mirror of
https://github.com/golang/go
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32 lines
757 B
Go
32 lines
757 B
Go
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// errorcheck -0 -m -l
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// Copyright 2017 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 foo
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// Escape analysis needs to treat the uintptr-typed reflect.*Header fields as pointers.
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import (
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"reflect"
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"unsafe"
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)
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type immutableBytes []byte
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// Bug was failure to leak param b.
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func toString(b immutableBytes) string { // ERROR "leaking param: b$"
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var s string
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if len(b) == 0 {
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return s
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}
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strHeader := (*reflect.StringHeader)(unsafe.Pointer(&s)) // ERROR "toString &s does not escape$"
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strHeader.Data = (*reflect.SliceHeader)(unsafe.Pointer(&b)).Data // ERROR "toString &b does not escape$"
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l := len(b)
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strHeader.Len = l
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return s
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}
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