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