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

//! This is an internal module, no stability guarantees are provided. Use at
//! your own risk.

#![doc(hidden)]

use crate::{Clamped, JsValue};

macro_rules! tys {
    ($($a:ident)*) => (tys! { @ ($($a)*) 0 });
    (@ () $v:expr) => {};
    (@ ($a:ident $($b:ident)*) $v:expr) => {
        pub const $a: u32 = $v;
        tys!(@ ($($b)*) $v+1);
    }
}

// NB: this list must be kept in sync with `crates/cli-support/src/descriptor.rs`
tys! {
    I8
    U8
    I16
    U16
    I32
    U32
    I64
    U64
    F32
    F64
    BOOLEAN
    FUNCTION
    CLOSURE
    STRING
    REF
    REFMUT
    SLICE
    VECTOR
    ANYREF
    ENUM
    RUST_STRUCT
    CHAR
    OPTIONAL
    UNIT
    CLAMPED
}

#[inline(always)] // see `interpret.rs` in the the cli-support crate
pub fn inform(a: u32) {
    unsafe { super::__wbindgen_describe(a) }
}

pub trait WasmDescribe {
    fn describe();
}

macro_rules! simple {
    ($($t:ident => $d:ident)*) => ($(
        impl WasmDescribe for $t {
            fn describe() { inform($d) }
        }
    )*)
}

simple! {
    i8 => I8
    u8 => U8
    i16 => I16
    u16 => U16
    i32 => I32
    u32 => U32
    i64 => I64
    u64 => U64
    isize => I32
    usize => U32
    f32 => F32
    f64 => F64
    bool => BOOLEAN
    char => CHAR
    str => STRING
    JsValue => ANYREF
}

impl<T> WasmDescribe for *const T {
    fn describe() {
        inform(I32)
    }
}

impl<T> WasmDescribe for *mut T {
    fn describe() {
        inform(I32)
    }
}

impl<T: WasmDescribe> WasmDescribe for [T] {
    fn describe() {
        inform(SLICE);
        T::describe();
    }
}

impl<'a, T: WasmDescribe + ?Sized> WasmDescribe for &'a T {
    fn describe() {
        inform(REF);
        T::describe();
    }
}

impl<'a, T: WasmDescribe + ?Sized> WasmDescribe for &'a mut T {
    fn describe() {
        inform(REFMUT);
        T::describe();
    }
}

if_std! {
    use std::prelude::v1::*;

    impl WasmDescribe for String {
        fn describe() { inform(STRING) }
    }

    impl<T: WasmDescribe> WasmDescribe for Box<[T]> {
        fn describe() {
            inform(VECTOR);
            T::describe();
        }
    }

    impl<T> WasmDescribe for Vec<T> where Box<[T]>: WasmDescribe {
        fn describe() {
            <Box<[T]>>::describe();
        }
    }
}

impl<T: WasmDescribe> WasmDescribe for Option<T> {
    fn describe() {
        inform(OPTIONAL);
        T::describe();
    }
}

impl WasmDescribe for () {
    fn describe() {
        inform(UNIT)
    }
}

// Note that this is only for `ReturnWasmAbi for Result<T, JsValue>`, which
// throws the result, so we only need to inform about the `T`.
impl<T: WasmDescribe> WasmDescribe for Result<T, JsValue> {
    fn describe() {
        T::describe()
    }
}

impl<T: WasmDescribe> WasmDescribe for Clamped<T> {
    fn describe() {
        inform(CLAMPED);
        T::describe();
    }
}