1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
260
261
262
263
264
265
266
267
268
269
270
271
272
273
274
275
276
277
278
279
280
281
282
283
284
285
286
287
288
289
290
291
292
293
294
295
296
297
298
299
300
301
302
303
304
305
306
307
308
309
310
311
312
313
314
315
316
317
318
319
320
321
322
323

use super::*;

/// Marker trait for "plain old data".
///
/// The point of this trait is that once something is marked "plain old data"
/// you can really go to town with the bit fiddling and bit casting. Therefore,
/// it's a relatively strong claim to make about a type. Do not add this to your
/// type casually.
///
/// **Reminder:** The results of casting around bytes between data types are
/// _endian dependant_. Little-endian machines are the most common, but
/// big-endian machines do exist (and big-endian is also used for "network
/// order" bytes).
///
/// ## Safety
///
/// * The type must be inhabited (eg: no
///   [Infallible](core::convert::Infallible)).
/// * The type must allow any bit pattern (eg: no `bool` or `char`, which have
///   illegal bit patterns).
/// * The type must not contain any uninit (or padding) bytes, either in the
///   middle or on the end (eg: no `#[repr(C)] struct Foo(u8, u16)`, which has
///   padding in the middle, and also no `#[repr(C)] struct Foo(u16, u8)`, which
///   has padding on the end).
/// * The type needs to have all fields also be `Pod`.
/// * The type needs to be `repr(C)` or `repr(transparent)`. In the case of
///   `repr(C)`, the `packed` and `align` repr modifiers can be used as long as
///   all other rules end up being followed.
/// * It is disallowed for types to contain pointer types, `Cell`, `UnsafeCell`,
///   atomics, and any other forms of interior mutability.
/// * More precisely: A shared reference to the type must allow reads, and
///   *only* reads. RustBelt's separation logic is based on the notion that a
///   type is allowed to define a sharing predicate, its own invariant that must
///   hold for shared references, and this predicate is the reasoning that allow
///   it to deal with atomic and cells etc. We require the sharing predicate to
///   be trivial and permit only read-only access.
pub unsafe trait Pod: Zeroable + Copy + 'static {}

unsafe impl Pod for () {}
unsafe impl Pod for u8 {}
unsafe impl Pod for i8 {}
unsafe impl Pod for u16 {}
unsafe impl Pod for i16 {}
unsafe impl Pod for u32 {}
unsafe impl Pod for i32 {}
unsafe impl Pod for u64 {}
unsafe impl Pod for i64 {}
unsafe impl Pod for usize {}
unsafe impl Pod for isize {}
unsafe impl Pod for u128 {}
unsafe impl Pod for i128 {}
unsafe impl Pod for f32 {}
unsafe impl Pod for f64 {}
unsafe impl<T: Pod> Pod for Wrapping<T> {}

#[cfg(feature = "unsound_ptr_pod_impl")]
unsafe impl<T: 'static> Pod for *mut T {}
#[cfg(feature = "unsound_ptr_pod_impl")]
unsafe impl<T: 'static> Pod for *const T {}
#[cfg(feature = "unsound_ptr_pod_impl")]
unsafe impl<T: 'static> PodInOption for NonNull<T> {}

unsafe impl<T: Pod> Pod for PhantomData<T> {}
unsafe impl Pod for PhantomPinned {}
unsafe impl<T: Pod> Pod for ManuallyDrop<T> {}

// Note(Lokathor): MaybeUninit can NEVER be Pod.

#[cfg(feature = "min_const_generics")]
unsafe impl<T, const N: usize> Pod for [T; N] where T: Pod {}

#[cfg(not(feature = "min_const_generics"))]
impl_unsafe_marker_for_array!(
  Pod, 0, 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19,
  20, 21, 22, 23, 24, 25, 26, 27, 28, 29, 30, 31, 32, 48, 64, 96, 128, 256,
  512, 1024, 2048, 4096
);

#[cfg(all(target_arch = "wasm32", feature = "wasm_simd"))]
unsafe impl Pod for wasm32::v128 {}

#[cfg(all(target_arch = "aarch64", feature = "aarch64_simd"))]
unsafe impl Pod for aarch64::float32x2_t {}
#[cfg(all(target_arch = "aarch64", feature = "aarch64_simd"))]
unsafe impl Pod for aarch64::float32x2x2_t {}
#[cfg(all(target_arch = "aarch64", feature = "aarch64_simd"))]
unsafe impl Pod for aarch64::float32x2x3_t {}
#[cfg(all(target_arch = "aarch64", feature = "aarch64_simd"))]
unsafe impl Pod for aarch64::float32x2x4_t {}
#[cfg(all(target_arch = "aarch64", feature = "aarch64_simd"))]
unsafe impl Pod for aarch64::float32x4_t {}
#[cfg(all(target_arch = "aarch64", feature = "aarch64_simd"))]
unsafe impl Pod for aarch64::float32x4x2_t {}
#[cfg(all(target_arch = "aarch64", feature = "aarch64_simd"))]
unsafe impl Pod for aarch64::float32x4x3_t {}
#[cfg(all(target_arch = "aarch64", feature = "aarch64_simd"))]
unsafe impl Pod for aarch64::float32x4x4_t {}
#[cfg(all(target_arch = "aarch64", feature = "aarch64_simd"))]
unsafe impl Pod for aarch64::float64x1_t {}
#[cfg(all(target_arch = "aarch64", feature = "aarch64_simd"))]
unsafe impl Pod for aarch64::float64x1x2_t {}
#[cfg(all(target_arch = "aarch64", feature = "aarch64_simd"))]
unsafe impl Pod for aarch64::float64x1x3_t {}
#[cfg(all(target_arch = "aarch64", feature = "aarch64_simd"))]
unsafe impl Pod for aarch64::float64x1x4_t {}
#[cfg(all(target_arch = "aarch64", feature = "aarch64_simd"))]
unsafe impl Pod for aarch64::float64x2_t {}
#[cfg(all(target_arch = "aarch64", feature = "aarch64_simd"))]
unsafe impl Pod for aarch64::float64x2x2_t {}
#[cfg(all(target_arch = "aarch64", feature = "aarch64_simd"))]
unsafe impl Pod for aarch64::float64x2x3_t {}
#[cfg(all(target_arch = "aarch64", feature = "aarch64_simd"))]
unsafe impl Pod for aarch64::float64x2x4_t {}
#[cfg(all(target_arch = "aarch64", feature = "aarch64_simd"))]
unsafe impl Pod for aarch64::int16x4_t {}
#[cfg(all(target_arch = "aarch64", feature = "aarch64_simd"))]
unsafe impl Pod for aarch64::int16x4x2_t {}
#[cfg(all(target_arch = "aarch64", feature = "aarch64_simd"))]
unsafe impl Pod for aarch64::int16x4x3_t {}
#[cfg(all(target_arch = "aarch64", feature = "aarch64_simd"))]
unsafe impl Pod for aarch64::int16x4x4_t {}
#[cfg(all(target_arch = "aarch64", feature = "aarch64_simd"))]
unsafe impl Pod for aarch64::int16x8_t {}
#[cfg(all(target_arch = "aarch64", feature = "aarch64_simd"))]
unsafe impl Pod for aarch64::int16x8x2_t {}
#[cfg(all(target_arch = "aarch64", feature = "aarch64_simd"))]
unsafe impl Pod for aarch64::int16x8x3_t {}
#[cfg(all(target_arch = "aarch64", feature = "aarch64_simd"))]
unsafe impl Pod for aarch64::int16x8x4_t {}
#[cfg(all(target_arch = "aarch64", feature = "aarch64_simd"))]
unsafe impl Pod for aarch64::int32x2_t {}
#[cfg(all(target_arch = "aarch64", feature = "aarch64_simd"))]
unsafe impl Pod for aarch64::int32x2x2_t {}
#[cfg(all(target_arch = "aarch64", feature = "aarch64_simd"))]
unsafe impl Pod for aarch64::int32x2x3_t {}
#[cfg(all(target_arch = "aarch64", feature = "aarch64_simd"))]
unsafe impl Pod for aarch64::int32x2x4_t {}
#[cfg(all(target_arch = "aarch64", feature = "aarch64_simd"))]
unsafe impl Pod for aarch64::int32x4_t {}
#[cfg(all(target_arch = "aarch64", feature = "aarch64_simd"))]
unsafe impl Pod for aarch64::int32x4x2_t {}
#[cfg(all(target_arch = "aarch64", feature = "aarch64_simd"))]
unsafe impl Pod for aarch64::int32x4x3_t {}
#[cfg(all(target_arch = "aarch64", feature = "aarch64_simd"))]
unsafe impl Pod for aarch64::int32x4x4_t {}
#[cfg(all(target_arch = "aarch64", feature = "aarch64_simd"))]
unsafe impl Pod for aarch64::int64x1_t {}
#[cfg(all(target_arch = "aarch64", feature = "aarch64_simd"))]
unsafe impl Pod for aarch64::int64x1x2_t {}
#[cfg(all(target_arch = "aarch64", feature = "aarch64_simd"))]
unsafe impl Pod for aarch64::int64x1x3_t {}
#[cfg(all(target_arch = "aarch64", feature = "aarch64_simd"))]
unsafe impl Pod for aarch64::int64x1x4_t {}
#[cfg(all(target_arch = "aarch64", feature = "aarch64_simd"))]
unsafe impl Pod for aarch64::int64x2_t {}
#[cfg(all(target_arch = "aarch64", feature = "aarch64_simd"))]
unsafe impl Pod for aarch64::int64x2x2_t {}
#[cfg(all(target_arch = "aarch64", feature = "aarch64_simd"))]
unsafe impl Pod for aarch64::int64x2x3_t {}
#[cfg(all(target_arch = "aarch64", feature = "aarch64_simd"))]
unsafe impl Pod for aarch64::int64x2x4_t {}
#[cfg(all(target_arch = "aarch64", feature = "aarch64_simd"))]
unsafe impl Pod for aarch64::int8x16_t {}
#[cfg(all(target_arch = "aarch64", feature = "aarch64_simd"))]
unsafe impl Pod for aarch64::int8x16x2_t {}
#[cfg(all(target_arch = "aarch64", feature = "aarch64_simd"))]
unsafe impl Pod for aarch64::int8x16x3_t {}
#[cfg(all(target_arch = "aarch64", feature = "aarch64_simd"))]
unsafe impl Pod for aarch64::int8x16x4_t {}
#[cfg(all(target_arch = "aarch64", feature = "aarch64_simd"))]
unsafe impl Pod for aarch64::int8x8_t {}
#[cfg(all(target_arch = "aarch64", feature = "aarch64_simd"))]
unsafe impl Pod for aarch64::int8x8x2_t {}
#[cfg(all(target_arch = "aarch64", feature = "aarch64_simd"))]
unsafe impl Pod for aarch64::int8x8x3_t {}
#[cfg(all(target_arch = "aarch64", feature = "aarch64_simd"))]
unsafe impl Pod for aarch64::int8x8x4_t {}
#[cfg(all(target_arch = "aarch64", feature = "aarch64_simd"))]
unsafe impl Pod for aarch64::poly16x4_t {}
#[cfg(all(target_arch = "aarch64", feature = "aarch64_simd"))]
unsafe impl Pod for aarch64::poly16x4x2_t {}
#[cfg(all(target_arch = "aarch64", feature = "aarch64_simd"))]
unsafe impl Pod for aarch64::poly16x4x3_t {}
#[cfg(all(target_arch = "aarch64", feature = "aarch64_simd"))]
unsafe impl Pod for aarch64::poly16x4x4_t {}
#[cfg(all(target_arch = "aarch64", feature = "aarch64_simd"))]
unsafe impl Pod for aarch64::poly16x8_t {}
#[cfg(all(target_arch = "aarch64", feature = "aarch64_simd"))]
unsafe impl Pod for aarch64::poly16x8x2_t {}
#[cfg(all(target_arch = "aarch64", feature = "aarch64_simd"))]
unsafe impl Pod for aarch64::poly16x8x3_t {}
#[cfg(all(target_arch = "aarch64", feature = "aarch64_simd"))]
unsafe impl Pod for aarch64::poly16x8x4_t {}
#[cfg(all(target_arch = "aarch64", feature = "aarch64_simd"))]
unsafe impl Pod for aarch64::poly64x1_t {}
#[cfg(all(target_arch = "aarch64", feature = "aarch64_simd"))]
unsafe impl Pod for aarch64::poly64x1x2_t {}
#[cfg(all(target_arch = "aarch64", feature = "aarch64_simd"))]
unsafe impl Pod for aarch64::poly64x1x3_t {}
#[cfg(all(target_arch = "aarch64", feature = "aarch64_simd"))]
unsafe impl Pod for aarch64::poly64x1x4_t {}
#[cfg(all(target_arch = "aarch64", feature = "aarch64_simd"))]
unsafe impl Pod for aarch64::poly64x2_t {}
#[cfg(all(target_arch = "aarch64", feature = "aarch64_simd"))]
unsafe impl Pod for aarch64::poly64x2x2_t {}
#[cfg(all(target_arch = "aarch64", feature = "aarch64_simd"))]
unsafe impl Pod for aarch64::poly64x2x3_t {}
#[cfg(all(target_arch = "aarch64", feature = "aarch64_simd"))]
unsafe impl Pod for aarch64::poly64x2x4_t {}
#[cfg(all(target_arch = "aarch64", feature = "aarch64_simd"))]
unsafe impl Pod for aarch64::poly8x16_t {}
#[cfg(all(target_arch = "aarch64", feature = "aarch64_simd"))]
unsafe impl Pod for aarch64::poly8x16x2_t {}
#[cfg(all(target_arch = "aarch64", feature = "aarch64_simd"))]
unsafe impl Pod for aarch64::poly8x16x3_t {}
#[cfg(all(target_arch = "aarch64", feature = "aarch64_simd"))]
unsafe impl Pod for aarch64::poly8x16x4_t {}
#[cfg(all(target_arch = "aarch64", feature = "aarch64_simd"))]
unsafe impl Pod for aarch64::poly8x8_t {}
#[cfg(all(target_arch = "aarch64", feature = "aarch64_simd"))]
unsafe impl Pod for aarch64::poly8x8x2_t {}
#[cfg(all(target_arch = "aarch64", feature = "aarch64_simd"))]
unsafe impl Pod for aarch64::poly8x8x3_t {}
#[cfg(all(target_arch = "aarch64", feature = "aarch64_simd"))]
unsafe impl Pod for aarch64::poly8x8x4_t {}
#[cfg(all(target_arch = "aarch64", feature = "aarch64_simd"))]
unsafe impl Pod for aarch64::uint16x4_t {}
#[cfg(all(target_arch = "aarch64", feature = "aarch64_simd"))]
unsafe impl Pod for aarch64::uint16x4x2_t {}
#[cfg(all(target_arch = "aarch64", feature = "aarch64_simd"))]
unsafe impl Pod for aarch64::uint16x4x3_t {}
#[cfg(all(target_arch = "aarch64", feature = "aarch64_simd"))]
unsafe impl Pod for aarch64::uint16x4x4_t {}
#[cfg(all(target_arch = "aarch64", feature = "aarch64_simd"))]
unsafe impl Pod for aarch64::uint16x8_t {}
#[cfg(all(target_arch = "aarch64", feature = "aarch64_simd"))]
unsafe impl Pod for aarch64::uint16x8x2_t {}
#[cfg(all(target_arch = "aarch64", feature = "aarch64_simd"))]
unsafe impl Pod for aarch64::uint16x8x3_t {}
#[cfg(all(target_arch = "aarch64", feature = "aarch64_simd"))]
unsafe impl Pod for aarch64::uint16x8x4_t {}
#[cfg(all(target_arch = "aarch64", feature = "aarch64_simd"))]
unsafe impl Pod for aarch64::uint32x2_t {}
#[cfg(all(target_arch = "aarch64", feature = "aarch64_simd"))]
unsafe impl Pod for aarch64::uint32x2x2_t {}
#[cfg(all(target_arch = "aarch64", feature = "aarch64_simd"))]
unsafe impl Pod for aarch64::uint32x2x3_t {}
#[cfg(all(target_arch = "aarch64", feature = "aarch64_simd"))]
unsafe impl Pod for aarch64::uint32x2x4_t {}
#[cfg(all(target_arch = "aarch64", feature = "aarch64_simd"))]
unsafe impl Pod for aarch64::uint32x4_t {}
#[cfg(all(target_arch = "aarch64", feature = "aarch64_simd"))]
unsafe impl Pod for aarch64::uint32x4x2_t {}
#[cfg(all(target_arch = "aarch64", feature = "aarch64_simd"))]
unsafe impl Pod for aarch64::uint32x4x3_t {}
#[cfg(all(target_arch = "aarch64", feature = "aarch64_simd"))]
unsafe impl Pod for aarch64::uint32x4x4_t {}
#[cfg(all(target_arch = "aarch64", feature = "aarch64_simd"))]
unsafe impl Pod for aarch64::uint64x1_t {}
#[cfg(all(target_arch = "aarch64", feature = "aarch64_simd"))]
unsafe impl Pod for aarch64::uint64x1x2_t {}
#[cfg(all(target_arch = "aarch64", feature = "aarch64_simd"))]
unsafe impl Pod for aarch64::uint64x1x3_t {}
#[cfg(all(target_arch = "aarch64", feature = "aarch64_simd"))]
unsafe impl Pod for aarch64::uint64x1x4_t {}
#[cfg(all(target_arch = "aarch64", feature = "aarch64_simd"))]
unsafe impl Pod for aarch64::uint64x2_t {}
#[cfg(all(target_arch = "aarch64", feature = "aarch64_simd"))]
unsafe impl Pod for aarch64::uint64x2x2_t {}
#[cfg(all(target_arch = "aarch64", feature = "aarch64_simd"))]
unsafe impl Pod for aarch64::uint64x2x3_t {}
#[cfg(all(target_arch = "aarch64", feature = "aarch64_simd"))]
unsafe impl Pod for aarch64::uint64x2x4_t {}
#[cfg(all(target_arch = "aarch64", feature = "aarch64_simd"))]
unsafe impl Pod for aarch64::uint8x16_t {}
#[cfg(all(target_arch = "aarch64", feature = "aarch64_simd"))]
unsafe impl Pod for aarch64::uint8x16x2_t {}
#[cfg(all(target_arch = "aarch64", feature = "aarch64_simd"))]
unsafe impl Pod for aarch64::uint8x16x3_t {}
#[cfg(all(target_arch = "aarch64", feature = "aarch64_simd"))]
unsafe impl Pod for aarch64::uint8x16x4_t {}
#[cfg(all(target_arch = "aarch64", feature = "aarch64_simd"))]
unsafe impl Pod for aarch64::uint8x8_t {}
#[cfg(all(target_arch = "aarch64", feature = "aarch64_simd"))]
unsafe impl Pod for aarch64::uint8x8x2_t {}
#[cfg(all(target_arch = "aarch64", feature = "aarch64_simd"))]
unsafe impl Pod for aarch64::uint8x8x3_t {}
#[cfg(all(target_arch = "aarch64", feature = "aarch64_simd"))]
unsafe impl Pod for aarch64::uint8x8x4_t {}

#[cfg(target_arch = "x86")]
unsafe impl Pod for x86::__m128i {}
#[cfg(target_arch = "x86")]
unsafe impl Pod for x86::__m128 {}
#[cfg(target_arch = "x86")]
unsafe impl Pod for x86::__m128d {}
#[cfg(target_arch = "x86")]
unsafe impl Pod for x86::__m256i {}
#[cfg(target_arch = "x86")]
unsafe impl Pod for x86::__m256 {}
#[cfg(target_arch = "x86")]
unsafe impl Pod for x86::__m256d {}

#[cfg(target_arch = "x86_64")]
unsafe impl Pod for x86_64::__m128i {}
#[cfg(target_arch = "x86_64")]
unsafe impl Pod for x86_64::__m128 {}
#[cfg(target_arch = "x86_64")]
unsafe impl Pod for x86_64::__m128d {}
#[cfg(target_arch = "x86_64")]
unsafe impl Pod for x86_64::__m256i {}
#[cfg(target_arch = "x86_64")]
unsafe impl Pod for x86_64::__m256 {}
#[cfg(target_arch = "x86_64")]
unsafe impl Pod for x86_64::__m256d {}

#[cfg(feature = "nightly_portable_simd")]
unsafe impl<T, const N: usize> Pod for core::simd::Simd<T, N>
where
  T: core::simd::SimdElement + Pod,
  core::simd::LaneCount<N>: core::simd::SupportedLaneCount,
{
}