Replace Execution Engine's mutex with std::recursive_mutex.

This change has a bit of a trickle down effect due to the fact that
there are a number of derived implementations of ExecutionEngine,
and that the mutex is not tightly encapsulated so is used by other
classes directly.

Reviewed by: rnk

Differential Revision: http://reviews.llvm.org/D4196

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@211214 91177308-0d34-0410-b5e6-96231b3b80d8

include/llvm/ExecutionEngine/ExecutionEngine.h

@@ -22,10 +22,10 @@
 #include "llvm/IR/ValueMap.h"
 #include "llvm/MC/MCCodeGenInfo.h"
 #include "llvm/Support/ErrorHandling.h"
-#include "llvm/Support/Mutex.h"
 #include "llvm/Target/TargetMachine.h"
 #include "llvm/Target/TargetOptions.h"
 #include <map>
+#include <mutex>
 #include <string>
 #include <vector>
 
@@ -42,7 +42,6 @@ class JITEventListener;
 class JITMemoryManager;
 class MachineCodeInfo;
 class Module;
-class MutexGuard;
 class ObjectCache;
 class RTDyldMemoryManager;
 class Triple;
@@ -59,7 +58,7 @@ class ExecutionEngineState {
 public:
   struct AddressMapConfig : public ValueMapConfig<const GlobalValue*> {
     typedef ExecutionEngineState *ExtraData;
-    static sys::Mutex *getMutex(ExecutionEngineState *EES);
+    static std::recursive_mutex *getMutex(ExecutionEngineState *EES);
     static void onDelete(ExecutionEngineState *EES, const GlobalValue *Old);
     static void onRAUW(ExecutionEngineState *, const GlobalValue *,
                        const GlobalValue *);
@@ -164,7 +163,7 @@ public:
   /// lock - This lock protects the ExecutionEngine, MCJIT, JIT, JITResolver and
   /// JITEmitter classes.  It must be held while changing the internal state of
   /// any of those classes.
-  sys::Mutex lock;
+  std::recursive_mutex lock;
 
   //===--------------------------------------------------------------------===//
   //  ExecutionEngine Startup

include/llvm/IR/ValueMap.h

@@ -28,9 +28,9 @@
 
 #include "llvm/ADT/DenseMap.h"
 #include "llvm/IR/ValueHandle.h"
-#include "llvm/Support/Mutex.h"
 #include "llvm/Support/type_traits.h"
 #include <iterator>
+#include <mutex>
 
 namespace llvm {
 
@@ -45,7 +45,7 @@ class ValueMapConstIterator;
 /// This class defines the default behavior for configurable aspects of
 /// ValueMap<>.  User Configs should inherit from this class to be as compatible
 /// as possible with future versions of ValueMap.
-template<typename KeyT, typename MutexT = sys::Mutex>
+template<typename KeyT, typename MutexT = std::recursive_mutex>
 struct ValueMapConfig {
   typedef MutexT mutex_type;
 
@@ -216,11 +216,11 @@ public:
     ValueMapCallbackVH Copy(*this);
     typename Config::mutex_type *M = Config::getMutex(Copy.Map->Data);
     if (M)
-      M->acquire();
+      M->lock();
     Config::onDelete(Copy.Map->Data, Copy.Unwrap());  // May destroy *this.
     Copy.Map->Map.erase(Copy);  // Definitely destroys *this.
     if (M)
-      M->release();
+      M->unlock();
   }
   void allUsesReplacedWith(Value *new_key) override {
     assert(isa<KeySansPointerT>(new_key) &&
@@ -229,7 +229,7 @@ public:
     ValueMapCallbackVH Copy(*this);
     typename Config::mutex_type *M = Config::getMutex(Copy.Map->Data);
     if (M)
-      M->acquire();
+      M->lock();
 
     KeyT typed_new_key = cast<KeySansPointerT>(new_key);
     // Can destroy *this:
@@ -245,7 +245,7 @@ public:
       }
     }
     if (M)
-      M->release();
+      M->unlock();
   }
 };
 

lib/ExecutionEngine/ExecutionEngine.cpp

@@ -166,7 +166,7 @@ void *ExecutionEngineState::RemoveMapping(const GlobalValue *ToUnmap) {
 }
 
 void ExecutionEngine::addGlobalMapping(const GlobalValue *GV, void *Addr) {
-  MutexGuard locked(lock);
+  std::lock_guard<std::recursive_mutex> locked(lock);
 
   DEBUG(dbgs() << "JIT: Map \'" << GV->getName()
         << "\' to [" << Addr << "]\n";);
@@ -184,14 +184,14 @@ void ExecutionEngine::addGlobalMapping(const GlobalValue *GV, void *Addr) {
 }
 
 void ExecutionEngine::clearAllGlobalMappings() {
-  MutexGuard locked(lock);
+  std::lock_guard<std::recursive_mutex> locked(lock);
 
   EEState.getGlobalAddressMap().clear();
   EEState.getGlobalAddressReverseMap().clear();
 }
 
 void ExecutionEngine::clearGlobalMappingsFromModule(Module *M) {
-  MutexGuard locked(lock);
+  std::lock_guard<std::recursive_mutex> locked(lock);
 
   for (Module::iterator FI = M->begin(), FE = M->end(); FI != FE; ++FI)
     EEState.RemoveMapping(FI);
@@ -201,7 +201,7 @@ void ExecutionEngine::clearGlobalMappingsFromModule(Module *M) {
 }
 
 void *ExecutionEngine::updateGlobalMapping(const GlobalValue *GV, void *Addr) {
-  MutexGuard locked(lock);
+  std::lock_guard<std::recursive_mutex> locked(lock);
 
   ExecutionEngineState::GlobalAddressMapTy &Map =
     EEState.getGlobalAddressMap();
@@ -228,7 +228,7 @@ void *ExecutionEngine::updateGlobalMapping(const GlobalValue *GV, void *Addr) {
 }
 
 void *ExecutionEngine::getPointerToGlobalIfAvailable(const GlobalValue *GV) {
-  MutexGuard locked(lock);
+  std::lock_guard<std::recursive_mutex> locked(lock);
 
   ExecutionEngineState::GlobalAddressMapTy::iterator I =
     EEState.getGlobalAddressMap().find(GV);
@@ -236,7 +236,7 @@ void *ExecutionEngine::getPointerToGlobalIfAvailable(const GlobalValue *GV) {
 }
 
 const GlobalValue *ExecutionEngine::getGlobalValueAtAddress(void *Addr) {
-  MutexGuard locked(lock);
+  std::lock_guard<std::recursive_mutex> locked(lock);
 
   // If we haven't computed the reverse mapping yet, do so first.
   if (EEState.getGlobalAddressReverseMap().empty()) {
@@ -555,7 +555,7 @@ void *ExecutionEngine::getPointerToGlobal(const GlobalValue *GV) {
   if (Function *F = const_cast<Function*>(dyn_cast<Function>(GV)))
     return getPointerToFunction(F);
 
-  MutexGuard locked(lock);
+  std::lock_guard<std::recursive_mutex> locked(lock);
   if (void *P = EEState.getGlobalAddressMap()[GV])
     return P;
 
@@ -1346,7 +1346,7 @@ ExecutionEngineState::ExecutionEngineState(ExecutionEngine &EE)
   : EE(EE), GlobalAddressMap(this) {
 }
 
-sys::Mutex *
+std::recursive_mutex *
 ExecutionEngineState::AddressMapConfig::getMutex(ExecutionEngineState *EES) {
   return &EES->EE.lock;
 }

lib/ExecutionEngine/JIT/JIT.cpp

@@ -96,18 +96,18 @@ namespace {
 /// bugpoint or gdb users to search for a function by name without any context.
 class JitPool {
   SmallPtrSet<JIT*, 1> JITs;  // Optimize for process containing just 1 JIT.
-  mutable sys::Mutex Lock;
+  mutable std::recursive_mutex Lock;
 public:
   void Add(JIT *jit) {
-    MutexGuard guard(Lock);
+    std::lock_guard<std::recursive_mutex> guard(Lock);
     JITs.insert(jit);
   }
   void Remove(JIT *jit) {
-    MutexGuard guard(Lock);
+    std::lock_guard<std::recursive_mutex> guard(Lock);
     JITs.erase(jit);
   }
   void *getPointerToNamedFunction(const char *Name) const {
-    MutexGuard guard(Lock);
+    std::lock_guard<std::recursive_mutex> guard(Lock);
     assert(JITs.size() != 0 && "No Jit registered");
     //search function in every instance of JIT
     for (SmallPtrSet<JIT*, 1>::const_iterator Jit = JITs.begin(),
@@ -150,7 +150,7 @@ JIT::JIT(Module *M, TargetMachine &tm, TargetJITInfo &tji,
   AllJits->Add(this);
 
   // Add target data
-  MutexGuard locked(lock);
+  std::lock_guard<std::recursive_mutex> locked(lock);
   FunctionPassManager &PM = jitstate->getPM();
   M->setDataLayout(TM.getDataLayout());
   PM.add(new DataLayoutPass(M));
@@ -177,7 +177,7 @@ JIT::~JIT() {
 /// addModule - Add a new Module to the JIT.  If we previously removed the last
 /// Module, we need re-initialize jitstate with a valid Module.
 void JIT::addModule(Module *M) {
-  MutexGuard locked(lock);
+  std::lock_guard<std::recursive_mutex> locked(lock);
 
   if (Modules.empty()) {
     assert(!jitstate && "jitstate should be NULL if Modules vector is empty!");
@@ -206,7 +206,7 @@ void JIT::addModule(Module *M) {
 bool JIT::removeModule(Module *M) {
   bool result = ExecutionEngine::removeModule(M);
 
-  MutexGuard locked(lock);
+  std::lock_guard<std::recursive_mutex> locked(lock);
 
   if (jitstate && jitstate->getModule() == M) {
     delete jitstate;
@@ -408,13 +408,13 @@ GenericValue JIT::runFunction(Function *F,
 void JIT::RegisterJITEventListener(JITEventListener *L) {
   if (!L)
     return;
-  MutexGuard locked(lock);
+  std::lock_guard<std::recursive_mutex> locked(lock);
   EventListeners.push_back(L);
 }
 void JIT::UnregisterJITEventListener(JITEventListener *L) {
   if (!L)
     return;
-  MutexGuard locked(lock);
+  std::lock_guard<std::recursive_mutex> locked(lock);
   std::vector<JITEventListener*>::reverse_iterator I=
       std::find(EventListeners.rbegin(), EventListeners.rend(), L);
   if (I != EventListeners.rend()) {
@@ -426,14 +426,14 @@ void JIT::NotifyFunctionEmitted(
     const Function &F,
     void *Code, size_t Size,
     const JITEvent_EmittedFunctionDetails &Details) {
-  MutexGuard locked(lock);
+  std::lock_guard<std::recursive_mutex> locked(lock);
   for (unsigned I = 0, S = EventListeners.size(); I < S; ++I) {
     EventListeners[I]->NotifyFunctionEmitted(F, Code, Size, Details);
   }
 }
 
 void JIT::NotifyFreeingMachineCode(void *OldPtr) {
-  MutexGuard locked(lock);
+  std::lock_guard<std::recursive_mutex> locked(lock);
   for (unsigned I = 0, S = EventListeners.size(); I < S; ++I) {
     EventListeners[I]->NotifyFreeingMachineCode(OldPtr);
   }
@@ -444,7 +444,7 @@ void JIT::NotifyFreeingMachineCode(void *OldPtr) {
 /// GlobalAddress[F] with the address of F's machine code.
 ///
 void JIT::runJITOnFunction(Function *F, MachineCodeInfo *MCI) {
-  MutexGuard locked(lock);
+  std::lock_guard<std::recursive_mutex> locked(lock);
 
   class MCIListener : public JITEventListener {
     MachineCodeInfo *const MCI;
@@ -505,7 +505,7 @@ void *JIT::getPointerToFunction(Function *F) {
   if (void *Addr = getPointerToGlobalIfAvailable(F))
     return Addr;   // Check if function already code gen'd
 
-  MutexGuard locked(lock);
+  std::lock_guard<std::recursive_mutex> locked(lock);
 
   // Now that this thread owns the lock, make sure we read in the function if it
   // exists in this Module.
@@ -534,7 +534,7 @@ void *JIT::getPointerToFunction(Function *F) {
 }
 
 void JIT::addPointerToBasicBlock(const BasicBlock *BB, void *Addr) {
-  MutexGuard locked(lock);
+  std::lock_guard<std::recursive_mutex> locked(lock);
 
   BasicBlockAddressMapTy::iterator I =
     getBasicBlockAddressMap().find(BB);
@@ -546,7 +546,7 @@ void JIT::addPointerToBasicBlock(const BasicBlock *BB, void *Addr) {
 }
 
 void JIT::clearPointerToBasicBlock(const BasicBlock *BB) {
-  MutexGuard locked(lock);
+  std::lock_guard<std::recursive_mutex> locked(lock);
   getBasicBlockAddressMap().erase(BB);
 }
 
@@ -555,7 +555,7 @@ void *JIT::getPointerToBasicBlock(BasicBlock *BB) {
   (void)getPointerToFunction(BB->getParent());
 
   // resolve basic block address
-  MutexGuard locked(lock);
+  std::lock_guard<std::recursive_mutex> locked(lock);
 
   BasicBlockAddressMapTy::iterator I =
     getBasicBlockAddressMap().find(BB);
@@ -592,7 +592,7 @@ void *JIT::getPointerToNamedFunction(const std::string &Name,
 /// variable, possibly emitting it to memory if needed.  This is used by the
 /// Emitter.
 void *JIT::getOrEmitGlobalVariable(const GlobalVariable *GV) {
-  MutexGuard locked(lock);
+  std::lock_guard<std::recursive_mutex> locked(lock);
 
   void *Ptr = getPointerToGlobalIfAvailable(GV);
   if (Ptr) return Ptr;
@@ -666,7 +666,7 @@ char* JIT::getMemoryForGV(const GlobalVariable* GV) {
   size_t S = getDataLayout()->getTypeAllocSize(GlobalType);
   size_t A = getDataLayout()->getPreferredAlignment(GV);
   if (GV->isThreadLocal()) {
-    MutexGuard locked(lock);
+    std::lock_guard<std::recursive_mutex> locked(lock);
     Ptr = TJI.allocateThreadLocalMemory(S);
   } else if (TJI.allocateSeparateGVMemory()) {
     if (A <= 8) {
@@ -687,7 +687,7 @@ char* JIT::getMemoryForGV(const GlobalVariable* GV) {
 }
 
 void JIT::addPendingFunction(Function *F) {
-  MutexGuard locked(lock);
+  std::lock_guard<std::recursive_mutex> locked(lock);
   jitstate->getPendingFunctions().push_back(F);
 }
 

lib/ExecutionEngine/JIT/JITEmitter.cpp

@@ -40,7 +40,6 @@
 #include "llvm/Support/ErrorHandling.h"
 #include "llvm/Support/ManagedStatic.h"
 #include "llvm/Support/Memory.h"
-#include "llvm/Support/MutexGuard.h"
 #include "llvm/Support/raw_ostream.h"
 #include "llvm/Target/TargetInstrInfo.h"
 #include "llvm/Target/TargetJITInfo.h"
@@ -50,6 +49,7 @@
 #ifndef NDEBUG
 #include <iomanip>
 #endif
+#include <mutex>
 using namespace llvm;
 
 #define DEBUG_TYPE "jit"
@@ -230,22 +230,22 @@ namespace {
     std::map<void*, JITResolver*> Map;
 
     /// Guards Map from concurrent accesses.
-    mutable sys::Mutex Lock;
+    mutable std::recursive_mutex Lock;
 
   public:
     /// Registers a Stub to be resolved by Resolver.
     void RegisterStubResolver(void *Stub, JITResolver *Resolver) {
-      MutexGuard guard(Lock);
+      std::lock_guard<std::recursive_mutex> guard(Lock);
       Map.insert(std::make_pair(Stub, Resolver));
     }
     /// Unregisters the Stub when it's invalidated.
     void UnregisterStubResolver(void *Stub) {
-      MutexGuard guard(Lock);
+      std::lock_guard<std::recursive_mutex> guard(Lock);
       Map.erase(Stub);
     }
     /// Returns the JITResolver instance that owns the Stub.
     JITResolver *getResolverFromStub(void *Stub) const {
-      MutexGuard guard(Lock);
+      std::lock_guard<std::recursive_mutex> guard(Lock);
       // The address given to us for the stub may not be exactly right, it might
       // be a little bit after the stub.  As such, use upper_bound to find it.
       // This is the same trick as in LookupFunctionFromCallSite from
@@ -258,7 +258,7 @@ namespace {
     /// True if any stubs refer to the given resolver. Only used in an assert().
     /// O(N)
     bool ResolverHasStubs(JITResolver* Resolver) const {
-      MutexGuard guard(Lock);
+      std::lock_guard<std::recursive_mutex> guard(Lock);
       for (std::map<void*, JITResolver*>::const_iterator I = Map.begin(),
              E = Map.end(); I != E; ++I) {
         if (I->second == Resolver)
@@ -494,7 +494,7 @@ JITResolver::~JITResolver() {
 /// getLazyFunctionStubIfAvailable - This returns a pointer to a function stub
 /// if it has already been created.
 void *JITResolver::getLazyFunctionStubIfAvailable(Function *F) {
-  MutexGuard locked(TheJIT->lock);
+  std::lock_guard<std::recursive_mutex> guard(TheJIT->lock);
 
   // If we already have a stub for this function, recycle it.
   return state.getFunctionToLazyStubMap().lookup(F);
@@ -503,7 +503,7 @@ void *JITResolver::getLazyFunctionStubIfAvailable(Function *F) {
 /// getFunctionStub - This returns a pointer to a function stub, creating
 /// one on demand as needed.
 void *JITResolver::getLazyFunctionStub(Function *F) {
-  MutexGuard locked(TheJIT->lock);
+  std::lock_guard<std::recursive_mutex> guard(TheJIT->lock);
 
   // If we already have a lazy stub for this function, recycle it.
   void *&Stub = state.getFunctionToLazyStubMap()[F];
@@ -564,7 +564,7 @@ void *JITResolver::getLazyFunctionStub(Function *F) {
 /// getGlobalValueIndirectSym - Return a lazy pointer containing the specified
 /// GV address.
 void *JITResolver::getGlobalValueIndirectSym(GlobalValue *GV, void *GVAddress) {
-  MutexGuard locked(TheJIT->lock);
+  std::lock_guard<std::recursive_mutex> guard(TheJIT->lock);
 
   // If we already have a stub for this global variable, recycle it.
   void *&IndirectSym = state.getGlobalToIndirectSymMap()[GV];
@@ -622,7 +622,7 @@ void *JITResolver::JITCompilerFn(void *Stub) {
     // Only lock for getting the Function. The call getPointerToFunction made
     // in this function might trigger function materializing, which requires
     // JIT lock to be unlocked.
-    MutexGuard locked(JR->TheJIT->lock);
+    std::lock_guard<std::recursive_mutex> guard(JR->TheJIT->lock);
 
     // The address given to us for the stub may not be exactly right, it might
     // be a little bit after the stub.  As such, use upper_bound to find it.
@@ -654,7 +654,7 @@ void *JITResolver::JITCompilerFn(void *Stub) {
   }
 
   // Reacquire the lock to update the GOT map.
-  MutexGuard locked(JR->TheJIT->lock);
+  std::lock_guard<std::recursive_mutex> locked(JR->TheJIT->lock);
 
   // We might like to remove the call site from the CallSiteToFunction map, but
   // we can't do that! Multiple threads could be stuck, waiting to acquire the

lib/ExecutionEngine/MCJIT/MCJIT.cpp

@@ -26,7 +26,6 @@
 #include "llvm/Support/DynamicLibrary.h"
 #include "llvm/Support/ErrorHandling.h"
 #include "llvm/Support/MemoryBuffer.h"
-#include "llvm/Support/MutexGuard.h"
 #include "llvm/Target/TargetLowering.h"
 
 using namespace llvm;
@@ -66,7 +65,7 @@ MCJIT::MCJIT(Module *m, TargetMachine *tm, RTDyldMemoryManager *MM,
 }
 
 MCJIT::~MCJIT() {
-  MutexGuard locked(lock);
+  std::lock_guard<std::recursive_mutex> locked(lock);
   // FIXME: We are managing our modules, so we do not want the base class
   // ExecutionEngine to manage them as well. To avoid double destruction
   // of the first (and only) module added in ExecutionEngine constructor
@@ -102,12 +101,12 @@ MCJIT::~MCJIT() {
 }
 
 void MCJIT::addModule(Module *M) {
-  MutexGuard locked(lock);
+  std::lock_guard<std::recursive_mutex> locked(lock);
   OwnedModules.addModule(M);
 }
 
 bool MCJIT::removeModule(Module *M) {
-  MutexGuard locked(lock);
+  std::lock_guard<std::recursive_mutex> locked(lock);
   return OwnedModules.removeModule(M);
 }
 
@@ -129,12 +128,12 @@ void MCJIT::addArchive(object::Archive *A) {
 
 
 void MCJIT::setObjectCache(ObjectCache* NewCache) {
-  MutexGuard locked(lock);
+  std::lock_guard<std::recursive_mutex> locked(lock);
   ObjCache = NewCache;
 }
 
 ObjectBufferStream* MCJIT::emitObject(Module *M) {
-  MutexGuard locked(lock);
+  std::lock_guard<std::recursive_mutex> locked(lock);
 
   // This must be a module which has already been added but not loaded to this
   // MCJIT instance, since these conditions are tested by our caller,
@@ -174,7 +173,7 @@ ObjectBufferStream* MCJIT::emitObject(Module *M) {
 
 void MCJIT::generateCodeForModule(Module *M) {
   // Get a thread lock to make sure we aren't trying to load multiple times
-  MutexGuard locked(lock);
+  std::lock_guard<std::recursive_mutex> locked(lock);
 
   // This must be a module which has already been added to this MCJIT instance.
   assert(OwnedModules.ownsModule(M) &&
@@ -214,7 +213,7 @@ void MCJIT::generateCodeForModule(Module *M) {
 }
 
 void MCJIT::finalizeLoadedModules() {
-  MutexGuard locked(lock);
+  std::lock_guard<std::recursive_mutex> locked(lock);
 
   // Resolve any outstanding relocations.
   Dyld.resolveRelocations();
@@ -230,7 +229,7 @@ void MCJIT::finalizeLoadedModules() {
 
 // FIXME: Rename this.
 void MCJIT::finalizeObject() {
-  MutexGuard locked(lock);
+  std::lock_guard<std::recursive_mutex> locked(lock);
 
   for (ModulePtrSet::iterator I = OwnedModules.begin_added(),
                               E = OwnedModules.end_added();
@@ -243,7 +242,7 @@ void MCJIT::finalizeObject() {
 }
 
 void MCJIT::finalizeModule(Module *M) {
-  MutexGuard locked(lock);
+  std::lock_guard<std::recursive_mutex> locked(lock);
 
   // This must be a module which has already been added to this MCJIT instance.
   assert(OwnedModules.ownsModule(M) && "MCJIT::finalizeModule: Unknown module.");
@@ -268,7 +267,7 @@ uint64_t MCJIT::getExistingSymbolAddress(const std::string &Name) {
 
 Module *MCJIT::findModuleForSymbol(const std::string &Name,
                                    bool CheckFunctionsOnly) {
-  MutexGuard locked(lock);
+  std::lock_guard<std::recursive_mutex> locked(lock);
 
   // If it hasn't already been generated, see if it's in one of our modules.
   for (ModulePtrSet::iterator I = OwnedModules.begin_added(),
@@ -292,7 +291,7 @@ Module *MCJIT::findModuleForSymbol(const std::string &Name,
 uint64_t MCJIT::getSymbolAddress(const std::string &Name,
                                  bool CheckFunctionsOnly)
 {
-  MutexGuard locked(lock);
+  std::lock_guard<std::recursive_mutex> locked(lock);
 
   // First, check to see if we already have this symbol.
   uint64_t Addr = getExistingSymbolAddress(Name);
@@ -336,7 +335,7 @@ uint64_t MCJIT::getSymbolAddress(const std::string &Name,
 }
 
 uint64_t MCJIT::getGlobalValueAddress(const std::string &Name) {
-  MutexGuard locked(lock);
+  std::lock_guard<std::recursive_mutex> locked(lock);
   uint64_t Result = getSymbolAddress(Name, false);
   if (Result != 0)
     finalizeLoadedModules();
@@ -344,7 +343,7 @@ uint64_t MCJIT::getGlobalValueAddress(const std::string &Name) {
 }
 
 uint64_t MCJIT::getFunctionAddress(const std::string &Name) {
-  MutexGuard locked(lock);
+  std::lock_guard<std::recursive_mutex> locked(lock);
   uint64_t Result = getSymbolAddress(Name, true);
   if (Result != 0)
     finalizeLoadedModules();
@@ -353,7 +352,7 @@ uint64_t MCJIT::getFunctionAddress(const std::string &Name) {
 
 // Deprecated.  Use getFunctionAddress instead.
 void *MCJIT::getPointerToFunction(Function *F) {
-  MutexGuard locked(lock);
+  std::lock_guard<std::recursive_mutex> locked(lock);
 
   if (F->isDeclaration() || F->hasAvailableExternallyLinkage()) {
     bool AbortOnFailure = !F->hasExternalWeakLinkage();
@@ -552,13 +551,13 @@ void *MCJIT::getPointerToNamedFunction(const std::string &Name,
 void MCJIT::RegisterJITEventListener(JITEventListener *L) {
   if (!L)
     return;
-  MutexGuard locked(lock);
+  std::lock_guard<std::recursive_mutex> locked(lock);
   EventListeners.push_back(L);
 }
 void MCJIT::UnregisterJITEventListener(JITEventListener *L) {
   if (!L)
     return;
-  MutexGuard locked(lock);
+  std::lock_guard<std::recursive_mutex> locked(lock);
   SmallVector<JITEventListener*, 2>::reverse_iterator I=
       std::find(EventListeners.rbegin(), EventListeners.rend(), L);
   if (I != EventListeners.rend()) {
@@ -567,14 +566,14 @@ void MCJIT::UnregisterJITEventListener(JITEventListener *L) {
   }
 }
 void MCJIT::NotifyObjectEmitted(const ObjectImage& Obj) {
-  MutexGuard locked(lock);
+  std::lock_guard<std::recursive_mutex> locked(lock);
   MemMgr.notifyObjectLoaded(this, &Obj);
   for (unsigned I = 0, S = EventListeners.size(); I < S; ++I) {
     EventListeners[I]->NotifyObjectEmitted(Obj);
   }
 }
 void MCJIT::NotifyFreeingObject(const ObjectImage& Obj) {
-  MutexGuard locked(lock);
+  std::lock_guard<std::recursive_mutex> locked(lock);
   for (unsigned I = 0, S = EventListeners.size(); I < S; ++I) {
     EventListeners[I]->NotifyFreeingObject(Obj);
   }

unittests/IR/ValueMapTest.cpp

@@ -186,19 +186,19 @@ struct LockMutex : ValueMapConfig<KeyT, MutexT> {
   };
   static void onRAUW(const ExtraData &Data, KeyT Old, KeyT New) {
     *Data.CalledRAUW = true;
-    EXPECT_FALSE(Data.M->tryacquire()) << "Mutex should already be locked.";
+    EXPECT_FALSE(Data.M->try_lock()) << "Mutex should already be locked.";
   }
   static void onDelete(const ExtraData &Data, KeyT Old) {
     *Data.CalledDeleted = true;
-    EXPECT_FALSE(Data.M->tryacquire()) << "Mutex should already be locked.";
+    EXPECT_FALSE(Data.M->try_lock()) << "Mutex should already be locked.";
   }
   static MutexT *getMutex(const ExtraData &Data) { return Data.M; }
 };
 #if LLVM_ENABLE_THREADS
 TYPED_TEST(ValueMapTest, LocksMutex) {
-  sys::Mutex M(false);  // Not recursive.
+  std::mutex M;  // Not recursive.
   bool CalledRAUW = false, CalledDeleted = false;
-  typedef LockMutex<TypeParam*, sys::Mutex> ConfigType;
+  typedef LockMutex<TypeParam*, std::mutex> ConfigType;
   typename ConfigType::ExtraData Data = {&M, &CalledRAUW, &CalledDeleted};
   ValueMap<TypeParam*, int, ConfigType> VM(Data);
   VM[this->BitcastV.get()] = 7;