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 
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.
36 StringRef MCInstPrinter::getOpcodeName(unsigned Opcode) const {
37   return MII.getName(Opcode);
38 }
39 
40 void MCInstPrinter::printRegName(raw_ostream &OS, unsigned RegNo) const {
41   llvm_unreachable("Target should implement this");
42 }
43 
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.
58 StringRef MCInstPrinter::markup(StringRef s) const {
59   if (getUseMarkup())
60     return s;
61   else
62     return "";
63 }
64 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.
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 
84 format_object<int64_t> MCInstPrinter::formatDec(int64_t Value) const {
85   return format("%" PRId64, Value);
86 }
87 
88 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 
111 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