Imported WebKit commit 2ea9d364d0f6efa8fa64acf19f451504c59be0e4 (http://svn.webkit.org/repository/webkit/trunk@104285)

1 files changed, 119 insertions, 0 deletions

diff --git a/Source/JavaScriptCore/bytecode/StructureStubInfo.cpp b/Source/JavaScriptCore/bytecode/StructureStubInfo.cpp
new file mode 100644
index 000000000..ec18782d5
--- /dev/null
+++ b/Source/JavaScriptCore/bytecode/StructureStubInfo.cpp
@@ -0,0 +1,119 @@
+/*
+ * Copyright (C) 2008 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.
+ *
+ * THIS SOFTWARE IS PROVIDED BY APPLE INC. ``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 INC. OR
+ * 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 "StructureStubInfo.h"
+
+#include "JSObject.h"
+#include "ScopeChain.h"
+
+namespace JSC {
+
+#if ENABLE(JIT)
+void StructureStubInfo::deref()
+{
+    switch (accessType) {
+    case access_get_by_id_self_list: {
+        PolymorphicAccessStructureList* polymorphicStructures = u.getByIdSelfList.structureList;
+        delete polymorphicStructures;
+        return;
+    }
+    case access_get_by_id_proto_list: {
+        PolymorphicAccessStructureList* polymorphicStructures = u.getByIdProtoList.structureList;
+        delete polymorphicStructures;
+        return;
+    }
+    case access_get_by_id_self:
+    case access_get_by_id_proto:
+    case access_get_by_id_chain:
+    case access_put_by_id_transition_normal:
+    case access_put_by_id_transition_direct:
+    case access_put_by_id_replace:
+    case access_unset:
+    case access_get_by_id_generic:
+    case access_put_by_id_generic:
+    case access_get_array_length:
+    case access_get_string_length:
+        // These instructions don't have to release any allocated memory
+        return;
+    default:
+        ASSERT_NOT_REACHED();
+    }
+}
+
+bool StructureStubInfo::visitWeakReferences()
+{
+    switch (accessType) {
+    case access_get_by_id_self:
+        if (!Heap::isMarked(u.getByIdSelf.baseObjectStructure.get()))
+            return false;
+        break;
+    case access_get_by_id_proto:
+        if (!Heap::isMarked(u.getByIdProto.baseObjectStructure.get())
+            || !Heap::isMarked(u.getByIdProto.prototypeStructure.get()))
+            return false;
+        break;
+    case access_get_by_id_chain:
+        if (!Heap::isMarked(u.getByIdChain.baseObjectStructure.get())
+            || !Heap::isMarked(u.getByIdChain.chain.get()))
+            return false;
+        break;
+    case access_get_by_id_self_list: {
+        PolymorphicAccessStructureList* polymorphicStructures = u.getByIdSelfList.structureList;
+        if (!polymorphicStructures->visitWeak(u.getByIdSelfList.listSize)) {
+            delete polymorphicStructures;
+            return false;
+        }
+        break;
+    }
+    case access_get_by_id_proto_list: {
+        PolymorphicAccessStructureList* polymorphicStructures = u.getByIdProtoList.structureList;
+        if (!polymorphicStructures->visitWeak(u.getByIdSelfList.listSize)) {
+            delete polymorphicStructures;
+            return false;
+        }
+        break;
+    }
+    case access_put_by_id_transition_normal:
+    case access_put_by_id_transition_direct:
+        if (!Heap::isMarked(u.putByIdTransition.previousStructure.get())
+            || !Heap::isMarked(u.putByIdTransition.structure.get())
+            || !Heap::isMarked(u.putByIdTransition.chain.get()))
+            return false;
+        break;
+    case access_put_by_id_replace:
+        if (!Heap::isMarked(u.putByIdReplace.baseObjectStructure.get()))
+            return false;
+        break;
+    default:
+        // The rest of the instructions don't require references, so there is no need to
+        // do anything.
+        break;
+    }
+    return true;
+}
+#endif
+
+} // namespace JSC