lib/Target/RISCV/MCTargetDesc/RISCVInstPrinter.cpp

   1 //===-- RISCVInstPrinter.cpp - Convert RISCV 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 RISCV MCInst to a .s file.
  10 //
  11 //===----------------------------------------------------------------------===//
  12
  13 #include "RISCVInstPrinter.h"
  14 #include "MCTargetDesc/RISCVMCExpr.h"
  15 #include "Utils/RISCVBaseInfo.h"
  16 #include "llvm/MC/MCAsmInfo.h"
  17 #include "llvm/MC/MCExpr.h"
  18 #include "llvm/MC/MCInst.h"
  19 #include "llvm/MC/MCRegisterInfo.h"
  20 #include "llvm/MC/MCSubtargetInfo.h"
  21 #include "llvm/MC/MCSymbol.h"
  22 #include "llvm/Support/CommandLine.h"
  23 #include "llvm/Support/ErrorHandling.h"
  24 #include "llvm/Support/FormattedStream.h"
  25 using namespace llvm;
  26
  27 #define DEBUG_TYPE "asm-printer"
  28
  29 // Include the auto-generated portion of the assembly writer.
  30 #define PRINT_ALIAS_INSTR
  31 #include "RISCVGenAsmWriter.inc"
  32
  33 // Include the auto-generated portion of the compress emitter.
  34 #define GEN_UNCOMPRESS_INSTR
  35 #include "RISCVGenCompressInstEmitter.inc"
  36
  37 static cl::opt<bool>
  38     NoAliases("riscv-no-aliases",
  39               cl::desc("Disable the emission of assembler pseudo instructions"),
  40               cl::init(false), cl::Hidden);
  41
  42 void RISCVInstPrinter::printInst(const MCInst *MI, raw_ostream &O,
  43                                  StringRef Annot, const MCSubtargetInfo &STI) {
  44   bool Res = false;
  45   const MCInst *NewMI = MI;
  46   MCInst UncompressedMI;
  47   if (!NoAliases)
  48     Res = uncompressInst(UncompressedMI, *MI, MRI, STI);
  49   if (Res)
  50     NewMI = const_cast<MCInst *>(&UncompressedMI);
  51   if (NoAliases || !printAliasInstr(NewMI, STI, O))
  52     printInstruction(NewMI, STI, O);
  53   printAnnotation(O, Annot);
  54 }
  55
  56 void RISCVInstPrinter::printRegName(raw_ostream &O, unsigned RegNo) const {
  57   O << getRegisterName(RegNo);
  58 }
  59
  60 void RISCVInstPrinter::printOperand(const MCInst *MI, unsigned OpNo,
  61                                     const MCSubtargetInfo &STI, raw_ostream &O,
  62                                     const char *Modifier) {
  63   assert((Modifier == 0 || Modifier[0] == 0) && "No modifiers supported");
  64   const MCOperand &MO = MI->getOperand(OpNo);
  65
  66   if (MO.isReg()) {
  67     printRegName(O, MO.getReg());
  68     return;
  69   }
  70
  71   if (MO.isImm()) {
  72     O << MO.getImm();
  73     return;
  74   }
  75
  76   assert(MO.isExpr() && "Unknown operand kind in printOperand");
  77   MO.getExpr()->print(O, &MAI);
  78 }
  79
  80 void RISCVInstPrinter::printCSRSystemRegister(const MCInst *MI, unsigned OpNo,
  81                                               const MCSubtargetInfo &STI,
  82                                               raw_ostream &O) {
  83   unsigned Imm = MI->getOperand(OpNo).getImm();
  84   auto SysReg = RISCVSysReg::lookupSysRegByEncoding(Imm);
  85   if (SysReg && SysReg->haveRequiredFeatures(STI.getFeatureBits()))
  86     O << SysReg->Name;
  87   else
  88     O << Imm;
  89 }
  90
  91 void RISCVInstPrinter::printFenceArg(const MCInst *MI, unsigned OpNo,
  92                                      const MCSubtargetInfo &STI,
  93                                      raw_ostream &O) {
  94   unsigned FenceArg = MI->getOperand(OpNo).getImm();
  95   assert (((FenceArg >> 4) == 0) && "Invalid immediate in printFenceArg");
  96
  97   if ((FenceArg & RISCVFenceField::I) != 0)
  98     O << 'i';
  99   if ((FenceArg & RISCVFenceField::O) != 0)
 100     O << 'o';
 101   if ((FenceArg & RISCVFenceField::R) != 0)
 102     O << 'r';
 103   if ((FenceArg & RISCVFenceField::W) != 0)
 104     O << 'w';
 105   if (FenceArg == 0)
 106     O << "unknown";
 107 }
 108
 109 void RISCVInstPrinter::printFRMArg(const MCInst *MI, unsigned OpNo,
 110                                    const MCSubtargetInfo &STI, raw_ostream &O) {
 111   auto FRMArg =
 112       static_cast<RISCVFPRndMode::RoundingMode>(MI->getOperand(OpNo).getImm());
 113   O << RISCVFPRndMode::roundingModeToString(FRMArg);
 114 }