1 //===-- CSKYInstPrinter.cpp - Convert CSKY 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 CSKY MCInst to a .s file.
10 //
11 //===----------------------------------------------------------------------===//
12
13 #include "CSKYInstPrinter.h"
14 #include "llvm/MC/MCAsmInfo.h"
15 #include "llvm/MC/MCExpr.h"
16 #include "llvm/MC/MCInst.h"
17 #include "llvm/MC/MCRegisterInfo.h"
18 #include "llvm/MC/MCSubtargetInfo.h"
19 #include "llvm/MC/MCSymbol.h"
20 #include "llvm/Support/CommandLine.h"
21 #include "llvm/Support/ErrorHandling.h"
22 #include "llvm/Support/FormattedStream.h"
23
24 using namespace llvm;
25
26 #define DEBUG_TYPE "csky-asm-printer"
27
28 // Include the auto-generated portion of the assembly writer.
29 #define PRINT_ALIAS_INSTR
30 #include "CSKYGenAsmWriter.inc"
31
32 static cl::opt<bool>
33 NoAliases("csky-no-aliases",
34 cl::desc("Disable the emission of assembler pseudo instructions"),
35 cl::init(false), cl::Hidden);
36
37 static cl::opt<bool>
38 ArchRegNames("csky-arch-reg-names",
39 cl::desc("Print architectural register names rather than the "
40 "ABI names (such as r14 instead of sp)"),
41 cl::init(false), cl::Hidden);
42
43 // The command-line flags above are used by llvm-mc and llc. They can be used by
44 // `llvm-objdump`, but we override their values here to handle options passed to
45 // `llvm-objdump` with `-M` (which matches GNU objdump). There did not seem to
46 // be an easier way to allow these options in all these tools, without doing it
47 // this way.
applyTargetSpecificCLOption(StringRef Opt)48 bool CSKYInstPrinter::applyTargetSpecificCLOption(StringRef Opt) {
49 if (Opt == "no-aliases") {
50 NoAliases = true;
51 return true;
52 }
53 if (Opt == "numeric") {
54 ArchRegNames = true;
55 return true;
56 }
57
58 return false;
59 }
60
printInst(const MCInst * MI,uint64_t Address,StringRef Annot,const MCSubtargetInfo & STI,raw_ostream & O)61 void CSKYInstPrinter::printInst(const MCInst *MI, uint64_t Address,
62 StringRef Annot, const MCSubtargetInfo &STI,
63 raw_ostream &O) {
64 const MCInst *NewMI = MI;
65
66 if (NoAliases || !printAliasInstr(NewMI, Address, STI, O))
67 printInstruction(NewMI, Address, STI, O);
68 printAnnotation(O, Annot);
69 }
70
printRegName(raw_ostream & O,unsigned RegNo) const71 void CSKYInstPrinter::printRegName(raw_ostream &O, unsigned RegNo) const {
72 O << getRegisterName(RegNo);
73 }
74
printOperand(const MCInst * MI,unsigned OpNo,const MCSubtargetInfo & STI,raw_ostream & O,const char * Modifier)75 void CSKYInstPrinter::printOperand(const MCInst *MI, unsigned OpNo,
76 const MCSubtargetInfo &STI, raw_ostream &O,
77 const char *Modifier) {
78 assert((Modifier == 0 || Modifier[0] == 0) && "No modifiers supported");
79 const MCOperand &MO = MI->getOperand(OpNo);
80
81 if (MO.isReg()) {
82 if (MO.getReg() == CSKY::C)
83 O << "";
84 else
85 printRegName(O, MO.getReg());
86 return;
87 }
88
89 if (MO.isImm()) {
90 O << formatImm(MO.getImm());
91 return;
92 }
93
94 assert(MO.isExpr() && "Unknown operand kind in printOperand");
95 MO.getExpr()->print(O, &MAI);
96 }
97
getRegisterName(unsigned RegNo)98 const char *CSKYInstPrinter::getRegisterName(unsigned RegNo) {
99 return getRegisterName(RegNo, ArchRegNames ? CSKY::NoRegAltName
100 : CSKY::ABIRegAltName);
101 }
102