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go/parser,go/types: hide API changes related to type parameters

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While the dev.typeparams branch was merged, the type parameter API is
slated for go1.18. Hide these changes to the go/parser and go/types API.

This was done as follows:
 + For APIs that will probably not be needed for go1.18, simply unexport
   them.
 + For APIs that we expect to export in go1.18, prefix symbols with '_',
   so that the planned (upper-cased) symbol name is apparent.
 + For APIs that must be exported for testing, move both API and tests
   to files guarded by the go1.18 build constraint.
 + parser.ParseTypeParams is unexported and copied wherever it is
   needed.
 + The -G flag is removed from gofmt, replaced by enabling type
   parameters if built with the go1.18 build constraint.

Notably, changes related to type parameters in go/ast are currently left
exported. We're looking at the AST API separately.

The new API diff from 1.16 is:
+pkg go/ast, method (*FuncDecl) IsMethod() bool
+pkg go/ast, method (*ListExpr) End() token.Pos
+pkg go/ast, method (*ListExpr) Pos() token.Pos
+pkg go/ast, type FuncType struct, TParams *FieldList
+pkg go/ast, type ListExpr struct
+pkg go/ast, type ListExpr struct, ElemList []Expr
+pkg go/ast, type TypeSpec struct, TParams *FieldList
+pkg go/types, type Config struct, GoVersion string

Change-Id: I1baf67e26279b49092e774309a836c460979774a
Reviewed-on: https://go-review.googlesource.com/c/go/+/295929
Trust: Robert Findley <rfindley@google.com>
Trust: Robert Griesemer <gri@golang.org>
Run-TryBot: Robert Findley <rfindley@google.com>
TryBot-Result: Go Bot <gobot@golang.org>
Reviewed-by: Robert Griesemer <gri@golang.org>
This commit is contained in:
Rob Findley 2021-02-24 10:31:11 -05:00 committed by Robert Findley
parent ff5cf4ced3
commit a6eeb4add4
31 changed files with 370 additions and 304 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

25
src/cmd/gofmt/gofmt.go
View File

@ -26,13 +26,16 @@ import (
var (
// main operation modes
list = flag.Bool("l", false, "list files whose formatting differs from gofmt's")
write = flag.Bool("w", false, "write result to (source) file instead of stdout")
rewriteRule = flag.String("r", "", "rewrite rule (e.g., 'a[b:len(a)] -> a[b:]')")
simplifyAST = flag.Bool("s", false, "simplify code")
doDiff = flag.Bool("d", false, "display diffs instead of rewriting files")
allErrors = flag.Bool("e", false, "report all errors (not just the first 10 on different lines)")
allowTypeParams = flag.Bool("G", false, "allow generic code")
list = flag.Bool("l", false, "list files whose formatting differs from gofmt's")
write = flag.Bool("w", false, "write result to (source) file instead of stdout")
rewriteRule = flag.String("r", "", "rewrite rule (e.g., 'a[b:len(a)] -> a[b:]')")
simplifyAST = flag.Bool("s", false, "simplify code")
doDiff = flag.Bool("d", false, "display diffs instead of rewriting files")
allErrors = flag.Bool("e", false, "report all errors (not just the first 10 on different lines)")
// allowTypeParams controls whether type parameters are allowed in the code
// being formatted. It is enabled for go1.18 in gofmt_go1.18.go.
allowTypeParams = false
// debugging
cpuprofile = flag.String("cpuprofile", "", "write cpu profile to this file")
@ -48,6 +51,10 @@ const (
//
// This value is defined in go/printer specifically for go/format and cmd/gofmt.
printerNormalizeNumbers = 1 << 30
// parseTypeParams tells go/parser to parse type parameters. Must be kept in
// sync with go/parser/interface.go.
parseTypeParams parser.Mode = 1 << 30
)
var (
@ -72,8 +79,8 @@ func initParserMode() {
if *allErrors {
parserMode |= parser.AllErrors
}
if *allowTypeParams {
parserMode |= parser.ParseTypeParams
if allowTypeParams {
parserMode |= parseTypeParams
}
}

12
src/cmd/gofmt/gofmt_go1.18.go Normal file
View File

@ -0,0 +1,12 @@
// Copyright 2021 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.
//go:build go1.18
// +build go1.18
package main
func init() {
allowTypeParams = true
}

3
src/cmd/gofmt/gofmt_test.go
View File

@ -78,7 +78,8 @@ func runTest(t *testing.T, in, out string) {
// fake flag - pretend input is from stdin
stdin = true
case "-G":
*allowTypeParams = true
// fake flag - allow parsing type parameters
allowTypeParams = true
default:
t.Errorf("unrecognized flag name: %s", name)
}

2
src/go/parser/error_test.go
View File

@ -188,7 +188,7 @@ func TestErrors(t *testing.T) {
if !d.IsDir() && !strings.HasPrefix(name, ".") && (strings.HasSuffix(name, ".src") || strings.HasSuffix(name, ".go2")) {
mode := DeclarationErrors | AllErrors
if strings.HasSuffix(name, ".go2") {
mode |= ParseTypeParams
mode |= parseTypeParams
}
checkErrors(t, filepath.Join(testdata, name), nil, mode, true)
}

8
src/go/parser/interface.go
View File

@ -55,8 +55,14 @@ const (
Trace // print a trace of parsed productions
DeclarationErrors // report declaration errors
SpuriousErrors // same as AllErrors, for backward-compatibility
ParseTypeParams // Placeholder. Will control the parsing of type parameters.
AllErrors = SpuriousErrors // report all errors (not just the first 10 on different lines)
// parseTypeParams controls the parsing of type parameters. Must be
// kept in sync with:
// go/printer/printer_test.go
// go/types/check_test.go
// cmd/gofmt/gofmt.go
parseTypeParams = 1 << 30
)
// ParseFile parses the source code of a single Go source file and returns

22
src/go/parser/parser.go
View File

@ -651,7 +651,7 @@ func (p *parser) parseQualifiedIdent(ident *ast.Ident) ast.Expr {
}
typ := p.parseTypeName(ident)
if p.tok == token.LBRACK && p.mode&ParseTypeParams != 0 {
if p.tok == token.LBRACK && p.mode&parseTypeParams != 0 {
typ = p.parseTypeInstance(typ)
}
@ -712,7 +712,7 @@ func (p *parser) parseArrayFieldOrTypeInstance(x *ast.Ident) (*ast.Ident, ast.Ex
// TODO(rfindley): consider changing parseRhsOrType so that this function variable
// is not needed.
argparser := p.parseRhsOrType
if p.mode&ParseTypeParams == 0 {
if p.mode&parseTypeParams == 0 {
argparser = p.parseRhs
}
if p.tok != token.RBRACK {
@ -742,13 +742,13 @@ func (p *parser) parseArrayFieldOrTypeInstance(x *ast.Ident) (*ast.Ident, ast.Ex
// x [P]E
return x, &ast.ArrayType{Lbrack: lbrack, Len: args[0], Elt: elt}
}
if p.mode&ParseTypeParams == 0 {
if p.mode&parseTypeParams == 0 {
p.error(rbrack, "missing element type in array type expression")
return nil, &ast.BadExpr{From: args[0].Pos(), To: args[0].End()}
}
}
if p.mode&ParseTypeParams == 0 {
if p.mode&parseTypeParams == 0 {
p.error(firstComma, "expected ']', found ','")
return x, &ast.BadExpr{From: args[0].Pos(), To: args[len(args)-1].End()}
}
@ -1045,7 +1045,7 @@ func (p *parser) parseParameters(scope *ast.Scope, acceptTParams bool) (tparams,
defer un(trace(p, "Parameters"))
}
if p.mode&ParseTypeParams != 0 && acceptTParams && p.tok == token.LBRACK {
if p.mode&parseTypeParams != 0 && acceptTParams && p.tok == token.LBRACK {
opening := p.pos
p.next()
// [T any](params) syntax
@ -1119,7 +1119,7 @@ func (p *parser) parseMethodSpec(scope *ast.Scope) *ast.Field {
x := p.parseTypeName(nil)
if ident, _ := x.(*ast.Ident); ident != nil {
switch {
case p.tok == token.LBRACK && p.mode&ParseTypeParams != 0:
case p.tok == token.LBRACK && p.mode&parseTypeParams != 0:
// generic method or embedded instantiated type
lbrack := p.pos
p.next()
@ -1171,7 +1171,7 @@ func (p *parser) parseMethodSpec(scope *ast.Scope) *ast.Field {
} else {
// embedded, possibly instantiated type
typ = x
if p.tok == token.LBRACK && p.mode&ParseTypeParams != 0 {
if p.tok == token.LBRACK && p.mode&parseTypeParams != 0 {
// embedded instantiated interface
typ = p.parseTypeInstance(typ)
}
@ -1193,7 +1193,7 @@ func (p *parser) parseInterfaceType() *ast.InterfaceType {
lbrace := p.expect(token.LBRACE)
scope := ast.NewScope(nil) // interface scope
var list []*ast.Field
for p.tok == token.IDENT || p.mode&ParseTypeParams != 0 && p.tok == token.TYPE {
for p.tok == token.IDENT || p.mode&parseTypeParams != 0 && p.tok == token.TYPE {
if p.tok == token.IDENT {
list = append(list, p.parseMethodSpec(scope))
} else {
@ -1289,7 +1289,7 @@ func (p *parser) tryIdentOrType() ast.Expr {
switch p.tok {
case token.IDENT:
typ := p.parseTypeName(nil)
if p.tok == token.LBRACK && p.mode&ParseTypeParams != 0 {
if p.tok == token.LBRACK && p.mode&parseTypeParams != 0 {
typ = p.parseTypeInstance(typ)
}
return typ
@ -1552,7 +1552,7 @@ func (p *parser) parseIndexOrSliceOrInstance(x ast.Expr) ast.Expr {
return &ast.IndexExpr{X: x, Lbrack: lbrack, Index: index[0], Rbrack: rbrack}
}
if p.mode&ParseTypeParams == 0 {
if p.mode&parseTypeParams == 0 {
p.error(firstComma, "expected ']' or ':', found ','")
return &ast.BadExpr{From: args[0].Pos(), To: args[len(args)-1].End()}
}
@ -2696,7 +2696,7 @@ func (p *parser) parseTypeSpec(doc *ast.CommentGroup, _ token.Pos, _ token.Token
p.exprLev++
x := p.parseExpr(true) // we don't know yet if we're a lhs or rhs expr
p.exprLev--
if name0, _ := x.(*ast.Ident); p.mode&ParseTypeParams != 0 && name0 != nil && p.tok != token.RBRACK {
if name0, _ := x.(*ast.Ident); p.mode&parseTypeParams != 0 && name0 != nil && p.tok != token.RBRACK {
// generic type [T any];
p.parseGenericType(spec, lbrack, name0, token.RBRACK)
} else {

14
src/go/parser/short_test.go
View File

@ -64,8 +64,8 @@ var valids = []string{
}
// validWithTParamsOnly holds source code examples that are valid if
// ParseTypeParams is set, but invalid if not. When checking with the
// ParseTypeParams set, errors are ignored.
// parseTypeParams is set, but invalid if not. When checking with the
// parseTypeParams set, errors are ignored.
var validWithTParamsOnly = []string{
`package p; type _ []T[ /* ERROR "expected ';', found '\['" */ int]`,
`package p; type T[P any /* ERROR "expected ']', found any" */ ] struct { P }`,
@ -131,10 +131,10 @@ func TestValid(t *testing.T) {
})
t.Run("tparams", func(t *testing.T) {
for _, src := range valids {
checkErrors(t, src, src, DeclarationErrors|AllErrors|ParseTypeParams, false)
checkErrors(t, src, src, DeclarationErrors|AllErrors|parseTypeParams, false)
}
for _, src := range validWithTParamsOnly {
checkErrors(t, src, src, DeclarationErrors|AllErrors|ParseTypeParams, false)
checkErrors(t, src, src, DeclarationErrors|AllErrors|parseTypeParams, false)
}
})
}
@ -142,7 +142,7 @@ func TestValid(t *testing.T) {
// TestSingle is useful to track down a problem with a single short test program.
func TestSingle(t *testing.T) {
const src = `package p; var _ = T[P]{}`
checkErrors(t, src, src, DeclarationErrors|AllErrors|ParseTypeParams, true)
checkErrors(t, src, src, DeclarationErrors|AllErrors|parseTypeParams, true)
}
var invalids = []string{
@ -261,10 +261,10 @@ func TestInvalid(t *testing.T) {
})
t.Run("tparams", func(t *testing.T) {
for _, src := range invalids {
checkErrors(t, src, src, DeclarationErrors|AllErrors|ParseTypeParams, true)
checkErrors(t, src, src, DeclarationErrors|AllErrors|parseTypeParams, true)
}
for _, src := range invalidTParamErrs {
checkErrors(t, src, src, DeclarationErrors|AllErrors|ParseTypeParams, true)
checkErrors(t, src, src, DeclarationErrors|AllErrors|parseTypeParams, true)
}
})
}

17
src/go/printer/printer_test.go
View File

@ -19,6 +19,10 @@ import (
"time"
)
// parseTypeParams tells go/parser to parse type parameters. Must be kept in
// sync with go/parser/interface.go.
const parseTypeParams parser.Mode = 1 << 30
const (
dataDir = "testdata"
tabwidth = 8
@ -35,6 +39,7 @@ const (
rawFormat
normNumber
idempotent
allowTypeParams
)
// format parses src, prints the corresponding AST, verifies the resulting
@ -42,7 +47,11 @@ const (
// if any.
func format(src []byte, mode checkMode) ([]byte, error) {
// parse src
f, err := parser.ParseFile(fset, "", src, parser.ParseComments|parser.ParseTypeParams)
parseMode := parser.ParseComments
if mode&allowTypeParams != 0 {
parseMode |= parseTypeParams
}
f, err := parser.ParseFile(fset, "", src, parseMode)
if err != nil {
return nil, fmt.Errorf("parse: %s\n%s", err, src)
}
@ -70,7 +79,7 @@ func format(src []byte, mode checkMode) ([]byte, error) {
// make sure formatted output is syntactically correct
res := buf.Bytes()
if _, err := parser.ParseFile(fset, "", res, parser.ParseTypeParams); err != nil {
if _, err := parser.ParseFile(fset, "", res, parseTypeParams); err != nil {
return nil, fmt.Errorf("re-parse: %s\n%s", err, buf.Bytes())
}
@ -201,13 +210,13 @@ var data = []entry{
{"linebreaks.input", "linebreaks.golden", idempotent},
{"expressions.input", "expressions.golden", idempotent},
{"expressions.input", "expressions.raw", rawFormat | idempotent},
{"declarations.input", "declarations.golden", 0},
{"declarations.input", "declarations.golden", allowTypeParams},
{"statements.input", "statements.golden", 0},
{"slow.input", "slow.golden", idempotent},
{"complit.input", "complit.x", export},
{"go2numbers.input", "go2numbers.golden", idempotent},
{"go2numbers.input", "go2numbers.norm", normNumber | idempotent},
{"generics.input", "generics.golden", idempotent},
{"generics.input", "generics.golden", idempotent | allowTypeParams},
{"gobuild1.input", "gobuild1.golden", idempotent},
{"gobuild2.input", "gobuild2.golden", idempotent},
{"gobuild3.input", "gobuild3.golden", idempotent},

10
src/go/types/api.go
View File

@ -184,11 +184,11 @@ type Info struct {
// qualified identifiers are collected in the Uses map.
Types map[ast.Expr]TypeAndValue
// Inferred maps calls of parameterized functions that use
// type inference to the inferred type arguments and signature
// _Inferred maps calls of parameterized functions that use
// type inference to the _Inferred type arguments and signature
// of the function called. The recorded "call" expression may be
// an *ast.CallExpr (as in f(x)), or an *ast.IndexExpr (s in f[T]).
Inferred map[ast.Expr]Inferred
_Inferred map[ast.Expr]_Inferred
// Defs maps identifiers to the objects they define (including
// package names, dots "." of dot-imports, and blank "_" identifiers).
@ -346,9 +346,9 @@ func (tv TypeAndValue) HasOk() bool {
return tv.mode == commaok || tv.mode == mapindex
}
// Inferred reports the inferred type arguments and signature
// _Inferred reports the _Inferred type arguments and signature
// for a parameterized function call that uses type inference.
type Inferred struct {
type _Inferred struct {
Targs []Type
Sig *Signature
}

22
src/go/types/api_go1.18.go Normal file
View File

@ -0,0 +1,22 @@
// Copyright 2021 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.
//go:build go1.18
// +build go1.18
package types
import (
"go/ast"
)
type Inferred = _Inferred
func GetInferred(info *Info) map[ast.Expr]Inferred {
return info._Inferred
}
func SetInferred(info *Info, inferred map[ast.Expr]Inferred) {
info._Inferred = inferred
}

138
src/go/types/api_go1.18_test.go Normal file
View File

@ -0,0 +1,138 @@
// Copyright 2021 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.
//go:build go1.18
package types_test
import (
"fmt"
"go/ast"
"testing"
. "go/types"
)
func TestInferredInfo(t *testing.T) {
var tests = []struct {
src string
fun string
targs []string
sig string
}{
{genericPkg + `p0; func f[T any](T); func _() { f(42) }`,
`f`,
[]string{`int`},
`func(int)`,
},
{genericPkg + `p1; func f[T any](T) T; func _() { f('@') }`,
`f`,
[]string{`rune`},
`func(rune) rune`,
},
{genericPkg + `p2; func f[T any](...T) T; func _() { f(0i) }`,
`f`,
[]string{`complex128`},
`func(...complex128) complex128`,
},
{genericPkg + `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)`,
},
{genericPkg + `p4; func f[A, B any](A, *B, ...[]B); func _() { f(1.2, new(byte)) }`,
`f`,
[]string{`float64`, `byte`},
`func(float64, *byte, ...[]byte)`,
},
{genericPkg + `s1; func f[T any, P interface{type *T}](x T); func _(x string) { f(x) }`,
`f`,
[]string{`string`, `*string`},
`func(x string)`,
},
{genericPkg + `s2; func f[T any, P interface{type *T}](x []T); func _(x []int) { f(x) }`,
`f`,
[]string{`int`, `*int`},
`func(x []int)`,
},
{genericPkg + `s3; type C[T any] interface{type chan<- T}; func f[T any, P C[T]](x []T); func _(x []int) { f(x) }`,
`f`,
[]string{`int`, `chan<- int`},
`func(x []int)`,
},
{genericPkg + `s4; type C[T any] interface{type 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)`,
},
{genericPkg + `t1; func f[T any, P interface{type *T}]() T; func _() { _ = f[string] }`,
`f`,
[]string{`string`, `*string`},
`func() string`,
},
{genericPkg + `t2; type C[T any] interface{type chan<- T}; func f[T any, P C[T]]() []T; func _() { _ = f[int] }`,
`f`,
[]string{`int`, `chan<- int`},
`func() []int`,
},
{genericPkg + `t3; type C[T any] interface{type chan<- T}; func f[T any, P C[T], Q C[[]*P]]() []T; func _() { _ = f[int] }`,
`f`,
[]string{`int`, `chan<- int`, `chan<- []*chan<- int`},
`func() []int`,
},
}
for _, test := range tests {
info := Info{}
SetInferred(&info, make(map[ast.Expr]Inferred))
name, err := mayTypecheck(t, "InferredInfo", test.src, &info)
if err != nil {
t.Errorf("package %s: %v", name, err)
continue
}
// look for inferred type arguments and signature
var targs []Type
var sig *Signature
for call, inf := range GetInferred(&info) {
var fun ast.Expr
switch x := call.(type) {
case *ast.CallExpr:
fun = x.Fun
case *ast.IndexExpr:
fun = x.X
default:
panic(fmt.Sprintf("unexpected call expression type %T", call))
}
if ExprString(fun) == test.fun {
targs = inf.Targs
sig = inf.Sig
break
}
}
if targs == nil {
t.Errorf("package %s: no inferred information found for %s", name, test.fun)
continue
}
// check that type arguments are correct
if len(targs) != len(test.targs) {
t.Errorf("package %s: got %d type arguments; want %d", 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", name, i, got, test.targs[i])
continue
}
}
// check that signature is correct
if got := sig.String(); got != test.sig {
t.Errorf("package %s: got %s; want %s", name, got, test.sig)
}
}
}

124
src/go/types/api_test.go
View File

@ -49,7 +49,7 @@ const genericPkg = "package generic_"
func modeForSource(src string) parser.Mode {
if strings.HasPrefix(src, genericPkg) {
return parser.ParseTypeParams
return parseTypeParams
}
return 0
}
@ -377,128 +377,6 @@ func TestTypesInfo(t *testing.T) {
}
}
func TestInferredInfo(t *testing.T) {
var tests = []struct {
src string
fun string
targs []string
sig string
}{
{genericPkg + `p0; func f[T any](T); func _() { f(42) }`,
`f`,
[]string{`int`},
`func(int)`,
},
{genericPkg + `p1; func f[T any](T) T; func _() { f('@') }`,
`f`,
[]string{`rune`},
`func(rune) rune`,
},
{genericPkg + `p2; func f[T any](...T) T; func _() { f(0i) }`,
`f`,
[]string{`complex128`},
`func(...complex128) complex128`,
},
{genericPkg + `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)`,
},
{genericPkg + `p4; func f[A, B any](A, *B, ...[]B); func _() { f(1.2, new(byte)) }`,
`f`,
[]string{`float64`, `byte`},
`func(float64, *byte, ...[]byte)`,
},
{genericPkg + `s1; func f[T any, P interface{type *T}](x T); func _(x string) { f(x) }`,
`f`,
[]string{`string`, `*string`},
`func(x string)`,
},
{genericPkg + `s2; func f[T any, P interface{type *T}](x []T); func _(x []int) { f(x) }`,
`f`,
[]string{`int`, `*int`},
`func(x []int)`,
},
{genericPkg + `s3; type C[T any] interface{type chan<- T}; func f[T any, P C[T]](x []T); func _(x []int) { f(x) }`,
`f`,
[]string{`int`, `chan<- int`},
`func(x []int)`,
},
{genericPkg + `s4; type C[T any] interface{type 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)`,
},
{genericPkg + `t1; func f[T any, P interface{type *T}]() T; func _() { _ = f[string] }`,
`f`,
[]string{`string`, `*string`},
`func() string`,
},
{genericPkg + `t2; type C[T any] interface{type chan<- T}; func f[T any, P C[T]]() []T; func _() { _ = f[int] }`,
`f`,
[]string{`int`, `chan<- int`},
`func() []int`,
},
{genericPkg + `t3; type C[T any] interface{type chan<- T}; func f[T any, P C[T], Q C[[]*P]]() []T; func _() { _ = f[int] }`,
`f`,
[]string{`int`, `chan<- int`, `chan<- []*chan<- int`},
`func() []int`,
},
}
for _, test := range tests {
info := Info{Inferred: make(map[ast.Expr]Inferred)}
name, err := mayTypecheck(t, "InferredInfo", test.src, &info)
if err != nil {
t.Errorf("package %s: %v", name, err)
continue
}
// look for inferred type arguments and signature
var targs []Type
var sig *Signature
for call, inf := range info.Inferred {
var fun ast.Expr
switch x := call.(type) {
case *ast.CallExpr:
fun = x.Fun
case *ast.IndexExpr:
fun = x.X
default:
panic(fmt.Sprintf("unexpected call expression type %T", call))
}
if ExprString(fun) == test.fun {
targs = inf.Targs
sig = inf.Sig
break
}
}
if targs == nil {
t.Errorf("package %s: no inferred information found for %s", name, test.fun)
continue
}
// check that type arguments are correct
if len(targs) != len(test.targs) {
t.Errorf("package %s: got %d type arguments; want %d", 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", name, i, got, test.targs[i])
continue
}
}
// check that signature is correct
if got := sig.String(); got != test.sig {
t.Errorf("package %s: got %s; want %s", name, got, test.sig)
}
}
}
func TestDefsInfo(t *testing.T) {
var tests = []struct {
src string

8
src/go/types/builtins.go
View File

@ -179,7 +179,7 @@ func (check *Checker) builtin(x *operand, call *ast.CallExpr, id builtinId) (_ b
mode = value
}
case *Sum:
case *_Sum:
if t.is(func(t Type) bool {
switch t := under(t).(type) {
case *Basic:
@ -469,7 +469,7 @@ func (check *Checker) builtin(x *operand, call *ast.CallExpr, id builtinId) (_ b
m = 2
case *Map, *Chan:
m = 1
case *Sum:
case *_Sum:
return t.is(valid)
default:
return false
@ -732,8 +732,8 @@ func (check *Checker) applyTypeFunc(f func(Type) Type, x Type) Type {
// construct a suitable new type parameter
tpar := NewTypeName(token.NoPos, nil /* = Universe pkg */, "<type parameter>", nil)
ptyp := check.NewTypeParam(tpar, 0, &emptyInterface) // assigns type to tpar as a side-effect
tsum := NewSum(rtypes)
ptyp := check.newTypeParam(tpar, 0, &emptyInterface) // assigns type to tpar as a side-effect
tsum := _NewSum(rtypes)
ptyp.bound = &Interface{types: tsum, allMethods: markComplete, allTypes: tsum}
return ptyp

2
src/go/types/call.go
View File

@ -128,7 +128,7 @@ func (check *Checker) call(x *operand, call *ast.CallExpr) exprKind {
}
if t := asInterface(T); t != nil {
check.completeInterface(token.NoPos, t)
if t.IsConstraint() {
if t._IsConstraint() {
check.errorf(call, _Todo, "cannot use interface %s in conversion (contains type list or is comparable)", T)
break
}

4
src/go/types/check.go
View File

@ -396,8 +396,8 @@ func (check *Checker) recordCommaOkTypes(x ast.Expr, a [2]Type) {
func (check *Checker) recordInferred(call ast.Expr, targs []Type, sig *Signature) {
assert(call != nil)
assert(sig != nil)
if m := check.Inferred; m != nil {
m[call] = Inferred{targs, sig}
if m := check._Inferred; m != nil {
m[call] = _Inferred{targs, sig}
}
}

6
src/go/types/check_test.go
View File

@ -44,6 +44,10 @@ import (
. "go/types"
)
// parseTypeParams tells go/parser to parse type parameters. Must be kept in
// sync with go/parser/interface.go.
const parseTypeParams parser.Mode = 1 << 30
var (
haltOnError = flag.Bool("halt", false, "halt on error")
listErrors = flag.Bool("errlist", false, "list errors")
@ -210,7 +214,7 @@ func checkFiles(t *testing.T, goVersion string, filenames []string, srcs [][]byt
mode := parser.AllErrors
if strings.HasSuffix(filenames[0], ".go2") {
mode |= parser.ParseTypeParams
mode |= parseTypeParams
}
// parse files and collect parser errors

4
src/go/types/decl.go
View File

@ -713,7 +713,7 @@ func (check *Checker) collectTypeParams(list *ast.FieldList) (tparams []*TypeNam
setBoundAt := func(at int, bound Type) {
assert(IsInterface(bound))
tparams[at].typ.(*TypeParam).bound = bound
tparams[at].typ.(*_TypeParam).bound = bound
}
index := 0
@ -756,7 +756,7 @@ func (check *Checker) collectTypeParams(list *ast.FieldList) (tparams []*TypeNam
func (check *Checker) declareTypeParams(tparams []*TypeName, names []*ast.Ident) []*TypeName {
for _, name := range names {
tpar := NewTypeName(name.Pos(), check.pkg, name.Name, nil)
check.NewTypeParam(tpar, len(tparams), &emptyInterface) // assigns type to tpar as a side-effect
check.newTypeParam(tpar, len(tparams), &emptyInterface) // assigns type to tpar as a side-effect
check.declare(check.scope, name, tpar, check.scope.pos) // TODO(gri) check scope position
tparams = append(tparams, tpar)
}

8
src/go/types/expr.go
View File

@ -660,7 +660,7 @@ func (check *Checker) implicitTypeAndValue(x *operand, target Type) (Type, const
default:
return nil, nil, _InvalidUntypedConversion
}
case *Sum:
case *_Sum:
ok := t.is(func(t Type) bool {
target, _, _ := check.implicitTypeAndValue(x, t)
return target != nil
@ -1517,7 +1517,7 @@ func (check *Checker) exprInternal(x *operand, e ast.Expr, hint Type) exprKind {
x.expr = e
return expression
case *Sum:
case *_Sum:
// A sum type can be indexed if all of the sum's types
// support indexing and have the same index and element
// type. Special rules apply for maps in the sum type.
@ -1549,7 +1549,7 @@ func (check *Checker) exprInternal(x *operand, e ast.Expr, hint Type) exprKind {
tkey = t.key
e = t.elem
nmaps++
case *TypeParam:
case *_TypeParam:
check.errorf(x, 0, "type of %s contains a type parameter - cannot index (implementation restriction)", x)
case *instance:
panic("unimplemented")
@ -1661,7 +1661,7 @@ func (check *Checker) exprInternal(x *operand, e ast.Expr, hint Type) exprKind {
valid = true
// x.typ doesn't change
case *Sum, *TypeParam:
case *_Sum, *_TypeParam:
check.errorf(x, 0, "generic slice expressions not yet implemented")
goto Error
}

8
src/go/types/infer.go
View File

@ -98,7 +98,7 @@ func (check *Checker) infer(tparams []*TypeName, params *Tuple, args []*operand)
// only parameter type it can possibly match against is a *TypeParam.
// Thus, only keep the indices of generic parameters that are not of
// composite types and which don't have a type inferred yet.
if tpar, _ := par.typ.(*TypeParam); tpar != nil && u.x.at(tpar.index) == nil {
if tpar, _ := par.typ.(*_TypeParam); tpar != nil && u.x.at(tpar.index) == nil {
indices[j] = i
j++
}
@ -201,7 +201,7 @@ func (w *tpWalker) isParameterized(typ Type) (res bool) {
}
}
case *Sum:
case *_Sum:
return w.isParameterizedList(t.types)
case *Signature:
@ -243,7 +243,7 @@ func (w *tpWalker) isParameterized(typ Type) (res bool) {
case *Named:
return w.isParameterizedList(t.targs)
case *TypeParam:
case *_TypeParam:
// t must be one of w.tparams
return t.index < len(w.tparams) && w.tparams[t.index].typ == t
@ -291,7 +291,7 @@ func (check *Checker) inferB(tparams []*TypeName, targs []Type) (types []Type, i
// Unify type parameters with their structural constraints, if any.
for _, tpar := range tparams {
typ := tpar.typ.(*TypeParam)
typ := tpar.typ.(*_TypeParam)
sbound := check.structuralType(typ.bound)
if sbound != nil {
if !u.unify(typ, sbound) {

4
src/go/types/lookup.go
View File

@ -107,7 +107,7 @@ func (check *Checker) rawLookupFieldOrMethod(T Type, addressable bool, pkg *Pack
var next []embeddedType // embedded types found at current depth
// look for (pkg, name) in all types at current depth
var tpar *TypeParam // set if obj receiver is a type parameter
var tpar *_TypeParam // set if obj receiver is a type parameter
for _, e := range current {
typ := e.typ
@ -195,7 +195,7 @@ func (check *Checker) rawLookupFieldOrMethod(T Type, addressable bool, pkg *Pack
indirect = e.indirect
}
case *TypeParam:
case *_TypeParam:
// only consider explicit methods in the type parameter bound, not
// methods that may be common to all types in the type list.
if i, m := lookupMethod(t.Bound().allMethods, pkg, name); m != nil {

2
src/go/types/operand.go
View File

@ -242,7 +242,7 @@ func (x *operand) assignableTo(check *Checker, T Type, reason *string) (bool, er
// x is an untyped value representable by a value of type T.
if isUntyped(Vu) {
if t, ok := Tu.(*Sum); ok {
if t, ok := Tu.(*_Sum); ok {
return t.is(func(t Type) bool {
// TODO(gri) this could probably be more efficient
ok, _ := x.assignableTo(check, t, reason)

22
src/go/types/predicates.go
View File

@ -14,7 +14,7 @@ import (
// isNamed may be called with types that are not fully set up.
func isNamed(typ Type) bool {
switch typ.(type) {
case *Basic, *Named, *TypeParam, *instance:
case *Basic, *Named, *_TypeParam, *instance:
return true
}
return false
@ -32,7 +32,7 @@ func is(typ Type, what BasicInfo) bool {
switch t := optype(typ).(type) {
case *Basic:
return t.info&what != 0
case *Sum:
case *_Sum:
return t.is(func(typ Type) bool { return is(typ, what) })
}
return false
@ -109,7 +109,7 @@ func comparable(T Type, seen map[Type]bool) bool {
//
// is not comparable because []byte is not comparable.
if t := asTypeParam(T); t != nil && optype(t) == theTop {
return t.Bound().IsComparable()
return t.Bound()._IsComparable()
}
switch t := optype(T).(type) {
@ -128,13 +128,13 @@ func comparable(T Type, seen map[Type]bool) bool {
return true
case *Array:
return comparable(t.elem, seen)
case *Sum:
case *_Sum:
pred := func(t Type) bool {
return comparable(t, seen)
}
return t.is(pred)
case *TypeParam:
return t.Bound().IsComparable()
case *_TypeParam:
return t.Bound()._IsComparable()
}
return false
}
@ -146,7 +146,7 @@ func hasNil(typ Type) bool {
return t.kind == UnsafePointer
case *Slice, *Pointer, *Signature, *Interface, *Map, *Chan:
return true
case *Sum:
case *_Sum:
return t.is(hasNil)
}
return false
@ -265,14 +265,14 @@ func (check *Checker) identical0(x, y Type, cmpTags bool, p *ifacePair) bool {
check.identical0(x.results, y.results, cmpTags, p)
}
case *Sum:
case *_Sum:
// Two sum types are identical if they contain the same types.
// (Sum types always consist of at least two types. Also, the
// the set (list) of types in a sum type consists of unique
// types - each type appears exactly once. Thus, two sum types
// must contain the same number of types to have chance of
// being equal.
if y, ok := y.(*Sum); ok && len(x.types) == len(y.types) {
if y, ok := y.(*_Sum); ok && len(x.types) == len(y.types) {
// Every type in x.types must be in y.types.
// Quadratic algorithm, but probably good enough for now.
// TODO(gri) we need a fast quick type ID/hash for all types.
@ -370,7 +370,7 @@ func (check *Checker) identical0(x, y Type, cmpTags bool, p *ifacePair) bool {
return x.obj == y.obj
}
case *TypeParam:
case *_TypeParam:
// nothing to do (x and y being equal is caught in the very beginning of this function)
// case *instance:
@ -397,7 +397,7 @@ func (check *Checker) identicalTParams(x, y []*TypeName, cmpTags bool, p *ifaceP
}
for i, x := range x {
y := y[i]
if !check.identical0(x.typ.(*TypeParam).bound, y.typ.(*TypeParam).bound, cmpTags, p) {
if !check.identical0(x.typ.(*_TypeParam).bound, y.typ.(*_TypeParam).bound, cmpTags, p) {
return false
}
}

8
src/go/types/sanitize.go
View File

@ -24,7 +24,7 @@ func sanitizeInfo(info *Info) {
}
}
for e, inf := range info.Inferred {
for e, inf := range info._Inferred {
changed := false
for i, targ := range inf.Targs {
if typ := s.typ(targ); typ != targ {
@ -37,7 +37,7 @@ func sanitizeInfo(info *Info) {
changed = true
}
if changed {
info.Inferred[e] = inf
info._Inferred[e] = inf
}
}
@ -102,7 +102,7 @@ func (s sanitizer) typ(typ Type) Type {
s.tuple(t.params)
s.tuple(t.results)
case *Sum:
case *_Sum:
s.typeList(t.types)
case *Interface:
@ -135,7 +135,7 @@ func (s sanitizer) typ(typ Type) Type {
s.typeList(t.targs)
s.funcList(t.methods)
case *TypeParam:
case *_TypeParam:
if bound := s.typ(t.bound); bound != t.bound {
t.bound = bound
}

4
src/go/types/scope.go
View File

@ -108,13 +108,13 @@ func (s *Scope) Insert(obj Object) Object {
return nil
}
// Squash merges s with its parent scope p by adding all
// squash merges s with its parent scope p by adding all
// objects of s to p, adding all children of s to the
// children of p, and removing s from p's children.
// The function f is called for each object obj in s which
// has an object alt in p. s should be discarded after
// having been squashed.
func (s *Scope) Squash(err func(obj, alt Object)) {
func (s *Scope) squash(err func(obj, alt Object)) {
p := s.parent
assert(p != nil)
for _, obj := range s.elems {

2
src/go/types/sizes.go
View File

@ -148,7 +148,7 @@ func (s *StdSizes) Sizeof(T Type) int64 {
}
offsets := s.Offsetsof(t.fields)
return offsets[n-1] + s.Sizeof(t.fields[n-1].typ)
case *Sum:
case *_Sum:
panic("Sizeof unimplemented for type sum")
case *Interface:
return s.WordSize * 2

2
src/go/types/stmt.go
View File

@ -907,7 +907,7 @@ func rangeKeyVal(typ Type, wantKey, wantVal bool) (Type, Type, string) {
msg = "send-only channel"
}
return typ.elem, Typ[Invalid], msg
case *Sum:
case *_Sum:
first := true
var key, val Type
var msg string

20
src/go/types/subst.go
View File

@ -22,21 +22,21 @@ type substMap struct {
// TODO(gri) rewrite that code, get rid of this field, and make this
// struct just the map (proj)
targs []Type
proj map[*TypeParam]Type
proj map[*_TypeParam]Type
}
// makeSubstMap creates a new substitution map mapping tpars[i] to targs[i].
// If targs[i] is nil, tpars[i] is not substituted.
func makeSubstMap(tpars []*TypeName, targs []Type) *substMap {
assert(len(tpars) == len(targs))
proj := make(map[*TypeParam]Type, len(tpars))
proj := make(map[*_TypeParam]Type, len(tpars))
for i, tpar := range tpars {
// We must expand type arguments otherwise *instance
// types end up as components in composite types.
// TODO(gri) explain why this causes problems, if it does
targ := expand(targs[i]) // possibly nil
targs[i] = targ
proj[tpar.typ.(*TypeParam)] = targ
proj[tpar.typ.(*_TypeParam)] = targ
}
return &substMap{targs, proj}
}
@ -49,7 +49,7 @@ func (m *substMap) empty() bool {
return len(m.proj) == 0
}
func (m *substMap) lookup(tpar *TypeParam) Type {
func (m *substMap) lookup(tpar *_TypeParam) Type {
if t := m.proj[tpar]; t != nil {
return t
}
@ -121,7 +121,7 @@ func (check *Checker) instantiate(pos token.Pos, typ Type, targs []Type, poslist
// check bounds
for i, tname := range tparams {
tpar := tname.typ.(*TypeParam)
tpar := tname.typ.(*_TypeParam)
iface := tpar.Bound()
if iface.Empty() {
continue // no type bound
@ -222,7 +222,7 @@ func (check *Checker) subst(pos token.Pos, typ Type, smap *substMap) Type {
switch t := typ.(type) {
case *Basic:
return typ // nothing to do
case *TypeParam:
case *_TypeParam:
return smap.lookup(t)
}
@ -293,13 +293,13 @@ func (subst *subster) typ(typ Type) Type {
}
}
case *Sum:
case *_Sum:
types, copied := subst.typeList(t.types)
if copied {
// Don't do it manually, with a Sum literal: the new
// types list may not be unique and NewSum may remove
// duplicates.
return NewSum(types)
return _NewSum(types)
}
case *Interface:
@ -389,7 +389,7 @@ func (subst *subster) typ(typ Type) Type {
// create a new named type and populate caches to avoid endless recursion
tname := NewTypeName(subst.pos, t.obj.pkg, t.obj.name, nil)
named := subst.check.NewNamed(tname, t.underlying, t.methods) // method signatures are updated lazily
named := subst.check.newNamed(tname, t.underlying, t.methods) // method signatures are updated lazily
named.tparams = t.tparams // new type is still parameterized
named.targs = newTargs
subst.check.typMap[h] = named
@ -402,7 +402,7 @@ func (subst *subster) typ(typ Type) Type {
return named
case *TypeParam:
case *_TypeParam:
return subst.smap.lookup(t)
case *instance:

143
src/go/types/type.go
View File

@ -240,11 +240,11 @@ func NewSignature(recv *Var, params, results *Tuple, variadic bool) *Signature {
// contain methods whose receiver type is a different interface.
func (s *Signature) Recv() *Var { return s.recv }
// TParams returns the type parameters of signature s, or nil.
func (s *Signature) TParams() []*TypeName { return s.tparams }
// _TParams returns the type parameters of signature s, or nil.
func (s *Signature) _TParams() []*TypeName { return s.tparams }
// SetTParams sets the type parameters of signature s.
func (s *Signature) SetTParams(tparams []*TypeName) { s.tparams = tparams }
// _SetTParams sets the type parameters of signature s.
func (s *Signature) _SetTParams(tparams []*TypeName) { s.tparams = tparams }
// Params returns the parameters of signature s, or nil.
func (s *Signature) Params() *Tuple { return s.params }
@ -255,19 +255,19 @@ func (s *Signature) Results() *Tuple { return s.results }
// Variadic reports whether the signature s is variadic.
func (s *Signature) Variadic() bool { return s.variadic }
// A Sum represents a set of possible types.
// A _Sum represents a set of possible types.
// Sums are currently used to represent type lists of interfaces
// and thus the underlying types of type parameters; they are not
// first class types of Go.
type Sum struct {
type _Sum struct {
types []Type // types are unique
}
// NewSum returns a new Sum type consisting of the provided
// _NewSum returns a new Sum type consisting of the provided
// types if there are more than one. If there is exactly one
// type, it returns that type. If the list of types is empty
// the result is nil.
func NewSum(types []Type) Type {
func _NewSum(types []Type) Type {
if len(types) == 0 {
return nil
}
@ -278,7 +278,7 @@ func NewSum(types []Type) Type {
// current use case of type lists.
// TODO(gri) Come up with the rules for sum types.
for _, t := range types {
if _, ok := t.(*Sum); ok {
if _, ok := t.(*_Sum); ok {
panic("sum type contains sum type - unimplemented")
}
}
@ -286,11 +286,11 @@ func NewSum(types []Type) Type {
if len(types) == 1 {
return types[0]
}
return &Sum{types: types}
return &_Sum{types: types}
}
// is reports whether all types in t satisfy pred.
func (s *Sum) is(pred func(Type) bool) bool {
func (s *_Sum) is(pred func(Type) bool) bool {
if s == nil {
return false
}
@ -446,8 +446,8 @@ func (t *Interface) Empty() bool {
}, nil)
}
// HasTypeList reports whether interface t has a type list, possibly from an embedded type.
func (t *Interface) HasTypeList() bool {
// _HasTypeList reports whether interface t has a type list, possibly from an embedded type.
func (t *Interface) _HasTypeList() bool {
if t.allMethods != nil {
// interface is complete - quick test
return t.allTypes != nil
@ -458,8 +458,8 @@ func (t *Interface) HasTypeList() bool {
}, nil)
}
// IsComparable reports whether interface t is or embeds the predeclared interface "comparable".
func (t *Interface) IsComparable() bool {
// _IsComparable reports whether interface t is or embeds the predeclared interface "comparable".
func (t *Interface) _IsComparable() bool {
if t.allMethods != nil {
// interface is complete - quick test
_, m := lookupMethod(t.allMethods, nil, "==")
@ -472,8 +472,8 @@ func (t *Interface) IsComparable() bool {
}, nil)
}
// IsConstraint reports t.HasTypeList() || t.IsComparable().
func (t *Interface) IsConstraint() bool {
// _IsConstraint reports t.HasTypeList() || t.IsComparable().
func (t *Interface) _IsConstraint() bool {
if t.allMethods != nil {
// interface is complete - quick test
if t.allTypes != nil {
@ -667,7 +667,7 @@ func NewNamed(obj *TypeName, underlying Type, methods []*Func) *Named {
return typ
}
func (check *Checker) NewNamed(obj *TypeName, underlying Type, methods []*Func) *Named {
func (check *Checker) newNamed(obj *TypeName, underlying Type, methods []*Func) *Named {
typ := &Named{check: check, obj: obj, orig: underlying, underlying: underlying, methods: methods}
if obj.typ == nil {
obj.typ = typ
@ -681,15 +681,15 @@ func (t *Named) Obj() *TypeName { return t.obj }
// TODO(gri) Come up with a better representation and API to distinguish
// between parameterized instantiated and non-instantiated types.
// TParams returns the type parameters of the named type t, or nil.
// _TParams returns the type parameters of the named type t, or nil.
// The result is non-nil for an (originally) parameterized type even if it is instantiated.
func (t *Named) TParams() []*TypeName { return t.tparams }
func (t *Named) _TParams() []*TypeName { return t.tparams }
// TArgs returns the type arguments after instantiation of the named type t, or nil if not instantiated.
func (t *Named) TArgs() []Type { return t.targs }
// _TArgs returns the type arguments after instantiation of the named type t, or nil if not instantiated.
func (t *Named) _TArgs() []Type { return t.targs }
// SetTArgs sets the type arguments of Named.
func (t *Named) SetTArgs(args []Type) { t.targs = args }
// _SetTArgs sets the type arguments of Named.
func (t *Named) _SetTArgs(args []Type) { t.targs = args }
// NumMethods returns the number of explicit methods whose receiver is named type t.
func (t *Named) NumMethods() int { return len(t.methods) }
@ -715,8 +715,8 @@ func (t *Named) AddMethod(m *Func) {
}
}
// A TypeParam represents a type parameter type.
type TypeParam struct {
// A _TypeParam represents a type parameter type.
type _TypeParam struct {
check *Checker // for lazy type bound completion
id uint64 // unique id
obj *TypeName // corresponding type name
@ -724,10 +724,10 @@ type TypeParam struct {
bound Type // *Named or *Interface; underlying type is always *Interface
}
// NewTypeParam returns a new TypeParam.
func (check *Checker) NewTypeParam(obj *TypeName, index int, bound Type) *TypeParam {
// newTypeParam returns a new TypeParam.
func (check *Checker) newTypeParam(obj *TypeName, index int, bound Type) *_TypeParam {
assert(bound != nil)
typ := &TypeParam{check: check, id: check.nextId, obj: obj, index: index, bound: bound}
typ := &_TypeParam{check: check, id: check.nextId, obj: obj, index: index, bound: bound}
check.nextId++
if obj.typ == nil {
obj.typ = typ
@ -735,7 +735,7 @@ func (check *Checker) NewTypeParam(obj *TypeName, index int, bound Type) *TypePa
return typ
}
func (t *TypeParam) Bound() *Interface {
func (t *_TypeParam) Bound() *Interface {
iface := asInterface(t.bound)
// use the type bound position if we have one
pos := token.NoPos
@ -839,40 +839,40 @@ type top struct{}
var theTop = &top{}
// Type-specific implementations of Underlying.
func (t *Basic) Underlying() Type { return t }
func (t *Array) Underlying() Type { return t }
func (t *Slice) Underlying() Type { return t }
func (t *Struct) Underlying() Type { return t }
func (t *Pointer) Underlying() Type { return t }
func (t *Tuple) Underlying() Type { return t }
func (t *Signature) Underlying() Type { return t }
func (t *Sum) Underlying() Type { return t }
func (t *Interface) Underlying() Type { return t }
func (t *Map) Underlying() Type { return t }
func (t *Chan) Underlying() Type { return t }
func (t *Named) Underlying() Type { return t.underlying }
func (t *TypeParam) Underlying() Type { return t }
func (t *instance) Underlying() Type { return t }
func (t *bottom) Underlying() Type { return t }
func (t *top) Underlying() Type { return t }
func (t *Basic) Underlying() Type { return t }
func (t *Array) Underlying() Type { return t }
func (t *Slice) Underlying() Type { return t }
func (t *Struct) Underlying() Type { return t }
func (t *Pointer) Underlying() Type { return t }
func (t *Tuple) Underlying() Type { return t }
func (t *Signature) Underlying() Type { return t }
func (t *_Sum) Underlying() Type { return t }
func (t *Interface) Underlying() Type { return t }
func (t *Map) Underlying() Type { return t }
func (t *Chan) Underlying() Type { return t }
func (t *Named) Underlying() Type { return t.underlying }
func (t *_TypeParam) Underlying() Type { return t }
func (t *instance) Underlying() Type { return t }
func (t *bottom) Underlying() Type { return t }
func (t *top) Underlying() Type { return t }
// Type-specific implementations of String.
func (t *Basic) String() string { return TypeString(t, nil) }
func (t *Array) String() string { return TypeString(t, nil) }
func (t *Slice) String() string { return TypeString(t, nil) }
func (t *Struct) String() string { return TypeString(t, nil) }
func (t *Pointer) String() string { return TypeString(t, nil) }
func (t *Tuple) String() string { return TypeString(t, nil) }
func (t *Signature) String() string { return TypeString(t, nil) }
func (t *Sum) String() string { return TypeString(t, nil) }
func (t *Interface) String() string { return TypeString(t, nil) }
func (t *Map) String() string { return TypeString(t, nil) }
func (t *Chan) String() string { return TypeString(t, nil) }
func (t *Named) String() string { return TypeString(t, nil) }
func (t *TypeParam) String() string { return TypeString(t, nil) }
func (t *instance) String() string { return TypeString(t, nil) }
func (t *bottom) String() string { return TypeString(t, nil) }
func (t *top) String() string { return TypeString(t, nil) }
func (t *Basic) String() string { return TypeString(t, nil) }
func (t *Array) String() string { return TypeString(t, nil) }
func (t *Slice) String() string { return TypeString(t, nil) }
func (t *Struct) String() string { return TypeString(t, nil) }
func (t *Pointer) String() string { return TypeString(t, nil) }
func (t *Tuple) String() string { return TypeString(t, nil) }
func (t *Signature) String() string { return TypeString(t, nil) }
func (t *_Sum) String() string { return TypeString(t, nil) }
func (t *Interface) String() string { return TypeString(t, nil) }
func (t *Map) String() string { return TypeString(t, nil) }
func (t *Chan) String() string { return TypeString(t, nil) }
func (t *Named) String() string { return TypeString(t, nil) }
func (t *_TypeParam) String() string { return TypeString(t, nil) }
func (t *instance) String() string { return TypeString(t, nil) }
func (t *bottom) String() string { return TypeString(t, nil) }
func (t *top) String() string { return TypeString(t, nil) }
// under returns the true expanded underlying type.
// If it doesn't exist, the result is Typ[Invalid].
@ -909,22 +909,11 @@ func asSlice(t Type) *Slice {
return op
}
// TODO (rFindley) delete this on the dev.typeparams branch. This is only
// exported in the prototype for legacy compatibility.
func AsStruct(t Type) *Struct {
return asStruct(t)
}
func asStruct(t Type) *Struct {
op, _ := optype(t).(*Struct)
return op
}
// TODO(rFindley) delete this on the dev.typeparams branch (see ToStruct).
func AsPointer(t Type) *Pointer {
return asPointer(t)
}
func asPointer(t Type) *Pointer {
op, _ := optype(t).(*Pointer)
return op
@ -940,8 +929,8 @@ func asSignature(t Type) *Signature {
return op
}
func asSum(t Type) *Sum {
op, _ := optype(t).(*Sum)
func asSum(t Type) *_Sum {
op, _ := optype(t).(*_Sum)
return op
}
@ -969,7 +958,7 @@ func asNamed(t Type) *Named {
return e
}
func asTypeParam(t Type) *TypeParam {
u, _ := under(t).(*TypeParam)
func asTypeParam(t Type) *_TypeParam {
u, _ := under(t).(*_TypeParam)
return u
}

8
src/go/types/typestring.go
View File

@ -158,7 +158,7 @@ func writeType(buf *bytes.Buffer, typ Type, qf Qualifier, visited []Type) {
buf.WriteString("func")
writeSignature(buf, t, qf, visited)
case *Sum:
case *_Sum:
for i, t := range t.types {
if i > 0 {
buf.WriteString(", ")
@ -279,7 +279,7 @@ func writeType(buf *bytes.Buffer, typ Type, qf Qualifier, visited []Type) {
writeTParamList(buf, t.tparams, qf, visited)
}
case *TypeParam:
case *_TypeParam:
s := "?"
if t.obj != nil {
s = t.obj.name
@ -321,7 +321,7 @@ func writeTParamList(buf *bytes.Buffer, list []*TypeName, qf Qualifier, visited
for i, p := range list {
// TODO(rFindley) support 'any' sugar here.
var b Type = &emptyInterface
if t, _ := p.typ.(*TypeParam); t != nil && t.bound != nil {
if t, _ := p.typ.(*_TypeParam); t != nil && t.bound != nil {
b = t.bound
}
if i > 0 {
@ -334,7 +334,7 @@ func writeTParamList(buf *bytes.Buffer, list []*TypeName, qf Qualifier, visited
}
prev = b
if t, _ := p.typ.(*TypeParam); t != nil {
if t, _ := p.typ.(*_TypeParam); t != nil {
writeType(buf, t, qf, visited)
} else {
buf.WriteString(p.name)

14
src/go/types/typexpr.go
View File

@ -146,7 +146,7 @@ func (check *Checker) ordinaryType(pos positioner, typ Type) {
check.softErrorf(pos, _Todo, "interface contains type constraints (%s)", t.allTypes)
return
}
if t.IsComparable() {
if t._IsComparable() {
check.softErrorf(pos, _Todo, "interface is (or embeds) comparable")
}
}
@ -301,7 +301,7 @@ func (check *Checker) funcType(sig *Signature, recvPar *ast.FieldList, ftyp *ast
}
smap := makeSubstMap(recvTParams, list)
for i, tname := range sig.rparams {
bound := recvTParams[i].typ.(*TypeParam).bound
bound := recvTParams[i].typ.(*_TypeParam).bound
// bound is (possibly) parameterized in the context of the
// receiver type declaration. Substitute parameters for the
// current context.
@ -309,7 +309,7 @@ func (check *Checker) funcType(sig *Signature, recvPar *ast.FieldList, ftyp *ast
// (no bound == empty interface)
if bound != nil {
bound = check.subst(tname.pos, bound, smap)
tname.typ.(*TypeParam).bound = bound
tname.typ.(*_TypeParam).bound = bound
}
}
}
@ -333,7 +333,7 @@ func (check *Checker) funcType(sig *Signature, recvPar *ast.FieldList, ftyp *ast
recvList, _ := check.collectParams(scope, recvPar, recvTyp, false) // use rewritten receiver type, if any
params, variadic := check.collectParams(scope, ftyp.Params, nil, true)
results, _ := check.collectParams(scope, ftyp.Results, nil, false)
scope.Squash(func(obj, alt Object) {
scope.squash(func(obj, alt Object) {
check.errorf(obj, _DuplicateDecl, "%s redeclared in this block", obj.Name())
check.reportAltDecl(alt)
})
@ -823,7 +823,7 @@ func (check *Checker) interfaceType(ityp *Interface, iface *ast.InterfaceType, d
}
// type constraints
ityp.types = NewSum(check.collectTypeConstraints(iface.Pos(), types))
ityp.types = _NewSum(check.collectTypeConstraints(iface.Pos(), types))
if len(ityp.methods) == 0 && ityp.types == nil && len(ityp.embeddeds) == 0 {
// empty interface
@ -928,7 +928,7 @@ func (check *Checker) completeInterface(pos token.Pos, ityp *Interface) {
if etyp == nil {
if utyp != Typ[Invalid] {
var format string
if _, ok := utyp.(*TypeParam); ok {
if _, ok := utyp.(*_TypeParam); ok {
format = "%s is a type parameter, not an interface"
} else {
format = "%s is not an interface"
@ -987,7 +987,7 @@ func intersect(x, y Type) (r Type) {
if rtypes == nil {
return theBottom
}
return NewSum(rtypes)
return _NewSum(rtypes)
}
func sortTypes(list []Type) {

8
src/go/types/unify.go
View File

@ -83,7 +83,7 @@ func (d *tparamsList) init(tparams []*TypeName) {
}
if debug {
for i, tpar := range tparams {
assert(i == tpar.typ.(*TypeParam).index)
assert(i == tpar.typ.(*_TypeParam).index)
}
}
d.tparams = tparams
@ -131,7 +131,7 @@ func (u *unifier) join(i, j int) bool {
// If typ is a type parameter of d, index returns the type parameter index.
// Otherwise, the result is < 0.
func (d *tparamsList) index(typ Type) int {
if t, ok := typ.(*TypeParam); ok {
if t, ok := typ.(*_TypeParam); ok {
if i := t.index; i < len(d.tparams) && d.tparams[i].typ == t {
return i
}
@ -335,7 +335,7 @@ func (u *unifier) nify(x, y Type, p *ifacePair) bool {
u.nify(x.results, y.results, p)
}
case *Sum:
case *_Sum:
// This should not happen with the current internal use of sum types.
panic("type inference across sum types not implemented")
@ -431,7 +431,7 @@ func (u *unifier) nify(x, y Type, p *ifacePair) bool {
}
}
case *TypeParam:
case *_TypeParam:
// Two type parameters (which are not part of the type parameters of the
// enclosing type as those are handled in the beginning of this function)
// are identical if they originate in the same declaration.