Since PassRegistry is currently a shared global object, it needs locking. While it might intuitively seem

that all the setup of this class currently happens at static initialization time, this misses the fact
that some later events can cause mutation of the PassRegistrationListeners list, and thus cause race issues.


git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@114036 91177308-0d34-0410-b5e6-96231b3b80d8

include/llvm/PassRegistry.h

@@ -18,6 +18,7 @@
 #define LLVM_PASSREGISTRY_H
 
 #include "llvm/ADT/StringRef.h"
+#include "llvm/System/Mutex.h"
 
 namespace llvm {
 
@@ -32,6 +33,7 @@ struct PassRegistrationListener;
 /// each thread.
 class PassRegistry {
   mutable void *pImpl;
+  mutable sys::SmartMutex<true> Lock;
   void *getImpl() const;
    
 public: