Make ExecutionEngine owning a DataLayout

Summary:
This change is part of a series of commits dedicated to have a single
DataLayout during compilation by using always the one owned by the
module.

The ExecutionEngine will act as an exception and will be unsafe to
be reused across context. We don't enforce this rule but undefined
behavior can occurs if the user tries to do it.

Reviewers: lhames

Subscribers: echristo, llvm-commits, rafael, yaron.keren

Differential Revision: http://reviews.llvm.org/D11110

From: Mehdi Amini <mehdi.amini@apple.com>

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@242414 91177308-0d34-0410-b5e6-96231b3b80d8

diff --git a/include/llvm/ExecutionEngine/ExecutionEngine.h b/include/llvm/ExecutionEngine/ExecutionEngine.h
index 821c0181ce83da300d58a4adf02ced24fd11c44d..87f5c6a20807588c8083648618b75e37e0ee9a4b 100644 (file)
--- a/include/llvm/ExecutionEngine/ExecutionEngine.h
+++ b/include/llvm/ExecutionEngine/ExecutionEngine.h
@@ -104,7 +104,12 @@ class ExecutionEngine {
   ExecutionEngineState EEState;
 
   /// The target data for the platform for which execution is being performed.
-  const DataLayout *DL;
+  ///
+  /// Note: the DataLayout is LLVMContext specific because it has an
+  /// internal cache based on type pointers. It makes unsafe to reuse the
+  /// ExecutionEngine across context, we don't enforce this rule but undefined
+  /// behavior can occurs if the user tries to do it.
+  const DataLayout DL;
 
   /// Whether lazy JIT compilation is enabled.
   bool CompilingLazily;
@@ -126,8 +131,6 @@ protected:
   /// optimize for the case where there is only one module.
   SmallVector<std::unique_ptr<Module>, 1> Modules;
 
-  void setDataLayout(const DataLayout *Val) { DL = Val; }
-
   /// getMemoryforGV - Allocate memory for a global variable.
   virtual char *getMemoryForGV(const GlobalVariable *GV);
 
@@ -194,7 +197,7 @@ public:
 
   //===--------------------------------------------------------------------===//
 
-  const DataLayout *getDataLayout() const { return DL; }
+  const DataLayout &getDataLayout() const { return DL; }
 
   /// removeModule - Remove a Module from the list of modules.  Returns true if
   /// M is found.
@@ -478,7 +481,8 @@ public:
   }
 
 protected:
-  ExecutionEngine() {}
+  ExecutionEngine(const DataLayout DL) : DL(std::move(DL)){};
+  explicit ExecutionEngine(DataLayout DL, std::unique_ptr<Module> M);
   explicit ExecutionEngine(std::unique_ptr<Module> M);
 
   void emitGlobals();
@@ -488,6 +492,9 @@ protected:
   GenericValue getConstantValue(const Constant *C);
   void LoadValueFromMemory(GenericValue &Result, GenericValue *Ptr,
                            Type *Ty);
+
+private:
+  void Init(std::unique_ptr<Module> M);
 };
 
 namespace EngineKind {

diff --git a/lib/ExecutionEngine/ExecutionEngine.cpp b/lib/ExecutionEngine/ExecutionEngine.cpp
index c2ff8e27af47a4ac65a14d4c206fa63b506089fd..67b843737cd2b6abadd969d48f270ccb96b26c8f 100644 (file)
--- a/lib/ExecutionEngine/ExecutionEngine.cpp
+++ b/lib/ExecutionEngine/ExecutionEngine.cpp
@@ -61,8 +61,7 @@ ExecutionEngine *(*ExecutionEngine::InterpCtor)(std::unique_ptr<Module> M,
 
 void JITEventListener::anchor() {}
 
-ExecutionEngine::ExecutionEngine(std::unique_ptr<Module> M)
-  : LazyFunctionCreator(nullptr) {
+void ExecutionEngine::Init(std::unique_ptr<Module> M) {
   CompilingLazily         = false;
   GVCompilationDisabled   = false;
   SymbolSearchingDisabled = false;
@@ -79,6 +78,16 @@ ExecutionEngine::ExecutionEngine(std::unique_ptr<Module> M)
   Modules.push_back(std::move(M));
 }
 
+ExecutionEngine::ExecutionEngine(std::unique_ptr<Module> M)
+    : DL(M->getDataLayout()), LazyFunctionCreator(nullptr) {
+  Init(std::move(M));
+}
+
+ExecutionEngine::ExecutionEngine(DataLayout DL, std::unique_ptr<Module> M)
+    : DL(std::move(DL)), LazyFunctionCreator(nullptr) {
+  Init(std::move(M));
+}
+
 ExecutionEngine::~ExecutionEngine() {
   clearAllGlobalMappings();
 }
@@ -115,7 +124,7 @@ public:
 }  // anonymous namespace
 
 char *ExecutionEngine::getMemoryForGV(const GlobalVariable *GV) {
-  return GVMemoryBlock::Create(GV, *getDataLayout());
+  return GVMemoryBlock::Create(GV, getDataLayout());
 }
 
 void ExecutionEngine::addObjectFile(std::unique_ptr<object::ObjectFile> O) {
@@ -326,7 +335,7 @@ void *ArgvArray::reset(LLVMContext &C, ExecutionEngine *EE,
                        const std::vector<std::string> &InputArgv) {
   Values.clear();  // Free the old contents.
   Values.reserve(InputArgv.size());
-  unsigned PtrSize = EE->getDataLayout()->getPointerSize();
+  unsigned PtrSize = EE->getDataLayout().getPointerSize();
   Array = make_unique<char[]>((InputArgv.size()+1)*PtrSize);
 
   DEBUG(dbgs() << "JIT: ARGV = " << (void*)Array.get() << "\n");
@@ -401,7 +410,7 @@ void ExecutionEngine::runStaticConstructorsDestructors(bool isDtors) {
 #ifndef NDEBUG
 /// isTargetNullPtr - Return whether the target pointer stored at Loc is null.
 static bool isTargetNullPtr(ExecutionEngine *EE, void *Loc) {
-  unsigned PtrSize = EE->getDataLayout()->getPointerSize();
+  unsigned PtrSize = EE->getDataLayout().getPointerSize();
   for (unsigned i = 0; i < PtrSize; ++i)
     if (*(i + (uint8_t*)Loc))
       return false;
@@ -634,8 +643,8 @@ GenericValue ExecutionEngine::getConstantValue(const Constant *C) {
     case Instruction::GetElementPtr: {
       // Compute the index
       GenericValue Result = getConstantValue(Op0);
-      APInt Offset(DL->getPointerSizeInBits(), 0);
-      cast<GEPOperator>(CE)->accumulateConstantOffset(*DL, Offset);
+      APInt Offset(DL.getPointerSizeInBits(), 0);
+      cast<GEPOperator>(CE)->accumulateConstantOffset(DL, Offset);
 
       char* tmp = (char*) Result.PointerVal;
       Result = PTOGV(tmp + Offset.getSExtValue());
@@ -722,16 +731,16 @@ GenericValue ExecutionEngine::getConstantValue(const Constant *C) {
     }
     case Instruction::PtrToInt: {
       GenericValue GV = getConstantValue(Op0);
-      uint32_t PtrWidth = DL->getTypeSizeInBits(Op0->getType());
+      uint32_t PtrWidth = DL.getTypeSizeInBits(Op0->getType());
       assert(PtrWidth <= 64 && "Bad pointer width");
       GV.IntVal = APInt(PtrWidth, uintptr_t(GV.PointerVal));
-      uint32_t IntWidth = DL->getTypeSizeInBits(CE->getType());
+      uint32_t IntWidth = DL.getTypeSizeInBits(CE->getType());
       GV.IntVal = GV.IntVal.zextOrTrunc(IntWidth);
       return GV;
     }
     case Instruction::IntToPtr: {
       GenericValue GV = getConstantValue(Op0);
-      uint32_t PtrWidth = DL->getTypeSizeInBits(CE->getType());
+      uint32_t PtrWidth = DL.getTypeSizeInBits(CE->getType());
       GV.IntVal = GV.IntVal.zextOrTrunc(PtrWidth);
       assert(GV.IntVal.getBitWidth() <= 64 && "Bad pointer width");
       GV.PointerVal = PointerTy(uintptr_t(GV.IntVal.getZExtValue()));
@@ -1033,7 +1042,7 @@ static void StoreIntToMemory(const APInt &IntVal, uint8_t *Dst,
 
 void ExecutionEngine::StoreValueToMemory(const GenericValue &Val,
                                          GenericValue *Ptr, Type *Ty) {
-  const unsigned StoreBytes = getDataLayout()->getTypeStoreSize(Ty);
+  const unsigned StoreBytes = getDataLayout().getTypeStoreSize(Ty);
 
   switch (Ty->getTypeID()) {
   default:
@@ -1073,7 +1082,7 @@ void ExecutionEngine::StoreValueToMemory(const GenericValue &Val,
     break;
   }
 
-  if (sys::IsLittleEndianHost != getDataLayout()->isLittleEndian())
+  if (sys::IsLittleEndianHost != getDataLayout().isLittleEndian())
     // Host and target are different endian - reverse the stored bytes.
     std::reverse((uint8_t*)Ptr, StoreBytes + (uint8_t*)Ptr);
 }
@@ -1110,7 +1119,7 @@ static void LoadIntFromMemory(APInt &IntVal, uint8_t *Src, unsigned LoadBytes) {
 void ExecutionEngine::LoadValueFromMemory(GenericValue &Result,
                                           GenericValue *Ptr,
                                           Type *Ty) {
-  const unsigned LoadBytes = getDataLayout()->getTypeStoreSize(Ty);
+  const unsigned LoadBytes = getDataLayout().getTypeStoreSize(Ty);
 
   switch (Ty->getTypeID()) {
   case Type::IntegerTyID:
@@ -1176,20 +1185,20 @@ void ExecutionEngine::InitializeMemory(const Constant *Init, void *Addr) {
   
   if (const ConstantVector *CP = dyn_cast<ConstantVector>(Init)) {
     unsigned ElementSize =
-      getDataLayout()->getTypeAllocSize(CP->getType()->getElementType());
+        getDataLayout().getTypeAllocSize(CP->getType()->getElementType());
     for (unsigned i = 0, e = CP->getNumOperands(); i != e; ++i)
       InitializeMemory(CP->getOperand(i), (char*)Addr+i*ElementSize);
     return;
   }
   
   if (isa<ConstantAggregateZero>(Init)) {
-    memset(Addr, 0, (size_t)getDataLayout()->getTypeAllocSize(Init->getType()));
+    memset(Addr, 0, (size_t)getDataLayout().getTypeAllocSize(Init->getType()));
     return;
   }
   
   if (const ConstantArray *CPA = dyn_cast<ConstantArray>(Init)) {
     unsigned ElementSize =
-      getDataLayout()->getTypeAllocSize(CPA->getType()->getElementType());
+        getDataLayout().getTypeAllocSize(CPA->getType()->getElementType());
     for (unsigned i = 0, e = CPA->getNumOperands(); i != e; ++i)
       InitializeMemory(CPA->getOperand(i), (char*)Addr+i*ElementSize);
     return;
@@ -1197,7 +1206,7 @@ void ExecutionEngine::InitializeMemory(const Constant *Init, void *Addr) {
   
   if (const ConstantStruct *CPS = dyn_cast<ConstantStruct>(Init)) {
     const StructLayout *SL =
-      getDataLayout()->getStructLayout(cast<StructType>(CPS->getType()));
+        getDataLayout().getStructLayout(cast<StructType>(CPS->getType()));
     for (unsigned i = 0, e = CPS->getNumOperands(); i != e; ++i)
       InitializeMemory(CPS->getOperand(i), (char*)Addr+SL->getElementOffset(i));
     return;
@@ -1342,7 +1351,7 @@ void ExecutionEngine::EmitGlobalVariable(const GlobalVariable *GV) {
     InitializeMemory(GV->getInitializer(), GA);
 
   Type *ElTy = GV->getType()->getElementType();
-  size_t GVSize = (size_t)getDataLayout()->getTypeAllocSize(ElTy);
+  size_t GVSize = (size_t)getDataLayout().getTypeAllocSize(ElTy);
   NumInitBytes += (unsigned)GVSize;
   ++NumGlobals;
 }

diff --git a/lib/ExecutionEngine/ExecutionEngineBindings.cpp b/lib/ExecutionEngine/ExecutionEngineBindings.cpp
index 55ab5af2b9098d32b4edc54451cba88b7dbac7fd..892c941a292ffdaa211f1359c41a1eee7180ddae 100644 (file)
--- a/lib/ExecutionEngine/ExecutionEngineBindings.cpp
+++ b/lib/ExecutionEngine/ExecutionEngineBindings.cpp
@@ -318,7 +318,7 @@ void *LLVMRecompileAndRelinkFunction(LLVMExecutionEngineRef EE,
 }
 
 LLVMTargetDataRef LLVMGetExecutionEngineTargetData(LLVMExecutionEngineRef EE) {
-  return wrap(unwrap(EE)->getDataLayout());
+  return wrap(&unwrap(EE)->getDataLayout());
 }
 
 LLVMTargetMachineRef

diff --git a/lib/ExecutionEngine/Interpreter/Execution.cpp b/lib/ExecutionEngine/Interpreter/Execution.cpp
index dbfa37e2b0da60213b73bd00b5a0028f68f9f378..53beed87a411b3244d8477a13a51b4bd4021c0ec 100644 (file)
--- a/lib/ExecutionEngine/Interpreter/Execution.cpp
+++ b/lib/ExecutionEngine/Interpreter/Execution.cpp
@@ -968,7 +968,7 @@ void Interpreter::visitAllocaInst(AllocaInst &I) {
   unsigned NumElements = 
     getOperandValue(I.getOperand(0), SF).IntVal.getZExtValue();
 
-  unsigned TypeSize = (size_t)TD.getTypeAllocSize(Ty);
+  unsigned TypeSize = (size_t)getDataLayout().getTypeAllocSize(Ty);
 
   // Avoid malloc-ing zero bytes, use max()...
   unsigned MemToAlloc = std::max(1U, NumElements * TypeSize);
@@ -1000,7 +1000,7 @@ GenericValue Interpreter::executeGEPOperation(Value *Ptr, gep_type_iterator I,
 
   for (; I != E; ++I) {
     if (StructType *STy = dyn_cast<StructType>(*I)) {
-      const StructLayout *SLO = TD.getStructLayout(STy);
+      const StructLayout *SLO = getDataLayout().getStructLayout(STy);
 
       const ConstantInt *CPU = cast<ConstantInt>(I.getOperand());
       unsigned Index = unsigned(CPU->getZExtValue());
@@ -1020,7 +1020,7 @@ GenericValue Interpreter::executeGEPOperation(Value *Ptr, gep_type_iterator I,
         assert(BitWidth == 64 && "Invalid index type for getelementptr");
         Idx = (int64_t)IdxGV.IntVal.getZExtValue();
       }
-      Total += TD.getTypeAllocSize(ST->getElementType())*Idx;
+      Total += getDataLayout().getTypeAllocSize(ST->getElementType()) * Idx;
     }
   }
 
@@ -1477,7 +1477,7 @@ GenericValue Interpreter::executeIntToPtrInst(Value *SrcVal, Type *DstTy,
   GenericValue Dest, Src = getOperandValue(SrcVal, SF);
   assert(DstTy->isPointerTy() && "Invalid PtrToInt instruction");
 
-  uint32_t PtrSize = TD.getPointerSizeInBits();
+  uint32_t PtrSize = getDataLayout().getPointerSizeInBits();
   if (PtrSize != Src.IntVal.getBitWidth())
     Src.IntVal = Src.IntVal.zextOrTrunc(PtrSize);
 
@@ -1497,7 +1497,7 @@ GenericValue Interpreter::executeBitCastInst(Value *SrcVal, Type *DstTy,
       (DstTy->getTypeID() == Type::VectorTyID)) {
     // vector src bitcast to vector dst or vector src bitcast to scalar dst or
     // scalar src bitcast to vector dst
-    bool isLittleEndian = TD.isLittleEndian();
+    bool isLittleEndian = getDataLayout().isLittleEndian();
     GenericValue TempDst, TempSrc, SrcVec;
     const Type *SrcElemTy;
     const Type *DstElemTy;

diff --git a/lib/ExecutionEngine/Interpreter/ExternalFunctions.cpp b/lib/ExecutionEngine/Interpreter/ExternalFunctions.cpp
index 9b44042d6144f36986edaee7a27ac74004d991ce..5411182f291d330c3da741319972f45f51d37d27 100644 (file)
--- a/lib/ExecutionEngine/Interpreter/ExternalFunctions.cpp
+++ b/lib/ExecutionEngine/Interpreter/ExternalFunctions.cpp
@@ -178,7 +178,7 @@ static void *ffiValueFor(Type *Ty, const GenericValue &AV,
 }
 
 static bool ffiInvoke(RawFunc Fn, Function *F, ArrayRef<GenericValue> ArgVals,
-                      const DataLayout *TD, GenericValue &Result) {
+                      const DataLayout &TD, GenericValue &Result) {
   ffi_cif cif;
   FunctionType *FTy = F->getFunctionType();
   const unsigned NumArgs = F->arg_size();
@@ -368,7 +368,7 @@ static GenericValue lle_X_sprintf(FunctionType *FT,
       case 'x': case 'X':
         if (HowLong >= 1) {
           if (HowLong == 1 &&
-              TheInterpreter->getDataLayout()->getPointerSizeInBits() == 64 &&
+              TheInterpreter->getDataLayout().getPointerSizeInBits() == 64 &&
               sizeof(long) < sizeof(int64_t)) {
             // Make sure we use %lld with a 64 bit argument because we might be
             // compiling LLI on a 32 bit compiler.

diff --git a/lib/ExecutionEngine/Interpreter/Interpreter.cpp b/lib/ExecutionEngine/Interpreter/Interpreter.cpp
index f103c09659aa408335c29e9955c3ba06d7b2fa1d..8cb9d45bb6806759390f0015fd6ee9d340508503 100644 (file)
--- a/lib/ExecutionEngine/Interpreter/Interpreter.cpp
+++ b/lib/ExecutionEngine/Interpreter/Interpreter.cpp
@@ -49,16 +49,15 @@ ExecutionEngine *Interpreter::create(std::unique_ptr<Module> M,
 // Interpreter ctor - Initialize stuff
 //
 Interpreter::Interpreter(std::unique_ptr<Module> M)
-  : ExecutionEngine(std::move(M)), TD(Modules.back().get()) {
+    : ExecutionEngine(std::move(M)) {
 
   memset(&ExitValue.Untyped, 0, sizeof(ExitValue.Untyped));
-  setDataLayout(&TD);
   // Initialize the "backend"
   initializeExecutionEngine();
   initializeExternalFunctions();
   emitGlobals();
 
-  IL = new IntrinsicLowering(TD);
+  IL = new IntrinsicLowering(getDataLayout());
 }
 
 Interpreter::~Interpreter() {

diff --git a/lib/ExecutionEngine/Interpreter/Interpreter.h b/lib/ExecutionEngine/Interpreter/Interpreter.h
index f97664181a871a30a91977dd5324803b149e6cdb..bd813ac4900703423424272cf8814f123ad864c1 100644 (file)
--- a/lib/ExecutionEngine/Interpreter/Interpreter.h
+++ b/lib/ExecutionEngine/Interpreter/Interpreter.h
@@ -95,7 +95,6 @@ struct ExecutionContext {
 //
 class Interpreter : public ExecutionEngine, public InstVisitor<Interpreter> {
   GenericValue ExitValue;          // The return value of the called function
-  DataLayout TD;
   IntrinsicLowering *IL;
 
   // The runtime stack of executing code.  The top of the stack is the current

diff --git a/lib/ExecutionEngine/MCJIT/MCJIT.cpp b/lib/ExecutionEngine/MCJIT/MCJIT.cpp
index a7d67050c7a68d35dc02c0b4193ed9818f0113a9..5f4641515ce5641eec064edd86f5b62b971108e9 100644 (file)
--- a/lib/ExecutionEngine/MCJIT/MCJIT.cpp
+++ b/lib/ExecutionEngine/MCJIT/MCJIT.cpp
@@ -65,12 +65,13 @@ MCJIT::createJIT(std::unique_ptr<Module> M,
                    std::move(Resolver));
 }
 
-MCJIT::MCJIT(std::unique_ptr<Module> M, std::unique_ptr<TargetMachine> tm,
+MCJIT::MCJIT(std::unique_ptr<Module> M, std::unique_ptr<TargetMachine> TM,
              std::shared_ptr<MCJITMemoryManager> MemMgr,
              std::shared_ptr<RuntimeDyld::SymbolResolver> Resolver)
-    : ExecutionEngine(std::move(M)), TM(std::move(tm)), Ctx(nullptr),
-      MemMgr(std::move(MemMgr)), Resolver(*this, std::move(Resolver)),
-      Dyld(*this->MemMgr, this->Resolver), ObjCache(nullptr) {
+    : ExecutionEngine(*TM->getDataLayout(), std::move(M)), TM(std::move(TM)),
+      Ctx(nullptr), MemMgr(std::move(MemMgr)),
+      Resolver(*this, std::move(Resolver)), Dyld(*this->MemMgr, this->Resolver),
+      ObjCache(nullptr) {
   // 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
@@ -85,7 +86,6 @@ MCJIT::MCJIT(std::unique_ptr<Module> M, std::unique_ptr<TargetMachine> tm,
   Modules.clear();
 
   OwnedModules.addModule(std::move(First));
-  setDataLayout(TM->getDataLayout());
   RegisterJITEventListener(JITEventListener::createGDBRegistrationListener());
 }
 
@@ -193,7 +193,11 @@ void MCJIT::generateCodeForModule(Module *M) {
   if (ObjCache)
     ObjectToLoad = ObjCache->getObject(M);
 
-  M->setDataLayout(*TM->getDataLayout());
+  if (M->getDataLayout().isDefault()) {
+    M->setDataLayout(getDataLayout());
+  } else {
+    assert(M->getDataLayout() == getDataLayout() && "DataLayout Mismatch");
+  }
 
   // If the cache did not contain a suitable object, compile the object
   if (!ObjectToLoad) {
@@ -265,7 +269,7 @@ void MCJIT::finalizeModule(Module *M) {
 
 RuntimeDyld::SymbolInfo MCJIT::findExistingSymbol(const std::string &Name) {
   SmallString<128> FullName;
-  Mangler::getNameWithPrefix(FullName, Name, *TM->getDataLayout());
+  Mangler::getNameWithPrefix(FullName, Name, getDataLayout());
   return Dyld.getSymbol(FullName);
 }
 

diff --git a/lib/ExecutionEngine/Orc/OrcMCJITReplacement.h b/lib/ExecutionEngine/Orc/OrcMCJITReplacement.h
index 7dc5164c419a5515223debf020e4503d08f315ab..a097fdfe950845ac0a5c7084443ad27b41960ecf 100644 (file)
--- a/lib/ExecutionEngine/Orc/OrcMCJITReplacement.h
+++ b/lib/ExecutionEngine/Orc/OrcMCJITReplacement.h
@@ -137,25 +137,26 @@ public:
   }
 
   OrcMCJITReplacement(
-                    std::shared_ptr<MCJITMemoryManager> MemMgr,
-                    std::shared_ptr<RuntimeDyld::SymbolResolver> ClientResolver,
-                    std::unique_ptr<TargetMachine> TM)
-      : TM(std::move(TM)), MemMgr(*this, std::move(MemMgr)),
-        Resolver(*this), ClientResolver(std::move(ClientResolver)),
-        NotifyObjectLoaded(*this), NotifyFinalized(*this),
+      std::shared_ptr<MCJITMemoryManager> MemMgr,
+      std::shared_ptr<RuntimeDyld::SymbolResolver> ClientResolver,
+      std::unique_ptr<TargetMachine> TM)
+      : ExecutionEngine(*TM->getDataLayout()), TM(std::move(TM)),
+        MemMgr(*this, std::move(MemMgr)), Resolver(*this),
+        ClientResolver(std::move(ClientResolver)), NotifyObjectLoaded(*this),
+        NotifyFinalized(*this),
         ObjectLayer(NotifyObjectLoaded, NotifyFinalized),
         CompileLayer(ObjectLayer, SimpleCompiler(*this->TM)),
-        LazyEmitLayer(CompileLayer) {
-    setDataLayout(this->TM->getDataLayout());
-  }
+        LazyEmitLayer(CompileLayer) {}
 
   void addModule(std::unique_ptr<Module> M) override {
 
     // If this module doesn't have a DataLayout attached then attach the
     // default.
-    if (M->getDataLayout().isDefault())
-      M->setDataLayout(*getDataLayout());
-
+    if (M->getDataLayout().isDefault()) {
+      M->setDataLayout(getDataLayout());
+    } else {
+      assert(M->getDataLayout() == getDataLayout() && "DataLayout Mismatch");
+    }
     Modules.push_back(std::move(M));
     std::vector<Module *> Ms;
     Ms.push_back(&*Modules.back());
@@ -310,7 +311,7 @@ private:
     std::string MangledName;
     {
       raw_string_ostream MangledNameStream(MangledName);
-      Mang.getNameWithPrefix(MangledNameStream, Name, *TM->getDataLayout());
+      Mang.getNameWithPrefix(MangledNameStream, Name, getDataLayout());
     }
     return MangledName;
   }