Remove materialized objects on stack unwind.

src/isolate.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_ISOLATE_H_
 #define V8_ISOLATE_H_
 
 #include <queue>
 #include "include/v8-debug.h"
 #include "src/allocation.h"
@@ skipping 746 matching lines @@
     Throw(*exception, location);
     return MaybeHandle<T>();
   }
 
   // Re-throw an exception.  This involves no error reporting since error
   // reporting was handled when the exception was thrown originally.
   Object* ReThrow(Object* exception);
 
   // Find the correct handler for the current pending exception. This also
   // clears and returns the current pending exception.
-  Object* FindHandler();
+  Object* UnwindAndFindHandler();
 
   // Tries to predict whether an exception will be caught. Note that this can
   // only produce an estimate, because it is undecidable whether a finally
   // clause will consume or re-throw an exception. We conservatively assume any
   // finally clause will behave as if the exception were consumed.
   enum CatchType { NOT_CAUGHT, CAUGHT_BY_JAVASCRIPT, CAUGHT_BY_EXTERNAL };
   CatchType PredictExceptionCatcher();
 
   void ScheduleThrow(Object* exception);
   // Re-set pending message, script and positions reported to the TryCatch
@@ skipping 469 matching lines @@
   void MarkCompactEpilogue(bool is_compacting,
                            ThreadLocalTop* archived_thread_data);
 
   void FillCache();
 
   // Propagate pending exception message to the v8::TryCatch.
   // If there is no external try-catch or message was successfully propagated,
   // then return true.
   bool PropagatePendingExceptionToExternalTryCatch();
 
+  // Remove per-frame stored materialized objects when we are unwinding
+  // the frame.
+  void RemoveMaterializedObjectsOnUnwind(StackFrame* frame);
+
   // Traverse prototype chain to find out whether the object is derived from
   // the Error object.
   bool IsErrorObject(Handle<Object> obj);
 
   base::Atomic32 id_;
   EntryStackItem* entry_stack_;
   int stack_trace_nesting_level_;
   StringStream* incomplete_message_;
   Address isolate_addresses_[kIsolateAddressCount + 1];  // NOLINT
   Bootstrapper* bootstrapper_;
@@ skipping 332 matching lines @@
   }
 
   EmbeddedVector<char, 128> filename_;
   FILE* file_;
   int scope_depth_;
 };
 
 } }  // namespace v8::internal
 
 #endif  // V8_ISOLATE_H_