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//===-- LlvmState.cpp -------------------------------------------*- C++ -*-===//
//
// 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
//
//===----------------------------------------------------------------------===//
#include "LlvmState.h"
#include "Target.h"
#include "llvm/ADT/SmallVector.h"
#include "llvm/MC/MCCodeEmitter.h"
#include "llvm/MC/MCContext.h"
#include "llvm/MC/MCFixup.h"
#include "llvm/MC/MCObjectFileInfo.h"
#include "llvm/Support/Host.h"
#include "llvm/Support/TargetRegistry.h"
#include "llvm/Support/raw_ostream.h"
#include "llvm/Target/TargetMachine.h"
#include "llvm/Target/TargetOptions.h"
namespace llvm {
namespace exegesis {
LLVMState::LLVMState(const std::string &Triple, const std::string &CpuName,
const std::string &Features) {
std::string Error;
const Target *const TheTarget = TargetRegistry::lookupTarget(Triple, Error);
assert(TheTarget && "unknown target for host");
const TargetOptions Options;
TheTargetMachine.reset(
static_cast<LLVMTargetMachine *>(TheTarget->createTargetMachine(
Triple, CpuName, Features, Options, Reloc::Model::Static)));
assert(TheTargetMachine && "unable to create target machine");
TheExegesisTarget = ExegesisTarget::lookup(TheTargetMachine->getTargetTriple());
if (!TheExegesisTarget) {
errs() << "no exegesis target for " << Triple << ", using default\n";
TheExegesisTarget = &ExegesisTarget::getDefault();
}
PfmCounters = &TheExegesisTarget->getPfmCounters(CpuName);
BitVector ReservedRegs = getFunctionReservedRegs(getTargetMachine());
for (const unsigned Reg : TheExegesisTarget->getUnavailableRegisters())
ReservedRegs.set(Reg);
RATC.reset(
new RegisterAliasingTrackerCache(getRegInfo(), std::move(ReservedRegs)));
IC.reset(new InstructionsCache(getInstrInfo(), getRATC()));
}
LLVMState::LLVMState(const std::string &CpuName)
: LLVMState(sys::getProcessTriple(),
CpuName.empty() ? sys::getHostCPUName().str() : CpuName, "") {}
std::unique_ptr<LLVMTargetMachine> LLVMState::createTargetMachine() const {
return std::unique_ptr<LLVMTargetMachine>(static_cast<LLVMTargetMachine *>(
TheTargetMachine->getTarget().createTargetMachine(
TheTargetMachine->getTargetTriple().normalize(),
TheTargetMachine->getTargetCPU(),
TheTargetMachine->getTargetFeatureString(), TheTargetMachine->Options,
Reloc::Model::Static)));
}
bool LLVMState::canAssemble(const MCInst &Inst) const {
MCObjectFileInfo ObjectFileInfo;
MCContext Context(TheTargetMachine->getMCAsmInfo(),
TheTargetMachine->getMCRegisterInfo(), &ObjectFileInfo);
std::unique_ptr<const MCCodeEmitter> CodeEmitter(
TheTargetMachine->getTarget().createMCCodeEmitter(
*TheTargetMachine->getMCInstrInfo(), *TheTargetMachine->getMCRegisterInfo(),
Context));
assert(CodeEmitter && "unable to create code emitter");
SmallVector<char, 16> Tmp;
raw_svector_ostream OS(Tmp);
SmallVector<MCFixup, 4> Fixups;
CodeEmitter->encodeInstruction(Inst, OS, Fixups,
*TheTargetMachine->getMCSubtargetInfo());
return Tmp.size() > 0;
}
} // namespace exegesis
} // namespace llvm
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