[objects] Extract DebugInfo and BreakPointInfo to own file

src/objects/debug-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_DEBUG_OBJECTS_H_
+#define V8_OBJECTS_DEBUG_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 {
+
+// The DebugInfo class holds additional information for a function being
+// debugged.
+class DebugInfo : public Struct {
+ public:
+  // The shared function info for the source being debugged.
+  DECL_ACCESSORS(shared, SharedFunctionInfo)
+
+  // Bit field containing various information collected for debugging.
+  DECL_INT_ACCESSORS(debugger_hints)
+
+  DECL_ACCESSORS(debug_bytecode_array, Object)
+  // Fixed array holding status information for each active break point.
+  DECL_ACCESSORS(break_points, FixedArray)
+
+  // Check if there is a break point at a source position.
+  bool HasBreakPoint(int source_position);
+  // Attempt to clear a break point. Return true if successful.
+  static bool ClearBreakPoint(Handle<DebugInfo> debug_info,
+                              Handle<Object> break_point_object);
+  // Set a break point.
+  static void SetBreakPoint(Handle<DebugInfo> debug_info, int source_position,
+                            Handle<Object> break_point_object);
+  // Get the break point objects for a source position.
+  Handle<Object> GetBreakPointObjects(int source_position);
+  // Find the break point info holding this break point object.
+  static Handle<Object> FindBreakPointInfo(Handle<DebugInfo> debug_info,
+                                           Handle<Object> break_point_object);
+  // Get the number of break points for this function.
+  int GetBreakPointCount();
+
+  inline bool HasDebugBytecodeArray();
+  inline bool HasDebugCode();
+
+  inline BytecodeArray* OriginalBytecodeArray();
+  inline BytecodeArray* DebugBytecodeArray();
+  inline Code* DebugCode();
+
+  DECLARE_CAST(DebugInfo)
+
+  // Dispatched behavior.
+  DECLARE_PRINTER(DebugInfo)
+  DECLARE_VERIFIER(DebugInfo)
+
+  static const int kSharedFunctionInfoIndex = Struct::kHeaderSize;
+  static const int kDebuggerHintsIndex =
+      kSharedFunctionInfoIndex + kPointerSize;
+  static const int kDebugBytecodeArrayIndex =
+      kDebuggerHintsIndex + kPointerSize;
+  static const int kBreakPointsStateIndex =
+      kDebugBytecodeArrayIndex + kPointerSize;
+  static const int kSize = kBreakPointsStateIndex + kPointerSize;
+
+  static const int kEstimatedNofBreakPointsInFunction = 4;
+
+ private:
+  // Get the break point info object for a source position.
+  Object* GetBreakPointInfo(int source_position);
+
+  DISALLOW_IMPLICIT_CONSTRUCTORS(DebugInfo);
+};
+
+// The BreakPointInfo class holds information for break points set in a
+// function. The DebugInfo object holds a BreakPointInfo object for each code
+// position with one or more break points.
+class BreakPointInfo : public Tuple2 {
+ public:
+  // The position in the source for the break position.
+  DECL_INT_ACCESSORS(source_position)
+  // List of related JavaScript break points.
+  DECL_ACCESSORS(break_point_objects, Object)
+
+  // Removes a break point.
+  static void ClearBreakPoint(Handle<BreakPointInfo> info,
+                              Handle<Object> break_point_object);
+  // Set a break point.
+  static void SetBreakPoint(Handle<BreakPointInfo> info,
+                            Handle<Object> break_point_object);
+  // Check if break point info has this break point object.
+  static bool HasBreakPointObject(Handle<BreakPointInfo> info,
+                                  Handle<Object> break_point_object);
+  // Get the number of break points for this code offset.
+  int GetBreakPointCount();
+
+  int GetStatementPosition(Handle<DebugInfo> debug_info);
+
+  DECLARE_CAST(BreakPointInfo)
+
+  static const int kSourcePositionIndex = kValue1Offset;
+  static const int kBreakPointObjectsIndex = kValue2Offset;
+
+ private:
+  DISALLOW_IMPLICIT_CONSTRUCTORS(BreakPointInfo);
+};
+
+}  // namespace internal
+}  // namespace v8
+
+#include "src/objects/object-macros-undef.h"
+
+#endif  // V8_OBJECTS_DEBUG_OBJECTS_H_