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")
61 var fset = token.NewFileSet()
63 func parseFiles(t *testing.T, filenames []string, srcs [][]byte, mode parser.Mode) ([]*ast.File, []error) {
66 for i, filename := range filenames {
67 file, err := parser.ParseFile(fset, filename, srcs[i], mode)
69 t.Fatalf("%s: %s", filename, err)
71 files = append(files, file)
73 if list, _ := err.(scanner.ErrorList); len(list) > 0 {
74 for _, err := range list {
75 errlist = append(errlist, err)
78 errlist = append(errlist, err)
85 func unpackError(fset *token.FileSet, err error) (token.Position, string) {
86 switch err := err.(type) {
88 return err.Pos, err.Msg
90 return fset.Position(err.Pos), err.Msg
95 // absDiff returns the absolute difference between x and y.
96 func absDiff(x, y int) int {
103 // parseFlags parses flags from the first line of the given source if the line
104 // starts with "//" (line comment) followed by "-" (possibly with spaces
105 // between). Otherwise the line is ignored.
106 func parseFlags(src []byte, flags *flag.FlagSet) error {
107 // we must have a line comment that starts with a "-"
109 if !bytes.HasPrefix(src, []byte(prefix)) {
110 return nil // first line is not a line comment
112 src = src[len(prefix):]
113 if i := bytes.Index(src, []byte("-")); i < 0 || len(bytes.TrimSpace(src[:i])) != 0 {
114 return nil // comment doesn't start with a "-"
116 end := bytes.Index(src, []byte("\n"))
118 if end < 0 || end > maxLen {
119 return fmt.Errorf("flags comment line too long")
122 return flags.Parse(strings.Fields(string(src[:end])))
125 // testFiles type-checks the package consisting of the given files, and
126 // compares the resulting errors with the ERROR annotations in the source.
127 // Except for manual tests, each package is type-checked twice, once without
128 // use of _Alias types, and once with _Alias types.
130 // The srcs slice contains the file content for the files named in the
131 // filenames slice. The colDelta parameter specifies the tolerance for position
132 // mismatch when comparing errors. The manual parameter specifies whether this
133 // is a 'manual' test.
135 // If provided, opts may be used to mutate the Config before type-checking.
136 func testFiles(t *testing.T, filenames []string, srcs [][]byte, manual bool, opts ...func(*Config)) {
137 testFilesImpl(t, filenames, srcs, manual, opts...)
139 testFilesImpl(t, filenames, srcs, manual, append(opts, func(conf *Config) { *boolFieldAddr(conf, "_EnableAlias") = true })...)
143 func testFilesImpl(t *testing.T, filenames []string, srcs [][]byte, manual bool, opts ...func(*Config)) {
144 if len(filenames) == 0 {
145 t.Fatal("no source files")
149 files, errlist := parseFiles(t, filenames, srcs, parser.AllErrors)
150 pkgName := "<no package>"
152 pkgName = files[0].Name.Name
154 listErrors := manual && !*verifyErrors
155 if listErrors && len(errlist) > 0 {
156 t.Errorf("--- %s:", pkgName)
157 for _, err := range errlist {
162 // set up typechecker
164 *boolFieldAddr(&conf, "_Trace") = manual && testing.Verbose()
165 conf.Importer = importer.Default()
166 conf.Error = func(err error) {
174 // Ignore secondary error messages starting with "\t";
175 // they are clarifying messages for a primary error.
176 if !strings.Contains(err.Error(), ": \t") {
177 errlist = append(errlist, err)
181 // apply custom configuration
182 for _, opt := range opts {
186 // apply flag setting (overrides custom configuration)
187 var goexperiment string
188 flags := flag.NewFlagSet("", flag.PanicOnError)
189 flags.StringVar(&conf.GoVersion, "lang", "", "")
190 flags.StringVar(&goexperiment, "goexperiment", "", "")
191 flags.BoolVar(&conf.FakeImportC, "fakeImportC", false, "")
192 flags.BoolVar(boolFieldAddr(&conf, "_EnableAlias"), "alias", false, "")
193 if err := parseFlags(srcs[0], flags); err != nil {
196 exp, err := buildcfg.ParseGOEXPERIMENT(runtime.GOOS, runtime.GOARCH, goexperiment)
200 old := buildcfg.Experiment
202 buildcfg.Experiment = old
204 buildcfg.Experiment = *exp
206 // Provide Config.Info with all maps so that info recording is tested.
208 Types: make(map[ast.Expr]TypeAndValue),
209 Instances: make(map[*ast.Ident]Instance),
210 Defs: make(map[*ast.Ident]Object),
211 Uses: make(map[*ast.Ident]Object),
212 Implicits: make(map[ast.Node]Object),
213 Selections: make(map[*ast.SelectorExpr]*Selection),
214 Scopes: make(map[ast.Node]*Scope),
218 conf.Check(pkgName, fset, files, &info)
223 // collect expected errors
224 errmap := make(map[string]map[int][]comment)
225 for i, filename := range filenames {
226 if m := commentMap(srcs[i], regexp.MustCompile("^ ERRORx? ")); len(m) > 0 {
231 // match against found errors
232 var indices []int // list indices of matching errors, reused for each error
233 for _, err := range errlist {
234 gotPos, gotMsg := unpackError(fset, err)
236 // find list of errors for the respective error line
237 filename := gotPos.Filename
238 filemap := errmap[filename]
240 var errList []comment
242 errList = filemap[line]
245 // At least one of the errors in errList should match the current error.
246 indices = indices[:0]
247 for i, want := range errList {
248 pattern, substr := strings.CutPrefix(want.text, " ERROR ")
251 pattern, found = strings.CutPrefix(want.text, " ERRORx ")
256 pattern, err := strconv.Unquote(strings.TrimSpace(pattern))
258 t.Errorf("%s:%d:%d: %v", filename, line, want.col, err)
262 if !strings.Contains(gotMsg, pattern) {
266 rx, err := regexp.Compile(pattern)
268 t.Errorf("%s:%d:%d: %v", filename, line, want.col, err)
271 if !rx.MatchString(gotMsg) {
275 indices = append(indices, i)
277 if len(indices) == 0 {
278 t.Errorf("%s: no error expected: %q", gotPos, gotMsg)
283 // If there are multiple matching errors, select the one with the closest column position.
284 index := -1 // index of matching error
286 for _, i := range indices {
287 if d := absDiff(gotPos.Column, errList[i].col); index < 0 || d < delta {
292 // The closest column position must be within expected colDelta.
293 const colDelta = 0 // go/types errors are positioned correctly
294 if delta > colDelta {
295 t.Errorf("%s: got col = %d; want %d", gotPos, gotPos.Column, errList[index].col)
298 // eliminate from errList
299 if n := len(errList) - 1; n > 0 {
300 // not the last entry - slide entries down (don't reorder)
301 copy(errList[index:], errList[index+1:])
302 filemap[line] = errList[:n]
304 // last entry - remove errList from filemap
305 delete(filemap, line)
308 // if filemap is empty, eliminate from errmap
309 if len(filemap) == 0 {
310 delete(errmap, filename)
314 // there should be no expected errors left
316 t.Errorf("--- %s: unreported errors:", pkgName)
317 for filename, filemap := range errmap {
318 for line, errList := range filemap {
319 for _, err := range errList {
320 t.Errorf("%s:%d:%d: %s", filename, line, err.col, err.text)
327 func readCode(err Error) errors.Code {
328 v := reflect.ValueOf(err)
329 return errors.Code(v.FieldByName("go116code").Int())
332 // boolFieldAddr(conf, name) returns the address of the boolean field conf.<name>.
333 // For accessing unexported fields.
334 func boolFieldAddr(conf *Config, name string) *bool {
335 v := reflect.Indirect(reflect.ValueOf(conf))
336 return (*bool)(v.FieldByName(name).Addr().UnsafePointer())
339 // stringFieldAddr(conf, name) returns the address of the string field conf.<name>.
340 // For accessing unexported fields.
341 func stringFieldAddr(conf *Config, name string) *string {
342 v := reflect.Indirect(reflect.ValueOf(conf))
343 return (*string)(v.FieldByName(name).Addr().UnsafePointer())
346 // TestManual is for manual testing of a package - either provided
347 // as a list of filenames belonging to the package, or a directory
348 // name containing the package files - after the test arguments
349 // (and a separating "--"). For instance, to test the package made
350 // of the files foo.go and bar.go, use:
352 // go test -run Manual -- foo.go bar.go
354 // If no source arguments are provided, the file testdata/manual.go
356 // Provide the -verify flag to verify errors against ERROR comments
357 // in the input files rather than having a list of errors reported.
358 // The accepted Go language version can be controlled with the -lang
360 func TestManual(t *testing.T) {
361 testenv.MustHaveGoBuild(t)
363 filenames := flag.Args()
364 if len(filenames) == 0 {
365 filenames = []string{filepath.FromSlash("testdata/manual.go")}
368 info, err := os.Stat(filenames[0])
370 t.Fatalf("TestManual: %v", err)
373 DefPredeclaredTestFuncs()
375 if len(filenames) > 1 {
376 t.Fatal("TestManual: must have only one directory argument")
378 testDir(t, filenames[0], true)
380 testPkg(t, filenames, true)
384 func TestLongConstants(t *testing.T) {
385 format := `package longconst; const _ = %s /* ERROR "constant overflow" */; const _ = %s // ERROR "excessively long constant"`
386 src := fmt.Sprintf(format, strings.Repeat("1", 9999), strings.Repeat("1", 10001))
387 testFiles(t, []string{"longconst.go"}, [][]byte{[]byte(src)}, false)
390 func withSizes(sizes Sizes) func(*Config) {
391 return func(cfg *Config) {
396 // TestIndexRepresentability tests that constant index operands must
397 // be representable as int even if they already have a type that can
398 // represent larger values.
399 func TestIndexRepresentability(t *testing.T) {
400 const src = `package index; var s []byte; var _ = s[int64 /* ERRORx "int64\\(1\\) << 40 \\(.*\\) overflows int" */ (1) << 40]`
401 testFiles(t, []string{"index.go"}, [][]byte{[]byte(src)}, false, withSizes(&StdSizes{4, 4}))
404 func TestIssue47243_TypedRHS(t *testing.T) {
405 // The RHS of the shift expression below overflows uint on 32bit platforms,
406 // but this is OK as it is explicitly typed.
407 const src = `package issue47243; var a uint64; var _ = a << uint64(4294967296)` // uint64(1<<32)
408 testFiles(t, []string{"p.go"}, [][]byte{[]byte(src)}, false, withSizes(&StdSizes{4, 4}))
411 func TestCheck(t *testing.T) {
412 old := buildcfg.Experiment.RangeFunc
414 buildcfg.Experiment.RangeFunc = old
416 buildcfg.Experiment.RangeFunc = true
418 DefPredeclaredTestFuncs()
419 testDirFiles(t, "../../internal/types/testdata/check", false)
421 func TestSpec(t *testing.T) { testDirFiles(t, "../../internal/types/testdata/spec", false) }
422 func TestExamples(t *testing.T) { testDirFiles(t, "../../internal/types/testdata/examples", false) }
423 func TestFixedbugs(t *testing.T) { testDirFiles(t, "../../internal/types/testdata/fixedbugs", false) }
424 func TestLocal(t *testing.T) { testDirFiles(t, "testdata/local", false) }
426 func testDirFiles(t *testing.T, dir string, manual bool) {
427 testenv.MustHaveGoBuild(t)
428 dir = filepath.FromSlash(dir)
430 fis, err := os.ReadDir(dir)
436 for _, fi := range fis {
437 path := filepath.Join(dir, fi.Name())
439 // If fi is a directory, its files make up a single package.
441 testDir(t, path, manual)
443 t.Run(filepath.Base(path), func(t *testing.T) {
444 testPkg(t, []string{path}, manual)
450 func testDir(t *testing.T, dir string, manual bool) {
451 testenv.MustHaveGoBuild(t)
453 fis, err := os.ReadDir(dir)
459 var filenames []string
460 for _, fi := range fis {
461 filenames = append(filenames, filepath.Join(dir, fi.Name()))
464 t.Run(filepath.Base(dir), func(t *testing.T) {
465 testPkg(t, filenames, manual)
469 func testPkg(t *testing.T, filenames []string, manual bool) {
470 srcs := make([][]byte, len(filenames))
471 for i, filename := range filenames {
472 src, err := os.ReadFile(filename)
474 t.Fatalf("could not read %s: %v", filename, err)
478 testFiles(t, filenames, srcs, manual)