runtime/JSSymbolTableObject.h

   1 /*
   2  * Copyright (C) 2012 Apple Inc. All rights reserved.
   3  *
   4  * Redistribution and use in source and binary forms, with or without
   5  * modification, are permitted provided that the following conditions
   6  * are met:
   7  *
   8  * 1.  Redistributions of source code must retain the above copyright
   9  *     notice, this list of conditions and the following disclaimer.
  10  * 2.  Redistributions in binary form must reproduce the above copyright
  11  *     notice, this list of conditions and the following disclaimer in the
  12  *     documentation and/or other materials provided with the distribution.
  13  * 3.  Neither the name of Apple Computer, Inc. ("Apple") nor the names of
  14  *     its contributors may be used to endorse or promote products derived
  15  *     from this software without specific prior written permission.
  16  *
  17  * THIS SOFTWARE IS PROVIDED BY APPLE AND ITS CONTRIBUTORS "AS IS" AND ANY
  18  * EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED
  19  * WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
  20  * DISCLAIMED. IN NO EVENT SHALL APPLE OR ITS CONTRIBUTORS BE LIABLE FOR ANY
  21  * DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES
  22  * (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
  23  * LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND
  24  * ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
  25  * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
  26  * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
  27  */
  28
  29 #ifndef JSSymbolTableObject_h
  30 #define JSSymbolTableObject_h
  31
  32 #include "JSScope.h"
  33 #include "PropertyDescriptor.h"
  34 #include "SymbolTable.h"
  35
  36 namespace JSC {
  37
  38 class JSSymbolTableObject : public JSScope {
  39 public:
  40     typedef JSScope Base;
  41
  42     SharedSymbolTable* symbolTable() const { return m_symbolTable.get(); }
  43
  44     static NO_RETURN_DUE_TO_CRASH void putDirectVirtual(JSObject*, ExecState*, PropertyName, JSValue, unsigned attributes);
  45
  46     JS_EXPORT_PRIVATE static bool deleteProperty(JSCell*, ExecState*, PropertyName);
  47     JS_EXPORT_PRIVATE static void getOwnNonIndexPropertyNames(JSObject*, ExecState*, PropertyNameArray&, EnumerationMode);
  48
  49 protected:
  50     static const unsigned StructureFlags = IsEnvironmentRecord | OverridesVisitChildren | OverridesGetPropertyNames | Base::StructureFlags;
  51
  52     JSSymbolTableObject(VM& vm, Structure* structure, JSScope* scope, SharedSymbolTable* symbolTable = 0)
  53         : Base(vm, structure, scope)
  54     {
  55         if (symbolTable)
  56             m_symbolTable.set(vm, this, symbolTable);
  57     }
  58
  59     void finishCreation(VM& vm)
  60     {
  61         Base::finishCreation(vm);
  62         if (!m_symbolTable)
  63             m_symbolTable.set(vm, this, SharedSymbolTable::create(vm));
  64     }
  65
  66     static void visitChildren(JSCell*, SlotVisitor&);
  67
  68     WriteBarrier<SharedSymbolTable> m_symbolTable;
  69 };
  70
  71 template<typename SymbolTableObjectType>
  72 inline bool symbolTableGet(
  73     SymbolTableObjectType* object, PropertyName propertyName, PropertySlot& slot)
  74 {
  75     SymbolTable& symbolTable = *object->symbolTable();
  76     SymbolTable::iterator iter = symbolTable.find(propertyName.publicName());
  77     if (iter == symbolTable.end())
  78         return false;
  79     SymbolTableEntry::Fast entry = iter->value;
  80     ASSERT(!entry.isNull());
  81     slot.setValue(object->registerAt(entry.getIndex()).get());
  82     return true;
  83 }
  84
  85 template<typename SymbolTableObjectType>
  86 inline bool symbolTableGet(
  87     SymbolTableObjectType* object, PropertyName propertyName, PropertyDescriptor& descriptor)
  88 {
  89     SymbolTable& symbolTable = *object->symbolTable();
  90     SymbolTable::iterator iter = symbolTable.find(propertyName.publicName());
  91     if (iter == symbolTable.end())
  92         return false;
  93     SymbolTableEntry::Fast entry = iter->value;
  94     ASSERT(!entry.isNull());
  95     descriptor.setDescriptor(
  96         object->registerAt(entry.getIndex()).get(), entry.getAttributes() | DontDelete);
  97     return true;
  98 }
  99
 100 template<typename SymbolTableObjectType>
 101 inline bool symbolTableGet(
 102     SymbolTableObjectType* object, PropertyName propertyName, PropertySlot& slot,
 103     bool& slotIsWriteable)
 104 {
 105     SymbolTable& symbolTable = *object->symbolTable();
 106     SymbolTable::iterator iter = symbolTable.find(propertyName.publicName());
 107     if (iter == symbolTable.end())
 108         return false;
 109     SymbolTableEntry::Fast entry = iter->value;
 110     ASSERT(!entry.isNull());
 111     slot.setValue(object->registerAt(entry.getIndex()).get());
 112     slotIsWriteable = !entry.isReadOnly();
 113     return true;
 114 }
 115
 116 template<typename SymbolTableObjectType>
 117 inline bool symbolTablePut(
 118     SymbolTableObjectType* object, ExecState* exec, PropertyName propertyName, JSValue value,
 119     bool shouldThrow)
 120 {
 121     VM& vm = exec->vm();
 122     ASSERT(!Heap::heap(value) || Heap::heap(value) == Heap::heap(object));
 123
 124     SymbolTable& symbolTable = *object->symbolTable();
 125     SymbolTable::iterator iter = symbolTable.find(propertyName.publicName());
 126     if (iter == symbolTable.end())
 127         return false;
 128     bool wasFat;
 129     SymbolTableEntry::Fast fastEntry = iter->value.getFast(wasFat);
 130     ASSERT(!fastEntry.isNull());
 131     if (fastEntry.isReadOnly()) {
 132         if (shouldThrow)
 133             throwTypeError(exec, StrictModeReadonlyPropertyWriteError);
 134         return true;
 135     }
 136     if (UNLIKELY(wasFat))
 137         iter->value.notifyWrite();
 138     object->registerAt(fastEntry.getIndex()).set(vm, object, value);
 139     return true;
 140 }
 141
 142 template<typename SymbolTableObjectType>
 143 inline bool symbolTablePutWithAttributes(
 144     SymbolTableObjectType* object, VM& vm, PropertyName propertyName,
 145     JSValue value, unsigned attributes)
 146 {
 147     ASSERT(!Heap::heap(value) || Heap::heap(value) == Heap::heap(object));
 148
 149     SymbolTable::iterator iter = object->symbolTable()->find(propertyName.publicName());
 150     if (iter == object->symbolTable()->end())
 151         return false;
 152     SymbolTableEntry& entry = iter->value;
 153     ASSERT(!entry.isNull());
 154     entry.notifyWrite();
 155     entry.setAttributes(attributes);
 156     object->registerAt(entry.getIndex()).set(vm, object, value);
 157     return true;
 158 }
 159
 160 } // namespace JSC
 161
 162 #endif // JSSymbolTableObject_h
 163