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llvm-mirror/lib/ExecutionEngine/ExecutionEngine.cpp
Lang Hames 2d8b3a7239 [ORC] Remove OrcV1 APIs. 
This removes all legacy layers, legacy utilities, the old Orc C bindings,
OrcMCJITReplacement, and OrcMCJITReplacement regression tests.

ExecutionEngine and MCJIT are not affected by this change.
2020-10-18 21:02:44 -07:00

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//===-- ExecutionEngine.cpp - Common Implementation shared by EEs ---------===//
//
// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
// See https://llvm.org/LICENSE.txt for license information.
// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
//
//===----------------------------------------------------------------------===//
//
// This file defines the common interface used by the various execution engine
// subclasses.
//
// FIXME: This file needs to be updated to support scalable vectors
//
//===----------------------------------------------------------------------===//
#include "llvm/ExecutionEngine/ExecutionEngine.h"
#include "llvm/ADT/STLExtras.h"
#include "llvm/ADT/SmallString.h"
#include "llvm/ADT/Statistic.h"
#include "llvm/ExecutionEngine/GenericValue.h"
#include "llvm/ExecutionEngine/JITEventListener.h"
#include "llvm/ExecutionEngine/ObjectCache.h"
#include "llvm/ExecutionEngine/RTDyldMemoryManager.h"
#include "llvm/IR/Constants.h"
#include "llvm/IR/DataLayout.h"
#include "llvm/IR/DerivedTypes.h"
#include "llvm/IR/Mangler.h"
#include "llvm/IR/Module.h"
#include "llvm/IR/Operator.h"
#include "llvm/IR/ValueHandle.h"
#include "llvm/Object/Archive.h"
#include "llvm/Object/ObjectFile.h"
#include "llvm/Support/Debug.h"
#include "llvm/Support/DynamicLibrary.h"
#include "llvm/Support/ErrorHandling.h"
#include "llvm/Support/Host.h"
#include "llvm/Support/TargetRegistry.h"
#include "llvm/Support/raw_ostream.h"
#include "llvm/Target/TargetMachine.h"
#include <cmath>
#include <cstring>
#include <mutex>
using namespace llvm;
#define DEBUG_TYPE "jit"
STATISTIC(NumInitBytes, "Number of bytes of global vars initialized");
STATISTIC(NumGlobals , "Number of global vars initialized");
ExecutionEngine *(*ExecutionEngine::MCJITCtor)(
std::unique_ptr<Module> M, std::string *ErrorStr,
std::shared_ptr<MCJITMemoryManager> MemMgr,
std::shared_ptr<LegacyJITSymbolResolver> Resolver,
std::unique_ptr<TargetMachine> TM) = nullptr;
ExecutionEngine *(*ExecutionEngine::InterpCtor)(std::unique_ptr<Module> M,
std::string *ErrorStr) =nullptr;
void JITEventListener::anchor() {}
void ObjectCache::anchor() {}
void ExecutionEngine::Init(std::unique_ptr<Module> M) {
CompilingLazily = false;
GVCompilationDisabled = false;
SymbolSearchingDisabled = false;
// IR module verification is enabled by default in debug builds, and disabled
// by default in release builds.
#ifndef NDEBUG
VerifyModules = true;
#else
VerifyModules = false;
#endif
assert(M && "Module is null?");
Modules.push_back(std::move(M));
}
ExecutionEngine::ExecutionEngine(std::unique_ptr<Module> M)
: DL(M->getDataLayout()), LazyFunctionCreator(nullptr) {
Init(std::move(M));
}
ExecutionEngine::ExecutionEngine(DataLayout DL, std::unique_ptr<Module> M)
: DL(std::move(DL)), LazyFunctionCreator(nullptr) {
Init(std::move(M));
}
ExecutionEngine::~ExecutionEngine() {
clearAllGlobalMappings();
}
namespace {
/// Helper class which uses a value handler to automatically deletes the
/// memory block when the GlobalVariable is destroyed.
class GVMemoryBlock final : public CallbackVH {
GVMemoryBlock(const GlobalVariable *GV)
: CallbackVH(const_cast<GlobalVariable*>(GV)) {}
public:
/// Returns the address the GlobalVariable should be written into. The
/// GVMemoryBlock object prefixes that.
static char *Create(const GlobalVariable *GV, const DataLayout& TD) {
Type *ElTy = GV->getValueType();
size_t GVSize = (size_t)TD.getTypeAllocSize(ElTy);
void *RawMemory = ::operator new(
alignTo(sizeof(GVMemoryBlock), TD.getPreferredAlign(GV)) + GVSize);
new(RawMemory) GVMemoryBlock(GV);
return static_cast<char*>(RawMemory) + sizeof(GVMemoryBlock);
}
void deleted() override {
// We allocated with operator new and with some extra memory hanging off the
// end, so don't just delete this. I'm not sure if this is actually
// required.
this->~GVMemoryBlock();
::operator delete(this);
}
};
} // anonymous namespace
char *ExecutionEngine::getMemoryForGV(const GlobalVariable *GV) {
return GVMemoryBlock::Create(GV, getDataLayout());
}
void ExecutionEngine::addObjectFile(std::unique_ptr<object::ObjectFile> O) {
llvm_unreachable("ExecutionEngine subclass doesn't implement addObjectFile.");
}
void
ExecutionEngine::addObjectFile(object::OwningBinary<object::ObjectFile> O) {
llvm_unreachable("ExecutionEngine subclass doesn't implement addObjectFile.");
}
void ExecutionEngine::addArchive(object::OwningBinary<object::Archive> A) {
llvm_unreachable("ExecutionEngine subclass doesn't implement addArchive.");
}
bool ExecutionEngine::removeModule(Module *M) {
for (auto I = Modules.begin(), E = Modules.end(); I != E; ++I) {
Module *Found = I->get();
if (Found == M) {
I->release();
Modules.erase(I);
clearGlobalMappingsFromModule(M);
return true;
}
}
return false;
}
Function *ExecutionEngine::FindFunctionNamed(StringRef FnName) {
for (unsigned i = 0, e = Modules.size(); i != e; ++i) {
Function *F = Modules[i]->getFunction(FnName);
if (F && !F->isDeclaration())
return F;
}
return nullptr;
}
GlobalVariable *ExecutionEngine::FindGlobalVariableNamed(StringRef Name, bool AllowInternal) {
for (unsigned i = 0, e = Modules.size(); i != e; ++i) {
GlobalVariable *GV = Modules[i]->getGlobalVariable(Name,AllowInternal);
if (GV && !GV->isDeclaration())
return GV;
}
return nullptr;
}
uint64_t ExecutionEngineState::RemoveMapping(StringRef Name) {
GlobalAddressMapTy::iterator I = GlobalAddressMap.find(Name);
uint64_t OldVal;
// FIXME: This is silly, we shouldn't end up with a mapping -> 0 in the
// GlobalAddressMap.
if (I == GlobalAddressMap.end())
OldVal = 0;
else {
GlobalAddressReverseMap.erase(I->second);
OldVal = I->second;
GlobalAddressMap.erase(I);
}
return OldVal;
}
std::string ExecutionEngine::getMangledName(const GlobalValue *GV) {
assert(GV->hasName() && "Global must have name.");
std::lock_guard<sys::Mutex> locked(lock);
SmallString<128> FullName;
const DataLayout &DL =
GV->getParent()->getDataLayout().isDefault()
? getDataLayout()
: GV->getParent()->getDataLayout();
Mangler::getNameWithPrefix(FullName, GV->getName(), DL);
return std::string(FullName.str());
}
void ExecutionEngine::addGlobalMapping(const GlobalValue *GV, void *Addr) {
std::lock_guard<sys::Mutex> locked(lock);
addGlobalMapping(getMangledName(GV), (uint64_t) Addr);
}
void ExecutionEngine::addGlobalMapping(StringRef Name, uint64_t Addr) {
std::lock_guard<sys::Mutex> locked(lock);
assert(!Name.empty() && "Empty GlobalMapping symbol name!");
LLVM_DEBUG(dbgs() << "JIT: Map \'" << Name << "\' to [" << Addr << "]\n";);
uint64_t &CurVal = EEState.getGlobalAddressMap()[Name];
assert((!CurVal || !Addr) && "GlobalMapping already established!");
CurVal = Addr;
// If we are using the reverse mapping, add it too.
if (!EEState.getGlobalAddressReverseMap().empty()) {
std::string &V = EEState.getGlobalAddressReverseMap()[CurVal];
assert((!V.empty() || !Name.empty()) &&
"GlobalMapping already established!");
V = std::string(Name);
}
}
void ExecutionEngine::clearAllGlobalMappings() {
std::lock_guard<sys::Mutex> locked(lock);
EEState.getGlobalAddressMap().clear();
EEState.getGlobalAddressReverseMap().clear();
}
void ExecutionEngine::clearGlobalMappingsFromModule(Module *M) {
std::lock_guard<sys::Mutex> locked(lock);
for (GlobalObject &GO : M->global_objects())
EEState.RemoveMapping(getMangledName(&GO));
}
uint64_t ExecutionEngine::updateGlobalMapping(const GlobalValue *GV,
void *Addr) {
std::lock_guard<sys::Mutex> locked(lock);
return updateGlobalMapping(getMangledName(GV), (uint64_t) Addr);
}
uint64_t ExecutionEngine::updateGlobalMapping(StringRef Name, uint64_t Addr) {
std::lock_guard<sys::Mutex> locked(lock);
ExecutionEngineState::GlobalAddressMapTy &Map =
EEState.getGlobalAddressMap();
// Deleting from the mapping?
if (!Addr)
return EEState.RemoveMapping(Name);
uint64_t &CurVal = Map[Name];
uint64_t OldVal = CurVal;
if (CurVal && !EEState.getGlobalAddressReverseMap().empty())
EEState.getGlobalAddressReverseMap().erase(CurVal);
CurVal = Addr;
// If we are using the reverse mapping, add it too.
if (!EEState.getGlobalAddressReverseMap().empty()) {
std::string &V = EEState.getGlobalAddressReverseMap()[CurVal];
assert((!V.empty() || !Name.empty()) &&
"GlobalMapping already established!");
V = std::string(Name);
}
return OldVal;
}
uint64_t ExecutionEngine::getAddressToGlobalIfAvailable(StringRef S) {
std::lock_guard<sys::Mutex> locked(lock);
uint64_t Address = 0;
ExecutionEngineState::GlobalAddressMapTy::iterator I =
EEState.getGlobalAddressMap().find(S);
if (I != EEState.getGlobalAddressMap().end())
Address = I->second;
return Address;
}
void *ExecutionEngine::getPointerToGlobalIfAvailable(StringRef S) {
std::lock_guard<sys::Mutex> locked(lock);
if (void* Address = (void *) getAddressToGlobalIfAvailable(S))
return Address;
return nullptr;
}
void *ExecutionEngine::getPointerToGlobalIfAvailable(const GlobalValue *GV) {
std::lock_guard<sys::Mutex> locked(lock);
return getPointerToGlobalIfAvailable(getMangledName(GV));
}
const GlobalValue *ExecutionEngine::getGlobalValueAtAddress(void *Addr) {
std::lock_guard<sys::Mutex> locked(lock);
// If we haven't computed the reverse mapping yet, do so first.
if (EEState.getGlobalAddressReverseMap().empty()) {
for (ExecutionEngineState::GlobalAddressMapTy::iterator
I = EEState.getGlobalAddressMap().begin(),
E = EEState.getGlobalAddressMap().end(); I != E; ++I) {
StringRef Name = I->first();
uint64_t Addr = I->second;
EEState.getGlobalAddressReverseMap().insert(
std::make_pair(Addr, std::string(Name)));
}
}
std::map<uint64_t, std::string>::iterator I =
EEState.getGlobalAddressReverseMap().find((uint64_t) Addr);
if (I != EEState.getGlobalAddressReverseMap().end()) {
StringRef Name = I->second;
for (unsigned i = 0, e = Modules.size(); i != e; ++i)
if (GlobalValue *GV = Modules[i]->getNamedValue(Name))
return GV;
}
return nullptr;
}
namespace {
class ArgvArray {
std::unique_ptr<char[]> Array;
std::vector<std::unique_ptr<char[]>> Values;
public:
/// Turn a vector of strings into a nice argv style array of pointers to null
/// terminated strings.
void *reset(LLVMContext &C, ExecutionEngine *EE,
const std::vector<std::string> &InputArgv);
};
} // anonymous namespace
void *ArgvArray::reset(LLVMContext &C, ExecutionEngine *EE,
const std::vector<std::string> &InputArgv) {
Values.clear(); // Free the old contents.
Values.reserve(InputArgv.size());
unsigned PtrSize = EE->getDataLayout().getPointerSize();
Array = std::make_unique<char[]>((InputArgv.size()+1)*PtrSize);
LLVM_DEBUG(dbgs() << "JIT: ARGV = " << (void *)Array.get() << "\n");
Type *SBytePtr = Type::getInt8PtrTy(C);
for (unsigned i = 0; i != InputArgv.size(); ++i) {
unsigned Size = InputArgv[i].size()+1;
auto Dest = std::make_unique<char[]>(Size);
LLVM_DEBUG(dbgs() << "JIT: ARGV[" << i << "] = " << (void *)Dest.get()
<< "\n");
std::copy(InputArgv[i].begin(), InputArgv[i].end(), Dest.get());
Dest[Size-1] = 0;
// Endian safe: Array[i] = (PointerTy)Dest;
EE->StoreValueToMemory(PTOGV(Dest.get()),
(GenericValue*)(&Array[i*PtrSize]), SBytePtr);
Values.push_back(std::move(Dest));
}
// Null terminate it
EE->StoreValueToMemory(PTOGV(nullptr),
(GenericValue*)(&Array[InputArgv.size()*PtrSize]),
SBytePtr);
return Array.get();
}
void ExecutionEngine::runStaticConstructorsDestructors(Module &module,
bool isDtors) {
StringRef Name(isDtors ? "llvm.global_dtors" : "llvm.global_ctors");
GlobalVariable *GV = module.getNamedGlobal(Name);
// If this global has internal linkage, or if it has a use, then it must be
// an old-style (llvmgcc3) static ctor with __main linked in and in use. If
// this is the case, don't execute any of the global ctors, __main will do
// it.
if (!GV || GV->isDeclaration() || GV->hasLocalLinkage()) return;
// Should be an array of '{ i32, void ()* }' structs. The first value is
// the init priority, which we ignore.
ConstantArray *InitList = dyn_cast<ConstantArray>(GV->getInitializer());
if (!InitList)
return;
for (unsigned i = 0, e = InitList->getNumOperands(); i != e; ++i) {
ConstantStruct *CS = dyn_cast<ConstantStruct>(InitList->getOperand(i));
if (!CS) continue;
Constant *FP = CS->getOperand(1);
if (FP->isNullValue())
continue; // Found a sentinal value, ignore.
// Strip off constant expression casts.
if (ConstantExpr *CE = dyn_cast<ConstantExpr>(FP))
if (CE->isCast())
FP = CE->getOperand(0);
// Execute the ctor/dtor function!
if (Function *F = dyn_cast<Function>(FP))
runFunction(F, None);
// FIXME: It is marginally lame that we just do nothing here if we see an
// entry we don't recognize. It might not be unreasonable for the verifier
// to not even allow this and just assert here.
}
}
void ExecutionEngine::runStaticConstructorsDestructors(bool isDtors) {
// Execute global ctors/dtors for each module in the program.
for (std::unique_ptr<Module> &M : Modules)
runStaticConstructorsDestructors(*M, isDtors);
}
#ifndef NDEBUG
/// isTargetNullPtr - Return whether the target pointer stored at Loc is null.
static bool isTargetNullPtr(ExecutionEngine *EE, void *Loc) {
unsigned PtrSize = EE->getDataLayout().getPointerSize();
for (unsigned i = 0; i < PtrSize; ++i)
if (*(i + (uint8_t*)Loc))
return false;
return true;
}
#endif
int ExecutionEngine::runFunctionAsMain(Function *Fn,
const std::vector<std::string> &argv,
const char * const * envp) {
std::vector<GenericValue> GVArgs;
GenericValue GVArgc;
GVArgc.IntVal = APInt(32, argv.size());
// Check main() type
unsigned NumArgs = Fn->getFunctionType()->getNumParams();
FunctionType *FTy = Fn->getFunctionType();
Type* PPInt8Ty = Type::getInt8PtrTy(Fn->getContext())->getPointerTo();
// Check the argument types.
if (NumArgs > 3)
report_fatal_error("Invalid number of arguments of main() supplied");
if (NumArgs >= 3 && FTy->getParamType(2) != PPInt8Ty)
report_fatal_error("Invalid type for third argument of main() supplied");
if (NumArgs >= 2 && FTy->getParamType(1) != PPInt8Ty)
report_fatal_error("Invalid type for second argument of main() supplied");
if (NumArgs >= 1 && !FTy->getParamType(0)->isIntegerTy(32))
report_fatal_error("Invalid type for first argument of main() supplied");
if (!FTy->getReturnType()->isIntegerTy() &&
!FTy->getReturnType()->isVoidTy())
report_fatal_error("Invalid return type of main() supplied");
ArgvArray CArgv;
ArgvArray CEnv;
if (NumArgs) {
GVArgs.push_back(GVArgc); // Arg #0 = argc.
if (NumArgs > 1) {
// Arg #1 = argv.
GVArgs.push_back(PTOGV(CArgv.reset(Fn->getContext(), this, argv)));
assert(!isTargetNullPtr(this, GVTOP(GVArgs[1])) &&
"argv[0] was null after CreateArgv");
if (NumArgs > 2) {
std::vector<std::string> EnvVars;
for (unsigned i = 0; envp[i]; ++i)
EnvVars.emplace_back(envp[i]);
// Arg #2 = envp.
GVArgs.push_back(PTOGV(CEnv.reset(Fn->getContext(), this, EnvVars)));
}
}
}
return runFunction(Fn, GVArgs).IntVal.getZExtValue();
}
EngineBuilder::EngineBuilder() : EngineBuilder(nullptr) {}
EngineBuilder::EngineBuilder(std::unique_ptr<Module> M)
: M(std::move(M)), WhichEngine(EngineKind::Either), ErrorStr(nullptr),
OptLevel(CodeGenOpt::Default), MemMgr(nullptr), Resolver(nullptr) {
// IR module verification is enabled by default in debug builds, and disabled
// by default in release builds.
#ifndef NDEBUG
VerifyModules = true;
#else
VerifyModules = false;
#endif
}
EngineBuilder::~EngineBuilder() = default;
EngineBuilder &EngineBuilder::setMCJITMemoryManager(
std::unique_ptr<RTDyldMemoryManager> mcjmm) {
auto SharedMM = std::shared_ptr<RTDyldMemoryManager>(std::move(mcjmm));
MemMgr = SharedMM;
Resolver = SharedMM;
return *this;
}
EngineBuilder&
EngineBuilder::setMemoryManager(std::unique_ptr<MCJITMemoryManager> MM) {
MemMgr = std::shared_ptr<MCJITMemoryManager>(std::move(MM));
return *this;
}
EngineBuilder &
EngineBuilder::setSymbolResolver(std::unique_ptr<LegacyJITSymbolResolver> SR) {
Resolver = std::shared_ptr<LegacyJITSymbolResolver>(std::move(SR));
return *this;
}
ExecutionEngine *EngineBuilder::create(TargetMachine *TM) {
std::unique_ptr<TargetMachine> TheTM(TM); // Take ownership.
// Make sure we can resolve symbols in the program as well. The zero arg
// to the function tells DynamicLibrary to load the program, not a library.
if (sys::DynamicLibrary::LoadLibraryPermanently(nullptr, ErrorStr))
return nullptr;
// If the user specified a memory manager but didn't specify which engine to
// create, we assume they only want the JIT, and we fail if they only want
// the interpreter.
if (MemMgr) {
if (WhichEngine & EngineKind::JIT)
WhichEngine = EngineKind::JIT;
else {
if (ErrorStr)
*ErrorStr = "Cannot create an interpreter with a memory manager.";
return nullptr;
}
}
// Unless the interpreter was explicitly selected or the JIT is not linked,
// try making a JIT.
if ((WhichEngine & EngineKind::JIT) && TheTM) {
if (!TM->getTarget().hasJIT()) {
errs() << "WARNING: This target JIT is not designed for the host"
<< " you are running. If bad things happen, please choose"
<< " a different -march switch.\n";
}
ExecutionEngine *EE = nullptr;
if (ExecutionEngine::MCJITCtor)
EE = ExecutionEngine::MCJITCtor(std::move(M), ErrorStr, std::move(MemMgr),
std::move(Resolver), std::move(TheTM));
if (EE) {
EE->setVerifyModules(VerifyModules);
return EE;
}
}
// If we can't make a JIT and we didn't request one specifically, try making
// an interpreter instead.
if (WhichEngine & EngineKind::Interpreter) {
if (ExecutionEngine::InterpCtor)
return ExecutionEngine::InterpCtor(std::move(M), ErrorStr);
if (ErrorStr)
*ErrorStr = "Interpreter has not been linked in.";
return nullptr;
}
if ((WhichEngine & EngineKind::JIT) && !ExecutionEngine::MCJITCtor) {
if (ErrorStr)
*ErrorStr = "JIT has not been linked in.";
}
return nullptr;
}
void *ExecutionEngine::getPointerToGlobal(const GlobalValue *GV) {
if (Function *F = const_cast<Function*>(dyn_cast<Function>(GV)))
return getPointerToFunction(F);
std::lock_guard<sys::Mutex> locked(lock);
if (void* P = getPointerToGlobalIfAvailable(GV))
return P;
// Global variable might have been added since interpreter started.
if (GlobalVariable *GVar =
const_cast<GlobalVariable *>(dyn_cast<GlobalVariable>(GV)))
emitGlobalVariable(GVar);
else
llvm_unreachable("Global hasn't had an address allocated yet!");
return getPointerToGlobalIfAvailable(GV);
}
/// Converts a Constant* into a GenericValue, including handling of
/// ConstantExpr values.
GenericValue ExecutionEngine::getConstantValue(const Constant *C) {
// If its undefined, return the garbage.
if (isa<UndefValue>(C)) {
GenericValue Result;
switch (C->getType()->getTypeID()) {
default:
break;
case Type::IntegerTyID:
case Type::X86_FP80TyID:
case Type::FP128TyID:
case Type::PPC_FP128TyID:
// Although the value is undefined, we still have to construct an APInt
// with the correct bit width.
Result.IntVal = APInt(C->getType()->getPrimitiveSizeInBits(), 0);
break;
case Type::StructTyID: {
// if the whole struct is 'undef' just reserve memory for the value.
if(StructType *STy = dyn_cast<StructType>(C->getType())) {
unsigned int elemNum = STy->getNumElements();
Result.AggregateVal.resize(elemNum);
for (unsigned int i = 0; i < elemNum; ++i) {
Type *ElemTy = STy->getElementType(i);
if (ElemTy->isIntegerTy())
Result.AggregateVal[i].IntVal =
APInt(ElemTy->getPrimitiveSizeInBits(), 0);
else if (ElemTy->isAggregateType()) {
const Constant *ElemUndef = UndefValue::get(ElemTy);
Result.AggregateVal[i] = getConstantValue(ElemUndef);
}
}
}
}
break;
case Type::ScalableVectorTyID:
report_fatal_error(
"Scalable vector support not yet implemented in ExecutionEngine");
case Type::FixedVectorTyID:
// if the whole vector is 'undef' just reserve memory for the value.
auto *VTy = cast<FixedVectorType>(C->getType());
Type *ElemTy = VTy->getElementType();
unsigned int elemNum = VTy->getNumElements();
Result.AggregateVal.resize(elemNum);
if (ElemTy->isIntegerTy())
for (unsigned int i = 0; i < elemNum; ++i)
Result.AggregateVal[i].IntVal =
APInt(ElemTy->getPrimitiveSizeInBits(), 0);
break;
}
return Result;
}
// Otherwise, if the value is a ConstantExpr...
if (const ConstantExpr *CE = dyn_cast<ConstantExpr>(C)) {
Constant *Op0 = CE->getOperand(0);
switch (CE->getOpcode()) {
case Instruction::GetElementPtr: {
// Compute the index
GenericValue Result = getConstantValue(Op0);
APInt Offset(DL.getPointerSizeInBits(), 0);
cast<GEPOperator>(CE)->accumulateConstantOffset(DL, Offset);
char* tmp = (char*) Result.PointerVal;
Result = PTOGV(tmp + Offset.getSExtValue());
return Result;
}
case Instruction::Trunc: {
GenericValue GV = getConstantValue(Op0);
uint32_t BitWidth = cast<IntegerType>(CE->getType())->getBitWidth();
GV.IntVal = GV.IntVal.trunc(BitWidth);
return GV;
}
case Instruction::ZExt: {
GenericValue GV = getConstantValue(Op0);
uint32_t BitWidth = cast<IntegerType>(CE->getType())->getBitWidth();
GV.IntVal = GV.IntVal.zext(BitWidth);
return GV;
}
case Instruction::SExt: {
GenericValue GV = getConstantValue(Op0);
uint32_t BitWidth = cast<IntegerType>(CE->getType())->getBitWidth();
GV.IntVal = GV.IntVal.sext(BitWidth);
return GV;
}
case Instruction::FPTrunc: {
// FIXME long double
GenericValue GV = getConstantValue(Op0);
GV.FloatVal = float(GV.DoubleVal);
return GV;
}
case Instruction::FPExt:{
// FIXME long double
GenericValue GV = getConstantValue(Op0);
GV.DoubleVal = double(GV.FloatVal);
return GV;
}
case Instruction::UIToFP: {
GenericValue GV = getConstantValue(Op0);
if (CE->getType()->isFloatTy())
GV.FloatVal = float(GV.IntVal.roundToDouble());
else if (CE->getType()->isDoubleTy())
GV.DoubleVal = GV.IntVal.roundToDouble();
else if (CE->getType()->isX86_FP80Ty()) {
APFloat apf = APFloat::getZero(APFloat::x87DoubleExtended());
(void)apf.convertFromAPInt(GV.IntVal,
false,
APFloat::rmNearestTiesToEven);
GV.IntVal = apf.bitcastToAPInt();
}
return GV;
}
case Instruction::SIToFP: {
GenericValue GV = getConstantValue(Op0);
if (CE->getType()->isFloatTy())
GV.FloatVal = float(GV.IntVal.signedRoundToDouble());
else if (CE->getType()->isDoubleTy())
GV.DoubleVal = GV.IntVal.signedRoundToDouble();
else if (CE->getType()->isX86_FP80Ty()) {
APFloat apf = APFloat::getZero(APFloat::x87DoubleExtended());
(void)apf.convertFromAPInt(GV.IntVal,
true,
APFloat::rmNearestTiesToEven);
GV.IntVal = apf.bitcastToAPInt();
}
return GV;
}
case Instruction::FPToUI: // double->APInt conversion handles sign
case Instruction::FPToSI: {
GenericValue GV = getConstantValue(Op0);
uint32_t BitWidth = cast<IntegerType>(CE->getType())->getBitWidth();
if (Op0->getType()->isFloatTy())
GV.IntVal = APIntOps::RoundFloatToAPInt(GV.FloatVal, BitWidth);
else if (Op0->getType()->isDoubleTy())
GV.IntVal = APIntOps::RoundDoubleToAPInt(GV.DoubleVal, BitWidth);
else if (Op0->getType()->isX86_FP80Ty()) {
APFloat apf = APFloat(APFloat::x87DoubleExtended(), GV.IntVal);
uint64_t v;
bool ignored;
(void)apf.convertToInteger(makeMutableArrayRef(v), BitWidth,
CE->getOpcode()==Instruction::FPToSI,
APFloat::rmTowardZero, &ignored);
GV.IntVal = v; // endian?
}
return GV;
}
case Instruction::PtrToInt: {
GenericValue GV = getConstantValue(Op0);
uint32_t PtrWidth = DL.getTypeSizeInBits(Op0->getType());
assert(PtrWidth <= 64 && "Bad pointer width");
GV.IntVal = APInt(PtrWidth, uintptr_t(GV.PointerVal));
uint32_t IntWidth = DL.getTypeSizeInBits(CE->getType());
GV.IntVal = GV.IntVal.zextOrTrunc(IntWidth);
return GV;
}
case Instruction::IntToPtr: {
GenericValue GV = getConstantValue(Op0);
uint32_t PtrWidth = DL.getTypeSizeInBits(CE->getType());
GV.IntVal = GV.IntVal.zextOrTrunc(PtrWidth);
assert(GV.IntVal.getBitWidth() <= 64 && "Bad pointer width");
GV.PointerVal = PointerTy(uintptr_t(GV.IntVal.getZExtValue()));
return GV;
}
case Instruction::BitCast: {
GenericValue GV = getConstantValue(Op0);
Type* DestTy = CE->getType();
switch (Op0->getType()->getTypeID()) {
default: llvm_unreachable("Invalid bitcast operand");
case Type::IntegerTyID:
assert(DestTy->isFloatingPointTy() && "invalid bitcast");
if (DestTy->isFloatTy())
GV.FloatVal = GV.IntVal.bitsToFloat();
else if (DestTy->isDoubleTy())
GV.DoubleVal = GV.IntVal.bitsToDouble();
break;
case Type::FloatTyID:
assert(DestTy->isIntegerTy(32) && "Invalid bitcast");
GV.IntVal = APInt::floatToBits(GV.FloatVal);
break;
case Type::DoubleTyID:
assert(DestTy->isIntegerTy(64) && "Invalid bitcast");
GV.IntVal = APInt::doubleToBits(GV.DoubleVal);
break;
case Type::PointerTyID:
assert(DestTy->isPointerTy() && "Invalid bitcast");
break; // getConstantValue(Op0) above already converted it
}
return GV;
}
case Instruction::Add:
case Instruction::FAdd:
case Instruction::Sub:
case Instruction::FSub:
case Instruction::Mul:
case Instruction::FMul:
case Instruction::UDiv:
case Instruction::SDiv:
case Instruction::URem:
case Instruction::SRem:
case Instruction::And:
case Instruction::Or:
case Instruction::Xor: {
GenericValue LHS = getConstantValue(Op0);
GenericValue RHS = getConstantValue(CE->getOperand(1));
GenericValue GV;
switch (CE->getOperand(0)->getType()->getTypeID()) {
default: llvm_unreachable("Bad add type!");
case Type::IntegerTyID:
switch (CE->getOpcode()) {
default: llvm_unreachable("Invalid integer opcode");
case Instruction::Add: GV.IntVal = LHS.IntVal + RHS.IntVal; break;
case Instruction::Sub: GV.IntVal = LHS.IntVal - RHS.IntVal; break;
case Instruction::Mul: GV.IntVal = LHS.IntVal * RHS.IntVal; break;
case Instruction::UDiv:GV.IntVal = LHS.IntVal.udiv(RHS.IntVal); break;
case Instruction::SDiv:GV.IntVal = LHS.IntVal.sdiv(RHS.IntVal); break;
case Instruction::URem:GV.IntVal = LHS.IntVal.urem(RHS.IntVal); break;
case Instruction::SRem:GV.IntVal = LHS.IntVal.srem(RHS.IntVal); break;
case Instruction::And: GV.IntVal = LHS.IntVal & RHS.IntVal; break;
case Instruction::Or: GV.IntVal = LHS.IntVal | RHS.IntVal; break;
case Instruction::Xor: GV.IntVal = LHS.IntVal ^ RHS.IntVal; break;
}
break;
case Type::FloatTyID:
switch (CE->getOpcode()) {
default: llvm_unreachable("Invalid float opcode");
case Instruction::FAdd:
GV.FloatVal = LHS.FloatVal + RHS.FloatVal; break;
case Instruction::FSub:
GV.FloatVal = LHS.FloatVal - RHS.FloatVal; break;
case Instruction::FMul:
GV.FloatVal = LHS.FloatVal * RHS.FloatVal; break;
case Instruction::FDiv:
GV.FloatVal = LHS.FloatVal / RHS.FloatVal; break;
case Instruction::FRem:
GV.FloatVal = std::fmod(LHS.FloatVal,RHS.FloatVal); break;
}
break;
case Type::DoubleTyID:
switch (CE->getOpcode()) {
default: llvm_unreachable("Invalid double opcode");
case Instruction::FAdd:
GV.DoubleVal = LHS.DoubleVal + RHS.DoubleVal; break;
case Instruction::FSub:
GV.DoubleVal = LHS.DoubleVal - RHS.DoubleVal; break;
case Instruction::FMul:
GV.DoubleVal = LHS.DoubleVal * RHS.DoubleVal; break;
case Instruction::FDiv:
GV.DoubleVal = LHS.DoubleVal / RHS.DoubleVal; break;
case Instruction::FRem:
GV.DoubleVal = std::fmod(LHS.DoubleVal,RHS.DoubleVal); break;
}
break;
case Type::X86_FP80TyID:
case Type::PPC_FP128TyID:
case Type::FP128TyID: {
const fltSemantics &Sem = CE->getOperand(0)->getType()->getFltSemantics();
APFloat apfLHS = APFloat(Sem, LHS.IntVal);
switch (CE->getOpcode()) {
default: llvm_unreachable("Invalid long double opcode");
case Instruction::FAdd:
apfLHS.add(APFloat(Sem, RHS.IntVal), APFloat::rmNearestTiesToEven);
GV.IntVal = apfLHS.bitcastToAPInt();
break;
case Instruction::FSub:
apfLHS.subtract(APFloat(Sem, RHS.IntVal),
APFloat::rmNearestTiesToEven);
GV.IntVal = apfLHS.bitcastToAPInt();
break;
case Instruction::FMul:
apfLHS.multiply(APFloat(Sem, RHS.IntVal),
APFloat::rmNearestTiesToEven);
GV.IntVal = apfLHS.bitcastToAPInt();
break;
case Instruction::FDiv:
apfLHS.divide(APFloat(Sem, RHS.IntVal),
APFloat::rmNearestTiesToEven);
GV.IntVal = apfLHS.bitcastToAPInt();
break;
case Instruction::FRem:
apfLHS.mod(APFloat(Sem, RHS.IntVal));
GV.IntVal = apfLHS.bitcastToAPInt();
break;
}
}
break;
}
return GV;
}
default:
break;
}
SmallString<256> Msg;
raw_svector_ostream OS(Msg);
OS << "ConstantExpr not handled: " << *CE;
report_fatal_error(OS.str());
}
// Otherwise, we have a simple constant.
GenericValue Result;
switch (C->getType()->getTypeID()) {
case Type::FloatTyID:
Result.FloatVal = cast<ConstantFP>(C)->getValueAPF().convertToFloat();
break;
case Type::DoubleTyID:
Result.DoubleVal = cast<ConstantFP>(C)->getValueAPF().convertToDouble();
break;
case Type::X86_FP80TyID:
case Type::FP128TyID:
case Type::PPC_FP128TyID:
Result.IntVal = cast <ConstantFP>(C)->getValueAPF().bitcastToAPInt();
break;
case Type::IntegerTyID:
Result.IntVal = cast<ConstantInt>(C)->getValue();
break;
case Type::PointerTyID:
while (auto *A = dyn_cast<GlobalAlias>(C)) {
C = A->getAliasee();
}
if (isa<ConstantPointerNull>(C))
Result.PointerVal = nullptr;
else if (const Function *F = dyn_cast<Function>(C))
Result = PTOGV(getPointerToFunctionOrStub(const_cast<Function*>(F)));
else if (const GlobalVariable *GV = dyn_cast<GlobalVariable>(C))
Result = PTOGV(getOrEmitGlobalVariable(const_cast<GlobalVariable*>(GV)));
else
llvm_unreachable("Unknown constant pointer type!");
break;
case Type::ScalableVectorTyID:
report_fatal_error(
"Scalable vector support not yet implemented in ExecutionEngine");
case Type::FixedVectorTyID: {
unsigned elemNum;
Type* ElemTy;
const ConstantDataVector *CDV = dyn_cast<ConstantDataVector>(C);
const ConstantVector *CV = dyn_cast<ConstantVector>(C);
const ConstantAggregateZero *CAZ = dyn_cast<ConstantAggregateZero>(C);
if (CDV) {
elemNum = CDV->getNumElements();
ElemTy = CDV->getElementType();
} else if (CV || CAZ) {
auto *VTy = cast<FixedVectorType>(C->getType());
elemNum = VTy->getNumElements();
ElemTy = VTy->getElementType();
} else {
llvm_unreachable("Unknown constant vector type!");
}
Result.AggregateVal.resize(elemNum);
// Check if vector holds floats.
if(ElemTy->isFloatTy()) {
if (CAZ) {
GenericValue floatZero;
floatZero.FloatVal = 0.f;
std::fill(Result.AggregateVal.begin(), Result.AggregateVal.end(),
floatZero);
break;
}
if(CV) {
for (unsigned i = 0; i < elemNum; ++i)
if (!isa<UndefValue>(CV->getOperand(i)))
Result.AggregateVal[i].FloatVal = cast<ConstantFP>(
CV->getOperand(i))->getValueAPF().convertToFloat();
break;
}
if(CDV)
for (unsigned i = 0; i < elemNum; ++i)
Result.AggregateVal[i].FloatVal = CDV->getElementAsFloat(i);
break;
}
// Check if vector holds doubles.
if (ElemTy->isDoubleTy()) {
if (CAZ) {
GenericValue doubleZero;
doubleZero.DoubleVal = 0.0;
std::fill(Result.AggregateVal.begin(), Result.AggregateVal.end(),
doubleZero);
break;
}
if(CV) {
for (unsigned i = 0; i < elemNum; ++i)
if (!isa<UndefValue>(CV->getOperand(i)))
Result.AggregateVal[i].DoubleVal = cast<ConstantFP>(
CV->getOperand(i))->getValueAPF().convertToDouble();
break;
}
if(CDV)
for (unsigned i = 0; i < elemNum; ++i)
Result.AggregateVal[i].DoubleVal = CDV->getElementAsDouble(i);
break;
}
// Check if vector holds integers.
if (ElemTy->isIntegerTy()) {
if (CAZ) {
GenericValue intZero;
intZero.IntVal = APInt(ElemTy->getScalarSizeInBits(), 0ull);
std::fill(Result.AggregateVal.begin(), Result.AggregateVal.end(),
intZero);
break;
}
if(CV) {
for (unsigned i = 0; i < elemNum; ++i)
if (!isa<UndefValue>(CV->getOperand(i)))
Result.AggregateVal[i].IntVal = cast<ConstantInt>(
CV->getOperand(i))->getValue();
else {
Result.AggregateVal[i].IntVal =
APInt(CV->getOperand(i)->getType()->getPrimitiveSizeInBits(), 0);
}
break;
}
if(CDV)
for (unsigned i = 0; i < elemNum; ++i)
Result.AggregateVal[i].IntVal = APInt(
CDV->getElementType()->getPrimitiveSizeInBits(),
CDV->getElementAsInteger(i));
break;
}
llvm_unreachable("Unknown constant pointer type!");
} break;
default:
SmallString<256> Msg;
raw_svector_ostream OS(Msg);
OS << "ERROR: Constant unimplemented for type: " << *C->getType();
report_fatal_error(OS.str());
}
return Result;
}
void ExecutionEngine::StoreValueToMemory(const GenericValue &Val,
GenericValue *Ptr, Type *Ty) {
const unsigned StoreBytes = getDataLayout().getTypeStoreSize(Ty);
switch (Ty->getTypeID()) {
default:
dbgs() << "Cannot store value of type " << *Ty << "!\n";
break;
case Type::IntegerTyID:
StoreIntToMemory(Val.IntVal, (uint8_t*)Ptr, StoreBytes);
break;
case Type::FloatTyID:
*((float*)Ptr) = Val.FloatVal;
break;
case Type::DoubleTyID:
*((double*)Ptr) = Val.DoubleVal;
break;
case Type::X86_FP80TyID:
memcpy(Ptr, Val.IntVal.getRawData(), 10);
break;
case Type::PointerTyID:
// Ensure 64 bit target pointers are fully initialized on 32 bit hosts.
if (StoreBytes != sizeof(PointerTy))
memset(&(Ptr->PointerVal), 0, StoreBytes);
*((PointerTy*)Ptr) = Val.PointerVal;
break;
case Type::FixedVectorTyID:
case Type::ScalableVectorTyID:
for (unsigned i = 0; i < Val.AggregateVal.size(); ++i) {
if (cast<VectorType>(Ty)->getElementType()->isDoubleTy())
*(((double*)Ptr)+i) = Val.AggregateVal[i].DoubleVal;
if (cast<VectorType>(Ty)->getElementType()->isFloatTy())
*(((float*)Ptr)+i) = Val.AggregateVal[i].FloatVal;
if (cast<VectorType>(Ty)->getElementType()->isIntegerTy()) {
unsigned numOfBytes =(Val.AggregateVal[i].IntVal.getBitWidth()+7)/8;
StoreIntToMemory(Val.AggregateVal[i].IntVal,
(uint8_t*)Ptr + numOfBytes*i, numOfBytes);
}
}
break;
}
if (sys::IsLittleEndianHost != getDataLayout().isLittleEndian())
// Host and target are different endian - reverse the stored bytes.
std::reverse((uint8_t*)Ptr, StoreBytes + (uint8_t*)Ptr);
}
/// FIXME: document
///
void ExecutionEngine::LoadValueFromMemory(GenericValue &Result,
GenericValue *Ptr,
Type *Ty) {
const unsigned LoadBytes = getDataLayout().getTypeStoreSize(Ty);
switch (Ty->getTypeID()) {
case Type::IntegerTyID:
// An APInt with all words initially zero.
Result.IntVal = APInt(cast<IntegerType>(Ty)->getBitWidth(), 0);
LoadIntFromMemory(Result.IntVal, (uint8_t*)Ptr, LoadBytes);
break;
case Type::FloatTyID:
Result.FloatVal = *((float*)Ptr);
break;
case Type::DoubleTyID:
Result.DoubleVal = *((double*)Ptr);
break;
case Type::PointerTyID:
Result.PointerVal = *((PointerTy*)Ptr);
break;
case Type::X86_FP80TyID: {
// This is endian dependent, but it will only work on x86 anyway.
// FIXME: Will not trap if loading a signaling NaN.
uint64_t y[2];
memcpy(y, Ptr, 10);
Result.IntVal = APInt(80, y);
break;
}
case Type::ScalableVectorTyID:
report_fatal_error(
"Scalable vector support not yet implemented in ExecutionEngine");
case Type::FixedVectorTyID: {
auto *VT = cast<FixedVectorType>(Ty);
Type *ElemT = VT->getElementType();
const unsigned numElems = VT->getNumElements();
if (ElemT->isFloatTy()) {
Result.AggregateVal.resize(numElems);
for (unsigned i = 0; i < numElems; ++i)
Result.AggregateVal[i].FloatVal = *((float*)Ptr+i);
}
if (ElemT->isDoubleTy()) {
Result.AggregateVal.resize(numElems);
for (unsigned i = 0; i < numElems; ++i)
Result.AggregateVal[i].DoubleVal = *((double*)Ptr+i);
}
if (ElemT->isIntegerTy()) {
GenericValue intZero;
const unsigned elemBitWidth = cast<IntegerType>(ElemT)->getBitWidth();
intZero.IntVal = APInt(elemBitWidth, 0);
Result.AggregateVal.resize(numElems, intZero);
for (unsigned i = 0; i < numElems; ++i)
LoadIntFromMemory(Result.AggregateVal[i].IntVal,
(uint8_t*)Ptr+((elemBitWidth+7)/8)*i, (elemBitWidth+7)/8);
}
break;
}
default:
SmallString<256> Msg;
raw_svector_ostream OS(Msg);
OS << "Cannot load value of type " << *Ty << "!";
report_fatal_error(OS.str());
}
}
void ExecutionEngine::InitializeMemory(const Constant *Init, void *Addr) {
LLVM_DEBUG(dbgs() << "JIT: Initializing " << Addr << " ");
LLVM_DEBUG(Init->dump());
if (isa<UndefValue>(Init))
return;
if (const ConstantVector *CP = dyn_cast<ConstantVector>(Init)) {
unsigned ElementSize =
getDataLayout().getTypeAllocSize(CP->getType()->getElementType());
for (unsigned i = 0, e = CP->getNumOperands(); i != e; ++i)
InitializeMemory(CP->getOperand(i), (char*)Addr+i*ElementSize);
return;
}
if (isa<ConstantAggregateZero>(Init)) {
memset(Addr, 0, (size_t)getDataLayout().getTypeAllocSize(Init->getType()));
return;
}
if (const ConstantArray *CPA = dyn_cast<ConstantArray>(Init)) {
unsigned ElementSize =
getDataLayout().getTypeAllocSize(CPA->getType()->getElementType());
for (unsigned i = 0, e = CPA->getNumOperands(); i != e; ++i)
InitializeMemory(CPA->getOperand(i), (char*)Addr+i*ElementSize);
return;
}
if (const ConstantStruct *CPS = dyn_cast<ConstantStruct>(Init)) {
const StructLayout *SL =
getDataLayout().getStructLayout(cast<StructType>(CPS->getType()));
for (unsigned i = 0, e = CPS->getNumOperands(); i != e; ++i)
InitializeMemory(CPS->getOperand(i), (char*)Addr+SL->getElementOffset(i));
return;
}
if (const ConstantDataSequential *CDS =
dyn_cast<ConstantDataSequential>(Init)) {
// CDS is already laid out in host memory order.
StringRef Data = CDS->getRawDataValues();
memcpy(Addr, Data.data(), Data.size());
return;
}
if (Init->getType()->isFirstClassType()) {
GenericValue Val = getConstantValue(Init);
StoreValueToMemory(Val, (GenericValue*)Addr, Init->getType());
return;
}
LLVM_DEBUG(dbgs() << "Bad Type: " << *Init->getType() << "\n");
llvm_unreachable("Unknown constant type to initialize memory with!");
}
/// EmitGlobals - Emit all of the global variables to memory, storing their
/// addresses into GlobalAddress. This must make sure to copy the contents of
/// their initializers into the memory.
void ExecutionEngine::emitGlobals() {
// Loop over all of the global variables in the program, allocating the memory
// to hold them. If there is more than one module, do a prepass over globals
// to figure out how the different modules should link together.
std::map<std::pair<std::string, Type*>,
const GlobalValue*> LinkedGlobalsMap;
if (Modules.size() != 1) {
for (unsigned m = 0, e = Modules.size(); m != e; ++m) {
Module &M = *Modules[m];
for (const auto &GV : M.globals()) {
if (GV.hasLocalLinkage() || GV.isDeclaration() ||
GV.hasAppendingLinkage() || !GV.hasName())
continue;// Ignore external globals and globals with internal linkage.
const GlobalValue *&GVEntry = LinkedGlobalsMap[std::make_pair(
std::string(GV.getName()), GV.getType())];
// If this is the first time we've seen this global, it is the canonical
// version.
if (!GVEntry) {
GVEntry = &GV;
continue;
}
// If the existing global is strong, never replace it.
if (GVEntry->hasExternalLinkage())
continue;
// Otherwise, we know it's linkonce/weak, replace it if this is a strong
// symbol. FIXME is this right for common?
if (GV.hasExternalLinkage() || GVEntry->hasExternalWeakLinkage())
GVEntry = &GV;
}
}
}
std::vector<const GlobalValue*> NonCanonicalGlobals;
for (unsigned m = 0, e = Modules.size(); m != e; ++m) {
Module &M = *Modules[m];
for (const auto &GV : M.globals()) {
// In the multi-module case, see what this global maps to.
if (!LinkedGlobalsMap.empty()) {
if (const GlobalValue *GVEntry = LinkedGlobalsMap[std::make_pair(
std::string(GV.getName()), GV.getType())]) {
// If something else is the canonical global, ignore this one.
if (GVEntry != &GV) {
NonCanonicalGlobals.push_back(&GV);
continue;
}
}
}
if (!GV.isDeclaration()) {
addGlobalMapping(&GV, getMemoryForGV(&GV));
} else {
// External variable reference. Try to use the dynamic loader to
// get a pointer to it.
if (void *SymAddr = sys::DynamicLibrary::SearchForAddressOfSymbol(
std::string(GV.getName())))
addGlobalMapping(&GV, SymAddr);
else {
report_fatal_error("Could not resolve external global address: "
+GV.getName());
}
}
}
// If there are multiple modules, map the non-canonical globals to their
// canonical location.
if (!NonCanonicalGlobals.empty()) {
for (unsigned i = 0, e = NonCanonicalGlobals.size(); i != e; ++i) {
const GlobalValue *GV = NonCanonicalGlobals[i];
const GlobalValue *CGV = LinkedGlobalsMap[std::make_pair(
std::string(GV->getName()), GV->getType())];
void *Ptr = getPointerToGlobalIfAvailable(CGV);
assert(Ptr && "Canonical global wasn't codegen'd!");
addGlobalMapping(GV, Ptr);
}
}
// Now that all of the globals are set up in memory, loop through them all
// and initialize their contents.
for (const auto &GV : M.globals()) {
if (!GV.isDeclaration()) {
if (!LinkedGlobalsMap.empty()) {
if (const GlobalValue *GVEntry = LinkedGlobalsMap[std::make_pair(
std::string(GV.getName()), GV.getType())])
if (GVEntry != &GV) // Not the canonical variable.
continue;
}
emitGlobalVariable(&GV);
}
}
}
}
// EmitGlobalVariable - This method emits the specified global variable to the
// address specified in GlobalAddresses, or allocates new memory if it's not
// already in the map.
void ExecutionEngine::emitGlobalVariable(const GlobalVariable *GV) {
void *GA = getPointerToGlobalIfAvailable(GV);
if (!GA) {
// If it's not already specified, allocate memory for the global.
GA = getMemoryForGV(GV);
// If we failed to allocate memory for this global, return.
if (!GA) return;
addGlobalMapping(GV, GA);
}
// Don't initialize if it's thread local, let the client do it.
if (!GV->isThreadLocal())
InitializeMemory(GV->getInitializer(), GA);
Type *ElTy = GV->getValueType();
size_t GVSize = (size_t)getDataLayout().getTypeAllocSize(ElTy);
NumInitBytes += (unsigned)GVSize;
++NumGlobals;
}
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