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 | // PtrsCastable.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 11:48:00 2015 |
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11 | // Last Modified By : Peter A. Buhr |
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12 | // Last Modified On : Wed Dec 11 21:48:33 2019 |
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13 | // Update Count : 9 |
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14 | // |
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15 | |
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16 | #include "AST/Decl.hpp" |
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17 | #include "AST/Pass.hpp" |
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18 | #include "AST/Type.hpp" |
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19 | #include "AST/TypeEnvironment.hpp" |
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20 | #include "Common/PassVisitor.h" |
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21 | #include "ResolvExpr/TypeEnvironment.h" // for EqvClass, TypeEnvironment |
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22 | #include "SymTab/Indexer.h" // for Indexer |
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23 | #include "SynTree/Declaration.h" // for TypeDecl, TypeDecl::Kind::Ftype |
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24 | #include "SynTree/Type.h" // for TypeInstType, Type, BasicType |
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25 | #include "SynTree/Visitor.h" // for Visitor |
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26 | #include "typeops.h" // for ptrsAssignable |
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27 | |
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28 | namespace ResolvExpr { |
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29 | struct PtrsCastable_old : public WithShortCircuiting { |
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30 | public: |
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31 | PtrsCastable_old( const Type * dest, const TypeEnvironment &env, const SymTab::Indexer &indexer ); |
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32 | |
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33 | int get_result() const { return result; } |
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34 | |
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35 | void previsit( const Type * ) { visit_children = false; } |
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36 | |
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37 | void postvisit( const VoidType * voidType ); |
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38 | void postvisit( const BasicType * basicType ); |
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39 | void postvisit( const PointerType * pointerType ); |
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40 | void postvisit( const ArrayType * arrayType ); |
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41 | void postvisit( const FunctionType * functionType ); |
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42 | void postvisit( const StructInstType * inst ); |
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43 | void postvisit( const UnionInstType * inst ); |
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44 | void postvisit( const EnumInstType * inst ); |
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45 | void postvisit( const TraitInstType * inst ); |
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46 | void postvisit( const TypeInstType * inst ); |
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47 | void postvisit( const TupleType * tupleType ); |
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48 | void postvisit( const VarArgsType * varArgsType ); |
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49 | void postvisit( const ZeroType * zeroType ); |
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50 | void postvisit( const OneType * oneType ); |
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51 | private: |
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52 | const Type * dest; |
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53 | int result; |
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54 | const TypeEnvironment &env; |
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55 | const SymTab::Indexer &indexer; |
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56 | }; |
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57 | |
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58 | namespace { |
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59 | int objectCast( const Type * src, const TypeEnvironment &env, const SymTab::Indexer &indexer ) { |
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60 | if ( dynamic_cast< const FunctionType* >( src ) ) { |
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61 | return -1; |
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62 | } else if ( const TypeInstType * typeInst = dynamic_cast< const TypeInstType* >( src ) ) { |
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63 | if ( const NamedTypeDecl * ntDecl = indexer.lookupType( typeInst->name ) ) { |
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64 | if ( const TypeDecl * tyDecl = dynamic_cast< const TypeDecl* >( ntDecl ) ) { |
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65 | if ( tyDecl->kind == TypeDecl::Ftype ) { |
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66 | return -1; |
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67 | } // if |
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68 | } //if |
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69 | } else if ( const EqvClass * eqvClass = env.lookup( typeInst->get_name() ) ) { |
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70 | if ( eqvClass->data.kind == TypeDecl::Ftype ) { |
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71 | return -1; |
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72 | } // if |
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73 | } // if |
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74 | } //if |
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75 | return 1; |
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76 | } |
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77 | int functionCast( const Type * src, const TypeEnvironment &env, const SymTab::Indexer &indexer ) { |
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78 | return -1 * objectCast( src, env, indexer ); // reverse the sense of objectCast |
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79 | } |
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80 | } |
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81 | |
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82 | int ptrsCastable( const Type * src, const Type * dest, const TypeEnvironment &env, const SymTab::Indexer &indexer ) { |
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83 | if ( const TypeInstType * destAsTypeInst = dynamic_cast< const TypeInstType* >( dest ) ) { |
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84 | if ( const EqvClass * eqvClass = env.lookup( destAsTypeInst->get_name() ) ) { |
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85 | // xxx - should this be ptrsCastable? |
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86 | return ptrsAssignable( src, eqvClass->type, env ); |
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87 | } // if |
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88 | } // if |
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89 | if ( dynamic_cast< const VoidType* >( dest ) ) { |
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90 | return objectCast( src, env, indexer ); |
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91 | } else { |
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92 | PassVisitor<PtrsCastable_old> ptrs( dest, env, indexer ); |
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93 | src->accept( ptrs ); |
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94 | return ptrs.pass.get_result(); |
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95 | } // if |
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96 | } |
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97 | |
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98 | PtrsCastable_old::PtrsCastable_old( const Type * dest, const TypeEnvironment &env, const SymTab::Indexer &indexer ) |
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99 | : dest( dest ), result( 0 ), env( env ), indexer( indexer ) { |
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100 | } |
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101 | |
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102 | void PtrsCastable_old::postvisit( const VoidType * ) { |
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103 | result = objectCast( dest, env, indexer ); |
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104 | } |
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105 | |
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106 | void PtrsCastable_old::postvisit( const BasicType * ) { |
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107 | result = objectCast( dest, env, indexer ); |
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108 | } |
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109 | |
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110 | void PtrsCastable_old::postvisit( const PointerType * ) { |
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111 | result = objectCast( dest, env, indexer ); |
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112 | } |
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113 | |
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114 | void PtrsCastable_old::postvisit( const ArrayType * ) { |
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115 | result = objectCast( dest, env, indexer ); |
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116 | } |
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117 | |
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118 | void PtrsCastable_old::postvisit( const FunctionType * ) { |
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119 | // result = -1; |
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120 | result = functionCast( dest, env, indexer ); |
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121 | } |
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122 | |
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123 | void PtrsCastable_old::postvisit( const StructInstType * ) { |
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124 | result = objectCast( dest, env, indexer ); |
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125 | } |
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126 | |
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127 | void PtrsCastable_old::postvisit( const UnionInstType * ) { |
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128 | result = objectCast( dest, env, indexer ); |
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129 | } |
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130 | |
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131 | void PtrsCastable_old::postvisit( const EnumInstType * ) { |
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132 | if ( dynamic_cast< const EnumInstType * >( dest ) ) { |
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133 | result = 1; |
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134 | } else if ( const BasicType * bt = dynamic_cast< const BasicType * >( dest ) ) { |
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135 | if ( bt->kind == BasicType::SignedInt ) { |
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136 | result = 0; |
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137 | } else { |
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138 | result = 1; |
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139 | } |
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140 | } else { |
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141 | result = objectCast( dest, env, indexer ); |
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142 | } |
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143 | } |
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144 | |
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145 | void PtrsCastable_old::postvisit( const TraitInstType * ) {} |
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146 | |
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147 | void PtrsCastable_old::postvisit( const TypeInstType *inst ) { |
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148 | //result = objectCast( inst, env, indexer ) > 0 && objectCast( dest, env, indexer ) > 0 ? 1 : -1; |
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149 | result = objectCast( inst, env, indexer ) == objectCast( dest, env, indexer ) ? 1 : -1; |
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150 | } |
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151 | |
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152 | void PtrsCastable_old::postvisit( const TupleType * ) { |
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153 | result = objectCast( dest, env, indexer ); |
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154 | } |
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155 | |
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156 | void PtrsCastable_old::postvisit( const VarArgsType * ) { |
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157 | result = objectCast( dest, env, indexer ); |
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158 | } |
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159 | |
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160 | void PtrsCastable_old::postvisit( const ZeroType * ) { |
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161 | result = objectCast( dest, env, indexer ); |
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162 | } |
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163 | |
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164 | void PtrsCastable_old::postvisit( const OneType * ) { |
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165 | result = objectCast( dest, env, indexer ); |
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166 | } |
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167 | |
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168 | namespace { |
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169 | // can this type be cast to an object (1 for yes, -1 for no) |
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170 | int objectCast( |
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171 | const ast::Type * src, const ast::TypeEnvironment & env, const ast::SymbolTable & symtab |
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172 | ) { |
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173 | if ( dynamic_cast< const ast::FunctionType * >( src ) ) { |
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174 | return -1; |
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175 | } else if ( auto inst = dynamic_cast< const ast::TypeInstType * >( src ) ) { |
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176 | if ( const ast::NamedTypeDecl * named = symtab.lookupType( inst->name ) ) { |
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177 | if ( auto tyDecl = dynamic_cast< const ast::TypeDecl * >( named ) ) { |
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178 | if ( tyDecl->kind == ast::TypeDecl::Ftype ) { |
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179 | return -1; |
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180 | } |
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181 | } |
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182 | } else if ( const ast::EqvClass * eqvClass = env.lookup( inst->name ) ) { |
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183 | if ( eqvClass->data.kind == ast::TypeDecl::Ftype ) { |
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184 | return -1; |
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185 | } |
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186 | } |
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187 | } |
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188 | |
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189 | return 1; |
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190 | } |
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191 | |
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192 | // can this type be cast to a function (inverse of objectCast) |
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193 | int functionCast( |
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194 | const ast::Type * src, const ast::TypeEnvironment & env, const ast::SymbolTable & symtab |
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195 | ) { |
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196 | return -1 * objectCast( src, env, symtab ); |
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197 | } |
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198 | |
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199 | class PtrsCastable_new : public ast::WithShortCircuiting { |
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200 | const ast::Type * dst; |
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201 | const ast::TypeEnvironment & env; |
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202 | const ast::SymbolTable & symtab; |
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203 | public: |
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204 | int result; |
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205 | |
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206 | PtrsCastable_new( |
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207 | const ast::Type * d, const ast::TypeEnvironment & e, const ast::SymbolTable & syms ) |
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208 | : dst( d ), env( e ), symtab( syms ), result( 0 ) {} |
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209 | |
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210 | void previsit( const ast::Type * ) { visit_children = false; } |
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211 | |
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212 | void postvisit( const ast::VoidType * ) { |
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213 | result = objectCast( dst, env, symtab ); |
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214 | } |
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215 | |
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216 | void postvisit( const ast::BasicType * ) { |
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217 | result = objectCast( dst, env, symtab ); |
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218 | } |
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219 | |
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220 | void postvisit( const ast::PointerType * ) { |
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221 | result = objectCast( dst, env, symtab ); |
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222 | } |
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223 | |
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224 | void postvisit( const ast::ArrayType * ) { |
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225 | result = objectCast( dst, env, symtab ); |
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226 | } |
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227 | |
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228 | void postvisit( const ast::FunctionType * ) { |
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229 | result = functionCast( dst, env, symtab ); |
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230 | } |
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231 | |
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232 | void postvisit( const ast::StructInstType * ) { |
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233 | result = objectCast( dst, env, symtab ); |
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234 | } |
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235 | |
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236 | void postvisit( const ast::UnionInstType * ) { |
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237 | result = objectCast( dst, env, symtab ); |
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238 | } |
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239 | |
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240 | void postvisit( const ast::EnumInstType * ) { |
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241 | if ( dynamic_cast< const ast::EnumInstType * >( dst ) ) { |
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242 | result = 1; |
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243 | } else if ( auto bt = dynamic_cast< const ast::BasicType * >( dst ) ) { |
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244 | if ( bt->kind == ast::BasicType::SignedInt ) { |
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245 | result = 0; |
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246 | } else { |
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247 | result = 1; |
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248 | } |
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249 | } else { |
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250 | result = objectCast( dst, env, symtab ); |
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251 | } |
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252 | } |
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253 | |
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254 | void postvisit( const ast::TraitInstType * ) {} |
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255 | |
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256 | void postvisit( const ast::TypeInstType * inst ) { |
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257 | // check trait and destination type are both object or both function |
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258 | result = objectCast( inst, env, symtab ) == objectCast( dst, env, symtab ) ? 1 : -1; |
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259 | } |
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260 | |
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261 | void postvisit( const ast::TupleType * ) { |
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262 | result = objectCast( dst, env, symtab ); |
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263 | } |
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264 | |
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265 | void postvisit( const ast::VarArgsType * ) { |
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266 | result = objectCast( dst, env, symtab ); |
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267 | } |
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268 | |
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269 | void postvisit( const ast::ZeroType * ) { |
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270 | result = objectCast( dst, env, symtab ); |
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271 | } |
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272 | |
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273 | void postvisit( const ast::OneType * ) { |
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274 | result = objectCast( dst, env, symtab ); |
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275 | } |
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276 | |
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277 | }; |
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278 | } // anonymous namespace |
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279 | |
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280 | int ptrsCastable( |
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281 | const ast::Type * src, const ast::Type * dst, const ast::SymbolTable & symtab, |
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282 | const ast::TypeEnvironment & env |
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283 | ) { |
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284 | if ( auto inst = dynamic_cast< const ast::TypeInstType * >( dst ) ) { |
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285 | if ( const ast::EqvClass * eqvClass = env.lookup( inst->name ) ) { |
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286 | return ptrsAssignable( src, eqvClass->bound, env ); |
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287 | } |
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288 | } |
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289 | |
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290 | if ( dynamic_cast< const ast::VoidType * >( dst ) ) { |
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291 | return objectCast( src, env, symtab ); |
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292 | } else { |
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293 | ast::Pass< PtrsCastable_new > ptrs{ dst, env, symtab }; |
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294 | src->accept( ptrs ); |
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295 | return ptrs.pass.result; |
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296 | } |
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297 | } |
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298 | |
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299 | } // namespace ResolvExpr |
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300 | |
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301 | // Local Variables: // |
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302 | // tab-width: 4 // |
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303 | // mode: c++ // |
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304 | // compile-command: "make install" // |
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305 | // End: // |
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