예제 #1
0
func TestCgoOption(t *testing.T) {
	switch runtime.GOOS {
	// On these systems, the net and os/user packages don't use cgo.
	case "plan9", "solaris", "windows":
		return
	}
	// In nocgo builds (e.g. linux-amd64-nocgo),
	// there is no "runtime/cgo" package,
	// so cgo-generated Go files will have a failing import.
	if !build.Default.CgoEnabled {
		return
	}
	// Test that we can load cgo-using packages with
	// CGO_ENABLED=[01], which causes go/build to select pure
	// Go/native implementations, respectively, based on build
	// tags.
	//
	// Each entry specifies a package-level object and the generic
	// file expected to define it when cgo is disabled.
	// When cgo is enabled, the exact file is not specified (since
	// it varies by platform), but must differ from the generic one.
	//
	// The test also loads the actual file to verify that the
	// object is indeed defined at that location.
	for _, test := range []struct {
		pkg, name, genericFile string
	}{
		{"net", "cgoLookupHost", "cgo_stub.go"},
		{"os/user", "lookupId", "lookup_stubs.go"},
	} {
		ctxt := build.Default
		for _, ctxt.CgoEnabled = range []bool{false, true} {
			conf := loader.Config{Build: &ctxt}
			conf.Import(test.pkg)
			prog, err := conf.Load()
			if err != nil {
				t.Errorf("Load failed: %v", err)
				continue
			}
			info := prog.Imported[test.pkg]
			if info == nil {
				t.Errorf("package %s not found", test.pkg)
				continue
			}
			obj := info.Pkg.Scope().Lookup(test.name)
			if obj == nil {
				t.Errorf("no object %s.%s", test.pkg, test.name)
				continue
			}
			posn := prog.Fset.Position(obj.Pos())
			t.Logf("%s: %s (CgoEnabled=%t)", posn, obj, ctxt.CgoEnabled)

			gotFile := filepath.Base(posn.Filename)
			filesMatch := gotFile == test.genericFile

			if ctxt.CgoEnabled && filesMatch {
				t.Errorf("CGO_ENABLED=1: %s found in %s, want native file",
					obj, gotFile)
			} else if !ctxt.CgoEnabled && !filesMatch {
				t.Errorf("CGO_ENABLED=0: %s found in %s, want %s",
					obj, gotFile, test.genericFile)
			}

			// Load the file and check the object is declared at the right place.
			b, err := ioutil.ReadFile(posn.Filename)
			if err != nil {
				t.Errorf("can't read %s: %s", posn.Filename, err)
				continue
			}
			line := string(bytes.Split(b, []byte("\n"))[posn.Line-1])
			ident := line[posn.Column-1:]
			if !strings.HasPrefix(ident, test.name) {
				t.Errorf("%s: %s not declared here (looking at %q)", posn, obj, ident)
			}
		}
	}
}
예제 #2
0
func run(t *testing.T, dir, input string, success successPredicate) bool {
	fmt.Printf("Input: %s\n", input)

	start := time.Now()

	var inputs []string
	for _, i := range strings.Split(input, " ") {
		if strings.HasSuffix(i, ".go") {
			i = dir + i
		}
		inputs = append(inputs, i)
	}

	var conf loader.Config
	if _, err := conf.FromArgs(inputs, true); err != nil {
		t.Errorf("FromArgs(%s) failed: %s", inputs, err)
		return false
	}

	conf.Import("runtime")

	// Print a helpful hint if we don't make it to the end.
	var hint string
	defer func() {
		if hint != "" {
			fmt.Println("FAIL")
			fmt.Println(hint)
		} else {
			fmt.Println("PASS")
		}

		interp.CapturedOutput = nil
	}()

	hint = fmt.Sprintf("To dump SSA representation, run:\n%% go build golang.org/x/tools/cmd/ssadump && ./ssadump -build=CFP %s\n", input)

	iprog, err := conf.Load()
	if err != nil {
		t.Errorf("conf.Load(%s) failed: %s", inputs, err)
		return false
	}

	prog := ssa.Create(iprog, ssa.SanityCheckFunctions)
	prog.BuildAll()

	var mainPkg *ssa.Package
	var initialPkgs []*ssa.Package
	for _, info := range iprog.InitialPackages() {
		if info.Pkg.Path() == "runtime" {
			continue // not an initial package
		}
		p := prog.Package(info.Pkg)
		initialPkgs = append(initialPkgs, p)
		if mainPkg == nil && p.Func("main") != nil {
			mainPkg = p
		}
	}
	if mainPkg == nil {
		testmainPkg := prog.CreateTestMainPackage(initialPkgs...)
		if testmainPkg == nil {
			t.Errorf("CreateTestMainPackage(%s) returned nil", mainPkg)
			return false
		}
		if testmainPkg.Func("main") == nil {
			t.Errorf("synthetic testmain package has no main")
			return false
		}
		mainPkg = testmainPkg
	}

	var out bytes.Buffer
	interp.CapturedOutput = &out

	hint = fmt.Sprintf("To trace execution, run:\n%% go build golang.org/x/tools/cmd/ssadump && ./ssadump -build=C -run --interp=T %s\n", input)
	exitCode := interp.Interpret(mainPkg, 0, &types.StdSizes{8, 8}, inputs[0], []string{})

	// The definition of success varies with each file.
	if err := success(exitCode, out.String()); err != nil {
		t.Errorf("interp.Interpret(%s) failed: %s", inputs, err)
		return false
	}

	hint = "" // call off the hounds

	if false {
		fmt.Println(input, time.Since(start)) // test profiling
	}

	return true
}