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 $zero)"),
34 cl::init(Val: false), cl::Hidden);
35
36// The command-line flag above is used by llvm-mc and llc. It can be used by
37// `llvm-objdump`, but we override the value here to handle options passed to
38// `llvm-objdump` with `-M` (which matches GNU objdump). There did not seem to
39// be an easier way to allow these options in all these tools, without doing it
40// this way.
41bool LoongArchInstPrinter::applyTargetSpecificCLOption(StringRef Opt) {
42 if (Opt == "numeric") {
43 NumericReg = true;
44 return true;
45 }
46
47 return false;
48}
49
50void LoongArchInstPrinter::printInst(const MCInst *MI, uint64_t Address,
51 StringRef Annot,
52 const MCSubtargetInfo &STI,
53 raw_ostream &O) {
54 if (!printAliasInstr(MI, Address, STI, OS&: O))
55 printInstruction(MI, Address, STI, O);
56 printAnnotation(OS&: O, Annot);
57}
58
59void LoongArchInstPrinter::printRegName(raw_ostream &O, MCRegister Reg) const {
60 O << '$' << 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(i: OpNo);
67
68 if (MO.isReg()) {
69 printRegName(O, Reg: 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(OS&: O, MAI: &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(i: OpNo);
86 assert(MO.isReg() && "printAtomicMemOp can only print register operands");
87 printRegName(O, Reg: MO.getReg());
88}
89
90const char *LoongArchInstPrinter::getRegisterName(MCRegister Reg) {
91 // Default print reg alias name
92 return getRegisterName(Reg, AltIdx: NumericReg ? LoongArch::NoRegAltName
93 : LoongArch::RegAliasName);
94}
95