runtime/JSFunction.h

   1 /*
   2  *  Copyright (C) 1999-2000 Harri Porten (porten@kde.org)
   3  *  Copyright (C) 2003, 2006, 2007, 2008, 2009 Apple Inc. All rights reserved.
   4  *  Copyright (C) 2007 Cameron Zwarich (cwzwarich@uwaterloo.ca)
   5  *  Copyright (C) 2007 Maks Orlovich
   6  *
   7  *  This library is free software; you can redistribute it and/or
   8  *  modify it under the terms of the GNU Library General Public
   9  *  License as published by the Free Software Foundation; either
  10  *  version 2 of the License, or (at your option) any later version.
  11  *
  12  *  This library is distributed in the hope that it will be useful,
  13  *  but WITHOUT ANY WARRANTY; without even the implied warranty of
  14  *  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
  15  *  Library General Public License for more details.
  16  *
  17  *  You should have received a copy of the GNU Library General Public License
  18  *  along with this library; see the file COPYING.LIB.  If not, write to
  19  *  the Free Software Foundation, Inc., 51 Franklin Street, Fifth Floor,
  20  *  Boston, MA 02110-1301, USA.
  21  *
  22  */
  23
  24 #ifndef JSFunction_h
  25 #define JSFunction_h
  26
  27 #include "InternalFunction.h"
  28
  29 namespace JSC {
  30
  31     class ExecutableBase;
  32     class FunctionExecutable;
  33     class FunctionPrototype;
  34     class JSActivation;
  35     class JSGlobalObject;
  36     class NativeExecutable;
  37
  38     class JSFunction : public InternalFunction {
  39         friend class JIT;
  40         friend class JSGlobalData;
  41
  42         typedef InternalFunction Base;
  43
  44     public:
  45         JSFunction(ExecState*, NonNullPassRefPtr<Structure>, int length, const Identifier&, NativeFunction);
  46         JSFunction(ExecState*, NonNullPassRefPtr<Structure>, int length, const Identifier&, NativeExecutable*, NativeFunction);
  47         JSFunction(ExecState*, NonNullPassRefPtr<FunctionExecutable>, ScopeChainNode*);
  48         virtual ~JSFunction();
  49
  50         JSObject* construct(ExecState*, const ArgList&);
  51         JSValue call(ExecState*, JSValue thisValue, const ArgList&);
  52
  53         void setScope(const ScopeChain& scopeChain) { setScopeChain(scopeChain); }
  54         ScopeChain& scope() { return scopeChain(); }
  55
  56         ExecutableBase* executable() const { return m_executable.get(); }
  57
  58         // To call either of these methods include Executable.h
  59         inline bool isHostFunction() const;
  60         FunctionExecutable* jsExecutable() const;
  61
  62         static JS_EXPORTDATA const ClassInfo info;
  63
  64         static PassRefPtr<Structure> createStructure(JSValue prototype)
  65         {
  66             return Structure::create(prototype, TypeInfo(ObjectType, StructureFlags), AnonymousSlotCount);
  67         }
  68
  69         NativeFunction nativeFunction()
  70         {
  71             return *WTF::bitwise_cast<NativeFunction*>(m_data);
  72         }
  73
  74         virtual ConstructType getConstructData(ConstructData&);
  75         virtual CallType getCallData(CallData&);
  76
  77     protected:
  78         const static unsigned StructureFlags = OverridesGetOwnPropertySlot | ImplementsHasInstance | OverridesMarkChildren | OverridesGetPropertyNames | InternalFunction::StructureFlags;
  79
  80     private:
  81         JSFunction(NonNullPassRefPtr<Structure>);
  82
  83         bool isHostFunctionNonInline() const;
  84
  85         virtual bool getOwnPropertySlot(ExecState*, const Identifier&, PropertySlot&);
  86         virtual bool getOwnPropertyDescriptor(ExecState*, const Identifier&, PropertyDescriptor&);
  87         virtual void getOwnPropertyNames(ExecState*, PropertyNameArray&, EnumerationMode mode = ExcludeDontEnumProperties);
  88         virtual void put(ExecState*, const Identifier& propertyName, JSValue, PutPropertySlot&);
  89         virtual bool deleteProperty(ExecState*, const Identifier& propertyName);
  90
  91         virtual void markChildren(MarkStack&);
  92
  93         virtual const ClassInfo* classInfo() const { return &info; }
  94
  95         static JSValue argumentsGetter(ExecState*, JSValue, const Identifier&);
  96         static JSValue callerGetter(ExecState*, JSValue, const Identifier&);
  97         static JSValue lengthGetter(ExecState*, JSValue, const Identifier&);
  98
  99         RefPtr<ExecutableBase> m_executable;
 100         ScopeChain& scopeChain()
 101         {
 102             ASSERT(!isHostFunctionNonInline());
 103             return *WTF::bitwise_cast<ScopeChain*>(m_data);
 104         }
 105         void clearScopeChain()
 106         {
 107             ASSERT(!isHostFunctionNonInline());
 108             new (m_data) ScopeChain(NoScopeChain());
 109         }
 110         void setScopeChain(ScopeChainNode* sc)
 111         {
 112             ASSERT(!isHostFunctionNonInline());
 113             new (m_data) ScopeChain(sc);
 114         }
 115         void setScopeChain(const ScopeChain& sc)
 116         {
 117             ASSERT(!isHostFunctionNonInline());
 118             *WTF::bitwise_cast<ScopeChain*>(m_data) = sc;
 119         }
 120         void setNativeFunction(NativeFunction func)
 121         {
 122             *WTF::bitwise_cast<NativeFunction*>(m_data) = func;
 123         }
 124         unsigned char m_data[sizeof(void*)];
 125     };
 126
 127     JSFunction* asFunction(JSValue);
 128
 129     inline JSFunction* asFunction(JSValue value)
 130     {
 131         ASSERT(asObject(value)->inherits(&JSFunction::info));
 132         return static_cast<JSFunction*>(asObject(value));
 133     }
 134
 135 } // namespace JSC
 136
 137 #endif // JSFunction_h