Initial commit: Go 1.23 release state

test/uintptrescapes3.go

@@ -0,0 +1,63 @@
+// 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))
+	}
+}