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 __attribute__((weak))
operator new(size_t size)75 void* operator new(size_t size)
76 {
77 if (0 == size)
78 {
79 size = 1;
80 }
81 void * mem = malloc(size);
82 while (0 == mem)
83 {
84 new_handler h = std::get_new_handler();
85 if (0 != h)
86 {
87 h();
88 }
89 else
90 {
91 throw std::bad_alloc();
92 }
93 mem = malloc(size);
94 }
95
96 return mem;
97 }
98
99 __attribute__((weak))
operator new(size_t size,const std::nothrow_t &)100 void* operator new(size_t size, const std::nothrow_t &) throw()
101 {
102 try {
103 return :: operator new(size);
104 } catch (...) {
105 // nothrow operator new should return NULL in case of
106 // std::bad_alloc exception in new handler
107 return NULL;
108 }
109 }
110
111
112 __attribute__((weak))
operator delete(void * ptr)113 void operator delete(void * ptr)
114 #if __cplusplus < 201000L
115 throw()
116 #endif
117 {
118 free(ptr);
119 }
120
121
122 __attribute__((weak))
operator new[](size_t size)123 void * operator new[](size_t size)
124 #if __cplusplus < 201000L
125 throw(std::bad_alloc)
126 #endif
127 {
128 return ::operator new(size);
129 }
130
131
132 __attribute__((weak))
operator new[](size_t size,const std::nothrow_t &)133 void * operator new[](size_t size, const std::nothrow_t &) throw()
134 {
135 try {
136 return ::operator new[](size);
137 } catch (...) {
138 // nothrow operator new should return NULL in case of
139 // std::bad_alloc exception in new handler
140 return NULL;
141 }
142 }
143
144
145 __attribute__((weak))
operator delete[](void * ptr)146 void operator delete[](void * ptr)
147 #if __cplusplus < 201000L
148 throw()
149 #endif
150 {
151 ::operator delete(ptr);
152 }
153
154
155