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Name	Size	Permission
testdata	[ DIR ]	drwxr-xr-x
attr_string.go	7.91 KB	-rw-r--r--
buf.go	3.72 KB	-rw-r--r--
class_string.go	1.13 KB	-rw-r--r--
const.go	13.56 KB	-rw-r--r--
entry.go	24.98 KB	-rw-r--r--
entry_test.go	5.47 KB	-rw-r--r--
export_test.go	199 B	-rw-r--r--
line.go	23.17 KB	-rw-r--r--
line_test.go	10.21 KB	-rw-r--r--
open.go	3.59 KB	-rw-r--r--
tag_string.go	3.95 KB	-rw-r--r--
type.go	17.95 KB	-rw-r--r--
type_test.go	6.07 KB	-rw-r--r--
typeunit.go	3.63 KB	-rw-r--r--
unit.go	2.64 KB	-rw-r--r--

Code Editor : open.go

// Copyright 2009 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 dwarf provides access to DWARF debugging information loaded from
// executable files, as defined in the DWARF 2.0 Standard at
// http://dwarfstd.org/doc/dwarf-2.0.0.pdf
package dwarf

import "encoding/binary"

// Data represents the DWARF debugging information
// loaded from an executable file (for example, an ELF or Mach-O executable).
type Data struct {
	// raw data
	abbrev   []byte
	aranges  []byte
	frame    []byte
	info     []byte
	line     []byte
	pubnames []byte
	ranges   []byte
	str      []byte

// New sections added in DWARF 5.
	addr       []byte
	lineStr    []byte
	strOffsets []byte

// parsed data
	abbrevCache map[uint64]abbrevTable
	bigEndian   bool
	order       binary.ByteOrder
	typeCache   map[Offset]Type
	typeSigs    map[uint64]*typeUnit
	unit        []unit
}

// New returns a new Data object initialized from the given parameters.
// Rather than calling this function directly, clients should typically use
// the DWARF method of the File type of the appropriate package debug/elf,
// debug/macho, or debug/pe.
//
// The []byte arguments are the data from the corresponding debug section
// in the object file; for example, for an ELF object, abbrev is the contents of
// the ".debug_abbrev" section.
func New(abbrev, aranges, frame, info, line, pubnames, ranges, str []byte) (*Data, error) {
	d := &Data{
		abbrev:      abbrev,
		aranges:     aranges,
		frame:       frame,
		info:        info,
		line:        line,
		pubnames:    pubnames,
		ranges:      ranges,
		str:         str,
		abbrevCache: make(map[uint64]abbrevTable),
		typeCache:   make(map[Offset]Type),
		typeSigs:    make(map[uint64]*typeUnit),
	}

// Sniff .debug_info to figure out byte order.
	// 32-bit DWARF: 4 byte length, 2 byte version.
	// 64-bit DWARf: 4 bytes of 0xff, 8 byte length, 2 byte version.
	if len(d.info) < 6 {
		return nil, DecodeError{"info", Offset(len(d.info)), "too short"}
	}
	offset := 4
	if d.info[0] == 0xff && d.info[1] == 0xff && d.info[2] == 0xff && d.info[3] == 0xff {
		if len(d.info) < 14 {
			return nil, DecodeError{"info", Offset(len(d.info)), "too short"}
		}
		offset = 12
	}
	// Fetch the version, a tiny 16-bit number (1, 2, 3, 4, 5).
	x, y := d.info[offset], d.info[offset+1]
	switch {
	case x == 0 && y == 0:
		return nil, DecodeError{"info", 4, "unsupported version 0"}
	case x == 0:
		d.bigEndian = true
		d.order = binary.BigEndian
	case y == 0:
		d.bigEndian = false
		d.order = binary.LittleEndian
	default:
		return nil, DecodeError{"info", 4, "cannot determine byte order"}
	}

u, err := d.parseUnits()
	if err != nil {
		return nil, err
	}
	d.unit = u
	return d, nil
}

// AddTypes will add one .debug_types section to the DWARF data. A
// typical object with DWARF version 4 debug info will have multiple
// .debug_types sections. The name is used for error reporting only,
// and serves to distinguish one .debug_types section from another.
func (d *Data) AddTypes(name string, types []byte) error {
	return d.parseTypes(name, types)
}

// AddSection adds another DWARF section by name. The name should be a
// DWARF section name such as ".debug_addr", ".debug_str_offsets", and
// so forth. This approach is used for new DWARF sections added in
// DWARF 5 and later.
func (d *Data) AddSection(name string, contents []byte) error {
	switch name {
	case ".debug_addr":
		d.addr = contents
	case ".debug_line_str":
		d.lineStr = contents
	case ".debug_str_offsets":
		d.strOffsets = contents
	}
	// Just ignore names that we don't yet support.
	return nil
}

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Code Editor : open.go