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Start block is not allowed to have basic block predecessors

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This commit is contained in:
Tomasz Miąsko 2021-09-14 00:00:00 +00:00
parent 8e398f5ba7
commit 5118dd5a2f
1 changed files with 4 additions and 1 deletions
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5
compiler/rustc_const_eval/src/transform/validate.rs
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@ -9,7 +9,7 @@ use rustc_middle::mir::visit::{PlaceContext, Visitor};
use rustc_middle::mir::{
AggregateKind, BasicBlock, Body, BorrowKind, Local, Location, MirPhase, Operand, PlaceElem,
PlaceRef, ProjectionElem, Rvalue, SourceScope, Statement, StatementKind, Terminator,
TerminatorKind,
TerminatorKind, START_BLOCK,
};
use rustc_middle::ty::fold::BottomUpFolder;
use rustc_middle::ty::{self, ParamEnv, Ty, TyCtxt, TypeFoldable};
@ -130,6 +130,9 @@ impl<'a, 'tcx> TypeChecker<'a, 'tcx> {
}
fn check_edge(&self, location: Location, bb: BasicBlock, edge_kind: EdgeKind) {
if bb == START_BLOCK {
self.fail(location, "start block must not have predecessors")
}
if let Some(bb) = self.body.basic_blocks().get(bb) {
let src = self.body.basic_blocks().get(location.block).unwrap();
match (src.is_cleanup, bb.is_cleanup, edge_kind) {