]>
Commit | Line | Data |
---|---|---|
1 | // Copyright (C) 2018-2024 Free Software Foundation, Inc. | |
2 | // | |
3 | // This file is part of the GNU ISO C++ Library. This library is free | |
4 | // software; you can redistribute it and/or modify it under the | |
5 | // terms of the GNU General Public License as published by the | |
6 | // Free Software Foundation; either version 3, or (at your option) | |
7 | // any later version. | |
8 | ||
9 | // This library is distributed in the hope that it will be useful, | |
10 | // but WITHOUT ANY WARRANTY; without even the implied warranty of | |
11 | // MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the | |
12 | // GNU General Public License for more details. | |
13 | ||
14 | // You should have received a copy of the GNU General Public License along | |
15 | // with this library; see the file COPYING3. If not see | |
16 | // <http://www.gnu.org/licenses/>. | |
17 | ||
18 | // { dg-do run { target c++17 } } | |
19 | ||
20 | #include <new> | |
21 | #include <memory> | |
22 | #include <testsuite_hooks.h> | |
23 | ||
24 | struct Test | |
25 | { | |
26 | Test(std::size_t size, std::size_t a) | |
27 | : size(size), alignment(std::align_val_t{a}), | |
28 | p(::operator new(size, alignment)) | |
29 | { } | |
30 | ||
31 | ~Test() { ::operator delete(p, size, alignment); } | |
32 | ||
33 | std::size_t size; | |
34 | std::align_val_t alignment; | |
35 | void* p; | |
36 | ||
37 | bool valid() const { return p != nullptr; } | |
38 | ||
39 | bool aligned() const | |
40 | { | |
41 | auto ptr = p; | |
42 | auto space = size; | |
43 | return std::align((std::size_t)alignment, size, ptr, space) == p; | |
44 | } | |
45 | }; | |
46 | ||
47 | // operator new(size_t size, align_val_t alignment) has | |
48 | // undefined behaviour if the alignment argument is not | |
49 | // a valid alignment value (i.e. not a power of two). | |
50 | // | |
51 | // Unlike posix_memalign there is no requirement that | |
52 | // alignment >= sizeof(void*). | |
53 | // | |
54 | // Unlike aligned_alloc there is no requirement that | |
55 | // size is an integer multiple of alignment. | |
56 | ||
57 | void | |
58 | test01() | |
59 | { | |
60 | // Test small values that would not be valid for | |
61 | // posix_memalign or aligned_alloc. | |
62 | ||
63 | Test t11{1, 1}; | |
64 | VERIFY( t11.valid() ); | |
65 | VERIFY( t11.aligned() ); | |
66 | ||
67 | Test t21{2, 1}; | |
68 | VERIFY( t21.valid() ); | |
69 | VERIFY( t21.aligned() ); | |
70 | ||
71 | Test t12{1, 2}; | |
72 | VERIFY( t12.valid() ); | |
73 | VERIFY( t12.aligned() ); | |
74 | ||
75 | Test t22{2, 2}; | |
76 | VERIFY( t22.valid() ); | |
77 | VERIFY( t22.aligned() ); | |
78 | ||
79 | Test t32{3, 2}; | |
80 | VERIFY( t32.valid() ); | |
81 | VERIFY( t32.aligned() ); | |
82 | ||
83 | Test t42{4, 2}; | |
84 | VERIFY( t42.valid() ); | |
85 | VERIFY( t42.aligned() ); | |
86 | ||
87 | Test t24{2, 4}; | |
88 | VERIFY( t24.valid() ); | |
89 | VERIFY( t24.aligned() ); | |
90 | ||
91 | Test t34{3, 4}; | |
92 | VERIFY( t34.valid() ); | |
93 | VERIFY( t34.aligned() ); | |
94 | ||
95 | Test t44{4, 4}; | |
96 | VERIFY( t44.valid() ); | |
97 | VERIFY( t44.aligned() ); | |
98 | ||
99 | // Test some larger values. | |
100 | ||
101 | Test t128_16{128, 16}; | |
102 | VERIFY( t128_16.valid() ); | |
103 | VERIFY( t128_16.aligned() ); | |
104 | ||
105 | Test t128_64{128, 64}; | |
106 | VERIFY( t128_64.valid() ); | |
107 | VERIFY( t128_64.aligned() ); | |
108 | ||
109 | Test t64_128{64, 128}; | |
110 | VERIFY( t64_128.valid() ); | |
111 | VERIFY( t64_128.aligned() ); | |
112 | } | |
113 | ||
114 | int | |
115 | main() | |
116 | { | |
117 | test01(); | |
118 | } |