Introduce remote objects in Debugger protocol

runtime/vm/debugger.h

 // Copyright (c) 2012, the Dart project authors.  Please see the AUTHORS file
 // for details. All rights reserved. Use of this source code is governed by a
 // BSD-style license that can be found in the LICENSE file.
 
 #ifndef VM_DEBUGGER_H_
 #define VM_DEBUGGER_H_
 
 #include "vm/object.h"
 
 namespace dart {
 
 class SourceBreakpoint;
 class CodeBreakpoint;
 class Isolate;
 class ObjectPointerVisitor;
 class ActiveVariables;
-
+class RemoteObjectCache;
 
 // SourceBreakpoint represents a user-specified breakpoint location in
 // Dart source. There may be more than one CodeBreakpoint object per
 // SourceBreakpoint.
 class SourceBreakpoint {
  public:
   SourceBreakpoint(intptr_t id, const Function& func, intptr_t token_index);
 
   RawFunction* function() const { return function_; }
   intptr_t token_index() const { return token_index_; }
@@ skipping 119 matching lines @@
   RawInstance* GetLocalVarValue(intptr_t slot_index);
   RawInstance* GetInstanceCallReceiver(intptr_t num_actual_args);
 
   uword pc_;
   uword fp_;
   uword sp_;
   Function& function_;
   intptr_t token_index_;
   intptr_t line_number_;
 
-  LocalVarDescriptors* var_descriptors_;
+  LocalVarDescriptors& var_descriptors_;
   ZoneGrowableArray<intptr_t> desc_indices_;
 
   friend class Debugger;
   DISALLOW_COPY_AND_ASSIGN(ActivationFrame);
 };
 
 
 // Array of function activations on the call stack.
 class DebuggerStackTrace : public ZoneAllocated {
  public:
@@ skipping 11 matching lines @@
 
   friend class Debugger;
   DISALLOW_COPY_AND_ASSIGN(DebuggerStackTrace);
 };
 
 
 typedef void BreakpointHandler(SourceBreakpoint* bpt,
                                DebuggerStackTrace* stack);
 
 
-
 class Debugger {
  public:
   enum EventType {
     kPaused = 1,
     kBreakpointResolved = 2,
   };
   struct DebuggerEvent {
     EventType type;
     union {
       DebuggerStackTrace* stack_trace;
@@ skipping 33 matching lines @@
   void VisitObjectPointers(ObjectPointerVisitor* visitor);
 
   // Called from Runtime when a breakpoint in Dart code is reached.
   void BreakpointCallback();
 
   DebuggerStackTrace* StackTrace() const { return stack_trace_; }
 
   RawArray* GetInstanceFields(const Instance& obj);
   RawArray* GetStaticFields(const Class& cls);
 
+  intptr_t CacheObject(const Object& obj);
+  RawObject* GetCachedObject(intptr_t obj_id);
+  bool IsValidObjectId(intptr_t obj_id);
+
   // Utility functions.
   static const char* QualifiedFunctionName(const Function& func);
 
   RawObject* GetInstanceField(const Class& cls,
                               const String& field_name,
                               const Instance& object);
   RawObject* GetStaticField(const Class& cls,
                             const String& field_name);
 
  private:
@@ skipping 30 matching lines @@
   bool initialized_;
   BreakpointHandler* bp_handler_;
   EventHandler* event_handler_;
 
   // ID number generator.
   intptr_t next_id_;
 
   // Current stack trace. Valid while executing breakpoint callback code.
   DebuggerStackTrace* stack_trace_;
 
+  RemoteObjectCache* obj_cache_;
+
   SourceBreakpoint* src_breakpoints_;
   CodeBreakpoint* code_breakpoints_;
 
   // Tells debugger what to do when resuming execution after a breakpoint.
   ResumeAction resume_action_;
 
   // Do not call back to breakpoint handler if this flag is set.
   // Effectively this means ignoring breakpoints. Set when Dart code may
   // be run as a side effect of getting values of fields.
   bool ignore_breakpoints_;
 
   friend class SourceBreakpoint;
   DISALLOW_COPY_AND_ASSIGN(Debugger);
 };
 
 
 }  // namespace dart
 
 #endif  // VM_DEBUGGER_H_