Merge WebKit at r75315: Initial merge by git.

Change-Id: I570314b346ce101c935ed22a626b48c2af266b84

1 files changed, 352 insertions, 0 deletions

diff --git a/Source/JavaScriptCore/runtime/Arguments.cpp b/Source/JavaScriptCore/runtime/Arguments.cpp
new file mode 100644
index 0000000..39886a8
--- /dev/null
+++ b/Source/JavaScriptCore/runtime/Arguments.cpp
@@ -0,0 +1,352 @@
+/*
+ *  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 "Arguments.h"
+
+#include "JSActivation.h"
+#include "JSFunction.h"
+#include "JSGlobalObject.h"
+
+using namespace std;
+
+namespace JSC {
+
+ASSERT_CLASS_FITS_IN_CELL(Arguments);
+
+const ClassInfo Arguments::info = { "Arguments", 0, 0, 0 };
+
+Arguments::~Arguments()
+{
+    if (d->extraArguments != d->extraArgumentsFixedBuffer)
+        delete [] d->extraArguments;
+}
+
+void Arguments::markChildren(MarkStack& markStack)
+{
+    JSObject::markChildren(markStack);
+
+    if (d->registerArray)
+        markStack.appendValues(reinterpret_cast<JSValue*>(d->registerArray.get()), d->numParameters);
+
+    if (d->extraArguments) {
+        unsigned numExtraArguments = d->numArguments - d->numParameters;
+        markStack.appendValues(reinterpret_cast<JSValue*>(d->extraArguments), numExtraArguments);
+    }
+
+    markStack.append(d->callee);
+
+    if (d->activation)
+        markStack.append(d->activation);
+}
+
+void Arguments::copyToRegisters(ExecState* exec, Register* buffer, uint32_t maxSize)
+{
+    if (UNLIKELY(d->overrodeLength)) {
+        unsigned length = min(get(exec, exec->propertyNames().length).toUInt32(exec), maxSize);
+        for (unsigned i = 0; i < length; i++)
+            buffer[i] = get(exec, i);
+        return;
+    }
+
+    if (LIKELY(!d->deletedArguments)) {
+        unsigned parametersLength = min(min(d->numParameters, d->numArguments), maxSize);
+        unsigned i = 0;
+        for (; i < parametersLength; ++i)
+            buffer[i] = d->registers[d->firstParameterIndex + i].jsValue();
+        for (; i < d->numArguments; ++i)
+            buffer[i] = d->extraArguments[i - d->numParameters].jsValue();
+        return;
+    }
+    
+    unsigned parametersLength = min(min(d->numParameters, d->numArguments), maxSize);
+    unsigned i = 0;
+    for (; i < parametersLength; ++i) {
+        if (!d->deletedArguments[i])
+            buffer[i] = d->registers[d->firstParameterIndex + i].jsValue();
+        else
+            buffer[i] = get(exec, i);
+    }
+    for (; i < d->numArguments; ++i) {
+        if (!d->deletedArguments[i])
+            buffer[i] = d->extraArguments[i - d->numParameters].jsValue();
+        else
+            buffer[i] = get(exec, i);
+    }
+}
+
+void Arguments::fillArgList(ExecState* exec, MarkedArgumentBuffer& args)
+{
+    if (UNLIKELY(d->overrodeLength)) {
+        unsigned length = get(exec, exec->propertyNames().length).toUInt32(exec); 
+        for (unsigned i = 0; i < length; i++) 
+            args.append(get(exec, i)); 
+        return;
+    }
+
+    if (LIKELY(!d->deletedArguments)) {
+        if (LIKELY(!d->numParameters)) {
+            args.initialize(d->extraArguments, d->numArguments);
+            return;
+        }
+
+        if (d->numParameters == d->numArguments) {
+            args.initialize(&d->registers[d->firstParameterIndex], d->numArguments);
+            return;
+        }
+
+        unsigned parametersLength = min(d->numParameters, d->numArguments);
+        unsigned i = 0;
+        for (; i < parametersLength; ++i)
+            args.append(d->registers[d->firstParameterIndex + i].jsValue());
+        for (; i < d->numArguments; ++i)
+            args.append(d->extraArguments[i - d->numParameters].jsValue());
+        return;
+    }
+
+    unsigned parametersLength = min(d->numParameters, d->numArguments);
+    unsigned i = 0;
+    for (; i < parametersLength; ++i) {
+        if (!d->deletedArguments[i])
+            args.append(d->registers[d->firstParameterIndex + i].jsValue());
+        else
+            args.append(get(exec, i));
+    }
+    for (; i < d->numArguments; ++i) {
+        if (!d->deletedArguments[i])
+            args.append(d->extraArguments[i - d->numParameters].jsValue());
+        else
+            args.append(get(exec, i));
+    }
+}
+
+bool Arguments::getOwnPropertySlot(ExecState* exec, unsigned i, PropertySlot& slot)
+{
+    if (i < d->numArguments && (!d->deletedArguments || !d->deletedArguments[i])) {
+        if (i < d->numParameters) {
+            slot.setRegisterSlot(&d->registers[d->firstParameterIndex + i]);
+        } else
+            slot.setValue(d->extraArguments[i - d->numParameters].jsValue());
+        return true;
+    }
+
+    return JSObject::getOwnPropertySlot(exec, Identifier(exec, UString::number(i)), slot);
+}
+    
+void Arguments::createStrictModeCallerIfNecessary(ExecState* exec)
+{
+    if (d->overrodeCaller)
+        return;
+
+    d->overrodeCaller = true;
+    PropertyDescriptor descriptor;
+    JSValue thrower = createTypeErrorFunction(exec, "Unable to access caller of strict mode function");
+    descriptor.setAccessorDescriptor(thrower, thrower, DontEnum | DontDelete | Getter | Setter);
+    defineOwnProperty(exec, exec->propertyNames().caller, descriptor, false);
+}
+
+void Arguments::createStrictModeCalleeIfNecessary(ExecState* exec)
+{
+    if (d->overrodeCallee)
+        return;
+    
+    d->overrodeCallee = true;
+    PropertyDescriptor descriptor;
+    JSValue thrower = createTypeErrorFunction(exec, "Unable to access callee of strict mode function");
+    descriptor.setAccessorDescriptor(thrower, thrower, DontEnum | DontDelete | Getter | Setter);
+    defineOwnProperty(exec, exec->propertyNames().callee, descriptor, false);
+}
+
+bool Arguments::getOwnPropertySlot(ExecState* exec, const Identifier& propertyName, PropertySlot& slot)
+{
+    bool isArrayIndex;
+    unsigned i = propertyName.toArrayIndex(isArrayIndex);
+    if (isArrayIndex && i < d->numArguments && (!d->deletedArguments || !d->deletedArguments[i])) {
+        if (i < d->numParameters) {
+            slot.setRegisterSlot(&d->registers[d->firstParameterIndex + i]);
+        } else
+            slot.setValue(d->extraArguments[i - d->numParameters].jsValue());
+        return true;
+    }
+
+    if (propertyName == exec->propertyNames().length && LIKELY(!d->overrodeLength)) {
+        slot.setValue(jsNumber(d->numArguments));
+        return true;
+    }
+
+    if (propertyName == exec->propertyNames().callee && LIKELY(!d->overrodeCallee)) {
+        if (!d->isStrictMode) {
+            slot.setValue(d->callee);
+            return true;
+        }
+        createStrictModeCalleeIfNecessary(exec);
+    }
+
+    if (propertyName == exec->propertyNames().caller && d->isStrictMode)
+        createStrictModeCallerIfNecessary(exec);
+
+    return JSObject::getOwnPropertySlot(exec, propertyName, slot);
+}
+
+bool Arguments::getOwnPropertyDescriptor(ExecState* exec, const Identifier& propertyName, PropertyDescriptor& descriptor)
+{
+    bool isArrayIndex;
+    unsigned i = propertyName.toArrayIndex(isArrayIndex);
+    if (isArrayIndex && i < d->numArguments && (!d->deletedArguments || !d->deletedArguments[i])) {
+        if (i < d->numParameters) {
+            descriptor.setDescriptor(d->registers[d->firstParameterIndex + i].jsValue(), DontEnum);
+        } else
+            descriptor.setDescriptor(d->extraArguments[i - d->numParameters].jsValue(), DontEnum);
+        return true;
+    }
+    
+    if (propertyName == exec->propertyNames().length && LIKELY(!d->overrodeLength)) {
+        descriptor.setDescriptor(jsNumber(d->numArguments), DontEnum);
+        return true;
+    }
+    
+    if (propertyName == exec->propertyNames().callee && LIKELY(!d->overrodeCallee)) {
+        if (!d->isStrictMode) {
+            descriptor.setDescriptor(d->callee, DontEnum);
+            return true;
+        }
+        createStrictModeCalleeIfNecessary(exec);
+    }
+
+    if (propertyName == exec->propertyNames().caller && d->isStrictMode)
+        createStrictModeCallerIfNecessary(exec);
+    
+    return JSObject::getOwnPropertyDescriptor(exec, propertyName, descriptor);
+}
+
+void Arguments::getOwnPropertyNames(ExecState* exec, PropertyNameArray& propertyNames, EnumerationMode mode)
+{
+    if (mode == IncludeDontEnumProperties) {
+        for (unsigned i = 0; i < d->numArguments; ++i) {
+            if (!d->deletedArguments || !d->deletedArguments[i])
+                propertyNames.add(Identifier(exec, UString::number(i)));
+        }
+        propertyNames.add(exec->propertyNames().callee);
+        propertyNames.add(exec->propertyNames().length);
+    }
+    JSObject::getOwnPropertyNames(exec, propertyNames, mode);
+}
+
+void Arguments::put(ExecState* exec, unsigned i, JSValue value, PutPropertySlot& slot)
+{
+    if (i < d->numArguments && (!d->deletedArguments || !d->deletedArguments[i])) {
+        if (i < d->numParameters)
+            d->registers[d->firstParameterIndex + i] = JSValue(value);
+        else
+            d->extraArguments[i - d->numParameters] = JSValue(value);
+        return;
+    }
+
+    JSObject::put(exec, Identifier(exec, UString::number(i)), value, slot);
+}
+
+void Arguments::put(ExecState* exec, const Identifier& propertyName, JSValue value, PutPropertySlot& slot)
+{
+    bool isArrayIndex;
+    unsigned i = propertyName.toArrayIndex(isArrayIndex);
+    if (isArrayIndex && i < d->numArguments && (!d->deletedArguments || !d->deletedArguments[i])) {
+        if (i < d->numParameters)
+            d->registers[d->firstParameterIndex + i] = JSValue(value);
+        else
+            d->extraArguments[i - d->numParameters] = JSValue(value);
+        return;
+    }
+
+    if (propertyName == exec->propertyNames().length && !d->overrodeLength) {
+        d->overrodeLength = true;
+        putDirect(propertyName, value, DontEnum);
+        return;
+    }
+
+    if (propertyName == exec->propertyNames().callee && !d->overrodeCallee) {
+        if (!d->isStrictMode) {
+            d->overrodeCallee = true;
+            putDirect(propertyName, value, DontEnum);
+            return;
+        }
+        createStrictModeCalleeIfNecessary(exec);
+    }
+
+    if (propertyName == exec->propertyNames().caller && d->isStrictMode)
+        createStrictModeCallerIfNecessary(exec);
+
+    JSObject::put(exec, propertyName, value, slot);
+}
+
+bool Arguments::deleteProperty(ExecState* exec, unsigned i) 
+{
+    if (i < d->numArguments) {
+        if (!d->deletedArguments) {
+            d->deletedArguments.set(new bool[d->numArguments]);
+            memset(d->deletedArguments.get(), 0, sizeof(bool) * d->numArguments);
+        }
+        if (!d->deletedArguments[i]) {
+            d->deletedArguments[i] = true;
+            return true;
+        }
+    }
+
+    return JSObject::deleteProperty(exec, Identifier(exec, UString::number(i)));
+}
+
+bool Arguments::deleteProperty(ExecState* exec, const Identifier& propertyName) 
+{
+    bool isArrayIndex;
+    unsigned i = propertyName.toArrayIndex(isArrayIndex);
+    if (isArrayIndex && i < d->numArguments) {
+        if (!d->deletedArguments) {
+            d->deletedArguments.set(new bool[d->numArguments]);
+            memset(d->deletedArguments.get(), 0, sizeof(bool) * d->numArguments);
+        }
+        if (!d->deletedArguments[i]) {
+            d->deletedArguments[i] = true;
+            return true;
+        }
+    }
+
+    if (propertyName == exec->propertyNames().length && !d->overrodeLength) {
+        d->overrodeLength = true;
+        return true;
+    }
+
+    if (propertyName == exec->propertyNames().callee && !d->overrodeCallee) {
+        if (!d->isStrictMode) {
+            d->overrodeCallee = true;
+            return true;
+        }
+        createStrictModeCalleeIfNecessary(exec);
+    }
+    
+    if (propertyName == exec->propertyNames().caller && !d->isStrictMode)
+        createStrictModeCallerIfNecessary(exec);
+
+    return JSObject::deleteProperty(exec, propertyName);
+}
+
+} // namespace JSC