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//===-- M68kAsmPrinter.cpp - M68k LLVM Assembly Printer ---------*- 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 a printer that converts from our internal representation
/// of machine-dependent LLVM code to GAS-format M68k assembly language.
///
//===----------------------------------------------------------------------===//
// TODO Conform to Motorola ASM syntax
#include "M68kAsmPrinter.h"
#include "M68k.h"
#include "M68kMachineFunction.h"
#include "MCTargetDesc/M68kInstPrinter.h"
#include "TargetInfo/M68kTargetInfo.h"
#include "llvm/MC/TargetRegistry.h"
using namespace llvm;
#define DEBUG_TYPE "m68k-asm-printer"
bool M68kAsmPrinter::runOnMachineFunction(MachineFunction &MF) {
MMFI = MF.getInfo<M68kMachineFunctionInfo>();
MCInstLowering = std::make_unique<M68kMCInstLower>(MF, *this);
AsmPrinter::runOnMachineFunction(MF);
return true;
}
void M68kAsmPrinter::printOperand(const MachineInstr *MI, int OpNum,
raw_ostream &OS) {
const MachineOperand &MO = MI->getOperand(OpNum);
switch (MO.getType()) {
case MachineOperand::MO_Register:
OS << "%" << M68kInstPrinter::getRegisterName(MO.getReg());
break;
case MachineOperand::MO_Immediate:
OS << '#' << MO.getImm();
break;
case MachineOperand::MO_MachineBasicBlock:
MO.getMBB()->getSymbol()->print(OS, MAI);
break;
case MachineOperand::MO_GlobalAddress:
PrintSymbolOperand(MO, OS);
break;
case MachineOperand::MO_BlockAddress:
GetBlockAddressSymbol(MO.getBlockAddress())->print(OS, MAI);
break;
case MachineOperand::MO_ConstantPoolIndex: {
const DataLayout &DL = getDataLayout();
OS << DL.getPrivateGlobalPrefix() << "CPI" << getFunctionNumber() << '_'
<< MO.getIndex();
break;
}
default:
llvm_unreachable("not implemented");
}
}
bool M68kAsmPrinter::PrintAsmOperand(const MachineInstr *MI, unsigned OpNo,
const char *ExtraCode, raw_ostream &OS) {
// Print the operand if there is no operand modifier.
if (!ExtraCode || !ExtraCode[0]) {
printOperand(MI, OpNo, OS);
return false;
}
// Fallback to the default implementation.
return AsmPrinter::PrintAsmOperand(MI, OpNo, ExtraCode, OS);
}
void M68kAsmPrinter::printDisp(const MachineInstr *MI, unsigned opNum,
raw_ostream &O) {
// Print immediate displacement without the '#' predix
const MachineOperand &Op = MI->getOperand(opNum);
if (Op.isImm()) {
O << Op.getImm();
return;
}
// Displacement is relocatable, so we're pretty permissive about what
// can be put here.
printOperand(MI, opNum, O);
}
void M68kAsmPrinter::printAbsMem(const MachineInstr *MI, unsigned OpNum,
raw_ostream &O) {
const MachineOperand &MO = MI->getOperand(OpNum);
if (MO.isImm())
O << format("$%0" PRIx64, (uint64_t)MO.getImm());
else
PrintAsmMemoryOperand(MI, OpNum, nullptr, O);
}
bool M68kAsmPrinter::PrintAsmMemoryOperand(const MachineInstr *MI,
unsigned OpNo, const char *ExtraCode,
raw_ostream &OS) {
const MachineOperand &MO = MI->getOperand(OpNo);
switch (MO.getType()) {
case MachineOperand::MO_Immediate:
// Immediate value that goes here is the addressing mode kind we set
// in M68kDAGToDAGISel::SelectInlineAsmMemoryOperand.
using namespace M68k;
// Skip the addressing mode kind operand.
++OpNo;
// Decode MemAddrModeKind.
switch (static_cast<MemAddrModeKind>(MO.getImm())) {
case MemAddrModeKind::j:
printARIMem(MI, OpNo, OS);
break;
case MemAddrModeKind::o:
printARIPIMem(MI, OpNo, OS);
break;
case MemAddrModeKind::e:
printARIPDMem(MI, OpNo, OS);
break;
case MemAddrModeKind::p:
printARIDMem(MI, OpNo, OS);
break;
case MemAddrModeKind::f:
case MemAddrModeKind::F:
printARIIMem(MI, OpNo, OS);
break;
case MemAddrModeKind::k:
printPCIMem(MI, 0, OpNo, OS);
break;
case MemAddrModeKind::q:
printPCDMem(MI, 0, OpNo, OS);
break;
case MemAddrModeKind::b:
printAbsMem(MI, OpNo, OS);
break;
default:
llvm_unreachable("Unrecognized memory addressing mode");
}
return false;
case MachineOperand::MO_GlobalAddress:
PrintSymbolOperand(MO, OS);
return false;
case MachineOperand::MO_BlockAddress:
GetBlockAddressSymbol(MO.getBlockAddress())->print(OS, MAI);
return false;
case MachineOperand::MO_Register:
// This is a special case where it is treated as a memory reference, with
// the register holding the address value. Thus, we print it as ARI here.
if (M68kII::isAddressRegister(MO.getReg())) {
printARIMem(MI, OpNo, OS);
return false;
}
break;
default:
break;
}
return AsmPrinter::PrintAsmMemoryOperand(MI, OpNo, ExtraCode, OS);
}
void M68kAsmPrinter::emitInstruction(const MachineInstr *MI) {
M68k_MC::verifyInstructionPredicates(MI->getOpcode(),
getSubtargetInfo().getFeatureBits());
switch (MI->getOpcode()) {
default: {
if (MI->isPseudo()) {
LLVM_DEBUG(dbgs() << "Pseudo opcode(" << MI->getOpcode()
<< ") found in EmitInstruction()\n");
llvm_unreachable("Cannot proceed");
}
break;
}
case M68k::TAILJMPj:
case M68k::TAILJMPq:
// Lower these as normal, but add some comments.
OutStreamer->AddComment("TAILCALL");
break;
}
MCInst TmpInst0;
MCInstLowering->Lower(MI, TmpInst0);
OutStreamer->emitInstruction(TmpInst0, getSubtargetInfo());
}
void M68kAsmPrinter::emitFunctionBodyStart() {}
void M68kAsmPrinter::emitFunctionBodyEnd() {}
void M68kAsmPrinter::emitStartOfAsmFile(Module &M) {
OutStreamer->emitSyntaxDirective();
}
void M68kAsmPrinter::emitEndOfAsmFile(Module &M) {}
extern "C" LLVM_EXTERNAL_VISIBILITY void LLVMInitializeM68kAsmPrinter() {
RegisterAsmPrinter<M68kAsmPrinter> X(getTheM68kTarget());
}
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