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<h1>SymImpl.h</h1><div class="fragment"><pre class="fragment">00001 <span class="comment">/* </span>
00002 <span class="comment"> * Copyright (C) 2005 Maarten Keijzer</span>
00003 <span class="comment"> *</span>
00004 <span class="comment"> * This program is free software; you can redistribute it and/or modify</span>
00005 <span class="comment"> * it under the terms of version 2 of the GNU General Public License as </span>
00006 <span class="comment"> * published by the Free Software Foundation. </span>
00007 <span class="comment"> *</span>
00008 <span class="comment"> * This program is distributed in the hope that it will be useful,</span>
00009 <span class="comment"> * but WITHOUT ANY WARRANTY; without even the implied warranty of</span>
00010 <span class="comment"> * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the</span>
00011 <span class="comment"> * GNU General Public License for more details.</span>
00012 <span class="comment"> *</span>
00013 <span class="comment"> * You should have received a copy of the GNU General Public License</span>
00014 <span class="comment"> * along with this program; if not, write to the Free Software</span>
00015 <span class="comment"> * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA</span>
00016 <span class="comment"> */</span>
00017 <span class="preprocessor">#ifndef __SYM_IMPL_H__</span>
00018 <span class="preprocessor"></span><span class="preprocessor">#define __SYM_IMPL_H__</span>
00019 <span class="preprocessor"></span>
00020 <span class="preprocessor">#include &lt;vector&gt;</span>
00021
00022 <span class="preprocessor">#include "token.h"</span>
00023
00024 <span class="keyword">class </span>Sym;
00025
00026 <span class="preprocessor">#if __GNUC__ &gt; 4 </span>
00027 <span class="preprocessor"></span><span class="preprocessor">#include &lt;ext/pool_allocator.h&gt;</span>
00028 <span class="keyword">typedef</span> std::vector&lt;Sym, __gnu_cxx::__pool_alloc&lt;Sym&gt; &gt; std::vector&lt;Sym&gt;;
00029 <span class="comment">//typedef std::vector&lt;Sym&gt; SymVec;</span>
00030 <span class="preprocessor">#else</span>
00031 <span class="preprocessor"></span><span class="keyword">typedef</span> std::vector&lt;Sym&gt; SymVec;
00032 <span class="preprocessor">#endif</span>
00033 <span class="preprocessor"></span>
00034
00035 <span class="keyword">namespace </span>detail {
00036
00037 <span class="keyword">class </span>SymArgsImpl;
00038 <span class="keyword">class </span>SymArgs {
00039
00040 <span class="keyword">mutable</span> SymArgsImpl* pimpl; <span class="comment">// contains circular reference to vector&lt;Sym&gt;</span>
00041 <span class="keyword">mutable</span> <span class="keyword">const</span> std::vector&lt;Sym&gt;* args_ptr;
00042
00043 <span class="keyword">public</span>:
00044
00045 SymArgs();
00046 SymArgs(<span class="keyword">const</span> std::vector&lt;Sym&gt;&amp; v);
00047 ~SymArgs();
00048
00049 SymArgs(<span class="keyword">const</span> SymArgs&amp; args);
00050 <span class="keyword">const</span> SymArgs&amp; SymArgs::operator=(<span class="keyword">const</span> SymArgs&amp; other);
00051
00052 size_t len() <span class="keyword">const</span>;
00053 <span class="keyword">const</span> std::vector&lt;Sym&gt;&amp; vec()<span class="keyword"> const </span>{ <span class="keywordflow">return</span> *args_ptr; }
00054 <span class="keywordtype">void</span> fixate() <span class="keyword">const</span>;
00055 };
00056
00057 <span class="keyword">class </span>SymKey
00058 {
00059 <span class="keyword">public</span>:
00060 SymKey(token_t _token) : args(), token(_token), hash_code(calc_hash()) {}
00061 SymKey(token_t _token, <span class="keyword">const</span> detail::SymArgs&amp; _args) : args(_args), token(_token), hash_code(calc_hash()) {}
00062
00063 <span class="keywordtype">bool</span> operator==(<span class="keyword">const</span> SymKey&amp; other) <span class="keyword">const</span>;
00064
00065 <span class="keyword">struct </span>Hash
00066 {
00067 <span class="keywordtype">int</span> operator()(<span class="keyword">const</span> SymKey&amp; k)<span class="keyword"> const </span>{ <span class="keywordflow">return</span> k.calc_hash(); };
00068 };
00069
00070 <span class="keywordtype">unsigned</span> arity()<span class="keyword"> const </span>{ <span class="keywordflow">return</span> args.len(); }
00071 <span class="keyword">const</span> std::vector&lt;Sym&gt;&amp; vec()<span class="keyword"> const </span>{ <span class="keywordflow">return</span> args.vec(); }
00072
00073 <span class="comment">// fixates (i.e. claims memory) for the embedded vector of Syms</span>
00074 <span class="keywordtype">void</span> fixate()<span class="keyword"> const </span>{ args.fixate(); }
00075
00076 <span class="keywordtype">int</span> get_hash_code()<span class="keyword"> const </span>{ <span class="keywordflow">return</span> hash_code; }
00077
00078 detail::SymArgs args;
00079 token_t token; <span class="comment">// identifies the function</span>
00080
00081 <span class="keyword">private</span>:
00082 <span class="keywordtype">int</span> calc_hash() <span class="keyword">const</span>;
00083 <span class="keywordtype">int</span> hash_code;
00084 };
00085
00086 <span class="keyword">struct </span>SymValue
00087 {
00088 <span class="keyword">friend</span> <span class="keyword">class </span>Sym;
00089
00090 SymValue();
00091 ~SymValue();
00092
00093 <span class="keywordtype">unsigned</span> getRefCount()<span class="keyword"> const </span>{ <span class="keywordflow">return</span> refcount; }
00094 <span class="keywordtype">unsigned</span> getSize()<span class="keyword"> const </span>{ <span class="keywordflow">return</span> size; }
00095 <span class="keywordtype">unsigned</span> getDepth()<span class="keyword"> const </span>{ <span class="keywordflow">return</span> depth; }
00096
00097
00098
00099 <span class="comment">// for reference counting</span>
00100 <span class="keywordtype">unsigned</span> refcount;
00101
00102 <span class="comment">// some simple stats</span>
00103 <span class="keywordtype">unsigned</span> size;
00104 <span class="keywordtype">unsigned</span> depth;
00105 UniqueNodeStats* uniqueNodeStats;
00106
00107 };
00108
00109
00110 } <span class="comment">// namespace detail</span>
00111
00112 <span class="preprocessor">#endif</span>
00113 <span class="preprocessor"></span>
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