| 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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| 7 | // CastCost.cc --
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| 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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| 11 | // Last Modified By : Andrew Beach
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| 12 | // Last Modified On : Tue Oct 4 15:00:00 2019
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| 13 | // Update Count : 9
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| 14 | //
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| 15 |
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| 16 | #include <cassert> // for assert
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| 17 |
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| 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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| 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 "ResolvExpr/typeops.h" // for ptrsCastable
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| 26 | #include "ResolvExpr/Unify.h" // for typesCompatibleIgnoreQualifiers
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| 27 | #include "SymTab/Indexer.h" // for Indexer
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| 28 | #include "SynTree/Declaration.h" // for TypeDecl, NamedTypeDecl
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| 29 | #include "SynTree/Type.h" // for PointerType, Type, TypeInstType
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| 30 |
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| 31 | #if 0
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| 32 | #define PRINT(x) x
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| 33 | #else
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| 34 | #define PRINT(x)
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| 35 | #endif
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| 36 |
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| 37 | namespace ResolvExpr {
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| 38 | struct CastCost_old : public ConversionCost {
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| 39 | public:
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| 40 | CastCost_old( const Type * dest, bool srcIsLvalue,
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| 41 | const SymTab::Indexer &indexer, const TypeEnvironment &env, CostFunction costFunc );
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| 42 |
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| 43 | using ConversionCost::previsit;
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| 44 | using ConversionCost::postvisit;
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| 45 | void postvisit( const BasicType * basicType );
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| 46 | void postvisit( const PointerType * pointerType );
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| 47 | };
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| 48 |
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| 49 | Cost castCost( const Type * src, const Type * dest, bool srcIsLvalue,
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| 50 | const SymTab::Indexer &indexer, const TypeEnvironment &env ) {
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| 51 | if ( const TypeInstType * destAsTypeInst = dynamic_cast< const TypeInstType * >( dest ) ) {
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| 52 | if ( const EqvClass * eqvClass = env.lookup( destAsTypeInst->name ) ) {
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| 53 | if ( eqvClass->type ) {
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| 54 | return castCost( src, eqvClass->type, srcIsLvalue, indexer, env );
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| 55 | } else {
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| 56 | return Cost::infinity;
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| 57 | }
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| 58 | } else if ( const NamedTypeDecl * namedType = indexer.lookupType( destAsTypeInst->name ) ) {
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| 59 | // all typedefs should be gone by this point
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| 60 | const TypeDecl * type = strict_dynamic_cast< const TypeDecl * >( namedType );
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| 61 | if ( type->base ) {
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| 62 | return castCost( src, type->base, srcIsLvalue, indexer, env ) + Cost::safe;
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| 63 | } // if
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| 64 | } // if
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| 65 | } // if
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| 66 |
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| 67 | PRINT(
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| 68 | std::cerr << "castCost ::: src is ";
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| 69 | src->print( std::cerr );
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| 70 | std::cerr << std::endl << "dest is ";
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| 71 | dest->print( std::cerr );
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| 72 | std::cerr << std::endl << "env is" << std::endl;
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| 73 | env.print( std::cerr, 8 );
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| 74 | )
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| 75 |
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| 76 | if ( typesCompatibleIgnoreQualifiers( src, dest, indexer, env ) ) {
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| 77 | PRINT( std::cerr << "compatible!" << std::endl; )
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| 78 | return Cost::zero;
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| 79 | } else if ( dynamic_cast< const VoidType * >( dest ) ) {
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| 80 | return Cost::safe;
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| 81 | } else if ( const ReferenceType * refType = dynamic_cast< const ReferenceType * > ( dest ) ) {
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| 82 | PRINT( std::cerr << "conversionCost: dest is reference" << std::endl; )
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| 83 | return convertToReferenceCost( src, refType, srcIsLvalue, indexer, env, [](const Type * t1, const Type * t2, const SymTab::Indexer & indexer, const TypeEnvironment & env ) {
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| 84 | return ptrsCastable( t1, t2, env, indexer );
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| 85 | });
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| 86 | } else {
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| 87 | PassVisitor<CastCost_old> converter(
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| 88 | dest, srcIsLvalue, indexer, env,
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| 89 | (Cost (*)( const Type *, const Type *, bool, const SymTab::Indexer &, const TypeEnvironment & ))
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| 90 | castCost );
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| 91 | src->accept( converter );
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| 92 | if ( converter.pass.get_cost() == Cost::infinity ) {
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| 93 | return Cost::infinity;
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| 94 | } else {
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| 95 | // xxx - why are we adding cost 0 here?
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| 96 | return converter.pass.get_cost() + Cost::zero;
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| 97 | } // if
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| 98 | } // if
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| 99 | }
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| 100 |
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| 101 | CastCost_old::CastCost_old( const Type * dest, bool srcIsLvalue,
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| 102 | const SymTab::Indexer &indexer, const TypeEnvironment &env, CostFunction costFunc )
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| 103 | : ConversionCost( dest, srcIsLvalue, indexer, env, costFunc ) {
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| 104 | }
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| 105 |
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| 106 | void CastCost_old::postvisit( const BasicType * basicType ) {
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| 107 | const PointerType * destAsPointer = dynamic_cast< const PointerType * >( dest );
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| 108 | if ( destAsPointer && basicType->isInteger() ) {
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| 109 | // necessary for, e.g. unsigned long => void *
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| 110 | cost = Cost::unsafe;
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| 111 | } else {
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| 112 | cost = conversionCost( basicType, dest, srcIsLvalue, indexer, env );
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| 113 | } // if
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| 114 | }
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| 115 |
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| 116 | void CastCost_old::postvisit( const PointerType * pointerType ) {
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| 117 | if ( const PointerType * destAsPtr = dynamic_cast< const PointerType * >( dest ) ) {
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| 118 | if ( pointerType->tq <= destAsPtr->tq && typesCompatibleIgnoreQualifiers( pointerType->base, destAsPtr->base, indexer, env ) ) {
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| 119 | cost = Cost::safe;
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| 120 | } else {
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| 121 | TypeEnvironment newEnv( env );
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| 122 | newEnv.add( pointerType->forall );
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| 123 | newEnv.add( pointerType->base->forall );
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| 124 | int castResult = ptrsCastable( pointerType->base, destAsPtr->base, newEnv, indexer );
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| 125 | if ( castResult > 0 ) {
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| 126 | cost = Cost::safe;
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| 127 | } else if ( castResult < 0 ) {
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| 128 | cost = Cost::infinity;
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| 129 | } // if
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| 130 | } // if
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| 131 | } else if ( const BasicType * destAsBasic = dynamic_cast< const BasicType * >( dest ) ) {
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| 132 | if ( destAsBasic->isInteger() ) {
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| 133 | // necessary for, e.g. void * => unsigned long
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| 134 | cost = Cost::unsafe;
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| 135 | } // if
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| 136 | }
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| 137 | }
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| 138 |
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| 139 | namespace {
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| 140 | struct CastCost_new : public ConversionCost_new {
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| 141 | using ConversionCost_new::previsit;
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| 142 | using ConversionCost_new::postvisit;
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| 143 |
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| 144 | CastCost_new(
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| 145 | const ast::Type * dst, bool srcIsLvalue, const ast::SymbolTable & symtab,
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| 146 | const ast::TypeEnvironment & env, CostCalculation costFunc )
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| 147 | : ConversionCost_new( dst, srcIsLvalue, symtab, env, costFunc ) {}
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| 148 |
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| 149 | void postvisit( const ast::BasicType * basicType ) {
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| 150 | auto ptr = dynamic_cast< const ast::PointerType * >( dst );
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| 151 | if ( ptr && basicType->isInteger() ) {
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| 152 | // needed for, e.g. unsigned long => void *
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| 153 | cost = Cost::unsafe;
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| 154 | } else {
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| 155 | cost = conversionCost( basicType, dst, srcIsLvalue, symtab, env );
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| 156 | }
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| 157 | }
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| 158 |
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| 159 | void postvisit( const ast::PointerType * pointerType ) {
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| 160 | if ( auto ptr = dynamic_cast< const ast::PointerType * >( dst ) ) {
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| 161 | if (
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| 162 | pointerType->qualifiers <= ptr->qualifiers
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| 163 | && typesCompatibleIgnoreQualifiers( pointerType->base, ptr->base, symtab, env )
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| 164 | ) {
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| 165 | cost = Cost::safe;
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| 166 | } else {
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| 167 | ast::TypeEnvironment newEnv{ env };
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| 168 | if ( auto wParams = pointerType->base.as< ast::FunctionType >() ) {
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| 169 | newEnv.add( wParams->forall );
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| 170 | }
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| 171 | int castResult = ptrsCastable( pointerType->base, ptr->base, symtab, newEnv );
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| 172 | if ( castResult > 0 ) {
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| 173 | cost = Cost::safe;
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| 174 | } else if ( castResult < 0 ) {
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| 175 | cost = Cost::infinity;
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| 176 | }
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| 177 | }
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| 178 | } else if ( auto basic = dynamic_cast< const ast::BasicType * >( dst ) ) {
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| 179 | if ( basic->isInteger() ) {
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| 180 | // necessary for, e.g. void * => unsigned long
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| 181 | cost = Cost::unsafe;
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| 182 | }
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| 183 | }
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| 184 | }
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| 185 | };
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| 186 |
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| 187 | #warning For overload resolution between the two versions.
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| 188 | int localPtrsCastable(const ast::Type * t1, const ast::Type * t2,
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| 189 | const ast::SymbolTable & symtab, const ast::TypeEnvironment & env ) {
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| 190 | return ptrsCastable( t1, t2, symtab, env );
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| 191 | }
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| 192 | Cost localCastCost(
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| 193 | const ast::Type * src, const ast::Type * dst, bool srcIsLvalue,
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| 194 | const ast::SymbolTable & symtab, const ast::TypeEnvironment & env
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| 195 | ) { return castCost( src, dst, srcIsLvalue, symtab, env ); }
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| 196 | } // anonymous namespace
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| 197 |
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| 198 |
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| 199 |
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| 200 | Cost castCost(
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| 201 | const ast::Type * src, const ast::Type * dst, bool srcIsLvalue,
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| 202 | const ast::SymbolTable & symtab, const ast::TypeEnvironment & env
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| 203 | ) {
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| 204 | if ( auto typeInst = dynamic_cast< const ast::TypeInstType * >( dst ) ) {
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| 205 | if ( const ast::EqvClass * eqvClass = env.lookup( *typeInst ) ) {
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| 206 | // check cast cost against bound type, if present
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| 207 | if ( eqvClass->bound ) {
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| 208 | return castCost( src, eqvClass->bound, srcIsLvalue, symtab, env );
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| 209 | } else {
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| 210 | return Cost::infinity;
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| 211 | }
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| 212 | } else if ( const ast::NamedTypeDecl * named = symtab.lookupType( typeInst->name ) ) {
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| 213 | // all typedefs should be gone by now
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| 214 | auto type = strict_dynamic_cast< const ast::TypeDecl * >( named );
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| 215 | if ( type->base ) {
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| 216 | return castCost( src, type->base, srcIsLvalue, symtab, env ) + Cost::safe;
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| 217 | }
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| 218 | }
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| 219 | }
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| 220 |
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| 221 | PRINT(
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| 222 | std::cerr << "castCost ::: src is ";
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| 223 | ast::print( std::cerr, src );
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| 224 | std::cerr << std::endl << "dest is ";
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| 225 | ast::print( std::cerr, dst );
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| 226 | std::cerr << std::endl << "env is" << std::endl;
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| 227 | ast::print( std::cerr, env, 2 );
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| 228 | )
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| 229 |
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| 230 | if ( typesCompatibleIgnoreQualifiers( src, dst, symtab, env ) ) {
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| 231 | PRINT( std::cerr << "compatible!" << std::endl; )
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| 232 | return Cost::zero;
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| 233 | } else if ( dynamic_cast< const ast::VoidType * >( dst ) ) {
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| 234 | return Cost::safe;
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| 235 | } else if ( auto refType = dynamic_cast< const ast::ReferenceType * >( dst ) ) {
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| 236 | PRINT( std::cerr << "conversionCost: dest is reference" << std::endl; )
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| 237 | #warning cast on ptrsCastable artifact of having two functions, remove when port done
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| 238 | return convertToReferenceCost(
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| 239 | src, refType, srcIsLvalue, symtab, env, localPtrsCastable );
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| 240 | } else {
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| 241 | #warning cast on castCost artifact of having two functions, remove when port done
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| 242 | ast::Pass< CastCost_new > converter(
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| 243 | dst, srcIsLvalue, symtab, env, localCastCost );
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| 244 | src->accept( converter );
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| 245 | return converter.core.cost;
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| 246 | }
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| 247 | }
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| 248 |
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| 249 | } // namespace ResolvExpr
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| 250 |
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| 251 | // Local Variables: //
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| 252 | // tab-width: 4 //
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| 253 | // mode: c++ //
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| 254 | // compile-command: "make install" //
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| 255 | // End: //
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