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c295e0f8 XL |
1 | // Compiler: |
2 | // | |
3 | // Run-time: | |
4 | // status: 0 | |
5 | // stdout: 42 | |
6 | // 7 | |
7 | // 5 | |
8 | // 10 | |
9 | ||
10 | #![feature(arbitrary_self_types, auto_traits, lang_items, no_core, start, intrinsics)] | |
11 | ||
12 | #![no_std] | |
13 | #![no_core] | |
14 | ||
15 | /* | |
16 | * Core | |
17 | */ | |
18 | ||
19 | // Because we don't have core yet. | |
20 | #[lang = "sized"] | |
21 | pub trait Sized {} | |
22 | ||
23 | #[lang = "copy"] | |
24 | trait Copy { | |
25 | } | |
26 | ||
27 | impl Copy for isize {} | |
28 | impl Copy for usize {} | |
29 | impl Copy for i32 {} | |
30 | impl Copy for u8 {} | |
31 | impl Copy for i8 {} | |
32 | impl Copy for i16 {} | |
33 | ||
34 | #[lang = "receiver"] | |
35 | trait Receiver { | |
36 | } | |
37 | ||
38 | #[lang = "freeze"] | |
39 | pub(crate) unsafe auto trait Freeze {} | |
40 | ||
41 | mod libc { | |
42 | #[link(name = "c")] | |
43 | extern "C" { | |
44 | pub fn printf(format: *const i8, ...) -> i32; | |
45 | pub fn puts(s: *const u8) -> i32; | |
46 | } | |
47 | } | |
48 | ||
49 | #[lang = "index"] | |
50 | pub trait Index<Idx: ?Sized> { | |
51 | type Output: ?Sized; | |
52 | fn index(&self, index: Idx) -> &Self::Output; | |
53 | } | |
54 | ||
55 | impl<T> Index<usize> for [T; 3] { | |
56 | type Output = T; | |
57 | ||
58 | fn index(&self, index: usize) -> &Self::Output { | |
59 | &self[index] | |
60 | } | |
61 | } | |
62 | ||
63 | impl<T> Index<usize> for [T] { | |
64 | type Output = T; | |
65 | ||
66 | fn index(&self, index: usize) -> &Self::Output { | |
67 | &self[index] | |
68 | } | |
69 | } | |
70 | ||
71 | #[lang = "drop_in_place"] | |
72 | #[allow(unconditional_recursion)] | |
73 | pub unsafe fn drop_in_place<T: ?Sized>(to_drop: *mut T) { | |
74 | // Code here does not matter - this is replaced by the | |
75 | // real drop glue by the compiler. | |
76 | drop_in_place(to_drop); | |
77 | } | |
78 | ||
79 | #[lang = "panic"] | |
80 | #[track_caller] | |
81 | #[no_mangle] | |
82 | pub fn panic(_msg: &str) -> ! { | |
83 | unsafe { | |
84 | libc::puts("Panicking\0" as *const str as *const u8); | |
85 | intrinsics::abort(); | |
86 | } | |
87 | } | |
88 | ||
89 | #[lang = "panic_location"] | |
90 | struct PanicLocation { | |
91 | file: &'static str, | |
92 | line: u32, | |
93 | column: u32, | |
94 | } | |
95 | ||
96 | #[lang = "panic_bounds_check"] | |
97 | #[track_caller] | |
98 | #[no_mangle] | |
99 | fn panic_bounds_check(index: usize, len: usize) -> ! { | |
100 | unsafe { | |
101 | libc::printf("index out of bounds: the len is %d but the index is %d\n\0" as *const str as *const i8, len, index); | |
102 | intrinsics::abort(); | |
103 | } | |
104 | } | |
105 | ||
106 | mod intrinsics { | |
107 | extern "rust-intrinsic" { | |
108 | pub fn abort() -> !; | |
109 | } | |
110 | } | |
111 | ||
112 | #[lang = "add"] | |
113 | trait Add<RHS = Self> { | |
114 | type Output; | |
115 | ||
116 | fn add(self, rhs: RHS) -> Self::Output; | |
117 | } | |
118 | ||
119 | impl Add for u8 { | |
120 | type Output = Self; | |
121 | ||
122 | fn add(self, rhs: Self) -> Self { | |
123 | self + rhs | |
124 | } | |
125 | } | |
126 | ||
127 | impl Add for i8 { | |
128 | type Output = Self; | |
129 | ||
130 | fn add(self, rhs: Self) -> Self { | |
131 | self + rhs | |
132 | } | |
133 | } | |
134 | ||
135 | impl Add for i32 { | |
136 | type Output = Self; | |
137 | ||
138 | fn add(self, rhs: Self) -> Self { | |
139 | self + rhs | |
140 | } | |
141 | } | |
142 | ||
143 | impl Add for usize { | |
144 | type Output = Self; | |
145 | ||
146 | fn add(self, rhs: Self) -> Self { | |
147 | self + rhs | |
148 | } | |
149 | } | |
150 | ||
151 | impl Add for isize { | |
152 | type Output = Self; | |
153 | ||
154 | fn add(self, rhs: Self) -> Self { | |
155 | self + rhs | |
156 | } | |
157 | } | |
158 | ||
159 | #[lang = "sub"] | |
160 | pub trait Sub<RHS = Self> { | |
161 | type Output; | |
162 | ||
163 | fn sub(self, rhs: RHS) -> Self::Output; | |
164 | } | |
165 | ||
166 | impl Sub for usize { | |
167 | type Output = Self; | |
168 | ||
169 | fn sub(self, rhs: Self) -> Self { | |
170 | self - rhs | |
171 | } | |
172 | } | |
173 | ||
174 | impl Sub for isize { | |
175 | type Output = Self; | |
176 | ||
177 | fn sub(self, rhs: Self) -> Self { | |
178 | self - rhs | |
179 | } | |
180 | } | |
181 | ||
182 | impl Sub for u8 { | |
183 | type Output = Self; | |
184 | ||
185 | fn sub(self, rhs: Self) -> Self { | |
186 | self - rhs | |
187 | } | |
188 | } | |
189 | ||
190 | impl Sub for i8 { | |
191 | type Output = Self; | |
192 | ||
193 | fn sub(self, rhs: Self) -> Self { | |
194 | self - rhs | |
195 | } | |
196 | } | |
197 | ||
198 | impl Sub for i16 { | |
199 | type Output = Self; | |
200 | ||
201 | fn sub(self, rhs: Self) -> Self { | |
202 | self - rhs | |
203 | } | |
204 | } | |
205 | ||
206 | ||
207 | /* | |
208 | * Code | |
209 | */ | |
210 | ||
211 | static mut ONE: usize = 1; | |
212 | ||
213 | fn make_array() -> [u8; 3] { | |
214 | [42, 10, 5] | |
215 | } | |
216 | ||
217 | #[start] | |
218 | fn main(argc: isize, _argv: *const *const u8) -> isize { | |
219 | let array = [42, 7, 5]; | |
220 | let array2 = make_array(); | |
221 | unsafe { | |
222 | libc::printf(b"%ld\n\0" as *const u8 as *const i8, array[ONE - 1]); | |
223 | libc::printf(b"%ld\n\0" as *const u8 as *const i8, array[ONE]); | |
224 | libc::printf(b"%ld\n\0" as *const u8 as *const i8, array[ONE + 1]); | |
225 | ||
226 | libc::printf(b"%d\n\0" as *const u8 as *const i8, array2[argc as usize] as u32); | |
227 | } | |
228 | 0 | |
229 | } |