mirror of
https://github.com/golang/go
synced 2024-11-11 18:31:38 -07:00
test for panic and recover
R=r, adg CC=golang-dev https://golang.org/cl/869041
This commit is contained in:
Russ Cox
parent
9b1507b050
commit
b6ad074efc
246
test/recover.go
Normal file
246
test/recover.go
Normal file
@ -0,0 +1,246 @@
|
||||
// $G $D/$F.go && $L $F.$A && ./$A.out
|
||||
|
||||
// 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 basic recover functionality.
|
||||
|
||||
package main
|
||||
|
||||
import "runtime"
|
||||
|
||||
func main() {
|
||||
test1()
|
||||
test1WithClosures()
|
||||
test2()
|
||||
test3()
|
||||
test4()
|
||||
test5()
|
||||
test6()
|
||||
test6WithClosures()
|
||||
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() {
|
||||
defer mustNotRecover() // because mustRecover will squelch it
|
||||
defer mustRecover(1) // because of panic below
|
||||
defer withoutRecover() // should be no-op, leaving for mustRecover to find
|
||||
panic(1)
|
||||
}
|
||||
|
||||
// Repeat test1 with closures instead of standard function.
|
||||
// Interesting because recover bases its decision
|
||||
// on the frame pointer of its caller, and a closure's
|
||||
// frame pointer is in the middle of its actual arguments
|
||||
// (after the hidden ones for the closed-over variables).
|
||||
func test1WithClosures() {
|
||||
defer func() {
|
||||
v := recover()
|
||||
if v != nil {
|
||||
println("spurious recover in closure")
|
||||
die()
|
||||
}
|
||||
}()
|
||||
defer func(x interface{}) {
|
||||
mustNotRecover()
|
||||
v := recover()
|
||||
if v == nil {
|
||||
println("missing recover")
|
||||
die()
|
||||
}
|
||||
if v != x {
|
||||
println("wrong value", v, x)
|
||||
die()
|
||||
}
|
||||
}(1)
|
||||
defer func() {
|
||||
mustNotRecover()
|
||||
}()
|
||||
panic(1)
|
||||
}
|
||||
|
||||
func test2() {
|
||||
// Recover only sees the panic argument
|
||||
// if it is called from a deferred call.
|
||||
// It does not see the panic when called from a call within a deferred call (too late)
|
||||
// nor does it see the panic when it *is* the deferred call (too early).
|
||||
defer mustRecover(2)
|
||||
defer recover() // should be no-op
|
||||
panic(2)
|
||||
}
|
||||
|
||||
func test3() {
|
||||
defer mustNotRecover()
|
||||
defer func() {
|
||||
recover() // should squelch
|
||||
}()
|
||||
panic(3)
|
||||
}
|
||||
|
||||
func test4() {
|
||||
// Equivalent to test3 but using defer to make the call.
|
||||
defer mustNotRecover()
|
||||
defer func() {
|
||||
defer recover() // should squelch
|
||||
}()
|
||||
panic(4)
|
||||
}
|
||||
|
||||
// Check that closures can set output arguments.
|
||||
// Run g(). If it panics, return x; else return deflt.
|
||||
func try(g func(), deflt interface{}) (x interface{}) {
|
||||
defer func() {
|
||||
if v := recover(); v != nil {
|
||||
x = v
|
||||
}
|
||||
}()
|
||||
defer g()
|
||||
return deflt
|
||||
}
|
||||
|
||||
// Check that closures can set output arguments.
|
||||
// Run g(). If it panics, return x; else return deflt.
|
||||
func try1(g func(), deflt interface{}) (x interface{}) {
|
||||
defer func() {
|
||||
if v := recover(); v != nil {
|
||||
x = v
|
||||
}
|
||||
}()
|
||||
defer g()
|
||||
x = deflt
|
||||
return
|
||||
}
|
||||
|
||||
func test5() {
|
||||
v := try(func() { panic(5) }, 55).(int)
|
||||
if v != 5 {
|
||||
println("wrong value", v, 5)
|
||||
die()
|
||||
}
|
||||
|
||||
s := try(func() { }, "hi").(string)
|
||||
if s != "hi" {
|
||||
println("wrong value", s, "hi")
|
||||
die()
|
||||
}
|
||||
|
||||
v = try1(func() { panic(5) }, 55).(int)
|
||||
if v != 5 {
|
||||
println("try1 wrong value", v, 5)
|
||||
die()
|
||||
}
|
||||
|
||||
s = try1(func() { }, "hi").(string)
|
||||
if s != "hi" {
|
||||
println("try1 wrong value", s, "hi")
|
||||
die()
|
||||
}
|
||||
}
|
||||
|
||||
// When a deferred big call starts, it must first
|
||||
// create yet another stack segment to hold the
|
||||
// giant frame for x. Make sure that doesn't
|
||||
// confuse recover.
|
||||
func big(mustRecover bool) {
|
||||
var x [100000]int
|
||||
x[0] = 1
|
||||
x[99999] = 1
|
||||
_ = x
|
||||
|
||||
v := recover()
|
||||
if mustRecover {
|
||||
if v == nil {
|
||||
println("missing big recover")
|
||||
die()
|
||||
}
|
||||
} else {
|
||||
if v != nil {
|
||||
println("spurious big recover")
|
||||
die()
|
||||
}
|
||||
}
|
||||
}
|
||||
|
||||
func test6() {
|
||||
defer big(false)
|
||||
defer big(true)
|
||||
panic(6)
|
||||
}
|
||||
|
||||
func test6WithClosures() {
|
||||
defer func() {
|
||||
var x [100000]int
|
||||
x[0] = 1
|
||||
x[99999] = 1
|
||||
_ = x
|
||||
if recover() != nil {
|
||||
println("spurious big closure recover")
|
||||
die()
|
||||
}
|
||||
}()
|
||||
defer func() {
|
||||
var x [100000]int
|
||||
x[0] = 1
|
||||
x[99999] = 1
|
||||
_ = x
|
||||
if recover() == nil {
|
||||
println("missing big closure recover")
|
||||
die()
|
||||
}
|
||||
}()
|
||||
panic("6WithClosures")
|
||||
}
|
||||
|
||||
func test7() {
|
||||
ok := false
|
||||
func() {
|
||||
// should panic, then call mustRecover 7, which stops the panic.
|
||||
// then should keep processing ordinary defers earlier than that one
|
||||
// before returning.
|
||||
// this test checks that the defer func on the next line actually runs.
|
||||
defer func() { ok = true }()
|
||||
defer mustRecover(7)
|
||||
panic(7)
|
||||
}()
|
||||
if !ok {
|
||||
println("did not run ok func")
|
||||
die()
|
||||
}
|
||||
}
|
||||
141
test/recover1.go
Normal file
141
test/recover1.go
Normal file
@ -0,0 +1,141 @@
|
||||
// $G $D/$F.go && $L $F.$A && ./$A.out
|
||||
|
||||
// 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)
|
||||
}
|
||||
Loading…
Reference in New Issue
Block a user