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authorUlrich Weigand <ulrich.weigand@de.ibm.com>2022-12-19 21:24:09 +0100
committerUlrich Weigand <ulrich.weigand@de.ibm.com>2022-12-19 21:24:09 +0100
commit6bb2bda23eb0ced0375ebd119454f8e95dc36db8 (patch)
tree065debed63095b384329af8030eb28c601fd24ff /tests/rustdoc-js-std/parser-errors.js
parent4653c93e4442d88bf3278067183c8fdc0be74a1f (diff)
downloadrust-6bb2bda23eb0ced0375ebd119454f8e95dc36db8.tar.gz
Fix stack overflow in recursive AST walk in early lint
The src/test/ui/issues/issue-74564-if-expr-stack-overflow.rs test case added to verify https://github.com/rust-lang/rust/issues/74564 still crashes with a stack overflow on s390x-ibm-linux. Symptom is a very deep recursion in compiler/rustc_lint/src/early.rs: fn visit_expr(&mut self, e: &'a ast::Expr) { self.with_lint_attrs(e.id, &e.attrs, |cx| { lint_callback!(cx, check_expr, e); ast_visit::walk_expr(cx, e); }) } (where walk_expr recursively calls back into visit_expr). The crash happens at a nesting depth of over 17000 stack frames when using the default 8 MB stack size on s390x. This patch fixes the problem by adding a ensure_sufficient_stack call to the with_lint_attrs routine (which also should take care of all the other mutually recursive visitors here). Fixes part of https://github.com/rust-lang/rust/issues/105383.
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