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37 lines
1 KiB
Rust
37 lines
1 KiB
Rust
/* This Source Code Form is subject to the terms of the Mozilla Public
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* License, v. 2.0. If a copy of the MPL was not distributed with this
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* file, You can obtain one at http://mozilla.org/MPL/2.0/. */
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#![feature(raw)]
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extern crate layout;
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#[macro_use] extern crate size_of_test;
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#[cfg(all(test, target_pointer_width = "64"))] mod size_of;
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use std::mem;
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use std::ptr;
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use std::raw;
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#[test]
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fn test_trait_object_layout() {
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assert_eq!(mem::size_of::<raw::TraitObject>(), mem::size_of::<layout::TraitObject>());
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let null: *mut () = ptr::null_mut();
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let a = raw::TraitObject {
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data: null,
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vtable: null,
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};
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let b = layout::TraitObject {
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data: null,
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vtable: null,
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};
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fn offset<T, U>(struct_: &T, field: &U) -> usize {
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let addr_struct = struct_ as *const T as usize;
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let addr_field = field as *const U as usize;
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addr_field - addr_struct
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}
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assert_eq!(offset(&a, &a.data), offset(&b, &b.data));
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assert_eq!(offset(&a, &a.vtable), offset(&b, &b.vtable));
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}
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