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https://github.com/golang/go
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b868616b63
Some C types are declared as pointers, but C code stores non-pointers in them. When the Go garbage collector sees such a pointer, it gets unhappy. Instead, for these types represent them on the Go side with uintptr. We need this change to handle Apple's CoreFoundation CF*Ref types. Users of these types might need to update their code like we do in root_cgo_darwin.go. The only change that is required under normal circumstances is converting some nils to 0. A go fix module is provided to help. Fixes #21897 RELNOTE=yes Change-Id: I9716cfb255dc918792625f42952aa171cd31ec1b Reviewed-on: https://go-review.googlesource.com/66332 Run-TryBot: Keith Randall <khr@golang.org> Reviewed-by: Robert Griesemer <gri@golang.org> Reviewed-by: Ian Lance Taylor <iant@golang.org>
57 lines
1.4 KiB
Go
57 lines
1.4 KiB
Go
// Copyright 2017 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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// +build darwin,cgo,!internal
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package cgotest
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/*
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#cgo LDFLAGS: -framework CoreFoundation
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#include <CoreFoundation/CoreFoundation.h>
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*/
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import "C"
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import (
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"runtime/debug"
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"testing"
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"unsafe"
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)
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func test21897(t *testing.T) {
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// Please write barrier, kick in soon.
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defer debug.SetGCPercent(debug.SetGCPercent(1))
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for i := 0; i < 10000; i++ {
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testCFNumberRef()
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testCFDateRef()
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testCFBooleanRef()
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// Allocate some memory, so eventually the write barrier is enabled
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// and it will see writes of bad pointers in the test* functions below.
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byteSliceSink = make([]byte, 1024)
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}
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}
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var byteSliceSink []byte
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func testCFNumberRef() {
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var v int64 = 0
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xCFNumberRef = C.CFNumberCreate(C.kCFAllocatorSystemDefault, C.kCFNumberSInt64Type, unsafe.Pointer(&v))
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//fmt.Printf("CFNumberRef: %x\n", uintptr(unsafe.Pointer(xCFNumberRef)))
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}
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var xCFNumberRef C.CFNumberRef
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func testCFDateRef() {
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xCFDateRef = C.CFDateCreate(C.kCFAllocatorSystemDefault, 0) // 0 value is 1 Jan 2001 00:00:00 GMT
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//fmt.Printf("CFDateRef: %x\n", uintptr(unsafe.Pointer(xCFDateRef)))
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}
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var xCFDateRef C.CFDateRef
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func testCFBooleanRef() {
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xCFBooleanRef = C.kCFBooleanFalse
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//fmt.Printf("CFBooleanRef: %x\n", uintptr(unsafe.Pointer(xCFBooleanRef)))
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}
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var xCFBooleanRef C.CFBooleanRef
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