[a32b204] | 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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[0b150ec] | 7 | // CastCost.cc -- |
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[a32b204] | 8 | // |
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| 9 | // Author : Richard C. Bilson |
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| 10 | // Created On : Sun May 17 06:57:43 2015 |
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[52f85e0] | 11 | // Last Modified By : Peter A. Buhr |
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| 12 | // Last Modified On : Tue Feb 2 15:34:36 2016 |
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| 13 | // Update Count : 7 |
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[a32b204] | 14 | // |
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| 15 | |
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[ea6332d] | 16 | #include <cassert> // for assert |
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| 17 | |
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[3c89751] | 18 | #include "AST/Print.hpp" |
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| 19 | #include "AST/SymbolTable.hpp" |
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| 20 | #include "AST/Type.hpp" |
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| 21 | #include "AST/TypeEnvironment.hpp" |
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[ea6332d] | 22 | #include "ConversionCost.h" // for ConversionCost |
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| 23 | #include "Cost.h" // for Cost, Cost::infinity |
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| 24 | #include "ResolvExpr/TypeEnvironment.h" // for TypeEnvironment, EqvClass |
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| 25 | #include "SymTab/Indexer.h" // for Indexer |
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| 26 | #include "SynTree/Declaration.h" // for TypeDecl, NamedTypeDecl |
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| 27 | #include "SynTree/Type.h" // for PointerType, Type, TypeInstType |
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| 28 | #include "typeops.h" // for typesCompatibleIgnoreQualifiers |
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[51b7345] | 29 | |
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[150ec33] | 30 | #if 0 |
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| 31 | #define PRINT(x) x |
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| 32 | #else |
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| 33 | #define PRINT(x) |
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| 34 | #endif |
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[51b7345] | 35 | |
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| 36 | namespace ResolvExpr { |
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[3c89751] | 37 | struct CastCost_old : public ConversionCost { |
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[a32b204] | 38 | public: |
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[3c89751] | 39 | CastCost_old( Type *dest, const SymTab::Indexer &indexer, const TypeEnvironment &env, CostFunction costFunc ); |
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[0b150ec] | 40 | |
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[bd0b6b62] | 41 | using ConversionCost::previsit; |
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| 42 | using ConversionCost::postvisit; |
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| 43 | void postvisit( BasicType * basicType ); |
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| 44 | void postvisit( PointerType * pointerType ); |
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[a32b204] | 45 | }; |
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[51b7345] | 46 | |
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[a32b204] | 47 | Cost castCost( Type *src, Type *dest, const SymTab::Indexer &indexer, const TypeEnvironment &env ) { |
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| 48 | if ( TypeInstType *destAsTypeInst = dynamic_cast< TypeInstType* >( dest ) ) { |
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[00ac42e] | 49 | if ( const EqvClass* eqvClass = env.lookup( destAsTypeInst->get_name() ) ) { |
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| 50 | if ( eqvClass->type ) { |
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| 51 | return castCost( src, eqvClass->type, indexer, env ); |
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[0b150ec] | 52 | } else { |
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| 53 | return Cost::infinity; |
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| 54 | } |
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[00ac42e] | 55 | } else if ( NamedTypeDecl *namedType = indexer.lookupType( destAsTypeInst->get_name() ) ) { |
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[a32b204] | 56 | // all typedefs should be gone by this point |
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[982832e] | 57 | TypeDecl *type = strict_dynamic_cast< TypeDecl* >( namedType ); |
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[eb0aedb] | 58 | if ( type->base ) { |
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| 59 | return castCost( src, type->base, indexer, env ) + Cost::safe; |
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[a32b204] | 60 | } // if |
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| 61 | } // if |
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| 62 | } // if |
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[150ec33] | 63 | |
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| 64 | PRINT( |
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| 65 | std::cerr << "castCost ::: src is "; |
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| 66 | src->print( std::cerr ); |
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| 67 | std::cerr << std::endl << "dest is "; |
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| 68 | dest->print( std::cerr ); |
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| 69 | std::cerr << std::endl << "env is" << std::endl; |
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| 70 | env.print( std::cerr, 8 ); |
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| 71 | ) |
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| 72 | |
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[a32b204] | 73 | if ( typesCompatibleIgnoreQualifiers( src, dest, indexer, env ) ) { |
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[150ec33] | 74 | PRINT( std::cerr << "compatible!" << std::endl; ) |
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[89be1c68] | 75 | return Cost::zero; |
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[a32b204] | 76 | } else if ( dynamic_cast< VoidType* >( dest ) ) { |
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[89be1c68] | 77 | return Cost::safe; |
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[2463d0e] | 78 | } else if ( ReferenceType * refType = dynamic_cast< ReferenceType * > ( dest ) ) { |
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[150ec33] | 79 | PRINT( std::cerr << "conversionCost: dest is reference" << std::endl; ) |
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[721cd19f] | 80 | return convertToReferenceCost( src, refType, indexer, env, [](Type * t1, Type * t2, const SymTab::Indexer & indexer, const TypeEnvironment & env ) { |
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[0c6596f] | 81 | return ptrsCastable( t1, t2, env, indexer ); |
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| 82 | }); |
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[a32b204] | 83 | } else { |
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[3c89751] | 84 | PassVisitor<CastCost_old> converter( |
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[c8e4d2f8] | 85 | dest, indexer, env, |
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| 86 | (Cost (*)( Type *, Type *, const SymTab::Indexer &, const TypeEnvironment & )) |
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| 87 | castCost ); |
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[a32b204] | 88 | src->accept( converter ); |
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[bd0b6b62] | 89 | if ( converter.pass.get_cost() == Cost::infinity ) { |
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[a32b204] | 90 | return Cost::infinity; |
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| 91 | } else { |
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[1521de20] | 92 | // xxx - why are we adding cost 0 here? |
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[bd0b6b62] | 93 | return converter.pass.get_cost() + Cost::zero; |
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[a32b204] | 94 | } // if |
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[c11e31c] | 95 | } // if |
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[a32b204] | 96 | } |
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[51b7345] | 97 | |
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[3c89751] | 98 | CastCost_old::CastCost_old( Type *dest, const SymTab::Indexer &indexer, const TypeEnvironment &env, CostFunction costFunc ) |
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[721cd19f] | 99 | : ConversionCost( dest, indexer, env, costFunc ) { |
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[a32b204] | 100 | } |
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[51b7345] | 101 | |
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[3c89751] | 102 | void CastCost_old::postvisit( BasicType *basicType ) { |
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[543159b] | 103 | PointerType *destAsPointer = dynamic_cast< PointerType* >( dest ); |
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| 104 | if ( destAsPointer && basicType->isInteger() ) { |
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[9fd97126] | 105 | // necessary for, e.g. unsigned long => void* |
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[89be1c68] | 106 | cost = Cost::unsafe; |
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[a32b204] | 107 | } else { |
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[2463d0e] | 108 | cost = conversionCost( basicType, dest, indexer, env ); |
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[a32b204] | 109 | } // if |
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| 110 | } |
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[51b7345] | 111 | |
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[3c89751] | 112 | void CastCost_old::postvisit( PointerType *pointerType ) { |
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[a32b204] | 113 | if ( PointerType *destAsPtr = dynamic_cast< PointerType* >( dest ) ) { |
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[eb0aedb] | 114 | if ( pointerType->get_qualifiers() <= destAsPtr->get_qualifiers() && typesCompatibleIgnoreQualifiers( pointerType->base, destAsPtr->base, indexer, env ) ) { |
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[89be1c68] | 115 | cost = Cost::safe; |
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[a32b204] | 116 | } else { |
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| 117 | TypeEnvironment newEnv( env ); |
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[eb0aedb] | 118 | newEnv.add( pointerType->forall ); |
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| 119 | newEnv.add( pointerType->base->forall ); |
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| 120 | int castResult = ptrsCastable( pointerType->base, destAsPtr->base, newEnv, indexer ); |
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[1521de20] | 121 | if ( castResult > 0 ) { |
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[89be1c68] | 122 | cost = Cost::safe; |
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[1521de20] | 123 | } else if ( castResult < 0 ) { |
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[52f85e0] | 124 | cost = Cost::infinity; |
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[a32b204] | 125 | } // if |
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| 126 | } // if |
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[543159b] | 127 | } else if ( BasicType *destAsBasic = dynamic_cast< BasicType* >( dest ) ) { |
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| 128 | if ( destAsBasic->isInteger() ) { |
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[9fd97126] | 129 | // necessary for, e.g. void* => unsigned long |
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[89be1c68] | 130 | cost = Cost::unsafe; |
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[543159b] | 131 | } // if |
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| 132 | } |
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[a32b204] | 133 | } |
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[c8e4d2f8] | 134 | |
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[3c89751] | 135 | namespace { |
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| 136 | struct CastCost_new : public ConversionCost_new { |
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| 137 | using ConversionCost_new::previsit; |
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| 138 | using ConversionCost_new::postvisit; |
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| 139 | |
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| 140 | CastCost_new( |
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| 141 | const ast::Type * dst, const ast::SymbolTable & symtab, |
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| 142 | const ast::TypeEnvironment & env, CostCalculation costFunc ) |
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| 143 | : ConversionCost_new( dst, symtab, env, costFunc ) {} |
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| 144 | |
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| 145 | void postvisit( const ast::BasicType * basicType ) { |
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| 146 | auto ptr = dynamic_cast< const ast::PointerType * >( dst ); |
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| 147 | if ( ptr && basicType->isInteger() ) { |
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| 148 | // needed for, e.g. unsigned long => void * |
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| 149 | cost = Cost::unsafe; |
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| 150 | } else { |
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| 151 | cost = conversionCost( basicType, dst, symtab, env ); |
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| 152 | } |
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| 153 | } |
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| 154 | |
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| 155 | void postvisit( const ast::PointerType * pointerType ) { |
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| 156 | if ( auto ptr = dynamic_cast< const ast::PointerType * >( dst ) ) { |
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| 157 | if ( |
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| 158 | pointerType->qualifiers <= ptr->qualifiers |
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| 159 | && typesCompatibleIgnoreQualifiers( pointerType->base, ptr->base, symtab, env ) |
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| 160 | ) { |
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| 161 | cost = Cost::safe; |
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| 162 | } else { |
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| 163 | ast::TypeEnvironment newEnv{ env }; |
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| 164 | if ( auto wParams = pointerType->base.as< ast::ParameterizedType >() ) { |
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| 165 | newEnv.add( wParams->forall ); |
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| 166 | } |
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| 167 | int castResult = ptrsCastable( pointerType->base, ptr->base, symtab, newEnv ); |
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| 168 | if ( castResult > 0 ) { |
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| 169 | cost = Cost::safe; |
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| 170 | } else if ( castResult < 0 ) { |
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| 171 | cost = Cost::infinity; |
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| 172 | } |
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| 173 | } |
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| 174 | } else if ( auto basic = dynamic_cast< const ast::BasicType * >( dst ) ) { |
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| 175 | if ( basic->isInteger() ) { |
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| 176 | // necessary for, e.g. void * => unsigned long |
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| 177 | cost = Cost::unsafe; |
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| 178 | } |
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| 179 | } |
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| 180 | } |
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| 181 | }; |
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| 182 | } // anonymous namespace |
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| 183 | |
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| 184 | Cost castCost( |
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| 185 | const ast::Type * src, const ast::Type * dst, const ast::SymbolTable & symtab, |
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| 186 | const ast::TypeEnvironment & env |
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| 187 | ) { |
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| 188 | if ( auto typeInst = dynamic_cast< const ast::TypeInstType * >( dst ) ) { |
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| 189 | if ( const ast::EqvClass * eqvClass = env.lookup( typeInst->name ) ) { |
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| 190 | // check cast cost against bound type, if present |
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| 191 | if ( eqvClass->bound ) { |
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| 192 | return castCost( src, eqvClass->bound, symtab, env ); |
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| 193 | } else { |
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| 194 | return Cost::infinity; |
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| 195 | } |
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| 196 | } else if ( const ast::NamedTypeDecl * named = symtab.lookupType( typeInst->name ) ) { |
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| 197 | // all typedefs should be gone by now |
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| 198 | auto type = strict_dynamic_cast< const ast::TypeDecl * >( named ); |
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| 199 | if ( type->base ) { |
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| 200 | return castCost( src, type->base, symtab, env ) + Cost::safe; |
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| 201 | } |
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| 202 | } |
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| 203 | } |
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| 204 | |
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| 205 | PRINT( |
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| 206 | std::cerr << "castCost ::: src is "; |
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| 207 | ast::print( std::cerr, src ); |
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| 208 | std::cerr << std::endl << "dest is "; |
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| 209 | ast::print( std::cerr, dst ); |
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| 210 | std::cerr << std::endl << "env is" << std::endl; |
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| 211 | ast::print( std::cerr, env, 2 ); |
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| 212 | ) |
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| 213 | |
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| 214 | if ( typesCompatibleIgnoreQualifiers( src, dst, symtab, env ) ) { |
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| 215 | PRINT( std::cerr << "compatible!" << std::endl; ) |
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[c8e4d2f8] | 216 | return Cost::zero; |
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[3c89751] | 217 | } else if ( dynamic_cast< const ast::VoidType * >( dst ) ) { |
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| 218 | return Cost::safe; |
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| 219 | } else if ( auto refType = dynamic_cast< const ast::ReferenceType * >( dst ) ) { |
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| 220 | PRINT( std::cerr << "conversionCost: dest is reference" << std::endl; ) |
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| 221 | #warning cast on ptrsCastable artifact of having two functions, remove when port done |
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| 222 | return convertToReferenceCost( |
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| 223 | src, refType, symtab, env, |
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| 224 | ( int (*)( |
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| 225 | const ast::Type *, const ast::Type *, const ast::SymbolTable &, |
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| 226 | const ast::TypeEnvironment & ) |
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| 227 | ) ptrsCastable ); |
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| 228 | } else { |
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| 229 | #warning cast on castCost artifact of having two functions, remove when port done |
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| 230 | ast::Pass< CastCost_new > converter{ |
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| 231 | dst, symtab, env, |
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| 232 | ( Cost (*)( |
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| 233 | const ast::Type *, const ast::Type *, const ast::SymbolTable &, |
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| 234 | const ast::TypeEnvironment & ) |
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| 235 | ) castCost }; |
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| 236 | src->accept( converter ); |
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| 237 | return converter.pass.cost; |
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[c8e4d2f8] | 238 | } |
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[3c89751] | 239 | } |
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| 240 | |
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[51b7345] | 241 | } // namespace ResolvExpr |
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[a32b204] | 242 | |
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| 243 | // Local Variables: // |
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| 244 | // tab-width: 4 // |
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| 245 | // mode: c++ // |
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| 246 | // compile-command: "make install" // |
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| 247 | // End: // |
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