Implement preprocessor code completion where a macro name is expected,

e.g., after #ifdef/#ifndef or #undef, or inside a defined <macroname>
expression in a preprocessor conditional.

llvm-svn: 111954

1 files changed, 7 insertions, 0 deletions

diff --git a/clang/lib/Lex/PPDirectives.cpp b/clang/lib/Lex/PPDirectives.cpp
index e0729f123f0..8da7def9ed4 100644
--- a/clang/lib/Lex/PPDirectives.cpp
+++ b/clang/lib/Lex/PPDirectives.cpp
@@ -75,6 +75,13 @@ void Preprocessor::ReadMacroName(Token &MacroNameTok, char isDefineUndef) {
   // Read the token, don't allow macro expansion on it.
   LexUnexpandedToken(MacroNameTok);
 
+  if (MacroNameTok.is(tok::code_completion)) {
+    if (CodeComplete)
+      CodeComplete->CodeCompleteMacroName(isDefineUndef == 1);
+    LexUnexpandedToken(MacroNameTok);
+    return;
+  }
+  
   // Missing macro name?
   if (MacroNameTok.is(tok::eom)) {
     Diag(MacroNameTok, diag::err_pp_missing_macro_name);