/
api_test.go
2055 lines (1832 loc) · 61.4 KB
/
api_test.go
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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"
"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 {
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
{`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.`, `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[generic_p0.T₁ interface{}](generic_p0.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(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[generic_p4.T₁ interface{}](generic_p4.T₁)`},
{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[generic_t1.P₁ interface{}]`},
{genericPkg + `t2; type t[P interface{}] int; var _ t[int]`, `t`, `generic_t2.t[generic_t2.P₁ interface{}]`},
{genericPkg + `t3; type t[P, Q interface{}] int; var _ t[int, int]`, `t`, `generic_t3.t[generic_t3.P₁, generic_t3.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{ ~int8 | ~int16 | ~int32 }](x T) { _ = x < 0 }`, `0`, `generic_issue45096.T₁`},
// issue 47895
{`package p; import "unsafe"; type S struct { f int }; var s S; var _ = unsafe.Offsetof(s.f)`, `s.f`, `int`},
}
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) {
var tests = []struct {
src string
name string
targs []string
typ string
}{
{`package p0; func f[T any](T) {}; func _() { f(42) }`,
`f`,
[]string{`int`},
`func(int)`,
},
{`package p1; func f[T any](T) T { panic(0) }; func _() { f('@') }`,
`f`,
[]string{`rune`},
`func(rune) rune`,
},
{`package p2; func f[T any](...T) T { panic(0) }; func _() { f(0i) }`,
`f`,
[]string{`complex128`},
`func(...complex128) complex128`,
},
{`package p3; func f[A, B, C any](A, *B, []C) {}; func _() { f(1.2, new(string), []byte{}) }`,
`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)) }`,
`f`,
[]string{`float64`, `byte`},
`func(float64, *byte, ...[]byte)`,
},
{`package s1; func f[T any, P interface{~*T}](x T) {}; func _(x string) { f(x) }`,
`f`,
[]string{`string`, `*string`},
`func(x string)`,
},
{`package s2; func f[T any, P interface{~*T}](x []T) {}; func _(x []int) { f(x) }`,
`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) }`,
`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) }`,
`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] }`,
`f`,
[]string{`string`, `*string`},
`func() string`,
},
{`package t2; func f[T any, P interface{~*T}]() T { panic(0) }; func _() { _ = (f[string]) }`,
`f`,
[]string{`string`, `*string`},
`func() string`,
},
{`package t3; type C[T any] interface{~chan<- T}; func f[T any, P C[T]]() []T { return nil }; func _() { _ = f[int] }`,
`f`,
[]string{`int`, `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] }`,
`f`,
[]string{`int`, `chan<- int`, `chan<- []*chan<- int`},
`func() []int`,
},
{`package i0; import "lib"; func _() { lib.F(42) }`,
`F`,
[]string{`int`},
`func(int)`,
},
{`package type0; type T[P interface{~int}] struct{ x P }; var _ T[int]`,
`T`,
[]string{`int`},
`struct{x int}`,
},
{`package type1; type T[P interface{~int}] struct{ x P }; var _ (T[int])`,
`T`,
[]string{`int`},
`struct{x int}`,
},
{`package type2; type T[P interface{~int}] struct{ x P }; var _ T[(int)]`,
`T`,
[]string{`int`},
`struct{x int}`,
},
{`package type3; type T[P1 interface{~[]P2}, P2 any] struct{ x P1; y P2 }; var _ T[[]int, int]`,
`T`,
[]string{`[]int`, `int`},
`struct{x []int; y int}`,
},
{`package type4; import "lib"; var _ lib.T[int]`,
`T`,
[]string{`int`},
`[]int`,
},
}
for _, test := range tests {
const lib = `package lib
func F[P any](P) {}
type T[P any] []P
`
imports := make(testImporter)
conf := Config{Importer: imports}
instances := make(map[*ast.Ident]Instance)
uses := 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: instances, Uses: uses})
if err != nil {
t.Fatal(err)
}
imports[pkg.Name()] = pkg
return pkg
}
makePkg(lib)
pkg := makePkg(test.src)
// look for instance information
var targs []Type
var typ Type
for ident, inst := range instances {
if ExprString(ident) == test.name {
for i := 0; i < inst.TypeArgs.Len(); i++ {
targs = append(targs, inst.TypeArgs.At(i))
}
typ = inst.Type
// Check that we can find the corresponding parameterized type.
ptype := uses[ident].Type()
lister, _ := ptype.(interface{ TypeParams() *TypeParamList })
if lister == nil || lister.TypeParams().Len() == 0 {
t.Errorf("package %s: info.Types[%v] = %v, want parameterized type", pkg.Name(), ident, ptype)
continue
}
// Verify the invariant that re-instantiating the generic type with
// TypeArgs results in an equivalent type.
inst2, err := Instantiate(nil, ptype, targs, true)
if err != nil {
t.Errorf("Instantiate(%v, %v) failed: %v", ptype, targs, err)
}
if !Identical(inst.Type, inst2) {
t.Errorf("%v and %v are not identical", inst.Type, inst2)
}
break
}
}
if targs == nil {
t.Errorf("package %s: no instance information found for %s", pkg.Name(), test.name)
continue
}
// check that type arguments are correct
if len(targs) != len(test.targs) {
t.Errorf("package %s: got %d type arguments; want %d", pkg.Name(), len(targs), len(test.targs))
continue
}
for i, targ := range targs {
if got := targ.String(); got != test.targs[i] {
t.Errorf("package %s, %d. type argument: got %s; want %s", pkg.Name(), i, got, test.targs[i])
continue
}
}
// check that the types match
if got := typ.Underlying().String(); got != test.typ {
t.Errorf("package %s: got %s; want %s", pkg.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 {
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 {
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",
}},