golang symkind 代码
文件路径：/src/cmd/link/internal/sym/symkind.go
/ Derived from Inferno utils/6l/l.h and related files.
/ https://bitbucket.org/inferno-os/inferno-os/src/master/utils/6l/l.h
/
/ Copyright © 1994-1999 Lucent Technologies Inc. All rights reserved.
/ Portions Copyright © 1995-1997 C H Forsyth (forsyth@terzarima.net)
/ Portions Copyright © 1997-1999 Vita Nuova Limited
/ Portions Copyright © 2000-2007 Vita Nuova Holdings Limited (www.vitanuova.com)
/ Portions Copyright © 2004,2006 Bruce Ellis
/ Portions Copyright © 2005-2007 C H Forsyth (forsyth@terzarima.net)
/ Revisions Copyright © 2000-2007 Lucent Technologies Inc. and others
/ Portions Copyright © 2009 The Go Authors. All rights reserved.
/
/ Permission is hereby granted, free of charge, to any person obtaining a copy
/ of this software and associated documentation files (the "Software"), to deal
/ in the Software without restriction, including without limitation the rights
/ to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
/ copies of the Software, and to permit persons to whom the Software is
/ furnished to do so, subject to the following conditions:
/
/ The above copyright notice and this permission notice shall be included in
/ all copies or substantial portions of the Software.
/
/ THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
/ IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
/ FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
/ AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
/ LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
/ OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
/ THE SOFTWARE.
package sym
import "cmd/internal/objabi"
/ A SymKind describes the kind of memory represented by a symbol.
type SymKind uint8
/ Defined SymKind values.
/
/ TODO(rsc): Give idiomatic Go names.
/
/go:generate stringer -type=SymKind
const (
Sxxx SymKind = iota
STEXT
SELFRXSECT
SMACHOPLT
/ Read-only sections.
STYPE
SSTRING
SGOSTRING
SGOFUNC
SGCBITS
SRODATA
SFUNCTAB
SELFROSECT
/ 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.
SFirstWritable
SBUILDINFO
SELFSECT
SMACHO
SMACHOGOT
SWINDOWS
SELFGOT
SNOPTRDATA
SINITARR
SDATA
SXCOFFTOC
SBSS
SNOPTRBSS
SLIBFUZZER_8BIT_COUNTER
STLSBSS
SXREF
SMACHOSYMSTR
SMACHOSYMTAB
SMACHOINDIRECTPLT
SMACHOINDIRECTGOT
SFILEPATH
SDYNIMPORT
SHOSTOBJ
SUNDEFEXT / Undefined symbol for resolution by external linker
/ Sections for debugging information
SDWARFSECT
/ DWARF symbol types
SDWARFCUINFO
SDWARFCONST
SDWARFFCN
SDWARFABSFCN
SDWARFTYPE
SDWARFVAR
SDWARFRANGE
SDWARFLOC
SDWARFLINES
)
/ AbiSymKindToSymKind maps values read from object files (which are
/ of type cmd/internal/objabi.SymKind) to values of type SymKind.
var AbiSymKindToSymKind = [...]SymKind{
objabi.Sxxx: Sxxx,
objabi.STEXT: STEXT,
objabi.SRODATA: SRODATA,
objabi.SNOPTRDATA: SNOPTRDATA,
objabi.SDATA: SDATA,
objabi.SBSS: SBSS,
objabi.SNOPTRBSS: SNOPTRBSS,
objabi.STLSBSS: STLSBSS,
objabi.SDWARFCUINFO: SDWARFCUINFO,
objabi.SDWARFCONST: SDWARFCONST,
objabi.SDWARFFCN: SDWARFFCN,
objabi.SDWARFABSFCN: SDWARFABSFCN,
objabi.SDWARFTYPE: SDWARFTYPE,
objabi.SDWARFVAR: SDWARFVAR,
objabi.SDWARFRANGE: SDWARFRANGE,
objabi.SDWARFLOC: SDWARFLOC,
objabi.SDWARFLINES: SDWARFLINES,
objabi.SLIBFUZZER_8BIT_COUNTER: SLIBFUZZER_8BIT_COUNTER,
}
/ 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,
}
/ IsData returns true if the type is a data type.
func (t SymKind) IsData() bool {
return t == SDATA || t == SNOPTRDATA || t == SBSS || t == SNOPTRBSS
}