38437ce118
Reading unnecessary fields from object file take time, even from memory mapping. In deadcode, we do this a alot, so only read necessary ones. In particular, for relocations, for non-type symbols, we only need their target symbols and reloc types to build the dependency graph, so don't read other fields. This should speed up the deadcode pass. Also cache an object's number of defined package symbols, as it is accessed a lot in resolve. This is a bit ugly from an API point of view. It would be nice if the compiler could figure out some fields are not used so don't fill them. Change-Id: I5c4e9526b8a3b0aead9fa71901a51fb214f013a7 Reviewed-on: https://go-review.googlesource.com/c/go/+/218479 Run-TryBot: Cherry Zhang <cherryyz@google.com> TryBot-Result: Gobot Gobot <gobot@golang.org> Reviewed-by: Jeremy Faller <jeremy@golang.org> Reviewed-by: Than McIntosh <thanm@google.com> |
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