1 // Copyright 2013 The Go Authors. All rights reserved.
2 // Use of this source code is governed by a BSD-style
3 // license that can be found in the LICENSE file.
9 "cmd/compile/internal/syntax"
17 . "cmd/compile/internal/types2"
20 // genericPkg is a source prefix for packages that contain generic code.
21 const genericPkg = "package generic_"
23 // brokenPkg is a source prefix for packages that are not expected to parse
24 // or type-check cleanly. They are always parsed assuming that they contain
26 const brokenPkg = "package broken_"
28 func parseSrc(path, src string) (*syntax.File, error) {
30 if strings.HasPrefix(src, genericPkg) || strings.HasPrefix(src, brokenPkg) {
31 mode = syntax.AllowGenerics
33 errh := func(error) {} // dummy error handler so that parsing continues in presence of errors
34 return syntax.Parse(syntax.NewFileBase(path), strings.NewReader(src), errh, nil, mode)
37 func pkgFor(path, source string, info *Info) (*Package, error) {
38 f, err := parseSrc(path, source)
42 conf := Config{Importer: defaultImporter()}
43 return conf.Check(f.PkgName.Value, []*syntax.File{f}, info)
46 func mustTypecheck(t *testing.T, path, source string, info *Info) string {
47 pkg, err := pkgFor(path, source, info)
51 name = "package " + pkg.Name()
53 t.Fatalf("%s: didn't type-check (%s)", name, err)
58 func mayTypecheck(t *testing.T, path, source string, info *Info) (string, error) {
59 f, err := parseSrc(path, source)
60 if f == nil { // ignore errors unless f is nil
61 t.Fatalf("%s: unable to parse: %s", path, err)
64 Error: func(err error) {},
65 Importer: defaultImporter(),
67 pkg, err := conf.Check(f.PkgName.Value, []*syntax.File{f}, info)
68 return pkg.Name(), err
71 func TestValuesInfo(t *testing.T) {
72 var tests = []struct {
74 expr string // constant expression
75 typ string // constant type
76 val string // constant value
78 {`package a0; const _ = false`, `false`, `untyped bool`, `false`},
79 {`package a1; const _ = 0`, `0`, `untyped int`, `0`},
80 {`package a2; const _ = 'A'`, `'A'`, `untyped rune`, `65`},
81 {`package a3; const _ = 0.`, `0.`, `untyped float`, `0`},
82 {`package a4; const _ = 0i`, `0i`, `untyped complex`, `(0 + 0i)`},
83 {`package a5; const _ = "foo"`, `"foo"`, `untyped string`, `"foo"`},
85 {`package b0; var _ = false`, `false`, `bool`, `false`},
86 {`package b1; var _ = 0`, `0`, `int`, `0`},
87 {`package b2; var _ = 'A'`, `'A'`, `rune`, `65`},
88 {`package b3; var _ = 0.`, `0.`, `float64`, `0`},
89 {`package b4; var _ = 0i`, `0i`, `complex128`, `(0 + 0i)`},
90 {`package b5; var _ = "foo"`, `"foo"`, `string`, `"foo"`},
92 {`package c0a; var _ = bool(false)`, `false`, `bool`, `false`},
93 {`package c0b; var _ = bool(false)`, `bool(false)`, `bool`, `false`},
94 {`package c0c; type T bool; var _ = T(false)`, `T(false)`, `c0c.T`, `false`},
96 {`package c1a; var _ = int(0)`, `0`, `int`, `0`},
97 {`package c1b; var _ = int(0)`, `int(0)`, `int`, `0`},
98 {`package c1c; type T int; var _ = T(0)`, `T(0)`, `c1c.T`, `0`},
100 {`package c2a; var _ = rune('A')`, `'A'`, `rune`, `65`},
101 {`package c2b; var _ = rune('A')`, `rune('A')`, `rune`, `65`},
102 {`package c2c; type T rune; var _ = T('A')`, `T('A')`, `c2c.T`, `65`},
104 {`package c3a; var _ = float32(0.)`, `0.`, `float32`, `0`},
105 {`package c3b; var _ = float32(0.)`, `float32(0.)`, `float32`, `0`},
106 {`package c3c; type T float32; var _ = T(0.)`, `T(0.)`, `c3c.T`, `0`},
108 {`package c4a; var _ = complex64(0i)`, `0i`, `complex64`, `(0 + 0i)`},
109 {`package c4b; var _ = complex64(0i)`, `complex64(0i)`, `complex64`, `(0 + 0i)`},
110 {`package c4c; type T complex64; var _ = T(0i)`, `T(0i)`, `c4c.T`, `(0 + 0i)`},
112 {`package c5a; var _ = string("foo")`, `"foo"`, `string`, `"foo"`},
113 {`package c5b; var _ = string("foo")`, `string("foo")`, `string`, `"foo"`},
114 {`package c5c; type T string; var _ = T("foo")`, `T("foo")`, `c5c.T`, `"foo"`},
115 {`package c5d; var _ = string(65)`, `65`, `untyped int`, `65`},
116 {`package c5e; var _ = string('A')`, `'A'`, `untyped rune`, `65`},
117 {`package c5f; type T string; var _ = T('A')`, `'A'`, `untyped rune`, `65`},
118 {`package c5g; var s uint; var _ = string(1 << s)`, `1 << s`, `untyped int`, ``},
120 {`package d0; var _ = []byte("foo")`, `"foo"`, `string`, `"foo"`},
121 {`package d1; var _ = []byte(string("foo"))`, `"foo"`, `string`, `"foo"`},
122 {`package d2; var _ = []byte(string("foo"))`, `string("foo")`, `string`, `"foo"`},
123 {`package d3; type T []byte; var _ = T("foo")`, `"foo"`, `string`, `"foo"`},
125 {`package e0; const _ = float32( 1e-200)`, `float32(1e-200)`, `float32`, `0`},
126 {`package e1; const _ = float32(-1e-200)`, `float32(-1e-200)`, `float32`, `0`},
127 {`package e2; const _ = float64( 1e-2000)`, `float64(1e-2000)`, `float64`, `0`},
128 {`package e3; const _ = float64(-1e-2000)`, `float64(-1e-2000)`, `float64`, `0`},
129 {`package e4; const _ = complex64( 1e-200)`, `complex64(1e-200)`, `complex64`, `(0 + 0i)`},
130 {`package e5; const _ = complex64(-1e-200)`, `complex64(-1e-200)`, `complex64`, `(0 + 0i)`},
131 {`package e6; const _ = complex128( 1e-2000)`, `complex128(1e-2000)`, `complex128`, `(0 + 0i)`},
132 {`package e7; const _ = complex128(-1e-2000)`, `complex128(-1e-2000)`, `complex128`, `(0 + 0i)`},
134 {`package f0 ; var _ float32 = 1e-200`, `1e-200`, `float32`, `0`},
135 {`package f1 ; var _ float32 = -1e-200`, `-1e-200`, `float32`, `0`},
136 {`package f2a; var _ float64 = 1e-2000`, `1e-2000`, `float64`, `0`},
137 {`package f3a; var _ float64 = -1e-2000`, `-1e-2000`, `float64`, `0`},
138 {`package f2b; var _ = 1e-2000`, `1e-2000`, `float64`, `0`},
139 {`package f3b; var _ = -1e-2000`, `-1e-2000`, `float64`, `0`},
140 {`package f4 ; var _ complex64 = 1e-200 `, `1e-200`, `complex64`, `(0 + 0i)`},
141 {`package f5 ; var _ complex64 = -1e-200 `, `-1e-200`, `complex64`, `(0 + 0i)`},
142 {`package f6a; var _ complex128 = 1e-2000i`, `1e-2000i`, `complex128`, `(0 + 0i)`},
143 {`package f7a; var _ complex128 = -1e-2000i`, `-1e-2000i`, `complex128`, `(0 + 0i)`},
144 {`package f6b; var _ = 1e-2000i`, `1e-2000i`, `complex128`, `(0 + 0i)`},
145 {`package f7b; var _ = -1e-2000i`, `-1e-2000i`, `complex128`, `(0 + 0i)`},
147 {`package g0; const (a = len([iota]int{}); b; c); const _ = c`, `c`, `int`, `2`}, // issue #22341
148 {`package g1; var(j int32; s int; n = 1.0<<s == j)`, `1.0`, `int32`, `1`}, // issue #48422
151 for _, test := range tests {
153 Types: make(map[syntax.Expr]TypeAndValue),
155 name := mustTypecheck(t, "ValuesInfo", test.src, &info)
157 // look for expression
159 for e := range info.Types {
160 if syntax.String(e) == test.expr {
166 t.Errorf("package %s: no expression found for %s", name, test.expr)
169 tv := info.Types[expr]
171 // check that type is correct
172 if got := tv.Type.String(); got != test.typ {
173 t.Errorf("package %s: got type %s; want %s", name, got, test.typ)
177 // if we have a constant, check that value is correct
179 if got := tv.Value.ExactString(); got != test.val {
180 t.Errorf("package %s: got value %s; want %s", name, got, test.val)
184 t.Errorf("package %s: no constant found; want %s", name, test.val)
190 func TestTypesInfo(t *testing.T) {
191 var tests = []struct {
193 expr string // expression
194 typ string // value type
196 // single-valued expressions of untyped constants
197 {`package b0; var x interface{} = false`, `false`, `bool`},
198 {`package b1; var x interface{} = 0`, `0`, `int`},
199 {`package b2; var x interface{} = 0.`, `0.`, `float64`},
200 {`package b3; var x interface{} = 0i`, `0i`, `complex128`},
201 {`package b4; var x interface{} = "foo"`, `"foo"`, `string`},
204 {`package n0; var _ *int = nil`, `nil`, `*int`},
205 {`package n1; var _ func() = nil`, `nil`, `func()`},
206 {`package n2; var _ []byte = nil`, `nil`, `[]byte`},
207 {`package n3; var _ map[int]int = nil`, `nil`, `map[int]int`},
208 {`package n4; var _ chan int = nil`, `nil`, `chan int`},
209 {`package n5a; var _ interface{} = (*int)(nil)`, `nil`, `*int`},
210 {`package n5b; var _ interface{m()} = nil`, `nil`, `interface{m()}`},
211 {`package n6; import "unsafe"; var _ unsafe.Pointer = nil`, `nil`, `unsafe.Pointer`},
213 {`package n10; var (x *int; _ = x == nil)`, `nil`, `*int`},
214 {`package n11; var (x func(); _ = x == nil)`, `nil`, `func()`},
215 {`package n12; var (x []byte; _ = x == nil)`, `nil`, `[]byte`},
216 {`package n13; var (x map[int]int; _ = x == nil)`, `nil`, `map[int]int`},
217 {`package n14; var (x chan int; _ = x == nil)`, `nil`, `chan int`},
218 {`package n15a; var (x interface{}; _ = x == (*int)(nil))`, `nil`, `*int`},
219 {`package n15b; var (x interface{m()}; _ = x == nil)`, `nil`, `interface{m()}`},
220 {`package n15; import "unsafe"; var (x unsafe.Pointer; _ = x == nil)`, `nil`, `unsafe.Pointer`},
222 {`package n20; var _ = (*int)(nil)`, `nil`, `*int`},
223 {`package n21; var _ = (func())(nil)`, `nil`, `func()`},
224 {`package n22; var _ = ([]byte)(nil)`, `nil`, `[]byte`},
225 {`package n23; var _ = (map[int]int)(nil)`, `nil`, `map[int]int`},
226 {`package n24; var _ = (chan int)(nil)`, `nil`, `chan int`},
227 {`package n25a; var _ = (interface{})((*int)(nil))`, `nil`, `*int`},
228 {`package n25b; var _ = (interface{m()})(nil)`, `nil`, `interface{m()}`},
229 {`package n26; import "unsafe"; var _ = unsafe.Pointer(nil)`, `nil`, `unsafe.Pointer`},
231 {`package n30; func f(*int) { f(nil) }`, `nil`, `*int`},
232 {`package n31; func f(func()) { f(nil) }`, `nil`, `func()`},
233 {`package n32; func f([]byte) { f(nil) }`, `nil`, `[]byte`},
234 {`package n33; func f(map[int]int) { f(nil) }`, `nil`, `map[int]int`},
235 {`package n34; func f(chan int) { f(nil) }`, `nil`, `chan int`},
236 {`package n35a; func f(interface{}) { f((*int)(nil)) }`, `nil`, `*int`},
237 {`package n35b; func f(interface{m()}) { f(nil) }`, `nil`, `interface{m()}`},
238 {`package n35; import "unsafe"; func f(unsafe.Pointer) { f(nil) }`, `nil`, `unsafe.Pointer`},
240 // comma-ok expressions
241 {`package p0; var x interface{}; var _, _ = x.(int)`,
245 {`package p1; var x interface{}; func _() { _, _ = x.(int) }`,
249 {`package p2a; type mybool bool; var m map[string]complex128; var b mybool; func _() { _, b = m["foo"] }`,
251 `(complex128, p2a.mybool)`,
253 {`package p2b; var m map[string]complex128; var b bool; func _() { _, b = m["foo"] }`,
255 `(complex128, bool)`,
257 {`package p3; var c chan string; var _, _ = <-c`,
263 {`package issue6796_a; var x interface{}; var _, _ = (x.(int))`,
267 {`package issue6796_b; var c chan string; var _, _ = (<-c)`,
271 {`package issue6796_c; var c chan string; var _, _ = (<-c)`,
275 {`package issue6796_d; var c chan string; var _, _ = ((<-c))`,
279 {`package issue6796_e; func f(c chan string) { _, _ = ((<-c)) }`,
285 {`package issue7060_a; var ( m map[int]string; x, ok = m[0] )`,
289 {`package issue7060_b; var ( m map[int]string; x, ok interface{} = m[0] )`,
293 {`package issue7060_c; func f(x interface{}, ok bool, m map[int]string) { x, ok = m[0] }`,
297 {`package issue7060_d; var ( ch chan string; x, ok = <-ch )`,
301 {`package issue7060_e; var ( ch chan string; x, ok interface{} = <-ch )`,
305 {`package issue7060_f; func f(x interface{}, ok bool, ch chan string) { x, ok = <-ch }`,
311 {`package issue28277_a; func f(...int)`,
315 {`package issue28277_b; func f(a, b int, c ...[]struct{})`,
320 // tests for broken code that doesn't parse or type-check
321 {brokenPkg + `x0; func _() { var x struct {f string}; x.f := 0 }`, `x.f`, `string`},
322 {brokenPkg + `x1; func _() { var z string; type x struct {f string}; y := &x{q: z}}`, `z`, `string`},
323 {brokenPkg + `x2; func _() { var a, b string; type x struct {f string}; z := &x{f: a, f: b,}}`, `b`, `string`},
324 {brokenPkg + `x3; var x = panic("");`, `panic`, `func(interface{})`},
325 {`package x4; func _() { panic("") }`, `panic`, `func(interface{})`},
326 {brokenPkg + `x5; func _() { var x map[string][...]int; x = map[string][...]int{"": {1,2,3}} }`, `x`, `map[string]invalid type`},
328 // parameterized functions
329 {genericPkg + `p0; func f[T any](T) {}; var _ = f[int]`, `f`, `func[generic_p0.T₁ interface{}](generic_p0.T₁)`},
330 {genericPkg + `p1; func f[T any](T) {}; var _ = f[int]`, `f[int]`, `func(int)`},
331 {genericPkg + `p2; func f[T any](T) {}; func _() { f(42) }`, `f`, `func(int)`},
332 {genericPkg + `p3; func f[T any](T) {}; func _() { f[int](42) }`, `f[int]`, `func(int)`},
333 {genericPkg + `p4; func f[T any](T) {}; func _() { f[int](42) }`, `f`, `func[generic_p4.T₁ interface{}](generic_p4.T₁)`},
334 {genericPkg + `p5; func f[T any](T) {}; func _() { f(42) }`, `f(42)`, `()`},
337 {genericPkg + `t0; type t[] int; var _ t`, `t`, `generic_t0.t`}, // t[] is a syntax error that is ignored in this test in favor of t
338 {genericPkg + `t1; type t[P any] int; var _ t[int]`, `t`, `generic_t1.t[generic_t1.P₁ interface{}]`},
339 {genericPkg + `t2; type t[P interface{}] int; var _ t[int]`, `t`, `generic_t2.t[generic_t2.P₁ interface{}]`},
340 {genericPkg + `t3; type t[P, Q interface{}] int; var _ t[int, int]`, `t`, `generic_t3.t[generic_t3.P₁, generic_t3.Q₂ interface{}]`},
341 {brokenPkg + `t4; type t[P, Q interface{ m() }] int; var _ t[int, int]`, `t`, `broken_t4.t[broken_t4.P₁, broken_t4.Q₂ interface{m()}]`},
343 // instantiated types must be sanitized
344 {genericPkg + `g0; type t[P any] int; var x struct{ f t[int] }; var _ = x.f`, `x.f`, `generic_g0.t[int]`},
347 {genericPkg + `issue45096; func _[T interface{ ~int8 | ~int16 | ~int32 }](x T) { _ = x < 0 }`, `0`, `generic_issue45096.T₁`},
350 {`package p; import "unsafe"; type S struct { f int }; var s S; var _ = unsafe.Offsetof(s.f)`, `s.f`, `int`},
353 for _, test := range tests {
354 info := Info{Types: make(map[syntax.Expr]TypeAndValue)}
356 if strings.HasPrefix(test.src, brokenPkg) {
358 name, err = mayTypecheck(t, "TypesInfo", test.src, &info)
360 t.Errorf("package %s: expected to fail but passed", name)
364 name = mustTypecheck(t, "TypesInfo", test.src, &info)
367 // look for expression type
369 for e, tv := range info.Types {
370 if syntax.String(e) == test.expr {
376 t.Errorf("package %s: no type found for %s", name, test.expr)
380 // check that type is correct
381 if got := typ.String(); got != test.typ {
382 t.Errorf("package %s: got %s; want %s", name, got, test.typ)
387 func TestInstanceInfo(t *testing.T) {
388 var tests = []struct {
394 {genericPkg + `p0; func f[T any](T) {}; func _() { f(42) }`,
399 {genericPkg + `p1; func f[T any](T) T { panic(0) }; func _() { f('@') }`,
404 {genericPkg + `p2; func f[T any](...T) T { panic(0) }; func _() { f(0i) }`,
406 []string{`complex128`},
407 `func(...complex128) complex128`,
409 {genericPkg + `p3; func f[A, B, C any](A, *B, []C) {}; func _() { f(1.2, new(string), []byte{}) }`,
411 []string{`float64`, `string`, `byte`},
412 `func(float64, *string, []byte)`,
414 {genericPkg + `p4; func f[A, B any](A, *B, ...[]B) {}; func _() { f(1.2, new(byte)) }`,
416 []string{`float64`, `byte`},
417 `func(float64, *byte, ...[]byte)`,
420 // we don't know how to translate these but we can type-check them
421 {genericPkg + `q0; type T struct{}; func (T) m[P any](P) {}; func _(x T) { x.m(42) }`,
426 {genericPkg + `q1; type T struct{}; func (T) m[P any](P) P { panic(0) }; func _(x T) { x.m(42) }`,
431 {genericPkg + `q2; type T struct{}; func (T) m[P any](...P) P { panic(0) }; func _(x T) { x.m(42) }`,
436 {genericPkg + `q3; type T struct{}; func (T) m[A, B, C any](A, *B, []C) {}; func _(x T) { x.m(1.2, new(string), []byte{}) }`,
438 []string{`float64`, `string`, `byte`},
439 `func(float64, *string, []byte)`,
441 {genericPkg + `q4; type T struct{}; func (T) m[A, B any](A, *B, ...[]B) {}; func _(x T) { x.m(1.2, new(byte)) }`,
443 []string{`float64`, `byte`},
444 `func(float64, *byte, ...[]byte)`,
447 {genericPkg + `r0; type T[P any] struct{}; func (_ T[P]) m[Q any](Q) {}; func _[P any](x T[P]) { x.m(42) }`,
452 // TODO(gri) record method type parameters in syntax.FuncType so we can check this
453 // {genericPkg + `r1; type T interface{ m[P any](P) }; func _(x T) { x.m(4.2) }`,
455 // []string{`float64`},
459 {genericPkg + `s1; func f[T any, P interface{~*T}](x T) {}; func _(x string) { f(x) }`,
461 []string{`string`, `*string`},
464 {genericPkg + `s2; func f[T any, P interface{~*T}](x []T) {}; func _(x []int) { f(x) }`,
466 []string{`int`, `*int`},
469 {genericPkg + `s3; type C[T any] interface{~chan<- T}; func f[T any, P C[T]](x []T) {}; func _(x []int) { f(x) }`,
471 []string{`int`, `chan<- int`},
474 {genericPkg + `s4; type C[T any] interface{~chan<- T}; func f[T any, P C[T], Q C[[]*P]](x []T) {}; func _(x []int) { f(x) }`,
476 []string{`int`, `chan<- int`, `chan<- []*chan<- int`},
480 {genericPkg + `t1; func f[T any, P interface{~*T}]() T { panic(0) }; func _() { _ = f[string] }`,
482 []string{`string`, `*string`},
485 {genericPkg + `t2; func f[T any, P interface{~*T}]() T { panic(0) }; func _() { _ = (f[string]) }`,
487 []string{`string`, `*string`},
490 {genericPkg + `t3; type C[T any] interface{~chan<- T}; func f[T any, P C[T], Q C[[]*P]]() []T { return nil }; func _() { _ = f[int] }`,
492 []string{`int`, `chan<- int`, `chan<- []*chan<- int`},
495 {genericPkg + `t4; type C[T any] interface{~chan<- T}; func f[T any, P C[T], Q C[[]*P]]() []T { return nil }; func _() { _ = f[int] }`,
497 []string{`int`, `chan<- int`, `chan<- []*chan<- int`},
500 {genericPkg + `i0; import lib "generic_lib"; func _() { lib.F(42) }`,
505 {genericPkg + `type0; type T[P interface{~int}] struct{ x P }; var _ T[int]`,
510 {genericPkg + `type1; type T[P interface{~int}] struct{ x P }; var _ (T[int])`,
515 {genericPkg + `type2; type T[P interface{~int}] struct{ x P }; var _ T[(int)]`,
520 {genericPkg + `type3; type T[P1 interface{~[]P2}, P2 any] struct{ x P1; y P2 }; var _ T[[]int, int]`,
522 []string{`[]int`, `int`},
523 `struct{x []int; y int}`,
525 {genericPkg + `type4; import lib "generic_lib"; var _ lib.T[int]`,
532 for _, test := range tests {
533 const lib = `package generic_lib
540 imports := make(testImporter)
541 conf := Config{Importer: imports}
542 instances := make(map[*syntax.Name]Instance)
543 uses := make(map[*syntax.Name]Object)
544 makePkg := func(src string) *Package {
545 f, err := parseSrc("p.go", src)
549 pkg, err := conf.Check("", []*syntax.File{f}, &Info{Instances: instances, Uses: uses})
553 imports[pkg.Name()] = pkg
557 pkg := makePkg(test.src)
559 // look for instance information
562 for ident, inst := range instances {
563 if syntax.String(ident) == test.name {
564 for i := 0; i < inst.TypeArgs.Len(); i++ {
565 targs = append(targs, inst.TypeArgs.At(i))
569 // Check that we can find the corresponding parameterized type.
570 ptype := uses[ident].Type()
571 lister, _ := ptype.(interface{ TypeParams() *TypeParamList })
572 if lister == nil || lister.TypeParams().Len() == 0 {
573 t.Errorf("package %s: info.Types[%v] = %v, want parameterized type", pkg.Name(), ident, ptype)
577 // Verify the invariant that re-instantiating the generic type with
578 // TypeArgs results in an equivalent type.
579 inst2, err := Instantiate(nil, ptype, targs, true)
581 t.Errorf("Instantiate(%v, %v) failed: %v", ptype, targs, err)
583 if !Identical(inst.Type, inst2) {
584 t.Errorf("%v and %v are not identical", inst.Type, inst2)
590 t.Errorf("package %s: no instance information found for %s", pkg.Name(), test.name)
594 // check that type arguments are correct
595 if len(targs) != len(test.targs) {
596 t.Errorf("package %s: got %d type arguments; want %d", pkg.Name(), len(targs), len(test.targs))
599 for i, targ := range targs {
600 if got := targ.String(); got != test.targs[i] {
601 t.Errorf("package %s, %d. type argument: got %s; want %s", pkg.Name(), i, got, test.targs[i])
606 // check that the types match
607 if got := typ.Underlying().String(); got != test.typ {
608 t.Errorf("package %s: got %s; want %s", pkg.Name(), got, test.typ)
613 func TestDefsInfo(t *testing.T) {
614 var tests = []struct {
619 {`package p0; const x = 42`, `x`, `const p0.x untyped int`},
620 {`package p1; const x int = 42`, `x`, `const p1.x int`},
621 {`package p2; var x int`, `x`, `var p2.x int`},
622 {`package p3; type x int`, `x`, `type p3.x int`},
623 {`package p4; func f()`, `f`, `func p4.f()`},
624 {`package p5; func f() int { x, _ := 1, 2; return x }`, `_`, `var _ int`},
627 for _, test := range tests {
629 Defs: make(map[*syntax.Name]Object),
631 name := mustTypecheck(t, "DefsInfo", test.src, &info)
635 for id, obj := range info.Defs {
636 if id.Value == test.obj {
642 t.Errorf("package %s: %s not found", name, test.obj)
646 if got := def.String(); got != test.want {
647 t.Errorf("package %s: got %s; want %s", name, got, test.want)
652 func TestUsesInfo(t *testing.T) {
653 var tests = []struct {
658 {`package p0; func _() { _ = x }; const x = 42`, `x`, `const p0.x untyped int`},
659 {`package p1; func _() { _ = x }; const x int = 42`, `x`, `const p1.x int`},
660 {`package p2; func _() { _ = x }; var x int`, `x`, `var p2.x int`},
661 {`package p3; func _() { type _ x }; type x int`, `x`, `type p3.x int`},
662 {`package p4; func _() { _ = f }; func f()`, `f`, `func p4.f()`},
665 for _, test := range tests {
667 Uses: make(map[*syntax.Name]Object),
669 name := mustTypecheck(t, "UsesInfo", test.src, &info)
673 for id, obj := range info.Uses {
674 if id.Value == test.obj {
680 t.Errorf("package %s: %s not found", name, test.obj)
684 if got := use.String(); got != test.want {
685 t.Errorf("package %s: got %s; want %s", name, got, test.want)
690 func TestImplicitsInfo(t *testing.T) {
691 testenv.MustHaveGoBuild(t)
693 var tests = []struct {
697 {`package p2; import . "fmt"; var _ = Println`, ""}, // no Implicits entry
698 {`package p0; import local "fmt"; var _ = local.Println`, ""}, // no Implicits entry
699 {`package p1; import "fmt"; var _ = fmt.Println`, "importSpec: package fmt"},
701 {`package p3; func f(x interface{}) { switch x.(type) { case int: } }`, ""}, // no Implicits entry
702 {`package p4; func f(x interface{}) { switch t := x.(type) { case int: _ = t } }`, "caseClause: var t int"},
703 {`package p5; func f(x interface{}) { switch t := x.(type) { case int, uint: _ = t } }`, "caseClause: var t interface{}"},
704 {`package p6; func f(x interface{}) { switch t := x.(type) { default: _ = t } }`, "caseClause: var t interface{}"},
706 {`package p7; func f(x int) {}`, ""}, // no Implicits entry
707 {`package p8; func f(int) {}`, "field: var int"},
708 {`package p9; func f() (complex64) { return 0 }`, "field: var complex64"},
709 {`package p10; type T struct{}; func (*T) f() {}`, "field: var *p10.T"},
712 for _, test := range tests {
714 Implicits: make(map[syntax.Node]Object),
716 name := mustTypecheck(t, "ImplicitsInfo", test.src, &info)
718 // the test cases expect at most one Implicits entry
719 if len(info.Implicits) > 1 {
720 t.Errorf("package %s: %d Implicits entries found", name, len(info.Implicits))
724 // extract Implicits entry, if any
726 for n, obj := range info.Implicits {
727 switch x := n.(type) {
728 case *syntax.ImportDecl:
730 case *syntax.CaseClause:
735 t.Fatalf("package %s: unexpected %T", name, x)
737 got += ": " + obj.String()
741 if got != test.want {
742 t.Errorf("package %s: got %q; want %q", name, got, test.want)
747 func predString(tv TypeAndValue) string {
749 pred := func(b bool, s string) {
752 buf.WriteString(", ")
758 pred(tv.IsVoid(), "void")
759 pred(tv.IsType(), "type")
760 pred(tv.IsBuiltin(), "builtin")
761 pred(tv.IsValue() && tv.Value != nil, "const")
762 pred(tv.IsValue() && tv.Value == nil, "value")
763 pred(tv.IsNil(), "nil")
764 pred(tv.Addressable(), "addressable")
765 pred(tv.Assignable(), "assignable")
766 pred(tv.HasOk(), "hasOk")
774 func TestPredicatesInfo(t *testing.T) {
775 testenv.MustHaveGoBuild(t)
777 var tests = []struct {
783 {`package n0; func f() { f() }`, `f()`, `void`},
786 {`package t0; type _ int`, `int`, `type`},
787 {`package t1; type _ []int`, `[]int`, `type`},
788 {`package t2; type _ func()`, `func()`, `type`},
789 {`package t3; type _ func(int)`, `int`, `type`},
790 {`package t3; type _ func(...int)`, `...int`, `type`},
793 {`package b0; var _ = len("")`, `len`, `builtin`},
794 {`package b1; var _ = (len)("")`, `(len)`, `builtin`},
797 {`package c0; var _ = 42`, `42`, `const`},
798 {`package c1; var _ = "foo" + "bar"`, `"foo" + "bar"`, `const`},
799 {`package c2; const (i = 1i; _ = i)`, `i`, `const`},
802 {`package v0; var (a, b int; _ = a + b)`, `a + b`, `value`},
803 {`package v1; var _ = &[]int{1}`, `[]int{…}`, `value`},
804 {`package v2; var _ = func(){}`, `func() {}`, `value`},
805 {`package v4; func f() { _ = f }`, `f`, `value`},
806 {`package v3; var _ *int = nil`, `nil`, `value, nil`},
807 {`package v3; var _ *int = (nil)`, `(nil)`, `value, nil`},
809 // addressable (and thus assignable) operands
810 {`package a0; var (x int; _ = x)`, `x`, `value, addressable, assignable`},
811 {`package a1; var (p *int; _ = *p)`, `*p`, `value, addressable, assignable`},
812 {`package a2; var (s []int; _ = s[0])`, `s[0]`, `value, addressable, assignable`},
813 {`package a3; var (s struct{f int}; _ = s.f)`, `s.f`, `value, addressable, assignable`},
814 {`package a4; var (a [10]int; _ = a[0])`, `a[0]`, `value, addressable, assignable`},
815 {`package a5; func _(x int) { _ = x }`, `x`, `value, addressable, assignable`},
816 {`package a6; func _()(x int) { _ = x; return }`, `x`, `value, addressable, assignable`},
817 {`package a7; type T int; func (x T) _() { _ = x }`, `x`, `value, addressable, assignable`},
818 // composite literals are not addressable
820 // assignable but not addressable values
821 {`package s0; var (m map[int]int; _ = m[0])`, `m[0]`, `value, assignable, hasOk`},
822 {`package s1; var (m map[int]int; _, _ = m[0])`, `m[0]`, `value, assignable, hasOk`},
825 {`package k0; var (ch chan int; _ = <-ch)`, `<-ch`, `value, hasOk`},
826 {`package k1; var (ch chan int; _, _ = <-ch)`, `<-ch`, `value, hasOk`},
829 // - package names are collected in the Uses map
830 // - identifiers being declared are collected in the Defs map
831 {`package m0; import "os"; func _() { _ = os.Stdout }`, `os`, `<missing>`},
832 {`package m1; import p "os"; func _() { _ = p.Stdout }`, `p`, `<missing>`},
833 {`package m2; const c = 0`, `c`, `<missing>`},
834 {`package m3; type T int`, `T`, `<missing>`},
835 {`package m4; var v int`, `v`, `<missing>`},
836 {`package m5; func f() {}`, `f`, `<missing>`},
837 {`package m6; func _(x int) {}`, `x`, `<missing>`},
838 {`package m6; func _()(x int) { return }`, `x`, `<missing>`},
839 {`package m6; type T int; func (x T) _() {}`, `x`, `<missing>`},
842 for _, test := range tests {
843 info := Info{Types: make(map[syntax.Expr]TypeAndValue)}
844 name := mustTypecheck(t, "PredicatesInfo", test.src, &info)
846 // look for expression predicates
848 for e, tv := range info.Types {
849 //println(name, syntax.String(e))
850 if syntax.String(e) == test.expr {
856 if got != test.pred {
857 t.Errorf("package %s: got %s; want %s", name, got, test.pred)
862 func TestScopesInfo(t *testing.T) {
863 testenv.MustHaveGoBuild(t)
865 var tests = []struct {
867 scopes []string // list of scope descriptors of the form kind:varlist
869 {`package p0`, []string{
872 {`package p1; import ( "fmt"; m "math"; _ "os" ); var ( _ = fmt.Println; _ = m.Pi )`, []string{
875 {`package p2; func _() {}`, []string{
878 {`package p3; func _(x, y int) {}`, []string{
881 {`package p4; func _(x, y int) { x, z := 1, 2; _ = z }`, []string{
882 "file:", "func:x y z", // redeclaration of x
884 {`package p5; func _(x, y int) (u, _ int) { return }`, []string{
885 "file:", "func:u x y",
887 {`package p6; func _() { { var x int; _ = x } }`, []string{
888 "file:", "func:", "block:x",
890 {`package p7; func _() { if true {} }`, []string{
891 "file:", "func:", "if:", "block:",
893 {`package p8; func _() { if x := 0; x < 0 { y := x; _ = y } }`, []string{
894 "file:", "func:", "if:x", "block:y",
896 {`package p9; func _() { switch x := 0; x {} }`, []string{
897 "file:", "func:", "switch:x",
899 {`package p10; func _() { switch x := 0; x { case 1: y := x; _ = y; default: }}`, []string{
900 "file:", "func:", "switch:x", "case:y", "case:",
902 {`package p11; func _(t interface{}) { switch t.(type) {} }`, []string{
903 "file:", "func:t", "switch:",
905 {`package p12; func _(t interface{}) { switch t := t; t.(type) {} }`, []string{
906 "file:", "func:t", "switch:t",
908 {`package p13; func _(t interface{}) { switch x := t.(type) { case int: _ = x } }`, []string{
909 "file:", "func:t", "switch:", "case:x", // x implicitly declared
911 {`package p14; func _() { select{} }`, []string{
914 {`package p15; func _(c chan int) { select{ case <-c: } }`, []string{
915 "file:", "func:c", "comm:",
917 {`package p16; func _(c chan int) { select{ case i := <-c: x := i; _ = x} }`, []string{
918 "file:", "func:c", "comm:i x",
920 {`package p17; func _() { for{} }`, []string{
921 "file:", "func:", "for:", "block:",
923 {`package p18; func _(n int) { for i := 0; i < n; i++ { _ = i } }`, []string{
924 "file:", "func:n", "for:i", "block:",
926 {`package p19; func _(a []int) { for i := range a { _ = i} }`, []string{
927 "file:", "func:a", "for:i", "block:",
929 {`package p20; var s int; func _(a []int) { for i, x := range a { s += x; _ = i } }`, []string{
930 "file:", "func:a", "for:i x", "block:",
934 for _, test := range tests {
935 info := Info{Scopes: make(map[syntax.Node]*Scope)}
936 name := mustTypecheck(t, "ScopesInfo", test.src, &info)
938 // number of scopes must match
939 if len(info.Scopes) != len(test.scopes) {
940 t.Errorf("package %s: got %d scopes; want %d", name, len(info.Scopes), len(test.scopes))
943 // scope descriptions must match
944 for node, scope := range info.Scopes {
949 case *syntax.FuncType:
951 case *syntax.BlockStmt:
955 case *syntax.SwitchStmt:
957 case *syntax.SelectStmt:
959 case *syntax.CaseClause:
961 case *syntax.CommClause:
963 case *syntax.ForStmt:
966 kind = fmt.Sprintf("%T", node)
969 // look for matching scope description
970 desc := kind + ":" + strings.Join(scope.Names(), " ")
972 for _, d := range test.scopes {
979 t.Errorf("package %s: no matching scope found for %s", name, desc)
985 func TestInitOrderInfo(t *testing.T) {
986 var tests = []struct {
990 {`package p0; var (x = 1; y = x)`, []string{
993 {`package p1; var (a = 1; b = 2; c = 3)`, []string{
994 "a = 1", "b = 2", "c = 3",
996 {`package p2; var (a, b, c = 1, 2, 3)`, []string{
997 "a = 1", "b = 2", "c = 3",
999 {`package p3; var _ = f(); func f() int { return 1 }`, []string{
1000 "_ = f()", // blank var
1002 {`package p4; var (a = 0; x = y; y = z; z = 0)`, []string{
1003 "a = 0", "z = 0", "y = z", "x = y",
1005 {`package p5; var (a, _ = m[0]; m map[int]string)`, []string{
1006 "a, _ = m[0]", // blank var
1008 {`package p6; var a, b = f(); func f() (_, _ int) { return z, z }; var z = 0`, []string{
1009 "z = 0", "a, b = f()",
1011 {`package p7; var (a = func() int { return b }(); b = 1)`, []string{
1012 "b = 1", "a = func() int {…}()",
1014 {`package p8; var (a, b = func() (_, _ int) { return c, c }(); c = 1)`, []string{
1015 "c = 1", "a, b = func() (_, _ int) {…}()",
1017 {`package p9; type T struct{}; func (T) m() int { _ = y; return 0 }; var x, y = T.m, 1`, []string{
1020 {`package p10; var (d = c + b; a = 0; b = 0; c = 0)`, []string{
1021 "a = 0", "b = 0", "c = 0", "d = c + b",
1023 {`package p11; var (a = e + c; b = d + c; c = 0; d = 0; e = 0)`, []string{
1024 "c = 0", "d = 0", "b = d + c", "e = 0", "a = e + c",
1026 // emit an initializer for n:1 initializations only once (not for each node
1027 // on the lhs which may appear in different order in the dependency graph)
1028 {`package p12; var (a = x; b = 0; x, y = m[0]; m map[int]int)`, []string{
1029 "b = 0", "x, y = m[0]", "a = x",
1031 // test case from spec section on package initialization
1045 "d = 3", "b = f()", "c = f()", "a = c + b",
1047 // test case for issue 7131
1051 func next() int { counter++; return counter }
1054 func makeOrder() []int { return []int{f, b, d, e, c, a} }
1057 var b, c = next(), next()
1058 var d, e, f = next(), next(), next()
1060 "a = next()", "b = next()", "c = next()", "d = next()", "e = next()", "f = next()", "_ = makeOrder()",
1062 // test case for issue 10709
1072 func (T) m() int { return 0 }
1074 func makeT(n int) T {
1080 "t = makeT(0)", "v = t.m()",
1082 // test case for issue 10709: same as test before, but variable decls swapped
1092 func (T) m() int { return 0 }
1094 func makeT(n int) T {
1100 "t = makeT(0)", "v = t.m()",
1102 // another candidate possibly causing problems with issue 10709
1107 func f1() int { return g1() }
1108 func g1() int { f1(); return x1 }
1114 func f2() int { return g2() }
1115 func g2() int { return x2 }
1117 var x2 = 0`, []string{
1118 "x1 = 0", "y1 = f1()", "x2 = 0", "y2 = f2()",
1122 for _, test := range tests {
1124 name := mustTypecheck(t, "InitOrderInfo", test.src, &info)
1126 // number of initializers must match
1127 if len(info.InitOrder) != len(test.inits) {
1128 t.Errorf("package %s: got %d initializers; want %d", name, len(info.InitOrder), len(test.inits))
1132 // initializers must match
1133 for i, want := range test.inits {
1134 got := info.InitOrder[i].String()
1136 t.Errorf("package %s, init %d: got %s; want %s", name, i, got, want)
1143 func TestMultiFileInitOrder(t *testing.T) {
1144 mustParse := func(src string) *syntax.File {
1145 f, err := parseSrc("main", src)
1152 fileA := mustParse(`package main; var a = 1`)
1153 fileB := mustParse(`package main; var b = 2`)
1155 // The initialization order must not depend on the parse
1156 // order of the files, only on the presentation order to
1157 // the type-checker.
1158 for _, test := range []struct {
1159 files []*syntax.File
1162 {[]*syntax.File{fileA, fileB}, "[a = 1 b = 2]"},
1163 {[]*syntax.File{fileB, fileA}, "[b = 2 a = 1]"},
1166 if _, err := new(Config).Check("main", test.files, &info); err != nil {
1169 if got := fmt.Sprint(info.InitOrder); got != test.want {
1170 t.Fatalf("got %s; want %s", got, test.want)
1175 func TestFiles(t *testing.T) {
1176 var sources = []string{
1177 "package p; type T struct{}; func (T) m1() {}",
1178 "package p; func (T) m2() {}; var x interface{ m1(); m2() } = T{}",
1179 "package p; func (T) m3() {}; var y interface{ m1(); m2(); m3() } = T{}",
1184 pkg := NewPackage("p", "p")
1186 check := NewChecker(&conf, pkg, &info)
1188 for i, src := range sources {
1189 filename := fmt.Sprintf("sources%d", i)
1190 f, err := parseSrc(filename, src)
1194 if err := check.Files([]*syntax.File{f}); err != nil {
1199 // check InitOrder is [x y]
1201 for _, init := range info.InitOrder {
1202 for _, v := range init.Lhs {
1203 vars = append(vars, v.Name())
1206 if got, want := fmt.Sprint(vars), "[x y]"; got != want {
1207 t.Errorf("InitOrder == %s, want %s", got, want)
1211 type testImporter map[string]*Package
1213 func (m testImporter) Import(path string) (*Package, error) {
1214 if pkg := m[path]; pkg != nil {
1217 return nil, fmt.Errorf("package %q not found", path)
1220 func TestSelection(t *testing.T) {
1221 selections := make(map[*syntax.SelectorExpr]*Selection)
1223 imports := make(testImporter)
1224 conf := Config{Importer: imports}
1225 makePkg := func(path, src string) {
1226 f, err := parseSrc(path+".go", src)
1230 pkg, err := conf.Check(path, []*syntax.File{f}, &Info{Selections: selections})
1268 // qualified identifiers
1302 // method expressions
1309 wantOut := map[string][2]string{
1310 "lib.T.M": {"method expr (lib.T) M(lib.T)", ".[0]"},
1312 "A{}.B": {"field (main.A) B *main.B", ".[0]"},
1313 "new(A).B": {"field (*main.A) B *main.B", "->[0]"},
1314 "A{}.C": {"field (main.A) C main.C", ".[1]"},
1315 "new(A).C": {"field (*main.A) C main.C", "->[1]"},
1316 "A{}.b": {"field (main.A) b int", "->[0 0]"},
1317 "new(A).b": {"field (*main.A) b int", "->[0 0]"},
1318 "A{}.c": {"field (main.A) c int", ".[1 0]"},
1319 "new(A).c": {"field (*main.A) c int", "->[1 0]"},
1321 "A{}.f": {"method (main.A) f(int)", "->[0 0]"},
1322 "new(A).f": {"method (*main.A) f(int)", "->[0 0]"},
1323 "A{}.g": {"method (main.A) g()", ".[1 0]"},
1324 "new(A).g": {"method (*main.A) g()", "->[1 0]"},
1325 "new(A).h": {"method (*main.A) h()", "->[1 1]"}, // TODO(gri) should this report .[1 1] ?
1326 "B{}.f": {"method (main.B) f(int)", ".[0]"},
1327 "new(B).f": {"method (*main.B) f(int)", "->[0]"},
1328 "C{}.g": {"method (main.C) g()", ".[0]"},
1329 "new(C).g": {"method (*main.C) g()", "->[0]"},
1330 "new(C).h": {"method (*main.C) h()", "->[1]"}, // TODO(gri) should this report .[1] ?
1332 "A.f": {"method expr (main.A) f(main.A, int)", "->[0 0]"},
1333 "(*A).f": {"method expr (*main.A) f(*main.A, int)", "->[0 0]"},
1334 "B.f": {"method expr (main.B) f(main.B, int)", ".[0]"},
1335 "(*B).f": {"method expr (*main.B) f(*main.B, int)", "->[0]"},
1338 makePkg("lib", libSrc)
1339 makePkg("main", mainSrc)
1341 for e, sel := range selections {
1342 _ = sel.String() // assertion: must not panic
1344 start := indexFor(mainSrc, syntax.StartPos(e))
1345 end := indexFor(mainSrc, syntax.EndPos(e))
1346 segment := mainSrc[start:end] // (all SelectorExprs are in main, not lib)
1354 fmt.Sprintf("%s%v", direct, sel.Index()),
1356 want := wantOut[segment]
1358 t.Errorf("%s: got %q; want %q", segment, got, want)
1360 delete(wantOut, segment)
1362 // We must explicitly assert properties of the
1363 // Signature's receiver since it doesn't participate
1364 // in Identical() or String().
1365 sig, _ := sel.Type().(*Signature)
1366 if sel.Kind() == MethodVal {
1367 got := sig.Recv().Type()
1369 if !Identical(got, want) {
1370 t.Errorf("%s: Recv() = %s, want %s", segment, got, want)
1372 } else if sig != nil && sig.Recv() != nil {
1373 t.Errorf("%s: signature has receiver %s", sig, sig.Recv().Type())
1376 // Assert that all wantOut entries were used exactly once.
1377 for segment := range wantOut {
1378 t.Errorf("no syntax.Selection found with syntax %q", segment)
1382 // indexFor returns the index into s corresponding to the position pos.
1383 func indexFor(s string, pos syntax.Pos) int {
1384 i, line := 0, 1 // string index and corresponding line
1385 target := int(pos.Line())
1386 for line < target && i < len(s) {
1392 return i + int(pos.Col()-1) // columns are 1-based
1395 func TestIssue8518(t *testing.T) {
1396 imports := make(testImporter)
1398 Error: func(err error) { t.Log(err) }, // don't exit after first error
1401 makePkg := func(path, src string) {
1402 f, err := parseSrc(path, src)
1406 pkg, _ := conf.Check(path, []*syntax.File{f}, nil) // errors logged via conf.Error
1414 const C2 = missing.C
1424 makePkg("a", libSrc)
1425 makePkg("main", mainSrc) // don't crash when type-checking this package
1428 func TestLookupFieldOrMethod(t *testing.T) {
1429 // Test cases assume a lookup of the form a.f or x.f, where a stands for an
1430 // addressable value, and x for a non-addressable value (even though a variable
1431 // for ease of test case writing).
1432 var tests = []struct {
1439 {"var x T; type T struct{}", false, nil, false},
1440 {"var x T; type T struct{ f int }", true, []int{0}, false},
1441 {"var x T; type T struct{ a, b, f, c int }", true, []int{2}, false},
1444 {"var a T; type T struct{}; func (T) f() {}", true, []int{0}, false},
1445 {"var a *T; type T struct{}; func (T) f() {}", true, []int{0}, true},
1446 {"var a T; type T struct{}; func (*T) f() {}", true, []int{0}, false},
1447 {"var a *T; type T struct{}; func (*T) f() {}", true, []int{0}, true}, // TODO(gri) should this report indirect = false?
1450 {"type ( E1 struct{ f int }; E2 struct{ f int }; x struct{ E1; *E2 })", false, []int{1, 0}, false},
1451 {"type ( E1 struct{ f int }; E2 struct{}; x struct{ E1; *E2 }); func (E2) f() {}", false, []int{1, 0}, false},
1453 // outside methodset
1454 // (*T).f method exists, but value of type T is not addressable
1455 {"var x T; type T struct{}; func (*T) f() {}", false, nil, true},
1458 for _, test := range tests {
1459 pkg, err := pkgFor("test", "package p;"+test.src, nil)
1461 t.Errorf("%s: incorrect test case: %s", test.src, err)
1465 obj := pkg.Scope().Lookup("a")
1467 if obj = pkg.Scope().Lookup("x"); obj == nil {
1468 t.Errorf("%s: incorrect test case - no object a or x", test.src)
1473 f, index, indirect := LookupFieldOrMethod(obj.Type(), obj.Name() == "a", pkg, "f")
1474 if (f != nil) != test.found {
1476 t.Errorf("%s: got no object; want one", test.src)
1478 t.Errorf("%s: got object = %v; want none", test.src, f)
1481 if !sameSlice(index, test.index) {
1482 t.Errorf("%s: got index = %v; want %v", test.src, index, test.index)
1484 if indirect != test.indirect {
1485 t.Errorf("%s: got indirect = %v; want %v", test.src, indirect, test.indirect)
1490 func sameSlice(a, b []int) bool {
1491 if len(a) != len(b) {
1494 for i, x := range a {
1502 // TestScopeLookupParent ensures that (*Scope).LookupParent returns
1503 // the correct result at various positions within the source.
1504 func TestScopeLookupParent(t *testing.T) {
1505 imports := make(testImporter)
1506 conf := Config{Importer: imports}
1508 makePkg := func(path, src string) {
1509 f, err := parseSrc(path, src)
1513 imports[path], err = conf.Check(path, []*syntax.File{f}, &info)
1519 makePkg("lib", "package lib; var X int")
1520 // Each /*name=kind:line*/ comment makes the test look up the
1521 // name at that point and checks that it resolves to a decl of
1522 // the specified kind and line number. "undef" means undefined.
1524 /*lib=pkgname:5*/ /*X=var:1*/ /*Pi=const:8*/ /*T=typename:9*/ /*Y=var:10*/ /*F=func:12*/
1535 const pi, e = 3.1415, /*pi=undef*/ 2.71828 /*pi=const:13*/ /*e=const:13*/
1536 type /*t=undef*/ t /*t=typename:14*/ *t
1537 print(Y) /*Y=var:10*/
1538 x, Y := Y, /*x=undef*/ /*Y=var:10*/ Pi /*x=var:16*/ /*Y=var:16*/ ; _ = x; _ = Y
1539 var F = /*F=func:12*/ F /*F=var:17*/ ; _ = F
1542 for i, x := range /*i=undef*/ /*x=var:16*/ a /*i=var:20*/ /*x=var:20*/ { _ = i; _ = x }
1545 switch y := i.(type) { /*y=undef*/
1546 case /*y=undef*/ int /*y=var:23*/ :
1547 case float32, /*y=undef*/ float64 /*y=var:23*/ :
1548 default /*y=var:23*/:
1553 switch int := i.(type) {
1554 case /*int=typename:0*/ int /*int=var:31*/ :
1556 default /*int=var:31*/ :
1562 info.Uses = make(map[*syntax.Name]Object)
1563 makePkg("main", mainSrc)
1564 mainScope := imports["main"].Scope()
1566 rx := regexp.MustCompile(`^/\*(\w*)=([\w:]*)\*/$`)
1568 base := syntax.NewFileBase("main")
1569 syntax.CommentsDo(strings.NewReader(mainSrc), func(line, col uint, text string) {
1570 pos := syntax.MakePos(base, line, col)
1572 // Syntax errors are not comments.
1574 t.Errorf("%s: %s", pos, text)
1578 // Parse the assertion in the comment.
1579 m := rx.FindStringSubmatch(text)
1581 t.Errorf("%s: bad comment: %s", pos, text)
1584 name, want := m[1], m[2]
1586 // Look up the name in the innermost enclosing scope.
1587 inner := mainScope.Innermost(pos)
1589 t.Errorf("%s: at %s: can't find innermost scope", pos, text)
1593 if _, obj := inner.LookupParent(name, pos); obj != nil {
1594 kind := strings.ToLower(strings.TrimPrefix(reflect.TypeOf(obj).String(), "*types2."))
1595 got = fmt.Sprintf("%s:%d", kind, obj.Pos().Line())
1598 t.Errorf("%s: at %s: %s resolved to %s, want %s", pos, text, name, got, want)
1602 // Check that for each referring identifier,
1603 // a lookup of its name on the innermost
1604 // enclosing scope returns the correct object.
1606 for id, wantObj := range info.Uses {
1607 inner := mainScope.Innermost(id.Pos())
1609 t.Errorf("%s: can't find innermost scope enclosing %q", id.Pos(), id.Value)
1613 // Exclude selectors and qualified identifiers---lexical
1614 // refs only. (Ideally, we'd see if the AST parent is a
1615 // SelectorExpr, but that requires PathEnclosingInterval
1616 // from golang.org/x/tools/go/ast/astutil.)
1617 if id.Value == "X" {
1621 _, gotObj := inner.LookupParent(id.Value, id.Pos())
1622 if gotObj != wantObj {
1623 t.Errorf("%s: got %v, want %v", id.Pos(), gotObj, wantObj)
1629 var nopos syntax.Pos
1631 // newDefined creates a new defined type named T with the given underlying type.
1632 func newDefined(underlying Type) *Named {
1633 tname := NewTypeName(nopos, nil, "T", nil)
1634 return NewNamed(tname, underlying, nil)
1637 func TestConvertibleTo(t *testing.T) {
1638 for _, test := range []struct {
1642 {Typ[Int], Typ[Int], true},
1643 {Typ[Int], Typ[Float32], true},
1644 {Typ[Int], Typ[String], true},
1645 {newDefined(Typ[Int]), Typ[Int], true},
1646 {newDefined(new(Struct)), new(Struct), true},
1647 {newDefined(Typ[Int]), new(Struct), false},
1648 {Typ[UntypedInt], Typ[Int], true},
1649 {NewSlice(Typ[Int]), NewPointer(NewArray(Typ[Int], 10)), true},
1650 {NewSlice(Typ[Int]), NewArray(Typ[Int], 10), false},
1651 {NewSlice(Typ[Int]), NewPointer(NewArray(Typ[Uint], 10)), false},
1652 // Untyped string values are not permitted by the spec, so the behavior below is undefined.
1653 {Typ[UntypedString], Typ[String], true},
1655 if got := ConvertibleTo(test.v, test.t); got != test.want {
1656 t.Errorf("ConvertibleTo(%v, %v) = %t, want %t", test.v, test.t, got, test.want)
1661 func TestAssignableTo(t *testing.T) {
1662 for _, test := range []struct {
1666 {Typ[Int], Typ[Int], true},
1667 {Typ[Int], Typ[Float32], false},
1668 {newDefined(Typ[Int]), Typ[Int], false},
1669 {newDefined(new(Struct)), new(Struct), true},
1670 {Typ[UntypedBool], Typ[Bool], true},
1671 {Typ[UntypedString], Typ[Bool], false},
1672 // Neither untyped string nor untyped numeric assignments arise during
1673 // normal type checking, so the below behavior is technically undefined by
1675 {Typ[UntypedString], Typ[String], true},
1676 {Typ[UntypedInt], Typ[Int], true},
1678 if got := AssignableTo(test.v, test.t); got != test.want {
1679 t.Errorf("AssignableTo(%v, %v) = %t, want %t", test.v, test.t, got, test.want)
1684 func TestIdentical_issue15173(t *testing.T) {
1685 // Identical should allow nil arguments and be symmetric.
1686 for _, test := range []struct {
1690 {Typ[Int], Typ[Int], true},
1691 {Typ[Int], nil, false},
1692 {nil, Typ[Int], false},
1695 if got := Identical(test.x, test.y); got != test.want {
1696 t.Errorf("Identical(%v, %v) = %t", test.x, test.y, got)
1701 func TestIdenticalUnions(t *testing.T) {
1702 tname := NewTypeName(nopos, nil, "myInt", nil)
1703 myInt := NewNamed(tname, Typ[Int], nil)
1704 tmap := map[string]*Term{
1705 "int": NewTerm(false, Typ[Int]),
1706 "~int": NewTerm(true, Typ[Int]),
1707 "string": NewTerm(false, Typ[String]),
1708 "~string": NewTerm(true, Typ[String]),
1709 "myInt": NewTerm(false, myInt),
1711 makeUnion := func(s string) *Union {
1712 parts := strings.Split(s, "|")
1714 for _, p := range parts {
1717 t.Fatalf("missing term %q", p)
1719 terms = append(terms, term)
1721 return NewUnion(terms)
1723 for _, test := range []struct {
1727 // These tests are just sanity checks. The tests for type sets and
1728 // interfaces provide much more test coverage.
1729 {"int|~int", "~int", true},
1730 {"myInt|~int", "~int", true},
1731 {"int|string", "string|int", true},
1732 {"int|int|string", "string|int", true},
1733 {"myInt|string", "int|string", false},
1735 x := makeUnion(test.x)
1736 y := makeUnion(test.y)
1737 if got := Identical(x, y); got != test.want {
1738 t.Errorf("Identical(%v, %v) = %t", test.x, test.y, got)
1743 func TestIssue15305(t *testing.T) {
1744 const src = "package p; func f() int16; var _ = f(undef)"
1745 f, err := parseSrc("issue15305.go", src)
1750 Error: func(err error) {}, // allow errors
1753 Types: make(map[syntax.Expr]TypeAndValue),
1755 conf.Check("p", []*syntax.File{f}, info) // ignore result
1756 for e, tv := range info.Types {
1757 if _, ok := e.(*syntax.CallExpr); ok {
1758 if tv.Type != Typ[Int16] {
1759 t.Errorf("CallExpr has type %v, want int16", tv.Type)
1764 t.Errorf("CallExpr has no type")
1767 // TestCompositeLitTypes verifies that Info.Types registers the correct
1768 // types for composite literal expressions and composite literal type
1770 func TestCompositeLitTypes(t *testing.T) {
1771 for _, test := range []struct {
1774 {`[16]byte{}`, `[16]byte`},
1775 {`[...]byte{}`, `[0]byte`}, // test for issue #14092
1776 {`[...]int{1, 2, 3}`, `[3]int`}, // test for issue #14092
1777 {`[...]int{90: 0, 98: 1, 2}`, `[100]int`}, // test for issue #14092
1778 {`[]int{}`, `[]int`},
1779 {`map[string]bool{"foo": true}`, `map[string]bool`},
1780 {`struct{}{}`, `struct{}`},
1781 {`struct{x, y int; z complex128}{}`, `struct{x int; y int; z complex128}`},
1783 f, err := parseSrc(test.lit, "package p; var _ = "+test.lit)
1785 t.Fatalf("%s: %v", test.lit, err)
1789 Types: make(map[syntax.Expr]TypeAndValue),
1791 if _, err = new(Config).Check("p", []*syntax.File{f}, info); err != nil {
1792 t.Fatalf("%s: %v", test.lit, err)
1795 cmptype := func(x syntax.Expr, want string) {
1796 tv, ok := info.Types[x]
1798 t.Errorf("%s: no Types entry found", test.lit)
1802 t.Errorf("%s: type is nil", test.lit)
1805 if got := tv.Type.String(); got != want {
1806 t.Errorf("%s: got %v, want %s", test.lit, got, want)
1810 // test type of composite literal expression
1811 rhs := f.DeclList[0].(*syntax.VarDecl).Values
1812 cmptype(rhs, test.typ)
1814 // test type of composite literal type expression
1815 cmptype(rhs.(*syntax.CompositeLit).Type, test.typ)
1819 // TestObjectParents verifies that objects have parent scopes or not
1820 // as specified by the Object interface.
1821 func TestObjectParents(t *testing.T) {
1840 func f(x int) { y := x; print(y) }
1843 f, err := parseSrc("src", src)
1849 Defs: make(map[*syntax.Name]Object),
1851 if _, err = new(Config).Check("p", []*syntax.File{f}, info); err != nil {
1855 for ident, obj := range info.Defs {
1857 // only package names and implicit vars have a nil object
1858 // (in this test we only need to handle the package name)
1859 if ident.Value != "p" {
1860 t.Errorf("%v has nil object", ident)
1865 // struct fields, type-associated and interface methods
1866 // have no parent scope
1868 switch obj := obj.(type) {
1874 if obj.Type().(*Signature).Recv() != nil { // method
1879 gotParent := obj.Parent() != nil
1881 case gotParent && !wantParent:
1882 t.Errorf("%v: want no parent, got %s", ident, obj.Parent())
1883 case !gotParent && wantParent:
1884 t.Errorf("%v: no parent found", ident)
1889 // TestFailedImport tests that we don't get follow-on errors
1890 // elsewhere in a package due to failing to import a package.
1891 func TestFailedImport(t *testing.T) {
1892 testenv.MustHaveGoBuild(t)
1897 import foo "go/types/thisdirectorymustnotexistotherwisethistestmayfail/foo" // should only see an error here
1902 func f(x T) T { return foo.F(x) }
1904 f, err := parseSrc("src", src)
1908 files := []*syntax.File{f}
1910 // type-check using all possible importers
1911 for _, compiler := range []string{"gc", "gccgo", "source"} {
1914 Error: func(err error) {
1915 // we should only see the import error
1916 if errcount > 0 || !strings.Contains(err.Error(), "could not import") {
1917 t.Errorf("for %s importer, got unexpected error: %v", compiler, err)
1921 //Importer: importer.For(compiler, nil),
1925 Uses: make(map[*syntax.Name]Object),
1927 pkg, _ := conf.Check("p", files, info)
1929 t.Errorf("for %s importer, type-checking failed to return a package", compiler)
1933 imports := pkg.Imports()
1934 if len(imports) != 1 {
1935 t.Errorf("for %s importer, got %d imports, want 1", compiler, len(imports))
1939 if imp.Name() != "foo" {
1940 t.Errorf(`for %s importer, got %q, want "foo"`, compiler, imp.Name())
1944 // verify that all uses of foo refer to the imported package foo (imp)
1945 for ident, obj := range info.Uses {
1946 if ident.Value == "foo" {
1947 if obj, ok := obj.(*PkgName); ok {
1948 if obj.Imported() != imp {
1949 t.Errorf("%s resolved to %v; want %v", ident.Value, obj.Imported(), imp)
1952 t.Errorf("%s resolved to %v; want package name", ident.Value, obj)
1959 func TestInstantiate(t *testing.T) {
1960 // eventually we like more tests but this is a start
1961 const src = genericPkg + "p; type T[P any] *T[P]"
1962 pkg, err := pkgFor(".", src, nil)
1967 // type T should have one type parameter
1968 T := pkg.Scope().Lookup("T").Type().(*Named)
1969 if n := T.TypeParams().Len(); n != 1 {
1970 t.Fatalf("expected 1 type parameter; found %d", n)
1973 // instantiation should succeed (no endless recursion)
1974 // even with a nil *Checker
1975 res, err := Instantiate(nil, T, []Type{Typ[Int]}, false)
1980 // instantiated type should point to itself
1981 if p := res.Underlying().(*Pointer).Elem(); p != res {
1982 t.Fatalf("unexpected result type: %s points to %s", res, p)
1986 func TestInstantiateErrors(t *testing.T) {
1988 src string // by convention, T must be the type being instantiated
1990 wantAt int // -1 indicates no error
1992 {"type T[P interface{~string}] int", []Type{Typ[Int]}, 0},
1993 {"type T[P1 interface{int}, P2 interface{~string}] int", []Type{Typ[Int], Typ[Int]}, 1},
1994 {"type T[P1 any, P2 interface{~[]P1}] int", []Type{Typ[Int], NewSlice(Typ[String])}, 1},
1995 {"type T[P1 interface{~[]P2}, P2 any] int", []Type{NewSlice(Typ[String]), Typ[Int]}, 0},
1998 for _, test := range tests {
1999 src := genericPkg + "p; " + test.src
2000 pkg, err := pkgFor(".", src, nil)
2005 T := pkg.Scope().Lookup("T").Type().(*Named)
2007 _, err = Instantiate(nil, T, test.targs, true)
2009 t.Fatalf("Instantiate(%v, %v) returned nil error, want non-nil", T, test.targs)
2012 gotAt := err.(ArgumentError).Index()
2013 if gotAt != test.wantAt {
2014 t.Errorf("Instantate(%v, %v): error at index %d, want index %d", T, test.targs, gotAt, test.wantAt)
2019 func TestInstanceIdentity(t *testing.T) {
2020 imports := make(testImporter)
2021 conf := Config{Importer: imports}
2022 makePkg := func(src string) {
2023 f, err := parseSrc("", src)
2027 name := f.PkgName.Value
2028 pkg, err := conf.Check(name, []*syntax.File{f}, nil)
2034 makePkg(genericPkg + `lib; type T[P any] struct{}`)
2035 makePkg(genericPkg + `a; import "generic_lib"; var A generic_lib.T[int]`)
2036 makePkg(genericPkg + `b; import "generic_lib"; var B generic_lib.T[int]`)
2037 a := imports["generic_a"].Scope().Lookup("A")
2038 b := imports["generic_b"].Scope().Lookup("B")
2039 if !Identical(a.Type(), b.Type()) {
2040 t.Errorf("mismatching types: a.A: %s, b.B: %s", a.Type(), b.Type())