expand Down