go recover3 源码
golang recover3 代码
文件路径：/test/recover3.go
// run
// Copyright 2010 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.
// Test recovering from runtime errors.
package main
import (
"runtime"
"strings"
)
var didbug bool
func bug() {
if didbug {
return
}
println("BUG")
didbug = true
}
func check(name string, f func(), err string) {
defer func() {
v := recover()
if v == nil {
bug()
println(name, "did not panic")
return
}
runt, ok := v.(runtime.Error)
if !ok {
bug()
println(name, "panicked but not with runtime.Error")
return
}
s := runt.Error()
if strings.Index(s, err) < 0 {
bug()
println(name, "panicked with", s, "not", err)
return
}
}()
f()
}
func main() {
var x int
var x64 int64
var p *[10]int
var q *[10000]int
var i int
check("int-div-zero", func() { println(1 / x) }, "integer divide by zero")
check("int64-div-zero", func() { println(1 / x64) }, "integer divide by zero")
check("nil-deref", func() { println(p[0]) }, "nil pointer dereference")
check("nil-deref-1", func() { println(p[1]) }, "nil pointer dereference")
check("nil-deref-big", func() { println(q[5000]) }, "nil pointer dereference")
i = 99999
var sl []int
p1 := new([10]int)
check("array-bounds", func() { println(p1[i]) }, "index out of range")
check("slice-bounds", func() { println(sl[i]) }, "index out of range")
var inter interface{}
inter = 1
check("type-concrete", func() { println(inter.(string)) }, "int, not string")
check("type-interface", func() { println(inter.(m)) }, "missing method m")
if didbug {
panic("recover3")
}
}
type m interface {
m()
}
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