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Replace visitor with a loop over blocks and statements

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This commit is contained in:
Tomasz Miąsko 2022-12-17 00:00:00 +00:00
parent aef17b7ae6
commit 2a8513d221
1 changed files with 13 additions and 26 deletions
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39
compiler/rustc_mir_transform/src/cleanup_post_borrowck.rs
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@ -19,21 +19,24 @@
//! [`Nop`]: rustc_middle::mir::StatementKind::Nop
use crate::MirPass;
use rustc_middle::mir::visit::MutVisitor;
use rustc_middle::mir::{Body, BorrowKind, Location, Rvalue};
use rustc_middle::mir::{Statement, StatementKind};
use rustc_middle::mir::{Body, BorrowKind, Rvalue, StatementKind};
use rustc_middle::ty::TyCtxt;
pub struct CleanupNonCodegenStatements;
pub struct DeleteNonCodegenStatements<'tcx> {
tcx: TyCtxt<'tcx>,
}
impl<'tcx> MirPass<'tcx> for CleanupNonCodegenStatements {
fn run_pass(&self, tcx: TyCtxt<'tcx>, body: &mut Body<'tcx>) {
let mut delete = DeleteNonCodegenStatements { tcx };
delete.visit_body_preserves_cfg(body);
fn run_pass(&self, _tcx: TyCtxt<'tcx>, body: &mut Body<'tcx>) {
for basic_block in body.basic_blocks.as_mut_preserves_cfg() {
for statement in basic_block.statements.iter_mut() {
match statement.kind {
StatementKind::AscribeUserType(..)
| StatementKind::Assign(box (_, Rvalue::Ref(_, BorrowKind::Shallow, _)))
| StatementKind::FakeRead(..) => statement.make_nop(),
_ => (),
}
}
}
body.user_type_annotations.raw.clear();
for decl in &mut body.local_decls {
@ -41,19 +44,3 @@ impl<'tcx> MirPass<'tcx> for CleanupNonCodegenStatements {
}
}
}
impl<'tcx> MutVisitor<'tcx> for DeleteNonCodegenStatements<'tcx> {
fn tcx(&self) -> TyCtxt<'tcx> {
self.tcx
}
fn visit_statement(&mut self, statement: &mut Statement<'tcx>, location: Location) {
match statement.kind {
StatementKind::AscribeUserType(..)
| StatementKind::Assign(box (_, Rvalue::Ref(_, BorrowKind::Shallow, _)))
| StatementKind::FakeRead(..) => statement.make_nop(),
_ => (),
}
self.super_statement(statement, location);
}
}