webkitgtk-2.16.5HEADwebkitgtk-2.16.5master

1 files changed, 101 insertions, 0 deletions

diff --git a/Source/JavaScriptCore/runtime/JSArrayInlines.h b/Source/JavaScriptCore/runtime/JSArrayInlines.h
new file mode 100644
index 000000000..30d7e4f79
--- /dev/null
+++ b/Source/JavaScriptCore/runtime/JSArrayInlines.h
@@ -0,0 +1,101 @@
+/*
+ *  Copyright (C) 2016 Apple Inc. All rights reserved.
+ *
+ *  This library is free software; you can redistribute it and/or
+ *  modify it under the terms of the GNU Lesser 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
+ *  Lesser General Public License for more details.
+ *
+ *  You should have received a copy of the GNU Lesser General Public
+ *  License along with this library; if not, write to the Free Software
+ *  Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA  02110-1301  USA
+ *
+ */
+
+#pragma once
+
+#include "JSArray.h"
+#include "JSCellInlines.h"
+#include "Structure.h"
+
+namespace JSC {
+
+inline IndexingType JSArray::mergeIndexingTypeForCopying(IndexingType other)
+{
+    IndexingType type = indexingType();
+    if (!(type & IsArray && other & IsArray))
+        return NonArray;
+
+    if (hasAnyArrayStorage(type) || hasAnyArrayStorage(other))
+        return NonArray;
+
+    if (type == ArrayWithUndecided)
+        return other;
+
+    if (other == ArrayWithUndecided)
+        return type;
+
+    // We can memcpy an Int32 and a Contiguous into a Contiguous array since
+    // both share the same memory layout for Int32 numbers.
+    if ((type == ArrayWithInt32 || type == ArrayWithContiguous)
+        && (other == ArrayWithInt32 || other == ArrayWithContiguous)) {
+        if (other == ArrayWithContiguous)
+            return other;
+        return type;
+    }
+
+    if (type != other)
+        return NonArray;
+
+    return type;
+}
+
+inline bool JSArray::canFastCopy(VM& vm, JSArray* otherArray)
+{
+    if (hasAnyArrayStorage(indexingType()) || hasAnyArrayStorage(otherArray->indexingType()))
+        return false;
+    // FIXME: We should have a watchpoint for indexed properties on Array.prototype and Object.prototype
+    // instead of walking the prototype chain. https://bugs.webkit.org/show_bug.cgi?id=155592
+    if (structure(vm)->holesMustForwardToPrototype(vm)
+        || otherArray->structure(vm)->holesMustForwardToPrototype(vm))
+        return false;
+    return true;
+}
+
+ALWAYS_INLINE unsigned getLength(ExecState* exec, JSObject* obj)
+{
+    VM& vm = exec->vm();
+    auto scope = DECLARE_THROW_SCOPE(vm);
+    if (isJSArray(obj))
+        return jsCast<JSArray*>(obj)->length();
+
+    JSValue lengthValue = obj->get(exec, vm.propertyNames->length);
+    RETURN_IF_EXCEPTION(scope, UINT_MAX);
+    scope.release();
+    return lengthValue.toUInt32(exec);
+}
+
+ALWAYS_INLINE double toLength(ExecState* exec, JSObject* obj)
+{
+    VM& vm = exec->vm();
+    auto scope = DECLARE_THROW_SCOPE(vm);
+    if (isJSArray(obj))
+        return jsCast<JSArray*>(obj)->length();
+
+    JSValue lengthValue = obj->get(exec, vm.propertyNames->length);
+    RETURN_IF_EXCEPTION(scope, PNaN);
+    scope.release();
+    return lengthValue.toLength(exec);
+}
+
+ALWAYS_INLINE bool JSArray::isIteratorProtocolFastAndNonObservable()
+{
+    return globalObject()->isArrayIteratorProtocolFastAndNonObservable();
+}
+
+} // namespace JSC