func TestTransitivelyErrorFreeFlag(t *testing.T) {
conf := loader.Config{
AllowErrors: true,
SourceImports: true,
}
// Create an minimal custom build.Context
// that fakes the following packages:
//
// a --> b --> c! c has an error
// \ d and e are transitively error-free.
// e --> d
//
// Each package [a-e] consists of one file, x.go.
pkgs := map[string]string{
"a": `package a; import (_ "b"; _ "e")`,
"b": `package b; import _ "c"`,
"c": `package c; func f() { _ = int(false) }`, // type error within function body
"d": `package d;`,
"e": `package e; import _ "d"`,
}
ctxt := build.Default // copy
ctxt.GOROOT = "/go"
ctxt.GOPATH = ""
ctxt.IsDir = func(path string) bool { return true }
ctxt.ReadDir = func(dir string) ([]os.FileInfo, error) { return justXgo[:], nil }
ctxt.OpenFile = func(path string) (io.ReadCloser, error) {
path = path[len("/go/src/pkg/"):]
return nopCloser{bytes.NewBufferString(pkgs[path[0:1]])}, nil
}
conf.Build = &ctxt
conf.Import("a")
prog, err := conf.Load()
if err != nil {
t.Errorf("Load failed: %s", err)
}
if prog == nil {
t.Fatalf("Load returned nil *Program")
}
for pkg, info := range prog.AllPackages {
var wantErr, wantTEF bool
switch pkg.Path() {
case "a", "b":
case "c":
wantErr = true
case "d", "e":
wantTEF = true
default:
t.Errorf("unexpected package: %q", pkg.Path())
continue
}
if (info.Errors != nil) != wantErr {
if wantErr {
t.Errorf("Package %q.Error = nil, want error", pkg.Path())
} else {
t.Errorf("Package %q has unexpected Errors: %v",
pkg.Path(), info.Errors)
}
}
if info.TransitivelyErrorFree != wantTEF {
t.Errorf("Package %q.TransitivelyErrorFree=%t, want %t",
pkg.Path(), info.TransitivelyErrorFree, wantTEF)
}
}
}
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
}
// 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)
}
}
}
}
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)
}
conf := loader.Config{SourceImports: true}
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 code.google.com/p/go.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() {
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 code.google.com/p/go.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
}