mirror of
https://github.com/fluencelabs/assemblyscript
synced 2025-04-27 16:02:16 +00:00
89 lines
4.0 KiB
TypeScript
89 lines
4.0 KiB
TypeScript
// Alignment guarantees
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// @ts-ignore: decorator
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@inline export const AL_BITS: u32 = 4; // 16 bytes to fit up to v128
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// @ts-ignore: decorator
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@inline export const AL_SIZE: usize = 1 << <usize>AL_BITS;
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// @ts-ignore: decorator
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@inline export const AL_MASK: usize = AL_SIZE - 1;
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// Extra debugging
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// @ts-ignore: decorator
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@inline export const DEBUG = true;
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// ╒════════════════ Common block layout (32-bit) ═════════════════╕
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// 3 2 1
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// 1 0 9 8 7 6 5 4 3 2 1 0 9 8 7 6 5 4 3 2 1 0 9 8 7 6 5 4 3 2 1 0 bits
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// ├─┴─┴─┴─┴─┴─┴─┴─┴─┴─┴─┴─┴─┴─┴─┴─┴─┴─┴─┴─┴─┴─┴─┴─┴─┴─┴─┴─┴─┴─┴─┴─┤
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// │ MM info │ -16
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// ├───────────────────────────────────────────────────────────────┤
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// │ GC info │ -12
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// ├───────────────────────────────────────────────────────────────┤
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// │ runtime id │ -8
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// ├───────────────────────────────────────────────────────────────┤
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// │ runtime size │ -4
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// ╞═══════════════════════════════════════════════════════════════╡
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// │ ... │ ref
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@unmanaged export class BLOCK {
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/** Memory manager info. */
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mmInfo: usize; // WASM64 needs adaption
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/** Garbage collector info. */
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gcInfo: u32;
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/** Runtime class id. */
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rtId: u32;
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/** Runtime object size. */
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rtSize: u32;
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}
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// @ts-ignore: decorator
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@inline export const BLOCK_OVERHEAD = (offsetof<BLOCK>() + AL_MASK) & ~AL_MASK;
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// @ts-ignore: decorator
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@inline export const BLOCK_MAXSIZE: usize = (1 << 30) - BLOCK_OVERHEAD;
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/////////////////////////////////// Type information interface ////////////////////////////////////
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import { RTTI_BASE } from "builtins";
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import { RTTIData, RTTIFlags } from "common/rtti";
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// @ts-ignore: decorator
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@unsafe @global
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export function __typeinfo(id: u32): RTTIFlags {
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var ptr = RTTI_BASE;
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return !id || id > load<u32>(ptr)
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? unreachable()
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: changetype<RTTIData>(ptr + id * offsetof<RTTIData>()).flags;
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}
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// @ts-ignore: decorator
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@unsafe @global
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export function __instanceof(ref: usize, superId: u32): bool { // keyword
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var id = changetype<BLOCK>(ref - BLOCK_OVERHEAD).rtId;
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var ptr = RTTI_BASE;
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if (id && id <= load<u32>(ptr)) {
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do if (id == superId) return true;
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while (id = changetype<RTTIData>(ptr + id * offsetof<RTTIData>()).base);
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}
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return false;
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}
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///////////////////////////////////////////// Helpers /////////////////////////////////////////////
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import { idof } from "builtins";
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import { ArrayBufferView } from "arraybuffer";
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// @ts-ignore: decorator
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@unsafe @global
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export function __allocArray(length: i32, alignLog2: usize, id: u32, data: usize = 0): usize {
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var array = __alloc(offsetof<i32[]>(), id);
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var bufferSize = <usize>length << alignLog2;
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var buffer = __alloc(bufferSize, idof<ArrayBuffer>());
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changetype<ArrayBufferView>(array).data = changetype<ArrayBuffer>(buffer); // TODO/RT: retains
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changetype<ArrayBufferView>(array).dataStart = buffer;
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changetype<ArrayBufferView>(array).dataLength = bufferSize;
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store<i32>(changetype<usize>(array), length, offsetof<i32[]>("length_"));
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if (data) memory.copy(buffer, data, bufferSize);
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return array;
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}
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