deps: update v8 to 3.28.73

Reviewed-By: Fedor Indutny <fedor@indutny.com>
PR-URL: https://github.com/joyent/node/pull/8476

1 files changed, 112 insertions, 0 deletions

diff --git a/deps/v8/src/field-index.h b/deps/v8/src/field-index.h
new file mode 100644
index 0000000000..8650c8fb8f
--- /dev/null
+++ b/deps/v8/src/field-index.h
@@ -0,0 +1,112 @@
+// Copyright 2014 the V8 project authors. All rights reserved.
+// Use of this source code is governed by a BSD-style license that can be
+// found in the LICENSE file.
+
+#ifndef V8_FIELD_INDEX_H_
+#define V8_FIELD_INDEX_H_
+
+#include "src/property-details.h"
+#include "src/utils.h"
+
+namespace v8 {
+namespace internal {
+
+class Map;
+
+// Wrapper class to hold a field index, usually but not necessarily generated
+// from a property index. When available, the wrapper class captures additional
+// information to allow the field index to be translated back into the property
+// index it was originally generated from.
+class FieldIndex V8_FINAL {
+ public:
+  static FieldIndex ForPropertyIndex(Map* map,
+                                     int index,
+                                     bool is_double = false);
+  static FieldIndex ForInObjectOffset(int offset, Map* map = NULL);
+  static FieldIndex ForLookupResult(const LookupResult* result);
+  static FieldIndex ForDescriptor(Map* map, int descriptor_index);
+  static FieldIndex ForLoadByFieldIndex(Map* map, int index);
+  static FieldIndex ForKeyedLookupCacheIndex(Map* map, int index);
+
+  int GetLoadByFieldIndex() const;
+
+  bool is_inobject() const {
+    return IsInObjectBits::decode(bit_field_);
+  }
+
+  bool is_double() const {
+    return IsDoubleBits::decode(bit_field_);
+  }
+
+  int offset() const {
+    return index() * kPointerSize;
+  }
+
+  // Zero-indexed from beginning of the object.
+  int index() const {
+    return IndexBits::decode(bit_field_);
+  }
+
+  int outobject_array_index() const {
+    DCHECK(!is_inobject());
+    return index() - first_inobject_property_offset() / kPointerSize;
+  }
+
+  // Zero-based from the first inobject property. Overflows to out-of-object
+  // properties.
+  int property_index() const {
+    DCHECK(!IsHiddenField::decode(bit_field_));
+    int result = index() - first_inobject_property_offset() / kPointerSize;
+    if (!is_inobject()) {
+      result += InObjectPropertyBits::decode(bit_field_);
+    }
+    return result;
+  }
+
+  int GetKeyedLookupCacheIndex() const;
+
+  int GetFieldAccessStubKey() const {
+    return bit_field_ &
+        (IsInObjectBits::kMask | IsDoubleBits::kMask | IndexBits::kMask);
+  }
+
+ private:
+  FieldIndex(bool is_inobject, int local_index, bool is_double,
+             int inobject_properties, int first_inobject_property_offset,
+             bool is_hidden = false) {
+    DCHECK((first_inobject_property_offset & (kPointerSize - 1)) == 0);
+    bit_field_ = IsInObjectBits::encode(is_inobject) |
+      IsDoubleBits::encode(is_double) |
+      FirstInobjectPropertyOffsetBits::encode(first_inobject_property_offset) |
+      IsHiddenField::encode(is_hidden) |
+      IndexBits::encode(local_index) |
+      InObjectPropertyBits::encode(inobject_properties);
+  }
+
+  int first_inobject_property_offset() const {
+    DCHECK(!IsHiddenField::decode(bit_field_));
+    return FirstInobjectPropertyOffsetBits::decode(bit_field_);
+  }
+
+  static const int kIndexBitsSize = kDescriptorIndexBitCount + 1;
+
+  // Index from beginning of object.
+  class IndexBits: public BitField<int, 0, kIndexBitsSize> {};
+  class IsInObjectBits: public BitField<bool, IndexBits::kNext, 1> {};
+  class IsDoubleBits: public BitField<bool, IsInObjectBits::kNext, 1> {};
+  // Number of inobject properties.
+  class InObjectPropertyBits
+      : public BitField<int, IsDoubleBits::kNext, kDescriptorIndexBitCount> {};
+  // Offset of first inobject property from beginning of object.
+  class FirstInobjectPropertyOffsetBits
+      : public BitField<int, InObjectPropertyBits::kNext, 7> {};
+  class IsHiddenField
+      : public BitField<bool, FirstInobjectPropertyOffsetBits::kNext, 1> {};
+  STATIC_ASSERT(IsHiddenField::kNext <= 32);
+
+  int bit_field_;
+};
+
+} }  // namespace v8::internal
+
+#endif