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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/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 llvm::Target *const TheTarget =
llvm::TargetRegistry::lookupTarget(Triple, Error);
assert(TheTarget && "unknown target for host");
const llvm::TargetOptions Options;
TargetMachine.reset(
static_cast<llvm::LLVMTargetMachine *>(TheTarget->createTargetMachine(
Triple, CpuName, Features, Options, llvm::Reloc::Model::Static)));
TheExegesisTarget = ExegesisTarget::lookup(TargetMachine->getTargetTriple());
if (!TheExegesisTarget) {
llvm::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(llvm::sys::getProcessTriple(),
CpuName.empty() ? llvm::sys::getHostCPUName().str() : CpuName,
"") {}
std::unique_ptr<llvm::LLVMTargetMachine>
LLVMState::createTargetMachine() const {
return std::unique_ptr<llvm::LLVMTargetMachine>(
static_cast<llvm::LLVMTargetMachine *>(
TargetMachine->getTarget().createTargetMachine(
TargetMachine->getTargetTriple().normalize(),
TargetMachine->getTargetCPU(),
TargetMachine->getTargetFeatureString(), TargetMachine->Options,
llvm::Reloc::Model::Static)));
}
bool LLVMState::canAssemble(const llvm::MCInst &Inst) const {
llvm::MCObjectFileInfo ObjectFileInfo;
llvm::MCContext Context(TargetMachine->getMCAsmInfo(),
TargetMachine->getMCRegisterInfo(), &ObjectFileInfo);
std::unique_ptr<const llvm::MCCodeEmitter> CodeEmitter(
TargetMachine->getTarget().createMCCodeEmitter(
*TargetMachine->getMCInstrInfo(), *TargetMachine->getMCRegisterInfo(),
Context));
llvm::SmallVector<char, 16> Tmp;
llvm::raw_svector_ostream OS(Tmp);
llvm::SmallVector<llvm::MCFixup, 4> Fixups;
CodeEmitter->encodeInstruction(Inst, OS, Fixups,
*TargetMachine->getMCSubtargetInfo());
return Tmp.size() > 0;
}
} // namespace exegesis
} // namespace llvm
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