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

// Copyright 2020 Google Inc. All Rights Reserved.
//
// Licensed under the Apache License, Version 2.0 (the "License");
// you may not use this file except in compliance with the License.
// You may obtain a copy of the License at
//
//     http://www.apache.org/licenses/LICENSE-2.0
//
// Unless required by applicable law or agreed to in writing, software
// distributed under the License is distributed on an "AS IS" BASIS,
// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
// See the License for the specific language governing permissions and
// limitations under the License.

use super::MemArg;
#[cfg(feature = "multi-memory")]
use crate::instructions::MemId;
use crate::io::{Decode, DecodeError, Encode, Wasmbin};
use crate::visit::Visit;

/// Variant of [`MemArg`] with a fixed compile-time alignment.
#[derive(Debug, PartialEq, Eq, Hash, Clone, Visit)]
pub struct AlignedMemArg<const ALIGN_LOG2: u32> {
    #[cfg(feature = "multi-memory")]
    pub memory: MemId,
    pub offset: u32,
}

impl<const ALIGN_LOG2: u32> From<AlignedMemArg<ALIGN_LOG2>> for MemArg {
    fn from(arg: AlignedMemArg<ALIGN_LOG2>) -> MemArg {
        MemArg {
            align_log2: ALIGN_LOG2,
            #[cfg(feature = "multi-memory")]
            memory: arg.memory,
            offset: arg.offset,
        }
    }
}

impl<const ALIGN_LOG2: u32> Encode for AlignedMemArg<ALIGN_LOG2> {
    fn encode(&self, encoder: &mut impl std::io::Write) -> std::io::Result<()> {
        MemArg::from(self.clone()).encode(encoder)
    }
}

impl<const ALIGN_LOG2: u32> Decode for AlignedMemArg<ALIGN_LOG2> {
    fn decode(decoder: &mut impl std::io::Read) -> Result<Self, DecodeError> {
        let arg = MemArg::decode(decoder)?;
        if arg.align_log2 != ALIGN_LOG2 {
            return Err(DecodeError::unsupported_discriminant::<Self>(arg.offset));
        }
        Ok(Self {
            #[cfg(feature = "multi-memory")]
            memory: arg.memory,
            offset: arg.offset,
        })
    }
}

pub type MemArg8 = AlignedMemArg<0>;
pub type MemArg16 = AlignedMemArg<1>;
pub type MemArg32 = AlignedMemArg<2>;
pub type MemArg64 = AlignedMemArg<3>;

/// [Atomic memory instructions](https://webassembly.github.io/threads/core/binary/instructions.html#atomic-memory-instructions).
#[derive(Wasmbin, Debug, PartialEq, Eq, Hash, Clone, Visit)]
#[repr(u8)]
pub enum Atomic {
    Wake(MemArg32) = 0x00,
    I32Wait(MemArg32) = 0x01,
    I64Wait(MemArg64) = 0x02,
    I32Load(MemArg32) = 0x10,
    I64Load(MemArg64) = 0x11,
    I32Load8U(MemArg8) = 0x12,
    I32Load16U(MemArg16) = 0x13,
    I64Load8U(MemArg8) = 0x14,
    I64Load16U(MemArg16) = 0x15,
    I64Load32U(MemArg32) = 0x16,
    I32Store(MemArg32) = 0x17,
    I64Store(MemArg64) = 0x18,
    I32Store8(MemArg8) = 0x19,
    I32Store16(MemArg16) = 0x1A,
    I64Store8(MemArg8) = 0x1B,
    I64Store16(MemArg16) = 0x1C,
    I64Store32(MemArg32) = 0x1D,
    I32RmwAdd(MemArg32) = 0x1E,
    I64RmwAdd(MemArg64) = 0x1F,
    I32Rmw8AddU(MemArg8) = 0x20,
    I32Rmw16AddU(MemArg16) = 0x21,
    I64Rmw8AddU(MemArg8) = 0x22,
    I64Rmw16AddU(MemArg16) = 0x23,
    I64Rmw32AddU(MemArg32) = 0x24,
    I32RmwSub(MemArg32) = 0x25,
    I64RmwSub(MemArg64) = 0x26,
    I32Rmw8SubU(MemArg8) = 0x27,
    I32Rmw16SubU(MemArg16) = 0x28,
    I64Rmw8SubU(MemArg8) = 0x29,
    I64Rmw16SubU(MemArg16) = 0x2A,
    I64Rmw32SubU(MemArg32) = 0x2B,
    I32RmwAnd(MemArg32) = 0x2C,
    I64RmwAnd(MemArg64) = 0x2D,
    I32Rmw8AndU(MemArg8) = 0x2E,
    I32Rmw16AndU(MemArg16) = 0x2F,
    I64Rmw8AndU(MemArg8) = 0x30,
    I64Rmw16AndU(MemArg16) = 0x31,
    I64Rmw32AndU(MemArg32) = 0x32,
    I32RmwOr(MemArg32) = 0x33,
    I64RmwOr(MemArg64) = 0x34,
    I32Rmw8OrU(MemArg8) = 0x35,
    I32Rmw16OrU(MemArg16) = 0x36,
    I64Rmw8OrU(MemArg8) = 0x37,
    I64Rmw16OrU(MemArg16) = 0x38,
    I64Rmw32OrU(MemArg32) = 0x39,
    I32RmwXor(MemArg32) = 0x3A,
    I64RmwXor(MemArg64) = 0x3B,
    I32Rmw8XorU(MemArg8) = 0x3C,
    I32Rmw16XorU(MemArg16) = 0x3D,
    I64Rmw8XorU(MemArg8) = 0x3E,
    I64Rmw16XorU(MemArg16) = 0x3F,
    I64Rmw32XorU(MemArg32) = 0x40,
    I32RmwXchg(MemArg32) = 0x41,
    I64RmwXchg(MemArg64) = 0x42,
    I32Rmw8XchgU(MemArg8) = 0x43,
    I32Rmw16XchgU(MemArg16) = 0x44,
    I64Rmw8XchgU(MemArg8) = 0x45,
    I64Rmw16XchgU(MemArg16) = 0x46,
    I64Rmw32XchgU(MemArg32) = 0x47,
    I32RmwCmpXchg(MemArg32) = 0x48,
    I64RmwCmpXchg(MemArg64) = 0x49,
    I32Rmw8CmpXchgU(MemArg8) = 0x4A,
    I32Rmw16CmpXchgU(MemArg16) = 0x4B,
    I64Rmw8CmpXchgU(MemArg8) = 0x4C,
    I64Rmw16CmpXchgU(MemArg16) = 0x4D,
    I64Rmw32CmpXchgU(MemArg32) = 0x4E,
}