f1fc9da316
LLVM tools, particularly lldb and dsymutil, don't support base address selection entries in location lists. When targeting GOOS=darwin, mode, have the linker translate location lists to CU-relative form instead. Technically, this isn't necessary when linking internally, as long as nobody plans to use anything other than Delve to look at the DWARF. But someone might want to use lldb, and it's really confusing when dwarfdump shows gibberish for the location entries. The performance cost isn't noticeable, so enable it even for internal linking. Doing this in the linker is a little weird, but it was more expensive in the compiler, probably because the compiler is much more stressful to the GC. Also, if we decide to only do it for external linking, the compiler can't see the link mode. Benchmark before and after this commit on Mac with -dwarflocationlists=1: name old time/op new time/op delta StdCmd 21.3s ± 1% 21.3s ± 1% ~ (p=0.310 n=27+27) Only StdCmd is relevant, because only StdCmd runs the linker. Whatever the cost is here, it's not very large. Change-Id: Ic8ef780d0e263230ce6aa3ca3a32fc9abd750b1e Reviewed-on: https://go-review.googlesource.com/97956 Run-TryBot: Heschi Kreinick <heschi@google.com> TryBot-Result: Gobot Gobot <gobot@golang.org> Reviewed-by: David Chase <drchase@google.com> |
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