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 : 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 MutexGuard locked(lock);
194 SmallString<128> FullName;
195 Mang.getNameWithPrefix(FullName, GV, false);
196 return FullName.str();
199 void ExecutionEngine::addGlobalMapping(const GlobalValue *GV, void *Addr) {
200 MutexGuard locked(lock);
201 addGlobalMapping(getMangledName(GV), (uint64_t) Addr);
204 void ExecutionEngine::addGlobalMapping(StringRef Name, uint64_t Addr) {
205 MutexGuard locked(lock);
207 assert(!Name.empty() && "Empty GlobalMapping symbol name!");
209 DEBUG(dbgs() << "JIT: Map \'" << Name << "\' to [" << Addr << "]\n";);
210 uint64_t &CurVal = EEState.getGlobalAddressMap()[Name];
211 assert((!CurVal || !Addr) && "GlobalMapping already established!");
214 // If we are using the reverse mapping, add it too.
215 if (!EEState.getGlobalAddressReverseMap().empty()) {
216 std::string &V = EEState.getGlobalAddressReverseMap()[CurVal];
217 assert((!V.empty() || !Name.empty()) &&
218 "GlobalMapping already established!");
223 void ExecutionEngine::clearAllGlobalMappings() {
224 MutexGuard locked(lock);
226 EEState.getGlobalAddressMap().clear();
227 EEState.getGlobalAddressReverseMap().clear();
230 void ExecutionEngine::clearGlobalMappingsFromModule(Module *M) {
231 MutexGuard locked(lock);
233 for (Module::iterator FI = M->begin(), FE = M->end(); FI != FE; ++FI)
234 EEState.RemoveMapping(getMangledName(FI));
235 for (Module::global_iterator GI = M->global_begin(), GE = M->global_end();
237 EEState.RemoveMapping(getMangledName(GI));
240 uint64_t ExecutionEngine::updateGlobalMapping(const GlobalValue *GV,
242 MutexGuard locked(lock);
243 return updateGlobalMapping(getMangledName(GV), (uint64_t) Addr);
246 uint64_t ExecutionEngine::updateGlobalMapping(StringRef Name, uint64_t Addr) {
247 MutexGuard locked(lock);
249 ExecutionEngineState::GlobalAddressMapTy &Map =
250 EEState.getGlobalAddressMap();
252 // Deleting from the mapping?
254 return EEState.RemoveMapping(Name);
256 uint64_t &CurVal = Map[Name];
257 uint64_t OldVal = CurVal;
259 if (CurVal && !EEState.getGlobalAddressReverseMap().empty())
260 EEState.getGlobalAddressReverseMap().erase(CurVal);
263 // If we are using the reverse mapping, add it too.
264 if (!EEState.getGlobalAddressReverseMap().empty()) {
265 std::string &V = EEState.getGlobalAddressReverseMap()[CurVal];
266 assert((!V.empty() || !Name.empty()) &&
267 "GlobalMapping already established!");
273 uint64_t ExecutionEngine::getAddressToGlobalIfAvailable(StringRef S) {
274 MutexGuard locked(lock);
275 uint64_t Address = 0;
276 ExecutionEngineState::GlobalAddressMapTy::iterator I =
277 EEState.getGlobalAddressMap().find(S);
278 if (I != EEState.getGlobalAddressMap().end())
284 void *ExecutionEngine::getPointerToGlobalIfAvailable(StringRef S) {
285 MutexGuard locked(lock);
286 if (void* Address = (void *) getAddressToGlobalIfAvailable(S))
291 void *ExecutionEngine::getPointerToGlobalIfAvailable(const GlobalValue *GV) {
292 MutexGuard locked(lock);
293 return getPointerToGlobalIfAvailable(getMangledName(GV));
296 const GlobalValue *ExecutionEngine::getGlobalValueAtAddress(void *Addr) {
297 MutexGuard locked(lock);
299 // If we haven't computed the reverse mapping yet, do so first.
300 if (EEState.getGlobalAddressReverseMap().empty()) {
301 for (ExecutionEngineState::GlobalAddressMapTy::iterator
302 I = EEState.getGlobalAddressMap().begin(),
303 E = EEState.getGlobalAddressMap().end(); I != E; ++I) {
304 StringRef Name = I->first();
305 uint64_t Addr = I->second;
306 EEState.getGlobalAddressReverseMap().insert(std::make_pair(
311 std::map<uint64_t, std::string>::iterator I =
312 EEState.getGlobalAddressReverseMap().find((uint64_t) Addr);
314 if (I != EEState.getGlobalAddressReverseMap().end()) {
315 StringRef Name = I->second;
316 for (unsigned i = 0, e = Modules.size(); i != e; ++i)
317 if (GlobalValue *GV = Modules[i]->getNamedValue(Name))
325 std::unique_ptr<char[]> Array;
326 std::vector<std::unique_ptr<char[]>> Values;
328 /// Turn a vector of strings into a nice argv style array of pointers to null
329 /// terminated strings.
330 void *reset(LLVMContext &C, ExecutionEngine *EE,
331 const std::vector<std::string> &InputArgv);
333 } // anonymous namespace
334 void *ArgvArray::reset(LLVMContext &C, ExecutionEngine *EE,
335 const std::vector<std::string> &InputArgv) {
336 Values.clear(); // Free the old contents.
337 Values.reserve(InputArgv.size());
338 unsigned PtrSize = EE->getDataLayout().getPointerSize();
339 Array = make_unique<char[]>((InputArgv.size()+1)*PtrSize);
341 DEBUG(dbgs() << "JIT: ARGV = " << (void*)Array.get() << "\n");
342 Type *SBytePtr = Type::getInt8PtrTy(C);
344 for (unsigned i = 0; i != InputArgv.size(); ++i) {
345 unsigned Size = InputArgv[i].size()+1;
346 auto Dest = make_unique<char[]>(Size);
347 DEBUG(dbgs() << "JIT: ARGV[" << i << "] = " << (void*)Dest.get() << "\n");
349 std::copy(InputArgv[i].begin(), InputArgv[i].end(), Dest.get());
352 // Endian safe: Array[i] = (PointerTy)Dest;
353 EE->StoreValueToMemory(PTOGV(Dest.get()),
354 (GenericValue*)(&Array[i*PtrSize]), SBytePtr);
355 Values.push_back(std::move(Dest));
359 EE->StoreValueToMemory(PTOGV(nullptr),
360 (GenericValue*)(&Array[InputArgv.size()*PtrSize]),
365 void ExecutionEngine::runStaticConstructorsDestructors(Module &module,
367 const char *Name = isDtors ? "llvm.global_dtors" : "llvm.global_ctors";
368 GlobalVariable *GV = module.getNamedGlobal(Name);
370 // If this global has internal linkage, or if it has a use, then it must be
371 // an old-style (llvmgcc3) static ctor with __main linked in and in use. If
372 // this is the case, don't execute any of the global ctors, __main will do
374 if (!GV || GV->isDeclaration() || GV->hasLocalLinkage()) return;
376 // Should be an array of '{ i32, void ()* }' structs. The first value is
377 // the init priority, which we ignore.
378 ConstantArray *InitList = dyn_cast<ConstantArray>(GV->getInitializer());
381 for (unsigned i = 0, e = InitList->getNumOperands(); i != e; ++i) {
382 ConstantStruct *CS = dyn_cast<ConstantStruct>(InitList->getOperand(i));
385 Constant *FP = CS->getOperand(1);
386 if (FP->isNullValue())
387 continue; // Found a sentinal value, ignore.
389 // Strip off constant expression casts.
390 if (ConstantExpr *CE = dyn_cast<ConstantExpr>(FP))
392 FP = CE->getOperand(0);
394 // Execute the ctor/dtor function!
395 if (Function *F = dyn_cast<Function>(FP))
396 runFunction(F, None);
398 // FIXME: It is marginally lame that we just do nothing here if we see an
399 // entry we don't recognize. It might not be unreasonable for the verifier
400 // to not even allow this and just assert here.
404 void ExecutionEngine::runStaticConstructorsDestructors(bool isDtors) {
405 // Execute global ctors/dtors for each module in the program.
406 for (std::unique_ptr<Module> &M : Modules)
407 runStaticConstructorsDestructors(*M, isDtors);
411 /// isTargetNullPtr - Return whether the target pointer stored at Loc is null.
412 static bool isTargetNullPtr(ExecutionEngine *EE, void *Loc) {
413 unsigned PtrSize = EE->getDataLayout().getPointerSize();
414 for (unsigned i = 0; i < PtrSize; ++i)
415 if (*(i + (uint8_t*)Loc))
421 int ExecutionEngine::runFunctionAsMain(Function *Fn,
422 const std::vector<std::string> &argv,
423 const char * const * envp) {
424 std::vector<GenericValue> GVArgs;
426 GVArgc.IntVal = APInt(32, argv.size());
429 unsigned NumArgs = Fn->getFunctionType()->getNumParams();
430 FunctionType *FTy = Fn->getFunctionType();
431 Type* PPInt8Ty = Type::getInt8PtrTy(Fn->getContext())->getPointerTo();
433 // Check the argument types.
435 report_fatal_error("Invalid number of arguments of main() supplied");
436 if (NumArgs >= 3 && FTy->getParamType(2) != PPInt8Ty)
437 report_fatal_error("Invalid type for third argument of main() supplied");
438 if (NumArgs >= 2 && FTy->getParamType(1) != PPInt8Ty)
439 report_fatal_error("Invalid type for second argument of main() supplied");
440 if (NumArgs >= 1 && !FTy->getParamType(0)->isIntegerTy(32))
441 report_fatal_error("Invalid type for first argument of main() supplied");
442 if (!FTy->getReturnType()->isIntegerTy() &&
443 !FTy->getReturnType()->isVoidTy())
444 report_fatal_error("Invalid return type of main() supplied");
449 GVArgs.push_back(GVArgc); // Arg #0 = argc.
452 GVArgs.push_back(PTOGV(CArgv.reset(Fn->getContext(), this, argv)));
453 assert(!isTargetNullPtr(this, GVTOP(GVArgs[1])) &&
454 "argv[0] was null after CreateArgv");
456 std::vector<std::string> EnvVars;
457 for (unsigned i = 0; envp[i]; ++i)
458 EnvVars.emplace_back(envp[i]);
460 GVArgs.push_back(PTOGV(CEnv.reset(Fn->getContext(), this, EnvVars)));
465 return runFunction(Fn, GVArgs).IntVal.getZExtValue();
468 EngineBuilder::EngineBuilder() : EngineBuilder(nullptr) {}
470 EngineBuilder::EngineBuilder(std::unique_ptr<Module> M)
471 : M(std::move(M)), WhichEngine(EngineKind::Either), ErrorStr(nullptr),
472 OptLevel(CodeGenOpt::Default), MemMgr(nullptr), Resolver(nullptr),
473 RelocModel(Reloc::Default), CMModel(CodeModel::JITDefault),
474 UseOrcMCJITReplacement(false) {
475 // IR module verification is enabled by default in debug builds, and disabled
476 // by default in release builds.
478 VerifyModules = true;
480 VerifyModules = false;
484 EngineBuilder::~EngineBuilder() = default;
486 EngineBuilder &EngineBuilder::setMCJITMemoryManager(
487 std::unique_ptr<RTDyldMemoryManager> mcjmm) {
488 auto SharedMM = std::shared_ptr<RTDyldMemoryManager>(std::move(mcjmm));
495 EngineBuilder::setMemoryManager(std::unique_ptr<MCJITMemoryManager> MM) {
496 MemMgr = std::shared_ptr<MCJITMemoryManager>(std::move(MM));
501 EngineBuilder::setSymbolResolver(std::unique_ptr<RuntimeDyld::SymbolResolver> SR) {
502 Resolver = std::shared_ptr<RuntimeDyld::SymbolResolver>(std::move(SR));
506 ExecutionEngine *EngineBuilder::create(TargetMachine *TM) {
507 std::unique_ptr<TargetMachine> TheTM(TM); // Take ownership.
509 // Make sure we can resolve symbols in the program as well. The zero arg
510 // to the function tells DynamicLibrary to load the program, not a library.
511 if (sys::DynamicLibrary::LoadLibraryPermanently(nullptr, ErrorStr))
514 // If the user specified a memory manager but didn't specify which engine to
515 // create, we assume they only want the JIT, and we fail if they only want
518 if (WhichEngine & EngineKind::JIT)
519 WhichEngine = EngineKind::JIT;
522 *ErrorStr = "Cannot create an interpreter with a memory manager.";
527 // Unless the interpreter was explicitly selected or the JIT is not linked,
529 if ((WhichEngine & EngineKind::JIT) && TheTM) {
530 Triple TT(M->getTargetTriple());
531 if (!TM->getTarget().hasJIT()) {
532 errs() << "WARNING: This target JIT is not designed for the host"
533 << " you are running. If bad things happen, please choose"
534 << " a different -march switch.\n";
537 ExecutionEngine *EE = nullptr;
538 if (ExecutionEngine::OrcMCJITReplacementCtor && UseOrcMCJITReplacement) {
539 EE = ExecutionEngine::OrcMCJITReplacementCtor(ErrorStr, std::move(MemMgr),
542 EE->addModule(std::move(M));
543 } else if (ExecutionEngine::MCJITCtor)
544 EE = ExecutionEngine::MCJITCtor(std::move(M), ErrorStr, std::move(MemMgr),
545 std::move(Resolver), std::move(TheTM));
548 EE->setVerifyModules(VerifyModules);
553 // If we can't make a JIT and we didn't request one specifically, try making
554 // an interpreter instead.
555 if (WhichEngine & EngineKind::Interpreter) {
556 if (ExecutionEngine::InterpCtor)
557 return ExecutionEngine::InterpCtor(std::move(M), ErrorStr);
559 *ErrorStr = "Interpreter has not been linked in.";
563 if ((WhichEngine & EngineKind::JIT) && !ExecutionEngine::MCJITCtor) {
565 *ErrorStr = "JIT has not been linked in.";
571 void *ExecutionEngine::getPointerToGlobal(const GlobalValue *GV) {
572 if (Function *F = const_cast<Function*>(dyn_cast<Function>(GV)))
573 return getPointerToFunction(F);
575 MutexGuard locked(lock);
576 if (void* P = getPointerToGlobalIfAvailable(GV))
579 // Global variable might have been added since interpreter started.
580 if (GlobalVariable *GVar =
581 const_cast<GlobalVariable *>(dyn_cast<GlobalVariable>(GV)))
582 EmitGlobalVariable(GVar);
584 llvm_unreachable("Global hasn't had an address allocated yet!");
586 return getPointerToGlobalIfAvailable(GV);
589 /// \brief Converts a Constant* into a GenericValue, including handling of
590 /// ConstantExpr values.
591 GenericValue ExecutionEngine::getConstantValue(const Constant *C) {
592 // If its undefined, return the garbage.
593 if (isa<UndefValue>(C)) {
595 switch (C->getType()->getTypeID()) {
598 case Type::IntegerTyID:
599 case Type::X86_FP80TyID:
600 case Type::FP128TyID:
601 case Type::PPC_FP128TyID:
602 // Although the value is undefined, we still have to construct an APInt
603 // with the correct bit width.
604 Result.IntVal = APInt(C->getType()->getPrimitiveSizeInBits(), 0);
606 case Type::StructTyID: {
607 // if the whole struct is 'undef' just reserve memory for the value.
608 if(StructType *STy = dyn_cast<StructType>(C->getType())) {
609 unsigned int elemNum = STy->getNumElements();
610 Result.AggregateVal.resize(elemNum);
611 for (unsigned int i = 0; i < elemNum; ++i) {
612 Type *ElemTy = STy->getElementType(i);
613 if (ElemTy->isIntegerTy())
614 Result.AggregateVal[i].IntVal =
615 APInt(ElemTy->getPrimitiveSizeInBits(), 0);
616 else if (ElemTy->isAggregateType()) {
617 const Constant *ElemUndef = UndefValue::get(ElemTy);
618 Result.AggregateVal[i] = getConstantValue(ElemUndef);
624 case Type::VectorTyID:
625 // if the whole vector is 'undef' just reserve memory for the value.
626 const VectorType* VTy = dyn_cast<VectorType>(C->getType());
627 const Type *ElemTy = VTy->getElementType();
628 unsigned int elemNum = VTy->getNumElements();
629 Result.AggregateVal.resize(elemNum);
630 if (ElemTy->isIntegerTy())
631 for (unsigned int i = 0; i < elemNum; ++i)
632 Result.AggregateVal[i].IntVal =
633 APInt(ElemTy->getPrimitiveSizeInBits(), 0);
639 // Otherwise, if the value is a ConstantExpr...
640 if (const ConstantExpr *CE = dyn_cast<ConstantExpr>(C)) {
641 Constant *Op0 = CE->getOperand(0);
642 switch (CE->getOpcode()) {
643 case Instruction::GetElementPtr: {
645 GenericValue Result = getConstantValue(Op0);
646 APInt Offset(DL.getPointerSizeInBits(), 0);
647 cast<GEPOperator>(CE)->accumulateConstantOffset(DL, Offset);
649 char* tmp = (char*) Result.PointerVal;
650 Result = PTOGV(tmp + Offset.getSExtValue());
653 case Instruction::Trunc: {
654 GenericValue GV = getConstantValue(Op0);
655 uint32_t BitWidth = cast<IntegerType>(CE->getType())->getBitWidth();
656 GV.IntVal = GV.IntVal.trunc(BitWidth);
659 case Instruction::ZExt: {
660 GenericValue GV = getConstantValue(Op0);
661 uint32_t BitWidth = cast<IntegerType>(CE->getType())->getBitWidth();
662 GV.IntVal = GV.IntVal.zext(BitWidth);
665 case Instruction::SExt: {
666 GenericValue GV = getConstantValue(Op0);
667 uint32_t BitWidth = cast<IntegerType>(CE->getType())->getBitWidth();
668 GV.IntVal = GV.IntVal.sext(BitWidth);
671 case Instruction::FPTrunc: {
673 GenericValue GV = getConstantValue(Op0);
674 GV.FloatVal = float(GV.DoubleVal);
677 case Instruction::FPExt:{
679 GenericValue GV = getConstantValue(Op0);
680 GV.DoubleVal = double(GV.FloatVal);
683 case Instruction::UIToFP: {
684 GenericValue GV = getConstantValue(Op0);
685 if (CE->getType()->isFloatTy())
686 GV.FloatVal = float(GV.IntVal.roundToDouble());
687 else if (CE->getType()->isDoubleTy())
688 GV.DoubleVal = GV.IntVal.roundToDouble();
689 else if (CE->getType()->isX86_FP80Ty()) {
690 APFloat apf = APFloat::getZero(APFloat::x87DoubleExtended);
691 (void)apf.convertFromAPInt(GV.IntVal,
693 APFloat::rmNearestTiesToEven);
694 GV.IntVal = apf.bitcastToAPInt();
698 case Instruction::SIToFP: {
699 GenericValue GV = getConstantValue(Op0);
700 if (CE->getType()->isFloatTy())
701 GV.FloatVal = float(GV.IntVal.signedRoundToDouble());
702 else if (CE->getType()->isDoubleTy())
703 GV.DoubleVal = GV.IntVal.signedRoundToDouble();
704 else if (CE->getType()->isX86_FP80Ty()) {
705 APFloat apf = APFloat::getZero(APFloat::x87DoubleExtended);
706 (void)apf.convertFromAPInt(GV.IntVal,
708 APFloat::rmNearestTiesToEven);
709 GV.IntVal = apf.bitcastToAPInt();
713 case Instruction::FPToUI: // double->APInt conversion handles sign
714 case Instruction::FPToSI: {
715 GenericValue GV = getConstantValue(Op0);
716 uint32_t BitWidth = cast<IntegerType>(CE->getType())->getBitWidth();
717 if (Op0->getType()->isFloatTy())
718 GV.IntVal = APIntOps::RoundFloatToAPInt(GV.FloatVal, BitWidth);
719 else if (Op0->getType()->isDoubleTy())
720 GV.IntVal = APIntOps::RoundDoubleToAPInt(GV.DoubleVal, BitWidth);
721 else if (Op0->getType()->isX86_FP80Ty()) {
722 APFloat apf = APFloat(APFloat::x87DoubleExtended, GV.IntVal);
725 (void)apf.convertToInteger(&v, BitWidth,
726 CE->getOpcode()==Instruction::FPToSI,
727 APFloat::rmTowardZero, &ignored);
728 GV.IntVal = v; // endian?
732 case Instruction::PtrToInt: {
733 GenericValue GV = getConstantValue(Op0);
734 uint32_t PtrWidth = DL.getTypeSizeInBits(Op0->getType());
735 assert(PtrWidth <= 64 && "Bad pointer width");
736 GV.IntVal = APInt(PtrWidth, uintptr_t(GV.PointerVal));
737 uint32_t IntWidth = DL.getTypeSizeInBits(CE->getType());
738 GV.IntVal = GV.IntVal.zextOrTrunc(IntWidth);
741 case Instruction::IntToPtr: {
742 GenericValue GV = getConstantValue(Op0);
743 uint32_t PtrWidth = DL.getTypeSizeInBits(CE->getType());
744 GV.IntVal = GV.IntVal.zextOrTrunc(PtrWidth);
745 assert(GV.IntVal.getBitWidth() <= 64 && "Bad pointer width");
746 GV.PointerVal = PointerTy(uintptr_t(GV.IntVal.getZExtValue()));
749 case Instruction::BitCast: {
750 GenericValue GV = getConstantValue(Op0);
751 Type* DestTy = CE->getType();
752 switch (Op0->getType()->getTypeID()) {
753 default: llvm_unreachable("Invalid bitcast operand");
754 case Type::IntegerTyID:
755 assert(DestTy->isFloatingPointTy() && "invalid bitcast");
756 if (DestTy->isFloatTy())
757 GV.FloatVal = GV.IntVal.bitsToFloat();
758 else if (DestTy->isDoubleTy())
759 GV.DoubleVal = GV.IntVal.bitsToDouble();
761 case Type::FloatTyID:
762 assert(DestTy->isIntegerTy(32) && "Invalid bitcast");
763 GV.IntVal = APInt::floatToBits(GV.FloatVal);
765 case Type::DoubleTyID:
766 assert(DestTy->isIntegerTy(64) && "Invalid bitcast");
767 GV.IntVal = APInt::doubleToBits(GV.DoubleVal);
769 case Type::PointerTyID:
770 assert(DestTy->isPointerTy() && "Invalid bitcast");
771 break; // getConstantValue(Op0) above already converted it
775 case Instruction::Add:
776 case Instruction::FAdd:
777 case Instruction::Sub:
778 case Instruction::FSub:
779 case Instruction::Mul:
780 case Instruction::FMul:
781 case Instruction::UDiv:
782 case Instruction::SDiv:
783 case Instruction::URem:
784 case Instruction::SRem:
785 case Instruction::And:
786 case Instruction::Or:
787 case Instruction::Xor: {
788 GenericValue LHS = getConstantValue(Op0);
789 GenericValue RHS = getConstantValue(CE->getOperand(1));
791 switch (CE->getOperand(0)->getType()->getTypeID()) {
792 default: llvm_unreachable("Bad add type!");
793 case Type::IntegerTyID:
794 switch (CE->getOpcode()) {
795 default: llvm_unreachable("Invalid integer opcode");
796 case Instruction::Add: GV.IntVal = LHS.IntVal + RHS.IntVal; break;
797 case Instruction::Sub: GV.IntVal = LHS.IntVal - RHS.IntVal; break;
798 case Instruction::Mul: GV.IntVal = LHS.IntVal * RHS.IntVal; break;
799 case Instruction::UDiv:GV.IntVal = LHS.IntVal.udiv(RHS.IntVal); break;
800 case Instruction::SDiv:GV.IntVal = LHS.IntVal.sdiv(RHS.IntVal); break;
801 case Instruction::URem:GV.IntVal = LHS.IntVal.urem(RHS.IntVal); break;
802 case Instruction::SRem:GV.IntVal = LHS.IntVal.srem(RHS.IntVal); break;
803 case Instruction::And: GV.IntVal = LHS.IntVal & RHS.IntVal; break;
804 case Instruction::Or: GV.IntVal = LHS.IntVal | RHS.IntVal; break;
805 case Instruction::Xor: GV.IntVal = LHS.IntVal ^ RHS.IntVal; break;
808 case Type::FloatTyID:
809 switch (CE->getOpcode()) {
810 default: llvm_unreachable("Invalid float opcode");
811 case Instruction::FAdd:
812 GV.FloatVal = LHS.FloatVal + RHS.FloatVal; break;
813 case Instruction::FSub:
814 GV.FloatVal = LHS.FloatVal - RHS.FloatVal; break;
815 case Instruction::FMul:
816 GV.FloatVal = LHS.FloatVal * RHS.FloatVal; break;
817 case Instruction::FDiv:
818 GV.FloatVal = LHS.FloatVal / RHS.FloatVal; break;
819 case Instruction::FRem:
820 GV.FloatVal = std::fmod(LHS.FloatVal,RHS.FloatVal); break;
823 case Type::DoubleTyID:
824 switch (CE->getOpcode()) {
825 default: llvm_unreachable("Invalid double opcode");
826 case Instruction::FAdd:
827 GV.DoubleVal = LHS.DoubleVal + RHS.DoubleVal; break;
828 case Instruction::FSub:
829 GV.DoubleVal = LHS.DoubleVal - RHS.DoubleVal; break;
830 case Instruction::FMul:
831 GV.DoubleVal = LHS.DoubleVal * RHS.DoubleVal; break;
832 case Instruction::FDiv:
833 GV.DoubleVal = LHS.DoubleVal / RHS.DoubleVal; break;
834 case Instruction::FRem:
835 GV.DoubleVal = std::fmod(LHS.DoubleVal,RHS.DoubleVal); break;
838 case Type::X86_FP80TyID:
839 case Type::PPC_FP128TyID:
840 case Type::FP128TyID: {
841 const fltSemantics &Sem = CE->getOperand(0)->getType()->getFltSemantics();
842 APFloat apfLHS = APFloat(Sem, LHS.IntVal);
843 switch (CE->getOpcode()) {
844 default: llvm_unreachable("Invalid long double opcode");
845 case Instruction::FAdd:
846 apfLHS.add(APFloat(Sem, RHS.IntVal), APFloat::rmNearestTiesToEven);
847 GV.IntVal = apfLHS.bitcastToAPInt();
849 case Instruction::FSub:
850 apfLHS.subtract(APFloat(Sem, RHS.IntVal),
851 APFloat::rmNearestTiesToEven);
852 GV.IntVal = apfLHS.bitcastToAPInt();
854 case Instruction::FMul:
855 apfLHS.multiply(APFloat(Sem, RHS.IntVal),
856 APFloat::rmNearestTiesToEven);
857 GV.IntVal = apfLHS.bitcastToAPInt();
859 case Instruction::FDiv:
860 apfLHS.divide(APFloat(Sem, RHS.IntVal),
861 APFloat::rmNearestTiesToEven);
862 GV.IntVal = apfLHS.bitcastToAPInt();
864 case Instruction::FRem:
865 apfLHS.mod(APFloat(Sem, RHS.IntVal),
866 APFloat::rmNearestTiesToEven);
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 const VectorType *VT = cast<VectorType>(Ty);
1149 const 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->getType()->getElementType();
1354 size_t GVSize = (size_t)getDataLayout().getTypeAllocSize(ElTy);
1355 NumInitBytes += (unsigned)GVSize;