| 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: CastCost.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 "typeops.h"
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| 9 | #include "Cost.h"
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| 10 | #include "ConversionCost.h"
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| 11 | #include "SynTree/Type.h"
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| 12 | #include "SynTree/Visitor.h"
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| 13 | #include "SymTab/Indexer.h"
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| 14 |
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| 15 |
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| 16 | namespace ResolvExpr {
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| 17 |
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| 18 | class CastCost : public ConversionCost
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| 19 | {
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| 20 | public:
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| 21 | CastCost( Type *dest, const SymTab::Indexer &indexer, const TypeEnvironment &env );
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| 22 |
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| 23 | virtual void visit(BasicType *basicType);
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| 24 | virtual void visit(PointerType *pointerType);
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| 25 | };
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| 26 |
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| 27 | Cost
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| 28 | castCost( Type *src, Type *dest, const SymTab::Indexer &indexer, const TypeEnvironment &env )
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| 29 | {
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| 30 | // std::cout << "casting" << std::endl;
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| 31 | // src->print( std::cout, 8 );
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| 32 | // std::cout << std::endl << "to" << std::endl;
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| 33 | // dest->print( std::cout, 8 );
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| 34 | if( TypeInstType *destAsTypeInst = dynamic_cast< TypeInstType* >( dest ) ) {
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| 35 | EqvClass eqvClass;
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| 36 | NamedTypeDecl *namedType;
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| 37 | if( env.lookup( destAsTypeInst->get_name(), eqvClass ) ) {
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| 38 | return castCost( src, eqvClass.type, indexer, env );
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| 39 | } else if( ( namedType = indexer.lookupType( destAsTypeInst->get_name() ) ) ) {
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| 40 | TypeDecl *type = dynamic_cast< TypeDecl* >( namedType );
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| 41 | // all typedefs should be gone by this point
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| 42 | assert( type );
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| 43 | if( type->get_base() ) {
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| 44 | return castCost( src, type->get_base(), indexer, env ) + Cost( 0, 0, 1 );
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| 45 | }
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| 46 | }
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| 47 | }
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| 48 | if( typesCompatibleIgnoreQualifiers( src, dest, indexer, env ) ) {
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| 49 | // std::cout << "types are compatible" << std::endl;
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| 50 | return Cost( 0, 0, 0 );
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| 51 | } else if( dynamic_cast< VoidType* >( dest ) ) {
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| 52 | // std::cout << "destination is void" << std::endl;
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| 53 | return Cost( 0, 0, 1 );
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| 54 | } else {
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| 55 | CastCost converter( dest, indexer, env );
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| 56 | src->accept( converter );
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| 57 | // std::cout << "cost is " << converter.get_cost() << std::endl;
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| 58 | if( converter.get_cost() == Cost::infinity ) {
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| 59 | return Cost::infinity;
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| 60 | } else {
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| 61 | return converter.get_cost() + Cost( 0, 0, 0 );
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| 62 | }
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| 63 | }
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| 64 | }
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| 65 |
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| 66 | CastCost::CastCost( Type *dest, const SymTab::Indexer &indexer, const TypeEnvironment &env )
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| 67 | : ConversionCost( dest, indexer, env )
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| 68 | {
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| 69 | }
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| 70 |
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| 71 | void
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| 72 | CastCost::visit(BasicType *basicType)
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| 73 | {
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| 74 | if( dynamic_cast< PointerType* >( dest ) ) {
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| 75 | cost = Cost( 1, 0, 0 );
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| 76 | } else {
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| 77 | ConversionCost::visit( basicType );
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| 78 | }
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| 79 | }
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| 80 |
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| 81 | void
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| 82 | CastCost::visit(PointerType *pointerType)
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| 83 | {
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| 84 | if( PointerType *destAsPtr = dynamic_cast< PointerType* >( dest ) ) {
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| 85 | if( pointerType->get_qualifiers() <= destAsPtr->get_qualifiers() && typesCompatibleIgnoreQualifiers( pointerType->get_base(), destAsPtr->get_base(), indexer, env ) ) {
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| 86 | cost = Cost( 0, 0, 1 );
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| 87 | } else if( BasicType *destAsBasic = dynamic_cast< BasicType* >( dest ) ) {
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| 88 | if( destAsBasic->isInteger() ) {
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| 89 | cost = Cost( 1, 0, 0 );
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| 90 | }
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| 91 | } else {
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| 92 | TypeEnvironment newEnv( env );
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| 93 | newEnv.add( pointerType->get_forall() );
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| 94 | newEnv.add( pointerType->get_base()->get_forall() );
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| 95 | int assignResult = ptrsCastable( pointerType->get_base(), destAsPtr->get_base(), newEnv, indexer );
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| 96 | if( assignResult > 0 ) {
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| 97 | cost = Cost( 0, 0, 1 );
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| 98 | } else if( assignResult < 0 ) {
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| 99 | cost = Cost( 1, 0, 0 );
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| 100 | }
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| 101 | }
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| 102 | }
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| 103 | }
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| 104 |
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| 105 | } // namespace ResolvExpr
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