)

const (
	defaultAddr2line = "addr2line"

	// addr2line may produce multiple lines of output. We
	// use this sentinel to identify the end of the output.
	sentinel = ^uint64(0)
)

// addr2Liner is a connection to an addr2line command for obtaining
// address and line number information from a binary.
type addr2Liner struct {
	mu   sync.Mutex
	rw   lineReaderWriter
	base uint64

		f.addr2linernm = addr2liner
	}
	return f.addr2linernm.addrInfo(addr)
}

// fileAddr2Line implements the binutils.ObjFile interface, using
// llvm-symbolizer, if that's available, or addr2line to map addresses to
// symbols (with file/line number information). It can be slow for large
// binaries with debug information.
type fileAddr2Line struct {
	once sync.Once
	file
	addr2liner     *addr2Liner

// limitations under the License.

// Package symbolizer provides a routine to populate a profile with
// symbol, file and line number information. It relies on the
// addr2liner and demangle packages to do the actual work.
package symbolizer

import (
	"fmt"
	"io"
	"net/http"
	"net/url"
	"path/filepath"
	"strings"

	"github.com/google/pprof/internal/binutils"

	"bytes"
	"io"
	"os/exec"
	"strconv"
	"strings"

	"github.com/google/pprof/internal/plugin"
)

const (
	defaultNM = "nm"
)

// addr2LinerNM is a connection to an nm command for obtaining symbol
// information from a binary.
type addr2LinerNM struct {
	m []symbolInfo // Sorted list of symbol addresses from binary.
}

type symbolInfo struct {
	address uint64
	size    uint64
	name    string

	const expand = 5
	for i, f := range funcs {
		if i == 0 {
			// Extend backwards, stopping at line number 1, but do not disturb 0
			// since that is a special line number that can show up when addr2line
			// cannot determine the real line number.
			if f.begin > expand {
				f.begin -= expand
			} else if f.begin > 1 {
				f.begin = 1
			}
		} else {

pkg debug/elf, method (*File) DynamicSymbols() ([]Symbol, error)
pkg debug/elf, var ErrNoSymbols error

# CL 106460044 debug/plan9obj, cmd/addr2line: on Plan 9 use a.out header, Aram Hăvărneanu <******@****.***>
pkg debug/plan9obj, type FileHeader struct, HdrSize uint64
pkg debug/plan9obj, type FileHeader struct, LoadAddress uint64

ed-Key":"IAAfAMzCpXnsDGC2skt6==","X-Minio-Internal-Server-Side-Encryption-Seal-Algorithm":"DAREv2-HMAC-SHA256","content-type":"application/octet-stream"}},{"Bucket":"buck1","Name":"go_113/src/cmd/vendor/github.com/google/pprof/internal/binutils/addr2liner.go","UserDef":{"X-Minio-Internal-Server-Side-Encryption-Iv":"FYDltXqXrDknyTy9R2ON+9sEvdUUpw=","X-Minio-Internal-Server-Side-Encryption-S3-Kms-Key-Id":"my-minio-key","X-Minio-Internal-Server-Side-Encryption-S3-Kms-Sealed-Key":"IAAfAO3y3coZ2+4rXy...