[Clang] Check PP presence when printing stats

Author: ecnelises

clang/lib/Frontend/FrontendAction.cpp

@@ -1120,10 +1120,14 @@ void FrontendAction::EndSourceFile() {
 
   if (CI.getFrontendOpts().ShowStats) {
     llvm::errs() << "\nSTATISTICS FOR '" << getCurrentFileOrBufferName() << "':\n";
-    CI.getPreprocessor().PrintStats();
-    CI.getPreprocessor().getIdentifierTable().PrintStats();
-    CI.getPreprocessor().getHeaderSearchInfo().PrintStats();
-    CI.getSourceManager().PrintStats();
+    if (CI.hasPreprocessor()) {
+      CI.getPreprocessor().PrintStats();
+      CI.getPreprocessor().getIdentifierTable().PrintStats();
+      CI.getPreprocessor().getHeaderSearchInfo().PrintStats();
+    }
+    if (CI.hasSourceManager()) {
+      CI.getSourceManager().PrintStats();
+    }
     llvm::errs() << "\n";
   }
 

clang/test/Frontend/print-stats.ll

@@ -0,0 +1,6 @@
+; RUN: %clang_cc1 -triple x86_64-unknown-linux-gnu -print-stats \
+; RUN:    -emit-llvm -x ir %s -o - 2>&1 | FileCheck %s
+
+; CHECK: *** Source Manager Stats
+; CHECK: *** File Manager Stats
+; CHECK: *** Virtual File System Stats