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689947d565
In a function argument, we handle a typedef for a pointer specially, using the pointer type rather than the typedef, to permit the Go calls to match the laxer type conversions permitted in C. We record the typedef so that we use that type in the C code, in case it has a special attribute. However, using the typedef is wrong when using a pointer to a basic type, because the C code may sometimes use the typedef and sometimes not, and using the typedef in all cases will cause incorrect type errors on the Go side. Fortunately we only really need to use the typedef when pointing to a struct/union/class, and in such a case confusion is unlikely. Fixes #17723. Change-Id: Id2eaeb156faeaf2e8eb9cf0b8f95b44caf8cfbd2 Reviewed-on: https://go-review.googlesource.com/32536 Run-TryBot: Ian Lance Taylor <iant@golang.org> Reviewed-by: David Crawshaw <crawshaw@golang.org>
31 lines
740 B
Go
31 lines
740 B
Go
// Copyright 2013 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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// API Compatibility Checks for cgo
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package cgotest
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// #include <stdlib.h>
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//
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// // Test for issue 17723.
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// typedef char *cstring_pointer;
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// static void cstring_pointer_fun(cstring_pointer dummy) { }
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//
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// const char *api_hello = "hello!";
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import "C"
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import "unsafe"
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func testAPI() {
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var cs *C.char
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cs = C.CString("hello")
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defer C.free(unsafe.Pointer(cs))
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var s string
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s = C.GoString((*C.char)(C.api_hello))
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s = C.GoStringN((*C.char)(C.api_hello), C.int(6))
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var b []byte
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b = C.GoBytes(unsafe.Pointer(C.api_hello), C.int(6))
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_, _ = s, b
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C.cstring_pointer_fun(nil)
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}
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