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// Copyright 2018 Marc-Antoine Ruel. All rights reserved.
// Use of this source code is governed under the Apache License, Version 2.0
// that can be found in the LICENSE file.
package stack
import (
"bufio"
"bytes"
"errors"
"fmt"
"io"
"os"
"os/user"
"path/filepath"
"regexp"
"runtime"
"sort"
"strconv"
"strings"
)
// Context is a parsing context.
//
// It contains the deduced GOROOT and GOPATH, if guesspaths is true.
type Context struct {
// Goroutines is the Goroutines found.
//
// They are in the order that they were printed.
Goroutines []*Goroutine
// GOROOT is the GOROOT as detected in the traceback, not the on the host.
//
// It can be empty if no root was determined, for example the traceback
// contains only non-stdlib source references.
//
// Empty is guesspaths was false.
GOROOT string
// GOPATHs is the GOPATH as detected in the traceback, with the value being
// the corresponding path mapped to the host.
//
// It can be empty if only stdlib code is in the traceback or if no local
// sources were matched up. In the general case there is only one entry in
// the map.
//
// Nil is guesspaths was false.
GOPATHs map[string]string
localgoroot string
localgopaths []string
}
// ParseDump processes the output from runtime.Stack().
//
// Returns nil *Context if no stack trace was detected.
//
// It pipes anything not detected as a panic stack trace from r into out. It
// assumes there is junk before the actual stack trace. The junk is streamed to
// out.
//
// If guesspaths is false, no guessing of GOROOT and GOPATH is done, and Call
// entites do not have LocalSrcPath and IsStdlib filled in.
func ParseDump(r io.Reader, out io.Writer, guesspaths bool) (*Context, error) {
goroutines, err := parseDump(r, out)
if len(goroutines) == 0 {
return nil, err
}
c := &Context{
Goroutines: goroutines,
localgoroot: runtime.GOROOT(),
localgopaths: getGOPATHs(),
}
nameArguments(goroutines)
// Corresponding local values on the host for Context.
if guesspaths {
c.findRoots()
for _, r := range c.Goroutines {
// Note that this is important to call it even if
// c.GOROOT == c.localgoroot.
r.updateLocations(c.GOROOT, c.localgoroot, c.GOPATHs)
}
}
return c, err
}
// Private stuff.
const (
lockedToThread = "locked to thread"
elided = "...additional frames elided..."
raceHeaderFooter = "=================="
raceHeader = "WARNING: DATA RACE"
)
// These are effectively constants.
var (
// TODO(maruel): Handle corrupted stack cases:
// - missed stack barrier
// - found next stack barrier at 0x123; expected
// - runtime: unexpected return pc for FUNC_NAME called from 0x123
reRoutineHeader = regexp.MustCompile("^([ \t]*)goroutine (\\d+) \\[([^\\]]+)\\]\\:$")
reMinutes = regexp.MustCompile("^(\\d+) minutes$")
reUnavail = regexp.MustCompile("^(?:\t| +)goroutine running on other thread; stack unavailable")
// See gentraceback() in src/runtime/traceback.go for more information.
// - Sometimes the source file comes up as "<autogenerated>". It is the
// compiler than generated these, not the runtime.
// - The tab may be replaced with spaces when a user copy-paste it, handle
// this transparently.
// - "runtime.gopanic" is explicitly replaced with "panic" by gentraceback().
// - The +0x123 byte offset is printed when frame.pc > _func.entry. _func is
// generated by the linker.
// - The +0x123 byte offset is not included with generated code, e.g. unnamed
// functions "funcĀ·006()" which is generally go func() { ... }()
// statements. Since the _func is generated at runtime, it's probably why
// _func.entry is not set.
// - C calls may have fp=0x123 sp=0x123 appended. I think it normally happens
// when a signal is not correctly handled. It is printed with m.throwing>0.
// These are discarded.
// - For cgo, the source file may be "??".
reFile = regexp.MustCompile("^(?:\t| +)(\\?\\?|\\<autogenerated\\>|.+\\.(?:c|go|s))\\:(\\d+)(?:| \\+0x[0-9a-f]+)(?:| fp=0x[0-9a-f]+ sp=0x[0-9a-f]+(?:| pc=0x[0-9a-f]+))$")
// Sadly, it doesn't note the goroutine number so we could cascade them per
// parenthood.
reCreated = regexp.MustCompile("^created by (.+)$")
reFunc = regexp.MustCompile("^(.+)\\((.*)\\)$")
// See https://github.com/llvm/llvm-project/blob/master/compiler-rt/lib/tsan/rtl/tsan_report.cc
// for the code generating these messages. Please note only the block in
// #else // #if !SANITIZER_GO
// is used.
// TODO(maruel): " [failed to restore the stack]\n\n"
// TODO(maruel): "Global var %s of size %zu at %p declared at %s:%zu\n"
reRaceOperationHeader = regexp.MustCompile("^(Read|Write) at (0x[0-9a-f]+) by goroutine (\\d+):$")
reRacePreviousOperationHeader = regexp.MustCompile("^Previous (read|write) at (0x[0-9a-f]+) by goroutine (\\d+):$")
reRacePreviousOperationMainHeader = regexp.MustCompile("^Previous (read|write) at (0x[0-9a-f]+) by main goroutine:$")
reRaceGoroutine = regexp.MustCompile("^Goroutine (\\d+) \\((running|finished)\\) created at:$")
)
func parseDump(r io.Reader, out io.Writer) ([]*Goroutine, error) {
scanner := bufio.NewScanner(r)
scanner.Split(scanLines)
// Do not enable race detection parsing yet, since it cannot be returned in
// Context at the moment.
s := scanningState{}
for scanner.Scan() {
line, err := s.scan(scanner.Text())
if line != "" {
_, _ = io.WriteString(out, line)
}
if err != nil {
return s.goroutines, err
}
}
return s.goroutines, scanner.Err()
}
// scanLines is similar to bufio.ScanLines except that it:
// - doesn't drop '\n'
// - doesn't strip '\r'
// - returns when the data is bufio.MaxScanTokenSize bytes
func scanLines(data []byte, atEOF bool) (advance int, token []byte, err error) {
if atEOF && len(data) == 0 {
return 0, nil, nil
}
if i := bytes.IndexByte(data, '\n'); i >= 0 {
return i + 1, data[0 : i+1], nil
}
if atEOF {
return len(data), data, nil
}
if len(data) >= bufio.MaxScanTokenSize {
// Returns the line even if it is not at EOF nor has a '\n', otherwise the
// scanner will return bufio.ErrTooLong which is definitely not what we
// want.
return len(data), data, nil
}
return 0, nil, nil
}
// state is the state of the scan to detect and process a stack trace.
type state int
// Initial state is normal. Other states are when a stack trace is detected.
const (
// Outside a stack trace.
// to: gotRoutineHeader, raceHeader1
normal state = iota
// Panic stack trace:
// Empty line between goroutines.
// from: gotFileCreated, gotFileFunc
// to: gotRoutineHeader, normal
betweenRoutine
// Goroutine header was found, e.g. "goroutine 1 [running]:"
// from: normal
// to: gotUnavail, gotFunc
gotRoutineHeader
// Function call line was found, e.g. "main.main()"
// from: gotRoutineHeader
// to: gotFile
gotFunc
// Goroutine creation line was found, e.g. "created by main.glob..func4"
// from: gotFileFunc
// to: gotFileCreated
gotCreated
// File header was found, e.g. "\t/foo/bar/baz.go:116 +0x35"
// from: gotFunc
// to: gotFunc, gotCreated, betweenRoutine, normal
gotFileFunc
// File header was found, e.g. "\t/foo/bar/baz.go:116 +0x35"
// from: gotCreated
// to: betweenRoutine, normal
gotFileCreated
// State when the goroutine stack is instead is reUnavail.
// from: gotRoutineHeader
// to: betweenRoutine, gotCreated
gotUnavail
// Race detector:
// Got "=================="
// from: normal
// to: normal, gotRaceHeader
gotRaceHeader1
// Got "WARNING: DATA RACE"
// from: gotRaceHeader1
// to: normal, gotRaceOperationHeader
gotRaceHeader
// A race operation was found, e.g. "Read at 0x00c0000e4030 by goroutine 7:"
// from: gotRaceHeader
// to: normal, gotRaceOperationFunc
gotRaceOperationHeader
// Function that caused the race, e.g. " main.panicRace.func1()"
// from: gotRaceOperationHeader
// to: normal, gotRaceOperationFile
gotRaceOperationFunc
// Function that caused the race, e.g. " main.panicRace.func1()"
// from: gotRaceOperationFunc
// to: normal, betweenRaces
gotRaceOperationFile
// Goroutine header, e.g. "Goroutine 7 (running) created at:"
// from: betweenRaces
// to: normal, gotRaceOperationHeader
gotRaceGoroutineHeader
// Function that caused the race, e.g. " main.panicRace.func1()"
// from: gotRaceGoroutineHeader
// to: normal, gotRaceGoroutineFile
gotRaceGoroutineFunc
// Function that caused the race, e.g. " main.panicRace.func1()"
// from: gotRaceGoroutineFunc
// to: normal, betweenRaces
gotRaceGoroutineFile
// Empty line between goroutines.
// from: gotRaceOperationFile
// to: normal, gotRaceOperationHeader
betweenRaces
)
type raceOp struct {
write bool
addr uint64
id int
}
// scanningState is the state of the scan to detect and process a stack trace
// and stores the traces found.
type scanningState struct {
// Determines if race detection is enabled. Currently false since scan()
// would swallow the race detector output, but the data is not part of
// Context yet.
raceDetectionEnabled bool
// goroutines contains all the goroutines found.
goroutines []*Goroutine
state state
prefix string
races []raceOp
}
// scan scans one line, updates goroutines and move to the next state.
func (s *scanningState) scan(line string) (string, error) {
var cur *Goroutine
if len(s.goroutines) != 0 {
cur = s.goroutines[len(s.goroutines)-1]
}
trimmed := line
if strings.HasSuffix(line, "\r\n") {
trimmed = line[:len(line)-2]
} else if strings.HasSuffix(line, "\n") {
trimmed = line[:len(line)-1]
} else {
// There's two cases:
// - It's the end of the stream and it's not terminating with EOL character.
// - The line is longer than bufio.MaxScanTokenSize
if s.state == normal {
return line, nil
}
// Let it flow. It's possible the last line was trimmed and we still want to parse it.
}
if trimmed != "" && s.prefix != "" {
// This can only be the case if s.state != normal or the line is empty.
if !strings.HasPrefix(trimmed, s.prefix) {
prefix := s.prefix
s.state = normal
s.prefix = ""
return "", fmt.Errorf("inconsistent indentation: %q, expected %q", trimmed, prefix)
}
trimmed = trimmed[len(s.prefix):]
}
switch s.state {
case normal:
// We could look for '^panic:' but this is more risky, there can be a lot
// of junk between this and the stack dump.
fallthrough
case betweenRoutine:
// Look for a goroutine header.
if match := reRoutineHeader.FindStringSubmatch(trimmed); match != nil {
if id, err := strconv.Atoi(match[2]); err == nil {
// See runtime/traceback.go.
// "<state>, \d+ minutes, locked to thread"
items := strings.Split(match[3], ", ")
sleep := 0
locked := false
for i := 1; i < len(items); i++ {
if items[i] == lockedToThread {
locked = true
continue
}
// Look for duration, if any.
if match2 := reMinutes.FindStringSubmatch(items[i]); match2 != nil {
sleep, _ = strconv.Atoi(match2[1])
}
}
g := &Goroutine{
Signature: Signature{
State: items[0],
SleepMin: sleep,
SleepMax: sleep,
Locked: locked,
},
ID: id,
First: len(s.goroutines) == 0,
}
s.goroutines = append(s.goroutines, g)
s.state = gotRoutineHeader
s.prefix = match[1]
return "", nil
}
}
// Switch to race detection mode.
if s.raceDetectionEnabled && trimmed == raceHeaderFooter {
s.state = gotRaceHeader1
// Send the line to the user.
return line, nil
}
// Fallthrough.
s.state = normal
s.prefix = ""
return line, nil
case gotRoutineHeader:
if reUnavail.MatchString(trimmed) {
// Generate a fake stack entry.
cur.Stack.Calls = []Call{{SrcPath: "<unavailable>"}}
// Next line is expected to be an empty line.
s.state = gotUnavail
return "", nil
}
call, err := parseFunc(trimmed)
if call != nil {
cur.Stack.Calls = append(cur.Stack.Calls, *call)
s.state = gotFunc
return "", err
}
return "", fmt.Errorf("expected a function after a goroutine header, got: %q", strings.TrimSpace(trimmed))
case gotFunc:
// Look for a file.
if match := reFile.FindStringSubmatch(trimmed); match != nil {
num, err := strconv.Atoi(match[2])
if err != nil {
return "", fmt.Errorf("failed to parse int on line: %q", strings.TrimSpace(trimmed))
}
// cur.Stack.Calls is guaranteed to have at least one item.
i := len(cur.Stack.Calls) - 1
cur.Stack.Calls[i].SrcPath = match[1]
cur.Stack.Calls[i].Line = num
s.state = gotFileFunc
return "", nil
}
return "", fmt.Errorf("expected a file after a function, got: %q", strings.TrimSpace(trimmed))
case gotCreated:
// Look for a file.
if match := reFile.FindStringSubmatch(trimmed); match != nil {
num, err := strconv.Atoi(match[2])
if err != nil {
return "", fmt.Errorf("failed to parse int on line: %q", strings.TrimSpace(trimmed))
}
cur.CreatedBy.SrcPath = match[1]
cur.CreatedBy.Line = num
s.state = gotFileCreated
return "", nil
}
return "", fmt.Errorf("expected a file after a created line, got: %q", trimmed)
case gotFileFunc:
if match := reCreated.FindStringSubmatch(trimmed); match != nil {
cur.CreatedBy.Func.Raw = match[1]
s.state = gotCreated
return "", nil
}
if elided == trimmed {
cur.Stack.Elided = true
// TODO(maruel): New state.
return "", nil
}
call, err := parseFunc(trimmed)
if call != nil {
cur.Stack.Calls = append(cur.Stack.Calls, *call)
s.state = gotFunc
return "", err
}
if trimmed == "" {
s.state = betweenRoutine
return "", nil
}
// Back to normal state.
s.state = normal
s.prefix = ""
return line, nil
case gotFileCreated:
if trimmed == "" {
s.state = betweenRoutine
return "", nil
}
s.state = normal
s.prefix = ""
return line, nil
case gotUnavail:
if trimmed == "" {
s.state = betweenRoutine
return "", nil
}
if match := reCreated.FindStringSubmatch(trimmed); match != nil {
cur.CreatedBy.Func.Raw = match[1]
s.state = gotCreated
return "", nil
}
return "", fmt.Errorf("expected empty line after unavailable stack, got: %q", strings.TrimSpace(trimmed))
case gotRaceHeader1:
if raceHeader == trimmed {
s.state = gotRaceHeader
// Send the line to the user.
return line, nil
}
s.state = normal
return line, nil
case gotRaceHeader:
if match := reRaceOperationHeader.FindStringSubmatch(trimmed); match != nil {
w := match[1] == "Write"
addr, err := strconv.ParseUint(match[2], 0, 64)
if err != nil {
return "", fmt.Errorf("failed to parse address on line: %q", strings.TrimSpace(trimmed))
}
id, err := strconv.Atoi(match[3])
if err != nil {
return "", fmt.Errorf("failed to parse goroutine id on line: %q", strings.TrimSpace(trimmed))
}
s.races = append(s.races, raceOp{w, addr, id})
s.state = gotRaceOperationHeader
return "", nil
}
s.state = normal
return line, nil
case gotRaceOperationHeader:
call, err := parseFunc(trimmed)
if call != nil {
// TODO(maruel): Figure out.
//cur.Stack.Calls = append(cur.Stack.Calls, *call)
s.state = gotRaceOperationFunc
return "", err
}
return "", fmt.Errorf("expected a function after a race operation, got: %q", trimmed)
case gotRaceGoroutineHeader:
call, err := parseFunc(strings.TrimLeft(trimmed, "\t "))
if call != nil {
cur.Stack.Calls = append(cur.Stack.Calls, *call)
s.state = gotRaceGoroutineFunc
return "", err
}
return "", fmt.Errorf("expected a function after a race operation, got: %q", trimmed)
case gotRaceOperationFunc:
if match := reFile.FindStringSubmatch(trimmed); match != nil {
_, err := strconv.Atoi(match[2])
if err != nil {
return "", fmt.Errorf("failed to parse int on line: %q", strings.TrimSpace(trimmed))
}
/* TODO(maruel): Figure out.
// cur.Stack.Calls is guaranteed to have at least one item.
i := len(cur.Stack.Calls) - 1
cur.Stack.Calls[i].SrcPath = match[1]
cur.Stack.Calls[i].Line = num
*/
s.state = gotRaceOperationFile
return "", nil
}
return "", fmt.Errorf("expected a file after a race function, got: %q", trimmed)
case gotRaceGoroutineFunc:
if match := reFile.FindStringSubmatch(trimmed); match != nil {
num, err := strconv.Atoi(match[2])
if err != nil {
return "", fmt.Errorf("failed to parse int on line: %q", strings.TrimSpace(trimmed))
}
// cur.Stack.Calls is guaranteed to have at least one item.
i := len(cur.Stack.Calls) - 1
cur.Stack.Calls[i].SrcPath = match[1]
cur.Stack.Calls[i].Line = num
s.state = gotRaceGoroutineFile
return "", nil
}
return "", fmt.Errorf("expected a file after a race function, got: %q", trimmed)
case gotRaceOperationFile:
if trimmed == "" {
s.state = betweenRaces
return "", nil
}
return "", fmt.Errorf("expected an empty line after a race file, got: %q", trimmed)
case gotRaceGoroutineFile:
if trimmed == "" {
s.state = betweenRaces
return "", nil
}
if trimmed == raceHeaderFooter {
// Done.
s.state = normal
return "", nil
}
call, err := parseFunc(strings.TrimLeft(trimmed, "\t "))
if call != nil {
// TODO(maruel): Process match.
s.state = gotRaceGoroutineFunc
return "", err
}
return "", fmt.Errorf("expected a function or the end after a race file, got: %q", trimmed)
case betweenRaces:
// Either Previous or Goroutine.
if match := reRacePreviousOperationHeader.FindStringSubmatch(trimmed); match != nil {
w := match[1] == "write"
addr, err := strconv.ParseUint(match[2], 0, 64)
if err != nil {
return "", fmt.Errorf("failed to parse address on line: %q", strings.TrimSpace(trimmed))
}
id, err := strconv.Atoi(match[3])
if err != nil {
return "", fmt.Errorf("failed to parse goroutine id on line: %q", strings.TrimSpace(trimmed))
}
s.races = append(s.races, raceOp{w, addr, id})
s.state = gotRaceOperationHeader
return "", nil
}
if match := reRaceGoroutine.FindStringSubmatch(trimmed); match != nil {
id, err := strconv.Atoi(match[1])
if err != nil {
return "", fmt.Errorf("failed to parse goroutine id on line: %q", strings.TrimSpace(trimmed))
}
g := &Goroutine{
Signature: Signature{State: match[2]},
ID: id,
First: len(s.goroutines) == 0,
}
s.goroutines = append(s.goroutines, g)
s.state = gotRaceGoroutineHeader
return "", nil
}
return "", fmt.Errorf("expected an operator or goroutine, got: %q", trimmed)
default:
return "", errors.New("internal error")
}
}
// parseFunc only return an error if also returning a Call.
func parseFunc(line string) (*Call, error) {
if match := reFunc.FindStringSubmatch(line); match != nil {
call := &Call{Func: Func{Raw: match[1]}}
for _, a := range strings.Split(match[2], ", ") {
if a == "..." {
call.Args.Elided = true
continue
}
if a == "" {
// Remaining values were dropped.
break
}
v, err := strconv.ParseUint(a, 0, 64)
if err != nil {
return call, fmt.Errorf("failed to parse int on line: %q", strings.TrimSpace(line))
}
call.Args.Values = append(call.Args.Values, Arg{Value: v})
}
return call, nil
}
return nil, nil
}
// hasPathPrefix returns true if any of s is the prefix of p.
func hasPathPrefix(p string, s map[string]string) bool {
for prefix := range s {
if strings.HasPrefix(p, prefix+"/") {
return true
}
}
return false
}
// getFiles returns all the source files deduped and ordered.
func getFiles(goroutines []*Goroutine) []string {
files := map[string]struct{}{}
for _, g := range goroutines {
for _, c := range g.Stack.Calls {
files[c.SrcPath] = struct{}{}
}
}
out := make([]string, 0, len(files))
for f := range files {
out = append(out, f)
}
sort.Strings(out)
return out
}
// splitPath splits a path into its components.
//
// The first item has its initial path separator kept.
func splitPath(p string) []string {
if p == "" {
return nil
}
var out []string
s := ""
for _, c := range p {
if c != '/' || (len(out) == 0 && strings.Count(s, "/") == len(s)) {
s += string(c)
} else if s != "" {
out = append(out, s)
s = ""
}
}
if s != "" {
out = append(out, s)
}
return out
}
// isFile returns true if the path is a valid file.
func isFile(p string) bool {
// TODO(maruel): Is it faster to open the file or to stat it? Worth a perf
// test on Windows.
i, err := os.Stat(p)
return err == nil && !i.IsDir()
}
// rootedIn returns a root if the file split in parts is rooted in root.
func rootedIn(root string, parts []string) string {
//log.Printf("rootIn(%s, %v)", root, parts)
for i := 1; i < len(parts); i++ {
suffix := filepath.Join(parts[i:]...)
if isFile(filepath.Join(root, suffix)) {
return filepath.Join(parts[:i]...)
}
}
return ""
}
// findRoots sets member GOROOT and GOPATHs.
func (c *Context) findRoots() {
c.GOPATHs = map[string]string{}
for _, f := range getFiles(c.Goroutines) {
// TODO(maruel): Could a stack dump have mixed cases? I think it's
// possible, need to confirm and handle.
//log.Printf(" Analyzing %s", f)
if c.GOROOT != "" && strings.HasPrefix(f, c.GOROOT+"/") {
continue
}
if hasPathPrefix(f, c.GOPATHs) {
continue
}
parts := splitPath(f)
if c.GOROOT == "" {
if r := rootedIn(c.localgoroot, parts); r != "" {
c.GOROOT = r
//log.Printf("Found GOROOT=%s", c.GOROOT)
continue
}
}
found := false
for _, l := range c.localgopaths {
if r := rootedIn(l, parts); r != "" {
//log.Printf("Found GOPATH=%s", r)
c.GOPATHs[r] = l
found = true
break
}
}
if !found {
// If the source is not found, just too bad.
//log.Printf("Failed to find locally: %s / %s", f, goroot)
}
}
}
func getGOPATHs() []string {
var out []string
for _, v := range filepath.SplitList(os.Getenv("GOPATH")) {
// Disallow non-absolute paths?
if v != "" {
out = append(out, v)
}
}
if len(out) == 0 {
homeDir := ""
u, err := user.Current()
if err != nil {
homeDir = os.Getenv("HOME")
if homeDir == "" {
panic(fmt.Sprintf("Could not get current user or $HOME: %s\n", err.Error()))
}
} else {
homeDir = u.HomeDir
}
out = []string{homeDir + "go"}
}
return out
}
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