PPCallbacks::MacroUndefined, change signature and add test.

Summary:
The PPCallbacks::MacroUndefined callback is currently insufficient for clients that need to track the MacroDirectives.
This patch adds an additional argument to PPCallbacks::MacroUndefined that is the undef MacroDirective.

Reviewers: bruno, manmanren

Reviewed By: bruno

Subscribers: nemanjai, cfe-commits

Differential Revision: https://reviews.llvm.org/D29923

llvm-svn: 301449

1 files changed, 4 insertions, 2 deletions

diff --git a/clang/lib/Frontend/PrintPreprocessedOutput.cpp b/clang/lib/Frontend/PrintPreprocessedOutput.cpp
index d48b952ef20..3168b3da70a 100644
--- a/clang/lib/Frontend/PrintPreprocessedOutput.cpp
+++ b/clang/lib/Frontend/PrintPreprocessedOutput.cpp
@@ -172,7 +172,8 @@ public:
 
   /// MacroUndefined - This hook is called whenever a macro #undef is seen.
   void MacroUndefined(const Token &MacroNameTok,
-                      const MacroDefinition &MD) override;
+                      const MacroDefinition &MD,
+                      const MacroDirective *Undef) override;
 };
 }  // end anonymous namespace
 
@@ -389,7 +390,8 @@ void PrintPPOutputPPCallbacks::MacroDefined(const Token &MacroNameTok,
 }
 
 void PrintPPOutputPPCallbacks::MacroUndefined(const Token &MacroNameTok,
-                                              const MacroDefinition &MD) {
+                                              const MacroDefinition &MD,
+                                              const MacroDirective *Undef) {
   // Only print out macro definitions in -dD mode.
   if (!DumpDefines) return;