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<a href="minisat__derivation_8h.html">Go to the documentation of this file.</a><div class="fragment"><div class="line"><a name="l00001"></a><span class="lineno"> 1</span> <span class="comment">/*****************************************************************************/</span><span class="comment"></span></div>
<div class="line"><a name="l00002"></a><span class="lineno"> 2</span> <span class="comment">/*!</span></div>
<div class="line"><a name="l00003"></a><span class="lineno"> 3</span> <span class="comment"> *\file minisat_derivation.h</span></div>
<div class="line"><a name="l00004"></a><span class="lineno"> 4</span> <span class="comment"> *\brief MiniSat proof logging</span></div>
<div class="line"><a name="l00005"></a><span class="lineno"> 5</span> <span class="comment"> *</span></div>
<div class="line"><a name="l00006"></a><span class="lineno"> 6</span> <span class="comment"> * Author: Alexander Fuchs</span></div>
<div class="line"><a name="l00007"></a><span class="lineno"> 7</span> <span class="comment"> *</span></div>
<div class="line"><a name="l00008"></a><span class="lineno"> 8</span> <span class="comment"> * Created: Sun Dec 07 11:09:00 2007</span></div>
<div class="line"><a name="l00009"></a><span class="lineno"> 9</span> <span class="comment"> *</span></div>
<div class="line"><a name="l00010"></a><span class="lineno"> 10</span> <span class="comment"> * <hr></span></div>
<div class="line"><a name="l00011"></a><span class="lineno"> 11</span> <span class="comment"> *</span></div>
<div class="line"><a name="l00012"></a><span class="lineno"> 12</span> <span class="comment"> * License to use, copy, modify, sell and/or distribute this software</span></div>
<div class="line"><a name="l00013"></a><span class="lineno"> 13</span> <span class="comment"> * and its documentation for any purpose is hereby granted without</span></div>
<div class="line"><a name="l00014"></a><span class="lineno"> 14</span> <span class="comment"> * royalty, subject to the terms and conditions defined in the \ref</span></div>
<div class="line"><a name="l00015"></a><span class="lineno"> 15</span> <span class="comment"> * LICENSE file provided with this distribution.</span></div>
<div class="line"><a name="l00016"></a><span class="lineno"> 16</span> <span class="comment"> * </span></div>
<div class="line"><a name="l00017"></a><span class="lineno"> 17</span> <span class="comment"> * <hr></span></div>
<div class="line"><a name="l00018"></a><span class="lineno"> 18</span> <span class="comment"> */</span></div>
<div class="line"><a name="l00019"></a><span class="lineno"> 19</span> <span class="comment">/*****************************************************************************/</span></div>
<div class="line"><a name="l00020"></a><span class="lineno"> 20</span> </div>
<div class="line"><a name="l00021"></a><span class="lineno"> 21</span> <span class="preprocessor">#ifndef _cvc3__sat__minisat_derivation_h_</span></div>
<div class="line"><a name="l00022"></a><span class="lineno"> 22</span> <span class="preprocessor"></span><span class="preprocessor">#define _cvc3__sat__minisat_derivation_h_</span></div>
<div class="line"><a name="l00023"></a><span class="lineno"> 23</span> <span class="preprocessor"></span></div>
<div class="line"><a name="l00024"></a><span class="lineno"> 24</span> </div>
<div class="line"><a name="l00025"></a><span class="lineno"> 25</span> <span class="preprocessor">#include "<a class="code" href="minisat__types_8h.html" title="MiniSat internal types.">minisat_types.h</a>"</span></div>
<div class="line"><a name="l00026"></a><span class="lineno"> 26</span> <span class="preprocessor">#include <<a class="code" href="hash__map_8h.html" title="hash map implementation">hash_map.h</a>></span></div>
<div class="line"><a name="l00027"></a><span class="lineno"> 27</span> <span class="preprocessor">#include <<a class="code" href="hash__set_8h.html" title="hash map implementation">hash_set.h</a>></span></div>
<div class="line"><a name="l00028"></a><span class="lineno"> 28</span> <span class="preprocessor">#include <set></span></div>
<div class="line"><a name="l00029"></a><span class="lineno"> 29</span> <span class="preprocessor">#include <vector></span></div>
<div class="line"><a name="l00030"></a><span class="lineno"> 30</span> <span class="preprocessor">#include <deque></span></div>
<div class="line"><a name="l00031"></a><span class="lineno"> 31</span> <span class="preprocessor">#include <algorithm></span></div>
<div class="line"><a name="l00032"></a><span class="lineno"> 32</span> <span class="preprocessor">#include <string></span></div>
<div class="line"><a name="l00033"></a><span class="lineno"> 33</span> </div>
<div class="line"><a name="l00034"></a><span class="lineno"> 34</span> <span class="keyword">namespace </span>SAT {</div>
<div class="line"><a name="l00035"></a><span class="lineno"> 35</span>  <span class="keyword">class </span>SatProof;</div>
<div class="line"><a name="l00036"></a><span class="lineno"> 36</span> }</div>
<div class="line"><a name="l00037"></a><span class="lineno"> 37</span> </div>
<div class="line"><a name="l00038"></a><span class="lineno"> 38</span> <span class="keyword">namespace </span>MiniSat {</div>
<div class="line"><a name="l00039"></a><span class="lineno"> 39</span>  <span class="comment">// a resolution inference as a sequence of binary resolution steps</span></div>
<div class="line"><a name="l00040"></a><span class="lineno"><a class="code" href="classMiniSat_1_1Inference.html"> 40</a></span>  <span class="keyword">class </span><a class="code" href="classMiniSat_1_1Inference.html">Inference</a> {</div>
<div class="line"><a name="l00041"></a><span class="lineno"> 41</span>  <span class="keyword">public</span>:</div>
<div class="line"><a name="l00042"></a><span class="lineno"><a class="code" href="classMiniSat_1_1Inference.html#a0eef845f209a9bc406fe887c34f82553"> 42</a></span>  <span class="keyword">typedef</span> std::vector<std::pair<Lit, int> > <a class="code" href="classMiniSat_1_1Inference.html#a0eef845f209a9bc406fe887c34f82553">TSteps</a>;</div>
<div class="line"><a name="l00043"></a><span class="lineno"> 43</span> </div>
<div class="line"><a name="l00044"></a><span class="lineno"> 44</span>  <span class="keyword">private</span>:</div>
<div class="line"><a name="l00045"></a><span class="lineno"> 45</span>  <span class="comment">// id of first clause</span></div>
<div class="line"><a name="l00046"></a><span class="lineno"><a class="code" href="classMiniSat_1_1Inference.html#accb661eccfd99a099e87826cd4de1401"> 46</a></span>  <span class="keywordtype">int</span> <a class="code" href="classMiniSat_1_1Inference.html#accb661eccfd99a099e87826cd4de1401">d_start</a>;</div>
<div class="line"><a name="l00047"></a><span class="lineno"> 47</span> </div>
<div class="line"><a name="l00048"></a><span class="lineno"> 48</span>  <span class="comment">// binary resolution step:</span></div>
<div class="line"><a name="l00049"></a><span class="lineno"> 49</span>  <span class="comment">// result of previous step (or d_start)</span></div>
<div class="line"><a name="l00050"></a><span class="lineno"> 50</span>  <span class="comment">// on literal with next clause (given by id)</span></div>
<div class="line"><a name="l00051"></a><span class="lineno"><a class="code" href="classMiniSat_1_1Inference.html#abc3a42c6b8b055f9b5b021590a3f1a00"> 51</a></span>  <a class="code" href="classMiniSat_1_1Inference.html#a0eef845f209a9bc406fe887c34f82553">TSteps</a> <a class="code" href="classMiniSat_1_1Inference.html#abc3a42c6b8b055f9b5b021590a3f1a00">d_steps</a>;</div>
<div class="line"><a name="l00052"></a><span class="lineno"> 52</span> </div>
<div class="line"><a name="l00053"></a><span class="lineno"> 53</span>  <span class="keyword">public</span>:</div>
<div class="line"><a name="l00054"></a><span class="lineno"><a class="code" href="classMiniSat_1_1Inference.html#aacd20460934eca56417f7add43e9150c"> 54</a></span>  <a class="code" href="classMiniSat_1_1Inference.html#aacd20460934eca56417f7add43e9150c">Inference</a>(<span class="keywordtype">int</span> clauseID) : <a class="code" href="classMiniSat_1_1Inference.html#accb661eccfd99a099e87826cd4de1401">d_start</a>(clauseID) {</div>
<div class="line"><a name="l00055"></a><span class="lineno"> 55</span>  <span class="comment">// std::cout << "Start inference: " << clauseID << std::endl;</span></div>
<div class="line"><a name="l00056"></a><span class="lineno"> 56</span>  };</div>
<div class="line"><a name="l00057"></a><span class="lineno"> 57</span> </div>
<div class="line"><a name="l00058"></a><span class="lineno"><a class="code" href="classMiniSat_1_1Inference.html#a61184032373fe3049198f8e3a71e436f"> 58</a></span>  <span class="keywordtype">void</span> <a class="code" href="classMiniSat_1_1Inference.html#a61184032373fe3049198f8e3a71e436f">add</a>(<a class="code" href="classMiniSat_1_1Lit.html">Lit</a> lit, <span class="keywordtype">int</span> clauseID) {</div>
<div class="line"><a name="l00059"></a><span class="lineno"> 59</span>  <a class="code" href="classMiniSat_1_1Inference.html#abc3a42c6b8b055f9b5b021590a3f1a00">d_steps</a>.push_back(std::make_pair(lit, clauseID));</div>
<div class="line"><a name="l00060"></a><span class="lineno"> 60</span>  };</div>
<div class="line"><a name="l00061"></a><span class="lineno"> 61</span> </div>
<div class="line"><a name="l00062"></a><span class="lineno"><a class="code" href="classMiniSat_1_1Inference.html#aa1ae6b861dd2a7dc80348d96e204bd8b"> 62</a></span>  <span class="keywordtype">void</span> <a class="code" href="classMiniSat_1_1Inference.html#aa1ae6b861dd2a7dc80348d96e204bd8b">add</a>(<a class="code" href="classMiniSat_1_1Lit.html">Lit</a> lit, <a class="code" href="classMiniSat_1_1Clause.html">Clause</a>* clause) {</div>
<div class="line"><a name="l00063"></a><span class="lineno"> 63</span>  <a class="code" href="classMiniSat_1_1Inference.html#a61184032373fe3049198f8e3a71e436f">add</a>(lit, clause-><a class="code" href="classMiniSat_1_1Clause.html#aeb8881da1f982f5bc58bac190ab2f2a4">id</a>());</div>
<div class="line"><a name="l00064"></a><span class="lineno"> 64</span>  };</div>
<div class="line"><a name="l00065"></a><span class="lineno"> 65</span> </div>
<div class="line"><a name="l00066"></a><span class="lineno"><a class="code" href="classMiniSat_1_1Inference.html#a932d4071d9f794757ad9db27cb3fd1a3"> 66</a></span>  <span class="keywordtype">int</span> <a class="code" href="classMiniSat_1_1Inference.html#a932d4071d9f794757ad9db27cb3fd1a3">getStart</a>()<span class="keyword"> const </span>{</div>
<div class="line"><a name="l00067"></a><span class="lineno"> 67</span>  <span class="keywordflow">return</span> <a class="code" href="classMiniSat_1_1Inference.html#accb661eccfd99a099e87826cd4de1401">d_start</a>;</div>
<div class="line"><a name="l00068"></a><span class="lineno"> 68</span>  }</div>
<div class="line"><a name="l00069"></a><span class="lineno"> 69</span> </div>
<div class="line"><a name="l00070"></a><span class="lineno"><a class="code" href="classMiniSat_1_1Inference.html#a4111b13d1401b38cbe749357793883fa"> 70</a></span>  <span class="keyword">const</span> <a class="code" href="classMiniSat_1_1Inference.html#a0eef845f209a9bc406fe887c34f82553">TSteps</a>& <a class="code" href="classMiniSat_1_1Inference.html#a4111b13d1401b38cbe749357793883fa">getSteps</a>()<span class="keyword"> const </span>{</div>
<div class="line"><a name="l00071"></a><span class="lineno"> 71</span>  <span class="keywordflow">return</span> <a class="code" href="classMiniSat_1_1Inference.html#abc3a42c6b8b055f9b5b021590a3f1a00">d_steps</a>;</div>
<div class="line"><a name="l00072"></a><span class="lineno"> 72</span>  }</div>
<div class="line"><a name="l00073"></a><span class="lineno"> 73</span> </div>
<div class="line"><a name="l00074"></a><span class="lineno"> 74</span>  <span class="comment">// returns steps as a lits: clauseId0 literal0.toString clauseID1 ...</span></div>
<div class="line"><a name="l00075"></a><span class="lineno"> 75</span>  std::string <a class="code" href="classMiniSat_1_1Inference.html#aacd9c375bc7b8b0d87a15bcd9b5d35ce">toString</a>() <span class="keyword">const</span>;</div>
<div class="line"><a name="l00076"></a><span class="lineno"> 76</span>  };</div>
<div class="line"><a name="l00077"></a><span class="lineno"> 77</span> </div>
<div class="line"><a name="l00078"></a><span class="lineno"> 78</span> </div>
<div class="line"><a name="l00079"></a><span class="lineno"> 79</span>  <span class="keyword">class </span>Solver;</div>
<div class="line"><a name="l00080"></a><span class="lineno"> 80</span> </div>
<div class="line"><a name="l00081"></a><span class="lineno"> 81</span>  <span class="comment">// Heavily based on the proof logging version of MiniSat (1.14p)</span></div>
<div class="line"><a name="l00082"></a><span class="lineno"> 82</span>  <span class="comment">//</span></div>
<div class="line"><a name="l00083"></a><span class="lineno"> 83</span>  <span class="comment">// Note: this implementation keeps the whole derivation in memory -</span></div>
<div class="line"><a name="l00084"></a><span class="lineno"> 84</span>  <span class="comment">// for many problems this is not feasible.</span></div>
<div class="line"><a name="l00085"></a><span class="lineno"> 85</span>  <span class="comment">// should provide an alternative implementation that logs the derivation</span></div>
<div class="line"><a name="l00086"></a><span class="lineno"> 86</span>  <span class="comment">// to a file and constructs the proof from it.</span></div>
<div class="line"><a name="l00087"></a><span class="lineno"><a class="code" href="classMiniSat_1_1Derivation.html"> 87</a></span>  <span class="keyword">class </span><a class="code" href="classMiniSat_1_1Derivation.html">Derivation</a> {</div>
<div class="line"><a name="l00088"></a><span class="lineno"> 88</span>  <span class="keyword">public</span>:</div>
<div class="line"><a name="l00089"></a><span class="lineno"><a class="code" href="classMiniSat_1_1Derivation.html#ae65f535354bdc282a534bbc545020939"> 89</a></span>  <span class="keyword">typedef</span> <a class="code" href="classHash_1_1hash__map.html">Hash::hash_map<int, Clause*></a> <a class="code" href="classMiniSat_1_1Derivation.html#ae65f535354bdc282a534bbc545020939">TClauses</a>;</div>
<div class="line"><a name="l00090"></a><span class="lineno"><a class="code" href="classMiniSat_1_1Derivation.html#aeb7fb6543cb0d529aaa2bfc841e0aa47"> 90</a></span>  <span class="keyword">typedef</span> <a class="code" href="classHash_1_1hash__set.html">Hash::hash_set<int></a> <a class="code" href="classMiniSat_1_1Derivation.html#aeb7fb6543cb0d529aaa2bfc841e0aa47">TInputClauses</a>;</div>
<div class="line"><a name="l00091"></a><span class="lineno"><a class="code" href="classMiniSat_1_1Derivation.html#a4f8e0c51560466d4a511c048dc6f046d"> 91</a></span>  <span class="keyword">typedef</span> <a class="code" href="classHash_1_1hash__map.html">Hash::hash_map<int, Inference*></a> <a class="code" href="classMiniSat_1_1Derivation.html#a4f8e0c51560466d4a511c048dc6f046d">TInferences</a>;</div>
<div class="line"><a name="l00092"></a><span class="lineno"> 92</span> </div>
<div class="line"><a name="l00093"></a><span class="lineno"> 93</span>  <span class="keyword">private</span>:</div>
<div class="line"><a name="l00094"></a><span class="lineno"> 94</span>  <span class="comment">// mapping from id to clause</span></div>
<div class="line"><a name="l00095"></a><span class="lineno"><a class="code" href="classMiniSat_1_1Derivation.html#a2c42531abc26a1e8de7f81025e083214"> 95</a></span>  <a class="code" href="classHash_1_1hash__map.html">TClauses</a> <a class="code" href="classMiniSat_1_1Derivation.html#a2c42531abc26a1e8de7f81025e083214">d_clauses</a>;</div>
<div class="line"><a name="l00096"></a><span class="lineno"> 96</span> </div>
<div class="line"><a name="l00097"></a><span class="lineno"> 97</span>  <span class="comment">// as an additional check, explicitely mark which clauses are input clauses</span></div>
<div class="line"><a name="l00098"></a><span class="lineno"> 98</span>  <span class="comment">// by adding their id to this set.</span></div>
<div class="line"><a name="l00099"></a><span class="lineno"> 99</span>  <span class="comment">//</span></div>
<div class="line"><a name="l00100"></a><span class="lineno"> 100</span>  <span class="comment">// as an invariant an id should be either in d_inferences or d_inputClauses,</span></div>
<div class="line"><a name="l00101"></a><span class="lineno"> 101</span>  <span class="comment">// as a clause does exactly have no inference attached if it is an input clause.</span></div>
<div class="line"><a name="l00102"></a><span class="lineno"><a class="code" href="classMiniSat_1_1Derivation.html#abb29d2dd68d48989190d3356da2d0ae4"> 102</a></span>  <a class="code" href="classHash_1_1hash__set.html">TInputClauses</a> <a class="code" href="classMiniSat_1_1Derivation.html#abb29d2dd68d48989190d3356da2d0ae4">d_inputClauses</a>;</div>
<div class="line"><a name="l00103"></a><span class="lineno"> 103</span> </div>
<div class="line"><a name="l00104"></a><span class="lineno"> 104</span>  <span class="comment">// unit clauses derived with computeRootReason</span></div>
<div class="line"><a name="l00105"></a><span class="lineno"> 105</span>  <span class="comment">// mapping from index of literal to clause</span></div>
<div class="line"><a name="l00106"></a><span class="lineno"><a class="code" href="classMiniSat_1_1Derivation.html#ae1fc34cb0a0c68bd82d2d1c80892f466"> 106</a></span>  <a class="code" href="classHash_1_1hash__map.html">TClauses</a> <a class="code" href="classMiniSat_1_1Derivation.html#ae1fc34cb0a0c68bd82d2d1c80892f466">d_unitClauses</a>;</div>
<div class="line"><a name="l00107"></a><span class="lineno"> 107</span> </div>
<div class="line"><a name="l00108"></a><span class="lineno"> 108</span>  <span class="comment">// mapping from clause id to the inference it was derived by</span></div>
<div class="line"><a name="l00109"></a><span class="lineno"><a class="code" href="classMiniSat_1_1Derivation.html#a5dc6e9795fc769f2c2665b3667dbdc7d"> 109</a></span>  <a class="code" href="classHash_1_1hash__map.html">TInferences</a> <a class="code" href="classMiniSat_1_1Derivation.html#a5dc6e9795fc769f2c2665b3667dbdc7d">d_inferences</a>;</div>
<div class="line"><a name="l00110"></a><span class="lineno"> 110</span> </div>
<div class="line"><a name="l00111"></a><span class="lineno"> 111</span>  <span class="comment">// clauses removed from the solver</span></div>
<div class="line"><a name="l00112"></a><span class="lineno"><a class="code" href="classMiniSat_1_1Derivation.html#a643c4cd61616c700b5e97c82aa55e062"> 112</a></span>  std::deque<Clause*> <a class="code" href="classMiniSat_1_1Derivation.html#a643c4cd61616c700b5e97c82aa55e062">d_removedClauses</a>;</div>
<div class="line"><a name="l00113"></a><span class="lineno"> 113</span> </div>
<div class="line"><a name="l00114"></a><span class="lineno"> 114</span>  <span class="comment">// empty clause of derivation, if derived</span></div>
<div class="line"><a name="l00115"></a><span class="lineno"><a class="code" href="classMiniSat_1_1Derivation.html#a7f00bbd5b002f55eea71e62b06209021"> 115</a></span>  <a class="code" href="classMiniSat_1_1Clause.html">Clause</a>* <a class="code" href="classMiniSat_1_1Derivation.html#a7f00bbd5b002f55eea71e62b06209021">d_emptyClause</a>;</div>
<div class="line"><a name="l00116"></a><span class="lineno"> 116</span> </div>
<div class="line"><a name="l00117"></a><span class="lineno"> 117</span>  <span class="keyword">public</span>:</div>
<div class="line"><a name="l00118"></a><span class="lineno"><a class="code" href="classMiniSat_1_1Derivation.html#af89db5799084d51dcb97bd24847d9633"> 118</a></span>  <a class="code" href="classMiniSat_1_1Derivation.html#af89db5799084d51dcb97bd24847d9633">Derivation</a>() : <a class="code" href="classMiniSat_1_1Derivation.html#a7f00bbd5b002f55eea71e62b06209021">d_emptyClause</a>(NULL) {};</div>
<div class="line"><a name="l00119"></a><span class="lineno"> 119</span>  <a class="code" href="classMiniSat_1_1Derivation.html#a72d5632fb889b903e8f88891943e5562">~Derivation</a>();</div>
<div class="line"><a name="l00120"></a><span class="lineno"> 120</span> </div>
<div class="line"><a name="l00121"></a><span class="lineno"> 121</span>  <span class="comment">// note: allow for duplicate insertion of clauses registerClause and registerInputClause,</span></div>
<div class="line"><a name="l00122"></a><span class="lineno"> 122</span>  <span class="comment">// as this can happen in the current implementation</span></div>
<div class="line"><a name="l00123"></a><span class="lineno"> 123</span>  <span class="comment">// for theory clauses which are inconsistent on insertion.</span></div>
<div class="line"><a name="l00124"></a><span class="lineno"> 124</span> </div>
<div class="line"><a name="l00125"></a><span class="lineno"> 125</span>  <span class="comment">// register a new clause</span></div>
<div class="line"><a name="l00126"></a><span class="lineno"><a class="code" href="classMiniSat_1_1Derivation.html#a86b49978f3ea0aa72cd4815e241ff7ad"> 126</a></span>  <span class="keywordtype">void</span> <a class="code" href="classMiniSat_1_1Derivation.html#a86b49978f3ea0aa72cd4815e241ff7ad">registerClause</a>(<a class="code" href="classMiniSat_1_1Clause.html">Clause</a>* clause) {</div>
<div class="line"><a name="l00127"></a><span class="lineno"> 127</span>  <span class="comment">// std::cout << "register clause : " << clause->id() << " : " << clause->toString() << std::endl;</span></div>
<div class="line"><a name="l00128"></a><span class="lineno"> 128</span> </div>
<div class="line"><a name="l00129"></a><span class="lineno"> 129</span>  <span class="comment">//IF_DEBUG (</span></div>
<div class="line"><a name="l00130"></a><span class="lineno"> 130</span>  <span class="keywordflow">if</span> (<a class="code" href="classMiniSat_1_1Derivation.html#a2c42531abc26a1e8de7f81025e083214">d_clauses</a>.<a class="code" href="classHash_1_1hash__map.html#a48feee7c5690c9cd9ba1b0817ca3ae9f" title="status">contains</a>(clause-><a class="code" href="classMiniSat_1_1Clause.html#aeb8881da1f982f5bc58bac190ab2f2a4">id</a>())) {</div>
<div class="line"><a name="l00131"></a><span class="lineno"> 131</span>  <span class="comment">// if clause with id does already exist,</span></div>
<div class="line"><a name="l00132"></a><span class="lineno"> 132</span>  <span class="comment">// then it must be a simplification of the original clause</span></div>
<div class="line"><a name="l00133"></a><span class="lineno"> 133</span>  <a class="code" href="classMiniSat_1_1Clause.html">Clause</a>* old = <a class="code" href="classMiniSat_1_1Derivation.html#a2c42531abc26a1e8de7f81025e083214">d_clauses</a>[clause-><a class="code" href="classMiniSat_1_1Clause.html#aeb8881da1f982f5bc58bac190ab2f2a4">id</a>()];</div>
<div class="line"><a name="l00134"></a><span class="lineno"> 134</span>  <a class="code" href="debug_8h.html#a2637b2fffa22e3c9fad40cda8fcc3bce" title="If something goes horribly wrong, print a message and abort immediately with exit(1).">FatalAssert</a>(old-><a class="code" href="classMiniSat_1_1Clause.html#adf5aa50a639b4b5bb71e5ea76d45b8e2">size</a>() == clause-><a class="code" href="classMiniSat_1_1Clause.html#adf5aa50a639b4b5bb71e5ea76d45b8e2">size</a>(),</div>
<div class="line"><a name="l00135"></a><span class="lineno"> 135</span>  <span class="stringliteral">"MiniSat::Derivation::registerClause: new clause of different size than old clause of same id"</span>);</div>
<div class="line"><a name="l00136"></a><span class="lineno"> 136</span> </div>
<div class="line"><a name="l00137"></a><span class="lineno"> 137</span>  std::set<Lit> oldS;</div>
<div class="line"><a name="l00138"></a><span class="lineno"> 138</span>  <span class="keywordflow">for</span> (<span class="keywordtype">int</span> i = 0; i < old-><a class="code" href="classMiniSat_1_1Clause.html#adf5aa50a639b4b5bb71e5ea76d45b8e2">size</a>(); ++i) {</div>
<div class="line"><a name="l00139"></a><span class="lineno"> 139</span>  oldS.insert((*old)[i]);</div>
<div class="line"><a name="l00140"></a><span class="lineno"> 140</span>  }</div>
<div class="line"><a name="l00141"></a><span class="lineno"> 141</span> </div>
<div class="line"><a name="l00142"></a><span class="lineno"> 142</span>  <span class="keywordflow">for</span> (<span class="keywordtype">int</span> i = 0; i < clause-><a class="code" href="classMiniSat_1_1Clause.html#adf5aa50a639b4b5bb71e5ea76d45b8e2">size</a>(); ++i) {</div>
<div class="line"><a name="l00143"></a><span class="lineno"> 143</span>  <a class="code" href="debug_8h.html#a2637b2fffa22e3c9fad40cda8fcc3bce" title="If something goes horribly wrong, print a message and abort immediately with exit(1).">FatalAssert</a>(oldS.find((*clause)[i]) != oldS.end(),</div>
<div class="line"><a name="l00144"></a><span class="lineno"> 144</span>  <span class="stringliteral">"MiniSat::Derivation::registerClause: new clause not subset of old clause of same id"</span>);</div>
<div class="line"><a name="l00145"></a><span class="lineno"> 145</span>  oldS.erase((*clause)[i]);</div>
<div class="line"><a name="l00146"></a><span class="lineno"> 146</span>  }</div>
<div class="line"><a name="l00147"></a><span class="lineno"> 147</span>  <a class="code" href="debug_8h.html#a2637b2fffa22e3c9fad40cda8fcc3bce" title="If something goes horribly wrong, print a message and abort immediately with exit(1).">FatalAssert</a>(oldS.empty(),</div>
<div class="line"><a name="l00148"></a><span class="lineno"> 148</span>  <span class="stringliteral">"MiniSat::Derivation::registerClause: old clause not subset of new clause of same id"</span>);</div>
<div class="line"><a name="l00149"></a><span class="lineno"> 149</span>  }</div>
<div class="line"><a name="l00150"></a><span class="lineno"> 150</span>  <span class="comment">//)</span></div>
<div class="line"><a name="l00151"></a><span class="lineno"> 151</span>  <a class="code" href="classMiniSat_1_1Derivation.html#a2c42531abc26a1e8de7f81025e083214">d_clauses</a>[clause-><a class="code" href="classMiniSat_1_1Clause.html#aeb8881da1f982f5bc58bac190ab2f2a4">id</a>()] = clause;</div>
<div class="line"><a name="l00152"></a><span class="lineno"> 152</span>  };</div>
<div class="line"><a name="l00153"></a><span class="lineno"> 153</span> </div>
<div class="line"><a name="l00154"></a><span class="lineno"> 154</span>  <span class="comment">// mark clause as input clause, i.e. true without premises</span></div>
<div class="line"><a name="l00155"></a><span class="lineno"><a class="code" href="classMiniSat_1_1Derivation.html#a8f1063fe441a90d388e56ca4002a87e1"> 155</a></span>  <span class="keywordtype">void</span> <a class="code" href="classMiniSat_1_1Derivation.html#a8f1063fe441a90d388e56ca4002a87e1">registerInputClause</a>(<span class="keywordtype">int</span> clauseID) {</div>
<div class="line"><a name="l00156"></a><span class="lineno"> 156</span>  <span class="comment">// std::cout << "registerInputClause: " << clauseID << std::endl;</span></div>
<div class="line"><a name="l00157"></a><span class="lineno"> 157</span>  <a class="code" href="classMiniSat_1_1Derivation.html#abb29d2dd68d48989190d3356da2d0ae4">d_inputClauses</a>.<a class="code" href="classHash_1_1hash__set.html#a156c40ba629d5aba7f7cacf4eeab1e2d">insert</a>(clauseID);</div>
<div class="line"><a name="l00158"></a><span class="lineno"> 158</span>  };</div>
<div class="line"><a name="l00159"></a><span class="lineno"> 159</span> </div>
<div class="line"><a name="l00160"></a><span class="lineno"> 160</span>  <span class="comment">// clause has been removed from the solver or created internally in Derivation,</span></div>
<div class="line"><a name="l00161"></a><span class="lineno"> 161</span>  <span class="comment">// so store it here for later garbage collection.</span></div>
<div class="line"><a name="l00162"></a><span class="lineno"><a class="code" href="classMiniSat_1_1Derivation.html#a98bcad6982734612b1afd68e38dea7b8"> 162</a></span>  <span class="keywordtype">void</span> <a class="code" href="classMiniSat_1_1Derivation.html#a98bcad6982734612b1afd68e38dea7b8">removedClause</a>(<a class="code" href="classMiniSat_1_1Clause.html">Clause</a>* clause) {</div>
<div class="line"><a name="l00163"></a><span class="lineno"> 163</span>  <a class="code" href="debug_8h.html#a2637b2fffa22e3c9fad40cda8fcc3bce" title="If something goes horribly wrong, print a message and abort immediately with exit(1).">FatalAssert</a>(clause != NULL, <span class="stringliteral">"MiniSat::derivation:removedClause: NULL"</span>);</div>
<div class="line"><a name="l00164"></a><span class="lineno"> 164</span>  <a class="code" href="classMiniSat_1_1Derivation.html#a643c4cd61616c700b5e97c82aa55e062">d_removedClauses</a>.push_back(clause);</div>
<div class="line"><a name="l00165"></a><span class="lineno"> 165</span>  };</div>
<div class="line"><a name="l00166"></a><span class="lineno"> 166</span> </div>
<div class="line"><a name="l00167"></a><span class="lineno"> 167</span>  <span class="comment">// register the inference of a clause; takes ownership of inference</span></div>
<div class="line"><a name="l00168"></a><span class="lineno"><a class="code" href="classMiniSat_1_1Derivation.html#a7c0cfa1103212b370236814a4923dec5"> 168</a></span>  <span class="keywordtype">void</span> <a class="code" href="classMiniSat_1_1Derivation.html#a7c0cfa1103212b370236814a4923dec5">registerInference</a>(<span class="keywordtype">int</span> clauseID, <a class="code" href="classMiniSat_1_1Inference.html">Inference</a>* inference) {</div>
<div class="line"><a name="l00169"></a><span class="lineno"> 169</span>  <a class="code" href="debug_8h.html#a2637b2fffa22e3c9fad40cda8fcc3bce" title="If something goes horribly wrong, print a message and abort immediately with exit(1).">FatalAssert</a>(!<a class="code" href="classMiniSat_1_1Derivation.html#a5dc6e9795fc769f2c2665b3667dbdc7d">d_inferences</a>.<a class="code" href="classHash_1_1hash__map.html#a48feee7c5690c9cd9ba1b0817ca3ae9f" title="status">contains</a>(clauseID),</div>
<div class="line"><a name="l00170"></a><span class="lineno"> 170</span>  <span class="stringliteral">"MiniSat::Derivation::registerInference: inference for clauseID already registered"</span>);</div>
<div class="line"><a name="l00171"></a><span class="lineno"> 171</span>  <span class="comment">// std::cout << "Register inference: " << clauseID << " : " << inference->toString() << std::endl;</span></div>
<div class="line"><a name="l00172"></a><span class="lineno"> 172</span>  <a class="code" href="classMiniSat_1_1Derivation.html#a5dc6e9795fc769f2c2665b3667dbdc7d">d_inferences</a>[clauseID] = inference;</div>
<div class="line"><a name="l00173"></a><span class="lineno"> 173</span>  };</div>
<div class="line"><a name="l00174"></a><span class="lineno"> 174</span> </div>
<div class="line"><a name="l00175"></a><span class="lineno"> 175</span>  <span class="comment">// implied is a literal that is implied at the root level.</span></div>
<div class="line"><a name="l00176"></a><span class="lineno"> 176</span>  <span class="comment">// return the id of the implying unit clause [literal], if it exists.</span></div>
<div class="line"><a name="l00177"></a><span class="lineno"> 177</span>  <span class="comment">//</span></div>
<div class="line"><a name="l00178"></a><span class="lineno"> 178</span>  <span class="comment">// otherwise derive it from its reasons and return the new clause id.</span></div>
<div class="line"><a name="l00179"></a><span class="lineno"> 179</span>  <span class="comment">// derived unit clauses are stored internally, independently of the Solver</span></div>
<div class="line"><a name="l00180"></a><span class="lineno"> 180</span>  <span class="comment">//</span></div>
<div class="line"><a name="l00181"></a><span class="lineno"> 181</span>  <span class="comment">// may resolve theory implications with Solver::resolveTheoryImplication</span></div>
<div class="line"><a name="l00182"></a><span class="lineno"> 182</span>  <span class="keywordtype">int</span> <a class="code" href="classMiniSat_1_1Derivation.html#ac5cf738303de9c9c2b15d7d9e0b44cce">computeRootReason</a>(<a class="code" href="classMiniSat_1_1Lit.html">Lit</a> implied, <a class="code" href="classMiniSat_1_1Solver.html">Solver</a>* solver);</div>
<div class="line"><a name="l00183"></a><span class="lineno"> 183</span> </div>
<div class="line"><a name="l00184"></a><span class="lineno"> 184</span> </div>
<div class="line"><a name="l00185"></a><span class="lineno"> 185</span>  <span class="comment">// register the empty clause (or a clause falsified in the root level)</span></div>
<div class="line"><a name="l00186"></a><span class="lineno"> 186</span>  <span class="comment">// showing that the clause set is unsatisfiable.</span></div>
<div class="line"><a name="l00187"></a><span class="lineno"> 187</span>  <span class="comment">//</span></div>
<div class="line"><a name="l00188"></a><span class="lineno"> 188</span>  <span class="comment">// if clause is not the empty clause, the empty clause is derived from it,</span></div>
<div class="line"><a name="l00189"></a><span class="lineno"> 189</span>  <span class="comment">// possible using computeRootReason</span></div>
<div class="line"><a name="l00190"></a><span class="lineno"> 190</span>  <span class="keywordtype">void</span> <a class="code" href="classMiniSat_1_1Derivation.html#ad17e91fe3a421ef68df9463710c5fdc9">finish</a>(<a class="code" href="classMiniSat_1_1Clause.html">Clause</a>* clause, <a class="code" href="classMiniSat_1_1Solver.html">Solver</a>* solver);</div>
<div class="line"><a name="l00191"></a><span class="lineno"> 191</span> </div>
<div class="line"><a name="l00192"></a><span class="lineno"> 192</span> </div>
<div class="line"><a name="l00193"></a><span class="lineno"> 193</span>  <span class="comment">// print the derivation of the given clause</span></div>
<div class="line"><a name="l00194"></a><span class="lineno"> 194</span>  <span class="comment">//</span></div>
<div class="line"><a name="l00195"></a><span class="lineno"> 195</span>  <span class="comment">// output is of the form:</span></div>
<div class="line"><a name="l00196"></a><span class="lineno"> 196</span>  <span class="comment">// ID D : L1 ... Ln : C1 K1 C2 K2 ... Cm</span></div>
<div class="line"><a name="l00197"></a><span class="lineno"> 197</span>  <span class="comment">// where:</span></div>
<div class="line"><a name="l00198"></a><span class="lineno"> 198</span>  <span class="comment">// ID - the id of a clause</span></div>
<div class="line"><a name="l00199"></a><span class="lineno"> 199</span>  <span class="comment">// D - 'I' for an input clause, 'D' for a clause derived from other clauses</span></div>
<div class="line"><a name="l00200"></a><span class="lineno"> 200</span>  <span class="comment">// Li - the clause literals</span></div>
<div class="line"><a name="l00201"></a><span class="lineno"> 201</span>  <span class="comment">// Ci Ki - the clause is derived from these clauses by binary resolution on the given literals</span></div>
<div class="line"><a name="l00202"></a><span class="lineno"> 202</span>  <span class="comment">//</span></div>
<div class="line"><a name="l00203"></a><span class="lineno"> 203</span>  <span class="comment">// factoring is done after each resolution step, i.e. duplicate literals are removed from the clause.</span></div>
<div class="line"><a name="l00204"></a><span class="lineno"> 204</span>  <span class="comment">//</span></div>
<div class="line"><a name="l00205"></a><span class="lineno"> 205</span>  <span class="comment">// example:</span></div>
<div class="line"><a name="l00206"></a><span class="lineno"> 206</span>  <span class="comment">// 3 D : +12 -2 -33 : 1 +10 2</span></div>
<div class="line"><a name="l00207"></a><span class="lineno"> 207</span>  <span class="comment">// says that the clause with the id 3 consists of the literals +12, -2, -33,</span></div>
<div class="line"><a name="l00208"></a><span class="lineno"> 208</span>  <span class="comment">// and was derived by resolution between the clauses with ids 1 and 2,</span></div>
<div class="line"><a name="l00209"></a><span class="lineno"> 209</span>  <span class="comment">// where the literal +10 is in clause 1 and -10 is in clause 2.</span></div>
<div class="line"><a name="l00210"></a><span class="lineno"> 210</span>  <span class="comment">//</span></div>
<div class="line"><a name="l00211"></a><span class="lineno"> 211</span>  <span class="comment">// for example, 1 may be the clause +12 +10 -2, and 2 may be -10 -2 -33,</span></div>
<div class="line"><a name="l00212"></a><span class="lineno"> 212</span>  <span class="comment">// which resolved on +10 yield the clause +12 -2 -2 -33,</span></div>
<div class="line"><a name="l00213"></a><span class="lineno"> 213</span>  <span class="comment">// which after factoring simplified to +12 -2 -33.</span></div>
<div class="line"><a name="l00214"></a><span class="lineno"> 214</span>  <span class="keywordtype">void</span> <a class="code" href="classMiniSat_1_1Derivation.html#aec406575f21e97084cffa7c05b566833">printDerivation</a>(<a class="code" href="classMiniSat_1_1Clause.html">Clause</a>* clause);</div>
<div class="line"><a name="l00215"></a><span class="lineno"> 215</span> </div>
<div class="line"><a name="l00216"></a><span class="lineno"> 216</span>  <span class="comment">// print the derivation of the empty clause.</span></div>
<div class="line"><a name="l00217"></a><span class="lineno"> 217</span>  <span class="keywordtype">void</span> <a class="code" href="classMiniSat_1_1Derivation.html#aec406575f21e97084cffa7c05b566833">printDerivation</a>();</div>
<div class="line"><a name="l00218"></a><span class="lineno"> 218</span> </div>
<div class="line"><a name="l00219"></a><span class="lineno"> 219</span>  <span class="comment">// for debugging only</span></div>
<div class="line"><a name="l00220"></a><span class="lineno"> 220</span>  <span class="keywordtype">void</span> <a class="code" href="classMiniSat_1_1Derivation.html#ac419e5de02d38bdc729487c82fa93de2">checkDerivation</a>(<a class="code" href="classMiniSat_1_1Clause.html">Clause</a>* clause);</div>
<div class="line"><a name="l00221"></a><span class="lineno"> 221</span> </div>
<div class="line"><a name="l00222"></a><span class="lineno"> 222</span>  <span class="comment">// creates a new proof; ownership transferred to caller</span></div>
<div class="line"><a name="l00223"></a><span class="lineno"> 223</span>  <a class="code" href="classSAT_1_1SatProof.html">SAT::SatProof</a>* <a class="code" href="classMiniSat_1_1Derivation.html#a5436a42caaab1bf37d9355c5bd43d251">createProof</a>();</div>
<div class="line"><a name="l00224"></a><span class="lineno"> 224</span>  <a class="code" href="classSAT_1_1SatProof.html">SAT::SatProof</a>* <a class="code" href="classMiniSat_1_1Derivation.html#a5436a42caaab1bf37d9355c5bd43d251">createProof</a>(<a class="code" href="classMiniSat_1_1Clause.html">Clause</a>* clause);</div>
<div class="line"><a name="l00225"></a><span class="lineno"> 225</span> </div>
<div class="line"><a name="l00226"></a><span class="lineno"> 226</span>  <span class="comment">// see Solver::push - clauseID is the highest currently used clause id</span></div>
<div class="line"><a name="l00227"></a><span class="lineno"> 227</span>  <span class="keywordtype">void</span> <a class="code" href="classMiniSat_1_1Derivation.html#a9b35e97fb7ff5de171eeb68bfe4dda6b">push</a>(<span class="keywordtype">int</span> clauseID);</div>
<div class="line"><a name="l00228"></a><span class="lineno"> 228</span> </div>
<div class="line"><a name="l00229"></a><span class="lineno"> 229</span>  <span class="comment">// see Solver::pop - clauseID corresponds to a clause id used in a push</span></div>
<div class="line"><a name="l00230"></a><span class="lineno"> 230</span>  <span class="keywordtype">void</span> <a class="code" href="classMiniSat_1_1Derivation.html#af3782033a2412734e9a018877f71ce5d">pop</a>(<span class="keywordtype">int</span> clauseID);</div>
<div class="line"><a name="l00231"></a><span class="lineno"> 231</span>  };</div>
<div class="line"><a name="l00232"></a><span class="lineno"> 232</span> }</div>
<div class="line"><a name="l00233"></a><span class="lineno"> 233</span> </div>
<div class="line"><a name="l00234"></a><span class="lineno"> 234</span> </div>
<div class="line"><a name="l00235"></a><span class="lineno"> 235</span> <span class="preprocessor">#endif</span></div>
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