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use overloads for checked access

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dcode
2019-03-18 16:09:49 +01:00
parent c147e98a55
commit 0932cf17ed
20 changed files with 9141 additions and 11890 deletions
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20
std/assembly/array.ts
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@ -6,10 +6,9 @@ import { isArray as builtin_isArray } from "./builtins";
/** Ensures that the given array has _at least_ the specified capacity. */
function ensureCapacity(array: ArrayBufferView, minCapacity: i32, alignLog2: u32): void {
var oldData = array.data;
var oldCapacity = oldData.byteLength >>> alignLog2;
if (<u32>minCapacity > <u32>oldCapacity) {
if (<u32>minCapacity > <u32>array.dataLength >>> alignLog2) {
if (<u32>minCapacity > <u32>(MAX_BYTELENGTH >>> alignLog2)) throw new RangeError("Invalid array length");
let oldData = array.data;
let newByteLength = minCapacity << alignLog2;
let newData = REALLOCATE(changetype<usize>(oldData), <usize>newByteLength); // registers on move
if (newData !== changetype<usize>(oldData)) {
@ -21,6 +20,11 @@ function ensureCapacity(array: ArrayBufferView, minCapacity: i32, alignLog2: u32
}
export class Array<T> extends ArrayBufferView {
// Implementing ArrayBufferView isn't strictly necessary here but is done to allow glue code
// to work with typed and normal arrays interchangeably. Technically, normal arrays do not need
// `dataStart` (equals `data`) and `dataLength` (equals computed `data.byteLength`).
private length_: i32;
static isArray<U>(value: U): bool {
@ -59,8 +63,14 @@ export class Array<T> extends ArrayBufferView {
return -1;
}
@operator("[]=")
private __set(index: i32, value: T): void { // unchecked is built-in
@operator("[]") // unchecked is built-in
private __get(index: i32): T {
if (<u32>index >= <u32>this.dataLength >>> alignof<T>()) throw new Error("Offset out of bounds");
return load<T>(this.dataStart + (<usize>index << alignof<T>()));
}
@operator("[]=") // unchecked is built-in
private __set(index: i32, value: T): void {
ensureCapacity(this, index + 1, alignof<T>());
store<T>(this.dataStart + (<usize>index << alignof<T>()), value);
if (isManaged<T>()) LINK(value, this);