| commit | d162a297ed216fb02ebe409ace2387c3a656de66 | [log] [tgz] |
|---|---|---|
| author | Keith Randall <khr@golang.org> | Fri Jan 12 10:08:38 2018 -0800 |
| committer | Keith Randall <khr@golang.org> | Wed Jan 17 06:38:57 2018 +0000 |
| tree | 22ebd7ad45ee9eb149fcc36c6a686f5cc05ab40f | |
| parent | 165e7523fb627cc7f6be56b7318fea34d73d7167 [diff] |
cmd/cgo: rewrite CFTypeRef and subytes on Darwin to uintptr Cgo currently maps CFTypeRef and its subtypes to unsafe.Pointer or a pointer to a named empty struct. However, Darwin sometimes encodes some of CFTypeRef's subtypes as a few int fields packed in a pointer wrapper. This hackery confuses the Go runtime as the pointers can look like they point to things that shouldn't be pointed at. Switch CFTypeRef and its subtypes to map to uintptr. Detecting the affected set of types is tricky, there are over 200 of them, and the set isn't static across Darwin versions. Fortunately, downcasting from CFTypeRef to a subtype requires calling CFGetTypeID, getting a CFTypeID token, and comparing that with a known id from a *GetTypeID() call. So we can find all the type names by detecting all the *GetTypeID() prototypes and rewriting the corresponding *Ref types to uintptr. This strategy covers all the cases I've checked and is unlikely to have a false positive. Update #23091. Change-Id: I487eb4105c9b4785ba564de9c38d472c8c9a76ac Reviewed-on: https://go-review.googlesource.com/87615 Run-TryBot: Keith Randall <khr@golang.org> TryBot-Result: Gobot Gobot <gobot@golang.org> Reviewed-by: Ian Lance Taylor <iant@golang.org>
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