icuSources/common/uobject.cpp

   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
  59 void * U_EXPORT2 UMemory::operator new(size_t size) {
  60     return uprv_malloc(size);
  61 }
  62
  63 void U_EXPORT2 UMemory::operator delete(void *p) {
  64     if(p!=NULL) {
  65         uprv_free(p);
  66     }
  67 }
  68
  69 void * U_EXPORT2 UMemory::operator new[](size_t size) {
  70     return uprv_malloc(size);
  71 }
  72
  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
  80 void * U_EXPORT2 UMemory::operator new(size_t size, const char* /*file*/, int /*line*/) {
  81     return UMemory::operator new(size);
  82 }
  83
  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
  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