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annotate tools/llvm-mc/Disassembler.cpp @ 147:c2174574ed3a

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LLVM 10
author Shinji KONO <kono@ie.u-ryukyu.ac.jp>
date Wed, 14 Aug 2019 16:55:33 +0900
parents 1172e4bd9c6f
children
Ignore whitespace changes - Everywhere: Within whitespace: At end of lines:
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1 //===- Disassembler.cpp - Disassembler for hex strings --------------------===//
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2 //
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3 // Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
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4 // See https://llvm.org/LICENSE.txt for license information.
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5 // SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
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6 //
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7 //===----------------------------------------------------------------------===//
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8 //
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9 // This class implements the disassembler of strings of bytes written in
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10 // hexadecimal, from standard input or from a file.
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11 //
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12 //===----------------------------------------------------------------------===//
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13
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14 #include "Disassembler.h"
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15 #include "llvm/ADT/Triple.h"
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16 #include "llvm/MC/MCAsmInfo.h"
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17 #include "llvm/MC/MCContext.h"
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18 #include "llvm/MC/MCDisassembler/MCDisassembler.h"
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19 #include "llvm/MC/MCInst.h"
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20 #include "llvm/MC/MCRegisterInfo.h"
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21 #include "llvm/MC/MCStreamer.h"
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22 #include "llvm/MC/MCSubtargetInfo.h"
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23 #include "llvm/Support/MemoryBuffer.h"
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24 #include "llvm/Support/SourceMgr.h"
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25 #include "llvm/Support/TargetRegistry.h"
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26 #include "llvm/Support/raw_ostream.h"
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27
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28 using namespace llvm;
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29
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30 typedef std::pair<std::vector<unsigned char>, std::vector<const char *>>
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31 ByteArrayTy;
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32
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33 static bool PrintInsts(const MCDisassembler &DisAsm,
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34 const ByteArrayTy &Bytes,
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35 SourceMgr &SM, raw_ostream &Out,
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36 MCStreamer &Streamer, bool InAtomicBlock,
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37 const MCSubtargetInfo &STI) {
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38 ArrayRef<uint8_t> Data(Bytes.first.data(), Bytes.first.size());
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39
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40 // Disassemble it to strings.
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41 uint64_t Size;
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42 uint64_t Index;
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43
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44 for (Index = 0; Index < Bytes.first.size(); Index += Size) {
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45 MCInst Inst;
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46
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47 MCDisassembler::DecodeStatus S;
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48 S = DisAsm.getInstruction(Inst, Size, Data.slice(Index), Index,
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49 /*REMOVE*/ nulls(), nulls());
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50 switch (S) {
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51 case MCDisassembler::Fail:
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52 SM.PrintMessage(SMLoc::getFromPointer(Bytes.second[Index]),
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53 SourceMgr::DK_Warning,
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54 "invalid instruction encoding");
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55 // Don't try to resynchronise the stream in a block
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56 if (InAtomicBlock)
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57 return true;
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58
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59 if (Size == 0)
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60 Size = 1; // skip illegible bytes
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61
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62 break;
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63
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64 case MCDisassembler::SoftFail:
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65 SM.PrintMessage(SMLoc::getFromPointer(Bytes.second[Index]),
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66 SourceMgr::DK_Warning,
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67 "potentially undefined instruction encoding");
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68 LLVM_FALLTHROUGH;
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69
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70 case MCDisassembler::Success:
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71 Streamer.EmitInstruction(Inst, STI);
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72 break;
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73 }
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74 }
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75
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76 return false;
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77 }
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78
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79 static bool SkipToToken(StringRef &Str) {
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80 for (;;) {
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81 if (Str.empty())
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82 return false;
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83
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84 // Strip horizontal whitespace and commas.
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85 if (size_t Pos = Str.find_first_not_of(" \t\r\n,")) {
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86 Str = Str.substr(Pos);
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87 continue;
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88 }
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89
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90 // If this is the start of a comment, remove the rest of the line.
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91 if (Str[0] == '#') {
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92 Str = Str.substr(Str.find_first_of('\n'));
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93 continue;
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94 }
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95 return true;
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96 }
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97 }
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99
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100 static bool ByteArrayFromString(ByteArrayTy &ByteArray,
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101 StringRef &Str,
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102 SourceMgr &SM) {
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103 while (SkipToToken(Str)) {
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104 // Handled by higher level
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105 if (Str[0] == '[' || Str[0] == ']')
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106 return false;
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107
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108 // Get the current token.
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109 size_t Next = Str.find_first_of(" \t\n\r,#[]");
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110 StringRef Value = Str.substr(0, Next);
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111
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112 // Convert to a byte and add to the byte vector.
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113 unsigned ByteVal;
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114 if (Value.getAsInteger(0, ByteVal) || ByteVal > 255) {
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115 // If we have an error, print it and skip to the end of line.
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116 SM.PrintMessage(SMLoc::getFromPointer(Value.data()), SourceMgr::DK_Error,
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117 "invalid input token");
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118 Str = Str.substr(Str.find('\n'));
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119 ByteArray.first.clear();
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120 ByteArray.second.clear();
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121 continue;
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122 }
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123
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124 ByteArray.first.push_back(ByteVal);
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125 ByteArray.second.push_back(Value.data());
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126 Str = Str.substr(Next);
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127 }
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128
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129 return false;
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130 }
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131
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132 int Disassembler::disassemble(const Target &T,
95c75e76d11b LLVM 3.4
Kaito Tokumori <e105711@ie.u-ryukyu.ac.jp>
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133 const std::string &Triple,
95c75e76d11b LLVM 3.4
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134 MCSubtargetInfo &STI,
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Kaito Tokumori <e105711@ie.u-ryukyu.ac.jp>
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135 MCStreamer &Streamer,
95c75e76d11b LLVM 3.4
Kaito Tokumori <e105711@ie.u-ryukyu.ac.jp>
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136 MemoryBuffer &Buffer,
95c75e76d11b LLVM 3.4
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137 SourceMgr &SM,
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138 raw_ostream &Out) {
77
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parents: 0
diff changeset
139
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Kaito Tokumori <e105711@ie.u-ryukyu.ac.jp>
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140 std::unique_ptr<const MCRegisterInfo> MRI(T.createMCRegInfo(Triple));
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Kaito Tokumori <e105711@ie.u-ryukyu.ac.jp>
parents: 0
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141 if (!MRI) {
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parents: 0
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142 errs() << "error: no register info for target " << Triple << "\n";
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parents: 0
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143 return -1;
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parents: 0
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144 }
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parents: 0
diff changeset
145
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parents: 0
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146 std::unique_ptr<const MCAsmInfo> MAI(T.createMCAsmInfo(*MRI, Triple));
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Kaito Tokumori <e105711@ie.u-ryukyu.ac.jp>
parents: 0
diff changeset
147 if (!MAI) {
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Kaito Tokumori <e105711@ie.u-ryukyu.ac.jp>
parents: 0
diff changeset
148 errs() << "error: no assembly info for target " << Triple << "\n";
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Kaito Tokumori <e105711@ie.u-ryukyu.ac.jp>
parents: 0
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149 return -1;
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parents: 0
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150 }
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parents: 0
diff changeset
151
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diff changeset
152 // Set up the MCContext for creating symbols and MCExpr's.
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parents: 0
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153 MCContext Ctx(MAI.get(), MRI.get(), nullptr);
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154
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diff changeset
155 std::unique_ptr<const MCDisassembler> DisAsm(
54457678186b LLVM 3.6
Kaito Tokumori <e105711@ie.u-ryukyu.ac.jp>
parents: 0
diff changeset
156 T.createMCDisassembler(STI, Ctx));
0
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Kaito Tokumori <e105711@ie.u-ryukyu.ac.jp>
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diff changeset
157 if (!DisAsm) {
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diff changeset
158 errs() << "error: no disassembler for target " << Triple << "\n";
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parents:
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159 return -1;
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160 }
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parents:
diff changeset
161
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parents:
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162 // Set up initial section manually here
83
60c9769439b8 LLVM 3.7
Tatsuki IHA <e125716@ie.u-ryukyu.ac.jp>
parents: 77
diff changeset
163 Streamer.InitSections(false);
0
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164
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165 bool ErrorOccurred = false;
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parents:
diff changeset
166
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167 // Convert the input to a vector for disassembly.
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parents:
diff changeset
168 ByteArrayTy ByteArray;
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parents:
diff changeset
169 StringRef Str = Buffer.getBuffer();
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parents:
diff changeset
170 bool InAtomicBlock = false;
95c75e76d11b LLVM 3.4
Kaito Tokumori <e105711@ie.u-ryukyu.ac.jp>
parents:
diff changeset
171
95c75e76d11b LLVM 3.4
Kaito Tokumori <e105711@ie.u-ryukyu.ac.jp>
parents:
diff changeset
172 while (SkipToToken(Str)) {
83
60c9769439b8 LLVM 3.7
Tatsuki IHA <e125716@ie.u-ryukyu.ac.jp>
parents: 77
diff changeset
173 ByteArray.first.clear();
60c9769439b8 LLVM 3.7
Tatsuki IHA <e125716@ie.u-ryukyu.ac.jp>
parents: 77
diff changeset
174 ByteArray.second.clear();
0
95c75e76d11b LLVM 3.4
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parents:
diff changeset
175
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Kaito Tokumori <e105711@ie.u-ryukyu.ac.jp>
parents:
diff changeset
176 if (Str[0] == '[') {
95c75e76d11b LLVM 3.4
Kaito Tokumori <e105711@ie.u-ryukyu.ac.jp>
parents:
diff changeset
177 if (InAtomicBlock) {
95c75e76d11b LLVM 3.4
Kaito Tokumori <e105711@ie.u-ryukyu.ac.jp>
parents:
diff changeset
178 SM.PrintMessage(SMLoc::getFromPointer(Str.data()), SourceMgr::DK_Error,
95c75e76d11b LLVM 3.4
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parents:
diff changeset
179 "nested atomic blocks make no sense");
95c75e76d11b LLVM 3.4
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parents:
diff changeset
180 ErrorOccurred = true;
95c75e76d11b LLVM 3.4
Kaito Tokumori <e105711@ie.u-ryukyu.ac.jp>
parents:
diff changeset
181 }
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Kaito Tokumori <e105711@ie.u-ryukyu.ac.jp>
parents:
diff changeset
182 InAtomicBlock = true;
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Kaito Tokumori <e105711@ie.u-ryukyu.ac.jp>
parents:
diff changeset
183 Str = Str.drop_front();
95c75e76d11b LLVM 3.4
Kaito Tokumori <e105711@ie.u-ryukyu.ac.jp>
parents:
diff changeset
184 continue;
95c75e76d11b LLVM 3.4
Kaito Tokumori <e105711@ie.u-ryukyu.ac.jp>
parents:
diff changeset
185 } else if (Str[0] == ']') {
95c75e76d11b LLVM 3.4
Kaito Tokumori <e105711@ie.u-ryukyu.ac.jp>
parents:
diff changeset
186 if (!InAtomicBlock) {
95c75e76d11b LLVM 3.4
Kaito Tokumori <e105711@ie.u-ryukyu.ac.jp>
parents:
diff changeset
187 SM.PrintMessage(SMLoc::getFromPointer(Str.data()), SourceMgr::DK_Error,
95c75e76d11b LLVM 3.4
Kaito Tokumori <e105711@ie.u-ryukyu.ac.jp>
parents:
diff changeset
188 "attempt to close atomic block without opening");
95c75e76d11b LLVM 3.4
Kaito Tokumori <e105711@ie.u-ryukyu.ac.jp>
parents:
diff changeset
189 ErrorOccurred = true;
95c75e76d11b LLVM 3.4
Kaito Tokumori <e105711@ie.u-ryukyu.ac.jp>
parents:
diff changeset
190 }
95c75e76d11b LLVM 3.4
Kaito Tokumori <e105711@ie.u-ryukyu.ac.jp>
parents:
diff changeset
191 InAtomicBlock = false;
95c75e76d11b LLVM 3.4
Kaito Tokumori <e105711@ie.u-ryukyu.ac.jp>
parents:
diff changeset
192 Str = Str.drop_front();
95c75e76d11b LLVM 3.4
Kaito Tokumori <e105711@ie.u-ryukyu.ac.jp>
parents:
diff changeset
193 continue;
95c75e76d11b LLVM 3.4
Kaito Tokumori <e105711@ie.u-ryukyu.ac.jp>
parents:
diff changeset
194 }
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Kaito Tokumori <e105711@ie.u-ryukyu.ac.jp>
parents:
diff changeset
195
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parents:
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196 // 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
197 ErrorOccurred |= ByteArrayFromString(ByteArray, Str, SM);
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Kaito Tokumori <e105711@ie.u-ryukyu.ac.jp>
parents:
diff changeset
198
83
60c9769439b8 LLVM 3.7
Tatsuki IHA <e125716@ie.u-ryukyu.ac.jp>
parents: 77
diff changeset
199 if (!ByteArray.first.empty())
0
95c75e76d11b LLVM 3.4
Kaito Tokumori <e105711@ie.u-ryukyu.ac.jp>
parents:
diff changeset
200 ErrorOccurred |= PrintInsts(*DisAsm, ByteArray, SM, Out, Streamer,
77
54457678186b LLVM 3.6
Kaito Tokumori <e105711@ie.u-ryukyu.ac.jp>
parents: 0
diff changeset
201 InAtomicBlock, STI);
0
95c75e76d11b LLVM 3.4
Kaito Tokumori <e105711@ie.u-ryukyu.ac.jp>
parents:
diff changeset
202 }
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Kaito Tokumori <e105711@ie.u-ryukyu.ac.jp>
parents:
diff changeset
203
95c75e76d11b LLVM 3.4
Kaito Tokumori <e105711@ie.u-ryukyu.ac.jp>
parents:
diff changeset
204 if (InAtomicBlock) {
95c75e76d11b LLVM 3.4
Kaito Tokumori <e105711@ie.u-ryukyu.ac.jp>
parents:
diff changeset
205 SM.PrintMessage(SMLoc::getFromPointer(Str.data()), SourceMgr::DK_Error,
95c75e76d11b LLVM 3.4
Kaito Tokumori <e105711@ie.u-ryukyu.ac.jp>
parents:
diff changeset
206 "unclosed atomic block");
95c75e76d11b LLVM 3.4
Kaito Tokumori <e105711@ie.u-ryukyu.ac.jp>
parents:
diff changeset
207 ErrorOccurred = true;
95c75e76d11b LLVM 3.4
Kaito Tokumori <e105711@ie.u-ryukyu.ac.jp>
parents:
diff changeset
208 }
95c75e76d11b LLVM 3.4
Kaito Tokumori <e105711@ie.u-ryukyu.ac.jp>
parents:
diff changeset
209
95c75e76d11b LLVM 3.4
Kaito Tokumori <e105711@ie.u-ryukyu.ac.jp>
parents:
diff changeset
210 return ErrorOccurred;
95c75e76d11b LLVM 3.4
Kaito Tokumori <e105711@ie.u-ryukyu.ac.jp>
parents:
diff changeset
211 }