go issues_test 源码
golang issues_test 代码
文件路径：/src/cmd/compile/internal/types2/issues_test.go
// 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.
// This file implements tests for various issues.
package types2_test
import (
"bytes"
"cmd/compile/internal/syntax"
"fmt"
"internal/testenv"
"sort"
"strings"
"testing"
. "cmd/compile/internal/types2"
)
func mustParse(t *testing.T, src string) *syntax.File {
f, err := parseSrc("", src)
if err != nil {
t.Fatal(err)
}
return f
}
func TestIssue5770(t *testing.T) {
f := mustParse(t, `package p; type S struct{T}`)
var conf Config
_, err := conf.Check(f.PkgName.Value, []*syntax.File{f}, nil) // do not crash
want := "undeclared name: T"
if err == nil || !strings.Contains(err.Error(), want) {
t.Errorf("got: %v; want: %s", err, want)
}
}
func TestIssue5849(t *testing.T) {
src := `
package p
var (
s uint
_ = uint8(8)
_ = uint16(16) << s
_ = uint32(32 << s)
_ = uint64(64 << s + s)
_ = (interface{})("foo")
_ = (interface{})(nil)
)`
f := mustParse(t, src)
var conf Config
types := make(map[syntax.Expr]TypeAndValue)
_, err := conf.Check(f.PkgName.Value, []*syntax.File{f}, &Info{Types: types})
if err != nil {
t.Fatal(err)
}
for x, tv := range types {
var want Type
switch x := x.(type) {
case *syntax.BasicLit:
switch x.Value {
case `8`:
want = Typ[Uint8]
case `16`:
want = Typ[Uint16]
case `32`:
want = Typ[Uint32]
case `64`:
want = Typ[Uint] // because of "+ s", s is of type uint
case `"foo"`:
want = Typ[String]
}
case *syntax.Name:
if x.Value == "nil" {
want = NewInterfaceType(nil, nil) // interface{} (for now, go/types types this as "untyped nil")
}
}
if want != nil && !Identical(tv.Type, want) {
t.Errorf("got %s; want %s", tv.Type, want)
}
}
}
func TestIssue6413(t *testing.T) {
src := `
package p
func f() int {
defer f()
go f()
return 0
}
`
f := mustParse(t, src)
var conf Config
types := make(map[syntax.Expr]TypeAndValue)
_, err := conf.Check(f.PkgName.Value, []*syntax.File{f}, &Info{Types: types})
if err != nil {
t.Fatal(err)
}
want := Typ[Int]
n := 0
for x, tv := range types {
if _, ok := x.(*syntax.CallExpr); ok {
if tv.Type != want {
t.Errorf("%s: got %s; want %s", x.Pos(), tv.Type, want)
}
n++
}
}
if n != 2 {
t.Errorf("got %d CallExprs; want 2", n)
}
}
func TestIssue7245(t *testing.T) {
src := `
package p
func (T) m() (res bool) { return }
type T struct{} // receiver type after method declaration
`
f := mustParse(t, src)
var conf Config
defs := make(map[*syntax.Name]Object)
_, err := conf.Check(f.PkgName.Value, []*syntax.File{f}, &Info{Defs: defs})
if err != nil {
t.Fatal(err)
}
m := f.DeclList[0].(*syntax.FuncDecl)
res1 := defs[m.Name].(*Func).Type().(*Signature).Results().At(0)
res2 := defs[m.Type.ResultList[0].Name].(*Var)
if res1 != res2 {
t.Errorf("got %s (%p) != %s (%p)", res1, res2, res1, res2)
}
}
// This tests that uses of existing vars on the LHS of an assignment
// are Uses, not Defs; and also that the (illegal) use of a non-var on
// the LHS of an assignment is a Use nonetheless.
func TestIssue7827(t *testing.T) {
const src = `
package p
func _() {
const w = 1 // defs w
x, y := 2, 3 // defs x, y
w, x, z := 4, 5, 6 // uses w, x, defs z; error: cannot assign to w
_, _, _ = x, y, z // uses x, y, z
}
`
f := mustParse(t, src)
const want = `L3 defs func p._()
L4 defs const w untyped int
L5 defs var x int
L5 defs var y int
L6 defs var z int
L6 uses const w untyped int
L6 uses var x int
L7 uses var x int
L7 uses var y int
L7 uses var z int`
// don't abort at the first error
conf := Config{Error: func(err error) { t.Log(err) }}
defs := make(map[*syntax.Name]Object)
uses := make(map[*syntax.Name]Object)
_, err := conf.Check(f.PkgName.Value, []*syntax.File{f}, &Info{Defs: defs, Uses: uses})
if s := fmt.Sprint(err); !strings.HasSuffix(s, "cannot assign to w") {
t.Errorf("Check: unexpected error: %s", s)
}
var facts []string
for id, obj := range defs {
if obj != nil {
fact := fmt.Sprintf("L%d defs %s", id.Pos().Line(), obj)
facts = append(facts, fact)
}
}
for id, obj := range uses {
fact := fmt.Sprintf("L%d uses %s", id.Pos().Line(), obj)
facts = append(facts, fact)
}
sort.Strings(facts)
got := strings.Join(facts, "\n")
if got != want {
t.Errorf("Unexpected defs/uses\ngot:\n%s\nwant:\n%s", got, want)
}
}
// This tests that the package associated with the types2.Object.Pkg method
// is the type's package independent of the order in which the imports are
// listed in the sources src1, src2 below.
// The actual issue is in go/internal/gcimporter which has a corresponding
// test; we leave this test here to verify correct behavior at the go/types
// level.
func TestIssue13898(t *testing.T) {
testenv.MustHaveGoBuild(t)
const src0 = `
package main
import "go/types"
func main() {
var info types.Info
for _, obj := range info.Uses {
_ = obj.Pkg()
}
}
`
// like src0, but also imports go/importer
const src1 = `
package main
import (
"go/types"
_ "go/importer"
)
func main() {
var info types.Info
for _, obj := range info.Uses {
_ = obj.Pkg()
}
}
`
// like src1 but with different import order
// (used to fail with this issue)
const src2 = `
package main
import (
_ "go/importer"
"go/types"
)
func main() {
var info types.Info
for _, obj := range info.Uses {
_ = obj.Pkg()
}
}
`
f := func(test, src string) {
f := mustParse(t, src)
conf := Config{Importer: defaultImporter()}
info := Info{Uses: make(map[*syntax.Name]Object)}
_, err := conf.Check("main", []*syntax.File{f}, &info)
if err != nil {
t.Fatal(err)
}
var pkg *Package
count := 0
for id, obj := range info.Uses {
if id.Value == "Pkg" {
pkg = obj.Pkg()
count++
}
}
if count != 1 {
t.Fatalf("%s: got %d entries named Pkg; want 1", test, count)
}
if pkg.Name() != "types" {
t.Fatalf("%s: got %v; want package types2", test, pkg)
}
}
f("src0", src0)
f("src1", src1)
f("src2", src2)
}
func TestIssue22525(t *testing.T) {
f := mustParse(t, `package p; func f() { var a, b, c, d, e int }`)
got := "\n"
conf := Config{Error: func(err error) { got += err.Error() + "\n" }}
conf.Check(f.PkgName.Value, []*syntax.File{f}, nil) // do not crash
want := `
:1:27: a declared but not used
:1:30: b declared but not used
:1:33: c declared but not used
:1:36: d declared but not used
:1:39: e declared but not used
`
if got != want {
t.Errorf("got: %swant: %s", got, want)
}
}
func TestIssue25627(t *testing.T) {
const prefix = `package p; import "unsafe"; type P *struct{}; type I interface{}; type T `
// The src strings (without prefix) are constructed such that the number of semicolons
// plus one corresponds to the number of fields expected in the respective struct.
for _, src := range []string{
`struct { x Missing }`,
`struct { Missing }`,
`struct { *Missing }`,
`struct { unsafe.Pointer }`,
`struct { P }`,
`struct { *I }`,
`struct { a int; b Missing; *Missing }`,
} {
f := mustParse(t, prefix+src)
conf := Config{Importer: defaultImporter(), Error: func(err error) {}}
info := &Info{Types: make(map[syntax.Expr]TypeAndValue)}
_, err := conf.Check(f.PkgName.Value, []*syntax.File{f}, info)
if err != nil {
if _, ok := err.(Error); !ok {
t.Fatal(err)
}
}
syntax.Crawl(f, func(n syntax.Node) bool {
if decl, _ := n.(*syntax.TypeDecl); decl != nil {
if tv, ok := info.Types[decl.Type]; ok && decl.Name.Value == "T" {
want := strings.Count(src, ";") + 1
if got := tv.Type.(*Struct).NumFields(); got != want {
t.Errorf("%s: got %d fields; want %d", src, got, want)
}
}
}
return false
})
}
}
func TestIssue28005(t *testing.T) {
// method names must match defining interface name for this test
// (see last comment in this function)
sources := [...]string{
"package p; type A interface{ A() }",
"package p; type B interface{ B() }",
"package p; type X interface{ A; B }",
}
// compute original file ASTs
var orig [len(sources)]*syntax.File
for i, src := range sources {
orig[i] = mustParse(t, src)
}
// run the test for all order permutations of the incoming files
for _, perm := range [][len(sources)]int{
{0, 1, 2},
{0, 2, 1},
{1, 0, 2},
{1, 2, 0},
{2, 0, 1},
{2, 1, 0},
} {
// create file order permutation
files := make([]*syntax.File, len(sources))
for i := range perm {
files[i] = orig[perm[i]]
}
// type-check package with given file order permutation
var conf Config
info := &Info{Defs: make(map[*syntax.Name]Object)}
_, err := conf.Check("", files, info)
if err != nil {
t.Fatal(err)
}
// look for interface object X
var obj Object
for name, def := range info.Defs {
if name.Value == "X" {
obj = def
break
}
}
if obj == nil {
t.Fatal("object X not found")
}
iface := obj.Type().Underlying().(*Interface) // object X must be an interface
// Each iface method m is embedded; and m's receiver base type name
// must match the method's name per the choice in the source file.
for i := 0; i < iface.NumMethods(); i++ {
m := iface.Method(i)
recvName := m.Type().(*Signature).Recv().Type().(*Named).Obj().Name()
if recvName != m.Name() {
t.Errorf("perm %v: got recv %s; want %s", perm, recvName, m.Name())
}
}
}
}
func TestIssue28282(t *testing.T) {
// create type interface { error }
et := Universe.Lookup("error").Type()
it := NewInterfaceType(nil, []Type{et})
// verify that after completing the interface, the embedded method remains unchanged
// (interfaces are "completed" lazily now, so the completion happens implicitly when
// accessing Method(0))
want := et.Underlying().(*Interface).Method(0)
got := it.Method(0)
if got != want {
t.Fatalf("%s.Method(0): got %q (%p); want %q (%p)", it, got, got, want, want)
}
// verify that lookup finds the same method in both interfaces (redundant check)
obj, _, _ := LookupFieldOrMethod(et, false, nil, "Error")
if obj != want {
t.Fatalf("%s.Lookup: got %q (%p); want %q (%p)", et, obj, obj, want, want)
}
obj, _, _ = LookupFieldOrMethod(it, false, nil, "Error")
if obj != want {
t.Fatalf("%s.Lookup: got %q (%p); want %q (%p)", it, obj, obj, want, want)
}
}
func TestIssue29029(t *testing.T) {
f1 := mustParse(t, `package p; type A interface { M() }`)
f2 := mustParse(t, `package p; var B interface { A }`)
// printInfo prints the *Func definitions recorded in info, one *Func per line.
printInfo := func(info *Info) string {
var buf bytes.Buffer
for _, obj := range info.Defs {
if fn, ok := obj.(*Func); ok {
fmt.Fprintln(&buf, fn)
}
}
return buf.String()
}
// The *Func (method) definitions for package p must be the same
// independent on whether f1 and f2 are type-checked together, or
// incrementally.
// type-check together
var conf Config
info := &Info{Defs: make(map[*syntax.Name]Object)}
check := NewChecker(&conf, NewPackage("", "p"), info)
if err := check.Files([]*syntax.File{f1, f2}); err != nil {
t.Fatal(err)
}
want := printInfo(info)
// type-check incrementally
info = &Info{Defs: make(map[*syntax.Name]Object)}
check = NewChecker(&conf, NewPackage("", "p"), info)
if err := check.Files([]*syntax.File{f1}); err != nil {
t.Fatal(err)
}
if err := check.Files([]*syntax.File{f2}); err != nil {
t.Fatal(err)
}
got := printInfo(info)
if got != want {
t.Errorf("\ngot : %swant: %s", got, want)
}
}
func TestIssue34151(t *testing.T) {
const asrc = `package a; type I interface{ M() }; type T struct { F interface { I } }`
const bsrc = `package b; import "a"; type T struct { F interface { a.I } }; var _ = a.T(T{})`
a, err := pkgFor("a", asrc, nil)
if err != nil {
t.Fatalf("package %s failed to typecheck: %v", a.Name(), err)
}
bast := mustParse(t, bsrc)
conf := Config{Importer: importHelper{pkg: a}}
b, err := conf.Check(bast.PkgName.Value, []*syntax.File{bast}, nil)
if err != nil {
t.Errorf("package %s failed to typecheck: %v", b.Name(), err)
}
}
type importHelper struct {
pkg *Package
fallback Importer
}
func (h importHelper) Import(path string) (*Package, error) {
if path == h.pkg.Path() {
return h.pkg, nil
}
if h.fallback == nil {
return nil, fmt.Errorf("got package path %q; want %q", path, h.pkg.Path())
}
return h.fallback.Import(path)
}
// TestIssue34921 verifies that we don't update an imported type's underlying
// type when resolving an underlying type. Specifically, when determining the
// underlying type of b.T (which is the underlying type of a.T, which is int)
// we must not set the underlying type of a.T again since that would lead to
// a race condition if package b is imported elsewhere, in a package that is
// concurrently type-checked.
func TestIssue34921(t *testing.T) {
defer func() {
if r := recover(); r != nil {
t.Error(r)
}
}()
var sources = []string{
`package a; type T int`,
`package b; import "a"; type T a.T`,
}
var pkg *Package
for _, src := range sources {
f := mustParse(t, src)
conf := Config{Importer: importHelper{pkg: pkg}}
res, err := conf.Check(f.PkgName.Value, []*syntax.File{f}, nil)
if err != nil {
t.Errorf("%q failed to typecheck: %v", src, err)
}
pkg = res // res is imported by the next package in this test
}
}
func TestIssue43088(t *testing.T) {
// type T1 struct {
// _ T2
// }
//
// type T2 struct {
// _ struct {
// _ T2
// }
// }
n1 := NewTypeName(syntax.Pos{}, nil, "T1", nil)
T1 := NewNamed(n1, nil, nil)
n2 := NewTypeName(syntax.Pos{}, nil, "T2", nil)
T2 := NewNamed(n2, nil, nil)
s1 := NewStruct([]*Var{NewField(syntax.Pos{}, nil, "_", T2, false)}, nil)
T1.SetUnderlying(s1)
s2 := NewStruct([]*Var{NewField(syntax.Pos{}, nil, "_", T2, false)}, nil)
s3 := NewStruct([]*Var{NewField(syntax.Pos{}, nil, "_", s2, false)}, nil)
T2.SetUnderlying(s3)
// These calls must terminate (no endless recursion).
Comparable(T1)
Comparable(T2)
}
func TestIssue44515(t *testing.T) {
typ := Unsafe.Scope().Lookup("Pointer").Type()
got := TypeString(typ, nil)
want := "unsafe.Pointer"
if got != want {
t.Errorf("got %q; want %q", got, want)
}
qf := func(pkg *Package) string {
if pkg == Unsafe {
return "foo"
}
return ""
}
got = TypeString(typ, qf)
want = "foo.Pointer"
if got != want {
t.Errorf("got %q; want %q", got, want)
}
}
func TestIssue43124(t *testing.T) {
// All involved packages have the same name (template). Error messages should
// disambiguate between text/template and html/template by printing the full
// path.
const (
asrc = `package a; import "text/template"; func F(template.Template) {}; func G(int) {}`
bsrc = `package b; import ("a"; "html/template"); func _() { a.F(template.Template{}) }`
csrc = `package c; import ("a"; "html/template"); func _() { a.G(template.Template{}) }`
)
a, err := pkgFor("a", asrc, nil)
if err != nil {
t.Fatalf("package a failed to typecheck: %v", err)
}
conf := Config{Importer: importHelper{pkg: a, fallback: defaultImporter()}}
// Packages should be fully qualified when there is ambiguity within the
// error string itself.
bast := mustParse(t, bsrc)
_, err = conf.Check(bast.PkgName.Value, []*syntax.File{bast}, nil)
if err == nil {
t.Fatal("package b had no errors")
}
if !strings.Contains(err.Error(), "text/template") || !strings.Contains(err.Error(), "html/template") {
t.Errorf("type checking error for b does not disambiguate package template: %q", err)
}
// ...and also when there is any ambiguity in reachable packages.
cast := mustParse(t, csrc)
_, err = conf.Check(cast.PkgName.Value, []*syntax.File{cast}, nil)
if err == nil {
t.Fatal("package c had no errors")
}
if !strings.Contains(err.Error(), "html/template") {
t.Errorf("type checking error for c does not disambiguate package template: %q", err)
}
}
func TestIssue50646(t *testing.T) {
anyType := Universe.Lookup("any").Type()
comparableType := Universe.Lookup("comparable").Type()
if !Comparable(anyType) {
t.Errorf("any is not a comparable type")
}
if !Comparable(comparableType) {
t.Errorf("comparable is not a comparable type")
}
if Implements(anyType, comparableType.Underlying().(*Interface)) {
t.Errorf("any implements comparable")
}
if !Implements(comparableType, anyType.(*Interface)) {
t.Errorf("comparable does not implement any")
}
if AssignableTo(anyType, comparableType) {
t.Errorf("any assignable to comparable")
}
if !AssignableTo(comparableType, anyType) {
t.Errorf("comparable not assignable to any")
}
}
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