Add 'remark' diagnostic type in 'clang'

A 'remark' is information that is not an error or a warning, but rather some
additional information provided to the user. In contrast to a 'note' a 'remark'
is an independent diagnostic, whereas a 'note' always depends on another
diagnostic.

A typical use case for remark nodes is information provided to the user, e.g.
information provided by the vectorizer about loops that have been vectorized.

This patch provides the initial implementation of 'remarks'. It includes the
actual definiton of the remark nodes, their printing as well as basic parameter
handling. We are reusing the existing diagnostic parameters which means a remark
can be enabled with normal '-Wdiagnostic-name' flags and can be upgraded to
an error using '-Werror=diagnostic-name'. '-Werror' alone does not upgrade
remarks.

This patch is by intention minimal in terms of parameter handling. More
experience and more discussions will most likely lead to further enhancements
in the parameter handling.

git-svn-id: https://llvm.org/svn/llvm-project/cfe/trunk@202475 91177308-0d34-0410-b5e6-96231b3b80d8

1 files changed, 9 insertions, 8 deletions

diff --git a/include/clang/Basic/DiagnosticIDs.h b/include/clang/Basic/DiagnosticIDs.h
index 0152f25fa6..f9b845606b 100644
--- a/include/clang/Basic/DiagnosticIDs.h
+++ b/include/clang/Basic/DiagnosticIDs.h
@@ -56,16 +56,17 @@ namespace clang {
     };
 
     /// Enum values that allow the client to map NOTEs, WARNINGs, and EXTENSIONs
-    /// to either MAP_IGNORE (nothing), MAP_WARNING (emit a warning), MAP_ERROR
-    /// (emit as an error).  It allows clients to map errors to
-    /// MAP_ERROR/MAP_DEFAULT or MAP_FATAL (stop emitting diagnostics after this
-    /// one).
+    /// to either MAP_IGNORE (nothing), MAP_REMARK (emit a remark), MAP_WARNING
+    /// (emit a warning), MAP_ERROR (emit as an error).  It allows clients to
+    /// map errors to MAP_ERROR/MAP_DEFAULT or MAP_FATAL (stop emitting
+    /// diagnostics after this one).
     enum Mapping {
       // NOTE: 0 means "uncomputed".
       MAP_IGNORE  = 1,     ///< Map this diagnostic to nothing, ignore it.
-      MAP_WARNING = 2,     ///< Map this diagnostic to a warning.
-      MAP_ERROR   = 3,     ///< Map this diagnostic to an error.
-      MAP_FATAL   = 4      ///< Map this diagnostic to a fatal error.
+      MAP_REMARK  = 2,     ///< Map this diagnostic to a remark.
+      MAP_WARNING = 3,     ///< Map this diagnostic to a warning.
+      MAP_ERROR   = 4,     ///< Map this diagnostic to an error.
+      MAP_FATAL   = 5      ///< Map this diagnostic to a fatal error.
     };
   }
 
@@ -113,7 +114,7 @@ class DiagnosticIDs : public RefCountedBase<DiagnosticIDs> {
 public:
   /// \brief The level of the diagnostic, after it has been through mapping.
   enum Level {
-    Ignored, Note, Warning, Error, Fatal
+    Ignored, Note, Remark, Warning, Error, Fatal
   };
 
 private: