| 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 : Peter A. Buhr
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| 12 | // Last Modified On : Thu Feb 14 17:04:31 2019
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| 13 | // Update Count : 23
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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 | const Cost Cost::zero = Cost{ 0, 0, 0, 0, 0, 0, 0 };
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| 31 | const Cost Cost::infinity = Cost{ -1, -1, -1, -1, -1, 1, -1 };
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| 32 | const Cost Cost::unsafe = Cost{ 1, 0, 0, 0, 0, 0, 0 };
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| 33 | const Cost Cost::poly = Cost{ 0, 1, 0, 0, 0, 0, 0 };
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| 34 | const Cost Cost::safe = Cost{ 0, 0, 1, 0, 0, 0, 0 };
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| 35 | const Cost Cost::sign = Cost{ 0, 0, 0, 1, 0, 0, 0 };
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| 36 | const Cost Cost::var = Cost{ 0, 0, 0, 0, 1, 0, 0 };
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| 37 | const Cost Cost::spec = Cost{ 0, 0, 0, 0, 0, -1, 0 };
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| 38 | const Cost Cost::reference = Cost{ 0, 0, 0, 0, 0, 0, 1 };
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| 39 |
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| 40 | #if 0
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| 41 | #define PRINT(x) x
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| 42 | #else
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| 43 | #define PRINT(x)
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| 44 | #endif
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| 45 |
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| 46 | Cost conversionCost( Type *src, Type *dest, const SymTab::Indexer &indexer, const TypeEnvironment &env ) {
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| 47 | if ( TypeInstType *destAsTypeInst = dynamic_cast< TypeInstType* >( dest ) ) {
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| 48 | PRINT( std::cerr << "type inst " << destAsTypeInst->name; )
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| 49 | if ( const EqvClass* eqvClass = env.lookup( destAsTypeInst->name ) ) {
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| 50 | if ( eqvClass->type ) {
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| 51 | return conversionCost( src, eqvClass->type, indexer, env );
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| 52 | } else {
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| 53 | return Cost::infinity;
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| 54 | }
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| 55 | } else if ( NamedTypeDecl *namedType = indexer.lookupType( destAsTypeInst->name ) ) {
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| 56 | PRINT( std::cerr << " found" << std::endl; )
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| 57 | TypeDecl *type = dynamic_cast< TypeDecl* >( namedType );
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| 58 | // all typedefs should be gone by this point
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| 59 | assert( type );
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| 60 | if ( type->base ) {
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| 61 | return conversionCost( src, type->base, indexer, env ) + Cost::safe;
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| 62 | } // if
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| 63 | } // if
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| 64 | PRINT( std::cerr << " not found" << std::endl; )
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| 65 | } // if
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| 66 | PRINT(
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| 67 | std::cerr << "src is ";
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| 68 | src->print( std::cerr );
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| 69 | std::cerr << std::endl << "dest is ";
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| 70 | dest->print( std::cerr );
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| 71 | std::cerr << std::endl << "env is" << std::endl;
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| 72 | env.print( std::cerr, 8 );
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| 73 | )
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| 74 | if ( typesCompatibleIgnoreQualifiers( src, dest, indexer, env ) ) {
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| 75 | PRINT( std::cerr << "compatible!" << std::endl; )
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| 76 | return Cost::zero;
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| 77 | } else if ( dynamic_cast< VoidType* >( dest ) ) {
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| 78 | return Cost::safe;
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| 79 | } else if ( ReferenceType * refType = dynamic_cast< ReferenceType * > ( dest ) ) {
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| 80 | PRINT( std::cerr << "conversionCost: dest is reference" << std::endl; )
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| 81 | return convertToReferenceCost( src, refType, indexer, env, [](Type * t1, Type * t2, const SymTab::Indexer &, const TypeEnvironment & env ){
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| 82 | return ptrsAssignable( t1, t2, env );
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| 83 | });
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| 84 | } else {
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| 85 | PassVisitor<ConversionCost> converter( dest, indexer, env, conversionCost );
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| 86 | src->accept( converter );
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| 87 | if ( converter.pass.get_cost() == Cost::infinity ) {
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| 88 | return Cost::infinity;
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| 89 | } else {
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| 90 | return converter.pass.get_cost() + Cost::zero;
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| 91 | } // if
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| 92 | } // if
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| 93 | }
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| 94 |
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| 95 | Cost convertToReferenceCost( Type * src, Type * dest, int diff, const SymTab::Indexer & indexer, const TypeEnvironment & env, PtrsFunction func ) {
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| 96 | PRINT( std::cerr << "convert to reference cost... diff " << diff << " " << src << " / " << dest << std::endl; )
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| 97 | if ( diff > 0 ) {
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| 98 | // TODO: document this
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| 99 | Cost cost = convertToReferenceCost( strict_dynamic_cast< ReferenceType * >( src )->base, dest, diff-1, indexer, env, func );
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| 100 | cost.incReference();
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| 101 | return cost;
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| 102 | } else if ( diff < -1 ) {
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| 103 | // TODO: document this
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| 104 | Cost cost = convertToReferenceCost( src, strict_dynamic_cast< ReferenceType * >( dest )->base, diff+1, indexer, env, func );
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| 105 | cost.incReference();
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| 106 | return cost;
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| 107 | } else if ( diff == 0 ) {
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| 108 | ReferenceType * srcAsRef = dynamic_cast< ReferenceType * >( src );
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| 109 | ReferenceType * destAsRef = dynamic_cast< ReferenceType * >( dest );
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| 110 | if ( srcAsRef && destAsRef ) { // pointer-like conversions between references
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| 111 | PRINT( std::cerr << "converting between references" << std::endl; )
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| 112 | Type::Qualifiers tq1 = srcAsRef->base->get_qualifiers();
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| 113 | Type::Qualifiers tq2 = destAsRef->base->get_qualifiers();
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| 114 | if ( tq1 <= tq2 && typesCompatibleIgnoreQualifiers( srcAsRef->base, destAsRef->base, indexer, env ) ) {
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| 115 | PRINT( std::cerr << " :: compatible and good qualifiers" << std::endl; )
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| 116 | if ( tq1 == tq2 ) {
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| 117 | // types are the same
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| 118 | return Cost::zero;
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| 119 | } else {
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| 120 | // types are the same, except otherPointer has more qualifiers
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| 121 | return Cost::safe;
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| 122 | }
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| 123 | } else { // xxx - this discards reference qualifiers from consideration -- reducing qualifiers is a safe conversion; is this right?
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| 124 | int assignResult = func( srcAsRef->base, destAsRef->base, indexer, env );
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| 125 | PRINT( std::cerr << "comparing references: " << assignResult << " " << srcAsRef << " " << destAsRef << std::endl; )
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| 126 | if ( assignResult > 0 ) {
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| 127 | return Cost::safe;
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| 128 | } else if ( assignResult < 0 ) {
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| 129 | return Cost::unsafe;
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| 130 | } // if
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| 131 | } // if
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| 132 | } else {
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| 133 | PRINT( std::cerr << "reference to rvalue conversion" << std::endl; )
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| 134 | PassVisitor<ConversionCost> converter( dest, indexer, env, conversionCost );
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| 135 | src->accept( converter );
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| 136 | return converter.pass.get_cost();
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| 137 | } // if
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| 138 | } else {
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| 139 | ReferenceType * destAsRef = dynamic_cast< ReferenceType * >( dest );
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| 140 | assert( diff == -1 && destAsRef );
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| 141 | PRINT( std::cerr << "dest is: " << dest << " / src is: " << src << std::endl; )
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| 142 | if ( typesCompatibleIgnoreQualifiers( src, destAsRef->base, indexer, env ) ) {
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| 143 | PRINT( std::cerr << "converting compatible base type" << std::endl; )
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| 144 | if ( src->get_lvalue() ) {
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| 145 | PRINT(
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| 146 | std::cerr << "lvalue to reference conversion" << std::endl;
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| 147 | std::cerr << src << " => " << destAsRef << std::endl;
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| 148 | )
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| 149 | // lvalue-to-reference conversion: cv lvalue T => cv T &
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| 150 | if ( src->get_qualifiers() == destAsRef->base->get_qualifiers() ) {
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| 151 | return Cost::reference; // cost needs to be non-zero to add cast
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| 152 | } if ( src->get_qualifiers() < destAsRef->base->get_qualifiers() ) {
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| 153 | return Cost::safe; // cost needs to be higher than previous cast to differentiate adding qualifiers vs. keeping same
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| 154 | } else {
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| 155 | return Cost::unsafe;
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| 156 | } // if
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| 157 | } else if ( destAsRef->base->get_const() ) {
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| 158 | PRINT( std::cerr << "rvalue to const ref conversion" << std::endl; )
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| 159 | // rvalue-to-const-reference conversion: T => const T &
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| 160 | return Cost::safe;
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| 161 | } else {
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| 162 | PRINT( std::cerr << "rvalue to non-const reference conversion" << std::endl; )
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| 163 | // rvalue-to-reference conversion: T => T &
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| 164 | return Cost::unsafe;
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| 165 | } // if
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| 166 | } // if
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| 167 | PRINT( std::cerr << "attempting to convert from incompatible base type -- fail" << std::endl; )
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| 168 | }
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| 169 | return Cost::infinity;
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| 170 | }
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| 171 |
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| 172 | Cost convertToReferenceCost( Type * src, ReferenceType * dest, const SymTab::Indexer & indexer, const TypeEnvironment & env, PtrsFunction func ) {
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| 173 | int sdepth = src->referenceDepth(), ddepth = dest->referenceDepth();
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| 174 | Cost cost = convertToReferenceCost( src, dest, sdepth-ddepth, indexer, env, func );
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| 175 | PRINT( std::cerr << "convertToReferenceCost result: " << cost << std::endl; )
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| 176 | return cost;
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| 177 | }
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| 178 |
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| 179 | ConversionCost::ConversionCost( Type *dest, const SymTab::Indexer &indexer, const TypeEnvironment &env, CostFunction costFunc )
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| 180 | : dest( dest ), indexer( indexer ), cost( Cost::infinity ), env( env ), costFunc( costFunc ) {
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| 181 | }
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| 182 |
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| 183 | // GENERATED START, DO NOT EDIT
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| 184 | // GENERATED BY BasicTypes-gen.cc
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| 185 | /* EXTENDED INTEGRAL RANK HIERARCHY (root to leaves)
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| 186 | _Bool
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| 187 | char signed char unsigned char
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| 188 | signed short int unsigned short int
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| 189 | signed int unsigned int
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| 190 | signed long int unsigned long int
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| 191 | signed long long int unsigned long long int
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| 192 | __int128 unsigned __int128
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| 193 | _Float16 _Float16 _Complex
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| 194 | _Float32 _Float32 _Complex
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| 195 | float float _Complex
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| 196 | _Float32x _Float32x _Complex
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| 197 | _Float64 _Float64 _Complex
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| 198 | double double _Complex
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| 199 | _Float64x _Float64x _Complex
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| 200 | __float80
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| 201 | _Float128 _Float128 _Complex
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| 202 | __float128
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| 203 | long double long double _Complex
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| 204 | _Float128x _Float128x _Complex
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| 205 | */
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| 206 | // GENERATED END
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| 207 |
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| 208 | // GENERATED START, DO NOT EDIT
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| 209 | // GENERATED BY BasicTypes-gen.cc
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| 210 | static const int costMatrix[BasicType::NUMBER_OF_BASIC_TYPES][BasicType::NUMBER_OF_BASIC_TYPES] = { // path length from root to node
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| 211 | /* 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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| 212 | /* 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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| 213 | /* 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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| 214 | /* 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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| 215 | /* 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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| 216 | /* 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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| 217 | /* 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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| 218 | /* 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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| 219 | /* 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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| 220 | /* 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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| 221 | /* 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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| 222 | /* 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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| 223 | /* 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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| 224 | /* 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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| 225 | /* 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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| 226 | /* _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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| 227 | /* _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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| 228 | /* _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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| 229 | /* _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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| 230 | /* 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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| 231 | /* 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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| 232 | /* _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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| 233 | /* _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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| 234 | /* 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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| 235 | /* _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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| 236 | /* 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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| 237 | /* 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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| 238 | /* 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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| 239 | /* _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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| 240 | /* 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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| 241 | /* _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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|---|
| 242 | /* _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, },
|
|---|
| 243 | /* 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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|---|
| 244 | /* 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, },
|
|---|
| 245 | /* 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, },
|
|---|
| 246 | /* _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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|---|
| 247 | /*_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, },
|
|---|
| 248 | }; // costMatrix
|
|---|
| 249 | // GENERATED END
|
|---|
| 250 | static_assert(
|
|---|
| 251 | sizeof(costMatrix)/sizeof(costMatrix[0][0]) == BasicType::NUMBER_OF_BASIC_TYPES*BasicType::NUMBER_OF_BASIC_TYPES,
|
|---|
| 252 | "Missing row in the cost matrix"
|
|---|
| 253 | );
|
|---|
| 254 |
|
|---|
| 255 | // GENERATED START, DO NOT EDIT
|
|---|
| 256 | // GENERATED BY BasicTypes-gen.cc
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|---|
| 257 | 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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|---|
| 258 | /* 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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|---|
| 259 | /* 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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|---|
| 260 | /* 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, },
|
|---|
| 261 | /* 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, },
|
|---|
| 262 | /* 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, },
|
|---|
| 263 | /* 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, },
|
|---|
| 264 | /* 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, },
|
|---|
| 265 | /* 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, },
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|---|
| 266 | /* 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, },
|
|---|
| 267 | /* 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, },
|
|---|
| 268 | /* 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, },
|
|---|
| 269 | /* 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, },
|
|---|
| 270 | /* 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, },
|
|---|
| 271 | /* 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, },
|
|---|
| 272 | /* 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, },
|
|---|
| 273 | /* _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, },
|
|---|
| 274 | /* _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, },
|
|---|
| 275 | /* _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, },
|
|---|
| 276 | /* _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, },
|
|---|
| 277 | /* 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, },
|
|---|
| 278 | /* 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, },
|
|---|
| 279 | /* _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, },
|
|---|
| 280 | /* _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, },
|
|---|
| 281 | /* 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, },
|
|---|
| 282 | /* _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, },
|
|---|
| 283 | /* 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, },
|
|---|
| 284 | /* 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, },
|
|---|
| 285 | /* 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, },
|
|---|
| 286 | /* _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, },
|
|---|
| 287 | /* 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, },
|
|---|
| 288 | /* _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, },
|
|---|
| 289 | /* _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, },
|
|---|
| 290 | /* 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, },
|
|---|
| 291 | /* 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, },
|
|---|
| 292 | /* 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, },
|
|---|
| 293 | /* _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, },
|
|---|
| 294 | /*_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, },
|
|---|
| 295 | }; // signMatrix
|
|---|
| 296 | // GENERATED END
|
|---|
| 297 | static_assert(
|
|---|
| 298 | sizeof(signMatrix)/sizeof(signMatrix[0][0]) == BasicType::NUMBER_OF_BASIC_TYPES*BasicType::NUMBER_OF_BASIC_TYPES,
|
|---|
| 299 | "Missing row in the sign matrix"
|
|---|
| 300 | );
|
|---|
| 301 |
|
|---|
| 302 | void ConversionCost::postvisit( VoidType * ) {
|
|---|
| 303 | cost = Cost::infinity;
|
|---|
| 304 | }
|
|---|
| 305 |
|
|---|
| 306 | void ConversionCost::postvisit(BasicType *basicType) {
|
|---|
| 307 | if ( BasicType *destAsBasic = dynamic_cast< BasicType* >( dest ) ) {
|
|---|
| 308 | int tableResult = costMatrix[ basicType->get_kind() ][ destAsBasic->get_kind() ];
|
|---|
| 309 | if ( tableResult == -1 ) {
|
|---|
| 310 | cost = Cost::unsafe;
|
|---|
| 311 | } else {
|
|---|
| 312 | cost = Cost::zero;
|
|---|
| 313 | cost.incSafe( tableResult );
|
|---|
| 314 | cost.incSign( signMatrix[ basicType->get_kind() ][ destAsBasic->get_kind() ] );
|
|---|
| 315 | } // if
|
|---|
| 316 | } else if ( dynamic_cast< EnumInstType *>( dest ) ) {
|
|---|
| 317 | // xxx - not positive this is correct, but appears to allow casting int => enum
|
|---|
| 318 | cost = Cost::unsafe;
|
|---|
| 319 | } // if
|
|---|
| 320 | // no cases for zero_t/one_t because it should not be possible to convert int, etc. to zero_t/one_t.
|
|---|
| 321 | }
|
|---|
| 322 |
|
|---|
| 323 | void ConversionCost::postvisit( PointerType * pointerType ) {
|
|---|
| 324 | if ( PointerType *destAsPtr = dynamic_cast< PointerType* >( dest ) ) {
|
|---|
| 325 | PRINT( std::cerr << pointerType << " ===> " << destAsPtr << std::endl; )
|
|---|
| 326 | Type::Qualifiers tq1 = pointerType->base->get_qualifiers();
|
|---|
| 327 | Type::Qualifiers tq2 = destAsPtr->base->get_qualifiers();
|
|---|
| 328 | if ( tq1 <= tq2 && typesCompatibleIgnoreQualifiers( pointerType->base, destAsPtr->base, indexer, env ) ) {
|
|---|
| 329 | PRINT( std::cerr << " :: compatible and good qualifiers" << std::endl; )
|
|---|
| 330 | if ( tq1 == tq2 ) {
|
|---|
| 331 | // types are the same
|
|---|
| 332 | cost = Cost::zero;
|
|---|
| 333 | } else {
|
|---|
| 334 | // types are the same, except otherPointer has more qualifiers
|
|---|
| 335 | cost = Cost::safe;
|
|---|
| 336 | } // if
|
|---|
| 337 | } else {
|
|---|
| 338 | int assignResult = ptrsAssignable( pointerType->base, destAsPtr->base, env );
|
|---|
| 339 | PRINT( std::cerr << " :: " << assignResult << std::endl; )
|
|---|
| 340 | if ( assignResult > 0 && tq1 <= tq2 ) {
|
|---|
| 341 | // 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?
|
|---|
| 342 | if ( tq1 == tq2 ) {
|
|---|
| 343 | cost = Cost::safe;
|
|---|
| 344 | } else if ( tq1 < tq2 ) {
|
|---|
| 345 | cost = Cost::safe+Cost::safe;
|
|---|
| 346 | }
|
|---|
| 347 | } else if ( assignResult < 0 ) {
|
|---|
| 348 | cost = Cost::unsafe;
|
|---|
| 349 | } // if
|
|---|
| 350 | // assignResult == 0 means Cost::Infinity
|
|---|
| 351 | } // if
|
|---|
| 352 | // case case for zero_t because it should not be possible to convert pointers to zero_t.
|
|---|
| 353 | } // if
|
|---|
| 354 | }
|
|---|
| 355 |
|
|---|
| 356 | void ConversionCost::postvisit( ArrayType * ) {}
|
|---|
| 357 |
|
|---|
| 358 | void ConversionCost::postvisit( ReferenceType * refType ) {
|
|---|
| 359 | // Note: dest can never be a reference, since it would have been caught in an earlier check
|
|---|
| 360 | assert( ! dynamic_cast< ReferenceType * >( dest ) );
|
|---|
| 361 | // convert reference to rvalue: cv T1 & => T2
|
|---|
| 362 | // recursively compute conversion cost from T1 to T2.
|
|---|
| 363 | // cv can be safely dropped because of 'implicit dereference' behavior.
|
|---|
| 364 | cost = costFunc( refType->base, dest, indexer, env );
|
|---|
| 365 | if ( refType->base->get_qualifiers() == dest->get_qualifiers() ) {
|
|---|
| 366 | cost.incReference(); // prefer exact qualifiers
|
|---|
| 367 | } else if ( refType->base->get_qualifiers() < dest->get_qualifiers() ) {
|
|---|
| 368 | cost.incSafe(); // then gaining qualifiers
|
|---|
| 369 | } else {
|
|---|
| 370 | cost.incUnsafe(); // lose qualifiers as last resort
|
|---|
| 371 | }
|
|---|
| 372 | PRINT( std::cerr << refType << " ==> " << dest << " " << cost << std::endl; )
|
|---|
| 373 | }
|
|---|
| 374 |
|
|---|
| 375 | void ConversionCost::postvisit( FunctionType * ) {}
|
|---|
| 376 |
|
|---|
| 377 | void ConversionCost::postvisit( StructInstType * inst ) {
|
|---|
| 378 | if ( StructInstType *destAsInst = dynamic_cast< StructInstType* >( dest ) ) {
|
|---|
| 379 | if ( inst->name == destAsInst->name ) {
|
|---|
| 380 | cost = Cost::zero;
|
|---|
| 381 | } // if
|
|---|
| 382 | } // if
|
|---|
| 383 | }
|
|---|
| 384 |
|
|---|
| 385 | void ConversionCost::postvisit( UnionInstType * inst ) {
|
|---|
| 386 | if ( UnionInstType *destAsInst = dynamic_cast< UnionInstType* >( dest ) ) {
|
|---|
| 387 | if ( inst->name == destAsInst->name ) {
|
|---|
| 388 | cost = Cost::zero;
|
|---|
| 389 | } // if
|
|---|
| 390 | } // if
|
|---|
| 391 | }
|
|---|
| 392 |
|
|---|
| 393 | void ConversionCost::postvisit( EnumInstType * ) {
|
|---|
| 394 | static Type::Qualifiers q;
|
|---|
| 395 | static BasicType integer( q, BasicType::SignedInt );
|
|---|
| 396 | cost = costFunc( &integer, dest, indexer, env ); // safe if dest >= int
|
|---|
| 397 | if ( cost < Cost::unsafe ) {
|
|---|
| 398 | cost.incSafe();
|
|---|
| 399 | } // if
|
|---|
| 400 | }
|
|---|
| 401 |
|
|---|
| 402 | void ConversionCost::postvisit( TraitInstType * ) {}
|
|---|
| 403 |
|
|---|
| 404 | void ConversionCost::postvisit( TypeInstType *inst ) {
|
|---|
| 405 | if ( const EqvClass *eqvClass = env.lookup( inst->name ) ) {
|
|---|
| 406 | cost = costFunc( eqvClass->type, dest, indexer, env );
|
|---|
| 407 | } else if ( TypeInstType *destAsInst = dynamic_cast< TypeInstType* >( dest ) ) {
|
|---|
| 408 | if ( inst->name == destAsInst->name ) {
|
|---|
| 409 | cost = Cost::zero;
|
|---|
| 410 | }
|
|---|
| 411 | } else if ( NamedTypeDecl *namedType = indexer.lookupType( inst->name ) ) {
|
|---|
| 412 | TypeDecl *type = dynamic_cast< TypeDecl* >( namedType );
|
|---|
| 413 | // all typedefs should be gone by this point
|
|---|
| 414 | assert( type );
|
|---|
| 415 | if ( type->base ) {
|
|---|
| 416 | cost = costFunc( type->base, dest, indexer, env ) + Cost::safe;
|
|---|
| 417 | } // if
|
|---|
| 418 | } // if
|
|---|
| 419 | }
|
|---|
| 420 |
|
|---|
| 421 | void ConversionCost::postvisit( TupleType * tupleType ) {
|
|---|
| 422 | Cost c = Cost::zero;
|
|---|
| 423 | if ( TupleType * destAsTuple = dynamic_cast< TupleType * >( dest ) ) {
|
|---|
| 424 | std::list< Type * >::const_iterator srcIt = tupleType->types.begin();
|
|---|
| 425 | std::list< Type * >::const_iterator destIt = destAsTuple->types.begin();
|
|---|
| 426 | while ( srcIt != tupleType->types.end() && destIt != destAsTuple->types.end() ) {
|
|---|
| 427 | Cost newCost = costFunc( *srcIt++, *destIt++, indexer, env );
|
|---|
| 428 | if ( newCost == Cost::infinity ) {
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| 429 | return;
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| 430 | } // if
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| 431 | c += newCost;
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| 432 | } // while
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| 433 | if ( destIt != destAsTuple->types.end() ) {
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| 434 | cost = Cost::infinity;
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| 435 | } else {
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| 436 | cost = c;
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| 437 | } // if
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| 438 | } // if
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| 439 | }
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| 440 |
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| 441 | void ConversionCost::postvisit( VarArgsType * ) {
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| 442 | if ( dynamic_cast< VarArgsType* >( dest ) ) {
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| 443 | cost = Cost::zero;
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| 444 | }
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| 445 | }
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| 446 |
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| 447 | void ConversionCost::postvisit( ZeroType * ) {
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| 448 | if ( dynamic_cast< ZeroType * >( dest ) ) {
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| 449 | cost = Cost::zero;
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| 450 | } else if ( BasicType *destAsBasic = dynamic_cast< BasicType* >( dest ) ) {
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| 451 | // copied from visit(BasicType*) for signed int, but +1 for safe conversions
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| 452 | int tableResult = costMatrix[ BasicType::SignedInt ][ destAsBasic->get_kind() ];
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| 453 | if ( tableResult == -1 ) {
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| 454 | cost = Cost::unsafe;
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| 455 | } else {
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| 456 | cost = Cost::zero;
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| 457 | cost.incSafe( tableResult + 1 );
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| 458 | cost.incSign( signMatrix[ BasicType::SignedInt ][ destAsBasic->get_kind() ] );
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| 459 | } // if
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| 460 | } else if ( dynamic_cast< PointerType* >( dest ) ) {
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| 461 | cost = Cost::safe;
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| 462 | } // if
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| 463 | }
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| 464 |
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| 465 | void ConversionCost::postvisit( OneType * ) {
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| 466 | if ( dynamic_cast< OneType * >( dest ) ) {
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| 467 | cost = Cost::zero;
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| 468 | } else if ( BasicType *destAsBasic = dynamic_cast< BasicType* >( dest ) ) {
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| 469 | // copied from visit(BasicType*) for signed int, but +1 for safe conversions
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| 470 | int tableResult = costMatrix[ BasicType::SignedInt ][ destAsBasic->get_kind() ];
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| 471 | if ( tableResult == -1 ) {
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| 472 | cost = Cost::unsafe;
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| 473 | } else {
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| 474 | cost = Cost::zero;
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| 475 | cost.incSafe( tableResult + 1 );
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| 476 | cost.incSign( signMatrix[ BasicType::SignedInt ][ destAsBasic->get_kind() ] );
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| 477 | } // if
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| 478 | } // if
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| 479 | }
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| 480 | } // namespace ResolvExpr
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| 481 |
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| 482 | // Local Variables: //
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| 483 | // tab-width: 4 //
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| 484 | // mode: c++ //
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| 485 | // compile-command: "make install" //
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| 486 | // End: //
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