This file is indexed.

/usr/share/boost-build/build/virtual_target.py is in libboost1.54-tools-dev 1.54.0-4ubuntu3.

This file is owned by root:root, with mode 0o644.

The actual contents of the file can be viewed below.

   1
   2
   3
   4
   5
   6
   7
   8
   9
  10
  11
  12
  13
  14
  15
  16
  17
  18
  19
  20
  21
  22
  23
  24
  25
  26
  27
  28
  29
  30
  31
  32
  33
  34
  35
  36
  37
  38
  39
  40
  41
  42
  43
  44
  45
  46
  47
  48
  49
  50
  51
  52
  53
  54
  55
  56
  57
  58
  59
  60
  61
  62
  63
  64
  65
  66
  67
  68
  69
  70
  71
  72
  73
  74
  75
  76
  77
  78
  79
  80
  81
  82
  83
  84
  85
  86
  87
  88
  89
  90
  91
  92
  93
  94
  95
  96
  97
  98
  99
 100
 101
 102
 103
 104
 105
 106
 107
 108
 109
 110
 111
 112
 113
 114
 115
 116
 117
 118
 119
 120
 121
 122
 123
 124
 125
 126
 127
 128
 129
 130
 131
 132
 133
 134
 135
 136
 137
 138
 139
 140
 141
 142
 143
 144
 145
 146
 147
 148
 149
 150
 151
 152
 153
 154
 155
 156
 157
 158
 159
 160
 161
 162
 163
 164
 165
 166
 167
 168
 169
 170
 171
 172
 173
 174
 175
 176
 177
 178
 179
 180
 181
 182
 183
 184
 185
 186
 187
 188
 189
 190
 191
 192
 193
 194
 195
 196
 197
 198
 199
 200
 201
 202
 203
 204
 205
 206
 207
 208
 209
 210
 211
 212
 213
 214
 215
 216
 217
 218
 219
 220
 221
 222
 223
 224
 225
 226
 227
 228
 229
 230
 231
 232
 233
 234
 235
 236
 237
 238
 239
 240
 241
 242
 243
 244
 245
 246
 247
 248
 249
 250
 251
 252
 253
 254
 255
 256
 257
 258
 259
 260
 261
 262
 263
 264
 265
 266
 267
 268
 269
 270
 271
 272
 273
 274
 275
 276
 277
 278
 279
 280
 281
 282
 283
 284
 285
 286
 287
 288
 289
 290
 291
 292
 293
 294
 295
 296
 297
 298
 299
 300
 301
 302
 303
 304
 305
 306
 307
 308
 309
 310
 311
 312
 313
 314
 315
 316
 317
 318
 319
 320
 321
 322
 323
 324
 325
 326
 327
 328
 329
 330
 331
 332
 333
 334
 335
 336
 337
 338
 339
 340
 341
 342
 343
 344
 345
 346
 347
 348
 349
 350
 351
 352
 353
 354
 355
 356
 357
 358
 359
 360
 361
 362
 363
 364
 365
 366
 367
 368
 369
 370
 371
 372
 373
 374
 375
 376
 377
 378
 379
 380
 381
 382
 383
 384
 385
 386
 387
 388
 389
 390
 391
 392
 393
 394
 395
 396
 397
 398
 399
 400
 401
 402
 403
 404
 405
 406
 407
 408
 409
 410
 411
 412
 413
 414
 415
 416
 417
 418
 419
 420
 421
 422
 423
 424
 425
 426
 427
 428
 429
 430
 431
 432
 433
 434
 435
 436
 437
 438
 439
 440
 441
 442
 443
 444
 445
 446
 447
 448
 449
 450
 451
 452
 453
 454
 455
 456
 457
 458
 459
 460
 461
 462
 463
 464
 465
 466
 467
 468
 469
 470
 471
 472
 473
 474
 475
 476
 477
 478
 479
 480
 481
 482
 483
 484
 485
 486
 487
 488
 489
 490
 491
 492
 493
 494
 495
 496
 497
 498
 499
 500
 501
 502
 503
 504
 505
 506
 507
 508
 509
 510
 511
 512
 513
 514
 515
 516
 517
 518
 519
 520
 521
 522
 523
 524
 525
 526
 527
 528
 529
 530
 531
 532
 533
 534
 535
 536
 537
 538
 539
 540
 541
 542
 543
 544
 545
 546
 547
 548
 549
 550
 551
 552
 553
 554
 555
 556
 557
 558
 559
 560
 561
 562
 563
 564
 565
 566
 567
 568
 569
 570
 571
 572
 573
 574
 575
 576
 577
 578
 579
 580
 581
 582
 583
 584
 585
 586
 587
 588
 589
 590
 591
 592
 593
 594
 595
 596
 597
 598
 599
 600
 601
 602
 603
 604
 605
 606
 607
 608
 609
 610
 611
 612
 613
 614
 615
 616
 617
 618
 619
 620
 621
 622
 623
 624
 625
 626
 627
 628
 629
 630
 631
 632
 633
 634
 635
 636
 637
 638
 639
 640
 641
 642
 643
 644
 645
 646
 647
 648
 649
 650
 651
 652
 653
 654
 655
 656
 657
 658
 659
 660
 661
 662
 663
 664
 665
 666
 667
 668
 669
 670
 671
 672
 673
 674
 675
 676
 677
 678
 679
 680
 681
 682
 683
 684
 685
 686
 687
 688
 689
 690
 691
 692
 693
 694
 695
 696
 697
 698
 699
 700
 701
 702
 703
 704
 705
 706
 707
 708
 709
 710
 711
 712
 713
 714
 715
 716
 717
 718
 719
 720
 721
 722
 723
 724
 725
 726
 727
 728
 729
 730
 731
 732
 733
 734
 735
 736
 737
 738
 739
 740
 741
 742
 743
 744
 745
 746
 747
 748
 749
 750
 751
 752
 753
 754
 755
 756
 757
 758
 759
 760
 761
 762
 763
 764
 765
 766
 767
 768
 769
 770
 771
 772
 773
 774
 775
 776
 777
 778
 779
 780
 781
 782
 783
 784
 785
 786
 787
 788
 789
 790
 791
 792
 793
 794
 795
 796
 797
 798
 799
 800
 801
 802
 803
 804
 805
 806
 807
 808
 809
 810
 811
 812
 813
 814
 815
 816
 817
 818
 819
 820
 821
 822
 823
 824
 825
 826
 827
 828
 829
 830
 831
 832
 833
 834
 835
 836
 837
 838
 839
 840
 841
 842
 843
 844
 845
 846
 847
 848
 849
 850
 851
 852
 853
 854
 855
 856
 857
 858
 859
 860
 861
 862
 863
 864
 865
 866
 867
 868
 869
 870
 871
 872
 873
 874
 875
 876
 877
 878
 879
 880
 881
 882
 883
 884
 885
 886
 887
 888
 889
 890
 891
 892
 893
 894
 895
 896
 897
 898
 899
 900
 901
 902
 903
 904
 905
 906
 907
 908
 909
 910
 911
 912
 913
 914
 915
 916
 917
 918
 919
 920
 921
 922
 923
 924
 925
 926
 927
 928
 929
 930
 931
 932
 933
 934
 935
 936
 937
 938
 939
 940
 941
 942
 943
 944
 945
 946
 947
 948
 949
 950
 951
 952
 953
 954
 955
 956
 957
 958
 959
 960
 961
 962
 963
 964
 965
 966
 967
 968
 969
 970
 971
 972
 973
 974
 975
 976
 977
 978
 979
 980
 981
 982
 983
 984
 985
 986
 987
 988
 989
 990
 991
 992
 993
 994
 995
 996
 997
 998
 999
1000
1001
1002
1003
1004
1005
1006
1007
1008
1009
1010
1011
1012
1013
1014
1015
1016
1017
1018
1019
1020
1021
1022
1023
1024
1025
1026
1027
1028
1029
1030
1031
1032
1033
1034
1035
1036
1037
1038
1039
1040
1041
1042
1043
1044
1045
1046
1047
1048
1049
1050
1051
1052
1053
1054
1055
1056
1057
1058
1059
1060
1061
1062
1063
1064
1065
1066
1067
1068
1069
1070
1071
1072
1073
1074
1075
1076
1077
1078
1079
1080
1081
1082
1083
1084
1085
1086
1087
1088
1089
1090
1091
1092
1093
1094
1095
1096
1097
1098
1099
1100
1101
1102
1103
1104
1105
1106
1107
# Status: ported.
# Base revision: 64488.
#
#  Copyright (C) Vladimir Prus 2002. Permission to copy, use, modify, sell and
#  distribute this software is granted provided this copyright notice appears in
#  all copies. This software is provided "as is" without express or implied
#  warranty, and with no claim as to its suitability for any purpose.

#  Implements virtual targets, which correspond to actual files created during
#  build, but are not yet targets in Jam sense. They are needed, for example,
#  when searching for possible transormation sequences, when it's not known
#  if particular target should be created at all.
#
#
#                       +--------------------------+
#                       | VirtualTarget            |
#                       +==========================+
#                       | actualize                |
#                       +--------------------------+
#                       | actualize_action() = 0   |
#                       | actualize_location() = 0 |
#                       +----------------+---------+
#                                        |
#                                        ^
#                                       / \
#                                      +-+-+
#                                        |
#    +---------------------+     +-------+--------------+
#    | Action              |     | AbstractFileTarget   |
#    +=====================|   * +======================+
#    | action_name         |  +--+ action               |
#    | properties          |  |  +----------------------+
#    +---------------------+--+  | actualize_action()   |
#    | actualize()         |0..1 +-----------+----------+
#    | path()              |                 |
#    | adjust_properties() | sources         |
#    | actualize_sources() | targets         |
#    +------+--------------+                 ^
#           |                               / \
#           ^                              +-+-+
#          / \                               |
#         +-+-+                +-------------+-------------+
#           |                  |                           |
#           |           +------+---------------+  +--------+-------------+
#           |           | FileTarget           |  | SearchedLibTarget    |
#           |           +======================+  +======================+
#           |           | actualize-location() |  | actualize-location() |
#           |           +----------------------+  +----------------------+
#           |
#         +-+------------------------------+
#         |                                |
#    +----+----------------+     +---------+-----------+
#    | CompileAction       |     | LinkAction          |
#    +=====================+     +=====================+
#    | adjust_properties() |     | adjust_properties() |
#    +---------------------+     | actualize_sources() |
#                                +---------------------+
#
# The 'CompileAction' and 'LinkAction' classes are defined not here,
# but in builtin.jam modules. They are shown in the diagram to give
# the big picture.

import bjam

import re
import os.path
import string
import types

from b2.util import path, utility, set
from b2.util.utility import add_grist, get_grist, ungrist, replace_grist, get_value
from b2.util.sequence import unique
from b2.tools import common
from b2.exceptions import *
import b2.build.type
import b2.build.property_set as property_set

import b2.build.property as property

from b2.manager import get_manager
from b2.util import bjam_signature

__re_starts_with_at = re.compile ('^@(.*)')

class VirtualTargetRegistry:
    def __init__ (self, manager):
        self.manager_ = manager

        # A cache for FileTargets
        self.files_ = {}

        # A cache for targets.
        self.cache_ = {}

        # A map of actual names to virtual targets.
        # Used to make sure we don't associate same
        # actual target to two virtual targets.
        self.actual_ = {}

        self.recent_targets_ = []

        # All targets ever registed
        self.all_targets_ = []

        self.next_id_ = 0

    def register (self, target):
        """ Registers a new virtual target. Checks if there's already registered target, with the same
            name, type, project and subvariant properties, and also with the same sources
            and equal action. If such target is found it is retured and 'target' is not registered.
            Otherwise, 'target' is registered and returned.
        """
        if target.path():
            signature = target.path() + "-" + target.name()
        else:
            signature = "-" + target.name()

        result = None
        if not self.cache_.has_key (signature):
            self.cache_ [signature] = []

        for t in self.cache_ [signature]:
            a1 = t.action ()
            a2 = target.action ()

            # TODO: why are we checking for not result?
            if not result:
                if not a1 and not a2:
                    result = t
                else:
                    if a1 and a2 and a1.action_name () == a2.action_name () and a1.sources () == a2.sources ():
                        ps1 = a1.properties ()
                        ps2 = a2.properties ()
                        p1 = ps1.base () + ps1.free () +\
                            b2.util.set.difference(ps1.dependency(), ps1.incidental())
                        p2 = ps2.base () + ps2.free () +\
                            b2.util.set.difference(ps2.dependency(), ps2.incidental())
                        if p1 == p2:
                            result = t

        if not result:
            self.cache_ [signature].append (target)
            result = target

        # TODO: Don't append if we found pre-existing target?
        self.recent_targets_.append(result)
        self.all_targets_.append(result)

        return result

    def from_file (self, file, file_location, project):
        """ Creates a virtual target with appropriate name and type from 'file'.
            If a target with that name in that project was already created, returns that already
            created target.
            TODO: more correct way would be to compute path to the file, based on name and source location
            for the project, and use that path to determine if the target was already created.
            TODO: passing project with all virtual targets starts to be annoying.
        """
        # Check if we've created a target corresponding to this file.
        path = os.path.join(os.getcwd(), file_location, file)
        path = os.path.normpath(path)

        if self.files_.has_key (path):
            return self.files_ [path]

        file_type = b2.build.type.type (file)

        result = FileTarget (file, file_type, project,
                             None, file_location)
        self.files_ [path] = result

        return result

    def recent_targets(self):
        """Each target returned by 'register' is added to a list of
        'recent-target', returned by this function. So, this allows
        us to find all targets created when building a given main
        target, even if the target."""

        return self.recent_targets_

    def clear_recent_targets(self):
        self.recent_targets_ = []

    def all_targets(self):
        # Returns all virtual targets ever created
        return self.all_targets_

    # Returns all targets from 'targets' with types
    # equal to 'type' or derived from it.
    def select_by_type(self, type, targets):
        return [t for t in targets if b2.build.type.is_sybtype(t.type(), type)]

    def register_actual_name (self, actual_name, virtual_target):
        if self.actual_.has_key (actual_name):
            cs1 = self.actual_ [actual_name].creating_subvariant ()
            cs2 = virtual_target.creating_subvariant ()
            cmt1 = cs1.main_target ()
            cmt2 = cs2.main_target ()

            action1 = self.actual_ [actual_name].action ()
            action2 = virtual_target.action ()

            properties_added = []
            properties_removed = []
            if action1 and action2:
                p1 = action1.properties ()
                p1 = p1.raw ()
                p2 = action2.properties ()
                p2 = p2.raw ()

                properties_removed = set.difference (p1, p2)
                if not properties_removed: properties_removed = "none"

                properties_added = set.difference (p2, p1)
                if not properties_added: properties_added = "none"

            # FIXME: Revive printing of real location.
            get_manager().errors()(
                "Duplicate name of actual target: '%s'\n"
                "previous virtual target '%s'\n"
                "created from '%s'\n"
                "another virtual target '%s'\n"
                "created from '%s'\n"
                "added properties: '%s'\n"
                "removed properties: '%s'\n"
                % (actual_name,
                   self.actual_ [actual_name], "loc", #cmt1.location (),
                   virtual_target,
                   "loc", #cmt2.location (),
                   properties_added, properties_removed))

        else:
            self.actual_ [actual_name] = virtual_target


    def add_suffix (self, specified_name, file_type, prop_set):
        """ Appends the suffix appropriate to 'type/property_set' combination
            to the specified name and returns the result.
        """
        suffix = b2.build.type.generated_target_suffix (file_type, prop_set)

        if suffix:
            return specified_name + '.' + suffix

        else:
            return specified_name

class VirtualTarget:
    """ Potential target. It can be converted into jam target and used in
        building, if needed. However, it can be also dropped, which allows
        to search for different transformation and select only one.
        name:    name of this target.
        project: project to which this target belongs.
    """
    def __init__ (self, name, project):
        self.name_ = name
        self.project_ = project
        self.dependencies_ = []
        self.always_ = False

        # Caches if dapendencies for scanners have already been set.
        self.made_ = {}

    def manager(self):
        return self.project_.manager()

    def virtual_targets(self):
        return self.manager().virtual_targets()

    def name (self):
        """ Name of this target.
        """
        return self.name_

    def project (self):
        """ Project of this target.
        """
        return self.project_

    def depends (self, d):
        """ Adds additional instances of 'VirtualTarget' that this
            one depends on.
        """
        self.dependencies_ = unique (self.dependencies_ + d).sort ()

    def dependencies (self):
        return self.dependencies_

    def always(self):
        self.always_ = True

    def actualize (self, scanner = None):
        """ Generates all the actual targets and sets up build actions for
            this target.

            If 'scanner' is specified, creates an additional target
            with the same location as actual target, which will depend on the
            actual target and be associated with 'scanner'. That additional
            target is returned. See the docs (#dependency_scanning) for rationale.
            Target must correspond to a file if 'scanner' is specified.

            If scanner is not specified, then actual target is returned.
        """
        actual_name = self.actualize_no_scanner ()

        if self.always_:
            bjam.call("ALWAYS", actual_name)

        if not scanner:
            return actual_name

        else:
            # Add the scanner instance to the grist for name.
            g = '-'.join ([ungrist(get_grist(actual_name)), str(id(scanner))])

            name = replace_grist (actual_name, '<' + g + '>')

            if not self.made_.has_key (name):
                self.made_ [name] = True

                self.project_.manager ().engine ().add_dependency (name, actual_name)

                self.actualize_location (name)

                self.project_.manager ().scanners ().install (scanner, name, str (self))

            return name

# private: (overridables)

    def actualize_action (self, target):
        """ Sets up build actions for 'target'. Should call appropriate rules
            and set target variables.
        """
        raise BaseException ("method should be defined in derived classes")

    def actualize_location (self, target):
        """ Sets up variables on 'target' which specify its location.
        """
        raise BaseException ("method should be defined in derived classes")

    def path (self):
        """ If the target is generated one, returns the path where it will be
            generated. Otherwise, returns empty list.
        """
        raise BaseException ("method should be defined in derived classes")

    def actual_name (self):
        """ Return that actual target name that should be used
            (for the case where no scanner is involved)
        """
        raise BaseException ("method should be defined in derived classes")


class AbstractFileTarget (VirtualTarget):
    """ Target which correspond to a file. The exact mapping for file
        is not yet specified in this class. (TODO: Actually, the class name
        could be better...)

        May be a source file (when no action is specified), or
        derived file (otherwise).

        The target's grist is concatenation of project's location,
        properties of action (for derived files), and, optionally,
        value identifying the main target.

        exact:  If non-empty, the name is exactly the name
                created file should have. Otherwise, the '__init__'
                method will add suffix obtained from 'type' by
                calling 'type.generated-target-suffix'.

        type:   optional type of this target.
    """
    def __init__ (self, name, type, project, action = None, exact=False):
        VirtualTarget.__init__ (self, name, project)

        self.type_ = type

        self.action_ = action
        self.exact_ = exact

        if action:
            action.add_targets ([self])

            if self.type and not exact:
                self.__adjust_name (name)


        self.actual_name_ = None
        self.path_ = None
        self.intermediate_ = False
        self.creating_subvariant_ = None

        # True if this is a root target.
        self.root_ = False

    def type (self):
        return self.type_

    def set_path (self, path):
        """ Sets the path. When generating target name, it will override any path
            computation from properties.
        """
        self.path_ = path

    def action (self):
        """ Returns the action.
        """
        return self.action_

    def root (self, set = None):
        """ Sets/gets the 'root' flag. Target is root is it directly correspods to some
            variant of a main target.
        """
        if set:
            self.root_ = True
        return self.root_

    def creating_subvariant (self, s = None):
        """ Gets or sets the subvariant which created this target. Subvariant
        is set when target is brought into existance, and is never changed
        after that. In particual, if target is shared by subvariant, only
        the first is stored.
        s:  If specified, specified the value to set,
                which should be instance of 'subvariant' class.
        """
        if s and not self.creating_subvariant ():
            if self.creating_subvariant ():
                raise BaseException ("Attempt to change 'dg'")

            else:
                self.creating_subvariant_ = s

        return self.creating_subvariant_

    def actualize_action (self, target):
        if self.action_:
            self.action_.actualize ()

    # Return a human-readable representation of this target
    #
    # If this target has an action, that's:
    #
    #    { <action-name>-<self.name>.<self.type> <action-sources>... }
    #
    # otherwise, it's:
    #
    #    { <self.name>.<self.type> }
    #
    def str(self):
        a = self.action()

        name_dot_type = self.name_ + "." + self.type_

        if a:
            action_name = a.action_name()
            ss = [ s.str() for s in a.sources()]

            return "{ %s-%s %s}" % (action_name, name_dot_type, str(ss))
        else:
            return "{ " + name_dot_type + " }"

# private:

    def actual_name (self):
        if not self.actual_name_:
            self.actual_name_ = '<' + self.grist() + '>' + self.name_

        return self.actual_name_

    def grist (self):
        """Helper to 'actual_name', above. Compute unique prefix used to distinguish
            this target from other targets with the same name which create different
            file.
        """
        # Depending on target, there may be different approaches to generating
        # unique prefixes. We'll generate prefixes in the form
        # <one letter approach code> <the actual prefix>
        path = self.path ()

        if path:
            # The target will be generated to a known path. Just use the path
            # for identification, since path is as unique as it can get.
            return 'p' + path

        else:
            # File is either source, which will be searched for, or is not a file at
            # all. Use the location of project for distinguishing.
            project_location = self.project_.get ('location')
            path_components = b2.util.path.split(project_location)
            location_grist = '!'.join (path_components)

            if self.action_:
                ps = self.action_.properties ()
                property_grist = ps.as_path ()
                # 'property_grist' can be empty when 'ps' is an empty
                # property set.
                if property_grist:
                    location_grist = location_grist + '/' + property_grist

            return 'l' + location_grist

    def __adjust_name(self, specified_name):
        """Given the target name specified in constructor, returns the
        name which should be really used, by looking at the <tag> properties.
        The tag properties come in two flavour:
          - <tag>value,
          - <tag>@rule-name
        In the first case, value is just added to name
        In the second case, the specified rule is called with specified name,
        target type and properties and should return the new name.
        If not <tag> property is specified, or the rule specified by
        <tag> returns nothing, returns the result of calling
        virtual-target.add-suffix"""

        if self.action_:
            ps = self.action_.properties()
        else:
            ps = property_set.empty()

        # FIXME: I'm not sure how this is used, need to check with
        # Rene to figure out how to implement
        #~ We add ourselves to the properties so that any tag rule can get
        #~ more direct information about the target than just that available
        #~ through the properties. This is useful in implementing
        #~ name changes based on the sources of the target. For example to
        #~ make unique names of object files based on the source file.
        #~ --grafik
        #ps = property_set.create(ps.raw() + ["<target>%s" % "XXXX"])
        #ps = [ property-set.create [ $(ps).raw ] <target>$(__name__) ] ;

        tag = ps.get("<tag>")

        if tag:

            if len(tag) > 1:
                get_manager().errors()(
                    """<tag>@rulename is present but is not the only <tag> feature""")

            tag = tag[0]
            if callable(tag):
                self.name_ = tag(specified_name, self.type_, ps)
            else:
                if not tag[0] == '@':
                    self.manager_.errors()("""The value of the <tag> feature must be '@rule-nane'""")

                exported_ps = b2.util.value_to_jam(ps, methods=True)
                self.name_ = b2.util.call_jam_function(
                    tag[1:], specified_name, self.type_, exported_ps)
                if self.name_:
                    self.name_ = self.name_[0]

        # If there's no tag or the tag rule returned nothing.
        if not tag or not self.name_:
            self.name_ = add_prefix_and_suffix(specified_name, self.type_, ps)

    def actualize_no_scanner(self):
        name = self.actual_name()

        # Do anything only on the first invocation
        if not self.made_:
            self.made_[name] = True

            if self.action_:
                # For non-derived target, we don't care if there
                # are several virtual targets that refer to the same name.
                # One case when this is unavoidable is when file name is
                # main.cpp and two targets have types CPP (for compiling)
                # and MOCCABLE_CPP (for convertion to H via Qt tools).
                self.virtual_targets().register_actual_name(name, self)

            for i in self.dependencies_:
                self.manager_.engine().add_dependency(name, i.actualize())

            self.actualize_location(name)
            self.actualize_action(name)

        return name

@bjam_signature((["specified_name"], ["type"], ["property_set"]))
def add_prefix_and_suffix(specified_name, type, property_set):
    """Appends the suffix appropriate to 'type/property-set' combination
    to the specified name and returns the result."""

    property_set = b2.util.jam_to_value_maybe(property_set)

    suffix = ""
    if type:
        suffix = b2.build.type.generated_target_suffix(type, property_set)

    # Handle suffixes for which no leading dot is desired.  Those are
    # specified by enclosing them in <...>.  Needed by python so it
    # can create "_d.so" extensions, for example.
    if get_grist(suffix):
        suffix = ungrist(suffix)
    elif suffix:
        suffix = "." + suffix

    prefix = ""
    if type:
        prefix = b2.build.type.generated_target_prefix(type, property_set)

    if specified_name.startswith(prefix):
        prefix = ""

    if not prefix:
        prefix = ""
    if not suffix:
        suffix = ""
    return prefix + specified_name + suffix


class FileTarget (AbstractFileTarget):
    """ File target with explicitly known location.

        The file path is determined as
           - value passed to the 'set_path' method, if any
           - for derived files, project's build dir, joined with components
             that describe action's properties. If the free properties
             are not equal to the project's reference properties
             an element with name of main target is added.
           - for source files, project's source dir

        The file suffix is
            - the value passed to the 'suffix' method, if any, or
            - the suffix which correspond to the target's type.
    """
    def __init__ (self, name, type, project, action = None, path=None, exact=False):
        AbstractFileTarget.__init__ (self, name, type, project, action, exact)

        self.path_ = path

    def __str__(self):
        if self.type_:
            return self.name_ + "." + self.type_
        else:
            return self.name_

    def clone_with_different_type(self, new_type):
        return FileTarget(self.name_, new_type, self.project_,
                          self.action_, self.path_, exact=True)

    def actualize_location (self, target):
        engine = self.project_.manager_.engine ()

        if self.action_:
            # This is a derived file.
            path = self.path ()
            engine.set_target_variable (target, 'LOCATE', path)

            # Make sure the path exists.
            engine.add_dependency (target, path)
            common.mkdir(engine, path)

            # It's possible that the target name includes a directory
            # too, for example when installing headers. Create that
            # directory.
            d = os.path.dirname(get_value(target))
            if d:
                d = os.path.join(path, d)
                engine.add_dependency(target, d)
                common.mkdir(engine, d)

            # For real file target, we create a fake target that
            # depends on the real target. This allows to run
            #
            #    bjam hello.o
            #
            # without trying to guess the name of the real target.
            # Note the that target has no directory name, and a special
            # grist <e>.
            #
            # First, that means that "bjam hello.o" will build all
            # known hello.o targets.
            # Second, the <e> grist makes sure this target won't be confused
            # with other targets, for example, if we have subdir 'test'
            # with target 'test' in it that includes 'test.o' file,
            # then the target for directory will be just 'test' the target
            # for test.o will be <ptest/bin/gcc/debug>test.o and the target
            # we create below will be <e>test.o
            engine.add_dependency("<e>%s" % get_value(target), target)

            # Allow bjam <path-to-file>/<file> to work.  This won't catch all
            # possible ways to refer to the path (relative/absolute, extra ".",
            # various "..", but should help in obvious cases.
            engine.add_dependency("<e>%s" % (os.path.join(path, get_value(target))), target)

        else:
            # This is a source file.
            engine.set_target_variable (target, 'SEARCH', self.project_.get ('source-location'))


    def path (self):
        """ Returns the directory for this target.
        """
        if not self.path_:
            if self.action_:
                p = self.action_.properties ()
                (target_path, relative_to_build_dir) = p.target_path ()

                if relative_to_build_dir:
                    # Indicates that the path is relative to
                    # build dir.
                    target_path = os.path.join (self.project_.build_dir (), target_path)

                # Store the computed path, so that it's not recomputed
                # any more
                self.path_ = target_path

        return self.path_


class NotFileTarget(AbstractFileTarget):

    def __init__(self, name, project, action):
        AbstractFileTarget.__init__(self, name, None, project, action)

    def path(self):
        """Returns nothing, to indicate that target path is not known."""
        return None

    def actualize_location(self, target):
        bjam.call("NOTFILE", target)
        bjam.call("ALWAYS", target)
        bjam.call("NOUPDATE", target)


class Action:
    """ Class which represents an action.
        Both 'targets' and 'sources' should list instances of 'VirtualTarget'.
        Action name should name a rule with this prototype
            rule action_name ( targets + : sources * : properties * )
        Targets and sources are passed as actual jam targets. The rule may
        not establish dependency relationship, but should do everything else.
    """
    def __init__ (self, manager, sources, action_name, prop_set):
        assert(isinstance(prop_set, property_set.PropertySet))
        assert type(sources) == types.ListType
        self.sources_ = sources
        self.action_name_ = action_name
        if not prop_set:
            prop_set = property_set.empty()
        self.properties_ = prop_set
        if not all(isinstance(v, VirtualTarget) for v in prop_set.get('implicit-dependency')):
            import pdb
            pdb.set_trace()

        self.manager_ = manager
        self.engine_ = self.manager_.engine ()
        self.targets_ = []

        # Indicates whether this has been actualized or not.
        self.actualized_ = False

        self.dependency_only_sources_ = []
        self.actual_sources_ = []


    def add_targets (self, targets):
        self.targets_ += targets


    def replace_targets (old_targets, new_targets):
        self.targets_ = [t for t in targets if not t in old_targets] + new_targets

    def targets (self):
        return self.targets_

    def sources (self):
        return self.sources_

    def action_name (self):
        return self.action_name_

    def properties (self):
        return self.properties_

    def actualize (self):
        """ Generates actual build instructions.
        """
        if self.actualized_:
            return

        self.actualized_ = True

        ps = self.properties ()
        properties = self.adjust_properties (ps)


        actual_targets = []

        for i in self.targets ():
            actual_targets.append (i.actualize ())

        self.actualize_sources (self.sources (), properties)

        self.engine_.add_dependency (actual_targets, self.actual_sources_ + self.dependency_only_sources_)

        # FIXME: check the comment below. Was self.action_name_ [1]
        # Action name can include additional rule arguments, which should not
        # be passed to 'set-target-variables'.
        # FIXME: breaking circular dependency
        import toolset
        toolset.set_target_variables (self.manager_, self.action_name_, actual_targets, properties)

        engine = self.manager_.engine ()

        # FIXME: this is supposed to help --out-xml option, but we don't
        # implement that now, and anyway, we should handle it in Python,
        # not but putting variables on bjam-level targets.
        bjam.call("set-target-variable", actual_targets, ".action", repr(self))

        self.manager_.engine ().set_update_action (self.action_name_, actual_targets, self.actual_sources_,
                                                   properties)

        # Since we set up creating action here, we also set up
        # action for cleaning up
        self.manager_.engine ().set_update_action ('common.Clean', 'clean-all',
                                                   actual_targets)

        return actual_targets

    def actualize_source_type (self, sources, prop_set):
        """ Helper for 'actualize_sources'.
            For each passed source, actualizes it with the appropriate scanner.
            Returns the actualized virtual targets.
        """
        result = []
        for i in sources:
            scanner = None

# FIXME: what's this?
#            if isinstance (i, str):
#                i = self.manager_.get_object (i)

            if i.type ():
                scanner = b2.build.type.get_scanner (i.type (), prop_set)

            r = i.actualize (scanner)
            result.append (r)

        return result

    def actualize_sources (self, sources, prop_set):
        """ Creates actual jam targets for sources. Initializes two member
            variables:
            'self.actual_sources_' -- sources which are passed to updating action
            'self.dependency_only_sources_' -- sources which are made dependencies, but
            are not used otherwise.

            New values will be *appended* to the variables. They may be non-empty,
            if caller wants it.
        """
        dependencies = self.properties_.get ('<dependency>')

        self.dependency_only_sources_ += self.actualize_source_type (dependencies, prop_set)
        self.actual_sources_ += self.actualize_source_type (sources, prop_set)

        # This is used to help bjam find dependencies in generated headers
        # in other main targets.
        # Say:
        #
        #   make a.h : ....... ;
        #   exe hello : hello.cpp : <implicit-dependency>a.h ;
        #
        # However, for bjam to find the dependency the generated target must
        # be actualized (i.e. have the jam target). In the above case,
        # if we're building just hello ("bjam hello"), 'a.h' won't be
        # actualized unless we do it here.
        implicit = self.properties_.get("<implicit-dependency>")

        for i in implicit:
            i.actualize()

    def adjust_properties (self, prop_set):
        """ Determines real properties when trying building with 'properties'.
            This is last chance to fix properties, for example to adjust includes
            to get generated headers correctly. Default implementation returns
            its argument.
        """
        return prop_set


class NullAction (Action):
    """ Action class which does nothing --- it produces the targets with
        specific properties out of nowhere. It's needed to distinguish virtual
        targets with different properties that are known to exist, and have no
        actions which create them.
    """
    def __init__ (self, manager, prop_set):
        Action.__init__ (self, manager, [], None, prop_set)

    def actualize (self):
        if not self.actualized_:
            self.actualized_ = True

            for i in self.targets ():
                i.actualize ()

class NonScanningAction(Action):
    """Class which acts exactly like 'action', except that the sources
    are not scanned for dependencies."""

    def __init__(self, sources, action_name, property_set):
        #FIXME: should the manager parameter of Action.__init__
        #be removed? -- Steven Watanabe
        Action.__init__(self, b2.manager.get_manager(), sources, action_name, property_set)

    def actualize_source_type(self, sources, property_set):

        result = []
        for s in sources:
            result.append(s.actualize())
        return result

def traverse (target, include_roots = False, include_sources = False):
    """ Traverses the dependency graph of 'target' and return all targets that will
        be created before this one is created. If root of some dependency graph is
        found during traversal, it's either included or not, dependencing of the
        value of 'include_roots'. In either case, sources of root are not traversed.
    """
    result = []

    if target.action ():
        action = target.action ()

        # This includes 'target' as well
        result += action.targets ()

        for t in action.sources ():

            # FIXME:
            # TODO: see comment in Manager.register_object ()
            #if not isinstance (t, VirtualTarget):
            #    t = target.project_.manager_.get_object (t)

            if not t.root ():
                result += traverse (t, include_roots, include_sources)

            elif include_roots:
                result.append (t)

    elif include_sources:
        result.append (target)

    return result

def clone_action (action, new_project, new_action_name, new_properties):
    """Takes an 'action' instances and creates new instance of it
    and all produced target. The rule-name and properties are set
    to 'new-rule-name' and 'new-properties', if those are specified.
    Returns the cloned action."""

    if not new_action_name:
        new_action_name = action.action_name()

    if not new_properties:
        new_properties = action.properties()

    cloned_action = action.__class__(action.manager_, action.sources(), new_action_name,
                                     new_properties)

    cloned_targets = []
    for target in action.targets():

        n = target.name()
        # Don't modify the name of the produced targets. Strip the directory f
        cloned_target = FileTarget(n, target.type(), new_project,
                                   cloned_action, exact=True)

        d = target.dependencies()
        if d:
            cloned_target.depends(d)
        cloned_target.root(target.root())
        cloned_target.creating_subvariant(target.creating_subvariant())

        cloned_targets.append(cloned_target)

    return cloned_action

class Subvariant:

    def __init__ (self, main_target, prop_set, sources, build_properties, sources_usage_requirements, created_targets):
        """
        main_target:                 The instance of MainTarget class
        prop_set:                    Properties requested for this target
        sources:
        build_properties:            Actually used properties
        sources_usage_requirements:  Properties propagated from sources
        created_targets:             Top-level created targets
        """
        self.main_target_ = main_target
        self.properties_ = prop_set
        self.sources_ = sources
        self.build_properties_ = build_properties
        self.sources_usage_requirements_ = sources_usage_requirements
        self.created_targets_ = created_targets

        self.usage_requirements_ = None

        # Pre-compose the list of other dependency graphs, on which this one
        # depends
        deps = build_properties.get('<implicit-dependency>')

        self.other_dg_ = []
        for d in deps:
            self.other_dg_.append(d.creating_subvariant ())

        self.other_dg_ = unique (self.other_dg_)

        self.implicit_includes_cache_ = {}
        self.target_directories_ = None

    def main_target (self):
        return self.main_target_

    def created_targets (self):
        return self.created_targets_

    def requested_properties (self):
        return self.properties_

    def build_properties (self):
        return self.build_properties_

    def sources_usage_requirements (self):
        return self.sources_usage_requirements_

    def set_usage_requirements (self, usage_requirements):
        self.usage_requirements_ = usage_requirements

    def usage_requirements (self):
        return self.usage_requirements_

    def all_referenced_targets(self, result):
        """Returns all targets referenced by this subvariant,
        either directly or indirectly, and either as sources,
        or as dependency properties. Targets referred with
        dependency property are returned a properties, not targets."""

        # Find directly referenced targets.
        deps = self.build_properties().dependency()
        all_targets = self.sources_ + deps

        # Find other subvariants.
        r = []
        for e in all_targets:
            if not e in result:
                result.add(e)
                if isinstance(e, property.Property):
                    t = e.value()
                else:
                    t = e

                # FIXME: how can this be?
                cs = t.creating_subvariant()
                if cs:
                    r.append(cs)
        r = unique(r)
        for s in r:
            if s != self:
                s.all_referenced_targets(result)


    def implicit_includes (self, feature, target_type):
        """ Returns the properties which specify implicit include paths to
            generated headers. This traverses all targets in this subvariant,
            and subvariants referred by <implcit-dependecy>properties.
            For all targets which are of type 'target-type' (or for all targets,
            if 'target_type' is not specified), the result will contain
            <$(feature)>path-to-that-target.
        """

        if not target_type:
            key = feature
        else:
            key = feature + "-" + target_type


        result = self.implicit_includes_cache_.get(key)
        if not result:
            target_paths = self.all_target_directories(target_type)
            target_paths = unique(target_paths)
            result = ["<%s>%s" % (feature, p) for p in target_paths]
            self.implicit_includes_cache_[key] = result

        return result

    def all_target_directories(self, target_type = None):
        # TODO: does not appear to use target_type in deciding
        # if we've computed this already.
        if not self.target_directories_:
            self.target_directories_ = self.compute_target_directories(target_type)
        return self.target_directories_

    def compute_target_directories(self, target_type=None):
        result = []
        for t in self.created_targets():
            if not target_type or b2.build.type.is_derived(t.type(), target_type):
                result.append(t.path())

        for d in self.other_dg_:
            result.extend(d.all_target_directories(target_type))

        result = unique(result)
        return result