36 lines
1.3 KiB
Rust
36 lines
1.3 KiB
Rust
// Copyright 2014 The Rust Project Developers. See the COPYRIGHT
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// file at the top-level directory of this distribution and at
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// http://rust-lang.org/COPYRIGHT.
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//
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// Licensed under the Apache License, Version 2.0 <LICENSE-APACHE or
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// http://www.apache.org/licenses/LICENSE-2.0> or the MIT license
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// <LICENSE-MIT or http://opensource.org/licenses/MIT>, at your
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// option. This file may not be copied, modified, or distributed
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// except according to those terms.
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// #11303, #11040:
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// This would previously crash on i686 Linux due to abi differences
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// between returning an Option<T> and T, where T is a non nullable
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// pointer.
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// If we have an enum with two variants such that one is zero sized
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// and the other contains a nonnullable pointer, we don't use a
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// separate discriminant. Instead we use that pointer field to differentiate
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// between the 2 cases.
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// Also, if the variant with the nonnullable pointer has no other fields
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// then we simply express the enum as just a pointer and not wrap it
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// in a struct.
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use std::mem;
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#[inline(never)]
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extern "C" fn foo<'a>(x: &'a int) -> Option<&'a int> { Some(x) }
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static FOO: int = 0xDEADBEE;
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pub fn main() {
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unsafe {
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let f: for<'a> extern "C" fn(&'a int) -> &'a int = mem::transmute(foo);
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assert_eq!(*f(&FOO), FOO);
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}
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}
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