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Cq-Include-Trybots: luci.golang.try:gotip-linux-386-nosizespecializedmalloc,gotip-linux-amd64-nosizespecializedmalloc,gotip-linux-arm64-nosizespecializedmalloc Change-Id: I6a6a696465004b939c989afc058c4c3e1fb7134f Reviewed-on: https://go-review.googlesource.com/c/go/+/720401 Auto-Submit: Michael Matloob <matloob@golang.org> Reviewed-by: Michael Knyszek <mknyszek@google.com> LUCI-TryBot-Result: Go LUCI <golang-scoped@luci-project-accounts.iam.gserviceaccount.com> Reviewed-by: Michael Matloob <matloob@google.com>
44 lines
1.2 KiB
Go
44 lines
1.2 KiB
Go
// errorcheck -0 -live
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//go:build !goexperiment.cgocheck2
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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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// Issue 15747: liveness analysis was marking heap-escaped params live too much,
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// and worse was using the wrong bitmap bits to do so.
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package p
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var global *[]byte
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type Q struct{}
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type T struct{ M string }
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var b bool
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func f1(q *Q, xx []byte) interface{} { // ERROR "live at call to (newobject|mallocgcSmallScanNoHeaderSC[0-9]+): xx$" "live at entry to f1: xx$"
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// xx was copied from the stack to the heap on the previous line:
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// xx was live for the first two prints but then it switched to &xx
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// being live. We should not see plain xx again.
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if b {
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global = &xx
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}
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xx, _, err := f2(xx, 5) // ERROR "live at call to f2: &xx$"
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if err != nil {
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return err
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}
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return nil
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}
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//go:noinline
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func f2(d []byte, n int) (odata, res []byte, e interface{}) { // ERROR "live at entry to f2: d$"
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if n > len(d) {
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return d, nil, &T{M: "hello"} // ERROR "live at call to (newobject|mallocgcSmallScanNoHeaderSC[0-9]+)+: d"
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}
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res = d[:n]
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odata = d[n:]
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return
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}
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