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annotate include/llvm/Bitcode/BitCodes.h @ 121:803732b1fca8

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LLVM 5.0
author kono
date Fri, 27 Oct 2017 17:07:41 +0900
parents 1172e4bd9c6f
children
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1 //===- BitCodes.h - Enum values for the bitcode format ----------*- C++ -*-===//
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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 header Bitcode enum values.
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11 //
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12 // The enum values defined in this file should be considered permanent. If
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13 // new features are added, they should have values added at the end of the
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14 // respective lists.
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15 //
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16 //===----------------------------------------------------------------------===//
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17
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18 #ifndef LLVM_BITCODE_BITCODES_H
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19 #define LLVM_BITCODE_BITCODES_H
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20
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21 #include "llvm/ADT/SmallVector.h"
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22 #include "llvm/Support/DataTypes.h"
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23 #include "llvm/Support/ErrorHandling.h"
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24 #include <cassert>
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25
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26 namespace llvm {
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27 /// Offsets of the 32-bit fields of bitcode wrapper header.
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28 static const unsigned BWH_MagicField = 0 * 4;
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29 static const unsigned BWH_VersionField = 1 * 4;
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30 static const unsigned BWH_OffsetField = 2 * 4;
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31 static const unsigned BWH_SizeField = 3 * 4;
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32 static const unsigned BWH_CPUTypeField = 4 * 4;
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33 static const unsigned BWH_HeaderSize = 5 * 4;
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34
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35 namespace bitc {
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36 enum StandardWidths {
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37 BlockIDWidth = 8, // We use VBR-8 for block IDs.
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38 CodeLenWidth = 4, // Codelen are VBR-4.
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39 BlockSizeWidth = 32 // BlockSize up to 2^32 32-bit words = 16GB per block.
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40 };
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41
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42 // The standard abbrev namespace always has a way to exit a block, enter a
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43 // nested block, define abbrevs, and define an unabbreviated record.
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44 enum FixedAbbrevIDs {
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45 END_BLOCK = 0, // Must be zero to guarantee termination for broken bitcode.
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46 ENTER_SUBBLOCK = 1,
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47
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48 /// DEFINE_ABBREV - Defines an abbrev for the current block. It consists
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49 /// of a vbr5 for # operand infos. Each operand info is emitted with a
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50 /// single bit to indicate if it is a literal encoding. If so, the value is
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51 /// emitted with a vbr8. If not, the encoding is emitted as 3 bits followed
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52 /// by the info value as a vbr5 if needed.
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53 DEFINE_ABBREV = 2,
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54
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55 // UNABBREV_RECORDs are emitted with a vbr6 for the record code, followed by
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56 // a vbr6 for the # operands, followed by vbr6's for each operand.
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57 UNABBREV_RECORD = 3,
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58
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59 // This is not a code, this is a marker for the first abbrev assignment.
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60 FIRST_APPLICATION_ABBREV = 4
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61 };
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62
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63 /// StandardBlockIDs - All bitcode files can optionally include a BLOCKINFO
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64 /// block, which contains metadata about other blocks in the file.
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65 enum StandardBlockIDs {
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66 /// BLOCKINFO_BLOCK is used to define metadata about blocks, for example,
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67 /// standard abbrevs that should be available to all blocks of a specified
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68 /// ID.
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69 BLOCKINFO_BLOCK_ID = 0,
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70
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71 // Block IDs 1-7 are reserved for future expansion.
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72 FIRST_APPLICATION_BLOCKID = 8
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73 };
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74
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75 /// BlockInfoCodes - The blockinfo block contains metadata about user-defined
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76 /// blocks.
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77 enum BlockInfoCodes {
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78 // DEFINE_ABBREV has magic semantics here, applying to the current SETBID'd
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79 // block, instead of the BlockInfo block.
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80
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81 BLOCKINFO_CODE_SETBID = 1, // SETBID: [blockid#]
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82 BLOCKINFO_CODE_BLOCKNAME = 2, // BLOCKNAME: [name]
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83 BLOCKINFO_CODE_SETRECORDNAME = 3 // BLOCKINFO_CODE_SETRECORDNAME:
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84 // [id, name]
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85 };
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86
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87 } // End bitc namespace
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88
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89 /// BitCodeAbbrevOp - This describes one or more operands in an abbreviation.
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90 /// This is actually a union of two different things:
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91 /// 1. It could be a literal integer value ("the operand is always 17").
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92 /// 2. It could be an encoding specification ("this operand encoded like so").
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93 ///
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94 class BitCodeAbbrevOp {
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95 uint64_t Val; // A literal value or data for an encoding.
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96 bool IsLiteral : 1; // Indicate whether this is a literal value or not.
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97 unsigned Enc : 3; // The encoding to use.
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98 public:
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99 enum Encoding {
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100 Fixed = 1, // A fixed width field, Val specifies number of bits.
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101 VBR = 2, // A VBR field where Val specifies the width of each chunk.
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102 Array = 3, // A sequence of fields, next field species elt encoding.
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103 Char6 = 4, // A 6-bit fixed field which maps to [a-zA-Z0-9._].
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104 Blob = 5 // 32-bit aligned array of 8-bit characters.
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105 };
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106
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107 explicit BitCodeAbbrevOp(uint64_t V) : Val(V), IsLiteral(true) {}
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108 explicit BitCodeAbbrevOp(Encoding E, uint64_t Data = 0)
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109 : Val(Data), IsLiteral(false), Enc(E) {}
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110
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111 bool isLiteral() const { return IsLiteral; }
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112 bool isEncoding() const { return !IsLiteral; }
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113
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114 // Accessors for literals.
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115 uint64_t getLiteralValue() const { assert(isLiteral()); return Val; }
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116
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117 // Accessors for encoding info.
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118 Encoding getEncoding() const { assert(isEncoding()); return (Encoding)Enc; }
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119 uint64_t getEncodingData() const {
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120 assert(isEncoding() && hasEncodingData());
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121 return Val;
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122 }
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123
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124 bool hasEncodingData() const { return hasEncodingData(getEncoding()); }
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125 static bool hasEncodingData(Encoding E) {
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126 switch (E) {
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127 case Fixed:
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128 case VBR:
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129 return true;
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130 case Array:
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131 case Char6:
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132 case Blob:
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133 return false;
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134 }
83
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135 report_fatal_error("Invalid encoding");
0
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136 }
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137
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138 /// isChar6 - Return true if this character is legal in the Char6 encoding.
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139 static bool isChar6(char C) {
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140 if (C >= 'a' && C <= 'z') return true;
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141 if (C >= 'A' && C <= 'Z') return true;
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142 if (C >= '0' && C <= '9') return true;
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143 if (C == '.' || C == '_') return true;
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144 return false;
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145 }
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146 static unsigned EncodeChar6(char C) {
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147 if (C >= 'a' && C <= 'z') return C-'a';
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148 if (C >= 'A' && C <= 'Z') return C-'A'+26;
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149 if (C >= '0' && C <= '9') return C-'0'+26+26;
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150 if (C == '.') return 62;
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151 if (C == '_') return 63;
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152 llvm_unreachable("Not a value Char6 character!");
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153 }
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154
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155 static char DecodeChar6(unsigned V) {
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156 assert((V & ~63) == 0 && "Not a Char6 encoded character!");
120
1172e4bd9c6f update 4.0.0
mir3636
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diff changeset
157 return "abcdefghijklmnopqrstuvwxyzABCDEFGHIJKLMNOPQRSTUVWXYZ0123456789._"
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parents: 95
diff changeset
158 [V];
0
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159 }
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160
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161 };
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162
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163 template <> struct isPodLike<BitCodeAbbrevOp> { static const bool value=true; };
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164
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165 /// BitCodeAbbrev - This class represents an abbreviation record. An
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166 /// abbreviation allows a complex record that has redundancy to be stored in a
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parents:
diff changeset
167 /// specialized format instead of the fully-general, fully-vbr, format.
121
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kono
parents: 120
diff changeset
168 class BitCodeAbbrev {
0
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diff changeset
169 SmallVector<BitCodeAbbrevOp, 32> OperandList;
83
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diff changeset
170
0
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parents:
diff changeset
171 public:
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parents:
diff changeset
172 unsigned getNumOperandInfos() const {
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diff changeset
173 return static_cast<unsigned>(OperandList.size());
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parents:
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174 }
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parents:
diff changeset
175 const BitCodeAbbrevOp &getOperandInfo(unsigned N) const {
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parents:
diff changeset
176 return OperandList[N];
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177 }
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178
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parents:
diff changeset
179 void Add(const BitCodeAbbrevOp &OpInfo) {
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180 OperandList.push_back(OpInfo);
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parents:
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181 }
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parents:
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182 };
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parents:
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183 } // End llvm namespace
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184
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parents:
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185 #endif