[inspector] store stack frame in struct instead of JSObject

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 126 matching lines @@
 //       - AccessorPair
 //       - AccessCheckInfo
 //       - InterceptorInfo
 //       - CallHandlerInfo
 //       - TemplateInfo
 //         - FunctionTemplateInfo
 //         - ObjectTemplateInfo
 //       - Script
 //       - DebugInfo
 //       - BreakPointInfo
+//       - StackFrameInfo
 //       - CodeCache
 //       - PrototypeInfo
 //       - Module
 //       - ModuleInfoEntry
 //     - WeakCell
 //
 // Formats of Object*:
 //  Smi:        [31 bit signed int] 0
 //  HeapObject: [32 bit direct pointer] (4 byte aligned) | 01
 
@@ skipping 193 matching lines @@
   V(OBJECT_TEMPLATE_INFO_TYPE)                                  \
   V(ALLOCATION_SITE_TYPE)                                       \
   V(ALLOCATION_MEMENTO_TYPE)                                    \
   V(SCRIPT_TYPE)                                                \
   V(TYPE_FEEDBACK_INFO_TYPE)                                    \
   V(ALIASED_ARGUMENTS_ENTRY_TYPE)                               \
   V(PROMISE_RESOLVE_THENABLE_JOB_INFO_TYPE)                     \
   V(PROMISE_REACTION_JOB_INFO_TYPE)                             \
   V(DEBUG_INFO_TYPE)                                            \
   V(BREAK_POINT_INFO_TYPE)                                      \
+  V(STACK_FRAME_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(ASYNC_GENERATOR_REQUEST_TYPE)                               \
   V(FIXED_ARRAY_TYPE)                                           \
   V(TRANSITION_ARRAY_TYPE)                                      \
@@ skipping 151 matching lines @@
   V(ALLOCATION_MEMENTO, AllocationMemento, allocation_memento)               \
   V(SCRIPT, Script, script)                                                  \
   V(TYPE_FEEDBACK_INFO, TypeFeedbackInfo, type_feedback_info)                \
   V(ALIASED_ARGUMENTS_ENTRY, AliasedArgumentsEntry, aliased_arguments_entry) \
   V(PROMISE_RESOLVE_THENABLE_JOB_INFO, PromiseResolveThenableJobInfo,        \
     promise_resolve_thenable_job_info)                                       \
   V(PROMISE_REACTION_JOB_INFO, PromiseReactionJobInfo,                       \
     promise_reaction_job_info)                                               \
   V(DEBUG_INFO, DebugInfo, debug_info)                                       \
   V(BREAK_POINT_INFO, BreakPointInfo, break_point_info)                      \
+  V(STACK_FRAME_INFO, StackFrameInfo, stack_frame_info)                      \
   V(PROTOTYPE_INFO, PrototypeInfo, prototype_info)                           \
   V(TUPLE2, Tuple2, tuple2)                                                  \
   V(TUPLE3, Tuple3, tuple3)                                                  \
   V(CONTEXT_EXTENSION, ContextExtension, context_extension)                  \
   V(CONSTANT_ELEMENTS_PAIR, ConstantElementsPair, constant_elements_pair)    \
   V(MODULE, Module, module)                                                  \
   V(MODULE_INFO_ENTRY, ModuleInfoEntry, module_info_entry)                   \
   V(ASYNC_GENERATOR_REQUEST, AsyncGeneratorRequest, async_generator_request)
 
 // We use the full 8 bits of the instance_type field to encode heap object
@@ skipping 151 matching lines @@
   OBJECT_TEMPLATE_INFO_TYPE,
   ALLOCATION_SITE_TYPE,
   ALLOCATION_MEMENTO_TYPE,
   SCRIPT_TYPE,
   TYPE_FEEDBACK_INFO_TYPE,
   ALIASED_ARGUMENTS_ENTRY_TYPE,
   PROMISE_RESOLVE_THENABLE_JOB_INFO_TYPE,
   PROMISE_REACTION_JOB_INFO_TYPE,
   DEBUG_INFO_TYPE,
   BREAK_POINT_INFO_TYPE,
+  STACK_FRAME_INFO_TYPE,
   PROTOTYPE_INFO_TYPE,
   TUPLE2_TYPE,
   TUPLE3_TYPE,
   CONTEXT_EXTENSION_TYPE,
   CONSTANT_ELEMENTS_PAIR_TYPE,
   MODULE_TYPE,
   MODULE_INFO_ENTRY_TYPE,
   ASYNC_GENERATOR_REQUEST_TYPE,
   FIXED_ARRAY_TYPE,
   TRANSITION_ARRAY_TYPE,
@@ skipping 10564 matching lines @@
 
   static const int kSourcePositionIndex = Struct::kHeaderSize;
   static const int kBreakPointObjectsIndex =
       kSourcePositionIndex + kPointerSize;
   static const int kSize = kBreakPointObjectsIndex + kPointerSize;
 
  private:
   DISALLOW_IMPLICIT_CONSTRUCTORS(BreakPointInfo);
 };
 
+class StackFrameInfo : public Struct {
+ public:
+  DECL_INT_ACCESSORS(line_number)
+  DECL_INT_ACCESSORS(column_number)
+  DECL_INT_ACCESSORS(script_id)
+  DECL_ACCESSORS(script_name, Object)
+  DECL_ACCESSORS(script_name_or_source_url, Object)
+  DECL_ACCESSORS(function_name, Object)
+  DECL_BOOLEAN_ACCESSORS(is_eval)
+  DECL_BOOLEAN_ACCESSORS(is_constructor)
+  DECL_INT_ACCESSORS(flag)
+
+  DECLARE_CAST(StackFrameInfo)
+
+  // Dispatched behavior.
+  DECLARE_PRINTER(StackFrameInfo)
+  DECLARE_VERIFIER(StackFrameInfo)
+
+  static const int kLineNumberIndex = Struct::kHeaderSize;
+  static const int kColumnNumberIndex = kLineNumberIndex + kPointerSize;
+  static const int kScriptIdIndex = kColumnNumberIndex + kPointerSize;
+  static const int kScriptNameIndex = kScriptIdIndex + kPointerSize;
+  static const int kScriptNameOrSourceUrlIndex =
+      kScriptNameIndex + kPointerSize;
+  static const int kFunctionNameIndex =
+      kScriptNameOrSourceUrlIndex + kPointerSize;
+  static const int kFlagIndex = kFunctionNameIndex + kPointerSize;
+  static const int kSize = kFlagIndex + kPointerSize;
+
+ private:
+  // Bit position in the flag, from least significant bit position.
+  static const int kIsEvalBit = 0;
+  static const int kIsConstructorBit = 1;
+
+  DISALLOW_IMPLICIT_CONSTRUCTORS(StackFrameInfo);
+};
 
 #define VISITOR_SYNCHRONIZATION_TAGS_LIST(V)                               \
   V(kStringTable, "string_table", "(Internalized strings)")                \
   V(kExternalStringsTable, "external_strings_table", "(External strings)") \
   V(kStrongRootList, "strong_root_list", "(Strong roots)")                 \
   V(kSmiRootList, "smi_root_list", "(Smi roots)")                          \
   V(kBootstrapper, "bootstrapper", "(Bootstrapper)")                       \
   V(kTop, "top", "(Isolate)")                                              \
   V(kRelocatable, "relocatable", "(Relocatable)")                          \
   V(kDebug, "debug", "(Debugger)")                                         \
@@ skipping 103 matching lines @@
   }
 };
 
 
 }  // NOLINT, false-positive due to second-order macros.
 }  // NOLINT, false-positive due to second-order macros.
 
 #include "src/objects/object-macros-undef.h"
 
 #endif  // V8_OBJECTS_H_