1 //===-- ExecutionEngine.cpp - Common Implementation shared by EEs ---------===//
3 // Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
4 // See https://llvm.org/LICENSE.txt for license information.
5 // SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
7 //===----------------------------------------------------------------------===//
9 // This file defines the common interface used by the various execution engine
12 // FIXME: This file needs to be updated to support scalable vectors
14 //===----------------------------------------------------------------------===//
16 #include "llvm/ExecutionEngine/ExecutionEngine.h"
17 #include "llvm/ADT/STLExtras.h"
18 #include "llvm/ADT/SmallString.h"
19 #include "llvm/ADT/Statistic.h"
20 #include "llvm/ExecutionEngine/GenericValue.h"
21 #include "llvm/ExecutionEngine/JITEventListener.h"
22 #include "llvm/ExecutionEngine/ObjectCache.h"
23 #include "llvm/ExecutionEngine/RTDyldMemoryManager.h"
24 #include "llvm/IR/Constants.h"
25 #include "llvm/IR/DataLayout.h"
26 #include "llvm/IR/DerivedTypes.h"
27 #include "llvm/IR/Mangler.h"
28 #include "llvm/IR/Module.h"
29 #include "llvm/IR/Operator.h"
30 #include "llvm/IR/ValueHandle.h"
31 #include "llvm/Object/Archive.h"
32 #include "llvm/Object/ObjectFile.h"
33 #include "llvm/Support/Debug.h"
34 #include "llvm/Support/DynamicLibrary.h"
35 #include "llvm/Support/ErrorHandling.h"
36 #include "llvm/Support/Host.h"
37 #include "llvm/Support/TargetRegistry.h"
38 #include "llvm/Support/raw_ostream.h"
39 #include "llvm/Target/TargetMachine.h"
45 #define DEBUG_TYPE "jit"
47 STATISTIC(NumInitBytes, "Number of bytes of global vars initialized");
48 STATISTIC(NumGlobals , "Number of global vars initialized");
50 ExecutionEngine *(*ExecutionEngine::MCJITCtor)(
51 std::unique_ptr<Module> M, std::string *ErrorStr,
52 std::shared_ptr<MCJITMemoryManager> MemMgr,
53 std::shared_ptr<LegacyJITSymbolResolver> Resolver,
54 std::unique_ptr<TargetMachine> TM) = nullptr;
56 ExecutionEngine *(*ExecutionEngine::OrcMCJITReplacementCtor)(
57 std::string *ErrorStr, std::shared_ptr<MCJITMemoryManager> MemMgr,
58 std::shared_ptr<LegacyJITSymbolResolver> Resolver,
59 std::unique_ptr<TargetMachine> TM) = nullptr;
61 ExecutionEngine *(*ExecutionEngine::InterpCtor)(std::unique_ptr<Module> M,
62 std::string *ErrorStr) =nullptr;
64 void JITEventListener::anchor() {}
66 void ObjectCache::anchor() {}
68 void ExecutionEngine::Init(std::unique_ptr<Module> M) {
69 CompilingLazily = false;
70 GVCompilationDisabled = false;
71 SymbolSearchingDisabled = false;
73 // IR module verification is enabled by default in debug builds, and disabled
74 // by default in release builds.
78 VerifyModules = false;
81 assert(M && "Module is null?");
82 Modules.push_back(std::move(M));
85 ExecutionEngine::ExecutionEngine(std::unique_ptr<Module> M)
86 : DL(M->getDataLayout()), LazyFunctionCreator(nullptr) {
90 ExecutionEngine::ExecutionEngine(DataLayout DL, std::unique_ptr<Module> M)
91 : DL(std::move(DL)), LazyFunctionCreator(nullptr) {
95 ExecutionEngine::~ExecutionEngine() {
96 clearAllGlobalMappings();
100 /// Helper class which uses a value handler to automatically deletes the
101 /// memory block when the GlobalVariable is destroyed.
102 class GVMemoryBlock final : public CallbackVH {
103 GVMemoryBlock(const GlobalVariable *GV)
104 : CallbackVH(const_cast<GlobalVariable*>(GV)) {}
107 /// Returns the address the GlobalVariable should be written into. The
108 /// GVMemoryBlock object prefixes that.
109 static char *Create(const GlobalVariable *GV, const DataLayout& TD) {
110 Type *ElTy = GV->getValueType();
111 size_t GVSize = (size_t)TD.getTypeAllocSize(ElTy);
112 void *RawMemory = ::operator new(
113 alignTo(sizeof(GVMemoryBlock), TD.getPreferredAlign(GV)) + GVSize);
114 new(RawMemory) GVMemoryBlock(GV);
115 return static_cast<char*>(RawMemory) + sizeof(GVMemoryBlock);
118 void deleted() override {
119 // We allocated with operator new and with some extra memory hanging off the
120 // end, so don't just delete this. I'm not sure if this is actually
122 this->~GVMemoryBlock();
123 ::operator delete(this);
126 } // anonymous namespace
128 char *ExecutionEngine::getMemoryForGV(const GlobalVariable *GV) {
129 return GVMemoryBlock::Create(GV, getDataLayout());
132 void ExecutionEngine::addObjectFile(std::unique_ptr<object::ObjectFile> O) {
133 llvm_unreachable("ExecutionEngine subclass doesn't implement addObjectFile.");
137 ExecutionEngine::addObjectFile(object::OwningBinary<object::ObjectFile> O) {
138 llvm_unreachable("ExecutionEngine subclass doesn't implement addObjectFile.");
141 void ExecutionEngine::addArchive(object::OwningBinary<object::Archive> A) {
142 llvm_unreachable("ExecutionEngine subclass doesn't implement addArchive.");
145 bool ExecutionEngine::removeModule(Module *M) {
146 for (auto I = Modules.begin(), E = Modules.end(); I != E; ++I) {
147 Module *Found = I->get();
151 clearGlobalMappingsFromModule(M);
158 Function *ExecutionEngine::FindFunctionNamed(StringRef FnName) {
159 for (unsigned i = 0, e = Modules.size(); i != e; ++i) {
160 Function *F = Modules[i]->getFunction(FnName);
161 if (F && !F->isDeclaration())
167 GlobalVariable *ExecutionEngine::FindGlobalVariableNamed(StringRef Name, bool AllowInternal) {
168 for (unsigned i = 0, e = Modules.size(); i != e; ++i) {
169 GlobalVariable *GV = Modules[i]->getGlobalVariable(Name,AllowInternal);
170 if (GV && !GV->isDeclaration())
176 uint64_t ExecutionEngineState::RemoveMapping(StringRef Name) {
177 GlobalAddressMapTy::iterator I = GlobalAddressMap.find(Name);
180 // FIXME: This is silly, we shouldn't end up with a mapping -> 0 in the
182 if (I == GlobalAddressMap.end())
185 GlobalAddressReverseMap.erase(I->second);
187 GlobalAddressMap.erase(I);
193 std::string ExecutionEngine::getMangledName(const GlobalValue *GV) {
194 assert(GV->hasName() && "Global must have name.");
196 std::lock_guard<sys::Mutex> locked(lock);
197 SmallString<128> FullName;
199 const DataLayout &DL =
200 GV->getParent()->getDataLayout().isDefault()
202 : GV->getParent()->getDataLayout();
204 Mangler::getNameWithPrefix(FullName, GV->getName(), DL);
205 return std::string(FullName.str());
208 void ExecutionEngine::addGlobalMapping(const GlobalValue *GV, void *Addr) {
209 std::lock_guard<sys::Mutex> locked(lock);
210 addGlobalMapping(getMangledName(GV), (uint64_t) Addr);
213 void ExecutionEngine::addGlobalMapping(StringRef Name, uint64_t Addr) {
214 std::lock_guard<sys::Mutex> locked(lock);
216 assert(!Name.empty() && "Empty GlobalMapping symbol name!");
218 LLVM_DEBUG(dbgs() << "JIT: Map \'" << Name << "\' to [" << Addr << "]\n";);
219 uint64_t &CurVal = EEState.getGlobalAddressMap()[Name];
220 assert((!CurVal || !Addr) && "GlobalMapping already established!");
223 // If we are using the reverse mapping, add it too.
224 if (!EEState.getGlobalAddressReverseMap().empty()) {
225 std::string &V = EEState.getGlobalAddressReverseMap()[CurVal];
226 assert((!V.empty() || !Name.empty()) &&
227 "GlobalMapping already established!");
228 V = std::string(Name);
232 void ExecutionEngine::clearAllGlobalMappings() {
233 std::lock_guard<sys::Mutex> locked(lock);
235 EEState.getGlobalAddressMap().clear();
236 EEState.getGlobalAddressReverseMap().clear();
239 void ExecutionEngine::clearGlobalMappingsFromModule(Module *M) {
240 std::lock_guard<sys::Mutex> locked(lock);
242 for (GlobalObject &GO : M->global_objects())
243 EEState.RemoveMapping(getMangledName(&GO));
246 uint64_t ExecutionEngine::updateGlobalMapping(const GlobalValue *GV,
248 std::lock_guard<sys::Mutex> locked(lock);
249 return updateGlobalMapping(getMangledName(GV), (uint64_t) Addr);
252 uint64_t ExecutionEngine::updateGlobalMapping(StringRef Name, uint64_t Addr) {
253 std::lock_guard<sys::Mutex> locked(lock);
255 ExecutionEngineState::GlobalAddressMapTy &Map =
256 EEState.getGlobalAddressMap();
258 // Deleting from the mapping?
260 return EEState.RemoveMapping(Name);
262 uint64_t &CurVal = Map[Name];
263 uint64_t OldVal = CurVal;
265 if (CurVal && !EEState.getGlobalAddressReverseMap().empty())
266 EEState.getGlobalAddressReverseMap().erase(CurVal);
269 // If we are using the reverse mapping, add it too.
270 if (!EEState.getGlobalAddressReverseMap().empty()) {
271 std::string &V = EEState.getGlobalAddressReverseMap()[CurVal];
272 assert((!V.empty() || !Name.empty()) &&
273 "GlobalMapping already established!");
274 V = std::string(Name);
279 uint64_t ExecutionEngine::getAddressToGlobalIfAvailable(StringRef S) {
280 std::lock_guard<sys::Mutex> locked(lock);
281 uint64_t Address = 0;
282 ExecutionEngineState::GlobalAddressMapTy::iterator I =
283 EEState.getGlobalAddressMap().find(S);
284 if (I != EEState.getGlobalAddressMap().end())
290 void *ExecutionEngine::getPointerToGlobalIfAvailable(StringRef S) {
291 std::lock_guard<sys::Mutex> locked(lock);
292 if (void* Address = (void *) getAddressToGlobalIfAvailable(S))
297 void *ExecutionEngine::getPointerToGlobalIfAvailable(const GlobalValue *GV) {
298 std::lock_guard<sys::Mutex> locked(lock);
299 return getPointerToGlobalIfAvailable(getMangledName(GV));
302 const GlobalValue *ExecutionEngine::getGlobalValueAtAddress(void *Addr) {
303 std::lock_guard<sys::Mutex> locked(lock);
305 // If we haven't computed the reverse mapping yet, do so first.
306 if (EEState.getGlobalAddressReverseMap().empty()) {
307 for (ExecutionEngineState::GlobalAddressMapTy::iterator
308 I = EEState.getGlobalAddressMap().begin(),
309 E = EEState.getGlobalAddressMap().end(); I != E; ++I) {
310 StringRef Name = I->first();
311 uint64_t Addr = I->second;
312 EEState.getGlobalAddressReverseMap().insert(
313 std::make_pair(Addr, std::string(Name)));
317 std::map<uint64_t, std::string>::iterator I =
318 EEState.getGlobalAddressReverseMap().find((uint64_t) Addr);
320 if (I != EEState.getGlobalAddressReverseMap().end()) {
321 StringRef Name = I->second;
322 for (unsigned i = 0, e = Modules.size(); i != e; ++i)
323 if (GlobalValue *GV = Modules[i]->getNamedValue(Name))
331 std::unique_ptr<char[]> Array;
332 std::vector<std::unique_ptr<char[]>> Values;
334 /// Turn a vector of strings into a nice argv style array of pointers to null
335 /// terminated strings.
336 void *reset(LLVMContext &C, ExecutionEngine *EE,
337 const std::vector<std::string> &InputArgv);
339 } // anonymous namespace
340 void *ArgvArray::reset(LLVMContext &C, ExecutionEngine *EE,
341 const std::vector<std::string> &InputArgv) {
342 Values.clear(); // Free the old contents.
343 Values.reserve(InputArgv.size());
344 unsigned PtrSize = EE->getDataLayout().getPointerSize();
345 Array = std::make_unique<char[]>((InputArgv.size()+1)*PtrSize);
347 LLVM_DEBUG(dbgs() << "JIT: ARGV = " << (void *)Array.get() << "\n");
348 Type *SBytePtr = Type::getInt8PtrTy(C);
350 for (unsigned i = 0; i != InputArgv.size(); ++i) {
351 unsigned Size = InputArgv[i].size()+1;
352 auto Dest = std::make_unique<char[]>(Size);
353 LLVM_DEBUG(dbgs() << "JIT: ARGV[" << i << "] = " << (void *)Dest.get()
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 StringRef 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 UseOrcMCJITReplacement(false) {
481 // IR module verification is enabled by default in debug builds, and disabled
482 // by default in release builds.
484 VerifyModules = true;
486 VerifyModules = false;
490 EngineBuilder::~EngineBuilder() = default;
492 EngineBuilder &EngineBuilder::setMCJITMemoryManager(
493 std::unique_ptr<RTDyldMemoryManager> mcjmm) {
494 auto SharedMM = std::shared_ptr<RTDyldMemoryManager>(std::move(mcjmm));
501 EngineBuilder::setMemoryManager(std::unique_ptr<MCJITMemoryManager> MM) {
502 MemMgr = std::shared_ptr<MCJITMemoryManager>(std::move(MM));
507 EngineBuilder::setSymbolResolver(std::unique_ptr<LegacyJITSymbolResolver> SR) {
508 Resolver = std::shared_ptr<LegacyJITSymbolResolver>(std::move(SR));
512 ExecutionEngine *EngineBuilder::create(TargetMachine *TM) {
513 std::unique_ptr<TargetMachine> TheTM(TM); // Take ownership.
515 // Make sure we can resolve symbols in the program as well. The zero arg
516 // to the function tells DynamicLibrary to load the program, not a library.
517 if (sys::DynamicLibrary::LoadLibraryPermanently(nullptr, ErrorStr))
520 // If the user specified a memory manager but didn't specify which engine to
521 // create, we assume they only want the JIT, and we fail if they only want
524 if (WhichEngine & EngineKind::JIT)
525 WhichEngine = EngineKind::JIT;
528 *ErrorStr = "Cannot create an interpreter with a memory manager.";
533 // Unless the interpreter was explicitly selected or the JIT is not linked,
535 if ((WhichEngine & EngineKind::JIT) && TheTM) {
536 if (!TM->getTarget().hasJIT()) {
537 errs() << "WARNING: This target JIT is not designed for the host"
538 << " you are running. If bad things happen, please choose"
539 << " a different -march switch.\n";
542 ExecutionEngine *EE = nullptr;
543 if (ExecutionEngine::OrcMCJITReplacementCtor && UseOrcMCJITReplacement) {
544 EE = ExecutionEngine::OrcMCJITReplacementCtor(ErrorStr, std::move(MemMgr),
547 EE->addModule(std::move(M));
548 } else if (ExecutionEngine::MCJITCtor)
549 EE = ExecutionEngine::MCJITCtor(std::move(M), ErrorStr, std::move(MemMgr),
550 std::move(Resolver), std::move(TheTM));
553 EE->setVerifyModules(VerifyModules);
558 // If we can't make a JIT and we didn't request one specifically, try making
559 // an interpreter instead.
560 if (WhichEngine & EngineKind::Interpreter) {
561 if (ExecutionEngine::InterpCtor)
562 return ExecutionEngine::InterpCtor(std::move(M), ErrorStr);
564 *ErrorStr = "Interpreter has not been linked in.";
568 if ((WhichEngine & EngineKind::JIT) && !ExecutionEngine::MCJITCtor) {
570 *ErrorStr = "JIT has not been linked in.";
576 void *ExecutionEngine::getPointerToGlobal(const GlobalValue *GV) {
577 if (Function *F = const_cast<Function*>(dyn_cast<Function>(GV)))
578 return getPointerToFunction(F);
580 std::lock_guard<sys::Mutex> locked(lock);
581 if (void* P = getPointerToGlobalIfAvailable(GV))
584 // Global variable might have been added since interpreter started.
585 if (GlobalVariable *GVar =
586 const_cast<GlobalVariable *>(dyn_cast<GlobalVariable>(GV)))
587 emitGlobalVariable(GVar);
589 llvm_unreachable("Global hasn't had an address allocated yet!");
591 return getPointerToGlobalIfAvailable(GV);
594 /// Converts a Constant* into a GenericValue, including handling of
595 /// ConstantExpr values.
596 GenericValue ExecutionEngine::getConstantValue(const Constant *C) {
597 // If its undefined, return the garbage.
598 if (isa<UndefValue>(C)) {
600 switch (C->getType()->getTypeID()) {
603 case Type::IntegerTyID:
604 case Type::X86_FP80TyID:
605 case Type::FP128TyID:
606 case Type::PPC_FP128TyID:
607 // Although the value is undefined, we still have to construct an APInt
608 // with the correct bit width.
609 Result.IntVal = APInt(C->getType()->getPrimitiveSizeInBits(), 0);
611 case Type::StructTyID: {
612 // if the whole struct is 'undef' just reserve memory for the value.
613 if(StructType *STy = dyn_cast<StructType>(C->getType())) {
614 unsigned int elemNum = STy->getNumElements();
615 Result.AggregateVal.resize(elemNum);
616 for (unsigned int i = 0; i < elemNum; ++i) {
617 Type *ElemTy = STy->getElementType(i);
618 if (ElemTy->isIntegerTy())
619 Result.AggregateVal[i].IntVal =
620 APInt(ElemTy->getPrimitiveSizeInBits(), 0);
621 else if (ElemTy->isAggregateType()) {
622 const Constant *ElemUndef = UndefValue::get(ElemTy);
623 Result.AggregateVal[i] = getConstantValue(ElemUndef);
629 case Type::ScalableVectorTyID:
631 "Scalable vector support not yet implemented in ExecutionEngine");
632 case Type::FixedVectorTyID:
633 // if the whole vector is 'undef' just reserve memory for the value.
634 auto *VTy = cast<FixedVectorType>(C->getType());
635 Type *ElemTy = VTy->getElementType();
636 unsigned int elemNum = VTy->getNumElements();
637 Result.AggregateVal.resize(elemNum);
638 if (ElemTy->isIntegerTy())
639 for (unsigned int i = 0; i < elemNum; ++i)
640 Result.AggregateVal[i].IntVal =
641 APInt(ElemTy->getPrimitiveSizeInBits(), 0);
647 // Otherwise, if the value is a ConstantExpr...
648 if (const ConstantExpr *CE = dyn_cast<ConstantExpr>(C)) {
649 Constant *Op0 = CE->getOperand(0);
650 switch (CE->getOpcode()) {
651 case Instruction::GetElementPtr: {
653 GenericValue Result = getConstantValue(Op0);
654 APInt Offset(DL.getPointerSizeInBits(), 0);
655 cast<GEPOperator>(CE)->accumulateConstantOffset(DL, Offset);
657 char* tmp = (char*) Result.PointerVal;
658 Result = PTOGV(tmp + Offset.getSExtValue());
661 case Instruction::Trunc: {
662 GenericValue GV = getConstantValue(Op0);
663 uint32_t BitWidth = cast<IntegerType>(CE->getType())->getBitWidth();
664 GV.IntVal = GV.IntVal.trunc(BitWidth);
667 case Instruction::ZExt: {
668 GenericValue GV = getConstantValue(Op0);
669 uint32_t BitWidth = cast<IntegerType>(CE->getType())->getBitWidth();
670 GV.IntVal = GV.IntVal.zext(BitWidth);
673 case Instruction::SExt: {
674 GenericValue GV = getConstantValue(Op0);
675 uint32_t BitWidth = cast<IntegerType>(CE->getType())->getBitWidth();
676 GV.IntVal = GV.IntVal.sext(BitWidth);
679 case Instruction::FPTrunc: {
681 GenericValue GV = getConstantValue(Op0);
682 GV.FloatVal = float(GV.DoubleVal);
685 case Instruction::FPExt:{
687 GenericValue GV = getConstantValue(Op0);
688 GV.DoubleVal = double(GV.FloatVal);
691 case Instruction::UIToFP: {
692 GenericValue GV = getConstantValue(Op0);
693 if (CE->getType()->isFloatTy())
694 GV.FloatVal = float(GV.IntVal.roundToDouble());
695 else if (CE->getType()->isDoubleTy())
696 GV.DoubleVal = GV.IntVal.roundToDouble();
697 else if (CE->getType()->isX86_FP80Ty()) {
698 APFloat apf = APFloat::getZero(APFloat::x87DoubleExtended());
699 (void)apf.convertFromAPInt(GV.IntVal,
701 APFloat::rmNearestTiesToEven);
702 GV.IntVal = apf.bitcastToAPInt();
706 case Instruction::SIToFP: {
707 GenericValue GV = getConstantValue(Op0);
708 if (CE->getType()->isFloatTy())
709 GV.FloatVal = float(GV.IntVal.signedRoundToDouble());
710 else if (CE->getType()->isDoubleTy())
711 GV.DoubleVal = GV.IntVal.signedRoundToDouble();
712 else if (CE->getType()->isX86_FP80Ty()) {
713 APFloat apf = APFloat::getZero(APFloat::x87DoubleExtended());
714 (void)apf.convertFromAPInt(GV.IntVal,
716 APFloat::rmNearestTiesToEven);
717 GV.IntVal = apf.bitcastToAPInt();
721 case Instruction::FPToUI: // double->APInt conversion handles sign
722 case Instruction::FPToSI: {
723 GenericValue GV = getConstantValue(Op0);
724 uint32_t BitWidth = cast<IntegerType>(CE->getType())->getBitWidth();
725 if (Op0->getType()->isFloatTy())
726 GV.IntVal = APIntOps::RoundFloatToAPInt(GV.FloatVal, BitWidth);
727 else if (Op0->getType()->isDoubleTy())
728 GV.IntVal = APIntOps::RoundDoubleToAPInt(GV.DoubleVal, BitWidth);
729 else if (Op0->getType()->isX86_FP80Ty()) {
730 APFloat apf = APFloat(APFloat::x87DoubleExtended(), GV.IntVal);
733 (void)apf.convertToInteger(makeMutableArrayRef(v), BitWidth,
734 CE->getOpcode()==Instruction::FPToSI,
735 APFloat::rmTowardZero, &ignored);
736 GV.IntVal = v; // endian?
740 case Instruction::PtrToInt: {
741 GenericValue GV = getConstantValue(Op0);
742 uint32_t PtrWidth = DL.getTypeSizeInBits(Op0->getType());
743 assert(PtrWidth <= 64 && "Bad pointer width");
744 GV.IntVal = APInt(PtrWidth, uintptr_t(GV.PointerVal));
745 uint32_t IntWidth = DL.getTypeSizeInBits(CE->getType());
746 GV.IntVal = GV.IntVal.zextOrTrunc(IntWidth);
749 case Instruction::IntToPtr: {
750 GenericValue GV = getConstantValue(Op0);
751 uint32_t PtrWidth = DL.getTypeSizeInBits(CE->getType());
752 GV.IntVal = GV.IntVal.zextOrTrunc(PtrWidth);
753 assert(GV.IntVal.getBitWidth() <= 64 && "Bad pointer width");
754 GV.PointerVal = PointerTy(uintptr_t(GV.IntVal.getZExtValue()));
757 case Instruction::BitCast: {
758 GenericValue GV = getConstantValue(Op0);
759 Type* DestTy = CE->getType();
760 switch (Op0->getType()->getTypeID()) {
761 default: llvm_unreachable("Invalid bitcast operand");
762 case Type::IntegerTyID:
763 assert(DestTy->isFloatingPointTy() && "invalid bitcast");
764 if (DestTy->isFloatTy())
765 GV.FloatVal = GV.IntVal.bitsToFloat();
766 else if (DestTy->isDoubleTy())
767 GV.DoubleVal = GV.IntVal.bitsToDouble();
769 case Type::FloatTyID:
770 assert(DestTy->isIntegerTy(32) && "Invalid bitcast");
771 GV.IntVal = APInt::floatToBits(GV.FloatVal);
773 case Type::DoubleTyID:
774 assert(DestTy->isIntegerTy(64) && "Invalid bitcast");
775 GV.IntVal = APInt::doubleToBits(GV.DoubleVal);
777 case Type::PointerTyID:
778 assert(DestTy->isPointerTy() && "Invalid bitcast");
779 break; // getConstantValue(Op0) above already converted it
783 case Instruction::Add:
784 case Instruction::FAdd:
785 case Instruction::Sub:
786 case Instruction::FSub:
787 case Instruction::Mul:
788 case Instruction::FMul:
789 case Instruction::UDiv:
790 case Instruction::SDiv:
791 case Instruction::URem:
792 case Instruction::SRem:
793 case Instruction::And:
794 case Instruction::Or:
795 case Instruction::Xor: {
796 GenericValue LHS = getConstantValue(Op0);
797 GenericValue RHS = getConstantValue(CE->getOperand(1));
799 switch (CE->getOperand(0)->getType()->getTypeID()) {
800 default: llvm_unreachable("Bad add type!");
801 case Type::IntegerTyID:
802 switch (CE->getOpcode()) {
803 default: llvm_unreachable("Invalid integer opcode");
804 case Instruction::Add: GV.IntVal = LHS.IntVal + RHS.IntVal; break;
805 case Instruction::Sub: GV.IntVal = LHS.IntVal - RHS.IntVal; break;
806 case Instruction::Mul: GV.IntVal = LHS.IntVal * RHS.IntVal; break;
807 case Instruction::UDiv:GV.IntVal = LHS.IntVal.udiv(RHS.IntVal); break;
808 case Instruction::SDiv:GV.IntVal = LHS.IntVal.sdiv(RHS.IntVal); break;
809 case Instruction::URem:GV.IntVal = LHS.IntVal.urem(RHS.IntVal); break;
810 case Instruction::SRem:GV.IntVal = LHS.IntVal.srem(RHS.IntVal); break;
811 case Instruction::And: GV.IntVal = LHS.IntVal & RHS.IntVal; break;
812 case Instruction::Or: GV.IntVal = LHS.IntVal | RHS.IntVal; break;
813 case Instruction::Xor: GV.IntVal = LHS.IntVal ^ RHS.IntVal; break;
816 case Type::FloatTyID:
817 switch (CE->getOpcode()) {
818 default: llvm_unreachable("Invalid float opcode");
819 case Instruction::FAdd:
820 GV.FloatVal = LHS.FloatVal + RHS.FloatVal; break;
821 case Instruction::FSub:
822 GV.FloatVal = LHS.FloatVal - RHS.FloatVal; break;
823 case Instruction::FMul:
824 GV.FloatVal = LHS.FloatVal * RHS.FloatVal; break;
825 case Instruction::FDiv:
826 GV.FloatVal = LHS.FloatVal / RHS.FloatVal; break;
827 case Instruction::FRem:
828 GV.FloatVal = std::fmod(LHS.FloatVal,RHS.FloatVal); break;
831 case Type::DoubleTyID:
832 switch (CE->getOpcode()) {
833 default: llvm_unreachable("Invalid double opcode");
834 case Instruction::FAdd:
835 GV.DoubleVal = LHS.DoubleVal + RHS.DoubleVal; break;
836 case Instruction::FSub:
837 GV.DoubleVal = LHS.DoubleVal - RHS.DoubleVal; break;
838 case Instruction::FMul:
839 GV.DoubleVal = LHS.DoubleVal * RHS.DoubleVal; break;
840 case Instruction::FDiv:
841 GV.DoubleVal = LHS.DoubleVal / RHS.DoubleVal; break;
842 case Instruction::FRem:
843 GV.DoubleVal = std::fmod(LHS.DoubleVal,RHS.DoubleVal); break;
846 case Type::X86_FP80TyID:
847 case Type::PPC_FP128TyID:
848 case Type::FP128TyID: {
849 const fltSemantics &Sem = CE->getOperand(0)->getType()->getFltSemantics();
850 APFloat apfLHS = APFloat(Sem, LHS.IntVal);
851 switch (CE->getOpcode()) {
852 default: llvm_unreachable("Invalid long double opcode");
853 case Instruction::FAdd:
854 apfLHS.add(APFloat(Sem, RHS.IntVal), APFloat::rmNearestTiesToEven);
855 GV.IntVal = apfLHS.bitcastToAPInt();
857 case Instruction::FSub:
858 apfLHS.subtract(APFloat(Sem, RHS.IntVal),
859 APFloat::rmNearestTiesToEven);
860 GV.IntVal = apfLHS.bitcastToAPInt();
862 case Instruction::FMul:
863 apfLHS.multiply(APFloat(Sem, RHS.IntVal),
864 APFloat::rmNearestTiesToEven);
865 GV.IntVal = apfLHS.bitcastToAPInt();
867 case Instruction::FDiv:
868 apfLHS.divide(APFloat(Sem, RHS.IntVal),
869 APFloat::rmNearestTiesToEven);
870 GV.IntVal = apfLHS.bitcastToAPInt();
872 case Instruction::FRem:
873 apfLHS.mod(APFloat(Sem, RHS.IntVal));
874 GV.IntVal = apfLHS.bitcastToAPInt();
886 SmallString<256> Msg;
887 raw_svector_ostream OS(Msg);
888 OS << "ConstantExpr not handled: " << *CE;
889 report_fatal_error(OS.str());
892 // Otherwise, we have a simple constant.
894 switch (C->getType()->getTypeID()) {
895 case Type::FloatTyID:
896 Result.FloatVal = cast<ConstantFP>(C)->getValueAPF().convertToFloat();
898 case Type::DoubleTyID:
899 Result.DoubleVal = cast<ConstantFP>(C)->getValueAPF().convertToDouble();
901 case Type::X86_FP80TyID:
902 case Type::FP128TyID:
903 case Type::PPC_FP128TyID:
904 Result.IntVal = cast <ConstantFP>(C)->getValueAPF().bitcastToAPInt();
906 case Type::IntegerTyID:
907 Result.IntVal = cast<ConstantInt>(C)->getValue();
909 case Type::PointerTyID:
910 while (auto *A = dyn_cast<GlobalAlias>(C)) {
913 if (isa<ConstantPointerNull>(C))
914 Result.PointerVal = nullptr;
915 else if (const Function *F = dyn_cast<Function>(C))
916 Result = PTOGV(getPointerToFunctionOrStub(const_cast<Function*>(F)));
917 else if (const GlobalVariable *GV = dyn_cast<GlobalVariable>(C))
918 Result = PTOGV(getOrEmitGlobalVariable(const_cast<GlobalVariable*>(GV)));
920 llvm_unreachable("Unknown constant pointer type!");
922 case Type::ScalableVectorTyID:
924 "Scalable vector support not yet implemented in ExecutionEngine");
925 case Type::FixedVectorTyID: {
928 const ConstantDataVector *CDV = dyn_cast<ConstantDataVector>(C);
929 const ConstantVector *CV = dyn_cast<ConstantVector>(C);
930 const ConstantAggregateZero *CAZ = dyn_cast<ConstantAggregateZero>(C);
933 elemNum = CDV->getNumElements();
934 ElemTy = CDV->getElementType();
935 } else if (CV || CAZ) {
936 auto *VTy = cast<FixedVectorType>(C->getType());
937 elemNum = VTy->getNumElements();
938 ElemTy = VTy->getElementType();
940 llvm_unreachable("Unknown constant vector type!");
943 Result.AggregateVal.resize(elemNum);
944 // Check if vector holds floats.
945 if(ElemTy->isFloatTy()) {
947 GenericValue floatZero;
948 floatZero.FloatVal = 0.f;
949 std::fill(Result.AggregateVal.begin(), Result.AggregateVal.end(),
954 for (unsigned i = 0; i < elemNum; ++i)
955 if (!isa<UndefValue>(CV->getOperand(i)))
956 Result.AggregateVal[i].FloatVal = cast<ConstantFP>(
957 CV->getOperand(i))->getValueAPF().convertToFloat();
961 for (unsigned i = 0; i < elemNum; ++i)
962 Result.AggregateVal[i].FloatVal = CDV->getElementAsFloat(i);
966 // Check if vector holds doubles.
967 if (ElemTy->isDoubleTy()) {
969 GenericValue doubleZero;
970 doubleZero.DoubleVal = 0.0;
971 std::fill(Result.AggregateVal.begin(), Result.AggregateVal.end(),
976 for (unsigned i = 0; i < elemNum; ++i)
977 if (!isa<UndefValue>(CV->getOperand(i)))
978 Result.AggregateVal[i].DoubleVal = cast<ConstantFP>(
979 CV->getOperand(i))->getValueAPF().convertToDouble();
983 for (unsigned i = 0; i < elemNum; ++i)
984 Result.AggregateVal[i].DoubleVal = CDV->getElementAsDouble(i);
988 // Check if vector holds integers.
989 if (ElemTy->isIntegerTy()) {
991 GenericValue intZero;
992 intZero.IntVal = APInt(ElemTy->getScalarSizeInBits(), 0ull);
993 std::fill(Result.AggregateVal.begin(), Result.AggregateVal.end(),
998 for (unsigned i = 0; i < elemNum; ++i)
999 if (!isa<UndefValue>(CV->getOperand(i)))
1000 Result.AggregateVal[i].IntVal = cast<ConstantInt>(
1001 CV->getOperand(i))->getValue();
1003 Result.AggregateVal[i].IntVal =
1004 APInt(CV->getOperand(i)->getType()->getPrimitiveSizeInBits(), 0);
1009 for (unsigned i = 0; i < elemNum; ++i)
1010 Result.AggregateVal[i].IntVal = APInt(
1011 CDV->getElementType()->getPrimitiveSizeInBits(),
1012 CDV->getElementAsInteger(i));
1016 llvm_unreachable("Unknown constant pointer type!");
1020 SmallString<256> Msg;
1021 raw_svector_ostream OS(Msg);
1022 OS << "ERROR: Constant unimplemented for type: " << *C->getType();
1023 report_fatal_error(OS.str());
1029 void ExecutionEngine::StoreValueToMemory(const GenericValue &Val,
1030 GenericValue *Ptr, Type *Ty) {
1031 const unsigned StoreBytes = getDataLayout().getTypeStoreSize(Ty);
1033 switch (Ty->getTypeID()) {
1035 dbgs() << "Cannot store value of type " << *Ty << "!\n";
1037 case Type::IntegerTyID:
1038 StoreIntToMemory(Val.IntVal, (uint8_t*)Ptr, StoreBytes);
1040 case Type::FloatTyID:
1041 *((float*)Ptr) = Val.FloatVal;
1043 case Type::DoubleTyID:
1044 *((double*)Ptr) = Val.DoubleVal;
1046 case Type::X86_FP80TyID:
1047 memcpy(Ptr, Val.IntVal.getRawData(), 10);
1049 case Type::PointerTyID:
1050 // Ensure 64 bit target pointers are fully initialized on 32 bit hosts.
1051 if (StoreBytes != sizeof(PointerTy))
1052 memset(&(Ptr->PointerVal), 0, StoreBytes);
1054 *((PointerTy*)Ptr) = Val.PointerVal;
1056 case Type::FixedVectorTyID:
1057 case Type::ScalableVectorTyID:
1058 for (unsigned i = 0; i < Val.AggregateVal.size(); ++i) {
1059 if (cast<VectorType>(Ty)->getElementType()->isDoubleTy())
1060 *(((double*)Ptr)+i) = Val.AggregateVal[i].DoubleVal;
1061 if (cast<VectorType>(Ty)->getElementType()->isFloatTy())
1062 *(((float*)Ptr)+i) = Val.AggregateVal[i].FloatVal;
1063 if (cast<VectorType>(Ty)->getElementType()->isIntegerTy()) {
1064 unsigned numOfBytes =(Val.AggregateVal[i].IntVal.getBitWidth()+7)/8;
1065 StoreIntToMemory(Val.AggregateVal[i].IntVal,
1066 (uint8_t*)Ptr + numOfBytes*i, numOfBytes);
1072 if (sys::IsLittleEndianHost != getDataLayout().isLittleEndian())
1073 // Host and target are different endian - reverse the stored bytes.
1074 std::reverse((uint8_t*)Ptr, StoreBytes + (uint8_t*)Ptr);
1079 void ExecutionEngine::LoadValueFromMemory(GenericValue &Result,
1082 const unsigned LoadBytes = getDataLayout().getTypeStoreSize(Ty);
1084 switch (Ty->getTypeID()) {
1085 case Type::IntegerTyID:
1086 // An APInt with all words initially zero.
1087 Result.IntVal = APInt(cast<IntegerType>(Ty)->getBitWidth(), 0);
1088 LoadIntFromMemory(Result.IntVal, (uint8_t*)Ptr, LoadBytes);
1090 case Type::FloatTyID:
1091 Result.FloatVal = *((float*)Ptr);
1093 case Type::DoubleTyID:
1094 Result.DoubleVal = *((double*)Ptr);
1096 case Type::PointerTyID:
1097 Result.PointerVal = *((PointerTy*)Ptr);
1099 case Type::X86_FP80TyID: {
1100 // This is endian dependent, but it will only work on x86 anyway.
1101 // FIXME: Will not trap if loading a signaling NaN.
1104 Result.IntVal = APInt(80, y);
1107 case Type::ScalableVectorTyID:
1109 "Scalable vector support not yet implemented in ExecutionEngine");
1110 case Type::FixedVectorTyID: {
1111 auto *VT = cast<FixedVectorType>(Ty);
1112 Type *ElemT = VT->getElementType();
1113 const unsigned numElems = VT->getNumElements();
1114 if (ElemT->isFloatTy()) {
1115 Result.AggregateVal.resize(numElems);
1116 for (unsigned i = 0; i < numElems; ++i)
1117 Result.AggregateVal[i].FloatVal = *((float*)Ptr+i);
1119 if (ElemT->isDoubleTy()) {
1120 Result.AggregateVal.resize(numElems);
1121 for (unsigned i = 0; i < numElems; ++i)
1122 Result.AggregateVal[i].DoubleVal = *((double*)Ptr+i);
1124 if (ElemT->isIntegerTy()) {
1125 GenericValue intZero;
1126 const unsigned elemBitWidth = cast<IntegerType>(ElemT)->getBitWidth();
1127 intZero.IntVal = APInt(elemBitWidth, 0);
1128 Result.AggregateVal.resize(numElems, intZero);
1129 for (unsigned i = 0; i < numElems; ++i)
1130 LoadIntFromMemory(Result.AggregateVal[i].IntVal,
1131 (uint8_t*)Ptr+((elemBitWidth+7)/8)*i, (elemBitWidth+7)/8);
1136 SmallString<256> Msg;
1137 raw_svector_ostream OS(Msg);
1138 OS << "Cannot load value of type " << *Ty << "!";
1139 report_fatal_error(OS.str());
1143 void ExecutionEngine::InitializeMemory(const Constant *Init, void *Addr) {
1144 LLVM_DEBUG(dbgs() << "JIT: Initializing " << Addr << " ");
1145 LLVM_DEBUG(Init->dump());
1146 if (isa<UndefValue>(Init))
1149 if (const ConstantVector *CP = dyn_cast<ConstantVector>(Init)) {
1150 unsigned ElementSize =
1151 getDataLayout().getTypeAllocSize(CP->getType()->getElementType());
1152 for (unsigned i = 0, e = CP->getNumOperands(); i != e; ++i)
1153 InitializeMemory(CP->getOperand(i), (char*)Addr+i*ElementSize);
1157 if (isa<ConstantAggregateZero>(Init)) {
1158 memset(Addr, 0, (size_t)getDataLayout().getTypeAllocSize(Init->getType()));
1162 if (const ConstantArray *CPA = dyn_cast<ConstantArray>(Init)) {
1163 unsigned ElementSize =
1164 getDataLayout().getTypeAllocSize(CPA->getType()->getElementType());
1165 for (unsigned i = 0, e = CPA->getNumOperands(); i != e; ++i)
1166 InitializeMemory(CPA->getOperand(i), (char*)Addr+i*ElementSize);
1170 if (const ConstantStruct *CPS = dyn_cast<ConstantStruct>(Init)) {
1171 const StructLayout *SL =
1172 getDataLayout().getStructLayout(cast<StructType>(CPS->getType()));
1173 for (unsigned i = 0, e = CPS->getNumOperands(); i != e; ++i)
1174 InitializeMemory(CPS->getOperand(i), (char*)Addr+SL->getElementOffset(i));
1178 if (const ConstantDataSequential *CDS =
1179 dyn_cast<ConstantDataSequential>(Init)) {
1180 // CDS is already laid out in host memory order.
1181 StringRef Data = CDS->getRawDataValues();
1182 memcpy(Addr, Data.data(), Data.size());
1186 if (Init->getType()->isFirstClassType()) {
1187 GenericValue Val = getConstantValue(Init);
1188 StoreValueToMemory(Val, (GenericValue*)Addr, Init->getType());
1192 LLVM_DEBUG(dbgs() << "Bad Type: " << *Init->getType() << "\n");
1193 llvm_unreachable("Unknown constant type to initialize memory with!");
1196 /// EmitGlobals - Emit all of the global variables to memory, storing their
1197 /// addresses into GlobalAddress. This must make sure to copy the contents of
1198 /// their initializers into the memory.
1199 void ExecutionEngine::emitGlobals() {
1200 // Loop over all of the global variables in the program, allocating the memory
1201 // to hold them. If there is more than one module, do a prepass over globals
1202 // to figure out how the different modules should link together.
1203 std::map<std::pair<std::string, Type*>,
1204 const GlobalValue*> LinkedGlobalsMap;
1206 if (Modules.size() != 1) {
1207 for (unsigned m = 0, e = Modules.size(); m != e; ++m) {
1208 Module &M = *Modules[m];
1209 for (const auto &GV : M.globals()) {
1210 if (GV.hasLocalLinkage() || GV.isDeclaration() ||
1211 GV.hasAppendingLinkage() || !GV.hasName())
1212 continue;// Ignore external globals and globals with internal linkage.
1214 const GlobalValue *&GVEntry = LinkedGlobalsMap[std::make_pair(
1215 std::string(GV.getName()), GV.getType())];
1217 // If this is the first time we've seen this global, it is the canonical
1224 // If the existing global is strong, never replace it.
1225 if (GVEntry->hasExternalLinkage())
1228 // Otherwise, we know it's linkonce/weak, replace it if this is a strong
1229 // symbol. FIXME is this right for common?
1230 if (GV.hasExternalLinkage() || GVEntry->hasExternalWeakLinkage())
1236 std::vector<const GlobalValue*> NonCanonicalGlobals;
1237 for (unsigned m = 0, e = Modules.size(); m != e; ++m) {
1238 Module &M = *Modules[m];
1239 for (const auto &GV : M.globals()) {
1240 // In the multi-module case, see what this global maps to.
1241 if (!LinkedGlobalsMap.empty()) {
1242 if (const GlobalValue *GVEntry = LinkedGlobalsMap[std::make_pair(
1243 std::string(GV.getName()), GV.getType())]) {
1244 // If something else is the canonical global, ignore this one.
1245 if (GVEntry != &GV) {
1246 NonCanonicalGlobals.push_back(&GV);
1252 if (!GV.isDeclaration()) {
1253 addGlobalMapping(&GV, getMemoryForGV(&GV));
1255 // External variable reference. Try to use the dynamic loader to
1256 // get a pointer to it.
1257 if (void *SymAddr = sys::DynamicLibrary::SearchForAddressOfSymbol(
1258 std::string(GV.getName())))
1259 addGlobalMapping(&GV, SymAddr);
1261 report_fatal_error("Could not resolve external global address: "
1267 // If there are multiple modules, map the non-canonical globals to their
1268 // canonical location.
1269 if (!NonCanonicalGlobals.empty()) {
1270 for (unsigned i = 0, e = NonCanonicalGlobals.size(); i != e; ++i) {
1271 const GlobalValue *GV = NonCanonicalGlobals[i];
1272 const GlobalValue *CGV = LinkedGlobalsMap[std::make_pair(
1273 std::string(GV->getName()), GV->getType())];
1274 void *Ptr = getPointerToGlobalIfAvailable(CGV);
1275 assert(Ptr && "Canonical global wasn't codegen'd!");
1276 addGlobalMapping(GV, Ptr);
1280 // Now that all of the globals are set up in memory, loop through them all
1281 // and initialize their contents.
1282 for (const auto &GV : M.globals()) {
1283 if (!GV.isDeclaration()) {
1284 if (!LinkedGlobalsMap.empty()) {
1285 if (const GlobalValue *GVEntry = LinkedGlobalsMap[std::make_pair(
1286 std::string(GV.getName()), GV.getType())])
1287 if (GVEntry != &GV) // Not the canonical variable.
1290 emitGlobalVariable(&GV);
1296 // EmitGlobalVariable - This method emits the specified global variable to the
1297 // address specified in GlobalAddresses, or allocates new memory if it's not
1298 // already in the map.
1299 void ExecutionEngine::emitGlobalVariable(const GlobalVariable *GV) {
1300 void *GA = getPointerToGlobalIfAvailable(GV);
1303 // If it's not already specified, allocate memory for the global.
1304 GA = getMemoryForGV(GV);
1306 // If we failed to allocate memory for this global, return.
1309 addGlobalMapping(GV, GA);
1312 // Don't initialize if it's thread local, let the client do it.
1313 if (!GV->isThreadLocal())
1314 InitializeMemory(GV->getInitializer(), GA);
1316 Type *ElTy = GV->getValueType();
1317 size_t GVSize = (size_t)getDataLayout().getTypeAllocSize(ElTy);
1318 NumInitBytes += (unsigned)GVSize;