mirror of
https://github.com/golang/go
synced 2024-11-08 19:06:26 -07:00
e3c684777a
The general policy for the current state of js/wasm is that it only has to support tests that are also supported by nacl. The test nilptr3.go makes assumptions about which nil checks can be removed. Since WebAssembly does not signal on reading a null pointer, all nil checks have to be explicit. Updates #18892 Change-Id: I06a687860b8d22ae26b1c391499c0f5183e4c485 Reviewed-on: https://go-review.googlesource.com/110096 Reviewed-by: Brad Fitzpatrick <bradfitz@golang.org> Run-TryBot: Brad Fitzpatrick <bradfitz@golang.org> TryBot-Result: Gobot Gobot <gobot@golang.org>
96 lines
1.9 KiB
Go
96 lines
1.9 KiB
Go
// +build !nacl,!js,disabled_see_issue_18589
|
|
// buildrun -t 10 -gcflags=-d=ssa/insert_resched_checks/on,ssa/check/on
|
|
|
|
// Copyright 2016 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 is disabled because it flakes when run in all.bash
|
|
// on some platforms, but is useful standalone to verify
|
|
// that rescheduling checks are working (and we may wish
|
|
// to investigate the flake, since it suggests that the
|
|
// loop rescheduling check may not work right on those
|
|
// platforms).
|
|
|
|
// This checks to see that call-free infinite loops do not
|
|
// block garbage collection. IF YOU RUN IT STANDALONE without
|
|
// -gcflags=-d=ssa/insert_resched_checks/on in a not-experimental
|
|
// build, it should hang.
|
|
|
|
package main
|
|
|
|
import (
|
|
"runtime"
|
|
)
|
|
|
|
var someglobal1 int
|
|
var someglobal2 int
|
|
var someglobal3 int
|
|
|
|
//go:noinline
|
|
func f() {}
|
|
|
|
func standinacorner1() {
|
|
for someglobal1&1 == 0 {
|
|
someglobal1++
|
|
someglobal1++
|
|
}
|
|
}
|
|
|
|
func standinacorner2(i int) {
|
|
// contains an irreducible loop containing changes to memory
|
|
if i != 0 {
|
|
goto midloop
|
|
}
|
|
|
|
loop:
|
|
if someglobal2&1 != 0 {
|
|
goto done
|
|
}
|
|
someglobal2++
|
|
midloop:
|
|
someglobal2++
|
|
goto loop
|
|
|
|
done:
|
|
return
|
|
}
|
|
|
|
func standinacorner3() {
|
|
for someglobal3&1 == 0 {
|
|
if someglobal3&2 != 0 {
|
|
for someglobal3&3 == 2 {
|
|
someglobal3++
|
|
someglobal3++
|
|
someglobal3++
|
|
someglobal3++
|
|
}
|
|
}
|
|
someglobal3++
|
|
someglobal3++
|
|
someglobal3++
|
|
someglobal3++
|
|
}
|
|
}
|
|
|
|
func main() {
|
|
go standinacorner1()
|
|
go standinacorner2(0)
|
|
go standinacorner3()
|
|
// println("About to stand in a corner1")
|
|
for someglobal1 == 0 {
|
|
runtime.Gosched()
|
|
}
|
|
// println("About to stand in a corner2")
|
|
for someglobal2 == 0 {
|
|
runtime.Gosched()
|
|
}
|
|
// println("About to stand in a corner3")
|
|
for someglobal3 == 0 {
|
|
runtime.Gosched()
|
|
}
|
|
// println("About to GC")
|
|
runtime.GC()
|
|
// println("Success")
|
|
}
|