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