[objects.h splitting] Move out ConstantElementsPair and BoileplateDescriptor.

src/objects/literal-objects.h

+// Copyright 2017 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_OBJECTS_LITERAL_OBJECTS_H_
+#define V8_OBJECTS_LITERAL_OBJECTS_H_
+
+#include "src/objects.h"
+
+// Has to be the last include (doesn't have include guards):
+#include "src/objects/object-macros.h"
+
+namespace v8 {
+namespace internal {
+
+// BoilerplateDescription is a list of properties consisting of name value
+// pairs. In addition to the properties, it provides the projected number
+// of properties in the backing store. This number includes properties with
+// computed names that are not
+// in the list.
+class BoilerplateDescription : public FixedArray {
+ public:
+  Object* name(int index) const;
+  Object* value(int index) const;
+
+  // The number of boilerplate properties.
+  int size() const;
+
+  // Number of boilerplate properties and properties with computed names.
+  int backing_store_size() const;
+
+  void set_backing_store_size(Isolate* isolate, int backing_store_size);
+
+  DECLARE_CAST(BoilerplateDescription)
+
+ private:
+  bool has_number_of_properties() const;
+};
+
+// Pair of {ElementsKind} and an array of constant values for {ArrayLiteral}
+// expressions. Used to communicate with the runtime for literal boilerplate
+// creation within the {Runtime_CreateArrayLiteral} method.
+class ConstantElementsPair : public Struct {
+ public:
+  DECL_INT_ACCESSORS(elements_kind)
+  DECL_ACCESSORS(constant_values, FixedArrayBase)
+
+  DECLARE_CAST(ConstantElementsPair)
+
+  // Dispatched behavior.
+  DECLARE_PRINTER(ConstantElementsPair)
+  DECLARE_VERIFIER(ConstantElementsPair)
+
+  static const int kElementsKindOffset = HeapObject::kHeaderSize;
+  static const int kConstantValuesOffset = kElementsKindOffset + kPointerSize;
+  static const int kSize = kConstantValuesOffset + kPointerSize;
+
+ private:
+  DISALLOW_IMPLICIT_CONSTRUCTORS(ConstantElementsPair);
+};
+
+}  // namespace internal
+}  // namespace v8
+
+#include "src/objects/object-macros-undef.h"
+
+#endif  // V8_OBJECTS_LITERAL_OBJECTS_H_