1 /*
2 ******************************************************************************
3 *
4 * Copyright (C) 2002-2005, International Business Machines
5 * Corporation and others. All Rights Reserved.
6 *
7 ******************************************************************************
8 * file name: uobject.h
9 * encoding: US-ASCII
10 * tab size: 8 (not used)
11 * indentation:4
12 *
13 * created on: 2002jun26
14 * created by: Markus W. Scherer
15 */
16
17 #include "unicode/uobject.h"
18 #include "cmemory.h"
19
20 U_NAMESPACE_BEGIN
21
22 #if U_OVERRIDE_CXX_ALLOCATION
23
24 /*
25 * Default implementation of UMemory::new/delete
26 * using uprv_malloc() and uprv_free().
27 *
28 * For testing, this is used together with a list of imported symbols to verify
29 * that ICU is not using the global ::new and ::delete operators.
30 *
31 * These operators can be implemented like this or any other appropriate way
32 * when customizing ICU for certain environments.
33 * Whenever ICU is customized in binary incompatible ways please be sure
34 * to use library name suffixes to distinguish such libraries from
35 * the standard build.
36 *
37 * Instead of just modifying these C++ new/delete operators, it is usually best
38 * to modify the uprv_malloc()/uprv_free()/uprv_realloc() functions in cmemory.c.
39 *
40 * Memory test on Windows/MSVC 6:
41 * The global operators new and delete look as follows:
42 * 04F 00000000 UNDEF notype () External | ??2@YAPAXI@Z (void * __cdecl operator new(unsigned int))
43 * 03F 00000000 UNDEF notype () External | ??3@YAXPAX@Z (void __cdecl operator delete(void *))
44 *
45 * These lines are from output generated by the MSVC 6 tool dumpbin with
46 * dumpbin /symbols *.obj
47 *
48 * ??2@YAPAXI@Z and ??3@YAXPAX@Z are the linker symbols in the .obj
49 * files and are imported from msvcrtd.dll (in a debug build).
50 *
51 * Make sure that with the UMemory operators new and delete defined these two symbols
52 * do not appear in the dumpbin /symbols output for the ICU libraries!
53 *
54 * If such a symbol appears in the output then look in the preceding lines in the output
55 * for which file and function calls the global new or delete operator,
56 * and replace with uprv_malloc/uprv_free.
57 */
58
operator new(size_t size)59 void * U_EXPORT2 UMemory::operator new(size_t size) {
60 return uprv_malloc(size);
61 }
62
operator delete(void * p)63 void U_EXPORT2 UMemory::operator delete(void *p) {
64 if(p!=NULL) {
65 uprv_free(p);
66 }
67 }
68
operator new[](size_t size)69 void * U_EXPORT2 UMemory::operator new[](size_t size) {
70 return uprv_malloc(size);
71 }
72
operator delete[](void * p)73 void U_EXPORT2 UMemory::operator delete[](void *p) {
74 if(p!=NULL) {
75 uprv_free(p);
76 }
77 }
78
79 #if U_HAVE_DEBUG_LOCATION_NEW
operator new(size_t size,const char *,int)80 void * U_EXPORT2 UMemory::operator new(size_t size, const char* /*file*/, int /*line*/) {
81 return UMemory::operator new(size);
82 }
83
operator delete(void * p,const char *,int)84 void U_EXPORT2 UMemory::operator delete(void* p, const char* /*file*/, int /*line*/) {
85 UMemory::operator delete(p);
86 }
87 #endif /* U_HAVE_DEBUG_LOCATION_NEW */
88
89
90 #endif
91
~UObject()92 UObject::~UObject() {}
93
94 // Future implementation for RTTI that support subtyping. [alan]
95 //
96 // UClassID UObject::getStaticClassID() {
97 // return (UClassID) NULL;
98 // }
99 //
100 // UBool UObject::instanceOf(UClassID type) const {
101 // UClassID c = getDynamicClassID();
102 // for (;;) {
103 // if (c == type) {
104 // return TRUE;
105 // } else if (c == (UClassID) NULL) {
106 // return FALSE;
107 // }
108 // c = * (UClassID*) c;
109 // }
110 // }
111
112 U_NAMESPACE_END
113
114
115