Source file src/cmd/dist/test.go

     1  // Copyright 2015 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.
     4  
     5  package main
     6  
     7  import (
     8  	"bytes"
     9  	"encoding/json"
    10  	"flag"
    11  	"fmt"
    12  	"io"
    13  	"io/fs"
    14  	"log"
    15  	"os"
    16  	"os/exec"
    17  	"path/filepath"
    18  	"reflect"
    19  	"regexp"
    20  	"runtime"
    21  	"slices"
    22  	"strconv"
    23  	"strings"
    24  	"time"
    25  )
    26  
    27  func cmdtest() {
    28  	gogcflags = os.Getenv("GO_GCFLAGS")
    29  	setNoOpt()
    30  
    31  	var t tester
    32  
    33  	var noRebuild bool
    34  	flag.BoolVar(&t.listMode, "list", false, "list available tests")
    35  	flag.BoolVar(&t.rebuild, "rebuild", false, "rebuild everything first")
    36  	flag.BoolVar(&noRebuild, "no-rebuild", false, "overrides -rebuild (historical dreg)")
    37  	flag.BoolVar(&t.keepGoing, "k", false, "keep going even when error occurred")
    38  	flag.BoolVar(&t.race, "race", false, "run in race builder mode (different set of tests)")
    39  	flag.BoolVar(&t.compileOnly, "compile-only", false, "compile tests, but don't run them")
    40  	flag.StringVar(&t.banner, "banner", "##### ", "banner prefix; blank means no section banners")
    41  	flag.StringVar(&t.runRxStr, "run", "",
    42  		"run only those tests matching the regular expression; empty means to run all. "+
    43  			"Special exception: if the string begins with '!', the match is inverted.")
    44  	flag.BoolVar(&t.msan, "msan", false, "run in memory sanitizer builder mode")
    45  	flag.BoolVar(&t.asan, "asan", false, "run in address sanitizer builder mode")
    46  	flag.BoolVar(&t.json, "json", false, "report test results in JSON")
    47  
    48  	xflagparse(-1) // any number of args
    49  	if noRebuild {
    50  		t.rebuild = false
    51  	}
    52  
    53  	t.run()
    54  }
    55  
    56  // tester executes cmdtest.
    57  type tester struct {
    58  	race        bool
    59  	msan        bool
    60  	asan        bool
    61  	listMode    bool
    62  	rebuild     bool
    63  	failed      bool
    64  	keepGoing   bool
    65  	compileOnly bool // just try to compile all tests, but no need to run
    66  	runRxStr    string
    67  	runRx       *regexp.Regexp
    68  	runRxWant   bool     // want runRx to match (true) or not match (false)
    69  	runNames    []string // tests to run, exclusive with runRx; empty means all
    70  	banner      string   // prefix, or "" for none
    71  	lastHeading string   // last dir heading printed
    72  
    73  	short      bool
    74  	cgoEnabled bool
    75  	json       bool
    76  
    77  	tests        []distTest // use addTest to extend
    78  	testNames    map[string]bool
    79  	timeoutScale int
    80  
    81  	worklist []*work
    82  }
    83  
    84  // work tracks command execution for a test.
    85  type work struct {
    86  	dt    *distTest     // unique test name, etc.
    87  	cmd   *exec.Cmd     // must write stdout/stderr to out
    88  	flush func()        // if non-nil, called after cmd.Run
    89  	start chan bool     // a true means to start, a false means to skip
    90  	out   bytes.Buffer  // combined stdout/stderr from cmd
    91  	err   error         // work result
    92  	end   chan struct{} // a value means cmd ended (or was skipped)
    93  }
    94  
    95  // printSkip prints a skip message for all of work.
    96  func (w *work) printSkip(t *tester, msg string) {
    97  	if t.json {
    98  		synthesizeSkipEvent(json.NewEncoder(&w.out), w.dt.name, msg)
    99  		return
   100  	}
   101  	fmt.Fprintln(&w.out, msg)
   102  }
   103  
   104  // A distTest is a test run by dist test.
   105  // Each test has a unique name and belongs to a group (heading)
   106  type distTest struct {
   107  	name    string // unique test name; may be filtered with -run flag
   108  	heading string // group section; this header is printed before the test is run.
   109  	fn      func(*distTest) error
   110  }
   111  
   112  func (t *tester) run() {
   113  	timelog("start", "dist test")
   114  
   115  	os.Setenv("PATH", fmt.Sprintf("%s%c%s", gorootBin, os.PathListSeparator, os.Getenv("PATH")))
   116  
   117  	t.short = true
   118  	if v := os.Getenv("GO_TEST_SHORT"); v != "" {
   119  		short, err := strconv.ParseBool(v)
   120  		if err != nil {
   121  			fatalf("invalid GO_TEST_SHORT %q: %v", v, err)
   122  		}
   123  		t.short = short
   124  	}
   125  
   126  	cmd := exec.Command(gorootBinGo, "env", "CGO_ENABLED")
   127  	cmd.Stderr = new(bytes.Buffer)
   128  	slurp, err := cmd.Output()
   129  	if err != nil {
   130  		fatalf("Error running %s: %v\n%s", cmd, err, cmd.Stderr)
   131  	}
   132  	parts := strings.Split(string(slurp), "\n")
   133  	if nlines := len(parts) - 1; nlines < 1 {
   134  		fatalf("Error running %s: output contains <1 lines\n%s", cmd, cmd.Stderr)
   135  	}
   136  	t.cgoEnabled, _ = strconv.ParseBool(parts[0])
   137  
   138  	if flag.NArg() > 0 && t.runRxStr != "" {
   139  		fatalf("the -run regular expression flag is mutually exclusive with test name arguments")
   140  	}
   141  
   142  	t.runNames = flag.Args()
   143  
   144  	// Set GOTRACEBACK to system if the user didn't set a level explicitly.
   145  	// Since we're running tests for Go, we want as much detail as possible
   146  	// if something goes wrong.
   147  	//
   148  	// Set it before running any commands just in case something goes wrong.
   149  	if ok := isEnvSet("GOTRACEBACK"); !ok {
   150  		if err := os.Setenv("GOTRACEBACK", "system"); err != nil {
   151  			if t.keepGoing {
   152  				log.Printf("Failed to set GOTRACEBACK: %v", err)
   153  			} else {
   154  				fatalf("Failed to set GOTRACEBACK: %v", err)
   155  			}
   156  		}
   157  	}
   158  
   159  	if t.rebuild {
   160  		t.out("Building packages and commands.")
   161  		// Force rebuild the whole toolchain.
   162  		goInstall(toolenv(), gorootBinGo, append([]string{"-a"}, toolchain...)...)
   163  	}
   164  
   165  	if !t.listMode {
   166  		if builder := os.Getenv("GO_BUILDER_NAME"); builder == "" {
   167  			// Ensure that installed commands are up to date, even with -no-rebuild,
   168  			// so that tests that run commands end up testing what's actually on disk.
   169  			// If everything is up-to-date, this is a no-op.
   170  			// We first build the toolchain twice to allow it to converge,
   171  			// as when we first bootstrap.
   172  			// See cmdbootstrap for a description of the overall process.
   173  			//
   174  			// On the builders, we skip this step: we assume that 'dist test' is
   175  			// already using the result of a clean build, and because of test sharding
   176  			// and virtualization we usually start with a clean GOCACHE, so we would
   177  			// end up rebuilding large parts of the standard library that aren't
   178  			// otherwise relevant to the actual set of packages under test.
   179  			goInstall(toolenv(), gorootBinGo, toolchain...)
   180  			goInstall(toolenv(), gorootBinGo, toolchain...)
   181  			goInstall(toolenv(), gorootBinGo, toolsToInstall...)
   182  		}
   183  	}
   184  
   185  	t.timeoutScale = 1
   186  	if s := os.Getenv("GO_TEST_TIMEOUT_SCALE"); s != "" {
   187  		t.timeoutScale, err = strconv.Atoi(s)
   188  		if err != nil {
   189  			fatalf("failed to parse $GO_TEST_TIMEOUT_SCALE = %q as integer: %v", s, err)
   190  		}
   191  	}
   192  
   193  	if t.runRxStr != "" {
   194  		if t.runRxStr[0] == '!' {
   195  			t.runRxWant = false
   196  			t.runRxStr = t.runRxStr[1:]
   197  		} else {
   198  			t.runRxWant = true
   199  		}
   200  		t.runRx = regexp.MustCompile(t.runRxStr)
   201  	}
   202  
   203  	t.registerTests()
   204  	if t.listMode {
   205  		for _, tt := range t.tests {
   206  			fmt.Println(tt.name)
   207  		}
   208  		return
   209  	}
   210  
   211  	for _, name := range t.runNames {
   212  		if !t.testNames[name] {
   213  			fatalf("unknown test %q", name)
   214  		}
   215  	}
   216  
   217  	// On a few builders, make GOROOT unwritable to catch tests writing to it.
   218  	if strings.HasPrefix(os.Getenv("GO_BUILDER_NAME"), "linux-") {
   219  		if os.Getuid() == 0 {
   220  			// Don't bother making GOROOT unwritable:
   221  			// we're running as root, so permissions would have no effect.
   222  		} else {
   223  			xatexit(t.makeGOROOTUnwritable())
   224  		}
   225  	}
   226  
   227  	if !t.json {
   228  		if err := t.maybeLogMetadata(); err != nil {
   229  			t.failed = true
   230  			if t.keepGoing {
   231  				log.Printf("Failed logging metadata: %v", err)
   232  			} else {
   233  				fatalf("Failed logging metadata: %v", err)
   234  			}
   235  		}
   236  	}
   237  
   238  	var anyIncluded, someExcluded bool
   239  	for _, dt := range t.tests {
   240  		if !t.shouldRunTest(dt.name) {
   241  			someExcluded = true
   242  			continue
   243  		}
   244  		anyIncluded = true
   245  		dt := dt // dt used in background after this iteration
   246  		if err := dt.fn(&dt); err != nil {
   247  			t.runPending(&dt) // in case that hasn't been done yet
   248  			t.failed = true
   249  			if t.keepGoing {
   250  				log.Printf("Failed: %v", err)
   251  			} else {
   252  				fatalf("Failed: %v", err)
   253  			}
   254  		}
   255  	}
   256  	t.runPending(nil)
   257  	timelog("end", "dist test")
   258  
   259  	if !t.json {
   260  		if t.failed {
   261  			fmt.Println("\nFAILED")
   262  		} else if !anyIncluded {
   263  			fmt.Println()
   264  			errprintf("go tool dist: warning: %q matched no tests; use the -list flag to list available tests\n", t.runRxStr)
   265  			fmt.Println("NO TESTS TO RUN")
   266  		} else if someExcluded {
   267  			fmt.Println("\nALL TESTS PASSED (some were excluded)")
   268  		} else {
   269  			fmt.Println("\nALL TESTS PASSED")
   270  		}
   271  	}
   272  	if t.failed {
   273  		xexit(1)
   274  	}
   275  }
   276  
   277  func (t *tester) shouldRunTest(name string) bool {
   278  	if t.runRx != nil {
   279  		return t.runRx.MatchString(name) == t.runRxWant
   280  	}
   281  	if len(t.runNames) == 0 {
   282  		return true
   283  	}
   284  	return slices.Contains(t.runNames, name)
   285  }
   286  
   287  func (t *tester) maybeLogMetadata() error {
   288  	if t.compileOnly {
   289  		// We need to run a subprocess to log metadata. Don't do that
   290  		// on compile-only runs.
   291  		return nil
   292  	}
   293  	t.out("Test execution environment.")
   294  	// Helper binary to print system metadata (CPU model, etc). This is a
   295  	// separate binary from dist so it need not build with the bootstrap
   296  	// toolchain.
   297  	//
   298  	// TODO(prattmic): If we split dist bootstrap and dist test then this
   299  	// could be simplified to directly use internal/sysinfo here.
   300  	return t.dirCmd(filepath.Join(goroot, "src/cmd/internal/metadata"), gorootBinGo, []string{"run", "main.go"}).Run()
   301  }
   302  
   303  // testName returns the dist test name for a given package and variant.
   304  func testName(pkg, variant string) string {
   305  	name := pkg
   306  	if variant != "" {
   307  		name += ":" + variant
   308  	}
   309  	return name
   310  }
   311  
   312  // goTest represents all options to a "go test" command. The final command will
   313  // combine configuration from goTest and tester flags.
   314  type goTest struct {
   315  	timeout  time.Duration // If non-zero, override timeout
   316  	short    bool          // If true, force -short
   317  	tags     []string      // Build tags
   318  	race     bool          // Force -race
   319  	bench    bool          // Run benchmarks (briefly), not tests.
   320  	runTests string        // Regexp of tests to run
   321  	cpu      string        // If non-empty, -cpu flag
   322  	skip     string        // If non-empty, -skip flag
   323  
   324  	gcflags   string // If non-empty, build with -gcflags=all=X
   325  	ldflags   string // If non-empty, build with -ldflags=X
   326  	buildmode string // If non-empty, -buildmode flag
   327  
   328  	env []string // Environment variables to add, as KEY=VAL. KEY= unsets a variable
   329  
   330  	runOnHost bool // When cross-compiling, run this test on the host instead of guest
   331  
   332  	// variant, if non-empty, is a name used to distinguish different
   333  	// configurations of the same test package(s). If set and omitVariant is false,
   334  	// the Package field in test2json output is rewritten to pkg:variant.
   335  	variant string
   336  	// omitVariant indicates that variant is used solely for the dist test name and
   337  	// that the set of test names run by each variant (including empty) of a package
   338  	// is non-overlapping.
   339  	//
   340  	// TODO(mknyszek): Consider removing omitVariant as it is no longer set to true
   341  	// by any test. It's too valuable to have timing information in ResultDB that
   342  	// corresponds directly with dist names for tests.
   343  	omitVariant bool
   344  
   345  	// We have both pkg and pkgs as a convenience. Both may be set, in which
   346  	// case they will be combined. At least one must be set.
   347  	pkgs []string // Multiple packages to test
   348  	pkg  string   // A single package to test
   349  
   350  	testFlags []string // Additional flags accepted by this test
   351  }
   352  
   353  // compileOnly reports whether this test is only for compiling,
   354  // indicated by runTests being set to '^$' and bench being false.
   355  func (opts *goTest) compileOnly() bool {
   356  	return opts.runTests == "^$" && !opts.bench
   357  }
   358  
   359  // bgCommand returns a go test Cmd and a post-Run flush function. The result
   360  // will write its output to stdout and stderr. If stdout==stderr, bgCommand
   361  // ensures Writes are serialized. The caller should call flush() after Cmd exits.
   362  func (opts *goTest) bgCommand(t *tester, stdout, stderr io.Writer) (cmd *exec.Cmd, flush func()) {
   363  	build, run, pkgs, testFlags, setupCmd := opts.buildArgs(t)
   364  
   365  	// Combine the flags.
   366  	args := append([]string{"test"}, build...)
   367  	if t.compileOnly || opts.compileOnly() {
   368  		args = append(args, "-c", "-o", os.DevNull)
   369  	} else {
   370  		args = append(args, run...)
   371  	}
   372  	args = append(args, pkgs...)
   373  	if !t.compileOnly && !opts.compileOnly() {
   374  		args = append(args, testFlags...)
   375  	}
   376  
   377  	cmd = exec.Command(gorootBinGo, args...)
   378  	setupCmd(cmd)
   379  	if t.json && opts.variant != "" && !opts.omitVariant {
   380  		// Rewrite Package in the JSON output to be pkg:variant. When omitVariant
   381  		// is true, pkg.TestName is already unambiguous, so we don't need to
   382  		// rewrite the Package field.
   383  		//
   384  		// We only want to process JSON on the child's stdout. Ideally if
   385  		// stdout==stderr, we would also use the same testJSONFilter for
   386  		// cmd.Stdout and cmd.Stderr in order to keep the underlying
   387  		// interleaving of writes, but then it would see even partial writes
   388  		// interleaved, which would corrupt the JSON. So, we only process
   389  		// cmd.Stdout. This has another consequence though: if stdout==stderr,
   390  		// we have to serialize Writes in case the Writer is not concurrent
   391  		// safe. If we were just passing stdout/stderr through to exec, it would
   392  		// do this for us, but since we're wrapping stdout, we have to do it
   393  		// ourselves.
   394  		if stdout == stderr {
   395  			stdout = &lockedWriter{w: stdout}
   396  			stderr = stdout
   397  		}
   398  		f := &testJSONFilter{w: stdout, variant: opts.variant}
   399  		cmd.Stdout = f
   400  		flush = f.Flush
   401  	} else {
   402  		cmd.Stdout = stdout
   403  		flush = func() {}
   404  	}
   405  	cmd.Stderr = stderr
   406  
   407  	return cmd, flush
   408  }
   409  
   410  // run runs a go test and returns an error if it does not succeed.
   411  func (opts *goTest) run(t *tester) error {
   412  	cmd, flush := opts.bgCommand(t, os.Stdout, os.Stderr)
   413  	err := cmd.Run()
   414  	flush()
   415  	return err
   416  }
   417  
   418  // buildArgs is in internal helper for goTest that constructs the elements of
   419  // the "go test" command line. build is the flags for building the test. run is
   420  // the flags for running the test. pkgs is the list of packages to build and
   421  // run. testFlags is the list of flags to pass to the test package.
   422  //
   423  // The caller must call setupCmd on the resulting exec.Cmd to set its directory
   424  // and environment.
   425  func (opts *goTest) buildArgs(t *tester) (build, run, pkgs, testFlags []string, setupCmd func(*exec.Cmd)) {
   426  	run = append(run, "-count=1") // Disallow caching
   427  	if opts.timeout != 0 {
   428  		d := opts.timeout * time.Duration(t.timeoutScale)
   429  		run = append(run, "-timeout="+d.String())
   430  	} else if t.timeoutScale != 1 {
   431  		const goTestDefaultTimeout = 10 * time.Minute // Default value of go test -timeout flag.
   432  		run = append(run, "-timeout="+(goTestDefaultTimeout*time.Duration(t.timeoutScale)).String())
   433  	}
   434  	if opts.short || t.short {
   435  		run = append(run, "-short")
   436  	}
   437  	var tags []string
   438  	if t.iOS() {
   439  		tags = append(tags, "lldb")
   440  	}
   441  	if noOpt {
   442  		tags = append(tags, "noopt")
   443  	}
   444  	tags = append(tags, opts.tags...)
   445  	if len(tags) > 0 {
   446  		build = append(build, "-tags="+strings.Join(tags, ","))
   447  	}
   448  	if t.race || opts.race {
   449  		build = append(build, "-race")
   450  	}
   451  	if t.msan {
   452  		build = append(build, "-msan")
   453  	}
   454  	if t.asan {
   455  		build = append(build, "-asan")
   456  	}
   457  	if opts.bench {
   458  		// Run no tests.
   459  		run = append(run, "-run=^$")
   460  		// Run benchmarks briefly as a smoke test.
   461  		run = append(run, "-bench=.*", "-benchtime=.1s")
   462  	} else if opts.runTests != "" {
   463  		run = append(run, "-run="+opts.runTests)
   464  	}
   465  	if opts.cpu != "" {
   466  		run = append(run, "-cpu="+opts.cpu)
   467  	}
   468  	if opts.skip != "" {
   469  		run = append(run, "-skip="+opts.skip)
   470  	}
   471  	if t.json {
   472  		run = append(run, "-json")
   473  	}
   474  
   475  	if opts.gcflags != "" {
   476  		build = append(build, "-gcflags=all="+opts.gcflags)
   477  	}
   478  	if opts.ldflags != "" {
   479  		build = append(build, "-ldflags="+opts.ldflags)
   480  	}
   481  	if opts.buildmode != "" {
   482  		build = append(build, "-buildmode="+opts.buildmode)
   483  	}
   484  
   485  	pkgs = opts.packages()
   486  
   487  	runOnHost := opts.runOnHost && (goarch != gohostarch || goos != gohostos)
   488  	needTestFlags := len(opts.testFlags) > 0 || runOnHost
   489  	if needTestFlags {
   490  		testFlags = append([]string{"-args"}, opts.testFlags...)
   491  	}
   492  	if runOnHost {
   493  		// -target is a special flag understood by tests that can run on the host
   494  		testFlags = append(testFlags, "-target="+goos+"/"+goarch)
   495  	}
   496  
   497  	setupCmd = func(cmd *exec.Cmd) {
   498  		setDir(cmd, filepath.Join(goroot, "src"))
   499  		if len(opts.env) != 0 {
   500  			for _, kv := range opts.env {
   501  				if i := strings.Index(kv, "="); i < 0 {
   502  					unsetEnv(cmd, kv[:len(kv)-1])
   503  				} else {
   504  					setEnv(cmd, kv[:i], kv[i+1:])
   505  				}
   506  			}
   507  		}
   508  		if runOnHost {
   509  			setEnv(cmd, "GOARCH", gohostarch)
   510  			setEnv(cmd, "GOOS", gohostos)
   511  		}
   512  	}
   513  
   514  	return
   515  }
   516  
   517  // packages returns the full list of packages to be run by this goTest. This
   518  // will always include at least one package.
   519  func (opts *goTest) packages() []string {
   520  	pkgs := opts.pkgs
   521  	if opts.pkg != "" {
   522  		pkgs = append(pkgs[:len(pkgs):len(pkgs)], opts.pkg)
   523  	}
   524  	if len(pkgs) == 0 {
   525  		panic("no packages")
   526  	}
   527  	return pkgs
   528  }
   529  
   530  // printSkip prints a skip message for all of goTest.
   531  func (opts *goTest) printSkip(t *tester, msg string) {
   532  	if t.json {
   533  		enc := json.NewEncoder(os.Stdout)
   534  		for _, pkg := range opts.packages() {
   535  			synthesizeSkipEvent(enc, pkg, msg)
   536  		}
   537  		return
   538  	}
   539  	fmt.Println(msg)
   540  }
   541  
   542  // ranGoTest and stdMatches are state closed over by the stdlib
   543  // testing func in registerStdTest below. The tests are run
   544  // sequentially, so there's no need for locks.
   545  //
   546  // ranGoBench and benchMatches are the same, but are only used
   547  // in -race mode.
   548  var (
   549  	ranGoTest  bool
   550  	stdMatches []string
   551  
   552  	ranGoBench   bool
   553  	benchMatches []string
   554  )
   555  
   556  func (t *tester) registerStdTest(pkg string) {
   557  	const stdTestHeading = "Testing packages." // known to addTest for a safety check
   558  	gcflags := gogcflags
   559  	name := testName(pkg, "")
   560  	if t.runRx == nil || t.runRx.MatchString(name) == t.runRxWant {
   561  		stdMatches = append(stdMatches, pkg)
   562  	}
   563  	t.addTest(name, stdTestHeading, func(dt *distTest) error {
   564  		if ranGoTest {
   565  			return nil
   566  		}
   567  		t.runPending(dt)
   568  		timelog("start", dt.name)
   569  		defer timelog("end", dt.name)
   570  		ranGoTest = true
   571  
   572  		timeoutSec := 180 * time.Second
   573  		for _, pkg := range stdMatches {
   574  			if pkg == "cmd/go" {
   575  				timeoutSec *= 3
   576  				break
   577  			}
   578  		}
   579  		return (&goTest{
   580  			timeout: timeoutSec,
   581  			gcflags: gcflags,
   582  			pkgs:    stdMatches,
   583  		}).run(t)
   584  	})
   585  }
   586  
   587  func (t *tester) registerRaceBenchTest(pkg string) {
   588  	const raceBenchHeading = "Running benchmarks briefly." // known to addTest for a safety check
   589  	name := testName(pkg, "racebench")
   590  	if t.runRx == nil || t.runRx.MatchString(name) == t.runRxWant {
   591  		benchMatches = append(benchMatches, pkg)
   592  	}
   593  	t.addTest(name, raceBenchHeading, func(dt *distTest) error {
   594  		if ranGoBench {
   595  			return nil
   596  		}
   597  		t.runPending(dt)
   598  		timelog("start", dt.name)
   599  		defer timelog("end", dt.name)
   600  		ranGoBench = true
   601  		return (&goTest{
   602  			variant: "racebench",
   603  			// Include the variant even though there's no overlap in test names.
   604  			// This makes the test targets distinct, allowing our build system to record
   605  			// elapsed time for each one, which is useful for load-balancing test shards.
   606  			omitVariant: false,
   607  			timeout:     1200 * time.Second, // longer timeout for race with benchmarks
   608  			race:        true,
   609  			bench:       true,
   610  			cpu:         "4",
   611  			pkgs:        benchMatches,
   612  		}).run(t)
   613  	})
   614  }
   615  
   616  func (t *tester) registerTests() {
   617  	// registerStdTestSpecially tracks import paths in the standard library
   618  	// whose test registration happens in a special way.
   619  	//
   620  	// These tests *must* be able to run normally as part of "go test std cmd",
   621  	// even if they are also registered separately by dist, because users often
   622  	// run go test directly. Use skips or build tags in preference to expanding
   623  	// this list.
   624  	registerStdTestSpecially := map[string]bool{
   625  		// testdir can run normally as part of "go test std cmd", but because
   626  		// it's a very large test, we register is specially as several shards to
   627  		// enable better load balancing on sharded builders. Ideally the build
   628  		// system would know how to shard any large test package.
   629  		"cmd/internal/testdir": true,
   630  	}
   631  
   632  	// Fast path to avoid the ~1 second of `go list std cmd` when
   633  	// the caller lists specific tests to run. (as the continuous
   634  	// build coordinator does).
   635  	if len(t.runNames) > 0 {
   636  		for _, name := range t.runNames {
   637  			if !strings.Contains(name, ":") {
   638  				t.registerStdTest(name)
   639  			} else if strings.HasSuffix(name, ":racebench") {
   640  				t.registerRaceBenchTest(strings.TrimSuffix(name, ":racebench"))
   641  			}
   642  		}
   643  	} else {
   644  		// Use 'go list std cmd' to get a list of all Go packages
   645  		// that running 'go test std cmd' could find problems in.
   646  		// (In race test mode, also set -tags=race.)
   647  		// This includes vendored packages and other
   648  		// packages without tests so that 'dist test' finds if any of
   649  		// them don't build, have a problem reported by high-confidence
   650  		// vet checks that come with 'go test', and anything else it
   651  		// may check in the future. See go.dev/issue/60463.
   652  		// Most packages have tests, so there is not much saved
   653  		// by skipping non-test packages.
   654  		// For the packages without any test files,
   655  		// 'go test' knows not to actually build a test binary,
   656  		// so the only cost is the vet, and we still want to run vet.
   657  		cmd := exec.Command(gorootBinGo, "list")
   658  		if t.race {
   659  			cmd.Args = append(cmd.Args, "-tags=race")
   660  		}
   661  		cmd.Args = append(cmd.Args, "std", "cmd")
   662  		cmd.Stderr = new(bytes.Buffer)
   663  		all, err := cmd.Output()
   664  		if err != nil {
   665  			fatalf("Error running go list std cmd: %v:\n%s", err, cmd.Stderr)
   666  		}
   667  		pkgs := strings.Fields(string(all))
   668  		for _, pkg := range pkgs {
   669  			if registerStdTestSpecially[pkg] {
   670  				continue
   671  			}
   672  			if t.short && (strings.HasPrefix(pkg, "vendor/") || strings.HasPrefix(pkg, "cmd/vendor/")) {
   673  				// Vendored code has no tests, and we don't care too much about vet errors
   674  				// since we can't modify the code, so skip the tests in short mode.
   675  				// We still let the longtest builders vet them.
   676  				continue
   677  			}
   678  			t.registerStdTest(pkg)
   679  		}
   680  		if t.race && !t.short {
   681  			for _, pkg := range pkgs {
   682  				if t.packageHasBenchmarks(pkg) {
   683  					t.registerRaceBenchTest(pkg)
   684  				}
   685  			}
   686  		}
   687  	}
   688  
   689  	if t.race {
   690  		return
   691  	}
   692  
   693  	// Test the os/user package in the pure-Go mode too.
   694  	if !t.compileOnly {
   695  		t.registerTest("os/user with tag osusergo",
   696  			&goTest{
   697  				variant: "osusergo",
   698  				timeout: 300 * time.Second,
   699  				tags:    []string{"osusergo"},
   700  				pkg:     "os/user",
   701  			})
   702  		t.registerTest("hash/maphash purego implementation",
   703  			&goTest{
   704  				variant: "purego",
   705  				timeout: 300 * time.Second,
   706  				tags:    []string{"purego"},
   707  				pkg:     "hash/maphash",
   708  				env:     []string{"GODEBUG=fips140=off"}, // FIPS 140-3 mode is incompatible with purego
   709  			})
   710  	}
   711  
   712  	// Check that all crypto packages compile with the purego build tag.
   713  	t.registerTest("crypto with tag purego (build and vet only)", &goTest{
   714  		variant:  "purego",
   715  		tags:     []string{"purego"},
   716  		pkg:      "crypto/...",
   717  		runTests: "^$", // only ensure they compile
   718  	})
   719  
   720  	// Check that all crypto packages compile (and test correctly, in longmode) with fips.
   721  	if t.fipsSupported() {
   722  		// Test standard crypto packages with fips140=on.
   723  		t.registerTest("GOFIPS140=latest go test crypto/...", &goTest{
   724  			variant: "gofips140",
   725  			env:     []string{"GOFIPS140=latest"},
   726  			pkg:     "crypto/...",
   727  		})
   728  
   729  		// Test that earlier FIPS snapshots build.
   730  		// In long mode, test that they work too.
   731  		for _, version := range fipsVersions() {
   732  			suffix := " # (build and vet only)"
   733  			run := "^$" // only ensure they compile
   734  			if !t.short {
   735  				suffix = ""
   736  				run = ""
   737  			}
   738  			t.registerTest("GOFIPS140="+version+" go test crypto/..."+suffix, &goTest{
   739  				variant:  "gofips140-" + version,
   740  				pkg:      "crypto/...",
   741  				runTests: run,
   742  				env:      []string{"GOFIPS140=" + version, "GOMODCACHE=" + filepath.Join(workdir, "fips-"+version)},
   743  			})
   744  		}
   745  	}
   746  
   747  	// Test GOEXPERIMENT=jsonv2.
   748  	if !strings.Contains(goexperiment, "jsonv2") {
   749  		t.registerTest("GOEXPERIMENT=jsonv2 go test encoding/json/...", &goTest{
   750  			variant: "jsonv2",
   751  			env:     []string{"GOEXPERIMENT=" + goexperiments("jsonv2")},
   752  			pkg:     "encoding/json/...",
   753  		})
   754  	}
   755  
   756  	// Test GOEXPERIMENT=runtimesecret.
   757  	if !strings.Contains(goexperiment, "runtimesecret") {
   758  		t.registerTest("GOEXPERIMENT=runtimesecret go test runtime/secret/...", &goTest{
   759  			variant: "runtimesecret",
   760  			env:     []string{"GOEXPERIMENT=" + goexperiments("runtimesecret")},
   761  			pkg:     "runtime/secret/...",
   762  		})
   763  	}
   764  
   765  	// Test GOEXPERIMENT=simd on amd64.
   766  	if goarch == "amd64" && !strings.Contains(goexperiment, "simd") {
   767  		t.registerTest("GOEXPERIMENT=simd go test simd/archsimd/...", &goTest{
   768  			variant: "simd",
   769  			env:     []string{"GOEXPERIMENT=" + goexperiments("simd")},
   770  			pkg:     "simd/archsimd/...",
   771  		})
   772  	}
   773  
   774  	// Test ios/amd64 for the iOS simulator.
   775  	if goos == "darwin" && goarch == "amd64" && t.cgoEnabled {
   776  		t.registerTest("GOOS=ios on darwin/amd64",
   777  			&goTest{
   778  				variant:  "amd64ios",
   779  				timeout:  300 * time.Second,
   780  				runTests: "SystemRoots",
   781  				env:      []string{"GOOS=ios", "CGO_ENABLED=1"},
   782  				pkg:      "crypto/x509",
   783  			})
   784  	}
   785  
   786  	// GC debug mode tests. We only run these in long-test mode
   787  	// (with GO_TEST_SHORT=0) because this is just testing a
   788  	// non-critical debug setting.
   789  	if !t.compileOnly && !t.short {
   790  		t.registerTest("GODEBUG=gcstoptheworld=2 archive/zip",
   791  			&goTest{
   792  				variant: "gcstoptheworld2",
   793  				timeout: 300 * time.Second,
   794  				short:   true,
   795  				env:     []string{"GODEBUG=gcstoptheworld=2"},
   796  				pkg:     "archive/zip",
   797  			})
   798  		t.registerTest("GODEBUG=gccheckmark=1 runtime",
   799  			&goTest{
   800  				variant: "gccheckmark",
   801  				timeout: 300 * time.Second,
   802  				short:   true,
   803  				env:     []string{"GODEBUG=gccheckmark=1"},
   804  				pkg:     "runtime",
   805  			})
   806  	}
   807  
   808  	// Spectre mitigation smoke test.
   809  	if goos == "linux" && goarch == "amd64" {
   810  		// Pick a bunch of packages known to have some assembly.
   811  		pkgs := []string{"internal/runtime/...", "reflect", "crypto/..."}
   812  		if !t.short {
   813  			pkgs = append(pkgs, "runtime")
   814  		}
   815  		t.registerTest("spectre",
   816  			&goTest{
   817  				variant: "spectre",
   818  				short:   true,
   819  				env:     []string{"GOFLAGS=-gcflags=all=-spectre=all -asmflags=all=-spectre=all"},
   820  				pkgs:    pkgs,
   821  			})
   822  	}
   823  
   824  	// morestack tests. We only run these in long-test mode
   825  	// (with GO_TEST_SHORT=0) because the runtime test is
   826  	// already quite long and mayMoreStackMove makes it about
   827  	// twice as slow.
   828  	if !t.compileOnly && !t.short {
   829  		// hooks is the set of maymorestack hooks to test with.
   830  		hooks := []string{"mayMoreStackPreempt", "mayMoreStackMove"}
   831  		// hookPkgs is the set of package patterns to apply
   832  		// the maymorestack hook to.
   833  		hookPkgs := []string{"runtime/...", "reflect", "sync"}
   834  		// unhookPkgs is the set of package patterns to
   835  		// exclude from hookPkgs.
   836  		unhookPkgs := []string{"runtime/testdata/..."}
   837  		for _, hook := range hooks {
   838  			// Construct the build flags to use the
   839  			// maymorestack hook in the compiler and
   840  			// assembler. We pass this via the GOFLAGS
   841  			// environment variable so that it applies to
   842  			// both the test itself and to binaries built
   843  			// by the test.
   844  			goFlagsList := []string{}
   845  			for _, flag := range []string{"-gcflags", "-asmflags"} {
   846  				for _, hookPkg := range hookPkgs {
   847  					goFlagsList = append(goFlagsList, flag+"="+hookPkg+"=-d=maymorestack=runtime."+hook)
   848  				}
   849  				for _, unhookPkg := range unhookPkgs {
   850  					goFlagsList = append(goFlagsList, flag+"="+unhookPkg+"=")
   851  				}
   852  			}
   853  			goFlags := strings.Join(goFlagsList, " ")
   854  
   855  			t.registerTest("maymorestack="+hook,
   856  				&goTest{
   857  					variant: hook,
   858  					timeout: 600 * time.Second,
   859  					short:   true,
   860  					env:     []string{"GOFLAGS=" + goFlags},
   861  					pkgs:    []string{"runtime", "reflect", "sync"},
   862  				})
   863  		}
   864  	}
   865  
   866  	// Test that internal linking of standard packages does not
   867  	// require libgcc. This ensures that we can install a Go
   868  	// release on a system that does not have a C compiler
   869  	// installed and still build Go programs (that don't use cgo).
   870  	for _, pkg := range cgoPackages {
   871  		if !t.internalLink() {
   872  			break
   873  		}
   874  
   875  		// ARM libgcc may be Thumb, which internal linking does not support.
   876  		if goarch == "arm" {
   877  			break
   878  		}
   879  
   880  		// What matters is that the tests build and start up.
   881  		// Skip expensive tests, especially x509 TestSystemRoots.
   882  		run := "^Test[^CS]"
   883  		if pkg == "net" {
   884  			run = "TestTCPStress"
   885  		}
   886  		t.registerTest("Testing without libgcc.",
   887  			&goTest{
   888  				variant:  "nolibgcc",
   889  				ldflags:  "-linkmode=internal -libgcc=none",
   890  				runTests: run,
   891  				pkg:      pkg,
   892  			})
   893  	}
   894  
   895  	// Stub out following test on alpine until 54354 resolved.
   896  	builderName := os.Getenv("GO_BUILDER_NAME")
   897  	disablePIE := strings.HasSuffix(builderName, "-alpine")
   898  
   899  	// Test internal linking of PIE binaries where it is supported.
   900  	if t.internalLinkPIE() && !disablePIE {
   901  		t.registerTest("internal linking, -buildmode=pie",
   902  			&goTest{
   903  				variant:   "pie_internal",
   904  				timeout:   60 * time.Second,
   905  				buildmode: "pie",
   906  				ldflags:   "-linkmode=internal",
   907  				env:       []string{"CGO_ENABLED=0"},
   908  				pkg:       "reflect",
   909  			})
   910  		t.registerTest("internal linking, -buildmode=pie",
   911  			&goTest{
   912  				variant:   "pie_internal",
   913  				timeout:   60 * time.Second,
   914  				buildmode: "pie",
   915  				ldflags:   "-linkmode=internal",
   916  				env:       []string{"CGO_ENABLED=0"},
   917  				pkg:       "crypto/internal/fips140test",
   918  				runTests:  "TestFIPSCheck",
   919  			})
   920  		// Also test a cgo package.
   921  		if t.cgoEnabled && t.internalLink() && !disablePIE {
   922  			t.registerTest("internal linking, -buildmode=pie",
   923  				&goTest{
   924  					variant:   "pie_internal",
   925  					timeout:   60 * time.Second,
   926  					buildmode: "pie",
   927  					ldflags:   "-linkmode=internal",
   928  					pkg:       "os/user",
   929  				})
   930  		}
   931  	}
   932  
   933  	if t.extLink() && !t.compileOnly {
   934  		if goos != "android" { // Android does not support non-PIE linking
   935  			t.registerTest("external linking, -buildmode=exe",
   936  				&goTest{
   937  					variant:   "exe_external",
   938  					timeout:   60 * time.Second,
   939  					buildmode: "exe",
   940  					ldflags:   "-linkmode=external",
   941  					env:       []string{"CGO_ENABLED=1"},
   942  					pkg:       "crypto/internal/fips140test",
   943  					runTests:  "TestFIPSCheck",
   944  				})
   945  		}
   946  		if t.externalLinkPIE() && !disablePIE {
   947  			t.registerTest("external linking, -buildmode=pie",
   948  				&goTest{
   949  					variant:   "pie_external",
   950  					timeout:   60 * time.Second,
   951  					buildmode: "pie",
   952  					ldflags:   "-linkmode=external",
   953  					env:       []string{"CGO_ENABLED=1"},
   954  					pkg:       "crypto/internal/fips140test",
   955  					runTests:  "TestFIPSCheck",
   956  				})
   957  		}
   958  	}
   959  
   960  	// sync tests
   961  	if t.hasParallelism() {
   962  		t.registerTest("sync -cpu=10",
   963  			&goTest{
   964  				variant: "cpu10",
   965  				timeout: 120 * time.Second,
   966  				cpu:     "10",
   967  				pkg:     "sync",
   968  			})
   969  	}
   970  
   971  	const cgoHeading = "Testing cgo"
   972  	if t.cgoEnabled {
   973  		t.registerCgoTests(cgoHeading)
   974  	}
   975  
   976  	if goos == "wasip1" {
   977  		t.registerTest("wasip1 host tests",
   978  			&goTest{
   979  				variant:   "host",
   980  				pkg:       "internal/runtime/wasitest",
   981  				timeout:   1 * time.Minute,
   982  				runOnHost: true,
   983  			})
   984  	}
   985  
   986  	// Only run the API check on fast development platforms.
   987  	// Every platform checks the API on every GOOS/GOARCH/CGO_ENABLED combination anyway,
   988  	// so we really only need to run this check once anywhere to get adequate coverage.
   989  	// To help developers avoid trybot-only failures, we try to run on typical developer machines
   990  	// which is darwin,linux,windows/amd64 and darwin/arm64.
   991  	//
   992  	// The same logic applies to the release notes that correspond to each api/next file.
   993  	//
   994  	// TODO: remove the exclusion of goexperiment simd right before dev.simd branch is merged to master.
   995  	if goos == "darwin" || ((goos == "linux" || goos == "windows") && (goarch == "amd64" && !strings.Contains(goexperiment, "simd"))) {
   996  		t.registerTest("API release note check", &goTest{variant: "check", pkg: "cmd/relnote", testFlags: []string{"-check"}})
   997  		t.registerTest("API check", &goTest{variant: "check", pkg: "cmd/api", timeout: 5 * time.Minute, testFlags: []string{"-check"}})
   998  	}
   999  
  1000  	// Runtime CPU tests.
  1001  	if !t.compileOnly && t.hasParallelism() {
  1002  		for i := 1; i <= 4; i *= 2 {
  1003  			t.registerTest(fmt.Sprintf("GOMAXPROCS=2 runtime -cpu=%d -quick", i),
  1004  				&goTest{
  1005  					variant:   "cpu" + strconv.Itoa(i),
  1006  					timeout:   300 * time.Second,
  1007  					cpu:       strconv.Itoa(i),
  1008  					gcflags:   gogcflags,
  1009  					short:     true,
  1010  					testFlags: []string{"-quick"},
  1011  					// We set GOMAXPROCS=2 in addition to -cpu=1,2,4 in order to test runtime bootstrap code,
  1012  					// creation of first goroutines and first garbage collections in the parallel setting.
  1013  					env: []string{"GOMAXPROCS=2"},
  1014  					pkg: "runtime",
  1015  				})
  1016  		}
  1017  	}
  1018  
  1019  	if t.raceDetectorSupported() && !t.msan && !t.asan {
  1020  		// N.B. -race is incompatible with -msan and -asan.
  1021  		t.registerRaceTests()
  1022  	}
  1023  
  1024  	if goos != "android" && !t.iOS() {
  1025  		// Only start multiple test dir shards on builders,
  1026  		// where they get distributed to multiple machines.
  1027  		// See issues 20141 and 31834.
  1028  		nShards := 1
  1029  		if os.Getenv("GO_BUILDER_NAME") != "" {
  1030  			nShards = 10
  1031  		}
  1032  		if n, err := strconv.Atoi(os.Getenv("GO_TEST_SHARDS")); err == nil {
  1033  			nShards = n
  1034  		}
  1035  		for shard := 0; shard < nShards; shard++ {
  1036  			id := fmt.Sprintf("%d_%d", shard, nShards)
  1037  			t.registerTest("../test",
  1038  				&goTest{
  1039  					variant: id,
  1040  					// Include the variant even though there's no overlap in test names.
  1041  					// This makes the test target more clearly distinct in our build
  1042  					// results and is important for load-balancing test shards.
  1043  					omitVariant: false,
  1044  					pkg:         "cmd/internal/testdir",
  1045  					testFlags:   []string{fmt.Sprintf("-shard=%d", shard), fmt.Sprintf("-shards=%d", nShards)},
  1046  					runOnHost:   true,
  1047  				},
  1048  			)
  1049  		}
  1050  	}
  1051  }
  1052  
  1053  // addTest adds an arbitrary test callback to the test list.
  1054  //
  1055  // name must uniquely identify the test and heading must be non-empty.
  1056  func (t *tester) addTest(name, heading string, fn func(*distTest) error) {
  1057  	if t.testNames[name] {
  1058  		panic("duplicate registered test name " + name)
  1059  	}
  1060  	if heading == "" {
  1061  		panic("empty heading")
  1062  	}
  1063  	// Two simple checks for cases that would conflict with the fast path in registerTests.
  1064  	if !strings.Contains(name, ":") && heading != "Testing packages." {
  1065  		panic("empty variant is reserved exclusively for registerStdTest")
  1066  	} else if strings.HasSuffix(name, ":racebench") && heading != "Running benchmarks briefly." {
  1067  		panic("racebench variant is reserved exclusively for registerRaceBenchTest")
  1068  	}
  1069  	if t.testNames == nil {
  1070  		t.testNames = make(map[string]bool)
  1071  	}
  1072  	t.testNames[name] = true
  1073  	t.tests = append(t.tests, distTest{
  1074  		name:    name,
  1075  		heading: heading,
  1076  		fn:      fn,
  1077  	})
  1078  }
  1079  
  1080  type registerTestOpt interface {
  1081  	isRegisterTestOpt()
  1082  }
  1083  
  1084  // rtSkipFunc is a registerTest option that runs a skip check function before
  1085  // running the test.
  1086  type rtSkipFunc struct {
  1087  	skip func(*distTest) (string, bool) // Return message, true to skip the test
  1088  }
  1089  
  1090  func (rtSkipFunc) isRegisterTestOpt() {}
  1091  
  1092  // registerTest registers a test that runs the given goTest.
  1093  //
  1094  // Each Go package in goTest will have a corresponding test
  1095  // "<pkg>:<variant>", which must uniquely identify the test.
  1096  //
  1097  // heading and test.variant must be non-empty.
  1098  func (t *tester) registerTest(heading string, test *goTest, opts ...registerTestOpt) {
  1099  	var skipFunc func(*distTest) (string, bool)
  1100  	for _, opt := range opts {
  1101  		switch opt := opt.(type) {
  1102  		case rtSkipFunc:
  1103  			skipFunc = opt.skip
  1104  		}
  1105  	}
  1106  	// Register each test package as a separate test.
  1107  	register1 := func(test *goTest) {
  1108  		if test.variant == "" {
  1109  			panic("empty variant")
  1110  		}
  1111  		name := testName(test.pkg, test.variant)
  1112  		t.addTest(name, heading, func(dt *distTest) error {
  1113  			if skipFunc != nil {
  1114  				msg, skip := skipFunc(dt)
  1115  				if skip {
  1116  					test.printSkip(t, msg)
  1117  					return nil
  1118  				}
  1119  			}
  1120  			w := &work{dt: dt}
  1121  			w.cmd, w.flush = test.bgCommand(t, &w.out, &w.out)
  1122  			t.worklist = append(t.worklist, w)
  1123  			return nil
  1124  		})
  1125  	}
  1126  	if test.pkg != "" && len(test.pkgs) == 0 {
  1127  		// Common case. Avoid copying.
  1128  		register1(test)
  1129  		return
  1130  	}
  1131  	// TODO(dmitshur,austin): It might be better to unify the execution of 'go test pkg'
  1132  	// invocations for the same variant to be done with a single 'go test pkg1 pkg2 pkg3'
  1133  	// command, just like it's already done in registerStdTest and registerRaceBenchTest.
  1134  	// Those methods accumulate matched packages in stdMatches and benchMatches slices,
  1135  	// and we can extend that mechanism to work for all other equal variant registrations.
  1136  	// Do the simple thing to start with.
  1137  	for _, pkg := range test.packages() {
  1138  		test1 := *test
  1139  		test1.pkg, test1.pkgs = pkg, nil
  1140  		register1(&test1)
  1141  	}
  1142  }
  1143  
  1144  // dirCmd constructs a Cmd intended to be run in the foreground.
  1145  // The command will be run in dir, and Stdout and Stderr will go to os.Stdout
  1146  // and os.Stderr.
  1147  func (t *tester) dirCmd(dir string, cmdline ...any) *exec.Cmd {
  1148  	bin, args := flattenCmdline(cmdline)
  1149  	cmd := exec.Command(bin, args...)
  1150  	if filepath.IsAbs(dir) {
  1151  		setDir(cmd, dir)
  1152  	} else {
  1153  		setDir(cmd, filepath.Join(goroot, dir))
  1154  	}
  1155  	cmd.Stdout = os.Stdout
  1156  	cmd.Stderr = os.Stderr
  1157  	if vflag > 1 {
  1158  		errprintf("%#q\n", cmd)
  1159  	}
  1160  	return cmd
  1161  }
  1162  
  1163  // flattenCmdline flattens a mixture of string and []string as single list
  1164  // and then interprets it as a command line: first element is binary, then args.
  1165  func flattenCmdline(cmdline []any) (bin string, args []string) {
  1166  	var list []string
  1167  	for _, x := range cmdline {
  1168  		switch x := x.(type) {
  1169  		case string:
  1170  			list = append(list, x)
  1171  		case []string:
  1172  			list = append(list, x...)
  1173  		default:
  1174  			panic("invalid dirCmd argument type: " + reflect.TypeOf(x).String())
  1175  		}
  1176  	}
  1177  
  1178  	bin = list[0]
  1179  	if !filepath.IsAbs(bin) {
  1180  		panic("command is not absolute: " + bin)
  1181  	}
  1182  	return bin, list[1:]
  1183  }
  1184  
  1185  func (t *tester) iOS() bool {
  1186  	return goos == "ios"
  1187  }
  1188  
  1189  func (t *tester) out(v string) {
  1190  	if t.json {
  1191  		return
  1192  	}
  1193  	if t.banner == "" {
  1194  		return
  1195  	}
  1196  	fmt.Println("\n" + t.banner + v)
  1197  }
  1198  
  1199  // extLink reports whether the current goos/goarch supports
  1200  // external linking.
  1201  func (t *tester) extLink() bool {
  1202  	if !cgoEnabled[goos+"/"+goarch] {
  1203  		return false
  1204  	}
  1205  	if goarch == "ppc64" && goos != "aix" {
  1206  		return false
  1207  	}
  1208  	return true
  1209  }
  1210  
  1211  func (t *tester) internalLink() bool {
  1212  	if gohostos == "dragonfly" {
  1213  		// linkmode=internal fails on dragonfly since errno is a TLS relocation.
  1214  		return false
  1215  	}
  1216  	if goos == "android" {
  1217  		return false
  1218  	}
  1219  	if goos == "ios" {
  1220  		return false
  1221  	}
  1222  	// Internally linking cgo is incomplete on some architectures.
  1223  	// https://golang.org/issue/10373
  1224  	// https://golang.org/issue/14449
  1225  	if goarch == "mips64" || goarch == "mips64le" || goarch == "mips" || goarch == "mipsle" || goarch == "riscv64" {
  1226  		return false
  1227  	}
  1228  	if goos == "aix" {
  1229  		// linkmode=internal isn't supported.
  1230  		return false
  1231  	}
  1232  	if t.msan || t.asan {
  1233  		// linkmode=internal isn't supported by msan or asan.
  1234  		return false
  1235  	}
  1236  	return true
  1237  }
  1238  
  1239  func (t *tester) internalLinkPIE() bool {
  1240  	if t.msan || t.asan {
  1241  		// linkmode=internal isn't supported by msan or asan.
  1242  		return false
  1243  	}
  1244  	switch goos + "-" + goarch {
  1245  	case "darwin-amd64", "darwin-arm64",
  1246  		"linux-amd64", "linux-arm64", "linux-loong64", "linux-ppc64le", "linux-s390x",
  1247  		"android-arm64",
  1248  		"windows-amd64", "windows-386", "windows-arm64":
  1249  		return true
  1250  	}
  1251  	return false
  1252  }
  1253  
  1254  func (t *tester) externalLinkPIE() bool {
  1255  	// General rule is if -buildmode=pie and -linkmode=external both work, then they work together.
  1256  	return t.internalLinkPIE() && t.extLink()
  1257  }
  1258  
  1259  // supportedBuildmode reports whether the given build mode is supported.
  1260  func (t *tester) supportedBuildmode(mode string) bool {
  1261  	switch mode {
  1262  	case "c-archive", "c-shared", "shared", "plugin", "pie":
  1263  	default:
  1264  		fatalf("internal error: unknown buildmode %s", mode)
  1265  		return false
  1266  	}
  1267  
  1268  	return buildModeSupported("gc", mode, goos, goarch)
  1269  }
  1270  
  1271  func (t *tester) registerCgoTests(heading string) {
  1272  	cgoTest := func(variant string, subdir, linkmode, buildmode string, opts ...registerTestOpt) *goTest {
  1273  		gt := &goTest{
  1274  			variant:   variant,
  1275  			pkg:       "cmd/cgo/internal/" + subdir,
  1276  			buildmode: buildmode,
  1277  		}
  1278  		var ldflags []string
  1279  		if linkmode != "auto" {
  1280  			// "auto" is the default, so avoid cluttering the command line for "auto"
  1281  			ldflags = append(ldflags, "-linkmode="+linkmode)
  1282  		}
  1283  
  1284  		if linkmode == "internal" {
  1285  			gt.tags = append(gt.tags, "internal")
  1286  			if buildmode == "pie" {
  1287  				gt.tags = append(gt.tags, "internal_pie")
  1288  			}
  1289  		}
  1290  		if buildmode == "static" {
  1291  			// This isn't actually a Go buildmode, just a convenient way to tell
  1292  			// cgoTest we want static linking.
  1293  			gt.buildmode = ""
  1294  			switch linkmode {
  1295  			case "external":
  1296  				ldflags = append(ldflags, `-extldflags "-static -pthread"`)
  1297  			case "auto":
  1298  				gt.env = append(gt.env, "CGO_LDFLAGS=-static -pthread")
  1299  			default:
  1300  				panic("unknown linkmode with static build: " + linkmode)
  1301  			}
  1302  			gt.tags = append(gt.tags, "static")
  1303  		}
  1304  		gt.ldflags = strings.Join(ldflags, " ")
  1305  
  1306  		t.registerTest(heading, gt, opts...)
  1307  		return gt
  1308  	}
  1309  
  1310  	// test, testtls, and testnocgo are run with linkmode="auto", buildmode=""
  1311  	// as part of go test cmd. Here we only have to register the non-default
  1312  	// build modes of these tests.
  1313  
  1314  	// Stub out various buildmode=pie tests  on alpine until 54354 resolved.
  1315  	builderName := os.Getenv("GO_BUILDER_NAME")
  1316  	disablePIE := strings.HasSuffix(builderName, "-alpine")
  1317  
  1318  	if t.internalLink() {
  1319  		cgoTest("internal", "test", "internal", "")
  1320  	}
  1321  
  1322  	os := gohostos
  1323  	p := gohostos + "/" + goarch
  1324  	switch os {
  1325  	case "darwin", "windows":
  1326  		if !t.extLink() {
  1327  			break
  1328  		}
  1329  		// test linkmode=external, but __thread not supported, so skip testtls.
  1330  		cgoTest("external", "test", "external", "")
  1331  
  1332  		gt := cgoTest("external-s", "test", "external", "")
  1333  		gt.ldflags += " -s"
  1334  
  1335  		if t.supportedBuildmode("pie") && !disablePIE {
  1336  			cgoTest("auto-pie", "test", "auto", "pie")
  1337  			if t.internalLink() && t.internalLinkPIE() {
  1338  				cgoTest("internal-pie", "test", "internal", "pie")
  1339  			}
  1340  		}
  1341  
  1342  	case "aix", "android", "dragonfly", "freebsd", "linux", "netbsd", "openbsd":
  1343  		gt := cgoTest("external-g0", "test", "external", "")
  1344  		gt.env = append(gt.env, "CGO_CFLAGS=-g0 -fdiagnostics-color")
  1345  
  1346  		cgoTest("external", "testtls", "external", "")
  1347  		switch {
  1348  		case os == "aix":
  1349  			// no static linking
  1350  		case p == "freebsd/arm":
  1351  			// -fPIC compiled tls code will use __tls_get_addr instead
  1352  			// of __aeabi_read_tp, however, on FreeBSD/ARM, __tls_get_addr
  1353  			// is implemented in rtld-elf, so -fPIC isn't compatible with
  1354  			// static linking on FreeBSD/ARM with clang. (cgo depends on
  1355  			// -fPIC fundamentally.)
  1356  		default:
  1357  			// Check for static linking support
  1358  			var staticCheck rtSkipFunc
  1359  			ccName := compilerEnvLookup("CC", defaultcc, goos, goarch)
  1360  			cc, err := exec.LookPath(ccName)
  1361  			if err != nil {
  1362  				staticCheck.skip = func(*distTest) (string, bool) {
  1363  					return fmt.Sprintf("$CC (%q) not found, skip cgo static linking test.", ccName), true
  1364  				}
  1365  			} else {
  1366  				cmd := t.dirCmd("src/cmd/cgo/internal/test", cc, "-xc", "-o", "/dev/null", "-static", "-")
  1367  				cmd.Stdin = strings.NewReader("int main() {}")
  1368  				cmd.Stdout, cmd.Stderr = nil, nil // Discard output
  1369  				if err := cmd.Run(); err != nil {
  1370  					// Skip these tests
  1371  					staticCheck.skip = func(*distTest) (string, bool) {
  1372  						return "No support for static linking found (lacks libc.a?), skip cgo static linking test.", true
  1373  					}
  1374  				}
  1375  			}
  1376  
  1377  			// Doing a static link with boringcrypto gets
  1378  			// a C linker warning on Linux.
  1379  			// in function `bio_ip_and_port_to_socket_and_addr':
  1380  			// warning: Using 'getaddrinfo' in statically linked applications requires at runtime the shared libraries from the glibc version used for linking
  1381  			if staticCheck.skip == nil && goos == "linux" && strings.Contains(goexperiment, "boringcrypto") {
  1382  				staticCheck.skip = func(*distTest) (string, bool) {
  1383  					return "skipping static linking check on Linux when using boringcrypto to avoid C linker warning about getaddrinfo", true
  1384  				}
  1385  			}
  1386  
  1387  			// Static linking tests
  1388  			if goos != "android" && p != "netbsd/arm" && !t.msan && !t.asan {
  1389  				// TODO(#56629): Why does this fail on netbsd-arm?
  1390  				// TODO(#70080): Why does this fail with msan?
  1391  				// asan doesn't support static linking (this is an explicit build error on the C side).
  1392  				cgoTest("static", "testtls", "external", "static", staticCheck)
  1393  			}
  1394  			cgoTest("external", "testnocgo", "external", "", staticCheck)
  1395  			if goos != "android" && !t.msan && !t.asan {
  1396  				// TODO(#70080): Why does this fail with msan?
  1397  				// asan doesn't support static linking (this is an explicit build error on the C side).
  1398  				cgoTest("static", "testnocgo", "external", "static", staticCheck)
  1399  				cgoTest("static", "test", "external", "static", staticCheck)
  1400  				// -static in CGO_LDFLAGS triggers a different code path
  1401  				// than -static in -extldflags, so test both.
  1402  				// See issue #16651.
  1403  				if goarch != "loong64" && !t.msan && !t.asan {
  1404  					// TODO(#56623): Why does this fail on loong64?
  1405  					cgoTest("auto-static", "test", "auto", "static", staticCheck)
  1406  				}
  1407  			}
  1408  
  1409  			// PIE linking tests
  1410  			if t.supportedBuildmode("pie") && !disablePIE {
  1411  				cgoTest("auto-pie", "test", "auto", "pie")
  1412  				if t.internalLink() && t.internalLinkPIE() {
  1413  					cgoTest("internal-pie", "test", "internal", "pie")
  1414  				}
  1415  				cgoTest("auto-pie", "testtls", "auto", "pie")
  1416  				cgoTest("auto-pie", "testnocgo", "auto", "pie")
  1417  			}
  1418  		}
  1419  	}
  1420  }
  1421  
  1422  // runPending runs pending test commands, in parallel, emitting headers as appropriate.
  1423  // When finished, it emits header for nextTest, which is going to run after the
  1424  // pending commands are done (and runPending returns).
  1425  // A test should call runPending if it wants to make sure that it is not
  1426  // running in parallel with earlier tests, or if it has some other reason
  1427  // for needing the earlier tests to be done.
  1428  func (t *tester) runPending(nextTest *distTest) {
  1429  	worklist := t.worklist
  1430  	t.worklist = nil
  1431  	for _, w := range worklist {
  1432  		w.start = make(chan bool)
  1433  		w.end = make(chan struct{})
  1434  		// w.cmd must be set up to write to w.out. We can't check that, but we
  1435  		// can check for easy mistakes.
  1436  		if w.cmd.Stdout == nil || w.cmd.Stdout == os.Stdout || w.cmd.Stderr == nil || w.cmd.Stderr == os.Stderr {
  1437  			panic("work.cmd.Stdout/Stderr must be redirected")
  1438  		}
  1439  		go func(w *work) {
  1440  			if !<-w.start {
  1441  				timelog("skip", w.dt.name)
  1442  				w.printSkip(t, "skipped due to earlier error")
  1443  			} else {
  1444  				timelog("start", w.dt.name)
  1445  				w.err = w.cmd.Run()
  1446  				if w.flush != nil {
  1447  					w.flush()
  1448  				}
  1449  				if w.err != nil {
  1450  					if isUnsupportedVMASize(w) {
  1451  						timelog("skip", w.dt.name)
  1452  						w.out.Reset()
  1453  						w.printSkip(t, "skipped due to unsupported VMA")
  1454  						w.err = nil
  1455  					}
  1456  				}
  1457  			}
  1458  			timelog("end", w.dt.name)
  1459  			w.end <- struct{}{}
  1460  		}(w)
  1461  	}
  1462  
  1463  	maxbg := maxbg
  1464  	// for runtime.NumCPU() < 4 ||  runtime.GOMAXPROCS(0) == 1, do not change maxbg.
  1465  	// Because there is not enough CPU to parallel the testing of multiple packages.
  1466  	if runtime.NumCPU() > 4 && runtime.GOMAXPROCS(0) != 1 {
  1467  		for _, w := range worklist {
  1468  			// See go.dev/issue/65164
  1469  			// because GOMAXPROCS=2 runtime CPU usage is low,
  1470  			// so increase maxbg to avoid slowing down execution with low CPU usage.
  1471  			// This makes testing a single package slower,
  1472  			// but testing multiple packages together faster.
  1473  			if strings.Contains(w.dt.heading, "GOMAXPROCS=2 runtime") {
  1474  				maxbg = runtime.NumCPU()
  1475  				break
  1476  			}
  1477  		}
  1478  	}
  1479  
  1480  	started := 0
  1481  	ended := 0
  1482  	var last *distTest
  1483  	for ended < len(worklist) {
  1484  		for started < len(worklist) && started-ended < maxbg {
  1485  			w := worklist[started]
  1486  			started++
  1487  			w.start <- !t.failed || t.keepGoing
  1488  		}
  1489  		w := worklist[ended]
  1490  		dt := w.dt
  1491  		if t.lastHeading != dt.heading {
  1492  			t.lastHeading = dt.heading
  1493  			t.out(dt.heading)
  1494  		}
  1495  		if dt != last {
  1496  			// Assumes all the entries for a single dt are in one worklist.
  1497  			last = w.dt
  1498  			if vflag > 0 {
  1499  				fmt.Printf("# go tool dist test -run=^%s$\n", dt.name)
  1500  			}
  1501  		}
  1502  		if vflag > 1 {
  1503  			errprintf("%#q\n", w.cmd)
  1504  		}
  1505  		ended++
  1506  		<-w.end
  1507  		os.Stdout.Write(w.out.Bytes())
  1508  		// We no longer need the output, so drop the buffer.
  1509  		w.out = bytes.Buffer{}
  1510  		if w.err != nil {
  1511  			log.Printf("Failed: %v", w.err)
  1512  			t.failed = true
  1513  		}
  1514  	}
  1515  	if t.failed && !t.keepGoing {
  1516  		fatalf("FAILED")
  1517  	}
  1518  
  1519  	if dt := nextTest; dt != nil {
  1520  		if t.lastHeading != dt.heading {
  1521  			t.lastHeading = dt.heading
  1522  			t.out(dt.heading)
  1523  		}
  1524  		if vflag > 0 {
  1525  			fmt.Printf("# go tool dist test -run=^%s$\n", dt.name)
  1526  		}
  1527  	}
  1528  }
  1529  
  1530  // hasParallelism is a copy of the function
  1531  // internal/testenv.HasParallelism, which can't be used here
  1532  // because cmd/dist can not import internal packages during bootstrap.
  1533  func (t *tester) hasParallelism() bool {
  1534  	switch goos {
  1535  	case "js", "wasip1":
  1536  		return false
  1537  	}
  1538  	return true
  1539  }
  1540  
  1541  func (t *tester) raceDetectorSupported() bool {
  1542  	if gohostos != goos {
  1543  		return false
  1544  	}
  1545  	if !t.cgoEnabled {
  1546  		return false
  1547  	}
  1548  	if !raceDetectorSupported(goos, goarch) {
  1549  		return false
  1550  	}
  1551  	// The race detector doesn't work on Alpine Linux:
  1552  	// golang.org/issue/14481
  1553  	if isAlpineLinux() {
  1554  		return false
  1555  	}
  1556  	// NetBSD support is unfinished.
  1557  	// golang.org/issue/26403
  1558  	if goos == "netbsd" {
  1559  		return false
  1560  	}
  1561  	return true
  1562  }
  1563  
  1564  func isAlpineLinux() bool {
  1565  	if runtime.GOOS != "linux" {
  1566  		return false
  1567  	}
  1568  	fi, err := os.Lstat("/etc/alpine-release")
  1569  	return err == nil && fi.Mode().IsRegular()
  1570  }
  1571  
  1572  func (t *tester) registerRaceTests() {
  1573  	hdr := "Testing race detector"
  1574  	t.registerTest(hdr,
  1575  		&goTest{
  1576  			variant:  "race",
  1577  			race:     true,
  1578  			runTests: "Output",
  1579  			pkg:      "runtime/race",
  1580  		})
  1581  	t.registerTest(hdr,
  1582  		&goTest{
  1583  			variant:  "race",
  1584  			race:     true,
  1585  			runTests: "TestParse|TestEcho|TestStdinCloseRace|TestClosedPipeRace|TestTypeRace|TestFdRace|TestFdReadRace|TestFileCloseRace",
  1586  			pkgs:     []string{"flag", "net", "os", "os/exec", "encoding/gob"},
  1587  		})
  1588  	// We don't want the following line, because it
  1589  	// slows down all.bash (by 10 seconds on my laptop).
  1590  	// The race builder should catch any error here, but doesn't.
  1591  	// TODO(iant): Figure out how to catch this.
  1592  	// t.registerTest(hdr, &goTest{variant: "race", race: true, runTests: "TestParallelTest", pkg: "cmd/go"})
  1593  	if t.cgoEnabled {
  1594  		// Building cmd/cgo/internal/test takes a long time.
  1595  		// There are already cgo-enabled packages being tested with the race detector.
  1596  		// We shouldn't need to redo all of cmd/cgo/internal/test too.
  1597  		// The race builder will take care of this.
  1598  		// t.registerTest(hdr, &goTest{variant: "race", race: true, env: []string{"GOTRACEBACK=2"}, pkg: "cmd/cgo/internal/test"})
  1599  	}
  1600  	if t.extLink() {
  1601  		// Test with external linking; see issue 9133.
  1602  		t.registerTest(hdr,
  1603  			&goTest{
  1604  				variant:  "race-external",
  1605  				race:     true,
  1606  				ldflags:  "-linkmode=external",
  1607  				runTests: "TestParse|TestEcho|TestStdinCloseRace",
  1608  				pkgs:     []string{"flag", "os/exec"},
  1609  			})
  1610  	}
  1611  }
  1612  
  1613  // cgoPackages is the standard packages that use cgo.
  1614  var cgoPackages = []string{
  1615  	"net",
  1616  	"os/user",
  1617  }
  1618  
  1619  var funcBenchmark = []byte("\nfunc Benchmark")
  1620  
  1621  // packageHasBenchmarks reports whether pkg has benchmarks.
  1622  // On any error, it conservatively returns true.
  1623  //
  1624  // This exists just to eliminate work on the builders, since compiling
  1625  // a test in race mode just to discover it has no benchmarks costs a
  1626  // second or two per package, and this function returns false for
  1627  // about 100 packages.
  1628  func (t *tester) packageHasBenchmarks(pkg string) bool {
  1629  	pkgDir := filepath.Join(goroot, "src", pkg)
  1630  	d, err := os.Open(pkgDir)
  1631  	if err != nil {
  1632  		return true // conservatively
  1633  	}
  1634  	defer d.Close()
  1635  	names, err := d.Readdirnames(-1)
  1636  	if err != nil {
  1637  		return true // conservatively
  1638  	}
  1639  	for _, name := range names {
  1640  		if !strings.HasSuffix(name, "_test.go") {
  1641  			continue
  1642  		}
  1643  		slurp, err := os.ReadFile(filepath.Join(pkgDir, name))
  1644  		if err != nil {
  1645  			return true // conservatively
  1646  		}
  1647  		if bytes.Contains(slurp, funcBenchmark) {
  1648  			return true
  1649  		}
  1650  	}
  1651  	return false
  1652  }
  1653  
  1654  // makeGOROOTUnwritable makes all $GOROOT files & directories non-writable to
  1655  // check that no tests accidentally write to $GOROOT.
  1656  func (t *tester) makeGOROOTUnwritable() (undo func()) {
  1657  	dir := os.Getenv("GOROOT")
  1658  	if dir == "" {
  1659  		panic("GOROOT not set")
  1660  	}
  1661  
  1662  	type pathMode struct {
  1663  		path string
  1664  		mode os.FileMode
  1665  	}
  1666  	var dirs []pathMode // in lexical order
  1667  
  1668  	undo = func() {
  1669  		for i := range dirs {
  1670  			os.Chmod(dirs[i].path, dirs[i].mode) // best effort
  1671  		}
  1672  	}
  1673  
  1674  	filepath.WalkDir(dir, func(path string, d fs.DirEntry, err error) error {
  1675  		if suffix := strings.TrimPrefix(path, dir+string(filepath.Separator)); suffix != "" {
  1676  			if suffix == ".git" {
  1677  				// Leave Git metadata in whatever state it was in. It may contain a lot
  1678  				// of files, and it is highly unlikely that a test will try to modify
  1679  				// anything within that directory.
  1680  				return filepath.SkipDir
  1681  			}
  1682  		}
  1683  		if err != nil {
  1684  			return nil
  1685  		}
  1686  
  1687  		info, err := d.Info()
  1688  		if err != nil {
  1689  			return nil
  1690  		}
  1691  
  1692  		mode := info.Mode()
  1693  		if mode&0222 != 0 && (mode.IsDir() || mode.IsRegular()) {
  1694  			dirs = append(dirs, pathMode{path, mode})
  1695  		}
  1696  		return nil
  1697  	})
  1698  
  1699  	// Run over list backward to chmod children before parents.
  1700  	for i := len(dirs) - 1; i >= 0; i-- {
  1701  		err := os.Chmod(dirs[i].path, dirs[i].mode&^0222)
  1702  		if err != nil {
  1703  			dirs = dirs[i:] // Only undo what we did so far.
  1704  			undo()
  1705  			fatalf("failed to make GOROOT read-only: %v", err)
  1706  		}
  1707  	}
  1708  
  1709  	return undo
  1710  }
  1711  
  1712  // raceDetectorSupported is a copy of the function
  1713  // internal/platform.RaceDetectorSupported, which can't be used here
  1714  // because cmd/dist can not import internal packages during bootstrap.
  1715  // The race detector only supports 48-bit VMA on arm64. But we don't have
  1716  // a good solution to check VMA size (see https://go.dev/issue/29948).
  1717  // raceDetectorSupported will always return true for arm64. But race
  1718  // detector tests may abort on non 48-bit VMA configuration, the tests
  1719  // will be marked as "skipped" in this case.
  1720  func raceDetectorSupported(goos, goarch string) bool {
  1721  	switch goos {
  1722  	case "linux":
  1723  		return goarch == "amd64" || goarch == "arm64" || goarch == "loong64" || goarch == "ppc64le" || goarch == "riscv64" || goarch == "s390x"
  1724  	case "darwin":
  1725  		return goarch == "amd64" || goarch == "arm64"
  1726  	case "freebsd", "netbsd", "windows":
  1727  		return goarch == "amd64"
  1728  	default:
  1729  		return false
  1730  	}
  1731  }
  1732  
  1733  // buildModeSupported is a copy of the function
  1734  // internal/platform.BuildModeSupported, which can't be used here
  1735  // because cmd/dist can not import internal packages during bootstrap.
  1736  func buildModeSupported(compiler, buildmode, goos, goarch string) bool {
  1737  	if compiler == "gccgo" {
  1738  		return true
  1739  	}
  1740  
  1741  	platform := goos + "/" + goarch
  1742  
  1743  	switch buildmode {
  1744  	case "archive":
  1745  		return true
  1746  
  1747  	case "c-archive":
  1748  		switch goos {
  1749  		case "aix", "darwin", "ios", "windows":
  1750  			return true
  1751  		case "linux":
  1752  			switch goarch {
  1753  			case "386", "amd64", "arm", "armbe", "arm64", "arm64be", "loong64", "ppc64le", "riscv64", "s390x":
  1754  				// linux/ppc64 not supported because it does
  1755  				// not support external linking mode yet.
  1756  				return true
  1757  			default:
  1758  				// Other targets do not support -shared,
  1759  				// per ParseFlags in
  1760  				// cmd/compile/internal/base/flag.go.
  1761  				// For c-archive the Go tool passes -shared,
  1762  				// so that the result is suitable for inclusion
  1763  				// in a PIE or shared library.
  1764  				return false
  1765  			}
  1766  		case "freebsd":
  1767  			return goarch == "amd64"
  1768  		}
  1769  		return false
  1770  
  1771  	case "c-shared":
  1772  		switch platform {
  1773  		case "linux/amd64", "linux/arm", "linux/arm64", "linux/loong64", "linux/386", "linux/ppc64le", "linux/riscv64", "linux/s390x",
  1774  			"android/amd64", "android/arm", "android/arm64", "android/386",
  1775  			"freebsd/amd64",
  1776  			"darwin/amd64", "darwin/arm64",
  1777  			"windows/amd64", "windows/386", "windows/arm64",
  1778  			"wasip1/wasm":
  1779  			return true
  1780  		}
  1781  		return false
  1782  
  1783  	case "default":
  1784  		return true
  1785  
  1786  	case "exe":
  1787  		return true
  1788  
  1789  	case "pie":
  1790  		switch platform {
  1791  		case "linux/386", "linux/amd64", "linux/arm", "linux/arm64", "linux/loong64", "linux/ppc64le", "linux/riscv64", "linux/s390x",
  1792  			"android/amd64", "android/arm", "android/arm64", "android/386",
  1793  			"freebsd/amd64",
  1794  			"darwin/amd64", "darwin/arm64",
  1795  			"ios/amd64", "ios/arm64",
  1796  			"aix/ppc64",
  1797  			"openbsd/arm64",
  1798  			"windows/386", "windows/amd64", "windows/arm64":
  1799  			return true
  1800  		}
  1801  		return false
  1802  
  1803  	case "shared":
  1804  		switch platform {
  1805  		case "linux/386", "linux/amd64", "linux/arm", "linux/arm64", "linux/ppc64le", "linux/s390x":
  1806  			return true
  1807  		}
  1808  		return false
  1809  
  1810  	case "plugin":
  1811  		switch platform {
  1812  		case "linux/amd64", "linux/arm", "linux/arm64", "linux/386", "linux/loong64", "linux/riscv64", "linux/s390x", "linux/ppc64le",
  1813  			"android/amd64", "android/386",
  1814  			"darwin/amd64", "darwin/arm64",
  1815  			"freebsd/amd64":
  1816  			return true
  1817  		}
  1818  		return false
  1819  
  1820  	default:
  1821  		return false
  1822  	}
  1823  }
  1824  
  1825  // isUnsupportedVMASize reports whether the failure is caused by an unsupported
  1826  // VMA for the race detector (for example, running the race detector on an
  1827  // arm64 machine configured with 39-bit VMA).
  1828  func isUnsupportedVMASize(w *work) bool {
  1829  	unsupportedVMA := []byte("unsupported VMA range")
  1830  	return strings.Contains(w.dt.name, ":race") && bytes.Contains(w.out.Bytes(), unsupportedVMA)
  1831  }
  1832  
  1833  // isEnvSet reports whether the environment variable evar is
  1834  // set in the environment.
  1835  func isEnvSet(evar string) bool {
  1836  	evarEq := evar + "="
  1837  	for _, e := range os.Environ() {
  1838  		if strings.HasPrefix(e, evarEq) {
  1839  			return true
  1840  		}
  1841  	}
  1842  	return false
  1843  }
  1844  
  1845  func (t *tester) fipsSupported() bool {
  1846  	// Keep this in sync with [crypto/internal/fips140.Supported].
  1847  
  1848  	// We don't test with the purego tag, so no need to check it.
  1849  
  1850  	// Use GOFIPS140 or GOEXPERIMENT=boringcrypto, but not both.
  1851  	if strings.Contains(goexperiment, "boringcrypto") {
  1852  		return false
  1853  	}
  1854  
  1855  	// If this goos/goarch does not support FIPS at all, return no versions.
  1856  	// The logic here matches crypto/internal/fips140/check.Supported for now.
  1857  	// In the future, if some snapshots add support for these, we will have
  1858  	// to make a decision on a per-version basis.
  1859  	switch {
  1860  	case goarch == "wasm",
  1861  		goos == "windows" && goarch == "386",
  1862  		goos == "openbsd",
  1863  		goos == "aix":
  1864  		return false
  1865  	}
  1866  
  1867  	// For now, FIPS+ASAN doesn't need to work.
  1868  	// If this is made to work, also re-enable the test in check_test.go.
  1869  	if t.asan {
  1870  		return false
  1871  	}
  1872  
  1873  	return true
  1874  }
  1875  
  1876  // fipsVersions returns the list of versions available in lib/fips140.
  1877  func fipsVersions() []string {
  1878  	var versions []string
  1879  	zips, err := filepath.Glob(filepath.Join(goroot, "lib/fips140/*.zip"))
  1880  	if err != nil {
  1881  		fatalf("%v", err)
  1882  	}
  1883  	for _, zip := range zips {
  1884  		versions = append(versions, strings.TrimSuffix(filepath.Base(zip), ".zip"))
  1885  	}
  1886  	txts, err := filepath.Glob(filepath.Join(goroot, "lib/fips140/*.txt"))
  1887  	if err != nil {
  1888  		fatalf("%v", err)
  1889  	}
  1890  	for _, txt := range txts {
  1891  		versions = append(versions, strings.TrimSuffix(filepath.Base(txt), ".txt"))
  1892  	}
  1893  	return versions
  1894  }
  1895  
  1896  // goexperiments returns the GOEXPERIMENT value to use
  1897  // when running a test with the given experiments enabled.
  1898  //
  1899  // It preserves any existing GOEXPERIMENTs.
  1900  func goexperiments(exps ...string) string {
  1901  	if len(exps) == 0 {
  1902  		return goexperiment
  1903  	}
  1904  	existing := goexperiment
  1905  	if existing != "" {
  1906  		existing += ","
  1907  	}
  1908  	return existing + strings.Join(exps, ",")
  1909  
  1910  }
  1911  

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