mirror of
https://git.yoctoproject.org/poky
synced 2026-02-06 16:56:37 +01:00
dfce2695b9
Currently if passing expand=True to getVar() function, it will pass the handling to getVarFlag(), which doesn't get any benefit from the expand cache. Call the expand() function separately in getVar() to make use of the expand cache, which can decrease the parsing time by 40%. (from current 49s to 27s) (Bitbake rev: 6555a77c199f41bf35460138764e03e30c56d29f) Signed-off-by: Dongxiao Xu <dongxiao.xu@intel.com> Signed-off-by: Richard Purdie <richard.purdie@linuxfoundation.org>
440 lines
14 KiB
Python
440 lines
14 KiB
Python
# ex:ts=4:sw=4:sts=4:et
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# -*- tab-width: 4; c-basic-offset: 4; indent-tabs-mode: nil -*-
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"""
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BitBake Smart Dictionary Implementation
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Functions for interacting with the data structure used by the
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BitBake build tools.
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"""
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# Copyright (C) 2003, 2004 Chris Larson
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# Copyright (C) 2004, 2005 Seb Frankengul
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# Copyright (C) 2005, 2006 Holger Hans Peter Freyther
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# Copyright (C) 2005 Uli Luckas
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# Copyright (C) 2005 ROAD GmbH
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#
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# This program is free software; you can redistribute it and/or modify
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# it under the terms of the GNU General Public License version 2 as
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# published by the Free Software Foundation.
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#
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# This program is distributed in the hope that it will be useful,
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# but WITHOUT ANY WARRANTY; without even the implied warranty of
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# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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# GNU General Public License for more details.
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#
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# You should have received a copy of the GNU General Public License along
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# with this program; if not, write to the Free Software Foundation, Inc.,
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# 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
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# Based on functions from the base bb module, Copyright 2003 Holger Schurig
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import copy, re
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from collections import MutableMapping
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import logging
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import bb, bb.codeparser
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from bb import utils
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from bb.COW import COWDictBase
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logger = logging.getLogger("BitBake.Data")
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__setvar_keyword__ = ["_append", "_prepend"]
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__setvar_regexp__ = re.compile('(?P<base>.*?)(?P<keyword>_append|_prepend)(_(?P<add>.*))?')
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__expand_var_regexp__ = re.compile(r"\${[^{}]+}")
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__expand_python_regexp__ = re.compile(r"\${@.+?}")
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class VariableParse:
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def __init__(self, varname, d, val = None):
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self.varname = varname
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self.d = d
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self.value = val
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self.references = set()
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self.execs = set()
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def var_sub(self, match):
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key = match.group()[2:-1]
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if self.varname and key:
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if self.varname == key:
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raise Exception("variable %s references itself!" % self.varname)
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var = self.d.getVar(key, 1)
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if var is not None:
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self.references.add(key)
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return var
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else:
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return match.group()
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def python_sub(self, match):
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code = match.group()[3:-1]
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codeobj = compile(code.strip(), self.varname or "<expansion>", "eval")
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parser = bb.codeparser.PythonParser()
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parser.parse_python(code)
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self.references |= parser.references
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self.execs |= parser.execs
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value = utils.better_eval(codeobj, DataContext(self.d))
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return str(value)
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class DataContext(dict):
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def __init__(self, metadata, **kwargs):
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self.metadata = metadata
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dict.__init__(self, **kwargs)
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self['d'] = metadata
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def __missing__(self, key):
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value = self.metadata.getVar(key, True)
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if value is None or self.metadata.getVarFlag(key, 'func'):
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raise KeyError(key)
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else:
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return value
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class ExpansionError(Exception):
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def __init__(self, varname, expression, exception):
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self.expression = expression
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self.variablename = varname
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self.exception = exception
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self.msg = "Failure expanding variable %s, expression was %s which triggered exception %s: %s" % (varname, expression, type(exception).__name__, exception)
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Exception.__init__(self, self.msg)
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self.args = (varname, expression, exception)
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def __str__(self):
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return self.msg
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class DataSmart(MutableMapping):
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def __init__(self, special = COWDictBase.copy(), seen = COWDictBase.copy() ):
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self.dict = {}
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# cookie monster tribute
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self._special_values = special
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self._seen_overrides = seen
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self.expand_cache = {}
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def expandWithRefs(self, s, varname):
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if not isinstance(s, basestring): # sanity check
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return VariableParse(varname, self, s)
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if varname and varname in self.expand_cache:
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return self.expand_cache[varname]
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varparse = VariableParse(varname, self)
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while s.find('${') != -1:
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olds = s
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try:
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s = __expand_var_regexp__.sub(varparse.var_sub, s)
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s = __expand_python_regexp__.sub(varparse.python_sub, s)
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if s == olds:
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break
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except ExpansionError:
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raise
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except Exception as exc:
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raise ExpansionError(varname, s, exc)
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varparse.value = s
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if varname:
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self.expand_cache[varname] = varparse
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return varparse
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def expand(self, s, varname):
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return self.expandWithRefs(s, varname).value
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def finalize(self):
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"""Performs final steps upon the datastore, including application of overrides"""
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overrides = (self.getVar("OVERRIDES", True) or "").split(":") or []
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#
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# Well let us see what breaks here. We used to iterate
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# over each variable and apply the override and then
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# do the line expanding.
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# If we have bad luck - which we will have - the keys
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# where in some order that is so important for this
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# method which we don't have anymore.
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# Anyway we will fix that and write test cases this
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# time.
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#
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# First we apply all overrides
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# Then we will handle _append and _prepend
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#
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for o in overrides:
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# calculate '_'+override
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l = len(o) + 1
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# see if one should even try
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if o not in self._seen_overrides:
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continue
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vars = self._seen_overrides[o].copy()
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for var in vars:
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name = var[:-l]
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try:
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self.setVar(name, self.getVar(var, False))
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self.delVar(var)
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except Exception:
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logger.info("Untracked delVar")
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# now on to the appends and prepends
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for op in __setvar_keyword__:
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if op in self._special_values:
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appends = self._special_values[op] or []
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for append in appends:
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keep = []
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for (a, o) in self.getVarFlag(append, op) or []:
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if o and not o in overrides:
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keep.append((a ,o))
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continue
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if op == "_append":
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sval = self.getVar(append, False) or ""
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sval += a
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self.setVar(append, sval)
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elif op == "_prepend":
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sval = a + (self.getVar(append, False) or "")
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self.setVar(append, sval)
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# We save overrides that may be applied at some later stage
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if keep:
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self.setVarFlag(append, op, keep)
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else:
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self.delVarFlag(append, op)
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def initVar(self, var):
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self.expand_cache = {}
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if not var in self.dict:
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self.dict[var] = {}
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def _findVar(self, var):
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dest = self.dict
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while dest:
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if var in dest:
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return dest[var]
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if "_data" not in dest:
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break
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dest = dest["_data"]
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def _makeShadowCopy(self, var):
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if var in self.dict:
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return
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local_var = self._findVar(var)
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if local_var:
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self.dict[var] = copy.copy(local_var)
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else:
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self.initVar(var)
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def setVar(self, var, value):
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self.expand_cache = {}
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match = __setvar_regexp__.match(var)
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if match and match.group("keyword") in __setvar_keyword__:
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base = match.group('base')
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keyword = match.group("keyword")
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override = match.group('add')
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l = self.getVarFlag(base, keyword) or []
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l.append([value, override])
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self.setVarFlag(base, keyword, l)
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# todo make sure keyword is not __doc__ or __module__
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# pay the cookie monster
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try:
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self._special_values[keyword].add( base )
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except KeyError:
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self._special_values[keyword] = set()
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self._special_values[keyword].add( base )
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return
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if not var in self.dict:
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self._makeShadowCopy(var)
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# more cookies for the cookie monster
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if '_' in var:
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override = var[var.rfind('_')+1:]
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if len(override) > 0:
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if override not in self._seen_overrides:
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self._seen_overrides[override] = set()
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self._seen_overrides[override].add( var )
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# setting var
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self.dict[var]["content"] = value
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def getVar(self, var, expand=False, noweakdefault=False):
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value = self.getVarFlag(var, "content", False, noweakdefault)
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# Call expand() separately to make use of the expand cache
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if expand and value:
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return self.expand(value, var)
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return value
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def renameVar(self, key, newkey):
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"""
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Rename the variable key to newkey
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"""
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val = self.getVar(key, 0)
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if val is not None:
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self.setVar(newkey, val)
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for i in ('_append', '_prepend'):
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src = self.getVarFlag(key, i)
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if src is None:
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continue
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dest = self.getVarFlag(newkey, i) or []
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dest.extend(src)
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self.setVarFlag(newkey, i, dest)
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if i in self._special_values and key in self._special_values[i]:
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self._special_values[i].remove(key)
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self._special_values[i].add(newkey)
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self.delVar(key)
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def delVar(self, var):
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self.expand_cache = {}
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self.dict[var] = {}
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if '_' in var:
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override = var[var.rfind('_')+1:]
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if override and override in self._seen_overrides and var in self._seen_overrides[override]:
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self._seen_overrides[override].remove(var)
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def setVarFlag(self, var, flag, flagvalue):
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if not var in self.dict:
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self._makeShadowCopy(var)
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self.dict[var][flag] = flagvalue
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def getVarFlag(self, var, flag, expand=False, noweakdefault=False):
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local_var = self._findVar(var)
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value = None
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if local_var:
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if flag in local_var:
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value = copy.copy(local_var[flag])
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elif flag == "content" and "defaultval" in local_var and not noweakdefault:
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value = copy.copy(local_var["defaultval"])
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if expand and value:
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value = self.expand(value, None)
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return value
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def delVarFlag(self, var, flag):
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local_var = self._findVar(var)
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if not local_var:
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return
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if not var in self.dict:
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self._makeShadowCopy(var)
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if var in self.dict and flag in self.dict[var]:
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del self.dict[var][flag]
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def setVarFlags(self, var, flags):
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if not var in self.dict:
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self._makeShadowCopy(var)
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for i in flags:
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if i == "content":
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continue
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self.dict[var][i] = flags[i]
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def getVarFlags(self, var):
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local_var = self._findVar(var)
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flags = {}
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if local_var:
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for i in local_var:
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if i == "content":
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continue
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flags[i] = local_var[i]
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if len(flags) == 0:
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return None
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return flags
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def delVarFlags(self, var):
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if not var in self.dict:
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self._makeShadowCopy(var)
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if var in self.dict:
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content = None
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# try to save the content
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if "content" in self.dict[var]:
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content = self.dict[var]["content"]
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self.dict[var] = {}
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self.dict[var]["content"] = content
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else:
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del self.dict[var]
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def createCopy(self):
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"""
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Create a copy of self by setting _data to self
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"""
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# we really want this to be a DataSmart...
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data = DataSmart(seen=self._seen_overrides.copy(), special=self._special_values.copy())
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data.dict["_data"] = self.dict
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return data
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def expandVarref(self, variable, parents=False):
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"""Find all references to variable in the data and expand it
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in place, optionally descending to parent datastores."""
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if parents:
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keys = iter(self)
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else:
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keys = self.localkeys()
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ref = '${%s}' % variable
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value = self.getVar(variable, False)
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for key in keys:
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referrervalue = self.getVar(key, False)
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if referrervalue and ref in referrervalue:
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self.setVar(key, referrervalue.replace(ref, value))
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def localkeys(self):
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for key in self.dict:
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if key != '_data':
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yield key
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def __iter__(self):
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def keylist(d):
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klist = set()
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for key in d:
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if key == "_data":
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continue
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if not d[key]:
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continue
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klist.add(key)
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if "_data" in d:
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klist |= keylist(d["_data"])
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return klist
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for k in keylist(self.dict):
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yield k
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def __len__(self):
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return len(frozenset(self))
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def __getitem__(self, item):
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value = self.getVar(item, False)
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if value is None:
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raise KeyError(item)
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else:
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return value
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def __setitem__(self, var, value):
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self.setVar(var, value)
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def __delitem__(self, var):
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self.delVar(var)
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