| 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 | // ConversionCost.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 07:06:19 2015
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| 11 | // Last Modified By : Andrew Beach
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| 12 | // Last Modified On : Mon Aug 12 10:21:00 2019
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| 13 | // Update Count : 27
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| 14 | //
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| 15 |
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| 16 | #include "ConversionCost.h"
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| 17 |
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| 18 | #include <cassert> // for assert
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| 19 | #include <list> // for list, list<>::const_iterator
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| 20 | #include <string> // for operator==, string
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| 21 |
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| 22 | #include "ResolvExpr/Cost.h" // for Cost
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| 23 | #include "ResolvExpr/TypeEnvironment.h" // for EqvClass, TypeEnvironment
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| 24 | #include "SymTab/Indexer.h" // for Indexer
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| 25 | #include "SynTree/Declaration.h" // for TypeDecl, NamedTypeDecl
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| 26 | #include "SynTree/Type.h" // for Type, BasicType, TypeInstType
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| 27 | #include "typeops.h" // for typesCompatibleIgnoreQualifiers
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| 28 |
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| 29 | namespace ResolvExpr {
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| 30 | #if 0
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| 31 | const Cost Cost::zero = Cost{ 0, 0, 0, 0, 0, 0, 0 };
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| 32 | const Cost Cost::infinity = Cost{ -1, -1, -1, -1, -1, 1, -1 };
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| 33 | const Cost Cost::unsafe = Cost{ 1, 0, 0, 0, 0, 0, 0 };
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| 34 | const Cost Cost::poly = Cost{ 0, 1, 0, 0, 0, 0, 0 };
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| 35 | const Cost Cost::safe = Cost{ 0, 0, 1, 0, 0, 0, 0 };
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| 36 | const Cost Cost::sign = Cost{ 0, 0, 0, 1, 0, 0, 0 };
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| 37 | const Cost Cost::var = Cost{ 0, 0, 0, 0, 1, 0, 0 };
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| 38 | const Cost Cost::spec = Cost{ 0, 0, 0, 0, 0, -1, 0 };
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| 39 | const Cost Cost::reference = Cost{ 0, 0, 0, 0, 0, 0, 1 };
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| 40 | #endif
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| 41 |
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| 42 | #if 0
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| 43 | #define PRINT(x) x
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| 44 | #else
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| 45 | #define PRINT(x)
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| 46 | #endif
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| 47 |
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| 48 | Cost conversionCost( const Type * src, const Type * dest, bool srcIsLvalue,
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| 49 | const SymTab::Indexer &indexer, const TypeEnvironment &env ) {
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| 50 | if ( const TypeInstType * destAsTypeInst = dynamic_cast< const TypeInstType * >( dest ) ) {
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| 51 | PRINT( std::cerr << "type inst " << destAsTypeInst->name; )
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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 conversionCost( 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 | PRINT( std::cerr << " found" << std::endl; )
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| 60 | const TypeDecl * type = dynamic_cast< const TypeDecl * >( namedType );
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| 61 | // all typedefs should be gone by this point
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| 62 | assert( type );
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| 63 | if ( type->base ) {
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| 64 | return conversionCost( src, type->base, srcIsLvalue, indexer, env )
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| 65 | + Cost::safe;
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| 66 | } // if
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| 67 | } // if
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| 68 | PRINT( std::cerr << " not found" << std::endl; )
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| 69 | } // if
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| 70 | PRINT(
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| 71 | std::cerr << "src is ";
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| 72 | src->print( std::cerr );
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| 73 | std::cerr << std::endl << "dest is ";
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| 74 | dest->print( std::cerr );
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| 75 | std::cerr << std::endl << "env is" << std::endl;
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| 76 | env.print( std::cerr, 8 );
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| 77 | )
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| 78 | if ( typesCompatibleIgnoreQualifiers( src, dest, indexer, env ) ) {
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| 79 | PRINT( std::cerr << "compatible!" << std::endl; )
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| 80 | return Cost::zero;
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| 81 | } else if ( dynamic_cast< const VoidType * >( dest ) ) {
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| 82 | return Cost::safe;
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| 83 | } else if ( const ReferenceType * refType = dynamic_cast< const ReferenceType * > ( dest ) ) {
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| 84 | PRINT( std::cerr << "conversionCost: dest is reference" << std::endl; )
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| 85 | return convertToReferenceCost( src, refType, srcIsLvalue, indexer, env, [](const Type * const t1, const Type * t2, const SymTab::Indexer &, const TypeEnvironment & env ){
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| 86 | return ptrsAssignable( t1, t2, env );
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| 87 | });
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| 88 | } else {
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| 89 | PassVisitor<ConversionCost> converter(
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| 90 | dest, srcIsLvalue, indexer, env,
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| 91 | (Cost (*)(const Type *, const Type *, bool, const SymTab::Indexer&, const TypeEnvironment&))
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| 92 | conversionCost );
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| 93 | src->accept( converter );
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| 94 | if ( converter.pass.get_cost() == Cost::infinity ) {
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| 95 | return Cost::infinity;
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| 96 | } else {
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| 97 | return converter.pass.get_cost() + Cost::zero;
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| 98 | } // if
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| 99 | } // if
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| 100 | }
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| 101 |
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| 102 | static Cost convertToReferenceCost( const Type * src, const Type * dest, bool srcIsLvalue,
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| 103 | int diff, const SymTab::Indexer & indexer, const TypeEnvironment & env, PtrsFunction func ) {
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| 104 | PRINT( std::cerr << "convert to reference cost... diff " << diff << " " << src << " / " << dest << std::endl; )
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| 105 | if ( diff > 0 ) {
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| 106 | // TODO: document this
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| 107 | Cost cost = convertToReferenceCost(
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| 108 | strict_dynamic_cast< const ReferenceType * >( src )->base, dest, srcIsLvalue,
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| 109 | diff-1, indexer, env, func );
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| 110 | cost.incReference();
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| 111 | return cost;
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| 112 | } else if ( diff < -1 ) {
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| 113 | // TODO: document this
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| 114 | Cost cost = convertToReferenceCost(
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| 115 | src, strict_dynamic_cast< const ReferenceType * >( dest )->base, srcIsLvalue,
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| 116 | diff+1, indexer, env, func );
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| 117 | cost.incReference();
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| 118 | return cost;
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| 119 | } else if ( diff == 0 ) {
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| 120 | const ReferenceType * srcAsRef = dynamic_cast< const ReferenceType * >( src );
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| 121 | const ReferenceType * destAsRef = dynamic_cast< const ReferenceType * >( dest );
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| 122 | if ( srcAsRef && destAsRef ) { // pointer-like conversions between references
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| 123 | PRINT( std::cerr << "converting between references" << std::endl; )
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| 124 | Type::Qualifiers tq1 = srcAsRef->base->tq;
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| 125 | Type::Qualifiers tq2 = destAsRef->base->tq;
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| 126 | if ( tq1 <= tq2 && typesCompatibleIgnoreQualifiers( srcAsRef->base, destAsRef->base, indexer, env ) ) {
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| 127 | PRINT( std::cerr << " :: compatible and good qualifiers" << std::endl; )
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| 128 | if ( tq1 == tq2 ) {
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| 129 | // types are the same
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| 130 | return Cost::zero;
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| 131 | } else {
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| 132 | // types are the same, except otherPointer has more qualifiers
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| 133 | return Cost::safe;
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| 134 | }
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| 135 | } else { // xxx - this discards reference qualifiers from consideration -- reducing qualifiers is a safe conversion; is this right?
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| 136 | int assignResult = func( srcAsRef->base, destAsRef->base, indexer, env );
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| 137 | PRINT( std::cerr << "comparing references: " << assignResult << " " << srcAsRef << " " << destAsRef << std::endl; )
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| 138 | if ( assignResult > 0 ) {
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| 139 | return Cost::safe;
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| 140 | } else if ( assignResult < 0 ) {
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| 141 | return Cost::unsafe;
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| 142 | } // if
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| 143 | } // if
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| 144 | } else {
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| 145 | PRINT( std::cerr << "reference to rvalue conversion" << std::endl; )
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| 146 | PassVisitor<ConversionCost> converter(
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| 147 | dest, srcIsLvalue, indexer, env,
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| 148 | (Cost (*)(const Type *, const Type *, bool, const SymTab::Indexer&, const TypeEnvironment&))
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| 149 | conversionCost );
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| 150 | src->accept( converter );
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| 151 | return converter.pass.get_cost();
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| 152 | } // if
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| 153 | } else {
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| 154 | const ReferenceType * destAsRef = dynamic_cast< const ReferenceType * >( dest );
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| 155 | assert( diff == -1 && destAsRef );
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| 156 | PRINT( std::cerr << "dest is: " << dest << " / src is: " << src << std::endl; )
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| 157 | if ( typesCompatibleIgnoreQualifiers( src, destAsRef->base, indexer, env ) ) {
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| 158 | PRINT( std::cerr << "converting compatible base type" << std::endl; )
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| 159 | if ( srcIsLvalue ) {
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| 160 | PRINT(
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| 161 | std::cerr << "lvalue to reference conversion" << std::endl;
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| 162 | std::cerr << src << " => " << destAsRef << std::endl;
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| 163 | )
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| 164 | // lvalue-to-reference conversion: cv lvalue T => cv T &
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| 165 | if ( src->tq == destAsRef->base->tq ) {
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| 166 | return Cost::reference; // cost needs to be non-zero to add cast
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| 167 | } if ( src->tq < destAsRef->base->tq ) {
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| 168 | return Cost::safe; // cost needs to be higher than previous cast to differentiate adding qualifiers vs. keeping same
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| 169 | } else {
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| 170 | return Cost::unsafe;
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| 171 | } // if
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| 172 | } else if ( destAsRef->base->get_const() ) {
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| 173 | PRINT( std::cerr << "rvalue to const ref conversion" << std::endl; )
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| 174 | // rvalue-to-const-reference conversion: T => const T &
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| 175 | return Cost::safe;
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| 176 | } else {
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| 177 | PRINT( std::cerr << "rvalue to non-const reference conversion" << std::endl; )
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| 178 | // rvalue-to-reference conversion: T => T &
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| 179 | return Cost::unsafe;
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| 180 | } // if
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| 181 | } // if
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| 182 | PRINT( std::cerr << "attempting to convert from incompatible base type -- fail" << std::endl; )
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| 183 | }
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| 184 | return Cost::infinity;
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| 185 | }
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| 186 |
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| 187 | Cost convertToReferenceCost( const Type * src, const ReferenceType * dest, bool srcIsLvalue,
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| 188 | const SymTab::Indexer & indexer, const TypeEnvironment & env, PtrsFunction func ) {
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| 189 | int sdepth = src->referenceDepth(), ddepth = dest->referenceDepth();
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| 190 | Cost cost = convertToReferenceCost( src, dest, srcIsLvalue, sdepth-ddepth, indexer, env, func );
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| 191 | PRINT( std::cerr << "convertToReferenceCost result: " << cost << std::endl; )
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| 192 | return cost;
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| 193 | }
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| 194 |
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| 195 | ConversionCost::ConversionCost( const Type * dest, bool srcIsLvalue, const SymTab::Indexer &indexer, const TypeEnvironment &env, CostFunction costFunc )
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| 196 | : dest( dest ), srcIsLvalue( srcIsLvalue ), indexer( indexer ), cost( Cost::infinity ), env( env ), costFunc( costFunc ) {
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| 197 | }
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| 198 |
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| 199 | // GENERATED START, DO NOT EDIT
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| 200 | // GENERATED BY BasicTypes-gen.cc
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| 201 | /* EXTENDED INTEGRAL RANK HIERARCHY (root to leaves)
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| 202 | _Bool
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| 203 | char signed char unsigned char
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| 204 | signed short int unsigned short int
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| 205 | signed int unsigned int
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| 206 | signed long int unsigned long int
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| 207 | signed long long int unsigned long long int
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| 208 | __int128 unsigned __int128
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| 209 | _Float16 _Float16 _Complex
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| 210 | _Float32 _Float32 _Complex
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| 211 | float float _Complex
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| 212 | _Float32x _Float32x _Complex
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| 213 | _Float64 _Float64 _Complex
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| 214 | double double _Complex
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| 215 | _Float64x _Float64x _Complex
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| 216 | __float80
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| 217 | _Float128 _Float128 _Complex
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| 218 | __float128
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| 219 | long double long double _Complex
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| 220 | _Float128x _Float128x _Complex
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| 221 | */
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| 222 | // GENERATED END
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| 223 |
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| 224 | // GENERATED START, DO NOT EDIT
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| 225 | // GENERATED BY BasicTypes-gen.cc
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| 226 | static const int costMatrix[BasicType::NUMBER_OF_BASIC_TYPES][BasicType::NUMBER_OF_BASIC_TYPES] = { // path length from root to node
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| 227 | /* B C SC UC SI SUI I UI LI LUI LLI LLUI IB UIB _FH _FH _F _FC F FC _FX _FXC FD _FDC D DC F80X_FDXC F80 _FB_FLDC FB LD LDC _FBX_FLDXC */
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| 228 | /* B */ { 0, 1, 1, 2, 2, 3, 3, 4, 4, 5, 5, 6, 6, 7, 7, 8, 8, 9, 9, 10, 10, 11, 11, 12, 12, 13, 13, 14, 14, 15, 15, 16, 17, 16, 18, 17, },
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| 229 | /* C */ { -1, 0, 1, 1, 1, 2, 2, 3, 3, 4, 4, 5, 5, 6, 6, 7, 7, 8, 8, 9, 9, 10, 10, 11, 11, 12, 12, 13, 13, 14, 14, 15, 16, 15, 17, 16, },
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| 230 | /* SC */ { -1, -1, 0, 1, 1, 2, 2, 3, 3, 4, 4, 5, 5, 6, 6, 7, 7, 8, 8, 9, 9, 10, 10, 11, 11, 12, 12, 13, 13, 14, 14, 15, 16, 15, 17, 16, },
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| 231 | /* UC */ { -1, -1, -1, 0, 1, 1, 2, 2, 3, 3, 4, 4, 5, 5, 6, 7, 7, 8, 8, 9, 9, 10, 10, 11, 11, 12, 12, 13, 13, 14, 14, 15, 16, 15, 17, 16, },
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| 232 | /* SI */ { -1, -1, -1, -1, 0, 1, 1, 2, 2, 3, 3, 4, 4, 5, 5, 6, 6, 7, 7, 8, 8, 9, 9, 10, 10, 11, 11, 12, 12, 13, 13, 14, 15, 14, 16, 15, },
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| 233 | /* SUI */ { -1, -1, -1, -1, -1, 0, 1, 1, 2, 2, 3, 3, 4, 4, 5, 6, 6, 7, 7, 8, 8, 9, 9, 10, 10, 11, 11, 12, 12, 13, 13, 14, 15, 14, 16, 15, },
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| 234 | /* I */ { -1, -1, -1, -1, -1, -1, 0, 1, 1, 2, 2, 3, 3, 4, 4, 5, 5, 6, 6, 7, 7, 8, 8, 9, 9, 10, 10, 11, 11, 12, 12, 13, 14, 13, 15, 14, },
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| 235 | /* UI */ { -1, -1, -1, -1, -1, -1, -1, 0, 1, 1, 2, 2, 3, 3, 4, 5, 5, 6, 6, 7, 7, 8, 8, 9, 9, 10, 10, 11, 11, 12, 12, 13, 14, 13, 15, 14, },
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| 236 | /* LI */ { -1, -1, -1, -1, -1, -1, -1, -1, 0, 1, 1, 2, 2, 3, 3, 4, 4, 5, 5, 6, 6, 7, 7, 8, 8, 9, 9, 10, 10, 11, 11, 12, 13, 12, 14, 13, },
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| 237 | /* LUI */ { -1, -1, -1, -1, -1, -1, -1, -1, -1, 0, 1, 1, 2, 2, 3, 4, 4, 5, 5, 6, 6, 7, 7, 8, 8, 9, 9, 10, 10, 11, 11, 12, 13, 12, 14, 13, },
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| 238 | /* LLI */ { -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, 0, 1, 1, 2, 2, 3, 3, 4, 4, 5, 5, 6, 6, 7, 7, 8, 8, 9, 9, 10, 10, 11, 12, 11, 13, 12, },
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| 239 | /* LLUI */ { -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, 0, 1, 1, 2, 3, 3, 4, 4, 5, 5, 6, 6, 7, 7, 8, 8, 9, 9, 10, 10, 11, 12, 11, 13, 12, },
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| 240 | /* IB */ { -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, 0, 1, 1, 2, 2, 3, 3, 4, 4, 5, 5, 6, 6, 7, 7, 8, 8, 9, 9, 10, 11, 10, 12, 11, },
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| 241 | /* UIB */ { -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, 0, 1, 2, 2, 3, 3, 4, 4, 5, 5, 6, 6, 7, 7, 8, 8, 9, 9, 10, 11, 10, 12, 11, },
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| 242 | /* _FH */ { -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, 0, 1, 1, 2, 2, 3, 3, 4, 4, 5, 5, 6, 6, 7, 7, 8, 8, 9, 10, 9, 11, 10, },
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| 243 | /* _FH */ { -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, 0, -1, 1, -1, 2, -1, 3, -1, 4, -1, 5, -1, 6, -1, -1, 7, -1, -1, 8, -1, 9, },
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| 244 | /* _F */ { -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, 0, 1, 1, 2, 2, 3, 3, 4, 4, 5, 5, 6, 6, 7, 7, 8, 9, 8, 10, 9, },
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| 245 | /* _FC */ { -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, 0, -1, 1, -1, 2, -1, 3, -1, 4, -1, 5, -1, -1, 6, -1, -1, 7, -1, 8, },
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| 246 | /* F */ { -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, 0, 1, 1, 2, 2, 3, 3, 4, 4, 5, 5, 6, 6, 7, 8, 7, 9, 8, },
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| 247 | /* FC */ { -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, 0, -1, 1, -1, 2, -1, 3, -1, 4, -1, -1, 5, -1, -1, 6, -1, 7, },
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| 248 | /* _FX */ { -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, 0, 1, 1, 2, 2, 3, 3, 4, 4, 5, 5, 6, 7, 6, 8, 7, },
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| 249 | /* _FXC */ { -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, 0, -1, 1, -1, 2, -1, 3, -1, -1, 4, -1, -1, 5, -1, 6, },
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| 250 | /* FD */ { -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, 0, 1, 1, 2, 2, 3, 3, 4, 4, 5, 6, 5, 7, 6, },
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| 251 | /* _FDC */ { -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, 0, -1, 1, -1, 2, -1, -1, 3, -1, -1, 4, -1, 5, },
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| 252 | /* D */ { -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, 0, 1, 1, 2, 2, 3, 3, 4, 5, 4, 6, 5, },
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| 253 | /* DC */ { -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, 0, -1, 1, -1, -1, 2, -1, -1, 3, -1, 4, },
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| 254 | /* F80X */ { -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, 0, 1, 1, 2, 2, 3, 4, 3, 5, 4, },
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|---|
| 255 | /* _FDXC */ { -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, 0, -1, -1, 1, -1, -1, 2, -1, 3, },
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|---|
| 256 | /* F80 */ { -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, 1, 0, 1, 2, 2, 3, 3, 4, 4, },
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|---|
| 257 | /* _FB */ { -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, 0, 1, 1, 2, 2, 3, 3, },
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|---|
| 258 | /* _FLDC */ { -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, 0, -1, -1, 1, -1, 2, },
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|---|
| 259 | /* FB */ { -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, 1, 0, 1, 2, 2, 3, },
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|---|
| 260 | /* LD */ { -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, 0, 1, 1, 2, },
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|---|
| 261 | /* LDC */ { -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, 0, -1, 1, },
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|---|
| 262 | /* _FBX */ { -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, 0, 1, },
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|---|
| 263 | /* _FLDXC */ { -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, 0, },
|
|---|
| 264 | }; // costMatrix
|
|---|
| 265 | static const int maxIntCost = 15;
|
|---|
| 266 | // GENERATED END
|
|---|
| 267 | static_assert(
|
|---|
| 268 | sizeof(costMatrix)/sizeof(costMatrix[0][0]) == BasicType::NUMBER_OF_BASIC_TYPES * BasicType::NUMBER_OF_BASIC_TYPES,
|
|---|
| 269 | "Missing row in the cost matrix"
|
|---|
| 270 | );
|
|---|
| 271 |
|
|---|
| 272 | // GENERATED START, DO NOT EDIT
|
|---|
| 273 | // GENERATED BY BasicTypes-gen.cc
|
|---|
| 274 | static const int signMatrix[BasicType::NUMBER_OF_BASIC_TYPES][BasicType::NUMBER_OF_BASIC_TYPES] = { // number of sign changes in safe conversion
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| 275 | /* B C SC UC SI SUI I UI LI LUI LLI LLUI IB UIB _FH _FH _F _FC F FC _FX _FXC FD _FDC D DC F80X_FDXC F80 _FB_FLDC FB LD LDC _FBX_FLDXC */
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| 276 | /* B */ { 0, 0, 0, 1, 0, 1, 0, 1, 0, 1, 0, 1, 0, 1, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, },
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| 277 | /* C */ { -1, 0, 0, 1, 0, 1, 0, 1, 0, 1, 0, 1, 0, 1, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, },
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|---|
| 278 | /* SC */ { -1, -1, 0, 1, 0, 1, 0, 1, 0, 1, 0, 1, 0, 1, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, },
|
|---|
| 279 | /* UC */ { -1, -1, -1, 0, 1, 0, 1, 0, 1, 0, 1, 0, 1, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, },
|
|---|
| 280 | /* SI */ { -1, -1, -1, -1, 0, 1, 0, 1, 0, 1, 0, 1, 0, 1, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, },
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|---|
| 281 | /* SUI */ { -1, -1, -1, -1, -1, 0, 1, 0, 1, 0, 1, 0, 1, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, },
|
|---|
| 282 | /* I */ { -1, -1, -1, -1, -1, -1, 0, 1, 0, 1, 0, 1, 0, 1, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, },
|
|---|
| 283 | /* UI */ { -1, -1, -1, -1, -1, -1, -1, 0, 1, 0, 1, 0, 1, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, },
|
|---|
| 284 | /* LI */ { -1, -1, -1, -1, -1, -1, -1, -1, 0, 1, 0, 1, 0, 1, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, },
|
|---|
| 285 | /* LUI */ { -1, -1, -1, -1, -1, -1, -1, -1, -1, 0, 1, 0, 1, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, },
|
|---|
| 286 | /* LLI */ { -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, 0, 1, 0, 1, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, },
|
|---|
| 287 | /* LLUI */ { -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, 0, 1, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, },
|
|---|
| 288 | /* IB */ { -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, 0, 1, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, },
|
|---|
| 289 | /* UIB */ { -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, },
|
|---|
| 290 | /* _FH */ { -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, },
|
|---|
| 291 | /* _FH */ { -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, 0, -1, 0, -1, 0, -1, 0, -1, 0, -1, 0, -1, 0, -1, -1, 0, -1, -1, 0, -1, 0, },
|
|---|
| 292 | /* _F */ { -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, },
|
|---|
| 293 | /* _FC */ { -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, 0, -1, 0, -1, 0, -1, 0, -1, 0, -1, 0, -1, -1, 0, -1, -1, 0, -1, 0, },
|
|---|
| 294 | /* F */ { -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, },
|
|---|
| 295 | /* FC */ { -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, 0, -1, 0, -1, 0, -1, 0, -1, 0, -1, -1, 0, -1, -1, 0, -1, 0, },
|
|---|
| 296 | /* _FX */ { -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, },
|
|---|
| 297 | /* _FXC */ { -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, 0, -1, 0, -1, 0, -1, 0, -1, -1, 0, -1, -1, 0, -1, 0, },
|
|---|
| 298 | /* FD */ { -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, },
|
|---|
| 299 | /* _FDC */ { -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, 0, -1, 0, -1, 0, -1, -1, 0, -1, -1, 0, -1, 0, },
|
|---|
| 300 | /* D */ { -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, },
|
|---|
| 301 | /* DC */ { -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, 0, -1, 0, -1, -1, 0, -1, -1, 0, -1, 0, },
|
|---|
| 302 | /* F80X */ { -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, },
|
|---|
| 303 | /* _FDXC */ { -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, 0, -1, -1, 0, -1, -1, 0, -1, 0, },
|
|---|
| 304 | /* F80 */ { -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, 0, 0, 0, 0, 0, 0, 0, 0, 0, },
|
|---|
| 305 | /* _FB */ { -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, 0, 0, 0, 0, 0, 0, 0, },
|
|---|
| 306 | /* _FLDC */ { -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, 0, -1, -1, 0, -1, 0, },
|
|---|
| 307 | /* FB */ { -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, 0, 0, 0, 0, 0, 0, },
|
|---|
| 308 | /* LD */ { -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, 0, 0, 0, 0, },
|
|---|
| 309 | /* LDC */ { -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, 0, -1, 0, },
|
|---|
| 310 | /* _FBX */ { -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, 0, 0, },
|
|---|
| 311 | /* _FLDXC */ { -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, 0, },
|
|---|
| 312 | }; // signMatrix
|
|---|
| 313 | // GENERATED END
|
|---|
| 314 | static_assert(
|
|---|
| 315 | sizeof(signMatrix)/sizeof(signMatrix[0][0]) == BasicType::NUMBER_OF_BASIC_TYPES * BasicType::NUMBER_OF_BASIC_TYPES,
|
|---|
| 316 | "Missing row in the sign matrix"
|
|---|
| 317 | );
|
|---|
| 318 |
|
|---|
| 319 | void ConversionCost::postvisit( const VoidType * ) {
|
|---|
| 320 | cost = Cost::infinity;
|
|---|
| 321 | }
|
|---|
| 322 |
|
|---|
| 323 | void ConversionCost::postvisit(const BasicType * basicType) {
|
|---|
| 324 | if ( const BasicType * destAsBasic = dynamic_cast< const BasicType * >( dest ) ) {
|
|---|
| 325 | int tableResult = costMatrix[ basicType->kind ][ destAsBasic->kind ];
|
|---|
| 326 | if ( tableResult == -1 ) {
|
|---|
| 327 | cost = Cost::unsafe;
|
|---|
| 328 | } else {
|
|---|
| 329 | cost = Cost::zero;
|
|---|
| 330 | cost.incSafe( tableResult );
|
|---|
| 331 | cost.incSign( signMatrix[ basicType->kind ][ destAsBasic->kind ] );
|
|---|
| 332 | } // if
|
|---|
| 333 | } else if ( dynamic_cast< const EnumInstType * >( dest ) ) {
|
|---|
| 334 | // xxx - not positive this is correct, but appears to allow casting int => enum
|
|---|
| 335 | cost = Cost::unsafe;
|
|---|
| 336 | } // if
|
|---|
| 337 | // no cases for zero_t/one_t because it should not be possible to convert int, etc. to zero_t/one_t.
|
|---|
| 338 | }
|
|---|
| 339 |
|
|---|
| 340 | void ConversionCost::postvisit( const PointerType * pointerType ) {
|
|---|
| 341 | if ( const PointerType * destAsPtr = dynamic_cast< const PointerType * >( dest ) ) {
|
|---|
| 342 | PRINT( std::cerr << pointerType << " ===> " << destAsPtr << std::endl; )
|
|---|
| 343 | Type::Qualifiers tq1 = pointerType->base->tq;
|
|---|
| 344 | Type::Qualifiers tq2 = destAsPtr->base->tq;
|
|---|
| 345 | if ( tq1 <= tq2 && typesCompatibleIgnoreQualifiers( pointerType->base, destAsPtr->base, indexer, env ) ) {
|
|---|
| 346 | PRINT( std::cerr << " :: compatible and good qualifiers" << std::endl; )
|
|---|
| 347 | if ( tq1 == tq2 ) {
|
|---|
| 348 | // types are the same
|
|---|
| 349 | cost = Cost::zero;
|
|---|
| 350 | } else {
|
|---|
| 351 | // types are the same, except otherPointer has more qualifiers
|
|---|
| 352 | cost = Cost::safe;
|
|---|
| 353 | } // if
|
|---|
| 354 | } else {
|
|---|
| 355 | int assignResult = ptrsAssignable( pointerType->base, destAsPtr->base, env );
|
|---|
| 356 | PRINT( std::cerr << " :: " << assignResult << std::endl; )
|
|---|
| 357 | if ( assignResult > 0 && tq1 <= tq2 ) {
|
|---|
| 358 | // xxx - want the case where qualifiers are added to be more expensive than the case where qualifiers are the same. Is 1 safe vs. 2 safe correct?
|
|---|
| 359 | if ( tq1 == tq2 ) {
|
|---|
| 360 | cost = Cost::safe;
|
|---|
| 361 | } else if ( tq1 < tq2 ) {
|
|---|
| 362 | cost = Cost::safe+Cost::safe;
|
|---|
| 363 | }
|
|---|
| 364 | } else if ( assignResult < 0 ) {
|
|---|
| 365 | cost = Cost::unsafe;
|
|---|
| 366 | } // if
|
|---|
| 367 | // assignResult == 0 means Cost::Infinity
|
|---|
| 368 | } // if
|
|---|
| 369 | // case case for zero_t because it should not be possible to convert pointers to zero_t.
|
|---|
| 370 | } // if
|
|---|
| 371 | }
|
|---|
| 372 |
|
|---|
| 373 | void ConversionCost::postvisit( const ArrayType * ) {}
|
|---|
| 374 |
|
|---|
| 375 | void ConversionCost::postvisit( const ReferenceType * refType ) {
|
|---|
| 376 | // Note: dest can never be a reference, since it would have been caught in an earlier check
|
|---|
| 377 | assert( ! dynamic_cast< const ReferenceType * >( dest ) );
|
|---|
| 378 | // convert reference to rvalue: cv T1 & => T2
|
|---|
| 379 | // recursively compute conversion cost from T1 to T2.
|
|---|
| 380 | // cv can be safely dropped because of 'implicit dereference' behavior.
|
|---|
| 381 | cost = costFunc( refType->base, dest, srcIsLvalue, indexer, env );
|
|---|
| 382 | if ( refType->base->tq == dest->tq ) {
|
|---|
| 383 | cost.incReference(); // prefer exact qualifiers
|
|---|
| 384 | } else if ( refType->base->tq < dest->tq ) {
|
|---|
| 385 | cost.incSafe(); // then gaining qualifiers
|
|---|
| 386 | } else {
|
|---|
| 387 | cost.incUnsafe(); // lose qualifiers as last resort
|
|---|
| 388 | }
|
|---|
| 389 | PRINT( std::cerr << refType << " ==> " << dest << " " << cost << std::endl; )
|
|---|
| 390 | }
|
|---|
| 391 |
|
|---|
| 392 | void ConversionCost::postvisit( const FunctionType * ) {}
|
|---|
| 393 |
|
|---|
| 394 | void ConversionCost::postvisit( const StructInstType * inst ) {
|
|---|
| 395 | if ( const StructInstType * destAsInst = dynamic_cast< const StructInstType * >( dest ) ) {
|
|---|
| 396 | if ( inst->name == destAsInst->name ) {
|
|---|
| 397 | cost = Cost::zero;
|
|---|
| 398 | } // if
|
|---|
| 399 | } // if
|
|---|
| 400 | }
|
|---|
| 401 |
|
|---|
| 402 | void ConversionCost::postvisit( const UnionInstType * inst ) {
|
|---|
| 403 | if ( const UnionInstType * destAsInst = dynamic_cast< const UnionInstType * >( dest ) ) {
|
|---|
| 404 | if ( inst->name == destAsInst->name ) {
|
|---|
| 405 | cost = Cost::zero;
|
|---|
| 406 | } // if
|
|---|
| 407 | } // if
|
|---|
| 408 | }
|
|---|
| 409 |
|
|---|
| 410 | void ConversionCost::postvisit( const EnumInstType * ) {
|
|---|
| 411 | static Type::Qualifiers q;
|
|---|
| 412 | static BasicType integer( q, BasicType::SignedInt );
|
|---|
| 413 | cost = costFunc( &integer, dest, srcIsLvalue, indexer, env ); // safe if dest >= int
|
|---|
| 414 | if ( cost < Cost::unsafe ) {
|
|---|
| 415 | cost.incSafe();
|
|---|
| 416 | } // if
|
|---|
| 417 | }
|
|---|
| 418 |
|
|---|
| 419 | void ConversionCost::postvisit( const TraitInstType * ) {}
|
|---|
| 420 |
|
|---|
| 421 | void ConversionCost::postvisit( const TypeInstType * inst ) {
|
|---|
| 422 | if ( const EqvClass * eqvClass = env.lookup( inst->name ) ) {
|
|---|
| 423 | cost = costFunc( eqvClass->type, dest, srcIsLvalue, indexer, env );
|
|---|
| 424 | } else if ( const TypeInstType * destAsInst = dynamic_cast< const TypeInstType * >( dest ) ) {
|
|---|
| 425 | if ( inst->name == destAsInst->name ) {
|
|---|
| 426 | cost = Cost::zero;
|
|---|
| 427 | }
|
|---|
| 428 | } else if ( const NamedTypeDecl * namedType = indexer.lookupType( inst->name ) ) {
|
|---|
| 429 | const TypeDecl * type = dynamic_cast< const TypeDecl * >( namedType );
|
|---|
| 430 | // all typedefs should be gone by this point
|
|---|
| 431 | assert( type );
|
|---|
| 432 | if ( type->base ) {
|
|---|
| 433 | cost = costFunc( type->base, dest, srcIsLvalue, indexer, env ) + Cost::safe;
|
|---|
| 434 | } // if
|
|---|
| 435 | } // if
|
|---|
| 436 | }
|
|---|
| 437 |
|
|---|
| 438 | void ConversionCost::postvisit( const TupleType * tupleType ) {
|
|---|
| 439 | Cost c = Cost::zero;
|
|---|
| 440 | if ( const TupleType * destAsTuple = dynamic_cast< const TupleType * >( dest ) ) {
|
|---|
| 441 | std::list< Type * >::const_iterator srcIt = tupleType->types.begin();
|
|---|
| 442 | std::list< Type * >::const_iterator destIt = destAsTuple->types.begin();
|
|---|
| 443 | while ( srcIt != tupleType->types.end() && destIt != destAsTuple->types.end() ) {
|
|---|
| 444 | Cost newCost = costFunc( * srcIt++, * destIt++, srcIsLvalue, indexer, env );
|
|---|
| 445 | if ( newCost == Cost::infinity ) {
|
|---|
| 446 | return;
|
|---|
| 447 | } // if
|
|---|
| 448 | c += newCost;
|
|---|
| 449 | } // while
|
|---|
| 450 | if ( destIt != destAsTuple->types.end() ) {
|
|---|
| 451 | cost = Cost::infinity;
|
|---|
| 452 | } else {
|
|---|
| 453 | cost = c;
|
|---|
| 454 | } // if
|
|---|
| 455 | } // if
|
|---|
| 456 | }
|
|---|
| 457 |
|
|---|
| 458 | void ConversionCost::postvisit( const VarArgsType * ) {
|
|---|
| 459 | if ( dynamic_cast< const VarArgsType * >( dest ) ) {
|
|---|
| 460 | cost = Cost::zero;
|
|---|
| 461 | }
|
|---|
| 462 | }
|
|---|
| 463 |
|
|---|
| 464 | void ConversionCost::postvisit( const ZeroType * ) {
|
|---|
| 465 | if ( dynamic_cast< const ZeroType * >( dest ) ) {
|
|---|
| 466 | cost = Cost::zero;
|
|---|
| 467 | } else if ( const BasicType * destAsBasic = dynamic_cast< const BasicType * >( dest ) ) {
|
|---|
| 468 | // copied from visit(BasicType *) for signed int, but +1 for safe conversions
|
|---|
| 469 | int tableResult = costMatrix[ BasicType::SignedInt ][ destAsBasic->kind ];
|
|---|
| 470 | if ( tableResult == -1 ) {
|
|---|
| 471 | cost = Cost::unsafe;
|
|---|
| 472 | } else {
|
|---|
| 473 | cost = Cost::zero;
|
|---|
| 474 | cost.incSafe( tableResult + 1 );
|
|---|
| 475 | cost.incSign( signMatrix[ BasicType::SignedInt ][ destAsBasic->kind ] );
|
|---|
| 476 | } // if
|
|---|
| 477 | } else if ( dynamic_cast< const PointerType * >( dest ) ) {
|
|---|
| 478 | cost = Cost::zero;
|
|---|
| 479 | cost.incSafe( maxIntCost + 2 ); // +1 for zero_t -> int, +1 for disambiguation
|
|---|
| 480 | } // if
|
|---|
| 481 | }
|
|---|
| 482 |
|
|---|
| 483 | void ConversionCost::postvisit( const OneType * ) {
|
|---|
| 484 | if ( dynamic_cast< const OneType * >( dest ) ) {
|
|---|
| 485 | cost = Cost::zero;
|
|---|
| 486 | } else if ( const BasicType * destAsBasic = dynamic_cast< const BasicType * >( dest ) ) {
|
|---|
| 487 | // copied from visit(BasicType *) for signed int, but +1 for safe conversions
|
|---|
| 488 | int tableResult = costMatrix[ BasicType::SignedInt ][ destAsBasic->kind ];
|
|---|
| 489 | if ( tableResult == -1 ) {
|
|---|
| 490 | cost = Cost::unsafe;
|
|---|
| 491 | } else {
|
|---|
| 492 | cost = Cost::zero;
|
|---|
| 493 | cost.incSafe( tableResult + 1 );
|
|---|
| 494 | cost.incSign( signMatrix[ BasicType::SignedInt ][ destAsBasic->kind ] );
|
|---|
| 495 | } // if
|
|---|
| 496 | } // if
|
|---|
| 497 | }
|
|---|
| 498 |
|
|---|
| 499 | static int localPtrsAssignable(const ast::Type * t1, const ast::Type * t2,
|
|---|
| 500 | const ast::SymbolTable &, const ast::TypeEnvironment & env ) {
|
|---|
| 501 | return ptrsAssignable( t1, t2, env );
|
|---|
| 502 | }
|
|---|
| 503 |
|
|---|
| 504 | // TODO: This is used for overload resolution. It might be able to be dropped once the old system
|
|---|
| 505 | // is removed.
|
|---|
| 506 | static Cost localConversionCost(
|
|---|
| 507 | const ast::Type * src, const ast::Type * dst, const ast::SymbolTable & symtab,
|
|---|
| 508 | const ast::TypeEnvironment & env
|
|---|
| 509 | ) { return conversionCost( src, dst, symtab, env ); }
|
|---|
| 510 |
|
|---|
| 511 | Cost conversionCost(
|
|---|
| 512 | const ast::Type * src, const ast::Type * dst, const ast::SymbolTable & symtab,
|
|---|
| 513 | const ast::TypeEnvironment & env
|
|---|
| 514 | ) {
|
|---|
| 515 | if ( const ast::TypeInstType * inst = dynamic_cast< const ast::TypeInstType * >( dst ) ) {
|
|---|
| 516 | if ( const ast::EqvClass * eqv = env.lookup( inst->name ) ) {
|
|---|
| 517 | if ( eqv->bound ) {
|
|---|
| 518 | return conversionCost(src, eqv->bound, symtab, env );
|
|---|
| 519 | } else {
|
|---|
| 520 | return Cost::infinity;
|
|---|
| 521 | }
|
|---|
| 522 | } else if ( const ast::NamedTypeDecl * named = symtab.lookupType( inst->name ) ) {
|
|---|
| 523 | const ast::TypeDecl * type = dynamic_cast< const ast::TypeDecl * >( named );
|
|---|
| 524 | assertf( type, "Unexpected typedef." );
|
|---|
| 525 | if ( type->base ) {
|
|---|
| 526 | return conversionCost( src, type->base, symtab, env ) + Cost::safe;
|
|---|
| 527 | }
|
|---|
| 528 | }
|
|---|
| 529 | }
|
|---|
| 530 | if ( typesCompatibleIgnoreQualifiers( src, dst, symtab, env ) ) {
|
|---|
| 531 | return Cost::zero;
|
|---|
| 532 | } else if ( dynamic_cast< const ast::VoidType * >( dst ) ) {
|
|---|
| 533 | return Cost::safe;
|
|---|
| 534 | } else if ( const ast::ReferenceType * refType =
|
|---|
| 535 | dynamic_cast< const ast::ReferenceType * >( dst ) ) {
|
|---|
| 536 | return convertToReferenceCost( src, refType, symtab, env, localPtrsAssignable );
|
|---|
| 537 | } else {
|
|---|
| 538 | ast::Pass<ConversionCost_new> converter( dst, symtab, env, localConversionCost );
|
|---|
| 539 | src->accept( converter );
|
|---|
| 540 | return converter.pass.cost;
|
|---|
| 541 | }
|
|---|
| 542 | }
|
|---|
| 543 |
|
|---|
| 544 | static Cost convertToReferenceCost( const ast::Type * src, const ast::Type * dst,
|
|---|
| 545 | int diff, const ast::SymbolTable & symtab, const ast::TypeEnvironment & env,
|
|---|
| 546 | NumCostCalculation func ) {
|
|---|
| 547 | if ( 0 < diff ) {
|
|---|
| 548 | Cost cost = convertToReferenceCost(
|
|---|
| 549 | strict_dynamic_cast< const ast::ReferenceType * >( src )->base,
|
|---|
| 550 | dst, (diff - 1), symtab, env, func );
|
|---|
| 551 | cost.incReference();
|
|---|
| 552 | return cost;
|
|---|
| 553 | } else if ( diff < -1 ) {
|
|---|
| 554 | Cost cost = convertToReferenceCost(
|
|---|
| 555 | src, strict_dynamic_cast< const ast::ReferenceType * >( dst )->base,
|
|---|
| 556 | (diff + 1), symtab, env, func );
|
|---|
| 557 | cost.incReference();
|
|---|
| 558 | return cost;
|
|---|
| 559 | } else if ( 0 == diff ) {
|
|---|
| 560 | const ast::ReferenceType * srcAsRef = dynamic_cast< const ast::ReferenceType * >( src );
|
|---|
| 561 | const ast::ReferenceType * dstAsRef = dynamic_cast< const ast::ReferenceType * >( dst );
|
|---|
| 562 | if ( srcAsRef && dstAsRef ) {
|
|---|
| 563 | ast::CV::Qualifiers tq1 = srcAsRef->base->qualifiers;
|
|---|
| 564 | ast::CV::Qualifiers tq2 = dstAsRef->base->qualifiers;
|
|---|
| 565 | if ( tq1 <= tq2 && typesCompatibleIgnoreQualifiers(
|
|---|
| 566 | srcAsRef->base, dstAsRef->base, symtab, env ) ) {
|
|---|
| 567 | if ( tq1 == tq2 ) {
|
|---|
| 568 | return Cost::zero;
|
|---|
| 569 | } else {
|
|---|
| 570 | return Cost::safe;
|
|---|
| 571 | }
|
|---|
| 572 | } else {
|
|---|
| 573 | int assignResult = func( srcAsRef->base, dstAsRef->base, symtab, env );
|
|---|
| 574 | if ( 0 < assignResult ) {
|
|---|
| 575 | return Cost::safe;
|
|---|
| 576 | } else if ( assignResult < 0 ) {
|
|---|
| 577 | return Cost::unsafe;
|
|---|
| 578 | }
|
|---|
| 579 | }
|
|---|
| 580 | } else {
|
|---|
| 581 | ast::Pass<ConversionCost_new> converter( dst, symtab, env, localConversionCost );
|
|---|
| 582 | src->accept( converter );
|
|---|
| 583 | return converter.pass.cost;
|
|---|
| 584 | }
|
|---|
| 585 | } else {
|
|---|
| 586 | assert( -1 == diff );
|
|---|
| 587 | const ast::ReferenceType * dstAsRef = dynamic_cast< const ast::ReferenceType * >( dst );
|
|---|
| 588 | assert( dstAsRef );
|
|---|
| 589 | if ( typesCompatibleIgnoreQualifiers( src, dstAsRef->base, symtab, env ) ) {
|
|---|
| 590 | if ( src->is_lvalue() ) {
|
|---|
| 591 | if ( src->qualifiers == dstAsRef->base->qualifiers ) {
|
|---|
| 592 | return Cost::reference;
|
|---|
| 593 | } else if ( src->qualifiers < dstAsRef->base->qualifiers ) {
|
|---|
| 594 | return Cost::safe;
|
|---|
| 595 | } else {
|
|---|
| 596 | return Cost::unsafe;
|
|---|
| 597 | }
|
|---|
| 598 | } else if ( dstAsRef->base->is_const() ) {
|
|---|
| 599 | return Cost::safe;
|
|---|
| 600 | } else {
|
|---|
| 601 | return Cost::unsafe;
|
|---|
| 602 | }
|
|---|
| 603 | }
|
|---|
| 604 | }
|
|---|
| 605 | return Cost::infinity;
|
|---|
| 606 | }
|
|---|
| 607 |
|
|---|
| 608 | Cost convertToReferenceCost( const ast::Type * src, const ast::ReferenceType * dst,
|
|---|
| 609 | const ast::SymbolTable & symtab, const ast::TypeEnvironment & env,
|
|---|
| 610 | NumCostCalculation func ) {
|
|---|
| 611 | int sdepth = src->referenceDepth(), ddepth = dst->referenceDepth();
|
|---|
| 612 | return convertToReferenceCost( src, dst, sdepth - ddepth, symtab, env, func );
|
|---|
| 613 | }
|
|---|
| 614 |
|
|---|
| 615 | void ConversionCost_new::postvisit( const ast::VoidType * voidType ) {
|
|---|
| 616 | (void)voidType;
|
|---|
| 617 | cost = Cost::infinity;
|
|---|
| 618 | }
|
|---|
| 619 |
|
|---|
| 620 | void ConversionCost_new::postvisit( const ast::BasicType * basicType ) {
|
|---|
| 621 | if ( const ast::BasicType * dstAsBasic = dynamic_cast< const ast::BasicType * >( dst ) ) {
|
|---|
| 622 | int tableResult = costMatrix[ basicType->kind ][ dstAsBasic->kind ];
|
|---|
| 623 | if ( tableResult == -1 ) {
|
|---|
| 624 | cost = Cost::unsafe;
|
|---|
| 625 | } else {
|
|---|
| 626 | cost = Cost::zero;
|
|---|
| 627 | cost.incSafe( tableResult );
|
|---|
| 628 | cost.incSign( signMatrix[ basicType->kind ][ dstAsBasic->kind ] );
|
|---|
| 629 | }
|
|---|
| 630 | } else if ( dynamic_cast< const ast::EnumInstType * >( dst ) ) {
|
|---|
| 631 | // xxx - not positive this is correct, but appears to allow casting int => enum
|
|---|
| 632 | cost = Cost::unsafe;
|
|---|
| 633 | }
|
|---|
| 634 | }
|
|---|
| 635 |
|
|---|
| 636 | void ConversionCost_new::postvisit( const ast::PointerType * pointerType ) {
|
|---|
| 637 | if ( const ast::PointerType * dstAsPtr = dynamic_cast< const ast::PointerType * >( dst ) ) {
|
|---|
| 638 | ast::CV::Qualifiers tq1 = pointerType->base->qualifiers;
|
|---|
| 639 | ast::CV::Qualifiers tq2 = dstAsPtr->base->qualifiers;
|
|---|
| 640 | if ( tq1 <= tq2 && typesCompatibleIgnoreQualifiers(
|
|---|
| 641 | pointerType->base, dstAsPtr->base, symtab, env ) ) {
|
|---|
| 642 | if ( tq1 == tq2 ) {
|
|---|
| 643 | cost = Cost::zero;
|
|---|
| 644 | } else {
|
|---|
| 645 | cost = Cost::safe;
|
|---|
| 646 | }
|
|---|
| 647 | } else {
|
|---|
| 648 | int assignResult = ptrsAssignable( pointerType->base, dstAsPtr->base, env );
|
|---|
| 649 | if ( 0 < assignResult && tq1 <= tq2 ) {
|
|---|
| 650 | if ( tq1 == tq2 ) {
|
|---|
| 651 | cost = Cost::safe;
|
|---|
| 652 | } else {
|
|---|
| 653 | cost = Cost::safe + Cost::safe;
|
|---|
| 654 | }
|
|---|
| 655 | } else if ( assignResult < 0 ) {
|
|---|
| 656 | cost = Cost::unsafe;
|
|---|
| 657 | } // else Cost::infinity
|
|---|
| 658 | }
|
|---|
| 659 | }
|
|---|
| 660 | }
|
|---|
| 661 |
|
|---|
| 662 | void ConversionCost_new::postvisit( const ast::ArrayType * arrayType ) {
|
|---|
| 663 | (void)arrayType;
|
|---|
| 664 | }
|
|---|
| 665 |
|
|---|
| 666 | void ConversionCost_new::postvisit( const ast::ReferenceType * refType ) {
|
|---|
| 667 | assert( nullptr == dynamic_cast< const ast::ReferenceType * >( dst ) );
|
|---|
| 668 |
|
|---|
| 669 | cost = costCalc( refType->base, dst, symtab, env );
|
|---|
| 670 | if ( refType->base->qualifiers == dst->qualifiers ) {
|
|---|
| 671 | cost.incReference();
|
|---|
| 672 | } else if ( refType->base->qualifiers < dst->qualifiers ) {
|
|---|
| 673 | cost.incSafe();
|
|---|
| 674 | } else {
|
|---|
| 675 | cost.incUnsafe();
|
|---|
| 676 | }
|
|---|
| 677 | }
|
|---|
| 678 |
|
|---|
| 679 | void ConversionCost_new::postvisit( const ast::FunctionType * functionType ) {
|
|---|
| 680 | (void)functionType;
|
|---|
| 681 | }
|
|---|
| 682 |
|
|---|
| 683 | void ConversionCost_new::postvisit( const ast::StructInstType * structInstType ) {
|
|---|
| 684 | if ( const ast::StructInstType * dstAsInst =
|
|---|
| 685 | dynamic_cast< const ast::StructInstType * >( dst ) ) {
|
|---|
| 686 | if ( structInstType->name == dstAsInst->name ) {
|
|---|
| 687 | cost = Cost::zero;
|
|---|
| 688 | }
|
|---|
| 689 | }
|
|---|
| 690 | }
|
|---|
| 691 |
|
|---|
| 692 | void ConversionCost_new::postvisit( const ast::UnionInstType * unionInstType ) {
|
|---|
| 693 | if ( const ast::UnionInstType * dstAsInst =
|
|---|
| 694 | dynamic_cast< const ast::UnionInstType * >( dst ) ) {
|
|---|
| 695 | if ( unionInstType->name == dstAsInst->name ) {
|
|---|
| 696 | cost = Cost::zero;
|
|---|
| 697 | }
|
|---|
| 698 | }
|
|---|
| 699 | }
|
|---|
| 700 |
|
|---|
| 701 | void ConversionCost_new::postvisit( const ast::EnumInstType * enumInstType ) {
|
|---|
| 702 | (void)enumInstType;
|
|---|
| 703 | static const ast::BasicType integer( ast::BasicType::SignedInt );
|
|---|
| 704 | cost = costCalc( &integer, dst, symtab, env );
|
|---|
| 705 | if ( cost < Cost::unsafe ) {
|
|---|
| 706 | cost.incSafe();
|
|---|
| 707 | }
|
|---|
| 708 | }
|
|---|
| 709 |
|
|---|
| 710 | void ConversionCost_new::postvisit( const ast::TraitInstType * traitInstType ) {
|
|---|
| 711 | (void)traitInstType;
|
|---|
| 712 | }
|
|---|
| 713 |
|
|---|
| 714 | void ConversionCost_new::postvisit( const ast::TypeInstType * typeInstType ) {
|
|---|
| 715 | if ( const ast::EqvClass * eqv = env.lookup( typeInstType->name ) ) {
|
|---|
| 716 | cost = costCalc( eqv->bound, dst, symtab, env );
|
|---|
| 717 | } else if ( const ast::TypeInstType * dstAsInst =
|
|---|
| 718 | dynamic_cast< const ast::TypeInstType * >( dst ) ) {
|
|---|
| 719 | if ( typeInstType->name == dstAsInst->name ) {
|
|---|
| 720 | cost = Cost::zero;
|
|---|
| 721 | }
|
|---|
| 722 | } else if ( const ast::NamedTypeDecl * namedType = symtab.lookupType( typeInstType->name ) ) {
|
|---|
| 723 | const ast::TypeDecl * type = dynamic_cast< const ast::TypeDecl * >( namedType );
|
|---|
| 724 | assertf( type, "Unexpected typedef.");
|
|---|
| 725 | if ( type->base ) {
|
|---|
| 726 | cost = costCalc( type->base, dst, symtab, env ) + Cost::safe;
|
|---|
| 727 | }
|
|---|
| 728 | }
|
|---|
| 729 | }
|
|---|
| 730 |
|
|---|
| 731 | void ConversionCost_new::postvisit( const ast::TupleType * tupleType ) {
|
|---|
| 732 | Cost c = Cost::zero;
|
|---|
| 733 | if ( const ast::TupleType * dstAsTuple = dynamic_cast< const ast::TupleType * >( dst ) ) {
|
|---|
| 734 | auto srcIt = tupleType->types.begin();
|
|---|
| 735 | auto dstIt = dstAsTuple->types.begin();
|
|---|
| 736 | auto srcEnd = tupleType->types.end();
|
|---|
| 737 | auto dstEnd = dstAsTuple->types.end();
|
|---|
| 738 | while ( srcIt != srcEnd && dstIt != dstEnd ) {
|
|---|
| 739 | Cost newCost = costCalc( * srcIt++, * dstIt++, symtab, env );
|
|---|
| 740 | if ( newCost == Cost::infinity ) {
|
|---|
| 741 | return;
|
|---|
| 742 | }
|
|---|
| 743 | c += newCost;
|
|---|
| 744 | }
|
|---|
| 745 | if ( dstIt != dstEnd ) {
|
|---|
| 746 | cost = Cost::infinity;
|
|---|
| 747 | } else {
|
|---|
| 748 | cost = c;
|
|---|
| 749 | }
|
|---|
| 750 | }
|
|---|
| 751 | }
|
|---|
| 752 |
|
|---|
| 753 | void ConversionCost_new::postvisit( const ast::VarArgsType * varArgsType ) {
|
|---|
| 754 | (void)varArgsType;
|
|---|
| 755 | if ( dynamic_cast< const ast::VarArgsType * >( dst ) ) {
|
|---|
| 756 | cost = Cost::zero;
|
|---|
| 757 | }
|
|---|
| 758 | }
|
|---|
| 759 |
|
|---|
| 760 | void ConversionCost_new::postvisit( const ast::ZeroType * zeroType ) {
|
|---|
| 761 | (void)zeroType;
|
|---|
| 762 | if ( dynamic_cast< const ast::ZeroType * >( dst ) ) {
|
|---|
| 763 | cost = Cost::zero;
|
|---|
| 764 | } else if ( const ast::BasicType * dstAsBasic =
|
|---|
| 765 | dynamic_cast< const ast::BasicType * >( dst ) ) {
|
|---|
| 766 | int tableResult = costMatrix[ ast::BasicType::SignedInt ][ dstAsBasic->kind ];
|
|---|
| 767 | if ( -1 == tableResult ) {
|
|---|
| 768 | cost = Cost::unsafe;
|
|---|
| 769 | } else {
|
|---|
| 770 | cost = Cost::zero;
|
|---|
| 771 | cost.incSafe( tableResult + 1 );
|
|---|
| 772 | cost.incSign( signMatrix[ ast::BasicType::SignedInt ][ dstAsBasic->kind ] );
|
|---|
| 773 | }
|
|---|
| 774 | }
|
|---|
| 775 | }
|
|---|
| 776 |
|
|---|
| 777 | void ConversionCost_new::postvisit( const ast::OneType * oneType ) {
|
|---|
| 778 | (void)oneType;
|
|---|
| 779 | if ( dynamic_cast< const ast::OneType * >( dst ) ) {
|
|---|
| 780 | cost = Cost::zero;
|
|---|
| 781 | } else if ( const ast::BasicType * dstAsBasic =
|
|---|
| 782 | dynamic_cast< const ast::BasicType * >( dst ) ) {
|
|---|
| 783 | int tableResult = costMatrix[ ast::BasicType::SignedInt ][ dstAsBasic->kind ];
|
|---|
| 784 | if ( -1 == tableResult ) {
|
|---|
| 785 | cost = Cost::unsafe;
|
|---|
| 786 | } else {
|
|---|
| 787 | cost = Cost::zero;
|
|---|
| 788 | cost.incSafe( tableResult + 1 );
|
|---|
| 789 | cost.incSign( signMatrix[ ast::BasicType::SignedInt ][ dstAsBasic->kind ] );
|
|---|
| 790 | }
|
|---|
| 791 | } else if ( dynamic_cast< const ast::PointerType * >( dst ) ) {
|
|---|
| 792 | cost = Cost::zero;
|
|---|
| 793 | cost.incSafe( maxIntCost + 2 );
|
|---|
| 794 | }
|
|---|
| 795 | }
|
|---|
| 796 |
|
|---|
| 797 |
|
|---|
| 798 | } // namespace ResolvExpr
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| 799 |
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| 800 | // Local Variables: //
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| 801 | // tab-width: 4 //
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| 802 | // mode: c++ //
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| 803 | // compile-command: "make install" //
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| 804 | // End: //
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