1 // Copyright 2011 The Go Authors. All rights reserved.
2 // Use of this source code is governed by a BSD-style
3 // license that can be found in the LICENSE file.
5 // This file implements a typechecker test harness. The packages specified
6 // in tests are typechecked. Error messages reported by the typechecker are
7 // compared against the errors expected in the test files.
9 // Expected errors are indicated in the test files by putting comments
10 // of the form /* ERROR pattern */ or /* ERRORx pattern */ (or a similar
11 // //-style line comment) immediately following the tokens where errors
12 // are reported. There must be exactly one blank before and after the
13 // ERROR/ERRORx indicator, and the pattern must be a properly quoted Go
16 // The harness will verify that each ERROR pattern is a substring of the
17 // error reported at that source position, and that each ERRORx pattern
18 // is a regular expression matching the respective error.
19 // Consecutive comments may be used to indicate multiple errors reported
20 // at the same position.
22 // For instance, the following test source indicates that an "undeclared"
23 // error should be reported for the undeclared variable x:
27 // _ = x /* ERROR "undeclared" */ + 1
43 "internal/types/errors"
57 haltOnError = flag.Bool("halt", false, "halt on error")
58 verifyErrors = flag.Bool("verify", false, "verify errors (rather than list them) in TestManual")
59 enableAlias = flag.Bool("alias", false, "set Config._EnableAlias for tests")
62 var fset = token.NewFileSet()
64 func parseFiles(t *testing.T, filenames []string, srcs [][]byte, mode parser.Mode) ([]*ast.File, []error) {
67 for i, filename := range filenames {
68 file, err := parser.ParseFile(fset, filename, srcs[i], mode)
70 t.Fatalf("%s: %s", filename, err)
72 files = append(files, file)
74 if list, _ := err.(scanner.ErrorList); len(list) > 0 {
75 for _, err := range list {
76 errlist = append(errlist, err)
79 errlist = append(errlist, err)
86 func unpackError(fset *token.FileSet, err error) (token.Position, string) {
87 switch err := err.(type) {
89 return err.Pos, err.Msg
91 return fset.Position(err.Pos), err.Msg
96 // absDiff returns the absolute difference between x and y.
97 func absDiff(x, y int) int {
104 // parseFlags parses flags from the first line of the given source if the line
105 // starts with "//" (line comment) followed by "-" (possibly with spaces
106 // between). Otherwise the line is ignored.
107 func parseFlags(src []byte, flags *flag.FlagSet) error {
108 // we must have a line comment that starts with a "-"
110 if !bytes.HasPrefix(src, []byte(prefix)) {
111 return nil // first line is not a line comment
113 src = src[len(prefix):]
114 if i := bytes.Index(src, []byte("-")); i < 0 || len(bytes.TrimSpace(src[:i])) != 0 {
115 return nil // comment doesn't start with a "-"
117 end := bytes.Index(src, []byte("\n"))
119 if end < 0 || end > maxLen {
120 return fmt.Errorf("flags comment line too long")
123 return flags.Parse(strings.Fields(string(src[:end])))
126 // testFiles type-checks the package consisting of the given files, and
127 // compares the resulting errors with the ERROR annotations in the source.
129 // The srcs slice contains the file content for the files named in the
130 // filenames slice. The manual parameter specifies whether this is a 'manual'
133 // If provided, opts may be used to mutate the Config before type-checking.
134 func testFiles(t *testing.T, filenames []string, srcs [][]byte, manual bool, opts ...func(*Config)) {
135 if len(filenames) == 0 {
136 t.Fatal("no source files")
140 var goexperiment string
141 flags := flag.NewFlagSet("", flag.PanicOnError)
142 flags.StringVar(&conf.GoVersion, "lang", "", "")
143 flags.StringVar(&goexperiment, "goexperiment", "", "")
144 flags.BoolVar(&conf.FakeImportC, "fakeImportC", false, "")
145 flags.BoolVar(boolFieldAddr(&conf, "_EnableAlias"), "alias", *enableAlias, "")
146 if err := parseFlags(srcs[0], flags); err != nil {
149 exp, err := buildcfg.ParseGOEXPERIMENT(runtime.GOOS, runtime.GOARCH, goexperiment)
153 old := buildcfg.Experiment
155 buildcfg.Experiment = old
157 buildcfg.Experiment = *exp
159 files, errlist := parseFiles(t, filenames, srcs, parser.AllErrors)
161 pkgName := "<no package>"
163 pkgName = files[0].Name.Name
166 listErrors := manual && !*verifyErrors
167 if listErrors && len(errlist) > 0 {
168 t.Errorf("--- %s:", pkgName)
169 for _, err := range errlist {
174 // typecheck and collect typechecker errors
175 *boolFieldAddr(&conf, "_Trace") = manual && testing.Verbose()
176 conf.Importer = importer.Default()
177 conf.Error = func(err error) {
185 // Ignore secondary error messages starting with "\t";
186 // they are clarifying messages for a primary error.
187 if !strings.Contains(err.Error(), ": \t") {
188 errlist = append(errlist, err)
192 for _, opt := range opts {
196 // Provide Config.Info with all maps so that info recording is tested.
198 Types: make(map[ast.Expr]TypeAndValue),
199 Instances: make(map[*ast.Ident]Instance),
200 Defs: make(map[*ast.Ident]Object),
201 Uses: make(map[*ast.Ident]Object),
202 Implicits: make(map[ast.Node]Object),
203 Selections: make(map[*ast.SelectorExpr]*Selection),
204 Scopes: make(map[ast.Node]*Scope),
206 conf.Check(pkgName, fset, files, &info)
212 // collect expected errors
213 errmap := make(map[string]map[int][]comment)
214 for i, filename := range filenames {
215 if m := commentMap(srcs[i], regexp.MustCompile("^ ERRORx? ")); len(m) > 0 {
220 // match against found errors
221 var indices []int // list indices of matching errors, reused for each error
222 for _, err := range errlist {
223 gotPos, gotMsg := unpackError(fset, err)
225 // find list of errors for the respective error line
226 filename := gotPos.Filename
227 filemap := errmap[filename]
229 var errList []comment
231 errList = filemap[line]
234 // At least one of the errors in errList should match the current error.
235 indices = indices[:0]
236 for i, want := range errList {
237 pattern, substr := strings.CutPrefix(want.text, " ERROR ")
240 pattern, found = strings.CutPrefix(want.text, " ERRORx ")
245 pattern, err := strconv.Unquote(strings.TrimSpace(pattern))
247 t.Errorf("%s:%d:%d: %v", filename, line, want.col, err)
251 if !strings.Contains(gotMsg, pattern) {
255 rx, err := regexp.Compile(pattern)
257 t.Errorf("%s:%d:%d: %v", filename, line, want.col, err)
260 if !rx.MatchString(gotMsg) {
264 indices = append(indices, i)
266 if len(indices) == 0 {
267 t.Errorf("%s: no error expected: %q", gotPos, gotMsg)
272 // If there are multiple matching errors, select the one with the closest column position.
273 index := -1 // index of matching error
275 for _, i := range indices {
276 if d := absDiff(gotPos.Column, errList[i].col); index < 0 || d < delta {
281 // The closest column position must be within expected colDelta.
282 const colDelta = 0 // go/types errors are positioned correctly
283 if delta > colDelta {
284 t.Errorf("%s: got col = %d; want %d", gotPos, gotPos.Column, errList[index].col)
287 // eliminate from errList
288 if n := len(errList) - 1; n > 0 {
289 // not the last entry - slide entries down (don't reorder)
290 copy(errList[index:], errList[index+1:])
291 filemap[line] = errList[:n]
293 // last entry - remove errList from filemap
294 delete(filemap, line)
297 // if filemap is empty, eliminate from errmap
298 if len(filemap) == 0 {
299 delete(errmap, filename)
303 // there should be no expected errors left
305 t.Errorf("--- %s: unreported errors:", pkgName)
306 for filename, filemap := range errmap {
307 for line, errList := range filemap {
308 for _, err := range errList {
309 t.Errorf("%s:%d:%d: %s", filename, line, err.col, err.text)
316 func readCode(err Error) errors.Code {
317 v := reflect.ValueOf(err)
318 return errors.Code(v.FieldByName("go116code").Int())
321 // boolFieldAddr(conf, name) returns the address of the boolean field conf.<name>.
322 // For accessing unexported fields.
323 func boolFieldAddr(conf *Config, name string) *bool {
324 v := reflect.Indirect(reflect.ValueOf(conf))
325 return (*bool)(v.FieldByName(name).Addr().UnsafePointer())
328 // stringFieldAddr(conf, name) returns the address of the string field conf.<name>.
329 // For accessing unexported fields.
330 func stringFieldAddr(conf *Config, name string) *string {
331 v := reflect.Indirect(reflect.ValueOf(conf))
332 return (*string)(v.FieldByName(name).Addr().UnsafePointer())
335 // TestManual is for manual testing of a package - either provided
336 // as a list of filenames belonging to the package, or a directory
337 // name containing the package files - after the test arguments
338 // (and a separating "--"). For instance, to test the package made
339 // of the files foo.go and bar.go, use:
341 // go test -run Manual -- foo.go bar.go
343 // If no source arguments are provided, the file testdata/manual.go
345 // Provide the -verify flag to verify errors against ERROR comments
346 // in the input files rather than having a list of errors reported.
347 // The accepted Go language version can be controlled with the -lang
349 func TestManual(t *testing.T) {
350 testenv.MustHaveGoBuild(t)
352 filenames := flag.Args()
353 if len(filenames) == 0 {
354 filenames = []string{filepath.FromSlash("testdata/manual.go")}
357 info, err := os.Stat(filenames[0])
359 t.Fatalf("TestManual: %v", err)
362 DefPredeclaredTestFuncs()
364 if len(filenames) > 1 {
365 t.Fatal("TestManual: must have only one directory argument")
367 testDir(t, filenames[0], true)
369 testPkg(t, filenames, true)
373 func TestLongConstants(t *testing.T) {
374 format := `package longconst; const _ = %s /* ERROR "constant overflow" */; const _ = %s // ERROR "excessively long constant"`
375 src := fmt.Sprintf(format, strings.Repeat("1", 9999), strings.Repeat("1", 10001))
376 testFiles(t, []string{"longconst.go"}, [][]byte{[]byte(src)}, false)
379 func withSizes(sizes Sizes) func(*Config) {
380 return func(cfg *Config) {
385 // TestIndexRepresentability tests that constant index operands must
386 // be representable as int even if they already have a type that can
387 // represent larger values.
388 func TestIndexRepresentability(t *testing.T) {
389 const src = `package index; var s []byte; var _ = s[int64 /* ERRORx "int64\\(1\\) << 40 \\(.*\\) overflows int" */ (1) << 40]`
390 testFiles(t, []string{"index.go"}, [][]byte{[]byte(src)}, false, withSizes(&StdSizes{4, 4}))
393 func TestIssue47243_TypedRHS(t *testing.T) {
394 // The RHS of the shift expression below overflows uint on 32bit platforms,
395 // but this is OK as it is explicitly typed.
396 const src = `package issue47243; var a uint64; var _ = a << uint64(4294967296)` // uint64(1<<32)
397 testFiles(t, []string{"p.go"}, [][]byte{[]byte(src)}, false, withSizes(&StdSizes{4, 4}))
400 func TestCheck(t *testing.T) {
401 old := buildcfg.Experiment.RangeFunc
403 buildcfg.Experiment.RangeFunc = old
405 buildcfg.Experiment.RangeFunc = true
407 DefPredeclaredTestFuncs()
408 testDirFiles(t, "../../internal/types/testdata/check", false)
410 func TestSpec(t *testing.T) { testDirFiles(t, "../../internal/types/testdata/spec", false) }
411 func TestExamples(t *testing.T) { testDirFiles(t, "../../internal/types/testdata/examples", false) }
412 func TestFixedbugs(t *testing.T) { testDirFiles(t, "../../internal/types/testdata/fixedbugs", false) }
413 func TestLocal(t *testing.T) { testDirFiles(t, "testdata/local", false) }
415 func testDirFiles(t *testing.T, dir string, manual bool) {
416 testenv.MustHaveGoBuild(t)
417 dir = filepath.FromSlash(dir)
419 fis, err := os.ReadDir(dir)
425 for _, fi := range fis {
426 path := filepath.Join(dir, fi.Name())
428 // If fi is a directory, its files make up a single package.
430 testDir(t, path, manual)
432 t.Run(filepath.Base(path), func(t *testing.T) {
433 testPkg(t, []string{path}, manual)
439 func testDir(t *testing.T, dir string, manual bool) {
440 testenv.MustHaveGoBuild(t)
442 fis, err := os.ReadDir(dir)
448 var filenames []string
449 for _, fi := range fis {
450 filenames = append(filenames, filepath.Join(dir, fi.Name()))
453 t.Run(filepath.Base(dir), func(t *testing.T) {
454 testPkg(t, filenames, manual)
458 func testPkg(t *testing.T, filenames []string, manual bool) {
459 srcs := make([][]byte, len(filenames))
460 for i, filename := range filenames {
461 src, err := os.ReadFile(filename)
463 t.Fatalf("could not read %s: %v", filename, err)
467 testFiles(t, filenames, srcs, manual)