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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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