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<hr><h1>heap_memory.cpp</h1><a href="heap__memory_8cpp.html">Go to the documentation of this file.</a><div class="fragment"><pre>00001
00007 <font class="comment">/* Copyright, 2001 Nevrax Ltd.</font>
00008 <font class="comment"> *</font>
00009 <font class="comment"> * This file is part of NEVRAX NEL.</font>
00010 <font class="comment"> * NEVRAX NEL is free software; you can redistribute it and/or modify</font>
00011 <font class="comment"> * it under the terms of the GNU General Public License as published by</font>
00012 <font class="comment"> * the Free Software Foundation; either version 2, or (at your option)</font>
00013 <font class="comment"> * any later version.</font>
00014 <font class="comment"></font>
00015 <font class="comment"> * NEVRAX NEL is distributed in the hope that it will be useful, but</font>
00016 <font class="comment"> * WITHOUT ANY WARRANTY; without even the implied warranty of</font>
00017 <font class="comment"> * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU</font>
00018 <font class="comment"> * General Public License for more details.</font>
00019 <font class="comment"></font>
00020 <font class="comment"> * You should have received a copy of the GNU General Public License</font>
00021 <font class="comment"> * along with NEVRAX NEL; see the file COPYING. If not, write to the</font>
00022 <font class="comment"> * Free Software Foundation, Inc., 59 Temple Place - Suite 330, Boston,</font>
00023 <font class="comment"> * MA 02111-1307, USA.</font>
00024 <font class="comment"> */</font>
00025
00026 <font class="preprocessor">#include "<a class="code" href="stdmisc_8h.html">stdmisc.h</a>"</font>
00027
00028 <font class="preprocessor">#include "<a class="code" href="heap__memory_8h.html">nel/misc/heap_memory.h</a>"</font>
00029
00030 <font class="keyword">using</font> <font class="keyword">namespace </font>std;
00031
00032
00033 <font class="keyword">namespace </font>NLMISC
00034 {
00035
00036
00037 <font class="comment">// ***************************************************************************</font>
<a name="l00038"></a><a class="code" href="classNLMISC_1_1CHeapMemory.html#a0">00038</a> CHeapMemory::CHeapMemory()
00039 {
00040 <a class="code" href="classNLMISC_1_1CHeapMemory.html#a2">reset</a>();
00041 <font class="comment">// For allocate to work even if the heap is not initialized.</font>
00042 <a class="code" href="classNLMISC_1_1CHeapMemory.html#o3">_Alignment</a>= 4;
00043 }
00044 <font class="comment">// ***************************************************************************</font>
<a name="l00045"></a><a class="code" href="classNLMISC_1_1CHeapMemory.html#a1">00045</a> CHeapMemory::~CHeapMemory()
00046 {
00047 <a class="code" href="classNLMISC_1_1CHeapMemory.html#a2">reset</a>();
00048 }
00049
00050
00051 <font class="comment">// ***************************************************************************</font>
<a name="l00052"></a><a class="code" href="classNLMISC_1_1CHeapMemory.html#a2">00052</a> <font class="keywordtype">void</font> CHeapMemory::reset()
00053 {
00054 <a class="code" href="classNLMISC_1_1CHeapMemory.html#o4">_EmptySpaces</a>.clear();
00055 <a class="code" href="classNLMISC_1_1CHeapMemory.html#o5">_EmptySpaceMap</a>.clear();
00056 <a class="code" href="classNLMISC_1_1CHeapMemory.html#o6">_AllocatedSpaceMap</a>.clear();
00057 <a class="code" href="classNLMISC_1_1CHeapMemory.html#o0">_HeapPtr</a>= NULL;
00058 <a class="code" href="classNLMISC_1_1CHeapMemory.html#o1">_HeapSize</a>= 0;
00059 <a class="code" href="classNLMISC_1_1CHeapMemory.html#o2">_HeapSizeUsed</a>= 0;
00060 }
00061
00062
00063 <font class="comment">// ***************************************************************************</font>
<a name="l00064"></a><a class="code" href="classNLMISC_1_1CHeapMemory.html#a3">00064</a> <font class="keywordtype">void</font> CHeapMemory::initHeap(<font class="keywordtype">void</font> *heap, uint size, uint align)
00065 {
00066 <font class="comment">// setup alignement.</font>
00067 <font class="keywordflow">if</font>(align!=4 && align!=8 && align!=16 && align!=32)
00068 {
00069 <a class="code" href="debug_8h.html#a12">nlstop</a>;
00070 align= 4;
00071 }
00072 <a class="code" href="classNLMISC_1_1CHeapMemory.html#o3">_Alignment</a>= align;
00073
00074 <font class="comment">// Manage alignement.</font>
00075 size= (size) & (~(<a class="code" href="classNLMISC_1_1CHeapMemory.html#o3">_Alignment</a>-1));
00076
00077 <font class="comment">// clear container.</font>
00078 <a class="code" href="classNLMISC_1_1CHeapMemory.html#a2">reset</a>();
00079 <font class="keywordflow">if</font>(heap==0 || size==0)
00080 <font class="keywordflow">return</font>;
00081
00082 <a class="code" href="classNLMISC_1_1CHeapMemory.html#o0">_HeapPtr</a>= (uint8*)heap;
00083 <a class="code" href="classNLMISC_1_1CHeapMemory.html#o1">_HeapSize</a>= size;
00084 <a class="code" href="classNLMISC_1_1CHeapMemory.html#o2">_HeapSizeUsed</a>= 0;
00085
00086 <font class="comment">// Add the only one empty space.</font>
00087 CEmptySpace space;
00088 space.Ptr= <a class="code" href="classNLMISC_1_1CHeapMemory.html#o0">_HeapPtr</a>;
00089 space.Size= <a class="code" href="classNLMISC_1_1CHeapMemory.html#o1">_HeapSize</a>;
00090
00091 <a class="code" href="classNLMISC_1_1CHeapMemory.html#c1">addEmptySpace</a>(space);
00092 }
00093
00094
00095 <font class="comment">// ***************************************************************************</font>
<a name="l00096"></a><a class="code" href="classNLMISC_1_1CHeapMemory.html#c0">00096</a> <font class="keywordtype">void</font> CHeapMemory::removeEmptySpace(CEmptySpace &space)
00097 {
00098 <font class="comment">// remove the iterator on the spaceMap.</font>
00099 <a class="code" href="classNLMISC_1_1CHeapMemory.html#o5">_EmptySpaceMap</a>.erase( space.SizeIt );
00100
00101 <font class="comment">// remove from the list of EmptySpaces. NB: must fo it after all, because "space" may be deleted.</font>
00102 <a class="code" href="classNLMISC_1_1CHeapMemory.html#o4">_EmptySpaces</a>.erase( space.Ptr );
00103 }
00104
00105
00106 <font class="comment">// ***************************************************************************</font>
<a name="l00107"></a><a class="code" href="classNLMISC_1_1CHeapMemory.html#c1">00107</a> <font class="keywordtype">void</font> CHeapMemory::addEmptySpace(CEmptySpace &space)
00108 {
00109 <font class="comment">// insert and get the iterator on the spaceMap.</font>
00110 space.SizeIt= <a class="code" href="classNLMISC_1_1CHeapMemory.html#o5">_EmptySpaceMap</a>.insert( make_pair(space.Size, space.Ptr));
00111
00112 <font class="comment">// insert into the list of EmptySpaces.</font>
00113 <a class="code" href="classNLMISC_1_1CHeapMemory.html#o4">_EmptySpaces</a>.insert( make_pair(space.Ptr, space) );
00114 }
00115
00116
00117 <font class="comment">// ***************************************************************************</font>
<a name="l00118"></a><a class="code" href="classNLMISC_1_1CHeapMemory.html#a6">00118</a> <font class="keywordtype">void</font> *CHeapMemory::allocate(uint size)
00119 {
00120 <font class="keywordflow">if</font>(size==0)
00121 <font class="keywordflow">return</font> NULL;
00122
00123 <font class="comment">// Manage alignement.</font>
00124 size= (size + (<a class="code" href="classNLMISC_1_1CHeapMemory.html#o3">_Alignment</a>-1)) & (~(<a class="code" href="classNLMISC_1_1CHeapMemory.html#o3">_Alignment</a>-1));
00125
00126
00127 <font class="comment">// retrieve the best block.</font>
00128 <font class="comment">//=========================</font>
00129 CEmptySpace bestSpace;
00130 <font class="comment">// NB: do a copy, because of removeEmptySpace() which delete the space.</font>
00131
00132 <font class="comment">// Find the smaller space which is >= than size.</font>
00133 <a class="code" href="classNLMISC_1_1CHeapMemory.html#u1">ItEmptySpaceSizeMap</a> it;
00134 it= <a class="code" href="classNLMISC_1_1CHeapMemory.html#o5">_EmptySpaceMap</a>.lower_bound(size);
00135
00136 <font class="comment">// if not found, alloc fails.</font>
00137 <font class="keywordflow">if</font>(it == <a class="code" href="classNLMISC_1_1CHeapMemory.html#o5">_EmptySpaceMap</a>.end())
00138 <font class="keywordflow">return</font> NULL;
00139 <font class="keywordflow">else</font>
00140 {
00141 <font class="comment">// NB: this space must exist in the "array".</font>
00142 bestSpace= <a class="code" href="classNLMISC_1_1CHeapMemory.html#o4">_EmptySpaces</a>[it->second];
00143 }
00144
00145
00146 <font class="comment">// remove this empty space from list.</font>
00147 <font class="comment">//=========================</font>
00148 <a class="code" href="classNLMISC_1_1CHeapMemory.html#c0">removeEmptySpace</a>(bestSpace);
00149
00150
00151 <font class="comment">// if any, add the space unused to the list.</font>
00152 <font class="comment">//=========================</font>
00153 <font class="keywordflow">if</font>(bestSpace.Size > size)
00154 {
00155 CEmptySpace space;
00156 space.Ptr= bestSpace.Ptr + size;
00157 space.Size= bestSpace.Size - size;
00158
00159 <a class="code" href="classNLMISC_1_1CHeapMemory.html#c1">addEmptySpace</a>(space);
00160 }
00161
00162
00163 <font class="comment">// return / insert the allocated space.</font>
00164 <font class="comment">//=========================</font>
00165 <a class="code" href="classNLMISC_1_1CHeapMemory.html#o6">_AllocatedSpaceMap</a>.insert(make_pair(bestSpace.Ptr, size));
00166 <a class="code" href="classNLMISC_1_1CHeapMemory.html#o2">_HeapSizeUsed</a>+= size;
00167
00168 <font class="comment">// return the ptr of start of this empty space.</font>
00169 <font class="keywordflow">return</font> bestSpace.Ptr;
00170 }
00171
00172 <font class="comment">// ***************************************************************************</font>
<a name="l00173"></a><a class="code" href="classNLMISC_1_1CHeapMemory.html#a7">00173</a> <font class="keywordtype">void</font> CHeapMemory::free(<font class="keywordtype">void</font> *ptr)
00174 {
00175 <font class="keywordflow">if</font>(ptr==NULL)
00176 <font class="keywordflow">return</font>;
00177
00178 <font class="comment">// Must find the array in allocated spaces.</font>
00179 <font class="comment">//==========================</font>
00180 <a class="code" href="classNLMISC_1_1CHeapMemory.html#u5">ItAllocatedSpaceMap</a> itAlloc= <a class="code" href="classNLMISC_1_1CHeapMemory.html#o6">_AllocatedSpaceMap</a>.find((uint8*)ptr);
00181 <font class="keywordflow">if</font>(itAlloc == <a class="code" href="classNLMISC_1_1CHeapMemory.html#o6">_AllocatedSpaceMap</a>.end())
00182 {
00183 <a class="code" href="debug_8h.html#a12">nlstop</a>;
00184 <font class="keywordflow">return</font>;
00185 }
00186 uint size= itAlloc->second;
00187
00188 <font class="comment">// free this space from allocated Spaces.</font>
00189 <a class="code" href="classNLMISC_1_1CHeapMemory.html#o6">_AllocatedSpaceMap</a>.erase(itAlloc);
00190 <a class="code" href="classNLMISC_1_1CHeapMemory.html#o2">_HeapSizeUsed</a>-= size;
00191
00192
00193 <font class="comment">// Must find previous or/and next empty space, if any.</font>
00194 <font class="comment">//==========================</font>
00195 <a class="code" href="classNLMISC_1_1CHeapMemory.html#u3">ItEmptySpacePtrMap</a> itPrevious, itNext;
00196
00197 <font class="comment">// find the empty space which is immediately >= than ptr.</font>
00198 itNext= <a class="code" href="classNLMISC_1_1CHeapMemory.html#o4">_EmptySpaces</a>.lower_bound((uint8*)ptr);
00199 <font class="comment">// NB: it may be end(), if it is the last block (very rare).</font>
00200
00201 <font class="comment">// some check. next empty space ptr must be after ptr.</font>
00202 <font class="keywordflow">if</font>(itNext!=<a class="code" href="classNLMISC_1_1CHeapMemory.html#o4">_EmptySpaces</a>.end())
00203 {
00204 <a class="code" href="debug_8h.html#a6">nlassert</a>(itNext->second.Ptr >= (uint8*)ptr + size);
00205 }
00206
00207 <font class="comment">// if itNext is not the first empty space, there is an empty space before us.</font>
00208 <font class="keywordflow">if</font>( itNext!= <a class="code" href="classNLMISC_1_1CHeapMemory.html#o4">_EmptySpaces</a>.begin() )
00209 {
00210 <font class="comment">// NB: work even if itNext==end().</font>
00211 itPrevious= itNext;
00212 itPrevious--;
00213 <font class="comment">// some check. previous empty space ptr must be before ptr.</font>
00214 <a class="code" href="debug_8h.html#a6">nlassert</a>(itPrevious!=<a class="code" href="classNLMISC_1_1CHeapMemory.html#o4">_EmptySpaces</a>.end());
00215 <a class="code" href="debug_8h.html#a6">nlassert</a>(itPrevious->second.Ptr + itPrevious->second.Size <= (uint8*)ptr );
00216 }
00217 <font class="keywordflow">else</font>
00218 itPrevious= <a class="code" href="classNLMISC_1_1CHeapMemory.html#o4">_EmptySpaces</a>.end();
00219
00220
00221 <font class="comment">// if next exist.</font>
00222 <font class="keywordflow">if</font>(itNext!=<a class="code" href="classNLMISC_1_1CHeapMemory.html#o4">_EmptySpaces</a>.end())
00223 {
00224 <font class="comment">// If Previous is not just after allocated ptr, it means that there is some allocated blocks beetween,</font>
00225 <font class="comment">// so it is not a valid empty space to concat.</font>
00226 <font class="keywordflow">if</font>(itNext->second.Ptr != (uint8*)ptr + size)
00227 itNext= <a class="code" href="classNLMISC_1_1CHeapMemory.html#o4">_EmptySpaces</a>.end();
00228 }
00229 <font class="comment">// if previous exist.</font>
00230 <font class="keywordflow">if</font>(itPrevious!=<a class="code" href="classNLMISC_1_1CHeapMemory.html#o4">_EmptySpaces</a>.end())
00231 {
00232 <font class="comment">// If Previous is not just before allocated ptr, it means that there is some allocated blocks beetween,</font>
00233 <font class="comment">// so it is not a valid empty space to concat.</font>
00234 <font class="keywordflow">if</font>(itPrevious->second.Ptr + itPrevious->second.Size != (uint8*)ptr )
00235 itPrevious=<a class="code" href="classNLMISC_1_1CHeapMemory.html#o4">_EmptySpaces</a>.end();
00236 }
00237
00238
00239
00240 <font class="comment">// According to configuration, build the new empty space, mreging previous and next, and remove old ones.</font>
00241 <font class="comment">//==========================</font>
00242 CEmptySpace newSpace;
00243
00244 <font class="comment">// if no previous empty space, then newSpace start at ptr.</font>
00245 <font class="keywordflow">if</font>(itPrevious == <a class="code" href="classNLMISC_1_1CHeapMemory.html#o4">_EmptySpaces</a>.end())
00246 {
00247 <font class="comment">// Start with old allocated block.</font>
00248 newSpace.Ptr= (uint8*)ptr;
00249 newSpace.Size= size;
00250 }
00251 <font class="comment">// else, start at previous Ptr.</font>
00252 <font class="keywordflow">else</font>
00253 {
00254 <font class="comment">// Start with previous block. size is previous size + allocated block size.</font>
00255 newSpace.Ptr= itPrevious->second.Ptr;
00256 newSpace.Size= itPrevious->second.Size + size;
00257 }
00258
00259 <font class="comment">// if next empty space, must inc size.</font>
00260 <font class="keywordflow">if</font>(itNext != <a class="code" href="classNLMISC_1_1CHeapMemory.html#o4">_EmptySpaces</a>.end())
00261 {
00262 newSpace.Size+= itNext->second.Size;
00263 }
00264
00265
00266 <font class="comment">// remove old empty space, and add new one.</font>
00267 <font class="comment">//==========================</font>
00268
00269 <font class="comment">// remove old empty spaces.</font>
00270 <font class="keywordflow">if</font>(itPrevious != <a class="code" href="classNLMISC_1_1CHeapMemory.html#o4">_EmptySpaces</a>.end())
00271 <a class="code" href="classNLMISC_1_1CHeapMemory.html#c0">removeEmptySpace</a>(itPrevious->second);
00272 <font class="keywordflow">if</font>(itNext != <a class="code" href="classNLMISC_1_1CHeapMemory.html#o4">_EmptySpaces</a>.end())
00273 <a class="code" href="classNLMISC_1_1CHeapMemory.html#c0">removeEmptySpace</a>(itNext->second);
00274
00275
00276 <font class="comment">// Add the new concatenated empty space.</font>
00277 <a class="code" href="classNLMISC_1_1CHeapMemory.html#c1">addEmptySpace</a>(newSpace);
00278 }
00279
00280
00281
00282 } <font class="comment">// NLMISC</font>
</pre></div>
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