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, NativeExecutable* thunk, NativeFunction func)
  60     : Base(&exec->globalData(), structure, name)
  61 #if ENABLE(JIT)
  62     , m_executable(thunk)
  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(thunk);
  70     UNUSED_PARAM(length);
  71     UNUSED_PARAM(func);
  72     ASSERT_NOT_REACHED();
  73 #endif
  74 }
  75
  76 JSFunction::JSFunction(ExecState* exec, NonNullPassRefPtr<Structure> structure, int length, const Identifier& name, NativeFunction func)
  77     : Base(&exec->globalData(), structure, name)
  78 #if ENABLE(JIT)
  79     , m_executable(exec->globalData().jitStubs->ctiNativeCallThunk())
  80 #endif
  81 {
  82 #if ENABLE(JIT)
  83     setNativeFunction(func);
  84     putDirect(exec->propertyNames().length, jsNumber(exec, length), DontDelete | ReadOnly | DontEnum);
  85 #else
  86     UNUSED_PARAM(length);
  87     UNUSED_PARAM(func);
  88     ASSERT_NOT_REACHED();
  89 #endif
  90 }
  91
  92 JSFunction::JSFunction(ExecState* exec, NonNullPassRefPtr<FunctionExecutable> executable, ScopeChainNode* scopeChainNode)
  93     : Base(&exec->globalData(), exec->lexicalGlobalObject()->functionStructure(), executable->name())
  94     , m_executable(executable)
  95 {
  96     setScopeChain(scopeChainNode);
  97 }
  98
  99 JSFunction::~JSFunction()
 100 {
 101     ASSERT(vptr() == JSGlobalData::jsFunctionVPtr);
 102
 103     // JIT code for other functions may have had calls linked directly to the code for this function; these links
 104     // are based on a check for the this pointer value for this JSFunction - which will no longer be valid once
 105     // this memory is freed and may be reused (potentially for another, different JSFunction).
 106     if (!isHostFunction()) {
 107 #if ENABLE(JIT_OPTIMIZE_CALL)
 108         ASSERT(m_executable);
 109         if (jsExecutable()->isGenerated())
 110             jsExecutable()->generatedBytecode().unlinkCallers();
 111 #endif
 112         scopeChain().~ScopeChain(); // FIXME: Don't we need to do this in the interpreter too?
 113     }
 114 }
 115
 116 void JSFunction::markChildren(MarkStack& markStack)
 117 {
 118     Base::markChildren(markStack);
 119     if (!isHostFunction()) {
 120         jsExecutable()->markAggregate(markStack);
 121         scopeChain().markAggregate(markStack);
 122     }
 123 }
 124
 125 CallType JSFunction::getCallData(CallData& callData)
 126 {
 127     if (isHostFunction()) {
 128         callData.native.function = nativeFunction();
 129         return CallTypeHost;
 130     }
 131     callData.js.functionExecutable = jsExecutable();
 132     callData.js.scopeChain = scopeChain().node();
 133     return CallTypeJS;
 134 }
 135
 136 JSValue JSFunction::call(ExecState* exec, JSValue thisValue, const ArgList& args)
 137 {
 138     ASSERT(!isHostFunction());
 139     return exec->interpreter()->execute(jsExecutable(), exec, this, thisValue.toThisObject(exec), args, scopeChain().node(), exec->exceptionSlot());
 140 }
 141
 142 JSValue JSFunction::argumentsGetter(ExecState* exec, JSValue slotBase, const Identifier&)
 143 {
 144     JSFunction* thisObj = asFunction(slotBase);
 145     ASSERT(!thisObj->isHostFunction());
 146     return exec->interpreter()->retrieveArguments(exec, thisObj);
 147 }
 148
 149 JSValue JSFunction::callerGetter(ExecState* exec, JSValue slotBase, const Identifier&)
 150 {
 151     JSFunction* thisObj = asFunction(slotBase);
 152     ASSERT(!thisObj->isHostFunction());
 153     return exec->interpreter()->retrieveCaller(exec, thisObj);
 154 }
 155
 156 JSValue JSFunction::lengthGetter(ExecState* exec, JSValue slotBase, const Identifier&)
 157 {
 158     JSFunction* thisObj = asFunction(slotBase);
 159     ASSERT(!thisObj->isHostFunction());
 160     return jsNumber(exec, thisObj->jsExecutable()->parameterCount());
 161 }
 162
 163 bool JSFunction::getOwnPropertySlot(ExecState* exec, const Identifier& propertyName, PropertySlot& slot)
 164 {
 165     if (isHostFunction())
 166         return Base::getOwnPropertySlot(exec, propertyName, slot);
 167
 168     if (propertyName == exec->propertyNames().prototype) {
 169         JSValue* location = getDirectLocation(propertyName);
 170
 171         if (!location) {
 172             JSObject* prototype = new (exec) JSObject(scopeChain().globalObject()->emptyObjectStructure());
 173             prototype->putDirect(exec->propertyNames().constructor, this, DontEnum);
 174             putDirect(exec->propertyNames().prototype, prototype, DontDelete);
 175             location = getDirectLocation(propertyName);
 176         }
 177
 178         slot.setValueSlot(this, location, offsetForLocation(location));
 179     }
 180
 181     if (propertyName == exec->propertyNames().arguments) {
 182         slot.setCacheableCustom(this, argumentsGetter);
 183         return true;
 184     }
 185
 186     if (propertyName == exec->propertyNames().length) {
 187         slot.setCacheableCustom(this, lengthGetter);
 188         return true;
 189     }
 190
 191     if (propertyName == exec->propertyNames().caller) {
 192         slot.setCacheableCustom(this, callerGetter);
 193         return true;
 194     }
 195
 196     return Base::getOwnPropertySlot(exec, propertyName, slot);
 197 }
 198
 199     bool JSFunction::getOwnPropertyDescriptor(ExecState* exec, const Identifier& propertyName, PropertyDescriptor& descriptor)
 200     {
 201         if (isHostFunction())
 202             return Base::getOwnPropertyDescriptor(exec, propertyName, descriptor);
 203
 204         if (propertyName == exec->propertyNames().prototype) {
 205             PropertySlot slot;
 206             getOwnPropertySlot(exec, propertyName, slot);
 207             return Base::getOwnPropertyDescriptor(exec, propertyName, descriptor);
 208         }
 209
 210         if (propertyName == exec->propertyNames().arguments) {
 211             descriptor.setDescriptor(exec->interpreter()->retrieveArguments(exec, this), ReadOnly | DontEnum | DontDelete);
 212             return true;
 213         }
 214
 215         if (propertyName == exec->propertyNames().length) {
 216             descriptor.setDescriptor(jsNumber(exec, jsExecutable()->parameterCount()), ReadOnly | DontEnum | DontDelete);
 217             return true;
 218         }
 219
 220         if (propertyName == exec->propertyNames().caller) {
 221             descriptor.setDescriptor(exec->interpreter()->retrieveCaller(exec, this), ReadOnly | DontEnum | DontDelete);
 222             return true;
 223         }
 224
 225         return Base::getOwnPropertyDescriptor(exec, propertyName, descriptor);
 226     }
 227
 228 void JSFunction::getOwnPropertyNames(ExecState* exec, PropertyNameArray& propertyNames, EnumerationMode mode)
 229 {
 230     if (!isHostFunction() && (mode == IncludeDontEnumProperties)) {
 231         propertyNames.add(exec->propertyNames().arguments);
 232         propertyNames.add(exec->propertyNames().callee);
 233         propertyNames.add(exec->propertyNames().caller);
 234         propertyNames.add(exec->propertyNames().length);
 235     }
 236     Base::getOwnPropertyNames(exec, propertyNames, mode);
 237 }
 238
 239 void JSFunction::put(ExecState* exec, const Identifier& propertyName, JSValue value, PutPropertySlot& slot)
 240 {
 241     if (isHostFunction()) {
 242         Base::put(exec, propertyName, value, slot);
 243         return;
 244     }
 245     if (propertyName == exec->propertyNames().arguments || propertyName == exec->propertyNames().length)
 246         return;
 247     Base::put(exec, propertyName, value, slot);
 248 }
 249
 250 bool JSFunction::deleteProperty(ExecState* exec, const Identifier& propertyName)
 251 {
 252     if (isHostFunction())
 253         return Base::deleteProperty(exec, propertyName);
 254     if (propertyName == exec->propertyNames().arguments || propertyName == exec->propertyNames().length)
 255         return false;
 256     return Base::deleteProperty(exec, propertyName);
 257 }
 258
 259 // ECMA 13.2.2 [[Construct]]
 260 ConstructType JSFunction::getConstructData(ConstructData& constructData)
 261 {
 262     if (isHostFunction())
 263         return ConstructTypeNone;
 264     constructData.js.functionExecutable = jsExecutable();
 265     constructData.js.scopeChain = scopeChain().node();
 266     return ConstructTypeJS;
 267 }
 268
 269 JSObject* JSFunction::construct(ExecState* exec, const ArgList& args)
 270 {
 271     ASSERT(!isHostFunction());
 272     Structure* structure;
 273     JSValue prototype = get(exec, exec->propertyNames().prototype);
 274     if (prototype.isObject())
 275         structure = asObject(prototype)->inheritorID();
 276     else
 277         structure = exec->lexicalGlobalObject()->emptyObjectStructure();
 278     JSObject* thisObj = new (exec) JSObject(structure);
 279
 280     JSValue result = exec->interpreter()->execute(jsExecutable(), exec, this, thisObj, args, scopeChain().node(), exec->exceptionSlot());
 281     if (exec->hadException() || !result.isObject())
 282         return thisObj;
 283     return asObject(result);
 284 }
 285
 286 } // namespace JSC