runtime/JSArray.h

   1 /*
   2  *  Copyright (C) 1999-2000 Harri Porten (porten@kde.org)
   3  *  Copyright (C) 2003, 2007, 2008 Apple Inc. All rights reserved.
   4  *
   5  *  This library is free software; you can redistribute it and/or
   6  *  modify it under the terms of the GNU Lesser General Public
   7  *  License as published by the Free Software Foundation; either
   8  *  version 2 of the License, or (at your option) any later version.
   9  *
  10  *  This library is distributed in the hope that it will be useful,
  11  *  but WITHOUT ANY WARRANTY; without even the implied warranty of
  12  *  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
  13  *  Lesser General Public License for more details.
  14  *
  15  *  You should have received a copy of the GNU Lesser General Public
  16  *  License along with this library; if not, write to the Free Software
  17  *  Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA  02110-1301  USA
  18  *
  19  */
  20
  21 #ifndef JSArray_h
  22 #define JSArray_h
  23
  24 #include "JSObject.h"
  25
  26 namespace JSC {
  27
  28     typedef HashMap<unsigned, JSValuePtr> SparseArrayValueMap;
  29
  30     struct ArrayStorage {
  31         unsigned m_length;
  32         unsigned m_vectorLength;
  33         unsigned m_numValuesInVector;
  34         SparseArrayValueMap* m_sparseValueMap;
  35         void* lazyCreationData; // A JSArray subclass can use this to fill the vector lazily.
  36         JSValuePtr m_vector[1];
  37     };
  38
  39     class JSArray : public JSObject {
  40         friend class JIT;
  41
  42     public:
  43         explicit JSArray(PassRefPtr<Structure>);
  44         JSArray(PassRefPtr<Structure>, unsigned initialLength);
  45         JSArray(ExecState*, PassRefPtr<Structure>, const ArgList& initialValues);
  46         virtual ~JSArray();
  47
  48         virtual bool getOwnPropertySlot(ExecState*, const Identifier& propertyName, PropertySlot&);
  49         virtual bool getOwnPropertySlot(ExecState*, unsigned propertyName, PropertySlot&);
  50         virtual void put(ExecState*, unsigned propertyName, JSValuePtr); // FIXME: Make protected and add setItem.
  51
  52         static const ClassInfo info;
  53
  54         unsigned length() const { return m_storage->m_length; }
  55         void setLength(unsigned); // OK to use on new arrays, but not if it might be a RegExpMatchArray.
  56
  57         void sort(ExecState*);
  58         void sort(ExecState*, JSValuePtr compareFunction, CallType, const CallData&);
  59         void sortNumeric(ExecState*, JSValuePtr compareFunction, CallType, const CallData&);
  60
  61         void push(ExecState*, JSValuePtr);
  62         JSValuePtr pop();
  63
  64         bool canGetIndex(unsigned i) { return i < m_fastAccessCutoff; }
  65         JSValuePtr getIndex(unsigned i)
  66         {
  67             ASSERT(canGetIndex(i));
  68             return m_storage->m_vector[i];
  69         }
  70
  71         bool canSetIndex(unsigned i) { return i < m_fastAccessCutoff; }
  72         JSValuePtr setIndex(unsigned i, JSValuePtr v)
  73         {
  74             ASSERT(canSetIndex(i));
  75             return m_storage->m_vector[i] = v;
  76         }
  77
  78         void fillArgList(ExecState*, ArgList&);
  79
  80         static PassRefPtr<Structure> createStructure(JSValuePtr prototype)
  81         {
  82             return Structure::create(prototype, TypeInfo(ObjectType));
  83         }
  84
  85     protected:
  86         virtual void put(ExecState*, const Identifier& propertyName, JSValuePtr, PutPropertySlot&);
  87         virtual bool deleteProperty(ExecState*, const Identifier& propertyName);
  88         virtual bool deleteProperty(ExecState*, unsigned propertyName);
  89         virtual void getPropertyNames(ExecState*, PropertyNameArray&);
  90         virtual void mark();
  91
  92         void* lazyCreationData();
  93         void setLazyCreationData(void*);
  94
  95     private:
  96         virtual const ClassInfo* classInfo() const { return &info; }
  97
  98         bool getOwnPropertySlotSlowCase(ExecState*, unsigned propertyName, PropertySlot&);
  99         void putSlowCase(ExecState*, unsigned propertyName, JSValuePtr);
 100
 101         bool increaseVectorLength(unsigned newLength);
 102
 103         unsigned compactForSorting();
 104
 105         enum ConsistencyCheckType { NormalConsistencyCheck, DestructorConsistencyCheck, SortConsistencyCheck };
 106         void checkConsistency(ConsistencyCheckType = NormalConsistencyCheck);
 107
 108         unsigned m_fastAccessCutoff;
 109         ArrayStorage* m_storage;
 110     };
 111
 112     JSArray* asArray(JSValuePtr);
 113
 114     JSArray* constructEmptyArray(ExecState*);
 115     JSArray* constructEmptyArray(ExecState*, unsigned initialLength);
 116     JSArray* constructArray(ExecState*, JSValuePtr singleItemValue);
 117     JSArray* constructArray(ExecState*, const ArgList& values);
 118
 119     inline JSArray* asArray(JSValuePtr value)
 120     {
 121         ASSERT(asObject(value)->inherits(&JSArray::info));
 122         return static_cast<JSArray*>(asObject(value));
 123     }
 124
 125 } // namespace JSC
 126
 127 #endif // JSArray_h