mirror of
https://github.com/42wim/matterbridge.git
synced 2025-11-03 23:37:24 +01:00
130 lines
3.2 KiB
Go
130 lines
3.2 KiB
Go
// Copyright 2014 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.
|
|
|
|
// Package objfile implements portable access to OS-specific executable files.
|
|
package objfile
|
|
|
|
import (
|
|
"debug/dwarf"
|
|
"debug/gosym"
|
|
"fmt"
|
|
"os"
|
|
"sort"
|
|
)
|
|
|
|
type rawFile interface {
|
|
symbols() (syms []Sym, err error)
|
|
pcln() (textStart uint64, symtab, pclntab []byte, err error)
|
|
text() (textStart uint64, text []byte, err error)
|
|
goarch() string
|
|
loadAddress() (uint64, error)
|
|
dwarf() (*dwarf.Data, error)
|
|
}
|
|
|
|
// A File is an opened executable file.
|
|
type File struct {
|
|
r *os.File
|
|
raw rawFile
|
|
}
|
|
|
|
// A Sym is a symbol defined in an executable file.
|
|
type Sym struct {
|
|
Name string // symbol name
|
|
Addr uint64 // virtual address of symbol
|
|
Size int64 // size in bytes
|
|
Code rune // nm code (T for text, D for data, and so on)
|
|
Type string // XXX?
|
|
Relocs []Reloc // in increasing Addr order
|
|
}
|
|
|
|
type Reloc struct {
|
|
Addr uint64 // Address of first byte that reloc applies to.
|
|
Size uint64 // Number of bytes
|
|
Stringer RelocStringer
|
|
}
|
|
|
|
type RelocStringer interface {
|
|
// insnOffset is the offset of the instruction containing the relocation
|
|
// from the start of the symbol containing the relocation.
|
|
String(insnOffset uint64) string
|
|
}
|
|
|
|
var openers = []func(*os.File) (rawFile, error){
|
|
openElf,
|
|
// openGoobj, // TODO(jbd): Bring it back when 1.8 is popular.
|
|
openMacho,
|
|
openPE,
|
|
openPlan9,
|
|
}
|
|
|
|
// Open opens the named file.
|
|
// The caller must call f.Close when the file is no longer needed.
|
|
func Open(name string) (*File, error) {
|
|
r, err := os.Open(name)
|
|
if err != nil {
|
|
return nil, err
|
|
}
|
|
for _, try := range openers {
|
|
if raw, err := try(r); err == nil {
|
|
return &File{r, raw}, nil
|
|
}
|
|
}
|
|
r.Close()
|
|
return nil, fmt.Errorf("open %s: unrecognized object file", name)
|
|
}
|
|
|
|
func (f *File) Close() error {
|
|
return f.r.Close()
|
|
}
|
|
|
|
func (f *File) Symbols() ([]Sym, error) {
|
|
syms, err := f.raw.symbols()
|
|
if err != nil {
|
|
return nil, err
|
|
}
|
|
sort.Sort(byAddr(syms))
|
|
return syms, nil
|
|
}
|
|
|
|
type byAddr []Sym
|
|
|
|
func (x byAddr) Less(i, j int) bool { return x[i].Addr < x[j].Addr }
|
|
func (x byAddr) Len() int { return len(x) }
|
|
func (x byAddr) Swap(i, j int) { x[i], x[j] = x[j], x[i] }
|
|
|
|
func (f *File) PCLineTable() (Liner, error) {
|
|
// If the raw file implements Liner directly, use that.
|
|
// Currently, only Go intermediate objects and archives (goobj) use this path.
|
|
if pcln, ok := f.raw.(Liner); ok {
|
|
return pcln, nil
|
|
}
|
|
// Otherwise, read the pcln tables and build a Liner out of that.
|
|
textStart, symtab, pclntab, err := f.raw.pcln()
|
|
if err != nil {
|
|
return nil, err
|
|
}
|
|
return gosym.NewTable(symtab, gosym.NewLineTable(pclntab, textStart))
|
|
}
|
|
|
|
func (f *File) Text() (uint64, []byte, error) {
|
|
return f.raw.text()
|
|
}
|
|
|
|
func (f *File) GOARCH() string {
|
|
return f.raw.goarch()
|
|
}
|
|
|
|
// LoadAddress returns the expected load address of the file.
|
|
// This differs from the actual load address for a position-independent
|
|
// executable.
|
|
func (f *File) LoadAddress() (uint64, error) {
|
|
return f.raw.loadAddress()
|
|
}
|
|
|
|
// DWARF returns DWARF debug data for the file, if any.
|
|
// This is for cmd/pprof to locate cgo functions.
|
|
func (f *File) DWARF() (*dwarf.Data, error) {
|
|
return f.raw.dwarf()
|
|
}
|