avoid copying strings.

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@40980 91177308-0d34-0410-b5e6-96231b3b80d8

diff --git a/include/llvm/PassManagers.h b/include/llvm/PassManagers.h
index 76302db4e9ebda60097c1e5285021de9b819b3f3..6467aaecd9e8314bd0e3b34e040c8b5982446ef2 100644 (file)
--- a/include/llvm/PassManagers.h
+++ b/include/llvm/PassManagers.h
@@ -218,7 +218,8 @@ public:
   void removeNotPreservedAnalysis(Pass *P);
   
   /// Remove dead passes
-  void removeDeadPasses(Pass *P, std::string Msg, enum PassDebuggingString);
+  void removeDeadPasses(Pass *P, const std::string &Msg,
+                        enum PassDebuggingString);
 
   /// Add pass P into the PassVector. Update 
   /// AvailableAnalysis appropriately if ProcessAnalysis is true.
@@ -273,7 +274,7 @@ public:
   void dumpLastUses(Pass *P, unsigned Offset) const;
   void dumpPassArguments() const;
   void dumpPassInfo(Pass *P, enum PassDebuggingString S1,
-                    enum PassDebuggingString S2, std::string Msg);
+                    enum PassDebuggingString S2, const std::string &Msg);
   void dumpAnalysisSetInfo(const char *Msg, Pass *P,
                            const std::vector<AnalysisID> &Set) const;
 

diff --git a/lib/VMCore/PassManager.cpp b/lib/VMCore/PassManager.cpp
index 7bdeeac022708994c57af726d2f0a2bf46be5a76..16477d58324a39c79e941198f4ce4e01f6cb01d1 100644 (file)
--- a/lib/VMCore/PassManager.cpp
+++ b/lib/VMCore/PassManager.cpp
@@ -650,7 +650,7 @@ void PMDataManager::removeNotPreservedAnalysis(Pass *P) {
 }
 
 /// Remove analysis passes that are not used any longer
-void PMDataManager::removeDeadPasses(Pass *P, std::string Msg,
+void PMDataManager::removeDeadPasses(Pass *P, const std::string &Msg,
                                      enum PassDebuggingString DBG_STR) {
 
   SmallVector<Pass *, 12> DeadPasses;
@@ -854,9 +854,9 @@ void PMDataManager::dumpPassArguments() const {
   }
 }
 
-void PMDataManager:: dumpPassInfo(Pass *P, enum PassDebuggingString S1,
-                                  enum PassDebuggingString S2,
-                                  std::string Msg) {
+void PMDataManager::dumpPassInfo(Pass *P, enum PassDebuggingString S1,
+                                 enum PassDebuggingString S2,
+                                 const std::string &Msg) {
   if (PassDebugging < Executions)
     return;
   cerr << (void*)this << std::string(getDepth()*2+1, ' ');