Provide diag_iterator for iterating over the built-in diagnostic IDs/names in the internal table of DiagnosticIDs.

llvm-svn: 137108

clang/include/clang/Basic/DiagnosticIDs.h

@@ -195,6 +195,25 @@ public:
   /// getFullExplanation - Given a diagnostic ID, return a full explanation
   /// of the issue
   static StringRef getFullExplanation(unsigned DiagID);
+  
+  /// Iterator class used for traversing all statically declared
+  /// diagnostics.
+  class diag_iterator {
+    const void *impl;
+
+    friend class DiagnosticIDs;    
+    diag_iterator(const void *im) : impl(im) {};    
+  public:
+    diag_iterator &operator++();
+    bool operator==(const diag_iterator &x) const { return impl == x.impl; }
+    bool operator!=(const diag_iterator &x) const { return impl != x.impl; }
+    
+    llvm::StringRef getDiagName() const;
+    unsigned getDiagID() const;    
+  };
+
+  static diag_iterator diags_begin();
+  static diag_iterator diags_end();
 
 private:
   /// setDiagnosticGroupMapping - Change an entire diagnostic group (e.g.

clang/lib/Basic/DiagnosticIDs.cpp

@@ -304,6 +304,35 @@ static unsigned getBuiltinDiagClass(unsigned DiagID) {
   return ~0U;
 }
 
+//===----------------------------------------------------------------------===//
+// diag_iterator
+//===----------------------------------------------------------------------===//
+
+llvm::StringRef DiagnosticIDs::diag_iterator::getDiagName() const {
+  return static_cast<const StaticDiagNameIndexRec*>(impl)->getName();
+}
+
+unsigned DiagnosticIDs::diag_iterator::getDiagID() const {
+  return static_cast<const StaticDiagNameIndexRec*>(impl)->DiagID;
+}
+
+DiagnosticIDs::diag_iterator &DiagnosticIDs::diag_iterator::operator++() {
+  const StaticDiagNameIndexRec* ptr =
+    static_cast<const StaticDiagNameIndexRec*>(impl);;
+  ++ptr;
+  impl = ptr;
+  return *this;
+}
+
+DiagnosticIDs::diag_iterator DiagnosticIDs::diags_begin() {
+  return DiagnosticIDs::diag_iterator(StaticDiagNameIndex);
+}
+
+DiagnosticIDs::diag_iterator DiagnosticIDs::diags_end() {
+  return DiagnosticIDs::diag_iterator(StaticDiagNameIndex +
+                                      StaticDiagNameIndexSize);
+}
+
 //===----------------------------------------------------------------------===//
 // Custom Diagnostic information
 //===----------------------------------------------------------------------===//