diff options
Diffstat (limited to 'src/cmd/internal/objabi/symkind.go')
| -rw-r--r-- | src/cmd/internal/objabi/symkind.go | 96 |
1 files changed, 11 insertions, 85 deletions
diff --git a/src/cmd/internal/objabi/symkind.go b/src/cmd/internal/objabi/symkind.go index c1e88aabe1..6c2eecf8a5 100644 --- a/src/cmd/internal/objabi/symkind.go +++ b/src/cmd/internal/objabi/symkind.go @@ -36,102 +36,28 @@ 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 ( + // An otherwise invalid zero value for the type Sxxx SymKind = iota + // Executable instructions STEXT - SELFRXSECT - - // Read-only sections. - STYPE - SSTRING - SGOSTRING - SGOFUNC - SGCBITS + // Read only static data SRODATA - SFUNCTAB - - SELFROSECT - SMACHOPLT - - // Read-only sections with relocations. - // - // Types STYPE-SFUNCTAB above are written to the .rodata section by default. - // When linking a shared object, some conceptually "read only" types need to - // be written to by relocations and putting them in a section called - // ".rodata" interacts poorly with the system linkers. The GNU linkers - // support this situation by arranging for sections of the name - // ".data.rel.ro.XXX" to be mprotected read only by the dynamic linker after - // relocations have applied, so when the Go linker is creating a shared - // object it checks all objects of the above types and bumps any object that - // has a relocation to it to the corresponding type below, which are then - // written to sections with appropriate magic names. - STYPERELRO - SSTRINGRELRO - SGOSTRINGRELRO - SGOFUNCRELRO - SGCBITSRELRO - SRODATARELRO - SFUNCTABRELRO - - // Part of .data.rel.ro if it exists, otherwise part of .rodata. - STYPELINK - SITABLINK - SSYMTAB - SPCLNTAB - - // Writable sections. - SELFSECT - SMACHO - SMACHOGOT - SWINDOWS - SELFGOT + // Static data that does not contain any pointers SNOPTRDATA - SINITARR + // Static data SDATA + // Statically data that is initially all 0s SBSS + // Statically data that is initially all 0s and does not contain pointers SNOPTRBSS + // Thread-local data that is initally all 0s STLSBSS + // TODO(mwhudson): outside of the linker, these values are + // only checked for, not set, so they should be removed. SXREF - SMACHOSYMSTR - SMACHOSYMTAB - SMACHOINDIRECTPLT - SMACHOINDIRECTGOT - SFILE - SFILEPATH SCONST - SDYNIMPORT - SHOSTOBJ - SDWARFSECT + // Debugging data SDWARFINFO - 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, - 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, - SGOFUNC: SGOFUNCRELRO, - SGCBITS: SGCBITSRELRO, - SRODATA: SRODATARELRO, - SFUNCTAB: SFUNCTABRELRO, -} |