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main_repo / deps / v8 / src / apinatives.js @ 40c0f755
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// Copyright 2006-2008 the V8 project authors. All rights reserved.
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// Redistribution and use in source and binary forms, with or without
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// modification, are permitted provided that the following conditions are
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// met:
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//
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// * Redistributions of source code must retain the above copyright
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// notice, this list of conditions and the following disclaimer.
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// * Redistributions in binary form must reproduce the above
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// copyright notice, this list of conditions and the following
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// disclaimer in the documentation and/or other materials provided
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// with the distribution.
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// * Neither the name of Google Inc. nor the names of its
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// contributors may be used to endorse or promote products derived
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// from this software without specific prior written permission.
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//
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// THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
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// "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
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// LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
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// A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
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// OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
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// SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
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// LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
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// DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
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// THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
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// (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
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// OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
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// This file contains infrastructure used by the API. See
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// v8natives.js for an explanation of these files are processed and
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// loaded.
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function CreateDate(time) { |
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var date = new ORIGINAL_DATE(); |
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date.setTime(time); |
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return date;
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} |
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const kApiFunctionCache = {}; |
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const functionCache = kApiFunctionCache; |
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function Instantiate(data, name) { |
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if (!%IsTemplate(data)) return data; |
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var tag = %GetTemplateField(data, kApiTagOffset);
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switch (tag) {
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case kFunctionTag:
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return InstantiateFunction(data, name);
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case kNewObjectTag:
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var Constructor = %GetTemplateField(data, kApiConstructorOffset);
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var result = Constructor ? new (Instantiate(Constructor))() : {}; |
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ConfigureTemplateInstance(result, data); |
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return result;
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default:
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throw 'Unknown API tag <' + tag + '>'; |
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} |
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} |
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function InstantiateFunction(data, name) { |
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// We need a reference to kApiFunctionCache in the stack frame
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// if we need to bail out from a stack overflow.
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var cache = kApiFunctionCache;
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var serialNumber = %GetTemplateField(data, kApiSerialNumberOffset);
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var isFunctionCached =
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(serialNumber in cache) && (cache[serialNumber] != kUninitialized);
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if (!isFunctionCached) {
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try {
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cache[serialNumber] = null;
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var fun = %CreateApiFunction(data);
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if (name) %FunctionSetName(fun, name);
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cache[serialNumber] = fun; |
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var prototype = %GetTemplateField(data, kApiPrototypeTemplateOffset);
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fun.prototype = prototype ? Instantiate(prototype) : {}; |
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%SetProperty(fun.prototype, "constructor", fun, DONT_ENUM);
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var parent = %GetTemplateField(data, kApiParentTemplateOffset);
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if (parent) {
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var parent_fun = Instantiate(parent);
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fun.prototype.__proto__ = parent_fun.prototype; |
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} |
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ConfigureTemplateInstance(fun, data); |
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} catch (e) {
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cache[serialNumber] = kUninitialized; |
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throw e;
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} |
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} |
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return cache[serialNumber];
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} |
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function ConfigureTemplateInstance(obj, data) { |
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var properties = %GetTemplateField(data, kApiPropertyListOffset);
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if (properties) {
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// Disable access checks while instantiating the object.
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var requires_access_checks = %DisableAccessChecks(obj);
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try {
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for (var i = 0; i < properties[0]; i += 3) { |
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var name = properties[i + 1]; |
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var prop_data = properties[i + 2]; |
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var attributes = properties[i + 3]; |
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var value = Instantiate(prop_data, name);
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%SetProperty(obj, name, value, attributes); |
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} |
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} finally {
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if (requires_access_checks) %EnableAccessChecks(obj);
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} |
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} |
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} |