summaryrefslogtreecommitdiff
path: root/src/SConscript
blob: 88903088d79f1ecef66dd7ac001b978adc7ce3b3 (plain)
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
1108
1109
1110
1111
1112
1113
1114
1115
1116
1117
1118
1119
1120
1121
1122
1123
1124
1125
1126
1127
1128
1129
1130
1131
1132
1133
1134
1135
1136
1137
1138
1139
1140
1141
1142
1143
1144
1145
1146
1147
1148
1149
1150
1151
1152
1153
1154
1155
1156
1157
1158
1159
1160
1161
1162
1163
1164
1165
1166
1167
1168
1169
1170
1171
1172
1173
1174
1175
1176
1177
1178
# -*- mode:python -*-

# Copyright (c) 2004-2005 The Regents of The University of Michigan
# All rights reserved.
#
# Redistribution and use in source and binary forms, with or without
# modification, are permitted provided that the following conditions are
# met: redistributions of source code must retain the above copyright
# notice, this list of conditions and the following disclaimer;
# redistributions in binary form must reproduce the above copyright
# notice, this list of conditions and the following disclaimer in the
# documentation and/or other materials provided with the distribution;
# neither the name of the copyright holders nor the names of its
# contributors may be used to endorse or promote products derived from
# this software without specific prior written permission.
#
# THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
# "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
# LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
# A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
# OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
# SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
# LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
# DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
# THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
# (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
# OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
#
# Authors: Nathan Binkert

import array
import bisect
import imp
import marshal
import os
import re
import subprocess
import sys
import zlib

from os.path import basename, dirname, exists, isdir, isfile, join as joinpath

import SCons

from gem5_scons import Transform

# This file defines how to build a particular configuration of gem5
# based on variable settings in the 'env' build environment.

Import('*')

# Children need to see the environment
Export('env')

build_env = [(opt, env[opt]) for opt in export_vars]

from m5.util import code_formatter, compareVersions

########################################################################
# Code for adding source files of various types
#
# When specifying a source file of some type, a set of tags can be
# specified for that file.

class SourceList(list):
    def with_tags_that(self, predicate):
        '''Return a list of sources with tags that satisfy a predicate.'''
        def match(source):
            return predicate(source.tags)
        return SourceList(filter(match, self))

    def with_any_tags(self, *tags):
        '''Return a list of sources with any of the supplied tags.'''
        return self.with_tags_that(lambda stags: len(tags & stags) > 0)

    def with_all_tags(self, *tags):
        '''Return a list of sources with all of the supplied tags.'''
        return self.with_tags_that(lambda stags: tags <= stags)

    def with_tag(self, tag):
        '''Return a list of sources with the supplied tag.'''
        return self.with_tags_that(lambda stags: tag in stags)

    def without_tags(self, *tags):
        '''Return a list of sources without any of the supplied tags.'''
        return self.with_tags_that(lambda stags: len(tags & stags) == 0)

    def without_tag(self, tag):
        '''Return a list of sources with the supplied tag.'''
        return self.with_tags_that(lambda stags: tag not in stags)

class SourceMeta(type):
    '''Meta class for source files that keeps track of all files of a
    particular type.'''
    def __init__(cls, name, bases, dict):
        super(SourceMeta, cls).__init__(name, bases, dict)
        cls.all = SourceList()

class SourceFile(object):
    '''Base object that encapsulates the notion of a source file.
    This includes, the source node, target node, various manipulations
    of those.  A source file also specifies a set of tags which
    describing arbitrary properties of the source file.'''
    __metaclass__ = SourceMeta

    static_objs = {}
    shared_objs = {}

    def __init__(self, source, tags=None, add_tags=None):
        if tags is None:
            tags='gem5 lib'
        if isinstance(tags, basestring):
            tags = set([tags])
        if isinstance(add_tags, basestring):
            add_tags = set([add_tags])
        if add_tags:
            tags = tags | add_tags
        self.tags = set(tags)

        tnode = source
        if not isinstance(source, SCons.Node.FS.File):
            tnode = File(source)

        self.tnode = tnode
        self.snode = tnode.srcnode()

        for base in type(self).__mro__:
            if issubclass(base, SourceFile):
                base.all.append(self)

    def static(self, env):
        key = (self.tnode, env['OBJSUFFIX'])
        if not key in self.static_objs:
            self.static_objs[key] = env.StaticObject(self.tnode)
        return self.static_objs[key]

    def shared(self, env):
        key = (self.tnode, env['OBJSUFFIX'])
        if not key in self.shared_objs:
            self.shared_objs[key] = env.SharedObject(self.tnode)
        return self.shared_objs[key]

    @property
    def filename(self):
        return str(self.tnode)

    @property
    def dirname(self):
        return dirname(self.filename)

    @property
    def basename(self):
        return basename(self.filename)

    @property
    def extname(self):
        index = self.basename.rfind('.')
        if index <= 0:
            # dot files aren't extensions
            return self.basename, None

        return self.basename[:index], self.basename[index+1:]

    def __lt__(self, other): return self.filename < other.filename
    def __le__(self, other): return self.filename <= other.filename
    def __gt__(self, other): return self.filename > other.filename
    def __ge__(self, other): return self.filename >= other.filename
    def __eq__(self, other): return self.filename == other.filename
    def __ne__(self, other): return self.filename != other.filename

class Source(SourceFile):
    ungrouped_tag = 'No link group'
    source_groups = set()

    _current_group_tag = ungrouped_tag

    @staticmethod
    def link_group_tag(group):
        return 'link group: %s' % group

    @classmethod
    def set_group(cls, group):
        new_tag = Source.link_group_tag(group)
        Source._current_group_tag = new_tag
        Source.source_groups.add(group)

    def _add_link_group_tag(self):
        self.tags.add(Source._current_group_tag)

    '''Add a c/c++ source file to the build'''
    def __init__(self, source, tags=None, add_tags=None):
        '''specify the source file, and any tags'''
        super(Source, self).__init__(source, tags, add_tags)
        self._add_link_group_tag()

class PySource(SourceFile):
    '''Add a python source file to the named package'''
    invalid_sym_char = re.compile('[^A-z0-9_]')
    modules = {}
    tnodes = {}
    symnames = {}

    def __init__(self, package, source, tags=None, add_tags=None):
        '''specify the python package, the source file, and any tags'''
        super(PySource, self).__init__(source, tags, add_tags)

        modname,ext = self.extname
        assert ext == 'py'

        if package:
            path = package.split('.')
        else:
            path = []

        modpath = path[:]
        if modname != '__init__':
            modpath += [ modname ]
        modpath = '.'.join(modpath)

        arcpath = path + [ self.basename ]
        abspath = self.snode.abspath
        if not exists(abspath):
            abspath = self.tnode.abspath

        self.package = package
        self.modname = modname
        self.modpath = modpath
        self.arcname = joinpath(*arcpath)
        self.abspath = abspath
        self.compiled = File(self.filename + 'c')
        self.cpp = File(self.filename + '.cc')
        self.symname = PySource.invalid_sym_char.sub('_', modpath)

        PySource.modules[modpath] = self
        PySource.tnodes[self.tnode] = self
        PySource.symnames[self.symname] = self

class SimObject(PySource):
    '''Add a SimObject python file as a python source object and add
    it to a list of sim object modules'''

    fixed = False
    modnames = []

    def __init__(self, source, tags=None, add_tags=None):
        '''Specify the source file and any tags (automatically in
        the m5.objects package)'''
        super(SimObject, self).__init__('m5.objects', source, tags, add_tags)
        if self.fixed:
            raise AttributeError, "Too late to call SimObject now."

        bisect.insort_right(SimObject.modnames, self.modname)

class ProtoBuf(SourceFile):
    '''Add a Protocol Buffer to build'''

    def __init__(self, source, tags=None, add_tags=None):
        '''Specify the source file, and any tags'''
        super(ProtoBuf, self).__init__(source, tags, add_tags)

        # Get the file name and the extension
        modname,ext = self.extname
        assert ext == 'proto'

        # Currently, we stick to generating the C++ headers, so we
        # only need to track the source and header.
        self.cc_file = File(modname + '.pb.cc')
        self.hh_file = File(modname + '.pb.h')

class UnitTest(object):
    '''Create a UnitTest'''

    all = []
    def __init__(self, target, *sources, **kwargs):
        '''Specify the target name and any sources.  Sources that are
        not SourceFiles are evalued with Source().  All files are
        tagged with the name of the UnitTest target.'''

        srcs = SourceList()
        for src in sources:
            if not isinstance(src, SourceFile):
                src = Source(src, tags=str(target))
            srcs.append(src)

        self.sources = srcs
        self.target = target
        self.main = kwargs.get('main', False)
        self.all.append(self)

class GTest(UnitTest):
    '''Create a unit test based on the google test framework.'''

    all = []
    def __init__(self, *args, **kwargs):
        super(GTest, self).__init__(*args, **kwargs)
        self.dir = Dir('.')

# Children should have access
Export('Source')
Export('PySource')
Export('SimObject')
Export('ProtoBuf')
Export('UnitTest')
Export('GTest')

########################################################################
#
# Debug Flags
#
debug_flags = {}
def DebugFlag(name, desc=None):
    if name in debug_flags:
        raise AttributeError, "Flag %s already specified" % name
    debug_flags[name] = (name, (), desc)

def CompoundFlag(name, flags, desc=None):
    if name in debug_flags:
        raise AttributeError, "Flag %s already specified" % name

    compound = tuple(flags)
    debug_flags[name] = (name, compound, desc)

Export('DebugFlag')
Export('CompoundFlag')

########################################################################
#
# Set some compiler variables
#

# Include file paths are rooted in this directory.  SCons will
# automatically expand '.' to refer to both the source directory and
# the corresponding build directory to pick up generated include
# files.
env.Append(CPPPATH=Dir('.'))

for extra_dir in extras_dir_list:
    env.Append(CPPPATH=Dir(extra_dir))

# Workaround for bug in SCons version > 0.97d20071212
# Scons bug id: 2006 gem5 Bug id: 308
for root, dirs, files in os.walk(base_dir, topdown=True):
    Dir(root[len(base_dir) + 1:])

########################################################################
#
# Walk the tree and execute all SConscripts in subdirectories
#

here = Dir('.').srcnode().abspath
for root, dirs, files in os.walk(base_dir, topdown=True):
    if root == here:
        # we don't want to recurse back into this SConscript
        continue

    if 'SConscript' in files:
        build_dir = joinpath(env['BUILDDIR'], root[len(base_dir) + 1:])
        Source.set_group(build_dir)
        SConscript(joinpath(root, 'SConscript'), variant_dir=build_dir)

for extra_dir in extras_dir_list:
    prefix_len = len(dirname(extra_dir)) + 1

    # Also add the corresponding build directory to pick up generated
    # include files.
    env.Append(CPPPATH=Dir(joinpath(env['BUILDDIR'], extra_dir[prefix_len:])))

    for root, dirs, files in os.walk(extra_dir, topdown=True):
        # if build lives in the extras directory, don't walk down it
        if 'build' in dirs:
            dirs.remove('build')

        if 'SConscript' in files:
            build_dir = joinpath(env['BUILDDIR'], root[prefix_len:])
            SConscript(joinpath(root, 'SConscript'), variant_dir=build_dir)

for opt in export_vars:
    env.ConfigFile(opt)

def makeTheISA(source, target, env):
    isas = [ src.get_contents() for src in source ]
    target_isa = env['TARGET_ISA']
    def define(isa):
        return isa.upper() + '_ISA'

    def namespace(isa):
        return isa[0].upper() + isa[1:].lower() + 'ISA'


    code = code_formatter()
    code('''\
#ifndef __CONFIG_THE_ISA_HH__
#define __CONFIG_THE_ISA_HH__

''')

    # create defines for the preprocessing and compile-time determination
    for i,isa in enumerate(isas):
        code('#define $0 $1', define(isa), i + 1)
    code()

    # create an enum for any run-time determination of the ISA, we
    # reuse the same name as the namespaces
    code('enum class Arch {')
    for i,isa in enumerate(isas):
        if i + 1 == len(isas):
            code('  $0 = $1', namespace(isa), define(isa))
        else:
            code('  $0 = $1,', namespace(isa), define(isa))
    code('};')

    code('''

#define THE_ISA ${{define(target_isa)}}
#define TheISA ${{namespace(target_isa)}}
#define THE_ISA_STR "${{target_isa}}"

#endif // __CONFIG_THE_ISA_HH__''')

    code.write(str(target[0]))

env.Command('config/the_isa.hh', map(Value, all_isa_list),
            MakeAction(makeTheISA, Transform("CFG ISA", 0)))

def makeTheGPUISA(source, target, env):
    isas = [ src.get_contents() for src in source ]
    target_gpu_isa = env['TARGET_GPU_ISA']
    def define(isa):
        return isa.upper() + '_ISA'

    def namespace(isa):
        return isa[0].upper() + isa[1:].lower() + 'ISA'


    code = code_formatter()
    code('''\
#ifndef __CONFIG_THE_GPU_ISA_HH__
#define __CONFIG_THE_GPU_ISA_HH__

''')

    # create defines for the preprocessing and compile-time determination
    for i,isa in enumerate(isas):
        code('#define $0 $1', define(isa), i + 1)
    code()

    # create an enum for any run-time determination of the ISA, we
    # reuse the same name as the namespaces
    code('enum class GPUArch {')
    for i,isa in enumerate(isas):
        if i + 1 == len(isas):
            code('  $0 = $1', namespace(isa), define(isa))
        else:
            code('  $0 = $1,', namespace(isa), define(isa))
    code('};')

    code('''

#define THE_GPU_ISA ${{define(target_gpu_isa)}}
#define TheGpuISA ${{namespace(target_gpu_isa)}}
#define THE_GPU_ISA_STR "${{target_gpu_isa}}"

#endif // __CONFIG_THE_GPU_ISA_HH__''')

    code.write(str(target[0]))

env.Command('config/the_gpu_isa.hh', map(Value, all_gpu_isa_list),
            MakeAction(makeTheGPUISA, Transform("CFG ISA", 0)))

########################################################################
#
# Prevent any SimObjects from being added after this point, they
# should all have been added in the SConscripts above
#
SimObject.fixed = True

class DictImporter(object):
    '''This importer takes a dictionary of arbitrary module names that
    map to arbitrary filenames.'''
    def __init__(self, modules):
        self.modules = modules
        self.installed = set()

    def __del__(self):
        self.unload()

    def unload(self):
        import sys
        for module in self.installed:
            del sys.modules[module]
        self.installed = set()

    def find_module(self, fullname, path):
        if fullname == 'm5.defines':
            return self

        if fullname == 'm5.objects':
            return self

        if fullname.startswith('_m5'):
            return None

        source = self.modules.get(fullname, None)
        if source is not None and fullname.startswith('m5.objects'):
            return self

        return None

    def load_module(self, fullname):
        mod = imp.new_module(fullname)
        sys.modules[fullname] = mod
        self.installed.add(fullname)

        mod.__loader__ = self
        if fullname == 'm5.objects':
            mod.__path__ = fullname.split('.')
            return mod

        if fullname == 'm5.defines':
            mod.__dict__['buildEnv'] = m5.util.SmartDict(build_env)
            return mod

        source = self.modules[fullname]
        if source.modname == '__init__':
            mod.__path__ = source.modpath
        mod.__file__ = source.abspath

        exec file(source.abspath, 'r') in mod.__dict__

        return mod

import m5.SimObject
import m5.params
from m5.util import code_formatter

m5.SimObject.clear()
m5.params.clear()

# install the python importer so we can grab stuff from the source
# tree itself.  We can't have SimObjects added after this point or
# else we won't know about them for the rest of the stuff.
importer = DictImporter(PySource.modules)
sys.meta_path[0:0] = [ importer ]

# import all sim objects so we can populate the all_objects list
# make sure that we're working with a list, then let's sort it
for modname in SimObject.modnames:
    exec('from m5.objects import %s' % modname)

# we need to unload all of the currently imported modules so that they
# will be re-imported the next time the sconscript is run
importer.unload()
sys.meta_path.remove(importer)

sim_objects = m5.SimObject.allClasses
all_enums = m5.params.allEnums

for name,obj in sorted(sim_objects.iteritems()):
    for param in obj._params.local.values():
        # load the ptype attribute now because it depends on the
        # current version of SimObject.allClasses, but when scons
        # actually uses the value, all versions of
        # SimObject.allClasses will have been loaded
        param.ptype

########################################################################
#
# calculate extra dependencies
#
module_depends = ["m5", "m5.SimObject", "m5.params"]
depends = [ PySource.modules[dep].snode for dep in module_depends ]
depends.sort(key = lambda x: x.name)

########################################################################
#
# Commands for the basic automatically generated python files
#

# Generate Python file containing a dict specifying the current
# buildEnv flags.
def makeDefinesPyFile(target, source, env):
    build_env = source[0].get_contents()

    code = code_formatter()
    code("""
import _m5.core
import m5.util

buildEnv = m5.util.SmartDict($build_env)

compileDate = _m5.core.compileDate
_globals = globals()
for key,val in _m5.core.__dict__.iteritems():
    if key.startswith('flag_'):
        flag = key[5:]
        _globals[flag] = val
del _globals
""")
    code.write(target[0].abspath)

defines_info = Value(build_env)
# Generate a file with all of the compile options in it
env.Command('python/m5/defines.py', defines_info,
            MakeAction(makeDefinesPyFile, Transform("DEFINES", 0)))
PySource('m5', 'python/m5/defines.py')

# Generate python file containing info about the M5 source code
def makeInfoPyFile(target, source, env):
    code = code_formatter()
    for src in source:
        data = ''.join(file(src.srcnode().abspath, 'r').xreadlines())
        code('$src = ${{repr(data)}}')
    code.write(str(target[0]))

# Generate a file that wraps the basic top level files
env.Command('python/m5/info.py',
            [ '#/COPYING', '#/LICENSE', '#/README', ],
            MakeAction(makeInfoPyFile, Transform("INFO")))
PySource('m5', 'python/m5/info.py')

########################################################################
#
# Create all of the SimObject param headers and enum headers
#

def createSimObjectParamStruct(target, source, env):
    assert len(target) == 1 and len(source) == 1

    name = source[0].get_text_contents()
    obj = sim_objects[name]

    code = code_formatter()
    obj.cxx_param_decl(code)
    code.write(target[0].abspath)

def createSimObjectCxxConfig(is_header):
    def body(target, source, env):
        assert len(target) == 1 and len(source) == 1

        name = str(source[0].get_contents())
        obj = sim_objects[name]

        code = code_formatter()
        obj.cxx_config_param_file(code, is_header)
        code.write(target[0].abspath)
    return body

def createEnumStrings(target, source, env):
    assert len(target) == 1 and len(source) == 2

    name = source[0].get_text_contents()
    use_python = source[1].read()
    obj = all_enums[name]

    code = code_formatter()
    obj.cxx_def(code)
    if use_python:
        obj.pybind_def(code)
    code.write(target[0].abspath)

def createEnumDecls(target, source, env):
    assert len(target) == 1 and len(source) == 1

    name = source[0].get_text_contents()
    obj = all_enums[name]

    code = code_formatter()
    obj.cxx_decl(code)
    code.write(target[0].abspath)

def createSimObjectPyBindWrapper(target, source, env):
    name = source[0].get_text_contents()
    obj = sim_objects[name]

    code = code_formatter()
    obj.pybind_decl(code)
    code.write(target[0].abspath)

# Generate all of the SimObject param C++ struct header files
params_hh_files = []
for name,simobj in sorted(sim_objects.iteritems()):
    py_source = PySource.modules[simobj.__module__]
    extra_deps = [ py_source.tnode ]

    hh_file = File('params/%s.hh' % name)
    params_hh_files.append(hh_file)
    env.Command(hh_file, Value(name),
                MakeAction(createSimObjectParamStruct, Transform("SO PARAM")))
    env.Depends(hh_file, depends + extra_deps)

# C++ parameter description files
if GetOption('with_cxx_config'):
    for name,simobj in sorted(sim_objects.iteritems()):
        py_source = PySource.modules[simobj.__module__]
        extra_deps = [ py_source.tnode ]

        cxx_config_hh_file = File('cxx_config/%s.hh' % name)
        cxx_config_cc_file = File('cxx_config/%s.cc' % name)
        env.Command(cxx_config_hh_file, Value(name),
                    MakeAction(createSimObjectCxxConfig(True),
                    Transform("CXXCPRHH")))
        env.Command(cxx_config_cc_file, Value(name),
                    MakeAction(createSimObjectCxxConfig(False),
                    Transform("CXXCPRCC")))
        env.Depends(cxx_config_hh_file, depends + extra_deps +
                    [File('params/%s.hh' % name), File('sim/cxx_config.hh')])
        env.Depends(cxx_config_cc_file, depends + extra_deps +
                    [cxx_config_hh_file])
        Source(cxx_config_cc_file)

    cxx_config_init_cc_file = File('cxx_config/init.cc')

    def createCxxConfigInitCC(target, source, env):
        assert len(target) == 1 and len(source) == 1

        code = code_formatter()

        for name,simobj in sorted(sim_objects.iteritems()):
            if not hasattr(simobj, 'abstract') or not simobj.abstract:
                code('#include "cxx_config/${name}.hh"')
        code()
        code('void cxxConfigInit()')
        code('{')
        code.indent()
        for name,simobj in sorted(sim_objects.iteritems()):
            not_abstract = not hasattr(simobj, 'abstract') or \
                not simobj.abstract
            if not_abstract and 'type' in simobj.__dict__:
                code('cxx_config_directory["${name}"] = '
                     '${name}CxxConfigParams::makeDirectoryEntry();')
        code.dedent()
        code('}')
        code.write(target[0].abspath)

    py_source = PySource.modules[simobj.__module__]
    extra_deps = [ py_source.tnode ]
    env.Command(cxx_config_init_cc_file, Value(name),
        MakeAction(createCxxConfigInitCC, Transform("CXXCINIT")))
    cxx_param_hh_files = ["cxx_config/%s.hh" % simobj
        for name,simobj in sorted(sim_objects.iteritems())
        if not hasattr(simobj, 'abstract') or not simobj.abstract]
    Depends(cxx_config_init_cc_file, cxx_param_hh_files +
            [File('sim/cxx_config.hh')])
    Source(cxx_config_init_cc_file)

# Generate all enum header files
for name,enum in sorted(all_enums.iteritems()):
    py_source = PySource.modules[enum.__module__]
    extra_deps = [ py_source.tnode ]

    cc_file = File('enums/%s.cc' % name)
    env.Command(cc_file, [Value(name), Value(env['USE_PYTHON'])],
                MakeAction(createEnumStrings, Transform("ENUM STR")))
    env.Depends(cc_file, depends + extra_deps)
    Source(cc_file)

    hh_file = File('enums/%s.hh' % name)
    env.Command(hh_file, Value(name),
                MakeAction(createEnumDecls, Transform("ENUMDECL")))
    env.Depends(hh_file, depends + extra_deps)

# Generate SimObject Python bindings wrapper files
if env['USE_PYTHON']:
    for name,simobj in sorted(sim_objects.iteritems()):
        py_source = PySource.modules[simobj.__module__]
        extra_deps = [ py_source.tnode ]
        cc_file = File('python/_m5/param_%s.cc' % name)
        env.Command(cc_file, Value(name),
                    MakeAction(createSimObjectPyBindWrapper,
                               Transform("SO PyBind")))
        env.Depends(cc_file, depends + extra_deps)
        Source(cc_file)

# Build all protocol buffers if we have got protoc and protobuf available
if env['HAVE_PROTOBUF']:
    for proto in ProtoBuf.all:
        # Use both the source and header as the target, and the .proto
        # file as the source. When executing the protoc compiler, also
        # specify the proto_path to avoid having the generated files
        # include the path.
        env.Command([proto.cc_file, proto.hh_file], proto.tnode,
                    MakeAction('$PROTOC --cpp_out ${TARGET.dir} '
                               '--proto_path ${SOURCE.dir} $SOURCE',
                               Transform("PROTOC")))

        # Add the C++ source file
        Source(proto.cc_file, tags=proto.tags)
elif ProtoBuf.all:
    print 'Got protobuf to build, but lacks support!'
    Exit(1)

#
# Handle debug flags
#
def makeDebugFlagCC(target, source, env):
    assert(len(target) == 1 and len(source) == 1)

    code = code_formatter()

    # delay definition of CompoundFlags until after all the definition
    # of all constituent SimpleFlags
    comp_code = code_formatter()

    # file header
    code('''
/*
 * DO NOT EDIT THIS FILE! Automatically generated by SCons.
 */

#include "base/debug.hh"

namespace Debug {

''')

    for name, flag in sorted(source[0].read().iteritems()):
        n, compound, desc = flag
        assert n == name

        if not compound:
            code('SimpleFlag $name("$name", "$desc");')
        else:
            comp_code('CompoundFlag $name("$name", "$desc",')
            comp_code.indent()
            last = len(compound) - 1
            for i,flag in enumerate(compound):
                if i != last:
                    comp_code('&$flag,')
                else:
                    comp_code('&$flag);')
            comp_code.dedent()

    code.append(comp_code)
    code()
    code('} // namespace Debug')

    code.write(str(target[0]))

def makeDebugFlagHH(target, source, env):
    assert(len(target) == 1 and len(source) == 1)

    val = eval(source[0].get_contents())
    name, compound, desc = val

    code = code_formatter()

    # file header boilerplate
    code('''\
/*
 * DO NOT EDIT THIS FILE! Automatically generated by SCons.
 */

#ifndef __DEBUG_${name}_HH__
#define __DEBUG_${name}_HH__

namespace Debug {
''')

    if compound:
        code('class CompoundFlag;')
    code('class SimpleFlag;')

    if compound:
        code('extern CompoundFlag $name;')
        for flag in compound:
            code('extern SimpleFlag $flag;')
    else:
        code('extern SimpleFlag $name;')

    code('''
}

#endif // __DEBUG_${name}_HH__
''')

    code.write(str(target[0]))

for name,flag in sorted(debug_flags.iteritems()):
    n, compound, desc = flag
    assert n == name

    hh_file = 'debug/%s.hh' % name
    env.Command(hh_file, Value(flag),
                MakeAction(makeDebugFlagHH, Transform("TRACING", 0)))

env.Command('debug/flags.cc', Value(debug_flags),
            MakeAction(makeDebugFlagCC, Transform("TRACING", 0)))
Source('debug/flags.cc')

# version tags
tags = \
env.Command('sim/tags.cc', None,
            MakeAction('util/cpt_upgrader.py --get-cc-file > $TARGET',
                       Transform("VER TAGS")))
env.AlwaysBuild(tags)

# Embed python files.  All .py files that have been indicated by a
# PySource() call in a SConscript need to be embedded into the M5
# library.  To do that, we compile the file to byte code, marshal the
# byte code, compress it, and then generate a c++ file that
# inserts the result into an array.
def embedPyFile(target, source, env):
    def c_str(string):
        if string is None:
            return "0"
        return '"%s"' % string

    '''Action function to compile a .py into a code object, marshal
    it, compress it, and stick it into an asm file so the code appears
    as just bytes with a label in the data section'''

    src = file(str(source[0]), 'r').read()

    pysource = PySource.tnodes[source[0]]
    compiled = compile(src, pysource.abspath, 'exec')
    marshalled = marshal.dumps(compiled)
    compressed = zlib.compress(marshalled)
    data = compressed
    sym = pysource.symname

    code = code_formatter()
    code('''\
#include "sim/init.hh"

namespace {

const uint8_t data_${sym}[] = {
''')
    code.indent()
    step = 16
    for i in xrange(0, len(data), step):
        x = array.array('B', data[i:i+step])
        code(''.join('%d,' % d for d in x))
    code.dedent()

    code('''};

EmbeddedPython embedded_${sym}(
    ${{c_str(pysource.arcname)}},
    ${{c_str(pysource.abspath)}},
    ${{c_str(pysource.modpath)}},
    data_${sym},
    ${{len(data)}},
    ${{len(marshalled)}});

} // anonymous namespace
''')
    code.write(str(target[0]))

for source in PySource.all:
    env.Command(source.cpp, source.tnode,
                MakeAction(embedPyFile, Transform("EMBED PY")))
    Source(source.cpp, tags=source.tags, add_tags='python')

########################################################################
#
# Define binaries.  Each different build type (debug, opt, etc.) gets
# a slightly different build environment.
#

# List of constructed environments to pass back to SConstruct
date_source = Source('base/date.cc', tags=[])

# Function to create a new build environment as clone of current
# environment 'env' with modified object suffix and optional stripped
# binary.  Additional keyword arguments are appended to corresponding
# build environment vars.
def makeEnv(env, label, objsfx, strip=False, disable_partial=False, **kwargs):
    # SCons doesn't know to append a library suffix when there is a '.' in the
    # name.  Use '_' instead.
    libname = 'gem5_' + label
    exename = 'gem5.' + label
    secondary_exename = 'm5.' + label

    new_env = env.Clone(OBJSUFFIX=objsfx, SHOBJSUFFIX=objsfx + 's')
    new_env.Label = label
    new_env.Append(**kwargs)

    lib_sources = Source.all.with_tag('gem5 lib')

    # Without Python, leave out all Python content from the library
    # builds.  The option doesn't affect gem5 built as a program
    if GetOption('without_python'):
        lib_sources = lib_sources.without_tag('python')

    static_objs = []
    shared_objs = []

    for s in lib_sources.with_tag(Source.ungrouped_tag):
        static_objs.append(s.static(new_env))
        shared_objs.append(s.shared(new_env))

    for group in Source.source_groups:
        srcs = lib_sources.with_tag(Source.link_group_tag(group))
        if not srcs:
            continue

        group_static = [ s.static(new_env) for s in srcs ]
        group_shared = [ s.shared(new_env) for s in srcs ]

        # If partial linking is disabled, add these sources to the build
        # directly, and short circuit this loop.
        if disable_partial:
            static_objs.extend(group_static)
            shared_objs.extend(group_shared)
            continue

        # Set up the static partially linked objects.
        file_name = new_env.subst("${OBJPREFIX}lib${OBJSUFFIX}.partial")
        target = File(joinpath(group, file_name))
        partial = env.PartialStatic(target=target, source=group_static)
        static_objs.extend(partial)

        # Set up the shared partially linked objects.
        file_name = new_env.subst("${SHOBJPREFIX}lib${SHOBJSUFFIX}.partial")
        target = File(joinpath(group, file_name))
        partial = env.PartialShared(target=target, source=group_shared)
        shared_objs.extend(partial)

    static_date = date_source.static(new_env)
    new_env.Depends(static_date, static_objs)
    static_objs.extend(static_date)

    shared_date = date_source.shared(new_env)
    new_env.Depends(shared_date, shared_objs)
    shared_objs.extend(shared_date)

    # First make a library of everything but main() so other programs can
    # link against m5.
    static_lib = new_env.StaticLibrary(libname, static_objs)
    shared_lib = new_env.SharedLibrary(libname, shared_objs)

    # Now link a stub with main() and the static library.
    main_objs = [ s.static(new_env) for s in Source.all.with_tag('main') ]

    for test in UnitTest.all:
        test_sources = Source.all.with_tag(str(test.target))
        test_objs = [ s.static(new_env) for s in test_sources ]
        if test.main:
            test_objs += main_objs
        path = 'unittest/%s.%s' % (test.target, label)
        new_env.Program(path, test_objs + static_objs)

    gtest_env = new_env.Clone()
    gtest_env.Append(LIBS=gtest_env['GTEST_LIBS'])
    gtest_env.Append(CPPFLAGS=gtest_env['GTEST_CPPFLAGS'])
    for test in GTest.all:
        test_sources = Source.all.with_tag(str(test.target))
        test_objs = [ s.static(gtest_env) for s in test_sources ]
        gtest_env.Program(test.dir.File('%s.%s' % (test.target, label)),
                          test_objs)

    progname = exename
    if strip:
        progname += '.unstripped'

    targets = new_env.Program(progname, main_objs + static_objs)

    if strip:
        if sys.platform == 'sunos5':
            cmd = 'cp $SOURCE $TARGET; strip $TARGET'
        else:
            cmd = 'strip $SOURCE -o $TARGET'
        targets = new_env.Command(exename, progname,
                    MakeAction(cmd, Transform("STRIP")))

    new_env.Command(secondary_exename, exename,
            MakeAction('ln $SOURCE $TARGET', Transform("HARDLINK")))

    new_env.M5Binary = targets[0]

    # Set up regression tests.
    SConscript(os.path.join(env.root.abspath, 'tests', 'SConscript'),
               variant_dir=Dir('tests').Dir(new_env.Label),
               exports={ 'env' : new_env }, duplicate=False)

# Start out with the compiler flags common to all compilers,
# i.e. they all use -g for opt and -g -pg for prof
ccflags = {'debug' : [], 'opt' : ['-g'], 'fast' : [], 'prof' : ['-g', '-pg'],
           'perf' : ['-g']}

# Start out with the linker flags common to all linkers, i.e. -pg for
# prof, and -lprofiler for perf. The -lprofile flag is surrounded by
# no-as-needed and as-needed as the binutils linker is too clever and
# simply doesn't link to the library otherwise.
ldflags = {'debug' : [], 'opt' : [], 'fast' : [], 'prof' : ['-pg'],
           'perf' : ['-Wl,--no-as-needed', '-lprofiler', '-Wl,--as-needed']}

# For Link Time Optimization, the optimisation flags used to compile
# individual files are decoupled from those used at link time
# (i.e. you can compile with -O3 and perform LTO with -O0), so we need
# to also update the linker flags based on the target.
if env['GCC']:
    if sys.platform == 'sunos5':
        ccflags['debug'] += ['-gstabs+']
    else:
        ccflags['debug'] += ['-ggdb3']
    ldflags['debug'] += ['-O0']
    # opt, fast, prof and perf all share the same cc flags, also add
    # the optimization to the ldflags as LTO defers the optimization
    # to link time
    for target in ['opt', 'fast', 'prof', 'perf']:
        ccflags[target] += ['-O3']
        ldflags[target] += ['-O3']

    ccflags['fast'] += env['LTO_CCFLAGS']
    ldflags['fast'] += env['LTO_LDFLAGS']
elif env['CLANG']:
    ccflags['debug'] += ['-g', '-O0']
    # opt, fast, prof and perf all share the same cc flags
    for target in ['opt', 'fast', 'prof', 'perf']:
        ccflags[target] += ['-O3']
else:
    print 'Unknown compiler, please fix compiler options'
    Exit(1)


# To speed things up, we only instantiate the build environments we
# need.  We try to identify the needed environment for each target; if
# we can't, we fall back on instantiating all the environments just to
# be safe.
target_types = ['debug', 'opt', 'fast', 'prof', 'perf']
obj2target = {'do': 'debug', 'o': 'opt', 'fo': 'fast', 'po': 'prof',
              'gpo' : 'perf'}

def identifyTarget(t):
    ext = t.split('.')[-1]
    if ext in target_types:
        return ext
    if obj2target.has_key(ext):
        return obj2target[ext]
    match = re.search(r'/tests/([^/]+)/', t)
    if match and match.group(1) in target_types:
        return match.group(1)
    return 'all'

needed_envs = [identifyTarget(target) for target in BUILD_TARGETS]
if 'all' in needed_envs:
    needed_envs += target_types

# Debug binary
if 'debug' in needed_envs:
    makeEnv(env, 'debug', '.do',
            CCFLAGS = Split(ccflags['debug']),
            CPPDEFINES = ['DEBUG', 'TRACING_ON=1'],
            LINKFLAGS = Split(ldflags['debug']))

# Optimized binary
if 'opt' in needed_envs:
    makeEnv(env, 'opt', '.o',
            CCFLAGS = Split(ccflags['opt']),
            CPPDEFINES = ['TRACING_ON=1'],
            LINKFLAGS = Split(ldflags['opt']))

# "Fast" binary
if 'fast' in needed_envs:
    disable_partial = \
            env.get('BROKEN_INCREMENTAL_LTO', False) and \
            GetOption('force_lto')
    makeEnv(env, 'fast', '.fo', strip = True,
            CCFLAGS = Split(ccflags['fast']),
            CPPDEFINES = ['NDEBUG', 'TRACING_ON=0'],
            LINKFLAGS = Split(ldflags['fast']),
            disable_partial=disable_partial)

# Profiled binary using gprof
if 'prof' in needed_envs:
    makeEnv(env, 'prof', '.po',
            CCFLAGS = Split(ccflags['prof']),
            CPPDEFINES = ['NDEBUG', 'TRACING_ON=0'],
            LINKFLAGS = Split(ldflags['prof']))

# Profiled binary using google-pprof
if 'perf' in needed_envs:
    makeEnv(env, 'perf', '.gpo',
            CCFLAGS = Split(ccflags['perf']),
            CPPDEFINES = ['NDEBUG', 'TRACING_ON=0'],
            LINKFLAGS = Split(ldflags['perf']))