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cmd/link: replace SHIDDEN bit in SymKind with a bit of Attribute

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Change-Id: I02dab81393cc9339895f0076df41a652aded5b60
Reviewed-on: https://go-review.googlesource.com/42025
Run-TryBot: Michael Hudson-Doyle <michael.hudson@canonical.com>
TryBot-Result: Gobot Gobot <gobot@golang.org>
Reviewed-by: Brad Fitzpatrick <bradfitz@golang.org>
This commit is contained in:
Michael Hudson-Doyle 2017-04-28 12:43:06 +12:00
parent 3bcb481aa3
commit a69222d949
7 changed files with 21 additions and 11 deletions
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2
src/cmd/link/internal/arm64/asm.go
View file

@ -250,7 +250,7 @@ func archreloc(ctxt *ld.Link, r *ld.Reloc, s *ld.Symbol, val *int64) int {
// (https://sourceware.org/bugzilla/show_bug.cgi?id=18270). So
// we convert the adrp; ld64 + R_ARM64_GOTPCREL into adrp;
// add + R_ADDRARM64.
if !(r.Sym.Version != 0 || (r.Sym.Type&ld.SHIDDEN != 0) || r.Sym.Attr.Local()) && r.Sym.Type == ld.STEXT && ctxt.DynlinkingGo() {
if !(r.Sym.Version != 0 || r.Sym.Attr.VisibilityHidden() || r.Sym.Attr.Local()) && r.Sym.Type == ld.STEXT && ctxt.DynlinkingGo() {
if o2&0xffc00000 != 0xf9400000 {
ld.Errorf(s, "R_ARM64_GOTPCREL against unexpected instruction %x", o2)
}

2
src/cmd/link/internal/ld/data.go
View file

@ -386,7 +386,7 @@ func relocsym(ctxt *Link, s *Symbol) {
continue
}
if r.Sym != nil && (r.Sym.Type&(SMASK|SHIDDEN) == 0 || r.Sym.Type&SMASK == SXREF) {
if r.Sym != nil && ((r.Sym.Type == 0 && !r.Sym.Attr.VisibilityHidden()) || r.Sym.Type&SMASK == SXREF) {
// When putting the runtime but not main into a shared library
// these symbols are undefined and that's OK.
if Buildmode == BuildmodeShared {

9
src/cmd/link/internal/ld/ldelf.go
View file

@ -1060,8 +1060,7 @@ func readelfsym(ctxt *Link, elfobj *ElfObj, i int, sym *ElfSym, needSym int, loc
// set dupok generally. See http://codereview.appspot.com/5823055/
// comment #5 for details.
if s != nil && sym.other == 2 {
s.Type |= SHIDDEN
s.Attr |= AttrDuplicateOK
s.Attr |= AttrDuplicateOK | AttrVisibilityHidden
}
}
@ -1077,7 +1076,7 @@ func readelfsym(ctxt *Link, elfobj *ElfObj, i int, sym *ElfSym, needSym int, loc
// so put it in the hash table.
if needSym != 0 {
s = ctxt.Syms.Lookup(sym.name, localSymVersion)
s.Type |= SHIDDEN
s.Attr |= AttrVisibilityHidden
}
break
@ -1089,14 +1088,14 @@ func readelfsym(ctxt *Link, elfobj *ElfObj, i int, sym *ElfSym, needSym int, loc
// don't bother to add them into the hash table
s = ctxt.Syms.newsym(sym.name, localSymVersion)
s.Type |= SHIDDEN
s.Attr |= AttrVisibilityHidden
}
case ElfSymBindWeak:
if needSym != 0 {
s = ctxt.Syms.Lookup(sym.name, 0)
if sym.other == 2 {
s.Type |= SHIDDEN
s.Attr |= AttrVisibilityHidden
}
}

6
src/cmd/link/internal/ld/link.go
View file

@ -135,6 +135,11 @@ const (
// AttrMakeTypelink Amarks types that should be added to the typelink
// table. See typelinks.go:typelinks().
AttrMakeTypelink
// AttrVisibilityHidden symbols are ELF symbols with
// visibility set to STV_HIDDEN. They become local symbols in
// the final executable. Only relevant when internally linking
// on an ELF platform.
AttrVisibilityHidden
)
func (a Attribute) DuplicateOK() bool { return a&AttrDuplicateOK != 0 }
@ -150,6 +155,7 @@ func (a Attribute) OnList() bool { return a&AttrOnList != 0 }
func (a Attribute) Local() bool { return a&AttrLocal != 0 }
func (a Attribute) ReflectMethod() bool { return a&AttrReflectMethod != 0 }
func (a Attribute) MakeTypelink() bool { return a&AttrMakeTypelink != 0 }
func (a Attribute) VisibilityHidden() bool { return a&AttrVisibilityHidden != 0 }
func (a Attribute) CgoExport() bool {
return a.CgoExportDynamic() || a.CgoExportStatic()

4
src/cmd/link/internal/ld/pe.go
View file

@ -1041,7 +1041,9 @@ func writePESymTableRecords(ctxt *Link) int {
typ = 0x0308 // "array of structs"
}
class := IMAGE_SYM_CLASS_EXTERNAL
if s.Version != 0 || (s.Type&SHIDDEN != 0) || s.Attr.Local() {
// TODO(mwudson): I think s.Attr.VisibilityHidden()
// can only ever be true for an ELF link.
if s.Version != 0 || s.Attr.VisibilityHidden() || s.Attr.Local() {
class = IMAGE_SYM_CLASS_STATIC
}
writeOneSymbol(s, value, sect, typ, uint8(class))

1
src/cmd/link/internal/ld/symkind.go
View file

@ -106,7 +106,6 @@ const (
SDWARFINFO
SSUB = SymKind(1 << 8)
SMASK = SymKind(SSUB - 1)
SHIDDEN = SymKind(1 << 9)
SCONTAINER = SymKind(1 << 10) // has a sub-symbol
)

8
src/cmd/link/internal/ld/symtab.go
View file

@ -127,7 +127,7 @@ func putelfsym(ctxt *Link, x *Symbol, s string, t SymbolType, addr int64, go_ *S
// maybe one day STB_WEAK.
bind := STB_GLOBAL
if x.Version != 0 || (x.Type&SHIDDEN != 0) || x.Attr.Local() {
if x.Version != 0 || x.Attr.VisibilityHidden() || x.Attr.Local() {
bind = STB_LOCAL
}
@ -144,7 +144,11 @@ func putelfsym(ctxt *Link, x *Symbol, s string, t SymbolType, addr int64, go_ *S
addr -= int64(xo.Sect.Vaddr)
}
other := STV_DEFAULT
if x.Type&SHIDDEN != 0 {
if x.Attr.VisibilityHidden() {
// TODO(mwhudson): We only set AttrVisibilityHidden in ldelf,
// i.e. when internally linking. But STV_HIDDEN visibility only
// matters in object files, i.e. when externally linking. So I
// don't think this makes a lot of sense.
other = STV_HIDDEN
}
if (Buildmode == BuildmodeCArchive || Buildmode == BuildmodePIE || ctxt.DynlinkingGo()) && SysArch.Family == sys.PPC64 && typ == STT_FUNC && x.Name != "runtime.duffzero" && x.Name != "runtime.duffcopy" {