• Keith Randall's avatar
    cmd/compile: set itab function pointers at compile time · 89d74f54
    Keith Randall authored
    I noticed that we don't set an itab's function pointers at compile
    time. Instead, we currently do it at executable startup.
    
    Set the function pointers at compile time instead. This shortens
    startup time. It has no effect on normal binary size. Object files
    will have more relocations, but that isn't a big deal.
    
    For PIE there are additional pointers that will need to be adjusted at
    load time. There are already other pointers in an itab that need to be
    adjusted, so the cache line will already be paged in. There might be
    some binary size overhead to mark these pointers. The "go test -c
    -buildmode=pie net/http" binary is 0.18% bigger.
    
    Update #20505
    
    Change-Id: I267c82489915b509ff66e512fc7319b2dd79b8f7
    Reviewed-on: https://go-review.googlesource.com/44341
    Run-TryBot: Keith Randall <khr@golang.org>
    TryBot-Result: Gobot Gobot <gobot@golang.org>
    Reviewed-by: 's avatarMartin Möhrmann <moehrmann@google.com>
    89d74f54
reflect.go 46.9 KB