mirror of
https://github.com/golang/go
synced 2024-09-05 16:04:50 +00:00
![Emmanuel Odeke](/assets/img/avatar_default.png)
Follows suit with https://go-review.googlesource.com/#/c/20111. Generated by running $ grep -R 'Go Authors. All' * | cut -d":" -f1 | while read F;do perl -pi -e 's/Go Authors. All/Go Authors. All/g' $F;done The code in cmd/internal/unvendor wasn't changed. Fixes #15213 Change-Id: I4f235cee0a62ec435f9e8540a1ec08ae03b1a75f Reviewed-on: https://go-review.googlesource.com/21819 Reviewed-by: Ian Lance Taylor <iant@golang.org> Run-TryBot: Ian Lance Taylor <iant@golang.org> TryBot-Result: Gobot Gobot <gobot@golang.org>
142 lines
2.5 KiB
Go
142 lines
2.5 KiB
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 of recover during recursive panics.
|
|
// Here be dragons.
|
|
|
|
package main
|
|
|
|
import "runtime"
|
|
|
|
func main() {
|
|
test1()
|
|
test2()
|
|
test3()
|
|
test4()
|
|
test5()
|
|
test6()
|
|
test7()
|
|
}
|
|
|
|
func die() {
|
|
runtime.Breakpoint() // can't depend on panic
|
|
}
|
|
|
|
func mustRecover(x interface{}) {
|
|
mustNotRecover() // because it's not a defer call
|
|
v := recover()
|
|
if v == nil {
|
|
println("missing recover")
|
|
die() // panic is useless here
|
|
}
|
|
if v != x {
|
|
println("wrong value", v, x)
|
|
die()
|
|
}
|
|
|
|
// the value should be gone now regardless
|
|
v = recover()
|
|
if v != nil {
|
|
println("recover didn't recover")
|
|
die()
|
|
}
|
|
}
|
|
|
|
func mustNotRecover() {
|
|
v := recover()
|
|
if v != nil {
|
|
println("spurious recover")
|
|
die()
|
|
}
|
|
}
|
|
|
|
func withoutRecover() {
|
|
mustNotRecover() // because it's a sub-call
|
|
}
|
|
|
|
func test1() {
|
|
// Easy nested recursive panic.
|
|
defer mustRecover(1)
|
|
defer func() {
|
|
defer mustRecover(2)
|
|
panic(2)
|
|
}()
|
|
panic(1)
|
|
}
|
|
|
|
func test2() {
|
|
// Sequential panic.
|
|
defer mustNotRecover()
|
|
defer func() {
|
|
v := recover()
|
|
if v == nil || v.(int) != 2 {
|
|
println("wrong value", v, 2)
|
|
die()
|
|
}
|
|
defer mustRecover(3)
|
|
panic(3)
|
|
}()
|
|
panic(2)
|
|
}
|
|
|
|
func test3() {
|
|
// Sequential panic - like test2 but less picky.
|
|
defer mustNotRecover()
|
|
defer func() {
|
|
recover()
|
|
defer mustRecover(3)
|
|
panic(3)
|
|
}()
|
|
panic(2)
|
|
}
|
|
|
|
func test4() {
|
|
// Single panic.
|
|
defer mustNotRecover()
|
|
defer func() {
|
|
recover()
|
|
}()
|
|
panic(4)
|
|
}
|
|
|
|
func test5() {
|
|
// Single panic but recover called via defer
|
|
defer mustNotRecover()
|
|
defer func() {
|
|
defer recover()
|
|
}()
|
|
panic(5)
|
|
}
|
|
|
|
func test6() {
|
|
// Sequential panic.
|
|
// Like test3, but changed recover to defer (same change as test4 → test5).
|
|
defer mustNotRecover()
|
|
defer func() {
|
|
defer recover() // like a normal call from this func; runs because mustRecover stops the panic
|
|
defer mustRecover(3)
|
|
panic(3)
|
|
}()
|
|
panic(2)
|
|
}
|
|
|
|
func test7() {
|
|
// Like test6, but swapped defer order.
|
|
// The recover in "defer recover()" is now a no-op,
|
|
// because it runs called from panic, not from the func,
|
|
// and therefore cannot see the panic of 2.
|
|
// (Alternately, it cannot see the panic of 2 because
|
|
// there is an active panic of 3. And it cannot see the
|
|
// panic of 3 because it is at the wrong level (too high on the stack).)
|
|
defer mustRecover(2)
|
|
defer func() {
|
|
defer mustRecover(3)
|
|
defer recover() // now a no-op, unlike in test6.
|
|
panic(3)
|
|
}()
|
|
panic(2)
|
|
}
|