Introduce v8::Exception::GetMessage to find location of an error object.

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 "include/v8-debug.h"
 #include "src/allocation.h"
 #include "src/assert-scope.h"
@@ skipping 783 matching lines @@
   Object* PromoteScheduledException();
   void DoThrow(Object* exception, MessageLocation* location);
   // Checks if exception should be reported and finds out if it's
   // caught externally.
   bool ShouldReportException(bool* can_be_caught_externally,
                              bool catchable_by_javascript);
 
   // Attempts to compute the current source location, storing the
   // result in the target out parameter.
   void ComputeLocation(MessageLocation* target);
+  void ComputeLocationFromStackTrace(MessageLocation* target,
+                                     Handle<Object> exception);
+
+  Handle<JSMessageObject> CreateMessage(Handle<Object> exception,
+                                        MessageLocation* location);
 
   // Out of resource exception helpers.
   Object* StackOverflow();
   Object* TerminateExecution();
   void CancelTerminateExecution();
 
   void InvokeApiInterruptCallback();
 
   // Administration
   void Iterate(ObjectVisitor* v);
@@ skipping 380 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();
 
-  Handle<JSMessageObject> CreateMessage(Handle<Object> exception,
-                                        MessageLocation* location);
-
   // 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 319 matching lines @@
   }
 
   EmbeddedVector<char, 128> filename_;
   FILE* file_;
   int scope_depth_;
 };
 
 } }  // namespace v8::internal
 
 #endif  // V8_ISOLATE_H_