1 // Copyright 2013 The Go Authors. All rights reserved.
2 // Use of this source code is governed by a BSD-style
3 // license that can be found in the LICENSE file.
9 "cmd/compile/internal/syntax"
17 . "cmd/compile/internal/types2"
20 // brokenPkg is a source prefix for packages that are not expected to parse
21 // or type-check cleanly. They are always parsed assuming that they contain
23 const brokenPkg = "package broken_"
25 func parseSrc(path, src string) (*syntax.File, error) {
26 errh := func(error) {} // dummy error handler so that parsing continues in presence of errors
27 return syntax.Parse(syntax.NewFileBase(path), strings.NewReader(src), errh, nil, syntax.AllowGenerics)
30 func pkgFor(path, source string, info *Info) (*Package, error) {
31 f, err := parseSrc(path, source)
35 conf := Config{Importer: defaultImporter()}
36 return conf.Check(f.PkgName.Value, []*syntax.File{f}, info)
39 func mustTypecheck(t *testing.T, path, source string, info *Info) string {
40 pkg, err := pkgFor(path, source, info)
44 name = "package " + pkg.Name()
46 t.Fatalf("%s: didn't type-check (%s)", name, err)
51 func mayTypecheck(t *testing.T, path, source string, info *Info) (string, error) {
52 f, err := parseSrc(path, source)
53 if f == nil { // ignore errors unless f is nil
54 t.Fatalf("%s: unable to parse: %s", path, err)
57 Error: func(err error) {},
58 Importer: defaultImporter(),
60 pkg, err := conf.Check(f.PkgName.Value, []*syntax.File{f}, info)
61 return pkg.Name(), err
64 func TestValuesInfo(t *testing.T) {
65 var tests = []struct {
67 expr string // constant expression
68 typ string // constant type
69 val string // constant value
71 {`package a0; const _ = false`, `false`, `untyped bool`, `false`},
72 {`package a1; const _ = 0`, `0`, `untyped int`, `0`},
73 {`package a2; const _ = 'A'`, `'A'`, `untyped rune`, `65`},
74 {`package a3; const _ = 0.`, `0.`, `untyped float`, `0`},
75 {`package a4; const _ = 0i`, `0i`, `untyped complex`, `(0 + 0i)`},
76 {`package a5; const _ = "foo"`, `"foo"`, `untyped string`, `"foo"`},
78 {`package b0; var _ = false`, `false`, `bool`, `false`},
79 {`package b1; var _ = 0`, `0`, `int`, `0`},
80 {`package b2; var _ = 'A'`, `'A'`, `rune`, `65`},
81 {`package b3; var _ = 0.`, `0.`, `float64`, `0`},
82 {`package b4; var _ = 0i`, `0i`, `complex128`, `(0 + 0i)`},
83 {`package b5; var _ = "foo"`, `"foo"`, `string`, `"foo"`},
85 {`package c0a; var _ = bool(false)`, `false`, `bool`, `false`},
86 {`package c0b; var _ = bool(false)`, `bool(false)`, `bool`, `false`},
87 {`package c0c; type T bool; var _ = T(false)`, `T(false)`, `c0c.T`, `false`},
89 {`package c1a; var _ = int(0)`, `0`, `int`, `0`},
90 {`package c1b; var _ = int(0)`, `int(0)`, `int`, `0`},
91 {`package c1c; type T int; var _ = T(0)`, `T(0)`, `c1c.T`, `0`},
93 {`package c2a; var _ = rune('A')`, `'A'`, `rune`, `65`},
94 {`package c2b; var _ = rune('A')`, `rune('A')`, `rune`, `65`},
95 {`package c2c; type T rune; var _ = T('A')`, `T('A')`, `c2c.T`, `65`},
97 {`package c3a; var _ = float32(0.)`, `0.`, `float32`, `0`},
98 {`package c3b; var _ = float32(0.)`, `float32(0.)`, `float32`, `0`},
99 {`package c3c; type T float32; var _ = T(0.)`, `T(0.)`, `c3c.T`, `0`},
101 {`package c4a; var _ = complex64(0i)`, `0i`, `complex64`, `(0 + 0i)`},
102 {`package c4b; var _ = complex64(0i)`, `complex64(0i)`, `complex64`, `(0 + 0i)`},
103 {`package c4c; type T complex64; var _ = T(0i)`, `T(0i)`, `c4c.T`, `(0 + 0i)`},
105 {`package c5a; var _ = string("foo")`, `"foo"`, `string`, `"foo"`},
106 {`package c5b; var _ = string("foo")`, `string("foo")`, `string`, `"foo"`},
107 {`package c5c; type T string; var _ = T("foo")`, `T("foo")`, `c5c.T`, `"foo"`},
108 {`package c5d; var _ = string(65)`, `65`, `untyped int`, `65`},
109 {`package c5e; var _ = string('A')`, `'A'`, `untyped rune`, `65`},
110 {`package c5f; type T string; var _ = T('A')`, `'A'`, `untyped rune`, `65`},
111 {`package c5g; var s uint; var _ = string(1 << s)`, `1 << s`, `untyped int`, ``},
113 {`package d0; var _ = []byte("foo")`, `"foo"`, `string`, `"foo"`},
114 {`package d1; var _ = []byte(string("foo"))`, `"foo"`, `string`, `"foo"`},
115 {`package d2; var _ = []byte(string("foo"))`, `string("foo")`, `string`, `"foo"`},
116 {`package d3; type T []byte; var _ = T("foo")`, `"foo"`, `string`, `"foo"`},
118 {`package e0; const _ = float32( 1e-200)`, `float32(1e-200)`, `float32`, `0`},
119 {`package e1; const _ = float32(-1e-200)`, `float32(-1e-200)`, `float32`, `0`},
120 {`package e2; const _ = float64( 1e-2000)`, `float64(1e-2000)`, `float64`, `0`},
121 {`package e3; const _ = float64(-1e-2000)`, `float64(-1e-2000)`, `float64`, `0`},
122 {`package e4; const _ = complex64( 1e-200)`, `complex64(1e-200)`, `complex64`, `(0 + 0i)`},
123 {`package e5; const _ = complex64(-1e-200)`, `complex64(-1e-200)`, `complex64`, `(0 + 0i)`},
124 {`package e6; const _ = complex128( 1e-2000)`, `complex128(1e-2000)`, `complex128`, `(0 + 0i)`},
125 {`package e7; const _ = complex128(-1e-2000)`, `complex128(-1e-2000)`, `complex128`, `(0 + 0i)`},
127 {`package f0 ; var _ float32 = 1e-200`, `1e-200`, `float32`, `0`},
128 {`package f1 ; var _ float32 = -1e-200`, `-1e-200`, `float32`, `0`},
129 {`package f2a; var _ float64 = 1e-2000`, `1e-2000`, `float64`, `0`},
130 {`package f3a; var _ float64 = -1e-2000`, `-1e-2000`, `float64`, `0`},
131 {`package f2b; var _ = 1e-2000`, `1e-2000`, `float64`, `0`},
132 {`package f3b; var _ = -1e-2000`, `-1e-2000`, `float64`, `0`},
133 {`package f4 ; var _ complex64 = 1e-200 `, `1e-200`, `complex64`, `(0 + 0i)`},
134 {`package f5 ; var _ complex64 = -1e-200 `, `-1e-200`, `complex64`, `(0 + 0i)`},
135 {`package f6a; var _ complex128 = 1e-2000i`, `1e-2000i`, `complex128`, `(0 + 0i)`},
136 {`package f7a; var _ complex128 = -1e-2000i`, `-1e-2000i`, `complex128`, `(0 + 0i)`},
137 {`package f6b; var _ = 1e-2000i`, `1e-2000i`, `complex128`, `(0 + 0i)`},
138 {`package f7b; var _ = -1e-2000i`, `-1e-2000i`, `complex128`, `(0 + 0i)`},
140 {`package g0; const (a = len([iota]int{}); b; c); const _ = c`, `c`, `int`, `2`}, // issue #22341
141 {`package g1; var(j int32; s int; n = 1.0<<s == j)`, `1.0`, `int32`, `1`}, // issue #48422
144 for _, test := range tests {
146 Types: make(map[syntax.Expr]TypeAndValue),
148 name := mustTypecheck(t, "ValuesInfo", test.src, &info)
150 // look for expression
152 for e := range info.Types {
153 if syntax.String(e) == test.expr {
159 t.Errorf("package %s: no expression found for %s", name, test.expr)
162 tv := info.Types[expr]
164 // check that type is correct
165 if got := tv.Type.String(); got != test.typ {
166 t.Errorf("package %s: got type %s; want %s", name, got, test.typ)
170 // if we have a constant, check that value is correct
172 if got := tv.Value.ExactString(); got != test.val {
173 t.Errorf("package %s: got value %s; want %s", name, got, test.val)
177 t.Errorf("package %s: no constant found; want %s", name, test.val)
183 func TestTypesInfo(t *testing.T) {
184 var tests = []struct {
186 expr string // expression
187 typ string // value type
189 // single-valued expressions of untyped constants
190 {`package b0; var x interface{} = false`, `false`, `bool`},
191 {`package b1; var x interface{} = 0`, `0`, `int`},
192 {`package b2; var x interface{} = 0.`, `0.`, `float64`},
193 {`package b3; var x interface{} = 0i`, `0i`, `complex128`},
194 {`package b4; var x interface{} = "foo"`, `"foo"`, `string`},
197 {`package n0; var _ *int = nil`, `nil`, `*int`},
198 {`package n1; var _ func() = nil`, `nil`, `func()`},
199 {`package n2; var _ []byte = nil`, `nil`, `[]byte`},
200 {`package n3; var _ map[int]int = nil`, `nil`, `map[int]int`},
201 {`package n4; var _ chan int = nil`, `nil`, `chan int`},
202 {`package n5a; var _ interface{} = (*int)(nil)`, `nil`, `*int`},
203 {`package n5b; var _ interface{m()} = nil`, `nil`, `interface{m()}`},
204 {`package n6; import "unsafe"; var _ unsafe.Pointer = nil`, `nil`, `unsafe.Pointer`},
206 {`package n10; var (x *int; _ = x == nil)`, `nil`, `*int`},
207 {`package n11; var (x func(); _ = x == nil)`, `nil`, `func()`},
208 {`package n12; var (x []byte; _ = x == nil)`, `nil`, `[]byte`},
209 {`package n13; var (x map[int]int; _ = x == nil)`, `nil`, `map[int]int`},
210 {`package n14; var (x chan int; _ = x == nil)`, `nil`, `chan int`},
211 {`package n15a; var (x interface{}; _ = x == (*int)(nil))`, `nil`, `*int`},
212 {`package n15b; var (x interface{m()}; _ = x == nil)`, `nil`, `interface{m()}`},
213 {`package n15; import "unsafe"; var (x unsafe.Pointer; _ = x == nil)`, `nil`, `unsafe.Pointer`},
215 {`package n20; var _ = (*int)(nil)`, `nil`, `*int`},
216 {`package n21; var _ = (func())(nil)`, `nil`, `func()`},
217 {`package n22; var _ = ([]byte)(nil)`, `nil`, `[]byte`},
218 {`package n23; var _ = (map[int]int)(nil)`, `nil`, `map[int]int`},
219 {`package n24; var _ = (chan int)(nil)`, `nil`, `chan int`},
220 {`package n25a; var _ = (interface{})((*int)(nil))`, `nil`, `*int`},
221 {`package n25b; var _ = (interface{m()})(nil)`, `nil`, `interface{m()}`},
222 {`package n26; import "unsafe"; var _ = unsafe.Pointer(nil)`, `nil`, `unsafe.Pointer`},
224 {`package n30; func f(*int) { f(nil) }`, `nil`, `*int`},
225 {`package n31; func f(func()) { f(nil) }`, `nil`, `func()`},
226 {`package n32; func f([]byte) { f(nil) }`, `nil`, `[]byte`},
227 {`package n33; func f(map[int]int) { f(nil) }`, `nil`, `map[int]int`},
228 {`package n34; func f(chan int) { f(nil) }`, `nil`, `chan int`},
229 {`package n35a; func f(interface{}) { f((*int)(nil)) }`, `nil`, `*int`},
230 {`package n35b; func f(interface{m()}) { f(nil) }`, `nil`, `interface{m()}`},
231 {`package n35; import "unsafe"; func f(unsafe.Pointer) { f(nil) }`, `nil`, `unsafe.Pointer`},
233 // comma-ok expressions
234 {`package p0; var x interface{}; var _, _ = x.(int)`,
238 {`package p1; var x interface{}; func _() { _, _ = x.(int) }`,
242 {`package p2a; type mybool bool; var m map[string]complex128; var b mybool; func _() { _, b = m["foo"] }`,
244 `(complex128, p2a.mybool)`,
246 {`package p2b; var m map[string]complex128; var b bool; func _() { _, b = m["foo"] }`,
248 `(complex128, bool)`,
250 {`package p3; var c chan string; var _, _ = <-c`,
256 {`package issue6796_a; var x interface{}; var _, _ = (x.(int))`,
260 {`package issue6796_b; var c chan string; var _, _ = (<-c)`,
264 {`package issue6796_c; var c chan string; var _, _ = (<-c)`,
268 {`package issue6796_d; var c chan string; var _, _ = ((<-c))`,
272 {`package issue6796_e; func f(c chan string) { _, _ = ((<-c)) }`,
278 {`package issue7060_a; var ( m map[int]string; x, ok = m[0] )`,
282 {`package issue7060_b; var ( m map[int]string; x, ok interface{} = m[0] )`,
286 {`package issue7060_c; func f(x interface{}, ok bool, m map[int]string) { x, ok = m[0] }`,
290 {`package issue7060_d; var ( ch chan string; x, ok = <-ch )`,
294 {`package issue7060_e; var ( ch chan string; x, ok interface{} = <-ch )`,
298 {`package issue7060_f; func f(x interface{}, ok bool, ch chan string) { x, ok = <-ch }`,
304 {`package issue28277_a; func f(...int)`,
308 {`package issue28277_b; func f(a, b int, c ...[]struct{})`,
313 // tests for broken code that doesn't parse or type-check
314 {brokenPkg + `x0; func _() { var x struct {f string}; x.f := 0 }`, `x.f`, `string`},
315 {brokenPkg + `x1; func _() { var z string; type x struct {f string}; y := &x{q: z}}`, `z`, `string`},
316 {brokenPkg + `x2; func _() { var a, b string; type x struct {f string}; z := &x{f: a, f: b,}}`, `b`, `string`},
317 {brokenPkg + `x3; var x = panic("");`, `panic`, `func(interface{})`},
318 {`package x4; func _() { panic("") }`, `panic`, `func(interface{})`},
319 {brokenPkg + `x5; func _() { var x map[string][...]int; x = map[string][...]int{"": {1,2,3}} }`, `x`, `map[string]invalid type`},
321 // parameterized functions
322 {`package p0; func f[T any](T) {}; var _ = f[int]`, `f`, `func[T any](T)`},
323 {`package p1; func f[T any](T) {}; var _ = f[int]`, `f[int]`, `func(int)`},
324 {`package p2; func f[T any](T) {}; func _() { f(42) }`, `f`, `func(int)`},
325 {`package p3; func f[T any](T) {}; func _() { f[int](42) }`, `f[int]`, `func(int)`},
326 {`package p4; func f[T any](T) {}; func _() { f[int](42) }`, `f`, `func[T any](T)`},
327 {`package p5; func f[T any](T) {}; func _() { f(42) }`, `f(42)`, `()`},
330 {`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
331 {`package t1; type t[P any] int; var _ t[int]`, `t`, `t1.t[P any]`},
332 {`package t2; type t[P interface{}] int; var _ t[int]`, `t`, `t2.t[P interface{}]`},
333 {`package t3; type t[P, Q interface{}] int; var _ t[int, int]`, `t`, `t3.t[P, Q interface{}]`},
334 {brokenPkg + `t4; type t[P, Q interface{ m() }] int; var _ t[int, int]`, `t`, `broken_t4.t[P, Q interface{m()}]`},
336 // instantiated types must be sanitized
337 {`package g0; type t[P any] int; var x struct{ f t[int] }; var _ = x.f`, `x.f`, `g0.t[int]`},
340 {`package issue45096; func _[T interface{ ~int8 | ~int16 | ~int32 }](x T) { _ = x < 0 }`, `0`, `T`},
343 {`package p; import "unsafe"; type S struct { f int }; var s S; var _ = unsafe.Offsetof(s.f)`, `s.f`, `int`},
346 for _, test := range tests {
347 info := Info{Types: make(map[syntax.Expr]TypeAndValue)}
349 if strings.HasPrefix(test.src, brokenPkg) {
351 name, err = mayTypecheck(t, "TypesInfo", test.src, &info)
353 t.Errorf("package %s: expected to fail but passed", name)
357 name = mustTypecheck(t, "TypesInfo", test.src, &info)
360 // look for expression type
362 for e, tv := range info.Types {
363 if syntax.String(e) == test.expr {
369 t.Errorf("package %s: no type found for %s", name, test.expr)
373 // check that type is correct
374 if got := typ.String(); got != test.typ {
375 t.Errorf("package %s: got %s; want %s", name, got, test.typ)
380 func TestInstanceInfo(t *testing.T) {
381 var tests = []struct {
387 {`package p0; func f[T any](T) {}; func _() { f(42) }`,
392 {`package p1; func f[T any](T) T { panic(0) }; func _() { f('@') }`,
397 {`package p2; func f[T any](...T) T { panic(0) }; func _() { f(0i) }`,
399 []string{`complex128`},
400 `func(...complex128) complex128`,
402 {`package p3; func f[A, B, C any](A, *B, []C) {}; func _() { f(1.2, new(string), []byte{}) }`,
404 []string{`float64`, `string`, `byte`},
405 `func(float64, *string, []byte)`,
407 {`package p4; func f[A, B any](A, *B, ...[]B) {}; func _() { f(1.2, new(byte)) }`,
409 []string{`float64`, `byte`},
410 `func(float64, *byte, ...[]byte)`,
413 // we don't know how to translate these but we can type-check them
414 {`package q0; type T struct{}; func (T) m[P any](P) {}; func _(x T) { x.m(42) }`,
419 {`package q1; type T struct{}; func (T) m[P any](P) P { panic(0) }; func _(x T) { x.m(42) }`,
424 {`package q2; type T struct{}; func (T) m[P any](...P) P { panic(0) }; func _(x T) { x.m(42) }`,
429 {`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{}) }`,
431 []string{`float64`, `string`, `byte`},
432 `func(float64, *string, []byte)`,
434 {`package q4; type T struct{}; func (T) m[A, B any](A, *B, ...[]B) {}; func _(x T) { x.m(1.2, new(byte)) }`,
436 []string{`float64`, `byte`},
437 `func(float64, *byte, ...[]byte)`,
440 {`package r0; type T[P any] struct{}; func (_ T[P]) m[Q any](Q) {}; func _[P any](x T[P]) { x.m(42) }`,
445 // TODO(gri) record method type parameters in syntax.FuncType so we can check this
446 // {`package r1; type T interface{ m[P any](P) }; func _(x T) { x.m(4.2) }`,
448 // []string{`float64`},
452 {`package s1; func f[T any, P interface{~*T}](x T) {}; func _(x string) { f(x) }`,
454 []string{`string`, `*string`},
457 {`package s2; func f[T any, P interface{~*T}](x []T) {}; func _(x []int) { f(x) }`,
459 []string{`int`, `*int`},
462 {`package s3; type C[T any] interface{~chan<- T}; func f[T any, P C[T]](x []T) {}; func _(x []int) { f(x) }`,
464 []string{`int`, `chan<- int`},
467 {`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) }`,
469 []string{`int`, `chan<- int`, `chan<- []*chan<- int`},
473 {`package t1; func f[T any, P interface{~*T}]() T { panic(0) }; func _() { _ = f[string] }`,
475 []string{`string`, `*string`},
478 {`package t2; func f[T any, P interface{~*T}]() T { panic(0) }; func _() { _ = (f[string]) }`,
480 []string{`string`, `*string`},
483 {`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] }`,
485 []string{`int`, `chan<- int`, `chan<- []*chan<- int`},
488 {`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] }`,
490 []string{`int`, `chan<- int`, `chan<- []*chan<- int`},
493 {`package i0; import lib "generic_lib"; func _() { lib.F(42) }`,
498 {`package type0; type T[P interface{~int}] struct{ x P }; var _ T[int]`,
503 {`package type1; type T[P interface{~int}] struct{ x P }; var _ (T[int])`,
508 {`package type2; type T[P interface{~int}] struct{ x P }; var _ T[(int)]`,
513 {`package type3; type T[P1 interface{~[]P2}, P2 any] struct{ x P1; y P2 }; var _ T[[]int, int]`,
515 []string{`[]int`, `int`},
516 `struct{x []int; y int}`,
518 {`package type4; import lib "generic_lib"; var _ lib.T[int]`,
525 for _, test := range tests {
526 const lib = `package generic_lib
533 imports := make(testImporter)
534 conf := Config{Importer: imports}
535 instances := make(map[*syntax.Name]Instance)
536 uses := make(map[*syntax.Name]Object)
537 makePkg := func(src string) *Package {
538 f, err := parseSrc("p.go", src)
542 pkg, err := conf.Check("", []*syntax.File{f}, &Info{Instances: instances, Uses: uses})
546 imports[pkg.Name()] = pkg
550 pkg := makePkg(test.src)
552 // look for instance information
555 for ident, inst := range instances {
556 if syntax.String(ident) == test.name {
557 for i := 0; i < inst.TypeArgs.Len(); i++ {
558 targs = append(targs, inst.TypeArgs.At(i))
562 // Check that we can find the corresponding parameterized type.
563 ptype := uses[ident].Type()
564 lister, _ := ptype.(interface{ TypeParams() *TypeParamList })
565 if lister == nil || lister.TypeParams().Len() == 0 {
566 t.Errorf("package %s: info.Types[%v] = %v, want parameterized type", pkg.Name(), ident, ptype)
570 // Verify the invariant that re-instantiating the generic type with
571 // TypeArgs results in an equivalent type.
572 inst2, err := Instantiate(nil, ptype, targs, true)
574 t.Errorf("Instantiate(%v, %v) failed: %v", ptype, targs, err)
576 if !Identical(inst.Type, inst2) {
577 t.Errorf("%v and %v are not identical", inst.Type, inst2)
583 t.Errorf("package %s: no instance information found for %s", pkg.Name(), test.name)
587 // check that type arguments are correct
588 if len(targs) != len(test.targs) {
589 t.Errorf("package %s: got %d type arguments; want %d", pkg.Name(), len(targs), len(test.targs))
592 for i, targ := range targs {
593 if got := targ.String(); got != test.targs[i] {
594 t.Errorf("package %s, %d. type argument: got %s; want %s", pkg.Name(), i, got, test.targs[i])
599 // check that the types match
600 if got := typ.Underlying().String(); got != test.typ {
601 t.Errorf("package %s: got %s; want %s", pkg.Name(), got, test.typ)
606 func TestDefsInfo(t *testing.T) {
607 var tests = []struct {
612 {`package p0; const x = 42`, `x`, `const p0.x untyped int`},
613 {`package p1; const x int = 42`, `x`, `const p1.x int`},
614 {`package p2; var x int`, `x`, `var p2.x int`},
615 {`package p3; type x int`, `x`, `type p3.x int`},
616 {`package p4; func f()`, `f`, `func p4.f()`},
617 {`package p5; func f() int { x, _ := 1, 2; return x }`, `_`, `var _ int`},
620 for _, test := range tests {
622 Defs: make(map[*syntax.Name]Object),
624 name := mustTypecheck(t, "DefsInfo", test.src, &info)
628 for id, obj := range info.Defs {
629 if id.Value == test.obj {
635 t.Errorf("package %s: %s not found", name, test.obj)
639 if got := def.String(); got != test.want {
640 t.Errorf("package %s: got %s; want %s", name, got, test.want)
645 func TestUsesInfo(t *testing.T) {
646 var tests = []struct {
651 {`package p0; func _() { _ = x }; const x = 42`, `x`, `const p0.x untyped int`},
652 {`package p1; func _() { _ = x }; const x int = 42`, `x`, `const p1.x int`},
653 {`package p2; func _() { _ = x }; var x int`, `x`, `var p2.x int`},
654 {`package p3; func _() { type _ x }; type x int`, `x`, `type p3.x int`},
655 {`package p4; func _() { _ = f }; func f()`, `f`, `func p4.f()`},
658 for _, test := range tests {
660 Uses: make(map[*syntax.Name]Object),
662 name := mustTypecheck(t, "UsesInfo", test.src, &info)
666 for id, obj := range info.Uses {
667 if id.Value == test.obj {
673 t.Errorf("package %s: %s not found", name, test.obj)
677 if got := use.String(); got != test.want {
678 t.Errorf("package %s: got %s; want %s", name, got, test.want)
683 func TestImplicitsInfo(t *testing.T) {
684 testenv.MustHaveGoBuild(t)
686 var tests = []struct {
690 {`package p2; import . "fmt"; var _ = Println`, ""}, // no Implicits entry
691 {`package p0; import local "fmt"; var _ = local.Println`, ""}, // no Implicits entry
692 {`package p1; import "fmt"; var _ = fmt.Println`, "importSpec: package fmt"},
694 {`package p3; func f(x interface{}) { switch x.(type) { case int: } }`, ""}, // no Implicits entry
695 {`package p4; func f(x interface{}) { switch t := x.(type) { case int: _ = t } }`, "caseClause: var t int"},
696 {`package p5; func f(x interface{}) { switch t := x.(type) { case int, uint: _ = t } }`, "caseClause: var t interface{}"},
697 {`package p6; func f(x interface{}) { switch t := x.(type) { default: _ = t } }`, "caseClause: var t interface{}"},
699 {`package p7; func f(x int) {}`, ""}, // no Implicits entry
700 {`package p8; func f(int) {}`, "field: var int"},
701 {`package p9; func f() (complex64) { return 0 }`, "field: var complex64"},
702 {`package p10; type T struct{}; func (*T) f() {}`, "field: var *p10.T"},
705 for _, test := range tests {
707 Implicits: make(map[syntax.Node]Object),
709 name := mustTypecheck(t, "ImplicitsInfo", test.src, &info)
711 // the test cases expect at most one Implicits entry
712 if len(info.Implicits) > 1 {
713 t.Errorf("package %s: %d Implicits entries found", name, len(info.Implicits))
717 // extract Implicits entry, if any
719 for n, obj := range info.Implicits {
720 switch x := n.(type) {
721 case *syntax.ImportDecl:
723 case *syntax.CaseClause:
728 t.Fatalf("package %s: unexpected %T", name, x)
730 got += ": " + obj.String()
734 if got != test.want {
735 t.Errorf("package %s: got %q; want %q", name, got, test.want)
740 func predString(tv TypeAndValue) string {
742 pred := func(b bool, s string) {
745 buf.WriteString(", ")
751 pred(tv.IsVoid(), "void")
752 pred(tv.IsType(), "type")
753 pred(tv.IsBuiltin(), "builtin")
754 pred(tv.IsValue() && tv.Value != nil, "const")
755 pred(tv.IsValue() && tv.Value == nil, "value")
756 pred(tv.IsNil(), "nil")
757 pred(tv.Addressable(), "addressable")
758 pred(tv.Assignable(), "assignable")
759 pred(tv.HasOk(), "hasOk")
767 func TestPredicatesInfo(t *testing.T) {
768 testenv.MustHaveGoBuild(t)
770 var tests = []struct {
776 {`package n0; func f() { f() }`, `f()`, `void`},
779 {`package t0; type _ int`, `int`, `type`},
780 {`package t1; type _ []int`, `[]int`, `type`},
781 {`package t2; type _ func()`, `func()`, `type`},
782 {`package t3; type _ func(int)`, `int`, `type`},
783 {`package t3; type _ func(...int)`, `...int`, `type`},
786 {`package b0; var _ = len("")`, `len`, `builtin`},
787 {`package b1; var _ = (len)("")`, `(len)`, `builtin`},
790 {`package c0; var _ = 42`, `42`, `const`},
791 {`package c1; var _ = "foo" + "bar"`, `"foo" + "bar"`, `const`},
792 {`package c2; const (i = 1i; _ = i)`, `i`, `const`},
795 {`package v0; var (a, b int; _ = a + b)`, `a + b`, `value`},
796 {`package v1; var _ = &[]int{1}`, `[]int{…}`, `value`},
797 {`package v2; var _ = func(){}`, `func() {}`, `value`},
798 {`package v4; func f() { _ = f }`, `f`, `value`},
799 {`package v3; var _ *int = nil`, `nil`, `value, nil`},
800 {`package v3; var _ *int = (nil)`, `(nil)`, `value, nil`},
802 // addressable (and thus assignable) operands
803 {`package a0; var (x int; _ = x)`, `x`, `value, addressable, assignable`},
804 {`package a1; var (p *int; _ = *p)`, `*p`, `value, addressable, assignable`},
805 {`package a2; var (s []int; _ = s[0])`, `s[0]`, `value, addressable, assignable`},
806 {`package a3; var (s struct{f int}; _ = s.f)`, `s.f`, `value, addressable, assignable`},
807 {`package a4; var (a [10]int; _ = a[0])`, `a[0]`, `value, addressable, assignable`},
808 {`package a5; func _(x int) { _ = x }`, `x`, `value, addressable, assignable`},
809 {`package a6; func _()(x int) { _ = x; return }`, `x`, `value, addressable, assignable`},
810 {`package a7; type T int; func (x T) _() { _ = x }`, `x`, `value, addressable, assignable`},
811 // composite literals are not addressable
813 // assignable but not addressable values
814 {`package s0; var (m map[int]int; _ = m[0])`, `m[0]`, `value, assignable, hasOk`},
815 {`package s1; var (m map[int]int; _, _ = m[0])`, `m[0]`, `value, assignable, hasOk`},
818 {`package k0; var (ch chan int; _ = <-ch)`, `<-ch`, `value, hasOk`},
819 {`package k1; var (ch chan int; _, _ = <-ch)`, `<-ch`, `value, hasOk`},
822 // - package names are collected in the Uses map
823 // - identifiers being declared are collected in the Defs map
824 {`package m0; import "os"; func _() { _ = os.Stdout }`, `os`, `<missing>`},
825 {`package m1; import p "os"; func _() { _ = p.Stdout }`, `p`, `<missing>`},
826 {`package m2; const c = 0`, `c`, `<missing>`},
827 {`package m3; type T int`, `T`, `<missing>`},
828 {`package m4; var v int`, `v`, `<missing>`},
829 {`package m5; func f() {}`, `f`, `<missing>`},
830 {`package m6; func _(x int) {}`, `x`, `<missing>`},
831 {`package m6; func _()(x int) { return }`, `x`, `<missing>`},
832 {`package m6; type T int; func (x T) _() {}`, `x`, `<missing>`},
835 for _, test := range tests {
836 info := Info{Types: make(map[syntax.Expr]TypeAndValue)}
837 name := mustTypecheck(t, "PredicatesInfo", test.src, &info)
839 // look for expression predicates
841 for e, tv := range info.Types {
842 //println(name, syntax.String(e))
843 if syntax.String(e) == test.expr {
849 if got != test.pred {
850 t.Errorf("package %s: got %s; want %s", name, got, test.pred)
855 func TestScopesInfo(t *testing.T) {
856 testenv.MustHaveGoBuild(t)
858 var tests = []struct {
860 scopes []string // list of scope descriptors of the form kind:varlist
862 {`package p0`, []string{
865 {`package p1; import ( "fmt"; m "math"; _ "os" ); var ( _ = fmt.Println; _ = m.Pi )`, []string{
868 {`package p2; func _() {}`, []string{
871 {`package p3; func _(x, y int) {}`, []string{
874 {`package p4; func _(x, y int) { x, z := 1, 2; _ = z }`, []string{
875 "file:", "func:x y z", // redeclaration of x
877 {`package p5; func _(x, y int) (u, _ int) { return }`, []string{
878 "file:", "func:u x y",
880 {`package p6; func _() { { var x int; _ = x } }`, []string{
881 "file:", "func:", "block:x",
883 {`package p7; func _() { if true {} }`, []string{
884 "file:", "func:", "if:", "block:",
886 {`package p8; func _() { if x := 0; x < 0 { y := x; _ = y } }`, []string{
887 "file:", "func:", "if:x", "block:y",
889 {`package p9; func _() { switch x := 0; x {} }`, []string{
890 "file:", "func:", "switch:x",
892 {`package p10; func _() { switch x := 0; x { case 1: y := x; _ = y; default: }}`, []string{
893 "file:", "func:", "switch:x", "case:y", "case:",
895 {`package p11; func _(t interface{}) { switch t.(type) {} }`, []string{
896 "file:", "func:t", "switch:",
898 {`package p12; func _(t interface{}) { switch t := t; t.(type) {} }`, []string{
899 "file:", "func:t", "switch:t",
901 {`package p13; func _(t interface{}) { switch x := t.(type) { case int: _ = x } }`, []string{
902 "file:", "func:t", "switch:", "case:x", // x implicitly declared
904 {`package p14; func _() { select{} }`, []string{
907 {`package p15; func _(c chan int) { select{ case <-c: } }`, []string{
908 "file:", "func:c", "comm:",
910 {`package p16; func _(c chan int) { select{ case i := <-c: x := i; _ = x} }`, []string{
911 "file:", "func:c", "comm:i x",
913 {`package p17; func _() { for{} }`, []string{
914 "file:", "func:", "for:", "block:",
916 {`package p18; func _(n int) { for i := 0; i < n; i++ { _ = i } }`, []string{
917 "file:", "func:n", "for:i", "block:",
919 {`package p19; func _(a []int) { for i := range a { _ = i} }`, []string{
920 "file:", "func:a", "for:i", "block:",
922 {`package p20; var s int; func _(a []int) { for i, x := range a { s += x; _ = i } }`, []string{
923 "file:", "func:a", "for:i x", "block:",
927 for _, test := range tests {
928 info := Info{Scopes: make(map[syntax.Node]*Scope)}
929 name := mustTypecheck(t, "ScopesInfo", test.src, &info)
931 // number of scopes must match
932 if len(info.Scopes) != len(test.scopes) {
933 t.Errorf("package %s: got %d scopes; want %d", name, len(info.Scopes), len(test.scopes))
936 // scope descriptions must match
937 for node, scope := range info.Scopes {
942 case *syntax.FuncType:
944 case *syntax.BlockStmt:
948 case *syntax.SwitchStmt:
950 case *syntax.SelectStmt:
952 case *syntax.CaseClause:
954 case *syntax.CommClause:
956 case *syntax.ForStmt:
959 kind = fmt.Sprintf("%T", node)
962 // look for matching scope description
963 desc := kind + ":" + strings.Join(scope.Names(), " ")
965 for _, d := range test.scopes {
972 t.Errorf("package %s: no matching scope found for %s", name, desc)
978 func TestInitOrderInfo(t *testing.T) {
979 var tests = []struct {
983 {`package p0; var (x = 1; y = x)`, []string{
986 {`package p1; var (a = 1; b = 2; c = 3)`, []string{
987 "a = 1", "b = 2", "c = 3",
989 {`package p2; var (a, b, c = 1, 2, 3)`, []string{
990 "a = 1", "b = 2", "c = 3",
992 {`package p3; var _ = f(); func f() int { return 1 }`, []string{
993 "_ = f()", // blank var
995 {`package p4; var (a = 0; x = y; y = z; z = 0)`, []string{
996 "a = 0", "z = 0", "y = z", "x = y",
998 {`package p5; var (a, _ = m[0]; m map[int]string)`, []string{
999 "a, _ = m[0]", // blank var
1001 {`package p6; var a, b = f(); func f() (_, _ int) { return z, z }; var z = 0`, []string{
1002 "z = 0", "a, b = f()",
1004 {`package p7; var (a = func() int { return b }(); b = 1)`, []string{
1005 "b = 1", "a = func() int {…}()",
1007 {`package p8; var (a, b = func() (_, _ int) { return c, c }(); c = 1)`, []string{
1008 "c = 1", "a, b = func() (_, _ int) {…}()",
1010 {`package p9; type T struct{}; func (T) m() int { _ = y; return 0 }; var x, y = T.m, 1`, []string{
1013 {`package p10; var (d = c + b; a = 0; b = 0; c = 0)`, []string{
1014 "a = 0", "b = 0", "c = 0", "d = c + b",
1016 {`package p11; var (a = e + c; b = d + c; c = 0; d = 0; e = 0)`, []string{
1017 "c = 0", "d = 0", "b = d + c", "e = 0", "a = e + c",
1019 // emit an initializer for n:1 initializations only once (not for each node
1020 // on the lhs which may appear in different order in the dependency graph)
1021 {`package p12; var (a = x; b = 0; x, y = m[0]; m map[int]int)`, []string{
1022 "b = 0", "x, y = m[0]", "a = x",
1024 // test case from spec section on package initialization
1038 "d = 3", "b = f()", "c = f()", "a = c + b",
1040 // test case for issue 7131
1044 func next() int { counter++; return counter }
1047 func makeOrder() []int { return []int{f, b, d, e, c, a} }
1050 var b, c = next(), next()
1051 var d, e, f = next(), next(), next()
1053 "a = next()", "b = next()", "c = next()", "d = next()", "e = next()", "f = next()", "_ = makeOrder()",
1055 // test case for issue 10709
1065 func (T) m() int { return 0 }
1067 func makeT(n int) T {
1073 "t = makeT(0)", "v = t.m()",
1075 // test case for issue 10709: same as test before, but variable decls swapped
1085 func (T) m() int { return 0 }
1087 func makeT(n int) T {
1093 "t = makeT(0)", "v = t.m()",
1095 // another candidate possibly causing problems with issue 10709
1100 func f1() int { return g1() }
1101 func g1() int { f1(); return x1 }
1107 func f2() int { return g2() }
1108 func g2() int { return x2 }
1110 var x2 = 0`, []string{
1111 "x1 = 0", "y1 = f1()", "x2 = 0", "y2 = f2()",
1115 for _, test := range tests {
1117 name := mustTypecheck(t, "InitOrderInfo", test.src, &info)
1119 // number of initializers must match
1120 if len(info.InitOrder) != len(test.inits) {
1121 t.Errorf("package %s: got %d initializers; want %d", name, len(info.InitOrder), len(test.inits))
1125 // initializers must match
1126 for i, want := range test.inits {
1127 got := info.InitOrder[i].String()
1129 t.Errorf("package %s, init %d: got %s; want %s", name, i, got, want)
1136 func TestMultiFileInitOrder(t *testing.T) {
1137 mustParse := func(src string) *syntax.File {
1138 f, err := parseSrc("main", src)
1145 fileA := mustParse(`package main; var a = 1`)
1146 fileB := mustParse(`package main; var b = 2`)
1148 // The initialization order must not depend on the parse
1149 // order of the files, only on the presentation order to
1150 // the type-checker.
1151 for _, test := range []struct {
1152 files []*syntax.File
1155 {[]*syntax.File{fileA, fileB}, "[a = 1 b = 2]"},
1156 {[]*syntax.File{fileB, fileA}, "[b = 2 a = 1]"},
1159 if _, err := new(Config).Check("main", test.files, &info); err != nil {
1162 if got := fmt.Sprint(info.InitOrder); got != test.want {
1163 t.Fatalf("got %s; want %s", got, test.want)
1168 func TestFiles(t *testing.T) {
1169 var sources = []string{
1170 "package p; type T struct{}; func (T) m1() {}",
1171 "package p; func (T) m2() {}; var x interface{ m1(); m2() } = T{}",
1172 "package p; func (T) m3() {}; var y interface{ m1(); m2(); m3() } = T{}",
1177 pkg := NewPackage("p", "p")
1179 check := NewChecker(&conf, pkg, &info)
1181 for i, src := range sources {
1182 filename := fmt.Sprintf("sources%d", i)
1183 f, err := parseSrc(filename, src)
1187 if err := check.Files([]*syntax.File{f}); err != nil {
1192 // check InitOrder is [x y]
1194 for _, init := range info.InitOrder {
1195 for _, v := range init.Lhs {
1196 vars = append(vars, v.Name())
1199 if got, want := fmt.Sprint(vars), "[x y]"; got != want {
1200 t.Errorf("InitOrder == %s, want %s", got, want)
1204 type testImporter map[string]*Package
1206 func (m testImporter) Import(path string) (*Package, error) {
1207 if pkg := m[path]; pkg != nil {
1210 return nil, fmt.Errorf("package %q not found", path)
1213 func TestSelection(t *testing.T) {
1214 selections := make(map[*syntax.SelectorExpr]*Selection)
1216 imports := make(testImporter)
1217 conf := Config{Importer: imports}
1218 makePkg := func(path, src string) {
1219 f, err := parseSrc(path+".go", src)
1223 pkg, err := conf.Check(path, []*syntax.File{f}, &Info{Selections: selections})
1261 // qualified identifiers
1295 // method expressions
1302 wantOut := map[string][2]string{
1303 "lib.T.M": {"method expr (lib.T) M(lib.T)", ".[0]"},
1305 "A{}.B": {"field (main.A) B *main.B", ".[0]"},
1306 "new(A).B": {"field (*main.A) B *main.B", "->[0]"},
1307 "A{}.C": {"field (main.A) C main.C", ".[1]"},
1308 "new(A).C": {"field (*main.A) C main.C", "->[1]"},
1309 "A{}.b": {"field (main.A) b int", "->[0 0]"},
1310 "new(A).b": {"field (*main.A) b int", "->[0 0]"},
1311 "A{}.c": {"field (main.A) c int", ".[1 0]"},
1312 "new(A).c": {"field (*main.A) c int", "->[1 0]"},
1314 "A{}.f": {"method (main.A) f(int)", "->[0 0]"},
1315 "new(A).f": {"method (*main.A) f(int)", "->[0 0]"},
1316 "A{}.g": {"method (main.A) g()", ".[1 0]"},
1317 "new(A).g": {"method (*main.A) g()", "->[1 0]"},
1318 "new(A).h": {"method (*main.A) h()", "->[1 1]"}, // TODO(gri) should this report .[1 1] ?
1319 "B{}.f": {"method (main.B) f(int)", ".[0]"},
1320 "new(B).f": {"method (*main.B) f(int)", "->[0]"},
1321 "C{}.g": {"method (main.C) g()", ".[0]"},
1322 "new(C).g": {"method (*main.C) g()", "->[0]"},
1323 "new(C).h": {"method (*main.C) h()", "->[1]"}, // TODO(gri) should this report .[1] ?
1325 "A.f": {"method expr (main.A) f(main.A, int)", "->[0 0]"},
1326 "(*A).f": {"method expr (*main.A) f(*main.A, int)", "->[0 0]"},
1327 "B.f": {"method expr (main.B) f(main.B, int)", ".[0]"},
1328 "(*B).f": {"method expr (*main.B) f(*main.B, int)", "->[0]"},
1331 makePkg("lib", libSrc)
1332 makePkg("main", mainSrc)
1334 for e, sel := range selections {
1335 _ = sel.String() // assertion: must not panic
1337 start := indexFor(mainSrc, syntax.StartPos(e))
1338 end := indexFor(mainSrc, syntax.EndPos(e))
1339 segment := mainSrc[start:end] // (all SelectorExprs are in main, not lib)
1347 fmt.Sprintf("%s%v", direct, sel.Index()),
1349 want := wantOut[segment]
1351 t.Errorf("%s: got %q; want %q", segment, got, want)
1353 delete(wantOut, segment)
1355 // We must explicitly assert properties of the
1356 // Signature's receiver since it doesn't participate
1357 // in Identical() or String().
1358 sig, _ := sel.Type().(*Signature)
1359 if sel.Kind() == MethodVal {
1360 got := sig.Recv().Type()
1362 if !Identical(got, want) {
1363 t.Errorf("%s: Recv() = %s, want %s", segment, got, want)
1365 } else if sig != nil && sig.Recv() != nil {
1366 t.Errorf("%s: signature has receiver %s", sig, sig.Recv().Type())
1369 // Assert that all wantOut entries were used exactly once.
1370 for segment := range wantOut {
1371 t.Errorf("no syntax.Selection found with syntax %q", segment)
1375 // indexFor returns the index into s corresponding to the position pos.
1376 func indexFor(s string, pos syntax.Pos) int {
1377 i, line := 0, 1 // string index and corresponding line
1378 target := int(pos.Line())
1379 for line < target && i < len(s) {
1385 return i + int(pos.Col()-1) // columns are 1-based
1388 func TestIssue8518(t *testing.T) {
1389 imports := make(testImporter)
1391 Error: func(err error) { t.Log(err) }, // don't exit after first error
1394 makePkg := func(path, src string) {
1395 f, err := parseSrc(path, src)
1399 pkg, _ := conf.Check(path, []*syntax.File{f}, nil) // errors logged via conf.Error
1407 const C2 = missing.C
1417 makePkg("a", libSrc)
1418 makePkg("main", mainSrc) // don't crash when type-checking this package
1421 func TestLookupFieldOrMethod(t *testing.T) {
1422 // Test cases assume a lookup of the form a.f or x.f, where a stands for an
1423 // addressable value, and x for a non-addressable value (even though a variable
1424 // for ease of test case writing).
1425 var tests = []struct {
1432 {"var x T; type T struct{}", false, nil, false},
1433 {"var x T; type T struct{ f int }", true, []int{0}, false},
1434 {"var x T; type T struct{ a, b, f, c int }", true, []int{2}, false},
1437 {"var a T; type T struct{}; func (T) f() {}", true, []int{0}, false},
1438 {"var a *T; type T struct{}; func (T) f() {}", true, []int{0}, true},
1439 {"var a T; type T struct{}; func (*T) f() {}", true, []int{0}, false},
1440 {"var a *T; type T struct{}; func (*T) f() {}", true, []int{0}, true}, // TODO(gri) should this report indirect = false?
1443 {"type ( E1 struct{ f int }; E2 struct{ f int }; x struct{ E1; *E2 })", false, []int{1, 0}, false},
1444 {"type ( E1 struct{ f int }; E2 struct{}; x struct{ E1; *E2 }); func (E2) f() {}", false, []int{1, 0}, false},
1446 // outside methodset
1447 // (*T).f method exists, but value of type T is not addressable
1448 {"var x T; type T struct{}; func (*T) f() {}", false, nil, true},
1451 for _, test := range tests {
1452 pkg, err := pkgFor("test", "package p;"+test.src, nil)
1454 t.Errorf("%s: incorrect test case: %s", test.src, err)
1458 obj := pkg.Scope().Lookup("a")
1460 if obj = pkg.Scope().Lookup("x"); obj == nil {
1461 t.Errorf("%s: incorrect test case - no object a or x", test.src)
1466 f, index, indirect := LookupFieldOrMethod(obj.Type(), obj.Name() == "a", pkg, "f")
1467 if (f != nil) != test.found {
1469 t.Errorf("%s: got no object; want one", test.src)
1471 t.Errorf("%s: got object = %v; want none", test.src, f)
1474 if !sameSlice(index, test.index) {
1475 t.Errorf("%s: got index = %v; want %v", test.src, index, test.index)
1477 if indirect != test.indirect {
1478 t.Errorf("%s: got indirect = %v; want %v", test.src, indirect, test.indirect)
1483 func sameSlice(a, b []int) bool {
1484 if len(a) != len(b) {
1487 for i, x := range a {
1495 // TestScopeLookupParent ensures that (*Scope).LookupParent returns
1496 // the correct result at various positions within the source.
1497 func TestScopeLookupParent(t *testing.T) {
1498 imports := make(testImporter)
1499 conf := Config{Importer: imports}
1501 makePkg := func(path, src string) {
1502 f, err := parseSrc(path, src)
1506 imports[path], err = conf.Check(path, []*syntax.File{f}, &info)
1512 makePkg("lib", "package lib; var X int")
1513 // Each /*name=kind:line*/ comment makes the test look up the
1514 // name at that point and checks that it resolves to a decl of
1515 // the specified kind and line number. "undef" means undefined.
1517 /*lib=pkgname:5*/ /*X=var:1*/ /*Pi=const:8*/ /*T=typename:9*/ /*Y=var:10*/ /*F=func:12*/
1528 const pi, e = 3.1415, /*pi=undef*/ 2.71828 /*pi=const:13*/ /*e=const:13*/
1529 type /*t=undef*/ t /*t=typename:14*/ *t
1530 print(Y) /*Y=var:10*/
1531 x, Y := Y, /*x=undef*/ /*Y=var:10*/ Pi /*x=var:16*/ /*Y=var:16*/ ; _ = x; _ = Y
1532 var F = /*F=func:12*/ F /*F=var:17*/ ; _ = F
1535 for i, x := range /*i=undef*/ /*x=var:16*/ a /*i=var:20*/ /*x=var:20*/ { _ = i; _ = x }
1538 switch y := i.(type) { /*y=undef*/
1539 case /*y=undef*/ int /*y=var:23*/ :
1540 case float32, /*y=undef*/ float64 /*y=var:23*/ :
1541 default /*y=var:23*/:
1546 switch int := i.(type) {
1547 case /*int=typename:0*/ int /*int=var:31*/ :
1549 default /*int=var:31*/ :
1555 info.Uses = make(map[*syntax.Name]Object)
1556 makePkg("main", mainSrc)
1557 mainScope := imports["main"].Scope()
1559 rx := regexp.MustCompile(`^/\*(\w*)=([\w:]*)\*/$`)
1561 base := syntax.NewFileBase("main")
1562 syntax.CommentsDo(strings.NewReader(mainSrc), func(line, col uint, text string) {
1563 pos := syntax.MakePos(base, line, col)
1565 // Syntax errors are not comments.
1567 t.Errorf("%s: %s", pos, text)
1571 // Parse the assertion in the comment.
1572 m := rx.FindStringSubmatch(text)
1574 t.Errorf("%s: bad comment: %s", pos, text)
1577 name, want := m[1], m[2]
1579 // Look up the name in the innermost enclosing scope.
1580 inner := mainScope.Innermost(pos)
1582 t.Errorf("%s: at %s: can't find innermost scope", pos, text)
1586 if _, obj := inner.LookupParent(name, pos); obj != nil {
1587 kind := strings.ToLower(strings.TrimPrefix(reflect.TypeOf(obj).String(), "*types2."))
1588 got = fmt.Sprintf("%s:%d", kind, obj.Pos().Line())
1591 t.Errorf("%s: at %s: %s resolved to %s, want %s", pos, text, name, got, want)
1595 // Check that for each referring identifier,
1596 // a lookup of its name on the innermost
1597 // enclosing scope returns the correct object.
1599 for id, wantObj := range info.Uses {
1600 inner := mainScope.Innermost(id.Pos())
1602 t.Errorf("%s: can't find innermost scope enclosing %q", id.Pos(), id.Value)
1606 // Exclude selectors and qualified identifiers---lexical
1607 // refs only. (Ideally, we'd see if the AST parent is a
1608 // SelectorExpr, but that requires PathEnclosingInterval
1609 // from golang.org/x/tools/go/ast/astutil.)
1610 if id.Value == "X" {
1614 _, gotObj := inner.LookupParent(id.Value, id.Pos())
1615 if gotObj != wantObj {
1616 t.Errorf("%s: got %v, want %v", id.Pos(), gotObj, wantObj)
1622 var nopos syntax.Pos
1624 // newDefined creates a new defined type named T with the given underlying type.
1625 func newDefined(underlying Type) *Named {
1626 tname := NewTypeName(nopos, nil, "T", nil)
1627 return NewNamed(tname, underlying, nil)
1630 func TestConvertibleTo(t *testing.T) {
1631 for _, test := range []struct {
1635 {Typ[Int], Typ[Int], true},
1636 {Typ[Int], Typ[Float32], true},
1637 {Typ[Int], Typ[String], true},
1638 {newDefined(Typ[Int]), Typ[Int], true},
1639 {newDefined(new(Struct)), new(Struct), true},
1640 {newDefined(Typ[Int]), new(Struct), false},
1641 {Typ[UntypedInt], Typ[Int], true},
1642 {NewSlice(Typ[Int]), NewPointer(NewArray(Typ[Int], 10)), true},
1643 {NewSlice(Typ[Int]), NewArray(Typ[Int], 10), false},
1644 {NewSlice(Typ[Int]), NewPointer(NewArray(Typ[Uint], 10)), false},
1645 // Untyped string values are not permitted by the spec, so the behavior below is undefined.
1646 {Typ[UntypedString], Typ[String], true},
1648 if got := ConvertibleTo(test.v, test.t); got != test.want {
1649 t.Errorf("ConvertibleTo(%v, %v) = %t, want %t", test.v, test.t, got, test.want)
1654 func TestAssignableTo(t *testing.T) {
1655 for _, test := range []struct {
1659 {Typ[Int], Typ[Int], true},
1660 {Typ[Int], Typ[Float32], false},
1661 {newDefined(Typ[Int]), Typ[Int], false},
1662 {newDefined(new(Struct)), new(Struct), true},
1663 {Typ[UntypedBool], Typ[Bool], true},
1664 {Typ[UntypedString], Typ[Bool], false},
1665 // Neither untyped string nor untyped numeric assignments arise during
1666 // normal type checking, so the below behavior is technically undefined by
1668 {Typ[UntypedString], Typ[String], true},
1669 {Typ[UntypedInt], Typ[Int], true},
1671 if got := AssignableTo(test.v, test.t); got != test.want {
1672 t.Errorf("AssignableTo(%v, %v) = %t, want %t", test.v, test.t, got, test.want)
1677 func TestIdentical_issue15173(t *testing.T) {
1678 // Identical should allow nil arguments and be symmetric.
1679 for _, test := range []struct {
1683 {Typ[Int], Typ[Int], true},
1684 {Typ[Int], nil, false},
1685 {nil, Typ[Int], false},
1688 if got := Identical(test.x, test.y); got != test.want {
1689 t.Errorf("Identical(%v, %v) = %t", test.x, test.y, got)
1694 func TestIdenticalUnions(t *testing.T) {
1695 tname := NewTypeName(nopos, nil, "myInt", nil)
1696 myInt := NewNamed(tname, Typ[Int], nil)
1697 tmap := map[string]*Term{
1698 "int": NewTerm(false, Typ[Int]),
1699 "~int": NewTerm(true, Typ[Int]),
1700 "string": NewTerm(false, Typ[String]),
1701 "~string": NewTerm(true, Typ[String]),
1702 "myInt": NewTerm(false, myInt),
1704 makeUnion := func(s string) *Union {
1705 parts := strings.Split(s, "|")
1707 for _, p := range parts {
1710 t.Fatalf("missing term %q", p)
1712 terms = append(terms, term)
1714 return NewUnion(terms)
1716 for _, test := range []struct {
1720 // These tests are just sanity checks. The tests for type sets and
1721 // interfaces provide much more test coverage.
1722 {"int|~int", "~int", true},
1723 {"myInt|~int", "~int", true},
1724 {"int|string", "string|int", true},
1725 {"int|int|string", "string|int", true},
1726 {"myInt|string", "int|string", false},
1728 x := makeUnion(test.x)
1729 y := makeUnion(test.y)
1730 if got := Identical(x, y); got != test.want {
1731 t.Errorf("Identical(%v, %v) = %t", test.x, test.y, got)
1736 func TestIssue15305(t *testing.T) {
1737 const src = "package p; func f() int16; var _ = f(undef)"
1738 f, err := parseSrc("issue15305.go", src)
1743 Error: func(err error) {}, // allow errors
1746 Types: make(map[syntax.Expr]TypeAndValue),
1748 conf.Check("p", []*syntax.File{f}, info) // ignore result
1749 for e, tv := range info.Types {
1750 if _, ok := e.(*syntax.CallExpr); ok {
1751 if tv.Type != Typ[Int16] {
1752 t.Errorf("CallExpr has type %v, want int16", tv.Type)
1757 t.Errorf("CallExpr has no type")
1760 // TestCompositeLitTypes verifies that Info.Types registers the correct
1761 // types for composite literal expressions and composite literal type
1763 func TestCompositeLitTypes(t *testing.T) {
1764 for _, test := range []struct {
1767 {`[16]byte{}`, `[16]byte`},
1768 {`[...]byte{}`, `[0]byte`}, // test for issue #14092
1769 {`[...]int{1, 2, 3}`, `[3]int`}, // test for issue #14092
1770 {`[...]int{90: 0, 98: 1, 2}`, `[100]int`}, // test for issue #14092
1771 {`[]int{}`, `[]int`},
1772 {`map[string]bool{"foo": true}`, `map[string]bool`},
1773 {`struct{}{}`, `struct{}`},
1774 {`struct{x, y int; z complex128}{}`, `struct{x int; y int; z complex128}`},
1776 f, err := parseSrc(test.lit, "package p; var _ = "+test.lit)
1778 t.Fatalf("%s: %v", test.lit, err)
1782 Types: make(map[syntax.Expr]TypeAndValue),
1784 if _, err = new(Config).Check("p", []*syntax.File{f}, info); err != nil {
1785 t.Fatalf("%s: %v", test.lit, err)
1788 cmptype := func(x syntax.Expr, want string) {
1789 tv, ok := info.Types[x]
1791 t.Errorf("%s: no Types entry found", test.lit)
1795 t.Errorf("%s: type is nil", test.lit)
1798 if got := tv.Type.String(); got != want {
1799 t.Errorf("%s: got %v, want %s", test.lit, got, want)
1803 // test type of composite literal expression
1804 rhs := f.DeclList[0].(*syntax.VarDecl).Values
1805 cmptype(rhs, test.typ)
1807 // test type of composite literal type expression
1808 cmptype(rhs.(*syntax.CompositeLit).Type, test.typ)
1812 // TestObjectParents verifies that objects have parent scopes or not
1813 // as specified by the Object interface.
1814 func TestObjectParents(t *testing.T) {
1833 func f(x int) { y := x; print(y) }
1836 f, err := parseSrc("src", src)
1842 Defs: make(map[*syntax.Name]Object),
1844 if _, err = new(Config).Check("p", []*syntax.File{f}, info); err != nil {
1848 for ident, obj := range info.Defs {
1850 // only package names and implicit vars have a nil object
1851 // (in this test we only need to handle the package name)
1852 if ident.Value != "p" {
1853 t.Errorf("%v has nil object", ident)
1858 // struct fields, type-associated and interface methods
1859 // have no parent scope
1861 switch obj := obj.(type) {
1867 if obj.Type().(*Signature).Recv() != nil { // method
1872 gotParent := obj.Parent() != nil
1874 case gotParent && !wantParent:
1875 t.Errorf("%v: want no parent, got %s", ident, obj.Parent())
1876 case !gotParent && wantParent:
1877 t.Errorf("%v: no parent found", ident)
1882 // TestFailedImport tests that we don't get follow-on errors
1883 // elsewhere in a package due to failing to import a package.
1884 func TestFailedImport(t *testing.T) {
1885 testenv.MustHaveGoBuild(t)
1890 import foo "go/types/thisdirectorymustnotexistotherwisethistestmayfail/foo" // should only see an error here
1895 func f(x T) T { return foo.F(x) }
1897 f, err := parseSrc("src", src)
1901 files := []*syntax.File{f}
1903 // type-check using all possible importers
1904 for _, compiler := range []string{"gc", "gccgo", "source"} {
1907 Error: func(err error) {
1908 // we should only see the import error
1909 if errcount > 0 || !strings.Contains(err.Error(), "could not import") {
1910 t.Errorf("for %s importer, got unexpected error: %v", compiler, err)
1914 //Importer: importer.For(compiler, nil),
1918 Uses: make(map[*syntax.Name]Object),
1920 pkg, _ := conf.Check("p", files, info)
1922 t.Errorf("for %s importer, type-checking failed to return a package", compiler)
1926 imports := pkg.Imports()
1927 if len(imports) != 1 {
1928 t.Errorf("for %s importer, got %d imports, want 1", compiler, len(imports))
1932 if imp.Name() != "foo" {
1933 t.Errorf(`for %s importer, got %q, want "foo"`, compiler, imp.Name())
1937 // verify that all uses of foo refer to the imported package foo (imp)
1938 for ident, obj := range info.Uses {
1939 if ident.Value == "foo" {
1940 if obj, ok := obj.(*PkgName); ok {
1941 if obj.Imported() != imp {
1942 t.Errorf("%s resolved to %v; want %v", ident.Value, obj.Imported(), imp)
1945 t.Errorf("%s resolved to %v; want package name", ident.Value, obj)
1952 func TestInstantiate(t *testing.T) {
1953 // eventually we like more tests but this is a start
1954 const src = "package p; type T[P any] *T[P]"
1955 pkg, err := pkgFor(".", src, nil)
1960 // type T should have one type parameter
1961 T := pkg.Scope().Lookup("T").Type().(*Named)
1962 if n := T.TypeParams().Len(); n != 1 {
1963 t.Fatalf("expected 1 type parameter; found %d", n)
1966 // instantiation should succeed (no endless recursion)
1967 // even with a nil *Checker
1968 res, err := Instantiate(nil, T, []Type{Typ[Int]}, false)
1973 // instantiated type should point to itself
1974 if p := res.Underlying().(*Pointer).Elem(); p != res {
1975 t.Fatalf("unexpected result type: %s points to %s", res, p)
1979 func TestInstantiateErrors(t *testing.T) {
1981 src string // by convention, T must be the type being instantiated
1983 wantAt int // -1 indicates no error
1985 {"type T[P interface{~string}] int", []Type{Typ[Int]}, 0},
1986 {"type T[P1 interface{int}, P2 interface{~string}] int", []Type{Typ[Int], Typ[Int]}, 1},
1987 {"type T[P1 any, P2 interface{~[]P1}] int", []Type{Typ[Int], NewSlice(Typ[String])}, 1},
1988 {"type T[P1 interface{~[]P2}, P2 any] int", []Type{NewSlice(Typ[String]), Typ[Int]}, 0},
1991 for _, test := range tests {
1992 src := "package p; " + test.src
1993 pkg, err := pkgFor(".", src, nil)
1998 T := pkg.Scope().Lookup("T").Type().(*Named)
2000 _, err = Instantiate(nil, T, test.targs, true)
2002 t.Fatalf("Instantiate(%v, %v) returned nil error, want non-nil", T, test.targs)
2005 gotAt := err.(ArgumentError).Index()
2006 if gotAt != test.wantAt {
2007 t.Errorf("Instantate(%v, %v): error at index %d, want index %d", T, test.targs, gotAt, test.wantAt)
2012 func TestInstanceIdentity(t *testing.T) {
2013 imports := make(testImporter)
2014 conf := Config{Importer: imports}
2015 makePkg := func(src string) {
2016 f, err := parseSrc("", src)
2020 name := f.PkgName.Value
2021 pkg, err := conf.Check(name, []*syntax.File{f}, nil)
2027 makePkg(`package lib; type T[P any] struct{}`)
2028 makePkg(`package a; import "lib"; var A lib.T[int]`)
2029 makePkg(`package b; import "lib"; var B lib.T[int]`)
2030 a := imports["a"].Scope().Lookup("A")
2031 b := imports["b"].Scope().Lookup("B")
2032 if !Identical(a.Type(), b.Type()) {
2033 t.Errorf("mismatching types: a.A: %s, b.B: %s", a.Type(), b.Type())