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Unified Diff: scons-2.0.1/engine/SCons/Executor.py

Issue 6711079: Added an unmodified copy of SCons to third_party. (Closed) Base URL: svn://svn.chromium.org/native_client/trunk/src/third_party/
Patch Set: '' Created 9 years, 9 months ago
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Index: scons-2.0.1/engine/SCons/Executor.py
===================================================================
--- scons-2.0.1/engine/SCons/Executor.py (revision 0)
+++ scons-2.0.1/engine/SCons/Executor.py (revision 0)
@@ -0,0 +1,633 @@
+"""SCons.Executor
+
+A module for executing actions with specific lists of target and source
+Nodes.
+
+"""
+
+#
+# Copyright (c) 2001, 2002, 2003, 2004, 2005, 2006, 2007, 2008, 2009, 2010 The SCons Foundation
+#
+# Permission is hereby granted, free of charge, to any person obtaining
+# a copy of this software and associated documentation files (the
+# "Software"), to deal in the Software without restriction, including
+# without limitation the rights to use, copy, modify, merge, publish,
+# distribute, sublicense, and/or sell copies of the Software, and to
+# permit persons to whom the Software is furnished to do so, subject to
+# the following conditions:
+#
+# The above copyright notice and this permission notice shall be included
+# in all copies or substantial portions of the Software.
+#
+# THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY
+# KIND, EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE
+# WARRANTIES OF MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
+# NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE
+# LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION
+# OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION
+# WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
+
+__revision__ = "src/engine/SCons/Executor.py 5134 2010/08/16 23:02:40 bdeegan"
+
+import collections
+
+from SCons.Debug import logInstanceCreation
+import SCons.Errors
+import SCons.Memoize
+
+
+class Batch(object):
+ """Remembers exact association between targets
+ and sources of executor."""
+ def __init__(self, targets=[], sources=[]):
+ self.targets = targets
+ self.sources = sources
+
+
+
+class TSList(collections.UserList):
+ """A class that implements $TARGETS or $SOURCES expansions by wrapping
+ an executor Method. This class is used in the Executor.lvars()
+ to delay creation of NodeList objects until they're needed.
+
+ Note that we subclass collections.UserList purely so that the
+ is_Sequence() function will identify an object of this class as
+ a list during variable expansion. We're not really using any
+ collections.UserList methods in practice.
+ """
+ def __init__(self, func):
+ self.func = func
+ def __getattr__(self, attr):
+ nl = self.func()
+ return getattr(nl, attr)
+ def __getitem__(self, i):
+ nl = self.func()
+ return nl[i]
+ def __getslice__(self, i, j):
+ nl = self.func()
+ i = max(i, 0); j = max(j, 0)
+ return nl[i:j]
+ def __str__(self):
+ nl = self.func()
+ return str(nl)
+ def __repr__(self):
+ nl = self.func()
+ return repr(nl)
+
+class TSObject(object):
+ """A class that implements $TARGET or $SOURCE expansions by wrapping
+ an Executor method.
+ """
+ def __init__(self, func):
+ self.func = func
+ def __getattr__(self, attr):
+ n = self.func()
+ return getattr(n, attr)
+ def __str__(self):
+ n = self.func()
+ if n:
+ return str(n)
+ return ''
+ def __repr__(self):
+ n = self.func()
+ if n:
+ return repr(n)
+ return ''
+
+def rfile(node):
+ """
+ A function to return the results of a Node's rfile() method,
+ if it exists, and the Node itself otherwise (if it's a Value
+ Node, e.g.).
+ """
+ try:
+ rfile = node.rfile
+ except AttributeError:
+ return node
+ else:
+ return rfile()
+
+
+class Executor(object):
+ """A class for controlling instances of executing an action.
+
+ This largely exists to hold a single association of an action,
+ environment, list of environment override dictionaries, targets
+ and sources for later processing as needed.
+ """
+
+ if SCons.Memoize.use_memoizer:
+ __metaclass__ = SCons.Memoize.Memoized_Metaclass
+
+ memoizer_counters = []
+
+ def __init__(self, action, env=None, overridelist=[{}],
+ targets=[], sources=[], builder_kw={}):
+ if __debug__: logInstanceCreation(self, 'Executor.Executor')
+ self.set_action_list(action)
+ self.pre_actions = []
+ self.post_actions = []
+ self.env = env
+ self.overridelist = overridelist
+ if targets or sources:
+ self.batches = [Batch(targets[:], sources[:])]
+ else:
+ self.batches = []
+ self.builder_kw = builder_kw
+ self._memo = {}
+
+ def get_lvars(self):
+ try:
+ return self.lvars
+ except AttributeError:
+ self.lvars = {
+ 'CHANGED_SOURCES' : TSList(self._get_changed_sources),
+ 'CHANGED_TARGETS' : TSList(self._get_changed_targets),
+ 'SOURCE' : TSObject(self._get_source),
+ 'SOURCES' : TSList(self._get_sources),
+ 'TARGET' : TSObject(self._get_target),
+ 'TARGETS' : TSList(self._get_targets),
+ 'UNCHANGED_SOURCES' : TSList(self._get_unchanged_sources),
+ 'UNCHANGED_TARGETS' : TSList(self._get_unchanged_targets),
+ }
+ return self.lvars
+
+ def _get_changes(self):
+ cs = []
+ ct = []
+ us = []
+ ut = []
+ for b in self.batches:
+ if b.targets[0].is_up_to_date():
+ us.extend(list(map(rfile, b.sources)))
+ ut.extend(b.targets)
+ else:
+ cs.extend(list(map(rfile, b.sources)))
+ ct.extend(b.targets)
+ self._changed_sources_list = SCons.Util.NodeList(cs)
+ self._changed_targets_list = SCons.Util.NodeList(ct)
+ self._unchanged_sources_list = SCons.Util.NodeList(us)
+ self._unchanged_targets_list = SCons.Util.NodeList(ut)
+
+ def _get_changed_sources(self, *args, **kw):
+ try:
+ return self._changed_sources_list
+ except AttributeError:
+ self._get_changes()
+ return self._changed_sources_list
+
+ def _get_changed_targets(self, *args, **kw):
+ try:
+ return self._changed_targets_list
+ except AttributeError:
+ self._get_changes()
+ return self._changed_targets_list
+
+ def _get_source(self, *args, **kw):
+ #return SCons.Util.NodeList([rfile(self.batches[0].sources[0]).get_subst_proxy()])
+ return rfile(self.batches[0].sources[0]).get_subst_proxy()
+
+ def _get_sources(self, *args, **kw):
+ return SCons.Util.NodeList([rfile(n).get_subst_proxy() for n in self.get_all_sources()])
+
+ def _get_target(self, *args, **kw):
+ #return SCons.Util.NodeList([self.batches[0].targets[0].get_subst_proxy()])
+ return self.batches[0].targets[0].get_subst_proxy()
+
+ def _get_targets(self, *args, **kw):
+ return SCons.Util.NodeList([n.get_subst_proxy() for n in self.get_all_targets()])
+
+ def _get_unchanged_sources(self, *args, **kw):
+ try:
+ return self._unchanged_sources_list
+ except AttributeError:
+ self._get_changes()
+ return self._unchanged_sources_list
+
+ def _get_unchanged_targets(self, *args, **kw):
+ try:
+ return self._unchanged_targets_list
+ except AttributeError:
+ self._get_changes()
+ return self._unchanged_targets_list
+
+ def get_action_targets(self):
+ if not self.action_list:
+ return []
+ targets_string = self.action_list[0].get_targets(self.env, self)
+ if targets_string[0] == '$':
+ targets_string = targets_string[1:]
+ return self.get_lvars()[targets_string]
+
+ def set_action_list(self, action):
+ import SCons.Util
+ if not SCons.Util.is_List(action):
+ if not action:
+ import SCons.Errors
+ raise SCons.Errors.UserError("Executor must have an action.")
+ action = [action]
+ self.action_list = action
+
+ def get_action_list(self):
+ return self.pre_actions + self.action_list + self.post_actions
+
+ def get_all_targets(self):
+ """Returns all targets for all batches of this Executor."""
+ result = []
+ for batch in self.batches:
+ result.extend(batch.targets)
+ return result
+
+ def get_all_sources(self):
+ """Returns all sources for all batches of this Executor."""
+ result = []
+ for batch in self.batches:
+ result.extend(batch.sources)
+ return result
+
+ def get_all_children(self):
+ """Returns all unique children (dependencies) for all batches
+ of this Executor.
+
+ The Taskmaster can recognize when it's already evaluated a
+ Node, so we don't have to make this list unique for its intended
+ canonical use case, but we expect there to be a lot of redundancy
+ (long lists of batched .cc files #including the same .h files
+ over and over), so removing the duplicates once up front should
+ save the Taskmaster a lot of work.
+ """
+ result = SCons.Util.UniqueList([])
+ for target in self.get_all_targets():
+ result.extend(target.children())
+ return result
+
+ def get_all_prerequisites(self):
+ """Returns all unique (order-only) prerequisites for all batches
+ of this Executor.
+ """
+ result = SCons.Util.UniqueList([])
+ for target in self.get_all_targets():
+ result.extend(target.prerequisites)
+ return result
+
+ def get_action_side_effects(self):
+
+ """Returns all side effects for all batches of this
+ Executor used by the underlying Action.
+ """
+ result = SCons.Util.UniqueList([])
+ for target in self.get_action_targets():
+ result.extend(target.side_effects)
+ return result
+
+ memoizer_counters.append(SCons.Memoize.CountValue('get_build_env'))
+
+ def get_build_env(self):
+ """Fetch or create the appropriate build Environment
+ for this Executor.
+ """
+ try:
+ return self._memo['get_build_env']
+ except KeyError:
+ pass
+
+ # Create the build environment instance with appropriate
+ # overrides. These get evaluated against the current
+ # environment's construction variables so that users can
+ # add to existing values by referencing the variable in
+ # the expansion.
+ overrides = {}
+ for odict in self.overridelist:
+ overrides.update(odict)
+
+ import SCons.Defaults
+ env = self.env or SCons.Defaults.DefaultEnvironment()
+ build_env = env.Override(overrides)
+
+ self._memo['get_build_env'] = build_env
+
+ return build_env
+
+ def get_build_scanner_path(self, scanner):
+ """Fetch the scanner path for this executor's targets and sources.
+ """
+ env = self.get_build_env()
+ try:
+ cwd = self.batches[0].targets[0].cwd
+ except (IndexError, AttributeError):
+ cwd = None
+ return scanner.path(env, cwd,
+ self.get_all_targets(),
+ self.get_all_sources())
+
+ def get_kw(self, kw={}):
+ result = self.builder_kw.copy()
+ result.update(kw)
+ result['executor'] = self
+ return result
+
+ def do_nothing(self, target, kw):
+ return 0
+
+ def do_execute(self, target, kw):
+ """Actually execute the action list."""
+ env = self.get_build_env()
+ kw = self.get_kw(kw)
+ status = 0
+ for act in self.get_action_list():
+ #args = (self.get_all_targets(), self.get_all_sources(), env)
+ args = ([], [], env)
+ status = act(*args, **kw)
+ if isinstance(status, SCons.Errors.BuildError):
+ status.executor = self
+ raise status
+ elif status:
+ msg = "Error %s" % status
+ raise SCons.Errors.BuildError(
+ errstr=msg,
+ node=self.batches[0].targets,
+ executor=self,
+ action=act)
+ return status
+
+ # use extra indirection because with new-style objects (Python 2.2
+ # and above) we can't override special methods, and nullify() needs
+ # to be able to do this.
+
+ def __call__(self, target, **kw):
+ return self.do_execute(target, kw)
+
+ def cleanup(self):
+ self._memo = {}
+
+ def add_sources(self, sources):
+ """Add source files to this Executor's list. This is necessary
+ for "multi" Builders that can be called repeatedly to build up
+ a source file list for a given target."""
+ # TODO(batch): extend to multiple batches
+ assert (len(self.batches) == 1)
+ # TODO(batch): remove duplicates?
+ sources = [x for x in sources if x not in self.batches[0].sources]
+ self.batches[0].sources.extend(sources)
+
+ def get_sources(self):
+ return self.batches[0].sources
+
+ def add_batch(self, targets, sources):
+ """Add pair of associated target and source to this Executor's list.
+ This is necessary for "batch" Builders that can be called repeatedly
+ to build up a list of matching target and source files that will be
+ used in order to update multiple target files at once from multiple
+ corresponding source files, for tools like MSVC that support it."""
+ self.batches.append(Batch(targets, sources))
+
+ def prepare(self):
+ """
+ Preparatory checks for whether this Executor can go ahead
+ and (try to) build its targets.
+ """
+ for s in self.get_all_sources():
+ if s.missing():
+ msg = "Source `%s' not found, needed by target `%s'."
+ raise SCons.Errors.StopError(msg % (s, self.batches[0].targets[0]))
+
+ def add_pre_action(self, action):
+ self.pre_actions.append(action)
+
+ def add_post_action(self, action):
+ self.post_actions.append(action)
+
+ # another extra indirection for new-style objects and nullify...
+
+ def my_str(self):
+ env = self.get_build_env()
+ return "\n".join([action.genstring(self.get_all_targets(),
+ self.get_all_sources(),
+ env)
+ for action in self.get_action_list()])
+
+
+ def __str__(self):
+ return self.my_str()
+
+ def nullify(self):
+ self.cleanup()
+ self.do_execute = self.do_nothing
+ self.my_str = lambda: ''
+
+ memoizer_counters.append(SCons.Memoize.CountValue('get_contents'))
+
+ def get_contents(self):
+ """Fetch the signature contents. This is the main reason this
+ class exists, so we can compute this once and cache it regardless
+ of how many target or source Nodes there are.
+ """
+ try:
+ return self._memo['get_contents']
+ except KeyError:
+ pass
+ env = self.get_build_env()
+ result = "".join([action.get_contents(self.get_all_targets(),
+ self.get_all_sources(),
+ env)
+ for action in self.get_action_list()])
+ self._memo['get_contents'] = result
+ return result
+
+ def get_timestamp(self):
+ """Fetch a time stamp for this Executor. We don't have one, of
+ course (only files do), but this is the interface used by the
+ timestamp module.
+ """
+ return 0
+
+ def scan_targets(self, scanner):
+ # TODO(batch): scan by batches
+ self.scan(scanner, self.get_all_targets())
+
+ def scan_sources(self, scanner):
+ # TODO(batch): scan by batches
+ if self.batches[0].sources:
+ self.scan(scanner, self.get_all_sources())
+
+ def scan(self, scanner, node_list):
+ """Scan a list of this Executor's files (targets or sources) for
+ implicit dependencies and update all of the targets with them.
+ This essentially short-circuits an N*M scan of the sources for
+ each individual target, which is a hell of a lot more efficient.
+ """
+ env = self.get_build_env()
+
+ # TODO(batch): scan by batches)
+ deps = []
+ if scanner:
+ for node in node_list:
+ node.disambiguate()
+ s = scanner.select(node)
+ if not s:
+ continue
+ path = self.get_build_scanner_path(s)
+ deps.extend(node.get_implicit_deps(env, s, path))
+ else:
+ kw = self.get_kw()
+ for node in node_list:
+ node.disambiguate()
+ scanner = node.get_env_scanner(env, kw)
+ if not scanner:
+ continue
+ scanner = scanner.select(node)
+ if not scanner:
+ continue
+ path = self.get_build_scanner_path(scanner)
+ deps.extend(node.get_implicit_deps(env, scanner, path))
+
+ deps.extend(self.get_implicit_deps())
+
+ for tgt in self.get_all_targets():
+ tgt.add_to_implicit(deps)
+
+ def _get_unignored_sources_key(self, node, ignore=()):
+ return (node,) + tuple(ignore)
+
+ memoizer_counters.append(SCons.Memoize.CountDict('get_unignored_sources', _get_unignored_sources_key))
+
+ def get_unignored_sources(self, node, ignore=()):
+ key = (node,) + tuple(ignore)
+ try:
+ memo_dict = self._memo['get_unignored_sources']
+ except KeyError:
+ memo_dict = {}
+ self._memo['get_unignored_sources'] = memo_dict
+ else:
+ try:
+ return memo_dict[key]
+ except KeyError:
+ pass
+
+ if node:
+ # TODO: better way to do this (it's a linear search,
+ # but it may not be critical path)?
+ sourcelist = []
+ for b in self.batches:
+ if node in b.targets:
+ sourcelist = b.sources
+ break
+ else:
+ sourcelist = self.get_all_sources()
+ if ignore:
+ idict = {}
+ for i in ignore:
+ idict[i] = 1
+ sourcelist = [s for s in sourcelist if s not in idict]
+
+ memo_dict[key] = sourcelist
+
+ return sourcelist
+
+ def get_implicit_deps(self):
+ """Return the executor's implicit dependencies, i.e. the nodes of
+ the commands to be executed."""
+ result = []
+ build_env = self.get_build_env()
+ for act in self.get_action_list():
+ deps = act.get_implicit_deps(self.get_all_targets(),
+ self.get_all_sources(),
+ build_env)
+ result.extend(deps)
+ return result
+
+
+
+_batch_executors = {}
+
+def GetBatchExecutor(key):
+ return _batch_executors[key]
+
+def AddBatchExecutor(key, executor):
+ assert key not in _batch_executors
+ _batch_executors[key] = executor
+
+nullenv = None
+
+
+def get_NullEnvironment():
+ """Use singleton pattern for Null Environments."""
+ global nullenv
+
+ import SCons.Util
+ class NullEnvironment(SCons.Util.Null):
+ import SCons.CacheDir
+ _CacheDir_path = None
+ _CacheDir = SCons.CacheDir.CacheDir(None)
+ def get_CacheDir(self):
+ return self._CacheDir
+
+ if not nullenv:
+ nullenv = NullEnvironment()
+ return nullenv
+
+class Null(object):
+ """A null Executor, with a null build Environment, that does
+ nothing when the rest of the methods call it.
+
+ This might be able to disapper when we refactor things to
+ disassociate Builders from Nodes entirely, so we're not
+ going to worry about unit tests for this--at least for now.
+ """
+ def __init__(self, *args, **kw):
+ if __debug__: logInstanceCreation(self, 'Executor.Null')
+ self.batches = [Batch(kw['targets'][:], [])]
+ def get_build_env(self):
+ return get_NullEnvironment()
+ def get_build_scanner_path(self):
+ return None
+ def cleanup(self):
+ pass
+ def prepare(self):
+ pass
+ def get_unignored_sources(self, *args, **kw):
+ return tuple(())
+ def get_action_targets(self):
+ return []
+ def get_action_list(self):
+ return []
+ def get_all_targets(self):
+ return self.batches[0].targets
+ def get_all_sources(self):
+ return self.batches[0].targets[0].sources
+ def get_all_children(self):
+ return self.batches[0].targets[0].children()
+ def get_all_prerequisites(self):
+ return []
+ def get_action_side_effects(self):
+ return []
+ def __call__(self, *args, **kw):
+ return 0
+ def get_contents(self):
+ return ''
+ def _morph(self):
+ """Morph this Null executor to a real Executor object."""
+ batches = self.batches
+ self.__class__ = Executor
+ self.__init__([])
+ self.batches = batches
+
+ # The following methods require morphing this Null Executor to a
+ # real Executor object.
+
+ def add_pre_action(self, action):
+ self._morph()
+ self.add_pre_action(action)
+ def add_post_action(self, action):
+ self._morph()
+ self.add_post_action(action)
+ def set_action_list(self, action):
+ self._morph()
+ self.set_action_list(action)
+
+
+# Local Variables:
+# tab-width:4
+# indent-tabs-mode:nil
+# End:
+# vim: set expandtab tabstop=4 shiftwidth=4:
Property changes on: scons-2.0.1/engine/SCons/Executor.py
___________________________________________________________________
Added: svn:eol-style
+ LF
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