[a32b204] | 1 | // |
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| 2 | // Cforall Version 1.0.0 Copyright (C) 2015 University of Waterloo |
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| 3 | // |
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| 4 | // The contents of this file are covered under the licence agreement in the |
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| 5 | // file "LICENCE" distributed with Cforall. |
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| 6 | // |
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[6ed1d4b] | 7 | // AlternativeFinder.cc -- |
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[a32b204] | 8 | // |
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| 9 | // Author : Richard C. Bilson |
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| 10 | // Created On : Sat May 16 23:52:08 2015 |
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[6ed1d4b] | 11 | // Last Modified By : Rob Schluntz |
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| 12 | // Last Modified On : Wed Feb 10 17:00:04 2016 |
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| 13 | // Update Count : 24 |
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[a32b204] | 14 | // |
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| 15 | |
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[51b7345] | 16 | #include <list> |
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| 17 | #include <iterator> |
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| 18 | #include <algorithm> |
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| 19 | #include <functional> |
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| 20 | #include <cassert> |
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| 21 | |
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| 22 | #include "AlternativeFinder.h" |
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| 23 | #include "Alternative.h" |
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| 24 | #include "Cost.h" |
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| 25 | #include "typeops.h" |
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| 26 | #include "Unify.h" |
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| 27 | #include "RenameVars.h" |
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| 28 | #include "SynTree/Type.h" |
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| 29 | #include "SynTree/Declaration.h" |
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| 30 | #include "SynTree/Expression.h" |
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| 31 | #include "SynTree/Initializer.h" |
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| 32 | #include "SynTree/Visitor.h" |
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| 33 | #include "SymTab/Indexer.h" |
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| 34 | #include "SymTab/Mangler.h" |
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| 35 | #include "SynTree/TypeSubstitution.h" |
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| 36 | #include "SymTab/Validate.h" |
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| 37 | #include "Designators/Processor.h" |
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| 38 | #include "Tuples/TupleAssignment.h" |
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| 39 | #include "Tuples/NameMatcher.h" |
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[d3b7937] | 40 | #include "Common/utility.h" |
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[51b7345] | 41 | |
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[b87a5ed] | 42 | extern bool resolvep; |
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[6ed1d4b] | 43 | #define PRINT( text ) if ( resolvep ) { text } |
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[51b7345] | 44 | //#define DEBUG_COST |
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| 45 | |
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| 46 | namespace ResolvExpr { |
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[a32b204] | 47 | Expression *resolveInVoidContext( Expression *expr, const SymTab::Indexer &indexer, TypeEnvironment &env ) { |
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| 48 | CastExpr *castToVoid = new CastExpr( expr ); |
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| 49 | |
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| 50 | AlternativeFinder finder( indexer, env ); |
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| 51 | finder.findWithAdjustment( castToVoid ); |
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| 52 | |
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| 53 | // it's a property of the language that a cast expression has either 1 or 0 interpretations; if it has 0 |
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| 54 | // interpretations, an exception has already been thrown. |
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| 55 | assert( finder.get_alternatives().size() == 1 ); |
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| 56 | CastExpr *newExpr = dynamic_cast< CastExpr* >( finder.get_alternatives().front().expr ); |
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| 57 | assert( newExpr ); |
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| 58 | env = finder.get_alternatives().front().env; |
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| 59 | return newExpr->get_arg()->clone(); |
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| 60 | } |
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| 61 | |
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| 62 | namespace { |
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| 63 | void printAlts( const AltList &list, std::ostream &os, int indent = 0 ) { |
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| 64 | for ( AltList::const_iterator i = list.begin(); i != list.end(); ++i ) { |
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| 65 | i->print( os, indent ); |
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| 66 | os << std::endl; |
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| 67 | } |
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| 68 | } |
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[d9a0e76] | 69 | |
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[a32b204] | 70 | void makeExprList( const AltList &in, std::list< Expression* > &out ) { |
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| 71 | for ( AltList::const_iterator i = in.begin(); i != in.end(); ++i ) { |
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| 72 | out.push_back( i->expr->clone() ); |
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| 73 | } |
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| 74 | } |
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[d9a0e76] | 75 | |
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[a32b204] | 76 | Cost sumCost( const AltList &in ) { |
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| 77 | Cost total; |
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| 78 | for ( AltList::const_iterator i = in.begin(); i != in.end(); ++i ) { |
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| 79 | total += i->cost; |
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| 80 | } |
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| 81 | return total; |
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| 82 | } |
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[d9a0e76] | 83 | |
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[a32b204] | 84 | struct PruneStruct { |
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| 85 | bool isAmbiguous; |
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| 86 | AltList::iterator candidate; |
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| 87 | PruneStruct() {} |
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| 88 | PruneStruct( AltList::iterator candidate ): isAmbiguous( false ), candidate( candidate ) {} |
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| 89 | }; |
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| 90 | |
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[0f19d763] | 91 | /// Prunes a list of alternatives down to those that have the minimum conversion cost for a given return type; skips ambiguous interpretations |
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[a32b204] | 92 | template< typename InputIterator, typename OutputIterator > |
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| 93 | void pruneAlternatives( InputIterator begin, InputIterator end, OutputIterator out, const SymTab::Indexer &indexer ) { |
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| 94 | // select the alternatives that have the minimum conversion cost for a particular set of result types |
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| 95 | std::map< std::string, PruneStruct > selected; |
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| 96 | for ( AltList::iterator candidate = begin; candidate != end; ++candidate ) { |
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| 97 | PruneStruct current( candidate ); |
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| 98 | std::string mangleName; |
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| 99 | for ( std::list< Type* >::const_iterator retType = candidate->expr->get_results().begin(); retType != candidate->expr->get_results().end(); ++retType ) { |
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| 100 | Type *newType = (*retType)->clone(); |
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| 101 | candidate->env.apply( newType ); |
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| 102 | mangleName += SymTab::Mangler::mangle( newType ); |
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| 103 | delete newType; |
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| 104 | } |
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| 105 | std::map< std::string, PruneStruct >::iterator mapPlace = selected.find( mangleName ); |
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| 106 | if ( mapPlace != selected.end() ) { |
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| 107 | if ( candidate->cost < mapPlace->second.candidate->cost ) { |
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| 108 | PRINT( |
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[6ed1d4b] | 109 | std::cerr << "cost " << candidate->cost << " beats " << mapPlace->second.candidate->cost << std::endl; |
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[7c64920] | 110 | ) |
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[0f19d763] | 111 | selected[ mangleName ] = current; |
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[a32b204] | 112 | } else if ( candidate->cost == mapPlace->second.candidate->cost ) { |
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| 113 | PRINT( |
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[6ed1d4b] | 114 | std::cerr << "marking ambiguous" << std::endl; |
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[7c64920] | 115 | ) |
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[0f19d763] | 116 | mapPlace->second.isAmbiguous = true; |
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[a32b204] | 117 | } |
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| 118 | } else { |
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| 119 | selected[ mangleName ] = current; |
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| 120 | } |
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| 121 | } |
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[d9a0e76] | 122 | |
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| 123 | PRINT( |
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[6ed1d4b] | 124 | std::cerr << "there are " << selected.size() << " alternatives before elimination" << std::endl; |
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[7c64920] | 125 | ) |
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[a32b204] | 126 | |
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[0f19d763] | 127 | // accept the alternatives that were unambiguous |
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| 128 | for ( std::map< std::string, PruneStruct >::iterator target = selected.begin(); target != selected.end(); ++target ) { |
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| 129 | if ( ! target->second.isAmbiguous ) { |
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| 130 | Alternative &alt = *target->second.candidate; |
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| 131 | for ( std::list< Type* >::iterator result = alt.expr->get_results().begin(); result != alt.expr->get_results().end(); ++result ) { |
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| 132 | alt.env.applyFree( *result ); |
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[a32b204] | 133 | } |
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[0f19d763] | 134 | *out++ = alt; |
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[a32b204] | 135 | } |
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[0f19d763] | 136 | } |
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[a32b204] | 137 | |
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[d9a0e76] | 138 | } |
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[a32b204] | 139 | |
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| 140 | template< typename InputIterator, typename OutputIterator > |
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| 141 | void findMinCost( InputIterator begin, InputIterator end, OutputIterator out ) { |
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| 142 | AltList alternatives; |
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| 143 | |
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| 144 | // select the alternatives that have the minimum parameter cost |
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| 145 | Cost minCost = Cost::infinity; |
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| 146 | for ( AltList::iterator i = begin; i != end; ++i ) { |
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| 147 | if ( i->cost < minCost ) { |
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| 148 | minCost = i->cost; |
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| 149 | i->cost = i->cvtCost; |
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| 150 | alternatives.clear(); |
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| 151 | alternatives.push_back( *i ); |
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| 152 | } else if ( i->cost == minCost ) { |
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| 153 | i->cost = i->cvtCost; |
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| 154 | alternatives.push_back( *i ); |
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| 155 | } |
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| 156 | } |
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| 157 | std::copy( alternatives.begin(), alternatives.end(), out ); |
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[d9a0e76] | 158 | } |
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| 159 | |
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[a32b204] | 160 | template< typename InputIterator > |
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| 161 | void simpleCombineEnvironments( InputIterator begin, InputIterator end, TypeEnvironment &result ) { |
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| 162 | while ( begin != end ) { |
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| 163 | result.simpleCombine( (*begin++).env ); |
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| 164 | } |
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| 165 | } |
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[d9a0e76] | 166 | |
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[a32b204] | 167 | void renameTypes( Expression *expr ) { |
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| 168 | for ( std::list< Type* >::iterator i = expr->get_results().begin(); i != expr->get_results().end(); ++i ) { |
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| 169 | (*i)->accept( global_renamer ); |
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| 170 | } |
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[d9a0e76] | 171 | } |
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| 172 | } |
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| 173 | |
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[a32b204] | 174 | template< typename InputIterator, typename OutputIterator > |
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| 175 | void AlternativeFinder::findSubExprs( InputIterator begin, InputIterator end, OutputIterator out ) { |
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| 176 | while ( begin != end ) { |
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| 177 | AlternativeFinder finder( indexer, env ); |
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| 178 | finder.findWithAdjustment( *begin ); |
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| 179 | // XXX either this |
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| 180 | //Designators::fixDesignations( finder, (*begin++)->get_argName() ); |
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| 181 | // or XXX this |
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| 182 | begin++; |
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| 183 | PRINT( |
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[6ed1d4b] | 184 | std::cerr << "findSubExprs" << std::endl; |
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| 185 | printAlts( finder.alternatives, std::cerr ); |
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[7c64920] | 186 | ) |
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[0f19d763] | 187 | *out++ = finder; |
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[a32b204] | 188 | } |
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[d9a0e76] | 189 | } |
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| 190 | |
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[a32b204] | 191 | AlternativeFinder::AlternativeFinder( const SymTab::Indexer &indexer, const TypeEnvironment &env ) |
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| 192 | : indexer( indexer ), env( env ) { |
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[d9a0e76] | 193 | } |
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[51b7345] | 194 | |
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[a32b204] | 195 | void AlternativeFinder::find( Expression *expr, bool adjust ) { |
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| 196 | expr->accept( *this ); |
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| 197 | if ( alternatives.empty() ) { |
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| 198 | throw SemanticError( "No reasonable alternatives for expression ", expr ); |
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| 199 | } |
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| 200 | for ( AltList::iterator i = alternatives.begin(); i != alternatives.end(); ++i ) { |
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| 201 | if ( adjust ) { |
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| 202 | adjustExprTypeList( i->expr->get_results().begin(), i->expr->get_results().end(), i->env, indexer ); |
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| 203 | } |
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| 204 | } |
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| 205 | PRINT( |
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[6ed1d4b] | 206 | std::cerr << "alternatives before prune:" << std::endl; |
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| 207 | printAlts( alternatives, std::cerr ); |
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[7c64920] | 208 | ) |
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[0f19d763] | 209 | AltList::iterator oldBegin = alternatives.begin(); |
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[a32b204] | 210 | pruneAlternatives( alternatives.begin(), alternatives.end(), front_inserter( alternatives ), indexer ); |
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| 211 | if ( alternatives.begin() == oldBegin ) { |
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[5f2f2d7] | 212 | std::ostringstream stream; |
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[a32b204] | 213 | stream << "Can't choose between alternatives for expression "; |
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| 214 | expr->print( stream ); |
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| 215 | stream << "Alternatives are:"; |
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| 216 | AltList winners; |
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| 217 | findMinCost( alternatives.begin(), alternatives.end(), back_inserter( winners ) ); |
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| 218 | printAlts( winners, stream, 8 ); |
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[5f2f2d7] | 219 | throw SemanticError( stream.str() ); |
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[a32b204] | 220 | } |
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| 221 | alternatives.erase( oldBegin, alternatives.end() ); |
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| 222 | PRINT( |
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[6ed1d4b] | 223 | std::cerr << "there are " << alternatives.size() << " alternatives after elimination" << std::endl; |
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[7c64920] | 224 | ) |
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[0f19d763] | 225 | } |
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[d9a0e76] | 226 | |
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[a32b204] | 227 | void AlternativeFinder::findWithAdjustment( Expression *expr ) { |
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| 228 | find( expr, true ); |
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[d9a0e76] | 229 | } |
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[a32b204] | 230 | |
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| 231 | template< typename StructOrUnionType > |
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| 232 | void AlternativeFinder::addAggMembers( StructOrUnionType *aggInst, Expression *expr, const Cost &newCost, const std::string &name ) { |
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| 233 | std::list< Declaration* > members; |
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| 234 | aggInst->lookup( name, members ); |
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| 235 | for ( std::list< Declaration* >::const_iterator i = members.begin(); i != members.end(); ++i ) { |
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| 236 | if ( DeclarationWithType *dwt = dynamic_cast< DeclarationWithType* >( *i ) ) { |
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| 237 | alternatives.push_back( Alternative( new MemberExpr( dwt->clone(), expr->clone() ), env, newCost ) ); |
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| 238 | renameTypes( alternatives.back().expr ); |
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| 239 | } else { |
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| 240 | assert( false ); |
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| 241 | } |
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| 242 | } |
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[d9a0e76] | 243 | } |
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[a32b204] | 244 | |
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| 245 | void AlternativeFinder::visit( ApplicationExpr *applicationExpr ) { |
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| 246 | alternatives.push_back( Alternative( applicationExpr->clone(), env, Cost::zero ) ); |
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[d9a0e76] | 247 | } |
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| 248 | |
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[a32b204] | 249 | Cost computeConversionCost( Alternative &alt, const SymTab::Indexer &indexer ) { |
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| 250 | ApplicationExpr *appExpr = dynamic_cast< ApplicationExpr* >( alt.expr ); |
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| 251 | assert( appExpr ); |
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| 252 | PointerType *pointer = dynamic_cast< PointerType* >( appExpr->get_function()->get_results().front() ); |
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| 253 | assert( pointer ); |
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| 254 | FunctionType *function = dynamic_cast< FunctionType* >( pointer->get_base() ); |
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| 255 | assert( function ); |
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| 256 | |
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| 257 | Cost convCost( 0, 0, 0 ); |
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| 258 | std::list< DeclarationWithType* >& formals = function->get_parameters(); |
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| 259 | std::list< DeclarationWithType* >::iterator formal = formals.begin(); |
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| 260 | std::list< Expression* >& actuals = appExpr->get_args(); |
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| 261 | for ( std::list< Expression* >::iterator actualExpr = actuals.begin(); actualExpr != actuals.end(); ++actualExpr ) { |
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| 262 | PRINT( |
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[6ed1d4b] | 263 | std::cerr << "actual expression:" << std::endl; |
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| 264 | (*actualExpr)->print( std::cerr, 8 ); |
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| 265 | std::cerr << "--- results are" << std::endl; |
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| 266 | printAll( (*actualExpr)->get_results(), std::cerr, 8 ); |
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[7c64920] | 267 | ) |
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| 268 | std::list< DeclarationWithType* >::iterator startFormal = formal; |
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[a32b204] | 269 | Cost actualCost; |
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| 270 | for ( std::list< Type* >::iterator actual = (*actualExpr)->get_results().begin(); actual != (*actualExpr)->get_results().end(); ++actual ) { |
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| 271 | if ( formal == formals.end() ) { |
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| 272 | if ( function->get_isVarArgs() ) { |
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| 273 | convCost += Cost( 1, 0, 0 ); |
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| 274 | break; |
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| 275 | } else { |
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| 276 | return Cost::infinity; |
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| 277 | } |
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| 278 | } |
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| 279 | PRINT( |
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[6ed1d4b] | 280 | std::cerr << std::endl << "converting "; |
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| 281 | (*actual)->print( std::cerr, 8 ); |
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| 282 | std::cerr << std::endl << " to "; |
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| 283 | (*formal)->get_type()->print( std::cerr, 8 ); |
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[7c64920] | 284 | ) |
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| 285 | Cost newCost = conversionCost( *actual, (*formal)->get_type(), indexer, alt.env ); |
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[a32b204] | 286 | PRINT( |
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[6ed1d4b] | 287 | std::cerr << std::endl << "cost is" << newCost << std::endl; |
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[7c64920] | 288 | ) |
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[a32b204] | 289 | |
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[7c64920] | 290 | if ( newCost == Cost::infinity ) { |
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| 291 | return newCost; |
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| 292 | } |
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[a32b204] | 293 | convCost += newCost; |
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| 294 | actualCost += newCost; |
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| 295 | |
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| 296 | convCost += Cost( 0, polyCost( (*formal)->get_type(), alt.env, indexer ) + polyCost( *actual, alt.env, indexer ), 0 ); |
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| 297 | |
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| 298 | formal++; |
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| 299 | } |
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| 300 | if ( actualCost != Cost( 0, 0, 0 ) ) { |
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| 301 | std::list< DeclarationWithType* >::iterator startFormalPlusOne = startFormal; |
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| 302 | startFormalPlusOne++; |
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| 303 | if ( formal == startFormalPlusOne ) { |
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| 304 | // not a tuple type |
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| 305 | Type *newType = (*startFormal)->get_type()->clone(); |
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| 306 | alt.env.apply( newType ); |
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| 307 | *actualExpr = new CastExpr( *actualExpr, newType ); |
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| 308 | } else { |
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| 309 | TupleType *newType = new TupleType( Type::Qualifiers() ); |
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| 310 | for ( std::list< DeclarationWithType* >::iterator i = startFormal; i != formal; ++i ) { |
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| 311 | newType->get_types().push_back( (*i)->get_type()->clone() ); |
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| 312 | } |
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| 313 | alt.env.apply( newType ); |
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| 314 | *actualExpr = new CastExpr( *actualExpr, newType ); |
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| 315 | } |
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| 316 | } |
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| 317 | |
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[d9a0e76] | 318 | } |
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[a32b204] | 319 | if ( formal != formals.end() ) { |
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| 320 | return Cost::infinity; |
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[d9a0e76] | 321 | } |
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| 322 | |
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[a32b204] | 323 | for ( InferredParams::const_iterator assert = appExpr->get_inferParams().begin(); assert != appExpr->get_inferParams().end(); ++assert ) { |
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| 324 | PRINT( |
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[6ed1d4b] | 325 | std::cerr << std::endl << "converting "; |
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| 326 | assert->second.actualType->print( std::cerr, 8 ); |
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| 327 | std::cerr << std::endl << " to "; |
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| 328 | assert->second.formalType->print( std::cerr, 8 ); |
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[a32b204] | 329 | ) |
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| 330 | Cost newCost = conversionCost( assert->second.actualType, assert->second.formalType, indexer, alt.env ); |
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| 331 | PRINT( |
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[6ed1d4b] | 332 | std::cerr << std::endl << "cost of conversion is " << newCost << std::endl; |
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[a32b204] | 333 | ) |
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| 334 | if ( newCost == Cost::infinity ) { |
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| 335 | return newCost; |
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| 336 | } |
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| 337 | convCost += newCost; |
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[d9a0e76] | 338 | |
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[a32b204] | 339 | convCost += Cost( 0, polyCost( assert->second.formalType, alt.env, indexer ) + polyCost( assert->second.actualType, alt.env, indexer ), 0 ); |
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| 340 | } |
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[d9a0e76] | 341 | |
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[a32b204] | 342 | return convCost; |
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| 343 | } |
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[d9a0e76] | 344 | |
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[8c84ebd] | 345 | /// Adds type variables to the open variable set and marks their assertions |
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[a32b204] | 346 | void makeUnifiableVars( Type *type, OpenVarSet &unifiableVars, AssertionSet &needAssertions ) { |
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| 347 | for ( std::list< TypeDecl* >::const_iterator tyvar = type->get_forall().begin(); tyvar != type->get_forall().end(); ++tyvar ) { |
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| 348 | unifiableVars[ (*tyvar)->get_name() ] = (*tyvar)->get_kind(); |
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| 349 | for ( std::list< DeclarationWithType* >::iterator assert = (*tyvar)->get_assertions().begin(); assert != (*tyvar)->get_assertions().end(); ++assert ) { |
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| 350 | needAssertions[ *assert ] = true; |
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| 351 | } |
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[d9a0e76] | 352 | /// needAssertions.insert( needAssertions.end(), (*tyvar)->get_assertions().begin(), (*tyvar)->get_assertions().end() ); |
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| 353 | } |
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| 354 | } |
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[a32b204] | 355 | |
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| 356 | bool AlternativeFinder::instantiateFunction( std::list< DeclarationWithType* >& formals, /*const*/ AltList &actuals, bool isVarArgs, OpenVarSet& openVars, TypeEnvironment &resultEnv, AssertionSet &resultNeed, AssertionSet &resultHave ) { |
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| 357 | simpleCombineEnvironments( actuals.begin(), actuals.end(), resultEnv ); |
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| 358 | // make sure we don't widen any existing bindings |
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| 359 | for ( TypeEnvironment::iterator i = resultEnv.begin(); i != resultEnv.end(); ++i ) { |
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| 360 | i->allowWidening = false; |
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| 361 | } |
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| 362 | resultEnv.extractOpenVars( openVars ); |
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| 363 | |
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| 364 | /* |
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| 365 | Tuples::NameMatcher matcher( formals ); |
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| 366 | try { |
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| 367 | matcher.match( actuals ); |
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| 368 | } catch ( Tuples::NoMatch &e ) { |
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| 369 | std::cerr << "Alternative doesn't match: " << e.message << std::endl; |
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| 370 | } |
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| 371 | */ |
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| 372 | std::list< DeclarationWithType* >::iterator formal = formals.begin(); |
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| 373 | for ( AltList::const_iterator actualExpr = actuals.begin(); actualExpr != actuals.end(); ++actualExpr ) { |
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| 374 | for ( std::list< Type* >::iterator actual = actualExpr->expr->get_results().begin(); actual != actualExpr->expr->get_results().end(); ++actual ) { |
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| 375 | if ( formal == formals.end() ) { |
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| 376 | return isVarArgs; |
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| 377 | } |
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| 378 | PRINT( |
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| 379 | std::cerr << "formal type is "; |
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| 380 | (*formal)->get_type()->print( std::cerr ); |
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| 381 | std::cerr << std::endl << "actual type is "; |
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| 382 | (*actual)->print( std::cerr ); |
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| 383 | std::cerr << std::endl; |
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[7c64920] | 384 | ) |
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[0f19d763] | 385 | if ( ! unify( (*formal)->get_type(), *actual, resultEnv, resultNeed, resultHave, openVars, indexer ) ) { |
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| 386 | return false; |
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| 387 | } |
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[d9a0e76] | 388 | formal++; |
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[a32b204] | 389 | } |
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| 390 | } |
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| 391 | // Handling of default values |
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| 392 | while ( formal != formals.end() ) { |
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| 393 | if ( ObjectDecl *od = dynamic_cast<ObjectDecl *>( *formal ) ) |
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| 394 | if ( SingleInit *si = dynamic_cast<SingleInit *>( od->get_init() )) |
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| 395 | // so far, only constant expressions are accepted as default values |
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| 396 | if ( ConstantExpr *cnstexpr = dynamic_cast<ConstantExpr *>( si->get_value()) ) |
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| 397 | if ( Constant *cnst = dynamic_cast<Constant *>( cnstexpr->get_constant() ) ) |
---|
| 398 | if ( unify( (*formal)->get_type(), cnst->get_type(), resultEnv, resultNeed, resultHave, openVars, indexer ) ) { |
---|
| 399 | // XXX Don't know if this is right |
---|
| 400 | actuals.push_back( Alternative( cnstexpr->clone(), env, Cost::zero ) ); |
---|
| 401 | formal++; |
---|
| 402 | if ( formal == formals.end()) break; |
---|
| 403 | } |
---|
| 404 | return false; |
---|
| 405 | } |
---|
| 406 | return true; |
---|
[d9a0e76] | 407 | } |
---|
[51b7345] | 408 | |
---|
[a32b204] | 409 | static const int recursionLimit = 10; |
---|
[51b7345] | 410 | |
---|
[a32b204] | 411 | void addToIndexer( AssertionSet &assertSet, SymTab::Indexer &indexer ) { |
---|
| 412 | for ( AssertionSet::iterator i = assertSet.begin(); i != assertSet.end(); ++i ) { |
---|
| 413 | if ( i->second == true ) { |
---|
| 414 | i->first->accept( indexer ); |
---|
| 415 | } |
---|
| 416 | } |
---|
[d9a0e76] | 417 | } |
---|
| 418 | |
---|
[a32b204] | 419 | template< typename ForwardIterator, typename OutputIterator > |
---|
| 420 | void inferRecursive( ForwardIterator begin, ForwardIterator end, const Alternative &newAlt, OpenVarSet &openVars, const SymTab::Indexer &decls, const AssertionSet &newNeed, int level, const SymTab::Indexer &indexer, OutputIterator out ) { |
---|
| 421 | if ( begin == end ) { |
---|
| 422 | if ( newNeed.empty() ) { |
---|
| 423 | *out++ = newAlt; |
---|
| 424 | return; |
---|
| 425 | } else if ( level >= recursionLimit ) { |
---|
| 426 | throw SemanticError( "Too many recursive assertions" ); |
---|
| 427 | } else { |
---|
| 428 | AssertionSet newerNeed; |
---|
| 429 | PRINT( |
---|
| 430 | std::cerr << "recursing with new set:" << std::endl; |
---|
| 431 | printAssertionSet( newNeed, std::cerr, 8 ); |
---|
[7c64920] | 432 | ) |
---|
[0f19d763] | 433 | inferRecursive( newNeed.begin(), newNeed.end(), newAlt, openVars, decls, newerNeed, level+1, indexer, out ); |
---|
[a32b204] | 434 | return; |
---|
| 435 | } |
---|
| 436 | } |
---|
| 437 | |
---|
| 438 | ForwardIterator cur = begin++; |
---|
| 439 | if ( ! cur->second ) { |
---|
| 440 | inferRecursive( begin, end, newAlt, openVars, decls, newNeed, level, indexer, out ); |
---|
| 441 | } |
---|
| 442 | DeclarationWithType *curDecl = cur->first; |
---|
[d9a0e76] | 443 | PRINT( |
---|
[a32b204] | 444 | std::cerr << "inferRecursive: assertion is "; |
---|
| 445 | curDecl->print( std::cerr ); |
---|
| 446 | std::cerr << std::endl; |
---|
[7c64920] | 447 | ) |
---|
[0f19d763] | 448 | std::list< DeclarationWithType* > candidates; |
---|
[a32b204] | 449 | decls.lookupId( curDecl->get_name(), candidates ); |
---|
[6ed1d4b] | 450 | /// if ( candidates.empty() ) { std::cerr << "no candidates!" << std::endl; } |
---|
[a32b204] | 451 | for ( std::list< DeclarationWithType* >::const_iterator candidate = candidates.begin(); candidate != candidates.end(); ++candidate ) { |
---|
| 452 | PRINT( |
---|
[6ed1d4b] | 453 | std::cerr << "inferRecursive: candidate is "; |
---|
| 454 | (*candidate)->print( std::cerr ); |
---|
| 455 | std::cerr << std::endl; |
---|
[7c64920] | 456 | ) |
---|
[0f19d763] | 457 | AssertionSet newHave, newerNeed( newNeed ); |
---|
[a32b204] | 458 | TypeEnvironment newEnv( newAlt.env ); |
---|
| 459 | OpenVarSet newOpenVars( openVars ); |
---|
| 460 | Type *adjType = (*candidate)->get_type()->clone(); |
---|
| 461 | adjustExprType( adjType, newEnv, indexer ); |
---|
| 462 | adjType->accept( global_renamer ); |
---|
| 463 | PRINT( |
---|
| 464 | std::cerr << "unifying "; |
---|
| 465 | curDecl->get_type()->print( std::cerr ); |
---|
| 466 | std::cerr << " with "; |
---|
| 467 | adjType->print( std::cerr ); |
---|
| 468 | std::cerr << std::endl; |
---|
[7c64920] | 469 | ) |
---|
[0f19d763] | 470 | if ( unify( curDecl->get_type(), adjType, newEnv, newerNeed, newHave, newOpenVars, indexer ) ) { |
---|
| 471 | PRINT( |
---|
| 472 | std::cerr << "success!" << std::endl; |
---|
[a32b204] | 473 | ) |
---|
[0f19d763] | 474 | SymTab::Indexer newDecls( decls ); |
---|
| 475 | addToIndexer( newHave, newDecls ); |
---|
| 476 | Alternative newerAlt( newAlt ); |
---|
| 477 | newerAlt.env = newEnv; |
---|
| 478 | assert( (*candidate)->get_uniqueId() ); |
---|
| 479 | Expression *varExpr = new VariableExpr( static_cast< DeclarationWithType* >( Declaration::declFromId( (*candidate)->get_uniqueId() ) ) ); |
---|
| 480 | deleteAll( varExpr->get_results() ); |
---|
| 481 | varExpr->get_results().clear(); |
---|
| 482 | varExpr->get_results().push_front( adjType->clone() ); |
---|
| 483 | PRINT( |
---|
[6ed1d4b] | 484 | std::cerr << "satisfying assertion " << curDecl->get_uniqueId() << " "; |
---|
| 485 | curDecl->print( std::cerr ); |
---|
| 486 | std::cerr << " with declaration " << (*candidate)->get_uniqueId() << " "; |
---|
| 487 | (*candidate)->print( std::cerr ); |
---|
| 488 | std::cerr << std::endl; |
---|
[7c64920] | 489 | ) |
---|
[0f19d763] | 490 | ApplicationExpr *appExpr = static_cast< ApplicationExpr* >( newerAlt.expr ); |
---|
| 491 | // XXX: this is a memory leak, but adjType can't be deleted because it might contain assertions |
---|
| 492 | appExpr->get_inferParams()[ curDecl->get_uniqueId() ] = ParamEntry( (*candidate)->get_uniqueId(), adjType->clone(), curDecl->get_type()->clone(), varExpr ); |
---|
| 493 | inferRecursive( begin, end, newerAlt, newOpenVars, newDecls, newerNeed, level, indexer, out ); |
---|
| 494 | } else { |
---|
| 495 | delete adjType; |
---|
| 496 | } |
---|
[a32b204] | 497 | } |
---|
[d9a0e76] | 498 | } |
---|
| 499 | |
---|
[a32b204] | 500 | template< typename OutputIterator > |
---|
| 501 | void AlternativeFinder::inferParameters( const AssertionSet &need, AssertionSet &have, const Alternative &newAlt, OpenVarSet &openVars, OutputIterator out ) { |
---|
[d9a0e76] | 502 | // PRINT( |
---|
[6ed1d4b] | 503 | // std::cerr << "inferParameters: assertions needed are" << std::endl; |
---|
| 504 | // printAll( need, std::cerr, 8 ); |
---|
[d9a0e76] | 505 | // ) |
---|
[a32b204] | 506 | SymTab::Indexer decls( indexer ); |
---|
| 507 | PRINT( |
---|
[6ed1d4b] | 508 | std::cerr << "============= original indexer" << std::endl; |
---|
| 509 | indexer.print( std::cerr ); |
---|
| 510 | std::cerr << "============= new indexer" << std::endl; |
---|
| 511 | decls.print( std::cerr ); |
---|
[7c64920] | 512 | ) |
---|
[0f19d763] | 513 | addToIndexer( have, decls ); |
---|
[a32b204] | 514 | AssertionSet newNeed; |
---|
| 515 | inferRecursive( need.begin(), need.end(), newAlt, openVars, decls, newNeed, 0, indexer, out ); |
---|
[d9a0e76] | 516 | // PRINT( |
---|
[6ed1d4b] | 517 | // std::cerr << "declaration 14 is "; |
---|
[d9a0e76] | 518 | // Declaration::declFromId |
---|
| 519 | // *out++ = newAlt; |
---|
| 520 | // ) |
---|
| 521 | } |
---|
| 522 | |
---|
[a32b204] | 523 | template< typename OutputIterator > |
---|
| 524 | void AlternativeFinder::makeFunctionAlternatives( const Alternative &func, FunctionType *funcType, AltList &actualAlt, OutputIterator out ) { |
---|
| 525 | OpenVarSet openVars; |
---|
| 526 | AssertionSet resultNeed, resultHave; |
---|
| 527 | TypeEnvironment resultEnv; |
---|
| 528 | makeUnifiableVars( funcType, openVars, resultNeed ); |
---|
| 529 | if ( instantiateFunction( funcType->get_parameters(), actualAlt, funcType->get_isVarArgs(), openVars, resultEnv, resultNeed, resultHave ) ) { |
---|
| 530 | ApplicationExpr *appExpr = new ApplicationExpr( func.expr->clone() ); |
---|
| 531 | Alternative newAlt( appExpr, resultEnv, sumCost( actualAlt ) ); |
---|
| 532 | makeExprList( actualAlt, appExpr->get_args() ); |
---|
| 533 | PRINT( |
---|
[6ed1d4b] | 534 | std::cerr << "need assertions:" << std::endl; |
---|
| 535 | printAssertionSet( resultNeed, std::cerr, 8 ); |
---|
[7c64920] | 536 | ) |
---|
[0f19d763] | 537 | inferParameters( resultNeed, resultHave, newAlt, openVars, out ); |
---|
[d9a0e76] | 538 | } |
---|
| 539 | } |
---|
| 540 | |
---|
[a32b204] | 541 | void AlternativeFinder::visit( UntypedExpr *untypedExpr ) { |
---|
| 542 | bool doneInit = false; |
---|
| 543 | AlternativeFinder funcOpFinder( indexer, env ); |
---|
[d9a0e76] | 544 | |
---|
[6ed1d4b] | 545 | AlternativeFinder funcFinder( indexer, env ); |
---|
| 546 | |
---|
| 547 | { |
---|
[2871210] | 548 | NameExpr *fname = 0;; |
---|
[a32b204] | 549 | if ( ( fname = dynamic_cast<NameExpr *>( untypedExpr->get_function())) |
---|
[de62360d] | 550 | && ( fname->get_name() == std::string("&&")) ) { |
---|
[2871210] | 551 | VoidType v = Type::Qualifiers(); // resolve to type void * |
---|
| 552 | PointerType pt( Type::Qualifiers(), v.clone() ); |
---|
| 553 | UntypedExpr *vexpr = untypedExpr->clone(); |
---|
| 554 | vexpr->get_results().push_front( pt.clone() ); |
---|
| 555 | alternatives.push_back( Alternative( vexpr, env, Cost()) ); |
---|
[a32b204] | 556 | return; |
---|
| 557 | } |
---|
| 558 | } |
---|
[d9a0e76] | 559 | |
---|
[a32b204] | 560 | funcFinder.findWithAdjustment( untypedExpr->get_function() ); |
---|
| 561 | std::list< AlternativeFinder > argAlternatives; |
---|
| 562 | findSubExprs( untypedExpr->begin_args(), untypedExpr->end_args(), back_inserter( argAlternatives ) ); |
---|
[d9a0e76] | 563 | |
---|
[a32b204] | 564 | std::list< AltList > possibilities; |
---|
| 565 | combos( argAlternatives.begin(), argAlternatives.end(), back_inserter( possibilities ) ); |
---|
[d9a0e76] | 566 | |
---|
[a32b204] | 567 | Tuples::TupleAssignSpotter tassign( this ); |
---|
| 568 | if ( tassign.isTupleAssignment( untypedExpr, possibilities ) ) { |
---|
| 569 | // take care of possible tuple assignments, or discard expression |
---|
| 570 | return; |
---|
| 571 | } // else ... |
---|
[d9a0e76] | 572 | |
---|
[a32b204] | 573 | AltList candidates; |
---|
[91b8a17] | 574 | SemanticError errors; |
---|
[d9a0e76] | 575 | |
---|
[a32b204] | 576 | for ( AltList::const_iterator func = funcFinder.alternatives.begin(); func != funcFinder.alternatives.end(); ++func ) { |
---|
[91b8a17] | 577 | try { |
---|
| 578 | PRINT( |
---|
| 579 | std::cerr << "working on alternative: " << std::endl; |
---|
| 580 | func->print( std::cerr, 8 ); |
---|
| 581 | ) |
---|
| 582 | // check if the type is pointer to function |
---|
| 583 | PointerType *pointer; |
---|
| 584 | if ( func->expr->get_results().size() == 1 && ( pointer = dynamic_cast< PointerType* >( func->expr->get_results().front() ) ) ) { |
---|
| 585 | if ( FunctionType *function = dynamic_cast< FunctionType* >( pointer->get_base() ) ) { |
---|
| 586 | for ( std::list< AltList >::iterator actualAlt = possibilities.begin(); actualAlt != possibilities.end(); ++actualAlt ) { |
---|
| 587 | // XXX |
---|
| 588 | //Designators::check_alternative( function, *actualAlt ); |
---|
| 589 | makeFunctionAlternatives( *func, function, *actualAlt, std::back_inserter( candidates ) ); |
---|
| 590 | } |
---|
| 591 | } else if ( TypeInstType *typeInst = dynamic_cast< TypeInstType* >( pointer->get_base() ) ) { |
---|
| 592 | EqvClass eqvClass; |
---|
| 593 | if ( func->env.lookup( typeInst->get_name(), eqvClass ) && eqvClass.type ) { |
---|
| 594 | if ( FunctionType *function = dynamic_cast< FunctionType* >( eqvClass.type ) ) { |
---|
| 595 | for ( std::list< AltList >::iterator actualAlt = possibilities.begin(); actualAlt != possibilities.end(); ++actualAlt ) { |
---|
| 596 | makeFunctionAlternatives( *func, function, *actualAlt, std::back_inserter( candidates ) ); |
---|
| 597 | } // for |
---|
| 598 | } // if |
---|
[a32b204] | 599 | } // if |
---|
| 600 | } // if |
---|
[91b8a17] | 601 | } else { |
---|
| 602 | // seek a function operator that's compatible |
---|
| 603 | if ( ! doneInit ) { |
---|
| 604 | doneInit = true; |
---|
| 605 | NameExpr *opExpr = new NameExpr( "?()" ); |
---|
| 606 | try { |
---|
| 607 | funcOpFinder.findWithAdjustment( opExpr ); |
---|
| 608 | } catch( SemanticError &e ) { |
---|
| 609 | // it's ok if there aren't any defined function ops |
---|
| 610 | } |
---|
| 611 | PRINT( |
---|
| 612 | std::cerr << "known function ops:" << std::endl; |
---|
| 613 | printAlts( funcOpFinder.alternatives, std::cerr, 8 ); |
---|
| 614 | ) |
---|
[a32b204] | 615 | } |
---|
| 616 | |
---|
[91b8a17] | 617 | for ( AltList::const_iterator funcOp = funcOpFinder.alternatives.begin(); funcOp != funcOpFinder.alternatives.end(); ++funcOp ) { |
---|
| 618 | // check if the type is pointer to function |
---|
| 619 | PointerType *pointer; |
---|
| 620 | if ( funcOp->expr->get_results().size() == 1 |
---|
| 621 | && ( pointer = dynamic_cast< PointerType* >( funcOp->expr->get_results().front() ) ) ) { |
---|
| 622 | if ( FunctionType *function = dynamic_cast< FunctionType* >( pointer->get_base() ) ) { |
---|
| 623 | for ( std::list< AltList >::iterator actualAlt = possibilities.begin(); actualAlt != possibilities.end(); ++actualAlt ) { |
---|
| 624 | AltList currentAlt; |
---|
| 625 | currentAlt.push_back( *func ); |
---|
| 626 | currentAlt.insert( currentAlt.end(), actualAlt->begin(), actualAlt->end() ); |
---|
| 627 | makeFunctionAlternatives( *funcOp, function, currentAlt, std::back_inserter( candidates ) ); |
---|
| 628 | } // for |
---|
| 629 | } // if |
---|
[a32b204] | 630 | } // if |
---|
[91b8a17] | 631 | } // for |
---|
| 632 | } // if |
---|
| 633 | } catch ( SemanticError &e ) { |
---|
| 634 | errors.append( e ); |
---|
| 635 | } |
---|
[a32b204] | 636 | } // for |
---|
| 637 | |
---|
[91b8a17] | 638 | // Implement SFINAE; resolution errors are only errors if there aren't any non-erroneous resolutions |
---|
| 639 | if ( candidates.empty() && ! errors.isEmpty() ) { throw errors; } |
---|
| 640 | |
---|
[a32b204] | 641 | for ( AltList::iterator withFunc = candidates.begin(); withFunc != candidates.end(); ++withFunc ) { |
---|
| 642 | Cost cvtCost = computeConversionCost( *withFunc, indexer ); |
---|
| 643 | |
---|
| 644 | PRINT( |
---|
| 645 | ApplicationExpr *appExpr = dynamic_cast< ApplicationExpr* >( withFunc->expr ); |
---|
| 646 | assert( appExpr ); |
---|
| 647 | PointerType *pointer = dynamic_cast< PointerType* >( appExpr->get_function()->get_results().front() ); |
---|
| 648 | assert( pointer ); |
---|
| 649 | FunctionType *function = dynamic_cast< FunctionType* >( pointer->get_base() ); |
---|
| 650 | assert( function ); |
---|
[6ed1d4b] | 651 | std::cerr << "Case +++++++++++++" << std::endl; |
---|
| 652 | std::cerr << "formals are:" << std::endl; |
---|
| 653 | printAll( function->get_parameters(), std::cerr, 8 ); |
---|
| 654 | std::cerr << "actuals are:" << std::endl; |
---|
| 655 | printAll( appExpr->get_args(), std::cerr, 8 ); |
---|
| 656 | std::cerr << "bindings are:" << std::endl; |
---|
| 657 | withFunc->env.print( std::cerr, 8 ); |
---|
| 658 | std::cerr << "cost of conversion is:" << cvtCost << std::endl; |
---|
[7c64920] | 659 | ) |
---|
| 660 | if ( cvtCost != Cost::infinity ) { |
---|
| 661 | withFunc->cvtCost = cvtCost; |
---|
| 662 | alternatives.push_back( *withFunc ); |
---|
| 663 | } // if |
---|
[a32b204] | 664 | } // for |
---|
| 665 | candidates.clear(); |
---|
| 666 | candidates.splice( candidates.end(), alternatives ); |
---|
| 667 | |
---|
| 668 | findMinCost( candidates.begin(), candidates.end(), std::back_inserter( alternatives ) ); |
---|
| 669 | } |
---|
| 670 | |
---|
| 671 | bool isLvalue( Expression *expr ) { |
---|
| 672 | for ( std::list< Type* >::const_iterator i = expr->get_results().begin(); i != expr->get_results().end(); ++i ) { |
---|
| 673 | if ( !(*i)->get_isLvalue() ) return false; |
---|
| 674 | } // for |
---|
| 675 | return true; |
---|
| 676 | } |
---|
| 677 | |
---|
| 678 | void AlternativeFinder::visit( AddressExpr *addressExpr ) { |
---|
| 679 | AlternativeFinder finder( indexer, env ); |
---|
| 680 | finder.find( addressExpr->get_arg() ); |
---|
| 681 | for ( std::list< Alternative >::iterator i = finder.alternatives.begin(); i != finder.alternatives.end(); ++i ) { |
---|
| 682 | if ( isLvalue( i->expr ) ) { |
---|
| 683 | alternatives.push_back( Alternative( new AddressExpr( i->expr->clone() ), i->env, i->cost ) ); |
---|
| 684 | } // if |
---|
| 685 | } // for |
---|
| 686 | } |
---|
| 687 | |
---|
| 688 | void AlternativeFinder::visit( CastExpr *castExpr ) { |
---|
| 689 | for ( std::list< Type* >::iterator i = castExpr->get_results().begin(); i != castExpr->get_results().end(); ++i ) { |
---|
| 690 | SymTab::validateType( *i, &indexer ); |
---|
| 691 | adjustExprType( *i, env, indexer ); |
---|
| 692 | } // for |
---|
| 693 | |
---|
| 694 | AlternativeFinder finder( indexer, env ); |
---|
| 695 | finder.findWithAdjustment( castExpr->get_arg() ); |
---|
| 696 | |
---|
| 697 | AltList candidates; |
---|
| 698 | for ( std::list< Alternative >::iterator i = finder.alternatives.begin(); i != finder.alternatives.end(); ++i ) { |
---|
| 699 | AssertionSet needAssertions, haveAssertions; |
---|
| 700 | OpenVarSet openVars; |
---|
| 701 | |
---|
| 702 | // It's possible that a cast can throw away some values in a multiply-valued expression. (An example is a |
---|
| 703 | // cast-to-void, which casts from one value to zero.) Figure out the prefix of the subexpression results |
---|
| 704 | // that are cast directly. The candidate is invalid if it has fewer results than there are types to cast |
---|
| 705 | // to. |
---|
| 706 | int discardedValues = (*i).expr->get_results().size() - castExpr->get_results().size(); |
---|
| 707 | if ( discardedValues < 0 ) continue; |
---|
| 708 | std::list< Type* >::iterator candidate_end = (*i).expr->get_results().begin(); |
---|
| 709 | std::advance( candidate_end, castExpr->get_results().size() ); |
---|
[adcdd2f] | 710 | // unification run for side-effects |
---|
| 711 | unifyList( castExpr->get_results().begin(), castExpr->get_results().end(), |
---|
| 712 | (*i).expr->get_results().begin(), candidate_end, |
---|
| 713 | i->env, needAssertions, haveAssertions, openVars, indexer ); |
---|
[a32b204] | 714 | Cost thisCost = castCostList( (*i).expr->get_results().begin(), candidate_end, |
---|
[adcdd2f] | 715 | castExpr->get_results().begin(), castExpr->get_results().end(), |
---|
| 716 | indexer, i->env ); |
---|
[a32b204] | 717 | if ( thisCost != Cost::infinity ) { |
---|
| 718 | // count one safe conversion for each value that is thrown away |
---|
| 719 | thisCost += Cost( 0, 0, discardedValues ); |
---|
| 720 | CastExpr *newExpr = castExpr->clone(); |
---|
| 721 | newExpr->set_arg( i->expr->clone() ); |
---|
| 722 | candidates.push_back( Alternative( newExpr, i->env, i->cost, thisCost ) ); |
---|
| 723 | } // if |
---|
| 724 | } // for |
---|
| 725 | |
---|
| 726 | // findMinCost selects the alternatives with the lowest "cost" members, but has the side effect of copying the |
---|
| 727 | // cvtCost member to the cost member (since the old cost is now irrelevant). Thus, calling findMinCost twice |
---|
| 728 | // selects first based on argument cost, then on conversion cost. |
---|
| 729 | AltList minArgCost; |
---|
| 730 | findMinCost( candidates.begin(), candidates.end(), std::back_inserter( minArgCost ) ); |
---|
| 731 | findMinCost( minArgCost.begin(), minArgCost.end(), std::back_inserter( alternatives ) ); |
---|
| 732 | } |
---|
| 733 | |
---|
| 734 | void AlternativeFinder::visit( UntypedMemberExpr *memberExpr ) { |
---|
| 735 | AlternativeFinder funcFinder( indexer, env ); |
---|
| 736 | funcFinder.findWithAdjustment( memberExpr->get_aggregate() ); |
---|
| 737 | |
---|
| 738 | for ( AltList::const_iterator agg = funcFinder.alternatives.begin(); agg != funcFinder.alternatives.end(); ++agg ) { |
---|
| 739 | if ( agg->expr->get_results().size() == 1 ) { |
---|
| 740 | if ( StructInstType *structInst = dynamic_cast< StructInstType* >( agg->expr->get_results().front() ) ) { |
---|
| 741 | addAggMembers( structInst, agg->expr, agg->cost, memberExpr->get_member() ); |
---|
| 742 | } else if ( UnionInstType *unionInst = dynamic_cast< UnionInstType* >( agg->expr->get_results().front() ) ) { |
---|
| 743 | addAggMembers( unionInst, agg->expr, agg->cost, memberExpr->get_member() ); |
---|
| 744 | } // if |
---|
| 745 | } // if |
---|
| 746 | } // for |
---|
| 747 | } |
---|
| 748 | |
---|
| 749 | void AlternativeFinder::visit( MemberExpr *memberExpr ) { |
---|
| 750 | alternatives.push_back( Alternative( memberExpr->clone(), env, Cost::zero ) ); |
---|
| 751 | } |
---|
| 752 | |
---|
| 753 | void AlternativeFinder::visit( NameExpr *nameExpr ) { |
---|
| 754 | std::list< DeclarationWithType* > declList; |
---|
| 755 | indexer.lookupId( nameExpr->get_name(), declList ); |
---|
| 756 | PRINT( std::cerr << "nameExpr is " << nameExpr->get_name() << std::endl; ) |
---|
[0f19d763] | 757 | for ( std::list< DeclarationWithType* >::iterator i = declList.begin(); i != declList.end(); ++i ) { |
---|
| 758 | VariableExpr newExpr( *i, nameExpr->get_argName() ); |
---|
| 759 | alternatives.push_back( Alternative( newExpr.clone(), env, Cost() ) ); |
---|
| 760 | PRINT( |
---|
| 761 | std::cerr << "decl is "; |
---|
| 762 | (*i)->print( std::cerr ); |
---|
| 763 | std::cerr << std::endl; |
---|
| 764 | std::cerr << "newExpr is "; |
---|
| 765 | newExpr.print( std::cerr ); |
---|
| 766 | std::cerr << std::endl; |
---|
[7c64920] | 767 | ) |
---|
[0f19d763] | 768 | renameTypes( alternatives.back().expr ); |
---|
| 769 | if ( StructInstType *structInst = dynamic_cast< StructInstType* >( (*i)->get_type() ) ) { |
---|
| 770 | addAggMembers( structInst, &newExpr, Cost( 0, 0, 1 ), "" ); |
---|
| 771 | } else if ( UnionInstType *unionInst = dynamic_cast< UnionInstType* >( (*i)->get_type() ) ) { |
---|
| 772 | addAggMembers( unionInst, &newExpr, Cost( 0, 0, 1 ), "" ); |
---|
| 773 | } // if |
---|
| 774 | } // for |
---|
[a32b204] | 775 | } |
---|
| 776 | |
---|
| 777 | void AlternativeFinder::visit( VariableExpr *variableExpr ) { |
---|
| 778 | alternatives.push_back( Alternative( variableExpr->clone(), env, Cost::zero ) ); |
---|
| 779 | } |
---|
| 780 | |
---|
| 781 | void AlternativeFinder::visit( ConstantExpr *constantExpr ) { |
---|
| 782 | alternatives.push_back( Alternative( constantExpr->clone(), env, Cost::zero ) ); |
---|
| 783 | } |
---|
| 784 | |
---|
| 785 | void AlternativeFinder::visit( SizeofExpr *sizeofExpr ) { |
---|
| 786 | if ( sizeofExpr->get_isType() ) { |
---|
| 787 | alternatives.push_back( Alternative( sizeofExpr->clone(), env, Cost::zero ) ); |
---|
| 788 | } else { |
---|
| 789 | // find all alternatives for the argument to sizeof |
---|
| 790 | AlternativeFinder finder( indexer, env ); |
---|
| 791 | finder.find( sizeofExpr->get_expr() ); |
---|
| 792 | // find the lowest cost alternative among the alternatives, otherwise ambiguous |
---|
| 793 | AltList winners; |
---|
| 794 | findMinCost( finder.alternatives.begin(), finder.alternatives.end(), back_inserter( winners ) ); |
---|
| 795 | if ( winners.size() != 1 ) { |
---|
| 796 | throw SemanticError( "Ambiguous expression in sizeof operand: ", sizeofExpr->get_expr() ); |
---|
| 797 | } // if |
---|
| 798 | // return the lowest cost alternative for the argument |
---|
| 799 | Alternative &choice = winners.front(); |
---|
| 800 | alternatives.push_back( Alternative( new SizeofExpr( choice.expr->clone() ), choice.env, Cost::zero ) ); |
---|
[47534159] | 801 | } // if |
---|
| 802 | } |
---|
| 803 | |
---|
| 804 | void AlternativeFinder::visit( AlignofExpr *alignofExpr ) { |
---|
| 805 | if ( alignofExpr->get_isType() ) { |
---|
| 806 | alternatives.push_back( Alternative( alignofExpr->clone(), env, Cost::zero ) ); |
---|
| 807 | } else { |
---|
| 808 | // find all alternatives for the argument to sizeof |
---|
| 809 | AlternativeFinder finder( indexer, env ); |
---|
| 810 | finder.find( alignofExpr->get_expr() ); |
---|
| 811 | // find the lowest cost alternative among the alternatives, otherwise ambiguous |
---|
| 812 | AltList winners; |
---|
| 813 | findMinCost( finder.alternatives.begin(), finder.alternatives.end(), back_inserter( winners ) ); |
---|
| 814 | if ( winners.size() != 1 ) { |
---|
| 815 | throw SemanticError( "Ambiguous expression in alignof operand: ", alignofExpr->get_expr() ); |
---|
| 816 | } // if |
---|
| 817 | // return the lowest cost alternative for the argument |
---|
| 818 | Alternative &choice = winners.front(); |
---|
| 819 | alternatives.push_back( Alternative( new AlignofExpr( choice.expr->clone() ), choice.env, Cost::zero ) ); |
---|
[a32b204] | 820 | } // if |
---|
| 821 | } |
---|
| 822 | |
---|
[2a4b088] | 823 | template< typename StructOrUnionType > |
---|
| 824 | void AlternativeFinder::addOffsetof( StructOrUnionType *aggInst, const std::string &name ) { |
---|
| 825 | std::list< Declaration* > members; |
---|
| 826 | aggInst->lookup( name, members ); |
---|
| 827 | for ( std::list< Declaration* >::const_iterator i = members.begin(); i != members.end(); ++i ) { |
---|
| 828 | if ( DeclarationWithType *dwt = dynamic_cast< DeclarationWithType* >( *i ) ) { |
---|
| 829 | alternatives.push_back( Alternative( new OffsetofExpr( aggInst->clone(), dwt->clone() ), env, Cost::zero ) ); |
---|
| 830 | renameTypes( alternatives.back().expr ); |
---|
| 831 | } else { |
---|
| 832 | assert( false ); |
---|
| 833 | } |
---|
| 834 | } |
---|
| 835 | } |
---|
[6ed1d4b] | 836 | |
---|
[2a4b088] | 837 | void AlternativeFinder::visit( UntypedOffsetofExpr *offsetofExpr ) { |
---|
| 838 | AlternativeFinder funcFinder( indexer, env ); |
---|
| 839 | if ( StructInstType *structInst = dynamic_cast< StructInstType* >( offsetofExpr->get_type() ) ) { |
---|
| 840 | addOffsetof( structInst, offsetofExpr->get_member() ); |
---|
| 841 | } else if ( UnionInstType *unionInst = dynamic_cast< UnionInstType* >( offsetofExpr->get_type() ) ) { |
---|
| 842 | addOffsetof( unionInst, offsetofExpr->get_member() ); |
---|
| 843 | } |
---|
| 844 | } |
---|
[6ed1d4b] | 845 | |
---|
[25a054f] | 846 | void AlternativeFinder::visit( OffsetofExpr *offsetofExpr ) { |
---|
| 847 | alternatives.push_back( Alternative( offsetofExpr->clone(), env, Cost::zero ) ); |
---|
[afc1045] | 848 | } |
---|
| 849 | |
---|
| 850 | void AlternativeFinder::visit( OffsetPackExpr *offsetPackExpr ) { |
---|
| 851 | alternatives.push_back( Alternative( offsetPackExpr->clone(), env, Cost::zero ) ); |
---|
[25a054f] | 852 | } |
---|
| 853 | |
---|
[a32b204] | 854 | void AlternativeFinder::resolveAttr( DeclarationWithType *funcDecl, FunctionType *function, Type *argType, const TypeEnvironment &env ) { |
---|
| 855 | // assume no polymorphism |
---|
| 856 | // assume no implicit conversions |
---|
| 857 | assert( function->get_parameters().size() == 1 ); |
---|
| 858 | PRINT( |
---|
[6ed1d4b] | 859 | std::cerr << "resolvAttr: funcDecl is "; |
---|
| 860 | funcDecl->print( std::cerr ); |
---|
| 861 | std::cerr << " argType is "; |
---|
| 862 | argType->print( std::cerr ); |
---|
| 863 | std::cerr << std::endl; |
---|
[7c64920] | 864 | ) |
---|
| 865 | if ( typesCompatibleIgnoreQualifiers( argType, function->get_parameters().front()->get_type(), indexer, env ) ) { |
---|
| 866 | alternatives.push_back( Alternative( new AttrExpr( new VariableExpr( funcDecl ), argType->clone() ), env, Cost::zero ) ); |
---|
| 867 | for ( std::list< DeclarationWithType* >::iterator i = function->get_returnVals().begin(); i != function->get_returnVals().end(); ++i ) { |
---|
| 868 | alternatives.back().expr->get_results().push_back( (*i)->get_type()->clone() ); |
---|
| 869 | } // for |
---|
| 870 | } // if |
---|
[a32b204] | 871 | } |
---|
| 872 | |
---|
| 873 | void AlternativeFinder::visit( AttrExpr *attrExpr ) { |
---|
| 874 | // assume no 'pointer-to-attribute' |
---|
| 875 | NameExpr *nameExpr = dynamic_cast< NameExpr* >( attrExpr->get_attr() ); |
---|
| 876 | assert( nameExpr ); |
---|
| 877 | std::list< DeclarationWithType* > attrList; |
---|
| 878 | indexer.lookupId( nameExpr->get_name(), attrList ); |
---|
| 879 | if ( attrExpr->get_isType() || attrExpr->get_expr() ) { |
---|
| 880 | for ( std::list< DeclarationWithType* >::iterator i = attrList.begin(); i != attrList.end(); ++i ) { |
---|
| 881 | // check if the type is function |
---|
| 882 | if ( FunctionType *function = dynamic_cast< FunctionType* >( (*i)->get_type() ) ) { |
---|
| 883 | // assume exactly one parameter |
---|
| 884 | if ( function->get_parameters().size() == 1 ) { |
---|
| 885 | if ( attrExpr->get_isType() ) { |
---|
| 886 | resolveAttr( *i, function, attrExpr->get_type(), env ); |
---|
| 887 | } else { |
---|
| 888 | AlternativeFinder finder( indexer, env ); |
---|
| 889 | finder.find( attrExpr->get_expr() ); |
---|
| 890 | for ( AltList::iterator choice = finder.alternatives.begin(); choice != finder.alternatives.end(); ++choice ) { |
---|
| 891 | if ( choice->expr->get_results().size() == 1 ) { |
---|
| 892 | resolveAttr(*i, function, choice->expr->get_results().front(), choice->env ); |
---|
| 893 | } // fi |
---|
| 894 | } // for |
---|
| 895 | } // if |
---|
| 896 | } // if |
---|
| 897 | } // if |
---|
| 898 | } // for |
---|
| 899 | } else { |
---|
| 900 | for ( std::list< DeclarationWithType* >::iterator i = attrList.begin(); i != attrList.end(); ++i ) { |
---|
| 901 | VariableExpr newExpr( *i ); |
---|
| 902 | alternatives.push_back( Alternative( newExpr.clone(), env, Cost() ) ); |
---|
| 903 | renameTypes( alternatives.back().expr ); |
---|
| 904 | } // for |
---|
| 905 | } // if |
---|
| 906 | } |
---|
| 907 | |
---|
| 908 | void AlternativeFinder::visit( LogicalExpr *logicalExpr ) { |
---|
| 909 | AlternativeFinder firstFinder( indexer, env ); |
---|
| 910 | firstFinder.findWithAdjustment( logicalExpr->get_arg1() ); |
---|
| 911 | for ( AltList::const_iterator first = firstFinder.alternatives.begin(); first != firstFinder.alternatives.end(); ++first ) { |
---|
| 912 | AlternativeFinder secondFinder( indexer, first->env ); |
---|
| 913 | secondFinder.findWithAdjustment( logicalExpr->get_arg2() ); |
---|
| 914 | for ( AltList::const_iterator second = secondFinder.alternatives.begin(); second != secondFinder.alternatives.end(); ++second ) { |
---|
| 915 | LogicalExpr *newExpr = new LogicalExpr( first->expr->clone(), second->expr->clone(), logicalExpr->get_isAnd() ); |
---|
| 916 | alternatives.push_back( Alternative( newExpr, second->env, first->cost + second->cost ) ); |
---|
[d9a0e76] | 917 | } |
---|
| 918 | } |
---|
| 919 | } |
---|
[51b7345] | 920 | |
---|
[a32b204] | 921 | void AlternativeFinder::visit( ConditionalExpr *conditionalExpr ) { |
---|
| 922 | AlternativeFinder firstFinder( indexer, env ); |
---|
| 923 | firstFinder.findWithAdjustment( conditionalExpr->get_arg1() ); |
---|
| 924 | for ( AltList::const_iterator first = firstFinder.alternatives.begin(); first != firstFinder.alternatives.end(); ++first ) { |
---|
| 925 | AlternativeFinder secondFinder( indexer, first->env ); |
---|
| 926 | secondFinder.findWithAdjustment( conditionalExpr->get_arg2() ); |
---|
| 927 | for ( AltList::const_iterator second = secondFinder.alternatives.begin(); second != secondFinder.alternatives.end(); ++second ) { |
---|
| 928 | AlternativeFinder thirdFinder( indexer, second->env ); |
---|
| 929 | thirdFinder.findWithAdjustment( conditionalExpr->get_arg3() ); |
---|
| 930 | for ( AltList::const_iterator third = thirdFinder.alternatives.begin(); third != thirdFinder.alternatives.end(); ++third ) { |
---|
| 931 | OpenVarSet openVars; |
---|
| 932 | AssertionSet needAssertions, haveAssertions; |
---|
| 933 | Alternative newAlt( 0, third->env, first->cost + second->cost + third->cost ); |
---|
| 934 | std::list< Type* > commonTypes; |
---|
| 935 | if ( unifyList( second->expr->get_results().begin(), second->expr->get_results().end(), third->expr->get_results().begin(), third->expr->get_results().end(), newAlt.env, needAssertions, haveAssertions, openVars, indexer, commonTypes ) ) { |
---|
| 936 | ConditionalExpr *newExpr = new ConditionalExpr( first->expr->clone(), second->expr->clone(), third->expr->clone() ); |
---|
| 937 | std::list< Type* >::const_iterator original = second->expr->get_results().begin(); |
---|
| 938 | std::list< Type* >::const_iterator commonType = commonTypes.begin(); |
---|
| 939 | for ( ; original != second->expr->get_results().end() && commonType != commonTypes.end(); ++original, ++commonType ) { |
---|
| 940 | if ( *commonType ) { |
---|
| 941 | newExpr->get_results().push_back( *commonType ); |
---|
| 942 | } else { |
---|
| 943 | newExpr->get_results().push_back( (*original)->clone() ); |
---|
| 944 | } // if |
---|
| 945 | } // for |
---|
| 946 | newAlt.expr = newExpr; |
---|
| 947 | inferParameters( needAssertions, haveAssertions, newAlt, openVars, back_inserter( alternatives ) ); |
---|
| 948 | } // if |
---|
| 949 | } // for |
---|
| 950 | } // for |
---|
| 951 | } // for |
---|
| 952 | } |
---|
| 953 | |
---|
| 954 | void AlternativeFinder::visit( CommaExpr *commaExpr ) { |
---|
| 955 | TypeEnvironment newEnv( env ); |
---|
| 956 | Expression *newFirstArg = resolveInVoidContext( commaExpr->get_arg1(), indexer, newEnv ); |
---|
| 957 | AlternativeFinder secondFinder( indexer, newEnv ); |
---|
| 958 | secondFinder.findWithAdjustment( commaExpr->get_arg2() ); |
---|
| 959 | for ( AltList::const_iterator alt = secondFinder.alternatives.begin(); alt != secondFinder.alternatives.end(); ++alt ) { |
---|
| 960 | alternatives.push_back( Alternative( new CommaExpr( newFirstArg->clone(), alt->expr->clone() ), alt->env, alt->cost ) ); |
---|
| 961 | } // for |
---|
| 962 | delete newFirstArg; |
---|
| 963 | } |
---|
| 964 | |
---|
| 965 | void AlternativeFinder::visit( TupleExpr *tupleExpr ) { |
---|
| 966 | std::list< AlternativeFinder > subExprAlternatives; |
---|
| 967 | findSubExprs( tupleExpr->get_exprs().begin(), tupleExpr->get_exprs().end(), back_inserter( subExprAlternatives ) ); |
---|
| 968 | std::list< AltList > possibilities; |
---|
| 969 | combos( subExprAlternatives.begin(), subExprAlternatives.end(), back_inserter( possibilities ) ); |
---|
| 970 | for ( std::list< AltList >::const_iterator i = possibilities.begin(); i != possibilities.end(); ++i ) { |
---|
| 971 | TupleExpr *newExpr = new TupleExpr; |
---|
| 972 | makeExprList( *i, newExpr->get_exprs() ); |
---|
| 973 | for ( std::list< Expression* >::const_iterator resultExpr = newExpr->get_exprs().begin(); resultExpr != newExpr->get_exprs().end(); ++resultExpr ) { |
---|
| 974 | for ( std::list< Type* >::const_iterator resultType = (*resultExpr)->get_results().begin(); resultType != (*resultExpr)->get_results().end(); ++resultType ) { |
---|
| 975 | newExpr->get_results().push_back( (*resultType)->clone() ); |
---|
| 976 | } // for |
---|
| 977 | } // for |
---|
| 978 | |
---|
| 979 | TypeEnvironment compositeEnv; |
---|
| 980 | simpleCombineEnvironments( i->begin(), i->end(), compositeEnv ); |
---|
| 981 | alternatives.push_back( Alternative( newExpr, compositeEnv, sumCost( *i ) ) ); |
---|
| 982 | } // for |
---|
[d9a0e76] | 983 | } |
---|
[51b7345] | 984 | } // namespace ResolvExpr |
---|
[a32b204] | 985 | |
---|
| 986 | // Local Variables: // |
---|
| 987 | // tab-width: 4 // |
---|
| 988 | // mode: c++ // |
---|
| 989 | // compile-command: "make install" // |
---|
| 990 | // End: // |
---|