runtime/ClassInfo.h

   1 /*
   2  *  Copyright (C) 1999-2001 Harri Porten (porten@kde.org)
   3  *  Copyright (C) 2001 Peter Kelly (pmk@post.com)
   4  *  Copyright (C) 2003, 2004, 2005, 2006, 2007, 2008 Apple Inc. All rights reserved.
   5  *
   6  *  This library is free software; you can redistribute it and/or
   7  *  modify it under the terms of the GNU Library General Public
   8  *  License as published by the Free Software Foundation; either
   9  *  version 2 of the License, or (at your option) any later version.
  10  *
  11  *  This library is distributed in the hope that it will be useful,
  12  *  but WITHOUT ANY WARRANTY; without even the implied warranty of
  13  *  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
  14  *  Library General Public License for more details.
  15  *
  16  *  You should have received a copy of the GNU Library General Public License
  17  *  along with this library; see the file COPYING.LIB.  If not, write to
  18  *  the Free Software Foundation, Inc., 51 Franklin Street, Fifth Floor,
  19  *  Boston, MA 02110-1301, USA.
  20  *
  21  */
  22
  23 #ifndef ClassInfo_h
  24 #define ClassInfo_h
  25
  26 #include "CallFrame.h"
  27 #include "ConstructData.h"
  28 #include "JSCell.h"
  29
  30 namespace JSC {
  31
  32     class HashEntry;
  33     struct HashTable;
  34
  35     struct MethodTable {
  36         typedef void (*DestroyFunctionPtr)(JSCell*);
  37         DestroyFunctionPtr destroy;
  38
  39         typedef void (*VisitChildrenFunctionPtr)(JSCell*, SlotVisitor&);
  40         VisitChildrenFunctionPtr visitChildren;
  41
  42         typedef CallType (*GetCallDataFunctionPtr)(JSCell*, CallData&);
  43         GetCallDataFunctionPtr getCallData;
  44
  45         typedef ConstructType (*GetConstructDataFunctionPtr)(JSCell*, ConstructData&);
  46         GetConstructDataFunctionPtr getConstructData;
  47
  48         typedef void (*PutFunctionPtr)(JSCell*, ExecState*, const Identifier& propertyName, JSValue, PutPropertySlot&);
  49         PutFunctionPtr put;
  50
  51         typedef void (*PutByIndexFunctionPtr)(JSCell*, ExecState*, unsigned propertyName, JSValue, bool shouldThrow);
  52         PutByIndexFunctionPtr putByIndex;
  53
  54         typedef bool (*DeletePropertyFunctionPtr)(JSCell*, ExecState*, const Identifier&);
  55         DeletePropertyFunctionPtr deleteProperty;
  56
  57         typedef bool (*DeletePropertyByIndexFunctionPtr)(JSCell*, ExecState*, unsigned);
  58         DeletePropertyByIndexFunctionPtr deletePropertyByIndex;
  59
  60         typedef bool (*GetOwnPropertySlotFunctionPtr)(JSCell*, ExecState*, const Identifier&, PropertySlot&);
  61         GetOwnPropertySlotFunctionPtr getOwnPropertySlot;
  62
  63         typedef bool (*GetOwnPropertySlotByIndexFunctionPtr)(JSCell*, ExecState*, unsigned, PropertySlot&);
  64         GetOwnPropertySlotByIndexFunctionPtr getOwnPropertySlotByIndex;
  65
  66         typedef JSObject* (*ToThisObjectFunctionPtr)(JSCell*, ExecState*);
  67         ToThisObjectFunctionPtr toThisObject;
  68
  69         typedef JSValue (*DefaultValueFunctionPtr)(const JSObject*, ExecState*, PreferredPrimitiveType);
  70         DefaultValueFunctionPtr defaultValue;
  71
  72         typedef void (*GetOwnPropertyNamesFunctionPtr)(JSObject*, ExecState*, PropertyNameArray&, EnumerationMode);
  73         GetOwnPropertyNamesFunctionPtr getOwnPropertyNames;
  74
  75         typedef void (*GetPropertyNamesFunctionPtr)(JSObject*, ExecState*, PropertyNameArray&, EnumerationMode);
  76         GetPropertyNamesFunctionPtr getPropertyNames;
  77
  78         typedef UString (*ClassNameFunctionPtr)(const JSObject*);
  79         ClassNameFunctionPtr className;
  80
  81         typedef bool (*HasInstanceFunctionPtr)(JSObject*, ExecState*, JSValue, JSValue);
  82         HasInstanceFunctionPtr hasInstance;
  83
  84         typedef void (*PutWithAttributesFunctionPtr)(JSObject*, ExecState*, const Identifier& propertyName, JSValue, unsigned attributes);
  85         PutWithAttributesFunctionPtr putDirectVirtual;
  86
  87         typedef bool (*DefineOwnPropertyFunctionPtr)(JSObject*, ExecState*, const Identifier&, PropertyDescriptor&, bool);
  88         DefineOwnPropertyFunctionPtr defineOwnProperty;
  89
  90         typedef bool (*GetOwnPropertyDescriptorFunctionPtr)(JSObject*, ExecState*, const Identifier&, PropertyDescriptor&);
  91         GetOwnPropertyDescriptorFunctionPtr getOwnPropertyDescriptor;
  92     };
  93
  94 #define CREATE_MEMBER_CHECKER(member) \
  95 template <typename T> \
  96 struct MemberCheck##member { \
  97     struct Fallback { \
  98         void member(...); \
  99     }; \
 100     struct Derived : T, Fallback { }; \
 101     template <typename U, U> struct Check; \
 102     typedef char Yes[2]; \
 103     typedef char No[1]; \
 104     template <typename U> \
 105     static No &func(Check<void (Fallback::*)(...), &U::member>*); \
 106     template <typename U> \
 107     static Yes &func(...); \
 108     enum { has = sizeof(func<Derived>(0)) == sizeof(Yes) }; \
 109 }
 110
 111 #define HAS_MEMBER_NAMED(klass, name) (MemberCheck##name<klass>::has)
 112
 113 #define CREATE_METHOD_TABLE(ClassName) { \
 114         &ClassName::destroy, \
 115         &ClassName::visitChildren, \
 116         &ClassName::getCallData, \
 117         &ClassName::getConstructData, \
 118         &ClassName::put, \
 119         &ClassName::putByIndex, \
 120         &ClassName::deleteProperty, \
 121         &ClassName::deletePropertyByIndex, \
 122         &ClassName::getOwnPropertySlot, \
 123         &ClassName::getOwnPropertySlotByIndex, \
 124         &ClassName::toThisObject, \
 125         &ClassName::defaultValue, \
 126         &ClassName::getOwnPropertyNames, \
 127         &ClassName::getPropertyNames, \
 128         &ClassName::className, \
 129         &ClassName::hasInstance, \
 130         &ClassName::putDirectVirtual, \
 131         &ClassName::defineOwnProperty, \
 132         &ClassName::getOwnPropertyDescriptor, \
 133     }, \
 134     ClassName::TypedArrayStorageType
 135
 136     struct ClassInfo {
 137         /**
 138          * A string denoting the class name. Example: "Window".
 139          */
 140         const char* className;
 141
 142         /**
 143          * Pointer to the class information of the base class.
 144          * 0L if there is none.
 145          */
 146         const ClassInfo* parentClass;
 147         /**
 148          * Static hash-table of properties.
 149          * For classes that can be used from multiple threads, it is accessed via a getter function that would typically return a pointer to thread-specific value.
 150          */
 151         const HashTable* propHashTable(ExecState* exec) const
 152         {
 153             if (classPropHashTableGetterFunction)
 154                 return classPropHashTableGetterFunction(exec);
 155             return staticPropHashTable;
 156         }
 157
 158         bool isSubClassOf(const ClassInfo* other) const
 159         {
 160             for (const ClassInfo* ci = this; ci; ci = ci->parentClass) {
 161                 if (ci == other)
 162                     return true;
 163             }
 164             return false;
 165         }
 166
 167         bool hasStaticProperties() const
 168         {
 169             for (const ClassInfo* ci = this; ci; ci = ci->parentClass) {
 170                 if (ci->staticPropHashTable || ci->classPropHashTableGetterFunction)
 171                     return true;
 172             }
 173             return false;
 174         }
 175
 176         const HashTable* staticPropHashTable;
 177         typedef const HashTable* (*ClassPropHashTableGetterFunction)(ExecState*);
 178         const ClassPropHashTableGetterFunction classPropHashTableGetterFunction;
 179
 180         MethodTable methodTable;
 181
 182         TypedArrayType typedArrayStorageType;
 183     };
 184
 185 } // namespace JSC
 186
 187 #endif // ClassInfo_h