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 | // PtrsAssignable.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 11:44:11 2015 |
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11 | // Last Modified By : Rob Schluntz |
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12 | // Last Modified On : Mon Sep 21 14:34:58 2015 |
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13 | // Update Count : 7 |
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14 | // |
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15 | |
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16 | #include "typeops.h" |
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17 | #include "SynTree/Type.h" |
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18 | #include "SynTree/Declaration.h" |
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19 | #include "SynTree/Visitor.h" |
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20 | |
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21 | |
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22 | namespace ResolvExpr { |
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23 | class PtrsAssignable : public Visitor { |
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24 | public: |
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25 | PtrsAssignable( Type *dest, const TypeEnvironment &env ); |
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26 | |
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27 | int get_result() const { return result; } |
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28 | |
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29 | virtual void visit( VoidType *voidType ); |
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30 | virtual void visit( BasicType *basicType ); |
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31 | virtual void visit( PointerType *pointerType ); |
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32 | virtual void visit( ArrayType *arrayType ); |
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33 | virtual void visit( FunctionType *functionType ); |
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34 | virtual void visit( StructInstType *inst ); |
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35 | virtual void visit( UnionInstType *inst ); |
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36 | virtual void visit( EnumInstType *inst ); |
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37 | virtual void visit( ContextInstType *inst ); |
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38 | virtual void visit( TypeInstType *inst ); |
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39 | virtual void visit( TupleType *tupleType ); |
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40 | private: |
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41 | Type *dest; |
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42 | int result; |
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43 | const TypeEnvironment &env; |
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44 | }; |
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45 | |
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46 | int ptrsAssignable( Type *src, Type *dest, const TypeEnvironment &env ) { |
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47 | if ( TypeInstType *destAsTypeInst = dynamic_cast< TypeInstType* >( dest ) ) { |
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48 | EqvClass eqvClass; |
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49 | if ( env.lookup( destAsTypeInst->get_name(), eqvClass ) ) { |
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50 | return ptrsAssignable( src, eqvClass.type, env ); |
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51 | } // if |
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52 | } // if |
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53 | if ( dynamic_cast< VoidType* >( dest ) ) { |
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54 | return 1; |
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55 | } else { |
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56 | PtrsAssignable ptrs( dest, env ); |
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57 | src->accept( ptrs ); |
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58 | return ptrs.get_result(); |
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59 | } // if |
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60 | } |
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61 | |
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62 | PtrsAssignable::PtrsAssignable( Type *dest, const TypeEnvironment &env ) : dest( dest ), result( 0 ), env( env ) { |
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63 | } |
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64 | |
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65 | void PtrsAssignable::visit( VoidType *voidType ) { |
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66 | if ( dynamic_cast< FunctionType* >( dest ) ) { |
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67 | result = 0; |
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68 | } else { |
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69 | result = -1; |
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70 | } // if |
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71 | } |
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72 | |
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73 | void PtrsAssignable::visit( BasicType *basicType ) { |
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74 | } |
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75 | |
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76 | void PtrsAssignable::visit( PointerType *pointerType ) { |
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77 | } |
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78 | |
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79 | void PtrsAssignable::visit( ArrayType *arrayType ) { |
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80 | } |
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81 | |
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82 | void PtrsAssignable::visit( FunctionType *functionType ) { |
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83 | result = -1; |
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84 | } |
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85 | |
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86 | void PtrsAssignable::visit( StructInstType *inst ) { |
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87 | // I don't think we should be doing anything here, but I'm willing to admit that I might be wrong |
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88 | } |
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89 | |
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90 | void PtrsAssignable::visit( UnionInstType *inst ) { |
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91 | // I don't think we should be doing anything here, but I'm willing to admit that I might be wrong |
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92 | } |
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93 | |
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94 | void PtrsAssignable::visit( EnumInstType *inst ) { |
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95 | if ( dynamic_cast< EnumInstType* >( inst ) ) { |
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96 | result = 1; |
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97 | } else if ( BasicType *bt = dynamic_cast< BasicType* >( inst ) ) { |
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98 | result = bt->get_kind() == BasicType::SignedInt; |
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99 | } |
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100 | } |
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101 | |
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102 | void PtrsAssignable::visit( ContextInstType *inst ) { |
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103 | // I definitely don't think we should be doing anything here |
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104 | } |
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105 | |
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106 | void PtrsAssignable::visit( TypeInstType *inst ) { |
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107 | EqvClass eqvClass; |
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108 | if ( env.lookup( inst->get_name(), eqvClass ) && eqvClass.type ) { |
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109 | result = ptrsAssignable( eqvClass.type, dest, env ); |
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110 | } else { |
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111 | result = 0; |
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112 | } // if |
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113 | } |
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114 | |
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115 | void PtrsAssignable::visit( TupleType *tupleType ) { |
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116 | /// // This code doesn't belong here, but it might be useful somewhere else |
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117 | /// if ( TupleType *destAsTuple = dynamic_cast< TupleType* >( dest ) ) { |
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118 | /// int ret = 0; |
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119 | /// std::list< Type* >::const_iterator srcIt = tupleType->get_types().begin(); |
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120 | /// std::list< Type* >::const_iterator destIt = destAsTuple->get_types().begin(); |
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121 | /// while ( srcIt != tupleType->get_types().end() && destIt != destAsTuple->get_types().end() ) { |
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122 | /// int assignResult = ptrsAssignable( *srcIt++, *destIt++ ); |
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123 | /// if ( assignResult == 0 ) { |
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124 | /// result = assignResult; |
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125 | /// return; |
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126 | /// } else if ( assignResult < 0 ) { |
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127 | /// ret = -1; |
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128 | /// } else if ( ret > 0 ) { |
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129 | /// ret += assignResult; |
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130 | /// } |
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131 | /// } |
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132 | /// if ( srcIt == tupleType->get_types().end() && destIt == destAsTuple->get_types().end() ) { |
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133 | /// result = ret; |
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134 | /// } else { |
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135 | /// result = 0; |
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136 | /// } |
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137 | /// } |
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138 | } |
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139 | } // namespace ResolvExpr |
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140 | |
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141 | // Local Variables: // |
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142 | // tab-width: 4 // |
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143 | // mode: c++ // |
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144 | // compile-command: "make install" // |
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145 | // End: // |
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