1087042e22
Similar to the existing nullpointer and alignment checks, this checks
for valid enum discriminants on creation of enums through unsafe
transmutes. Essentially this sanitizes patterns like the following:
```rust
let val: MyEnum = unsafe { std::mem::transmute<u32, MyEnum>(42) };
```
An extension of this check will be done in a follow-up that explicitly
sanitizes for extern enum values that come into Rust from e.g. C/C++.
This check is similar to Miri's capabilities of checking for valid
construction of enum values.
This PR is inspired by saethlin@'s PR
https://github.com/rust-lang/rust/pull/104862. Thank you so much for
keeping this code up and the detailed comments!
I also pair-programmed large parts of this together with vabr-g@.
22 lines
427 B
Rust
22 lines
427 B
Rust
//@ run-pass
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//@ compile-flags: -C debug-assertions
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#[allow(dead_code)]
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enum Foo {
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A,
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B,
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}
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#[allow(dead_code)]
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struct Bar {
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a: usize,
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b: usize,
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}
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fn main() {
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let _val: Option<(usize, Foo)> =
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unsafe { std::mem::transmute::<_, Option<(usize, Foo)>>(Bar { a: 0, b: 0 }) };
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let _val: Option<(usize, Foo)> =
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unsafe { std::mem::transmute::<_, Option<(usize, Foo)>>(Bar { a: 1, b: 0 }) };
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}
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