1 | // |
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2 | // Cforall Version 1.0.0 Copyright (C) 2015 University of Waterloo |
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3 | // |
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4 | // The contents of this file are covered under the licence agreement in the |
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5 | // file "LICENCE" distributed with Cforall. |
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6 | // |
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7 | // CastCost.cc -- |
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8 | // |
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9 | // Author : Richard C. Bilson |
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10 | // Created On : Sun May 17 06:57:43 2015 |
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11 | // Last Modified By : Peter A. Buhr |
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12 | // Last Modified On : Tue Feb 2 15:34:36 2016 |
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13 | // Update Count : 7 |
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14 | // |
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15 | |
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16 | #include <cassert> // for assert |
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17 | |
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18 | #include "AST/Print.hpp" |
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19 | #include "AST/SymbolTable.hpp" |
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20 | #include "AST/Type.hpp" |
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21 | #include "AST/TypeEnvironment.hpp" |
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22 | #include "ConversionCost.h" // for ConversionCost |
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23 | #include "Cost.h" // for Cost, Cost::infinity |
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24 | #include "ResolvExpr/TypeEnvironment.h" // for TypeEnvironment, EqvClass |
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25 | #include "SymTab/Indexer.h" // for Indexer |
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26 | #include "SynTree/Declaration.h" // for TypeDecl, NamedTypeDecl |
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27 | #include "SynTree/Type.h" // for PointerType, Type, TypeInstType |
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28 | #include "typeops.h" // for typesCompatibleIgnoreQualifiers |
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29 | |
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30 | #if 0 |
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31 | #define PRINT(x) x |
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32 | #else |
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33 | #define PRINT(x) |
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34 | #endif |
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35 | |
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36 | namespace ResolvExpr { |
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37 | struct CastCost_old : public ConversionCost { |
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38 | public: |
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39 | CastCost_old( const Type * dest, const SymTab::Indexer &indexer, const TypeEnvironment &env, CostFunction costFunc ); |
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40 | |
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41 | using ConversionCost::previsit; |
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42 | using ConversionCost::postvisit; |
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43 | void postvisit( const BasicType * basicType ); |
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44 | void postvisit( const PointerType * pointerType ); |
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45 | }; |
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46 | |
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47 | Cost castCost( const Type * src, const Type * dest, const SymTab::Indexer &indexer, const TypeEnvironment &env ) { |
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48 | if ( const TypeInstType * destAsTypeInst = dynamic_cast< const TypeInstType * >( dest ) ) { |
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49 | if ( const EqvClass * eqvClass = env.lookup( destAsTypeInst->name ) ) { |
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50 | if ( eqvClass->type ) { |
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51 | return castCost( src, eqvClass->type, indexer, env ); |
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52 | } else { |
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53 | return Cost::infinity; |
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54 | } |
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55 | } else if ( const NamedTypeDecl * namedType = indexer.lookupType( destAsTypeInst->name ) ) { |
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56 | // all typedefs should be gone by this point |
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57 | const TypeDecl * type = strict_dynamic_cast< const TypeDecl * >( namedType ); |
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58 | if ( type->base ) { |
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59 | return castCost( src, type->base, indexer, env ) + Cost::safe; |
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60 | } // if |
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61 | } // if |
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62 | } // if |
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63 | |
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64 | PRINT( |
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65 | std::cerr << "castCost ::: src is "; |
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66 | src->print( std::cerr ); |
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67 | std::cerr << std::endl << "dest is "; |
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68 | dest->print( std::cerr ); |
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69 | std::cerr << std::endl << "env is" << std::endl; |
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70 | env.print( std::cerr, 8 ); |
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71 | ) |
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72 | |
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73 | if ( typesCompatibleIgnoreQualifiers( src, dest, indexer, env ) ) { |
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74 | PRINT( std::cerr << "compatible!" << std::endl; ) |
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75 | return Cost::zero; |
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76 | } else if ( dynamic_cast< const VoidType * >( dest ) ) { |
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77 | return Cost::safe; |
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78 | } else if ( const ReferenceType * refType = dynamic_cast< const ReferenceType * > ( dest ) ) { |
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79 | PRINT( std::cerr << "conversionCost: dest is reference" << std::endl; ) |
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80 | return convertToReferenceCost( src, refType, indexer, env, [](const Type * t1, const Type * t2, const SymTab::Indexer & indexer, const TypeEnvironment & env ) { |
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81 | return ptrsCastable( t1, t2, env, indexer ); |
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82 | }); |
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83 | } else { |
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84 | PassVisitor<CastCost_old> converter( |
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85 | dest, indexer, env, |
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86 | (Cost (*)( const Type *, const Type *, const SymTab::Indexer &, const TypeEnvironment & )) |
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87 | castCost ); |
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88 | src->accept( converter ); |
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89 | if ( converter.pass.get_cost() == Cost::infinity ) { |
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90 | return Cost::infinity; |
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91 | } else { |
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92 | // xxx - why are we adding cost 0 here? |
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93 | return converter.pass.get_cost() + Cost::zero; |
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94 | } // if |
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95 | } // if |
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96 | } |
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97 | |
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98 | CastCost_old::CastCost_old( const Type * dest, const SymTab::Indexer &indexer, const TypeEnvironment &env, CostFunction costFunc ) |
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99 | : ConversionCost( dest, indexer, env, costFunc ) { |
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100 | } |
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101 | |
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102 | void CastCost_old::postvisit( const BasicType * basicType ) { |
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103 | const PointerType * destAsPointer = dynamic_cast< const PointerType * >( dest ); |
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104 | if ( destAsPointer && basicType->isInteger() ) { |
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105 | // necessary for, e.g. unsigned long => void * |
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106 | cost = Cost::unsafe; |
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107 | } else { |
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108 | cost = conversionCost( basicType, dest, indexer, env ); |
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109 | } // if |
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110 | } |
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111 | |
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112 | void CastCost_old::postvisit( const PointerType * pointerType ) { |
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113 | if ( const PointerType * destAsPtr = dynamic_cast< const PointerType * >( dest ) ) { |
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114 | if ( pointerType->tq <= destAsPtr->tq && typesCompatibleIgnoreQualifiers( pointerType->base, destAsPtr->base, indexer, env ) ) { |
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115 | cost = Cost::safe; |
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116 | } else { |
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117 | TypeEnvironment newEnv( env ); |
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118 | newEnv.add( pointerType->forall ); |
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119 | newEnv.add( pointerType->base->forall ); |
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120 | int castResult = ptrsCastable( pointerType->base, destAsPtr->base, newEnv, indexer ); |
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121 | if ( castResult > 0 ) { |
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122 | cost = Cost::safe; |
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123 | } else if ( castResult < 0 ) { |
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124 | cost = Cost::infinity; |
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125 | } // if |
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126 | } // if |
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127 | } else if ( const BasicType * destAsBasic = dynamic_cast< const BasicType * >( dest ) ) { |
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128 | if ( destAsBasic->isInteger() ) { |
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129 | // necessary for, e.g. void * => unsigned long |
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130 | cost = Cost::unsafe; |
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131 | } // if |
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132 | } |
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133 | } |
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134 | |
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135 | namespace { |
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136 | struct CastCost_new : public ConversionCost_new { |
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137 | using ConversionCost_new::previsit; |
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138 | using ConversionCost_new::postvisit; |
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139 | |
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140 | CastCost_new( |
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141 | const ast::Type * dst, const ast::SymbolTable & symtab, |
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142 | const ast::TypeEnvironment & env, CostCalculation costFunc ) |
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143 | : ConversionCost_new( dst, symtab, env, costFunc ) {} |
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144 | |
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145 | void postvisit( const ast::BasicType * basicType ) { |
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146 | auto ptr = dynamic_cast< const ast::PointerType * >( dst ); |
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147 | if ( ptr && basicType->isInteger() ) { |
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148 | // needed for, e.g. unsigned long => void * |
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149 | cost = Cost::unsafe; |
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150 | } else { |
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151 | cost = conversionCost( basicType, dst, symtab, env ); |
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152 | } |
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153 | } |
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154 | |
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155 | void postvisit( const ast::PointerType * pointerType ) { |
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156 | if ( auto ptr = dynamic_cast< const ast::PointerType * >( dst ) ) { |
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157 | if ( |
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158 | pointerType->qualifiers <= ptr->qualifiers |
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159 | && typesCompatibleIgnoreQualifiers( pointerType->base, ptr->base, symtab, env ) |
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160 | ) { |
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161 | cost = Cost::safe; |
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162 | } else { |
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163 | ast::TypeEnvironment newEnv{ env }; |
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164 | if ( auto wParams = pointerType->base.as< ast::ParameterizedType >() ) { |
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165 | newEnv.add( wParams->forall ); |
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166 | } |
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167 | int castResult = ptrsCastable( pointerType->base, ptr->base, symtab, newEnv ); |
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168 | if ( castResult > 0 ) { |
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169 | cost = Cost::safe; |
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170 | } else if ( castResult < 0 ) { |
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171 | cost = Cost::infinity; |
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172 | } |
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173 | } |
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174 | } else if ( auto basic = dynamic_cast< const ast::BasicType * >( dst ) ) { |
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175 | if ( basic->isInteger() ) { |
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176 | // necessary for, e.g. void * => unsigned long |
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177 | cost = Cost::unsafe; |
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178 | } |
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179 | } |
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180 | } |
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181 | }; |
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182 | } // anonymous namespace |
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183 | |
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184 | Cost castCost( |
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185 | const ast::Type * src, const ast::Type * dst, const ast::SymbolTable & symtab, |
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186 | const ast::TypeEnvironment & env |
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187 | ) { |
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188 | if ( auto typeInst = dynamic_cast< const ast::TypeInstType * >( dst ) ) { |
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189 | if ( const ast::EqvClass * eqvClass = env.lookup( typeInst->name ) ) { |
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190 | // check cast cost against bound type, if present |
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191 | if ( eqvClass->bound ) { |
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192 | return castCost( src, eqvClass->bound, symtab, env ); |
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193 | } else { |
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194 | return Cost::infinity; |
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195 | } |
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196 | } else if ( const ast::NamedTypeDecl * named = symtab.lookupType( typeInst->name ) ) { |
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197 | // all typedefs should be gone by now |
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198 | auto type = strict_dynamic_cast< const ast::TypeDecl * >( named ); |
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199 | if ( type->base ) { |
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200 | return castCost( src, type->base, symtab, env ) + Cost::safe; |
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201 | } |
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202 | } |
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203 | } |
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204 | |
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205 | PRINT( |
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206 | std::cerr << "castCost ::: src is "; |
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207 | ast::print( std::cerr, src ); |
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208 | std::cerr << std::endl << "dest is "; |
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209 | ast::print( std::cerr, dst ); |
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210 | std::cerr << std::endl << "env is" << std::endl; |
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211 | ast::print( std::cerr, env, 2 ); |
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212 | ) |
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213 | |
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214 | if ( typesCompatibleIgnoreQualifiers( src, dst, symtab, env ) ) { |
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215 | PRINT( std::cerr << "compatible!" << std::endl; ) |
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216 | return Cost::zero; |
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217 | } else if ( dynamic_cast< const ast::VoidType * >( dst ) ) { |
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218 | return Cost::safe; |
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219 | } else if ( auto refType = dynamic_cast< const ast::ReferenceType * >( dst ) ) { |
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220 | PRINT( std::cerr << "conversionCost: dest is reference" << std::endl; ) |
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221 | #warning cast on ptrsCastable artifact of having two functions, remove when port done |
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222 | return convertToReferenceCost( |
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223 | src, refType, symtab, env, |
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224 | ( int (*)( |
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225 | const ast::Type *, const ast::Type *, const ast::SymbolTable &, |
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226 | const ast::TypeEnvironment & ) |
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227 | ) ptrsCastable ); |
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228 | } else { |
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229 | #warning cast on castCost artifact of having two functions, remove when port done |
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230 | ast::Pass< CastCost_new > converter{ |
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231 | dst, symtab, env, |
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232 | ( Cost (*)( |
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233 | const ast::Type *, const ast::Type *, const ast::SymbolTable &, |
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234 | const ast::TypeEnvironment & ) |
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235 | ) castCost }; |
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236 | src->accept( converter ); |
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237 | return converter.pass.cost; |
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238 | } |
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239 | } |
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240 | |
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241 | } // namespace ResolvExpr |
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242 | |
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243 | // Local Variables: // |
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244 | // tab-width: 4 // |
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245 | // mode: c++ // |
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246 | // compile-command: "make install" // |
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247 | // End: // |
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