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<h1>lua/lmem.c</h1><a href="lmem_8c.html">Go to the documentation of this file.</a><div class="fragment"><pre class="fragment"><a name="l00001"></a>00001 <span class="comment">/*</span>
<a name="l00002"></a>00002 <span class="comment">** $Id: lmem.c,v 1.1 2004/03/16 21:58:30 niemeyer Exp $</span>
<a name="l00003"></a>00003 <span class="comment">** Interface to Memory Manager</span>
<a name="l00004"></a>00004 <span class="comment">** See Copyright Notice in lua.h</span>
<a name="l00005"></a>00005 <span class="comment">*/</span>
<a name="l00006"></a>00006 
<a name="l00007"></a>00007 
<a name="l00008"></a>00008 <span class="preprocessor">#include &lt;stdlib.h&gt;</span>
<a name="l00009"></a>00009 
<a name="l00010"></a><a class="code" href="lmem_8c.html#db2b6ef72119096fe9a546091881ab11">00010</a> <span class="preprocessor">#define lmem_c</span>
<a name="l00011"></a>00011 <span class="preprocessor"></span>
<a name="l00012"></a>00012 <span class="preprocessor">#include "lua.h"</span>
<a name="l00013"></a>00013 
<a name="l00014"></a>00014 <span class="preprocessor">#include "<a class="code" href="ldebug_8h.html">ldebug.h</a>"</span>
<a name="l00015"></a>00015 <span class="preprocessor">#include "<a class="code" href="ldo_8h.html">ldo.h</a>"</span>
<a name="l00016"></a>00016 <span class="preprocessor">#include "<a class="code" href="lmem_8h.html">lmem.h</a>"</span>
<a name="l00017"></a>00017 <span class="preprocessor">#include "<a class="code" href="lobject_8h.html">lobject.h</a>"</span>
<a name="l00018"></a>00018 <span class="preprocessor">#include "<a class="code" href="lstate_8h.html">lstate.h</a>"</span>
<a name="l00019"></a>00019 
<a name="l00020"></a>00020 
<a name="l00021"></a>00021 
<a name="l00022"></a>00022 <span class="comment">/*</span>
<a name="l00023"></a>00023 <span class="comment">** definition for realloc function. It must assure that l_realloc(NULL,</span>
<a name="l00024"></a>00024 <span class="comment">** 0, x) allocates a new block (ANSI C assures that). (`os' is the old</span>
<a name="l00025"></a>00025 <span class="comment">** block size; some allocators may use that.)</span>
<a name="l00026"></a>00026 <span class="comment">*/</span>
<a name="l00027"></a>00027 <span class="preprocessor">#ifndef l_realloc</span>
<a name="l00028"></a><a class="code" href="lmem_8c.html#465d3b97c250bdc5e2294eaf23cb64fb">00028</a> <span class="preprocessor"></span><span class="preprocessor">#define l_realloc(b,os,s)       realloc(b,s)</span>
<a name="l00029"></a>00029 <span class="preprocessor"></span><span class="preprocessor">#endif</span>
<a name="l00030"></a>00030 <span class="preprocessor"></span>
<a name="l00031"></a>00031 <span class="comment">/*</span>
<a name="l00032"></a>00032 <span class="comment">** definition for free function. (`os' is the old block size; some</span>
<a name="l00033"></a>00033 <span class="comment">** allocators may use that.)</span>
<a name="l00034"></a>00034 <span class="comment">*/</span>
<a name="l00035"></a>00035 <span class="preprocessor">#ifndef l_free</span>
<a name="l00036"></a><a class="code" href="lmem_8c.html#378c091da947b912c59f54ffbd644deb">00036</a> <span class="preprocessor"></span><span class="preprocessor">#define l_free(b,os)    free(b)</span>
<a name="l00037"></a>00037 <span class="preprocessor"></span><span class="preprocessor">#endif</span>
<a name="l00038"></a>00038 <span class="preprocessor"></span>
<a name="l00039"></a>00039 
<a name="l00040"></a><a class="code" href="lmem_8c.html#d0c497dab6f56823e95b1e5e0c4b35a8">00040</a> <span class="preprocessor">#define MINSIZEARRAY    4</span>
<a name="l00041"></a>00041 <span class="preprocessor"></span>
<a name="l00042"></a>00042 
<a name="l00043"></a><a class="code" href="lmem_8h.html#9b178ce1888a7eaaef7286727a7016fc">00043</a> <span class="keywordtype">void</span> *<a class="code" href="lmem_8c.html#00687a804d1b56fbfebf780e29f0d5fd">luaM_growaux</a> (<a class="code" href="structlua__State.html">lua_State</a> *L, <span class="keywordtype">void</span> *<a class="code" href="lparser_8c.html#235428bed4c6be6cb6d2760cd0fa9d34">block</a>, <span class="keywordtype">int</span> *size, <span class="keywordtype">int</span> size_elems,
<a name="l00044"></a>00044                     <span class="keywordtype">int</span> limit, <span class="keyword">const</span> <span class="keywordtype">char</span> *errormsg) {
<a name="l00045"></a>00045   <span class="keywordtype">void</span> *newblock;
<a name="l00046"></a>00046   <span class="keywordtype">int</span> newsize = (*size)*2;
<a name="l00047"></a>00047   <span class="keywordflow">if</span> (newsize &lt; <a class="code" href="lmem_8c.html#d0c497dab6f56823e95b1e5e0c4b35a8">MINSIZEARRAY</a>)
<a name="l00048"></a>00048     newsize = <a class="code" href="lmem_8c.html#d0c497dab6f56823e95b1e5e0c4b35a8">MINSIZEARRAY</a>;  <span class="comment">/* minimum size */</span>
<a name="l00049"></a>00049   <span class="keywordflow">else</span> <span class="keywordflow">if</span> (*size &gt;= limit/2) {  <span class="comment">/* cannot double it? */</span>
<a name="l00050"></a>00050     <span class="keywordflow">if</span> (*size &lt; limit - <a class="code" href="lmem_8c.html#d0c497dab6f56823e95b1e5e0c4b35a8">MINSIZEARRAY</a>)  <span class="comment">/* try something smaller... */</span>
<a name="l00051"></a>00051       newsize = limit;  <span class="comment">/* still have at least MINSIZEARRAY free places */</span>
<a name="l00052"></a>00052     <span class="keywordflow">else</span> <a class="code" href="ldebug_8c.html#5ef43f05a00bde7ee94539f3d765789c">luaG_runerror</a>(L, errormsg);
<a name="l00053"></a>00053   }
<a name="l00054"></a>00054   newblock = <a class="code" href="lmem_8c.html#79d69c472f8b846b962340beff43fc77">luaM_realloc</a>(L, block,
<a name="l00055"></a>00055                           <a class="code" href="llimits_8h.html#f17d62ec9e237a7644de6b9b34a48a34">cast</a>(<a class="code" href="llimits_8h.html#ac8c50ca0aa51c80523376da77c2c4d8">lu_mem</a>, *size)*<a class="code" href="llimits_8h.html#f17d62ec9e237a7644de6b9b34a48a34">cast</a>(<a class="code" href="llimits_8h.html#ac8c50ca0aa51c80523376da77c2c4d8">lu_mem</a>, size_elems),
<a name="l00056"></a>00056                           <a class="code" href="llimits_8h.html#f17d62ec9e237a7644de6b9b34a48a34">cast</a>(lu_mem, newsize)*<a class="code" href="llimits_8h.html#f17d62ec9e237a7644de6b9b34a48a34">cast</a>(lu_mem, size_elems));
<a name="l00057"></a>00057   *size = newsize;  <span class="comment">/* update only when everything else is OK */</span>
<a name="l00058"></a>00058   <span class="keywordflow">return</span> newblock;
<a name="l00059"></a>00059 }
<a name="l00060"></a>00060 
<a name="l00061"></a>00061 
<a name="l00062"></a>00062 <span class="comment">/*</span>
<a name="l00063"></a>00063 <span class="comment">** generic allocation routine.</span>
<a name="l00064"></a>00064 <span class="comment">*/</span>
<a name="l00065"></a><a class="code" href="lmem_8h.html#f844b131d162897e03b6ff517aaa225a">00065</a> <span class="keywordtype">void</span> *<a class="code" href="lmem_8c.html#79d69c472f8b846b962340beff43fc77">luaM_realloc</a> (<a class="code" href="structlua__State.html">lua_State</a> *L, <span class="keywordtype">void</span> *<a class="code" href="lparser_8c.html#235428bed4c6be6cb6d2760cd0fa9d34">block</a>, <a class="code" href="llimits_8h.html#ac8c50ca0aa51c80523376da77c2c4d8">lu_mem</a> oldsize, <a class="code" href="llimits_8h.html#ac8c50ca0aa51c80523376da77c2c4d8">lu_mem</a> size) {
<a name="l00066"></a>00066   <a class="code" href="llimits_8h.html#5978f5fda715bd80e845df1e16ad7780">lua_assert</a>((oldsize == 0) == (block == NULL));
<a name="l00067"></a>00067   <span class="keywordflow">if</span> (size == 0) {
<a name="l00068"></a>00068     <span class="keywordflow">if</span> (block != NULL) {
<a name="l00069"></a>00069       <a class="code" href="lmem_8c.html#378c091da947b912c59f54ffbd644deb">l_free</a>(block, oldsize);
<a name="l00070"></a>00070       block = NULL;
<a name="l00071"></a>00071     }
<a name="l00072"></a>00072     <span class="keywordflow">else</span> <span class="keywordflow">return</span> NULL;  <span class="comment">/* avoid `nblocks' computations when oldsize==size==0 */</span>
<a name="l00073"></a>00073   }
<a name="l00074"></a>00074   <span class="keywordflow">else</span> <span class="keywordflow">if</span> (size &gt;= <a class="code" href="llimits_8h.html#a927c7bf177c162feda3483e1e972b3a">MAX_SIZET</a>)
<a name="l00075"></a>00075     <a class="code" href="ldebug_8c.html#5ef43f05a00bde7ee94539f3d765789c">luaG_runerror</a>(L, <span class="stringliteral">"memory allocation error: block too big"</span>);
<a name="l00076"></a>00076   <span class="keywordflow">else</span> {
<a name="l00077"></a>00077     block = <a class="code" href="lmem_8c.html#465d3b97c250bdc5e2294eaf23cb64fb">l_realloc</a>(block, oldsize, size);
<a name="l00078"></a>00078     <span class="keywordflow">if</span> (block == NULL) {
<a name="l00079"></a>00079       <span class="keywordflow">if</span> (L)
<a name="l00080"></a>00080         <a class="code" href="ldo_8c.html#97706fc4752c2b3ea1ea23ae2b9e2d9a">luaD_throw</a>(L, LUA_ERRMEM);
<a name="l00081"></a>00081       <span class="keywordflow">else</span> <span class="keywordflow">return</span> NULL;  <span class="comment">/* error before creating state! */</span>
<a name="l00082"></a>00082     }
<a name="l00083"></a>00083   }
<a name="l00084"></a>00084   <span class="keywordflow">if</span> (L) {
<a name="l00085"></a>00085     <a class="code" href="llimits_8h.html#5978f5fda715bd80e845df1e16ad7780">lua_assert</a>(<a class="code" href="lstate_8h.html#103db2de6edf3420c6c6c9a282562406">G</a>(L) != NULL &amp;&amp; <a class="code" href="lstate_8h.html#103db2de6edf3420c6c6c9a282562406">G</a>(L)-&gt;nblocks &gt; 0);
<a name="l00086"></a>00086     <a class="code" href="lstate_8h.html#103db2de6edf3420c6c6c9a282562406">G</a>(L)-&gt;nblocks -= oldsize;
<a name="l00087"></a>00087     <a class="code" href="lstate_8h.html#103db2de6edf3420c6c6c9a282562406">G</a>(L)-&gt;nblocks += size;
<a name="l00088"></a>00088   }
<a name="l00089"></a>00089   <span class="keywordflow">return</span> block;
<a name="l00090"></a>00090 }
<a name="l00091"></a>00091 
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