[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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[41a2620] | 7 | // Unify.cc -- |
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[a32b204] | 8 | // |
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| 9 | // Author : Richard C. Bilson |
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| 10 | // Created On : Sun May 17 12:27:10 2015 |
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[4040425] | 11 | // Last Modified By : Peter A. Buhr |
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[6f95000] | 12 | // Last Modified On : Thu Mar 16 16:22:54 2017 |
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| 13 | // Update Count : 42 |
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[a32b204] | 14 | // |
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[51b7345] | 15 | |
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[ea6332d] | 16 | #include <cassert> // for assertf, assert |
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| 17 | #include <iterator> // for back_insert_iterator, back_inserter |
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| 18 | #include <map> // for _Rb_tree_const_iterator, _Rb_tree_i... |
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| 19 | #include <set> // for set |
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| 20 | #include <string> // for string, operator==, operator!=, bas... |
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[8e18b8e] | 21 | #include <utility> // for pair, move |
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[51b7345] | 22 | |
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[3096ec1] | 23 | #include "Common/PassVisitor.h" // for PassVisitor |
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[ea6332d] | 24 | #include "FindOpenVars.h" // for findOpenVars |
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| 25 | #include "Parser/LinkageSpec.h" // for C |
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| 26 | #include "SynTree/Constant.h" // for Constant |
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| 27 | #include "SynTree/Declaration.h" // for TypeDecl, TypeDecl::Data, Declarati... |
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| 28 | #include "SynTree/Expression.h" // for TypeExpr, Expression, ConstantExpr |
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| 29 | #include "SynTree/Mutator.h" // for Mutator |
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| 30 | #include "SynTree/Type.h" // for Type, TypeInstType, FunctionType |
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| 31 | #include "SynTree/Visitor.h" // for Visitor |
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| 32 | #include "Tuples/Tuples.h" // for isTtype |
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| 33 | #include "TypeEnvironment.h" // for EqvClass, AssertionSet, OpenVarSet |
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[51b7345] | 34 | #include "Unify.h" |
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[ea6332d] | 35 | #include "typeops.h" // for flatten, occurs, commonType |
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| 36 | |
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| 37 | namespace SymTab { |
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| 38 | class Indexer; |
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| 39 | } // namespace SymTab |
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[51b7345] | 40 | |
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[1cbca6e] | 41 | // #define DEBUG |
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[51b7345] | 42 | |
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| 43 | namespace ResolvExpr { |
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| 44 | |
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[36a2367] | 45 | struct Unify : public WithShortCircuiting { |
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[a32b204] | 46 | Unify( Type *type2, TypeEnvironment &env, AssertionSet &needAssertions, AssertionSet &haveAssertions, const OpenVarSet &openVars, WidenMode widenMode, const SymTab::Indexer &indexer ); |
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[41a2620] | 47 | |
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[a32b204] | 48 | bool get_result() const { return result; } |
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| 49 | |
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[36a2367] | 50 | void previsit( BaseSyntaxNode * ) { visit_children = false; } |
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| 51 | |
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| 52 | void postvisit( VoidType * voidType ); |
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| 53 | void postvisit( BasicType * basicType ); |
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| 54 | void postvisit( PointerType * pointerType ); |
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| 55 | void postvisit( ArrayType * arrayType ); |
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| 56 | void postvisit( ReferenceType * refType ); |
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| 57 | void postvisit( FunctionType * functionType ); |
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| 58 | void postvisit( StructInstType * aggregateUseType ); |
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| 59 | void postvisit( UnionInstType * aggregateUseType ); |
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| 60 | void postvisit( EnumInstType * aggregateUseType ); |
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| 61 | void postvisit( TraitInstType * aggregateUseType ); |
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| 62 | void postvisit( TypeInstType * aggregateUseType ); |
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| 63 | void postvisit( TupleType * tupleType ); |
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| 64 | void postvisit( VarArgsType * varArgsType ); |
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| 65 | void postvisit( ZeroType * zeroType ); |
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| 66 | void postvisit( OneType * oneType ); |
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| 67 | |
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| 68 | private: |
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[a32b204] | 69 | template< typename RefType > void handleRefType( RefType *inst, Type *other ); |
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[02ec390] | 70 | template< typename RefType > void handleGenericRefType( RefType *inst, Type *other ); |
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[a32b204] | 71 | |
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| 72 | bool result; |
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| 73 | Type *type2; // inherited |
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| 74 | TypeEnvironment &env; |
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| 75 | AssertionSet &needAssertions; |
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| 76 | AssertionSet &haveAssertions; |
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| 77 | const OpenVarSet &openVars; |
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| 78 | WidenMode widenMode; |
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| 79 | const SymTab::Indexer &indexer; |
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| 80 | }; |
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| 81 | |
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[eb50842] | 82 | /// Attempts an inexact unification of type1 and type2. |
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| 83 | /// Returns false if no such unification; if the types can be unified, sets common (unless they unify exactly and have identical type qualifiers) |
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[a32b204] | 84 | bool unifyInexact( Type *type1, Type *type2, TypeEnvironment &env, AssertionSet &needAssertions, AssertionSet &haveAssertions, const OpenVarSet &openVars, WidenMode widenMode, const SymTab::Indexer &indexer, Type *&common ); |
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| 85 | bool unifyExact( Type *type1, Type *type2, TypeEnvironment &env, AssertionSet &needAssertions, AssertionSet &haveAssertions, const OpenVarSet &openVars, WidenMode widenMode, const SymTab::Indexer &indexer ); |
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[41a2620] | 86 | |
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[a32b204] | 87 | bool typesCompatible( Type *first, Type *second, const SymTab::Indexer &indexer, const TypeEnvironment &env ) { |
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| 88 | TypeEnvironment newEnv; |
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[1cbca6e] | 89 | OpenVarSet openVars, closedVars; // added closedVars |
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[a32b204] | 90 | AssertionSet needAssertions, haveAssertions; |
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| 91 | Type *newFirst = first->clone(), *newSecond = second->clone(); |
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| 92 | env.apply( newFirst ); |
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| 93 | env.apply( newSecond ); |
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[1cbca6e] | 94 | |
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| 95 | // do we need to do this? Seems like we do, types should be able to be compatible if they |
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| 96 | // have free variables that can unify |
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| 97 | findOpenVars( newFirst, openVars, closedVars, needAssertions, haveAssertions, false ); |
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| 98 | findOpenVars( newSecond, openVars, closedVars, needAssertions, haveAssertions, true ); |
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| 99 | |
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[68f9c43] | 100 | return unifyExact( newFirst, newSecond, newEnv, needAssertions, haveAssertions, openVars, WidenMode( false, false ), indexer ); |
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[a32b204] | 101 | } |
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| 102 | |
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| 103 | bool typesCompatibleIgnoreQualifiers( Type *first, Type *second, const SymTab::Indexer &indexer, const TypeEnvironment &env ) { |
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| 104 | TypeEnvironment newEnv; |
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| 105 | OpenVarSet openVars; |
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| 106 | AssertionSet needAssertions, haveAssertions; |
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| 107 | Type *newFirst = first->clone(), *newSecond = second->clone(); |
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| 108 | env.apply( newFirst ); |
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| 109 | env.apply( newSecond ); |
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| 110 | newFirst->get_qualifiers() = Type::Qualifiers(); |
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| 111 | newSecond->get_qualifiers() = Type::Qualifiers(); |
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[2c57025] | 112 | /// std::cerr << "first is "; |
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| 113 | /// first->print( std::cerr ); |
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| 114 | /// std::cerr << std::endl << "second is "; |
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| 115 | /// second->print( std::cerr ); |
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| 116 | /// std::cerr << std::endl << "newFirst is "; |
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| 117 | /// newFirst->print( std::cerr ); |
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| 118 | /// std::cerr << std::endl << "newSecond is "; |
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| 119 | /// newSecond->print( std::cerr ); |
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| 120 | /// std::cerr << std::endl; |
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[68f9c43] | 121 | return unifyExact( newFirst, newSecond, newEnv, needAssertions, haveAssertions, openVars, WidenMode( false, false ), indexer ); |
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[a32b204] | 122 | } |
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| 123 | |
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[d7dc824] | 124 | bool isFtype( Type *type ) { |
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[a32b204] | 125 | if ( dynamic_cast< FunctionType* >( type ) ) { |
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| 126 | return true; |
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| 127 | } else if ( TypeInstType *typeInst = dynamic_cast< TypeInstType* >( type ) ) { |
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| 128 | return typeInst->get_isFtype(); |
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| 129 | } // if |
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| 130 | return false; |
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| 131 | } |
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| 132 | |
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[d7dc824] | 133 | bool tyVarCompatible( const TypeDecl::Data & data, Type *type ) { |
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[2c57025] | 134 | switch ( data.kind ) { |
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[a32b204] | 135 | case TypeDecl::Dtype: |
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[2c57025] | 136 | // to bind to an object type variable, the type must not be a function type. |
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| 137 | // if the type variable is specified to be a complete type then the incoming |
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| 138 | // type must also be complete |
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[6c3a988f] | 139 | // xxx - should this also check that type is not a tuple type and that it's not a ttype? |
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[d7dc824] | 140 | return ! isFtype( type ) && (! data.isComplete || type->isComplete() ); |
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[a32b204] | 141 | case TypeDecl::Ftype: |
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[d7dc824] | 142 | return isFtype( type ); |
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[b2daebd4] | 143 | case TypeDecl::Ttype: |
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[6c3a988f] | 144 | // ttype unifies with any tuple type |
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[f3b0a07] | 145 | return dynamic_cast< TupleType * >( type ) || Tuples::isTtype( type ); |
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[a32b204] | 146 | } // switch |
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| 147 | return false; |
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| 148 | } |
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| 149 | |
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[2c57025] | 150 | bool bindVar( TypeInstType *typeInst, Type *other, const TypeDecl::Data & data, TypeEnvironment &env, AssertionSet &needAssertions, AssertionSet &haveAssertions, const OpenVarSet &openVars, WidenMode widenMode, const SymTab::Indexer &indexer ) { |
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[36a5a77] | 151 | // remove references from other, so that type variables can only bind to value types |
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| 152 | other = other->stripReferences(); |
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[a32b204] | 153 | OpenVarSet::const_iterator tyvar = openVars.find( typeInst->get_name() ); |
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| 154 | assert( tyvar != openVars.end() ); |
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[d7dc824] | 155 | if ( ! tyVarCompatible( tyvar->second, other ) ) { |
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[a32b204] | 156 | return false; |
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| 157 | } // if |
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| 158 | if ( occurs( other, typeInst->get_name(), env ) ) { |
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| 159 | return false; |
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| 160 | } // if |
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[8e18b8e] | 161 | if ( const EqvClass *curClass = env.lookup( typeInst->get_name() ) ) { |
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| 162 | if ( curClass->type ) { |
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[a32b204] | 163 | Type *common = 0; |
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[eb50842] | 164 | // attempt to unify equivalence class type (which has qualifiers stripped, so they must be restored) with the type to bind to |
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[8e18b8e] | 165 | Type* newType = curClass->type->clone(); |
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[721f17a] | 166 | newType->get_qualifiers() = typeInst->get_qualifiers(); |
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[8e18b8e] | 167 | if ( unifyInexact( newType, other, env, needAssertions, haveAssertions, openVars, widenMode & WidenMode( curClass->allowWidening, true ), indexer, common ) ) { |
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[a32b204] | 168 | if ( common ) { |
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| 169 | common->get_qualifiers() = Type::Qualifiers(); |
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[8e18b8e] | 170 | EqvClass newClass = *curClass; |
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| 171 | newClass.type = common; |
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| 172 | env.add( std::move(newClass) ); |
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[a32b204] | 173 | } // if |
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| 174 | return true; |
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| 175 | } else { |
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| 176 | return false; |
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| 177 | } // if |
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| 178 | } else { |
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[8e18b8e] | 179 | EqvClass newClass = *curClass; |
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| 180 | newClass.type = other->clone(); |
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| 181 | newClass.type->get_qualifiers() = Type::Qualifiers(); |
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| 182 | newClass.allowWidening = widenMode.widenFirst && widenMode.widenSecond; |
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| 183 | env.add( std::move(newClass) ); |
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[a32b204] | 184 | } // if |
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| 185 | } else { |
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| 186 | EqvClass newClass; |
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| 187 | newClass.vars.insert( typeInst->get_name() ); |
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| 188 | newClass.type = other->clone(); |
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| 189 | newClass.type->get_qualifiers() = Type::Qualifiers(); |
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| 190 | newClass.allowWidening = widenMode.widenFirst && widenMode.widenSecond; |
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[2c57025] | 191 | newClass.data = data; |
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[a32b204] | 192 | env.add( newClass ); |
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| 193 | } // if |
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| 194 | return true; |
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| 195 | } |
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| 196 | |
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[2c57025] | 197 | bool bindVarToVar( TypeInstType *var1, TypeInstType *var2, const TypeDecl::Data & data, TypeEnvironment &env, AssertionSet &needAssertions, AssertionSet &haveAssertions, const OpenVarSet &openVars, WidenMode widenMode, const SymTab::Indexer &indexer ) { |
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[a32b204] | 198 | bool result = true; |
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[8e18b8e] | 199 | const EqvClass *class1 = env.lookup( var1->get_name() ); |
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| 200 | const EqvClass *class2 = env.lookup( var2->get_name() ); |
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[a32b204] | 201 | bool widen1 = false, widen2 = false; |
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[8e18b8e] | 202 | Type *type1 = nullptr, *type2 = nullptr; |
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[41a2620] | 203 | |
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[8e18b8e] | 204 | if ( class1 ) { |
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| 205 | if ( class1->type ) { |
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| 206 | if ( occurs( class1->type, var2->get_name(), env ) ) { |
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[a32b204] | 207 | return false; |
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| 208 | } // if |
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[8e18b8e] | 209 | type1 = class1->type->clone(); |
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[a32b204] | 210 | } // if |
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[8e18b8e] | 211 | widen1 = widenMode.widenFirst && class1->allowWidening; |
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[a32b204] | 212 | } // if |
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[8e18b8e] | 213 | if ( class2 ) { |
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| 214 | if ( class2->type ) { |
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| 215 | if ( occurs( class2->type, var1->get_name(), env ) ) { |
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[a32b204] | 216 | return false; |
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| 217 | } // if |
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[8e18b8e] | 218 | type2 = class2->type->clone(); |
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[a32b204] | 219 | } // if |
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[8e18b8e] | 220 | widen2 = widenMode.widenSecond && class2->allowWidening; |
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[a32b204] | 221 | } // if |
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[41a2620] | 222 | |
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[a32b204] | 223 | if ( type1 && type2 ) { |
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[2c57025] | 224 | // std::cerr << "has type1 && type2" << std::endl; |
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[a32b204] | 225 | WidenMode newWidenMode ( widen1, widen2 ); |
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| 226 | Type *common = 0; |
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| 227 | if ( unifyInexact( type1, type2, env, needAssertions, haveAssertions, openVars, newWidenMode, indexer, common ) ) { |
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[8e18b8e] | 228 | EqvClass newClass1 = *class1; |
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| 229 | newClass1.vars.insert( class2->vars.begin(), class2->vars.end() ); |
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| 230 | newClass1.allowWidening = widen1 && widen2; |
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[a32b204] | 231 | if ( common ) { |
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| 232 | common->get_qualifiers() = Type::Qualifiers(); |
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[8e18b8e] | 233 | newClass1.type = common; |
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[a32b204] | 234 | } // if |
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[8e18b8e] | 235 | env.add( std::move(newClass1) ); |
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[a32b204] | 236 | } else { |
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| 237 | result = false; |
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| 238 | } // if |
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[8e18b8e] | 239 | } else if ( class1 && class2 ) { |
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[a32b204] | 240 | if ( type1 ) { |
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[8e18b8e] | 241 | EqvClass newClass1 = *class1; |
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| 242 | newClass1.vars.insert( class2->vars.begin(), class2->vars.end() ); |
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| 243 | newClass1.allowWidening = widen1; |
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| 244 | env.add( std::move(newClass1) ); |
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[a32b204] | 245 | } else { |
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[8e18b8e] | 246 | EqvClass newClass2 = *class2; |
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| 247 | newClass2.vars.insert( class1->vars.begin(), class1->vars.end() ); |
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| 248 | newClass2.allowWidening = widen2; |
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| 249 | env.add( std::move(newClass2) ); |
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[a32b204] | 250 | } // if |
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[8e18b8e] | 251 | } else if ( class1 ) { |
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| 252 | EqvClass newClass1 = *class1; |
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| 253 | newClass1.vars.insert( var2->get_name() ); |
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| 254 | newClass1.allowWidening = widen1; |
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| 255 | env.add( std::move(newClass1) ); |
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| 256 | } else if ( class2 ) { |
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| 257 | EqvClass newClass2 = *class2; |
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| 258 | newClass2.vars.insert( var1->get_name() ); |
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| 259 | newClass2.allowWidening = widen2; |
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| 260 | env.add( std::move(newClass2) ); |
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[a32b204] | 261 | } else { |
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| 262 | EqvClass newClass; |
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| 263 | newClass.vars.insert( var1->get_name() ); |
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| 264 | newClass.vars.insert( var2->get_name() ); |
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| 265 | newClass.allowWidening = widen1 && widen2; |
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[2c57025] | 266 | newClass.data = data; |
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[a32b204] | 267 | env.add( newClass ); |
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| 268 | } // if |
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| 269 | return result; |
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| 270 | } |
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| 271 | |
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| 272 | bool unify( Type *type1, Type *type2, TypeEnvironment &env, AssertionSet &needAssertions, AssertionSet &haveAssertions, OpenVarSet &openVars, const SymTab::Indexer &indexer ) { |
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| 273 | OpenVarSet closedVars; |
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| 274 | findOpenVars( type1, openVars, closedVars, needAssertions, haveAssertions, false ); |
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| 275 | findOpenVars( type2, openVars, closedVars, needAssertions, haveAssertions, true ); |
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| 276 | Type *commonType = 0; |
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[68f9c43] | 277 | return unifyInexact( type1, type2, env, needAssertions, haveAssertions, openVars, WidenMode( true, true ), indexer, commonType ); |
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[a32b204] | 278 | } |
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| 279 | |
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| 280 | bool unify( Type *type1, Type *type2, TypeEnvironment &env, AssertionSet &needAssertions, AssertionSet &haveAssertions, OpenVarSet &openVars, const SymTab::Indexer &indexer, Type *&commonType ) { |
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| 281 | OpenVarSet closedVars; |
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| 282 | findOpenVars( type1, openVars, closedVars, needAssertions, haveAssertions, false ); |
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| 283 | findOpenVars( type2, openVars, closedVars, needAssertions, haveAssertions, true ); |
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| 284 | return unifyInexact( type1, type2, env, needAssertions, haveAssertions, openVars, WidenMode( true, true ), indexer, commonType ); |
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| 285 | } |
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| 286 | |
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| 287 | bool unifyExact( Type *type1, Type *type2, TypeEnvironment &env, AssertionSet &needAssertions, AssertionSet &haveAssertions, const OpenVarSet &openVars, WidenMode widenMode, const SymTab::Indexer &indexer ) { |
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[51b7345] | 288 | #ifdef DEBUG |
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[a32b204] | 289 | TypeEnvironment debugEnv( env ); |
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[51b7345] | 290 | #endif |
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[eb50842] | 291 | if ( type1->get_qualifiers() != type2->get_qualifiers() ) { |
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| 292 | return false; |
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| 293 | } |
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| 294 | |
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[a32b204] | 295 | bool result; |
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| 296 | TypeInstType *var1 = dynamic_cast< TypeInstType* >( type1 ); |
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| 297 | TypeInstType *var2 = dynamic_cast< TypeInstType* >( type2 ); |
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| 298 | OpenVarSet::const_iterator entry1, entry2; |
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| 299 | if ( var1 ) { |
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| 300 | entry1 = openVars.find( var1->get_name() ); |
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| 301 | } // if |
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| 302 | if ( var2 ) { |
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| 303 | entry2 = openVars.find( var2->get_name() ); |
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| 304 | } // if |
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| 305 | bool isopen1 = var1 && ( entry1 != openVars.end() ); |
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| 306 | bool isopen2 = var2 && ( entry2 != openVars.end() ); |
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[eb50842] | 307 | |
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| 308 | if ( isopen1 && isopen2 && entry1->second == entry2->second ) { |
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[a32b204] | 309 | result = bindVarToVar( var1, var2, entry1->second, env, needAssertions, haveAssertions, openVars, widenMode, indexer ); |
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| 310 | } else if ( isopen1 ) { |
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| 311 | result = bindVar( var1, type2, entry1->second, env, needAssertions, haveAssertions, openVars, widenMode, indexer ); |
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[0873d22e] | 312 | } else if ( isopen2 ) { // TODO: swap widenMode values in call, since type positions are flipped? |
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[a32b204] | 313 | result = bindVar( var2, type1, entry2->second, env, needAssertions, haveAssertions, openVars, widenMode, indexer ); |
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| 314 | } else { |
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[36a2367] | 315 | PassVisitor<Unify> comparator( type2, env, needAssertions, haveAssertions, openVars, widenMode, indexer ); |
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[a32b204] | 316 | type1->accept( comparator ); |
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[36a2367] | 317 | result = comparator.pass.get_result(); |
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[a32b204] | 318 | } // if |
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[51b7345] | 319 | #ifdef DEBUG |
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[2c57025] | 320 | std::cerr << "============ unifyExact" << std::endl; |
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| 321 | std::cerr << "type1 is "; |
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| 322 | type1->print( std::cerr ); |
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| 323 | std::cerr << std::endl << "type2 is "; |
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| 324 | type2->print( std::cerr ); |
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| 325 | std::cerr << std::endl << "openVars are "; |
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| 326 | printOpenVarSet( openVars, std::cerr, 8 ); |
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| 327 | std::cerr << std::endl << "input env is " << std::endl; |
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| 328 | debugEnv.print( std::cerr, 8 ); |
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| 329 | std::cerr << std::endl << "result env is " << std::endl; |
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| 330 | env.print( std::cerr, 8 ); |
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| 331 | std::cerr << "result is " << result << std::endl; |
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[51b7345] | 332 | #endif |
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[a32b204] | 333 | return result; |
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| 334 | } |
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| 335 | |
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| 336 | bool unifyExact( Type *type1, Type *type2, TypeEnvironment &env, AssertionSet &needAssertions, AssertionSet &haveAssertions, OpenVarSet &openVars, const SymTab::Indexer &indexer ) { |
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| 337 | return unifyExact( type1, type2, env, needAssertions, haveAssertions, openVars, WidenMode( false, false ), indexer ); |
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| 338 | } |
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| 339 | |
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| 340 | bool unifyInexact( Type *type1, Type *type2, TypeEnvironment &env, AssertionSet &needAssertions, AssertionSet &haveAssertions, const OpenVarSet &openVars, WidenMode widenMode, const SymTab::Indexer &indexer, Type *&common ) { |
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| 341 | Type::Qualifiers tq1 = type1->get_qualifiers(), tq2 = type2->get_qualifiers(); |
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| 342 | type1->get_qualifiers() = Type::Qualifiers(); |
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| 343 | type2->get_qualifiers() = Type::Qualifiers(); |
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| 344 | bool result; |
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[51b7345] | 345 | #ifdef DEBUG |
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[2c57025] | 346 | std::cerr << "unifyInexact type 1 is "; |
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| 347 | type1->print( std::cerr ); |
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[0b150ec] | 348 | std::cerr << " type 2 is "; |
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[2c57025] | 349 | type2->print( std::cerr ); |
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| 350 | std::cerr << std::endl; |
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[51b7345] | 351 | #endif |
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[a32b204] | 352 | if ( ! unifyExact( type1, type2, env, needAssertions, haveAssertions, openVars, widenMode, indexer ) ) { |
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[51b7345] | 353 | #ifdef DEBUG |
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[2c57025] | 354 | std::cerr << "unifyInexact: no exact unification found" << std::endl; |
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[51b7345] | 355 | #endif |
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[a32b204] | 356 | if ( ( common = commonType( type1, type2, widenMode.widenFirst, widenMode.widenSecond, indexer, env, openVars ) ) ) { |
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[6f95000] | 357 | common->get_qualifiers() = tq1 | tq2; |
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[51b7345] | 358 | #ifdef DEBUG |
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[2c57025] | 359 | std::cerr << "unifyInexact: common type is "; |
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| 360 | common->print( std::cerr ); |
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| 361 | std::cerr << std::endl; |
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[51b7345] | 362 | #endif |
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[a32b204] | 363 | result = true; |
---|
| 364 | } else { |
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[51b7345] | 365 | #ifdef DEBUG |
---|
[2c57025] | 366 | std::cerr << "unifyInexact: no common type found" << std::endl; |
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[51b7345] | 367 | #endif |
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[a32b204] | 368 | result = false; |
---|
| 369 | } // if |
---|
| 370 | } else { |
---|
| 371 | if ( tq1 != tq2 ) { |
---|
| 372 | if ( ( tq1 > tq2 || widenMode.widenFirst ) && ( tq2 > tq1 || widenMode.widenSecond ) ) { |
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| 373 | common = type1->clone(); |
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[6f95000] | 374 | common->get_qualifiers() = tq1 | tq2; |
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[a32b204] | 375 | result = true; |
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| 376 | } else { |
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| 377 | result = false; |
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| 378 | } // if |
---|
| 379 | } else { |
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[e6cee92] | 380 | common = type1->clone(); |
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| 381 | common->get_qualifiers() = tq1 | tq2; |
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[a32b204] | 382 | result = true; |
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| 383 | } // if |
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| 384 | } // if |
---|
| 385 | type1->get_qualifiers() = tq1; |
---|
| 386 | type2->get_qualifiers() = tq2; |
---|
| 387 | return result; |
---|
| 388 | } |
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| 389 | |
---|
| 390 | Unify::Unify( Type *type2, TypeEnvironment &env, AssertionSet &needAssertions, AssertionSet &haveAssertions, const OpenVarSet &openVars, WidenMode widenMode, const SymTab::Indexer &indexer ) |
---|
| 391 | : result( false ), type2( type2 ), env( env ), needAssertions( needAssertions ), haveAssertions( haveAssertions ), openVars( openVars ), widenMode( widenMode ), indexer( indexer ) { |
---|
| 392 | } |
---|
| 393 | |
---|
[36a2367] | 394 | void Unify::postvisit( __attribute__((unused)) VoidType *voidType) { |
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[a32b204] | 395 | result = dynamic_cast< VoidType* >( type2 ); |
---|
| 396 | } |
---|
| 397 | |
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[36a2367] | 398 | void Unify::postvisit(BasicType *basicType) { |
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[a32b204] | 399 | if ( BasicType *otherBasic = dynamic_cast< BasicType* >( type2 ) ) { |
---|
| 400 | result = basicType->get_kind() == otherBasic->get_kind(); |
---|
| 401 | } // if |
---|
| 402 | } |
---|
| 403 | |
---|
| 404 | void markAssertionSet( AssertionSet &assertions, DeclarationWithType *assert ) { |
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[2c57025] | 405 | /// std::cerr << "assertion set is" << std::endl; |
---|
| 406 | /// printAssertionSet( assertions, std::cerr, 8 ); |
---|
| 407 | /// std::cerr << "looking for "; |
---|
| 408 | /// assert->print( std::cerr ); |
---|
| 409 | /// std::cerr << std::endl; |
---|
[a32b204] | 410 | AssertionSet::iterator i = assertions.find( assert ); |
---|
| 411 | if ( i != assertions.end() ) { |
---|
[2c57025] | 412 | /// std::cerr << "found it!" << std::endl; |
---|
[6c3a988f] | 413 | i->second.isUsed = true; |
---|
[a32b204] | 414 | } // if |
---|
| 415 | } |
---|
| 416 | |
---|
| 417 | void markAssertions( AssertionSet &assertion1, AssertionSet &assertion2, Type *type ) { |
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[aefcc3b] | 418 | for ( std::list< TypeDecl* >::const_iterator tyvar = type->get_forall().begin(); tyvar != type->get_forall().end(); ++tyvar ) { |
---|
[a32b204] | 419 | for ( std::list< DeclarationWithType* >::const_iterator assert = (*tyvar)->get_assertions().begin(); assert != (*tyvar)->get_assertions().end(); ++assert ) { |
---|
| 420 | markAssertionSet( assertion1, *assert ); |
---|
| 421 | markAssertionSet( assertion2, *assert ); |
---|
| 422 | } // for |
---|
| 423 | } // for |
---|
| 424 | } |
---|
| 425 | |
---|
[36a2367] | 426 | void Unify::postvisit(PointerType *pointerType) { |
---|
[a32b204] | 427 | if ( PointerType *otherPointer = dynamic_cast< PointerType* >( type2 ) ) { |
---|
| 428 | result = unifyExact( pointerType->get_base(), otherPointer->get_base(), env, needAssertions, haveAssertions, openVars, WidenMode( false, false ), indexer ); |
---|
| 429 | markAssertions( haveAssertions, needAssertions, pointerType ); |
---|
| 430 | markAssertions( haveAssertions, needAssertions, otherPointer ); |
---|
| 431 | } // if |
---|
| 432 | } |
---|
| 433 | |
---|
[36a2367] | 434 | void Unify::postvisit(ReferenceType *refType) { |
---|
[ce8c12f] | 435 | if ( ReferenceType *otherRef = dynamic_cast< ReferenceType* >( type2 ) ) { |
---|
| 436 | result = unifyExact( refType->get_base(), otherRef->get_base(), env, needAssertions, haveAssertions, openVars, WidenMode( false, false ), indexer ); |
---|
| 437 | markAssertions( haveAssertions, needAssertions, refType ); |
---|
| 438 | markAssertions( haveAssertions, needAssertions, otherRef ); |
---|
| 439 | } // if |
---|
| 440 | } |
---|
| 441 | |
---|
[36a2367] | 442 | void Unify::postvisit(ArrayType *arrayType) { |
---|
[a32b204] | 443 | ArrayType *otherArray = dynamic_cast< ArrayType* >( type2 ); |
---|
[1cbca6e] | 444 | // to unify, array types must both be VLA or both not VLA |
---|
| 445 | // and must both have a dimension expression or not have a dimension |
---|
[41a2620] | 446 | if ( otherArray && arrayType->get_isVarLen() == otherArray->get_isVarLen() ) { |
---|
[1cbca6e] | 447 | |
---|
| 448 | if ( ! arrayType->get_isVarLen() && ! otherArray->get_isVarLen() && |
---|
| 449 | arrayType->get_dimension() != 0 && otherArray->get_dimension() != 0 ) { |
---|
| 450 | ConstantExpr * ce1 = dynamic_cast< ConstantExpr * >( arrayType->get_dimension() ); |
---|
| 451 | ConstantExpr * ce2 = dynamic_cast< ConstantExpr * >( otherArray->get_dimension() ); |
---|
[41a2620] | 452 | // see C11 Reference Manual 6.7.6.2.6 |
---|
| 453 | // two array types with size specifiers that are integer constant expressions are |
---|
| 454 | // compatible if both size specifiers have the same constant value |
---|
| 455 | if ( ce1 && ce2 ) { |
---|
| 456 | Constant * c1 = ce1->get_constant(); |
---|
| 457 | Constant * c2 = ce2->get_constant(); |
---|
| 458 | |
---|
| 459 | if ( c1->get_value() != c2->get_value() ) { |
---|
| 460 | // does not unify if the dimension is different |
---|
| 461 | return; |
---|
| 462 | } |
---|
[1cbca6e] | 463 | } |
---|
| 464 | } |
---|
| 465 | |
---|
[a32b204] | 466 | result = unifyExact( arrayType->get_base(), otherArray->get_base(), env, needAssertions, haveAssertions, openVars, WidenMode( false, false ), indexer ); |
---|
| 467 | } // if |
---|
| 468 | } |
---|
| 469 | |
---|
[f3b0a07] | 470 | template< typename Iterator, typename Func > |
---|
[8d7bef2] | 471 | Type* combineTypes( Iterator begin, Iterator end, Func & toType ) { |
---|
[53e3b4a] | 472 | std::list< Type * > types; |
---|
| 473 | for ( ; begin != end; ++begin ) { |
---|
[64eae56] | 474 | // it's guaranteed that a ttype variable will be bound to a flat tuple, so ensure that this results in a flat tuple |
---|
[f3b0a07] | 475 | flatten( toType( *begin ), back_inserter( types ) ); |
---|
[53e3b4a] | 476 | } |
---|
[8d7bef2] | 477 | return new TupleType{ Type::Qualifiers(), types }; |
---|
[53e3b4a] | 478 | } |
---|
| 479 | |
---|
[a32b204] | 480 | template< typename Iterator1, typename Iterator2 > |
---|
| 481 | bool unifyDeclList( Iterator1 list1Begin, Iterator1 list1End, Iterator2 list2Begin, Iterator2 list2End, TypeEnvironment &env, AssertionSet &needAssertions, AssertionSet &haveAssertions, const OpenVarSet &openVars, const SymTab::Indexer &indexer ) { |
---|
[f3b0a07] | 482 | auto get_type = [](DeclarationWithType * dwt){ return dwt->get_type(); }; |
---|
[a32b204] | 483 | for ( ; list1Begin != list1End && list2Begin != list2End; ++list1Begin, ++list2Begin ) { |
---|
[53e3b4a] | 484 | Type * t1 = (*list1Begin)->get_type(); |
---|
| 485 | Type * t2 = (*list2Begin)->get_type(); |
---|
| 486 | bool isTtype1 = Tuples::isTtype( t1 ); |
---|
| 487 | bool isTtype2 = Tuples::isTtype( t2 ); |
---|
[6c3a988f] | 488 | // xxx - assumes ttype must be last parameter |
---|
| 489 | // xxx - there may be a nice way to refactor this, but be careful because the argument positioning might matter in some cases. |
---|
[53e3b4a] | 490 | if ( isTtype1 && ! isTtype2 ) { |
---|
| 491 | // combine all of the things in list2, then unify |
---|
[8d7bef2] | 492 | return unifyExact( t1, combineTypes( list2Begin, list2End, get_type ), env, needAssertions, haveAssertions, openVars, WidenMode( false, false ), indexer ); |
---|
[53e3b4a] | 493 | } else if ( isTtype2 && ! isTtype1 ) { |
---|
| 494 | // combine all of the things in list1, then unify |
---|
[8d7bef2] | 495 | return unifyExact( combineTypes( list1Begin, list1End, get_type ), t2, env, needAssertions, haveAssertions, openVars, WidenMode( false, false ), indexer ); |
---|
[53e3b4a] | 496 | } else if ( ! unifyExact( t1, t2, env, needAssertions, haveAssertions, openVars, WidenMode( false, false ), indexer ) ) { |
---|
[a32b204] | 497 | return false; |
---|
| 498 | } // if |
---|
| 499 | } // for |
---|
[6c3a988f] | 500 | // may get to the end of one argument list before the end of the other. This is only okay when the other is a ttype |
---|
[4c8621ac] | 501 | if ( list1Begin != list1End ) { |
---|
| 502 | // try unifying empty tuple type with ttype |
---|
| 503 | Type * t1 = (*list1Begin)->get_type(); |
---|
| 504 | if ( Tuples::isTtype( t1 ) ) { |
---|
[8d7bef2] | 505 | return unifyExact( t1, combineTypes( list2Begin, list2End, get_type ), env, needAssertions, haveAssertions, openVars, WidenMode( false, false ), indexer ); |
---|
[4c8621ac] | 506 | } else return false; |
---|
| 507 | } else if ( list2Begin != list2End ) { |
---|
| 508 | // try unifying empty tuple type with ttype |
---|
| 509 | Type * t2 = (*list2Begin)->get_type(); |
---|
| 510 | if ( Tuples::isTtype( t2 ) ) { |
---|
[8d7bef2] | 511 | return unifyExact( combineTypes( list1Begin, list1End, get_type ), t2, env, needAssertions, haveAssertions, openVars, WidenMode( false, false ), indexer ); |
---|
[4c8621ac] | 512 | } else return false; |
---|
[a32b204] | 513 | } else { |
---|
| 514 | return true; |
---|
| 515 | } // if |
---|
| 516 | } |
---|
| 517 | |
---|
[6c3a988f] | 518 | /// Finds ttypes and replaces them with their expansion, if known. |
---|
| 519 | /// This needs to be done so that satisfying ttype assertions is easier. |
---|
| 520 | /// If this isn't done then argument lists can have wildly different |
---|
| 521 | /// size and structure, when they should be compatible. |
---|
[3096ec1] | 522 | struct TtypeExpander : public WithShortCircuiting { |
---|
| 523 | TypeEnvironment & tenv; |
---|
| 524 | TtypeExpander( TypeEnvironment & tenv ) : tenv( tenv ) {} |
---|
| 525 | void premutate( TypeInstType * ) { visit_children = false; } |
---|
| 526 | Type * postmutate( TypeInstType * typeInst ) { |
---|
[8e18b8e] | 527 | if ( const EqvClass *eqvClass = tenv.lookup( typeInst->get_name() ) ) { |
---|
| 528 | // expand ttype parameter into its actual type |
---|
| 529 | if ( eqvClass->data.kind == TypeDecl::Ttype && eqvClass->type ) { |
---|
| 530 | return eqvClass->type->clone(); |
---|
[6c3a988f] | 531 | } |
---|
| 532 | } |
---|
| 533 | return typeInst; |
---|
| 534 | } |
---|
| 535 | }; |
---|
| 536 | |
---|
| 537 | /// flattens a list of declarations, so that each tuple type has a single declaration. |
---|
| 538 | /// makes use of TtypeExpander to ensure ttypes are flat as well. |
---|
| 539 | void flattenList( std::list< DeclarationWithType * > src, std::list< DeclarationWithType * > & dst, TypeEnvironment & env ) { |
---|
| 540 | dst.clear(); |
---|
| 541 | for ( DeclarationWithType * dcl : src ) { |
---|
[3096ec1] | 542 | PassVisitor<TtypeExpander> expander( env ); |
---|
[6c3a988f] | 543 | dcl->acceptMutator( expander ); |
---|
| 544 | std::list< Type * > types; |
---|
| 545 | flatten( dcl->get_type(), back_inserter( types ) ); |
---|
| 546 | for ( Type * t : types ) { |
---|
[1dcd52a3] | 547 | // outermost const, volatile, _Atomic qualifiers in parameters should not play a role in the unification of function types, since they do not determine whether a function is callable. |
---|
| 548 | // Note: MUST consider at least mutex qualifier, since functions can be overloaded on outermost mutex and a mutex function has different requirements than a non-mutex function. |
---|
| 549 | t->get_qualifiers() -= Type::Qualifiers(Type::Const | Type::Volatile | Type::Atomic); |
---|
| 550 | |
---|
[68fe077a] | 551 | dst.push_back( new ObjectDecl( "", Type::StorageClasses(), LinkageSpec::C, nullptr, t, nullptr ) ); |
---|
[6c3a988f] | 552 | } |
---|
| 553 | } |
---|
| 554 | } |
---|
| 555 | |
---|
[36a2367] | 556 | void Unify::postvisit(FunctionType *functionType) { |
---|
[a32b204] | 557 | FunctionType *otherFunction = dynamic_cast< FunctionType* >( type2 ); |
---|
| 558 | if ( otherFunction && functionType->get_isVarArgs() == otherFunction->get_isVarArgs() ) { |
---|
[6c3a988f] | 559 | // flatten the parameter lists for both functions so that tuple structure |
---|
| 560 | // doesn't affect unification. Must be a clone so that the types don't change. |
---|
[8d7bef2] | 561 | FunctionType* flatFunc = functionType->clone(); |
---|
| 562 | FunctionType* flatOther = otherFunction->clone(); |
---|
[6c3a988f] | 563 | flattenList( flatFunc->get_parameters(), flatFunc->get_parameters(), env ); |
---|
| 564 | flattenList( flatOther->get_parameters(), flatOther->get_parameters(), env ); |
---|
| 565 | |
---|
[53e3b4a] | 566 | // sizes don't have to match if ttypes are involved; need to be more precise wrt where the ttype is to prevent errors |
---|
[538334a] | 567 | if ( (flatFunc->parameters.size() == flatOther->parameters.size() && flatFunc->returnVals.size() == flatOther->returnVals.size()) || flatFunc->isTtype() || flatOther->isTtype() ) { |
---|
| 568 | if ( unifyDeclList( flatFunc->parameters.begin(), flatFunc->parameters.end(), flatOther->parameters.begin(), flatOther->parameters.end(), env, needAssertions, haveAssertions, openVars, indexer ) ) { |
---|
| 569 | if ( unifyDeclList( flatFunc->returnVals.begin(), flatFunc->returnVals.end(), flatOther->returnVals.begin(), flatOther->returnVals.end(), env, needAssertions, haveAssertions, openVars, indexer ) ) { |
---|
[1cbca6e] | 570 | |
---|
[6c3a988f] | 571 | // the original types must be used in mark assertions, since pointer comparisons are used |
---|
[03da511] | 572 | markAssertions( haveAssertions, needAssertions, functionType ); |
---|
| 573 | markAssertions( haveAssertions, needAssertions, otherFunction ); |
---|
[41a2620] | 574 | |
---|
[03da511] | 575 | result = true; |
---|
| 576 | } // if |
---|
[a32b204] | 577 | } // if |
---|
| 578 | } // if |
---|
| 579 | } // if |
---|
| 580 | } |
---|
| 581 | |
---|
| 582 | template< typename RefType > |
---|
[02ec390] | 583 | void Unify::handleRefType( RefType *inst, Type *other ) { |
---|
| 584 | // check that other type is compatible and named the same |
---|
[a32b204] | 585 | RefType *otherStruct = dynamic_cast< RefType* >( other ); |
---|
[538334a] | 586 | result = otherStruct && inst->name == otherStruct->name; |
---|
[02ec390] | 587 | } |
---|
| 588 | |
---|
| 589 | template< typename RefType > |
---|
| 590 | void Unify::handleGenericRefType( RefType *inst, Type *other ) { |
---|
| 591 | // Check that other type is compatible and named the same |
---|
| 592 | handleRefType( inst, other ); |
---|
| 593 | if ( ! result ) return; |
---|
[f5234f3] | 594 | // Check that parameters of types unify, if any |
---|
[538334a] | 595 | std::list< Expression* > params = inst->parameters; |
---|
| 596 | std::list< Expression* > otherParams = ((RefType*)other)->parameters; |
---|
[f5234f3] | 597 | |
---|
| 598 | std::list< Expression* >::const_iterator it = params.begin(), jt = otherParams.begin(); |
---|
| 599 | for ( ; it != params.end() && jt != otherParams.end(); ++it, ++jt ) { |
---|
| 600 | TypeExpr *param = dynamic_cast< TypeExpr* >(*it); |
---|
[b2daebd4] | 601 | assertf(param, "Aggregate parameters should be type expressions"); |
---|
[f5234f3] | 602 | TypeExpr *otherParam = dynamic_cast< TypeExpr* >(*jt); |
---|
[b2daebd4] | 603 | assertf(otherParam, "Aggregate parameters should be type expressions"); |
---|
[ce8c12f] | 604 | |
---|
[b2daebd4] | 605 | Type* paramTy = param->get_type(); |
---|
| 606 | Type* otherParamTy = otherParam->get_type(); |
---|
[f5234f3] | 607 | |
---|
[b2daebd4] | 608 | bool tupleParam = Tuples::isTtype( paramTy ); |
---|
| 609 | bool otherTupleParam = Tuples::isTtype( otherParamTy ); |
---|
| 610 | |
---|
| 611 | if ( tupleParam && otherTupleParam ) { |
---|
| 612 | ++it; ++jt; // skip ttype parameters for break |
---|
| 613 | } else if ( tupleParam ) { |
---|
| 614 | // bundle other parameters into tuple to match |
---|
[62423350] | 615 | std::list< Type * > binderTypes; |
---|
[b2daebd4] | 616 | |
---|
| 617 | do { |
---|
[62423350] | 618 | binderTypes.push_back( otherParam->get_type()->clone() ); |
---|
[b2daebd4] | 619 | ++jt; |
---|
| 620 | |
---|
| 621 | if ( jt == otherParams.end() ) break; |
---|
| 622 | |
---|
| 623 | otherParam = dynamic_cast< TypeExpr* >(*jt); |
---|
| 624 | assertf(otherParam, "Aggregate parameters should be type expressions"); |
---|
| 625 | } while (true); |
---|
| 626 | |
---|
[62423350] | 627 | otherParamTy = new TupleType{ paramTy->get_qualifiers(), binderTypes }; |
---|
[b2daebd4] | 628 | ++it; // skip ttype parameter for break |
---|
| 629 | } else if ( otherTupleParam ) { |
---|
| 630 | // bundle parameters into tuple to match other |
---|
[62423350] | 631 | std::list< Type * > binderTypes; |
---|
[b2daebd4] | 632 | |
---|
| 633 | do { |
---|
[62423350] | 634 | binderTypes.push_back( param->get_type()->clone() ); |
---|
[b2daebd4] | 635 | ++it; |
---|
| 636 | |
---|
| 637 | if ( it == params.end() ) break; |
---|
| 638 | |
---|
| 639 | param = dynamic_cast< TypeExpr* >(*it); |
---|
| 640 | assertf(param, "Aggregate parameters should be type expressions"); |
---|
| 641 | } while (true); |
---|
| 642 | |
---|
[62423350] | 643 | paramTy = new TupleType{ otherParamTy->get_qualifiers(), binderTypes }; |
---|
[b2daebd4] | 644 | ++jt; // skip ttype parameter for break |
---|
| 645 | } |
---|
| 646 | |
---|
| 647 | if ( ! unifyExact( paramTy, otherParamTy, env, needAssertions, haveAssertions, openVars, WidenMode(false, false), indexer ) ) { |
---|
[02ec390] | 648 | result = false; |
---|
| 649 | return; |
---|
| 650 | } |
---|
[b2daebd4] | 651 | |
---|
| 652 | // ttype parameter should be last |
---|
| 653 | if ( tupleParam || otherTupleParam ) break; |
---|
[02ec390] | 654 | } |
---|
[f5234f3] | 655 | result = ( it == params.end() && jt == otherParams.end() ); |
---|
[02ec390] | 656 | } |
---|
[a32b204] | 657 | |
---|
[36a2367] | 658 | void Unify::postvisit(StructInstType *structInst) { |
---|
[02ec390] | 659 | handleGenericRefType( structInst, type2 ); |
---|
[a32b204] | 660 | } |
---|
| 661 | |
---|
[36a2367] | 662 | void Unify::postvisit(UnionInstType *unionInst) { |
---|
[02ec390] | 663 | handleGenericRefType( unionInst, type2 ); |
---|
[a32b204] | 664 | } |
---|
| 665 | |
---|
[36a2367] | 666 | void Unify::postvisit(EnumInstType *enumInst) { |
---|
[a32b204] | 667 | handleRefType( enumInst, type2 ); |
---|
| 668 | } |
---|
| 669 | |
---|
[36a2367] | 670 | void Unify::postvisit(TraitInstType *contextInst) { |
---|
[a32b204] | 671 | handleRefType( contextInst, type2 ); |
---|
| 672 | } |
---|
| 673 | |
---|
[36a2367] | 674 | void Unify::postvisit(TypeInstType *typeInst) { |
---|
[a32b204] | 675 | assert( openVars.find( typeInst->get_name() ) == openVars.end() ); |
---|
| 676 | TypeInstType *otherInst = dynamic_cast< TypeInstType* >( type2 ); |
---|
| 677 | if ( otherInst && typeInst->get_name() == otherInst->get_name() ) { |
---|
| 678 | result = true; |
---|
[51b7345] | 679 | /// } else { |
---|
| 680 | /// NamedTypeDecl *nt = indexer.lookupType( typeInst->get_name() ); |
---|
[a32b204] | 681 | /// if ( nt ) { |
---|
[51b7345] | 682 | /// TypeDecl *type = dynamic_cast< TypeDecl* >( nt ); |
---|
| 683 | /// assert( type ); |
---|
[a32b204] | 684 | /// if ( type->get_base() ) { |
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[51b7345] | 685 | /// result = unifyExact( type->get_base(), typeInst, env, needAssertions, haveAssertions, openVars, WidenMode( false, false ), indexer ); |
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| 686 | /// } |
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| 687 | /// } |
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[a32b204] | 688 | } // if |
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| 689 | } |
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| 690 | |
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| 691 | template< typename Iterator1, typename Iterator2 > |
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[c77fd8b] | 692 | bool unifyList( Iterator1 list1Begin, Iterator1 list1End, Iterator2 list2Begin, Iterator2 list2End, TypeEnvironment &env, AssertionSet &needAssertions, AssertionSet &haveAssertions, const OpenVarSet &openVars, const SymTab::Indexer &indexer ) { |
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[f3b0a07] | 693 | auto get_type = [](Type * t) { return t; }; |
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[a32b204] | 694 | for ( ; list1Begin != list1End && list2Begin != list2End; ++list1Begin, ++list2Begin ) { |
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[f3b0a07] | 695 | Type * t1 = *list1Begin; |
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| 696 | Type * t2 = *list2Begin; |
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| 697 | bool isTtype1 = Tuples::isTtype( t1 ); |
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| 698 | bool isTtype2 = Tuples::isTtype( t2 ); |
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| 699 | // xxx - assumes ttype must be last parameter |
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| 700 | // xxx - there may be a nice way to refactor this, but be careful because the argument positioning might matter in some cases. |
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| 701 | if ( isTtype1 && ! isTtype2 ) { |
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| 702 | // combine all of the things in list2, then unify |
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[8d7bef2] | 703 | return unifyExact( t1, combineTypes( list2Begin, list2End, get_type ), env, needAssertions, haveAssertions, openVars, WidenMode( false, false ), indexer ); |
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[f3b0a07] | 704 | } else if ( isTtype2 && ! isTtype1 ) { |
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| 705 | // combine all of the things in list1, then unify |
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[8d7bef2] | 706 | return unifyExact( combineTypes( list1Begin, list1End, get_type ), t2, env, needAssertions, haveAssertions, openVars, WidenMode( false, false ), indexer ); |
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[f3b0a07] | 707 | } else if ( ! unifyExact( t1, t2, env, needAssertions, haveAssertions, openVars, WidenMode( false, false ), indexer ) ) { |
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[a32b204] | 708 | return false; |
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[f3b0a07] | 709 | } // if |
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| 710 | |
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[a32b204] | 711 | } // for |
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[f3b0a07] | 712 | if ( list1Begin != list1End ) { |
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| 713 | // try unifying empty tuple type with ttype |
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| 714 | Type * t1 = *list1Begin; |
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| 715 | if ( Tuples::isTtype( t1 ) ) { |
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[8d7bef2] | 716 | return unifyExact( t1, combineTypes( list2Begin, list2End, get_type ), env, needAssertions, haveAssertions, openVars, WidenMode( false, false ), indexer ); |
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[f3b0a07] | 717 | } else return false; |
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| 718 | } else if ( list2Begin != list2End ) { |
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| 719 | // try unifying empty tuple type with ttype |
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| 720 | Type * t2 = *list2Begin; |
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| 721 | if ( Tuples::isTtype( t2 ) ) { |
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[8d7bef2] | 722 | return unifyExact( combineTypes( list1Begin, list1End, get_type ), t2, env, needAssertions, haveAssertions, openVars, WidenMode( false, false ), indexer ); |
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[f3b0a07] | 723 | } else return false; |
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[a32b204] | 724 | } else { |
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| 725 | return true; |
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[f3b0a07] | 726 | } // if |
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[a32b204] | 727 | } |
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| 728 | |
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[36a2367] | 729 | void Unify::postvisit(TupleType *tupleType) { |
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[a32b204] | 730 | if ( TupleType *otherTuple = dynamic_cast< TupleType* >( type2 ) ) { |
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[8d7bef2] | 731 | TupleType* flat1 = tupleType->clone(); |
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| 732 | TupleType* flat2 = otherTuple->clone(); |
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[f3b0a07] | 733 | std::list<Type *> types1, types2; |
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| 734 | |
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[3096ec1] | 735 | PassVisitor<TtypeExpander> expander( env ); |
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[f3b0a07] | 736 | flat1->acceptMutator( expander ); |
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| 737 | flat2->acceptMutator( expander ); |
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| 738 | |
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[8d7bef2] | 739 | flatten( flat1, back_inserter( types1 ) ); |
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| 740 | flatten( flat2, back_inserter( types2 ) ); |
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[f3b0a07] | 741 | |
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[c77fd8b] | 742 | result = unifyList( types1.begin(), types1.end(), types2.begin(), types2.end(), env, needAssertions, haveAssertions, openVars, indexer ); |
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[a32b204] | 743 | } // if |
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| 744 | } |
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[51b7345] | 745 | |
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[36a2367] | 746 | void Unify::postvisit( __attribute__((unused)) VarArgsType *varArgsType ) { |
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[44b7088] | 747 | result = dynamic_cast< VarArgsType* >( type2 ); |
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| 748 | } |
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| 749 | |
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[36a2367] | 750 | void Unify::postvisit( __attribute__((unused)) ZeroType *zeroType ) { |
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[89e6ffc] | 751 | result = dynamic_cast< ZeroType* >( type2 ); |
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| 752 | } |
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| 753 | |
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[36a2367] | 754 | void Unify::postvisit( __attribute__((unused)) OneType *oneType ) { |
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[89e6ffc] | 755 | result = dynamic_cast< OneType* >( type2 ); |
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| 756 | } |
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| 757 | |
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[906e24d] | 758 | // xxx - compute once and store in the FunctionType? |
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| 759 | Type * extractResultType( FunctionType * function ) { |
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| 760 | if ( function->get_returnVals().size() == 0 ) { |
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| 761 | return new VoidType( Type::Qualifiers() ); |
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| 762 | } else if ( function->get_returnVals().size() == 1 ) { |
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| 763 | return function->get_returnVals().front()->get_type()->clone(); |
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| 764 | } else { |
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[62423350] | 765 | std::list< Type * > types; |
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[906e24d] | 766 | for ( DeclarationWithType * decl : function->get_returnVals() ) { |
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[62423350] | 767 | types.push_back( decl->get_type()->clone() ); |
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[906e24d] | 768 | } // for |
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[62423350] | 769 | return new TupleType( Type::Qualifiers(), types ); |
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[906e24d] | 770 | } |
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| 771 | } |
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[51b7345] | 772 | } // namespace ResolvExpr |
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[a32b204] | 773 | |
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| 774 | // Local Variables: // |
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| 775 | // tab-width: 4 // |
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| 776 | // mode: c++ // |
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| 777 | // compile-command: "make install" // |
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| 778 | // End: // |
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