[runtime] split up loops with HandleScopes

src/isolate.cc

 // 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.
 
 #include "src/isolate.h"
 
 #include <stdlib.h>
 
 #include <fstream>  // NOLINT(readability/streams)
 #include <sstream>
@@ skipping 2765 matching lines @@
 
 void Isolate::RunMicrotasksInternal() {
   while (pending_microtask_count() > 0) {
     HandleScope scope(this);
     int num_tasks = pending_microtask_count();
     Handle<FixedArray> queue(heap()->microtask_queue(), this);
     DCHECK(num_tasks <= queue->length());
     set_pending_microtask_count(0);
     heap()->set_microtask_queue(heap()->empty_fixed_array());
 
-    for (int i = 0; i < num_tasks; i++) {
-      HandleScope scope(this);
+    Isolate* isolate = this;
+    FOR_WITH_HANDLE_SCOPE(isolate, int, i = 0, i, i < num_tasks, i++, {
       Handle<Object> microtask(queue->get(i), this);
       if (microtask->IsJSFunction()) {
         Handle<JSFunction> microtask_function =
             Handle<JSFunction>::cast(microtask);
         SaveContext save(this);
         set_context(microtask_function->context()->native_context());
         MaybeHandle<Object> maybe_exception;
         MaybeHandle<Object> result = Execution::TryCall(
             this, microtask_function, factory()->undefined_value(), 0, NULL,
             &maybe_exception);
         // If execution is terminating, just bail out.
         Handle<Object> exception;
         if (result.is_null() && maybe_exception.is_null()) {
           // Clear out any remaining callbacks in the queue.
           heap()->set_microtask_queue(heap()->empty_fixed_array());
           set_pending_microtask_count(0);
           return;
         }
       } else {
         Handle<CallHandlerInfo> callback_info =
             Handle<CallHandlerInfo>::cast(microtask);
         v8::MicrotaskCallback callback =
             v8::ToCData<v8::MicrotaskCallback>(callback_info->callback());
         void* data = v8::ToCData<void*>(callback_info->data());
         callback(data);
       }
-    }
+    });
   }
 }
 
 
 void Isolate::AddMicrotasksCompletedCallback(
     MicrotasksCompletedCallback callback) {
   for (int i = 0; i < microtasks_completed_callbacks_.length(); i++) {
     if (callback == microtasks_completed_callbacks_.at(i)) return;
   }
   microtasks_completed_callbacks_.Add(callback);
@@ skipping 150 matching lines @@
   // Then check whether this scope intercepts.
   if ((flag & intercept_mask_)) {
     intercepted_flags_ |= flag;
     return true;
   }
   return false;
 }
 
 }  // namespace internal
 }  // namespace v8