1 // Copyright 2012 The Go Authors. All rights reserved.
2 // Use of this source code is governed by a BSD-style
3 // license that can be found in the LICENSE file.
5 // This file exercises the import parser but also checks that
6 // some low-level packages do not have new dependencies added.
24 // depsRules defines the expected dependencies between packages in
25 // the Go source tree. It is a statement of policy.
27 // DO NOT CHANGE THIS DATA TO FIX BUILDS.
28 // Existing packages should not have their constraints relaxed
29 // without prior discussion.
30 // Negative assertions should almost never be removed.
32 // The general syntax of a rule is:
36 // which means c and d come after a and b in the partial order
37 // (that is, c and d can import a and b),
38 // but doesn't provide a relative order between a vs b or c vs d.
40 // The rules can chain together, as in:
44 // which is equivalent to
49 // Except for the special bottom element "NONE", each name
50 // must appear exactly once on the right-hand side of a rule.
51 // That rule serves as the definition of the allowed dependencies
52 // for that name. The definition must appear before any uses
53 // of the name on the left-hand side of a rule. (That is, the
54 // rules themselves must be ordered according to the partial
55 // order, for easier reading by people.)
57 // Negative assertions double-check the partial order:
61 // means that it must NOT be the case that i < j.
62 // Negative assertions may appear anywhere in the rules,
63 // even before i and j have been defined.
65 // Comments begin with #.
67 // All-caps names are pseudo-names for specific points
68 // in the dependency lattice.
71 # No dependencies allowed for any of these packages.
73 < constraints, container/list, container/ring,
74 internal/cfg, internal/cpu, internal/goarch,
75 internal/goexperiment, internal/goos,
76 internal/goversion, internal/nettrace,
77 unicode/utf8, unicode/utf16, unicode,
80 # These packages depend only on internal/goarch and unsafe.
81 internal/goarch, unsafe
84 # RUNTIME is the core runtime group of packages, all of them very light-weight.
85 internal/abi, internal/cpu, internal/goarch,
86 internal/goexperiment, internal/goos, unsafe
89 < internal/unsafeheader
90 < runtime/internal/sys
91 < runtime/internal/syscall
92 < runtime/internal/atomic
93 < runtime/internal/math
98 < internal/reflectlite
100 < internal/oserror, math/bits
113 RUNTIME, unicode/utf8
118 # SYSCALL is RUNTIME plus the packages necessary for basic system calls.
119 RUNTIME, unicode/utf8, unicode/utf16
120 < internal/syscall/windows/sysdll, syscall/js
122 < internal/syscall/unix, internal/syscall/windows, internal/syscall/windows/registry
123 < internal/syscall/execenv
126 # TIME is SYSCALL plus the core packages about time, including context.
136 # MATH is RUNTIME plus the basic math packages.
157 # STR is basic string and buffer manipulation.
158 RUNTIME, io, unicode/utf8, unicode/utf16, unicode
165 # OS is basic OS access, including helpers (path/filepath, os/exec, etc).
166 # OS includes string routines, but those must be layered above package os.
167 # OS does not include reflection.
177 unicode, fmt !< net, os, os/signal;
181 < io/ioutil, os/exec;
183 io/ioutil, os/exec, os/signal
189 < golang.org/x/sys/cpu;
191 os < internal/godebug;
193 # FMT is OS (which includes string routines) plus reflect and fmt.
194 # It does not include package log, which should be avoided in core packages.
213 # Misc packages needing only FMT.
216 mime/quotedprintable,
217 net/internal/socktest,
224 # core ones do not use fmt.
230 < encoding/base32, encoding/base64;
232 FMT, encoding < flag;
234 fmt !< encoding/base32, encoding/base64;
236 FMT, encoding/base32, encoding/base64
237 < encoding/ascii85, encoding/csv, encoding/gob, encoding/hex,
238 encoding/json, encoding/pem, encoding/xml, mime;
243 < hash/adler32, hash/crc32, hash/crc64, hash/fnv, hash/maphash;
246 FMT, encoding/binary, math/rand
250 FMT, encoding/binary, hash/adler32, hash/crc32
251 < compress/bzip2, compress/flate, compress/lzw
252 < archive/zip, compress/gzip, compress/zlib;
256 < text/template/parse;
258 net/url, text/template/parse
260 < internal/lazytemplate;
262 encoding/json, html, text/template
269 < internal/lazyregexp;
272 encoding/binary, regexp
276 FMT, encoding/binary, compress/zlib
279 < debug/elf, debug/gosym, debug/macho, debug/pe, debug/plan9obj, internal/xcoff
283 # go parser and friends.
288 < go/internal/typeparams
292 < go/build/constraint;
294 go/build/constraint, go/parser, text/tabwriter
298 go/parser, internal/lazyregexp, text/template
304 container/heap, go/constant, go/parser, regexp
307 FMT, internal/goexperiment
310 go/build/constraint, go/doc, go/parser, internal/buildcfg, internal/goroot, internal/goversion
315 < database/sql/internal
316 < database/sql/driver
320 FMT, compress/lzw, compress/zlib
322 < image, image/color/palette
323 < image/internal/imageutil
325 < image/gif, image/jpeg, image/png;
327 # cgo, delayed as long as possible.
328 # If you add a dependency on CGO, you must add the package
329 # to cgoPackages in cmd/dist/test.go as well.
334 < runtime/race, runtime/msan, runtime/asan;
336 # Bulk of the standard library must not use cgo.
337 # The prohibition stops at net and os/user.
348 < internal/singleflight;
351 < golang.org/x/net/dns/dnsmessage,
352 golang.org/x/net/lif,
353 golang.org/x/net/route;
355 os, runtime, strconv, sync, unsafe,
359 internal/bytealg, internal/intern, internal/itoa, math/bits, sort, strconv
362 # net is unavoidable when doing any networking,
363 # so large dependencies must be kept out.
364 # This is a long-looking list but most of these
365 # are small with few dependencies.
367 golang.org/x/net/dns/dnsmessage,
368 golang.org/x/net/lif,
369 golang.org/x/net/route,
373 internal/singleflight,
380 math/rand !< net; # net uses runtime instead
382 # NET is net plus net-helper packages.
386 mime, net/textproto, net/url
389 # logging - most packages should not import; http and up is allowed
393 log !< crypto/tls, database/sql, go/importer, testing;
401 NONE < crypto/internal/boring/sig;
402 sync/atomic < crypto/internal/boring/fipstls;
404 encoding/binary, golang.org/x/sys/cpu, hash,
405 FMT, math/big, embed,
406 CGO, crypto/internal/boring/sig, crypto/internal/boring/fipstls
409 < crypto/internal/subtle
410 < crypto/elliptic/internal/fiat
411 < crypto/elliptic/internal/nistec
412 < crypto/ed25519/internal/edwards25519/field, golang.org/x/crypto/curve25519/internal/field
413 < crypto/ed25519/internal/edwards25519
416 < crypto/internal/boring
417 < crypto/aes, crypto/des, crypto/hmac, crypto/md5, crypto/rc4,
418 crypto/sha1, crypto/sha256, crypto/sha512
420 < crypto/internal/randutil
422 < golang.org/x/crypto/cryptobyte/asn1
423 < golang.org/x/crypto/cryptobyte
424 < golang.org/x/crypto/curve25519
425 < crypto/dsa, crypto/elliptic, crypto/rsa
429 net !< CRYPTO-BORING;
431 # TLS, Prince of Dependencies.
432 CRYPTO-BORING, NET, container/list, encoding/hex, encoding/pem
433 < golang.org/x/crypto/internal/subtle
434 < golang.org/x/crypto/chacha20
435 < golang.org/x/crypto/internal/poly1305
436 < golang.org/x/crypto/chacha20poly1305
437 < golang.org/x/crypto/hkdf
438 < crypto/x509/internal/macos
443 crypto/internal/boring/sig, crypto/internal/boring/fipstls
444 < crypto/tls/fipsonly;
446 crypto/internal/boring
449 # crypto-aware packages
451 CRYPTO-BORING, DEBUG, go/build, go/types, text/scanner
453 < go/internal/gcimporter, go/internal/gccgoimporter, go/internal/srcimporter
456 NET, crypto/rand, mime/quotedprintable
462 # HTTP, King of Dependencies.
465 < golang.org/x/net/http2/hpack
466 < net/http/internal, net/http/internal/ascii, net/http/internal/testcert;
468 FMT, NET, container/list, encoding/binary, log
469 < golang.org/x/text/transform
470 < golang.org/x/text/unicode/norm
471 < golang.org/x/text/unicode/bidi
472 < golang.org/x/text/secure/bidirule
473 < golang.org/x/net/idna
474 < golang.org/x/net/http/httpguts, golang.org/x/net/http/httpproxy;
477 < net/http/httptrace;
480 golang.org/x/net/http/httpguts,
481 golang.org/x/net/http/httpproxy,
482 golang.org/x/net/http2/hpack,
484 net/http/internal/ascii,
485 net/http/internal/testcert,
491 # HTTP-aware packages
493 encoding/json, net/http
496 net/http, net/http/internal/ascii
497 < net/http/cookiejar, net/http/httputil;
507 FMT, compress/gzip, encoding/binary, text/tabwriter
510 OS, compress/gzip, regexp
513 html, internal/profile, net/http, runtime/pprof, runtime/trace
517 encoding/gob, encoding/json, go/token, html/template, net/http
533 FMT, DEBUG, flag, runtime/trace, internal/sysinfo, math/rand
536 FMT, crypto/sha256, encoding/json, go/ast, go/parser, go/token,
537 internal/godebug, math/rand, encoding/hex, crypto/sha256
540 internal/fuzz, internal/testlog, runtime/pprof, regexp
541 < testing/internal/testdeps;
543 OS, flag, testing, internal/cfg
547 < internal/obscuretestdata;
550 < os/signal/internal/pty;
552 NET, testing, math/rand
553 < golang.org/x/net/nettest;
556 < os/exec/internal/fdtest;
558 FMT, container/heap, math/rand
562 < internal/diff, internal/txtar;
565 // listStdPkgs returns the same list of packages as "go list std".
566 func listStdPkgs(goroot string) ([]string, error) {
567 // Based on cmd/go's matchPackages function.
570 src := filepath.Join(goroot, "src") + string(filepath.Separator)
571 walkFn := func(path string, d fs.DirEntry, err error) error {
572 if err != nil || !d.IsDir() || path == src {
576 base := filepath.Base(path)
577 if strings.HasPrefix(base, ".") || strings.HasPrefix(base, "_") || base == "testdata" {
578 return filepath.SkipDir
581 name := filepath.ToSlash(path[len(src):])
582 if name == "builtin" || name == "cmd" {
583 return filepath.SkipDir
586 pkgs = append(pkgs, strings.TrimPrefix(name, "vendor/"))
589 if err := filepath.WalkDir(src, walkFn); err != nil {
595 func TestDependencies(t *testing.T) {
596 if !testenv.HasSrc() {
597 // Tests run in a limited file system and we do not
598 // provide access to every source file.
599 t.Skipf("skipping on %s/%s, missing full GOROOT", runtime.GOOS, runtime.GOARCH)
603 all, err := listStdPkgs(ctxt.GOROOT)
609 sawImport := map[string]map[string]bool{} // from package => to package => true
610 policy := depsPolicy(t)
612 for _, pkg := range all {
613 imports, err := findImports(pkg)
618 if sawImport[pkg] == nil {
619 sawImport[pkg] = map[string]bool{}
623 for _, imp := range imports {
624 sawImport[pkg][imp] = true
626 bad = append(bad, imp)
630 t.Errorf("unexpected dependency: %s imports %v", pkg, bad)
635 var buildIgnore = []byte("\n//go:build ignore")
637 func findImports(pkg string) ([]string, error) {
639 if strings.HasPrefix(pkg, "golang.org") {
640 vpkg = "vendor/" + pkg
642 dir := filepath.Join(Default.GOROOT, "src", vpkg)
643 files, err := os.ReadDir(dir)
648 var haveImport = map[string]bool{}
649 fset := token.NewFileSet()
650 for _, file := range files {
652 if name == "slice_go14.go" || name == "slice_go18.go" {
653 // These files are for compiler bootstrap with older versions of Go and not built in the standard build.
656 if !strings.HasSuffix(name, ".go") || strings.HasSuffix(name, "_test.go") {
660 name: filepath.Join(dir, name),
663 f, err := os.Open(info.name)
667 err = readGoInfo(f, &info)
670 return nil, fmt.Errorf("reading %v: %v", name, err)
672 if info.parsed.Name.Name == "main" {
675 if bytes.Contains(info.header, buildIgnore) {
678 for _, imp := range info.imports {
680 if !haveImport[path] {
681 haveImport[path] = true
682 imports = append(imports, path)
686 sort.Strings(imports)
690 // depsPolicy returns a map m such that m[p][d] == true when p can import d.
691 func depsPolicy(t *testing.T) map[string]map[string]bool {
692 allowed := map[string]map[string]bool{"NONE": {}}
693 disallowed := [][2][]string{}
695 parseDepsRules(t, func(deps []string, op string, users []string) {
697 disallowed = append(disallowed, [2][]string{deps, users})
700 for _, u := range users {
701 if allowed[u] != nil {
702 t.Errorf("multiple deps lists for %s", u)
704 allowed[u] = make(map[string]bool)
705 for _, d := range deps {
706 if allowed[d] == nil {
707 t.Errorf("use of %s before its deps list", d)
714 // Check for missing deps info.
715 for _, deps := range allowed {
716 for d := range deps {
717 if allowed[d] == nil {
718 t.Errorf("missing deps list for %s", d)
723 // Complete transitive allowed deps.
724 for k := range allowed {
725 for i := range allowed {
726 for j := range allowed {
727 if i != k && k != j && allowed[i][k] && allowed[k][j] {
729 // Can only happen along with a "use of X before deps" error above,
730 // but this error is more specific - it makes clear that reordering the
731 // rules will not be enough to fix the problem.
732 t.Errorf("deps policy cycle: %s < %s < %s", j, k, i)
740 // Check negative assertions against completed allowed deps.
741 for _, bad := range disallowed {
742 deps, users := bad[0], bad[1]
743 for _, d := range deps {
744 for _, u := range users {
746 t.Errorf("deps policy incorrect: assertion failed: %s !< %s", d, u)
759 // parseDepsRules parses depsRules, calling save(deps, op, users)
760 // for each deps < users or deps !< users rule
761 // (op is "<" or "!<").
762 func parseDepsRules(t *testing.T, save func(deps []string, op string, users []string)) {
763 p := &depsParser{t: t, lineno: 1, text: depsRules}
768 list, tok := p.nextList()
773 p.syntaxError("unexpected EOF")
784 if tok != "<" && tok != "!<" {
785 p.syntaxError("missing <")
791 // A depsParser parses the depsRules syntax described above.
792 type depsParser struct {
799 // syntaxError reports a parsing error.
800 func (p *depsParser) syntaxError(msg string) {
801 p.t.Fatalf("deps:%d: syntax error: %s near %s", p.lineno, msg, p.lastWord)
804 // nextList parses and returns a comma-separated list of names.
805 func (p *depsParser) nextList() (list []string, token string) {
814 case ",", "<", "!<", ";":
815 p.syntaxError("bad list syntax")
817 list = append(list, tok)
826 // nextToken returns the next token in the deps rules,
827 // one of ";" "," "<" "!<" or a name.
828 func (p *depsParser) nextToken() string {
840 if len(p.text) < 2 || p.text[1] != '<' {
841 p.syntaxError("unexpected token !")
847 i := strings.Index(p.text, "\n")
862 i := strings.IndexAny(p.text, "!;,<#\n \t")
874 // TestStdlibLowercase tests that all standard library package names are
875 // lowercase. See Issue 40065.
876 func TestStdlibLowercase(t *testing.T) {
877 if !testenv.HasSrc() {
878 t.Skipf("skipping on %s/%s, missing full GOROOT", runtime.GOOS, runtime.GOARCH)
882 all, err := listStdPkgs(ctxt.GOROOT)
887 for _, pkgname := range all {
888 if strings.ToLower(pkgname) != pkgname {
889 t.Errorf("package %q should not use upper-case path", pkgname)
894 // TestFindImports tests that findImports works. See #43249.
895 func TestFindImports(t *testing.T) {
896 imports, err := findImports("go/build")
900 t.Logf("go/build imports %q", imports)
901 want := []string{"bytes", "os", "path/filepath", "strings"}
903 for _, w := range want {
904 for _, imp := range imports {
909 t.Errorf("expected to find %q in import list", w)