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// 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"
"errors"
"fmt"
"go/ast"
"go/importer"
"go/internal/typeparams"
"go/parser"
"go/token"
"internal/testenv"
"reflect"
"regexp"
"sort"
"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) {
mode := modeForSource(source)
return pkgForMode(path, source, info, mode)
}
func pkgForMode(path, source string, info *Info, mode parser.Mode) (*Package, error) {
fset := token.NewFileSet()
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 {
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 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
{`package g1; var(j int32; s int; n = 1.0<<s == j)`, `1.0`, `int32`, `1`}, // issue #48422
}
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.`, `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]invalid type`},
// parameterized functions
{genericPkg + `p0; func f[T any](T) {}; var _ = f[int]`, `f`, `func[T any](T)`},
{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(int)`},
{genericPkg + `p3; func f[T any](T) {}; func _() { f[int](42) }`, `f[int]`, `func(int)`},
{genericPkg + `p4; func f[T any](T) {}; func _() { f[int](42) }`, `f`, `func[T any](T)`},
{genericPkg + `p5; 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[P any]`},
{genericPkg + `t2; type t[P interface{}] int; var _ t[int]`, `t`, `generic_t2.t[P interface{}]`},
{genericPkg + `t3; type t[P, Q interface{}] int; var _ t[int, int]`, `t`, `generic_t3.t[P, Q 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{ ~int8 | ~int16 | ~int32 }](x T) { _ = x < 0 }`, `0`, `T`},
// issue 47895
{`package p; import "unsafe"; type S struct { f int }; var s S; var _ = unsafe.Offsetof(s.f)`, `s.f`, `int`},
// issue 50093
{genericPkg + `u0a; func _[_ interface{int}]() {}`, `int`, `int`},
{genericPkg + `u1a; func _[_ interface{~int}]() {}`, `~int`, `~int`},
{genericPkg + `u2a; func _[_ interface{int|string}]() {}`, `int | string`, `int|string`},
{genericPkg + `u3a; func _[_ interface{int|string|~bool}]() {}`, `int | string | ~bool`, `int|string|~bool`},
{genericPkg + `u3a; func _[_ interface{int|string|~bool}]() {}`, `int | string`, `int|string`},
{genericPkg + `u3a; func _[_ interface{int|string|~bool}]() {}`, `~bool`, `~bool`},
{genericPkg + `u3a; func _[_ interface{int|string|~float64|~bool}]() {}`, `int | string | ~float64`, `int|string|~float64`},
{genericPkg + `u0b; func _[_ int]() {}`, `int`, `int`},
{genericPkg + `u1b; func _[_ ~int]() {}`, `~int`, `~int`},
{genericPkg + `u2b; func _[_ int|string]() {}`, `int | string`, `int|string`},
{genericPkg + `u3b; func _[_ int|string|~bool]() {}`, `int | string | ~bool`, `int|string|~bool`},
{genericPkg + `u3b; func _[_ int|string|~bool]() {}`, `int | string`, `int|string`},
{genericPkg + `u3b; func _[_ int|string|~bool]() {}`, `~bool`, `~bool`},
{genericPkg + `u3b; func _[_ int|string|~float64|~bool]() {}`, `int | string | ~float64`, `int|string|~float64`},
{genericPkg + `u0c; type _ interface{int}`, `int`, `int`},
{genericPkg + `u1c; type _ interface{~int}`, `~int`, `~int`},
{genericPkg + `u2c; type _ interface{int|string}`, `int | string`, `int|string`},
{genericPkg + `u3c; type _ interface{int|string|~bool}`, `int | string | ~bool`, `int|string|~bool`},
{genericPkg + `u3c; type _ interface{int|string|~bool}`, `int | string`, `int|string`},
{genericPkg + `u3c; type _ interface{int|string|~bool}`, `~bool`, `~bool`},
{genericPkg + `u3c; type _ interface{int|string|~float64|~bool}`, `int | string | ~float64`, `int|string|~float64`},
}
for _, test := range tests {
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 TestInstanceInfo(t *testing.T) {
const lib = `package lib
func F[P any](P) {}
type T[P any] []P
`
type testInst struct {
name string
targs []string
typ string
}
var tests = []struct {
src string
instances []testInst // recorded instances in source order
}{
{`package p0; func f[T any](T) {}; func _() { f(42) }`,
[]testInst{{`f`, []string{`int`}, `func(int)`}},
},
{`package p1; func f[T any](T) T { panic(0) }; func _() { f('@') }`,
[]testInst{{`f`, []string{`rune`}, `func(rune) rune`}},
},
{`package p2; func f[T any](...T) T { panic(0) }; func _() { f(0i) }`,
[]testInst{{`f`, []string{`complex128`}, `func(...complex128) complex128`}},
},
{`package p3; func f[A, B, C any](A, *B, []C) {}; func _() { f(1.2, new(string), []byte{}) }`,
[]testInst{{`f`, []string{`float64`, `string`, `byte`}, `func(float64, *string, []byte)`}},
},
{`package p4; func f[A, B any](A, *B, ...[]B) {}; func _() { f(1.2, new(byte)) }`,
[]testInst{{`f`, []string{`float64`, `byte`}, `func(float64, *byte, ...[]byte)`}},
},
{`package s1; func f[T any, P interface{*T}](x T) {}; func _(x string) { f(x) }`,
[]testInst{{`f`, []string{`string`, `*string`}, `func(x string)`}},
},
{`package s2; func f[T any, P interface{*T}](x []T) {}; func _(x []int) { f(x) }`,
[]testInst{{`f`, []string{`int`, `*int`}, `func(x []int)`}},
},
{`package s3; type C[T any] interface{chan<- T}; func f[T any, P C[T]](x []T) {}; func _(x []int) { f(x) }`,
[]testInst{
{`C`, []string{`T`}, `interface{chan<- T}`},
{`f`, []string{`int`, `chan<- int`}, `func(x []int)`},
},
},
{`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) }`,
[]testInst{
{`C`, []string{`T`}, `interface{chan<- T}`},
{`C`, []string{`[]*P`}, `interface{chan<- []*P}`},
{`f`, []string{`int`, `chan<- int`, `chan<- []*chan<- int`}, `func(x []int)`},
},
},
{`package t1; func f[T any, P interface{*T}]() T { panic(0) }; func _() { _ = f[string] }`,
[]testInst{{`f`, []string{`string`, `*string`}, `func() string`}},
},
{`package t2; func f[T any, P interface{*T}]() T { panic(0) }; func _() { _ = (f[string]) }`,
[]testInst{{`f`, []string{`string`, `*string`}, `func() string`}},
},
{`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] }`,
[]testInst{
{`C`, []string{`T`}, `interface{chan<- T}`},
{`C`, []string{`[]*P`}, `interface{chan<- []*P}`},
{`f`, []string{`int`, `chan<- int`, `chan<- []*chan<- int`}, `func() []int`},
},
},
{`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]) }`,
[]testInst{
{`C`, []string{`T`}, `interface{chan<- T}`},
{`C`, []string{`[]*P`}, `interface{chan<- []*P}`},
{`f`, []string{`int`, `chan<- int`, `chan<- []*chan<- int`}, `func() []int`},
},
},
{`package i0; import "lib"; func _() { lib.F(42) }`,
[]testInst{{`F`, []string{`int`}, `func(int)`}},
},
{`package duplfunc0; func f[T any](T) {}; func _() { f(42); f("foo"); f[int](3) }`,
[]testInst{
{`f`, []string{`int`}, `func(int)`},
{`f`, []string{`string`}, `func(string)`},
{`f`, []string{`int`}, `func(int)`},
},
},
{`package duplfunc1; import "lib"; func _() { lib.F(42); lib.F("foo"); lib.F(3) }`,
[]testInst{
{`F`, []string{`int`}, `func(int)`},
{`F`, []string{`string`}, `func(string)`},
{`F`, []string{`int`}, `func(int)`},
},
},
{`package type0; type T[P interface{~int}] struct{ x P }; var _ T[int]`,
[]testInst{{`T`, []string{`int`}, `struct{x int}`}},
},
{`package type1; type T[P interface{~int}] struct{ x P }; var _ (T[int])`,
[]testInst{{`T`, []string{`int`}, `struct{x int}`}},
},
{`package type2; type T[P interface{~int}] struct{ x P }; var _ T[(int)]`,
[]testInst{{`T`, []string{`int`}, `struct{x int}`}},
},
{`package type3; type T[P1 interface{~[]P2}, P2 any] struct{ x P1; y P2 }; var _ T[[]int, int]`,
[]testInst{{`T`, []string{`[]int`, `int`}, `struct{x []int; y int}`}},
},
{`package type4; import "lib"; var _ lib.T[int]`,
[]testInst{{`T`, []string{`int`}, `[]int`}},
},
{`package dupltype0; type T[P interface{~int}] struct{ x P }; var x T[int]; var y T[int]`,
[]testInst{
{`T`, []string{`int`}, `struct{x int}`},
{`T`, []string{`int`}, `struct{x int}`},
},
},
{`package dupltype1; type T[P ~int] struct{ x P }; func (r *T[Q]) add(z T[Q]) { r.x += z.x }`,
[]testInst{
{`T`, []string{`Q`}, `struct{x Q}`},
{`T`, []string{`Q`}, `struct{x Q}`},
},
},
{`package dupltype1; import "lib"; var x lib.T[int]; var y lib.T[int]; var z lib.T[string]`,
[]testInst{
{`T`, []string{`int`}, `[]int`},
{`T`, []string{`int`}, `[]int`},
{`T`, []string{`string`}, `[]string`},
},
},
}
for _, test := range tests {
imports := make(testImporter)
conf := Config{Importer: imports}
instMap := make(map[*ast.Ident]Instance)
useMap := make(map[*ast.Ident]Object)
makePkg := func(src string) *Package {
f, err := parser.ParseFile(fset, "p.go", src, 0)
if err != nil {
t.Fatal(err)
}
pkg, err := conf.Check("", fset, []*ast.File{f}, &Info{Instances: instMap, Uses: useMap})
if err != nil {
t.Fatal(err)
}
imports[pkg.Name()] = pkg
return pkg
}
makePkg(lib)
pkg := makePkg(test.src)
t.Run(pkg.Name(), func(t *testing.T) {
// Sort instances in source order for stability.
instances := sortedInstances(instMap)
if got, want := len(instances), len(test.instances); got != want {
t.Fatalf("got %d instances, want %d", got, want)
}
// Pairwise compare with the expected instances.
for ii, inst := range instances {
var targs []Type
for i := 0; i < inst.Inst.TypeArgs.Len(); i++ {
targs = append(targs, inst.Inst.TypeArgs.At(i))
}
typ := inst.Inst.Type
testInst := test.instances[ii]
if got := inst.Ident.Name; got != testInst.name {
t.Fatalf("got name %s, want %s", got, testInst.name)
}
if len(targs) != len(testInst.targs) {
t.Fatalf("got %d type arguments; want %d", len(targs), len(testInst.targs))
}
for i, targ := range targs {
if got := targ.String(); got != testInst.targs[i] {
t.Errorf("type argument %d: got %s; want %s", i, got, testInst.targs[i])
}
}
if got := typ.Underlying().String(); got != testInst.typ {
t.Errorf("package %s: got %s; want %s", pkg.Name(), got, testInst.typ)
}
// Verify the invariant that re-instantiating the corresponding generic
// type with TypeArgs results in an identical instance.
ptype := useMap[inst.Ident].Type()
lister, _ := ptype.(interface{ TypeParams() *TypeParamList })
if lister == nil || lister.TypeParams().Len() == 0 {
t.Fatalf("info.Types[%v] = %v, want parameterized type", inst.Ident, ptype)
}
inst2, err := Instantiate(nil, ptype, targs, true)
if err != nil {
t.Errorf("Instantiate(%v, %v) failed: %v", ptype, targs, err)
}
if !Identical(inst.Inst.Type, inst2) {
t.Errorf("%v and %v are not identical", inst.Inst.Type, inst2)
}
}
})
}
}
type recordedInstance struct {
Ident *ast.Ident
Inst Instance
}
func sortedInstances(m map[*ast.Ident]Instance) (instances []recordedInstance) {
for id, inst := range m {
instances = append(instances, recordedInstance{id, inst})
}
sort.Slice(instances, func(i, j int) bool {
return instances[i].Ident.Pos() < instances[j].Ident.Pos()
})
return instances
}
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`},
// Tests using generics.
{`package generic_g0; type x[T any] int`, `x`, `type generic_g0.x[T any] int`},
{`package generic_g1; func f[T any]() {}`, `f`, `func generic_g1.f[T any]()`},
{`package generic_g2; type x[T any] int; func (*x[_]) m() {}`, `m`, `func (*generic_g2.x[_]).m()`},
}
for _, test := range tests {
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()`},
// Tests using generics.
{`package generic_g0; func _[T any]() { _ = x }; const x = 42`, `x`, `const generic_g0.x untyped int`},
{`package generic_g1; func _[T any](x T) { }`, `T`, `type parameter T any`},
{`package generic_g2; type N[A any] int; var _ N[int]`, `N`, `type generic_g2.N[A any] int`},
{`package generic_g3; type N[A any] int; func (N[_]) m() {}`, `N`, `type generic_g3.N[A any] int`},
// Uses of fields are instantiated.
{`package generic_s1; type N[A any] struct{ a A }; var f = N[int]{}.a`, `a`, `field a int`},
{`package generic_s1; type N[A any] struct{ a A }; func (r N[B]) m(b B) { r.a = b }`, `a`, `field a B`},
// Uses of methods are uses of the instantiated method.
{`package generic_m0; type N[A any] int; func (r N[B]) m() { r.n() }; func (N[C]) n() {}`, `n`, `func (generic_m0.N[B]).n()`},
{`package generic_m1; type N[A any] int; func (r N[B]) m() { }; var f = N[int].m`, `m`, `func (generic_m1.N[int]).m()`},
{`package generic_m2; func _[A any](v interface{ m() A }) { v.m() }`, `m`, `func (interface).m() A`},
{`package generic_m3; func f[A any]() interface{ m() A } { return nil }; var _ = f[int]().m()`, `m`, `func (interface).m() int`},
{`package generic_m4; type T[A any] func() interface{ m() A }; var x T[int]; var y = x().m`, `m`, `func (interface).m() int`},
{`package generic_m5; type T[A any] interface{ m() A }; func _[B any](t T[B]) { t.m() }`, `m`, `func (generic_m5.T[B]).m() B`},
{`package generic_m6; type T[A any] interface{ m() }; func _[B any](t T[B]) { t.m() }`, `m`, `func (generic_m6.T[B]).m()`},
{`package generic_m7; type T[A any] interface{ m() A }; func _(t T[int]) { t.m() }`, `m`, `func (generic_m7.T[int]).m() int`},
{`package generic_m8; type T[A any] interface{ m() }; func _(t T[int]) { t.m() }`, `m`, `func (generic_m8.T[int]).m()`},
{`package generic_m9; type T[A any] interface{ m() }; func _(t T[int]) { _ = t.m }`, `m`, `func (generic_m9.T[int]).m()`},
{
`package generic_m10; type E[A any] interface{ m() }; type T[B any] interface{ E[B]; n() }; func _(t T[int]) { t.m() }`,
`m`,
`func (generic_m10.E[int]).m()`,
},
}
for _, test := range tests {
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 {
if use != nil {
panic(fmt.Sprintf("multiple uses of %q", id.Name))
}
use = obj
}
}
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 TestGenericMethodInfo(t *testing.T) {
src := `package p
type N[A any] int
func (r N[B]) m() { r.m(); r.n() }
func (r *N[C]) n() { }
`
fset := token.NewFileSet()
f, err := parser.ParseFile(fset, "p.go", src, 0)
if err != nil {
t.Fatal(err)
}
info := Info{
Defs: make(map[*ast.Ident]Object),
Uses: make(map[*ast.Ident]Object),
Selections: make(map[*ast.SelectorExpr]*Selection),
}
var conf Config
pkg, err := conf.Check("p", fset, []*ast.File{f}, &info)
if err != nil {
t.Fatal(err)
}
N := pkg.Scope().Lookup("N").Type().(*Named)
// Find the generic methods stored on N.
gm, gn := N.Method(0), N.Method(1)
if gm.Name() == "n" {
gm, gn = gn, gm
}
// Collect objects from info.
var dm, dn *Func // the declared methods
var dmm, dmn *Func // the methods used in the body of m
for _, decl := range f.Decls {
fdecl, ok := decl.(*ast.FuncDecl)
if !ok {
continue
}
def := info.Defs[fdecl.Name].(*Func)
switch fdecl.Name.Name {
case "m":
dm = def
ast.Inspect(fdecl.Body, func(n ast.Node) bool {
if call, ok := n.(*ast.CallExpr); ok {
sel := call.Fun.(*ast.SelectorExpr)
use := info.Uses[sel.Sel].(*Func)
selection := info.Selections[sel]
if selection.Kind() != MethodVal {
t.Errorf("Selection kind = %v, want %v", selection.Kind(), MethodVal)
}
if selection.Obj() != use {
t.Errorf("info.Selections contains %v, want %v", selection.Obj(), use)
}
switch sel.Sel.Name {
case "m":
dmm = use
case "n":
dmn = use
}
}
return true
})
case "n":
dn = def
}
}
if gm != dm {
t.Errorf(`N.Method(...) returns %v for "m", but Info.Defs has %v`, gm, dm)
}
if gn != dn {
t.Errorf(`N.Method(...) returns %v for "m", but Info.Defs has %v`, gm, dm)
}
if dmm != dm {
t.Errorf(`Inside "m", r.m uses %v, want the defined func %v`, dmm, dm)
}
if dmn == dn {
t.Errorf(`Inside "m", r.n uses %v, want a func distinct from %v`, dmm, dm)
}
}
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"},
// Tests using generics.
{`package generic_f0; func f[T any](x int) {}`, ""}, // no Implicits entry
{`package generic_f1; func f[T any](int) {}`, "field: var int"},
{`package generic_f2; func f[T any](T) {}`, "field: var T"},
{`package generic_f3; func f[T any]() (complex64) { return 0 }`, "field: var complex64"},
{`package generic_f4; func f[T any](t T) (T) { return t }`, "field: var T"},
{`package generic_t0; type T[A any] struct{}; func (*T[_]) f() {}`, "field: var *generic_t0.T[_]"},
{`package generic_t1; type T[A any] struct{}; func _(x interface{}) { switch t := x.(type) { case T[int]: _ = t } }`, "caseClause: var t generic_t1.T[int]"},
{`package generic_t2; type T[A any] struct{}; func _[P any](x interface{}) { switch t := x.(type) { case T[P]: _ = t } }`, "caseClause: var t generic_t2.T[P]"},
{`package generic_t3; func _[P any](x interface{}) { switch t := x.(type) { case P: _ = t } }`, "caseClause: var t P"},
}
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>`},