2 # ex:ts=4:sw=4:sts=4:et
3 # -*- tab-width: 4; c-basic-offset: 4; indent-tabs-mode: nil -*-
5 BitBake 'Event' implementation
7 Caching of bitbake variables before task execution
9 # Copyright (C) 2006 Richard Purdie
11 # but small sections based on code from bin/bitbake:
12 # Copyright (C) 2003, 2004 Chris Larson
13 # Copyright (C) 2003, 2004 Phil Blundell
14 # Copyright (C) 2003 - 2005 Michael 'Mickey' Lauer
15 # Copyright (C) 2005 Holger Hans Peter Freyther
16 # Copyright (C) 2005 ROAD GmbH
18 This program is free software; you can redistribute it and/or modify it under
19 the terms of the GNU General Public License as published by the Free Software
20 Foundation; either version 2 of the License, or (at your option) any later
23 This program is distributed in the hope that it will be useful, but WITHOUT
24 ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS
25 FOR A PARTICULAR PURPOSE. See the GNU General Public License for more details.
27 You should have received a copy of the GNU General Public License along with
28 this program; if not, write to the Free Software Foundation, Inc., 59 Temple
29 Place, Suite 330, Boston, MA 02111-1307 USA.
38 import cPickle as pickle
41 print "NOTE: Importing cPickle failed. Falling back to a very slow implementation."
43 __cache_version__ = "125"
47 BitBake Cache implementation
49 def __init__(self, cooker):
52 self.cachedir = bb.data.getVar("CACHE", cooker.configuration.data, True)
54 self.depends_cache = {}
58 if self.cachedir in [None, '']:
59 self.has_cache = False
60 if cooker.cb is not None:
61 print "NOTE: Not using a cache. Set CACHE = <directory> to enable."
64 self.cachefile = os.path.join(self.cachedir,"bb_cache.dat")
66 if cooker.cb is not None:
67 print "NOTE: Using cache in '%s'" % self.cachedir
69 os.stat( self.cachedir )
71 bb.mkdirhier( self.cachedir )
73 if self.has_cache and (self.mtime(self.cachefile)):
75 p = pickle.Unpickler( file(self.cachefile,"rb"))
76 self.depends_cache, version_data = p.load()
77 if version_data['CACHE_VER'] != __cache_version__:
78 raise ValueError, 'Cache Version Mismatch'
79 if version_data['BITBAKE_VER'] != bb.__version__:
80 raise ValueError, 'Bitbake Version Mismatch'
81 except (ValueError, KeyError):
82 bb.note("Invalid cache found, rebuilding...")
83 self.depends_cache = {}
85 if self.depends_cache:
86 for fn in self.depends_cache.keys():
88 self.cacheValidUpdate(fn)
90 def getVar(self, var, fn, exp = 0):
92 Gets the value of a variable
93 (similar to getVar in the data class)
95 There are two scenarios:
96 1. We have cached data - serve from depends_cache[fn]
97 2. We're learning what data to cache - serve from data
98 backend but add a copy of the data to the cache.
102 return self.depends_cache[fn][var]
104 if not fn in self.depends_cache:
105 self.depends_cache[fn] = {}
107 if fn != self.data_fn:
108 # We're trying to access data in the cache which doesn't exist
109 # yet setData hasn't been called to setup the right access. Very bad.
110 bb.error("Parsing error data_fn %s and fn %s don't match" % (self.data_fn, fn))
112 result = bb.data.getVar(var, self.data, exp)
113 self.depends_cache[fn][var] = result
116 def setData(self, fn, data):
118 Called to prime bb_cache ready to learn which variables to cache.
119 Will be followed by calls to self.getVar which aren't cached
120 but can be fulfilled from self.data.
125 # Make sure __depends makes the depends_cache
126 self.getVar("__depends", fn, True)
127 self.depends_cache[fn]["CACHETIMESTAMP"] = bb.parse.cached_mtime(fn)
129 def loadDataFull(self, fn, cooker):
131 Return a complete set of data for fn.
132 To do this, we need to parse the file.
134 bb_data, skipped = self.load_bbfile(fn, cooker.configuration.data)
137 def loadData(self, fn, cooker):
139 Load a subset of data for fn.
140 If the cached data is valid we do nothing,
141 To do this, we need to parse the file and set the system
142 to record the variables accessed.
143 Return the cache status and whether the file was skipped when parsed
145 if self.cacheValid(fn):
146 if "SKIPPED" in self.depends_cache[fn]:
150 bb_data, skipped = self.load_bbfile(fn, cooker.configuration.data)
151 self.setData(fn, bb_data)
152 return False, skipped
154 def cacheValid(self, fn):
156 Is the cache valid for fn?
157 Fast version, no timestamps checked.
160 if not self.has_cache:
166 def cacheValidUpdate(self, fn):
168 Is the cache valid for fn?
169 Make thorough (slower) checks including timestamps.
172 if not self.has_cache:
175 # Check file still exists
176 if self.mtime(fn) == 0:
177 bb.debug(2, "Cache: %s not longer exists" % fn)
181 # File isn't in depends_cache
182 if not fn in self.depends_cache:
183 bb.debug(2, "Cache: %s is not cached" % fn)
187 # Check the file's timestamp
188 if bb.parse.cached_mtime(fn) > self.getVar("CACHETIMESTAMP", fn, True):
189 bb.debug(2, "Cache: %s changed" % fn)
193 # Check dependencies are still valid
194 depends = self.getVar("__depends", fn, True)
195 for f,old_mtime in depends:
196 new_mtime = bb.parse.cached_mtime(f)
197 if (new_mtime > old_mtime):
198 bb.debug(2, "Cache: %s's dependency %s changed" % (fn, f))
202 bb.debug(2, "Depends Cache: %s is clean" % fn)
203 if not fn in self.clean:
211 Called from the parser
213 if not fn in self.depends_cache:
214 self.depends_cache[fn] = {}
215 self.depends_cache[fn]["SKIPPED"] = "1"
217 def remove(self, fn):
219 Remove a fn from the cache
220 Called from the parser in error cases
222 bb.debug(1, "Removing %s from cache" % fn)
223 if fn in self.depends_cache:
224 del self.depends_cache[fn]
231 Called from the parser when complete (or exitting)
234 if not self.has_cache:
238 version_data['CACHE_VER'] = __cache_version__
239 version_data['BITBAKE_VER'] = bb.__version__
241 p = pickle.Pickler(file(self.cachefile, "wb" ), -1 )
242 p.dump([self.depends_cache, version_data])
244 def mtime(self, cachefile):
246 return os.stat(cachefile)[8]
250 def load_bbfile( self, bbfile , config):
252 Load and parse one .bb build file
253 Return the data and whether parsing resulted in the file being skipped
257 from bb import utils, data, parse, debug, event, fatal
259 # expand tmpdir to include this topdir
260 data.setVar('TMPDIR', data.getVar('TMPDIR', config, 1) or "", config)
261 bbfile_loc = os.path.abspath(os.path.dirname(bbfile))
262 oldpath = os.path.abspath(os.getcwd())
263 if self.mtime(bbfile_loc):
265 bb_data = data.init_db(config)
267 bb_data = parse.handle(bbfile, bb_data) # read .bb data
269 return bb_data, False
270 except bb.parse.SkipPackage:
279 The Objective: Cache the minimum amount of data possible yet get to the
280 stage of building packages (i.e. tryBuild) without reparsing any .bb files.
282 To do this, we intercept getVar calls and only cache the variables we see
283 being accessed. We rely on the cache getVar calls being made for all
284 variables bitbake might need to use to reach this stage. For each cached
285 file we need to track:
288 * The mtimes of all its dependencies
289 * Whether it caused a parse.SkipPackage exception
291 Files causing parsing errors are evicted from the cache.