1//===- LoongArchInstPrinter.cpp - Convert LoongArch MCInst to asm syntax --===//
2//
3// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
4// See https://llvm.org/LICENSE.txt for license information.
5// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
6//
7//===----------------------------------------------------------------------===//
8//
9// This class prints an LoongArch MCInst to a .s file.
10//
11//===----------------------------------------------------------------------===//
12
13#include "LoongArchInstPrinter.h"
14#include "LoongArchBaseInfo.h"
15#include "LoongArchMCTargetDesc.h"
16#include "llvm/MC/MCAsmInfo.h"
17#include "llvm/MC/MCInst.h"
18#include "llvm/MC/MCRegisterInfo.h"
19#include "llvm/MC/MCSubtargetInfo.h"
20#include "llvm/MC/MCSymbol.h"
21#include "llvm/Support/CommandLine.h"
22using namespace llvm;
23
24#define DEBUG_TYPE "loongarch-asm-printer"
25
26// Include the auto-generated portion of the assembly writer.
27#define PRINT_ALIAS_INSTR
28#include "LoongArchGenAsmWriter.inc"
29
30static cl::opt<bool>
31    NumericReg("loongarch-numeric-reg",
32               cl::desc("Print numeric register names rather than the ABI "
33                        "names (such as $r0 instead of $zero)"),
34               cl::init(false), cl::Hidden);
35
36// The command-line flag above is used by llvm-mc and llc. It can be used by
37// `llvm-objdump`, but we override the value here to handle options passed to
38// `llvm-objdump` with `-M` (which matches GNU objdump). There did not seem to
39// be an easier way to allow these options in all these tools, without doing it
40// this way.
41bool LoongArchInstPrinter::applyTargetSpecificCLOption(StringRef Opt) {
42  if (Opt == "numeric") {
43    NumericReg = true;
44    return true;
45  }
46
47  return false;
48}
49
50void LoongArchInstPrinter::printInst(const MCInst *MI, uint64_t Address,
51                                     StringRef Annot,
52                                     const MCSubtargetInfo &STI,
53                                     raw_ostream &O) {
54  if (!printAliasInstr(MI, Address, STI, O))
55    printInstruction(MI, Address, STI, O);
56  printAnnotation(O, Annot);
57}
58
59void LoongArchInstPrinter::printRegName(raw_ostream &O, MCRegister Reg) const {
60  O << '$' << getRegisterName(Reg);
61}
62
63void LoongArchInstPrinter::printOperand(const MCInst *MI, unsigned OpNo,
64                                        const MCSubtargetInfo &STI,
65                                        raw_ostream &O) {
66  const MCOperand &MO = MI->getOperand(OpNo);
67
68  if (MO.isReg()) {
69    printRegName(O, MO.getReg());
70    return;
71  }
72
73  if (MO.isImm()) {
74    O << MO.getImm();
75    return;
76  }
77
78  assert(MO.isExpr() && "Unknown operand kind in printOperand");
79  MO.getExpr()->print(O, &MAI);
80}
81
82void LoongArchInstPrinter::printAtomicMemOp(const MCInst *MI, unsigned OpNo,
83                                            const MCSubtargetInfo &STI,
84                                            raw_ostream &O) {
85  const MCOperand &MO = MI->getOperand(OpNo);
86  assert(MO.isReg() && "printAtomicMemOp can only print register operands");
87  printRegName(O, MO.getReg());
88}
89
90const char *LoongArchInstPrinter::getRegisterName(MCRegister Reg) {
91  // Default print reg alias name
92  return getRegisterName(Reg, NumericReg ? LoongArch::NoRegAltName
93                                         : LoongArch::RegAliasName);
94}
95