llvm/lib/Target/CSKY/MCTargetDesc/CSKYInstPrinter.cpp

   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.
  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
  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
  71 void CSKYInstPrinter::printRegName(raw_ostream &O, unsigned RegNo) const {
  72   O << getRegisterName(RegNo);
  73 }
  74
  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
  98 const char *CSKYInstPrinter::getRegisterName(unsigned RegNo) {
  99   return getRegisterName(RegNo, ArchRegNames ? CSKY::NoRegAltName
 100                                              : CSKY::ABIRegAltName);
 101 }