blob: c9471fb7e26769f37759ba3e0291e7d24b34fc5c [file] [log] [blame]
// 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/parser"
"go/token"
"strings"
"testing"
_ "llvm.org/llgo/third_party/gotools/go/gcimporter"
. "llvm.org/llgo/third_party/gotools/go/types"
)
func pkgFor(path, source string, info *Info) (*Package, error) {
fset := token.NewFileSet()
f, err := parser.ParseFile(fset, path, source, 0)
if err != nil {
return nil, err
}
var conf Config
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()
}
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`},
{`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`},
{`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`},
{`package c4b; var _ = complex64(0i)`, `complex64(0i)`, `complex64`, `0`},
{`package c4c; type T complex64; var _ = T(0i)`, `T(0i)`, `c4c.T`, `0`},
{`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 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`},
{`package e5; const _ = complex64(-1e-200)`, `complex64(-1e-200)`, `complex64`, `0`},
{`package e6; const _ = complex128( 1e-2000)`, `complex128(1e-2000)`, `complex128`, `0`},
{`package e7; const _ = complex128(-1e-2000)`, `complex128(-1e-2000)`, `complex128`, `0`},
{`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`},
{`package f5 ; var _ complex64 = -1e-200 `, `-1e-200`, `complex64`, `0`},
{`package f6a; var _ complex128 = 1e-2000i`, `1e-2000i`, `complex128`, `0`},
{`package f7a; var _ complex128 = -1e-2000i`, `-1e-2000i`, `complex128`, `0`},
{`package f6b; var _ = 1e-2000i`, `1e-2000i`, `complex128`, `0`},
{`package f7b; var _ = -1e-2000i`, `-1e-2000i`, `complex128`, `0`},
}
for _, test := range tests {
info := Info{
Types: make(map[ast.Expr]TypeAndValue),
}
name := mustTypecheck(t, "ValuesInfo", test.src, &info)
// look for constant 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
}
// check that value is correct
if got := tv.Value.String(); got != test.val {
t.Errorf("package %s: got value %s; want %s", name, got, test.val)
}
}
}
func TestTypesInfo(t *testing.T) {
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`},
// 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)`,
},
// TODO(gri): uncomment if we accept issue 8189.
// {`package p2; type mybool bool; var m map[string]complex128; var b mybool; func _() { _, b = m["foo"] }`,
// `m["foo"]`,
// `(complex128, p2.mybool)`,
// },
// TODO(gri): remove if we accept issue 8189.
{`package p2; 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)`,
},
}
for _, test := range tests {
info := Info{Types: make(map[ast.Expr]TypeAndValue)}
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 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) {
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`},
// 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) {
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()",
}},
}
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)
}
}
func TestSelection(t *testing.T) {
selections := make(map[*ast.SelectorExpr]*Selection)
fset := token.NewFileSet()
conf := Config{
Packages: make(map[string]*Package),
Import: func(imports map[string]*Package, path string) (*Package, error) {
return imports[path], nil
},
}
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)
}
conf.Packages[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()
conf := Config{
Packages: make(map[string]*Package),
Error: func(err error) { t.Log(err) }, // don't exit after first error
Import: func(imports map[string]*Package, path string) (*Package, error) {
return imports[path], nil
},
}
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
conf.Packages[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) {
// 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).
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
}