mirror of
https://codeberg.org/superseriousbusiness/gotosocial.git
synced 2024-12-30 12:58:16 +03:00
421 lines
12 KiB
Go
421 lines
12 KiB
Go
// Derived from Inferno utils/6l/obj.c and utils/6l/span.c
|
|
// https://bitbucket.org/inferno-os/inferno-os/src/master/utils/6l/obj.c
|
|
// https://bitbucket.org/inferno-os/inferno-os/src/master/utils/6l/span.c
|
|
//
|
|
// 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 obj
|
|
|
|
import (
|
|
"github.com/twitchyliquid64/golang-asm/goobj"
|
|
"github.com/twitchyliquid64/golang-asm/objabi"
|
|
"fmt"
|
|
"log"
|
|
"math"
|
|
"sort"
|
|
)
|
|
|
|
func Linknew(arch *LinkArch) *Link {
|
|
ctxt := new(Link)
|
|
ctxt.hash = make(map[string]*LSym)
|
|
ctxt.funchash = make(map[string]*LSym)
|
|
ctxt.statichash = make(map[string]*LSym)
|
|
ctxt.Arch = arch
|
|
ctxt.Pathname = objabi.WorkingDir()
|
|
|
|
if err := ctxt.Headtype.Set(objabi.GOOS); err != nil {
|
|
log.Fatalf("unknown goos %s", objabi.GOOS)
|
|
}
|
|
|
|
ctxt.Flag_optimize = true
|
|
return ctxt
|
|
}
|
|
|
|
// LookupDerived looks up or creates the symbol with name name derived from symbol s.
|
|
// The resulting symbol will be static iff s is.
|
|
func (ctxt *Link) LookupDerived(s *LSym, name string) *LSym {
|
|
if s.Static() {
|
|
return ctxt.LookupStatic(name)
|
|
}
|
|
return ctxt.Lookup(name)
|
|
}
|
|
|
|
// LookupStatic looks up the static symbol with name name.
|
|
// If it does not exist, it creates it.
|
|
func (ctxt *Link) LookupStatic(name string) *LSym {
|
|
s := ctxt.statichash[name]
|
|
if s == nil {
|
|
s = &LSym{Name: name, Attribute: AttrStatic}
|
|
ctxt.statichash[name] = s
|
|
}
|
|
return s
|
|
}
|
|
|
|
// LookupABI looks up a symbol with the given ABI.
|
|
// If it does not exist, it creates it.
|
|
func (ctxt *Link) LookupABI(name string, abi ABI) *LSym {
|
|
return ctxt.LookupABIInit(name, abi, nil)
|
|
}
|
|
|
|
// LookupABI looks up a symbol with the given ABI.
|
|
// If it does not exist, it creates it and
|
|
// passes it to init for one-time initialization.
|
|
func (ctxt *Link) LookupABIInit(name string, abi ABI, init func(s *LSym)) *LSym {
|
|
var hash map[string]*LSym
|
|
switch abi {
|
|
case ABI0:
|
|
hash = ctxt.hash
|
|
case ABIInternal:
|
|
hash = ctxt.funchash
|
|
default:
|
|
panic("unknown ABI")
|
|
}
|
|
|
|
ctxt.hashmu.Lock()
|
|
s := hash[name]
|
|
if s == nil {
|
|
s = &LSym{Name: name}
|
|
s.SetABI(abi)
|
|
hash[name] = s
|
|
if init != nil {
|
|
init(s)
|
|
}
|
|
}
|
|
ctxt.hashmu.Unlock()
|
|
return s
|
|
}
|
|
|
|
// Lookup looks up the symbol with name name.
|
|
// If it does not exist, it creates it.
|
|
func (ctxt *Link) Lookup(name string) *LSym {
|
|
return ctxt.LookupInit(name, nil)
|
|
}
|
|
|
|
// LookupInit looks up the symbol with name name.
|
|
// If it does not exist, it creates it and
|
|
// passes it to init for one-time initialization.
|
|
func (ctxt *Link) LookupInit(name string, init func(s *LSym)) *LSym {
|
|
ctxt.hashmu.Lock()
|
|
s := ctxt.hash[name]
|
|
if s == nil {
|
|
s = &LSym{Name: name}
|
|
ctxt.hash[name] = s
|
|
if init != nil {
|
|
init(s)
|
|
}
|
|
}
|
|
ctxt.hashmu.Unlock()
|
|
return s
|
|
}
|
|
|
|
func (ctxt *Link) Float32Sym(f float32) *LSym {
|
|
i := math.Float32bits(f)
|
|
name := fmt.Sprintf("$f32.%08x", i)
|
|
return ctxt.LookupInit(name, func(s *LSym) {
|
|
s.Size = 4
|
|
s.WriteFloat32(ctxt, 0, f)
|
|
s.Type = objabi.SRODATA
|
|
s.Set(AttrLocal, true)
|
|
s.Set(AttrContentAddressable, true)
|
|
ctxt.constSyms = append(ctxt.constSyms, s)
|
|
})
|
|
}
|
|
|
|
func (ctxt *Link) Float64Sym(f float64) *LSym {
|
|
i := math.Float64bits(f)
|
|
name := fmt.Sprintf("$f64.%016x", i)
|
|
return ctxt.LookupInit(name, func(s *LSym) {
|
|
s.Size = 8
|
|
s.WriteFloat64(ctxt, 0, f)
|
|
s.Type = objabi.SRODATA
|
|
s.Set(AttrLocal, true)
|
|
s.Set(AttrContentAddressable, true)
|
|
ctxt.constSyms = append(ctxt.constSyms, s)
|
|
})
|
|
}
|
|
|
|
func (ctxt *Link) Int64Sym(i int64) *LSym {
|
|
name := fmt.Sprintf("$i64.%016x", uint64(i))
|
|
return ctxt.LookupInit(name, func(s *LSym) {
|
|
s.Size = 8
|
|
s.WriteInt(ctxt, 0, 8, i)
|
|
s.Type = objabi.SRODATA
|
|
s.Set(AttrLocal, true)
|
|
s.Set(AttrContentAddressable, true)
|
|
ctxt.constSyms = append(ctxt.constSyms, s)
|
|
})
|
|
}
|
|
|
|
// Assign index to symbols.
|
|
// asm is set to true if this is called by the assembler (i.e. not the compiler),
|
|
// in which case all the symbols are non-package (for now).
|
|
func (ctxt *Link) NumberSyms() {
|
|
if ctxt.Headtype == objabi.Haix {
|
|
// Data must be sorted to keep a constant order in TOC symbols.
|
|
// As they are created during Progedit, two symbols can be switched between
|
|
// two different compilations. Therefore, BuildID will be different.
|
|
// TODO: find a better place and optimize to only sort TOC symbols
|
|
sort.Slice(ctxt.Data, func(i, j int) bool {
|
|
return ctxt.Data[i].Name < ctxt.Data[j].Name
|
|
})
|
|
}
|
|
|
|
// Constant symbols are created late in the concurrent phase. Sort them
|
|
// to ensure a deterministic order.
|
|
sort.Slice(ctxt.constSyms, func(i, j int) bool {
|
|
return ctxt.constSyms[i].Name < ctxt.constSyms[j].Name
|
|
})
|
|
ctxt.Data = append(ctxt.Data, ctxt.constSyms...)
|
|
ctxt.constSyms = nil
|
|
|
|
ctxt.pkgIdx = make(map[string]int32)
|
|
ctxt.defs = []*LSym{}
|
|
ctxt.hashed64defs = []*LSym{}
|
|
ctxt.hasheddefs = []*LSym{}
|
|
ctxt.nonpkgdefs = []*LSym{}
|
|
|
|
var idx, hashedidx, hashed64idx, nonpkgidx int32
|
|
ctxt.traverseSyms(traverseDefs, func(s *LSym) {
|
|
// if Pkgpath is unknown, cannot hash symbols with relocations, as it
|
|
// may reference named symbols whose names are not fully expanded.
|
|
if s.ContentAddressable() && (ctxt.Pkgpath != "" || len(s.R) == 0) {
|
|
if len(s.P) <= 8 && len(s.R) == 0 { // we can use short hash only for symbols without relocations
|
|
s.PkgIdx = goobj.PkgIdxHashed64
|
|
s.SymIdx = hashed64idx
|
|
if hashed64idx != int32(len(ctxt.hashed64defs)) {
|
|
panic("bad index")
|
|
}
|
|
ctxt.hashed64defs = append(ctxt.hashed64defs, s)
|
|
hashed64idx++
|
|
} else {
|
|
s.PkgIdx = goobj.PkgIdxHashed
|
|
s.SymIdx = hashedidx
|
|
if hashedidx != int32(len(ctxt.hasheddefs)) {
|
|
panic("bad index")
|
|
}
|
|
ctxt.hasheddefs = append(ctxt.hasheddefs, s)
|
|
hashedidx++
|
|
}
|
|
} else if isNonPkgSym(ctxt, s) {
|
|
s.PkgIdx = goobj.PkgIdxNone
|
|
s.SymIdx = nonpkgidx
|
|
if nonpkgidx != int32(len(ctxt.nonpkgdefs)) {
|
|
panic("bad index")
|
|
}
|
|
ctxt.nonpkgdefs = append(ctxt.nonpkgdefs, s)
|
|
nonpkgidx++
|
|
} else {
|
|
s.PkgIdx = goobj.PkgIdxSelf
|
|
s.SymIdx = idx
|
|
if idx != int32(len(ctxt.defs)) {
|
|
panic("bad index")
|
|
}
|
|
ctxt.defs = append(ctxt.defs, s)
|
|
idx++
|
|
}
|
|
s.Set(AttrIndexed, true)
|
|
})
|
|
|
|
ipkg := int32(1) // 0 is invalid index
|
|
nonpkgdef := nonpkgidx
|
|
ctxt.traverseSyms(traverseRefs|traverseAux, func(rs *LSym) {
|
|
if rs.PkgIdx != goobj.PkgIdxInvalid {
|
|
return
|
|
}
|
|
if !ctxt.Flag_linkshared {
|
|
// Assign special index for builtin symbols.
|
|
// Don't do it when linking against shared libraries, as the runtime
|
|
// may be in a different library.
|
|
if i := goobj.BuiltinIdx(rs.Name, int(rs.ABI())); i != -1 {
|
|
rs.PkgIdx = goobj.PkgIdxBuiltin
|
|
rs.SymIdx = int32(i)
|
|
rs.Set(AttrIndexed, true)
|
|
return
|
|
}
|
|
}
|
|
pkg := rs.Pkg
|
|
if rs.ContentAddressable() {
|
|
// for now, only support content-addressable symbols that are always locally defined.
|
|
panic("hashed refs unsupported for now")
|
|
}
|
|
if pkg == "" || pkg == "\"\"" || pkg == "_" || !rs.Indexed() {
|
|
rs.PkgIdx = goobj.PkgIdxNone
|
|
rs.SymIdx = nonpkgidx
|
|
rs.Set(AttrIndexed, true)
|
|
if nonpkgidx != nonpkgdef+int32(len(ctxt.nonpkgrefs)) {
|
|
panic("bad index")
|
|
}
|
|
ctxt.nonpkgrefs = append(ctxt.nonpkgrefs, rs)
|
|
nonpkgidx++
|
|
return
|
|
}
|
|
if k, ok := ctxt.pkgIdx[pkg]; ok {
|
|
rs.PkgIdx = k
|
|
return
|
|
}
|
|
rs.PkgIdx = ipkg
|
|
ctxt.pkgIdx[pkg] = ipkg
|
|
ipkg++
|
|
})
|
|
}
|
|
|
|
// Returns whether s is a non-package symbol, which needs to be referenced
|
|
// by name instead of by index.
|
|
func isNonPkgSym(ctxt *Link, s *LSym) bool {
|
|
if ctxt.IsAsm && !s.Static() {
|
|
// asm symbols are referenced by name only, except static symbols
|
|
// which are file-local and can be referenced by index.
|
|
return true
|
|
}
|
|
if ctxt.Flag_linkshared {
|
|
// The referenced symbol may be in a different shared library so
|
|
// the linker cannot see its index.
|
|
return true
|
|
}
|
|
if s.Pkg == "_" {
|
|
// The frontend uses package "_" to mark symbols that should not
|
|
// be referenced by index, e.g. linkname'd symbols.
|
|
return true
|
|
}
|
|
if s.DuplicateOK() {
|
|
// Dupok symbol needs to be dedup'd by name.
|
|
return true
|
|
}
|
|
return false
|
|
}
|
|
|
|
// StaticNamePref is the prefix the front end applies to static temporary
|
|
// variables. When turned into LSyms, these can be tagged as static so
|
|
// as to avoid inserting them into the linker's name lookup tables.
|
|
const StaticNamePref = ".stmp_"
|
|
|
|
type traverseFlag uint32
|
|
|
|
const (
|
|
traverseDefs traverseFlag = 1 << iota
|
|
traverseRefs
|
|
traverseAux
|
|
|
|
traverseAll = traverseDefs | traverseRefs | traverseAux
|
|
)
|
|
|
|
// Traverse symbols based on flag, call fn for each symbol.
|
|
func (ctxt *Link) traverseSyms(flag traverseFlag, fn func(*LSym)) {
|
|
lists := [][]*LSym{ctxt.Text, ctxt.Data, ctxt.ABIAliases}
|
|
for _, list := range lists {
|
|
for _, s := range list {
|
|
if flag&traverseDefs != 0 {
|
|
fn(s)
|
|
}
|
|
if flag&traverseRefs != 0 {
|
|
for _, r := range s.R {
|
|
if r.Sym != nil {
|
|
fn(r.Sym)
|
|
}
|
|
}
|
|
}
|
|
if flag&traverseAux != 0 {
|
|
if s.Gotype != nil {
|
|
fn(s.Gotype)
|
|
}
|
|
if s.Type == objabi.STEXT {
|
|
f := func(parent *LSym, aux *LSym) {
|
|
fn(aux)
|
|
}
|
|
ctxt.traverseFuncAux(flag, s, f)
|
|
}
|
|
}
|
|
}
|
|
}
|
|
}
|
|
|
|
func (ctxt *Link) traverseFuncAux(flag traverseFlag, fsym *LSym, fn func(parent *LSym, aux *LSym)) {
|
|
pc := &fsym.Func.Pcln
|
|
if flag&traverseAux == 0 {
|
|
// NB: should it become necessary to walk aux sym reloc references
|
|
// without walking the aux syms themselves, this can be changed.
|
|
panic("should not be here")
|
|
}
|
|
for _, d := range pc.Funcdata {
|
|
if d != nil {
|
|
fn(fsym, d)
|
|
}
|
|
}
|
|
files := ctxt.PosTable.FileTable()
|
|
usedFiles := make([]goobj.CUFileIndex, 0, len(pc.UsedFiles))
|
|
for f := range pc.UsedFiles {
|
|
usedFiles = append(usedFiles, f)
|
|
}
|
|
sort.Slice(usedFiles, func(i, j int) bool { return usedFiles[i] < usedFiles[j] })
|
|
for _, f := range usedFiles {
|
|
if filesym := ctxt.Lookup(files[f]); filesym != nil {
|
|
fn(fsym, filesym)
|
|
}
|
|
}
|
|
for _, call := range pc.InlTree.nodes {
|
|
if call.Func != nil {
|
|
fn(fsym, call.Func)
|
|
}
|
|
f, _ := linkgetlineFromPos(ctxt, call.Pos)
|
|
if filesym := ctxt.Lookup(f); filesym != nil {
|
|
fn(fsym, filesym)
|
|
}
|
|
}
|
|
dwsyms := []*LSym{fsym.Func.dwarfRangesSym, fsym.Func.dwarfLocSym, fsym.Func.dwarfDebugLinesSym, fsym.Func.dwarfInfoSym}
|
|
for _, dws := range dwsyms {
|
|
if dws == nil || dws.Size == 0 {
|
|
continue
|
|
}
|
|
fn(fsym, dws)
|
|
if flag&traverseRefs != 0 {
|
|
for _, r := range dws.R {
|
|
if r.Sym != nil {
|
|
fn(dws, r.Sym)
|
|
}
|
|
}
|
|
}
|
|
}
|
|
}
|
|
|
|
// Traverse aux symbols, calling fn for each sym/aux pair.
|
|
func (ctxt *Link) traverseAuxSyms(flag traverseFlag, fn func(parent *LSym, aux *LSym)) {
|
|
lists := [][]*LSym{ctxt.Text, ctxt.Data, ctxt.ABIAliases}
|
|
for _, list := range lists {
|
|
for _, s := range list {
|
|
if s.Gotype != nil {
|
|
if flag&traverseDefs != 0 {
|
|
fn(s, s.Gotype)
|
|
}
|
|
}
|
|
if s.Type != objabi.STEXT {
|
|
continue
|
|
}
|
|
ctxt.traverseFuncAux(flag, s, fn)
|
|
}
|
|
}
|
|
}
|