[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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[b128d3e] | 11 | // Last Modified By : Peter A. Buhr |
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[30ee9efc] | 12 | // Last Modified On : Thu Nov 1 21:00:56 2018 |
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[e99e43f] | 13 | // Update Count : 35 |
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[a32b204] | 14 | // |
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| 15 | |
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[ea6332d] | 16 | #include <algorithm> // for copy |
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[e3e16bc] | 17 | #include <cassert> // for strict_dynamic_cast, assert, assertf |
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[403b388] | 18 | #include <cstddef> // for size_t |
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[ea6332d] | 19 | #include <iostream> // for operator<<, cerr, ostream, endl |
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| 20 | #include <iterator> // for back_insert_iterator, back_inserter |
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| 21 | #include <list> // for _List_iterator, list, _List_const_... |
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| 22 | #include <map> // for _Rb_tree_iterator, map, _Rb_tree_c... |
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[403b388] | 23 | #include <memory> // for allocator_traits<>::value_type, unique_ptr |
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[ea6332d] | 24 | #include <utility> // for pair |
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[aeb75b1] | 25 | #include <vector> // for vector |
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[51b7345] | 26 | |
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[3bbd012] | 27 | #include "CompilationState.h" // for resolvep |
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[ea6332d] | 28 | #include "Alternative.h" // for AltList, Alternative |
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[51b7345] | 29 | #include "AlternativeFinder.h" |
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[ea6332d] | 30 | #include "Common/SemanticError.h" // for SemanticError |
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| 31 | #include "Common/utility.h" // for deleteAll, printAll, CodeLocation |
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| 32 | #include "Cost.h" // for Cost, Cost::zero, operator<<, Cost... |
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[a8b27c6] | 33 | #include "ExplodedActual.h" // for ExplodedActual |
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[ea6332d] | 34 | #include "InitTweak/InitTweak.h" // for getFunctionName |
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| 35 | #include "RenameVars.h" // for RenameVars, global_renamer |
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[6d6e829] | 36 | #include "ResolveAssertions.h" // for resolveAssertions |
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[ea6332d] | 37 | #include "ResolveTypeof.h" // for resolveTypeof |
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| 38 | #include "Resolver.h" // for resolveStmtExpr |
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| 39 | #include "SymTab/Indexer.h" // for Indexer |
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| 40 | #include "SymTab/Mangler.h" // for Mangler |
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| 41 | #include "SymTab/Validate.h" // for validateType |
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| 42 | #include "SynTree/Constant.h" // for Constant |
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| 43 | #include "SynTree/Declaration.h" // for DeclarationWithType, TypeDecl, Dec... |
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| 44 | #include "SynTree/Expression.h" // for Expression, CastExpr, NameExpr |
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| 45 | #include "SynTree/Initializer.h" // for SingleInit, operator<<, Designation |
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| 46 | #include "SynTree/SynTree.h" // for UniqueId |
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| 47 | #include "SynTree/Type.h" // for Type, FunctionType, PointerType |
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| 48 | #include "Tuples/Explode.h" // for explode |
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| 49 | #include "Tuples/Tuples.h" // for isTtype, handleTupleAssignment |
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| 50 | #include "Unify.h" // for unify |
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| 51 | #include "typeops.h" // for adjustExprType, polyCost, castCost |
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[51b7345] | 52 | |
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[6ed1d4b] | 53 | #define PRINT( text ) if ( resolvep ) { text } |
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[51b7345] | 54 | //#define DEBUG_COST |
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| 55 | |
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[403b388] | 56 | using std::move; |
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| 57 | |
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| 58 | /// copies any copyable type |
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| 59 | template<typename T> |
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| 60 | T copy(const T& x) { return x; } |
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| 61 | |
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[51b7345] | 62 | namespace ResolvExpr { |
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[13deae88] | 63 | struct AlternativeFinder::Finder : public WithShortCircuiting { |
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| 64 | Finder( AlternativeFinder & altFinder ) : altFinder( altFinder ), indexer( altFinder.indexer ), alternatives( altFinder.alternatives ), env( altFinder.env ), targetType( altFinder.targetType ) {} |
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| 65 | |
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| 66 | void previsit( BaseSyntaxNode * ) { visit_children = false; } |
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| 67 | |
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| 68 | void postvisit( ApplicationExpr * applicationExpr ); |
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| 69 | void postvisit( UntypedExpr * untypedExpr ); |
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| 70 | void postvisit( AddressExpr * addressExpr ); |
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| 71 | void postvisit( LabelAddressExpr * labelExpr ); |
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| 72 | void postvisit( CastExpr * castExpr ); |
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| 73 | void postvisit( VirtualCastExpr * castExpr ); |
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| 74 | void postvisit( UntypedMemberExpr * memberExpr ); |
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| 75 | void postvisit( MemberExpr * memberExpr ); |
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| 76 | void postvisit( NameExpr * variableExpr ); |
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| 77 | void postvisit( VariableExpr * variableExpr ); |
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| 78 | void postvisit( ConstantExpr * constantExpr ); |
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| 79 | void postvisit( SizeofExpr * sizeofExpr ); |
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| 80 | void postvisit( AlignofExpr * alignofExpr ); |
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| 81 | void postvisit( UntypedOffsetofExpr * offsetofExpr ); |
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| 82 | void postvisit( OffsetofExpr * offsetofExpr ); |
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| 83 | void postvisit( OffsetPackExpr * offsetPackExpr ); |
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| 84 | void postvisit( AttrExpr * attrExpr ); |
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| 85 | void postvisit( LogicalExpr * logicalExpr ); |
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| 86 | void postvisit( ConditionalExpr * conditionalExpr ); |
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| 87 | void postvisit( CommaExpr * commaExpr ); |
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| 88 | void postvisit( ImplicitCopyCtorExpr * impCpCtorExpr ); |
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| 89 | void postvisit( ConstructorExpr * ctorExpr ); |
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| 90 | void postvisit( RangeExpr * rangeExpr ); |
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| 91 | void postvisit( UntypedTupleExpr * tupleExpr ); |
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| 92 | void postvisit( TupleExpr * tupleExpr ); |
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| 93 | void postvisit( TupleIndexExpr * tupleExpr ); |
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| 94 | void postvisit( TupleAssignExpr * tupleExpr ); |
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| 95 | void postvisit( UniqueExpr * unqExpr ); |
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| 96 | void postvisit( StmtExpr * stmtExpr ); |
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| 97 | void postvisit( UntypedInitExpr * initExpr ); |
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[c71b256] | 98 | void postvisit( InitExpr * initExpr ); |
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| 99 | void postvisit( DeletedExpr * delExpr ); |
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[d807ca28] | 100 | void postvisit( GenericExpr * genExpr ); |
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[13deae88] | 101 | |
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| 102 | /// Adds alternatives for anonymous members |
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| 103 | void addAnonConversions( const Alternative & alt ); |
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| 104 | /// Adds alternatives for member expressions, given the aggregate, conversion cost for that aggregate, and name of the member |
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[6d6e829] | 105 | template< typename StructOrUnionType > void addAggMembers( StructOrUnionType *aggInst, Expression *expr, const Alternative &alt, const Cost &newCost, const std::string & name ); |
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[13deae88] | 106 | /// Adds alternatives for member expressions where the left side has tuple type |
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[6d6e829] | 107 | void addTupleMembers( TupleType *tupleType, Expression *expr, const Alternative &alt, const Cost &newCost, Expression *member ); |
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[13deae88] | 108 | /// Adds alternatives for offsetof expressions, given the base type and name of the member |
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| 109 | template< typename StructOrUnionType > void addOffsetof( StructOrUnionType *aggInst, const std::string &name ); |
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| 110 | /// Takes a final result and checks if its assertions can be satisfied |
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| 111 | template<typename OutputIterator> |
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| 112 | void validateFunctionAlternative( const Alternative &func, ArgPack& result, const std::vector<ArgPack>& results, OutputIterator out ); |
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| 113 | /// Finds matching alternatives for a function, given a set of arguments |
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| 114 | template<typename OutputIterator> |
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| 115 | void makeFunctionAlternatives( const Alternative &func, FunctionType *funcType, const ExplodedArgs& args, OutputIterator out ); |
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[0b00df0] | 116 | /// Sets up parameter inference for an output alternative |
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[13deae88] | 117 | template< typename OutputIterator > |
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[0b00df0] | 118 | void inferParameters( Alternative &newAlt, OutputIterator out ); |
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[13deae88] | 119 | private: |
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| 120 | AlternativeFinder & altFinder; |
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| 121 | const SymTab::Indexer &indexer; |
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| 122 | AltList & alternatives; |
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| 123 | const TypeEnvironment &env; |
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| 124 | Type *& targetType; |
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| 125 | }; |
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| 126 | |
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[908cc83] | 127 | Cost sumCost( const AltList &in ) { |
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[89be1c68] | 128 | Cost total = Cost::zero; |
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[908cc83] | 129 | for ( AltList::const_iterator i = in.begin(); i != in.end(); ++i ) { |
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| 130 | total += i->cost; |
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| 131 | } |
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| 132 | return total; |
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| 133 | } |
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| 134 | |
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[1e8bbac9] | 135 | void printAlts( const AltList &list, std::ostream &os, unsigned int indentAmt ) { |
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| 136 | Indenter indent = { Indenter::tabsize, indentAmt }; |
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| 137 | for ( AltList::const_iterator i = list.begin(); i != list.end(); ++i ) { |
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| 138 | i->print( os, indent ); |
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| 139 | os << std::endl; |
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[a32b204] | 140 | } |
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[1e8bbac9] | 141 | } |
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[d9a0e76] | 142 | |
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[1e8bbac9] | 143 | namespace { |
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[a32b204] | 144 | void makeExprList( const AltList &in, std::list< Expression* > &out ) { |
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| 145 | for ( AltList::const_iterator i = in.begin(); i != in.end(); ++i ) { |
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| 146 | out.push_back( i->expr->clone() ); |
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| 147 | } |
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| 148 | } |
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[d9a0e76] | 149 | |
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[a32b204] | 150 | struct PruneStruct { |
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| 151 | bool isAmbiguous; |
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| 152 | AltList::iterator candidate; |
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| 153 | PruneStruct() {} |
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| 154 | PruneStruct( AltList::iterator candidate ): isAmbiguous( false ), candidate( candidate ) {} |
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| 155 | }; |
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| 156 | |
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[0f19d763] | 157 | /// 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] | 158 | template< typename InputIterator, typename OutputIterator > |
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[d7dc824] | 159 | void pruneAlternatives( InputIterator begin, InputIterator end, OutputIterator out ) { |
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[a32b204] | 160 | // select the alternatives that have the minimum conversion cost for a particular set of result types |
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| 161 | std::map< std::string, PruneStruct > selected; |
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| 162 | for ( AltList::iterator candidate = begin; candidate != end; ++candidate ) { |
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| 163 | PruneStruct current( candidate ); |
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| 164 | std::string mangleName; |
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[906e24d] | 165 | { |
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| 166 | Type * newType = candidate->expr->get_result()->clone(); |
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[a32b204] | 167 | candidate->env.apply( newType ); |
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[906e24d] | 168 | mangleName = SymTab::Mangler::mangle( newType ); |
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[a32b204] | 169 | delete newType; |
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| 170 | } |
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| 171 | std::map< std::string, PruneStruct >::iterator mapPlace = selected.find( mangleName ); |
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| 172 | if ( mapPlace != selected.end() ) { |
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| 173 | if ( candidate->cost < mapPlace->second.candidate->cost ) { |
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| 174 | PRINT( |
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[6ed1d4b] | 175 | std::cerr << "cost " << candidate->cost << " beats " << mapPlace->second.candidate->cost << std::endl; |
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[7c64920] | 176 | ) |
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[0f19d763] | 177 | selected[ mangleName ] = current; |
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[a32b204] | 178 | } else if ( candidate->cost == mapPlace->second.candidate->cost ) { |
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[630bcb5] | 179 | // if one of the candidates contains a deleted identifier, can pick the other, since |
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| 180 | // deleted expressions should not be ambiguous if there is another option that is at least as good |
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| 181 | if ( findDeletedExpr( candidate->expr ) ) { |
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| 182 | // do nothing |
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| 183 | PRINT( std::cerr << "candidate is deleted" << std::endl; ) |
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| 184 | } else if ( findDeletedExpr( mapPlace->second.candidate->expr ) ) { |
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| 185 | PRINT( std::cerr << "current is deleted" << std::endl; ) |
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| 186 | selected[ mangleName ] = current; |
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| 187 | } else { |
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| 188 | PRINT( |
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| 189 | std::cerr << "marking ambiguous" << std::endl; |
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| 190 | ) |
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| 191 | mapPlace->second.isAmbiguous = true; |
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| 192 | } |
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[b0837e4] | 193 | } else { |
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| 194 | PRINT( |
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| 195 | std::cerr << "cost " << candidate->cost << " loses to " << mapPlace->second.candidate->cost << std::endl; |
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| 196 | ) |
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[a32b204] | 197 | } |
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| 198 | } else { |
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| 199 | selected[ mangleName ] = current; |
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| 200 | } |
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| 201 | } |
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[d9a0e76] | 202 | |
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[0f19d763] | 203 | // accept the alternatives that were unambiguous |
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| 204 | for ( std::map< std::string, PruneStruct >::iterator target = selected.begin(); target != selected.end(); ++target ) { |
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| 205 | if ( ! target->second.isAmbiguous ) { |
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| 206 | Alternative &alt = *target->second.candidate; |
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[906e24d] | 207 | alt.env.applyFree( alt.expr->get_result() ); |
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[0f19d763] | 208 | *out++ = alt; |
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[a32b204] | 209 | } |
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[0f19d763] | 210 | } |
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[d9a0e76] | 211 | } |
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[a32b204] | 212 | |
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| 213 | void renameTypes( Expression *expr ) { |
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[ad51cc2] | 214 | renameTyVars( expr->result ); |
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[e76acbe] | 215 | } |
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[1dcd9554] | 216 | } // namespace |
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[b1bead1] | 217 | |
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[a181494] | 218 | void referenceToRvalueConversion( Expression *& expr, Cost & cost ) { |
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[1dcd9554] | 219 | if ( dynamic_cast< ReferenceType * >( expr->get_result() ) ) { |
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| 220 | // cast away reference from expr |
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| 221 | expr = new CastExpr( expr, expr->get_result()->stripReferences()->clone() ); |
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[a181494] | 222 | cost.incReference(); |
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[b1bead1] | 223 | } |
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[1dcd9554] | 224 | } |
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[d9a0e76] | 225 | |
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[a32b204] | 226 | template< typename InputIterator, typename OutputIterator > |
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| 227 | void AlternativeFinder::findSubExprs( InputIterator begin, InputIterator end, OutputIterator out ) { |
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| 228 | while ( begin != end ) { |
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| 229 | AlternativeFinder finder( indexer, env ); |
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| 230 | finder.findWithAdjustment( *begin ); |
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| 231 | // XXX either this |
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| 232 | //Designators::fixDesignations( finder, (*begin++)->get_argName() ); |
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| 233 | // or XXX this |
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| 234 | begin++; |
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| 235 | PRINT( |
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[6ed1d4b] | 236 | std::cerr << "findSubExprs" << std::endl; |
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| 237 | printAlts( finder.alternatives, std::cerr ); |
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[7c64920] | 238 | ) |
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[0f19d763] | 239 | *out++ = finder; |
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[a32b204] | 240 | } |
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[d9a0e76] | 241 | } |
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| 242 | |
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[a32b204] | 243 | AlternativeFinder::AlternativeFinder( const SymTab::Indexer &indexer, const TypeEnvironment &env ) |
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| 244 | : indexer( indexer ), env( env ) { |
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[d9a0e76] | 245 | } |
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[51b7345] | 246 | |
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[59cf83b] | 247 | void AlternativeFinder::find( Expression *expr, ResolvMode mode ) { |
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[13deae88] | 248 | PassVisitor<Finder> finder( *this ); |
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| 249 | expr->accept( finder ); |
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[59cf83b] | 250 | if ( mode.failFast && alternatives.empty() ) { |
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[83882e9] | 251 | PRINT( |
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| 252 | std::cerr << "No reasonable alternatives for expression " << expr << std::endl; |
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| 253 | ) |
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[a16764a6] | 254 | SemanticError( expr, "No reasonable alternatives for expression " ); |
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[a32b204] | 255 | } |
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[fbecee5] | 256 | if ( mode.resolveAssns || mode.prune ) { |
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[6d6e829] | 257 | // trim candidates just to those where the assertions resolve |
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[fbecee5] | 258 | // - necessary pre-requisite to pruning |
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[6d6e829] | 259 | AltList candidates; |
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| 260 | for ( unsigned i = 0; i < alternatives.size(); ++i ) { |
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| 261 | resolveAssertions( alternatives[i], indexer, candidates ); |
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| 262 | } |
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| 263 | // fail early if none such |
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| 264 | if ( mode.failFast && candidates.empty() ) { |
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| 265 | std::ostringstream stream; |
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| 266 | stream << "No resolvable alternatives for expression " << expr << "\n" |
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| 267 | << "Alternatives with failing assertions are:\n"; |
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| 268 | printAlts( alternatives, stream, 1 ); |
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| 269 | SemanticError( expr->location, stream.str() ); |
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| 270 | } |
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| 271 | // reset alternatives |
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| 272 | alternatives = std::move( candidates ); |
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| 273 | } |
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[59cf83b] | 274 | if ( mode.prune ) { |
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[b0837e4] | 275 | auto oldsize = alternatives.size(); |
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[b6fe7e6] | 276 | PRINT( |
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| 277 | std::cerr << "alternatives before prune:" << std::endl; |
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| 278 | printAlts( alternatives, std::cerr ); |
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| 279 | ) |
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[bd4f2e9] | 280 | AltList pruned; |
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| 281 | pruneAlternatives( alternatives.begin(), alternatives.end(), back_inserter( pruned ) ); |
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[59cf83b] | 282 | if ( mode.failFast && pruned.empty() ) { |
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[b6fe7e6] | 283 | std::ostringstream stream; |
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| 284 | AltList winners; |
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| 285 | findMinCost( alternatives.begin(), alternatives.end(), back_inserter( winners ) ); |
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[50377a4] | 286 | stream << "Cannot choose between " << winners.size() << " alternatives for expression\n"; |
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[5a824c2] | 287 | expr->print( stream ); |
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[93401f8] | 288 | stream << " Alternatives are:\n"; |
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[50377a4] | 289 | printAlts( winners, stream, 1 ); |
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[a16764a6] | 290 | SemanticError( expr->location, stream.str() ); |
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[b6fe7e6] | 291 | } |
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[bd4f2e9] | 292 | alternatives = move(pruned); |
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[b0837e4] | 293 | PRINT( |
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| 294 | std::cerr << "there are " << oldsize << " alternatives before elimination" << std::endl; |
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| 295 | ) |
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[b6fe7e6] | 296 | PRINT( |
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| 297 | std::cerr << "there are " << alternatives.size() << " alternatives after elimination" << std::endl; |
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| 298 | ) |
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[a32b204] | 299 | } |
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[954ef5b] | 300 | // adjust types after pruning so that types substituted by pruneAlternatives are correctly adjusted |
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[59cf83b] | 301 | if ( mode.adjust ) { |
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| 302 | for ( Alternative& i : alternatives ) { |
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| 303 | adjustExprType( i.expr->get_result(), i.env, indexer ); |
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[954ef5b] | 304 | } |
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| 305 | } |
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[8e9cbb2] | 306 | |
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[64ac636] | 307 | // Central location to handle gcc extension keyword, etc. for all expression types. |
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[8e9cbb2] | 308 | for ( Alternative &iter: alternatives ) { |
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| 309 | iter.expr->set_extension( expr->get_extension() ); |
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[64ac636] | 310 | iter.expr->location = expr->location; |
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[8e9cbb2] | 311 | } // for |
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[0f19d763] | 312 | } |
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[d9a0e76] | 313 | |
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[4e66a18] | 314 | void AlternativeFinder::findWithAdjustment( Expression *expr ) { |
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[59cf83b] | 315 | find( expr, ResolvMode::withAdjustment() ); |
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[4e66a18] | 316 | } |
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| 317 | |
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| 318 | void AlternativeFinder::findWithoutPrune( Expression * expr ) { |
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[59cf83b] | 319 | find( expr, ResolvMode::withoutPrune() ); |
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[4e66a18] | 320 | } |
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| 321 | |
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| 322 | void AlternativeFinder::maybeFind( Expression * expr ) { |
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[59cf83b] | 323 | find( expr, ResolvMode::withoutFailFast() ); |
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[d9a0e76] | 324 | } |
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[a32b204] | 325 | |
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[13deae88] | 326 | void AlternativeFinder::Finder::addAnonConversions( const Alternative & alt ) { |
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[4b0f997] | 327 | // adds anonymous member interpretations whenever an aggregate value type is seen. |
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[d1685588] | 328 | // it's okay for the aggregate expression to have reference type -- cast it to the base type to treat the aggregate as the referenced value |
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| 329 | std::unique_ptr<Expression> aggrExpr( alt.expr->clone() ); |
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[25fcb84] | 330 | alt.env.apply( aggrExpr->result ); |
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| 331 | Type * aggrType = aggrExpr->result; |
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[d1685588] | 332 | if ( dynamic_cast< ReferenceType * >( aggrType ) ) { |
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| 333 | aggrType = aggrType->stripReferences(); |
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| 334 | aggrExpr.reset( new CastExpr( aggrExpr.release(), aggrType->clone() ) ); |
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| 335 | } |
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| 336 | |
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[25fcb84] | 337 | if ( StructInstType *structInst = dynamic_cast< StructInstType* >( aggrExpr->result ) ) { |
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[6d6e829] | 338 | addAggMembers( structInst, aggrExpr.get(), alt, alt.cost+Cost::safe, "" ); |
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[25fcb84] | 339 | } else if ( UnionInstType *unionInst = dynamic_cast< UnionInstType* >( aggrExpr->result ) ) { |
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[6d6e829] | 340 | addAggMembers( unionInst, aggrExpr.get(), alt, alt.cost+Cost::safe, "" ); |
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[4b0f997] | 341 | } // if |
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| 342 | } |
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[77971f6] | 343 | |
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[a32b204] | 344 | template< typename StructOrUnionType > |
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[6d6e829] | 345 | void AlternativeFinder::Finder::addAggMembers( StructOrUnionType *aggInst, Expression *expr, const Alternative& alt, const Cost &newCost, const std::string & name ) { |
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[bf32bb8] | 346 | std::list< Declaration* > members; |
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| 347 | aggInst->lookup( name, members ); |
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[4b0f997] | 348 | |
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[5de1e2c] | 349 | for ( Declaration * decl : members ) { |
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| 350 | if ( DeclarationWithType *dwt = dynamic_cast< DeclarationWithType* >( decl ) ) { |
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| 351 | // addAnonAlternatives uses vector::push_back, which invalidates references to existing elements, so |
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| 352 | // can't construct in place and use vector::back |
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[6d6e829] | 353 | Alternative newAlt{ alt, new MemberExpr{ dwt, expr->clone() }, newCost }; |
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[5de1e2c] | 354 | renameTypes( newAlt.expr ); |
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| 355 | addAnonConversions( newAlt ); // add anonymous member interpretations whenever an aggregate value type is seen as a member expression. |
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| 356 | alternatives.push_back( std::move(newAlt) ); |
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[bf32bb8] | 357 | } else { |
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| 358 | assert( false ); |
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[a32b204] | 359 | } |
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| 360 | } |
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[d9a0e76] | 361 | } |
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[a32b204] | 362 | |
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[6d6e829] | 363 | void AlternativeFinder::Finder::addTupleMembers( TupleType *tupleType, Expression *expr, const Alternative &alt, const Cost &newCost, Expression *member ) { |
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[848ce71] | 364 | if ( ConstantExpr * constantExpr = dynamic_cast< ConstantExpr * >( member ) ) { |
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| 365 | // get the value of the constant expression as an int, must be between 0 and the length of the tuple type to have meaning |
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[2a6c115] | 366 | auto val = constantExpr->intValue(); |
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[848ce71] | 367 | std::string tmp; |
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[2a6c115] | 368 | if ( val >= 0 && (unsigned long long)val < tupleType->size() ) { |
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[6d6e829] | 369 | alternatives.push_back( Alternative{ |
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| 370 | alt, new TupleIndexExpr( expr->clone(), val ), newCost } ); |
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[2a6c115] | 371 | } // if |
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[848ce71] | 372 | } // if |
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| 373 | } |
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| 374 | |
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[13deae88] | 375 | void AlternativeFinder::Finder::postvisit( ApplicationExpr *applicationExpr ) { |
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[6d6e829] | 376 | alternatives.push_back( Alternative{ applicationExpr->clone(), env } ); |
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[d9a0e76] | 377 | } |
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| 378 | |
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[ddf8a29] | 379 | Cost computeConversionCost( Type * actualType, Type * formalType, const SymTab::Indexer &indexer, const TypeEnvironment & env ) { |
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| 380 | PRINT( |
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| 381 | std::cerr << std::endl << "converting "; |
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| 382 | actualType->print( std::cerr, 8 ); |
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| 383 | std::cerr << std::endl << " to "; |
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| 384 | formalType->print( std::cerr, 8 ); |
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| 385 | std::cerr << std::endl << "environment is: "; |
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| 386 | env.print( std::cerr, 8 ); |
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| 387 | std::cerr << std::endl; |
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| 388 | ) |
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| 389 | Cost convCost = conversionCost( actualType, formalType, indexer, env ); |
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| 390 | PRINT( |
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[d06c808] | 391 | std::cerr << std::endl << "cost is " << convCost << std::endl; |
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[ddf8a29] | 392 | ) |
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| 393 | if ( convCost == Cost::infinity ) { |
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| 394 | return convCost; |
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| 395 | } |
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| 396 | convCost.incPoly( polyCost( formalType, env, indexer ) + polyCost( actualType, env, indexer ) ); |
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[d06c808] | 397 | PRINT( |
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| 398 | std::cerr << "cost with polycost is " << convCost << std::endl; |
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| 399 | ) |
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[ddf8a29] | 400 | return convCost; |
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| 401 | } |
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| 402 | |
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| 403 | Cost computeExpressionConversionCost( Expression *& actualExpr, Type * formalType, const SymTab::Indexer &indexer, const TypeEnvironment & env ) { |
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| 404 | Cost convCost = computeConversionCost( actualExpr->result, formalType, indexer, env ); |
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| 405 | |
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[bb666f64] | 406 | // if there is a non-zero conversion cost, ignoring poly cost, then the expression requires conversion. |
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| 407 | // ignore poly cost for now, since this requires resolution of the cast to infer parameters and this |
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| 408 | // does not currently work for the reason stated below. |
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[ddf8a29] | 409 | Cost tmpCost = convCost; |
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| 410 | tmpCost.incPoly( -tmpCost.get_polyCost() ); |
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| 411 | if ( tmpCost != Cost::zero ) { |
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| 412 | Type *newType = formalType->clone(); |
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| 413 | env.apply( newType ); |
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| 414 | actualExpr = new CastExpr( actualExpr, newType ); |
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| 415 | // xxx - SHOULD be able to resolve this cast, but at the moment pointers are not castable to zero_t, but are implicitly convertible. This is clearly |
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| 416 | // inconsistent, once this is fixed it should be possible to resolve the cast. |
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| 417 | // xxx - this isn't working, it appears because type1 (the formal type) is seen as widenable, but it shouldn't be, because this makes the conversion from DT* to DT* since commontype(zero_t, DT*) is DT*, rather than just nothing. |
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| 418 | |
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| 419 | // AlternativeFinder finder( indexer, env ); |
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| 420 | // finder.findWithAdjustment( actualExpr ); |
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| 421 | // assertf( finder.get_alternatives().size() > 0, "Somehow castable expression failed to find alternatives." ); |
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| 422 | // assertf( finder.get_alternatives().size() == 1, "Somehow got multiple alternatives for known cast expression." ); |
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| 423 | // Alternative & alt = finder.get_alternatives().front(); |
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| 424 | // delete actualExpr; |
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| 425 | // actualExpr = alt.expr->clone(); |
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| 426 | } |
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| 427 | return convCost; |
---|
| 428 | } |
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| 429 | |
---|
| 430 | Cost computeApplicationConversionCost( Alternative &alt, const SymTab::Indexer &indexer ) { |
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[e3e16bc] | 431 | ApplicationExpr *appExpr = strict_dynamic_cast< ApplicationExpr* >( alt.expr ); |
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[1dd1bd2] | 432 | PointerType *pointer = strict_dynamic_cast< PointerType* >( appExpr->function->result ); |
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| 433 | FunctionType *function = strict_dynamic_cast< FunctionType* >( pointer->base ); |
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[a32b204] | 434 | |
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[89be1c68] | 435 | Cost convCost = Cost::zero; |
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[1dd1bd2] | 436 | std::list< DeclarationWithType* >& formals = function->parameters; |
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[a32b204] | 437 | std::list< DeclarationWithType* >::iterator formal = formals.begin(); |
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[1dd1bd2] | 438 | std::list< Expression* >& actuals = appExpr->args; |
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[0362d42] | 439 | |
---|
[1dd1bd2] | 440 | for ( Expression*& actualExpr : actuals ) { |
---|
| 441 | Type * actualType = actualExpr->result; |
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[a32b204] | 442 | PRINT( |
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[6ed1d4b] | 443 | std::cerr << "actual expression:" << std::endl; |
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[1dd1bd2] | 444 | actualExpr->print( std::cerr, 8 ); |
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[6ed1d4b] | 445 | std::cerr << "--- results are" << std::endl; |
---|
[53e3b4a] | 446 | actualType->print( std::cerr, 8 ); |
---|
[7c64920] | 447 | ) |
---|
[53e3b4a] | 448 | if ( formal == formals.end() ) { |
---|
[1dd1bd2] | 449 | if ( function->isVarArgs ) { |
---|
[89be1c68] | 450 | convCost.incUnsafe(); |
---|
[d06c808] | 451 | PRINT( std::cerr << "end of formals with varargs function: inc unsafe: " << convCost << std::endl; ; ) |
---|
[b1bead1] | 452 | // convert reference-typed expressions to value-typed expressions |
---|
[1dd1bd2] | 453 | referenceToRvalueConversion( actualExpr, convCost ); |
---|
[53e3b4a] | 454 | continue; |
---|
| 455 | } else { |
---|
| 456 | return Cost::infinity; |
---|
[7c64920] | 457 | } |
---|
[53e3b4a] | 458 | } |
---|
[1dd1bd2] | 459 | if ( DefaultArgExpr * def = dynamic_cast< DefaultArgExpr * >( actualExpr ) ) { |
---|
[0f79853] | 460 | // default arguments should be free - don't include conversion cost. |
---|
| 461 | // Unwrap them here because they are not relevant to the rest of the system. |
---|
[1dd1bd2] | 462 | actualExpr = def->expr; |
---|
[0f79853] | 463 | ++formal; |
---|
| 464 | continue; |
---|
| 465 | } |
---|
[1dd1bd2] | 466 | // mark conversion cost to formal and also specialization cost of formal type |
---|
[53e3b4a] | 467 | Type * formalType = (*formal)->get_type(); |
---|
[1dd1bd2] | 468 | convCost += computeExpressionConversionCost( actualExpr, formalType, indexer, alt.env ); |
---|
| 469 | convCost.decSpec( specCost( formalType ) ); |
---|
[53e3b4a] | 470 | ++formal; // can't be in for-loop update because of the continue |
---|
[d9a0e76] | 471 | } |
---|
[a32b204] | 472 | if ( formal != formals.end() ) { |
---|
| 473 | return Cost::infinity; |
---|
[d9a0e76] | 474 | } |
---|
| 475 | |
---|
[bd78797] | 476 | // specialization cost of return types can't be accounted for directly, it disables |
---|
| 477 | // otherwise-identical calls, like this example based on auto-newline in the I/O lib: |
---|
| 478 | // |
---|
| 479 | // forall(otype OS) { |
---|
| 480 | // void ?|?(OS&, int); // with newline |
---|
| 481 | // OS& ?|?(OS&, int); // no newline, always chosen due to more specialization |
---|
| 482 | // } |
---|
[1dd1bd2] | 483 | |
---|
| 484 | // mark type variable and specialization cost of forall clause |
---|
| 485 | convCost.incVar( function->forall.size() ); |
---|
| 486 | for ( TypeDecl* td : function->forall ) { |
---|
| 487 | convCost.decSpec( td->assertions.size() ); |
---|
| 488 | } |
---|
| 489 | |
---|
[a32b204] | 490 | return convCost; |
---|
| 491 | } |
---|
[d9a0e76] | 492 | |
---|
[8c84ebd] | 493 | /// Adds type variables to the open variable set and marks their assertions |
---|
[a32b204] | 494 | void makeUnifiableVars( Type *type, OpenVarSet &unifiableVars, AssertionSet &needAssertions ) { |
---|
[43bd69d] | 495 | for ( Type::ForallList::const_iterator tyvar = type->forall.begin(); tyvar != type->forall.end(); ++tyvar ) { |
---|
[2c57025] | 496 | unifiableVars[ (*tyvar)->get_name() ] = TypeDecl::Data{ *tyvar }; |
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[43bd69d] | 497 | for ( std::list< DeclarationWithType* >::iterator assert = (*tyvar)->assertions.begin(); assert != (*tyvar)->assertions.end(); ++assert ) { |
---|
[6c3a988f] | 498 | needAssertions[ *assert ].isUsed = true; |
---|
[a32b204] | 499 | } |
---|
[d9a0e76] | 500 | } |
---|
| 501 | } |
---|
[a32b204] | 502 | |
---|
[0b00df0] | 503 | /// Unique identifier for matching expression resolutions to their requesting expression |
---|
| 504 | UniqueId globalResnSlot = 0; |
---|
| 505 | |
---|
[a32b204] | 506 | template< typename OutputIterator > |
---|
[0b00df0] | 507 | void AlternativeFinder::Finder::inferParameters( Alternative &newAlt, OutputIterator out ) { |
---|
| 508 | // Set need bindings for any unbound assertions |
---|
| 509 | UniqueId crntResnSlot = 0; // matching ID for this expression's assertions |
---|
| 510 | for ( auto& assn : newAlt.need ) { |
---|
| 511 | // skip already-matched assertions |
---|
| 512 | if ( assn.info.resnSlot != 0 ) continue; |
---|
| 513 | // assign slot for expression if needed |
---|
| 514 | if ( crntResnSlot == 0 ) { crntResnSlot = ++globalResnSlot; } |
---|
| 515 | // fix slot to assertion |
---|
| 516 | assn.info.resnSlot = crntResnSlot; |
---|
| 517 | } |
---|
| 518 | // pair slot to expression |
---|
| 519 | if ( crntResnSlot != 0 ) { newAlt.expr->resnSlots.push_back( crntResnSlot ); } |
---|
| 520 | |
---|
| 521 | // add to output list, assertion resolution is deferred |
---|
[6d6e829] | 522 | *out++ = newAlt; |
---|
[d9a0e76] | 523 | } |
---|
| 524 | |
---|
[aeb75b1] | 525 | /// Gets a default value from an initializer, nullptr if not present |
---|
| 526 | ConstantExpr* getDefaultValue( Initializer* init ) { |
---|
| 527 | if ( SingleInit* si = dynamic_cast<SingleInit*>( init ) ) { |
---|
[630bcb5] | 528 | if ( CastExpr* ce = dynamic_cast<CastExpr*>( si->value ) ) { |
---|
| 529 | return dynamic_cast<ConstantExpr*>( ce->arg ); |
---|
| 530 | } else { |
---|
| 531 | return dynamic_cast<ConstantExpr*>( si->value ); |
---|
[aeb75b1] | 532 | } |
---|
| 533 | } |
---|
| 534 | return nullptr; |
---|
| 535 | } |
---|
| 536 | |
---|
| 537 | /// State to iteratively build a match of parameter expressions to arguments |
---|
| 538 | struct ArgPack { |
---|
[452747a] | 539 | std::size_t parent; ///< Index of parent pack |
---|
[403b388] | 540 | std::unique_ptr<Expression> expr; ///< The argument stored here |
---|
| 541 | Cost cost; ///< The cost of this argument |
---|
| 542 | TypeEnvironment env; ///< Environment for this pack |
---|
| 543 | AssertionSet need; ///< Assertions outstanding for this pack |
---|
| 544 | AssertionSet have; ///< Assertions found for this pack |
---|
| 545 | OpenVarSet openVars; ///< Open variables for this pack |
---|
| 546 | unsigned nextArg; ///< Index of next argument in arguments list |
---|
| 547 | unsigned tupleStart; ///< Number of tuples that start at this index |
---|
[a8b27c6] | 548 | unsigned nextExpl; ///< Index of next exploded element |
---|
| 549 | unsigned explAlt; ///< Index of alternative for nextExpl > 0 |
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[403b388] | 550 | |
---|
| 551 | ArgPack() |
---|
[ad51cc2] | 552 | : parent(0), expr(), cost(Cost::zero), env(), need(), have(), openVars(), nextArg(0), |
---|
[a8b27c6] | 553 | tupleStart(0), nextExpl(0), explAlt(0) {} |
---|
[aeb75b1] | 554 | |
---|
[11094d9] | 555 | ArgPack(const TypeEnvironment& env, const AssertionSet& need, const AssertionSet& have, |
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[aeb75b1] | 556 | const OpenVarSet& openVars) |
---|
[452747a] | 557 | : parent(0), expr(), cost(Cost::zero), env(env), need(need), have(have), |
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[a8b27c6] | 558 | openVars(openVars), nextArg(0), tupleStart(0), nextExpl(0), explAlt(0) {} |
---|
[11094d9] | 559 | |
---|
[452747a] | 560 | ArgPack(std::size_t parent, Expression* expr, TypeEnvironment&& env, AssertionSet&& need, |
---|
| 561 | AssertionSet&& have, OpenVarSet&& openVars, unsigned nextArg, |
---|
[178e4ec] | 562 | unsigned tupleStart = 0, Cost cost = Cost::zero, unsigned nextExpl = 0, |
---|
[a8b27c6] | 563 | unsigned explAlt = 0 ) |
---|
[452747a] | 564 | : parent(parent), expr(expr->clone()), cost(cost), env(move(env)), need(move(need)), |
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[403b388] | 565 | have(move(have)), openVars(move(openVars)), nextArg(nextArg), tupleStart(tupleStart), |
---|
[a8b27c6] | 566 | nextExpl(nextExpl), explAlt(explAlt) {} |
---|
[452747a] | 567 | |
---|
| 568 | ArgPack(const ArgPack& o, TypeEnvironment&& env, AssertionSet&& need, AssertionSet&& have, |
---|
[73a5cadb] | 569 | OpenVarSet&& openVars, unsigned nextArg, Cost added ) |
---|
[452747a] | 570 | : parent(o.parent), expr(o.expr ? o.expr->clone() : nullptr), cost(o.cost + added), |
---|
| 571 | env(move(env)), need(move(need)), have(move(have)), openVars(move(openVars)), |
---|
[a8b27c6] | 572 | nextArg(nextArg), tupleStart(o.tupleStart), nextExpl(0), explAlt(0) {} |
---|
[73a5cadb] | 573 | |
---|
[a8b27c6] | 574 | /// true iff this pack is in the middle of an exploded argument |
---|
| 575 | bool hasExpl() const { return nextExpl > 0; } |
---|
[aeb75b1] | 576 | |
---|
[a8b27c6] | 577 | /// Gets the list of exploded alternatives for this pack |
---|
| 578 | const ExplodedActual& getExpl( const ExplodedArgs& args ) const { |
---|
| 579 | return args[nextArg-1][explAlt]; |
---|
| 580 | } |
---|
[aeb75b1] | 581 | |
---|
| 582 | /// Ends a tuple expression, consolidating the appropriate actuals |
---|
[403b388] | 583 | void endTuple( const std::vector<ArgPack>& packs ) { |
---|
| 584 | // add all expressions in tuple to list, summing cost |
---|
[aeb75b1] | 585 | std::list<Expression*> exprs; |
---|
[403b388] | 586 | const ArgPack* pack = this; |
---|
| 587 | if ( expr ) { exprs.push_front( expr.release() ); } |
---|
| 588 | while ( pack->tupleStart == 0 ) { |
---|
| 589 | pack = &packs[pack->parent]; |
---|
| 590 | exprs.push_front( pack->expr->clone() ); |
---|
| 591 | cost += pack->cost; |
---|
[aeb75b1] | 592 | } |
---|
[403b388] | 593 | // reset pack to appropriate tuple |
---|
| 594 | expr.reset( new TupleExpr( exprs ) ); |
---|
| 595 | tupleStart = pack->tupleStart - 1; |
---|
| 596 | parent = pack->parent; |
---|
[aeb75b1] | 597 | } |
---|
[4b6ef70] | 598 | }; |
---|
[aeb75b1] | 599 | |
---|
| 600 | /// Instantiates an argument to match a formal, returns false if no results left |
---|
[11094d9] | 601 | bool instantiateArgument( Type* formalType, Initializer* initializer, |
---|
[178e4ec] | 602 | const ExplodedArgs& args, std::vector<ArgPack>& results, std::size_t& genStart, |
---|
[a8b27c6] | 603 | const SymTab::Indexer& indexer, unsigned nTuples = 0 ) { |
---|
[3d2ae8d] | 604 | if ( TupleType * tupleType = dynamic_cast<TupleType*>( formalType ) ) { |
---|
[aeb75b1] | 605 | // formalType is a TupleType - group actuals into a TupleExpr |
---|
[403b388] | 606 | ++nTuples; |
---|
[aeb75b1] | 607 | for ( Type* type : *tupleType ) { |
---|
| 608 | // xxx - dropping initializer changes behaviour from previous, but seems correct |
---|
[3d2ae8d] | 609 | // ^^^ need to handle the case where a tuple has a default argument |
---|
[452747a] | 610 | if ( ! instantiateArgument( |
---|
| 611 | type, nullptr, args, results, genStart, indexer, nTuples ) ) |
---|
[aeb75b1] | 612 | return false; |
---|
[403b388] | 613 | nTuples = 0; |
---|
| 614 | } |
---|
| 615 | // re-consititute tuples for final generation |
---|
| 616 | for ( auto i = genStart; i < results.size(); ++i ) { |
---|
| 617 | results[i].endTuple( results ); |
---|
[aeb75b1] | 618 | } |
---|
| 619 | return true; |
---|
[3d2ae8d] | 620 | } else if ( TypeInstType * ttype = Tuples::isTtype( formalType ) ) { |
---|
[aeb75b1] | 621 | // formalType is a ttype, consumes all remaining arguments |
---|
| 622 | // xxx - mixing default arguments with variadic?? |
---|
[403b388] | 623 | |
---|
| 624 | // completed tuples; will be spliced to end of results to finish |
---|
| 625 | std::vector<ArgPack> finalResults{}; |
---|
| 626 | |
---|
[aeb75b1] | 627 | // iterate until all results completed |
---|
[403b388] | 628 | std::size_t genEnd; |
---|
| 629 | ++nTuples; |
---|
| 630 | do { |
---|
| 631 | genEnd = results.size(); |
---|
| 632 | |
---|
[aeb75b1] | 633 | // add another argument to results |
---|
[403b388] | 634 | for ( std::size_t i = genStart; i < genEnd; ++i ) { |
---|
[a8b27c6] | 635 | auto nextArg = results[i].nextArg; |
---|
[452747a] | 636 | |
---|
[62194cb] | 637 | // use next element of exploded tuple if present |
---|
[a8b27c6] | 638 | if ( results[i].hasExpl() ) { |
---|
| 639 | const ExplodedActual& expl = results[i].getExpl( args ); |
---|
[403b388] | 640 | |
---|
[a8b27c6] | 641 | unsigned nextExpl = results[i].nextExpl + 1; |
---|
[62194cb] | 642 | if ( nextExpl == expl.exprs.size() ) { |
---|
[a8b27c6] | 643 | nextExpl = 0; |
---|
| 644 | } |
---|
[403b388] | 645 | |
---|
| 646 | results.emplace_back( |
---|
[178e4ec] | 647 | i, expl.exprs[results[i].nextExpl].get(), copy(results[i].env), |
---|
| 648 | copy(results[i].need), copy(results[i].have), |
---|
| 649 | copy(results[i].openVars), nextArg, nTuples, Cost::zero, nextExpl, |
---|
[62194cb] | 650 | results[i].explAlt ); |
---|
[452747a] | 651 | |
---|
[403b388] | 652 | continue; |
---|
| 653 | } |
---|
[452747a] | 654 | |
---|
[aeb75b1] | 655 | // finish result when out of arguments |
---|
[a8b27c6] | 656 | if ( nextArg >= args.size() ) { |
---|
[452747a] | 657 | ArgPack newResult{ |
---|
| 658 | results[i].env, results[i].need, results[i].have, |
---|
[403b388] | 659 | results[i].openVars }; |
---|
[a8b27c6] | 660 | newResult.nextArg = nextArg; |
---|
[403b388] | 661 | Type* argType; |
---|
| 662 | |
---|
[7faab5e] | 663 | if ( nTuples > 0 || ! results[i].expr ) { |
---|
[ad51cc2] | 664 | // first iteration or no expression to clone, |
---|
[7faab5e] | 665 | // push empty tuple expression |
---|
[403b388] | 666 | newResult.parent = i; |
---|
| 667 | std::list<Expression*> emptyList; |
---|
| 668 | newResult.expr.reset( new TupleExpr( emptyList ) ); |
---|
| 669 | argType = newResult.expr->get_result(); |
---|
[aeb75b1] | 670 | } else { |
---|
[403b388] | 671 | // clone result to collect tuple |
---|
| 672 | newResult.parent = results[i].parent; |
---|
| 673 | newResult.cost = results[i].cost; |
---|
| 674 | newResult.tupleStart = results[i].tupleStart; |
---|
| 675 | newResult.expr.reset( results[i].expr->clone() ); |
---|
| 676 | argType = newResult.expr->get_result(); |
---|
| 677 | |
---|
| 678 | if ( results[i].tupleStart > 0 && Tuples::isTtype( argType ) ) { |
---|
[452747a] | 679 | // the case where a ttype value is passed directly is special, |
---|
[403b388] | 680 | // e.g. for argument forwarding purposes |
---|
[452747a] | 681 | // xxx - what if passing multiple arguments, last of which is |
---|
[403b388] | 682 | // ttype? |
---|
[452747a] | 683 | // xxx - what would happen if unify was changed so that unifying |
---|
| 684 | // tuple |
---|
| 685 | // types flattened both before unifying lists? then pass in |
---|
[403b388] | 686 | // TupleType (ttype) below. |
---|
| 687 | --newResult.tupleStart; |
---|
| 688 | } else { |
---|
| 689 | // collapse leftover arguments into tuple |
---|
| 690 | newResult.endTuple( results ); |
---|
| 691 | argType = newResult.expr->get_result(); |
---|
| 692 | } |
---|
[aeb75b1] | 693 | } |
---|
[403b388] | 694 | |
---|
[aeb75b1] | 695 | // check unification for ttype before adding to final |
---|
[452747a] | 696 | if ( unify( ttype, argType, newResult.env, newResult.need, newResult.have, |
---|
[403b388] | 697 | newResult.openVars, indexer ) ) { |
---|
| 698 | finalResults.push_back( move(newResult) ); |
---|
[aeb75b1] | 699 | } |
---|
[452747a] | 700 | |
---|
[aeb75b1] | 701 | continue; |
---|
| 702 | } |
---|
| 703 | |
---|
| 704 | // add each possible next argument |
---|
[a8b27c6] | 705 | for ( std::size_t j = 0; j < args[nextArg].size(); ++j ) { |
---|
| 706 | const ExplodedActual& expl = args[nextArg][j]; |
---|
[178e4ec] | 707 | |
---|
[403b388] | 708 | // fresh copies of parent parameters for this iteration |
---|
| 709 | TypeEnvironment env = results[i].env; |
---|
| 710 | OpenVarSet openVars = results[i].openVars; |
---|
| 711 | |
---|
[a8b27c6] | 712 | env.addActual( expl.env, openVars ); |
---|
[11094d9] | 713 | |
---|
[a8b27c6] | 714 | // skip empty tuple arguments by (near-)cloning parent into next gen |
---|
[62194cb] | 715 | if ( expl.exprs.empty() ) { |
---|
[73a5cadb] | 716 | results.emplace_back( |
---|
[452747a] | 717 | results[i], move(env), copy(results[i].need), |
---|
[a8b27c6] | 718 | copy(results[i].have), move(openVars), nextArg + 1, expl.cost ); |
---|
[452747a] | 719 | |
---|
[403b388] | 720 | continue; |
---|
[4b6ef70] | 721 | } |
---|
[11094d9] | 722 | |
---|
[403b388] | 723 | // add new result |
---|
| 724 | results.emplace_back( |
---|
[178e4ec] | 725 | i, expl.exprs.front().get(), move(env), copy(results[i].need), |
---|
| 726 | copy(results[i].have), move(openVars), nextArg + 1, |
---|
[62194cb] | 727 | nTuples, expl.cost, expl.exprs.size() == 1 ? 0 : 1, j ); |
---|
[aeb75b1] | 728 | } |
---|
| 729 | } |
---|
| 730 | |
---|
| 731 | // reset for next round |
---|
[403b388] | 732 | genStart = genEnd; |
---|
| 733 | nTuples = 0; |
---|
| 734 | } while ( genEnd != results.size() ); |
---|
| 735 | |
---|
| 736 | // splice final results onto results |
---|
| 737 | for ( std::size_t i = 0; i < finalResults.size(); ++i ) { |
---|
| 738 | results.push_back( move(finalResults[i]) ); |
---|
[aeb75b1] | 739 | } |
---|
[403b388] | 740 | return ! finalResults.empty(); |
---|
[aeb75b1] | 741 | } |
---|
[11094d9] | 742 | |
---|
[aeb75b1] | 743 | // iterate each current subresult |
---|
[403b388] | 744 | std::size_t genEnd = results.size(); |
---|
| 745 | for ( std::size_t i = genStart; i < genEnd; ++i ) { |
---|
[a8b27c6] | 746 | auto nextArg = results[i].nextArg; |
---|
| 747 | |
---|
[403b388] | 748 | // use remainder of exploded tuple if present |
---|
[a8b27c6] | 749 | if ( results[i].hasExpl() ) { |
---|
| 750 | const ExplodedActual& expl = results[i].getExpl( args ); |
---|
[62194cb] | 751 | Expression* expr = expl.exprs[results[i].nextExpl].get(); |
---|
[452747a] | 752 | |
---|
[403b388] | 753 | TypeEnvironment env = results[i].env; |
---|
| 754 | AssertionSet need = results[i].need, have = results[i].have; |
---|
| 755 | OpenVarSet openVars = results[i].openVars; |
---|
[4b6ef70] | 756 | |
---|
[62194cb] | 757 | Type* actualType = expr->get_result(); |
---|
[4b6ef70] | 758 | |
---|
| 759 | PRINT( |
---|
| 760 | std::cerr << "formal type is "; |
---|
| 761 | formalType->print( std::cerr ); |
---|
| 762 | std::cerr << std::endl << "actual type is "; |
---|
| 763 | actualType->print( std::cerr ); |
---|
| 764 | std::cerr << std::endl; |
---|
| 765 | ) |
---|
[11094d9] | 766 | |
---|
[403b388] | 767 | if ( unify( formalType, actualType, env, need, have, openVars, indexer ) ) { |
---|
[a8b27c6] | 768 | unsigned nextExpl = results[i].nextExpl + 1; |
---|
[62194cb] | 769 | if ( nextExpl == expl.exprs.size() ) { |
---|
[a8b27c6] | 770 | nextExpl = 0; |
---|
| 771 | } |
---|
[178e4ec] | 772 | |
---|
[452747a] | 773 | results.emplace_back( |
---|
[178e4ec] | 774 | i, expr, move(env), move(need), move(have), move(openVars), nextArg, |
---|
[62194cb] | 775 | nTuples, Cost::zero, nextExpl, results[i].explAlt ); |
---|
[4b6ef70] | 776 | } |
---|
| 777 | |
---|
| 778 | continue; |
---|
[403b388] | 779 | } |
---|
[452747a] | 780 | |
---|
[403b388] | 781 | // use default initializers if out of arguments |
---|
[a8b27c6] | 782 | if ( nextArg >= args.size() ) { |
---|
[aeb75b1] | 783 | if ( ConstantExpr* cnstExpr = getDefaultValue( initializer ) ) { |
---|
| 784 | if ( Constant* cnst = dynamic_cast<Constant*>( cnstExpr->get_constant() ) ) { |
---|
[403b388] | 785 | TypeEnvironment env = results[i].env; |
---|
| 786 | AssertionSet need = results[i].need, have = results[i].have; |
---|
| 787 | OpenVarSet openVars = results[i].openVars; |
---|
| 788 | |
---|
[452747a] | 789 | if ( unify( formalType, cnst->get_type(), env, need, have, openVars, |
---|
[403b388] | 790 | indexer ) ) { |
---|
| 791 | results.emplace_back( |
---|
[0f79853] | 792 | i, new DefaultArgExpr( cnstExpr ), move(env), move(need), move(have), |
---|
[a8b27c6] | 793 | move(openVars), nextArg, nTuples ); |
---|
[aeb75b1] | 794 | } |
---|
| 795 | } |
---|
| 796 | } |
---|
[403b388] | 797 | |
---|
[aeb75b1] | 798 | continue; |
---|
| 799 | } |
---|
| 800 | |
---|
| 801 | // Check each possible next argument |
---|
[a8b27c6] | 802 | for ( std::size_t j = 0; j < args[nextArg].size(); ++j ) { |
---|
| 803 | const ExplodedActual& expl = args[nextArg][j]; |
---|
| 804 | |
---|
[403b388] | 805 | // fresh copies of parent parameters for this iteration |
---|
| 806 | TypeEnvironment env = results[i].env; |
---|
| 807 | AssertionSet need = results[i].need, have = results[i].have; |
---|
| 808 | OpenVarSet openVars = results[i].openVars; |
---|
| 809 | |
---|
[a8b27c6] | 810 | env.addActual( expl.env, openVars ); |
---|
[4b6ef70] | 811 | |
---|
[a8b27c6] | 812 | // skip empty tuple arguments by (near-)cloning parent into next gen |
---|
[62194cb] | 813 | if ( expl.exprs.empty() ) { |
---|
[73a5cadb] | 814 | results.emplace_back( |
---|
[178e4ec] | 815 | results[i], move(env), move(need), move(have), move(openVars), |
---|
[a8b27c6] | 816 | nextArg + 1, expl.cost ); |
---|
[73a5cadb] | 817 | |
---|
[4b6ef70] | 818 | continue; |
---|
| 819 | } |
---|
[aeb75b1] | 820 | |
---|
[4b6ef70] | 821 | // consider only first exploded actual |
---|
[62194cb] | 822 | Expression* expr = expl.exprs.front().get(); |
---|
[3d2ae8d] | 823 | Type* actualType = expr->result->clone(); |
---|
[a585396] | 824 | |
---|
[4b6ef70] | 825 | PRINT( |
---|
| 826 | std::cerr << "formal type is "; |
---|
| 827 | formalType->print( std::cerr ); |
---|
| 828 | std::cerr << std::endl << "actual type is "; |
---|
| 829 | actualType->print( std::cerr ); |
---|
| 830 | std::cerr << std::endl; |
---|
| 831 | ) |
---|
[aeb75b1] | 832 | |
---|
[4b6ef70] | 833 | // attempt to unify types |
---|
[403b388] | 834 | if ( unify( formalType, actualType, env, need, have, openVars, indexer ) ) { |
---|
| 835 | // add new result |
---|
| 836 | results.emplace_back( |
---|
[178e4ec] | 837 | i, expr, move(env), move(need), move(have), move(openVars), nextArg + 1, |
---|
[62194cb] | 838 | nTuples, expl.cost, expl.exprs.size() == 1 ? 0 : 1, j ); |
---|
[4b6ef70] | 839 | } |
---|
[aeb75b1] | 840 | } |
---|
| 841 | } |
---|
| 842 | |
---|
| 843 | // reset for next parameter |
---|
[403b388] | 844 | genStart = genEnd; |
---|
[11094d9] | 845 | |
---|
[403b388] | 846 | return genEnd != results.size(); |
---|
| 847 | } |
---|
| 848 | |
---|
| 849 | template<typename OutputIterator> |
---|
[13deae88] | 850 | void AlternativeFinder::Finder::validateFunctionAlternative( const Alternative &func, ArgPack& result, |
---|
[403b388] | 851 | const std::vector<ArgPack>& results, OutputIterator out ) { |
---|
| 852 | ApplicationExpr *appExpr = new ApplicationExpr( func.expr->clone() ); |
---|
| 853 | // sum cost and accumulate actuals |
---|
[3d2ae8d] | 854 | std::list<Expression*>& args = appExpr->args; |
---|
[8a62d04] | 855 | Cost cost = func.cost; |
---|
[403b388] | 856 | const ArgPack* pack = &result; |
---|
| 857 | while ( pack->expr ) { |
---|
| 858 | args.push_front( pack->expr->clone() ); |
---|
| 859 | cost += pack->cost; |
---|
| 860 | pack = &results[pack->parent]; |
---|
| 861 | } |
---|
| 862 | // build and validate new alternative |
---|
[2c187378] | 863 | Alternative newAlt{ appExpr, result.env, result.openVars, result.need, cost }; |
---|
[403b388] | 864 | PRINT( |
---|
| 865 | std::cerr << "instantiate function success: " << appExpr << std::endl; |
---|
| 866 | std::cerr << "need assertions:" << std::endl; |
---|
| 867 | printAssertionSet( result.need, std::cerr, 8 ); |
---|
| 868 | ) |
---|
[0b00df0] | 869 | inferParameters( newAlt, out ); |
---|
[11094d9] | 870 | } |
---|
[aeb75b1] | 871 | |
---|
| 872 | template<typename OutputIterator> |
---|
[13deae88] | 873 | void AlternativeFinder::Finder::makeFunctionAlternatives( const Alternative &func, |
---|
[a8b27c6] | 874 | FunctionType *funcType, const ExplodedArgs &args, OutputIterator out ) { |
---|
[aeb75b1] | 875 | OpenVarSet funcOpenVars; |
---|
| 876 | AssertionSet funcNeed, funcHave; |
---|
[3f7e12cb] | 877 | TypeEnvironment funcEnv( func.env ); |
---|
[aeb75b1] | 878 | makeUnifiableVars( funcType, funcOpenVars, funcNeed ); |
---|
[11094d9] | 879 | // add all type variables as open variables now so that those not used in the parameter |
---|
[aeb75b1] | 880 | // list are still considered open. |
---|
[3d2ae8d] | 881 | funcEnv.add( funcType->forall ); |
---|
[11094d9] | 882 | |
---|
[3d2ae8d] | 883 | if ( targetType && ! targetType->isVoid() && ! funcType->returnVals.empty() ) { |
---|
[ea83e00a] | 884 | // attempt to narrow based on expected target type |
---|
[3d2ae8d] | 885 | Type * returnType = funcType->returnVals.front()->get_type(); |
---|
[11094d9] | 886 | if ( ! unify( returnType, targetType, funcEnv, funcNeed, funcHave, funcOpenVars, |
---|
[aeb75b1] | 887 | indexer ) ) { |
---|
| 888 | // unification failed, don't pursue this function alternative |
---|
[ea83e00a] | 889 | return; |
---|
| 890 | } |
---|
| 891 | } |
---|
| 892 | |
---|
[aeb75b1] | 893 | // iteratively build matches, one parameter at a time |
---|
[403b388] | 894 | std::vector<ArgPack> results; |
---|
| 895 | results.push_back( ArgPack{ funcEnv, funcNeed, funcHave, funcOpenVars } ); |
---|
| 896 | std::size_t genStart = 0; |
---|
| 897 | |
---|
[3d2ae8d] | 898 | for ( DeclarationWithType* formal : funcType->parameters ) { |
---|
[aeb75b1] | 899 | ObjectDecl* obj = strict_dynamic_cast< ObjectDecl* >( formal ); |
---|
[11094d9] | 900 | if ( ! instantiateArgument( |
---|
[3d2ae8d] | 901 | obj->type, obj->init, args, results, genStart, indexer ) ) |
---|
[aeb75b1] | 902 | return; |
---|
| 903 | } |
---|
| 904 | |
---|
| 905 | if ( funcType->get_isVarArgs() ) { |
---|
[403b388] | 906 | // append any unused arguments to vararg pack |
---|
| 907 | std::size_t genEnd; |
---|
| 908 | do { |
---|
| 909 | genEnd = results.size(); |
---|
| 910 | |
---|
| 911 | // iterate results |
---|
| 912 | for ( std::size_t i = genStart; i < genEnd; ++i ) { |
---|
[a8b27c6] | 913 | auto nextArg = results[i].nextArg; |
---|
[452747a] | 914 | |
---|
[403b388] | 915 | // use remainder of exploded tuple if present |
---|
[a8b27c6] | 916 | if ( results[i].hasExpl() ) { |
---|
| 917 | const ExplodedActual& expl = results[i].getExpl( args ); |
---|
[403b388] | 918 | |
---|
[a8b27c6] | 919 | unsigned nextExpl = results[i].nextExpl + 1; |
---|
[62194cb] | 920 | if ( nextExpl == expl.exprs.size() ) { |
---|
[a8b27c6] | 921 | nextExpl = 0; |
---|
| 922 | } |
---|
[403b388] | 923 | |
---|
| 924 | results.emplace_back( |
---|
[178e4ec] | 925 | i, expl.exprs[results[i].nextExpl].get(), copy(results[i].env), |
---|
| 926 | copy(results[i].need), copy(results[i].have), |
---|
| 927 | copy(results[i].openVars), nextArg, 0, Cost::zero, nextExpl, |
---|
[62194cb] | 928 | results[i].explAlt ); |
---|
[452747a] | 929 | |
---|
[403b388] | 930 | continue; |
---|
| 931 | } |
---|
| 932 | |
---|
| 933 | // finish result when out of arguments |
---|
[a8b27c6] | 934 | if ( nextArg >= args.size() ) { |
---|
[403b388] | 935 | validateFunctionAlternative( func, results[i], results, out ); |
---|
[fae6f21] | 936 | |
---|
[aeb75b1] | 937 | continue; |
---|
| 938 | } |
---|
| 939 | |
---|
| 940 | // add each possible next argument |
---|
[a8b27c6] | 941 | for ( std::size_t j = 0; j < args[nextArg].size(); ++j ) { |
---|
| 942 | const ExplodedActual& expl = args[nextArg][j]; |
---|
| 943 | |
---|
[403b388] | 944 | // fresh copies of parent parameters for this iteration |
---|
| 945 | TypeEnvironment env = results[i].env; |
---|
| 946 | OpenVarSet openVars = results[i].openVars; |
---|
| 947 | |
---|
[a8b27c6] | 948 | env.addActual( expl.env, openVars ); |
---|
[d551d0a] | 949 | |
---|
[a8b27c6] | 950 | // skip empty tuple arguments by (near-)cloning parent into next gen |
---|
[62194cb] | 951 | if ( expl.exprs.empty() ) { |
---|
[452747a] | 952 | results.emplace_back( |
---|
| 953 | results[i], move(env), copy(results[i].need), |
---|
[a8b27c6] | 954 | copy(results[i].have), move(openVars), nextArg + 1, expl.cost ); |
---|
[178e4ec] | 955 | |
---|
[403b388] | 956 | continue; |
---|
| 957 | } |
---|
[d551d0a] | 958 | |
---|
[403b388] | 959 | // add new result |
---|
| 960 | results.emplace_back( |
---|
[178e4ec] | 961 | i, expl.exprs.front().get(), move(env), copy(results[i].need), |
---|
| 962 | copy(results[i].have), move(openVars), nextArg + 1, 0, |
---|
[62194cb] | 963 | expl.cost, expl.exprs.size() == 1 ? 0 : 1, j ); |
---|
[aeb75b1] | 964 | } |
---|
| 965 | } |
---|
| 966 | |
---|
[403b388] | 967 | genStart = genEnd; |
---|
| 968 | } while ( genEnd != results.size() ); |
---|
[aeb75b1] | 969 | } else { |
---|
| 970 | // filter out results that don't use all the arguments |
---|
[403b388] | 971 | for ( std::size_t i = genStart; i < results.size(); ++i ) { |
---|
| 972 | ArgPack& result = results[i]; |
---|
[a8b27c6] | 973 | if ( ! result.hasExpl() && result.nextArg >= args.size() ) { |
---|
[403b388] | 974 | validateFunctionAlternative( func, result, results, out ); |
---|
[aeb75b1] | 975 | } |
---|
| 976 | } |
---|
| 977 | } |
---|
[d9a0e76] | 978 | } |
---|
| 979 | |
---|
[13deae88] | 980 | void AlternativeFinder::Finder::postvisit( UntypedExpr *untypedExpr ) { |
---|
[6ccfb7f] | 981 | AlternativeFinder funcFinder( indexer, env ); |
---|
[3d2ae8d] | 982 | funcFinder.findWithAdjustment( untypedExpr->function ); |
---|
[6ccfb7f] | 983 | // if there are no function alternatives, then proceeding is a waste of time. |
---|
[630bcb5] | 984 | // xxx - findWithAdjustment throws, so this check and others like it shouldn't be necessary. |
---|
[6ccfb7f] | 985 | if ( funcFinder.alternatives.empty() ) return; |
---|
| 986 | |
---|
[aeb75b1] | 987 | std::vector< AlternativeFinder > argAlternatives; |
---|
[13deae88] | 988 | altFinder.findSubExprs( untypedExpr->begin_args(), untypedExpr->end_args(), |
---|
[aeb75b1] | 989 | back_inserter( argAlternatives ) ); |
---|
[d9a0e76] | 990 | |
---|
[5af62f1] | 991 | // take care of possible tuple assignments |
---|
| 992 | // if not tuple assignment, assignment is taken care of as a normal function call |
---|
[13deae88] | 993 | Tuples::handleTupleAssignment( altFinder, untypedExpr, argAlternatives ); |
---|
[c43c171] | 994 | |
---|
[6ccfb7f] | 995 | // find function operators |
---|
[4e66a18] | 996 | static NameExpr *opExpr = new NameExpr( "?()" ); |
---|
[6ccfb7f] | 997 | AlternativeFinder funcOpFinder( indexer, env ); |
---|
[4e66a18] | 998 | // it's ok if there aren't any defined function ops |
---|
[00ac42e] | 999 | funcOpFinder.maybeFind( opExpr ); |
---|
[6ccfb7f] | 1000 | PRINT( |
---|
| 1001 | std::cerr << "known function ops:" << std::endl; |
---|
[50377a4] | 1002 | printAlts( funcOpFinder.alternatives, std::cerr, 1 ); |
---|
[6ccfb7f] | 1003 | ) |
---|
| 1004 | |
---|
[a8b27c6] | 1005 | // pre-explode arguments |
---|
| 1006 | ExplodedArgs argExpansions; |
---|
| 1007 | argExpansions.reserve( argAlternatives.size() ); |
---|
| 1008 | |
---|
| 1009 | for ( const AlternativeFinder& arg : argAlternatives ) { |
---|
| 1010 | argExpansions.emplace_back(); |
---|
| 1011 | auto& argE = argExpansions.back(); |
---|
[d286cf68] | 1012 | // argE.reserve( arg.alternatives.size() ); |
---|
[178e4ec] | 1013 | |
---|
[a8b27c6] | 1014 | for ( const Alternative& actual : arg ) { |
---|
| 1015 | argE.emplace_back( actual, indexer ); |
---|
| 1016 | } |
---|
| 1017 | } |
---|
| 1018 | |
---|
[a32b204] | 1019 | AltList candidates; |
---|
[a16764a6] | 1020 | SemanticErrorException errors; |
---|
[b1bead1] | 1021 | for ( AltList::iterator func = funcFinder.alternatives.begin(); func != funcFinder.alternatives.end(); ++func ) { |
---|
[91b8a17] | 1022 | try { |
---|
| 1023 | PRINT( |
---|
| 1024 | std::cerr << "working on alternative: " << std::endl; |
---|
| 1025 | func->print( std::cerr, 8 ); |
---|
| 1026 | ) |
---|
| 1027 | // check if the type is pointer to function |
---|
[3d2ae8d] | 1028 | if ( PointerType *pointer = dynamic_cast< PointerType* >( func->expr->result->stripReferences() ) ) { |
---|
| 1029 | if ( FunctionType *function = dynamic_cast< FunctionType* >( pointer->base ) ) { |
---|
[326338ae] | 1030 | Alternative newFunc( *func ); |
---|
[a181494] | 1031 | referenceToRvalueConversion( newFunc.expr, newFunc.cost ); |
---|
[a8b27c6] | 1032 | makeFunctionAlternatives( newFunc, function, argExpansions, |
---|
[aeb75b1] | 1033 | std::back_inserter( candidates ) ); |
---|
[b1bead1] | 1034 | } |
---|
[3d2ae8d] | 1035 | } else if ( TypeInstType *typeInst = dynamic_cast< TypeInstType* >( func->expr->result->stripReferences() ) ) { // handle ftype (e.g. *? on function pointer) |
---|
[00ac42e] | 1036 | if ( const EqvClass *eqvClass = func->env.lookup( typeInst->name ) ) { |
---|
| 1037 | if ( FunctionType *function = dynamic_cast< FunctionType* >( eqvClass->type ) ) { |
---|
[326338ae] | 1038 | Alternative newFunc( *func ); |
---|
[a181494] | 1039 | referenceToRvalueConversion( newFunc.expr, newFunc.cost ); |
---|
[a8b27c6] | 1040 | makeFunctionAlternatives( newFunc, function, argExpansions, |
---|
[aeb75b1] | 1041 | std::back_inserter( candidates ) ); |
---|
[a32b204] | 1042 | } // if |
---|
| 1043 | } // if |
---|
[11094d9] | 1044 | } |
---|
[a16764a6] | 1045 | } catch ( SemanticErrorException &e ) { |
---|
[91b8a17] | 1046 | errors.append( e ); |
---|
| 1047 | } |
---|
[a32b204] | 1048 | } // for |
---|
| 1049 | |
---|
[aeb75b1] | 1050 | // try each function operator ?() with each function alternative |
---|
| 1051 | if ( ! funcOpFinder.alternatives.empty() ) { |
---|
[a8b27c6] | 1052 | // add exploded function alternatives to front of argument list |
---|
| 1053 | std::vector<ExplodedActual> funcE; |
---|
| 1054 | funcE.reserve( funcFinder.alternatives.size() ); |
---|
| 1055 | for ( const Alternative& actual : funcFinder ) { |
---|
| 1056 | funcE.emplace_back( actual, indexer ); |
---|
| 1057 | } |
---|
| 1058 | argExpansions.insert( argExpansions.begin(), move(funcE) ); |
---|
[aeb75b1] | 1059 | |
---|
| 1060 | for ( AltList::iterator funcOp = funcOpFinder.alternatives.begin(); |
---|
| 1061 | funcOp != funcOpFinder.alternatives.end(); ++funcOp ) { |
---|
| 1062 | try { |
---|
| 1063 | // check if type is a pointer to function |
---|
[11094d9] | 1064 | if ( PointerType* pointer = dynamic_cast<PointerType*>( |
---|
[3d2ae8d] | 1065 | funcOp->expr->result->stripReferences() ) ) { |
---|
[11094d9] | 1066 | if ( FunctionType* function = |
---|
[3d2ae8d] | 1067 | dynamic_cast<FunctionType*>( pointer->base ) ) { |
---|
[aeb75b1] | 1068 | Alternative newFunc( *funcOp ); |
---|
[a181494] | 1069 | referenceToRvalueConversion( newFunc.expr, newFunc.cost ); |
---|
[a8b27c6] | 1070 | makeFunctionAlternatives( newFunc, function, argExpansions, |
---|
[aeb75b1] | 1071 | std::back_inserter( candidates ) ); |
---|
| 1072 | } |
---|
| 1073 | } |
---|
[a16764a6] | 1074 | } catch ( SemanticErrorException &e ) { |
---|
[aeb75b1] | 1075 | errors.append( e ); |
---|
| 1076 | } |
---|
| 1077 | } |
---|
| 1078 | } |
---|
| 1079 | |
---|
[91b8a17] | 1080 | // Implement SFINAE; resolution errors are only errors if there aren't any non-erroneous resolutions |
---|
| 1081 | if ( candidates.empty() && ! errors.isEmpty() ) { throw errors; } |
---|
| 1082 | |
---|
[4b0f997] | 1083 | // compute conversionsion costs |
---|
[bd4f2e9] | 1084 | for ( Alternative& withFunc : candidates ) { |
---|
| 1085 | Cost cvtCost = computeApplicationConversionCost( withFunc, indexer ); |
---|
[a32b204] | 1086 | |
---|
| 1087 | PRINT( |
---|
[bd4f2e9] | 1088 | ApplicationExpr *appExpr = strict_dynamic_cast< ApplicationExpr* >( withFunc.expr ); |
---|
[3d2ae8d] | 1089 | PointerType *pointer = strict_dynamic_cast< PointerType* >( appExpr->function->result ); |
---|
| 1090 | FunctionType *function = strict_dynamic_cast< FunctionType* >( pointer->base ); |
---|
| 1091 | std::cerr << "Case +++++++++++++ " << appExpr->function << std::endl; |
---|
[6ed1d4b] | 1092 | std::cerr << "formals are:" << std::endl; |
---|
[3d2ae8d] | 1093 | printAll( function->parameters, std::cerr, 8 ); |
---|
[6ed1d4b] | 1094 | std::cerr << "actuals are:" << std::endl; |
---|
[3d2ae8d] | 1095 | printAll( appExpr->args, std::cerr, 8 ); |
---|
[6ed1d4b] | 1096 | std::cerr << "bindings are:" << std::endl; |
---|
[bd4f2e9] | 1097 | withFunc.env.print( std::cerr, 8 ); |
---|
[04cccaf] | 1098 | std::cerr << "cost is: " << withFunc.cost << std::endl; |
---|
[6ed1d4b] | 1099 | std::cerr << "cost of conversion is:" << cvtCost << std::endl; |
---|
[7c64920] | 1100 | ) |
---|
| 1101 | if ( cvtCost != Cost::infinity ) { |
---|
[bd4f2e9] | 1102 | withFunc.cvtCost = cvtCost; |
---|
| 1103 | alternatives.push_back( withFunc ); |
---|
[7c64920] | 1104 | } // if |
---|
[a32b204] | 1105 | } // for |
---|
[4b0f997] | 1106 | |
---|
[bd4f2e9] | 1107 | candidates = move(alternatives); |
---|
[a32b204] | 1108 | |
---|
[11094d9] | 1109 | // use a new list so that alternatives are not examined by addAnonConversions twice. |
---|
| 1110 | AltList winners; |
---|
| 1111 | findMinCost( candidates.begin(), candidates.end(), std::back_inserter( winners ) ); |
---|
[ea83e00a] | 1112 | |
---|
[452747a] | 1113 | // function may return struct or union value, in which case we need to add alternatives |
---|
[73ac10e] | 1114 | // for implicit conversions to each of the anonymous members, must happen after findMinCost |
---|
[bd4f2e9] | 1115 | // since anon conversions are never the cheapest expression |
---|
[11094d9] | 1116 | for ( const Alternative & alt : winners ) { |
---|
[ca946a4] | 1117 | addAnonConversions( alt ); |
---|
| 1118 | } |
---|
[bd4f2e9] | 1119 | spliceBegin( alternatives, winners ); |
---|
[ca946a4] | 1120 | |
---|
[ea83e00a] | 1121 | if ( alternatives.empty() && targetType && ! targetType->isVoid() ) { |
---|
| 1122 | // xxx - this is a temporary hack. If resolution is unsuccessful with a target type, try again without a |
---|
| 1123 | // target type, since it will sometimes succeed when it wouldn't easily with target type binding. For example, |
---|
| 1124 | // forall( otype T ) lvalue T ?[?]( T *, ptrdiff_t ); |
---|
| 1125 | // const char * x = "hello world"; |
---|
| 1126 | // unsigned char ch = x[0]; |
---|
| 1127 | // Fails with simple return type binding. First, T is bound to unsigned char, then (x: const char *) is unified |
---|
| 1128 | // with unsigned char *, which fails because pointer base types must be unified exactly. The new resolver should |
---|
| 1129 | // fix this issue in a more robust way. |
---|
| 1130 | targetType = nullptr; |
---|
[13deae88] | 1131 | postvisit( untypedExpr ); |
---|
[ea83e00a] | 1132 | } |
---|
[a32b204] | 1133 | } |
---|
| 1134 | |
---|
| 1135 | bool isLvalue( Expression *expr ) { |
---|
[906e24d] | 1136 | // xxx - recurse into tuples? |
---|
[3d2ae8d] | 1137 | return expr->result && ( expr->result->get_lvalue() || dynamic_cast< ReferenceType * >( expr->result ) ); |
---|
[a32b204] | 1138 | } |
---|
| 1139 | |
---|
[13deae88] | 1140 | void AlternativeFinder::Finder::postvisit( AddressExpr *addressExpr ) { |
---|
[a32b204] | 1141 | AlternativeFinder finder( indexer, env ); |
---|
| 1142 | finder.find( addressExpr->get_arg() ); |
---|
[bd4f2e9] | 1143 | for ( Alternative& alt : finder.alternatives ) { |
---|
| 1144 | if ( isLvalue( alt.expr ) ) { |
---|
[452747a] | 1145 | alternatives.push_back( |
---|
[6d6e829] | 1146 | Alternative{ alt, new AddressExpr( alt.expr->clone() ), alt.cost } ); |
---|
[a32b204] | 1147 | } // if |
---|
| 1148 | } // for |
---|
| 1149 | } |
---|
| 1150 | |
---|
[13deae88] | 1151 | void AlternativeFinder::Finder::postvisit( LabelAddressExpr * expr ) { |
---|
[6d6e829] | 1152 | alternatives.push_back( Alternative{ expr->clone(), env } ); |
---|
[5809461] | 1153 | } |
---|
| 1154 | |
---|
[c0bf94e] | 1155 | Expression * restructureCast( Expression * argExpr, Type * toType, bool isGenerated ) { |
---|
[e6cee92] | 1156 | if ( argExpr->get_result()->size() > 1 && ! toType->isVoid() && ! dynamic_cast<ReferenceType *>( toType ) ) { |
---|
| 1157 | // Argument expression is a tuple and the target type is not void and not a reference type. |
---|
| 1158 | // Cast each member of the tuple to its corresponding target type, producing the tuple of those |
---|
| 1159 | // cast expressions. If there are more components of the tuple than components in the target type, |
---|
| 1160 | // then excess components do not come out in the result expression (but UniqueExprs ensure that |
---|
| 1161 | // side effects will still be done). |
---|
[5ccb10d] | 1162 | if ( Tuples::maybeImpureIgnoreUnique( argExpr ) ) { |
---|
[62423350] | 1163 | // expressions which may contain side effects require a single unique instance of the expression. |
---|
| 1164 | argExpr = new UniqueExpr( argExpr ); |
---|
| 1165 | } |
---|
| 1166 | std::list< Expression * > componentExprs; |
---|
| 1167 | for ( unsigned int i = 0; i < toType->size(); i++ ) { |
---|
| 1168 | // cast each component |
---|
| 1169 | TupleIndexExpr * idx = new TupleIndexExpr( argExpr->clone(), i ); |
---|
[c0bf94e] | 1170 | componentExprs.push_back( restructureCast( idx, toType->getComponent( i ), isGenerated ) ); |
---|
[62423350] | 1171 | } |
---|
| 1172 | delete argExpr; |
---|
| 1173 | assert( componentExprs.size() > 0 ); |
---|
| 1174 | // produce the tuple of casts |
---|
| 1175 | return new TupleExpr( componentExprs ); |
---|
| 1176 | } else { |
---|
| 1177 | // handle normally |
---|
[c0bf94e] | 1178 | CastExpr * ret = new CastExpr( argExpr, toType->clone() ); |
---|
| 1179 | ret->isGenerated = isGenerated; |
---|
| 1180 | return ret; |
---|
[62423350] | 1181 | } |
---|
| 1182 | } |
---|
| 1183 | |
---|
[13deae88] | 1184 | void AlternativeFinder::Finder::postvisit( CastExpr *castExpr ) { |
---|
[906e24d] | 1185 | Type *& toType = castExpr->get_result(); |
---|
[7933351] | 1186 | assert( toType ); |
---|
[906e24d] | 1187 | toType = resolveTypeof( toType, indexer ); |
---|
| 1188 | SymTab::validateType( toType, &indexer ); |
---|
| 1189 | adjustExprType( toType, env, indexer ); |
---|
[a32b204] | 1190 | |
---|
| 1191 | AlternativeFinder finder( indexer, env ); |
---|
[7933351] | 1192 | finder.targetType = toType; |
---|
[95642c9] | 1193 | finder.findWithAdjustment( castExpr->arg ); |
---|
[a32b204] | 1194 | |
---|
| 1195 | AltList candidates; |
---|
[452747a] | 1196 | for ( Alternative & alt : finder.alternatives ) { |
---|
[6d6e829] | 1197 | AssertionSet needAssertions( alt.need.begin(), alt.need.end() ); |
---|
| 1198 | AssertionSet haveAssertions; |
---|
| 1199 | OpenVarSet openVars{ alt.openVars }; |
---|
[a32b204] | 1200 | |
---|
[a8706fc] | 1201 | alt.env.extractOpenVars( openVars ); |
---|
| 1202 | |
---|
[a32b204] | 1203 | // It's possible that a cast can throw away some values in a multiply-valued expression. (An example is a |
---|
| 1204 | // cast-to-void, which casts from one value to zero.) Figure out the prefix of the subexpression results |
---|
| 1205 | // that are cast directly. The candidate is invalid if it has fewer results than there are types to cast |
---|
| 1206 | // to. |
---|
[95642c9] | 1207 | int discardedValues = alt.expr->result->size() - castExpr->result->size(); |
---|
[a32b204] | 1208 | if ( discardedValues < 0 ) continue; |
---|
[7933351] | 1209 | // xxx - may need to go into tuple types and extract relevant types and use unifyList. Note that currently, this does not |
---|
| 1210 | // allow casting a tuple to an atomic type (e.g. (int)([1, 2, 3])) |
---|
[adcdd2f] | 1211 | // unification run for side-effects |
---|
[95642c9] | 1212 | unify( castExpr->result, alt.expr->result, alt.env, needAssertions, |
---|
[bd4f2e9] | 1213 | haveAssertions, openVars, indexer ); |
---|
[95642c9] | 1214 | Cost thisCost = castCost( alt.expr->result, castExpr->result, indexer, |
---|
[bd4f2e9] | 1215 | alt.env ); |
---|
[7e4c4f4] | 1216 | PRINT( |
---|
| 1217 | std::cerr << "working on cast with result: " << castExpr->result << std::endl; |
---|
[452747a] | 1218 | std::cerr << "and expr type: " << alt.expr->result << std::endl; |
---|
| 1219 | std::cerr << "env: " << alt.env << std::endl; |
---|
[7e4c4f4] | 1220 | ) |
---|
[a32b204] | 1221 | if ( thisCost != Cost::infinity ) { |
---|
[7e4c4f4] | 1222 | PRINT( |
---|
| 1223 | std::cerr << "has finite cost." << std::endl; |
---|
| 1224 | ) |
---|
[a32b204] | 1225 | // count one safe conversion for each value that is thrown away |
---|
[89be1c68] | 1226 | thisCost.incSafe( discardedValues ); |
---|
[6d6e829] | 1227 | Alternative newAlt{ |
---|
| 1228 | restructureCast( alt.expr->clone(), toType, castExpr->isGenerated ), |
---|
[bd78797] | 1229 | alt.env, openVars, needAssertions, alt.cost, alt.cost + thisCost }; |
---|
[0b00df0] | 1230 | inferParameters( newAlt, back_inserter( candidates ) ); |
---|
[a32b204] | 1231 | } // if |
---|
| 1232 | } // for |
---|
| 1233 | |
---|
| 1234 | // findMinCost selects the alternatives with the lowest "cost" members, but has the side effect of copying the |
---|
| 1235 | // cvtCost member to the cost member (since the old cost is now irrelevant). Thus, calling findMinCost twice |
---|
| 1236 | // selects first based on argument cost, then on conversion cost. |
---|
| 1237 | AltList minArgCost; |
---|
| 1238 | findMinCost( candidates.begin(), candidates.end(), std::back_inserter( minArgCost ) ); |
---|
| 1239 | findMinCost( minArgCost.begin(), minArgCost.end(), std::back_inserter( alternatives ) ); |
---|
| 1240 | } |
---|
| 1241 | |
---|
[13deae88] | 1242 | void AlternativeFinder::Finder::postvisit( VirtualCastExpr * castExpr ) { |
---|
[6d6e829] | 1243 | assertf( castExpr->get_result(), "Implicit virtual cast targets not yet supported." ); |
---|
[a5f0529] | 1244 | AlternativeFinder finder( indexer, env ); |
---|
| 1245 | // don't prune here, since it's guaranteed all alternatives will have the same type |
---|
[4e66a18] | 1246 | finder.findWithoutPrune( castExpr->get_arg() ); |
---|
[a5f0529] | 1247 | for ( Alternative & alt : finder.alternatives ) { |
---|
[6d6e829] | 1248 | alternatives.push_back( Alternative{ |
---|
| 1249 | alt, new VirtualCastExpr{ alt.expr->clone(), castExpr->get_result()->clone() }, |
---|
| 1250 | alt.cost } ); |
---|
[a5f0529] | 1251 | } |
---|
| 1252 | } |
---|
| 1253 | |
---|
[00ac42e] | 1254 | namespace { |
---|
| 1255 | /// Gets name from untyped member expression (member must be NameExpr) |
---|
| 1256 | const std::string& get_member_name( UntypedMemberExpr *memberExpr ) { |
---|
[30ee9efc] | 1257 | if ( dynamic_cast< ConstantExpr * >( memberExpr->get_member() ) ) { |
---|
| 1258 | SemanticError( memberExpr, "Indexed access to struct fields unsupported: " ); |
---|
| 1259 | } // if |
---|
[00ac42e] | 1260 | NameExpr * nameExpr = dynamic_cast< NameExpr * >( memberExpr->get_member() ); |
---|
| 1261 | assert( nameExpr ); |
---|
| 1262 | return nameExpr->get_name(); |
---|
| 1263 | } |
---|
| 1264 | } |
---|
| 1265 | |
---|
[13deae88] | 1266 | void AlternativeFinder::Finder::postvisit( UntypedMemberExpr *memberExpr ) { |
---|
[a32b204] | 1267 | AlternativeFinder funcFinder( indexer, env ); |
---|
| 1268 | funcFinder.findWithAdjustment( memberExpr->get_aggregate() ); |
---|
| 1269 | for ( AltList::const_iterator agg = funcFinder.alternatives.begin(); agg != funcFinder.alternatives.end(); ++agg ) { |
---|
[a61ad31] | 1270 | // it's okay for the aggregate expression to have reference type -- cast it to the base type to treat the aggregate as the referenced value |
---|
[a181494] | 1271 | Cost cost = agg->cost; |
---|
| 1272 | Expression * aggrExpr = agg->expr->clone(); |
---|
| 1273 | referenceToRvalueConversion( aggrExpr, cost ); |
---|
| 1274 | std::unique_ptr<Expression> guard( aggrExpr ); |
---|
| 1275 | |
---|
[a61ad31] | 1276 | // find member of the given type |
---|
| 1277 | if ( StructInstType *structInst = dynamic_cast< StructInstType* >( aggrExpr->get_result() ) ) { |
---|
[6d6e829] | 1278 | addAggMembers( structInst, aggrExpr, *agg, cost, get_member_name(memberExpr) ); |
---|
[a61ad31] | 1279 | } else if ( UnionInstType *unionInst = dynamic_cast< UnionInstType* >( aggrExpr->get_result() ) ) { |
---|
[6d6e829] | 1280 | addAggMembers( unionInst, aggrExpr, *agg, cost, get_member_name(memberExpr) ); |
---|
[a61ad31] | 1281 | } else if ( TupleType * tupleType = dynamic_cast< TupleType * >( aggrExpr->get_result() ) ) { |
---|
[6d6e829] | 1282 | addTupleMembers( tupleType, aggrExpr, *agg, cost, memberExpr->get_member() ); |
---|
[a32b204] | 1283 | } // if |
---|
| 1284 | } // for |
---|
| 1285 | } |
---|
| 1286 | |
---|
[13deae88] | 1287 | void AlternativeFinder::Finder::postvisit( MemberExpr *memberExpr ) { |
---|
[6d6e829] | 1288 | alternatives.push_back( Alternative{ memberExpr->clone(), env } ); |
---|
[a32b204] | 1289 | } |
---|
| 1290 | |
---|
[13deae88] | 1291 | void AlternativeFinder::Finder::postvisit( NameExpr *nameExpr ) { |
---|
[a40d503] | 1292 | std::list< SymTab::Indexer::IdData > declList; |
---|
[490ff5c3] | 1293 | indexer.lookupId( nameExpr->name, declList ); |
---|
| 1294 | PRINT( std::cerr << "nameExpr is " << nameExpr->name << std::endl; ) |
---|
[a40d503] | 1295 | for ( auto & data : declList ) { |
---|
[a181494] | 1296 | Cost cost = Cost::zero; |
---|
| 1297 | Expression * newExpr = data.combine( cost ); |
---|
[5de1e2c] | 1298 | |
---|
| 1299 | // addAnonAlternatives uses vector::push_back, which invalidates references to existing elements, so |
---|
| 1300 | // can't construct in place and use vector::back |
---|
[6d6e829] | 1301 | Alternative newAlt{ newExpr, env, OpenVarSet{}, AssertionList{}, Cost::zero, cost }; |
---|
[0f19d763] | 1302 | PRINT( |
---|
| 1303 | std::cerr << "decl is "; |
---|
[a40d503] | 1304 | data.id->print( std::cerr ); |
---|
[0f19d763] | 1305 | std::cerr << std::endl; |
---|
| 1306 | std::cerr << "newExpr is "; |
---|
[a40d503] | 1307 | newExpr->print( std::cerr ); |
---|
[0f19d763] | 1308 | std::cerr << std::endl; |
---|
[7c64920] | 1309 | ) |
---|
[5de1e2c] | 1310 | renameTypes( newAlt.expr ); |
---|
| 1311 | addAnonConversions( newAlt ); // add anonymous member interpretations whenever an aggregate value type is seen as a name expression. |
---|
| 1312 | alternatives.push_back( std::move(newAlt) ); |
---|
[0f19d763] | 1313 | } // for |
---|
[a32b204] | 1314 | } |
---|
| 1315 | |
---|
[13deae88] | 1316 | void AlternativeFinder::Finder::postvisit( VariableExpr *variableExpr ) { |
---|
[85517ddb] | 1317 | // not sufficient to clone here, because variable's type may have changed |
---|
| 1318 | // since the VariableExpr was originally created. |
---|
[6d6e829] | 1319 | alternatives.push_back( Alternative{ new VariableExpr{ variableExpr->var }, env } ); |
---|
[a32b204] | 1320 | } |
---|
| 1321 | |
---|
[13deae88] | 1322 | void AlternativeFinder::Finder::postvisit( ConstantExpr *constantExpr ) { |
---|
[6d6e829] | 1323 | alternatives.push_back( Alternative{ constantExpr->clone(), env } ); |
---|
[a32b204] | 1324 | } |
---|
| 1325 | |
---|
[13deae88] | 1326 | void AlternativeFinder::Finder::postvisit( SizeofExpr *sizeofExpr ) { |
---|
[a32b204] | 1327 | if ( sizeofExpr->get_isType() ) { |
---|
[322b97e] | 1328 | Type * newType = sizeofExpr->get_type()->clone(); |
---|
[6d6e829] | 1329 | alternatives.push_back( Alternative{ |
---|
| 1330 | new SizeofExpr{ resolveTypeof( newType, indexer ) }, env } ); |
---|
[a32b204] | 1331 | } else { |
---|
| 1332 | // find all alternatives for the argument to sizeof |
---|
| 1333 | AlternativeFinder finder( indexer, env ); |
---|
| 1334 | finder.find( sizeofExpr->get_expr() ); |
---|
| 1335 | // find the lowest cost alternative among the alternatives, otherwise ambiguous |
---|
| 1336 | AltList winners; |
---|
| 1337 | findMinCost( finder.alternatives.begin(), finder.alternatives.end(), back_inserter( winners ) ); |
---|
| 1338 | if ( winners.size() != 1 ) { |
---|
[a16764a6] | 1339 | SemanticError( sizeofExpr->get_expr(), "Ambiguous expression in sizeof operand: " ); |
---|
[a32b204] | 1340 | } // if |
---|
| 1341 | // return the lowest cost alternative for the argument |
---|
| 1342 | Alternative &choice = winners.front(); |
---|
[a181494] | 1343 | referenceToRvalueConversion( choice.expr, choice.cost ); |
---|
[6d6e829] | 1344 | alternatives.push_back( Alternative{ |
---|
| 1345 | choice, new SizeofExpr( choice.expr->clone() ), Cost::zero } ); |
---|
[47534159] | 1346 | } // if |
---|
| 1347 | } |
---|
| 1348 | |
---|
[13deae88] | 1349 | void AlternativeFinder::Finder::postvisit( AlignofExpr *alignofExpr ) { |
---|
[47534159] | 1350 | if ( alignofExpr->get_isType() ) { |
---|
[322b97e] | 1351 | Type * newType = alignofExpr->get_type()->clone(); |
---|
[6d6e829] | 1352 | alternatives.push_back( Alternative{ |
---|
| 1353 | new AlignofExpr{ resolveTypeof( newType, indexer ) }, env } ); |
---|
[47534159] | 1354 | } else { |
---|
| 1355 | // find all alternatives for the argument to sizeof |
---|
| 1356 | AlternativeFinder finder( indexer, env ); |
---|
| 1357 | finder.find( alignofExpr->get_expr() ); |
---|
| 1358 | // find the lowest cost alternative among the alternatives, otherwise ambiguous |
---|
| 1359 | AltList winners; |
---|
| 1360 | findMinCost( finder.alternatives.begin(), finder.alternatives.end(), back_inserter( winners ) ); |
---|
| 1361 | if ( winners.size() != 1 ) { |
---|
[a16764a6] | 1362 | SemanticError( alignofExpr->get_expr(), "Ambiguous expression in alignof operand: " ); |
---|
[47534159] | 1363 | } // if |
---|
| 1364 | // return the lowest cost alternative for the argument |
---|
| 1365 | Alternative &choice = winners.front(); |
---|
[a181494] | 1366 | referenceToRvalueConversion( choice.expr, choice.cost ); |
---|
[6d6e829] | 1367 | alternatives.push_back( Alternative{ |
---|
| 1368 | choice, new AlignofExpr{ choice.expr->clone() }, Cost::zero } ); |
---|
[a32b204] | 1369 | } // if |
---|
| 1370 | } |
---|
| 1371 | |
---|
[2a4b088] | 1372 | template< typename StructOrUnionType > |
---|
[13deae88] | 1373 | void AlternativeFinder::Finder::addOffsetof( StructOrUnionType *aggInst, const std::string &name ) { |
---|
[2a4b088] | 1374 | std::list< Declaration* > members; |
---|
| 1375 | aggInst->lookup( name, members ); |
---|
| 1376 | for ( std::list< Declaration* >::const_iterator i = members.begin(); i != members.end(); ++i ) { |
---|
| 1377 | if ( DeclarationWithType *dwt = dynamic_cast< DeclarationWithType* >( *i ) ) { |
---|
[6d6e829] | 1378 | alternatives.push_back( Alternative{ |
---|
| 1379 | new OffsetofExpr{ aggInst->clone(), dwt }, env } ); |
---|
[2a4b088] | 1380 | renameTypes( alternatives.back().expr ); |
---|
| 1381 | } else { |
---|
| 1382 | assert( false ); |
---|
| 1383 | } |
---|
| 1384 | } |
---|
| 1385 | } |
---|
[6ed1d4b] | 1386 | |
---|
[13deae88] | 1387 | void AlternativeFinder::Finder::postvisit( UntypedOffsetofExpr *offsetofExpr ) { |
---|
[2a4b088] | 1388 | AlternativeFinder funcFinder( indexer, env ); |
---|
[85517ddb] | 1389 | // xxx - resolveTypeof? |
---|
[2a4b088] | 1390 | if ( StructInstType *structInst = dynamic_cast< StructInstType* >( offsetofExpr->get_type() ) ) { |
---|
[490ff5c3] | 1391 | addOffsetof( structInst, offsetofExpr->member ); |
---|
[2a4b088] | 1392 | } else if ( UnionInstType *unionInst = dynamic_cast< UnionInstType* >( offsetofExpr->get_type() ) ) { |
---|
[490ff5c3] | 1393 | addOffsetof( unionInst, offsetofExpr->member ); |
---|
[2a4b088] | 1394 | } |
---|
| 1395 | } |
---|
[6ed1d4b] | 1396 | |
---|
[13deae88] | 1397 | void AlternativeFinder::Finder::postvisit( OffsetofExpr *offsetofExpr ) { |
---|
[6d6e829] | 1398 | alternatives.push_back( Alternative{ offsetofExpr->clone(), env } ); |
---|
[afc1045] | 1399 | } |
---|
| 1400 | |
---|
[13deae88] | 1401 | void AlternativeFinder::Finder::postvisit( OffsetPackExpr *offsetPackExpr ) { |
---|
[6d6e829] | 1402 | alternatives.push_back( Alternative{ offsetPackExpr->clone(), env } ); |
---|
[25a054f] | 1403 | } |
---|
| 1404 | |
---|
[a40d503] | 1405 | namespace { |
---|
| 1406 | void resolveAttr( SymTab::Indexer::IdData data, FunctionType *function, Type *argType, const TypeEnvironment &env, AlternativeFinder & finder ) { |
---|
| 1407 | // assume no polymorphism |
---|
| 1408 | // assume no implicit conversions |
---|
| 1409 | assert( function->get_parameters().size() == 1 ); |
---|
| 1410 | PRINT( |
---|
| 1411 | std::cerr << "resolvAttr: funcDecl is "; |
---|
| 1412 | data.id->print( std::cerr ); |
---|
| 1413 | std::cerr << " argType is "; |
---|
| 1414 | argType->print( std::cerr ); |
---|
| 1415 | std::cerr << std::endl; |
---|
| 1416 | ) |
---|
| 1417 | const SymTab::Indexer & indexer = finder.get_indexer(); |
---|
| 1418 | AltList & alternatives = finder.get_alternatives(); |
---|
| 1419 | if ( typesCompatibleIgnoreQualifiers( argType, function->get_parameters().front()->get_type(), indexer, env ) ) { |
---|
[a181494] | 1420 | Cost cost = Cost::zero; |
---|
| 1421 | Expression * newExpr = data.combine( cost ); |
---|
[6d6e829] | 1422 | alternatives.push_back( Alternative{ |
---|
[2c187378] | 1423 | new AttrExpr{ newExpr, argType->clone() }, env, OpenVarSet{}, |
---|
| 1424 | AssertionList{}, Cost::zero, cost } ); |
---|
[a40d503] | 1425 | for ( DeclarationWithType * retVal : function->returnVals ) { |
---|
| 1426 | alternatives.back().expr->result = retVal->get_type()->clone(); |
---|
| 1427 | } // for |
---|
| 1428 | } // if |
---|
| 1429 | } |
---|
[a32b204] | 1430 | } |
---|
| 1431 | |
---|
[13deae88] | 1432 | void AlternativeFinder::Finder::postvisit( AttrExpr *attrExpr ) { |
---|
[a32b204] | 1433 | // assume no 'pointer-to-attribute' |
---|
| 1434 | NameExpr *nameExpr = dynamic_cast< NameExpr* >( attrExpr->get_attr() ); |
---|
| 1435 | assert( nameExpr ); |
---|
[a40d503] | 1436 | std::list< SymTab::Indexer::IdData > attrList; |
---|
[a32b204] | 1437 | indexer.lookupId( nameExpr->get_name(), attrList ); |
---|
| 1438 | if ( attrExpr->get_isType() || attrExpr->get_expr() ) { |
---|
[a40d503] | 1439 | for ( auto & data : attrList ) { |
---|
| 1440 | DeclarationWithType * id = data.id; |
---|
[a32b204] | 1441 | // check if the type is function |
---|
[a40d503] | 1442 | if ( FunctionType *function = dynamic_cast< FunctionType* >( id->get_type() ) ) { |
---|
[a32b204] | 1443 | // assume exactly one parameter |
---|
| 1444 | if ( function->get_parameters().size() == 1 ) { |
---|
| 1445 | if ( attrExpr->get_isType() ) { |
---|
[13deae88] | 1446 | resolveAttr( data, function, attrExpr->get_type(), env, altFinder); |
---|
[a32b204] | 1447 | } else { |
---|
| 1448 | AlternativeFinder finder( indexer, env ); |
---|
| 1449 | finder.find( attrExpr->get_expr() ); |
---|
| 1450 | for ( AltList::iterator choice = finder.alternatives.begin(); choice != finder.alternatives.end(); ++choice ) { |
---|
[906e24d] | 1451 | if ( choice->expr->get_result()->size() == 1 ) { |
---|
[13deae88] | 1452 | resolveAttr(data, function, choice->expr->get_result(), choice->env, altFinder ); |
---|
[a32b204] | 1453 | } // fi |
---|
| 1454 | } // for |
---|
| 1455 | } // if |
---|
| 1456 | } // if |
---|
| 1457 | } // if |
---|
| 1458 | } // for |
---|
| 1459 | } else { |
---|
[a40d503] | 1460 | for ( auto & data : attrList ) { |
---|
[a181494] | 1461 | Cost cost = Cost::zero; |
---|
| 1462 | Expression * newExpr = data.combine( cost ); |
---|
[6d6e829] | 1463 | alternatives.push_back( Alternative{ |
---|
| 1464 | newExpr, env, OpenVarSet{}, AssertionList{}, Cost::zero, cost } ); |
---|
[a32b204] | 1465 | renameTypes( alternatives.back().expr ); |
---|
| 1466 | } // for |
---|
| 1467 | } // if |
---|
| 1468 | } |
---|
| 1469 | |
---|
[13deae88] | 1470 | void AlternativeFinder::Finder::postvisit( LogicalExpr *logicalExpr ) { |
---|
[a32b204] | 1471 | AlternativeFinder firstFinder( indexer, env ); |
---|
| 1472 | firstFinder.findWithAdjustment( logicalExpr->get_arg1() ); |
---|
[fee651f] | 1473 | if ( firstFinder.alternatives.empty() ) return; |
---|
| 1474 | AlternativeFinder secondFinder( indexer, env ); |
---|
| 1475 | secondFinder.findWithAdjustment( logicalExpr->get_arg2() ); |
---|
| 1476 | if ( secondFinder.alternatives.empty() ) return; |
---|
[490ff5c3] | 1477 | for ( const Alternative & first : firstFinder.alternatives ) { |
---|
| 1478 | for ( const Alternative & second : secondFinder.alternatives ) { |
---|
[6d6e829] | 1479 | TypeEnvironment compositeEnv{ first.env }; |
---|
[490ff5c3] | 1480 | compositeEnv.simpleCombine( second.env ); |
---|
[6d6e829] | 1481 | OpenVarSet openVars{ first.openVars }; |
---|
| 1482 | mergeOpenVars( openVars, second.openVars ); |
---|
[2c187378] | 1483 | AssertionSet need; |
---|
| 1484 | cloneAll( first.need, need ); |
---|
| 1485 | cloneAll( second.need, need ); |
---|
[6d6e829] | 1486 | |
---|
| 1487 | LogicalExpr *newExpr = new LogicalExpr{ |
---|
| 1488 | first.expr->clone(), second.expr->clone(), logicalExpr->get_isAnd() }; |
---|
| 1489 | alternatives.push_back( Alternative{ |
---|
[2c187378] | 1490 | newExpr, std::move(compositeEnv), std::move(openVars), |
---|
| 1491 | AssertionList( need.begin(), need.end() ), first.cost + second.cost } ); |
---|
[d9a0e76] | 1492 | } |
---|
| 1493 | } |
---|
| 1494 | } |
---|
[51b7345] | 1495 | |
---|
[13deae88] | 1496 | void AlternativeFinder::Finder::postvisit( ConditionalExpr *conditionalExpr ) { |
---|
[32b8144] | 1497 | // find alternatives for condition |
---|
[a32b204] | 1498 | AlternativeFinder firstFinder( indexer, env ); |
---|
[624b722d] | 1499 | firstFinder.findWithAdjustment( conditionalExpr->arg1 ); |
---|
[ebcb7ba] | 1500 | if ( firstFinder.alternatives.empty() ) return; |
---|
| 1501 | // find alternatives for true expression |
---|
| 1502 | AlternativeFinder secondFinder( indexer, env ); |
---|
[624b722d] | 1503 | secondFinder.findWithAdjustment( conditionalExpr->arg2 ); |
---|
[ebcb7ba] | 1504 | if ( secondFinder.alternatives.empty() ) return; |
---|
| 1505 | // find alterantives for false expression |
---|
| 1506 | AlternativeFinder thirdFinder( indexer, env ); |
---|
[624b722d] | 1507 | thirdFinder.findWithAdjustment( conditionalExpr->arg3 ); |
---|
[ebcb7ba] | 1508 | if ( thirdFinder.alternatives.empty() ) return; |
---|
[624b722d] | 1509 | for ( const Alternative & first : firstFinder.alternatives ) { |
---|
| 1510 | for ( const Alternative & second : secondFinder.alternatives ) { |
---|
| 1511 | for ( const Alternative & third : thirdFinder.alternatives ) { |
---|
[6d6e829] | 1512 | TypeEnvironment compositeEnv{ first.env }; |
---|
[624b722d] | 1513 | compositeEnv.simpleCombine( second.env ); |
---|
| 1514 | compositeEnv.simpleCombine( third.env ); |
---|
[6d6e829] | 1515 | OpenVarSet openVars{ first.openVars }; |
---|
| 1516 | mergeOpenVars( openVars, second.openVars ); |
---|
| 1517 | mergeOpenVars( openVars, third.openVars ); |
---|
[2c187378] | 1518 | AssertionSet need; |
---|
| 1519 | cloneAll( first.need, need ); |
---|
| 1520 | cloneAll( second.need, need ); |
---|
| 1521 | cloneAll( third.need, need ); |
---|
| 1522 | AssertionSet have; |
---|
[6d6e829] | 1523 | |
---|
[32b8144] | 1524 | // unify true and false types, then infer parameters to produce new alternatives |
---|
[668e971a] | 1525 | Type* commonType = nullptr; |
---|
[6d6e829] | 1526 | if ( unify( second.expr->result, third.expr->result, compositeEnv, |
---|
[2c187378] | 1527 | need, have, openVars, indexer, commonType ) ) { |
---|
[6d6e829] | 1528 | ConditionalExpr *newExpr = new ConditionalExpr{ |
---|
| 1529 | first.expr->clone(), second.expr->clone(), third.expr->clone() }; |
---|
[624b722d] | 1530 | newExpr->result = commonType ? commonType : second.expr->result->clone(); |
---|
[ddf8a29] | 1531 | // convert both options to the conditional result type |
---|
[6d6e829] | 1532 | Cost cost = first.cost + second.cost + third.cost; |
---|
| 1533 | cost += computeExpressionConversionCost( |
---|
| 1534 | newExpr->arg2, newExpr->result, indexer, compositeEnv ); |
---|
| 1535 | cost += computeExpressionConversionCost( |
---|
| 1536 | newExpr->arg3, newExpr->result, indexer, compositeEnv ); |
---|
| 1537 | // output alternative |
---|
| 1538 | Alternative newAlt{ |
---|
[2c187378] | 1539 | newExpr, std::move(compositeEnv), std::move(openVars), |
---|
| 1540 | AssertionList( need.begin(), need.end() ), cost }; |
---|
[0b00df0] | 1541 | inferParameters( newAlt, back_inserter( alternatives ) ); |
---|
[a32b204] | 1542 | } // if |
---|
| 1543 | } // for |
---|
| 1544 | } // for |
---|
| 1545 | } // for |
---|
| 1546 | } |
---|
| 1547 | |
---|
[13deae88] | 1548 | void AlternativeFinder::Finder::postvisit( CommaExpr *commaExpr ) { |
---|
[a32b204] | 1549 | TypeEnvironment newEnv( env ); |
---|
| 1550 | Expression *newFirstArg = resolveInVoidContext( commaExpr->get_arg1(), indexer, newEnv ); |
---|
| 1551 | AlternativeFinder secondFinder( indexer, newEnv ); |
---|
| 1552 | secondFinder.findWithAdjustment( commaExpr->get_arg2() ); |
---|
[490ff5c3] | 1553 | for ( const Alternative & alt : secondFinder.alternatives ) { |
---|
[6d6e829] | 1554 | alternatives.push_back( Alternative{ |
---|
| 1555 | alt, new CommaExpr{ newFirstArg->clone(), alt.expr->clone() }, alt.cost } ); |
---|
[a32b204] | 1556 | } // for |
---|
| 1557 | delete newFirstArg; |
---|
| 1558 | } |
---|
| 1559 | |
---|
[13deae88] | 1560 | void AlternativeFinder::Finder::postvisit( RangeExpr * rangeExpr ) { |
---|
[32b8144] | 1561 | // resolve low and high, accept alternatives whose low and high types unify |
---|
| 1562 | AlternativeFinder firstFinder( indexer, env ); |
---|
[490ff5c3] | 1563 | firstFinder.findWithAdjustment( rangeExpr->low ); |
---|
[fee651f] | 1564 | if ( firstFinder.alternatives.empty() ) return; |
---|
| 1565 | AlternativeFinder secondFinder( indexer, env ); |
---|
[490ff5c3] | 1566 | secondFinder.findWithAdjustment( rangeExpr->high ); |
---|
[fee651f] | 1567 | if ( secondFinder.alternatives.empty() ) return; |
---|
[490ff5c3] | 1568 | for ( const Alternative & first : firstFinder.alternatives ) { |
---|
| 1569 | for ( const Alternative & second : secondFinder.alternatives ) { |
---|
[6d6e829] | 1570 | TypeEnvironment compositeEnv{ first.env }; |
---|
[490ff5c3] | 1571 | compositeEnv.simpleCombine( second.env ); |
---|
[6d6e829] | 1572 | OpenVarSet openVars{ first.openVars }; |
---|
| 1573 | mergeOpenVars( openVars, second.openVars ); |
---|
[2c187378] | 1574 | AssertionSet need; |
---|
| 1575 | cloneAll( first.need, need ); |
---|
| 1576 | cloneAll( second.need, need ); |
---|
| 1577 | AssertionSet have; |
---|
[6d6e829] | 1578 | |
---|
[32b8144] | 1579 | Type* commonType = nullptr; |
---|
[2c187378] | 1580 | if ( unify( first.expr->result, second.expr->result, compositeEnv, need, have, |
---|
| 1581 | openVars, indexer, commonType ) ) { |
---|
[6d6e829] | 1582 | RangeExpr * newExpr = |
---|
| 1583 | new RangeExpr{ first.expr->clone(), second.expr->clone() }; |
---|
[490ff5c3] | 1584 | newExpr->result = commonType ? commonType : first.expr->result->clone(); |
---|
[6d6e829] | 1585 | Alternative newAlt{ |
---|
[2c187378] | 1586 | newExpr, std::move(compositeEnv), std::move(openVars), |
---|
| 1587 | AssertionList( need.begin(), need.end() ), first.cost + second.cost }; |
---|
[0b00df0] | 1588 | inferParameters( newAlt, back_inserter( alternatives ) ); |
---|
[32b8144] | 1589 | } // if |
---|
| 1590 | } // for |
---|
| 1591 | } // for |
---|
| 1592 | } |
---|
| 1593 | |
---|
[13deae88] | 1594 | void AlternativeFinder::Finder::postvisit( UntypedTupleExpr *tupleExpr ) { |
---|
[bd4f2e9] | 1595 | std::vector< AlternativeFinder > subExprAlternatives; |
---|
[13deae88] | 1596 | altFinder.findSubExprs( tupleExpr->get_exprs().begin(), tupleExpr->get_exprs().end(), |
---|
[bd4f2e9] | 1597 | back_inserter( subExprAlternatives ) ); |
---|
| 1598 | std::vector< AltList > possibilities; |
---|
[452747a] | 1599 | combos( subExprAlternatives.begin(), subExprAlternatives.end(), |
---|
[bd4f2e9] | 1600 | back_inserter( possibilities ) ); |
---|
| 1601 | for ( const AltList& alts : possibilities ) { |
---|
[907eccb] | 1602 | std::list< Expression * > exprs; |
---|
[bd4f2e9] | 1603 | makeExprList( alts, exprs ); |
---|
[a32b204] | 1604 | |
---|
| 1605 | TypeEnvironment compositeEnv; |
---|
[6d6e829] | 1606 | OpenVarSet openVars; |
---|
| 1607 | AssertionSet need; |
---|
| 1608 | for ( const Alternative& alt : alts ) { |
---|
| 1609 | compositeEnv.simpleCombine( alt.env ); |
---|
| 1610 | mergeOpenVars( openVars, alt.openVars ); |
---|
[2c187378] | 1611 | cloneAll( alt.need, need ); |
---|
[6d6e829] | 1612 | } |
---|
| 1613 | |
---|
| 1614 | alternatives.push_back( Alternative{ |
---|
[2c187378] | 1615 | new TupleExpr{ exprs }, std::move(compositeEnv), std::move(openVars), |
---|
[6d6e829] | 1616 | AssertionList( need.begin(), need.end() ), sumCost( alts ) } ); |
---|
[a32b204] | 1617 | } // for |
---|
[d9a0e76] | 1618 | } |
---|
[dc2e7e0] | 1619 | |
---|
[13deae88] | 1620 | void AlternativeFinder::Finder::postvisit( TupleExpr *tupleExpr ) { |
---|
[6d6e829] | 1621 | alternatives.push_back( Alternative{ tupleExpr->clone(), env } ); |
---|
[907eccb] | 1622 | } |
---|
| 1623 | |
---|
[13deae88] | 1624 | void AlternativeFinder::Finder::postvisit( ImplicitCopyCtorExpr * impCpCtorExpr ) { |
---|
[6d6e829] | 1625 | alternatives.push_back( Alternative{ impCpCtorExpr->clone(), env } ); |
---|
[dc2e7e0] | 1626 | } |
---|
[b6fe7e6] | 1627 | |
---|
[13deae88] | 1628 | void AlternativeFinder::Finder::postvisit( ConstructorExpr * ctorExpr ) { |
---|
[b6fe7e6] | 1629 | AlternativeFinder finder( indexer, env ); |
---|
| 1630 | // don't prune here, since it's guaranteed all alternatives will have the same type |
---|
| 1631 | // (giving the alternatives different types is half of the point of ConstructorExpr nodes) |
---|
[4e66a18] | 1632 | finder.findWithoutPrune( ctorExpr->get_callExpr() ); |
---|
[b6fe7e6] | 1633 | for ( Alternative & alt : finder.alternatives ) { |
---|
[6d6e829] | 1634 | alternatives.push_back( Alternative{ |
---|
| 1635 | alt, new ConstructorExpr( alt.expr->clone() ), alt.cost } ); |
---|
[b6fe7e6] | 1636 | } |
---|
| 1637 | } |
---|
[8f7cea1] | 1638 | |
---|
[13deae88] | 1639 | void AlternativeFinder::Finder::postvisit( TupleIndexExpr *tupleExpr ) { |
---|
[6d6e829] | 1640 | alternatives.push_back( Alternative{ tupleExpr->clone(), env } ); |
---|
[8f7cea1] | 1641 | } |
---|
[aa8f9df] | 1642 | |
---|
[13deae88] | 1643 | void AlternativeFinder::Finder::postvisit( TupleAssignExpr *tupleAssignExpr ) { |
---|
[6d6e829] | 1644 | alternatives.push_back( Alternative{ tupleAssignExpr->clone(), env } ); |
---|
[aa8f9df] | 1645 | } |
---|
[bf32bb8] | 1646 | |
---|
[13deae88] | 1647 | void AlternativeFinder::Finder::postvisit( UniqueExpr *unqExpr ) { |
---|
[bf32bb8] | 1648 | AlternativeFinder finder( indexer, env ); |
---|
| 1649 | finder.findWithAdjustment( unqExpr->get_expr() ); |
---|
| 1650 | for ( Alternative & alt : finder.alternatives ) { |
---|
[141b786] | 1651 | // ensure that the id is passed on to the UniqueExpr alternative so that the expressions are "linked" |
---|
[77971f6] | 1652 | UniqueExpr * newUnqExpr = new UniqueExpr( alt.expr->clone(), unqExpr->get_id() ); |
---|
[6d6e829] | 1653 | alternatives.push_back( Alternative{ alt, newUnqExpr, alt.cost } ); |
---|
[bf32bb8] | 1654 | } |
---|
| 1655 | } |
---|
| 1656 | |
---|
[13deae88] | 1657 | void AlternativeFinder::Finder::postvisit( StmtExpr *stmtExpr ) { |
---|
[722617d] | 1658 | StmtExpr * newStmtExpr = stmtExpr->clone(); |
---|
| 1659 | ResolvExpr::resolveStmtExpr( newStmtExpr, indexer ); |
---|
| 1660 | // xxx - this env is almost certainly wrong, and needs to somehow contain the combined environments from all of the statements in the stmtExpr... |
---|
[6d6e829] | 1661 | alternatives.push_back( Alternative{ newStmtExpr, env } ); |
---|
[722617d] | 1662 | } |
---|
| 1663 | |
---|
[13deae88] | 1664 | void AlternativeFinder::Finder::postvisit( UntypedInitExpr *initExpr ) { |
---|
[62423350] | 1665 | // handle each option like a cast |
---|
[e4d829b] | 1666 | AltList candidates; |
---|
[13deae88] | 1667 | PRINT( |
---|
| 1668 | std::cerr << "untyped init expr: " << initExpr << std::endl; |
---|
| 1669 | ) |
---|
[e4d829b] | 1670 | // O(N^2) checks of d-types with e-types |
---|
[62423350] | 1671 | for ( InitAlternative & initAlt : initExpr->get_initAlts() ) { |
---|
[228099e] | 1672 | Type * toType = resolveTypeof( initAlt.type->clone(), indexer ); |
---|
[62423350] | 1673 | SymTab::validateType( toType, &indexer ); |
---|
| 1674 | adjustExprType( toType, env, indexer ); |
---|
| 1675 | // Ideally the call to findWithAdjustment could be moved out of the loop, but unfortunately it currently has to occur inside or else |
---|
| 1676 | // polymorphic return types are not properly bound to the initialization type, since return type variables are only open for the duration of resolving |
---|
| 1677 | // the UntypedExpr. This is only actually an issue in initialization contexts that allow more than one possible initialization type, but it is still suboptimal. |
---|
| 1678 | AlternativeFinder finder( indexer, env ); |
---|
| 1679 | finder.targetType = toType; |
---|
[3d2ae8d] | 1680 | finder.findWithAdjustment( initExpr->expr ); |
---|
[62423350] | 1681 | for ( Alternative & alt : finder.get_alternatives() ) { |
---|
| 1682 | TypeEnvironment newEnv( alt.env ); |
---|
[2c187378] | 1683 | AssertionSet need; |
---|
| 1684 | cloneAll( alt.need, need ); |
---|
| 1685 | AssertionSet have; |
---|
[6d6e829] | 1686 | OpenVarSet openVars( alt.openVars ); |
---|
| 1687 | // xxx - find things in env that don't have a "representative type" and claim |
---|
| 1688 | // those are open vars? |
---|
[13deae88] | 1689 | PRINT( |
---|
| 1690 | std::cerr << " @ " << toType << " " << initAlt.designation << std::endl; |
---|
[3d2ae8d] | 1691 | ) |
---|
[6d6e829] | 1692 | // It's possible that a cast can throw away some values in a multiply-valued |
---|
| 1693 | // expression. (An example is a cast-to-void, which casts from one value to |
---|
| 1694 | // zero.) Figure out the prefix of the subexpression results that are cast |
---|
| 1695 | // directly. The candidate is invalid if it has fewer results than there are |
---|
| 1696 | // types to cast to. |
---|
[3d2ae8d] | 1697 | int discardedValues = alt.expr->result->size() - toType->size(); |
---|
[e4d829b] | 1698 | if ( discardedValues < 0 ) continue; |
---|
[6d6e829] | 1699 | // xxx - may need to go into tuple types and extract relevant types and use |
---|
| 1700 | // unifyList. Note that currently, this does not allow casting a tuple to an |
---|
| 1701 | // atomic type (e.g. (int)([1, 2, 3])) |
---|
| 1702 | |
---|
[e4d829b] | 1703 | // unification run for side-effects |
---|
[2c187378] | 1704 | unify( toType, alt.expr->result, newEnv, need, have, openVars, indexer ); |
---|
[6d6e829] | 1705 | // xxx - do some inspecting on this line... why isn't result bound to initAlt.type? |
---|
[e4d829b] | 1706 | |
---|
[3d2ae8d] | 1707 | Cost thisCost = castCost( alt.expr->result, toType, indexer, newEnv ); |
---|
[e4d829b] | 1708 | if ( thisCost != Cost::infinity ) { |
---|
| 1709 | // count one safe conversion for each value that is thrown away |
---|
[89be1c68] | 1710 | thisCost.incSafe( discardedValues ); |
---|
[6d6e829] | 1711 | Alternative newAlt{ |
---|
| 1712 | new InitExpr{ |
---|
| 1713 | restructureCast( alt.expr->clone(), toType, true ), initAlt.designation->clone() }, |
---|
[2c187378] | 1714 | std::move(newEnv), std::move(openVars), |
---|
| 1715 | AssertionList( need.begin(), need.end() ), alt.cost, thisCost }; |
---|
[0b00df0] | 1716 | inferParameters( newAlt, back_inserter( candidates ) ); |
---|
[e4d829b] | 1717 | } |
---|
| 1718 | } |
---|
| 1719 | } |
---|
| 1720 | |
---|
| 1721 | // findMinCost selects the alternatives with the lowest "cost" members, but has the side effect of copying the |
---|
| 1722 | // cvtCost member to the cost member (since the old cost is now irrelevant). Thus, calling findMinCost twice |
---|
| 1723 | // selects first based on argument cost, then on conversion cost. |
---|
| 1724 | AltList minArgCost; |
---|
| 1725 | findMinCost( candidates.begin(), candidates.end(), std::back_inserter( minArgCost ) ); |
---|
| 1726 | findMinCost( minArgCost.begin(), minArgCost.end(), std::back_inserter( alternatives ) ); |
---|
| 1727 | } |
---|
[c71b256] | 1728 | |
---|
| 1729 | void AlternativeFinder::Finder::postvisit( InitExpr * ) { |
---|
| 1730 | assertf( false, "AlternativeFinder should never see a resolved InitExpr." ); |
---|
| 1731 | } |
---|
| 1732 | |
---|
| 1733 | void AlternativeFinder::Finder::postvisit( DeletedExpr * ) { |
---|
| 1734 | assertf( false, "AlternativeFinder should never see a DeletedExpr." ); |
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| 1735 | } |
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[d807ca28] | 1736 | |
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| 1737 | void AlternativeFinder::Finder::postvisit( GenericExpr * ) { |
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| 1738 | assertf( false, "_Generic is not yet supported." ); |
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| 1739 | } |
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[51b7345] | 1740 | } // namespace ResolvExpr |
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[a32b204] | 1741 | |
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| 1742 | // Local Variables: // |
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| 1743 | // tab-width: 4 // |
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| 1744 | // mode: c++ // |
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| 1745 | // compile-command: "make install" // |
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| 1746 | // End: // |
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