handle diverging functions forwarding their return place #66827
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| // (even a ZST read/write) needs to error, so let us make this | ||
| // a NULL place. | ||
| // | ||
| // FIXME: Ideally we'd make sure that the place projections also |
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Like just doing a place projection on a null place should error?
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Place projections should have inbounds rules, basically. We have an implementation of that in Miri, and these days I am actually not ashamed of it any more. ;)
But I am worried about the perf impact of this and I think it is currently actually impossible to violate the inbounds requirement, so I didn't bother working on moving that into the core engine.
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@bors r+ |
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📌 Commit 2869aba has been approved by |
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⌛ Testing commit 2869aba with merge d703ed834af1ea4b1c38e85e7dc220786f876865... |
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💔 Test failed - checks-azure |
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Chocolatey was down. @bors retry |
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⌛ Testing commit 2869aba with merge 1041db3d91d3f1be462da9124ae0b1b7e16d5a14... |
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💔 Test failed - checks-azure |
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@bors retry spurious |
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Centril
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…oli-obk handle diverging functions forwarding their return place Fixes rust-lang/miri#1075: the shim around diverging closures turned into function pointers actually "obtains" a return place inside a diverging function, but just uses it as the return place for a diverging callee. Handle this by using NULL places. This is kind of a hack as it breaks our invariant that all places are dereferencable, but we'd eventually let raw pointers break that anyway I assume so that seems fine. r? @oli-obk
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Rollup of 7 pull requests Successful merges: - #66346 (Replace .unwrap() with ? in std::os::unix::net) - #66789 (rustc: move mir::SourceScopeLocalData to a field of SourceScopeData.) - #66822 (libunwind_panic: adjust miri panic hack) - #66827 (handle diverging functions forwarding their return place) - #66828 (Less minification) - #66850 (rustc: hide HirId's fmt::Debug output from -Z span_free_formats.) - #66907 (rustc: don't just show raw DefIndex's in BrNamed's fmt::Debug impl.) Failed merges: - #66874 (Miri engine: proper support for `Assert` MIR terminators) r? @ghost
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Rollup of 7 pull requests Successful merges: - #66346 (Replace .unwrap() with ? in std::os::unix::net) - #66789 (rustc: move mir::SourceScopeLocalData to a field of SourceScopeData.) - #66822 (libunwind_panic: adjust miri panic hack) - #66827 (handle diverging functions forwarding their return place) - #66828 (Less minification) - #66850 (rustc: hide HirId's fmt::Debug output from -Z span_free_formats.) - #66907 (rustc: don't just show raw DefIndex's in BrNamed's fmt::Debug impl.) Failed merges: - #66874 (Miri engine: proper support for `Assert` MIR terminators) r? @ghost
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…oli-obk handle diverging functions forwarding their return place Fixes rust-lang/miri#1075: the shim around diverging closures turned into function pointers actually "obtains" a return place inside a diverging function, but just uses it as the return place for a diverging callee. Handle this by using NULL places. This is kind of a hack as it breaks our invariant that all places are dereferencable, but we'd eventually let raw pointers break that anyway I assume so that seems fine. r? @oli-obk
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…oli-obk handle diverging functions forwarding their return place Fixes rust-lang/miri#1075: the shim around diverging closures turned into function pointers actually "obtains" a return place inside a diverging function, but just uses it as the return place for a diverging callee. Handle this by using NULL places. This is kind of a hack as it breaks our invariant that all places are dereferencable, but we'd eventually let raw pointers break that anyway I assume so that seems fine. r? @oli-obk
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…oli-obk handle diverging functions forwarding their return place Fixes rust-lang/miri#1075: the shim around diverging closures turned into function pointers actually "obtains" a return place inside a diverging function, but just uses it as the return place for a diverging callee. Handle this by using NULL places. This is kind of a hack as it breaks our invariant that all places are dereferencable, but we'd eventually let raw pointers break that anyway I assume so that seems fine. r? @oli-obk
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Rollup of 5 pull requests Successful merges: - #66245 (Conditional compilation for sanitizers) - #66654 (Handle const-checks for `&mut` outside of `HasMutInterior`) - #66822 (libunwind_panic: adjust miri panic hack) - #66827 (handle diverging functions forwarding their return place) - #66834 (rustbuild fixes) Failed merges: r? @ghost
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Test diverging closure coercion Adds a test for #1075. Depends on rust-lang/rust#66827.
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Fixes rust-lang/miri#1075: the shim around diverging closures turned into function pointers actually "obtains" a return place inside a diverging function, but just uses it as the return place for a diverging callee. Handle this by using NULL places.
This is kind of a hack as it breaks our invariant that all places are dereferencable, but we'd eventually let raw pointers break that anyway I assume so that seems fine.
r? @oli-obk