aboutsummaryrefslogtreecommitdiffstats
path: root/build/scripts/go_tool.py
blob: 7ee15502413ca800dfe231aac1371d2d30acaa0d (plain) (blame)
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
from __future__ import absolute_import, unicode_literals
import argparse
import copy
import json
import os
import re
import shutil
import subprocess
import sys
import tarfile
import tempfile
import threading
import six
from functools import reduce

import process_command_files as pcf
import process_whole_archive_option as pwa

arc_project_prefix = 'a.yandex-team.ru/'
std_lib_prefix = 'contrib/go/_std/src/'
vendor_prefix = 'vendor/'
vet_info_ext = '.vet.out'
vet_report_ext = '.vet.txt'

FIXED_CGO1_SUFFIX='.fixed.cgo1.go'

COMPILE_OPTIMIZATION_FLAGS=('-N',)


def get_trimpath_args(args):
    return ['-trimpath', args.trimpath] if args.trimpath else []


def preprocess_cgo1(src_path, dst_path, source_root):
    with open(src_path, 'r') as f:
        content = f.read()
        content = content.replace('__ARCADIA_SOURCE_ROOT_PREFIX__', source_root)
    with open(dst_path, 'w') as f:
        f.write(content)


def preprocess_args(args):
    # Temporary work around for noauto
    if args.cgo_srcs and len(args.cgo_srcs) > 0:
        cgo_srcs_set = set(args.cgo_srcs)
        args.srcs = [x for x in args.srcs if x not in cgo_srcs_set]

    args.pkg_root = os.path.join(args.toolchain_root, 'pkg')
    toolchain_tool_root = os.path.join(args.pkg_root, 'tool', '{}_{}'.format(args.host_os, args.host_arch))
    args.go_compile = os.path.join(toolchain_tool_root, 'compile')
    args.go_cgo = os.path.join(toolchain_tool_root, 'cgo')
    args.go_link = os.path.join(toolchain_tool_root, 'link')
    args.go_asm = os.path.join(toolchain_tool_root, 'asm')
    args.go_pack = os.path.join(toolchain_tool_root, 'pack')
    args.go_vet = os.path.join(toolchain_tool_root, 'vet') if args.vet is True else args.vet
    args.output = os.path.normpath(args.output)
    args.vet_report_output = vet_report_output_name(args.output, args.vet_report_ext)
    args.trimpath = None
    if args.debug_root_map:
        roots = {'build': args.build_root, 'source': args.source_root, 'tools': args.tools_root}
        replaces = []
        for root in args.debug_root_map.split(';'):
            src, dst = root.split('=', 1)
            assert src in roots
            replaces.append('{}=>{}'.format(roots[src], dst))
            del roots[src]
        assert len(replaces) > 0
        args.trimpath = ';'.join(replaces)
    args.build_root = os.path.normpath(args.build_root)
    args.build_root_dir = args.build_root + os.path.sep
    args.source_root = os.path.normpath(args.source_root)
    args.source_root_dir = args.source_root + os.path.sep
    args.output_root = os.path.normpath(args.output_root)
    args.import_map = {}
    args.module_map = {}
    if args.cgo_peers:
        args.cgo_peers = [x for x in args.cgo_peers if not x.endswith('.fake.pkg')]

    srcs = []
    for f in args.srcs:
        if f.endswith('.gosrc'):
            with tarfile.open(f, 'r') as tar:
                srcs.extend(os.path.join(args.output_root, src) for src in tar.getnames())
                tar.extractall(path=args.output_root)
        else:
            srcs.append(f)
    args.srcs = srcs

    assert args.mode == 'test' or args.test_srcs is None and args.xtest_srcs is None
    # add lexical oreder by basename for go sources
    args.srcs.sort(key=lambda x: os.path.basename(x))
    if args.test_srcs:
        args.srcs += sorted(args.test_srcs, key=lambda x: os.path.basename(x))
        del args.test_srcs
    if args.xtest_srcs:
        args.xtest_srcs.sort(key=lambda x: os.path.basename(x))

    # compute root relative module dir path
    assert args.output is None or args.output_root == os.path.dirname(args.output)
    assert args.output_root.startswith(args.build_root_dir)
    args.module_path = args.output_root[len(args.build_root_dir):]
    args.source_module_dir = os.path.join(args.source_root, args.test_import_path or args.module_path) + os.path.sep
    assert len(args.module_path) > 0
    args.import_path, args.is_std = get_import_path(args.module_path)

    assert args.asmhdr is None or args.word == 'go'

    srcs = []
    for f in args.srcs:
        if f.endswith(FIXED_CGO1_SUFFIX) and f.startswith(args.build_root_dir):
            path = os.path.join(args.output_root, '{}.cgo1.go'.format(os.path.basename(f[:-len(FIXED_CGO1_SUFFIX)])))
            srcs.append(path)
            preprocess_cgo1(f, path, args.source_root)
        else:
            srcs.append(f)
    args.srcs = srcs

    if args.extldflags:
        args.extldflags = pwa.ProcessWholeArchiveOption(args.targ_os).construct_cmd(args.extldflags)

    classify_srcs(args.srcs, args)


def compare_versions(version1, version2):
    def last_index(version):
        index = version.find('beta')
        return len(version) if index < 0 else index

    v1 = tuple(x.zfill(8) for x in version1[:last_index(version1)].split('.'))
    v2 = tuple(x.zfill(8) for x in version2[:last_index(version2)].split('.'))
    if v1 == v2:
        return 0
    return 1 if v1 < v2 else -1


def get_symlink_or_copyfile():
    os_symlink = getattr(os, 'symlink', None)
    if os_symlink is None:
        os_symlink = shutil.copyfile
    return os_symlink


def copy_args(args):
    return copy.copy(args)


def get_vendor_index(import_path):
    index = import_path.rfind('/' + vendor_prefix)
    if index < 0:
        index = 0 if import_path.startswith(vendor_prefix) else index
    else:
        index = index + 1
    return index


def get_import_path(module_path):
    assert len(module_path) > 0
    import_path = module_path.replace('\\', '/')
    is_std_module = import_path.startswith(std_lib_prefix)
    if is_std_module:
        import_path = import_path[len(std_lib_prefix):]
    elif import_path.startswith(vendor_prefix):
        import_path = import_path[len(vendor_prefix):]
    else:
        import_path = arc_project_prefix + import_path
    assert len(import_path) > 0
    return import_path, is_std_module


def call(cmd, cwd, env=None):
    # sys.stderr.write('{}\n'.format(' '.join(cmd)))
    return subprocess.check_output(cmd, stdin=None, stderr=subprocess.STDOUT, cwd=cwd, env=env)


def classify_srcs(srcs, args):
    args.go_srcs = [x for x in srcs if x.endswith('.go')]
    args.asm_srcs = [x for x in srcs if x.endswith('.s')]
    args.objects = [x for x in srcs if x.endswith('.o') or x.endswith('.obj')]
    args.symabis = [x for x in srcs if x.endswith('.symabis')]
    args.sysos = [x for x in srcs if x.endswith('.syso')]


def get_import_config_info(peers, gen_importmap, import_map={}, module_map={}):
    info = {'importmap': [], 'packagefile': [], 'standard': {}}
    if gen_importmap:
        for key, value in six.iteritems(import_map):
            info['importmap'].append((key, value))
    for peer in peers:
        peer_import_path, is_std = get_import_path(os.path.dirname(peer))
        if gen_importmap:
            index = get_vendor_index(peer_import_path)
            if index >= 0:
                index += len(vendor_prefix)
                info['importmap'].append((peer_import_path[index:], peer_import_path))
        info['packagefile'].append((peer_import_path, os.path.join(args.build_root, peer)))
        if is_std:
            info['standard'][peer_import_path] = True
    for key, value in six.iteritems(module_map):
        info['packagefile'].append((key, value))
    return info


def create_import_config(peers, gen_importmap, import_map={}, module_map={}):
    lines = []
    info = get_import_config_info(peers, gen_importmap, import_map, module_map)
    for key in ('importmap', 'packagefile'):
        for item in info[key]:
            lines.append('{} {}={}'.format(key, *item))
    if len(lines) > 0:
        lines.append('')
        content = '\n'.join(lines)
        # sys.stderr.writelines('{}\n'.format(l) for l in lines)
        with tempfile.NamedTemporaryFile(delete=False) as f:
            f.write(content.encode('UTF-8'))
            return f.name
    return None


def create_embed_config(args):
    data = {
        'Patterns': {},
        'Files': {},
    }
    for info in args.embed:
        pattern = info[0]
        if pattern.endswith('/**/*'):
            pattern = pattern[:-3]
        files = {os.path.relpath(f, args.source_module_dir).replace('\\', '/'): f for f in info[1:]}
        data['Patterns'][pattern] = list(files.keys())
        data['Files'].update(files)
    # sys.stderr.write('{}\n'.format(json.dumps(data, indent=4)))
    with tempfile.NamedTemporaryFile(delete=False, suffix='.embedcfg') as f:
        f.write(json.dumps(data).encode('UTF-8'))
        return f.name


def vet_info_output_name(path, ext=None):
    return '{}{}'.format(path, ext or vet_info_ext)


def vet_report_output_name(path, ext=None):
    return '{}{}'.format(path, ext or vet_report_ext)


def get_source_path(args):
    return args.test_import_path or args.module_path


def gen_vet_info(args):
    import_path = args.real_import_path if hasattr(args, 'real_import_path') else args.import_path
    info = get_import_config_info(args.peers, True, args.import_map, args.module_map)

    import_map = dict(info['importmap'])
    # FIXME(snermolaev): it seems that adding import map for 'fake' package
    #                    does't make any harm (it needs to be revised later)
    import_map['unsafe'] = 'unsafe'

    for (key, _) in info['packagefile']:
        if key not in import_map:
            import_map[key] = key

    data = {
        'ID': import_path,
        'Compiler': 'gc',
        'Dir': os.path.join(args.source_root, get_source_path(args)),
        'ImportPath': import_path,
        'GoFiles': [x for x in args.go_srcs if x.endswith('.go')],
        'NonGoFiles': [x for x in args.go_srcs if not x.endswith('.go')],
        'ImportMap': import_map,
        'PackageFile': dict(info['packagefile']),
        'Standard': dict(info['standard']),
        'PackageVetx': dict((key, vet_info_output_name(value)) for key, value in info['packagefile']),
        'VetxOnly': False,
        'VetxOutput': vet_info_output_name(args.output),
        'SucceedOnTypecheckFailure': False
    }
    # sys.stderr.write('{}\n'.format(json.dumps(data, indent=4)))
    return data


def create_vet_config(args, info):
    with tempfile.NamedTemporaryFile(delete=False, suffix='.cfg') as f:
        f.write(json.dumps(info).encode('UTF-8'))
        return f.name


def decode_vet_report(json_report):
    report = ''
    if json_report:
        try:
            full_diags = json.JSONDecoder().decode(json_report.decode('UTF-8'))
        except ValueError:
            report = json_report
        else:
            messages = []
            for _, module_diags in six.iteritems(full_diags):
                for _, type_diags in six.iteritems(module_diags):
                    for diag in type_diags:
                        messages.append('{}: {}'.format(diag['posn'], json.dumps(diag['message'])))
            report = '\n'.join(messages)

    return report


def dump_vet_report(args, report):
    if report:
        report = report.replace(args.build_root, '$B')
        report = report.replace(args.source_root, '$S')
    with open(args.vet_report_output, 'w') as f:
        f.write(report)


def read_vet_report(args):
    assert args
    report = ''
    if os.path.exists(args.vet_report_output):
        with open(args.vet_report_output, 'r') as f:
            report += f.read()
    return report


def dump_vet_report_for_tests(args, *test_args_list):
    dump_vet_report(args, reduce(lambda x, y: x + read_vet_report(y), [_f for _f in test_args_list if _f], ''))


def do_vet(args):
    assert args.vet
    info = gen_vet_info(args)
    vet_config = create_vet_config(args, info)
    cmd = [args.go_vet, '-json']
    if args.vet_flags:
        cmd.extend(args.vet_flags)
    cmd.append(vet_config)
    # sys.stderr.write('>>>> [{}]\n'.format(' '.join(cmd)))
    p_vet = subprocess.Popen(cmd, stdin=None, stderr=subprocess.PIPE, stdout=subprocess.PIPE, cwd=args.source_root)
    vet_out, vet_err = p_vet.communicate()
    report = decode_vet_report(vet_out) if vet_out else ''
    dump_vet_report(args, report)
    if p_vet.returncode:
        raise subprocess.CalledProcessError(returncode=p_vet.returncode, cmd=cmd, output=vet_err)


def _do_compile_go(args):
    import_path, is_std_module = args.import_path, args.is_std
    cmd = [
        args.go_compile,
        '-o',
        args.output,
        '-p',
        import_path,
        '-D',
        '""',
        '-goversion',
        'go{}'.format(args.goversion)
    ]
    cmd.extend(get_trimpath_args(args))
    compiling_runtime = False
    if is_std_module:
        cmd.append('-std')
        if import_path in ('runtime', 'internal/abi', 'internal/bytealg', 'internal/cpu') or import_path.startswith('runtime/internal/'):
            cmd.append('-+')
            compiling_runtime = True
    import_config_name = create_import_config(args.peers, True, args.import_map, args.module_map)
    if import_config_name:
        cmd += ['-importcfg', import_config_name]
    else:
        if import_path == 'unsafe' or len(args.objects) > 0 or args.asmhdr:
            pass
        else:
            cmd.append('-complete')
    # if compare_versions('1.16', args.goversion) >= 0:
    if args.embed:
        embed_config_name = create_embed_config(args)
        cmd.extend(['-embedcfg', embed_config_name])
    if args.asmhdr:
        cmd += ['-asmhdr', args.asmhdr]
    # Use .symabis (starting from 1.12 version)
    if args.symabis:
        cmd += ['-symabis'] + args.symabis
    # If 1.12 <= version < 1.13 we have to pass -allabis for 'runtime' and 'runtime/internal/atomic'
    # if compare_versions('1.13', args.goversion) >= 0:
    #     pass
    # elif import_path in ('runtime', 'runtime/internal/atomic'):
    #     cmd.append('-allabis')
    compile_workers = '4'
    if args.compile_flags:
        if compiling_runtime:
            cmd.extend(x for x in args.compile_flags if x not in COMPILE_OPTIMIZATION_FLAGS)
        else:
            cmd.extend(args.compile_flags)
        if any([x in ('-race', '-shared') for x in args.compile_flags]):
            compile_workers = '1'
    cmd += ['-pack', '-c={}'.format(compile_workers)]
    cmd += args.go_srcs
    call(cmd, args.build_root)


class VetThread(threading.Thread):

    def __init__(self, target, args):
        super(VetThread, self).__init__(target=target, args=args)
        self.exc_info = None

    def run(self):
        try:
            super(VetThread, self).run()
        except:
            self.exc_info = sys.exc_info()

    def join_with_exception(self, reraise_exception):
        self.join()
        if reraise_exception and self.exc_info:
            six.reraise(self.exc_info[0], self.exc_info[1], self.exc_info[2])


def do_compile_go(args):
    raise_exception_from_vet = False
    if args.vet:
        run_vet = VetThread(target=do_vet, args=(args,))
        run_vet.start()
    try:
        _do_compile_go(args)
        raise_exception_from_vet = True
    finally:
        if args.vet:
            run_vet.join_with_exception(raise_exception_from_vet)


def do_compile_asm(args):
    def need_compiling_runtime(import_path):
        return import_path in ('runtime', 'reflect', 'syscall') or \
            import_path.startswith('runtime/internal/') or \
            compare_versions('1.17', args.goversion) >= 0 and import_path == 'internal/bytealg'

    assert(len(args.srcs) == 1 and len(args.asm_srcs) == 1)
    cmd = [args.go_asm]
    cmd += get_trimpath_args(args)
    cmd += ['-I', args.output_root, '-I', os.path.join(args.pkg_root, 'include')]
    cmd += ['-D', 'GOOS_' + args.targ_os, '-D', 'GOARCH_' + args.targ_arch, '-o', args.output]

    # if compare_versions('1.16', args.goversion) >= 0:
    cmd += ['-p', args.import_path]
    if need_compiling_runtime(args.import_path):
        cmd += ['-compiling-runtime']

    if args.asm_flags:
        cmd += args.asm_flags
    cmd += args.asm_srcs
    call(cmd, args.build_root)


def do_link_lib(args):
    if len(args.asm_srcs) > 0:
        asmargs = copy_args(args)
        asmargs.asmhdr = os.path.join(asmargs.output_root, 'go_asm.h')
        do_compile_go(asmargs)
        for src in asmargs.asm_srcs:
            asmargs.srcs = [src]
            asmargs.asm_srcs = [src]
            asmargs.output = os.path.join(asmargs.output_root, os.path.basename(src) + '.o')
            do_compile_asm(asmargs)
            args.objects.append(asmargs.output)
    else:
        do_compile_go(args)
    if args.objects or args.sysos:
        cmd = [args.go_pack, 'r', args.output] + args.objects + args.sysos
        call(cmd, args.build_root)


def do_link_exe(args):
    assert args.extld is not None
    assert args.non_local_peers is not None
    compile_args = copy_args(args)
    compile_args.output = os.path.join(args.output_root, 'main.a')
    compile_args.real_import_path = compile_args.import_path
    compile_args.import_path = 'main'

    if args.vcs and os.path.isfile(compile_args.vcs):
        build_info = os.path.join('library', 'go', 'core', 'buildinfo')
        if any([x.startswith(build_info) for x in compile_args.peers]):
            compile_args.go_srcs.append(compile_args.vcs)

    do_link_lib(compile_args)
    cmd = [args.go_link, '-o', args.output]
    import_config_name = create_import_config(args.peers + args.non_local_peers, False, args.import_map, args.module_map)
    if import_config_name:
        cmd += ['-importcfg', import_config_name]
    if args.link_flags:
        cmd += args.link_flags

    if args.mode in ('exe', 'test'):
        cmd.append('-buildmode=exe')
    elif args.mode == 'dll':
        cmd.append('-buildmode=c-shared')
    else:
        assert False, 'Unexpected mode: {}'.format(args.mode)
    cmd.append('-extld={}'.format(args.extld))

    extldflags = []
    if args.extldflags is not None:
        filter_musl = bool
        if args.musl:
            cmd.append('-linkmode=external')
            extldflags.append('-static')
            filter_musl = lambda x: x not in ('-lc', '-ldl', '-lm', '-lpthread', '-lrt')
        extldflags += [x for x in args.extldflags if filter_musl(x)]
    cgo_peers = []
    if args.cgo_peers is not None and len(args.cgo_peers) > 0:
        is_group = args.targ_os == 'linux'
        if is_group:
            cgo_peers.append('-Wl,--start-group')
        cgo_peers.extend(args.cgo_peers)
        if is_group:
            cgo_peers.append('-Wl,--end-group')
    try:
        index = extldflags.index('--cgo-peers')
        extldflags = extldflags[:index] + cgo_peers + extldflags[index+1:]
    except ValueError:
        extldflags.extend(cgo_peers)
    if len(extldflags) > 0:
        cmd.append('-extldflags={}'.format(' '.join(extldflags)))
    cmd.append(compile_args.output)
    call(cmd, args.build_root)


def gen_cover_info(args):
    lines = []
    lines.extend([
        """
var (
    coverCounters = make(map[string][]uint32)
    coverBlocks = make(map[string][]testing.CoverBlock)
)
        """,
        'func init() {',
    ])
    for var, file in (x.split(':') for x in args.cover_info):
        lines.append('    coverRegisterFile("{file}", _cover0.{var}.Count[:], _cover0.{var}.Pos[:], _cover0.{var}.NumStmt[:])'.format(file=file, var=var))
    lines.extend([
        '}',
        """
func coverRegisterFile(fileName string, counter []uint32, pos []uint32, numStmts []uint16) {
    if 3*len(counter) != len(pos) || len(counter) != len(numStmts) {
        panic("coverage: mismatched sizes")
    }
    if coverCounters[fileName] != nil {
        // Already registered.
        return
    }
    coverCounters[fileName] = counter
    block := make([]testing.CoverBlock, len(counter))
    for i := range counter {
        block[i] = testing.CoverBlock{
            Line0: pos[3*i+0],
            Col0: uint16(pos[3*i+2]),
            Line1: pos[3*i+1],
            Col1: uint16(pos[3*i+2]>>16),
            Stmts: numStmts[i],
        }
    }
    coverBlocks[fileName] = block
}
        """,
    ])
    return lines


def filter_out_skip_tests(tests, skip_tests):
    skip_set = set()
    star_skip_set = set()
    for t in skip_tests:
        work_set = star_skip_set if '*' in t else skip_set
        work_set.add(t)

    re_star_tests = None
    if len(star_skip_set) > 0:
        re_star_tests = re.compile(re.sub(r'(\*)+', r'.\1', '^({})$'.format('|'.join(star_skip_set))))

    return [x for x in tests if not (x in skip_tests or re_star_tests and re_star_tests.match(x))]


def gen_test_main(args, test_lib_args, xtest_lib_args):
    assert args and (test_lib_args or xtest_lib_args)
    test_miner = args.test_miner
    test_module_path = test_lib_args.import_path if test_lib_args else xtest_lib_args.import_path
    is_cover = args.cover_info and len(args.cover_info) > 0

    # Prepare GOPATH
    # $BINDIR
    #    |- __go__
    #        |- src
    #        |- pkg
    #            |- ${TARGET_OS}_${TARGET_ARCH}
    go_path_root = os.path.join(args.output_root, '__go__')
    test_src_dir = os.path.join(go_path_root, 'src')
    target_os_arch = '_'.join([args.targ_os, args.targ_arch])
    test_pkg_dir = os.path.join(go_path_root, 'pkg', target_os_arch, os.path.dirname(test_module_path))
    os.makedirs(test_pkg_dir)

    my_env = os.environ.copy()
    my_env['GOROOT'] = ''
    my_env['GOPATH'] = go_path_root
    my_env['GOARCH'] = args.targ_arch
    my_env['GOOS'] = args.targ_os

    tests = []
    xtests = []
    os_symlink = get_symlink_or_copyfile()

    # Get the list of "internal" tests
    if test_lib_args:
        os.makedirs(os.path.join(test_src_dir, test_module_path))
        os_symlink(test_lib_args.output, os.path.join(test_pkg_dir, os.path.basename(test_module_path) + '.a'))
        cmd = [test_miner, '-benchmarks', '-tests', test_module_path]
        tests = [x for x in (call(cmd, test_lib_args.output_root, my_env).decode('UTF-8') or '').strip().split('\n') if len(x) > 0]
        if args.skip_tests:
            tests = filter_out_skip_tests(tests, args.skip_tests)
    test_main_found = '#TestMain' in tests

    # Get the list of "external" tests
    if xtest_lib_args:
        xtest_module_path = xtest_lib_args.import_path
        os.makedirs(os.path.join(test_src_dir, xtest_module_path))
        os_symlink(xtest_lib_args.output, os.path.join(test_pkg_dir, os.path.basename(xtest_module_path) + '.a'))
        cmd = [test_miner, '-benchmarks', '-tests', xtest_module_path]
        xtests = [x for x in (call(cmd, xtest_lib_args.output_root, my_env).decode('UTF-8') or '').strip().split('\n') if len(x) > 0]
        if args.skip_tests:
            xtests = filter_out_skip_tests(xtests, args.skip_tests)
    xtest_main_found = '#TestMain' in xtests

    test_main_package = None
    if test_main_found and xtest_main_found:
        assert False, 'multiple definition of TestMain'
    elif test_main_found:
        test_main_package = '_test'
    elif xtest_main_found:
        test_main_package = '_xtest'

    shutil.rmtree(go_path_root)

    lines = ['package main', '', 'import (']
    if test_main_package is None:
        lines.append('    "os"')
    lines.extend(['    "testing"', '    "testing/internal/testdeps"'])

    if len(tests) > 0:
        lines.append('    _test "{}"'.format(test_module_path))
    elif test_lib_args:
        lines.append('    _ "{}"'.format(test_module_path))

    if len(xtests) > 0:
        lines.append('    _xtest "{}"'.format(xtest_module_path))
    elif xtest_lib_args:
        lines.append('    _ "{}"'.format(xtest_module_path))

    if is_cover:
        lines.append('    _cover0 "{}"'.format(test_module_path))
    lines.extend([')', ''])

    if compare_versions('1.18', args.goversion) < 0:
        kinds = ['Test', 'Benchmark', 'Example']
    else:
        kinds = ['Test', 'Benchmark', 'FuzzTarget', 'Example']

    var_names = []
    for kind in kinds:
        var_name = '{}s'.format(kind.lower())
        var_names.append(var_name)
        lines.append('var {} = []testing.Internal{}{{'.format(var_name, kind))
        for test in [x for x in tests if x.startswith(kind)]:
            lines.append('    {{"{test}", _test.{test}}},'.format(test=test))
        for test in [x for x in xtests if x.startswith(kind)]:
            lines.append('    {{"{test}", _xtest.{test}}},'.format(test=test))
        lines.extend(['}', ''])

    if is_cover:
        lines.extend(gen_cover_info(args))

    lines.append('func main() {')
    if is_cover:
        lines.extend([
            '    testing.RegisterCover(testing.Cover{',
            '        Mode: "set",',
            '        Counters: coverCounters,',
            '        Blocks: coverBlocks,',
            '        CoveredPackages: "",',
            '    })',
        ])
    lines.extend([
        '    m := testing.MainStart(testdeps.TestDeps{{}}, {})'.format(', '.join(var_names)),
        '',
    ])

    if test_main_package:
        lines.append('    {}.TestMain(m)'.format(test_main_package))
    else:
        lines.append('    os.Exit(m.Run())')
    lines.extend(['}', ''])

    content = '\n'.join(lines)
    # sys.stderr.write('{}\n'.format(content))
    return content


def do_link_test(args):
    assert args.srcs or args.xtest_srcs
    assert args.test_miner is not None

    test_module_path = get_source_path(args)
    test_import_path, _ = get_import_path(test_module_path)

    test_lib_args = copy_args(args) if args.srcs else None
    xtest_lib_args = copy_args(args) if args.xtest_srcs else None
    if xtest_lib_args is not None:
        xtest_lib_args.embed = args.embed_xtest if args.embed_xtest else None

    ydx_file_name = None
    xtest_ydx_file_name = None
    need_append_ydx = test_lib_args and xtest_lib_args and args.ydx_file and args.vet_flags
    if need_append_ydx:
        def find_ydx_file_name(name, flags):
            for i, elem in enumerate(flags):
                if elem.endswith(name):
                    return (i, elem)
            assert False, 'Unreachable code'

        idx, ydx_file_name = find_ydx_file_name(xtest_lib_args.ydx_file, xtest_lib_args.vet_flags)
        xtest_ydx_file_name = '{}_xtest'.format(ydx_file_name)
        xtest_lib_args.vet_flags = copy.copy(xtest_lib_args.vet_flags)
        xtest_lib_args.vet_flags[idx] = xtest_ydx_file_name

    if test_lib_args:
        test_lib_args.output = os.path.join(args.output_root, 'test.a')
        test_lib_args.vet_report_output = vet_report_output_name(test_lib_args.output)
        test_lib_args.module_path = test_module_path
        test_lib_args.import_path = test_import_path
        do_link_lib(test_lib_args)

    if xtest_lib_args:
        xtest_lib_args.srcs = xtest_lib_args.xtest_srcs
        classify_srcs(xtest_lib_args.srcs, xtest_lib_args)
        xtest_lib_args.output = os.path.join(args.output_root, 'xtest.a')
        xtest_lib_args.vet_report_output = vet_report_output_name(xtest_lib_args.output)
        xtest_lib_args.module_path = test_module_path + '_test'
        xtest_lib_args.import_path = test_import_path + '_test'
        if test_lib_args:
            xtest_lib_args.module_map[test_import_path] = test_lib_args.output
        need_append_ydx = args.ydx_file and args.srcs and args.vet_flags
        do_link_lib(xtest_lib_args)

    if need_append_ydx:
        with open(os.path.join(args.build_root, ydx_file_name), 'ab') as dst_file:
            with open(os.path.join(args.build_root, xtest_ydx_file_name), 'rb') as src_file:
                dst_file.write(src_file.read())

    test_main_content = gen_test_main(args, test_lib_args, xtest_lib_args)
    test_main_name = os.path.join(args.output_root, '_test_main.go')
    with open(test_main_name, "w") as f:
        f.write(test_main_content)
    test_args = copy_args(args)
    test_args.embed = None
    test_args.srcs = [test_main_name]
    if test_args.test_import_path is None:
        # it seems that we can do it unconditionally, but this kind
        # of mangling doesn't really looks good to me and we leave it
        # for pure GO_TEST module
        test_args.module_path = test_args.module_path + '___test_main__'
        test_args.import_path = test_args.import_path + '___test_main__'
    classify_srcs(test_args.srcs, test_args)
    if test_lib_args:
        test_args.module_map[test_lib_args.import_path] = test_lib_args.output
    if xtest_lib_args:
        test_args.module_map[xtest_lib_args.import_path] = xtest_lib_args.output

    if args.vet:
        dump_vet_report_for_tests(test_args, test_lib_args, xtest_lib_args)
    test_args.vet = False

    do_link_exe(test_args)


if __name__ == '__main__':
    args = pcf.get_args(sys.argv[1:])

    parser = argparse.ArgumentParser(prefix_chars='+')
    parser.add_argument('++mode', choices=['dll', 'exe', 'lib', 'test'], required=True)
    parser.add_argument('++srcs', nargs='*', required=True)
    parser.add_argument('++cgo-srcs', nargs='*')
    parser.add_argument('++test_srcs', nargs='*')
    parser.add_argument('++xtest_srcs', nargs='*')
    parser.add_argument('++cover_info', nargs='*')
    parser.add_argument('++output', nargs='?', default=None)
    parser.add_argument('++source-root', default=None)
    parser.add_argument('++build-root', required=True)
    parser.add_argument('++tools-root', default=None)
    parser.add_argument('++output-root', required=True)
    parser.add_argument('++toolchain-root', required=True)
    parser.add_argument('++host-os', choices=['linux', 'darwin', 'windows'], required=True)
    parser.add_argument('++host-arch', choices=['amd64', 'arm64'], required=True) 
    parser.add_argument('++targ-os', choices=['linux', 'darwin', 'windows'], required=True)
    parser.add_argument('++targ-arch', choices=['amd64', 'x86', 'arm64'], required=True) 
    parser.add_argument('++peers', nargs='*')
    parser.add_argument('++non-local-peers', nargs='*')
    parser.add_argument('++cgo-peers', nargs='*')
    parser.add_argument('++asmhdr', nargs='?', default=None)
    parser.add_argument('++test-import-path', nargs='?')
    parser.add_argument('++test-miner', nargs='?')
    parser.add_argument('++arc-project-prefix', nargs='?', default=arc_project_prefix)
    parser.add_argument('++std-lib-prefix', nargs='?', default=std_lib_prefix)
    parser.add_argument('++vendor-prefix', nargs='?', default=vendor_prefix)
    parser.add_argument('++extld', nargs='?', default=None)
    parser.add_argument('++extldflags', nargs='+', default=None)
    parser.add_argument('++goversion', required=True)
    parser.add_argument('++asm-flags', nargs='*')
    parser.add_argument('++compile-flags', nargs='*')
    parser.add_argument('++link-flags', nargs='*')
    parser.add_argument('++vcs', nargs='?', default=None)
    parser.add_argument('++vet', nargs='?', const=True, default=False)
    parser.add_argument('++vet-flags', nargs='*', default=None)
    parser.add_argument('++vet-info-ext', default=vet_info_ext)
    parser.add_argument('++vet-report-ext', default=vet_report_ext)
    parser.add_argument('++musl', action='store_true')
    parser.add_argument('++skip-tests', nargs='*', default=None)
    parser.add_argument('++ydx-file', default='')
    parser.add_argument('++debug-root-map', default=None)
    parser.add_argument('++embed', action='append', nargs='*')
    parser.add_argument('++embed_xtest', action='append', nargs='*')
    args = parser.parse_args(args)

    arc_project_prefix = args.arc_project_prefix
    std_lib_prefix = args.std_lib_prefix
    vendor_prefix = args.vendor_prefix
    vet_info_ext = args.vet_info_ext
    vet_report_ext = args.vet_report_ext

    preprocess_args(args)

    try:
        os.unlink(args.output)
    except OSError:
        pass

    # We are going to support only 'lib', 'exe' and 'cgo' build modes currently
    # and as a result we are going to generate only one build node per module
    # (or program)
    dispatch = {
        'exe': do_link_exe,
        'dll': do_link_exe,
        'lib': do_link_lib,
        'test': do_link_test
    }

    exit_code = 1
    try:
        dispatch[args.mode](args)
        exit_code = 0
    except KeyError:
        sys.stderr.write('Unknown build mode [{}]...\n'.format(args.mode))
    except subprocess.CalledProcessError as e:
        sys.stderr.write('{} returned non-zero exit code {}.\n{}\n'.format(' '.join(e.cmd), e.returncode, e.output))
        exit_code = e.returncode
    except Exception as e:
        sys.stderr.write('Unhandled exception [{}]...\n'.format(str(e)))
    sys.exit(exit_code)