1 | #include "typeops.h" |
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2 | #include "Cost.h" |
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3 | #include "ConversionCost.h" |
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4 | #include "SynTree/Type.h" |
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5 | #include "SynTree/Visitor.h" |
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6 | #include "SymTab/Indexer.h" |
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7 | |
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8 | |
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9 | namespace ResolvExpr { |
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10 | class CastCost : public ConversionCost { |
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11 | public: |
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12 | CastCost( Type *dest, const SymTab::Indexer &indexer, const TypeEnvironment &env ); |
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13 | |
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14 | virtual void visit( BasicType *basicType ); |
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15 | virtual void visit( PointerType *pointerType ); |
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16 | }; |
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17 | |
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18 | Cost castCost( Type *src, Type *dest, const SymTab::Indexer &indexer, const TypeEnvironment &env ) { |
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19 | if ( TypeInstType *destAsTypeInst = dynamic_cast< TypeInstType* >( dest ) ) { |
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20 | EqvClass eqvClass; |
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21 | NamedTypeDecl *namedType; |
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22 | if ( env.lookup( destAsTypeInst->get_name(), eqvClass ) ) { |
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23 | return castCost( src, eqvClass.type, indexer, env ); |
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24 | } else if ( ( namedType = indexer.lookupType( destAsTypeInst->get_name() ) ) ) { |
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25 | TypeDecl *type = dynamic_cast< TypeDecl* >( namedType ); |
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26 | // all typedefs should be gone by this point |
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27 | assert( type ); |
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28 | if ( type->get_base() ) { |
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29 | return castCost( src, type->get_base(), indexer, env ) + Cost( 0, 0, 1 ); |
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30 | } // if |
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31 | } // if |
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32 | } // if |
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33 | if ( typesCompatibleIgnoreQualifiers( src, dest, indexer, env ) ) { |
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34 | return Cost( 0, 0, 0 ); |
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35 | } else if ( dynamic_cast< VoidType* >( dest ) ) { |
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36 | return Cost( 0, 0, 1 ); |
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37 | } else { |
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38 | CastCost converter( dest, indexer, env ); |
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39 | src->accept( converter ); |
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40 | if ( converter.get_cost() == Cost::infinity ) { |
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41 | return Cost::infinity; |
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42 | } else { |
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43 | return converter.get_cost() + Cost( 0, 0, 0 ); |
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44 | } // if |
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45 | } // if |
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46 | } |
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47 | |
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48 | CastCost::CastCost( Type *dest, const SymTab::Indexer &indexer, const TypeEnvironment &env ) |
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49 | : ConversionCost( dest, indexer, env ) { |
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50 | } |
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51 | |
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52 | void CastCost::visit( BasicType *basicType ) { |
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53 | if ( dynamic_cast< PointerType* >( dest ) ) { |
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54 | cost = Cost( 1, 0, 0 ); |
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55 | } else { |
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56 | ConversionCost::visit( basicType ); |
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57 | } // if |
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58 | } |
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59 | |
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60 | void CastCost::visit( PointerType *pointerType ) { |
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61 | if ( PointerType *destAsPtr = dynamic_cast< PointerType* >( dest ) ) { |
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62 | if ( pointerType->get_qualifiers() <= destAsPtr->get_qualifiers() && typesCompatibleIgnoreQualifiers( pointerType->get_base(), destAsPtr->get_base(), indexer, env ) ) { |
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63 | cost = Cost( 0, 0, 1 ); |
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64 | } else if ( BasicType *destAsBasic = dynamic_cast< BasicType* >( dest ) ) { |
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65 | if ( destAsBasic->isInteger() ) { |
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66 | cost = Cost( 1, 0, 0 ); |
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67 | } |
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68 | } else { |
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69 | TypeEnvironment newEnv( env ); |
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70 | newEnv.add( pointerType->get_forall() ); |
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71 | newEnv.add( pointerType->get_base()->get_forall() ); |
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72 | int assignResult = ptrsCastable( pointerType->get_base(), destAsPtr->get_base(), newEnv, indexer ); |
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73 | if ( assignResult > 0 ) { |
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74 | cost = Cost( 0, 0, 1 ); |
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75 | } else if ( assignResult < 0 ) { |
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76 | cost = Cost( 1, 0, 0 ); |
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77 | } // if |
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78 | } // if |
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79 | } // if |
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80 | } |
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81 | } // namespace ResolvExpr |
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