1 // Copyright 2006-2008 the V8 project authors. All rights reserved. 2 // Redistribution and use in source and binary forms, with or without 3 // modification, are permitted provided that the following conditions are 4 // met: 5 // 6 // * Redistributions of source code must retain the above copyright 7 // notice, this list of conditions and the following disclaimer. 8 // * Redistributions in binary form must reproduce the above 9 // copyright notice, this list of conditions and the following 10 // disclaimer in the documentation and/or other materials provided 11 // with the distribution. 12 // * Neither the name of Google Inc. nor the names of its 13 // contributors may be used to endorse or promote products derived 14 // from this software without specific prior written permission. 15 // 16 // THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS 17 // "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT 18 // LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR 19 // A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT 20 // OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, 21 // SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT 22 // LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, 23 // DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY 24 // THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT 25 // (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE 26 // OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. 27 28 // This file contains infrastructure used by the API. See 29 // v8natives.js for an explanation of these files are processed and 30 // loaded. 31 32 33 function CreateDate(time) { 34 var date = new $Date(); 35 date.setTime(time); 36 return date; 37 } 38 39 40 const kApiFunctionCache = {}; 41 const functionCache = kApiFunctionCache; 42 43 44 function Instantiate(data, name) { 45 if (!%IsTemplate(data)) return data; 46 var tag = %GetTemplateField(data, kApiTagOffset); 47 switch (tag) { 48 case kFunctionTag: 49 return InstantiateFunction(data, name); 50 case kNewObjectTag: 51 var Constructor = %GetTemplateField(data, kApiConstructorOffset); 52 var result = Constructor ? new (Instantiate(Constructor))() : {}; 53 ConfigureTemplateInstance(result, data); 54 result = %ToFastProperties(result); 55 return result; 56 default: 57 throw 'Unknown API tag <' + tag + '>'; 58 } 59 } 60 61 62 function InstantiateFunction(data, name) { 63 // We need a reference to kApiFunctionCache in the stack frame 64 // if we need to bail out from a stack overflow. 65 var cache = kApiFunctionCache; 66 var serialNumber = %GetTemplateField(data, kApiSerialNumberOffset); 67 var isFunctionCached = 68 (serialNumber in cache) && (cache[serialNumber] != kUninitialized); 69 if (!isFunctionCached) { 70 try { 71 cache[serialNumber] = null; 72 var fun = %CreateApiFunction(data); 73 if (name) %FunctionSetName(fun, name); 74 cache[serialNumber] = fun; 75 var prototype = %GetTemplateField(data, kApiPrototypeTemplateOffset); 76 fun.prototype = prototype ? Instantiate(prototype) : {}; 77 %SetProperty(fun.prototype, "constructor", fun, DONT_ENUM); 78 var parent = %GetTemplateField(data, kApiParentTemplateOffset); 79 if (parent) { 80 var parent_fun = Instantiate(parent); 81 fun.prototype.__proto__ = parent_fun.prototype; 82 } 83 ConfigureTemplateInstance(fun, data); 84 } catch (e) { 85 cache[serialNumber] = kUninitialized; 86 throw e; 87 } 88 } 89 return cache[serialNumber]; 90 } 91 92 93 function ConfigureTemplateInstance(obj, data) { 94 var properties = %GetTemplateField(data, kApiPropertyListOffset); 95 if (properties) { 96 // Disable access checks while instantiating the object. 97 var requires_access_checks = %DisableAccessChecks(obj); 98 try { 99 for (var i = 0; i < properties[0]; i += 3) { 100 var name = properties[i + 1]; 101 var prop_data = properties[i + 2]; 102 var attributes = properties[i + 3]; 103 var value = Instantiate(prop_data, name); 104 %SetProperty(obj, name, value, attributes); 105 } 106 } finally { 107 if (requires_access_checks) %EnableAccessChecks(obj); 108 } 109 } 110 } 111