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7b177b1a03
In expandmeth, we call expand1/expand0 to build a list of all candidate methods to promote, and then we use dotpath to prune down which names actually resolve to a promoted method and how. However, previously we still computed "followsptr" based on the expand1/expand0 traversal (which is depth-first), rather than dotpath (which is breadth-first). The result is that we could sometimes end up miscomputing whether a particular promoted method involves a pointer traversal, which could result in bad code generation for method trampolines. Fixes #24547. Change-Id: I57dc014466d81c165b05d78b98610dc3765b7a90 Reviewed-on: https://go-review.googlesource.com/102618 Reviewed-by: Robert Griesemer <gri@golang.org>
46 lines
757 B
Go
46 lines
757 B
Go
// run
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// Copyright 2018 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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// When computing method sets with shadowed methods, make sure we
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// compute whether a method promotion involved a pointer traversal
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// based on the promoted method, not the shadowed method.
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package main
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import (
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"bytes"
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"fmt"
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)
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type mystruct struct {
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f int
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}
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func (t mystruct) String() string {
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return "FAIL"
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}
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func main() {
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type deep struct {
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mystruct
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}
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s := struct {
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deep
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*bytes.Buffer
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}{
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deep{},
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bytes.NewBufferString("ok"),
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}
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if got := s.String(); got != "ok" {
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panic(got)
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}
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var i fmt.Stringer = s
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if got := i.String(); got != "ok" {
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panic(got)
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}
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}
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