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[dev.link] cmd/link: free loader memory after LoadFull

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After LoadFull, we'll be using sym.Symbols mostly. We still need
the loader information for symbol index mappings and name
lookups, but not much else. Free some memory.

Linking cmd/compile,

name           old time/op    new time/op    delta
Loadlibfull_GC    44.5M ± 0%     35.8M ± 0%    -19.66%  (p=0.008 n=5+5)
Archive_GC        46.4M ± 0%     37.6M ± 0%    -18.89%  (p=0.008 n=5+5)

Linking cmd/compile with external linking,

name           old time/op    new time/op    delta
Loadlibfull_GC    82.5M ± 0%     57.4M ± 0%    -30.41%  (p=0.008 n=5+5)
Archive_GC        86.8M ± 0%     61.7M ± 0%    -28.90%  (p=0.008 n=5+5)

Change-Id: I6859d488172ef8968918b86de527fbfed6832ebf
Reviewed-on: https://go-review.googlesource.com/c/go/+/230300
Run-TryBot: Cherry Zhang <cherryyz@google.com>
TryBot-Result: Gobot Gobot <gobot@golang.org>
Reviewed-by: Jeremy Faller <jeremy@golang.org>
This commit is contained in:
Cherry Zhang 2020-04-28 18:59:57 -04:00
parent df2a46f85a
commit f886ff7b41
2 changed files with 33 additions and 1 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

2
src/cmd/link/internal/ld/pe.go
View File

@ -1130,7 +1130,7 @@ func addimports(ctxt *Link, datsect *peSection) {
for m := d.ms; m != nil; m = m.next {
m.off = uint64(pefile.nextSectOffset) + uint64(ctxt.Out.Offset()) - uint64(startoff)
ctxt.Out.Write16(0) // hint
strput(ctxt.Out, ldr.SymExtname(m.s))
strput(ctxt.Out, ldr.Syms[m.s].Extname())
}
}

32
src/cmd/link/internal/loader/loader.go
View File

@ -2124,6 +2124,38 @@ func (l *Loader) LoadFull(arch *sys.Arch, syms *sym.Symbols, needReloc bool) {
}
}
}
// Free some memory.
// At this point we still need basic index mapping, and some fields of
// external symbol payloads, but not much else.
l.values = nil
l.symSects = nil
l.outdata = nil
l.itablink = nil
l.attrOnList = nil
l.attrLocal = nil
l.attrNotInSymbolTable = nil
l.attrVisibilityHidden = nil
l.attrDuplicateOK = nil
l.attrShared = nil
l.attrExternal = nil
l.attrReadOnly = nil
l.attrTopFrame = nil
l.attrSpecial = nil
l.attrCgoExportDynamic = nil
l.attrCgoExportStatic = nil
l.outer = nil
l.align = nil
l.dynimplib = nil
l.dynimpvers = nil
l.localentry = nil
l.extname = nil
l.elfType = nil
l.plt = nil
l.got = nil
l.dynid = nil
l.relocVariant = nil
l.extRelocs = nil
}
// ResolveABIAlias given a symbol returns the ABI alias target of that