1 // Copyright 2013 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.
12 "go/internal/typeparams"
24 // pkgFor parses and type checks the package specified by path and source,
25 // populating info if provided.
27 // If source begins with "package generic_" and type parameters are enabled,
28 // generic code is permitted.
29 func pkgFor(path, source string, info *Info) (*Package, error) {
30 fset := token.NewFileSet()
31 mode := modeForSource(source)
32 f, err := parser.ParseFile(fset, path, source, mode)
36 conf := Config{Importer: importer.Default()}
37 return conf.Check(f.Name.Name, fset, []*ast.File{f}, info)
40 func mustTypecheck(t *testing.T, path, source string, info *Info) string {
41 pkg, err := pkgFor(path, source, info)
45 name = "package " + pkg.Name()
47 t.Fatalf("%s: didn't type-check (%s)", name, err)
52 // genericPkg is a prefix for packages that should be type checked with
54 const genericPkg = "package generic_"
56 func modeForSource(src string) parser.Mode {
57 if !strings.HasPrefix(src, genericPkg) {
58 return typeparams.DisallowParsing
63 func mayTypecheck(t *testing.T, path, source string, info *Info) (string, error) {
64 fset := token.NewFileSet()
65 mode := modeForSource(source)
66 f, err := parser.ParseFile(fset, path, source, mode)
67 if f == nil { // ignore errors unless f is nil
68 t.Fatalf("%s: unable to parse: %s", path, err)
71 Error: func(err error) {},
72 Importer: importer.Default(),
74 pkg, err := conf.Check(f.Name.Name, fset, []*ast.File{f}, info)
75 return pkg.Name(), err
78 func TestValuesInfo(t *testing.T) {
79 var tests = []struct {
81 expr string // constant expression
82 typ string // constant type
83 val string // constant value
85 {`package a0; const _ = false`, `false`, `untyped bool`, `false`},
86 {`package a1; const _ = 0`, `0`, `untyped int`, `0`},
87 {`package a2; const _ = 'A'`, `'A'`, `untyped rune`, `65`},
88 {`package a3; const _ = 0.`, `0.`, `untyped float`, `0`},
89 {`package a4; const _ = 0i`, `0i`, `untyped complex`, `(0 + 0i)`},
90 {`package a5; const _ = "foo"`, `"foo"`, `untyped string`, `"foo"`},
92 {`package b0; var _ = false`, `false`, `bool`, `false`},
93 {`package b1; var _ = 0`, `0`, `int`, `0`},
94 {`package b2; var _ = 'A'`, `'A'`, `rune`, `65`},
95 {`package b3; var _ = 0.`, `0.`, `float64`, `0`},
96 {`package b4; var _ = 0i`, `0i`, `complex128`, `(0 + 0i)`},
97 {`package b5; var _ = "foo"`, `"foo"`, `string`, `"foo"`},
99 {`package c0a; var _ = bool(false)`, `false`, `bool`, `false`},
100 {`package c0b; var _ = bool(false)`, `bool(false)`, `bool`, `false`},
101 {`package c0c; type T bool; var _ = T(false)`, `T(false)`, `c0c.T`, `false`},
103 {`package c1a; var _ = int(0)`, `0`, `int`, `0`},
104 {`package c1b; var _ = int(0)`, `int(0)`, `int`, `0`},
105 {`package c1c; type T int; var _ = T(0)`, `T(0)`, `c1c.T`, `0`},
107 {`package c2a; var _ = rune('A')`, `'A'`, `rune`, `65`},
108 {`package c2b; var _ = rune('A')`, `rune('A')`, `rune`, `65`},
109 {`package c2c; type T rune; var _ = T('A')`, `T('A')`, `c2c.T`, `65`},
111 {`package c3a; var _ = float32(0.)`, `0.`, `float32`, `0`},
112 {`package c3b; var _ = float32(0.)`, `float32(0.)`, `float32`, `0`},
113 {`package c3c; type T float32; var _ = T(0.)`, `T(0.)`, `c3c.T`, `0`},
115 {`package c4a; var _ = complex64(0i)`, `0i`, `complex64`, `(0 + 0i)`},
116 {`package c4b; var _ = complex64(0i)`, `complex64(0i)`, `complex64`, `(0 + 0i)`},
117 {`package c4c; type T complex64; var _ = T(0i)`, `T(0i)`, `c4c.T`, `(0 + 0i)`},
119 {`package c5a; var _ = string("foo")`, `"foo"`, `string`, `"foo"`},
120 {`package c5b; var _ = string("foo")`, `string("foo")`, `string`, `"foo"`},
121 {`package c5c; type T string; var _ = T("foo")`, `T("foo")`, `c5c.T`, `"foo"`},
122 {`package c5d; var _ = string(65)`, `65`, `untyped int`, `65`},
123 {`package c5e; var _ = string('A')`, `'A'`, `untyped rune`, `65`},
124 {`package c5f; type T string; var _ = T('A')`, `'A'`, `untyped rune`, `65`},
125 {`package c5g; var s uint; var _ = string(1 << s)`, `1 << s`, `untyped int`, ``},
127 {`package d0; var _ = []byte("foo")`, `"foo"`, `string`, `"foo"`},
128 {`package d1; var _ = []byte(string("foo"))`, `"foo"`, `string`, `"foo"`},
129 {`package d2; var _ = []byte(string("foo"))`, `string("foo")`, `string`, `"foo"`},
130 {`package d3; type T []byte; var _ = T("foo")`, `"foo"`, `string`, `"foo"`},
132 {`package e0; const _ = float32( 1e-200)`, `float32(1e-200)`, `float32`, `0`},
133 {`package e1; const _ = float32(-1e-200)`, `float32(-1e-200)`, `float32`, `0`},
134 {`package e2; const _ = float64( 1e-2000)`, `float64(1e-2000)`, `float64`, `0`},
135 {`package e3; const _ = float64(-1e-2000)`, `float64(-1e-2000)`, `float64`, `0`},
136 {`package e4; const _ = complex64( 1e-200)`, `complex64(1e-200)`, `complex64`, `(0 + 0i)`},
137 {`package e5; const _ = complex64(-1e-200)`, `complex64(-1e-200)`, `complex64`, `(0 + 0i)`},
138 {`package e6; const _ = complex128( 1e-2000)`, `complex128(1e-2000)`, `complex128`, `(0 + 0i)`},
139 {`package e7; const _ = complex128(-1e-2000)`, `complex128(-1e-2000)`, `complex128`, `(0 + 0i)`},
141 {`package f0 ; var _ float32 = 1e-200`, `1e-200`, `float32`, `0`},
142 {`package f1 ; var _ float32 = -1e-200`, `-1e-200`, `float32`, `0`},
143 {`package f2a; var _ float64 = 1e-2000`, `1e-2000`, `float64`, `0`},
144 {`package f3a; var _ float64 = -1e-2000`, `-1e-2000`, `float64`, `0`},
145 {`package f2b; var _ = 1e-2000`, `1e-2000`, `float64`, `0`},
146 {`package f3b; var _ = -1e-2000`, `-1e-2000`, `float64`, `0`},
147 {`package f4 ; var _ complex64 = 1e-200 `, `1e-200`, `complex64`, `(0 + 0i)`},
148 {`package f5 ; var _ complex64 = -1e-200 `, `-1e-200`, `complex64`, `(0 + 0i)`},
149 {`package f6a; var _ complex128 = 1e-2000i`, `1e-2000i`, `complex128`, `(0 + 0i)`},
150 {`package f7a; var _ complex128 = -1e-2000i`, `-1e-2000i`, `complex128`, `(0 + 0i)`},
151 {`package f6b; var _ = 1e-2000i`, `1e-2000i`, `complex128`, `(0 + 0i)`},
152 {`package f7b; var _ = -1e-2000i`, `-1e-2000i`, `complex128`, `(0 + 0i)`},
154 {`package g0; const (a = len([iota]int{}); b; c); const _ = c`, `c`, `int`, `2`}, // issue #22341
155 {`package g1; var(j int32; s int; n = 1.0<<s == j)`, `1.0`, `int32`, `1`}, // issue #48422
158 for _, test := range tests {
160 Types: make(map[ast.Expr]TypeAndValue),
162 name := mustTypecheck(t, "ValuesInfo", test.src, &info)
164 // look for expression
166 for e := range info.Types {
167 if ExprString(e) == test.expr {
173 t.Errorf("package %s: no expression found for %s", name, test.expr)
176 tv := info.Types[expr]
178 // check that type is correct
179 if got := tv.Type.String(); got != test.typ {
180 t.Errorf("package %s: got type %s; want %s", name, got, test.typ)
184 // if we have a constant, check that value is correct
186 if got := tv.Value.ExactString(); got != test.val {
187 t.Errorf("package %s: got value %s; want %s", name, got, test.val)
191 t.Errorf("package %s: no constant found; want %s", name, test.val)
197 func TestTypesInfo(t *testing.T) {
198 // Test sources that are not expected to typecheck must start with the broken prefix.
199 const broken = "package broken_"
201 var tests = []struct {
203 expr string // expression
204 typ string // value type
206 // single-valued expressions of untyped constants
207 {`package b0; var x interface{} = false`, `false`, `bool`},
208 {`package b1; var x interface{} = 0`, `0`, `int`},
209 {`package b2; var x interface{} = 0.`, `0.`, `float64`},
210 {`package b3; var x interface{} = 0i`, `0i`, `complex128`},
211 {`package b4; var x interface{} = "foo"`, `"foo"`, `string`},
214 {`package n0; var _ *int = nil`, `nil`, `untyped nil`},
215 {`package n1; var _ func() = nil`, `nil`, `untyped nil`},
216 {`package n2; var _ []byte = nil`, `nil`, `untyped nil`},
217 {`package n3; var _ map[int]int = nil`, `nil`, `untyped nil`},
218 {`package n4; var _ chan int = nil`, `nil`, `untyped nil`},
219 {`package n5; var _ interface{} = nil`, `nil`, `untyped nil`},
220 {`package n6; import "unsafe"; var _ unsafe.Pointer = nil`, `nil`, `untyped nil`},
222 {`package n10; var (x *int; _ = x == nil)`, `nil`, `untyped nil`},
223 {`package n11; var (x func(); _ = x == nil)`, `nil`, `untyped nil`},
224 {`package n12; var (x []byte; _ = x == nil)`, `nil`, `untyped nil`},
225 {`package n13; var (x map[int]int; _ = x == nil)`, `nil`, `untyped nil`},
226 {`package n14; var (x chan int; _ = x == nil)`, `nil`, `untyped nil`},
227 {`package n15; var (x interface{}; _ = x == nil)`, `nil`, `untyped nil`},
228 {`package n15; import "unsafe"; var (x unsafe.Pointer; _ = x == nil)`, `nil`, `untyped nil`},
230 {`package n20; var _ = (*int)(nil)`, `nil`, `untyped nil`},
231 {`package n21; var _ = (func())(nil)`, `nil`, `untyped nil`},
232 {`package n22; var _ = ([]byte)(nil)`, `nil`, `untyped nil`},
233 {`package n23; var _ = (map[int]int)(nil)`, `nil`, `untyped nil`},
234 {`package n24; var _ = (chan int)(nil)`, `nil`, `untyped nil`},
235 {`package n25; var _ = (interface{})(nil)`, `nil`, `untyped nil`},
236 {`package n26; import "unsafe"; var _ = unsafe.Pointer(nil)`, `nil`, `untyped nil`},
238 {`package n30; func f(*int) { f(nil) }`, `nil`, `untyped nil`},
239 {`package n31; func f(func()) { f(nil) }`, `nil`, `untyped nil`},
240 {`package n32; func f([]byte) { f(nil) }`, `nil`, `untyped nil`},
241 {`package n33; func f(map[int]int) { f(nil) }`, `nil`, `untyped nil`},
242 {`package n34; func f(chan int) { f(nil) }`, `nil`, `untyped nil`},
243 {`package n35; func f(interface{}) { f(nil) }`, `nil`, `untyped nil`},
244 {`package n35; import "unsafe"; func f(unsafe.Pointer) { f(nil) }`, `nil`, `untyped nil`},
246 // comma-ok expressions
247 {`package p0; var x interface{}; var _, _ = x.(int)`,
251 {`package p1; var x interface{}; func _() { _, _ = x.(int) }`,
255 {`package p2a; type mybool bool; var m map[string]complex128; var b mybool; func _() { _, b = m["foo"] }`,
257 `(complex128, p2a.mybool)`,
259 {`package p2b; var m map[string]complex128; var b bool; func _() { _, b = m["foo"] }`,
261 `(complex128, bool)`,
263 {`package p3; var c chan string; var _, _ = <-c`,
269 {`package issue6796_a; var x interface{}; var _, _ = (x.(int))`,
273 {`package issue6796_b; var c chan string; var _, _ = (<-c)`,
277 {`package issue6796_c; var c chan string; var _, _ = (<-c)`,
281 {`package issue6796_d; var c chan string; var _, _ = ((<-c))`,
285 {`package issue6796_e; func f(c chan string) { _, _ = ((<-c)) }`,
291 {`package issue7060_a; var ( m map[int]string; x, ok = m[0] )`,
295 {`package issue7060_b; var ( m map[int]string; x, ok interface{} = m[0] )`,
299 {`package issue7060_c; func f(x interface{}, ok bool, m map[int]string) { x, ok = m[0] }`,
303 {`package issue7060_d; var ( ch chan string; x, ok = <-ch )`,
307 {`package issue7060_e; var ( ch chan string; x, ok interface{} = <-ch )`,
311 {`package issue7060_f; func f(x interface{}, ok bool, ch chan string) { x, ok = <-ch }`,
317 {`package issue28277_a; func f(...int)`,
321 {`package issue28277_b; func f(a, b int, c ...[]struct{})`,
327 {`package issue47243_a; var x int32; var _ = x << 3`, `3`, `untyped int`},
328 {`package issue47243_b; var x int32; var _ = x << 3.`, `3.`, `uint`}, // issue 47410: should be untyped float
329 {`package issue47243_c; var x int32; var _ = 1 << x`, `1 << x`, `int`},
330 {`package issue47243_d; var x int32; var _ = 1 << x`, `1`, `int`},
331 {`package issue47243_e; var x int32; var _ = 1 << 2`, `1`, `untyped int`},
332 {`package issue47243_f; var x int32; var _ = 1 << 2`, `2`, `untyped int`},
333 {`package issue47243_g; var x int32; var _ = int(1) << 2`, `2`, `untyped int`},
334 {`package issue47243_h; var x int32; var _ = 1 << (2 << x)`, `1`, `int`},
335 {`package issue47243_i; var x int32; var _ = 1 << (2 << x)`, `(2 << x)`, `untyped int`},
336 {`package issue47243_j; var x int32; var _ = 1 << (2 << x)`, `2`, `untyped int`},
338 // tests for broken code that doesn't parse or type-check
339 {broken + `x0; func _() { var x struct {f string}; x.f := 0 }`, `x.f`, `string`},
340 {broken + `x1; func _() { var z string; type x struct {f string}; y := &x{q: z}}`, `z`, `string`},
341 {broken + `x2; func _() { var a, b string; type x struct {f string}; z := &x{f: a; f: b;}}`, `b`, `string`},
342 {broken + `x3; var x = panic("");`, `panic`, `func(interface{})`},
343 {`package x4; func _() { panic("") }`, `panic`, `func(interface{})`},
344 {broken + `x5; func _() { var x map[string][...]int; x = map[string][...]int{"": {1,2,3}} }`, `x`, `map[string][-1]int`},
346 // parameterized functions
347 {genericPkg + `p0; func f[T any](T) {}; var _ = f[int]`, `f`, `func[generic_p0.T₁ interface{}](generic_p0.T₁)`},
348 {genericPkg + `p1; func f[T any](T) {}; var _ = f[int]`, `f[int]`, `func(int)`},
349 {genericPkg + `p2; func f[T any](T) {}; func _() { f(42) }`, `f`, `func[generic_p2.T₁ interface{}](generic_p2.T₁)`},
350 {genericPkg + `p3; func f[T any](T) {}; func _() { f(42) }`, `f(42)`, `()`},
353 {genericPkg + `t0; type t[] int; var _ t`, `t`, `generic_t0.t`}, // t[] is a syntax error that is ignored in this test in favor of t
354 {genericPkg + `t1; type t[P any] int; var _ t[int]`, `t`, `generic_t1.t[generic_t1.P₁ interface{}]`},
355 {genericPkg + `t2; type t[P interface{}] int; var _ t[int]`, `t`, `generic_t2.t[generic_t2.P₁ interface{}]`},
356 {genericPkg + `t3; type t[P, Q interface{}] int; var _ t[int, int]`, `t`, `generic_t3.t[generic_t3.P₁, generic_t3.Q₂ interface{}]`},
358 // TODO (rFindley): compare with types2, which resolves the type broken_t4.t[P₁, Q₂ interface{m()}] here
359 {broken + `t4; type t[P, Q interface{ m() }] int; var _ t[int, int]`, `t`, `broken_t4.t`},
361 // instantiated types must be sanitized
362 {genericPkg + `g0; type t[P any] int; var x struct{ f t[int] }; var _ = x.f`, `x.f`, `generic_g0.t[int]`},
365 {genericPkg + `issue45096; func _[T interface{ ~int8 | ~int16 | ~int32 }](x T) { _ = x < 0 }`, `0`, `generic_issue45096.T₁`},
368 {`package p; import "unsafe"; type S struct { f int }; var s S; var _ = unsafe.Offsetof(s.f)`, `s.f`, `int`},
371 for _, test := range tests {
372 info := Info{Types: make(map[ast.Expr]TypeAndValue)}
374 if strings.HasPrefix(test.src, broken) {
376 name, err = mayTypecheck(t, "TypesInfo", test.src, &info)
378 t.Errorf("package %s: expected to fail but passed", name)
382 name = mustTypecheck(t, "TypesInfo", test.src, &info)
385 // look for expression type
387 for e, tv := range info.Types {
388 if ExprString(e) == test.expr {
394 t.Errorf("package %s: no type found for %s", name, test.expr)
398 // check that type is correct
399 if got := typ.String(); got != test.typ {
400 t.Errorf("package %s: got %s; want %s", name, got, test.typ)
405 func TestInferredInfo(t *testing.T) {
406 var tests = []struct {
412 {genericPkg + `p0; func f[T any](T) {}; func _() { f(42) }`,
417 {genericPkg + `p1; func f[T any](T) T { panic(0) }; func _() { f('@') }`,
422 {genericPkg + `p2; func f[T any](...T) T { panic(0) }; func _() { f(0i) }`,
424 []string{`complex128`},
425 `func(...complex128) complex128`,
427 {genericPkg + `p3; func f[A, B, C any](A, *B, []C) {}; func _() { f(1.2, new(string), []byte{}) }`,
429 []string{`float64`, `string`, `byte`},
430 `func(float64, *string, []byte)`,
432 {genericPkg + `p4; func f[A, B any](A, *B, ...[]B) {}; func _() { f(1.2, new(byte)) }`,
434 []string{`float64`, `byte`},
435 `func(float64, *byte, ...[]byte)`,
438 {genericPkg + `s1; func f[T any, P interface{~*T}](x T) {}; func _(x string) { f(x) }`,
440 []string{`string`, `*string`},
443 {genericPkg + `s2; func f[T any, P interface{~*T}](x []T) {}; func _(x []int) { f(x) }`,
445 []string{`int`, `*int`},
448 {genericPkg + `s3; type C[T any] interface{~chan<- T}; func f[T any, P C[T]](x []T) {}; func _(x []int) { f(x) }`,
450 []string{`int`, `chan<- int`},
453 {genericPkg + `s4; type C[T any] interface{~chan<- T}; func f[T any, P C[T], Q C[[]*P]](x []T) {}; func _(x []int) { f(x) }`,
455 []string{`int`, `chan<- int`, `chan<- []*chan<- int`},
459 {genericPkg + `t1; func f[T any, P interface{~*T}]() T { panic(0) }; func _() { _ = f[string] }`,
461 []string{`string`, `*string`},
464 {genericPkg + `t2; type C[T any] interface{~chan<- T}; func f[T any, P C[T]]() []T { return nil }; func _() { _ = f[int] }`,
466 []string{`int`, `chan<- int`},
469 {genericPkg + `t3; type C[T any] interface{~chan<- T}; func f[T any, P C[T], Q C[[]*P]]() []T { return nil }; func _() { _ = f[int] }`,
471 []string{`int`, `chan<- int`, `chan<- []*chan<- int`},
476 for _, test := range tests {
478 info.Inferred = make(map[ast.Expr]Inferred)
479 name, err := mayTypecheck(t, "InferredInfo", test.src, &info)
481 t.Errorf("package %s: %v", name, err)
485 // look for inferred type arguments and signature
488 for call, inf := range info.Inferred {
490 switch x := call.(type) {
496 panic(fmt.Sprintf("unexpected call expression type %T", call))
498 if ExprString(fun) == test.fun {
505 t.Errorf("package %s: no inferred information found for %s", name, test.fun)
509 // check that type arguments are correct
510 if targs.Len() != len(test.targs) {
511 t.Errorf("package %s: got %d type arguments; want %d", name, targs.Len(), len(test.targs))
514 for i := 0; i < targs.Len(); i++ {
516 if got := targ.String(); got != test.targs[i] {
517 t.Errorf("package %s, %d. type argument: got %s; want %s", name, i, got, test.targs[i])
522 // check that signature is correct
523 if got := sig.String(); got != test.sig {
524 t.Errorf("package %s: got %s; want %s", name, got, test.sig)
529 func TestDefsInfo(t *testing.T) {
530 var tests = []struct {
535 {`package p0; const x = 42`, `x`, `const p0.x untyped int`},
536 {`package p1; const x int = 42`, `x`, `const p1.x int`},
537 {`package p2; var x int`, `x`, `var p2.x int`},
538 {`package p3; type x int`, `x`, `type p3.x int`},
539 {`package p4; func f()`, `f`, `func p4.f()`},
540 {`package p5; func f() int { x, _ := 1, 2; return x }`, `_`, `var _ int`},
542 // generic types must be sanitized
543 // (need to use sufficiently nested types to provoke unexpanded types)
544 {genericPkg + `g0; type t[P any] P; const x = t[int](42)`, `x`, `const generic_g0.x generic_g0.t[int]`},
545 {genericPkg + `g1; type t[P any] P; var x = t[int](42)`, `x`, `var generic_g1.x generic_g1.t[int]`},
546 {genericPkg + `g2; type t[P any] P; type x struct{ f t[int] }`, `x`, `type generic_g2.x struct{f generic_g2.t[int]}`},
547 {genericPkg + `g3; type t[P any] P; func f(x struct{ f t[string] }); var g = f`, `g`, `var generic_g3.g func(x struct{f generic_g3.t[string]})`},
550 for _, test := range tests {
552 Defs: make(map[*ast.Ident]Object),
554 name := mustTypecheck(t, "DefsInfo", test.src, &info)
558 for id, obj := range info.Defs {
559 if id.Name == test.obj {
565 t.Errorf("package %s: %s not found", name, test.obj)
569 if got := def.String(); got != test.want {
570 t.Errorf("package %s: got %s; want %s", name, got, test.want)
575 func TestUsesInfo(t *testing.T) {
576 var tests = []struct {
581 {`package p0; func _() { _ = x }; const x = 42`, `x`, `const p0.x untyped int`},
582 {`package p1; func _() { _ = x }; const x int = 42`, `x`, `const p1.x int`},
583 {`package p2; func _() { _ = x }; var x int`, `x`, `var p2.x int`},
584 {`package p3; func _() { type _ x }; type x int`, `x`, `type p3.x int`},
585 {`package p4; func _() { _ = f }; func f()`, `f`, `func p4.f()`},
587 // generic types must be sanitized
588 // (need to use sufficiently nested types to provoke unexpanded types)
589 {genericPkg + `g0; func _() { _ = x }; type t[P any] P; const x = t[int](42)`, `x`, `const generic_g0.x generic_g0.t[int]`},
590 {genericPkg + `g1; func _() { _ = x }; type t[P any] P; var x = t[int](42)`, `x`, `var generic_g1.x generic_g1.t[int]`},
591 {genericPkg + `g2; func _() { type _ x }; type t[P any] P; type x struct{ f t[int] }`, `x`, `type generic_g2.x struct{f generic_g2.t[int]}`},
592 {genericPkg + `g3; func _() { _ = f }; type t[P any] P; func f(x struct{ f t[string] })`, `f`, `func generic_g3.f(x struct{f generic_g3.t[string]})`},
595 for _, test := range tests {
597 Uses: make(map[*ast.Ident]Object),
599 name := mustTypecheck(t, "UsesInfo", test.src, &info)
603 for id, obj := range info.Uses {
604 if id.Name == test.obj {
610 t.Errorf("package %s: %s not found", name, test.obj)
614 if got := use.String(); got != test.want {
615 t.Errorf("package %s: got %s; want %s", name, got, test.want)
620 func TestImplicitsInfo(t *testing.T) {
621 testenv.MustHaveGoBuild(t)
623 var tests = []struct {
627 {`package p2; import . "fmt"; var _ = Println`, ""}, // no Implicits entry
628 {`package p0; import local "fmt"; var _ = local.Println`, ""}, // no Implicits entry
629 {`package p1; import "fmt"; var _ = fmt.Println`, "importSpec: package fmt"},
631 {`package p3; func f(x interface{}) { switch x.(type) { case int: } }`, ""}, // no Implicits entry
632 {`package p4; func f(x interface{}) { switch t := x.(type) { case int: _ = t } }`, "caseClause: var t int"},
633 {`package p5; func f(x interface{}) { switch t := x.(type) { case int, uint: _ = t } }`, "caseClause: var t interface{}"},
634 {`package p6; func f(x interface{}) { switch t := x.(type) { default: _ = t } }`, "caseClause: var t interface{}"},
636 {`package p7; func f(x int) {}`, ""}, // no Implicits entry
637 {`package p8; func f(int) {}`, "field: var int"},
638 {`package p9; func f() (complex64) { return 0 }`, "field: var complex64"},
639 {`package p10; type T struct{}; func (*T) f() {}`, "field: var *p10.T"},
642 for _, test := range tests {
644 Implicits: make(map[ast.Node]Object),
646 name := mustTypecheck(t, "ImplicitsInfo", test.src, &info)
648 // the test cases expect at most one Implicits entry
649 if len(info.Implicits) > 1 {
650 t.Errorf("package %s: %d Implicits entries found", name, len(info.Implicits))
654 // extract Implicits entry, if any
656 for n, obj := range info.Implicits {
657 switch x := n.(type) {
658 case *ast.ImportSpec:
660 case *ast.CaseClause:
665 t.Fatalf("package %s: unexpected %T", name, x)
667 got += ": " + obj.String()
671 if got != test.want {
672 t.Errorf("package %s: got %q; want %q", name, got, test.want)
677 func predString(tv TypeAndValue) string {
679 pred := func(b bool, s string) {
682 buf.WriteString(", ")
688 pred(tv.IsVoid(), "void")
689 pred(tv.IsType(), "type")
690 pred(tv.IsBuiltin(), "builtin")
691 pred(tv.IsValue() && tv.Value != nil, "const")
692 pred(tv.IsValue() && tv.Value == nil, "value")
693 pred(tv.IsNil(), "nil")
694 pred(tv.Addressable(), "addressable")
695 pred(tv.Assignable(), "assignable")
696 pred(tv.HasOk(), "hasOk")
704 func TestPredicatesInfo(t *testing.T) {
705 testenv.MustHaveGoBuild(t)
707 var tests = []struct {
713 {`package n0; func f() { f() }`, `f()`, `void`},
716 {`package t0; type _ int`, `int`, `type`},
717 {`package t1; type _ []int`, `[]int`, `type`},
718 {`package t2; type _ func()`, `func()`, `type`},
719 {`package t3; type _ func(int)`, `int`, `type`},
720 {`package t3; type _ func(...int)`, `...int`, `type`},
723 {`package b0; var _ = len("")`, `len`, `builtin`},
724 {`package b1; var _ = (len)("")`, `(len)`, `builtin`},
727 {`package c0; var _ = 42`, `42`, `const`},
728 {`package c1; var _ = "foo" + "bar"`, `"foo" + "bar"`, `const`},
729 {`package c2; const (i = 1i; _ = i)`, `i`, `const`},
732 {`package v0; var (a, b int; _ = a + b)`, `a + b`, `value`},
733 {`package v1; var _ = &[]int{1}`, `([]int literal)`, `value`},
734 {`package v2; var _ = func(){}`, `(func() literal)`, `value`},
735 {`package v4; func f() { _ = f }`, `f`, `value`},
736 {`package v3; var _ *int = nil`, `nil`, `value, nil`},
737 {`package v3; var _ *int = (nil)`, `(nil)`, `value, nil`},
739 // addressable (and thus assignable) operands
740 {`package a0; var (x int; _ = x)`, `x`, `value, addressable, assignable`},
741 {`package a1; var (p *int; _ = *p)`, `*p`, `value, addressable, assignable`},
742 {`package a2; var (s []int; _ = s[0])`, `s[0]`, `value, addressable, assignable`},
743 {`package a3; var (s struct{f int}; _ = s.f)`, `s.f`, `value, addressable, assignable`},
744 {`package a4; var (a [10]int; _ = a[0])`, `a[0]`, `value, addressable, assignable`},
745 {`package a5; func _(x int) { _ = x }`, `x`, `value, addressable, assignable`},
746 {`package a6; func _()(x int) { _ = x; return }`, `x`, `value, addressable, assignable`},
747 {`package a7; type T int; func (x T) _() { _ = x }`, `x`, `value, addressable, assignable`},
748 // composite literals are not addressable
750 // assignable but not addressable values
751 {`package s0; var (m map[int]int; _ = m[0])`, `m[0]`, `value, assignable, hasOk`},
752 {`package s1; var (m map[int]int; _, _ = m[0])`, `m[0]`, `value, assignable, hasOk`},
755 {`package k0; var (ch chan int; _ = <-ch)`, `<-ch`, `value, hasOk`},
756 {`package k1; var (ch chan int; _, _ = <-ch)`, `<-ch`, `value, hasOk`},
759 // - package names are collected in the Uses map
760 // - identifiers being declared are collected in the Defs map
761 {`package m0; import "os"; func _() { _ = os.Stdout }`, `os`, `<missing>`},
762 {`package m1; import p "os"; func _() { _ = p.Stdout }`, `p`, `<missing>`},
763 {`package m2; const c = 0`, `c`, `<missing>`},
764 {`package m3; type T int`, `T`, `<missing>`},
765 {`package m4; var v int`, `v`, `<missing>`},
766 {`package m5; func f() {}`, `f`, `<missing>`},
767 {`package m6; func _(x int) {}`, `x`, `<missing>`},
768 {`package m6; func _()(x int) { return }`, `x`, `<missing>`},
769 {`package m6; type T int; func (x T) _() {}`, `x`, `<missing>`},
772 for _, test := range tests {
773 info := Info{Types: make(map[ast.Expr]TypeAndValue)}
774 name := mustTypecheck(t, "PredicatesInfo", test.src, &info)
776 // look for expression predicates
778 for e, tv := range info.Types {
779 //println(name, ExprString(e))
780 if ExprString(e) == test.expr {
786 if got != test.pred {
787 t.Errorf("package %s: got %s; want %s", name, got, test.pred)
792 func TestScopesInfo(t *testing.T) {
793 testenv.MustHaveGoBuild(t)
795 var tests = []struct {
797 scopes []string // list of scope descriptors of the form kind:varlist
799 {`package p0`, []string{
802 {`package p1; import ( "fmt"; m "math"; _ "os" ); var ( _ = fmt.Println; _ = m.Pi )`, []string{
805 {`package p2; func _() {}`, []string{
808 {`package p3; func _(x, y int) {}`, []string{
811 {`package p4; func _(x, y int) { x, z := 1, 2; _ = z }`, []string{
812 "file:", "func:x y z", // redeclaration of x
814 {`package p5; func _(x, y int) (u, _ int) { return }`, []string{
815 "file:", "func:u x y",
817 {`package p6; func _() { { var x int; _ = x } }`, []string{
818 "file:", "func:", "block:x",
820 {`package p7; func _() { if true {} }`, []string{
821 "file:", "func:", "if:", "block:",
823 {`package p8; func _() { if x := 0; x < 0 { y := x; _ = y } }`, []string{
824 "file:", "func:", "if:x", "block:y",
826 {`package p9; func _() { switch x := 0; x {} }`, []string{
827 "file:", "func:", "switch:x",
829 {`package p10; func _() { switch x := 0; x { case 1: y := x; _ = y; default: }}`, []string{
830 "file:", "func:", "switch:x", "case:y", "case:",
832 {`package p11; func _(t interface{}) { switch t.(type) {} }`, []string{
833 "file:", "func:t", "type switch:",
835 {`package p12; func _(t interface{}) { switch t := t; t.(type) {} }`, []string{
836 "file:", "func:t", "type switch:t",
838 {`package p13; func _(t interface{}) { switch x := t.(type) { case int: _ = x } }`, []string{
839 "file:", "func:t", "type switch:", "case:x", // x implicitly declared
841 {`package p14; func _() { select{} }`, []string{
844 {`package p15; func _(c chan int) { select{ case <-c: } }`, []string{
845 "file:", "func:c", "comm:",
847 {`package p16; func _(c chan int) { select{ case i := <-c: x := i; _ = x} }`, []string{
848 "file:", "func:c", "comm:i x",
850 {`package p17; func _() { for{} }`, []string{
851 "file:", "func:", "for:", "block:",
853 {`package p18; func _(n int) { for i := 0; i < n; i++ { _ = i } }`, []string{
854 "file:", "func:n", "for:i", "block:",
856 {`package p19; func _(a []int) { for i := range a { _ = i} }`, []string{
857 "file:", "func:a", "range:i", "block:",
859 {`package p20; var s int; func _(a []int) { for i, x := range a { s += x; _ = i } }`, []string{
860 "file:", "func:a", "range:i x", "block:",
864 for _, test := range tests {
865 info := Info{Scopes: make(map[ast.Node]*Scope)}
866 name := mustTypecheck(t, "ScopesInfo", test.src, &info)
868 // number of scopes must match
869 if len(info.Scopes) != len(test.scopes) {
870 t.Errorf("package %s: got %d scopes; want %d", name, len(info.Scopes), len(test.scopes))
873 // scope descriptions must match
874 for node, scope := range info.Scopes {
875 kind := "<unknown node kind>"
885 case *ast.SwitchStmt:
887 case *ast.TypeSwitchStmt:
889 case *ast.CaseClause:
891 case *ast.CommClause:
899 // look for matching scope description
900 desc := kind + ":" + strings.Join(scope.Names(), " ")
902 for _, d := range test.scopes {
909 t.Errorf("package %s: no matching scope found for %s", name, desc)
915 func TestInitOrderInfo(t *testing.T) {
916 var tests = []struct {
920 {`package p0; var (x = 1; y = x)`, []string{
923 {`package p1; var (a = 1; b = 2; c = 3)`, []string{
924 "a = 1", "b = 2", "c = 3",
926 {`package p2; var (a, b, c = 1, 2, 3)`, []string{
927 "a = 1", "b = 2", "c = 3",
929 {`package p3; var _ = f(); func f() int { return 1 }`, []string{
930 "_ = f()", // blank var
932 {`package p4; var (a = 0; x = y; y = z; z = 0)`, []string{
933 "a = 0", "z = 0", "y = z", "x = y",
935 {`package p5; var (a, _ = m[0]; m map[int]string)`, []string{
936 "a, _ = m[0]", // blank var
938 {`package p6; var a, b = f(); func f() (_, _ int) { return z, z }; var z = 0`, []string{
939 "z = 0", "a, b = f()",
941 {`package p7; var (a = func() int { return b }(); b = 1)`, []string{
942 "b = 1", "a = (func() int literal)()",
944 {`package p8; var (a, b = func() (_, _ int) { return c, c }(); c = 1)`, []string{
945 "c = 1", "a, b = (func() (_, _ int) literal)()",
947 {`package p9; type T struct{}; func (T) m() int { _ = y; return 0 }; var x, y = T.m, 1`, []string{
950 {`package p10; var (d = c + b; a = 0; b = 0; c = 0)`, []string{
951 "a = 0", "b = 0", "c = 0", "d = c + b",
953 {`package p11; var (a = e + c; b = d + c; c = 0; d = 0; e = 0)`, []string{
954 "c = 0", "d = 0", "b = d + c", "e = 0", "a = e + c",
956 // emit an initializer for n:1 initializations only once (not for each node
957 // on the lhs which may appear in different order in the dependency graph)
958 {`package p12; var (a = x; b = 0; x, y = m[0]; m map[int]int)`, []string{
959 "b = 0", "x, y = m[0]", "a = x",
961 // test case from spec section on package initialization
975 "d = 3", "b = f()", "c = f()", "a = c + b",
977 // test case for issue 7131
981 func next() int { counter++; return counter }
984 func makeOrder() []int { return []int{f, b, d, e, c, a} }
987 var b, c = next(), next()
988 var d, e, f = next(), next(), next()
990 "a = next()", "b = next()", "c = next()", "d = next()", "e = next()", "f = next()", "_ = makeOrder()",
992 // test case for issue 10709
1002 func (T) m() int { return 0 }
1004 func makeT(n int) T {
1010 "t = makeT(0)", "v = t.m()",
1012 // test case for issue 10709: same as test before, but variable decls swapped
1022 func (T) m() int { return 0 }
1024 func makeT(n int) T {
1030 "t = makeT(0)", "v = t.m()",
1032 // another candidate possibly causing problems with issue 10709
1037 func f1() int { return g1() }
1038 func g1() int { f1(); return x1 }
1044 func f2() int { return g2() }
1045 func g2() int { return x2 }
1047 var x2 = 0`, []string{
1048 "x1 = 0", "y1 = f1()", "x2 = 0", "y2 = f2()",
1052 for _, test := range tests {
1054 name := mustTypecheck(t, "InitOrderInfo", test.src, &info)
1056 // number of initializers must match
1057 if len(info.InitOrder) != len(test.inits) {
1058 t.Errorf("package %s: got %d initializers; want %d", name, len(info.InitOrder), len(test.inits))
1062 // initializers must match
1063 for i, want := range test.inits {
1064 got := info.InitOrder[i].String()
1066 t.Errorf("package %s, init %d: got %s; want %s", name, i, got, want)
1073 func TestMultiFileInitOrder(t *testing.T) {
1074 fset := token.NewFileSet()
1075 mustParse := func(src string) *ast.File {
1076 f, err := parser.ParseFile(fset, "main", src, 0)
1083 fileA := mustParse(`package main; var a = 1`)
1084 fileB := mustParse(`package main; var b = 2`)
1086 // The initialization order must not depend on the parse
1087 // order of the files, only on the presentation order to
1088 // the type-checker.
1089 for _, test := range []struct {
1093 {[]*ast.File{fileA, fileB}, "[a = 1 b = 2]"},
1094 {[]*ast.File{fileB, fileA}, "[b = 2 a = 1]"},
1097 if _, err := new(Config).Check("main", fset, test.files, &info); err != nil {
1100 if got := fmt.Sprint(info.InitOrder); got != test.want {
1101 t.Fatalf("got %s; want %s", got, test.want)
1106 func TestFiles(t *testing.T) {
1107 var sources = []string{
1108 "package p; type T struct{}; func (T) m1() {}",
1109 "package p; func (T) m2() {}; var x interface{ m1(); m2() } = T{}",
1110 "package p; func (T) m3() {}; var y interface{ m1(); m2(); m3() } = T{}",
1115 fset := token.NewFileSet()
1116 pkg := NewPackage("p", "p")
1118 check := NewChecker(&conf, fset, pkg, &info)
1120 for i, src := range sources {
1121 filename := fmt.Sprintf("sources%d", i)
1122 f, err := parser.ParseFile(fset, filename, src, 0)
1126 if err := check.Files([]*ast.File{f}); err != nil {
1131 // check InitOrder is [x y]
1133 for _, init := range info.InitOrder {
1134 for _, v := range init.Lhs {
1135 vars = append(vars, v.Name())
1138 if got, want := fmt.Sprint(vars), "[x y]"; got != want {
1139 t.Errorf("InitOrder == %s, want %s", got, want)
1143 type testImporter map[string]*Package
1145 func (m testImporter) Import(path string) (*Package, error) {
1146 if pkg := m[path]; pkg != nil {
1149 return nil, fmt.Errorf("package %q not found", path)
1152 func TestSelection(t *testing.T) {
1153 selections := make(map[*ast.SelectorExpr]*Selection)
1155 fset := token.NewFileSet()
1156 imports := make(testImporter)
1157 conf := Config{Importer: imports}
1158 makePkg := func(path, src string) {
1159 f, err := parser.ParseFile(fset, path+".go", src, 0)
1163 pkg, err := conf.Check(path, fset, []*ast.File{f}, &Info{Selections: selections})
1201 // qualified identifiers
1235 // method expressions
1242 wantOut := map[string][2]string{
1243 "lib.T.M": {"method expr (lib.T) M(lib.T)", ".[0]"},
1245 "A{}.B": {"field (main.A) B *main.B", ".[0]"},
1246 "new(A).B": {"field (*main.A) B *main.B", "->[0]"},
1247 "A{}.C": {"field (main.A) C main.C", ".[1]"},
1248 "new(A).C": {"field (*main.A) C main.C", "->[1]"},
1249 "A{}.b": {"field (main.A) b int", "->[0 0]"},
1250 "new(A).b": {"field (*main.A) b int", "->[0 0]"},
1251 "A{}.c": {"field (main.A) c int", ".[1 0]"},
1252 "new(A).c": {"field (*main.A) c int", "->[1 0]"},
1254 "A{}.f": {"method (main.A) f(int)", "->[0 0]"},
1255 "new(A).f": {"method (*main.A) f(int)", "->[0 0]"},
1256 "A{}.g": {"method (main.A) g()", ".[1 0]"},
1257 "new(A).g": {"method (*main.A) g()", "->[1 0]"},
1258 "new(A).h": {"method (*main.A) h()", "->[1 1]"}, // TODO(gri) should this report .[1 1] ?
1259 "B{}.f": {"method (main.B) f(int)", ".[0]"},
1260 "new(B).f": {"method (*main.B) f(int)", "->[0]"},
1261 "C{}.g": {"method (main.C) g()", ".[0]"},
1262 "new(C).g": {"method (*main.C) g()", "->[0]"},
1263 "new(C).h": {"method (*main.C) h()", "->[1]"}, // TODO(gri) should this report .[1] ?
1265 "A.f": {"method expr (main.A) f(main.A, int)", "->[0 0]"},
1266 "(*A).f": {"method expr (*main.A) f(*main.A, int)", "->[0 0]"},
1267 "B.f": {"method expr (main.B) f(main.B, int)", ".[0]"},
1268 "(*B).f": {"method expr (*main.B) f(*main.B, int)", "->[0]"},
1271 makePkg("lib", libSrc)
1272 makePkg("main", mainSrc)
1274 for e, sel := range selections {
1275 _ = sel.String() // assertion: must not panic
1277 start := fset.Position(e.Pos()).Offset
1278 end := fset.Position(e.End()).Offset
1279 syntax := mainSrc[start:end] // (all SelectorExprs are in main, not lib)
1287 fmt.Sprintf("%s%v", direct, sel.Index()),
1289 want := wantOut[syntax]
1291 t.Errorf("%s: got %q; want %q", syntax, got, want)
1293 delete(wantOut, syntax)
1295 // We must explicitly assert properties of the
1296 // Signature's receiver since it doesn't participate
1297 // in Identical() or String().
1298 sig, _ := sel.Type().(*Signature)
1299 if sel.Kind() == MethodVal {
1300 got := sig.Recv().Type()
1302 if !Identical(got, want) {
1303 t.Errorf("%s: Recv() = %s, want %s", syntax, got, want)
1305 } else if sig != nil && sig.Recv() != nil {
1306 t.Errorf("%s: signature has receiver %s", sig, sig.Recv().Type())
1309 // Assert that all wantOut entries were used exactly once.
1310 for syntax := range wantOut {
1311 t.Errorf("no ast.Selection found with syntax %q", syntax)
1315 func TestIssue8518(t *testing.T) {
1316 fset := token.NewFileSet()
1317 imports := make(testImporter)
1319 Error: func(err error) { t.Log(err) }, // don't exit after first error
1322 makePkg := func(path, src string) {
1323 f, err := parser.ParseFile(fset, path, src, 0)
1327 pkg, _ := conf.Check(path, fset, []*ast.File{f}, nil) // errors logged via conf.Error
1335 const C2 = missing.C
1345 makePkg("a", libSrc)
1346 makePkg("main", mainSrc) // don't crash when type-checking this package
1349 func TestLookupFieldOrMethod(t *testing.T) {
1350 // Test cases assume a lookup of the form a.f or x.f, where a stands for an
1351 // addressable value, and x for a non-addressable value (even though a variable
1352 // for ease of test case writing).
1354 // Should be kept in sync with TestMethodSet.
1355 var tests = []struct {
1362 {"var x T; type T struct{}", false, nil, false},
1363 {"var x T; type T struct{ f int }", true, []int{0}, false},
1364 {"var x T; type T struct{ a, b, f, c int }", true, []int{2}, false},
1367 {"var a T; type T struct{}; func (T) f() {}", true, []int{0}, false},
1368 {"var a *T; type T struct{}; func (T) f() {}", true, []int{0}, true},
1369 {"var a T; type T struct{}; func (*T) f() {}", true, []int{0}, false},
1370 {"var a *T; type T struct{}; func (*T) f() {}", true, []int{0}, true}, // TODO(gri) should this report indirect = false?
1373 {"type ( E1 struct{ f int }; E2 struct{ f int }; x struct{ E1; *E2 })", false, []int{1, 0}, false},
1374 {"type ( E1 struct{ f int }; E2 struct{}; x struct{ E1; *E2 }); func (E2) f() {}", false, []int{1, 0}, false},
1376 // outside methodset
1377 // (*T).f method exists, but value of type T is not addressable
1378 {"var x T; type T struct{}; func (*T) f() {}", false, nil, true},
1381 for _, test := range tests {
1382 pkg, err := pkgFor("test", "package p;"+test.src, nil)
1384 t.Errorf("%s: incorrect test case: %s", test.src, err)
1388 obj := pkg.Scope().Lookup("a")
1390 if obj = pkg.Scope().Lookup("x"); obj == nil {
1391 t.Errorf("%s: incorrect test case - no object a or x", test.src)
1396 f, index, indirect := LookupFieldOrMethod(obj.Type(), obj.Name() == "a", pkg, "f")
1397 if (f != nil) != test.found {
1399 t.Errorf("%s: got no object; want one", test.src)
1401 t.Errorf("%s: got object = %v; want none", test.src, f)
1404 if !sameSlice(index, test.index) {
1405 t.Errorf("%s: got index = %v; want %v", test.src, index, test.index)
1407 if indirect != test.indirect {
1408 t.Errorf("%s: got indirect = %v; want %v", test.src, indirect, test.indirect)
1413 func sameSlice(a, b []int) bool {
1414 if len(a) != len(b) {
1417 for i, x := range a {
1425 // TestScopeLookupParent ensures that (*Scope).LookupParent returns
1426 // the correct result at various positions with the source.
1427 func TestScopeLookupParent(t *testing.T) {
1428 fset := token.NewFileSet()
1429 imports := make(testImporter)
1430 conf := Config{Importer: imports}
1431 mustParse := func(src string) *ast.File {
1432 f, err := parser.ParseFile(fset, "dummy.go", src, parser.ParseComments)
1439 makePkg := func(path string, files ...*ast.File) {
1441 imports[path], err = conf.Check(path, fset, files, &info)
1447 makePkg("lib", mustParse("package lib; var X int"))
1448 // Each /*name=kind:line*/ comment makes the test look up the
1449 // name at that point and checks that it resolves to a decl of
1450 // the specified kind and line number. "undef" means undefined.
1452 /*lib=pkgname:5*/ /*X=var:1*/ /*Pi=const:8*/ /*T=typename:9*/ /*Y=var:10*/ /*F=func:12*/
1463 const pi, e = 3.1415, /*pi=undef*/ 2.71828 /*pi=const:13*/ /*e=const:13*/
1464 type /*t=undef*/ t /*t=typename:14*/ *t
1465 print(Y) /*Y=var:10*/
1466 x, Y := Y, /*x=undef*/ /*Y=var:10*/ Pi /*x=var:16*/ /*Y=var:16*/ ; _ = x; _ = Y
1467 var F = /*F=func:12*/ F /*F=var:17*/ ; _ = F
1470 for i, x := range /*i=undef*/ /*x=var:16*/ a /*i=var:20*/ /*x=var:20*/ { _ = i; _ = x }
1473 switch y := i.(type) { /*y=undef*/
1474 case /*y=undef*/ int /*y=var:23*/ :
1475 case float32, /*y=undef*/ float64 /*y=var:23*/ :
1476 default /*y=var:23*/:
1481 switch int := i.(type) {
1482 case /*int=typename:0*/ int /*int=var:31*/ :
1484 default /*int=var:31*/ :
1490 info.Uses = make(map[*ast.Ident]Object)
1491 f := mustParse(mainSrc)
1493 mainScope := imports["main"].Scope()
1494 rx := regexp.MustCompile(`^/\*(\w*)=([\w:]*)\*/$`)
1495 for _, group := range f.Comments {
1496 for _, comment := range group.List {
1497 // Parse the assertion in the comment.
1498 m := rx.FindStringSubmatch(comment.Text)
1500 t.Errorf("%s: bad comment: %s",
1501 fset.Position(comment.Pos()), comment.Text)
1504 name, want := m[1], m[2]
1506 // Look up the name in the innermost enclosing scope.
1507 inner := mainScope.Innermost(comment.Pos())
1509 t.Errorf("%s: at %s: can't find innermost scope",
1510 fset.Position(comment.Pos()), comment.Text)
1514 if _, obj := inner.LookupParent(name, comment.Pos()); obj != nil {
1515 kind := strings.ToLower(strings.TrimPrefix(reflect.TypeOf(obj).String(), "*types."))
1516 got = fmt.Sprintf("%s:%d", kind, fset.Position(obj.Pos()).Line)
1519 t.Errorf("%s: at %s: %s resolved to %s, want %s",
1520 fset.Position(comment.Pos()), comment.Text, name, got, want)
1525 // Check that for each referring identifier,
1526 // a lookup of its name on the innermost
1527 // enclosing scope returns the correct object.
1529 for id, wantObj := range info.Uses {
1530 inner := mainScope.Innermost(id.Pos())
1532 t.Errorf("%s: can't find innermost scope enclosing %q",
1533 fset.Position(id.Pos()), id.Name)
1537 // Exclude selectors and qualified identifiers---lexical
1538 // refs only. (Ideally, we'd see if the AST parent is a
1539 // SelectorExpr, but that requires PathEnclosingInterval
1540 // from golang.org/x/tools/go/ast/astutil.)
1545 _, gotObj := inner.LookupParent(id.Name, id.Pos())
1546 if gotObj != wantObj {
1547 t.Errorf("%s: got %v, want %v",
1548 fset.Position(id.Pos()), gotObj, wantObj)
1554 // newDefined creates a new defined type named T with the given underlying type.
1555 // Helper function for use with TestIncompleteInterfaces only.
1556 func newDefined(underlying Type) *Named {
1557 tname := NewTypeName(token.NoPos, nil, "T", nil)
1558 return NewNamed(tname, underlying, nil)
1561 func TestConvertibleTo(t *testing.T) {
1562 for _, test := range []struct {
1566 {Typ[Int], Typ[Int], true},
1567 {Typ[Int], Typ[Float32], true},
1568 {newDefined(Typ[Int]), Typ[Int], true},
1569 {newDefined(new(Struct)), new(Struct), true},
1570 {newDefined(Typ[Int]), new(Struct), false},
1571 {Typ[UntypedInt], Typ[Int], true},
1572 {NewSlice(Typ[Int]), NewPointer(NewArray(Typ[Int], 10)), true},
1573 {NewSlice(Typ[Int]), NewArray(Typ[Int], 10), false},
1574 {NewSlice(Typ[Int]), NewPointer(NewArray(Typ[Uint], 10)), false},
1575 // Untyped string values are not permitted by the spec, so the below
1576 // behavior is undefined.
1577 {Typ[UntypedString], Typ[String], true},
1579 if got := ConvertibleTo(test.v, test.t); got != test.want {
1580 t.Errorf("ConvertibleTo(%v, %v) = %t, want %t", test.v, test.t, got, test.want)
1585 func TestAssignableTo(t *testing.T) {
1586 for _, test := range []struct {
1590 {Typ[Int], Typ[Int], true},
1591 {Typ[Int], Typ[Float32], false},
1592 {newDefined(Typ[Int]), Typ[Int], false},
1593 {newDefined(new(Struct)), new(Struct), true},
1594 {Typ[UntypedBool], Typ[Bool], true},
1595 {Typ[UntypedString], Typ[Bool], false},
1596 // Neither untyped string nor untyped numeric assignments arise during
1597 // normal type checking, so the below behavior is technically undefined by
1599 {Typ[UntypedString], Typ[String], true},
1600 {Typ[UntypedInt], Typ[Int], true},
1602 if got := AssignableTo(test.v, test.t); got != test.want {
1603 t.Errorf("AssignableTo(%v, %v) = %t, want %t", test.v, test.t, got, test.want)
1608 func TestIdentical_issue15173(t *testing.T) {
1609 // Identical should allow nil arguments and be symmetric.
1610 for _, test := range []struct {
1614 {Typ[Int], Typ[Int], true},
1615 {Typ[Int], nil, false},
1616 {nil, Typ[Int], false},
1619 if got := Identical(test.x, test.y); got != test.want {
1620 t.Errorf("Identical(%v, %v) = %t", test.x, test.y, got)
1625 func TestIdenticalUnions(t *testing.T) {
1626 tname := NewTypeName(token.NoPos, nil, "myInt", nil)
1627 myInt := NewNamed(tname, Typ[Int], nil)
1628 tmap := map[string]*Term{
1629 "int": NewTerm(false, Typ[Int]),
1630 "~int": NewTerm(true, Typ[Int]),
1631 "string": NewTerm(false, Typ[String]),
1632 "~string": NewTerm(true, Typ[String]),
1633 "myInt": NewTerm(false, myInt),
1635 makeUnion := func(s string) *Union {
1636 parts := strings.Split(s, "|")
1638 for _, p := range parts {
1641 t.Fatalf("missing term %q", p)
1643 terms = append(terms, term)
1645 return NewUnion(terms)
1647 for _, test := range []struct {
1651 // These tests are just sanity checks. The tests for type sets and
1652 // interfaces provide much more test coverage.
1653 {"int|~int", "~int", true},
1654 {"myInt|~int", "~int", true},
1655 {"int|string", "string|int", true},
1656 {"int|int|string", "string|int", true},
1657 {"myInt|string", "int|string", false},
1659 x := makeUnion(test.x)
1660 y := makeUnion(test.y)
1661 if got := Identical(x, y); got != test.want {
1662 t.Errorf("Identical(%v, %v) = %t", test.x, test.y, got)
1667 func TestIssue15305(t *testing.T) {
1668 const src = "package p; func f() int16; var _ = f(undef)"
1669 fset := token.NewFileSet()
1670 f, err := parser.ParseFile(fset, "issue15305.go", src, 0)
1675 Error: func(err error) {}, // allow errors
1678 Types: make(map[ast.Expr]TypeAndValue),
1680 conf.Check("p", fset, []*ast.File{f}, info) // ignore result
1681 for e, tv := range info.Types {
1682 if _, ok := e.(*ast.CallExpr); ok {
1683 if tv.Type != Typ[Int16] {
1684 t.Errorf("CallExpr has type %v, want int16", tv.Type)
1689 t.Errorf("CallExpr has no type")
1692 // TestCompositeLitTypes verifies that Info.Types registers the correct
1693 // types for composite literal expressions and composite literal type
1695 func TestCompositeLitTypes(t *testing.T) {
1696 for _, test := range []struct {
1699 {`[16]byte{}`, `[16]byte`},
1700 {`[...]byte{}`, `[0]byte`}, // test for issue #14092
1701 {`[...]int{1, 2, 3}`, `[3]int`}, // test for issue #14092
1702 {`[...]int{90: 0, 98: 1, 2}`, `[100]int`}, // test for issue #14092
1703 {`[]int{}`, `[]int`},
1704 {`map[string]bool{"foo": true}`, `map[string]bool`},
1705 {`struct{}{}`, `struct{}`},
1706 {`struct{x, y int; z complex128}{}`, `struct{x int; y int; z complex128}`},
1708 fset := token.NewFileSet()
1709 f, err := parser.ParseFile(fset, test.lit, "package p; var _ = "+test.lit, 0)
1711 t.Fatalf("%s: %v", test.lit, err)
1715 Types: make(map[ast.Expr]TypeAndValue),
1717 if _, err = new(Config).Check("p", fset, []*ast.File{f}, info); err != nil {
1718 t.Fatalf("%s: %v", test.lit, err)
1721 cmptype := func(x ast.Expr, want string) {
1722 tv, ok := info.Types[x]
1724 t.Errorf("%s: no Types entry found", test.lit)
1728 t.Errorf("%s: type is nil", test.lit)
1731 if got := tv.Type.String(); got != want {
1732 t.Errorf("%s: got %v, want %s", test.lit, got, want)
1736 // test type of composite literal expression
1737 rhs := f.Decls[0].(*ast.GenDecl).Specs[0].(*ast.ValueSpec).Values[0]
1738 cmptype(rhs, test.typ)
1740 // test type of composite literal type expression
1741 cmptype(rhs.(*ast.CompositeLit).Type, test.typ)
1745 // TestObjectParents verifies that objects have parent scopes or not
1746 // as specified by the Object interface.
1747 func TestObjectParents(t *testing.T) {
1766 func f(x int) { y := x; print(y) }
1769 fset := token.NewFileSet()
1770 f, err := parser.ParseFile(fset, "src", src, 0)
1776 Defs: make(map[*ast.Ident]Object),
1778 if _, err = new(Config).Check("p", fset, []*ast.File{f}, info); err != nil {
1782 for ident, obj := range info.Defs {
1784 // only package names and implicit vars have a nil object
1785 // (in this test we only need to handle the package name)
1786 if ident.Name != "p" {
1787 t.Errorf("%v has nil object", ident)
1792 // struct fields, type-associated and interface methods
1793 // have no parent scope
1795 switch obj := obj.(type) {
1801 if obj.Type().(*Signature).Recv() != nil { // method
1806 gotParent := obj.Parent() != nil
1808 case gotParent && !wantParent:
1809 t.Errorf("%v: want no parent, got %s", ident, obj.Parent())
1810 case !gotParent && wantParent:
1811 t.Errorf("%v: no parent found", ident)
1816 // TestFailedImport tests that we don't get follow-on errors
1817 // elsewhere in a package due to failing to import a package.
1818 func TestFailedImport(t *testing.T) {
1819 testenv.MustHaveGoBuild(t)
1824 import foo "go/types/thisdirectorymustnotexistotherwisethistestmayfail/foo" // should only see an error here
1829 func f(x T) T { return foo.F(x) }
1831 fset := token.NewFileSet()
1832 f, err := parser.ParseFile(fset, "src", src, 0)
1836 files := []*ast.File{f}
1838 // type-check using all possible importers
1839 for _, compiler := range []string{"gc", "gccgo", "source"} {
1842 Error: func(err error) {
1843 // we should only see the import error
1844 if errcount > 0 || !strings.Contains(err.Error(), "could not import") {
1845 t.Errorf("for %s importer, got unexpected error: %v", compiler, err)
1849 Importer: importer.For(compiler, nil),
1853 Uses: make(map[*ast.Ident]Object),
1855 pkg, _ := conf.Check("p", fset, files, info)
1857 t.Errorf("for %s importer, type-checking failed to return a package", compiler)
1861 imports := pkg.Imports()
1862 if len(imports) != 1 {
1863 t.Errorf("for %s importer, got %d imports, want 1", compiler, len(imports))
1867 if imp.Name() != "foo" {
1868 t.Errorf(`for %s importer, got %q, want "foo"`, compiler, imp.Name())
1872 // verify that all uses of foo refer to the imported package foo (imp)
1873 for ident, obj := range info.Uses {
1874 if ident.Name == "foo" {
1875 if obj, ok := obj.(*PkgName); ok {
1876 if obj.Imported() != imp {
1877 t.Errorf("%s resolved to %v; want %v", ident, obj.Imported(), imp)
1880 t.Errorf("%s resolved to %v; want package name", ident, obj)
1887 func TestInstantiate(t *testing.T) {
1888 // eventually we like more tests but this is a start
1889 const src = genericPkg + "p; type T[P any] *T[P]"
1890 pkg, err := pkgFor(".", src, nil)
1895 // type T should have one type parameter
1896 T := pkg.Scope().Lookup("T").Type().(*Named)
1897 if n := T.TypeParams().Len(); n != 1 {
1898 t.Fatalf("expected 1 type parameter; found %d", n)
1901 // instantiation should succeed (no endless recursion)
1902 // even with a nil *Checker
1903 res, err := Instantiate(nil, T, []Type{Typ[Int]}, false)
1908 // instantiated type should point to itself
1909 if p := res.Underlying().(*Pointer).Elem(); p != res {
1910 t.Fatalf("unexpected result type: %s points to %s", res, p)
1914 func TestInstantiateErrors(t *testing.T) {
1916 src string // by convention, T must be the type being instantiated
1918 wantAt int // -1 indicates no error
1920 {"type T[P interface{~string}] int", []Type{Typ[Int]}, 0},
1921 {"type T[P1 interface{int}, P2 interface{~string}] int", []Type{Typ[Int], Typ[Int]}, 1},
1922 {"type T[P1 any, P2 interface{~[]P1}] int", []Type{Typ[Int], NewSlice(Typ[String])}, 1},
1923 {"type T[P1 interface{~[]P2}, P2 any] int", []Type{NewSlice(Typ[String]), Typ[Int]}, 0},
1926 for _, test := range tests {
1927 src := genericPkg + "p; " + test.src
1928 pkg, err := pkgFor(".", src, nil)
1933 T := pkg.Scope().Lookup("T").Type().(*Named)
1935 _, err = Instantiate(nil, T, test.targs, true)
1937 t.Fatalf("Instantiate(%v, %v) returned nil error, want non-nil", T, test.targs)
1940 gotAt := err.(ArgumentError).Index()
1941 if gotAt != test.wantAt {
1942 t.Errorf("Instantate(%v, %v): error at index %d, want index %d", T, test.targs, gotAt, test.wantAt)
1947 func TestInstanceIdentity(t *testing.T) {
1948 imports := make(testImporter)
1949 conf := Config{Importer: imports}
1950 makePkg := func(src string) {
1951 fset := token.NewFileSet()
1952 f, err := parser.ParseFile(fset, "", src, 0)
1957 pkg, err := conf.Check(name, fset, []*ast.File{f}, nil)
1963 makePkg(genericPkg + `lib; type T[P any] struct{}`)
1964 makePkg(genericPkg + `a; import "generic_lib"; var A generic_lib.T[int]`)
1965 makePkg(genericPkg + `b; import "generic_lib"; var B generic_lib.T[int]`)
1966 a := imports["generic_a"].Scope().Lookup("A")
1967 b := imports["generic_b"].Scope().Lookup("B")
1968 if !Identical(a.Type(), b.Type()) {
1969 t.Errorf("mismatching types: a.A: %s, b.B: %s", a.Type(), b.Type())