webkitgtk-2.4.11webkitgtk-2.4.11

1 files changed, 234 insertions, 0 deletions

diff --git a/Source/JavaScriptCore/runtime/JSActivation.cpp b/Source/JavaScriptCore/runtime/JSActivation.cpp
new file mode 100644
index 000000000..72ed1c712
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+++ b/Source/JavaScriptCore/runtime/JSActivation.cpp
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+/*
+ * Copyright (C) 2008, 2009 Apple Inc. All rights reserved.
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions
+ * are met:
+ *
+ * 1.  Redistributions of source code must retain the above copyright
+ *     notice, this list of conditions and the following disclaimer.
+ * 2.  Redistributions in binary form must reproduce the above copyright
+ *     notice, this list of conditions and the following disclaimer in the
+ *     documentation and/or other materials provided with the distribution.
+ * 3.  Neither the name of Apple Computer, Inc. ("Apple") nor the names of
+ *     its contributors may be used to endorse or promote products derived
+ *     from this software without specific prior written permission.
+ *
+ * THIS SOFTWARE IS PROVIDED BY APPLE AND ITS CONTRIBUTORS "AS IS" AND ANY
+ * EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED
+ * WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
+ * DISCLAIMED. IN NO EVENT SHALL APPLE OR ITS CONTRIBUTORS BE LIABLE FOR ANY
+ * DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES
+ * (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
+ * LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND
+ * ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
+ * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
+ * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
+ */
+ 
+#include "config.h"
+#include "JSActivation.h"
+
+#include "Arguments.h"
+#include "Interpreter.h"
+#include "JSFunction.h"
+#include "Operations.h"
+
+using namespace std;
+
+namespace JSC {
+
+const ClassInfo JSActivation::s_info = { "JSActivation", &Base::s_info, 0, 0, CREATE_METHOD_TABLE(JSActivation) };
+
+void JSActivation::visitChildren(JSCell* cell, SlotVisitor& visitor)
+{
+    JSActivation* thisObject = jsCast<JSActivation*>(cell);
+    ASSERT_GC_OBJECT_INHERITS(thisObject, info());
+    COMPILE_ASSERT(StructureFlags & OverridesVisitChildren, OverridesVisitChildrenWithoutSettingFlag);
+    ASSERT(thisObject->structure()->typeInfo().overridesVisitChildren());
+    Base::visitChildren(thisObject, visitor);
+
+    // No need to mark our registers if they're still in the JSStack.
+    if (!thisObject->isTornOff())
+        return;
+
+    for (int i = 0; i < thisObject->symbolTable()->captureCount(); ++i)
+        visitor.append(&thisObject->storage()[i]);
+}
+
+inline bool JSActivation::symbolTableGet(PropertyName propertyName, PropertySlot& slot)
+{
+    SymbolTableEntry entry = symbolTable()->inlineGet(propertyName.publicName());
+    if (entry.isNull())
+        return false;
+
+    // Defend against the inspector asking for a var after it has been optimized out.
+    if (isTornOff() && !isValid(entry))
+        return false;
+
+    slot.setValue(this, DontEnum, registerAt(entry.getIndex()).get());
+    return true;
+}
+
+inline bool JSActivation::symbolTableGet(PropertyName propertyName, PropertyDescriptor& descriptor)
+{
+    SymbolTableEntry entry = symbolTable()->inlineGet(propertyName.publicName());
+    if (entry.isNull())
+        return false;
+
+    // Defend against the inspector asking for a var after it has been optimized out.
+    if (isTornOff() && !isValid(entry))
+        return false;
+
+    descriptor.setDescriptor(registerAt(entry.getIndex()).get(), entry.getAttributes());
+    return true;
+}
+
+inline bool JSActivation::symbolTablePut(ExecState* exec, PropertyName propertyName, JSValue value, bool shouldThrow)
+{
+    VM& vm = exec->vm();
+    ASSERT(!Heap::heap(value) || Heap::heap(value) == Heap::heap(this));
+    
+    SymbolTableEntry entry = symbolTable()->inlineGet(propertyName.publicName());
+    if (entry.isNull())
+        return false;
+    if (entry.isReadOnly()) {
+        if (shouldThrow)
+            throwTypeError(exec, StrictModeReadonlyPropertyWriteError);
+        return true;
+    }
+
+    // Defend against the inspector asking for a var after it has been optimized out.
+    if (isTornOff() && !isValid(entry))
+        return false;
+
+    registerAt(entry.getIndex()).set(vm, this, value);
+    return true;
+}
+
+void JSActivation::getOwnNonIndexPropertyNames(JSObject* object, ExecState* exec, PropertyNameArray& propertyNames, EnumerationMode mode)
+{
+    JSActivation* thisObject = jsCast<JSActivation*>(object);
+
+    CallFrame* callFrame = CallFrame::create(reinterpret_cast<Register*>(thisObject->m_registers));
+    if (mode == IncludeDontEnumProperties && !thisObject->isTornOff() && (callFrame->codeBlock()->usesArguments() || callFrame->codeBlock()->usesEval()))
+        propertyNames.add(exec->propertyNames().arguments);
+
+    {
+        ConcurrentJITLocker locker(thisObject->symbolTable()->m_lock);
+        SymbolTable::Map::iterator end = thisObject->symbolTable()->end(locker);
+        for (SymbolTable::Map::iterator it = thisObject->symbolTable()->begin(locker); it != end; ++it) {
+            if (it->value.getAttributes() & DontEnum && mode != IncludeDontEnumProperties)
+                continue;
+            if (!thisObject->isValid(it->value))
+                continue;
+            propertyNames.add(Identifier(exec, it->key.get()));
+        }
+    }
+    // Skip the JSVariableObject implementation of getOwnNonIndexPropertyNames
+    JSObject::getOwnNonIndexPropertyNames(thisObject, exec, propertyNames, mode);
+}
+
+inline bool JSActivation::symbolTablePutWithAttributes(VM& vm, PropertyName propertyName, JSValue value, unsigned attributes)
+{
+    ASSERT(!Heap::heap(value) || Heap::heap(value) == Heap::heap(this));
+    
+    WriteBarrierBase<Unknown>* reg;
+    {
+        ConcurrentJITLocker locker(symbolTable()->m_lock);
+        SymbolTable::Map::iterator iter = symbolTable()->find(locker, propertyName.publicName());
+        if (iter == symbolTable()->end(locker))
+            return false;
+        SymbolTableEntry& entry = iter->value;
+        ASSERT(!entry.isNull());
+        if (!isValid(entry))
+            return false;
+        
+        entry.setAttributes(attributes);
+        reg = &registerAt(entry.getIndex());
+    }
+    reg->set(vm, this, value);
+    return true;
+}
+
+bool JSActivation::getOwnPropertySlot(JSObject* object, ExecState* exec, PropertyName propertyName, PropertySlot& slot)
+{
+    JSActivation* thisObject = jsCast<JSActivation*>(object);
+
+    if (propertyName == exec->propertyNames().arguments) {
+        // Defend against the inspector asking for the arguments object after it has been optimized out.
+        CallFrame* callFrame = CallFrame::create(reinterpret_cast<Register*>(thisObject->m_registers));
+        if (!thisObject->isTornOff() && (callFrame->codeBlock()->usesArguments() || callFrame->codeBlock()->usesEval())) {
+            slot.setCustom(thisObject, DontEnum, argumentsGetter);
+            return true;
+        }
+    }
+
+    if (thisObject->symbolTableGet(propertyName, slot))
+        return true;
+
+    unsigned attributes;
+    if (JSValue value = thisObject->getDirect(exec->vm(), propertyName, attributes)) {
+        slot.setValue(thisObject, attributes, value);
+        return true;
+    }
+
+    // We don't call through to JSObject because there's no way to give an 
+    // activation object getter properties or a prototype.
+    ASSERT(!thisObject->hasGetterSetterProperties());
+    ASSERT(thisObject->prototype().isNull());
+    return false;
+}
+
+void JSActivation::put(JSCell* cell, ExecState* exec, PropertyName propertyName, JSValue value, PutPropertySlot& slot)
+{
+    JSActivation* thisObject = jsCast<JSActivation*>(cell);
+    ASSERT(!Heap::heap(value) || Heap::heap(value) == Heap::heap(thisObject));
+
+    if (thisObject->symbolTablePut(exec, propertyName, value, slot.isStrictMode()))
+        return;
+
+    // We don't call through to JSObject because __proto__ and getter/setter 
+    // properties are non-standard extensions that other implementations do not
+    // expose in the activation object.
+    ASSERT(!thisObject->hasGetterSetterProperties());
+    thisObject->putOwnDataProperty(exec->vm(), propertyName, value, slot);
+}
+
+bool JSActivation::deleteProperty(JSCell* cell, ExecState* exec, PropertyName propertyName)
+{
+    if (propertyName == exec->propertyNames().arguments)
+        return false;
+
+    return Base::deleteProperty(cell, exec, propertyName);
+}
+
+JSValue JSActivation::toThis(JSCell*, ExecState* exec, ECMAMode ecmaMode)
+{
+    if (ecmaMode == StrictMode)
+        return jsUndefined();
+    return exec->globalThisValue();
+}
+
+EncodedJSValue JSActivation::argumentsGetter(ExecState*, EncodedJSValue slotBase, EncodedJSValue, PropertyName)
+{
+    JSActivation* activation = jsCast<JSActivation*>(JSValue::decode(slotBase));
+    CallFrame* callFrame = CallFrame::create(reinterpret_cast<Register*>(activation->m_registers));
+    ASSERT(!activation->isTornOff() && (callFrame->codeBlock()->usesArguments() || callFrame->codeBlock()->usesEval()));
+    if (activation->isTornOff() || !(callFrame->codeBlock()->usesArguments() || callFrame->codeBlock()->usesEval()))
+        return JSValue::encode(jsUndefined());
+
+    VirtualRegister argumentsRegister = callFrame->codeBlock()->argumentsRegister();
+    if (JSValue arguments = callFrame->uncheckedR(argumentsRegister.offset()).jsValue())
+        return JSValue::encode(arguments);
+    int realArgumentsRegister = unmodifiedArgumentsRegister(argumentsRegister).offset();
+
+    JSValue arguments = JSValue(Arguments::create(callFrame->vm(), callFrame));
+    callFrame->uncheckedR(argumentsRegister.offset()) = arguments;
+    callFrame->uncheckedR(realArgumentsRegister) = arguments;
+    
+    ASSERT(callFrame->uncheckedR(realArgumentsRegister).jsValue().inherits(Arguments::info()));
+    return JSValue::encode(callFrame->uncheckedR(realArgumentsRegister).jsValue());
+}
+
+} // namespace JSC