[deoptimizer] Materialize string iterators.

src/deoptimizer.cc

 // Copyright 2013 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/deoptimizer.h"
 
 #include <memory>
 
 #include "src/accessors.h"
 #include "src/ast/prettyprinter.h"
@@ skipping 3720 matching lines @@
       Handle<Object> iterated_object = materializer.FieldAt(value_index);
       Handle<Object> next_index = materializer.FieldAt(value_index);
       Handle<Object> iterated_object_map = materializer.FieldAt(value_index);
       object->set_properties(FixedArray::cast(*properties));
       object->set_elements(FixedArrayBase::cast(*elements));
       object->set_object(*iterated_object);
       object->set_index(*next_index);
       object->set_object_map(*iterated_object_map);
       return object;
     }
+    case JS_STRING_ITERATOR_TYPE: {
+      Handle<JSStringIterator> object = Handle<JSStringIterator>::cast(
+          isolate_->factory()->NewJSObjectFromMap(map, NOT_TENURED));
+      slot->value_ = object;
+      // Initialize the index to zero to make the heap verifier happy.
+      object->set_index(0);
+      Handle<Object> properties = materializer.FieldAt(value_index);
+      Handle<Object> elements = materializer.FieldAt(value_index);
+      Handle<Object> iterated_string = materializer.FieldAt(value_index);
+      Handle<Object> next_index = materializer.FieldAt(value_index);
+      object->set_properties(FixedArray::cast(*properties));
+      object->set_elements(FixedArrayBase::cast(*elements));
+      CHECK(iterated_string->IsString());
+      object->set_string(String::cast(*iterated_string));
+      CHECK(next_index->IsSmi());
+      object->set_index(Smi::cast(*next_index)->value());
+      return object;
+    }
     case JS_ARRAY_TYPE: {
       Handle<JSArray> object = Handle<JSArray>::cast(
           isolate_->factory()->NewJSObjectFromMap(map, NOT_TENURED));
       slot->value_ = object;
       Handle<Object> properties = materializer.FieldAt(value_index);
       Handle<Object> elements = materializer.FieldAt(value_index);
       Handle<Object> length = materializer.FieldAt(value_index);
       object->set_properties(FixedArray::cast(*properties));
       object->set_elements(FixedArrayBase::cast(*elements));
       object->set_length(*length);
@@ skipping 128 matching lines @@
     case JS_GENERATOR_OBJECT_TYPE:
     case JS_MODULE_NAMESPACE_TYPE:
     case JS_ARRAY_BUFFER_TYPE:
     case JS_REGEXP_TYPE:
     case JS_TYPED_ARRAY_TYPE:
     case JS_DATA_VIEW_TYPE:
     case JS_SET_TYPE:
     case JS_MAP_TYPE:
     case JS_SET_ITERATOR_TYPE:
     case JS_MAP_ITERATOR_TYPE:
-    case JS_STRING_ITERATOR_TYPE:
     case JS_WEAK_MAP_TYPE:
     case JS_WEAK_SET_TYPE:
     case JS_PROMISE_CAPABILITY_TYPE:
     case JS_PROMISE_TYPE:
     case JS_BOUND_FUNCTION_TYPE:
     case JS_PROXY_TYPE:
     case MAP_TYPE:
     case ALLOCATION_SITE_TYPE:
     case ACCESSOR_INFO_TYPE:
     case SHARED_FUNCTION_INFO_TYPE:
@@ skipping 268 matching lines @@
       CHECK(value_info->IsMaterializedObject());
 
       value_info->value_ =
           Handle<Object>(previously_materialized_objects->get(i), isolate_);
     }
   }
 }
 
 }  // namespace internal
 }  // namespace v8