forked from OSchip/llvm-project
80 lines
3.2 KiB
C++
80 lines
3.2 KiB
C++
//===-- 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)));
|
|
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));
|
|
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
|