1 """SCons.Node
2
3 The Node package for the SCons software construction utility.
4
5 This is, in many ways, the heart of SCons.
6
7 A Node is where we encapsulate all of the dependency information about
8 any thing that SCons can build, or about any thing which SCons can use
9 to build some other thing. The canonical "thing," of course, is a file,
10 but a Node can also represent something remote (like a web page) or
11 something completely abstract (like an Alias).
12
13 Each specific type of "thing" is specifically represented by a subclass
14 of the Node base class: Node.FS.File for files, Node.Alias for aliases,
15 etc. Dependency information is kept here in the base class, and
16 information specific to files/aliases/etc. is in the subclass. The
17 goal, if we've done this correctly, is that any type of "thing" should
18 be able to depend on any other type of "thing."
19
20 """
21
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44
45 __revision__ = "src/engine/SCons/Node/__init__.py 3266 2008/08/12 07:31:01 knight"
46
47 import SCons.compat
48
49 import copy
50 from itertools import chain, izip
51 import string
52 import UserList
53
54 from SCons.Debug import logInstanceCreation
55 import SCons.Executor
56 import SCons.Memoize
57 import SCons.Util
58
59 from SCons.Debug import Trace
60
63
64
65
66
67
68
69
70
71 no_state = 0
72 pending = 1
73 executing = 2
74 up_to_date = 3
75 executed = 4
76 failed = 5
77
78 StateString = {
79 0 : "no_state",
80 1 : "pending",
81 2 : "executing",
82 3 : "up_to_date",
83 4 : "executed",
84 5 : "failed",
85 }
86
87
88 implicit_cache = 0
89
90
91 implicit_deps_unchanged = 0
92
93
94 implicit_deps_changed = 0
95
96
97
99
100 Annotate = do_nothing
101
102
103
105 """
106 The generic base class for signature information for a Node.
107
108 Node subclasses should subclass NodeInfoBase to provide their own
109 logic for dealing with their own Node-specific signature information.
110 """
111 current_version_id = 1
117 try:
118 field_list = self.field_list
119 except AttributeError:
120 return
121 for f in field_list:
122 try:
123 delattr(self, f)
124 except AttributeError:
125 pass
126 try:
127 func = getattr(node, 'get_' + f)
128 except AttributeError:
129 pass
130 else:
131 setattr(self, f, func())
135 self.__dict__.update(other.__dict__)
154
156 """
157 The generic base class for build information for a Node.
158
159 This is what gets stored in a .sconsign file for each target file.
160 It contains a NodeInfo instance for this node (signature information
161 that's specific to the type of Node) and direct attributes for the
162 generic build stuff we have to track: sources, explicit dependencies,
163 implicit dependencies, and action information.
164 """
165 current_version_id = 1
167
168
169 self._version_id = self.current_version_id
170 self.bsourcesigs = []
171 self.bdependsigs = []
172 self.bimplicitsigs = []
173 self.bactsig = None
175 self.__dict__.update(other.__dict__)
176
178 """The base Node class, for entities that we know how to
179 build, or use to build other Nodes.
180 """
181
182 if SCons.Memoize.use_memoizer:
183 __metaclass__ = SCons.Memoize.Memoized_Metaclass
184
185 memoizer_counters = []
186
189
191 if __debug__: logInstanceCreation(self, 'Node.Node')
192
193
194
195
196
197
198
199
200
201
202
203
204
205 self.sources = []
206 self.sources_set = set()
207 self._specific_sources = False
208 self.depends = []
209 self.depends_set = set()
210 self.ignore = []
211 self.ignore_set = set()
212 self.prerequisites = SCons.Util.UniqueList()
213 self.implicit = None
214 self.waiting_parents = set()
215 self.waiting_s_e = set()
216 self.ref_count = 0
217 self.wkids = None
218
219 self.env = None
220 self.state = no_state
221 self.precious = None
222 self.noclean = 0
223 self.nocache = 0
224 self.always_build = None
225 self.includes = None
226 self.attributes = self.Attrs()
227 self.side_effect = 0
228 self.side_effects = []
229 self.linked = 0
230
231 self.clear_memoized_values()
232
233
234
235
236 Annotate(self)
237
240
243
244 memoizer_counters.append(SCons.Memoize.CountValue('get_build_env'))
245
247 """Fetch the appropriate Environment to build this node.
248 """
249 try:
250 return self._memo['get_build_env']
251 except KeyError:
252 pass
253 result = self.get_executor().get_build_env()
254 self._memo['get_build_env'] = result
255 return result
256
260
262 """Set the action executor for this node."""
263 self.executor = executor
264
266 """Fetch the action executor for this node. Create one if
267 there isn't already one, and requested to do so."""
268 try:
269 executor = self.executor
270 except AttributeError:
271 if not create:
272 raise
273 try:
274 act = self.builder.action
275 except AttributeError:
276 executor = SCons.Executor.Null(targets=[self])
277 else:
278 executor = SCons.Executor.Executor(act,
279 self.env or self.builder.env,
280 [self.builder.overrides],
281 [self],
282 self.sources)
283 self.executor = executor
284 return executor
285
287 """Let the executor clean up any cached information."""
288 try:
289 executor = self.get_executor(create=None)
290 except AttributeError:
291 pass
292 else:
293 executor.cleanup()
294
296 "Remove cached executor; forces recompute when needed."
297 try:
298 delattr(self, 'executor')
299 except AttributeError:
300 pass
301
303 """Try to retrieve the node's content from a cache
304
305 This method is called from multiple threads in a parallel build,
306 so only do thread safe stuff here. Do thread unsafe stuff in
307 built().
308
309 Returns true iff the node was successfully retrieved.
310 """
311 return 0
312
313
314
315
316
318 """Get a Node ready for evaluation.
319
320 This is called before the Taskmaster decides if the Node is
321 up-to-date or not. Overriding this method allows for a Node
322 subclass to be disambiguated if necessary, or for an implicit
323 source builder to be attached.
324 """
325 pass
326
328 """Prepare for this Node to be built.
329
330 This is called after the Taskmaster has decided that the Node
331 is out-of-date and must be rebuilt, but before actually calling
332 the method to build the Node.
333
334 This default implementation checks that explicit or implicit
335 dependencies either exist or are derived, and initializes the
336 BuildInfo structure that will hold the information about how
337 this node is, uh, built.
338
339 (The existence of source files is checked separately by the
340 Executor, which aggregates checks for all of the targets built
341 by a specific action.)
342
343 Overriding this method allows for for a Node subclass to remove
344 the underlying file from the file system. Note that subclass
345 methods should call this base class method to get the child
346 check and the BuildInfo structure.
347 """
348 for d in self.depends:
349 if d.missing():
350 msg = "Explicit dependency `%s' not found, needed by target `%s'."
351 raise SCons.Errors.StopError, msg % (d, self)
352 if not self.implicit is None:
353 for i in self.implicit:
354 if i.missing():
355 msg = "Implicit dependency `%s' not found, needed by target `%s'."
356 raise SCons.Errors.StopError, msg % (i, self)
357 self.binfo = self.get_binfo()
358
360 """Actually build the node.
361
362 This is called by the Taskmaster after it's decided that the
363 Node is out-of-date and must be rebuilt, and after the prepare()
364 method has gotten everything, uh, prepared.
365
366 This method is called from multiple threads in a parallel build,
367 so only do thread safe stuff here. Do thread unsafe stuff
368 in built().
369
370 """
371 try:
372 apply(self.get_executor(), (self,), kw)
373 except SCons.Errors.BuildError, e:
374 e.node = self
375 raise
376
378 """Called just after this node is successfully built."""
379
380
381
382 for parent in self.waiting_parents:
383 parent.implicit = None
384
385 self.clear()
386
387 self.ninfo.update(self)
388
390 """Called just after this node has been visited (with or
391 without a build)."""
392 try:
393 binfo = self.binfo
394 except AttributeError:
395
396
397 pass
398 else:
399 self.ninfo.update(self)
400 self.store_info()
401
402
403
404
405
407 self.waiting_s_e.add(node)
408
410 """
411 Returns the number of nodes added to our waiting parents list:
412 1 if we add a unique waiting parent, 0 if not. (Note that the
413 returned values are intended to be used to increment a reference
414 count, so don't think you can "clean up" this function by using
415 True and False instead...)
416 """
417 wp = self.waiting_parents
418 if node in wp:
419 return 0
420 wp.add(node)
421 return 1
422
423 - def postprocess(self):
424 """Clean up anything we don't need to hang onto after we've
425 been built."""
426 self.executor_cleanup()
427 self.waiting_parents = set()
428
430 """Completely clear a Node of all its cached state (so that it
431 can be re-evaluated by interfaces that do continuous integration
432 builds).
433 """
434
435
436
437 self.del_binfo()
438 self.clear_memoized_values()
439 self.ninfo = self.new_ninfo()
440 self.executor_cleanup()
441 try:
442 delattr(self, '_calculated_sig')
443 except AttributeError:
444 pass
445 self.includes = None
446
449
451 self.builder = builder
452 try:
453 del self.executor
454 except AttributeError:
455 pass
456
458 """Return whether this Node has a builder or not.
459
460 In Boolean tests, this turns out to be a *lot* more efficient
461 than simply examining the builder attribute directly ("if
462 node.builder: ..."). When the builder attribute is examined
463 directly, it ends up calling __getattr__ for both the __len__
464 and __nonzero__ attributes on instances of our Builder Proxy
465 class(es), generating a bazillion extra calls and slowing
466 things down immensely.
467 """
468 try:
469 b = self.builder
470 except AttributeError:
471
472
473 b = self.builder = None
474 return not b is None
475
477 self.is_explicit = is_explicit
478
480 """Return whether this Node has an explicit builder
481
482 This allows an internal Builder created by SCons to be marked
483 non-explicit, so that it can be overridden by an explicit
484 builder that the user supplies (the canonical example being
485 directories)."""
486 try:
487 return self.is_explicit
488 except AttributeError:
489 self.is_explicit = None
490 return self.is_explicit
491
493 """Return the set builder, or a specified default value"""
494 try:
495 return self.builder
496 except AttributeError:
497 return default_builder
498
499 multiple_side_effect_has_builder = has_builder
500
502 """
503 Returns true iff this node is derived (i.e. built).
504
505 This should return true only for nodes whose path should be in
506 the variant directory when duplicate=0 and should contribute their build
507 signatures when they are used as source files to other derived files. For
508 example: source with source builders are not derived in this sense,
509 and hence should not return true.
510 """
511 return self.has_builder() or self.side_effect
512
514 """Return a list of alternate targets for this Node.
515 """
516 return [], None
517
519 """Return the scanned include lines (implicit dependencies)
520 found in this node.
521
522 The default is no implicit dependencies. We expect this method
523 to be overridden by any subclass that can be scanned for
524 implicit dependencies.
525 """
526 return []
527
529 """Return a list of implicit dependencies for this node.
530
531 This method exists to handle recursive invocation of the scanner
532 on the implicit dependencies returned by the scanner, if the
533 scanner's recursive flag says that we should.
534 """
535 if not scanner:
536 return []
537
538
539
540
541
542 nodes = [self]
543 seen = {}
544 seen[self] = 1
545 deps = []
546 while nodes:
547 n = nodes.pop(0)
548 d = filter(lambda x, seen=seen: not seen.has_key(x),
549 n.get_found_includes(env, scanner, path))
550 if d:
551 deps.extend(d)
552 for n in d:
553 seen[n] = 1
554 nodes.extend(scanner.recurse_nodes(d))
555
556 return deps
557
560
562 return self.builder.target_scanner
563
565 """Fetch the source scanner for the specified node
566
567 NOTE: "self" is the target being built, "node" is
568 the source file for which we want to fetch the scanner.
569
570 Implies self.has_builder() is true; again, expect to only be
571 called from locations where this is already verified.
572
573 This function may be called very often; it attempts to cache
574 the scanner found to improve performance.
575 """
576 scanner = None
577 try:
578 scanner = self.builder.source_scanner
579 except AttributeError:
580 pass
581 if not scanner:
582
583
584
585 scanner = self.get_env_scanner(self.get_build_env())
586 if scanner:
587 scanner = scanner.select(node)
588 return scanner
589
591 if not hasattr(self, 'implicit') or self.implicit is None:
592 self.implicit = []
593 self.implicit_set = set()
594 self._children_reset()
595 self._add_child(self.implicit, self.implicit_set, deps)
596
644
647
649 """Selects a scanner for this Node.
650
651 This is a separate method so it can be overridden by Node
652 subclasses (specifically, Node.FS.Dir) that *must* use their
653 own Scanner and don't select one the Scanner.Selector that's
654 configured for the target.
655 """
656 return scanner.select(self)
657
659 if safe and self.env:
660 return
661 self.env = env
662
663
664
665
666
667 NodeInfo = NodeInfoBase
668 BuildInfo = BuildInfoBase
669
671 ninfo = self.NodeInfo(self)
672 return ninfo
673
675 try:
676 return self.ninfo
677 except AttributeError:
678 self.ninfo = self.new_ninfo()
679 return self.ninfo
680
682 binfo = self.BuildInfo(self)
683 return binfo
684
686 """
687 Fetch a node's build information.
688
689 node - the node whose sources will be collected
690 cache - alternate node to use for the signature cache
691 returns - the build signature
692
693 This no longer handles the recursive descent of the
694 node's children's signatures. We expect that they're
695 already built and updated by someone else, if that's
696 what's wanted.
697 """
698 try:
699 return self.binfo
700 except AttributeError:
701 pass
702
703 binfo = self.new_binfo()
704 self.binfo = binfo
705
706 executor = self.get_executor()
707 ignore_set = self.ignore_set
708
709 if self.has_builder():
710 binfo.bact = str(executor)
711 binfo.bactsig = SCons.Util.MD5signature(executor.get_contents())
712
713 if self._specific_sources:
714 sources = []
715 for s in self.sources:
716 if s not in ignore_set:
717 sources.append(s)
718 else:
719 sources = executor.get_unignored_sources(self.ignore)
720 seen = set()
721 bsources = []
722 bsourcesigs = []
723 for s in sources:
724 if not s in seen:
725 seen.add(s)
726 bsources.append(s)
727 bsourcesigs.append(s.get_ninfo())
728 binfo.bsources = bsources
729 binfo.bsourcesigs = bsourcesigs
730
731 depends = self.depends
732 dependsigs = []
733 for d in depends:
734 if d not in ignore_set:
735 dependsigs.append(d.get_ninfo())
736 binfo.bdepends = depends
737 binfo.bdependsigs = dependsigs
738
739 implicit = self.implicit or []
740 implicitsigs = []
741 for i in implicit:
742 if i not in ignore_set:
743 implicitsigs.append(i.get_ninfo())
744 binfo.bimplicit = implicit
745 binfo.bimplicitsigs = implicitsigs
746
747 return binfo
748
750 """Delete the build info from this node."""
751 try:
752 delattr(self, 'binfo')
753 except AttributeError:
754 pass
755
757 try:
758 return self.ninfo.csig
759 except AttributeError:
760 ninfo = self.get_ninfo()
761 ninfo.csig = SCons.Util.MD5signature(self.get_contents())
762 return self.ninfo.csig
763
766
768 """Make the build signature permanent (that is, store it in the
769 .sconsign file or equivalent)."""
770 pass
771
774
777
779 """Fetch the stored implicit dependencies"""
780 return None
781
782
783
784
785
787 """Set the Node's precious value."""
788 self.precious = precious
789
791 """Set the Node's noclean value."""
792
793
794 self.noclean = noclean and 1 or 0
795
797 """Set the Node's nocache value."""
798
799
800 self.nocache = nocache and 1 or 0
801
803 """Set the Node's always_build value."""
804 self.always_build = always_build
805
807 """Does this node exists?"""
808
809 return 1
810
812 """Does this node exist locally or in a repositiory?"""
813
814 return self.exists()
815
817 return not self.is_derived() and \
818 not self.linked and \
819 not self.rexists()
820
822 """Remove this Node: no-op by default."""
823 return None
824
826 """Adds dependencies."""
827 try:
828 self._add_child(self.depends, self.depends_set, depend)
829 except TypeError, e:
830 e = e.args[0]
831 if SCons.Util.is_List(e):
832 s = map(str, e)
833 else:
834 s = str(e)
835 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)))
836
841
843 """Adds dependencies to ignore."""
844 try:
845 self._add_child(self.ignore, self.ignore_set, depend)
846 except TypeError, e:
847 e = e.args[0]
848 if SCons.Util.is_List(e):
849 s = map(str, e)
850 else:
851 s = str(e)
852 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)))
853
855 """Adds sources."""
856 if self._specific_sources:
857 return
858 try:
859 self._add_child(self.sources, self.sources_set, source)
860 except TypeError, e:
861 e = e.args[0]
862 if SCons.Util.is_List(e):
863 s = map(str, e)
864 else:
865 s = str(e)
866 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)))
867
869 """Adds 'child' to 'collection', first checking 'set' to see if it's
870 already present."""
871
872
873
874
875
876 added = None
877 for c in child:
878 if c not in set:
879 set.add(c)
880 collection.append(c)
881 added = 1
882 if added:
883 self._children_reset()
884
888
890 """Add a node to the list of kids waiting to be evaluated"""
891 if self.wkids != None:
892 self.wkids.append(wkid)
893
899
900 memoizer_counters.append(SCons.Memoize.CountValue('_children_get'))
901
903 try:
904 return self._memo['children_get']
905 except KeyError:
906 pass
907
908
909
910
911
912
913
914
915
916
917
918
919
920
921
922
923
924
925 if self.ignore_set:
926 if self.implicit is None:
927 iter = chain(self.sources,self.depends)
928 else:
929 iter = chain(self.sources, self.depends, self.implicit)
930
931 children = []
932 for i in iter:
933 if i not in self.ignore_set:
934 children.append(i)
935 else:
936 if self.implicit is None:
937 children = self.sources + self.depends
938 else:
939 children = self.sources + self.depends + self.implicit
940
941 self._memo['children_get'] = children
942 return children
943
945 """Return a list of all the node's direct children."""
946 if scan:
947 self.scan()
948
949
950
951
952
953
954
955
956
957
958
959
960
961
962
963
964
965
966 if self.implicit is None:
967 return self.sources + self.depends
968 else:
969 return self.sources + self.depends + self.implicit
970
972 """Return a list of the node's direct children, minus those
973 that are ignored by this node."""
974 if scan:
975 self.scan()
976 return self._children_get()
977
980
983
986
993
995 """
996
997 Must be overridden in a specific subclass to return True if this
998 Node (a dependency) has changed since the last time it was used
999 to build the specified target. prev_ni is this Node's state (for
1000 example, its file timestamp, length, maybe content signature)
1001 as of the last time the target was built.
1002
1003 Note that this method is called through the dependency, not the
1004 target, because a dependency Node must be able to use its own
1005 logic to decide if it changed. For example, File Nodes need to
1006 obey if we're configured to use timestamps, but Python Value Nodes
1007 never use timestamps and always use the content. If this method
1008 were called through the target, then each Node's implementation
1009 of this method would have to have more complicated logic to
1010 handle all the different Node types on which it might depend.
1011 """
1012 raise NotImplementedError
1013
1016
1018 """
1019 Returns if the node is up-to-date with respect to the BuildInfo
1020 stored last time it was built. The default behavior is to compare
1021 it against our own previously stored BuildInfo, but the stored
1022 BuildInfo from another Node (typically one in a Repository)
1023 can be used instead.
1024
1025 Note that we now *always* check every dependency. We used to
1026 short-circuit the check by returning as soon as we detected
1027 any difference, but we now rely on checking every dependency
1028 to make sure that any necessary Node information (for example,
1029 the content signature of an #included .h file) is updated.
1030 """
1031 t = 0
1032 if t: Trace('changed(%s [%s], %s)' % (self, classname(self), node))
1033 if node is None:
1034 node = self
1035
1036 result = False
1037
1038 bi = node.get_stored_info().binfo
1039 then = bi.bsourcesigs + bi.bdependsigs + bi.bimplicitsigs
1040 children = self.children()
1041
1042 diff = len(children) - len(then)
1043 if diff:
1044
1045
1046
1047
1048
1049 then.extend([None] * diff)
1050 if t: Trace(': old %s new %s' % (len(then), len(children)))
1051 result = True
1052
1053 for child, prev_ni in izip(children, then):
1054 if child.changed_since_last_build(self, prev_ni):
1055 if t: Trace(': %s changed' % child)
1056 result = True
1057
1058 contents = self.get_executor().get_contents()
1059 if self.has_builder():
1060 import SCons.Util
1061 newsig = SCons.Util.MD5signature(contents)
1062 if bi.bactsig != newsig:
1063 if t: Trace(': bactsig %s != newsig %s' % (bi.bactsig, newsig))
1064 result = True
1065
1066 if not result:
1067 if t: Trace(': up to date')
1068
1069 if t: Trace('\n')
1070
1071 return result
1072
1074 """Default check for whether the Node is current: unknown Node
1075 subtypes are always out of date, so they will always get built."""
1076 return None
1077
1079 """Alternate check for whether the Node is current: If all of
1080 our children were up-to-date, then this Node was up-to-date, too.
1081
1082 The SCons.Node.Alias and SCons.Node.Python.Value subclasses
1083 rebind their current() method to this method."""
1084
1085 self.binfo = self.get_binfo()
1086 if self.always_build:
1087 return None
1088 state = 0
1089 for kid in self.children(None):
1090 s = kid.get_state()
1091 if s and (not state or s > state):
1092 state = s
1093 return (state == 0 or state == SCons.Node.up_to_date)
1094
1096 """Always pass the string representation of a Node to
1097 the command interpreter literally."""
1098 return 1
1099
1112 return SCons.Util.render_tree(s, f, 1)
1113 else:
1114 return None
1115
1117 """
1118 Return an absolute path to the Node. This will return simply
1119 str(Node) by default, but for Node types that have a concept of
1120 relative path, this might return something different.
1121 """
1122 return str(self)
1123
1125 """
1126 Return a string representation of the Node that will always
1127 be the same for this particular Node, no matter what. This
1128 is by contrast to the __str__() method, which might, for
1129 instance, return a relative path for a file Node. The purpose
1130 of this method is to generate a value to be used in signature
1131 calculation for the command line used to build a target, and
1132 we use this method instead of str() to avoid unnecessary
1133 rebuilds. This method does not need to return something that
1134 would actually work in a command line; it can return any kind of
1135 nonsense, so long as it does not change.
1136 """
1137 return str(self)
1138
1140 """This is a convenience function designed primarily to be
1141 used in command generators (i.e., CommandGeneratorActions or
1142 Environment variables that are callable), which are called
1143 with a for_signature argument that is nonzero if the command
1144 generator is being called to generate a signature for the
1145 command line, which determines if we should rebuild or not.
1146
1147 Such command generators should use this method in preference
1148 to str(Node) when converting a Node to a string, passing
1149 in the for_signature parameter, such that we will call
1150 Node.for_signature() or str(Node) properly, depending on whether
1151 we are calculating a signature or actually constructing a
1152 command line."""
1153 if for_signature:
1154 return self.for_signature()
1155 return str(self)
1156
1158 """
1159 This method is expected to return an object that will function
1160 exactly like this Node, except that it implements any additional
1161 special features that we would like to be in effect for
1162 Environment variable substitution. The principle use is that
1163 some Nodes would like to implement a __getattr__() method,
1164 but putting that in the Node type itself has a tendency to kill
1165 performance. We instead put it in a proxy and return it from
1166 this method. It is legal for this method to return self
1167 if no new functionality is needed for Environment substitution.
1168 """
1169 return self
1170
1172 if not self.exists():
1173 return "building `%s' because it doesn't exist\n" % self
1174
1175 if self.always_build:
1176 return "rebuilding `%s' because AlwaysBuild() is specified\n" % self
1177
1178 old = self.get_stored_info()
1179 if old is None:
1180 return None
1181
1182 old = old.binfo
1183 old.prepare_dependencies()
1184
1185 try:
1186 old_bkids = old.bsources + old.bdepends + old.bimplicit
1187 old_bkidsigs = old.bsourcesigs + old.bdependsigs + old.bimplicitsigs
1188 except AttributeError:
1189 return "Cannot explain why `%s' is being rebuilt: No previous build information found\n" % self
1190
1191 new = self.get_binfo()
1192
1193 new_bkids = new.bsources + new.bdepends + new.bimplicit
1194 new_bkidsigs = new.bsourcesigs + new.bdependsigs + new.bimplicitsigs
1195
1196 osig = dict(izip(old_bkids, old_bkidsigs))
1197 nsig = dict(izip(new_bkids, new_bkidsigs))
1198
1199
1200
1201
1202
1203
1204
1205 def stringify( s, E=self.dir.Entry ) :
1206 if hasattr( s, 'dir' ) :
1207 return str(E(s))
1208 return str(s)
1209
1210 lines = []
1211
1212 removed = filter(lambda x, nk=new_bkids: not x in nk, old_bkids)
1213 if removed:
1214 removed = map(stringify, removed)
1215 fmt = "`%s' is no longer a dependency\n"
1216 lines.extend(map(lambda s, fmt=fmt: fmt % s, removed))
1217
1218 for k in new_bkids:
1219 if not k in old_bkids:
1220 lines.append("`%s' is a new dependency\n" % stringify(k))
1221 elif k.changed_since_last_build(self, osig[k]):
1222 lines.append("`%s' changed\n" % stringify(k))
1223
1224 if len(lines) == 0 and old_bkids != new_bkids:
1225 lines.append("the dependency order changed:\n" +
1226 "%sold: %s\n" % (' '*15, map(stringify, old_bkids)) +
1227 "%snew: %s\n" % (' '*15, map(stringify, new_bkids)))
1228
1229 if len(lines) == 0:
1230 def fmt_with_title(title, strlines):
1231 lines = string.split(strlines, '\n')
1232 sep = '\n' + ' '*(15 + len(title))
1233 return ' '*15 + title + string.join(lines, sep) + '\n'
1234 if old.bactsig != new.bactsig:
1235 if old.bact == new.bact:
1236 lines.append("the contents of the build action changed\n" +
1237 fmt_with_title('action: ', new.bact))
1238 else:
1239 lines.append("the build action changed:\n" +
1240 fmt_with_title('old: ', old.bact) +
1241 fmt_with_title('new: ', new.bact))
1242
1243 if len(lines) == 0:
1244 return "rebuilding `%s' for unknown reasons\n" % self
1245
1246 preamble = "rebuilding `%s' because" % self
1247 if len(lines) == 1:
1248 return "%s %s" % (preamble, lines[0])
1249 else:
1250 lines = ["%s:\n" % preamble] + lines
1251 return string.join(lines, ' '*11)
1252
1253 try:
1254 [].extend(UserList.UserList([]))
1255 except TypeError:
1256
1257
1258
1261 else:
1264 return str(map(str, self.data))
1265
1269
1271 """An iterator for walking a Node tree.
1272
1273 This is depth-first, children are visited before the parent.
1274 The Walker object can be initialized with any node, and
1275 returns the next node on the descent with each next() call.
1276 'kids_func' is an optional function that will be called to
1277 get the children of a node instead of calling 'children'.
1278 'cycle_func' is an optional function that will be called
1279 when a cycle is detected.
1280
1281 This class does not get caught in node cycles caused, for example,
1282 by C header file include loops.
1283 """
1284 - def __init__(self, node, kids_func=get_children,
1285 cycle_func=ignore_cycle,
1286 eval_func=do_nothing):
1287 self.kids_func = kids_func
1288 self.cycle_func = cycle_func
1289 self.eval_func = eval_func
1290 node.wkids = copy.copy(kids_func(node, None))
1291 self.stack = [node]
1292 self.history = {}
1293 self.history[node] = None
1294
1296 """Return the next node for this walk of the tree.
1297
1298 This function is intentionally iterative, not recursive,
1299 to sidestep any issues of stack size limitations.
1300 """
1301
1302 while self.stack:
1303 if self.stack[-1].wkids:
1304 node = self.stack[-1].wkids.pop(0)
1305 if not self.stack[-1].wkids:
1306 self.stack[-1].wkids = None
1307 if self.history.has_key(node):
1308 self.cycle_func(node, self.stack)
1309 else:
1310 node.wkids = copy.copy(self.kids_func(node, self.stack[-1]))
1311 self.stack.append(node)
1312 self.history[node] = None
1313 else:
1314 node = self.stack.pop()
1315 del self.history[node]
1316 if node:
1317 if self.stack:
1318 parent = self.stack[-1]
1319 else:
1320 parent = None
1321 self.eval_func(node, parent)
1322 return node
1323 return None
1324
1326 return not self.stack
1327
1328
1329 arg2nodes_lookups = []
1330