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| author | Cherry Zhang <cherryyz@google.com> | 2020-11-08 15:18:35 -0500 |
|---|---|---|
| committer | Cherry Zhang <cherryyz@google.com> | 2021-03-24 14:38:53 +0000 |
| commit | e8700f1ce6f4103207f470cce443f04377baa600 (patch) | |
| tree | 9f9bb1d99a7209b6f1500ca2e688d4765fb248ec /src/cmd/compile/internal/objw | |
| parent | 747f426944b1c0c3a26537ef78cb6c5bd4d05cde (diff) | |
| download | go-e8700f1ce6f4103207f470cce443f04377baa600.tar.gz go-e8700f1ce6f4103207f470cce443f04377baa600.zip | |
cmd/compile, cmd/link: use weak reference in itab
When converting a type T to a non-empty interface I, we build the
itab which contains the code pointers of the methods. Currently,
this brings those methods live (if the itab is live), even if the
interface method is never used. This CL changes the itab to use
weak references, so the methods can be pruned if not otherwise
live.
Fixes #42421.
Change-Id: Iee5de2ba11d603c5a102a2ba60440d839a7f9702
Reviewed-on: https://go-review.googlesource.com/c/go/+/268479
Trust: Cherry Zhang <cherryyz@google.com>
Run-TryBot: Cherry Zhang <cherryyz@google.com>
TryBot-Result: Go Bot <gobot@golang.org>
Reviewed-by: Than McIntosh <thanm@google.com>
Diffstat (limited to 'src/cmd/compile/internal/objw')
| -rw-r--r-- | src/cmd/compile/internal/objw/objw.go | 7 |
1 files changed, 7 insertions, 0 deletions
diff --git a/src/cmd/compile/internal/objw/objw.go b/src/cmd/compile/internal/objw/objw.go index 50ce7b747d..ed5ad754d9 100644 --- a/src/cmd/compile/internal/objw/objw.go +++ b/src/cmd/compile/internal/objw/objw.go @@ -46,6 +46,13 @@ func SymPtr(s *obj.LSym, off int, x *obj.LSym, xoff int) int { return off } +func SymPtrWeak(s *obj.LSym, off int, x *obj.LSym, xoff int) int { + off = int(types.Rnd(int64(off), int64(types.PtrSize))) + s.WriteWeakAddr(base.Ctxt, int64(off), types.PtrSize, x, int64(xoff)) + off += types.PtrSize + return off +} + func SymPtrOff(s *obj.LSym, off int, x *obj.LSym) int { s.WriteOff(base.Ctxt, int64(off), x, 0) off += 4 |