CodeGen: Include a function hash in instrumentation based profiling

The hash itself is still the number of counters, which isn't all that
useful, but this separates the API changes from the actual
implementation of the hash and will make it easier to transition to
the ProfileData library once it's implemented.

llvm-svn: 204186

1 files changed, 6 insertions, 4 deletions

diff --git a/clang/lib/CodeGen/CodeGenPGO.h b/clang/lib/CodeGen/CodeGenPGO.h
index 2f1fe5dba8a..e859324ae08 100644
--- a/clang/lib/CodeGen/CodeGenPGO.h
+++ b/clang/lib/CodeGen/CodeGenPGO.h
@@ -42,7 +42,8 @@ public:
   PGOProfileData(CodeGenModule &CGM, std::string Path);
   /// Fill Counts with the profile data for the given function name. Returns
   /// false on success.
-  bool getFunctionCounts(StringRef FuncName, std::vector<uint64_t> &Counts);
+  bool getFunctionCounts(StringRef FuncName, uint64_t &FuncHash,
+                         std::vector<uint64_t> &Counts);
   /// Return the maximum of all known function counts.
   uint64_t getMaximumFunctionCount() { return MaxFunctionCount; }
 };
@@ -57,6 +58,7 @@ private:
   llvm::GlobalValue::LinkageTypes FuncLinkage;
 
   unsigned NumRegionCounters;
+  uint64_t FunctionHash;
   llvm::GlobalVariable *RegionCounters;
   llvm::DenseMap<const Stmt*, unsigned> *RegionCounterMap;
   llvm::DenseMap<const Stmt*, uint64_t> *StmtCountMap;
@@ -65,9 +67,9 @@ private:
 
 public:
   CodeGenPGO(CodeGenModule &CGM)
-    : CGM(CGM), PrefixedFuncName(0), NumRegionCounters(0), RegionCounters(0),
-      RegionCounterMap(0), StmtCountMap(0), RegionCounts(0),
-      CurrentRegionCount(0) {}
+      : CGM(CGM), PrefixedFuncName(0), NumRegionCounters(0), FunctionHash(0),
+        RegionCounters(0), RegionCounterMap(0), StmtCountMap(0),
+        RegionCounts(0), CurrentRegionCount(0) {}
   ~CodeGenPGO() {
     if (PrefixedFuncName) delete PrefixedFuncName;
   }