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.
9 "cmd/compile/internal/syntax"
17 . "cmd/compile/internal/types2"
20 // genericPkg is a source prefix for packages that contain generic code.
21 const genericPkg = "package generic_"
23 // brokenPkg is a source prefix for packages that are not expected to parse
24 // or type-check cleanly. They are always parsed assuming that they contain
26 const brokenPkg = "package broken_"
28 func parseSrc(path, src string) (*syntax.File, error) {
30 if strings.HasPrefix(src, genericPkg) || strings.HasPrefix(src, brokenPkg) {
31 mode = syntax.AllowGenerics
33 errh := func(error) {} // dummy error handler so that parsing continues in presence of errors
34 return syntax.Parse(syntax.NewFileBase(path), strings.NewReader(src), errh, nil, mode)
37 func pkgFor(path, source string, info *Info) (*Package, error) {
38 f, err := parseSrc(path, source)
42 conf := Config{Importer: defaultImporter()}
43 return conf.Check(f.PkgName.Value, []*syntax.File{f}, info)
46 func mustTypecheck(t *testing.T, path, source string, info *Info) string {
47 pkg, err := pkgFor(path, source, info)
51 name = "package " + pkg.Name()
53 t.Fatalf("%s: didn't type-check (%s)", name, err)
58 func mayTypecheck(t *testing.T, path, source string, info *Info) (string, error) {
59 f, err := parseSrc(path, source)
60 if f == nil { // ignore errors unless f is nil
61 t.Fatalf("%s: unable to parse: %s", path, err)
64 Error: func(err error) {},
65 Importer: defaultImporter(),
67 pkg, err := conf.Check(f.PkgName.Value, []*syntax.File{f}, info)
68 return pkg.Name(), err
71 func TestValuesInfo(t *testing.T) {
72 var tests = []struct {
74 expr string // constant expression
75 typ string // constant type
76 val string // constant value
78 {`package a0; const _ = false`, `false`, `untyped bool`, `false`},
79 {`package a1; const _ = 0`, `0`, `untyped int`, `0`},
80 {`package a2; const _ = 'A'`, `'A'`, `untyped rune`, `65`},
81 {`package a3; const _ = 0.`, `0.`, `untyped float`, `0`},
82 {`package a4; const _ = 0i`, `0i`, `untyped complex`, `(0 + 0i)`},
83 {`package a5; const _ = "foo"`, `"foo"`, `untyped string`, `"foo"`},
85 {`package b0; var _ = false`, `false`, `bool`, `false`},
86 {`package b1; var _ = 0`, `0`, `int`, `0`},
87 {`package b2; var _ = 'A'`, `'A'`, `rune`, `65`},
88 {`package b3; var _ = 0.`, `0.`, `float64`, `0`},
89 {`package b4; var _ = 0i`, `0i`, `complex128`, `(0 + 0i)`},
90 {`package b5; var _ = "foo"`, `"foo"`, `string`, `"foo"`},
92 {`package c0a; var _ = bool(false)`, `false`, `bool`, `false`},
93 {`package c0b; var _ = bool(false)`, `bool(false)`, `bool`, `false`},
94 {`package c0c; type T bool; var _ = T(false)`, `T(false)`, `c0c.T`, `false`},
96 {`package c1a; var _ = int(0)`, `0`, `int`, `0`},
97 {`package c1b; var _ = int(0)`, `int(0)`, `int`, `0`},
98 {`package c1c; type T int; var _ = T(0)`, `T(0)`, `c1c.T`, `0`},
100 {`package c2a; var _ = rune('A')`, `'A'`, `rune`, `65`},
101 {`package c2b; var _ = rune('A')`, `rune('A')`, `rune`, `65`},
102 {`package c2c; type T rune; var _ = T('A')`, `T('A')`, `c2c.T`, `65`},
104 {`package c3a; var _ = float32(0.)`, `0.`, `float32`, `0`},
105 {`package c3b; var _ = float32(0.)`, `float32(0.)`, `float32`, `0`},
106 {`package c3c; type T float32; var _ = T(0.)`, `T(0.)`, `c3c.T`, `0`},
108 {`package c4a; var _ = complex64(0i)`, `0i`, `complex64`, `(0 + 0i)`},
109 {`package c4b; var _ = complex64(0i)`, `complex64(0i)`, `complex64`, `(0 + 0i)`},
110 {`package c4c; type T complex64; var _ = T(0i)`, `T(0i)`, `c4c.T`, `(0 + 0i)`},
112 {`package c5a; var _ = string("foo")`, `"foo"`, `string`, `"foo"`},
113 {`package c5b; var _ = string("foo")`, `string("foo")`, `string`, `"foo"`},
114 {`package c5c; type T string; var _ = T("foo")`, `T("foo")`, `c5c.T`, `"foo"`},
115 {`package c5d; var _ = string(65)`, `65`, `untyped int`, `65`},
116 {`package c5e; var _ = string('A')`, `'A'`, `untyped rune`, `65`},
117 {`package c5f; type T string; var _ = T('A')`, `'A'`, `untyped rune`, `65`},
118 {`package c5g; var s uint; var _ = string(1 << s)`, `1 << s`, `untyped int`, ``},
120 {`package d0; var _ = []byte("foo")`, `"foo"`, `string`, `"foo"`},
121 {`package d1; var _ = []byte(string("foo"))`, `"foo"`, `string`, `"foo"`},
122 {`package d2; var _ = []byte(string("foo"))`, `string("foo")`, `string`, `"foo"`},
123 {`package d3; type T []byte; var _ = T("foo")`, `"foo"`, `string`, `"foo"`},
125 {`package e0; const _ = float32( 1e-200)`, `float32(1e-200)`, `float32`, `0`},
126 {`package e1; const _ = float32(-1e-200)`, `float32(-1e-200)`, `float32`, `0`},
127 {`package e2; const _ = float64( 1e-2000)`, `float64(1e-2000)`, `float64`, `0`},
128 {`package e3; const _ = float64(-1e-2000)`, `float64(-1e-2000)`, `float64`, `0`},
129 {`package e4; const _ = complex64( 1e-200)`, `complex64(1e-200)`, `complex64`, `(0 + 0i)`},
130 {`package e5; const _ = complex64(-1e-200)`, `complex64(-1e-200)`, `complex64`, `(0 + 0i)`},
131 {`package e6; const _ = complex128( 1e-2000)`, `complex128(1e-2000)`, `complex128`, `(0 + 0i)`},
132 {`package e7; const _ = complex128(-1e-2000)`, `complex128(-1e-2000)`, `complex128`, `(0 + 0i)`},
134 {`package f0 ; var _ float32 = 1e-200`, `1e-200`, `float32`, `0`},
135 {`package f1 ; var _ float32 = -1e-200`, `-1e-200`, `float32`, `0`},
136 {`package f2a; var _ float64 = 1e-2000`, `1e-2000`, `float64`, `0`},
137 {`package f3a; var _ float64 = -1e-2000`, `-1e-2000`, `float64`, `0`},
138 {`package f2b; var _ = 1e-2000`, `1e-2000`, `float64`, `0`},
139 {`package f3b; var _ = -1e-2000`, `-1e-2000`, `float64`, `0`},
140 {`package f4 ; var _ complex64 = 1e-200 `, `1e-200`, `complex64`, `(0 + 0i)`},
141 {`package f5 ; var _ complex64 = -1e-200 `, `-1e-200`, `complex64`, `(0 + 0i)`},
142 {`package f6a; var _ complex128 = 1e-2000i`, `1e-2000i`, `complex128`, `(0 + 0i)`},
143 {`package f7a; var _ complex128 = -1e-2000i`, `-1e-2000i`, `complex128`, `(0 + 0i)`},
144 {`package f6b; var _ = 1e-2000i`, `1e-2000i`, `complex128`, `(0 + 0i)`},
145 {`package f7b; var _ = -1e-2000i`, `-1e-2000i`, `complex128`, `(0 + 0i)`},
147 {`package g0; const (a = len([iota]int{}); b; c); const _ = c`, `c`, `int`, `2`}, // issue #22341
148 {`package g1; var(j int32; s int; n = 1.0<<s == j)`, `1.0`, `int32`, `1`}, // issue #48422
151 for _, test := range tests {
153 Types: make(map[syntax.Expr]TypeAndValue),
155 name := mustTypecheck(t, "ValuesInfo", test.src, &info)
157 // look for expression
159 for e := range info.Types {
160 if syntax.String(e) == test.expr {
166 t.Errorf("package %s: no expression found for %s", name, test.expr)
169 tv := info.Types[expr]
171 // check that type is correct
172 if got := tv.Type.String(); got != test.typ {
173 t.Errorf("package %s: got type %s; want %s", name, got, test.typ)
177 // if we have a constant, check that value is correct
179 if got := tv.Value.ExactString(); got != test.val {
180 t.Errorf("package %s: got value %s; want %s", name, got, test.val)
184 t.Errorf("package %s: no constant found; want %s", name, test.val)
190 func TestTypesInfo(t *testing.T) {
191 var tests = []struct {
193 expr string // expression
194 typ string // value type
196 // single-valued expressions of untyped constants
197 {`package b0; var x interface{} = false`, `false`, `bool`},
198 {`package b1; var x interface{} = 0`, `0`, `int`},
199 {`package b2; var x interface{} = 0.`, `0.`, `float64`},
200 {`package b3; var x interface{} = 0i`, `0i`, `complex128`},
201 {`package b4; var x interface{} = "foo"`, `"foo"`, `string`},
204 {`package n0; var _ *int = nil`, `nil`, `*int`},
205 {`package n1; var _ func() = nil`, `nil`, `func()`},
206 {`package n2; var _ []byte = nil`, `nil`, `[]byte`},
207 {`package n3; var _ map[int]int = nil`, `nil`, `map[int]int`},
208 {`package n4; var _ chan int = nil`, `nil`, `chan int`},
209 {`package n5a; var _ interface{} = (*int)(nil)`, `nil`, `*int`},
210 {`package n5b; var _ interface{m()} = nil`, `nil`, `interface{m()}`},
211 {`package n6; import "unsafe"; var _ unsafe.Pointer = nil`, `nil`, `unsafe.Pointer`},
213 {`package n10; var (x *int; _ = x == nil)`, `nil`, `*int`},
214 {`package n11; var (x func(); _ = x == nil)`, `nil`, `func()`},
215 {`package n12; var (x []byte; _ = x == nil)`, `nil`, `[]byte`},
216 {`package n13; var (x map[int]int; _ = x == nil)`, `nil`, `map[int]int`},
217 {`package n14; var (x chan int; _ = x == nil)`, `nil`, `chan int`},
218 {`package n15a; var (x interface{}; _ = x == (*int)(nil))`, `nil`, `*int`},
219 {`package n15b; var (x interface{m()}; _ = x == nil)`, `nil`, `interface{m()}`},
220 {`package n15; import "unsafe"; var (x unsafe.Pointer; _ = x == nil)`, `nil`, `unsafe.Pointer`},
222 {`package n20; var _ = (*int)(nil)`, `nil`, `*int`},
223 {`package n21; var _ = (func())(nil)`, `nil`, `func()`},
224 {`package n22; var _ = ([]byte)(nil)`, `nil`, `[]byte`},
225 {`package n23; var _ = (map[int]int)(nil)`, `nil`, `map[int]int`},
226 {`package n24; var _ = (chan int)(nil)`, `nil`, `chan int`},
227 {`package n25a; var _ = (interface{})((*int)(nil))`, `nil`, `*int`},
228 {`package n25b; var _ = (interface{m()})(nil)`, `nil`, `interface{m()}`},
229 {`package n26; import "unsafe"; var _ = unsafe.Pointer(nil)`, `nil`, `unsafe.Pointer`},
231 {`package n30; func f(*int) { f(nil) }`, `nil`, `*int`},
232 {`package n31; func f(func()) { f(nil) }`, `nil`, `func()`},
233 {`package n32; func f([]byte) { f(nil) }`, `nil`, `[]byte`},
234 {`package n33; func f(map[int]int) { f(nil) }`, `nil`, `map[int]int`},
235 {`package n34; func f(chan int) { f(nil) }`, `nil`, `chan int`},
236 {`package n35a; func f(interface{}) { f((*int)(nil)) }`, `nil`, `*int`},
237 {`package n35b; func f(interface{m()}) { f(nil) }`, `nil`, `interface{m()}`},
238 {`package n35; import "unsafe"; func f(unsafe.Pointer) { f(nil) }`, `nil`, `unsafe.Pointer`},
240 // comma-ok expressions
241 {`package p0; var x interface{}; var _, _ = x.(int)`,
245 {`package p1; var x interface{}; func _() { _, _ = x.(int) }`,
249 {`package p2a; type mybool bool; var m map[string]complex128; var b mybool; func _() { _, b = m["foo"] }`,
251 `(complex128, p2a.mybool)`,
253 {`package p2b; var m map[string]complex128; var b bool; func _() { _, b = m["foo"] }`,
255 `(complex128, bool)`,
257 {`package p3; var c chan string; var _, _ = <-c`,
263 {`package issue6796_a; var x interface{}; var _, _ = (x.(int))`,
267 {`package issue6796_b; var c chan string; var _, _ = (<-c)`,
271 {`package issue6796_c; var c chan string; var _, _ = (<-c)`,
275 {`package issue6796_d; var c chan string; var _, _ = ((<-c))`,
279 {`package issue6796_e; func f(c chan string) { _, _ = ((<-c)) }`,
285 {`package issue7060_a; var ( m map[int]string; x, ok = m[0] )`,
289 {`package issue7060_b; var ( m map[int]string; x, ok interface{} = m[0] )`,
293 {`package issue7060_c; func f(x interface{}, ok bool, m map[int]string) { x, ok = m[0] }`,
297 {`package issue7060_d; var ( ch chan string; x, ok = <-ch )`,
301 {`package issue7060_e; var ( ch chan string; x, ok interface{} = <-ch )`,
305 {`package issue7060_f; func f(x interface{}, ok bool, ch chan string) { x, ok = <-ch }`,
311 {`package issue28277_a; func f(...int)`,
315 {`package issue28277_b; func f(a, b int, c ...[]struct{})`,
320 // tests for broken code that doesn't parse or type-check
321 {brokenPkg + `x0; func _() { var x struct {f string}; x.f := 0 }`, `x.f`, `string`},
322 {brokenPkg + `x1; func _() { var z string; type x struct {f string}; y := &x{q: z}}`, `z`, `string`},
323 {brokenPkg + `x2; func _() { var a, b string; type x struct {f string}; z := &x{f: a, f: b,}}`, `b`, `string`},
324 {brokenPkg + `x3; var x = panic("");`, `panic`, `func(interface{})`},
325 {`package x4; func _() { panic("") }`, `panic`, `func(interface{})`},
326 {brokenPkg + `x5; func _() { var x map[string][...]int; x = map[string][...]int{"": {1,2,3}} }`, `x`, `map[string]invalid type`},
328 // parameterized functions
329 {genericPkg + `p0; func f[T any](T) {}; var _ = f[int]`, `f`, `func[generic_p0.T₁ interface{}](generic_p0.T₁)`},
330 {genericPkg + `p1; func f[T any](T) {}; var _ = f[int]`, `f[int]`, `func(int)`},
331 {genericPkg + `p2; func f[T any](T) {}; func _() { f(42) }`, `f`, `func[generic_p2.T₁ interface{}](generic_p2.T₁)`},
332 {genericPkg + `p3; func f[T any](T) {}; func _() { f(42) }`, `f(42)`, `()`},
335 {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
336 {genericPkg + `t1; type t[P any] int; var _ t[int]`, `t`, `generic_t1.t[generic_t1.P₁ interface{}]`},
337 {genericPkg + `t2; type t[P interface{}] int; var _ t[int]`, `t`, `generic_t2.t[generic_t2.P₁ interface{}]`},
338 {genericPkg + `t3; type t[P, Q interface{}] int; var _ t[int, int]`, `t`, `generic_t3.t[generic_t3.P₁, generic_t3.Q₂ interface{}]`},
339 {brokenPkg + `t4; type t[P, Q interface{ m() }] int; var _ t[int, int]`, `t`, `broken_t4.t[broken_t4.P₁, broken_t4.Q₂ interface{m()}]`},
341 // instantiated types must be sanitized
342 {genericPkg + `g0; type t[P any] int; var x struct{ f t[int] }; var _ = x.f`, `x.f`, `generic_g0.t[int]`},
345 {genericPkg + `issue45096; func _[T interface{ ~int8 | ~int16 | ~int32 }](x T) { _ = x < 0 }`, `0`, `generic_issue45096.T₁`},
348 {`package p; import "unsafe"; type S struct { f int }; var s S; var _ = unsafe.Offsetof(s.f)`, `s.f`, `int`},
351 for _, test := range tests {
352 info := Info{Types: make(map[syntax.Expr]TypeAndValue)}
354 if strings.HasPrefix(test.src, brokenPkg) {
356 name, err = mayTypecheck(t, "TypesInfo", test.src, &info)
358 t.Errorf("package %s: expected to fail but passed", name)
362 name = mustTypecheck(t, "TypesInfo", test.src, &info)
365 // look for expression type
367 for e, tv := range info.Types {
368 if syntax.String(e) == test.expr {
374 t.Errorf("package %s: no type found for %s", name, test.expr)
378 // check that type is correct
379 if got := typ.String(); got != test.typ {
380 t.Errorf("package %s: got %s; want %s", name, got, test.typ)
385 func TestInferredInfo(t *testing.T) {
386 var tests = []struct {
392 {genericPkg + `p0; func f[T any](T) {}; func _() { f(42) }`,
397 {genericPkg + `p1; func f[T any](T) T { panic(0) }; func _() { f('@') }`,
402 {genericPkg + `p2; func f[T any](...T) T { panic(0) }; func _() { f(0i) }`,
404 []string{`complex128`},
405 `func(...complex128) complex128`,
407 {genericPkg + `p3; func f[A, B, C any](A, *B, []C) {}; func _() { f(1.2, new(string), []byte{}) }`,
409 []string{`float64`, `string`, `byte`},
410 `func(float64, *string, []byte)`,
412 {genericPkg + `p4; func f[A, B any](A, *B, ...[]B) {}; func _() { f(1.2, new(byte)) }`,
414 []string{`float64`, `byte`},
415 `func(float64, *byte, ...[]byte)`,
418 // we don't know how to translate these but we can type-check them
419 {genericPkg + `q0; type T struct{}; func (T) m[P any](P) {}; func _(x T) { x.m(42) }`,
424 {genericPkg + `q1; type T struct{}; func (T) m[P any](P) P { panic(0) }; func _(x T) { x.m(42) }`,
429 {genericPkg + `q2; type T struct{}; func (T) m[P any](...P) P { panic(0) }; func _(x T) { x.m(42) }`,
434 {genericPkg + `q3; type T struct{}; func (T) m[A, B, C any](A, *B, []C) {}; func _(x T) { x.m(1.2, new(string), []byte{}) }`,
436 []string{`float64`, `string`, `byte`},
437 `func(float64, *string, []byte)`,
439 {genericPkg + `q4; type T struct{}; func (T) m[A, B any](A, *B, ...[]B) {}; func _(x T) { x.m(1.2, new(byte)) }`,
441 []string{`float64`, `byte`},
442 `func(float64, *byte, ...[]byte)`,
445 {genericPkg + `r0; type T[P any] struct{}; func (_ T[P]) m[Q any](Q) {}; func _[P any](x T[P]) { x.m(42) }`,
450 // TODO(gri) record method type parameters in syntax.FuncType so we can check this
451 // {genericPkg + `r1; type T interface{ m[P any](P) }; func _(x T) { x.m(4.2) }`,
453 // []string{`float64`},
457 {genericPkg + `s1; func f[T any, P interface{~*T}](x T) {}; func _(x string) { f(x) }`,
459 []string{`string`, `*string`},
462 {genericPkg + `s2; func f[T any, P interface{~*T}](x []T) {}; func _(x []int) { f(x) }`,
464 []string{`int`, `*int`},
467 {genericPkg + `s3; type C[T any] interface{~chan<- T}; func f[T any, P C[T]](x []T) {}; func _(x []int) { f(x) }`,
469 []string{`int`, `chan<- int`},
472 {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) }`,
474 []string{`int`, `chan<- int`, `chan<- []*chan<- int`},
478 {genericPkg + `t1; func f[T any, P interface{~*T}]() T { panic(0) }; func _() { _ = f[string] }`,
480 []string{`string`, `*string`},
483 {genericPkg + `t2; type C[T any] interface{~chan<- T}; func f[T any, P C[T]]() []T { return nil }; func _() { _ = f[int] }`,
485 []string{`int`, `chan<- int`},
488 {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] }`,
490 []string{`int`, `chan<- int`, `chan<- []*chan<- int`},
495 for _, test := range tests {
496 info := Info{Inferred: make(map[syntax.Expr]Inferred)}
497 name, err := mayTypecheck(t, "InferredInfo", test.src, &info)
499 t.Errorf("package %s: %v", name, err)
503 // look for inferred type arguments and signature
506 for call, inf := range info.Inferred {
508 switch x := call.(type) {
509 case *syntax.CallExpr:
511 case *syntax.IndexExpr:
514 panic(fmt.Sprintf("unexpected call expression type %T", call))
516 if syntax.String(fun) == test.fun {
523 t.Errorf("package %s: no inferred information found for %s", name, test.fun)
527 // check that type arguments are correct
528 if targs.Len() != len(test.targs) {
529 t.Errorf("package %s: got %d type arguments; want %d", name, targs.Len(), len(test.targs))
532 for i := 0; i < targs.Len(); i++ {
534 if got := targ.String(); got != test.targs[i] {
535 t.Errorf("package %s, %d. type argument: got %s; want %s", name, i, got, test.targs[i])
540 // check that signature is correct
541 if got := sig.String(); got != test.sig {
542 t.Errorf("package %s: got %s; want %s", name, got, test.sig)
547 func TestDefsInfo(t *testing.T) {
548 var tests = []struct {
553 {`package p0; const x = 42`, `x`, `const p0.x untyped int`},
554 {`package p1; const x int = 42`, `x`, `const p1.x int`},
555 {`package p2; var x int`, `x`, `var p2.x int`},
556 {`package p3; type x int`, `x`, `type p3.x int`},
557 {`package p4; func f()`, `f`, `func p4.f()`},
558 {`package p5; func f() int { x, _ := 1, 2; return x }`, `_`, `var _ int`},
560 // generic types must be sanitized
561 // (need to use sufficiently nested types to provoke unexpanded types)
562 {genericPkg + `g0; type t[P any] P; const x = t[int](42)`, `x`, `const generic_g0.x generic_g0.t[int]`},
563 {genericPkg + `g1; type t[P any] P; var x = t[int](42)`, `x`, `var generic_g1.x generic_g1.t[int]`},
564 {genericPkg + `g2; type t[P any] P; type x struct{ f t[int] }`, `x`, `type generic_g2.x struct{f generic_g2.t[int]}`},
565 {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]})`},
568 for _, test := range tests {
570 Defs: make(map[*syntax.Name]Object),
572 name := mustTypecheck(t, "DefsInfo", test.src, &info)
576 for id, obj := range info.Defs {
577 if id.Value == test.obj {
583 t.Errorf("package %s: %s not found", name, test.obj)
587 if got := def.String(); got != test.want {
588 t.Errorf("package %s: got %s; want %s", name, got, test.want)
593 func TestUsesInfo(t *testing.T) {
594 var tests = []struct {
599 {`package p0; func _() { _ = x }; const x = 42`, `x`, `const p0.x untyped int`},
600 {`package p1; func _() { _ = x }; const x int = 42`, `x`, `const p1.x int`},
601 {`package p2; func _() { _ = x }; var x int`, `x`, `var p2.x int`},
602 {`package p3; func _() { type _ x }; type x int`, `x`, `type p3.x int`},
603 {`package p4; func _() { _ = f }; func f()`, `f`, `func p4.f()`},
605 // generic types must be sanitized
606 // (need to use sufficiently nested types to provoke unexpanded types)
607 {genericPkg + `g0; func _() { _ = x }; type t[P any] P; const x = t[int](42)`, `x`, `const generic_g0.x generic_g0.t[int]`},
608 {genericPkg + `g1; func _() { _ = x }; type t[P any] P; var x = t[int](42)`, `x`, `var generic_g1.x generic_g1.t[int]`},
609 {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]}`},
610 {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]})`},
613 for _, test := range tests {
615 Uses: make(map[*syntax.Name]Object),
617 name := mustTypecheck(t, "UsesInfo", test.src, &info)
621 for id, obj := range info.Uses {
622 if id.Value == test.obj {
628 t.Errorf("package %s: %s not found", name, test.obj)
632 if got := use.String(); got != test.want {
633 t.Errorf("package %s: got %s; want %s", name, got, test.want)
638 func TestImplicitsInfo(t *testing.T) {
639 testenv.MustHaveGoBuild(t)
641 var tests = []struct {
645 {`package p2; import . "fmt"; var _ = Println`, ""}, // no Implicits entry
646 {`package p0; import local "fmt"; var _ = local.Println`, ""}, // no Implicits entry
647 {`package p1; import "fmt"; var _ = fmt.Println`, "importSpec: package fmt"},
649 {`package p3; func f(x interface{}) { switch x.(type) { case int: } }`, ""}, // no Implicits entry
650 {`package p4; func f(x interface{}) { switch t := x.(type) { case int: _ = t } }`, "caseClause: var t int"},
651 {`package p5; func f(x interface{}) { switch t := x.(type) { case int, uint: _ = t } }`, "caseClause: var t interface{}"},
652 {`package p6; func f(x interface{}) { switch t := x.(type) { default: _ = t } }`, "caseClause: var t interface{}"},
654 {`package p7; func f(x int) {}`, ""}, // no Implicits entry
655 {`package p8; func f(int) {}`, "field: var int"},
656 {`package p9; func f() (complex64) { return 0 }`, "field: var complex64"},
657 {`package p10; type T struct{}; func (*T) f() {}`, "field: var *p10.T"},
660 for _, test := range tests {
662 Implicits: make(map[syntax.Node]Object),
664 name := mustTypecheck(t, "ImplicitsInfo", test.src, &info)
666 // the test cases expect at most one Implicits entry
667 if len(info.Implicits) > 1 {
668 t.Errorf("package %s: %d Implicits entries found", name, len(info.Implicits))
672 // extract Implicits entry, if any
674 for n, obj := range info.Implicits {
675 switch x := n.(type) {
676 case *syntax.ImportDecl:
678 case *syntax.CaseClause:
683 t.Fatalf("package %s: unexpected %T", name, x)
685 got += ": " + obj.String()
689 if got != test.want {
690 t.Errorf("package %s: got %q; want %q", name, got, test.want)
695 func predString(tv TypeAndValue) string {
697 pred := func(b bool, s string) {
700 buf.WriteString(", ")
706 pred(tv.IsVoid(), "void")
707 pred(tv.IsType(), "type")
708 pred(tv.IsBuiltin(), "builtin")
709 pred(tv.IsValue() && tv.Value != nil, "const")
710 pred(tv.IsValue() && tv.Value == nil, "value")
711 pred(tv.IsNil(), "nil")
712 pred(tv.Addressable(), "addressable")
713 pred(tv.Assignable(), "assignable")
714 pred(tv.HasOk(), "hasOk")
722 func TestPredicatesInfo(t *testing.T) {
723 testenv.MustHaveGoBuild(t)
725 var tests = []struct {
731 {`package n0; func f() { f() }`, `f()`, `void`},
734 {`package t0; type _ int`, `int`, `type`},
735 {`package t1; type _ []int`, `[]int`, `type`},
736 {`package t2; type _ func()`, `func()`, `type`},
737 {`package t3; type _ func(int)`, `int`, `type`},
738 {`package t3; type _ func(...int)`, `...int`, `type`},
741 {`package b0; var _ = len("")`, `len`, `builtin`},
742 {`package b1; var _ = (len)("")`, `(len)`, `builtin`},
745 {`package c0; var _ = 42`, `42`, `const`},
746 {`package c1; var _ = "foo" + "bar"`, `"foo" + "bar"`, `const`},
747 {`package c2; const (i = 1i; _ = i)`, `i`, `const`},
750 {`package v0; var (a, b int; _ = a + b)`, `a + b`, `value`},
751 {`package v1; var _ = &[]int{1}`, `[]int{…}`, `value`},
752 {`package v2; var _ = func(){}`, `func() {}`, `value`},
753 {`package v4; func f() { _ = f }`, `f`, `value`},
754 {`package v3; var _ *int = nil`, `nil`, `value, nil`},
755 {`package v3; var _ *int = (nil)`, `(nil)`, `value, nil`},
757 // addressable (and thus assignable) operands
758 {`package a0; var (x int; _ = x)`, `x`, `value, addressable, assignable`},
759 {`package a1; var (p *int; _ = *p)`, `*p`, `value, addressable, assignable`},
760 {`package a2; var (s []int; _ = s[0])`, `s[0]`, `value, addressable, assignable`},
761 {`package a3; var (s struct{f int}; _ = s.f)`, `s.f`, `value, addressable, assignable`},
762 {`package a4; var (a [10]int; _ = a[0])`, `a[0]`, `value, addressable, assignable`},
763 {`package a5; func _(x int) { _ = x }`, `x`, `value, addressable, assignable`},
764 {`package a6; func _()(x int) { _ = x; return }`, `x`, `value, addressable, assignable`},
765 {`package a7; type T int; func (x T) _() { _ = x }`, `x`, `value, addressable, assignable`},
766 // composite literals are not addressable
768 // assignable but not addressable values
769 {`package s0; var (m map[int]int; _ = m[0])`, `m[0]`, `value, assignable, hasOk`},
770 {`package s1; var (m map[int]int; _, _ = m[0])`, `m[0]`, `value, assignable, hasOk`},
773 {`package k0; var (ch chan int; _ = <-ch)`, `<-ch`, `value, hasOk`},
774 {`package k1; var (ch chan int; _, _ = <-ch)`, `<-ch`, `value, hasOk`},
777 // - package names are collected in the Uses map
778 // - identifiers being declared are collected in the Defs map
779 {`package m0; import "os"; func _() { _ = os.Stdout }`, `os`, `<missing>`},
780 {`package m1; import p "os"; func _() { _ = p.Stdout }`, `p`, `<missing>`},
781 {`package m2; const c = 0`, `c`, `<missing>`},
782 {`package m3; type T int`, `T`, `<missing>`},
783 {`package m4; var v int`, `v`, `<missing>`},
784 {`package m5; func f() {}`, `f`, `<missing>`},
785 {`package m6; func _(x int) {}`, `x`, `<missing>`},
786 {`package m6; func _()(x int) { return }`, `x`, `<missing>`},
787 {`package m6; type T int; func (x T) _() {}`, `x`, `<missing>`},
790 for _, test := range tests {
791 info := Info{Types: make(map[syntax.Expr]TypeAndValue)}
792 name := mustTypecheck(t, "PredicatesInfo", test.src, &info)
794 // look for expression predicates
796 for e, tv := range info.Types {
797 //println(name, syntax.String(e))
798 if syntax.String(e) == test.expr {
804 if got != test.pred {
805 t.Errorf("package %s: got %s; want %s", name, got, test.pred)
810 func TestScopesInfo(t *testing.T) {
811 testenv.MustHaveGoBuild(t)
813 var tests = []struct {
815 scopes []string // list of scope descriptors of the form kind:varlist
817 {`package p0`, []string{
820 {`package p1; import ( "fmt"; m "math"; _ "os" ); var ( _ = fmt.Println; _ = m.Pi )`, []string{
823 {`package p2; func _() {}`, []string{
826 {`package p3; func _(x, y int) {}`, []string{
829 {`package p4; func _(x, y int) { x, z := 1, 2; _ = z }`, []string{
830 "file:", "func:x y z", // redeclaration of x
832 {`package p5; func _(x, y int) (u, _ int) { return }`, []string{
833 "file:", "func:u x y",
835 {`package p6; func _() { { var x int; _ = x } }`, []string{
836 "file:", "func:", "block:x",
838 {`package p7; func _() { if true {} }`, []string{
839 "file:", "func:", "if:", "block:",
841 {`package p8; func _() { if x := 0; x < 0 { y := x; _ = y } }`, []string{
842 "file:", "func:", "if:x", "block:y",
844 {`package p9; func _() { switch x := 0; x {} }`, []string{
845 "file:", "func:", "switch:x",
847 {`package p10; func _() { switch x := 0; x { case 1: y := x; _ = y; default: }}`, []string{
848 "file:", "func:", "switch:x", "case:y", "case:",
850 {`package p11; func _(t interface{}) { switch t.(type) {} }`, []string{
851 "file:", "func:t", "switch:",
853 {`package p12; func _(t interface{}) { switch t := t; t.(type) {} }`, []string{
854 "file:", "func:t", "switch:t",
856 {`package p13; func _(t interface{}) { switch x := t.(type) { case int: _ = x } }`, []string{
857 "file:", "func:t", "switch:", "case:x", // x implicitly declared
859 {`package p14; func _() { select{} }`, []string{
862 {`package p15; func _(c chan int) { select{ case <-c: } }`, []string{
863 "file:", "func:c", "comm:",
865 {`package p16; func _(c chan int) { select{ case i := <-c: x := i; _ = x} }`, []string{
866 "file:", "func:c", "comm:i x",
868 {`package p17; func _() { for{} }`, []string{
869 "file:", "func:", "for:", "block:",
871 {`package p18; func _(n int) { for i := 0; i < n; i++ { _ = i } }`, []string{
872 "file:", "func:n", "for:i", "block:",
874 {`package p19; func _(a []int) { for i := range a { _ = i} }`, []string{
875 "file:", "func:a", "for:i", "block:",
877 {`package p20; var s int; func _(a []int) { for i, x := range a { s += x; _ = i } }`, []string{
878 "file:", "func:a", "for:i x", "block:",
882 for _, test := range tests {
883 info := Info{Scopes: make(map[syntax.Node]*Scope)}
884 name := mustTypecheck(t, "ScopesInfo", test.src, &info)
886 // number of scopes must match
887 if len(info.Scopes) != len(test.scopes) {
888 t.Errorf("package %s: got %d scopes; want %d", name, len(info.Scopes), len(test.scopes))
891 // scope descriptions must match
892 for node, scope := range info.Scopes {
897 case *syntax.FuncType:
899 case *syntax.BlockStmt:
903 case *syntax.SwitchStmt:
905 case *syntax.SelectStmt:
907 case *syntax.CaseClause:
909 case *syntax.CommClause:
911 case *syntax.ForStmt:
914 kind = fmt.Sprintf("%T", node)
917 // look for matching scope description
918 desc := kind + ":" + strings.Join(scope.Names(), " ")
920 for _, d := range test.scopes {
927 t.Errorf("package %s: no matching scope found for %s", name, desc)
933 func TestInitOrderInfo(t *testing.T) {
934 var tests = []struct {
938 {`package p0; var (x = 1; y = x)`, []string{
941 {`package p1; var (a = 1; b = 2; c = 3)`, []string{
942 "a = 1", "b = 2", "c = 3",
944 {`package p2; var (a, b, c = 1, 2, 3)`, []string{
945 "a = 1", "b = 2", "c = 3",
947 {`package p3; var _ = f(); func f() int { return 1 }`, []string{
948 "_ = f()", // blank var
950 {`package p4; var (a = 0; x = y; y = z; z = 0)`, []string{
951 "a = 0", "z = 0", "y = z", "x = y",
953 {`package p5; var (a, _ = m[0]; m map[int]string)`, []string{
954 "a, _ = m[0]", // blank var
956 {`package p6; var a, b = f(); func f() (_, _ int) { return z, z }; var z = 0`, []string{
957 "z = 0", "a, b = f()",
959 {`package p7; var (a = func() int { return b }(); b = 1)`, []string{
960 "b = 1", "a = func() int {…}()",
962 {`package p8; var (a, b = func() (_, _ int) { return c, c }(); c = 1)`, []string{
963 "c = 1", "a, b = func() (_, _ int) {…}()",
965 {`package p9; type T struct{}; func (T) m() int { _ = y; return 0 }; var x, y = T.m, 1`, []string{
968 {`package p10; var (d = c + b; a = 0; b = 0; c = 0)`, []string{
969 "a = 0", "b = 0", "c = 0", "d = c + b",
971 {`package p11; var (a = e + c; b = d + c; c = 0; d = 0; e = 0)`, []string{
972 "c = 0", "d = 0", "b = d + c", "e = 0", "a = e + c",
974 // emit an initializer for n:1 initializations only once (not for each node
975 // on the lhs which may appear in different order in the dependency graph)
976 {`package p12; var (a = x; b = 0; x, y = m[0]; m map[int]int)`, []string{
977 "b = 0", "x, y = m[0]", "a = x",
979 // test case from spec section on package initialization
993 "d = 3", "b = f()", "c = f()", "a = c + b",
995 // test case for issue 7131
999 func next() int { counter++; return counter }
1002 func makeOrder() []int { return []int{f, b, d, e, c, a} }
1005 var b, c = next(), next()
1006 var d, e, f = next(), next(), next()
1008 "a = next()", "b = next()", "c = next()", "d = next()", "e = next()", "f = next()", "_ = makeOrder()",
1010 // test case for issue 10709
1020 func (T) m() int { return 0 }
1022 func makeT(n int) T {
1028 "t = makeT(0)", "v = t.m()",
1030 // test case for issue 10709: same as test before, but variable decls swapped
1040 func (T) m() int { return 0 }
1042 func makeT(n int) T {
1048 "t = makeT(0)", "v = t.m()",
1050 // another candidate possibly causing problems with issue 10709
1055 func f1() int { return g1() }
1056 func g1() int { f1(); return x1 }
1062 func f2() int { return g2() }
1063 func g2() int { return x2 }
1065 var x2 = 0`, []string{
1066 "x1 = 0", "y1 = f1()", "x2 = 0", "y2 = f2()",
1070 for _, test := range tests {
1072 name := mustTypecheck(t, "InitOrderInfo", test.src, &info)
1074 // number of initializers must match
1075 if len(info.InitOrder) != len(test.inits) {
1076 t.Errorf("package %s: got %d initializers; want %d", name, len(info.InitOrder), len(test.inits))
1080 // initializers must match
1081 for i, want := range test.inits {
1082 got := info.InitOrder[i].String()
1084 t.Errorf("package %s, init %d: got %s; want %s", name, i, got, want)
1091 func TestMultiFileInitOrder(t *testing.T) {
1092 mustParse := func(src string) *syntax.File {
1093 f, err := parseSrc("main", src)
1100 fileA := mustParse(`package main; var a = 1`)
1101 fileB := mustParse(`package main; var b = 2`)
1103 // The initialization order must not depend on the parse
1104 // order of the files, only on the presentation order to
1105 // the type-checker.
1106 for _, test := range []struct {
1107 files []*syntax.File
1110 {[]*syntax.File{fileA, fileB}, "[a = 1 b = 2]"},
1111 {[]*syntax.File{fileB, fileA}, "[b = 2 a = 1]"},
1114 if _, err := new(Config).Check("main", test.files, &info); err != nil {
1117 if got := fmt.Sprint(info.InitOrder); got != test.want {
1118 t.Fatalf("got %s; want %s", got, test.want)
1123 func TestFiles(t *testing.T) {
1124 var sources = []string{
1125 "package p; type T struct{}; func (T) m1() {}",
1126 "package p; func (T) m2() {}; var x interface{ m1(); m2() } = T{}",
1127 "package p; func (T) m3() {}; var y interface{ m1(); m2(); m3() } = T{}",
1132 pkg := NewPackage("p", "p")
1134 check := NewChecker(&conf, pkg, &info)
1136 for i, src := range sources {
1137 filename := fmt.Sprintf("sources%d", i)
1138 f, err := parseSrc(filename, src)
1142 if err := check.Files([]*syntax.File{f}); err != nil {
1147 // check InitOrder is [x y]
1149 for _, init := range info.InitOrder {
1150 for _, v := range init.Lhs {
1151 vars = append(vars, v.Name())
1154 if got, want := fmt.Sprint(vars), "[x y]"; got != want {
1155 t.Errorf("InitOrder == %s, want %s", got, want)
1159 type testImporter map[string]*Package
1161 func (m testImporter) Import(path string) (*Package, error) {
1162 if pkg := m[path]; pkg != nil {
1165 return nil, fmt.Errorf("package %q not found", path)
1168 func TestSelection(t *testing.T) {
1169 selections := make(map[*syntax.SelectorExpr]*Selection)
1171 imports := make(testImporter)
1172 conf := Config{Importer: imports}
1173 makePkg := func(path, src string) {
1174 f, err := parseSrc(path+".go", src)
1178 pkg, err := conf.Check(path, []*syntax.File{f}, &Info{Selections: selections})
1216 // qualified identifiers
1250 // method expressions
1257 wantOut := map[string][2]string{
1258 "lib.T.M": {"method expr (lib.T) M(lib.T)", ".[0]"},
1260 "A{}.B": {"field (main.A) B *main.B", ".[0]"},
1261 "new(A).B": {"field (*main.A) B *main.B", "->[0]"},
1262 "A{}.C": {"field (main.A) C main.C", ".[1]"},
1263 "new(A).C": {"field (*main.A) C main.C", "->[1]"},
1264 "A{}.b": {"field (main.A) b int", "->[0 0]"},
1265 "new(A).b": {"field (*main.A) b int", "->[0 0]"},
1266 "A{}.c": {"field (main.A) c int", ".[1 0]"},
1267 "new(A).c": {"field (*main.A) c int", "->[1 0]"},
1269 "A{}.f": {"method (main.A) f(int)", "->[0 0]"},
1270 "new(A).f": {"method (*main.A) f(int)", "->[0 0]"},
1271 "A{}.g": {"method (main.A) g()", ".[1 0]"},
1272 "new(A).g": {"method (*main.A) g()", "->[1 0]"},
1273 "new(A).h": {"method (*main.A) h()", "->[1 1]"}, // TODO(gri) should this report .[1 1] ?
1274 "B{}.f": {"method (main.B) f(int)", ".[0]"},
1275 "new(B).f": {"method (*main.B) f(int)", "->[0]"},
1276 "C{}.g": {"method (main.C) g()", ".[0]"},
1277 "new(C).g": {"method (*main.C) g()", "->[0]"},
1278 "new(C).h": {"method (*main.C) h()", "->[1]"}, // TODO(gri) should this report .[1] ?
1280 "A.f": {"method expr (main.A) f(main.A, int)", "->[0 0]"},
1281 "(*A).f": {"method expr (*main.A) f(*main.A, int)", "->[0 0]"},
1282 "B.f": {"method expr (main.B) f(main.B, int)", ".[0]"},
1283 "(*B).f": {"method expr (*main.B) f(*main.B, int)", "->[0]"},
1286 makePkg("lib", libSrc)
1287 makePkg("main", mainSrc)
1289 for e, sel := range selections {
1290 _ = sel.String() // assertion: must not panic
1292 start := indexFor(mainSrc, syntax.StartPos(e))
1293 end := indexFor(mainSrc, syntax.EndPos(e))
1294 segment := mainSrc[start:end] // (all SelectorExprs are in main, not lib)
1302 fmt.Sprintf("%s%v", direct, sel.Index()),
1304 want := wantOut[segment]
1306 t.Errorf("%s: got %q; want %q", segment, got, want)
1308 delete(wantOut, segment)
1310 // We must explicitly assert properties of the
1311 // Signature's receiver since it doesn't participate
1312 // in Identical() or String().
1313 sig, _ := sel.Type().(*Signature)
1314 if sel.Kind() == MethodVal {
1315 got := sig.Recv().Type()
1317 if !Identical(got, want) {
1318 t.Errorf("%s: Recv() = %s, want %s", segment, got, want)
1320 } else if sig != nil && sig.Recv() != nil {
1321 t.Errorf("%s: signature has receiver %s", sig, sig.Recv().Type())
1324 // Assert that all wantOut entries were used exactly once.
1325 for segment := range wantOut {
1326 t.Errorf("no syntax.Selection found with syntax %q", segment)
1330 // indexFor returns the index into s corresponding to the position pos.
1331 func indexFor(s string, pos syntax.Pos) int {
1332 i, line := 0, 1 // string index and corresponding line
1333 target := int(pos.Line())
1334 for line < target && i < len(s) {
1340 return i + int(pos.Col()-1) // columns are 1-based
1343 func TestIssue8518(t *testing.T) {
1344 imports := make(testImporter)
1346 Error: func(err error) { t.Log(err) }, // don't exit after first error
1349 makePkg := func(path, src string) {
1350 f, err := parseSrc(path, src)
1354 pkg, _ := conf.Check(path, []*syntax.File{f}, nil) // errors logged via conf.Error
1362 const C2 = missing.C
1372 makePkg("a", libSrc)
1373 makePkg("main", mainSrc) // don't crash when type-checking this package
1376 func TestLookupFieldOrMethod(t *testing.T) {
1377 // Test cases assume a lookup of the form a.f or x.f, where a stands for an
1378 // addressable value, and x for a non-addressable value (even though a variable
1379 // for ease of test case writing).
1380 var tests = []struct {
1387 {"var x T; type T struct{}", false, nil, false},
1388 {"var x T; type T struct{ f int }", true, []int{0}, false},
1389 {"var x T; type T struct{ a, b, f, c int }", true, []int{2}, false},
1392 {"var a T; type T struct{}; func (T) f() {}", true, []int{0}, false},
1393 {"var a *T; type T struct{}; func (T) f() {}", true, []int{0}, true},
1394 {"var a T; type T struct{}; func (*T) f() {}", true, []int{0}, false},
1395 {"var a *T; type T struct{}; func (*T) f() {}", true, []int{0}, true}, // TODO(gri) should this report indirect = false?
1398 {"type ( E1 struct{ f int }; E2 struct{ f int }; x struct{ E1; *E2 })", false, []int{1, 0}, false},
1399 {"type ( E1 struct{ f int }; E2 struct{}; x struct{ E1; *E2 }); func (E2) f() {}", false, []int{1, 0}, false},
1401 // outside methodset
1402 // (*T).f method exists, but value of type T is not addressable
1403 {"var x T; type T struct{}; func (*T) f() {}", false, nil, true},
1406 for _, test := range tests {
1407 pkg, err := pkgFor("test", "package p;"+test.src, nil)
1409 t.Errorf("%s: incorrect test case: %s", test.src, err)
1413 obj := pkg.Scope().Lookup("a")
1415 if obj = pkg.Scope().Lookup("x"); obj == nil {
1416 t.Errorf("%s: incorrect test case - no object a or x", test.src)
1421 f, index, indirect := LookupFieldOrMethod(obj.Type(), obj.Name() == "a", pkg, "f")
1422 if (f != nil) != test.found {
1424 t.Errorf("%s: got no object; want one", test.src)
1426 t.Errorf("%s: got object = %v; want none", test.src, f)
1429 if !sameSlice(index, test.index) {
1430 t.Errorf("%s: got index = %v; want %v", test.src, index, test.index)
1432 if indirect != test.indirect {
1433 t.Errorf("%s: got indirect = %v; want %v", test.src, indirect, test.indirect)
1438 func sameSlice(a, b []int) bool {
1439 if len(a) != len(b) {
1442 for i, x := range a {
1450 // TestScopeLookupParent ensures that (*Scope).LookupParent returns
1451 // the correct result at various positions within the source.
1452 func TestScopeLookupParent(t *testing.T) {
1453 imports := make(testImporter)
1454 conf := Config{Importer: imports}
1456 makePkg := func(path, src string) {
1457 f, err := parseSrc(path, src)
1461 imports[path], err = conf.Check(path, []*syntax.File{f}, &info)
1467 makePkg("lib", "package lib; var X int")
1468 // Each /*name=kind:line*/ comment makes the test look up the
1469 // name at that point and checks that it resolves to a decl of
1470 // the specified kind and line number. "undef" means undefined.
1472 /*lib=pkgname:5*/ /*X=var:1*/ /*Pi=const:8*/ /*T=typename:9*/ /*Y=var:10*/ /*F=func:12*/
1483 const pi, e = 3.1415, /*pi=undef*/ 2.71828 /*pi=const:13*/ /*e=const:13*/
1484 type /*t=undef*/ t /*t=typename:14*/ *t
1485 print(Y) /*Y=var:10*/
1486 x, Y := Y, /*x=undef*/ /*Y=var:10*/ Pi /*x=var:16*/ /*Y=var:16*/ ; _ = x; _ = Y
1487 var F = /*F=func:12*/ F /*F=var:17*/ ; _ = F
1490 for i, x := range /*i=undef*/ /*x=var:16*/ a /*i=var:20*/ /*x=var:20*/ { _ = i; _ = x }
1493 switch y := i.(type) { /*y=undef*/
1494 case /*y=undef*/ int /*y=var:23*/ :
1495 case float32, /*y=undef*/ float64 /*y=var:23*/ :
1496 default /*y=var:23*/:
1501 switch int := i.(type) {
1502 case /*int=typename:0*/ int /*int=var:31*/ :
1504 default /*int=var:31*/ :
1510 info.Uses = make(map[*syntax.Name]Object)
1511 makePkg("main", mainSrc)
1512 mainScope := imports["main"].Scope()
1514 rx := regexp.MustCompile(`^/\*(\w*)=([\w:]*)\*/$`)
1516 base := syntax.NewFileBase("main")
1517 syntax.CommentsDo(strings.NewReader(mainSrc), func(line, col uint, text string) {
1518 pos := syntax.MakePos(base, line, col)
1520 // Syntax errors are not comments.
1522 t.Errorf("%s: %s", pos, text)
1526 // Parse the assertion in the comment.
1527 m := rx.FindStringSubmatch(text)
1529 t.Errorf("%s: bad comment: %s", pos, text)
1532 name, want := m[1], m[2]
1534 // Look up the name in the innermost enclosing scope.
1535 inner := mainScope.Innermost(pos)
1537 t.Errorf("%s: at %s: can't find innermost scope", pos, text)
1541 if _, obj := inner.LookupParent(name, pos); obj != nil {
1542 kind := strings.ToLower(strings.TrimPrefix(reflect.TypeOf(obj).String(), "*types2."))
1543 got = fmt.Sprintf("%s:%d", kind, obj.Pos().Line())
1546 t.Errorf("%s: at %s: %s resolved to %s, want %s", pos, text, name, got, want)
1550 // Check that for each referring identifier,
1551 // a lookup of its name on the innermost
1552 // enclosing scope returns the correct object.
1554 for id, wantObj := range info.Uses {
1555 inner := mainScope.Innermost(id.Pos())
1557 t.Errorf("%s: can't find innermost scope enclosing %q", id.Pos(), id.Value)
1561 // Exclude selectors and qualified identifiers---lexical
1562 // refs only. (Ideally, we'd see if the AST parent is a
1563 // SelectorExpr, but that requires PathEnclosingInterval
1564 // from golang.org/x/tools/go/ast/astutil.)
1565 if id.Value == "X" {
1569 _, gotObj := inner.LookupParent(id.Value, id.Pos())
1570 if gotObj != wantObj {
1571 t.Errorf("%s: got %v, want %v", id.Pos(), gotObj, wantObj)
1577 var nopos syntax.Pos
1579 // newDefined creates a new defined type named T with the given underlying type.
1580 func newDefined(underlying Type) *Named {
1581 tname := NewTypeName(nopos, nil, "T", nil)
1582 return NewNamed(tname, underlying, nil)
1585 func TestConvertibleTo(t *testing.T) {
1586 for _, test := range []struct {
1590 {Typ[Int], Typ[Int], true},
1591 {Typ[Int], Typ[Float32], true},
1592 {newDefined(Typ[Int]), Typ[Int], true},
1593 {newDefined(new(Struct)), new(Struct), true},
1594 {newDefined(Typ[Int]), new(Struct), false},
1595 {Typ[UntypedInt], Typ[Int], true},
1596 {NewSlice(Typ[Int]), NewPointer(NewArray(Typ[Int], 10)), true},
1597 {NewSlice(Typ[Int]), NewArray(Typ[Int], 10), false},
1598 {NewSlice(Typ[Int]), NewPointer(NewArray(Typ[Uint], 10)), false},
1599 // Untyped string values are not permitted by the spec, so the below
1600 // behavior is undefined.
1601 {Typ[UntypedString], Typ[String], true},
1603 if got := ConvertibleTo(test.v, test.t); got != test.want {
1604 t.Errorf("ConvertibleTo(%v, %v) = %t, want %t", test.v, test.t, got, test.want)
1609 func TestAssignableTo(t *testing.T) {
1610 for _, test := range []struct {
1614 {Typ[Int], Typ[Int], true},
1615 {Typ[Int], Typ[Float32], false},
1616 {newDefined(Typ[Int]), Typ[Int], false},
1617 {newDefined(new(Struct)), new(Struct), true},
1618 {Typ[UntypedBool], Typ[Bool], true},
1619 {Typ[UntypedString], Typ[Bool], false},
1620 // Neither untyped string nor untyped numeric assignments arise during
1621 // normal type checking, so the below behavior is technically undefined by
1623 {Typ[UntypedString], Typ[String], true},
1624 {Typ[UntypedInt], Typ[Int], true},
1626 if got := AssignableTo(test.v, test.t); got != test.want {
1627 t.Errorf("AssignableTo(%v, %v) = %t, want %t", test.v, test.t, got, test.want)
1632 func TestIdentical_issue15173(t *testing.T) {
1633 // Identical should allow nil arguments and be symmetric.
1634 for _, test := range []struct {
1638 {Typ[Int], Typ[Int], true},
1639 {Typ[Int], nil, false},
1640 {nil, Typ[Int], false},
1643 if got := Identical(test.x, test.y); got != test.want {
1644 t.Errorf("Identical(%v, %v) = %t", test.x, test.y, got)
1649 func TestIdenticalUnions(t *testing.T) {
1650 tname := NewTypeName(nopos, nil, "myInt", nil)
1651 myInt := NewNamed(tname, Typ[Int], nil)
1652 tmap := map[string]*Term{
1653 "int": NewTerm(false, Typ[Int]),
1654 "~int": NewTerm(true, Typ[Int]),
1655 "string": NewTerm(false, Typ[String]),
1656 "~string": NewTerm(true, Typ[String]),
1657 "myInt": NewTerm(false, myInt),
1659 makeUnion := func(s string) *Union {
1660 parts := strings.Split(s, "|")
1662 for _, p := range parts {
1665 t.Fatalf("missing term %q", p)
1667 terms = append(terms, term)
1669 return NewUnion(terms)
1671 for _, test := range []struct {
1675 // These tests are just sanity checks. The tests for type sets and
1676 // interfaces provide much more test coverage.
1677 {"int|~int", "~int", true},
1678 {"myInt|~int", "~int", true},
1679 {"int|string", "string|int", true},
1680 {"int|int|string", "string|int", true},
1681 {"myInt|string", "int|string", false},
1683 x := makeUnion(test.x)
1684 y := makeUnion(test.y)
1685 if got := Identical(x, y); got != test.want {
1686 t.Errorf("Identical(%v, %v) = %t", test.x, test.y, got)
1691 func TestIssue15305(t *testing.T) {
1692 const src = "package p; func f() int16; var _ = f(undef)"
1693 f, err := parseSrc("issue15305.go", src)
1698 Error: func(err error) {}, // allow errors
1701 Types: make(map[syntax.Expr]TypeAndValue),
1703 conf.Check("p", []*syntax.File{f}, info) // ignore result
1704 for e, tv := range info.Types {
1705 if _, ok := e.(*syntax.CallExpr); ok {
1706 if tv.Type != Typ[Int16] {
1707 t.Errorf("CallExpr has type %v, want int16", tv.Type)
1712 t.Errorf("CallExpr has no type")
1715 // TestCompositeLitTypes verifies that Info.Types registers the correct
1716 // types for composite literal expressions and composite literal type
1718 func TestCompositeLitTypes(t *testing.T) {
1719 for _, test := range []struct {
1722 {`[16]byte{}`, `[16]byte`},
1723 {`[...]byte{}`, `[0]byte`}, // test for issue #14092
1724 {`[...]int{1, 2, 3}`, `[3]int`}, // test for issue #14092
1725 {`[...]int{90: 0, 98: 1, 2}`, `[100]int`}, // test for issue #14092
1726 {`[]int{}`, `[]int`},
1727 {`map[string]bool{"foo": true}`, `map[string]bool`},
1728 {`struct{}{}`, `struct{}`},
1729 {`struct{x, y int; z complex128}{}`, `struct{x int; y int; z complex128}`},
1731 f, err := parseSrc(test.lit, "package p; var _ = "+test.lit)
1733 t.Fatalf("%s: %v", test.lit, err)
1737 Types: make(map[syntax.Expr]TypeAndValue),
1739 if _, err = new(Config).Check("p", []*syntax.File{f}, info); err != nil {
1740 t.Fatalf("%s: %v", test.lit, err)
1743 cmptype := func(x syntax.Expr, want string) {
1744 tv, ok := info.Types[x]
1746 t.Errorf("%s: no Types entry found", test.lit)
1750 t.Errorf("%s: type is nil", test.lit)
1753 if got := tv.Type.String(); got != want {
1754 t.Errorf("%s: got %v, want %s", test.lit, got, want)
1758 // test type of composite literal expression
1759 rhs := f.DeclList[0].(*syntax.VarDecl).Values
1760 cmptype(rhs, test.typ)
1762 // test type of composite literal type expression
1763 cmptype(rhs.(*syntax.CompositeLit).Type, test.typ)
1767 // TestObjectParents verifies that objects have parent scopes or not
1768 // as specified by the Object interface.
1769 func TestObjectParents(t *testing.T) {
1788 func f(x int) { y := x; print(y) }
1791 f, err := parseSrc("src", src)
1797 Defs: make(map[*syntax.Name]Object),
1799 if _, err = new(Config).Check("p", []*syntax.File{f}, info); err != nil {
1803 for ident, obj := range info.Defs {
1805 // only package names and implicit vars have a nil object
1806 // (in this test we only need to handle the package name)
1807 if ident.Value != "p" {
1808 t.Errorf("%v has nil object", ident)
1813 // struct fields, type-associated and interface methods
1814 // have no parent scope
1816 switch obj := obj.(type) {
1822 if obj.Type().(*Signature).Recv() != nil { // method
1827 gotParent := obj.Parent() != nil
1829 case gotParent && !wantParent:
1830 t.Errorf("%v: want no parent, got %s", ident, obj.Parent())
1831 case !gotParent && wantParent:
1832 t.Errorf("%v: no parent found", ident)
1837 // TestFailedImport tests that we don't get follow-on errors
1838 // elsewhere in a package due to failing to import a package.
1839 func TestFailedImport(t *testing.T) {
1840 testenv.MustHaveGoBuild(t)
1845 import foo "go/types/thisdirectorymustnotexistotherwisethistestmayfail/foo" // should only see an error here
1850 func f(x T) T { return foo.F(x) }
1852 f, err := parseSrc("src", src)
1856 files := []*syntax.File{f}
1858 // type-check using all possible importers
1859 for _, compiler := range []string{"gc", "gccgo", "source"} {
1862 Error: func(err error) {
1863 // we should only see the import error
1864 if errcount > 0 || !strings.Contains(err.Error(), "could not import") {
1865 t.Errorf("for %s importer, got unexpected error: %v", compiler, err)
1869 //Importer: importer.For(compiler, nil),
1873 Uses: make(map[*syntax.Name]Object),
1875 pkg, _ := conf.Check("p", files, info)
1877 t.Errorf("for %s importer, type-checking failed to return a package", compiler)
1881 imports := pkg.Imports()
1882 if len(imports) != 1 {
1883 t.Errorf("for %s importer, got %d imports, want 1", compiler, len(imports))
1887 if imp.Name() != "foo" {
1888 t.Errorf(`for %s importer, got %q, want "foo"`, compiler, imp.Name())
1892 // verify that all uses of foo refer to the imported package foo (imp)
1893 for ident, obj := range info.Uses {
1894 if ident.Value == "foo" {
1895 if obj, ok := obj.(*PkgName); ok {
1896 if obj.Imported() != imp {
1897 t.Errorf("%s resolved to %v; want %v", ident.Value, obj.Imported(), imp)
1900 t.Errorf("%s resolved to %v; want package name", ident.Value, obj)
1907 func TestInstantiate(t *testing.T) {
1908 // eventually we like more tests but this is a start
1909 const src = genericPkg + "p; type T[P any] *T[P]"
1910 pkg, err := pkgFor(".", src, nil)
1915 // type T should have one type parameter
1916 T := pkg.Scope().Lookup("T").Type().(*Named)
1917 if n := T.TypeParams().Len(); n != 1 {
1918 t.Fatalf("expected 1 type parameter; found %d", n)
1921 // instantiation should succeed (no endless recursion)
1922 // even with a nil *Checker
1923 res, err := Instantiate(nil, T, []Type{Typ[Int]}, false)
1928 // instantiated type should point to itself
1929 if p := res.Underlying().(*Pointer).Elem(); p != res {
1930 t.Fatalf("unexpected result type: %s points to %s", res, p)
1934 func TestInstantiateErrors(t *testing.T) {
1936 src string // by convention, T must be the type being instantiated
1938 wantAt int // -1 indicates no error
1940 {"type T[P interface{~string}] int", []Type{Typ[Int]}, 0},
1941 {"type T[P1 interface{int}, P2 interface{~string}] int", []Type{Typ[Int], Typ[Int]}, 1},
1942 {"type T[P1 any, P2 interface{~[]P1}] int", []Type{Typ[Int], NewSlice(Typ[String])}, 1},
1943 {"type T[P1 interface{~[]P2}, P2 any] int", []Type{NewSlice(Typ[String]), Typ[Int]}, 0},
1946 for _, test := range tests {
1947 src := genericPkg + "p; " + test.src
1948 pkg, err := pkgFor(".", src, nil)
1953 T := pkg.Scope().Lookup("T").Type().(*Named)
1955 _, err = Instantiate(nil, T, test.targs, true)
1957 t.Fatalf("Instantiate(%v, %v) returned nil error, want non-nil", T, test.targs)
1960 gotAt := err.(ArgumentError).Index()
1961 if gotAt != test.wantAt {
1962 t.Errorf("Instantate(%v, %v): error at index %d, want index %d", T, test.targs, gotAt, test.wantAt)
1967 func TestInstanceIdentity(t *testing.T) {
1968 imports := make(testImporter)
1969 conf := Config{Importer: imports}
1970 makePkg := func(src string) {
1971 f, err := parseSrc("", src)
1975 name := f.PkgName.Value
1976 pkg, err := conf.Check(name, []*syntax.File{f}, nil)
1982 makePkg(genericPkg + `lib; type T[P any] struct{}`)
1983 makePkg(genericPkg + `a; import "generic_lib"; var A generic_lib.T[int]`)
1984 makePkg(genericPkg + `b; import "generic_lib"; var B generic_lib.T[int]`)
1985 a := imports["generic_a"].Scope().Lookup("A")
1986 b := imports["generic_b"].Scope().Lookup("B")
1987 if !Identical(a.Type(), b.Type()) {
1988 t.Errorf("mismatching types: a.A: %s, b.B: %s", a.Type(), b.Type())