diff options
Diffstat (limited to 'src/cmd/internal/obj/link.go')
| -rw-r--r-- | src/cmd/internal/obj/link.go | 48 |
1 files changed, 41 insertions, 7 deletions
diff --git a/src/cmd/internal/obj/link.go b/src/cmd/internal/obj/link.go index ef1165d10b..513e00b825 100644 --- a/src/cmd/internal/obj/link.go +++ b/src/cmd/internal/obj/link.go @@ -316,7 +316,7 @@ const ( // An LSym is the sort of symbol that is written to an object file. type LSym struct { Name string - Type int16 + Type SymKind Version int16 Dupok bool Cfunc bool @@ -371,9 +371,16 @@ type Pcln struct { Lastindex int } -// LSym.type +// A SymKind describes the kind of memory represented by a symbol. +type SymKind int16 + +// Defined SymKind values. +// +// TODO(rsc): Give idiomatic Go names. +// TODO(rsc): Reduce the number of symbol types in the object files. +//go:generate stringer -type=SymKind const ( - Sxxx = iota + Sxxx SymKind = iota STEXT SELFRXSECT @@ -434,12 +441,39 @@ const ( SHOSTOBJ SDWARFSECT SDWARFINFO - SSUB = 1 << 8 - SMASK = SSUB - 1 - SHIDDEN = 1 << 9 - SCONTAINER = 1 << 10 // has a sub-symbol + SSUB = SymKind(1 << 8) + SMASK = SymKind(SSUB - 1) + SHIDDEN = SymKind(1 << 9) + SCONTAINER = SymKind(1 << 10) // has a sub-symbol ) +// ReadOnly are the symbol kinds that form read-only sections. In some +// cases, if they will require relocations, they are transformed into +// rel-ro sections using RelROMap. +var ReadOnly = []SymKind{ + STYPE, + SSTRING, + SGOSTRING, + SGOSTRINGHDR, + SGOFUNC, + SGCBITS, + SRODATA, + SFUNCTAB, +} + +// RelROMap describes the transformation of read-only symbols to rel-ro +// symbols. +var RelROMap = map[SymKind]SymKind{ + STYPE: STYPERELRO, + SSTRING: SSTRINGRELRO, + SGOSTRING: SGOSTRINGRELRO, + SGOSTRINGHDR: SGOSTRINGHDRRELRO, + SGOFUNC: SGOFUNCRELRO, + SGCBITS: SGCBITSRELRO, + SRODATA: SRODATARELRO, + SFUNCTAB: SFUNCTABRELRO, +} + type Reloc struct { Off int32 Siz uint8 |