Move stack unwinding logic into the runtime.

src/runtime/runtime-internal.cc

 // Copyright 2014 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.
 
 #include "src/v8.h"
 
 #include "src/arguments.h"
 #include "src/bootstrapper.h"
 #include "src/debug.h"
 #include "src/messages.h"
 #include "src/parser.h"
 #include "src/prettyprinter.h"
 #include "src/runtime/runtime-utils.h"
 
 namespace v8 {
 namespace internal {
 
 RUNTIME_FUNCTION(Runtime_CheckIsBootstrapping) {
   SealHandleScope shs(isolate);
   DCHECK(args.length() == 0);
   RUNTIME_ASSERT(isolate->bootstrapper()->IsActive());
   return isolate->heap()->undefined_value();
 }
 
 
 RUNTIME_FUNCTION(Runtime_Throw) {
   HandleScope scope(isolate);
   DCHECK(args.length() == 1);
-
   return isolate->Throw(args[0]);
 }
 
 
 RUNTIME_FUNCTION(Runtime_ReThrow) {
   HandleScope scope(isolate);
   DCHECK(args.length() == 1);
+  return isolate->ReThrow(args[0]);
+}
 
-  return isolate->ReThrow(args[0]);
+
+RUNTIME_FUNCTION(Runtime_FindExceptionHandler) {
+  SealHandleScope shs(isolate);
+  DCHECK(args.length() == 0);
+  return isolate->FindHandler();
 }
 
 
 RUNTIME_FUNCTION(Runtime_PromoteScheduledException) {
   SealHandleScope shs(isolate);
   DCHECK(args.length() == 0);
   return isolate->PromoteScheduledException();
 }
 
 
@@ skipping 267 matching lines @@
 
 RUNTIME_FUNCTION(RuntimeReference_GetFromCache) {
   HandleScope scope(isolate);
   DCHECK(args.length() == 2);
   CONVERT_SMI_ARG_CHECKED(id, 0);
   args[0] = isolate->native_context()->jsfunction_result_caches()->get(id);
   return __RT_impl_Runtime_GetFromCache(args, isolate);
 }
 }
 }  // namespace v8::internal