[async-iteration] implement Async-from-Sync Iterator

src/objects-debug.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/objects.h"
 
 #include "src/bootstrapper.h"
 #include "src/disasm.h"
 #include "src/disassembler.h"
 #include "src/field-type.h"
@@ skipping 179 matching lines @@
     case JS_FAST_HOLEY_SMI_ARRAY_VALUE_ITERATOR_TYPE:
     case JS_FAST_DOUBLE_ARRAY_VALUE_ITERATOR_TYPE:
     case JS_FAST_HOLEY_DOUBLE_ARRAY_VALUE_ITERATOR_TYPE:
     case JS_GENERIC_ARRAY_VALUE_ITERATOR_TYPE:
       JSArrayIterator::cast(this)->JSArrayIteratorVerify();
       break;
 
     case JS_STRING_ITERATOR_TYPE:
       JSStringIterator::cast(this)->JSStringIteratorVerify();
       break;
+    case JS_ASYNC_FROM_SYNC_ITERATOR_TYPE:
+      JSAsyncFromSyncIterator::cast(this)->JSAsyncFromSyncIteratorVerify();
+      break;
     case JS_WEAK_MAP_TYPE:
       JSWeakMap::cast(this)->JSWeakMapVerify();
       break;
     case JS_WEAK_SET_TYPE:
       JSWeakSet::cast(this)->JSWeakSetVerify();
       break;
     case JS_PROMISE_CAPABILITY_TYPE:
       JSPromiseCapability::cast(this)->JSPromiseCapabilityVerify();
       break;
     case JS_PROMISE_TYPE:
@@ skipping 673 matching lines @@
 
 void JSStringIterator::JSStringIteratorVerify() {
   CHECK(IsJSStringIterator());
   JSObjectVerify();
   CHECK(string()->IsString());
 
   CHECK_GE(index(), 0);
   CHECK_LE(index(), String::kMaxLength);
 }
 
+void JSAsyncFromSyncIterator::JSAsyncFromSyncIteratorVerify() {
+  CHECK(IsJSAsyncFromSyncIterator());
+  JSObjectVerify();
+  VerifyHeapPointer(sync_iterator());
+}
+
 void JSWeakSet::JSWeakSetVerify() {
   CHECK(IsJSWeakSet());
   JSObjectVerify();
   VerifyHeapPointer(table());
   CHECK(table()->IsHashTable() || table()->IsUndefined(GetIsolate()));
 }
 
 void JSPromiseCapability::JSPromiseCapabilityVerify() {
   CHECK(IsJSPromiseCapability());
   JSObjectVerify();
@@ skipping 660 matching lines @@
 
   // Both are done at the same time.
   CHECK_EQ(new_it.done(), old_it.done());
 }
 
 
 #endif  // DEBUG
 
 }  // namespace internal
 }  // namespace v8