MCInstPrinter.cpp revision 1cd2ed8fdf7547bff3aaedccaac741b8a1d416a3 
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
19MCInstPrinter::~MCInstPrinter() {
20}
21
22/// getOpcodeName - Return the name of the specified opcode enum (e.g.
23/// "MOV32ri") or empty if we can't resolve it.
24StringRef MCInstPrinter::getOpcodeName(unsigned Opcode) const {
25  return MII.getName(Opcode);
26}
27
28void MCInstPrinter::printRegName(raw_ostream &OS, unsigned RegNo) const {
29  llvm_unreachable("Target should implement this");
30}
31
32void MCInstPrinter::printAnnotation(raw_ostream &OS, StringRef Annot) {
33  if (!Annot.empty()) {
34    if (CommentStream)
35      (*CommentStream) << Annot;
36    else
37      OS << " " << MAI.getCommentString() << " " << Annot;
38  }
39}
40
41/// Utility functions to make adding mark ups simpler.
42StringRef MCInstPrinter::markup(StringRef s) const {
43  if (getUseMarkup())
44    return s;
45  else
46    return "";
47}
48StringRef MCInstPrinter::markup(StringRef a, StringRef b) const {
49  if (getUseMarkup())
50    return a;
51  else
52    return b;
53}
54
55// For asm-style hex (e.g. 0ffh) the first digit always has to be a number.
56static bool needsLeadingZero(uint64_t Value)
57{
58  while(Value)
59  {
60    uint64_t digit = (Value >> 60) & 0xf;
61    if (digit != 0)
62      return (digit >= 0xa);
63    Value <<= 4;
64  }
65  return false;
66}
67
68format_object1<int64_t> MCInstPrinter::formatDec(const int64_t Value) const {
69  return format("%" PRId64, Value);
70}
71
72format_object1<int64_t> MCInstPrinter::formatHex(const int64_t Value) const {
73  switch(PrintHexStyle) {
74  case HexStyle::C:
75    if (Value < 0)
76      return format("-0x%" PRIx64, -Value);
77    else
78      return format("0x%" PRIx64, Value);
79  case HexStyle::Asm:
80    if (Value < 0) {
81      if (needsLeadingZero((uint64_t)(-Value)))
82        return format("-0%" PRIx64 "h", -Value);
83      else
84        return format("-%" PRIx64 "h", -Value);
85    } else {
86      if (needsLeadingZero((uint64_t)(Value)))
87        return format("0%" PRIx64 "h", Value);
88      else
89        return format("%" PRIx64 "h", Value);
90    }
91  }
92  llvm_unreachable("unsupported print style");
93}
94
95format_object1<uint64_t> MCInstPrinter::formatHex(const uint64_t Value) const {
96  switch(PrintHexStyle) {
97  case HexStyle::C:
98     return format("0x%" PRIx64, Value);
99  case HexStyle::Asm:
100    if (needsLeadingZero(Value))
101      return format("0%" PRIx64 "h", Value);
102    else
103      return format("%" PRIx64 "h", Value);
104  }
105  llvm_unreachable("unsupported print style");
106}
107