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"
18 . "cmd/compile/internal/types2"
21 // brokenPkg is a source prefix for packages that are not expected to parse
22 // or type-check cleanly. They are always parsed assuming that they contain
24 const brokenPkg = "package broken_"
26 func parseSrc(path, src string) (*syntax.File, error) {
27 errh := func(error) {} // dummy error handler so that parsing continues in presence of errors
28 return syntax.Parse(syntax.NewFileBase(path), strings.NewReader(src), errh, nil, syntax.AllowGenerics)
31 func pkgFor(path, source string, info *Info) (*Package, error) {
32 f, err := parseSrc(path, source)
36 conf := Config{Importer: defaultImporter()}
37 return conf.Check(f.PkgName.Value, []*syntax.File{f}, info)
40 func mustTypecheck(t *testing.T, path, source string, info *Info) string {
41 pkg, err := pkgFor(path, source, info)
45 name = "package " + pkg.Name()
47 t.Fatalf("%s: didn't type-check (%s)", name, err)
52 func mayTypecheck(t *testing.T, path, source string, info *Info) (string, error) {
53 f, err := parseSrc(path, source)
54 if f == nil { // ignore errors unless f is nil
55 t.Fatalf("%s: unable to parse: %s", path, err)
58 Error: func(err error) {},
59 Importer: defaultImporter(),
61 pkg, err := conf.Check(f.PkgName.Value, []*syntax.File{f}, info)
62 return pkg.Name(), err
65 func TestValuesInfo(t *testing.T) {
66 var tests = []struct {
68 expr string // constant expression
69 typ string // constant type
70 val string // constant value
72 {`package a0; const _ = false`, `false`, `untyped bool`, `false`},
73 {`package a1; const _ = 0`, `0`, `untyped int`, `0`},
74 {`package a2; const _ = 'A'`, `'A'`, `untyped rune`, `65`},
75 {`package a3; const _ = 0.`, `0.`, `untyped float`, `0`},
76 {`package a4; const _ = 0i`, `0i`, `untyped complex`, `(0 + 0i)`},
77 {`package a5; const _ = "foo"`, `"foo"`, `untyped string`, `"foo"`},
79 {`package b0; var _ = false`, `false`, `bool`, `false`},
80 {`package b1; var _ = 0`, `0`, `int`, `0`},
81 {`package b2; var _ = 'A'`, `'A'`, `rune`, `65`},
82 {`package b3; var _ = 0.`, `0.`, `float64`, `0`},
83 {`package b4; var _ = 0i`, `0i`, `complex128`, `(0 + 0i)`},
84 {`package b5; var _ = "foo"`, `"foo"`, `string`, `"foo"`},
86 {`package c0a; var _ = bool(false)`, `false`, `bool`, `false`},
87 {`package c0b; var _ = bool(false)`, `bool(false)`, `bool`, `false`},
88 {`package c0c; type T bool; var _ = T(false)`, `T(false)`, `c0c.T`, `false`},
90 {`package c1a; var _ = int(0)`, `0`, `int`, `0`},
91 {`package c1b; var _ = int(0)`, `int(0)`, `int`, `0`},
92 {`package c1c; type T int; var _ = T(0)`, `T(0)`, `c1c.T`, `0`},
94 {`package c2a; var _ = rune('A')`, `'A'`, `rune`, `65`},
95 {`package c2b; var _ = rune('A')`, `rune('A')`, `rune`, `65`},
96 {`package c2c; type T rune; var _ = T('A')`, `T('A')`, `c2c.T`, `65`},
98 {`package c3a; var _ = float32(0.)`, `0.`, `float32`, `0`},
99 {`package c3b; var _ = float32(0.)`, `float32(0.)`, `float32`, `0`},
100 {`package c3c; type T float32; var _ = T(0.)`, `T(0.)`, `c3c.T`, `0`},
102 {`package c4a; var _ = complex64(0i)`, `0i`, `complex64`, `(0 + 0i)`},
103 {`package c4b; var _ = complex64(0i)`, `complex64(0i)`, `complex64`, `(0 + 0i)`},
104 {`package c4c; type T complex64; var _ = T(0i)`, `T(0i)`, `c4c.T`, `(0 + 0i)`},
106 {`package c5a; var _ = string("foo")`, `"foo"`, `string`, `"foo"`},
107 {`package c5b; var _ = string("foo")`, `string("foo")`, `string`, `"foo"`},
108 {`package c5c; type T string; var _ = T("foo")`, `T("foo")`, `c5c.T`, `"foo"`},
109 {`package c5d; var _ = string(65)`, `65`, `untyped int`, `65`},
110 {`package c5e; var _ = string('A')`, `'A'`, `untyped rune`, `65`},
111 {`package c5f; type T string; var _ = T('A')`, `'A'`, `untyped rune`, `65`},
112 {`package c5g; var s uint; var _ = string(1 << s)`, `1 << s`, `untyped int`, ``},
114 {`package d0; var _ = []byte("foo")`, `"foo"`, `string`, `"foo"`},
115 {`package d1; var _ = []byte(string("foo"))`, `"foo"`, `string`, `"foo"`},
116 {`package d2; var _ = []byte(string("foo"))`, `string("foo")`, `string`, `"foo"`},
117 {`package d3; type T []byte; var _ = T("foo")`, `"foo"`, `string`, `"foo"`},
119 {`package e0; const _ = float32( 1e-200)`, `float32(1e-200)`, `float32`, `0`},
120 {`package e1; const _ = float32(-1e-200)`, `float32(-1e-200)`, `float32`, `0`},
121 {`package e2; const _ = float64( 1e-2000)`, `float64(1e-2000)`, `float64`, `0`},
122 {`package e3; const _ = float64(-1e-2000)`, `float64(-1e-2000)`, `float64`, `0`},
123 {`package e4; const _ = complex64( 1e-200)`, `complex64(1e-200)`, `complex64`, `(0 + 0i)`},
124 {`package e5; const _ = complex64(-1e-200)`, `complex64(-1e-200)`, `complex64`, `(0 + 0i)`},
125 {`package e6; const _ = complex128( 1e-2000)`, `complex128(1e-2000)`, `complex128`, `(0 + 0i)`},
126 {`package e7; const _ = complex128(-1e-2000)`, `complex128(-1e-2000)`, `complex128`, `(0 + 0i)`},
128 {`package f0 ; var _ float32 = 1e-200`, `1e-200`, `float32`, `0`},
129 {`package f1 ; var _ float32 = -1e-200`, `-1e-200`, `float32`, `0`},
130 {`package f2a; var _ float64 = 1e-2000`, `1e-2000`, `float64`, `0`},
131 {`package f3a; var _ float64 = -1e-2000`, `-1e-2000`, `float64`, `0`},
132 {`package f2b; var _ = 1e-2000`, `1e-2000`, `float64`, `0`},
133 {`package f3b; var _ = -1e-2000`, `-1e-2000`, `float64`, `0`},
134 {`package f4 ; var _ complex64 = 1e-200 `, `1e-200`, `complex64`, `(0 + 0i)`},
135 {`package f5 ; var _ complex64 = -1e-200 `, `-1e-200`, `complex64`, `(0 + 0i)`},
136 {`package f6a; var _ complex128 = 1e-2000i`, `1e-2000i`, `complex128`, `(0 + 0i)`},
137 {`package f7a; var _ complex128 = -1e-2000i`, `-1e-2000i`, `complex128`, `(0 + 0i)`},
138 {`package f6b; var _ = 1e-2000i`, `1e-2000i`, `complex128`, `(0 + 0i)`},
139 {`package f7b; var _ = -1e-2000i`, `-1e-2000i`, `complex128`, `(0 + 0i)`},
141 {`package g0; const (a = len([iota]int{}); b; c); const _ = c`, `c`, `int`, `2`}, // issue #22341
142 {`package g1; var(j int32; s int; n = 1.0<<s == j)`, `1.0`, `int32`, `1`}, // issue #48422
145 for _, test := range tests {
147 Types: make(map[syntax.Expr]TypeAndValue),
149 name := mustTypecheck(t, "ValuesInfo", test.src, &info)
151 // look for expression
153 for e := range info.Types {
154 if syntax.String(e) == test.expr {
160 t.Errorf("package %s: no expression found for %s", name, test.expr)
163 tv := info.Types[expr]
165 // check that type is correct
166 if got := tv.Type.String(); got != test.typ {
167 t.Errorf("package %s: got type %s; want %s", name, got, test.typ)
171 // if we have a constant, check that value is correct
173 if got := tv.Value.ExactString(); got != test.val {
174 t.Errorf("package %s: got value %s; want %s", name, got, test.val)
178 t.Errorf("package %s: no constant found; want %s", name, test.val)
184 func TestTypesInfo(t *testing.T) {
185 var tests = []struct {
187 expr string // expression
188 typ string // value type
190 // single-valued expressions of untyped constants
191 {`package b0; var x interface{} = false`, `false`, `bool`},
192 {`package b1; var x interface{} = 0`, `0`, `int`},
193 {`package b2; var x interface{} = 0.`, `0.`, `float64`},
194 {`package b3; var x interface{} = 0i`, `0i`, `complex128`},
195 {`package b4; var x interface{} = "foo"`, `"foo"`, `string`},
198 {`package n0; var _ *int = nil`, `nil`, `*int`},
199 {`package n1; var _ func() = nil`, `nil`, `func()`},
200 {`package n2; var _ []byte = nil`, `nil`, `[]byte`},
201 {`package n3; var _ map[int]int = nil`, `nil`, `map[int]int`},
202 {`package n4; var _ chan int = nil`, `nil`, `chan int`},
203 {`package n5a; var _ interface{} = (*int)(nil)`, `nil`, `*int`},
204 {`package n5b; var _ interface{m()} = nil`, `nil`, `interface{m()}`},
205 {`package n6; import "unsafe"; var _ unsafe.Pointer = nil`, `nil`, `unsafe.Pointer`},
207 {`package n10; var (x *int; _ = x == nil)`, `nil`, `*int`},
208 {`package n11; var (x func(); _ = x == nil)`, `nil`, `func()`},
209 {`package n12; var (x []byte; _ = x == nil)`, `nil`, `[]byte`},
210 {`package n13; var (x map[int]int; _ = x == nil)`, `nil`, `map[int]int`},
211 {`package n14; var (x chan int; _ = x == nil)`, `nil`, `chan int`},
212 {`package n15a; var (x interface{}; _ = x == (*int)(nil))`, `nil`, `*int`},
213 {`package n15b; var (x interface{m()}; _ = x == nil)`, `nil`, `interface{m()}`},
214 {`package n15; import "unsafe"; var (x unsafe.Pointer; _ = x == nil)`, `nil`, `unsafe.Pointer`},
216 {`package n20; var _ = (*int)(nil)`, `nil`, `*int`},
217 {`package n21; var _ = (func())(nil)`, `nil`, `func()`},
218 {`package n22; var _ = ([]byte)(nil)`, `nil`, `[]byte`},
219 {`package n23; var _ = (map[int]int)(nil)`, `nil`, `map[int]int`},
220 {`package n24; var _ = (chan int)(nil)`, `nil`, `chan int`},
221 {`package n25a; var _ = (interface{})((*int)(nil))`, `nil`, `*int`},
222 {`package n25b; var _ = (interface{m()})(nil)`, `nil`, `interface{m()}`},
223 {`package n26; import "unsafe"; var _ = unsafe.Pointer(nil)`, `nil`, `unsafe.Pointer`},
225 {`package n30; func f(*int) { f(nil) }`, `nil`, `*int`},
226 {`package n31; func f(func()) { f(nil) }`, `nil`, `func()`},
227 {`package n32; func f([]byte) { f(nil) }`, `nil`, `[]byte`},
228 {`package n33; func f(map[int]int) { f(nil) }`, `nil`, `map[int]int`},
229 {`package n34; func f(chan int) { f(nil) }`, `nil`, `chan int`},
230 {`package n35a; func f(interface{}) { f((*int)(nil)) }`, `nil`, `*int`},
231 {`package n35b; func f(interface{m()}) { f(nil) }`, `nil`, `interface{m()}`},
232 {`package n35; import "unsafe"; func f(unsafe.Pointer) { f(nil) }`, `nil`, `unsafe.Pointer`},
234 // comma-ok expressions
235 {`package p0; var x interface{}; var _, _ = x.(int)`,
239 {`package p1; var x interface{}; func _() { _, _ = x.(int) }`,
243 {`package p2a; type mybool bool; var m map[string]complex128; var b mybool; func _() { _, b = m["foo"] }`,
245 `(complex128, p2a.mybool)`,
247 {`package p2b; var m map[string]complex128; var b bool; func _() { _, b = m["foo"] }`,
249 `(complex128, bool)`,
251 {`package p3; var c chan string; var _, _ = <-c`,
257 {`package issue6796_a; var x interface{}; var _, _ = (x.(int))`,
261 {`package issue6796_b; var c chan string; var _, _ = (<-c)`,
265 {`package issue6796_c; var c chan string; var _, _ = (<-c)`,
269 {`package issue6796_d; var c chan string; var _, _ = ((<-c))`,
273 {`package issue6796_e; func f(c chan string) { _, _ = ((<-c)) }`,
279 {`package issue7060_a; var ( m map[int]string; x, ok = m[0] )`,
283 {`package issue7060_b; var ( m map[int]string; x, ok interface{} = m[0] )`,
287 {`package issue7060_c; func f(x interface{}, ok bool, m map[int]string) { x, ok = m[0] }`,
291 {`package issue7060_d; var ( ch chan string; x, ok = <-ch )`,
295 {`package issue7060_e; var ( ch chan string; x, ok interface{} = <-ch )`,
299 {`package issue7060_f; func f(x interface{}, ok bool, ch chan string) { x, ok = <-ch }`,
305 {`package issue28277_a; func f(...int)`,
309 {`package issue28277_b; func f(a, b int, c ...[]struct{})`,
314 // tests for broken code that doesn't parse or type-check
315 {brokenPkg + `x0; func _() { var x struct {f string}; x.f := 0 }`, `x.f`, `string`},
316 {brokenPkg + `x1; func _() { var z string; type x struct {f string}; y := &x{q: z}}`, `z`, `string`},
317 {brokenPkg + `x2; func _() { var a, b string; type x struct {f string}; z := &x{f: a, f: b,}}`, `b`, `string`},
318 {brokenPkg + `x3; var x = panic("");`, `panic`, `func(interface{})`},
319 {`package x4; func _() { panic("") }`, `panic`, `func(interface{})`},
320 {brokenPkg + `x5; func _() { var x map[string][...]int; x = map[string][...]int{"": {1,2,3}} }`, `x`, `map[string]invalid type`},
322 // parameterized functions
323 {`package p0; func f[T any](T) {}; var _ = f[int]`, `f`, `func[T any](T)`},
324 {`package p1; func f[T any](T) {}; var _ = f[int]`, `f[int]`, `func(int)`},
325 {`package p2; func f[T any](T) {}; func _() { f(42) }`, `f`, `func(int)`},
326 {`package p3; func f[T any](T) {}; func _() { f[int](42) }`, `f[int]`, `func(int)`},
327 {`package p4; func f[T any](T) {}; func _() { f[int](42) }`, `f`, `func[T any](T)`},
328 {`package p5; func f[T any](T) {}; func _() { f(42) }`, `f(42)`, `()`},
331 {`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
332 {`package t1; type t[P any] int; var _ t[int]`, `t`, `t1.t[P any]`},
333 {`package t2; type t[P interface{}] int; var _ t[int]`, `t`, `t2.t[P interface{}]`},
334 {`package t3; type t[P, Q interface{}] int; var _ t[int, int]`, `t`, `t3.t[P, Q interface{}]`},
335 {brokenPkg + `t4; type t[P, Q interface{ m() }] int; var _ t[int, int]`, `t`, `broken_t4.t[P, Q interface{m()}]`},
337 // instantiated types must be sanitized
338 {`package g0; type t[P any] int; var x struct{ f t[int] }; var _ = x.f`, `x.f`, `g0.t[int]`},
341 {`package issue45096; func _[T interface{ ~int8 | ~int16 | ~int32 }](x T) { _ = x < 0 }`, `0`, `T`},
344 {`package p; import "unsafe"; type S struct { f int }; var s S; var _ = unsafe.Offsetof(s.f)`, `s.f`, `int`},
347 for _, test := range tests {
348 info := Info{Types: make(map[syntax.Expr]TypeAndValue)}
350 if strings.HasPrefix(test.src, brokenPkg) {
352 name, err = mayTypecheck(t, "TypesInfo", test.src, &info)
354 t.Errorf("package %s: expected to fail but passed", name)
358 name = mustTypecheck(t, "TypesInfo", test.src, &info)
361 // look for expression type
363 for e, tv := range info.Types {
364 if syntax.String(e) == test.expr {
370 t.Errorf("package %s: no type found for %s", name, test.expr)
374 // check that type is correct
375 if got := typ.String(); got != test.typ {
376 t.Errorf("package %s: got %s; want %s", name, got, test.typ)
381 func TestInstanceInfo(t *testing.T) {
382 var tests = []struct {
388 {`package p0; func f[T any](T) {}; func _() { f(42) }`,
393 {`package p1; func f[T any](T) T { panic(0) }; func _() { f('@') }`,
398 {`package p2; func f[T any](...T) T { panic(0) }; func _() { f(0i) }`,
400 []string{`complex128`},
401 `func(...complex128) complex128`,
403 {`package p3; func f[A, B, C any](A, *B, []C) {}; func _() { f(1.2, new(string), []byte{}) }`,
405 []string{`float64`, `string`, `byte`},
406 `func(float64, *string, []byte)`,
408 {`package p4; func f[A, B any](A, *B, ...[]B) {}; func _() { f(1.2, new(byte)) }`,
410 []string{`float64`, `byte`},
411 `func(float64, *byte, ...[]byte)`,
414 // we don't know how to translate these but we can type-check them
415 {`package q0; type T struct{}; func (T) m[P any](P) {}; func _(x T) { x.m(42) }`,
420 {`package q1; type T struct{}; func (T) m[P any](P) P { panic(0) }; func _(x T) { x.m(42) }`,
425 {`package q2; type T struct{}; func (T) m[P any](...P) P { panic(0) }; func _(x T) { x.m(42) }`,
430 {`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{}) }`,
432 []string{`float64`, `string`, `byte`},
433 `func(float64, *string, []byte)`,
435 {`package q4; type T struct{}; func (T) m[A, B any](A, *B, ...[]B) {}; func _(x T) { x.m(1.2, new(byte)) }`,
437 []string{`float64`, `byte`},
438 `func(float64, *byte, ...[]byte)`,
441 {`package r0; type T[P any] struct{}; func (_ T[P]) m[Q any](Q) {}; func _[P any](x T[P]) { x.m(42) }`,
446 // TODO(gri) record method type parameters in syntax.FuncType so we can check this
447 // {`package r1; type T interface{ m[P any](P) }; func _(x T) { x.m(4.2) }`,
449 // []string{`float64`},
453 {`package s1; func f[T any, P interface{~*T}](x T) {}; func _(x string) { f(x) }`,
455 []string{`string`, `*string`},
458 {`package s2; func f[T any, P interface{~*T}](x []T) {}; func _(x []int) { f(x) }`,
460 []string{`int`, `*int`},
463 {`package s3; type C[T any] interface{~chan<- T}; func f[T any, P C[T]](x []T) {}; func _(x []int) { f(x) }`,
465 []string{`int`, `chan<- int`},
468 {`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) }`,
470 []string{`int`, `chan<- int`, `chan<- []*chan<- int`},
474 {`package t1; func f[T any, P interface{~*T}]() T { panic(0) }; func _() { _ = f[string] }`,
476 []string{`string`, `*string`},
479 {`package t2; func f[T any, P interface{~*T}]() T { panic(0) }; func _() { _ = (f[string]) }`,
481 []string{`string`, `*string`},
484 {`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] }`,
486 []string{`int`, `chan<- int`, `chan<- []*chan<- int`},
489 {`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] }`,
491 []string{`int`, `chan<- int`, `chan<- []*chan<- int`},
494 {`package i0; import lib "generic_lib"; func _() { lib.F(42) }`,
499 {`package type0; type T[P interface{~int}] struct{ x P }; var _ T[int]`,
504 {`package type1; type T[P interface{~int}] struct{ x P }; var _ (T[int])`,
509 {`package type2; type T[P interface{~int}] struct{ x P }; var _ T[(int)]`,
514 {`package type3; type T[P1 interface{~[]P2}, P2 any] struct{ x P1; y P2 }; var _ T[[]int, int]`,
516 []string{`[]int`, `int`},
517 `struct{x []int; y int}`,
519 {`package type4; import lib "generic_lib"; var _ lib.T[int]`,
526 for _, test := range tests {
527 const lib = `package generic_lib
534 imports := make(testImporter)
535 conf := Config{Importer: imports}
536 instances := make(map[*syntax.Name]Instance)
537 uses := make(map[*syntax.Name]Object)
538 makePkg := func(src string) *Package {
539 f, err := parseSrc("p.go", src)
543 pkg, err := conf.Check("", []*syntax.File{f}, &Info{Instances: instances, Uses: uses})
547 imports[pkg.Name()] = pkg
551 pkg := makePkg(test.src)
553 // look for instance information
556 for ident, inst := range instances {
557 if syntax.String(ident) == test.name {
558 for i := 0; i < inst.TypeArgs.Len(); i++ {
559 targs = append(targs, inst.TypeArgs.At(i))
563 // Check that we can find the corresponding parameterized type.
564 ptype := uses[ident].Type()
565 lister, _ := ptype.(interface{ TypeParams() *TypeParamList })
566 if lister == nil || lister.TypeParams().Len() == 0 {
567 t.Errorf("package %s: info.Types[%v] = %v, want parameterized type", pkg.Name(), ident, ptype)
571 // Verify the invariant that re-instantiating the generic type with
572 // TypeArgs results in an equivalent type.
573 inst2, err := Instantiate(nil, ptype, targs, true)
575 t.Errorf("Instantiate(%v, %v) failed: %v", ptype, targs, err)
577 if !Identical(inst.Type, inst2) {
578 t.Errorf("%v and %v are not identical", inst.Type, inst2)
584 t.Errorf("package %s: no instance information found for %s", pkg.Name(), test.name)
588 // check that type arguments are correct
589 if len(targs) != len(test.targs) {
590 t.Errorf("package %s: got %d type arguments; want %d", pkg.Name(), len(targs), len(test.targs))
593 for i, targ := range targs {
594 if got := targ.String(); got != test.targs[i] {
595 t.Errorf("package %s, %d. type argument: got %s; want %s", pkg.Name(), i, got, test.targs[i])
600 // check that the types match
601 if got := typ.Underlying().String(); got != test.typ {
602 t.Errorf("package %s: got %s; want %s", pkg.Name(), got, test.typ)
607 func TestDefsInfo(t *testing.T) {
608 var tests = []struct {
613 {`package p0; const x = 42`, `x`, `const p0.x untyped int`},
614 {`package p1; const x int = 42`, `x`, `const p1.x int`},
615 {`package p2; var x int`, `x`, `var p2.x int`},
616 {`package p3; type x int`, `x`, `type p3.x int`},
617 {`package p4; func f()`, `f`, `func p4.f()`},
618 {`package p5; func f() int { x, _ := 1, 2; return x }`, `_`, `var _ int`},
621 for _, test := range tests {
623 Defs: make(map[*syntax.Name]Object),
625 name := mustTypecheck(t, "DefsInfo", test.src, &info)
629 for id, obj := range info.Defs {
630 if id.Value == test.obj {
636 t.Errorf("package %s: %s not found", name, test.obj)
640 if got := def.String(); got != test.want {
641 t.Errorf("package %s: got %s; want %s", name, got, test.want)
646 func TestUsesInfo(t *testing.T) {
647 var tests = []struct {
652 {`package p0; func _() { _ = x }; const x = 42`, `x`, `const p0.x untyped int`},
653 {`package p1; func _() { _ = x }; const x int = 42`, `x`, `const p1.x int`},
654 {`package p2; func _() { _ = x }; var x int`, `x`, `var p2.x int`},
655 {`package p3; func _() { type _ x }; type x int`, `x`, `type p3.x int`},
656 {`package p4; func _() { _ = f }; func f()`, `f`, `func p4.f()`},
659 for _, test := range tests {
661 Uses: make(map[*syntax.Name]Object),
663 name := mustTypecheck(t, "UsesInfo", test.src, &info)
667 for id, obj := range info.Uses {
668 if id.Value == test.obj {
674 t.Errorf("package %s: %s not found", name, test.obj)
678 if got := use.String(); got != test.want {
679 t.Errorf("package %s: got %s; want %s", name, got, test.want)
684 func TestImplicitsInfo(t *testing.T) {
685 testenv.MustHaveGoBuild(t)
687 var tests = []struct {
691 {`package p2; import . "fmt"; var _ = Println`, ""}, // no Implicits entry
692 {`package p0; import local "fmt"; var _ = local.Println`, ""}, // no Implicits entry
693 {`package p1; import "fmt"; var _ = fmt.Println`, "importSpec: package fmt"},
695 {`package p3; func f(x interface{}) { switch x.(type) { case int: } }`, ""}, // no Implicits entry
696 {`package p4; func f(x interface{}) { switch t := x.(type) { case int: _ = t } }`, "caseClause: var t int"},
697 {`package p5; func f(x interface{}) { switch t := x.(type) { case int, uint: _ = t } }`, "caseClause: var t interface{}"},
698 {`package p6; func f(x interface{}) { switch t := x.(type) { default: _ = t } }`, "caseClause: var t interface{}"},
700 {`package p7; func f(x int) {}`, ""}, // no Implicits entry
701 {`package p8; func f(int) {}`, "field: var int"},
702 {`package p9; func f() (complex64) { return 0 }`, "field: var complex64"},
703 {`package p10; type T struct{}; func (*T) f() {}`, "field: var *p10.T"},
706 for _, test := range tests {
708 Implicits: make(map[syntax.Node]Object),
710 name := mustTypecheck(t, "ImplicitsInfo", test.src, &info)
712 // the test cases expect at most one Implicits entry
713 if len(info.Implicits) > 1 {
714 t.Errorf("package %s: %d Implicits entries found", name, len(info.Implicits))
718 // extract Implicits entry, if any
720 for n, obj := range info.Implicits {
721 switch x := n.(type) {
722 case *syntax.ImportDecl:
724 case *syntax.CaseClause:
729 t.Fatalf("package %s: unexpected %T", name, x)
731 got += ": " + obj.String()
735 if got != test.want {
736 t.Errorf("package %s: got %q; want %q", name, got, test.want)
741 func predString(tv TypeAndValue) string {
743 pred := func(b bool, s string) {
746 buf.WriteString(", ")
752 pred(tv.IsVoid(), "void")
753 pred(tv.IsType(), "type")
754 pred(tv.IsBuiltin(), "builtin")
755 pred(tv.IsValue() && tv.Value != nil, "const")
756 pred(tv.IsValue() && tv.Value == nil, "value")
757 pred(tv.IsNil(), "nil")
758 pred(tv.Addressable(), "addressable")
759 pred(tv.Assignable(), "assignable")
760 pred(tv.HasOk(), "hasOk")
768 func TestPredicatesInfo(t *testing.T) {
769 testenv.MustHaveGoBuild(t)
771 var tests = []struct {
777 {`package n0; func f() { f() }`, `f()`, `void`},
780 {`package t0; type _ int`, `int`, `type`},
781 {`package t1; type _ []int`, `[]int`, `type`},
782 {`package t2; type _ func()`, `func()`, `type`},
783 {`package t3; type _ func(int)`, `int`, `type`},
784 {`package t3; type _ func(...int)`, `...int`, `type`},
787 {`package b0; var _ = len("")`, `len`, `builtin`},
788 {`package b1; var _ = (len)("")`, `(len)`, `builtin`},
791 {`package c0; var _ = 42`, `42`, `const`},
792 {`package c1; var _ = "foo" + "bar"`, `"foo" + "bar"`, `const`},
793 {`package c2; const (i = 1i; _ = i)`, `i`, `const`},
796 {`package v0; var (a, b int; _ = a + b)`, `a + b`, `value`},
797 {`package v1; var _ = &[]int{1}`, `[]int{…}`, `value`},
798 {`package v2; var _ = func(){}`, `func() {}`, `value`},
799 {`package v4; func f() { _ = f }`, `f`, `value`},
800 {`package v3; var _ *int = nil`, `nil`, `value, nil`},
801 {`package v3; var _ *int = (nil)`, `(nil)`, `value, nil`},
803 // addressable (and thus assignable) operands
804 {`package a0; var (x int; _ = x)`, `x`, `value, addressable, assignable`},
805 {`package a1; var (p *int; _ = *p)`, `*p`, `value, addressable, assignable`},
806 {`package a2; var (s []int; _ = s[0])`, `s[0]`, `value, addressable, assignable`},
807 {`package a3; var (s struct{f int}; _ = s.f)`, `s.f`, `value, addressable, assignable`},
808 {`package a4; var (a [10]int; _ = a[0])`, `a[0]`, `value, addressable, assignable`},
809 {`package a5; func _(x int) { _ = x }`, `x`, `value, addressable, assignable`},
810 {`package a6; func _()(x int) { _ = x; return }`, `x`, `value, addressable, assignable`},
811 {`package a7; type T int; func (x T) _() { _ = x }`, `x`, `value, addressable, assignable`},
812 // composite literals are not addressable
814 // assignable but not addressable values
815 {`package s0; var (m map[int]int; _ = m[0])`, `m[0]`, `value, assignable, hasOk`},
816 {`package s1; var (m map[int]int; _, _ = m[0])`, `m[0]`, `value, assignable, hasOk`},
819 {`package k0; var (ch chan int; _ = <-ch)`, `<-ch`, `value, hasOk`},
820 {`package k1; var (ch chan int; _, _ = <-ch)`, `<-ch`, `value, hasOk`},
823 // - package names are collected in the Uses map
824 // - identifiers being declared are collected in the Defs map
825 {`package m0; import "os"; func _() { _ = os.Stdout }`, `os`, `<missing>`},
826 {`package m1; import p "os"; func _() { _ = p.Stdout }`, `p`, `<missing>`},
827 {`package m2; const c = 0`, `c`, `<missing>`},
828 {`package m3; type T int`, `T`, `<missing>`},
829 {`package m4; var v int`, `v`, `<missing>`},
830 {`package m5; func f() {}`, `f`, `<missing>`},
831 {`package m6; func _(x int) {}`, `x`, `<missing>`},
832 {`package m6; func _()(x int) { return }`, `x`, `<missing>`},
833 {`package m6; type T int; func (x T) _() {}`, `x`, `<missing>`},
836 for _, test := range tests {
837 info := Info{Types: make(map[syntax.Expr]TypeAndValue)}
838 name := mustTypecheck(t, "PredicatesInfo", test.src, &info)
840 // look for expression predicates
842 for e, tv := range info.Types {
843 //println(name, syntax.String(e))
844 if syntax.String(e) == test.expr {
850 if got != test.pred {
851 t.Errorf("package %s: got %s; want %s", name, got, test.pred)
856 func TestScopesInfo(t *testing.T) {
857 testenv.MustHaveGoBuild(t)
859 var tests = []struct {
861 scopes []string // list of scope descriptors of the form kind:varlist
863 {`package p0`, []string{
866 {`package p1; import ( "fmt"; m "math"; _ "os" ); var ( _ = fmt.Println; _ = m.Pi )`, []string{
869 {`package p2; func _() {}`, []string{
872 {`package p3; func _(x, y int) {}`, []string{
875 {`package p4; func _(x, y int) { x, z := 1, 2; _ = z }`, []string{
876 "file:", "func:x y z", // redeclaration of x
878 {`package p5; func _(x, y int) (u, _ int) { return }`, []string{
879 "file:", "func:u x y",
881 {`package p6; func _() { { var x int; _ = x } }`, []string{
882 "file:", "func:", "block:x",
884 {`package p7; func _() { if true {} }`, []string{
885 "file:", "func:", "if:", "block:",
887 {`package p8; func _() { if x := 0; x < 0 { y := x; _ = y } }`, []string{
888 "file:", "func:", "if:x", "block:y",
890 {`package p9; func _() { switch x := 0; x {} }`, []string{
891 "file:", "func:", "switch:x",
893 {`package p10; func _() { switch x := 0; x { case 1: y := x; _ = y; default: }}`, []string{
894 "file:", "func:", "switch:x", "case:y", "case:",
896 {`package p11; func _(t interface{}) { switch t.(type) {} }`, []string{
897 "file:", "func:t", "switch:",
899 {`package p12; func _(t interface{}) { switch t := t; t.(type) {} }`, []string{
900 "file:", "func:t", "switch:t",
902 {`package p13; func _(t interface{}) { switch x := t.(type) { case int: _ = x } }`, []string{
903 "file:", "func:t", "switch:", "case:x", // x implicitly declared
905 {`package p14; func _() { select{} }`, []string{
908 {`package p15; func _(c chan int) { select{ case <-c: } }`, []string{
909 "file:", "func:c", "comm:",
911 {`package p16; func _(c chan int) { select{ case i := <-c: x := i; _ = x} }`, []string{
912 "file:", "func:c", "comm:i x",
914 {`package p17; func _() { for{} }`, []string{
915 "file:", "func:", "for:", "block:",
917 {`package p18; func _(n int) { for i := 0; i < n; i++ { _ = i } }`, []string{
918 "file:", "func:n", "for:i", "block:",
920 {`package p19; func _(a []int) { for i := range a { _ = i} }`, []string{
921 "file:", "func:a", "for:i", "block:",
923 {`package p20; var s int; func _(a []int) { for i, x := range a { s += x; _ = i } }`, []string{
924 "file:", "func:a", "for:i x", "block:",
928 for _, test := range tests {
929 info := Info{Scopes: make(map[syntax.Node]*Scope)}
930 name := mustTypecheck(t, "ScopesInfo", test.src, &info)
932 // number of scopes must match
933 if len(info.Scopes) != len(test.scopes) {
934 t.Errorf("package %s: got %d scopes; want %d", name, len(info.Scopes), len(test.scopes))
937 // scope descriptions must match
938 for node, scope := range info.Scopes {
943 case *syntax.FuncType:
945 case *syntax.BlockStmt:
949 case *syntax.SwitchStmt:
951 case *syntax.SelectStmt:
953 case *syntax.CaseClause:
955 case *syntax.CommClause:
957 case *syntax.ForStmt:
960 kind = fmt.Sprintf("%T", node)
963 // look for matching scope description
964 desc := kind + ":" + strings.Join(scope.Names(), " ")
966 for _, d := range test.scopes {
973 t.Errorf("package %s: no matching scope found for %s", name, desc)
979 func TestInitOrderInfo(t *testing.T) {
980 var tests = []struct {
984 {`package p0; var (x = 1; y = x)`, []string{
987 {`package p1; var (a = 1; b = 2; c = 3)`, []string{
988 "a = 1", "b = 2", "c = 3",
990 {`package p2; var (a, b, c = 1, 2, 3)`, []string{
991 "a = 1", "b = 2", "c = 3",
993 {`package p3; var _ = f(); func f() int { return 1 }`, []string{
994 "_ = f()", // blank var
996 {`package p4; var (a = 0; x = y; y = z; z = 0)`, []string{
997 "a = 0", "z = 0", "y = z", "x = y",
999 {`package p5; var (a, _ = m[0]; m map[int]string)`, []string{
1000 "a, _ = m[0]", // blank var
1002 {`package p6; var a, b = f(); func f() (_, _ int) { return z, z }; var z = 0`, []string{
1003 "z = 0", "a, b = f()",
1005 {`package p7; var (a = func() int { return b }(); b = 1)`, []string{
1006 "b = 1", "a = func() int {…}()",
1008 {`package p8; var (a, b = func() (_, _ int) { return c, c }(); c = 1)`, []string{
1009 "c = 1", "a, b = func() (_, _ int) {…}()",
1011 {`package p9; type T struct{}; func (T) m() int { _ = y; return 0 }; var x, y = T.m, 1`, []string{
1014 {`package p10; var (d = c + b; a = 0; b = 0; c = 0)`, []string{
1015 "a = 0", "b = 0", "c = 0", "d = c + b",
1017 {`package p11; var (a = e + c; b = d + c; c = 0; d = 0; e = 0)`, []string{
1018 "c = 0", "d = 0", "b = d + c", "e = 0", "a = e + c",
1020 // emit an initializer for n:1 initializations only once (not for each node
1021 // on the lhs which may appear in different order in the dependency graph)
1022 {`package p12; var (a = x; b = 0; x, y = m[0]; m map[int]int)`, []string{
1023 "b = 0", "x, y = m[0]", "a = x",
1025 // test case from spec section on package initialization
1039 "d = 3", "b = f()", "c = f()", "a = c + b",
1041 // test case for issue 7131
1045 func next() int { counter++; return counter }
1048 func makeOrder() []int { return []int{f, b, d, e, c, a} }
1051 var b, c = next(), next()
1052 var d, e, f = next(), next(), next()
1054 "a = next()", "b = next()", "c = next()", "d = next()", "e = next()", "f = next()", "_ = makeOrder()",
1056 // test case for issue 10709
1066 func (T) m() int { return 0 }
1068 func makeT(n int) T {
1074 "t = makeT(0)", "v = t.m()",
1076 // test case for issue 10709: same as test before, but variable decls swapped
1086 func (T) m() int { return 0 }
1088 func makeT(n int) T {
1094 "t = makeT(0)", "v = t.m()",
1096 // another candidate possibly causing problems with issue 10709
1101 func f1() int { return g1() }
1102 func g1() int { f1(); return x1 }
1108 func f2() int { return g2() }
1109 func g2() int { return x2 }
1111 var x2 = 0`, []string{
1112 "x1 = 0", "y1 = f1()", "x2 = 0", "y2 = f2()",
1116 for _, test := range tests {
1118 name := mustTypecheck(t, "InitOrderInfo", test.src, &info)
1120 // number of initializers must match
1121 if len(info.InitOrder) != len(test.inits) {
1122 t.Errorf("package %s: got %d initializers; want %d", name, len(info.InitOrder), len(test.inits))
1126 // initializers must match
1127 for i, want := range test.inits {
1128 got := info.InitOrder[i].String()
1130 t.Errorf("package %s, init %d: got %s; want %s", name, i, got, want)
1137 func TestMultiFileInitOrder(t *testing.T) {
1138 mustParse := func(src string) *syntax.File {
1139 f, err := parseSrc("main", src)
1146 fileA := mustParse(`package main; var a = 1`)
1147 fileB := mustParse(`package main; var b = 2`)
1149 // The initialization order must not depend on the parse
1150 // order of the files, only on the presentation order to
1151 // the type-checker.
1152 for _, test := range []struct {
1153 files []*syntax.File
1156 {[]*syntax.File{fileA, fileB}, "[a = 1 b = 2]"},
1157 {[]*syntax.File{fileB, fileA}, "[b = 2 a = 1]"},
1160 if _, err := new(Config).Check("main", test.files, &info); err != nil {
1163 if got := fmt.Sprint(info.InitOrder); got != test.want {
1164 t.Fatalf("got %s; want %s", got, test.want)
1169 func TestFiles(t *testing.T) {
1170 var sources = []string{
1171 "package p; type T struct{}; func (T) m1() {}",
1172 "package p; func (T) m2() {}; var x interface{ m1(); m2() } = T{}",
1173 "package p; func (T) m3() {}; var y interface{ m1(); m2(); m3() } = T{}",
1178 pkg := NewPackage("p", "p")
1180 check := NewChecker(&conf, pkg, &info)
1182 for i, src := range sources {
1183 filename := fmt.Sprintf("sources%d", i)
1184 f, err := parseSrc(filename, src)
1188 if err := check.Files([]*syntax.File{f}); err != nil {
1193 // check InitOrder is [x y]
1195 for _, init := range info.InitOrder {
1196 for _, v := range init.Lhs {
1197 vars = append(vars, v.Name())
1200 if got, want := fmt.Sprint(vars), "[x y]"; got != want {
1201 t.Errorf("InitOrder == %s, want %s", got, want)
1205 type testImporter map[string]*Package
1207 func (m testImporter) Import(path string) (*Package, error) {
1208 if pkg := m[path]; pkg != nil {
1211 return nil, fmt.Errorf("package %q not found", path)
1214 func TestSelection(t *testing.T) {
1215 selections := make(map[*syntax.SelectorExpr]*Selection)
1217 imports := make(testImporter)
1218 conf := Config{Importer: imports}
1219 makePkg := func(path, src string) {
1220 f, err := parseSrc(path+".go", src)
1224 pkg, err := conf.Check(path, []*syntax.File{f}, &Info{Selections: selections})
1262 // qualified identifiers
1296 // method expressions
1303 wantOut := map[string][2]string{
1304 "lib.T.M": {"method expr (lib.T) M(lib.T)", ".[0]"},
1306 "A{}.B": {"field (main.A) B *main.B", ".[0]"},
1307 "new(A).B": {"field (*main.A) B *main.B", "->[0]"},
1308 "A{}.C": {"field (main.A) C main.C", ".[1]"},
1309 "new(A).C": {"field (*main.A) C main.C", "->[1]"},
1310 "A{}.b": {"field (main.A) b int", "->[0 0]"},
1311 "new(A).b": {"field (*main.A) b int", "->[0 0]"},
1312 "A{}.c": {"field (main.A) c int", ".[1 0]"},
1313 "new(A).c": {"field (*main.A) c int", "->[1 0]"},
1315 "A{}.f": {"method (main.A) f(int)", "->[0 0]"},
1316 "new(A).f": {"method (*main.A) f(int)", "->[0 0]"},
1317 "A{}.g": {"method (main.A) g()", ".[1 0]"},
1318 "new(A).g": {"method (*main.A) g()", "->[1 0]"},
1319 "new(A).h": {"method (*main.A) h()", "->[1 1]"}, // TODO(gri) should this report .[1 1] ?
1320 "B{}.f": {"method (main.B) f(int)", ".[0]"},
1321 "new(B).f": {"method (*main.B) f(int)", "->[0]"},
1322 "C{}.g": {"method (main.C) g()", ".[0]"},
1323 "new(C).g": {"method (*main.C) g()", "->[0]"},
1324 "new(C).h": {"method (*main.C) h()", "->[1]"}, // TODO(gri) should this report .[1] ?
1326 "A.f": {"method expr (main.A) f(main.A, int)", "->[0 0]"},
1327 "(*A).f": {"method expr (*main.A) f(*main.A, int)", "->[0 0]"},
1328 "B.f": {"method expr (main.B) f(main.B, int)", ".[0]"},
1329 "(*B).f": {"method expr (*main.B) f(*main.B, int)", "->[0]"},
1332 makePkg("lib", libSrc)
1333 makePkg("main", mainSrc)
1335 for e, sel := range selections {
1336 _ = sel.String() // assertion: must not panic
1338 start := indexFor(mainSrc, syntax.StartPos(e))
1339 end := indexFor(mainSrc, syntax.EndPos(e))
1340 segment := mainSrc[start:end] // (all SelectorExprs are in main, not lib)
1348 fmt.Sprintf("%s%v", direct, sel.Index()),
1350 want := wantOut[segment]
1352 t.Errorf("%s: got %q; want %q", segment, got, want)
1354 delete(wantOut, segment)
1356 // We must explicitly assert properties of the
1357 // Signature's receiver since it doesn't participate
1358 // in Identical() or String().
1359 sig, _ := sel.Type().(*Signature)
1360 if sel.Kind() == MethodVal {
1361 got := sig.Recv().Type()
1363 if !Identical(got, want) {
1364 t.Errorf("%s: Recv() = %s, want %s", segment, got, want)
1366 } else if sig != nil && sig.Recv() != nil {
1367 t.Errorf("%s: signature has receiver %s", sig, sig.Recv().Type())
1370 // Assert that all wantOut entries were used exactly once.
1371 for segment := range wantOut {
1372 t.Errorf("no syntax.Selection found with syntax %q", segment)
1376 // indexFor returns the index into s corresponding to the position pos.
1377 func indexFor(s string, pos syntax.Pos) int {
1378 i, line := 0, 1 // string index and corresponding line
1379 target := int(pos.Line())
1380 for line < target && i < len(s) {
1386 return i + int(pos.Col()-1) // columns are 1-based
1389 func TestIssue8518(t *testing.T) {
1390 imports := make(testImporter)
1392 Error: func(err error) { t.Log(err) }, // don't exit after first error
1395 makePkg := func(path, src string) {
1396 f, err := parseSrc(path, src)
1400 pkg, _ := conf.Check(path, []*syntax.File{f}, nil) // errors logged via conf.Error
1408 const C2 = missing.C
1418 makePkg("a", libSrc)
1419 makePkg("main", mainSrc) // don't crash when type-checking this package
1422 func TestLookupFieldOrMethod(t *testing.T) {
1423 // Test cases assume a lookup of the form a.f or x.f, where a stands for an
1424 // addressable value, and x for a non-addressable value (even though a variable
1425 // for ease of test case writing).
1426 var tests = []struct {
1433 {"var x T; type T struct{}", false, nil, false},
1434 {"var x T; type T struct{ f int }", true, []int{0}, false},
1435 {"var x T; type T struct{ a, b, f, c int }", true, []int{2}, false},
1438 {"var a T; type T struct{}; func (T) f() {}", true, []int{0}, false},
1439 {"var a *T; type T struct{}; func (T) f() {}", true, []int{0}, true},
1440 {"var a T; type T struct{}; func (*T) f() {}", true, []int{0}, false},
1441 {"var a *T; type T struct{}; func (*T) f() {}", true, []int{0}, true}, // TODO(gri) should this report indirect = false?
1444 {"type ( E1 struct{ f int }; E2 struct{ f int }; x struct{ E1; *E2 })", false, []int{1, 0}, false},
1445 {"type ( E1 struct{ f int }; E2 struct{}; x struct{ E1; *E2 }); func (E2) f() {}", false, []int{1, 0}, false},
1447 // outside methodset
1448 // (*T).f method exists, but value of type T is not addressable
1449 {"var x T; type T struct{}; func (*T) f() {}", false, nil, true},
1452 for _, test := range tests {
1453 pkg, err := pkgFor("test", "package p;"+test.src, nil)
1455 t.Errorf("%s: incorrect test case: %s", test.src, err)
1459 obj := pkg.Scope().Lookup("a")
1461 if obj = pkg.Scope().Lookup("x"); obj == nil {
1462 t.Errorf("%s: incorrect test case - no object a or x", test.src)
1467 f, index, indirect := LookupFieldOrMethod(obj.Type(), obj.Name() == "a", pkg, "f")
1468 if (f != nil) != test.found {
1470 t.Errorf("%s: got no object; want one", test.src)
1472 t.Errorf("%s: got object = %v; want none", test.src, f)
1475 if !sameSlice(index, test.index) {
1476 t.Errorf("%s: got index = %v; want %v", test.src, index, test.index)
1478 if indirect != test.indirect {
1479 t.Errorf("%s: got indirect = %v; want %v", test.src, indirect, test.indirect)
1484 func sameSlice(a, b []int) bool {
1485 if len(a) != len(b) {
1488 for i, x := range a {
1496 // TestScopeLookupParent ensures that (*Scope).LookupParent returns
1497 // the correct result at various positions within the source.
1498 func TestScopeLookupParent(t *testing.T) {
1499 imports := make(testImporter)
1500 conf := Config{Importer: imports}
1502 makePkg := func(path, src string) {
1503 f, err := parseSrc(path, src)
1507 imports[path], err = conf.Check(path, []*syntax.File{f}, &info)
1513 makePkg("lib", "package lib; var X int")
1514 // Each /*name=kind:line*/ comment makes the test look up the
1515 // name at that point and checks that it resolves to a decl of
1516 // the specified kind and line number. "undef" means undefined.
1518 /*lib=pkgname:5*/ /*X=var:1*/ /*Pi=const:8*/ /*T=typename:9*/ /*Y=var:10*/ /*F=func:12*/
1529 const pi, e = 3.1415, /*pi=undef*/ 2.71828 /*pi=const:13*/ /*e=const:13*/
1530 type /*t=undef*/ t /*t=typename:14*/ *t
1531 print(Y) /*Y=var:10*/
1532 x, Y := Y, /*x=undef*/ /*Y=var:10*/ Pi /*x=var:16*/ /*Y=var:16*/ ; _ = x; _ = Y
1533 var F = /*F=func:12*/ F /*F=var:17*/ ; _ = F
1536 for i, x := range /*i=undef*/ /*x=var:16*/ a /*i=var:20*/ /*x=var:20*/ { _ = i; _ = x }
1539 switch y := i.(type) { /*y=undef*/
1540 case /*y=undef*/ int /*y=var:23*/ :
1541 case float32, /*y=undef*/ float64 /*y=var:23*/ :
1542 default /*y=var:23*/:
1547 switch int := i.(type) {
1548 case /*int=typename:0*/ int /*int=var:31*/ :
1550 default /*int=var:31*/ :
1556 info.Uses = make(map[*syntax.Name]Object)
1557 makePkg("main", mainSrc)
1558 mainScope := imports["main"].Scope()
1560 rx := regexp.MustCompile(`^/\*(\w*)=([\w:]*)\*/$`)
1562 base := syntax.NewFileBase("main")
1563 syntax.CommentsDo(strings.NewReader(mainSrc), func(line, col uint, text string) {
1564 pos := syntax.MakePos(base, line, col)
1566 // Syntax errors are not comments.
1568 t.Errorf("%s: %s", pos, text)
1572 // Parse the assertion in the comment.
1573 m := rx.FindStringSubmatch(text)
1575 t.Errorf("%s: bad comment: %s", pos, text)
1578 name, want := m[1], m[2]
1580 // Look up the name in the innermost enclosing scope.
1581 inner := mainScope.Innermost(pos)
1583 t.Errorf("%s: at %s: can't find innermost scope", pos, text)
1587 if _, obj := inner.LookupParent(name, pos); obj != nil {
1588 kind := strings.ToLower(strings.TrimPrefix(reflect.TypeOf(obj).String(), "*types2."))
1589 got = fmt.Sprintf("%s:%d", kind, obj.Pos().Line())
1592 t.Errorf("%s: at %s: %s resolved to %s, want %s", pos, text, name, got, want)
1596 // Check that for each referring identifier,
1597 // a lookup of its name on the innermost
1598 // enclosing scope returns the correct object.
1600 for id, wantObj := range info.Uses {
1601 inner := mainScope.Innermost(id.Pos())
1603 t.Errorf("%s: can't find innermost scope enclosing %q", id.Pos(), id.Value)
1607 // Exclude selectors and qualified identifiers---lexical
1608 // refs only. (Ideally, we'd see if the AST parent is a
1609 // SelectorExpr, but that requires PathEnclosingInterval
1610 // from golang.org/x/tools/go/ast/astutil.)
1611 if id.Value == "X" {
1615 _, gotObj := inner.LookupParent(id.Value, id.Pos())
1616 if gotObj != wantObj {
1617 t.Errorf("%s: got %v, want %v", id.Pos(), gotObj, wantObj)
1623 var nopos syntax.Pos
1625 // newDefined creates a new defined type named T with the given underlying type.
1626 func newDefined(underlying Type) *Named {
1627 tname := NewTypeName(nopos, nil, "T", nil)
1628 return NewNamed(tname, underlying, nil)
1631 func TestConvertibleTo(t *testing.T) {
1632 for _, test := range []struct {
1636 {Typ[Int], Typ[Int], true},
1637 {Typ[Int], Typ[Float32], true},
1638 {Typ[Int], Typ[String], true},
1639 {newDefined(Typ[Int]), Typ[Int], true},
1640 {newDefined(new(Struct)), new(Struct), true},
1641 {newDefined(Typ[Int]), new(Struct), false},
1642 {Typ[UntypedInt], Typ[Int], true},
1643 {NewSlice(Typ[Int]), NewPointer(NewArray(Typ[Int], 10)), true},
1644 {NewSlice(Typ[Int]), NewArray(Typ[Int], 10), false},
1645 {NewSlice(Typ[Int]), NewPointer(NewArray(Typ[Uint], 10)), false},
1646 // Untyped string values are not permitted by the spec, so the behavior below is undefined.
1647 {Typ[UntypedString], Typ[String], true},
1649 if got := ConvertibleTo(test.v, test.t); got != test.want {
1650 t.Errorf("ConvertibleTo(%v, %v) = %t, want %t", test.v, test.t, got, test.want)
1655 func TestAssignableTo(t *testing.T) {
1656 for _, test := range []struct {
1660 {Typ[Int], Typ[Int], true},
1661 {Typ[Int], Typ[Float32], false},
1662 {newDefined(Typ[Int]), Typ[Int], false},
1663 {newDefined(new(Struct)), new(Struct), true},
1664 {Typ[UntypedBool], Typ[Bool], true},
1665 {Typ[UntypedString], Typ[Bool], false},
1666 // Neither untyped string nor untyped numeric assignments arise during
1667 // normal type checking, so the below behavior is technically undefined by
1669 {Typ[UntypedString], Typ[String], true},
1670 {Typ[UntypedInt], Typ[Int], true},
1672 if got := AssignableTo(test.v, test.t); got != test.want {
1673 t.Errorf("AssignableTo(%v, %v) = %t, want %t", test.v, test.t, got, test.want)
1678 func TestIdentical_issue15173(t *testing.T) {
1679 // Identical should allow nil arguments and be symmetric.
1680 for _, test := range []struct {
1684 {Typ[Int], Typ[Int], true},
1685 {Typ[Int], nil, false},
1686 {nil, Typ[Int], false},
1689 if got := Identical(test.x, test.y); got != test.want {
1690 t.Errorf("Identical(%v, %v) = %t", test.x, test.y, got)
1695 func TestIdenticalUnions(t *testing.T) {
1696 tname := NewTypeName(nopos, nil, "myInt", nil)
1697 myInt := NewNamed(tname, Typ[Int], nil)
1698 tmap := map[string]*Term{
1699 "int": NewTerm(false, Typ[Int]),
1700 "~int": NewTerm(true, Typ[Int]),
1701 "string": NewTerm(false, Typ[String]),
1702 "~string": NewTerm(true, Typ[String]),
1703 "myInt": NewTerm(false, myInt),
1705 makeUnion := func(s string) *Union {
1706 parts := strings.Split(s, "|")
1708 for _, p := range parts {
1711 t.Fatalf("missing term %q", p)
1713 terms = append(terms, term)
1715 return NewUnion(terms)
1717 for _, test := range []struct {
1721 // These tests are just sanity checks. The tests for type sets and
1722 // interfaces provide much more test coverage.
1723 {"int|~int", "~int", true},
1724 {"myInt|~int", "~int", true},
1725 {"int|string", "string|int", true},
1726 {"int|int|string", "string|int", true},
1727 {"myInt|string", "int|string", false},
1729 x := makeUnion(test.x)
1730 y := makeUnion(test.y)
1731 if got := Identical(x, y); got != test.want {
1732 t.Errorf("Identical(%v, %v) = %t", test.x, test.y, got)
1737 func TestIssue15305(t *testing.T) {
1738 const src = "package p; func f() int16; var _ = f(undef)"
1739 f, err := parseSrc("issue15305.go", src)
1744 Error: func(err error) {}, // allow errors
1747 Types: make(map[syntax.Expr]TypeAndValue),
1749 conf.Check("p", []*syntax.File{f}, info) // ignore result
1750 for e, tv := range info.Types {
1751 if _, ok := e.(*syntax.CallExpr); ok {
1752 if tv.Type != Typ[Int16] {
1753 t.Errorf("CallExpr has type %v, want int16", tv.Type)
1758 t.Errorf("CallExpr has no type")
1761 // TestCompositeLitTypes verifies that Info.Types registers the correct
1762 // types for composite literal expressions and composite literal type
1764 func TestCompositeLitTypes(t *testing.T) {
1765 for _, test := range []struct {
1768 {`[16]byte{}`, `[16]byte`},
1769 {`[...]byte{}`, `[0]byte`}, // test for issue #14092
1770 {`[...]int{1, 2, 3}`, `[3]int`}, // test for issue #14092
1771 {`[...]int{90: 0, 98: 1, 2}`, `[100]int`}, // test for issue #14092
1772 {`[]int{}`, `[]int`},
1773 {`map[string]bool{"foo": true}`, `map[string]bool`},
1774 {`struct{}{}`, `struct{}`},
1775 {`struct{x, y int; z complex128}{}`, `struct{x int; y int; z complex128}`},
1777 f, err := parseSrc(test.lit, "package p; var _ = "+test.lit)
1779 t.Fatalf("%s: %v", test.lit, err)
1783 Types: make(map[syntax.Expr]TypeAndValue),
1785 if _, err = new(Config).Check("p", []*syntax.File{f}, info); err != nil {
1786 t.Fatalf("%s: %v", test.lit, err)
1789 cmptype := func(x syntax.Expr, want string) {
1790 tv, ok := info.Types[x]
1792 t.Errorf("%s: no Types entry found", test.lit)
1796 t.Errorf("%s: type is nil", test.lit)
1799 if got := tv.Type.String(); got != want {
1800 t.Errorf("%s: got %v, want %s", test.lit, got, want)
1804 // test type of composite literal expression
1805 rhs := f.DeclList[0].(*syntax.VarDecl).Values
1806 cmptype(rhs, test.typ)
1808 // test type of composite literal type expression
1809 cmptype(rhs.(*syntax.CompositeLit).Type, test.typ)
1813 // TestObjectParents verifies that objects have parent scopes or not
1814 // as specified by the Object interface.
1815 func TestObjectParents(t *testing.T) {
1834 func f(x int) { y := x; print(y) }
1837 f, err := parseSrc("src", src)
1843 Defs: make(map[*syntax.Name]Object),
1845 if _, err = new(Config).Check("p", []*syntax.File{f}, info); err != nil {
1849 for ident, obj := range info.Defs {
1851 // only package names and implicit vars have a nil object
1852 // (in this test we only need to handle the package name)
1853 if ident.Value != "p" {
1854 t.Errorf("%v has nil object", ident)
1859 // struct fields, type-associated and interface methods
1860 // have no parent scope
1862 switch obj := obj.(type) {
1868 if obj.Type().(*Signature).Recv() != nil { // method
1873 gotParent := obj.Parent() != nil
1875 case gotParent && !wantParent:
1876 t.Errorf("%v: want no parent, got %s", ident, obj.Parent())
1877 case !gotParent && wantParent:
1878 t.Errorf("%v: no parent found", ident)
1883 // TestFailedImport tests that we don't get follow-on errors
1884 // elsewhere in a package due to failing to import a package.
1885 func TestFailedImport(t *testing.T) {
1886 testenv.MustHaveGoBuild(t)
1891 import foo "go/types/thisdirectorymustnotexistotherwisethistestmayfail/foo" // should only see an error here
1896 func f(x T) T { return foo.F(x) }
1898 f, err := parseSrc("src", src)
1902 files := []*syntax.File{f}
1904 // type-check using all possible importers
1905 for _, compiler := range []string{"gc", "gccgo", "source"} {
1908 Error: func(err error) {
1909 // we should only see the import error
1910 if errcount > 0 || !strings.Contains(err.Error(), "could not import") {
1911 t.Errorf("for %s importer, got unexpected error: %v", compiler, err)
1915 //Importer: importer.For(compiler, nil),
1919 Uses: make(map[*syntax.Name]Object),
1921 pkg, _ := conf.Check("p", files, info)
1923 t.Errorf("for %s importer, type-checking failed to return a package", compiler)
1927 imports := pkg.Imports()
1928 if len(imports) != 1 {
1929 t.Errorf("for %s importer, got %d imports, want 1", compiler, len(imports))
1933 if imp.Name() != "foo" {
1934 t.Errorf(`for %s importer, got %q, want "foo"`, compiler, imp.Name())
1938 // verify that all uses of foo refer to the imported package foo (imp)
1939 for ident, obj := range info.Uses {
1940 if ident.Value == "foo" {
1941 if obj, ok := obj.(*PkgName); ok {
1942 if obj.Imported() != imp {
1943 t.Errorf("%s resolved to %v; want %v", ident.Value, obj.Imported(), imp)
1946 t.Errorf("%s resolved to %v; want package name", ident.Value, obj)
1953 func TestInstantiate(t *testing.T) {
1954 // eventually we like more tests but this is a start
1955 const src = "package p; type T[P any] *T[P]"
1956 pkg, err := pkgFor(".", src, nil)
1961 // type T should have one type parameter
1962 T := pkg.Scope().Lookup("T").Type().(*Named)
1963 if n := T.TypeParams().Len(); n != 1 {
1964 t.Fatalf("expected 1 type parameter; found %d", n)
1967 // instantiation should succeed (no endless recursion)
1968 // even with a nil *Checker
1969 res, err := Instantiate(nil, T, []Type{Typ[Int]}, false)
1974 // instantiated type should point to itself
1975 if p := res.Underlying().(*Pointer).Elem(); p != res {
1976 t.Fatalf("unexpected result type: %s points to %s", res, p)
1980 func TestInstantiateErrors(t *testing.T) {
1982 src string // by convention, T must be the type being instantiated
1984 wantAt int // -1 indicates no error
1986 {"type T[P interface{~string}] int", []Type{Typ[Int]}, 0},
1987 {"type T[P1 interface{int}, P2 interface{~string}] int", []Type{Typ[Int], Typ[Int]}, 1},
1988 {"type T[P1 any, P2 interface{~[]P1}] int", []Type{Typ[Int], NewSlice(Typ[String])}, 1},
1989 {"type T[P1 interface{~[]P2}, P2 any] int", []Type{NewSlice(Typ[String]), Typ[Int]}, 0},
1992 for _, test := range tests {
1993 src := "package p; " + test.src
1994 pkg, err := pkgFor(".", src, nil)
1999 T := pkg.Scope().Lookup("T").Type().(*Named)
2001 _, err = Instantiate(nil, T, test.targs, true)
2003 t.Fatalf("Instantiate(%v, %v) returned nil error, want non-nil", T, test.targs)
2006 var argErr *ArgumentError
2007 if !errors.As(err, &argErr) {
2008 t.Fatalf("Instantiate(%v, %v): error is not an *ArgumentError", T, test.targs)
2011 if argErr.Index != test.wantAt {
2012 t.Errorf("Instantate(%v, %v): error at index %d, want index %d", T, test.targs, argErr.Index, test.wantAt)
2017 func TestInstanceIdentity(t *testing.T) {
2018 imports := make(testImporter)
2019 conf := Config{Importer: imports}
2020 makePkg := func(src string) {
2021 f, err := parseSrc("", src)
2025 name := f.PkgName.Value
2026 pkg, err := conf.Check(name, []*syntax.File{f}, nil)
2032 makePkg(`package lib; type T[P any] struct{}`)
2033 makePkg(`package a; import "lib"; var A lib.T[int]`)
2034 makePkg(`package b; import "lib"; var B lib.T[int]`)
2035 a := imports["a"].Scope().Lookup("A")
2036 b := imports["b"].Scope().Lookup("B")
2037 if !Identical(a.Type(), b.Type()) {
2038 t.Errorf("mismatching types: a.A: %s, b.B: %s", a.Type(), b.Type())