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  	t.asmflags = os.Getenv("GO_TEST_ASMFLAGS")
    34  
    35  	var noRebuild bool
    36  	flag.BoolVar(&t.listMode, "list", false, "list available tests")
    37  	flag.BoolVar(&t.rebuild, "rebuild", false, "rebuild everything first")
    38  	flag.BoolVar(&noRebuild, "no-rebuild", false, "overrides -rebuild (historical dreg)")
    39  	flag.BoolVar(&t.keepGoing, "k", false, "keep going even when error occurred")
    40  	flag.BoolVar(&t.race, "race", false, "run in race builder mode (different set of tests)")
    41  	flag.BoolVar(&t.compileOnly, "compile-only", false, "compile tests, but don't run them")
    42  	flag.StringVar(&t.banner, "banner", "##### ", "banner prefix; blank means no section banners")
    43  	flag.StringVar(&t.runRxStr, "run", "",
    44  		"run only those tests matching the regular expression; empty means to run all. "+
    45  			"Special exception: if the string begins with '!', the match is inverted.")
    46  	flag.BoolVar(&t.msan, "msan", false, "run in memory sanitizer builder mode")
    47  	flag.BoolVar(&t.asan, "asan", false, "run in address sanitizer builder mode")
    48  	flag.BoolVar(&t.json, "json", false, "report test results in JSON")
    49  
    50  	xflagparse(-1) // any number of args
    51  	if noRebuild {
    52  		t.rebuild = false
    53  	}
    54  
    55  	t.run()
    56  }
    57  
    58  // tester executes cmdtest.
    59  type tester struct {
    60  	race        bool
    61  	msan        bool
    62  	asan        bool
    63  	listMode    bool
    64  	rebuild     bool
    65  	failed      bool
    66  	keepGoing   bool
    67  	compileOnly bool // just try to compile all tests, but no need to run
    68  	short       bool
    69  	cgoEnabled  bool
    70  	asmflags    string
    71  	json        bool
    72  	runRxStr    string
    73  	runRx       *regexp.Regexp
    74  	runRxWant   bool     // want runRx to match (true) or not match (false)
    75  	runNames    []string // tests to run, exclusive with runRx; empty means all
    76  	banner      string   // prefix, or "" for none
    77  	lastHeading string   // last dir heading printed
    78  
    79  	tests        []distTest // use addTest to extend
    80  	testNames    map[string]bool
    81  	timeoutScale int // a non-negative integer factor to scale test timeout by; defaults to 1
    82  
    83  	worklist []*work
    84  }
    85  
    86  // work tracks command execution for a test.
    87  type work struct {
    88  	dt    *distTest     // unique test name, etc.
    89  	cmd   *exec.Cmd     // must write stdout/stderr to out
    90  	flush func()        // if non-nil, called after cmd.Run
    91  	start chan bool     // a true means to start, a false means to skip
    92  	out   bytes.Buffer  // combined stdout/stderr from cmd
    93  	err   error         // work result
    94  	end   chan struct{} // a value means cmd ended (or was skipped)
    95  }
    96  
    97  // printSkip prints a skip message for all of work.
    98  func (w *work) printSkip(t *tester, msg string) {
    99  	if t.json {
   100  		synthesizeSkipEvent(json.NewEncoder(&w.out), w.dt.name, msg)
   101  		return
   102  	}
   103  	fmt.Fprintln(&w.out, msg)
   104  }
   105  
   106  // A distTest is a test run by dist test.
   107  // Each test has a unique name and belongs to a group (heading)
   108  type distTest struct {
   109  	name    string // unique test name; may be filtered with -run flag
   110  	heading string // group section; this header is printed before the test is run.
   111  	fn      func(*distTest) error
   112  }
   113  
   114  func (t *tester) run() {
   115  	timelog("start", "dist test")
   116  
   117  	os.Setenv("PATH", fmt.Sprintf("%s%c%s", gorootBin, os.PathListSeparator, os.Getenv("PATH")))
   118  
   119  	t.short = true
   120  	if v := os.Getenv("GO_TEST_SHORT"); v != "" {
   121  		short, err := strconv.ParseBool(v)
   122  		if err != nil {
   123  			fatalf("invalid GO_TEST_SHORT %q: %v", v, err)
   124  		}
   125  		t.short = short
   126  	}
   127  
   128  	cmd := exec.Command(gorootBinGo, "env", "CGO_ENABLED")
   129  	cmd.Stderr = new(bytes.Buffer)
   130  	slurp, err := cmd.Output()
   131  	if err != nil {
   132  		fatalf("Error running %s: %v\n%s", cmd, err, cmd.Stderr)
   133  	}
   134  	parts := strings.Split(string(slurp), "\n")
   135  	if nlines := len(parts) - 1; nlines < 1 {
   136  		fatalf("Error running %s: output contains <1 lines\n%s", cmd, cmd.Stderr)
   137  	}
   138  	t.cgoEnabled, _ = strconv.ParseBool(parts[0])
   139  
   140  	if flag.NArg() > 0 && t.runRxStr != "" {
   141  		fatalf("the -run regular expression flag is mutually exclusive with test name arguments")
   142  	}
   143  
   144  	t.runNames = flag.Args()
   145  
   146  	// Set GOTRACEBACK to system if the user didn't set a level explicitly.
   147  	// Since we're running tests for Go, we want as much detail as possible
   148  	// if something goes wrong.
   149  	//
   150  	// Set it before running any commands just in case something goes wrong.
   151  	if ok := isEnvSet("GOTRACEBACK"); !ok {
   152  		if err := os.Setenv("GOTRACEBACK", "system"); err != nil {
   153  			if t.keepGoing {
   154  				log.Printf("Failed to set GOTRACEBACK: %v", err)
   155  			} else {
   156  				fatalf("Failed to set GOTRACEBACK: %v", err)
   157  			}
   158  		}
   159  	}
   160  
   161  	if t.rebuild {
   162  		t.out("Building packages and commands.")
   163  		// Force rebuild the whole toolchain.
   164  		goInstall(toolenv(), gorootBinGo, append([]string{"-a"}, toolchain...)...)
   165  	}
   166  
   167  	if !t.listMode {
   168  		if builder := os.Getenv("GO_BUILDER_NAME"); builder == "" {
   169  			// Ensure that installed commands are up to date, even with -no-rebuild,
   170  			// so that tests that run commands end up testing what's actually on disk.
   171  			// If everything is up-to-date, this is a no-op.
   172  			// We first build the toolchain twice to allow it to converge,
   173  			// as when we first bootstrap.
   174  			// See cmdbootstrap for a description of the overall process.
   175  			//
   176  			// On the builders, we skip this step: we assume that 'dist test' is
   177  			// already using the result of a clean build, and because of test sharding
   178  			// and virtualization we usually start with a clean GOCACHE, so we would
   179  			// end up rebuilding large parts of the standard library that aren't
   180  			// otherwise relevant to the actual set of packages under test.
   181  			goInstall(toolenv(), gorootBinGo, toolchain...)
   182  			goInstall(toolenv(), gorootBinGo, toolchain...)
   183  			goInstall(toolenv(), gorootBinGo, toolsToInstall...)
   184  		}
   185  	}
   186  
   187  	t.timeoutScale = 1
   188  	if s := os.Getenv("GO_TEST_TIMEOUT_SCALE"); s != "" {
   189  		t.timeoutScale, err = strconv.Atoi(s)
   190  		if err != nil {
   191  			fatalf("failed to parse $GO_TEST_TIMEOUT_SCALE = %q as integer: %v", s, err)
   192  		}
   193  	}
   194  
   195  	if t.runRxStr != "" {
   196  		if t.runRxStr[0] == '!' {
   197  			t.runRxWant = false
   198  			t.runRxStr = t.runRxStr[1:]
   199  		} else {
   200  			t.runRxWant = true
   201  		}
   202  		t.runRx = regexp.MustCompile(t.runRxStr)
   203  	}
   204  
   205  	t.registerTests()
   206  	if t.listMode {
   207  		for _, tt := range t.tests {
   208  			fmt.Println(tt.name)
   209  		}
   210  		return
   211  	}
   212  
   213  	for _, name := range t.runNames {
   214  		if !t.testNames[name] {
   215  			fatalf("unknown test %q", name)
   216  		}
   217  	}
   218  
   219  	// On a few builders, make GOROOT unwritable to catch tests writing to it.
   220  	if strings.HasPrefix(os.Getenv("GO_BUILDER_NAME"), "linux-") {
   221  		if os.Getuid() == 0 {
   222  			// Don't bother making GOROOT unwritable:
   223  			// we're running as root, so permissions would have no effect.
   224  		} else {
   225  			xatexit(t.makeGOROOTUnwritable())
   226  		}
   227  	}
   228  
   229  	if !t.json {
   230  		if err := t.maybeLogMetadata(); err != nil {
   231  			t.failed = true
   232  			if t.keepGoing {
   233  				log.Printf("Failed logging metadata: %v", err)
   234  			} else {
   235  				fatalf("Failed logging metadata: %v", err)
   236  			}
   237  		}
   238  	}
   239  
   240  	var anyIncluded, someExcluded bool
   241  	for _, dt := range t.tests {
   242  		if !t.shouldRunTest(dt.name) {
   243  			someExcluded = true
   244  			continue
   245  		}
   246  		anyIncluded = true
   247  		dt := dt // dt used in background after this iteration
   248  		if err := dt.fn(&dt); err != nil {
   249  			t.runPending(&dt) // in case that hasn't been done yet
   250  			t.failed = true
   251  			if t.keepGoing {
   252  				log.Printf("Failed: %v", err)
   253  			} else {
   254  				fatalf("Failed: %v", err)
   255  			}
   256  		}
   257  	}
   258  	t.runPending(nil)
   259  	timelog("end", "dist test")
   260  
   261  	if !t.json {
   262  		if t.failed {
   263  			fmt.Println("\nFAILED")
   264  		} else if !anyIncluded {
   265  			fmt.Println()
   266  			errprintf("go tool dist: warning: %q matched no tests; use the -list flag to list available tests\n", t.runRxStr)
   267  			fmt.Println("NO TESTS TO RUN")
   268  		} else if someExcluded {
   269  			fmt.Println("\nALL TESTS PASSED (some were excluded)")
   270  		} else {
   271  			fmt.Println("\nALL TESTS PASSED")
   272  		}
   273  	}
   274  	if t.failed {
   275  		xexit(1)
   276  	}
   277  }
   278  
   279  func (t *tester) shouldRunTest(name string) bool {
   280  	if t.runRx != nil {
   281  		return t.runRx.MatchString(name) == t.runRxWant
   282  	}
   283  	if len(t.runNames) == 0 {
   284  		return true
   285  	}
   286  	return slices.Contains(t.runNames, name)
   287  }
   288  
   289  func (t *tester) maybeLogMetadata() error {
   290  	if t.compileOnly {
   291  		// We need to run a subprocess to log metadata. Don't do that
   292  		// on compile-only runs.
   293  		return nil
   294  	}
   295  	t.out("Test execution environment.")
   296  	// Helper binary to print system metadata (CPU model, etc). This is a
   297  	// separate binary from dist so it need not build with the bootstrap
   298  	// toolchain.
   299  	//
   300  	// TODO(prattmic): If we split dist bootstrap and dist test then this
   301  	// could be simplified to directly use internal/sysinfo here.
   302  	return t.dirCmd(filepath.Join(goroot, "src/cmd/internal/metadata"), gorootBinGo, []string{"run", "main.go"}).Run()
   303  }
   304  
   305  // testName returns the dist test name for a given package and variant.
   306  func testName(pkg, variant string) string {
   307  	name := pkg
   308  	if variant != "" {
   309  		name += ":" + variant
   310  	}
   311  	return name
   312  }
   313  
   314  // goTest represents all options to a "go test" command. The final command will
   315  // combine configuration from goTest and tester flags.
   316  type goTest struct {
   317  	short    bool     // If true, force -short
   318  	tags     []string // Build tags
   319  	race     bool     // Force -race
   320  	bench    bool     // Run benchmarks (briefly), not tests.
   321  	runTests string   // Regexp of tests to run
   322  	cpu      string   // If non-empty, -cpu flag
   323  	skip     string   // If non-empty, -skip flag
   324  
   325  	gcflags   string // If non-empty, build with -gcflags=all=X
   326  	ldflags   string // If non-empty, build with -ldflags=X
   327  	buildmode string // If non-empty, -buildmode flag
   328  
   329  	env []string // Environment variables to add, as KEY=VAL. KEY= unsets a variable
   330  
   331  	// timeout optionally raises the per-package test timeout to be at least this long.
   332  	// The zero value means to stay with the default test timeout.
   333  	// When adding new tests, this field generally doesn't need to be set, not unless
   334  	// the go commmand's default test timeout proves to be insufficient.
   335  	//
   336  	// In either case, the per-package test timeout get scaled by a multiplier,
   337  	// and applied only if the end result is longer than the go command's default
   338  	// test timeout.
   339  	timeout time.Duration
   340  
   341  	runOnHost bool // When cross-compiling, run this test on the host instead of guest
   342  
   343  	// variant, if non-empty, is a name used to distinguish different
   344  	// configurations of the same test package(s). If set, the Package field
   345  	// in test2json output is rewritten to pkg:variant.
   346  	variant string
   347  
   348  	// We have both pkg and pkgs as a convenience. Both may be set, in which
   349  	// case they will be combined. At least one must be set.
   350  	pkgs []string // Multiple packages to test
   351  	pkg  string   // A single package to test
   352  
   353  	testFlags []string // Additional flags accepted by this test
   354  }
   355  
   356  // compileOnly reports whether this test is only for compiling,
   357  // indicated by runTests being set to '^$' and bench being false.
   358  func (opts *goTest) compileOnly() bool {
   359  	return opts.runTests == "^$" && !opts.bench
   360  }
   361  
   362  // scaledTimeout reports the per-package test timeout scaled by t.timeoutScale.
   363  func (opts *goTest) scaledTimeout(t *tester) time.Duration {
   364  	d := goTestDefaultTimeout
   365  	if opts.timeout != 0 {
   366  		d = opts.timeout
   367  	}
   368  	d *= time.Duration(t.timeoutScale)
   369  	return d
   370  }
   371  
   372  const goTestDefaultTimeout = 10 * time.Minute // Default value of go test -timeout flag.
   373  
   374  // bgCommand returns a go test Cmd and a post-Run flush function. The result
   375  // will write its output to stdout and stderr. If stdout==stderr, bgCommand
   376  // ensures Writes are serialized. The caller should call flush() after Cmd exits.
   377  func (opts *goTest) bgCommand(t *tester, stdout, stderr io.Writer) (cmd *exec.Cmd, flush func()) {
   378  	build, run, pkgs, testFlags, setupCmd := opts.buildArgs(t)
   379  
   380  	// Combine the flags.
   381  	args := append([]string{"test"}, build...)
   382  	if t.compileOnly || opts.compileOnly() {
   383  		args = append(args, "-c", "-o", os.DevNull)
   384  	} else {
   385  		args = append(args, run...)
   386  	}
   387  	args = append(args, pkgs...)
   388  	if !t.compileOnly && !opts.compileOnly() {
   389  		args = append(args, testFlags...)
   390  	}
   391  
   392  	cmd = exec.Command(gorootBinGo, args...)
   393  	setupCmd(cmd)
   394  	if t.json && opts.variant != "" {
   395  		// Rewrite Package in the JSON output to be pkg:variant.
   396  		//
   397  		// We only want to process JSON on the child's stdout. Ideally if
   398  		// stdout==stderr, we would also use the same testJSONFilter for
   399  		// cmd.Stdout and cmd.Stderr in order to keep the underlying
   400  		// interleaving of writes, but then it would see even partial writes
   401  		// interleaved, which would corrupt the JSON. So, we only process
   402  		// cmd.Stdout. This has another consequence though: if stdout==stderr,
   403  		// we have to serialize Writes in case the Writer is not concurrent
   404  		// safe. If we were just passing stdout/stderr through to exec, it would
   405  		// do this for us, but since we're wrapping stdout, we have to do it
   406  		// ourselves.
   407  		if stdout == stderr {
   408  			stdout = &lockedWriter{w: stdout}
   409  			stderr = stdout
   410  		}
   411  		f := &testJSONFilter{w: stdout, variant: opts.variant}
   412  		cmd.Stdout = f
   413  		flush = f.Flush
   414  	} else {
   415  		cmd.Stdout = stdout
   416  		flush = func() {}
   417  	}
   418  	cmd.Stderr = stderr
   419  
   420  	return cmd, flush
   421  }
   422  
   423  // run runs a go test and returns an error if it does not succeed.
   424  func (opts *goTest) run(t *tester) error {
   425  	cmd, flush := opts.bgCommand(t, os.Stdout, os.Stderr)
   426  	err := cmd.Run()
   427  	flush()
   428  	return err
   429  }
   430  
   431  // buildArgs is in internal helper for goTest that constructs the elements of
   432  // the "go test" command line. build is the flags for building the test. run is
   433  // the flags for running the test. pkgs is the list of packages to build and
   434  // run. testFlags is the list of flags to pass to the test package.
   435  //
   436  // The caller must call setupCmd on the resulting exec.Cmd to set its directory
   437  // and environment.
   438  func (opts *goTest) buildArgs(t *tester) (build, run, pkgs, testFlags []string, setupCmd func(*exec.Cmd)) {
   439  	run = append(run, "-count=1") // Disallow caching.
   440  	if d := opts.scaledTimeout(t); d > goTestDefaultTimeout {
   441  		run = append(run, "-timeout="+d.String())
   442  	}
   443  	if opts.short || t.short {
   444  		run = append(run, "-short")
   445  	}
   446  	var tags []string
   447  	if noOpt {
   448  		tags = append(tags, "noopt")
   449  	}
   450  	tags = append(tags, opts.tags...)
   451  	if len(tags) > 0 {
   452  		build = append(build, "-tags="+strings.Join(tags, ","))
   453  	}
   454  	if t.race || opts.race {
   455  		build = append(build, "-race")
   456  	}
   457  	if t.msan {
   458  		build = append(build, "-msan")
   459  	}
   460  	if t.asan {
   461  		build = append(build, "-asan")
   462  	}
   463  	if opts.bench {
   464  		// Run no tests.
   465  		run = append(run, "-run=^$")
   466  		// Run benchmarks briefly as a smoke test.
   467  		run = append(run, "-bench=.*", "-benchtime=.1s")
   468  	} else if opts.runTests != "" {
   469  		run = append(run, "-run="+opts.runTests)
   470  	}
   471  	if opts.cpu != "" {
   472  		run = append(run, "-cpu="+opts.cpu)
   473  	}
   474  	if opts.skip != "" {
   475  		run = append(run, "-skip="+opts.skip)
   476  	}
   477  	if t.json {
   478  		run = append(run, "-json")
   479  	}
   480  
   481  	if opts.gcflags != "" {
   482  		build = append(build, "-gcflags=all="+opts.gcflags)
   483  	}
   484  	if opts.ldflags != "" {
   485  		build = append(build, "-ldflags="+opts.ldflags)
   486  	}
   487  	if t.asmflags != "" {
   488  		build = append(build, "-asmflags="+t.asmflags)
   489  	}
   490  	if opts.buildmode != "" {
   491  		build = append(build, "-buildmode="+opts.buildmode)
   492  	}
   493  
   494  	pkgs = opts.packages()
   495  
   496  	runOnHost := opts.runOnHost && (goarch != gohostarch || goos != gohostos)
   497  	needTestFlags := len(opts.testFlags) > 0 || runOnHost
   498  	if needTestFlags {
   499  		testFlags = append([]string{"-args"}, opts.testFlags...)
   500  	}
   501  	if runOnHost {
   502  		// -target is a special flag understood by tests that can run on the host
   503  		testFlags = append(testFlags, "-target="+goos+"/"+goarch)
   504  	}
   505  
   506  	setupCmd = func(cmd *exec.Cmd) {
   507  		setDir(cmd, filepath.Join(goroot, "src"))
   508  		if len(opts.env) != 0 {
   509  			for _, kv := range opts.env {
   510  				if i := strings.Index(kv, "="); i < 0 {
   511  					unsetEnv(cmd, kv[:len(kv)-1])
   512  				} else {
   513  					setEnv(cmd, kv[:i], kv[i+1:])
   514  				}
   515  			}
   516  		}
   517  		if runOnHost {
   518  			setEnv(cmd, "GOARCH", gohostarch)
   519  			setEnv(cmd, "GOOS", gohostos)
   520  		}
   521  	}
   522  
   523  	return
   524  }
   525  
   526  // packages returns the full list of packages to be run by this goTest. This
   527  // will always include at least one package.
   528  func (opts *goTest) packages() []string {
   529  	pkgs := opts.pkgs
   530  	if opts.pkg != "" {
   531  		pkgs = append(pkgs[:len(pkgs):len(pkgs)], opts.pkg)
   532  	}
   533  	if len(pkgs) == 0 {
   534  		panic("no packages")
   535  	}
   536  	return pkgs
   537  }
   538  
   539  // printSkip prints a skip message for all of goTest.
   540  func (opts *goTest) printSkip(t *tester, msg string) {
   541  	if t.json {
   542  		enc := json.NewEncoder(os.Stdout)
   543  		for _, pkg := range opts.packages() {
   544  			synthesizeSkipEvent(enc, pkg, msg)
   545  		}
   546  		return
   547  	}
   548  	fmt.Println(msg)
   549  }
   550  
   551  // ranGoTest and stdMatches are state closed over by the stdlib
   552  // testing func in registerStdTest below. The tests are run
   553  // sequentially, so there's no need for locks.
   554  //
   555  // ranGoBench and benchMatches are the same, but are only used
   556  // in -race mode.
   557  var (
   558  	ranGoTest  bool
   559  	stdMatches []string
   560  
   561  	ranGoBench   bool
   562  	benchMatches []string
   563  )
   564  
   565  func (t *tester) registerStdTest(pkg string) {
   566  	const stdTestHeading = "Testing packages." // known to addTest for a safety check
   567  	gcflags := gogcflags
   568  	name := testName(pkg, "")
   569  	if t.runRx == nil || t.runRx.MatchString(name) == t.runRxWant {
   570  		stdMatches = append(stdMatches, pkg)
   571  	}
   572  	t.addTest(name, stdTestHeading, func(dt *distTest) error {
   573  		if ranGoTest {
   574  			return nil
   575  		}
   576  		t.runPending(dt)
   577  		timelog("start", dt.name)
   578  		defer timelog("end", dt.name)
   579  		ranGoTest = true
   580  
   581  		return (&goTest{
   582  			gcflags: gcflags,
   583  			pkgs:    stdMatches,
   584  		}).run(t)
   585  	})
   586  }
   587  
   588  func (t *tester) registerRaceBenchTest(pkg string) {
   589  	const raceBenchHeading = "Running benchmarks briefly." // known to addTest for a safety check
   590  	name := testName(pkg, "racebench")
   591  	if t.runRx == nil || t.runRx.MatchString(name) == t.runRxWant {
   592  		benchMatches = append(benchMatches, pkg)
   593  	}
   594  	t.addTest(name, raceBenchHeading, func(dt *distTest) error {
   595  		if ranGoBench {
   596  			return nil
   597  		}
   598  		t.runPending(dt)
   599  		timelog("start", dt.name)
   600  		defer timelog("end", dt.name)
   601  		ranGoBench = true
   602  		return (&goTest{
   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  			variant: "racebench",
   607  			timeout: 20 * time.Minute, // 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  				tags:    []string{"osusergo"},
   699  				pkg:     "os/user",
   700  			})
   701  	}
   702  
   703  	// Tests that the nethttpomithttp2 build tag doesn't rot too much,
   704  	// even if there's not a regular builder on it.
   705  	t.registerTest("net/http with tag nethttpomithttp2", &goTest{
   706  		variant: "nethttpomithttp2",
   707  		tags:    []string{"nethttpomithttp2"},
   708  		pkg:     "net/http",
   709  	})
   710  
   711  	// Check that all crypto packages compile with the purego build tag.
   712  	t.registerTest("crypto with tag purego (build and vet only)", &goTest{
   713  		variant:  "purego",
   714  		tags:     []string{"purego"},
   715  		pkg:      "crypto/...",
   716  		runTests: "^$", // only ensure they compile
   717  	})
   718  
   719  	// Check that all crypto packages compile (and test correctly, in longmode) with fips.
   720  	if t.fipsSupported() {
   721  		// Test standard crypto packages with fips140=on.
   722  		t.registerTest("GOFIPS140=latest go test crypto/...", &goTest{
   723  			variant: "gofips140",
   724  			env:     []string{"GOFIPS140=latest"},
   725  			pkg:     "crypto/...",
   726  		})
   727  
   728  		// Test that earlier FIPS snapshots build.
   729  		// In long mode, test that they work too.
   730  		for _, version := range fipsVersions() {
   731  			suffix := " # (build and vet only)"
   732  			run := "^$" // only ensure they compile
   733  			if !t.short {
   734  				suffix = ""
   735  				run = ""
   736  			}
   737  			t.registerTest("GOFIPS140="+version+" go test crypto/..."+suffix, &goTest{
   738  				variant:  "gofips140-" + version,
   739  				pkg:      "crypto/...",
   740  				runTests: run,
   741  				env:      []string{"GOFIPS140=" + version, "GOMODCACHE=" + filepath.Join(workdir, "fips-"+version)},
   742  			})
   743  		}
   744  	}
   745  
   746  	// Test GOEXPERIMENT=nojsonv2.
   747  	if !strings.Contains(goexperiment, "nojsonv2") {
   748  		t.registerTest("GOEXPERIMENT=nojsonv2 go test encoding/json/...", &goTest{
   749  			variant: "nojsonv2",
   750  			env:     []string{"GOEXPERIMENT=" + goexperiments("nojsonv2")},
   751  			pkg:     "encoding/json/...",
   752  		})
   753  	}
   754  
   755  	// Test GOEXPERIMENT=runtimesecret.
   756  	if !strings.Contains(goexperiment, "runtimesecret") {
   757  		t.registerTest("GOEXPERIMENT=runtimesecret go test runtime/secret/...", &goTest{
   758  			variant: "runtimesecret",
   759  			env:     []string{"GOEXPERIMENT=" + goexperiments("runtimesecret")},
   760  			pkg:     "runtime/secret/...",
   761  		})
   762  	}
   763  
   764  	// Test GOEXPERIMENT=simd.
   765  	if !strings.Contains(goexperiment, "simd") {
   766  		// simd package is portable.
   767  		t.registerTest("GOEXPERIMENT=simd go test simd", &goTest{
   768  			variant: "simd",
   769  			env:     []string{"GOEXPERIMENT=" + goexperiments("simd")},
   770  			pkg:     "simd",
   771  		})
   772  		// simd/archsimd supports amd64, arm64, and wasm.
   773  		archsimdSupported := goarch == "amd64" || goarch == "arm64" || goarch == "wasm"
   774  		if archsimdSupported {
   775  			t.registerTest("GOEXPERIMENT=simd go test simd/archsimd/...", &goTest{
   776  				variant: "simd",
   777  				env:     []string{"GOEXPERIMENT=" + goexperiments("simd")},
   778  				pkg:     "simd/archsimd/...",
   779  			})
   780  		}
   781  	}
   782  
   783  	// Test ios/amd64 for the iOS simulator.
   784  	if goos == "darwin" && goarch == "amd64" && t.cgoEnabled {
   785  		t.registerTest("GOOS=ios on darwin/amd64",
   786  			&goTest{
   787  				variant:  "amd64ios",
   788  				runTests: "SystemRoots",
   789  				env:      []string{"GOOS=ios", "CGO_ENABLED=1"},
   790  				pkg:      "crypto/x509",
   791  			})
   792  	}
   793  
   794  	// GC debug mode tests. We only run these in long-test mode
   795  	// (with GO_TEST_SHORT=0) because this is just testing a
   796  	// non-critical debug setting.
   797  	if !t.compileOnly && !t.short {
   798  		t.registerTest("GODEBUG=gcstoptheworld=2 archive/zip",
   799  			&goTest{
   800  				variant: "gcstoptheworld2",
   801  				short:   true,
   802  				env:     []string{"GODEBUG=gcstoptheworld=2"},
   803  				pkg:     "archive/zip",
   804  			})
   805  		t.registerTest("GODEBUG=gccheckmark=1 runtime",
   806  			&goTest{
   807  				variant: "gccheckmark",
   808  				short:   true,
   809  				env:     []string{"GODEBUG=gccheckmark=1"},
   810  				pkg:     "runtime",
   811  			})
   812  	}
   813  
   814  	// Spectre mitigation smoke test.
   815  	if goos == "linux" && goarch == "amd64" && !(gogcflags == "-spectre=all" && t.asmflags == "all=-spectre=all") {
   816  		// Pick a bunch of packages known to have some assembly.
   817  		pkgs := []string{"internal/runtime/...", "reflect", "crypto/..."}
   818  		if !t.short {
   819  			pkgs = append(pkgs, "runtime")
   820  		}
   821  		t.registerTest("spectre",
   822  			&goTest{
   823  				variant: "spectre",
   824  				short:   true,
   825  				env:     []string{"GOFLAGS=-gcflags=all=-spectre=all -asmflags=all=-spectre=all"},
   826  				pkgs:    pkgs,
   827  			})
   828  	}
   829  
   830  	// morestack tests. We only run these in long-test mode
   831  	// (with GO_TEST_SHORT=0) because the runtime test is
   832  	// already quite long and mayMoreStackMove makes it about
   833  	// twice as slow.
   834  	if !t.compileOnly && !t.short {
   835  		// hooks is the set of maymorestack hooks to test with.
   836  		hooks := []string{"mayMoreStackPreempt", "mayMoreStackMove"}
   837  		// hookPkgs is the set of package patterns to apply
   838  		// the maymorestack hook to.
   839  		hookPkgs := []string{"runtime/...", "reflect", "sync"}
   840  		// unhookPkgs is the set of package patterns to
   841  		// exclude from hookPkgs.
   842  		unhookPkgs := []string{"runtime/testdata/..."}
   843  		for _, hook := range hooks {
   844  			// Construct the build flags to use the
   845  			// maymorestack hook in the compiler and
   846  			// assembler. We pass this via the GOFLAGS
   847  			// environment variable so that it applies to
   848  			// both the test itself and to binaries built
   849  			// by the test.
   850  			goFlagsList := []string{}
   851  			for _, flag := range []string{"-gcflags", "-asmflags"} {
   852  				for _, hookPkg := range hookPkgs {
   853  					goFlagsList = append(goFlagsList, flag+"="+hookPkg+"=-d=maymorestack=runtime."+hook)
   854  				}
   855  				for _, unhookPkg := range unhookPkgs {
   856  					goFlagsList = append(goFlagsList, flag+"="+unhookPkg+"=")
   857  				}
   858  			}
   859  			goFlags := strings.Join(goFlagsList, " ")
   860  
   861  			t.registerTest("maymorestack="+hook,
   862  				&goTest{
   863  					variant: hook,
   864  					short:   true,
   865  					env:     []string{"GOFLAGS=" + goFlags},
   866  					pkgs:    []string{"runtime", "reflect", "sync"},
   867  				})
   868  		}
   869  	}
   870  
   871  	// Test that internal linking of standard packages does not
   872  	// require libgcc. This ensures that we can install a Go
   873  	// release on a system that does not have a C compiler
   874  	// installed and still build Go programs (that don't use cgo).
   875  	for _, pkg := range cgoPackages {
   876  		if !t.internalLink() {
   877  			break
   878  		}
   879  
   880  		// ARM libgcc may be Thumb, which internal linking does not support.
   881  		if goarch == "arm" {
   882  			break
   883  		}
   884  
   885  		// What matters is that the tests build and start up.
   886  		// Skip expensive tests, especially x509 TestSystemRoots.
   887  		run := "^Test[^CS]"
   888  		if pkg == "net" {
   889  			run = "TestTCPStress"
   890  		}
   891  		t.registerTest("Testing without libgcc.",
   892  			&goTest{
   893  				variant:  "nolibgcc",
   894  				ldflags:  "-linkmode=internal -libgcc=none",
   895  				runTests: run,
   896  				pkg:      pkg,
   897  			})
   898  	}
   899  
   900  	// Stub out following test on alpine until 54354 resolved.
   901  	builderName := os.Getenv("GO_BUILDER_NAME")
   902  	disablePIE := strings.HasSuffix(builderName, "-alpine")
   903  
   904  	// Test internal linking of PIE binaries where it is supported.
   905  	if t.internalLinkPIE() && !disablePIE {
   906  		t.registerTest("internal linking, -buildmode=pie",
   907  			&goTest{
   908  				variant:   "pie_internal",
   909  				buildmode: "pie",
   910  				ldflags:   "-linkmode=internal",
   911  				env:       []string{"CGO_ENABLED=0"},
   912  				pkg:       "reflect",
   913  			})
   914  		t.registerTest("internal linking, -buildmode=pie",
   915  			&goTest{
   916  				variant:   "pie_internal",
   917  				buildmode: "pie",
   918  				ldflags:   "-linkmode=internal",
   919  				env:       []string{"CGO_ENABLED=0"},
   920  				pkg:       "crypto/internal/fips140test",
   921  				runTests:  "TestFIPSCheck",
   922  			})
   923  		// Also test a cgo package.
   924  		if t.cgoEnabled && t.internalLink() && !disablePIE {
   925  			t.registerTest("internal linking, -buildmode=pie",
   926  				&goTest{
   927  					variant:   "pie_internal",
   928  					buildmode: "pie",
   929  					ldflags:   "-linkmode=internal",
   930  					pkg:       "os/user",
   931  				})
   932  		}
   933  	}
   934  
   935  	if t.extLink() && !t.compileOnly {
   936  		if goos != "android" { // Android does not support non-PIE linking
   937  			t.registerTest("external linking, -buildmode=exe",
   938  				&goTest{
   939  					variant:   "exe_external",
   940  					buildmode: "exe",
   941  					ldflags:   "-linkmode=external",
   942  					env:       []string{"CGO_ENABLED=1"},
   943  					pkg:       "crypto/internal/fips140test",
   944  					runTests:  "TestFIPSCheck",
   945  				})
   946  		}
   947  		if t.externalLinkPIE() && !disablePIE {
   948  			t.registerTest("external linking, -buildmode=pie",
   949  				&goTest{
   950  					variant:   "pie_external",
   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  				cpu:     "10",
   966  				pkg:     "sync",
   967  			})
   968  	}
   969  
   970  	const cgoHeading = "Testing cgo"
   971  	if t.cgoEnabled {
   972  		t.registerCgoTests(cgoHeading)
   973  	}
   974  
   975  	if goos == "wasip1" {
   976  		t.registerTest("wasip1 host tests",
   977  			&goTest{
   978  				variant:   "host",
   979  				pkg:       "internal/runtime/wasitest",
   980  				runOnHost: true,
   981  			})
   982  	}
   983  
   984  	// Only run the API check on fast development platforms.
   985  	// Every platform checks the API on every GOOS/GOARCH/CGO_ENABLED combination anyway,
   986  	// so we really only need to run this check once anywhere to get adequate coverage.
   987  	// To help developers avoid trybot-only failures, we try to run on typical developer machines
   988  	// which is darwin,linux,windows/amd64 and darwin/arm64.
   989  	//
   990  	// The same logic applies to the release notes that correspond to each api/next file.
   991  	//
   992  	// TODO: remove the exclusion of goexperiment simd right before dev.simd branch is merged to master.
   993  	if goos == "darwin" || ((goos == "linux" || goos == "windows") && (goarch == "amd64" && !strings.Contains(goexperiment, "simd"))) {
   994  		t.registerTest("API release note check", &goTest{variant: "check", pkg: "cmd/relnote", testFlags: []string{"-check"}})
   995  		t.registerTest("API check", &goTest{variant: "check", pkg: "cmd/api", testFlags: []string{"-check"}})
   996  	}
   997  
   998  	// Runtime CPU tests.
   999  	if !t.compileOnly && t.hasParallelism() {
  1000  		for i := 1; i <= 4; i *= 2 {
  1001  			t.registerTest(fmt.Sprintf("GOMAXPROCS=2 runtime -cpu=%d -quick", i),
  1002  				&goTest{
  1003  					variant:   "cpu" + strconv.Itoa(i),
  1004  					cpu:       strconv.Itoa(i),
  1005  					gcflags:   gogcflags,
  1006  					short:     true,
  1007  					testFlags: []string{"-quick"},
  1008  					// We set GOMAXPROCS=2 in addition to -cpu=1,2,4 in order to test runtime bootstrap code,
  1009  					// creation of first goroutines and first garbage collections in the parallel setting.
  1010  					env: []string{"GOMAXPROCS=2"},
  1011  					pkg: "runtime",
  1012  				})
  1013  		}
  1014  	}
  1015  
  1016  	if t.raceDetectorSupported() && !t.msan && !t.asan {
  1017  		// N.B. -race is incompatible with -msan and -asan.
  1018  		t.registerRaceTests()
  1019  	}
  1020  
  1021  	if goos != "android" && !t.iOS() {
  1022  		// Only start multiple test dir shards on builders,
  1023  		// where they get distributed to multiple machines.
  1024  		// See issues 20141 and 31834.
  1025  		nShards := 1
  1026  		if os.Getenv("GO_BUILDER_NAME") != "" {
  1027  			nShards = 10
  1028  		}
  1029  		if n, err := strconv.Atoi(os.Getenv("GO_TEST_SHARDS")); err == nil {
  1030  			nShards = n
  1031  		}
  1032  		for shard := 0; shard < nShards; shard++ {
  1033  			id := fmt.Sprintf("%d_%d", shard, nShards)
  1034  			t.registerTest("../test",
  1035  				&goTest{
  1036  					// Include the variant even though there's no overlap in test names.
  1037  					// This makes the test target more clearly distinct in our build
  1038  					// results and is important for load-balancing test shards.
  1039  					variant:   id,
  1040  					pkg:       "cmd/internal/testdir",
  1041  					testFlags: []string{fmt.Sprintf("-shard=%d", shard), fmt.Sprintf("-shards=%d", nShards)},
  1042  					runOnHost: true,
  1043  				},
  1044  			)
  1045  		}
  1046  	}
  1047  }
  1048  
  1049  // addTest adds an arbitrary test callback to the test list.
  1050  //
  1051  // name must uniquely identify the test and heading must be non-empty.
  1052  func (t *tester) addTest(name, heading string, fn func(*distTest) error) {
  1053  	if t.testNames[name] {
  1054  		panic("duplicate registered test name " + name)
  1055  	}
  1056  	if heading == "" {
  1057  		panic("empty heading")
  1058  	}
  1059  	// Two simple checks for cases that would conflict with the fast path in registerTests.
  1060  	if !strings.Contains(name, ":") && heading != "Testing packages." {
  1061  		panic("empty variant is reserved exclusively for registerStdTest")
  1062  	} else if strings.HasSuffix(name, ":racebench") && heading != "Running benchmarks briefly." {
  1063  		panic("racebench variant is reserved exclusively for registerRaceBenchTest")
  1064  	}
  1065  	if t.testNames == nil {
  1066  		t.testNames = make(map[string]bool)
  1067  	}
  1068  	t.testNames[name] = true
  1069  	t.tests = append(t.tests, distTest{
  1070  		name:    name,
  1071  		heading: heading,
  1072  		fn:      fn,
  1073  	})
  1074  }
  1075  
  1076  type registerTestOpt interface {
  1077  	isRegisterTestOpt()
  1078  }
  1079  
  1080  // rtSkipFunc is a registerTest option that runs a skip check function before
  1081  // running the test.
  1082  type rtSkipFunc struct {
  1083  	skip func(*distTest) (string, bool) // Return message, true to skip the test
  1084  }
  1085  
  1086  func (rtSkipFunc) isRegisterTestOpt() {}
  1087  
  1088  // registerTest registers a test that runs the given goTest.
  1089  //
  1090  // Each Go package in goTest will have a corresponding test
  1091  // "<pkg>:<variant>", which must uniquely identify the test.
  1092  //
  1093  // heading and test.variant must be non-empty.
  1094  func (t *tester) registerTest(heading string, test *goTest, opts ...registerTestOpt) {
  1095  	var skipFunc func(*distTest) (string, bool)
  1096  	for _, opt := range opts {
  1097  		switch opt := opt.(type) {
  1098  		case rtSkipFunc:
  1099  			skipFunc = opt.skip
  1100  		}
  1101  	}
  1102  	// Register each test package as a separate test.
  1103  	register1 := func(test *goTest) {
  1104  		if test.variant == "" {
  1105  			panic("empty variant")
  1106  		}
  1107  		name := testName(test.pkg, test.variant)
  1108  		t.addTest(name, heading, func(dt *distTest) error {
  1109  			if skipFunc != nil {
  1110  				msg, skip := skipFunc(dt)
  1111  				if skip {
  1112  					test.printSkip(t, msg)
  1113  					return nil
  1114  				}
  1115  			}
  1116  			w := &work{dt: dt}
  1117  			w.cmd, w.flush = test.bgCommand(t, &w.out, &w.out)
  1118  			t.worklist = append(t.worklist, w)
  1119  			return nil
  1120  		})
  1121  	}
  1122  	if test.pkg != "" && len(test.pkgs) == 0 {
  1123  		// Common case. Avoid copying.
  1124  		register1(test)
  1125  		return
  1126  	}
  1127  	// TODO(dmitshur,austin): It might be better to unify the execution of 'go test pkg'
  1128  	// invocations for the same variant to be done with a single 'go test pkg1 pkg2 pkg3'
  1129  	// command, just like it's already done in registerStdTest and registerRaceBenchTest.
  1130  	// Those methods accumulate matched packages in stdMatches and benchMatches slices,
  1131  	// and we can extend that mechanism to work for all other equal variant registrations.
  1132  	// Do the simple thing to start with.
  1133  	for _, pkg := range test.packages() {
  1134  		test1 := *test
  1135  		test1.pkg, test1.pkgs = pkg, nil
  1136  		register1(&test1)
  1137  	}
  1138  }
  1139  
  1140  // dirCmd constructs a Cmd intended to be run in the foreground.
  1141  // The command will be run in dir, and Stdout and Stderr will go to os.Stdout
  1142  // and os.Stderr.
  1143  func (t *tester) dirCmd(dir string, cmdline ...any) *exec.Cmd {
  1144  	bin, args := flattenCmdline(cmdline)
  1145  	cmd := exec.Command(bin, args...)
  1146  	if filepath.IsAbs(dir) {
  1147  		setDir(cmd, dir)
  1148  	} else {
  1149  		setDir(cmd, filepath.Join(goroot, dir))
  1150  	}
  1151  	cmd.Stdout = os.Stdout
  1152  	cmd.Stderr = os.Stderr
  1153  	if vflag > 1 {
  1154  		errprintf("%#q\n", cmd)
  1155  	}
  1156  	return cmd
  1157  }
  1158  
  1159  // flattenCmdline flattens a mixture of string and []string as single list
  1160  // and then interprets it as a command line: first element is binary, then args.
  1161  func flattenCmdline(cmdline []any) (bin string, args []string) {
  1162  	var list []string
  1163  	for _, x := range cmdline {
  1164  		switch x := x.(type) {
  1165  		case string:
  1166  			list = append(list, x)
  1167  		case []string:
  1168  			list = append(list, x...)
  1169  		default:
  1170  			panic("invalid dirCmd argument type: " + reflect.TypeOf(x).String())
  1171  		}
  1172  	}
  1173  
  1174  	bin = list[0]
  1175  	if !filepath.IsAbs(bin) {
  1176  		panic("command is not absolute: " + bin)
  1177  	}
  1178  	return bin, list[1:]
  1179  }
  1180  
  1181  func (t *tester) iOS() bool {
  1182  	return goos == "ios"
  1183  }
  1184  
  1185  func (t *tester) out(v string) {
  1186  	if t.json {
  1187  		return
  1188  	}
  1189  	if t.banner == "" {
  1190  		return
  1191  	}
  1192  	fmt.Println("\n" + t.banner + v)
  1193  }
  1194  
  1195  // extLink reports whether the current goos/goarch supports
  1196  // external linking.
  1197  func (t *tester) extLink() bool {
  1198  	if !cgoEnabled[goos+"/"+goarch] {
  1199  		return false
  1200  	}
  1201  	if goarch == "ppc64" && goos != "aix" && goos != "linux" {
  1202  		return false
  1203  	}
  1204  	return true
  1205  }
  1206  
  1207  func (t *tester) internalLink() bool {
  1208  	if gohostos == "dragonfly" {
  1209  		// linkmode=internal fails on dragonfly since errno is a TLS relocation.
  1210  		return false
  1211  	}
  1212  	if goos == "android" {
  1213  		return false
  1214  	}
  1215  	if goos == "ios" {
  1216  		return false
  1217  	}
  1218  	// Internally linking cgo is incomplete on some architectures.
  1219  	// https://golang.org/issue/10373
  1220  	// https://golang.org/issue/14449
  1221  	if goarch == "mips64" || goarch == "mips64le" || goarch == "mips" || goarch == "mipsle" || goarch == "riscv64" {
  1222  		return false
  1223  	}
  1224  	if goos == "aix" {
  1225  		// linkmode=internal isn't supported.
  1226  		return false
  1227  	}
  1228  	if t.msan || t.asan {
  1229  		// linkmode=internal isn't supported by msan or asan.
  1230  		return false
  1231  	}
  1232  	return true
  1233  }
  1234  
  1235  func (t *tester) internalLinkPIE() bool {
  1236  	if t.msan || t.asan {
  1237  		// linkmode=internal isn't supported by msan or asan.
  1238  		return false
  1239  	}
  1240  	switch goos + "-" + goarch {
  1241  	case "darwin-amd64", "darwin-arm64",
  1242  		"linux-amd64", "linux-arm64", "linux-loong64", "linux-ppc64", "linux-ppc64le", "linux-s390x",
  1243  		"android-arm64",
  1244  		"windows-amd64", "windows-386", "windows-arm64":
  1245  		return true
  1246  	}
  1247  	return false
  1248  }
  1249  
  1250  func (t *tester) externalLinkPIE() bool {
  1251  	// General rule is if -buildmode=pie and -linkmode=external both work, then they work together.
  1252  	return t.internalLinkPIE() && t.extLink()
  1253  }
  1254  
  1255  // supportedBuildmode reports whether the given build mode is supported.
  1256  func (t *tester) supportedBuildmode(mode string) bool {
  1257  	switch mode {
  1258  	case "c-archive", "c-shared", "shared", "plugin", "pie":
  1259  	default:
  1260  		fatalf("internal error: unknown buildmode %s", mode)
  1261  		return false
  1262  	}
  1263  
  1264  	return buildModeSupported("gc", mode, goos, goarch)
  1265  }
  1266  
  1267  func (t *tester) registerCgoTests(heading string) {
  1268  	cgoTest := func(variant string, subdir, linkmode, buildmode string, opts ...registerTestOpt) *goTest {
  1269  		gt := &goTest{
  1270  			variant:   variant,
  1271  			pkg:       "cmd/cgo/internal/" + subdir,
  1272  			buildmode: buildmode,
  1273  		}
  1274  		var ldflags []string
  1275  		if linkmode != "auto" {
  1276  			// "auto" is the default, so avoid cluttering the command line for "auto"
  1277  			ldflags = append(ldflags, "-linkmode="+linkmode)
  1278  		}
  1279  
  1280  		if linkmode == "internal" {
  1281  			gt.tags = append(gt.tags, "internal")
  1282  			if buildmode == "pie" {
  1283  				gt.tags = append(gt.tags, "internal_pie")
  1284  			}
  1285  		}
  1286  		if buildmode == "static" {
  1287  			// This isn't actually a Go buildmode, just a convenient way to tell
  1288  			// cgoTest we want static linking.
  1289  			gt.buildmode = ""
  1290  			switch linkmode {
  1291  			case "external":
  1292  				ldflags = append(ldflags, `-extldflags "-static -pthread"`)
  1293  			case "auto":
  1294  				gt.env = append(gt.env, "CGO_LDFLAGS=-static -pthread")
  1295  			default:
  1296  				panic("unknown linkmode with static build: " + linkmode)
  1297  			}
  1298  			gt.tags = append(gt.tags, "static")
  1299  		}
  1300  		gt.ldflags = strings.Join(ldflags, " ")
  1301  
  1302  		t.registerTest(heading, gt, opts...)
  1303  		return gt
  1304  	}
  1305  
  1306  	// test, testtls, and testnocgo are run with linkmode="auto", buildmode=""
  1307  	// as part of go test cmd. Here we only have to register the non-default
  1308  	// build modes of these tests.
  1309  
  1310  	// Stub out various buildmode=pie tests  on alpine until 54354 resolved.
  1311  	builderName := os.Getenv("GO_BUILDER_NAME")
  1312  	disablePIE := strings.HasSuffix(builderName, "-alpine")
  1313  
  1314  	if t.internalLink() {
  1315  		cgoTest("internal", "test", "internal", "")
  1316  	}
  1317  
  1318  	os := gohostos
  1319  	p := gohostos + "/" + goarch
  1320  	switch os {
  1321  	case "darwin", "windows":
  1322  		if !t.extLink() {
  1323  			break
  1324  		}
  1325  		// test linkmode=external, but __thread not supported, so skip testtls.
  1326  		cgoTest("external", "test", "external", "")
  1327  
  1328  		gt := cgoTest("external-s", "test", "external", "")
  1329  		gt.ldflags += " -s"
  1330  
  1331  		if t.supportedBuildmode("pie") && !disablePIE {
  1332  			cgoTest("auto-pie", "test", "auto", "pie")
  1333  			if t.internalLink() && t.internalLinkPIE() {
  1334  				cgoTest("internal-pie", "test", "internal", "pie")
  1335  			}
  1336  		}
  1337  
  1338  	case "aix", "android", "dragonfly", "freebsd", "linux", "netbsd", "openbsd":
  1339  		gt := cgoTest("external-g0", "test", "external", "")
  1340  		gt.env = append(gt.env, "CGO_CFLAGS=-g0 -fdiagnostics-color")
  1341  
  1342  		cgoTest("external", "testtls", "external", "")
  1343  		switch {
  1344  		case os == "aix":
  1345  			// no static linking
  1346  		case p == "freebsd/arm":
  1347  			// -fPIC compiled tls code will use __tls_get_addr instead
  1348  			// of __aeabi_read_tp, however, on FreeBSD/ARM, __tls_get_addr
  1349  			// is implemented in rtld-elf, so -fPIC isn't compatible with
  1350  			// static linking on FreeBSD/ARM with clang. (cgo depends on
  1351  			// -fPIC fundamentally.)
  1352  		default:
  1353  			// Check for static linking support
  1354  			var staticCheck rtSkipFunc
  1355  			ccName := compilerEnvLookup("CC", defaultcc, goos, goarch)
  1356  			cc, err := exec.LookPath(ccName)
  1357  			if err != nil {
  1358  				staticCheck.skip = func(*distTest) (string, bool) {
  1359  					return fmt.Sprintf("$CC (%q) not found, skip cgo static linking test.", ccName), true
  1360  				}
  1361  			} else {
  1362  				cmd := t.dirCmd("src/cmd/cgo/internal/test", cc, "-xc", "-o", "/dev/null", "-static", "-")
  1363  				cmd.Stdin = strings.NewReader("int main() {}")
  1364  				cmd.Stdout, cmd.Stderr = nil, nil // Discard output
  1365  				if err := cmd.Run(); err != nil {
  1366  					// Skip these tests
  1367  					staticCheck.skip = func(*distTest) (string, bool) {
  1368  						return "No support for static linking found (lacks libc.a?), skip cgo static linking test.", true
  1369  					}
  1370  				}
  1371  			}
  1372  
  1373  			// Doing a static link with boringcrypto gets
  1374  			// a C linker warning on Linux.
  1375  			// in function `bio_ip_and_port_to_socket_and_addr':
  1376  			// warning: Using 'getaddrinfo' in statically linked applications requires at runtime the shared libraries from the glibc version used for linking
  1377  			if staticCheck.skip == nil && goos == "linux" && strings.Contains(goexperiment, "boringcrypto") {
  1378  				staticCheck.skip = func(*distTest) (string, bool) {
  1379  					return "skipping static linking check on Linux when using boringcrypto to avoid C linker warning about getaddrinfo", true
  1380  				}
  1381  			}
  1382  
  1383  			// Static linking tests
  1384  			if goos != "android" && p != "netbsd/arm" && !t.msan && !t.asan {
  1385  				// TODO(#56629): Why does this fail on netbsd-arm?
  1386  				// TODO(#70080): Why does this fail with msan?
  1387  				// asan doesn't support static linking (this is an explicit build error on the C side).
  1388  				cgoTest("static", "testtls", "external", "static", staticCheck)
  1389  			}
  1390  			cgoTest("external", "testnocgo", "external", "", staticCheck)
  1391  			if goos != "android" && !t.msan && !t.asan {
  1392  				// TODO(#70080): Why does this fail with msan?
  1393  				// asan doesn't support static linking (this is an explicit build error on the C side).
  1394  				cgoTest("static", "testnocgo", "external", "static", staticCheck)
  1395  				cgoTest("static", "test", "external", "static", staticCheck)
  1396  				// -static in CGO_LDFLAGS triggers a different code path
  1397  				// than -static in -extldflags, so test both.
  1398  				// See issue #16651.
  1399  				if goarch != "loong64" && !t.msan && !t.asan {
  1400  					// TODO(#56623): Why does this fail on loong64?
  1401  					cgoTest("auto-static", "test", "auto", "static", staticCheck)
  1402  				}
  1403  			}
  1404  
  1405  			// PIE linking tests
  1406  			if t.supportedBuildmode("pie") && !disablePIE {
  1407  				cgoTest("auto-pie", "test", "auto", "pie")
  1408  				if t.internalLink() && t.internalLinkPIE() {
  1409  					cgoTest("internal-pie", "test", "internal", "pie")
  1410  				}
  1411  				cgoTest("auto-pie", "testtls", "auto", "pie")
  1412  				cgoTest("auto-pie", "testnocgo", "auto", "pie")
  1413  			}
  1414  		}
  1415  	}
  1416  }
  1417  
  1418  // runPending runs pending test commands, in parallel, emitting headers as appropriate.
  1419  // When finished, it emits header for nextTest, which is going to run after the
  1420  // pending commands are done (and runPending returns).
  1421  // A test should call runPending if it wants to make sure that it is not
  1422  // running in parallel with earlier tests, or if it has some other reason
  1423  // for needing the earlier tests to be done.
  1424  func (t *tester) runPending(nextTest *distTest) {
  1425  	worklist := t.worklist
  1426  	t.worklist = nil
  1427  	for _, w := range worklist {
  1428  		w.start = make(chan bool)
  1429  		w.end = make(chan struct{})
  1430  		// w.cmd must be set up to write to w.out. We can't check that, but we
  1431  		// can check for easy mistakes.
  1432  		if w.cmd.Stdout == nil || w.cmd.Stdout == os.Stdout || w.cmd.Stderr == nil || w.cmd.Stderr == os.Stderr {
  1433  			panic("work.cmd.Stdout/Stderr must be redirected")
  1434  		}
  1435  		go func(w *work) {
  1436  			if !<-w.start {
  1437  				timelog("skip", w.dt.name)
  1438  				w.printSkip(t, "skipped due to earlier error")
  1439  			} else {
  1440  				timelog("start", w.dt.name)
  1441  				w.err = w.cmd.Run()
  1442  				if w.flush != nil {
  1443  					w.flush()
  1444  				}
  1445  				if w.err != nil {
  1446  					if isUnsupportedVMASize(w) {
  1447  						timelog("skip", w.dt.name)
  1448  						w.out.Reset()
  1449  						w.printSkip(t, "skipped due to unsupported VMA")
  1450  						w.err = nil
  1451  					}
  1452  				}
  1453  			}
  1454  			timelog("end", w.dt.name)
  1455  			w.end <- struct{}{}
  1456  		}(w)
  1457  	}
  1458  
  1459  	maxbg := maxbg
  1460  	// for runtime.NumCPU() < 4 ||  runtime.GOMAXPROCS(0) == 1, do not change maxbg.
  1461  	// Because there is not enough CPU to parallel the testing of multiple packages.
  1462  	if runtime.NumCPU() > 4 && runtime.GOMAXPROCS(0) != 1 {
  1463  		for _, w := range worklist {
  1464  			// See go.dev/issue/65164
  1465  			// because GOMAXPROCS=2 runtime CPU usage is low,
  1466  			// so increase maxbg to avoid slowing down execution with low CPU usage.
  1467  			// This makes testing a single package slower,
  1468  			// but testing multiple packages together faster.
  1469  			if strings.Contains(w.dt.heading, "GOMAXPROCS=2 runtime") {
  1470  				maxbg = runtime.NumCPU()
  1471  				break
  1472  			}
  1473  		}
  1474  	}
  1475  
  1476  	started := 0
  1477  	ended := 0
  1478  	var last *distTest
  1479  	for ended < len(worklist) {
  1480  		for started < len(worklist) && started-ended < maxbg {
  1481  			w := worklist[started]
  1482  			started++
  1483  			w.start <- !t.failed || t.keepGoing
  1484  		}
  1485  		w := worklist[ended]
  1486  		dt := w.dt
  1487  		if t.lastHeading != dt.heading {
  1488  			t.lastHeading = dt.heading
  1489  			t.out(dt.heading)
  1490  		}
  1491  		if dt != last {
  1492  			// Assumes all the entries for a single dt are in one worklist.
  1493  			last = w.dt
  1494  			if vflag > 0 {
  1495  				fmt.Printf("# go tool dist test -run=^%s$\n", dt.name)
  1496  			}
  1497  		}
  1498  		if vflag > 1 {
  1499  			errprintf("%#q\n", w.cmd)
  1500  		}
  1501  		ended++
  1502  		<-w.end
  1503  		os.Stdout.Write(w.out.Bytes())
  1504  		// We no longer need the output, so drop the buffer.
  1505  		w.out = bytes.Buffer{}
  1506  		if w.err != nil {
  1507  			log.Printf("Failed: %v", w.err)
  1508  			t.failed = true
  1509  		}
  1510  	}
  1511  	if t.failed && !t.keepGoing {
  1512  		fatalf("FAILED")
  1513  	}
  1514  
  1515  	if dt := nextTest; dt != nil {
  1516  		if t.lastHeading != dt.heading {
  1517  			t.lastHeading = dt.heading
  1518  			t.out(dt.heading)
  1519  		}
  1520  		if vflag > 0 {
  1521  			fmt.Printf("# go tool dist test -run=^%s$\n", dt.name)
  1522  		}
  1523  	}
  1524  }
  1525  
  1526  // hasParallelism is a copy of the function
  1527  // internal/testenv.HasParallelism, which can't be used here
  1528  // because cmd/dist can not import internal packages during bootstrap.
  1529  func (t *tester) hasParallelism() bool {
  1530  	switch goos {
  1531  	case "js", "wasip1":
  1532  		return false
  1533  	}
  1534  	return true
  1535  }
  1536  
  1537  func (t *tester) raceDetectorSupported() bool {
  1538  	if gohostos != goos {
  1539  		return false
  1540  	}
  1541  	if !t.cgoEnabled {
  1542  		return false
  1543  	}
  1544  	if !raceDetectorSupported(goos, goarch) {
  1545  		return false
  1546  	}
  1547  	// The race detector doesn't work on Alpine Linux:
  1548  	// golang.org/issue/14481
  1549  	if isAlpineLinux() {
  1550  		return false
  1551  	}
  1552  	// NetBSD support is unfinished.
  1553  	// golang.org/issue/26403
  1554  	if goos == "netbsd" {
  1555  		return false
  1556  	}
  1557  	return true
  1558  }
  1559  
  1560  func isAlpineLinux() bool {
  1561  	if runtime.GOOS != "linux" {
  1562  		return false
  1563  	}
  1564  	fi, err := os.Lstat("/etc/alpine-release")
  1565  	return err == nil && fi.Mode().IsRegular()
  1566  }
  1567  
  1568  func (t *tester) registerRaceTests() {
  1569  	hdr := "Testing race detector"
  1570  	t.registerTest(hdr,
  1571  		&goTest{
  1572  			variant:  "race",
  1573  			race:     true,
  1574  			runTests: "Output",
  1575  			pkg:      "runtime/race",
  1576  		})
  1577  	t.registerTest(hdr,
  1578  		&goTest{
  1579  			variant:  "race",
  1580  			race:     true,
  1581  			runTests: "TestParse|TestEcho|TestStdinCloseRace|TestClosedPipeRace|TestTypeRace|TestFdRace|TestFdReadRace|TestFileCloseRace",
  1582  			pkgs:     []string{"flag", "net", "os", "os/exec", "encoding/gob"},
  1583  		})
  1584  	// We don't want the following line, because it
  1585  	// slows down all.bash (by 10 seconds on my laptop).
  1586  	// The race builder should catch any error here, but doesn't.
  1587  	// TODO(iant): Figure out how to catch this.
  1588  	// t.registerTest(hdr, &goTest{variant: "race", race: true, runTests: "TestParallelTest", pkg: "cmd/go"})
  1589  	if t.cgoEnabled {
  1590  		// Building cmd/cgo/internal/test takes a long time.
  1591  		// There are already cgo-enabled packages being tested with the race detector.
  1592  		// We shouldn't need to redo all of cmd/cgo/internal/test too.
  1593  		// The race builder will take care of this.
  1594  		// t.registerTest(hdr, &goTest{variant: "race", race: true, env: []string{"GOTRACEBACK=2"}, pkg: "cmd/cgo/internal/test"})
  1595  	}
  1596  	if t.extLink() {
  1597  		// Test with external linking; see issue 9133.
  1598  		t.registerTest(hdr,
  1599  			&goTest{
  1600  				variant:  "race-external",
  1601  				race:     true,
  1602  				ldflags:  "-linkmode=external",
  1603  				runTests: "TestParse|TestEcho|TestStdinCloseRace",
  1604  				pkgs:     []string{"flag", "os/exec"},
  1605  			})
  1606  	}
  1607  }
  1608  
  1609  // cgoPackages is the standard packages that use cgo.
  1610  var cgoPackages = []string{
  1611  	"net",
  1612  	"os/user",
  1613  }
  1614  
  1615  var funcBenchmark = []byte("\nfunc Benchmark")
  1616  
  1617  // packageHasBenchmarks reports whether pkg has benchmarks.
  1618  // On any error, it conservatively returns true.
  1619  //
  1620  // This exists just to eliminate work on the builders, since compiling
  1621  // a test in race mode just to discover it has no benchmarks costs a
  1622  // second or two per package, and this function returns false for
  1623  // about 100 packages.
  1624  func (t *tester) packageHasBenchmarks(pkg string) bool {
  1625  	pkgDir := filepath.Join(goroot, "src", pkg)
  1626  	d, err := os.Open(pkgDir)
  1627  	if err != nil {
  1628  		return true // conservatively
  1629  	}
  1630  	defer d.Close()
  1631  	names, err := d.Readdirnames(-1)
  1632  	if err != nil {
  1633  		return true // conservatively
  1634  	}
  1635  	for _, name := range names {
  1636  		if !strings.HasSuffix(name, "_test.go") {
  1637  			continue
  1638  		}
  1639  		slurp, err := os.ReadFile(filepath.Join(pkgDir, name))
  1640  		if err != nil {
  1641  			return true // conservatively
  1642  		}
  1643  		if bytes.Contains(slurp, funcBenchmark) {
  1644  			return true
  1645  		}
  1646  	}
  1647  	return false
  1648  }
  1649  
  1650  // makeGOROOTUnwritable makes all $GOROOT files & directories non-writable to
  1651  // check that no tests accidentally write to $GOROOT.
  1652  func (t *tester) makeGOROOTUnwritable() (undo func()) {
  1653  	dir := os.Getenv("GOROOT")
  1654  	if dir == "" {
  1655  		panic("GOROOT not set")
  1656  	}
  1657  
  1658  	type pathMode struct {
  1659  		path string
  1660  		mode os.FileMode
  1661  	}
  1662  	var dirs []pathMode // in lexical order
  1663  
  1664  	undo = func() {
  1665  		for i := range dirs {
  1666  			os.Chmod(dirs[i].path, dirs[i].mode) // best effort
  1667  		}
  1668  	}
  1669  
  1670  	filepath.WalkDir(dir, func(path string, d fs.DirEntry, err error) error {
  1671  		if suffix := strings.TrimPrefix(path, dir+string(filepath.Separator)); suffix != "" {
  1672  			if suffix == ".git" {
  1673  				// Leave Git metadata in whatever state it was in. It may contain a lot
  1674  				// of files, and it is highly unlikely that a test will try to modify
  1675  				// anything within that directory.
  1676  				return filepath.SkipDir
  1677  			}
  1678  		}
  1679  		if err != nil {
  1680  			return nil
  1681  		}
  1682  
  1683  		info, err := d.Info()
  1684  		if err != nil {
  1685  			return nil
  1686  		}
  1687  
  1688  		mode := info.Mode()
  1689  		if mode&0222 != 0 && (mode.IsDir() || mode.IsRegular()) {
  1690  			dirs = append(dirs, pathMode{path, mode})
  1691  		}
  1692  		return nil
  1693  	})
  1694  
  1695  	// Run over list backward to chmod children before parents.
  1696  	for i := len(dirs) - 1; i >= 0; i-- {
  1697  		err := os.Chmod(dirs[i].path, dirs[i].mode&^0222)
  1698  		if err != nil {
  1699  			dirs = dirs[i:] // Only undo what we did so far.
  1700  			undo()
  1701  			fatalf("failed to make GOROOT read-only: %v", err)
  1702  		}
  1703  	}
  1704  
  1705  	return undo
  1706  }
  1707  
  1708  // raceDetectorSupported is a copy of the function
  1709  // internal/platform.RaceDetectorSupported, which can't be used here
  1710  // because cmd/dist can not import internal packages during bootstrap.
  1711  // The race detector only supports 48-bit VMA on arm64. But we don't have
  1712  // a good solution to check VMA size (see https://go.dev/issue/29948).
  1713  // raceDetectorSupported will always return true for arm64. But race
  1714  // detector tests may abort on non 48-bit VMA configuration, the tests
  1715  // will be marked as "skipped" in this case.
  1716  func raceDetectorSupported(goos, goarch string) bool {
  1717  	switch goos {
  1718  	case "linux":
  1719  		return goarch == "amd64" || goarch == "arm64" || goarch == "loong64" || goarch == "ppc64le" || goarch == "riscv64" || goarch == "s390x"
  1720  	case "darwin":
  1721  		return goarch == "amd64" || goarch == "arm64"
  1722  	case "freebsd", "netbsd", "windows":
  1723  		return goarch == "amd64"
  1724  	default:
  1725  		return false
  1726  	}
  1727  }
  1728  
  1729  // buildModeSupported is a copy of the function
  1730  // internal/platform.BuildModeSupported, which can't be used here
  1731  // because cmd/dist can not import internal packages during bootstrap.
  1732  func buildModeSupported(compiler, buildmode, goos, goarch string) bool {
  1733  	if compiler == "gccgo" {
  1734  		return true
  1735  	}
  1736  
  1737  	platform := goos + "/" + goarch
  1738  
  1739  	switch buildmode {
  1740  	case "archive":
  1741  		return true
  1742  
  1743  	case "c-archive":
  1744  		switch goos {
  1745  		case "aix", "darwin", "ios", "windows":
  1746  			return true
  1747  		case "linux":
  1748  			switch goarch {
  1749  			case "386", "amd64", "arm", "armbe", "arm64", "arm64be", "loong64", "ppc64", "ppc64le", "riscv64", "s390x":
  1750  				return true
  1751  			default:
  1752  				// Other targets do not support -shared,
  1753  				// per ParseFlags in
  1754  				// cmd/compile/internal/base/flag.go.
  1755  				// For c-archive the Go tool passes -shared,
  1756  				// so that the result is suitable for inclusion
  1757  				// in a PIE or shared library.
  1758  				return false
  1759  			}
  1760  		case "freebsd":
  1761  			return goarch == "amd64"
  1762  		}
  1763  		return false
  1764  
  1765  	case "c-shared":
  1766  		switch platform {
  1767  		case "linux/amd64", "linux/arm", "linux/arm64", "linux/loong64", "linux/386", "linux/ppc64", "linux/ppc64le", "linux/riscv64", "linux/s390x",
  1768  			"android/amd64", "android/arm", "android/arm64", "android/386",
  1769  			"freebsd/amd64",
  1770  			"darwin/amd64", "darwin/arm64",
  1771  			"windows/amd64", "windows/386", "windows/arm64",
  1772  			"wasip1/wasm":
  1773  			return true
  1774  		}
  1775  		return false
  1776  
  1777  	case "default":
  1778  		return true
  1779  
  1780  	case "exe":
  1781  		return true
  1782  
  1783  	case "pie":
  1784  		switch platform {
  1785  		case "linux/386", "linux/amd64", "linux/arm", "linux/arm64", "linux/loong64", "linux/ppc64", "linux/ppc64le", "linux/riscv64", "linux/s390x",
  1786  			"android/amd64", "android/arm", "android/arm64", "android/386",
  1787  			"freebsd/amd64",
  1788  			"darwin/amd64", "darwin/arm64",
  1789  			"ios/amd64", "ios/arm64",
  1790  			"aix/ppc64",
  1791  			"openbsd/arm64",
  1792  			"windows/386", "windows/amd64", "windows/arm64":
  1793  			return true
  1794  		}
  1795  		return false
  1796  
  1797  	case "shared":
  1798  		switch platform {
  1799  		case "linux/386", "linux/amd64", "linux/arm", "linux/arm64", "linux/ppc64", "linux/ppc64le", "linux/s390x":
  1800  			return true
  1801  		}
  1802  		return false
  1803  
  1804  	case "plugin":
  1805  		switch platform {
  1806  		case "linux/amd64", "linux/arm", "linux/arm64", "linux/386", "linux/loong64", "linux/riscv64", "linux/s390x", "linux/ppc64", "linux/ppc64le",
  1807  			"android/amd64", "android/386",
  1808  			"darwin/amd64", "darwin/arm64",
  1809  			"freebsd/amd64":
  1810  			return true
  1811  		}
  1812  		return false
  1813  
  1814  	default:
  1815  		return false
  1816  	}
  1817  }
  1818  
  1819  // isUnsupportedVMASize reports whether the failure is caused by an unsupported
  1820  // VMA for the race detector (for example, running the race detector on an
  1821  // arm64 machine configured with 39-bit VMA).
  1822  func isUnsupportedVMASize(w *work) bool {
  1823  	unsupportedVMA := []byte("unsupported VMA range")
  1824  	return strings.Contains(w.dt.name, ":race") && bytes.Contains(w.out.Bytes(), unsupportedVMA)
  1825  }
  1826  
  1827  // isEnvSet reports whether the environment variable evar is
  1828  // set in the environment.
  1829  func isEnvSet(evar string) bool {
  1830  	evarEq := evar + "="
  1831  	for _, e := range os.Environ() {
  1832  		if strings.HasPrefix(e, evarEq) {
  1833  			return true
  1834  		}
  1835  	}
  1836  	return false
  1837  }
  1838  
  1839  func (t *tester) fipsSupported() bool {
  1840  	// Keep this in sync with [crypto/internal/fips140.Supported].
  1841  
  1842  	// We don't test with the purego tag, so no need to check it.
  1843  
  1844  	// Use GOFIPS140 or GOEXPERIMENT=boringcrypto, but not both.
  1845  	if strings.Contains(goexperiment, "boringcrypto") {
  1846  		return false
  1847  	}
  1848  
  1849  	// If this goos/goarch does not support FIPS at all, return no versions.
  1850  	// The logic here matches crypto/internal/fips140/check.Supported for now.
  1851  	// In the future, if some snapshots add support for these, we will have
  1852  	// to make a decision on a per-version basis.
  1853  	switch {
  1854  	case goarch == "wasm",
  1855  		goos == "windows" && goarch == "386",
  1856  		goos == "openbsd",
  1857  		goos == "aix":
  1858  		return false
  1859  	}
  1860  
  1861  	// For now, FIPS+ASAN doesn't need to work.
  1862  	// If this is made to work, also re-enable the test in check_test.go.
  1863  	if t.asan {
  1864  		return false
  1865  	}
  1866  
  1867  	return true
  1868  }
  1869  
  1870  // fipsVersions returns the list of versions available in lib/fips140.
  1871  func fipsVersions() []string {
  1872  	var versions []string
  1873  	zips, err := filepath.Glob(filepath.Join(goroot, "lib/fips140/*.zip"))
  1874  	if err != nil {
  1875  		fatalf("%v", err)
  1876  	}
  1877  	for _, zip := range zips {
  1878  		versions = append(versions, strings.TrimSuffix(filepath.Base(zip), ".zip"))
  1879  	}
  1880  	txts, err := filepath.Glob(filepath.Join(goroot, "lib/fips140/*.txt"))
  1881  	if err != nil {
  1882  		fatalf("%v", err)
  1883  	}
  1884  	for _, txt := range txts {
  1885  		versions = append(versions, strings.TrimSuffix(filepath.Base(txt), ".txt"))
  1886  	}
  1887  	return versions
  1888  }
  1889  
  1890  // goexperiments returns the GOEXPERIMENT value to use
  1891  // when running a test with the given experiments enabled.
  1892  //
  1893  // It preserves any existing GOEXPERIMENTs.
  1894  func goexperiments(exps ...string) string {
  1895  	if len(exps) == 0 {
  1896  		return goexperiment
  1897  	}
  1898  	existing := goexperiment
  1899  	if existing != "" {
  1900  		existing += ","
  1901  	}
  1902  	return existing + strings.Join(exps, ",")
  1903  
  1904  }
  1905  

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