private static final Map<String, URLStreamHandler> PROTOCOL_HANDLERS = new HashMap<>();

    private static final String HANDLER_PKGS_PROPERTY = "java.protocol.handler.pkgs";

    /**
     * Vendor-specific default packages. If no packages are specified in
     * "java.protocol.handler.pkgs", the VM uses one or more default
     * packages, which are vendor specific. Sun's is included below

// As a side effect, buildStacks also constructs ld.pkgs,
// the list of all packages loaded.
func (ld *loader) buildStacks() {
	if len(ld.pkgs) > 0 {
		panic("buildStacks")
	}
	for _, pkg := range ld.roots {
		pkg.stack = pkg // sentinel to avoid processing in next loop
		ld.pkgs = append(ld.pkgs, pkg)
	}
	for i := 0; i < len(ld.pkgs); i++ { // not range: appending to ld.pkgs in loop
		pkg := ld.pkgs[i]

			return name == pkgname
		}
		return false
	}

	// get package AST
	pkgs, err := parser.ParseDir(token.NewFileSet(), dirpath, filter, parser.ParseComments)
	if err != nil {
		println("parse", dirpath, err.Error())
		panic("go ParseDir fail: " + err.Error())
	}
	return pkgs
}

func stressParseGo() {
	pkgroot := runtime.GOROOT() + "/src/"
	for {

		"compress/flate.byLiteral.Less": true,
		"compress/flate.byLiteral.Swap": true,
	}

	notInlinedReason := make(map[string]string)
	pkgs := make([]string, 0, len(want))
	for pname, fnames := range want {
		pkgs = append(pkgs, pname)
		for _, fname := range fnames {
			fullName := pname + "." + fname
			if _, ok := notInlinedReason[fullName]; ok {
				t.Errorf("duplicate func: %s", fullName)

	if d.cmd == debugDumpMode {
		fmt.Printf("totalStmts: %d coveredStmts: %d\n", d.totalStmts, d.coveredStmts)
	}
	if d.cmd == pkglistMode {
		pkgs := make([]string, 0, len(d.pkgpaths))
		for p := range d.pkgpaths {
			pkgs = append(pkgs, p)
		}
		sort.Strings(pkgs)
		for _, p := range pkgs {
			fmt.Printf("%s\n", p)
		}
	}

		case isExplicit[m]:
			io.WriteString(w, "## explicit\n")
		case goVersion != "":
			fmt.Fprintf(w, "## go %s\n", goVersion)
		}

		pkgs := modpkgs[m]
		sort.Strings(pkgs)
		for _, pkg := range pkgs {
			fmt.Fprintf(w, "%s\n", pkg)
			vendorPkg(vdir, pkg)
		}
	}

	if includeAllReplacements {
		// Record unused and wildcard replacements at the end of the modules.txt file:

		SilenceUnmatchedWarnings: true,
	}
	for _, m := range mms.Versions() {
		opts.MainModule = m
		_, pkgs := modload.LoadPackages(ctx, opts, "all")
		opts.MainModule = module.Version{} // reset

		var (
			mustSelect   []module.Version
			inMustSelect = map[module.Version]bool{}
		)
		for _, pkg := range pkgs {
			if r := modload.PackageModule(pkg); r.Version != "" && !inMustSelect[r] {

// That is, the input a1 represents "go build pkgs" and the result represents "go build -buildmode=shared pkgs".
func (b *Builder) buildmodeShared(mode, depMode BuildMode, args []string, pkgs []*load.Package, a1 *Action) *Action {
	name, err := libname(args, pkgs)
	if err != nil {
		base.Fatalf("%v", err)
	}
	return b.linkSharedAction(mode, depMode, name, a1)
}

				p.Internal.CmdlinePkgLiteral = true
			}
			pkgs = append(pkgs, p)
		}
	}

	if opts.MainOnly {
		pkgs = mainPackagesOnly(pkgs, matches)
	}

	// Now that CmdlinePkg is set correctly,
	// compute the effective flags for all loaded packages
	// (not just the ones matching the patterns but also
	// their dependencies).
	setToolFlags(pkgs...)

	setPGOProfilePath(pkgs)

	return pkgs

		pkgs := goDirPackages(t.T, longdir, singlefilepkgs)
		errPkg := len(pkgs) - 1
		if wantError && action == "errorcheckandrundir" {
			// The last pkg should compiled successfully and will be run in next case.
			// Preceding pkg must return an error from compileInDir.
			errPkg--
		}
		importcfgfile := importcfg(pkgs)
		for i, pkg := range pkgs {