class PassRegistry {
mutable sys::SmartRWMutex<true> Lock;
+ /// Only if false, synchronization must use the Lock mutex.
+ std::atomic<bool> locked;
+
/// PassInfoMap - Keep track of the PassInfo object for each registered pass.
typedef DenseMap<const void *, const PassInfo *> MapType;
MapType PassInfoMap;
std::vector<PassRegistrationListener *> Listeners;
public:
- PassRegistry() {}
+ PassRegistry() : locked(false) {}
~PassRegistry();
/// getPassRegistry - Access the global registry object, which is
/// llvm_shutdown.
static PassRegistry *getPassRegistry();
+ /// Enables fast thread synchronization in getPassInfo().
+ /// After calling lock() no more passes may be registered.
+ void lock() { locked = true; }
+
/// getPassInfo - Look up a pass' corresponding PassInfo, indexed by the pass'
/// type identifier (&MyPass::ID).
const PassInfo *getPassInfo(const void *TI) const;