[api] Prototype WeakRef implementation

src/profiler/heap-snapshot-generator.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/profiler/heap-snapshot-generator.h"
 
 #include <utility>
 
 #include "src/api.h"
 #include "src/code-stubs.h"
@@ skipping 996 matching lines @@
 
   if (obj->IsJSGlobalProxy()) {
     ExtractJSGlobalProxyReferences(entry, JSGlobalProxy::cast(obj));
   } else if (obj->IsJSArrayBuffer()) {
     ExtractJSArrayBufferReferences(entry, JSArrayBuffer::cast(obj));
   } else if (obj->IsJSObject()) {
     if (obj->IsJSWeakSet()) {
       ExtractJSWeakCollectionReferences(entry, JSWeakSet::cast(obj));
     } else if (obj->IsJSWeakMap()) {
       ExtractJSWeakCollectionReferences(entry, JSWeakMap::cast(obj));
+    } else if (obj->IsJSWeakRef()) {
+      ExtractJSWeakRefReferences(entry, JSWeakRef::cast(obj));
     } else if (obj->IsJSSet()) {
       ExtractJSCollectionReferences(entry, JSSet::cast(obj));
     } else if (obj->IsJSMap()) {
       ExtractJSCollectionReferences(entry, JSMap::cast(obj));
     }
     ExtractJSObjectReferences(entry, JSObject::cast(obj));
   } else if (obj->IsString()) {
     ExtractStringReferences(entry, String::cast(obj));
   } else if (obj->IsSymbol()) {
     ExtractSymbolReferences(entry, Symbol::cast(obj));
@@ skipping 165 matching lines @@
 
 void V8HeapExplorer::ExtractJSWeakCollectionReferences(int entry,
                                                        JSWeakCollection* obj) {
   if (obj->table()->IsHashTable()) {
     ObjectHashTable* table = ObjectHashTable::cast(obj->table());
     TagFixedArraySubType(table, JS_WEAK_COLLECTION_SUB_TYPE);
   }
   SetInternalReference(obj, entry, "table", obj->table(),
                        JSWeakCollection::kTableOffset);
 }
+void V8HeapExplorer::ExtractJSWeakRefReferences(int entry,
+                                                       JSWeakRef* ref) {
+  SetInternalReference(ref, entry, "executor", ref->executor(),
+                       JSWeakRef::kExecutorOffset);
+  SetInternalReference(ref, entry, "target", ref->target(),
+                       JSWeakRef::kTargetOffset);
+  SetInternalReference(ref, entry, "holdings", ref->holdings(),
+                       JSWeakRef::kHoldingsOffset);
+}
 
 void V8HeapExplorer::ExtractContextReferences(int entry, Context* context) {
   if (context == context->declaration_context()) {
     ScopeInfo* scope_info = context->closure()->shared()->scope_info();
     // Add context allocated locals.
     int context_locals = scope_info->ContextLocalCount();
     for (int i = 0; i < context_locals; ++i) {
       String* local_name = scope_info->ContextLocalName(i);
       int idx = Context::MIN_CONTEXT_SLOTS + i;
       SetContextReference(context, entry, local_name, context->get(idx),
@@ skipping 1924 matching lines @@
   for (int i = 1; i < sorted_strings.length(); ++i) {
     writer_->AddCharacter(',');
     SerializeString(sorted_strings[i]);
     if (writer_->aborted()) return;
   }
 }
 
 
 }  // namespace internal
 }  // namespace v8