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
22U_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
61void * U_EXPORT2 UMemory::operator new(size_t size) noexcept {
62    return uprv_malloc(size);
63}
64
65void U_EXPORT2 UMemory::operator delete(void *p) noexcept {
66    if(p!=nullptr) {
67        uprv_free(p);
68    }
69}
70
71void * U_EXPORT2 UMemory::operator new[](size_t size) noexcept {
72    return uprv_malloc(size);
73}
74
75void 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
82void * U_EXPORT2 UMemory::operator new(size_t size, const char* /*file*/, int /*line*/) noexcept {
83    return UMemory::operator new(size);
84}
85
86void 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
94UObject::~UObject() {}
95
96UClassID UObject::getDynamicClassID() const { return nullptr; }
97
98U_NAMESPACE_END
99
100U_NAMESPACE_USE
101
102U_CAPI void U_EXPORT2
103uprv_deleteUObject(void *obj) {
104    delete static_cast<UObject *>(obj);
105}
106