Introduce {ConstantElementsPair} struct for type safety.

src/objects.h

 // Copyright 2015 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_H_
 #define V8_OBJECTS_H_
 
 #include <iosfwd>
 #include <memory>
 
@@ skipping 373 matching lines @@
   V(SCRIPT_TYPE)                                                \
   V(TYPE_FEEDBACK_INFO_TYPE)                                    \
   V(ALIASED_ARGUMENTS_ENTRY_TYPE)                               \
   V(BOX_TYPE)                                                   \
   V(PROMISE_RESOLVE_THENABLE_JOB_INFO_TYPE)                     \
   V(PROMISE_REACTION_JOB_INFO_TYPE)                             \
   V(PROTOTYPE_INFO_TYPE)                                        \
   V(TUPLE2_TYPE)                                                \
   V(TUPLE3_TYPE)                                                \
   V(CONTEXT_EXTENSION_TYPE)                                     \
+  V(CONSTANT_ELEMENTS_PAIR_TYPE)                                \
   V(MODULE_TYPE)                                                \
   V(MODULE_INFO_ENTRY_TYPE)                                     \
                                                                 \
   V(FIXED_ARRAY_TYPE)                                           \
   V(FIXED_DOUBLE_ARRAY_TYPE)                                    \
   V(SHARED_FUNCTION_INFO_TYPE)                                  \
   V(WEAK_CELL_TYPE)                                             \
   V(TRANSITION_ARRAY_TYPE)                                      \
                                                                 \
   V(JS_MESSAGE_OBJECT_TYPE)                                     \
@@ skipping 148 matching lines @@
   V(ALLOCATION_MEMENTO, AllocationMemento, allocation_memento)               \
   V(TYPE_FEEDBACK_INFO, TypeFeedbackInfo, type_feedback_info)                \
   V(ALIASED_ARGUMENTS_ENTRY, AliasedArgumentsEntry, aliased_arguments_entry) \
   V(DEBUG_INFO, DebugInfo, debug_info)                                       \
   V(BREAK_POINT_INFO, BreakPointInfo, break_point_info)                      \
   V(PROTOTYPE_INFO, PrototypeInfo, prototype_info)                           \
   V(TUPLE2, Tuple2, tuple2)                                                  \
   V(TUPLE3, Tuple3, tuple3)                                                  \
   V(MODULE, Module, module)                                                  \
   V(MODULE_INFO_ENTRY, ModuleInfoEntry, module_info_entry)                   \
-  V(CONTEXT_EXTENSION, ContextExtension, context_extension)
+  V(CONTEXT_EXTENSION, ContextExtension, context_extension)                  \
+  V(CONSTANT_ELEMENTS_PAIR, ConstantElementsPair, constant_elements_pair)
 
 // We use the full 8 bits of the instance_type field to encode heap object
 // instance types.  The high-order bit (bit 7) is set if the object is not a
 // string, and cleared if it is a string.
 const uint32_t kIsNotStringMask = 0x80;
 const uint32_t kStringTag = 0x0;
 const uint32_t kNotStringTag = 0x80;
 
 // Bit 6 indicates that the object is an internalized string (if set) or not.
 // Bit 7 has to be clear as well.
@@ skipping 158 matching lines @@
   FIXED_ARRAY_TYPE,
   SHARED_FUNCTION_INFO_TYPE,
   CELL_TYPE,
   WEAK_CELL_TYPE,
   TRANSITION_ARRAY_TYPE,
   PROPERTY_CELL_TYPE,
   PROTOTYPE_INFO_TYPE,
   TUPLE2_TYPE,
   TUPLE3_TYPE,
   CONTEXT_EXTENSION_TYPE,
+  CONSTANT_ELEMENTS_PAIR_TYPE,
   MODULE_TYPE,
   MODULE_INFO_ENTRY_TYPE,
 
   // All the following types are subtypes of JSReceiver, which corresponds to
   // objects in the JS sense. The first and the last type in this range are
   // the two forms of function. This organization enables using the same
   // compares for checking the JS_RECEIVER and the NONCALLABLE_JS_OBJECT range.
   JS_PROXY_TYPE,          // FIRST_JS_RECEIVER_TYPE
   JS_GLOBAL_OBJECT_TYPE,  // FIRST_JS_OBJECT_TYPE
   JS_GLOBAL_PROXY_TYPE,
@@ skipping 6301 matching lines @@
   DECLARE_VERIFIER(ContextExtension)
 
   static const int kScopeInfoOffset = HeapObject::kHeaderSize;
   static const int kExtensionOffset = kScopeInfoOffset + kPointerSize;
   static const int kSize = kExtensionOffset + kPointerSize;
 
  private:
   DISALLOW_IMPLICIT_CONSTRUCTORS(ContextExtension);
 };
 
+// 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);
+};
 
 // Script describes a script which has been added to the VM.
 class Script: public Struct {
  public:
   // Script types.
   enum Type {
     TYPE_NATIVE = 0,
     TYPE_EXTENSION = 1,
     TYPE_NORMAL = 2,
     TYPE_WASM = 3,
@@ skipping 4918 matching lines @@
     }
     return value;
   }
 };
 
 
 }  // NOLINT, false-positive due to second-order macros.
 }  // NOLINT, false-positive due to second-order macros.
 
 #endif  // V8_OBJECTS_H_