428 lines
15 KiB
JavaScript
428 lines
15 KiB
JavaScript
"use strict";
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// Runtime header offsets
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const ID_OFFSET = -8;
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const SIZE_OFFSET = -4;
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// Runtime ids
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const ARRAYBUFFER_ID = 0;
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const STRING_ID = 1;
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// const ARRAYBUFFERVIEW_ID = 2;
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// Runtime type information
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const ARRAYBUFFERVIEW = 1 << 0;
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const ARRAY = 1 << 1;
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const STATICARRAY = 1 << 2;
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// const SET = 1 << 3;
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// const MAP = 1 << 4;
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const VAL_ALIGN_OFFSET = 6;
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// const VAL_ALIGN = 1 << VAL_ALIGN_OFFSET;
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const VAL_SIGNED = 1 << 11;
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const VAL_FLOAT = 1 << 12;
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// const VAL_NULLABLE = 1 << 13;
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const VAL_MANAGED = 1 << 14;
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// const KEY_ALIGN_OFFSET = 15;
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// const KEY_ALIGN = 1 << KEY_ALIGN_OFFSET;
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// const KEY_SIGNED = 1 << 20;
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// const KEY_FLOAT = 1 << 21;
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// const KEY_NULLABLE = 1 << 22;
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// const KEY_MANAGED = 1 << 23;
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// Array(BufferView) layout
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const ARRAYBUFFERVIEW_BUFFER_OFFSET = 0;
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const ARRAYBUFFERVIEW_DATASTART_OFFSET = 4;
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const ARRAYBUFFERVIEW_DATALENGTH_OFFSET = 8;
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const ARRAYBUFFERVIEW_SIZE = 12;
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const ARRAY_LENGTH_OFFSET = 12;
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const ARRAY_SIZE = 16;
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const BIGINT = typeof BigUint64Array !== "undefined";
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const THIS = Symbol();
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const CHUNKSIZE = 1024;
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/** Gets a string from an U32 and an U16 view on a memory. */
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function getStringImpl(buffer, ptr) {
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const U32 = new Uint32Array(buffer);
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const U16 = new Uint16Array(buffer);
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let length = U32[(ptr + SIZE_OFFSET) >>> 2] >>> 1;
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let offset = ptr >>> 1;
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if (length <= CHUNKSIZE) return String.fromCharCode.apply(String, U16.subarray(offset, offset + length));
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const parts = [];
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do {
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const last = U16[offset + CHUNKSIZE - 1];
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const size = last >= 0xD800 && last < 0xDC00 ? CHUNKSIZE - 1 : CHUNKSIZE;
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parts.push(String.fromCharCode.apply(String, U16.subarray(offset, offset += size)));
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length -= size;
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} while (length > CHUNKSIZE);
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return parts.join("") + String.fromCharCode.apply(String, U16.subarray(offset, offset + length));
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}
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/** Prepares the base module prior to instantiation. */
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function preInstantiate(imports) {
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const extendedExports = {};
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function getString(memory, ptr) {
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if (!memory) return "<yet unknown>";
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return getStringImpl(memory.buffer, ptr);
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}
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// add common imports used by stdlib for convenience
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const env = (imports.env = imports.env || {});
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env.abort = env.abort || function abort(msg, file, line, colm) {
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const memory = extendedExports.memory || env.memory; // prefer exported, otherwise try imported
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throw Error("abort: " + getString(memory, msg) + " at " + getString(memory, file) + ":" + line + ":" + colm);
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};
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env.trace = env.trace || function trace(msg, n) {
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const memory = extendedExports.memory || env.memory;
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console.log("trace: " + getString(memory, msg) + (n ? " " : "") + Array.prototype.slice.call(arguments, 2, 2 + n).join(", "));
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};
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env.seed = env.seed || function seed() {
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return Date.now();
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};
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imports.Math = imports.Math || Math;
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imports.Date = imports.Date || Date;
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return extendedExports;
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}
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/** Prepares the final module once instantiation is complete. */
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function postInstantiate(extendedExports, instance) {
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const exports = instance.exports;
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const memory = exports.memory;
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const table = exports.table;
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const alloc = exports["__alloc"];
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const retain = exports["__retain"];
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const rttiBase = exports["__rtti_base"] || ~0; // oob if not present
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/** Gets the runtime type info for the given id. */
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function getInfo(id) {
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const U32 = new Uint32Array(memory.buffer);
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const count = U32[rttiBase >>> 2];
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if ((id >>>= 0) >= count) throw Error("invalid id: " + id);
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return U32[(rttiBase + 4 >>> 2) + id * 2];
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}
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/** Gets the runtime base id for the given id. */
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function getBase(id) {
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const U32 = new Uint32Array(memory.buffer);
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const count = U32[rttiBase >>> 2];
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if ((id >>>= 0) >= count) throw Error("invalid id: " + id);
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return U32[(rttiBase + 4 >>> 2) + id * 2 + 1];
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}
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/** Gets the runtime alignment of a collection's values. */
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function getValueAlign(info) {
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return 31 - Math.clz32((info >>> VAL_ALIGN_OFFSET) & 31); // -1 if none
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}
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/** Gets the runtime alignment of a collection's keys. */
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// function getKeyAlign(info) {
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// return 31 - Math.clz32((info >>> KEY_ALIGN_OFFSET) & 31); // -1 if none
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// }
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/** Allocates a new string in the module's memory and returns its retained pointer. */
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function __allocString(str) {
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const length = str.length;
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const ptr = alloc(length << 1, STRING_ID);
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const U16 = new Uint16Array(memory.buffer);
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for (var i = 0, p = ptr >>> 1; i < length; ++i) U16[p + i] = str.charCodeAt(i);
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return ptr;
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}
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extendedExports.__allocString = __allocString;
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/** Reads a string from the module's memory by its pointer. */
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function __getString(ptr) {
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const buffer = memory.buffer;
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const id = new Uint32Array(buffer)[ptr + ID_OFFSET >>> 2];
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if (id !== STRING_ID) throw Error("not a string: " + ptr);
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return getStringImpl(buffer, ptr);
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}
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extendedExports.__getString = __getString;
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/** Gets the view matching the specified alignment, signedness and floatness. */
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function getView(alignLog2, signed, float) {
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const buffer = memory.buffer;
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if (float) {
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switch (alignLog2) {
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case 2: return new Float32Array(buffer);
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case 3: return new Float64Array(buffer);
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}
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} else {
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switch (alignLog2) {
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case 0: return new (signed ? Int8Array : Uint8Array)(buffer);
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case 1: return new (signed ? Int16Array : Uint16Array)(buffer);
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case 2: return new (signed ? Int32Array : Uint32Array)(buffer);
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case 3: return new (signed ? BigInt64Array : BigUint64Array)(buffer);
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}
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}
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throw Error("unsupported align: " + alignLog2);
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}
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/** Allocates a new array in the module's memory and returns its retained pointer. */
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function __allocArray(id, values) {
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const info = getInfo(id);
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if (!(info & (ARRAYBUFFERVIEW | ARRAY | STATICARRAY))) throw Error("not an array: " + id + ", flags= " + info);
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const align = getValueAlign(info);
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const length = values.length;
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const buf = alloc(length << align, info & STATICARRAY ? id : ARRAYBUFFER_ID);
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let result;
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if (info & STATICARRAY) {
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result = buf;
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} else {
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const arr = alloc(info & ARRAY ? ARRAY_SIZE : ARRAYBUFFERVIEW_SIZE, id);
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const U32 = new Uint32Array(memory.buffer);
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U32[arr + ARRAYBUFFERVIEW_BUFFER_OFFSET >>> 2] = retain(buf);
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U32[arr + ARRAYBUFFERVIEW_DATASTART_OFFSET >>> 2] = buf;
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U32[arr + ARRAYBUFFERVIEW_DATALENGTH_OFFSET >>> 2] = length << align;
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if (info & ARRAY) U32[arr + ARRAY_LENGTH_OFFSET >>> 2] = length;
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result = arr;
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}
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const view = getView(align, info & VAL_SIGNED, info & VAL_FLOAT);
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if (info & VAL_MANAGED) {
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for (let i = 0; i < length; ++i) view[(buf >>> align) + i] = retain(values[i]);
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} else {
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view.set(values, buf >>> align);
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}
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return result;
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}
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extendedExports.__allocArray = __allocArray;
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/** Gets a live view on an array's values in the module's memory. Infers the array type from RTTI. */
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function __getArrayView(arr) {
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const U32 = new Uint32Array(memory.buffer);
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const id = U32[arr + ID_OFFSET >>> 2];
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const info = getInfo(id);
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if (!(info & (ARRAYBUFFERVIEW | ARRAY | STATICARRAY))) throw Error("not an array: " + id + ", flags=" + info);
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const align = getValueAlign(info);
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let buf = info & STATICARRAY
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? arr
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: U32[arr + ARRAYBUFFERVIEW_DATASTART_OFFSET >>> 2];
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const length = info & ARRAY
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? U32[arr + ARRAY_LENGTH_OFFSET >>> 2]
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: U32[buf + SIZE_OFFSET >>> 2] >>> align;
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return getView(align, info & VAL_SIGNED, info & VAL_FLOAT).subarray(buf >>>= align, buf + length);
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}
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extendedExports.__getArrayView = __getArrayView;
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/** Copies an array's values from the module's memory. Infers the array type from RTTI. */
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function __getArray(arr) {
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const input = __getArrayView(arr);
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const len = input.length;
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const out = new Array(len);
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for (let i = 0; i < len; i++) out[i] = input[i];
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return out;
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}
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extendedExports.__getArray = __getArray;
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/** Copies an ArrayBuffer's value from the module's memory. */
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function __getArrayBuffer(ptr) {
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const buffer = memory.buffer;
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const length = new Uint32Array(buffer)[ptr + SIZE_OFFSET >>> 2];
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return buffer.slice(ptr, ptr + length);
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}
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extendedExports.__getArrayBuffer = __getArrayBuffer;
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/** Copies a typed array's values from the module's memory. */
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function getTypedArray(Type, alignLog2, ptr) {
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return new Type(getTypedArrayView(Type, alignLog2, ptr));
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}
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/** Gets a live view on a typed array's values in the module's memory. */
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function getTypedArrayView(Type, alignLog2, ptr) {
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const buffer = memory.buffer;
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const U32 = new Uint32Array(buffer);
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const bufPtr = U32[ptr + ARRAYBUFFERVIEW_DATASTART_OFFSET >>> 2];
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return new Type(buffer, bufPtr, U32[bufPtr + SIZE_OFFSET >>> 2] >>> alignLog2);
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}
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/** Attach a set of get TypedArray and View functions to the exports. */
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function attachTypedArrayFunctions(ctor, name, align) {
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extendedExports["__get" + name] = getTypedArray.bind(null, ctor, align);
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extendedExports["__get" + name + "View"] = getTypedArrayView.bind(null, ctor, align);
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}
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[
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Int8Array,
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Uint8Array,
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Uint8ClampedArray,
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Int16Array,
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Uint16Array,
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Int32Array,
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Uint32Array,
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Float32Array,
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Float64Array
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].forEach(ctor => {
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attachTypedArrayFunctions(ctor, ctor.name, 31 - Math.clz32(ctor.BYTES_PER_ELEMENT));
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});
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if (BIGINT) {
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[BigUint64Array, BigInt64Array].forEach(ctor => {
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attachTypedArrayFunctions(ctor, ctor.name.slice(3), 3);
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});
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}
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/** Tests whether an object is an instance of the class represented by the specified base id. */
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function __instanceof(ptr, baseId) {
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const U32 = new Uint32Array(memory.buffer);
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let id = U32[(ptr + ID_OFFSET) >>> 2];
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if (id <= U32[rttiBase >>> 2]) {
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do {
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if (id == baseId) return true;
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id = getBase(id);
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} while (id);
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}
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return false;
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}
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extendedExports.__instanceof = __instanceof;
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// Pull basic exports to extendedExports so code in preInstantiate can use them
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extendedExports.memory = extendedExports.memory || memory;
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extendedExports.table = extendedExports.table || table;
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// Demangle exports and provide the usual utility on the prototype
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return demangle(exports, extendedExports);
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}
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function isResponse(src) {
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return typeof Response !== "undefined" && src instanceof Response;
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}
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function isModule(src) {
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return src instanceof WebAssembly.Module;
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}
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/** Asynchronously instantiates an AssemblyScript module from anything that can be instantiated. */
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async function instantiate(source, imports = {}) {
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if (isResponse(source = await source)) return instantiateStreaming(source, imports);
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const module = isModule(source) ? source : await WebAssembly.compile(source);
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const extended = preInstantiate(imports);
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const instance = await WebAssembly.instantiate(module, imports);
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const exports = postInstantiate(extended, instance);
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return { module, instance, exports };
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}
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exports.instantiate = instantiate;
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/** Synchronously instantiates an AssemblyScript module from a WebAssembly.Module or binary buffer. */
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function instantiateSync(source, imports = {}) {
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const module = isModule(source) ? source : new WebAssembly.Module(source);
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const extended = preInstantiate(imports);
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const instance = new WebAssembly.Instance(module, imports);
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const exports = postInstantiate(extended, instance);
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return { module, instance, exports };
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}
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exports.instantiateSync = instantiateSync;
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/** Asynchronously instantiates an AssemblyScript module from a response, i.e. as obtained by `fetch`. */
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async function instantiateStreaming(source, imports = {}) {
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if (!WebAssembly.instantiateStreaming) {
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return instantiate(
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isResponse(source = await source)
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? source.arrayBuffer()
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: source,
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imports
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);
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}
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const extended = preInstantiate(imports);
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const result = await WebAssembly.instantiateStreaming(source, imports);
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const exports = postInstantiate(extended, result.instance);
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return { ...result, exports };
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}
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exports.instantiateStreaming = instantiateStreaming;
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/** Demangles an AssemblyScript module's exports to a friendly object structure. */
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function demangle(exports, extendedExports = {}) {
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extendedExports = Object.create(extendedExports);
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const setArgumentsLength = exports["__argumentsLength"]
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? length => { exports["__argumentsLength"].value = length; }
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: exports["__setArgumentsLength"] || exports["__setargc"] || (() => { /* nop */ });
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for (let internalName in exports) {
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if (!Object.prototype.hasOwnProperty.call(exports, internalName)) continue;
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const elem = exports[internalName];
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let parts = internalName.split(".");
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let curr = extendedExports;
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while (parts.length > 1) {
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let part = parts.shift();
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if (!Object.prototype.hasOwnProperty.call(curr, part)) curr[part] = {};
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curr = curr[part];
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}
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let name = parts[0];
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let hash = name.indexOf("#");
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if (hash >= 0) {
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const className = name.substring(0, hash);
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const classElem = curr[className];
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if (typeof classElem === "undefined" || !classElem.prototype) {
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const ctor = function(...args) {
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return ctor.wrap(ctor.prototype.constructor(0, ...args));
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};
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ctor.prototype = {
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valueOf: function valueOf() {
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return this[THIS];
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}
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};
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ctor.wrap = function(thisValue) {
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return Object.create(ctor.prototype, { [THIS]: { value: thisValue, writable: false } });
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};
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if (classElem) Object.getOwnPropertyNames(classElem).forEach(name =>
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Object.defineProperty(ctor, name, Object.getOwnPropertyDescriptor(classElem, name))
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);
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curr[className] = ctor;
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}
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name = name.substring(hash + 1);
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curr = curr[className].prototype;
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if (/^(get|set):/.test(name)) {
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if (!Object.prototype.hasOwnProperty.call(curr, name = name.substring(4))) {
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let getter = exports[internalName.replace("set:", "get:")];
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let setter = exports[internalName.replace("get:", "set:")];
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Object.defineProperty(curr, name, {
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get: function() { return getter(this[THIS]); },
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set: function(value) { setter(this[THIS], value); },
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enumerable: true
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});
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}
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} else {
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if (name === 'constructor') {
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(curr[name] = (...args) => {
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setArgumentsLength(args.length);
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return elem(...args);
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}).original = elem;
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} else { // instance method
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(curr[name] = function(...args) { // !
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setArgumentsLength(args.length);
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return elem(this[THIS], ...args);
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}).original = elem;
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}
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}
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} else {
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if (/^(get|set):/.test(name)) {
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if (!Object.prototype.hasOwnProperty.call(curr, name = name.substring(4))) {
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Object.defineProperty(curr, name, {
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get: exports[internalName.replace("set:", "get:")],
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set: exports[internalName.replace("get:", "set:")],
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enumerable: true
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});
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}
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} else if (typeof elem === "function" && elem !== setArgumentsLength) {
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(curr[name] = (...args) => {
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setArgumentsLength(args.length);
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return elem(...args);
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}).original = elem;
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} else {
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curr[name] = elem;
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}
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}
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}
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return extendedExports;
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}
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exports.demangle = demangle;
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