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
#[cfg(feature = "std")]
use std::prelude::v1::*;

use core::slice;
use core::str;

use convert::{FromWasmAbi, IntoWasmAbi, RefFromWasmAbi, RefMutFromWasmAbi, WasmAbi};
use convert::{OptionIntoWasmAbi, Stack};

if_std! {
    use core::mem;
    use convert::OptionFromWasmAbi;
}

#[repr(C)]
pub struct WasmSlice {
    pub ptr: u32,
    pub len: u32,
}

unsafe impl WasmAbi for WasmSlice {}

#[inline]
fn null_slice() -> WasmSlice {
    WasmSlice { ptr: 0, len: 0 }
}

macro_rules! vectors {
    ($($t:ident)*) => ($(
        if_std! {
            impl IntoWasmAbi for Box<[$t]> {
                type Abi = WasmSlice;

                #[inline]
                fn into_abi(self, extra: &mut Stack) -> WasmSlice {
                    let ptr = self.as_ptr();
                    let len = self.len();
                    mem::forget(self);
                    WasmSlice {
                        ptr: ptr.into_abi(extra),
                        len: len as u32,
                    }
                }
            }

            impl OptionIntoWasmAbi for Box<[$t]> {
                fn none() -> WasmSlice { null_slice() }
            }

            impl FromWasmAbi for Box<[$t]> {
                type Abi = WasmSlice;

                #[inline]
                unsafe fn from_abi(js: WasmSlice, extra: &mut Stack) -> Self {
                    let ptr = <*mut $t>::from_abi(js.ptr, extra);
                    let len = js.len as usize;
                    Vec::from_raw_parts(ptr, len, len).into_boxed_slice()
                }
            }

            impl OptionFromWasmAbi for Box<[$t]> {
                fn is_none(slice: &WasmSlice) -> bool { slice.ptr == 0 }
            }
        }

        impl<'a> IntoWasmAbi for &'a [$t] {
            type Abi = WasmSlice;

            #[inline]
            fn into_abi(self, extra: &mut Stack) -> WasmSlice {
                WasmSlice {
                    ptr: self.as_ptr().into_abi(extra),
                    len: self.len() as u32,
                }
            }
        }

        impl<'a> OptionIntoWasmAbi for &'a [$t] {
            fn none() -> WasmSlice { null_slice() }
        }

        impl<'a> IntoWasmAbi for &'a mut [$t] {
            type Abi = WasmSlice;

            #[inline]
            fn into_abi(self, extra: &mut Stack) -> WasmSlice {
                (&*self).into_abi(extra)
            }
        }

        impl<'a> OptionIntoWasmAbi for &'a mut [$t] {
            fn none() -> WasmSlice { null_slice() }
        }

        impl RefFromWasmAbi for [$t] {
            type Abi = WasmSlice;
            type Anchor = &'static [$t];

            #[inline]
            unsafe fn ref_from_abi(js: WasmSlice, extra: &mut Stack) -> &'static [$t] {
                slice::from_raw_parts(
                    <*const $t>::from_abi(js.ptr, extra),
                    js.len as usize,
                )
            }
        }

        impl RefMutFromWasmAbi for [$t] {
            type Abi = WasmSlice;
            type Anchor = &'static mut [$t];

            #[inline]
            unsafe fn ref_mut_from_abi(js: WasmSlice, extra: &mut Stack)
                -> &'static mut [$t]
            {
                slice::from_raw_parts_mut(
                    <*mut $t>::from_abi(js.ptr, extra),
                    js.len as usize,
                )
            }
        }
    )*)
}

vectors! {
    u8 i8 u16 i16 u32 i32 u64 i64 f32 f64
}

if_std! {
    impl<T> IntoWasmAbi for Vec<T> where Box<[T]>: IntoWasmAbi<Abi = WasmSlice> {
        type Abi = <Box<[T]> as IntoWasmAbi>::Abi;

        fn into_abi(self, extra: &mut Stack) -> Self::Abi {
            self.into_boxed_slice().into_abi(extra)
        }
    }

    impl<T> OptionIntoWasmAbi for Vec<T> where Box<[T]>: IntoWasmAbi<Abi = WasmSlice> {
        fn none() -> WasmSlice { null_slice() }
    }

    impl<T> FromWasmAbi for Vec<T> where Box<[T]>: FromWasmAbi<Abi = WasmSlice> {
        type Abi = <Box<[T]> as FromWasmAbi>::Abi;

        unsafe fn from_abi(js: Self::Abi, extra: &mut Stack) -> Self {
            <Box<[T]>>::from_abi(js, extra).into()
        }
    }

    impl<T> OptionFromWasmAbi for Vec<T> where Box<[T]>: FromWasmAbi<Abi = WasmSlice> {
        fn is_none(abi: &WasmSlice) -> bool { abi.ptr == 0 }
    }

    impl IntoWasmAbi for String {
        type Abi = <Vec<u8> as IntoWasmAbi>::Abi;

        #[inline]
        fn into_abi(self, extra: &mut Stack) -> Self::Abi {
            self.into_bytes().into_abi(extra)
        }
    }

    impl OptionIntoWasmAbi for String {
        fn none() -> WasmSlice { null_slice() }
    }

    impl FromWasmAbi for String {
        type Abi = <Vec<u8> as FromWasmAbi>::Abi;

        #[inline]
        unsafe fn from_abi(js: Self::Abi, extra: &mut Stack) -> Self {
            String::from_utf8_unchecked(<Vec<u8>>::from_abi(js, extra))
        }
    }

    impl OptionFromWasmAbi for String {
        fn is_none(slice: &WasmSlice) -> bool { slice.ptr == 0 }
    }
}

impl<'a> IntoWasmAbi for &'a str {
    type Abi = <&'a [u8] as IntoWasmAbi>::Abi;

    #[inline]
    fn into_abi(self, extra: &mut Stack) -> Self::Abi {
        self.as_bytes().into_abi(extra)
    }
}

impl<'a> OptionIntoWasmAbi for &'a str {
    fn none() -> WasmSlice {
        null_slice()
    }
}

impl RefFromWasmAbi for str {
    type Abi = <[u8] as RefFromWasmAbi>::Abi;
    type Anchor = &'static str;

    #[inline]
    unsafe fn ref_from_abi(js: Self::Abi, extra: &mut Stack) -> Self::Anchor {
        str::from_utf8_unchecked(<[u8]>::ref_from_abi(js, extra))
    }
}

if_std! {
    use JsValue;

    impl IntoWasmAbi for Box<[JsValue]> {
        type Abi = WasmSlice;

        #[inline]
        fn into_abi(self, extra: &mut Stack) -> WasmSlice {
            let ptr = self.as_ptr();
            let len = self.len();
            mem::forget(self);
            WasmSlice {
                ptr: ptr.into_abi(extra),
                len: len as u32,
            }
        }
    }

    impl OptionIntoWasmAbi for Box<[JsValue]> {
        fn none() -> WasmSlice { null_slice() }
    }

    impl FromWasmAbi for Box<[JsValue]> {
        type Abi = WasmSlice;

        #[inline]
        unsafe fn from_abi(js: WasmSlice, extra: &mut Stack) -> Self {
            let ptr = <*mut JsValue>::from_abi(js.ptr, extra);
            let len = js.len as usize;
            Vec::from_raw_parts(ptr, len, len).into_boxed_slice()
        }
    }

    impl OptionFromWasmAbi for Box<[JsValue]> {
        fn is_none(slice: &WasmSlice) -> bool { slice.ptr == 0 }
    }
}