1a5728872c7702ddd09537c95bc3cbd20e1f2fb09Daniel Dunbar// RUN: %clang_cc1 -fsyntax-only -verify %s 2d3fb6adc8879dc0c77b540c4c89561c8a9c8bca1Chris Lattner 3d3fb6adc8879dc0c77b540c4c89561c8a9c8bca1Chris Lattner#define offsetof(TYPE, MEMBER) __builtin_offsetof (TYPE, MEMBER) 4d3fb6adc8879dc0c77b540c4c89561c8a9c8bca1Chris Lattner 5d3fb6adc8879dc0c77b540c4c89561c8a9c8bca1Chris Lattnertypedef struct P { int i; float f; } PT; 6d3fb6adc8879dc0c77b540c4c89561c8a9c8bca1Chris Lattnerstruct external_sun3_core 7d3fb6adc8879dc0c77b540c4c89561c8a9c8bca1Chris Lattner{ 8d3fb6adc8879dc0c77b540c4c89561c8a9c8bca1Chris Lattner unsigned c_regs; 9d3fb6adc8879dc0c77b540c4c89561c8a9c8bca1Chris Lattner 10d3fb6adc8879dc0c77b540c4c89561c8a9c8bca1Chris Lattner PT X[100]; 11d3fb6adc8879dc0c77b540c4c89561c8a9c8bca1Chris Lattner 12d3fb6adc8879dc0c77b540c4c89561c8a9c8bca1Chris Lattner}; 13d3fb6adc8879dc0c77b540c4c89561c8a9c8bca1Chris Lattner 14d3fb6adc8879dc0c77b540c4c89561c8a9c8bca1Chris Lattnervoid swap() 15d3fb6adc8879dc0c77b540c4c89561c8a9c8bca1Chris Lattner{ 16d3fb6adc8879dc0c77b540c4c89561c8a9c8bca1Chris Lattner int x; 17d3fb6adc8879dc0c77b540c4c89561c8a9c8bca1Chris Lattner x = offsetof(struct external_sun3_core, c_regs); 18d3fb6adc8879dc0c77b540c4c89561c8a9c8bca1Chris Lattner x = __builtin_offsetof(struct external_sun3_core, X[42].f); 19d3fb6adc8879dc0c77b540c4c89561c8a9c8bca1Chris Lattner 20d3fb6adc8879dc0c77b540c4c89561c8a9c8bca1Chris Lattner x = __builtin_offsetof(struct external_sun3_core, X[42].f2); // expected-error {{no member named 'f2'}} 21d3fb6adc8879dc0c77b540c4c89561c8a9c8bca1Chris Lattner x = __builtin_offsetof(int, X[42].f2); // expected-error {{offsetof requires struct}} 225a1deb8d9c0722beae28d693fa137bbb942bd11fAnders Carlsson 235a1deb8d9c0722beae28d693fa137bbb942bd11fAnders Carlsson int a[__builtin_offsetof(struct external_sun3_core, X) == 4 ? 1 : -1]; 245a1deb8d9c0722beae28d693fa137bbb942bd11fAnders Carlsson int b[__builtin_offsetof(struct external_sun3_core, X[42]) == 340 ? 1 : -1]; 25e0c5414f0514a23a5c8c434c81b9f0a35517ab63Chris Lattner int c[__builtin_offsetof(struct external_sun3_core, X[42].f2) == 344 ? 1 : -1]; // expected-error {{no member named 'f2'}} 26d3fb6adc8879dc0c77b540c4c89561c8a9c8bca1Chris Lattner} 27d3fb6adc8879dc0c77b540c4c89561c8a9c8bca1Chris Lattner 28601bae3b1d3c06e8c91f6ea77dd2b0315353ee0bAnders Carlssonextern int f(); 29e0c5414f0514a23a5c8c434c81b9f0a35517ab63Chris Lattner 30e0c5414f0514a23a5c8c434c81b9f0a35517ab63Chris Lattnerstruct s1 { int a; }; 31601bae3b1d3c06e8c91f6ea77dd2b0315353ee0bAnders Carlssonint v1 = offsetof (struct s1, a) == 0 ? 0 : f(); 32e0c5414f0514a23a5c8c434c81b9f0a35517ab63Chris Lattner 33e0c5414f0514a23a5c8c434c81b9f0a35517ab63Chris Lattnerstruct s2 { int a; }; 34601bae3b1d3c06e8c91f6ea77dd2b0315353ee0bAnders Carlssonint v2 = (int)(&((struct s2 *) 0)->a) == 0 ? 0 : f(); 35e0c5414f0514a23a5c8c434c81b9f0a35517ab63Chris Lattner 36e0c5414f0514a23a5c8c434c81b9f0a35517ab63Chris Lattnerstruct s3 { int a; }; 37601bae3b1d3c06e8c91f6ea77dd2b0315353ee0bAnders Carlssonint v3 = __builtin_offsetof(struct s3, a) == 0 ? 0 : f(); 3835183aca180a2b9b2c637cd625a40a7e147d6a32Eli Friedman 3935183aca180a2b9b2c637cd625a40a7e147d6a32Eli Friedman// PR3396 4035183aca180a2b9b2c637cd625a40a7e147d6a32Eli Friedmanstruct sockaddr_un { 4135183aca180a2b9b2c637cd625a40a7e147d6a32Eli Friedman unsigned char sun_len; 4235183aca180a2b9b2c637cd625a40a7e147d6a32Eli Friedman char sun_path[104]; 4335183aca180a2b9b2c637cd625a40a7e147d6a32Eli Friedman}; 4435183aca180a2b9b2c637cd625a40a7e147d6a32Eli Friedmanint a(int len) { 4535183aca180a2b9b2c637cd625a40a7e147d6a32Eli Friedmanint a[__builtin_offsetof(struct sockaddr_un, sun_path[len+1])]; 4635183aca180a2b9b2c637cd625a40a7e147d6a32Eli Friedman} 4735183aca180a2b9b2c637cd625a40a7e147d6a32Eli Friedman 48e93569666e330ca66ed4b3f58d2c15f3d9b24cd1Eli Friedman// PR4079 49e93569666e330ca66ed4b3f58d2c15f3d9b24cd1Eli Friedmanunion x {struct {int x;};}; 50e93569666e330ca66ed4b3f58d2c15f3d9b24cd1Eli Friedmanint x[__builtin_offsetof(union x, x)]; 51d00f200f64994858492558b54c6f6f2b3d4b4310John McCall 52d00f200f64994858492558b54c6f6f2b3d4b4310John McCall// rdar://problem/7222956 53d00f200f64994858492558b54c6f6f2b3d4b4310John McCallstruct incomplete; // expected-note 2 {{forward declaration of 'struct incomplete'}} 54d00f200f64994858492558b54c6f6f2b3d4b4310John McCallint test1[__builtin_offsetof(struct incomplete, foo)]; // expected-error {{offsetof of incomplete type 'struct incomplete'}} 55d00f200f64994858492558b54c6f6f2b3d4b4310John McCall 569d5d60ff8d7991234abcc6a9fe9903db930be0a1Douglas Gregorint test2[__builtin_offsetof(struct incomplete[10], [4].foo)]; // expected-error {{array has incomplete element type 'struct incomplete'}} 579d5d60ff8d7991234abcc6a9fe9903db930be0a1Douglas Gregor 589d5d60ff8d7991234abcc6a9fe9903db930be0a1Douglas Gregor// Bitfields 599d5d60ff8d7991234abcc6a9fe9903db930be0a1Douglas Gregorstruct has_bitfields { 609d5d60ff8d7991234abcc6a9fe9903db930be0a1Douglas Gregor int i : 7; 619d5d60ff8d7991234abcc6a9fe9903db930be0a1Douglas Gregor int j : 12; // expected-note{{bit-field is declared here}} 629d5d60ff8d7991234abcc6a9fe9903db930be0a1Douglas Gregor}; 639d5d60ff8d7991234abcc6a9fe9903db930be0a1Douglas Gregor 649d5d60ff8d7991234abcc6a9fe9903db930be0a1Douglas Gregorint test3 = __builtin_offsetof(struct has_bitfields, j); // expected-error{{cannot compute offset of bit-field 'j'}} 6572be24f39c162448e53dd73cf57cc6357114361eDouglas Gregor 6672be24f39c162448e53dd73cf57cc6357114361eDouglas Gregortypedef struct Array { int array[1]; } Array; 6772be24f39c162448e53dd73cf57cc6357114361eDouglas Gregorint test4 = __builtin_offsetof(Array, array); 68d82e5d30930f80a92c1270e270fdb475e3718d25Richard Smith 69d82e5d30930f80a92c1270e270fdb475e3718d25Richard Smithint test5() { 70d82e5d30930f80a92c1270e270fdb475e3718d25Richard Smith return __builtin_offsetof(Array, array[*(int*)0]); // expected-warning{{indirection of non-volatile null pointer}} expected-note{{__builtin_trap}} 71d82e5d30930f80a92c1270e270fdb475e3718d25Richard Smith} 72910f17e331221cd0833d0b5b49013cbbc7ef122aRichard Trieu 73