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ca4089ad62
We're dropping this behavior in favor of runtime.KeepAlive. Implement runtime.KeepAlive as an intrinsic. Update #15843 Change-Id: Ib60225bd30d6770ece1c3c7d1339a06aa25b1cbc Reviewed-on: https://go-review.googlesource.com/28310 Run-TryBot: Keith Randall <khr@golang.org> TryBot-Result: Gobot Gobot <gobot@golang.org> Reviewed-by: David Chase <drchase@google.com>
42 lines
1.2 KiB
Go
42 lines
1.2 KiB
Go
// errorcheck -0 -live
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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 entry to f1: xx" "live at call to newobject: xx" "live at call to writebarrierptr: &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 // ERROR "live at call to writebarrierptr: &xx[^x]*$"
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}
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xx, _, err := f2(xx, 5) // ERROR "live at call to newobject:( d)? &xx( odata.ptr)?" "live at call to writebarrierptr: (e|err.data err.type)$"
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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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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: 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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