runtime/JSFunction.cpp

   1 /*
   2  *  Copyright (C) 1999-2002 Harri Porten (porten@kde.org)
   3  *  Copyright (C) 2001 Peter Kelly (pmk@post.com)
   4  *  Copyright (C) 2003, 2004, 2005, 2006, 2007, 2008, 2009 Apple Inc. All rights reserved.
   5  *  Copyright (C) 2007 Cameron Zwarich (cwzwarich@uwaterloo.ca)
   6  *  Copyright (C) 2007 Maks Orlovich
   7  *
   8  *  This library is free software; you can redistribute it and/or
   9  *  modify it under the terms of the GNU Library General Public
  10  *  License as published by the Free Software Foundation; either
  11  *  version 2 of the License, or (at your option) any later version.
  12  *
  13  *  This library is distributed in the hope that it will be useful,
  14  *  but WITHOUT ANY WARRANTY; without even the implied warranty of
  15  *  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
  16  *  Library General Public License for more details.
  17  *
  18  *  You should have received a copy of the GNU Library General Public License
  19  *  along with this library; see the file COPYING.LIB.  If not, write to
  20  *  the Free Software Foundation, Inc., 51 Franklin Street, Fifth Floor,
  21  *  Boston, MA 02110-1301, USA.
  22  *
  23  */
  24
  25 #include "config.h"
  26 #include "JSFunction.h"
  27
  28 #include "CodeBlock.h"
  29 #include "CommonIdentifiers.h"
  30 #include "CallFrame.h"
  31 #include "FunctionPrototype.h"
  32 #include "JSGlobalObject.h"
  33 #include "Interpreter.h"
  34 #include "ObjectPrototype.h"
  35 #include "Parser.h"
  36 #include "PropertyNameArray.h"
  37 #include "ScopeChainMark.h"
  38
  39 using namespace WTF;
  40 using namespace Unicode;
  41
  42 namespace JSC {
  43
  44 ASSERT_CLASS_FITS_IN_CELL(JSFunction);
  45
  46 const ClassInfo JSFunction::info = { "Function", &InternalFunction::info, 0, 0 };
  47
  48 bool JSFunction::isHostFunctionNonInline() const
  49 {
  50     return isHostFunction();
  51 }
  52
  53 JSFunction::JSFunction(NonNullPassRefPtr<Structure> structure)
  54     : Base(structure)
  55     , m_executable(adoptRef(new VPtrHackExecutable()))
  56 {
  57 }
  58
  59 JSFunction::JSFunction(ExecState* exec, NonNullPassRefPtr<Structure> structure, int length, const Identifier& name, NativeFunction func)
  60     : Base(&exec->globalData(), structure, name)
  61 #if ENABLE(JIT)
  62     , m_executable(adoptRef(new NativeExecutable(exec)))
  63 #endif
  64 {
  65 #if ENABLE(JIT)
  66     setNativeFunction(func);
  67     putDirect(exec->propertyNames().length, jsNumber(exec, length), DontDelete | ReadOnly | DontEnum);
  68 #else
  69     UNUSED_PARAM(length);
  70     UNUSED_PARAM(func);
  71     ASSERT_NOT_REACHED();
  72 #endif
  73 }
  74
  75 JSFunction::JSFunction(ExecState* exec, NonNullPassRefPtr<FunctionExecutable> executable, ScopeChainNode* scopeChainNode)
  76     : Base(&exec->globalData(), exec->lexicalGlobalObject()->functionStructure(), executable->name())
  77     , m_executable(executable)
  78 {
  79     setScopeChain(scopeChainNode);
  80 }
  81
  82 JSFunction::~JSFunction()
  83 {
  84     ASSERT(vptr() == JSGlobalData::jsFunctionVPtr);
  85
  86     // JIT code for other functions may have had calls linked directly to the code for this function; these links
  87     // are based on a check for the this pointer value for this JSFunction - which will no longer be valid once
  88     // this memory is freed and may be reused (potentially for another, different JSFunction).
  89     if (!isHostFunction()) {
  90 #if ENABLE(JIT_OPTIMIZE_CALL)
  91         ASSERT(m_executable);
  92         if (jsExecutable()->isGenerated())
  93             jsExecutable()->generatedBytecode().unlinkCallers();
  94 #endif
  95         scopeChain().~ScopeChain(); // FIXME: Don't we need to do this in the interpreter too?
  96     }
  97 }
  98
  99 void JSFunction::markChildren(MarkStack& markStack)
 100 {
 101     Base::markChildren(markStack);
 102     if (!isHostFunction()) {
 103         jsExecutable()->markAggregate(markStack);
 104         scopeChain().markAggregate(markStack);
 105     }
 106 }
 107
 108 CallType JSFunction::getCallData(CallData& callData)
 109 {
 110     if (isHostFunction()) {
 111         callData.native.function = nativeFunction();
 112         return CallTypeHost;
 113     }
 114     callData.js.functionExecutable = jsExecutable();
 115     callData.js.scopeChain = scopeChain().node();
 116     return CallTypeJS;
 117 }
 118
 119 JSValue JSFunction::call(ExecState* exec, JSValue thisValue, const ArgList& args)
 120 {
 121     ASSERT(!isHostFunction());
 122     return exec->interpreter()->execute(jsExecutable(), exec, this, thisValue.toThisObject(exec), args, scopeChain().node(), exec->exceptionSlot());
 123 }
 124
 125 JSValue JSFunction::argumentsGetter(ExecState* exec, const Identifier&, const PropertySlot& slot)
 126 {
 127     JSFunction* thisObj = asFunction(slot.slotBase());
 128     ASSERT(!thisObj->isHostFunction());
 129     return exec->interpreter()->retrieveArguments(exec, thisObj);
 130 }
 131
 132 JSValue JSFunction::callerGetter(ExecState* exec, const Identifier&, const PropertySlot& slot)
 133 {
 134     JSFunction* thisObj = asFunction(slot.slotBase());
 135     ASSERT(!thisObj->isHostFunction());
 136     return exec->interpreter()->retrieveCaller(exec, thisObj);
 137 }
 138
 139 JSValue JSFunction::lengthGetter(ExecState* exec, const Identifier&, const PropertySlot& slot)
 140 {
 141     JSFunction* thisObj = asFunction(slot.slotBase());
 142     ASSERT(!thisObj->isHostFunction());
 143     return jsNumber(exec, thisObj->jsExecutable()->parameterCount());
 144 }
 145
 146 bool JSFunction::getOwnPropertySlot(ExecState* exec, const Identifier& propertyName, PropertySlot& slot)
 147 {
 148     if (isHostFunction())
 149         return Base::getOwnPropertySlot(exec, propertyName, slot);
 150
 151     if (propertyName == exec->propertyNames().prototype) {
 152         JSValue* location = getDirectLocation(propertyName);
 153
 154         if (!location) {
 155             JSObject* prototype = new (exec) JSObject(scopeChain().globalObject()->emptyObjectStructure());
 156             prototype->putDirect(exec->propertyNames().constructor, this, DontEnum);
 157             putDirect(exec->propertyNames().prototype, prototype, DontDelete);
 158             location = getDirectLocation(propertyName);
 159         }
 160
 161         slot.setValueSlot(this, location, offsetForLocation(location));
 162     }
 163
 164     if (propertyName == exec->propertyNames().arguments) {
 165         slot.setCustom(this, argumentsGetter);
 166         return true;
 167     }
 168
 169     if (propertyName == exec->propertyNames().length) {
 170         slot.setCustom(this, lengthGetter);
 171         return true;
 172     }
 173
 174     if (propertyName == exec->propertyNames().caller) {
 175         slot.setCustom(this, callerGetter);
 176         return true;
 177     }
 178
 179     return Base::getOwnPropertySlot(exec, propertyName, slot);
 180 }
 181
 182     bool JSFunction::getOwnPropertyDescriptor(ExecState* exec, const Identifier& propertyName, PropertyDescriptor& descriptor)
 183     {
 184         if (isHostFunction())
 185             return Base::getOwnPropertyDescriptor(exec, propertyName, descriptor);
 186
 187         if (propertyName == exec->propertyNames().prototype) {
 188             PropertySlot slot;
 189             getOwnPropertySlot(exec, propertyName, slot);
 190             return Base::getOwnPropertyDescriptor(exec, propertyName, descriptor);
 191         }
 192
 193         if (propertyName == exec->propertyNames().arguments) {
 194             descriptor.setDescriptor(exec->interpreter()->retrieveArguments(exec, this), ReadOnly | DontEnum | DontDelete);
 195             return true;
 196         }
 197
 198         if (propertyName == exec->propertyNames().length) {
 199             descriptor.setDescriptor(jsNumber(exec, jsExecutable()->parameterCount()), ReadOnly | DontEnum | DontDelete);
 200             return true;
 201         }
 202
 203         if (propertyName == exec->propertyNames().caller) {
 204             descriptor.setDescriptor(exec->interpreter()->retrieveCaller(exec, this), ReadOnly | DontEnum | DontDelete);
 205             return true;
 206         }
 207
 208         return Base::getOwnPropertyDescriptor(exec, propertyName, descriptor);
 209     }
 210
 211 void JSFunction::getOwnPropertyNames(ExecState* exec, PropertyNameArray& propertyNames, EnumerationMode mode)
 212 {
 213     if (!isHostFunction() && (mode == IncludeDontEnumProperties)) {
 214         propertyNames.add(exec->propertyNames().arguments);
 215         propertyNames.add(exec->propertyNames().callee);
 216         propertyNames.add(exec->propertyNames().caller);
 217         propertyNames.add(exec->propertyNames().length);
 218     }
 219     Base::getOwnPropertyNames(exec, propertyNames, mode);
 220 }
 221
 222 void JSFunction::put(ExecState* exec, const Identifier& propertyName, JSValue value, PutPropertySlot& slot)
 223 {
 224     if (isHostFunction()) {
 225         Base::put(exec, propertyName, value, slot);
 226         return;
 227     }
 228     if (propertyName == exec->propertyNames().arguments || propertyName == exec->propertyNames().length)
 229         return;
 230     Base::put(exec, propertyName, value, slot);
 231 }
 232
 233 bool JSFunction::deleteProperty(ExecState* exec, const Identifier& propertyName)
 234 {
 235     if (isHostFunction())
 236         return Base::deleteProperty(exec, propertyName);
 237     if (propertyName == exec->propertyNames().arguments || propertyName == exec->propertyNames().length)
 238         return false;
 239     return Base::deleteProperty(exec, propertyName);
 240 }
 241
 242 // ECMA 13.2.2 [[Construct]]
 243 ConstructType JSFunction::getConstructData(ConstructData& constructData)
 244 {
 245     if (isHostFunction())
 246         return ConstructTypeNone;
 247     constructData.js.functionExecutable = jsExecutable();
 248     constructData.js.scopeChain = scopeChain().node();
 249     return ConstructTypeJS;
 250 }
 251
 252 JSObject* JSFunction::construct(ExecState* exec, const ArgList& args)
 253 {
 254     ASSERT(!isHostFunction());
 255     Structure* structure;
 256     JSValue prototype = get(exec, exec->propertyNames().prototype);
 257     if (prototype.isObject())
 258         structure = asObject(prototype)->inheritorID();
 259     else
 260         structure = exec->lexicalGlobalObject()->emptyObjectStructure();
 261     JSObject* thisObj = new (exec) JSObject(structure);
 262
 263     JSValue result = exec->interpreter()->execute(jsExecutable(), exec, this, thisObj, args, scopeChain().node(), exec->exceptionSlot());
 264     if (exec->hadException() || !result.isObject())
 265         return thisObj;
 266     return asObject(result);
 267 }
 268
 269 } // namespace JSC