eea329b0f7
So far the DWARF information for enums was different for regular enums, univariant enums, Option-like enums, etc. Regular enums were encoded as unions of structs, while the other variants were encoded as bare structs. With the changes in this PR all enums are encoded as unions so that debuggers can reconstruct if something originally was a struct, a univariant enum, or an Option-like enum. For the latter case, information about the Null variant is encoded into the union field name. This information can then be used by the debugger to print a None value actually as None instead of Some(0x0).
66 lines
2.2 KiB
Rust
66 lines
2.2 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 *the_a
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// gdb-check:$1 = {{TheA, x = 0, y = 8970181431921507452}, {TheA, 0, 2088533116, 2088533116}}
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// gdb-command:print *the_b
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// gdb-check:$2 = {{TheB, x = 0, y = 1229782938247303441}, {TheB, 0, 286331153, 286331153}}
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// gdb-command:print *univariant
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// gdb-check:$3 = {{123234}}
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#![allow(unused_variable)]
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#![feature(struct_variant)]
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// The first element is to ensure proper alignment, irrespective of the machines word size. Since
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// the size of the discriminant value is machine dependent, this has be taken into account when
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// datatype layout should be predictable as in this case.
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enum ABC {
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TheA { x: i64, y: i64 },
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TheB (i64, i32, i32),
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}
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// This is a special case since it does not have the implicit discriminant field.
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enum Univariant {
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TheOnlyCase(i64)
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}
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fn main() {
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// In order to avoid endianess trouble all of the following test values consist of a single
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// repeated byte. This way each interpretation of the union should look the same, no matter if
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// this is a big or little endian machine.
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// 0b0111110001111100011111000111110001111100011111000111110001111100 = 8970181431921507452
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// 0b01111100011111000111110001111100 = 2088533116
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// 0b0111110001111100 = 31868
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// 0b01111100 = 124
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let the_a = box TheA { x: 0, y: 8970181431921507452 };
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// 0b0001000100010001000100010001000100010001000100010001000100010001 = 1229782938247303441
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// 0b00010001000100010001000100010001 = 286331153
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// 0b0001000100010001 = 4369
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// 0b00010001 = 17
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let the_b = box TheB (0, 286331153, 286331153);
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let univariant = box TheOnlyCase(123234);
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zzz();
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}
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fn zzz() {()}
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