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Michael PrattandgVisor bot
375b4495de
Functions using linkname are checked via checklinkname. Noescape has no automatic check anymore, but if a future version of Go invalidates the implementation, the result will be values escaping to the heap (performance loss), rather than memory corruption, so I think having no check is OK. PiperOrigin-RevId: 505173611
35 lines
1.2 KiB
Go
35 lines
1.2 KiB
Go
// Copyright 2023 The gVisor Authors.
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//
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// Licensed under the Apache License, Version 2.0 (the "License");
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// you may not use this file except in compliance with the License.
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// You may obtain a copy of the License at
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//
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// http://www.apache.org/licenses/LICENSE-2.0
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//
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// Unless required by applicable law or agreed to in writing, software
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// distributed under the License is distributed on an "AS IS" BASIS,
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// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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// See the License for the specific language governing permissions and
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// limitations under the License.
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package gohacks
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import (
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"unsafe"
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)
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// Noescape hides a pointer from escape analysis. Noescape is the identity
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// function but escape analysis doesn't think the output depends on the input.
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// Noescape is inlined and currently compiles down to zero instructions.
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// USE CAREFULLY!
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//
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// Noescape is copy/pasted from Go's runtime/stubs.go:noescape(), and is valid
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// as of Go 1.20. It is possible that this approach stops working in future
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// versions of the toolchain, at which point `p` may still escape.
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//
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//go:nosplit
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func Noescape(p unsafe.Pointer) unsafe.Pointer {
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x := uintptr(p)
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return unsafe.Pointer(x ^ 0)
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}
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