[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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[aeef2bd] | 19 | #include <memory> // for unique_ptr |
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[ea6332d] | 20 | #include <set> // for set |
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| 21 | #include <string> // for string, operator==, operator!=, bas... |
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| 22 | #include <utility> // for pair |
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[51b7345] | 23 | |
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[3096ec1] | 24 | #include "Common/PassVisitor.h" // for PassVisitor |
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[ea6332d] | 25 | #include "FindOpenVars.h" // for findOpenVars |
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| 26 | #include "Parser/LinkageSpec.h" // for C |
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| 27 | #include "SynTree/Constant.h" // for Constant |
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| 28 | #include "SynTree/Declaration.h" // for TypeDecl, TypeDecl::Data, Declarati... |
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| 29 | #include "SynTree/Expression.h" // for TypeExpr, Expression, ConstantExpr |
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| 30 | #include "SynTree/Mutator.h" // for Mutator |
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| 31 | #include "SynTree/Type.h" // for Type, TypeInstType, FunctionType |
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| 32 | #include "SynTree/Visitor.h" // for Visitor |
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| 33 | #include "Tuples/Tuples.h" // for isTtype |
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| 34 | #include "TypeEnvironment.h" // for EqvClass, AssertionSet, OpenVarSet |
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[51b7345] | 35 | #include "Unify.h" |
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[ea6332d] | 36 | #include "typeops.h" // for flatten, occurs, commonType |
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| 37 | |
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| 38 | namespace SymTab { |
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| 39 | class Indexer; |
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| 40 | } // namespace SymTab |
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[51b7345] | 41 | |
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[1cbca6e] | 42 | // #define DEBUG |
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[51b7345] | 43 | |
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| 44 | namespace ResolvExpr { |
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| 45 | |
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[36a2367] | 46 | struct Unify : public WithShortCircuiting { |
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[a32b204] | 47 | Unify( Type *type2, TypeEnvironment &env, AssertionSet &needAssertions, AssertionSet &haveAssertions, const OpenVarSet &openVars, WidenMode widenMode, const SymTab::Indexer &indexer ); |
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[41a2620] | 48 | |
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[a32b204] | 49 | bool get_result() const { return result; } |
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| 50 | |
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[36a2367] | 51 | void previsit( BaseSyntaxNode * ) { visit_children = false; } |
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| 52 | |
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| 53 | void postvisit( VoidType * voidType ); |
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| 54 | void postvisit( BasicType * basicType ); |
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| 55 | void postvisit( PointerType * pointerType ); |
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| 56 | void postvisit( ArrayType * arrayType ); |
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| 57 | void postvisit( ReferenceType * refType ); |
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| 58 | void postvisit( FunctionType * functionType ); |
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| 59 | void postvisit( StructInstType * aggregateUseType ); |
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| 60 | void postvisit( UnionInstType * aggregateUseType ); |
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| 61 | void postvisit( EnumInstType * aggregateUseType ); |
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| 62 | void postvisit( TraitInstType * aggregateUseType ); |
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| 63 | void postvisit( TypeInstType * aggregateUseType ); |
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| 64 | void postvisit( TupleType * tupleType ); |
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| 65 | void postvisit( VarArgsType * varArgsType ); |
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| 66 | void postvisit( ZeroType * zeroType ); |
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| 67 | void postvisit( OneType * oneType ); |
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| 68 | |
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| 69 | private: |
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[a32b204] | 70 | template< typename RefType > void handleRefType( RefType *inst, Type *other ); |
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[02ec390] | 71 | template< typename RefType > void handleGenericRefType( RefType *inst, Type *other ); |
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[a32b204] | 72 | |
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| 73 | bool result; |
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| 74 | Type *type2; // inherited |
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| 75 | TypeEnvironment &env; |
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| 76 | AssertionSet &needAssertions; |
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| 77 | AssertionSet &haveAssertions; |
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| 78 | const OpenVarSet &openVars; |
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| 79 | WidenMode widenMode; |
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| 80 | const SymTab::Indexer &indexer; |
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| 81 | }; |
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| 82 | |
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[eb50842] | 83 | /// Attempts an inexact unification of type1 and type2. |
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| 84 | /// 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] | 85 | 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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| 86 | 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] | 87 | |
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[a32b204] | 88 | bool typesCompatible( Type *first, Type *second, const SymTab::Indexer &indexer, const TypeEnvironment &env ) { |
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| 89 | TypeEnvironment newEnv; |
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[1cbca6e] | 90 | OpenVarSet openVars, closedVars; // added closedVars |
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[a32b204] | 91 | AssertionSet needAssertions, haveAssertions; |
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| 92 | Type *newFirst = first->clone(), *newSecond = second->clone(); |
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| 93 | env.apply( newFirst ); |
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| 94 | env.apply( newSecond ); |
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[1cbca6e] | 95 | |
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| 96 | // do we need to do this? Seems like we do, types should be able to be compatible if they |
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| 97 | // have free variables that can unify |
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| 98 | findOpenVars( newFirst, openVars, closedVars, needAssertions, haveAssertions, false ); |
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| 99 | findOpenVars( newSecond, openVars, closedVars, needAssertions, haveAssertions, true ); |
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| 100 | |
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[a32b204] | 101 | bool result = unifyExact( newFirst, newSecond, newEnv, needAssertions, haveAssertions, openVars, WidenMode( false, false ), indexer ); |
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| 102 | delete newFirst; |
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| 103 | delete newSecond; |
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| 104 | return result; |
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| 105 | } |
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| 106 | |
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| 107 | bool typesCompatibleIgnoreQualifiers( Type *first, Type *second, const SymTab::Indexer &indexer, const TypeEnvironment &env ) { |
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| 108 | TypeEnvironment newEnv; |
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| 109 | OpenVarSet openVars; |
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| 110 | AssertionSet needAssertions, haveAssertions; |
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| 111 | Type *newFirst = first->clone(), *newSecond = second->clone(); |
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| 112 | env.apply( newFirst ); |
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| 113 | env.apply( newSecond ); |
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| 114 | newFirst->get_qualifiers() = Type::Qualifiers(); |
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| 115 | newSecond->get_qualifiers() = Type::Qualifiers(); |
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[2c57025] | 116 | /// std::cerr << "first is "; |
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| 117 | /// first->print( std::cerr ); |
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| 118 | /// std::cerr << std::endl << "second is "; |
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| 119 | /// second->print( std::cerr ); |
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| 120 | /// std::cerr << std::endl << "newFirst is "; |
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| 121 | /// newFirst->print( std::cerr ); |
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| 122 | /// std::cerr << std::endl << "newSecond is "; |
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| 123 | /// newSecond->print( std::cerr ); |
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| 124 | /// std::cerr << std::endl; |
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[a32b204] | 125 | bool result = unifyExact( newFirst, newSecond, newEnv, needAssertions, haveAssertions, openVars, WidenMode( false, false ), indexer ); |
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| 126 | delete newFirst; |
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| 127 | delete newSecond; |
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| 128 | return result; |
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| 129 | } |
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| 130 | |
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[d7dc824] | 131 | bool isFtype( Type *type ) { |
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[a32b204] | 132 | if ( dynamic_cast< FunctionType* >( type ) ) { |
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| 133 | return true; |
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| 134 | } else if ( TypeInstType *typeInst = dynamic_cast< TypeInstType* >( type ) ) { |
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| 135 | return typeInst->get_isFtype(); |
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| 136 | } // if |
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| 137 | return false; |
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| 138 | } |
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| 139 | |
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[d7dc824] | 140 | bool tyVarCompatible( const TypeDecl::Data & data, Type *type ) { |
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[2c57025] | 141 | switch ( data.kind ) { |
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[a32b204] | 142 | case TypeDecl::Dtype: |
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[2c57025] | 143 | // to bind to an object type variable, the type must not be a function type. |
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| 144 | // if the type variable is specified to be a complete type then the incoming |
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| 145 | // type must also be complete |
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[6c3a988f] | 146 | // xxx - should this also check that type is not a tuple type and that it's not a ttype? |
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[d7dc824] | 147 | return ! isFtype( type ) && (! data.isComplete || type->isComplete() ); |
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[a32b204] | 148 | case TypeDecl::Ftype: |
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[d7dc824] | 149 | return isFtype( type ); |
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[b2daebd4] | 150 | case TypeDecl::Ttype: |
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[6c3a988f] | 151 | // ttype unifies with any tuple type |
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[f3b0a07] | 152 | return dynamic_cast< TupleType * >( type ) || Tuples::isTtype( type ); |
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[a32b204] | 153 | } // switch |
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| 154 | return false; |
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| 155 | } |
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| 156 | |
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[2c57025] | 157 | 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] | 158 | // remove references from other, so that type variables can only bind to value types |
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| 159 | other = other->stripReferences(); |
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[a32b204] | 160 | OpenVarSet::const_iterator tyvar = openVars.find( typeInst->get_name() ); |
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| 161 | assert( tyvar != openVars.end() ); |
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[d7dc824] | 162 | if ( ! tyVarCompatible( tyvar->second, other ) ) { |
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[a32b204] | 163 | return false; |
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| 164 | } // if |
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| 165 | if ( occurs( other, typeInst->get_name(), env ) ) { |
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| 166 | return false; |
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| 167 | } // if |
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| 168 | EqvClass curClass; |
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| 169 | if ( env.lookup( typeInst->get_name(), curClass ) ) { |
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| 170 | if ( curClass.type ) { |
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| 171 | Type *common = 0; |
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[eb50842] | 172 | // 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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[aeef2bd] | 173 | std::unique_ptr< Type > newType( curClass.type->clone() ); |
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[721f17a] | 174 | newType->get_qualifiers() = typeInst->get_qualifiers(); |
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[a32b204] | 175 | if ( unifyInexact( newType.get(), other, env, needAssertions, haveAssertions, openVars, widenMode & WidenMode( curClass.allowWidening, true ), indexer, common ) ) { |
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| 176 | if ( common ) { |
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| 177 | common->get_qualifiers() = Type::Qualifiers(); |
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| 178 | delete curClass.type; |
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| 179 | curClass.type = common; |
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| 180 | env.add( curClass ); |
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| 181 | } // if |
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| 182 | return true; |
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| 183 | } else { |
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| 184 | return false; |
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| 185 | } // if |
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| 186 | } else { |
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| 187 | curClass.type = other->clone(); |
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| 188 | curClass.type->get_qualifiers() = Type::Qualifiers(); |
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| 189 | curClass.allowWidening = widenMode.widenFirst && widenMode.widenSecond; |
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| 190 | env.add( curClass ); |
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| 191 | } // if |
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| 192 | } else { |
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| 193 | EqvClass newClass; |
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| 194 | newClass.vars.insert( typeInst->get_name() ); |
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| 195 | newClass.type = other->clone(); |
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| 196 | newClass.type->get_qualifiers() = Type::Qualifiers(); |
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| 197 | newClass.allowWidening = widenMode.widenFirst && widenMode.widenSecond; |
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[2c57025] | 198 | newClass.data = data; |
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[a32b204] | 199 | env.add( newClass ); |
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| 200 | } // if |
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| 201 | return true; |
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| 202 | } |
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| 203 | |
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[2c57025] | 204 | 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] | 205 | bool result = true; |
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| 206 | EqvClass class1, class2; |
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| 207 | bool hasClass1 = false, hasClass2 = false; |
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| 208 | bool widen1 = false, widen2 = false; |
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| 209 | Type *type1 = 0, *type2 = 0; |
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[41a2620] | 210 | |
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[a32b204] | 211 | if ( env.lookup( var1->get_name(), class1 ) ) { |
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| 212 | hasClass1 = true; |
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| 213 | if ( class1.type ) { |
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| 214 | if ( occurs( class1.type, var2->get_name(), env ) ) { |
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| 215 | return false; |
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| 216 | } // if |
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| 217 | type1 = class1.type->clone(); |
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| 218 | } // if |
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| 219 | widen1 = widenMode.widenFirst && class1.allowWidening; |
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| 220 | } // if |
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| 221 | if ( env.lookup( var2->get_name(), class2 ) ) { |
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| 222 | hasClass2 = true; |
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| 223 | if ( class2.type ) { |
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| 224 | if ( occurs( class2.type, var1->get_name(), env ) ) { |
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| 225 | return false; |
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| 226 | } // if |
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| 227 | type2 = class2.type->clone(); |
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| 228 | } // if |
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| 229 | widen2 = widenMode.widenSecond && class2.allowWidening; |
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| 230 | } // if |
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[41a2620] | 231 | |
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[a32b204] | 232 | if ( type1 && type2 ) { |
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[2c57025] | 233 | // std::cerr << "has type1 && type2" << std::endl; |
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[a32b204] | 234 | WidenMode newWidenMode ( widen1, widen2 ); |
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| 235 | Type *common = 0; |
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| 236 | if ( unifyInexact( type1, type2, env, needAssertions, haveAssertions, openVars, newWidenMode, indexer, common ) ) { |
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| 237 | class1.vars.insert( class2.vars.begin(), class2.vars.end() ); |
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| 238 | class1.allowWidening = widen1 && widen2; |
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| 239 | if ( common ) { |
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| 240 | common->get_qualifiers() = Type::Qualifiers(); |
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| 241 | delete class1.type; |
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| 242 | class1.type = common; |
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| 243 | } // if |
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| 244 | env.add( class1 ); |
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| 245 | } else { |
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| 246 | result = false; |
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| 247 | } // if |
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| 248 | } else if ( hasClass1 && hasClass2 ) { |
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| 249 | if ( type1 ) { |
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| 250 | class1.vars.insert( class2.vars.begin(), class2.vars.end() ); |
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| 251 | class1.allowWidening = widen1; |
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| 252 | env.add( class1 ); |
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| 253 | } else { |
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| 254 | class2.vars.insert( class1.vars.begin(), class1.vars.end() ); |
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| 255 | class2.allowWidening = widen2; |
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| 256 | env.add( class2 ); |
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| 257 | } // if |
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| 258 | } else if ( hasClass1 ) { |
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| 259 | class1.vars.insert( var2->get_name() ); |
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| 260 | class1.allowWidening = widen1; |
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| 261 | env.add( class1 ); |
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| 262 | } else if ( hasClass2 ) { |
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| 263 | class2.vars.insert( var1->get_name() ); |
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| 264 | class2.allowWidening = widen2; |
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| 265 | env.add( class2 ); |
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| 266 | } else { |
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| 267 | EqvClass newClass; |
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| 268 | newClass.vars.insert( var1->get_name() ); |
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| 269 | newClass.vars.insert( var2->get_name() ); |
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| 270 | newClass.allowWidening = widen1 && widen2; |
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[2c57025] | 271 | newClass.data = data; |
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[a32b204] | 272 | env.add( newClass ); |
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| 273 | } // if |
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| 274 | delete type1; |
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| 275 | delete type2; |
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| 276 | return result; |
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| 277 | } |
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| 278 | |
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| 279 | bool unify( Type *type1, Type *type2, TypeEnvironment &env, AssertionSet &needAssertions, AssertionSet &haveAssertions, OpenVarSet &openVars, const SymTab::Indexer &indexer ) { |
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| 280 | OpenVarSet closedVars; |
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| 281 | findOpenVars( type1, openVars, closedVars, needAssertions, haveAssertions, false ); |
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| 282 | findOpenVars( type2, openVars, closedVars, needAssertions, haveAssertions, true ); |
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| 283 | Type *commonType = 0; |
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| 284 | if ( unifyInexact( type1, type2, env, needAssertions, haveAssertions, openVars, WidenMode( true, true ), indexer, commonType ) ) { |
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| 285 | if ( commonType ) { |
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| 286 | delete commonType; |
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| 287 | } // if |
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| 288 | return true; |
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| 289 | } else { |
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| 290 | return false; |
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| 291 | } // if |
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| 292 | } |
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| 293 | |
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| 294 | bool unify( Type *type1, Type *type2, TypeEnvironment &env, AssertionSet &needAssertions, AssertionSet &haveAssertions, OpenVarSet &openVars, const SymTab::Indexer &indexer, Type *&commonType ) { |
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| 295 | OpenVarSet closedVars; |
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| 296 | findOpenVars( type1, openVars, closedVars, needAssertions, haveAssertions, false ); |
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| 297 | findOpenVars( type2, openVars, closedVars, needAssertions, haveAssertions, true ); |
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| 298 | return unifyInexact( type1, type2, env, needAssertions, haveAssertions, openVars, WidenMode( true, true ), indexer, commonType ); |
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| 299 | } |
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| 300 | |
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| 301 | 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] | 302 | #ifdef DEBUG |
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[a32b204] | 303 | TypeEnvironment debugEnv( env ); |
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[51b7345] | 304 | #endif |
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[eb50842] | 305 | if ( type1->get_qualifiers() != type2->get_qualifiers() ) { |
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| 306 | return false; |
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| 307 | } |
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| 308 | |
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[a32b204] | 309 | bool result; |
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| 310 | TypeInstType *var1 = dynamic_cast< TypeInstType* >( type1 ); |
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| 311 | TypeInstType *var2 = dynamic_cast< TypeInstType* >( type2 ); |
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| 312 | OpenVarSet::const_iterator entry1, entry2; |
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| 313 | if ( var1 ) { |
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| 314 | entry1 = openVars.find( var1->get_name() ); |
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| 315 | } // if |
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| 316 | if ( var2 ) { |
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| 317 | entry2 = openVars.find( var2->get_name() ); |
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| 318 | } // if |
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| 319 | bool isopen1 = var1 && ( entry1 != openVars.end() ); |
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| 320 | bool isopen2 = var2 && ( entry2 != openVars.end() ); |
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[eb50842] | 321 | |
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| 322 | if ( isopen1 && isopen2 && entry1->second == entry2->second ) { |
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[a32b204] | 323 | result = bindVarToVar( var1, var2, entry1->second, env, needAssertions, haveAssertions, openVars, widenMode, indexer ); |
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| 324 | } else if ( isopen1 ) { |
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| 325 | result = bindVar( var1, type2, entry1->second, env, needAssertions, haveAssertions, openVars, widenMode, indexer ); |
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[0873d22e] | 326 | } else if ( isopen2 ) { // TODO: swap widenMode values in call, since type positions are flipped? |
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[a32b204] | 327 | result = bindVar( var2, type1, entry2->second, env, needAssertions, haveAssertions, openVars, widenMode, indexer ); |
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| 328 | } else { |
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[36a2367] | 329 | PassVisitor<Unify> comparator( type2, env, needAssertions, haveAssertions, openVars, widenMode, indexer ); |
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[a32b204] | 330 | type1->accept( comparator ); |
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[36a2367] | 331 | result = comparator.pass.get_result(); |
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[a32b204] | 332 | } // if |
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[51b7345] | 333 | #ifdef DEBUG |
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[2c57025] | 334 | std::cerr << "============ unifyExact" << std::endl; |
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| 335 | std::cerr << "type1 is "; |
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| 336 | type1->print( std::cerr ); |
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| 337 | std::cerr << std::endl << "type2 is "; |
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| 338 | type2->print( std::cerr ); |
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| 339 | std::cerr << std::endl << "openVars are "; |
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| 340 | printOpenVarSet( openVars, std::cerr, 8 ); |
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| 341 | std::cerr << std::endl << "input env is " << std::endl; |
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| 342 | debugEnv.print( std::cerr, 8 ); |
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| 343 | std::cerr << std::endl << "result env is " << std::endl; |
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| 344 | env.print( std::cerr, 8 ); |
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| 345 | std::cerr << "result is " << result << std::endl; |
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[51b7345] | 346 | #endif |
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[a32b204] | 347 | return result; |
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| 348 | } |
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| 349 | |
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| 350 | bool unifyExact( Type *type1, Type *type2, TypeEnvironment &env, AssertionSet &needAssertions, AssertionSet &haveAssertions, OpenVarSet &openVars, const SymTab::Indexer &indexer ) { |
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| 351 | return unifyExact( type1, type2, env, needAssertions, haveAssertions, openVars, WidenMode( false, false ), indexer ); |
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| 352 | } |
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| 353 | |
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| 354 | 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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| 355 | Type::Qualifiers tq1 = type1->get_qualifiers(), tq2 = type2->get_qualifiers(); |
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| 356 | type1->get_qualifiers() = Type::Qualifiers(); |
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| 357 | type2->get_qualifiers() = Type::Qualifiers(); |
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| 358 | bool result; |
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[51b7345] | 359 | #ifdef DEBUG |
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[2c57025] | 360 | std::cerr << "unifyInexact type 1 is "; |
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| 361 | type1->print( std::cerr ); |
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[0b150ec] | 362 | std::cerr << " type 2 is "; |
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[2c57025] | 363 | type2->print( std::cerr ); |
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| 364 | std::cerr << std::endl; |
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[51b7345] | 365 | #endif |
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[a32b204] | 366 | if ( ! unifyExact( type1, type2, env, needAssertions, haveAssertions, openVars, widenMode, indexer ) ) { |
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[51b7345] | 367 | #ifdef DEBUG |
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[2c57025] | 368 | std::cerr << "unifyInexact: no exact unification found" << std::endl; |
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[51b7345] | 369 | #endif |
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[a32b204] | 370 | if ( ( common = commonType( type1, type2, widenMode.widenFirst, widenMode.widenSecond, indexer, env, openVars ) ) ) { |
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[6f95000] | 371 | common->get_qualifiers() = tq1 | tq2; |
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[51b7345] | 372 | #ifdef DEBUG |
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[2c57025] | 373 | std::cerr << "unifyInexact: common type is "; |
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| 374 | common->print( std::cerr ); |
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| 375 | std::cerr << std::endl; |
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[51b7345] | 376 | #endif |
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[a32b204] | 377 | result = true; |
---|
| 378 | } else { |
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[51b7345] | 379 | #ifdef DEBUG |
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[2c57025] | 380 | std::cerr << "unifyInexact: no common type found" << std::endl; |
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[51b7345] | 381 | #endif |
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[a32b204] | 382 | result = false; |
---|
| 383 | } // if |
---|
| 384 | } else { |
---|
| 385 | if ( tq1 != tq2 ) { |
---|
| 386 | if ( ( tq1 > tq2 || widenMode.widenFirst ) && ( tq2 > tq1 || widenMode.widenSecond ) ) { |
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| 387 | common = type1->clone(); |
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[6f95000] | 388 | common->get_qualifiers() = tq1 | tq2; |
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[a32b204] | 389 | result = true; |
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| 390 | } else { |
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| 391 | result = false; |
---|
| 392 | } // if |
---|
| 393 | } else { |
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[e6cee92] | 394 | common = type1->clone(); |
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| 395 | common->get_qualifiers() = tq1 | tq2; |
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[a32b204] | 396 | result = true; |
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| 397 | } // if |
---|
| 398 | } // if |
---|
| 399 | type1->get_qualifiers() = tq1; |
---|
| 400 | type2->get_qualifiers() = tq2; |
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| 401 | return result; |
---|
| 402 | } |
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| 403 | |
---|
| 404 | Unify::Unify( Type *type2, TypeEnvironment &env, AssertionSet &needAssertions, AssertionSet &haveAssertions, const OpenVarSet &openVars, WidenMode widenMode, const SymTab::Indexer &indexer ) |
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| 405 | : result( false ), type2( type2 ), env( env ), needAssertions( needAssertions ), haveAssertions( haveAssertions ), openVars( openVars ), widenMode( widenMode ), indexer( indexer ) { |
---|
| 406 | } |
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| 407 | |
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[36a2367] | 408 | void Unify::postvisit( __attribute__((unused)) VoidType *voidType) { |
---|
[a32b204] | 409 | result = dynamic_cast< VoidType* >( type2 ); |
---|
| 410 | } |
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| 411 | |
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[36a2367] | 412 | void Unify::postvisit(BasicType *basicType) { |
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[a32b204] | 413 | if ( BasicType *otherBasic = dynamic_cast< BasicType* >( type2 ) ) { |
---|
| 414 | result = basicType->get_kind() == otherBasic->get_kind(); |
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| 415 | } // if |
---|
| 416 | } |
---|
| 417 | |
---|
| 418 | void markAssertionSet( AssertionSet &assertions, DeclarationWithType *assert ) { |
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[2c57025] | 419 | /// std::cerr << "assertion set is" << std::endl; |
---|
| 420 | /// printAssertionSet( assertions, std::cerr, 8 ); |
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| 421 | /// std::cerr << "looking for "; |
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| 422 | /// assert->print( std::cerr ); |
---|
| 423 | /// std::cerr << std::endl; |
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[a32b204] | 424 | AssertionSet::iterator i = assertions.find( assert ); |
---|
| 425 | if ( i != assertions.end() ) { |
---|
[2c57025] | 426 | /// std::cerr << "found it!" << std::endl; |
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[6c3a988f] | 427 | i->second.isUsed = true; |
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[a32b204] | 428 | } // if |
---|
| 429 | } |
---|
| 430 | |
---|
| 431 | void markAssertions( AssertionSet &assertion1, AssertionSet &assertion2, Type *type ) { |
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[aefcc3b] | 432 | for ( std::list< TypeDecl* >::const_iterator tyvar = type->get_forall().begin(); tyvar != type->get_forall().end(); ++tyvar ) { |
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[a32b204] | 433 | for ( std::list< DeclarationWithType* >::const_iterator assert = (*tyvar)->get_assertions().begin(); assert != (*tyvar)->get_assertions().end(); ++assert ) { |
---|
| 434 | markAssertionSet( assertion1, *assert ); |
---|
| 435 | markAssertionSet( assertion2, *assert ); |
---|
| 436 | } // for |
---|
| 437 | } // for |
---|
| 438 | } |
---|
| 439 | |
---|
[36a2367] | 440 | void Unify::postvisit(PointerType *pointerType) { |
---|
[a32b204] | 441 | if ( PointerType *otherPointer = dynamic_cast< PointerType* >( type2 ) ) { |
---|
| 442 | result = unifyExact( pointerType->get_base(), otherPointer->get_base(), env, needAssertions, haveAssertions, openVars, WidenMode( false, false ), indexer ); |
---|
| 443 | markAssertions( haveAssertions, needAssertions, pointerType ); |
---|
| 444 | markAssertions( haveAssertions, needAssertions, otherPointer ); |
---|
| 445 | } // if |
---|
| 446 | } |
---|
| 447 | |
---|
[36a2367] | 448 | void Unify::postvisit(ReferenceType *refType) { |
---|
[ce8c12f] | 449 | if ( ReferenceType *otherRef = dynamic_cast< ReferenceType* >( type2 ) ) { |
---|
| 450 | result = unifyExact( refType->get_base(), otherRef->get_base(), env, needAssertions, haveAssertions, openVars, WidenMode( false, false ), indexer ); |
---|
| 451 | markAssertions( haveAssertions, needAssertions, refType ); |
---|
| 452 | markAssertions( haveAssertions, needAssertions, otherRef ); |
---|
| 453 | } // if |
---|
| 454 | } |
---|
| 455 | |
---|
[36a2367] | 456 | void Unify::postvisit(ArrayType *arrayType) { |
---|
[a32b204] | 457 | ArrayType *otherArray = dynamic_cast< ArrayType* >( type2 ); |
---|
[1cbca6e] | 458 | // to unify, array types must both be VLA or both not VLA |
---|
| 459 | // and must both have a dimension expression or not have a dimension |
---|
[41a2620] | 460 | if ( otherArray && arrayType->get_isVarLen() == otherArray->get_isVarLen() ) { |
---|
[1cbca6e] | 461 | |
---|
| 462 | if ( ! arrayType->get_isVarLen() && ! otherArray->get_isVarLen() && |
---|
| 463 | arrayType->get_dimension() != 0 && otherArray->get_dimension() != 0 ) { |
---|
| 464 | ConstantExpr * ce1 = dynamic_cast< ConstantExpr * >( arrayType->get_dimension() ); |
---|
| 465 | ConstantExpr * ce2 = dynamic_cast< ConstantExpr * >( otherArray->get_dimension() ); |
---|
[41a2620] | 466 | // see C11 Reference Manual 6.7.6.2.6 |
---|
| 467 | // two array types with size specifiers that are integer constant expressions are |
---|
| 468 | // compatible if both size specifiers have the same constant value |
---|
| 469 | if ( ce1 && ce2 ) { |
---|
| 470 | Constant * c1 = ce1->get_constant(); |
---|
| 471 | Constant * c2 = ce2->get_constant(); |
---|
| 472 | |
---|
| 473 | if ( c1->get_value() != c2->get_value() ) { |
---|
| 474 | // does not unify if the dimension is different |
---|
| 475 | return; |
---|
| 476 | } |
---|
[1cbca6e] | 477 | } |
---|
| 478 | } |
---|
| 479 | |
---|
[a32b204] | 480 | result = unifyExact( arrayType->get_base(), otherArray->get_base(), env, needAssertions, haveAssertions, openVars, WidenMode( false, false ), indexer ); |
---|
| 481 | } // if |
---|
| 482 | } |
---|
| 483 | |
---|
[f3b0a07] | 484 | template< typename Iterator, typename Func > |
---|
| 485 | std::unique_ptr<Type> combineTypes( Iterator begin, Iterator end, Func & toType ) { |
---|
[53e3b4a] | 486 | std::list< Type * > types; |
---|
| 487 | for ( ; begin != end; ++begin ) { |
---|
[64eae56] | 488 | // it's guaranteed that a ttype variable will be bound to a flat tuple, so ensure that this results in a flat tuple |
---|
[f3b0a07] | 489 | flatten( toType( *begin ), back_inserter( types ) ); |
---|
[53e3b4a] | 490 | } |
---|
[6c3a988f] | 491 | return std::unique_ptr<Type>( new TupleType( Type::Qualifiers(), types ) ); |
---|
[53e3b4a] | 492 | } |
---|
| 493 | |
---|
[a32b204] | 494 | template< typename Iterator1, typename Iterator2 > |
---|
| 495 | bool unifyDeclList( Iterator1 list1Begin, Iterator1 list1End, Iterator2 list2Begin, Iterator2 list2End, TypeEnvironment &env, AssertionSet &needAssertions, AssertionSet &haveAssertions, const OpenVarSet &openVars, const SymTab::Indexer &indexer ) { |
---|
[f3b0a07] | 496 | auto get_type = [](DeclarationWithType * dwt){ return dwt->get_type(); }; |
---|
[a32b204] | 497 | for ( ; list1Begin != list1End && list2Begin != list2End; ++list1Begin, ++list2Begin ) { |
---|
[53e3b4a] | 498 | Type * t1 = (*list1Begin)->get_type(); |
---|
| 499 | Type * t2 = (*list2Begin)->get_type(); |
---|
| 500 | bool isTtype1 = Tuples::isTtype( t1 ); |
---|
| 501 | bool isTtype2 = Tuples::isTtype( t2 ); |
---|
[6c3a988f] | 502 | // xxx - assumes ttype must be last parameter |
---|
| 503 | // xxx - there may be a nice way to refactor this, but be careful because the argument positioning might matter in some cases. |
---|
[53e3b4a] | 504 | if ( isTtype1 && ! isTtype2 ) { |
---|
| 505 | // combine all of the things in list2, then unify |
---|
[f3b0a07] | 506 | return unifyExact( t1, combineTypes( list2Begin, list2End, get_type ).get(), env, needAssertions, haveAssertions, openVars, WidenMode( false, false ), indexer ); |
---|
[53e3b4a] | 507 | } else if ( isTtype2 && ! isTtype1 ) { |
---|
| 508 | // combine all of the things in list1, then unify |
---|
[f3b0a07] | 509 | return unifyExact( combineTypes( list1Begin, list1End, get_type ).get(), t2, env, needAssertions, haveAssertions, openVars, WidenMode( false, false ), indexer ); |
---|
[53e3b4a] | 510 | } else if ( ! unifyExact( t1, t2, env, needAssertions, haveAssertions, openVars, WidenMode( false, false ), indexer ) ) { |
---|
[a32b204] | 511 | return false; |
---|
| 512 | } // if |
---|
| 513 | } // for |
---|
[6c3a988f] | 514 | // 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] | 515 | if ( list1Begin != list1End ) { |
---|
| 516 | // try unifying empty tuple type with ttype |
---|
| 517 | Type * t1 = (*list1Begin)->get_type(); |
---|
| 518 | if ( Tuples::isTtype( t1 ) ) { |
---|
[f3b0a07] | 519 | return unifyExact( t1, combineTypes( list2Begin, list2End, get_type ).get(), env, needAssertions, haveAssertions, openVars, WidenMode( false, false ), indexer ); |
---|
[4c8621ac] | 520 | } else return false; |
---|
| 521 | } else if ( list2Begin != list2End ) { |
---|
| 522 | // try unifying empty tuple type with ttype |
---|
| 523 | Type * t2 = (*list2Begin)->get_type(); |
---|
| 524 | if ( Tuples::isTtype( t2 ) ) { |
---|
[f3b0a07] | 525 | return unifyExact( combineTypes( list1Begin, list1End, get_type ).get(), t2, env, needAssertions, haveAssertions, openVars, WidenMode( false, false ), indexer ); |
---|
[4c8621ac] | 526 | } else return false; |
---|
[a32b204] | 527 | } else { |
---|
| 528 | return true; |
---|
| 529 | } // if |
---|
| 530 | } |
---|
| 531 | |
---|
[6c3a988f] | 532 | /// Finds ttypes and replaces them with their expansion, if known. |
---|
| 533 | /// This needs to be done so that satisfying ttype assertions is easier. |
---|
| 534 | /// If this isn't done then argument lists can have wildly different |
---|
| 535 | /// size and structure, when they should be compatible. |
---|
[3096ec1] | 536 | struct TtypeExpander : public WithShortCircuiting { |
---|
| 537 | TypeEnvironment & tenv; |
---|
| 538 | TtypeExpander( TypeEnvironment & tenv ) : tenv( tenv ) {} |
---|
| 539 | void premutate( TypeInstType * ) { visit_children = false; } |
---|
| 540 | Type * postmutate( TypeInstType * typeInst ) { |
---|
[6c3a988f] | 541 | EqvClass eqvClass; |
---|
[3096ec1] | 542 | if ( tenv.lookup( typeInst->get_name(), eqvClass ) ) { |
---|
[6c3a988f] | 543 | if ( eqvClass.data.kind == TypeDecl::Ttype ) { |
---|
| 544 | // expand ttype parameter into its actual type |
---|
| 545 | if ( eqvClass.type ) { |
---|
| 546 | delete typeInst; |
---|
| 547 | return eqvClass.type->clone(); |
---|
| 548 | } |
---|
| 549 | } |
---|
| 550 | } |
---|
| 551 | return typeInst; |
---|
| 552 | } |
---|
| 553 | }; |
---|
| 554 | |
---|
| 555 | /// flattens a list of declarations, so that each tuple type has a single declaration. |
---|
| 556 | /// makes use of TtypeExpander to ensure ttypes are flat as well. |
---|
| 557 | void flattenList( std::list< DeclarationWithType * > src, std::list< DeclarationWithType * > & dst, TypeEnvironment & env ) { |
---|
| 558 | dst.clear(); |
---|
| 559 | for ( DeclarationWithType * dcl : src ) { |
---|
[3096ec1] | 560 | PassVisitor<TtypeExpander> expander( env ); |
---|
[6c3a988f] | 561 | dcl->acceptMutator( expander ); |
---|
| 562 | std::list< Type * > types; |
---|
| 563 | flatten( dcl->get_type(), back_inserter( types ) ); |
---|
| 564 | for ( Type * t : types ) { |
---|
[1dcd52a3] | 565 | // 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. |
---|
| 566 | // 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. |
---|
| 567 | t->get_qualifiers() -= Type::Qualifiers(Type::Const | Type::Volatile | Type::Atomic); |
---|
| 568 | |
---|
[68fe077a] | 569 | dst.push_back( new ObjectDecl( "", Type::StorageClasses(), LinkageSpec::C, nullptr, t, nullptr ) ); |
---|
[6c3a988f] | 570 | } |
---|
| 571 | delete dcl; |
---|
| 572 | } |
---|
| 573 | } |
---|
| 574 | |
---|
[36a2367] | 575 | void Unify::postvisit(FunctionType *functionType) { |
---|
[a32b204] | 576 | FunctionType *otherFunction = dynamic_cast< FunctionType* >( type2 ); |
---|
| 577 | if ( otherFunction && functionType->get_isVarArgs() == otherFunction->get_isVarArgs() ) { |
---|
[6c3a988f] | 578 | // flatten the parameter lists for both functions so that tuple structure |
---|
| 579 | // doesn't affect unification. Must be a clone so that the types don't change. |
---|
| 580 | std::unique_ptr<FunctionType> flatFunc( functionType->clone() ); |
---|
| 581 | std::unique_ptr<FunctionType> flatOther( otherFunction->clone() ); |
---|
| 582 | flattenList( flatFunc->get_parameters(), flatFunc->get_parameters(), env ); |
---|
| 583 | flattenList( flatOther->get_parameters(), flatOther->get_parameters(), env ); |
---|
| 584 | |
---|
[53e3b4a] | 585 | // sizes don't have to match if ttypes are involved; need to be more precise wrt where the ttype is to prevent errors |
---|
[538334a] | 586 | if ( (flatFunc->parameters.size() == flatOther->parameters.size() && flatFunc->returnVals.size() == flatOther->returnVals.size()) || flatFunc->isTtype() || flatOther->isTtype() ) { |
---|
| 587 | if ( unifyDeclList( flatFunc->parameters.begin(), flatFunc->parameters.end(), flatOther->parameters.begin(), flatOther->parameters.end(), env, needAssertions, haveAssertions, openVars, indexer ) ) { |
---|
| 588 | if ( unifyDeclList( flatFunc->returnVals.begin(), flatFunc->returnVals.end(), flatOther->returnVals.begin(), flatOther->returnVals.end(), env, needAssertions, haveAssertions, openVars, indexer ) ) { |
---|
[1cbca6e] | 589 | |
---|
[6c3a988f] | 590 | // the original types must be used in mark assertions, since pointer comparisons are used |
---|
[03da511] | 591 | markAssertions( haveAssertions, needAssertions, functionType ); |
---|
| 592 | markAssertions( haveAssertions, needAssertions, otherFunction ); |
---|
[41a2620] | 593 | |
---|
[03da511] | 594 | result = true; |
---|
| 595 | } // if |
---|
[a32b204] | 596 | } // if |
---|
| 597 | } // if |
---|
| 598 | } // if |
---|
| 599 | } |
---|
| 600 | |
---|
| 601 | template< typename RefType > |
---|
[02ec390] | 602 | void Unify::handleRefType( RefType *inst, Type *other ) { |
---|
| 603 | // check that other type is compatible and named the same |
---|
[a32b204] | 604 | RefType *otherStruct = dynamic_cast< RefType* >( other ); |
---|
[538334a] | 605 | result = otherStruct && inst->name == otherStruct->name; |
---|
[02ec390] | 606 | } |
---|
| 607 | |
---|
| 608 | template< typename RefType > |
---|
| 609 | void Unify::handleGenericRefType( RefType *inst, Type *other ) { |
---|
| 610 | // Check that other type is compatible and named the same |
---|
| 611 | handleRefType( inst, other ); |
---|
| 612 | if ( ! result ) return; |
---|
[f5234f3] | 613 | // Check that parameters of types unify, if any |
---|
[538334a] | 614 | std::list< Expression* > params = inst->parameters; |
---|
| 615 | std::list< Expression* > otherParams = ((RefType*)other)->parameters; |
---|
[f5234f3] | 616 | |
---|
| 617 | std::list< Expression* >::const_iterator it = params.begin(), jt = otherParams.begin(); |
---|
| 618 | for ( ; it != params.end() && jt != otherParams.end(); ++it, ++jt ) { |
---|
| 619 | TypeExpr *param = dynamic_cast< TypeExpr* >(*it); |
---|
[b2daebd4] | 620 | assertf(param, "Aggregate parameters should be type expressions"); |
---|
[f5234f3] | 621 | TypeExpr *otherParam = dynamic_cast< TypeExpr* >(*jt); |
---|
[b2daebd4] | 622 | assertf(otherParam, "Aggregate parameters should be type expressions"); |
---|
[ce8c12f] | 623 | |
---|
[b2daebd4] | 624 | Type* paramTy = param->get_type(); |
---|
| 625 | Type* otherParamTy = otherParam->get_type(); |
---|
[f5234f3] | 626 | |
---|
[b2daebd4] | 627 | bool tupleParam = Tuples::isTtype( paramTy ); |
---|
| 628 | bool otherTupleParam = Tuples::isTtype( otherParamTy ); |
---|
| 629 | |
---|
| 630 | if ( tupleParam && otherTupleParam ) { |
---|
| 631 | ++it; ++jt; // skip ttype parameters for break |
---|
| 632 | } else if ( tupleParam ) { |
---|
| 633 | // bundle other parameters into tuple to match |
---|
[62423350] | 634 | std::list< Type * > binderTypes; |
---|
[b2daebd4] | 635 | |
---|
| 636 | do { |
---|
[62423350] | 637 | binderTypes.push_back( otherParam->get_type()->clone() ); |
---|
[b2daebd4] | 638 | ++jt; |
---|
| 639 | |
---|
| 640 | if ( jt == otherParams.end() ) break; |
---|
| 641 | |
---|
| 642 | otherParam = dynamic_cast< TypeExpr* >(*jt); |
---|
| 643 | assertf(otherParam, "Aggregate parameters should be type expressions"); |
---|
| 644 | } while (true); |
---|
| 645 | |
---|
[62423350] | 646 | otherParamTy = new TupleType{ paramTy->get_qualifiers(), binderTypes }; |
---|
[b2daebd4] | 647 | ++it; // skip ttype parameter for break |
---|
| 648 | } else if ( otherTupleParam ) { |
---|
| 649 | // bundle parameters into tuple to match other |
---|
[62423350] | 650 | std::list< Type * > binderTypes; |
---|
[b2daebd4] | 651 | |
---|
| 652 | do { |
---|
[62423350] | 653 | binderTypes.push_back( param->get_type()->clone() ); |
---|
[b2daebd4] | 654 | ++it; |
---|
| 655 | |
---|
| 656 | if ( it == params.end() ) break; |
---|
| 657 | |
---|
| 658 | param = dynamic_cast< TypeExpr* >(*it); |
---|
| 659 | assertf(param, "Aggregate parameters should be type expressions"); |
---|
| 660 | } while (true); |
---|
| 661 | |
---|
[62423350] | 662 | paramTy = new TupleType{ otherParamTy->get_qualifiers(), binderTypes }; |
---|
[b2daebd4] | 663 | ++jt; // skip ttype parameter for break |
---|
| 664 | } |
---|
| 665 | |
---|
| 666 | if ( ! unifyExact( paramTy, otherParamTy, env, needAssertions, haveAssertions, openVars, WidenMode(false, false), indexer ) ) { |
---|
[02ec390] | 667 | result = false; |
---|
| 668 | return; |
---|
| 669 | } |
---|
[b2daebd4] | 670 | |
---|
| 671 | // ttype parameter should be last |
---|
| 672 | if ( tupleParam || otherTupleParam ) break; |
---|
[02ec390] | 673 | } |
---|
[f5234f3] | 674 | result = ( it == params.end() && jt == otherParams.end() ); |
---|
[02ec390] | 675 | } |
---|
[a32b204] | 676 | |
---|
[36a2367] | 677 | void Unify::postvisit(StructInstType *structInst) { |
---|
[02ec390] | 678 | handleGenericRefType( structInst, type2 ); |
---|
[a32b204] | 679 | } |
---|
| 680 | |
---|
[36a2367] | 681 | void Unify::postvisit(UnionInstType *unionInst) { |
---|
[02ec390] | 682 | handleGenericRefType( unionInst, type2 ); |
---|
[a32b204] | 683 | } |
---|
| 684 | |
---|
[36a2367] | 685 | void Unify::postvisit(EnumInstType *enumInst) { |
---|
[a32b204] | 686 | handleRefType( enumInst, type2 ); |
---|
| 687 | } |
---|
| 688 | |
---|
[36a2367] | 689 | void Unify::postvisit(TraitInstType *contextInst) { |
---|
[a32b204] | 690 | handleRefType( contextInst, type2 ); |
---|
| 691 | } |
---|
| 692 | |
---|
[36a2367] | 693 | void Unify::postvisit(TypeInstType *typeInst) { |
---|
[a32b204] | 694 | assert( openVars.find( typeInst->get_name() ) == openVars.end() ); |
---|
| 695 | TypeInstType *otherInst = dynamic_cast< TypeInstType* >( type2 ); |
---|
| 696 | if ( otherInst && typeInst->get_name() == otherInst->get_name() ) { |
---|
| 697 | result = true; |
---|
[51b7345] | 698 | /// } else { |
---|
| 699 | /// NamedTypeDecl *nt = indexer.lookupType( typeInst->get_name() ); |
---|
[a32b204] | 700 | /// if ( nt ) { |
---|
[51b7345] | 701 | /// TypeDecl *type = dynamic_cast< TypeDecl* >( nt ); |
---|
| 702 | /// assert( type ); |
---|
[a32b204] | 703 | /// if ( type->get_base() ) { |
---|
[51b7345] | 704 | /// result = unifyExact( type->get_base(), typeInst, env, needAssertions, haveAssertions, openVars, WidenMode( false, false ), indexer ); |
---|
| 705 | /// } |
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| 706 | /// } |
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[a32b204] | 707 | } // if |
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| 708 | } |
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| 709 | |
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| 710 | template< typename Iterator1, typename Iterator2 > |
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[c77fd8b] | 711 | 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] | 712 | auto get_type = [](Type * t) { return t; }; |
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[a32b204] | 713 | for ( ; list1Begin != list1End && list2Begin != list2End; ++list1Begin, ++list2Begin ) { |
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[f3b0a07] | 714 | Type * t1 = *list1Begin; |
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| 715 | Type * t2 = *list2Begin; |
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| 716 | bool isTtype1 = Tuples::isTtype( t1 ); |
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| 717 | bool isTtype2 = Tuples::isTtype( t2 ); |
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| 718 | // xxx - assumes ttype must be last parameter |
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| 719 | // 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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| 720 | if ( isTtype1 && ! isTtype2 ) { |
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| 721 | // combine all of the things in list2, then unify |
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| 722 | return unifyExact( t1, combineTypes( list2Begin, list2End, get_type ).get(), env, needAssertions, haveAssertions, openVars, WidenMode( false, false ), indexer ); |
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| 723 | } else if ( isTtype2 && ! isTtype1 ) { |
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| 724 | // combine all of the things in list1, then unify |
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| 725 | return unifyExact( combineTypes( list1Begin, list1End, get_type ).get(), t2, env, needAssertions, haveAssertions, openVars, WidenMode( false, false ), indexer ); |
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| 726 | } else if ( ! unifyExact( t1, t2, env, needAssertions, haveAssertions, openVars, WidenMode( false, false ), indexer ) ) { |
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[a32b204] | 727 | return false; |
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[f3b0a07] | 728 | } // if |
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| 729 | |
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[a32b204] | 730 | } // for |
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[f3b0a07] | 731 | if ( list1Begin != list1End ) { |
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| 732 | // try unifying empty tuple type with ttype |
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| 733 | Type * t1 = *list1Begin; |
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| 734 | if ( Tuples::isTtype( t1 ) ) { |
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| 735 | return unifyExact( t1, combineTypes( list2Begin, list2End, get_type ).get(), env, needAssertions, haveAssertions, openVars, WidenMode( false, false ), indexer ); |
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| 736 | } else return false; |
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| 737 | } else if ( list2Begin != list2End ) { |
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| 738 | // try unifying empty tuple type with ttype |
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| 739 | Type * t2 = *list2Begin; |
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| 740 | if ( Tuples::isTtype( t2 ) ) { |
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| 741 | return unifyExact( combineTypes( list1Begin, list1End, get_type ).get(), t2, env, needAssertions, haveAssertions, openVars, WidenMode( false, false ), indexer ); |
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| 742 | } else return false; |
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[a32b204] | 743 | } else { |
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| 744 | return true; |
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[f3b0a07] | 745 | } // if |
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[a32b204] | 746 | } |
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| 747 | |
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[36a2367] | 748 | void Unify::postvisit(TupleType *tupleType) { |
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[a32b204] | 749 | if ( TupleType *otherTuple = dynamic_cast< TupleType* >( type2 ) ) { |
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[f3b0a07] | 750 | std::unique_ptr<TupleType> flat1( tupleType->clone() ); |
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| 751 | std::unique_ptr<TupleType> flat2( otherTuple->clone() ); |
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| 752 | std::list<Type *> types1, types2; |
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| 753 | |
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[3096ec1] | 754 | PassVisitor<TtypeExpander> expander( env ); |
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[f3b0a07] | 755 | flat1->acceptMutator( expander ); |
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| 756 | flat2->acceptMutator( expander ); |
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| 757 | |
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| 758 | flatten( flat1.get(), back_inserter( types1 ) ); |
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| 759 | flatten( flat2.get(), back_inserter( types2 ) ); |
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| 760 | |
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[c77fd8b] | 761 | result = unifyList( types1.begin(), types1.end(), types2.begin(), types2.end(), env, needAssertions, haveAssertions, openVars, indexer ); |
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[a32b204] | 762 | } // if |
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| 763 | } |
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[51b7345] | 764 | |
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[36a2367] | 765 | void Unify::postvisit( __attribute__((unused)) VarArgsType *varArgsType ) { |
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[44b7088] | 766 | result = dynamic_cast< VarArgsType* >( type2 ); |
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| 767 | } |
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| 768 | |
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[36a2367] | 769 | void Unify::postvisit( __attribute__((unused)) ZeroType *zeroType ) { |
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[89e6ffc] | 770 | result = dynamic_cast< ZeroType* >( type2 ); |
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| 771 | } |
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| 772 | |
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[36a2367] | 773 | void Unify::postvisit( __attribute__((unused)) OneType *oneType ) { |
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[89e6ffc] | 774 | result = dynamic_cast< OneType* >( type2 ); |
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| 775 | } |
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| 776 | |
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[906e24d] | 777 | // xxx - compute once and store in the FunctionType? |
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| 778 | Type * extractResultType( FunctionType * function ) { |
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| 779 | if ( function->get_returnVals().size() == 0 ) { |
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| 780 | return new VoidType( Type::Qualifiers() ); |
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| 781 | } else if ( function->get_returnVals().size() == 1 ) { |
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| 782 | return function->get_returnVals().front()->get_type()->clone(); |
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| 783 | } else { |
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[62423350] | 784 | std::list< Type * > types; |
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[906e24d] | 785 | for ( DeclarationWithType * decl : function->get_returnVals() ) { |
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[62423350] | 786 | types.push_back( decl->get_type()->clone() ); |
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[906e24d] | 787 | } // for |
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[62423350] | 788 | return new TupleType( Type::Qualifiers(), types ); |
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[906e24d] | 789 | } |
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| 790 | } |
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[51b7345] | 791 | } // namespace ResolvExpr |
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[a32b204] | 792 | |
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| 793 | // Local Variables: // |
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| 794 | // tab-width: 4 // |
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| 795 | // mode: c++ // |
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| 796 | // compile-command: "make install" // |
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| 797 | // End: // |
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