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.
8 "cmd/compile/internal/syntax"
18 . "cmd/compile/internal/types2"
21 // nopos indicates an unknown position
24 func parse(path, src string) (*syntax.File, error) {
25 errh := func(error) {} // dummy error handler so that parsing continues in presence of errors
26 return syntax.Parse(syntax.NewFileBase(path), strings.NewReader(src), errh, nil, 0)
29 func mustParse(path, src string) *syntax.File {
30 f, err := parse(path, src)
32 panic(err) // so we don't need to pass *testing.T
37 func typecheck(path, src string, conf *Config, info *Info) (*Package, error) {
38 f, err := parse(path, src)
39 if f == nil { // ignore errors unless f is nil
44 Error: func(err error) {}, // collect all errors
45 Importer: defaultImporter(),
48 return conf.Check(f.PkgName.Value, []*syntax.File{f}, info)
51 func mustTypecheck(path, src string, conf *Config, info *Info) *Package {
52 pkg, err := typecheck(path, src, conf, info)
54 panic(err) // so we don't need to pass *testing.T
59 func TestValuesInfo(t *testing.T) {
60 var tests = []struct {
62 expr string // constant expression
63 typ string // constant type
64 val string // constant value
66 {`package a0; const _ = false`, `false`, `untyped bool`, `false`},
67 {`package a1; const _ = 0`, `0`, `untyped int`, `0`},
68 {`package a2; const _ = 'A'`, `'A'`, `untyped rune`, `65`},
69 {`package a3; const _ = 0.`, `0.`, `untyped float`, `0`},
70 {`package a4; const _ = 0i`, `0i`, `untyped complex`, `(0 + 0i)`},
71 {`package a5; const _ = "foo"`, `"foo"`, `untyped string`, `"foo"`},
73 {`package b0; var _ = false`, `false`, `bool`, `false`},
74 {`package b1; var _ = 0`, `0`, `int`, `0`},
75 {`package b2; var _ = 'A'`, `'A'`, `rune`, `65`},
76 {`package b3; var _ = 0.`, `0.`, `float64`, `0`},
77 {`package b4; var _ = 0i`, `0i`, `complex128`, `(0 + 0i)`},
78 {`package b5; var _ = "foo"`, `"foo"`, `string`, `"foo"`},
80 {`package c0a; var _ = bool(false)`, `false`, `bool`, `false`},
81 {`package c0b; var _ = bool(false)`, `bool(false)`, `bool`, `false`},
82 {`package c0c; type T bool; var _ = T(false)`, `T(false)`, `c0c.T`, `false`},
84 {`package c1a; var _ = int(0)`, `0`, `int`, `0`},
85 {`package c1b; var _ = int(0)`, `int(0)`, `int`, `0`},
86 {`package c1c; type T int; var _ = T(0)`, `T(0)`, `c1c.T`, `0`},
88 {`package c2a; var _ = rune('A')`, `'A'`, `rune`, `65`},
89 {`package c2b; var _ = rune('A')`, `rune('A')`, `rune`, `65`},
90 {`package c2c; type T rune; var _ = T('A')`, `T('A')`, `c2c.T`, `65`},
92 {`package c3a; var _ = float32(0.)`, `0.`, `float32`, `0`},
93 {`package c3b; var _ = float32(0.)`, `float32(0.)`, `float32`, `0`},
94 {`package c3c; type T float32; var _ = T(0.)`, `T(0.)`, `c3c.T`, `0`},
96 {`package c4a; var _ = complex64(0i)`, `0i`, `complex64`, `(0 + 0i)`},
97 {`package c4b; var _ = complex64(0i)`, `complex64(0i)`, `complex64`, `(0 + 0i)`},
98 {`package c4c; type T complex64; var _ = T(0i)`, `T(0i)`, `c4c.T`, `(0 + 0i)`},
100 {`package c5a; var _ = string("foo")`, `"foo"`, `string`, `"foo"`},
101 {`package c5b; var _ = string("foo")`, `string("foo")`, `string`, `"foo"`},
102 {`package c5c; type T string; var _ = T("foo")`, `T("foo")`, `c5c.T`, `"foo"`},
103 {`package c5d; var _ = string(65)`, `65`, `untyped int`, `65`},
104 {`package c5e; var _ = string('A')`, `'A'`, `untyped rune`, `65`},
105 {`package c5f; type T string; var _ = T('A')`, `'A'`, `untyped rune`, `65`},
107 {`package d0; var _ = []byte("foo")`, `"foo"`, `string`, `"foo"`},
108 {`package d1; var _ = []byte(string("foo"))`, `"foo"`, `string`, `"foo"`},
109 {`package d2; var _ = []byte(string("foo"))`, `string("foo")`, `string`, `"foo"`},
110 {`package d3; type T []byte; var _ = T("foo")`, `"foo"`, `string`, `"foo"`},
112 {`package e0; const _ = float32( 1e-200)`, `float32(1e-200)`, `float32`, `0`},
113 {`package e1; const _ = float32(-1e-200)`, `float32(-1e-200)`, `float32`, `0`},
114 {`package e2; const _ = float64( 1e-2000)`, `float64(1e-2000)`, `float64`, `0`},
115 {`package e3; const _ = float64(-1e-2000)`, `float64(-1e-2000)`, `float64`, `0`},
116 {`package e4; const _ = complex64( 1e-200)`, `complex64(1e-200)`, `complex64`, `(0 + 0i)`},
117 {`package e5; const _ = complex64(-1e-200)`, `complex64(-1e-200)`, `complex64`, `(0 + 0i)`},
118 {`package e6; const _ = complex128( 1e-2000)`, `complex128(1e-2000)`, `complex128`, `(0 + 0i)`},
119 {`package e7; const _ = complex128(-1e-2000)`, `complex128(-1e-2000)`, `complex128`, `(0 + 0i)`},
121 {`package f0 ; var _ float32 = 1e-200`, `1e-200`, `float32`, `0`},
122 {`package f1 ; var _ float32 = -1e-200`, `-1e-200`, `float32`, `0`},
123 {`package f2a; var _ float64 = 1e-2000`, `1e-2000`, `float64`, `0`},
124 {`package f3a; var _ float64 = -1e-2000`, `-1e-2000`, `float64`, `0`},
125 {`package f2b; var _ = 1e-2000`, `1e-2000`, `float64`, `0`},
126 {`package f3b; var _ = -1e-2000`, `-1e-2000`, `float64`, `0`},
127 {`package f4 ; var _ complex64 = 1e-200 `, `1e-200`, `complex64`, `(0 + 0i)`},
128 {`package f5 ; var _ complex64 = -1e-200 `, `-1e-200`, `complex64`, `(0 + 0i)`},
129 {`package f6a; var _ complex128 = 1e-2000i`, `1e-2000i`, `complex128`, `(0 + 0i)`},
130 {`package f7a; var _ complex128 = -1e-2000i`, `-1e-2000i`, `complex128`, `(0 + 0i)`},
131 {`package f6b; var _ = 1e-2000i`, `1e-2000i`, `complex128`, `(0 + 0i)`},
132 {`package f7b; var _ = -1e-2000i`, `-1e-2000i`, `complex128`, `(0 + 0i)`},
134 {`package g0; const (a = len([iota]int{}); b; c); const _ = c`, `c`, `int`, `2`}, // go.dev/issue/22341
135 {`package g1; var(j int32; s int; n = 1.0<<s == j)`, `1.0`, `int32`, `1`}, // go.dev/issue/48422
138 for _, test := range tests {
140 Types: make(map[syntax.Expr]TypeAndValue),
142 name := mustTypecheck("ValuesInfo", test.src, nil, &info).Name()
144 // look for expression
146 for e := range info.Types {
147 if syntax.String(e) == test.expr {
153 t.Errorf("package %s: no expression found for %s", name, test.expr)
156 tv := info.Types[expr]
158 // check that type is correct
159 if got := tv.Type.String(); got != test.typ {
160 t.Errorf("package %s: got type %s; want %s", name, got, test.typ)
164 // if we have a constant, check that value is correct
166 if got := tv.Value.ExactString(); got != test.val {
167 t.Errorf("package %s: got value %s; want %s", name, got, test.val)
171 t.Errorf("package %s: no constant found; want %s", name, test.val)
177 func TestTypesInfo(t *testing.T) {
178 // Test sources that are not expected to typecheck must start with the broken prefix.
179 const brokenPkg = "package broken_"
181 var tests = []struct {
183 expr string // expression
184 typ string // value type
186 // single-valued expressions of untyped constants
187 {`package b0; var x interface{} = false`, `false`, `bool`},
188 {`package b1; var x interface{} = 0`, `0`, `int`},
189 {`package b2; var x interface{} = 0.`, `0.`, `float64`},
190 {`package b3; var x interface{} = 0i`, `0i`, `complex128`},
191 {`package b4; var x interface{} = "foo"`, `"foo"`, `string`},
194 {`package n0; var _ *int = nil`, `nil`, `*int`},
195 {`package n1; var _ func() = nil`, `nil`, `func()`},
196 {`package n2; var _ []byte = nil`, `nil`, `[]byte`},
197 {`package n3; var _ map[int]int = nil`, `nil`, `map[int]int`},
198 {`package n4; var _ chan int = nil`, `nil`, `chan int`},
199 {`package n5a; var _ interface{} = (*int)(nil)`, `nil`, `*int`},
200 {`package n5b; var _ interface{m()} = nil`, `nil`, `interface{m()}`},
201 {`package n6; import "unsafe"; var _ unsafe.Pointer = nil`, `nil`, `unsafe.Pointer`},
203 {`package n10; var (x *int; _ = x == nil)`, `nil`, `*int`},
204 {`package n11; var (x func(); _ = x == nil)`, `nil`, `func()`},
205 {`package n12; var (x []byte; _ = x == nil)`, `nil`, `[]byte`},
206 {`package n13; var (x map[int]int; _ = x == nil)`, `nil`, `map[int]int`},
207 {`package n14; var (x chan int; _ = x == nil)`, `nil`, `chan int`},
208 {`package n15a; var (x interface{}; _ = x == (*int)(nil))`, `nil`, `*int`},
209 {`package n15b; var (x interface{m()}; _ = x == nil)`, `nil`, `interface{m()}`},
210 {`package n15; import "unsafe"; var (x unsafe.Pointer; _ = x == nil)`, `nil`, `unsafe.Pointer`},
212 {`package n20; var _ = (*int)(nil)`, `nil`, `*int`},
213 {`package n21; var _ = (func())(nil)`, `nil`, `func()`},
214 {`package n22; var _ = ([]byte)(nil)`, `nil`, `[]byte`},
215 {`package n23; var _ = (map[int]int)(nil)`, `nil`, `map[int]int`},
216 {`package n24; var _ = (chan int)(nil)`, `nil`, `chan int`},
217 {`package n25a; var _ = (interface{})((*int)(nil))`, `nil`, `*int`},
218 {`package n25b; var _ = (interface{m()})(nil)`, `nil`, `interface{m()}`},
219 {`package n26; import "unsafe"; var _ = unsafe.Pointer(nil)`, `nil`, `unsafe.Pointer`},
221 {`package n30; func f(*int) { f(nil) }`, `nil`, `*int`},
222 {`package n31; func f(func()) { f(nil) }`, `nil`, `func()`},
223 {`package n32; func f([]byte) { f(nil) }`, `nil`, `[]byte`},
224 {`package n33; func f(map[int]int) { f(nil) }`, `nil`, `map[int]int`},
225 {`package n34; func f(chan int) { f(nil) }`, `nil`, `chan int`},
226 {`package n35a; func f(interface{}) { f((*int)(nil)) }`, `nil`, `*int`},
227 {`package n35b; func f(interface{m()}) { f(nil) }`, `nil`, `interface{m()}`},
228 {`package n35; import "unsafe"; func f(unsafe.Pointer) { f(nil) }`, `nil`, `unsafe.Pointer`},
230 // comma-ok expressions
231 {`package p0; var x interface{}; var _, _ = x.(int)`,
235 {`package p1; var x interface{}; func _() { _, _ = x.(int) }`,
239 {`package p2a; type mybool bool; var m map[string]complex128; var b mybool; func _() { _, b = m["foo"] }`,
241 `(complex128, p2a.mybool)`,
243 {`package p2b; var m map[string]complex128; var b bool; func _() { _, b = m["foo"] }`,
245 `(complex128, bool)`,
247 {`package p3; var c chan string; var _, _ = <-c`,
253 {`package issue6796_a; var x interface{}; var _, _ = (x.(int))`,
257 {`package issue6796_b; var c chan string; var _, _ = (<-c)`,
261 {`package issue6796_c; var c chan string; var _, _ = (<-c)`,
265 {`package issue6796_d; var c chan string; var _, _ = ((<-c))`,
269 {`package issue6796_e; func f(c chan string) { _, _ = ((<-c)) }`,
275 {`package issue7060_a; var ( m map[int]string; x, ok = m[0] )`,
279 {`package issue7060_b; var ( m map[int]string; x, ok interface{} = m[0] )`,
283 {`package issue7060_c; func f(x interface{}, ok bool, m map[int]string) { x, ok = m[0] }`,
287 {`package issue7060_d; var ( ch chan string; x, ok = <-ch )`,
291 {`package issue7060_e; var ( ch chan string; x, ok interface{} = <-ch )`,
295 {`package issue7060_f; func f(x interface{}, ok bool, ch chan string) { x, ok = <-ch }`,
300 // go.dev/issue/28277
301 {`package issue28277_a; func f(...int)`,
305 {`package issue28277_b; func f(a, b int, c ...[]struct{})`,
310 // go.dev/issue/47243
311 {`package issue47243_a; var x int32; var _ = x << 3`, `3`, `untyped int`},
312 {`package issue47243_b; var x int32; var _ = x << 3.`, `3.`, `untyped float`},
313 {`package issue47243_c; var x int32; var _ = 1 << x`, `1 << x`, `int`},
314 {`package issue47243_d; var x int32; var _ = 1 << x`, `1`, `int`},
315 {`package issue47243_e; var x int32; var _ = 1 << 2`, `1`, `untyped int`},
316 {`package issue47243_f; var x int32; var _ = 1 << 2`, `2`, `untyped int`},
317 {`package issue47243_g; var x int32; var _ = int(1) << 2`, `2`, `untyped int`},
318 {`package issue47243_h; var x int32; var _ = 1 << (2 << x)`, `1`, `int`},
319 {`package issue47243_i; var x int32; var _ = 1 << (2 << x)`, `(2 << x)`, `untyped int`},
320 {`package issue47243_j; var x int32; var _ = 1 << (2 << x)`, `2`, `untyped int`},
322 // tests for broken code that doesn't parse or type-check
323 {brokenPkg + `x0; func _() { var x struct {f string}; x.f := 0 }`, `x.f`, `string`},
324 {brokenPkg + `x1; func _() { var z string; type x struct {f string}; y := &x{q: z}}`, `z`, `string`},
325 {brokenPkg + `x2; func _() { var a, b string; type x struct {f string}; z := &x{f: a, f: b,}}`, `b`, `string`},
326 {brokenPkg + `x3; var x = panic("");`, `panic`, `func(interface{})`},
327 {`package x4; func _() { panic("") }`, `panic`, `func(interface{})`},
328 {brokenPkg + `x5; func _() { var x map[string][...]int; x = map[string][...]int{"": {1,2,3}} }`, `x`, `map[string]invalid type`},
330 // parameterized functions
331 {`package p0; func f[T any](T) {}; var _ = f[int]`, `f`, `func[T any](T)`},
332 {`package p1; func f[T any](T) {}; var _ = f[int]`, `f[int]`, `func(int)`},
333 {`package p2; func f[T any](T) {}; func _() { f(42) }`, `f`, `func(int)`},
334 {`package p3; func f[T any](T) {}; func _() { f[int](42) }`, `f[int]`, `func(int)`},
335 {`package p4; func f[T any](T) {}; func _() { f[int](42) }`, `f`, `func[T any](T)`},
336 {`package p5; func f[T any](T) {}; func _() { f(42) }`, `f(42)`, `()`},
339 {`package t0; type t[] int; var _ t`, `t`, `t0.t`}, // t[] is a syntax error that is ignored in this test in favor of t
340 {`package t1; type t[P any] int; var _ t[int]`, `t`, `t1.t[P any]`},
341 {`package t2; type t[P interface{}] int; var _ t[int]`, `t`, `t2.t[P interface{}]`},
342 {`package t3; type t[P, Q interface{}] int; var _ t[int, int]`, `t`, `t3.t[P, Q interface{}]`},
343 {brokenPkg + `t4; type t[P, Q interface{ m() }] int; var _ t[int, int]`, `t`, `broken_t4.t[P, Q interface{m()}]`},
345 // instantiated types must be sanitized
346 {`package g0; type t[P any] int; var x struct{ f t[int] }; var _ = x.f`, `x.f`, `g0.t[int]`},
348 // go.dev/issue/45096
349 {`package issue45096; func _[T interface{ ~int8 | ~int16 | ~int32 }](x T) { _ = x < 0 }`, `0`, `T`},
351 // go.dev/issue/47895
352 {`package p; import "unsafe"; type S struct { f int }; var s S; var _ = unsafe.Offsetof(s.f)`, `s.f`, `int`},
354 // go.dev/issue/50093
355 {`package u0a; func _[_ interface{int}]() {}`, `int`, `int`},
356 {`package u1a; func _[_ interface{~int}]() {}`, `~int`, `~int`},
357 {`package u2a; func _[_ interface{int | string}]() {}`, `int | string`, `int | string`},
358 {`package u3a; func _[_ interface{int | string | ~bool}]() {}`, `int | string | ~bool`, `int | string | ~bool`},
359 {`package u3a; func _[_ interface{int | string | ~bool}]() {}`, `int | string`, `int | string`},
360 {`package u3a; func _[_ interface{int | string | ~bool}]() {}`, `~bool`, `~bool`},
361 {`package u3a; func _[_ interface{int | string | ~float64|~bool}]() {}`, `int | string | ~float64`, `int | string | ~float64`},
363 {`package u0b; func _[_ int]() {}`, `int`, `int`},
364 {`package u1b; func _[_ ~int]() {}`, `~int`, `~int`},
365 {`package u2b; func _[_ int | string]() {}`, `int | string`, `int | string`},
366 {`package u3b; func _[_ int | string | ~bool]() {}`, `int | string | ~bool`, `int | string | ~bool`},
367 {`package u3b; func _[_ int | string | ~bool]() {}`, `int | string`, `int | string`},
368 {`package u3b; func _[_ int | string | ~bool]() {}`, `~bool`, `~bool`},
369 {`package u3b; func _[_ int | string | ~float64|~bool]() {}`, `int | string | ~float64`, `int | string | ~float64`},
371 {`package u0c; type _ interface{int}`, `int`, `int`},
372 {`package u1c; type _ interface{~int}`, `~int`, `~int`},
373 {`package u2c; type _ interface{int | string}`, `int | string`, `int | string`},
374 {`package u3c; type _ interface{int | string | ~bool}`, `int | string | ~bool`, `int | string | ~bool`},
375 {`package u3c; type _ interface{int | string | ~bool}`, `int | string`, `int | string`},
376 {`package u3c; type _ interface{int | string | ~bool}`, `~bool`, `~bool`},
377 {`package u3c; type _ interface{int | string | ~float64|~bool}`, `int | string | ~float64`, `int | string | ~float64`},
380 for _, test := range tests {
381 info := Info{Types: make(map[syntax.Expr]TypeAndValue)}
383 if strings.HasPrefix(test.src, brokenPkg) {
384 pkg, err := typecheck("TypesInfo", test.src, nil, &info)
386 t.Errorf("package %s: expected to fail but passed", pkg.Name())
393 name = mustTypecheck("TypesInfo", test.src, nil, &info).Name()
396 // look for expression type
398 for e, tv := range info.Types {
399 if syntax.String(e) == test.expr {
405 t.Errorf("package %s: no type found for %s", name, test.expr)
409 // check that type is correct
410 if got := typ.String(); got != test.typ {
411 t.Errorf("package %s: got %s; want %s", name, got, test.typ)
416 func TestInstanceInfo(t *testing.T) {
417 const lib = `package lib
424 type testInst struct {
430 var tests = []struct {
432 instances []testInst // recorded instances in source order
434 {`package p0; func f[T any](T) {}; func _() { f(42) }`,
435 []testInst{{`f`, []string{`int`}, `func(int)`}},
437 {`package p1; func f[T any](T) T { panic(0) }; func _() { f('@') }`,
438 []testInst{{`f`, []string{`rune`}, `func(rune) rune`}},
440 {`package p2; func f[T any](...T) T { panic(0) }; func _() { f(0i) }`,
441 []testInst{{`f`, []string{`complex128`}, `func(...complex128) complex128`}},
443 {`package p3; func f[A, B, C any](A, *B, []C) {}; func _() { f(1.2, new(string), []byte{}) }`,
444 []testInst{{`f`, []string{`float64`, `string`, `byte`}, `func(float64, *string, []byte)`}},
446 {`package p4; func f[A, B any](A, *B, ...[]B) {}; func _() { f(1.2, new(byte)) }`,
447 []testInst{{`f`, []string{`float64`, `byte`}, `func(float64, *byte, ...[]byte)`}},
450 {`package s1; func f[T any, P interface{*T}](x T) {}; func _(x string) { f(x) }`,
451 []testInst{{`f`, []string{`string`, `*string`}, `func(x string)`}},
453 {`package s2; func f[T any, P interface{*T}](x []T) {}; func _(x []int) { f(x) }`,
454 []testInst{{`f`, []string{`int`, `*int`}, `func(x []int)`}},
456 {`package s3; type C[T any] interface{chan<- T}; func f[T any, P C[T]](x []T) {}; func _(x []int) { f(x) }`,
458 {`C`, []string{`T`}, `interface{chan<- T}`},
459 {`f`, []string{`int`, `chan<- int`}, `func(x []int)`},
462 {`package 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) }`,
464 {`C`, []string{`T`}, `interface{chan<- T}`},
465 {`C`, []string{`[]*P`}, `interface{chan<- []*P}`},
466 {`f`, []string{`int`, `chan<- int`, `chan<- []*chan<- int`}, `func(x []int)`},
470 {`package t1; func f[T any, P interface{*T}]() T { panic(0) }; func _() { _ = f[string] }`,
471 []testInst{{`f`, []string{`string`, `*string`}, `func() string`}},
473 {`package t2; func f[T any, P interface{*T}]() T { panic(0) }; func _() { _ = (f[string]) }`,
474 []testInst{{`f`, []string{`string`, `*string`}, `func() string`}},
476 {`package t3; type C[T any] interface{chan<- T}; func f[T any, P C[T], Q C[[]*P]]() []T { return nil }; func _() { _ = f[int] }`,
478 {`C`, []string{`T`}, `interface{chan<- T}`},
479 {`C`, []string{`[]*P`}, `interface{chan<- []*P}`},
480 {`f`, []string{`int`, `chan<- int`, `chan<- []*chan<- int`}, `func() []int`},
483 {`package t4; type C[T any] interface{chan<- T}; func f[T any, P C[T], Q C[[]*P]]() []T { return nil }; func _() { _ = (f[int]) }`,
485 {`C`, []string{`T`}, `interface{chan<- T}`},
486 {`C`, []string{`[]*P`}, `interface{chan<- []*P}`},
487 {`f`, []string{`int`, `chan<- int`, `chan<- []*chan<- int`}, `func() []int`},
490 {`package i0; import "lib"; func _() { lib.F(42) }`,
491 []testInst{{`F`, []string{`int`}, `func(int)`}},
494 {`package duplfunc0; func f[T any](T) {}; func _() { f(42); f("foo"); f[int](3) }`,
496 {`f`, []string{`int`}, `func(int)`},
497 {`f`, []string{`string`}, `func(string)`},
498 {`f`, []string{`int`}, `func(int)`},
501 {`package duplfunc1; import "lib"; func _() { lib.F(42); lib.F("foo"); lib.F(3) }`,
503 {`F`, []string{`int`}, `func(int)`},
504 {`F`, []string{`string`}, `func(string)`},
505 {`F`, []string{`int`}, `func(int)`},
509 {`package type0; type T[P interface{~int}] struct{ x P }; var _ T[int]`,
510 []testInst{{`T`, []string{`int`}, `struct{x int}`}},
512 {`package type1; type T[P interface{~int}] struct{ x P }; var _ (T[int])`,
513 []testInst{{`T`, []string{`int`}, `struct{x int}`}},
515 {`package type2; type T[P interface{~int}] struct{ x P }; var _ T[(int)]`,
516 []testInst{{`T`, []string{`int`}, `struct{x int}`}},
518 {`package type3; type T[P1 interface{~[]P2}, P2 any] struct{ x P1; y P2 }; var _ T[[]int, int]`,
519 []testInst{{`T`, []string{`[]int`, `int`}, `struct{x []int; y int}`}},
521 {`package type4; import "lib"; var _ lib.T[int]`,
522 []testInst{{`T`, []string{`int`}, `[]int`}},
525 {`package dupltype0; type T[P interface{~int}] struct{ x P }; var x T[int]; var y T[int]`,
527 {`T`, []string{`int`}, `struct{x int}`},
528 {`T`, []string{`int`}, `struct{x int}`},
531 {`package dupltype1; type T[P ~int] struct{ x P }; func (r *T[Q]) add(z T[Q]) { r.x += z.x }`,
533 {`T`, []string{`Q`}, `struct{x Q}`},
534 {`T`, []string{`Q`}, `struct{x Q}`},
537 {`package dupltype1; import "lib"; var x lib.T[int]; var y lib.T[int]; var z lib.T[string]`,
539 {`T`, []string{`int`}, `[]int`},
540 {`T`, []string{`int`}, `[]int`},
541 {`T`, []string{`string`}, `[]string`},
544 {`package issue51803; func foo[T any](T) {}; func _() { foo[int]( /* leave arg away on purpose */ ) }`,
545 []testInst{{`foo`, []string{`int`}, `func(int)`}},
549 for _, test := range tests {
550 imports := make(testImporter)
553 Error: func(error) {}, // ignore errors
555 instMap := make(map[*syntax.Name]Instance)
556 useMap := make(map[*syntax.Name]Object)
557 makePkg := func(src string) *Package {
558 pkg, _ := typecheck("p.go", src, &conf, &Info{Instances: instMap, Uses: useMap})
559 imports[pkg.Name()] = pkg
563 pkg := makePkg(test.src)
565 t.Run(pkg.Name(), func(t *testing.T) {
566 // Sort instances in source order for stability.
567 instances := sortedInstances(instMap)
568 if got, want := len(instances), len(test.instances); got != want {
569 t.Fatalf("got %d instances, want %d", got, want)
572 // Pairwise compare with the expected instances.
573 for ii, inst := range instances {
575 for i := 0; i < inst.Inst.TypeArgs.Len(); i++ {
576 targs = append(targs, inst.Inst.TypeArgs.At(i))
578 typ := inst.Inst.Type
580 testInst := test.instances[ii]
581 if got := inst.Name.Value; got != testInst.name {
582 t.Fatalf("got name %s, want %s", got, testInst.name)
585 if len(targs) != len(testInst.targs) {
586 t.Fatalf("got %d type arguments; want %d", len(targs), len(testInst.targs))
588 for i, targ := range targs {
589 if got := targ.String(); got != testInst.targs[i] {
590 t.Errorf("type argument %d: got %s; want %s", i, got, testInst.targs[i])
593 if got := typ.Underlying().String(); got != testInst.typ {
594 t.Errorf("package %s: got %s; want %s", pkg.Name(), got, testInst.typ)
597 // Verify the invariant that re-instantiating the corresponding generic
598 // type with TypeArgs results in an identical instance.
599 ptype := useMap[inst.Name].Type()
600 lister, _ := ptype.(interface{ TypeParams() *TypeParamList })
601 if lister == nil || lister.TypeParams().Len() == 0 {
602 t.Fatalf("info.Types[%v] = %v, want parameterized type", inst.Name, ptype)
604 inst2, err := Instantiate(nil, ptype, targs, true)
606 t.Errorf("Instantiate(%v, %v) failed: %v", ptype, targs, err)
608 if !Identical(inst.Inst.Type, inst2) {
609 t.Errorf("%v and %v are not identical", inst.Inst.Type, inst2)
616 type recordedInstance struct {
621 func sortedInstances(m map[*syntax.Name]Instance) (instances []recordedInstance) {
622 for id, inst := range m {
623 instances = append(instances, recordedInstance{id, inst})
625 sort.Slice(instances, func(i, j int) bool {
626 return CmpPos(instances[i].Name.Pos(), instances[j].Name.Pos()) < 0
631 func TestDefsInfo(t *testing.T) {
632 var tests = []struct {
637 {`package p0; const x = 42`, `x`, `const p0.x untyped int`},
638 {`package p1; const x int = 42`, `x`, `const p1.x int`},
639 {`package p2; var x int`, `x`, `var p2.x int`},
640 {`package p3; type x int`, `x`, `type p3.x int`},
641 {`package p4; func f()`, `f`, `func p4.f()`},
642 {`package p5; func f() int { x, _ := 1, 2; return x }`, `_`, `var _ int`},
644 // Tests using generics.
645 {`package g0; type x[T any] int`, `x`, `type g0.x[T any] int`},
646 {`package g1; func f[T any]() {}`, `f`, `func g1.f[T any]()`},
647 {`package g2; type x[T any] int; func (*x[_]) m() {}`, `m`, `func (*g2.x[_]).m()`},
650 for _, test := range tests {
652 Defs: make(map[*syntax.Name]Object),
654 name := mustTypecheck("DefsInfo", test.src, nil, &info).Name()
658 for id, obj := range info.Defs {
659 if id.Value == test.obj {
665 t.Errorf("package %s: %s not found", name, test.obj)
669 if got := def.String(); got != test.want {
670 t.Errorf("package %s: got %s; want %s", name, got, test.want)
675 func TestUsesInfo(t *testing.T) {
676 var tests = []struct {
681 {`package p0; func _() { _ = x }; const x = 42`, `x`, `const p0.x untyped int`},
682 {`package p1; func _() { _ = x }; const x int = 42`, `x`, `const p1.x int`},
683 {`package p2; func _() { _ = x }; var x int`, `x`, `var p2.x int`},
684 {`package p3; func _() { type _ x }; type x int`, `x`, `type p3.x int`},
685 {`package p4; func _() { _ = f }; func f()`, `f`, `func p4.f()`},
687 // Tests using generics.
688 {`package g0; func _[T any]() { _ = x }; const x = 42`, `x`, `const g0.x untyped int`},
689 {`package g1; func _[T any](x T) { }`, `T`, `type parameter T any`},
690 {`package g2; type N[A any] int; var _ N[int]`, `N`, `type g2.N[A any] int`},
691 {`package g3; type N[A any] int; func (N[_]) m() {}`, `N`, `type g3.N[A any] int`},
693 // Uses of fields are instantiated.
694 {`package s1; type N[A any] struct{ a A }; var f = N[int]{}.a`, `a`, `field a int`},
695 {`package s1; type N[A any] struct{ a A }; func (r N[B]) m(b B) { r.a = b }`, `a`, `field a B`},
697 // Uses of methods are uses of the instantiated method.
698 {`package m0; type N[A any] int; func (r N[B]) m() { r.n() }; func (N[C]) n() {}`, `n`, `func (m0.N[B]).n()`},
699 {`package m1; type N[A any] int; func (r N[B]) m() { }; var f = N[int].m`, `m`, `func (m1.N[int]).m()`},
700 {`package m2; func _[A any](v interface{ m() A }) { v.m() }`, `m`, `func (interface).m() A`},
701 {`package m3; func f[A any]() interface{ m() A } { return nil }; var _ = f[int]().m()`, `m`, `func (interface).m() int`},
702 {`package m4; type T[A any] func() interface{ m() A }; var x T[int]; var y = x().m`, `m`, `func (interface).m() int`},
703 {`package m5; type T[A any] interface{ m() A }; func _[B any](t T[B]) { t.m() }`, `m`, `func (m5.T[B]).m() B`},
704 {`package m6; type T[A any] interface{ m() }; func _[B any](t T[B]) { t.m() }`, `m`, `func (m6.T[B]).m()`},
705 {`package m7; type T[A any] interface{ m() A }; func _(t T[int]) { t.m() }`, `m`, `func (m7.T[int]).m() int`},
706 {`package m8; type T[A any] interface{ m() }; func _(t T[int]) { t.m() }`, `m`, `func (m8.T[int]).m()`},
707 {`package m9; type T[A any] interface{ m() }; func _(t T[int]) { _ = t.m }`, `m`, `func (m9.T[int]).m()`},
709 `package m10; type E[A any] interface{ m() }; type T[B any] interface{ E[B]; n() }; func _(t T[int]) { t.m() }`,
711 `func (m10.E[int]).m()`,
715 for _, test := range tests {
717 Uses: make(map[*syntax.Name]Object),
719 name := mustTypecheck("UsesInfo", test.src, nil, &info).Name()
723 for id, obj := range info.Uses {
724 if id.Value == test.obj {
726 panic(fmt.Sprintf("multiple uses of %q", id.Value))
732 t.Errorf("package %s: %s not found", name, test.obj)
736 if got := use.String(); got != test.want {
737 t.Errorf("package %s: got %s; want %s", name, got, test.want)
742 func TestGenericMethodInfo(t *testing.T) {
747 func (r N[B]) m() { r.m(); r.n() }
749 func (r *N[C]) n() { }
751 f := mustParse("p.go", src)
753 Defs: make(map[*syntax.Name]Object),
754 Uses: make(map[*syntax.Name]Object),
755 Selections: make(map[*syntax.SelectorExpr]*Selection),
758 pkg, err := conf.Check("p", []*syntax.File{f}, &info)
763 N := pkg.Scope().Lookup("N").Type().(*Named)
765 // Find the generic methods stored on N.
766 gm, gn := N.Method(0), N.Method(1)
767 if gm.Name() == "n" {
771 // Collect objects from info.
772 var dm, dn *Func // the declared methods
773 var dmm, dmn *Func // the methods used in the body of m
774 for _, decl := range f.DeclList {
775 fdecl, ok := decl.(*syntax.FuncDecl)
779 def := info.Defs[fdecl.Name].(*Func)
780 switch fdecl.Name.Value {
783 syntax.Inspect(fdecl.Body, func(n syntax.Node) bool {
784 if call, ok := n.(*syntax.CallExpr); ok {
785 sel := call.Fun.(*syntax.SelectorExpr)
786 use := info.Uses[sel.Sel].(*Func)
787 selection := info.Selections[sel]
788 if selection.Kind() != MethodVal {
789 t.Errorf("Selection kind = %v, want %v", selection.Kind(), MethodVal)
791 if selection.Obj() != use {
792 t.Errorf("info.Selections contains %v, want %v", selection.Obj(), use)
794 switch sel.Sel.Value {
809 t.Errorf(`N.Method(...) returns %v for "m", but Info.Defs has %v`, gm, dm)
812 t.Errorf(`N.Method(...) returns %v for "m", but Info.Defs has %v`, gm, dm)
815 t.Errorf(`Inside "m", r.m uses %v, want the defined func %v`, dmm, dm)
818 t.Errorf(`Inside "m", r.n uses %v, want a func distinct from %v`, dmm, dm)
822 func TestImplicitsInfo(t *testing.T) {
823 testenv.MustHaveGoBuild(t)
825 var tests = []struct {
829 {`package p2; import . "fmt"; var _ = Println`, ""}, // no Implicits entry
830 {`package p0; import local "fmt"; var _ = local.Println`, ""}, // no Implicits entry
831 {`package p1; import "fmt"; var _ = fmt.Println`, "importSpec: package fmt"},
833 {`package p3; func f(x interface{}) { switch x.(type) { case int: } }`, ""}, // no Implicits entry
834 {`package p4; func f(x interface{}) { switch t := x.(type) { case int: _ = t } }`, "caseClause: var t int"},
835 {`package p5; func f(x interface{}) { switch t := x.(type) { case int, uint: _ = t } }`, "caseClause: var t interface{}"},
836 {`package p6; func f(x interface{}) { switch t := x.(type) { default: _ = t } }`, "caseClause: var t interface{}"},
838 {`package p7; func f(x int) {}`, ""}, // no Implicits entry
839 {`package p8; func f(int) {}`, "field: var int"},
840 {`package p9; func f() (complex64) { return 0 }`, "field: var complex64"},
841 {`package p10; type T struct{}; func (*T) f() {}`, "field: var *p10.T"},
843 // Tests using generics.
844 {`package f0; func f[T any](x int) {}`, ""}, // no Implicits entry
845 {`package f1; func f[T any](int) {}`, "field: var int"},
846 {`package f2; func f[T any](T) {}`, "field: var T"},
847 {`package f3; func f[T any]() (complex64) { return 0 }`, "field: var complex64"},
848 {`package f4; func f[T any](t T) (T) { return t }`, "field: var T"},
849 {`package t0; type T[A any] struct{}; func (*T[_]) f() {}`, "field: var *t0.T[_]"},
850 {`package t1; type T[A any] struct{}; func _(x interface{}) { switch t := x.(type) { case T[int]: _ = t } }`, "caseClause: var t t1.T[int]"},
851 {`package t2; type T[A any] struct{}; func _[P any](x interface{}) { switch t := x.(type) { case T[P]: _ = t } }`, "caseClause: var t t2.T[P]"},
852 {`package t3; func _[P any](x interface{}) { switch t := x.(type) { case P: _ = t } }`, "caseClause: var t P"},
855 for _, test := range tests {
857 Implicits: make(map[syntax.Node]Object),
859 name := mustTypecheck("ImplicitsInfo", test.src, nil, &info).Name()
861 // the test cases expect at most one Implicits entry
862 if len(info.Implicits) > 1 {
863 t.Errorf("package %s: %d Implicits entries found", name, len(info.Implicits))
867 // extract Implicits entry, if any
869 for n, obj := range info.Implicits {
870 switch x := n.(type) {
871 case *syntax.ImportDecl:
873 case *syntax.CaseClause:
878 t.Fatalf("package %s: unexpected %T", name, x)
880 got += ": " + obj.String()
884 if got != test.want {
885 t.Errorf("package %s: got %q; want %q", name, got, test.want)
890 func predString(tv TypeAndValue) string {
891 var buf strings.Builder
892 pred := func(b bool, s string) {
895 buf.WriteString(", ")
901 pred(tv.IsVoid(), "void")
902 pred(tv.IsType(), "type")
903 pred(tv.IsBuiltin(), "builtin")
904 pred(tv.IsValue() && tv.Value != nil, "const")
905 pred(tv.IsValue() && tv.Value == nil, "value")
906 pred(tv.IsNil(), "nil")
907 pred(tv.Addressable(), "addressable")
908 pred(tv.Assignable(), "assignable")
909 pred(tv.HasOk(), "hasOk")
917 func TestPredicatesInfo(t *testing.T) {
918 testenv.MustHaveGoBuild(t)
920 var tests = []struct {
926 {`package n0; func f() { f() }`, `f()`, `void`},
929 {`package t0; type _ int`, `int`, `type`},
930 {`package t1; type _ []int`, `[]int`, `type`},
931 {`package t2; type _ func()`, `func()`, `type`},
932 {`package t3; type _ func(int)`, `int`, `type`},
933 {`package t3; type _ func(...int)`, `...int`, `type`},
936 {`package b0; var _ = len("")`, `len`, `builtin`},
937 {`package b1; var _ = (len)("")`, `(len)`, `builtin`},
940 {`package c0; var _ = 42`, `42`, `const`},
941 {`package c1; var _ = "foo" + "bar"`, `"foo" + "bar"`, `const`},
942 {`package c2; const (i = 1i; _ = i)`, `i`, `const`},
945 {`package v0; var (a, b int; _ = a + b)`, `a + b`, `value`},
946 {`package v1; var _ = &[]int{1}`, `[]int{…}`, `value`},
947 {`package v2; var _ = func(){}`, `func() {}`, `value`},
948 {`package v4; func f() { _ = f }`, `f`, `value`},
949 {`package v3; var _ *int = nil`, `nil`, `value, nil`},
950 {`package v3; var _ *int = (nil)`, `(nil)`, `value, nil`},
952 // addressable (and thus assignable) operands
953 {`package a0; var (x int; _ = x)`, `x`, `value, addressable, assignable`},
954 {`package a1; var (p *int; _ = *p)`, `*p`, `value, addressable, assignable`},
955 {`package a2; var (s []int; _ = s[0])`, `s[0]`, `value, addressable, assignable`},
956 {`package a3; var (s struct{f int}; _ = s.f)`, `s.f`, `value, addressable, assignable`},
957 {`package a4; var (a [10]int; _ = a[0])`, `a[0]`, `value, addressable, assignable`},
958 {`package a5; func _(x int) { _ = x }`, `x`, `value, addressable, assignable`},
959 {`package a6; func _()(x int) { _ = x; return }`, `x`, `value, addressable, assignable`},
960 {`package a7; type T int; func (x T) _() { _ = x }`, `x`, `value, addressable, assignable`},
961 // composite literals are not addressable
963 // assignable but not addressable values
964 {`package s0; var (m map[int]int; _ = m[0])`, `m[0]`, `value, assignable, hasOk`},
965 {`package s1; var (m map[int]int; _, _ = m[0])`, `m[0]`, `value, assignable, hasOk`},
968 {`package k0; var (ch chan int; _ = <-ch)`, `<-ch`, `value, hasOk`},
969 {`package k1; var (ch chan int; _, _ = <-ch)`, `<-ch`, `value, hasOk`},
972 // - package names are collected in the Uses map
973 // - identifiers being declared are collected in the Defs map
974 {`package m0; import "os"; func _() { _ = os.Stdout }`, `os`, `<missing>`},
975 {`package m1; import p "os"; func _() { _ = p.Stdout }`, `p`, `<missing>`},
976 {`package m2; const c = 0`, `c`, `<missing>`},
977 {`package m3; type T int`, `T`, `<missing>`},
978 {`package m4; var v int`, `v`, `<missing>`},
979 {`package m5; func f() {}`, `f`, `<missing>`},
980 {`package m6; func _(x int) {}`, `x`, `<missing>`},
981 {`package m6; func _()(x int) { return }`, `x`, `<missing>`},
982 {`package m6; type T int; func (x T) _() {}`, `x`, `<missing>`},
985 for _, test := range tests {
986 info := Info{Types: make(map[syntax.Expr]TypeAndValue)}
987 name := mustTypecheck("PredicatesInfo", test.src, nil, &info).Name()
989 // look for expression predicates
991 for e, tv := range info.Types {
992 //println(name, syntax.String(e))
993 if syntax.String(e) == test.expr {
999 if got != test.pred {
1000 t.Errorf("package %s: got %s; want %s", name, got, test.pred)
1005 func TestScopesInfo(t *testing.T) {
1006 testenv.MustHaveGoBuild(t)
1008 var tests = []struct {
1010 scopes []string // list of scope descriptors of the form kind:varlist
1012 {`package p0`, []string{
1015 {`package p1; import ( "fmt"; m "math"; _ "os" ); var ( _ = fmt.Println; _ = m.Pi )`, []string{
1018 {`package p2; func _() {}`, []string{
1021 {`package p3; func _(x, y int) {}`, []string{
1022 "file:", "func:x y",
1024 {`package p4; func _(x, y int) { x, z := 1, 2; _ = z }`, []string{
1025 "file:", "func:x y z", // redeclaration of x
1027 {`package p5; func _(x, y int) (u, _ int) { return }`, []string{
1028 "file:", "func:u x y",
1030 {`package p6; func _() { { var x int; _ = x } }`, []string{
1031 "file:", "func:", "block:x",
1033 {`package p7; func _() { if true {} }`, []string{
1034 "file:", "func:", "if:", "block:",
1036 {`package p8; func _() { if x := 0; x < 0 { y := x; _ = y } }`, []string{
1037 "file:", "func:", "if:x", "block:y",
1039 {`package p9; func _() { switch x := 0; x {} }`, []string{
1040 "file:", "func:", "switch:x",
1042 {`package p10; func _() { switch x := 0; x { case 1: y := x; _ = y; default: }}`, []string{
1043 "file:", "func:", "switch:x", "case:y", "case:",
1045 {`package p11; func _(t interface{}) { switch t.(type) {} }`, []string{
1046 "file:", "func:t", "switch:",
1048 {`package p12; func _(t interface{}) { switch t := t; t.(type) {} }`, []string{
1049 "file:", "func:t", "switch:t",
1051 {`package p13; func _(t interface{}) { switch x := t.(type) { case int: _ = x } }`, []string{
1052 "file:", "func:t", "switch:", "case:x", // x implicitly declared
1054 {`package p14; func _() { select{} }`, []string{
1057 {`package p15; func _(c chan int) { select{ case <-c: } }`, []string{
1058 "file:", "func:c", "comm:",
1060 {`package p16; func _(c chan int) { select{ case i := <-c: x := i; _ = x} }`, []string{
1061 "file:", "func:c", "comm:i x",
1063 {`package p17; func _() { for{} }`, []string{
1064 "file:", "func:", "for:", "block:",
1066 {`package p18; func _(n int) { for i := 0; i < n; i++ { _ = i } }`, []string{
1067 "file:", "func:n", "for:i", "block:",
1069 {`package p19; func _(a []int) { for i := range a { _ = i} }`, []string{
1070 "file:", "func:a", "for:i", "block:",
1072 {`package p20; var s int; func _(a []int) { for i, x := range a { s += x; _ = i } }`, []string{
1073 "file:", "func:a", "for:i x", "block:",
1077 for _, test := range tests {
1078 info := Info{Scopes: make(map[syntax.Node]*Scope)}
1079 name := mustTypecheck("ScopesInfo", test.src, nil, &info).Name()
1081 // number of scopes must match
1082 if len(info.Scopes) != len(test.scopes) {
1083 t.Errorf("package %s: got %d scopes; want %d", name, len(info.Scopes), len(test.scopes))
1086 // scope descriptions must match
1087 for node, scope := range info.Scopes {
1089 switch node.(type) {
1092 case *syntax.FuncType:
1094 case *syntax.BlockStmt:
1096 case *syntax.IfStmt:
1098 case *syntax.SwitchStmt:
1100 case *syntax.SelectStmt:
1102 case *syntax.CaseClause:
1104 case *syntax.CommClause:
1106 case *syntax.ForStmt:
1109 kind = fmt.Sprintf("%T", node)
1112 // look for matching scope description
1113 desc := kind + ":" + strings.Join(scope.Names(), " ")
1115 for _, d := range test.scopes {
1122 t.Errorf("package %s: no matching scope found for %s", name, desc)
1128 func TestInitOrderInfo(t *testing.T) {
1129 var tests = []struct {
1133 {`package p0; var (x = 1; y = x)`, []string{
1136 {`package p1; var (a = 1; b = 2; c = 3)`, []string{
1137 "a = 1", "b = 2", "c = 3",
1139 {`package p2; var (a, b, c = 1, 2, 3)`, []string{
1140 "a = 1", "b = 2", "c = 3",
1142 {`package p3; var _ = f(); func f() int { return 1 }`, []string{
1143 "_ = f()", // blank var
1145 {`package p4; var (a = 0; x = y; y = z; z = 0)`, []string{
1146 "a = 0", "z = 0", "y = z", "x = y",
1148 {`package p5; var (a, _ = m[0]; m map[int]string)`, []string{
1149 "a, _ = m[0]", // blank var
1151 {`package p6; var a, b = f(); func f() (_, _ int) { return z, z }; var z = 0`, []string{
1152 "z = 0", "a, b = f()",
1154 {`package p7; var (a = func() int { return b }(); b = 1)`, []string{
1155 "b = 1", "a = func() int {…}()",
1157 {`package p8; var (a, b = func() (_, _ int) { return c, c }(); c = 1)`, []string{
1158 "c = 1", "a, b = func() (_, _ int) {…}()",
1160 {`package p9; type T struct{}; func (T) m() int { _ = y; return 0 }; var x, y = T.m, 1`, []string{
1163 {`package p10; var (d = c + b; a = 0; b = 0; c = 0)`, []string{
1164 "a = 0", "b = 0", "c = 0", "d = c + b",
1166 {`package p11; var (a = e + c; b = d + c; c = 0; d = 0; e = 0)`, []string{
1167 "c = 0", "d = 0", "b = d + c", "e = 0", "a = e + c",
1169 // emit an initializer for n:1 initializations only once (not for each node
1170 // on the lhs which may appear in different order in the dependency graph)
1171 {`package p12; var (a = x; b = 0; x, y = m[0]; m map[int]int)`, []string{
1172 "b = 0", "x, y = m[0]", "a = x",
1174 // test case from spec section on package initialization
1188 "d = 3", "b = f()", "c = f()", "a = c + b",
1190 // test case for go.dev/issue/7131
1194 func next() int { counter++; return counter }
1197 func makeOrder() []int { return []int{f, b, d, e, c, a} }
1200 var b, c = next(), next()
1201 var d, e, f = next(), next(), next()
1203 "a = next()", "b = next()", "c = next()", "d = next()", "e = next()", "f = next()", "_ = makeOrder()",
1205 // test case for go.dev/issue/10709
1215 func (T) m() int { return 0 }
1217 func makeT(n int) T {
1223 "t = makeT(0)", "v = t.m()",
1225 // test case for go.dev/issue/10709: same as test before, but variable decls swapped
1235 func (T) m() int { return 0 }
1237 func makeT(n int) T {
1243 "t = makeT(0)", "v = t.m()",
1245 // another candidate possibly causing problems with go.dev/issue/10709
1250 func f1() int { return g1() }
1251 func g1() int { f1(); return x1 }
1257 func f2() int { return g2() }
1258 func g2() int { return x2 }
1260 var x2 = 0`, []string{
1261 "x1 = 0", "y1 = f1()", "x2 = 0", "y2 = f2()",
1265 for _, test := range tests {
1267 name := mustTypecheck("InitOrderInfo", test.src, nil, &info).Name()
1269 // number of initializers must match
1270 if len(info.InitOrder) != len(test.inits) {
1271 t.Errorf("package %s: got %d initializers; want %d", name, len(info.InitOrder), len(test.inits))
1275 // initializers must match
1276 for i, want := range test.inits {
1277 got := info.InitOrder[i].String()
1279 t.Errorf("package %s, init %d: got %s; want %s", name, i, got, want)
1286 func TestMultiFileInitOrder(t *testing.T) {
1287 fileA := mustParse("", `package main; var a = 1`)
1288 fileB := mustParse("", `package main; var b = 2`)
1290 // The initialization order must not depend on the parse
1291 // order of the files, only on the presentation order to
1292 // the type-checker.
1293 for _, test := range []struct {
1294 files []*syntax.File
1297 {[]*syntax.File{fileA, fileB}, "[a = 1 b = 2]"},
1298 {[]*syntax.File{fileB, fileA}, "[b = 2 a = 1]"},
1301 if _, err := new(Config).Check("main", test.files, &info); err != nil {
1304 if got := fmt.Sprint(info.InitOrder); got != test.want {
1305 t.Fatalf("got %s; want %s", got, test.want)
1310 func TestFiles(t *testing.T) {
1311 var sources = []string{
1312 "package p; type T struct{}; func (T) m1() {}",
1313 "package p; func (T) m2() {}; var x interface{ m1(); m2() } = T{}",
1314 "package p; func (T) m3() {}; var y interface{ m1(); m2(); m3() } = T{}",
1319 pkg := NewPackage("p", "p")
1321 check := NewChecker(&conf, pkg, &info)
1323 for i, src := range sources {
1324 filename := fmt.Sprintf("sources%d", i)
1325 f := mustParse(filename, src)
1326 if err := check.Files([]*syntax.File{f}); err != nil {
1331 // check InitOrder is [x y]
1333 for _, init := range info.InitOrder {
1334 for _, v := range init.Lhs {
1335 vars = append(vars, v.Name())
1338 if got, want := fmt.Sprint(vars), "[x y]"; got != want {
1339 t.Errorf("InitOrder == %s, want %s", got, want)
1343 type testImporter map[string]*Package
1345 func (m testImporter) Import(path string) (*Package, error) {
1346 if pkg := m[path]; pkg != nil {
1349 return nil, fmt.Errorf("package %q not found", path)
1352 func TestSelection(t *testing.T) {
1353 selections := make(map[*syntax.SelectorExpr]*Selection)
1355 imports := make(testImporter)
1356 conf := Config{Importer: imports}
1357 makePkg := func(path, src string) {
1358 pkg := mustTypecheck(path, src, &conf, &Info{Selections: selections})
1389 type G[P any] struct {
1401 // qualified identifiers
1439 // method expressions
1447 wantOut := map[string][2]string{
1448 "lib.T.M": {"method expr (lib.T) M(lib.T)", ".[0]"},
1450 "A{}.B": {"field (main.A) B *main.B", ".[0]"},
1451 "new(A).B": {"field (*main.A) B *main.B", "->[0]"},
1452 "A{}.C": {"field (main.A) C main.C", ".[1]"},
1453 "new(A).C": {"field (*main.A) C main.C", "->[1]"},
1454 "A{}.b": {"field (main.A) b int", "->[0 0]"},
1455 "new(A).b": {"field (*main.A) b int", "->[0 0]"},
1456 "A{}.c": {"field (main.A) c int", ".[1 0]"},
1457 "new(A).c": {"field (*main.A) c int", "->[1 0]"},
1458 "Inst.p": {"field (main.G[int]) p int", ".[0]"},
1460 "A{}.f": {"method (main.A) f(int)", "->[0 0]"},
1461 "new(A).f": {"method (*main.A) f(int)", "->[0 0]"},
1462 "A{}.g": {"method (main.A) g()", ".[1 0]"},
1463 "new(A).g": {"method (*main.A) g()", "->[1 0]"},
1464 "new(A).h": {"method (*main.A) h()", "->[1 1]"}, // TODO(gri) should this report .[1 1] ?
1465 "B{}.f": {"method (main.B) f(int)", ".[0]"},
1466 "new(B).f": {"method (*main.B) f(int)", "->[0]"},
1467 "C{}.g": {"method (main.C) g()", ".[0]"},
1468 "new(C).g": {"method (*main.C) g()", "->[0]"},
1469 "new(C).h": {"method (*main.C) h()", "->[1]"}, // TODO(gri) should this report .[1] ?
1470 "Inst.m": {"method (main.G[int]) m(int)", ".[0]"},
1472 "A.f": {"method expr (main.A) f(main.A, int)", "->[0 0]"},
1473 "(*A).f": {"method expr (*main.A) f(*main.A, int)", "->[0 0]"},
1474 "B.f": {"method expr (main.B) f(main.B, int)", ".[0]"},
1475 "(*B).f": {"method expr (*main.B) f(*main.B, int)", "->[0]"},
1476 "G[string].m": {"method expr (main.G[string]) m(main.G[string], string)", ".[0]"},
1477 "G[string]{}.p": {"field (main.G[string]) p string", ".[0]"},
1480 makePkg("lib", libSrc)
1481 makePkg("main", mainSrc)
1483 for e, sel := range selections {
1484 _ = sel.String() // assertion: must not panic
1486 start := indexFor(mainSrc, syntax.StartPos(e))
1487 end := indexFor(mainSrc, syntax.EndPos(e))
1488 segment := mainSrc[start:end] // (all SelectorExprs are in main, not lib)
1496 fmt.Sprintf("%s%v", direct, sel.Index()),
1498 want := wantOut[segment]
1500 t.Errorf("%s: got %q; want %q", segment, got, want)
1502 delete(wantOut, segment)
1504 // We must explicitly assert properties of the
1505 // Signature's receiver since it doesn't participate
1506 // in Identical() or String().
1507 sig, _ := sel.Type().(*Signature)
1508 if sel.Kind() == MethodVal {
1509 got := sig.Recv().Type()
1511 if !Identical(got, want) {
1512 t.Errorf("%s: Recv() = %s, want %s", segment, got, want)
1514 } else if sig != nil && sig.Recv() != nil {
1515 t.Errorf("%s: signature has receiver %s", sig, sig.Recv().Type())
1518 // Assert that all wantOut entries were used exactly once.
1519 for segment := range wantOut {
1520 t.Errorf("no syntax.Selection found with syntax %q", segment)
1524 // indexFor returns the index into s corresponding to the position pos.
1525 func indexFor(s string, pos syntax.Pos) int {
1526 i, line := 0, 1 // string index and corresponding line
1527 target := int(pos.Line())
1528 for line < target && i < len(s) {
1534 return i + int(pos.Col()-1) // columns are 1-based
1537 func TestIssue8518(t *testing.T) {
1538 imports := make(testImporter)
1540 Error: func(err error) { t.Log(err) }, // don't exit after first error
1543 makePkg := func(path, src string) {
1544 f := mustParse(path, src)
1545 pkg, _ := conf.Check(path, []*syntax.File{f}, nil) // errors logged via conf.Error
1553 const C2 = missing.C
1563 makePkg("a", libSrc)
1564 makePkg("main", mainSrc) // don't crash when type-checking this package
1567 func TestLookupFieldOrMethodOnNil(t *testing.T) {
1568 // LookupFieldOrMethod on a nil type is expected to produce a run-time panic.
1570 const want = "LookupFieldOrMethod on nil type"
1572 if s, ok := p.(string); !ok || s != want {
1573 t.Fatalf("got %v, want %s", p, want)
1576 LookupFieldOrMethod(nil, false, nil, "")
1579 func TestLookupFieldOrMethod(t *testing.T) {
1580 // Test cases assume a lookup of the form a.f or x.f, where a stands for an
1581 // addressable value, and x for a non-addressable value (even though a variable
1582 // for ease of test case writing).
1583 var tests = []struct {
1590 {"var x T; type T struct{}", false, nil, false},
1591 {"var x T; type T struct{ f int }", true, []int{0}, false},
1592 {"var x T; type T struct{ a, b, f, c int }", true, []int{2}, false},
1594 // field lookups on a generic type
1595 {"var x T[int]; type T[P any] struct{}", false, nil, false},
1596 {"var x T[int]; type T[P any] struct{ f P }", true, []int{0}, false},
1597 {"var x T[int]; type T[P any] struct{ a, b, f, c P }", true, []int{2}, false},
1600 {"var a T; type T struct{}; func (T) f() {}", true, []int{0}, false},
1601 {"var a *T; type T struct{}; func (T) f() {}", true, []int{0}, true},
1602 {"var a T; type T struct{}; func (*T) f() {}", true, []int{0}, false},
1603 {"var a *T; type T struct{}; func (*T) f() {}", true, []int{0}, true}, // TODO(gri) should this report indirect = false?
1605 // method lookups on a generic type
1606 {"var a T[int]; type T[P any] struct{}; func (T[P]) f() {}", true, []int{0}, false},
1607 {"var a *T[int]; type T[P any] struct{}; func (T[P]) f() {}", true, []int{0}, true},
1608 {"var a T[int]; type T[P any] struct{}; func (*T[P]) f() {}", true, []int{0}, false},
1609 {"var a *T[int]; type T[P any] struct{}; func (*T[P]) f() {}", true, []int{0}, true}, // TODO(gri) should this report indirect = false?
1612 {"type ( E1 struct{ f int }; E2 struct{ f int }; x struct{ E1; *E2 })", false, []int{1, 0}, false},
1613 {"type ( E1 struct{ f int }; E2 struct{}; x struct{ E1; *E2 }); func (E2) f() {}", false, []int{1, 0}, false},
1615 // collisions on a generic type
1616 {"type ( E1[P any] struct{ f P }; E2[P any] struct{ f P }; x struct{ E1[int]; *E2[int] })", false, []int{1, 0}, false},
1617 {"type ( E1[P any] struct{ f P }; E2[P any] struct{}; x struct{ E1[int]; *E2[int] }); func (E2[P]) f() {}", false, []int{1, 0}, false},
1619 // outside methodset
1620 // (*T).f method exists, but value of type T is not addressable
1621 {"var x T; type T struct{}; func (*T) f() {}", false, nil, true},
1623 // outside method set of a generic type
1624 {"var x T[int]; type T[P any] struct{}; func (*T[P]) f() {}", false, nil, true},
1626 // recursive generic types; see go.dev/issue/52715
1627 {"var a T[int]; type ( T[P any] struct { *N[P] }; N[P any] struct { *T[P] } ); func (N[P]) f() {}", true, []int{0, 0}, true},
1628 {"var a T[int]; type ( T[P any] struct { *N[P] }; N[P any] struct { *T[P] } ); func (T[P]) f() {}", true, []int{0}, false},
1631 for _, test := range tests {
1632 pkg := mustTypecheck("test", "package p;"+test.src, nil, nil)
1634 obj := pkg.Scope().Lookup("a")
1636 if obj = pkg.Scope().Lookup("x"); obj == nil {
1637 t.Errorf("%s: incorrect test case - no object a or x", test.src)
1642 f, index, indirect := LookupFieldOrMethod(obj.Type(), obj.Name() == "a", pkg, "f")
1643 if (f != nil) != test.found {
1645 t.Errorf("%s: got no object; want one", test.src)
1647 t.Errorf("%s: got object = %v; want none", test.src, f)
1650 if !sameSlice(index, test.index) {
1651 t.Errorf("%s: got index = %v; want %v", test.src, index, test.index)
1653 if indirect != test.indirect {
1654 t.Errorf("%s: got indirect = %v; want %v", test.src, indirect, test.indirect)
1659 // Test for go.dev/issue/52715
1660 func TestLookupFieldOrMethod_RecursiveGeneric(t *testing.T) {
1664 type Tree[T any] struct {
1668 func (*Tree[R]) N(r R) R { return r }
1670 type Node[T any] struct {
1674 type Instance = *Tree[int]
1677 f := mustParse("foo.go", src)
1678 pkg := NewPackage("pkg", f.PkgName.Value)
1679 if err := NewChecker(nil, pkg, nil).Files([]*syntax.File{f}); err != nil {
1683 T := pkg.Scope().Lookup("Instance").Type()
1684 _, _, _ = LookupFieldOrMethod(T, false, pkg, "M") // verify that LookupFieldOrMethod terminates
1687 func sameSlice(a, b []int) bool {
1688 if len(a) != len(b) {
1691 for i, x := range a {
1699 // TestScopeLookupParent ensures that (*Scope).LookupParent returns
1700 // the correct result at various positions within the source.
1701 func TestScopeLookupParent(t *testing.T) {
1702 imports := make(testImporter)
1703 conf := Config{Importer: imports}
1705 makePkg := func(path, src string) {
1706 f := mustParse(path, src)
1708 imports[path], err = conf.Check(path, []*syntax.File{f}, &info)
1714 makePkg("lib", "package lib; var X int")
1715 // Each /*name=kind:line*/ comment makes the test look up the
1716 // name at that point and checks that it resolves to a decl of
1717 // the specified kind and line number. "undef" means undefined.
1719 /*lib=pkgname:5*/ /*X=var:1*/ /*Pi=const:8*/ /*T=typename:9*/ /*Y=var:10*/ /*F=func:12*/
1730 const pi, e = 3.1415, /*pi=undef*/ 2.71828 /*pi=const:13*/ /*e=const:13*/
1731 type /*t=undef*/ t /*t=typename:14*/ *t
1732 print(Y) /*Y=var:10*/
1733 x, Y := Y, /*x=undef*/ /*Y=var:10*/ Pi /*x=var:16*/ /*Y=var:16*/ ; _ = x; _ = Y
1734 var F = /*F=func:12*/ F /*F=var:17*/ ; _ = F
1737 for i, x := range a /*i=undef*/ /*x=var:16*/ { _ = i; _ = x }
1740 switch y := i.(type) { /*y=undef*/
1741 case /*y=undef*/ int /*y=var:23*/ :
1742 case float32, /*y=undef*/ float64 /*y=var:23*/ :
1743 default /*y=var:23*/:
1748 switch int := i.(type) {
1749 case /*int=typename:0*/ int /*int=var:31*/ :
1751 default /*int=var:31*/ :
1757 info.Uses = make(map[*syntax.Name]Object)
1758 makePkg("main", mainSrc)
1759 mainScope := imports["main"].Scope()
1761 rx := regexp.MustCompile(`^/\*(\w*)=([\w:]*)\*/$`)
1763 base := syntax.NewFileBase("main")
1764 syntax.CommentsDo(strings.NewReader(mainSrc), func(line, col uint, text string) {
1765 pos := syntax.MakePos(base, line, col)
1767 // Syntax errors are not comments.
1769 t.Errorf("%s: %s", pos, text)
1773 // Parse the assertion in the comment.
1774 m := rx.FindStringSubmatch(text)
1776 t.Errorf("%s: bad comment: %s", pos, text)
1779 name, want := m[1], m[2]
1781 // Look up the name in the innermost enclosing scope.
1782 inner := mainScope.Innermost(pos)
1784 t.Errorf("%s: at %s: can't find innermost scope", pos, text)
1788 if _, obj := inner.LookupParent(name, pos); obj != nil {
1789 kind := strings.ToLower(strings.TrimPrefix(reflect.TypeOf(obj).String(), "*types2."))
1790 got = fmt.Sprintf("%s:%d", kind, obj.Pos().Line())
1793 t.Errorf("%s: at %s: %s resolved to %s, want %s", pos, text, name, got, want)
1797 // Check that for each referring identifier,
1798 // a lookup of its name on the innermost
1799 // enclosing scope returns the correct object.
1801 for id, wantObj := range info.Uses {
1802 inner := mainScope.Innermost(id.Pos())
1804 t.Errorf("%s: can't find innermost scope enclosing %q", id.Pos(), id.Value)
1808 // Exclude selectors and qualified identifiers---lexical
1809 // refs only. (Ideally, we'd see if the AST parent is a
1810 // SelectorExpr, but that requires PathEnclosingInterval
1811 // from golang.org/x/tools/go/ast/astutil.)
1812 if id.Value == "X" {
1816 _, gotObj := inner.LookupParent(id.Value, id.Pos())
1817 if gotObj != wantObj {
1818 t.Errorf("%s: got %v, want %v", id.Pos(), gotObj, wantObj)
1824 // newDefined creates a new defined type named T with the given underlying type.
1825 func newDefined(underlying Type) *Named {
1826 tname := NewTypeName(nopos, nil, "T", nil)
1827 return NewNamed(tname, underlying, nil)
1830 func TestConvertibleTo(t *testing.T) {
1831 for _, test := range []struct {
1835 {Typ[Int], Typ[Int], true},
1836 {Typ[Int], Typ[Float32], true},
1837 {Typ[Int], Typ[String], true},
1838 {newDefined(Typ[Int]), Typ[Int], true},
1839 {newDefined(new(Struct)), new(Struct), true},
1840 {newDefined(Typ[Int]), new(Struct), false},
1841 {Typ[UntypedInt], Typ[Int], true},
1842 {NewSlice(Typ[Int]), NewArray(Typ[Int], 10), true},
1843 {NewSlice(Typ[Int]), NewArray(Typ[Uint], 10), false},
1844 {NewSlice(Typ[Int]), NewPointer(NewArray(Typ[Int], 10)), true},
1845 {NewSlice(Typ[Int]), NewPointer(NewArray(Typ[Uint], 10)), false},
1846 // Untyped string values are not permitted by the spec, so the behavior below is undefined.
1847 {Typ[UntypedString], Typ[String], true},
1849 if got := ConvertibleTo(test.v, test.t); got != test.want {
1850 t.Errorf("ConvertibleTo(%v, %v) = %t, want %t", test.v, test.t, got, test.want)
1855 func TestAssignableTo(t *testing.T) {
1856 for _, test := range []struct {
1860 {Typ[Int], Typ[Int], true},
1861 {Typ[Int], Typ[Float32], false},
1862 {newDefined(Typ[Int]), Typ[Int], false},
1863 {newDefined(new(Struct)), new(Struct), true},
1864 {Typ[UntypedBool], Typ[Bool], true},
1865 {Typ[UntypedString], Typ[Bool], false},
1866 // Neither untyped string nor untyped numeric assignments arise during
1867 // normal type checking, so the below behavior is technically undefined by
1869 {Typ[UntypedString], Typ[String], true},
1870 {Typ[UntypedInt], Typ[Int], true},
1872 if got := AssignableTo(test.v, test.t); got != test.want {
1873 t.Errorf("AssignableTo(%v, %v) = %t, want %t", test.v, test.t, got, test.want)
1878 func TestIdentical(t *testing.T) {
1879 // For each test, we compare the types of objects X and Y in the source.
1885 {"var X int; var Y int", true},
1886 {"var X int; var Y string", false},
1888 // TODO: add more tests for complex types.
1891 {"type X int; type Y int", false},
1894 {"type X = int; type Y = int", true},
1897 {`func X(int) string { return "" }; func Y(int) string { return "" }`, true},
1898 {`func X() string { return "" }; func Y(int) string { return "" }`, false},
1899 {`func X(int) string { return "" }; func Y(int) {}`, false},
1901 // Generic functions. Type parameters should be considered identical modulo
1902 // renaming. See also go.dev/issue/49722.
1903 {`func X[P ~int](){}; func Y[Q ~int]() {}`, true},
1904 {`func X[P1 any, P2 ~*P1](){}; func Y[Q1 any, Q2 ~*Q1]() {}`, true},
1905 {`func X[P1 any, P2 ~[]P1](){}; func Y[Q1 any, Q2 ~*Q1]() {}`, false},
1906 {`func X[P ~int](P){}; func Y[Q ~int](Q) {}`, true},
1907 {`func X[P ~string](P){}; func Y[Q ~int](Q) {}`, false},
1908 {`func X[P ~int]([]P){}; func Y[Q ~int]([]Q) {}`, true},
1911 for _, test := range tests {
1912 pkg := mustTypecheck("test", "package p;"+test.src, nil, nil)
1913 X := pkg.Scope().Lookup("X")
1914 Y := pkg.Scope().Lookup("Y")
1915 if X == nil || Y == nil {
1916 t.Fatal("test must declare both X and Y")
1918 if got := Identical(X.Type(), Y.Type()); got != test.want {
1919 t.Errorf("Identical(%s, %s) = %t, want %t", X.Type(), Y.Type(), got, test.want)
1924 func TestIdentical_issue15173(t *testing.T) {
1925 // Identical should allow nil arguments and be symmetric.
1926 for _, test := range []struct {
1930 {Typ[Int], Typ[Int], true},
1931 {Typ[Int], nil, false},
1932 {nil, Typ[Int], false},
1935 if got := Identical(test.x, test.y); got != test.want {
1936 t.Errorf("Identical(%v, %v) = %t", test.x, test.y, got)
1941 func TestIdenticalUnions(t *testing.T) {
1942 tname := NewTypeName(nopos, nil, "myInt", nil)
1943 myInt := NewNamed(tname, Typ[Int], nil)
1944 tmap := map[string]*Term{
1945 "int": NewTerm(false, Typ[Int]),
1946 "~int": NewTerm(true, Typ[Int]),
1947 "string": NewTerm(false, Typ[String]),
1948 "~string": NewTerm(true, Typ[String]),
1949 "myInt": NewTerm(false, myInt),
1951 makeUnion := func(s string) *Union {
1952 parts := strings.Split(s, "|")
1954 for _, p := range parts {
1957 t.Fatalf("missing term %q", p)
1959 terms = append(terms, term)
1961 return NewUnion(terms)
1963 for _, test := range []struct {
1967 // These tests are just sanity checks. The tests for type sets and
1968 // interfaces provide much more test coverage.
1969 {"int|~int", "~int", true},
1970 {"myInt|~int", "~int", true},
1971 {"int|string", "string|int", true},
1972 {"int|int|string", "string|int", true},
1973 {"myInt|string", "int|string", false},
1975 x := makeUnion(test.x)
1976 y := makeUnion(test.y)
1977 if got := Identical(x, y); got != test.want {
1978 t.Errorf("Identical(%v, %v) = %t", test.x, test.y, got)
1983 func TestIssue15305(t *testing.T) {
1984 const src = "package p; func f() int16; var _ = f(undef)"
1985 f := mustParse("issue15305.go", src)
1987 Error: func(err error) {}, // allow errors
1990 Types: make(map[syntax.Expr]TypeAndValue),
1992 conf.Check("p", []*syntax.File{f}, info) // ignore result
1993 for e, tv := range info.Types {
1994 if _, ok := e.(*syntax.CallExpr); ok {
1995 if tv.Type != Typ[Int16] {
1996 t.Errorf("CallExpr has type %v, want int16", tv.Type)
2001 t.Errorf("CallExpr has no type")
2004 // TestCompositeLitTypes verifies that Info.Types registers the correct
2005 // types for composite literal expressions and composite literal type
2007 func TestCompositeLitTypes(t *testing.T) {
2008 for _, test := range []struct {
2011 {`[16]byte{}`, `[16]byte`},
2012 {`[...]byte{}`, `[0]byte`}, // test for go.dev/issue/14092
2013 {`[...]int{1, 2, 3}`, `[3]int`}, // test for go.dev/issue/14092
2014 {`[...]int{90: 0, 98: 1, 2}`, `[100]int`}, // test for go.dev/issue/14092
2015 {`[]int{}`, `[]int`},
2016 {`map[string]bool{"foo": true}`, `map[string]bool`},
2017 {`struct{}{}`, `struct{}`},
2018 {`struct{x, y int; z complex128}{}`, `struct{x int; y int; z complex128}`},
2020 f := mustParse(test.lit, "package p; var _ = "+test.lit)
2021 types := make(map[syntax.Expr]TypeAndValue)
2022 if _, err := new(Config).Check("p", []*syntax.File{f}, &Info{Types: types}); err != nil {
2023 t.Fatalf("%s: %v", test.lit, err)
2026 cmptype := func(x syntax.Expr, want string) {
2029 t.Errorf("%s: no Types entry found", test.lit)
2033 t.Errorf("%s: type is nil", test.lit)
2036 if got := tv.Type.String(); got != want {
2037 t.Errorf("%s: got %v, want %s", test.lit, got, want)
2041 // test type of composite literal expression
2042 rhs := f.DeclList[0].(*syntax.VarDecl).Values
2043 cmptype(rhs, test.typ)
2045 // test type of composite literal type expression
2046 cmptype(rhs.(*syntax.CompositeLit).Type, test.typ)
2050 // TestObjectParents verifies that objects have parent scopes or not
2051 // as specified by the Object interface.
2052 func TestObjectParents(t *testing.T) {
2071 func f(x int) { y := x; print(y) }
2074 f := mustParse("src", src)
2077 Defs: make(map[*syntax.Name]Object),
2079 if _, err := new(Config).Check("p", []*syntax.File{f}, info); err != nil {
2083 for ident, obj := range info.Defs {
2085 // only package names and implicit vars have a nil object
2086 // (in this test we only need to handle the package name)
2087 if ident.Value != "p" {
2088 t.Errorf("%v has nil object", ident)
2093 // struct fields, type-associated and interface methods
2094 // have no parent scope
2096 switch obj := obj.(type) {
2102 if obj.Type().(*Signature).Recv() != nil { // method
2107 gotParent := obj.Parent() != nil
2109 case gotParent && !wantParent:
2110 t.Errorf("%v: want no parent, got %s", ident, obj.Parent())
2111 case !gotParent && wantParent:
2112 t.Errorf("%v: no parent found", ident)
2117 // TestFailedImport tests that we don't get follow-on errors
2118 // elsewhere in a package due to failing to import a package.
2119 func TestFailedImport(t *testing.T) {
2120 testenv.MustHaveGoBuild(t)
2125 import foo "go/types/thisdirectorymustnotexistotherwisethistestmayfail/foo" // should only see an error here
2130 func f(x T) T { return foo.F(x) }
2132 f := mustParse("src", src)
2133 files := []*syntax.File{f}
2135 // type-check using all possible importers
2136 for _, compiler := range []string{"gc", "gccgo", "source"} {
2139 Error: func(err error) {
2140 // we should only see the import error
2141 if errcount > 0 || !strings.Contains(err.Error(), "could not import") {
2142 t.Errorf("for %s importer, got unexpected error: %v", compiler, err)
2146 //Importer: importer.For(compiler, nil),
2150 Uses: make(map[*syntax.Name]Object),
2152 pkg, _ := conf.Check("p", files, info)
2154 t.Errorf("for %s importer, type-checking failed to return a package", compiler)
2158 imports := pkg.Imports()
2159 if len(imports) != 1 {
2160 t.Errorf("for %s importer, got %d imports, want 1", compiler, len(imports))
2164 if imp.Name() != "foo" {
2165 t.Errorf(`for %s importer, got %q, want "foo"`, compiler, imp.Name())
2169 // verify that all uses of foo refer to the imported package foo (imp)
2170 for ident, obj := range info.Uses {
2171 if ident.Value == "foo" {
2172 if obj, ok := obj.(*PkgName); ok {
2173 if obj.Imported() != imp {
2174 t.Errorf("%s resolved to %v; want %v", ident.Value, obj.Imported(), imp)
2177 t.Errorf("%s resolved to %v; want package name", ident.Value, obj)
2184 func TestInstantiate(t *testing.T) {
2185 // eventually we like more tests but this is a start
2186 const src = "package p; type T[P any] *T[P]"
2187 pkg := mustTypecheck(".", src, nil, nil)
2189 // type T should have one type parameter
2190 T := pkg.Scope().Lookup("T").Type().(*Named)
2191 if n := T.TypeParams().Len(); n != 1 {
2192 t.Fatalf("expected 1 type parameter; found %d", n)
2195 // instantiation should succeed (no endless recursion)
2196 // even with a nil *Checker
2197 res, err := Instantiate(nil, T, []Type{Typ[Int]}, false)
2202 // instantiated type should point to itself
2203 if p := res.Underlying().(*Pointer).Elem(); p != res {
2204 t.Fatalf("unexpected result type: %s points to %s", res, p)
2208 func TestInstantiateErrors(t *testing.T) {
2210 src string // by convention, T must be the type being instantiated
2212 wantAt int // -1 indicates no error
2214 {"type T[P interface{~string}] int", []Type{Typ[Int]}, 0},
2215 {"type T[P1 interface{int}, P2 interface{~string}] int", []Type{Typ[Int], Typ[Int]}, 1},
2216 {"type T[P1 any, P2 interface{~[]P1}] int", []Type{Typ[Int], NewSlice(Typ[String])}, 1},
2217 {"type T[P1 interface{~[]P2}, P2 any] int", []Type{NewSlice(Typ[String]), Typ[Int]}, 0},
2220 for _, test := range tests {
2221 src := "package p; " + test.src
2222 pkg := mustTypecheck(".", src, nil, nil)
2224 T := pkg.Scope().Lookup("T").Type().(*Named)
2226 _, err := Instantiate(nil, T, test.targs, true)
2228 t.Fatalf("Instantiate(%v, %v) returned nil error, want non-nil", T, test.targs)
2231 var argErr *ArgumentError
2232 if !errors.As(err, &argErr) {
2233 t.Fatalf("Instantiate(%v, %v): error is not an *ArgumentError", T, test.targs)
2236 if argErr.Index != test.wantAt {
2237 t.Errorf("Instantiate(%v, %v): error at index %d, want index %d", T, test.targs, argErr.Index, test.wantAt)
2242 func TestArgumentErrorUnwrapping(t *testing.T) {
2243 var err error = &ArgumentError{
2245 Err: Error{Msg: "test"},
2248 if !errors.As(err, &e) {
2249 t.Fatalf("error %v does not wrap types.Error", err)
2251 if e.Msg != "test" {
2252 t.Errorf("e.Msg = %q, want %q", e.Msg, "test")
2256 func TestInstanceIdentity(t *testing.T) {
2257 imports := make(testImporter)
2258 conf := Config{Importer: imports}
2259 makePkg := func(src string) {
2260 f := mustParse("", src)
2261 name := f.PkgName.Value
2262 pkg, err := conf.Check(name, []*syntax.File{f}, nil)
2268 makePkg(`package lib; type T[P any] struct{}`)
2269 makePkg(`package a; import "lib"; var A lib.T[int]`)
2270 makePkg(`package b; import "lib"; var B lib.T[int]`)
2271 a := imports["a"].Scope().Lookup("A")
2272 b := imports["b"].Scope().Lookup("B")
2273 if !Identical(a.Type(), b.Type()) {
2274 t.Errorf("mismatching types: a.A: %s, b.B: %s", a.Type(), b.Type())
2278 // TestInstantiatedObjects verifies properties of instantiated objects.
2279 func TestInstantiatedObjects(t *testing.T) {
2283 type T[P any] struct {
2287 func (recv *T[Q]) concreteMethod(mParam Q) (mResult Q) { return }
2289 type FT[P any] func(ftParam P) (ftResult P)
2291 func F[P any](fParam P) (fResult P){ return }
2293 type I[P any] interface {
2299 func (R[P]) m() {} // having a method triggers expansion of R
2314 Defs: make(map[*syntax.Name]Object),
2316 f := mustParse("p.go", src)
2318 pkg, err := conf.Check(f.PkgName.Value, []*syntax.File{f}, info)
2323 lookup := func(name string) Type { return pkg.Scope().Lookup(name).Type() }
2324 fnScope := pkg.Scope().Lookup("fn").(*Func).Scope()
2331 {"field", lookup("t").Underlying().(*Struct).Field(0)},
2332 {"field", fnScope.Lookup("r").Type().Underlying().(*Struct).Field(0)},
2334 // Methods and method fields
2335 {"concreteMethod", lookup("t").(*Named).Method(0)},
2336 {"recv", lookup("t").(*Named).Method(0).Type().(*Signature).Recv()},
2337 {"mParam", lookup("t").(*Named).Method(0).Type().(*Signature).Params().At(0)},
2338 {"mResult", lookup("t").(*Named).Method(0).Type().(*Signature).Results().At(0)},
2340 // Interface methods
2341 {"interfaceMethod", lookup("i").Underlying().(*Interface).Method(0)},
2343 // Function type fields
2344 {"ftParam", lookup("ft").Underlying().(*Signature).Params().At(0)},
2345 {"ftResult", lookup("ft").Underlying().(*Signature).Results().At(0)},
2348 {"fParam", lookup("f").(*Signature).Params().At(0)},
2349 {"fResult", lookup("f").(*Signature).Results().At(0)},
2352 // Collect all identifiers by name.
2353 idents := make(map[string][]*syntax.Name)
2354 syntax.Inspect(f, func(n syntax.Node) bool {
2355 if id, ok := n.(*syntax.Name); ok {
2356 idents[id.Value] = append(idents[id.Value], id)
2361 for _, test := range tests {
2363 t.Run(test.name, func(t *testing.T) {
2364 if got := len(idents[test.name]); got != 1 {
2365 t.Fatalf("found %d identifiers named %s, want 1", got, test.name)
2367 ident := idents[test.name][0]
2368 def := info.Defs[ident]
2369 if def == test.obj {
2370 t.Fatalf("info.Defs[%s] contains the test object", test.name)
2372 if orig := originObject(test.obj); def != orig {
2373 t.Errorf("info.Defs[%s] does not match obj.Origin()", test.name)
2375 if def.Pkg() != test.obj.Pkg() {
2376 t.Errorf("Pkg() = %v, want %v", def.Pkg(), test.obj.Pkg())
2378 if def.Name() != test.obj.Name() {
2379 t.Errorf("Name() = %v, want %v", def.Name(), test.obj.Name())
2381 if def.Pos() != test.obj.Pos() {
2382 t.Errorf("Pos() = %v, want %v", def.Pos(), test.obj.Pos())
2384 if def.Parent() != test.obj.Parent() {
2385 t.Fatalf("Parent() = %v, want %v", def.Parent(), test.obj.Parent())
2387 if def.Exported() != test.obj.Exported() {
2388 t.Fatalf("Exported() = %v, want %v", def.Exported(), test.obj.Exported())
2390 if def.Id() != test.obj.Id() {
2391 t.Fatalf("Id() = %v, want %v", def.Id(), test.obj.Id())
2393 // String and Type are expected to differ.
2398 func originObject(obj Object) Object {
2399 switch obj := obj.(type) {
2408 func TestImplements(t *testing.T) {
2412 type EmptyIface interface{}
2423 type Integer interface{
2424 int8 | int16 | int32 | int64
2427 type EmptyTypeSet interface{
2444 type Bad Bad // invalid type
2447 f := mustParse("p.go", src)
2448 conf := Config{Error: func(error) {}}
2449 pkg, _ := conf.Check(f.PkgName.Value, []*syntax.File{f}, nil)
2451 lookup := func(tname string) Type { return pkg.Scope().Lookup(tname).Type() }
2453 EmptyIface = lookup("EmptyIface").Underlying().(*Interface)
2454 I = lookup("I").(*Named)
2455 II = I.Underlying().(*Interface)
2456 C = lookup("C").(*Named)
2457 CI = C.Underlying().(*Interface)
2458 Integer = lookup("Integer").Underlying().(*Interface)
2459 EmptyTypeSet = lookup("EmptyTypeSet").Underlying().(*Interface)
2461 N1p = NewPointer(N1)
2463 N2p = NewPointer(N2)
2478 {Typ[Int8], Integer, true},
2479 {Typ[Int64], Integer, true},
2480 {Typ[String], Integer, false},
2481 {EmptyTypeSet, II, true},
2482 {EmptyTypeSet, EmptyTypeSet, true},
2483 {Typ[Int], EmptyTypeSet, false},
2498 {Bad, EmptyIface, true},
2501 for _, test := range tests {
2502 if got := Implements(test.V, test.T); got != test.want {
2503 t.Errorf("Implements(%s, %s) = %t, want %t", test.V, test.T, got, test.want)
2506 // The type assertion x.(T) is valid if T is an interface or if T implements the type of x.
2507 // The assertion is never valid if T is a bad type.
2511 if _, ok := T.Underlying().(*Interface); (ok || Implements(T, V)) && T != Bad {
2514 if got := AssertableTo(V, T); got != want {
2515 t.Errorf("AssertableTo(%s, %s) = %t, want %t", V, T, got, want)
2520 func TestMissingMethodAlternative(t *testing.T) {
2542 pkg := mustTypecheck("p.go", src, nil, nil)
2544 T := pkg.Scope().Lookup("T").Type().Underlying().(*Interface)
2545 lookup := func(name string) (*Func, bool) {
2546 return MissingMethod(pkg.Scope().Lookup(name).Type(), T, true)
2549 // V0 has method m with correct signature. Should not report wrongType.
2550 method, wrongType := lookup("V0")
2551 if method != nil || wrongType {
2552 t.Fatalf("V0: got method = %v, wrongType = %v", method, wrongType)
2555 checkMissingMethod := func(tname string, reportWrongType bool) {
2556 method, wrongType := lookup(tname)
2557 if method == nil || method.Name() != "m" || wrongType != reportWrongType {
2558 t.Fatalf("%s: got method = %v, wrongType = %v", tname, method, wrongType)
2562 // V1 has no method m. Should not report wrongType.
2563 checkMissingMethod("V1", false)
2565 // V2 has method m with wrong signature type (ignoring receiver). Should report wrongType.
2566 checkMissingMethod("V2", true)
2568 // V3 has no method m but it exists on *V3. Should report wrongType.
2569 checkMissingMethod("V3", true)
2571 // V4 has no method m but has M. Should not report wrongType.
2572 checkMissingMethod("V4", false)