blink_gc_plugin: detect singletons with embedded ScriptWrappables.

tools/clang/blink_gc_plugin/RecordInfo.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 provides a wrapper for CXXRecordDecl that accumulates GC related
 // information about a class. Accumulated information is memoized and the info
 // objects are stored in a RecordCache.
 
 #ifndef TOOLS_BLINK_GC_PLUGIN_RECORD_INFO_H_
 #define TOOLS_BLINK_GC_PLUGIN_RECORD_INFO_H_
@@ skipping 100 matching lines @@
   bool RequiresTraceMethod();
   bool NeedsFinalization();
   bool DeclaresGCMixinMethods();
   bool DeclaresLocalTraceMethod();
   TracingStatus NeedsTracing(Edge::NeedsTracingOption);
   clang::CXXMethodDecl* InheritsNonVirtualTrace();
   bool IsConsideredAbstract();
 
   static clang::CXXRecordDecl* GetDependentTemplatedDecl(const clang::Type&);
 
+  // If |RecordInfo| represents blink::(CrossThread)Persistent<T>, return
+  // its type. |is_persistent| is set to |true| if the base type name is

[dcheng, 2017/02/16 04:35:51]

Make this match the actual param name? =)

[sof, 2017/02/16 06:45:34]

Updated to use version N naming, not (N-1). :)

+  // |Persistent| (or |CrossThreadPersistent|.)
+  const clang::Type* GetPersistentArgumentType(bool& has_persistent_name);
+
+  RecordCache* cache() const { return cache_; }
+
+  // Returns |true| if type is declared in "blink::"
+  bool IsInBlinkNamespace();
+
  private:
   RecordInfo(clang::CXXRecordDecl* record, RecordCache* cache);
 
   void walkBases();
 
   Fields* CollectFields();
   Bases* CollectBases();
   void DetermineTracingMethods();
   bool InheritsTrace();
 
@@ skipping 68 matching lines @@
   clang::CompilerInstance& instance() const { return instance_; }
 
  private:
   clang::CompilerInstance& instance_;
 
   typedef std::map<clang::CXXRecordDecl*, RecordInfo> Cache;
   Cache cache_;
 };
 
 #endif  // TOOLS_BLINK_GC_PLUGIN_RECORD_INFO_H_