Source file test/uintptrescapes3.go

     1  // run
     2  
     3  // Copyright 2019 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  // Test that //go:uintptrescapes works for methods.
     8  
     9  package main
    10  
    11  import (
    12  	"fmt"
    13  	"runtime"
    14  	"unsafe"
    15  )
    16  
    17  var callback func()
    18  
    19  //go:noinline
    20  //go:uintptrescapes
    21  func F(ptr uintptr) { callback() }
    22  
    23  //go:noinline
    24  //go:uintptrescapes
    25  func Fv(ptrs ...uintptr) { callback() }
    26  
    27  type T struct{}
    28  
    29  //go:noinline
    30  //go:uintptrescapes
    31  func (T) M(ptr uintptr) { callback() }
    32  
    33  //go:noinline
    34  //go:uintptrescapes
    35  func (T) Mv(ptrs ...uintptr) { callback() }
    36  
    37  // Each test should pass uintptr(ptr) as an argument to a function call,
    38  // which in turn should call callback. The callback checks that ptr is kept alive.
    39  var tests = []func(ptr unsafe.Pointer){
    40  	func(ptr unsafe.Pointer) { F(uintptr(ptr)) },
    41  	func(ptr unsafe.Pointer) { Fv(uintptr(ptr)) },
    42  	func(ptr unsafe.Pointer) { T{}.M(uintptr(ptr)) },
    43  	func(ptr unsafe.Pointer) { T{}.Mv(uintptr(ptr)) },
    44  }
    45  
    46  func main() {
    47  	for i, test := range tests {
    48  		finalized := false
    49  
    50  		ptr := new([64]byte)
    51  		runtime.SetFinalizer(ptr, func(*[64]byte) {
    52  			finalized = true
    53  		})
    54  
    55  		callback = func() {
    56  			runtime.GC()
    57  			if finalized {
    58  				fmt.Printf("test #%d failed\n", i)
    59  			}
    60  		}
    61  		test(unsafe.Pointer(ptr))
    62  	}
    63  }
    64  

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