[inspector] introduced v8::debug::EntriesPreview for inspector

src/runtime/runtime-collections.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/conversions-inl.h"
 #include "src/factory.h"
 
@@ skipping 215 matching lines @@
   return *isolate->factory()->NewJSArrayWithElements(details);
 }
 
 
 RUNTIME_FUNCTION(Runtime_GetWeakMapEntries) {
   HandleScope scope(isolate);
   DCHECK_EQ(2, args.length());
   CONVERT_ARG_HANDLE_CHECKED(JSWeakCollection, holder, 0);
   CONVERT_NUMBER_CHECKED(int, max_entries, Int32, args[1]);
   CHECK(max_entries >= 0);
-
-  Handle<ObjectHashTable> table(ObjectHashTable::cast(holder->table()));
-  if (max_entries == 0 || max_entries > table->NumberOfElements()) {
-    max_entries = table->NumberOfElements();
-  }
-  Handle<FixedArray> entries =
-      isolate->factory()->NewFixedArray(max_entries * 2);
-  // Allocation can cause GC can delete weak elements. Reload.
-  if (max_entries > table->NumberOfElements()) {
-    max_entries = table->NumberOfElements();
-  }
-
-  {
-    DisallowHeapAllocation no_gc;
-    int count = 0;
-    for (int i = 0; count / 2 < max_entries && i < table->Capacity(); i++) {
-      Handle<Object> key(table->KeyAt(i), isolate);
-      if (table->IsKey(isolate, *key)) {
-        entries->set(count++, *key);
-        Object* value = table->Lookup(key);
-        entries->set(count++, value);
-      }
-    }
-    DCHECK_EQ(max_entries * 2, count);
-  }
-  return *isolate->factory()->NewJSArrayWithElements(entries);
+  return *JSWeakCollection::GetEntries(holder, max_entries);
 }
 
 
 RUNTIME_FUNCTION(Runtime_MapIteratorNext) {
   SealHandleScope shs(isolate);
   DCHECK_EQ(2, args.length());
   CONVERT_ARG_CHECKED(JSMapIterator, holder, 0);
   CONVERT_ARG_CHECKED(JSArray, value_array, 1);
   return holder->Next(value_array);
 }
@@ skipping 69 matching lines @@
   return *weak_collection;
 }
 
 
 RUNTIME_FUNCTION(Runtime_GetWeakSetValues) {
   HandleScope scope(isolate);
   DCHECK_EQ(2, args.length());
   CONVERT_ARG_HANDLE_CHECKED(JSWeakCollection, holder, 0);
   CONVERT_NUMBER_CHECKED(int, max_values, Int32, args[1]);
   CHECK(max_values >= 0);
-
-  Handle<ObjectHashTable> table(ObjectHashTable::cast(holder->table()));
-  if (max_values == 0 || max_values > table->NumberOfElements()) {
-    max_values = table->NumberOfElements();
-  }
-  Handle<FixedArray> values = isolate->factory()->NewFixedArray(max_values);
-  // Recompute max_values because GC could have removed elements from the table.
-  if (max_values > table->NumberOfElements()) {
-    max_values = table->NumberOfElements();
-  }
-  {
-    DisallowHeapAllocation no_gc;
-    int count = 0;
-    for (int i = 0; count < max_values && i < table->Capacity(); i++) {
-      Object* key = table->KeyAt(i);
-      if (table->IsKey(isolate, key)) values->set(count++, key);
-    }
-    DCHECK_EQ(max_values, count);
-  }
-  return *isolate->factory()->NewJSArrayWithElements(values);
+  return *JSWeakCollection::GetEntries(holder, max_values);
 }
 }  // namespace internal
 }  // namespace v8