Rust: Make Element.toString non-recursive
#19162
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- misc/codegen/templates/ql_class.mustache: Language not supported
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- rust/ql/lib/codeql/rust/elements/internal/ElementImpl.qll: Language not supported
- rust/ql/lib/codeql/rust/elements/internal/ModuleImpl.qll: Language not supported
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paldepind
approved these changes
Apr 1, 2025
| final string toString() { | ||
| result = this.toStringImpl() and | ||
| // recursion guard to prevent `toString` from being defined recursively | ||
| (exists(any(Element e).toStringImpl()) implies any()) |
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Why do we have a negated term that uses toStringImpl and not one that uses toString?
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Because that would be non-monotonic recursion :-) So the above prevents cases where toStringImpl calls toString.
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Thanks! Now I get it. We want to prevent toStringImpl from depending on toString and that's why we put toStringImpl there.
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This PR makes
Element.toStringnon-recursive again, and inserts a recursion guard that prevents unintented recursion throughToString(recursion is still possible, but has to go explicitly viaToStringImpl, as is the case in Swift).