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/STLExtras.h"
17 #include "llvm/ADT/SmallString.h"
18 #include "llvm/ADT/Statistic.h"
19 #include "llvm/ExecutionEngine/GenericValue.h"
20 #include "llvm/ExecutionEngine/JITEventListener.h"
21 #include "llvm/ExecutionEngine/RTDyldMemoryManager.h"
22 #include "llvm/IR/Constants.h"
23 #include "llvm/IR/DataLayout.h"
24 #include "llvm/IR/DerivedTypes.h"
25 #include "llvm/IR/Mangler.h"
26 #include "llvm/IR/Module.h"
27 #include "llvm/IR/Operator.h"
28 #include "llvm/IR/ValueHandle.h"
29 #include "llvm/Object/Archive.h"
30 #include "llvm/Object/ObjectFile.h"
31 #include "llvm/Support/Debug.h"
32 #include "llvm/Support/DynamicLibrary.h"
33 #include "llvm/Support/ErrorHandling.h"
34 #include "llvm/Support/Host.h"
35 #include "llvm/Support/MutexGuard.h"
36 #include "llvm/Support/TargetRegistry.h"
37 #include "llvm/Support/raw_ostream.h"
38 #include "llvm/Target/TargetMachine.h"
43 #define DEBUG_TYPE "jit"
45 STATISTIC(NumInitBytes, "Number of bytes of global vars initialized");
46 STATISTIC(NumGlobals , "Number of global vars initialized");
48 ExecutionEngine *(*ExecutionEngine::MCJITCtor)(
49 std::unique_ptr<Module> M, std::string *ErrorStr,
50 std::shared_ptr<MCJITMemoryManager> MemMgr,
51 std::shared_ptr<RuntimeDyld::SymbolResolver> Resolver,
52 std::unique_ptr<TargetMachine> TM) = nullptr;
54 ExecutionEngine *(*ExecutionEngine::OrcMCJITReplacementCtor)(
55 std::string *ErrorStr, std::shared_ptr<MCJITMemoryManager> MemMgr,
56 std::shared_ptr<RuntimeDyld::SymbolResolver> Resolver,
57 std::unique_ptr<TargetMachine> TM) = nullptr;
59 ExecutionEngine *(*ExecutionEngine::InterpCtor)(std::unique_ptr<Module> M,
60 std::string *ErrorStr) =nullptr;
62 void JITEventListener::anchor() {}
64 void ExecutionEngine::Init(std::unique_ptr<Module> M) {
65 CompilingLazily = false;
66 GVCompilationDisabled = false;
67 SymbolSearchingDisabled = false;
69 // IR module verification is enabled by default in debug builds, and disabled
70 // by default in release builds.
74 VerifyModules = false;
77 assert(M && "Module is null?");
78 Modules.push_back(std::move(M));
81 ExecutionEngine::ExecutionEngine(std::unique_ptr<Module> M)
82 : DL(M->getDataLayout()), LazyFunctionCreator(nullptr) {
86 ExecutionEngine::ExecutionEngine(DataLayout DL, std::unique_ptr<Module> M)
87 : DL(std::move(DL)), LazyFunctionCreator(nullptr) {
91 ExecutionEngine::~ExecutionEngine() {
92 clearAllGlobalMappings();
96 /// \brief Helper class which uses a value handler to automatically deletes the
97 /// memory block when the GlobalVariable is destroyed.
98 class GVMemoryBlock final : public CallbackVH {
99 GVMemoryBlock(const GlobalVariable *GV)
100 : CallbackVH(const_cast<GlobalVariable*>(GV)) {}
103 /// \brief Returns the address the GlobalVariable should be written into. The
104 /// GVMemoryBlock object prefixes that.
105 static char *Create(const GlobalVariable *GV, const DataLayout& TD) {
106 Type *ElTy = GV->getType()->getElementType();
107 size_t GVSize = (size_t)TD.getTypeAllocSize(ElTy);
108 void *RawMemory = ::operator new(
109 RoundUpToAlignment(sizeof(GVMemoryBlock),
110 TD.getPreferredAlignment(GV))
112 new(RawMemory) GVMemoryBlock(GV);
113 return static_cast<char*>(RawMemory) + sizeof(GVMemoryBlock);
116 void deleted() override {
117 // We allocated with operator new and with some extra memory hanging off the
118 // end, so don't just delete this. I'm not sure if this is actually
120 this->~GVMemoryBlock();
121 ::operator delete(this);
124 } // anonymous namespace
126 char *ExecutionEngine::getMemoryForGV(const GlobalVariable *GV) {
127 return GVMemoryBlock::Create(GV, getDataLayout());
130 void ExecutionEngine::addObjectFile(std::unique_ptr<object::ObjectFile> O) {
131 llvm_unreachable("ExecutionEngine subclass doesn't implement addObjectFile.");
135 ExecutionEngine::addObjectFile(object::OwningBinary<object::ObjectFile> O) {
136 llvm_unreachable("ExecutionEngine subclass doesn't implement addObjectFile.");
139 void ExecutionEngine::addArchive(object::OwningBinary<object::Archive> A) {
140 llvm_unreachable("ExecutionEngine subclass doesn't implement addArchive.");
143 bool ExecutionEngine::removeModule(Module *M) {
144 for (auto I = Modules.begin(), E = Modules.end(); I != E; ++I) {
145 Module *Found = I->get();
149 clearGlobalMappingsFromModule(M);
156 Function *ExecutionEngine::FindFunctionNamed(const char *FnName) {
157 for (unsigned i = 0, e = Modules.size(); i != e; ++i) {
158 Function *F = Modules[i]->getFunction(FnName);
159 if (F && !F->isDeclaration())
165 GlobalVariable *ExecutionEngine::FindGlobalVariableNamed(const char *Name, bool AllowInternal) {
166 for (unsigned i = 0, e = Modules.size(); i != e; ++i) {
167 GlobalVariable *GV = Modules[i]->getGlobalVariable(Name,AllowInternal);
168 if (GV && !GV->isDeclaration())
174 uint64_t ExecutionEngineState::RemoveMapping(StringRef Name) {
175 GlobalAddressMapTy::iterator I = GlobalAddressMap.find(Name);
178 // FIXME: This is silly, we shouldn't end up with a mapping -> 0 in the
180 if (I == GlobalAddressMap.end())
183 GlobalAddressReverseMap.erase(I->second);
185 GlobalAddressMap.erase(I);
191 std::string ExecutionEngine::getMangledName(const GlobalValue *GV) {
192 assert(GV->hasName() && "Global must have name.");
194 MutexGuard locked(lock);
195 SmallString<128> FullName;
197 const DataLayout &DL =
198 GV->getParent()->getDataLayout().isDefault()
200 : GV->getParent()->getDataLayout();
202 Mangler::getNameWithPrefix(FullName, GV->getName(), DL);
203 return FullName.str();
206 void ExecutionEngine::addGlobalMapping(const GlobalValue *GV, void *Addr) {
207 MutexGuard locked(lock);
208 addGlobalMapping(getMangledName(GV), (uint64_t) Addr);
211 void ExecutionEngine::addGlobalMapping(StringRef Name, uint64_t Addr) {
212 MutexGuard locked(lock);
214 assert(!Name.empty() && "Empty GlobalMapping symbol name!");
216 DEBUG(dbgs() << "JIT: Map \'" << Name << "\' to [" << Addr << "]\n";);
217 uint64_t &CurVal = EEState.getGlobalAddressMap()[Name];
218 assert((!CurVal || !Addr) && "GlobalMapping already established!");
221 // If we are using the reverse mapping, add it too.
222 if (!EEState.getGlobalAddressReverseMap().empty()) {
223 std::string &V = EEState.getGlobalAddressReverseMap()[CurVal];
224 assert((!V.empty() || !Name.empty()) &&
225 "GlobalMapping already established!");
230 void ExecutionEngine::clearAllGlobalMappings() {
231 MutexGuard locked(lock);
233 EEState.getGlobalAddressMap().clear();
234 EEState.getGlobalAddressReverseMap().clear();
237 void ExecutionEngine::clearGlobalMappingsFromModule(Module *M) {
238 MutexGuard locked(lock);
240 for (Module::iterator FI = M->begin(), FE = M->end(); FI != FE; ++FI)
241 EEState.RemoveMapping(getMangledName(FI));
242 for (Module::global_iterator GI = M->global_begin(), GE = M->global_end();
244 EEState.RemoveMapping(getMangledName(GI));
247 uint64_t ExecutionEngine::updateGlobalMapping(const GlobalValue *GV,
249 MutexGuard locked(lock);
250 return updateGlobalMapping(getMangledName(GV), (uint64_t) Addr);
253 uint64_t ExecutionEngine::updateGlobalMapping(StringRef Name, uint64_t Addr) {
254 MutexGuard locked(lock);
256 ExecutionEngineState::GlobalAddressMapTy &Map =
257 EEState.getGlobalAddressMap();
259 // Deleting from the mapping?
261 return EEState.RemoveMapping(Name);
263 uint64_t &CurVal = Map[Name];
264 uint64_t OldVal = CurVal;
266 if (CurVal && !EEState.getGlobalAddressReverseMap().empty())
267 EEState.getGlobalAddressReverseMap().erase(CurVal);
270 // If we are using the reverse mapping, add it too.
271 if (!EEState.getGlobalAddressReverseMap().empty()) {
272 std::string &V = EEState.getGlobalAddressReverseMap()[CurVal];
273 assert((!V.empty() || !Name.empty()) &&
274 "GlobalMapping already established!");
280 uint64_t ExecutionEngine::getAddressToGlobalIfAvailable(StringRef S) {
281 MutexGuard locked(lock);
282 uint64_t Address = 0;
283 ExecutionEngineState::GlobalAddressMapTy::iterator I =
284 EEState.getGlobalAddressMap().find(S);
285 if (I != EEState.getGlobalAddressMap().end())
291 void *ExecutionEngine::getPointerToGlobalIfAvailable(StringRef S) {
292 MutexGuard locked(lock);
293 if (void* Address = (void *) getAddressToGlobalIfAvailable(S))
298 void *ExecutionEngine::getPointerToGlobalIfAvailable(const GlobalValue *GV) {
299 MutexGuard locked(lock);
300 return getPointerToGlobalIfAvailable(getMangledName(GV));
303 const GlobalValue *ExecutionEngine::getGlobalValueAtAddress(void *Addr) {
304 MutexGuard locked(lock);
306 // If we haven't computed the reverse mapping yet, do so first.
307 if (EEState.getGlobalAddressReverseMap().empty()) {
308 for (ExecutionEngineState::GlobalAddressMapTy::iterator
309 I = EEState.getGlobalAddressMap().begin(),
310 E = EEState.getGlobalAddressMap().end(); I != E; ++I) {
311 StringRef Name = I->first();
312 uint64_t Addr = I->second;
313 EEState.getGlobalAddressReverseMap().insert(std::make_pair(
318 std::map<uint64_t, std::string>::iterator I =
319 EEState.getGlobalAddressReverseMap().find((uint64_t) Addr);
321 if (I != EEState.getGlobalAddressReverseMap().end()) {
322 StringRef Name = I->second;
323 for (unsigned i = 0, e = Modules.size(); i != e; ++i)
324 if (GlobalValue *GV = Modules[i]->getNamedValue(Name))
332 std::unique_ptr<char[]> Array;
333 std::vector<std::unique_ptr<char[]>> Values;
335 /// Turn a vector of strings into a nice argv style array of pointers to null
336 /// terminated strings.
337 void *reset(LLVMContext &C, ExecutionEngine *EE,
338 const std::vector<std::string> &InputArgv);
340 } // anonymous namespace
341 void *ArgvArray::reset(LLVMContext &C, ExecutionEngine *EE,
342 const std::vector<std::string> &InputArgv) {
343 Values.clear(); // Free the old contents.
344 Values.reserve(InputArgv.size());
345 unsigned PtrSize = EE->getDataLayout().getPointerSize();
346 Array = make_unique<char[]>((InputArgv.size()+1)*PtrSize);
348 DEBUG(dbgs() << "JIT: ARGV = " << (void*)Array.get() << "\n");
349 Type *SBytePtr = Type::getInt8PtrTy(C);
351 for (unsigned i = 0; i != InputArgv.size(); ++i) {
352 unsigned Size = InputArgv[i].size()+1;
353 auto Dest = make_unique<char[]>(Size);
354 DEBUG(dbgs() << "JIT: ARGV[" << i << "] = " << (void*)Dest.get() << "\n");
356 std::copy(InputArgv[i].begin(), InputArgv[i].end(), Dest.get());
359 // Endian safe: Array[i] = (PointerTy)Dest;
360 EE->StoreValueToMemory(PTOGV(Dest.get()),
361 (GenericValue*)(&Array[i*PtrSize]), SBytePtr);
362 Values.push_back(std::move(Dest));
366 EE->StoreValueToMemory(PTOGV(nullptr),
367 (GenericValue*)(&Array[InputArgv.size()*PtrSize]),
372 void ExecutionEngine::runStaticConstructorsDestructors(Module &module,
374 const char *Name = isDtors ? "llvm.global_dtors" : "llvm.global_ctors";
375 GlobalVariable *GV = module.getNamedGlobal(Name);
377 // If this global has internal linkage, or if it has a use, then it must be
378 // an old-style (llvmgcc3) static ctor with __main linked in and in use. If
379 // this is the case, don't execute any of the global ctors, __main will do
381 if (!GV || GV->isDeclaration() || GV->hasLocalLinkage()) return;
383 // Should be an array of '{ i32, void ()* }' structs. The first value is
384 // the init priority, which we ignore.
385 ConstantArray *InitList = dyn_cast<ConstantArray>(GV->getInitializer());
388 for (unsigned i = 0, e = InitList->getNumOperands(); i != e; ++i) {
389 ConstantStruct *CS = dyn_cast<ConstantStruct>(InitList->getOperand(i));
392 Constant *FP = CS->getOperand(1);
393 if (FP->isNullValue())
394 continue; // Found a sentinal value, ignore.
396 // Strip off constant expression casts.
397 if (ConstantExpr *CE = dyn_cast<ConstantExpr>(FP))
399 FP = CE->getOperand(0);
401 // Execute the ctor/dtor function!
402 if (Function *F = dyn_cast<Function>(FP))
403 runFunction(F, None);
405 // FIXME: It is marginally lame that we just do nothing here if we see an
406 // entry we don't recognize. It might not be unreasonable for the verifier
407 // to not even allow this and just assert here.
411 void ExecutionEngine::runStaticConstructorsDestructors(bool isDtors) {
412 // Execute global ctors/dtors for each module in the program.
413 for (std::unique_ptr<Module> &M : Modules)
414 runStaticConstructorsDestructors(*M, isDtors);
418 /// isTargetNullPtr - Return whether the target pointer stored at Loc is null.
419 static bool isTargetNullPtr(ExecutionEngine *EE, void *Loc) {
420 unsigned PtrSize = EE->getDataLayout().getPointerSize();
421 for (unsigned i = 0; i < PtrSize; ++i)
422 if (*(i + (uint8_t*)Loc))
428 int ExecutionEngine::runFunctionAsMain(Function *Fn,
429 const std::vector<std::string> &argv,
430 const char * const * envp) {
431 std::vector<GenericValue> GVArgs;
433 GVArgc.IntVal = APInt(32, argv.size());
436 unsigned NumArgs = Fn->getFunctionType()->getNumParams();
437 FunctionType *FTy = Fn->getFunctionType();
438 Type* PPInt8Ty = Type::getInt8PtrTy(Fn->getContext())->getPointerTo();
440 // Check the argument types.
442 report_fatal_error("Invalid number of arguments of main() supplied");
443 if (NumArgs >= 3 && FTy->getParamType(2) != PPInt8Ty)
444 report_fatal_error("Invalid type for third argument of main() supplied");
445 if (NumArgs >= 2 && FTy->getParamType(1) != PPInt8Ty)
446 report_fatal_error("Invalid type for second argument of main() supplied");
447 if (NumArgs >= 1 && !FTy->getParamType(0)->isIntegerTy(32))
448 report_fatal_error("Invalid type for first argument of main() supplied");
449 if (!FTy->getReturnType()->isIntegerTy() &&
450 !FTy->getReturnType()->isVoidTy())
451 report_fatal_error("Invalid return type of main() supplied");
456 GVArgs.push_back(GVArgc); // Arg #0 = argc.
459 GVArgs.push_back(PTOGV(CArgv.reset(Fn->getContext(), this, argv)));
460 assert(!isTargetNullPtr(this, GVTOP(GVArgs[1])) &&
461 "argv[0] was null after CreateArgv");
463 std::vector<std::string> EnvVars;
464 for (unsigned i = 0; envp[i]; ++i)
465 EnvVars.emplace_back(envp[i]);
467 GVArgs.push_back(PTOGV(CEnv.reset(Fn->getContext(), this, EnvVars)));
472 return runFunction(Fn, GVArgs).IntVal.getZExtValue();
475 EngineBuilder::EngineBuilder() : EngineBuilder(nullptr) {}
477 EngineBuilder::EngineBuilder(std::unique_ptr<Module> M)
478 : M(std::move(M)), WhichEngine(EngineKind::Either), ErrorStr(nullptr),
479 OptLevel(CodeGenOpt::Default), MemMgr(nullptr), Resolver(nullptr),
480 RelocModel(Reloc::Default), CMModel(CodeModel::JITDefault),
481 UseOrcMCJITReplacement(false) {
482 // IR module verification is enabled by default in debug builds, and disabled
483 // by default in release builds.
485 VerifyModules = true;
487 VerifyModules = false;
491 EngineBuilder::~EngineBuilder() = default;
493 EngineBuilder &EngineBuilder::setMCJITMemoryManager(
494 std::unique_ptr<RTDyldMemoryManager> mcjmm) {
495 auto SharedMM = std::shared_ptr<RTDyldMemoryManager>(std::move(mcjmm));
502 EngineBuilder::setMemoryManager(std::unique_ptr<MCJITMemoryManager> MM) {
503 MemMgr = std::shared_ptr<MCJITMemoryManager>(std::move(MM));
508 EngineBuilder::setSymbolResolver(std::unique_ptr<RuntimeDyld::SymbolResolver> SR) {
509 Resolver = std::shared_ptr<RuntimeDyld::SymbolResolver>(std::move(SR));
513 ExecutionEngine *EngineBuilder::create(TargetMachine *TM) {
514 std::unique_ptr<TargetMachine> TheTM(TM); // Take ownership.
516 // Make sure we can resolve symbols in the program as well. The zero arg
517 // to the function tells DynamicLibrary to load the program, not a library.
518 if (sys::DynamicLibrary::LoadLibraryPermanently(nullptr, ErrorStr))
521 // If the user specified a memory manager but didn't specify which engine to
522 // create, we assume they only want the JIT, and we fail if they only want
525 if (WhichEngine & EngineKind::JIT)
526 WhichEngine = EngineKind::JIT;
529 *ErrorStr = "Cannot create an interpreter with a memory manager.";
534 // Unless the interpreter was explicitly selected or the JIT is not linked,
536 if ((WhichEngine & EngineKind::JIT) && TheTM) {
537 Triple TT(M->getTargetTriple());
538 if (!TM->getTarget().hasJIT()) {
539 errs() << "WARNING: This target JIT is not designed for the host"
540 << " you are running. If bad things happen, please choose"
541 << " a different -march switch.\n";
544 ExecutionEngine *EE = nullptr;
545 if (ExecutionEngine::OrcMCJITReplacementCtor && UseOrcMCJITReplacement) {
546 EE = ExecutionEngine::OrcMCJITReplacementCtor(ErrorStr, std::move(MemMgr),
549 EE->addModule(std::move(M));
550 } else if (ExecutionEngine::MCJITCtor)
551 EE = ExecutionEngine::MCJITCtor(std::move(M), ErrorStr, std::move(MemMgr),
552 std::move(Resolver), std::move(TheTM));
555 EE->setVerifyModules(VerifyModules);
560 // If we can't make a JIT and we didn't request one specifically, try making
561 // an interpreter instead.
562 if (WhichEngine & EngineKind::Interpreter) {
563 if (ExecutionEngine::InterpCtor)
564 return ExecutionEngine::InterpCtor(std::move(M), ErrorStr);
566 *ErrorStr = "Interpreter has not been linked in.";
570 if ((WhichEngine & EngineKind::JIT) && !ExecutionEngine::MCJITCtor) {
572 *ErrorStr = "JIT has not been linked in.";
578 void *ExecutionEngine::getPointerToGlobal(const GlobalValue *GV) {
579 if (Function *F = const_cast<Function*>(dyn_cast<Function>(GV)))
580 return getPointerToFunction(F);
582 MutexGuard locked(lock);
583 if (void* P = getPointerToGlobalIfAvailable(GV))
586 // Global variable might have been added since interpreter started.
587 if (GlobalVariable *GVar =
588 const_cast<GlobalVariable *>(dyn_cast<GlobalVariable>(GV)))
589 EmitGlobalVariable(GVar);
591 llvm_unreachable("Global hasn't had an address allocated yet!");
593 return getPointerToGlobalIfAvailable(GV);
596 /// \brief Converts a Constant* into a GenericValue, including handling of
597 /// ConstantExpr values.
598 GenericValue ExecutionEngine::getConstantValue(const Constant *C) {
599 // If its undefined, return the garbage.
600 if (isa<UndefValue>(C)) {
602 switch (C->getType()->getTypeID()) {
605 case Type::IntegerTyID:
606 case Type::X86_FP80TyID:
607 case Type::FP128TyID:
608 case Type::PPC_FP128TyID:
609 // Although the value is undefined, we still have to construct an APInt
610 // with the correct bit width.
611 Result.IntVal = APInt(C->getType()->getPrimitiveSizeInBits(), 0);
613 case Type::StructTyID: {
614 // if the whole struct is 'undef' just reserve memory for the value.
615 if(StructType *STy = dyn_cast<StructType>(C->getType())) {
616 unsigned int elemNum = STy->getNumElements();
617 Result.AggregateVal.resize(elemNum);
618 for (unsigned int i = 0; i < elemNum; ++i) {
619 Type *ElemTy = STy->getElementType(i);
620 if (ElemTy->isIntegerTy())
621 Result.AggregateVal[i].IntVal =
622 APInt(ElemTy->getPrimitiveSizeInBits(), 0);
623 else if (ElemTy->isAggregateType()) {
624 const Constant *ElemUndef = UndefValue::get(ElemTy);
625 Result.AggregateVal[i] = getConstantValue(ElemUndef);
631 case Type::VectorTyID:
632 // if the whole vector is 'undef' just reserve memory for the value.
633 auto* VTy = dyn_cast<VectorType>(C->getType());
634 Type *ElemTy = VTy->getElementType();
635 unsigned int elemNum = VTy->getNumElements();
636 Result.AggregateVal.resize(elemNum);
637 if (ElemTy->isIntegerTy())
638 for (unsigned int i = 0; i < elemNum; ++i)
639 Result.AggregateVal[i].IntVal =
640 APInt(ElemTy->getPrimitiveSizeInBits(), 0);
646 // Otherwise, if the value is a ConstantExpr...
647 if (const ConstantExpr *CE = dyn_cast<ConstantExpr>(C)) {
648 Constant *Op0 = CE->getOperand(0);
649 switch (CE->getOpcode()) {
650 case Instruction::GetElementPtr: {
652 GenericValue Result = getConstantValue(Op0);
653 APInt Offset(DL.getPointerSizeInBits(), 0);
654 cast<GEPOperator>(CE)->accumulateConstantOffset(DL, Offset);
656 char* tmp = (char*) Result.PointerVal;
657 Result = PTOGV(tmp + Offset.getSExtValue());
660 case Instruction::Trunc: {
661 GenericValue GV = getConstantValue(Op0);
662 uint32_t BitWidth = cast<IntegerType>(CE->getType())->getBitWidth();
663 GV.IntVal = GV.IntVal.trunc(BitWidth);
666 case Instruction::ZExt: {
667 GenericValue GV = getConstantValue(Op0);
668 uint32_t BitWidth = cast<IntegerType>(CE->getType())->getBitWidth();
669 GV.IntVal = GV.IntVal.zext(BitWidth);
672 case Instruction::SExt: {
673 GenericValue GV = getConstantValue(Op0);
674 uint32_t BitWidth = cast<IntegerType>(CE->getType())->getBitWidth();
675 GV.IntVal = GV.IntVal.sext(BitWidth);
678 case Instruction::FPTrunc: {
680 GenericValue GV = getConstantValue(Op0);
681 GV.FloatVal = float(GV.DoubleVal);
684 case Instruction::FPExt:{
686 GenericValue GV = getConstantValue(Op0);
687 GV.DoubleVal = double(GV.FloatVal);
690 case Instruction::UIToFP: {
691 GenericValue GV = getConstantValue(Op0);
692 if (CE->getType()->isFloatTy())
693 GV.FloatVal = float(GV.IntVal.roundToDouble());
694 else if (CE->getType()->isDoubleTy())
695 GV.DoubleVal = GV.IntVal.roundToDouble();
696 else if (CE->getType()->isX86_FP80Ty()) {
697 APFloat apf = APFloat::getZero(APFloat::x87DoubleExtended);
698 (void)apf.convertFromAPInt(GV.IntVal,
700 APFloat::rmNearestTiesToEven);
701 GV.IntVal = apf.bitcastToAPInt();
705 case Instruction::SIToFP: {
706 GenericValue GV = getConstantValue(Op0);
707 if (CE->getType()->isFloatTy())
708 GV.FloatVal = float(GV.IntVal.signedRoundToDouble());
709 else if (CE->getType()->isDoubleTy())
710 GV.DoubleVal = GV.IntVal.signedRoundToDouble();
711 else if (CE->getType()->isX86_FP80Ty()) {
712 APFloat apf = APFloat::getZero(APFloat::x87DoubleExtended);
713 (void)apf.convertFromAPInt(GV.IntVal,
715 APFloat::rmNearestTiesToEven);
716 GV.IntVal = apf.bitcastToAPInt();
720 case Instruction::FPToUI: // double->APInt conversion handles sign
721 case Instruction::FPToSI: {
722 GenericValue GV = getConstantValue(Op0);
723 uint32_t BitWidth = cast<IntegerType>(CE->getType())->getBitWidth();
724 if (Op0->getType()->isFloatTy())
725 GV.IntVal = APIntOps::RoundFloatToAPInt(GV.FloatVal, BitWidth);
726 else if (Op0->getType()->isDoubleTy())
727 GV.IntVal = APIntOps::RoundDoubleToAPInt(GV.DoubleVal, BitWidth);
728 else if (Op0->getType()->isX86_FP80Ty()) {
729 APFloat apf = APFloat(APFloat::x87DoubleExtended, GV.IntVal);
732 (void)apf.convertToInteger(&v, BitWidth,
733 CE->getOpcode()==Instruction::FPToSI,
734 APFloat::rmTowardZero, &ignored);
735 GV.IntVal = v; // endian?
739 case Instruction::PtrToInt: {
740 GenericValue GV = getConstantValue(Op0);
741 uint32_t PtrWidth = DL.getTypeSizeInBits(Op0->getType());
742 assert(PtrWidth <= 64 && "Bad pointer width");
743 GV.IntVal = APInt(PtrWidth, uintptr_t(GV.PointerVal));
744 uint32_t IntWidth = DL.getTypeSizeInBits(CE->getType());
745 GV.IntVal = GV.IntVal.zextOrTrunc(IntWidth);
748 case Instruction::IntToPtr: {
749 GenericValue GV = getConstantValue(Op0);
750 uint32_t PtrWidth = DL.getTypeSizeInBits(CE->getType());
751 GV.IntVal = GV.IntVal.zextOrTrunc(PtrWidth);
752 assert(GV.IntVal.getBitWidth() <= 64 && "Bad pointer width");
753 GV.PointerVal = PointerTy(uintptr_t(GV.IntVal.getZExtValue()));
756 case Instruction::BitCast: {
757 GenericValue GV = getConstantValue(Op0);
758 Type* DestTy = CE->getType();
759 switch (Op0->getType()->getTypeID()) {
760 default: llvm_unreachable("Invalid bitcast operand");
761 case Type::IntegerTyID:
762 assert(DestTy->isFloatingPointTy() && "invalid bitcast");
763 if (DestTy->isFloatTy())
764 GV.FloatVal = GV.IntVal.bitsToFloat();
765 else if (DestTy->isDoubleTy())
766 GV.DoubleVal = GV.IntVal.bitsToDouble();
768 case Type::FloatTyID:
769 assert(DestTy->isIntegerTy(32) && "Invalid bitcast");
770 GV.IntVal = APInt::floatToBits(GV.FloatVal);
772 case Type::DoubleTyID:
773 assert(DestTy->isIntegerTy(64) && "Invalid bitcast");
774 GV.IntVal = APInt::doubleToBits(GV.DoubleVal);
776 case Type::PointerTyID:
777 assert(DestTy->isPointerTy() && "Invalid bitcast");
778 break; // getConstantValue(Op0) above already converted it
782 case Instruction::Add:
783 case Instruction::FAdd:
784 case Instruction::Sub:
785 case Instruction::FSub:
786 case Instruction::Mul:
787 case Instruction::FMul:
788 case Instruction::UDiv:
789 case Instruction::SDiv:
790 case Instruction::URem:
791 case Instruction::SRem:
792 case Instruction::And:
793 case Instruction::Or:
794 case Instruction::Xor: {
795 GenericValue LHS = getConstantValue(Op0);
796 GenericValue RHS = getConstantValue(CE->getOperand(1));
798 switch (CE->getOperand(0)->getType()->getTypeID()) {
799 default: llvm_unreachable("Bad add type!");
800 case Type::IntegerTyID:
801 switch (CE->getOpcode()) {
802 default: llvm_unreachable("Invalid integer opcode");
803 case Instruction::Add: GV.IntVal = LHS.IntVal + RHS.IntVal; break;
804 case Instruction::Sub: GV.IntVal = LHS.IntVal - RHS.IntVal; break;
805 case Instruction::Mul: GV.IntVal = LHS.IntVal * RHS.IntVal; break;
806 case Instruction::UDiv:GV.IntVal = LHS.IntVal.udiv(RHS.IntVal); break;
807 case Instruction::SDiv:GV.IntVal = LHS.IntVal.sdiv(RHS.IntVal); break;
808 case Instruction::URem:GV.IntVal = LHS.IntVal.urem(RHS.IntVal); break;
809 case Instruction::SRem:GV.IntVal = LHS.IntVal.srem(RHS.IntVal); break;
810 case Instruction::And: GV.IntVal = LHS.IntVal & RHS.IntVal; break;
811 case Instruction::Or: GV.IntVal = LHS.IntVal | RHS.IntVal; break;
812 case Instruction::Xor: GV.IntVal = LHS.IntVal ^ RHS.IntVal; break;
815 case Type::FloatTyID:
816 switch (CE->getOpcode()) {
817 default: llvm_unreachable("Invalid float opcode");
818 case Instruction::FAdd:
819 GV.FloatVal = LHS.FloatVal + RHS.FloatVal; break;
820 case Instruction::FSub:
821 GV.FloatVal = LHS.FloatVal - RHS.FloatVal; break;
822 case Instruction::FMul:
823 GV.FloatVal = LHS.FloatVal * RHS.FloatVal; break;
824 case Instruction::FDiv:
825 GV.FloatVal = LHS.FloatVal / RHS.FloatVal; break;
826 case Instruction::FRem:
827 GV.FloatVal = std::fmod(LHS.FloatVal,RHS.FloatVal); break;
830 case Type::DoubleTyID:
831 switch (CE->getOpcode()) {
832 default: llvm_unreachable("Invalid double opcode");
833 case Instruction::FAdd:
834 GV.DoubleVal = LHS.DoubleVal + RHS.DoubleVal; break;
835 case Instruction::FSub:
836 GV.DoubleVal = LHS.DoubleVal - RHS.DoubleVal; break;
837 case Instruction::FMul:
838 GV.DoubleVal = LHS.DoubleVal * RHS.DoubleVal; break;
839 case Instruction::FDiv:
840 GV.DoubleVal = LHS.DoubleVal / RHS.DoubleVal; break;
841 case Instruction::FRem:
842 GV.DoubleVal = std::fmod(LHS.DoubleVal,RHS.DoubleVal); break;
845 case Type::X86_FP80TyID:
846 case Type::PPC_FP128TyID:
847 case Type::FP128TyID: {
848 const fltSemantics &Sem = CE->getOperand(0)->getType()->getFltSemantics();
849 APFloat apfLHS = APFloat(Sem, LHS.IntVal);
850 switch (CE->getOpcode()) {
851 default: llvm_unreachable("Invalid long double opcode");
852 case Instruction::FAdd:
853 apfLHS.add(APFloat(Sem, RHS.IntVal), APFloat::rmNearestTiesToEven);
854 GV.IntVal = apfLHS.bitcastToAPInt();
856 case Instruction::FSub:
857 apfLHS.subtract(APFloat(Sem, RHS.IntVal),
858 APFloat::rmNearestTiesToEven);
859 GV.IntVal = apfLHS.bitcastToAPInt();
861 case Instruction::FMul:
862 apfLHS.multiply(APFloat(Sem, RHS.IntVal),
863 APFloat::rmNearestTiesToEven);
864 GV.IntVal = apfLHS.bitcastToAPInt();
866 case Instruction::FDiv:
867 apfLHS.divide(APFloat(Sem, RHS.IntVal),
868 APFloat::rmNearestTiesToEven);
869 GV.IntVal = apfLHS.bitcastToAPInt();
871 case Instruction::FRem:
872 apfLHS.mod(APFloat(Sem, RHS.IntVal));
873 GV.IntVal = apfLHS.bitcastToAPInt();
885 SmallString<256> Msg;
886 raw_svector_ostream OS(Msg);
887 OS << "ConstantExpr not handled: " << *CE;
888 report_fatal_error(OS.str());
891 // Otherwise, we have a simple constant.
893 switch (C->getType()->getTypeID()) {
894 case Type::FloatTyID:
895 Result.FloatVal = cast<ConstantFP>(C)->getValueAPF().convertToFloat();
897 case Type::DoubleTyID:
898 Result.DoubleVal = cast<ConstantFP>(C)->getValueAPF().convertToDouble();
900 case Type::X86_FP80TyID:
901 case Type::FP128TyID:
902 case Type::PPC_FP128TyID:
903 Result.IntVal = cast <ConstantFP>(C)->getValueAPF().bitcastToAPInt();
905 case Type::IntegerTyID:
906 Result.IntVal = cast<ConstantInt>(C)->getValue();
908 case Type::PointerTyID:
909 if (isa<ConstantPointerNull>(C))
910 Result.PointerVal = nullptr;
911 else if (const Function *F = dyn_cast<Function>(C))
912 Result = PTOGV(getPointerToFunctionOrStub(const_cast<Function*>(F)));
913 else if (const GlobalVariable *GV = dyn_cast<GlobalVariable>(C))
914 Result = PTOGV(getOrEmitGlobalVariable(const_cast<GlobalVariable*>(GV)));
916 llvm_unreachable("Unknown constant pointer type!");
918 case Type::VectorTyID: {
921 const ConstantDataVector *CDV = dyn_cast<ConstantDataVector>(C);
922 const ConstantVector *CV = dyn_cast<ConstantVector>(C);
923 const ConstantAggregateZero *CAZ = dyn_cast<ConstantAggregateZero>(C);
926 elemNum = CDV->getNumElements();
927 ElemTy = CDV->getElementType();
928 } else if (CV || CAZ) {
929 VectorType* VTy = dyn_cast<VectorType>(C->getType());
930 elemNum = VTy->getNumElements();
931 ElemTy = VTy->getElementType();
933 llvm_unreachable("Unknown constant vector type!");
936 Result.AggregateVal.resize(elemNum);
937 // Check if vector holds floats.
938 if(ElemTy->isFloatTy()) {
940 GenericValue floatZero;
941 floatZero.FloatVal = 0.f;
942 std::fill(Result.AggregateVal.begin(), Result.AggregateVal.end(),
947 for (unsigned i = 0; i < elemNum; ++i)
948 if (!isa<UndefValue>(CV->getOperand(i)))
949 Result.AggregateVal[i].FloatVal = cast<ConstantFP>(
950 CV->getOperand(i))->getValueAPF().convertToFloat();
954 for (unsigned i = 0; i < elemNum; ++i)
955 Result.AggregateVal[i].FloatVal = CDV->getElementAsFloat(i);
959 // Check if vector holds doubles.
960 if (ElemTy->isDoubleTy()) {
962 GenericValue doubleZero;
963 doubleZero.DoubleVal = 0.0;
964 std::fill(Result.AggregateVal.begin(), Result.AggregateVal.end(),
969 for (unsigned i = 0; i < elemNum; ++i)
970 if (!isa<UndefValue>(CV->getOperand(i)))
971 Result.AggregateVal[i].DoubleVal = cast<ConstantFP>(
972 CV->getOperand(i))->getValueAPF().convertToDouble();
976 for (unsigned i = 0; i < elemNum; ++i)
977 Result.AggregateVal[i].DoubleVal = CDV->getElementAsDouble(i);
981 // Check if vector holds integers.
982 if (ElemTy->isIntegerTy()) {
984 GenericValue intZero;
985 intZero.IntVal = APInt(ElemTy->getScalarSizeInBits(), 0ull);
986 std::fill(Result.AggregateVal.begin(), Result.AggregateVal.end(),
991 for (unsigned i = 0; i < elemNum; ++i)
992 if (!isa<UndefValue>(CV->getOperand(i)))
993 Result.AggregateVal[i].IntVal = cast<ConstantInt>(
994 CV->getOperand(i))->getValue();
996 Result.AggregateVal[i].IntVal =
997 APInt(CV->getOperand(i)->getType()->getPrimitiveSizeInBits(), 0);
1002 for (unsigned i = 0; i < elemNum; ++i)
1003 Result.AggregateVal[i].IntVal = APInt(
1004 CDV->getElementType()->getPrimitiveSizeInBits(),
1005 CDV->getElementAsInteger(i));
1009 llvm_unreachable("Unknown constant pointer type!");
1014 SmallString<256> Msg;
1015 raw_svector_ostream OS(Msg);
1016 OS << "ERROR: Constant unimplemented for type: " << *C->getType();
1017 report_fatal_error(OS.str());
1023 /// StoreIntToMemory - Fills the StoreBytes bytes of memory starting from Dst
1024 /// with the integer held in IntVal.
1025 static void StoreIntToMemory(const APInt &IntVal, uint8_t *Dst,
1026 unsigned StoreBytes) {
1027 assert((IntVal.getBitWidth()+7)/8 >= StoreBytes && "Integer too small!");
1028 const uint8_t *Src = (const uint8_t *)IntVal.getRawData();
1030 if (sys::IsLittleEndianHost) {
1031 // Little-endian host - the source is ordered from LSB to MSB. Order the
1032 // destination from LSB to MSB: Do a straight copy.
1033 memcpy(Dst, Src, StoreBytes);
1035 // Big-endian host - the source is an array of 64 bit words ordered from
1036 // LSW to MSW. Each word is ordered from MSB to LSB. Order the destination
1037 // from MSB to LSB: Reverse the word order, but not the bytes in a word.
1038 while (StoreBytes > sizeof(uint64_t)) {
1039 StoreBytes -= sizeof(uint64_t);
1040 // May not be aligned so use memcpy.
1041 memcpy(Dst + StoreBytes, Src, sizeof(uint64_t));
1042 Src += sizeof(uint64_t);
1045 memcpy(Dst, Src + sizeof(uint64_t) - StoreBytes, StoreBytes);
1049 void ExecutionEngine::StoreValueToMemory(const GenericValue &Val,
1050 GenericValue *Ptr, Type *Ty) {
1051 const unsigned StoreBytes = getDataLayout().getTypeStoreSize(Ty);
1053 switch (Ty->getTypeID()) {
1055 dbgs() << "Cannot store value of type " << *Ty << "!\n";
1057 case Type::IntegerTyID:
1058 StoreIntToMemory(Val.IntVal, (uint8_t*)Ptr, StoreBytes);
1060 case Type::FloatTyID:
1061 *((float*)Ptr) = Val.FloatVal;
1063 case Type::DoubleTyID:
1064 *((double*)Ptr) = Val.DoubleVal;
1066 case Type::X86_FP80TyID:
1067 memcpy(Ptr, Val.IntVal.getRawData(), 10);
1069 case Type::PointerTyID:
1070 // Ensure 64 bit target pointers are fully initialized on 32 bit hosts.
1071 if (StoreBytes != sizeof(PointerTy))
1072 memset(&(Ptr->PointerVal), 0, StoreBytes);
1074 *((PointerTy*)Ptr) = Val.PointerVal;
1076 case Type::VectorTyID:
1077 for (unsigned i = 0; i < Val.AggregateVal.size(); ++i) {
1078 if (cast<VectorType>(Ty)->getElementType()->isDoubleTy())
1079 *(((double*)Ptr)+i) = Val.AggregateVal[i].DoubleVal;
1080 if (cast<VectorType>(Ty)->getElementType()->isFloatTy())
1081 *(((float*)Ptr)+i) = Val.AggregateVal[i].FloatVal;
1082 if (cast<VectorType>(Ty)->getElementType()->isIntegerTy()) {
1083 unsigned numOfBytes =(Val.AggregateVal[i].IntVal.getBitWidth()+7)/8;
1084 StoreIntToMemory(Val.AggregateVal[i].IntVal,
1085 (uint8_t*)Ptr + numOfBytes*i, numOfBytes);
1091 if (sys::IsLittleEndianHost != getDataLayout().isLittleEndian())
1092 // Host and target are different endian - reverse the stored bytes.
1093 std::reverse((uint8_t*)Ptr, StoreBytes + (uint8_t*)Ptr);
1096 /// LoadIntFromMemory - Loads the integer stored in the LoadBytes bytes starting
1097 /// from Src into IntVal, which is assumed to be wide enough and to hold zero.
1098 static void LoadIntFromMemory(APInt &IntVal, uint8_t *Src, unsigned LoadBytes) {
1099 assert((IntVal.getBitWidth()+7)/8 >= LoadBytes && "Integer too small!");
1100 uint8_t *Dst = reinterpret_cast<uint8_t *>(
1101 const_cast<uint64_t *>(IntVal.getRawData()));
1103 if (sys::IsLittleEndianHost)
1104 // Little-endian host - the destination must be ordered from LSB to MSB.
1105 // The source is ordered from LSB to MSB: Do a straight copy.
1106 memcpy(Dst, Src, LoadBytes);
1108 // Big-endian - the destination is an array of 64 bit words ordered from
1109 // LSW to MSW. Each word must be ordered from MSB to LSB. The source is
1110 // ordered from MSB to LSB: Reverse the word order, but not the bytes in
1112 while (LoadBytes > sizeof(uint64_t)) {
1113 LoadBytes -= sizeof(uint64_t);
1114 // May not be aligned so use memcpy.
1115 memcpy(Dst, Src + LoadBytes, sizeof(uint64_t));
1116 Dst += sizeof(uint64_t);
1119 memcpy(Dst + sizeof(uint64_t) - LoadBytes, Src, LoadBytes);
1125 void ExecutionEngine::LoadValueFromMemory(GenericValue &Result,
1128 const unsigned LoadBytes = getDataLayout().getTypeStoreSize(Ty);
1130 switch (Ty->getTypeID()) {
1131 case Type::IntegerTyID:
1132 // An APInt with all words initially zero.
1133 Result.IntVal = APInt(cast<IntegerType>(Ty)->getBitWidth(), 0);
1134 LoadIntFromMemory(Result.IntVal, (uint8_t*)Ptr, LoadBytes);
1136 case Type::FloatTyID:
1137 Result.FloatVal = *((float*)Ptr);
1139 case Type::DoubleTyID:
1140 Result.DoubleVal = *((double*)Ptr);
1142 case Type::PointerTyID:
1143 Result.PointerVal = *((PointerTy*)Ptr);
1145 case Type::X86_FP80TyID: {
1146 // This is endian dependent, but it will only work on x86 anyway.
1147 // FIXME: Will not trap if loading a signaling NaN.
1150 Result.IntVal = APInt(80, y);
1153 case Type::VectorTyID: {
1154 auto *VT = cast<VectorType>(Ty);
1155 Type *ElemT = VT->getElementType();
1156 const unsigned numElems = VT->getNumElements();
1157 if (ElemT->isFloatTy()) {
1158 Result.AggregateVal.resize(numElems);
1159 for (unsigned i = 0; i < numElems; ++i)
1160 Result.AggregateVal[i].FloatVal = *((float*)Ptr+i);
1162 if (ElemT->isDoubleTy()) {
1163 Result.AggregateVal.resize(numElems);
1164 for (unsigned i = 0; i < numElems; ++i)
1165 Result.AggregateVal[i].DoubleVal = *((double*)Ptr+i);
1167 if (ElemT->isIntegerTy()) {
1168 GenericValue intZero;
1169 const unsigned elemBitWidth = cast<IntegerType>(ElemT)->getBitWidth();
1170 intZero.IntVal = APInt(elemBitWidth, 0);
1171 Result.AggregateVal.resize(numElems, intZero);
1172 for (unsigned i = 0; i < numElems; ++i)
1173 LoadIntFromMemory(Result.AggregateVal[i].IntVal,
1174 (uint8_t*)Ptr+((elemBitWidth+7)/8)*i, (elemBitWidth+7)/8);
1179 SmallString<256> Msg;
1180 raw_svector_ostream OS(Msg);
1181 OS << "Cannot load value of type " << *Ty << "!";
1182 report_fatal_error(OS.str());
1186 void ExecutionEngine::InitializeMemory(const Constant *Init, void *Addr) {
1187 DEBUG(dbgs() << "JIT: Initializing " << Addr << " ");
1188 DEBUG(Init->dump());
1189 if (isa<UndefValue>(Init))
1192 if (const ConstantVector *CP = dyn_cast<ConstantVector>(Init)) {
1193 unsigned ElementSize =
1194 getDataLayout().getTypeAllocSize(CP->getType()->getElementType());
1195 for (unsigned i = 0, e = CP->getNumOperands(); i != e; ++i)
1196 InitializeMemory(CP->getOperand(i), (char*)Addr+i*ElementSize);
1200 if (isa<ConstantAggregateZero>(Init)) {
1201 memset(Addr, 0, (size_t)getDataLayout().getTypeAllocSize(Init->getType()));
1205 if (const ConstantArray *CPA = dyn_cast<ConstantArray>(Init)) {
1206 unsigned ElementSize =
1207 getDataLayout().getTypeAllocSize(CPA->getType()->getElementType());
1208 for (unsigned i = 0, e = CPA->getNumOperands(); i != e; ++i)
1209 InitializeMemory(CPA->getOperand(i), (char*)Addr+i*ElementSize);
1213 if (const ConstantStruct *CPS = dyn_cast<ConstantStruct>(Init)) {
1214 const StructLayout *SL =
1215 getDataLayout().getStructLayout(cast<StructType>(CPS->getType()));
1216 for (unsigned i = 0, e = CPS->getNumOperands(); i != e; ++i)
1217 InitializeMemory(CPS->getOperand(i), (char*)Addr+SL->getElementOffset(i));
1221 if (const ConstantDataSequential *CDS =
1222 dyn_cast<ConstantDataSequential>(Init)) {
1223 // CDS is already laid out in host memory order.
1224 StringRef Data = CDS->getRawDataValues();
1225 memcpy(Addr, Data.data(), Data.size());
1229 if (Init->getType()->isFirstClassType()) {
1230 GenericValue Val = getConstantValue(Init);
1231 StoreValueToMemory(Val, (GenericValue*)Addr, Init->getType());
1235 DEBUG(dbgs() << "Bad Type: " << *Init->getType() << "\n");
1236 llvm_unreachable("Unknown constant type to initialize memory with!");
1239 /// EmitGlobals - Emit all of the global variables to memory, storing their
1240 /// addresses into GlobalAddress. This must make sure to copy the contents of
1241 /// their initializers into the memory.
1242 void ExecutionEngine::emitGlobals() {
1243 // Loop over all of the global variables in the program, allocating the memory
1244 // to hold them. If there is more than one module, do a prepass over globals
1245 // to figure out how the different modules should link together.
1246 std::map<std::pair<std::string, Type*>,
1247 const GlobalValue*> LinkedGlobalsMap;
1249 if (Modules.size() != 1) {
1250 for (unsigned m = 0, e = Modules.size(); m != e; ++m) {
1251 Module &M = *Modules[m];
1252 for (const auto &GV : M.globals()) {
1253 if (GV.hasLocalLinkage() || GV.isDeclaration() ||
1254 GV.hasAppendingLinkage() || !GV.hasName())
1255 continue;// Ignore external globals and globals with internal linkage.
1257 const GlobalValue *&GVEntry =
1258 LinkedGlobalsMap[std::make_pair(GV.getName(), GV.getType())];
1260 // If this is the first time we've seen this global, it is the canonical
1267 // If the existing global is strong, never replace it.
1268 if (GVEntry->hasExternalLinkage())
1271 // Otherwise, we know it's linkonce/weak, replace it if this is a strong
1272 // symbol. FIXME is this right for common?
1273 if (GV.hasExternalLinkage() || GVEntry->hasExternalWeakLinkage())
1279 std::vector<const GlobalValue*> NonCanonicalGlobals;
1280 for (unsigned m = 0, e = Modules.size(); m != e; ++m) {
1281 Module &M = *Modules[m];
1282 for (const auto &GV : M.globals()) {
1283 // In the multi-module case, see what this global maps to.
1284 if (!LinkedGlobalsMap.empty()) {
1285 if (const GlobalValue *GVEntry =
1286 LinkedGlobalsMap[std::make_pair(GV.getName(), GV.getType())]) {
1287 // If something else is the canonical global, ignore this one.
1288 if (GVEntry != &GV) {
1289 NonCanonicalGlobals.push_back(&GV);
1295 if (!GV.isDeclaration()) {
1296 addGlobalMapping(&GV, getMemoryForGV(&GV));
1298 // External variable reference. Try to use the dynamic loader to
1299 // get a pointer to it.
1301 sys::DynamicLibrary::SearchForAddressOfSymbol(GV.getName()))
1302 addGlobalMapping(&GV, SymAddr);
1304 report_fatal_error("Could not resolve external global address: "
1310 // If there are multiple modules, map the non-canonical globals to their
1311 // canonical location.
1312 if (!NonCanonicalGlobals.empty()) {
1313 for (unsigned i = 0, e = NonCanonicalGlobals.size(); i != e; ++i) {
1314 const GlobalValue *GV = NonCanonicalGlobals[i];
1315 const GlobalValue *CGV =
1316 LinkedGlobalsMap[std::make_pair(GV->getName(), GV->getType())];
1317 void *Ptr = getPointerToGlobalIfAvailable(CGV);
1318 assert(Ptr && "Canonical global wasn't codegen'd!");
1319 addGlobalMapping(GV, Ptr);
1323 // Now that all of the globals are set up in memory, loop through them all
1324 // and initialize their contents.
1325 for (const auto &GV : M.globals()) {
1326 if (!GV.isDeclaration()) {
1327 if (!LinkedGlobalsMap.empty()) {
1328 if (const GlobalValue *GVEntry =
1329 LinkedGlobalsMap[std::make_pair(GV.getName(), GV.getType())])
1330 if (GVEntry != &GV) // Not the canonical variable.
1333 EmitGlobalVariable(&GV);
1339 // EmitGlobalVariable - This method emits the specified global variable to the
1340 // address specified in GlobalAddresses, or allocates new memory if it's not
1341 // already in the map.
1342 void ExecutionEngine::EmitGlobalVariable(const GlobalVariable *GV) {
1343 void *GA = getPointerToGlobalIfAvailable(GV);
1346 // If it's not already specified, allocate memory for the global.
1347 GA = getMemoryForGV(GV);
1349 // If we failed to allocate memory for this global, return.
1352 addGlobalMapping(GV, GA);
1355 // Don't initialize if it's thread local, let the client do it.
1356 if (!GV->isThreadLocal())
1357 InitializeMemory(GV->getInitializer(), GA);
1359 Type *ElTy = GV->getType()->getElementType();
1360 size_t GVSize = (size_t)getDataLayout().getTypeAllocSize(ElTy);
1361 NumInitBytes += (unsigned)GVSize;