153 lines
2.7 KiB
Go
153 lines
2.7 KiB
Go
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// Copyright 2017 Marc-Antoine Ruel. All rights reserved.
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// Use of this source code is governed under the Apache License, Version 2.0
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// that can be found in the LICENSE file.
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// Panic crashes in various ways.
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//
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// It is a tool to help test panicparse.
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package main
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// To install, run:
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// go install github.com/maruel/panicparse/internal/panic
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// panic -help
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//
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// You can also run directly:
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// go run ./internal/panic/main.go str |& pp
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//
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// To add a new panic stack signature, add it to types type below, keeping the
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// list ordered by name. If you need utility functions, add it in the section
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// below. That's it!
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import (
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"fmt"
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"io"
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"os"
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"sort"
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"sync"
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"time"
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)
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// Utility functions.
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func panicint(i int) {
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panic(i)
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}
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func panicstr(a string) {
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panic(a)
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}
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func panicslicestr(a []string) {
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panic(a)
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}
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//
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// types is all the supported types of panics.
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//
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// Keep the list sorted.
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var types = map[string]struct {
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desc string
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f func()
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}{
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"goroutine_1": {
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"panic in one goroutine",
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func() {
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go func() {
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panicint(42)
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}()
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time.Sleep(time.Minute)
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},
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},
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"goroutine_100": {
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"start 100 goroutines before panicking",
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func() {
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var wg sync.WaitGroup
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for i := 0; i < 100; i++ {
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wg.Add(1)
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go func() {
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wg.Done()
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time.Sleep(time.Minute)
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}()
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}
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wg.Wait()
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panicint(42)
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},
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},
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"int": {
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"panic(42)",
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func() {
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panicint(42)
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},
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},
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"simple": {
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// This is not used for real, here for documentation.
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"skip the map for a shorter stack trace",
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func() {},
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},
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"slice_str": {
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"panic([]string{\"allo\"}) with cap=2",
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func() {
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a := make([]string, 1, 2)
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a[0] = "allo"
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panicslicestr(a)
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},
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},
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"str": {
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"panic(\"allo\")",
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func() {
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panicstr("allo")
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},
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},
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}
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//
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func main() {
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fmt.Printf("GOTRACEBACK=%s\n", os.Getenv("GOTRACEBACK"))
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if len(os.Args) == 2 {
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n := os.Args[1]
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if n == "simple" {
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// Since the map lookup creates another call stack entry, add a one-off
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// "simple" to test the very minimal case.
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panic("simple")
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}
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if f, ok := types[n]; ok {
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f.f()
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}
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}
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usage()
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}
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func usage() {
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t := `usage: panic <way>
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This tool is meant to be used with panicparse to test different parsing
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scenarios and ensure output on different version of the Go toolchain can be
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successfully parsed.
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Set GOTRACEBACK before running this tool to see how it affects the panic output.
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Select the way to panic:
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`
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io.WriteString(os.Stderr, t)
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names := make([]string, 0, len(types))
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m := 0
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for n := range types {
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names = append(names, n)
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if i := len(n); i > m {
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m = i
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}
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}
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sort.Strings(names)
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for _, n := range names {
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fmt.Fprintf(os.Stderr, "- %-*s %s\n", m, n, types[n].desc)
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}
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os.Exit(2)
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}
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