Restore message when rethrowing in TryCatch.

src/api.cc

 // Copyright 2012 the V8 project authors. All rights reserved.
 // Redistribution and use in source and binary forms, with or without
 // modification, are permitted provided that the following conditions are
 // met:
 //
 //     * Redistributions of source code must retain the above copyright
 //       notice, this list of conditions and the following disclaimer.
 //     * Redistributions in binary form must reproduce the above
 //       copyright notice, this list of conditions and the following
 //       disclaimer in the documentation and/or other materials provided
@@ skipping 2069 matching lines @@
   }
 }
 
 
 // --- E x c e p t i o n s ---
 
 
 v8::TryCatch::TryCatch()
     : isolate_(i::Isolate::Current()),
       next_(isolate_->try_catch_handler_address()),
-      exception_(isolate_->heap()->the_hole_value()),
-      message_(i::Smi::FromInt(0)),
       is_verbose_(false),
       can_continue_(true),
       capture_message_(true),
       rethrow_(false),
       has_terminated_(false) {
+  Reset();
   isolate_->RegisterTryCatchHandler(this);
 }
 
 
 v8::TryCatch::~TryCatch() {
   ASSERT(isolate_ == i::Isolate::Current());
   if (rethrow_) {
     v8::HandleScope scope(reinterpret_cast<Isolate*>(isolate_));
     v8::Local<v8::Value> exc = v8::Local<v8::Value>::New(Exception());
+    if (HasCaught() && capture_message_) {
+      // If an exception was caught and rethrow_ is indicated, the saved
+      // message, script, and location need to be restored to Isolate TLS
+      // for reuse.  capture_message_ needs to be disabled so that DoThrow()
+      // does not create a new message.
+      isolate_->thread_local_top()->rethrowing_message_ = true;
+      isolate_->RestorePendingMessageFromTryCatch(this);
+    }
     isolate_->UnregisterTryCatchHandler(this);
     v8::ThrowException(exc);
+    ASSERT(!isolate_->thread_local_top()->rethrowing_message_);
   } else {
     isolate_->UnregisterTryCatchHandler(this);
   }
 }
 
 
 bool v8::TryCatch::HasCaught() const {
   return !reinterpret_cast<i::Object*>(exception_)->IsTheHole();
 }
 
@@ skipping 40 matching lines @@
     if (value.is_null()) return v8::Local<Value>();
     return v8::Utils::ToLocal(scope.CloseAndEscape(value));
   } else {
     return v8::Local<Value>();
   }
 }
 
 
 v8::Local<v8::Message> v8::TryCatch::Message() const {
   ASSERT(isolate_ == i::Isolate::Current());
-  if (HasCaught() && message_ != i::Smi::FromInt(0)) {
-    i::Object* message = reinterpret_cast<i::Object*>(message_);
+  i::Object* message = reinterpret_cast<i::Object*>(message_obj_);
+  ASSERT(message->IsJSMessageObject() || message->IsTheHole());
+  if (HasCaught() && !message->IsTheHole()) {
     return v8::Utils::MessageToLocal(i::Handle<i::Object>(message, isolate_));
   } else {
     return v8::Local<v8::Message>();
   }
 }
 
 
 void v8::TryCatch::Reset() {
   ASSERT(isolate_ == i::Isolate::Current());
-  exception_ = isolate_->heap()->the_hole_value();
-  message_ = i::Smi::FromInt(0);
+  i::Object* the_hole = isolate_->heap()->the_hole_value();
+  exception_ = the_hole;
+  message_obj_ = the_hole;
+  message_script_ = the_hole;
+  message_start_pos_ = 0;
+  message_end_pos_ = 0;
 }
 
 
 void v8::TryCatch::SetVerbose(bool value) {
   is_verbose_ = value;
 }
 
 
 void v8::TryCatch::SetCaptureMessage(bool value) {
   capture_message_ = value;
@@ skipping 5800 matching lines @@
   Isolate* isolate = reinterpret_cast<Isolate*>(info.GetIsolate());
   Address callback_address =
       reinterpret_cast<Address>(reinterpret_cast<intptr_t>(callback));
   VMState<EXTERNAL> state(isolate);
   ExternalCallbackScope call_scope(isolate, callback_address);
   return callback(info);
 }
 
 
 } }  // namespace v8::internal