mirror of
https://github.com/fluencelabs/assemblyscript
synced 2025-04-27 16:02:16 +00:00
369 lines
13 KiB
JavaScript
369 lines
13 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 SET = 1 << 2;
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const MAP = 1 << 3;
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const VAL_ALIGN = 1 << 5;
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const VAL_SIGNED = 1 << 10;
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const VAL_FLOAT = 1 << 11;
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const VAL_NULLABLE = 1 << 12;
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const VAL_MANAGED = 1 << 13;
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const KEY_ALIGN = 1 << 14;
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const KEY_SIGNED = 1 << 19;
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const KEY_FLOAT = 1 << 20;
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const KEY_NULLABLE = 1 << 21;
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const KEY_MANAGED = 1 << 22;
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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(U32, U16, ref) {
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var length = U32[(ref + SIZE_OFFSET) >>> 2] >>> 1;
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var offset = ref >>> 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 baseModule = {};
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function getString(memory, ref) {
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if (!memory) return "<yet unknown>";
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const buffer = memory.buffer;
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return getStringImpl(new Uint32Array(buffer), new Uint16Array(buffer), ref);
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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(mesg, file, line, colm) {
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const memory = baseModule.memory || env.memory; // prefer exported, otherwise try imported
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throw Error("abort: " + getString(memory, mesg) + " at " + getString(memory, file) + ":" + line + ":" + colm);
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}
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env.trace = env.trace || function trace(mesg, n) {
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const memory = baseModule.memory || env.memory;
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console.log("trace: " + getString(memory, mesg) + (n ? " " : "") + Array.prototype.slice.call(arguments, 2, 2 + n).join(", "));
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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 baseModule;
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}
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/** Prepares the final module once instantiation is complete. */
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function postInstantiate(baseModule, instance) {
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const rawExports = instance.exports;
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const memory = rawExports.memory;
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const table = rawExports.table;
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const alloc = rawExports["__alloc"];
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const retain = rawExports["__retain"];
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const rttiBase = rawExports["__rtti_base"] || ~0; // oob if not present
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// Provide views for all sorts of basic values
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var buffer, I8, U8, I16, U16, I32, U32, F32, F64, I64, U64;
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/** Updates memory views if memory has grown meanwhile. */
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function checkMem() {
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// see: https://github.com/WebAssembly/design/issues/1210
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if (buffer !== memory.buffer) {
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buffer = memory.buffer;
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I8 = new Int8Array(buffer);
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U8 = new Uint8Array(buffer);
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I16 = new Int16Array(buffer);
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U16 = new Uint16Array(buffer);
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I32 = new Int32Array(buffer);
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U32 = new Uint32Array(buffer);
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if (BIGINT) {
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I64 = new BigInt64Array(buffer);
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U64 = new BigUint64Array(buffer);
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}
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F32 = new Float32Array(buffer);
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F64 = new Float64Array(buffer);
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}
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}
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checkMem();
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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 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 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 or keys. */
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function getAlign(which, info) {
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return 31 - Math.clz32((info / which) & 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 ref = alloc(length << 1, STRING_ID);
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checkMem();
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for (let i = 0, j = ref >>> 1; i < length; ++i) U16[j + i] = str.charCodeAt(i);
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return ref;
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}
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baseModule.__allocString = __allocString;
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/** Reads a string from the module's memory by its pointer. */
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function __getString(ref) {
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checkMem();
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const id = U32[ref + ID_OFFSET >>> 2];
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if (id !== STRING_ID) throw Error("not a string: " + ref);
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return getStringImpl(U32, U16, ref);
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}
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baseModule.__getString = __getString;
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/** Gets the view matching the specified alignment, signedness and floatness. */
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function getView(align, signed, float) {
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if (float) {
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switch (align) {
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case 2: return F32;
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case 3: return F64;
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}
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} else {
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switch (align) {
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case 0: return signed ? I8 : U8;
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case 1: return signed ? I16 : U16;
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case 2: return signed ? I32 : U32;
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case 3: return signed ? I64 : U64;
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}
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}
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throw Error("unsupported align: " + align);
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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))) throw Error("not an array: " + id + " @ " + info);
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const align = getAlign(VAL_ALIGN, info);
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const length = values.length;
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const buf = alloc(length << align, ARRAYBUFFER_ID);
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const arr = alloc(info & ARRAY ? ARRAY_SIZE : ARRAYBUFFERVIEW_SIZE, id);
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checkMem();
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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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const view = getView(align, info & VAL_SIGNED, info & VAL_FLOAT);
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for (let i = 0; i < length; ++i) view[(buf >> align) + i] = values[i];
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if (info & VAL_MANAGED) for (let i = 0; i < length; ++i) retain(values[i]);
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return arr;
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}
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baseModule.__allocArray = __allocArray;
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/** Gets a view on the values of an array in the module's memory. */
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function __getArrayView(arr) {
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checkMem();
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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)) throw Error("not an array: " + id);
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const align = getAlign(VAL_ALIGN, info);
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var buf = 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)
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.slice(buf >>>= align, buf + length);
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}
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baseModule.__getArrayView = __getArrayView;
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/** Reads (copies) the values of an array from the module's memory. */
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function __getArray(arr) {
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return Array.from(__getArrayView(arr));
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}
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baseModule.__getArray = __getArray;
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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(ref, baseId) {
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var id = U32[(ref + ID_OFFSET) >>> 2];
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if (id <= U32[rttiBase >>> 2]) {
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do if (id == baseId) return true;
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while (id = getBase(id));
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}
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return false;
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}
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baseModule.__instanceof = __instanceof;
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// Pull basic exports to baseModule so code in preInstantiate can use them
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baseModule.memory = baseModule.memory || memory;
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baseModule.table = baseModule.table || table;
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// Demangle exports and provide the usual utility on the prototype
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return demangle(rawExports, Object.defineProperties(baseModule, {
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I8: { get: function() { checkMem(); return I8; } },
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U8: { get: function() { checkMem(); return U8; } },
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I16: { get: function() { checkMem(); return I16; } },
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U16: { get: function() { checkMem(); return U16; } },
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I32: { get: function() { checkMem(); return I32; } },
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U32: { get: function() { checkMem(); return U32; } },
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I64: { get: function() { checkMem(); return I64; } },
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U64: { get: function() { checkMem(); return U64; } },
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F32: { get: function() { checkMem(); return F32; } },
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F64: { get: function() { checkMem(); return F64; } }
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}));
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}
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/** Wraps a WebAssembly function while also taking care of variable arguments. */
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function wrapFunction(fn, setargc) {
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var wrap = (...args) => {
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setargc(args.length);
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return fn(...args);
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}
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wrap.original = fn;
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return wrap;
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}
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/** Instantiates an AssemblyScript module using the specified imports. */
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function instantiate(module, imports) {
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return postInstantiate(
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preInstantiate(imports || (imports = {})),
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new WebAssembly.Instance(module, imports)
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);
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}
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exports.instantiate = instantiate;
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/** Instantiates an AssemblyScript module from a buffer using the specified imports. */
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function instantiateBuffer(buffer, imports) {
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return instantiate(new WebAssembly.Module(buffer), imports);
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}
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exports.instantiateBuffer = instantiateBuffer;
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/** Instantiates an AssemblyScript module from a response using the specified imports. */
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async function instantiateStreaming(response, imports) {
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return postInstantiate(
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preInstantiate(imports || (imports = {})),
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(await WebAssembly.instantiateStreaming(response, imports)).instance
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);
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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, baseModule) {
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var module = baseModule ? Object.create(baseModule) : {};
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var setargc = exports["__setargc"] || function() {};
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function hasOwnProperty(elem, prop) {
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return Object.prototype.hasOwnProperty.call(elem, prop);
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}
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for (let internalName in exports) {
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if (!hasOwnProperty(exports, internalName)) continue;
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let elem = exports[internalName];
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let parts = internalName.split(".");
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let curr = module;
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while (parts.length > 1) {
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let part = parts.shift();
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if (!hasOwnProperty(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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let className = name.substring(0, hash);
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let classElem = curr[className];
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if (typeof classElem === "undefined" || !classElem.prototype) {
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let 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 (!hasOwnProperty(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] = wrapFunction(elem, setargc);
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} else { // for methods
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Object.defineProperty(curr, name, {
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value: function (...args) {
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setargc(args.length);
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return elem(this[THIS], ...args);
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}
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});
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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 (!hasOwnProperty(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") {
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curr[name] = wrapFunction(elem, setargc);
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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 module;
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}
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exports.demangle = demangle;
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