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<h1>lua/llimits.h</h1><a href="llimits_8h.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: llimits.h,v 1.1 2004/03/16 21:58:30 niemeyer Exp $</span>
<a name="l00003"></a>00003 <span class="comment">** Limits, basic types, and some other `installation-dependent' definitions</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 <span class="preprocessor">#ifndef llimits_h</span>
<a name="l00008"></a>00008 <span class="preprocessor"></span><span class="preprocessor">#define llimits_h</span>
<a name="l00009"></a>00009 <span class="preprocessor"></span>
<a name="l00010"></a>00010
<a name="l00011"></a>00011 <span class="preprocessor">#include <limits.h></span>
<a name="l00012"></a>00012 <span class="preprocessor">#include <stddef.h></span>
<a name="l00013"></a>00013
<a name="l00014"></a>00014
<a name="l00015"></a>00015 <span class="preprocessor">#include "lua.h"</span>
<a name="l00016"></a>00016
<a name="l00017"></a>00017
<a name="l00018"></a>00018 <span class="comment">/*</span>
<a name="l00019"></a>00019 <span class="comment">** try to find number of bits in an integer</span>
<a name="l00020"></a>00020 <span class="comment">*/</span>
<a name="l00021"></a>00021 <span class="preprocessor">#ifndef BITS_INT</span>
<a name="l00022"></a>00022 <span class="preprocessor"></span><span class="comment">/* avoid overflows in comparison */</span>
<a name="l00023"></a>00023 <span class="preprocessor">#if INT_MAX-20 < 32760</span>
<a name="l00024"></a><a class="code" href="llimits_8h.html#2d0a9daa55e43de002b68492b154c037">00024</a> <span class="preprocessor"></span><span class="preprocessor">#define BITS_INT 16</span>
<a name="l00025"></a>00025 <span class="preprocessor"></span><span class="preprocessor">#else</span>
<a name="l00026"></a>00026 <span class="preprocessor"></span><span class="preprocessor">#if INT_MAX > 2147483640L</span>
<a name="l00027"></a>00027 <span class="preprocessor"></span><span class="comment">/* machine has at least 32 bits */</span>
<a name="l00028"></a>00028 <span class="preprocessor">#define BITS_INT 32</span>
<a name="l00029"></a>00029 <span class="preprocessor"></span><span class="preprocessor">#else</span>
<a name="l00030"></a>00030 <span class="preprocessor"></span><span class="preprocessor">#error "you must define BITS_INT with number of bits in an integer"</span>
<a name="l00031"></a>00031 <span class="preprocessor"></span><span class="preprocessor">#endif</span>
<a name="l00032"></a>00032 <span class="preprocessor"></span><span class="preprocessor">#endif</span>
<a name="l00033"></a>00033 <span class="preprocessor"></span><span class="preprocessor">#endif</span>
<a name="l00034"></a>00034 <span class="preprocessor"></span>
<a name="l00035"></a>00035
<a name="l00036"></a>00036 <span class="comment">/*</span>
<a name="l00037"></a>00037 <span class="comment">** the following types define integer types for values that may not</span>
<a name="l00038"></a>00038 <span class="comment">** fit in a `small int' (16 bits), but may waste space in a</span>
<a name="l00039"></a>00039 <span class="comment">** `large long' (64 bits). The current definitions should work in</span>
<a name="l00040"></a>00040 <span class="comment">** any machine, but may not be optimal.</span>
<a name="l00041"></a>00041 <span class="comment">*/</span>
<a name="l00042"></a>00042
<a name="l00043"></a>00043 <span class="comment">/* an unsigned integer to hold hash values */</span>
<a name="l00044"></a><a class="code" href="llimits_8h.html#6bd8ffeee8032212306017a8f3dda6c6">00044</a> <span class="keyword">typedef</span> <span class="keywordtype">unsigned</span> <span class="keywordtype">int</span> <a class="code" href="llimits_8h.html#6bd8ffeee8032212306017a8f3dda6c6">lu_hash</a>;
<a name="l00045"></a>00045 <span class="comment">/* its signed equivalent */</span>
<a name="l00046"></a><a class="code" href="llimits_8h.html#a188c2785599c093b2ebdefdc6abf074">00046</a> <span class="keyword">typedef</span> <span class="keywordtype">int</span> <a class="code" href="llimits_8h.html#a188c2785599c093b2ebdefdc6abf074">ls_hash</a>;
<a name="l00047"></a>00047
<a name="l00048"></a>00048 <span class="comment">/* an unsigned integer big enough to count the total memory used by Lua; */</span>
<a name="l00049"></a>00049 <span class="comment">/* it should be at least as large as size_t */</span>
<a name="l00050"></a><a class="code" href="llimits_8h.html#ac8c50ca0aa51c80523376da77c2c4d8">00050</a> <span class="keyword">typedef</span> <span class="keywordtype">unsigned</span> <span class="keywordtype">long</span> <a class="code" href="llimits_8h.html#ac8c50ca0aa51c80523376da77c2c4d8">lu_mem</a>;
<a name="l00051"></a>00051
<a name="l00052"></a><a class="code" href="llimits_8h.html#5e67dd5554c315bda4b54cd5ed0e846e">00052</a> <span class="preprocessor">#define MAX_LUMEM ULONG_MAX</span>
<a name="l00053"></a>00053 <span class="preprocessor"></span>
<a name="l00054"></a>00054
<a name="l00055"></a>00055 <span class="comment">/* an integer big enough to count the number of strings in use */</span>
<a name="l00056"></a><a class="code" href="llimits_8h.html#aec649ed31f1a3983453f89bc24ff89f">00056</a> <span class="keyword">typedef</span> <span class="keywordtype">long</span> <a class="code" href="llimits_8h.html#aec649ed31f1a3983453f89bc24ff89f">ls_nstr</a>;
<a name="l00057"></a>00057
<a name="l00058"></a>00058 <span class="comment">/* chars used as small naturals (so that `char' is reserved for characters) */</span>
<a name="l00059"></a><a class="code" href="llimits_8h.html#e1fe9ac10d9803bd1d7bdf30b18bad68">00059</a> <span class="keyword">typedef</span> <span class="keywordtype">unsigned</span> <span class="keywordtype">char</span> <a class="code" href="llimits_8h.html#e1fe9ac10d9803bd1d7bdf30b18bad68">lu_byte</a>;
<a name="l00060"></a>00060
<a name="l00061"></a>00061
<a name="l00062"></a><a class="code" href="llimits_8h.html#a927c7bf177c162feda3483e1e972b3a">00062</a> <span class="preprocessor">#define MAX_SIZET ((size_t)(~(size_t)0)-2)</span>
<a name="l00063"></a>00063 <span class="preprocessor"></span>
<a name="l00064"></a>00064
<a name="l00065"></a><a class="code" href="llimits_8h.html#aa1ac5caef84256eaeb39594e58e096f">00065</a> <span class="preprocessor">#define MAX_INT (INT_MAX-2) </span><span class="comment">/* maximum value of an int (-2 for safety) */</span>
<a name="l00066"></a>00066
<a name="l00067"></a>00067 <span class="comment">/*</span>
<a name="l00068"></a>00068 <span class="comment">** conversion of pointer to integer</span>
<a name="l00069"></a>00069 <span class="comment">** this is for hashing only; there is no problem if the integer</span>
<a name="l00070"></a>00070 <span class="comment">** cannot hold the whole pointer value</span>
<a name="l00071"></a>00071 <span class="comment">*/</span>
<a name="l00072"></a><a class="code" href="llimits_8h.html#8288659cbb646a713deb7a5a56c65c40">00072</a> <span class="preprocessor">#define IntPoint(p) ((lu_hash)(p))</span>
<a name="l00073"></a>00073 <span class="preprocessor"></span>
<a name="l00074"></a>00074
<a name="l00075"></a>00075
<a name="l00076"></a>00076 <span class="comment">/* type to ensure maximum alignment */</span>
<a name="l00077"></a>00077 <span class="preprocessor">#ifndef LUSER_ALIGNMENT_T</span>
<a name="l00078"></a><a class="code" href="unionL__Umaxalign.html#af4524b400b6ffa5e8398a4061fb4ce3">00078</a> <span class="preprocessor"></span><span class="keyword">typedef</span> <span class="keyword">union </span>{ <span class="keywordtype">double</span> u; <span class="keywordtype">void</span> *s; <span class="keywordtype">long</span> l; } <a class="code" href="unionL__Umaxalign.html">L_Umaxalign</a>;
<a name="l00079"></a>00079 <span class="preprocessor">#else</span>
<a name="l00080"></a>00080 <span class="preprocessor"></span><span class="keyword">typedef</span> LUSER_ALIGNMENT_T <a class="code" href="unionL__Umaxalign.html">L_Umaxalign</a>;
<a name="l00081"></a>00081 <span class="preprocessor">#endif</span>
<a name="l00082"></a>00082 <span class="preprocessor"></span>
<a name="l00083"></a>00083
<a name="l00084"></a>00084 <span class="comment">/* result of `usual argument conversion' over lua_Number */</span>
<a name="l00085"></a>00085 <span class="preprocessor">#ifndef LUA_UACNUMBER</span>
<a name="l00086"></a><a class="code" href="llimits_8h.html#aa2c720c373a681b2afb19dce9cfb235">00086</a> <span class="preprocessor"></span><span class="keyword">typedef</span> <span class="keywordtype">double</span> <a class="code" href="llimits_8h.html#aa2c720c373a681b2afb19dce9cfb235">l_uacNumber</a>;
<a name="l00087"></a>00087 <span class="preprocessor">#else</span>
<a name="l00088"></a>00088 <span class="preprocessor"></span><span class="keyword">typedef</span> LUA_UACNUMBER <a class="code" href="llimits_8h.html#aa2c720c373a681b2afb19dce9cfb235">l_uacNumber</a>;
<a name="l00089"></a>00089 <span class="preprocessor">#endif</span>
<a name="l00090"></a>00090 <span class="preprocessor"></span>
<a name="l00091"></a>00091
<a name="l00092"></a>00092 <span class="preprocessor">#ifndef lua_assert</span>
<a name="l00093"></a><a class="code" href="llimits_8h.html#5978f5fda715bd80e845df1e16ad7780">00093</a> <span class="preprocessor"></span><span class="preprocessor">#define lua_assert(c) </span><span class="comment">/* empty */</span>
<a name="l00094"></a>00094 <span class="preprocessor">#endif</span>
<a name="l00095"></a>00095 <span class="preprocessor"></span>
<a name="l00096"></a>00096
<a name="l00097"></a>00097 <span class="preprocessor">#ifndef check_exp</span>
<a name="l00098"></a><a class="code" href="llimits_8h.html#fac1404af62451f8653440ecb6e773fc">00098</a> <span class="preprocessor"></span><span class="preprocessor">#define check_exp(c,e) (e)</span>
<a name="l00099"></a>00099 <span class="preprocessor"></span><span class="preprocessor">#endif</span>
<a name="l00100"></a>00100 <span class="preprocessor"></span>
<a name="l00101"></a>00101
<a name="l00102"></a>00102 <span class="preprocessor">#ifndef UNUSED</span>
<a name="l00103"></a><a class="code" href="llimits_8h.html#86d500a34c624c2cae56bc25a31b12f3">00103</a> <span class="preprocessor"></span><span class="preprocessor">#define UNUSED(x) ((void)(x)) </span><span class="comment">/* to avoid warnings */</span>
<a name="l00104"></a>00104 <span class="preprocessor">#endif</span>
<a name="l00105"></a>00105 <span class="preprocessor"></span>
<a name="l00106"></a>00106
<a name="l00107"></a>00107 <span class="preprocessor">#ifndef cast</span>
<a name="l00108"></a><a class="code" href="llimits_8h.html#f17d62ec9e237a7644de6b9b34a48a34">00108</a> <span class="preprocessor"></span><span class="preprocessor">#define cast(t, exp) ((t)(exp))</span>
<a name="l00109"></a>00109 <span class="preprocessor"></span><span class="preprocessor">#endif</span>
<a name="l00110"></a>00110 <span class="preprocessor"></span>
<a name="l00111"></a>00111
<a name="l00112"></a>00112
<a name="l00113"></a>00113 <span class="comment">/*</span>
<a name="l00114"></a>00114 <span class="comment">** type for virtual-machine instructions</span>
<a name="l00115"></a>00115 <span class="comment">** must be an unsigned with (at least) 4 bytes (see details in lopcodes.h)</span>
<a name="l00116"></a>00116 <span class="comment">*/</span>
<a name="l00117"></a><a class="code" href="llimits_8h.html#f6c47c68c1e6b0387c915031e0e681e3">00117</a> <span class="keyword">typedef</span> <span class="keywordtype">unsigned</span> <span class="keywordtype">long</span> <a class="code" href="llimits_8h.html#f6c47c68c1e6b0387c915031e0e681e3">Instruction</a>;
<a name="l00118"></a>00118
<a name="l00119"></a>00119
<a name="l00120"></a>00120 <span class="comment">/* maximum depth for calls (unsigned short) */</span>
<a name="l00121"></a>00121 <span class="preprocessor">#ifndef LUA_MAXCALLS</span>
<a name="l00122"></a><a class="code" href="llimits_8h.html#fe4e96a2968d18bb6f352db0981b9f88">00122</a> <span class="preprocessor"></span><span class="preprocessor">#define LUA_MAXCALLS 4096</span>
<a name="l00123"></a>00123 <span class="preprocessor"></span><span class="preprocessor">#endif</span>
<a name="l00124"></a>00124 <span class="preprocessor"></span>
<a name="l00125"></a>00125
<a name="l00126"></a>00126 <span class="comment">/*</span>
<a name="l00127"></a>00127 <span class="comment">** maximum depth for C calls (unsigned short): Not too big, or may</span>
<a name="l00128"></a>00128 <span class="comment">** overflow the C stack...</span>
<a name="l00129"></a>00129 <span class="comment">*/</span>
<a name="l00130"></a>00130
<a name="l00131"></a>00131 <span class="preprocessor">#ifndef LUA_MAXCCALLS</span>
<a name="l00132"></a><a class="code" href="llimits_8h.html#649e1ecb4b14b74368bb63161033ac2d">00132</a> <span class="preprocessor"></span><span class="preprocessor">#define LUA_MAXCCALLS 200</span>
<a name="l00133"></a>00133 <span class="preprocessor"></span><span class="preprocessor">#endif</span>
<a name="l00134"></a>00134 <span class="preprocessor"></span>
<a name="l00135"></a>00135
<a name="l00136"></a>00136 <span class="comment">/* maximum size for the C stack */</span>
<a name="l00137"></a>00137 <span class="preprocessor">#ifndef LUA_MAXCSTACK</span>
<a name="l00138"></a><a class="code" href="llimits_8h.html#7457b3a1c6807372f1018e4534b7b193">00138</a> <span class="preprocessor"></span><span class="preprocessor">#define LUA_MAXCSTACK 2048</span>
<a name="l00139"></a>00139 <span class="preprocessor"></span><span class="preprocessor">#endif</span>
<a name="l00140"></a>00140 <span class="preprocessor"></span>
<a name="l00141"></a>00141
<a name="l00142"></a>00142 <span class="comment">/* maximum stack for a Lua function */</span>
<a name="l00143"></a><a class="code" href="llimits_8h.html#acca6649d32984be8e1aa076bf42fe46">00143</a> <span class="preprocessor">#define MAXSTACK 250</span>
<a name="l00144"></a>00144 <span class="preprocessor"></span>
<a name="l00145"></a>00145
<a name="l00146"></a>00146 <span class="comment">/* maximum number of variables declared in a function */</span>
<a name="l00147"></a>00147 <span class="preprocessor">#ifndef MAXVARS</span>
<a name="l00148"></a><a class="code" href="llimits_8h.html#0879a0e632584a9a8bee5ebffab571ca">00148</a> <span class="preprocessor"></span><span class="preprocessor">#define MAXVARS 200 </span><span class="comment">/* arbitrary limit (<MAXSTACK) */</span>
<a name="l00149"></a>00149 <span class="preprocessor">#endif</span>
<a name="l00150"></a>00150 <span class="preprocessor"></span>
<a name="l00151"></a>00151
<a name="l00152"></a>00152 <span class="comment">/* maximum number of upvalues per function */</span>
<a name="l00153"></a>00153 <span class="preprocessor">#ifndef MAXUPVALUES</span>
<a name="l00154"></a><a class="code" href="llimits_8h.html#4f894ed3a3712e01f74b1a9616bad4a3">00154</a> <span class="preprocessor"></span><span class="preprocessor">#define MAXUPVALUES 32</span>
<a name="l00155"></a>00155 <span class="preprocessor"></span><span class="preprocessor">#endif</span>
<a name="l00156"></a>00156 <span class="preprocessor"></span>
<a name="l00157"></a>00157
<a name="l00158"></a>00158 <span class="comment">/* maximum number of parameters in a function */</span>
<a name="l00159"></a>00159 <span class="preprocessor">#ifndef MAXPARAMS</span>
<a name="l00160"></a><a class="code" href="llimits_8h.html#5fdce82727e278d6647e0addafcd6db6">00160</a> <span class="preprocessor"></span><span class="preprocessor">#define MAXPARAMS 100 </span><span class="comment">/* arbitrary limit (<MAXLOCALS) */</span>
<a name="l00161"></a>00161 <span class="preprocessor">#endif</span>
<a name="l00162"></a>00162 <span class="preprocessor"></span>
<a name="l00163"></a>00163
<a name="l00164"></a>00164 <span class="comment">/* minimum size for the string table (must be power of 2) */</span>
<a name="l00165"></a>00165 <span class="preprocessor">#ifndef MINSTRTABSIZE</span>
<a name="l00166"></a><a class="code" href="llimits_8h.html#91604f8876fd042d7b1cdbade17927e6">00166</a> <span class="preprocessor"></span><span class="preprocessor">#define MINSTRTABSIZE 32</span>
<a name="l00167"></a>00167 <span class="preprocessor"></span><span class="preprocessor">#endif</span>
<a name="l00168"></a>00168 <span class="preprocessor"></span>
<a name="l00169"></a>00169
<a name="l00170"></a>00170 <span class="comment">/* minimum size for string buffer */</span>
<a name="l00171"></a>00171 <span class="preprocessor">#ifndef LUA_MINBUFFER</span>
<a name="l00172"></a><a class="code" href="llimits_8h.html#a0320f75a72bf131ae24d39111ac9938">00172</a> <span class="preprocessor"></span><span class="preprocessor">#define LUA_MINBUFFER 32</span>
<a name="l00173"></a>00173 <span class="preprocessor"></span><span class="preprocessor">#endif</span>
<a name="l00174"></a>00174 <span class="preprocessor"></span>
<a name="l00175"></a>00175
<a name="l00176"></a>00176 <span class="comment">/*</span>
<a name="l00177"></a>00177 <span class="comment">** maximum number of syntactical nested non-terminals: Not too big,</span>
<a name="l00178"></a>00178 <span class="comment">** or may overflow the C stack...</span>
<a name="l00179"></a>00179 <span class="comment">*/</span>
<a name="l00180"></a>00180 <span class="preprocessor">#ifndef LUA_MAXPARSERLEVEL</span>
<a name="l00181"></a><a class="code" href="llimits_8h.html#2c476f88ecb47ce65f06d805a79acf75">00181</a> <span class="preprocessor"></span><span class="preprocessor">#define LUA_MAXPARSERLEVEL 200</span>
<a name="l00182"></a>00182 <span class="preprocessor"></span><span class="preprocessor">#endif</span>
<a name="l00183"></a>00183 <span class="preprocessor"></span>
<a name="l00184"></a>00184
<a name="l00185"></a>00185 <span class="preprocessor">#endif</span>
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