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"
22 using 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
30 static 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 $zero)"),
34 cl::init(false), cl::Hidden);
35
36 // The command-line flag above is used by llvm-mc and llc. It can be used by
37 // `llvm-objdump`, but we override the value here to handle options passed to
38 // `llvm-objdump` with `-M` (which matches GNU objdump). There did not seem to
39 // be an easier way to allow these options in all these tools, without doing it
40 // this way.
applyTargetSpecificCLOption(StringRef Opt)41 bool LoongArchInstPrinter::applyTargetSpecificCLOption(StringRef Opt) {
42 if (Opt == "numeric") {
43 NumericReg = true;
44 return true;
45 }
46
47 return false;
48 }
49
printInst(const MCInst * MI,uint64_t Address,StringRef Annot,const MCSubtargetInfo & STI,raw_ostream & O)50 void LoongArchInstPrinter::printInst(const MCInst *MI, uint64_t Address,
51 StringRef Annot,
52 const MCSubtargetInfo &STI,
53 raw_ostream &O) {
54 if (!printAliasInstr(MI, Address, STI, O))
55 printInstruction(MI, Address, STI, O);
56 printAnnotation(O, Annot);
57 }
58
printRegName(raw_ostream & O,MCRegister Reg) const59 void LoongArchInstPrinter::printRegName(raw_ostream &O, MCRegister Reg) const {
60 O << '$' << getRegisterName(Reg);
61 }
62
printOperand(const MCInst * MI,unsigned OpNo,const MCSubtargetInfo & STI,raw_ostream & O)63 void 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
printAtomicMemOp(const MCInst * MI,unsigned OpNo,const MCSubtargetInfo & STI,raw_ostream & O)82 void 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
getRegisterName(MCRegister Reg)90 const char *LoongArchInstPrinter::getRegisterName(MCRegister Reg) {
91 // Default print reg alias name
92 return getRegisterName(Reg, NumericReg ? LoongArch::NoRegAltName
93 : LoongArch::RegAliasName);
94 }
95