1 /*
2 * Copyright 2010-2011 PathScale, Inc. All rights reserved.
3 *
4 * Redistribution and use in source and binary forms, with or without
5 * modification, are permitted provided that the following conditions are met:
6 *
7 * 1. Redistributions of source code must retain the above copyright notice,
8 * this list of conditions and the following disclaimer.
9 *
10 * 2. Redistributions in binary form must reproduce the above copyright notice,
11 * this list of conditions and the following disclaimer in the documentation
12 * and/or other materials provided with the distribution.
13 *
14 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS ``AS
15 * IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO,
16 * THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
17 * PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR
18 * CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL,
19 * EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,
20 * PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS;
21 * OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY,
22 * WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR
23 * OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF
24 * ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
25 */
26
27 /**
28 * memory.cc - Contains stub definition of C++ new/delete operators.
29 *
30 * These definitions are intended to be used for testing and are weak symbols
31 * to allow them to be replaced by definitions from a STL implementation.
32 * These versions simply wrap malloc() and free(), they do not provide a
33 * C++-specific allocator.
34 */
35
36 #include <stddef.h>
37 #include <stdlib.h>
38 #include "stdexcept.h"
39 #include "atomic.h"
40
41
42 namespace std
43 {
44 struct nothrow_t {};
45 }
46
47
48 /// The type of the function called when allocation fails.
49 typedef void (*new_handler)();
50 /**
51 * The function to call when allocation fails. By default, there is no
52 * handler and a bad allocation exception is thrown if an allocation fails.
53 */
54 static new_handler new_handl;
55
56 namespace std
57 {
58 /**
59 * Sets a function to be called when there is a failure in new.
60 */
61 __attribute__((weak))
set_new_handler(new_handler handler)62 new_handler set_new_handler(new_handler handler)
63 {
64 return ATOMIC_SWAP(&new_handl, handler);
65 }
66 __attribute__((weak))
get_new_handler(void)67 new_handler get_new_handler(void)
68 {
69 return ATOMIC_LOAD(&new_handl);
70 }
71 }
72
73
74 #if __cplusplus < 201103L
75 #define NOEXCEPT throw()
76 #define BADALLOC throw(std::bad_alloc)
77 #else
78 #define NOEXCEPT noexcept
79 #define BADALLOC
80 #endif
81
82
83 __attribute__((weak))
operator new(size_t size)84 void* operator new(size_t size) BADALLOC
85 {
86 if (0 == size)
87 {
88 size = 1;
89 }
90 void * mem = malloc(size);
91 while (0 == mem)
92 {
93 new_handler h = std::get_new_handler();
94 if (0 != h)
95 {
96 h();
97 }
98 else
99 {
100 throw std::bad_alloc();
101 }
102 mem = malloc(size);
103 }
104
105 return mem;
106 }
107
108 __attribute__((weak))
operator new(size_t size,const std::nothrow_t &)109 void* operator new(size_t size, const std::nothrow_t &) NOEXCEPT
110 {
111 try {
112 return :: operator new(size);
113 } catch (...) {
114 // nothrow operator new should return NULL in case of
115 // std::bad_alloc exception in new handler
116 return NULL;
117 }
118 }
119
120
121 __attribute__((weak))
operator delete(void * ptr)122 void operator delete(void * ptr) NOEXCEPT
123 {
124 free(ptr);
125 }
126
127
128 __attribute__((weak))
operator new[](size_t size)129 void * operator new[](size_t size) BADALLOC
130 {
131 return ::operator new(size);
132 }
133
134
135 __attribute__((weak))
operator new[](size_t size,const std::nothrow_t &)136 void * operator new[](size_t size, const std::nothrow_t &) NOEXCEPT
137 {
138 try {
139 return ::operator new[](size);
140 } catch (...) {
141 // nothrow operator new should return NULL in case of
142 // std::bad_alloc exception in new handler
143 return NULL;
144 }
145 }
146
147
148 __attribute__((weak))
operator delete[](void * ptr)149 void operator delete[](void * ptr) NOEXCEPT
150 {
151 ::operator delete(ptr);
152 }
153
154 // C++14 additional delete operators
155
156 #if __cplusplus >= 201402L
157
158 __attribute__((weak))
operator delete(void * ptr,size_t)159 void operator delete(void * ptr, size_t) NOEXCEPT
160 {
161 ::operator delete(ptr);
162 }
163
164
165 __attribute__((weak))
operator delete[](void * ptr,size_t)166 void operator delete[](void * ptr, size_t) NOEXCEPT
167 {
168 ::operator delete(ptr);
169 }
170
171 #endif
172