24 lines
892 B
Rust
24 lines
892 B
Rust
// `PrimVal`s in Miri are represented with 8 bytes (u64) and at the time of writing, the `-x`
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// will sign extend into the entire 8 bytes. Then, if you tried to write the `-x` into
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// something smaller than 8 bytes, like a 4 byte pointer, it would crash in byteorder crate
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// code that assumed only the low 4 bytes would be set. Actually, we were masking properly for
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// everything except pointers before I fixed it, so this was probably impossible to reproduce on
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// 64-bit.
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//
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// This is just intended as a regression test to make sure we don't reintroduce this problem.
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#[cfg(target_pointer_width = "32")]
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fn main() {
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use std::mem::transmute;
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// Make the weird PrimVal.
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let x = 1i32;
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let bad = unsafe { transmute::<i32, *const u8>(-x) };
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// Force it through the Memory::write_primval code.
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Box::new(bad);
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}
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#[cfg(not(target_pointer_width = "32"))]
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fn main() {}
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