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cmd/compile: properly handle map assignments for OAS2DOTTYPE
The boolean destination in an OAS2DOTTYPE expression craps out during compilation when trying to assign to a map entry because, unlike slice entries, map entries are not directly addressable in memory. The solution is to properly order the boolean destination node so that map entries are set via autotmp variables. Fixes #14678 Change-Id: If344e8f232b5bdac1b53c0f0d21eeb43ab17d3de Reviewed-on: https://go-review.googlesource.com/22833 Reviewed-by: Matthew Dempsky <mdempsky@google.com> Run-TryBot: Matthew Dempsky <mdempsky@google.com> TryBot-Result: Gobot Gobot <gobot@golang.org>
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@ -569,18 +569,24 @@ func orderstmt(n *Node, order *Order) {
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orderexprlist(n.List, order)
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n.Rlist.First().Left = orderexpr(n.Rlist.First().Left, order, nil) // i in i.(T)
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if isblank(n.List.First()) {
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order.out = append(order.out, n)
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} else {
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typ := n.Rlist.First().Type
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tmp1 := ordertemp(typ, order, haspointers(typ))
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order.out = append(order.out, n)
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r := Nod(OAS, n.List.First(), tmp1)
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r = typecheck(r, Etop)
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ordermapassign(r, order)
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n.List.Set([]*Node{tmp1, n.List.Second()})
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}
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results := n.List.Slice()
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var assigns [2]*Node
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for r, res := range results {
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if !isblank(res) {
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results[r] = ordertemp(res.Type, order, haspointers(res.Type))
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assigns[r] = Nod(OAS, res, results[r])
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}
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}
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order.out = append(order.out, n)
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for _, assign := range assigns {
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if assign != nil {
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assign = typecheck(assign, Etop)
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ordermapassign(assign, order)
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}
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}
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cleantemp(t, order)
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// Special: use temporary variables to hold result,
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27
test/fixedbugs/issue14678.go
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27
test/fixedbugs/issue14678.go
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@ -0,0 +1,27 @@
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// run
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// Copyright 2016 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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m := make(map[int]bool)
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i := interface{}(1)
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var v int
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// Ensure map is updated properly
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_, m[1] = i.(int)
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v, m[2] = i.(int)
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if v != 1 {
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panic("fail: v should be 1")
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}
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if m[1] == false {
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panic("fail: m[1] should be true")
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}
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if m[2] == false {
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panic("fail: m[2] should be true")
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}
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}
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