webkitgtk-2.10.2webkitgtk-2.10.2

1 files changed, 185 insertions, 0 deletions

diff --git a/Source/JavaScriptCore/runtime/JSLexicalEnvironment.cpp b/Source/JavaScriptCore/runtime/JSLexicalEnvironment.cpp
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+++ b/Source/JavaScriptCore/runtime/JSLexicalEnvironment.cpp
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+/*
+ * Copyright (C) 2008, 2009, 2014, 2015 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 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 "JSLexicalEnvironment.h"
+
+#include "Interpreter.h"
+#include "JSFunction.h"
+#include "JSCInlines.h"
+
+using namespace std;
+
+namespace JSC {
+
+const ClassInfo JSLexicalEnvironment::s_info = { "JSLexicalEnvironment", &Base::s_info, 0, CREATE_METHOD_TABLE(JSLexicalEnvironment) };
+
+inline bool JSLexicalEnvironment::symbolTableGet(PropertyName propertyName, PropertySlot& slot)
+{
+    SymbolTableEntry entry = symbolTable()->inlineGet(propertyName.uid());
+    if (entry.isNull())
+        return false;
+
+    ScopeOffset offset = entry.scopeOffset();
+
+    // Defend against the inspector asking for a var after it has been optimized out.
+    if (!isValid(offset))
+        return false;
+
+    JSValue result = variableAt(offset).get();
+    slot.setValue(this, DontEnum, result);
+    return true;
+}
+
+inline bool JSLexicalEnvironment::symbolTablePut(ExecState* exec, PropertyName propertyName, JSValue value, bool shouldThrow)
+{
+    VM& vm = exec->vm();
+    ASSERT(!Heap::heap(value) || Heap::heap(value) == Heap::heap(this));
+    
+    WriteBarrierBase<Unknown>* reg;
+    WatchpointSet* set;
+    {
+        GCSafeConcurrentJITLocker locker(symbolTable()->m_lock, exec->vm().heap);
+        SymbolTable::Map::iterator iter = symbolTable()->find(locker, propertyName.uid());
+        if (iter == symbolTable()->end(locker))
+            return false;
+        ASSERT(!iter->value.isNull());
+        if (iter->value.isReadOnly()) {
+            if (shouldThrow || isLexicalScope())
+                throwTypeError(exec, StrictModeReadonlyPropertyWriteError);
+            return true;
+        }
+        ScopeOffset offset = iter->value.scopeOffset();
+        // Defend against the inspector asking for a var after it has been optimized out.
+        if (!isValid(offset))
+            return false;
+        set = iter->value.watchpointSet();
+        reg = &variableAt(offset);
+    }
+    reg->set(vm, this, value);
+    if (set)
+        set->invalidate(VariableWriteFireDetail(this, propertyName)); // Don't mess around - if we had found this statically, we would have invalidated it.
+    return true;
+}
+
+void JSLexicalEnvironment::getOwnNonIndexPropertyNames(JSObject* object, ExecState* exec, PropertyNameArray& propertyNames, EnumerationMode mode)
+{
+    JSLexicalEnvironment* thisObject = jsCast<JSLexicalEnvironment*>(object);
+
+    {
+        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.scopeOffset()))
+                continue;
+            if (it->key->isSymbol() && !propertyNames.includeSymbolProperties())
+                continue;
+            propertyNames.add(Identifier::fromUid(exec, it->key.get()));
+        }
+    }
+    // Skip the JSEnvironmentRecord implementation of getOwnNonIndexPropertyNames
+    JSObject::getOwnNonIndexPropertyNames(thisObject, exec, propertyNames, mode);
+}
+
+inline bool JSLexicalEnvironment::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.uid());
+        if (iter == symbolTable()->end(locker))
+            return false;
+        SymbolTableEntry& entry = iter->value;
+        ASSERT(!entry.isNull());
+        
+        ScopeOffset offset = entry.scopeOffset();
+        if (!isValid(offset))
+            return false;
+        
+        entry.setAttributes(attributes);
+        reg = &variableAt(offset);
+    }
+    reg->set(vm, this, value);
+    return true;
+}
+
+bool JSLexicalEnvironment::getOwnPropertySlot(JSObject* object, ExecState* exec, PropertyName propertyName, PropertySlot& slot)
+{
+    JSLexicalEnvironment* thisObject = jsCast<JSLexicalEnvironment*>(object);
+
+    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 a 
+    // lexical environment object getter properties or a prototype.
+    ASSERT(!thisObject->hasGetterSetterProperties());
+    ASSERT(thisObject->prototype().isNull());
+    return false;
+}
+
+void JSLexicalEnvironment::put(JSCell* cell, ExecState* exec, PropertyName propertyName, JSValue value, PutPropertySlot& slot)
+{
+    JSLexicalEnvironment* thisObject = jsCast<JSLexicalEnvironment*>(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 lexicalEnvironment object.
+    ASSERT(!thisObject->hasGetterSetterProperties());
+    thisObject->putOwnDataProperty(exec->vm(), propertyName, value, slot);
+}
+
+bool JSLexicalEnvironment::deleteProperty(JSCell* cell, ExecState* exec, PropertyName propertyName)
+{
+    if (propertyName == exec->propertyNames().arguments)
+        return false;
+
+    return Base::deleteProperty(cell, exec, propertyName);
+}
+
+JSValue JSLexicalEnvironment::toThis(JSCell*, ExecState* exec, ECMAMode ecmaMode)
+{
+    if (ecmaMode == StrictMode)
+        return jsUndefined();
+    return exec->globalThisValue();
+}
+
+} // namespace JSC