1// run 2 3// Copyright 2018 The Go Authors. All rights reserved. 4// Use of this source code is governed by a BSD-style 5// license that can be found in the LICENSE file. 6 7// Verify that we don't consider a Go'd function's 8// arguments as pointers when they aren't. 9 10package main 11 12import ( 13 "unsafe" 14) 15 16var badPtr uintptr 17 18var sink []byte 19 20func init() { 21 // Allocate large enough to use largeAlloc. 22 b := make([]byte, 1<<16-1) 23 sink = b // force heap allocation 24 // Any space between the object and the end of page is invalid to point to. 25 badPtr = uintptr(unsafe.Pointer(&b[len(b)-1])) + 1 26} 27 28var throttle = make(chan struct{}, 10) 29 30func noPointerArgs(a, b, c, d uintptr) { 31 sink = make([]byte, 4096) 32 <-throttle 33} 34 35func main() { 36 const N = 1000 37 for i := 0; i < N; i++ { 38 throttle <- struct{}{} 39 go noPointerArgs(badPtr, badPtr, badPtr, badPtr) 40 sink = make([]byte, 4096) 41 } 42} 43