Mercurial > hg
annotate mercurial/pure/parsers.py @ 47143:47ffc754989a
revlog: always "append" full size tuple
Same reasoning as the previous patch.
Differential Revision: https://phab.mercurial-scm.org/D10569
author | Pierre-Yves David <pierre-yves.david@octobus.net> |
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date | Mon, 03 May 2021 12:21:25 +0200 |
parents | 4292bed8da7c |
children | 6b1eae313b2f |
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1 # parsers.py - Python implementation of parsers.c |
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2 # |
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3 # Copyright 2009 Olivia Mackall <olivia@selenic.com> and others |
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4 # |
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5 # This software may be used and distributed according to the terms of the |
10263 | 6 # GNU General Public License version 2 or any later version. |
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7 |
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8 from __future__ import absolute_import |
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9 |
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10 import struct |
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11 import zlib |
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12 |
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13 from ..node import ( |
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14 nullrev, |
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15 sha1nodeconstants, |
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16 ) |
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17 from .. import ( |
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18 pycompat, |
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19 util, |
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20 ) |
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21 |
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22 from ..revlogutils import nodemap as nodemaputil |
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23 from ..revlogutils import constants as revlog_constants |
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24 |
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25 stringio = pycompat.bytesio |
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26 |
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27 |
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28 _pack = struct.pack |
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29 _unpack = struct.unpack |
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30 _compress = zlib.compress |
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31 _decompress = zlib.decompress |
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32 |
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33 # Some code below makes tuples directly because it's more convenient. However, |
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34 # code outside this module should always use dirstatetuple. |
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35 def dirstatetuple(*x): |
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36 # x is a tuple |
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37 return x |
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38 |
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39 |
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40 def gettype(q): |
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41 return int(q & 0xFFFF) |
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42 |
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43 |
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44 def offset_type(offset, type): |
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45 return int(int(offset) << 16 | type) |
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46 |
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47 |
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48 class BaseIndexObject(object): |
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49 # Format of an index entry according to Python's `struct` language |
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50 index_format = revlog_constants.INDEX_ENTRY_V1 |
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51 # Size of a C unsigned long long int, platform independent |
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52 big_int_size = struct.calcsize(b'>Q') |
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53 # Size of a C long int, platform independent |
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54 int_size = struct.calcsize(b'>i') |
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55 # An empty index entry, used as a default value to be overridden, or nullrev |
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56 null_item = (0, 0, 0, -1, -1, -1, -1, sha1nodeconstants.nullid, 0, 0) |
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57 |
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58 @util.propertycache |
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59 def entry_size(self): |
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60 return self.index_format.size |
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61 |
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62 @property |
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63 def nodemap(self): |
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64 msg = b"index.nodemap is deprecated, use index.[has_node|rev|get_rev]" |
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65 util.nouideprecwarn(msg, b'5.3', stacklevel=2) |
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66 return self._nodemap |
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67 |
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68 @util.propertycache |
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69 def _nodemap(self): |
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70 nodemap = nodemaputil.NodeMap({sha1nodeconstants.nullid: nullrev}) |
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71 for r in range(0, len(self)): |
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72 n = self[r][7] |
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73 nodemap[n] = r |
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74 return nodemap |
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75 |
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76 def has_node(self, node): |
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77 """return True if the node exist in the index""" |
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78 return node in self._nodemap |
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79 |
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80 def rev(self, node): |
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81 """return a revision for a node |
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82 |
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83 If the node is unknown, raise a RevlogError""" |
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84 return self._nodemap[node] |
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85 |
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86 def get_rev(self, node): |
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87 """return a revision for a node |
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88 |
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89 If the node is unknown, return None""" |
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90 return self._nodemap.get(node) |
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91 |
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92 def _stripnodes(self, start): |
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93 if '_nodemap' in vars(self): |
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94 for r in range(start, len(self)): |
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95 n = self[r][7] |
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96 del self._nodemap[n] |
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97 |
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98 def clearcaches(self): |
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99 self.__dict__.pop('_nodemap', None) |
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100 |
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101 def __len__(self): |
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102 return self._lgt + len(self._extra) |
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103 |
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104 def append(self, tup): |
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105 if '_nodemap' in vars(self): |
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106 self._nodemap[tup[7]] = len(self) |
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107 data = self._pack_entry(tup) |
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108 self._extra.append(data) |
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109 |
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110 def _pack_entry(self, entry): |
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111 assert entry[8] == 0 |
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112 assert entry[9] == 0 |
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113 return self.index_format.pack(*entry[:8]) |
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114 |
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115 def _check_index(self, i): |
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116 if not isinstance(i, int): |
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117 raise TypeError(b"expecting int indexes") |
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118 if i < 0 or i >= len(self): |
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119 raise IndexError |
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120 |
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121 def __getitem__(self, i): |
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122 if i == -1: |
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123 return self.null_item |
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124 self._check_index(i) |
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125 if i >= self._lgt: |
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126 data = self._extra[i - self._lgt] |
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127 else: |
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128 index = self._calculate_index(i) |
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129 data = self._data[index : index + self.entry_size] |
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130 r = self._unpack_entry(data) |
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131 if self._lgt and i == 0: |
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132 r = (offset_type(0, gettype(r[0])),) + r[1:] |
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133 return r |
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134 |
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135 def _unpack_entry(self, data): |
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136 r = self.index_format.unpack(data) |
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137 r = r + (0, 0) |
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138 return r |
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139 |
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140 def pack_header(self, header): |
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141 """pack header information as binary""" |
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142 v_fmt = revlog_constants.INDEX_HEADER |
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143 return v_fmt.pack(header) |
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144 |
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145 def entry_binary(self, rev): |
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146 """return the raw binary string representing a revision""" |
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147 entry = self[rev] |
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148 p = revlog_constants.INDEX_ENTRY_V1.pack(*entry[:8]) |
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149 if rev == 0: |
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150 p = p[revlog_constants.INDEX_HEADER.size :] |
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151 return p |
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152 |
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153 |
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154 class IndexObject(BaseIndexObject): |
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155 def __init__(self, data): |
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156 assert len(data) % self.entry_size == 0, ( |
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157 len(data), |
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158 self.entry_size, |
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159 len(data) % self.entry_size, |
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160 ) |
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161 self._data = data |
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162 self._lgt = len(data) // self.entry_size |
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163 self._extra = [] |
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164 |
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165 def _calculate_index(self, i): |
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166 return i * self.entry_size |
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168 def __delitem__(self, i): |
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169 if not isinstance(i, slice) or not i.stop == -1 or i.step is not None: |
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170 raise ValueError(b"deleting slices only supports a:-1 with step 1") |
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171 i = i.start |
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172 self._check_index(i) |
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173 self._stripnodes(i) |
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174 if i < self._lgt: |
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175 self._data = self._data[: i * self.entry_size] |
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176 self._lgt = i |
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177 self._extra = [] |
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178 else: |
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179 self._extra = self._extra[: i - self._lgt] |
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180 |
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181 |
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182 class PersistentNodeMapIndexObject(IndexObject): |
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183 """a Debug oriented class to test persistent nodemap |
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184 |
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185 We need a simple python object to test API and higher level behavior. See |
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186 the Rust implementation for more serious usage. This should be used only |
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187 through the dedicated `devel.persistent-nodemap` config. |
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188 """ |
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189 |
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190 def nodemap_data_all(self): |
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191 """Return bytes containing a full serialization of a nodemap |
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192 |
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193 The nodemap should be valid for the full set of revisions in the |
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194 index.""" |
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195 return nodemaputil.persistent_data(self) |
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196 |
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197 def nodemap_data_incremental(self): |
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198 """Return bytes containing a incremental update to persistent nodemap |
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199 |
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200 This containst the data for an append-only update of the data provided |
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201 in the last call to `update_nodemap_data`. |
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202 """ |
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203 if self._nm_root is None: |
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204 return None |
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205 docket = self._nm_docket |
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206 changed, data = nodemaputil.update_persistent_data( |
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207 self, self._nm_root, self._nm_max_idx, self._nm_docket.tip_rev |
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208 ) |
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209 |
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210 self._nm_root = self._nm_max_idx = self._nm_docket = None |
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211 return docket, changed, data |
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212 |
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213 def update_nodemap_data(self, docket, nm_data): |
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214 """provide full block of persisted binary data for a nodemap |
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215 |
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216 The data are expected to come from disk. See `nodemap_data_all` for a |
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217 produceur of such data.""" |
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218 if nm_data is not None: |
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219 self._nm_root, self._nm_max_idx = nodemaputil.parse_data(nm_data) |
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220 if self._nm_root: |
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221 self._nm_docket = docket |
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222 else: |
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223 self._nm_root = self._nm_max_idx = self._nm_docket = None |
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224 |
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225 |
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226 class InlinedIndexObject(BaseIndexObject): |
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227 def __init__(self, data, inline=0): |
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228 self._data = data |
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229 self._lgt = self._inline_scan(None) |
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230 self._inline_scan(self._lgt) |
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231 self._extra = [] |
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232 |
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233 def _inline_scan(self, lgt): |
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234 off = 0 |
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235 if lgt is not None: |
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236 self._offsets = [0] * lgt |
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237 count = 0 |
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238 while off <= len(self._data) - self.entry_size: |
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239 start = off + self.big_int_size |
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240 (s,) = struct.unpack( |
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241 b'>i', |
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242 self._data[start : start + self.int_size], |
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243 ) |
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244 if lgt is not None: |
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245 self._offsets[count] = off |
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246 count += 1 |
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247 off += self.entry_size + s |
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248 if off != len(self._data): |
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249 raise ValueError(b"corrupted data") |
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250 return count |
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251 |
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252 def __delitem__(self, i): |
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253 if not isinstance(i, slice) or not i.stop == -1 or i.step is not None: |
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254 raise ValueError(b"deleting slices only supports a:-1 with step 1") |
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255 i = i.start |
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256 self._check_index(i) |
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257 self._stripnodes(i) |
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258 if i < self._lgt: |
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259 self._offsets = self._offsets[:i] |
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260 self._lgt = i |
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261 self._extra = [] |
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262 else: |
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263 self._extra = self._extra[: i - self._lgt] |
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264 |
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265 def _calculate_index(self, i): |
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266 return self._offsets[i] |
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267 |
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268 |
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269 def parse_index2(data, inline, revlogv2=False): |
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270 if not inline: |
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271 cls = IndexObject2 if revlogv2 else IndexObject |
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272 return cls(data), None |
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273 cls = InlinedIndexObject2 if revlogv2 else InlinedIndexObject |
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274 return cls(data, inline), (0, data) |
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275 |
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276 |
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277 class Index2Mixin(object): |
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278 index_format = revlog_constants.INDEX_ENTRY_V2 |
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279 |
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280 def replace_sidedata_info( |
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281 self, i, sidedata_offset, sidedata_length, offset_flags |
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282 ): |
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283 """ |
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284 Replace an existing index entry's sidedata offset and length with new |
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285 ones. |
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286 This cannot be used outside of the context of sidedata rewriting, |
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287 inside the transaction that creates the revision `i`. |
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288 """ |
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289 if i < 0: |
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290 raise KeyError |
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291 self._check_index(i) |
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292 sidedata_format = b">Qi" |
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293 packed_size = struct.calcsize(sidedata_format) |
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294 if i >= self._lgt: |
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295 packed = _pack(sidedata_format, sidedata_offset, sidedata_length) |
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296 old = self._extra[i - self._lgt] |
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297 offset_flags = struct.pack(b">Q", offset_flags) |
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298 new = offset_flags + old[8:64] + packed + old[64 + packed_size :] |
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299 self._extra[i - self._lgt] = new |
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300 else: |
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301 msg = b"cannot rewrite entries outside of this transaction" |
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302 raise KeyError(msg) |
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303 |
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304 def _unpack_entry(self, data): |
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305 return self.index_format.unpack(data) |
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306 |
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307 def _pack_entry(self, entry): |
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308 return self.index_format.pack(*entry) |
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309 |
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310 def entry_binary(self, rev): |
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311 """return the raw binary string representing a revision""" |
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312 entry = self[rev] |
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313 p = revlog_constants.INDEX_ENTRY_V2.pack(*entry) |
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314 if rev == 0: |
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315 p = p[revlog_constants.INDEX_HEADER.size :] |
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316 return p |
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317 |
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318 |
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319 class IndexObject2(Index2Mixin, IndexObject): |
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320 pass |
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321 |
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322 |
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323 class InlinedIndexObject2(Index2Mixin, InlinedIndexObject): |
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324 def _inline_scan(self, lgt): |
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325 sidedata_length_pos = 72 |
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326 off = 0 |
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327 if lgt is not None: |
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328 self._offsets = [0] * lgt |
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329 count = 0 |
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330 while off <= len(self._data) - self.entry_size: |
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331 start = off + self.big_int_size |
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332 (data_size,) = struct.unpack( |
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333 b'>i', |
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334 self._data[start : start + self.int_size], |
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335 ) |
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336 start = off + sidedata_length_pos |
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337 (side_data_size,) = struct.unpack( |
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338 b'>i', self._data[start : start + self.int_size] |
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339 ) |
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340 if lgt is not None: |
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341 self._offsets[count] = off |
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342 count += 1 |
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343 off += self.entry_size + data_size + side_data_size |
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344 if off != len(self._data): |
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345 raise ValueError(b"corrupted data") |
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346 return count |
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347 |
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348 |
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349 def parse_index_devel_nodemap(data, inline): |
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350 """like parse_index2, but alway return a PersistentNodeMapIndexObject""" |
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351 return PersistentNodeMapIndexObject(data), None |
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352 |
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353 |
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354 def parse_dirstate(dmap, copymap, st): |
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355 parents = [st[:20], st[20:40]] |
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356 # dereference fields so they will be local in loop |
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357 format = b">cllll" |
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358 e_size = struct.calcsize(format) |
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359 pos1 = 40 |
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360 l = len(st) |
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361 |
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362 # the inner loop |
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363 while pos1 < l: |
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364 pos2 = pos1 + e_size |
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365 e = _unpack(b">cllll", st[pos1:pos2]) # a literal here is faster |
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366 pos1 = pos2 + e[4] |
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367 f = st[pos2:pos1] |
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368 if b'\0' in f: |
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369 f, c = f.split(b'\0') |
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370 copymap[f] = c |
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371 dmap[f] = e[:4] |
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372 return parents |
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373 |
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374 |
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375 def pack_dirstate(dmap, copymap, pl, now): |
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376 now = int(now) |
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377 cs = stringio() |
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378 write = cs.write |
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379 write(b"".join(pl)) |
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380 for f, e in pycompat.iteritems(dmap): |
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381 if e[0] == b'n' and e[3] == now: |
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382 # The file was last modified "simultaneously" with the current |
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383 # write to dirstate (i.e. within the same second for file- |
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384 # systems with a granularity of 1 sec). This commonly happens |
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385 # for at least a couple of files on 'update'. |
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386 # The user could change the file without changing its size |
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387 # within the same second. Invalidate the file's mtime in |
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388 # dirstate, forcing future 'status' calls to compare the |
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389 # contents of the file if the size is the same. This prevents |
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390 # mistakenly treating such files as clean. |
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391 e = dirstatetuple(e[0], e[1], e[2], -1) |
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392 dmap[f] = e |
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393 |
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394 if f in copymap: |
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395 f = b"%s\0%s" % (f, copymap[f]) |
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396 e = _pack(b">cllll", e[0], e[1], e[2], e[3], len(f)) |
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397 write(e) |
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398 write(f) |
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399 return cs.getvalue() |