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annotate include/llvm/Bitcode/BitCodes.h @ 83:60c9769439b8 LLVM3.7

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LLVM 3.7
author Tatsuki IHA <e125716@ie.u-ryukyu.ac.jp>
date Wed, 18 Feb 2015 14:55:36 +0900
parents 95c75e76d11b
children afa8332a0e37
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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/IntrusiveRefCntPtr.h"
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22 #include "llvm/ADT/SmallVector.h"
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23 #include "llvm/Support/DataTypes.h"
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24 #include "llvm/Support/ErrorHandling.h"
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25 #include <cassert>
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26
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27 namespace llvm {
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28 namespace bitc {
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29 enum StandardWidths {
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30 BlockIDWidth = 8, // We use VBR-8 for block IDs.
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31 CodeLenWidth = 4, // Codelen are VBR-4.
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32 BlockSizeWidth = 32 // BlockSize up to 2^32 32-bit words = 16GB per block.
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33 };
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34
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35 // The standard abbrev namespace always has a way to exit a block, enter a
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36 // nested block, define abbrevs, and define an unabbreviated record.
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37 enum FixedAbbrevIDs {
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38 END_BLOCK = 0, // Must be zero to guarantee termination for broken bitcode.
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39 ENTER_SUBBLOCK = 1,
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40
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41 /// DEFINE_ABBREV - Defines an abbrev for the current block. It consists
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42 /// of a vbr5 for # operand infos. Each operand info is emitted with a
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43 /// single bit to indicate if it is a literal encoding. If so, the value is
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44 /// emitted with a vbr8. If not, the encoding is emitted as 3 bits followed
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45 /// by the info value as a vbr5 if needed.
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46 DEFINE_ABBREV = 2,
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47
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48 // UNABBREV_RECORDs are emitted with a vbr6 for the record code, followed by
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49 // a vbr6 for the # operands, followed by vbr6's for each operand.
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50 UNABBREV_RECORD = 3,
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51
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52 // This is not a code, this is a marker for the first abbrev assignment.
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53 FIRST_APPLICATION_ABBREV = 4
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54 };
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55
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56 /// StandardBlockIDs - All bitcode files can optionally include a BLOCKINFO
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57 /// block, which contains metadata about other blocks in the file.
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58 enum StandardBlockIDs {
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59 /// BLOCKINFO_BLOCK is used to define metadata about blocks, for example,
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60 /// standard abbrevs that should be available to all blocks of a specified
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61 /// ID.
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62 BLOCKINFO_BLOCK_ID = 0,
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63
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64 // Block IDs 1-7 are reserved for future expansion.
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65 FIRST_APPLICATION_BLOCKID = 8
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66 };
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67
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68 /// BlockInfoCodes - The blockinfo block contains metadata about user-defined
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69 /// blocks.
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70 enum BlockInfoCodes {
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71 // DEFINE_ABBREV has magic semantics here, applying to the current SETBID'd
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72 // block, instead of the BlockInfo block.
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73
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74 BLOCKINFO_CODE_SETBID = 1, // SETBID: [blockid#]
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75 BLOCKINFO_CODE_BLOCKNAME = 2, // BLOCKNAME: [name]
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76 BLOCKINFO_CODE_SETRECORDNAME = 3 // BLOCKINFO_CODE_SETRECORDNAME:
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77 // [id, name]
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78 };
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79
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80 } // End bitc namespace
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81
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82 /// BitCodeAbbrevOp - This describes one or more operands in an abbreviation.
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83 /// This is actually a union of two different things:
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84 /// 1. It could be a literal integer value ("the operand is always 17").
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85 /// 2. It could be an encoding specification ("this operand encoded like so").
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86 ///
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87 class BitCodeAbbrevOp {
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88 uint64_t Val; // A literal value or data for an encoding.
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89 bool IsLiteral : 1; // Indicate whether this is a literal value or not.
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90 unsigned Enc : 3; // The encoding to use.
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91 public:
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92 enum Encoding {
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93 Fixed = 1, // A fixed width field, Val specifies number of bits.
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94 VBR = 2, // A VBR field where Val specifies the width of each chunk.
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95 Array = 3, // A sequence of fields, next field species elt encoding.
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96 Char6 = 4, // A 6-bit fixed field which maps to [a-zA-Z0-9._].
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97 Blob = 5 // 32-bit aligned array of 8-bit characters.
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98 };
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99
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100 explicit BitCodeAbbrevOp(uint64_t V) : Val(V), IsLiteral(true) {}
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101 explicit BitCodeAbbrevOp(Encoding E, uint64_t Data = 0)
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102 : Val(Data), IsLiteral(false), Enc(E) {}
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103
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104 bool isLiteral() const { return IsLiteral; }
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105 bool isEncoding() const { return !IsLiteral; }
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106
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107 // Accessors for literals.
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108 uint64_t getLiteralValue() const { assert(isLiteral()); return Val; }
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109
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110 // Accessors for encoding info.
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111 Encoding getEncoding() const { assert(isEncoding()); return (Encoding)Enc; }
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112 uint64_t getEncodingData() const {
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113 assert(isEncoding() && hasEncodingData());
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114 return Val;
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115 }
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116
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117 bool hasEncodingData() const { return hasEncodingData(getEncoding()); }
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118 static bool hasEncodingData(Encoding E) {
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119 switch (E) {
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120 case Fixed:
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121 case VBR:
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122 return true;
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123 case Array:
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124 case Char6:
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125 case Blob:
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126 return false;
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127 }
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128 report_fatal_error("Invalid encoding");
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129 }
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130
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131 /// isChar6 - Return true if this character is legal in the Char6 encoding.
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132 static bool isChar6(char C) {
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133 if (C >= 'a' && C <= 'z') return true;
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134 if (C >= 'A' && C <= 'Z') return true;
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135 if (C >= '0' && C <= '9') return true;
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136 if (C == '.' || C == '_') return true;
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137 return false;
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138 }
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139 static unsigned EncodeChar6(char C) {
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140 if (C >= 'a' && C <= 'z') return C-'a';
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141 if (C >= 'A' && C <= 'Z') return C-'A'+26;
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142 if (C >= '0' && C <= '9') return C-'0'+26+26;
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143 if (C == '.') return 62;
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144 if (C == '_') return 63;
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145 llvm_unreachable("Not a value Char6 character!");
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146 }
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147
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148 static char DecodeChar6(unsigned V) {
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149 assert((V & ~63) == 0 && "Not a Char6 encoded character!");
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150 if (V < 26) return V+'a';
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151 if (V < 26+26) return V-26+'A';
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152 if (V < 26+26+10) return V-26-26+'0';
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153 if (V == 62) return '.';
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154 if (V == 63) return '_';
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155 llvm_unreachable("Not a value Char6 character!");
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156 }
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157
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158 };
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159
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160 template <> struct isPodLike<BitCodeAbbrevOp> { static const bool value=true; };
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161
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162 /// BitCodeAbbrev - This class represents an abbreviation record. An
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163 /// abbreviation allows a complex record that has redundancy to be stored in a
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164 /// specialized format instead of the fully-general, fully-vbr, format.
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165 class BitCodeAbbrev : public RefCountedBase<BitCodeAbbrev> {
0
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166 SmallVector<BitCodeAbbrevOp, 32> OperandList;
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167 ~BitCodeAbbrev() {}
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168 // Only RefCountedBase is allowed to delete.
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169 friend class RefCountedBase<BitCodeAbbrev>;
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170
0
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171 public:
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172 unsigned getNumOperandInfos() const {
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173 return static_cast<unsigned>(OperandList.size());
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174 }
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175 const BitCodeAbbrevOp &getOperandInfo(unsigned N) const {
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176 return OperandList[N];
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177 }
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178
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179 void Add(const BitCodeAbbrevOp &OpInfo) {
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180 OperandList.push_back(OpInfo);
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181 }
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182 };
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183 } // End llvm namespace
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184
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185 #endif