Source file
src/go/build/deps_test.go
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7
8 package build
9
10 import (
11 "bytes"
12 "fmt"
13 "go/token"
14 "internal/dag"
15 "internal/testenv"
16 "io/fs"
17 "os"
18 "path/filepath"
19 "slices"
20 "strings"
21 "testing"
22 )
23
24
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31
32
33
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35
36
37
38 var depsRules = `
39 # No dependencies allowed for any of these packages.
40 NONE
41 < unsafe
42 < cmp,
43 container/list,
44 container/ring,
45 internal/byteorder,
46 internal/cfg,
47 internal/coverage,
48 internal/coverage/rtcov,
49 internal/coverage/uleb128,
50 internal/coverage/calloc,
51 internal/cpu,
52 internal/goarch,
53 internal/godebugs,
54 internal/goexperiment,
55 internal/goos,
56 internal/goversion,
57 internal/nettrace,
58 internal/platform,
59 internal/profilerecord,
60 internal/runtime/pprof/label,
61 internal/simd/variants,
62 internal/syslist,
63 internal/trace/tracev2,
64 internal/trace/traceviewer/format,
65 log/internal,
66 math/bits,
67 structs,
68 unicode,
69 unicode/utf8,
70 unicode/utf16;
71
72 internal/goarch < internal/abi;
73 internal/byteorder, internal/cpu, internal/goarch < internal/chacha8rand;
74 internal/goarch, math/bits < internal/strconv;
75
76 internal/cpu, internal/strconv < simd/archsimd;
77
78 # RUNTIME is the core runtime group of packages, all of them very light-weight.
79 internal/abi,
80 internal/chacha8rand,
81 internal/coverage/rtcov,
82 internal/cpu,
83 internal/goarch,
84 internal/godebugs,
85 internal/goexperiment,
86 internal/goos,
87 internal/profilerecord,
88 internal/runtime/pprof/label,
89 internal/strconv,
90 internal/trace/tracev2,
91 math/bits,
92 structs,
93 simd/archsimd
94 < internal/bytealg
95 < internal/stringslite
96 < internal/unsafeheader
97 < internal/race
98 < internal/msan
99 < internal/asan
100 < internal/runtime/sys
101 < internal/runtime/syscall/linux
102 < internal/runtime/syscall/windows
103 < internal/runtime/atomic
104 < internal/runtime/exithook
105 < internal/runtime/gc
106 < internal/runtime/math
107 < internal/runtime/maps
108 < internal/runtime/cgroup
109 < internal/runtime/gc/scan
110 < runtime
111 < runtime/secret
112 < sync/atomic
113 < internal/sync
114 < weak
115 < internal/synctest
116 < sync
117 < internal/bisect
118 < internal/godebug
119 < internal/reflectlite
120 < errors
121 < internal/oserror;
122
123 cmp, runtime, math/bits
124 < iter
125 < maps, slices;
126
127 internal/oserror, maps, slices
128 < RUNTIME;
129
130 RUNTIME
131 < sort
132 < container/heap
133 < unique;
134
135 RUNTIME
136 < io;
137
138 RUNTIME
139 < arena;
140
141 syscall !< io;
142 reflect !< sort;
143
144 RUNTIME, unicode/utf8
145 < path;
146
147 unicode !< path;
148
149 # SYSCALL is RUNTIME plus the packages necessary for basic system calls.
150 RUNTIME, unicode/utf8, unicode/utf16, internal/synctest
151 < internal/syscall/windows/sysdll, syscall/js
152 < syscall
153 < internal/syscall/unix, internal/syscall/windows, internal/syscall/windows/registry
154 < internal/syscall/execenv
155 < SYSCALL;
156
157 # TIME is SYSCALL plus the core packages about time, including context.
158 SYSCALL
159 < time/tzdata
160 < time
161 < context
162 < TIME;
163
164 TIME, io, path, slices
165 < io/fs;
166
167 # MATH is RUNTIME plus the basic math packages.
168 RUNTIME
169 < math
170 < MATH;
171
172 unicode !< math;
173
174 MATH
175 < math/cmplx;
176
177 MATH
178 < math/rand, math/rand/v2;
179
180 MATH
181 < runtime/metrics;
182
183 MATH
184 < simd/internal/spec
185 < simd/internal/simdref;
186
187 MATH, unicode/utf8
188 < strconv;
189
190 unicode !< strconv;
191
192 # STR is basic string and buffer manipulation.
193 RUNTIME, io, unicode/utf8, unicode/utf16, unicode
194 < bytes, strings
195 < bufio;
196
197 bufio, path, strconv
198 < STR;
199
200 # OS is basic OS access, including helpers (path/filepath, os/exec, etc).
201 # OS includes string routines, but those must be layered above package os.
202 # OS does not include reflection.
203 io/fs
204 < internal/testlog
205 < internal/poll
206 < internal/filepathlite
207 < os
208 < os/signal;
209
210 io/fs
211 < embed;
212
213 unicode, fmt !< net, os, os/signal;
214
215 os/signal, internal/filepathlite, STR
216 < path/filepath
217 < io/ioutil;
218
219 path/filepath, internal/godebug < os/exec;
220
221 io/ioutil, os/exec, os/signal
222 < OS;
223
224 reflect !< OS;
225
226 OS
227 < golang.org/x/sys/cpu;
228
229 # FMT is OS (which includes string routines) plus reflect and fmt.
230 # It does not include package log, which should be avoided in core packages.
231 arena, strconv, unicode
232 < reflect;
233
234 os, reflect
235 < internal/fmtsort
236 < fmt;
237
238 OS, fmt
239 < FMT;
240
241 log !< FMT;
242
243 # Misc packages needing only FMT.
244 FMT
245 < html,
246 internal/dag,
247 internal/goroot,
248 internal/types/errors,
249 mime/quotedprintable,
250 net/internal/socktest,
251 runtime/trace,
252 text/scanner,
253 text/tabwriter;
254
255 io, reflect
256 < internal/saferio;
257
258 # encodings
259 # core ones do not use fmt.
260 io, strconv, slices
261 < encoding, encoding/base32, encoding/base64;
262
263 encoding, reflect
264 < encoding/binary;
265
266 FMT, encoding < flag;
267
268 FMT, simd/archsimd < simd/internal/bridge;
269
270 simd/internal/bridge, internal/simd/variants < simd;
271
272 fmt !< encoding/base32, encoding/base64;
273
274 FMT, encoding, encoding/base32, encoding/base64, encoding/binary,
275 internal/saferio
276 < encoding/ascii85, encoding/csv, encoding/gob, encoding/hex,
277 encoding/pem, encoding/xml, mime;
278
279 STR, errors
280 < encoding/json/internal
281 < encoding/json/internal/jsonflags
282 < encoding/json/internal/jsonopts
283 < encoding/json/internal/jsonwire
284 < encoding/json/jsontext;
285
286 FMT,
287 encoding/hex,
288 encoding/base32,
289 encoding/base64,
290 encoding/binary,
291 encoding/json/jsontext,
292 encoding/json/internal,
293 encoding/json/internal/jsonflags,
294 encoding/json/internal/jsonopts,
295 encoding/json/internal/jsonwire
296 < encoding/json/v2
297 < encoding/json;
298
299 # hashes
300 io
301 < hash
302 < hash/adler32, hash/crc32, hash/crc64, hash/fnv, hash/maphash;
303
304 # math/big
305 FMT, math/rand
306 < math/big;
307
308 # compression
309 FMT, encoding/binary, hash/adler32, hash/crc32, sort
310 < compress/bzip2, compress/flate, compress/lzw, internal/zstd
311 < archive/zip, compress/gzip, compress/zlib;
312
313 # templates
314 FMT
315 < text/template/parse;
316
317 internal/bytealg, math/bits, slices, strconv, unique
318 < net/netip;
319
320 FMT, net/netip
321 < net/url;
322
323 net/url, text/template/parse
324 < text/template
325 < internal/lazytemplate;
326
327 # regexp
328 FMT, sort
329 < regexp/syntax
330 < regexp
331 < internal/lazyregexp;
332
333 encoding/json, html, text/template, regexp
334 < html/template;
335
336 # suffix array
337 encoding/binary, regexp
338 < index/suffixarray;
339
340 # executable parsing
341 FMT, encoding/binary, compress/zlib, internal/saferio, internal/zstd, sort
342 < runtime/debug
343 < debug/dwarf
344 < debug/elf, debug/gosym, debug/macho, debug/pe, debug/plan9obj, internal/xcoff
345 < debug/buildinfo
346 < DEBUG;
347
348 # go parser and friends.
349 FMT, sort
350 < internal/gover
351 < go/version
352 < go/token
353 < go/scanner
354 < go/ast
355 < go/internal/typeparams;
356
357 FMT
358 < go/build/constraint;
359
360 FMT, sort
361 < go/doc/comment;
362
363 go/internal/typeparams, go/build/constraint
364 < go/parser;
365
366 go/doc/comment, go/parser, text/tabwriter
367 < go/printer
368 < go/format;
369
370 math/big, go/token
371 < go/constant;
372
373 FMT, internal/goexperiment
374 < internal/buildcfg;
375
376 # The vast majority of standard library packages should not be resorting to regexp.
377 # go/types is a good chokepoint. It shouldn't use regexp, nor should anything
378 # that is low-enough level to be used by go/types.
379 regexp !< go/types;
380
381 go/doc/comment, go/parser, internal/lazyregexp, text/template
382 < go/doc;
383
384 go/build/constraint, go/doc, go/parser, internal/buildcfg, internal/goroot, internal/goversion, internal/platform, internal/syslist
385 < go/build;
386
387 # images
388 FMT, compress/lzw, compress/zlib
389 < image/color
390 < image, image/color/palette
391 < image/internal/imageutil
392 < image/draw
393 < image/gif, image/jpeg, image/png;
394
395 # cgo, delayed as long as possible.
396 # If you add a dependency on CGO, you must add the package
397 # to cgoPackages in cmd/dist/test.go as well.
398 RUNTIME
399 < C
400 < runtime/cgo
401 < CGO
402 < runtime/msan, runtime/asan;
403
404 # runtime/race
405 NONE < runtime/race/internal/amd64v1;
406 NONE < runtime/race/internal/amd64v3;
407 CGO, runtime/race/internal/amd64v1, runtime/race/internal/amd64v3 < runtime/race;
408
409 # Bulk of the standard library must not use cgo.
410 # The prohibition stops at net and os/user.
411 C !< fmt, go/types, CRYPTO-MATH, log/slog;
412
413 CGO, OS
414 < plugin;
415
416 CGO, FMT
417 < os/user
418 < archive/tar;
419
420 sync
421 < internal/singleflight;
422
423 os
424 < golang.org/x/net/dns/dnsmessage,
425 golang.org/x/net/lif;
426
427 os, net/netip
428 < internal/routebsd;
429
430 # net is unavoidable when doing any networking,
431 # so large dependencies must be kept out.
432 # This is a long-looking list but most of these
433 # are small with few dependencies.
434 CGO,
435 golang.org/x/net/dns/dnsmessage,
436 golang.org/x/net/lif,
437 internal/godebug,
438 internal/goversion,
439 internal/nettrace,
440 internal/poll,
441 internal/routebsd,
442 internal/singleflight,
443 net/netip,
444 os,
445 sort
446 < net;
447
448 fmt, unicode !< net;
449 math/rand !< net; # net uses runtime instead
450
451 # NET is net plus net-helper packages.
452 FMT, net
453 < net/textproto;
454
455 mime, net/textproto, net/url
456 < NET;
457
458 # logging - most packages should not import; http and up is allowed
459 FMT, log/internal
460 < log;
461
462 log, log/slog !< crypto/tls, database/sql, go/importer, testing;
463
464 FMT, log, net
465 < log/syslog;
466
467 RUNTIME
468 < log/slog/internal, log/slog/internal/buffer;
469
470 FMT,
471 encoding, encoding/json,
472 log, log/internal,
473 log/slog/internal, log/slog/internal/buffer,
474 slices
475 < log/slog
476 < log/slog/internal/slogtest, log/slog/internal/benchmarks;
477
478 NET, log
479 < net/mail;
480
481 # FIPS is the FIPS 140 module.
482 # It must not depend on external crypto packages.
483 # Package hash is ok as it's only the interface.
484 # See also fips140deps.AllowedInternalPackages.
485
486 io, math/rand/v2 < crypto/internal/randutil;
487
488 NONE < crypto/internal/constanttime;
489
490 STR < crypto/internal/impl;
491
492 OS < crypto/internal/sysrand
493 < crypto/internal/entropy;
494
495 internal/byteorder < crypto/internal/fips140deps/byteorder;
496 internal/cpu, internal/goarch < crypto/internal/fips140deps/cpu;
497 internal/godebug < crypto/internal/fips140deps/godebug;
498 time, internal/syscall/windows < crypto/internal/fips140deps/time;
499
500 crypto/internal/fips140deps/time, errors, math/bits, sync/atomic, unsafe
501 < crypto/internal/entropy/v1.0.0;
502
503 STR, hash,
504 crypto/internal/impl,
505 crypto/internal/entropy,
506 crypto/internal/randutil,
507 crypto/internal/constanttime,
508 crypto/internal/entropy/v1.0.0,
509 crypto/internal/fips140deps/byteorder,
510 crypto/internal/fips140deps/cpu,
511 crypto/internal/fips140deps/godebug
512 < crypto/internal/fips140
513 < crypto/internal/fips140/alias
514 < crypto/internal/fips140/subtle
515 < crypto/internal/fips140/sha256
516 < crypto/internal/fips140/sha512
517 < crypto/internal/fips140/sha3
518 < crypto/internal/fips140/hmac
519 < crypto/internal/fips140/check
520 < crypto/internal/fips140/pbkdf2
521 < crypto/internal/fips140/aes
522 < crypto/internal/fips140/drbg
523 < crypto/internal/fips140/aes/gcm
524 < crypto/internal/fips140/hkdf
525 < crypto/internal/fips140/mlkem
526 < crypto/internal/fips140/mldsa
527 < crypto/internal/fips140/ssh
528 < crypto/internal/fips140/tls12
529 < crypto/internal/fips140/tls13
530 < crypto/internal/fips140/bigmod
531 < crypto/internal/fips140/nistec/fiat
532 < crypto/internal/fips140/nistec
533 < crypto/internal/fips140/ecdh
534 < crypto/internal/fips140/ecdsa
535 < crypto/internal/fips140/edwards25519/field
536 < crypto/internal/fips140/edwards25519
537 < crypto/internal/fips140/ed25519
538 < crypto/internal/fips140/rsa
539 < crypto/fips140 < FIPS;
540
541 crypto !< FIPS;
542
543 # CRYPTO is core crypto algorithms - no cgo, fmt, net.
544 # Mostly wrappers around the FIPS module.
545
546 NONE < crypto/internal/boring/sig, crypto/internal/boring/syso;
547 sync/atomic < crypto/internal/boring/bcache;
548
549 FIPS, internal/godebug, embed,
550 crypto/internal/boring/sig,
551 crypto/internal/boring/syso,
552 crypto/internal/boring/bcache
553 < crypto/internal/fips140only
554 < crypto
555 < crypto/subtle
556 < crypto/sha3
557 < crypto/internal/fips140hash
558 < crypto/cipher
559 < crypto/internal/boring
560 < crypto/boring
561 < crypto/internal/rand
562 < crypto/aes,
563 crypto/des,
564 crypto/rc4,
565 crypto/md5,
566 crypto/sha1,
567 crypto/sha256,
568 crypto/sha512,
569 crypto/hmac,
570 crypto/hkdf,
571 crypto/pbkdf2,
572 crypto/ecdh,
573 crypto/mlkem,
574 crypto/mldsa
575 < CRYPTO;
576
577 CRYPTO
578 < golang.org/x/crypto/hkdf;
579
580 CGO, fmt, net !< CRYPTO;
581
582 # CRYPTO-MATH is crypto that exposes math/big APIs - no cgo, net; fmt now ok.
583
584 CRYPTO, FMT, math/big, internal/saferio
585 < crypto/internal/boring/bbig
586 < crypto/internal/fips140cache
587 < crypto/rand
588 < crypto/ed25519 # depends on crypto/rand.Reader
589 < encoding/asn1
590 < golang.org/x/crypto/cryptobyte/asn1
591 < golang.org/x/crypto/cryptobyte
592 < crypto/dsa, crypto/elliptic, crypto/rsa
593 < crypto/ecdsa
594 < CRYPTO-MATH;
595
596 CGO, net !< CRYPTO-MATH;
597
598 # uuids
599 crypto/rand, errors, encoding/binary, encoding/hex
600 < uuid;
601
602 # databases
603 FMT, uuid
604 < database/sql/internal
605 < database/sql/driver;
606
607 database/sql/driver, math/rand/v2 < database/sql;
608
609 # TLS, Prince of Dependencies.
610
611 crypto/fips140, sync/atomic < crypto/tls/internal/fips140tls;
612
613 crypto/internal/boring/sig, crypto/tls/internal/fips140tls < crypto/tls/fipsonly;
614
615 CRYPTO, golang.org/x/sys/cpu, encoding/binary, reflect
616 < golang.org/x/crypto/internal/alias
617 < golang.org/x/crypto/internal/subtle
618 < golang.org/x/crypto/chacha20
619 < golang.org/x/crypto/internal/poly1305
620 < golang.org/x/crypto/chacha20poly1305;
621
622 CRYPTO-MATH, golang.org/x/crypto/chacha20poly1305
623 < crypto/hpke;
624
625 CRYPTO-MATH, NET, container/list, encoding/hex, encoding/pem, crypto/hpke,
626 golang.org/x/crypto/chacha20poly1305, crypto/tls/internal/fips140tls
627 < crypto/x509/internal/macos
628 < crypto/x509/pkix
629 < crypto/x509
630 < crypto/tls;
631
632 # crypto-aware packages
633
634 FMT, hash/maphash
635 < container/hash;
636
637 hash/maphash, container/heap, go/constant, go/parser, internal/buildcfg, internal/goversion, internal/types/errors
638 < go/types;
639
640 DEBUG, go/build, go/types, text/scanner, crypto/sha256
641 < internal/pkgbits, internal/exportdata
642 < go/internal/gcimporter, go/internal/gccgoimporter, go/internal/srcimporter
643 < go/importer;
644
645 NET, crypto/rand, mime/quotedprintable
646 < mime/multipart;
647
648 crypto/tls
649 < net/smtp;
650
651 # HTTP, King of Dependencies.
652
653 context
654 < internal/gate;
655
656 FMT, encoding/binary
657 < golang.org/x/net/http2/hpack
658 < net/http/internal, net/http/internal/ascii, net/http/internal/testcert;
659
660 FMT, NET, container/list, encoding/binary, log
661 < golang.org/x/text/transform
662 < golang.org/x/text/unicode/norm
663 < golang.org/x/text/unicode/bidi
664 < golang.org/x/text/secure/bidirule
665 < golang.org/x/net/idna
666 < golang.org/x/net/http/httpguts, golang.org/x/net/http/httpproxy;
667
668 NET, crypto/tls
669 < net/http/httptrace;
670
671 compress/gzip,
672 golang.org/x/net/http/httpguts,
673 golang.org/x/net/http/httpproxy,
674 golang.org/x/net/http2/hpack,
675 net/http/internal,
676 net/http/internal/ascii,
677 net/http/internal/testcert,
678 net/http/httptrace,
679 mime/multipart,
680 log
681 < net/http/internal/httpcommon, net/http/internal/httpsfv
682 < net/http/internal/http2
683 < net/http;
684
685 net/http, golang.org/x/crypto/hkdf, log/slog
686 < golang.org/x/net/internal/quic/quicwire
687 < golang.org/x/net/quic, golang.org/x/net/internal/httpcommon
688 < golang.org/x/net/internal/http3
689 < golang.org/x/net/http3;
690
691 # HTTP-aware packages
692
693 encoding/json, net/http
694 < expvar;
695
696 net/http, net/http/internal/ascii
697 < net/http/cookiejar, net/http/httputil;
698
699 net/http, regexp
700 < net/http/cgi
701 < net/http/fcgi;
702
703 # Profiling
704 internal/runtime/pprof/label, runtime, context < internal/runtime/pprof;
705 FMT, compress/gzip, encoding/binary, sort, text/tabwriter, internal/runtime/pprof, internal/runtime/pprof/label
706 < runtime/pprof;
707
708 OS, compress/gzip, internal/lazyregexp
709 < internal/profile;
710
711 html, internal/profile, net/http, runtime/pprof, runtime/trace
712 < net/http/pprof;
713
714 # RPC
715 encoding/gob, encoding/json, go/token, html/template, net/http
716 < net/rpc
717 < net/rpc/jsonrpc;
718
719 # System Information
720 bufio, bytes, internal/cpu, io, os, strings, sync
721 < internal/sysinfo;
722
723 # Test-only
724 log
725 < testing/iotest
726 < testing/fstest;
727
728 FMT, flag, math/rand
729 < testing/quick;
730
731 FMT, DEBUG, flag, runtime/trace, internal/sysinfo, math/rand
732 < testing;
733
734 testing, math
735 < simd/archsimd/internal/test_helpers;
736
737 log/slog, testing
738 < testing/slogtest;
739
740 testing, crypto/rand
741 < testing/cryptotest;
742
743 NET, internal/gate
744 < internal/nettest;
745
746 net/http, flag, internal/nettest, testing
747 < net/http/httptest;
748
749 FMT, crypto/sha256, encoding/binary, encoding/json,
750 go/ast, go/parser, go/token,
751 internal/godebug, math/rand, encoding/hex
752 < internal/fuzz;
753
754 OS, flag, testing, internal/cfg, internal/platform, internal/goroot
755 < internal/testenv;
756
757 OS, encoding/base64
758 < internal/obscuretestdata;
759
760 CGO, OS, fmt
761 < internal/testpty;
762
763 NET, testing, math/rand
764 < golang.org/x/net/nettest;
765
766 syscall
767 < os/exec/internal/fdtest;
768
769 FMT, sort
770 < internal/diff;
771
772 FMT
773 < internal/txtar;
774
775 internal/synctest, testing
776 < testing/synctest;
777
778 testing
779 < internal/testhash;
780
781 CRYPTO-MATH
782 < crypto/mlkem/mlkemtest;
783
784 CRYPTO-MATH, testing, internal/testenv, internal/testhash, encoding/json, regexp
785 < crypto/internal/cryptotest;
786
787 crypto/internal/cryptotest, encoding/hex
788 < crypto/internal/cryptotest/wycheproof;
789
790 FMT, encoding/json, time, regexp
791 < crypto/internal/cryptotest/x509limbo;
792
793 CGO, FMT
794 < crypto/internal/sysrand/internal/seccomp;
795
796 FIPS
797 < crypto/internal/fips140/check/checktest;
798
799 # v2 execution trace parser.
800 FMT, io, internal/trace/tracev2
801 < internal/trace/version;
802
803 FMT, encoding/binary, internal/trace/version
804 < internal/trace/raw;
805
806 FMT, internal/trace/version, io, sort, encoding/binary
807 < internal/trace/internal/tracev1;
808
809 FMT, encoding/binary, internal/trace/version, internal/trace/internal/tracev1, container/heap, math/rand, regexp
810 < internal/trace;
811
812 # cmd/trace dependencies.
813 FMT,
814 embed,
815 encoding/json,
816 html/template,
817 internal/profile,
818 internal/trace,
819 internal/trace/traceviewer/format,
820 net/http
821 < internal/trace/traceviewer;
822
823 # Coverage.
824 FMT, hash/fnv, encoding/binary, regexp, sort, text/tabwriter,
825 internal/coverage, internal/coverage/uleb128
826 < internal/coverage/cmerge,
827 internal/coverage/pods,
828 internal/coverage/slicereader,
829 internal/coverage/slicewriter;
830
831 internal/coverage/slicereader, internal/coverage/slicewriter
832 < internal/coverage/stringtab
833 < internal/coverage/decodecounter, internal/coverage/decodemeta,
834 internal/coverage/encodecounter, internal/coverage/encodemeta;
835
836 internal/coverage/cmerge
837 < internal/coverage/cformat;
838
839 internal/coverage, crypto/sha256, FMT
840 < cmd/internal/cov/covcmd;
841
842 encoding/json,
843 runtime/debug,
844 internal/coverage/calloc,
845 internal/coverage/cformat,
846 internal/coverage/decodecounter, internal/coverage/decodemeta,
847 internal/coverage/encodecounter, internal/coverage/encodemeta,
848 internal/coverage/pods
849 < internal/coverage/cfile
850 < runtime/coverage;
851
852 internal/coverage/cfile, internal/fuzz, internal/testlog, runtime/pprof, regexp
853 < testing/internal/testdeps;
854
855 # Test-only packages can have anything they want
856
857 FMT, compress/gzip, embed, encoding/binary
858 < encoding/json/internal/jsontest;
859
860 CGO, internal/syscall/unix
861 < net/internal/cgotest;
862
863 FMT, testing
864 < internal/cgrouptest;
865
866 regexp, internal/testenv, internal/trace, internal/trace/raw, internal/txtar, testing
867 < internal/trace/testtrace;
868
869 C, CGO
870 < internal/runtime/cgobench;
871
872 # Generate-only packages can have anything they want.
873
874 container/heap,
875 encoding/binary,
876 fmt,
877 hash/maphash,
878 io,
879 log,
880 math/bits,
881 os,
882 reflect,
883 strings,
884 sync
885 < internal/runtime/gc/internal/gen;
886
887 regexp, internal/txtar, internal/trace, internal/trace/raw
888 < internal/trace/internal/testgen;
889
890 FMT
891 < math/big/internal/asmgen;
892 `
893
894
895 func listStdPkgs(goroot string) ([]string, error) {
896
897 var pkgs []string
898
899 src := filepath.Join(goroot, "src") + string(filepath.Separator)
900 walkFn := func(path string, d fs.DirEntry, err error) error {
901 if err != nil || !d.IsDir() || path == src {
902 return nil
903 }
904
905 base := filepath.Base(path)
906 if strings.HasPrefix(base, ".") || strings.HasPrefix(base, "_") || base == "testdata" {
907 return filepath.SkipDir
908 }
909
910 name := filepath.ToSlash(path[len(src):])
911 if name == "builtin" || name == "cmd" {
912 return filepath.SkipDir
913 }
914
915 pkgs = append(pkgs, strings.TrimPrefix(name, "vendor/"))
916 return nil
917 }
918 if err := filepath.WalkDir(src, walkFn); err != nil {
919 return nil, err
920 }
921 return pkgs, nil
922 }
923
924 func TestDependencies(t *testing.T) {
925 testenv.MustHaveSource(t)
926
927 ctxt := Default
928 all, err := listStdPkgs(ctxt.GOROOT)
929 if err != nil {
930 t.Fatal(err)
931 }
932 slices.Sort(all)
933
934 sawImport := map[string]map[string]bool{}
935 policy := depsPolicy(t)
936
937 for _, pkg := range all {
938 imports, err := findImports(pkg)
939 if err != nil {
940 t.Error(err)
941 continue
942 }
943 if sawImport[pkg] == nil {
944 sawImport[pkg] = map[string]bool{}
945 }
946 var bad []string
947 for _, imp := range imports {
948 sawImport[pkg][imp] = true
949 if !policy.HasEdge(pkg, imp) {
950 bad = append(bad, imp)
951 }
952 }
953 if bad != nil {
954 t.Errorf("unexpected dependency: %s imports %v", pkg, bad)
955 }
956 }
957 }
958
959 var buildIgnore = []byte("\n//go:build ignore")
960
961 func findImports(pkg string) ([]string, error) {
962 vpkg := pkg
963 if strings.HasPrefix(pkg, "golang.org") {
964 vpkg = "vendor/" + pkg
965 }
966 dir := filepath.Join(Default.GOROOT, "src", vpkg)
967 files, err := os.ReadDir(dir)
968 if err != nil {
969 return nil, err
970 }
971 var imports []string
972 var haveImport = map[string]bool{}
973 if pkg == "crypto/internal/boring" {
974 haveImport["C"] = true
975 }
976 fset := token.NewFileSet()
977 for _, file := range files {
978 name := file.Name()
979 if name == "slice_go14.go" || name == "slice_go18.go" {
980
981 continue
982 }
983 if !strings.HasSuffix(name, ".go") || strings.HasSuffix(name, "_test.go") {
984 continue
985 }
986 info := fileInfo{
987 name: filepath.Join(dir, name),
988 fset: fset,
989 }
990 f, err := os.Open(info.name)
991 if err != nil {
992 return nil, err
993 }
994 err = readGoInfo(f, &info)
995 f.Close()
996 if err != nil {
997 return nil, fmt.Errorf("reading %v: %v", name, err)
998 }
999 if info.parsed.Name.Name == "main" {
1000 continue
1001 }
1002 if bytes.Contains(info.header, buildIgnore) {
1003 continue
1004 }
1005 for _, imp := range info.imports {
1006 path := imp.path
1007 if !haveImport[path] {
1008 haveImport[path] = true
1009 imports = append(imports, path)
1010 }
1011 }
1012 }
1013 slices.Sort(imports)
1014 return imports, nil
1015 }
1016
1017
1018 func depsPolicy(t *testing.T) *dag.Graph {
1019 g, err := dag.Parse(depsRules)
1020 if err != nil {
1021 t.Fatal(err)
1022 }
1023 return g
1024 }
1025
1026
1027
1028 func TestStdlibLowercase(t *testing.T) {
1029 testenv.MustHaveSource(t)
1030
1031 ctxt := Default
1032 all, err := listStdPkgs(ctxt.GOROOT)
1033 if err != nil {
1034 t.Fatal(err)
1035 }
1036
1037 for _, pkgname := range all {
1038 if strings.ToLower(pkgname) != pkgname {
1039 t.Errorf("package %q should not use upper-case path", pkgname)
1040 }
1041 }
1042 }
1043
1044
1045 func TestFindImports(t *testing.T) {
1046 imports, err := findImports("go/build")
1047 if err != nil {
1048 t.Fatal(err)
1049 }
1050 t.Logf("go/build imports %q", imports)
1051 want := []string{"bytes", "os", "path/filepath", "strings"}
1052 wantLoop:
1053 for _, w := range want {
1054 for _, imp := range imports {
1055 if imp == w {
1056 continue wantLoop
1057 }
1058 }
1059 t.Errorf("expected to find %q in import list", w)
1060 }
1061 }
1062
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