Mercurial > hg > CbC > CbC_gcc
view gcc/testsuite/g++.dg/abi/empty4.C @ 131:84e7813d76e9
gcc-8.2
author | mir3636 |
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date | Thu, 25 Oct 2018 07:37:49 +0900 |
parents | 04ced10e8804 |
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// { dg-do run } // Copyright (C) 2001 Free Software Foundation, Inc. // Contributed by Nathan Sidwell 31 Jul 2001 <nathan@codesourcery.com> // Bug 3820. We were bit copying empty bases including the // padding. Which clobbers whatever they overlay. struct Empty {}; struct Inter : Empty {}; long now = 0; struct NonPod { long m; NonPod () {m = 0x12345678;} NonPod (long m_) {m = m_;} NonPod &operator= (NonPod const &src) {now = m; m = src.m; return *this;} NonPod (NonPod const &src) {m = src.m;} }; struct A : Inter { A (long c) {m = c;} NonPod m; }; struct B { Inter empty; NonPod m; B (long c) {m = c;} }; #if __cpp_attributes struct B2 { [[no_unique_address]] Inter empty; NonPod m; B2 (long c) {m = c;} }; #endif struct C : NonPod, Inter { C (long c) : NonPod (c), Inter () {} }; int main () { A a (0x12131415); long was = a.m.m; a = 0x22232425; if (was != now) return 1; // we copied the empty base which clobbered a.m.m's // original value. A b (0x32333435); *(Inter *)&a = *(Inter *)&b; if (a.m.m != 0x22232425) return 2; // we copied padding, which clobbered a.m.m A b2 (0x32333435); (Inter &)b2 = Inter (); if (b2.m.m != 0x32333435) return 2; // we copied padding, which clobbered b2.m.m { B c (0x12131415); was = c.m.m; c = 0x22232425; if (was != now) return 3; B d (0x32333435); c.empty = d.empty; if (c.m.m != 0x22232425) return 4; } #if __cpp_attributes { B2 c (0x12131415); was = c.m.m; c = 0x22232425; if (was != now) return 3; B2 d (0x32333435); c.empty = d.empty; if (c.m.m != 0x22232425) return 4; } #endif C e (0x32333435); if (e.m != 0x32333435) return 2; // we copied padding return 0; }