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->getValueType();
107 size_t GVSize = (size_t)TD.getTypeAllocSize(ElTy);
108 void *RawMemory = ::operator new(
109 alignTo(sizeof(GVMemoryBlock), TD.getPreferredAlignment(GV)) + GVSize);
110 new(RawMemory) GVMemoryBlock(GV);
111 return static_cast<char*>(RawMemory) + sizeof(GVMemoryBlock);
114 void deleted() override {
115 // We allocated with operator new and with some extra memory hanging off the
116 // end, so don't just delete this. I'm not sure if this is actually
118 this->~GVMemoryBlock();
119 ::operator delete(this);
122 } // anonymous namespace
124 char *ExecutionEngine::getMemoryForGV(const GlobalVariable *GV) {
125 return GVMemoryBlock::Create(GV, getDataLayout());
128 void ExecutionEngine::addObjectFile(std::unique_ptr<object::ObjectFile> O) {
129 llvm_unreachable("ExecutionEngine subclass doesn't implement addObjectFile.");
133 ExecutionEngine::addObjectFile(object::OwningBinary<object::ObjectFile> O) {
134 llvm_unreachable("ExecutionEngine subclass doesn't implement addObjectFile.");
137 void ExecutionEngine::addArchive(object::OwningBinary<object::Archive> A) {
138 llvm_unreachable("ExecutionEngine subclass doesn't implement addArchive.");
141 bool ExecutionEngine::removeModule(Module *M) {
142 for (auto I = Modules.begin(), E = Modules.end(); I != E; ++I) {
143 Module *Found = I->get();
147 clearGlobalMappingsFromModule(M);
154 Function *ExecutionEngine::FindFunctionNamed(const char *FnName) {
155 for (unsigned i = 0, e = Modules.size(); i != e; ++i) {
156 Function *F = Modules[i]->getFunction(FnName);
157 if (F && !F->isDeclaration())
163 GlobalVariable *ExecutionEngine::FindGlobalVariableNamed(const char *Name, bool AllowInternal) {
164 for (unsigned i = 0, e = Modules.size(); i != e; ++i) {
165 GlobalVariable *GV = Modules[i]->getGlobalVariable(Name,AllowInternal);
166 if (GV && !GV->isDeclaration())
172 uint64_t ExecutionEngineState::RemoveMapping(StringRef Name) {
173 GlobalAddressMapTy::iterator I = GlobalAddressMap.find(Name);
176 // FIXME: This is silly, we shouldn't end up with a mapping -> 0 in the
178 if (I == GlobalAddressMap.end())
181 GlobalAddressReverseMap.erase(I->second);
183 GlobalAddressMap.erase(I);
189 std::string ExecutionEngine::getMangledName(const GlobalValue *GV) {
190 assert(GV->hasName() && "Global must have name.");
192 MutexGuard locked(lock);
193 SmallString<128> FullName;
195 const DataLayout &DL =
196 GV->getParent()->getDataLayout().isDefault()
198 : GV->getParent()->getDataLayout();
200 Mangler::getNameWithPrefix(FullName, GV->getName(), DL);
201 return FullName.str();
204 void ExecutionEngine::addGlobalMapping(const GlobalValue *GV, void *Addr) {
205 MutexGuard locked(lock);
206 addGlobalMapping(getMangledName(GV), (uint64_t) Addr);
209 void ExecutionEngine::addGlobalMapping(StringRef Name, uint64_t Addr) {
210 MutexGuard locked(lock);
212 assert(!Name.empty() && "Empty GlobalMapping symbol name!");
214 DEBUG(dbgs() << "JIT: Map \'" << Name << "\' to [" << Addr << "]\n";);
215 uint64_t &CurVal = EEState.getGlobalAddressMap()[Name];
216 assert((!CurVal || !Addr) && "GlobalMapping already established!");
219 // If we are using the reverse mapping, add it too.
220 if (!EEState.getGlobalAddressReverseMap().empty()) {
221 std::string &V = EEState.getGlobalAddressReverseMap()[CurVal];
222 assert((!V.empty() || !Name.empty()) &&
223 "GlobalMapping already established!");
228 void ExecutionEngine::clearAllGlobalMappings() {
229 MutexGuard locked(lock);
231 EEState.getGlobalAddressMap().clear();
232 EEState.getGlobalAddressReverseMap().clear();
235 void ExecutionEngine::clearGlobalMappingsFromModule(Module *M) {
236 MutexGuard locked(lock);
238 for (GlobalObject &GO : M->global_objects())
239 EEState.RemoveMapping(getMangledName(&GO));
242 uint64_t ExecutionEngine::updateGlobalMapping(const GlobalValue *GV,
244 MutexGuard locked(lock);
245 return updateGlobalMapping(getMangledName(GV), (uint64_t) Addr);
248 uint64_t ExecutionEngine::updateGlobalMapping(StringRef Name, uint64_t Addr) {
249 MutexGuard locked(lock);
251 ExecutionEngineState::GlobalAddressMapTy &Map =
252 EEState.getGlobalAddressMap();
254 // Deleting from the mapping?
256 return EEState.RemoveMapping(Name);
258 uint64_t &CurVal = Map[Name];
259 uint64_t OldVal = CurVal;
261 if (CurVal && !EEState.getGlobalAddressReverseMap().empty())
262 EEState.getGlobalAddressReverseMap().erase(CurVal);
265 // If we are using the reverse mapping, add it too.
266 if (!EEState.getGlobalAddressReverseMap().empty()) {
267 std::string &V = EEState.getGlobalAddressReverseMap()[CurVal];
268 assert((!V.empty() || !Name.empty()) &&
269 "GlobalMapping already established!");
275 uint64_t ExecutionEngine::getAddressToGlobalIfAvailable(StringRef S) {
276 MutexGuard locked(lock);
277 uint64_t Address = 0;
278 ExecutionEngineState::GlobalAddressMapTy::iterator I =
279 EEState.getGlobalAddressMap().find(S);
280 if (I != EEState.getGlobalAddressMap().end())
286 void *ExecutionEngine::getPointerToGlobalIfAvailable(StringRef S) {
287 MutexGuard locked(lock);
288 if (void* Address = (void *) getAddressToGlobalIfAvailable(S))
293 void *ExecutionEngine::getPointerToGlobalIfAvailable(const GlobalValue *GV) {
294 MutexGuard locked(lock);
295 return getPointerToGlobalIfAvailable(getMangledName(GV));
298 const GlobalValue *ExecutionEngine::getGlobalValueAtAddress(void *Addr) {
299 MutexGuard locked(lock);
301 // If we haven't computed the reverse mapping yet, do so first.
302 if (EEState.getGlobalAddressReverseMap().empty()) {
303 for (ExecutionEngineState::GlobalAddressMapTy::iterator
304 I = EEState.getGlobalAddressMap().begin(),
305 E = EEState.getGlobalAddressMap().end(); I != E; ++I) {
306 StringRef Name = I->first();
307 uint64_t Addr = I->second;
308 EEState.getGlobalAddressReverseMap().insert(std::make_pair(
313 std::map<uint64_t, std::string>::iterator I =
314 EEState.getGlobalAddressReverseMap().find((uint64_t) Addr);
316 if (I != EEState.getGlobalAddressReverseMap().end()) {
317 StringRef Name = I->second;
318 for (unsigned i = 0, e = Modules.size(); i != e; ++i)
319 if (GlobalValue *GV = Modules[i]->getNamedValue(Name))
327 std::unique_ptr<char[]> Array;
328 std::vector<std::unique_ptr<char[]>> Values;
330 /// Turn a vector of strings into a nice argv style array of pointers to null
331 /// terminated strings.
332 void *reset(LLVMContext &C, ExecutionEngine *EE,
333 const std::vector<std::string> &InputArgv);
335 } // anonymous namespace
336 void *ArgvArray::reset(LLVMContext &C, ExecutionEngine *EE,
337 const std::vector<std::string> &InputArgv) {
338 Values.clear(); // Free the old contents.
339 Values.reserve(InputArgv.size());
340 unsigned PtrSize = EE->getDataLayout().getPointerSize();
341 Array = make_unique<char[]>((InputArgv.size()+1)*PtrSize);
343 DEBUG(dbgs() << "JIT: ARGV = " << (void*)Array.get() << "\n");
344 Type *SBytePtr = Type::getInt8PtrTy(C);
346 for (unsigned i = 0; i != InputArgv.size(); ++i) {
347 unsigned Size = InputArgv[i].size()+1;
348 auto Dest = make_unique<char[]>(Size);
349 DEBUG(dbgs() << "JIT: ARGV[" << i << "] = " << (void*)Dest.get() << "\n");
351 std::copy(InputArgv[i].begin(), InputArgv[i].end(), Dest.get());
354 // Endian safe: Array[i] = (PointerTy)Dest;
355 EE->StoreValueToMemory(PTOGV(Dest.get()),
356 (GenericValue*)(&Array[i*PtrSize]), SBytePtr);
357 Values.push_back(std::move(Dest));
361 EE->StoreValueToMemory(PTOGV(nullptr),
362 (GenericValue*)(&Array[InputArgv.size()*PtrSize]),
367 void ExecutionEngine::runStaticConstructorsDestructors(Module &module,
369 const char *Name = isDtors ? "llvm.global_dtors" : "llvm.global_ctors";
370 GlobalVariable *GV = module.getNamedGlobal(Name);
372 // If this global has internal linkage, or if it has a use, then it must be
373 // an old-style (llvmgcc3) static ctor with __main linked in and in use. If
374 // this is the case, don't execute any of the global ctors, __main will do
376 if (!GV || GV->isDeclaration() || GV->hasLocalLinkage()) return;
378 // Should be an array of '{ i32, void ()* }' structs. The first value is
379 // the init priority, which we ignore.
380 ConstantArray *InitList = dyn_cast<ConstantArray>(GV->getInitializer());
383 for (unsigned i = 0, e = InitList->getNumOperands(); i != e; ++i) {
384 ConstantStruct *CS = dyn_cast<ConstantStruct>(InitList->getOperand(i));
387 Constant *FP = CS->getOperand(1);
388 if (FP->isNullValue())
389 continue; // Found a sentinal value, ignore.
391 // Strip off constant expression casts.
392 if (ConstantExpr *CE = dyn_cast<ConstantExpr>(FP))
394 FP = CE->getOperand(0);
396 // Execute the ctor/dtor function!
397 if (Function *F = dyn_cast<Function>(FP))
398 runFunction(F, None);
400 // FIXME: It is marginally lame that we just do nothing here if we see an
401 // entry we don't recognize. It might not be unreasonable for the verifier
402 // to not even allow this and just assert here.
406 void ExecutionEngine::runStaticConstructorsDestructors(bool isDtors) {
407 // Execute global ctors/dtors for each module in the program.
408 for (std::unique_ptr<Module> &M : Modules)
409 runStaticConstructorsDestructors(*M, isDtors);
413 /// isTargetNullPtr - Return whether the target pointer stored at Loc is null.
414 static bool isTargetNullPtr(ExecutionEngine *EE, void *Loc) {
415 unsigned PtrSize = EE->getDataLayout().getPointerSize();
416 for (unsigned i = 0; i < PtrSize; ++i)
417 if (*(i + (uint8_t*)Loc))
423 int ExecutionEngine::runFunctionAsMain(Function *Fn,
424 const std::vector<std::string> &argv,
425 const char * const * envp) {
426 std::vector<GenericValue> GVArgs;
428 GVArgc.IntVal = APInt(32, argv.size());
431 unsigned NumArgs = Fn->getFunctionType()->getNumParams();
432 FunctionType *FTy = Fn->getFunctionType();
433 Type* PPInt8Ty = Type::getInt8PtrTy(Fn->getContext())->getPointerTo();
435 // Check the argument types.
437 report_fatal_error("Invalid number of arguments of main() supplied");
438 if (NumArgs >= 3 && FTy->getParamType(2) != PPInt8Ty)
439 report_fatal_error("Invalid type for third argument of main() supplied");
440 if (NumArgs >= 2 && FTy->getParamType(1) != PPInt8Ty)
441 report_fatal_error("Invalid type for second argument of main() supplied");
442 if (NumArgs >= 1 && !FTy->getParamType(0)->isIntegerTy(32))
443 report_fatal_error("Invalid type for first argument of main() supplied");
444 if (!FTy->getReturnType()->isIntegerTy() &&
445 !FTy->getReturnType()->isVoidTy())
446 report_fatal_error("Invalid return type of main() supplied");
451 GVArgs.push_back(GVArgc); // Arg #0 = argc.
454 GVArgs.push_back(PTOGV(CArgv.reset(Fn->getContext(), this, argv)));
455 assert(!isTargetNullPtr(this, GVTOP(GVArgs[1])) &&
456 "argv[0] was null after CreateArgv");
458 std::vector<std::string> EnvVars;
459 for (unsigned i = 0; envp[i]; ++i)
460 EnvVars.emplace_back(envp[i]);
462 GVArgs.push_back(PTOGV(CEnv.reset(Fn->getContext(), this, EnvVars)));
467 return runFunction(Fn, GVArgs).IntVal.getZExtValue();
470 EngineBuilder::EngineBuilder() : EngineBuilder(nullptr) {}
472 EngineBuilder::EngineBuilder(std::unique_ptr<Module> M)
473 : M(std::move(M)), WhichEngine(EngineKind::Either), ErrorStr(nullptr),
474 OptLevel(CodeGenOpt::Default), MemMgr(nullptr), Resolver(nullptr),
475 CMModel(CodeModel::JITDefault), UseOrcMCJITReplacement(false) {
476 // IR module verification is enabled by default in debug builds, and disabled
477 // by default in release builds.
479 VerifyModules = true;
481 VerifyModules = false;
485 EngineBuilder::~EngineBuilder() = default;
487 EngineBuilder &EngineBuilder::setMCJITMemoryManager(
488 std::unique_ptr<RTDyldMemoryManager> mcjmm) {
489 auto SharedMM = std::shared_ptr<RTDyldMemoryManager>(std::move(mcjmm));
496 EngineBuilder::setMemoryManager(std::unique_ptr<MCJITMemoryManager> MM) {
497 MemMgr = std::shared_ptr<MCJITMemoryManager>(std::move(MM));
502 EngineBuilder::setSymbolResolver(std::unique_ptr<RuntimeDyld::SymbolResolver> SR) {
503 Resolver = std::shared_ptr<RuntimeDyld::SymbolResolver>(std::move(SR));
507 ExecutionEngine *EngineBuilder::create(TargetMachine *TM) {
508 std::unique_ptr<TargetMachine> TheTM(TM); // Take ownership.
510 // Make sure we can resolve symbols in the program as well. The zero arg
511 // to the function tells DynamicLibrary to load the program, not a library.
512 if (sys::DynamicLibrary::LoadLibraryPermanently(nullptr, ErrorStr))
515 // If the user specified a memory manager but didn't specify which engine to
516 // create, we assume they only want the JIT, and we fail if they only want
519 if (WhichEngine & EngineKind::JIT)
520 WhichEngine = EngineKind::JIT;
523 *ErrorStr = "Cannot create an interpreter with a memory manager.";
528 // Unless the interpreter was explicitly selected or the JIT is not linked,
530 if ((WhichEngine & EngineKind::JIT) && TheTM) {
531 Triple TT(M->getTargetTriple());
532 if (!TM->getTarget().hasJIT()) {
533 errs() << "WARNING: This target JIT is not designed for the host"
534 << " you are running. If bad things happen, please choose"
535 << " a different -march switch.\n";
538 ExecutionEngine *EE = nullptr;
539 if (ExecutionEngine::OrcMCJITReplacementCtor && UseOrcMCJITReplacement) {
540 EE = ExecutionEngine::OrcMCJITReplacementCtor(ErrorStr, std::move(MemMgr),
543 EE->addModule(std::move(M));
544 } else if (ExecutionEngine::MCJITCtor)
545 EE = ExecutionEngine::MCJITCtor(std::move(M), ErrorStr, std::move(MemMgr),
546 std::move(Resolver), std::move(TheTM));
549 EE->setVerifyModules(VerifyModules);
554 // If we can't make a JIT and we didn't request one specifically, try making
555 // an interpreter instead.
556 if (WhichEngine & EngineKind::Interpreter) {
557 if (ExecutionEngine::InterpCtor)
558 return ExecutionEngine::InterpCtor(std::move(M), ErrorStr);
560 *ErrorStr = "Interpreter has not been linked in.";
564 if ((WhichEngine & EngineKind::JIT) && !ExecutionEngine::MCJITCtor) {
566 *ErrorStr = "JIT has not been linked in.";
572 void *ExecutionEngine::getPointerToGlobal(const GlobalValue *GV) {
573 if (Function *F = const_cast<Function*>(dyn_cast<Function>(GV)))
574 return getPointerToFunction(F);
576 MutexGuard locked(lock);
577 if (void* P = getPointerToGlobalIfAvailable(GV))
580 // Global variable might have been added since interpreter started.
581 if (GlobalVariable *GVar =
582 const_cast<GlobalVariable *>(dyn_cast<GlobalVariable>(GV)))
583 EmitGlobalVariable(GVar);
585 llvm_unreachable("Global hasn't had an address allocated yet!");
587 return getPointerToGlobalIfAvailable(GV);
590 /// \brief Converts a Constant* into a GenericValue, including handling of
591 /// ConstantExpr values.
592 GenericValue ExecutionEngine::getConstantValue(const Constant *C) {
593 // If its undefined, return the garbage.
594 if (isa<UndefValue>(C)) {
596 switch (C->getType()->getTypeID()) {
599 case Type::IntegerTyID:
600 case Type::X86_FP80TyID:
601 case Type::FP128TyID:
602 case Type::PPC_FP128TyID:
603 // Although the value is undefined, we still have to construct an APInt
604 // with the correct bit width.
605 Result.IntVal = APInt(C->getType()->getPrimitiveSizeInBits(), 0);
607 case Type::StructTyID: {
608 // if the whole struct is 'undef' just reserve memory for the value.
609 if(StructType *STy = dyn_cast<StructType>(C->getType())) {
610 unsigned int elemNum = STy->getNumElements();
611 Result.AggregateVal.resize(elemNum);
612 for (unsigned int i = 0; i < elemNum; ++i) {
613 Type *ElemTy = STy->getElementType(i);
614 if (ElemTy->isIntegerTy())
615 Result.AggregateVal[i].IntVal =
616 APInt(ElemTy->getPrimitiveSizeInBits(), 0);
617 else if (ElemTy->isAggregateType()) {
618 const Constant *ElemUndef = UndefValue::get(ElemTy);
619 Result.AggregateVal[i] = getConstantValue(ElemUndef);
625 case Type::VectorTyID:
626 // if the whole vector is 'undef' just reserve memory for the value.
627 auto* VTy = dyn_cast<VectorType>(C->getType());
628 Type *ElemTy = VTy->getElementType();
629 unsigned int elemNum = VTy->getNumElements();
630 Result.AggregateVal.resize(elemNum);
631 if (ElemTy->isIntegerTy())
632 for (unsigned int i = 0; i < elemNum; ++i)
633 Result.AggregateVal[i].IntVal =
634 APInt(ElemTy->getPrimitiveSizeInBits(), 0);
640 // Otherwise, if the value is a ConstantExpr...
641 if (const ConstantExpr *CE = dyn_cast<ConstantExpr>(C)) {
642 Constant *Op0 = CE->getOperand(0);
643 switch (CE->getOpcode()) {
644 case Instruction::GetElementPtr: {
646 GenericValue Result = getConstantValue(Op0);
647 APInt Offset(DL.getPointerSizeInBits(), 0);
648 cast<GEPOperator>(CE)->accumulateConstantOffset(DL, Offset);
650 char* tmp = (char*) Result.PointerVal;
651 Result = PTOGV(tmp + Offset.getSExtValue());
654 case Instruction::Trunc: {
655 GenericValue GV = getConstantValue(Op0);
656 uint32_t BitWidth = cast<IntegerType>(CE->getType())->getBitWidth();
657 GV.IntVal = GV.IntVal.trunc(BitWidth);
660 case Instruction::ZExt: {
661 GenericValue GV = getConstantValue(Op0);
662 uint32_t BitWidth = cast<IntegerType>(CE->getType())->getBitWidth();
663 GV.IntVal = GV.IntVal.zext(BitWidth);
666 case Instruction::SExt: {
667 GenericValue GV = getConstantValue(Op0);
668 uint32_t BitWidth = cast<IntegerType>(CE->getType())->getBitWidth();
669 GV.IntVal = GV.IntVal.sext(BitWidth);
672 case Instruction::FPTrunc: {
674 GenericValue GV = getConstantValue(Op0);
675 GV.FloatVal = float(GV.DoubleVal);
678 case Instruction::FPExt:{
680 GenericValue GV = getConstantValue(Op0);
681 GV.DoubleVal = double(GV.FloatVal);
684 case Instruction::UIToFP: {
685 GenericValue GV = getConstantValue(Op0);
686 if (CE->getType()->isFloatTy())
687 GV.FloatVal = float(GV.IntVal.roundToDouble());
688 else if (CE->getType()->isDoubleTy())
689 GV.DoubleVal = GV.IntVal.roundToDouble();
690 else if (CE->getType()->isX86_FP80Ty()) {
691 APFloat apf = APFloat::getZero(APFloat::x87DoubleExtended);
692 (void)apf.convertFromAPInt(GV.IntVal,
694 APFloat::rmNearestTiesToEven);
695 GV.IntVal = apf.bitcastToAPInt();
699 case Instruction::SIToFP: {
700 GenericValue GV = getConstantValue(Op0);
701 if (CE->getType()->isFloatTy())
702 GV.FloatVal = float(GV.IntVal.signedRoundToDouble());
703 else if (CE->getType()->isDoubleTy())
704 GV.DoubleVal = GV.IntVal.signedRoundToDouble();
705 else if (CE->getType()->isX86_FP80Ty()) {
706 APFloat apf = APFloat::getZero(APFloat::x87DoubleExtended);
707 (void)apf.convertFromAPInt(GV.IntVal,
709 APFloat::rmNearestTiesToEven);
710 GV.IntVal = apf.bitcastToAPInt();
714 case Instruction::FPToUI: // double->APInt conversion handles sign
715 case Instruction::FPToSI: {
716 GenericValue GV = getConstantValue(Op0);
717 uint32_t BitWidth = cast<IntegerType>(CE->getType())->getBitWidth();
718 if (Op0->getType()->isFloatTy())
719 GV.IntVal = APIntOps::RoundFloatToAPInt(GV.FloatVal, BitWidth);
720 else if (Op0->getType()->isDoubleTy())
721 GV.IntVal = APIntOps::RoundDoubleToAPInt(GV.DoubleVal, BitWidth);
722 else if (Op0->getType()->isX86_FP80Ty()) {
723 APFloat apf = APFloat(APFloat::x87DoubleExtended, GV.IntVal);
726 (void)apf.convertToInteger(&v, BitWidth,
727 CE->getOpcode()==Instruction::FPToSI,
728 APFloat::rmTowardZero, &ignored);
729 GV.IntVal = v; // endian?
733 case Instruction::PtrToInt: {
734 GenericValue GV = getConstantValue(Op0);
735 uint32_t PtrWidth = DL.getTypeSizeInBits(Op0->getType());
736 assert(PtrWidth <= 64 && "Bad pointer width");
737 GV.IntVal = APInt(PtrWidth, uintptr_t(GV.PointerVal));
738 uint32_t IntWidth = DL.getTypeSizeInBits(CE->getType());
739 GV.IntVal = GV.IntVal.zextOrTrunc(IntWidth);
742 case Instruction::IntToPtr: {
743 GenericValue GV = getConstantValue(Op0);
744 uint32_t PtrWidth = DL.getTypeSizeInBits(CE->getType());
745 GV.IntVal = GV.IntVal.zextOrTrunc(PtrWidth);
746 assert(GV.IntVal.getBitWidth() <= 64 && "Bad pointer width");
747 GV.PointerVal = PointerTy(uintptr_t(GV.IntVal.getZExtValue()));
750 case Instruction::BitCast: {
751 GenericValue GV = getConstantValue(Op0);
752 Type* DestTy = CE->getType();
753 switch (Op0->getType()->getTypeID()) {
754 default: llvm_unreachable("Invalid bitcast operand");
755 case Type::IntegerTyID:
756 assert(DestTy->isFloatingPointTy() && "invalid bitcast");
757 if (DestTy->isFloatTy())
758 GV.FloatVal = GV.IntVal.bitsToFloat();
759 else if (DestTy->isDoubleTy())
760 GV.DoubleVal = GV.IntVal.bitsToDouble();
762 case Type::FloatTyID:
763 assert(DestTy->isIntegerTy(32) && "Invalid bitcast");
764 GV.IntVal = APInt::floatToBits(GV.FloatVal);
766 case Type::DoubleTyID:
767 assert(DestTy->isIntegerTy(64) && "Invalid bitcast");
768 GV.IntVal = APInt::doubleToBits(GV.DoubleVal);
770 case Type::PointerTyID:
771 assert(DestTy->isPointerTy() && "Invalid bitcast");
772 break; // getConstantValue(Op0) above already converted it
776 case Instruction::Add:
777 case Instruction::FAdd:
778 case Instruction::Sub:
779 case Instruction::FSub:
780 case Instruction::Mul:
781 case Instruction::FMul:
782 case Instruction::UDiv:
783 case Instruction::SDiv:
784 case Instruction::URem:
785 case Instruction::SRem:
786 case Instruction::And:
787 case Instruction::Or:
788 case Instruction::Xor: {
789 GenericValue LHS = getConstantValue(Op0);
790 GenericValue RHS = getConstantValue(CE->getOperand(1));
792 switch (CE->getOperand(0)->getType()->getTypeID()) {
793 default: llvm_unreachable("Bad add type!");
794 case Type::IntegerTyID:
795 switch (CE->getOpcode()) {
796 default: llvm_unreachable("Invalid integer opcode");
797 case Instruction::Add: GV.IntVal = LHS.IntVal + RHS.IntVal; break;
798 case Instruction::Sub: GV.IntVal = LHS.IntVal - RHS.IntVal; break;
799 case Instruction::Mul: GV.IntVal = LHS.IntVal * RHS.IntVal; break;
800 case Instruction::UDiv:GV.IntVal = LHS.IntVal.udiv(RHS.IntVal); break;
801 case Instruction::SDiv:GV.IntVal = LHS.IntVal.sdiv(RHS.IntVal); break;
802 case Instruction::URem:GV.IntVal = LHS.IntVal.urem(RHS.IntVal); break;
803 case Instruction::SRem:GV.IntVal = LHS.IntVal.srem(RHS.IntVal); break;
804 case Instruction::And: GV.IntVal = LHS.IntVal & RHS.IntVal; break;
805 case Instruction::Or: GV.IntVal = LHS.IntVal | RHS.IntVal; break;
806 case Instruction::Xor: GV.IntVal = LHS.IntVal ^ RHS.IntVal; break;
809 case Type::FloatTyID:
810 switch (CE->getOpcode()) {
811 default: llvm_unreachable("Invalid float opcode");
812 case Instruction::FAdd:
813 GV.FloatVal = LHS.FloatVal + RHS.FloatVal; break;
814 case Instruction::FSub:
815 GV.FloatVal = LHS.FloatVal - RHS.FloatVal; break;
816 case Instruction::FMul:
817 GV.FloatVal = LHS.FloatVal * RHS.FloatVal; break;
818 case Instruction::FDiv:
819 GV.FloatVal = LHS.FloatVal / RHS.FloatVal; break;
820 case Instruction::FRem:
821 GV.FloatVal = std::fmod(LHS.FloatVal,RHS.FloatVal); break;
824 case Type::DoubleTyID:
825 switch (CE->getOpcode()) {
826 default: llvm_unreachable("Invalid double opcode");
827 case Instruction::FAdd:
828 GV.DoubleVal = LHS.DoubleVal + RHS.DoubleVal; break;
829 case Instruction::FSub:
830 GV.DoubleVal = LHS.DoubleVal - RHS.DoubleVal; break;
831 case Instruction::FMul:
832 GV.DoubleVal = LHS.DoubleVal * RHS.DoubleVal; break;
833 case Instruction::FDiv:
834 GV.DoubleVal = LHS.DoubleVal / RHS.DoubleVal; break;
835 case Instruction::FRem:
836 GV.DoubleVal = std::fmod(LHS.DoubleVal,RHS.DoubleVal); break;
839 case Type::X86_FP80TyID:
840 case Type::PPC_FP128TyID:
841 case Type::FP128TyID: {
842 const fltSemantics &Sem = CE->getOperand(0)->getType()->getFltSemantics();
843 APFloat apfLHS = APFloat(Sem, LHS.IntVal);
844 switch (CE->getOpcode()) {
845 default: llvm_unreachable("Invalid long double opcode");
846 case Instruction::FAdd:
847 apfLHS.add(APFloat(Sem, RHS.IntVal), APFloat::rmNearestTiesToEven);
848 GV.IntVal = apfLHS.bitcastToAPInt();
850 case Instruction::FSub:
851 apfLHS.subtract(APFloat(Sem, RHS.IntVal),
852 APFloat::rmNearestTiesToEven);
853 GV.IntVal = apfLHS.bitcastToAPInt();
855 case Instruction::FMul:
856 apfLHS.multiply(APFloat(Sem, RHS.IntVal),
857 APFloat::rmNearestTiesToEven);
858 GV.IntVal = apfLHS.bitcastToAPInt();
860 case Instruction::FDiv:
861 apfLHS.divide(APFloat(Sem, RHS.IntVal),
862 APFloat::rmNearestTiesToEven);
863 GV.IntVal = apfLHS.bitcastToAPInt();
865 case Instruction::FRem:
866 apfLHS.mod(APFloat(Sem, RHS.IntVal));
867 GV.IntVal = apfLHS.bitcastToAPInt();
879 SmallString<256> Msg;
880 raw_svector_ostream OS(Msg);
881 OS << "ConstantExpr not handled: " << *CE;
882 report_fatal_error(OS.str());
885 // Otherwise, we have a simple constant.
887 switch (C->getType()->getTypeID()) {
888 case Type::FloatTyID:
889 Result.FloatVal = cast<ConstantFP>(C)->getValueAPF().convertToFloat();
891 case Type::DoubleTyID:
892 Result.DoubleVal = cast<ConstantFP>(C)->getValueAPF().convertToDouble();
894 case Type::X86_FP80TyID:
895 case Type::FP128TyID:
896 case Type::PPC_FP128TyID:
897 Result.IntVal = cast <ConstantFP>(C)->getValueAPF().bitcastToAPInt();
899 case Type::IntegerTyID:
900 Result.IntVal = cast<ConstantInt>(C)->getValue();
902 case Type::PointerTyID:
903 if (isa<ConstantPointerNull>(C))
904 Result.PointerVal = nullptr;
905 else if (const Function *F = dyn_cast<Function>(C))
906 Result = PTOGV(getPointerToFunctionOrStub(const_cast<Function*>(F)));
907 else if (const GlobalVariable *GV = dyn_cast<GlobalVariable>(C))
908 Result = PTOGV(getOrEmitGlobalVariable(const_cast<GlobalVariable*>(GV)));
910 llvm_unreachable("Unknown constant pointer type!");
912 case Type::VectorTyID: {
915 const ConstantDataVector *CDV = dyn_cast<ConstantDataVector>(C);
916 const ConstantVector *CV = dyn_cast<ConstantVector>(C);
917 const ConstantAggregateZero *CAZ = dyn_cast<ConstantAggregateZero>(C);
920 elemNum = CDV->getNumElements();
921 ElemTy = CDV->getElementType();
922 } else if (CV || CAZ) {
923 VectorType* VTy = dyn_cast<VectorType>(C->getType());
924 elemNum = VTy->getNumElements();
925 ElemTy = VTy->getElementType();
927 llvm_unreachable("Unknown constant vector type!");
930 Result.AggregateVal.resize(elemNum);
931 // Check if vector holds floats.
932 if(ElemTy->isFloatTy()) {
934 GenericValue floatZero;
935 floatZero.FloatVal = 0.f;
936 std::fill(Result.AggregateVal.begin(), Result.AggregateVal.end(),
941 for (unsigned i = 0; i < elemNum; ++i)
942 if (!isa<UndefValue>(CV->getOperand(i)))
943 Result.AggregateVal[i].FloatVal = cast<ConstantFP>(
944 CV->getOperand(i))->getValueAPF().convertToFloat();
948 for (unsigned i = 0; i < elemNum; ++i)
949 Result.AggregateVal[i].FloatVal = CDV->getElementAsFloat(i);
953 // Check if vector holds doubles.
954 if (ElemTy->isDoubleTy()) {
956 GenericValue doubleZero;
957 doubleZero.DoubleVal = 0.0;
958 std::fill(Result.AggregateVal.begin(), Result.AggregateVal.end(),
963 for (unsigned i = 0; i < elemNum; ++i)
964 if (!isa<UndefValue>(CV->getOperand(i)))
965 Result.AggregateVal[i].DoubleVal = cast<ConstantFP>(
966 CV->getOperand(i))->getValueAPF().convertToDouble();
970 for (unsigned i = 0; i < elemNum; ++i)
971 Result.AggregateVal[i].DoubleVal = CDV->getElementAsDouble(i);
975 // Check if vector holds integers.
976 if (ElemTy->isIntegerTy()) {
978 GenericValue intZero;
979 intZero.IntVal = APInt(ElemTy->getScalarSizeInBits(), 0ull);
980 std::fill(Result.AggregateVal.begin(), Result.AggregateVal.end(),
985 for (unsigned i = 0; i < elemNum; ++i)
986 if (!isa<UndefValue>(CV->getOperand(i)))
987 Result.AggregateVal[i].IntVal = cast<ConstantInt>(
988 CV->getOperand(i))->getValue();
990 Result.AggregateVal[i].IntVal =
991 APInt(CV->getOperand(i)->getType()->getPrimitiveSizeInBits(), 0);
996 for (unsigned i = 0; i < elemNum; ++i)
997 Result.AggregateVal[i].IntVal = APInt(
998 CDV->getElementType()->getPrimitiveSizeInBits(),
999 CDV->getElementAsInteger(i));
1003 llvm_unreachable("Unknown constant pointer type!");
1008 SmallString<256> Msg;
1009 raw_svector_ostream OS(Msg);
1010 OS << "ERROR: Constant unimplemented for type: " << *C->getType();
1011 report_fatal_error(OS.str());
1017 /// StoreIntToMemory - Fills the StoreBytes bytes of memory starting from Dst
1018 /// with the integer held in IntVal.
1019 static void StoreIntToMemory(const APInt &IntVal, uint8_t *Dst,
1020 unsigned StoreBytes) {
1021 assert((IntVal.getBitWidth()+7)/8 >= StoreBytes && "Integer too small!");
1022 const uint8_t *Src = (const uint8_t *)IntVal.getRawData();
1024 if (sys::IsLittleEndianHost) {
1025 // Little-endian host - the source is ordered from LSB to MSB. Order the
1026 // destination from LSB to MSB: Do a straight copy.
1027 memcpy(Dst, Src, StoreBytes);
1029 // Big-endian host - the source is an array of 64 bit words ordered from
1030 // LSW to MSW. Each word is ordered from MSB to LSB. Order the destination
1031 // from MSB to LSB: Reverse the word order, but not the bytes in a word.
1032 while (StoreBytes > sizeof(uint64_t)) {
1033 StoreBytes -= sizeof(uint64_t);
1034 // May not be aligned so use memcpy.
1035 memcpy(Dst + StoreBytes, Src, sizeof(uint64_t));
1036 Src += sizeof(uint64_t);
1039 memcpy(Dst, Src + sizeof(uint64_t) - StoreBytes, StoreBytes);
1043 void ExecutionEngine::StoreValueToMemory(const GenericValue &Val,
1044 GenericValue *Ptr, Type *Ty) {
1045 const unsigned StoreBytes = getDataLayout().getTypeStoreSize(Ty);
1047 switch (Ty->getTypeID()) {
1049 dbgs() << "Cannot store value of type " << *Ty << "!\n";
1051 case Type::IntegerTyID:
1052 StoreIntToMemory(Val.IntVal, (uint8_t*)Ptr, StoreBytes);
1054 case Type::FloatTyID:
1055 *((float*)Ptr) = Val.FloatVal;
1057 case Type::DoubleTyID:
1058 *((double*)Ptr) = Val.DoubleVal;
1060 case Type::X86_FP80TyID:
1061 memcpy(Ptr, Val.IntVal.getRawData(), 10);
1063 case Type::PointerTyID:
1064 // Ensure 64 bit target pointers are fully initialized on 32 bit hosts.
1065 if (StoreBytes != sizeof(PointerTy))
1066 memset(&(Ptr->PointerVal), 0, StoreBytes);
1068 *((PointerTy*)Ptr) = Val.PointerVal;
1070 case Type::VectorTyID:
1071 for (unsigned i = 0; i < Val.AggregateVal.size(); ++i) {
1072 if (cast<VectorType>(Ty)->getElementType()->isDoubleTy())
1073 *(((double*)Ptr)+i) = Val.AggregateVal[i].DoubleVal;
1074 if (cast<VectorType>(Ty)->getElementType()->isFloatTy())
1075 *(((float*)Ptr)+i) = Val.AggregateVal[i].FloatVal;
1076 if (cast<VectorType>(Ty)->getElementType()->isIntegerTy()) {
1077 unsigned numOfBytes =(Val.AggregateVal[i].IntVal.getBitWidth()+7)/8;
1078 StoreIntToMemory(Val.AggregateVal[i].IntVal,
1079 (uint8_t*)Ptr + numOfBytes*i, numOfBytes);
1085 if (sys::IsLittleEndianHost != getDataLayout().isLittleEndian())
1086 // Host and target are different endian - reverse the stored bytes.
1087 std::reverse((uint8_t*)Ptr, StoreBytes + (uint8_t*)Ptr);
1090 /// LoadIntFromMemory - Loads the integer stored in the LoadBytes bytes starting
1091 /// from Src into IntVal, which is assumed to be wide enough and to hold zero.
1092 static void LoadIntFromMemory(APInt &IntVal, uint8_t *Src, unsigned LoadBytes) {
1093 assert((IntVal.getBitWidth()+7)/8 >= LoadBytes && "Integer too small!");
1094 uint8_t *Dst = reinterpret_cast<uint8_t *>(
1095 const_cast<uint64_t *>(IntVal.getRawData()));
1097 if (sys::IsLittleEndianHost)
1098 // Little-endian host - the destination must be ordered from LSB to MSB.
1099 // The source is ordered from LSB to MSB: Do a straight copy.
1100 memcpy(Dst, Src, LoadBytes);
1102 // Big-endian - the destination is an array of 64 bit words ordered from
1103 // LSW to MSW. Each word must be ordered from MSB to LSB. The source is
1104 // ordered from MSB to LSB: Reverse the word order, but not the bytes in
1106 while (LoadBytes > sizeof(uint64_t)) {
1107 LoadBytes -= sizeof(uint64_t);
1108 // May not be aligned so use memcpy.
1109 memcpy(Dst, Src + LoadBytes, sizeof(uint64_t));
1110 Dst += sizeof(uint64_t);
1113 memcpy(Dst + sizeof(uint64_t) - LoadBytes, Src, LoadBytes);
1119 void ExecutionEngine::LoadValueFromMemory(GenericValue &Result,
1122 const unsigned LoadBytes = getDataLayout().getTypeStoreSize(Ty);
1124 switch (Ty->getTypeID()) {
1125 case Type::IntegerTyID:
1126 // An APInt with all words initially zero.
1127 Result.IntVal = APInt(cast<IntegerType>(Ty)->getBitWidth(), 0);
1128 LoadIntFromMemory(Result.IntVal, (uint8_t*)Ptr, LoadBytes);
1130 case Type::FloatTyID:
1131 Result.FloatVal = *((float*)Ptr);
1133 case Type::DoubleTyID:
1134 Result.DoubleVal = *((double*)Ptr);
1136 case Type::PointerTyID:
1137 Result.PointerVal = *((PointerTy*)Ptr);
1139 case Type::X86_FP80TyID: {
1140 // This is endian dependent, but it will only work on x86 anyway.
1141 // FIXME: Will not trap if loading a signaling NaN.
1144 Result.IntVal = APInt(80, y);
1147 case Type::VectorTyID: {
1148 auto *VT = cast<VectorType>(Ty);
1149 Type *ElemT = VT->getElementType();
1150 const unsigned numElems = VT->getNumElements();
1151 if (ElemT->isFloatTy()) {
1152 Result.AggregateVal.resize(numElems);
1153 for (unsigned i = 0; i < numElems; ++i)
1154 Result.AggregateVal[i].FloatVal = *((float*)Ptr+i);
1156 if (ElemT->isDoubleTy()) {
1157 Result.AggregateVal.resize(numElems);
1158 for (unsigned i = 0; i < numElems; ++i)
1159 Result.AggregateVal[i].DoubleVal = *((double*)Ptr+i);
1161 if (ElemT->isIntegerTy()) {
1162 GenericValue intZero;
1163 const unsigned elemBitWidth = cast<IntegerType>(ElemT)->getBitWidth();
1164 intZero.IntVal = APInt(elemBitWidth, 0);
1165 Result.AggregateVal.resize(numElems, intZero);
1166 for (unsigned i = 0; i < numElems; ++i)
1167 LoadIntFromMemory(Result.AggregateVal[i].IntVal,
1168 (uint8_t*)Ptr+((elemBitWidth+7)/8)*i, (elemBitWidth+7)/8);
1173 SmallString<256> Msg;
1174 raw_svector_ostream OS(Msg);
1175 OS << "Cannot load value of type " << *Ty << "!";
1176 report_fatal_error(OS.str());
1180 void ExecutionEngine::InitializeMemory(const Constant *Init, void *Addr) {
1181 DEBUG(dbgs() << "JIT: Initializing " << Addr << " ");
1182 DEBUG(Init->dump());
1183 if (isa<UndefValue>(Init))
1186 if (const ConstantVector *CP = dyn_cast<ConstantVector>(Init)) {
1187 unsigned ElementSize =
1188 getDataLayout().getTypeAllocSize(CP->getType()->getElementType());
1189 for (unsigned i = 0, e = CP->getNumOperands(); i != e; ++i)
1190 InitializeMemory(CP->getOperand(i), (char*)Addr+i*ElementSize);
1194 if (isa<ConstantAggregateZero>(Init)) {
1195 memset(Addr, 0, (size_t)getDataLayout().getTypeAllocSize(Init->getType()));
1199 if (const ConstantArray *CPA = dyn_cast<ConstantArray>(Init)) {
1200 unsigned ElementSize =
1201 getDataLayout().getTypeAllocSize(CPA->getType()->getElementType());
1202 for (unsigned i = 0, e = CPA->getNumOperands(); i != e; ++i)
1203 InitializeMemory(CPA->getOperand(i), (char*)Addr+i*ElementSize);
1207 if (const ConstantStruct *CPS = dyn_cast<ConstantStruct>(Init)) {
1208 const StructLayout *SL =
1209 getDataLayout().getStructLayout(cast<StructType>(CPS->getType()));
1210 for (unsigned i = 0, e = CPS->getNumOperands(); i != e; ++i)
1211 InitializeMemory(CPS->getOperand(i), (char*)Addr+SL->getElementOffset(i));
1215 if (const ConstantDataSequential *CDS =
1216 dyn_cast<ConstantDataSequential>(Init)) {
1217 // CDS is already laid out in host memory order.
1218 StringRef Data = CDS->getRawDataValues();
1219 memcpy(Addr, Data.data(), Data.size());
1223 if (Init->getType()->isFirstClassType()) {
1224 GenericValue Val = getConstantValue(Init);
1225 StoreValueToMemory(Val, (GenericValue*)Addr, Init->getType());
1229 DEBUG(dbgs() << "Bad Type: " << *Init->getType() << "\n");
1230 llvm_unreachable("Unknown constant type to initialize memory with!");
1233 /// EmitGlobals - Emit all of the global variables to memory, storing their
1234 /// addresses into GlobalAddress. This must make sure to copy the contents of
1235 /// their initializers into the memory.
1236 void ExecutionEngine::emitGlobals() {
1237 // Loop over all of the global variables in the program, allocating the memory
1238 // to hold them. If there is more than one module, do a prepass over globals
1239 // to figure out how the different modules should link together.
1240 std::map<std::pair<std::string, Type*>,
1241 const GlobalValue*> LinkedGlobalsMap;
1243 if (Modules.size() != 1) {
1244 for (unsigned m = 0, e = Modules.size(); m != e; ++m) {
1245 Module &M = *Modules[m];
1246 for (const auto &GV : M.globals()) {
1247 if (GV.hasLocalLinkage() || GV.isDeclaration() ||
1248 GV.hasAppendingLinkage() || !GV.hasName())
1249 continue;// Ignore external globals and globals with internal linkage.
1251 const GlobalValue *&GVEntry =
1252 LinkedGlobalsMap[std::make_pair(GV.getName(), GV.getType())];
1254 // If this is the first time we've seen this global, it is the canonical
1261 // If the existing global is strong, never replace it.
1262 if (GVEntry->hasExternalLinkage())
1265 // Otherwise, we know it's linkonce/weak, replace it if this is a strong
1266 // symbol. FIXME is this right for common?
1267 if (GV.hasExternalLinkage() || GVEntry->hasExternalWeakLinkage())
1273 std::vector<const GlobalValue*> NonCanonicalGlobals;
1274 for (unsigned m = 0, e = Modules.size(); m != e; ++m) {
1275 Module &M = *Modules[m];
1276 for (const auto &GV : M.globals()) {
1277 // In the multi-module case, see what this global maps to.
1278 if (!LinkedGlobalsMap.empty()) {
1279 if (const GlobalValue *GVEntry =
1280 LinkedGlobalsMap[std::make_pair(GV.getName(), GV.getType())]) {
1281 // If something else is the canonical global, ignore this one.
1282 if (GVEntry != &GV) {
1283 NonCanonicalGlobals.push_back(&GV);
1289 if (!GV.isDeclaration()) {
1290 addGlobalMapping(&GV, getMemoryForGV(&GV));
1292 // External variable reference. Try to use the dynamic loader to
1293 // get a pointer to it.
1295 sys::DynamicLibrary::SearchForAddressOfSymbol(GV.getName()))
1296 addGlobalMapping(&GV, SymAddr);
1298 report_fatal_error("Could not resolve external global address: "
1304 // If there are multiple modules, map the non-canonical globals to their
1305 // canonical location.
1306 if (!NonCanonicalGlobals.empty()) {
1307 for (unsigned i = 0, e = NonCanonicalGlobals.size(); i != e; ++i) {
1308 const GlobalValue *GV = NonCanonicalGlobals[i];
1309 const GlobalValue *CGV =
1310 LinkedGlobalsMap[std::make_pair(GV->getName(), GV->getType())];
1311 void *Ptr = getPointerToGlobalIfAvailable(CGV);
1312 assert(Ptr && "Canonical global wasn't codegen'd!");
1313 addGlobalMapping(GV, Ptr);
1317 // Now that all of the globals are set up in memory, loop through them all
1318 // and initialize their contents.
1319 for (const auto &GV : M.globals()) {
1320 if (!GV.isDeclaration()) {
1321 if (!LinkedGlobalsMap.empty()) {
1322 if (const GlobalValue *GVEntry =
1323 LinkedGlobalsMap[std::make_pair(GV.getName(), GV.getType())])
1324 if (GVEntry != &GV) // Not the canonical variable.
1327 EmitGlobalVariable(&GV);
1333 // EmitGlobalVariable - This method emits the specified global variable to the
1334 // address specified in GlobalAddresses, or allocates new memory if it's not
1335 // already in the map.
1336 void ExecutionEngine::EmitGlobalVariable(const GlobalVariable *GV) {
1337 void *GA = getPointerToGlobalIfAvailable(GV);
1340 // If it's not already specified, allocate memory for the global.
1341 GA = getMemoryForGV(GV);
1343 // If we failed to allocate memory for this global, return.
1346 addGlobalMapping(GV, GA);
1349 // Don't initialize if it's thread local, let the client do it.
1350 if (!GV->isThreadLocal())
1351 InitializeMemory(GV->getInitializer(), GA);
1353 Type *ElTy = GV->getValueType();
1354 size_t GVSize = (size_t)getDataLayout().getTypeAllocSize(ElTy);
1355 NumInitBytes += (unsigned)GVSize;