[deoptimizer] When deoptimizing code, unlink all functions referring to that code.

src/deoptimizer.h

 // Copyright 2012 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_DEOPTIMIZER_H_
 #define V8_DEOPTIMIZER_H_
 
 #include "src/allocation.h"
 #include "src/deoptimize-reason.h"
 #include "src/macro-assembler.h"
@@ skipping 335 matching lines @@
     int frame_index_;
     int value_index_;
   };
   std::deque<ObjectPosition> object_positions_;
 };
 
 
 class OptimizedFunctionVisitor BASE_EMBEDDED {
  public:
   virtual ~OptimizedFunctionVisitor() {}
-
-  // Function which is called before iteration of any optimized functions
-  // from given native context.
-  virtual void EnterContext(Context* context) = 0;
-
   virtual void VisitFunction(JSFunction* function) = 0;
-
-  // Function which is called after iteration of all optimized functions
-  // from given native context.
-  virtual void LeaveContext(Context* context) = 0;
 };
 
 class Deoptimizer : public Malloced {
  public:
   enum BailoutType { EAGER, LAZY, SOFT, kLastBailoutType = SOFT };
 
   enum class BailoutState {
     NO_REGISTERS,
     TOS_REGISTER,
   };
@@ skipping 93 matching lines @@
 
   // Deoptimizes all optimized code that has been previously marked
   // (via code->set_marked_for_deoptimization) and unlinks all functions that
   // refer to that code.
   static void DeoptimizeMarkedCode(Isolate* isolate);
 
   // Visit all the known optimized functions in a given isolate.
   static void VisitAllOptimizedFunctions(
       Isolate* isolate, OptimizedFunctionVisitor* visitor);
 
+  static void UnlinkOptimizedCode(Code* code, Context* native_context);
+
   // The size in bytes of the code required at a lazy deopt patch site.
   static int patch_size();
 
   ~Deoptimizer();
 
   void MaterializeHeapObjects(JavaScriptFrameIterator* it);
 
   static void ComputeOutputFrames(Deoptimizer* deoptimizer);
 
 
@@ skipping 618 matching lines @@
   std::vector<Handle<Object> > expression_stack_;
   int source_position_;
 
   friend class Deoptimizer;
 };
 
 }  // namespace internal
 }  // namespace v8
 
 #endif  // V8_DEOPTIMIZER_H_