blink_gc_plugin: detect singletons with embedded ScriptWrappables.

tools/clang/blink_gc_plugin/Config.h

 // Copyright 2014 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 // This file defines the names used by GC infrastructure.
 
 // TODO: Restructure the name determination to use fully qualified names (ala,
 // blink::Foo) so that the plugin can be enabled for all of chromium. Doing so
 // would allow us to catch errors with structures outside of blink that might
 // have unsafe pointers to GC allocated blink structures.
@@ skipping 127 matching lines @@
   static bool IsGCFinalizedBase(const std::string& name) {
     return name == "GarbageCollectedFinalized";
   }
 
   static bool IsGCBase(const std::string& name) {
     return name == "GarbageCollected" ||
            IsGCFinalizedBase(name) ||
            IsGCMixinBase(name);
   }
 
+  static bool IsScriptWrappable(const std::string& name) {
+    return name == "ScriptWrappable";
+  }
+
   static bool IsIterator(const std::string& name) {
     return name == kIteratorName || name == kConstIteratorName ||
            name == kReverseIteratorName || name == kConstReverseIteratorName;
   }
 
   // Returns true of the base classes that do not need a vtable entry for trace
   // because they cannot possibly initiate a GC during construction.
   static bool IsSafePolymorphicBase(const std::string& name) {
     return IsGCBase(name) || IsRefCountedBase(name);
   }
 
-  static bool IsAnnotated(clang::Decl* decl, const std::string& anno) {
-    clang::AnnotateAttr* attr = decl->getAttr<clang::AnnotateAttr>();
-    return attr && (attr->getAnnotation() == anno);
-  }
+  static bool IsAnnotated(clang::Decl* decl, const std::string& anno);
 
   static bool IsStackAnnotated(clang::Decl* decl) {
     return IsAnnotated(decl, "blink_stack_allocated");
   }
 
+  static bool IsStaticSingleton(clang::Decl* decl) {
+    return IsAnnotated(decl, "blink_gc_singleton_type");
+  }
+
   static bool IsIgnoreAnnotated(clang::Decl* decl) {
     return IsAnnotated(decl, "blink_gc_plugin_ignore");
   }
 
   static bool IsIgnoreCycleAnnotated(clang::Decl* decl) {
     return IsAnnotated(decl, "blink_gc_plugin_ignore_cycle") ||
            IsIgnoreAnnotated(decl);
   }
 
   static bool IsVisitor(const std::string& name) {
@@ skipping 77 matching lines @@
     if (suffix.size() > str.size())
       return false;
     return str.compare(str.size() - suffix.size(), suffix.size(), suffix) == 0;
   }
 
   // Test if a template specialization is an instantiation.
   static bool IsTemplateInstantiation(clang::CXXRecordDecl* record);
 };
 
 #endif  // TOOLS_BLINK_GC_PLUGIN_CONFIG_H_