Introduce new AST statistics that keep track of the number of isa (or

dyn_cast) invocations for C++ and Objective-C types, declarations,
expressions, and statements. The statistics will be printed when
-print-stats is provided to Clang -cc1, with results such as:

277073 clang - Number of checks for C++ declaration nodes
 13311 clang - Number of checks for C++ expression nodes
    18 clang - Number of checks for C++ statement nodes
174182 clang - Number of checks for C++ type nodes
 92300 clang - Number of checks for Objective-C declaration nodes
  9800 clang - Number of checks for Objective-C expression nodes
     7 clang - Number of checks for Objective-C statement nodes
 65733 clang - Number of checks for Objective-C type nodes

The statistics are only gathered when NDEBUG is not defined, since
they introduce potentially-expensive operations into very low-level
routines (isa).

llvm-svn: 99912

1 files changed, 7 insertions, 0 deletions

diff --git a/clang/lib/AST/DeclBase.cpp b/clang/lib/AST/DeclBase.cpp
index c693e153dda..522875f64f2 100644
--- a/clang/lib/AST/DeclBase.cpp
+++ b/clang/lib/AST/DeclBase.cpp
@@ -35,6 +35,13 @@ using namespace clang;
 //  Statistics
 //===----------------------------------------------------------------------===//
 
+#ifndef NDEBUG
+llvm::Statistic clang::objc_decl_checks = 
+  { "clang", "Number of checks for Objective-C declaration nodes", 0, 0 };
+llvm::Statistic clang::cxx_decl_checks = 
+  { "clang", "Number of checks for C++ declaration nodes", 0, 0 };
+#endif
+
 #define DECL(Derived, Base) static int n##Derived##s = 0;
 #include "clang/AST/DeclNodes.def"