gdb/testsuite/gdb.rust/simple.rs

   1 // Copyright (C) 2016-2023 Free Software Foundation, Inc.
   2
   3 // This program is free software; you can redistribute it and/or modify
   4 // it under the terms of the GNU General Public License as published by
   5 // the Free Software Foundation; either version 3 of the License, or
   6 // (at your option) any later version.
   7 //
   8 // This program is distributed in the hope that it will be useful,
   9 // but WITHOUT ANY WARRANTY; without even the implied warranty of
  10 // MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  11 // GNU General Public License for more details.
  12 //
  13 // You should have received a copy of the GNU General Public License
  14 // along with this program.  If not, see <http://www.gnu.org/licenses/>.
  15
  16 #![allow(dead_code)]
  17 #![allow(unused_variables)]
  18 #![allow(unused_assignments)]
  19
  20
  21 pub struct HiBob {
  22     pub field1: i32,
  23     field2: u64,
  24 }
  25
  26 struct ByeBob(i32, u64);
  27
  28 enum Something {
  29     One,
  30     Two,
  31     Three
  32 }
  33
  34 enum MoreComplicated {
  35     One,
  36     Two(i32),
  37     Three(HiBob),
  38     Four{this: bool, is: u8, a: char, struct_: u64, variant: u32},
  39 }
  40
  41 // tests the nonzero optimization, but fields are reversed
  42 enum NonZeroOptimized {
  43     Empty,
  44     Value(String),
  45 }
  46
  47 fn diff2(x: i32, y: i32) -> i32 {
  48     x - y
  49 }
  50
  51 // Empty function, should not have "void"
  52 // or "()" in its return type
  53 fn empty() {
  54
  55 }
  56
  57 pub struct Unit;
  58
  59 // This triggers the non-zero optimization that yields a different
  60 // enum representation in the debug info.
  61 enum SpaceSaver {
  62     Thebox(u8, Box<i32>),
  63     Nothing,
  64 }
  65
  66 enum Univariant {
  67     Foo {a: u8}
  68 }
  69 enum UnivariantAnon {
  70     Foo(u8)
  71 }
  72
  73 enum ParametrizedEnum<T> {
  74     Val { val: T },
  75     Empty,
  76 }
  77
  78 struct ParametrizedStruct<T> {
  79     next: ParametrizedEnum<Box<ParametrizedStruct<T>>>,
  80     value: T
  81 }
  82
  83 struct StringAtOffset {
  84     pub field1: &'static str,
  85     pub field2: i32,
  86     pub field3: &'static str,
  87 }
  88
  89 // A simple structure whose layout won't be changed by the compiler,
  90 // so that ptype/o testing will work on any platform.
  91 struct SimpleLayout {
  92     f1: u16,
  93     f2: u16
  94 }
  95
  96 enum EmptyEnum {}
  97
  98 #[derive(Debug)]
  99 struct EnumWithNonzeroOffset {
 100     a: Option<u8>,
 101     b: Option<u8>,
 102 }
 103
 104 fn main () {
 105     let a = ();
 106     let b : [i32; 0] = [];
 107
 108     let mut c = 27;
 109     let d = c = 99;
 110
 111     let e = MoreComplicated::Two(73);
 112     let e2 = MoreComplicated::Four {this: true, is: 8, a: 'm',
 113                                     struct_: 100, variant: 10};
 114
 115     let f = "hi bob";
 116     let g = b"hi bob";
 117     let h = b'9';
 118
 119     let fslice = &f[3..];
 120
 121     let i = ["whatever"; 8];
 122
 123     let j = Unit;
 124     let j2 = Unit{};
 125
 126     let k = SpaceSaver::Nothing;
 127     let l = SpaceSaver::Thebox(9, Box::new(1729));
 128
 129     let v = Something::Three;
 130     let w = [1,2,3,4];
 131     let w_ptr = &w[0];
 132     let x = (23, 25.5);
 133     let y = HiBob {field1: 7, field2: 8};
 134     let z = ByeBob(7, 8);
 135
 136     let field1 = 77;
 137     let field2 = 88;
 138
 139     let univariant = Univariant::Foo {a : 1};
 140     let univariant_anon = UnivariantAnon::Foo(1);
 141
 142     let slice = &w[2..3];
 143     let fromslice = slice[0];
 144     let slice2 = &slice[0..1];
 145
 146     let all1 = &w[..];
 147     let all2 = &slice[..];
 148
 149     let from1 = &w[1..];
 150     let from2 = &slice[1..];
 151
 152     let to1 = &w[..3];
 153     let to2 = &slice[..1];
 154
 155     let st = StringAtOffset { field1: "hello", field2: 1, field3: "world" };
 156
 157     // tests for enum optimizations
 158
 159     let str_some = Some("hi".to_string());
 160     let str_none = None::<String>;
 161     let box_some = Some(Box::new(1u8));
 162     let box_none = None::<Box<u8>>;
 163     let int_some = Some(1u8);
 164     let int_none = None::<u8>;
 165     let custom_some = NonZeroOptimized::Value("hi".into());
 166     let custom_none = NonZeroOptimized::Empty;
 167
 168     let parametrized = ParametrizedStruct {
 169         next: ParametrizedEnum::Val {
 170             val: Box::new(ParametrizedStruct {
 171                 next: ParametrizedEnum::Empty,
 172                 value: 1,
 173             })
 174         },
 175         value: 0,
 176     };
 177
 178     let simplelayout = SimpleLayout { f1: 8, f2: 9 };
 179
 180     let empty_enum_value: EmptyEnum;
 181
 182     let nonzero_offset = EnumWithNonzeroOffset { a: Some(1), b: None };
 183
 184     println!("{}, {}", x.0, x.1);        // set breakpoint here
 185     println!("{}", diff2(92, 45));
 186     empty();
 187 }