Add recursion limit to FFI safety lint #130598
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compiler/rustc_lint/src/types.rs
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| @@ -1658,6 +1670,9 @@ impl<'a, 'tcx> ImproperCTypesVisitor<'a, 'tcx> { | |||
| FfiResult::FfiUnsafe { ty, reason, help } => { | |||
| self.emit_ffi_unsafe_type_lint(ty, sp, reason, help); | |||
| } | |||
| FfiResult::RecursionLimitReached => { | |||
| self.cx.tcx.dcx().emit_err(RecursionLimitReached { ty, span: sp }); | |||
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This shouldn't be a recursion limit error. It should probably be under the same FFI-unsafety warning but with adjusted wording like "couldn't determine if infinitely recursive type is FFI safe"
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I wasn't myself sure whether to go with the warning or the error. Let me change it to a warning then.
Fixes stack overflow in the case of recursive types
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It's not totally correct that the type is infinitely recursive; it might just be very large. But whatever, I think having a wrong error message is better than a stack overflow. @bors r+ rollup |
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…iaskrgr Rollup of 6 pull requests Successful merges: - rust-lang#129718 (add guarantee about remove_dir and remove_file error kinds) - rust-lang#130598 (Add recursion limit to FFI safety lint) - rust-lang#130642 (Pass the current cargo to `run-make` tests) - rust-lang#130644 (Only expect valtree consts in codegen) - rust-lang#130645 (Normalize consts in writeback when GCE is enabled) - rust-lang#130646 (compiler: factor out `OVERFLOWING_LITERALS` impl) r? `@ghost` `@rustbot` modify labels: rollup
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Rollup merge of rust-lang#130598 - gurry:130310-improper-types-stack-overflow, r=compiler-errors Add recursion limit to FFI safety lint Fixes rust-lang#130310 Now we check against `tcx.recursion_limit()` and raise an error if it the limit is reached instead of overflowing the stack.
| }; | ||
| } | ||
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| acc.recursion_depth += 1; |
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This was never being decremented.
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…mit, r=jieyouxu Revert "Add recursion limit to FFI safety lint" It's not necessarily clear if warning when we hit the recursion limit is the right thing to do, first of all. **More importantly**, this PR was implemented incorrectly in the first place; it was not decrementing the recursion limit when stepping out of a type, so it would trigger when a ctype has more than RECURSION_LIMIT fields *anywhere* in the type's set of recursively reachable fields. Reverts rust-lang#130598 Reopens rust-lang#130310 Fixes rust-lang#130757
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…mit, r=jieyouxu Revert "Add recursion limit to FFI safety lint" It's not necessarily clear if warning when we hit the recursion limit is the right thing to do, first of all. **More importantly**, this PR was implemented incorrectly in the first place; it was not decrementing the recursion limit when stepping out of a type, so it would trigger when a ctype has more than RECURSION_LIMIT fields *anywhere* in the type's set of recursively reachable fields. Reverts rust-lang#130598 Reopens rust-lang#130310 Fixes rust-lang#130757
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Rollup merge of rust-lang#130758 - compiler-errors:ctype-recursion-limit, r=jieyouxu Revert "Add recursion limit to FFI safety lint" It's not necessarily clear if warning when we hit the recursion limit is the right thing to do, first of all. **More importantly**, this PR was implemented incorrectly in the first place; it was not decrementing the recursion limit when stepping out of a type, so it would trigger when a ctype has more than RECURSION_LIMIT fields *anywhere* in the type's set of recursively reachable fields. Reverts rust-lang#130598 Reopens rust-lang#130310 Fixes rust-lang#130757
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Fixes #130310
Now we check against
tcx.recursion_limit()and raise an error if it the limit is reached instead of overflowing the stack.