1 //===-- ExecutionEngine.cpp - Common Implementation shared by EEs ---------===//
3 // The LLVM Compiler Infrastructure
5 // This file is distributed under the University of Illinois Open Source
6 // License. See LICENSE.TXT for details.
8 //===----------------------------------------------------------------------===//
10 // This file defines the common interface used by the various execution engine
13 //===----------------------------------------------------------------------===//
15 #include "llvm/ExecutionEngine/ExecutionEngine.h"
16 #include "llvm/ADT/SmallString.h"
17 #include "llvm/ADT/Statistic.h"
18 #include "llvm/ExecutionEngine/GenericValue.h"
19 #include "llvm/ExecutionEngine/JITMemoryManager.h"
20 #include "llvm/ExecutionEngine/ObjectBuffer.h"
21 #include "llvm/ExecutionEngine/ObjectCache.h"
22 #include "llvm/IR/Constants.h"
23 #include "llvm/IR/DataLayout.h"
24 #include "llvm/IR/DerivedTypes.h"
25 #include "llvm/IR/Module.h"
26 #include "llvm/IR/Operator.h"
27 #include "llvm/IR/ValueHandle.h"
28 #include "llvm/Object/Archive.h"
29 #include "llvm/Object/ObjectFile.h"
30 #include "llvm/Support/Debug.h"
31 #include "llvm/Support/DynamicLibrary.h"
32 #include "llvm/Support/ErrorHandling.h"
33 #include "llvm/Support/Host.h"
34 #include "llvm/Support/MutexGuard.h"
35 #include "llvm/Support/TargetRegistry.h"
36 #include "llvm/Support/raw_ostream.h"
37 #include "llvm/Target/TargetMachine.h"
42 #define DEBUG_TYPE "jit"
44 STATISTIC(NumInitBytes, "Number of bytes of global vars initialized");
45 STATISTIC(NumGlobals , "Number of global vars initialized");
47 // Pin the vtable to this file.
48 void ObjectCache::anchor() {}
49 void ObjectBuffer::anchor() {}
50 void ObjectBufferStream::anchor() {}
52 ExecutionEngine *(*ExecutionEngine::MCJITCtor)(
53 std::unique_ptr<Module> M, std::string *ErrorStr,
54 RTDyldMemoryManager *MCJMM, std::unique_ptr<TargetMachine> TM) = nullptr;
55 ExecutionEngine *(*ExecutionEngine::InterpCtor)(std::unique_ptr<Module> M,
56 std::string *ErrorStr) =nullptr;
58 ExecutionEngine::ExecutionEngine(std::unique_ptr<Module> M)
60 LazyFunctionCreator(nullptr) {
61 CompilingLazily = false;
62 GVCompilationDisabled = false;
63 SymbolSearchingDisabled = false;
65 // IR module verification is enabled by default in debug builds, and disabled
66 // by default in release builds.
70 VerifyModules = false;
73 assert(M && "Module is null?");
74 Modules.push_back(std::move(M));
77 ExecutionEngine::~ExecutionEngine() {
78 clearAllGlobalMappings();
82 /// \brief Helper class which uses a value handler to automatically deletes the
83 /// memory block when the GlobalVariable is destroyed.
84 class GVMemoryBlock : public CallbackVH {
85 GVMemoryBlock(const GlobalVariable *GV)
86 : CallbackVH(const_cast<GlobalVariable*>(GV)) {}
89 /// \brief Returns the address the GlobalVariable should be written into. The
90 /// GVMemoryBlock object prefixes that.
91 static char *Create(const GlobalVariable *GV, const DataLayout& TD) {
92 Type *ElTy = GV->getType()->getElementType();
93 size_t GVSize = (size_t)TD.getTypeAllocSize(ElTy);
94 void *RawMemory = ::operator new(
95 DataLayout::RoundUpAlignment(sizeof(GVMemoryBlock),
96 TD.getPreferredAlignment(GV))
98 new(RawMemory) GVMemoryBlock(GV);
99 return static_cast<char*>(RawMemory) + sizeof(GVMemoryBlock);
102 void deleted() override {
103 // We allocated with operator new and with some extra memory hanging off the
104 // end, so don't just delete this. I'm not sure if this is actually
106 this->~GVMemoryBlock();
107 ::operator delete(this);
110 } // anonymous namespace
112 char *ExecutionEngine::getMemoryForGV(const GlobalVariable *GV) {
113 return GVMemoryBlock::Create(GV, *getDataLayout());
116 void ExecutionEngine::addObjectFile(std::unique_ptr<object::ObjectFile> O) {
117 llvm_unreachable("ExecutionEngine subclass doesn't implement addObjectFile.");
121 ExecutionEngine::addObjectFile(object::OwningBinary<object::ObjectFile> O) {
122 llvm_unreachable("ExecutionEngine subclass doesn't implement addObjectFile.");
125 void ExecutionEngine::addArchive(object::OwningBinary<object::Archive> A) {
126 llvm_unreachable("ExecutionEngine subclass doesn't implement addArchive.");
129 bool ExecutionEngine::removeModule(Module *M) {
130 for (auto I = Modules.begin(), E = Modules.end(); I != E; ++I) {
131 Module *Found = I->get();
135 clearGlobalMappingsFromModule(M);
142 Function *ExecutionEngine::FindFunctionNamed(const char *FnName) {
143 for (unsigned i = 0, e = Modules.size(); i != e; ++i) {
144 if (Function *F = Modules[i]->getFunction(FnName))
151 void *ExecutionEngineState::RemoveMapping(const GlobalValue *ToUnmap) {
152 GlobalAddressMapTy::iterator I = GlobalAddressMap.find(ToUnmap);
155 // FIXME: This is silly, we shouldn't end up with a mapping -> 0 in the
157 if (I == GlobalAddressMap.end())
161 GlobalAddressMap.erase(I);
164 GlobalAddressReverseMap.erase(OldVal);
168 void ExecutionEngine::addGlobalMapping(const GlobalValue *GV, void *Addr) {
169 MutexGuard locked(lock);
171 DEBUG(dbgs() << "JIT: Map \'" << GV->getName()
172 << "\' to [" << Addr << "]\n";);
173 void *&CurVal = EEState.getGlobalAddressMap()[GV];
174 assert((!CurVal || !Addr) && "GlobalMapping already established!");
177 // If we are using the reverse mapping, add it too.
178 if (!EEState.getGlobalAddressReverseMap().empty()) {
179 AssertingVH<const GlobalValue> &V =
180 EEState.getGlobalAddressReverseMap()[Addr];
181 assert((!V || !GV) && "GlobalMapping already established!");
186 void ExecutionEngine::clearAllGlobalMappings() {
187 MutexGuard locked(lock);
189 EEState.getGlobalAddressMap().clear();
190 EEState.getGlobalAddressReverseMap().clear();
193 void ExecutionEngine::clearGlobalMappingsFromModule(Module *M) {
194 MutexGuard locked(lock);
196 for (Module::iterator FI = M->begin(), FE = M->end(); FI != FE; ++FI)
197 EEState.RemoveMapping(FI);
198 for (Module::global_iterator GI = M->global_begin(), GE = M->global_end();
200 EEState.RemoveMapping(GI);
203 void *ExecutionEngine::updateGlobalMapping(const GlobalValue *GV, void *Addr) {
204 MutexGuard locked(lock);
206 ExecutionEngineState::GlobalAddressMapTy &Map =
207 EEState.getGlobalAddressMap();
209 // Deleting from the mapping?
211 return EEState.RemoveMapping(GV);
213 void *&CurVal = Map[GV];
214 void *OldVal = CurVal;
216 if (CurVal && !EEState.getGlobalAddressReverseMap().empty())
217 EEState.getGlobalAddressReverseMap().erase(CurVal);
220 // If we are using the reverse mapping, add it too.
221 if (!EEState.getGlobalAddressReverseMap().empty()) {
222 AssertingVH<const GlobalValue> &V =
223 EEState.getGlobalAddressReverseMap()[Addr];
224 assert((!V || !GV) && "GlobalMapping already established!");
230 void *ExecutionEngine::getPointerToGlobalIfAvailable(const GlobalValue *GV) {
231 MutexGuard locked(lock);
233 ExecutionEngineState::GlobalAddressMapTy::iterator I =
234 EEState.getGlobalAddressMap().find(GV);
235 return I != EEState.getGlobalAddressMap().end() ? I->second : nullptr;
238 const GlobalValue *ExecutionEngine::getGlobalValueAtAddress(void *Addr) {
239 MutexGuard locked(lock);
241 // If we haven't computed the reverse mapping yet, do so first.
242 if (EEState.getGlobalAddressReverseMap().empty()) {
243 for (ExecutionEngineState::GlobalAddressMapTy::iterator
244 I = EEState.getGlobalAddressMap().begin(),
245 E = EEState.getGlobalAddressMap().end(); I != E; ++I)
246 EEState.getGlobalAddressReverseMap().insert(std::make_pair(
247 I->second, I->first));
250 std::map<void *, AssertingVH<const GlobalValue> >::iterator I =
251 EEState.getGlobalAddressReverseMap().find(Addr);
252 return I != EEState.getGlobalAddressReverseMap().end() ? I->second : nullptr;
257 std::unique_ptr<char[]> Array;
258 std::vector<std::unique_ptr<char[]>> Values;
260 /// Turn a vector of strings into a nice argv style array of pointers to null
261 /// terminated strings.
262 void *reset(LLVMContext &C, ExecutionEngine *EE,
263 const std::vector<std::string> &InputArgv);
265 } // anonymous namespace
266 void *ArgvArray::reset(LLVMContext &C, ExecutionEngine *EE,
267 const std::vector<std::string> &InputArgv) {
268 Values.clear(); // Free the old contents.
269 Values.reserve(InputArgv.size());
270 unsigned PtrSize = EE->getDataLayout()->getPointerSize();
271 Array = make_unique<char[]>((InputArgv.size()+1)*PtrSize);
273 DEBUG(dbgs() << "JIT: ARGV = " << (void*)Array.get() << "\n");
274 Type *SBytePtr = Type::getInt8PtrTy(C);
276 for (unsigned i = 0; i != InputArgv.size(); ++i) {
277 unsigned Size = InputArgv[i].size()+1;
278 auto Dest = make_unique<char[]>(Size);
279 DEBUG(dbgs() << "JIT: ARGV[" << i << "] = " << (void*)Dest.get() << "\n");
281 std::copy(InputArgv[i].begin(), InputArgv[i].end(), Dest.get());
284 // Endian safe: Array[i] = (PointerTy)Dest;
285 EE->StoreValueToMemory(PTOGV(Dest.get()),
286 (GenericValue*)(&Array[i*PtrSize]), SBytePtr);
287 Values.push_back(std::move(Dest));
291 EE->StoreValueToMemory(PTOGV(nullptr),
292 (GenericValue*)(&Array[InputArgv.size()*PtrSize]),
297 void ExecutionEngine::runStaticConstructorsDestructors(Module &module,
299 const char *Name = isDtors ? "llvm.global_dtors" : "llvm.global_ctors";
300 GlobalVariable *GV = module.getNamedGlobal(Name);
302 // If this global has internal linkage, or if it has a use, then it must be
303 // an old-style (llvmgcc3) static ctor with __main linked in and in use. If
304 // this is the case, don't execute any of the global ctors, __main will do
306 if (!GV || GV->isDeclaration() || GV->hasLocalLinkage()) return;
308 // Should be an array of '{ i32, void ()* }' structs. The first value is
309 // the init priority, which we ignore.
310 ConstantArray *InitList = dyn_cast<ConstantArray>(GV->getInitializer());
313 for (unsigned i = 0, e = InitList->getNumOperands(); i != e; ++i) {
314 ConstantStruct *CS = dyn_cast<ConstantStruct>(InitList->getOperand(i));
317 Constant *FP = CS->getOperand(1);
318 if (FP->isNullValue())
319 continue; // Found a sentinal value, ignore.
321 // Strip off constant expression casts.
322 if (ConstantExpr *CE = dyn_cast<ConstantExpr>(FP))
324 FP = CE->getOperand(0);
326 // Execute the ctor/dtor function!
327 if (Function *F = dyn_cast<Function>(FP))
328 runFunction(F, std::vector<GenericValue>());
330 // FIXME: It is marginally lame that we just do nothing here if we see an
331 // entry we don't recognize. It might not be unreasonable for the verifier
332 // to not even allow this and just assert here.
336 void ExecutionEngine::runStaticConstructorsDestructors(bool isDtors) {
337 // Execute global ctors/dtors for each module in the program.
338 for (std::unique_ptr<Module> &M : Modules)
339 runStaticConstructorsDestructors(*M, isDtors);
343 /// isTargetNullPtr - Return whether the target pointer stored at Loc is null.
344 static bool isTargetNullPtr(ExecutionEngine *EE, void *Loc) {
345 unsigned PtrSize = EE->getDataLayout()->getPointerSize();
346 for (unsigned i = 0; i < PtrSize; ++i)
347 if (*(i + (uint8_t*)Loc))
353 int ExecutionEngine::runFunctionAsMain(Function *Fn,
354 const std::vector<std::string> &argv,
355 const char * const * envp) {
356 std::vector<GenericValue> GVArgs;
358 GVArgc.IntVal = APInt(32, argv.size());
361 unsigned NumArgs = Fn->getFunctionType()->getNumParams();
362 FunctionType *FTy = Fn->getFunctionType();
363 Type* PPInt8Ty = Type::getInt8PtrTy(Fn->getContext())->getPointerTo();
365 // Check the argument types.
367 report_fatal_error("Invalid number of arguments of main() supplied");
368 if (NumArgs >= 3 && FTy->getParamType(2) != PPInt8Ty)
369 report_fatal_error("Invalid type for third argument of main() supplied");
370 if (NumArgs >= 2 && FTy->getParamType(1) != PPInt8Ty)
371 report_fatal_error("Invalid type for second argument of main() supplied");
372 if (NumArgs >= 1 && !FTy->getParamType(0)->isIntegerTy(32))
373 report_fatal_error("Invalid type for first argument of main() supplied");
374 if (!FTy->getReturnType()->isIntegerTy() &&
375 !FTy->getReturnType()->isVoidTy())
376 report_fatal_error("Invalid return type of main() supplied");
381 GVArgs.push_back(GVArgc); // Arg #0 = argc.
384 GVArgs.push_back(PTOGV(CArgv.reset(Fn->getContext(), this, argv)));
385 assert(!isTargetNullPtr(this, GVTOP(GVArgs[1])) &&
386 "argv[0] was null after CreateArgv");
388 std::vector<std::string> EnvVars;
389 for (unsigned i = 0; envp[i]; ++i)
390 EnvVars.push_back(envp[i]);
392 GVArgs.push_back(PTOGV(CEnv.reset(Fn->getContext(), this, EnvVars)));
397 return runFunction(Fn, GVArgs).IntVal.getZExtValue();
400 void EngineBuilder::InitEngine() {
401 WhichEngine = EngineKind::Either;
403 OptLevel = CodeGenOpt::Default;
405 Options = TargetOptions();
406 RelocModel = Reloc::Default;
407 CMModel = CodeModel::JITDefault;
409 // IR module verification is enabled by default in debug builds, and disabled
410 // by default in release builds.
412 VerifyModules = true;
414 VerifyModules = false;
418 ExecutionEngine *EngineBuilder::create(TargetMachine *TM) {
419 std::unique_ptr<TargetMachine> TheTM(TM); // Take ownership.
421 // Make sure we can resolve symbols in the program as well. The zero arg
422 // to the function tells DynamicLibrary to load the program, not a library.
423 if (sys::DynamicLibrary::LoadLibraryPermanently(nullptr, ErrorStr))
426 // If the user specified a memory manager but didn't specify which engine to
427 // create, we assume they only want the JIT, and we fail if they only want
430 if (WhichEngine & EngineKind::JIT)
431 WhichEngine = EngineKind::JIT;
434 *ErrorStr = "Cannot create an interpreter with a memory manager.";
439 // Unless the interpreter was explicitly selected or the JIT is not linked,
441 if ((WhichEngine & EngineKind::JIT) && TheTM) {
442 Triple TT(M->getTargetTriple());
443 if (!TM->getTarget().hasJIT()) {
444 errs() << "WARNING: This target JIT is not designed for the host"
445 << " you are running. If bad things happen, please choose"
446 << " a different -march switch.\n";
449 ExecutionEngine *EE = nullptr;
450 if (ExecutionEngine::MCJITCtor)
451 EE = ExecutionEngine::MCJITCtor(std::move(M), ErrorStr, MCJMM,
454 EE->setVerifyModules(VerifyModules);
459 // If we can't make a JIT and we didn't request one specifically, try making
460 // an interpreter instead.
461 if (WhichEngine & EngineKind::Interpreter) {
462 if (ExecutionEngine::InterpCtor)
463 return ExecutionEngine::InterpCtor(std::move(M), ErrorStr);
465 *ErrorStr = "Interpreter has not been linked in.";
469 if ((WhichEngine & EngineKind::JIT) && !ExecutionEngine::MCJITCtor) {
471 *ErrorStr = "JIT has not been linked in.";
477 void *ExecutionEngine::getPointerToGlobal(const GlobalValue *GV) {
478 if (Function *F = const_cast<Function*>(dyn_cast<Function>(GV)))
479 return getPointerToFunction(F);
481 MutexGuard locked(lock);
482 if (void *P = EEState.getGlobalAddressMap()[GV])
485 // Global variable might have been added since interpreter started.
486 if (GlobalVariable *GVar =
487 const_cast<GlobalVariable *>(dyn_cast<GlobalVariable>(GV)))
488 EmitGlobalVariable(GVar);
490 llvm_unreachable("Global hasn't had an address allocated yet!");
492 return EEState.getGlobalAddressMap()[GV];
495 /// \brief Converts a Constant* into a GenericValue, including handling of
496 /// ConstantExpr values.
497 GenericValue ExecutionEngine::getConstantValue(const Constant *C) {
498 // If its undefined, return the garbage.
499 if (isa<UndefValue>(C)) {
501 switch (C->getType()->getTypeID()) {
504 case Type::IntegerTyID:
505 case Type::X86_FP80TyID:
506 case Type::FP128TyID:
507 case Type::PPC_FP128TyID:
508 // Although the value is undefined, we still have to construct an APInt
509 // with the correct bit width.
510 Result.IntVal = APInt(C->getType()->getPrimitiveSizeInBits(), 0);
512 case Type::StructTyID: {
513 // if the whole struct is 'undef' just reserve memory for the value.
514 if(StructType *STy = dyn_cast<StructType>(C->getType())) {
515 unsigned int elemNum = STy->getNumElements();
516 Result.AggregateVal.resize(elemNum);
517 for (unsigned int i = 0; i < elemNum; ++i) {
518 Type *ElemTy = STy->getElementType(i);
519 if (ElemTy->isIntegerTy())
520 Result.AggregateVal[i].IntVal =
521 APInt(ElemTy->getPrimitiveSizeInBits(), 0);
522 else if (ElemTy->isAggregateType()) {
523 const Constant *ElemUndef = UndefValue::get(ElemTy);
524 Result.AggregateVal[i] = getConstantValue(ElemUndef);
530 case Type::VectorTyID:
531 // if the whole vector is 'undef' just reserve memory for the value.
532 const VectorType* VTy = dyn_cast<VectorType>(C->getType());
533 const Type *ElemTy = VTy->getElementType();
534 unsigned int elemNum = VTy->getNumElements();
535 Result.AggregateVal.resize(elemNum);
536 if (ElemTy->isIntegerTy())
537 for (unsigned int i = 0; i < elemNum; ++i)
538 Result.AggregateVal[i].IntVal =
539 APInt(ElemTy->getPrimitiveSizeInBits(), 0);
545 // Otherwise, if the value is a ConstantExpr...
546 if (const ConstantExpr *CE = dyn_cast<ConstantExpr>(C)) {
547 Constant *Op0 = CE->getOperand(0);
548 switch (CE->getOpcode()) {
549 case Instruction::GetElementPtr: {
551 GenericValue Result = getConstantValue(Op0);
552 APInt Offset(DL->getPointerSizeInBits(), 0);
553 cast<GEPOperator>(CE)->accumulateConstantOffset(*DL, Offset);
555 char* tmp = (char*) Result.PointerVal;
556 Result = PTOGV(tmp + Offset.getSExtValue());
559 case Instruction::Trunc: {
560 GenericValue GV = getConstantValue(Op0);
561 uint32_t BitWidth = cast<IntegerType>(CE->getType())->getBitWidth();
562 GV.IntVal = GV.IntVal.trunc(BitWidth);
565 case Instruction::ZExt: {
566 GenericValue GV = getConstantValue(Op0);
567 uint32_t BitWidth = cast<IntegerType>(CE->getType())->getBitWidth();
568 GV.IntVal = GV.IntVal.zext(BitWidth);
571 case Instruction::SExt: {
572 GenericValue GV = getConstantValue(Op0);
573 uint32_t BitWidth = cast<IntegerType>(CE->getType())->getBitWidth();
574 GV.IntVal = GV.IntVal.sext(BitWidth);
577 case Instruction::FPTrunc: {
579 GenericValue GV = getConstantValue(Op0);
580 GV.FloatVal = float(GV.DoubleVal);
583 case Instruction::FPExt:{
585 GenericValue GV = getConstantValue(Op0);
586 GV.DoubleVal = double(GV.FloatVal);
589 case Instruction::UIToFP: {
590 GenericValue GV = getConstantValue(Op0);
591 if (CE->getType()->isFloatTy())
592 GV.FloatVal = float(GV.IntVal.roundToDouble());
593 else if (CE->getType()->isDoubleTy())
594 GV.DoubleVal = GV.IntVal.roundToDouble();
595 else if (CE->getType()->isX86_FP80Ty()) {
596 APFloat apf = APFloat::getZero(APFloat::x87DoubleExtended);
597 (void)apf.convertFromAPInt(GV.IntVal,
599 APFloat::rmNearestTiesToEven);
600 GV.IntVal = apf.bitcastToAPInt();
604 case Instruction::SIToFP: {
605 GenericValue GV = getConstantValue(Op0);
606 if (CE->getType()->isFloatTy())
607 GV.FloatVal = float(GV.IntVal.signedRoundToDouble());
608 else if (CE->getType()->isDoubleTy())
609 GV.DoubleVal = GV.IntVal.signedRoundToDouble();
610 else if (CE->getType()->isX86_FP80Ty()) {
611 APFloat apf = APFloat::getZero(APFloat::x87DoubleExtended);
612 (void)apf.convertFromAPInt(GV.IntVal,
614 APFloat::rmNearestTiesToEven);
615 GV.IntVal = apf.bitcastToAPInt();
619 case Instruction::FPToUI: // double->APInt conversion handles sign
620 case Instruction::FPToSI: {
621 GenericValue GV = getConstantValue(Op0);
622 uint32_t BitWidth = cast<IntegerType>(CE->getType())->getBitWidth();
623 if (Op0->getType()->isFloatTy())
624 GV.IntVal = APIntOps::RoundFloatToAPInt(GV.FloatVal, BitWidth);
625 else if (Op0->getType()->isDoubleTy())
626 GV.IntVal = APIntOps::RoundDoubleToAPInt(GV.DoubleVal, BitWidth);
627 else if (Op0->getType()->isX86_FP80Ty()) {
628 APFloat apf = APFloat(APFloat::x87DoubleExtended, GV.IntVal);
631 (void)apf.convertToInteger(&v, BitWidth,
632 CE->getOpcode()==Instruction::FPToSI,
633 APFloat::rmTowardZero, &ignored);
634 GV.IntVal = v; // endian?
638 case Instruction::PtrToInt: {
639 GenericValue GV = getConstantValue(Op0);
640 uint32_t PtrWidth = DL->getTypeSizeInBits(Op0->getType());
641 assert(PtrWidth <= 64 && "Bad pointer width");
642 GV.IntVal = APInt(PtrWidth, uintptr_t(GV.PointerVal));
643 uint32_t IntWidth = DL->getTypeSizeInBits(CE->getType());
644 GV.IntVal = GV.IntVal.zextOrTrunc(IntWidth);
647 case Instruction::IntToPtr: {
648 GenericValue GV = getConstantValue(Op0);
649 uint32_t PtrWidth = DL->getTypeSizeInBits(CE->getType());
650 GV.IntVal = GV.IntVal.zextOrTrunc(PtrWidth);
651 assert(GV.IntVal.getBitWidth() <= 64 && "Bad pointer width");
652 GV.PointerVal = PointerTy(uintptr_t(GV.IntVal.getZExtValue()));
655 case Instruction::BitCast: {
656 GenericValue GV = getConstantValue(Op0);
657 Type* DestTy = CE->getType();
658 switch (Op0->getType()->getTypeID()) {
659 default: llvm_unreachable("Invalid bitcast operand");
660 case Type::IntegerTyID:
661 assert(DestTy->isFloatingPointTy() && "invalid bitcast");
662 if (DestTy->isFloatTy())
663 GV.FloatVal = GV.IntVal.bitsToFloat();
664 else if (DestTy->isDoubleTy())
665 GV.DoubleVal = GV.IntVal.bitsToDouble();
667 case Type::FloatTyID:
668 assert(DestTy->isIntegerTy(32) && "Invalid bitcast");
669 GV.IntVal = APInt::floatToBits(GV.FloatVal);
671 case Type::DoubleTyID:
672 assert(DestTy->isIntegerTy(64) && "Invalid bitcast");
673 GV.IntVal = APInt::doubleToBits(GV.DoubleVal);
675 case Type::PointerTyID:
676 assert(DestTy->isPointerTy() && "Invalid bitcast");
677 break; // getConstantValue(Op0) above already converted it
681 case Instruction::Add:
682 case Instruction::FAdd:
683 case Instruction::Sub:
684 case Instruction::FSub:
685 case Instruction::Mul:
686 case Instruction::FMul:
687 case Instruction::UDiv:
688 case Instruction::SDiv:
689 case Instruction::URem:
690 case Instruction::SRem:
691 case Instruction::And:
692 case Instruction::Or:
693 case Instruction::Xor: {
694 GenericValue LHS = getConstantValue(Op0);
695 GenericValue RHS = getConstantValue(CE->getOperand(1));
697 switch (CE->getOperand(0)->getType()->getTypeID()) {
698 default: llvm_unreachable("Bad add type!");
699 case Type::IntegerTyID:
700 switch (CE->getOpcode()) {
701 default: llvm_unreachable("Invalid integer opcode");
702 case Instruction::Add: GV.IntVal = LHS.IntVal + RHS.IntVal; break;
703 case Instruction::Sub: GV.IntVal = LHS.IntVal - RHS.IntVal; break;
704 case Instruction::Mul: GV.IntVal = LHS.IntVal * RHS.IntVal; break;
705 case Instruction::UDiv:GV.IntVal = LHS.IntVal.udiv(RHS.IntVal); break;
706 case Instruction::SDiv:GV.IntVal = LHS.IntVal.sdiv(RHS.IntVal); break;
707 case Instruction::URem:GV.IntVal = LHS.IntVal.urem(RHS.IntVal); break;
708 case Instruction::SRem:GV.IntVal = LHS.IntVal.srem(RHS.IntVal); break;
709 case Instruction::And: GV.IntVal = LHS.IntVal & RHS.IntVal; break;
710 case Instruction::Or: GV.IntVal = LHS.IntVal | RHS.IntVal; break;
711 case Instruction::Xor: GV.IntVal = LHS.IntVal ^ RHS.IntVal; break;
714 case Type::FloatTyID:
715 switch (CE->getOpcode()) {
716 default: llvm_unreachable("Invalid float opcode");
717 case Instruction::FAdd:
718 GV.FloatVal = LHS.FloatVal + RHS.FloatVal; break;
719 case Instruction::FSub:
720 GV.FloatVal = LHS.FloatVal - RHS.FloatVal; break;
721 case Instruction::FMul:
722 GV.FloatVal = LHS.FloatVal * RHS.FloatVal; break;
723 case Instruction::FDiv:
724 GV.FloatVal = LHS.FloatVal / RHS.FloatVal; break;
725 case Instruction::FRem:
726 GV.FloatVal = std::fmod(LHS.FloatVal,RHS.FloatVal); break;
729 case Type::DoubleTyID:
730 switch (CE->getOpcode()) {
731 default: llvm_unreachable("Invalid double opcode");
732 case Instruction::FAdd:
733 GV.DoubleVal = LHS.DoubleVal + RHS.DoubleVal; break;
734 case Instruction::FSub:
735 GV.DoubleVal = LHS.DoubleVal - RHS.DoubleVal; break;
736 case Instruction::FMul:
737 GV.DoubleVal = LHS.DoubleVal * RHS.DoubleVal; break;
738 case Instruction::FDiv:
739 GV.DoubleVal = LHS.DoubleVal / RHS.DoubleVal; break;
740 case Instruction::FRem:
741 GV.DoubleVal = std::fmod(LHS.DoubleVal,RHS.DoubleVal); break;
744 case Type::X86_FP80TyID:
745 case Type::PPC_FP128TyID:
746 case Type::FP128TyID: {
747 const fltSemantics &Sem = CE->getOperand(0)->getType()->getFltSemantics();
748 APFloat apfLHS = APFloat(Sem, LHS.IntVal);
749 switch (CE->getOpcode()) {
750 default: llvm_unreachable("Invalid long double opcode");
751 case Instruction::FAdd:
752 apfLHS.add(APFloat(Sem, RHS.IntVal), APFloat::rmNearestTiesToEven);
753 GV.IntVal = apfLHS.bitcastToAPInt();
755 case Instruction::FSub:
756 apfLHS.subtract(APFloat(Sem, RHS.IntVal),
757 APFloat::rmNearestTiesToEven);
758 GV.IntVal = apfLHS.bitcastToAPInt();
760 case Instruction::FMul:
761 apfLHS.multiply(APFloat(Sem, RHS.IntVal),
762 APFloat::rmNearestTiesToEven);
763 GV.IntVal = apfLHS.bitcastToAPInt();
765 case Instruction::FDiv:
766 apfLHS.divide(APFloat(Sem, RHS.IntVal),
767 APFloat::rmNearestTiesToEven);
768 GV.IntVal = apfLHS.bitcastToAPInt();
770 case Instruction::FRem:
771 apfLHS.mod(APFloat(Sem, RHS.IntVal),
772 APFloat::rmNearestTiesToEven);
773 GV.IntVal = apfLHS.bitcastToAPInt();
785 SmallString<256> Msg;
786 raw_svector_ostream OS(Msg);
787 OS << "ConstantExpr not handled: " << *CE;
788 report_fatal_error(OS.str());
791 // Otherwise, we have a simple constant.
793 switch (C->getType()->getTypeID()) {
794 case Type::FloatTyID:
795 Result.FloatVal = cast<ConstantFP>(C)->getValueAPF().convertToFloat();
797 case Type::DoubleTyID:
798 Result.DoubleVal = cast<ConstantFP>(C)->getValueAPF().convertToDouble();
800 case Type::X86_FP80TyID:
801 case Type::FP128TyID:
802 case Type::PPC_FP128TyID:
803 Result.IntVal = cast <ConstantFP>(C)->getValueAPF().bitcastToAPInt();
805 case Type::IntegerTyID:
806 Result.IntVal = cast<ConstantInt>(C)->getValue();
808 case Type::PointerTyID:
809 if (isa<ConstantPointerNull>(C))
810 Result.PointerVal = nullptr;
811 else if (const Function *F = dyn_cast<Function>(C))
812 Result = PTOGV(getPointerToFunctionOrStub(const_cast<Function*>(F)));
813 else if (const GlobalVariable *GV = dyn_cast<GlobalVariable>(C))
814 Result = PTOGV(getOrEmitGlobalVariable(const_cast<GlobalVariable*>(GV)));
816 llvm_unreachable("Unknown constant pointer type!");
818 case Type::VectorTyID: {
821 const ConstantDataVector *CDV = dyn_cast<ConstantDataVector>(C);
822 const ConstantVector *CV = dyn_cast<ConstantVector>(C);
823 const ConstantAggregateZero *CAZ = dyn_cast<ConstantAggregateZero>(C);
826 elemNum = CDV->getNumElements();
827 ElemTy = CDV->getElementType();
828 } else if (CV || CAZ) {
829 VectorType* VTy = dyn_cast<VectorType>(C->getType());
830 elemNum = VTy->getNumElements();
831 ElemTy = VTy->getElementType();
833 llvm_unreachable("Unknown constant vector type!");
836 Result.AggregateVal.resize(elemNum);
837 // Check if vector holds floats.
838 if(ElemTy->isFloatTy()) {
840 GenericValue floatZero;
841 floatZero.FloatVal = 0.f;
842 std::fill(Result.AggregateVal.begin(), Result.AggregateVal.end(),
847 for (unsigned i = 0; i < elemNum; ++i)
848 if (!isa<UndefValue>(CV->getOperand(i)))
849 Result.AggregateVal[i].FloatVal = cast<ConstantFP>(
850 CV->getOperand(i))->getValueAPF().convertToFloat();
854 for (unsigned i = 0; i < elemNum; ++i)
855 Result.AggregateVal[i].FloatVal = CDV->getElementAsFloat(i);
859 // Check if vector holds doubles.
860 if (ElemTy->isDoubleTy()) {
862 GenericValue doubleZero;
863 doubleZero.DoubleVal = 0.0;
864 std::fill(Result.AggregateVal.begin(), Result.AggregateVal.end(),
869 for (unsigned i = 0; i < elemNum; ++i)
870 if (!isa<UndefValue>(CV->getOperand(i)))
871 Result.AggregateVal[i].DoubleVal = cast<ConstantFP>(
872 CV->getOperand(i))->getValueAPF().convertToDouble();
876 for (unsigned i = 0; i < elemNum; ++i)
877 Result.AggregateVal[i].DoubleVal = CDV->getElementAsDouble(i);
881 // Check if vector holds integers.
882 if (ElemTy->isIntegerTy()) {
884 GenericValue intZero;
885 intZero.IntVal = APInt(ElemTy->getScalarSizeInBits(), 0ull);
886 std::fill(Result.AggregateVal.begin(), Result.AggregateVal.end(),
891 for (unsigned i = 0; i < elemNum; ++i)
892 if (!isa<UndefValue>(CV->getOperand(i)))
893 Result.AggregateVal[i].IntVal = cast<ConstantInt>(
894 CV->getOperand(i))->getValue();
896 Result.AggregateVal[i].IntVal =
897 APInt(CV->getOperand(i)->getType()->getPrimitiveSizeInBits(), 0);
902 for (unsigned i = 0; i < elemNum; ++i)
903 Result.AggregateVal[i].IntVal = APInt(
904 CDV->getElementType()->getPrimitiveSizeInBits(),
905 CDV->getElementAsInteger(i));
909 llvm_unreachable("Unknown constant pointer type!");
914 SmallString<256> Msg;
915 raw_svector_ostream OS(Msg);
916 OS << "ERROR: Constant unimplemented for type: " << *C->getType();
917 report_fatal_error(OS.str());
923 /// StoreIntToMemory - Fills the StoreBytes bytes of memory starting from Dst
924 /// with the integer held in IntVal.
925 static void StoreIntToMemory(const APInt &IntVal, uint8_t *Dst,
926 unsigned StoreBytes) {
927 assert((IntVal.getBitWidth()+7)/8 >= StoreBytes && "Integer too small!");
928 const uint8_t *Src = (const uint8_t *)IntVal.getRawData();
930 if (sys::IsLittleEndianHost) {
931 // Little-endian host - the source is ordered from LSB to MSB. Order the
932 // destination from LSB to MSB: Do a straight copy.
933 memcpy(Dst, Src, StoreBytes);
935 // Big-endian host - the source is an array of 64 bit words ordered from
936 // LSW to MSW. Each word is ordered from MSB to LSB. Order the destination
937 // from MSB to LSB: Reverse the word order, but not the bytes in a word.
938 while (StoreBytes > sizeof(uint64_t)) {
939 StoreBytes -= sizeof(uint64_t);
940 // May not be aligned so use memcpy.
941 memcpy(Dst + StoreBytes, Src, sizeof(uint64_t));
942 Src += sizeof(uint64_t);
945 memcpy(Dst, Src + sizeof(uint64_t) - StoreBytes, StoreBytes);
949 void ExecutionEngine::StoreValueToMemory(const GenericValue &Val,
950 GenericValue *Ptr, Type *Ty) {
951 const unsigned StoreBytes = getDataLayout()->getTypeStoreSize(Ty);
953 switch (Ty->getTypeID()) {
955 dbgs() << "Cannot store value of type " << *Ty << "!\n";
957 case Type::IntegerTyID:
958 StoreIntToMemory(Val.IntVal, (uint8_t*)Ptr, StoreBytes);
960 case Type::FloatTyID:
961 *((float*)Ptr) = Val.FloatVal;
963 case Type::DoubleTyID:
964 *((double*)Ptr) = Val.DoubleVal;
966 case Type::X86_FP80TyID:
967 memcpy(Ptr, Val.IntVal.getRawData(), 10);
969 case Type::PointerTyID:
970 // Ensure 64 bit target pointers are fully initialized on 32 bit hosts.
971 if (StoreBytes != sizeof(PointerTy))
972 memset(&(Ptr->PointerVal), 0, StoreBytes);
974 *((PointerTy*)Ptr) = Val.PointerVal;
976 case Type::VectorTyID:
977 for (unsigned i = 0; i < Val.AggregateVal.size(); ++i) {
978 if (cast<VectorType>(Ty)->getElementType()->isDoubleTy())
979 *(((double*)Ptr)+i) = Val.AggregateVal[i].DoubleVal;
980 if (cast<VectorType>(Ty)->getElementType()->isFloatTy())
981 *(((float*)Ptr)+i) = Val.AggregateVal[i].FloatVal;
982 if (cast<VectorType>(Ty)->getElementType()->isIntegerTy()) {
983 unsigned numOfBytes =(Val.AggregateVal[i].IntVal.getBitWidth()+7)/8;
984 StoreIntToMemory(Val.AggregateVal[i].IntVal,
985 (uint8_t*)Ptr + numOfBytes*i, numOfBytes);
991 if (sys::IsLittleEndianHost != getDataLayout()->isLittleEndian())
992 // Host and target are different endian - reverse the stored bytes.
993 std::reverse((uint8_t*)Ptr, StoreBytes + (uint8_t*)Ptr);
996 /// LoadIntFromMemory - Loads the integer stored in the LoadBytes bytes starting
997 /// from Src into IntVal, which is assumed to be wide enough and to hold zero.
998 static void LoadIntFromMemory(APInt &IntVal, uint8_t *Src, unsigned LoadBytes) {
999 assert((IntVal.getBitWidth()+7)/8 >= LoadBytes && "Integer too small!");
1000 uint8_t *Dst = reinterpret_cast<uint8_t *>(
1001 const_cast<uint64_t *>(IntVal.getRawData()));
1003 if (sys::IsLittleEndianHost)
1004 // Little-endian host - the destination must be ordered from LSB to MSB.
1005 // The source is ordered from LSB to MSB: Do a straight copy.
1006 memcpy(Dst, Src, LoadBytes);
1008 // Big-endian - the destination is an array of 64 bit words ordered from
1009 // LSW to MSW. Each word must be ordered from MSB to LSB. The source is
1010 // ordered from MSB to LSB: Reverse the word order, but not the bytes in
1012 while (LoadBytes > sizeof(uint64_t)) {
1013 LoadBytes -= sizeof(uint64_t);
1014 // May not be aligned so use memcpy.
1015 memcpy(Dst, Src + LoadBytes, sizeof(uint64_t));
1016 Dst += sizeof(uint64_t);
1019 memcpy(Dst + sizeof(uint64_t) - LoadBytes, Src, LoadBytes);
1025 void ExecutionEngine::LoadValueFromMemory(GenericValue &Result,
1028 const unsigned LoadBytes = getDataLayout()->getTypeStoreSize(Ty);
1030 switch (Ty->getTypeID()) {
1031 case Type::IntegerTyID:
1032 // An APInt with all words initially zero.
1033 Result.IntVal = APInt(cast<IntegerType>(Ty)->getBitWidth(), 0);
1034 LoadIntFromMemory(Result.IntVal, (uint8_t*)Ptr, LoadBytes);
1036 case Type::FloatTyID:
1037 Result.FloatVal = *((float*)Ptr);
1039 case Type::DoubleTyID:
1040 Result.DoubleVal = *((double*)Ptr);
1042 case Type::PointerTyID:
1043 Result.PointerVal = *((PointerTy*)Ptr);
1045 case Type::X86_FP80TyID: {
1046 // This is endian dependent, but it will only work on x86 anyway.
1047 // FIXME: Will not trap if loading a signaling NaN.
1050 Result.IntVal = APInt(80, y);
1053 case Type::VectorTyID: {
1054 const VectorType *VT = cast<VectorType>(Ty);
1055 const Type *ElemT = VT->getElementType();
1056 const unsigned numElems = VT->getNumElements();
1057 if (ElemT->isFloatTy()) {
1058 Result.AggregateVal.resize(numElems);
1059 for (unsigned i = 0; i < numElems; ++i)
1060 Result.AggregateVal[i].FloatVal = *((float*)Ptr+i);
1062 if (ElemT->isDoubleTy()) {
1063 Result.AggregateVal.resize(numElems);
1064 for (unsigned i = 0; i < numElems; ++i)
1065 Result.AggregateVal[i].DoubleVal = *((double*)Ptr+i);
1067 if (ElemT->isIntegerTy()) {
1068 GenericValue intZero;
1069 const unsigned elemBitWidth = cast<IntegerType>(ElemT)->getBitWidth();
1070 intZero.IntVal = APInt(elemBitWidth, 0);
1071 Result.AggregateVal.resize(numElems, intZero);
1072 for (unsigned i = 0; i < numElems; ++i)
1073 LoadIntFromMemory(Result.AggregateVal[i].IntVal,
1074 (uint8_t*)Ptr+((elemBitWidth+7)/8)*i, (elemBitWidth+7)/8);
1079 SmallString<256> Msg;
1080 raw_svector_ostream OS(Msg);
1081 OS << "Cannot load value of type " << *Ty << "!";
1082 report_fatal_error(OS.str());
1086 void ExecutionEngine::InitializeMemory(const Constant *Init, void *Addr) {
1087 DEBUG(dbgs() << "JIT: Initializing " << Addr << " ");
1088 DEBUG(Init->dump());
1089 if (isa<UndefValue>(Init))
1092 if (const ConstantVector *CP = dyn_cast<ConstantVector>(Init)) {
1093 unsigned ElementSize =
1094 getDataLayout()->getTypeAllocSize(CP->getType()->getElementType());
1095 for (unsigned i = 0, e = CP->getNumOperands(); i != e; ++i)
1096 InitializeMemory(CP->getOperand(i), (char*)Addr+i*ElementSize);
1100 if (isa<ConstantAggregateZero>(Init)) {
1101 memset(Addr, 0, (size_t)getDataLayout()->getTypeAllocSize(Init->getType()));
1105 if (const ConstantArray *CPA = dyn_cast<ConstantArray>(Init)) {
1106 unsigned ElementSize =
1107 getDataLayout()->getTypeAllocSize(CPA->getType()->getElementType());
1108 for (unsigned i = 0, e = CPA->getNumOperands(); i != e; ++i)
1109 InitializeMemory(CPA->getOperand(i), (char*)Addr+i*ElementSize);
1113 if (const ConstantStruct *CPS = dyn_cast<ConstantStruct>(Init)) {
1114 const StructLayout *SL =
1115 getDataLayout()->getStructLayout(cast<StructType>(CPS->getType()));
1116 for (unsigned i = 0, e = CPS->getNumOperands(); i != e; ++i)
1117 InitializeMemory(CPS->getOperand(i), (char*)Addr+SL->getElementOffset(i));
1121 if (const ConstantDataSequential *CDS =
1122 dyn_cast<ConstantDataSequential>(Init)) {
1123 // CDS is already laid out in host memory order.
1124 StringRef Data = CDS->getRawDataValues();
1125 memcpy(Addr, Data.data(), Data.size());
1129 if (Init->getType()->isFirstClassType()) {
1130 GenericValue Val = getConstantValue(Init);
1131 StoreValueToMemory(Val, (GenericValue*)Addr, Init->getType());
1135 DEBUG(dbgs() << "Bad Type: " << *Init->getType() << "\n");
1136 llvm_unreachable("Unknown constant type to initialize memory with!");
1139 /// EmitGlobals - Emit all of the global variables to memory, storing their
1140 /// addresses into GlobalAddress. This must make sure to copy the contents of
1141 /// their initializers into the memory.
1142 void ExecutionEngine::emitGlobals() {
1143 // Loop over all of the global variables in the program, allocating the memory
1144 // to hold them. If there is more than one module, do a prepass over globals
1145 // to figure out how the different modules should link together.
1146 std::map<std::pair<std::string, Type*>,
1147 const GlobalValue*> LinkedGlobalsMap;
1149 if (Modules.size() != 1) {
1150 for (unsigned m = 0, e = Modules.size(); m != e; ++m) {
1151 Module &M = *Modules[m];
1152 for (const auto &GV : M.globals()) {
1153 if (GV.hasLocalLinkage() || GV.isDeclaration() ||
1154 GV.hasAppendingLinkage() || !GV.hasName())
1155 continue;// Ignore external globals and globals with internal linkage.
1157 const GlobalValue *&GVEntry =
1158 LinkedGlobalsMap[std::make_pair(GV.getName(), GV.getType())];
1160 // If this is the first time we've seen this global, it is the canonical
1167 // If the existing global is strong, never replace it.
1168 if (GVEntry->hasExternalLinkage())
1171 // Otherwise, we know it's linkonce/weak, replace it if this is a strong
1172 // symbol. FIXME is this right for common?
1173 if (GV.hasExternalLinkage() || GVEntry->hasExternalWeakLinkage())
1179 std::vector<const GlobalValue*> NonCanonicalGlobals;
1180 for (unsigned m = 0, e = Modules.size(); m != e; ++m) {
1181 Module &M = *Modules[m];
1182 for (const auto &GV : M.globals()) {
1183 // In the multi-module case, see what this global maps to.
1184 if (!LinkedGlobalsMap.empty()) {
1185 if (const GlobalValue *GVEntry =
1186 LinkedGlobalsMap[std::make_pair(GV.getName(), GV.getType())]) {
1187 // If something else is the canonical global, ignore this one.
1188 if (GVEntry != &GV) {
1189 NonCanonicalGlobals.push_back(&GV);
1195 if (!GV.isDeclaration()) {
1196 addGlobalMapping(&GV, getMemoryForGV(&GV));
1198 // External variable reference. Try to use the dynamic loader to
1199 // get a pointer to it.
1201 sys::DynamicLibrary::SearchForAddressOfSymbol(GV.getName()))
1202 addGlobalMapping(&GV, SymAddr);
1204 report_fatal_error("Could not resolve external global address: "
1210 // If there are multiple modules, map the non-canonical globals to their
1211 // canonical location.
1212 if (!NonCanonicalGlobals.empty()) {
1213 for (unsigned i = 0, e = NonCanonicalGlobals.size(); i != e; ++i) {
1214 const GlobalValue *GV = NonCanonicalGlobals[i];
1215 const GlobalValue *CGV =
1216 LinkedGlobalsMap[std::make_pair(GV->getName(), GV->getType())];
1217 void *Ptr = getPointerToGlobalIfAvailable(CGV);
1218 assert(Ptr && "Canonical global wasn't codegen'd!");
1219 addGlobalMapping(GV, Ptr);
1223 // Now that all of the globals are set up in memory, loop through them all
1224 // and initialize their contents.
1225 for (const auto &GV : M.globals()) {
1226 if (!GV.isDeclaration()) {
1227 if (!LinkedGlobalsMap.empty()) {
1228 if (const GlobalValue *GVEntry =
1229 LinkedGlobalsMap[std::make_pair(GV.getName(), GV.getType())])
1230 if (GVEntry != &GV) // Not the canonical variable.
1233 EmitGlobalVariable(&GV);
1239 // EmitGlobalVariable - This method emits the specified global variable to the
1240 // address specified in GlobalAddresses, or allocates new memory if it's not
1241 // already in the map.
1242 void ExecutionEngine::EmitGlobalVariable(const GlobalVariable *GV) {
1243 void *GA = getPointerToGlobalIfAvailable(GV);
1246 // If it's not already specified, allocate memory for the global.
1247 GA = getMemoryForGV(GV);
1249 // If we failed to allocate memory for this global, return.
1252 addGlobalMapping(GV, GA);
1255 // Don't initialize if it's thread local, let the client do it.
1256 if (!GV->isThreadLocal())
1257 InitializeMemory(GV->getInitializer(), GA);
1259 Type *ElTy = GV->getType()->getElementType();
1260 size_t GVSize = (size_t)getDataLayout()->getTypeAllocSize(ElTy);
1261 NumInitBytes += (unsigned)GVSize;
1265 ExecutionEngineState::ExecutionEngineState(ExecutionEngine &EE)
1266 : EE(EE), GlobalAddressMap(this) {
1270 ExecutionEngineState::AddressMapConfig::getMutex(ExecutionEngineState *EES) {
1271 return &EES->EE.lock;
1274 void ExecutionEngineState::AddressMapConfig::onDelete(ExecutionEngineState *EES,
1275 const GlobalValue *Old) {
1276 void *OldVal = EES->GlobalAddressMap.lookup(Old);
1277 EES->GlobalAddressReverseMap.erase(OldVal);
1280 void ExecutionEngineState::AddressMapConfig::onRAUW(ExecutionEngineState *,
1281 const GlobalValue *,
1282 const GlobalValue *) {
1283 llvm_unreachable("The ExecutionEngine doesn't know how to handle a"
1284 " RAUW on a value it has a global mapping for.");