mirror of
https://github.com/fluencelabs/assemblyscript
synced 2025-06-13 23:11:41 +00:00
39b489bee2
* Rename memory instructions as proposed by the bulk-memory-operations spec. * Rename memory manager functions to memory.* as well * Remove automatic inlining of constant globals (Binaryen does this now) * Improve 'const' enum compatibility * Improve module-level export generation * Enable the inline decorator for constant variables * Add ERROR, WARNING and INFO macros that emit a user-defined diagnostic * Reintroduce builtin decorator so these can appear anywhere in stdlib again * Inline isNaN and isFinite by default * Make an interface around gc.* similar to memory.* * Emit an error when trying to inline a mutable variable * Slim down CI stages * Add a more convenient tracing utility for debugging * Implement some prequesites for an eventual bundled GC
31 lines
938 B
TypeScript
31 lines
938 B
TypeScript
import {
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HEADER_SIZE,
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MAX_BLENGTH,
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allocUnsafe
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} from "./internal/arraybuffer";
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@sealed
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export class ArrayBuffer {
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readonly byteLength: i32; // capped to [0, MAX_LENGTH]
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constructor(length: i32, unsafe: bool = false) {
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if (<u32>length > <u32>MAX_BLENGTH) throw new RangeError("Invalid array buffer length");
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var buffer = allocUnsafe(length);
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if (!unsafe) memory.fill(changetype<usize>(buffer) + HEADER_SIZE, 0, <usize>length);
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return buffer;
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}
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slice(begin: i32 = 0, end: i32 = MAX_BLENGTH): ArrayBuffer {
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var len = this.byteLength;
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if (begin < 0) begin = max(len + begin, 0);
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else begin = min(begin, len);
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if (end < 0) end = max(len + end, 0);
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else end = min(end, len);
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var newLen = max(end - begin, 0);
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var buffer = allocUnsafe(newLen);
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memory.copy(changetype<usize>(buffer) + HEADER_SIZE, changetype<usize>(this) + HEADER_SIZE + begin, newLen);
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return buffer;
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}
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}
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