| // Copyright 2013 The Go Authors. All rights reserved. |
| // Use of this source code is governed by a BSD-style |
| // license that can be found in the LICENSE file. |
| |
| package types_test |
| |
| import ( |
| "bytes" |
| "fmt" |
| "go/ast" |
| "go/importer" |
| "go/internal/typeparams" |
| "go/parser" |
| "go/token" |
| "internal/testenv" |
| "reflect" |
| "regexp" |
| "strings" |
| "testing" |
| |
| . "go/types" |
| ) |
| |
| // pkgFor parses and type checks the package specified by path and source, |
| // populating info if provided. |
| // |
| // If source begins with "package generic_" and type parameters are enabled, |
| // generic code is permitted. |
| func pkgFor(path, source string, info *Info) (*Package, error) { |
| fset := token.NewFileSet() |
| mode := modeForSource(source) |
| f, err := parser.ParseFile(fset, path, source, mode) |
| if err != nil { |
| return nil, err |
| } |
| conf := Config{Importer: importer.Default()} |
| return conf.Check(f.Name.Name, fset, []*ast.File{f}, info) |
| } |
| |
| func mustTypecheck(t *testing.T, path, source string, info *Info) string { |
| t.Skip("skipping for gccgo--no importer") |
| pkg, err := pkgFor(path, source, info) |
| if err != nil { |
| name := path |
| if pkg != nil { |
| name = "package " + pkg.Name() |
| } |
| t.Fatalf("%s: didn't type-check (%s)", name, err) |
| } |
| return pkg.Name() |
| } |
| |
| // genericPkg is a prefix for packages that should be type checked with |
| // generics. |
| const genericPkg = "package generic_" |
| |
| func modeForSource(src string) parser.Mode { |
| if !strings.HasPrefix(src, genericPkg) { |
| return typeparams.DisallowParsing |
| } |
| return 0 |
| } |
| |
| func mayTypecheck(t *testing.T, path, source string, info *Info) (string, error) { |
| fset := token.NewFileSet() |
| mode := modeForSource(source) |
| f, err := parser.ParseFile(fset, path, source, mode) |
| if f == nil { // ignore errors unless f is nil |
| t.Fatalf("%s: unable to parse: %s", path, err) |
| } |
| conf := Config{ |
| Error: func(err error) {}, |
| Importer: importer.Default(), |
| } |
| pkg, err := conf.Check(f.Name.Name, fset, []*ast.File{f}, info) |
| return pkg.Name(), err |
| } |
| |
| func TestValuesInfo(t *testing.T) { |
| var tests = []struct { |
| src string |
| expr string // constant expression |
| typ string // constant type |
| val string // constant value |
| }{ |
| {`package a0; const _ = false`, `false`, `untyped bool`, `false`}, |
| {`package a1; const _ = 0`, `0`, `untyped int`, `0`}, |
| {`package a2; const _ = 'A'`, `'A'`, `untyped rune`, `65`}, |
| {`package a3; const _ = 0.`, `0.`, `untyped float`, `0`}, |
| {`package a4; const _ = 0i`, `0i`, `untyped complex`, `(0 + 0i)`}, |
| {`package a5; const _ = "foo"`, `"foo"`, `untyped string`, `"foo"`}, |
| |
| {`package b0; var _ = false`, `false`, `bool`, `false`}, |
| {`package b1; var _ = 0`, `0`, `int`, `0`}, |
| {`package b2; var _ = 'A'`, `'A'`, `rune`, `65`}, |
| {`package b3; var _ = 0.`, `0.`, `float64`, `0`}, |
| {`package b4; var _ = 0i`, `0i`, `complex128`, `(0 + 0i)`}, |
| {`package b5; var _ = "foo"`, `"foo"`, `string`, `"foo"`}, |
| |
| {`package c0a; var _ = bool(false)`, `false`, `bool`, `false`}, |
| {`package c0b; var _ = bool(false)`, `bool(false)`, `bool`, `false`}, |
| {`package c0c; type T bool; var _ = T(false)`, `T(false)`, `c0c.T`, `false`}, |
| |
| {`package c1a; var _ = int(0)`, `0`, `int`, `0`}, |
| {`package c1b; var _ = int(0)`, `int(0)`, `int`, `0`}, |
| {`package c1c; type T int; var _ = T(0)`, `T(0)`, `c1c.T`, `0`}, |
| |
| {`package c2a; var _ = rune('A')`, `'A'`, `rune`, `65`}, |
| {`package c2b; var _ = rune('A')`, `rune('A')`, `rune`, `65`}, |
| {`package c2c; type T rune; var _ = T('A')`, `T('A')`, `c2c.T`, `65`}, |
| |
| {`package c3a; var _ = float32(0.)`, `0.`, `float32`, `0`}, |
| {`package c3b; var _ = float32(0.)`, `float32(0.)`, `float32`, `0`}, |
| {`package c3c; type T float32; var _ = T(0.)`, `T(0.)`, `c3c.T`, `0`}, |
| |
| {`package c4a; var _ = complex64(0i)`, `0i`, `complex64`, `(0 + 0i)`}, |
| {`package c4b; var _ = complex64(0i)`, `complex64(0i)`, `complex64`, `(0 + 0i)`}, |
| {`package c4c; type T complex64; var _ = T(0i)`, `T(0i)`, `c4c.T`, `(0 + 0i)`}, |
| |
| {`package c5a; var _ = string("foo")`, `"foo"`, `string`, `"foo"`}, |
| {`package c5b; var _ = string("foo")`, `string("foo")`, `string`, `"foo"`}, |
| {`package c5c; type T string; var _ = T("foo")`, `T("foo")`, `c5c.T`, `"foo"`}, |
| {`package c5d; var _ = string(65)`, `65`, `untyped int`, `65`}, |
| {`package c5e; var _ = string('A')`, `'A'`, `untyped rune`, `65`}, |
| {`package c5f; type T string; var _ = T('A')`, `'A'`, `untyped rune`, `65`}, |
| {`package c5g; var s uint; var _ = string(1 << s)`, `1 << s`, `untyped int`, ``}, |
| |
| {`package d0; var _ = []byte("foo")`, `"foo"`, `string`, `"foo"`}, |
| {`package d1; var _ = []byte(string("foo"))`, `"foo"`, `string`, `"foo"`}, |
| {`package d2; var _ = []byte(string("foo"))`, `string("foo")`, `string`, `"foo"`}, |
| {`package d3; type T []byte; var _ = T("foo")`, `"foo"`, `string`, `"foo"`}, |
| |
| {`package e0; const _ = float32( 1e-200)`, `float32(1e-200)`, `float32`, `0`}, |
| {`package e1; const _ = float32(-1e-200)`, `float32(-1e-200)`, `float32`, `0`}, |
| {`package e2; const _ = float64( 1e-2000)`, `float64(1e-2000)`, `float64`, `0`}, |
| {`package e3; const _ = float64(-1e-2000)`, `float64(-1e-2000)`, `float64`, `0`}, |
| {`package e4; const _ = complex64( 1e-200)`, `complex64(1e-200)`, `complex64`, `(0 + 0i)`}, |
| {`package e5; const _ = complex64(-1e-200)`, `complex64(-1e-200)`, `complex64`, `(0 + 0i)`}, |
| {`package e6; const _ = complex128( 1e-2000)`, `complex128(1e-2000)`, `complex128`, `(0 + 0i)`}, |
| {`package e7; const _ = complex128(-1e-2000)`, `complex128(-1e-2000)`, `complex128`, `(0 + 0i)`}, |
| |
| {`package f0 ; var _ float32 = 1e-200`, `1e-200`, `float32`, `0`}, |
| {`package f1 ; var _ float32 = -1e-200`, `-1e-200`, `float32`, `0`}, |
| {`package f2a; var _ float64 = 1e-2000`, `1e-2000`, `float64`, `0`}, |
| {`package f3a; var _ float64 = -1e-2000`, `-1e-2000`, `float64`, `0`}, |
| {`package f2b; var _ = 1e-2000`, `1e-2000`, `float64`, `0`}, |
| {`package f3b; var _ = -1e-2000`, `-1e-2000`, `float64`, `0`}, |
| {`package f4 ; var _ complex64 = 1e-200 `, `1e-200`, `complex64`, `(0 + 0i)`}, |
| {`package f5 ; var _ complex64 = -1e-200 `, `-1e-200`, `complex64`, `(0 + 0i)`}, |
| {`package f6a; var _ complex128 = 1e-2000i`, `1e-2000i`, `complex128`, `(0 + 0i)`}, |
| {`package f7a; var _ complex128 = -1e-2000i`, `-1e-2000i`, `complex128`, `(0 + 0i)`}, |
| {`package f6b; var _ = 1e-2000i`, `1e-2000i`, `complex128`, `(0 + 0i)`}, |
| {`package f7b; var _ = -1e-2000i`, `-1e-2000i`, `complex128`, `(0 + 0i)`}, |
| |
| {`package g0; const (a = len([iota]int{}); b; c); const _ = c`, `c`, `int`, `2`}, // issue #22341 |
| } |
| |
| for _, test := range tests { |
| info := Info{ |
| Types: make(map[ast.Expr]TypeAndValue), |
| } |
| name := mustTypecheck(t, "ValuesInfo", test.src, &info) |
| |
| // look for expression |
| var expr ast.Expr |
| for e := range info.Types { |
| if ExprString(e) == test.expr { |
| expr = e |
| break |
| } |
| } |
| if expr == nil { |
| t.Errorf("package %s: no expression found for %s", name, test.expr) |
| continue |
| } |
| tv := info.Types[expr] |
| |
| // check that type is correct |
| if got := tv.Type.String(); got != test.typ { |
| t.Errorf("package %s: got type %s; want %s", name, got, test.typ) |
| continue |
| } |
| |
| // if we have a constant, check that value is correct |
| if tv.Value != nil { |
| if got := tv.Value.ExactString(); got != test.val { |
| t.Errorf("package %s: got value %s; want %s", name, got, test.val) |
| } |
| } else { |
| if test.val != "" { |
| t.Errorf("package %s: no constant found; want %s", name, test.val) |
| } |
| } |
| } |
| } |
| |
| func TestTypesInfo(t *testing.T) { |
| // Test sources that are not expected to typecheck must start with the broken prefix. |
| const broken = "package broken_" |
| |
| var tests = []struct { |
| src string |
| expr string // expression |
| typ string // value type |
| }{ |
| // single-valued expressions of untyped constants |
| {`package b0; var x interface{} = false`, `false`, `bool`}, |
| {`package b1; var x interface{} = 0`, `0`, `int`}, |
| {`package b2; var x interface{} = 0.`, `0.`, `float64`}, |
| {`package b3; var x interface{} = 0i`, `0i`, `complex128`}, |
| {`package b4; var x interface{} = "foo"`, `"foo"`, `string`}, |
| |
| // uses of nil |
| {`package n0; var _ *int = nil`, `nil`, `untyped nil`}, |
| {`package n1; var _ func() = nil`, `nil`, `untyped nil`}, |
| {`package n2; var _ []byte = nil`, `nil`, `untyped nil`}, |
| {`package n3; var _ map[int]int = nil`, `nil`, `untyped nil`}, |
| {`package n4; var _ chan int = nil`, `nil`, `untyped nil`}, |
| {`package n5; var _ interface{} = nil`, `nil`, `untyped nil`}, |
| {`package n6; import "unsafe"; var _ unsafe.Pointer = nil`, `nil`, `untyped nil`}, |
| |
| {`package n10; var (x *int; _ = x == nil)`, `nil`, `untyped nil`}, |
| {`package n11; var (x func(); _ = x == nil)`, `nil`, `untyped nil`}, |
| {`package n12; var (x []byte; _ = x == nil)`, `nil`, `untyped nil`}, |
| {`package n13; var (x map[int]int; _ = x == nil)`, `nil`, `untyped nil`}, |
| {`package n14; var (x chan int; _ = x == nil)`, `nil`, `untyped nil`}, |
| {`package n15; var (x interface{}; _ = x == nil)`, `nil`, `untyped nil`}, |
| {`package n15; import "unsafe"; var (x unsafe.Pointer; _ = x == nil)`, `nil`, `untyped nil`}, |
| |
| {`package n20; var _ = (*int)(nil)`, `nil`, `untyped nil`}, |
| {`package n21; var _ = (func())(nil)`, `nil`, `untyped nil`}, |
| {`package n22; var _ = ([]byte)(nil)`, `nil`, `untyped nil`}, |
| {`package n23; var _ = (map[int]int)(nil)`, `nil`, `untyped nil`}, |
| {`package n24; var _ = (chan int)(nil)`, `nil`, `untyped nil`}, |
| {`package n25; var _ = (interface{})(nil)`, `nil`, `untyped nil`}, |
| {`package n26; import "unsafe"; var _ = unsafe.Pointer(nil)`, `nil`, `untyped nil`}, |
| |
| {`package n30; func f(*int) { f(nil) }`, `nil`, `untyped nil`}, |
| {`package n31; func f(func()) { f(nil) }`, `nil`, `untyped nil`}, |
| {`package n32; func f([]byte) { f(nil) }`, `nil`, `untyped nil`}, |
| {`package n33; func f(map[int]int) { f(nil) }`, `nil`, `untyped nil`}, |
| {`package n34; func f(chan int) { f(nil) }`, `nil`, `untyped nil`}, |
| {`package n35; func f(interface{}) { f(nil) }`, `nil`, `untyped nil`}, |
| {`package n35; import "unsafe"; func f(unsafe.Pointer) { f(nil) }`, `nil`, `untyped nil`}, |
| |
| // comma-ok expressions |
| {`package p0; var x interface{}; var _, _ = x.(int)`, |
| `x.(int)`, |
| `(int, bool)`, |
| }, |
| {`package p1; var x interface{}; func _() { _, _ = x.(int) }`, |
| `x.(int)`, |
| `(int, bool)`, |
| }, |
| {`package p2a; type mybool bool; var m map[string]complex128; var b mybool; func _() { _, b = m["foo"] }`, |
| `m["foo"]`, |
| `(complex128, p2a.mybool)`, |
| }, |
| {`package p2b; var m map[string]complex128; var b bool; func _() { _, b = m["foo"] }`, |
| `m["foo"]`, |
| `(complex128, bool)`, |
| }, |
| {`package p3; var c chan string; var _, _ = <-c`, |
| `<-c`, |
| `(string, bool)`, |
| }, |
| |
| // issue 6796 |
| {`package issue6796_a; var x interface{}; var _, _ = (x.(int))`, |
| `x.(int)`, |
| `(int, bool)`, |
| }, |
| {`package issue6796_b; var c chan string; var _, _ = (<-c)`, |
| `(<-c)`, |
| `(string, bool)`, |
| }, |
| {`package issue6796_c; var c chan string; var _, _ = (<-c)`, |
| `<-c`, |
| `(string, bool)`, |
| }, |
| {`package issue6796_d; var c chan string; var _, _ = ((<-c))`, |
| `(<-c)`, |
| `(string, bool)`, |
| }, |
| {`package issue6796_e; func f(c chan string) { _, _ = ((<-c)) }`, |
| `(<-c)`, |
| `(string, bool)`, |
| }, |
| |
| // issue 7060 |
| {`package issue7060_a; var ( m map[int]string; x, ok = m[0] )`, |
| `m[0]`, |
| `(string, bool)`, |
| }, |
| {`package issue7060_b; var ( m map[int]string; x, ok interface{} = m[0] )`, |
| `m[0]`, |
| `(string, bool)`, |
| }, |
| {`package issue7060_c; func f(x interface{}, ok bool, m map[int]string) { x, ok = m[0] }`, |
| `m[0]`, |
| `(string, bool)`, |
| }, |
| {`package issue7060_d; var ( ch chan string; x, ok = <-ch )`, |
| `<-ch`, |
| `(string, bool)`, |
| }, |
| {`package issue7060_e; var ( ch chan string; x, ok interface{} = <-ch )`, |
| `<-ch`, |
| `(string, bool)`, |
| }, |
| {`package issue7060_f; func f(x interface{}, ok bool, ch chan string) { x, ok = <-ch }`, |
| `<-ch`, |
| `(string, bool)`, |
| }, |
| |
| // issue 28277 |
| {`package issue28277_a; func f(...int)`, |
| `...int`, |
| `[]int`, |
| }, |
| {`package issue28277_b; func f(a, b int, c ...[]struct{})`, |
| `...[]struct{}`, |
| `[][]struct{}`, |
| }, |
| |
| // issue 47243 |
| {`package issue47243_a; var x int32; var _ = x << 3`, `3`, `untyped int`}, |
| {`package issue47243_b; var x int32; var _ = x << 3.`, `3.`, `uint`}, // issue 47410: should be untyped float |
| {`package issue47243_c; var x int32; var _ = 1 << x`, `1 << x`, `int`}, |
| {`package issue47243_d; var x int32; var _ = 1 << x`, `1`, `int`}, |
| {`package issue47243_e; var x int32; var _ = 1 << 2`, `1`, `untyped int`}, |
| {`package issue47243_f; var x int32; var _ = 1 << 2`, `2`, `untyped int`}, |
| {`package issue47243_g; var x int32; var _ = int(1) << 2`, `2`, `untyped int`}, |
| {`package issue47243_h; var x int32; var _ = 1 << (2 << x)`, `1`, `int`}, |
| {`package issue47243_i; var x int32; var _ = 1 << (2 << x)`, `(2 << x)`, `untyped int`}, |
| {`package issue47243_j; var x int32; var _ = 1 << (2 << x)`, `2`, `untyped int`}, |
| |
| // tests for broken code that doesn't parse or type-check |
| {broken + `x0; func _() { var x struct {f string}; x.f := 0 }`, `x.f`, `string`}, |
| {broken + `x1; func _() { var z string; type x struct {f string}; y := &x{q: z}}`, `z`, `string`}, |
| {broken + `x2; func _() { var a, b string; type x struct {f string}; z := &x{f: a; f: b;}}`, `b`, `string`}, |
| {broken + `x3; var x = panic("");`, `panic`, `func(interface{})`}, |
| {`package x4; func _() { panic("") }`, `panic`, `func(interface{})`}, |
| {broken + `x5; func _() { var x map[string][...]int; x = map[string][...]int{"": {1,2,3}} }`, `x`, `map[string][-1]int`}, |
| |
| // parameterized functions |
| {genericPkg + `p0; func f[T any](T); var _ = f[int]`, `f`, `func[T₁ interface{}](T₁)`}, |
| {genericPkg + `p1; func f[T any](T); var _ = f[int]`, `f[int]`, `func(int)`}, |
| {genericPkg + `p2; func f[T any](T); func _() { f(42) }`, `f`, `func[T₁ interface{}](T₁)`}, |
| {genericPkg + `p3; func f[T any](T); func _() { f(42) }`, `f(42)`, `()`}, |
| |
| // type parameters |
| {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 |
| {genericPkg + `t1; type t[P any] int; var _ t[int]`, `t`, `generic_t1.t[P₁ interface{}]`}, |
| {genericPkg + `t2; type t[P interface{}] int; var _ t[int]`, `t`, `generic_t2.t[P₁ interface{}]`}, |
| {genericPkg + `t3; type t[P, Q interface{}] int; var _ t[int, int]`, `t`, `generic_t3.t[P₁, Q₂ interface{}]`}, |
| |
| // TODO (rFindley): compare with types2, which resolves the type broken_t4.t[P₁, Q₂ interface{m()}] here |
| {broken + `t4; type t[P, Q interface{ m() }] int; var _ t[int, int]`, `t`, `broken_t4.t`}, |
| |
| // instantiated types must be sanitized |
| {genericPkg + `g0; type t[P any] int; var x struct{ f t[int] }; var _ = x.f`, `x.f`, `generic_g0.t[int]`}, |
| |
| // issue 45096 |
| {genericPkg + `issue45096; func _[T interface{ type int8, int16, int32 }](x T) { _ = x < 0 }`, `0`, `T₁`}, |
| } |
| |
| for _, test := range tests { |
| ResetId() // avoid renumbering of type parameter ids when adding tests |
| if strings.HasPrefix(test.src, genericPkg) && !typeparams.Enabled { |
| continue |
| } |
| info := Info{Types: make(map[ast.Expr]TypeAndValue)} |
| var name string |
| if strings.HasPrefix(test.src, broken) { |
| var err error |
| name, err = mayTypecheck(t, "TypesInfo", test.src, &info) |
| if err == nil { |
| t.Errorf("package %s: expected to fail but passed", name) |
| continue |
| } |
| } else { |
| name = mustTypecheck(t, "TypesInfo", test.src, &info) |
| } |
| |
| // look for expression type |
| var typ Type |
| for e, tv := range info.Types { |
| if ExprString(e) == test.expr { |
| typ = tv.Type |
| break |
| } |
| } |
| if typ == nil { |
| t.Errorf("package %s: no type found for %s", name, test.expr) |
| continue |
| } |
| |
| // check that type is correct |
| if got := typ.String(); got != test.typ { |
| t.Errorf("package %s: got %s; want %s", name, got, test.typ) |
| } |
| } |
| } |
| |
| func TestDefsInfo(t *testing.T) { |
| var tests = []struct { |
| src string |
| obj string |
| want string |
| }{ |
| {`package p0; const x = 42`, `x`, `const p0.x untyped int`}, |
| {`package p1; const x int = 42`, `x`, `const p1.x int`}, |
| {`package p2; var x int`, `x`, `var p2.x int`}, |
| {`package p3; type x int`, `x`, `type p3.x int`}, |
| {`package p4; func f()`, `f`, `func p4.f()`}, |
| {`package p5; func f() int { x, _ := 1, 2; return x }`, `_`, `var _ int`}, |
| |
| // generic types must be sanitized |
| // (need to use sufficiently nested types to provoke unexpanded types) |
| {genericPkg + `g0; type t[P any] P; const x = t[int](42)`, `x`, `const generic_g0.x generic_g0.t[int]`}, |
| {genericPkg + `g1; type t[P any] P; var x = t[int](42)`, `x`, `var generic_g1.x generic_g1.t[int]`}, |
| {genericPkg + `g2; type t[P any] P; type x struct{ f t[int] }`, `x`, `type generic_g2.x struct{f generic_g2.t[int]}`}, |
| {genericPkg + `g3; type t[P any] P; func f(x struct{ f t[string] }); var g = f`, `g`, `var generic_g3.g func(x struct{f generic_g3.t[string]})`}, |
| } |
| |
| for _, test := range tests { |
| if strings.HasPrefix(test.src, genericPkg) && !typeparams.Enabled { |
| continue |
| } |
| info := Info{ |
| Defs: make(map[*ast.Ident]Object), |
| } |
| name := mustTypecheck(t, "DefsInfo", test.src, &info) |
| |
| // find object |
| var def Object |
| for id, obj := range info.Defs { |
| if id.Name == test.obj { |
| def = obj |
| break |
| } |
| } |
| if def == nil { |
| t.Errorf("package %s: %s not found", name, test.obj) |
| continue |
| } |
| |
| if got := def.String(); got != test.want { |
| t.Errorf("package %s: got %s; want %s", name, got, test.want) |
| } |
| } |
| } |
| |
| func TestUsesInfo(t *testing.T) { |
| var tests = []struct { |
| src string |
| obj string |
| want string |
| }{ |
| {`package p0; func _() { _ = x }; const x = 42`, `x`, `const p0.x untyped int`}, |
| {`package p1; func _() { _ = x }; const x int = 42`, `x`, `const p1.x int`}, |
| {`package p2; func _() { _ = x }; var x int`, `x`, `var p2.x int`}, |
| {`package p3; func _() { type _ x }; type x int`, `x`, `type p3.x int`}, |
| {`package p4; func _() { _ = f }; func f()`, `f`, `func p4.f()`}, |
| |
| // generic types must be sanitized |
| // (need to use sufficiently nested types to provoke unexpanded types) |
| {genericPkg + `g0; func _() { _ = x }; type t[P any] P; const x = t[int](42)`, `x`, `const generic_g0.x generic_g0.t[int]`}, |
| {genericPkg + `g1; func _() { _ = x }; type t[P any] P; var x = t[int](42)`, `x`, `var generic_g1.x generic_g1.t[int]`}, |
| {genericPkg + `g2; func _() { type _ x }; type t[P any] P; type x struct{ f t[int] }`, `x`, `type generic_g2.x struct{f generic_g2.t[int]}`}, |
| {genericPkg + `g3; func _() { _ = f }; type t[P any] P; func f(x struct{ f t[string] })`, `f`, `func generic_g3.f(x struct{f generic_g3.t[string]})`}, |
| } |
| |
| for _, test := range tests { |
| if strings.HasPrefix(test.src, genericPkg) && !typeparams.Enabled { |
| continue |
| } |
| info := Info{ |
| Uses: make(map[*ast.Ident]Object), |
| } |
| name := mustTypecheck(t, "UsesInfo", test.src, &info) |
| |
| // find object |
| var use Object |
| for id, obj := range info.Uses { |
| if id.Name == test.obj { |
| use = obj |
| break |
| } |
| } |
| if use == nil { |
| t.Errorf("package %s: %s not found", name, test.obj) |
| continue |
| } |
| |
| if got := use.String(); got != test.want { |
| t.Errorf("package %s: got %s; want %s", name, got, test.want) |
| } |
| } |
| } |
| |
| func TestImplicitsInfo(t *testing.T) { |
| testenv.MustHaveGoBuild(t) |
| |
| var tests = []struct { |
| src string |
| want string |
| }{ |
| {`package p2; import . "fmt"; var _ = Println`, ""}, // no Implicits entry |
| {`package p0; import local "fmt"; var _ = local.Println`, ""}, // no Implicits entry |
| {`package p1; import "fmt"; var _ = fmt.Println`, "importSpec: package fmt"}, |
| |
| {`package p3; func f(x interface{}) { switch x.(type) { case int: } }`, ""}, // no Implicits entry |
| {`package p4; func f(x interface{}) { switch t := x.(type) { case int: _ = t } }`, "caseClause: var t int"}, |
| {`package p5; func f(x interface{}) { switch t := x.(type) { case int, uint: _ = t } }`, "caseClause: var t interface{}"}, |
| {`package p6; func f(x interface{}) { switch t := x.(type) { default: _ = t } }`, "caseClause: var t interface{}"}, |
| |
| {`package p7; func f(x int) {}`, ""}, // no Implicits entry |
| {`package p8; func f(int) {}`, "field: var int"}, |
| {`package p9; func f() (complex64) { return 0 }`, "field: var complex64"}, |
| {`package p10; type T struct{}; func (*T) f() {}`, "field: var *p10.T"}, |
| } |
| |
| for _, test := range tests { |
| info := Info{ |
| Implicits: make(map[ast.Node]Object), |
| } |
| name := mustTypecheck(t, "ImplicitsInfo", test.src, &info) |
| |
| // the test cases expect at most one Implicits entry |
| if len(info.Implicits) > 1 { |
| t.Errorf("package %s: %d Implicits entries found", name, len(info.Implicits)) |
| continue |
| } |
| |
| // extract Implicits entry, if any |
| var got string |
| for n, obj := range info.Implicits { |
| switch x := n.(type) { |
| case *ast.ImportSpec: |
| got = "importSpec" |
| case *ast.CaseClause: |
| got = "caseClause" |
| case *ast.Field: |
| got = "field" |
| default: |
| t.Fatalf("package %s: unexpected %T", name, x) |
| } |
| got += ": " + obj.String() |
| } |
| |
| // verify entry |
| if got != test.want { |
| t.Errorf("package %s: got %q; want %q", name, got, test.want) |
| } |
| } |
| } |
| |
| func predString(tv TypeAndValue) string { |
| var buf bytes.Buffer |
| pred := func(b bool, s string) { |
| if b { |
| if buf.Len() > 0 { |
| buf.WriteString(", ") |
| } |
| buf.WriteString(s) |
| } |
| } |
| |
| pred(tv.IsVoid(), "void") |
| pred(tv.IsType(), "type") |
| pred(tv.IsBuiltin(), "builtin") |
| pred(tv.IsValue() && tv.Value != nil, "const") |
| pred(tv.IsValue() && tv.Value == nil, "value") |
| pred(tv.IsNil(), "nil") |
| pred(tv.Addressable(), "addressable") |
| pred(tv.Assignable(), "assignable") |
| pred(tv.HasOk(), "hasOk") |
| |
| if buf.Len() == 0 { |
| return "invalid" |
| } |
| return buf.String() |
| } |
| |
| func TestPredicatesInfo(t *testing.T) { |
| testenv.MustHaveGoBuild(t) |
| |
| var tests = []struct { |
| src string |
| expr string |
| pred string |
| }{ |
| // void |
| {`package n0; func f() { f() }`, `f()`, `void`}, |
| |
| // types |
| {`package t0; type _ int`, `int`, `type`}, |
| {`package t1; type _ []int`, `[]int`, `type`}, |
| {`package t2; type _ func()`, `func()`, `type`}, |
| {`package t3; type _ func(int)`, `int`, `type`}, |
| {`package t3; type _ func(...int)`, `...int`, `type`}, |
| |
| // built-ins |
| {`package b0; var _ = len("")`, `len`, `builtin`}, |
| {`package b1; var _ = (len)("")`, `(len)`, `builtin`}, |
| |
| // constants |
| {`package c0; var _ = 42`, `42`, `const`}, |
| {`package c1; var _ = "foo" + "bar"`, `"foo" + "bar"`, `const`}, |
| {`package c2; const (i = 1i; _ = i)`, `i`, `const`}, |
| |
| // values |
| {`package v0; var (a, b int; _ = a + b)`, `a + b`, `value`}, |
| {`package v1; var _ = &[]int{1}`, `([]int literal)`, `value`}, |
| {`package v2; var _ = func(){}`, `(func() literal)`, `value`}, |
| {`package v4; func f() { _ = f }`, `f`, `value`}, |
| {`package v3; var _ *int = nil`, `nil`, `value, nil`}, |
| {`package v3; var _ *int = (nil)`, `(nil)`, `value, nil`}, |
| |
| // addressable (and thus assignable) operands |
| {`package a0; var (x int; _ = x)`, `x`, `value, addressable, assignable`}, |
| {`package a1; var (p *int; _ = *p)`, `*p`, `value, addressable, assignable`}, |
| {`package a2; var (s []int; _ = s[0])`, `s[0]`, `value, addressable, assignable`}, |
| {`package a3; var (s struct{f int}; _ = s.f)`, `s.f`, `value, addressable, assignable`}, |
| {`package a4; var (a [10]int; _ = a[0])`, `a[0]`, `value, addressable, assignable`}, |
| {`package a5; func _(x int) { _ = x }`, `x`, `value, addressable, assignable`}, |
| {`package a6; func _()(x int) { _ = x; return }`, `x`, `value, addressable, assignable`}, |
| {`package a7; type T int; func (x T) _() { _ = x }`, `x`, `value, addressable, assignable`}, |
| // composite literals are not addressable |
| |
| // assignable but not addressable values |
| {`package s0; var (m map[int]int; _ = m[0])`, `m[0]`, `value, assignable, hasOk`}, |
| {`package s1; var (m map[int]int; _, _ = m[0])`, `m[0]`, `value, assignable, hasOk`}, |
| |
| // hasOk expressions |
| {`package k0; var (ch chan int; _ = <-ch)`, `<-ch`, `value, hasOk`}, |
| {`package k1; var (ch chan int; _, _ = <-ch)`, `<-ch`, `value, hasOk`}, |
| |
| // missing entries |
| // - package names are collected in the Uses map |
| // - identifiers being declared are collected in the Defs map |
| {`package m0; import "os"; func _() { _ = os.Stdout }`, `os`, `<missing>`}, |
| {`package m1; import p "os"; func _() { _ = p.Stdout }`, `p`, `<missing>`}, |
| {`package m2; const c = 0`, `c`, `<missing>`}, |
| {`package m3; type T int`, `T`, `<missing>`}, |
| {`package m4; var v int`, `v`, `<missing>`}, |
| {`package m5; func f() {}`, `f`, `<missing>`}, |
| {`package m6; func _(x int) {}`, `x`, `<missing>`}, |
| {`package m6; func _()(x int) { return }`, `x`, `<missing>`}, |
| {`package m6; type T int; func (x T) _() {}`, `x`, `<missing>`}, |
| } |
| |
| for _, test := range tests { |
| info := Info{Types: make(map[ast.Expr]TypeAndValue)} |
| name := mustTypecheck(t, "PredicatesInfo", test.src, &info) |
| |
| // look for expression predicates |
| got := "<missing>" |
| for e, tv := range info.Types { |
| //println(name, ExprString(e)) |
| if ExprString(e) == test.expr { |
| got = predString(tv) |
| break |
| } |
| } |
| |
| if got != test.pred { |
| t.Errorf("package %s: got %s; want %s", name, got, test.pred) |
| } |
| } |
| } |
| |
| func TestScopesInfo(t *testing.T) { |
| testenv.MustHaveGoBuild(t) |
| |
| var tests = []struct { |
| src string |
| scopes []string // list of scope descriptors of the form kind:varlist |
| }{ |
| {`package p0`, []string{ |
| "file:", |
| }}, |
| {`package p1; import ( "fmt"; m "math"; _ "os" ); var ( _ = fmt.Println; _ = m.Pi )`, []string{ |
| "file:fmt m", |
| }}, |
| {`package p2; func _() {}`, []string{ |
| "file:", "func:", |
| }}, |
| {`package p3; func _(x, y int) {}`, []string{ |
| "file:", "func:x y", |
| }}, |
| {`package p4; func _(x, y int) { x, z := 1, 2; _ = z }`, []string{ |
| "file:", "func:x y z", // redeclaration of x |
| }}, |
| {`package p5; func _(x, y int) (u, _ int) { return }`, []string{ |
| "file:", "func:u x y", |
| }}, |
| {`package p6; func _() { { var x int; _ = x } }`, []string{ |
| "file:", "func:", "block:x", |
| }}, |
| {`package p7; func _() { if true {} }`, []string{ |
| "file:", "func:", "if:", "block:", |
| }}, |
| {`package p8; func _() { if x := 0; x < 0 { y := x; _ = y } }`, []string{ |
| "file:", "func:", "if:x", "block:y", |
| }}, |
| {`package p9; func _() { switch x := 0; x {} }`, []string{ |
| "file:", "func:", "switch:x", |
| }}, |
| {`package p10; func _() { switch x := 0; x { case 1: y := x; _ = y; default: }}`, []string{ |
| "file:", "func:", "switch:x", "case:y", "case:", |
| }}, |
| {`package p11; func _(t interface{}) { switch t.(type) {} }`, []string{ |
| "file:", "func:t", "type switch:", |
| }}, |
| {`package p12; func _(t interface{}) { switch t := t; t.(type) {} }`, []string{ |
| "file:", "func:t", "type switch:t", |
| }}, |
| {`package p13; func _(t interface{}) { switch x := t.(type) { case int: _ = x } }`, []string{ |
| "file:", "func:t", "type switch:", "case:x", // x implicitly declared |
| }}, |
| {`package p14; func _() { select{} }`, []string{ |
| "file:", "func:", |
| }}, |
| {`package p15; func _(c chan int) { select{ case <-c: } }`, []string{ |
| "file:", "func:c", "comm:", |
| }}, |
| {`package p16; func _(c chan int) { select{ case i := <-c: x := i; _ = x} }`, []string{ |
| "file:", "func:c", "comm:i x", |
| }}, |
| {`package p17; func _() { for{} }`, []string{ |
| "file:", "func:", "for:", "block:", |
| }}, |
| {`package p18; func _(n int) { for i := 0; i < n; i++ { _ = i } }`, []string{ |
| "file:", "func:n", "for:i", "block:", |
| }}, |
| {`package p19; func _(a []int) { for i := range a { _ = i} }`, []string{ |
| "file:", "func:a", "range:i", "block:", |
| }}, |
| {`package p20; var s int; func _(a []int) { for i, x := range a { s += x; _ = i } }`, []string{ |
| "file:", "func:a", "range:i x", "block:", |
| }}, |
| } |
| |
| for _, test := range tests { |
| info := Info{Scopes: make(map[ast.Node]*Scope)} |
| name := mustTypecheck(t, "ScopesInfo", test.src, &info) |
| |
| // number of scopes must match |
| if len(info.Scopes) != len(test.scopes) { |
| t.Errorf("package %s: got %d scopes; want %d", name, len(info.Scopes), len(test.scopes)) |
| } |
| |
| // scope descriptions must match |
| for node, scope := range info.Scopes { |
| kind := "<unknown node kind>" |
| switch node.(type) { |
| case *ast.File: |
| kind = "file" |
| case *ast.FuncType: |
| kind = "func" |
| case *ast.BlockStmt: |
| kind = "block" |
| case *ast.IfStmt: |
| kind = "if" |
| case *ast.SwitchStmt: |
| kind = "switch" |
| case *ast.TypeSwitchStmt: |
| kind = "type switch" |
| case *ast.CaseClause: |
| kind = "case" |
| case *ast.CommClause: |
| kind = "comm" |
| case *ast.ForStmt: |
| kind = "for" |
| case *ast.RangeStmt: |
| kind = "range" |
| } |
| |
| // look for matching scope description |
| desc := kind + ":" + strings.Join(scope.Names(), " ") |
| found := false |
| for _, d := range test.scopes { |
| if desc == d { |
| found = true |
| break |
| } |
| } |
| if !found { |
| t.Errorf("package %s: no matching scope found for %s", name, desc) |
| } |
| } |
| } |
| } |
| |
| func TestInitOrderInfo(t *testing.T) { |
| var tests = []struct { |
| src string |
| inits []string |
| }{ |
| {`package p0; var (x = 1; y = x)`, []string{ |
| "x = 1", "y = x", |
| }}, |
| {`package p1; var (a = 1; b = 2; c = 3)`, []string{ |
| "a = 1", "b = 2", "c = 3", |
| }}, |
| {`package p2; var (a, b, c = 1, 2, 3)`, []string{ |
| "a = 1", "b = 2", "c = 3", |
| }}, |
| {`package p3; var _ = f(); func f() int { return 1 }`, []string{ |
| "_ = f()", // blank var |
| }}, |
| {`package p4; var (a = 0; x = y; y = z; z = 0)`, []string{ |
| "a = 0", "z = 0", "y = z", "x = y", |
| }}, |
| {`package p5; var (a, _ = m[0]; m map[int]string)`, []string{ |
| "a, _ = m[0]", // blank var |
| }}, |
| {`package p6; var a, b = f(); func f() (_, _ int) { return z, z }; var z = 0`, []string{ |
| "z = 0", "a, b = f()", |
| }}, |
| {`package p7; var (a = func() int { return b }(); b = 1)`, []string{ |
| "b = 1", "a = (func() int literal)()", |
| }}, |
| {`package p8; var (a, b = func() (_, _ int) { return c, c }(); c = 1)`, []string{ |
| "c = 1", "a, b = (func() (_, _ int) literal)()", |
| }}, |
| {`package p9; type T struct{}; func (T) m() int { _ = y; return 0 }; var x, y = T.m, 1`, []string{ |
| "y = 1", "x = T.m", |
| }}, |
| {`package p10; var (d = c + b; a = 0; b = 0; c = 0)`, []string{ |
| "a = 0", "b = 0", "c = 0", "d = c + b", |
| }}, |
| {`package p11; var (a = e + c; b = d + c; c = 0; d = 0; e = 0)`, []string{ |
| "c = 0", "d = 0", "b = d + c", "e = 0", "a = e + c", |
| }}, |
| // emit an initializer for n:1 initializations only once (not for each node |
| // on the lhs which may appear in different order in the dependency graph) |
| {`package p12; var (a = x; b = 0; x, y = m[0]; m map[int]int)`, []string{ |
| "b = 0", "x, y = m[0]", "a = x", |
| }}, |
| // test case from spec section on package initialization |
| {`package p12 |
| |
| var ( |
| a = c + b |
| b = f() |
| c = f() |
| d = 3 |
| ) |
| |
| func f() int { |
| d++ |
| return d |
| }`, []string{ |
| "d = 3", "b = f()", "c = f()", "a = c + b", |
| }}, |
| // test case for issue 7131 |
| {`package main |
| |
| var counter int |
| func next() int { counter++; return counter } |
| |
| var _ = makeOrder() |
| func makeOrder() []int { return []int{f, b, d, e, c, a} } |
| |
| var a = next() |
| var b, c = next(), next() |
| var d, e, f = next(), next(), next() |
| `, []string{ |
| "a = next()", "b = next()", "c = next()", "d = next()", "e = next()", "f = next()", "_ = makeOrder()", |
| }}, |
| // test case for issue 10709 |
| {`package p13 |
| |
| var ( |
| v = t.m() |
| t = makeT(0) |
| ) |
| |
| type T struct{} |
| |
| func (T) m() int { return 0 } |
| |
| func makeT(n int) T { |
| if n > 0 { |
| return makeT(n-1) |
| } |
| return T{} |
| }`, []string{ |
| "t = makeT(0)", "v = t.m()", |
| }}, |
| // test case for issue 10709: same as test before, but variable decls swapped |
| {`package p14 |
| |
| var ( |
| t = makeT(0) |
| v = t.m() |
| ) |
| |
| type T struct{} |
| |
| func (T) m() int { return 0 } |
| |
| func makeT(n int) T { |
| if n > 0 { |
| return makeT(n-1) |
| } |
| return T{} |
| }`, []string{ |
| "t = makeT(0)", "v = t.m()", |
| }}, |
| // another candidate possibly causing problems with issue 10709 |
| {`package p15 |
| |
| var y1 = f1() |
| |
| func f1() int { return g1() } |
| func g1() int { f1(); return x1 } |
| |
| var x1 = 0 |
| |
| var y2 = f2() |
| |
| func f2() int { return g2() } |
| func g2() int { return x2 } |
| |
| var x2 = 0`, []string{ |
| "x1 = 0", "y1 = f1()", "x2 = 0", "y2 = f2()", |
| }}, |
| } |
| |
| for _, test := range tests { |
| info := Info{} |
| name := mustTypecheck(t, "InitOrderInfo", test.src, &info) |
| |
| // number of initializers must match |
| if len(info.InitOrder) != len(test.inits) { |
| t.Errorf("package %s: got %d initializers; want %d", name, len(info.InitOrder), len(test.inits)) |
| continue |
| } |
| |
| // initializers must match |
| for i, want := range test.inits { |
| got := info.InitOrder[i].String() |
| if got != want { |
| t.Errorf("package %s, init %d: got %s; want %s", name, i, got, want) |
| continue |
| } |
| } |
| } |
| } |
| |
| func TestMultiFileInitOrder(t *testing.T) { |
| fset := token.NewFileSet() |
| mustParse := func(src string) *ast.File { |
| f, err := parser.ParseFile(fset, "main", src, 0) |
| if err != nil { |
| t.Fatal(err) |
| } |
| return f |
| } |
| |
| fileA := mustParse(`package main; var a = 1`) |
| fileB := mustParse(`package main; var b = 2`) |
| |
| // The initialization order must not depend on the parse |
| // order of the files, only on the presentation order to |
| // the type-checker. |
| for _, test := range []struct { |
| files []*ast.File |
| want string |
| }{ |
| {[]*ast.File{fileA, fileB}, "[a = 1 b = 2]"}, |
| {[]*ast.File{fileB, fileA}, "[b = 2 a = 1]"}, |
| } { |
| var info Info |
| if _, err := new(Config).Check("main", fset, test.files, &info); err != nil { |
| t.Fatal(err) |
| } |
| if got := fmt.Sprint(info.InitOrder); got != test.want { |
| t.Fatalf("got %s; want %s", got, test.want) |
| } |
| } |
| } |
| |
| func TestFiles(t *testing.T) { |
| var sources = []string{ |
| "package p; type T struct{}; func (T) m1() {}", |
| "package p; func (T) m2() {}; var x interface{ m1(); m2() } = T{}", |
| "package p; func (T) m3() {}; var y interface{ m1(); m2(); m3() } = T{}", |
| "package p", |
| } |
| |
| var conf Config |
| fset := token.NewFileSet() |
| pkg := NewPackage("p", "p") |
| var info Info |
| check := NewChecker(&conf, fset, pkg, &info) |
| |
| for i, src := range sources { |
| filename := fmt.Sprintf("sources%d", i) |
| f, err := parser.ParseFile(fset, filename, src, 0) |
| if err != nil { |
| t.Fatal(err) |
| } |
| if err := check.Files([]*ast.File{f}); err != nil { |
| t.Error(err) |
| } |
| } |
| |
| // check InitOrder is [x y] |
| var vars []string |
| for _, init := range info.InitOrder { |
| for _, v := range init.Lhs { |
| vars = append(vars, v.Name()) |
| } |
| } |
| if got, want := fmt.Sprint(vars), "[x y]"; got != want { |
| t.Errorf("InitOrder == %s, want %s", got, want) |
| } |
| } |
| |
| type testImporter map[string]*Package |
| |
| func (m testImporter) Import(path string) (*Package, error) { |
| if pkg := m[path]; pkg != nil { |
| return pkg, nil |
| } |
| return nil, fmt.Errorf("package %q not found", path) |
| } |
| |
| func TestSelection(t *testing.T) { |
| selections := make(map[*ast.SelectorExpr]*Selection) |
| |
| fset := token.NewFileSet() |
| imports := make(testImporter) |
| conf := Config{Importer: imports} |
| makePkg := func(path, src string) { |
| f, err := parser.ParseFile(fset, path+".go", src, 0) |
| if err != nil { |
| t.Fatal(err) |
| } |
| pkg, err := conf.Check(path, fset, []*ast.File{f}, &Info{Selections: selections}) |
| if err != nil { |
| t.Fatal(err) |
| } |
| imports[path] = pkg |
| } |
| |
| const libSrc = ` |
| package lib |
| type T float64 |
| const C T = 3 |
| var V T |
| func F() {} |
| func (T) M() {} |
| ` |
| const mainSrc = ` |
| package main |
| import "lib" |
| |
| type A struct { |
| *B |
| C |
| } |
| |
| type B struct { |
| b int |
| } |
| |
| func (B) f(int) |
| |
| type C struct { |
| c int |
| } |
| |
| func (C) g() |
| func (*C) h() |
| |
| func main() { |
| // qualified identifiers |
| var _ lib.T |
| _ = lib.C |
| _ = lib.F |
| _ = lib.V |
| _ = lib.T.M |
| |
| // fields |
| _ = A{}.B |
| _ = new(A).B |
| |
| _ = A{}.C |
| _ = new(A).C |
| |
| _ = A{}.b |
| _ = new(A).b |
| |
| _ = A{}.c |
| _ = new(A).c |
| |
| // methods |
| _ = A{}.f |
| _ = new(A).f |
| _ = A{}.g |
| _ = new(A).g |
| _ = new(A).h |
| |
| _ = B{}.f |
| _ = new(B).f |
| |
| _ = C{}.g |
| _ = new(C).g |
| _ = new(C).h |
| |
| // method expressions |
| _ = A.f |
| _ = (*A).f |
| _ = B.f |
| _ = (*B).f |
| }` |
| |
| wantOut := map[string][2]string{ |
| "lib.T.M": {"method expr (lib.T) M(lib.T)", ".[0]"}, |
| |
| "A{}.B": {"field (main.A) B *main.B", ".[0]"}, |
| "new(A).B": {"field (*main.A) B *main.B", "->[0]"}, |
| "A{}.C": {"field (main.A) C main.C", ".[1]"}, |
| "new(A).C": {"field (*main.A) C main.C", "->[1]"}, |
| "A{}.b": {"field (main.A) b int", "->[0 0]"}, |
| "new(A).b": {"field (*main.A) b int", "->[0 0]"}, |
| "A{}.c": {"field (main.A) c int", ".[1 0]"}, |
| "new(A).c": {"field (*main.A) c int", "->[1 0]"}, |
| |
| "A{}.f": {"method (main.A) f(int)", "->[0 0]"}, |
| "new(A).f": {"method (*main.A) f(int)", "->[0 0]"}, |
| "A{}.g": {"method (main.A) g()", ".[1 0]"}, |
| "new(A).g": {"method (*main.A) g()", "->[1 0]"}, |
| "new(A).h": {"method (*main.A) h()", "->[1 1]"}, // TODO(gri) should this report .[1 1] ? |
| "B{}.f": {"method (main.B) f(int)", ".[0]"}, |
| "new(B).f": {"method (*main.B) f(int)", "->[0]"}, |
| "C{}.g": {"method (main.C) g()", ".[0]"}, |
| "new(C).g": {"method (*main.C) g()", "->[0]"}, |
| "new(C).h": {"method (*main.C) h()", "->[1]"}, // TODO(gri) should this report .[1] ? |
| |
| "A.f": {"method expr (main.A) f(main.A, int)", "->[0 0]"}, |
| "(*A).f": {"method expr (*main.A) f(*main.A, int)", "->[0 0]"}, |
| "B.f": {"method expr (main.B) f(main.B, int)", ".[0]"}, |
| "(*B).f": {"method expr (*main.B) f(*main.B, int)", "->[0]"}, |
| } |
| |
| makePkg("lib", libSrc) |
| makePkg("main", mainSrc) |
| |
| for e, sel := range selections { |
| _ = sel.String() // assertion: must not panic |
| |
| start := fset.Position(e.Pos()).Offset |
| end := fset.Position(e.End()).Offset |
| syntax := mainSrc[start:end] // (all SelectorExprs are in main, not lib) |
| |
| direct := "." |
| if sel.Indirect() { |
| direct = "->" |
| } |
| got := [2]string{ |
| sel.String(), |
| fmt.Sprintf("%s%v", direct, sel.Index()), |
| } |
| want := wantOut[syntax] |
| if want != got { |
| t.Errorf("%s: got %q; want %q", syntax, got, want) |
| } |
| delete(wantOut, syntax) |
| |
| // We must explicitly assert properties of the |
| // Signature's receiver since it doesn't participate |
| // in Identical() or String(). |
| sig, _ := sel.Type().(*Signature) |
| if sel.Kind() == MethodVal { |
| got := sig.Recv().Type() |
| want := sel.Recv() |
| if !Identical(got, want) { |
| t.Errorf("%s: Recv() = %s, want %s", syntax, got, want) |
| } |
| } else if sig != nil && sig.Recv() != nil { |
| t.Errorf("%s: signature has receiver %s", sig, sig.Recv().Type()) |
| } |
| } |
| // Assert that all wantOut entries were used exactly once. |
| for syntax := range wantOut { |
| t.Errorf("no ast.Selection found with syntax %q", syntax) |
| } |
| } |
| |
| func TestIssue8518(t *testing.T) { |
| fset := token.NewFileSet() |
| imports := make(testImporter) |
| conf := Config{ |
| Error: func(err error) { t.Log(err) }, // don't exit after first error |
| Importer: imports, |
| } |
| makePkg := func(path, src string) { |
| f, err := parser.ParseFile(fset, path, src, 0) |
| if err != nil { |
| t.Fatal(err) |
| } |
| pkg, _ := conf.Check(path, fset, []*ast.File{f}, nil) // errors logged via conf.Error |
| imports[path] = pkg |
| } |
| |
| const libSrc = ` |
| package a |
| import "missing" |
| const C1 = foo |
| const C2 = missing.C |
| ` |
| |
| const mainSrc = ` |
| package main |
| import "a" |
| var _ = a.C1 |
| var _ = a.C2 |
| ` |
| |
| makePkg("a", libSrc) |
| makePkg("main", mainSrc) // don't crash when type-checking this package |
| } |
| |
| func TestLookupFieldOrMethod(t *testing.T) { |
| t.Skip("skipping for gccgo--no importer") |
| // Test cases assume a lookup of the form a.f or x.f, where a stands for an |
| // addressable value, and x for a non-addressable value (even though a variable |
| // for ease of test case writing). |
| // |
| // Should be kept in sync with TestMethodSet. |
| var tests = []struct { |
| src string |
| found bool |
| index []int |
| indirect bool |
| }{ |
| // field lookups |
| {"var x T; type T struct{}", false, nil, false}, |
| {"var x T; type T struct{ f int }", true, []int{0}, false}, |
| {"var x T; type T struct{ a, b, f, c int }", true, []int{2}, false}, |
| |
| // method lookups |
| {"var a T; type T struct{}; func (T) f() {}", true, []int{0}, false}, |
| {"var a *T; type T struct{}; func (T) f() {}", true, []int{0}, true}, |
| {"var a T; type T struct{}; func (*T) f() {}", true, []int{0}, false}, |
| {"var a *T; type T struct{}; func (*T) f() {}", true, []int{0}, true}, // TODO(gri) should this report indirect = false? |
| |
| // collisions |
| {"type ( E1 struct{ f int }; E2 struct{ f int }; x struct{ E1; *E2 })", false, []int{1, 0}, false}, |
| {"type ( E1 struct{ f int }; E2 struct{}; x struct{ E1; *E2 }); func (E2) f() {}", false, []int{1, 0}, false}, |
| |
| // outside methodset |
| // (*T).f method exists, but value of type T is not addressable |
| {"var x T; type T struct{}; func (*T) f() {}", false, nil, true}, |
| } |
| |
| for _, test := range tests { |
| pkg, err := pkgFor("test", "package p;"+test.src, nil) |
| if err != nil { |
| t.Errorf("%s: incorrect test case: %s", test.src, err) |
| continue |
| } |
| |
| obj := pkg.Scope().Lookup("a") |
| if obj == nil { |
| if obj = pkg.Scope().Lookup("x"); obj == nil { |
| t.Errorf("%s: incorrect test case - no object a or x", test.src) |
| continue |
| } |
| } |
| |
| f, index, indirect := LookupFieldOrMethod(obj.Type(), obj.Name() == "a", pkg, "f") |
| if (f != nil) != test.found { |
| if f == nil { |
| t.Errorf("%s: got no object; want one", test.src) |
| } else { |
| t.Errorf("%s: got object = %v; want none", test.src, f) |
| } |
| } |
| if !sameSlice(index, test.index) { |
| t.Errorf("%s: got index = %v; want %v", test.src, index, test.index) |
| } |
| if indirect != test.indirect { |
| t.Errorf("%s: got indirect = %v; want %v", test.src, indirect, test.indirect) |
| } |
| } |
| } |
| |
| func sameSlice(a, b []int) bool { |
| if len(a) != len(b) { |
| return false |
| } |
| for i, x := range a { |
| if x != b[i] { |
| return false |
| } |
| } |
| return true |
| } |
| |
| // TestScopeLookupParent ensures that (*Scope).LookupParent returns |
| // the correct result at various positions with the source. |
| func TestScopeLookupParent(t *testing.T) { |
| fset := token.NewFileSet() |
| imports := make(testImporter) |
| conf := Config{Importer: imports} |
| mustParse := func(src string) *ast.File { |
| f, err := parser.ParseFile(fset, "dummy.go", src, parser.ParseComments) |
| if err != nil { |
| t.Fatal(err) |
| } |
| return f |
| } |
| var info Info |
| makePkg := func(path string, files ...*ast.File) { |
| var err error |
| imports[path], err = conf.Check(path, fset, files, &info) |
| if err != nil { |
| t.Fatal(err) |
| } |
| } |
| |
| makePkg("lib", mustParse("package lib; var X int")) |
| // Each /*name=kind:line*/ comment makes the test look up the |
| // name at that point and checks that it resolves to a decl of |
| // the specified kind and line number. "undef" means undefined. |
| mainSrc := ` |
| /*lib=pkgname:5*/ /*X=var:1*/ /*Pi=const:8*/ /*T=typename:9*/ /*Y=var:10*/ /*F=func:12*/ |
| package main |
| |
| import "lib" |
| import . "lib" |
| |
| const Pi = 3.1415 |
| type T struct{} |
| var Y, _ = lib.X, X |
| |
| func F(){ |
| const pi, e = 3.1415, /*pi=undef*/ 2.71828 /*pi=const:13*/ /*e=const:13*/ |
| type /*t=undef*/ t /*t=typename:14*/ *t |
| print(Y) /*Y=var:10*/ |
| x, Y := Y, /*x=undef*/ /*Y=var:10*/ Pi /*x=var:16*/ /*Y=var:16*/ ; _ = x; _ = Y |
| var F = /*F=func:12*/ F /*F=var:17*/ ; _ = F |
| |
| var a []int |
| for i, x := range /*i=undef*/ /*x=var:16*/ a /*i=var:20*/ /*x=var:20*/ { _ = i; _ = x } |
| |
| var i interface{} |
| switch y := i.(type) { /*y=undef*/ |
| case /*y=undef*/ int /*y=var:23*/ : |
| case float32, /*y=undef*/ float64 /*y=var:23*/ : |
| default /*y=var:23*/: |
| println(y) |
| } |
| /*y=undef*/ |
| |
| switch int := i.(type) { |
| case /*int=typename:0*/ int /*int=var:31*/ : |
| println(int) |
| default /*int=var:31*/ : |
| } |
| } |
| /*main=undef*/ |
| ` |
| |
| info.Uses = make(map[*ast.Ident]Object) |
| f := mustParse(mainSrc) |
| makePkg("main", f) |
| mainScope := imports["main"].Scope() |
| rx := regexp.MustCompile(`^/\*(\w*)=([\w:]*)\*/$`) |
| for _, group := range f.Comments { |
| for _, comment := range group.List { |
| // Parse the assertion in the comment. |
| m := rx.FindStringSubmatch(comment.Text) |
| if m == nil { |
| t.Errorf("%s: bad comment: %s", |
| fset.Position(comment.Pos()), comment.Text) |
| continue |
| } |
| name, want := m[1], m[2] |
| |
| // Look up the name in the innermost enclosing scope. |
| inner := mainScope.Innermost(comment.Pos()) |
| if inner == nil { |
| t.Errorf("%s: at %s: can't find innermost scope", |
| fset.Position(comment.Pos()), comment.Text) |
| continue |
| } |
| got := "undef" |
| if _, obj := inner.LookupParent(name, comment.Pos()); obj != nil { |
| kind := strings.ToLower(strings.TrimPrefix(reflect.TypeOf(obj).String(), "*types.")) |
| got = fmt.Sprintf("%s:%d", kind, fset.Position(obj.Pos()).Line) |
| } |
| if got != want { |
| t.Errorf("%s: at %s: %s resolved to %s, want %s", |
| fset.Position(comment.Pos()), comment.Text, name, got, want) |
| } |
| } |
| } |
| |
| // Check that for each referring identifier, |
| // a lookup of its name on the innermost |
| // enclosing scope returns the correct object. |
| |
| for id, wantObj := range info.Uses { |
| inner := mainScope.Innermost(id.Pos()) |
| if inner == nil { |
| t.Errorf("%s: can't find innermost scope enclosing %q", |
| fset.Position(id.Pos()), id.Name) |
| continue |
| } |
| |
| // Exclude selectors and qualified identifiers---lexical |
| // refs only. (Ideally, we'd see if the AST parent is a |
| // SelectorExpr, but that requires PathEnclosingInterval |
| // from golang.org/x/tools/go/ast/astutil.) |
| if id.Name == "X" { |
| continue |
| } |
| |
| _, gotObj := inner.LookupParent(id.Name, id.Pos()) |
| if gotObj != wantObj { |
| t.Errorf("%s: got %v, want %v", |
| fset.Position(id.Pos()), gotObj, wantObj) |
| continue |
| } |
| } |
| } |
| |
| func TestConvertibleTo(t *testing.T) { |
| for _, test := range []struct { |
| v, t Type |
| want bool |
| }{ |
| {Typ[Int], Typ[Int], true}, |
| {Typ[Int], Typ[Float32], true}, |
| {newDefined(Typ[Int]), Typ[Int], true}, |
| {newDefined(new(Struct)), new(Struct), true}, |
| {newDefined(Typ[Int]), new(Struct), false}, |
| {Typ[UntypedInt], Typ[Int], true}, |
| {NewSlice(Typ[Int]), NewPointer(NewArray(Typ[Int], 10)), true}, |
| {NewSlice(Typ[Int]), NewArray(Typ[Int], 10), false}, |
| {NewSlice(Typ[Int]), NewPointer(NewArray(Typ[Uint], 10)), false}, |
| // Untyped string values are not permitted by the spec, so the below |
| // behavior is undefined. |
| {Typ[UntypedString], Typ[String], true}, |
| } { |
| if got := ConvertibleTo(test.v, test.t); got != test.want { |
| t.Errorf("ConvertibleTo(%v, %v) = %t, want %t", test.v, test.t, got, test.want) |
| } |
| } |
| } |
| |
| func TestAssignableTo(t *testing.T) { |
| for _, test := range []struct { |
| v, t Type |
| want bool |
| }{ |
| {Typ[Int], Typ[Int], true}, |
| {Typ[Int], Typ[Float32], false}, |
| {newDefined(Typ[Int]), Typ[Int], false}, |
| {newDefined(new(Struct)), new(Struct), true}, |
| {Typ[UntypedBool], Typ[Bool], true}, |
| {Typ[UntypedString], Typ[Bool], false}, |
| // Neither untyped string nor untyped numeric assignments arise during |
| // normal type checking, so the below behavior is technically undefined by |
| // the spec. |
| {Typ[UntypedString], Typ[String], true}, |
| {Typ[UntypedInt], Typ[Int], true}, |
| } { |
| if got := AssignableTo(test.v, test.t); got != test.want { |
| t.Errorf("AssignableTo(%v, %v) = %t, want %t", test.v, test.t, got, test.want) |
| } |
| } |
| } |
| |
| func TestIdentical_issue15173(t *testing.T) { |
| // Identical should allow nil arguments and be symmetric. |
| for _, test := range []struct { |
| x, y Type |
| want bool |
| }{ |
| {Typ[Int], Typ[Int], true}, |
| {Typ[Int], nil, false}, |
| {nil, Typ[Int], false}, |
| {nil, nil, true}, |
| } { |
| if got := Identical(test.x, test.y); got != test.want { |
| t.Errorf("Identical(%v, %v) = %t", test.x, test.y, got) |
| } |
| } |
| } |
| |
| func TestIssue15305(t *testing.T) { |
| const src = "package p; func f() int16; var _ = f(undef)" |
| fset := token.NewFileSet() |
| f, err := parser.ParseFile(fset, "issue15305.go", src, 0) |
| if err != nil { |
| t.Fatal(err) |
| } |
| conf := Config{ |
| Error: func(err error) {}, // allow errors |
| } |
| info := &Info{ |
| Types: make(map[ast.Expr]TypeAndValue), |
| } |
| conf.Check("p", fset, []*ast.File{f}, info) // ignore result |
| for e, tv := range info.Types { |
| if _, ok := e.(*ast.CallExpr); ok { |
| if tv.Type != Typ[Int16] { |
| t.Errorf("CallExpr has type %v, want int16", tv.Type) |
| } |
| return |
| } |
| } |
| t.Errorf("CallExpr has no type") |
| } |
| |
| // TestCompositeLitTypes verifies that Info.Types registers the correct |
| // types for composite literal expressions and composite literal type |
| // expressions. |
| func TestCompositeLitTypes(t *testing.T) { |
| for _, test := range []struct { |
| lit, typ string |
| }{ |
| {`[16]byte{}`, `[16]byte`}, |
| {`[...]byte{}`, `[0]byte`}, // test for issue #14092 |
| {`[...]int{1, 2, 3}`, `[3]int`}, // test for issue #14092 |
| {`[...]int{90: 0, 98: 1, 2}`, `[100]int`}, // test for issue #14092 |
| {`[]int{}`, `[]int`}, |
| {`map[string]bool{"foo": true}`, `map[string]bool`}, |
| {`struct{}{}`, `struct{}`}, |
| {`struct{x, y int; z complex128}{}`, `struct{x int; y int; z complex128}`}, |
| } { |
| fset := token.NewFileSet() |
| f, err := parser.ParseFile(fset, test.lit, "package p; var _ = "+test.lit, 0) |
| if err != nil { |
| t.Fatalf("%s: %v", test.lit, err) |
| } |
| |
| info := &Info{ |
| Types: make(map[ast.Expr]TypeAndValue), |
| } |
| if _, err = new(Config).Check("p", fset, []*ast.File{f}, info); err != nil { |
| t.Fatalf("%s: %v", test.lit, err) |
| } |
| |
| cmptype := func(x ast.Expr, want string) { |
| tv, ok := info.Types[x] |
| if !ok { |
| t.Errorf("%s: no Types entry found", test.lit) |
| return |
| } |
| if tv.Type == nil { |
| t.Errorf("%s: type is nil", test.lit) |
| return |
| } |
| if got := tv.Type.String(); got != want { |
| t.Errorf("%s: got %v, want %s", test.lit, got, want) |
| } |
| } |
| |
| // test type of composite literal expression |
| rhs := f.Decls[0].(*ast.GenDecl).Specs[0].(*ast.ValueSpec).Values[0] |
| cmptype(rhs, test.typ) |
| |
| // test type of composite literal type expression |
| cmptype(rhs.(*ast.CompositeLit).Type, test.typ) |
| } |
| } |
| |
| // TestObjectParents verifies that objects have parent scopes or not |
| // as specified by the Object interface. |
| func TestObjectParents(t *testing.T) { |
| const src = ` |
| package p |
| |
| const C = 0 |
| |
| type T1 struct { |
| a, b int |
| T2 |
| } |
| |
| type T2 interface { |
| im1() |
| im2() |
| } |
| |
| func (T1) m1() {} |
| func (*T1) m2() {} |
| |
| func f(x int) { y := x; print(y) } |
| ` |
| |
| fset := token.NewFileSet() |
| f, err := parser.ParseFile(fset, "src", src, 0) |
| if err != nil { |
| t.Fatal(err) |
| } |
| |
| info := &Info{ |
| Defs: make(map[*ast.Ident]Object), |
| } |
| if _, err = new(Config).Check("p", fset, []*ast.File{f}, info); err != nil { |
| t.Fatal(err) |
| } |
| |
| for ident, obj := range info.Defs { |
| if obj == nil { |
| // only package names and implicit vars have a nil object |
| // (in this test we only need to handle the package name) |
| if ident.Name != "p" { |
| t.Errorf("%v has nil object", ident) |
| } |
| continue |
| } |
| |
| // struct fields, type-associated and interface methods |
| // have no parent scope |
| wantParent := true |
| switch obj := obj.(type) { |
| case *Var: |
| if obj.IsField() { |
| wantParent = false |
| } |
| case *Func: |
| if obj.Type().(*Signature).Recv() != nil { // method |
| wantParent = false |
| } |
| } |
| |
| gotParent := obj.Parent() != nil |
| switch { |
| case gotParent && !wantParent: |
| t.Errorf("%v: want no parent, got %s", ident, obj.Parent()) |
| case !gotParent && wantParent: |
| t.Errorf("%v: no parent found", ident) |
| } |
| } |
| } |
| |
| // TestFailedImport tests that we don't get follow-on errors |
| // elsewhere in a package due to failing to import a package. |
| func TestFailedImport(t *testing.T) { |
| testenv.MustHaveGoBuild(t) |
| |
| const src = ` |
| package p |
| |
| import foo "go/types/thisdirectorymustnotexistotherwisethistestmayfail/foo" // should only see an error here |
| |
| const c = foo.C |
| type T = foo.T |
| var v T = c |
| func f(x T) T { return foo.F(x) } |
| ` |
| fset := token.NewFileSet() |
| f, err := parser.ParseFile(fset, "src", src, 0) |
| if err != nil { |
| t.Fatal(err) |
| } |
| files := []*ast.File{f} |
| |
| // type-check using all possible importers |
| for _, compiler := range []string{"gc", "gccgo", "source"} { |
| errcount := 0 |
| conf := Config{ |
| Error: func(err error) { |
| // we should only see the import error |
| if errcount > 0 || !strings.Contains(err.Error(), "could not import") { |
| t.Errorf("for %s importer, got unexpected error: %v", compiler, err) |
| } |
| errcount++ |
| }, |
| Importer: importer.For(compiler, nil), |
| } |
| |
| info := &Info{ |
| Uses: make(map[*ast.Ident]Object), |
| } |
| pkg, _ := conf.Check("p", fset, files, info) |
| if pkg == nil { |
| t.Errorf("for %s importer, type-checking failed to return a package", compiler) |
| continue |
| } |
| |
| imports := pkg.Imports() |
| if len(imports) != 1 { |
| t.Errorf("for %s importer, got %d imports, want 1", compiler, len(imports)) |
| continue |
| } |
| imp := imports[0] |
| if imp.Name() != "foo" { |
| t.Errorf(`for %s importer, got %q, want "foo"`, compiler, imp.Name()) |
| continue |
| } |
| |
| // verify that all uses of foo refer to the imported package foo (imp) |
| for ident, obj := range info.Uses { |
| if ident.Name == "foo" { |
| if obj, ok := obj.(*PkgName); ok { |
| if obj.Imported() != imp { |
| t.Errorf("%s resolved to %v; want %v", ident, obj.Imported(), imp) |
| } |
| } else { |
| t.Errorf("%s resolved to %v; want package name", ident, obj) |
| } |
| } |
| } |
| } |
| } |
