"fmt"
	"os"
	"strings"
)

func usage() {
	fmt.Fprintf(os.Stderr, "checkdwarf executable-or-library DIE-suffix\n")
}

type dwarfer interface {
	DWARF() (*dwarf.Data, error)
}

func openElf(path string) dwarfer {
	exe, err := elf.Open(path)
	if err != nil {
		return nil
	}
	return exe
}

func openMacho(path string) dwarfer {
	exe, err := macho.Open(path)
	if err != nil {
		return nil

	// from the start of the symbol containing the relocation.
	String(insnOffset uint64) string
}

var openers = []func(io.ReaderAt) (rawFile, error){
	openElf,
	openMacho,
	openPE,
	openPlan9,
	openXcoff,
}

// Open opens the named file.
// The caller must call f.Close when the file is no longer needed.
func Open(name string) (*File, error) {

package objfile

import (
	"debug/dwarf"
	"debug/elf"
	"encoding/binary"
	"fmt"
	"io"
)

type elfFile struct {
	elf *elf.File
}

func openElf(r io.ReaderAt) (rawFile, error) {
	f, err := elf.NewFile(r)
	if err != nil {
		return nil, err
	}
	return &elfFile{f}, nil
}

func (f *elfFile) symbols() ([]Sym, error) {
	elfSyms, err := f.elf.Symbols()

		return nil, fmt.Errorf("error reading magic number from %s: %v", name, err)
	}

	elfMagic := string(header[:])

	// Match against supported file types.
	if elfMagic == elf.ELFMAG {
		f, err := b.openELF(name, start, limit, offset, relocationSymbol)
		if err != nil {
			return nil, fmt.Errorf("error reading ELF file %s: %v", name, err)
		}
		return f, nil
	}