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-rw-r--r--JavaScriptCore/runtime/Arguments.cpp232
1 files changed, 232 insertions, 0 deletions
diff --git a/JavaScriptCore/runtime/Arguments.cpp b/JavaScriptCore/runtime/Arguments.cpp
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+/*
+ * 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 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::mark()
+{
+ JSObject::mark();
+
+ if (d->registerArray) {
+ for (unsigned i = 0; i < d->numParameters; ++i) {
+ if (!d->registerArray[i].marked())
+ d->registerArray[i].mark();
+ }
+ }
+
+ if (d->extraArguments) {
+ unsigned numExtraArguments = d->numArguments - d->numParameters;
+ for (unsigned i = 0; i < numExtraArguments; ++i) {
+ if (!d->extraArguments[i].marked())
+ d->extraArguments[i].mark();
+ }
+ }
+
+ if (!d->callee->marked())
+ d->callee->mark();
+
+ if (d->activation && !d->activation->marked())
+ d->activation->mark();
+}
+
+void Arguments::fillArgList(ExecState* exec, ArgList& args)
+{
+ 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(exec));
+ for (; i < d->numArguments; ++i)
+ args.append(d->extraArguments[i - d->numParameters].jsValue(exec));
+ 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(exec));
+ else
+ args.append(get(exec, i));
+ }
+ for (; i < d->numArguments; ++i) {
+ if (!d->deletedArguments[i])
+ args.append(d->extraArguments[i - d->numParameters].jsValue(exec));
+ 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(exec));
+ return true;
+ }
+
+ return JSObject::getOwnPropertySlot(exec, Identifier(exec, UString::from(i)), slot);
+}
+
+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(exec));
+ return true;
+ }
+
+ if (propertyName == exec->propertyNames().length && LIKELY(!d->overrodeLength)) {
+ slot.setValue(jsNumber(exec, d->numArguments));
+ return true;
+ }
+
+ if (propertyName == exec->propertyNames().callee && LIKELY(!d->overrodeCallee)) {
+ slot.setValue(d->callee);
+ return true;
+ }
+
+ return JSObject::getOwnPropertySlot(exec, propertyName, slot);
+}
+
+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] = value;
+ else
+ d->extraArguments[i - d->numParameters] = value;
+ return;
+ }
+
+ JSObject::put(exec, Identifier(exec, UString::from(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] = value;
+ else
+ d->extraArguments[i - d->numParameters] = value;
+ return;
+ }
+
+ if (propertyName == exec->propertyNames().length && !d->overrodeLength) {
+ d->overrodeLength = true;
+ putDirect(propertyName, value, DontEnum);
+ return;
+ }
+
+ if (propertyName == exec->propertyNames().callee && !d->overrodeCallee) {
+ d->overrodeCallee = true;
+ putDirect(propertyName, value, DontEnum);
+ return;
+ }
+
+ 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::from(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) {
+ d->overrodeCallee = true;
+ return true;
+ }
+
+ return JSObject::deleteProperty(exec, propertyName);
+}
+
+} // namespace JSC
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