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// run
//go:build !nacl && !js && !wasip1 && !gccgo
// Copyright 2017 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.
// ensure that panic(x) where x is a numeric type displays a readable number
package main
import (
"bytes"
"fmt"
"io/ioutil"
"log"
"os"
"os/exec"
"path/filepath"
)
const fn = `
package main
import "errors"
type S struct {
}
func (s S) String() string {
return "s-stringer"
}
func main() {
_ = errors.New
panic(%s(%s))
}
`
func main() {
tempDir, err := ioutil.TempDir("", "")
if err != nil {
log.Fatal(err)
}
defer os.RemoveAll(tempDir)
tmpFile := filepath.Join(tempDir, "tmp.go")
for _, tc := range []struct {
Type string
Input string
Expect string
}{
{"", "nil", "panic: panic called with nil argument"},
{"errors.New", `"test"`, "panic: test"},
{"S", "S{}", "panic: s-stringer"},
{"byte", "8", "panic: 8"},
{"rune", "8", "panic: 8"},
{"int", "8", "panic: 8"},
{"int8", "8", "panic: 8"},
{"int16", "8", "panic: 8"},
{"int32", "8", "panic: 8"},
{"int64", "8", "panic: 8"},
{"uint", "8", "panic: 8"},
{"uint8", "8", "panic: 8"},
{"uint16", "8", "panic: 8"},
{"uint32", "8", "panic: 8"},
{"uint64", "8", "panic: 8"},
{"uintptr", "8", "panic: 8"},
{"bool", "true", "panic: true"},
{"complex64", "8 + 16i", "panic: (+8.000000e+000+1.600000e+001i)"},
{"complex128", "8+16i", "panic: (+8.000000e+000+1.600000e+001i)"},
{"string", `"test"`, "panic: test"}} {
b := bytes.Buffer{}
fmt.Fprintf(&b, fn, tc.Type, tc.Input)
err = ioutil.WriteFile(tmpFile, b.Bytes(), 0644)
if err != nil {
log.Fatal(err)
}
cmd := exec.Command("go", "run", tmpFile)
var buf bytes.Buffer
cmd.Stdout = &buf
cmd.Stderr = &buf
cmd.Env = os.Environ()
cmd.Run() // ignore err as we expect a panic
out := buf.Bytes()
panicIdx := bytes.Index(out, []byte("panic: "))
if panicIdx == -1 {
log.Fatalf("expected a panic in output for %s, got: %s", tc.Type, out)
}
eolIdx := bytes.IndexByte(out[panicIdx:], '\n') + panicIdx
if panicIdx == -1 {
log.Fatalf("expected a newline in output for %s after the panic, got: %s", tc.Type, out)
}
out = out[0:eolIdx]
if string(out) != tc.Expect {
log.Fatalf("expected '%s' for panic(%s(%s)), got %s", tc.Expect, tc.Type, tc.Input, out)
}
}
}