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//===-- M68kMCInstLower.cpp - M68k MachineInstr to MCInst -------*- 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
//
//===----------------------------------------------------------------------===//
///
/// \file
/// This file contains code to lower M68k MachineInstrs to their
/// corresponding MCInst records.
///
//===----------------------------------------------------------------------===//
#include "M68kMCInstLower.h"
#include "M68kAsmPrinter.h"
#include "M68kInstrInfo.h"
#include "MCTargetDesc/M68kBaseInfo.h"
#include "llvm/CodeGen/MachineFunction.h"
#include "llvm/CodeGen/MachineInstr.h"
#include "llvm/CodeGen/MachineOperand.h"
#include "llvm/IR/Mangler.h"
#include "llvm/MC/MCContext.h"
#include "llvm/MC/MCExpr.h"
#include "llvm/MC/MCInst.h"
using namespace llvm;
#define DEBUG_TYPE "m68k-mc-inst-lower"
M68kMCInstLower::M68kMCInstLower(MachineFunction &MF, M68kAsmPrinter &AP)
: Ctx(MF.getContext()), MF(MF), TM(MF.getTarget()), MAI(*TM.getMCAsmInfo()),
AsmPrinter(AP) {}
MCSymbol *
M68kMCInstLower::GetSymbolFromOperand(const MachineOperand &MO) const {
assert((MO.isGlobal() || MO.isSymbol() || MO.isMBB()) &&
"Isn't a symbol reference");
const auto &TT = TM.getTargetTriple();
if (MO.isGlobal() && TT.isOSBinFormatELF())
return AsmPrinter.getSymbolPreferLocal(*MO.getGlobal());
const DataLayout &DL = MF.getDataLayout();
MCSymbol *Sym = nullptr;
SmallString<128> Name;
StringRef Suffix;
if (!Suffix.empty())
Name += DL.getPrivateGlobalPrefix();
if (MO.isGlobal()) {
const GlobalValue *GV = MO.getGlobal();
AsmPrinter.getNameWithPrefix(Name, GV);
} else if (MO.isSymbol()) {
Mangler::getNameWithPrefix(Name, MO.getSymbolName(), DL);
} else if (MO.isMBB()) {
assert(Suffix.empty());
Sym = MO.getMBB()->getSymbol();
}
Name += Suffix;
if (!Sym)
Sym = Ctx.getOrCreateSymbol(Name);
return Sym;
}
MCOperand M68kMCInstLower::LowerSymbolOperand(const MachineOperand &MO,
MCSymbol *Sym) const {
// FIXME We would like an efficient form for this, so we don't have to do a
// lot of extra uniquing. This fixme is originally from X86
const MCExpr *Expr = nullptr;
MCSymbolRefExpr::VariantKind RefKind = MCSymbolRefExpr::VK_None;
switch (MO.getTargetFlags()) {
default:
llvm_unreachable("Unknown target flag on GV operand");
case M68kII::MO_NO_FLAG:
case M68kII::MO_ABSOLUTE_ADDRESS:
case M68kII::MO_PC_RELATIVE_ADDRESS:
break;
case M68kII::MO_GOTPCREL:
RefKind = MCSymbolRefExpr::VK_GOTPCREL;
break;
case M68kII::MO_GOT:
RefKind = MCSymbolRefExpr::VK_GOT;
break;
case M68kII::MO_GOTOFF:
RefKind = MCSymbolRefExpr::VK_GOTOFF;
break;
case M68kII::MO_PLT:
RefKind = MCSymbolRefExpr::VK_PLT;
break;
case M68kII::MO_TLSGD:
RefKind = MCSymbolRefExpr::VK_TLSGD;
break;
case M68kII::MO_TLSLD:
RefKind = MCSymbolRefExpr::VK_TLSLD;
break;
case M68kII::MO_TLSLDM:
RefKind = MCSymbolRefExpr::VK_TLSLDM;
break;
case M68kII::MO_TLSIE:
RefKind = MCSymbolRefExpr::VK_GOTTPOFF;
break;
case M68kII::MO_TLSLE:
RefKind = MCSymbolRefExpr::VK_TPOFF;
break;
}
if (!Expr) {
Expr = MCSymbolRefExpr::create(Sym, RefKind, Ctx);
}
if (!MO.isJTI() && !MO.isMBB() && MO.getOffset()) {
Expr = MCBinaryExpr::createAdd(
Expr, MCConstantExpr::create(MO.getOffset(), Ctx), Ctx);
}
return MCOperand::createExpr(Expr);
}
std::optional<MCOperand>
M68kMCInstLower::LowerOperand(const MachineInstr *MI,
const MachineOperand &MO) const {
switch (MO.getType()) {
default:
llvm_unreachable("unknown operand type");
case MachineOperand::MO_Register:
// Ignore all implicit register operands.
if (MO.isImplicit())
return std::nullopt;
return MCOperand::createReg(MO.getReg());
case MachineOperand::MO_Immediate:
return MCOperand::createImm(MO.getImm());
case MachineOperand::MO_MachineBasicBlock:
case MachineOperand::MO_GlobalAddress:
case MachineOperand::MO_ExternalSymbol:
return LowerSymbolOperand(MO, GetSymbolFromOperand(MO));
case MachineOperand::MO_MCSymbol:
return LowerSymbolOperand(MO, MO.getMCSymbol());
case MachineOperand::MO_JumpTableIndex:
return LowerSymbolOperand(MO, AsmPrinter.GetJTISymbol(MO.getIndex()));
case MachineOperand::MO_ConstantPoolIndex:
return LowerSymbolOperand(MO, AsmPrinter.GetCPISymbol(MO.getIndex()));
case MachineOperand::MO_BlockAddress:
return LowerSymbolOperand(
MO, AsmPrinter.GetBlockAddressSymbol(MO.getBlockAddress()));
case MachineOperand::MO_RegisterMask:
// Ignore call clobbers.
return std::nullopt;
}
}
void M68kMCInstLower::Lower(const MachineInstr *MI, MCInst &OutMI) const {
unsigned Opcode = MI->getOpcode();
OutMI.setOpcode(Opcode);
for (unsigned i = 0, e = MI->getNumOperands(); i != e; ++i) {
const MachineOperand &MO = MI->getOperand(i);
std::optional<MCOperand> MCOp = LowerOperand(MI, MO);
if (MCOp.has_value() && MCOp.value().isValid())
OutMI.addOperand(MCOp.value());
}
// TAILJMPj, TAILJMPq - Lower to the correct jump instructions.
if (Opcode == M68k::TAILJMPj || Opcode == M68k::TAILJMPq) {
assert(OutMI.getNumOperands() == 1 && "Unexpected number of operands");
switch (Opcode) {
case M68k::TAILJMPj:
Opcode = M68k::JMP32j;
break;
case M68k::TAILJMPq:
Opcode = M68k::BRA8;
break;
}
OutMI.setOpcode(Opcode);
}
}
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