DiagnosticIDs: use diagnostic severities to simplify extension handling

git-svn-id: https://llvm.org/svn/llvm-project/cfe/trunk@211479 91177308-0d34-0410-b5e6-96231b3b80d8

include/clang/Basic/Diagnostic.h

@@ -146,13 +146,6 @@ public:
     Fatal = DiagnosticIDs::Fatal
   };
 
-  /// \brief How do we handle otherwise-unmapped extension?
-  ///
-  /// This is controlled by -pedantic and -pedantic-errors.
-  enum ExtensionHandling {
-    Ext_Ignore, Ext_Warn, Ext_Error
-  };
-
   enum ArgumentKind {
     ak_std_string,      ///< std::string
     ak_c_string,        ///< const char *
@@ -190,7 +183,7 @@ private:
                                    // 0 -> no limit.
   unsigned ConstexprBacktraceLimit; // Cap on depth of constexpr evaluation
                                     // backtrace stack, 0 -> no limit.
-  ExtensionHandling ExtBehavior; // Map extensions onto warnings or errors?
+  diag::Severity ExtBehavior;       // Map extensions to warnings or errors?
   IntrusiveRefCntPtr<DiagnosticIDs> Diags;
   IntrusiveRefCntPtr<DiagnosticOptions> DiagOpts;
   DiagnosticConsumer *Client;
@@ -523,10 +516,8 @@ public:
   /// mapped onto ignore/warning/error. 
   ///
   /// This corresponds to the GCC -pedantic and -pedantic-errors option.
-  void setExtensionHandlingBehavior(ExtensionHandling H) {
-    ExtBehavior = H;
-  }
-  ExtensionHandling getExtensionHandlingBehavior() const { return ExtBehavior; }
+  void setExtensionHandlingBehavior(diag::Severity H) { ExtBehavior = H; }
+  diag::Severity getExtensionHandlingBehavior() const { return ExtBehavior; }
 
   /// \brief Counter bumped when an __extension__  block is/ encountered.
   ///

lib/Basic/Diagnostic.cpp

@@ -54,7 +54,7 @@ DiagnosticsEngine::DiagnosticsEngine(
   PrintTemplateTree = false;
   ShowColors = false;
   ShowOverloads = Ovl_All;
-  ExtBehavior = Ext_Ignore;
+  ExtBehavior = diag::Severity::Ignored;
 
   ErrorLimit = 0;
   TemplateBacktraceLimit = 0;

lib/Basic/DiagnosticIDs.cpp

@@ -440,23 +440,8 @@ DiagnosticIDs::getDiagnosticSeverity(unsigned DiagID, SourceLocation Loc,
 
   // For extension diagnostics that haven't been explicitly mapped, check if we
   // should upgrade the diagnostic.
-  if (IsExtensionDiag && !Mapping.isUser()) {
-    switch (Diag.ExtBehavior) {
-    case DiagnosticsEngine::Ext_Ignore:
-      break; 
-    case DiagnosticsEngine::Ext_Warn:
-      // Upgrade ignored diagnostics to warnings.
-      if (Result == diag::Severity::Ignored)
-        Result = diag::Severity::Warning;
-      break;
-    case DiagnosticsEngine::Ext_Error:
-      // Upgrade ignored or warning diagnostics to errors.
-      if (Result == diag::Severity::Ignored ||
-          Result == diag::Severity::Warning)
-        Result = diag::Severity::Error;
-      break;
-    }
-  }
+  if (IsExtensionDiag && !Mapping.isUser())
+    Result = std::max(Result, Diag.ExtBehavior);
 
   // At this point, ignored errors can no longer be upgraded.
   if (Result == diag::Severity::Ignored)

lib/Basic/Warnings.cpp

@@ -67,11 +67,11 @@ void clang::ProcessWarningOptions(DiagnosticsEngine &Diags,
   // extension diagnostics onto WARNING or ERROR unless the user has futz'd
   // around with them explicitly.
   if (Opts.PedanticErrors)
-    Diags.setExtensionHandlingBehavior(DiagnosticsEngine::Ext_Error);
+    Diags.setExtensionHandlingBehavior(diag::Severity::Error);
   else if (Opts.Pedantic)
-    Diags.setExtensionHandlingBehavior(DiagnosticsEngine::Ext_Warn);
+    Diags.setExtensionHandlingBehavior(diag::Severity::Warning);
   else
-    Diags.setExtensionHandlingBehavior(DiagnosticsEngine::Ext_Ignore);
+    Diags.setExtensionHandlingBehavior(diag::Severity::Ignored);
 
   SmallVector<diag::kind, 10> _Diags;
   const IntrusiveRefCntPtr< DiagnosticIDs > DiagIDs =

lib/Lex/PPMacroExpansion.cpp

@@ -1006,8 +1006,8 @@ static bool HasExtension(const Preprocessor &PP, const IdentifierInfo *II) {
 
   // If the use of an extension results in an error diagnostic, extensions are
   // effectively unavailable, so just return false here.
-  if (PP.getDiagnostics().getExtensionHandlingBehavior() ==
-      DiagnosticsEngine::Ext_Error)
+  if (PP.getDiagnostics().getExtensionHandlingBehavior() >=
+      diag::Severity::Error)
     return false;
 
   const LangOptions &LangOpts = PP.getLangOpts();

lib/Serialization/ASTReader.cpp

@@ -328,13 +328,11 @@ static bool checkDiagnosticGroupMappings(DiagnosticsEngine &StoredDiags,
   return false;
 }
 
-static DiagnosticsEngine::ExtensionHandling
-isExtHandlingFromDiagsError(DiagnosticsEngine &Diags) {
-  DiagnosticsEngine::ExtensionHandling Ext =
-      Diags.getExtensionHandlingBehavior();
-  if (Ext == DiagnosticsEngine::Ext_Warn && Diags.getWarningsAsErrors())
-    Ext = DiagnosticsEngine::Ext_Error;
-  return Ext;
+static bool isExtHandlingFromDiagsError(DiagnosticsEngine &Diags) {
+  diag::Severity Ext = Diags.getExtensionHandlingBehavior();
+  if (Ext == diag::Severity::Warning && Diags.getWarningsAsErrors())
+    return true;
+  return Ext >= diag::Severity::Error;
 }
 
 static bool checkDiagnosticMappings(DiagnosticsEngine &StoredDiags,