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annotate packages/infra/current/src/delete.cxx @ 66:bf00f99aec69 ecos-sw-2000-02-02

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Merge from eCos master repository on 2000-02-02-19:16:44-GMT
author jlarmour
date Wed, 02 Feb 2000 19:57:02 +0000
parents c38311975d4f
children 6ed91473a1cd
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1 //==========================================================================
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2 //
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3 // common/delete.cxx
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4 //
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5 // Default delete implementation
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6 //
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7 //==========================================================================
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8 //####COPYRIGHTBEGIN####
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9 //
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10 // -------------------------------------------
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11 // The contents of this file are subject to the Red Hat eCos Public License
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12 // Version 1.1 (the "License"); you may not use this file except in
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13 // compliance with the License. You may obtain a copy of the License at
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14 // http://www.redhat.com/
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15 //
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16 // Software distributed under the License is distributed on an "AS IS"
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17 // basis, WITHOUT WARRANTY OF ANY KIND, either express or implied. See the
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18 // License for the specific language governing rights and limitations under
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19 // the License.
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20 //
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21 // The Original Code is eCos - Embedded Configurable Operating System,
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22 // released September 30, 1998.
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23 //
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24 // The Initial Developer of the Original Code is Red Hat.
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25 // Portions created by Red Hat are
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26 // Copyright (C) 1998, 1999, 2000 Red Hat, Inc.
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27 // All Rights Reserved.
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28 // -------------------------------------------
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29 //
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30 //####COPYRIGHTEND####
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31 //==========================================================================
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32 //#####DESCRIPTIONBEGIN####
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33 //
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34 // Author(s): jlarmour
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35 // Contributors: jlarmour
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36 // Date: 1999-08-13
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37 // Purpose: Gives a default delete operation if the C library isn't present
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38 // Description: This file supplies a definition of the default delete
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39 // operation (aka __builtin_delete and __builtin_vec_delete)
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40 // for use when the normal delete can't be used - normally when
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41 // the C library is not present
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42 //
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43 //####DESCRIPTIONEND####
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44 //
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45 //==========================================================================
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46
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47 #include <pkgconf/system.h>
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48
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49 #include <cyg/infra/cyg_type.h>
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50
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51 // The configuration here is as follows:
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52 //
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53 // To deal with virtual destructors, where the correct delete() function
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54 // must be called for the derived class in question, the underlying delete
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55 // is called when needed, from destructors. This is regardless of whether
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56 // the destructor is called by delete itself. So there is a reference to
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57 // delete() from all destructors. The default builtin delete() attempts to
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58 // call free() if there is one defined. So, if you have destructors, and
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59 // you have free(), as in malloc() and free() in the C library, any
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60 // destructor counts as a reference to free(). So the libc heap system is
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61 // linked in regardless of whether it gets explicitly called.
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62 //
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63 // To defeat this undesirable behaviour, we define empty versions of delete
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64 // and delete[]. But doing this prevents proper use of the libc heap in
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65 // C++ programs via C++'s new and delete operators.
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66 //
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67 // Therefore, configuration is provided (in the libc package, near malloc
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68 // et al) for explicitly disabling the provision of these empty functions,
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69 // so that new and delete can be used, if that's what's required.
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70 //
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71 // It is also possible to override all this complexity anyway, but that is
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72 // not yet represented in an external config option.
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73
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74
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75
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76 // If this is already externally defined, go ahead and override the
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77 // builtin delete functions.
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78 #ifndef CYGFUN_INFRA_EMPTY_DELETE_FUNCTIONS
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79
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80 # define CYGFUN_INFRA_EMPTY_DELETE_FUNCTIONS
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81 # ifdef CYGPKG_LIBC
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82 // then there is a libc: if there is a malloc, maybe do not supply empty
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83 // delete functions. Get the libc config info to find out.
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84
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85 # include <pkgconf/libc.h>
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86
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87 // So, do NOT provide these functions if there is a malloc and we are not
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88 // to provide these functions:
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89 # ifdef CYGPKG_LIBC_MALLOC
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90 # ifdef CYGIMP_LIBC_MALLOC_CXX_DELETE_CALLS_FREE
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91 # undef CYGFUN_INFRA_EMPTY_DELETE_FUNCTIONS
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92 # endif // CYGIMP_LIBC_MALLOC_CXX_DELETE_CALLS_FREE
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93 # endif // CYGPKG_LIBC_MALLOC
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94 # endif // CYGPKG_LIBC
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95 #endif // CYGFUN_INFRA_EMPTY_DELETE_FUNCTIONS not already defined
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96
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97 #ifdef CYGFUN_INFRA_EMPTY_DELETE_FUNCTIONS
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98 // then define these empty functions:
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99
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100 void operator delete(void *x) throw()
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101 {
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102 CYG_EMPTY_STATEMENT;
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103 }
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104
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105 void operator delete[](void *x) throw()
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106 {
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107 CYG_EMPTY_STATEMENT;
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108 }
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109
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110 #endif // CYGFUN_INFRA_EMPTY_DELETE_FUNCTIONS
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111
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112 // EOF delete.cxx