4084185b3c
`memory.init` copies bytes from a passive data segment to linear memory. `memory.drop` is an instruction that informs the wasm VM that the instance no longer needs access to the passive data segment. Information about the passive data segments, including their contents, length, and whether they are dropped, is stored in the `WasmInstanceObject` as primitive arrays. Bug: v8:7747 Change-Id: I1515c8868c9be227743456a539126c15280b5365 Reviewed-on: https://chromium-review.googlesource.com/c/1370691 Reviewed-by: Clemens Hammacher <clemensh@chromium.org> Commit-Queue: Ben Smith <binji@chromium.org> Cr-Commit-Position: refs/heads/master@{#58196}
747 lines
23 KiB
JavaScript
747 lines
23 KiB
JavaScript
// Copyright 2016 the V8 project authors. All rights reserved.
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// Use of this source code is governed by a BSD-style license that can be
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// found in the LICENSE file.
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// Used for encoding f32 and double constants to bits.
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let __buffer = new ArrayBuffer(8);
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let byte_view = new Int8Array(__buffer);
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let f32_view = new Float32Array(__buffer);
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let f64_view = new Float64Array(__buffer);
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class Binary extends Array {
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emit_u8(val) {
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this.push(val);
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}
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emit_u16(val) {
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this.push(val & 0xff);
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this.push((val >> 8) & 0xff);
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}
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emit_u32(val) {
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this.push(val & 0xff);
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this.push((val >> 8) & 0xff);
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this.push((val >> 16) & 0xff);
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this.push((val >> 24) & 0xff);
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}
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emit_u32v(val) {
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while (true) {
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let v = val & 0xff;
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val = val >>> 7;
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if (val == 0) {
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this.push(v);
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break;
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}
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this.push(v | 0x80);
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}
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}
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emit_bytes(data) {
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for (let i = 0; i < data.length; i++) {
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this.push(data[i] & 0xff);
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}
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}
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emit_string(string) {
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// When testing illegal names, we pass a byte array directly.
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if (string instanceof Array) {
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this.emit_u32v(string.length);
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this.emit_bytes(string);
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return;
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}
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// This is the hacky way to convert a JavaScript string to a UTF8 encoded
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// string only containing single-byte characters.
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let string_utf8 = unescape(encodeURIComponent(string));
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this.emit_u32v(string_utf8.length);
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for (let i = 0; i < string_utf8.length; i++) {
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this.emit_u8(string_utf8.charCodeAt(i));
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}
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}
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emit_header() {
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this.push(kWasmH0, kWasmH1, kWasmH2, kWasmH3,
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kWasmV0, kWasmV1, kWasmV2, kWasmV3);
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}
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emit_section(section_code, content_generator) {
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// Emit section name.
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this.emit_u8(section_code);
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// Emit the section to a temporary buffer: its full length isn't know yet.
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const section = new Binary;
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content_generator(section);
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// Emit section length.
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this.emit_u32v(section.length);
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// Copy the temporary buffer.
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// Avoid spread because {section} can be huge.
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for (let b of section) this.push(b);
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}
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}
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class WasmFunctionBuilder {
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constructor(module, name, type_index) {
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this.module = module;
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this.name = name;
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this.type_index = type_index;
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this.body = [];
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this.locals = [];
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this.local_names = [];
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}
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numLocalNames() {
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let num_local_names = 0;
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for (let loc_name of this.local_names) {
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if (loc_name !== undefined) ++num_local_names;
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}
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return num_local_names;
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}
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exportAs(name) {
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this.module.addExport(name, this.index);
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return this;
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}
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exportFunc() {
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this.exportAs(this.name);
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return this;
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}
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addBody(body) {
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for (let b of body) {
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if (typeof b !== 'number' || (b & (~0xFF)) !== 0 )
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throw new Error('invalid body (entries must be 8 bit numbers): ' + body);
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}
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this.body = body.slice();
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// Automatically add the end for the function block to the body.
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this.body.push(kExprEnd);
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return this;
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}
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addBodyWithEnd(body) {
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this.body = body;
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return this;
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}
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getNumLocals() {
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let total_locals = 0;
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for (let l of this.locals) {
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for (let type of ["i32", "i64", "f32", "f64", "s128"]) {
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total_locals += l[type + "_count"] || 0;
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}
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}
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return total_locals;
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}
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addLocals(locals, names) {
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const old_num_locals = this.getNumLocals();
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this.locals.push(locals);
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if (names) {
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const missing_names = old_num_locals - this.local_names.length;
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this.local_names.push(...new Array(missing_names), ...names);
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}
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return this;
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}
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end() {
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return this.module;
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}
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}
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class WasmGlobalBuilder {
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constructor(module, type, mutable) {
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this.module = module;
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this.type = type;
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this.mutable = mutable;
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this.init = 0;
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}
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exportAs(name) {
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this.module.exports.push({name: name, kind: kExternalGlobal,
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index: this.index});
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return this;
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}
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}
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class WasmModuleBuilder {
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constructor() {
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this.types = [];
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this.imports = [];
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this.exports = [];
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this.globals = [];
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this.exceptions = [];
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this.functions = [];
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this.table_length_min = 0;
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this.table_length_max = undefined;
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this.element_segments = [];
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this.data_segments = [];
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this.explicit = [];
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this.num_imported_funcs = 0;
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this.num_imported_globals = 0;
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this.num_imported_exceptions = 0;
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return this;
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}
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addStart(start_index) {
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this.start_index = start_index;
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return this;
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}
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addMemory(min, max, exp, shared) {
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this.memory = {min: min, max: max, exp: exp, shared: shared};
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return this;
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}
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addExplicitSection(bytes) {
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this.explicit.push(bytes);
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return this;
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}
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stringToBytes(name) {
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var result = new Binary();
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result.emit_u32v(name.length);
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for (var i = 0; i < name.length; i++) {
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result.emit_u8(name.charCodeAt(i));
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}
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return result;
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}
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addCustomSection(name, bytes) {
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name = this.stringToBytes(name);
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var length = new Binary();
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length.emit_u32v(name.length + bytes.length);
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var section = [0, ...length, ...name];
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// Avoid spread because {bytes} can be huge.
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for (var b of bytes) section.push(b);
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this.explicit.push(section);
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}
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addType(type) {
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this.types.push(type);
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var pl = type.params.length; // should have params
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var rl = type.results.length; // should have results
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return this.types.length - 1;
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}
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addGlobal(local_type, mutable) {
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let glob = new WasmGlobalBuilder(this, local_type, mutable);
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glob.index = this.globals.length + this.num_imported_globals;
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this.globals.push(glob);
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return glob;
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}
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addException(type) {
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let type_index = (typeof type) == "number" ? type : this.addType(type);
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let except_index = this.exceptions.length + this.num_imported_exceptions;
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this.exceptions.push(type_index);
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return except_index;
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}
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addFunction(name, type) {
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let type_index = (typeof type) == "number" ? type : this.addType(type);
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let func = new WasmFunctionBuilder(this, name, type_index);
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func.index = this.functions.length + this.num_imported_funcs;
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this.functions.push(func);
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return func;
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}
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addImport(module, name, type) {
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if (this.functions.length != 0) {
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throw new Error('Imported functions must be declared before local ones');
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}
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let type_index = (typeof type) == "number" ? type : this.addType(type);
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this.imports.push({module: module, name: name, kind: kExternalFunction,
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type: type_index});
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return this.num_imported_funcs++;
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}
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addImportedGlobal(module, name, type, mutable = false) {
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if (this.globals.length != 0) {
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throw new Error('Imported globals must be declared before local ones');
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}
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let o = {module: module, name: name, kind: kExternalGlobal, type: type,
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mutable: mutable};
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this.imports.push(o);
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return this.num_imported_globals++;
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}
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addImportedMemory(module, name, initial = 0, maximum, shared) {
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let o = {module: module, name: name, kind: kExternalMemory,
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initial: initial, maximum: maximum, shared: shared};
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this.imports.push(o);
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return this;
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}
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addImportedTable(module, name, initial, maximum) {
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let o = {module: module, name: name, kind: kExternalTable, initial: initial,
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maximum: maximum};
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this.imports.push(o);
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}
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addImportedException(module, name, type) {
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if (this.exceptions.length != 0) {
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throw new Error('Imported exceptions must be declared before local ones');
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}
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let type_index = (typeof type) == "number" ? type : this.addType(type);
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let o = {module: module, name: name, kind: kExternalException, type: type_index};
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this.imports.push(o);
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return this.num_imported_exceptions++;
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}
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addExport(name, index) {
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this.exports.push({name: name, kind: kExternalFunction, index: index});
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return this;
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}
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addExportOfKind(name, kind, index) {
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this.exports.push({name: name, kind: kind, index: index});
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return this;
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}
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addDataSegment(addr, data, is_global = false) {
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this.data_segments.push(
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{addr: addr, data: data, is_global: is_global, is_active: true});
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return this.data_segments.length - 1;
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}
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addPassiveDataSegment(data) {
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this.data_segments.push({data: data, is_active: false});
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return this.data_segments.length - 1;
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}
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exportMemoryAs(name) {
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this.exports.push({name: name, kind: kExternalMemory, index: 0});
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}
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addElementSegment(base, is_global, array, is_import = false) {
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this.element_segments.push({base: base, is_global: is_global,
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array: array, is_active: true});
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if (!is_global) {
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var length = base + array.length;
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if (length > this.table_length_min && !is_import) {
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this.table_length_min = length;
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}
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if (length > this.table_length_max && !is_import) {
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this.table_length_max = length;
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}
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}
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return this;
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}
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addPassiveElementSegment(array, is_import = false) {
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this.element_segments.push({array: array, is_active: false});
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return this;
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}
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appendToTable(array) {
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for (let n of array) {
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if (typeof n != 'number')
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throw new Error('invalid table (entries have to be numbers): ' + array);
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}
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return this.addElementSegment(this.table_length_min, false, array);
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}
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setTableBounds(min, max = undefined) {
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this.table_length_min = min;
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this.table_length_max = max;
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return this;
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}
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setName(name) {
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this.name = name;
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return this;
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}
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toArray(debug = false) {
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let binary = new Binary;
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let wasm = this;
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// Add header
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binary.emit_header();
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// Add type section
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if (wasm.types.length > 0) {
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if (debug) print("emitting types @ " + binary.length);
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binary.emit_section(kTypeSectionCode, section => {
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section.emit_u32v(wasm.types.length);
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for (let type of wasm.types) {
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section.emit_u8(kWasmFunctionTypeForm);
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section.emit_u32v(type.params.length);
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for (let param of type.params) {
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section.emit_u8(param);
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}
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section.emit_u32v(type.results.length);
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for (let result of type.results) {
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section.emit_u8(result);
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}
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}
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});
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}
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// Add imports section
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if (wasm.imports.length > 0) {
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if (debug) print("emitting imports @ " + binary.length);
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binary.emit_section(kImportSectionCode, section => {
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section.emit_u32v(wasm.imports.length);
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for (let imp of wasm.imports) {
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section.emit_string(imp.module);
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section.emit_string(imp.name || '');
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section.emit_u8(imp.kind);
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if (imp.kind == kExternalFunction) {
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section.emit_u32v(imp.type);
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} else if (imp.kind == kExternalGlobal) {
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section.emit_u32v(imp.type);
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section.emit_u8(imp.mutable);
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} else if (imp.kind == kExternalMemory) {
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var has_max = (typeof imp.maximum) != "undefined";
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var is_shared = (typeof imp.shared) != "undefined";
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if (is_shared) {
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section.emit_u8(has_max ? 3 : 2); // flags
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} else {
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section.emit_u8(has_max ? 1 : 0); // flags
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}
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section.emit_u32v(imp.initial); // initial
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if (has_max) section.emit_u32v(imp.maximum); // maximum
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} else if (imp.kind == kExternalTable) {
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section.emit_u8(kWasmAnyFunctionTypeForm);
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var has_max = (typeof imp.maximum) != "undefined";
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section.emit_u8(has_max ? 1 : 0); // flags
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section.emit_u32v(imp.initial); // initial
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if (has_max) section.emit_u32v(imp.maximum); // maximum
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} else if (imp.kind == kExternalException) {
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section.emit_u32v(kExceptionAttribute);
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section.emit_u32v(imp.type);
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} else {
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throw new Error("unknown/unsupported import kind " + imp.kind);
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}
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}
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});
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}
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// Add functions declarations
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if (wasm.functions.length > 0) {
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if (debug) print("emitting function decls @ " + binary.length);
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binary.emit_section(kFunctionSectionCode, section => {
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section.emit_u32v(wasm.functions.length);
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for (let func of wasm.functions) {
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section.emit_u32v(func.type_index);
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}
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});
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}
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// Add table section
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if (wasm.table_length_min > 0) {
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if (debug) print("emitting table @ " + binary.length);
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binary.emit_section(kTableSectionCode, section => {
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section.emit_u8(1); // one table entry
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section.emit_u8(kWasmAnyFunctionTypeForm);
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const max = wasm.table_length_max;
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const has_max = max !== undefined;
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section.emit_u8(has_max ? kHasMaximumFlag : 0);
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section.emit_u32v(wasm.table_length_min);
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if (has_max) section.emit_u32v(max);
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});
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}
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|
// Add memory section
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|
if (wasm.memory !== undefined) {
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if (debug) print("emitting memory @ " + binary.length);
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binary.emit_section(kMemorySectionCode, section => {
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section.emit_u8(1); // one memory entry
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const has_max = wasm.memory.max !== undefined;
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const is_shared = wasm.memory.shared !== undefined;
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|
// Emit flags (bit 0: reszeable max, bit 1: shared memory)
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|
if (is_shared) {
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section.emit_u8(has_max ? 3 : 2);
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} else {
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section.emit_u8(has_max ? 1 : 0);
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}
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section.emit_u32v(wasm.memory.min);
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|
if (has_max) section.emit_u32v(wasm.memory.max);
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});
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}
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|
|
|
// Add global section.
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|
if (wasm.globals.length > 0) {
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|
if (debug) print ("emitting globals @ " + binary.length);
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binary.emit_section(kGlobalSectionCode, section => {
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section.emit_u32v(wasm.globals.length);
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|
for (let global of wasm.globals) {
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section.emit_u8(global.type);
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section.emit_u8(global.mutable);
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|
if ((typeof global.init_index) == "undefined") {
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|
// Emit a constant initializer.
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|
switch (global.type) {
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|
case kWasmI32:
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section.emit_u8(kExprI32Const);
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section.emit_u32v(global.init);
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break;
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case kWasmI64:
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section.emit_u8(kExprI64Const);
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section.emit_u32v(global.init);
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break;
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case kWasmF32:
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section.emit_u8(kExprF32Const);
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f32_view[0] = global.init;
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section.emit_u8(byte_view[0]);
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section.emit_u8(byte_view[1]);
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section.emit_u8(byte_view[2]);
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section.emit_u8(byte_view[3]);
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break;
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case kWasmF64:
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section.emit_u8(kExprF64Const);
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f64_view[0] = global.init;
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section.emit_u8(byte_view[0]);
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|
section.emit_u8(byte_view[1]);
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section.emit_u8(byte_view[2]);
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section.emit_u8(byte_view[3]);
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|
section.emit_u8(byte_view[4]);
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section.emit_u8(byte_view[5]);
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section.emit_u8(byte_view[6]);
|
|
section.emit_u8(byte_view[7]);
|
|
break;
|
|
}
|
|
} else {
|
|
// Emit a global-index initializer.
|
|
section.emit_u8(kExprGetGlobal);
|
|
section.emit_u32v(global.init_index);
|
|
}
|
|
section.emit_u8(kExprEnd); // end of init expression
|
|
}
|
|
});
|
|
}
|
|
|
|
// Add exceptions.
|
|
if (wasm.exceptions.length > 0) {
|
|
if (debug) print("emitting exceptions @ " + binary.length);
|
|
binary.emit_section(kExceptionSectionCode, section => {
|
|
section.emit_u32v(wasm.exceptions.length);
|
|
for (let type of wasm.exceptions) {
|
|
section.emit_u32v(kExceptionAttribute);
|
|
section.emit_u32v(type);
|
|
}
|
|
});
|
|
}
|
|
|
|
// Add export table.
|
|
var mem_export = (wasm.memory !== undefined && wasm.memory.exp);
|
|
var exports_count = wasm.exports.length + (mem_export ? 1 : 0);
|
|
if (exports_count > 0) {
|
|
if (debug) print("emitting exports @ " + binary.length);
|
|
binary.emit_section(kExportSectionCode, section => {
|
|
section.emit_u32v(exports_count);
|
|
for (let exp of wasm.exports) {
|
|
section.emit_string(exp.name);
|
|
section.emit_u8(exp.kind);
|
|
section.emit_u32v(exp.index);
|
|
}
|
|
if (mem_export) {
|
|
section.emit_string("memory");
|
|
section.emit_u8(kExternalMemory);
|
|
section.emit_u8(0);
|
|
}
|
|
});
|
|
}
|
|
|
|
// Add start function section.
|
|
if (wasm.start_index !== undefined) {
|
|
if (debug) print("emitting start function @ " + binary.length);
|
|
binary.emit_section(kStartSectionCode, section => {
|
|
section.emit_u32v(wasm.start_index);
|
|
});
|
|
}
|
|
|
|
// Add element segments
|
|
if (wasm.element_segments.length > 0) {
|
|
if (debug) print("emitting element segments @ " + binary.length);
|
|
binary.emit_section(kElementSectionCode, section => {
|
|
var inits = wasm.element_segments;
|
|
section.emit_u32v(inits.length);
|
|
|
|
for (let init of inits) {
|
|
if (init.is_active) {
|
|
section.emit_u8(0); // table index / flags
|
|
if (init.is_global) {
|
|
section.emit_u8(kExprGetGlobal);
|
|
} else {
|
|
section.emit_u8(kExprI32Const);
|
|
}
|
|
section.emit_u32v(init.base);
|
|
section.emit_u8(kExprEnd);
|
|
} else {
|
|
section.emit_u8(kPassive); // flags
|
|
}
|
|
section.emit_u32v(init.array.length);
|
|
for (let index of init.array) {
|
|
section.emit_u32v(index);
|
|
}
|
|
}
|
|
});
|
|
}
|
|
|
|
// If there are any passive data segments, add the DataCount section.
|
|
if (wasm.data_segments.some(seg => !seg.is_active)) {
|
|
binary.emit_section(kDataCountSectionCode, section => {
|
|
section.emit_u32v(wasm.data_segments.length);
|
|
});
|
|
}
|
|
|
|
// Add function bodies.
|
|
if (wasm.functions.length > 0) {
|
|
// emit function bodies
|
|
if (debug) print("emitting code @ " + binary.length);
|
|
binary.emit_section(kCodeSectionCode, section => {
|
|
section.emit_u32v(wasm.functions.length);
|
|
for (let func of wasm.functions) {
|
|
// Function body length will be patched later.
|
|
let local_decls = [];
|
|
for (let l of func.locals || []) {
|
|
if (l.i32_count > 0) {
|
|
local_decls.push({count: l.i32_count, type: kWasmI32});
|
|
}
|
|
if (l.i64_count > 0) {
|
|
local_decls.push({count: l.i64_count, type: kWasmI64});
|
|
}
|
|
if (l.f32_count > 0) {
|
|
local_decls.push({count: l.f32_count, type: kWasmF32});
|
|
}
|
|
if (l.f64_count > 0) {
|
|
local_decls.push({count: l.f64_count, type: kWasmF64});
|
|
}
|
|
if (l.s128_count > 0) {
|
|
local_decls.push({count: l.s128_count, type: kWasmS128});
|
|
}
|
|
if (l.anyref_count > 0) {
|
|
local_decls.push({count: l.anyref_count, type: kWasmAnyRef});
|
|
}
|
|
if (l.except_count > 0) {
|
|
local_decls.push({count: l.except_count, type: kWasmExceptRef});
|
|
}
|
|
}
|
|
|
|
let header = new Binary;
|
|
header.emit_u32v(local_decls.length);
|
|
for (let decl of local_decls) {
|
|
header.emit_u32v(decl.count);
|
|
header.emit_u8(decl.type);
|
|
}
|
|
|
|
section.emit_u32v(header.length + func.body.length);
|
|
section.emit_bytes(header);
|
|
section.emit_bytes(func.body);
|
|
}
|
|
});
|
|
}
|
|
|
|
// Add data segments.
|
|
if (wasm.data_segments.length > 0) {
|
|
if (debug) print("emitting data segments @ " + binary.length);
|
|
binary.emit_section(kDataSectionCode, section => {
|
|
section.emit_u32v(wasm.data_segments.length);
|
|
for (let seg of wasm.data_segments) {
|
|
if (seg.is_active) {
|
|
section.emit_u8(0); // linear memory index 0 / flags
|
|
if (seg.is_global) {
|
|
// initializer is a global variable
|
|
section.emit_u8(kExprGetGlobal);
|
|
section.emit_u32v(seg.addr);
|
|
} else {
|
|
// initializer is a constant
|
|
section.emit_u8(kExprI32Const);
|
|
section.emit_u32v(seg.addr);
|
|
}
|
|
section.emit_u8(kExprEnd);
|
|
} else {
|
|
section.emit_u8(kPassive); // flags
|
|
}
|
|
section.emit_u32v(seg.data.length);
|
|
section.emit_bytes(seg.data);
|
|
}
|
|
});
|
|
}
|
|
|
|
// Add any explicitly added sections
|
|
for (let exp of wasm.explicit) {
|
|
if (debug) print("emitting explicit @ " + binary.length);
|
|
binary.emit_bytes(exp);
|
|
}
|
|
|
|
// Add names.
|
|
let num_function_names = 0;
|
|
let num_functions_with_local_names = 0;
|
|
for (let func of wasm.functions) {
|
|
if (func.name !== undefined) ++num_function_names;
|
|
if (func.numLocalNames() > 0) ++num_functions_with_local_names;
|
|
}
|
|
if (num_function_names > 0 || num_functions_with_local_names > 0 ||
|
|
wasm.name !== undefined) {
|
|
if (debug) print('emitting names @ ' + binary.length);
|
|
binary.emit_section(kUnknownSectionCode, section => {
|
|
section.emit_string('name');
|
|
// Emit module name.
|
|
if (wasm.name !== undefined) {
|
|
section.emit_section(kModuleNameCode, name_section => {
|
|
name_section.emit_string(wasm.name);
|
|
});
|
|
}
|
|
// Emit function names.
|
|
if (num_function_names > 0) {
|
|
section.emit_section(kFunctionNamesCode, name_section => {
|
|
name_section.emit_u32v(num_function_names);
|
|
for (let func of wasm.functions) {
|
|
if (func.name === undefined) continue;
|
|
name_section.emit_u32v(func.index);
|
|
name_section.emit_string(func.name);
|
|
}
|
|
});
|
|
}
|
|
// Emit local names.
|
|
if (num_functions_with_local_names > 0) {
|
|
section.emit_section(kLocalNamesCode, name_section => {
|
|
name_section.emit_u32v(num_functions_with_local_names);
|
|
for (let func of wasm.functions) {
|
|
if (func.numLocalNames() == 0) continue;
|
|
name_section.emit_u32v(func.index);
|
|
name_section.emit_u32v(func.numLocalNames());
|
|
for (let i = 0; i < func.local_names.length; ++i) {
|
|
if (func.local_names[i] === undefined) continue;
|
|
name_section.emit_u32v(i);
|
|
name_section.emit_string(func.local_names[i]);
|
|
}
|
|
}
|
|
});
|
|
}
|
|
});
|
|
}
|
|
|
|
return binary;
|
|
}
|
|
|
|
toBuffer(debug = false) {
|
|
let bytes = this.toArray(debug);
|
|
let buffer = new ArrayBuffer(bytes.length);
|
|
let view = new Uint8Array(buffer);
|
|
for (let i = 0; i < bytes.length; i++) {
|
|
let val = bytes[i];
|
|
if ((typeof val) == "string") val = val.charCodeAt(0);
|
|
view[i] = val | 0;
|
|
}
|
|
return buffer;
|
|
}
|
|
|
|
instantiate(ffi) {
|
|
let module = new WebAssembly.Module(this.toBuffer());
|
|
let instance = new WebAssembly.Instance(module, ffi);
|
|
return instance;
|
|
}
|
|
|
|
asyncInstantiate(ffi) {
|
|
return WebAssembly.instantiate(this.toBuffer(), ffi)
|
|
.then(({module, instance}) => instance);
|
|
}
|
|
|
|
toModule(debug = false) {
|
|
return new WebAssembly.Module(this.toBuffer(debug));
|
|
}
|
|
}
|