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