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// run
// Copyright 2019 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 that //go:uintptrescapes works for methods.
package main
import (
"fmt"
"runtime"
"unsafe"
)
var callback func()
//go:noinline
//go:uintptrescapes
func F(ptr uintptr) { callback() }
//go:noinline
//go:uintptrescapes
func Fv(ptrs ...uintptr) { callback() }
type T struct{}
//go:noinline
//go:uintptrescapes
func (T) M(ptr uintptr) { callback() }
//go:noinline
//go:uintptrescapes
func (T) Mv(ptrs ...uintptr) { callback() }
// Each test should pass uintptr(ptr) as an argument to a function call,
// which in turn should call callback. The callback checks that ptr is kept alive.
var tests = []func(ptr unsafe.Pointer){
func(ptr unsafe.Pointer) { F(uintptr(ptr)) },
func(ptr unsafe.Pointer) { Fv(uintptr(ptr)) },
func(ptr unsafe.Pointer) { T{}.M(uintptr(ptr)) },
func(ptr unsafe.Pointer) { T{}.Mv(uintptr(ptr)) },
}
func main() {
for i, test := range tests {
finalized := false
ptr := new([64]byte)
runtime.SetFinalizer(ptr, func(*[64]byte) {
finalized = true
})
callback = func() {
runtime.GC()
if finalized {
fmt.Printf("test #%d failed\n", i)
}
}
test(unsafe.Pointer(ptr))
}
}
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