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cmd/compile: add CONVIFACE nodes needed in generic code due to assignments
Added new function earlyTransformAssign() to add needed CONVIFACE nodes due to assignments in generic functions. Fixes #48049 Change-Id: I7cd9cee6ecf34ed2ef0743d1b17645b9f520fa00 Reviewed-on: https://go-review.googlesource.com/c/go/+/347914 Trust: Dan Scales <danscales@google.com> Run-TryBot: Dan Scales <danscales@google.com> TryBot-Result: Go Bot <gobot@golang.org> Reviewed-by: Keith Randall <khr@golang.org>
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@ -101,6 +101,8 @@ func (g *irgen) stmt(stmt syntax.Stmt) ir.Node {
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n.Def = initDefn(n, names)
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if delay {
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earlyTransformAssign(n, lhs, rhs)
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n.X, n.Y = lhs[0], rhs[0]
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n.SetTypecheck(3)
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return n
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}
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@ -115,6 +117,7 @@ func (g *irgen) stmt(stmt syntax.Stmt) ir.Node {
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n := ir.NewAssignListStmt(g.pos(stmt), ir.OAS2, lhs, rhs)
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n.Def = initDefn(n, names)
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if delay {
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earlyTransformAssign(n, lhs, rhs)
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n.SetTypecheck(3)
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return n
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}
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@ -365,6 +365,59 @@ assignOK:
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}
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}
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// Version of transformAssign that can run on generic code that adds CONVIFACE calls
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// as needed (and rewrites multi-value calls).
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func earlyTransformAssign(stmt ir.Node, lhs, rhs []ir.Node) {
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cr := len(rhs)
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if len(rhs) == 1 {
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if rtyp := rhs[0].Type(); rtyp != nil && rtyp.IsFuncArgStruct() {
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cr = rtyp.NumFields()
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}
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}
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// x,y,z = f()
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_, isCallExpr := rhs[0].(*ir.CallExpr)
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if isCallExpr && cr > len(rhs) {
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stmt := stmt.(*ir.AssignListStmt)
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stmt.SetOp(ir.OAS2FUNC)
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r := rhs[0].(*ir.CallExpr)
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rtyp := r.Type()
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mismatched := false
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failed := false
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for i := range lhs {
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result := rtyp.Field(i).Type
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if lhs[i].Type() == nil || result == nil {
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failed = true
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} else if lhs[i] != ir.BlankNode && !types.Identical(lhs[i].Type(), result) {
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mismatched = true
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}
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}
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if mismatched && !failed {
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typecheck.RewriteMultiValueCall(stmt, r)
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}
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return
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}
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// x, ok = y
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if len(lhs) != len(rhs) {
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assert(len(lhs) == 2 && len(rhs) == 1)
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// TODO(danscales): deal with case where x or ok is an interface
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// type. We want to add CONVIFACE now, but that is tricky, because
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// the rhs may be AS2MAPR, AS2RECV, etc. which has two result values,
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// and that is not rewritten until the order phase (o.stmt, as2ok).
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return
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}
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// Check for interface conversion on each assignment
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for i, r := range rhs {
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if lhs[i].Type() != nil && lhs[i].Type().IsInterface() {
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rhs[i] = assignconvfn(r, lhs[i].Type())
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}
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}
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}
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// Corresponds to typecheck.typecheckargs. Really just deals with multi-value calls.
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func transformArgs(n ir.InitNode) {
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var list []ir.Node
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33
test/typeparam/issue48049.go
Normal file
33
test/typeparam/issue48049.go
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@ -0,0 +1,33 @@
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// run -gcflags=-G=3
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// Copyright 2021 The Go Authors. All rights reserved.
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// Use of this source code is governed by a BSD-style
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// license that can be found in the LICENSE file.
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package main
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func main() {
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Gooer2[byte]()
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}
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type Fooer[T any] interface {
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Foo(p T)
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}
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type fooer1[T any] struct{}
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func (fooer1[T]) Foo(T) {}
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type fooer2[T any] struct {
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r []Fooer[T]
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}
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//go:noinline
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func (mr fooer2[T]) Foo(p T) {
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mr.r[0] = fooer1[T]{}
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return
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}
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func Gooer2[T any]() Fooer[T] {
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return fooer2[T]{}
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}
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