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cmd/compile: fix escape analysis of string min/max
When I was plumbing min/max support through the compiler, I was thinking mostly about numeric argument types. As a result, I forgot that escape analysis would need to be aware that min/max can operate on string values, which contain pointers. Fixes #64565. Change-Id: I36127ce5a2da942401910fa0f9de922726c9f94d Reviewed-on: https://go-review.googlesource.com/c/go/+/547715 Reviewed-by: Keith Randall <khr@google.com> Reviewed-by: Mauri de Souza Meneguzzo <mauri870@gmail.com> Auto-Submit: Matthew Dempsky <mdempsky@google.com> LUCI-TryBot-Result: Go LUCI <golang-scoped@luci-project-accounts.iam.gserviceaccount.com>
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@ -155,10 +155,17 @@ func (e *escape) call(ks []hole, call ir.Node) {
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e.discard(call.X)
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e.discard(call.Y)
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case ir.ODELETE, ir.OMAX, ir.OMIN, ir.OPRINT, ir.OPRINTLN, ir.ORECOVERFP:
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case ir.ODELETE, ir.OPRINT, ir.OPRINTLN, ir.ORECOVERFP:
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call := call.(*ir.CallExpr)
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for i := range call.Args {
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e.discard(call.Args[i])
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for _, arg := range call.Args {
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e.discard(arg)
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}
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e.discard(call.RType)
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case ir.OMIN, ir.OMAX:
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call := call.(*ir.CallExpr)
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for _, arg := range call.Args {
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argument(ks[0], arg)
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}
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e.discard(call.RType)
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@ -52,3 +52,10 @@ func bar() {
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s := "string"
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f([]string{s}) // ERROR "\[\]string{...} escapes to heap"
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}
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func strmin(a, b, c string) string { // ERROR "leaking param: a to result ~r0 level=0" "leaking param: b to result ~r0 level=0" "leaking param: c to result ~r0 level=0"
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return min(a, b, c)
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}
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func strmax(a, b, c string) string { // ERROR "leaking param: a to result ~r0 level=0" "leaking param: b to result ~r0 level=0" "leaking param: c to result ~r0 level=0"
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return max(a, b, c)
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}
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15
test/fixedbugs/issue64565.go
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15
test/fixedbugs/issue64565.go
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@ -0,0 +1,15 @@
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// run
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// Copyright 2023 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 := "0"
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for _, c := range "321" {
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m = max(string(c), m)
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println(m)
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}
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}
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3
test/fixedbugs/issue64565.out
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3
test/fixedbugs/issue64565.out
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@ -0,0 +1,3 @@
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3
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3
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3
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