qbit/go
1
0
Fork 0
mirror of https://github.com/golang/go synced 2024-11-26 05:07:59 -07:00
Code Releases Activity

cmd/compile: make sure that the names created for instantiated type are the same

Browse Source 
Now we have two functions that create names for instantiated types.
They are inconsistent when dealing with byte/rune type.

This CL makes instTypeName2 reuse the code of typecheck.InstTypeName

Fixes #48198

Change-Id: I4c216b532cba6618ef9b63fd0b76e8f1c0ed7a75
Reviewed-on: https://go-review.googlesource.com/c/go/+/347491
Reviewed-by: Dan Scales <danscales@google.com>
Trust: Dan Scales <danscales@google.com>
Trust: Keith Randall <khr@golang.org>
Run-TryBot: Dan Scales <danscales@google.com>
TryBot-Result: Go Bot <gobot@golang.org>
This commit is contained in:
korzhao 2021-09-06 21:08:05 +08:00 committed by Dan Scales
parent a1938435d6
commit 6226020c2f
2 changed files with 29 additions and 25 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

32
src/cmd/compile/internal/noder/types.go
View File

@ -5,7 +5,6 @@
package noder
import (
"bytes"
"cmd/compile/internal/base"
"cmd/compile/internal/ir"
"cmd/compile/internal/typecheck"
@ -72,29 +71,12 @@ func (g *irgen) typ1(typ types2.Type) *types.Type {
// instTypeName2 creates a name for an instantiated type, base on the type args
// (given as types2 types).
func instTypeName2(name string, targs *types2.TypeList) string {
b := bytes.NewBufferString(name)
b.WriteByte('[')
n := targs.Len()
for i := 0; i < n; i++ {
targ := targs.At(i)
if i > 0 {
b.WriteByte(',')
}
// Include package names for all types, including typeparams, to
// make sure type arguments are uniquely specified.
tname := types2.TypeString(targ,
func(pkg *types2.Package) string { return pkg.Name() })
if strings.Index(tname, ", ") >= 0 {
// types2.TypeString puts spaces after a comma in a type
// list, but we don't want spaces in our actual type names
// and method/function names derived from them.
tname = strings.Replace(tname, ", ", ",", -1)
}
b.WriteString(tname)
func (g *irgen) instTypeName2(name string, targs *types2.TypeList) string {
rparams := make([]*types.Type, targs.Len())
for i := range rparams {
rparams[i] = g.typ(targs.At(i))
}
b.WriteByte(']')
return b.String()
return typecheck.InstTypeName(name, rparams)
}
// typ0 converts a types2.Type to a types.Type, but doesn't do the caching check
@ -119,7 +101,7 @@ func (g *irgen) typ0(typ types2.Type) *types.Type {
//
// When converted to types.Type, typ has a unique name,
// based on the names of the type arguments.
instName := instTypeName2(typ.Obj().Name(), typ.TArgs())
instName := g.instTypeName2(typ.Obj().Name(), typ.TArgs())
s := g.pkg(typ.Obj().Pkg()).Lookup(instName)
if s.Def != nil {
// We have already encountered this instantiation.
@ -314,7 +296,7 @@ func (g *irgen) fillinMethods(typ *types2.Named, ntyp *types.Type) {
// generic type, so we have to do a substitution to get
// the name/type of the method of the instantiated type,
// using m.Type().RParams() and typ.TArgs()
inst2 := instTypeName2("", typ.TArgs())
inst2 := g.instTypeName2("", typ.TArgs())
name := meth.Sym().Name
i1 := strings.Index(name, "[")
i2 := strings.Index(name[i1:], "]")

22
test/typeparam/issue48198.go Normal file
View File

@ -0,0 +1,22 @@
// compile -G=3
// 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.
package p
type Foo[T any] struct {
}
func (foo Foo[T]) Get() {
}
var(
_ = Foo[byte]{}
_ = Foo[[]byte]{}
_ = Foo[map[byte]rune]{}
_ = Foo[rune]{}
_ = Foo[[]rune]{}
_ = Foo[map[rune]byte]{}
)