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 | // ConversionCost.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 07:06:19 2015 |
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11 | // Last Modified By : Andrew Beach |
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12 | // Last Modified On : Fri Oct 4 14:45:00 2019 |
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13 | // Update Count : 28 |
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14 | // |
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15 | |
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16 | #include "ConversionCost.h" |
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17 | |
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18 | #include <cassert> // for assert |
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19 | #include <list> // for list, list<>::const_iterator |
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20 | #include <string> // for operator==, string |
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21 | |
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22 | #include "ResolvExpr/Cost.h" // for Cost |
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23 | #include "ResolvExpr/TypeEnvironment.h" // for EqvClass, TypeEnvironment |
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24 | #include "SymTab/Indexer.h" // for Indexer |
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25 | #include "SynTree/Declaration.h" // for TypeDecl, NamedTypeDecl |
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26 | #include "SynTree/Type.h" // for Type, BasicType, TypeInstType |
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27 | #include "typeops.h" // for typesCompatibleIgnoreQualifiers |
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28 | |
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29 | namespace ResolvExpr { |
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30 | #if 0 |
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31 | const Cost Cost::zero = Cost{ 0, 0, 0, 0, 0, 0, 0 }; |
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32 | const Cost Cost::infinity = Cost{ -1, -1, -1, -1, -1, 1, -1 }; |
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33 | const Cost Cost::unsafe = Cost{ 1, 0, 0, 0, 0, 0, 0 }; |
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34 | const Cost Cost::poly = Cost{ 0, 1, 0, 0, 0, 0, 0 }; |
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35 | const Cost Cost::safe = Cost{ 0, 0, 1, 0, 0, 0, 0 }; |
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36 | const Cost Cost::sign = Cost{ 0, 0, 0, 1, 0, 0, 0 }; |
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37 | const Cost Cost::var = Cost{ 0, 0, 0, 0, 1, 0, 0 }; |
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38 | const Cost Cost::spec = Cost{ 0, 0, 0, 0, 0, -1, 0 }; |
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39 | const Cost Cost::reference = Cost{ 0, 0, 0, 0, 0, 0, 1 }; |
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40 | #endif |
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41 | |
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42 | #if 0 |
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43 | #define PRINT(x) x |
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44 | #else |
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45 | #define PRINT(x) |
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46 | #endif |
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47 | |
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48 | Cost conversionCost( const Type * src, const Type * dest, bool srcIsLvalue, |
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49 | const SymTab::Indexer &indexer, const TypeEnvironment &env ) { |
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50 | if ( const TypeInstType * destAsTypeInst = dynamic_cast< const TypeInstType * >( dest ) ) { |
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51 | PRINT( std::cerr << "type inst " << destAsTypeInst->name; ) |
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52 | if ( const EqvClass * eqvClass = env.lookup( destAsTypeInst->name ) ) { |
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53 | if ( eqvClass->type ) { |
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54 | return conversionCost( src, eqvClass->type, srcIsLvalue, indexer, env ); |
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55 | } else { |
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56 | return Cost::infinity; |
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57 | } |
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58 | } else if ( const NamedTypeDecl * namedType = indexer.lookupType( destAsTypeInst->name ) ) { |
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59 | PRINT( std::cerr << " found" << std::endl; ) |
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60 | const TypeDecl * type = dynamic_cast< const TypeDecl * >( namedType ); |
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61 | // all typedefs should be gone by this point |
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62 | assert( type ); |
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63 | if ( type->base ) { |
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64 | return conversionCost( src, type->base, srcIsLvalue, indexer, env ) |
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65 | + Cost::safe; |
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66 | } // if |
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67 | } // if |
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68 | PRINT( std::cerr << " not found" << std::endl; ) |
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69 | } // if |
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70 | PRINT( |
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71 | std::cerr << "src is "; |
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72 | src->print( std::cerr ); |
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73 | std::cerr << std::endl << "dest is "; |
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74 | dest->print( std::cerr ); |
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75 | std::cerr << std::endl << "env is" << std::endl; |
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76 | env.print( std::cerr, 8 ); |
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77 | ) |
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78 | if ( typesCompatibleIgnoreQualifiers( src, dest, indexer, env ) ) { |
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79 | PRINT( std::cerr << "compatible!" << std::endl; ) |
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80 | return Cost::zero; |
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81 | } else if ( dynamic_cast< const VoidType * >( dest ) ) { |
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82 | return Cost::safe; |
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83 | } else if ( const ReferenceType * refType = dynamic_cast< const ReferenceType * > ( dest ) ) { |
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84 | PRINT( std::cerr << "conversionCost: dest is reference" << std::endl; ) |
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85 | return convertToReferenceCost( src, refType, srcIsLvalue, indexer, env, [](const Type * const t1, const Type * t2, const SymTab::Indexer &, const TypeEnvironment & env ){ |
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86 | return ptrsAssignable( t1, t2, env ); |
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87 | }); |
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88 | } else { |
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89 | PassVisitor<ConversionCost> converter( |
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90 | dest, srcIsLvalue, indexer, env, |
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91 | (Cost (*)(const Type *, const Type *, bool, const SymTab::Indexer&, const TypeEnvironment&)) |
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92 | conversionCost ); |
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93 | src->accept( converter ); |
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94 | if ( converter.pass.get_cost() == Cost::infinity ) { |
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95 | return Cost::infinity; |
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96 | } else { |
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97 | return converter.pass.get_cost() + Cost::zero; |
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98 | } // if |
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99 | } // if |
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100 | } |
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101 | |
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102 | static Cost convertToReferenceCost( const Type * src, const Type * dest, bool srcIsLvalue, |
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103 | int diff, const SymTab::Indexer & indexer, const TypeEnvironment & env, PtrsFunction func ) { |
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104 | PRINT( std::cerr << "convert to reference cost... diff " << diff << " " << src << " / " << dest << std::endl; ) |
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105 | if ( diff > 0 ) { |
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106 | // TODO: document this |
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107 | Cost cost = convertToReferenceCost( |
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108 | strict_dynamic_cast< const ReferenceType * >( src )->base, dest, srcIsLvalue, |
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109 | diff-1, indexer, env, func ); |
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110 | cost.incReference(); |
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111 | return cost; |
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112 | } else if ( diff < -1 ) { |
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113 | // TODO: document this |
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114 | Cost cost = convertToReferenceCost( |
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115 | src, strict_dynamic_cast< const ReferenceType * >( dest )->base, srcIsLvalue, |
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116 | diff+1, indexer, env, func ); |
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117 | cost.incReference(); |
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118 | return cost; |
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119 | } else if ( diff == 0 ) { |
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120 | const ReferenceType * srcAsRef = dynamic_cast< const ReferenceType * >( src ); |
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121 | const ReferenceType * destAsRef = dynamic_cast< const ReferenceType * >( dest ); |
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122 | if ( srcAsRef && destAsRef ) { // pointer-like conversions between references |
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123 | PRINT( std::cerr << "converting between references" << std::endl; ) |
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124 | Type::Qualifiers tq1 = srcAsRef->base->tq; |
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125 | Type::Qualifiers tq2 = destAsRef->base->tq; |
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126 | if ( tq1 <= tq2 && typesCompatibleIgnoreQualifiers( srcAsRef->base, destAsRef->base, indexer, env ) ) { |
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127 | PRINT( std::cerr << " :: compatible and good qualifiers" << std::endl; ) |
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128 | if ( tq1 == tq2 ) { |
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129 | // types are the same |
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130 | return Cost::zero; |
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131 | } else { |
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132 | // types are the same, except otherPointer has more qualifiers |
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133 | return Cost::safe; |
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134 | } |
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135 | } else { // xxx - this discards reference qualifiers from consideration -- reducing qualifiers is a safe conversion; is this right? |
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136 | int assignResult = func( srcAsRef->base, destAsRef->base, indexer, env ); |
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137 | PRINT( std::cerr << "comparing references: " << assignResult << " " << srcAsRef << " " << destAsRef << std::endl; ) |
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138 | if ( assignResult > 0 ) { |
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139 | return Cost::safe; |
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140 | } else if ( assignResult < 0 ) { |
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141 | return Cost::unsafe; |
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142 | } // if |
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143 | } // if |
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144 | } else { |
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145 | PRINT( std::cerr << "reference to rvalue conversion" << std::endl; ) |
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146 | PassVisitor<ConversionCost> converter( |
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147 | dest, srcIsLvalue, indexer, env, |
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148 | (Cost (*)(const Type *, const Type *, bool, const SymTab::Indexer&, const TypeEnvironment&)) |
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149 | conversionCost ); |
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150 | src->accept( converter ); |
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151 | return converter.pass.get_cost(); |
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152 | } // if |
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153 | } else { |
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154 | const ReferenceType * destAsRef = dynamic_cast< const ReferenceType * >( dest ); |
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155 | assert( diff == -1 && destAsRef ); |
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156 | PRINT( std::cerr << "dest is: " << dest << " / src is: " << src << std::endl; ) |
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157 | if ( typesCompatibleIgnoreQualifiers( src, destAsRef->base, indexer, env ) ) { |
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158 | PRINT( std::cerr << "converting compatible base type" << std::endl; ) |
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159 | if ( srcIsLvalue ) { |
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160 | PRINT( |
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161 | std::cerr << "lvalue to reference conversion" << std::endl; |
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162 | std::cerr << src << " => " << destAsRef << std::endl; |
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163 | ) |
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164 | // lvalue-to-reference conversion: cv lvalue T => cv T & |
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165 | if ( src->tq == destAsRef->base->tq ) { |
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166 | return Cost::reference; // cost needs to be non-zero to add cast |
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167 | } if ( src->tq < destAsRef->base->tq ) { |
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168 | return Cost::safe; // cost needs to be higher than previous cast to differentiate adding qualifiers vs. keeping same |
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169 | } else { |
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170 | return Cost::unsafe; |
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171 | } // if |
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172 | } else if ( destAsRef->base->get_const() ) { |
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173 | PRINT( std::cerr << "rvalue to const ref conversion" << std::endl; ) |
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174 | // rvalue-to-const-reference conversion: T => const T & |
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175 | return Cost::safe; |
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176 | } else { |
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177 | PRINT( std::cerr << "rvalue to non-const reference conversion" << std::endl; ) |
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178 | // rvalue-to-reference conversion: T => T & |
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179 | return Cost::unsafe; |
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180 | } // if |
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181 | } // if |
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182 | PRINT( std::cerr << "attempting to convert from incompatible base type -- fail" << std::endl; ) |
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183 | } |
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184 | return Cost::infinity; |
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185 | } |
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186 | |
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187 | Cost convertToReferenceCost( const Type * src, const ReferenceType * dest, bool srcIsLvalue, |
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188 | const SymTab::Indexer & indexer, const TypeEnvironment & env, PtrsFunction func ) { |
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189 | int sdepth = src->referenceDepth(), ddepth = dest->referenceDepth(); |
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190 | Cost cost = convertToReferenceCost( src, dest, srcIsLvalue, sdepth-ddepth, indexer, env, func ); |
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191 | PRINT( std::cerr << "convertToReferenceCost result: " << cost << std::endl; ) |
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192 | return cost; |
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193 | } |
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194 | |
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195 | ConversionCost::ConversionCost( const Type * dest, bool srcIsLvalue, const SymTab::Indexer &indexer, const TypeEnvironment &env, CostFunction costFunc ) |
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196 | : dest( dest ), srcIsLvalue( srcIsLvalue ), indexer( indexer ), cost( Cost::infinity ), env( env ), costFunc( costFunc ) { |
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197 | } |
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198 | |
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199 | // GENERATED START, DO NOT EDIT |
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200 | // GENERATED BY BasicTypes-gen.cc |
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201 | /* EXTENDED INTEGRAL RANK HIERARCHY (root to leaves) |
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202 | _Bool |
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203 | char signed char unsigned char |
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204 | signed short int unsigned short int |
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205 | signed int unsigned int |
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206 | signed long int unsigned long int |
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207 | signed long long int unsigned long long int |
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208 | __int128 unsigned __int128 |
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209 | _Float16 _Float16 _Complex |
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210 | _Float32 _Float32 _Complex |
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211 | float float _Complex |
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212 | _Float32x _Float32x _Complex |
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213 | _Float64 _Float64 _Complex |
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214 | double double _Complex |
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215 | _Float64x _Float64x _Complex |
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216 | __float80 |
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217 | _Float128 _Float128 _Complex |
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218 | __float128 |
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219 | long double long double _Complex |
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220 | _Float128x _Float128x _Complex |
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221 | */ |
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222 | // GENERATED END |
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223 | |
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224 | // GENERATED START, DO NOT EDIT |
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225 | // GENERATED BY BasicTypes-gen.cc |
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226 | static const int costMatrix[BasicType::NUMBER_OF_BASIC_TYPES][BasicType::NUMBER_OF_BASIC_TYPES] = { // path length from root to node |
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227 | /* B C SC UC SI SUI I UI LI LUI LLI LLUI IB UIB _FH _FH _F _FC F FC _FX _FXC FD _FDC D DC F80X_FDXC F80 _FB_FLDC FB LD LDC _FBX_FLDXC */ |
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228 | /* B */ { 0, 1, 1, 2, 2, 3, 3, 4, 4, 5, 5, 6, 6, 7, 7, 8, 8, 9, 9, 10, 10, 11, 11, 12, 12, 13, 13, 14, 14, 15, 15, 16, 17, 16, 18, 17, }, |
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229 | /* C */ { -1, 0, 1, 1, 1, 2, 2, 3, 3, 4, 4, 5, 5, 6, 6, 7, 7, 8, 8, 9, 9, 10, 10, 11, 11, 12, 12, 13, 13, 14, 14, 15, 16, 15, 17, 16, }, |
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230 | /* SC */ { -1, -1, 0, 1, 1, 2, 2, 3, 3, 4, 4, 5, 5, 6, 6, 7, 7, 8, 8, 9, 9, 10, 10, 11, 11, 12, 12, 13, 13, 14, 14, 15, 16, 15, 17, 16, }, |
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231 | /* UC */ { -1, -1, -1, 0, 1, 1, 2, 2, 3, 3, 4, 4, 5, 5, 6, 7, 7, 8, 8, 9, 9, 10, 10, 11, 11, 12, 12, 13, 13, 14, 14, 15, 16, 15, 17, 16, }, |
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232 | /* SI */ { -1, -1, -1, -1, 0, 1, 1, 2, 2, 3, 3, 4, 4, 5, 5, 6, 6, 7, 7, 8, 8, 9, 9, 10, 10, 11, 11, 12, 12, 13, 13, 14, 15, 14, 16, 15, }, |
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233 | /* SUI */ { -1, -1, -1, -1, -1, 0, 1, 1, 2, 2, 3, 3, 4, 4, 5, 6, 6, 7, 7, 8, 8, 9, 9, 10, 10, 11, 11, 12, 12, 13, 13, 14, 15, 14, 16, 15, }, |
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234 | /* I */ { -1, -1, -1, -1, -1, -1, 0, 1, 1, 2, 2, 3, 3, 4, 4, 5, 5, 6, 6, 7, 7, 8, 8, 9, 9, 10, 10, 11, 11, 12, 12, 13, 14, 13, 15, 14, }, |
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235 | /* UI */ { -1, -1, -1, -1, -1, -1, -1, 0, 1, 1, 2, 2, 3, 3, 4, 5, 5, 6, 6, 7, 7, 8, 8, 9, 9, 10, 10, 11, 11, 12, 12, 13, 14, 13, 15, 14, }, |
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236 | /* LI */ { -1, -1, -1, -1, -1, -1, -1, -1, 0, 1, 1, 2, 2, 3, 3, 4, 4, 5, 5, 6, 6, 7, 7, 8, 8, 9, 9, 10, 10, 11, 11, 12, 13, 12, 14, 13, }, |
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237 | /* LUI */ { -1, -1, -1, -1, -1, -1, -1, -1, -1, 0, 1, 1, 2, 2, 3, 4, 4, 5, 5, 6, 6, 7, 7, 8, 8, 9, 9, 10, 10, 11, 11, 12, 13, 12, 14, 13, }, |
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238 | /* LLI */ { -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, 0, 1, 1, 2, 2, 3, 3, 4, 4, 5, 5, 6, 6, 7, 7, 8, 8, 9, 9, 10, 10, 11, 12, 11, 13, 12, }, |
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239 | /* LLUI */ { -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, 0, 1, 1, 2, 3, 3, 4, 4, 5, 5, 6, 6, 7, 7, 8, 8, 9, 9, 10, 10, 11, 12, 11, 13, 12, }, |
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240 | /* IB */ { -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, 0, 1, 1, 2, 2, 3, 3, 4, 4, 5, 5, 6, 6, 7, 7, 8, 8, 9, 9, 10, 11, 10, 12, 11, }, |
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241 | /* UIB */ { -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, 0, 1, 2, 2, 3, 3, 4, 4, 5, 5, 6, 6, 7, 7, 8, 8, 9, 9, 10, 11, 10, 12, 11, }, |
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242 | /* _FH */ { -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, 0, 1, 1, 2, 2, 3, 3, 4, 4, 5, 5, 6, 6, 7, 7, 8, 8, 9, 10, 9, 11, 10, }, |
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243 | /* _FH */ { -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, 0, -1, 1, -1, 2, -1, 3, -1, 4, -1, 5, -1, 6, -1, -1, 7, -1, -1, 8, -1, 9, }, |
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244 | /* _F */ { -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, 0, 1, 1, 2, 2, 3, 3, 4, 4, 5, 5, 6, 6, 7, 7, 8, 9, 8, 10, 9, }, |
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245 | /* _FC */ { -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, 0, -1, 1, -1, 2, -1, 3, -1, 4, -1, 5, -1, -1, 6, -1, -1, 7, -1, 8, }, |
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246 | /* F */ { -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, 0, 1, 1, 2, 2, 3, 3, 4, 4, 5, 5, 6, 6, 7, 8, 7, 9, 8, }, |
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247 | /* FC */ { -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, 0, -1, 1, -1, 2, -1, 3, -1, 4, -1, -1, 5, -1, -1, 6, -1, 7, }, |
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248 | /* _FX */ { -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, 0, 1, 1, 2, 2, 3, 3, 4, 4, 5, 5, 6, 7, 6, 8, 7, }, |
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249 | /* _FXC */ { -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, 0, -1, 1, -1, 2, -1, 3, -1, -1, 4, -1, -1, 5, -1, 6, }, |
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250 | /* FD */ { -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, 0, 1, 1, 2, 2, 3, 3, 4, 4, 5, 6, 5, 7, 6, }, |
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251 | /* _FDC */ { -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, 0, -1, 1, -1, 2, -1, -1, 3, -1, -1, 4, -1, 5, }, |
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252 | /* D */ { -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, 0, 1, 1, 2, 2, 3, 3, 4, 5, 4, 6, 5, }, |
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253 | /* DC */ { -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, 0, -1, 1, -1, -1, 2, -1, -1, 3, -1, 4, }, |
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254 | /* F80X */ { -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, 0, 1, 1, 2, 2, 3, 4, 3, 5, 4, }, |
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255 | /* _FDXC */ { -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, 0, -1, -1, 1, -1, -1, 2, -1, 3, }, |
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256 | /* F80 */ { -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, 1, 0, 1, 2, 2, 3, 3, 4, 4, }, |
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257 | /* _FB */ { -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, 0, 1, 1, 2, 2, 3, 3, }, |
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258 | /* _FLDC */ { -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, 0, -1, -1, 1, -1, 2, }, |
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259 | /* FB */ { -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, 1, 0, 1, 2, 2, 3, }, |
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260 | /* LD */ { -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, 0, 1, 1, 2, }, |
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261 | /* LDC */ { -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, 0, -1, 1, }, |
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262 | /* _FBX */ { -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, 0, 1, }, |
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263 | /* _FLDXC */ { -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, 0, }, |
---|
264 | }; // costMatrix |
---|
265 | static const int maxIntCost = 15; |
---|
266 | // GENERATED END |
---|
267 | static_assert( |
---|
268 | sizeof(costMatrix)/sizeof(costMatrix[0][0]) == BasicType::NUMBER_OF_BASIC_TYPES * BasicType::NUMBER_OF_BASIC_TYPES, |
---|
269 | "Missing row in the cost matrix" |
---|
270 | ); |
---|
271 | |
---|
272 | // GENERATED START, DO NOT EDIT |
---|
273 | // GENERATED BY BasicTypes-gen.cc |
---|
274 | static const int signMatrix[BasicType::NUMBER_OF_BASIC_TYPES][BasicType::NUMBER_OF_BASIC_TYPES] = { // number of sign changes in safe conversion |
---|
275 | /* B C SC UC SI SUI I UI LI LUI LLI LLUI IB UIB _FH _FH _F _FC F FC _FX _FXC FD _FDC D DC F80X_FDXC F80 _FB_FLDC FB LD LDC _FBX_FLDXC */ |
---|
276 | /* B */ { 0, 0, 0, 1, 0, 1, 0, 1, 0, 1, 0, 1, 0, 1, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, }, |
---|
277 | /* C */ { -1, 0, 0, 1, 0, 1, 0, 1, 0, 1, 0, 1, 0, 1, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, }, |
---|
278 | /* SC */ { -1, -1, 0, 1, 0, 1, 0, 1, 0, 1, 0, 1, 0, 1, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, }, |
---|
279 | /* UC */ { -1, -1, -1, 0, 1, 0, 1, 0, 1, 0, 1, 0, 1, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, }, |
---|
280 | /* SI */ { -1, -1, -1, -1, 0, 1, 0, 1, 0, 1, 0, 1, 0, 1, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, }, |
---|
281 | /* SUI */ { -1, -1, -1, -1, -1, 0, 1, 0, 1, 0, 1, 0, 1, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, }, |
---|
282 | /* I */ { -1, -1, -1, -1, -1, -1, 0, 1, 0, 1, 0, 1, 0, 1, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, }, |
---|
283 | /* UI */ { -1, -1, -1, -1, -1, -1, -1, 0, 1, 0, 1, 0, 1, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, }, |
---|
284 | /* LI */ { -1, -1, -1, -1, -1, -1, -1, -1, 0, 1, 0, 1, 0, 1, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, }, |
---|
285 | /* LUI */ { -1, -1, -1, -1, -1, -1, -1, -1, -1, 0, 1, 0, 1, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, }, |
---|
286 | /* LLI */ { -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, 0, 1, 0, 1, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, }, |
---|
287 | /* LLUI */ { -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, 0, 1, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, }, |
---|
288 | /* IB */ { -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, 0, 1, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, }, |
---|
289 | /* UIB */ { -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, }, |
---|
290 | /* _FH */ { -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, }, |
---|
291 | /* _FH */ { -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, 0, -1, 0, -1, 0, -1, 0, -1, 0, -1, 0, -1, 0, -1, -1, 0, -1, -1, 0, -1, 0, }, |
---|
292 | /* _F */ { -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, }, |
---|
293 | /* _FC */ { -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, 0, -1, 0, -1, 0, -1, 0, -1, 0, -1, 0, -1, -1, 0, -1, -1, 0, -1, 0, }, |
---|
294 | /* F */ { -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, }, |
---|
295 | /* FC */ { -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, 0, -1, 0, -1, 0, -1, 0, -1, 0, -1, -1, 0, -1, -1, 0, -1, 0, }, |
---|
296 | /* _FX */ { -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, }, |
---|
297 | /* _FXC */ { -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, 0, -1, 0, -1, 0, -1, 0, -1, -1, 0, -1, -1, 0, -1, 0, }, |
---|
298 | /* FD */ { -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, }, |
---|
299 | /* _FDC */ { -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, 0, -1, 0, -1, 0, -1, -1, 0, -1, -1, 0, -1, 0, }, |
---|
300 | /* D */ { -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, }, |
---|
301 | /* DC */ { -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, 0, -1, 0, -1, -1, 0, -1, -1, 0, -1, 0, }, |
---|
302 | /* F80X */ { -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, }, |
---|
303 | /* _FDXC */ { -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, 0, -1, -1, 0, -1, -1, 0, -1, 0, }, |
---|
304 | /* F80 */ { -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, 0, 0, 0, 0, 0, 0, 0, 0, 0, }, |
---|
305 | /* _FB */ { -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, 0, 0, 0, 0, 0, 0, 0, }, |
---|
306 | /* _FLDC */ { -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, 0, -1, -1, 0, -1, 0, }, |
---|
307 | /* FB */ { -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, 0, 0, 0, 0, 0, 0, }, |
---|
308 | /* LD */ { -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, 0, 0, 0, 0, }, |
---|
309 | /* LDC */ { -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, 0, -1, 0, }, |
---|
310 | /* _FBX */ { -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, 0, 0, }, |
---|
311 | /* _FLDXC */ { -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, 0, }, |
---|
312 | }; // signMatrix |
---|
313 | // GENERATED END |
---|
314 | static_assert( |
---|
315 | sizeof(signMatrix)/sizeof(signMatrix[0][0]) == BasicType::NUMBER_OF_BASIC_TYPES * BasicType::NUMBER_OF_BASIC_TYPES, |
---|
316 | "Missing row in the sign matrix" |
---|
317 | ); |
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318 | |
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319 | void ConversionCost::postvisit( const VoidType * ) { |
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320 | cost = Cost::infinity; |
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321 | } |
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322 | |
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323 | void ConversionCost::postvisit(const BasicType * basicType) { |
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324 | if ( const BasicType * destAsBasic = dynamic_cast< const BasicType * >( dest ) ) { |
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325 | int tableResult = costMatrix[ basicType->kind ][ destAsBasic->kind ]; |
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326 | if ( tableResult == -1 ) { |
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327 | cost = Cost::unsafe; |
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328 | } else { |
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329 | cost = Cost::zero; |
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330 | cost.incSafe( tableResult ); |
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331 | cost.incSign( signMatrix[ basicType->kind ][ destAsBasic->kind ] ); |
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332 | } // if |
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333 | } else if ( dynamic_cast< const EnumInstType * >( dest ) ) { |
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334 | // xxx - not positive this is correct, but appears to allow casting int => enum |
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335 | cost = Cost::unsafe; |
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336 | } // if |
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337 | // no cases for zero_t/one_t because it should not be possible to convert int, etc. to zero_t/one_t. |
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338 | } |
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339 | |
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340 | void ConversionCost::postvisit( const PointerType * pointerType ) { |
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341 | if ( const PointerType * destAsPtr = dynamic_cast< const PointerType * >( dest ) ) { |
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342 | PRINT( std::cerr << pointerType << " ===> " << destAsPtr << std::endl; ) |
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343 | Type::Qualifiers tq1 = pointerType->base->tq; |
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344 | Type::Qualifiers tq2 = destAsPtr->base->tq; |
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345 | if ( tq1 <= tq2 && typesCompatibleIgnoreQualifiers( pointerType->base, destAsPtr->base, indexer, env ) ) { |
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346 | PRINT( std::cerr << " :: compatible and good qualifiers" << std::endl; ) |
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347 | if ( tq1 == tq2 ) { |
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348 | // types are the same |
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349 | cost = Cost::zero; |
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350 | } else { |
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351 | // types are the same, except otherPointer has more qualifiers |
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352 | cost = Cost::safe; |
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353 | } // if |
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354 | } else { |
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355 | int assignResult = ptrsAssignable( pointerType->base, destAsPtr->base, env ); |
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356 | PRINT( std::cerr << " :: " << assignResult << std::endl; ) |
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357 | if ( assignResult > 0 && tq1 <= tq2 ) { |
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358 | // xxx - want the case where qualifiers are added to be more expensive than the case where qualifiers are the same. Is 1 safe vs. 2 safe correct? |
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359 | if ( tq1 == tq2 ) { |
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360 | cost = Cost::safe; |
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361 | } else if ( tq1 < tq2 ) { |
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362 | cost = Cost::safe+Cost::safe; |
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363 | } |
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364 | } else if ( assignResult < 0 ) { |
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365 | cost = Cost::unsafe; |
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366 | } // if |
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367 | // assignResult == 0 means Cost::Infinity |
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368 | } // if |
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369 | // case case for zero_t because it should not be possible to convert pointers to zero_t. |
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370 | } // if |
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371 | } |
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372 | |
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373 | void ConversionCost::postvisit( const ArrayType * ) {} |
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374 | |
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375 | void ConversionCost::postvisit( const ReferenceType * refType ) { |
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376 | // Note: dest can never be a reference, since it would have been caught in an earlier check |
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377 | assert( ! dynamic_cast< const ReferenceType * >( dest ) ); |
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378 | // convert reference to rvalue: cv T1 & => T2 |
---|
379 | // recursively compute conversion cost from T1 to T2. |
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380 | // cv can be safely dropped because of 'implicit dereference' behavior. |
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381 | cost = costFunc( refType->base, dest, srcIsLvalue, indexer, env ); |
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382 | if ( refType->base->tq == dest->tq ) { |
---|
383 | cost.incReference(); // prefer exact qualifiers |
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384 | } else if ( refType->base->tq < dest->tq ) { |
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385 | cost.incSafe(); // then gaining qualifiers |
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386 | } else { |
---|
387 | cost.incUnsafe(); // lose qualifiers as last resort |
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388 | } |
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389 | PRINT( std::cerr << refType << " ==> " << dest << " " << cost << std::endl; ) |
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390 | } |
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391 | |
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392 | void ConversionCost::postvisit( const FunctionType * ) {} |
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393 | |
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394 | void ConversionCost::postvisit( const StructInstType * inst ) { |
---|
395 | if ( const StructInstType * destAsInst = dynamic_cast< const StructInstType * >( dest ) ) { |
---|
396 | if ( inst->name == destAsInst->name ) { |
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397 | cost = Cost::zero; |
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398 | } // if |
---|
399 | } // if |
---|
400 | } |
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401 | |
---|
402 | void ConversionCost::postvisit( const UnionInstType * inst ) { |
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403 | if ( const UnionInstType * destAsInst = dynamic_cast< const UnionInstType * >( dest ) ) { |
---|
404 | if ( inst->name == destAsInst->name ) { |
---|
405 | cost = Cost::zero; |
---|
406 | } // if |
---|
407 | } // if |
---|
408 | } |
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409 | |
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410 | void ConversionCost::postvisit( const EnumInstType * ) { |
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411 | static Type::Qualifiers q; |
---|
412 | static BasicType integer( q, BasicType::SignedInt ); |
---|
413 | cost = costFunc( &integer, dest, srcIsLvalue, indexer, env ); // safe if dest >= int |
---|
414 | if ( cost < Cost::unsafe ) { |
---|
415 | cost.incSafe(); |
---|
416 | } // if |
---|
417 | } |
---|
418 | |
---|
419 | void ConversionCost::postvisit( const TraitInstType * ) {} |
---|
420 | |
---|
421 | void ConversionCost::postvisit( const TypeInstType * inst ) { |
---|
422 | if ( const EqvClass * eqvClass = env.lookup( inst->name ) ) { |
---|
423 | cost = costFunc( eqvClass->type, dest, srcIsLvalue, indexer, env ); |
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424 | } else if ( const TypeInstType * destAsInst = dynamic_cast< const TypeInstType * >( dest ) ) { |
---|
425 | if ( inst->name == destAsInst->name ) { |
---|
426 | cost = Cost::zero; |
---|
427 | } |
---|
428 | } else if ( const NamedTypeDecl * namedType = indexer.lookupType( inst->name ) ) { |
---|
429 | const TypeDecl * type = dynamic_cast< const TypeDecl * >( namedType ); |
---|
430 | // all typedefs should be gone by this point |
---|
431 | assert( type ); |
---|
432 | if ( type->base ) { |
---|
433 | cost = costFunc( type->base, dest, srcIsLvalue, indexer, env ) + Cost::safe; |
---|
434 | } // if |
---|
435 | } // if |
---|
436 | } |
---|
437 | |
---|
438 | void ConversionCost::postvisit( const TupleType * tupleType ) { |
---|
439 | Cost c = Cost::zero; |
---|
440 | if ( const TupleType * destAsTuple = dynamic_cast< const TupleType * >( dest ) ) { |
---|
441 | std::list< Type * >::const_iterator srcIt = tupleType->types.begin(); |
---|
442 | std::list< Type * >::const_iterator destIt = destAsTuple->types.begin(); |
---|
443 | while ( srcIt != tupleType->types.end() && destIt != destAsTuple->types.end() ) { |
---|
444 | Cost newCost = costFunc( * srcIt++, * destIt++, srcIsLvalue, indexer, env ); |
---|
445 | if ( newCost == Cost::infinity ) { |
---|
446 | return; |
---|
447 | } // if |
---|
448 | c += newCost; |
---|
449 | } // while |
---|
450 | if ( destIt != destAsTuple->types.end() ) { |
---|
451 | cost = Cost::infinity; |
---|
452 | } else { |
---|
453 | cost = c; |
---|
454 | } // if |
---|
455 | } // if |
---|
456 | } |
---|
457 | |
---|
458 | void ConversionCost::postvisit( const VarArgsType * ) { |
---|
459 | if ( dynamic_cast< const VarArgsType * >( dest ) ) { |
---|
460 | cost = Cost::zero; |
---|
461 | } |
---|
462 | } |
---|
463 | |
---|
464 | void ConversionCost::postvisit( const ZeroType * ) { |
---|
465 | if ( dynamic_cast< const ZeroType * >( dest ) ) { |
---|
466 | cost = Cost::zero; |
---|
467 | } else if ( const BasicType * destAsBasic = dynamic_cast< const BasicType * >( dest ) ) { |
---|
468 | // copied from visit(BasicType *) for signed int, but +1 for safe conversions |
---|
469 | int tableResult = costMatrix[ BasicType::SignedInt ][ destAsBasic->kind ]; |
---|
470 | if ( tableResult == -1 ) { |
---|
471 | cost = Cost::unsafe; |
---|
472 | } else { |
---|
473 | cost = Cost::zero; |
---|
474 | cost.incSafe( tableResult + 1 ); |
---|
475 | cost.incSign( signMatrix[ BasicType::SignedInt ][ destAsBasic->kind ] ); |
---|
476 | } // if |
---|
477 | } else if ( dynamic_cast< const PointerType * >( dest ) ) { |
---|
478 | cost = Cost::zero; |
---|
479 | cost.incSafe( maxIntCost + 2 ); // +1 for zero_t -> int, +1 for disambiguation |
---|
480 | } // if |
---|
481 | } |
---|
482 | |
---|
483 | void ConversionCost::postvisit( const OneType * ) { |
---|
484 | if ( dynamic_cast< const OneType * >( dest ) ) { |
---|
485 | cost = Cost::zero; |
---|
486 | } else if ( const BasicType * destAsBasic = dynamic_cast< const BasicType * >( dest ) ) { |
---|
487 | // copied from visit(BasicType *) for signed int, but +1 for safe conversions |
---|
488 | int tableResult = costMatrix[ BasicType::SignedInt ][ destAsBasic->kind ]; |
---|
489 | if ( tableResult == -1 ) { |
---|
490 | cost = Cost::unsafe; |
---|
491 | } else { |
---|
492 | cost = Cost::zero; |
---|
493 | cost.incSafe( tableResult + 1 ); |
---|
494 | cost.incSign( signMatrix[ BasicType::SignedInt ][ destAsBasic->kind ] ); |
---|
495 | } // if |
---|
496 | } // if |
---|
497 | } |
---|
498 | |
---|
499 | namespace { |
---|
500 | # warning For overload resolution between the two versions. |
---|
501 | int localPtrsAssignable(const ast::Type * t1, const ast::Type * t2, |
---|
502 | const ast::SymbolTable &, const ast::TypeEnvironment & env ) { |
---|
503 | return ptrsAssignable( t1, t2, env ); |
---|
504 | } |
---|
505 | Cost localConversionCost( |
---|
506 | const ast::Type * src, const ast::Type * dst, bool srcIsLvalue, |
---|
507 | const ast::SymbolTable & symtab, const ast::TypeEnvironment & env |
---|
508 | ) { return conversionCost( src, dst, srcIsLvalue, symtab, env ); } |
---|
509 | } |
---|
510 | |
---|
511 | Cost conversionCost( |
---|
512 | const ast::Type * src, const ast::Type * dst, bool srcIsLvalue, |
---|
513 | const ast::SymbolTable & symtab, const ast::TypeEnvironment & env |
---|
514 | ) { |
---|
515 | if ( const ast::TypeInstType * inst = dynamic_cast< const ast::TypeInstType * >( dst ) ) { |
---|
516 | if ( const ast::EqvClass * eqv = env.lookup( inst->name ) ) { |
---|
517 | if ( eqv->bound ) { |
---|
518 | return conversionCost(src, eqv->bound, srcIsLvalue, symtab, env ); |
---|
519 | } else { |
---|
520 | return Cost::infinity; |
---|
521 | } |
---|
522 | } else if ( const ast::NamedTypeDecl * named = symtab.lookupType( inst->name ) ) { |
---|
523 | const ast::TypeDecl * type = dynamic_cast< const ast::TypeDecl * >( named ); |
---|
524 | assertf( type, "Unexpected typedef." ); |
---|
525 | if ( type->base ) { |
---|
526 | return conversionCost( src, type->base, srcIsLvalue, symtab, env ) + Cost::safe; |
---|
527 | } |
---|
528 | } |
---|
529 | } |
---|
530 | if ( typesCompatibleIgnoreQualifiers( src, dst, symtab, env ) ) { |
---|
531 | return Cost::zero; |
---|
532 | } else if ( dynamic_cast< const ast::VoidType * >( dst ) ) { |
---|
533 | return Cost::safe; |
---|
534 | } else if ( const ast::ReferenceType * refType = |
---|
535 | dynamic_cast< const ast::ReferenceType * >( dst ) ) { |
---|
536 | return convertToReferenceCost( src, refType, srcIsLvalue, symtab, env, localPtrsAssignable ); |
---|
537 | } else { |
---|
538 | ast::Pass<ConversionCost_new> converter( dst, srcIsLvalue, symtab, env, localConversionCost ); |
---|
539 | src->accept( converter ); |
---|
540 | return converter.pass.cost; |
---|
541 | } |
---|
542 | } |
---|
543 | |
---|
544 | static Cost convertToReferenceCost( const ast::Type * src, const ast::Type * dst, bool srcIsLvalue, |
---|
545 | int diff, const ast::SymbolTable & symtab, const ast::TypeEnvironment & env, |
---|
546 | PtrsCalculation func ) { |
---|
547 | if ( 0 < diff ) { |
---|
548 | Cost cost = convertToReferenceCost( |
---|
549 | strict_dynamic_cast< const ast::ReferenceType * >( src )->base, dst, |
---|
550 | srcIsLvalue, (diff - 1), symtab, env, func ); |
---|
551 | cost.incReference(); |
---|
552 | return cost; |
---|
553 | } else if ( diff < -1 ) { |
---|
554 | Cost cost = convertToReferenceCost( |
---|
555 | src, strict_dynamic_cast< const ast::ReferenceType * >( dst )->base, |
---|
556 | srcIsLvalue, (diff + 1), symtab, env, func ); |
---|
557 | cost.incReference(); |
---|
558 | return cost; |
---|
559 | } else if ( 0 == diff ) { |
---|
560 | const ast::ReferenceType * srcAsRef = dynamic_cast< const ast::ReferenceType * >( src ); |
---|
561 | const ast::ReferenceType * dstAsRef = dynamic_cast< const ast::ReferenceType * >( dst ); |
---|
562 | if ( srcAsRef && dstAsRef ) { |
---|
563 | ast::CV::Qualifiers tq1 = srcAsRef->base->qualifiers; |
---|
564 | ast::CV::Qualifiers tq2 = dstAsRef->base->qualifiers; |
---|
565 | if ( tq1 <= tq2 && typesCompatibleIgnoreQualifiers( |
---|
566 | srcAsRef->base, dstAsRef->base, symtab, env ) ) { |
---|
567 | if ( tq1 == tq2 ) { |
---|
568 | return Cost::zero; |
---|
569 | } else { |
---|
570 | return Cost::safe; |
---|
571 | } |
---|
572 | } else { |
---|
573 | int assignResult = func( srcAsRef->base, dstAsRef->base, symtab, env ); |
---|
574 | if ( 0 < assignResult ) { |
---|
575 | return Cost::safe; |
---|
576 | } else if ( assignResult < 0 ) { |
---|
577 | return Cost::unsafe; |
---|
578 | } |
---|
579 | } |
---|
580 | } else { |
---|
581 | ast::Pass<ConversionCost_new> converter( dst, srcIsLvalue, symtab, env, localConversionCost ); |
---|
582 | src->accept( converter ); |
---|
583 | return converter.pass.cost; |
---|
584 | } |
---|
585 | } else { |
---|
586 | assert( -1 == diff ); |
---|
587 | const ast::ReferenceType * dstAsRef = dynamic_cast< const ast::ReferenceType * >( dst ); |
---|
588 | assert( dstAsRef ); |
---|
589 | if ( typesCompatibleIgnoreQualifiers( src, dstAsRef->base, symtab, env ) ) { |
---|
590 | if ( srcIsLvalue ) { |
---|
591 | if ( src->qualifiers == dstAsRef->base->qualifiers ) { |
---|
592 | return Cost::reference; |
---|
593 | } else if ( src->qualifiers < dstAsRef->base->qualifiers ) { |
---|
594 | return Cost::safe; |
---|
595 | } else { |
---|
596 | return Cost::unsafe; |
---|
597 | } |
---|
598 | } else if ( dstAsRef->base->is_const() ) { |
---|
599 | return Cost::safe; |
---|
600 | } else { |
---|
601 | return Cost::unsafe; |
---|
602 | } |
---|
603 | } |
---|
604 | } |
---|
605 | return Cost::infinity; |
---|
606 | } |
---|
607 | |
---|
608 | Cost convertToReferenceCost( const ast::Type * src, const ast::ReferenceType * dst, |
---|
609 | bool srcIsLvalue, const ast::SymbolTable & symtab, const ast::TypeEnvironment & env, |
---|
610 | PtrsCalculation func ) { |
---|
611 | int sdepth = src->referenceDepth(), ddepth = dst->referenceDepth(); |
---|
612 | return convertToReferenceCost( src, dst, srcIsLvalue, sdepth - ddepth, symtab, env, func ); |
---|
613 | } |
---|
614 | |
---|
615 | void ConversionCost_new::postvisit( const ast::VoidType * voidType ) { |
---|
616 | (void)voidType; |
---|
617 | cost = Cost::infinity; |
---|
618 | } |
---|
619 | |
---|
620 | void ConversionCost_new::postvisit( const ast::BasicType * basicType ) { |
---|
621 | if ( const ast::BasicType * dstAsBasic = dynamic_cast< const ast::BasicType * >( dst ) ) { |
---|
622 | int tableResult = costMatrix[ basicType->kind ][ dstAsBasic->kind ]; |
---|
623 | if ( tableResult == -1 ) { |
---|
624 | cost = Cost::unsafe; |
---|
625 | } else { |
---|
626 | cost = Cost::zero; |
---|
627 | cost.incSafe( tableResult ); |
---|
628 | cost.incSign( signMatrix[ basicType->kind ][ dstAsBasic->kind ] ); |
---|
629 | } |
---|
630 | } else if ( dynamic_cast< const ast::EnumInstType * >( dst ) ) { |
---|
631 | // xxx - not positive this is correct, but appears to allow casting int => enum |
---|
632 | cost = Cost::unsafe; |
---|
633 | } |
---|
634 | } |
---|
635 | |
---|
636 | void ConversionCost_new::postvisit( const ast::PointerType * pointerType ) { |
---|
637 | if ( const ast::PointerType * dstAsPtr = dynamic_cast< const ast::PointerType * >( dst ) ) { |
---|
638 | ast::CV::Qualifiers tq1 = pointerType->base->qualifiers; |
---|
639 | ast::CV::Qualifiers tq2 = dstAsPtr->base->qualifiers; |
---|
640 | if ( tq1 <= tq2 && typesCompatibleIgnoreQualifiers( |
---|
641 | pointerType->base, dstAsPtr->base, symtab, env ) ) { |
---|
642 | if ( tq1 == tq2 ) { |
---|
643 | cost = Cost::zero; |
---|
644 | } else { |
---|
645 | cost = Cost::safe; |
---|
646 | } |
---|
647 | } else { |
---|
648 | int assignResult = ptrsAssignable( pointerType->base, dstAsPtr->base, env ); |
---|
649 | if ( 0 < assignResult && tq1 <= tq2 ) { |
---|
650 | if ( tq1 == tq2 ) { |
---|
651 | cost = Cost::safe; |
---|
652 | } else { |
---|
653 | cost = Cost::safe + Cost::safe; |
---|
654 | } |
---|
655 | } else if ( assignResult < 0 ) { |
---|
656 | cost = Cost::unsafe; |
---|
657 | } // else Cost::infinity |
---|
658 | } |
---|
659 | } |
---|
660 | } |
---|
661 | |
---|
662 | void ConversionCost_new::postvisit( const ast::ArrayType * arrayType ) { |
---|
663 | (void)arrayType; |
---|
664 | } |
---|
665 | |
---|
666 | void ConversionCost_new::postvisit( const ast::ReferenceType * refType ) { |
---|
667 | assert( nullptr == dynamic_cast< const ast::ReferenceType * >( dst ) ); |
---|
668 | |
---|
669 | cost = costCalc( refType->base, dst, srcIsLvalue, symtab, env ); |
---|
670 | if ( refType->base->qualifiers == dst->qualifiers ) { |
---|
671 | cost.incReference(); |
---|
672 | } else if ( refType->base->qualifiers < dst->qualifiers ) { |
---|
673 | cost.incSafe(); |
---|
674 | } else { |
---|
675 | cost.incUnsafe(); |
---|
676 | } |
---|
677 | } |
---|
678 | |
---|
679 | void ConversionCost_new::postvisit( const ast::FunctionType * functionType ) { |
---|
680 | (void)functionType; |
---|
681 | } |
---|
682 | |
---|
683 | void ConversionCost_new::postvisit( const ast::StructInstType * structInstType ) { |
---|
684 | if ( const ast::StructInstType * dstAsInst = |
---|
685 | dynamic_cast< const ast::StructInstType * >( dst ) ) { |
---|
686 | if ( structInstType->name == dstAsInst->name ) { |
---|
687 | cost = Cost::zero; |
---|
688 | } |
---|
689 | } |
---|
690 | } |
---|
691 | |
---|
692 | void ConversionCost_new::postvisit( const ast::UnionInstType * unionInstType ) { |
---|
693 | if ( const ast::UnionInstType * dstAsInst = |
---|
694 | dynamic_cast< const ast::UnionInstType * >( dst ) ) { |
---|
695 | if ( unionInstType->name == dstAsInst->name ) { |
---|
696 | cost = Cost::zero; |
---|
697 | } |
---|
698 | } |
---|
699 | } |
---|
700 | |
---|
701 | void ConversionCost_new::postvisit( const ast::EnumInstType * enumInstType ) { |
---|
702 | (void)enumInstType; |
---|
703 | static ast::ptr<ast::BasicType> integer = { new ast::BasicType( ast::BasicType::SignedInt ) }; |
---|
704 | cost = costCalc( integer, dst, srcIsLvalue, symtab, env ); |
---|
705 | if ( cost < Cost::unsafe ) { |
---|
706 | cost.incSafe(); |
---|
707 | } |
---|
708 | } |
---|
709 | |
---|
710 | void ConversionCost_new::postvisit( const ast::TraitInstType * traitInstType ) { |
---|
711 | (void)traitInstType; |
---|
712 | } |
---|
713 | |
---|
714 | void ConversionCost_new::postvisit( const ast::TypeInstType * typeInstType ) { |
---|
715 | if ( const ast::EqvClass * eqv = env.lookup( typeInstType->name ) ) { |
---|
716 | cost = costCalc( eqv->bound, dst, srcIsLvalue, symtab, env ); |
---|
717 | } else if ( const ast::TypeInstType * dstAsInst = |
---|
718 | dynamic_cast< const ast::TypeInstType * >( dst ) ) { |
---|
719 | if ( typeInstType->name == dstAsInst->name ) { |
---|
720 | cost = Cost::zero; |
---|
721 | } |
---|
722 | } else if ( const ast::NamedTypeDecl * namedType = symtab.lookupType( typeInstType->name ) ) { |
---|
723 | const ast::TypeDecl * type = dynamic_cast< const ast::TypeDecl * >( namedType ); |
---|
724 | assertf( type, "Unexpected typedef."); |
---|
725 | if ( type->base ) { |
---|
726 | cost = costCalc( type->base, dst, srcIsLvalue, symtab, env ) + Cost::safe; |
---|
727 | } |
---|
728 | } |
---|
729 | } |
---|
730 | |
---|
731 | void ConversionCost_new::postvisit( const ast::TupleType * tupleType ) { |
---|
732 | Cost c = Cost::zero; |
---|
733 | if ( const ast::TupleType * dstAsTuple = dynamic_cast< const ast::TupleType * >( dst ) ) { |
---|
734 | auto srcIt = tupleType->types.begin(); |
---|
735 | auto dstIt = dstAsTuple->types.begin(); |
---|
736 | auto srcEnd = tupleType->types.end(); |
---|
737 | auto dstEnd = dstAsTuple->types.end(); |
---|
738 | while ( srcIt != srcEnd && dstIt != dstEnd ) { |
---|
739 | Cost newCost = costCalc( * srcIt++, * dstIt++, srcIsLvalue, symtab, env ); |
---|
740 | if ( newCost == Cost::infinity ) { |
---|
741 | return; |
---|
742 | } |
---|
743 | c += newCost; |
---|
744 | } |
---|
745 | if ( dstIt != dstEnd ) { |
---|
746 | cost = Cost::infinity; |
---|
747 | } else { |
---|
748 | cost = c; |
---|
749 | } |
---|
750 | } |
---|
751 | } |
---|
752 | |
---|
753 | void ConversionCost_new::postvisit( const ast::VarArgsType * varArgsType ) { |
---|
754 | (void)varArgsType; |
---|
755 | if ( dynamic_cast< const ast::VarArgsType * >( dst ) ) { |
---|
756 | cost = Cost::zero; |
---|
757 | } |
---|
758 | } |
---|
759 | |
---|
760 | void ConversionCost_new::postvisit( const ast::ZeroType * zeroType ) { |
---|
761 | (void)zeroType; |
---|
762 | if ( dynamic_cast< const ast::ZeroType * >( dst ) ) { |
---|
763 | cost = Cost::zero; |
---|
764 | } else if ( const ast::BasicType * dstAsBasic = |
---|
765 | dynamic_cast< const ast::BasicType * >( dst ) ) { |
---|
766 | int tableResult = costMatrix[ ast::BasicType::SignedInt ][ dstAsBasic->kind ]; |
---|
767 | if ( -1 == tableResult ) { |
---|
768 | cost = Cost::unsafe; |
---|
769 | } else { |
---|
770 | cost = Cost::zero; |
---|
771 | cost.incSafe( tableResult + 1 ); |
---|
772 | cost.incSign( signMatrix[ ast::BasicType::SignedInt ][ dstAsBasic->kind ] ); |
---|
773 | } |
---|
774 | } else if ( dynamic_cast< const ast::PointerType * >( dst ) ) { |
---|
775 | cost = Cost::zero; |
---|
776 | // +1 for zero_t ->, +1 for disambiguation |
---|
777 | cost.incSafe( maxIntCost + 2 ); |
---|
778 | } |
---|
779 | } |
---|
780 | |
---|
781 | void ConversionCost_new::postvisit( const ast::OneType * oneType ) { |
---|
782 | (void)oneType; |
---|
783 | if ( dynamic_cast< const ast::OneType * >( dst ) ) { |
---|
784 | cost = Cost::zero; |
---|
785 | } else if ( const ast::BasicType * dstAsBasic = |
---|
786 | dynamic_cast< const ast::BasicType * >( dst ) ) { |
---|
787 | int tableResult = costMatrix[ ast::BasicType::SignedInt ][ dstAsBasic->kind ]; |
---|
788 | if ( -1 == tableResult ) { |
---|
789 | cost = Cost::unsafe; |
---|
790 | } else { |
---|
791 | cost = Cost::zero; |
---|
792 | cost.incSafe( tableResult + 1 ); |
---|
793 | cost.incSign( signMatrix[ ast::BasicType::SignedInt ][ dstAsBasic->kind ] ); |
---|
794 | } |
---|
795 | } |
---|
796 | } |
---|
797 | |
---|
798 | |
---|
799 | } // namespace ResolvExpr |
---|
800 | |
---|
801 | // Local Variables: // |
---|
802 | // tab-width: 4 // |
---|
803 | // mode: c++ // |
---|
804 | // compile-command: "make install" // |
---|
805 | // End: // |
---|