94 lines
2.5 KiB
Rust
94 lines
2.5 KiB
Rust
// Copyright 2013-2014 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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// ignore-android: FIXME(#10381)
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// compile-flags:-g
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// gdb-command:rbreak zzz
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// gdb-command:run
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// gdb-command:finish
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// gdb-command:print some
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// gdb-check:$1 = (u32 *) 0x12345678
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// gdb-command:print none
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// gdb-check:$2 = (u32 *) 0x0
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// gdb-command:print full
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// gdb-check:$3 = {454545, 0x87654321, 9988}
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// gdb-command:print empty->discr
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// gdb-check:$4 = (int *) 0x0
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// gdb-command:print droid
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// gdb-check:$5 = {id = 675675, range = 10000001, internals = 0x43218765}
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// gdb-command:print void_droid->internals
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// gdb-check:$6 = (int *) 0x0
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// gdb-command:continue
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#![feature(struct_variant)]
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// If a struct has exactly two variants, one of them is empty, and the other one
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// contains a non-nullable pointer, then this value is used as the discriminator.
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// The test cases in this file make sure that something readable is generated for
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// this kind of types.
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// If the non-empty variant contains a single non-nullable pointer than the whole
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// item is represented as just a pointer and not wrapped in a struct.
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// Unfortunately (for these test cases) the content of the non-discriminant fields
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// in the null-case is not defined. So we just read the discriminator field in
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// this case (by casting the value to a memory-equivalent struct).
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enum MoreFields<'a> {
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Full(u32, &'a int, i16),
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Empty
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}
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struct MoreFieldsRepr<'a> {
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a: u32,
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discr: &'a int,
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b: i16
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}
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enum NamedFields<'a> {
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Droid { id: i32, range: i64, internals: &'a int },
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Void
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}
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struct NamedFieldsRepr<'a> {
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id: i32,
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range: i64,
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internals: &'a int
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}
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fn main() {
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let some: Option<&u32> = Some(unsafe { std::mem::transmute(0x12345678) });
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let none: Option<&u32> = None;
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let full = Full(454545, unsafe { std::mem::transmute(0x87654321) }, 9988);
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let int_val = 0;
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let empty: &MoreFieldsRepr = unsafe { std::mem::transmute(&Empty) };
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let droid = Droid {
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id: 675675,
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range: 10000001,
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internals: unsafe { std::mem::transmute(0x43218765) }
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};
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let void_droid: &NamedFieldsRepr = unsafe { std::mem::transmute(&Void) };
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zzz();
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}
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fn zzz() {()}
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