mirror of
https://github.com/golang/go
synced 2024-11-23 18:50:05 -07:00
3ddf5a655e
R=gri CC=golang-dev https://golang.org/cl/13471045
506 lines
8.7 KiB
Go
506 lines
8.7 KiB
Go
// run
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// Copyright 2010 The Go Authors. All rights reserved.
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// Use of this source code is governed by a BSD-style
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// license that can be found in the LICENSE file.
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// Test of basic recover functionality.
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package main
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import (
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"os"
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"reflect"
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"runtime"
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)
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func main() {
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// go.tools/ssa/interp still has:
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// - some lesser bugs in recover()
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// - incomplete support for reflection
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interp := os.Getenv("GOSSAINTERP") != ""
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test1()
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test1WithClosures()
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test2()
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test3()
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if !interp {
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test4()
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}
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test5()
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test6()
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test6WithClosures()
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test7()
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test8()
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test9()
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if !interp {
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test9reflect1()
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test9reflect2()
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}
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test10()
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if !interp {
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test10reflect1()
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test10reflect2()
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}
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test11()
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if !interp {
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test11reflect1()
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test11reflect2()
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}
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test12()
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if !interp {
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test12reflect1()
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test12reflect2()
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}
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test13()
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if !interp {
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test13reflect1()
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test13reflect2()
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}
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test14()
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if !interp {
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test14reflect1()
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test14reflect2()
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test15()
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}
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}
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func die() {
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runtime.Breakpoint() // can't depend on panic
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}
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func mustRecoverBody(v1, v2, v3, x interface{}) {
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v := v1
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if v != nil {
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println("spurious recover", v)
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die()
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}
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v = v2
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if v == nil {
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println("missing recover")
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die() // panic is useless here
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}
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if v != x {
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println("wrong value", v, x)
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die()
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}
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// the value should be gone now regardless
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v = v3
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if v != nil {
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println("recover didn't recover")
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die()
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}
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}
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func doubleRecover() interface{} {
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return recover()
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}
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func mustRecover(x interface{}) {
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mustRecoverBody(doubleRecover(), recover(), recover(), x)
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}
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func mustNotRecover() {
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v := recover()
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if v != nil {
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println("spurious recover", v)
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die()
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}
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}
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func withoutRecover() {
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mustNotRecover() // because it's a sub-call
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}
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func test1() {
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defer mustNotRecover() // because mustRecover will squelch it
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defer mustRecover(1) // because of panic below
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defer withoutRecover() // should be no-op, leaving for mustRecover to find
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panic(1)
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}
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// Repeat test1 with closures instead of standard function.
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// Interesting because recover bases its decision
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// on the frame pointer of its caller, and a closure's
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// frame pointer is in the middle of its actual arguments
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// (after the hidden ones for the closed-over variables).
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func test1WithClosures() {
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defer func() {
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v := recover()
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if v != nil {
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println("spurious recover in closure")
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die()
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}
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}()
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defer func(x interface{}) {
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mustNotRecover()
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v := recover()
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if v == nil {
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println("missing recover")
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die()
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}
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if v != x {
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println("wrong value", v, x)
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die()
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}
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}(1)
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defer func() {
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mustNotRecover()
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}()
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panic(1)
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}
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func test2() {
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// Recover only sees the panic argument
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// if it is called from a deferred call.
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// It does not see the panic when called from a call within a deferred call (too late)
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// nor does it see the panic when it *is* the deferred call (too early).
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defer mustRecover(2)
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defer recover() // should be no-op
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panic(2)
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}
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func test3() {
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defer mustNotRecover()
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defer func() {
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recover() // should squelch
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}()
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panic(3)
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}
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func test4() {
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// Equivalent to test3 but using defer to make the call.
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defer mustNotRecover()
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defer func() {
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defer recover() // should squelch
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}()
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panic(4)
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}
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// Check that closures can set output arguments.
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// Run g(). If it panics, return x; else return deflt.
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func try(g func(), deflt interface{}) (x interface{}) {
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defer func() {
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if v := recover(); v != nil {
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x = v
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}
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}()
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defer g()
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return deflt
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}
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// Check that closures can set output arguments.
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// Run g(). If it panics, return x; else return deflt.
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func try1(g func(), deflt interface{}) (x interface{}) {
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defer func() {
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if v := recover(); v != nil {
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x = v
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}
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}()
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defer g()
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x = deflt
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return
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}
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func test5() {
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v := try(func() { panic(5) }, 55).(int)
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if v != 5 {
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println("wrong value", v, 5)
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die()
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}
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s := try(func() {}, "hi").(string)
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if s != "hi" {
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println("wrong value", s, "hi")
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die()
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}
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v = try1(func() { panic(5) }, 55).(int)
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if v != 5 {
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println("try1 wrong value", v, 5)
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die()
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}
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s = try1(func() {}, "hi").(string)
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if s != "hi" {
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println("try1 wrong value", s, "hi")
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die()
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}
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}
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// When a deferred big call starts, it must first
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// create yet another stack segment to hold the
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// giant frame for x. Make sure that doesn't
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// confuse recover.
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func big(mustRecover bool) {
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var x [100000]int
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x[0] = 1
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x[99999] = 1
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_ = x
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v := recover()
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if mustRecover {
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if v == nil {
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println("missing big recover")
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die()
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}
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} else {
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if v != nil {
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println("spurious big recover")
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die()
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}
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}
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}
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func test6() {
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defer big(false)
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defer big(true)
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panic(6)
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}
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func test6WithClosures() {
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defer func() {
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var x [100000]int
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x[0] = 1
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x[99999] = 1
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_ = x
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if recover() != nil {
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println("spurious big closure recover")
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die()
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}
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}()
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defer func() {
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var x [100000]int
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x[0] = 1
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x[99999] = 1
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_ = x
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if recover() == nil {
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println("missing big closure recover")
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die()
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}
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}()
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panic("6WithClosures")
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}
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func test7() {
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ok := false
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func() {
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// should panic, then call mustRecover 7, which stops the panic.
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// then should keep processing ordinary defers earlier than that one
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// before returning.
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// this test checks that the defer func on the next line actually runs.
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defer func() { ok = true }()
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defer mustRecover(7)
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panic(7)
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}()
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if !ok {
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println("did not run ok func")
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die()
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}
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}
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func varargs(s *int, a ...int) {
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*s = 0
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for _, v := range a {
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*s += v
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}
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if recover() != nil {
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*s += 100
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}
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}
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func test8a() (r int) {
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defer varargs(&r, 1, 2, 3)
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panic(0)
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}
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func test8b() (r int) {
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defer varargs(&r, 4, 5, 6)
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return
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}
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func test8() {
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if test8a() != 106 || test8b() != 15 {
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println("wrong value")
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die()
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}
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}
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type I interface {
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M()
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}
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// pointer receiver, so no wrapper in i.M()
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type T1 struct{}
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func (*T1) M() {
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mustRecoverBody(doubleRecover(), recover(), recover(), 9)
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}
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func test9() {
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var i I = &T1{}
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defer i.M()
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panic(9)
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}
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func test9reflect1() {
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f := reflect.ValueOf(&T1{}).Method(0).Interface().(func())
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defer f()
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panic(9)
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}
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func test9reflect2() {
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f := reflect.TypeOf(&T1{}).Method(0).Func.Interface().(func(*T1))
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defer f(&T1{})
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panic(9)
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}
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// word-sized value receiver, so no wrapper in i.M()
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type T2 uintptr
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func (T2) M() {
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mustRecoverBody(doubleRecover(), recover(), recover(), 10)
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}
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func test10() {
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var i I = T2(0)
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defer i.M()
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panic(10)
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}
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func test10reflect1() {
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f := reflect.ValueOf(T2(0)).Method(0).Interface().(func())
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defer f()
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panic(10)
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}
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func test10reflect2() {
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f := reflect.TypeOf(T2(0)).Method(0).Func.Interface().(func(T2))
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defer f(T2(0))
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panic(10)
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}
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// tiny receiver, so basic wrapper in i.M()
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type T3 struct{}
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func (T3) M() {
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mustRecoverBody(doubleRecover(), recover(), recover(), 11)
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}
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func test11() {
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var i I = T3{}
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defer i.M()
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panic(11)
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}
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func test11reflect1() {
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f := reflect.ValueOf(T3{}).Method(0).Interface().(func())
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defer f()
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panic(11)
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}
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func test11reflect2() {
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f := reflect.TypeOf(T3{}).Method(0).Func.Interface().(func(T3))
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defer f(T3{})
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panic(11)
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}
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// large receiver, so basic wrapper in i.M()
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type T4 [2]string
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func (T4) M() {
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mustRecoverBody(doubleRecover(), recover(), recover(), 12)
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}
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func test12() {
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var i I = T4{}
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defer i.M()
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panic(12)
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}
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func test12reflect1() {
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f := reflect.ValueOf(T4{}).Method(0).Interface().(func())
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defer f()
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panic(12)
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}
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func test12reflect2() {
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f := reflect.TypeOf(T4{}).Method(0).Func.Interface().(func(T4))
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defer f(T4{})
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panic(12)
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}
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// enormous receiver, so wrapper splits stack to call M
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type T5 [8192]byte
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func (T5) M() {
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mustRecoverBody(doubleRecover(), recover(), recover(), 13)
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}
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func test13() {
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var i I = T5{}
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defer i.M()
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panic(13)
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}
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func test13reflect1() {
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f := reflect.ValueOf(T5{}).Method(0).Interface().(func())
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defer f()
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panic(13)
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}
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func test13reflect2() {
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f := reflect.TypeOf(T5{}).Method(0).Func.Interface().(func(T5))
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defer f(T5{})
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panic(13)
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}
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// enormous receiver + enormous method frame, so wrapper splits stack to call M,
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// and then M splits stack to allocate its frame.
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// recover must look back two frames to find the panic.
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type T6 [8192]byte
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var global byte
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func (T6) M() {
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var x [8192]byte
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x[0] = 1
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x[1] = 2
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for i := range x {
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global += x[i]
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}
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mustRecoverBody(doubleRecover(), recover(), recover(), 14)
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}
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func test14() {
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var i I = T6{}
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defer i.M()
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panic(14)
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}
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func test14reflect1() {
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f := reflect.ValueOf(T6{}).Method(0).Interface().(func())
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defer f()
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panic(14)
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}
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func test14reflect2() {
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f := reflect.TypeOf(T6{}).Method(0).Func.Interface().(func(T6))
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defer f(T6{})
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panic(14)
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}
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// function created by reflect.MakeFunc
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func reflectFunc(args []reflect.Value) (results []reflect.Value) {
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mustRecoverBody(doubleRecover(), recover(), recover(), 15)
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return nil
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}
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func test15() {
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f := reflect.MakeFunc(reflect.TypeOf((func())(nil)), reflectFunc).Interface().(func())
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defer f()
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panic(15)
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}
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