1 //===-- RISCVInstPrinter.cpp - Convert RISCV MCInst to asm syntax ---------===//
2 //
3 //                     The LLVM Compiler Infrastructure
4 //
5 // This file is distributed under the University of Illinois Open Source
6 // License. See LICENSE.TXT for details.
7 //
8 //===----------------------------------------------------------------------===//
9 //
10 // This class prints an RISCV MCInst to a .s file.
11 //
12 //===----------------------------------------------------------------------===//
13 
14 #include "RISCVInstPrinter.h"
15 #include "MCTargetDesc/RISCVBaseInfo.h"
16 #include "MCTargetDesc/RISCVMCExpr.h"
17 #include "llvm/MC/MCAsmInfo.h"
18 #include "llvm/MC/MCExpr.h"
19 #include "llvm/MC/MCInst.h"
20 #include "llvm/MC/MCRegisterInfo.h"
21 #include "llvm/MC/MCSubtargetInfo.h"
22 #include "llvm/MC/MCSymbol.h"
23 #include "llvm/Support/CommandLine.h"
24 #include "llvm/Support/ErrorHandling.h"
25 #include "llvm/Support/FormattedStream.h"
26 using namespace llvm;
27 
28 #define DEBUG_TYPE "asm-printer"
29 
30 // Include the auto-generated portion of the assembly writer.
31 #define PRINT_ALIAS_INSTR
32 #include "RISCVGenAsmWriter.inc"
33 
34 // Include the auto-generated portion of the compress emitter.
35 #define GEN_UNCOMPRESS_INSTR
36 #include "RISCVGenCompressInstEmitter.inc"
37 
38 static cl::opt<bool>
39 NoAliases("riscv-no-aliases",
40             cl::desc("Disable the emission of assembler pseudo instructions"),
41             cl::init(false),
42             cl::Hidden);
43 
44 void RISCVInstPrinter::printInst(const MCInst *MI, raw_ostream &O,
45                                  StringRef Annot, const MCSubtargetInfo &STI) {
46   bool Res = false;
47   const MCInst *NewMI = MI;
48   MCInst UncompressedMI;
49   if (!NoAliases)
50     Res = uncompressInst(UncompressedMI, *MI, MRI, STI);
51   if (Res)
52     NewMI = const_cast<MCInst*>(&UncompressedMI);
53   if (NoAliases || !printAliasInstr(NewMI, STI, O))
54     printInstruction(NewMI, STI, O);
55   printAnnotation(O, Annot);
56 }
57 
58 void RISCVInstPrinter::printRegName(raw_ostream &O, unsigned RegNo) const {
59   O << getRegisterName(RegNo);
60 }
61 
62 void RISCVInstPrinter::printOperand(const MCInst *MI, unsigned OpNo,
63                                     const MCSubtargetInfo &STI,
64                                     raw_ostream &O, const char *Modifier) {
65   assert((Modifier == 0 || Modifier[0] == 0) && "No modifiers supported");
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 
82 void RISCVInstPrinter::printFenceArg(const MCInst *MI, unsigned OpNo,
83                                      const MCSubtargetInfo &STI,
84                                      raw_ostream &O) {
85   unsigned FenceArg = MI->getOperand(OpNo).getImm();
86   if ((FenceArg & RISCVFenceField::I) != 0)
87     O << 'i';
88   if ((FenceArg & RISCVFenceField::O) != 0)
89     O << 'o';
90   if ((FenceArg & RISCVFenceField::R) != 0)
91     O << 'r';
92   if ((FenceArg & RISCVFenceField::W) != 0)
93     O << 'w';
94 }
95 
96 void RISCVInstPrinter::printFRMArg(const MCInst *MI, unsigned OpNo,
97                                    const MCSubtargetInfo &STI,
98                                    raw_ostream &O) {
99   auto FRMArg =
100       static_cast<RISCVFPRndMode::RoundingMode>(MI->getOperand(OpNo).getImm());
101   O << RISCVFPRndMode::roundingModeToString(FRMArg);
102 }
103