v8/
typed_array.rs

1// Copyright 2019-2021 the Deno authors. All rights reserved. MIT license.
2use crate::ArrayBuffer;
3use crate::HandleScope;
4use crate::Local;
5use crate::TypedArray;
6use crate::binding::v8__TypedArray__kMaxByteLength;
7use crate::support::size_t;
8use paste::paste;
9
10unsafe extern "C" {
11  fn v8__TypedArray__Length(this: *const TypedArray) -> size_t;
12}
13
14impl TypedArray {
15  /// The largest supported typed array byte size. Each subclass defines a
16  /// type-specific max_length for the maximum length that can be passed to new.
17  pub const MAX_BYTE_LENGTH: usize = v8__TypedArray__kMaxByteLength;
18
19  /// Number of elements in this typed array
20  /// (e.g. for Int16Array, |ByteLength|/2).
21  #[inline(always)]
22  pub fn length(&self) -> usize {
23    unsafe { v8__TypedArray__Length(self) }
24  }
25}
26
27macro_rules! typed_array {
28  ($name:ident) => {
29    paste! {
30      use crate::$name;
31
32      unsafe extern "C" {
33        fn [< v8__ $name __New >](
34          buf_ptr: *const ArrayBuffer,
35          byte_offset: usize,
36          length: usize,
37        ) -> *const $name;
38      }
39
40      impl $name {
41        #[inline(always)]
42        pub fn new<'s>(
43          scope: &mut HandleScope<'s>,
44          buf: Local<ArrayBuffer>,
45          byte_offset: usize,
46          length: usize,
47        ) -> Option<Local<'s, $name>> {
48          unsafe { scope.cast_local(|_| [< v8__ $name __New >](&*buf, byte_offset, length)) }
49        }
50
51        #[doc = concat!("The largest ", stringify!($name), " size that can be constructed using `new`.")]
52        pub const MAX_LENGTH: usize = crate::binding::[< v8__ $name __kMaxLength >];
53      }
54    }
55  };
56}
57
58typed_array!(Uint8Array);
59typed_array!(Uint8ClampedArray);
60typed_array!(Int8Array);
61typed_array!(Uint16Array);
62typed_array!(Int16Array);
63typed_array!(Uint32Array);
64typed_array!(Int32Array);
65typed_array!(Float32Array);
66typed_array!(Float64Array);
67typed_array!(BigUint64Array);
68typed_array!(BigInt64Array);
v8/typed_array.rs

v8/
typed_array.rs
