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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 ANSI standard 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 Cygnus eCos Public License |
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12 // Version 1.0 (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://sourceware.cygnus.com/ecos |
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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 Cygnus Operating System, released |
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22 // September 30, 1998. |
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23 // |
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24 // The Initial Developer of the Original Code is Cygnus. Portions created |
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25 // by Cygnus are Copyright (C) 1998 Cygnus Solutions. All Rights Reserved. |
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26 // ------------------------------------------- |
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27 // |
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28 //####COPYRIGHTEND#### |
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29 //======================================================================== |
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30 //#####DESCRIPTIONBEGIN#### |
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31 // |
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32 // Author(s): jlarmour@cygnus.co.uk |
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33 // Contributors: jlarmour@cygnus.co.uk |
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34 // Date: 1998-02-13 |
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35 // Purpose: |
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36 // Description: Implementation of ANSI standard allocation routines as per |
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37 // ANSI section 7.10.3 |
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38 // Usage: |
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39 // |
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40 //####DESCRIPTIONEND#### |
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41 // |
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42 //======================================================================== |
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43 |
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44 // CONFIGURATION |
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45 |
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46 #include <pkgconf/libc.h> // Configuration header |
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47 |
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48 // Include the C library? |
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49 #ifdef CYGPKG_LIBC |
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50 |
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51 // And do we want these functions? |
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52 #ifdef CYGPKG_LIBC_MALLOC |
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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 memcpy() |
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60 #include <stdlib.h> // header for this file |
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61 #include <cyg/kernel/memvar.hxx> // Kernel variable size block allocator |
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62 |
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63 #include "clibincl/stdlibsupp.hxx" // Additional support for stdlib stuff |
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64 // internal to the C library |
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65 |
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66 // EXPORTED SYMBOLS |
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67 |
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68 externC void * |
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69 calloc( size_t, size_t ) CYGPRI_LIBC_WEAK_ALIAS("_calloc"); |
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70 |
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71 externC void |
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72 free( void * ) CYGPRI_LIBC_WEAK_ALIAS("_free"); |
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73 |
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74 externC void * |
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75 malloc( size_t ) CYGPRI_LIBC_WEAK_ALIAS("_malloc"); |
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76 |
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77 externC void * |
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78 realloc( void *, size_t ) CYGPRI_LIBC_WEAK_ALIAS("_realloc"); |
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79 |
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80 |
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81 // STATIC VARIABLES |
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82 |
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83 // the data space for the memory pool |
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84 static cyg_uint8 pooldata[ CYGNUM_LIBC_MALLOC_MEMPOOL_SIZE ]; |
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85 |
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86 // the memory pool object itself |
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87 static Cyg_Mempool_Variable pool CYG_INIT_PRIORITY( LIBC ) = |
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88 Cyg_Mempool_Variable( pooldata, CYGNUM_LIBC_MALLOC_MEMPOOL_SIZE ); |
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89 |
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90 |
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91 // FUNCTIONS |
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92 |
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93 void * |
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94 _malloc( size_t size ) |
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95 { |
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96 void *data_ptr; |
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97 |
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98 CYG_REPORT_FUNCNAMETYPE( "_malloc", "returning pointer %08x" ); |
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99 |
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100 CYG_REPORT_FUNCARG1DV( size ); |
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101 |
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102 // first check if size wanted is 0 |
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103 if (!size) { |
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104 CYG_REPORT_RETVAL( NULL ); |
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105 return NULL; |
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106 } // if |
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107 |
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108 // ask the pool for the data |
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109 data_ptr = pool.try_alloc( size ); |
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110 |
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111 // if it isn't NULL is the pointer valid? |
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112 if (data_ptr != NULL) { |
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113 CYG_CHECK_DATA_PTR( data_ptr, |
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114 "allocator returned invalid pointer!" ); |
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115 |
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116 // And just check its alignment |
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117 CYG_ASSERT( !((CYG_ADDRWORD)data_ptr & (sizeof(CYG_ADDRWORD) - 1)), |
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118 "Allocator has returned badly aligned data!"); |
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119 } // if |
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120 |
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121 CYG_REPORT_RETVAL( data_ptr ); |
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122 |
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123 return data_ptr; |
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124 } // _malloc() |
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125 |
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126 |
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127 void |
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128 _free( void *ptr ) |
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129 { |
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130 CYG_REPORT_FUNCNAME( "_free"); |
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131 |
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132 CYG_REPORT_FUNCARG1XV( ptr ); |
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133 |
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134 // if null pointer, do nothing as per spec |
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135 if (ptr==NULL) |
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136 return; |
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137 |
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138 CYG_CHECK_DATA_PTR( ptr, "Pointer to free isn't even valid!" ); |
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139 |
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140 // get pool to free it. Use size==0 for pool to determine the size |
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141 // Also ignore return value - there's nothing we can do with it |
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142 pool.free( (cyg_uint8 *) ptr, 0 ); |
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143 |
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144 CYG_REPORT_RETURN(); |
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145 |
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146 } // _free() |
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147 |
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148 |
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149 void * |
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150 _calloc( size_t nmemb, size_t size ) |
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151 { |
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152 void *data_ptr; |
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153 cyg_ucount32 realsize; |
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154 |
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155 CYG_REPORT_FUNCNAMETYPE( "_calloc", "returning pointer %08x" ); |
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156 |
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157 CYG_REPORT_FUNCARG2DV( nmemb, size ); |
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158 |
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159 realsize = nmemb * size; |
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160 |
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161 data_ptr = _malloc( realsize ); |
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162 |
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163 // Fill with 0's if non-NULL |
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164 if (data_ptr != NULL) |
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165 memset( data_ptr, 0, realsize ); |
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166 |
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167 CYG_REPORT_RETVAL( data_ptr ); |
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168 return data_ptr; |
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169 } // _calloc() |
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170 |
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171 |
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172 externC void * |
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173 _realloc( void *ptr, size_t size ) |
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174 { |
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175 void *ret_ptr; |
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176 cyg_int32 oldsize; |
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177 |
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178 CYG_REPORT_FUNCNAMETYPE( "_realloc", "returning pointer %08x" ); |
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179 |
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180 CYG_REPORT_FUNCARG2( "ptr=%08x, size=%d", ptr, size ); |
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181 |
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182 // if pointer is NULL, we must malloc it |
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183 if (ptr == NULL) { |
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184 ret_ptr = _malloc( size ); |
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185 CYG_REPORT_RETVAL( ret_ptr ); |
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186 return ret_ptr; |
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187 } // if |
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188 |
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189 CYG_CHECK_DATA_PTR( ptr, "_realloc() passed a bogus pointer!" ); |
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190 |
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191 // if size is 0, we must free it |
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192 if (size == 0) { |
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193 _free(ptr); |
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194 CYG_REPORT_RETVAL( NULL ); |
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195 return NULL; |
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196 } // if |
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197 |
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198 |
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199 oldsize = pool.get_allocation_size( (cyg_uint8 *)ptr ); |
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200 |
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201 CYG_ASSERT( oldsize != -1, |
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202 "_realloc() couldn't find allocation size!" ); |
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203 |
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204 ret_ptr = _malloc( size ); |
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205 |
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206 // as long as malloc succeeded |
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207 if (ret_ptr != NULL) { |
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208 // copy old contents |
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209 memcpy( ret_ptr, ptr, size < (size_t) oldsize ? size |
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210 : (size_t) oldsize ); |
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211 |
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212 _free(ptr); |
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213 } // if |
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214 |
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215 CYG_REPORT_RETVAL( ret_ptr ); |
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216 return ret_ptr; |
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217 } // _realloc() |
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218 |
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219 #endif // ifdef CYGPKG_LIBC_MALLOC |
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220 |
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221 #endif // ifdef CYGPKG_LIBC |
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222 |
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223 // EOF malloc.cxx |
