1 | /* |
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2 | * This file is part of the Cforall project |
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3 | * |
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4 | * $Id: AlternativeFinder.cc,v 1.36 2005/08/29 20:14:15 rcbilson Exp $ |
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5 | * |
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6 | */ |
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7 | |
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8 | #include <list> |
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9 | #include <iterator> |
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10 | #include <algorithm> |
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11 | #include <functional> |
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12 | #include <cassert> |
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13 | |
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14 | #include "AlternativeFinder.h" |
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15 | #include "Alternative.h" |
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16 | #include "Cost.h" |
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17 | #include "typeops.h" |
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18 | #include "Unify.h" |
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19 | #include "RenameVars.h" |
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20 | #include "SynTree/Type.h" |
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21 | #include "SynTree/Declaration.h" |
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22 | #include "SynTree/Expression.h" |
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23 | #include "SynTree/Initializer.h" |
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24 | #include "SynTree/Visitor.h" |
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25 | #include "SymTab/Indexer.h" |
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26 | #include "SymTab/Mangler.h" |
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27 | #include "SynTree/TypeSubstitution.h" |
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28 | #include "SymTab/Validate.h" |
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29 | #include "Designators/Processor.h" |
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30 | #include "Tuples/TupleAssignment.h" |
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31 | #include "Tuples/NameMatcher.h" |
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32 | #include "utility.h" |
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33 | |
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34 | |
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35 | //#define DEBUG_COST |
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36 | |
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37 | namespace ResolvExpr { |
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38 | |
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39 | Expression * |
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40 | resolveInVoidContext( Expression *expr, const SymTab::Indexer &indexer, TypeEnvironment &env ) |
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41 | { |
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42 | CastExpr *castToVoid = new CastExpr( expr ); |
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43 | |
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44 | AlternativeFinder finder( indexer, env ); |
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45 | finder.findWithAdjustment( castToVoid ); |
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46 | |
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47 | // it's a property of the language that a cast expression has either 1 or 0 interpretations; |
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48 | // if it has 0 interpretations, an exception has already been thrown. |
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49 | assert( finder.get_alternatives().size() == 1 ); |
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50 | CastExpr *newExpr = dynamic_cast< CastExpr* >( finder.get_alternatives().front().expr ); |
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51 | assert( newExpr ); |
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52 | env = finder.get_alternatives().front().env; |
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53 | return newExpr->get_arg()->clone(); |
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54 | } |
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55 | |
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56 | namespace { |
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57 | |
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58 | void |
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59 | printAlts( const AltList &list, std::ostream &os, int indent = 0 ) |
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60 | { |
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61 | for( AltList::const_iterator i = list.begin(); i != list.end(); ++i ) { |
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62 | i->print( os, indent ); |
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63 | os << std::endl; |
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64 | } |
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65 | } |
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66 | |
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67 | void |
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68 | makeExprList( const AltList &in, std::list< Expression* > &out ) |
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69 | { |
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70 | for( AltList::const_iterator i = in.begin(); i != in.end(); ++i ) { |
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71 | out.push_back( i->expr->clone() ); |
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72 | } |
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73 | } |
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74 | |
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75 | Cost |
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76 | sumCost( const AltList &in ) |
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77 | { |
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78 | Cost total; |
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79 | for( AltList::const_iterator i = in.begin(); i != in.end(); ++i ) { |
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80 | total += i->cost; |
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81 | } |
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82 | return total; |
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83 | } |
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84 | |
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85 | struct PruneStruct |
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86 | { |
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87 | bool isAmbiguous; |
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88 | AltList::iterator candidate; |
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89 | PruneStruct() {} |
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90 | PruneStruct( AltList::iterator candidate ): isAmbiguous( false ), candidate( candidate ) {} |
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91 | }; |
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92 | |
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93 | template< typename InputIterator, typename OutputIterator > |
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94 | void |
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95 | pruneAlternatives( InputIterator begin, InputIterator end, OutputIterator out, const SymTab::Indexer &indexer ) |
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96 | { |
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97 | // select the alternatives that have the minimum conversion cost for a particular set of result types |
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98 | std::map< std::string, PruneStruct > selected; |
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99 | for( AltList::iterator candidate = begin; candidate != end; ++candidate ) { |
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100 | PruneStruct current( candidate ); |
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101 | std::string mangleName; |
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102 | for( std::list< Type* >::const_iterator retType = candidate->expr->get_results().begin(); retType != candidate->expr->get_results().end(); ++retType ) { |
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103 | Type *newType = (*retType)->clone(); |
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104 | candidate->env.apply( newType ); |
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105 | mangleName += SymTab::Mangler::mangle( newType ); |
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106 | delete newType; |
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107 | } |
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108 | std::map< std::string, PruneStruct >::iterator mapPlace = selected.find( mangleName ); |
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109 | if( mapPlace != selected.end() ) { |
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110 | if( candidate->cost < mapPlace->second.candidate->cost ) { |
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111 | /// std::cout << "cost " << candidate->cost << " beats " << target->second.cost << std::endl; |
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112 | selected[ mangleName ] = current; |
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113 | } else if( candidate->cost == mapPlace->second.candidate->cost ) { |
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114 | /// std::cout << "marking ambiguous" << std::endl; |
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115 | mapPlace->second.isAmbiguous = true; |
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116 | } |
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117 | } else { |
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118 | selected[ mangleName ] = current; |
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119 | } |
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120 | } |
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121 | |
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122 | /// std::cout << "there are " << selected.size() << " alternatives before elimination" << std::endl; |
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123 | |
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124 | // accept the alternatives that were unambiguous |
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125 | for( std::map< std::string, PruneStruct >::iterator target = selected.begin(); target != selected.end(); ++target) { |
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126 | if( !target->second.isAmbiguous ) { |
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127 | Alternative &alt = *target->second.candidate; |
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128 | for( std::list< Type* >::iterator result = alt.expr->get_results().begin(); result != alt.expr->get_results().end(); ++result ) { |
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129 | alt.env.applyFree( *result ); |
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130 | } |
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131 | *out++ = alt; |
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132 | } |
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133 | } |
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134 | |
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135 | } |
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136 | |
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137 | template< typename InputIterator, typename OutputIterator > |
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138 | void |
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139 | findMinCost( InputIterator begin, InputIterator end, OutputIterator out ) |
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140 | { |
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141 | AltList alternatives; |
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142 | |
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143 | // select the alternatives that have the minimum parameter cost |
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144 | Cost minCost = Cost::infinity; |
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145 | for( AltList::iterator i = begin; i != end; ++i ) { |
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146 | if( i->cost < minCost ) { |
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147 | minCost = i->cost; |
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148 | i->cost = i->cvtCost; |
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149 | alternatives.clear(); |
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150 | alternatives.push_back( *i ); |
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151 | } else if( i->cost == minCost ) { |
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152 | i->cost = i->cvtCost; |
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153 | alternatives.push_back( *i ); |
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154 | } |
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155 | } |
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156 | std::copy( alternatives.begin(), alternatives.end(), out ); |
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157 | } |
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158 | |
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159 | template< typename InputIterator > |
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160 | void |
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161 | simpleCombineEnvironments( InputIterator begin, InputIterator end, TypeEnvironment &result ) |
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162 | { |
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163 | while( begin != end ) { |
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164 | result.simpleCombine( (*begin++).env ); |
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165 | } |
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166 | } |
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167 | |
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168 | void |
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169 | renameTypes( Expression *expr ) |
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170 | { |
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171 | for( std::list< Type* >::iterator i = expr->get_results().begin(); i != expr->get_results().end(); ++i ) { |
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172 | (*i)->accept( global_renamer ); |
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173 | } |
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174 | } |
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175 | } |
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176 | |
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177 | template< typename InputIterator, typename OutputIterator > |
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178 | void |
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179 | AlternativeFinder::findSubExprs( InputIterator begin, InputIterator end, OutputIterator out ) |
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180 | { |
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181 | while( begin != end ) { |
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182 | AlternativeFinder finder( indexer, env ); |
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183 | finder.findWithAdjustment( *begin ); |
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184 | // XXX either this |
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185 | //Designators::fixDesignations( finder, (*begin++)->get_argName() ); |
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186 | // or XXX this |
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187 | begin++; |
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188 | /// std::cout << "findSubExprs" << std::endl; |
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189 | /// printAlts( finder.alternatives, std::cout ); |
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190 | *out++ = finder; |
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191 | } |
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192 | } |
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193 | |
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194 | AlternativeFinder::AlternativeFinder( const SymTab::Indexer &indexer, const TypeEnvironment &env ) |
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195 | : indexer( indexer ), env( env ) |
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196 | { |
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197 | } |
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198 | |
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199 | void |
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200 | AlternativeFinder::find( Expression *expr, bool adjust ) |
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201 | { |
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202 | expr->accept( *this ); |
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203 | if( alternatives.empty() ) { |
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204 | throw SemanticError( "No reasonable alternatives for expression ", expr ); |
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205 | } |
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206 | for( AltList::iterator i = alternatives.begin(); i != alternatives.end(); ++i ) { |
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207 | if( adjust ) { |
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208 | adjustExprTypeList( i->expr->get_results().begin(), i->expr->get_results().end(), i->env, indexer ); |
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209 | } |
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210 | } |
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211 | /// std::cout << "alternatives before prune:" << std::endl; |
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212 | /// printAlts( alternatives, std::cout ); |
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213 | AltList::iterator oldBegin = alternatives.begin(); |
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214 | pruneAlternatives( alternatives.begin(), alternatives.end(), front_inserter( alternatives ), indexer ); |
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215 | if( alternatives.begin() == oldBegin ) { |
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216 | std::ostrstream stream; |
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217 | stream << "Can't choose between alternatives for expression "; |
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218 | expr->print( stream ); |
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219 | stream << "Alternatives are:"; |
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220 | AltList winners; |
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221 | findMinCost( alternatives.begin(), alternatives.end(), back_inserter( winners ) ); |
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222 | printAlts( winners, stream, 8 ); |
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223 | throw SemanticError( std::string( stream.str(), stream.pcount() ) ); |
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224 | } |
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225 | alternatives.erase( oldBegin, alternatives.end() ); |
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226 | /// std::cout << "there are " << alternatives.size() << " alternatives after elimination" << std::endl; |
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227 | } |
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228 | |
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229 | void |
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230 | AlternativeFinder::findWithAdjustment( Expression *expr ) |
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231 | { |
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232 | find( expr, true ); |
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233 | } |
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234 | |
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235 | template< typename StructOrUnionType > |
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236 | void |
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237 | AlternativeFinder::addAggMembers( StructOrUnionType *aggInst, Expression *expr, const Cost &newCost, const std::string &name ) |
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238 | { |
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239 | std::list< Declaration* > members; |
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240 | aggInst->lookup( name, members ); |
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241 | for( std::list< Declaration* >::const_iterator i = members.begin(); i != members.end(); ++i ) { |
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242 | if( DeclarationWithType *dwt = dynamic_cast< DeclarationWithType* >( *i ) ) { |
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243 | alternatives.push_back( Alternative( new MemberExpr( dwt->clone(), expr->clone() ), env, newCost ) ); |
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244 | renameTypes( alternatives.back().expr ); |
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245 | } else { |
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246 | assert( false ); |
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247 | } |
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248 | } |
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249 | } |
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250 | |
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251 | void |
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252 | AlternativeFinder::visit(ApplicationExpr *applicationExpr) |
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253 | { |
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254 | alternatives.push_back( Alternative( applicationExpr->clone(), env, Cost::zero ) ); |
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255 | } |
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256 | |
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257 | Cost |
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258 | computeConversionCost( Alternative &alt, const SymTab::Indexer &indexer ) |
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259 | { |
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260 | ApplicationExpr *appExpr = dynamic_cast< ApplicationExpr* >( alt.expr ); |
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261 | assert( appExpr ); |
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262 | PointerType *pointer = dynamic_cast< PointerType* >( appExpr->get_function()->get_results().front() ); |
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263 | assert( pointer ); |
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264 | FunctionType *function = dynamic_cast< FunctionType* >( pointer->get_base() ); |
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265 | assert( function ); |
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266 | |
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267 | Cost convCost( 0, 0, 0 ); |
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268 | std::list< DeclarationWithType* >& formals = function->get_parameters(); |
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269 | std::list< DeclarationWithType* >::iterator formal = formals.begin(); |
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270 | std::list< Expression* >& actuals = appExpr->get_args(); |
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271 | for( std::list< Expression* >::iterator actualExpr = actuals.begin(); actualExpr != actuals.end(); ++actualExpr ) { |
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272 | /// std::cout << "actual expression:" << std::endl; |
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273 | /// (*actualExpr)->print( std::cout, 8 ); |
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274 | /// std::cout << "--- results are" << std::endl; |
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275 | /// printAll( (*actualExpr)->get_results(), std::cout, 8 ); |
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276 | std::list< DeclarationWithType* >::iterator startFormal = formal; |
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277 | Cost actualCost; |
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278 | for( std::list< Type* >::iterator actual = (*actualExpr)->get_results().begin(); actual != (*actualExpr)->get_results().end(); ++actual ) { |
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279 | if( formal == formals.end() ) { |
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280 | if( function->get_isVarArgs() ) { |
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281 | convCost += Cost( 1, 0, 0 ); |
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282 | break; |
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283 | } else { |
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284 | return Cost::infinity; |
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285 | } |
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286 | } |
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287 | /// std::cout << std::endl << "converting "; |
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288 | /// (*actual)->print( std::cout, 8 ); |
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289 | /// std::cout << std::endl << " to "; |
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290 | /// (*formal)->get_type()->print( std::cout, 8 ); |
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291 | Cost newCost = conversionCost( *actual, (*formal)->get_type(), indexer, alt.env ); |
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292 | /// std::cout << std::endl << "cost is" << newCost << std::endl; |
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293 | |
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294 | if( newCost == Cost::infinity ) { |
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295 | return newCost; |
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296 | } |
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297 | convCost += newCost; |
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298 | actualCost += newCost; |
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299 | |
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300 | convCost += Cost( 0, polyCost( (*formal)->get_type(), alt.env, indexer ) + polyCost( *actual, alt.env, indexer), 0 ); |
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301 | |
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302 | formal++; |
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303 | } |
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304 | if( actualCost != Cost( 0, 0, 0 ) ) { |
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305 | std::list< DeclarationWithType* >::iterator startFormalPlusOne = startFormal; |
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306 | startFormalPlusOne++; |
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307 | if( formal == startFormalPlusOne ) { |
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308 | // not a tuple type |
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309 | Type *newType = (*startFormal)->get_type()->clone(); |
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310 | alt.env.apply( newType ); |
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311 | *actualExpr = new CastExpr( *actualExpr, newType ); |
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312 | } else { |
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313 | TupleType *newType = new TupleType( Type::Qualifiers() ); |
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314 | for( std::list< DeclarationWithType* >::iterator i = startFormal; i != formal; ++i ) { |
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315 | newType->get_types().push_back( (*i)->get_type()->clone() ); |
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316 | } |
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317 | alt.env.apply( newType ); |
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318 | *actualExpr = new CastExpr( *actualExpr, newType ); |
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319 | } |
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320 | } |
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321 | |
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322 | } |
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323 | if( formal != formals.end() ) { |
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324 | return Cost::infinity; |
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325 | } |
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326 | |
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327 | for( InferredParams::const_iterator assert = appExpr->get_inferParams().begin(); assert != appExpr->get_inferParams().end(); ++assert ) { |
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328 | /// std::cout << std::endl << "converting "; |
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329 | /// assert->second.actualType->print( std::cout, 8 ); |
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330 | /// std::cout << std::endl << " to "; |
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331 | /// assert->second.formalType->print( std::cout, 8 ); |
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332 | Cost newCost = conversionCost( assert->second.actualType, assert->second.formalType, indexer, alt.env ); |
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333 | /// std::cout << std::endl << "cost of conversion is " << newCost << std::endl; |
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334 | if( newCost == Cost::infinity ) { |
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335 | return newCost; |
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336 | } |
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337 | convCost += newCost; |
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338 | |
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339 | convCost += Cost( 0, polyCost( assert->second.formalType, alt.env, indexer ) + polyCost( assert->second.actualType, alt.env, indexer), 0 ); |
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340 | } |
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341 | |
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342 | return convCost; |
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343 | } |
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344 | |
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345 | void |
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346 | makeUnifiableVars( Type *type, OpenVarSet &unifiableVars, AssertionSet &needAssertions ) |
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347 | { |
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348 | for( std::list< TypeDecl* >::const_iterator tyvar = type->get_forall().begin(); tyvar != type->get_forall().end(); ++tyvar ) { |
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349 | unifiableVars[ (*tyvar)->get_name() ] = (*tyvar)->get_kind(); |
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350 | for( std::list< DeclarationWithType* >::iterator assert = (*tyvar)->get_assertions().begin(); assert != (*tyvar)->get_assertions().end(); ++assert ) { |
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351 | needAssertions[ *assert ] = true; |
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352 | } |
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353 | /// needAssertions.insert( needAssertions.end(), (*tyvar)->get_assertions().begin(), (*tyvar)->get_assertions().end() ); |
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354 | } |
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355 | } |
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356 | |
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357 | bool |
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358 | AlternativeFinder::instantiateFunction( std::list< DeclarationWithType* >& formals, /*const*/ AltList &actuals, bool isVarArgs, OpenVarSet& openVars, TypeEnvironment &resultEnv, AssertionSet &resultNeed, AssertionSet &resultHave ) |
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359 | { |
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360 | std::list< TypeEnvironment > toBeDone; |
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361 | simpleCombineEnvironments( actuals.begin(), actuals.end(), resultEnv ); |
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362 | // make sure we don't widen any existing bindings |
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363 | for( TypeEnvironment::iterator i = resultEnv.begin(); i != resultEnv.end(); ++i ) { |
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364 | i->allowWidening = false; |
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365 | } |
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366 | resultEnv.extractOpenVars( openVars ); |
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367 | |
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368 | /* |
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369 | Tuples::NameMatcher matcher( formals ); |
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370 | try { |
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371 | matcher.match( actuals ); |
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372 | } catch ( Tuples::NoMatch &e ) { |
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373 | std::cerr << "Alternative doesn't match: " << e.message << std::endl; |
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374 | } |
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375 | */ |
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376 | std::list< DeclarationWithType* >::iterator formal = formals.begin(); |
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377 | for( AltList::const_iterator actualExpr = actuals.begin(); actualExpr != actuals.end(); ++actualExpr ) { |
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378 | for( std::list< Type* >::iterator actual = actualExpr->expr->get_results().begin(); actual != actualExpr->expr->get_results().end(); ++actual ) { |
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379 | if( formal == formals.end() ) { |
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380 | return isVarArgs; |
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381 | } |
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382 | /// std::cerr << "formal type is "; |
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383 | /// (*formal)->get_type()->print( std::cerr ); |
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384 | /// std::cerr << std::endl << "actual type is "; |
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385 | /// (*actual)->print( std::cerr ); |
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386 | /// std::cerr << std::endl; |
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387 | if( !unify( (*formal)->get_type(), *actual, resultEnv, resultNeed, resultHave, openVars, indexer ) ) { |
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388 | return false; |
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389 | } |
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390 | formal++; |
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391 | } |
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392 | } |
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393 | // Handling of default values |
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394 | while( formal != formals.end() ) { |
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395 | if( ObjectDecl *od = dynamic_cast<ObjectDecl *>( *formal ) ) |
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396 | if( SingleInit *si = dynamic_cast<SingleInit *>( od->get_init() )) |
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397 | // so far, only constant expressions are accepted as default values |
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398 | if ( ConstantExpr *cnstexpr = dynamic_cast<ConstantExpr *>(si->get_value()) ) |
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399 | if ( Constant *cnst = dynamic_cast<Constant *>( cnstexpr->get_constant() ) ) |
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400 | if( unify( (*formal)->get_type(), cnst->get_type(), resultEnv, resultNeed, resultHave, openVars, indexer ) ) { |
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401 | // XXX Don't know if this is right |
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402 | actuals.push_back( Alternative( cnstexpr->clone(), env, Cost::zero ) ); |
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403 | formal++; |
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404 | if (formal == formals.end()) break; |
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405 | } |
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406 | return false; |
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407 | } |
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408 | return true; |
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409 | } |
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410 | |
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411 | static const int recursionLimit = 10; |
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412 | |
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413 | void |
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414 | addToIndexer( AssertionSet &assertSet, SymTab::Indexer &indexer ) |
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415 | { |
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416 | for( AssertionSet::iterator i = assertSet.begin(); i != assertSet.end(); ++i ) { |
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417 | if( i->second == true ) { |
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418 | i->first->accept( indexer ); |
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419 | } |
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420 | } |
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421 | } |
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422 | |
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423 | template< typename ForwardIterator, typename OutputIterator > |
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424 | void |
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425 | inferRecursive( ForwardIterator begin, ForwardIterator end, const Alternative &newAlt, OpenVarSet &openVars, const SymTab::Indexer &decls, const AssertionSet &newNeed, int level, const SymTab::Indexer &indexer, OutputIterator out ) |
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426 | { |
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427 | if( begin == end ) { |
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428 | if( newNeed.empty() ) { |
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429 | *out++ = newAlt; |
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430 | return; |
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431 | } else if( level >= recursionLimit ) { |
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432 | throw SemanticError( "Too many recursive assertions" ); |
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433 | } else { |
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434 | AssertionSet newerNeed; |
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435 | /// std::cerr << "recursing with new set:" << std::endl; |
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436 | /// printAssertionSet( newNeed, std::cerr, 8 ); |
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437 | inferRecursive( newNeed.begin(), newNeed.end(), newAlt, openVars, decls, newerNeed, level+1, indexer, out ); |
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438 | return; |
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439 | } |
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440 | } |
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441 | |
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442 | ForwardIterator cur = begin++; |
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443 | if( !cur->second ) { |
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444 | inferRecursive( begin, end, newAlt, openVars, decls, newNeed, level, indexer, out ); |
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445 | } |
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446 | DeclarationWithType *curDecl = cur->first; |
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447 | /// std::cerr << "inferRecursive: assertion is "; |
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448 | /// curDecl->print( std::cerr ); |
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449 | /// std::cerr << std::endl; |
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450 | std::list< DeclarationWithType* > candidates; |
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451 | decls.lookupId( curDecl->get_name(), candidates ); |
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452 | /// if( candidates.empty() ) { std::cout << "no candidates!" << std::endl; } |
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453 | for( std::list< DeclarationWithType* >::const_iterator candidate = candidates.begin(); candidate != candidates.end(); ++candidate ) { |
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454 | /// std::cout << "inferRecursive: candidate is "; |
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455 | /// (*candidate)->print( std::cout ); |
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456 | /// std::cout << std::endl; |
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457 | AssertionSet newHave, newerNeed( newNeed ); |
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458 | TypeEnvironment newEnv( newAlt.env ); |
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459 | OpenVarSet newOpenVars( openVars ); |
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460 | Type *adjType = (*candidate)->get_type()->clone(); |
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461 | adjustExprType( adjType, newEnv, indexer ); |
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462 | adjType->accept( global_renamer ); |
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463 | /// std::cerr << "unifying "; |
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464 | /// curDecl->get_type()->print( std::cerr ); |
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465 | /// std::cerr << " with "; |
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466 | /// adjType->print( std::cerr ); |
---|
467 | /// std::cerr << std::endl; |
---|
468 | if( unify( curDecl->get_type(), adjType, newEnv, newerNeed, newHave, newOpenVars, indexer ) ) { |
---|
469 | /// std::cerr << "success!" << std::endl; |
---|
470 | SymTab::Indexer newDecls( decls ); |
---|
471 | addToIndexer( newHave, newDecls ); |
---|
472 | Alternative newerAlt( newAlt ); |
---|
473 | newerAlt.env = newEnv; |
---|
474 | assert( (*candidate)->get_uniqueId() ); |
---|
475 | Expression *varExpr = new VariableExpr( static_cast< DeclarationWithType* >( Declaration::declFromId( (*candidate)->get_uniqueId() ) ) ); |
---|
476 | deleteAll( varExpr->get_results() ); |
---|
477 | varExpr->get_results().clear(); |
---|
478 | varExpr->get_results().push_front( adjType->clone() ); |
---|
479 | /// std::cout << "satisfying assertion " << curDecl->get_uniqueId() << " "; |
---|
480 | /// curDecl->print( std::cout ); |
---|
481 | /// std::cout << " with declaration " << (*candidate)->get_uniqueId() << " "; |
---|
482 | /// (*candidate)->print( std::cout ); |
---|
483 | /// std::cout << std::endl; |
---|
484 | ApplicationExpr *appExpr = static_cast< ApplicationExpr* >( newerAlt.expr ); |
---|
485 | // XXX: this is a memory leak, but adjType can't be deleted because it might contain assertions |
---|
486 | appExpr->get_inferParams()[ curDecl->get_uniqueId() ] = ParamEntry( (*candidate)->get_uniqueId(), adjType->clone(), curDecl->get_type()->clone(), varExpr ); |
---|
487 | inferRecursive( begin, end, newerAlt, newOpenVars, newDecls, newerNeed, level, indexer, out ); |
---|
488 | } else { |
---|
489 | delete adjType; |
---|
490 | } |
---|
491 | } |
---|
492 | } |
---|
493 | |
---|
494 | template< typename OutputIterator > |
---|
495 | void |
---|
496 | AlternativeFinder::inferParameters( const AssertionSet &need, AssertionSet &have, const Alternative &newAlt, OpenVarSet &openVars, OutputIterator out ) |
---|
497 | { |
---|
498 | /// std::cout << "inferParameters: assertions needed are" << std::endl; |
---|
499 | /// printAll( need, std::cout, 8 ); |
---|
500 | SymTab::Indexer decls( indexer ); |
---|
501 | /// std::cout << "============= original indexer" << std::endl; |
---|
502 | /// indexer.print( std::cout ); |
---|
503 | /// std::cout << "============= new indexer" << std::endl; |
---|
504 | /// decls.print( std::cout ); |
---|
505 | addToIndexer( have, decls ); |
---|
506 | AssertionSet newNeed; |
---|
507 | inferRecursive( need.begin(), need.end(), newAlt, openVars, decls, newNeed, 0, indexer, out ); |
---|
508 | /// std::cout << "declaration 14 is "; |
---|
509 | /// Declaration::declFromId |
---|
510 | /// *out++ = newAlt; |
---|
511 | } |
---|
512 | |
---|
513 | template< typename OutputIterator > |
---|
514 | void |
---|
515 | AlternativeFinder::makeFunctionAlternatives( const Alternative &func, FunctionType *funcType, AltList &actualAlt, OutputIterator out ) |
---|
516 | { |
---|
517 | OpenVarSet openVars; |
---|
518 | AssertionSet resultNeed, resultHave; |
---|
519 | TypeEnvironment resultEnv; |
---|
520 | makeUnifiableVars( funcType, openVars, resultNeed ); |
---|
521 | if( instantiateFunction( funcType->get_parameters(), actualAlt, funcType->get_isVarArgs(), openVars, resultEnv, resultNeed, resultHave ) ) { |
---|
522 | ApplicationExpr *appExpr = new ApplicationExpr( func.expr->clone() ); |
---|
523 | Alternative newAlt( appExpr, resultEnv, sumCost( actualAlt ) ); |
---|
524 | makeExprList( actualAlt, appExpr->get_args() ); |
---|
525 | /// std::cout << "need assertions:" << std::endl; |
---|
526 | /// printAssertionSet( resultNeed, std::cout, 8 ); |
---|
527 | inferParameters( resultNeed, resultHave, newAlt, openVars, out ); |
---|
528 | } |
---|
529 | } |
---|
530 | |
---|
531 | void |
---|
532 | AlternativeFinder::visit(UntypedExpr *untypedExpr) |
---|
533 | { |
---|
534 | bool doneInit = false; |
---|
535 | AlternativeFinder funcOpFinder( indexer, env ); |
---|
536 | |
---|
537 | AlternativeFinder funcFinder( indexer, env ); |
---|
538 | { |
---|
539 | NameExpr *fname; |
---|
540 | if ( (fname = dynamic_cast<NameExpr *>(untypedExpr->get_function())) |
---|
541 | && ( fname->get_name() == std::string("LabAddress")) ) { |
---|
542 | alternatives.push_back( Alternative(untypedExpr, env, Cost()) ); |
---|
543 | return; |
---|
544 | } |
---|
545 | } |
---|
546 | |
---|
547 | funcFinder.findWithAdjustment( untypedExpr->get_function() ); |
---|
548 | std::list< AlternativeFinder > argAlternatives; |
---|
549 | findSubExprs( untypedExpr->begin_args(), untypedExpr->end_args(), back_inserter( argAlternatives ) ); |
---|
550 | |
---|
551 | std::list< AltList > possibilities; |
---|
552 | combos( argAlternatives.begin(), argAlternatives.end(), back_inserter( possibilities ) ); |
---|
553 | |
---|
554 | Tuples::TupleAssignSpotter tassign(this); |
---|
555 | if ( tassign.isTupleAssignment(untypedExpr, possibilities) ) { |
---|
556 | // take care of possible tuple assignments, or discard expression |
---|
557 | return; |
---|
558 | } // else ... |
---|
559 | |
---|
560 | AltList candidates; |
---|
561 | |
---|
562 | for( AltList::const_iterator func = funcFinder.alternatives.begin(); func != funcFinder.alternatives.end(); ++func ) { |
---|
563 | /// std::cout << "working on alternative: " << std::endl; |
---|
564 | /// func->print( std::cout, 8 ); |
---|
565 | // check if the type is pointer to function |
---|
566 | PointerType *pointer; |
---|
567 | if( func->expr->get_results().size() == 1 && ( pointer = dynamic_cast< PointerType* >( func->expr->get_results().front() ) ) ) { |
---|
568 | if( FunctionType *function = dynamic_cast< FunctionType* >( pointer->get_base() ) ) { |
---|
569 | for( std::list< AltList >::iterator actualAlt = possibilities.begin(); actualAlt != possibilities.end(); ++actualAlt ) { |
---|
570 | // XXX |
---|
571 | //Designators::check_alternative( function, *actualAlt ); |
---|
572 | makeFunctionAlternatives( *func, function, *actualAlt, std::back_inserter( candidates ) ); |
---|
573 | } |
---|
574 | } else if( TypeInstType *typeInst = dynamic_cast< TypeInstType* >( pointer->get_base() ) ) { |
---|
575 | EqvClass eqvClass; |
---|
576 | if( func->env.lookup( typeInst->get_name(), eqvClass ) && eqvClass.type ) { |
---|
577 | if( FunctionType *function = dynamic_cast< FunctionType* >( eqvClass.type ) ) { |
---|
578 | for( std::list< AltList >::iterator actualAlt = possibilities.begin(); actualAlt != possibilities.end(); ++actualAlt ) { |
---|
579 | makeFunctionAlternatives( *func, function, *actualAlt, std::back_inserter( candidates ) ); |
---|
580 | } |
---|
581 | } |
---|
582 | } |
---|
583 | } |
---|
584 | } else { |
---|
585 | // seek a function operator that's compatible |
---|
586 | if( !doneInit ) { |
---|
587 | doneInit = true; |
---|
588 | NameExpr *opExpr = new NameExpr( "?()" ); |
---|
589 | try { |
---|
590 | funcOpFinder.findWithAdjustment( opExpr ); |
---|
591 | } catch( SemanticError &e ) { |
---|
592 | // it's ok if there aren't any defined function ops |
---|
593 | } |
---|
594 | /// std::cout << "known function ops:" << std::endl; |
---|
595 | /// printAlts( funcOpFinder.alternatives, std::cout, 8 ); |
---|
596 | } |
---|
597 | |
---|
598 | for( AltList::const_iterator funcOp = funcOpFinder.alternatives.begin(); funcOp != funcOpFinder.alternatives.end(); ++funcOp ) { |
---|
599 | // check if the type is pointer to function |
---|
600 | PointerType *pointer; |
---|
601 | if( funcOp->expr->get_results().size() == 1 |
---|
602 | && ( pointer = dynamic_cast< PointerType* >( funcOp->expr->get_results().front() ) ) ) { |
---|
603 | if ( FunctionType *function = dynamic_cast< FunctionType* >( pointer->get_base() ) ) { |
---|
604 | for( std::list< AltList >::iterator actualAlt = possibilities.begin(); actualAlt != possibilities.end(); ++actualAlt ) { |
---|
605 | AltList currentAlt; |
---|
606 | currentAlt.push_back( *func ); |
---|
607 | currentAlt.insert( currentAlt.end(), actualAlt->begin(), actualAlt->end() ); |
---|
608 | makeFunctionAlternatives( *funcOp, function, currentAlt, std::back_inserter( candidates ) ); |
---|
609 | } |
---|
610 | } |
---|
611 | } |
---|
612 | } |
---|
613 | } |
---|
614 | } |
---|
615 | |
---|
616 | for( AltList::iterator withFunc = candidates.begin(); withFunc != candidates.end(); ++withFunc ) { |
---|
617 | Cost cvtCost = computeConversionCost( *withFunc, indexer ); |
---|
618 | |
---|
619 | #ifdef DEBUG_COST |
---|
620 | ApplicationExpr *appExpr = dynamic_cast< ApplicationExpr* >( withFunc->expr ); |
---|
621 | assert( appExpr ); |
---|
622 | PointerType *pointer = dynamic_cast< PointerType* >( appExpr->get_function()->get_results().front() ); |
---|
623 | assert( pointer ); |
---|
624 | FunctionType *function = dynamic_cast< FunctionType* >( pointer->get_base() ); |
---|
625 | assert( function ); |
---|
626 | std::cout << "Case +++++++++++++" << std::endl; |
---|
627 | std::cout << "formals are:" << std::endl; |
---|
628 | printAll( function->get_parameters(), std::cout, 8 ); |
---|
629 | std::cout << "actuals are:" << std::endl; |
---|
630 | printAll( appExpr->get_args(), std::cout, 8 ); |
---|
631 | std::cout << "bindings are:" << std::endl; |
---|
632 | withFunc->env.print( std::cout, 8 ); |
---|
633 | std::cout << "cost of conversion is:" << cvtCost << std::endl; |
---|
634 | #endif |
---|
635 | |
---|
636 | if( cvtCost != Cost::infinity ) { |
---|
637 | withFunc->cvtCost = cvtCost; |
---|
638 | alternatives.push_back( *withFunc ); |
---|
639 | } |
---|
640 | } |
---|
641 | candidates.clear(); |
---|
642 | candidates.splice( candidates.end(), alternatives ); |
---|
643 | |
---|
644 | findMinCost( candidates.begin(), candidates.end(), std::back_inserter( alternatives ) ); |
---|
645 | } |
---|
646 | |
---|
647 | bool |
---|
648 | isLvalue( Expression *expr ) { |
---|
649 | for( std::list< Type* >::const_iterator i = expr->get_results().begin(); i != expr->get_results().end(); ++i ) { |
---|
650 | if( !(*i)->get_isLvalue() ) return false; |
---|
651 | } |
---|
652 | return true; |
---|
653 | } |
---|
654 | |
---|
655 | void |
---|
656 | AlternativeFinder::visit(AddressExpr *addressExpr) |
---|
657 | { |
---|
658 | AlternativeFinder finder( indexer, env ); |
---|
659 | finder.find( addressExpr->get_arg() ); |
---|
660 | for( std::list< Alternative >::iterator i = finder.alternatives.begin(); i != finder.alternatives.end(); ++i ) { |
---|
661 | if( isLvalue( i->expr ) ) { |
---|
662 | alternatives.push_back( Alternative( new AddressExpr( i->expr->clone() ), i->env, i->cost ) ); |
---|
663 | } |
---|
664 | } |
---|
665 | } |
---|
666 | |
---|
667 | void |
---|
668 | AlternativeFinder::visit(CastExpr *castExpr) |
---|
669 | { |
---|
670 | for( std::list< Type* >::iterator i = castExpr->get_results().begin(); i != castExpr->get_results().end(); ++i ) { |
---|
671 | SymTab::validateType( *i, &indexer ); |
---|
672 | adjustExprType( *i, env, indexer ); |
---|
673 | } |
---|
674 | |
---|
675 | AlternativeFinder finder( indexer, env ); |
---|
676 | finder.findWithAdjustment( castExpr->get_arg() ); |
---|
677 | |
---|
678 | AltList candidates; |
---|
679 | for( std::list< Alternative >::iterator i = finder.alternatives.begin(); i != finder.alternatives.end(); ++i ) { |
---|
680 | AssertionSet needAssertions, haveAssertions; |
---|
681 | OpenVarSet openVars; |
---|
682 | |
---|
683 | // It's possible that a cast can throw away some values in a multiply-valued expression. |
---|
684 | // (An example is a cast-to-void, which casts from one value to zero.) |
---|
685 | // Figure out the prefix of the subexpression results that are cast directly. |
---|
686 | // The candidate is invalid if it has fewer results than there are types to cast to. |
---|
687 | int discardedValues = (*i).expr->get_results().size() - castExpr->get_results().size(); |
---|
688 | if( discardedValues < 0 ) continue; |
---|
689 | std::list< Type* >::iterator candidate_end = (*i).expr->get_results().begin(); |
---|
690 | std::advance( candidate_end, castExpr->get_results().size() ); |
---|
691 | if( !unifyList( (*i).expr->get_results().begin(), candidate_end, |
---|
692 | castExpr->get_results().begin(), castExpr->get_results().end(), i->env, needAssertions, haveAssertions, openVars, indexer ) ) continue; |
---|
693 | Cost thisCost = castCostList( (*i).expr->get_results().begin(), candidate_end, |
---|
694 | castExpr->get_results().begin(), castExpr->get_results().end(), indexer, i->env ); |
---|
695 | if( thisCost != Cost::infinity ) { |
---|
696 | // count one safe conversion for each value that is thrown away |
---|
697 | thisCost += Cost( 0, 0, discardedValues ); |
---|
698 | CastExpr *newExpr = castExpr->clone(); |
---|
699 | newExpr->set_arg( i->expr->clone() ); |
---|
700 | candidates.push_back( Alternative( newExpr, i->env, i->cost, thisCost ) ); |
---|
701 | } |
---|
702 | } |
---|
703 | |
---|
704 | // findMinCost selects the alternatives with the lowest "cost" members, but has the side effect |
---|
705 | // of copying the cvtCost member to the cost member (since the old cost is now irrelevant). |
---|
706 | // Thus, calling findMinCost twice selects first based on argument cost, then on conversion cost. |
---|
707 | AltList minArgCost; |
---|
708 | findMinCost( candidates.begin(), candidates.end(), std::back_inserter( minArgCost ) ); |
---|
709 | findMinCost( minArgCost.begin(), minArgCost.end(), std::back_inserter( alternatives ) ); |
---|
710 | } |
---|
711 | |
---|
712 | void |
---|
713 | AlternativeFinder::visit(UntypedMemberExpr *memberExpr) |
---|
714 | { |
---|
715 | AlternativeFinder funcFinder( indexer, env ); |
---|
716 | funcFinder.findWithAdjustment( memberExpr->get_aggregate() ); |
---|
717 | |
---|
718 | for( AltList::const_iterator agg = funcFinder.alternatives.begin(); agg != funcFinder.alternatives.end(); ++agg ) { |
---|
719 | if( agg->expr->get_results().size() == 1 ) { |
---|
720 | if( StructInstType *structInst = dynamic_cast< StructInstType* >( agg->expr->get_results().front() ) ) { |
---|
721 | addAggMembers( structInst, agg->expr, agg->cost, memberExpr->get_member() ); |
---|
722 | } else if( UnionInstType *unionInst = dynamic_cast< UnionInstType* >( agg->expr->get_results().front() ) ) { |
---|
723 | addAggMembers( unionInst, agg->expr, agg->cost, memberExpr->get_member() ); |
---|
724 | } |
---|
725 | } |
---|
726 | } |
---|
727 | } |
---|
728 | |
---|
729 | void |
---|
730 | AlternativeFinder::visit(MemberExpr *memberExpr) |
---|
731 | { |
---|
732 | alternatives.push_back( Alternative( memberExpr->clone(), env, Cost::zero ) ); |
---|
733 | } |
---|
734 | |
---|
735 | void |
---|
736 | AlternativeFinder::visit(NameExpr *nameExpr) |
---|
737 | { |
---|
738 | std::list< DeclarationWithType* > declList; |
---|
739 | indexer.lookupId( nameExpr->get_name(), declList ); |
---|
740 | /// std::cerr << "nameExpr is " << nameExpr->get_name() << std::endl; |
---|
741 | for( std::list< DeclarationWithType* >::iterator i = declList.begin(); i != declList.end(); ++i ) { |
---|
742 | VariableExpr newExpr( *i, nameExpr->get_argName() ); |
---|
743 | alternatives.push_back( Alternative( newExpr.clone(), env, Cost() ) ); |
---|
744 | /// std::cerr << "decl is "; |
---|
745 | /// (*i)->print( std::cerr ); |
---|
746 | /// std::cerr << std::endl; |
---|
747 | /// std::cerr << "newExpr is "; |
---|
748 | /// newExpr.print( std::cerr ); |
---|
749 | /// std::cerr << std::endl; |
---|
750 | renameTypes( alternatives.back().expr ); |
---|
751 | if( StructInstType *structInst = dynamic_cast< StructInstType* >( (*i)->get_type() ) ) { |
---|
752 | addAggMembers( structInst, &newExpr, Cost( 0, 0, 1 ), "" ); |
---|
753 | } else if( UnionInstType *unionInst = dynamic_cast< UnionInstType* >( (*i)->get_type() ) ) { |
---|
754 | addAggMembers( unionInst, &newExpr, Cost( 0, 0, 1 ), "" ); |
---|
755 | } |
---|
756 | } |
---|
757 | } |
---|
758 | |
---|
759 | void |
---|
760 | AlternativeFinder::visit(VariableExpr *variableExpr) |
---|
761 | { |
---|
762 | alternatives.push_back( Alternative( variableExpr->clone(), env, Cost::zero ) ); |
---|
763 | } |
---|
764 | |
---|
765 | void |
---|
766 | AlternativeFinder::visit(ConstantExpr *constantExpr) |
---|
767 | { |
---|
768 | alternatives.push_back( Alternative( constantExpr->clone(), env, Cost::zero ) ); |
---|
769 | } |
---|
770 | |
---|
771 | void |
---|
772 | AlternativeFinder::visit(SizeofExpr *sizeofExpr) |
---|
773 | { |
---|
774 | if( sizeofExpr->get_isType() ) { |
---|
775 | alternatives.push_back( Alternative( sizeofExpr->clone(), env, Cost::zero ) ); |
---|
776 | } else { |
---|
777 | AlternativeFinder finder( indexer, env ); |
---|
778 | finder.find( sizeofExpr->get_expr() ); |
---|
779 | if( finder.alternatives.size() != 1 ) { |
---|
780 | throw SemanticError( "Ambiguous expression in sizeof operand: ", sizeofExpr->get_expr() ); |
---|
781 | } |
---|
782 | Alternative &choice = finder.alternatives.front(); |
---|
783 | alternatives.push_back( Alternative( new SizeofExpr( choice.expr->clone() ), choice.env, Cost::zero ) ); |
---|
784 | } |
---|
785 | } |
---|
786 | |
---|
787 | void |
---|
788 | AlternativeFinder::resolveAttr( DeclarationWithType *funcDecl, FunctionType *function, Type *argType, const TypeEnvironment &env ) |
---|
789 | { |
---|
790 | // assume no polymorphism |
---|
791 | // assume no implicit conversions |
---|
792 | assert( function->get_parameters().size() == 1 ); |
---|
793 | /// std::cout << "resolvAttr: funcDecl is "; |
---|
794 | /// funcDecl->print( std::cout ); |
---|
795 | /// std::cout << " argType is "; |
---|
796 | /// argType->print( std::cout ); |
---|
797 | /// std::cout << std::endl; |
---|
798 | if( typesCompatibleIgnoreQualifiers( argType, function->get_parameters().front()->get_type(), indexer, env ) ) { |
---|
799 | alternatives.push_back( Alternative( new AttrExpr( new VariableExpr( funcDecl ), argType->clone() ), env, Cost::zero ) ); |
---|
800 | for( std::list< DeclarationWithType* >::iterator i = function->get_returnVals().begin(); i != function->get_returnVals().end(); ++i ) { |
---|
801 | alternatives.back().expr->get_results().push_back( (*i)->get_type()->clone() ); |
---|
802 | } |
---|
803 | } |
---|
804 | } |
---|
805 | |
---|
806 | void |
---|
807 | AlternativeFinder::visit(AttrExpr *attrExpr) |
---|
808 | { |
---|
809 | // assume no 'pointer-to-attribute' |
---|
810 | NameExpr *nameExpr = dynamic_cast< NameExpr* >( attrExpr->get_attr() ); |
---|
811 | assert( nameExpr ); |
---|
812 | std::list< DeclarationWithType* > attrList; |
---|
813 | indexer.lookupId( nameExpr->get_name(), attrList ); |
---|
814 | if( attrExpr->get_isType() || attrExpr->get_expr() ) { |
---|
815 | for( std::list< DeclarationWithType* >::iterator i = attrList.begin(); i != attrList.end(); ++i ) { |
---|
816 | // check if the type is function |
---|
817 | if( FunctionType *function = dynamic_cast< FunctionType* >( (*i)->get_type() ) ) { |
---|
818 | // assume exactly one parameter |
---|
819 | if( function->get_parameters().size() == 1 ) { |
---|
820 | if( attrExpr->get_isType() ) { |
---|
821 | resolveAttr( *i, function, attrExpr->get_type(), env ); |
---|
822 | } else { |
---|
823 | AlternativeFinder finder( indexer, env ); |
---|
824 | finder.find( attrExpr->get_expr() ); |
---|
825 | for( AltList::iterator choice = finder.alternatives.begin(); choice != finder.alternatives.end(); ++choice ) { |
---|
826 | if( choice->expr->get_results().size() == 1 ) { |
---|
827 | resolveAttr(*i, function, choice->expr->get_results().front(), choice->env ); |
---|
828 | } |
---|
829 | } |
---|
830 | } |
---|
831 | } |
---|
832 | } |
---|
833 | } |
---|
834 | } else { |
---|
835 | for( std::list< DeclarationWithType* >::iterator i = attrList.begin(); i != attrList.end(); ++i ) { |
---|
836 | VariableExpr newExpr( *i ); |
---|
837 | alternatives.push_back( Alternative( newExpr.clone(), env, Cost() ) ); |
---|
838 | renameTypes( alternatives.back().expr ); |
---|
839 | } |
---|
840 | } |
---|
841 | } |
---|
842 | |
---|
843 | void |
---|
844 | AlternativeFinder::visit(LogicalExpr *logicalExpr) |
---|
845 | { |
---|
846 | AlternativeFinder firstFinder( indexer, env ); |
---|
847 | firstFinder.findWithAdjustment( logicalExpr->get_arg1() ); |
---|
848 | for( AltList::const_iterator first = firstFinder.alternatives.begin(); first != firstFinder.alternatives.end(); ++first ) { |
---|
849 | AlternativeFinder secondFinder( indexer, first->env ); |
---|
850 | secondFinder.findWithAdjustment( logicalExpr->get_arg2() ); |
---|
851 | for( AltList::const_iterator second = secondFinder.alternatives.begin(); second != secondFinder.alternatives.end(); ++second ) { |
---|
852 | LogicalExpr *newExpr = new LogicalExpr( first->expr->clone(), second->expr->clone(), logicalExpr->get_isAnd() ); |
---|
853 | alternatives.push_back( Alternative( newExpr, second->env, first->cost + second->cost ) ); |
---|
854 | } |
---|
855 | } |
---|
856 | } |
---|
857 | |
---|
858 | void |
---|
859 | AlternativeFinder::visit(ConditionalExpr *conditionalExpr) |
---|
860 | { |
---|
861 | AlternativeFinder firstFinder( indexer, env ); |
---|
862 | firstFinder.findWithAdjustment( conditionalExpr->get_arg1() ); |
---|
863 | for( AltList::const_iterator first = firstFinder.alternatives.begin(); first != firstFinder.alternatives.end(); ++first ) { |
---|
864 | AlternativeFinder secondFinder( indexer, first->env ); |
---|
865 | secondFinder.findWithAdjustment( conditionalExpr->get_arg2() ); |
---|
866 | for( AltList::const_iterator second = secondFinder.alternatives.begin(); second != secondFinder.alternatives.end(); ++second ) { |
---|
867 | AlternativeFinder thirdFinder( indexer, second->env ); |
---|
868 | thirdFinder.findWithAdjustment( conditionalExpr->get_arg3() ); |
---|
869 | for( AltList::const_iterator third = thirdFinder.alternatives.begin(); third != thirdFinder.alternatives.end(); ++third ) { |
---|
870 | OpenVarSet openVars; |
---|
871 | AssertionSet needAssertions, haveAssertions; |
---|
872 | Alternative newAlt( 0, third->env, first->cost + second->cost + third->cost ); |
---|
873 | std::list< Type* > commonTypes; |
---|
874 | if( unifyList( second->expr->get_results().begin(), second->expr->get_results().end(), third->expr->get_results().begin(), third->expr->get_results().end(), newAlt.env, needAssertions, haveAssertions, openVars, indexer, commonTypes ) ) { |
---|
875 | ConditionalExpr *newExpr = new ConditionalExpr( first->expr->clone(), second->expr->clone(), third->expr->clone() ); |
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876 | std::list< Type* >::const_iterator original = second->expr->get_results().begin(); |
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877 | std::list< Type* >::const_iterator commonType = commonTypes.begin(); |
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878 | for( ; original != second->expr->get_results().end() && commonType != commonTypes.end(); ++original, ++commonType ) { |
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879 | if( *commonType ) { |
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880 | newExpr->get_results().push_back( *commonType ); |
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881 | } else { |
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882 | newExpr->get_results().push_back( (*original)->clone() ); |
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883 | } |
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884 | } |
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885 | newAlt.expr = newExpr; |
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886 | inferParameters( needAssertions, haveAssertions, newAlt, openVars, back_inserter( alternatives ) ); |
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887 | } |
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888 | } |
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889 | } |
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890 | } |
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891 | } |
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892 | |
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893 | void |
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894 | AlternativeFinder::visit(CommaExpr *commaExpr) |
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895 | { |
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896 | TypeEnvironment newEnv( env ); |
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897 | Expression *newFirstArg = resolveInVoidContext( commaExpr->get_arg1(), indexer, newEnv ); |
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898 | AlternativeFinder secondFinder( indexer, newEnv ); |
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899 | secondFinder.findWithAdjustment( commaExpr->get_arg2() ); |
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900 | for( AltList::const_iterator alt = secondFinder.alternatives.begin(); alt != secondFinder.alternatives.end(); ++alt ) { |
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901 | alternatives.push_back( Alternative( new CommaExpr( newFirstArg->clone(), alt->expr->clone() ), alt->env, alt->cost ) ); |
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902 | } |
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903 | delete newFirstArg; |
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904 | } |
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905 | |
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906 | void |
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907 | AlternativeFinder::visit(TupleExpr *tupleExpr) |
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908 | { |
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909 | std::list< AlternativeFinder > subExprAlternatives; |
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910 | findSubExprs( tupleExpr->get_exprs().begin(), tupleExpr->get_exprs().end(), back_inserter( subExprAlternatives ) ); |
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911 | std::list< AltList > possibilities; |
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912 | combos( subExprAlternatives.begin(), subExprAlternatives.end(), back_inserter( possibilities ) ); |
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913 | for( std::list< AltList >::const_iterator i = possibilities.begin(); i != possibilities.end(); ++i ) { |
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914 | TupleExpr *newExpr = new TupleExpr; |
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915 | makeExprList( *i, newExpr->get_exprs() ); |
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916 | for( std::list< Expression* >::const_iterator resultExpr = newExpr->get_exprs().begin(); resultExpr != newExpr->get_exprs().end(); ++resultExpr ) { |
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917 | for( std::list< Type* >::const_iterator resultType = (*resultExpr)->get_results().begin(); resultType != (*resultExpr)->get_results().end(); ++resultType ) { |
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918 | newExpr->get_results().push_back( (*resultType)->clone() ); |
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919 | } |
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920 | } |
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921 | |
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922 | TypeEnvironment compositeEnv; |
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923 | simpleCombineEnvironments( i->begin(), i->end(), compositeEnv ); |
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924 | alternatives.push_back( Alternative( newExpr, compositeEnv, sumCost( *i ) ) ); |
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925 | } |
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926 | } |
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927 | |
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928 | } // namespace ResolvExpr |
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