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cmd/compile: fix nongeneric closures in generic functions

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Ensure that formal parameter Names are correctly copied and marked
with the correct Curfn. We need to ensure this even when the underlying
closure has no type parameters.

(Aside: it is strange that the types of things contain formal
parameter names that need to be copied. Maybe that's an underlying
larger problem that needs to be fixed.)

Fixes #45738

Change-Id: Ia13d69eea992ff7080bd44065115bc52eb624e73
Reviewed-on: https://go-review.googlesource.com/c/go/+/313652
Trust: Keith Randall <khr@golang.org>
Trust: Dan Scales <danscales@google.com>
Run-TryBot: Keith Randall <khr@golang.org>
TryBot-Result: Go Bot <gobot@golang.org>
Reviewed-by: Dan Scales <danscales@google.com>
This commit is contained in:
Keith Randall 2021-04-26 14:13:19 -07:00
parent 8ab7064e33
commit f432d3fc41
3 changed files with 26 additions and 2 deletions
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5
src/cmd/compile/internal/escape/escape.go
View File

@ -1295,7 +1295,7 @@ func (e *escape) newLoc(n ir.Node, transient bool) *location {
if n.Op() == ir.ONAME {
n := n.(*ir.Name)
if n.Curfn != e.curfn {
base.Fatalf("curfn mismatch: %v != %v", n.Curfn, e.curfn)
base.Fatalf("curfn mismatch: %v != %v for %v", n.Curfn, e.curfn, n)
}
if n.Opt != nil {
@ -1308,6 +1308,9 @@ func (e *escape) newLoc(n ir.Node, transient bool) *location {
}
func (b *batch) oldLoc(n *ir.Name) *location {
if n.Canonical().Opt == nil {
base.Fatalf("%v has no location", n)
}
return n.Canonical().Opt.(*location)
}

5
src/cmd/compile/internal/noder/stencil.go
View File

@ -667,7 +667,10 @@ func instTypeName(name string, targs []*types.Type) string {
// result is t; otherwise the result is a new type. It deals with recursive types
// by using TFORW types and finding partially or fully created types via sym.Def.
func (subst *subster) typ(t *types.Type) *types.Type {
if !t.HasTParam() {
if !t.HasTParam() && t.Kind() != types.TFUNC {
// Note: function types need to be copied regardless, as the
// types of closures may contain declarations that need
// to be copied. See #45738.
return t
}

18
test/typeparam/issue45738.go Normal file
View File

@ -0,0 +1,18 @@
// 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 main
//go:noinline
func f[T any]() {
x := 5
g := func() int { return x }
g()
}
func main() {
f[int]()
}