/third_party/gofrontend/libgo/go/go/types/api_test.go
Go | 1044 lines | 879 code | 94 blank | 71 comment | 131 complexity | 4dce6cb1f7fa549f5718ed4dfbf2b70e MD5 | raw file
Possible License(s): BSD-3-Clause, MIT
- // Copyright 2013 The Go Authors. All rights reserved.
- // Use of this source code is governed by a BSD-style
- // license that can be found in the LICENSE file.
- package types_test
- import (
- "bytes"
- "fmt"
- "go/ast"
- "go/importer"
- "go/parser"
- "go/token"
- "internal/testenv"
- "reflect"
- "regexp"
- "strings"
- "testing"
- . "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
- }
- 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()
- }
- 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) {
- 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`},
- // built-ins
- {`package b0; var _ = len("")`, `len`, `builtin`},
- {`package b1; var _ = (len)("")`, `(len)`, `builtin`},
- // constants
- {`package c0; var _ = 42`, `42`, `const`},
- {`package c1; var _ = "foo" + "bar"`, `"foo" + "bar"`, `const`},
- {`package c2; const (i = 1i; _ = i)`, `i`, `const`},
- // values
- {`package v0; var (a, b int; _ = a + b)`, `a + b`, `value`},
- {`package v1; var _ = &[]int{1}`, `([]int literal)`, `value`},
- {`package v2; var _ = func(){}`, `(func() literal)`, `value`},
- {`package v4; func f() { _ = f }`, `f`, `value`},
- {`package v3; var _ *int = nil`, `nil`, `value, nil`},
- {`package v3; var _ *int = (nil)`, `(nil)`, `value, nil`},
- // addressable (and thus assignable) operands
- {`package a0; var (x int; _ = x)`, `x`, `value, addressable, assignable`},
- {`package a1; var (p *int; _ = *p)`, `*p`, `value, addressable, assignable`},
- {`package a2; var (s []int; _ = s[0])`, `s[0]`, `value, addressable, assignable`},
- {`package a3; var (s struct{f int}; _ = s.f)`, `s.f`, `value, addressable, assignable`},
- {`package a4; var (a [10]int; _ = a[0])`, `a[0]`, `value, addressable, assignable`},
- {`package a5; func _(x int) { _ = x }`, `x`, `value, addressable, assignable`},
- {`package a6; func _()(x int) { _ = x; return }`, `x`, `value, addressable, assignable`},
- {`package a7; type T int; func (x T) _() { _ = x }`, `x`, `value, addressable, assignable`},
- // composite literals are not addressable
- // assignable but not addressable values
- {`package s0; var (m map[int]int; _ = m[0])`, `m[0]`, `value, assignable, hasOk`},
- {`package s1; var (m map[int]int; _, _ = m[0])`, `m[0]`, `value, assignable, hasOk`},
- // hasOk expressions
- {`package k0; var (ch chan int; _ = <-ch)`, `<-ch`, `value, hasOk`},
- {`package k1; var (ch chan int; _, _ = <-ch)`, `<-ch`, `value, hasOk`},
- // missing entries
- // - package names are collected in the Uses map
- // - identifiers being declared are collected in the Defs map
- {`package m0; import "os"; func _() { _ = os.Stdout }`, `os`, `<missing>`},
- {`package m1; import p "os"; func _() { _ = p.Stdout }`, `p`, `<missing>`},
- {`package m2; const c = 0`, `c`, `<missing>`},
- {`package m3; type T int`, `T`, `<missing>`},
- {`package m4; var v int`, `v`, `<missing>`},
- {`package m5; func f() {}`, `f`, `<missing>`},
- {`package m6; func _(x int) {}`, `x`, `<missing>`},
- {`package m6; func _()(x int) { return }`, `x`, `<missing>`},
- {`package m6; type T int; func (x T) _() {}`, `x`, `<missing>`},
- }
- for _, test := range tests {
- info := Info{Types: make(map[ast.Expr]TypeAndValue)}
- name := mustTypecheck(t, "PredicatesInfo", test.src, &info)
- // look for expression predicates
- got := "<missing>"
- for e, tv := range info.Types {
- //println(name, ExprString(e))
- if ExprString(e) == test.expr {
- got = predString(tv)
- break
- }
- }
- if got != test.pred {
- t.Errorf("package %s: got %s; want %s", name, got, test.pred)
- }
- }
- }
- func TestScopesInfo(t *testing.T) {
- testenv.MustHaveGoBuild(t)
- var tests = []struct {
- src string
- scopes []string // list of scope descriptors of the form kind:varlist
- }{
- {`package p0`, []string{
- "file:",
- }},
- {`package p1; import ( "fmt"; m "math"; _ "os" ); var ( _ = fmt.Println; _ = m.Pi )`, []string{
- "file:fmt m",
- }},
- {`package p2; func _() {}`, []string{
- "file:", "func:",
- }},
- {`package p3; func _(x, y int) {}`, []string{
- "file:", "func:x y",
- }},
- {`package p4; func _(x, y int) { x, z := 1, 2; _ = z }`, []string{
- "file:", "func:x y z", // redeclaration of x
- }},
- {`package p5; func _(x, y int) (u, _ int) { return }`, []string{
- "file:", "func:u x y",
- }},
- {`package p6; func _() { { var x int; _ = x } }`, []string{
- "file:", "func:", "block:x",
- }},
- {`package p7; func _() { if true {} }`, []string{
- "file:", "func:", "if:", "block:",
- }},
- {`package p8; func _() { if x := 0; x < 0 { y := x; _ = y } }`, []string{
- "file:", "func:", "if:x", "block:y",
- }},
- {`package p9; func _() { switch x := 0; x {} }`, []string{
- "file:", "func:", "switch:x",
- }},
- {`package p10; func _() { switch x := 0; x { case 1: y := x; _ = y; default: }}`, []string{
- "file:", "func:", "switch:x", "case:y", "case:",
- }},
- {`package p11; func _(t interface{}) { switch t.(type) {} }`, []string{
- "file:", "func:t", "type switch:",
- }},
- {`package p12; func _(t interface{}) { switch t := t; t.(type) {} }`, []string{
- "file:", "func:t", "type switch:t",
- }},
- {`package p13; func _(t interface{}) { switch x := t.(type) { case int: _ = x } }`, []string{
- "file:", "func:t", "type switch:", "case:x", // x implicitly declared
- }},
- {`package p14; func _() { select{} }`, []string{
- "file:", "func:",
- }},
- {`package p15; func _(c chan int) { select{ case <-c: } }`, []string{
- "file:", "func:c", "comm:",
- }},
- {`package p16; func _(c chan int) { select{ case i := <-c: x := i; _ = x} }`, []string{
- "file:", "func:c", "comm:i x",
- }},
- {`package p17; func _() { for{} }`, []string{
- "file:", "func:", "for:", "block:",
- }},
- {`package p18; func _(n int) { for i := 0; i < n; i++ { _ = i } }`, []string{
- "file:", "func:n", "for:i", "block:",
- }},
- {`package p19; func _(a []int) { for i := range a { _ = i} }`, []string{
- "file:", "func:a", "range:i", "block:",
- }},
- {`package p20; var s int; func _(a []int) { for i, x := range a { s += x; _ = i } }`, []string{
- "file:", "func:a", "range:i x", "block:",
- }},
- }
- for _, test := range tests {
- info := Info{Scopes: make(map[ast.Node]*Scope)}
- name := mustTypecheck(t, "ScopesInfo", test.src, &info)
- // number of scopes must match
- if len(info.Scopes) != len(test.scopes) {
- t.Errorf("package %s: got %d scopes; want %d", name, len(info.Scopes), len(test.scopes))
- }
- // scope descriptions must match
- for node, scope := range info.Scopes {
- kind := "<unknown node kind>"
- switch node.(type) {
- case *ast.File:
- kind = "file"
- case *ast.FuncType:
- kind = "func"
- case *ast.BlockStmt:
- kind = "block"
- case *ast.IfStmt:
- kind = "if"
- case *ast.SwitchStmt:
- kind = "switch"
- case *ast.TypeSwitchStmt:
- kind = "type switch"
- case *ast.CaseClause:
- kind = "case"
- case *ast.CommClause:
- kind = "comm"
- case *ast.ForStmt:
- kind = "for"
- case *ast.RangeStmt:
- kind = "range"
- }
- // look for matching scope description
- desc := kind + ":" + strings.Join(scope.Names(), " ")
- found := false
- for _, d := range test.scopes {
- if desc == d {
- found = true
- break
- }
- }
- if !found {
- t.Errorf("package %s: no matching scope found for %s", name, desc)
- }
- }
- }
- }
- func TestInitOrderInfo(t *testing.T) {
- var tests = []struct {
- src string
- inits []string
- }{
- {`package p0; var (x = 1; y = x)`, []string{
- "x = 1", "y = x",
- }},
- {`package p1; var (a = 1; b = 2; c = 3)`, []string{
- "a = 1", "b = 2", "c = 3",
- }},
- {`package p2; var (a, b, c = 1, 2, 3)`, []string{
- "a = 1", "b = 2", "c = 3",
- }},
- {`package p3; var _ = f(); func f() int { return 1 }`, []string{
- "_ = f()", // blank var
- }},
- {`package p4; var (a = 0; x = y; y = z; z = 0)`, []string{
- "a = 0", "z = 0", "y = z", "x = y",
- }},
- {`package p5; var (a, _ = m[0]; m map[int]string)`, []string{
- "a, _ = m[0]", // blank var
- }},
- {`package p6; var a, b = f(); func f() (_, _ int) { return z, z }; var z = 0`, []string{
- "z = 0", "a, b = f()",
- }},
- {`package p7; var (a = func() int { return b }(); b = 1)`, []string{
- "b = 1", "a = (func() int literal)()",
- }},
- {`package p8; var (a, b = func() (_, _ int) { return c, c }(); c = 1)`, []string{
- "c = 1", "a, b = (func() (_, _ int) literal)()",
- }},
- {`package p9; type T struct{}; func (T) m() int { _ = y; return 0 }; var x, y = T.m, 1`, []string{
- "y = 1", "x = T.m",
- }},
- {`package p10; var (d = c + b; a = 0; b = 0; c = 0)`, []string{
- "a = 0", "b = 0", "c = 0", "d = c + b",
- }},
- {`package p11; var (a = e + c; b = d + c; c = 0; d = 0; e = 0)`, []string{
- "c = 0", "d = 0", "b = d + c", "e = 0", "a = e + c",
- }},
- // emit an initializer for n:1 initializations only once (not for each node
- // on the lhs which may appear in different order in the dependency graph)
- {`package p12; var (a = x; b = 0; x, y = m[0]; m map[int]int)`, []string{
- "b = 0", "x, y = m[0]", "a = x",
- }},
- // test case from spec section on package initialization
- {`package p12
- var (
- a = c + b
- b = f()
- c = f()
- d = 3
- )
- func f() int {
- d++
- return d
- }`, []string{
- "d = 3", "b = f()", "c = f()", "a = c + b",
- }},
- // test case for issue 7131
- {`package main
- var counter int
- func next() int { counter++; return counter }
- var _ = makeOrder()
- func makeOrder() []int { return []int{f, b, d, e, c, a} }
- var a = next()
- var b, c = next(), next()
- var d, e, f = next(), next(), next()
- `, []string{
- "a = next()", "b = next()", "c = next()", "d = next()", "e = next()", "f = next()", "_ = makeOrder()",
- }},
- }
- for _, test := range tests {
- info := Info{}
- name := mustTypecheck(t, "InitOrderInfo", test.src, &info)
- // number of initializers must match
- if len(info.InitOrder) != len(test.inits) {
- t.Errorf("package %s: got %d initializers; want %d", name, len(info.InitOrder), len(test.inits))
- continue
- }
- // initializers must match
- for i, want := range test.inits {
- got := info.InitOrder[i].String()
- if got != want {
- t.Errorf("package %s, init %d: got %s; want %s", name, i, got, want)
- continue
- }
- }
- }
- }
- func TestMultiFileInitOrder(t *testing.T) {
- fset := token.NewFileSet()
- mustParse := func(src string) *ast.File {
- f, err := parser.ParseFile(fset, "main", src, 0)
- if err != nil {
- t.Fatal(err)
- }
- return f
- }
- fileA := mustParse(`package main; var a = 1`)
- fileB := mustParse(`package main; var b = 2`)
- // The initialization order must not depend on the parse
- // order of the files, only on the presentation order to
- // the type-checker.
- for _, test := range []struct {
- files []*ast.File
- want string
- }{
- {[]*ast.File{fileA, fileB}, "[a = 1 b = 2]"},
- {[]*ast.File{fileB, fileA}, "[b = 2 a = 1]"},
- } {
- var info Info
- if _, err := new(Config).Check("main", fset, test.files, &info); err != nil {
- t.Fatal(err)
- }
- if got := fmt.Sprint(info.InitOrder); got != test.want {
- t.Fatalf("got %s; want %s", got, test.want)
- }
- }
- }
- func TestFiles(t *testing.T) {
- var sources = []string{
- "package p; type T struct{}; func (T) m1() {}",
- "package p; func (T) m2() {}; var x interface{ m1(); m2() } = T{}",
- "package p; func (T) m3() {}; var y interface{ m1(); m2(); m3() } = T{}",
- "package p",
- }
- var conf Config
- fset := token.NewFileSet()
- pkg := NewPackage("p", "p")
- var info Info
- check := NewChecker(&conf, fset, pkg, &info)
- for i, src := range sources {
- filename := fmt.Sprintf("sources%d", i)
- f, err := parser.ParseFile(fset, filename, src, 0)
- if err != nil {
- t.Fatal(err)
- }
- if err := check.Files([]*ast.File{f}); err != nil {
- t.Error(err)
- }
- }
- // check InitOrder is [x y]
- var vars []string
- for _, init := range info.InitOrder {
- for _, v := range init.Lhs {
- vars = append(vars, v.Name())
- }
- }
- if got, want := fmt.Sprint(vars), "[x y]"; got != want {
- t.Errorf("InitOrder == %s, want %s", got, want)
- }
- }
- type testImporter map[string]*Package
- func (m testImporter) Import(path string) (*Package, error) {
- if pkg := m[path]; pkg != nil {
- return pkg, nil
- }
- return nil, fmt.Errorf("package %q not found", path)
- }
- func TestSelection(t *testing.T) {
- selections := make(map[*ast.SelectorExpr]*Selection)
- fset := token.NewFileSet()
- imports := make(testImporter)
- conf := Config{Importer: imports}
- makePkg := func(path, src string) {
- f, err := parser.ParseFile(fset, path+".go", src, 0)
- if err != nil {
- t.Fatal(err)
- }
- pkg, err := conf.Check(path, fset, []*ast.File{f}, &Info{Selections: selections})
- if err != nil {
- t.Fatal(err)
- }
- imports[path] = pkg
- }
- const libSrc = `
- package lib
- type T float64
- const C T = 3
- var V T
- func F() {}
- func (T) M() {}
- `
- const mainSrc = `
- package main
- import "lib"
- type A struct {
- *B
- C
- }
- type B struct {
- b int
- }
- func (B) f(int)
- type C struct {
- c int
- }
- func (C) g()
- func (*C) h()
- func main() {
- // qualified identifiers
- var _ lib.T
- _ = lib.C
- _ = lib.F
- _ = lib.V
- _ = lib.T.M
- // fields
- _ = A{}.B
- _ = new(A).B
- _ = A{}.C
- _ = new(A).C
- _ = A{}.b
- _ = new(A).b
- _ = A{}.c
- _ = new(A).c
- // methods
- _ = A{}.f
- _ = new(A).f
- _ = A{}.g
- _ = new(A).g
- _ = new(A).h
- _ = B{}.f
- _ = new(B).f
- _ = C{}.g
- _ = new(C).g
- _ = new(C).h
- // method expressions
- _ = A.f
- _ = (*A).f
- _ = B.f
- _ = (*B).f
- }`
- wantOut := map[string][2]string{
- "lib.T.M": {"method expr (lib.T) M(lib.T)", ".[0]"},
- "A{}.B": {"field (main.A) B *main.B", ".[0]"},
- "new(A).B": {"field (*main.A) B *main.B", "->[0]"},
- "A{}.C": {"field (main.A) C main.C", ".[1]"},
- "new(A).C": {"field (*main.A) C main.C", "->[1]"},
- "A{}.b": {"field (main.A) b int", "->[0 0]"},
- "new(A).b": {"field (*main.A) b int", "->[0 0]"},
- "A{}.c": {"field (main.A) c int", ".[1 0]"},
- "new(A).c": {"field (*main.A) c int", "->[1 0]"},
- "A{}.f": {"method (main.A) f(int)", "->[0 0]"},
- "new(A).f": {"method (*main.A) f(int)", "->[0 0]"},
- "A{}.g": {"method (main.A) g()", ".[1 0]"},
- "new(A).g": {"method (*main.A) g()", "->[1 0]"},
- "new(A).h": {"method (*main.A) h()", "->[1 1]"}, // TODO(gri) should this report .[1 1] ?
- "B{}.f": {"method (main.B) f(int)", ".[0]"},
- "new(B).f": {"method (*main.B) f(int)", "->[0]"},
- "C{}.g": {"method (main.C) g()", ".[0]"},
- "new(C).g": {"method (*main.C) g()", "->[0]"},
- "new(C).h": {"method (*main.C) h()", "->[1]"}, // TODO(gri) should this report .[1] ?
- "A.f": {"method expr (main.A) f(main.A, int)", "->[0 0]"},
- "(*A).f": {"method expr (*main.A) f(*main.A, int)", "->[0 0]"},
- "B.f": {"method expr (main.B) f(main.B, int)", ".[0]"},
- "(*B).f": {"method expr (*main.B) f(*main.B, int)", "->[0]"},
- }
- makePkg("lib", libSrc)
- makePkg("main", mainSrc)
- for e, sel := range selections {
- sel.String() // assertion: must not panic
- start := fset.Position(e.Pos()).Offset
- end := fset.Position(e.End()).Offset
- syntax := mainSrc[start:end] // (all SelectorExprs are in main, not lib)
- direct := "."
- if sel.Indirect() {
- direct = "->"
- }
- got := [2]string{
- sel.String(),
- fmt.Sprintf("%s%v", direct, sel.Index()),
- }
- want := wantOut[syntax]
- if want != got {
- t.Errorf("%s: got %q; want %q", syntax, got, want)
- }
- delete(wantOut, syntax)
- // We must explicitly assert properties of the
- // Signature's receiver since it doesn't participate
- // in Identical() or String().
- sig, _ := sel.Type().(*Signature)
- if sel.Kind() == MethodVal {
- got := sig.Recv().Type()
- want := sel.Recv()
- if !Identical(got, want) {
- t.Errorf("%s: Recv() = %s, want %s", syntax, got, want)
- }
- } else if sig != nil && sig.Recv() != nil {
- t.Errorf("%s: signature has receiver %s", sig, sig.Recv().Type())
- }
- }
- // Assert that all wantOut entries were used exactly once.
- for syntax := range wantOut {
- t.Errorf("no ast.Selection found with syntax %q", syntax)
- }
- }
- func TestIssue8518(t *testing.T) {
- fset := token.NewFileSet()
- imports := make(testImporter)
- conf := Config{
- Error: func(err error) { t.Log(err) }, // don't exit after first error
- Importer: imports,
- }
- makePkg := func(path, src string) {
- f, err := parser.ParseFile(fset, path, src, 0)
- if err != nil {
- t.Fatal(err)
- }
- pkg, _ := conf.Check(path, fset, []*ast.File{f}, nil) // errors logged via conf.Error
- imports[path] = pkg
- }
- const libSrc = `
- package a
- import "missing"
- const C1 = foo
- const C2 = missing.C
- `
- const mainSrc = `
- package main
- import "a"
- var _ = a.C1
- var _ = a.C2
- `
- makePkg("a", libSrc)
- makePkg("main", mainSrc) // don't crash when type-checking this package
- }
- func TestLookupFieldOrMethod(t *testing.T) {
- // 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
- }
- // TestScopeLookupParent ensures that (*Scope).LookupParent returns
- // the correct result at various positions with the source.
- func TestScopeLookupParent(t *testing.T) {
- fset := token.NewFileSet()
- imports := make(testImporter)
- conf := Config{Importer: imports}
- mustParse := func(src string) *ast.File {
- f, err := parser.ParseFile(fset, "dummy.go", src, parser.ParseComments)
- if err != nil {
- t.Fatal(err)
- }
- return f
- }
- var info Info
- makePkg := func(path string, files ...*ast.File) {
- imports[path], _ = conf.Check(path, fset, files, &info)
- }
- makePkg("lib", mustParse("package lib; var X int"))
- // Each /*name=kind:line*/ comment makes the test look up the
- // name at that point and checks that it resolves to a decl of
- // the specified kind and line number. "undef" means undefined.
- mainSrc := `
- package main
- import "lib"
- var Y = lib.X
- func f() {
- print(Y) /*Y=var:4*/
- z /*z=undef*/ := /*z=undef*/ 1 /*z=var:7*/
- print(z)
- /*f=func:5*/ /*lib=pkgname:3*/
- type /*T=undef*/ T /*T=typename:10*/ *T
- }
- `
- info.Uses = make(map[*ast.Ident]Object)
- f := mustParse(mainSrc)
- makePkg("main", f)
- mainScope := imports["main"].Scope()
- rx := regexp.MustCompile(`^/\*(\w*)=([\w:]*)\*/$`)
- for _, group := range f.Comments {
- for _, comment := range group.List {
- // Parse the assertion in the comment.
- m := rx.FindStringSubmatch(comment.Text)
- if m == nil {
- t.Errorf("%s: bad comment: %s",
- fset.Position(comment.Pos()), comment.Text)
- continue
- }
- name, want := m[1], m[2]
- // Look up the name in the innermost enclosing scope.
- inner := mainScope.Innermost(comment.Pos())
- if inner == nil {
- t.Errorf("%s: at %s: can't find innermost scope",
- fset.Position(comment.Pos()), comment.Text)
- continue
- }
- got := "undef"
- if _, obj := inner.LookupParent(name, comment.Pos()); obj != nil {
- kind := strings.ToLower(strings.TrimPrefix(reflect.TypeOf(obj).String(), "*types."))
- got = fmt.Sprintf("%s:%d", kind, fset.Position(obj.Pos()).Line)
- }
- if got != want {
- t.Errorf("%s: at %s: %s resolved to %s, want %s",
- fset.Position(comment.Pos()), comment.Text, name, got, want)
- }
- }
- }
- // Check that for each referring identifier,
- // a lookup of its name on the innermost
- // enclosing scope returns the correct object.
- for id, wantObj := range info.Uses {
- inner := mainScope.Innermost(id.Pos())
- if inner == nil {
- t.Errorf("%s: can't find innermost scope enclosing %q",
- fset.Position(id.Pos()), id.Name)
- continue
- }
- // Exclude selectors and qualified identifiers---lexical
- // refs only. (Ideally, we'd see if the AST parent is a
- // SelectorExpr, but that requires PathEnclosingInterval
- // from golang.org/x/tools/go/ast/astutil.)
- if id.Name == "X" {
- continue
- }
- _, gotObj := inner.LookupParent(id.Name, id.Pos())
- if gotObj != wantObj {
- t.Errorf("%s: got %v, want %v",
- fset.Position(id.Pos()), gotObj, wantObj)
- continue
- }
- }
- }