Mercurial > flash_v2

annotate packages/services/memalloc/common/current/src/malloc.cxx @ 176:3902ef905c9c

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Merge from eCos master repository on 2001-08-03-06:43:13-BST
author jlarmour
date Fri, 03 Aug 2001 12:27:32 +0000
parents 289bf90c6a9b
children e0c0827131d1
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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
176
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61 #ifdef CYGBLD_MEMALLOC_MALLOC_EXTERNAL_HEAP_H
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62 # include CYGBLD_MEMALLOC_MALLOC_EXTERNAL_HEAP_H
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63 #else
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64 # include <pkgconf/heaps.hxx> // heap pools information
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65 #endif
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66 #include CYGBLD_MEMALLOC_MALLOC_IMPLEMENTATION_HEADER
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67
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68 // STATIC VARIABLES
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69
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70 // First deal with the worst case, that the memory layout didn't define a
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71 // heap
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72 #if CYGMEM_HEAP_COUNT == 0
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73
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74 // the data space for the memory pool
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75 cyg_uint8 cyg_memalloc_mallocpool_memory[
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76 CYGNUM_MEMALLOC_FALLBACK_MALLOC_POOL_SIZE ] CYGBLD_ATTRIB_WEAK;
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77
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78 // the memory pool object itself
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79 CYGCLS_MEMALLOC_MALLOC_IMPL cyg_memalloc_mallocpool
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80 CYGBLD_ATTRIB_INIT_BEFORE( CYG_INIT_LIBC ) =
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81 CYGCLS_MEMALLOC_MALLOC_IMPL( cyg_memalloc_mallocpool_memory,
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82 sizeof( cyg_memalloc_mallocpool_memory ) );
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83
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84 # define POOL cyg_memalloc_mallocpool
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85
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86 #elif CYGMEM_HEAP_COUNT == 1
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87 // one heap, so it's straightforward
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88
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89 # define POOL (*cygmem_memalloc_heaps[0])
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90
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91 #else
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92 // multiple heaps
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93
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94 # include <cyg/memalloc/memjoin.hxx>
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95
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96 Cyg_Mempool_Joined<CYGCLS_MEMALLOC_MALLOC_IMPL> cyg_memalloc_mallocpool
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97 CYGBLD_ATTRIB_INIT_BEFORE( CYG_INIT_LIBC ) =
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98 Cyg_Mempool_Joined<CYGCLS_MEMALLOC_MALLOC_IMPL>(
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99 CYGMEM_HEAP_COUNT, cygmem_memalloc_heaps
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100 );
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101
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102 # define POOL cyg_memalloc_mallocpool
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103
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104 #endif
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105
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106 // FUNCTIONS
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107
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108 void *
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109 malloc( size_t size )
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110 {
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111 void *data_ptr;
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112
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113 CYG_REPORT_FUNCNAMETYPE( "malloc", "returning pointer %08x" );
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114
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115 CYG_REPORT_FUNCARG1DV( size );
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116
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117 #ifdef CYGSEM_MEMALLOC_MALLOC_ZERO_RETURNS_NULL
115
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118 // first check if size wanted is 0
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119 if ( 0 == size ) {
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120 CYG_REPORT_RETVAL( NULL );
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121 return NULL;
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122 } // if
138
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123 #endif
115
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124
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125 // ask the pool for the data
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126 data_ptr = POOL.try_alloc( size );
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127
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128 // if it isn't NULL is the pointer valid?
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129 if ( NULL != data_ptr ) {
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130 CYG_CHECK_DATA_PTR( data_ptr,
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131 "allocator returned invalid pointer!" );
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132
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133 // And just check its alignment
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134 CYG_ASSERT( !((CYG_ADDRWORD)data_ptr & (sizeof(CYG_ADDRWORD) - 1)),
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135 "Allocator has returned badly aligned data!");
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136 } // if
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137
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138 CYG_REPORT_RETVAL( data_ptr );
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139
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140 return data_ptr;
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141 } // malloc()
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142
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143
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144 void
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145 free( void *ptr )
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146 {
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147 cyg_bool freeret;
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148
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149 CYG_REPORT_FUNCNAME( "free");
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150
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151 CYG_REPORT_FUNCARG1XV( ptr );
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152
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153 // if null pointer, do nothing as per spec
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154 if ( NULL==ptr )
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155 return;
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156
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157 CYG_CHECK_DATA_PTR( ptr, "Pointer to free isn't even valid!" );
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158
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159 // get pool to free it
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160 freeret = POOL.free( (cyg_uint8 *) ptr );
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161
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162 CYG_ASSERT( freeret , "Couldn't free!" );
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163
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164 CYG_REPORT_RETURN();
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165
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166 } // free()
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167
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168
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169 void *
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170 calloc( size_t nmemb, size_t size )
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171 {
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172 void *data_ptr;
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173 cyg_ucount32 realsize;
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174
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175 CYG_REPORT_FUNCNAMETYPE( "calloc", "returning pointer %08x" );
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176
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177 CYG_REPORT_FUNCARG2DV( nmemb, size );
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178
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179 realsize = nmemb * size;
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180
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181 data_ptr = malloc( realsize );
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182
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183 // Fill with 0's if non-NULL
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184 if ( data_ptr != NULL )
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185 memset( data_ptr, 0, realsize );
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186
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187 CYG_REPORT_RETVAL( data_ptr );
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188 return data_ptr;
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189 } // calloc()
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190
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191
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192 externC void *
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193 realloc( void *ptr, size_t size )
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194 {
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195 cyg_int32 oldsize;
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196
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197 CYG_REPORT_FUNCNAMETYPE( "realloc", "returning pointer %08x" );
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198
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199 CYG_REPORT_FUNCARG2( "ptr=%08x, size=%d", ptr, size );
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200
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201 // if pointer is NULL, we must malloc it
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202 if ( ptr == NULL ) {
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203 ptr = malloc( size );
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204 CYG_REPORT_RETVAL( ptr );
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205 return ptr;
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206 } // if
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207
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208 CYG_CHECK_DATA_PTR( ptr, "realloc() passed a bogus pointer!" );
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209
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210 // if size is 0, we must free it
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211 if (size == 0) {
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212 free(ptr);
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213 CYG_REPORT_RETVAL( NULL );
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214 return NULL;
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215 } // if
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216
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217 void *newptr;
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218
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219 // otherwise try to resize allocation
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220 newptr = POOL.resize_alloc( (cyg_uint8 *)ptr, size, &oldsize );
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221
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222 if ( NULL == newptr ) {
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223 // if resize_alloc doesn't return a pointer, it failed, so we
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224 // just have to allocate new space instead, and later copy it
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225
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226 CYG_ASSERT( oldsize != 0,
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227 "resize_alloc() couldn't determine allocation size!" );
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228
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229 newptr = malloc( size );
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230
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231 if ( NULL != newptr ) {
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232 memcpy( newptr, ptr, size < (size_t) oldsize ? size
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233 : (size_t) oldsize );
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234 free( ptr );
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235 }
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236 }
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237
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238 CYG_REPORT_RETVAL( newptr );
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239 return newptr;
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240 } // realloc()
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241
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242
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243 externC struct mallinfo
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244 mallinfo( void )
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245 {
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246 struct mallinfo ret = { 0 }; // initialize to all zeros
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247 Cyg_Mempool_Status stat;
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248
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249 CYG_REPORT_FUNCTION();
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250
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251 POOL.get_status( CYG_MEMPOOL_STAT_ARENASIZE|
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252 CYG_MEMPOOL_STAT_FREEBLOCKS|
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253 CYG_MEMPOOL_STAT_TOTALALLOCATED|
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254 CYG_MEMPOOL_STAT_TOTALFREE|
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255 CYG_MEMPOOL_STAT_MAXFREE, stat );
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256
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257 if ( stat.arenasize > 0 )
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258 ret.arena = stat.arenasize;
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259
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260 if ( stat.freeblocks > 0 )
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261 ret.ordblks = stat.freeblocks;
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262
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263 if ( stat.totalallocated > 0 )
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264 ret.uordblks = stat.totalallocated;
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265
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266 if ( stat.totalfree > 0 )
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267 ret.fordblks = stat.totalfree;
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268
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269 if ( stat.maxfree > 0 )
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270 ret.maxfree = stat.maxfree;
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271
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272 CYG_REPORT_RETURN();
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273 return ret;
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274 } // mallinfo()
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275
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276 #endif // ifdef CYGPKG_MEMALLOC_MALLOC_ALLOCATORS
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277
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278 // EOF malloc.cxx