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annotate packages/services/memalloc/common/current/src/malloc.cxx @ 115:6ed91473a1cd ecos-sw-2000-08-21

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Merge from eCos master repository on 2000-08-21-22:40:54-BST
author jlarmour
date Fri, 25 Aug 2000 17:32:38 +0000
parents
children 289bf90c6a9b
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1 //========================================================================
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2 //
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3 // malloc.cxx
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4 //
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5 // Implementation of ISO C memory allocation routines
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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:
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36 // Date: 2000-04-30
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37 // Purpose: Provides ISO C calloc(), malloc(), realloc() and free()
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38 // functions
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39 // Description: Implementation of ISO standard allocation routines as per
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40 // ISO C section 7.10.3
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41 // Usage:
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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 // CONFIGURATION
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48
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49 #include <pkgconf/memalloc.h> // Configuration header
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50
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51 // Do we want these functions?
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52 #ifdef CYGPKG_MEMALLOC_MALLOC_ALLOCATORS
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53
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54 // INCLUDES
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55
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56 #include <cyg/infra/cyg_type.h> // Common type definitions and support
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57 #include <cyg/infra/cyg_trac.h> // Common tracing support
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58 #include <cyg/infra/cyg_ass.h> // Common assertion support
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59 #include <string.h> // For memset() and memmove()
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60 #include <stdlib.h> // header for this file
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61 #include <pkgconf/heaps.hxx> // heap pools information
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62 #include CYGBLD_MEMALLOC_MALLOC_IMPLEMENTATION_HEADER
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63
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64 // STATIC VARIABLES
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65
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66 // First deal with the worst case, that the memory layout didn't define a
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67 // heap
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68 #if CYGMEM_HEAP_COUNT == 0
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69
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70 // the data space for the memory pool
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71 cyg_uint8 cyg_memalloc_mallocpool_memory[
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72 CYGNUM_MEMALLOC_FALLBACK_MALLOC_POOL_SIZE ] CYGBLD_ATTRIB_WEAK;
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73
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74 // the memory pool object itself
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75 CYGCLS_MEMALLOC_MALLOC_IMPL cyg_memalloc_mallocpool
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76 CYGBLD_ATTRIB_INIT_BEFORE( CYG_INIT_LIBC ) =
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77 CYGCLS_MEMALLOC_MALLOC_IMPL( cyg_memalloc_mallocpool_memory,
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78 sizeof( cyg_memalloc_mallocpool_memory ) );
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79
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80 # define POOL cyg_memalloc_mallocpool
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81
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82 #elif CYGMEM_HEAP_COUNT == 1
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83 // one heap, so it's straightforward
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84
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85 # define POOL (*cygmem_memalloc_heaps[0])
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86
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87 #else
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88 // multiple heaps
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89
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90 # include <cyg/memalloc/memjoin.hxx>
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91
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92 Cyg_Mempool_Joined<CYGCLS_MEMALLOC_MALLOC_IMPL> cyg_memalloc_mallocpool
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93 CYGBLD_ATTRIB_INIT_BEFORE( CYG_INIT_LIBC ) =
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94 Cyg_Mempool_Joined<CYGCLS_MEMALLOC_MALLOC_IMPL>(
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95 CYGMEM_HEAP_COUNT, cygmem_memalloc_heaps
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96 );
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97
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98 # define POOL cyg_memalloc_mallocpool
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99
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100 #endif
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101
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102 // FUNCTIONS
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103
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104 void *
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105 malloc( size_t size )
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106 {
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107 void *data_ptr;
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108
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109 CYG_REPORT_FUNCNAMETYPE( "malloc", "returning pointer %08x" );
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110
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111 CYG_REPORT_FUNCARG1DV( size );
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112
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113 // first check if size wanted is 0
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114 if ( 0 == size ) {
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115 CYG_REPORT_RETVAL( NULL );
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116 return NULL;
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117 } // if
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118
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119 // ask the pool for the data
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120 data_ptr = POOL.try_alloc( size );
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121
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122 // if it isn't NULL is the pointer valid?
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123 if ( NULL != data_ptr ) {
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124 CYG_CHECK_DATA_PTR( data_ptr,
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125 "allocator returned invalid pointer!" );
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126
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127 // And just check its alignment
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128 CYG_ASSERT( !((CYG_ADDRWORD)data_ptr & (sizeof(CYG_ADDRWORD) - 1)),
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129 "Allocator has returned badly aligned data!");
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130 } // if
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131
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132 CYG_REPORT_RETVAL( data_ptr );
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133
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134 return data_ptr;
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135 } // malloc()
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136
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137
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138 void
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139 free( void *ptr )
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140 {
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141 cyg_bool freeret;
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142
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143 CYG_REPORT_FUNCNAME( "free");
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144
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145 CYG_REPORT_FUNCARG1XV( ptr );
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146
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147 // if null pointer, do nothing as per spec
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148 if ( NULL==ptr )
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149 return;
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150
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151 CYG_CHECK_DATA_PTR( ptr, "Pointer to free isn't even valid!" );
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152
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153 // get pool to free it
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154 freeret = POOL.free( (cyg_uint8 *) ptr );
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155
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156 CYG_ASSERT( freeret , "Couldn't free!" );
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157
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158 CYG_REPORT_RETURN();
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159
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160 } // free()
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161
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162
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163 void *
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164 calloc( size_t nmemb, size_t size )
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165 {
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166 void *data_ptr;
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167 cyg_ucount32 realsize;
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168
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169 CYG_REPORT_FUNCNAMETYPE( "calloc", "returning pointer %08x" );
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170
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171 CYG_REPORT_FUNCARG2DV( nmemb, size );
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172
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173 realsize = nmemb * size;
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174
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175 data_ptr = malloc( realsize );
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176
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177 // Fill with 0's if non-NULL
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178 if ( data_ptr != NULL )
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179 memset( data_ptr, 0, realsize );
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180
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181 CYG_REPORT_RETVAL( data_ptr );
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182 return data_ptr;
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183 } // calloc()
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184
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185
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186 externC void *
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187 realloc( void *ptr, size_t size )
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188 {
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189 cyg_int32 oldsize;
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190
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191 CYG_REPORT_FUNCNAMETYPE( "realloc", "returning pointer %08x" );
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192
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193 CYG_REPORT_FUNCARG2( "ptr=%08x, size=%d", ptr, size );
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194
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195 // if pointer is NULL, we must malloc it
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196 if ( ptr == NULL ) {
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197 ptr = malloc( size );
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198 CYG_REPORT_RETVAL( ptr );
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199 return ptr;
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200 } // if
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201
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202 CYG_CHECK_DATA_PTR( ptr, "realloc() passed a bogus pointer!" );
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203
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204 // if size is 0, we must free it
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205 if (size == 0) {
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206 free(ptr);
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207 CYG_REPORT_RETVAL( NULL );
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208 return NULL;
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209 } // if
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210
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211 void *newptr;
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212
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213 // otherwise try to resize allocation
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214 newptr = POOL.resize_alloc( (cyg_uint8 *)ptr, size, &oldsize );
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215
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216 if ( NULL == newptr ) {
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217 // if resize_alloc doesn't return a pointer, it failed, so we
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218 // just have to allocate new space instead, and later copy it
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219
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220 CYG_ASSERT( oldsize != 0,
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221 "resize_alloc() couldn't determine allocation size!" );
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222
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223 newptr = malloc( size );
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224
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225 if ( NULL != newptr ) {
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226 memcpy( newptr, ptr, size < (size_t) oldsize ? size
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227 : (size_t) oldsize );
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228 free( ptr );
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229 }
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230 }
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231
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232 CYG_REPORT_RETVAL( newptr );
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233 return newptr;
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234 } // realloc()
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235
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236
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237 externC struct mallinfo
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238 mallinfo( void )
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239 {
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240 struct mallinfo ret = { 0 }; // initialize to all zeros
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241 Cyg_Mempool_Status stat;
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242
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243 CYG_REPORT_FUNCTION();
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244
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245 POOL.get_status( CYG_MEMPOOL_STAT_ARENASIZE|
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246 CYG_MEMPOOL_STAT_FREEBLOCKS|
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247 CYG_MEMPOOL_STAT_TOTALALLOCATED|
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248 CYG_MEMPOOL_STAT_TOTALFREE|
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249 CYG_MEMPOOL_STAT_MAXFREE, stat );
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250
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251 if ( stat.arenasize > 0 )
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252 ret.arena = stat.arenasize;
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253
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254 if ( stat.freeblocks > 0 )
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255 ret.ordblks = stat.freeblocks;
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256
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257 if ( stat.totalallocated > 0 )
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258 ret.uordblks = stat.totalallocated;
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259
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260 if ( stat.totalfree > 0 )
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261 ret.fordblks = stat.totalfree;
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262
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263 if ( stat.maxfree > 0 )
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264 ret.maxfree = stat.maxfree;
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265
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266 CYG_REPORT_RETURN();
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267 return ret;
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268 } // mallinfo()
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269
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270 #endif // ifdef CYGPKG_MEMALLOC_MALLOC_ALLOCATORS
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271
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272 // EOF malloc.cxx