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Description
cargo test under tests\expectations fails today when building bitfield_align_2.rs.
Error message:
C:\Users\andre\Projects\rust-bindgen\tests\expectations [master ≡]> cargo test
Compiling tests_expectations v0.1.0 (file:///C:/Users/andre/Projects/rust-bindgen/tests/expectations)
error[E0512]: transmute called with differently sized types: u64 (64 bits) to i32 (32 bits)
--> tests\bitfield_align_2.rs:93:18
|
93 | unsafe { ::std::mem::transmute(val as u64) }
| ^^^^^^^^^^^^^^^^^^^^^ transmuting between 64 bits and 32 bits
error: aborting due to previous error(s)
error: Could not compile `tests_expectations`.
Build failed, waiting for other jobs to finish...
error: build failed
This is the function being built:
#[inline]
pub fn ptr(&self) -> ::std::os::raw::c_long {
let mut unit_field_val: u64 = unsafe { ::std::mem::uninitialized() };
unsafe {
::std::ptr::copy_nonoverlapping(
&self._bitfield_1 as *const _ as *const u8,
&mut unit_field_val as *mut u64 as *mut u8,
::std::mem::size_of::<u64>(),
)
};
let mask = 18446744073709551612u64 as u64;
let val = (unit_field_val & mask) >> 2usize;
unsafe { ::std::mem::transmute(val as u64) }
}
The problem is that on Windows c_long is 32-bits, whereas on all other platforms (as defined by Rust), it is 64-bits. We need to somehow change the as operator to narrow the type to the size of the platform representation of the type.
The file being translated is bitfield_align_2.h
// bindgen-flags: --rustified-enum .*
enum MyEnum {
ONE,
TWO,
THREE,
FOUR
};
struct TaggedPtr {
enum MyEnum tag : 2;
long ptr : 62;
};