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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
52 lines
1.5 KiB
Go
52 lines
1.5 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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//go:build go1.13
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// //go:linkname directives type-checked by checklinkname. Any other
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// non-linkname assumptions outside the Go 1 compatibility guarantee should
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// have an accompanied vet check or version guard build tag.
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// Package gohacks contains utilities for subverting the Go compiler.
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package gohacks
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import (
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"unsafe"
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)
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// Note that go:linkname silently doesn't work if the local name is exported,
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// necessitating an indirection for exported functions.
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// Memmove is runtime.memmove, exported for SeqAtomicLoad/SeqAtomicTryLoad<T>.
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//
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//go:nosplit
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func Memmove(to, from unsafe.Pointer, n uintptr) {
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memmove(to, from, n)
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}
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//go:linkname memmove runtime.memmove
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//go:noescape
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func memmove(to, from unsafe.Pointer, n uintptr)
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// Nanotime is runtime.nanotime.
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//
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//go:nosplit
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func Nanotime() int64 {
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return nanotime()
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}
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//go:linkname nanotime runtime.nanotime
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//go:noescape
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func nanotime() int64
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