func main() {
f, err := os.Open(os.Args[1])
if err != nil {
log.Fatal(err)
}
pkg, err := goobj.Parse(f, "main")
if err != nil {
log.Fatal(err)
}
js, err := json.MarshalIndent(pkg, "", "\t")
if err != nil {
log.Fatal(err)
}
os.Stdout.WriteString(string(js) + "\n")
}
func goobjSymbols(f *os.File) []Sym {
pkg, err := goobj.Parse(f, `""`)
if err != nil {
errorf("parsing %s: %v", f.Name(), err)
return nil
}
seen := make(map[goobj.SymID]bool)
var syms []Sym
for _, s := range pkg.Syms {
seen[s.SymID] = true
sym := Sym{Addr: uint64(s.Data.Offset), Name: goobjName(s.SymID), Size: int64(s.Size), Type: s.Type.Name, Code: '?'}
switch s.Kind {
case goobj.STEXT, goobj.SELFRXSECT:
sym.Code = 'T'
case goobj.STYPE, goobj.SSTRING, goobj.SGOSTRING, goobj.SGOFUNC, goobj.SRODATA, goobj.SFUNCTAB, goobj.STYPELINK, goobj.SSYMTAB, goobj.SPCLNTAB, goobj.SELFROSECT:
sym.Code = 'R'
case goobj.SMACHOPLT, goobj.SELFSECT, goobj.SMACHO, goobj.SMACHOGOT, goobj.SNOPTRDATA, goobj.SINITARR, goobj.SDATA, goobj.SWINDOWS:
sym.Code = 'D'
case goobj.SBSS, goobj.SNOPTRBSS, goobj.STLSBSS:
sym.Code = 'B'
case goobj.SXREF, goobj.SMACHOSYMSTR, goobj.SMACHOSYMTAB, goobj.SMACHOINDIRECTPLT, goobj.SMACHOINDIRECTGOT, goobj.SFILE, goobj.SFILEPATH, goobj.SCONST, goobj.SDYNIMPORT, goobj.SHOSTOBJ:
sym.Code = 'X' // should not see
}
if s.Version != 0 {
sym.Code += 'a' - 'A'
}
syms = append(syms, sym)
}
for _, s := range pkg.Syms {
for _, r := range s.Reloc {
if !seen[r.Sym] {
seen[r.Sym] = true
sym := Sym{Name: goobjName(r.Sym), Code: 'U'}
if s.Version != 0 {
// should not happen but handle anyway
sym.Code = 'u'
}
syms = append(syms, sym)
}
}
}
return syms
}
// scanFile reads file to learn about the package with the given import path.
func (p *Prog) scanFile(pkgpath string, file string) {
pkg := &Package{
File: file,
}
p.Packages[pkgpath] = pkg
f, err := os.Open(file)
if err != nil {
p.errorf("%v", err)
return
}
gp, err := goobj.Parse(f, pkgpath)
f.Close()
if err != nil {
p.errorf("reading %s: %v", file, err)
return
}
// TODO(rsc): Change debug/goobj to record package name as gp.Name.
// TODO(rsc): If pkgpath == "main", check that gp.Name == "main".
pkg.Package = gp
for _, gs := range gp.Syms {
// TODO(rsc): Fix file format instead of this workaround.
if gs.Data.Size > 0 {
switch gs.Kind {
case goobj.SBSS:
gs.Kind = goobj.SDATA
case goobj.SNOPTRBSS:
gs.Kind = goobj.SNOPTRDATA
}
}
if gs.Version != 0 {
gs.Version += p.MaxVersion
}
for i := range gs.Reloc {
r := &gs.Reloc[i]
if r.Sym.Version != 0 {
r.Sym.Version += p.MaxVersion
}
if p.Syms[r.Sym] == nil {
p.Missing[r.Sym] = true
}
}
if gs.Func != nil {
for i := range gs.Func.FuncData {
fdata := &gs.Func.FuncData[i]
if fdata.Sym.Name != "" {
if fdata.Sym.Version != 0 {
fdata.Sym.Version += p.MaxVersion
}
if p.Syms[fdata.Sym] == nil {
p.Missing[fdata.Sym] = true
}
}
}
}
if old := p.Syms[gs.SymID]; old != nil {
// Duplicate definition of symbol. Is it okay?
// TODO(rsc): Write test for this code.
switch {
// If both symbols are BSS (no data), take max of sizes
// but otherwise ignore second symbol.
case old.Data.Size == 0 && gs.Data.Size == 0:
if old.Size < gs.Size {
old.Size = gs.Size
}
continue
// If one is in BSS and one is not, use the one that is not.
case old.Data.Size > 0 && gs.Data.Size == 0:
continue
case gs.Data.Size > 0 && old.Data.Size == 0:
break // install gs as new symbol below
// If either is marked as DupOK, we can keep either one.
// Keep the one that we saw first.
case old.DupOK || gs.DupOK:
continue
// Otherwise, there's an actual conflict:
default:
p.errorf("symbol %s defined in both %s and %s %v %v", gs.SymID, old.Package.File, file, old.Data, gs.Data)
continue
}
}
s := &Sym{
Sym: gs,
Package: pkg,
}
p.addSym(s)
delete(p.Missing, gs.SymID)
if s.Data.Size > int64(s.Size) {
p.errorf("%s: initialized data larger than symbol (%d > %d)", s, s.Data.Size, s.Size)
}
}
p.MaxVersion += pkg.MaxVersion
for i, pkgpath := range pkg.Imports {
// TODO(rsc): Fix file format to drop .a from recorded import path.
pkgpath = strings.TrimSuffix(pkgpath, ".a")
pkg.Imports[i] = pkgpath
p.scanImport(pkgpath)
}
}
