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This CL exports the existing ir.UintptrKeepAlive via the new directive //go:uintptrkeepalive. This makes the compiler insert KeepAlives for pointers converted to uintptr in calls, keeping them alive for the duration of the call. //go:uintptrkeepalive requires //go:nosplit, as stack growth can't handle these arguments (it cannot know which are pointers). We currently check this on the immediate function, but the actual restriction applies to all transitive calls. The existing //go:uintptrescapes is an extension of //go:uintptrkeepalive which forces pointers to escape to the heap, thus eliminating the stack growth issue. This pragma is limited to the standard library. For #51087 Change-Id: If9a19d484d3561b4219e5539b70c11a3cc09391e Reviewed-on: https://go-review.googlesource.com/c/go/+/388095 Run-TryBot: Michael Pratt <mpratt@google.com> Reviewed-by: Matthew Dempsky <mdempsky@google.com> TryBot-Result: Gopher Robot <gobot@golang.org>
12 lines
297 B
Go
12 lines
297 B
Go
// errorcheck -std
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// Copyright 2022 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 p
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//go:uintptrkeepalive
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func missingNosplit(uintptr) { // ERROR "go:uintptrkeepalive requires go:nosplit"
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}
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