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llvm-mirror/lib/ExecutionEngine/ExecutionEngine.cpp
Chandler Carruth ae65e281f3 Update the file headers across all of the LLVM projects in the monorepo 
to reflect the new license.

We understand that people may be surprised that we're moving the header
entirely to discuss the new license. We checked this carefully with the
Foundation's lawyer and we believe this is the correct approach.

Essentially, all code in the project is now made available by the LLVM
project under our new license, so you will see that the license headers
include that license only. Some of our contributors have contributed
code under our old license, and accordingly, we have retained a copy of
our old license notice in the top-level files in each project and
repository.

llvm-svn: 351636
2019-01-19 08:50:56 +00:00

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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.
//
//===----------------------------------------------------------------------===//
#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/MutexGuard.h"
#include "llvm/Support/TargetRegistry.h"
#include "llvm/Support/raw_ostream.h"
#include "llvm/Target/TargetMachine.h"
#include <cmath>
#include <cstring>
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::OrcMCJITReplacementCtor)(
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.getPreferredAlignment(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.");
MutexGuard locked(lock);
SmallString<128> FullName;
const DataLayout &DL =
GV->getParent()->getDataLayout().isDefault()
? getDataLayout()
: GV->getParent()->getDataLayout();
Mangler::getNameWithPrefix(FullName, GV->getName(), DL);
return FullName.str();
}
void ExecutionEngine::addGlobalMapping(const GlobalValue *GV, void *Addr) {
MutexGuard locked(lock);
addGlobalMapping(getMangledName(GV), (uint64_t) Addr);
}
void ExecutionEngine::addGlobalMapping(StringRef Name, uint64_t Addr) {
MutexGuard 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 = Name;
}
}
void ExecutionEngine::clearAllGlobalMappings() {
MutexGuard locked(lock);
EEState.getGlobalAddressMap().clear();
EEState.getGlobalAddressReverseMap().clear();
}
void ExecutionEngine::clearGlobalMappingsFromModule(Module *M) {
MutexGuard locked(lock);
for (GlobalObject &GO : M->global_objects())
EEState.RemoveMapping(getMangledName(&GO));
}
uint64_t ExecutionEngine::updateGlobalMapping(const GlobalValue *GV,
void *Addr) {
MutexGuard locked(lock);
return updateGlobalMapping(getMangledName(GV), (uint64_t) Addr);
}
uint64_t ExecutionEngine::updateGlobalMapping(StringRef Name, uint64_t Addr) {
MutexGuard 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 = Name;
}
return OldVal;
}
uint64_t ExecutionEngine::getAddressToGlobalIfAvailable(StringRef S) {
MutexGuard 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) {
MutexGuard locked(lock);
if (void* Address = (void *) getAddressToGlobalIfAvailable(S))
return Address;
return nullptr;
}
void *ExecutionEngine::getPointerToGlobalIfAvailable(const GlobalValue *GV) {
MutexGuard locked(lock);
return getPointerToGlobalIfAvailable(getMangledName(GV));
}
const GlobalValue *ExecutionEngine::getGlobalValueAtAddress(void *Addr) {
MutexGuard 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, 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 = 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 = 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),
UseOrcMCJITReplacement(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
}
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::OrcMCJITReplacementCtor && UseOrcMCJITReplacement) {
EE = ExecutionEngine::OrcMCJITReplacementCtor(ErrorStr, std::move(MemMgr),
std::move(Resolver),
std::move(TheTM));
EE->addModule(std::move(M));
} else 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);
MutexGuard 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::VectorTyID:
// if the whole vector is 'undef' just reserve memory for the value.
auto* VTy = dyn_cast<VectorType>(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::VectorTyID: {
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) {
VectorType* VTy = dyn_cast<VectorType>(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;
}
/// StoreIntToMemory - Fills the StoreBytes bytes of memory starting from Dst
/// with the integer held in IntVal.
static void StoreIntToMemory(const APInt &IntVal, uint8_t *Dst,
unsigned StoreBytes) {
assert((IntVal.getBitWidth()+7)/8 >= StoreBytes && "Integer too small!");
const uint8_t *Src = (const uint8_t *)IntVal.getRawData();
if (sys::IsLittleEndianHost) {
// Little-endian host - the source is ordered from LSB to MSB. Order the
// destination from LSB to MSB: Do a straight copy.
memcpy(Dst, Src, StoreBytes);
} else {
// Big-endian host - the source is an array of 64 bit words ordered from
// LSW to MSW. Each word is ordered from MSB to LSB. Order the destination
// from MSB to LSB: Reverse the word order, but not the bytes in a word.
while (StoreBytes > sizeof(uint64_t)) {
StoreBytes -= sizeof(uint64_t);
// May not be aligned so use memcpy.
memcpy(Dst + StoreBytes, Src, sizeof(uint64_t));
Src += sizeof(uint64_t);
}
memcpy(Dst, Src + sizeof(uint64_t) - StoreBytes, StoreBytes);
}
}
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::VectorTyID:
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);
}
/// LoadIntFromMemory - Loads the integer stored in the LoadBytes bytes starting
/// from Src into IntVal, which is assumed to be wide enough and to hold zero.
static void LoadIntFromMemory(APInt &IntVal, uint8_t *Src, unsigned LoadBytes) {
assert((IntVal.getBitWidth()+7)/8 >= LoadBytes && "Integer too small!");
uint8_t *Dst = reinterpret_cast<uint8_t *>(
const_cast<uint64_t *>(IntVal.getRawData()));
if (sys::IsLittleEndianHost)
// Little-endian host - the destination must be ordered from LSB to MSB.
// The source is ordered from LSB to MSB: Do a straight copy.
memcpy(Dst, Src, LoadBytes);
else {
// Big-endian - the destination is an array of 64 bit words ordered from
// LSW to MSW. Each word must be ordered from MSB to LSB. The source is
// ordered from MSB to LSB: Reverse the word order, but not the bytes in
// a word.
while (LoadBytes > sizeof(uint64_t)) {
LoadBytes -= sizeof(uint64_t);
// May not be aligned so use memcpy.
memcpy(Dst, Src + LoadBytes, sizeof(uint64_t));
Dst += sizeof(uint64_t);
}
memcpy(Dst + sizeof(uint64_t) - LoadBytes, Src, LoadBytes);
}
}
/// 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::VectorTyID: {
auto *VT = cast<VectorType>(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(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(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(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(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(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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