On Fri, Jun 12, 2020 at 10:08 AM T L <tapir....@gmail.com> wrote: > > On Friday, June 12, 2020 at 1:02:30 PM UTC-4, Ian Lance Taylor wrote: >> >> On Fri, Jun 12, 2020 at 9:56 AM T L <tapi...@gmail.com> wrote: >> > >> > Is "uintptr(uintptr(ptr))" a typo? Or are there any other multiple chained >> > conversions examples? >> >> That is not a typo. That is the case that worked in 1.14 and does not >> work in 1.15. >> >> Ian >> > > So "uintptr(unsafe.Pointer(ptr))" also doesn't work now?
No, that continues to work as before. Nobody has said anything about that case. Again: the case that no longer works is uintptr(uintptr(ptr)). Ian >> > On Friday, June 12, 2020 at 12:47:03 PM UTC-4, Axel Wagner wrote: >> >> >> >> AIUI: The safety rules haven't changed. How the compiler interprets them >> >> has. Previously, it interpreted them so as to allow multiple chained >> >> conversions. Now it doesn't. >> >> >> >> On Fri, Jun 12, 2020 at 2:28 PM T L <tapi...@gmail.com> wrote: >> >>> >> >>> >> >>> Package unsafe's safety rules allow converting an unsafe.Pointer into >> >>> uintptr when calling certain functions. Previously, in some cases, the >> >>> compiler allowed multiple chained conversions (for example, >> >>> syscall.Syscall(…, uintptr(uintptr(ptr)), …)). The compiler now requires >> >>> exactly one conversion. Code that used multiple conversions should be >> >>> updated to satisfy the safety rules. >> >>> >> >>> >> >>> I didn't find the difference from Go 1.14. >> >>> >> >>> -- >> >>> You received this message because you are subscribed to the Google >> >>> Groups "golang-nuts" group. >> >>> To unsubscribe from this group and stop receiving emails from it, send >> >>> an email to golan...@googlegroups.com. >> >>> To view this discussion on the web visit >> >>> https://groups.google.com/d/msgid/golang-nuts/0f62c576-a1f9-467e-b99c-42f01edaa452o%40googlegroups.com. >> > >> > -- >> > You received this message because you are subscribed to the Google Groups >> > "golang-nuts" group. >> > To unsubscribe from this group and stop receiving emails from it, send an >> > email to golan...@googlegroups.com. >> > To view this discussion on the web visit >> > https://groups.google.com/d/msgid/golang-nuts/6139806c-8937-4f71-97a0-eae51fecdb8co%40googlegroups.com. > > -- > You received this message because you are subscribed to the Google Groups > "golang-nuts" group. > To unsubscribe from this group and stop receiving emails from it, send an > email to golang-nuts+unsubscr...@googlegroups.com. > To view this discussion on the web visit > https://groups.google.com/d/msgid/golang-nuts/12d0fa65-0364-4da1-bf9a-dd6b4cef39e3o%40googlegroups.com. -- You received this message because you are subscribed to the Google Groups "golang-nuts" group. To unsubscribe from this group and stop receiving emails from it, send an email to golang-nuts+unsubscr...@googlegroups.com. To view this discussion on the web visit https://groups.google.com/d/msgid/golang-nuts/CAOyqgcXaOnk11tbvW_EJW88BqWnQFRp2uoMh9h4GkomVPZ-jxg%40mail.gmail.com.
