From: Zac Medico Date: Wed, 11 Mar 2009 06:18:20 +0000 (-0000) Subject: Implement lazy evaluation of USE_EXPAND variables in config.setcpv(), since X-Git-Tag: v2.1.6.8~115 X-Git-Url: http://git.tremily.us/?a=commitdiff_plain;h=742b74a28650c2a0e1cdc675f6f2872d561b6e08;p=portage.git Implement lazy evaluation of USE_EXPAND variables in config.setcpv(), since those variables are only needed when an ebuild shell is spawned. Thanks to Marat Radchenko for testing this patch. He reports a 14% reduction in the time consumed for `emerge -vpe world` on an ARM device (from 3m12.008s to 2m45.055s). (trunk r12707) svn path=/main/branches/2.1.6/; revision=12962 --- diff --git a/pym/portage/__init__.py b/pym/portage/__init__.py index 3820dcf34..be54d3325 100644 --- a/pym/portage/__init__.py +++ b/pym/portage/__init__.py @@ -1205,6 +1205,7 @@ class config(object): "auto": self.configlist[6], "backupenv": self.configlist[7], "env": self.configlist[8] } + self._use_expand_dict = copy.deepcopy(clone._use_expand_dict) self.profiles = copy.deepcopy(clone.profiles) self.backupenv = self.configdict["backupenv"] self.pusedict = copy.deepcopy(clone.pusedict) @@ -1270,6 +1271,7 @@ class config(object): # back up our incremental variables: self.configdict={} + self._use_expand_dict = {} # configlist will contain: [ env.d, globals, defaults, conf, pkg, auto, backupenv, env ] self.configlist.append({}) self.configdict["env.d"] = self.configlist[-1] @@ -1455,7 +1457,7 @@ class config(object): pass del k, v - self.configdict["env"] = self.backupenv.copy() + self.configdict["env"] = util.LazyItemsDict(self.backupenv) # make.globals should not be relative to config_root # because it only contains constants. @@ -1955,6 +1957,86 @@ class config(object): DeprecationWarning) return 1 + class _lazy_use_expand(object): + """ + Lazily evaluate USE_EXPAND variables since they are only needed when + an ebuild shell is spawned. Variables values are made consistent with + the previously calculated USE settings. + """ + + def __init__(self, use, usemask, iuse_implicit, + use_expand_split, use_expand_dict): + self._use = use + self._usemask = usemask + self._iuse_implicit = iuse_implicit + self._use_expand_split = use_expand_split + self._use_expand_dict = use_expand_dict + + def __getitem__(self, key): + prefix = key.lower() + '_' + prefix_len = len(prefix) + expand_flags = set( x[prefix_len:] for x in self._use \ + if x[:prefix_len] == prefix ) + var_split = self._use_expand_dict.get(key, '').split() + # Preserve the order of var_split because it can matter for things + # like LINGUAS. + var_split = [ x for x in var_split if x in expand_flags ] + var_split.extend(expand_flags.difference(var_split)) + has_wildcard = '*' in expand_flags + if has_wildcard: + var_split = [ x for x in var_split if x != "*" ] + has_iuse = set() + for x in self._iuse_implicit: + if x[:prefix_len] == prefix: + has_iuse.add(x[prefix_len:]) + if has_wildcard: + # * means to enable everything in IUSE that's not masked + if has_iuse: + usemask = self._usemask + for suffix in has_iuse: + x = prefix + suffix + if x not in usemask: + if suffix not in expand_flags: + var_split.append(suffix) + else: + # If there is a wildcard and no matching flags in IUSE then + # LINGUAS should be unset so that all .mo files are + # installed. + var_split = [] + # Make the flags unique and filter them according to IUSE. + # Also, continue to preserve order for things like LINGUAS + # and filter any duplicates that variable may contain. + filtered_var_split = [] + remaining = has_iuse.intersection(var_split) + for x in var_split: + if x in remaining: + remaining.remove(x) + filtered_var_split.append(x) + var_split = filtered_var_split + + if var_split: + value = ' '.join(var_split) + else: + # Don't export empty USE_EXPAND vars unless the user config + # exports them as empty. This is required for vars such as + # LINGUAS, where unset and empty have different meanings. + if has_wildcard: + # ebuild.sh will see this and unset the variable so + # that things like LINGUAS work properly + value = '*' + else: + if has_iuse: + value = '' + else: + # It's not in IUSE, so just allow the variable content + # to pass through if it is defined somewhere. This + # allows packages that support LINGUAS but don't + # declare it in IUSE to use the variable outside of the + # USE_EXPAND context. + value = None + + return value + def setcpv(self, mycpv, use_cache=1, mydb=None): """ Load a particular CPV into the config, this lets us see the @@ -2116,69 +2198,34 @@ class config(object): # Use the calculated USE flags to regenerate the USE_EXPAND flags so # that they are consistent. For optimal performance, use slice # comparison instead of startswith(). - use_expand = self.get("USE_EXPAND", "").split() - for var in use_expand: - prefix = var.lower() + "_" + use_expand_split = self.get("USE_EXPAND", "").split() + lazy_use_expand = self._lazy_use_expand(use, self.usemask, + iuse_implicit, use_expand_split, self._use_expand_dict) + use_expand_iuse = set() + for key in use_expand_split: + prefix = key.lower() + '_' prefix_len = len(prefix) expand_flags = set( x[prefix_len:] for x in use \ if x[:prefix_len] == prefix ) - var_split = self.get(var, "").split() - # Preserve the order of var_split because it can matter for things - # like LINGUAS. - var_split = [ x for x in var_split if x in expand_flags ] - var_split.extend(expand_flags.difference(var_split)) - has_wildcard = "*" in var_split - if has_wildcard: - var_split = [ x for x in var_split if x != "*" ] - has_iuse = set() + use_expand_iuse.clear() for x in iuse_implicit: if x[:prefix_len] == prefix: - has_iuse.add(x[prefix_len:]) - if has_wildcard: - # * means to enable everything in IUSE that's not masked - if has_iuse: - for suffix in has_iuse: - x = prefix + suffix - if x not in usemask: - if suffix not in expand_flags: - var_split.append(suffix) - use.add(x) - else: - # If there is a wildcard and no matching flags in IUSE then - # LINGUAS should be unset so that all .mo files are - # installed. - var_split = [] - # Make the flags unique and filter them according to IUSE. - # Also, continue to preserve order for things like LINGUAS - # and filter any duplicates that variable may contain. - filtered_var_split = [] - remaining = has_iuse.intersection(var_split) - for x in var_split: - if x in remaining: - remaining.remove(x) - filtered_var_split.append(x) - var_split = filtered_var_split - - if var_split: - self[var] = " ".join(var_split) + use_expand_iuse.add(x) + # * means to enable everything in IUSE that's not masked + if use_expand_iuse and '*' in expand_flags: + for x in use_expand_iuse: + if x not in usemask: + use.add(x) + if use_expand_iuse: + self.configdict['env'].addLazySingleton( + key, lazy_use_expand.__getitem__, key) else: - # Don't export empty USE_EXPAND vars unless the user config - # exports them as empty. This is required for vars such as - # LINGUAS, where unset and empty have different meanings. - if has_wildcard: - # ebuild.sh will see this and unset the variable so - # that things like LINGUAS work properly - self[var] = "*" - else: - if has_iuse: - self[var] = "" - else: - # It's not in IUSE, so just allow the variable content - # to pass through if it is defined somewhere. This - # allows packages that support LINGUAS but don't - # declare it in IUSE to use the variable outside of the - # USE_EXPAND context. - pass + # It's not in IUSE, so just allow the variable content + # to pass through if it is defined somewhere. This + # allows packages that support LINGUAS but don't + # declare it in IUSE to use the variable outside of the + # USE_EXPAND context. + pass # Filtered for the ebuild environment. Store this in a separate # attribute since we still want to be able to see global USE @@ -2660,6 +2707,12 @@ class config(object): self.configdict["auto"]["USE"] = "" use_expand = self.get("USE_EXPAND", "").split() + use_expand_dict = self._use_expand_dict + use_expand_dict.clear() + for k in use_expand: + v = self.get(k) + if v is not None: + use_expand_dict[k] = v if not self.uvlist: for x in self["USE_ORDER"].split(":"):