1
2
3
4
5 package types2_test
6
7 import (
8 "bytes"
9 "cmd/compile/internal/syntax"
10 "errors"
11 "fmt"
12 "internal/testenv"
13 "reflect"
14 "regexp"
15 "sort"
16 "strings"
17 "testing"
18
19 . "cmd/compile/internal/types2"
20 )
21
22
23
24
25 const brokenPkg = "package broken_"
26
27 func parseSrc(path, src string) (*syntax.File, error) {
28 errh := func(error) {}
29 return syntax.Parse(syntax.NewFileBase(path), strings.NewReader(src), errh, nil, syntax.AllowGenerics|syntax.AllowMethodTypeParams)
30 }
31
32 func pkgFor(path, source string, info *Info) (*Package, error) {
33 f, err := parseSrc(path, source)
34 if err != nil {
35 return nil, err
36 }
37 conf := Config{Importer: defaultImporter()}
38 return conf.Check(f.PkgName.Value, []*syntax.File{f}, info)
39 }
40
41 func mustTypecheck(t *testing.T, path, source string, info *Info) string {
42 pkg, err := pkgFor(path, source, info)
43 if err != nil {
44 name := path
45 if pkg != nil {
46 name = "package " + pkg.Name()
47 }
48 t.Fatalf("%s: didn't type-check (%s)", name, err)
49 }
50 return pkg.Name()
51 }
52
53 func mayTypecheck(t *testing.T, path, source string, info *Info) (string, error) {
54 f, err := parseSrc(path, source)
55 if f == nil {
56 t.Fatalf("%s: unable to parse: %s", path, err)
57 }
58 conf := Config{
59 Error: func(err error) {},
60 Importer: defaultImporter(),
61 }
62 pkg, err := conf.Check(f.PkgName.Value, []*syntax.File{f}, info)
63 return pkg.Name(), err
64 }
65
66 func TestValuesInfo(t *testing.T) {
67 var tests = []struct {
68 src string
69 expr string
70 typ string
71 val string
72 }{
73 {`package a0; const _ = false`, `false`, `untyped bool`, `false`},
74 {`package a1; const _ = 0`, `0`, `untyped int`, `0`},
75 {`package a2; const _ = 'A'`, `'A'`, `untyped rune`, `65`},
76 {`package a3; const _ = 0.`, `0.`, `untyped float`, `0`},
77 {`package a4; const _ = 0i`, `0i`, `untyped complex`, `(0 + 0i)`},
78 {`package a5; const _ = "foo"`, `"foo"`, `untyped string`, `"foo"`},
79
80 {`package b0; var _ = false`, `false`, `bool`, `false`},
81 {`package b1; var _ = 0`, `0`, `int`, `0`},
82 {`package b2; var _ = 'A'`, `'A'`, `rune`, `65`},
83 {`package b3; var _ = 0.`, `0.`, `float64`, `0`},
84 {`package b4; var _ = 0i`, `0i`, `complex128`, `(0 + 0i)`},
85 {`package b5; var _ = "foo"`, `"foo"`, `string`, `"foo"`},
86
87 {`package c0a; var _ = bool(false)`, `false`, `bool`, `false`},
88 {`package c0b; var _ = bool(false)`, `bool(false)`, `bool`, `false`},
89 {`package c0c; type T bool; var _ = T(false)`, `T(false)`, `c0c.T`, `false`},
90
91 {`package c1a; var _ = int(0)`, `0`, `int`, `0`},
92 {`package c1b; var _ = int(0)`, `int(0)`, `int`, `0`},
93 {`package c1c; type T int; var _ = T(0)`, `T(0)`, `c1c.T`, `0`},
94
95 {`package c2a; var _ = rune('A')`, `'A'`, `rune`, `65`},
96 {`package c2b; var _ = rune('A')`, `rune('A')`, `rune`, `65`},
97 {`package c2c; type T rune; var _ = T('A')`, `T('A')`, `c2c.T`, `65`},
98
99 {`package c3a; var _ = float32(0.)`, `0.`, `float32`, `0`},
100 {`package c3b; var _ = float32(0.)`, `float32(0.)`, `float32`, `0`},
101 {`package c3c; type T float32; var _ = T(0.)`, `T(0.)`, `c3c.T`, `0`},
102
103 {`package c4a; var _ = complex64(0i)`, `0i`, `complex64`, `(0 + 0i)`},
104 {`package c4b; var _ = complex64(0i)`, `complex64(0i)`, `complex64`, `(0 + 0i)`},
105 {`package c4c; type T complex64; var _ = T(0i)`, `T(0i)`, `c4c.T`, `(0 + 0i)`},
106
107 {`package c5a; var _ = string("foo")`, `"foo"`, `string`, `"foo"`},
108 {`package c5b; var _ = string("foo")`, `string("foo")`, `string`, `"foo"`},
109 {`package c5c; type T string; var _ = T("foo")`, `T("foo")`, `c5c.T`, `"foo"`},
110 {`package c5d; var _ = string(65)`, `65`, `untyped int`, `65`},
111 {`package c5e; var _ = string('A')`, `'A'`, `untyped rune`, `65`},
112 {`package c5f; type T string; var _ = T('A')`, `'A'`, `untyped rune`, `65`},
113
114 {`package d0; var _ = []byte("foo")`, `"foo"`, `string`, `"foo"`},
115 {`package d1; var _ = []byte(string("foo"))`, `"foo"`, `string`, `"foo"`},
116 {`package d2; var _ = []byte(string("foo"))`, `string("foo")`, `string`, `"foo"`},
117 {`package d3; type T []byte; var _ = T("foo")`, `"foo"`, `string`, `"foo"`},
118
119 {`package e0; const _ = float32( 1e-200)`, `float32(1e-200)`, `float32`, `0`},
120 {`package e1; const _ = float32(-1e-200)`, `float32(-1e-200)`, `float32`, `0`},
121 {`package e2; const _ = float64( 1e-2000)`, `float64(1e-2000)`, `float64`, `0`},
122 {`package e3; const _ = float64(-1e-2000)`, `float64(-1e-2000)`, `float64`, `0`},
123 {`package e4; const _ = complex64( 1e-200)`, `complex64(1e-200)`, `complex64`, `(0 + 0i)`},
124 {`package e5; const _ = complex64(-1e-200)`, `complex64(-1e-200)`, `complex64`, `(0 + 0i)`},
125 {`package e6; const _ = complex128( 1e-2000)`, `complex128(1e-2000)`, `complex128`, `(0 + 0i)`},
126 {`package e7; const _ = complex128(-1e-2000)`, `complex128(-1e-2000)`, `complex128`, `(0 + 0i)`},
127
128 {`package f0 ; var _ float32 = 1e-200`, `1e-200`, `float32`, `0`},
129 {`package f1 ; var _ float32 = -1e-200`, `-1e-200`, `float32`, `0`},
130 {`package f2a; var _ float64 = 1e-2000`, `1e-2000`, `float64`, `0`},
131 {`package f3a; var _ float64 = -1e-2000`, `-1e-2000`, `float64`, `0`},
132 {`package f2b; var _ = 1e-2000`, `1e-2000`, `float64`, `0`},
133 {`package f3b; var _ = -1e-2000`, `-1e-2000`, `float64`, `0`},
134 {`package f4 ; var _ complex64 = 1e-200 `, `1e-200`, `complex64`, `(0 + 0i)`},
135 {`package f5 ; var _ complex64 = -1e-200 `, `-1e-200`, `complex64`, `(0 + 0i)`},
136 {`package f6a; var _ complex128 = 1e-2000i`, `1e-2000i`, `complex128`, `(0 + 0i)`},
137 {`package f7a; var _ complex128 = -1e-2000i`, `-1e-2000i`, `complex128`, `(0 + 0i)`},
138 {`package f6b; var _ = 1e-2000i`, `1e-2000i`, `complex128`, `(0 + 0i)`},
139 {`package f7b; var _ = -1e-2000i`, `-1e-2000i`, `complex128`, `(0 + 0i)`},
140
141 {`package g0; const (a = len([iota]int{}); b; c); const _ = c`, `c`, `int`, `2`},
142 {`package g1; var(j int32; s int; n = 1.0<<s == j)`, `1.0`, `int32`, `1`},
143 }
144
145 for _, test := range tests {
146 info := Info{
147 Types: make(map[syntax.Expr]TypeAndValue),
148 }
149 name := mustTypecheck(t, "ValuesInfo", test.src, &info)
150
151
152 var expr syntax.Expr
153 for e := range info.Types {
154 if syntax.String(e) == test.expr {
155 expr = e
156 break
157 }
158 }
159 if expr == nil {
160 t.Errorf("package %s: no expression found for %s", name, test.expr)
161 continue
162 }
163 tv := info.Types[expr]
164
165
166 if got := tv.Type.String(); got != test.typ {
167 t.Errorf("package %s: got type %s; want %s", name, got, test.typ)
168 continue
169 }
170
171
172 if tv.Value != nil {
173 if got := tv.Value.ExactString(); got != test.val {
174 t.Errorf("package %s: got value %s; want %s", name, got, test.val)
175 }
176 } else {
177 if test.val != "" {
178 t.Errorf("package %s: no constant found; want %s", name, test.val)
179 }
180 }
181 }
182 }
183
184 func TestTypesInfo(t *testing.T) {
185 var tests = []struct {
186 src string
187 expr string
188 typ string
189 }{
190
191 {`package b0; var x interface{} = false`, `false`, `bool`},
192 {`package b1; var x interface{} = 0`, `0`, `int`},
193 {`package b2; var x interface{} = 0.`, `0.`, `float64`},
194 {`package b3; var x interface{} = 0i`, `0i`, `complex128`},
195 {`package b4; var x interface{} = "foo"`, `"foo"`, `string`},
196
197
198 {`package n0; var _ *int = nil`, `nil`, `*int`},
199 {`package n1; var _ func() = nil`, `nil`, `func()`},
200 {`package n2; var _ []byte = nil`, `nil`, `[]byte`},
201 {`package n3; var _ map[int]int = nil`, `nil`, `map[int]int`},
202 {`package n4; var _ chan int = nil`, `nil`, `chan int`},
203 {`package n5a; var _ interface{} = (*int)(nil)`, `nil`, `*int`},
204 {`package n5b; var _ interface{m()} = nil`, `nil`, `interface{m()}`},
205 {`package n6; import "unsafe"; var _ unsafe.Pointer = nil`, `nil`, `unsafe.Pointer`},
206
207 {`package n10; var (x *int; _ = x == nil)`, `nil`, `*int`},
208 {`package n11; var (x func(); _ = x == nil)`, `nil`, `func()`},
209 {`package n12; var (x []byte; _ = x == nil)`, `nil`, `[]byte`},
210 {`package n13; var (x map[int]int; _ = x == nil)`, `nil`, `map[int]int`},
211 {`package n14; var (x chan int; _ = x == nil)`, `nil`, `chan int`},
212 {`package n15a; var (x interface{}; _ = x == (*int)(nil))`, `nil`, `*int`},
213 {`package n15b; var (x interface{m()}; _ = x == nil)`, `nil`, `interface{m()}`},
214 {`package n15; import "unsafe"; var (x unsafe.Pointer; _ = x == nil)`, `nil`, `unsafe.Pointer`},
215
216 {`package n20; var _ = (*int)(nil)`, `nil`, `*int`},
217 {`package n21; var _ = (func())(nil)`, `nil`, `func()`},
218 {`package n22; var _ = ([]byte)(nil)`, `nil`, `[]byte`},
219 {`package n23; var _ = (map[int]int)(nil)`, `nil`, `map[int]int`},
220 {`package n24; var _ = (chan int)(nil)`, `nil`, `chan int`},
221 {`package n25a; var _ = (interface{})((*int)(nil))`, `nil`, `*int`},
222 {`package n25b; var _ = (interface{m()})(nil)`, `nil`, `interface{m()}`},
223 {`package n26; import "unsafe"; var _ = unsafe.Pointer(nil)`, `nil`, `unsafe.Pointer`},
224
225 {`package n30; func f(*int) { f(nil) }`, `nil`, `*int`},
226 {`package n31; func f(func()) { f(nil) }`, `nil`, `func()`},
227 {`package n32; func f([]byte) { f(nil) }`, `nil`, `[]byte`},
228 {`package n33; func f(map[int]int) { f(nil) }`, `nil`, `map[int]int`},
229 {`package n34; func f(chan int) { f(nil) }`, `nil`, `chan int`},
230 {`package n35a; func f(interface{}) { f((*int)(nil)) }`, `nil`, `*int`},
231 {`package n35b; func f(interface{m()}) { f(nil) }`, `nil`, `interface{m()}`},
232 {`package n35; import "unsafe"; func f(unsafe.Pointer) { f(nil) }`, `nil`, `unsafe.Pointer`},
233
234
235 {`package p0; var x interface{}; var _, _ = x.(int)`,
236 `x.(int)`,
237 `(int, bool)`,
238 },
239 {`package p1; var x interface{}; func _() { _, _ = x.(int) }`,
240 `x.(int)`,
241 `(int, bool)`,
242 },
243 {`package p2a; type mybool bool; var m map[string]complex128; var b mybool; func _() { _, b = m["foo"] }`,
244 `m["foo"]`,
245 `(complex128, p2a.mybool)`,
246 },
247 {`package p2b; var m map[string]complex128; var b bool; func _() { _, b = m["foo"] }`,
248 `m["foo"]`,
249 `(complex128, bool)`,
250 },
251 {`package p3; var c chan string; var _, _ = <-c`,
252 `<-c`,
253 `(string, bool)`,
254 },
255
256
257 {`package issue6796_a; var x interface{}; var _, _ = (x.(int))`,
258 `x.(int)`,
259 `(int, bool)`,
260 },
261 {`package issue6796_b; var c chan string; var _, _ = (<-c)`,
262 `(<-c)`,
263 `(string, bool)`,
264 },
265 {`package issue6796_c; var c chan string; var _, _ = (<-c)`,
266 `<-c`,
267 `(string, bool)`,
268 },
269 {`package issue6796_d; var c chan string; var _, _ = ((<-c))`,
270 `(<-c)`,
271 `(string, bool)`,
272 },
273 {`package issue6796_e; func f(c chan string) { _, _ = ((<-c)) }`,
274 `(<-c)`,
275 `(string, bool)`,
276 },
277
278
279 {`package issue7060_a; var ( m map[int]string; x, ok = m[0] )`,
280 `m[0]`,
281 `(string, bool)`,
282 },
283 {`package issue7060_b; var ( m map[int]string; x, ok interface{} = m[0] )`,
284 `m[0]`,
285 `(string, bool)`,
286 },
287 {`package issue7060_c; func f(x interface{}, ok bool, m map[int]string) { x, ok = m[0] }`,
288 `m[0]`,
289 `(string, bool)`,
290 },
291 {`package issue7060_d; var ( ch chan string; x, ok = <-ch )`,
292 `<-ch`,
293 `(string, bool)`,
294 },
295 {`package issue7060_e; var ( ch chan string; x, ok interface{} = <-ch )`,
296 `<-ch`,
297 `(string, bool)`,
298 },
299 {`package issue7060_f; func f(x interface{}, ok bool, ch chan string) { x, ok = <-ch }`,
300 `<-ch`,
301 `(string, bool)`,
302 },
303
304
305 {`package issue28277_a; func f(...int)`,
306 `...int`,
307 `[]int`,
308 },
309 {`package issue28277_b; func f(a, b int, c ...[]struct{})`,
310 `...[]struct{}`,
311 `[][]struct{}`,
312 },
313
314
315 {brokenPkg + `x0; func _() { var x struct {f string}; x.f := 0 }`, `x.f`, `string`},
316 {brokenPkg + `x1; func _() { var z string; type x struct {f string}; y := &x{q: z}}`, `z`, `string`},
317 {brokenPkg + `x2; func _() { var a, b string; type x struct {f string}; z := &x{f: a, f: b,}}`, `b`, `string`},
318 {brokenPkg + `x3; var x = panic("");`, `panic`, `func(interface{})`},
319 {`package x4; func _() { panic("") }`, `panic`, `func(interface{})`},
320 {brokenPkg + `x5; func _() { var x map[string][...]int; x = map[string][...]int{"": {1,2,3}} }`, `x`, `map[string]invalid type`},
321
322
323 {`package p0; func f[T any](T) {}; var _ = f[int]`, `f`, `func[T any](T)`},
324 {`package p1; func f[T any](T) {}; var _ = f[int]`, `f[int]`, `func(int)`},
325 {`package p2; func f[T any](T) {}; func _() { f(42) }`, `f`, `func(int)`},
326 {`package p3; func f[T any](T) {}; func _() { f[int](42) }`, `f[int]`, `func(int)`},
327 {`package p4; func f[T any](T) {}; func _() { f[int](42) }`, `f`, `func[T any](T)`},
328 {`package p5; func f[T any](T) {}; func _() { f(42) }`, `f(42)`, `()`},
329
330
331 {`package t0; type t[] int; var _ t`, `t`, `t0.t`},
332 {`package t1; type t[P any] int; var _ t[int]`, `t`, `t1.t[P any]`},
333 {`package t2; type t[P interface{}] int; var _ t[int]`, `t`, `t2.t[P interface{}]`},
334 {`package t3; type t[P, Q interface{}] int; var _ t[int, int]`, `t`, `t3.t[P, Q interface{}]`},
335 {brokenPkg + `t4; type t[P, Q interface{ m() }] int; var _ t[int, int]`, `t`, `broken_t4.t[P, Q interface{m()}]`},
336
337
338 {`package g0; type t[P any] int; var x struct{ f t[int] }; var _ = x.f`, `x.f`, `g0.t[int]`},
339
340
341 {`package issue45096; func _[T interface{ ~int8 | ~int16 | ~int32 }](x T) { _ = x < 0 }`, `0`, `T`},
342
343
344 {`package p; import "unsafe"; type S struct { f int }; var s S; var _ = unsafe.Offsetof(s.f)`, `s.f`, `int`},
345
346
347 {`package u0a; func _[_ interface{int}]() {}`, `int`, `int`},
348 {`package u1a; func _[_ interface{~int}]() {}`, `~int`, `~int`},
349 {`package u2a; func _[_ interface{int|string}]() {}`, `int | string`, `int|string`},
350 {`package u3a; func _[_ interface{int|string|~bool}]() {}`, `int | string | ~bool`, `int|string|~bool`},
351 {`package u3a; func _[_ interface{int|string|~bool}]() {}`, `int | string`, `int|string`},
352 {`package u3a; func _[_ interface{int|string|~bool}]() {}`, `~bool`, `~bool`},
353 {`package u3a; func _[_ interface{int|string|~float64|~bool}]() {}`, `int | string | ~float64`, `int|string|~float64`},
354
355 {`package u0b; func _[_ int]() {}`, `int`, `int`},
356 {`package u1b; func _[_ ~int]() {}`, `~int`, `~int`},
357 {`package u2b; func _[_ int|string]() {}`, `int | string`, `int|string`},
358 {`package u3b; func _[_ int|string|~bool]() {}`, `int | string | ~bool`, `int|string|~bool`},
359 {`package u3b; func _[_ int|string|~bool]() {}`, `int | string`, `int|string`},
360 {`package u3b; func _[_ int|string|~bool]() {}`, `~bool`, `~bool`},
361 {`package u3b; func _[_ int|string|~float64|~bool]() {}`, `int | string | ~float64`, `int|string|~float64`},
362
363 {`package u0c; type _ interface{int}`, `int`, `int`},
364 {`package u1c; type _ interface{~int}`, `~int`, `~int`},
365 {`package u2c; type _ interface{int|string}`, `int | string`, `int|string`},
366 {`package u3c; type _ interface{int|string|~bool}`, `int | string | ~bool`, `int|string|~bool`},
367 {`package u3c; type _ interface{int|string|~bool}`, `int | string`, `int|string`},
368 {`package u3c; type _ interface{int|string|~bool}`, `~bool`, `~bool`},
369 {`package u3c; type _ interface{int|string|~float64|~bool}`, `int | string | ~float64`, `int|string|~float64`},
370 }
371
372 for _, test := range tests {
373 info := Info{Types: make(map[syntax.Expr]TypeAndValue)}
374 var name string
375 if strings.HasPrefix(test.src, brokenPkg) {
376 var err error
377 name, err = mayTypecheck(t, "TypesInfo", test.src, &info)
378 if err == nil {
379 t.Errorf("package %s: expected to fail but passed", name)
380 continue
381 }
382 } else {
383 name = mustTypecheck(t, "TypesInfo", test.src, &info)
384 }
385
386
387 var typ Type
388 for e, tv := range info.Types {
389 if syntax.String(e) == test.expr {
390 typ = tv.Type
391 break
392 }
393 }
394 if typ == nil {
395 t.Errorf("package %s: no type found for %s", name, test.expr)
396 continue
397 }
398
399
400 if got := typ.String(); got != test.typ {
401 t.Errorf("package %s: got %s; want %s", name, got, test.typ)
402 }
403 }
404 }
405
406 func TestInstanceInfo(t *testing.T) {
407 const lib = `package lib
408
409 func F[P any](P) {}
410
411 type T[P any] []P
412 `
413
414 type testInst struct {
415 name string
416 targs []string
417 typ string
418 }
419
420 var tests = []struct {
421 src string
422 instances []testInst
423 }{
424 {`package p0; func f[T any](T) {}; func _() { f(42) }`,
425 []testInst{{`f`, []string{`int`}, `func(int)`}},
426 },
427 {`package p1; func f[T any](T) T { panic(0) }; func _() { f('@') }`,
428 []testInst{{`f`, []string{`rune`}, `func(rune) rune`}},
429 },
430 {`package p2; func f[T any](...T) T { panic(0) }; func _() { f(0i) }`,
431 []testInst{{`f`, []string{`complex128`}, `func(...complex128) complex128`}},
432 },
433 {`package p3; func f[A, B, C any](A, *B, []C) {}; func _() { f(1.2, new(string), []byte{}) }`,
434 []testInst{{`f`, []string{`float64`, `string`, `byte`}, `func(float64, *string, []byte)`}},
435 },
436 {`package p4; func f[A, B any](A, *B, ...[]B) {}; func _() { f(1.2, new(byte)) }`,
437 []testInst{{`f`, []string{`float64`, `byte`}, `func(float64, *byte, ...[]byte)`}},
438 },
439
440 {`package q0; type T struct{}; func (T) m[P any](P) {}; func _(x T) { x.m(42) }`,
441 []testInst{{`m`, []string{`int`}, `func(int)`}},
442 },
443 {`package q1; type T struct{}; func (T) m[P any](P) P { panic(0) }; func _(x T) { x.m(42) }`,
444 []testInst{{`m`, []string{`int`}, `func(int) int`}},
445 },
446 {`package q2; type T struct{}; func (T) m[P any](...P) P { panic(0) }; func _(x T) { x.m(42) }`,
447 []testInst{{`m`, []string{`int`}, `func(...int) int`}},
448 },
449 {`package q3; type T struct{}; func (T) m[A, B, C any](A, *B, []C) {}; func _(x T) { x.m(1.2, new(string), []byte{}) }`,
450 []testInst{{`m`, []string{`float64`, `string`, `byte`}, `func(float64, *string, []byte)`}},
451 },
452 {`package q4; type T struct{}; func (T) m[A, B any](A, *B, ...[]B) {}; func _(x T) { x.m(1.2, new(byte)) }`,
453 []testInst{{`m`, []string{`float64`, `byte`}, `func(float64, *byte, ...[]byte)`}},
454 },
455
456 {`package r0; type T[P1 any] struct{}; func (_ T[P2]) m[Q any](Q) {}; func _[P3 any](x T[P3]) { x.m(42) }`,
457 []testInst{
458 {`T`, []string{`P2`}, `struct{}`},
459 {`T`, []string{`P3`}, `struct{}`},
460 {`m`, []string{`int`}, `func(int)`},
461 },
462 },
463
464
465
466
467
468
469
470 {`package s1; func f[T any, P interface{*T}](x T) {}; func _(x string) { f(x) }`,
471 []testInst{{`f`, []string{`string`, `*string`}, `func(x string)`}},
472 },
473 {`package s2; func f[T any, P interface{*T}](x []T) {}; func _(x []int) { f(x) }`,
474 []testInst{{`f`, []string{`int`, `*int`}, `func(x []int)`}},
475 },
476 {`package s3; type C[T any] interface{chan<- T}; func f[T any, P C[T]](x []T) {}; func _(x []int) { f(x) }`,
477 []testInst{
478 {`C`, []string{`T`}, `interface{chan<- T}`},
479 {`f`, []string{`int`, `chan<- int`}, `func(x []int)`},
480 },
481 },
482 {`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) }`,
483 []testInst{
484 {`C`, []string{`T`}, `interface{chan<- T}`},
485 {`C`, []string{`[]*P`}, `interface{chan<- []*P}`},
486 {`f`, []string{`int`, `chan<- int`, `chan<- []*chan<- int`}, `func(x []int)`},
487 },
488 },
489
490 {`package t1; func f[T any, P interface{*T}]() T { panic(0) }; func _() { _ = f[string] }`,
491 []testInst{{`f`, []string{`string`, `*string`}, `func() string`}},
492 },
493 {`package t2; func f[T any, P interface{*T}]() T { panic(0) }; func _() { _ = (f[string]) }`,
494 []testInst{{`f`, []string{`string`, `*string`}, `func() string`}},
495 },
496 {`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] }`,
497 []testInst{
498 {`C`, []string{`T`}, `interface{chan<- T}`},
499 {`C`, []string{`[]*P`}, `interface{chan<- []*P}`},
500 {`f`, []string{`int`, `chan<- int`, `chan<- []*chan<- int`}, `func() []int`},
501 },
502 },
503 {`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]) }`,
504 []testInst{
505 {`C`, []string{`T`}, `interface{chan<- T}`},
506 {`C`, []string{`[]*P`}, `interface{chan<- []*P}`},
507 {`f`, []string{`int`, `chan<- int`, `chan<- []*chan<- int`}, `func() []int`},
508 },
509 },
510 {`package i0; import "lib"; func _() { lib.F(42) }`,
511 []testInst{{`F`, []string{`int`}, `func(int)`}},
512 },
513
514 {`package duplfunc0; func f[T any](T) {}; func _() { f(42); f("foo"); f[int](3) }`,
515 []testInst{
516 {`f`, []string{`int`}, `func(int)`},
517 {`f`, []string{`string`}, `func(string)`},
518 {`f`, []string{`int`}, `func(int)`},
519 },
520 },
521 {`package duplfunc1; import "lib"; func _() { lib.F(42); lib.F("foo"); lib.F(3) }`,
522 []testInst{
523 {`F`, []string{`int`}, `func(int)`},
524 {`F`, []string{`string`}, `func(string)`},
525 {`F`, []string{`int`}, `func(int)`},
526 },
527 },
528
529 {`package type0; type T[P interface{~int}] struct{ x P }; var _ T[int]`,
530 []testInst{{`T`, []string{`int`}, `struct{x int}`}},
531 },
532 {`package type1; type T[P interface{~int}] struct{ x P }; var _ (T[int])`,
533 []testInst{{`T`, []string{`int`}, `struct{x int}`}},
534 },
535 {`package type2; type T[P interface{~int}] struct{ x P }; var _ T[(int)]`,
536 []testInst{{`T`, []string{`int`}, `struct{x int}`}},
537 },
538 {`package type3; type T[P1 interface{~[]P2}, P2 any] struct{ x P1; y P2 }; var _ T[[]int, int]`,
539 []testInst{{`T`, []string{`[]int`, `int`}, `struct{x []int; y int}`}},
540 },
541 {`package type4; import "lib"; var _ lib.T[int]`,
542 []testInst{{`T`, []string{`int`}, `[]int`}},
543 },
544
545 {`package dupltype0; type T[P interface{~int}] struct{ x P }; var x T[int]; var y T[int]`,
546 []testInst{
547 {`T`, []string{`int`}, `struct{x int}`},
548 {`T`, []string{`int`}, `struct{x int}`},
549 },
550 },
551 {`package dupltype1; type T[P ~int] struct{ x P }; func (r *T[Q]) add(z T[Q]) { r.x += z.x }`,
552 []testInst{
553 {`T`, []string{`Q`}, `struct{x Q}`},
554 {`T`, []string{`Q`}, `struct{x Q}`},
555 },
556 },
557 {`package dupltype1; import "lib"; var x lib.T[int]; var y lib.T[int]; var z lib.T[string]`,
558 []testInst{
559 {`T`, []string{`int`}, `[]int`},
560 {`T`, []string{`int`}, `[]int`},
561 {`T`, []string{`string`}, `[]string`},
562 },
563 },
564 }
565
566 for _, test := range tests {
567 imports := make(testImporter)
568 conf := Config{Importer: imports}
569 instMap := make(map[*syntax.Name]Instance)
570 useMap := make(map[*syntax.Name]Object)
571 makePkg := func(src string) *Package {
572 f, err := parseSrc("p.go", src)
573 if err != nil {
574 t.Fatal(err)
575 }
576 pkg, err := conf.Check("", []*syntax.File{f}, &Info{Instances: instMap, Uses: useMap})
577 if err != nil {
578 t.Fatal(err)
579 }
580 imports[pkg.Name()] = pkg
581 return pkg
582 }
583 makePkg(lib)
584 pkg := makePkg(test.src)
585
586 t.Run(pkg.Name(), func(t *testing.T) {
587
588 instances := sortedInstances(instMap)
589 if got, want := len(instances), len(test.instances); got != want {
590 t.Fatalf("got %d instances, want %d", got, want)
591 }
592
593
594 for ii, inst := range instances {
595 var targs []Type
596 for i := 0; i < inst.Inst.TypeArgs.Len(); i++ {
597 targs = append(targs, inst.Inst.TypeArgs.At(i))
598 }
599 typ := inst.Inst.Type
600
601 testInst := test.instances[ii]
602 if got := inst.Name.Value; got != testInst.name {
603 t.Fatalf("got name %s, want %s", got, testInst.name)
604 }
605
606 if len(targs) != len(testInst.targs) {
607 t.Fatalf("got %d type arguments; want %d", len(targs), len(testInst.targs))
608 }
609 for i, targ := range targs {
610 if got := targ.String(); got != testInst.targs[i] {
611 t.Errorf("type argument %d: got %s; want %s", i, got, testInst.targs[i])
612 }
613 }
614 if got := typ.Underlying().String(); got != testInst.typ {
615 t.Errorf("package %s: got %s; want %s", pkg.Name(), got, testInst.typ)
616 }
617
618
619
620 ptype := useMap[inst.Name].Type()
621 lister, _ := ptype.(interface{ TypeParams() *TypeParamList })
622 if lister == nil || lister.TypeParams().Len() == 0 {
623 t.Fatalf("info.Types[%v] = %v, want parameterized type", inst.Name, ptype)
624 }
625 inst2, err := Instantiate(nil, ptype, targs, true)
626 if err != nil {
627 t.Errorf("Instantiate(%v, %v) failed: %v", ptype, targs, err)
628 }
629 if !Identical(inst.Inst.Type, inst2) {
630 t.Errorf("%v and %v are not identical", inst.Inst.Type, inst2)
631 }
632 }
633 })
634 }
635 }
636
637 type recordedInstance struct {
638 Name *syntax.Name
639 Inst Instance
640 }
641
642 func sortedInstances(m map[*syntax.Name]Instance) (instances []recordedInstance) {
643 for id, inst := range m {
644 instances = append(instances, recordedInstance{id, inst})
645 }
646 sort.Slice(instances, func(i, j int) bool {
647 return instances[i].Name.Pos().Cmp(instances[j].Name.Pos()) < 0
648 })
649 return instances
650 }
651
652 func TestDefsInfo(t *testing.T) {
653 var tests = []struct {
654 src string
655 obj string
656 want string
657 }{
658 {`package p0; const x = 42`, `x`, `const p0.x untyped int`},
659 {`package p1; const x int = 42`, `x`, `const p1.x int`},
660 {`package p2; var x int`, `x`, `var p2.x int`},
661 {`package p3; type x int`, `x`, `type p3.x int`},
662 {`package p4; func f()`, `f`, `func p4.f()`},
663 {`package p5; func f() int { x, _ := 1, 2; return x }`, `_`, `var _ int`},
664
665
666 {`package g0; type x[T any] int`, `x`, `type g0.x[T any] int`},
667 {`package g1; func f[T any]() {}`, `f`, `func g1.f[T any]()`},
668 {`package g2; type x[T any] int; func (*x[_]) m() {}`, `m`, `func (*g2.x[_]).m()`},
669 }
670
671 for _, test := range tests {
672 info := Info{
673 Defs: make(map[*syntax.Name]Object),
674 }
675 name := mustTypecheck(t, "DefsInfo", test.src, &info)
676
677
678 var def Object
679 for id, obj := range info.Defs {
680 if id.Value == test.obj {
681 def = obj
682 break
683 }
684 }
685 if def == nil {
686 t.Errorf("package %s: %s not found", name, test.obj)
687 continue
688 }
689
690 if got := def.String(); got != test.want {
691 t.Errorf("package %s: got %s; want %s", name, got, test.want)
692 }
693 }
694 }
695
696 func TestUsesInfo(t *testing.T) {
697 var tests = []struct {
698 src string
699 obj string
700 want string
701 }{
702 {`package p0; func _() { _ = x }; const x = 42`, `x`, `const p0.x untyped int`},
703 {`package p1; func _() { _ = x }; const x int = 42`, `x`, `const p1.x int`},
704 {`package p2; func _() { _ = x }; var x int`, `x`, `var p2.x int`},
705 {`package p3; func _() { type _ x }; type x int`, `x`, `type p3.x int`},
706 {`package p4; func _() { _ = f }; func f()`, `f`, `func p4.f()`},
707
708
709 {`package g0; func _[T any]() { _ = x }; const x = 42`, `x`, `const g0.x untyped int`},
710 {`package g1; func _[T any](x T) { }`, `T`, `type parameter T any`},
711 {`package g2; type N[A any] int; var _ N[int]`, `N`, `type g2.N[A any] int`},
712 {`package g3; type N[A any] int; func (N[_]) m() {}`, `N`, `type g3.N[A any] int`},
713
714
715 {`package s1; type N[A any] struct{ a A }; var f = N[int]{}.a`, `a`, `field a int`},
716 {`package s1; type N[A any] struct{ a A }; func (r N[B]) m(b B) { r.a = b }`, `a`, `field a B`},
717
718
719 {`package m0; type N[A any] int; func (r N[B]) m() { r.n() }; func (N[C]) n() {}`, `n`, `func (m0.N[B]).n()`},
720 {`package m1; type N[A any] int; func (r N[B]) m() { }; var f = N[int].m`, `m`, `func (m1.N[int]).m()`},
721 {`package m2; func _[A any](v interface{ m() A }) { v.m() }`, `m`, `func (interface).m() A`},
722 {`package m3; func f[A any]() interface{ m() A } { return nil }; var _ = f[int]().m()`, `m`, `func (interface).m() int`},
723 {`package m4; type T[A any] func() interface{ m() A }; var x T[int]; var y = x().m`, `m`, `func (interface).m() int`},
724 {`package m5; type T[A any] interface{ m() A }; func _[B any](t T[B]) { t.m() }`, `m`, `func (m5.T[B]).m() B`},
725 {`package m6; type T[A any] interface{ m() }; func _[B any](t T[B]) { t.m() }`, `m`, `func (m6.T[B]).m()`},
726 {`package m7; type T[A any] interface{ m() A }; func _(t T[int]) { t.m() }`, `m`, `func (m7.T[int]).m() int`},
727 {`package m8; type T[A any] interface{ m() }; func _(t T[int]) { t.m() }`, `m`, `func (m8.T[int]).m()`},
728 {`package m9; type T[A any] interface{ m() }; func _(t T[int]) { _ = t.m }`, `m`, `func (m9.T[int]).m()`},
729 {
730 `package m10; type E[A any] interface{ m() }; type T[B any] interface{ E[B]; n() }; func _(t T[int]) { t.m() }`,
731 `m`,
732 `func (m10.E[int]).m()`,
733 },
734 }
735
736 for _, test := range tests {
737 info := Info{
738 Uses: make(map[*syntax.Name]Object),
739 }
740 name := mustTypecheck(t, "UsesInfo", test.src, &info)
741
742
743 var use Object
744 for id, obj := range info.Uses {
745 if id.Value == test.obj {
746 if use != nil {
747 panic(fmt.Sprintf("multiple uses of %q", id.Value))
748 }
749 use = obj
750 }
751 }
752 if use == nil {
753 t.Errorf("package %s: %s not found", name, test.obj)
754 continue
755 }
756
757 if got := use.String(); got != test.want {
758 t.Errorf("package %s: got %s; want %s", name, got, test.want)
759 }
760 }
761 }
762
763 func TestGenericMethodInfo(t *testing.T) {
764 src := `package p
765
766 type N[A any] int
767
768 func (r N[B]) m() { r.m(); r.n() }
769
770 func (r *N[C]) n() { }
771 `
772 f, err := parseSrc("p.go", src)
773 if err != nil {
774 t.Fatal(err)
775 }
776 info := Info{
777 Defs: make(map[*syntax.Name]Object),
778 Uses: make(map[*syntax.Name]Object),
779 Selections: make(map[*syntax.SelectorExpr]*Selection),
780 }
781 var conf Config
782 pkg, err := conf.Check("p", []*syntax.File{f}, &info)
783 if err != nil {
784 t.Fatal(err)
785 }
786
787 N := pkg.Scope().Lookup("N").Type().(*Named)
788
789
790 gm, gn := N.Method(0), N.Method(1)
791 if gm.Name() == "n" {
792 gm, gn = gn, gm
793 }
794
795
796 var dm, dn *Func
797 var dmm, dmn *Func
798 for _, decl := range f.DeclList {
799 fdecl, ok := decl.(*syntax.FuncDecl)
800 if !ok {
801 continue
802 }
803 def := info.Defs[fdecl.Name].(*Func)
804 switch fdecl.Name.Value {
805 case "m":
806 dm = def
807 syntax.Inspect(fdecl.Body, func(n syntax.Node) bool {
808 if call, ok := n.(*syntax.CallExpr); ok {
809 sel := call.Fun.(*syntax.SelectorExpr)
810 use := info.Uses[sel.Sel].(*Func)
811 selection := info.Selections[sel]
812 if selection.Kind() != MethodVal {
813 t.Errorf("Selection kind = %v, want %v", selection.Kind(), MethodVal)
814 }
815 if selection.Obj() != use {
816 t.Errorf("info.Selections contains %v, want %v", selection.Obj(), use)
817 }
818 switch sel.Sel.Value {
819 case "m":
820 dmm = use
821 case "n":
822 dmn = use
823 }
824 }
825 return true
826 })
827 case "n":
828 dn = def
829 }
830 }
831
832 if gm != dm {
833 t.Errorf(`N.Method(...) returns %v for "m", but Info.Defs has %v`, gm, dm)
834 }
835 if gn != dn {
836 t.Errorf(`N.Method(...) returns %v for "m", but Info.Defs has %v`, gm, dm)
837 }
838 if dmm != dm {
839 t.Errorf(`Inside "m", r.m uses %v, want the defined func %v`, dmm, dm)
840 }
841 if dmn == dn {
842 t.Errorf(`Inside "m", r.n uses %v, want a func distinct from %v`, dmm, dm)
843 }
844 }
845
846 func TestImplicitsInfo(t *testing.T) {
847 testenv.MustHaveGoBuild(t)
848
849 var tests = []struct {
850 src string
851 want string
852 }{
853 {`package p2; import . "fmt"; var _ = Println`, ""},
854 {`package p0; import local "fmt"; var _ = local.Println`, ""},
855 {`package p1; import "fmt"; var _ = fmt.Println`, "importSpec: package fmt"},
856
857 {`package p3; func f(x interface{}) { switch x.(type) { case int: } }`, ""},
858 {`package p4; func f(x interface{}) { switch t := x.(type) { case int: _ = t } }`, "caseClause: var t int"},
859 {`package p5; func f(x interface{}) { switch t := x.(type) { case int, uint: _ = t } }`, "caseClause: var t interface{}"},
860 {`package p6; func f(x interface{}) { switch t := x.(type) { default: _ = t } }`, "caseClause: var t interface{}"},
861
862 {`package p7; func f(x int) {}`, ""},
863 {`package p8; func f(int) {}`, "field: var int"},
864 {`package p9; func f() (complex64) { return 0 }`, "field: var complex64"},
865 {`package p10; type T struct{}; func (*T) f() {}`, "field: var *p10.T"},
866
867
868 {`package f0; func f[T any](x int) {}`, ""},
869 {`package f1; func f[T any](int) {}`, "field: var int"},
870 {`package f2; func f[T any](T) {}`, "field: var T"},
871 {`package f3; func f[T any]() (complex64) { return 0 }`, "field: var complex64"},
872 {`package f4; func f[T any](t T) (T) { return t }`, "field: var T"},
873 {`package t0; type T[A any] struct{}; func (*T[_]) f() {}`, "field: var *t0.T[_]"},
874 {`package t1; type T[A any] struct{}; func _(x interface{}) { switch t := x.(type) { case T[int]: _ = t } }`, "caseClause: var t t1.T[int]"},
875 {`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]"},
876 {`package t3; func _[P any](x interface{}) { switch t := x.(type) { case P: _ = t } }`, "caseClause: var t P"},
877 }
878
879 for _, test := range tests {
880 info := Info{
881 Implicits: make(map[syntax.Node]Object),
882 }
883 name := mustTypecheck(t, "ImplicitsInfo", test.src, &info)
884
885
886 if len(info.Implicits) > 1 {
887 t.Errorf("package %s: %d Implicits entries found", name, len(info.Implicits))
888 continue
889 }
890
891
892 var got string
893 for n, obj := range info.Implicits {
894 switch x := n.(type) {
895 case *syntax.ImportDecl:
896 got = "importSpec"
897 case *syntax.CaseClause:
898 got = "caseClause"
899 case *syntax.Field:
900 got = "field"
901 default:
902 t.Fatalf("package %s: unexpected %T", name, x)
903 }
904 got += ": " + obj.String()
905 }
906
907
908 if got != test.want {
909 t.Errorf("package %s: got %q; want %q", name, got, test.want)
910 }
911 }
912 }
913
914 func predString(tv TypeAndValue) string {
915 var buf bytes.Buffer
916 pred := func(b bool, s string) {
917 if b {
918 if buf.Len() > 0 {
919 buf.WriteString(", ")
920 }
921 buf.WriteString(s)
922 }
923 }
924
925 pred(tv.IsVoid(), "void")
926 pred(tv.IsType(), "type")
927 pred(tv.IsBuiltin(), "builtin")
928 pred(tv.IsValue() && tv.Value != nil, "const")
929 pred(tv.IsValue() && tv.Value == nil, "value")
930 pred(tv.IsNil(), "nil")
931 pred(tv.Addressable(), "addressable")
932 pred(tv.Assignable(), "assignable")
933 pred(tv.HasOk(), "hasOk")
934
935 if buf.Len() == 0 {
936 return "invalid"
937 }
938 return buf.String()
939 }
940
941 func TestPredicatesInfo(t *testing.T) {
942 testenv.MustHaveGoBuild(t)
943
944 var tests = []struct {
945 src string
946 expr string
947 pred string
948 }{
949
950 {`package n0; func f() { f() }`, `f()`, `void`},
951
952
953 {`package t0; type _ int`, `int`, `type`},
954 {`package t1; type _ []int`, `[]int`, `type`},
955 {`package t2; type _ func()`, `func()`, `type`},
956 {`package t3; type _ func(int)`, `int`, `type`},
957 {`package t3; type _ func(...int)`, `...int`, `type`},
958
959
960 {`package b0; var _ = len("")`, `len`, `builtin`},
961 {`package b1; var _ = (len)("")`, `(len)`, `builtin`},
962
963
964 {`package c0; var _ = 42`, `42`, `const`},
965 {`package c1; var _ = "foo" + "bar"`, `"foo" + "bar"`, `const`},
966 {`package c2; const (i = 1i; _ = i)`, `i`, `const`},
967
968
969 {`package v0; var (a, b int; _ = a + b)`, `a + b`, `value`},
970 {`package v1; var _ = &[]int{1}`, `[]int{…}`, `value`},
971 {`package v2; var _ = func(){}`, `func() {}`, `value`},
972 {`package v4; func f() { _ = f }`, `f`, `value`},
973 {`package v3; var _ *int = nil`, `nil`, `value, nil`},
974 {`package v3; var _ *int = (nil)`, `(nil)`, `value, nil`},
975
976
977 {`package a0; var (x int; _ = x)`, `x`, `value, addressable, assignable`},
978 {`package a1; var (p *int; _ = *p)`, `*p`, `value, addressable, assignable`},
979 {`package a2; var (s []int; _ = s[0])`, `s[0]`, `value, addressable, assignable`},
980 {`package a3; var (s struct{f int}; _ = s.f)`, `s.f`, `value, addressable, assignable`},
981 {`package a4; var (a [10]int; _ = a[0])`, `a[0]`, `value, addressable, assignable`},
982 {`package a5; func _(x int) { _ = x }`, `x`, `value, addressable, assignable`},
983 {`package a6; func _()(x int) { _ = x; return }`, `x`, `value, addressable, assignable`},
984 {`package a7; type T int; func (x T) _() { _ = x }`, `x`, `value, addressable, assignable`},
985
986
987
988 {`package s0; var (m map[int]int; _ = m[0])`, `m[0]`, `value, assignable, hasOk`},
989 {`package s1; var (m map[int]int; _, _ = m[0])`, `m[0]`, `value, assignable, hasOk`},
990
991
992 {`package k0; var (ch chan int; _ = <-ch)`, `<-ch`, `value, hasOk`},
993 {`package k1; var (ch chan int; _, _ = <-ch)`, `<-ch`, `value, hasOk`},
994
995
996
997
998 {`package m0; import "os"; func _() { _ = os.Stdout }`, `os`, `<missing>`},
999 {`package m1; import p "os"; func _() { _ = p.Stdout }`, `p`, `<missing>`},
1000 {`package m2; const c = 0`, `c`, `<missing>`},
1001 {`package m3; type T int`, `T`, `<missing>`},
1002 {`package m4; var v int`, `v`, `<missing>`},
1003 {`package m5; func f() {}`, `f`, `<missing>`},
1004 {`package m6; func _(x int) {}`, `x`, `<missing>`},
1005 {`package m6; func _()(x int) { return }`, `x`, `<missing>`},
1006 {`package m6; type T int; func (x T) _() {}`, `x`, `<missing>`},
1007 }
1008
1009 for _, test := range tests {
1010 info := Info{Types: make(map[syntax.Expr]TypeAndValue)}
1011 name := mustTypecheck(t, "PredicatesInfo", test.src, &info)
1012
1013
1014 got := "<missing>"
1015 for e, tv := range info.Types {
1016
1017 if syntax.String(e) == test.expr {
1018 got = predString(tv)
1019 break
1020 }
1021 }
1022
1023 if got != test.pred {
1024 t.Errorf("package %s: got %s; want %s", name, got, test.pred)
1025 }
1026 }
1027 }
1028
1029 func TestScopesInfo(t *testing.T) {
1030 testenv.MustHaveGoBuild(t)
1031
1032 var tests = []struct {
1033 src string
1034 scopes []string
1035 }{
1036 {`package p0`, []string{
1037 "file:",
1038 }},
1039 {`package p1; import ( "fmt"; m "math"; _ "os" ); var ( _ = fmt.Println; _ = m.Pi )`, []string{
1040 "file:fmt m",
1041 }},
1042 {`package p2; func _() {}`, []string{
1043 "file:", "func:",
1044 }},
1045 {`package p3; func _(x, y int) {}`, []string{
1046 "file:", "func:x y",
1047 }},
1048 {`package p4; func _(x, y int) { x, z := 1, 2; _ = z }`, []string{
1049 "file:", "func:x y z",
1050 }},
1051 {`package p5; func _(x, y int) (u, _ int) { return }`, []string{
1052 "file:", "func:u x y",
1053 }},
1054 {`package p6; func _() { { var x int; _ = x } }`, []string{
1055 "file:", "func:", "block:x",
1056 }},
1057 {`package p7; func _() { if true {} }`, []string{
1058 "file:", "func:", "if:", "block:",
1059 }},
1060 {`package p8; func _() { if x := 0; x < 0 { y := x; _ = y } }`, []string{
1061 "file:", "func:", "if:x", "block:y",
1062 }},
1063 {`package p9; func _() { switch x := 0; x {} }`, []string{
1064 "file:", "func:", "switch:x",
1065 }},
1066 {`package p10; func _() { switch x := 0; x { case 1: y := x; _ = y; default: }}`, []string{
1067 "file:", "func:", "switch:x", "case:y", "case:",
1068 }},
1069 {`package p11; func _(t interface{}) { switch t.(type) {} }`, []string{
1070 "file:", "func:t", "switch:",
1071 }},
1072 {`package p12; func _(t interface{}) { switch t := t; t.(type) {} }`, []string{
1073 "file:", "func:t", "switch:t",
1074 }},
1075 {`package p13; func _(t interface{}) { switch x := t.(type) { case int: _ = x } }`, []string{
1076 "file:", "func:t", "switch:", "case:x",
1077 }},
1078 {`package p14; func _() { select{} }`, []string{
1079 "file:", "func:",
1080 }},
1081 {`package p15; func _(c chan int) { select{ case <-c: } }`, []string{
1082 "file:", "func:c", "comm:",
1083 }},
1084 {`package p16; func _(c chan int) { select{ case i := <-c: x := i; _ = x} }`, []string{
1085 "file:", "func:c", "comm:i x",
1086 }},
1087 {`package p17; func _() { for{} }`, []string{
1088 "file:", "func:", "for:", "block:",
1089 }},
1090 {`package p18; func _(n int) { for i := 0; i < n; i++ { _ = i } }`, []string{
1091 "file:", "func:n", "for:i", "block:",
1092 }},
1093 {`package p19; func _(a []int) { for i := range a { _ = i} }`, []string{
1094 "file:", "func:a", "for:i", "block:",
1095 }},
1096 {`package p20; var s int; func _(a []int) { for i, x := range a { s += x; _ = i } }`, []string{
1097 "file:", "func:a", "for:i x", "block:",
1098 }},
1099 }
1100
1101 for _, test := range tests {
1102 info := Info{Scopes: make(map[syntax.Node]*Scope)}
1103 name := mustTypecheck(t, "ScopesInfo", test.src, &info)
1104
1105
1106 if len(info.Scopes) != len(test.scopes) {
1107 t.Errorf("package %s: got %d scopes; want %d", name, len(info.Scopes), len(test.scopes))
1108 }
1109
1110
1111 for node, scope := range info.Scopes {
1112 var kind string
1113 switch node.(type) {
1114 case *syntax.File:
1115 kind = "file"
1116 case *syntax.FuncType:
1117 kind = "func"
1118 case *syntax.BlockStmt:
1119 kind = "block"
1120 case *syntax.IfStmt:
1121 kind = "if"
1122 case *syntax.SwitchStmt:
1123 kind = "switch"
1124 case *syntax.SelectStmt:
1125 kind = "select"
1126 case *syntax.CaseClause:
1127 kind = "case"
1128 case *syntax.CommClause:
1129 kind = "comm"
1130 case *syntax.ForStmt:
1131 kind = "for"
1132 default:
1133 kind = fmt.Sprintf("%T", node)
1134 }
1135
1136
1137 desc := kind + ":" + strings.Join(scope.Names(), " ")
1138 found := false
1139 for _, d := range test.scopes {
1140 if desc == d {
1141 found = true
1142 break
1143 }
1144 }
1145 if !found {
1146 t.Errorf("package %s: no matching scope found for %s", name, desc)
1147 }
1148 }
1149 }
1150 }
1151
1152 func TestInitOrderInfo(t *testing.T) {
1153 var tests = []struct {
1154 src string
1155 inits []string
1156 }{
1157 {`package p0; var (x = 1; y = x)`, []string{
1158 "x = 1", "y = x",
1159 }},
1160 {`package p1; var (a = 1; b = 2; c = 3)`, []string{
1161 "a = 1", "b = 2", "c = 3",
1162 }},
1163 {`package p2; var (a, b, c = 1, 2, 3)`, []string{
1164 "a = 1", "b = 2", "c = 3",
1165 }},
1166 {`package p3; var _ = f(); func f() int { return 1 }`, []string{
1167 "_ = f()",
1168 }},
1169 {`package p4; var (a = 0; x = y; y = z; z = 0)`, []string{
1170 "a = 0", "z = 0", "y = z", "x = y",
1171 }},
1172 {`package p5; var (a, _ = m[0]; m map[int]string)`, []string{
1173 "a, _ = m[0]",
1174 }},
1175 {`package p6; var a, b = f(); func f() (_, _ int) { return z, z }; var z = 0`, []string{
1176 "z = 0", "a, b = f()",
1177 }},
1178 {`package p7; var (a = func() int { return b }(); b = 1)`, []string{
1179 "b = 1", "a = func() int {…}()",
1180 }},
1181 {`package p8; var (a, b = func() (_, _ int) { return c, c }(); c = 1)`, []string{
1182 "c = 1", "a, b = func() (_, _ int) {…}()",
1183 }},
1184 {`package p9; type T struct{}; func (T) m() int { _ = y; return 0 }; var x, y = T.m, 1`, []string{
1185 "y = 1", "x = T.m",
1186 }},
1187 {`package p10; var (d = c + b; a = 0; b = 0; c = 0)`, []string{
1188 "a = 0", "b = 0", "c = 0", "d = c + b",
1189 }},
1190 {`package p11; var (a = e + c; b = d + c; c = 0; d = 0; e = 0)`, []string{
1191 "c = 0", "d = 0", "b = d + c", "e = 0", "a = e + c",
1192 }},
1193
1194
1195 {`package p12; var (a = x; b = 0; x, y = m[0]; m map[int]int)`, []string{
1196 "b = 0", "x, y = m[0]", "a = x",
1197 }},
1198
1199 {`package p12
1200
1201 var (
1202 a = c + b
1203 b = f()
1204 c = f()
1205 d = 3
1206 )
1207
1208 func f() int {
1209 d++
1210 return d
1211 }`, []string{
1212 "d = 3", "b = f()", "c = f()", "a = c + b",
1213 }},
1214
1215 {`package main
1216
1217 var counter int
1218 func next() int { counter++; return counter }
1219
1220 var _ = makeOrder()
1221 func makeOrder() []int { return []int{f, b, d, e, c, a} }
1222
1223 var a = next()
1224 var b, c = next(), next()
1225 var d, e, f = next(), next(), next()
1226 `, []string{
1227 "a = next()", "b = next()", "c = next()", "d = next()", "e = next()", "f = next()", "_ = makeOrder()",
1228 }},
1229
1230 {`package p13
1231
1232 var (
1233 v = t.m()
1234 t = makeT(0)
1235 )
1236
1237 type T struct{}
1238
1239 func (T) m() int { return 0 }
1240
1241 func makeT(n int) T {
1242 if n > 0 {
1243 return makeT(n-1)
1244 }
1245 return T{}
1246 }`, []string{
1247 "t = makeT(0)", "v = t.m()",
1248 }},
1249
1250 {`package p14
1251
1252 var (
1253 t = makeT(0)
1254 v = t.m()
1255 )
1256
1257 type T struct{}
1258
1259 func (T) m() int { return 0 }
1260
1261 func makeT(n int) T {
1262 if n > 0 {
1263 return makeT(n-1)
1264 }
1265 return T{}
1266 }`, []string{
1267 "t = makeT(0)", "v = t.m()",
1268 }},
1269
1270 {`package p15
1271
1272 var y1 = f1()
1273
1274 func f1() int { return g1() }
1275 func g1() int { f1(); return x1 }
1276
1277 var x1 = 0
1278
1279 var y2 = f2()
1280
1281 func f2() int { return g2() }
1282 func g2() int { return x2 }
1283
1284 var x2 = 0`, []string{
1285 "x1 = 0", "y1 = f1()", "x2 = 0", "y2 = f2()",
1286 }},
1287 }
1288
1289 for _, test := range tests {
1290 info := Info{}
1291 name := mustTypecheck(t, "InitOrderInfo", test.src, &info)
1292
1293
1294 if len(info.InitOrder) != len(test.inits) {
1295 t.Errorf("package %s: got %d initializers; want %d", name, len(info.InitOrder), len(test.inits))
1296 continue
1297 }
1298
1299
1300 for i, want := range test.inits {
1301 got := info.InitOrder[i].String()
1302 if got != want {
1303 t.Errorf("package %s, init %d: got %s; want %s", name, i, got, want)
1304 continue
1305 }
1306 }
1307 }
1308 }
1309
1310 func TestMultiFileInitOrder(t *testing.T) {
1311 mustParse := func(src string) *syntax.File {
1312 f, err := parseSrc("main", src)
1313 if err != nil {
1314 t.Fatal(err)
1315 }
1316 return f
1317 }
1318
1319 fileA := mustParse(`package main; var a = 1`)
1320 fileB := mustParse(`package main; var b = 2`)
1321
1322
1323
1324
1325 for _, test := range []struct {
1326 files []*syntax.File
1327 want string
1328 }{
1329 {[]*syntax.File{fileA, fileB}, "[a = 1 b = 2]"},
1330 {[]*syntax.File{fileB, fileA}, "[b = 2 a = 1]"},
1331 } {
1332 var info Info
1333 if _, err := new(Config).Check("main", test.files, &info); err != nil {
1334 t.Fatal(err)
1335 }
1336 if got := fmt.Sprint(info.InitOrder); got != test.want {
1337 t.Fatalf("got %s; want %s", got, test.want)
1338 }
1339 }
1340 }
1341
1342 func TestFiles(t *testing.T) {
1343 var sources = []string{
1344 "package p; type T struct{}; func (T) m1() {}",
1345 "package p; func (T) m2() {}; var x interface{ m1(); m2() } = T{}",
1346 "package p; func (T) m3() {}; var y interface{ m1(); m2(); m3() } = T{}",
1347 "package p",
1348 }
1349
1350 var conf Config
1351 pkg := NewPackage("p", "p")
1352 var info Info
1353 check := NewChecker(&conf, pkg, &info)
1354
1355 for i, src := range sources {
1356 filename := fmt.Sprintf("sources%d", i)
1357 f, err := parseSrc(filename, src)
1358 if err != nil {
1359 t.Fatal(err)
1360 }
1361 if err := check.Files([]*syntax.File{f}); err != nil {
1362 t.Error(err)
1363 }
1364 }
1365
1366
1367 var vars []string
1368 for _, init := range info.InitOrder {
1369 for _, v := range init.Lhs {
1370 vars = append(vars, v.Name())
1371 }
1372 }
1373 if got, want := fmt.Sprint(vars), "[x y]"; got != want {
1374 t.Errorf("InitOrder == %s, want %s", got, want)
1375 }
1376 }
1377
1378 type testImporter map[string]*Package
1379
1380 func (m testImporter) Import(path string) (*Package, error) {
1381 if pkg := m[path]; pkg != nil {
1382 return pkg, nil
1383 }
1384 return nil, fmt.Errorf("package %q not found", path)
1385 }
1386
1387 func TestSelection(t *testing.T) {
1388 selections := make(map[*syntax.SelectorExpr]*Selection)
1389
1390 imports := make(testImporter)
1391 conf := Config{Importer: imports}
1392 makePkg := func(path, src string) {
1393 f, err := parseSrc(path+".go", src)
1394 if err != nil {
1395 t.Fatal(err)
1396 }
1397 pkg, err := conf.Check(path, []*syntax.File{f}, &Info{Selections: selections})
1398 if err != nil {
1399 t.Fatal(err)
1400 }
1401 imports[path] = pkg
1402 }
1403
1404 const libSrc = `
1405 package lib
1406 type T float64
1407 const C T = 3
1408 var V T
1409 func F() {}
1410 func (T) M() {}
1411 `
1412 const mainSrc = `
1413 package main
1414 import "lib"
1415
1416 type A struct {
1417 *B
1418 C
1419 }
1420
1421 type B struct {
1422 b int
1423 }
1424
1425 func (B) f(int)
1426
1427 type C struct {
1428 c int
1429 }
1430
1431 func (C) g()
1432 func (*C) h()
1433
1434 func main() {
1435 // qualified identifiers
1436 var _ lib.T
1437 _ = lib.C
1438 _ = lib.F
1439 _ = lib.V
1440 _ = lib.T.M
1441
1442 // fields
1443 _ = A{}.B
1444 _ = new(A).B
1445
1446 _ = A{}.C
1447 _ = new(A).C
1448
1449 _ = A{}.b
1450 _ = new(A).b
1451
1452 _ = A{}.c
1453 _ = new(A).c
1454
1455 // methods
1456 _ = A{}.f
1457 _ = new(A).f
1458 _ = A{}.g
1459 _ = new(A).g
1460 _ = new(A).h
1461
1462 _ = B{}.f
1463 _ = new(B).f
1464
1465 _ = C{}.g
1466 _ = new(C).g
1467 _ = new(C).h
1468
1469 // method expressions
1470 _ = A.f
1471 _ = (*A).f
1472 _ = B.f
1473 _ = (*B).f
1474 }`
1475
1476 wantOut := map[string][2]string{
1477 "lib.T.M": {"method expr (lib.T) M(lib.T)", ".[0]"},
1478
1479 "A{}.B": {"field (main.A) B *main.B", ".[0]"},
1480 "new(A).B": {"field (*main.A) B *main.B", "->[0]"},
1481 "A{}.C": {"field (main.A) C main.C", ".[1]"},
1482 "new(A).C": {"field (*main.A) C main.C", "->[1]"},
1483 "A{}.b": {"field (main.A) b int", "->[0 0]"},
1484 "new(A).b": {"field (*main.A) b int", "->[0 0]"},
1485 "A{}.c": {"field (main.A) c int", ".[1 0]"},
1486 "new(A).c": {"field (*main.A) c int", "->[1 0]"},
1487
1488 "A{}.f": {"method (main.A) f(int)", "->[0 0]"},
1489 "new(A).f": {"method (*main.A) f(int)", "->[0 0]"},
1490 "A{}.g": {"method (main.A) g()", ".[1 0]"},
1491 "new(A).g": {"method (*main.A) g()", "->[1 0]"},
1492 "new(A).h": {"method (*main.A) h()", "->[1 1]"},
1493 "B{}.f": {"method (main.B) f(int)", ".[0]"},
1494 "new(B).f": {"method (*main.B) f(int)", "->[0]"},
1495 "C{}.g": {"method (main.C) g()", ".[0]"},
1496 "new(C).g": {"method (*main.C) g()", "->[0]"},
1497 "new(C).h": {"method (*main.C) h()", "->[1]"},
1498
1499 "A.f": {"method expr (main.A) f(main.A, int)", "->[0 0]"},
1500 "(*A).f": {"method expr (*main.A) f(*main.A, int)", "->[0 0]"},
1501 "B.f": {"method expr (main.B) f(main.B, int)", ".[0]"},
1502 "(*B).f": {"method expr (*main.B) f(*main.B, int)", "->[0]"},
1503 }
1504
1505 makePkg("lib", libSrc)
1506 makePkg("main", mainSrc)
1507
1508 for e, sel := range selections {
1509 _ = sel.String()
1510
1511 start := indexFor(mainSrc, syntax.StartPos(e))
1512 end := indexFor(mainSrc, syntax.EndPos(e))
1513 segment := mainSrc[start:end]
1514
1515 direct := "."
1516 if sel.Indirect() {
1517 direct = "->"
1518 }
1519 got := [2]string{
1520 sel.String(),
1521 fmt.Sprintf("%s%v", direct, sel.Index()),
1522 }
1523 want := wantOut[segment]
1524 if want != got {
1525 t.Errorf("%s: got %q; want %q", segment, got, want)
1526 }
1527 delete(wantOut, segment)
1528
1529
1530
1531
1532 sig, _ := sel.Type().(*Signature)
1533 if sel.Kind() == MethodVal {
1534 got := sig.Recv().Type()
1535 want := sel.Recv()
1536 if !Identical(got, want) {
1537 t.Errorf("%s: Recv() = %s, want %s", segment, got, want)
1538 }
1539 } else if sig != nil && sig.Recv() != nil {
1540 t.Errorf("%s: signature has receiver %s", sig, sig.Recv().Type())
1541 }
1542 }
1543
1544 for segment := range wantOut {
1545 t.Errorf("no syntax.Selection found with syntax %q", segment)
1546 }
1547 }
1548
1549
1550 func indexFor(s string, pos syntax.Pos) int {
1551 i, line := 0, 1
1552 target := int(pos.Line())
1553 for line < target && i < len(s) {
1554 if s[i] == '\n' {
1555 line++
1556 }
1557 i++
1558 }
1559 return i + int(pos.Col()-1)
1560 }
1561
1562 func TestIssue8518(t *testing.T) {
1563 imports := make(testImporter)
1564 conf := Config{
1565 Error: func(err error) { t.Log(err) },
1566 Importer: imports,
1567 }
1568 makePkg := func(path, src string) {
1569 f, err := parseSrc(path, src)
1570 if err != nil {
1571 t.Fatal(err)
1572 }
1573 pkg, _ := conf.Check(path, []*syntax.File{f}, nil)
1574 imports[path] = pkg
1575 }
1576
1577 const libSrc = `
1578 package a
1579 import "missing"
1580 const C1 = foo
1581 const C2 = missing.C
1582 `
1583
1584 const mainSrc = `
1585 package main
1586 import "a"
1587 var _ = a.C1
1588 var _ = a.C2
1589 `
1590
1591 makePkg("a", libSrc)
1592 makePkg("main", mainSrc)
1593 }
1594
1595 func TestLookupFieldOrMethodOnNil(t *testing.T) {
1596
1597 defer func() {
1598 const want = "LookupFieldOrMethod on nil type"
1599 p := recover()
1600 if s, ok := p.(string); !ok || s != want {
1601 t.Fatalf("got %v, want %s", p, want)
1602 }
1603 }()
1604 LookupFieldOrMethod(nil, false, nil, "")
1605 }
1606
1607 func TestLookupFieldOrMethod(t *testing.T) {
1608
1609
1610
1611 var tests = []struct {
1612 src string
1613 found bool
1614 index []int
1615 indirect bool
1616 }{
1617
1618 {"var x T; type T struct{}", false, nil, false},
1619 {"var x T; type T struct{ f int }", true, []int{0}, false},
1620 {"var x T; type T struct{ a, b, f, c int }", true, []int{2}, false},
1621
1622
1623 {"var x T[int]; type T[P any] struct{}", false, nil, false},
1624 {"var x T[int]; type T[P any] struct{ f P }", true, []int{0}, false},
1625 {"var x T[int]; type T[P any] struct{ a, b, f, c P }", true, []int{2}, false},
1626
1627
1628 {"var a T; type T struct{}; func (T) f() {}", true, []int{0}, false},
1629 {"var a *T; type T struct{}; func (T) f() {}", true, []int{0}, true},
1630 {"var a T; type T struct{}; func (*T) f() {}", true, []int{0}, false},
1631 {"var a *T; type T struct{}; func (*T) f() {}", true, []int{0}, true},
1632
1633
1634 {"var a T[int]; type T[P any] struct{}; func (T[P]) f() {}", true, []int{0}, false},
1635 {"var a *T[int]; type T[P any] struct{}; func (T[P]) f() {}", true, []int{0}, true},
1636 {"var a T[int]; type T[P any] struct{}; func (*T[P]) f() {}", true, []int{0}, false},
1637 {"var a *T[int]; type T[P any] struct{}; func (*T[P]) f() {}", true, []int{0}, true},
1638
1639
1640 {"type ( E1 struct{ f int }; E2 struct{ f int }; x struct{ E1; *E2 })", false, []int{1, 0}, false},
1641 {"type ( E1 struct{ f int }; E2 struct{}; x struct{ E1; *E2 }); func (E2) f() {}", false, []int{1, 0}, false},
1642
1643
1644 {"type ( E1[P any] struct{ f P }; E2[P any] struct{ f P }; x struct{ E1[int]; *E2[int] })", false, []int{1, 0}, false},
1645 {"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},
1646
1647
1648
1649 {"var x T; type T struct{}; func (*T) f() {}", false, nil, true},
1650
1651
1652 {"var x T[int]; type T[P any] struct{}; func (*T[P]) f() {}", false, nil, true},
1653
1654
1655 {"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},
1656 {"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},
1657 }
1658
1659 for _, test := range tests {
1660 pkg, err := pkgFor("test", "package p;"+test.src, nil)
1661 if err != nil {
1662 t.Errorf("%s: incorrect test case: %s", test.src, err)
1663 continue
1664 }
1665
1666 obj := pkg.Scope().Lookup("a")
1667 if obj == nil {
1668 if obj = pkg.Scope().Lookup("x"); obj == nil {
1669 t.Errorf("%s: incorrect test case - no object a or x", test.src)
1670 continue
1671 }
1672 }
1673
1674 f, index, indirect := LookupFieldOrMethod(obj.Type(), obj.Name() == "a", pkg, "f")
1675 if (f != nil) != test.found {
1676 if f == nil {
1677 t.Errorf("%s: got no object; want one", test.src)
1678 } else {
1679 t.Errorf("%s: got object = %v; want none", test.src, f)
1680 }
1681 }
1682 if !sameSlice(index, test.index) {
1683 t.Errorf("%s: got index = %v; want %v", test.src, index, test.index)
1684 }
1685 if indirect != test.indirect {
1686 t.Errorf("%s: got indirect = %v; want %v", test.src, indirect, test.indirect)
1687 }
1688 }
1689 }
1690
1691
1692 func TestLookupFieldOrMethod_RecursiveGeneric(t *testing.T) {
1693 const src = `
1694 package pkg
1695
1696 type Tree[T any] struct {
1697 *Node[T]
1698 }
1699
1700 func (*Tree[R]) N(r R) R { return r }
1701
1702 type Node[T any] struct {
1703 *Tree[T]
1704 }
1705
1706 type Instance = *Tree[int]
1707 `
1708
1709 f, err := parseSrc("foo.go", src)
1710 if err != nil {
1711 panic(err)
1712 }
1713 pkg := NewPackage("pkg", f.PkgName.Value)
1714 if err := NewChecker(nil, pkg, nil).Files([]*syntax.File{f}); err != nil {
1715 panic(err)
1716 }
1717
1718 T := pkg.Scope().Lookup("Instance").Type()
1719 _, _, _ = LookupFieldOrMethod(T, false, pkg, "M")
1720 }
1721
1722 func sameSlice(a, b []int) bool {
1723 if len(a) != len(b) {
1724 return false
1725 }
1726 for i, x := range a {
1727 if x != b[i] {
1728 return false
1729 }
1730 }
1731 return true
1732 }
1733
1734
1735
1736 func TestScopeLookupParent(t *testing.T) {
1737 imports := make(testImporter)
1738 conf := Config{Importer: imports}
1739 var info Info
1740 makePkg := func(path, src string) {
1741 f, err := parseSrc(path, src)
1742 if err != nil {
1743 t.Fatal(err)
1744 }
1745 imports[path], err = conf.Check(path, []*syntax.File{f}, &info)
1746 if err != nil {
1747 t.Fatal(err)
1748 }
1749 }
1750
1751 makePkg("lib", "package lib; var X int")
1752
1753
1754
1755 mainSrc := `
1756 /*lib=pkgname:5*/ /*X=var:1*/ /*Pi=const:8*/ /*T=typename:9*/ /*Y=var:10*/ /*F=func:12*/
1757 package main
1758
1759 import "lib"
1760 import . "lib"
1761
1762 const Pi = 3.1415
1763 type T struct{}
1764 var Y, _ = lib.X, X
1765
1766 func F(){
1767 const pi, e = 3.1415, /*pi=undef*/ 2.71828 /*pi=const:13*/ /*e=const:13*/
1768 type /*t=undef*/ t /*t=typename:14*/ *t
1769 print(Y) /*Y=var:10*/
1770 x, Y := Y, /*x=undef*/ /*Y=var:10*/ Pi /*x=var:16*/ /*Y=var:16*/ ; _ = x; _ = Y
1771 var F = /*F=func:12*/ F /*F=var:17*/ ; _ = F
1772
1773 var a []int
1774 for i, x := range a /*i=undef*/ /*x=var:16*/ { _ = i; _ = x }
1775
1776 var i interface{}
1777 switch y := i.(type) { /*y=undef*/
1778 case /*y=undef*/ int /*y=var:23*/ :
1779 case float32, /*y=undef*/ float64 /*y=var:23*/ :
1780 default /*y=var:23*/:
1781 println(y)
1782 }
1783 /*y=undef*/
1784
1785 switch int := i.(type) {
1786 case /*int=typename:0*/ int /*int=var:31*/ :
1787 println(int)
1788 default /*int=var:31*/ :
1789 }
1790 }
1791 /*main=undef*/
1792 `
1793
1794 info.Uses = make(map[*syntax.Name]Object)
1795 makePkg("main", mainSrc)
1796 mainScope := imports["main"].Scope()
1797
1798 rx := regexp.MustCompile(`^/\*(\w*)=([\w:]*)\*/$`)
1799
1800 base := syntax.NewFileBase("main")
1801 syntax.CommentsDo(strings.NewReader(mainSrc), func(line, col uint, text string) {
1802 pos := syntax.MakePos(base, line, col)
1803
1804
1805 if text[0] != '/' {
1806 t.Errorf("%s: %s", pos, text)
1807 return
1808 }
1809
1810
1811 m := rx.FindStringSubmatch(text)
1812 if m == nil {
1813 t.Errorf("%s: bad comment: %s", pos, text)
1814 return
1815 }
1816 name, want := m[1], m[2]
1817
1818
1819 inner := mainScope.Innermost(pos)
1820 if inner == nil {
1821 t.Errorf("%s: at %s: can't find innermost scope", pos, text)
1822 return
1823 }
1824 got := "undef"
1825 if _, obj := inner.LookupParent(name, pos); obj != nil {
1826 kind := strings.ToLower(strings.TrimPrefix(reflect.TypeOf(obj).String(), "*types2."))
1827 got = fmt.Sprintf("%s:%d", kind, obj.Pos().Line())
1828 }
1829 if got != want {
1830 t.Errorf("%s: at %s: %s resolved to %s, want %s", pos, text, name, got, want)
1831 }
1832 })
1833
1834
1835
1836
1837
1838 for id, wantObj := range info.Uses {
1839 inner := mainScope.Innermost(id.Pos())
1840 if inner == nil {
1841 t.Errorf("%s: can't find innermost scope enclosing %q", id.Pos(), id.Value)
1842 continue
1843 }
1844
1845
1846
1847
1848
1849 if id.Value == "X" {
1850 continue
1851 }
1852
1853 _, gotObj := inner.LookupParent(id.Value, id.Pos())
1854 if gotObj != wantObj {
1855 t.Errorf("%s: got %v, want %v", id.Pos(), gotObj, wantObj)
1856 continue
1857 }
1858 }
1859 }
1860
1861 var nopos syntax.Pos
1862
1863
1864 func newDefined(underlying Type) *Named {
1865 tname := NewTypeName(nopos, nil, "T", nil)
1866 return NewNamed(tname, underlying, nil)
1867 }
1868
1869 func TestConvertibleTo(t *testing.T) {
1870 for _, test := range []struct {
1871 v, t Type
1872 want bool
1873 }{
1874 {Typ[Int], Typ[Int], true},
1875 {Typ[Int], Typ[Float32], true},
1876 {Typ[Int], Typ[String], true},
1877 {newDefined(Typ[Int]), Typ[Int], true},
1878 {newDefined(new(Struct)), new(Struct), true},
1879 {newDefined(Typ[Int]), new(Struct), false},
1880 {Typ[UntypedInt], Typ[Int], true},
1881 {NewSlice(Typ[Int]), NewPointer(NewArray(Typ[Int], 10)), true},
1882 {NewSlice(Typ[Int]), NewArray(Typ[Int], 10), false},
1883 {NewSlice(Typ[Int]), NewPointer(NewArray(Typ[Uint], 10)), false},
1884
1885 {Typ[UntypedString], Typ[String], true},
1886 } {
1887 if got := ConvertibleTo(test.v, test.t); got != test.want {
1888 t.Errorf("ConvertibleTo(%v, %v) = %t, want %t", test.v, test.t, got, test.want)
1889 }
1890 }
1891 }
1892
1893 func TestAssignableTo(t *testing.T) {
1894 for _, test := range []struct {
1895 v, t Type
1896 want bool
1897 }{
1898 {Typ[Int], Typ[Int], true},
1899 {Typ[Int], Typ[Float32], false},
1900 {newDefined(Typ[Int]), Typ[Int], false},
1901 {newDefined(new(Struct)), new(Struct), true},
1902 {Typ[UntypedBool], Typ[Bool], true},
1903 {Typ[UntypedString], Typ[Bool], false},
1904
1905
1906
1907 {Typ[UntypedString], Typ[String], true},
1908 {Typ[UntypedInt], Typ[Int], true},
1909 } {
1910 if got := AssignableTo(test.v, test.t); got != test.want {
1911 t.Errorf("AssignableTo(%v, %v) = %t, want %t", test.v, test.t, got, test.want)
1912 }
1913 }
1914 }
1915
1916 func TestIdentical(t *testing.T) {
1917
1918 tests := []struct {
1919 src string
1920 want bool
1921 }{
1922
1923 {"var X int; var Y int", true},
1924 {"var X int; var Y string", false},
1925
1926
1927
1928
1929 {"type X int; type Y int", false},
1930
1931
1932 {"type X = int; type Y = int", true},
1933
1934
1935 {`func X(int) string { return "" }; func Y(int) string { return "" }`, true},
1936 {`func X() string { return "" }; func Y(int) string { return "" }`, false},
1937 {`func X(int) string { return "" }; func Y(int) {}`, false},
1938
1939
1940
1941 {`func X[P ~int](){}; func Y[Q ~int]() {}`, true},
1942 {`func X[P1 any, P2 ~*P1](){}; func Y[Q1 any, Q2 ~*Q1]() {}`, true},
1943 {`func X[P1 any, P2 ~[]P1](){}; func Y[Q1 any, Q2 ~*Q1]() {}`, false},
1944 {`func X[P ~int](P){}; func Y[Q ~int](Q) {}`, true},
1945 {`func X[P ~string](P){}; func Y[Q ~int](Q) {}`, false},
1946 {`func X[P ~int]([]P){}; func Y[Q ~int]([]Q) {}`, true},
1947 }
1948
1949 for _, test := range tests {
1950 pkg, err := pkgFor("test", "package p;"+test.src, nil)
1951 if err != nil {
1952 t.Errorf("%s: incorrect test case: %s", test.src, err)
1953 continue
1954 }
1955 X := pkg.Scope().Lookup("X")
1956 Y := pkg.Scope().Lookup("Y")
1957 if X == nil || Y == nil {
1958 t.Fatal("test must declare both X and Y")
1959 }
1960 if got := Identical(X.Type(), Y.Type()); got != test.want {
1961 t.Errorf("Identical(%s, %s) = %t, want %t", X.Type(), Y.Type(), got, test.want)
1962 }
1963 }
1964 }
1965
1966 func TestIdentical_issue15173(t *testing.T) {
1967
1968 for _, test := range []struct {
1969 x, y Type
1970 want bool
1971 }{
1972 {Typ[Int], Typ[Int], true},
1973 {Typ[Int], nil, false},
1974 {nil, Typ[Int], false},
1975 {nil, nil, true},
1976 } {
1977 if got := Identical(test.x, test.y); got != test.want {
1978 t.Errorf("Identical(%v, %v) = %t", test.x, test.y, got)
1979 }
1980 }
1981 }
1982
1983 func TestIdenticalUnions(t *testing.T) {
1984 tname := NewTypeName(nopos, nil, "myInt", nil)
1985 myInt := NewNamed(tname, Typ[Int], nil)
1986 tmap := map[string]*Term{
1987 "int": NewTerm(false, Typ[Int]),
1988 "~int": NewTerm(true, Typ[Int]),
1989 "string": NewTerm(false, Typ[String]),
1990 "~string": NewTerm(true, Typ[String]),
1991 "myInt": NewTerm(false, myInt),
1992 }
1993 makeUnion := func(s string) *Union {
1994 parts := strings.Split(s, "|")
1995 var terms []*Term
1996 for _, p := range parts {
1997 term := tmap[p]
1998 if term == nil {
1999 t.Fatalf("missing term %q", p)
2000 }
2001 terms = append(terms, term)
2002 }
2003 return NewUnion(terms)
2004 }
2005 for _, test := range []struct {
2006 x, y string
2007 want bool
2008 }{
2009
2010
2011 {"int|~int", "~int", true},
2012 {"myInt|~int", "~int", true},
2013 {"int|string", "string|int", true},
2014 {"int|int|string", "string|int", true},
2015 {"myInt|string", "int|string", false},
2016 } {
2017 x := makeUnion(test.x)
2018 y := makeUnion(test.y)
2019 if got := Identical(x, y); got != test.want {
2020 t.Errorf("Identical(%v, %v) = %t", test.x, test.y, got)
2021 }
2022 }
2023 }
2024
2025 func TestIssue15305(t *testing.T) {
2026 const src = "package p; func f() int16; var _ = f(undef)"
2027 f, err := parseSrc("issue15305.go", src)
2028 if err != nil {
2029 t.Fatal(err)
2030 }
2031 conf := Config{
2032 Error: func(err error) {},
2033 }
2034 info := &Info{
2035 Types: make(map[syntax.Expr]TypeAndValue),
2036 }
2037 conf.Check("p", []*syntax.File{f}, info)
2038 for e, tv := range info.Types {
2039 if _, ok := e.(*syntax.CallExpr); ok {
2040 if tv.Type != Typ[Int16] {
2041 t.Errorf("CallExpr has type %v, want int16", tv.Type)
2042 }
2043 return
2044 }
2045 }
2046 t.Errorf("CallExpr has no type")
2047 }
2048
2049
2050
2051
2052 func TestCompositeLitTypes(t *testing.T) {
2053 for _, test := range []struct {
2054 lit, typ string
2055 }{
2056 {`[16]byte{}`, `[16]byte`},
2057 {`[...]byte{}`, `[0]byte`},
2058 {`[...]int{1, 2, 3}`, `[3]int`},
2059 {`[...]int{90: 0, 98: 1, 2}`, `[100]int`},
2060 {`[]int{}`, `[]int`},
2061 {`map[string]bool{"foo": true}`, `map[string]bool`},
2062 {`struct{}{}`, `struct{}`},
2063 {`struct{x, y int; z complex128}{}`, `struct{x int; y int; z complex128}`},
2064 } {
2065 f, err := parseSrc(test.lit, "package p; var _ = "+test.lit)
2066 if err != nil {
2067 t.Fatalf("%s: %v", test.lit, err)
2068 }
2069
2070 info := &Info{
2071 Types: make(map[syntax.Expr]TypeAndValue),
2072 }
2073 if _, err = new(Config).Check("p", []*syntax.File{f}, info); err != nil {
2074 t.Fatalf("%s: %v", test.lit, err)
2075 }
2076
2077 cmptype := func(x syntax.Expr, want string) {
2078 tv, ok := info.Types[x]
2079 if !ok {
2080 t.Errorf("%s: no Types entry found", test.lit)
2081 return
2082 }
2083 if tv.Type == nil {
2084 t.Errorf("%s: type is nil", test.lit)
2085 return
2086 }
2087 if got := tv.Type.String(); got != want {
2088 t.Errorf("%s: got %v, want %s", test.lit, got, want)
2089 }
2090 }
2091
2092
2093 rhs := f.DeclList[0].(*syntax.VarDecl).Values
2094 cmptype(rhs, test.typ)
2095
2096
2097 cmptype(rhs.(*syntax.CompositeLit).Type, test.typ)
2098 }
2099 }
2100
2101
2102
2103 func TestObjectParents(t *testing.T) {
2104 const src = `
2105 package p
2106
2107 const C = 0
2108
2109 type T1 struct {
2110 a, b int
2111 T2
2112 }
2113
2114 type T2 interface {
2115 im1()
2116 im2()
2117 }
2118
2119 func (T1) m1() {}
2120 func (*T1) m2() {}
2121
2122 func f(x int) { y := x; print(y) }
2123 `
2124
2125 f, err := parseSrc("src", src)
2126 if err != nil {
2127 t.Fatal(err)
2128 }
2129
2130 info := &Info{
2131 Defs: make(map[*syntax.Name]Object),
2132 }
2133 if _, err = new(Config).Check("p", []*syntax.File{f}, info); err != nil {
2134 t.Fatal(err)
2135 }
2136
2137 for ident, obj := range info.Defs {
2138 if obj == nil {
2139
2140
2141 if ident.Value != "p" {
2142 t.Errorf("%v has nil object", ident)
2143 }
2144 continue
2145 }
2146
2147
2148
2149 wantParent := true
2150 switch obj := obj.(type) {
2151 case *Var:
2152 if obj.IsField() {
2153 wantParent = false
2154 }
2155 case *Func:
2156 if obj.Type().(*Signature).Recv() != nil {
2157 wantParent = false
2158 }
2159 }
2160
2161 gotParent := obj.Parent() != nil
2162 switch {
2163 case gotParent && !wantParent:
2164 t.Errorf("%v: want no parent, got %s", ident, obj.Parent())
2165 case !gotParent && wantParent:
2166 t.Errorf("%v: no parent found", ident)
2167 }
2168 }
2169 }
2170
2171
2172
2173 func TestFailedImport(t *testing.T) {
2174 testenv.MustHaveGoBuild(t)
2175
2176 const src = `
2177 package p
2178
2179 import foo "go/types/thisdirectorymustnotexistotherwisethistestmayfail/foo" // should only see an error here
2180
2181 const c = foo.C
2182 type T = foo.T
2183 var v T = c
2184 func f(x T) T { return foo.F(x) }
2185 `
2186 f, err := parseSrc("src", src)
2187 if err != nil {
2188 t.Fatal(err)
2189 }
2190 files := []*syntax.File{f}
2191
2192
2193 for _, compiler := range []string{"gc", "gccgo", "source"} {
2194 errcount := 0
2195 conf := Config{
2196 Error: func(err error) {
2197
2198 if errcount > 0 || !strings.Contains(err.Error(), "could not import") {
2199 t.Errorf("for %s importer, got unexpected error: %v", compiler, err)
2200 }
2201 errcount++
2202 },
2203
2204 }
2205
2206 info := &Info{
2207 Uses: make(map[*syntax.Name]Object),
2208 }
2209 pkg, _ := conf.Check("p", files, info)
2210 if pkg == nil {
2211 t.Errorf("for %s importer, type-checking failed to return a package", compiler)
2212 continue
2213 }
2214
2215 imports := pkg.Imports()
2216 if len(imports) != 1 {
2217 t.Errorf("for %s importer, got %d imports, want 1", compiler, len(imports))
2218 continue
2219 }
2220 imp := imports[0]
2221 if imp.Name() != "foo" {
2222 t.Errorf(`for %s importer, got %q, want "foo"`, compiler, imp.Name())
2223 continue
2224 }
2225
2226
2227 for ident, obj := range info.Uses {
2228 if ident.Value == "foo" {
2229 if obj, ok := obj.(*PkgName); ok {
2230 if obj.Imported() != imp {
2231 t.Errorf("%s resolved to %v; want %v", ident.Value, obj.Imported(), imp)
2232 }
2233 } else {
2234 t.Errorf("%s resolved to %v; want package name", ident.Value, obj)
2235 }
2236 }
2237 }
2238 }
2239 }
2240
2241 func TestInstantiate(t *testing.T) {
2242
2243 const src = "package p; type T[P any] *T[P]"
2244 pkg, err := pkgFor(".", src, nil)
2245 if err != nil {
2246 t.Fatal(err)
2247 }
2248
2249
2250 T := pkg.Scope().Lookup("T").Type().(*Named)
2251 if n := T.TypeParams().Len(); n != 1 {
2252 t.Fatalf("expected 1 type parameter; found %d", n)
2253 }
2254
2255
2256
2257 res, err := Instantiate(nil, T, []Type{Typ[Int]}, false)
2258 if err != nil {
2259 t.Fatal(err)
2260 }
2261
2262
2263 if p := res.Underlying().(*Pointer).Elem(); p != res {
2264 t.Fatalf("unexpected result type: %s points to %s", res, p)
2265 }
2266 }
2267
2268 func TestInstantiateErrors(t *testing.T) {
2269 tests := []struct {
2270 src string
2271 targs []Type
2272 wantAt int
2273 }{
2274 {"type T[P interface{~string}] int", []Type{Typ[Int]}, 0},
2275 {"type T[P1 interface{int}, P2 interface{~string}] int", []Type{Typ[Int], Typ[Int]}, 1},
2276 {"type T[P1 any, P2 interface{~[]P1}] int", []Type{Typ[Int], NewSlice(Typ[String])}, 1},
2277 {"type T[P1 interface{~[]P2}, P2 any] int", []Type{NewSlice(Typ[String]), Typ[Int]}, 0},
2278 }
2279
2280 for _, test := range tests {
2281 src := "package p; " + test.src
2282 pkg, err := pkgFor(".", src, nil)
2283 if err != nil {
2284 t.Fatal(err)
2285 }
2286
2287 T := pkg.Scope().Lookup("T").Type().(*Named)
2288
2289 _, err = Instantiate(nil, T, test.targs, true)
2290 if err == nil {
2291 t.Fatalf("Instantiate(%v, %v) returned nil error, want non-nil", T, test.targs)
2292 }
2293
2294 var argErr *ArgumentError
2295 if !errors.As(err, &argErr) {
2296 t.Fatalf("Instantiate(%v, %v): error is not an *ArgumentError", T, test.targs)
2297 }
2298
2299 if argErr.Index != test.wantAt {
2300 t.Errorf("Instantate(%v, %v): error at index %d, want index %d", T, test.targs, argErr.Index, test.wantAt)
2301 }
2302 }
2303 }
2304
2305 func TestArgumentErrorUnwrapping(t *testing.T) {
2306 var err error = &ArgumentError{
2307 Index: 1,
2308 Err: Error{Msg: "test"},
2309 }
2310 var e Error
2311 if !errors.As(err, &e) {
2312 t.Fatalf("error %v does not wrap types.Error", err)
2313 }
2314 if e.Msg != "test" {
2315 t.Errorf("e.Msg = %q, want %q", e.Msg, "test")
2316 }
2317 }
2318
2319 func TestInstanceIdentity(t *testing.T) {
2320 imports := make(testImporter)
2321 conf := Config{Importer: imports}
2322 makePkg := func(src string) {
2323 f, err := parseSrc("", src)
2324 if err != nil {
2325 t.Fatal(err)
2326 }
2327 name := f.PkgName.Value
2328 pkg, err := conf.Check(name, []*syntax.File{f}, nil)
2329 if err != nil {
2330 t.Fatal(err)
2331 }
2332 imports[name] = pkg
2333 }
2334 makePkg(`package lib; type T[P any] struct{}`)
2335 makePkg(`package a; import "lib"; var A lib.T[int]`)
2336 makePkg(`package b; import "lib"; var B lib.T[int]`)
2337 a := imports["a"].Scope().Lookup("A")
2338 b := imports["b"].Scope().Lookup("B")
2339 if !Identical(a.Type(), b.Type()) {
2340 t.Errorf("mismatching types: a.A: %s, b.B: %s", a.Type(), b.Type())
2341 }
2342 }
2343
2344
2345 func TestInstantiatedObjects(t *testing.T) {
2346 const src = `
2347 package p
2348
2349 type T[P any] struct {
2350 field P
2351 }
2352
2353 func (recv *T[Q]) concreteMethod() {}
2354
2355 type FT[P any] func(ftp P) (ftrp P)
2356
2357 func F[P any](fp P) (frp P){ return }
2358
2359 type I[P any] interface {
2360 interfaceMethod(P)
2361 }
2362
2363 var (
2364 t T[int]
2365 ft FT[int]
2366 f = F[int]
2367 i I[int]
2368 )
2369 `
2370 info := &Info{
2371 Defs: make(map[*syntax.Name]Object),
2372 }
2373 f, err := parseSrc("p.go", src)
2374 if err != nil {
2375 t.Fatal(err)
2376 }
2377 conf := Config{}
2378 pkg, err := conf.Check(f.PkgName.Value, []*syntax.File{f}, info)
2379 if err != nil {
2380 t.Fatal(err)
2381 }
2382
2383 lookup := func(name string) Type { return pkg.Scope().Lookup(name).Type() }
2384 tests := []struct {
2385 ident string
2386 obj Object
2387 }{
2388 {"field", lookup("t").Underlying().(*Struct).Field(0)},
2389 {"concreteMethod", lookup("t").(*Named).Method(0)},
2390 {"recv", lookup("t").(*Named).Method(0).Type().(*Signature).Recv()},
2391 {"ftp", lookup("ft").Underlying().(*Signature).Params().At(0)},
2392 {"ftrp", lookup("ft").Underlying().(*Signature).Results().At(0)},
2393 {"fp", lookup("f").(*Signature).Params().At(0)},
2394 {"frp", lookup("f").(*Signature).Results().At(0)},
2395 {"interfaceMethod", lookup("i").Underlying().(*Interface).Method(0)},
2396 }
2397
2398
2399 idents := make(map[string][]*syntax.Name)
2400 syntax.Inspect(f, func(n syntax.Node) bool {
2401 if id, ok := n.(*syntax.Name); ok {
2402 idents[id.Value] = append(idents[id.Value], id)
2403 }
2404 return true
2405 })
2406
2407 for _, test := range tests {
2408 test := test
2409 t.Run(test.ident, func(t *testing.T) {
2410 if got := len(idents[test.ident]); got != 1 {
2411 t.Fatalf("found %d identifiers named %s, want 1", got, test.ident)
2412 }
2413 ident := idents[test.ident][0]
2414 def := info.Defs[ident]
2415 if def == test.obj {
2416 t.Fatalf("info.Defs[%s] contains the test object", test.ident)
2417 }
2418 if def.Pkg() != test.obj.Pkg() {
2419 t.Errorf("Pkg() = %v, want %v", def.Pkg(), test.obj.Pkg())
2420 }
2421 if def.Name() != test.obj.Name() {
2422 t.Errorf("Name() = %v, want %v", def.Name(), test.obj.Name())
2423 }
2424 if def.Pos() != test.obj.Pos() {
2425 t.Errorf("Pos() = %v, want %v", def.Pos(), test.obj.Pos())
2426 }
2427 if def.Parent() != test.obj.Parent() {
2428 t.Fatalf("Parent() = %v, want %v", def.Parent(), test.obj.Parent())
2429 }
2430 if def.Exported() != test.obj.Exported() {
2431 t.Fatalf("Exported() = %v, want %v", def.Exported(), test.obj.Exported())
2432 }
2433 if def.Id() != test.obj.Id() {
2434 t.Fatalf("Id() = %v, want %v", def.Id(), test.obj.Id())
2435 }
2436
2437 })
2438 }
2439 }
2440
2441 func TestImplements(t *testing.T) {
2442 const src = `
2443 package p
2444
2445 type EmptyIface interface{}
2446
2447 type I interface {
2448 m()
2449 }
2450
2451 type C interface {
2452 m()
2453 ~int
2454 }
2455
2456 type Integer interface{
2457 int8 | int16 | int32 | int64
2458 }
2459
2460 type EmptyTypeSet interface{
2461 Integer
2462 ~string
2463 }
2464
2465 type N1 int
2466 func (N1) m() {}
2467
2468 type N2 int
2469 func (*N2) m() {}
2470
2471 type N3 int
2472 func (N3) m(int) {}
2473
2474 type N4 string
2475 func (N4) m()
2476
2477 type Bad Bad // invalid type
2478 `
2479
2480 f, err := parseSrc("p.go", src)
2481 if err != nil {
2482 t.Fatal(err)
2483 }
2484 conf := Config{Error: func(error) {}}
2485 pkg, _ := conf.Check(f.PkgName.Value, []*syntax.File{f}, nil)
2486
2487 lookup := func(tname string) Type { return pkg.Scope().Lookup(tname).Type() }
2488 var (
2489 EmptyIface = lookup("EmptyIface").Underlying().(*Interface)
2490 I = lookup("I").(*Named)
2491 II = I.Underlying().(*Interface)
2492 C = lookup("C").(*Named)
2493 CI = C.Underlying().(*Interface)
2494 Integer = lookup("Integer").Underlying().(*Interface)
2495 EmptyTypeSet = lookup("EmptyTypeSet").Underlying().(*Interface)
2496 N1 = lookup("N1")
2497 N1p = NewPointer(N1)
2498 N2 = lookup("N2")
2499 N2p = NewPointer(N2)
2500 N3 = lookup("N3")
2501 N4 = lookup("N4")
2502 Bad = lookup("Bad")
2503 )
2504
2505 tests := []struct {
2506 V Type
2507 T *Interface
2508 want bool
2509 }{
2510 {I, II, true},
2511 {I, CI, false},
2512 {C, II, true},
2513 {C, CI, true},
2514 {Typ[Int8], Integer, true},
2515 {Typ[Int64], Integer, true},
2516 {Typ[String], Integer, false},
2517 {EmptyTypeSet, II, true},
2518 {EmptyTypeSet, EmptyTypeSet, true},
2519 {Typ[Int], EmptyTypeSet, false},
2520 {N1, II, true},
2521 {N1, CI, true},
2522 {N1p, II, true},
2523 {N1p, CI, false},
2524 {N2, II, false},
2525 {N2, CI, false},
2526 {N2p, II, true},
2527 {N2p, CI, false},
2528 {N3, II, false},
2529 {N3, CI, false},
2530 {N4, II, true},
2531 {N4, CI, false},
2532 {Bad, II, false},
2533 {Bad, CI, false},
2534 {Bad, EmptyIface, true},
2535 }
2536
2537 for _, test := range tests {
2538 if got := Implements(test.V, test.T); got != test.want {
2539 t.Errorf("Implements(%s, %s) = %t, want %t", test.V, test.T, got, test.want)
2540 }
2541
2542
2543
2544 V := test.T
2545 T := test.V
2546 want := false
2547 if _, ok := T.Underlying().(*Interface); (ok || Implements(T, V)) && T != Bad {
2548 want = true
2549 }
2550 if got := AssertableTo(V, T); got != want {
2551 t.Errorf("AssertableTo(%s, %s) = %t, want %t", V, T, got, want)
2552 }
2553 }
2554 }
2555
2556 func TestMissingMethodAlternative(t *testing.T) {
2557 const src = `
2558 package p
2559 type T interface {
2560 m()
2561 }
2562
2563 type V0 struct{}
2564 func (V0) m() {}
2565
2566 type V1 struct{}
2567
2568 type V2 struct{}
2569 func (V2) m() int
2570
2571 type V3 struct{}
2572 func (*V3) m()
2573
2574 type V4 struct{}
2575 func (V4) M()
2576 `
2577
2578 pkg, err := pkgFor("p.go", src, nil)
2579 if err != nil {
2580 t.Fatal(err)
2581 }
2582
2583 T := pkg.Scope().Lookup("T").Type().Underlying().(*Interface)
2584 lookup := func(name string) (*Func, bool) {
2585 return MissingMethod(pkg.Scope().Lookup(name).Type(), T, true)
2586 }
2587
2588
2589 method, wrongType := lookup("V0")
2590 if method != nil || wrongType {
2591 t.Fatalf("V0: got method = %v, wrongType = %v", method, wrongType)
2592 }
2593
2594 checkMissingMethod := func(tname string, reportWrongType bool) {
2595 method, wrongType := lookup(tname)
2596 if method == nil || method.Name() != "m" || wrongType != reportWrongType {
2597 t.Fatalf("%s: got method = %v, wrongType = %v", tname, method, wrongType)
2598 }
2599 }
2600
2601
2602 checkMissingMethod("V1", false)
2603
2604
2605 checkMissingMethod("V2", true)
2606
2607
2608 checkMissingMethod("V3", true)
2609
2610
2611 checkMissingMethod("V4", false)
2612 }
2613
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