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annotate tools/llvm-mc/Disassembler.cpp @ 77:54457678186b LLVM3.6

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LLVM 3.6
author Kaito Tokumori <e105711@ie.u-ryukyu.ac.jp>
date Mon, 08 Sep 2014 22:06:00 +0900
parents 95c75e76d11b
children 60c9769439b8
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1 //===- Disassembler.cpp - Disassembler for hex strings --------------------===//
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2 //
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3 // The LLVM Compiler Infrastructure
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4 //
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5 // This file is distributed under the University of Illinois Open Source
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6 // License. See LICENSE.TXT for details.
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7 //
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8 //===----------------------------------------------------------------------===//
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9 //
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10 // This class implements the disassembler of strings of bytes written in
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11 // hexadecimal, from standard input or from a file.
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12 //
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13 //===----------------------------------------------------------------------===//
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14
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15 #include "Disassembler.h"
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16 #include "llvm/ADT/Triple.h"
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17 #include "llvm/MC/MCAsmInfo.h"
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18 #include "llvm/MC/MCContext.h"
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19 #include "llvm/MC/MCDisassembler.h"
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20 #include "llvm/MC/MCInst.h"
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21 #include "llvm/MC/MCRegisterInfo.h"
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22 #include "llvm/MC/MCStreamer.h"
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23 #include "llvm/MC/MCSubtargetInfo.h"
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24 #include "llvm/Support/MemoryBuffer.h"
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25 #include "llvm/Support/MemoryObject.h"
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26 #include "llvm/Support/SourceMgr.h"
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27 #include "llvm/Support/TargetRegistry.h"
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28 #include "llvm/Support/raw_ostream.h"
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29
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30 using namespace llvm;
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31
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32 typedef std::vector<std::pair<unsigned char, const char*> > ByteArrayTy;
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33
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34 namespace {
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35 class VectorMemoryObject : public MemoryObject {
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36 private:
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37 const ByteArrayTy &Bytes;
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38 public:
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39 VectorMemoryObject(const ByteArrayTy &bytes) : Bytes(bytes) {}
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40
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41 uint64_t getBase() const override { return 0; }
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42 uint64_t getExtent() const override { return Bytes.size(); }
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43
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44 int readByte(uint64_t Addr, uint8_t *Byte) const override {
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45 if (Addr >= getExtent())
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46 return -1;
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47 *Byte = Bytes[Addr].first;
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48 return 0;
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49 }
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50 };
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51 }
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52
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53 static bool PrintInsts(const MCDisassembler &DisAsm,
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54 const ByteArrayTy &Bytes,
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55 SourceMgr &SM, raw_ostream &Out,
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56 MCStreamer &Streamer, bool InAtomicBlock,
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57 const MCSubtargetInfo &STI) {
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58 // Wrap the vector in a MemoryObject.
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59 VectorMemoryObject memoryObject(Bytes);
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60
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61 // Disassemble it to strings.
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62 uint64_t Size;
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63 uint64_t Index;
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64
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65 for (Index = 0; Index < Bytes.size(); Index += Size) {
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66 MCInst Inst;
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67
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68 MCDisassembler::DecodeStatus S;
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69 S = DisAsm.getInstruction(Inst, Size, memoryObject, Index,
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70 /*REMOVE*/ nulls(), nulls());
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71 switch (S) {
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72 case MCDisassembler::Fail:
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73 SM.PrintMessage(SMLoc::getFromPointer(Bytes[Index].second),
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74 SourceMgr::DK_Warning,
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75 "invalid instruction encoding");
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76 // Don't try to resynchronise the stream in a block
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77 if (InAtomicBlock)
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78 return true;
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79
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80 if (Size == 0)
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81 Size = 1; // skip illegible bytes
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82
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83 break;
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84
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85 case MCDisassembler::SoftFail:
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86 SM.PrintMessage(SMLoc::getFromPointer(Bytes[Index].second),
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87 SourceMgr::DK_Warning,
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88 "potentially undefined instruction encoding");
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89 // Fall through
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90
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91 case MCDisassembler::Success:
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92 Streamer.EmitInstruction(Inst, STI);
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93 break;
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94 }
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95 }
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96
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97 return false;
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98 }
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99
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100 static bool SkipToToken(StringRef &Str) {
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101 while (!Str.empty() && Str.find_first_not_of(" \t\r\n#,") != 0) {
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102 // Strip horizontal whitespace and commas.
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103 if (size_t Pos = Str.find_first_not_of(" \t\r,")) {
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104 Str = Str.substr(Pos);
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105 }
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106
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107 // If this is the end of a line or start of a comment, remove the rest of
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108 // the line.
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109 if (Str[0] == '\n' || Str[0] == '#') {
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110 // Strip to the end of line if we already processed any bytes on this
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111 // line. This strips the comment and/or the \n.
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112 if (Str[0] == '\n') {
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113 Str = Str.substr(1);
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114 } else {
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115 Str = Str.substr(Str.find_first_of('\n'));
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116 if (!Str.empty())
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117 Str = Str.substr(1);
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118 }
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119 continue;
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120 }
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121 }
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122
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123 return !Str.empty();
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124 }
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125
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126
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127 static bool ByteArrayFromString(ByteArrayTy &ByteArray,
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128 StringRef &Str,
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129 SourceMgr &SM) {
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130 while (SkipToToken(Str)) {
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131 // Handled by higher level
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parents:
diff changeset
132 if (Str[0] == '[' || Str[0] == ']')
95c75e76d11b LLVM 3.4
Kaito Tokumori <e105711@ie.u-ryukyu.ac.jp>
parents:
diff changeset
133 return false;
95c75e76d11b LLVM 3.4
Kaito Tokumori <e105711@ie.u-ryukyu.ac.jp>
parents:
diff changeset
134
95c75e76d11b LLVM 3.4
Kaito Tokumori <e105711@ie.u-ryukyu.ac.jp>
parents:
diff changeset
135 // Get the current token.
95c75e76d11b LLVM 3.4
Kaito Tokumori <e105711@ie.u-ryukyu.ac.jp>
parents:
diff changeset
136 size_t Next = Str.find_first_of(" \t\n\r,#[]");
95c75e76d11b LLVM 3.4
Kaito Tokumori <e105711@ie.u-ryukyu.ac.jp>
parents:
diff changeset
137 StringRef Value = Str.substr(0, Next);
95c75e76d11b LLVM 3.4
Kaito Tokumori <e105711@ie.u-ryukyu.ac.jp>
parents:
diff changeset
138
95c75e76d11b LLVM 3.4
Kaito Tokumori <e105711@ie.u-ryukyu.ac.jp>
parents:
diff changeset
139 // Convert to a byte and add to the byte vector.
95c75e76d11b LLVM 3.4
Kaito Tokumori <e105711@ie.u-ryukyu.ac.jp>
parents:
diff changeset
140 unsigned ByteVal;
95c75e76d11b LLVM 3.4
Kaito Tokumori <e105711@ie.u-ryukyu.ac.jp>
parents:
diff changeset
141 if (Value.getAsInteger(0, ByteVal) || ByteVal > 255) {
95c75e76d11b LLVM 3.4
Kaito Tokumori <e105711@ie.u-ryukyu.ac.jp>
parents:
diff changeset
142 // If we have an error, print it and skip to the end of line.
95c75e76d11b LLVM 3.4
Kaito Tokumori <e105711@ie.u-ryukyu.ac.jp>
parents:
diff changeset
143 SM.PrintMessage(SMLoc::getFromPointer(Value.data()), SourceMgr::DK_Error,
95c75e76d11b LLVM 3.4
Kaito Tokumori <e105711@ie.u-ryukyu.ac.jp>
parents:
diff changeset
144 "invalid input token");
95c75e76d11b LLVM 3.4
Kaito Tokumori <e105711@ie.u-ryukyu.ac.jp>
parents:
diff changeset
145 Str = Str.substr(Str.find('\n'));
95c75e76d11b LLVM 3.4
Kaito Tokumori <e105711@ie.u-ryukyu.ac.jp>
parents:
diff changeset
146 ByteArray.clear();
95c75e76d11b LLVM 3.4
Kaito Tokumori <e105711@ie.u-ryukyu.ac.jp>
parents:
diff changeset
147 continue;
95c75e76d11b LLVM 3.4
Kaito Tokumori <e105711@ie.u-ryukyu.ac.jp>
parents:
diff changeset
148 }
95c75e76d11b LLVM 3.4
Kaito Tokumori <e105711@ie.u-ryukyu.ac.jp>
parents:
diff changeset
149
95c75e76d11b LLVM 3.4
Kaito Tokumori <e105711@ie.u-ryukyu.ac.jp>
parents:
diff changeset
150 ByteArray.push_back(std::make_pair((unsigned char)ByteVal, Value.data()));
95c75e76d11b LLVM 3.4
Kaito Tokumori <e105711@ie.u-ryukyu.ac.jp>
parents:
diff changeset
151 Str = Str.substr(Next);
95c75e76d11b LLVM 3.4
Kaito Tokumori <e105711@ie.u-ryukyu.ac.jp>
parents:
diff changeset
152 }
95c75e76d11b LLVM 3.4
Kaito Tokumori <e105711@ie.u-ryukyu.ac.jp>
parents:
diff changeset
153
95c75e76d11b LLVM 3.4
Kaito Tokumori <e105711@ie.u-ryukyu.ac.jp>
parents:
diff changeset
154 return false;
95c75e76d11b LLVM 3.4
Kaito Tokumori <e105711@ie.u-ryukyu.ac.jp>
parents:
diff changeset
155 }
95c75e76d11b LLVM 3.4
Kaito Tokumori <e105711@ie.u-ryukyu.ac.jp>
parents:
diff changeset
156
95c75e76d11b LLVM 3.4
Kaito Tokumori <e105711@ie.u-ryukyu.ac.jp>
parents:
diff changeset
157 int Disassembler::disassemble(const Target &T,
95c75e76d11b LLVM 3.4
Kaito Tokumori <e105711@ie.u-ryukyu.ac.jp>
parents:
diff changeset
158 const std::string &Triple,
95c75e76d11b LLVM 3.4
Kaito Tokumori <e105711@ie.u-ryukyu.ac.jp>
parents:
diff changeset
159 MCSubtargetInfo &STI,
95c75e76d11b LLVM 3.4
Kaito Tokumori <e105711@ie.u-ryukyu.ac.jp>
parents:
diff changeset
160 MCStreamer &Streamer,
95c75e76d11b LLVM 3.4
Kaito Tokumori <e105711@ie.u-ryukyu.ac.jp>
parents:
diff changeset
161 MemoryBuffer &Buffer,
95c75e76d11b LLVM 3.4
Kaito Tokumori <e105711@ie.u-ryukyu.ac.jp>
parents:
diff changeset
162 SourceMgr &SM,
95c75e76d11b LLVM 3.4
Kaito Tokumori <e105711@ie.u-ryukyu.ac.jp>
parents:
diff changeset
163 raw_ostream &Out) {
77
54457678186b LLVM 3.6
Kaito Tokumori <e105711@ie.u-ryukyu.ac.jp>
parents: 0
diff changeset
164
54457678186b LLVM 3.6
Kaito Tokumori <e105711@ie.u-ryukyu.ac.jp>
parents: 0
diff changeset
165 std::unique_ptr<const MCRegisterInfo> MRI(T.createMCRegInfo(Triple));
54457678186b LLVM 3.6
Kaito Tokumori <e105711@ie.u-ryukyu.ac.jp>
parents: 0
diff changeset
166 if (!MRI) {
54457678186b LLVM 3.6
Kaito Tokumori <e105711@ie.u-ryukyu.ac.jp>
parents: 0
diff changeset
167 errs() << "error: no register info for target " << Triple << "\n";
54457678186b LLVM 3.6
Kaito Tokumori <e105711@ie.u-ryukyu.ac.jp>
parents: 0
diff changeset
168 return -1;
54457678186b LLVM 3.6
Kaito Tokumori <e105711@ie.u-ryukyu.ac.jp>
parents: 0
diff changeset
169 }
54457678186b LLVM 3.6
Kaito Tokumori <e105711@ie.u-ryukyu.ac.jp>
parents: 0
diff changeset
170
54457678186b LLVM 3.6
Kaito Tokumori <e105711@ie.u-ryukyu.ac.jp>
parents: 0
diff changeset
171 std::unique_ptr<const MCAsmInfo> MAI(T.createMCAsmInfo(*MRI, Triple));
54457678186b LLVM 3.6
Kaito Tokumori <e105711@ie.u-ryukyu.ac.jp>
parents: 0
diff changeset
172 if (!MAI) {
54457678186b LLVM 3.6
Kaito Tokumori <e105711@ie.u-ryukyu.ac.jp>
parents: 0
diff changeset
173 errs() << "error: no assembly info for target " << Triple << "\n";
54457678186b LLVM 3.6
Kaito Tokumori <e105711@ie.u-ryukyu.ac.jp>
parents: 0
diff changeset
174 return -1;
54457678186b LLVM 3.6
Kaito Tokumori <e105711@ie.u-ryukyu.ac.jp>
parents: 0
diff changeset
175 }
54457678186b LLVM 3.6
Kaito Tokumori <e105711@ie.u-ryukyu.ac.jp>
parents: 0
diff changeset
176
54457678186b LLVM 3.6
Kaito Tokumori <e105711@ie.u-ryukyu.ac.jp>
parents: 0
diff changeset
177 // Set up the MCContext for creating symbols and MCExpr's.
54457678186b LLVM 3.6
Kaito Tokumori <e105711@ie.u-ryukyu.ac.jp>
parents: 0
diff changeset
178 MCContext Ctx(MAI.get(), MRI.get(), nullptr);
54457678186b LLVM 3.6
Kaito Tokumori <e105711@ie.u-ryukyu.ac.jp>
parents: 0
diff changeset
179
54457678186b LLVM 3.6
Kaito Tokumori <e105711@ie.u-ryukyu.ac.jp>
parents: 0
diff changeset
180 std::unique_ptr<const MCDisassembler> DisAsm(
54457678186b LLVM 3.6
Kaito Tokumori <e105711@ie.u-ryukyu.ac.jp>
parents: 0
diff changeset
181 T.createMCDisassembler(STI, Ctx));
0
95c75e76d11b LLVM 3.4
Kaito Tokumori <e105711@ie.u-ryukyu.ac.jp>
parents:
diff changeset
182 if (!DisAsm) {
95c75e76d11b LLVM 3.4
Kaito Tokumori <e105711@ie.u-ryukyu.ac.jp>
parents:
diff changeset
183 errs() << "error: no disassembler for target " << Triple << "\n";
95c75e76d11b LLVM 3.4
Kaito Tokumori <e105711@ie.u-ryukyu.ac.jp>
parents:
diff changeset
184 return -1;
95c75e76d11b LLVM 3.4
Kaito Tokumori <e105711@ie.u-ryukyu.ac.jp>
parents:
diff changeset
185 }
95c75e76d11b LLVM 3.4
Kaito Tokumori <e105711@ie.u-ryukyu.ac.jp>
parents:
diff changeset
186
95c75e76d11b LLVM 3.4
Kaito Tokumori <e105711@ie.u-ryukyu.ac.jp>
parents:
diff changeset
187 // Set up initial section manually here
95c75e76d11b LLVM 3.4
Kaito Tokumori <e105711@ie.u-ryukyu.ac.jp>
parents:
diff changeset
188 Streamer.InitSections();
95c75e76d11b LLVM 3.4
Kaito Tokumori <e105711@ie.u-ryukyu.ac.jp>
parents:
diff changeset
189
95c75e76d11b LLVM 3.4
Kaito Tokumori <e105711@ie.u-ryukyu.ac.jp>
parents:
diff changeset
190 bool ErrorOccurred = false;
95c75e76d11b LLVM 3.4
Kaito Tokumori <e105711@ie.u-ryukyu.ac.jp>
parents:
diff changeset
191
95c75e76d11b LLVM 3.4
Kaito Tokumori <e105711@ie.u-ryukyu.ac.jp>
parents:
diff changeset
192 // Convert the input to a vector for disassembly.
95c75e76d11b LLVM 3.4
Kaito Tokumori <e105711@ie.u-ryukyu.ac.jp>
parents:
diff changeset
193 ByteArrayTy ByteArray;
95c75e76d11b LLVM 3.4
Kaito Tokumori <e105711@ie.u-ryukyu.ac.jp>
parents:
diff changeset
194 StringRef Str = Buffer.getBuffer();
95c75e76d11b LLVM 3.4
Kaito Tokumori <e105711@ie.u-ryukyu.ac.jp>
parents:
diff changeset
195 bool InAtomicBlock = false;
95c75e76d11b LLVM 3.4
Kaito Tokumori <e105711@ie.u-ryukyu.ac.jp>
parents:
diff changeset
196
95c75e76d11b LLVM 3.4
Kaito Tokumori <e105711@ie.u-ryukyu.ac.jp>
parents:
diff changeset
197 while (SkipToToken(Str)) {
95c75e76d11b LLVM 3.4
Kaito Tokumori <e105711@ie.u-ryukyu.ac.jp>
parents:
diff changeset
198 ByteArray.clear();
95c75e76d11b LLVM 3.4
Kaito Tokumori <e105711@ie.u-ryukyu.ac.jp>
parents:
diff changeset
199
95c75e76d11b LLVM 3.4
Kaito Tokumori <e105711@ie.u-ryukyu.ac.jp>
parents:
diff changeset
200 if (Str[0] == '[') {
95c75e76d11b LLVM 3.4
Kaito Tokumori <e105711@ie.u-ryukyu.ac.jp>
parents:
diff changeset
201 if (InAtomicBlock) {
95c75e76d11b LLVM 3.4
Kaito Tokumori <e105711@ie.u-ryukyu.ac.jp>
parents:
diff changeset
202 SM.PrintMessage(SMLoc::getFromPointer(Str.data()), SourceMgr::DK_Error,
95c75e76d11b LLVM 3.4
Kaito Tokumori <e105711@ie.u-ryukyu.ac.jp>
parents:
diff changeset
203 "nested atomic blocks make no sense");
95c75e76d11b LLVM 3.4
Kaito Tokumori <e105711@ie.u-ryukyu.ac.jp>
parents:
diff changeset
204 ErrorOccurred = true;
95c75e76d11b LLVM 3.4
Kaito Tokumori <e105711@ie.u-ryukyu.ac.jp>
parents:
diff changeset
205 }
95c75e76d11b LLVM 3.4
Kaito Tokumori <e105711@ie.u-ryukyu.ac.jp>
parents:
diff changeset
206 InAtomicBlock = true;
95c75e76d11b LLVM 3.4
Kaito Tokumori <e105711@ie.u-ryukyu.ac.jp>
parents:
diff changeset
207 Str = Str.drop_front();
95c75e76d11b LLVM 3.4
Kaito Tokumori <e105711@ie.u-ryukyu.ac.jp>
parents:
diff changeset
208 continue;
95c75e76d11b LLVM 3.4
Kaito Tokumori <e105711@ie.u-ryukyu.ac.jp>
parents:
diff changeset
209 } else if (Str[0] == ']') {
95c75e76d11b LLVM 3.4
Kaito Tokumori <e105711@ie.u-ryukyu.ac.jp>
parents:
diff changeset
210 if (!InAtomicBlock) {
95c75e76d11b LLVM 3.4
Kaito Tokumori <e105711@ie.u-ryukyu.ac.jp>
parents:
diff changeset
211 SM.PrintMessage(SMLoc::getFromPointer(Str.data()), SourceMgr::DK_Error,
95c75e76d11b LLVM 3.4
Kaito Tokumori <e105711@ie.u-ryukyu.ac.jp>
parents:
diff changeset
212 "attempt to close atomic block without opening");
95c75e76d11b LLVM 3.4
Kaito Tokumori <e105711@ie.u-ryukyu.ac.jp>
parents:
diff changeset
213 ErrorOccurred = true;
95c75e76d11b LLVM 3.4
Kaito Tokumori <e105711@ie.u-ryukyu.ac.jp>
parents:
diff changeset
214 }
95c75e76d11b LLVM 3.4
Kaito Tokumori <e105711@ie.u-ryukyu.ac.jp>
parents:
diff changeset
215 InAtomicBlock = false;
95c75e76d11b LLVM 3.4
Kaito Tokumori <e105711@ie.u-ryukyu.ac.jp>
parents:
diff changeset
216 Str = Str.drop_front();
95c75e76d11b LLVM 3.4
Kaito Tokumori <e105711@ie.u-ryukyu.ac.jp>
parents:
diff changeset
217 continue;
95c75e76d11b LLVM 3.4
Kaito Tokumori <e105711@ie.u-ryukyu.ac.jp>
parents:
diff changeset
218 }
95c75e76d11b LLVM 3.4
Kaito Tokumori <e105711@ie.u-ryukyu.ac.jp>
parents:
diff changeset
219
95c75e76d11b LLVM 3.4
Kaito Tokumori <e105711@ie.u-ryukyu.ac.jp>
parents:
diff changeset
220 // It's a real token, get the bytes and emit them
95c75e76d11b LLVM 3.4
Kaito Tokumori <e105711@ie.u-ryukyu.ac.jp>
parents:
diff changeset
221 ErrorOccurred |= ByteArrayFromString(ByteArray, Str, SM);
95c75e76d11b LLVM 3.4
Kaito Tokumori <e105711@ie.u-ryukyu.ac.jp>
parents:
diff changeset
222
95c75e76d11b LLVM 3.4
Kaito Tokumori <e105711@ie.u-ryukyu.ac.jp>
parents:
diff changeset
223 if (!ByteArray.empty())
95c75e76d11b LLVM 3.4
Kaito Tokumori <e105711@ie.u-ryukyu.ac.jp>
parents:
diff changeset
224 ErrorOccurred |= PrintInsts(*DisAsm, ByteArray, SM, Out, Streamer,
77
54457678186b LLVM 3.6
Kaito Tokumori <e105711@ie.u-ryukyu.ac.jp>
parents: 0
diff changeset
225 InAtomicBlock, STI);
0
95c75e76d11b LLVM 3.4
Kaito Tokumori <e105711@ie.u-ryukyu.ac.jp>
parents:
diff changeset
226 }
95c75e76d11b LLVM 3.4
Kaito Tokumori <e105711@ie.u-ryukyu.ac.jp>
parents:
diff changeset
227
95c75e76d11b LLVM 3.4
Kaito Tokumori <e105711@ie.u-ryukyu.ac.jp>
parents:
diff changeset
228 if (InAtomicBlock) {
95c75e76d11b LLVM 3.4
Kaito Tokumori <e105711@ie.u-ryukyu.ac.jp>
parents:
diff changeset
229 SM.PrintMessage(SMLoc::getFromPointer(Str.data()), SourceMgr::DK_Error,
95c75e76d11b LLVM 3.4
Kaito Tokumori <e105711@ie.u-ryukyu.ac.jp>
parents:
diff changeset
230 "unclosed atomic block");
95c75e76d11b LLVM 3.4
Kaito Tokumori <e105711@ie.u-ryukyu.ac.jp>
parents:
diff changeset
231 ErrorOccurred = true;
95c75e76d11b LLVM 3.4
Kaito Tokumori <e105711@ie.u-ryukyu.ac.jp>
parents:
diff changeset
232 }
95c75e76d11b LLVM 3.4
Kaito Tokumori <e105711@ie.u-ryukyu.ac.jp>
parents:
diff changeset
233
95c75e76d11b LLVM 3.4
Kaito Tokumori <e105711@ie.u-ryukyu.ac.jp>
parents:
diff changeset
234 return ErrorOccurred;
95c75e76d11b LLVM 3.4
Kaito Tokumori <e105711@ie.u-ryukyu.ac.jp>
parents:
diff changeset
235 }