Partially implement DBC profiler.

runtime/vm/simulator_dbc.h

 // Copyright (c) 2016, 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_SIMULATOR_DBC_H_
 #define VM_SIMULATOR_DBC_H_
 
 #ifndef VM_SIMULATOR_H_
 #error Do not include simulator_dbc.h directly; use simulator.h.
 #endif
@@ skipping 32 matching lines @@
   ~Simulator();
 
   // The currently executing Simulator instance, which is associated to the
   // current isolate
   static Simulator* Current();
 
   // Accessors to the internal simulator stack base and top.
   uword StackBase() const { return reinterpret_cast<uword>(stack_); }
   uword StackTop() const;
 
-  // The isolate's top_exit_frame_info refers to a Dart frame in the simulator
+  // The thread's top_exit_frame_info refers to a Dart frame in the simulator
   // stack. The simulator's top_exit_frame_info refers to a C++ frame in the
   // native stack.
   uword top_exit_frame_info() const { return top_exit_frame_info_; }
   void set_top_exit_frame_info(uword value) { top_exit_frame_info_ = value; }
 
   // Call on program start.
   static void InitOnce();
 
   RawObject* Call(const Code& code,
                   const Array& arguments_descriptor,
                   const Array& arguments,
                   Thread* thread);
 
   void Longjmp(uword pc,
                uword sp,
                uword fp,
                RawObject* raw_exception,
                RawObject* raw_stacktrace,
                Thread* thread);
 
-  uword get_sp() const {
-    return reinterpret_cast<uword>(sp_);
-  }
+  uword get_sp() const { return reinterpret_cast<uword>(sp_); }
+  uword get_fp() const { return reinterpret_cast<uword>(fp_); }
+  uword get_pc() const { return reinterpret_cast<uword>(pc_); }
 
   enum IntrinsicId {
 #define V(test_class_name, test_function_name, enum_name, type, fp) \
     k##enum_name##Intrinsic,
   ALL_INTRINSICS_LIST(V)
   GRAPH_INTRINSICS_LIST(V)
 #undef V
     kIntrinsicCount,
   };
 
@@ skipping 79 matching lines @@
     last_setjmp_buffer_ = buffer;
   }
 
   friend class SimulatorSetjmpBuffer;
   DISALLOW_COPY_AND_ASSIGN(Simulator);
 };
 
 }  // namespace dart
 
 #endif  // VM_SIMULATOR_DBC_H_