| 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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