ICE assertion left == right failed: write_cvalue_transmute: types::I32 -> types::I64
#1452
Comments
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another one auto-reduced (treereduce-rust): use std::mem;
struct PackedSized {
f: u8,
d: [u32; 4],
}
struct PackedUnsized {
f: u8,
d: [u32],
}
impl PackedSized {
fn unsize(&self) -> &PackedUnsized {
let len = 1;
unsafe { mem::transmute((self, len)) }
}
}
fn main() {
unsafe {
let p = PackedSized {
f: 0,
d: [1, 2, 3, 4],
};
let p = p.unsize() as *const PackedUnsized;
}
}
original: //@ run-pass
#![feature(layout_for_ptr)]
use std::mem;
#[repr(packed, C)]
struct PackedSized {
f: u8,
d: [u32; 4],
}
#[repr(packed, C)]
struct PackedUnsized {
f: u8,
d: [u32],
}
impl PackedSized {
fn unsize(&self) -> &PackedUnsized {
// We can't unsize via a generic type since then we get the error
// that packed structs with unsized tail don't work if the tail
// might need dropping.
let len = 1;
unsafe { mem::transmute((self, len)) }
}
}
fn main() { unsafe {
let p = PackedSized { f: 0, d: [1, 2, 3, 4] };
let p = p.unsize() as *const PackedUnsized;
// Make sure the size computation does *not* think there is
// any padding in front of the `d` field.
assert_eq!(mem::size_of_val_raw(p), 1 + 4*4);
// And likewise for the offset computation.
let d = std::ptr::addr_of!((*p).d);
assert_eq!(d.cast::<u32>().read_unaligned(), 1);
} }Version information Command: Program output
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auto-reduced (treereduce-rust):
original:
Version information
Command:
/home/matthias/.rustup/toolchains/master/bin/rustc -Zmir-opt-level=5 -Zcodegen-backend=craneliftProgram output
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