| /* |
| * Copyright (C) 2016 Apple Inc. All rights reserved. |
| * |
| * Redistribution and use in source and binary forms, with or without |
| * modification, are permitted provided that the following conditions |
| * are met: |
| * 1. Redistributions of source code must retain the above copyright |
| * notice, this list of conditions and the following disclaimer. |
| * 2. Redistributions in binary form must reproduce the above copyright |
| * notice, this list of conditions and the following disclaimer in the |
| * documentation and/or other materials provided with the distribution. |
| * |
| * THIS SOFTWARE IS PROVIDED BY APPLE INC. ``AS IS'' AND ANY |
| * EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE |
| * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR |
| * PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL APPLE INC. OR |
| * CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, |
| * EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, |
| * PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR |
| * PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY |
| * OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT |
| * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE |
| * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. |
| */ |
| |
| import * as assert from 'assert.js'; |
| import * as BuildWebAssembly from 'Builder_WebAssemblyBinary.js'; |
| import * as LLB from 'LowLevelBinary.js'; |
| import * as WASM from 'WASM.js'; |
| import * as util from 'utilities.js'; |
| |
| const _isValidValue = (value, type) => { |
| switch (type) { |
| // We allow both signed and unsigned numbers. |
| case "i32": return Math.round(value) === value && LLB.varint32Min <= value && value <= LLB.varuint32Max; |
| case "i64": return true; // FIXME https://bugs.webkit.org/show_bug.cgi?id=163420 64-bit values |
| case "f32": return typeof(value) === "number" && isFinite(value); |
| case "f64": return typeof(value) === "number" && isFinite(value); |
| default: throw new Error(`Implementation problem: unknown type ${type}`); |
| } |
| }; |
| const _unknownSectionId = 0; |
| |
| const _normalizeFunctionSignature = (params, ret) => { |
| assert.isArray(params); |
| for (const p of params) |
| assert.truthy(WASM.isValidValueType(p) || p === "void", `Type parameter ${p} needs a valid value type`); |
| if (typeof(ret) === "undefined") |
| ret = "void"; |
| assert.isNotArray(ret, `Multiple return values not supported by WebAssembly yet`); |
| assert.truthy(WASM.isValidBlockType(ret), `Type return ${ret} must be valid block type`); |
| return [params, ret]; |
| }; |
| |
| const _errorHandlingProxyFor = builder => builder["__isProxy"] ? builder : new Proxy(builder, { |
| get: (target, property, receiver) => { |
| if (property === "__isProxy") |
| return true; |
| if (target[property] === undefined) |
| throw new Error(`WebAssembly builder received unknown property '${property}'`); |
| return target[property]; |
| } |
| }); |
| |
| const _maybeRegisterType = (builder, type) => { |
| const typeSection = builder._getSection("Type"); |
| if (typeof(type) === "number") { |
| // Type numbers already refer to the type section, no need to register them. |
| if (builder._checked) { |
| assert.isNotUndef(typeSection, `Can not use type ${type} if a type section is not present`); |
| assert.isNotUndef(typeSection.data[type], `Type ${type} does not exist in type section`); |
| } |
| return type; |
| } |
| assert.hasObjectProperty(type, "params", `Expected type to be a number or object with 'params' and optionally 'ret' fields`); |
| const [params, ret] = _normalizeFunctionSignature(type.params, type.ret); |
| assert.isNotUndef(typeSection, `Can not add type if a type section is not present`); |
| // Try reusing an equivalent type from the type section. |
| types: |
| for (let i = 0; i !== typeSection.data.length; ++i) { |
| const t = typeSection.data[i]; |
| if (t.ret === ret && params.length === t.params.length) { |
| for (let j = 0; j !== t.params.length; ++j) { |
| if (params[j] !== t.params[j]) |
| continue types; |
| } |
| type = i; |
| break; |
| } |
| } |
| if (typeof(type) !== "number") { |
| // Couldn't reuse a pre-existing type, register this type in the type section. |
| typeSection.data.push({ params: params, ret: ret }); |
| type = typeSection.data.length - 1; |
| } |
| return type; |
| }; |
| |
| const _importFunctionContinuation = (builder, section, nextBuilder) => { |
| return (module, field, type) => { |
| assert.isString(module, `Import function module should be a string, got "${module}"`); |
| assert.isString(field, `Import function field should be a string, got "${field}"`); |
| const typeSection = builder._getSection("Type"); |
| type = _maybeRegisterType(builder, type); |
| section.data.push({ field: field, type: type, kind: "Function", module: module }); |
| // Imports also count in the function index space. Map them as objects to avoid clashing with Code functions' names. |
| builder._registerFunctionToIndexSpace({ module: module, field: field }); |
| return _errorHandlingProxyFor(nextBuilder); |
| }; |
| }; |
| |
| const _importMemoryContinuation = (builder, section, nextBuilder) => { |
| return (module, field, {initial, maximum}) => { |
| assert.isString(module, `Import Memory module should be a string, got "${module}"`); |
| assert.isString(field, `Import Memory field should be a string, got "${field}"`); |
| section.data.push({module, field, kind: "Memory", memoryDescription: {initial, maximum}}); |
| return _errorHandlingProxyFor(nextBuilder); |
| }; |
| }; |
| |
| const _importTableContinuation = (builder, section, nextBuilder) => { |
| return (module, field, {initial, maximum, element}) => { |
| assert.isString(module, `Import Table module should be a string, got "${module}"`); |
| assert.isString(field, `Import Table field should be a string, got "${field}"`); |
| section.data.push({module, field, kind: "Table", tableDescription: {initial, maximum, element}}); |
| return _errorHandlingProxyFor(nextBuilder); |
| }; |
| }; |
| |
| const _exportFunctionContinuation = (builder, section, nextBuilder) => { |
| return (field, index, type) => { |
| assert.isString(field, `Export function field should be a string, got "${field}"`); |
| const typeSection = builder._getSection("Type"); |
| if (typeof(type) !== "undefined") { |
| // Exports can leave the type unspecified, letting the Code builder patch them up later. |
| type = _maybeRegisterType(builder, type); |
| } |
| |
| // We can't check much about "index" here because the Code section succeeds the Export section. More work is done at Code().End() time. |
| switch (typeof(index)) { |
| case "string": break; // Assume it's a function name which will be revealed in the Code section. |
| case "number": break; // Assume it's a number in the "function index space". |
| case "object": |
| // Re-exporting an import. |
| assert.hasObjectProperty(index, "module", `Re-exporting "${field}" from an import`); |
| assert.hasObjectProperty(index, "field", `Re-exporting "${field}" from an import`); |
| break; |
| case "undefined": |
| // Assume it's the same as the field (i.e. it's not being renamed). |
| index = field; |
| break; |
| default: throw new Error(`Export section's index must be a string or a number, got ${index}`); |
| } |
| |
| const correspondingImport = builder._getFunctionFromIndexSpace(index); |
| const importSection = builder._getSection("Import"); |
| if (typeof(index) === "object") { |
| // Re-exporting an import using its module+field name. |
| assert.isNotUndef(correspondingImport, `Re-exporting "${field}" couldn't find import from module "${index.module}" field "${index.field}"`); |
| index = correspondingImport; |
| if (typeof(type) === "undefined") |
| type = importSection.data[index].type; |
| if (builder._checked) |
| assert.eq(type, importSection.data[index].type, `Re-exporting import "${importSection.data[index].field}" as "${field}" has mismatching type`); |
| } else if (typeof(correspondingImport) !== "undefined") { |
| // Re-exporting an import using its index. |
| let exportedImport; |
| for (const i of importSection.data) { |
| if (i.module === correspondingImport.module && i.field === correspondingImport.field) { |
| exportedImport = i; |
| break; |
| } |
| } |
| if (typeof(type) === "undefined") |
| type = exportedImport.type; |
| if (builder._checked) |
| assert.eq(type, exportedImport.type, `Re-exporting import "${exportedImport.field}" as "${field}" has mismatching type`); |
| } |
| section.data.push({ field: field, type: type, kind: "Function", index: index }); |
| return _errorHandlingProxyFor(nextBuilder); |
| }; |
| }; |
| |
| const _normalizeMutability = (mutability) => { |
| if (mutability === "mutable") |
| return 1; |
| else if (mutability === "immutable") |
| return 0; |
| else |
| throw new Error(`mutability should be either "mutable" or "immutable", but got ${mutability}`); |
| }; |
| |
| const _exportGlobalContinuation = (builder, section, nextBuilder) => { |
| return (field, index) => { |
| assert.isNumber(index, `Global exports only support number indices right now`); |
| section.data.push({ field, kind: "Global", index }); |
| return _errorHandlingProxyFor(nextBuilder); |
| } |
| }; |
| |
| const _exportMemoryContinuation = (builder, section, nextBuilder) => { |
| return (field, index) => { |
| assert.isNumber(index, `Memory exports only support number indices`); |
| section.data.push({field, kind: "Memory", index}); |
| return _errorHandlingProxyFor(nextBuilder); |
| } |
| }; |
| |
| const _exportTableContinuation = (builder, section, nextBuilder) => { |
| return (field, index) => { |
| assert.isNumber(index, `Table exports only support number indices`); |
| section.data.push({field, kind: "Table", index}); |
| return _errorHandlingProxyFor(nextBuilder); |
| } |
| }; |
| |
| const _importGlobalContinuation = (builder, section, nextBuilder) => { |
| return () => { |
| const globalBuilder = { |
| End: () => nextBuilder |
| }; |
| for (let op of WASM.description.value_type) { |
| globalBuilder[util.toJavaScriptName(op)] = (module, field, mutability) => { |
| assert.isString(module, `Import global module should be a string, got "${module}"`); |
| assert.isString(field, `Import global field should be a string, got "${field}"`); |
| assert.isString(mutability, `Import global mutability should be a string, got "${mutability}"`); |
| section.data.push({ globalDescription: { type: op, mutability: _normalizeMutability(mutability) }, module, field, kind: "Global" }); |
| return _errorHandlingProxyFor(globalBuilder); |
| }; |
| } |
| return _errorHandlingProxyFor(globalBuilder); |
| }; |
| }; |
| |
| const _checkStackArgs = (op, param) => { |
| for (let expect of param) { |
| if (WASM.isValidType(expect)) { |
| // FIXME implement stack checks for arguments. https://bugs.webkit.org/show_bug.cgi?id=163421 |
| } else { |
| // Handle our own meta-types. |
| switch (expect) { |
| case "addr": break; // FIXME implement addr. https://bugs.webkit.org/show_bug.cgi?id=163421 |
| case "any": break; // FIXME implement any. https://bugs.webkit.org/show_bug.cgi?id=163421 |
| case "bool": break; // FIXME implement bool. https://bugs.webkit.org/show_bug.cgi?id=163421 |
| case "call": break; // FIXME implement call stack argument checks based on function signature. https://bugs.webkit.org/show_bug.cgi?id=163421 |
| case "global": break; // FIXME implement global. https://bugs.webkit.org/show_bug.cgi?id=163421 |
| case "local": break; // FIXME implement local. https://bugs.webkit.org/show_bug.cgi?id=163421 |
| case "prev": break; // FIXME implement prev, checking for whetever the previous value was. https://bugs.webkit.org/show_bug.cgi?id=163421 |
| case "size": break; // FIXME implement size. https://bugs.webkit.org/show_bug.cgi?id=163421 |
| default: throw new Error(`Implementation problem: unhandled meta-type "${expect}" on "${op}"`); |
| } |
| } |
| } |
| } |
| |
| const _checkStackReturn = (op, ret) => { |
| for (let expect of ret) { |
| if (WASM.isValidType(expect)) { |
| // FIXME implement stack checks for return. https://bugs.webkit.org/show_bug.cgi?id=163421 |
| } else { |
| // Handle our own meta-types. |
| switch (expect) { |
| case "any": break; |
| case "bool": break; // FIXME implement bool. https://bugs.webkit.org/show_bug.cgi?id=163421 |
| case "call": break; // FIXME implement call stack return check based on function signature. https://bugs.webkit.org/show_bug.cgi?id=163421 |
| case "control": break; // FIXME implement control. https://bugs.webkit.org/show_bug.cgi?id=163421 |
| case "global": break; // FIXME implement global. https://bugs.webkit.org/show_bug.cgi?id=163421 |
| case "local": break; // FIXME implement local. https://bugs.webkit.org/show_bug.cgi?id=163421 |
| case "prev": break; // FIXME implement prev, checking for whetever the parameter type was. https://bugs.webkit.org/show_bug.cgi?id=163421 |
| case "size": break; // FIXME implement size. https://bugs.webkit.org/show_bug.cgi?id=163421 |
| default: throw new Error(`Implementation problem: unhandled meta-type "${expect}" on "${op}"`); |
| } |
| } |
| } |
| }; |
| |
| const _checkImms = (op, imms, expectedImms, ret) => { |
| const minExpectedImms = expectedImms.filter(i => i.type.slice(-1) !== '*').length; |
| if (minExpectedImms !== expectedImms.length) |
| assert.ge(imms.length, minExpectedImms, `"${op}" expects at least ${minExpectedImms} immediate${minExpectedImms !== 1 ? 's' : ''}, got ${imms.length}`); |
| else |
| assert.eq(imms.length, minExpectedImms, `"${op}" expects exactly ${minExpectedImms} immediate${minExpectedImms !== 1 ? 's' : ''}, got ${imms.length}`); |
| for (let idx = 0; idx !== expectedImms.length; ++idx) { |
| const got = imms[idx]; |
| const expect = expectedImms[idx]; |
| switch (expect.name) { |
| case "function_index": |
| assert.truthy(_isValidValue(got, "i32") && got >= 0, `Invalid value on ${op}: got "${got}", expected non-negative i32`); |
| // FIXME check function indices. https://bugs.webkit.org/show_bug.cgi?id=163421 |
| break; |
| case "local_index": break; // improve checking https://bugs.webkit.org/show_bug.cgi?id=163421 |
| case "global_index": break; // improve checking https://bugs.webkit.org/show_bug.cgi?id=163421 |
| case "type_index": break; // improve checking https://bugs.webkit.org/show_bug.cgi?id=163421 |
| case "value": |
| assert.truthy(_isValidValue(got, ret[0]), `Invalid value on ${op}: got "${got}", expected ${ret[0]}`); |
| break; |
| case "flags": break; // improve checking https://bugs.webkit.org/show_bug.cgi?id=163421 |
| case "offset": break; // improve checking https://bugs.webkit.org/show_bug.cgi?id=163421 |
| // Control: |
| case "default_target": break; // improve checking https://bugs.webkit.org/show_bug.cgi?id=163421 |
| case "relative_depth": break; // improve checking https://bugs.webkit.org/show_bug.cgi?id=163421 |
| case "sig": |
| assert.truthy(WASM.isValidBlockType(imms[idx]), `Invalid block type on ${op}: "${imms[idx]}"`); |
| break; |
| case "target_count": break; // improve checking https://bugs.webkit.org/show_bug.cgi?id=163421 |
| case "target_table": break; // improve checking https://bugs.webkit.org/show_bug.cgi?id=163421 |
| case "reserved": break; // improve checking https://bugs.webkit.org/show_bug.cgi?id=163421 |
| default: throw new Error(`Implementation problem: unhandled immediate "${expect.name}" on "${op}"`); |
| } |
| } |
| }; |
| |
| const _createFunctionBuilder = (func, builder, previousBuilder) => { |
| let functionBuilder = {}; |
| for (const op in WASM.description.opcode) { |
| const name = util.toJavaScriptName(op); |
| const value = WASM.description.opcode[op].value; |
| const ret = WASM.description.opcode[op]["return"]; |
| const param = WASM.description.opcode[op].parameter; |
| const imm = WASM.description.opcode[op].immediate; |
| |
| const checkStackArgs = builder._checked ? _checkStackArgs : () => {}; |
| const checkStackReturn = builder._checked ? _checkStackReturn : () => {}; |
| const checkImms = builder._checked ? _checkImms : () => {}; |
| |
| functionBuilder[name] = (...args) => { |
| let nextBuilder; |
| switch (name) { |
| default: |
| nextBuilder = functionBuilder; |
| break; |
| case "End": |
| nextBuilder = previousBuilder; |
| break; |
| case "Block": |
| case "Loop": |
| case "If": |
| nextBuilder = _createFunctionBuilder(func, builder, functionBuilder); |
| break; |
| } |
| |
| // Passing a function as the argument is a way to nest blocks lexically. |
| const continuation = args[args.length - 1]; |
| const hasContinuation = typeof(continuation) === "function"; |
| const imms = hasContinuation ? args.slice(0, -1) : args; // FIXME: allow passing in stack values, as-if code were a stack machine. Just check for a builder to this function, and drop. https://bugs.webkit.org/show_bug.cgi?id=163422 |
| checkImms(op, imms, imm, ret); |
| checkStackArgs(op, param); |
| checkStackReturn(op, ret); |
| const stackArgs = []; // FIXME https://bugs.webkit.org/show_bug.cgi?id=162706 |
| func.code.push({ name: op, value: value, arguments: stackArgs, immediates: imms }); |
| if (hasContinuation) |
| return _errorHandlingProxyFor(continuation(nextBuilder).End()); |
| return _errorHandlingProxyFor(nextBuilder); |
| }; |
| }; |
| |
| return _errorHandlingProxyFor(functionBuilder); |
| } |
| |
| const _createFunction = (section, builder, previousBuilder) => { |
| return (...args) => { |
| const nameOffset = (typeof(args[0]) === "string") >>> 0; |
| const functionName = nameOffset ? args[0] : undefined; |
| let signature = args[0 + nameOffset]; |
| const locals = args[1 + nameOffset] === undefined ? [] : args[1 + nameOffset]; |
| for (const local of locals) |
| assert.truthy(WASM.isValidValueType(local), `Type of local: ${local} needs to be a valid value type`); |
| |
| if (typeof(signature) === "undefined") |
| signature = { params: [] }; |
| |
| let type; |
| let params; |
| if (typeof signature === "object") { |
| assert.hasObjectProperty(signature, "params", `Expect function signature to be an object with a "params" field, got "${signature}"`); |
| let ret; |
| ([params, ret] = _normalizeFunctionSignature(signature.params, signature.ret)); |
| signature = {params, ret}; |
| type = _maybeRegisterType(builder, signature); |
| } else { |
| assert.truthy(typeof signature === "number"); |
| const typeSection = builder._getSection("Type"); |
| assert.truthy(!!typeSection); |
| // FIXME: we should allow indices that exceed this to be able to |
| // test JSCs validator is correct. https://bugs.webkit.org/show_bug.cgi?id=165786 |
| assert.truthy(signature < typeSection.data.length); |
| type = signature; |
| signature = typeSection.data[signature]; |
| assert.hasObjectProperty(signature, "params", `Expect function signature to be an object with a "params" field, got "${signature}"`); |
| params = signature.params; |
| } |
| |
| const func = { |
| name: functionName, |
| type, |
| signature: signature, |
| locals: params.concat(locals), // Parameters are the first locals. |
| parameterCount: params.length, |
| code: [] |
| }; |
| |
| const functionSection = builder._getSection("Function"); |
| if (functionSection) |
| functionSection.data.push(func.type); |
| |
| section.data.push(func); |
| builder._registerFunctionToIndexSpace(functionName); |
| |
| return _createFunctionBuilder(func, builder, previousBuilder); |
| } |
| }; |
| |
| export default class Builder { |
| constructor() { |
| this.setChecked(true); |
| let preamble = {}; |
| for (const p of WASM.description.preamble) |
| preamble[p.name] = p.value; |
| this.setPreamble(preamble); |
| this._sections = []; |
| this._functionIndexSpace = new Map(); |
| this._functionIndexSpaceCount = 0; |
| this._registerSectionBuilders(); |
| } |
| setChecked(checked) { |
| this._checked = checked; |
| return this; |
| } |
| setPreamble(p) { |
| this._preamble = Object.assign(this._preamble || {}, p); |
| return this; |
| } |
| _functionIndexSpaceKeyHash(obj) { |
| // We don't need a full hash, just something that has a defined order for Map. Objects we insert aren't nested. |
| if (typeof(obj) !== 'object') |
| return obj; |
| const keys = Object.keys(obj).sort(); |
| let entries = []; |
| for (let k in keys) |
| entries.push([k, obj[k]]); |
| return JSON.stringify(entries); |
| } |
| _registerFunctionToIndexSpace(name) { |
| if (typeof(name) === "undefined") { |
| // Registering a nameless function still adds it to the function index space. Register it as something that can't normally be registered. |
| name = {}; |
| } |
| const value = this._functionIndexSpaceCount++; |
| // Collisions are fine: we'll simply count the function and forget the previous one. |
| this._functionIndexSpace.set(this._functionIndexSpaceKeyHash(name), value); |
| // Map it both ways, the number space is distinct from the name space. |
| this._functionIndexSpace.set(this._functionIndexSpaceKeyHash(value), name); |
| } |
| _getFunctionFromIndexSpace(name) { |
| return this._functionIndexSpace.get(this._functionIndexSpaceKeyHash(name)); |
| } |
| _registerSectionBuilders() { |
| for (const section in WASM.description.section) { |
| switch (section) { |
| case "Type": |
| this[section] = function() { |
| const s = this._addSection(section); |
| const builder = this; |
| const typeBuilder = { |
| End: () => builder, |
| Func: (params, ret) => { |
| [params, ret] = _normalizeFunctionSignature(params, ret); |
| s.data.push({ params: params, ret: ret }); |
| return _errorHandlingProxyFor(typeBuilder); |
| }, |
| }; |
| return _errorHandlingProxyFor(typeBuilder); |
| }; |
| break; |
| |
| case "Import": |
| this[section] = function() { |
| const s = this._addSection(section); |
| const importBuilder = { |
| End: () => this, |
| }; |
| importBuilder.Global = _importGlobalContinuation(this, s, importBuilder); |
| importBuilder.Function = _importFunctionContinuation(this, s, importBuilder); |
| importBuilder.Memory = _importMemoryContinuation(this, s, importBuilder); |
| importBuilder.Table = _importTableContinuation(this, s, importBuilder); |
| return _errorHandlingProxyFor(importBuilder); |
| }; |
| break; |
| |
| case "Function": |
| this[section] = function() { |
| const s = this._addSection(section); |
| const functionBuilder = { |
| End: () => this |
| // FIXME: add ability to add this with whatever. |
| }; |
| return _errorHandlingProxyFor(functionBuilder); |
| }; |
| break; |
| |
| case "Table": |
| this[section] = function() { |
| const s = this._addSection(section); |
| const tableBuilder = { |
| End: () => this, |
| Table: ({initial, maximum, element}) => { |
| s.data.push({tableDescription: {initial, maximum, element}}); |
| return _errorHandlingProxyFor(tableBuilder); |
| } |
| }; |
| return _errorHandlingProxyFor(tableBuilder); |
| }; |
| break; |
| |
| case "Memory": |
| this[section] = function() { |
| const s = this._addSection(section); |
| const memoryBuilder = { |
| End: () => this, |
| InitialMaxPages: (initial, maximum) => { |
| s.data.push({ initial, maximum }); |
| return _errorHandlingProxyFor(memoryBuilder); |
| } |
| }; |
| return _errorHandlingProxyFor(memoryBuilder); |
| }; |
| break; |
| |
| case "Global": |
| this[section] = function() { |
| const s = this._addSection(section); |
| const globalBuilder = { |
| End: () => this, |
| GetGlobal: (type, initValue, mutability) => { |
| s.data.push({ type, op: "get_global", mutability: _normalizeMutability(mutability), initValue }); |
| return _errorHandlingProxyFor(globalBuilder); |
| } |
| }; |
| for (let op of WASM.description.value_type) { |
| globalBuilder[util.toJavaScriptName(op)] = (initValue, mutability) => { |
| s.data.push({ type: op, op: op + ".const", mutability: _normalizeMutability(mutability), initValue }); |
| return _errorHandlingProxyFor(globalBuilder); |
| }; |
| } |
| return _errorHandlingProxyFor(globalBuilder); |
| }; |
| break; |
| |
| case "Export": |
| this[section] = function() { |
| const s = this._addSection(section); |
| const exportBuilder = { |
| End: () => this, |
| }; |
| exportBuilder.Global = _exportGlobalContinuation(this, s, exportBuilder); |
| exportBuilder.Function = _exportFunctionContinuation(this, s, exportBuilder); |
| exportBuilder.Memory = _exportMemoryContinuation(this, s, exportBuilder); |
| exportBuilder.Table = _exportTableContinuation(this, s, exportBuilder); |
| return _errorHandlingProxyFor(exportBuilder); |
| }; |
| break; |
| |
| case "Start": |
| this[section] = function(functionIndexOrName) { |
| const s = this._addSection(section); |
| const startBuilder = { |
| End: () => this, |
| }; |
| if (typeof(functionIndexOrName) !== "number" && typeof(functionIndexOrName) !== "string") |
| throw new Error(`Start section's function index must either be a number or a string`); |
| s.data.push(functionIndexOrName); |
| return _errorHandlingProxyFor(startBuilder); |
| }; |
| break; |
| |
| case "Element": |
| this[section] = function(...args) { |
| if (args.length !== 0 && this._checked) |
| throw new Error("You're doing it wrong. This element does not take arguments. You must chain the call with another Element()"); |
| |
| const s = this._addSection(section); |
| const elementBuilder = { |
| End: () => this, |
| Element: ({tableIndex = 0, offset, functionIndices}) => { |
| s.data.push({tableIndex, offset, functionIndices}); |
| return _errorHandlingProxyFor(elementBuilder); |
| } |
| }; |
| |
| return _errorHandlingProxyFor(elementBuilder); |
| }; |
| break; |
| |
| case "Code": |
| this[section] = function() { |
| const s = this._addSection(section); |
| const builder = this; |
| const codeBuilder = { |
| End: () => { |
| // We now have enough information to remap the export section's "type" and "index" according to the Code section we are currently ending. |
| const typeSection = builder._getSection("Type"); |
| const importSection = builder._getSection("Import"); |
| const exportSection = builder._getSection("Export"); |
| const startSection = builder._getSection("Start"); |
| const codeSection = s; |
| if (exportSection) { |
| for (const e of exportSection.data) { |
| if (e.kind !== "Function" || typeof(e.type) !== "undefined") |
| continue; |
| switch (typeof(e.index)) { |
| default: throw new Error(`Unexpected export index "${e.index}"`); |
| case "string": { |
| const index = builder._getFunctionFromIndexSpace(e.index); |
| assert.isNumber(index, `Export section contains undefined function "${e.index}"`); |
| e.index = index; |
| } // Fallthrough. |
| case "number": { |
| const index = builder._getFunctionFromIndexSpace(e.index); |
| if (builder._checked) |
| assert.isNotUndef(index, `Export "${e.field}" does not correspond to a defined value in the function index space`); |
| } break; |
| case "undefined": |
| throw new Error(`Unimplemented: Function().End() with undefined export index`); // FIXME |
| } |
| if (typeof(e.type) === "undefined") { |
| // This must be a function export from the Code section (re-exports were handled earlier). |
| let functionIndexSpaceOffset = 0; |
| if (importSection) { |
| for (const {kind} of importSection.data) { |
| if (kind === "Function") |
| ++functionIndexSpaceOffset; |
| } |
| } |
| const functionIndex = e.index - functionIndexSpaceOffset; |
| e.type = codeSection.data[functionIndex].type; |
| } |
| } |
| } |
| if (startSection) { |
| const start = startSection.data[0]; |
| let mapped = builder._getFunctionFromIndexSpace(start); |
| if (!builder._checked) { |
| if (typeof(mapped) === "undefined") |
| mapped = start; // In unchecked mode, simply use what was provided if it's nonsensical. |
| assert.isA(start, "number"); // It can't be too nonsensical, otherwise we can't create a binary. |
| startSection.data[0] = start; |
| } else { |
| if (typeof(mapped) === "undefined") |
| throw new Error(`Start section refers to non-existant function '${start}'`); |
| if (typeof(start) === "string" || typeof(start) === "object") |
| startSection.data[0] = mapped; |
| // FIXME in checked mode, test that the type is acceptable for start function. We probably want _registerFunctionToIndexSpace to also register types per index. https://bugs.webkit.org/show_bug.cgi?id=165658 |
| } |
| } |
| return _errorHandlingProxyFor(builder); |
| }, |
| |
| }; |
| codeBuilder.Function = _createFunction(s, builder, codeBuilder); |
| return _errorHandlingProxyFor(codeBuilder); |
| }; |
| break; |
| |
| case "Data": |
| this[section] = function() { |
| const s = this._addSection(section); |
| const dataBuilder = { |
| End: () => this, |
| Segment: data => { |
| assert.isArray(data); |
| for (const datum of data) { |
| assert.isNumber(datum); |
| assert.ge(datum, 0); |
| assert.le(datum, 0xff); |
| } |
| s.data.push({ data: data, index: 0, offset: 0 }); |
| let thisSegment = s.data[s.data.length - 1]; |
| const segmentBuilder = { |
| End: () => dataBuilder, |
| Index: index => { |
| assert.eq(index, 0); // Linear memory index must be zero in MVP. |
| thisSegment.index = index; |
| return _errorHandlingProxyFor(segmentBuilder); |
| }, |
| Offset: offset => { |
| // FIXME allow complex init_expr here. https://bugs.webkit.org/show_bug.cgi?id=165700 |
| assert.isNumber(offset); |
| thisSegment.offset = offset; |
| return _errorHandlingProxyFor(segmentBuilder); |
| }, |
| }; |
| return _errorHandlingProxyFor(segmentBuilder); |
| }, |
| }; |
| return _errorHandlingProxyFor(dataBuilder); |
| }; |
| break; |
| |
| default: |
| this[section] = () => { throw new Error(`Unknown section type "${section}"`); }; |
| break; |
| } |
| } |
| |
| this.Unknown = function(name) { |
| const s = this._addSection(name); |
| const builder = this; |
| const unknownBuilder = { |
| End: () => builder, |
| Byte: b => { |
| assert.eq(b & 0xFF, b, `Unknown section expected byte, got: "${b}"`); |
| s.data.push(b); |
| return _errorHandlingProxyFor(unknownBuilder); |
| } |
| }; |
| return _errorHandlingProxyFor(unknownBuilder); |
| }; |
| } |
| _addSection(nameOrNumber, extraObject) { |
| const name = typeof(nameOrNumber) === "string" ? nameOrNumber : ""; |
| const number = typeof(nameOrNumber) === "number" ? nameOrNumber : (WASM.description.section[name] ? WASM.description.section[name].value : _unknownSectionId); |
| if (this._checked) { |
| // Check uniqueness. |
| for (const s of this._sections) |
| if (number !== _unknownSectionId) |
| assert.falsy(s.name === name && s.id === number, `Cannot have two sections with the same name "${name}" and ID ${number}`); |
| // Check ordering. |
| if ((number !== _unknownSectionId) && (this._sections.length !== 0)) { |
| for (let i = this._sections.length - 1; i >= 0; --i) { |
| if (this._sections[i].id === _unknownSectionId) |
| continue; |
| assert.le(this._sections[i].id, number, `Bad section ordering: "${this._sections[i].name}" cannot precede "${name}"`); |
| break; |
| } |
| } |
| } |
| const s = Object.assign({ name: name, id: number, data: [] }, extraObject || {}); |
| this._sections.push(s); |
| return s; |
| } |
| _getSection(nameOrNumber) { |
| switch (typeof(nameOrNumber)) { |
| default: throw new Error(`Implementation problem: can not get section "${nameOrNumber}"`); |
| case "string": |
| for (const s of this._sections) |
| if (s.name === nameOrNumber) |
| return s; |
| return undefined; |
| case "number": |
| for (const s of this._sections) |
| if (s.id === nameOrNumber) |
| return s; |
| return undefined; |
| } |
| } |
| optimize() { |
| // FIXME Add more optimizations. https://bugs.webkit.org/show_bug.cgi?id=163424 |
| return this; |
| } |
| json() { |
| const obj = { |
| preamble: this._preamble, |
| section: this._sections |
| }; |
| // JSON.stringify serializes -0.0 as 0.0. |
| const replacer = (key, value) => { |
| if (value === 0.0 && 1.0 / value === -Infinity) |
| return "NEGATIVE_ZERO"; |
| return value; |
| }; |
| return JSON.stringify(obj, replacer); |
| } |
| AsmJS() { |
| "use asm"; // For speed. |
| // FIXME Create an asm.js equivalent string which can be eval'd. https://bugs.webkit.org/show_bug.cgi?id=163425 |
| throw new Error("asm.js not implemented yet"); |
| } |
| WebAssembly() { return BuildWebAssembly.Binary(this._preamble, this._sections); } |
| }; |
