Upstream version 8.37.186.0

[platform/framework/web/crosswalk.git] / src / v8 / src / elements-kind.cc

diff --git a/src/v8/src/elements-kind.cc b/src/v8/src/elements-kind.cc
index 6788e01..f5a9cc1 100644 (file)
--- a/src/v8/src/elements-kind.cc
+++ b/src/v8/src/elements-kind.cc
@@ -1,35 +1,13 @@
 // Copyright 2012 the V8 project authors. All rights reserved.
-// Redistribution and use in source and binary forms, with or without
-// modification, are permitted provided that the following conditions are
-// met:
-//
-//     * Redistributions of source code must retain the above copyright
-//       notice, this list of conditions and the following disclaimer.
-//     * 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.
-//     * Neither the name of Google Inc. 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 THE COPYRIGHT HOLDERS AND 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 THE COPYRIGHT
-// OWNER 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 "elements-kind.h"
-
-#include "api.h"
-#include "elements.h"
-#include "objects.h"
+// Use of this source code is governed by a BSD-style license that can be
+// found in the LICENSE file.
+
+#include "src/elements-kind.h"
+
+#include "src/api.h"
+#include "src/base/lazy-instance.h"
+#include "src/elements.h"
+#include "src/objects.h"
 
 namespace v8 {
 namespace internal {
@@ -62,8 +40,10 @@ int ElementsKindToShiftSize(ElementsKind elements_kind) {
     case FLOAT64_ELEMENTS:
       return 3;
     case EXTERNAL_FLOAT32x4_ELEMENTS:
+    case EXTERNAL_FLOAT64x2_ELEMENTS:
     case EXTERNAL_INT32x4_ELEMENTS:
     case FLOAT32x4_ELEMENTS:
+    case FLOAT64x2_ELEMENTS:
     case INT32x4_ELEMENTS:
       return 4;
     case FAST_SMI_ELEMENTS:
@@ -79,6 +59,13 @@ int ElementsKindToShiftSize(ElementsKind elements_kind) {
 }
 
 
+int GetDefaultHeaderSizeForElementsKind(ElementsKind elements_kind) {
+  STATIC_ASSERT(FixedArray::kHeaderSize == FixedDoubleArray::kHeaderSize);
+  return IsExternalArrayElementsKind(elements_kind)
+      ? 0 : (FixedArray::kHeaderSize - kHeapObjectTag);
+}
+
+
 const char* ElementsKindToString(ElementsKind kind) {
   ElementsAccessor* accessor = ElementsAccessor::ForKind(kind);
   return accessor->name();
@@ -124,8 +111,8 @@ struct InitializeFastElementsKindSequence {
 };
 
 
-static LazyInstance<ElementsKind*,
-                    InitializeFastElementsKindSequence>::type
+static base::LazyInstance<ElementsKind*,
+                          InitializeFastElementsKindSequence>::type
     fast_elements_kind_sequence = LAZY_INSTANCE_INITIALIZER;
 
 
@@ -177,28 +164,55 @@ ElementsKind GetNextMoreGeneralFastElementsKind(ElementsKind elements_kind,
 }
 
 
+static bool IsTypedArrayElementsKind(ElementsKind elements_kind) {
+  return IsFixedTypedArrayElementsKind(elements_kind) ||
+      IsExternalArrayElementsKind(elements_kind);
+}
+
+
+static inline bool IsFastTransitionTarget(ElementsKind elements_kind) {
+  return IsFastElementsKind(elements_kind) ||
+      elements_kind == DICTIONARY_ELEMENTS;
+}
+
 bool IsMoreGeneralElementsKindTransition(ElementsKind from_kind,
                                          ElementsKind to_kind) {
-  switch (from_kind) {
-    case FAST_SMI_ELEMENTS:
-      return to_kind != FAST_SMI_ELEMENTS;
-    case FAST_HOLEY_SMI_ELEMENTS:
-      return to_kind != FAST_SMI_ELEMENTS &&
-          to_kind != FAST_HOLEY_SMI_ELEMENTS;
-    case FAST_DOUBLE_ELEMENTS:
-      return to_kind != FAST_SMI_ELEMENTS &&
-          to_kind != FAST_HOLEY_SMI_ELEMENTS &&
-          to_kind != FAST_DOUBLE_ELEMENTS;
-    case FAST_HOLEY_DOUBLE_ELEMENTS:
-      return to_kind == FAST_ELEMENTS ||
-          to_kind == FAST_HOLEY_ELEMENTS;
-    case FAST_ELEMENTS:
-      return to_kind == FAST_HOLEY_ELEMENTS;
-    case FAST_HOLEY_ELEMENTS:
-      return false;
-    default:
-      return false;
+  if (IsTypedArrayElementsKind(from_kind) ||
+      IsTypedArrayElementsKind(to_kind)) {
+    switch (from_kind) {
+#define FIXED_TYPED_ARRAY_CASE(Type, type, TYPE, ctype, size) \
+      case TYPE##_ELEMENTS:                                   \
+        return to_kind == EXTERNAL_##TYPE##_ELEMENTS;
+
+      TYPED_ARRAYS(FIXED_TYPED_ARRAY_CASE);
+#undef FIXED_TYPED_ARRAY_CASE
+      default:
+        return false;
+    }
+  }
+  if (IsFastElementsKind(from_kind) && IsFastTransitionTarget(to_kind)) {
+    switch (from_kind) {
+      case FAST_SMI_ELEMENTS:
+        return to_kind != FAST_SMI_ELEMENTS;
+      case FAST_HOLEY_SMI_ELEMENTS:
+        return to_kind != FAST_SMI_ELEMENTS &&
+            to_kind != FAST_HOLEY_SMI_ELEMENTS;
+      case FAST_DOUBLE_ELEMENTS:
+        return to_kind != FAST_SMI_ELEMENTS &&
+            to_kind != FAST_HOLEY_SMI_ELEMENTS &&
+            to_kind != FAST_DOUBLE_ELEMENTS;
+      case FAST_HOLEY_DOUBLE_ELEMENTS:
+        return to_kind == FAST_ELEMENTS ||
+            to_kind == FAST_HOLEY_ELEMENTS;
+      case FAST_ELEMENTS:
+        return to_kind == FAST_HOLEY_ELEMENTS;
+      case FAST_HOLEY_ELEMENTS:
+        return false;
+      default:
+        return false;
+    }
   }
+  return false;
 }