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authorneodarz <neodarz@neodarz.net>2018-08-11 20:21:34 +0200
committerneodarz <neodarz@neodarz.net>2018-08-11 20:21:34 +0200
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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 &amp;&amp; align!=8 &amp;&amp; align!=16 &amp;&amp; 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) &amp; (~(<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 &amp;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 &amp;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)) &amp; (~(<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 &gt;= 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-&gt;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 &gt; 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-&gt;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 &gt;= 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-&gt;second.Ptr &gt;= (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-&gt;second.Ptr + itPrevious-&gt;second.Size &lt;= (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-&gt;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-&gt;second.Ptr + itPrevious-&gt;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-&gt;second.Ptr;
+00256 newSpace.Size= itPrevious-&gt;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-&gt;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-&gt;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-&gt;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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