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// Copyright 2013 The Go Authors. All rights reserved.
// Use of this source code is governed by a BSD-style
// license that can be found in the LICENSE file.
// Parsing of Go intermediate object files and archives.
package objfile
import (
"cmd/internal/goobj"
"fmt"
"os"
)
type goobjFile struct {
goobj *goobj.Package
}
func openGoobj(r *os.File) (rawFile, error) {
f, err := goobj.Parse(r, `""`)
if err != nil {
return nil, err
}
return &goobjFile{f}, nil
}
func goobjName(id goobj.SymID) string {
if id.Version == 0 {
return id.Name
}
return fmt.Sprintf("%s<%d>", id.Name, id.Version)
}
func (f *goobjFile) symbols() ([]Sym, error) {
seen := make(map[goobj.SymID]bool)
var syms []Sym
for _, s := range f.goobj.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 f.goobj.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, nil
}
// pcln does not make sense for Go object files, because each
// symbol has its own individual pcln table, so there is no global
// space of addresses to map.
func (f *goobjFile) pcln() (textStart uint64, symtab, pclntab []byte, err error) {
return 0, nil, nil, fmt.Errorf("pcln not available in go object file")
}
// text does not make sense for Go object files, because
// each function has a separate section.
func (f *goobjFile) text() (textStart uint64, text []byte, err error) {
return 0, nil, fmt.Errorf("text not available in go object file")
}
// goarch makes sense but is not exposed in debug/goobj's API,
// and we don't need it yet for any users of internal/objfile.
func (f *goobjFile) goarch() string {
return "GOARCH unimplemented for debug/goobj files"
}
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