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 #include "JSVariableObject.h"
  29 #include "SymbolTable.h"
  30 #include "Nodes.h"
  31 #include "JSObject.h"
  32
  33 namespace JSC {
  34
  35     class FunctionBodyNode;
  36     class FunctionPrototype;
  37     class JSActivation;
  38     class JSGlobalObject;
  39
  40     class JSFunction : public InternalFunction {
  41         friend class JIT;
  42         friend class VPtrSet;
  43
  44         typedef InternalFunction Base;
  45
  46         JSFunction(PassRefPtr<Structure> structure)
  47             : InternalFunction(structure)
  48         {
  49             clearScopeChain();
  50         }
  51
  52     public:
  53         JSFunction(ExecState*, PassRefPtr<Structure>, int length, const Identifier&, NativeFunction);
  54         JSFunction(ExecState*, const Identifier&, FunctionBodyNode*, ScopeChainNode*);
  55         ~JSFunction();
  56
  57         virtual bool getOwnPropertySlot(ExecState*, const Identifier&, PropertySlot&);
  58         virtual void put(ExecState*, const Identifier& propertyName, JSValue, PutPropertySlot&);
  59         virtual bool deleteProperty(ExecState*, const Identifier& propertyName);
  60
  61         JSObject* construct(ExecState*, const ArgList&);
  62         JSValue call(ExecState*, JSValue thisValue, const ArgList&);
  63
  64         void setScope(const ScopeChain& scopeChain) { setScopeChain(scopeChain); }
  65         ScopeChain& scope() { return scopeChain(); }
  66
  67         void setBody(FunctionBodyNode* body) { m_body = body; }
  68         void setBody(PassRefPtr<FunctionBodyNode> body) { m_body = body; }
  69         FunctionBodyNode* body() const { return m_body.get(); }
  70
  71         virtual void mark();
  72
  73         static JS_EXPORTDATA const ClassInfo info;
  74
  75         static PassRefPtr<Structure> createStructure(JSValue prototype)
  76         {
  77             return Structure::create(prototype, TypeInfo(ObjectType, ImplementsHasInstance));
  78         }
  79
  80 #if ENABLE(JIT)
  81         bool isHostFunction() const { return m_body && m_body->isHostFunction(); }
  82 #else
  83         bool isHostFunction() const { return false; }
  84 #endif
  85         NativeFunction nativeFunction()
  86         {
  87             return *reinterpret_cast<NativeFunction*>(m_data);
  88         }
  89
  90         virtual ConstructType getConstructData(ConstructData&);
  91         virtual CallType getCallData(CallData&);
  92
  93     private:
  94         virtual const ClassInfo* classInfo() const { return &info; }
  95
  96         static JSValue argumentsGetter(ExecState*, const Identifier&, const PropertySlot&);
  97         static JSValue callerGetter(ExecState*, const Identifier&, const PropertySlot&);
  98         static JSValue lengthGetter(ExecState*, const Identifier&, const PropertySlot&);
  99
 100         RefPtr<FunctionBodyNode> m_body;
 101         ScopeChain& scopeChain()
 102         {
 103             ASSERT(!isHostFunction());
 104             return *reinterpret_cast<ScopeChain*>(m_data);
 105         }
 106         void clearScopeChain()
 107         {
 108             ASSERT(!isHostFunction());
 109             new (m_data) ScopeChain(NoScopeChain());
 110         }
 111         void setScopeChain(ScopeChainNode* sc)
 112         {
 113             ASSERT(!isHostFunction());
 114             new (m_data) ScopeChain(sc);
 115         }
 116         void setScopeChain(const ScopeChain& sc)
 117         {
 118             ASSERT(!isHostFunction());
 119             *reinterpret_cast<ScopeChain*>(m_data) = sc;
 120         }
 121         void setNativeFunction(NativeFunction func)
 122         {
 123             *reinterpret_cast<NativeFunction*>(m_data) = func;
 124         }
 125         unsigned char m_data[sizeof(void*)];
 126     };
 127
 128     JSFunction* asFunction(JSValue);
 129
 130     inline JSFunction* asFunction(JSValue value)
 131     {
 132         ASSERT(asObject(value)->inherits(&JSFunction::info));
 133         return static_cast<JSFunction*>(asObject(value));
 134     }
 135
 136 } // namespace JSC
 137
 138 #endif // JSFunction_h