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llvm-6502/lib/ExecutionEngine/ExecutionEngine.cpp
Nick Lewycky 5ea5c61589 Just because a GlobalVariable's initializer is [N x { i32, void ()* }] doesn't 
mean that it has to be ConstantArray of ConstantStruct. We might have
ConstantAggregateZero, at either level, so don't crash on that.

Also, semi-deprecate the sentinal value. The linker isn't aware of sentinals so
we end up with the two lists appended, each with their "sentinals" on them.
Different parts of LLVM treated sentinals differently, so make them all just
ignore the single entry and continue on with the rest of the list.


git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@129307 91177308-0d34-0410-b5e6-96231b3b80d8
2011-04-11 22:11:20 +00:00

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//===-- ExecutionEngine.cpp - Common Implementation shared by EEs ---------===//
//
// The LLVM Compiler Infrastructure
//
// This file is distributed under the University of Illinois Open Source
// License. See LICENSE.TXT for details.
//
//===----------------------------------------------------------------------===//
//
// This file defines the common interface used by the various execution engine
// subclasses.
//
//===----------------------------------------------------------------------===//
#define DEBUG_TYPE "jit"
#include "llvm/ExecutionEngine/ExecutionEngine.h"
#include "llvm/Constants.h"
#include "llvm/DerivedTypes.h"
#include "llvm/Module.h"
#include "llvm/ExecutionEngine/GenericValue.h"
#include "llvm/ADT/SmallString.h"
#include "llvm/ADT/Statistic.h"
#include "llvm/Support/Debug.h"
#include "llvm/Support/ErrorHandling.h"
#include "llvm/Support/MutexGuard.h"
#include "llvm/Support/ValueHandle.h"
#include "llvm/Support/raw_ostream.h"
#include "llvm/Support/DynamicLibrary.h"
#include "llvm/Support/Host.h"
#include "llvm/Target/TargetData.h"
#include <cmath>
#include <cstring>
using namespace llvm;
STATISTIC(NumInitBytes, "Number of bytes of global vars initialized");
STATISTIC(NumGlobals , "Number of global vars initialized");
ExecutionEngine *(*ExecutionEngine::JITCtor)(
Module *M,
std::string *ErrorStr,
JITMemoryManager *JMM,
CodeGenOpt::Level OptLevel,
bool GVsWithCode,
CodeModel::Model CMM,
StringRef MArch,
StringRef MCPU,
const SmallVectorImpl<std::string>& MAttrs) = 0;
ExecutionEngine *(*ExecutionEngine::MCJITCtor)(
Module *M,
std::string *ErrorStr,
JITMemoryManager *JMM,
CodeGenOpt::Level OptLevel,
bool GVsWithCode,
CodeModel::Model CMM,
StringRef MArch,
StringRef MCPU,
const SmallVectorImpl<std::string>& MAttrs) = 0;
ExecutionEngine *(*ExecutionEngine::InterpCtor)(Module *M,
std::string *ErrorStr) = 0;
ExecutionEngine::ExecutionEngine(Module *M)
: EEState(*this),
LazyFunctionCreator(0),
ExceptionTableRegister(0),
ExceptionTableDeregister(0) {
CompilingLazily = false;
GVCompilationDisabled = false;
SymbolSearchingDisabled = false;
Modules.push_back(M);
assert(M && "Module is null?");
}
ExecutionEngine::~ExecutionEngine() {
clearAllGlobalMappings();
for (unsigned i = 0, e = Modules.size(); i != e; ++i)
delete Modules[i];
}
void ExecutionEngine::DeregisterAllTables() {
if (ExceptionTableDeregister) {
DenseMap<const Function*, void*>::iterator it = AllExceptionTables.begin();
DenseMap<const Function*, void*>::iterator ite = AllExceptionTables.end();
for (; it != ite; ++it)
ExceptionTableDeregister(it->second);
AllExceptionTables.clear();
}
}
namespace {
/// \brief Helper class which uses a value handler to automatically deletes the
/// memory block when the GlobalVariable is destroyed.
class GVMemoryBlock : public CallbackVH {
GVMemoryBlock(const GlobalVariable *GV)
: CallbackVH(const_cast<GlobalVariable*>(GV)) {}
public:
/// \brief Returns the address the GlobalVariable should be written into. The
/// GVMemoryBlock object prefixes that.
static char *Create(const GlobalVariable *GV, const TargetData& TD) {
const Type *ElTy = GV->getType()->getElementType();
size_t GVSize = (size_t)TD.getTypeAllocSize(ElTy);
void *RawMemory = ::operator new(
TargetData::RoundUpAlignment(sizeof(GVMemoryBlock),
TD.getPreferredAlignment(GV))
+ GVSize);
new(RawMemory) GVMemoryBlock(GV);
return static_cast<char*>(RawMemory) + sizeof(GVMemoryBlock);
}
virtual void deleted() {
// 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, *getTargetData());
}
bool ExecutionEngine::removeModule(Module *M) {
for(SmallVector<Module *, 1>::iterator I = Modules.begin(),
E = Modules.end(); I != E; ++I) {
Module *Found = *I;
if (Found == M) {
Modules.erase(I);
clearGlobalMappingsFromModule(M);
return true;
}
}
return false;
}
Function *ExecutionEngine::FindFunctionNamed(const char *FnName) {
for (unsigned i = 0, e = Modules.size(); i != e; ++i) {
if (Function *F = Modules[i]->getFunction(FnName))
return F;
}
return 0;
}
void *ExecutionEngineState::RemoveMapping(const MutexGuard &,
const GlobalValue *ToUnmap) {
GlobalAddressMapTy::iterator I = GlobalAddressMap.find(ToUnmap);
void *OldVal;
// FIXME: This is silly, we shouldn't end up with a mapping -> 0 in the
// GlobalAddressMap.
if (I == GlobalAddressMap.end())
OldVal = 0;
else {
OldVal = I->second;
GlobalAddressMap.erase(I);
}
GlobalAddressReverseMap.erase(OldVal);
return OldVal;
}
void ExecutionEngine::addGlobalMapping(const GlobalValue *GV, void *Addr) {
MutexGuard locked(lock);
DEBUG(dbgs() << "JIT: Map \'" << GV->getName()
<< "\' to [" << Addr << "]\n";);
void *&CurVal = EEState.getGlobalAddressMap(locked)[GV];
assert((CurVal == 0 || Addr == 0) && "GlobalMapping already established!");
CurVal = Addr;
// If we are using the reverse mapping, add it too.
if (!EEState.getGlobalAddressReverseMap(locked).empty()) {
AssertingVH<const GlobalValue> &V =
EEState.getGlobalAddressReverseMap(locked)[Addr];
assert((V == 0 || GV == 0) && "GlobalMapping already established!");
V = GV;
}
}
void ExecutionEngine::clearAllGlobalMappings() {
MutexGuard locked(lock);
EEState.getGlobalAddressMap(locked).clear();
EEState.getGlobalAddressReverseMap(locked).clear();
}
void ExecutionEngine::clearGlobalMappingsFromModule(Module *M) {
MutexGuard locked(lock);
for (Module::iterator FI = M->begin(), FE = M->end(); FI != FE; ++FI)
EEState.RemoveMapping(locked, FI);
for (Module::global_iterator GI = M->global_begin(), GE = M->global_end();
GI != GE; ++GI)
EEState.RemoveMapping(locked, GI);
}
void *ExecutionEngine::updateGlobalMapping(const GlobalValue *GV, void *Addr) {
MutexGuard locked(lock);
ExecutionEngineState::GlobalAddressMapTy &Map =
EEState.getGlobalAddressMap(locked);
// Deleting from the mapping?
if (Addr == 0)
return EEState.RemoveMapping(locked, GV);
void *&CurVal = Map[GV];
void *OldVal = CurVal;
if (CurVal && !EEState.getGlobalAddressReverseMap(locked).empty())
EEState.getGlobalAddressReverseMap(locked).erase(CurVal);
CurVal = Addr;
// If we are using the reverse mapping, add it too.
if (!EEState.getGlobalAddressReverseMap(locked).empty()) {
AssertingVH<const GlobalValue> &V =
EEState.getGlobalAddressReverseMap(locked)[Addr];
assert((V == 0 || GV == 0) && "GlobalMapping already established!");
V = GV;
}
return OldVal;
}
void *ExecutionEngine::getPointerToGlobalIfAvailable(const GlobalValue *GV) {
MutexGuard locked(lock);
ExecutionEngineState::GlobalAddressMapTy::iterator I =
EEState.getGlobalAddressMap(locked).find(GV);
return I != EEState.getGlobalAddressMap(locked).end() ? I->second : 0;
}
const GlobalValue *ExecutionEngine::getGlobalValueAtAddress(void *Addr) {
MutexGuard locked(lock);
// If we haven't computed the reverse mapping yet, do so first.
if (EEState.getGlobalAddressReverseMap(locked).empty()) {
for (ExecutionEngineState::GlobalAddressMapTy::iterator
I = EEState.getGlobalAddressMap(locked).begin(),
E = EEState.getGlobalAddressMap(locked).end(); I != E; ++I)
EEState.getGlobalAddressReverseMap(locked).insert(std::make_pair(
I->second, I->first));
}
std::map<void *, AssertingVH<const GlobalValue> >::iterator I =
EEState.getGlobalAddressReverseMap(locked).find(Addr);
return I != EEState.getGlobalAddressReverseMap(locked).end() ? I->second : 0;
}
namespace {
class ArgvArray {
char *Array;
std::vector<char*> Values;
public:
ArgvArray() : Array(NULL) {}
~ArgvArray() { clear(); }
void clear() {
delete[] Array;
Array = NULL;
for (size_t I = 0, E = Values.size(); I != E; ++I) {
delete[] Values[I];
}
Values.clear();
}
/// 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) {
clear(); // Free the old contents.
unsigned PtrSize = EE->getTargetData()->getPointerSize();
Array = new char[(InputArgv.size()+1)*PtrSize];
DEBUG(dbgs() << "JIT: ARGV = " << (void*)Array << "\n");
const Type *SBytePtr = Type::getInt8PtrTy(C);
for (unsigned i = 0; i != InputArgv.size(); ++i) {
unsigned Size = InputArgv[i].size()+1;
char *Dest = new char[Size];
Values.push_back(Dest);
DEBUG(dbgs() << "JIT: ARGV[" << i << "] = " << (void*)Dest << "\n");
std::copy(InputArgv[i].begin(), InputArgv[i].end(), Dest);
Dest[Size-1] = 0;
// Endian safe: Array[i] = (PointerTy)Dest;
EE->StoreValueToMemory(PTOGV(Dest), (GenericValue*)(Array+i*PtrSize),
SBytePtr);
}
// Null terminate it
EE->StoreValueToMemory(PTOGV(0),
(GenericValue*)(Array+InputArgv.size()*PtrSize),
SBytePtr);
return Array;
}
void ExecutionEngine::runStaticConstructorsDestructors(Module *module,
bool isDtors) {
const char *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.
if (isa<ConstantAggregateZero>(GV->getInitializer()))
return;
ConstantArray *InitList = cast<ConstantArray>(GV->getInitializer());
for (unsigned i = 0, e = InitList->getNumOperands(); i != e; ++i) {
if (isa<ConstantAggregateZero>(InitList->getOperand(i)))
continue;
ConstantStruct *CS = cast<ConstantStruct>(InitList->getOperand(i));
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, std::vector<GenericValue>());
// 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 (unsigned i = 0, e = Modules.size(); i != e; ++i)
runStaticConstructorsDestructors(Modules[i], isDtors);
}
#ifndef NDEBUG
/// isTargetNullPtr - Return whether the target pointer stored at Loc is null.
static bool isTargetNullPtr(ExecutionEngine *EE, void *Loc) {
unsigned PtrSize = EE->getTargetData()->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();
const FunctionType *FTy = Fn->getFunctionType();
const 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.push_back(envp[i]);
// Arg #2 = envp.
GVArgs.push_back(PTOGV(CEnv.reset(Fn->getContext(), this, EnvVars)));
}
}
}
return runFunction(Fn, GVArgs).IntVal.getZExtValue();
}
ExecutionEngine *ExecutionEngine::create(Module *M,
bool ForceInterpreter,
std::string *ErrorStr,
CodeGenOpt::Level OptLevel,
bool GVsWithCode) {
return EngineBuilder(M)
.setEngineKind(ForceInterpreter
? EngineKind::Interpreter
: EngineKind::JIT)
.setErrorStr(ErrorStr)
.setOptLevel(OptLevel)
.setAllocateGVsWithCode(GVsWithCode)
.create();
}
ExecutionEngine *EngineBuilder::create() {
// 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(0, ErrorStr))
return 0;
// 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 (JMM) {
if (WhichEngine & EngineKind::JIT)
WhichEngine = EngineKind::JIT;
else {
if (ErrorStr)
*ErrorStr = "Cannot create an interpreter with a memory manager.";
return 0;
}
}
// Unless the interpreter was explicitly selected or the JIT is not linked,
// try making a JIT.
if (WhichEngine & EngineKind::JIT) {
if (UseMCJIT && ExecutionEngine::MCJITCtor) {
ExecutionEngine *EE =
ExecutionEngine::MCJITCtor(M, ErrorStr, JMM, OptLevel,
AllocateGVsWithCode, CMModel,
MArch, MCPU, MAttrs);
if (EE) return EE;
} else if (ExecutionEngine::JITCtor) {
ExecutionEngine *EE =
ExecutionEngine::JITCtor(M, ErrorStr, JMM, OptLevel,
AllocateGVsWithCode, CMModel,
MArch, MCPU, MAttrs);
if (EE) 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(M, ErrorStr);
if (ErrorStr)
*ErrorStr = "Interpreter has not been linked in.";
return 0;
}
if ((WhichEngine & EngineKind::JIT) && ExecutionEngine::JITCtor == 0) {
if (ErrorStr)
*ErrorStr = "JIT has not been linked in.";
}
return 0;
}
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 = EEState.getGlobalAddressMap(locked)[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 EEState.getGlobalAddressMap(locked)[GV];
}
/// \brief 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()) {
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;
default:
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);
SmallVector<Value*, 8> Indices(CE->op_begin()+1, CE->op_end());
uint64_t Offset =
TD->getIndexedOffset(Op0->getType(), &Indices[0], Indices.size());
char* tmp = (char*) Result.PointerVal;
Result = PTOGV(tmp + Offset);
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(GV.IntVal);
uint64_t v;
bool ignored;
(void)apf.convertToInteger(&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 = TD->getPointerSizeInBits();
GV.IntVal = APInt(PtrWidth, uintptr_t(GV.PointerVal));
return GV;
}
case Instruction::IntToPtr: {
GenericValue GV = getConstantValue(Op0);
uint32_t PtrWidth = TD->getPointerSizeInBits();
if (PtrWidth != GV.IntVal.getBitWidth())
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);
const 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: {
APFloat apfLHS = APFloat(LHS.IntVal);
switch (CE->getOpcode()) {
default: llvm_unreachable("Invalid long double opcode");
case Instruction::FAdd:
apfLHS.add(APFloat(RHS.IntVal), APFloat::rmNearestTiesToEven);
GV.IntVal = apfLHS.bitcastToAPInt();
break;
case Instruction::FSub:
apfLHS.subtract(APFloat(RHS.IntVal), APFloat::rmNearestTiesToEven);
GV.IntVal = apfLHS.bitcastToAPInt();
break;
case Instruction::FMul:
apfLHS.multiply(APFloat(RHS.IntVal), APFloat::rmNearestTiesToEven);
GV.IntVal = apfLHS.bitcastToAPInt();
break;
case Instruction::FDiv:
apfLHS.divide(APFloat(RHS.IntVal), APFloat::rmNearestTiesToEven);
GV.IntVal = apfLHS.bitcastToAPInt();
break;
case Instruction::FRem:
apfLHS.mod(APFloat(RHS.IntVal), APFloat::rmNearestTiesToEven);
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:
if (isa<ConstantPointerNull>(C))
Result.PointerVal = 0;
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 if (const BlockAddress *BA = dyn_cast<BlockAddress>(C))
Result = PTOGV(getPointerToBasicBlock(const_cast<BasicBlock*>(
BA->getBasicBlock())));
else
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!");
uint8_t *Src = (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, const Type *Ty) {
const unsigned StoreBytes = getTargetData()->getTypeStoreSize(Ty);
switch (Ty->getTypeID()) {
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, 0, StoreBytes);
*((PointerTy*)Ptr) = Val.PointerVal;
break;
default:
dbgs() << "Cannot store value of type " << *Ty << "!\n";
}
if (sys::isLittleEndianHost() != getTargetData()->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 = (uint8_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,
const Type *Ty) {
const unsigned LoadBytes = getTargetData()->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, 2, y);
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) {
DEBUG(dbgs() << "JIT: Initializing " << Addr << " ");
DEBUG(Init->dump());
if (isa<UndefValue>(Init)) {
return;
} else if (const ConstantVector *CP = dyn_cast<ConstantVector>(Init)) {
unsigned ElementSize =
getTargetData()->getTypeAllocSize(CP->getType()->getElementType());
for (unsigned i = 0, e = CP->getNumOperands(); i != e; ++i)
InitializeMemory(CP->getOperand(i), (char*)Addr+i*ElementSize);
return;
} else if (isa<ConstantAggregateZero>(Init)) {
memset(Addr, 0, (size_t)getTargetData()->getTypeAllocSize(Init->getType()));
return;
} else if (const ConstantArray *CPA = dyn_cast<ConstantArray>(Init)) {
unsigned ElementSize =
getTargetData()->getTypeAllocSize(CPA->getType()->getElementType());
for (unsigned i = 0, e = CPA->getNumOperands(); i != e; ++i)
InitializeMemory(CPA->getOperand(i), (char*)Addr+i*ElementSize);
return;
} else if (const ConstantStruct *CPS = dyn_cast<ConstantStruct>(Init)) {
const StructLayout *SL =
getTargetData()->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;
} else if (Init->getType()->isFirstClassType()) {
GenericValue Val = getConstantValue(Init);
StoreValueToMemory(Val, (GenericValue*)Addr, Init->getType());
return;
}
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, const Type*>,
const GlobalValue*> LinkedGlobalsMap;
if (Modules.size() != 1) {
for (unsigned m = 0, e = Modules.size(); m != e; ++m) {
Module &M = *Modules[m];
for (Module::const_global_iterator I = M.global_begin(),
E = M.global_end(); I != E; ++I) {
const GlobalValue *GV = I;
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() ||
GVEntry->hasDLLImportLinkage() ||
GVEntry->hasDLLExportLinkage())
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 (Module::const_global_iterator I = M.global_begin(), E = M.global_end();
I != E; ++I) {
// In the multi-module case, see what this global maps to.
if (!LinkedGlobalsMap.empty()) {
if (const GlobalValue *GVEntry =
LinkedGlobalsMap[std::make_pair(I->getName(), I->getType())]) {
// If something else is the canonical global, ignore this one.
if (GVEntry != &*I) {
NonCanonicalGlobals.push_back(I);
continue;
}
}
}
if (!I->isDeclaration()) {
addGlobalMapping(I, getMemoryForGV(I));
} else {
// External variable reference. Try to use the dynamic loader to
// get a pointer to it.
if (void *SymAddr =
sys::DynamicLibrary::SearchForAddressOfSymbol(I->getName()))
addGlobalMapping(I, SymAddr);
else {
report_fatal_error("Could not resolve external global address: "
+I->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 (Module::const_global_iterator I = M.global_begin(), E = M.global_end();
I != E; ++I) {
if (!I->isDeclaration()) {
if (!LinkedGlobalsMap.empty()) {
if (const GlobalValue *GVEntry =
LinkedGlobalsMap[std::make_pair(I->getName(), I->getType())])
if (GVEntry != &*I) // Not the canonical variable.
continue;
}
EmitGlobalVariable(I);
}
}
}
}
// 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 == 0) {
// If it's not already specified, allocate memory for the global.
GA = getMemoryForGV(GV);
addGlobalMapping(GV, GA);
}
// Don't initialize if it's thread local, let the client do it.
if (!GV->isThreadLocal())
InitializeMemory(GV->getInitializer(), GA);
const Type *ElTy = GV->getType()->getElementType();
size_t GVSize = (size_t)getTargetData()->getTypeAllocSize(ElTy);
NumInitBytes += (unsigned)GVSize;
++NumGlobals;
}
ExecutionEngineState::ExecutionEngineState(ExecutionEngine &EE)
: EE(EE), GlobalAddressMap(this) {
}
sys::Mutex *
ExecutionEngineState::AddressMapConfig::getMutex(ExecutionEngineState *EES) {
return &EES->EE.lock;
}
void ExecutionEngineState::AddressMapConfig::onDelete(ExecutionEngineState *EES,
const GlobalValue *Old) {
void *OldVal = EES->GlobalAddressMap.lookup(Old);
EES->GlobalAddressReverseMap.erase(OldVal);
}
void ExecutionEngineState::AddressMapConfig::onRAUW(ExecutionEngineState *,
const GlobalValue *,
const GlobalValue *) {
assert(false && "The ExecutionEngine doesn't know how to handle a"
" RAUW on a value it has a global mapping for.");
}
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