Ensure the debugger keeps a reference to code objects

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"
@@ skipping 56 matching lines @@
   friend class Debugger;
   DISALLOW_COPY_AND_ASSIGN(SourceBreakpoint);
 };
 
 
 // CodeBreakpoint represents a location in compiled code. There may be
 // more than one CodeBreakpoint for one SourceBreakpoint, e.g. when a
 // function gets compiled as a regular function and as a closure.
 class CodeBreakpoint {
  public:
-  CodeBreakpoint(const Function& func, intptr_t pc_desc_index);
+  CodeBreakpoint(const Code& code, intptr_t pc_desc_index);
   ~CodeBreakpoint();
 
-  RawFunction* function() const { return function_; }
+  RawFunction* function() const;
   uword pc() const { return pc_; }
   intptr_t token_pos() const { return token_pos_; }
   bool IsInternal() const { return src_bpt_ == NULL; }
 
   RawScript* SourceCode();
   RawString* SourceUrl();
   intptr_t LineNumber();
 
   void Enable();
   void Disable();
   bool IsEnabled() const { return is_enabled_; }
 
   uword OrigStubAddress() const;
 
  private:
   void VisitObjectPointers(ObjectPointerVisitor* visitor);
 
   SourceBreakpoint* src_bpt() const { return src_bpt_; }
   void set_src_bpt(SourceBreakpoint* value) { src_bpt_ = value; }
 
   void set_next(CodeBreakpoint* value) { next_ = value; }
   CodeBreakpoint* next() const { return this->next_; }
   intptr_t pc_desc_index() const { return pc_desc_index_; }
 
   void PatchCode();
   void RestoreCode();
 
-  RawFunction* function_;
+  RawCode* code_;
   intptr_t pc_desc_index_;
   intptr_t token_pos_;
   uword pc_;
   intptr_t line_number_;
   bool is_enabled_;
 
   SourceBreakpoint* src_bpt_;
   CodeBreakpoint* next_;
 
   PcDescriptors::Kind breakpoint_kind_;
@@ skipping 357 matching lines @@
 
   friend class Isolate;
   friend class SourceBreakpoint;
   DISALLOW_COPY_AND_ASSIGN(Debugger);
 };
 
 
 }  // namespace dart
 
 #endif  // VM_DEBUGGER_H_