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1330 lines
46 KiB
1330 lines
46 KiB
"""SCons.Node
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The Node package for the SCons software construction utility.
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This is, in many ways, the heart of SCons.
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A Node is where we encapsulate all of the dependency information about
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any thing that SCons can build, or about any thing which SCons can use
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to build some other thing. The canonical "thing," of course, is a file,
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but a Node can also represent something remote (like a web page) or
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something completely abstract (like an Alias).
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Each specific type of "thing" is specifically represented by a subclass
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of the Node base class: Node.FS.File for files, Node.Alias for aliases,
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etc. Dependency information is kept here in the base class, and
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information specific to files/aliases/etc. is in the subclass. The
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goal, if we've done this correctly, is that any type of "thing" should
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be able to depend on any other type of "thing."
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"""
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#
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# Copyright (c) 2001, 2002, 2003, 2004, 2005, 2006, 2007, 2008 The SCons Foundation
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#
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# Permission is hereby granted, free of charge, to any person obtaining
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# a copy of this software and associated documentation files (the
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# "Software"), to deal in the Software without restriction, including
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# without limitation the rights to use, copy, modify, merge, publish,
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# distribute, sublicense, and/or sell copies of the Software, and to
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# permit persons to whom the Software is furnished to do so, subject to
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# the following conditions:
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#
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# The above copyright notice and this permission notice shall be included
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# in all copies or substantial portions of the Software.
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#
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# THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY
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# KIND, EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE
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# WARRANTIES OF MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
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# NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE
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# LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION
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# OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION
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# WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
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#
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__revision__ = "src/engine/SCons/Node/__init__.py 3842 2008/12/20 22:59:52 scons"
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import copy
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from itertools import chain, izip
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import string
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import UserList
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from SCons.Debug import logInstanceCreation
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import SCons.Executor
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import SCons.Memoize
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import SCons.Util
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from SCons.Debug import Trace
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def classname(obj):
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return string.split(str(obj.__class__), '.')[-1]
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# Node states
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#
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# These are in "priority" order, so that the maximum value for any
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# child/dependency of a node represents the state of that node if
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# it has no builder of its own. The canonical example is a file
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# system directory, which is only up to date if all of its children
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# were up to date.
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no_state = 0
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pending = 1
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executing = 2
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up_to_date = 3
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executed = 4
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failed = 5
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StateString = {
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0 : "no_state",
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1 : "pending",
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2 : "executing",
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3 : "up_to_date",
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4 : "executed",
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5 : "failed",
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}
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# controls whether implicit dependencies are cached:
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implicit_cache = 0
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# controls whether implicit dep changes are ignored:
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implicit_deps_unchanged = 0
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# controls whether the cached implicit deps are ignored:
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implicit_deps_changed = 0
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# A variable that can be set to an interface-specific function be called
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# to annotate a Node with information about its creation.
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def do_nothing(node): pass
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Annotate = do_nothing
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# Classes for signature info for Nodes.
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class NodeInfoBase:
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"""
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The generic base class for signature information for a Node.
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Node subclasses should subclass NodeInfoBase to provide their own
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logic for dealing with their own Node-specific signature information.
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"""
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current_version_id = 1
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def __init__(self, node):
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# Create an object attribute from the class attribute so it ends up
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# in the pickled data in the .sconsign file.
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self._version_id = self.current_version_id
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def update(self, node):
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try:
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field_list = self.field_list
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except AttributeError:
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return
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for f in field_list:
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try:
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delattr(self, f)
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except AttributeError:
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pass
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try:
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func = getattr(node, 'get_' + f)
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except AttributeError:
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pass
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else:
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setattr(self, f, func())
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def convert(self, node, val):
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pass
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def merge(self, other):
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self.__dict__.update(other.__dict__)
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def format(self, field_list=None, names=0):
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if field_list is None:
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try:
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field_list = self.field_list
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except AttributeError:
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field_list = self.__dict__.keys()
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field_list.sort()
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fields = []
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for field in field_list:
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try:
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f = getattr(self, field)
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except AttributeError:
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f = None
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f = str(f)
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if names:
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f = field + ': ' + f
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fields.append(f)
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return fields
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class BuildInfoBase:
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"""
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The generic base class for build information for a Node.
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This is what gets stored in a .sconsign file for each target file.
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It contains a NodeInfo instance for this node (signature information
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that's specific to the type of Node) and direct attributes for the
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generic build stuff we have to track: sources, explicit dependencies,
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implicit dependencies, and action information.
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"""
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current_version_id = 1
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def __init__(self, node):
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# Create an object attribute from the class attribute so it ends up
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# in the pickled data in the .sconsign file.
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self._version_id = self.current_version_id
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self.bsourcesigs = []
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self.bdependsigs = []
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self.bimplicitsigs = []
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self.bactsig = None
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def merge(self, other):
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self.__dict__.update(other.__dict__)
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class Node:
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"""The base Node class, for entities that we know how to
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build, or use to build other Nodes.
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"""
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if SCons.Memoize.use_memoizer:
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__metaclass__ = SCons.Memoize.Memoized_Metaclass
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memoizer_counters = []
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class Attrs:
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pass
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def __init__(self):
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if __debug__: logInstanceCreation(self, 'Node.Node')
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# Note that we no longer explicitly initialize a self.builder
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# attribute to None here. That's because the self.builder
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# attribute may be created on-the-fly later by a subclass (the
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# canonical example being a builder to fetch a file from a
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# source code system like CVS or Subversion).
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# Each list of children that we maintain is accompanied by a
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# dictionary used to look up quickly whether a node is already
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# present in the list. Empirical tests showed that it was
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# fastest to maintain them as side-by-side Node attributes in
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# this way, instead of wrapping up each list+dictionary pair in
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# a class. (Of course, we could always still do that in the
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# future if we had a good reason to...).
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self.sources = [] # source files used to build node
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self.sources_set = set()
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self._specific_sources = False
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self.depends = [] # explicit dependencies (from Depends)
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self.depends_set = set()
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self.ignore = [] # dependencies to ignore
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self.ignore_set = set()
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self.prerequisites = SCons.Util.UniqueList()
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self.implicit = None # implicit (scanned) dependencies (None means not scanned yet)
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self.waiting_parents = set()
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self.waiting_s_e = set()
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self.ref_count = 0
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self.wkids = None # Kids yet to walk, when it's an array
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self.env = None
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self.state = no_state
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self.precious = None
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self.noclean = 0
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self.nocache = 0
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self.always_build = None
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self.includes = None
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self.attributes = self.Attrs() # Generic place to stick information about the Node.
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self.side_effect = 0 # true iff this node is a side effect
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self.side_effects = [] # the side effects of building this target
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self.linked = 0 # is this node linked to the variant directory?
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self.clear_memoized_values()
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# Let the interface in which the build engine is embedded
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# annotate this Node with its own info (like a description of
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# what line in what file created the node, for example).
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Annotate(self)
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def disambiguate(self, must_exist=None):
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return self
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def get_suffix(self):
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return ''
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memoizer_counters.append(SCons.Memoize.CountValue('get_build_env'))
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def get_build_env(self):
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"""Fetch the appropriate Environment to build this node.
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"""
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try:
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return self._memo['get_build_env']
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except KeyError:
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pass
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result = self.get_executor().get_build_env()
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self._memo['get_build_env'] = result
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return result
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def get_build_scanner_path(self, scanner):
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"""Fetch the appropriate scanner path for this node."""
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return self.get_executor().get_build_scanner_path(scanner)
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def set_executor(self, executor):
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"""Set the action executor for this node."""
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self.executor = executor
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def get_executor(self, create=1):
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"""Fetch the action executor for this node. Create one if
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there isn't already one, and requested to do so."""
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try:
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executor = self.executor
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except AttributeError:
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if not create:
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raise
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try:
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act = self.builder.action
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except AttributeError:
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executor = SCons.Executor.Null(targets=[self])
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else:
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executor = SCons.Executor.Executor(act,
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self.env or self.builder.env,
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[self.builder.overrides],
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[self],
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self.sources)
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self.executor = executor
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return executor
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def executor_cleanup(self):
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"""Let the executor clean up any cached information."""
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try:
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executor = self.get_executor(create=None)
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except AttributeError:
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pass
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else:
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executor.cleanup()
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def reset_executor(self):
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"Remove cached executor; forces recompute when needed."
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try:
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delattr(self, 'executor')
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except AttributeError:
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pass
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def retrieve_from_cache(self):
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"""Try to retrieve the node's content from a cache
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This method is called from multiple threads in a parallel build,
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so only do thread safe stuff here. Do thread unsafe stuff in
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built().
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Returns true iff the node was successfully retrieved.
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"""
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return 0
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#
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# Taskmaster interface subsystem
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#
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def make_ready(self):
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"""Get a Node ready for evaluation.
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This is called before the Taskmaster decides if the Node is
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up-to-date or not. Overriding this method allows for a Node
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subclass to be disambiguated if necessary, or for an implicit
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source builder to be attached.
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"""
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pass
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def prepare(self):
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"""Prepare for this Node to be built.
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This is called after the Taskmaster has decided that the Node
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is out-of-date and must be rebuilt, but before actually calling
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the method to build the Node.
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This default implementation checks that explicit or implicit
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dependencies either exist or are derived, and initializes the
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BuildInfo structure that will hold the information about how
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this node is, uh, built.
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(The existence of source files is checked separately by the
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Executor, which aggregates checks for all of the targets built
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by a specific action.)
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Overriding this method allows for for a Node subclass to remove
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the underlying file from the file system. Note that subclass
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methods should call this base class method to get the child
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check and the BuildInfo structure.
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"""
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for d in self.depends:
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if d.missing():
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msg = "Explicit dependency `%s' not found, needed by target `%s'."
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raise SCons.Errors.StopError, msg % (d, self)
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if not self.implicit is None:
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for i in self.implicit:
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if i.missing():
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msg = "Implicit dependency `%s' not found, needed by target `%s'."
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raise SCons.Errors.StopError, msg % (i, self)
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self.binfo = self.get_binfo()
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def build(self, **kw):
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"""Actually build the node.
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|
This is called by the Taskmaster after it's decided that the
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Node is out-of-date and must be rebuilt, and after the prepare()
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method has gotten everything, uh, prepared.
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This method is called from multiple threads in a parallel build,
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so only do thread safe stuff here. Do thread unsafe stuff
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in built().
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"""
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try:
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apply(self.get_executor(), (self,), kw)
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except SCons.Errors.BuildError, e:
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e.node = self
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raise
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|
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|
def built(self):
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"""Called just after this node is successfully built."""
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# Clear the implicit dependency caches of any Nodes
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# waiting for this Node to be built.
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for parent in self.waiting_parents:
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parent.implicit = None
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self.clear()
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self.ninfo.update(self)
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|
|
def visited(self):
|
|
"""Called just after this node has been visited (with or
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without a build)."""
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|
try:
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binfo = self.binfo
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|
except AttributeError:
|
|
# Apparently this node doesn't need build info, so
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|
# don't bother calculating or storing it.
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|
pass
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|
else:
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self.ninfo.update(self)
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|
self.store_info()
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|
|
#
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#
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#
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def add_to_waiting_s_e(self, node):
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self.waiting_s_e.add(node)
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|
|
|
def add_to_waiting_parents(self, node):
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|
"""
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|
Returns the number of nodes added to our waiting parents list:
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1 if we add a unique waiting parent, 0 if not. (Note that the
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returned values are intended to be used to increment a reference
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|
count, so don't think you can "clean up" this function by using
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True and False instead...)
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"""
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|
wp = self.waiting_parents
|
|
if node in wp:
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return 0
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wp.add(node)
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return 1
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|
|
|
def postprocess(self):
|
|
"""Clean up anything we don't need to hang onto after we've
|
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been built."""
|
|
self.executor_cleanup()
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|
self.waiting_parents = set()
|
|
|
|
def clear(self):
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|
"""Completely clear a Node of all its cached state (so that it
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|
can be re-evaluated by interfaces that do continuous integration
|
|
builds).
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|
"""
|
|
# The del_binfo() call here isn't necessary for normal execution,
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|
# but is for interactive mode, where we might rebuild the same
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# target and need to start from scratch.
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self.del_binfo()
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self.clear_memoized_values()
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|
self.ninfo = self.new_ninfo()
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|
self.executor_cleanup()
|
|
try:
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|
delattr(self, '_calculated_sig')
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|
except AttributeError:
|
|
pass
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|
self.includes = None
|
|
|
|
def clear_memoized_values(self):
|
|
self._memo = {}
|
|
|
|
def builder_set(self, builder):
|
|
self.builder = builder
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|
try:
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|
del self.executor
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|
except AttributeError:
|
|
pass
|
|
|
|
def has_builder(self):
|
|
"""Return whether this Node has a builder or not.
|
|
|
|
In Boolean tests, this turns out to be a *lot* more efficient
|
|
than simply examining the builder attribute directly ("if
|
|
node.builder: ..."). When the builder attribute is examined
|
|
directly, it ends up calling __getattr__ for both the __len__
|
|
and __nonzero__ attributes on instances of our Builder Proxy
|
|
class(es), generating a bazillion extra calls and slowing
|
|
things down immensely.
|
|
"""
|
|
try:
|
|
b = self.builder
|
|
except AttributeError:
|
|
# There was no explicit builder for this Node, so initialize
|
|
# the self.builder attribute to None now.
|
|
b = self.builder = None
|
|
return not b is None
|
|
|
|
def set_explicit(self, is_explicit):
|
|
self.is_explicit = is_explicit
|
|
|
|
def has_explicit_builder(self):
|
|
"""Return whether this Node has an explicit builder
|
|
|
|
This allows an internal Builder created by SCons to be marked
|
|
non-explicit, so that it can be overridden by an explicit
|
|
builder that the user supplies (the canonical example being
|
|
directories)."""
|
|
try:
|
|
return self.is_explicit
|
|
except AttributeError:
|
|
self.is_explicit = None
|
|
return self.is_explicit
|
|
|
|
def get_builder(self, default_builder=None):
|
|
"""Return the set builder, or a specified default value"""
|
|
try:
|
|
return self.builder
|
|
except AttributeError:
|
|
return default_builder
|
|
|
|
multiple_side_effect_has_builder = has_builder
|
|
|
|
def is_derived(self):
|
|
"""
|
|
Returns true iff this node is derived (i.e. built).
|
|
|
|
This should return true only for nodes whose path should be in
|
|
the variant directory when duplicate=0 and should contribute their build
|
|
signatures when they are used as source files to other derived files. For
|
|
example: source with source builders are not derived in this sense,
|
|
and hence should not return true.
|
|
"""
|
|
return self.has_builder() or self.side_effect
|
|
|
|
def alter_targets(self):
|
|
"""Return a list of alternate targets for this Node.
|
|
"""
|
|
return [], None
|
|
|
|
def get_found_includes(self, env, scanner, path):
|
|
"""Return the scanned include lines (implicit dependencies)
|
|
found in this node.
|
|
|
|
The default is no implicit dependencies. We expect this method
|
|
to be overridden by any subclass that can be scanned for
|
|
implicit dependencies.
|
|
"""
|
|
return []
|
|
|
|
def get_implicit_deps(self, env, scanner, path):
|
|
"""Return a list of implicit dependencies for this node.
|
|
|
|
This method exists to handle recursive invocation of the scanner
|
|
on the implicit dependencies returned by the scanner, if the
|
|
scanner's recursive flag says that we should.
|
|
"""
|
|
if not scanner:
|
|
return []
|
|
|
|
# Give the scanner a chance to select a more specific scanner
|
|
# for this Node.
|
|
#scanner = scanner.select(self)
|
|
|
|
nodes = [self]
|
|
seen = {}
|
|
seen[self] = 1
|
|
deps = []
|
|
while nodes:
|
|
n = nodes.pop(0)
|
|
d = filter(lambda x, seen=seen: not seen.has_key(x),
|
|
n.get_found_includes(env, scanner, path))
|
|
if d:
|
|
deps.extend(d)
|
|
for n in d:
|
|
seen[n] = 1
|
|
nodes.extend(scanner.recurse_nodes(d))
|
|
|
|
return deps
|
|
|
|
def get_env_scanner(self, env, kw={}):
|
|
return env.get_scanner(self.scanner_key())
|
|
|
|
def get_target_scanner(self):
|
|
return self.builder.target_scanner
|
|
|
|
def get_source_scanner(self, node):
|
|
"""Fetch the source scanner for the specified node
|
|
|
|
NOTE: "self" is the target being built, "node" is
|
|
the source file for which we want to fetch the scanner.
|
|
|
|
Implies self.has_builder() is true; again, expect to only be
|
|
called from locations where this is already verified.
|
|
|
|
This function may be called very often; it attempts to cache
|
|
the scanner found to improve performance.
|
|
"""
|
|
scanner = None
|
|
try:
|
|
scanner = self.builder.source_scanner
|
|
except AttributeError:
|
|
pass
|
|
if not scanner:
|
|
# The builder didn't have an explicit scanner, so go look up
|
|
# a scanner from env['SCANNERS'] based on the node's scanner
|
|
# key (usually the file extension).
|
|
scanner = self.get_env_scanner(self.get_build_env())
|
|
if scanner:
|
|
scanner = scanner.select(node)
|
|
return scanner
|
|
|
|
def add_to_implicit(self, deps):
|
|
if not hasattr(self, 'implicit') or self.implicit is None:
|
|
self.implicit = []
|
|
self.implicit_set = set()
|
|
self._children_reset()
|
|
self._add_child(self.implicit, self.implicit_set, deps)
|
|
|
|
def scan(self):
|
|
"""Scan this node's dependents for implicit dependencies."""
|
|
# Don't bother scanning non-derived files, because we don't
|
|
# care what their dependencies are.
|
|
# Don't scan again, if we already have scanned.
|
|
if not self.implicit is None:
|
|
return
|
|
self.implicit = []
|
|
self.implicit_set = set()
|
|
self._children_reset()
|
|
if not self.has_builder():
|
|
return
|
|
|
|
build_env = self.get_build_env()
|
|
executor = self.get_executor()
|
|
|
|
# Here's where we implement --implicit-cache.
|
|
if implicit_cache and not implicit_deps_changed:
|
|
implicit = self.get_stored_implicit()
|
|
if implicit is not None:
|
|
# We now add the implicit dependencies returned from the
|
|
# stored .sconsign entry to have already been converted
|
|
# to Nodes for us. (We used to run them through a
|
|
# source_factory function here.)
|
|
|
|
# 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.
|
|
for tgt in executor.targets:
|
|
tgt.add_to_implicit(implicit)
|
|
|
|
if implicit_deps_unchanged or self.is_up_to_date():
|
|
return
|
|
# one of this node's sources has changed,
|
|
# so we must recalculate the implicit deps:
|
|
self.implicit = []
|
|
self.implicit_set = set()
|
|
|
|
# Have the executor scan the sources.
|
|
executor.scan_sources(self.builder.source_scanner)
|
|
|
|
# If there's a target scanner, have the executor scan the target
|
|
# node itself and associated targets that might be built.
|
|
scanner = self.get_target_scanner()
|
|
if scanner:
|
|
executor.scan_targets(scanner)
|
|
|
|
def scanner_key(self):
|
|
return None
|
|
|
|
def select_scanner(self, scanner):
|
|
"""Selects a scanner for this Node.
|
|
|
|
This is a separate method so it can be overridden by Node
|
|
subclasses (specifically, Node.FS.Dir) that *must* use their
|
|
own Scanner and don't select one the Scanner.Selector that's
|
|
configured for the target.
|
|
"""
|
|
return scanner.select(self)
|
|
|
|
def env_set(self, env, safe=0):
|
|
if safe and self.env:
|
|
return
|
|
self.env = env
|
|
|
|
#
|
|
# SIGNATURE SUBSYSTEM
|
|
#
|
|
|
|
NodeInfo = NodeInfoBase
|
|
BuildInfo = BuildInfoBase
|
|
|
|
def new_ninfo(self):
|
|
ninfo = self.NodeInfo(self)
|
|
return ninfo
|
|
|
|
def get_ninfo(self):
|
|
try:
|
|
return self.ninfo
|
|
except AttributeError:
|
|
self.ninfo = self.new_ninfo()
|
|
return self.ninfo
|
|
|
|
def new_binfo(self):
|
|
binfo = self.BuildInfo(self)
|
|
return binfo
|
|
|
|
def get_binfo(self):
|
|
"""
|
|
Fetch a node's build information.
|
|
|
|
node - the node whose sources will be collected
|
|
cache - alternate node to use for the signature cache
|
|
returns - the build signature
|
|
|
|
This no longer handles the recursive descent of the
|
|
node's children's signatures. We expect that they're
|
|
already built and updated by someone else, if that's
|
|
what's wanted.
|
|
"""
|
|
try:
|
|
return self.binfo
|
|
except AttributeError:
|
|
pass
|
|
|
|
binfo = self.new_binfo()
|
|
self.binfo = binfo
|
|
|
|
executor = self.get_executor()
|
|
ignore_set = self.ignore_set
|
|
|
|
if self.has_builder():
|
|
binfo.bact = str(executor)
|
|
binfo.bactsig = SCons.Util.MD5signature(executor.get_contents())
|
|
|
|
if self._specific_sources:
|
|
sources = []
|
|
for s in self.sources:
|
|
if s not in ignore_set:
|
|
sources.append(s)
|
|
else:
|
|
sources = executor.get_unignored_sources(self.ignore)
|
|
seen = set()
|
|
bsources = []
|
|
bsourcesigs = []
|
|
for s in sources:
|
|
if not s in seen:
|
|
seen.add(s)
|
|
bsources.append(s)
|
|
bsourcesigs.append(s.get_ninfo())
|
|
binfo.bsources = bsources
|
|
binfo.bsourcesigs = bsourcesigs
|
|
|
|
depends = self.depends
|
|
dependsigs = []
|
|
for d in depends:
|
|
if d not in ignore_set:
|
|
dependsigs.append(d.get_ninfo())
|
|
binfo.bdepends = depends
|
|
binfo.bdependsigs = dependsigs
|
|
|
|
implicit = self.implicit or []
|
|
implicitsigs = []
|
|
for i in implicit:
|
|
if i not in ignore_set:
|
|
implicitsigs.append(i.get_ninfo())
|
|
binfo.bimplicit = implicit
|
|
binfo.bimplicitsigs = implicitsigs
|
|
|
|
return binfo
|
|
|
|
def del_binfo(self):
|
|
"""Delete the build info from this node."""
|
|
try:
|
|
delattr(self, 'binfo')
|
|
except AttributeError:
|
|
pass
|
|
|
|
def get_csig(self):
|
|
try:
|
|
return self.ninfo.csig
|
|
except AttributeError:
|
|
ninfo = self.get_ninfo()
|
|
ninfo.csig = SCons.Util.MD5signature(self.get_contents())
|
|
return self.ninfo.csig
|
|
|
|
def get_cachedir_csig(self):
|
|
return self.get_csig()
|
|
|
|
def store_info(self):
|
|
"""Make the build signature permanent (that is, store it in the
|
|
.sconsign file or equivalent)."""
|
|
pass
|
|
|
|
def do_not_store_info(self):
|
|
pass
|
|
|
|
def get_stored_info(self):
|
|
return None
|
|
|
|
def get_stored_implicit(self):
|
|
"""Fetch the stored implicit dependencies"""
|
|
return None
|
|
|
|
#
|
|
#
|
|
#
|
|
|
|
def set_precious(self, precious = 1):
|
|
"""Set the Node's precious value."""
|
|
self.precious = precious
|
|
|
|
def set_noclean(self, noclean = 1):
|
|
"""Set the Node's noclean value."""
|
|
# Make sure noclean is an integer so the --debug=stree
|
|
# output in Util.py can use it as an index.
|
|
self.noclean = noclean and 1 or 0
|
|
|
|
def set_nocache(self, nocache = 1):
|
|
"""Set the Node's nocache value."""
|
|
# Make sure nocache is an integer so the --debug=stree
|
|
# output in Util.py can use it as an index.
|
|
self.nocache = nocache and 1 or 0
|
|
|
|
def set_always_build(self, always_build = 1):
|
|
"""Set the Node's always_build value."""
|
|
self.always_build = always_build
|
|
|
|
def exists(self):
|
|
"""Does this node exists?"""
|
|
# All node exist by default:
|
|
return 1
|
|
|
|
def rexists(self):
|
|
"""Does this node exist locally or in a repositiory?"""
|
|
# There are no repositories by default:
|
|
return self.exists()
|
|
|
|
def missing(self):
|
|
return not self.is_derived() and \
|
|
not self.linked and \
|
|
not self.rexists()
|
|
|
|
def remove(self):
|
|
"""Remove this Node: no-op by default."""
|
|
return None
|
|
|
|
def add_dependency(self, depend):
|
|
"""Adds dependencies."""
|
|
try:
|
|
self._add_child(self.depends, self.depends_set, depend)
|
|
except TypeError, e:
|
|
e = e.args[0]
|
|
if SCons.Util.is_List(e):
|
|
s = map(str, e)
|
|
else:
|
|
s = str(e)
|
|
raise SCons.Errors.UserError("attempted to add a non-Node dependency to %s:\n\t%s is a %s, not a Node" % (str(self), s, type(e)))
|
|
|
|
def add_prerequisite(self, prerequisite):
|
|
"""Adds prerequisites"""
|
|
self.prerequisites.extend(prerequisite)
|
|
self._children_reset()
|
|
|
|
def add_ignore(self, depend):
|
|
"""Adds dependencies to ignore."""
|
|
try:
|
|
self._add_child(self.ignore, self.ignore_set, depend)
|
|
except TypeError, e:
|
|
e = e.args[0]
|
|
if SCons.Util.is_List(e):
|
|
s = map(str, e)
|
|
else:
|
|
s = str(e)
|
|
raise SCons.Errors.UserError("attempted to ignore a non-Node dependency of %s:\n\t%s is a %s, not a Node" % (str(self), s, type(e)))
|
|
|
|
def add_source(self, source):
|
|
"""Adds sources."""
|
|
if self._specific_sources:
|
|
return
|
|
try:
|
|
self._add_child(self.sources, self.sources_set, source)
|
|
except TypeError, e:
|
|
e = e.args[0]
|
|
if SCons.Util.is_List(e):
|
|
s = map(str, e)
|
|
else:
|
|
s = str(e)
|
|
raise SCons.Errors.UserError("attempted to add a non-Node as source of %s:\n\t%s is a %s, not a Node" % (str(self), s, type(e)))
|
|
|
|
def _add_child(self, collection, set, child):
|
|
"""Adds 'child' to 'collection', first checking 'set' to see if it's
|
|
already present."""
|
|
#if type(child) is not type([]):
|
|
# child = [child]
|
|
#for c in child:
|
|
# if not isinstance(c, Node):
|
|
# raise TypeError, c
|
|
added = None
|
|
for c in child:
|
|
if c not in set:
|
|
set.add(c)
|
|
collection.append(c)
|
|
added = 1
|
|
if added:
|
|
self._children_reset()
|
|
|
|
def set_specific_source(self, source):
|
|
self.add_source(source)
|
|
self._specific_sources = True
|
|
|
|
def add_wkid(self, wkid):
|
|
"""Add a node to the list of kids waiting to be evaluated"""
|
|
if self.wkids != None:
|
|
self.wkids.append(wkid)
|
|
|
|
def _children_reset(self):
|
|
self.clear_memoized_values()
|
|
# We need to let the Executor clear out any calculated
|
|
# build info that it's cached so we can re-calculate it.
|
|
self.executor_cleanup()
|
|
|
|
memoizer_counters.append(SCons.Memoize.CountValue('_children_get'))
|
|
|
|
def _children_get(self):
|
|
try:
|
|
return self._memo['children_get']
|
|
except KeyError:
|
|
pass
|
|
|
|
# The return list may contain duplicate Nodes, especially in
|
|
# source trees where there are a lot of repeated #includes
|
|
# of a tangle of .h files. Profiling shows, however, that
|
|
# eliminating the duplicates with a brute-force approach that
|
|
# preserves the order (that is, something like:
|
|
#
|
|
# u = []
|
|
# for n in list:
|
|
# if n not in u:
|
|
# u.append(n)"
|
|
#
|
|
# takes more cycles than just letting the underlying methods
|
|
# hand back cached values if a Node's information is requested
|
|
# multiple times. (Other methods of removing duplicates, like
|
|
# using dictionary keys, lose the order, and the only ordered
|
|
# dictionary patterns I found all ended up using "not in"
|
|
# internally anyway...)
|
|
if self.ignore_set:
|
|
if self.implicit is None:
|
|
iter = chain(self.sources,self.depends)
|
|
else:
|
|
iter = chain(self.sources, self.depends, self.implicit)
|
|
|
|
children = []
|
|
for i in iter:
|
|
if i not in self.ignore_set:
|
|
children.append(i)
|
|
else:
|
|
if self.implicit is None:
|
|
children = self.sources + self.depends
|
|
else:
|
|
children = self.sources + self.depends + self.implicit
|
|
|
|
self._memo['children_get'] = children
|
|
return children
|
|
|
|
def all_children(self, scan=1):
|
|
"""Return a list of all the node's direct children."""
|
|
if scan:
|
|
self.scan()
|
|
|
|
# The return list may contain duplicate Nodes, especially in
|
|
# source trees where there are a lot of repeated #includes
|
|
# of a tangle of .h files. Profiling shows, however, that
|
|
# eliminating the duplicates with a brute-force approach that
|
|
# preserves the order (that is, something like:
|
|
#
|
|
# u = []
|
|
# for n in list:
|
|
# if n not in u:
|
|
# u.append(n)"
|
|
#
|
|
# takes more cycles than just letting the underlying methods
|
|
# hand back cached values if a Node's information is requested
|
|
# multiple times. (Other methods of removing duplicates, like
|
|
# using dictionary keys, lose the order, and the only ordered
|
|
# dictionary patterns I found all ended up using "not in"
|
|
# internally anyway...)
|
|
if self.implicit is None:
|
|
return self.sources + self.depends
|
|
else:
|
|
return self.sources + self.depends + self.implicit
|
|
|
|
def children(self, scan=1):
|
|
"""Return a list of the node's direct children, minus those
|
|
that are ignored by this node."""
|
|
if scan:
|
|
self.scan()
|
|
return self._children_get()
|
|
|
|
def set_state(self, state):
|
|
self.state = state
|
|
|
|
def get_state(self):
|
|
return self.state
|
|
|
|
def state_has_changed(self, target, prev_ni):
|
|
return (self.state != SCons.Node.up_to_date)
|
|
|
|
def get_env(self):
|
|
env = self.env
|
|
if not env:
|
|
import SCons.Defaults
|
|
env = SCons.Defaults.DefaultEnvironment()
|
|
return env
|
|
|
|
def changed_since_last_build(self, target, prev_ni):
|
|
"""
|
|
|
|
Must be overridden in a specific subclass to return True if this
|
|
Node (a dependency) has changed since the last time it was used
|
|
to build the specified target. prev_ni is this Node's state (for
|
|
example, its file timestamp, length, maybe content signature)
|
|
as of the last time the target was built.
|
|
|
|
Note that this method is called through the dependency, not the
|
|
target, because a dependency Node must be able to use its own
|
|
logic to decide if it changed. For example, File Nodes need to
|
|
obey if we're configured to use timestamps, but Python Value Nodes
|
|
never use timestamps and always use the content. If this method
|
|
were called through the target, then each Node's implementation
|
|
of this method would have to have more complicated logic to
|
|
handle all the different Node types on which it might depend.
|
|
"""
|
|
raise NotImplementedError
|
|
|
|
def Decider(self, function):
|
|
SCons.Util.AddMethod(self, function, 'changed_since_last_build')
|
|
|
|
def changed(self, node=None):
|
|
"""
|
|
Returns if the node is up-to-date with respect to the BuildInfo
|
|
stored last time it was built. The default behavior is to compare
|
|
it against our own previously stored BuildInfo, but the stored
|
|
BuildInfo from another Node (typically one in a Repository)
|
|
can be used instead.
|
|
|
|
Note that we now *always* check every dependency. We used to
|
|
short-circuit the check by returning as soon as we detected
|
|
any difference, but we now rely on checking every dependency
|
|
to make sure that any necessary Node information (for example,
|
|
the content signature of an #included .h file) is updated.
|
|
"""
|
|
t = 0
|
|
if t: Trace('changed(%s [%s], %s)' % (self, classname(self), node))
|
|
if node is None:
|
|
node = self
|
|
|
|
result = False
|
|
|
|
bi = node.get_stored_info().binfo
|
|
then = bi.bsourcesigs + bi.bdependsigs + bi.bimplicitsigs
|
|
children = self.children()
|
|
|
|
diff = len(children) - len(then)
|
|
if diff:
|
|
# The old and new dependency lists are different lengths.
|
|
# This always indicates that the Node must be rebuilt.
|
|
# We also extend the old dependency list with enough None
|
|
# entries to equal the new dependency list, for the benefit
|
|
# of the loop below that updates node information.
|
|
then.extend([None] * diff)
|
|
if t: Trace(': old %s new %s' % (len(then), len(children)))
|
|
result = True
|
|
|
|
for child, prev_ni in izip(children, then):
|
|
if child.changed_since_last_build(self, prev_ni):
|
|
if t: Trace(': %s changed' % child)
|
|
result = True
|
|
|
|
contents = self.get_executor().get_contents()
|
|
if self.has_builder():
|
|
import SCons.Util
|
|
newsig = SCons.Util.MD5signature(contents)
|
|
if bi.bactsig != newsig:
|
|
if t: Trace(': bactsig %s != newsig %s' % (bi.bactsig, newsig))
|
|
result = True
|
|
|
|
if not result:
|
|
if t: Trace(': up to date')
|
|
|
|
if t: Trace('\n')
|
|
|
|
return result
|
|
|
|
def is_up_to_date(self):
|
|
"""Default check for whether the Node is current: unknown Node
|
|
subtypes are always out of date, so they will always get built."""
|
|
return None
|
|
|
|
def children_are_up_to_date(self):
|
|
"""Alternate check for whether the Node is current: If all of
|
|
our children were up-to-date, then this Node was up-to-date, too.
|
|
|
|
The SCons.Node.Alias and SCons.Node.Python.Value subclasses
|
|
rebind their current() method to this method."""
|
|
# Allow the children to calculate their signatures.
|
|
self.binfo = self.get_binfo()
|
|
if self.always_build:
|
|
return None
|
|
state = 0
|
|
for kid in self.children(None):
|
|
s = kid.get_state()
|
|
if s and (not state or s > state):
|
|
state = s
|
|
return (state == 0 or state == SCons.Node.up_to_date)
|
|
|
|
def is_literal(self):
|
|
"""Always pass the string representation of a Node to
|
|
the command interpreter literally."""
|
|
return 1
|
|
|
|
def render_include_tree(self):
|
|
"""
|
|
Return a text representation, suitable for displaying to the
|
|
user, of the include tree for the sources of this node.
|
|
"""
|
|
if self.is_derived() and self.env:
|
|
env = self.get_build_env()
|
|
for s in self.sources:
|
|
scanner = self.get_source_scanner(s)
|
|
if scanner:
|
|
path = self.get_build_scanner_path(scanner)
|
|
else:
|
|
path = None
|
|
def f(node, env=env, scanner=scanner, path=path):
|
|
return node.get_found_includes(env, scanner, path)
|
|
return SCons.Util.render_tree(s, f, 1)
|
|
else:
|
|
return None
|
|
|
|
def get_abspath(self):
|
|
"""
|
|
Return an absolute path to the Node. This will return simply
|
|
str(Node) by default, but for Node types that have a concept of
|
|
relative path, this might return something different.
|
|
"""
|
|
return str(self)
|
|
|
|
def for_signature(self):
|
|
"""
|
|
Return a string representation of the Node that will always
|
|
be the same for this particular Node, no matter what. This
|
|
is by contrast to the __str__() method, which might, for
|
|
instance, return a relative path for a file Node. The purpose
|
|
of this method is to generate a value to be used in signature
|
|
calculation for the command line used to build a target, and
|
|
we use this method instead of str() to avoid unnecessary
|
|
rebuilds. This method does not need to return something that
|
|
would actually work in a command line; it can return any kind of
|
|
nonsense, so long as it does not change.
|
|
"""
|
|
return str(self)
|
|
|
|
def get_string(self, for_signature):
|
|
"""This is a convenience function designed primarily to be
|
|
used in command generators (i.e., CommandGeneratorActions or
|
|
Environment variables that are callable), which are called
|
|
with a for_signature argument that is nonzero if the command
|
|
generator is being called to generate a signature for the
|
|
command line, which determines if we should rebuild or not.
|
|
|
|
Such command generators should use this method in preference
|
|
to str(Node) when converting a Node to a string, passing
|
|
in the for_signature parameter, such that we will call
|
|
Node.for_signature() or str(Node) properly, depending on whether
|
|
we are calculating a signature or actually constructing a
|
|
command line."""
|
|
if for_signature:
|
|
return self.for_signature()
|
|
return str(self)
|
|
|
|
def get_subst_proxy(self):
|
|
"""
|
|
This method is expected to return an object that will function
|
|
exactly like this Node, except that it implements any additional
|
|
special features that we would like to be in effect for
|
|
Environment variable substitution. The principle use is that
|
|
some Nodes would like to implement a __getattr__() method,
|
|
but putting that in the Node type itself has a tendency to kill
|
|
performance. We instead put it in a proxy and return it from
|
|
this method. It is legal for this method to return self
|
|
if no new functionality is needed for Environment substitution.
|
|
"""
|
|
return self
|
|
|
|
def explain(self):
|
|
if not self.exists():
|
|
return "building `%s' because it doesn't exist\n" % self
|
|
|
|
if self.always_build:
|
|
return "rebuilding `%s' because AlwaysBuild() is specified\n" % self
|
|
|
|
old = self.get_stored_info()
|
|
if old is None:
|
|
return None
|
|
|
|
old = old.binfo
|
|
old.prepare_dependencies()
|
|
|
|
try:
|
|
old_bkids = old.bsources + old.bdepends + old.bimplicit
|
|
old_bkidsigs = old.bsourcesigs + old.bdependsigs + old.bimplicitsigs
|
|
except AttributeError:
|
|
return "Cannot explain why `%s' is being rebuilt: No previous build information found\n" % self
|
|
|
|
new = self.get_binfo()
|
|
|
|
new_bkids = new.bsources + new.bdepends + new.bimplicit
|
|
new_bkidsigs = new.bsourcesigs + new.bdependsigs + new.bimplicitsigs
|
|
|
|
osig = dict(izip(old_bkids, old_bkidsigs))
|
|
nsig = dict(izip(new_bkids, new_bkidsigs))
|
|
|
|
# The sources and dependencies we'll want to report are all stored
|
|
# as relative paths to this target's directory, but we want to
|
|
# report them relative to the top-level SConstruct directory,
|
|
# so we only print them after running them through this lambda
|
|
# to turn them into the right relative Node and then return
|
|
# its string.
|
|
def stringify( s, E=self.dir.Entry ) :
|
|
if hasattr( s, 'dir' ) :
|
|
return str(E(s))
|
|
return str(s)
|
|
|
|
lines = []
|
|
|
|
removed = filter(lambda x, nk=new_bkids: not x in nk, old_bkids)
|
|
if removed:
|
|
removed = map(stringify, removed)
|
|
fmt = "`%s' is no longer a dependency\n"
|
|
lines.extend(map(lambda s, fmt=fmt: fmt % s, removed))
|
|
|
|
for k in new_bkids:
|
|
if not k in old_bkids:
|
|
lines.append("`%s' is a new dependency\n" % stringify(k))
|
|
elif k.changed_since_last_build(self, osig[k]):
|
|
lines.append("`%s' changed\n" % stringify(k))
|
|
|
|
if len(lines) == 0 and old_bkids != new_bkids:
|
|
lines.append("the dependency order changed:\n" +
|
|
"%sold: %s\n" % (' '*15, map(stringify, old_bkids)) +
|
|
"%snew: %s\n" % (' '*15, map(stringify, new_bkids)))
|
|
|
|
if len(lines) == 0:
|
|
def fmt_with_title(title, strlines):
|
|
lines = string.split(strlines, '\n')
|
|
sep = '\n' + ' '*(15 + len(title))
|
|
return ' '*15 + title + string.join(lines, sep) + '\n'
|
|
if old.bactsig != new.bactsig:
|
|
if old.bact == new.bact:
|
|
lines.append("the contents of the build action changed\n" +
|
|
fmt_with_title('action: ', new.bact))
|
|
else:
|
|
lines.append("the build action changed:\n" +
|
|
fmt_with_title('old: ', old.bact) +
|
|
fmt_with_title('new: ', new.bact))
|
|
|
|
if len(lines) == 0:
|
|
return "rebuilding `%s' for unknown reasons\n" % self
|
|
|
|
preamble = "rebuilding `%s' because" % self
|
|
if len(lines) == 1:
|
|
return "%s %s" % (preamble, lines[0])
|
|
else:
|
|
lines = ["%s:\n" % preamble] + lines
|
|
return string.join(lines, ' '*11)
|
|
|
|
try:
|
|
[].extend(UserList.UserList([]))
|
|
except TypeError:
|
|
# Python 1.5.2 doesn't allow a list to be extended by list-like
|
|
# objects (such as UserList instances), so just punt and use
|
|
# real lists.
|
|
def NodeList(l):
|
|
return l
|
|
else:
|
|
class NodeList(UserList.UserList):
|
|
def __str__(self):
|
|
return str(map(str, self.data))
|
|
|
|
def get_children(node, parent): return node.children()
|
|
def ignore_cycle(node, stack): pass
|
|
def do_nothing(node, parent): pass
|
|
|
|
class Walker:
|
|
"""An iterator for walking a Node tree.
|
|
|
|
This is depth-first, children are visited before the parent.
|
|
The Walker object can be initialized with any node, and
|
|
returns the next node on the descent with each next() call.
|
|
'kids_func' is an optional function that will be called to
|
|
get the children of a node instead of calling 'children'.
|
|
'cycle_func' is an optional function that will be called
|
|
when a cycle is detected.
|
|
|
|
This class does not get caught in node cycles caused, for example,
|
|
by C header file include loops.
|
|
"""
|
|
def __init__(self, node, kids_func=get_children,
|
|
cycle_func=ignore_cycle,
|
|
eval_func=do_nothing):
|
|
self.kids_func = kids_func
|
|
self.cycle_func = cycle_func
|
|
self.eval_func = eval_func
|
|
node.wkids = copy.copy(kids_func(node, None))
|
|
self.stack = [node]
|
|
self.history = {} # used to efficiently detect and avoid cycles
|
|
self.history[node] = None
|
|
|
|
def next(self):
|
|
"""Return the next node for this walk of the tree.
|
|
|
|
This function is intentionally iterative, not recursive,
|
|
to sidestep any issues of stack size limitations.
|
|
"""
|
|
|
|
while self.stack:
|
|
if self.stack[-1].wkids:
|
|
node = self.stack[-1].wkids.pop(0)
|
|
if not self.stack[-1].wkids:
|
|
self.stack[-1].wkids = None
|
|
if self.history.has_key(node):
|
|
self.cycle_func(node, self.stack)
|
|
else:
|
|
node.wkids = copy.copy(self.kids_func(node, self.stack[-1]))
|
|
self.stack.append(node)
|
|
self.history[node] = None
|
|
else:
|
|
node = self.stack.pop()
|
|
del self.history[node]
|
|
if node:
|
|
if self.stack:
|
|
parent = self.stack[-1]
|
|
else:
|
|
parent = None
|
|
self.eval_func(node, parent)
|
|
return node
|
|
return None
|
|
|
|
def is_done(self):
|
|
return not self.stack
|
|
|
|
|
|
arg2nodes_lookups = []
|
|
|