LanaiMCInstLower.cpp
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//=-- LanaiMCInstLower.cpp - Convert Lanai 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 Lanai MachineInstrs to their corresponding
// MCInst records.
//
//===----------------------------------------------------------------------===//
#include "LanaiMCInstLower.h"
#include "MCTargetDesc/LanaiBaseInfo.h"
#include "MCTargetDesc/LanaiMCExpr.h"
#include "llvm/ADT/SmallString.h"
#include "llvm/CodeGen/AsmPrinter.h"
#include "llvm/CodeGen/MachineBasicBlock.h"
#include "llvm/CodeGen/MachineInstr.h"
#include "llvm/IR/Constants.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 *
LanaiMCInstLower::GetGlobalAddressSymbol(const MachineOperand &MO) const {
return Printer.getSymbol(MO.getGlobal());
}
MCSymbol *
LanaiMCInstLower::GetBlockAddressSymbol(const MachineOperand &MO) const {
return Printer.GetBlockAddressSymbol(MO.getBlockAddress());
}
MCSymbol *
LanaiMCInstLower::GetExternalSymbolSymbol(const MachineOperand &MO) const {
return Printer.GetExternalSymbolSymbol(MO.getSymbolName());
}
MCSymbol *LanaiMCInstLower::GetJumpTableSymbol(const MachineOperand &MO) const {
SmallString<256> Name;
raw_svector_ostream(Name) << Printer.MAI->getPrivateGlobalPrefix() << "JTI"
<< Printer.getFunctionNumber() << '_'
<< MO.getIndex();
// Create a symbol for the name.
return Ctx.getOrCreateSymbol(Name.str());
}
MCSymbol *
LanaiMCInstLower::GetConstantPoolIndexSymbol(const MachineOperand &MO) const {
SmallString<256> Name;
raw_svector_ostream(Name) << Printer.MAI->getPrivateGlobalPrefix() << "CPI"
<< Printer.getFunctionNumber() << '_'
<< MO.getIndex();
// Create a symbol for the name.
return Ctx.getOrCreateSymbol(Name.str());
}
MCOperand LanaiMCInstLower::LowerSymbolOperand(const MachineOperand &MO,
MCSymbol *Sym) const {
LanaiMCExpr::VariantKind Kind;
switch (MO.getTargetFlags()) {
case LanaiII::MO_NO_FLAG:
Kind = LanaiMCExpr::VK_Lanai_None;
break;
case LanaiII::MO_ABS_HI:
Kind = LanaiMCExpr::VK_Lanai_ABS_HI;
break;
case LanaiII::MO_ABS_LO:
Kind = LanaiMCExpr::VK_Lanai_ABS_LO;
break;
default:
llvm_unreachable("Unknown target flag on GV operand");
}
const MCExpr *Expr =
MCSymbolRefExpr::create(Sym, MCSymbolRefExpr::VK_None, Ctx);
if (!MO.isJTI() && MO.getOffset())
Expr = MCBinaryExpr::createAdd(
Expr, MCConstantExpr::create(MO.getOffset(), Ctx), Ctx);
Expr = LanaiMCExpr::create(Kind, Expr, Ctx);
return MCOperand::createExpr(Expr);
}
void LanaiMCInstLower::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()) {
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_GlobalAddress:
MCOp = LowerSymbolOperand(MO, GetGlobalAddressSymbol(MO));
break;
case MachineOperand::MO_BlockAddress:
MCOp = LowerSymbolOperand(MO, GetBlockAddressSymbol(MO));
break;
case MachineOperand::MO_ExternalSymbol:
MCOp = LowerSymbolOperand(MO, GetExternalSymbolSymbol(MO));
break;
case MachineOperand::MO_JumpTableIndex:
MCOp = LowerSymbolOperand(MO, GetJumpTableSymbol(MO));
break;
case MachineOperand::MO_ConstantPoolIndex:
MCOp = LowerSymbolOperand(MO, GetConstantPoolIndexSymbol(MO));
break;
default:
MI->print(errs());
llvm_unreachable("unknown operand type");
}
OutMI.addOperand(MCOp);
}
}