1 // © 2016 and later: Unicode, Inc. and others.
2 // License & terms of use: http://www.unicode.org/copyright.html
3 /*
4 ******************************************************************************
5 *
6 *   Copyright (C) 2002-2012, International Business Machines
7 *   Corporation and others.  All Rights Reserved.
8 *
9 ******************************************************************************
10 *   file name:  uobject.h
11 *   encoding:   UTF-8
12 *   tab size:   8 (not used)
13 *   indentation:4
14 *
15 *   created on: 2002jun26
16 *   created by: Markus W. Scherer
17 */
18 
19 #include "unicode/uobject.h"
20 #include "cmemory.h"
21 
22 U_NAMESPACE_BEGIN
23 
24 #if U_OVERRIDE_CXX_ALLOCATION
25 
26 /*
27  * Default implementation of UMemory::new/delete
28  * using uprv_malloc() and uprv_free().
29  *
30  * For testing, this is used together with a list of imported symbols to verify
31  * that ICU is not using the global ::new and ::delete operators.
32  *
33  * These operators can be implemented like this or any other appropriate way
34  * when customizing ICU for certain environments.
35  * Whenever ICU is customized in binary incompatible ways please be sure
36  * to use library name suffixes to distinguish such libraries from
37  * the standard build.
38  *
39  * Instead of just modifying these C++ new/delete operators, it is usually best
40  * to modify the uprv_malloc()/uprv_free()/uprv_realloc() functions in cmemory.c.
41  *
42  * Memory test on Windows/MSVC 6:
43  * The global operators new and delete look as follows:
44  *   04F 00000000 UNDEF  notype ()    External     | ??2@YAPAXI@Z (void * __cdecl operator new(unsigned int))
45  *   03F 00000000 UNDEF  notype ()    External     | ??3@YAXPAX@Z (void __cdecl operator delete(void *))
46  *
47  * These lines are from output generated by the MSVC 6 tool dumpbin with
48  * dumpbin /symbols *.obj
49  *
50  * ??2@YAPAXI@Z and ??3@YAXPAX@Z are the linker symbols in the .obj
51  * files and are imported from msvcrtd.dll (in a debug build).
52  *
53  * Make sure that with the UMemory operators new and delete defined these two symbols
54  * do not appear in the dumpbin /symbols output for the ICU libraries!
55  *
56  * If such a symbol appears in the output then look in the preceding lines in the output
57  * for which file and function calls the global new or delete operator,
58  * and replace with uprv_malloc/uprv_free.
59  */
60 
61 void * U_EXPORT2 UMemory::operator new(size_t size) noexcept {
62     return uprv_malloc(size);
63 }
64 
65 void U_EXPORT2 UMemory::operator delete(void *p) noexcept {
66     if(p!=nullptr) {
67         uprv_free(p);
68     }
69 }
70 
71 void * U_EXPORT2 UMemory::operator new[](size_t size) noexcept {
72     return uprv_malloc(size);
73 }
74 
75 void U_EXPORT2 UMemory::operator delete[](void *p) noexcept {
76     if(p!=nullptr) {
77         uprv_free(p);
78     }
79 }
80 
81 #if U_HAVE_DEBUG_LOCATION_NEW
82 void * U_EXPORT2 UMemory::operator new(size_t size, const char* /*file*/, int /*line*/) noexcept {
83     return UMemory::operator new(size);
84 }
85 
86 void U_EXPORT2 UMemory::operator delete(void* p, const char* /*file*/, int /*line*/) noexcept {
87     UMemory::operator delete(p);
88 }
89 #endif /* U_HAVE_DEBUG_LOCATION_NEW */
90 
91 
92 #endif
93 
~UObject()94 UObject::~UObject() {}
95 
getDynamicClassID() const96 UClassID UObject::getDynamicClassID() const { return nullptr; }
97 
98 U_NAMESPACE_END
99 
100 U_NAMESPACE_USE
101 
102 U_CAPI void U_EXPORT2
uprv_deleteUObject(void *obj)103 uprv_deleteUObject(void *obj) {
104     delete static_cast<UObject *>(obj);
105 }
106