mirror of
https://github.com/golang/go
synced 2024-11-14 06:20:23 -07:00
43 lines
879 B
Go
43 lines
879 B
Go
|
// run
|
||
|
|
|
||
|
|
// Copyright 2018 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.
|
||
|
|
|
||
|
|
// Verify that we don't consider a Go'd function's
|
||
|
|
// arguments as pointers when they aren't.
|
||
|
|
|
||
|
|
package main
|
||
|
|
|
||
|
|
import (
|
||
|
|
"unsafe"
|
||
|
|
)
|
||
|
|
|
||
|
|
var badPtr uintptr
|
||
|
|
|
||
|
|
var sink []byte
|
||
|
|
|
||
|
|
func init() {
|
||
|
|
// Allocate large enough to use largeAlloc.
|
||
|
|
b := make([]byte, 1<<16-1)
|
||
|
|
sink = b // force heap allocation
|
||
|
|
// Any space between the object and the end of page is invalid to point to.
|
||
|
|
badPtr = uintptr(unsafe.Pointer(&b[len(b)-1])) + 1
|
||
|
|
}
|
||
|
|
|
||
|
|
var throttle = make(chan struct{}, 10)
|
||
|
|
|
||
|
|
func noPointerArgs(a, b, c, d uintptr) {
|
||
|
|
sink = make([]byte, 4096)
|
||
|
|
<-throttle
|
||
|
|
}
|
||
|
|
|
||
|
|
func main() {
|
||
|
|
const N = 1000
|
||
|
|
for i := 0; i < N; i++ {
|
||
|
|
throttle <- struct{}{}
|
||
|
|
go noPointerArgs(badPtr, badPtr, badPtr, badPtr)
|
||
|
|
sink = make([]byte, 4096)
|
||
|
|
}
|
||
|
|
}
|