rust/src/test/debug-info/option-like-enum.rs

92 lines
2.3 KiB
Rust
Raw Normal View History

// Copyright 2013 The Rust Project Developers. See the COPYRIGHT
// file at the top-level directory of this distribution and at
// http://rust-lang.org/COPYRIGHT.
//
// Licensed under the Apache License, Version 2.0 <LICENSE-APACHE or
// http://www.apache.org/licenses/LICENSE-2.0> or the MIT license
// <LICENSE-MIT or http://opensource.org/licenses/MIT>, at your
// option. This file may not be copied, modified, or distributed
// except according to those terms.
// xfail-android
// compile-flags:-Z extra-debug-info
// debugger:rbreak zzz
// debugger:run
// debugger:finish
// debugger:print some
// check:$1 = {0x12345678}
// debugger:print none
// check:$2 = {0x0}
// debugger:print full
// check:$3 = {454545, 0x87654321, 9988}
// debugger:print empty->discr
// check:$4 = (int *) 0x0
// debugger:print droid
// check:$5 = {id = 675675, range = 10000001, internals = 0x43218765}
// debugger:print void_droid->internals
// check:$6 = (int *) 0x0
// debugger:continue
#[feature(struct_variant)];
// If a struct has exactly two variants, one of them is empty, and the other one
// contains a non-nullable pointer, then this value is used as the discriminator.
// The test cases in this file make sure that something readable is generated for
// this kind of types.
// Unfortunately (for these test cases) the content of the non-discriminant fields
// in the null-case is not defined. So we just read the discriminator field in
// this case (by casting the value to a memory-equivalent struct).
enum MoreFields<'self> {
Full(u32, &'self int, i16),
Empty
}
struct MoreFieldsRepr<'self> {
a: u32,
discr: &'self int,
b: i16
}
enum NamedFields<'self> {
Droid { id: i32, range: i64, internals: &'self int },
Void
}
struct NamedFieldsRepr<'self> {
id: i32,
range: i64,
internals: &'self int
}
fn main() {
let some: Option<&u32> = Some(unsafe { std::cast::transmute(0x12345678) });
let none: Option<&u32> = None;
let full = Full(454545, unsafe { std::cast::transmute(0x87654321) }, 9988);
let int_val = 0;
let empty: &MoreFieldsRepr = unsafe { std::cast::transmute(&Empty) };
let droid = Droid {
id: 675675,
range: 10000001,
internals: unsafe { std::cast::transmute(0x43218765) }
};
let void_droid: &NamedFieldsRepr = unsafe { std::cast::transmute(&Void) };
zzz();
}
fn zzz() {()}