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"
17 using namespace llvm;
18 
19 void 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 
28 MCInstPrinter::~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.
33 StringRef MCInstPrinter::getOpcodeName(unsigned Opcode) const {
34   return MII.getName(Opcode);
35 }
36 
37 void MCInstPrinter::printRegName(raw_ostream &OS, unsigned RegNo) const {
38   llvm_unreachable("Target should implement this");
39 }
40 
41 void 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.
55 StringRef MCInstPrinter::markup(StringRef s) const {
56   if (getUseMarkup())
57     return s;
58   else
59     return "";
60 }
61 StringRef 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.
69 static 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 
81 format_object<int64_t> MCInstPrinter::formatDec(int64_t Value) const {
82   return format("%" PRId64, Value);
83 }
84 
85 format_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 
108 format_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