CodeGen: Emit warnings for out of date profile data during PGO

This adds a warning that triggers when profile data doesn't match for
the source that's being compiled with -fprofile-instr-use=. This fires
only once per translation unit, as warning on every mismatched
function would be quite noisy.

llvm-svn: 206322

1 files changed, 8 insertions, 2 deletions

diff --git a/clang/lib/CodeGen/CodeGenPGO.cpp b/clang/lib/CodeGen/CodeGenPGO.cpp
index 55a09e8db52..c451bef57c5 100644
--- a/clang/lib/CodeGen/CodeGenPGO.cpp
+++ b/clang/lib/CodeGen/CodeGenPGO.cpp
@@ -908,11 +908,17 @@ void CodeGenPGO::emitCounterIncrement(CGBuilderTy &Builder, unsigned Counter) {
 }
 
 void CodeGenPGO::loadRegionCounts(PGOProfileData *PGOData) {
+  CGM.getPGOStats().Visited++;
   RegionCounts.reset(new std::vector<uint64_t>);
   uint64_t Hash;
-  if (PGOData->getFunctionCounts(getFuncName(), Hash, *RegionCounts) ||
-      Hash != FunctionHash || RegionCounts->size() != NumRegionCounters)
+  if (PGOData->getFunctionCounts(getFuncName(), Hash, *RegionCounts)) {
+    CGM.getPGOStats().Missing++;
     RegionCounts.reset();
+  } else if (Hash != FunctionHash ||
+             RegionCounts->size() != NumRegionCounters) {
+    CGM.getPGOStats().Mismatched++;
+    RegionCounts.reset();
+  }
 }
 
 void CodeGenPGO::destroyRegionCounters() {