1 // Copyright 2014 The Go Authors. All rights reserved. 2 // Use of this source code is governed by a BSD-style 3 // license that can be found in the LICENSE file. 4 5 package cgotest 6 7 /* 8 #include <stdint.h> 9 10 typedef struct { 11 char x; 12 long y; 13 } __attribute__((__packed__)) misaligned; 14 15 int 16 offset7560(void) 17 { 18 return (uintptr_t)&((misaligned*)0)->y; 19 } 20 */ 21 import "C" 22 23 import ( 24 "reflect" 25 "testing" 26 ) 27 28 func test7560(t *testing.T) { 29 // some mingw don't implement __packed__ correctly. 30 if C.offset7560() != 1 { 31 t.Skip("C compiler did not pack struct") 32 } 33 34 // C.misaligned should have x but then a padding field to get to the end of the struct. 35 // There should not be a field named 'y'. 36 var v C.misaligned 37 rt := reflect.TypeOf(&v).Elem() 38 if rt.NumField() != 2 || rt.Field(0).Name != "x" || rt.Field(1).Name != "_" { 39 t.Errorf("unexpected fields in C.misaligned:\n") 40 for i := 0; i < rt.NumField(); i++ { 41 t.Logf("%+v\n", rt.Field(i)) 42 } 43 } 44 } 45
