diff options
Diffstat (limited to 'test/recover.go')
-rw-r--r-- | test/recover.go | 92 |
1 files changed, 87 insertions, 5 deletions
diff --git a/test/recover.go b/test/recover.go index 071be6667..f92c15c1d 100644 --- a/test/recover.go +++ b/test/recover.go @@ -47,6 +47,7 @@ func main() { test11reflect1() test11reflect2() } + test111() test12() if !interp { test12reflect1() @@ -62,6 +63,7 @@ func main() { test14reflect1() test14reflect2() test15() + test16() } } @@ -77,7 +79,7 @@ func mustRecoverBody(v1, v2, v3, x interface{}) { } v = v2 if v == nil { - println("missing recover") + println("missing recover", x.(int)) die() // panic is useless here } if v != x { @@ -113,10 +115,23 @@ func withoutRecover() { mustNotRecover() // because it's a sub-call } +func withoutRecoverRecursive(n int) { + if n == 0 { + withoutRecoverRecursive(1) + } else { + v := recover() + if v != nil { + println("spurious recover (recursive)", v) + die() + } + } +} + 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 + 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 + defer withoutRecoverRecursive(0) // ditto panic(1) } @@ -137,7 +152,7 @@ func test1WithClosures() { mustNotRecover() v := recover() if v == nil { - println("missing recover") + println("missing recover", x.(int)) die() } if v != x { @@ -406,6 +421,49 @@ func test11reflect2() { panic(11) } +// tiny receiver, so basic wrapper in i.M() +type T3deeper struct{} + +func (T3deeper) M() { + badstate() // difference from T3 + mustRecoverBody(doubleRecover(), recover(), recover(), 111) +} + +func test111() { + var i I = T3deeper{} + defer i.M() + panic(111) +} + +type Tiny struct{} + +func (Tiny) M() { + panic(112) +} + +// i.M is a wrapper, and i.M panics. +// +// This is a torture test for an old implementation of recover that +// tried to deal with wrapper functions by doing some argument +// positioning math on both entry and exit. Doing anything on exit +// is a problem because sometimes functions exit via panic instead +// of an ordinary return, so panic would have to know to do the +// same math when unwinding the stack. It gets complicated fast. +// This particular test never worked with the old scheme, because +// panic never did the right unwinding math. +// +// The new scheme adjusts Panic.argp on entry to a wrapper. +// It has no exit work, so if a wrapper is interrupted by a panic, +// there's no cleanup that panic itself must do. +// This test just works now. +func badstate() { + defer func() { + recover() + }() + var i I = Tiny{} + i.M() +} + // large receiver, so basic wrapper in i.M() type T4 [2]string @@ -503,3 +561,27 @@ func test15() { defer f() panic(15) } + +func reflectFunc2(args []reflect.Value) (results []reflect.Value) { + // This will call reflectFunc3 + args[0].Interface().(func())() + return nil +} + +func reflectFunc3(args []reflect.Value) (results []reflect.Value) { + if v := recover(); v != nil { + println("spurious recover", v) + die() + } + return nil +} + +func test16() { + defer mustRecover(16) + + f2 := reflect.MakeFunc(reflect.TypeOf((func(func()))(nil)), reflectFunc2).Interface().(func(func())) + f3 := reflect.MakeFunc(reflect.TypeOf((func())(nil)), reflectFunc3).Interface().(func()) + defer f2(f3) + + panic(16) +} |