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/ArrayRef.h"
12 #include "llvm/ADT/StringRef.h"
13 #include "llvm/MC/MCAsmInfo.h"
14 #include "llvm/MC/MCInstrInfo.h"
15 #include "llvm/Support/ErrorHandling.h"
16 #include "llvm/Support/Format.h"
17 #include "llvm/Support/raw_ostream.h"
18 #include <cinttypes>
19 #include <cstdint>
20
21 using namespace llvm;
22
dumpBytes(ArrayRef<uint8_t> bytes,raw_ostream & OS)23 void llvm::dumpBytes(ArrayRef<uint8_t> bytes, raw_ostream &OS) {
24 static const char hex_rep[] = "0123456789abcdef";
25 for (char i: bytes) {
26 OS << hex_rep[(i & 0xF0) >> 4];
27 OS << hex_rep[i & 0xF];
28 OS << ' ';
29 }
30 }
31
32 MCInstPrinter::~MCInstPrinter() = default;
33
34 /// getOpcodeName - Return the name of the specified opcode enum (e.g.
35 /// "MOV32ri") or empty if we can't resolve it.
getOpcodeName(unsigned Opcode) const36 StringRef MCInstPrinter::getOpcodeName(unsigned Opcode) const {
37 return MII.getName(Opcode);
38 }
39
printRegName(raw_ostream & OS,unsigned RegNo) const40 void MCInstPrinter::printRegName(raw_ostream &OS, unsigned RegNo) const {
41 llvm_unreachable("Target should implement this");
42 }
43
printAnnotation(raw_ostream & OS,StringRef Annot)44 void MCInstPrinter::printAnnotation(raw_ostream &OS, StringRef Annot) {
45 if (!Annot.empty()) {
46 if (CommentStream) {
47 (*CommentStream) << Annot;
48 // By definition (see MCInstPrinter.h), CommentStream must end with
49 // a newline after each comment.
50 if (Annot.back() != '\n')
51 (*CommentStream) << '\n';
52 } else
53 OS << " " << MAI.getCommentString() << " " << Annot;
54 }
55 }
56
57 /// Utility functions to make adding mark ups simpler.
markup(StringRef s) const58 StringRef MCInstPrinter::markup(StringRef s) const {
59 if (getUseMarkup())
60 return s;
61 else
62 return "";
63 }
markup(StringRef a,StringRef b) const64 StringRef MCInstPrinter::markup(StringRef a, StringRef b) const {
65 if (getUseMarkup())
66 return a;
67 else
68 return b;
69 }
70
71 // For asm-style hex (e.g. 0ffh) the first digit always has to be a number.
needsLeadingZero(uint64_t Value)72 static bool needsLeadingZero(uint64_t Value)
73 {
74 while (Value)
75 {
76 uint64_t digit = (Value >> 60) & 0xf;
77 if (digit != 0)
78 return (digit >= 0xa);
79 Value <<= 4;
80 }
81 return false;
82 }
83
formatDec(int64_t Value) const84 format_object<int64_t> MCInstPrinter::formatDec(int64_t Value) const {
85 return format("%" PRId64, Value);
86 }
87
formatHex(int64_t Value) const88 format_object<int64_t> MCInstPrinter::formatHex(int64_t Value) const {
89 switch(PrintHexStyle) {
90 case HexStyle::C:
91 if (Value < 0)
92 return format("-0x%" PRIx64, -Value);
93 else
94 return format("0x%" PRIx64, Value);
95 case HexStyle::Asm:
96 if (Value < 0) {
97 if (needsLeadingZero((uint64_t)(-Value)))
98 return format("-0%" PRIx64 "h", -Value);
99 else
100 return format("-%" PRIx64 "h", -Value);
101 } else {
102 if (needsLeadingZero((uint64_t)(Value)))
103 return format("0%" PRIx64 "h", Value);
104 else
105 return format("%" PRIx64 "h", Value);
106 }
107 }
108 llvm_unreachable("unsupported print style");
109 }
110
formatHex(uint64_t Value) const111 format_object<uint64_t> MCInstPrinter::formatHex(uint64_t Value) const {
112 switch(PrintHexStyle) {
113 case HexStyle::C:
114 return format("0x%" PRIx64, Value);
115 case HexStyle::Asm:
116 if (needsLeadingZero(Value))
117 return format("0%" PRIx64 "h", Value);
118 else
119 return format("%" PRIx64 "h", Value);
120 }
121 llvm_unreachable("unsupported print style");
122 }
123