Mercurial > hg
annotate mercurial/linelog.py @ 43588:a825ba8eb0a1 stable
relnotes: copy "next" to "5.2" and clear "next"
This is the same thing as we did for 5.1 in cba59b338976 (relnotes:
copy "next" to "5.1" and clear "next", 2019-08-01).
Differential Revision: https://phab.mercurial-scm.org/D7231
author | Martin von Zweigbergk <martinvonz@google.com> |
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date | Tue, 05 Nov 2019 13:31:40 -0800 |
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children | acc4047c2194 |
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1 # linelog - efficient cache for annotate data |
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2 # |
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3 # Copyright 2018 Google LLC. |
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4 # |
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5 # This software may be used and distributed according to the terms of the |
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6 # GNU General Public License version 2 or any later version. |
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7 """linelog is an efficient cache for annotate data inspired by SCCS Weaves. |
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8 |
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9 SCCS Weaves are an implementation of |
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10 https://en.wikipedia.org/wiki/Interleaved_deltas. See |
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11 mercurial/help/internals/linelog.txt for an exploration of SCCS weaves |
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12 and how linelog works in detail. |
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13 |
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14 Here's a hacker's summary: a linelog is a program which is executed in |
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15 the context of a revision. Executing the program emits information |
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16 about lines, including the revision that introduced them and the line |
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17 number in the file at the introducing revision. When an insertion or |
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18 deletion is performed on the file, a jump instruction is used to patch |
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19 in a new body of annotate information. |
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20 """ |
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21 from __future__ import absolute_import, print_function |
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22 |
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23 import abc |
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24 import struct |
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25 |
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26 from .thirdparty import attr |
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27 from . import pycompat |
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28 |
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29 _llentry = struct.Struct(b'>II') |
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30 |
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31 |
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32 class LineLogError(Exception): |
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33 """Error raised when something bad happens internally in linelog.""" |
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34 |
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35 |
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36 @attr.s |
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37 class lineinfo(object): |
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38 # Introducing revision of this line. |
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39 rev = attr.ib() |
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40 # Line number for this line in its introducing revision. |
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41 linenum = attr.ib() |
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42 # Private. Offset in the linelog program of this line. Used internally. |
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43 _offset = attr.ib() |
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44 |
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45 |
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46 @attr.s |
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47 class annotateresult(object): |
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48 rev = attr.ib() |
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49 lines = attr.ib() |
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50 _eof = attr.ib() |
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51 |
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52 def __iter__(self): |
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53 return iter(self.lines) |
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54 |
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55 |
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56 class _llinstruction(object): |
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57 |
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58 __metaclass__ = abc.ABCMeta |
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59 |
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60 @abc.abstractmethod |
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61 def __init__(self, op1, op2): |
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62 pass |
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63 |
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64 @abc.abstractmethod |
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65 def __str__(self): |
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66 pass |
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67 |
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68 def __repr__(self): |
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69 return str(self) |
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70 |
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71 @abc.abstractmethod |
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72 def __eq__(self, other): |
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73 pass |
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74 |
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75 @abc.abstractmethod |
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76 def encode(self): |
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77 """Encode this instruction to the binary linelog format.""" |
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78 |
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79 @abc.abstractmethod |
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80 def execute(self, rev, pc, emit): |
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81 """Execute this instruction. |
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82 |
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83 Args: |
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84 rev: The revision we're annotating. |
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85 pc: The current offset in the linelog program. |
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86 emit: A function that accepts a single lineinfo object. |
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87 |
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88 Returns: |
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89 The new value of pc. Returns None if exeuction should stop |
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90 (that is, we've found the end of the file.) |
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91 """ |
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92 |
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93 |
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94 class _jge(_llinstruction): |
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95 """If the current rev is greater than or equal to op1, jump to op2.""" |
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96 |
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97 def __init__(self, op1, op2): |
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98 self._cmprev = op1 |
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99 self._target = op2 |
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100 |
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101 def __str__(self): |
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102 return r'JGE %d %d' % (self._cmprev, self._target) |
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103 |
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104 def __eq__(self, other): |
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105 return ( |
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106 type(self) == type(other) |
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107 and self._cmprev == other._cmprev |
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108 and self._target == other._target |
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109 ) |
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110 |
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111 def encode(self): |
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112 return _llentry.pack(self._cmprev << 2, self._target) |
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113 |
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114 def execute(self, rev, pc, emit): |
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115 if rev >= self._cmprev: |
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116 return self._target |
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117 return pc + 1 |
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118 |
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119 |
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120 class _jump(_llinstruction): |
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121 """Unconditional jumps are expressed as a JGE with op1 set to 0.""" |
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122 |
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123 def __init__(self, op1, op2): |
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124 if op1 != 0: |
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125 raise LineLogError(b"malformed JUMP, op1 must be 0, got %d" % op1) |
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126 self._target = op2 |
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127 |
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128 def __str__(self): |
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129 return r'JUMP %d' % (self._target) |
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130 |
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131 def __eq__(self, other): |
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132 return type(self) == type(other) and self._target == other._target |
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133 |
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134 def encode(self): |
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135 return _llentry.pack(0, self._target) |
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136 |
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137 def execute(self, rev, pc, emit): |
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138 return self._target |
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139 |
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140 |
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141 class _eof(_llinstruction): |
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142 """EOF is expressed as a JGE that always jumps to 0.""" |
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143 |
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144 def __init__(self, op1, op2): |
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145 if op1 != 0: |
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146 raise LineLogError(b"malformed EOF, op1 must be 0, got %d" % op1) |
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147 if op2 != 0: |
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148 raise LineLogError(b"malformed EOF, op2 must be 0, got %d" % op2) |
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149 |
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150 def __str__(self): |
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151 return r'EOF' |
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152 |
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153 def __eq__(self, other): |
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154 return type(self) == type(other) |
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155 |
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156 def encode(self): |
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157 return _llentry.pack(0, 0) |
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158 |
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159 def execute(self, rev, pc, emit): |
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160 return None |
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161 |
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162 |
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163 class _jl(_llinstruction): |
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164 """If the current rev is less than op1, jump to op2.""" |
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165 |
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166 def __init__(self, op1, op2): |
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167 self._cmprev = op1 |
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168 self._target = op2 |
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169 |
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170 def __str__(self): |
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171 return r'JL %d %d' % (self._cmprev, self._target) |
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172 |
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173 def __eq__(self, other): |
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174 return ( |
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175 type(self) == type(other) |
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176 and self._cmprev == other._cmprev |
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177 and self._target == other._target |
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178 ) |
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179 |
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180 def encode(self): |
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181 return _llentry.pack(1 | (self._cmprev << 2), self._target) |
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182 |
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183 def execute(self, rev, pc, emit): |
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184 if rev < self._cmprev: |
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185 return self._target |
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186 return pc + 1 |
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187 |
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188 |
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189 class _line(_llinstruction): |
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190 """Emit a line.""" |
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191 |
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192 def __init__(self, op1, op2): |
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193 # This line was introduced by this revision number. |
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194 self._rev = op1 |
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195 # This line had the specified line number in the introducing revision. |
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196 self._origlineno = op2 |
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197 |
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198 def __str__(self): |
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199 return r'LINE %d %d' % (self._rev, self._origlineno) |
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200 |
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201 def __eq__(self, other): |
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202 return ( |
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203 type(self) == type(other) |
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204 and self._rev == other._rev |
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205 and self._origlineno == other._origlineno |
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206 ) |
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207 |
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208 def encode(self): |
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209 return _llentry.pack(2 | (self._rev << 2), self._origlineno) |
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210 |
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211 def execute(self, rev, pc, emit): |
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212 emit(lineinfo(self._rev, self._origlineno, pc)) |
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213 return pc + 1 |
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214 |
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215 |
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216 def _decodeone(data, offset): |
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217 """Decode a single linelog instruction from an offset in a buffer.""" |
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218 try: |
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219 op1, op2 = _llentry.unpack_from(data, offset) |
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220 except struct.error as e: |
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221 raise LineLogError(b'reading an instruction failed: %r' % e) |
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222 opcode = op1 & 0b11 |
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223 op1 = op1 >> 2 |
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224 if opcode == 0: |
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225 if op1 == 0: |
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226 if op2 == 0: |
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227 return _eof(op1, op2) |
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228 return _jump(op1, op2) |
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229 return _jge(op1, op2) |
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230 elif opcode == 1: |
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231 return _jl(op1, op2) |
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232 elif opcode == 2: |
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233 return _line(op1, op2) |
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234 raise NotImplementedError(b'Unimplemented opcode %r' % opcode) |
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235 |
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236 |
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237 class linelog(object): |
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238 """Efficient cache for per-line history information.""" |
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239 |
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240 def __init__(self, program=None, maxrev=0): |
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241 if program is None: |
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242 # We pad the program with an extra leading EOF so that our |
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243 # offsets will match the C code exactly. This means we can |
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244 # interoperate with the C code. |
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245 program = [_eof(0, 0), _eof(0, 0)] |
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246 self._program = program |
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247 self._lastannotate = None |
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248 self._maxrev = maxrev |
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249 |
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250 def __eq__(self, other): |
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251 return ( |
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252 type(self) == type(other) |
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253 and self._program == other._program |
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254 and self._maxrev == other._maxrev |
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255 ) |
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256 |
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257 def __repr__(self): |
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258 return b'<linelog at %s: maxrev=%d size=%d>' % ( |
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259 hex(id(self)), |
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260 self._maxrev, |
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261 len(self._program), |
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262 ) |
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263 |
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264 def debugstr(self): |
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265 fmt = r'%%%dd %%s' % len(str(len(self._program))) |
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266 return pycompat.sysstr(b'\n').join( |
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267 fmt % (idx, i) for idx, i in enumerate(self._program[1:], 1) |
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268 ) |
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269 |
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270 @classmethod |
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271 def fromdata(cls, buf): |
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272 if len(buf) % _llentry.size != 0: |
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273 raise LineLogError( |
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274 b"invalid linelog buffer size %d (must be a multiple of %d)" |
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275 % (len(buf), _llentry.size) |
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276 ) |
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277 expected = len(buf) / _llentry.size |
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278 fakejge = _decodeone(buf, 0) |
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279 if isinstance(fakejge, _jump): |
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280 maxrev = 0 |
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281 else: |
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282 maxrev = fakejge._cmprev |
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283 numentries = fakejge._target |
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284 if expected != numentries: |
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285 raise LineLogError( |
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286 b"corrupt linelog data: claimed" |
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287 b" %d entries but given data for %d entries" |
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288 % (expected, numentries) |
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289 ) |
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290 instructions = [_eof(0, 0)] |
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291 for offset in pycompat.xrange(1, numentries): |
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292 instructions.append(_decodeone(buf, offset * _llentry.size)) |
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293 return cls(instructions, maxrev=maxrev) |
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294 |
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295 def encode(self): |
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296 hdr = _jge(self._maxrev, len(self._program)).encode() |
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297 return hdr + b''.join(i.encode() for i in self._program[1:]) |
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298 |
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299 def clear(self): |
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300 self._program = [] |
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301 self._maxrev = 0 |
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302 self._lastannotate = None |
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303 |
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304 def replacelines_vec(self, rev, a1, a2, blines): |
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305 return self.replacelines( |
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306 rev, a1, a2, 0, len(blines), _internal_blines=blines |
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307 ) |
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308 |
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309 def replacelines(self, rev, a1, a2, b1, b2, _internal_blines=None): |
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310 """Replace lines [a1, a2) with lines [b1, b2).""" |
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311 if self._lastannotate: |
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312 # TODO(augie): make replacelines() accept a revision at |
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313 # which we're editing as well as a revision to mark |
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314 # responsible for the edits. In hg-experimental it's |
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315 # stateful like this, so we're doing the same thing to |
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316 # retain compatibility with absorb until that's imported. |
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317 ar = self._lastannotate |
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318 else: |
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319 ar = self.annotate(rev) |
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320 # ar = self.annotate(self._maxrev) |
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321 if a1 > len(ar.lines): |
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322 raise LineLogError( |
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323 b'%d contains %d lines, tried to access line %d' |
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324 % (rev, len(ar.lines), a1) |
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325 ) |
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326 elif a1 == len(ar.lines): |
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327 # Simulated EOF instruction since we're at EOF, which |
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328 # doesn't have a "real" line. |
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329 a1inst = _eof(0, 0) |
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330 a1info = lineinfo(0, 0, ar._eof) |
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331 else: |
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332 a1info = ar.lines[a1] |
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333 a1inst = self._program[a1info._offset] |
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334 programlen = self._program.__len__ |
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335 oldproglen = programlen() |
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336 appendinst = self._program.append |
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337 |
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338 # insert |
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340 bappend = blineinfos.append | |
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341 if b1 < b2: |
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342 # Determine the jump target for the JGE at the start of |
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343 # the new block. |
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344 tgt = oldproglen + (b2 - b1 + 1) |
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345 # Jump to skip the insert if we're at an older revision. |
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346 appendinst(_jl(rev, tgt)) |
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347 for linenum in pycompat.xrange(b1, b2): |
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348 if _internal_blines is None: |
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350 appendinst(_line(rev, linenum)) |
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351 else: |
38971 | 352 newrev, newlinenum = _internal_blines[linenum] |
353 bappend(lineinfo(newrev, newlinenum, programlen())) | |
354 appendinst(_line(newrev, newlinenum)) | |
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355 # delete |
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356 if a1 < a2: |
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357 if a2 > len(ar.lines): |
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358 raise LineLogError( |
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359 b'%d contains %d lines, tried to access line %d' |
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360 % (rev, len(ar.lines), a2) |
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361 ) |
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362 elif a2 == len(ar.lines): |
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363 endaddr = ar._eof |
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364 else: |
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365 endaddr = ar.lines[a2]._offset |
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366 if a2 > 0 and rev < self._maxrev: |
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367 # If we're here, we're deleting a chunk of an old |
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368 # commit, so we need to be careful and not touch |
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369 # invisible lines between a2-1 and a2 (IOW, lines that |
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370 # are added later). |
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371 endaddr = ar.lines[a2 - 1]._offset + 1 |
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372 appendinst(_jge(rev, endaddr)) |
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373 # copy instruction from a1 |
38971 | 374 a1instpc = programlen() |
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375 appendinst(a1inst) |
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376 # if a1inst isn't a jump or EOF, then we need to add an unconditional |
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377 # jump back into the program here. |
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378 if not isinstance(a1inst, (_jump, _eof)): |
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379 appendinst(_jump(0, a1info._offset + 1)) |
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380 # Patch instruction at a1, which makes our patch live. |
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381 self._program[a1info._offset] = _jump(0, oldproglen) |
38971 | 382 |
383 # Update self._lastannotate in place. This serves as a cache to avoid | |
384 # expensive "self.annotate" in this function, when "replacelines" is | |
385 # used continuously. | |
386 if len(self._lastannotate.lines) > a1: | |
387 self._lastannotate.lines[a1]._offset = a1instpc | |
388 else: | |
389 assert isinstance(a1inst, _eof) | |
390 self._lastannotate._eof = a1instpc | |
391 self._lastannotate.lines[a1:a2] = blineinfos | |
392 self._lastannotate.rev = max(self._lastannotate.rev, rev) | |
393 | |
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394 if rev > self._maxrev: |
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395 self._maxrev = rev |
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396 |
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397 def annotate(self, rev): |
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398 pc = 1 |
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399 lines = [] |
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400 executed = 0 |
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401 # Sanity check: if instructions executed exceeds len(program), we |
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402 # hit an infinite loop in the linelog program somehow and we |
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403 # should stop. |
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404 while pc is not None and executed < len(self._program): |
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405 inst = self._program[pc] |
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406 lastpc = pc |
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407 pc = inst.execute(rev, pc, lines.append) |
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408 executed += 1 |
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409 if pc is not None: |
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410 raise LineLogError( |
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411 r'Probably hit an infinite loop in linelog. Program:\n' |
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412 + self.debugstr() |
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413 ) |
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414 ar = annotateresult(rev, lines, lastpc) |
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415 self._lastannotate = ar |
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416 return ar |
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417 |
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418 @property |
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419 def maxrev(self): |
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420 return self._maxrev |
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421 |
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422 # Stateful methods which depend on the value of the last |
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423 # annotation run. This API is for compatiblity with the original |
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424 # linelog, and we should probably consider refactoring it. |
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425 @property |
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426 def annotateresult(self): |
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427 """Return the last annotation result. C linelog code exposed this.""" |
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428 return [(l.rev, l.linenum) for l in self._lastannotate.lines] |
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429 |
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430 def getoffset(self, line): |
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431 return self._lastannotate.lines[line]._offset |
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432 |
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433 def getalllines(self, start=0, end=0): |
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434 """Get all lines that ever occurred in [start, end). |
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435 |
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436 Passing start == end == 0 means "all lines ever". |
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437 |
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438 This works in terms of *internal* program offsets, not line numbers. |
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439 """ |
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440 pc = start or 1 |
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441 lines = [] |
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442 # only take as many steps as there are instructions in the |
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443 # program - if we don't find an EOF or our stop-line before |
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444 # then, something is badly broken. |
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445 for step in pycompat.xrange(len(self._program)): |
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446 inst = self._program[pc] |
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447 nextpc = pc + 1 |
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448 if isinstance(inst, _jump): |
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449 nextpc = inst._target |
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450 elif isinstance(inst, _eof): |
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451 return lines |
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452 elif isinstance(inst, (_jl, _jge)): |
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453 pass |
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454 elif isinstance(inst, _line): |
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455 lines.append((inst._rev, inst._origlineno)) |
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456 else: |
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457 raise LineLogError(b"Illegal instruction %r" % inst) |
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458 if nextpc == end: |
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459 return lines |
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460 pc = nextpc |
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461 raise LineLogError(b"Failed to perform getalllines") |