func TestTransitivelyErrorFreeFlag(t *testing.T) {
// 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"`,
}
conf := loader.Config{
AllowErrors: true,
SourceImports: true,
Build: fakeContext(pkgs),
}
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)
}
}
}
// Test that both syntax (scan/parse) and type errors are both recorded
// (in PackageInfo.Errors) and reported (via Config.TypeChecker.Error).
func TestErrorReporting(t *testing.T) {
pkgs := map[string]string{
"a": `package a; import _ "b"; var x int = false`,
"b": `package b; 'syntax error!`,
}
conf := loader.Config{
AllowErrors: true,
SourceImports: true,
Build: fakeContext(pkgs),
}
var mu sync.Mutex
var allErrors []error
conf.TypeChecker.Error = func(err error) {
mu.Lock()
allErrors = append(allErrors, err)
mu.Unlock()
}
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")
}
// TODO(adonovan): test keys of ImportMap.
// Check errors recorded in each PackageInfo.
for pkg, info := range prog.AllPackages {
switch pkg.Path() {
case "a":
if !hasError(info.Errors, "cannot convert false") {
t.Errorf("a.Errors = %v, want bool conversion (type) error", info.Errors)
}
case "b":
if !hasError(info.Errors, "rune literal not terminated") {
t.Errorf("b.Errors = %v, want unterminated literal (syntax) error", info.Errors)
}
}
}
// Check errors reported via error handler.
if !hasError(allErrors, "cannot convert false") ||
!hasError(allErrors, "rune literal not terminated") {
t.Errorf("allErrors = %v, want both syntax and type errors", allErrors)
}
}
func generateSourceFiles(conf *loader.Config, subcommand string) (tmpDirPath string) {
// Make a temp directory.
tmpDir := makeTmpDir()
if *work {
// Print the name of the directory and don't clean it up on exit.
fmt.Println(tmpDir)
} else {
// Clean up the directory on exit.
atexit.Run(func() {
removeDir(tmpDir)
})
}
// Load the whole program from source files. This almost certainly causes more work than we need to do,
// but it's an easy fix for a few problems I've encountered. Deleting this may be a good target for
// future optimization work.
conf.SourceImports = true
// Mark the extra packages we want to instrument.
var pkgs []string
*instrument = strings.Trim(*instrument, ", ")
if *instrument != "" {
pkgs = strings.Split(*instrument, ",")
}
all := false
for _, pkg := range pkgs {
// check for the special reserved package names: "main", "all", and "std"
// see 'go help packages'
switch pkg {
case "main":
switch subcommand {
case "run": // The main package is always instrumented anyway. Carry on.
case "test":
logFatal(`godebug test: can't pass reserved name "main" in the -instrument flag.`)
}
case "all":
if !all {
all = true
fmt.Println(`godebug run: heads up: "all" means "all except std". godebug can't step into the standard library yet.` + "\n")
}
case "std":
logFatalf("godebug %s: reserved name \"std\" cannot be passed in the -instrument flag."+
"\ngodebug cannot currently instrument packages in the standard library."+
"\nDo you wish it could? Chime in at https://github.com/mailgun/godebug/issues/12",
subcommand)
default:
for _, path := range gotool.ImportPaths([]string{pkg}) { // wildcard "..." expansion
conf.Import(path)
}
}
}
// Load the program.
prog, err := conf.Load()
exitIfErr(err)
// If we're in "all" mode, mark all but the standard library packages and godebug itself for instrumenting.
stdLib := getStdLibPkgs()
if all {
markAlmostAllPackages(prog, stdLib)
}
// Warn the user if they have breakpoints set in files that we are not instrumenting.
checkForUnusedBreakpoints(subcommand, prog, stdLib)
// Generate debugging-enabled source files.
wd := getwd()
gen.Generate(prog, ioutil.ReadFile, func(importPath, filename string) io.WriteCloser {
if importPath == "main" {
filename = filepath.Join(tmpDir, filepath.Base(filename))
} else {
importPath, _ = findUnderGopath(wd, importPath)
exitIfErr(os.MkdirAll(filepath.Join(tmpDir, "src", importPath), 0770))
filename = filepath.Join(tmpDir, "src", importPath, filepath.Base(filename))
}
return createFileHook(filename, tmpDir)
})
return tmpDir
}
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)
}
}
}
}