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<h1>source/ConstraintProblem.cpp</h1><div class="fragment"><pre class="fragment"><a name="l00001"></a>00001 <span class="preprocessor">#include "ConstraintProblem.h"</span>
<a name="l00002"></a>00002
<a name="l00003"></a>00003 <span class="preprocessor">#include "LinearProblem.h"</span>
<a name="l00004"></a>00004
<a name="l00005"></a>00005 <span class="preprocessor">#include <iostream></span>
<a name="l00006"></a>00006 <span class="preprocessor">#include <glpk.h></span>
<a name="l00007"></a>00007 <span class="preprocessor">#include "log.h"</span>
<a name="l00008"></a>00008
<a name="l00009"></a>00009 <span class="keyword">using</span> std::endl;
<a name="l00010"></a>00010
<a name="l00011"></a>00011 <span class="keyword">namespace </span>boa {
<a name="l00012"></a>00012
<a name="l00013"></a>00013 <span class="comment"></span>
<a name="l00014"></a>00014 <span class="comment">/**</span>
<a name="l00015"></a>00015 <span class="comment"> * A printing function for GLPK.</span>
<a name="l00016"></a>00016 <span class="comment"> *</span>
<a name="l00017"></a>00017 <span class="comment"> * @see { glpk.pdf / glp_term_hook }</span>
<a name="l00018"></a>00018 <span class="comment"> */</span>
<a name="l00019"></a>00019 <span class="keyword">static</span> <span class="keywordtype">int</span> printToLog(<span class="keywordtype">void</span> *info, <span class="keyword">const</span> <span class="keywordtype">char</span> *s) {
<a name="l00020"></a>00020 log::os() << s;
<a name="l00021"></a>00021 <span class="keywordflow">return</span> 1; <span class="comment">// Non zero.</span>
<a name="l00022"></a>00022 }
<a name="l00023"></a>00023
<a name="l00024"></a>00024 set<string> ConstraintProblem::CollectVars()<span class="keyword"> const </span>{
<a name="l00025"></a>00025 set<string> vars;
<a name="l00026"></a>00026 <span class="keywordflow">for</span> (set<Buffer>::const_iterator buffer = buffers_.begin(); buffer != buffers_.end(); ++buffer) {
<a name="l00027"></a>00027 vars.insert(buffer->NameExpression(VarLiteral::MIN, VarLiteral::USED));
<a name="l00028"></a>00028 vars.insert(buffer->NameExpression(VarLiteral::MAX, VarLiteral::USED));
<a name="l00029"></a>00029 vars.insert(buffer->NameExpression(VarLiteral::MIN, VarLiteral::ALLOC));
<a name="l00030"></a>00030 vars.insert(buffer->NameExpression(VarLiteral::MAX, VarLiteral::ALLOC));
<a name="l00031"></a>00031 }
<a name="l00032"></a>00032
<a name="l00033"></a>00033 <span class="keywordflow">for</span> (vector<Constraint>::const_iterator constraint = constraints_.begin();
<a name="l00034"></a>00034 constraint != constraints_.end();
<a name="l00035"></a>00035 ++constraint) {
<a name="l00036"></a>00036 constraint->GetVars(vars);
<a name="l00037"></a>00037 }
<a name="l00038"></a>00038 <span class="keywordflow">return</span> vars;
<a name="l00039"></a>00039 }
<a name="l00040"></a>00040
<a name="l00041"></a>00041
<a name="l00042"></a>00042 <span class="keyword">inline</span> <span class="keyword">static</span> <span class="keywordtype">void</span> MapVarToCol(<span class="keyword">const</span> set<string>& vars, map<string, int>& varToCol <span class="comment">/* out */</span>,
<a name="l00043"></a>00043 map<int, string>& colToVar <span class="comment">/* out */</span>) {
<a name="l00044"></a>00044 <span class="keywordtype">int</span> col = 1;
<a name="l00045"></a>00045 <span class="keywordflow">for</span> (set<string>::const_iterator var = vars.begin(); var != vars.end(); ++var, ++col) {
<a name="l00046"></a>00046 varToCol[*var] = col;
<a name="l00047"></a>00047 colToVar[col] = *var;
<a name="l00048"></a>00048 }
<a name="l00049"></a>00049 }
<a name="l00050"></a>00050
<a name="l00051"></a><a class="code" href="classboa_1_1ConstraintProblem.html#a89906278f9c580dcc86adf95f87d2a9a">00051</a> vector<Buffer> <a class="code" href="classboa_1_1ConstraintProblem.html#a89906278f9c580dcc86adf95f87d2a9a">ConstraintProblem::Solve</a>()<span class="keyword"> const </span>{
<a name="l00052"></a>00052 LOG << <span class="stringliteral">"Solving constraint problem ("</span> << constraints_.size() << <span class="stringliteral">" constraints)"</span> << endl;
<a name="l00053"></a>00053
<a name="l00054"></a>00054 vector<Buffer> emptySet;
<a name="l00055"></a>00055 <span class="keywordflow">if</span> (buffers_.empty()) {
<a name="l00056"></a>00056 LOG << <span class="stringliteral">"No buffers"</span> << endl;
<a name="l00057"></a>00057 <span class="keywordflow">return</span> emptySet;
<a name="l00058"></a>00058 }
<a name="l00059"></a>00059 <span class="keywordflow">if</span> (constraints_.empty()) {
<a name="l00060"></a>00060 LOG << <span class="stringliteral">"No constraints"</span> << endl;
<a name="l00061"></a>00061 <span class="keywordflow">return</span> emptySet;
<a name="l00062"></a>00062 }
<a name="l00063"></a>00063
<a name="l00064"></a>00064 <span class="keywordflow">return</span> SolveProblem(MakeFeasableProblem());
<a name="l00065"></a>00065 }
<a name="l00066"></a>00066
<a name="l00067"></a>00067 <span class="keyword">inline</span> <span class="keywordtype">void</span> setBufferCoef(<a class="code" href="classboa_1_1LinearProblem.html">LinearProblem</a> &p, <span class="keyword">const</span> <a class="code" href="classboa_1_1Buffer.html">Buffer</a> &b, <span class="keywordtype">double</span> base) {
<a name="l00068"></a>00068 glp_set_obj_coef(p.lp_, p.varToCol_[b.NameExpression(VarLiteral::MIN, VarLiteral::USED )], base);
<a name="l00069"></a>00069 glp_set_obj_coef(p.lp_, p.varToCol_[b.NameExpression(VarLiteral::MAX, VarLiteral::USED )], -base);
<a name="l00070"></a>00070 glp_set_obj_coef(p.lp_, p.varToCol_[b.NameExpression(VarLiteral::MIN, VarLiteral::ALLOC)], base);
<a name="l00071"></a>00071 glp_set_obj_coef(p.lp_, p.varToCol_[b.NameExpression(VarLiteral::MAX, VarLiteral::ALLOC)], -base);
<a name="l00072"></a>00072 }
<a name="l00073"></a>00073
<a name="l00074"></a>00074 LinearProblem ConstraintProblem::MakeFeasableProblem()<span class="keyword"> const </span>{
<a name="l00075"></a>00075 set<string> vars = CollectVars();
<a name="l00076"></a>00076 LinearProblem lp;
<a name="l00077"></a>00077 MapVarToCol(vars, lp.varToCol_, lp.colToVar_);
<a name="l00078"></a>00078
<a name="l00079"></a>00079 glp_set_obj_dir(lp.lp_, GLP_MAX);
<a name="l00080"></a>00080 glp_add_cols(lp.lp_, vars.size());
<a name="l00081"></a>00081 glp_add_rows(lp.lp_, constraints_.size());
<a name="l00082"></a>00082 {
<a name="l00083"></a>00083 <span class="comment">// Fill matrix</span>
<a name="l00084"></a>00084 <span class="keywordtype">int</span> row = 1;
<a name="l00085"></a>00085 <span class="keywordflow">for</span> (vector<Constraint>::const_iterator c = constraints_.begin(); c != constraints_.end(); ++c) {
<a name="l00086"></a>00086 <span class="keywordflow">if</span> (c->GetType() == Constraint::STRUCTURAL) {
<a name="l00087"></a>00087 c->AddToLPP(lp.lp_, row, lp.varToCol_);
<a name="l00088"></a>00088 ++row;
<a name="l00089"></a>00089 }
<a name="l00090"></a>00090 }
<a name="l00091"></a>00091 lp.structuralRows_ = row - 1;
<a name="l00092"></a>00092 <span class="keywordflow">for</span> (vector<Constraint>::const_iterator c = constraints_.begin(); c != constraints_.end(); ++c) {
<a name="l00093"></a>00093 <span class="keywordflow">if</span> (c->GetType() == Constraint::ALIASING) {
<a name="l00094"></a>00094 c->AddToLPP(lp.lp_, row, lp.varToCol_);
<a name="l00095"></a>00095 ++row;
<a name="l00096"></a>00096 }
<a name="l00097"></a>00097 }
<a name="l00098"></a>00098 lp.aliasingRows_ = (row - 1) - lp.structuralRows_;
<a name="l00099"></a>00099 for (vector<Constraint>::const_iterator c = constraints_.begin(); c != constraints_.end(); ++c) {
<a name="l00100"></a>00100 <span class="keywordflow">if</span> (c->GetType() == Constraint::NORMAL) {
<a name="l00101"></a>00101 c->AddToLPP(lp.lp_, row, lp.varToCol_);
<a name="l00102"></a>00102 ++row;
<a name="l00103"></a>00103 }
<a name="l00104"></a>00104 }
<a name="l00105"></a>00105 lp.realRows_ = row - lp.structuralRows_ - 1;
<a name="l00106"></a>00106 }
<a name="l00107"></a>00107
<a name="l00108"></a>00108 <span class="keywordflow">for</span> (<span class="keywordtype">size_t</span> i = 1; i <= vars.size(); ++i) {
<a name="l00109"></a>00109 glp_set_col_bnds(lp.lp_, i, GLP_FR, 0.0, 0.0);
<a name="l00110"></a>00110 }
<a name="l00111"></a>00111
<a name="l00112"></a>00112 <span class="keywordflow">for</span> (set<Buffer>::const_iterator b = buffers_.begin(); b != buffers_.end(); ++b) {
<a name="l00113"></a>00113 <span class="comment">// Set objective coeficients</span>
<a name="l00114"></a>00114 setBufferCoef(lp, *b, 1.0);
<a name="l00115"></a>00115 }
<a name="l00116"></a>00116
<a name="l00117"></a>00117 glp_smcp params;
<a name="l00118"></a>00118 glp_init_smcp(&params);
<a name="l00119"></a>00119 glp_term_hook(&printToLog, NULL);
<a name="l00120"></a>00120 <span class="keywordflow">if</span> (outputGlpk_) {
<a name="l00121"></a>00121 params.msg_lev = GLP_MSG_ALL;
<a name="l00122"></a>00122 } <span class="keywordflow">else</span> {
<a name="l00123"></a>00123 params.msg_lev = GLP_MSG_ERR;
<a name="l00124"></a>00124 }
<a name="l00125"></a>00125 lp.SetParams(params);
<a name="l00126"></a>00126
<a name="l00127"></a>00127 <span class="keywordtype">int</span> status = lp.Solve();
<a name="l00128"></a>00128 <span class="keywordflow">while</span> (status != GLP_OPT) {
<a name="l00129"></a>00129 <span class="keywordflow">while</span> (status == GLP_UNBND) {
<a name="l00130"></a>00130 <span class="keywordflow">for</span> (set<Buffer>::const_iterator b = buffers_.begin(); b != buffers_.end(); ++b) {
<a name="l00131"></a>00131 setBufferCoef(lp, *b, 0.0);
<a name="l00132"></a>00132 }
<a name="l00133"></a>00133
<a name="l00134"></a>00134 <span class="keywordflow">for</span> (set<Buffer>::const_iterator b = buffers_.begin(); b != buffers_.end(); ++b) {
<a name="l00135"></a>00135 setBufferCoef(lp, *b, 1.0);
<a name="l00136"></a>00136 status = lp.Solve();
<a name="l00137"></a>00137 <span class="keywordflow">if</span> (status == GLP_UNBND) {
<a name="l00138"></a>00138 setBufferCoef(lp, *b, 0.0);
<a name="l00139"></a>00139 }
<a name="l00140"></a>00140 }
<a name="l00141"></a>00141 status = lp.Solve();
<a name="l00142"></a>00142 }
<a name="l00143"></a>00143 <span class="keywordflow">while</span> ((status == GLP_INFEAS) || (status == GLP_NOFEAS)) {
<a name="l00144"></a>00144 lp.RemoveInfeasable();
<a name="l00145"></a>00145 status = lp.Solve();
<a name="l00146"></a>00146 }
<a name="l00147"></a>00147 }
<a name="l00148"></a>00148
<a name="l00149"></a>00149 <span class="keywordflow">return</span> lp;
<a name="l00150"></a>00150 }
<a name="l00151"></a>00151
<a name="l00152"></a>00152 vector<Buffer> ConstraintProblem::SolveProblem(LinearProblem lp)<span class="keyword"> const </span>{
<a name="l00153"></a>00153 vector<Buffer> unsafeBuffers;
<a name="l00154"></a>00154
<a name="l00155"></a>00155 <span class="keywordflow">for</span> (set<Buffer>::const_iterator buffer = buffers_.begin(); buffer != buffers_.end(); ++buffer) {
<a name="l00156"></a>00156 <span class="comment">// Print result</span>
<a name="l00157"></a>00157 LOG << buffer->getReadableName() << <span class="stringliteral">" "</span> << buffer->getSourceLocation() << endl;
<a name="l00158"></a>00158 LOG << <span class="stringliteral">" Used min\t = "</span> << glp_get_col_prim(
<a name="l00159"></a>00159 lp.lp_, lp.varToCol_[buffer->NameExpression(VarLiteral::MIN, VarLiteral::USED)]) << endl;
<a name="l00160"></a>00160 LOG << <span class="stringliteral">" Used max\t = "</span> << glp_get_col_prim(
<a name="l00161"></a>00161 lp.lp_, lp.varToCol_[buffer->NameExpression(VarLiteral::MAX, VarLiteral::USED)]) << endl;
<a name="l00162"></a>00162 LOG << <span class="stringliteral">" Alloc min\t = "</span> << glp_get_col_prim(
<a name="l00163"></a>00163 lp.lp_, lp.varToCol_[buffer->NameExpression(VarLiteral::MIN, VarLiteral::ALLOC)]) << endl;
<a name="l00164"></a>00164 LOG << <span class="stringliteral">" Alloc max\t = "</span> << glp_get_col_prim(
<a name="l00165"></a>00165 lp.lp_, lp.varToCol_[buffer->NameExpression(VarLiteral::MAX, VarLiteral::ALLOC)]) << endl;
<a name="l00166"></a>00166
<a name="l00167"></a>00167 LOG << endl;
<a name="l00168"></a>00168 <span class="keywordflow">if</span> ((glp_get_col_prim(
<a name="l00169"></a>00169 lp.lp_, lp.varToCol_[buffer->NameExpression(VarLiteral::MAX, VarLiteral::USED)]) >=
<a name="l00170"></a>00170 glp_get_col_prim(
<a name="l00171"></a>00171 lp.lp_, lp.varToCol_[buffer->NameExpression(VarLiteral::MIN, VarLiteral::ALLOC)])) ||
<a name="l00172"></a>00172 (glp_get_col_prim(
<a name="l00173"></a>00173 lp.lp_, lp.varToCol_[buffer->NameExpression(VarLiteral::MIN, VarLiteral::USED)]) < 0)) {
<a name="l00174"></a>00174 unsafeBuffers.push_back(*buffer);
<a name="l00175"></a>00175 }
<a name="l00176"></a>00176 }
<a name="l00177"></a>00177
<a name="l00178"></a>00178 <span class="keywordflow">return</span> unsafeBuffers;
<a name="l00179"></a>00179 }
<a name="l00180"></a>00180
<a name="l00181"></a>00181 vector<string> ConstraintProblem::Blame(LinearProblem lp, Buffer &buffer)<span class="keyword"> const </span>{
<a name="l00182"></a>00182 vector<string> result;
<a name="l00183"></a>00183
<a name="l00184"></a>00184 <span class="keywordtype">double</span> minAlloc = glp_get_col_prim(lp.lp_,
<a name="l00185"></a>00185 lp.varToCol_[buffer.NameExpression(VarLiteral::MIN, VarLiteral::ALLOC)]) - 1;
<a name="l00186"></a>00186 glp_set_col_bnds(lp.lp_, lp.varToCol_[buffer.NameExpression(VarLiteral::MAX, VarLiteral::USED)],
<a name="l00187"></a>00187 GLP_UP, minAlloc, minAlloc);
<a name="l00188"></a>00188 glp_set_col_bnds(lp.lp_, lp.varToCol_[buffer.NameExpression(VarLiteral::MIN, VarLiteral::USED)],
<a name="l00189"></a>00189 GLP_LO, 0.0, 0.0);
<a name="l00190"></a>00190
<a name="l00191"></a>00191 lp.Solve();
<a name="l00192"></a>00192
<a name="l00193"></a>00193 <span class="comment">// blame the interesting rows first</span>
<a name="l00194"></a>00194 lp.structuralRows_ += lp.aliasingRows_;
<a name="l00195"></a>00195 lp.realRows_ = glp_get_num_rows(lp.lp_) - lp.structuralRows_;
<a name="l00196"></a>00196 vector<int> rows = lp.ElasticFilter();
<a name="l00197"></a>00197 <span class="keywordflow">for</span> (<span class="keywordtype">size_t</span> i = 0; i < rows.size(); ++i) {
<a name="l00198"></a>00198 <span class="keywordtype">char</span> <span class="keyword">const</span> *row = glp_get_row_name(lp.lp_, rows[i]);
<a name="l00199"></a>00199 <span class="keywordflow">if</span> (row) {
<a name="l00200"></a>00200 result.push_back(row);
<a name="l00201"></a>00201 }
<a name="l00202"></a>00202 }
<a name="l00203"></a>00203
<a name="l00204"></a>00204 <span class="comment">// then aliasing rows too</span>
<a name="l00205"></a>00205 lp.structuralRows_ -= lp.aliasingRows_;
<a name="l00206"></a>00206 lp.realRows_ = lp.aliasingRows_;
<a name="l00207"></a>00207 rows = lp.ElasticFilter();
<a name="l00208"></a>00208 <span class="keywordflow">for</span> (<span class="keywordtype">size_t</span> i = 0; i < rows.size(); ++i) {
<a name="l00209"></a>00209 <span class="keywordtype">char</span> <span class="keyword">const</span> *row = glp_get_row_name(lp.lp_, rows[i]);
<a name="l00210"></a>00210 <span class="keywordflow">if</span> (row) {
<a name="l00211"></a>00211 result.push_back(row);
<a name="l00212"></a>00212 }
<a name="l00213"></a>00213 }
<a name="l00214"></a>00214 <span class="keywordflow">return</span> result;
<a name="l00215"></a>00215 }
<a name="l00216"></a>00216
<a name="l00217"></a><a class="code" href="classboa_1_1ConstraintProblem.html#afb4825c5bf44f112f046f9d93bbdbf3f">00217</a> map<Buffer, vector<string> > <a class="code" href="classboa_1_1ConstraintProblem.html#afb4825c5bf44f112f046f9d93bbdbf3f">ConstraintProblem::SolveAndBlame</a>()<span class="keyword"> const </span>{
<a name="l00218"></a>00218 <a class="code" href="classboa_1_1LinearProblem.html">LinearProblem</a> lp = MakeFeasableProblem();
<a name="l00219"></a>00219 vector<Buffer> unsafe = SolveProblem(lp);
<a name="l00220"></a>00220 map<Buffer, vector<string> > result;
<a name="l00221"></a>00221 <span class="keywordflow">for</span> (<span class="keywordtype">size_t</span> i = 0; i < unsafe.size(); ++i) {
<a name="l00222"></a>00222 result[unsafe[i]] = Blame(lp, unsafe[i]);
<a name="l00223"></a>00223 }
<a name="l00224"></a>00224 <span class="keywordflow">return</span> result;
<a name="l00225"></a>00225 }
<a name="l00226"></a>00226 } <span class="comment">// namespace boa</span>
</pre></div></div>
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