1//===-- MCInstPrinter.cpp - Convert an MCInst to target 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#include "llvm/MC/MCInstPrinter.h"
11#include "llvm/ADT/StringRef.h"
12#include "llvm/MC/MCAsmInfo.h"
13#include "llvm/MC/MCInstrInfo.h"
14#include "llvm/Support/ErrorHandling.h"
15#include "llvm/Support/Format.h"
16#include "llvm/Support/raw_ostream.h"
17using namespace llvm;
18
19void llvm::dumpBytes(ArrayRef<uint8_t> bytes, raw_ostream &OS) {
20  static const char hex_rep[] = "0123456789abcdef";
21  for (char i: bytes) {
22    OS << hex_rep[(i & 0xF0) >> 4];
23    OS << hex_rep[i & 0xF];
24    OS << ' ';
25  }
26}
27
28MCInstPrinter::~MCInstPrinter() {
29}
30
31/// getOpcodeName - Return the name of the specified opcode enum (e.g.
32/// "MOV32ri") or empty if we can't resolve it.
33StringRef MCInstPrinter::getOpcodeName(unsigned Opcode) const {
34  return MII.getName(Opcode);
35}
36
37void MCInstPrinter::printRegName(raw_ostream &OS, unsigned RegNo) const {
38  llvm_unreachable("Target should implement this");
39}
40
41void MCInstPrinter::printAnnotation(raw_ostream &OS, StringRef Annot) {
42  if (!Annot.empty()) {
43    if (CommentStream) {
44      (*CommentStream) << Annot;
45      // By definition (see MCInstPrinter.h), CommentStream must end with
46      // a newline after each comment.
47      if (Annot.back() != '\n')
48        (*CommentStream) << '\n';
49    } else
50      OS << " " << MAI.getCommentString() << " " << Annot;
51  }
52}
53
54/// Utility functions to make adding mark ups simpler.
55StringRef MCInstPrinter::markup(StringRef s) const {
56  if (getUseMarkup())
57    return s;
58  else
59    return "";
60}
61StringRef MCInstPrinter::markup(StringRef a, StringRef b) const {
62  if (getUseMarkup())
63    return a;
64  else
65    return b;
66}
67
68// For asm-style hex (e.g. 0ffh) the first digit always has to be a number.
69static bool needsLeadingZero(uint64_t Value)
70{
71  while(Value)
72  {
73    uint64_t digit = (Value >> 60) & 0xf;
74    if (digit != 0)
75      return (digit >= 0xa);
76    Value <<= 4;
77  }
78  return false;
79}
80
81format_object<int64_t> MCInstPrinter::formatDec(int64_t Value) const {
82  return format("%" PRId64, Value);
83}
84
85format_object<int64_t> MCInstPrinter::formatHex(int64_t Value) const {
86  switch(PrintHexStyle) {
87  case HexStyle::C:
88    if (Value < 0)
89      return format("-0x%" PRIx64, -Value);
90    else
91      return format("0x%" PRIx64, Value);
92  case HexStyle::Asm:
93    if (Value < 0) {
94      if (needsLeadingZero((uint64_t)(-Value)))
95        return format("-0%" PRIx64 "h", -Value);
96      else
97        return format("-%" PRIx64 "h", -Value);
98    } else {
99      if (needsLeadingZero((uint64_t)(Value)))
100        return format("0%" PRIx64 "h", Value);
101      else
102        return format("%" PRIx64 "h", Value);
103    }
104  }
105  llvm_unreachable("unsupported print style");
106}
107
108format_object<uint64_t> MCInstPrinter::formatHex(uint64_t Value) const {
109  switch(PrintHexStyle) {
110  case HexStyle::C:
111     return format("0x%" PRIx64, Value);
112  case HexStyle::Asm:
113    if (needsLeadingZero(Value))
114      return format("0%" PRIx64 "h", Value);
115    else
116      return format("%" PRIx64 "h", Value);
117  }
118  llvm_unreachable("unsupported print style");
119}
120