Add a check to the FindBadConstructs.cpp clang plugin for bad enum last values.

tools/clang/plugins/ChromeClassTester.cpp

 // Copyright (c) 2012 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.
 
 // A general interface for filtering and only acting on classes in Chromium C++
 // code.
 
 #include "ChromeClassTester.h"
 
 #include <sys/param.h>
@@ skipping 75 matching lines @@
     std::string base_name = record->getNameAsString();
     if (IsIgnoredType(base_name))
       return;
 
     // We ignore all classes that end with "Matcher" because they're probably
     // GMock artifacts.
     if (ends_with(base_name, "Matcher"))
         return;
 
     CheckChromeClass(record_location, record);
+  } else if (EnumDecl* enum_decl = dyn_cast<EnumDecl>(tag)) {
+    SourceLocation enum_location = enum_decl->getInnerLocStart();
+    if (InBannedDirectory(enum_location))
+      return;
+
+    std::string base_name = enum_decl->getNameAsString();
+    if (IsIgnoredType(base_name))
+      return;
+
+    CheckChromeEnum(enum_location, enum_decl);
   }
 }
 
 void ChromeClassTester::emitWarning(SourceLocation loc,
                                     const char* raw_error) {
   FullSourceLoc full(loc, instance().getSourceManager());
   std::string err;
   err = "[chromium-style] ";
   err += raw_error;
   DiagnosticsEngine::Level level =
@@ skipping 87 matching lines @@
   ignored_record_names_.insert("AutocompleteController");
   ignored_record_names_.insert("HistoryURLProvider");
 
   // Because of chrome frame
   ignored_record_names_.insert("ReliabilityTestSuite");
 
   // Used over in the net unittests. A large enough bundle of integers with 1
   // non-pod class member. Probably harmless.
   ignored_record_names_.insert("MockTransaction");
 
+  // Enum type with _LAST members where _LAST doesn't mean last enum value.
+  ignored_record_names_.insert("ServerFieldType");
+
   // Used heavily in ui_unittests and once in views_unittests. Fixing this
   // isn't worth the overhead of an additional library.
   ignored_record_names_.insert("TestAnimationDelegate");
 
   // Part of our public interface that nacl and friends use. (Arguably, this
   // should mean that this is a higher priority but fixing this looks hard.)
   ignored_record_names_.insert("PluginVersionInfo");
 
   // Measured performance improvement on cc_perftests. See
   // https://codereview.chromium.org/11299290/
   ignored_record_names_.insert("QuadF");
+
+  // Enum type with _LAST members where _LAST doesn't mean last enum value.
+  ignored_record_names_.insert("ViewID");
 }
 
 std::string ChromeClassTester::GetNamespaceImpl(const DeclContext* context,
                                                 const std::string& candidate) {
   switch (context->getDeclKind()) {
     case Decl::TranslationUnit: {
       return candidate;
     }
     case Decl::Namespace: {
       const NamespaceDecl* decl = dyn_cast<NamespaceDecl>(context);
@@ skipping 73 matching lines @@
   PresumedLoc ploc = source_manager.getPresumedLoc(spelling_location);
   if (ploc.isInvalid()) {
     // If we're in an invalid location, we're looking at things that aren't
     // actually stated in the source.
     return false;
   }
 
   *filename = ploc.getFilename();
   return true;
 }