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: ConversionCost.cc,v 1.11 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 "ConversionCost.h" |
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9 | #include "typeops.h" |
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10 | #include "SynTree/Type.h" |
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11 | #include "SynTree/Visitor.h" |
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12 | #include "SymTab/Indexer.h" |
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13 | |
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14 | |
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15 | namespace ResolvExpr { |
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16 | |
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17 | const Cost Cost::zero = Cost( 0, 0, 0 ); |
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18 | const Cost Cost::infinity = Cost( -1, -1, -1 ); |
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19 | |
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20 | Cost |
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21 | conversionCost( Type *src, Type *dest, const SymTab::Indexer &indexer, const TypeEnvironment &env ) |
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22 | { |
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23 | if( TypeInstType *destAsTypeInst = dynamic_cast< TypeInstType* >( dest ) ) { |
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24 | EqvClass eqvClass; |
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25 | NamedTypeDecl *namedType; |
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26 | /// std::cout << "type inst " << destAsTypeInst->get_name(); |
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27 | if( env.lookup( destAsTypeInst->get_name(), eqvClass ) ) { |
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28 | return conversionCost( src, eqvClass.type, indexer, env ); |
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29 | } else if( ( namedType = indexer.lookupType( destAsTypeInst->get_name() ) ) ) { |
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30 | /// std::cout << " found" << std::endl; |
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31 | TypeDecl *type = dynamic_cast< TypeDecl* >( namedType ); |
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32 | // all typedefs should be gone by this point |
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33 | assert( type ); |
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34 | if( type->get_base() ) { |
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35 | return conversionCost( src, type->get_base(), indexer, env ) + Cost( 0, 0, 1 ); |
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36 | } |
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37 | } |
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38 | /// std::cout << " not found" << std::endl; |
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39 | } |
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40 | /// std::cout << "src is "; |
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41 | /// src->print( std::cout ); |
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42 | /// std::cout << std::endl << "dest is "; |
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43 | /// dest->print( std::cout ); |
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44 | /// std::cout << std::endl << "env is" << std::endl; |
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45 | /// env.print( std::cout, 8 ); |
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46 | if( typesCompatibleIgnoreQualifiers( src, dest, indexer, env ) ) { |
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47 | /// std::cout << "compatible!" << std::endl; |
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48 | return Cost( 0, 0, 0 ); |
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49 | } else if( dynamic_cast< VoidType* >( dest ) ) { |
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50 | return Cost( 0, 0, 1 ); |
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51 | } else { |
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52 | ConversionCost converter( dest, indexer, env ); |
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53 | src->accept( converter ); |
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54 | if( converter.get_cost() == Cost::infinity ) { |
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55 | return Cost::infinity; |
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56 | } else { |
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57 | return converter.get_cost() + Cost( 0, 0, 0 ); |
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58 | } |
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59 | } |
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60 | } |
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61 | |
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62 | ConversionCost::ConversionCost( Type *dest, const SymTab::Indexer &indexer, const TypeEnvironment &env ) |
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63 | : dest( dest ), indexer( indexer ), cost( Cost::infinity ), env( env ) |
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64 | { |
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65 | } |
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66 | |
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67 | /* |
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68 | Old |
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69 | === |
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70 | Double |
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71 | | |
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72 | Float |
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73 | | |
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74 | ULong |
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75 | / \ |
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76 | UInt Long |
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77 | \ / |
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78 | Int |
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79 | | |
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80 | Ushort |
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81 | | |
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82 | Short |
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83 | | |
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84 | Uchar |
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85 | / \ |
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86 | Schar Char |
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87 | |
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88 | New |
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89 | === |
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90 | +-----LongDoubleComplex--+ |
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91 | LongDouble--+ | +-LongDoubleImag |
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92 | | +---DoubleComplex---+ | |
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93 | Double------+ | +----DoubleImag |
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94 | | +-FloatComplex-+ | |
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95 | Float---------+ +-------FloatImag |
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96 | | |
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97 | ULongLong |
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98 | | |
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99 | LongLong |
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100 | | |
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101 | ULong |
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102 | / \ |
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103 | UInt Long |
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104 | \ / |
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105 | Int |
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106 | | |
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107 | Ushort |
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108 | | |
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109 | Short |
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110 | | |
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111 | Uchar |
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112 | / \ |
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113 | Schar Char |
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114 | \ / |
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115 | Bool |
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116 | */ |
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117 | |
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118 | static const int costMatrix[ BasicType::NUMBER_OF_BASIC_TYPES ][ BasicType::NUMBER_OF_BASIC_TYPES ] = |
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119 | { |
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120 | /* Src \ Dest: Bool Char SChar UChar Short UShort Int UInt Long ULong LLong ULLong Float Double LDbl FCplex DCplex LDCplex FImag DImag LDImag */ |
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121 | /* Bool */ { 0, 1, 1, 2, 3, 4, 5, 6, 6, 7, 8, 9, 10, 11, 12, 11, 12, 13, -1, -1, -1 }, |
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122 | /* Char */ { -1, 0, -1, 1, 2, 3, 4, 5, 5, 6, 7, 8, 9, 10, 11, 10, 11, 12, -1, -1, -1 }, |
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123 | /* SChar */ { -1, -1, 0, 1, 2, 3, 4, 5, 5, 6, 7, 8, 9, 10, 11, 10, 11, 12, -1, -1, -1 }, |
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124 | /* UChar */ { -1, -1, -1, 0, 1, 2, 3, 4, 4, 5, 6, 7, 8, 9, 10, 9, 10, 11, -1, -1, -1 }, |
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125 | /* Short */ { -1, -1, -1, -1, 0, 1, 2, 3, 3, 4, 5, 6, 7, 8, 9, 8, 9, 10, -1, -1, -1 }, |
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126 | /* UShort */ { -1, -1, -1, -1, -1, 0, 1, 2, 2, 3, 4, 5, 6, 7, 8, 7, 8, 9, -1, -1, -1 }, |
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127 | /* Int */ { -1, -1, -1, -1, -1, -1, 0, 1, 1, 2, 3, 4, 5, 6, 7, 6, 7, 8, -1, -1, -1 }, |
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128 | /* UInt */ { -1, -1, -1, -1, -1, -1, -1, 0, -1, 1, 2, 3, 4, 5, 6, 5, 6, 7, -1, -1, -1 }, |
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129 | /* Long */ { -1, -1, -1, -1, -1, -1, -1, -1, 0, 1, 2, 3, 4, 5, 6, 5, 6, 7, -1, -1, -1 }, |
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130 | /* ULong */ { -1, -1, -1, -1, -1, -1, -1, -1, -1, 0, 1, 2, 3, 4, 5, 4, 5, 6, -1, -1, -1 }, |
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131 | /* LLong */ { -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, 0, 1, 2, 3, 4, 3, 4, 5, -1, -1, -1 }, |
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132 | /* ULLong */ { -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, 0, 1, 2, 3, 2, 3, 4, -1, -1, -1 }, |
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133 | /* Float */ { -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, 0, 1, 2, 1, 2, 3, -1, -1, -1 }, |
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134 | /* Double */ { -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, 0, 1, -1, 1, 2, -1, -1, -1 }, |
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135 | /* LDbl */ { -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, 0, -1, -1, 1, -1, -1, -1 }, |
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136 | /* FCplex */ { -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, 0, 1, 2, -1, -1, -1 }, |
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137 | /* DCplex */ { -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, 0, 1, -1, -1, -1 }, |
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138 | /* LDCplex */ { -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, 0, -1, -1, -1 }, |
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139 | /* FImag */ { -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, 1, 2, 3, 0, 1, 2 }, |
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140 | /* DImag */ { -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, 1, 2, -1, 0, 1 }, |
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141 | /* LDImag */ { -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, 1, -1, -1, 0 } |
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142 | }; |
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143 | |
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144 | void |
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145 | ConversionCost::visit(VoidType *voidType) |
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146 | { |
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147 | cost = Cost::infinity; |
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148 | } |
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149 | |
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150 | void |
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151 | ConversionCost::visit(BasicType *basicType) |
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152 | { |
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153 | if( BasicType *destAsBasic = dynamic_cast< BasicType* >( dest ) ) { |
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154 | int tableResult = costMatrix[ basicType->get_kind() ][ destAsBasic->get_kind() ]; |
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155 | if( tableResult == -1 ) { |
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156 | cost = Cost( 1, 0, 0 ); |
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157 | } else { |
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158 | cost = Cost( 0, 0, tableResult ); |
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159 | } |
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160 | } |
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161 | } |
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162 | |
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163 | void |
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164 | ConversionCost::visit(PointerType *pointerType) |
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165 | { |
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166 | if( PointerType *destAsPtr = dynamic_cast< PointerType* >( dest ) ) { |
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167 | if( pointerType->get_base()->get_qualifiers() <= destAsPtr->get_base()->get_qualifiers() && typesCompatibleIgnoreQualifiers( pointerType->get_base(), destAsPtr->get_base(), indexer, env ) ) { |
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168 | cost = Cost( 0, 0, 1 ); |
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169 | } else { |
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170 | int assignResult = ptrsAssignable( pointerType->get_base(), destAsPtr->get_base(), env ); |
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171 | if( assignResult < 0 ) { |
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172 | cost = Cost( 0, 0, 1 ); |
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173 | } else if( assignResult > 0 ) { |
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174 | cost = Cost( 1, 0, 0 ); |
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175 | } |
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176 | } |
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177 | } |
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178 | } |
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179 | |
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180 | void |
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181 | ConversionCost::visit(ArrayType *arrayType) |
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182 | { |
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183 | } |
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184 | |
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185 | void |
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186 | ConversionCost::visit(FunctionType *functionType) |
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187 | { |
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188 | } |
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189 | |
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190 | void |
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191 | ConversionCost::visit(StructInstType *inst) |
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192 | { |
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193 | if( StructInstType *destAsInst = dynamic_cast< StructInstType* >( dest ) ) { |
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194 | if( inst->get_name() == destAsInst->get_name() ) { |
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195 | cost = Cost::zero; |
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196 | } |
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197 | } |
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198 | } |
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199 | |
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200 | void |
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201 | ConversionCost::visit(UnionInstType *inst) |
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202 | { |
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203 | if( StructInstType *destAsInst = dynamic_cast< StructInstType* >( dest ) ) { |
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204 | if( inst->get_name() == destAsInst->get_name() ) { |
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205 | cost = Cost::zero; |
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206 | } |
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207 | } |
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208 | } |
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209 | |
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210 | void |
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211 | ConversionCost::visit(EnumInstType *inst) |
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212 | { |
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213 | static Type::Qualifiers q; |
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214 | static BasicType integer( q, BasicType::SignedInt ); |
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215 | integer.accept( *this ); |
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216 | if( cost < Cost( 1, 0, 0 ) ) { |
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217 | cost.incSafe(); |
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218 | } |
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219 | } |
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220 | |
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221 | void |
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222 | ConversionCost::visit(ContextInstType *inst) |
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223 | { |
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224 | } |
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225 | |
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226 | void |
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227 | ConversionCost::visit(TypeInstType *inst) |
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228 | { |
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229 | EqvClass eqvClass; |
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230 | NamedTypeDecl *namedType; |
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231 | if( env.lookup( inst->get_name(), eqvClass ) ) { |
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232 | cost = conversionCost( eqvClass.type, dest, indexer, env ); |
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233 | } else if( TypeInstType *destAsInst = dynamic_cast< TypeInstType* >( dest ) ) { |
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234 | if( inst->get_name() == destAsInst->get_name() ) { |
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235 | cost = Cost::zero; |
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236 | } |
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237 | } else if( ( namedType = indexer.lookupType( inst->get_name() ) ) ) { |
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238 | TypeDecl *type = dynamic_cast< TypeDecl* >( namedType ); |
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239 | // all typedefs should be gone by this point |
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240 | assert( type ); |
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241 | if( type->get_base() ) { |
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242 | cost = conversionCost( type->get_base(), dest, indexer, env ) + Cost( 0, 0, 1 ); |
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243 | } |
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244 | } |
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245 | } |
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246 | |
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247 | void |
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248 | ConversionCost::visit(TupleType *tupleType) |
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249 | { |
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250 | Cost c; |
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251 | if( TupleType *destAsTuple = dynamic_cast< TupleType* >( dest ) ) { |
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252 | std::list< Type* >::const_iterator srcIt = tupleType->get_types().begin(); |
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253 | std::list< Type* >::const_iterator destIt = destAsTuple->get_types().begin(); |
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254 | while( srcIt != tupleType->get_types().end() ) { |
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255 | Cost newCost = conversionCost( *srcIt++, *destIt++, indexer, env ); |
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256 | if( newCost == Cost::infinity ) { |
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257 | return; |
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258 | } |
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259 | c += newCost; |
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260 | } |
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261 | if( destIt != destAsTuple->get_types().end() ) { |
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262 | cost = Cost::infinity; |
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263 | } else { |
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264 | cost = c; |
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265 | } |
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266 | } |
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267 | } |
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268 | |
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269 | } // namespace ResolvExpr |
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