Allow the debugger to inspect local variables from optimized and

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 "include/dart_debugger_api.h"
 
 #include "vm/object.h"
 #include "vm/port.h"
 
 namespace dart {
 
-class SourceBreakpoint;
+class ActiveVariables;
 class CodeBreakpoint;
 class Isolate;
 class ObjectPointerVisitor;
-class ActiveVariables;
 class RemoteObjectCache;
+class SourceBreakpoint;
+class StackFrame;
 
 // 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_pos);
 
   RawFunction* function() const { return function_; }
   intptr_t token_pos() const { return token_pos_; }
@@ skipping 105 matching lines @@
     return code_;
   }
 
   RawString* QualifiedFunctionName();
   RawString* SourceUrl();
   RawScript* SourceScript();
   RawLibrary* Library();
   intptr_t TokenPos();
   intptr_t LineNumber();
   void SetContext(const Context& ctx) { ctx_ = ctx.raw(); }
+  void SetDeoptFrame(const Array& deopt_frame, intptr_t deopt_frame_offset) {
+    deopt_frame_ = deopt_frame.raw();
+    deopt_frame_offset_ = deopt_frame_offset;
+  }
 
   // Returns true if this frame is for a function that is visible
   // to the user and can be debugged.
   bool IsDebuggable() const;
 
   // The context level of a frame is the context level at the
   // PC/token index of the frame. It determines the depth of the context
   // chain that belongs to the function of this activation frame.
   intptr_t ContextLevel();
 
   const char* ToCString();
 
   intptr_t NumLocalVariables();
 
   void VariableAt(intptr_t i,
                   String* name,
                   intptr_t* token_pos,
                   intptr_t* end_pos,
                   Instance* value);
 
   RawArray* GetLocalVariables();
   RawContext* GetSavedEntryContext(const Context& ctx);
+  RawContext* GetSavedEntryContextNew();
   RawContext* GetSavedCurrentContext();
 
  private:
   intptr_t PcDescIndex();
   intptr_t TryIndex();
   void GetPcDescriptors();
   void GetVarDescriptors();
   void GetDescIndices();
+
+  RawObject* GetLocalVar(intptr_t slot_index);
+  RawInstance* GetLocalInstanceVar(intptr_t slot_index);
+  RawContext* GetLocalContextVar(intptr_t slot_index);
+
   RawInstance* GetLocalVarValue(intptr_t slot_index);
   RawInstance* GetInstanceCallReceiver(intptr_t num_actual_args);
   RawObject* GetClosureObject(intptr_t num_acatual_args);
 
   uword pc_;
   uword fp_;
   uword sp_;
 
   // The anchor of the context chain for this function.
   Context& ctx_;
   const Code& code_;
   const Function& function_;
   intptr_t token_pos_;
   intptr_t pc_desc_index_;
   intptr_t line_number_;
   intptr_t context_level_;
 
+  // Some frames are deoptimized into a side array in order to inspect them.
+  Array& deopt_frame_;
+  intptr_t deopt_frame_offset_;
+
   bool vars_initialized_;
   LocalVarDescriptors& var_descriptors_;
   ZoneGrowableArray<intptr_t> desc_indices_;
   PcDescriptors& pc_desc_;
 
   friend class Debugger;
   friend class DebuggerStackTrace;
   DISALLOW_COPY_AND_ASSIGN(ActivationFrame);
 };
 
@@ skipping 152 matching lines @@
   void MakeCodeBreakpointsAt(const Function& func,
                              intptr_t token_pos,
                              SourceBreakpoint* bpt);
   // Returns NULL if no breakpoint exists for the given address.
   CodeBreakpoint* GetCodeBreakpoint(uword breakpoint_address);
 
   void SyncBreakpoint(SourceBreakpoint* bpt);
 
   ActivationFrame* TopDartFrame() const;
   static DebuggerStackTrace* CollectStackTrace();
+  static ActivationFrame* CollectDartFrame(Isolate* isolate,
+                                           uword pc,
+                                           StackFrame* frame,
+                                           const Code& code,
+                                           bool optimized,
+                                           ActivationFrame* callee_activation,
+                                           const Context& entry_ctx);
+  static RawArray* DeoptimizeToArray(Isolate* isolate,
+                                     StackFrame* frame,
+                                     const Code& code);
+  static DebuggerStackTrace* CollectStackTraceNew();
   void SignalBpResolved(SourceBreakpoint *bpt);
   void SignalPausedEvent(ActivationFrame* top_frame);
 
   intptr_t nextId() { return next_id_++; }
 
   bool ShouldPauseOnException(DebuggerStackTrace* stack_trace,
                               const Instance& exc);
 
   void CollectLibraryFields(const GrowableObjectArray& field_list,
                             const Library& lib,
@@ skipping 33 matching lines @@
 
   friend class Isolate;
   friend class SourceBreakpoint;
   DISALLOW_COPY_AND_ASSIGN(Debugger);
 };
 
 
 }  // namespace dart
 
 #endif  // VM_DEBUGGER_H_