[51b7345] | 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: ConversionCost.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 "ConversionCost.h" |
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| 9 | #include "typeops.h" |
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| 10 | #include "SynTree/Type.h" |
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| 11 | #include "SynTree/Visitor.h" |
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| 12 | #include "SymTab/Indexer.h" |
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| 13 | |
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| 14 | |
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| 15 | namespace ResolvExpr { |
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| 16 | |
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| 17 | const Cost Cost::zero = Cost( 0, 0, 0 ); |
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| 18 | const Cost Cost::infinity = Cost( -1, -1, -1 ); |
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| 19 | |
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| 20 | Cost |
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| 21 | conversionCost( Type *src, Type *dest, const SymTab::Indexer &indexer, const TypeEnvironment &env ) |
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| 22 | { |
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| 23 | if( TypeInstType *destAsTypeInst = dynamic_cast< TypeInstType* >( dest ) ) { |
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| 24 | EqvClass eqvClass; |
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| 25 | NamedTypeDecl *namedType; |
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| 26 | /// std::cout << "type inst " << destAsTypeInst->get_name(); |
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| 27 | if( env.lookup( destAsTypeInst->get_name(), eqvClass ) ) { |
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| 28 | return conversionCost( src, eqvClass.type, indexer, env ); |
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| 29 | } else if( ( namedType = indexer.lookupType( destAsTypeInst->get_name() ) ) ) { |
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| 30 | /// std::cout << " found" << std::endl; |
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| 31 | TypeDecl *type = dynamic_cast< TypeDecl* >( namedType ); |
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| 32 | // all typedefs should be gone by this point |
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| 33 | assert( type ); |
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| 34 | if( type->get_base() ) { |
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| 35 | return conversionCost( src, type->get_base(), indexer, env ) + Cost( 0, 0, 1 ); |
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| 36 | } |
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| 37 | } |
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| 38 | /// std::cout << " not found" << std::endl; |
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| 39 | } |
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| 40 | /// std::cout << "src is "; |
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| 41 | /// src->print( std::cout ); |
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| 42 | /// std::cout << std::endl << "dest is "; |
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| 43 | /// dest->print( std::cout ); |
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| 44 | /// std::cout << std::endl << "env is" << std::endl; |
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| 45 | /// env.print( std::cout, 8 ); |
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| 46 | if( typesCompatibleIgnoreQualifiers( src, dest, indexer, env ) ) { |
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| 47 | /// std::cout << "compatible!" << std::endl; |
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| 48 | return Cost( 0, 0, 0 ); |
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| 49 | } else if( dynamic_cast< VoidType* >( dest ) ) { |
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| 50 | return Cost( 0, 0, 1 ); |
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| 51 | } else { |
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| 52 | ConversionCost converter( dest, indexer, env ); |
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| 53 | src->accept( converter ); |
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| 54 | if( converter.get_cost() == Cost::infinity ) { |
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| 55 | return Cost::infinity; |
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| 56 | } else { |
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| 57 | return converter.get_cost() + Cost( 0, 0, 0 ); |
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| 58 | } |
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| 59 | } |
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| 60 | } |
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| 61 | |
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| 62 | ConversionCost::ConversionCost( Type *dest, const SymTab::Indexer &indexer, const TypeEnvironment &env ) |
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| 63 | : dest( dest ), indexer( indexer ), cost( Cost::infinity ), env( env ) |
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| 64 | { |
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| 65 | } |
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| 66 | |
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| 67 | /* |
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| 68 | Old |
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| 69 | === |
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| 70 | Double |
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| 71 | | |
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| 72 | Float |
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| 73 | | |
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| 74 | ULong |
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| 75 | / \ |
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| 76 | UInt Long |
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| 77 | \ / |
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| 78 | Int |
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| 79 | | |
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| 80 | Ushort |
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| 81 | | |
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| 82 | Short |
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| 83 | | |
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| 84 | Uchar |
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| 85 | / \ |
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| 86 | Schar Char |
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| 87 | |
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| 88 | New |
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| 89 | === |
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| 90 | +-----LongDoubleComplex--+ |
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| 91 | LongDouble--+ | +-LongDoubleImag |
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| 92 | | +---DoubleComplex---+ | |
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| 93 | Double------+ | +----DoubleImag |
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| 94 | | +-FloatComplex-+ | |
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| 95 | Float---------+ +-------FloatImag |
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| 96 | | |
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| 97 | ULongLong |
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| 98 | | |
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| 99 | LongLong |
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| 100 | | |
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| 101 | ULong |
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| 102 | / \ |
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| 103 | UInt Long |
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| 104 | \ / |
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| 105 | Int |
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| 106 | | |
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| 107 | Ushort |
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| 108 | | |
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| 109 | Short |
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| 110 | | |
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| 111 | Uchar |
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| 112 | / \ |
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| 113 | Schar Char |
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| 114 | \ / |
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| 115 | Bool |
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| 116 | */ |
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| 117 | |
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| 118 | static const int costMatrix[ BasicType::NUMBER_OF_BASIC_TYPES ][ BasicType::NUMBER_OF_BASIC_TYPES ] = |
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| 119 | { |
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| 120 | /* Src \ Dest: Bool Char SChar UChar Short UShort Int UInt Long ULong LLong ULLong Float Double LDbl FCplex DCplex LDCplex FImag DImag LDImag */ |
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| 121 | /* Bool */ { 0, 1, 1, 2, 3, 4, 5, 6, 6, 7, 8, 9, 10, 11, 12, 11, 12, 13, -1, -1, -1 }, |
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| 122 | /* Char */ { -1, 0, -1, 1, 2, 3, 4, 5, 5, 6, 7, 8, 9, 10, 11, 10, 11, 12, -1, -1, -1 }, |
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| 123 | /* SChar */ { -1, -1, 0, 1, 2, 3, 4, 5, 5, 6, 7, 8, 9, 10, 11, 10, 11, 12, -1, -1, -1 }, |
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| 124 | /* UChar */ { -1, -1, -1, 0, 1, 2, 3, 4, 4, 5, 6, 7, 8, 9, 10, 9, 10, 11, -1, -1, -1 }, |
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| 125 | /* Short */ { -1, -1, -1, -1, 0, 1, 2, 3, 3, 4, 5, 6, 7, 8, 9, 8, 9, 10, -1, -1, -1 }, |
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| 126 | /* UShort */ { -1, -1, -1, -1, -1, 0, 1, 2, 2, 3, 4, 5, 6, 7, 8, 7, 8, 9, -1, -1, -1 }, |
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| 127 | /* Int */ { -1, -1, -1, -1, -1, -1, 0, 1, 1, 2, 3, 4, 5, 6, 7, 6, 7, 8, -1, -1, -1 }, |
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| 128 | /* UInt */ { -1, -1, -1, -1, -1, -1, -1, 0, -1, 1, 2, 3, 4, 5, 6, 5, 6, 7, -1, -1, -1 }, |
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| 129 | /* Long */ { -1, -1, -1, -1, -1, -1, -1, -1, 0, 1, 2, 3, 4, 5, 6, 5, 6, 7, -1, -1, -1 }, |
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| 130 | /* ULong */ { -1, -1, -1, -1, -1, -1, -1, -1, -1, 0, 1, 2, 3, 4, 5, 4, 5, 6, -1, -1, -1 }, |
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| 131 | /* LLong */ { -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, 0, 1, 2, 3, 4, 3, 4, 5, -1, -1, -1 }, |
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| 132 | /* ULLong */ { -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, 0, 1, 2, 3, 2, 3, 4, -1, -1, -1 }, |
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| 133 | /* Float */ { -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, 0, 1, 2, 1, 2, 3, -1, -1, -1 }, |
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| 134 | /* Double */ { -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, 0, 1, -1, 1, 2, -1, -1, -1 }, |
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| 135 | /* LDbl */ { -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, 0, -1, -1, 1, -1, -1, -1 }, |
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| 136 | /* FCplex */ { -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, 0, 1, 2, -1, -1, -1 }, |
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| 137 | /* DCplex */ { -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, 0, 1, -1, -1, -1 }, |
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| 138 | /* LDCplex */ { -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, 0, -1, -1, -1 }, |
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| 139 | /* FImag */ { -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, 1, 2, 3, 0, 1, 2 }, |
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| 140 | /* DImag */ { -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, 1, 2, -1, 0, 1 }, |
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| 141 | /* LDImag */ { -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, 1, -1, -1, 0 } |
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| 142 | }; |
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| 143 | |
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| 144 | void |
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| 145 | ConversionCost::visit(VoidType *voidType) |
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| 146 | { |
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| 147 | cost = Cost::infinity; |
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| 148 | } |
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| 149 | |
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| 150 | void |
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| 151 | ConversionCost::visit(BasicType *basicType) |
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| 152 | { |
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| 153 | if( BasicType *destAsBasic = dynamic_cast< BasicType* >( dest ) ) { |
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| 154 | int tableResult = costMatrix[ basicType->get_kind() ][ destAsBasic->get_kind() ]; |
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| 155 | if( tableResult == -1 ) { |
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| 156 | cost = Cost( 1, 0, 0 ); |
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| 157 | } else { |
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| 158 | cost = Cost( 0, 0, tableResult ); |
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| 159 | } |
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| 160 | } |
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| 161 | } |
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| 162 | |
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| 163 | void |
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| 164 | ConversionCost::visit(PointerType *pointerType) |
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| 165 | { |
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| 166 | if( PointerType *destAsPtr = dynamic_cast< PointerType* >( dest ) ) { |
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| 167 | if( pointerType->get_base()->get_qualifiers() <= destAsPtr->get_base()->get_qualifiers() && typesCompatibleIgnoreQualifiers( pointerType->get_base(), destAsPtr->get_base(), indexer, env ) ) { |
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| 168 | cost = Cost( 0, 0, 1 ); |
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| 169 | } else { |
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| 170 | int assignResult = ptrsAssignable( pointerType->get_base(), destAsPtr->get_base(), env ); |
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| 171 | if( assignResult < 0 ) { |
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| 172 | cost = Cost( 0, 0, 1 ); |
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| 173 | } else if( assignResult > 0 ) { |
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| 174 | cost = Cost( 1, 0, 0 ); |
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| 175 | } |
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| 176 | } |
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| 177 | } |
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| 178 | } |
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| 179 | |
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| 180 | void |
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| 181 | ConversionCost::visit(ArrayType *arrayType) |
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| 182 | { |
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| 183 | } |
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| 184 | |
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| 185 | void |
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| 186 | ConversionCost::visit(FunctionType *functionType) |
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| 187 | { |
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| 188 | } |
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| 189 | |
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| 190 | void |
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| 191 | ConversionCost::visit(StructInstType *inst) |
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| 192 | { |
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| 193 | if( StructInstType *destAsInst = dynamic_cast< StructInstType* >( dest ) ) { |
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| 194 | if( inst->get_name() == destAsInst->get_name() ) { |
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| 195 | cost = Cost::zero; |
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| 196 | } |
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| 197 | } |
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| 198 | } |
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| 199 | |
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| 200 | void |
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| 201 | ConversionCost::visit(UnionInstType *inst) |
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| 202 | { |
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| 203 | if( StructInstType *destAsInst = dynamic_cast< StructInstType* >( dest ) ) { |
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| 204 | if( inst->get_name() == destAsInst->get_name() ) { |
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| 205 | cost = Cost::zero; |
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| 206 | } |
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| 207 | } |
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| 208 | } |
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| 209 | |
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| 210 | void |
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| 211 | ConversionCost::visit(EnumInstType *inst) |
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| 212 | { |
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| 213 | static Type::Qualifiers q; |
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| 214 | static BasicType integer( q, BasicType::SignedInt ); |
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| 215 | integer.accept( *this ); |
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| 216 | if( cost < Cost( 1, 0, 0 ) ) { |
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| 217 | cost.incSafe(); |
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| 218 | } |
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| 219 | } |
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| 220 | |
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| 221 | void |
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| 222 | ConversionCost::visit(ContextInstType *inst) |
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| 223 | { |
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| 224 | } |
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| 225 | |
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| 226 | void |
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| 227 | ConversionCost::visit(TypeInstType *inst) |
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| 228 | { |
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| 229 | EqvClass eqvClass; |
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| 230 | NamedTypeDecl *namedType; |
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| 231 | if( env.lookup( inst->get_name(), eqvClass ) ) { |
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| 232 | cost = conversionCost( eqvClass.type, dest, indexer, env ); |
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| 233 | } else if( TypeInstType *destAsInst = dynamic_cast< TypeInstType* >( dest ) ) { |
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| 234 | if( inst->get_name() == destAsInst->get_name() ) { |
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| 235 | cost = Cost::zero; |
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| 236 | } |
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| 237 | } else if( ( namedType = indexer.lookupType( inst->get_name() ) ) ) { |
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| 238 | TypeDecl *type = dynamic_cast< TypeDecl* >( namedType ); |
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| 239 | // all typedefs should be gone by this point |
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| 240 | assert( type ); |
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| 241 | if( type->get_base() ) { |
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| 242 | cost = conversionCost( type->get_base(), dest, indexer, env ) + Cost( 0, 0, 1 ); |
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| 243 | } |
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| 244 | } |
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| 245 | } |
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| 246 | |
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| 247 | void |
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| 248 | ConversionCost::visit(TupleType *tupleType) |
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| 249 | { |
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| 250 | Cost c; |
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| 251 | if( TupleType *destAsTuple = dynamic_cast< TupleType* >( dest ) ) { |
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| 252 | std::list< Type* >::const_iterator srcIt = tupleType->get_types().begin(); |
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| 253 | std::list< Type* >::const_iterator destIt = destAsTuple->get_types().begin(); |
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| 254 | while( srcIt != tupleType->get_types().end() ) { |
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| 255 | Cost newCost = conversionCost( *srcIt++, *destIt++, indexer, env ); |
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| 256 | if( newCost == Cost::infinity ) { |
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| 257 | return; |
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| 258 | } |
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| 259 | c += newCost; |
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| 260 | } |
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| 261 | if( destIt != destAsTuple->get_types().end() ) { |
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| 262 | cost = Cost::infinity; |
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| 263 | } else { |
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| 264 | cost = c; |
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| 265 | } |
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| 266 | } |
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| 267 | } |
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| 268 | |
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| 269 | } // namespace ResolvExpr |
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