if coverMerge.f == nil {
		return
	}
	coverMerge.Lock()
	defer coverMerge.Unlock()

	expect := fmt.Sprintf("mode: %s\n", cfg.BuildCoverMode)
	buf := make([]byte, len(expect))
	r, err := os.Open(file)
	if err != nil {
		// Test did not create profile, which is OK.
		return
	}
	defer r.Close()

	n, err := io.ReadFull(r, buf)
	if n == 0 {
		return
	}
	if err != nil || string(buf) != expect {

// in a network file system). File locking is notoriously unreliable in
// network file systems and may not suffice to protect the cache.
func Open(dir string) (*DiskCache, error) {
	info, err := os.Stat(dir)
	if err != nil {
		return nil, err
	}
	if !info.IsDir() {
		return nil, &fs.PathError{Op: "open", Path: dir, Err: fmt.Errorf("not a directory")}
	}
	for i := 0; i < 256; i++ {
		name := filepath.Join(dir, fmt.Sprintf("%02x", i))

			t.Fatalf("error copying %s : %v", file, err)
		}
	}

	// Add some comments to the top of inline_hot.go. This adjusts the line
	// numbers of all of the functions without changing the semantics.
	src, err := os.Open(filepath.Join(srcDir, "inline_hot.go"))
	if err != nil {
		t.Fatalf("error opening src inline_hot.go: %v", err)
	}
	defer src.Close()

	dst, err := os.Create(filepath.Join(dir, "inline_hot.go"))
	if err != nil {

	out, err := exec.Command("go", argv...).CombinedOutput()
	if err != nil {
		t.Fatalf("build failure: %s\n%s\n", err, string(out))
	}

	f, err := pe.Open(objfile)
	if err != nil {
		t.Fatalf("pe.Open failed: %v", err)
	}
	defer f.Close()
	section := f.Section(".edata")
	if section == nil {
		t.Skip(".edata section is not present")
	}

	}
	if _, err := os.Stat(filepath.Join(dir, "README")); err != nil {
		// Best effort.
		os.WriteFile(filepath.Join(dir, "README"), []byte(cacheREADME), 0666)
	}

	diskCache, err := Open(dir)
	if err != nil {
		base.Fatalf("failed to initialize build cache at %s: %s\n", dir, err)
	}

	if v := cfg.Getenv("GOCACHEPROG"); v != "" && goexperiment.CacheProg {
		defaultCache = startCacheProg(v, diskCache)

		return a.Type().Alignment() > b.Type().Alignment()
	}

	// Sort normal variables before open-coded-defer slots, so that the
	// latter are grouped together and near the top of the frame (to
	// minimize varint encoding of their varp offset).
	if a.OpenDeferSlot() != b.OpenDeferSlot() {
		return a.OpenDeferSlot()
	}

	// If a and b are both open-coded defer slots, then order them by

//   int8_t DidInitRun() // returns true
//   int8_t DidMainRun() // returns true
//   int32_t FromPkg() // returns 1024
int main(int argc, char** argv) {
  void* handle = dlopen(argv[1], RTLD_LAZY | RTLD_GLOBAL);
  if (!handle) {
    fprintf(stderr, "ERROR: failed to open the shared library: %s\n",
		    dlerror());
    return 2;
  }

  int ret = 0;
  ret = check_int8(handle, "DidInitRun", 1);
  if (ret != 0) {
    return ret;

	"cmd/compile/internal/typecheck"
	"cmd/compile/internal/types"
	"cmd/internal/objabi"
)

func LoadPackage(filenames []string) {
	base.Timer.Start("fe", "parse")

	// Limit the number of simultaneously open files.
	sem := make(chan struct{}, runtime.GOMAXPROCS(0)+10)

	noders := make([]*noder, len(filenames))
	for i := range noders {
		p := noder{
			err: make(chan syntax.Error),
		}
		noders[i] = &p
	}

		pred := runAct.Deps[i]
		if pred.Mode != "build" || pred.Package == nil {
			continue
		}
		if pred.Package.ImportPath == p.ImportPath {
			metaFile := pred.Objdir + covcmd.MetaFileForPackage(p.ImportPath)
			f, err := os.Open(metaFile)
			if err != nil {
				return "", err
			}
			defer f.Close()
			fi, err2 := f.Stat()
			if err2 != nil {
				return "", err2
			}
			if fi.Size() == 0 {
				return "", nil
			}

// .go_export section.
func readpkglist(shlibpath string) (pkgs []*load.Package) {
	var stk load.ImportStack
	if cfg.BuildToolchainName == "gccgo" {
		f, err := elf.Open(shlibpath)
		if err != nil {
			base.Fatal(fmt.Errorf("failed to open shared library: %v", err))
		}
		defer f.Close()
		sect := f.Section(".go_export")
		if sect == nil {
			base.Fatal(fmt.Errorf("%s: missing .go_export section", shlibpath))
		}