Reduce boilerplace for common pattern to return MaybeHandle.

src/runtime/runtime-strings.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/runtime/runtime-utils.h"
 
 #include "src/arguments.h"
 #include "src/regexp/jsregexp-inl.h"
 #include "src/string-builder.h"
 #include "src/string-search.h"
@@ skipping 295 matching lines @@
   return *isolate->factory()->NewSubString(string, start, end);
 }
 
 
 RUNTIME_FUNCTION(Runtime_StringAdd) {
   HandleScope scope(isolate);
   DCHECK(args.length() == 2);
   CONVERT_ARG_HANDLE_CHECKED(String, str1, 0);
   CONVERT_ARG_HANDLE_CHECKED(String, str2, 1);
   isolate->counters()->string_add_runtime()->Increment();
-  Handle<String> result;
-  ASSIGN_RETURN_FAILURE_ON_EXCEPTION(
-      isolate, result, isolate->factory()->NewConsString(str1, str2));
-  return *result;
+  RETURN_RESULT_OR_FAILURE(isolate,
+                           isolate->factory()->NewConsString(str1, str2));
 }
 
 
 RUNTIME_FUNCTION(Runtime_InternalizeString) {
   HandleScope handles(isolate);
   RUNTIME_ASSERT(args.length() == 1);
   CONVERT_ARG_HANDLE_CHECKED(String, string, 0);
   return *isolate->factory()->InternalizeString(string);
 }
 
@@ skipping 803 matching lines @@
   return *SeqString::Truncate(string, new_length);
 }
 
 
 RUNTIME_FUNCTION(Runtime_NewString) {
   HandleScope scope(isolate);
   DCHECK(args.length() == 2);
   CONVERT_INT32_ARG_CHECKED(length, 0);
   CONVERT_BOOLEAN_ARG_CHECKED(is_one_byte, 1);
   if (length == 0) return isolate->heap()->empty_string();
-  Handle<String> result;
   if (is_one_byte) {
-    ASSIGN_RETURN_FAILURE_ON_EXCEPTION(
-        isolate, result, isolate->factory()->NewRawOneByteString(length));
+    RETURN_RESULT_OR_FAILURE(isolate,
+                             isolate->factory()->NewRawOneByteString(length));
   } else {
-    ASSIGN_RETURN_FAILURE_ON_EXCEPTION(
-        isolate, result, isolate->factory()->NewRawTwoByteString(length));
+    RETURN_RESULT_OR_FAILURE(isolate,
+                             isolate->factory()->NewRawTwoByteString(length));
   }
-  return *result;
 }
 
 
 RUNTIME_FUNCTION(Runtime_StringLessThan) {
   HandleScope handle_scope(isolate);
   DCHECK_EQ(2, args.length());
   CONVERT_ARG_HANDLE_CHECKED(String, x, 0);
   CONVERT_ARG_HANDLE_CHECKED(String, y, 1);
   switch (String::Compare(x, y)) {
     case ComparisonResult::kLessThan:
@@ skipping 161 matching lines @@
   SealHandleScope shs(isolate);
   DCHECK(args.length() == 2);
   if (!args[0]->IsString()) return isolate->heap()->undefined_value();
   if (!args[1]->IsNumber()) return isolate->heap()->undefined_value();
   if (std::isinf(args.number_at(1))) return isolate->heap()->nan_value();
   return __RT_impl_Runtime_StringCharCodeAtRT(args, isolate);
 }
 
 }  // namespace internal
 }  // namespace v8