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| author | Cherry Zhang <cherryyz@google.com> | 2020-09-20 23:29:20 -0400 |
|---|---|---|
| committer | Cherry Zhang <cherryyz@google.com> | 2020-09-28 21:30:01 +0000 |
| commit | af18bce87cc7ee1ffc68f91abefa241ab209539e (patch) | |
| tree | 61998d0ad04ff13fd25f4466a5bcfa627b9d7569 /src/cmd/link/internal/loader | |
| parent | ad0ab812f8b80416c92ed227974e3194e98f4cdc (diff) | |
| download | go-af18bce87cc7ee1ffc68f91abefa241ab209539e.tar.xz | |
cmd/link: consider interface conversions only in reachable code
The linker prunes methods that are not directly reachable if the
receiver type is never converted to interface. Currently, this
"never" is too strong: it is invalidated even if the interface
conversion is in an unreachable function. This CL improves it by
only considering interface conversions in reachable code. To do
that, we introduce a marker relocation R_USEIFACE, which marks
the target symbol as UsedInIface if the source symbol is reached.
binary size before after
cmd/compile 18897528 18887400
cmd/go 13607372 13470652
Change-Id: I66c6b69eeff9ae02d84d2e6f2bc7f1b29dd53910
Reviewed-on: https://go-review.googlesource.com/c/go/+/256797
Trust: Cherry Zhang <cherryyz@google.com>
Reviewed-by: Jeremy Faller <jeremy@golang.org>
Reviewed-by: Than McIntosh <thanm@google.com>
Diffstat (limited to 'src/cmd/link/internal/loader')
| -rw-r--r-- | src/cmd/link/internal/loader/loader.go | 1 |
1 files changed, 1 insertions, 0 deletions
diff --git a/src/cmd/link/internal/loader/loader.go b/src/cmd/link/internal/loader/loader.go index 43a0352e0b..ea99233f67 100644 --- a/src/cmd/link/internal/loader/loader.go +++ b/src/cmd/link/internal/loader/loader.go @@ -63,6 +63,7 @@ type Reloc struct { func (rel Reloc) Type() objabi.RelocType { return objabi.RelocType(rel.Reloc.Type()) + rel.typ } func (rel Reloc) Sym() Sym { return rel.l.resolve(rel.r, rel.Reloc.Sym()) } func (rel Reloc) SetSym(s Sym) { rel.Reloc.SetSym(goobj.SymRef{PkgIdx: 0, SymIdx: uint32(s)}) } +func (rel Reloc) IsMarker() bool { return rel.Siz() == 0 } func (rel Reloc) SetType(t objabi.RelocType) { if t != objabi.RelocType(uint8(t)) { |