84 lines
2.6 KiB
C++
84 lines
2.6 KiB
C++
//=-- BPFMCInstLower.cpp - Convert BPF MachineInstr to an MCInst ------------=//
|
|
//
|
|
// 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 contains code to lower BPF MachineInstrs to their corresponding
|
|
// MCInst records.
|
|
//
|
|
//===----------------------------------------------------------------------===//
|
|
|
|
#include "BPFMCInstLower.h"
|
|
#include "llvm/CodeGen/AsmPrinter.h"
|
|
#include "llvm/CodeGen/MachineBasicBlock.h"
|
|
#include "llvm/CodeGen/MachineInstr.h"
|
|
#include "llvm/MC/MCAsmInfo.h"
|
|
#include "llvm/MC/MCContext.h"
|
|
#include "llvm/MC/MCExpr.h"
|
|
#include "llvm/MC/MCInst.h"
|
|
#include "llvm/Support/ErrorHandling.h"
|
|
#include "llvm/Support/raw_ostream.h"
|
|
using namespace llvm;
|
|
|
|
MCSymbol *
|
|
BPFMCInstLower::GetGlobalAddressSymbol(const MachineOperand &MO) const {
|
|
return Printer.getSymbol(MO.getGlobal());
|
|
}
|
|
|
|
MCSymbol *
|
|
BPFMCInstLower::GetExternalSymbolSymbol(const MachineOperand &MO) const {
|
|
return Printer.GetExternalSymbolSymbol(MO.getSymbolName());
|
|
}
|
|
|
|
MCOperand BPFMCInstLower::LowerSymbolOperand(const MachineOperand &MO,
|
|
MCSymbol *Sym) const {
|
|
|
|
const MCExpr *Expr = MCSymbolRefExpr::create(Sym, Ctx);
|
|
|
|
if (!MO.isJTI() && MO.getOffset())
|
|
llvm_unreachable("unknown symbol op");
|
|
|
|
return MCOperand::createExpr(Expr);
|
|
}
|
|
|
|
void BPFMCInstLower::Lower(const MachineInstr *MI, MCInst &OutMI) const {
|
|
OutMI.setOpcode(MI->getOpcode());
|
|
|
|
for (unsigned i = 0, e = MI->getNumOperands(); i != e; ++i) {
|
|
const MachineOperand &MO = MI->getOperand(i);
|
|
|
|
MCOperand MCOp;
|
|
switch (MO.getType()) {
|
|
default:
|
|
MI->print(errs());
|
|
llvm_unreachable("unknown operand type");
|
|
case MachineOperand::MO_Register:
|
|
// Ignore all implicit register operands.
|
|
if (MO.isImplicit())
|
|
continue;
|
|
MCOp = MCOperand::createReg(MO.getReg());
|
|
break;
|
|
case MachineOperand::MO_Immediate:
|
|
MCOp = MCOperand::createImm(MO.getImm());
|
|
break;
|
|
case MachineOperand::MO_MachineBasicBlock:
|
|
MCOp = MCOperand::createExpr(
|
|
MCSymbolRefExpr::create(MO.getMBB()->getSymbol(), Ctx));
|
|
break;
|
|
case MachineOperand::MO_RegisterMask:
|
|
continue;
|
|
case MachineOperand::MO_ExternalSymbol:
|
|
MCOp = LowerSymbolOperand(MO, GetExternalSymbolSymbol(MO));
|
|
break;
|
|
case MachineOperand::MO_GlobalAddress:
|
|
MCOp = LowerSymbolOperand(MO, GetGlobalAddressSymbol(MO));
|
|
break;
|
|
}
|
|
|
|
OutMI.addOperand(MCOp);
|
|
}
|
|
}
|