Merge WebKit at r75315: Initial merge by git.

Change-Id: I570314b346ce101c935ed22a626b48c2af266b84

1 files changed, 343 insertions, 0 deletions

diff --git a/Source/JavaScriptCore/runtime/JSFunction.cpp b/Source/JavaScriptCore/runtime/JSFunction.cpp
new file mode 100644
index 0000000..99f8e6f
--- /dev/null
+++ b/Source/JavaScriptCore/runtime/JSFunction.cpp
@@ -0,0 +1,343 @@
+/*
+ *  Copyright (C) 1999-2002 Harri Porten (porten@kde.org)
+ *  Copyright (C) 2001 Peter Kelly (pmk@post.com)
+ *  Copyright (C) 2003, 2004, 2005, 2006, 2007, 2008, 2009 Apple Inc. All rights reserved.
+ *  Copyright (C) 2007 Cameron Zwarich (cwzwarich@uwaterloo.ca)
+ *  Copyright (C) 2007 Maks Orlovich
+ *
+ *  This library is free software; you can redistribute it and/or
+ *  modify it under the terms of the GNU Library General Public
+ *  License as published by the Free Software Foundation; either
+ *  version 2 of the License, or (at your option) any later version.
+ *
+ *  This library is distributed in the hope that it will be useful,
+ *  but WITHOUT ANY WARRANTY; without even the implied warranty of
+ *  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
+ *  Library General Public License for more details.
+ *
+ *  You should have received a copy of the GNU Library General Public License
+ *  along with this library; see the file COPYING.LIB.  If not, write to
+ *  the Free Software Foundation, Inc., 51 Franklin Street, Fifth Floor,
+ *  Boston, MA 02110-1301, USA.
+ *
+ */
+
+#include "config.h"
+#include "JSFunction.h"
+
+#include "CodeBlock.h"
+#include "CommonIdentifiers.h"
+#include "CallFrame.h"
+#include "ExceptionHelpers.h"
+#include "FunctionPrototype.h"
+#include "JSGlobalObject.h"
+#include "JSNotAnObject.h"
+#include "Interpreter.h"
+#include "ObjectPrototype.h"
+#include "Parser.h"
+#include "PropertyNameArray.h"
+#include "ScopeChainMark.h"
+
+using namespace WTF;
+using namespace Unicode;
+
+namespace JSC {
+#if ENABLE(JIT)
+EncodedJSValue JSC_HOST_CALL callHostFunctionAsConstructor(ExecState* exec)
+{
+    return throwVMError(exec, createNotAConstructorError(exec, exec->callee()));
+}
+#endif
+
+ASSERT_CLASS_FITS_IN_CELL(JSFunction);
+
+const ClassInfo JSFunction::info = { "Function", 0, 0, 0 };
+
+bool JSFunction::isHostFunctionNonInline() const
+{
+    return isHostFunction();
+}
+
+JSFunction::JSFunction(NonNullPassRefPtr<Structure> structure)
+    : Base(structure)
+    , m_executable(adoptRef(new VPtrHackExecutable()))
+    , m_scopeChain(NoScopeChain())
+{
+}
+
+#if ENABLE(JIT)
+JSFunction::JSFunction(ExecState* exec, JSGlobalObject* globalObject, NonNullPassRefPtr<Structure> structure, int length, const Identifier& name, PassRefPtr<NativeExecutable> thunk)
+    : Base(globalObject, structure)
+    , m_executable(thunk)
+    , m_scopeChain(globalObject->globalScopeChain())
+{
+    putDirect(exec->globalData().propertyNames->name, jsString(exec, name.isNull() ? "" : name.ustring()), DontDelete | ReadOnly | DontEnum);
+    putDirect(exec->propertyNames().length, jsNumber(length), DontDelete | ReadOnly | DontEnum);
+}
+#endif
+
+JSFunction::JSFunction(ExecState* exec, JSGlobalObject* globalObject, NonNullPassRefPtr<Structure> structure, int length, const Identifier& name, NativeFunction func)
+    : Base(globalObject, structure)
+#if ENABLE(JIT)
+    , m_executable(exec->globalData().getHostFunction(func))
+#endif
+    , m_scopeChain(globalObject->globalScopeChain())
+{
+    putDirect(exec->globalData().propertyNames->name, jsString(exec, name.isNull() ? "" : name.ustring()), DontDelete | ReadOnly | DontEnum);
+#if ENABLE(JIT)
+    putDirect(exec->propertyNames().length, jsNumber(length), DontDelete | ReadOnly | DontEnum);
+#else
+    UNUSED_PARAM(length);
+    UNUSED_PARAM(func);
+    ASSERT_NOT_REACHED();
+#endif
+}
+
+JSFunction::JSFunction(ExecState* exec, NonNullPassRefPtr<FunctionExecutable> executable, ScopeChainNode* scopeChainNode)
+    : Base(scopeChainNode->globalObject, scopeChainNode->globalObject->functionStructure())
+    , m_executable(executable)
+    , m_scopeChain(scopeChainNode)
+{
+    const Identifier& name = static_cast<FunctionExecutable*>(m_executable.get())->name();
+    putDirect(exec->globalData().propertyNames->name, jsString(exec, name.isNull() ? "" : name.ustring()), DontDelete | ReadOnly | DontEnum);
+}
+
+JSFunction::~JSFunction()
+{
+    ASSERT(vptr() == JSGlobalData::jsFunctionVPtr);
+
+    // JIT code for other functions may have had calls linked directly to the code for this function; these links
+    // are based on a check for the this pointer value for this JSFunction - which will no longer be valid once
+    // this memory is freed and may be reused (potentially for another, different JSFunction).
+    if (!isHostFunction()) {
+#if ENABLE(JIT_OPTIMIZE_CALL)
+        ASSERT(m_executable);
+        if (jsExecutable()->isGeneratedForCall())
+            jsExecutable()->generatedBytecodeForCall().unlinkCallers();
+        if (jsExecutable()->isGeneratedForConstruct())
+            jsExecutable()->generatedBytecodeForConstruct().unlinkCallers();
+#endif
+    }
+}
+
+static const char* StrictModeCallerAccessError = "Cannot access caller property of a strict mode function";
+static const char* StrictModeArgumentsAccessError = "Cannot access arguments property of a strict mode function";
+
+static void createDescriptorForThrowingProperty(ExecState* exec, PropertyDescriptor& descriptor, const char* message)
+{
+    JSValue thrower = createTypeErrorFunction(exec, message);
+    descriptor.setAccessorDescriptor(thrower, thrower, DontEnum | DontDelete | Getter | Setter);
+}
+
+const UString& JSFunction::name(ExecState* exec)
+{
+    return asString(getDirect(exec->globalData().propertyNames->name))->tryGetValue();
+}
+
+const UString JSFunction::displayName(ExecState* exec)
+{
+    JSValue displayName = getDirect(exec->globalData().propertyNames->displayName);
+    
+    if (displayName && isJSString(&exec->globalData(), displayName))
+        return asString(displayName)->tryGetValue();
+    
+    return UString();
+}
+
+const UString JSFunction::calculatedDisplayName(ExecState* exec)
+{
+    const UString explicitName = displayName(exec);
+    
+    if (!explicitName.isEmpty())
+        return explicitName;
+    
+    return name(exec);
+}
+
+void JSFunction::markChildren(MarkStack& markStack)
+{
+    Base::markChildren(markStack);
+    if (!isHostFunction()) {
+        jsExecutable()->markAggregate(markStack);
+        scope().markAggregate(markStack);
+    }
+}
+
+CallType JSFunction::getCallData(CallData& callData)
+{
+#if ENABLE(JIT)
+    if (isHostFunction()) {
+        callData.native.function = nativeFunction();
+        return CallTypeHost;
+    }
+#endif
+    callData.js.functionExecutable = jsExecutable();
+    callData.js.scopeChain = scope().node();
+    return CallTypeJS;
+}
+
+JSValue JSFunction::argumentsGetter(ExecState* exec, JSValue slotBase, const Identifier&)
+{
+    JSFunction* thisObj = asFunction(slotBase);
+    ASSERT(!thisObj->isHostFunction());
+    return exec->interpreter()->retrieveArguments(exec, thisObj);
+}
+
+JSValue JSFunction::callerGetter(ExecState* exec, JSValue slotBase, const Identifier&)
+{
+    JSFunction* thisObj = asFunction(slotBase);
+    ASSERT(!thisObj->isHostFunction());
+    return exec->interpreter()->retrieveCaller(exec, thisObj);
+}
+
+JSValue JSFunction::lengthGetter(ExecState*, JSValue slotBase, const Identifier&)
+{
+    JSFunction* thisObj = asFunction(slotBase);
+    ASSERT(!thisObj->isHostFunction());
+    return jsNumber(thisObj->jsExecutable()->parameterCount());
+}
+
+bool JSFunction::getOwnPropertySlot(ExecState* exec, const Identifier& propertyName, PropertySlot& slot)
+{
+    if (isHostFunction())
+        return Base::getOwnPropertySlot(exec, propertyName, slot);
+
+    if (propertyName == exec->propertyNames().prototype) {
+        JSValue* location = getDirectLocation(propertyName);
+
+        if (!location) {
+            JSObject* prototype = new (exec) JSObject(scope().globalObject()->emptyObjectStructure());
+            prototype->putDirect(exec->propertyNames().constructor, this, DontEnum);
+            putDirect(exec->propertyNames().prototype, prototype, DontDelete | DontEnum);
+            location = getDirectLocation(propertyName);
+        }
+
+        slot.setValueSlot(this, location, offsetForLocation(location));
+    }
+
+    if (propertyName == exec->propertyNames().arguments) {
+        if (jsExecutable()->isStrictMode()) {
+            throwTypeError(exec, "Can't access arguments object of a strict mode function");
+            slot.setValue(jsNull());
+            return true;
+        }
+   
+        slot.setCacheableCustom(this, argumentsGetter);
+        return true;
+    }
+
+    if (propertyName == exec->propertyNames().length) {
+        slot.setCacheableCustom(this, lengthGetter);
+        return true;
+    }
+
+    if (propertyName == exec->propertyNames().caller) {
+        if (jsExecutable()->isStrictMode()) {
+            throwTypeError(exec, StrictModeCallerAccessError);
+            slot.setValue(jsNull());
+            return true;
+        }
+        slot.setCacheableCustom(this, callerGetter);
+        return true;
+    }
+
+    return Base::getOwnPropertySlot(exec, propertyName, slot);
+}
+
+bool JSFunction::getOwnPropertyDescriptor(ExecState* exec, const Identifier& propertyName, PropertyDescriptor& descriptor)
+{
+    if (isHostFunction())
+        return Base::getOwnPropertyDescriptor(exec, propertyName, descriptor);
+    
+    if (propertyName == exec->propertyNames().prototype) {
+        PropertySlot slot;
+        getOwnPropertySlot(exec, propertyName, slot);
+        return Base::getOwnPropertyDescriptor(exec, propertyName, descriptor);
+    }
+    
+    if (propertyName == exec->propertyNames().arguments) {
+        if (jsExecutable()->isStrictMode())
+            createDescriptorForThrowingProperty(exec, descriptor, StrictModeArgumentsAccessError);
+        else
+            descriptor.setDescriptor(exec->interpreter()->retrieveArguments(exec, this), ReadOnly | DontEnum | DontDelete);
+        return true;
+    }
+    
+    if (propertyName == exec->propertyNames().length) {
+        descriptor.setDescriptor(jsNumber(jsExecutable()->parameterCount()), ReadOnly | DontEnum | DontDelete);
+        return true;
+    }
+    
+    if (propertyName == exec->propertyNames().caller) {
+        if (jsExecutable()->isStrictMode())
+            createDescriptorForThrowingProperty(exec, descriptor, StrictModeCallerAccessError);
+        else
+            descriptor.setDescriptor(exec->interpreter()->retrieveCaller(exec, this), ReadOnly | DontEnum | DontDelete);
+        return true;
+    }
+    
+    return Base::getOwnPropertyDescriptor(exec, propertyName, descriptor);
+}
+
+void JSFunction::getOwnPropertyNames(ExecState* exec, PropertyNameArray& propertyNames, EnumerationMode mode)
+{
+    if (!isHostFunction() && (mode == IncludeDontEnumProperties)) {
+        // Make sure prototype has been reified.
+        PropertySlot slot;
+        getOwnPropertySlot(exec, exec->propertyNames().prototype, slot);
+
+        propertyNames.add(exec->propertyNames().arguments);
+        propertyNames.add(exec->propertyNames().callee);
+        propertyNames.add(exec->propertyNames().caller);
+        propertyNames.add(exec->propertyNames().length);
+    }
+    Base::getOwnPropertyNames(exec, propertyNames, mode);
+}
+
+void JSFunction::put(ExecState* exec, const Identifier& propertyName, JSValue value, PutPropertySlot& slot)
+{
+    if (isHostFunction()) {
+        Base::put(exec, propertyName, value, slot);
+        return;
+    }
+    if (propertyName == exec->propertyNames().prototype) {
+        // Make sure prototype has been reified, such that it can only be overwritten
+        // following the rules set out in ECMA-262 8.12.9.
+        PropertySlot slot;
+        getOwnPropertySlot(exec, propertyName, slot);
+    }
+    if (jsExecutable()->isStrictMode()) {
+        if (propertyName == exec->propertyNames().arguments) {
+            throwTypeError(exec, StrictModeArgumentsAccessError);
+            return;
+        }
+        if (propertyName == exec->propertyNames().caller) {
+            throwTypeError(exec, StrictModeCallerAccessError);
+            return;
+        }
+    }
+    if (propertyName == exec->propertyNames().arguments || propertyName == exec->propertyNames().length)
+        return;
+    Base::put(exec, propertyName, value, slot);
+}
+
+bool JSFunction::deleteProperty(ExecState* exec, const Identifier& propertyName)
+{
+    if (isHostFunction())
+        return Base::deleteProperty(exec, propertyName);
+    if (propertyName == exec->propertyNames().arguments || propertyName == exec->propertyNames().length)
+        return false;
+    return Base::deleteProperty(exec, propertyName);
+}
+
+// ECMA 13.2.2 [[Construct]]
+ConstructType JSFunction::getConstructData(ConstructData& constructData)
+{
+    if (isHostFunction())
+        return ConstructTypeNone;
+    constructData.js.functionExecutable = jsExecutable();
+    constructData.js.scopeChain = scope().node();
+    return ConstructTypeJS;
+}
+
+} // namespace JSC