| 1 | //
|
|---|
| 2 | // Cforall Version 1.0.0 Copyright (C) 2015 University of Waterloo
|
|---|
| 3 | //
|
|---|
| 4 | // The contents of this file are covered under the licence agreement in the
|
|---|
| 5 | // file "LICENCE" distributed with Cforall.
|
|---|
| 6 | //
|
|---|
| 7 | // ConversionCost.cc --
|
|---|
| 8 | //
|
|---|
| 9 | // Author : Richard C. Bilson
|
|---|
| 10 | // Created On : Sun May 17 07:06:19 2015
|
|---|
| 11 | // Last Modified By : Andrew Beach
|
|---|
| 12 | // Last Modified On : Mon Jun 24 13:33:00 2019
|
|---|
| 13 | // Update Count : 26
|
|---|
| 14 | //
|
|---|
| 15 |
|
|---|
| 16 | #include "ConversionCost.h"
|
|---|
| 17 |
|
|---|
| 18 | #include <cassert> // for assert
|
|---|
| 19 | #include <list> // for list, list<>::const_iterator
|
|---|
| 20 | #include <string> // for operator==, string
|
|---|
| 21 |
|
|---|
| 22 | #include "ResolvExpr/Cost.h" // for Cost
|
|---|
| 23 | #include "ResolvExpr/TypeEnvironment.h" // for EqvClass, TypeEnvironment
|
|---|
| 24 | #include "SymTab/Indexer.h" // for Indexer
|
|---|
| 25 | #include "SynTree/Declaration.h" // for TypeDecl, NamedTypeDecl
|
|---|
| 26 | #include "SynTree/Type.h" // for Type, BasicType, TypeInstType
|
|---|
| 27 | #include "typeops.h" // for typesCompatibleIgnoreQualifiers
|
|---|
| 28 |
|
|---|
| 29 | namespace ResolvExpr {
|
|---|
| 30 | #if 0
|
|---|
| 31 | const Cost Cost::zero = Cost{ 0, 0, 0, 0, 0, 0, 0 };
|
|---|
| 32 | const Cost Cost::infinity = Cost{ -1, -1, -1, -1, -1, 1, -1 };
|
|---|
| 33 | const Cost Cost::unsafe = Cost{ 1, 0, 0, 0, 0, 0, 0 };
|
|---|
| 34 | const Cost Cost::poly = Cost{ 0, 1, 0, 0, 0, 0, 0 };
|
|---|
| 35 | const Cost Cost::safe = Cost{ 0, 0, 1, 0, 0, 0, 0 };
|
|---|
| 36 | const Cost Cost::sign = Cost{ 0, 0, 0, 1, 0, 0, 0 };
|
|---|
| 37 | const Cost Cost::var = Cost{ 0, 0, 0, 0, 1, 0, 0 };
|
|---|
| 38 | const Cost Cost::spec = Cost{ 0, 0, 0, 0, 0, -1, 0 };
|
|---|
| 39 | const Cost Cost::reference = Cost{ 0, 0, 0, 0, 0, 0, 1 };
|
|---|
| 40 | #endif
|
|---|
| 41 |
|
|---|
| 42 | #if 0
|
|---|
| 43 | #define PRINT(x) x
|
|---|
| 44 | #else
|
|---|
| 45 | #define PRINT(x)
|
|---|
| 46 | #endif
|
|---|
| 47 |
|
|---|
| 48 | Cost conversionCost( Type *src, Type *dest, const SymTab::Indexer &indexer, const TypeEnvironment &env ) {
|
|---|
| 49 | if ( TypeInstType *destAsTypeInst = dynamic_cast< TypeInstType* >( dest ) ) {
|
|---|
| 50 | PRINT( std::cerr << "type inst " << destAsTypeInst->name; )
|
|---|
| 51 | if ( const EqvClass* eqvClass = env.lookup( destAsTypeInst->name ) ) {
|
|---|
| 52 | if ( eqvClass->type ) {
|
|---|
| 53 | return conversionCost( src, eqvClass->type, indexer, env );
|
|---|
| 54 | } else {
|
|---|
| 55 | return Cost::infinity;
|
|---|
| 56 | }
|
|---|
| 57 | } else if ( NamedTypeDecl *namedType = indexer.lookupType( destAsTypeInst->name ) ) {
|
|---|
| 58 | PRINT( std::cerr << " found" << std::endl; )
|
|---|
| 59 | TypeDecl *type = dynamic_cast< TypeDecl* >( namedType );
|
|---|
| 60 | // all typedefs should be gone by this point
|
|---|
| 61 | assert( type );
|
|---|
| 62 | if ( type->base ) {
|
|---|
| 63 | return conversionCost( src, type->base, indexer, env ) + Cost::safe;
|
|---|
| 64 | } // if
|
|---|
| 65 | } // if
|
|---|
| 66 | PRINT( std::cerr << " not found" << std::endl; )
|
|---|
| 67 | } // if
|
|---|
| 68 | PRINT(
|
|---|
| 69 | std::cerr << "src is ";
|
|---|
| 70 | src->print( std::cerr );
|
|---|
| 71 | std::cerr << std::endl << "dest is ";
|
|---|
| 72 | dest->print( std::cerr );
|
|---|
| 73 | std::cerr << std::endl << "env is" << std::endl;
|
|---|
| 74 | env.print( std::cerr, 8 );
|
|---|
| 75 | )
|
|---|
| 76 | if ( typesCompatibleIgnoreQualifiers( src, dest, indexer, env ) ) {
|
|---|
| 77 | PRINT( std::cerr << "compatible!" << std::endl; )
|
|---|
| 78 | return Cost::zero;
|
|---|
| 79 | } else if ( dynamic_cast< VoidType* >( dest ) ) {
|
|---|
| 80 | return Cost::safe;
|
|---|
| 81 | } else if ( ReferenceType * refType = dynamic_cast< ReferenceType * > ( dest ) ) {
|
|---|
| 82 | PRINT( std::cerr << "conversionCost: dest is reference" << std::endl; )
|
|---|
| 83 | return convertToReferenceCost( src, refType, indexer, env, [](Type * t1, Type * t2, const SymTab::Indexer &, const TypeEnvironment & env ){
|
|---|
| 84 | return ptrsAssignable( t1, t2, env );
|
|---|
| 85 | });
|
|---|
| 86 | } else {
|
|---|
| 87 | PassVisitor<ConversionCost> converter(
|
|---|
| 88 | dest, indexer, env,
|
|---|
| 89 | (Cost (*)(Type*, Type*, const SymTab::Indexer&, const TypeEnvironment&))
|
|---|
| 90 | conversionCost );
|
|---|
| 91 | src->accept( converter );
|
|---|
| 92 | if ( converter.pass.get_cost() == Cost::infinity ) {
|
|---|
| 93 | return Cost::infinity;
|
|---|
| 94 | } else {
|
|---|
| 95 | return converter.pass.get_cost() + Cost::zero;
|
|---|
| 96 | } // if
|
|---|
| 97 | } // if
|
|---|
| 98 | }
|
|---|
| 99 |
|
|---|
| 100 | Cost convertToReferenceCost( Type * src, Type * dest, int diff, const SymTab::Indexer & indexer, const TypeEnvironment & env, PtrsFunction func ) {
|
|---|
| 101 | PRINT( std::cerr << "convert to reference cost... diff " << diff << " " << src << " / " << dest << std::endl; )
|
|---|
| 102 | if ( diff > 0 ) {
|
|---|
| 103 | // TODO: document this
|
|---|
| 104 | Cost cost = convertToReferenceCost( strict_dynamic_cast< ReferenceType * >( src )->base, dest, diff-1, indexer, env, func );
|
|---|
| 105 | cost.incReference();
|
|---|
| 106 | return cost;
|
|---|
| 107 | } else if ( diff < -1 ) {
|
|---|
| 108 | // TODO: document this
|
|---|
| 109 | Cost cost = convertToReferenceCost( src, strict_dynamic_cast< ReferenceType * >( dest )->base, diff+1, indexer, env, func );
|
|---|
| 110 | cost.incReference();
|
|---|
| 111 | return cost;
|
|---|
| 112 | } else if ( diff == 0 ) {
|
|---|
| 113 | ReferenceType * srcAsRef = dynamic_cast< ReferenceType * >( src );
|
|---|
| 114 | ReferenceType * destAsRef = dynamic_cast< ReferenceType * >( dest );
|
|---|
| 115 | if ( srcAsRef && destAsRef ) { // pointer-like conversions between references
|
|---|
| 116 | PRINT( std::cerr << "converting between references" << std::endl; )
|
|---|
| 117 | Type::Qualifiers tq1 = srcAsRef->base->get_qualifiers();
|
|---|
| 118 | Type::Qualifiers tq2 = destAsRef->base->get_qualifiers();
|
|---|
| 119 | if ( tq1 <= tq2 && typesCompatibleIgnoreQualifiers( srcAsRef->base, destAsRef->base, indexer, env ) ) {
|
|---|
| 120 | PRINT( std::cerr << " :: compatible and good qualifiers" << std::endl; )
|
|---|
| 121 | if ( tq1 == tq2 ) {
|
|---|
| 122 | // types are the same
|
|---|
| 123 | return Cost::zero;
|
|---|
| 124 | } else {
|
|---|
| 125 | // types are the same, except otherPointer has more qualifiers
|
|---|
| 126 | return Cost::safe;
|
|---|
| 127 | }
|
|---|
| 128 | } else { // xxx - this discards reference qualifiers from consideration -- reducing qualifiers is a safe conversion; is this right?
|
|---|
| 129 | int assignResult = func( srcAsRef->base, destAsRef->base, indexer, env );
|
|---|
| 130 | PRINT( std::cerr << "comparing references: " << assignResult << " " << srcAsRef << " " << destAsRef << std::endl; )
|
|---|
| 131 | if ( assignResult > 0 ) {
|
|---|
| 132 | return Cost::safe;
|
|---|
| 133 | } else if ( assignResult < 0 ) {
|
|---|
| 134 | return Cost::unsafe;
|
|---|
| 135 | } // if
|
|---|
| 136 | } // if
|
|---|
| 137 | } else {
|
|---|
| 138 | PRINT( std::cerr << "reference to rvalue conversion" << std::endl; )
|
|---|
| 139 | PassVisitor<ConversionCost> converter(
|
|---|
| 140 | dest, indexer, env,
|
|---|
| 141 | (Cost (*)(Type*, Type*, const SymTab::Indexer&, const TypeEnvironment&))
|
|---|
| 142 | conversionCost );
|
|---|
| 143 | src->accept( converter );
|
|---|
| 144 | return converter.pass.get_cost();
|
|---|
| 145 | } // if
|
|---|
| 146 | } else {
|
|---|
| 147 | ReferenceType * destAsRef = dynamic_cast< ReferenceType * >( dest );
|
|---|
| 148 | assert( diff == -1 && destAsRef );
|
|---|
| 149 | PRINT( std::cerr << "dest is: " << dest << " / src is: " << src << std::endl; )
|
|---|
| 150 | if ( typesCompatibleIgnoreQualifiers( src, destAsRef->base, indexer, env ) ) {
|
|---|
| 151 | PRINT( std::cerr << "converting compatible base type" << std::endl; )
|
|---|
| 152 | if ( src->get_lvalue() ) {
|
|---|
| 153 | PRINT(
|
|---|
| 154 | std::cerr << "lvalue to reference conversion" << std::endl;
|
|---|
| 155 | std::cerr << src << " => " << destAsRef << std::endl;
|
|---|
| 156 | )
|
|---|
| 157 | // lvalue-to-reference conversion: cv lvalue T => cv T &
|
|---|
| 158 | if ( src->get_qualifiers() == destAsRef->base->get_qualifiers() ) {
|
|---|
| 159 | return Cost::reference; // cost needs to be non-zero to add cast
|
|---|
| 160 | } if ( src->get_qualifiers() < destAsRef->base->get_qualifiers() ) {
|
|---|
| 161 | return Cost::safe; // cost needs to be higher than previous cast to differentiate adding qualifiers vs. keeping same
|
|---|
| 162 | } else {
|
|---|
| 163 | return Cost::unsafe;
|
|---|
| 164 | } // if
|
|---|
| 165 | } else if ( destAsRef->base->get_const() ) {
|
|---|
| 166 | PRINT( std::cerr << "rvalue to const ref conversion" << std::endl; )
|
|---|
| 167 | // rvalue-to-const-reference conversion: T => const T &
|
|---|
| 168 | return Cost::safe;
|
|---|
| 169 | } else {
|
|---|
| 170 | PRINT( std::cerr << "rvalue to non-const reference conversion" << std::endl; )
|
|---|
| 171 | // rvalue-to-reference conversion: T => T &
|
|---|
| 172 | return Cost::unsafe;
|
|---|
| 173 | } // if
|
|---|
| 174 | } // if
|
|---|
| 175 | PRINT( std::cerr << "attempting to convert from incompatible base type -- fail" << std::endl; )
|
|---|
| 176 | }
|
|---|
| 177 | return Cost::infinity;
|
|---|
| 178 | }
|
|---|
| 179 |
|
|---|
| 180 | Cost convertToReferenceCost( Type * src, ReferenceType * dest, const SymTab::Indexer & indexer, const TypeEnvironment & env, PtrsFunction func ) {
|
|---|
| 181 | int sdepth = src->referenceDepth(), ddepth = dest->referenceDepth();
|
|---|
| 182 | Cost cost = convertToReferenceCost( src, dest, sdepth-ddepth, indexer, env, func );
|
|---|
| 183 | PRINT( std::cerr << "convertToReferenceCost result: " << cost << std::endl; )
|
|---|
| 184 | return cost;
|
|---|
| 185 | }
|
|---|
| 186 |
|
|---|
| 187 | ConversionCost::ConversionCost( Type *dest, const SymTab::Indexer &indexer, const TypeEnvironment &env, CostFunction costFunc )
|
|---|
| 188 | : dest( dest ), indexer( indexer ), cost( Cost::infinity ), env( env ), costFunc( costFunc ) {
|
|---|
| 189 | }
|
|---|
| 190 |
|
|---|
| 191 | // GENERATED START, DO NOT EDIT
|
|---|
| 192 | // GENERATED BY BasicTypes-gen.cc
|
|---|
| 193 | /* EXTENDED INTEGRAL RANK HIERARCHY (root to leaves)
|
|---|
| 194 | _Bool
|
|---|
| 195 | char signed char unsigned char
|
|---|
| 196 | signed short int unsigned short int
|
|---|
| 197 | signed int unsigned int
|
|---|
| 198 | signed long int unsigned long int
|
|---|
| 199 | signed long long int unsigned long long int
|
|---|
| 200 | __int128 unsigned __int128
|
|---|
| 201 | _Float16 _Float16 _Complex
|
|---|
| 202 | _Float32 _Float32 _Complex
|
|---|
| 203 | float float _Complex
|
|---|
| 204 | _Float32x _Float32x _Complex
|
|---|
| 205 | _Float64 _Float64 _Complex
|
|---|
| 206 | double double _Complex
|
|---|
| 207 | _Float64x _Float64x _Complex
|
|---|
| 208 | __float80
|
|---|
| 209 | _Float128 _Float128 _Complex
|
|---|
| 210 | __float128
|
|---|
| 211 | long double long double _Complex
|
|---|
| 212 | _Float128x _Float128x _Complex
|
|---|
| 213 | */
|
|---|
| 214 | // GENERATED END
|
|---|
| 215 |
|
|---|
| 216 | // GENERATED START, DO NOT EDIT
|
|---|
| 217 | // GENERATED BY BasicTypes-gen.cc
|
|---|
| 218 | static const int costMatrix[BasicType::NUMBER_OF_BASIC_TYPES][BasicType::NUMBER_OF_BASIC_TYPES] = { // path length from root to node
|
|---|
| 219 | /* 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 */
|
|---|
| 220 | /* 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, },
|
|---|
| 221 | /* 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, },
|
|---|
| 222 | /* 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, },
|
|---|
| 223 | /* 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, },
|
|---|
| 224 | /* 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, },
|
|---|
| 225 | /* 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, },
|
|---|
| 226 | /* 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, },
|
|---|
| 227 | /* 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, },
|
|---|
| 228 | /* 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, },
|
|---|
| 229 | /* 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, },
|
|---|
| 230 | /* 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, },
|
|---|
| 231 | /* 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, },
|
|---|
| 232 | /* 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, },
|
|---|
| 233 | /* 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, },
|
|---|
| 234 | /* _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, },
|
|---|
| 235 | /* _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, },
|
|---|
| 236 | /* _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, },
|
|---|
| 237 | /* _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, },
|
|---|
| 238 | /* 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, },
|
|---|
| 239 | /* 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, },
|
|---|
| 240 | /* _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, },
|
|---|
| 241 | /* _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, },
|
|---|
| 242 | /* 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, },
|
|---|
| 243 | /* _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, },
|
|---|
| 244 | /* 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, },
|
|---|
| 245 | /* 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, },
|
|---|
| 246 | /* 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, },
|
|---|
| 247 | /* _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, },
|
|---|
| 248 | /* 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, },
|
|---|
| 249 | /* _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, },
|
|---|
| 250 | /* _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, },
|
|---|
| 251 | /* 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, },
|
|---|
| 252 | /* 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, },
|
|---|
| 253 | /* 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, },
|
|---|
| 254 | /* _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, },
|
|---|
| 255 | /*_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, },
|
|---|
| 256 | }; // costMatrix
|
|---|
| 257 | static const int maxIntCost = 15;
|
|---|
| 258 | // GENERATED END
|
|---|
| 259 | static_assert(
|
|---|
| 260 | sizeof(costMatrix)/sizeof(costMatrix[0][0]) == BasicType::NUMBER_OF_BASIC_TYPES*BasicType::NUMBER_OF_BASIC_TYPES,
|
|---|
| 261 | "Missing row in the cost matrix"
|
|---|
| 262 | );
|
|---|
| 263 |
|
|---|
| 264 | // GENERATED START, DO NOT EDIT
|
|---|
| 265 | // GENERATED BY BasicTypes-gen.cc
|
|---|
| 266 | static const int signMatrix[BasicType::NUMBER_OF_BASIC_TYPES][BasicType::NUMBER_OF_BASIC_TYPES] = { // number of sign changes in safe conversion
|
|---|
| 267 | /* 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 */
|
|---|
| 268 | /* 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, },
|
|---|
| 269 | /* 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, },
|
|---|
| 270 | /* 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, },
|
|---|
| 271 | /* 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, },
|
|---|
| 272 | /* 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, },
|
|---|
| 273 | /* 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, },
|
|---|
| 274 | /* 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, },
|
|---|
| 275 | /* 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, },
|
|---|
| 276 | /* 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, },
|
|---|
| 277 | /* 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, },
|
|---|
| 278 | /* 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, },
|
|---|
| 279 | /* 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, },
|
|---|
| 280 | /* 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, },
|
|---|
| 281 | /* 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, },
|
|---|
| 282 | /* _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, },
|
|---|
| 283 | /* _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, },
|
|---|
| 284 | /* _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, },
|
|---|
| 285 | /* _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, },
|
|---|
| 286 | /* 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, },
|
|---|
| 287 | /* 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, },
|
|---|
| 288 | /* _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, },
|
|---|
| 289 | /* _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, },
|
|---|
| 290 | /* 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, },
|
|---|
| 291 | /* _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, },
|
|---|
| 292 | /* 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, },
|
|---|
| 293 | /* 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, },
|
|---|
| 294 | /* 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, },
|
|---|
| 295 | /* _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, },
|
|---|
| 296 | /* 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, },
|
|---|
| 297 | /* _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, },
|
|---|
| 298 | /* _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, },
|
|---|
| 299 | /* 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, },
|
|---|
| 300 | /* 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, },
|
|---|
| 301 | /* 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, },
|
|---|
| 302 | /* _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, },
|
|---|
| 303 | /*_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, },
|
|---|
| 304 | }; // signMatrix
|
|---|
| 305 | // GENERATED END
|
|---|
| 306 | static_assert(
|
|---|
| 307 | sizeof(signMatrix)/sizeof(signMatrix[0][0]) == BasicType::NUMBER_OF_BASIC_TYPES*BasicType::NUMBER_OF_BASIC_TYPES,
|
|---|
| 308 | "Missing row in the sign matrix"
|
|---|
| 309 | );
|
|---|
| 310 |
|
|---|
| 311 | void ConversionCost::postvisit( VoidType * ) {
|
|---|
| 312 | cost = Cost::infinity;
|
|---|
| 313 | }
|
|---|
| 314 |
|
|---|
| 315 | void ConversionCost::postvisit(BasicType *basicType) {
|
|---|
| 316 | if ( BasicType *destAsBasic = dynamic_cast< BasicType* >( dest ) ) {
|
|---|
| 317 | int tableResult = costMatrix[ basicType->get_kind() ][ destAsBasic->get_kind() ];
|
|---|
| 318 | if ( tableResult == -1 ) {
|
|---|
| 319 | cost = Cost::unsafe;
|
|---|
| 320 | } else {
|
|---|
| 321 | cost = Cost::zero;
|
|---|
| 322 | cost.incSafe( tableResult );
|
|---|
| 323 | cost.incSign( signMatrix[ basicType->get_kind() ][ destAsBasic->get_kind() ] );
|
|---|
| 324 | } // if
|
|---|
| 325 | } else if ( dynamic_cast< EnumInstType *>( dest ) ) {
|
|---|
| 326 | // xxx - not positive this is correct, but appears to allow casting int => enum
|
|---|
| 327 | cost = Cost::unsafe;
|
|---|
| 328 | } // if
|
|---|
| 329 | // no cases for zero_t/one_t because it should not be possible to convert int, etc. to zero_t/one_t.
|
|---|
| 330 | }
|
|---|
| 331 |
|
|---|
| 332 | void ConversionCost::postvisit( PointerType * pointerType ) {
|
|---|
| 333 | if ( PointerType *destAsPtr = dynamic_cast< PointerType* >( dest ) ) {
|
|---|
| 334 | PRINT( std::cerr << pointerType << " ===> " << destAsPtr << std::endl; )
|
|---|
| 335 | Type::Qualifiers tq1 = pointerType->base->get_qualifiers();
|
|---|
| 336 | Type::Qualifiers tq2 = destAsPtr->base->get_qualifiers();
|
|---|
| 337 | if ( tq1 <= tq2 && typesCompatibleIgnoreQualifiers( pointerType->base, destAsPtr->base, indexer, env ) ) {
|
|---|
| 338 | PRINT( std::cerr << " :: compatible and good qualifiers" << std::endl; )
|
|---|
| 339 | if ( tq1 == tq2 ) {
|
|---|
| 340 | // types are the same
|
|---|
| 341 | cost = Cost::zero;
|
|---|
| 342 | } else {
|
|---|
| 343 | // types are the same, except otherPointer has more qualifiers
|
|---|
| 344 | cost = Cost::safe;
|
|---|
| 345 | } // if
|
|---|
| 346 | } else {
|
|---|
| 347 | int assignResult = ptrsAssignable( pointerType->base, destAsPtr->base, env );
|
|---|
| 348 | PRINT( std::cerr << " :: " << assignResult << std::endl; )
|
|---|
| 349 | if ( assignResult > 0 && tq1 <= tq2 ) {
|
|---|
| 350 | // 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?
|
|---|
| 351 | if ( tq1 == tq2 ) {
|
|---|
| 352 | cost = Cost::safe;
|
|---|
| 353 | } else if ( tq1 < tq2 ) {
|
|---|
| 354 | cost = Cost::safe+Cost::safe;
|
|---|
| 355 | }
|
|---|
| 356 | } else if ( assignResult < 0 ) {
|
|---|
| 357 | cost = Cost::unsafe;
|
|---|
| 358 | } // if
|
|---|
| 359 | // assignResult == 0 means Cost::Infinity
|
|---|
| 360 | } // if
|
|---|
| 361 | // case case for zero_t because it should not be possible to convert pointers to zero_t.
|
|---|
| 362 | } // if
|
|---|
| 363 | }
|
|---|
| 364 |
|
|---|
| 365 | void ConversionCost::postvisit( ArrayType * ) {}
|
|---|
| 366 |
|
|---|
| 367 | void ConversionCost::postvisit( ReferenceType * refType ) {
|
|---|
| 368 | // Note: dest can never be a reference, since it would have been caught in an earlier check
|
|---|
| 369 | assert( ! dynamic_cast< ReferenceType * >( dest ) );
|
|---|
| 370 | // convert reference to rvalue: cv T1 & => T2
|
|---|
| 371 | // recursively compute conversion cost from T1 to T2.
|
|---|
| 372 | // cv can be safely dropped because of 'implicit dereference' behavior.
|
|---|
| 373 | cost = costFunc( refType->base, dest, indexer, env );
|
|---|
| 374 | if ( refType->base->get_qualifiers() == dest->get_qualifiers() ) {
|
|---|
| 375 | cost.incReference(); // prefer exact qualifiers
|
|---|
| 376 | } else if ( refType->base->get_qualifiers() < dest->get_qualifiers() ) {
|
|---|
| 377 | cost.incSafe(); // then gaining qualifiers
|
|---|
| 378 | } else {
|
|---|
| 379 | cost.incUnsafe(); // lose qualifiers as last resort
|
|---|
| 380 | }
|
|---|
| 381 | PRINT( std::cerr << refType << " ==> " << dest << " " << cost << std::endl; )
|
|---|
| 382 | }
|
|---|
| 383 |
|
|---|
| 384 | void ConversionCost::postvisit( FunctionType * ) {}
|
|---|
| 385 |
|
|---|
| 386 | void ConversionCost::postvisit( StructInstType * inst ) {
|
|---|
| 387 | if ( StructInstType *destAsInst = dynamic_cast< StructInstType* >( dest ) ) {
|
|---|
| 388 | if ( inst->name == destAsInst->name ) {
|
|---|
| 389 | cost = Cost::zero;
|
|---|
| 390 | } // if
|
|---|
| 391 | } // if
|
|---|
| 392 | }
|
|---|
| 393 |
|
|---|
| 394 | void ConversionCost::postvisit( UnionInstType * inst ) {
|
|---|
| 395 | if ( UnionInstType *destAsInst = dynamic_cast< UnionInstType* >( dest ) ) {
|
|---|
| 396 | if ( inst->name == destAsInst->name ) {
|
|---|
| 397 | cost = Cost::zero;
|
|---|
| 398 | } // if
|
|---|
| 399 | } // if
|
|---|
| 400 | }
|
|---|
| 401 |
|
|---|
| 402 | void ConversionCost::postvisit( EnumInstType * ) {
|
|---|
| 403 | static Type::Qualifiers q;
|
|---|
| 404 | static BasicType integer( q, BasicType::SignedInt );
|
|---|
| 405 | cost = costFunc( &integer, dest, indexer, env ); // safe if dest >= int
|
|---|
| 406 | if ( cost < Cost::unsafe ) {
|
|---|
| 407 | cost.incSafe();
|
|---|
| 408 | } // if
|
|---|
| 409 | }
|
|---|
| 410 |
|
|---|
| 411 | void ConversionCost::postvisit( TraitInstType * ) {}
|
|---|
| 412 |
|
|---|
| 413 | void ConversionCost::postvisit( TypeInstType *inst ) {
|
|---|
| 414 | if ( const EqvClass *eqvClass = env.lookup( inst->name ) ) {
|
|---|
| 415 | cost = costFunc( eqvClass->type, dest, indexer, env );
|
|---|
| 416 | } else if ( TypeInstType *destAsInst = dynamic_cast< TypeInstType* >( dest ) ) {
|
|---|
| 417 | if ( inst->name == destAsInst->name ) {
|
|---|
| 418 | cost = Cost::zero;
|
|---|
| 419 | }
|
|---|
| 420 | } else if ( NamedTypeDecl *namedType = indexer.lookupType( inst->name ) ) {
|
|---|
| 421 | TypeDecl *type = dynamic_cast< TypeDecl* >( namedType );
|
|---|
| 422 | // all typedefs should be gone by this point
|
|---|
| 423 | assert( type );
|
|---|
| 424 | if ( type->base ) {
|
|---|
| 425 | cost = costFunc( type->base, dest, indexer, env ) + Cost::safe;
|
|---|
| 426 | } // if
|
|---|
| 427 | } // if
|
|---|
| 428 | }
|
|---|
| 429 |
|
|---|
| 430 | void ConversionCost::postvisit( TupleType * tupleType ) {
|
|---|
| 431 | Cost c = Cost::zero;
|
|---|
| 432 | if ( TupleType * destAsTuple = dynamic_cast< TupleType * >( dest ) ) {
|
|---|
| 433 | std::list< Type * >::const_iterator srcIt = tupleType->types.begin();
|
|---|
| 434 | std::list< Type * >::const_iterator destIt = destAsTuple->types.begin();
|
|---|
| 435 | while ( srcIt != tupleType->types.end() && destIt != destAsTuple->types.end() ) {
|
|---|
| 436 | Cost newCost = costFunc( *srcIt++, *destIt++, indexer, env );
|
|---|
| 437 | if ( newCost == Cost::infinity ) {
|
|---|
| 438 | return;
|
|---|
| 439 | } // if
|
|---|
| 440 | c += newCost;
|
|---|
| 441 | } // while
|
|---|
| 442 | if ( destIt != destAsTuple->types.end() ) {
|
|---|
| 443 | cost = Cost::infinity;
|
|---|
| 444 | } else {
|
|---|
| 445 | cost = c;
|
|---|
| 446 | } // if
|
|---|
| 447 | } // if
|
|---|
| 448 | }
|
|---|
| 449 |
|
|---|
| 450 | void ConversionCost::postvisit( VarArgsType * ) {
|
|---|
| 451 | if ( dynamic_cast< VarArgsType* >( dest ) ) {
|
|---|
| 452 | cost = Cost::zero;
|
|---|
| 453 | }
|
|---|
| 454 | }
|
|---|
| 455 |
|
|---|
| 456 | void ConversionCost::postvisit( ZeroType * ) {
|
|---|
| 457 | if ( dynamic_cast< ZeroType * >( dest ) ) {
|
|---|
| 458 | cost = Cost::zero;
|
|---|
| 459 | } else if ( BasicType *destAsBasic = dynamic_cast< BasicType* >( dest ) ) {
|
|---|
| 460 | // copied from visit(BasicType*) for signed int, but +1 for safe conversions
|
|---|
| 461 | int tableResult = costMatrix[ BasicType::SignedInt ][ destAsBasic->get_kind() ];
|
|---|
| 462 | if ( tableResult == -1 ) {
|
|---|
| 463 | cost = Cost::unsafe;
|
|---|
| 464 | } else {
|
|---|
| 465 | cost = Cost::zero;
|
|---|
| 466 | cost.incSafe( tableResult + 1 );
|
|---|
| 467 | cost.incSign( signMatrix[ BasicType::SignedInt ][ destAsBasic->get_kind() ] );
|
|---|
| 468 | } // if
|
|---|
| 469 | } else if ( dynamic_cast< PointerType* >( dest ) ) {
|
|---|
| 470 | cost = Cost::zero;
|
|---|
| 471 | cost.incSafe( maxIntCost + 2 ); // +1 for zero_t -> int, +1 for disambiguation
|
|---|
| 472 | } // if
|
|---|
| 473 | }
|
|---|
| 474 |
|
|---|
| 475 | void ConversionCost::postvisit( OneType * ) {
|
|---|
| 476 | if ( dynamic_cast< OneType * >( dest ) ) {
|
|---|
| 477 | cost = Cost::zero;
|
|---|
| 478 | } else if ( BasicType *destAsBasic = dynamic_cast< BasicType* >( dest ) ) {
|
|---|
| 479 | // copied from visit(BasicType*) for signed int, but +1 for safe conversions
|
|---|
| 480 | int tableResult = costMatrix[ BasicType::SignedInt ][ destAsBasic->get_kind() ];
|
|---|
| 481 | if ( tableResult == -1 ) {
|
|---|
| 482 | cost = Cost::unsafe;
|
|---|
| 483 | } else {
|
|---|
| 484 | cost = Cost::zero;
|
|---|
| 485 | cost.incSafe( tableResult + 1 );
|
|---|
| 486 | cost.incSign( signMatrix[ BasicType::SignedInt ][ destAsBasic->get_kind() ] );
|
|---|
| 487 | } // if
|
|---|
| 488 | } // if
|
|---|
| 489 | }
|
|---|
| 490 |
|
|---|
| 491 | static int localPtrsAssignable(const ast::Type * t1, const ast::Type * t2,
|
|---|
| 492 | const ast::SymbolTable &, const ast::TypeEnvironment & env ) {
|
|---|
| 493 | return ptrsAssignable( t1, t2, env );
|
|---|
| 494 | }
|
|---|
| 495 |
|
|---|
| 496 | // TODO: This is used for overload resolution. It might be able to be dropped once the old system
|
|---|
| 497 | // is removed.
|
|---|
| 498 | static Cost localConversionCost(
|
|---|
| 499 | const ast::Type * src, const ast::Type * dst, const ast::SymbolTable & symtab,
|
|---|
| 500 | const ast::TypeEnvironment & env
|
|---|
| 501 | ) { return conversionCost( src, dst, symtab, env ); }
|
|---|
| 502 |
|
|---|
| 503 | Cost conversionCost(
|
|---|
| 504 | const ast::Type * src, const ast::Type * dst, const ast::SymbolTable & symtab,
|
|---|
| 505 | const ast::TypeEnvironment & env
|
|---|
| 506 | ) {
|
|---|
| 507 | if ( const ast::TypeInstType * inst = dynamic_cast< const ast::TypeInstType * >( dst ) ) {
|
|---|
| 508 | if ( const ast::EqvClass * eqv = env.lookup( inst->name ) ) {
|
|---|
| 509 | if ( eqv->bound ) {
|
|---|
| 510 | return conversionCost(src, eqv->bound, symtab, env );
|
|---|
| 511 | } else {
|
|---|
| 512 | return Cost::infinity;
|
|---|
| 513 | }
|
|---|
| 514 | } else if ( const ast::NamedTypeDecl * named = symtab.lookupType( inst->name ) ) {
|
|---|
| 515 | const ast::TypeDecl * type = dynamic_cast< const ast::TypeDecl * >( named );
|
|---|
| 516 | assertf( type, "Unexpected typedef." );
|
|---|
| 517 | if ( type->base ) {
|
|---|
| 518 | return conversionCost( src, type->base, symtab, env ) + Cost::safe;
|
|---|
| 519 | }
|
|---|
| 520 | }
|
|---|
| 521 | }
|
|---|
| 522 | if ( typesCompatibleIgnoreQualifiers( src, dst, symtab, env ) ) {
|
|---|
| 523 | return Cost::zero;
|
|---|
| 524 | } else if ( dynamic_cast< const ast::VoidType * >( dst ) ) {
|
|---|
| 525 | return Cost::safe;
|
|---|
| 526 | } else if ( const ast::ReferenceType * refType =
|
|---|
| 527 | dynamic_cast< const ast::ReferenceType * >( dst ) ) {
|
|---|
| 528 | return convertToReferenceCost( src, refType, symtab, env, localPtrsAssignable );
|
|---|
| 529 | } else {
|
|---|
| 530 | ast::Pass<ConversionCost_new> converter( dst, symtab, env, localConversionCost );
|
|---|
| 531 | src->accept( converter );
|
|---|
| 532 | return converter.pass.cost;
|
|---|
| 533 | }
|
|---|
| 534 | }
|
|---|
| 535 |
|
|---|
| 536 | Cost convertToReferenceCost( const ast::Type * src, const ast::Type * dst, int diff,
|
|---|
| 537 | const ast::SymbolTable & symtab, const ast::TypeEnvironment & env,
|
|---|
| 538 | NumCostCalculation func ) {
|
|---|
| 539 | if ( 0 < diff ) {
|
|---|
| 540 | Cost cost = convertToReferenceCost(
|
|---|
| 541 | strict_dynamic_cast< const ast::ReferenceType * >( src )->base,
|
|---|
| 542 | dst, (diff - 1), symtab, env, func );
|
|---|
| 543 | cost.incReference();
|
|---|
| 544 | return cost;
|
|---|
| 545 | } else if ( diff < -1 ) {
|
|---|
| 546 | Cost cost = convertToReferenceCost(
|
|---|
| 547 | src, strict_dynamic_cast< const ast::ReferenceType * >( dst )->base,
|
|---|
| 548 | (diff + 1), symtab, env, func );
|
|---|
| 549 | cost.incReference();
|
|---|
| 550 | return cost;
|
|---|
| 551 | } else if ( 0 == diff ) {
|
|---|
| 552 | const ast::ReferenceType * srcAsRef = dynamic_cast< const ast::ReferenceType * >( src );
|
|---|
| 553 | const ast::ReferenceType * dstAsRef = dynamic_cast< const ast::ReferenceType * >( dst );
|
|---|
| 554 | if ( srcAsRef && dstAsRef ) {
|
|---|
| 555 | ast::CV::Qualifiers tq1 = srcAsRef->base->qualifiers;
|
|---|
| 556 | ast::CV::Qualifiers tq2 = dstAsRef->base->qualifiers;
|
|---|
| 557 | if ( tq1 <= tq2 && typesCompatibleIgnoreQualifiers(
|
|---|
| 558 | srcAsRef->base, dstAsRef->base, symtab, env ) ) {
|
|---|
| 559 | if ( tq1 == tq2 ) {
|
|---|
| 560 | return Cost::zero;
|
|---|
| 561 | } else {
|
|---|
| 562 | return Cost::safe;
|
|---|
| 563 | }
|
|---|
| 564 | } else {
|
|---|
| 565 | int assignResult = func( srcAsRef->base, dstAsRef->base, symtab, env );
|
|---|
| 566 | if ( 0 < assignResult ) {
|
|---|
| 567 | return Cost::safe;
|
|---|
| 568 | } else if ( assignResult < 0 ) {
|
|---|
| 569 | return Cost::unsafe;
|
|---|
| 570 | }
|
|---|
| 571 | }
|
|---|
| 572 | } else {
|
|---|
| 573 | ast::Pass<ConversionCost_new> converter( dst, symtab, env, localConversionCost );
|
|---|
| 574 | src->accept( converter );
|
|---|
| 575 | return converter.pass.cost;
|
|---|
| 576 | }
|
|---|
| 577 | } else {
|
|---|
| 578 | assert( -1 == diff );
|
|---|
| 579 | const ast::ReferenceType * dstAsRef = dynamic_cast< const ast::ReferenceType * >( dst );
|
|---|
| 580 | assert( dstAsRef );
|
|---|
| 581 | if ( typesCompatibleIgnoreQualifiers( src, dstAsRef->base, symtab, env ) ) {
|
|---|
| 582 | if ( src->is_lvalue() ) {
|
|---|
| 583 | if ( src->qualifiers == dstAsRef->base->qualifiers ) {
|
|---|
| 584 | return Cost::reference;
|
|---|
| 585 | } else if ( src->qualifiers < dstAsRef->base->qualifiers ) {
|
|---|
| 586 | return Cost::safe;
|
|---|
| 587 | } else {
|
|---|
| 588 | return Cost::unsafe;
|
|---|
| 589 | }
|
|---|
| 590 | } else if ( dstAsRef->base->is_const() ) {
|
|---|
| 591 | return Cost::safe;
|
|---|
| 592 | } else {
|
|---|
| 593 | return Cost::unsafe;
|
|---|
| 594 | }
|
|---|
| 595 | }
|
|---|
| 596 | }
|
|---|
| 597 | return Cost::infinity;
|
|---|
| 598 | }
|
|---|
| 599 |
|
|---|
| 600 | Cost convertToReferenceCost( const ast::Type * src, const ast::ReferenceType * dst,
|
|---|
| 601 | const ast::SymbolTable & symtab, const ast::TypeEnvironment & env,
|
|---|
| 602 | NumCostCalculation func ) {
|
|---|
| 603 | int sdepth = src->referenceDepth(), ddepth = dst->referenceDepth();
|
|---|
| 604 | return convertToReferenceCost( src, dst, sdepth - ddepth, symtab, env, func );
|
|---|
| 605 | }
|
|---|
| 606 |
|
|---|
| 607 | void ConversionCost_new::postvisit( const ast::VoidType * voidType ) {
|
|---|
| 608 | (void)voidType;
|
|---|
| 609 | cost = Cost::infinity;
|
|---|
| 610 | }
|
|---|
| 611 |
|
|---|
| 612 | void ConversionCost_new::postvisit( const ast::BasicType * basicType ) {
|
|---|
| 613 | if ( const ast::BasicType * dstAsBasic = dynamic_cast< const ast::BasicType * >( dst ) ) {
|
|---|
| 614 | int tableResult = costMatrix[ basicType->kind ][ dstAsBasic->kind ];
|
|---|
| 615 | if ( tableResult == -1 ) {
|
|---|
| 616 | cost = Cost::unsafe;
|
|---|
| 617 | } else {
|
|---|
| 618 | cost = Cost::zero;
|
|---|
| 619 | cost.incSafe( tableResult );
|
|---|
| 620 | cost.incSign( signMatrix[ basicType->kind ][ dstAsBasic->kind ] );
|
|---|
| 621 | }
|
|---|
| 622 | } else if ( dynamic_cast< const ast::EnumInstType * >( dst ) ) {
|
|---|
| 623 | // xxx - not positive this is correct, but appears to allow casting int => enum
|
|---|
| 624 | cost = Cost::unsafe;
|
|---|
| 625 | }
|
|---|
| 626 | }
|
|---|
| 627 |
|
|---|
| 628 | void ConversionCost_new::postvisit( const ast::PointerType * pointerType ) {
|
|---|
| 629 | if ( const ast::PointerType * dstAsPtr = dynamic_cast< const ast::PointerType * >( dst ) ) {
|
|---|
| 630 | ast::CV::Qualifiers tq1 = pointerType->base->qualifiers;
|
|---|
| 631 | ast::CV::Qualifiers tq2 = dstAsPtr->base->qualifiers;
|
|---|
| 632 | if ( tq1 <= tq2 && typesCompatibleIgnoreQualifiers(
|
|---|
| 633 | pointerType->base, dstAsPtr->base, symtab, env ) ) {
|
|---|
| 634 | if ( tq1 == tq2 ) {
|
|---|
| 635 | cost = Cost::zero;
|
|---|
| 636 | } else {
|
|---|
| 637 | cost = Cost::safe;
|
|---|
| 638 | }
|
|---|
| 639 | } else {
|
|---|
| 640 | int assignResult = ptrsAssignable( pointerType->base, dstAsPtr->base, env );
|
|---|
| 641 | if ( 0 < assignResult && tq1 <= tq2 ) {
|
|---|
| 642 | if ( tq1 == tq2 ) {
|
|---|
| 643 | cost = Cost::safe;
|
|---|
| 644 | } else {
|
|---|
| 645 | cost = Cost::safe + Cost::safe;
|
|---|
| 646 | }
|
|---|
| 647 | } else if ( assignResult < 0 ) {
|
|---|
| 648 | cost = Cost::unsafe;
|
|---|
| 649 | } // else Cost::infinity
|
|---|
| 650 | }
|
|---|
| 651 | }
|
|---|
| 652 | }
|
|---|
| 653 |
|
|---|
| 654 | void ConversionCost_new::postvisit( const ast::ArrayType * arrayType ) {
|
|---|
| 655 | (void)arrayType;
|
|---|
| 656 | }
|
|---|
| 657 |
|
|---|
| 658 | void ConversionCost_new::postvisit( const ast::ReferenceType * refType ) {
|
|---|
| 659 | assert( nullptr == dynamic_cast< const ast::ReferenceType * >( dst ) );
|
|---|
| 660 |
|
|---|
| 661 | cost = costCalc( refType->base, dst, symtab, env );
|
|---|
| 662 | if ( refType->base->qualifiers == dst->qualifiers ) {
|
|---|
| 663 | cost.incReference();
|
|---|
| 664 | } else if ( refType->base->qualifiers < dst->qualifiers ) {
|
|---|
| 665 | cost.incSafe();
|
|---|
| 666 | } else {
|
|---|
| 667 | cost.incUnsafe();
|
|---|
| 668 | }
|
|---|
| 669 | }
|
|---|
| 670 |
|
|---|
| 671 | void ConversionCost_new::postvisit( const ast::FunctionType * functionType ) {
|
|---|
| 672 | (void)functionType;
|
|---|
| 673 | }
|
|---|
| 674 |
|
|---|
| 675 | void ConversionCost_new::postvisit( const ast::StructInstType * structInstType ) {
|
|---|
| 676 | if ( const ast::StructInstType * dstAsInst =
|
|---|
| 677 | dynamic_cast< const ast::StructInstType * >( dst ) ) {
|
|---|
| 678 | if ( structInstType->name == dstAsInst->name ) {
|
|---|
| 679 | cost = Cost::zero;
|
|---|
| 680 | }
|
|---|
| 681 | }
|
|---|
| 682 | }
|
|---|
| 683 |
|
|---|
| 684 | void ConversionCost_new::postvisit( const ast::UnionInstType * unionInstType ) {
|
|---|
| 685 | if ( const ast::UnionInstType * dstAsInst =
|
|---|
| 686 | dynamic_cast< const ast::UnionInstType * >( dst ) ) {
|
|---|
| 687 | if ( unionInstType->name == dstAsInst->name ) {
|
|---|
| 688 | cost = Cost::zero;
|
|---|
| 689 | }
|
|---|
| 690 | }
|
|---|
| 691 | }
|
|---|
| 692 |
|
|---|
| 693 | void ConversionCost_new::postvisit( const ast::EnumInstType * enumInstType ) {
|
|---|
| 694 | (void)enumInstType;
|
|---|
| 695 | static const ast::BasicType integer( ast::BasicType::SignedInt );
|
|---|
| 696 | cost = costCalc( &integer, dst, symtab, env );
|
|---|
| 697 | if ( cost < Cost::unsafe ) {
|
|---|
| 698 | cost.incSafe();
|
|---|
| 699 | }
|
|---|
| 700 | }
|
|---|
| 701 |
|
|---|
| 702 | void ConversionCost_new::postvisit( const ast::TraitInstType * traitInstType ) {
|
|---|
| 703 | (void)traitInstType;
|
|---|
| 704 | }
|
|---|
| 705 |
|
|---|
| 706 | void ConversionCost_new::postvisit( const ast::TypeInstType * typeInstType ) {
|
|---|
| 707 | if ( const ast::EqvClass * eqv = env.lookup( typeInstType->name ) ) {
|
|---|
| 708 | cost = costCalc( eqv->bound, dst, symtab, env );
|
|---|
| 709 | } else if ( const ast::TypeInstType * dstAsInst =
|
|---|
| 710 | dynamic_cast< const ast::TypeInstType * >( dst ) ) {
|
|---|
| 711 | if ( typeInstType->name == dstAsInst->name ) {
|
|---|
| 712 | cost = Cost::zero;
|
|---|
| 713 | }
|
|---|
| 714 | } else if ( const ast::NamedTypeDecl * namedType = symtab.lookupType( typeInstType->name ) ) {
|
|---|
| 715 | const ast::TypeDecl * type = dynamic_cast< const ast::TypeDecl * >( namedType );
|
|---|
| 716 | assertf( type, "Unexpected typedef.");
|
|---|
| 717 | if ( type->base ) {
|
|---|
| 718 | cost = costCalc( type->base, dst, symtab, env ) + Cost::safe;
|
|---|
| 719 | }
|
|---|
| 720 | }
|
|---|
| 721 | }
|
|---|
| 722 |
|
|---|
| 723 | void ConversionCost_new::postvisit( const ast::TupleType * tupleType ) {
|
|---|
| 724 | Cost c = Cost::zero;
|
|---|
| 725 | if ( const ast::TupleType * dstAsTuple = dynamic_cast< const ast::TupleType * >( dst ) ) {
|
|---|
| 726 | auto srcIt = tupleType->types.begin();
|
|---|
| 727 | auto dstIt = dstAsTuple->types.begin();
|
|---|
| 728 | auto srcEnd = tupleType->types.end();
|
|---|
| 729 | auto dstEnd = dstAsTuple->types.end();
|
|---|
| 730 | while ( srcIt != srcEnd && dstIt != dstEnd ) {
|
|---|
| 731 | Cost newCost = costCalc( *srcIt++, *dstIt++, symtab, env );
|
|---|
| 732 | if ( newCost == Cost::infinity ) {
|
|---|
| 733 | return;
|
|---|
| 734 | }
|
|---|
| 735 | c += newCost;
|
|---|
| 736 | }
|
|---|
| 737 | if ( dstIt != dstEnd ) {
|
|---|
| 738 | cost = Cost::infinity;
|
|---|
| 739 | } else {
|
|---|
| 740 | cost = c;
|
|---|
| 741 | }
|
|---|
| 742 | }
|
|---|
| 743 | }
|
|---|
| 744 |
|
|---|
| 745 | void ConversionCost_new::postvisit( const ast::VarArgsType * varArgsType ) {
|
|---|
| 746 | (void)varArgsType;
|
|---|
| 747 | if ( dynamic_cast< const ast::VarArgsType * >( dst ) ) {
|
|---|
| 748 | cost = Cost::zero;
|
|---|
| 749 | }
|
|---|
| 750 | }
|
|---|
| 751 |
|
|---|
| 752 | void ConversionCost_new::postvisit( const ast::ZeroType * zeroType ) {
|
|---|
| 753 | (void)zeroType;
|
|---|
| 754 | if ( dynamic_cast< const ast::ZeroType * >( dst ) ) {
|
|---|
| 755 | cost = Cost::zero;
|
|---|
| 756 | } else if ( const ast::BasicType * dstAsBasic =
|
|---|
| 757 | dynamic_cast< const ast::BasicType * >( dst ) ) {
|
|---|
| 758 | int tableResult = costMatrix[ ast::BasicType::SignedInt ][ dstAsBasic->kind ];
|
|---|
| 759 | if ( -1 == tableResult ) {
|
|---|
| 760 | cost = Cost::unsafe;
|
|---|
| 761 | } else {
|
|---|
| 762 | cost = Cost::zero;
|
|---|
| 763 | cost.incSafe( tableResult + 1 );
|
|---|
| 764 | cost.incSign( signMatrix[ ast::BasicType::SignedInt ][ dstAsBasic->kind ] );
|
|---|
| 765 | }
|
|---|
| 766 | }
|
|---|
| 767 | }
|
|---|
| 768 |
|
|---|
| 769 | void ConversionCost_new::postvisit( const ast::OneType * oneType ) {
|
|---|
| 770 | (void)oneType;
|
|---|
| 771 | if ( dynamic_cast< const ast::OneType * >( dst ) ) {
|
|---|
| 772 | cost = Cost::zero;
|
|---|
| 773 | } else if ( const ast::BasicType * dstAsBasic =
|
|---|
| 774 | dynamic_cast< const ast::BasicType * >( dst ) ) {
|
|---|
| 775 | int tableResult = costMatrix[ ast::BasicType::SignedInt ][ dstAsBasic->kind ];
|
|---|
| 776 | if ( -1 == tableResult ) {
|
|---|
| 777 | cost = Cost::unsafe;
|
|---|
| 778 | } else {
|
|---|
| 779 | cost = Cost::zero;
|
|---|
| 780 | cost.incSafe( tableResult + 1 );
|
|---|
| 781 | cost.incSign( signMatrix[ ast::BasicType::SignedInt ][ dstAsBasic->kind ] );
|
|---|
| 782 | }
|
|---|
| 783 | } else if ( dynamic_cast< const ast::PointerType * >( dst ) ) {
|
|---|
| 784 | cost = Cost::zero;
|
|---|
| 785 | cost.incSafe( maxIntCost + 2 );
|
|---|
| 786 | }
|
|---|
| 787 | }
|
|---|
| 788 |
|
|---|
| 789 |
|
|---|
| 790 | } // namespace ResolvExpr
|
|---|
| 791 |
|
|---|
| 792 | // Local Variables: //
|
|---|
| 793 | // tab-width: 4 //
|
|---|
| 794 | // mode: c++ //
|
|---|
| 795 | // compile-command: "make install" //
|
|---|
| 796 | // End: //
|
|---|
