1 //===- HexagonInstPrinter.cpp - Convert Hexagon MCInst to assembly 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 Hexagon MCInst to a .s file.
11 //
12 //===----------------------------------------------------------------------===//
13 
14 #include "HexagonInstPrinter.h"
15 #include "HexagonAsmPrinter.h"
16 #include "MCTargetDesc/HexagonBaseInfo.h"
17 #include "MCTargetDesc/HexagonMCInstrInfo.h"
18 #include "llvm/MC/MCAsmInfo.h"
19 #include "llvm/MC/MCExpr.h"
20 #include "llvm/MC/MCInst.h"
21 #include "llvm/Support/Debug.h"
22 #include "llvm/Support/raw_ostream.h"
23 
24 using namespace llvm;
25 
26 #define DEBUG_TYPE "asm-printer"
27 
28 #define GET_INSTRUCTION_NAME
29 #include "HexagonGenAsmWriter.inc"
30 
31 void HexagonInstPrinter::printRegName(raw_ostream &O, unsigned RegNo) const {
32   O << getRegisterName(RegNo);
33 }
34 
35 void HexagonInstPrinter::printInst(const MCInst *MI, raw_ostream &OS,
36                                    StringRef Annot, const MCSubtargetInfo &STI) {
37   assert(HexagonMCInstrInfo::isBundle(*MI));
38   assert(HexagonMCInstrInfo::bundleSize(*MI) <= HEXAGON_PACKET_SIZE);
39   assert(HexagonMCInstrInfo::bundleSize(*MI) > 0);
40   HasExtender = false;
41   for (auto const &I : HexagonMCInstrInfo::bundleInstructions(*MI)) {
42     MCInst const &MCI = *I.getInst();
43     if (HexagonMCInstrInfo::isDuplex(MII, MCI)) {
44       printInstruction(MCI.getOperand(1).getInst(), OS);
45       OS << '\v';
46       HasExtender = false;
47       printInstruction(MCI.getOperand(0).getInst(), OS);
48     } else
49       printInstruction(&MCI, OS);
50     HasExtender = HexagonMCInstrInfo::isImmext(MCI);
51     OS << "\n";
52   }
53 
54   bool IsLoop0 = HexagonMCInstrInfo::isInnerLoop(*MI);
55   bool IsLoop1 = HexagonMCInstrInfo::isOuterLoop(*MI);
56   if (IsLoop0) {
57     OS << (IsLoop1 ? " :endloop01" : " :endloop0");
58   } else if (IsLoop1) {
59     OS << " :endloop1";
60   }
61 }
62 
63 void HexagonInstPrinter::printOperand(MCInst const *MI, unsigned OpNo,
64                                       raw_ostream &O) const {
65   if (HexagonMCInstrInfo::getExtendableOp(MII, *MI) == OpNo &&
66       (HasExtender || HexagonMCInstrInfo::isConstExtended(MII, *MI)))
67     O << "#";
68   MCOperand const &MO = MI->getOperand(OpNo);
69   if (MO.isReg()) {
70     O << getRegisterName(MO.getReg());
71   } else if (MO.isExpr()) {
72     int64_t Value;
73     if (MO.getExpr()->evaluateAsAbsolute(Value))
74       O << formatImm(Value);
75     else
76       O << *MO.getExpr();
77   } else {
78     llvm_unreachable("Unknown operand");
79   }
80 }
81 
82 void HexagonInstPrinter::printBrtarget(MCInst const *MI, unsigned OpNo,
83                                        raw_ostream &O) const {
84   MCOperand const &MO = MI->getOperand(OpNo);
85   assert (MO.isExpr());
86   MCExpr const &Expr = *MO.getExpr();
87   int64_t Value;
88   if (Expr.evaluateAsAbsolute(Value))
89     O << format("0x%" PRIx64, Value);
90   else {
91     if (HasExtender || HexagonMCInstrInfo::isConstExtended(MII, *MI))
92       if (HexagonMCInstrInfo::getExtendableOp(MII, *MI) == OpNo)
93         O << "##";
94     O << Expr;
95   }
96 }
97