mirror of
https://github.com/golang/go
synced 2024-11-27 02:31:18 -07:00
1357f548b0
The introduction of temporaries in order.c was not quite right for two corner cases: 1) The rewrite that pushed new variables on the lhs of a receive into the body of the case was dropping the declaration of the variables. If the variables escape, the declaration is what allocates them. Caught by escape analysis sanity check. In fact the declarations should move into the body always, so that we only allocate if the corresponding case is selected. Do that. (This is an optimization that was already present in Go 1.2. The new order code just made it stop working.) Fixes #7997. 2) The optimization to turn a single-recv select into an ordinary receive assumed it could take the address of the destination; not so if the destination is _. Fixes #7998. LGTM=iant R=golang-codereviews, iant CC=golang-codereviews https://golang.org/cl/100480043
54 lines
733 B
Go
54 lines
733 B
Go
// compile
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// Copyright 2014 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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// /tmp/x.go:3: internal error: f &p (type *int) recorded as live on entry
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package p
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func f(ch chan int) *int {
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select {
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case p1x := <-ch:
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return &p1x
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default:
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// ok
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}
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select {
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case p1 := <-ch:
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return &p1
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default:
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// ok
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}
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select {
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case p2 := <-ch:
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return &p2
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case p3 := <-ch:
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return &p3
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default:
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// ok
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}
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select {
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case p4, ok := <-ch:
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if ok {
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return &p4
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}
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default:
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// ok
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}
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select {
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case p5, ok := <-ch:
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if ok {
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return &p5
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}
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case p6, ok := <-ch:
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if !ok {
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return &p6
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}
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default:
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// ok
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}
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return nil
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}
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