[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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[07de76b] | 11 | // Last Modified By : Peter A. Buhr |
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| 12 | // Last Modified On : Fri Dec 13 23:43:05 2019 |
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| 13 | // Update Count : 46 |
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[a32b204] | 14 | // |
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[51b7345] | 15 | |
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[f474e91] | 16 | #include "Unify.h" |
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| 17 | |
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[d76c588] | 18 | #include <cassert> // for assertf, assert |
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| 19 | #include <iterator> // for back_insert_iterator, back_inserter |
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| 20 | #include <map> // for _Rb_tree_const_iterator, _Rb_tree_i... |
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| 21 | #include <memory> // for unique_ptr |
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| 22 | #include <set> // for set |
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| 23 | #include <string> // for string, operator==, operator!=, bas... |
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| 24 | #include <utility> // for pair, move |
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[54e41b3] | 25 | #include <vector> |
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[51b7345] | 26 | |
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[2890212] | 27 | #include "AST/Copy.hpp" |
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[f474e91] | 28 | #include "AST/Decl.hpp" |
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[54e41b3] | 29 | #include "AST/Node.hpp" |
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[f474e91] | 30 | #include "AST/Pass.hpp" |
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[2890212] | 31 | #include "AST/Print.hpp" |
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[54e41b3] | 32 | #include "AST/Type.hpp" |
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[d76c588] | 33 | #include "AST/TypeEnvironment.hpp" |
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| 34 | #include "Common/PassVisitor.h" // for PassVisitor |
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| 35 | #include "FindOpenVars.h" // for findOpenVars |
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[07de76b] | 36 | #include "SynTree/LinkageSpec.h" // for C |
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[d76c588] | 37 | #include "SynTree/Constant.h" // for Constant |
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| 38 | #include "SynTree/Declaration.h" // for TypeDecl, TypeDecl::Data, Declarati... |
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| 39 | #include "SynTree/Expression.h" // for TypeExpr, Expression, ConstantExpr |
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| 40 | #include "SynTree/Mutator.h" // for Mutator |
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| 41 | #include "SynTree/Type.h" // for Type, TypeInstType, FunctionType |
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| 42 | #include "SynTree/Visitor.h" // for Visitor |
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| 43 | #include "Tuples/Tuples.h" // for isTtype |
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| 44 | #include "TypeEnvironment.h" // for EqvClass, AssertionSet, OpenVarSet |
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| 45 | #include "typeops.h" // for flatten, occurs, commonType |
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[ea6332d] | 46 | |
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[f474e91] | 47 | namespace ast { |
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| 48 | class SymbolTable; |
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| 49 | } |
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| 50 | |
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[ea6332d] | 51 | namespace SymTab { |
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| 52 | class Indexer; |
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| 53 | } // namespace SymTab |
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[51b7345] | 54 | |
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[1cbca6e] | 55 | // #define DEBUG |
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[51b7345] | 56 | |
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| 57 | namespace ResolvExpr { |
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| 58 | |
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[f474e91] | 59 | struct Unify_old : public WithShortCircuiting { |
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| 60 | Unify_old( Type *type2, TypeEnvironment &env, AssertionSet &needAssertions, AssertionSet &haveAssertions, const OpenVarSet &openVars, WidenMode widen, const SymTab::Indexer &indexer ); |
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[41a2620] | 61 | |
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[a32b204] | 62 | bool get_result() const { return result; } |
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| 63 | |
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[36a2367] | 64 | void previsit( BaseSyntaxNode * ) { visit_children = false; } |
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| 65 | |
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| 66 | void postvisit( VoidType * voidType ); |
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| 67 | void postvisit( BasicType * basicType ); |
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| 68 | void postvisit( PointerType * pointerType ); |
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| 69 | void postvisit( ArrayType * arrayType ); |
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| 70 | void postvisit( ReferenceType * refType ); |
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| 71 | void postvisit( FunctionType * functionType ); |
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| 72 | void postvisit( StructInstType * aggregateUseType ); |
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| 73 | void postvisit( UnionInstType * aggregateUseType ); |
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| 74 | void postvisit( EnumInstType * aggregateUseType ); |
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| 75 | void postvisit( TraitInstType * aggregateUseType ); |
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| 76 | void postvisit( TypeInstType * aggregateUseType ); |
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| 77 | void postvisit( TupleType * tupleType ); |
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| 78 | void postvisit( VarArgsType * varArgsType ); |
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| 79 | void postvisit( ZeroType * zeroType ); |
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| 80 | void postvisit( OneType * oneType ); |
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| 81 | |
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| 82 | private: |
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[a32b204] | 83 | template< typename RefType > void handleRefType( RefType *inst, Type *other ); |
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[02ec390] | 84 | template< typename RefType > void handleGenericRefType( RefType *inst, Type *other ); |
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[a32b204] | 85 | |
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| 86 | bool result; |
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| 87 | Type *type2; // inherited |
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| 88 | TypeEnvironment &env; |
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| 89 | AssertionSet &needAssertions; |
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| 90 | AssertionSet &haveAssertions; |
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| 91 | const OpenVarSet &openVars; |
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[f474e91] | 92 | WidenMode widen; |
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[a32b204] | 93 | const SymTab::Indexer &indexer; |
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| 94 | }; |
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| 95 | |
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[eb50842] | 96 | /// Attempts an inexact unification of type1 and type2. |
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| 97 | /// 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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[f474e91] | 98 | bool unifyInexact( Type *type1, Type *type2, TypeEnvironment &env, AssertionSet &needAssertions, AssertionSet &haveAssertions, const OpenVarSet &openVars, WidenMode widen, const SymTab::Indexer &indexer, Type *&common ); |
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| 99 | bool unifyExact( Type *type1, Type *type2, TypeEnvironment &env, AssertionSet &needAssertions, AssertionSet &haveAssertions, const OpenVarSet &openVars, WidenMode widen, const SymTab::Indexer &indexer ); |
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| 100 | |
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[7870799] | 101 | bool unifyExact( |
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| 102 | const ast::Type * type1, const ast::Type * type2, ast::TypeEnvironment & env, |
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| 103 | ast::AssertionSet & need, ast::AssertionSet & have, const ast::OpenVarSet & open, |
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[f474e91] | 104 | WidenMode widen, const ast::SymbolTable & symtab ); |
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[41a2620] | 105 | |
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[6f096d2] | 106 | bool typesCompatible( const Type * first, const Type * second, const SymTab::Indexer & indexer, const TypeEnvironment & env ) { |
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[a32b204] | 107 | TypeEnvironment newEnv; |
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[1cbca6e] | 108 | OpenVarSet openVars, closedVars; // added closedVars |
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[a32b204] | 109 | AssertionSet needAssertions, haveAssertions; |
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[6f096d2] | 110 | Type * newFirst = first->clone(), * newSecond = second->clone(); |
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[a32b204] | 111 | env.apply( newFirst ); |
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| 112 | env.apply( newSecond ); |
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[1cbca6e] | 113 | |
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| 114 | // do we need to do this? Seems like we do, types should be able to be compatible if they |
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| 115 | // have free variables that can unify |
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| 116 | findOpenVars( newFirst, openVars, closedVars, needAssertions, haveAssertions, false ); |
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| 117 | findOpenVars( newSecond, openVars, closedVars, needAssertions, haveAssertions, true ); |
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| 118 | |
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[a32b204] | 119 | bool result = unifyExact( newFirst, newSecond, newEnv, needAssertions, haveAssertions, openVars, WidenMode( false, false ), indexer ); |
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| 120 | delete newFirst; |
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| 121 | delete newSecond; |
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| 122 | return result; |
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| 123 | } |
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| 124 | |
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[7870799] | 125 | bool typesCompatible( |
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| 126 | const ast::Type * first, const ast::Type * second, const ast::SymbolTable & symtab, |
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[d76c588] | 127 | const ast::TypeEnvironment & env ) { |
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[f474e91] | 128 | ast::TypeEnvironment newEnv; |
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| 129 | ast::OpenVarSet open, closed; |
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| 130 | ast::AssertionSet need, have; |
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| 131 | |
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| 132 | ast::ptr<ast::Type> newFirst{ first }, newSecond{ second }; |
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| 133 | env.apply( newFirst ); |
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| 134 | env.apply( newSecond ); |
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| 135 | |
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| 136 | findOpenVars( newFirst, open, closed, need, have, FirstClosed ); |
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| 137 | findOpenVars( newSecond, open, closed, need, have, FirstOpen ); |
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| 138 | |
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[2890212] | 139 | return unifyExact(newFirst, newSecond, newEnv, need, have, open, noWiden(), symtab ); |
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[d76c588] | 140 | } |
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| 141 | |
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[7870799] | 142 | bool typesCompatibleIgnoreQualifiers( const Type * first, const Type * second, const SymTab::Indexer &indexer, const TypeEnvironment &env ) { |
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[a32b204] | 143 | TypeEnvironment newEnv; |
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| 144 | OpenVarSet openVars; |
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| 145 | AssertionSet needAssertions, haveAssertions; |
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| 146 | Type *newFirst = first->clone(), *newSecond = second->clone(); |
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| 147 | env.apply( newFirst ); |
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| 148 | env.apply( newSecond ); |
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| 149 | newFirst->get_qualifiers() = Type::Qualifiers(); |
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| 150 | newSecond->get_qualifiers() = Type::Qualifiers(); |
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[2890212] | 151 | |
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[a32b204] | 152 | bool result = unifyExact( newFirst, newSecond, newEnv, needAssertions, haveAssertions, openVars, WidenMode( false, false ), indexer ); |
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| 153 | delete newFirst; |
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| 154 | delete newSecond; |
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| 155 | return result; |
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| 156 | } |
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| 157 | |
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[7870799] | 158 | bool typesCompatibleIgnoreQualifiers( |
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| 159 | const ast::Type * first, const ast::Type * second, const ast::SymbolTable & symtab, |
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[d76c588] | 160 | const ast::TypeEnvironment & env ) { |
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[f474e91] | 161 | ast::TypeEnvironment newEnv; |
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| 162 | ast::OpenVarSet open; |
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| 163 | ast::AssertionSet need, have; |
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[7870799] | 164 | |
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[2890212] | 165 | ast::Type * newFirst = shallowCopy( first ); |
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| 166 | ast::Type * newSecond = shallowCopy( second ); |
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[b729c01] | 167 | if ( auto temp = dynamic_cast<const ast::EnumInstType *>(first) ) { |
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| 168 | if ( !dynamic_cast< const ast::EnumInstType * >( second ) ) { |
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| 169 | const ast::EnumDecl * baseEnum = dynamic_cast<const ast::EnumDecl *>(temp->base.get()); |
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| 170 | if ( auto t = baseEnum->base.get() ) { |
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| 171 | newFirst = ast::shallowCopy( t ); |
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| 172 | } |
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| 173 | } |
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| 174 | } else if ( auto temp = dynamic_cast<const ast::EnumInstType *>(second) ) { |
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| 175 | const ast::EnumDecl * baseEnum = dynamic_cast<const ast::EnumDecl *>(temp->base.get()); |
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| 176 | if ( auto t = baseEnum->base.get() ) { |
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| 177 | newSecond = ast::shallowCopy( t ); |
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| 178 | } |
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| 179 | } |
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| 180 | |
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[2890212] | 181 | newFirst ->qualifiers = {}; |
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| 182 | newSecond->qualifiers = {}; |
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[f49b3fc] | 183 | ast::ptr< ast::Type > t1_(newFirst ); |
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| 184 | ast::ptr< ast::Type > t2_(newSecond); |
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[f474e91] | 185 | |
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[c7f834e] | 186 | ast::ptr< ast::Type > subFirst = env.apply(newFirst).node; |
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| 187 | ast::ptr< ast::Type > subSecond = env.apply(newSecond).node; |
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| 188 | |
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[7870799] | 189 | return unifyExact( |
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[c7f834e] | 190 | subFirst, |
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| 191 | subSecond, |
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[2890212] | 192 | newEnv, need, have, open, noWiden(), symtab ); |
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[d76c588] | 193 | } |
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| 194 | |
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[a32b204] | 195 | bool unify( Type *type1, Type *type2, TypeEnvironment &env, AssertionSet &needAssertions, AssertionSet &haveAssertions, OpenVarSet &openVars, const SymTab::Indexer &indexer ) { |
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| 196 | OpenVarSet closedVars; |
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| 197 | findOpenVars( type1, openVars, closedVars, needAssertions, haveAssertions, false ); |
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| 198 | findOpenVars( type2, openVars, closedVars, needAssertions, haveAssertions, true ); |
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| 199 | Type *commonType = 0; |
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| 200 | if ( unifyInexact( type1, type2, env, needAssertions, haveAssertions, openVars, WidenMode( true, true ), indexer, commonType ) ) { |
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| 201 | if ( commonType ) { |
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| 202 | delete commonType; |
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| 203 | } // if |
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| 204 | return true; |
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| 205 | } else { |
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| 206 | return false; |
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| 207 | } // if |
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| 208 | } |
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| 209 | |
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| 210 | bool unify( Type *type1, Type *type2, TypeEnvironment &env, AssertionSet &needAssertions, AssertionSet &haveAssertions, OpenVarSet &openVars, const SymTab::Indexer &indexer, Type *&commonType ) { |
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| 211 | OpenVarSet closedVars; |
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| 212 | findOpenVars( type1, openVars, closedVars, needAssertions, haveAssertions, false ); |
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| 213 | findOpenVars( type2, openVars, closedVars, needAssertions, haveAssertions, true ); |
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| 214 | return unifyInexact( type1, type2, env, needAssertions, haveAssertions, openVars, WidenMode( true, true ), indexer, commonType ); |
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| 215 | } |
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| 216 | |
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[f474e91] | 217 | bool unifyExact( Type *type1, Type *type2, TypeEnvironment &env, AssertionSet &needAssertions, AssertionSet &haveAssertions, const OpenVarSet &openVars, WidenMode widen, const SymTab::Indexer &indexer ) { |
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[51b7345] | 218 | #ifdef DEBUG |
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[a32b204] | 219 | TypeEnvironment debugEnv( env ); |
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[51b7345] | 220 | #endif |
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[eb50842] | 221 | if ( type1->get_qualifiers() != type2->get_qualifiers() ) { |
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| 222 | return false; |
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| 223 | } |
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| 224 | |
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[a32b204] | 225 | bool result; |
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| 226 | TypeInstType *var1 = dynamic_cast< TypeInstType* >( type1 ); |
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| 227 | TypeInstType *var2 = dynamic_cast< TypeInstType* >( type2 ); |
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| 228 | OpenVarSet::const_iterator entry1, entry2; |
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| 229 | if ( var1 ) { |
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| 230 | entry1 = openVars.find( var1->get_name() ); |
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| 231 | } // if |
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| 232 | if ( var2 ) { |
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| 233 | entry2 = openVars.find( var2->get_name() ); |
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| 234 | } // if |
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| 235 | bool isopen1 = var1 && ( entry1 != openVars.end() ); |
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| 236 | bool isopen2 = var2 && ( entry2 != openVars.end() ); |
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[eb50842] | 237 | |
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[7a63486] | 238 | if ( isopen1 && isopen2 ) { |
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| 239 | if ( entry1->second.kind != entry2->second.kind ) { |
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| 240 | result = false; |
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| 241 | } else { |
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[4139e3d] | 242 | result = env.bindVarToVar( |
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| 243 | var1, var2, TypeDecl::Data{ entry1->second, entry2->second }, needAssertions, |
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[f474e91] | 244 | haveAssertions, openVars, widen, indexer ); |
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[7a63486] | 245 | } |
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[a32b204] | 246 | } else if ( isopen1 ) { |
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[f474e91] | 247 | result = env.bindVar( var1, type2, entry1->second, needAssertions, haveAssertions, openVars, widen, indexer ); |
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| 248 | } else if ( isopen2 ) { // TODO: swap widen values in call, since type positions are flipped? |
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| 249 | result = env.bindVar( var2, type1, entry2->second, needAssertions, haveAssertions, openVars, widen, indexer ); |
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[a32b204] | 250 | } else { |
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[f474e91] | 251 | PassVisitor<Unify_old> comparator( type2, env, needAssertions, haveAssertions, openVars, widen, indexer ); |
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[a32b204] | 252 | type1->accept( comparator ); |
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[36a2367] | 253 | result = comparator.pass.get_result(); |
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[a32b204] | 254 | } // if |
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[51b7345] | 255 | #ifdef DEBUG |
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[2c57025] | 256 | std::cerr << "============ unifyExact" << std::endl; |
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| 257 | std::cerr << "type1 is "; |
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| 258 | type1->print( std::cerr ); |
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| 259 | std::cerr << std::endl << "type2 is "; |
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| 260 | type2->print( std::cerr ); |
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| 261 | std::cerr << std::endl << "openVars are "; |
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| 262 | printOpenVarSet( openVars, std::cerr, 8 ); |
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| 263 | std::cerr << std::endl << "input env is " << std::endl; |
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| 264 | debugEnv.print( std::cerr, 8 ); |
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| 265 | std::cerr << std::endl << "result env is " << std::endl; |
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| 266 | env.print( std::cerr, 8 ); |
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| 267 | std::cerr << "result is " << result << std::endl; |
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[51b7345] | 268 | #endif |
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[a32b204] | 269 | return result; |
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| 270 | } |
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| 271 | |
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| 272 | bool unifyExact( Type *type1, Type *type2, TypeEnvironment &env, AssertionSet &needAssertions, AssertionSet &haveAssertions, OpenVarSet &openVars, const SymTab::Indexer &indexer ) { |
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| 273 | return unifyExact( type1, type2, env, needAssertions, haveAssertions, openVars, WidenMode( false, false ), indexer ); |
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| 274 | } |
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| 275 | |
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[f474e91] | 276 | bool unifyInexact( Type *type1, Type *type2, TypeEnvironment &env, AssertionSet &needAssertions, AssertionSet &haveAssertions, const OpenVarSet &openVars, WidenMode widen, const SymTab::Indexer &indexer, Type *&common ) { |
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[a32b204] | 277 | Type::Qualifiers tq1 = type1->get_qualifiers(), tq2 = type2->get_qualifiers(); |
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| 278 | type1->get_qualifiers() = Type::Qualifiers(); |
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| 279 | type2->get_qualifiers() = Type::Qualifiers(); |
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| 280 | bool result; |
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[51b7345] | 281 | #ifdef DEBUG |
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[2c57025] | 282 | std::cerr << "unifyInexact type 1 is "; |
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| 283 | type1->print( std::cerr ); |
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[0b150ec] | 284 | std::cerr << " type 2 is "; |
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[2c57025] | 285 | type2->print( std::cerr ); |
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| 286 | std::cerr << std::endl; |
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[51b7345] | 287 | #endif |
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[f474e91] | 288 | if ( ! unifyExact( type1, type2, env, needAssertions, haveAssertions, openVars, widen, indexer ) ) { |
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[51b7345] | 289 | #ifdef DEBUG |
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[2c57025] | 290 | std::cerr << "unifyInexact: no exact unification found" << std::endl; |
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[51b7345] | 291 | #endif |
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[f474e91] | 292 | if ( ( common = commonType( type1, type2, widen.first, widen.second, indexer, env, openVars ) ) ) { |
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[3315e3d] | 293 | common->tq = tq1.unify( tq2 ); |
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[51b7345] | 294 | #ifdef DEBUG |
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[2c57025] | 295 | std::cerr << "unifyInexact: common type is "; |
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| 296 | common->print( std::cerr ); |
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| 297 | std::cerr << std::endl; |
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[51b7345] | 298 | #endif |
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[a32b204] | 299 | result = true; |
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| 300 | } else { |
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[51b7345] | 301 | #ifdef DEBUG |
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[2c57025] | 302 | std::cerr << "unifyInexact: no common type found" << std::endl; |
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[51b7345] | 303 | #endif |
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[a32b204] | 304 | result = false; |
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| 305 | } // if |
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| 306 | } else { |
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| 307 | if ( tq1 != tq2 ) { |
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[f474e91] | 308 | if ( ( tq1 > tq2 || widen.first ) && ( tq2 > tq1 || widen.second ) ) { |
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[a32b204] | 309 | common = type1->clone(); |
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[3315e3d] | 310 | common->tq = tq1.unify( tq2 ); |
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[a32b204] | 311 | result = true; |
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| 312 | } else { |
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| 313 | result = false; |
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| 314 | } // if |
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| 315 | } else { |
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[e6cee92] | 316 | common = type1->clone(); |
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[3315e3d] | 317 | common->tq = tq1.unify( tq2 ); |
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[a32b204] | 318 | result = true; |
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| 319 | } // if |
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| 320 | } // if |
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| 321 | type1->get_qualifiers() = tq1; |
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| 322 | type2->get_qualifiers() = tq2; |
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| 323 | return result; |
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| 324 | } |
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| 325 | |
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[f474e91] | 326 | Unify_old::Unify_old( Type *type2, TypeEnvironment &env, AssertionSet &needAssertions, AssertionSet &haveAssertions, const OpenVarSet &openVars, WidenMode widen, const SymTab::Indexer &indexer ) |
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| 327 | : result( false ), type2( type2 ), env( env ), needAssertions( needAssertions ), haveAssertions( haveAssertions ), openVars( openVars ), widen( widen ), indexer( indexer ) { |
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[d76c588] | 328 | } |
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| 329 | |
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[f474e91] | 330 | void Unify_old::postvisit( __attribute__((unused)) VoidType *voidType) { |
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[a32b204] | 331 | result = dynamic_cast< VoidType* >( type2 ); |
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| 332 | } |
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| 333 | |
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[f474e91] | 334 | void Unify_old::postvisit(BasicType *basicType) { |
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[a32b204] | 335 | if ( BasicType *otherBasic = dynamic_cast< BasicType* >( type2 ) ) { |
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| 336 | result = basicType->get_kind() == otherBasic->get_kind(); |
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| 337 | } // if |
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| 338 | } |
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| 339 | |
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| 340 | void markAssertionSet( AssertionSet &assertions, DeclarationWithType *assert ) { |
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| 341 | AssertionSet::iterator i = assertions.find( assert ); |
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| 342 | if ( i != assertions.end() ) { |
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[6c3a988f] | 343 | i->second.isUsed = true; |
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[a32b204] | 344 | } // if |
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| 345 | } |
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| 346 | |
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| 347 | void markAssertions( AssertionSet &assertion1, AssertionSet &assertion2, Type *type ) { |
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[aefcc3b] | 348 | for ( std::list< TypeDecl* >::const_iterator tyvar = type->get_forall().begin(); tyvar != type->get_forall().end(); ++tyvar ) { |
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[a32b204] | 349 | for ( std::list< DeclarationWithType* >::const_iterator assert = (*tyvar)->get_assertions().begin(); assert != (*tyvar)->get_assertions().end(); ++assert ) { |
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| 350 | markAssertionSet( assertion1, *assert ); |
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| 351 | markAssertionSet( assertion2, *assert ); |
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| 352 | } // for |
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| 353 | } // for |
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| 354 | } |
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| 355 | |
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[f474e91] | 356 | void Unify_old::postvisit(PointerType *pointerType) { |
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[a32b204] | 357 | if ( PointerType *otherPointer = dynamic_cast< PointerType* >( type2 ) ) { |
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| 358 | result = unifyExact( pointerType->get_base(), otherPointer->get_base(), env, needAssertions, haveAssertions, openVars, WidenMode( false, false ), indexer ); |
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| 359 | markAssertions( haveAssertions, needAssertions, pointerType ); |
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| 360 | markAssertions( haveAssertions, needAssertions, otherPointer ); |
---|
| 361 | } // if |
---|
| 362 | } |
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| 363 | |
---|
[f474e91] | 364 | void Unify_old::postvisit(ReferenceType *refType) { |
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[ce8c12f] | 365 | if ( ReferenceType *otherRef = dynamic_cast< ReferenceType* >( type2 ) ) { |
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| 366 | result = unifyExact( refType->get_base(), otherRef->get_base(), env, needAssertions, haveAssertions, openVars, WidenMode( false, false ), indexer ); |
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| 367 | markAssertions( haveAssertions, needAssertions, refType ); |
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| 368 | markAssertions( haveAssertions, needAssertions, otherRef ); |
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| 369 | } // if |
---|
| 370 | } |
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| 371 | |
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[f474e91] | 372 | void Unify_old::postvisit(ArrayType *arrayType) { |
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[a32b204] | 373 | ArrayType *otherArray = dynamic_cast< ArrayType* >( type2 ); |
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[1cbca6e] | 374 | // to unify, array types must both be VLA or both not VLA |
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| 375 | // and must both have a dimension expression or not have a dimension |
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[41a2620] | 376 | if ( otherArray && arrayType->get_isVarLen() == otherArray->get_isVarLen() ) { |
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[1cbca6e] | 377 | |
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| 378 | if ( ! arrayType->get_isVarLen() && ! otherArray->get_isVarLen() && |
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| 379 | arrayType->get_dimension() != 0 && otherArray->get_dimension() != 0 ) { |
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| 380 | ConstantExpr * ce1 = dynamic_cast< ConstantExpr * >( arrayType->get_dimension() ); |
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| 381 | ConstantExpr * ce2 = dynamic_cast< ConstantExpr * >( otherArray->get_dimension() ); |
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[41a2620] | 382 | // see C11 Reference Manual 6.7.6.2.6 |
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| 383 | // two array types with size specifiers that are integer constant expressions are |
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| 384 | // compatible if both size specifiers have the same constant value |
---|
| 385 | if ( ce1 && ce2 ) { |
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| 386 | Constant * c1 = ce1->get_constant(); |
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| 387 | Constant * c2 = ce2->get_constant(); |
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| 388 | |
---|
| 389 | if ( c1->get_value() != c2->get_value() ) { |
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| 390 | // does not unify if the dimension is different |
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| 391 | return; |
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| 392 | } |
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[1cbca6e] | 393 | } |
---|
| 394 | } |
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| 395 | |
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[a32b204] | 396 | result = unifyExact( arrayType->get_base(), otherArray->get_base(), env, needAssertions, haveAssertions, openVars, WidenMode( false, false ), indexer ); |
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| 397 | } // if |
---|
| 398 | } |
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| 399 | |
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[f3b0a07] | 400 | template< typename Iterator, typename Func > |
---|
| 401 | std::unique_ptr<Type> combineTypes( Iterator begin, Iterator end, Func & toType ) { |
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[53e3b4a] | 402 | std::list< Type * > types; |
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| 403 | for ( ; begin != end; ++begin ) { |
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[64eae56] | 404 | // it's guaranteed that a ttype variable will be bound to a flat tuple, so ensure that this results in a flat tuple |
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[f3b0a07] | 405 | flatten( toType( *begin ), back_inserter( types ) ); |
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[53e3b4a] | 406 | } |
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[6c3a988f] | 407 | return std::unique_ptr<Type>( new TupleType( Type::Qualifiers(), types ) ); |
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[53e3b4a] | 408 | } |
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| 409 | |
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[a32b204] | 410 | template< typename Iterator1, typename Iterator2 > |
---|
[954c954] | 411 | bool unifyTypeList( 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] | 412 | auto get_type = [](DeclarationWithType * dwt){ return dwt->get_type(); }; |
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[a32b204] | 413 | for ( ; list1Begin != list1End && list2Begin != list2End; ++list1Begin, ++list2Begin ) { |
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[53e3b4a] | 414 | Type * t1 = (*list1Begin)->get_type(); |
---|
| 415 | Type * t2 = (*list2Begin)->get_type(); |
---|
| 416 | bool isTtype1 = Tuples::isTtype( t1 ); |
---|
| 417 | bool isTtype2 = Tuples::isTtype( t2 ); |
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[6c3a988f] | 418 | // xxx - assumes ttype must be last parameter |
---|
| 419 | // xxx - there may be a nice way to refactor this, but be careful because the argument positioning might matter in some cases. |
---|
[53e3b4a] | 420 | if ( isTtype1 && ! isTtype2 ) { |
---|
| 421 | // combine all of the things in list2, then unify |
---|
[f3b0a07] | 422 | return unifyExact( t1, combineTypes( list2Begin, list2End, get_type ).get(), env, needAssertions, haveAssertions, openVars, WidenMode( false, false ), indexer ); |
---|
[53e3b4a] | 423 | } else if ( isTtype2 && ! isTtype1 ) { |
---|
| 424 | // combine all of the things in list1, then unify |
---|
[f3b0a07] | 425 | return unifyExact( combineTypes( list1Begin, list1End, get_type ).get(), t2, env, needAssertions, haveAssertions, openVars, WidenMode( false, false ), indexer ); |
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[53e3b4a] | 426 | } else if ( ! unifyExact( t1, t2, env, needAssertions, haveAssertions, openVars, WidenMode( false, false ), indexer ) ) { |
---|
[a32b204] | 427 | return false; |
---|
| 428 | } // if |
---|
| 429 | } // for |
---|
[6c3a988f] | 430 | // 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] | 431 | if ( list1Begin != list1End ) { |
---|
| 432 | // try unifying empty tuple type with ttype |
---|
| 433 | Type * t1 = (*list1Begin)->get_type(); |
---|
| 434 | if ( Tuples::isTtype( t1 ) ) { |
---|
[f3b0a07] | 435 | return unifyExact( t1, combineTypes( list2Begin, list2End, get_type ).get(), env, needAssertions, haveAssertions, openVars, WidenMode( false, false ), indexer ); |
---|
[4c8621ac] | 436 | } else return false; |
---|
| 437 | } else if ( list2Begin != list2End ) { |
---|
| 438 | // try unifying empty tuple type with ttype |
---|
| 439 | Type * t2 = (*list2Begin)->get_type(); |
---|
| 440 | if ( Tuples::isTtype( t2 ) ) { |
---|
[f3b0a07] | 441 | return unifyExact( combineTypes( list1Begin, list1End, get_type ).get(), t2, env, needAssertions, haveAssertions, openVars, WidenMode( false, false ), indexer ); |
---|
[4c8621ac] | 442 | } else return false; |
---|
[a32b204] | 443 | } else { |
---|
| 444 | return true; |
---|
| 445 | } // if |
---|
| 446 | } |
---|
| 447 | |
---|
[6c3a988f] | 448 | /// Finds ttypes and replaces them with their expansion, if known. |
---|
| 449 | /// This needs to be done so that satisfying ttype assertions is easier. |
---|
| 450 | /// If this isn't done then argument lists can have wildly different |
---|
| 451 | /// size and structure, when they should be compatible. |
---|
[f474e91] | 452 | struct TtypeExpander_old : public WithShortCircuiting { |
---|
[3096ec1] | 453 | TypeEnvironment & tenv; |
---|
[f474e91] | 454 | TtypeExpander_old( TypeEnvironment & tenv ) : tenv( tenv ) {} |
---|
[3096ec1] | 455 | void premutate( TypeInstType * ) { visit_children = false; } |
---|
| 456 | Type * postmutate( TypeInstType * typeInst ) { |
---|
[00ac42e] | 457 | if ( const EqvClass *eqvClass = tenv.lookup( typeInst->get_name() ) ) { |
---|
| 458 | // expand ttype parameter into its actual type |
---|
| 459 | if ( eqvClass->data.kind == TypeDecl::Ttype && eqvClass->type ) { |
---|
| 460 | delete typeInst; |
---|
| 461 | return eqvClass->type->clone(); |
---|
[6c3a988f] | 462 | } |
---|
| 463 | } |
---|
| 464 | return typeInst; |
---|
| 465 | } |
---|
| 466 | }; |
---|
| 467 | |
---|
| 468 | /// flattens a list of declarations, so that each tuple type has a single declaration. |
---|
| 469 | /// makes use of TtypeExpander to ensure ttypes are flat as well. |
---|
| 470 | void flattenList( std::list< DeclarationWithType * > src, std::list< DeclarationWithType * > & dst, TypeEnvironment & env ) { |
---|
| 471 | dst.clear(); |
---|
| 472 | for ( DeclarationWithType * dcl : src ) { |
---|
[f474e91] | 473 | PassVisitor<TtypeExpander_old> expander( env ); |
---|
[6c3a988f] | 474 | dcl->acceptMutator( expander ); |
---|
| 475 | std::list< Type * > types; |
---|
| 476 | flatten( dcl->get_type(), back_inserter( types ) ); |
---|
| 477 | for ( Type * t : types ) { |
---|
[1dcd52a3] | 478 | // 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. |
---|
| 479 | // 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. |
---|
| 480 | t->get_qualifiers() -= Type::Qualifiers(Type::Const | Type::Volatile | Type::Atomic); |
---|
| 481 | |
---|
[68fe077a] | 482 | dst.push_back( new ObjectDecl( "", Type::StorageClasses(), LinkageSpec::C, nullptr, t, nullptr ) ); |
---|
[6c3a988f] | 483 | } |
---|
| 484 | delete dcl; |
---|
| 485 | } |
---|
| 486 | } |
---|
| 487 | |
---|
[f474e91] | 488 | void Unify_old::postvisit(FunctionType *functionType) { |
---|
[a32b204] | 489 | FunctionType *otherFunction = dynamic_cast< FunctionType* >( type2 ); |
---|
| 490 | if ( otherFunction && functionType->get_isVarArgs() == otherFunction->get_isVarArgs() ) { |
---|
[6c3a988f] | 491 | // flatten the parameter lists for both functions so that tuple structure |
---|
| 492 | // doesn't affect unification. Must be a clone so that the types don't change. |
---|
| 493 | std::unique_ptr<FunctionType> flatFunc( functionType->clone() ); |
---|
| 494 | std::unique_ptr<FunctionType> flatOther( otherFunction->clone() ); |
---|
| 495 | flattenList( flatFunc->get_parameters(), flatFunc->get_parameters(), env ); |
---|
| 496 | flattenList( flatOther->get_parameters(), flatOther->get_parameters(), env ); |
---|
| 497 | |
---|
[53e3b4a] | 498 | // sizes don't have to match if ttypes are involved; need to be more precise wrt where the ttype is to prevent errors |
---|
[7870799] | 499 | if ( |
---|
| 500 | (flatFunc->parameters.size() == flatOther->parameters.size() && |
---|
| 501 | flatFunc->returnVals.size() == flatOther->returnVals.size()) |
---|
| 502 | || flatFunc->isTtype() |
---|
| 503 | || flatOther->isTtype() |
---|
[f474e91] | 504 | ) { |
---|
[954c954] | 505 | if ( unifyTypeList( flatFunc->parameters.begin(), flatFunc->parameters.end(), flatOther->parameters.begin(), flatOther->parameters.end(), env, needAssertions, haveAssertions, openVars, indexer ) ) { |
---|
| 506 | if ( unifyTypeList( flatFunc->returnVals.begin(), flatFunc->returnVals.end(), flatOther->returnVals.begin(), flatOther->returnVals.end(), env, needAssertions, haveAssertions, openVars, indexer ) ) { |
---|
[1cbca6e] | 507 | |
---|
[6c3a988f] | 508 | // the original types must be used in mark assertions, since pointer comparisons are used |
---|
[03da511] | 509 | markAssertions( haveAssertions, needAssertions, functionType ); |
---|
| 510 | markAssertions( haveAssertions, needAssertions, otherFunction ); |
---|
[41a2620] | 511 | |
---|
[03da511] | 512 | result = true; |
---|
| 513 | } // if |
---|
[a32b204] | 514 | } // if |
---|
| 515 | } // if |
---|
| 516 | } // if |
---|
| 517 | } |
---|
| 518 | |
---|
| 519 | template< typename RefType > |
---|
[f474e91] | 520 | void Unify_old::handleRefType( RefType *inst, Type *other ) { |
---|
[02ec390] | 521 | // check that other type is compatible and named the same |
---|
[a32b204] | 522 | RefType *otherStruct = dynamic_cast< RefType* >( other ); |
---|
[538334a] | 523 | result = otherStruct && inst->name == otherStruct->name; |
---|
[02ec390] | 524 | } |
---|
| 525 | |
---|
| 526 | template< typename RefType > |
---|
[f474e91] | 527 | void Unify_old::handleGenericRefType( RefType *inst, Type *other ) { |
---|
[02ec390] | 528 | // Check that other type is compatible and named the same |
---|
| 529 | handleRefType( inst, other ); |
---|
| 530 | if ( ! result ) return; |
---|
[f5234f3] | 531 | // Check that parameters of types unify, if any |
---|
[538334a] | 532 | std::list< Expression* > params = inst->parameters; |
---|
| 533 | std::list< Expression* > otherParams = ((RefType*)other)->parameters; |
---|
[f5234f3] | 534 | |
---|
| 535 | std::list< Expression* >::const_iterator it = params.begin(), jt = otherParams.begin(); |
---|
| 536 | for ( ; it != params.end() && jt != otherParams.end(); ++it, ++jt ) { |
---|
| 537 | TypeExpr *param = dynamic_cast< TypeExpr* >(*it); |
---|
[b2daebd4] | 538 | assertf(param, "Aggregate parameters should be type expressions"); |
---|
[f5234f3] | 539 | TypeExpr *otherParam = dynamic_cast< TypeExpr* >(*jt); |
---|
[b2daebd4] | 540 | assertf(otherParam, "Aggregate parameters should be type expressions"); |
---|
[ce8c12f] | 541 | |
---|
[b2daebd4] | 542 | Type* paramTy = param->get_type(); |
---|
| 543 | Type* otherParamTy = otherParam->get_type(); |
---|
[f5234f3] | 544 | |
---|
[b2daebd4] | 545 | bool tupleParam = Tuples::isTtype( paramTy ); |
---|
| 546 | bool otherTupleParam = Tuples::isTtype( otherParamTy ); |
---|
| 547 | |
---|
| 548 | if ( tupleParam && otherTupleParam ) { |
---|
| 549 | ++it; ++jt; // skip ttype parameters for break |
---|
| 550 | } else if ( tupleParam ) { |
---|
| 551 | // bundle other parameters into tuple to match |
---|
[62423350] | 552 | std::list< Type * > binderTypes; |
---|
[b2daebd4] | 553 | |
---|
| 554 | do { |
---|
[62423350] | 555 | binderTypes.push_back( otherParam->get_type()->clone() ); |
---|
[b2daebd4] | 556 | ++jt; |
---|
| 557 | |
---|
| 558 | if ( jt == otherParams.end() ) break; |
---|
| 559 | |
---|
| 560 | otherParam = dynamic_cast< TypeExpr* >(*jt); |
---|
| 561 | assertf(otherParam, "Aggregate parameters should be type expressions"); |
---|
| 562 | } while (true); |
---|
| 563 | |
---|
[62423350] | 564 | otherParamTy = new TupleType{ paramTy->get_qualifiers(), binderTypes }; |
---|
[b2daebd4] | 565 | ++it; // skip ttype parameter for break |
---|
| 566 | } else if ( otherTupleParam ) { |
---|
| 567 | // bundle parameters into tuple to match other |
---|
[62423350] | 568 | std::list< Type * > binderTypes; |
---|
[b2daebd4] | 569 | |
---|
| 570 | do { |
---|
[62423350] | 571 | binderTypes.push_back( param->get_type()->clone() ); |
---|
[b2daebd4] | 572 | ++it; |
---|
| 573 | |
---|
| 574 | if ( it == params.end() ) break; |
---|
| 575 | |
---|
| 576 | param = dynamic_cast< TypeExpr* >(*it); |
---|
| 577 | assertf(param, "Aggregate parameters should be type expressions"); |
---|
| 578 | } while (true); |
---|
| 579 | |
---|
[62423350] | 580 | paramTy = new TupleType{ otherParamTy->get_qualifiers(), binderTypes }; |
---|
[b2daebd4] | 581 | ++jt; // skip ttype parameter for break |
---|
| 582 | } |
---|
| 583 | |
---|
| 584 | if ( ! unifyExact( paramTy, otherParamTy, env, needAssertions, haveAssertions, openVars, WidenMode(false, false), indexer ) ) { |
---|
[02ec390] | 585 | result = false; |
---|
| 586 | return; |
---|
| 587 | } |
---|
[b2daebd4] | 588 | |
---|
| 589 | // ttype parameter should be last |
---|
| 590 | if ( tupleParam || otherTupleParam ) break; |
---|
[02ec390] | 591 | } |
---|
[f5234f3] | 592 | result = ( it == params.end() && jt == otherParams.end() ); |
---|
[02ec390] | 593 | } |
---|
[a32b204] | 594 | |
---|
[f474e91] | 595 | void Unify_old::postvisit(StructInstType *structInst) { |
---|
[02ec390] | 596 | handleGenericRefType( structInst, type2 ); |
---|
[a32b204] | 597 | } |
---|
| 598 | |
---|
[f474e91] | 599 | void Unify_old::postvisit(UnionInstType *unionInst) { |
---|
[02ec390] | 600 | handleGenericRefType( unionInst, type2 ); |
---|
[a32b204] | 601 | } |
---|
| 602 | |
---|
[f474e91] | 603 | void Unify_old::postvisit(EnumInstType *enumInst) { |
---|
[a32b204] | 604 | handleRefType( enumInst, type2 ); |
---|
| 605 | } |
---|
| 606 | |
---|
[f474e91] | 607 | void Unify_old::postvisit(TraitInstType *contextInst) { |
---|
[a32b204] | 608 | handleRefType( contextInst, type2 ); |
---|
| 609 | } |
---|
| 610 | |
---|
[f474e91] | 611 | void Unify_old::postvisit(TypeInstType *typeInst) { |
---|
[a32b204] | 612 | assert( openVars.find( typeInst->get_name() ) == openVars.end() ); |
---|
| 613 | TypeInstType *otherInst = dynamic_cast< TypeInstType* >( type2 ); |
---|
| 614 | if ( otherInst && typeInst->get_name() == otherInst->get_name() ) { |
---|
| 615 | result = true; |
---|
[51b7345] | 616 | /// } else { |
---|
| 617 | /// NamedTypeDecl *nt = indexer.lookupType( typeInst->get_name() ); |
---|
[a32b204] | 618 | /// if ( nt ) { |
---|
[51b7345] | 619 | /// TypeDecl *type = dynamic_cast< TypeDecl* >( nt ); |
---|
| 620 | /// assert( type ); |
---|
[a32b204] | 621 | /// if ( type->get_base() ) { |
---|
[51b7345] | 622 | /// result = unifyExact( type->get_base(), typeInst, env, needAssertions, haveAssertions, openVars, WidenMode( false, false ), indexer ); |
---|
| 623 | /// } |
---|
| 624 | /// } |
---|
[a32b204] | 625 | } // if |
---|
| 626 | } |
---|
| 627 | |
---|
| 628 | template< typename Iterator1, typename Iterator2 > |
---|
[c77fd8b] | 629 | bool unifyList( Iterator1 list1Begin, Iterator1 list1End, Iterator2 list2Begin, Iterator2 list2End, TypeEnvironment &env, AssertionSet &needAssertions, AssertionSet &haveAssertions, const OpenVarSet &openVars, const SymTab::Indexer &indexer ) { |
---|
[f3b0a07] | 630 | auto get_type = [](Type * t) { return t; }; |
---|
[a32b204] | 631 | for ( ; list1Begin != list1End && list2Begin != list2End; ++list1Begin, ++list2Begin ) { |
---|
[f3b0a07] | 632 | Type * t1 = *list1Begin; |
---|
| 633 | Type * t2 = *list2Begin; |
---|
| 634 | bool isTtype1 = Tuples::isTtype( t1 ); |
---|
| 635 | bool isTtype2 = Tuples::isTtype( t2 ); |
---|
| 636 | // xxx - assumes ttype must be last parameter |
---|
| 637 | // xxx - there may be a nice way to refactor this, but be careful because the argument positioning might matter in some cases. |
---|
| 638 | if ( isTtype1 && ! isTtype2 ) { |
---|
| 639 | // combine all of the things in list2, then unify |
---|
| 640 | return unifyExact( t1, combineTypes( list2Begin, list2End, get_type ).get(), env, needAssertions, haveAssertions, openVars, WidenMode( false, false ), indexer ); |
---|
| 641 | } else if ( isTtype2 && ! isTtype1 ) { |
---|
| 642 | // combine all of the things in list1, then unify |
---|
| 643 | return unifyExact( combineTypes( list1Begin, list1End, get_type ).get(), t2, env, needAssertions, haveAssertions, openVars, WidenMode( false, false ), indexer ); |
---|
| 644 | } else if ( ! unifyExact( t1, t2, env, needAssertions, haveAssertions, openVars, WidenMode( false, false ), indexer ) ) { |
---|
[a32b204] | 645 | return false; |
---|
[f3b0a07] | 646 | } // if |
---|
| 647 | |
---|
[a32b204] | 648 | } // for |
---|
[f3b0a07] | 649 | if ( list1Begin != list1End ) { |
---|
| 650 | // try unifying empty tuple type with ttype |
---|
| 651 | Type * t1 = *list1Begin; |
---|
| 652 | if ( Tuples::isTtype( t1 ) ) { |
---|
| 653 | return unifyExact( t1, combineTypes( list2Begin, list2End, get_type ).get(), env, needAssertions, haveAssertions, openVars, WidenMode( false, false ), indexer ); |
---|
| 654 | } else return false; |
---|
| 655 | } else if ( list2Begin != list2End ) { |
---|
| 656 | // try unifying empty tuple type with ttype |
---|
| 657 | Type * t2 = *list2Begin; |
---|
| 658 | if ( Tuples::isTtype( t2 ) ) { |
---|
| 659 | return unifyExact( combineTypes( list1Begin, list1End, get_type ).get(), t2, env, needAssertions, haveAssertions, openVars, WidenMode( false, false ), indexer ); |
---|
| 660 | } else return false; |
---|
[a32b204] | 661 | } else { |
---|
| 662 | return true; |
---|
[f3b0a07] | 663 | } // if |
---|
[a32b204] | 664 | } |
---|
| 665 | |
---|
[f474e91] | 666 | void Unify_old::postvisit(TupleType *tupleType) { |
---|
[a32b204] | 667 | if ( TupleType *otherTuple = dynamic_cast< TupleType* >( type2 ) ) { |
---|
[f3b0a07] | 668 | std::unique_ptr<TupleType> flat1( tupleType->clone() ); |
---|
| 669 | std::unique_ptr<TupleType> flat2( otherTuple->clone() ); |
---|
| 670 | std::list<Type *> types1, types2; |
---|
| 671 | |
---|
[f474e91] | 672 | PassVisitor<TtypeExpander_old> expander( env ); |
---|
[f3b0a07] | 673 | flat1->acceptMutator( expander ); |
---|
| 674 | flat2->acceptMutator( expander ); |
---|
| 675 | |
---|
| 676 | flatten( flat1.get(), back_inserter( types1 ) ); |
---|
| 677 | flatten( flat2.get(), back_inserter( types2 ) ); |
---|
| 678 | |
---|
[c77fd8b] | 679 | result = unifyList( types1.begin(), types1.end(), types2.begin(), types2.end(), env, needAssertions, haveAssertions, openVars, indexer ); |
---|
[a32b204] | 680 | } // if |
---|
| 681 | } |
---|
[51b7345] | 682 | |
---|
[f474e91] | 683 | void Unify_old::postvisit( __attribute__((unused)) VarArgsType *varArgsType ) { |
---|
[44b7088] | 684 | result = dynamic_cast< VarArgsType* >( type2 ); |
---|
| 685 | } |
---|
| 686 | |
---|
[f474e91] | 687 | void Unify_old::postvisit( __attribute__((unused)) ZeroType *zeroType ) { |
---|
[89e6ffc] | 688 | result = dynamic_cast< ZeroType* >( type2 ); |
---|
| 689 | } |
---|
| 690 | |
---|
[f474e91] | 691 | void Unify_old::postvisit( __attribute__((unused)) OneType *oneType ) { |
---|
[89e6ffc] | 692 | result = dynamic_cast< OneType* >( type2 ); |
---|
| 693 | } |
---|
| 694 | |
---|
[906e24d] | 695 | Type * extractResultType( FunctionType * function ) { |
---|
| 696 | if ( function->get_returnVals().size() == 0 ) { |
---|
| 697 | return new VoidType( Type::Qualifiers() ); |
---|
| 698 | } else if ( function->get_returnVals().size() == 1 ) { |
---|
| 699 | return function->get_returnVals().front()->get_type()->clone(); |
---|
| 700 | } else { |
---|
[62423350] | 701 | std::list< Type * > types; |
---|
[906e24d] | 702 | for ( DeclarationWithType * decl : function->get_returnVals() ) { |
---|
[62423350] | 703 | types.push_back( decl->get_type()->clone() ); |
---|
[906e24d] | 704 | } // for |
---|
[62423350] | 705 | return new TupleType( Type::Qualifiers(), types ); |
---|
[906e24d] | 706 | } |
---|
| 707 | } |
---|
[54e41b3] | 708 | |
---|
[ef1da0e2] | 709 | namespace { |
---|
| 710 | /// Replaces ttype variables with their bound types. |
---|
| 711 | /// If this isn't done when satifying ttype assertions, then argument lists can have |
---|
| 712 | /// different size and structure when they should be compatible. |
---|
| 713 | struct TtypeExpander_new : public ast::WithShortCircuiting, public ast::PureVisitor { |
---|
| 714 | ast::TypeEnvironment & tenv; |
---|
| 715 | |
---|
| 716 | TtypeExpander_new( ast::TypeEnvironment & env ) : tenv( env ) {} |
---|
| 717 | |
---|
| 718 | const ast::Type * postvisit( const ast::TypeInstType * typeInst ) { |
---|
| 719 | if ( const ast::EqvClass * clz = tenv.lookup( *typeInst ) ) { |
---|
| 720 | // expand ttype parameter into its actual type |
---|
| 721 | if ( clz->data.kind == ast::TypeDecl::Ttype && clz->bound ) { |
---|
| 722 | return clz->bound; |
---|
| 723 | } |
---|
| 724 | } |
---|
| 725 | return typeInst; |
---|
| 726 | } |
---|
| 727 | }; |
---|
| 728 | } |
---|
| 729 | |
---|
| 730 | std::vector< ast::ptr< ast::Type > > flattenList( |
---|
| 731 | const std::vector< ast::ptr< ast::Type > > & src, ast::TypeEnvironment & env |
---|
| 732 | ) { |
---|
| 733 | std::vector< ast::ptr< ast::Type > > dst; |
---|
| 734 | dst.reserve( src.size() ); |
---|
| 735 | for ( const auto & d : src ) { |
---|
| 736 | ast::Pass<TtypeExpander_new> expander{ env }; |
---|
| 737 | // TtypeExpander pass is impure (may mutate nodes in place) |
---|
| 738 | // need to make nodes shared to prevent accidental mutation |
---|
| 739 | ast::ptr<ast::Type> dc = d->accept(expander); |
---|
| 740 | auto types = flatten( dc ); |
---|
| 741 | for ( ast::ptr< ast::Type > & t : types ) { |
---|
| 742 | // outermost const, volatile, _Atomic qualifiers in parameters should not play |
---|
| 743 | // a role in the unification of function types, since they do not determine |
---|
| 744 | // whether a function is callable. |
---|
| 745 | // NOTE: **must** consider at least mutex qualifier, since functions can be |
---|
| 746 | // overloaded on outermost mutex and a mutex function has different |
---|
| 747 | // requirements than a non-mutex function |
---|
| 748 | remove_qualifiers( t, ast::CV::Const | ast::CV::Volatile | ast::CV::Atomic ); |
---|
| 749 | dst.emplace_back( t ); |
---|
| 750 | } |
---|
| 751 | } |
---|
| 752 | return dst; |
---|
| 753 | } |
---|
| 754 | |
---|
[ee574a2] | 755 | class Unify_new final : public ast::WithShortCircuiting { |
---|
[f474e91] | 756 | const ast::Type * type2; |
---|
| 757 | ast::TypeEnvironment & tenv; |
---|
| 758 | ast::AssertionSet & need; |
---|
| 759 | ast::AssertionSet & have; |
---|
| 760 | const ast::OpenVarSet & open; |
---|
| 761 | WidenMode widen; |
---|
| 762 | const ast::SymbolTable & symtab; |
---|
| 763 | public: |
---|
[c15085d] | 764 | static size_t traceId; |
---|
[f474e91] | 765 | bool result; |
---|
| 766 | |
---|
[7870799] | 767 | Unify_new( |
---|
| 768 | const ast::Type * type2, ast::TypeEnvironment & env, ast::AssertionSet & need, |
---|
| 769 | ast::AssertionSet & have, const ast::OpenVarSet & open, WidenMode widen, |
---|
[f474e91] | 770 | const ast::SymbolTable & symtab ) |
---|
[7870799] | 771 | : type2(type2), tenv(env), need(need), have(have), open(open), widen(widen), |
---|
[f474e91] | 772 | symtab(symtab), result(false) {} |
---|
| 773 | |
---|
| 774 | void previsit( const ast::Node * ) { visit_children = false; } |
---|
[7870799] | 775 | |
---|
[ee574a2] | 776 | void postvisit( const ast::VoidType * ) { |
---|
[f474e91] | 777 | result = dynamic_cast< const ast::VoidType * >( type2 ); |
---|
| 778 | } |
---|
| 779 | |
---|
[ee574a2] | 780 | void postvisit( const ast::BasicType * basic ) { |
---|
[f474e91] | 781 | if ( auto basic2 = dynamic_cast< const ast::BasicType * >( type2 ) ) { |
---|
| 782 | result = basic->kind == basic2->kind; |
---|
| 783 | } |
---|
| 784 | } |
---|
| 785 | |
---|
[ee574a2] | 786 | void postvisit( const ast::PointerType * pointer ) { |
---|
[f474e91] | 787 | if ( auto pointer2 = dynamic_cast< const ast::PointerType * >( type2 ) ) { |
---|
[7870799] | 788 | result = unifyExact( |
---|
| 789 | pointer->base, pointer2->base, tenv, need, have, open, |
---|
[ee574a2] | 790 | noWiden(), symtab ); |
---|
[f474e91] | 791 | } |
---|
| 792 | } |
---|
| 793 | |
---|
[ee574a2] | 794 | void postvisit( const ast::ArrayType * array ) { |
---|
[f474e91] | 795 | auto array2 = dynamic_cast< const ast::ArrayType * >( type2 ); |
---|
| 796 | if ( ! array2 ) return; |
---|
| 797 | |
---|
[7870799] | 798 | // to unify, array types must both be VLA or both not VLA and both must have a |
---|
[f474e91] | 799 | // dimension expression or not have a dimension |
---|
| 800 | if ( array->isVarLen != array2->isVarLen ) return; |
---|
[7870799] | 801 | if ( ! array->isVarLen && ! array2->isVarLen |
---|
[f474e91] | 802 | && array->dimension && array2->dimension ) { |
---|
| 803 | auto ce1 = array->dimension.as< ast::ConstantExpr >(); |
---|
| 804 | auto ce2 = array2->dimension.as< ast::ConstantExpr >(); |
---|
| 805 | |
---|
| 806 | // see C11 Reference Manual 6.7.6.2.6 |
---|
[7870799] | 807 | // two array types with size specifiers that are integer constant expressions are |
---|
[f474e91] | 808 | // compatible if both size specifiers have the same constant value |
---|
| 809 | if ( ce1 && ce2 && ce1->intValue() != ce2->intValue() ) return; |
---|
| 810 | } |
---|
| 811 | |
---|
[7870799] | 812 | result = unifyExact( |
---|
| 813 | array->base, array2->base, tenv, need, have, open, noWiden(), |
---|
[f474e91] | 814 | symtab ); |
---|
| 815 | } |
---|
| 816 | |
---|
[ee574a2] | 817 | void postvisit( const ast::ReferenceType * ref ) { |
---|
[f474e91] | 818 | if ( auto ref2 = dynamic_cast< const ast::ReferenceType * >( type2 ) ) { |
---|
[7870799] | 819 | result = unifyExact( |
---|
| 820 | ref->base, ref2->base, tenv, need, have, open, noWiden(), |
---|
[f474e91] | 821 | symtab ); |
---|
| 822 | } |
---|
| 823 | } |
---|
| 824 | |
---|
| 825 | private: |
---|
| 826 | |
---|
| 827 | template< typename Iter > |
---|
[954c954] | 828 | static bool unifyTypeList( |
---|
[7870799] | 829 | Iter crnt1, Iter end1, Iter crnt2, Iter end2, ast::TypeEnvironment & env, |
---|
| 830 | ast::AssertionSet & need, ast::AssertionSet & have, const ast::OpenVarSet & open, |
---|
[f474e91] | 831 | const ast::SymbolTable & symtab |
---|
| 832 | ) { |
---|
| 833 | while ( crnt1 != end1 && crnt2 != end2 ) { |
---|
[954c954] | 834 | const ast::Type * t1 = *crnt1; |
---|
| 835 | const ast::Type * t2 = *crnt2; |
---|
[f474e91] | 836 | bool isTuple1 = Tuples::isTtype( t1 ); |
---|
| 837 | bool isTuple2 = Tuples::isTtype( t2 ); |
---|
| 838 | |
---|
| 839 | // assumes here that ttype *must* be last parameter |
---|
| 840 | if ( isTuple1 && ! isTuple2 ) { |
---|
| 841 | // combine remainder of list2, then unify |
---|
[7870799] | 842 | return unifyExact( |
---|
[954c954] | 843 | t1, tupleFromTypes( crnt2, end2 ), env, need, have, open, |
---|
[ee574a2] | 844 | noWiden(), symtab ); |
---|
[f474e91] | 845 | } else if ( ! isTuple1 && isTuple2 ) { |
---|
| 846 | // combine remainder of list1, then unify |
---|
[7870799] | 847 | return unifyExact( |
---|
[954c954] | 848 | tupleFromTypes( crnt1, end1 ), t2, env, need, have, open, |
---|
[ee574a2] | 849 | noWiden(), symtab ); |
---|
[f474e91] | 850 | } |
---|
| 851 | |
---|
[7870799] | 852 | if ( ! unifyExact( |
---|
| 853 | t1, t2, env, need, have, open, noWiden(), symtab ) |
---|
[f474e91] | 854 | ) return false; |
---|
| 855 | |
---|
| 856 | ++crnt1; ++crnt2; |
---|
| 857 | } |
---|
| 858 | |
---|
[7870799] | 859 | // May get to the end of one argument list before the other. This is only okay if the |
---|
[f474e91] | 860 | // other is a ttype |
---|
| 861 | if ( crnt1 != end1 ) { |
---|
| 862 | // try unifying empty tuple with ttype |
---|
[954c954] | 863 | const ast::Type * t1 = *crnt1; |
---|
[f474e91] | 864 | if ( ! Tuples::isTtype( t1 ) ) return false; |
---|
[7870799] | 865 | return unifyExact( |
---|
[954c954] | 866 | t1, tupleFromTypes( crnt2, end2 ), env, need, have, open, |
---|
[ee574a2] | 867 | noWiden(), symtab ); |
---|
[f474e91] | 868 | } else if ( crnt2 != end2 ) { |
---|
| 869 | // try unifying empty tuple with ttype |
---|
[954c954] | 870 | const ast::Type * t2 = *crnt2; |
---|
[f474e91] | 871 | if ( ! Tuples::isTtype( t2 ) ) return false; |
---|
[7870799] | 872 | return unifyExact( |
---|
[954c954] | 873 | tupleFromTypes( crnt1, end1 ), t2, env, need, have, open, |
---|
[ee574a2] | 874 | noWiden(), symtab ); |
---|
[f474e91] | 875 | } |
---|
| 876 | |
---|
| 877 | return true; |
---|
| 878 | } |
---|
| 879 | |
---|
[954c954] | 880 | static bool unifyTypeList( |
---|
| 881 | const std::vector< ast::ptr< ast::Type > > & list1, |
---|
| 882 | const std::vector< ast::ptr< ast::Type > > & list2, |
---|
[7870799] | 883 | ast::TypeEnvironment & env, ast::AssertionSet & need, ast::AssertionSet & have, |
---|
[f474e91] | 884 | const ast::OpenVarSet & open, const ast::SymbolTable & symtab |
---|
| 885 | ) { |
---|
[954c954] | 886 | return unifyTypeList( |
---|
[7870799] | 887 | list1.begin(), list1.end(), list2.begin(), list2.end(), env, need, have, open, |
---|
[f474e91] | 888 | symtab ); |
---|
| 889 | } |
---|
| 890 | |
---|
[3e5dd913] | 891 | static void markAssertionSet( ast::AssertionSet & assns, const ast::VariableExpr * assn ) { |
---|
[f474e91] | 892 | auto i = assns.find( assn ); |
---|
| 893 | if ( i != assns.end() ) { |
---|
| 894 | i->second.isUsed = true; |
---|
| 895 | } |
---|
| 896 | } |
---|
| 897 | |
---|
| 898 | /// mark all assertions in `type` used in both `assn1` and `assn2` |
---|
[7870799] | 899 | static void markAssertions( |
---|
| 900 | ast::AssertionSet & assn1, ast::AssertionSet & assn2, |
---|
[361bf01] | 901 | const ast::FunctionType * type |
---|
[f474e91] | 902 | ) { |
---|
[3e5dd913] | 903 | for ( auto & assert : type->assertions ) { |
---|
| 904 | markAssertionSet( assn1, assert ); |
---|
| 905 | markAssertionSet( assn2, assert ); |
---|
[f474e91] | 906 | } |
---|
| 907 | } |
---|
| 908 | |
---|
| 909 | public: |
---|
[ee574a2] | 910 | void postvisit( const ast::FunctionType * func ) { |
---|
[f474e91] | 911 | auto func2 = dynamic_cast< const ast::FunctionType * >( type2 ); |
---|
| 912 | if ( ! func2 ) return; |
---|
| 913 | |
---|
| 914 | if ( func->isVarArgs != func2->isVarArgs ) return; |
---|
[7870799] | 915 | |
---|
| 916 | // Flatten the parameter lists for both functions so that tuple structure does not |
---|
[f474e91] | 917 | // affect unification. Does not actually mutate function parameters. |
---|
| 918 | auto params = flattenList( func->params, tenv ); |
---|
| 919 | auto params2 = flattenList( func2->params, tenv ); |
---|
| 920 | |
---|
[7870799] | 921 | // sizes don't have to match if ttypes are involved; need to be more precise w.r.t. |
---|
[f474e91] | 922 | // where the ttype is to prevent errors |
---|
[7870799] | 923 | if ( |
---|
[f474e91] | 924 | ( params.size() != params2.size() || func->returns.size() != func2->returns.size() ) |
---|
| 925 | && ! func->isTtype() |
---|
| 926 | && ! func2->isTtype() |
---|
| 927 | ) return; |
---|
| 928 | |
---|
[954c954] | 929 | if ( ! unifyTypeList( params, params2, tenv, need, have, open, symtab ) ) return; |
---|
| 930 | if ( ! unifyTypeList( |
---|
[f474e91] | 931 | func->returns, func2->returns, tenv, need, have, open, symtab ) ) return; |
---|
[7870799] | 932 | |
---|
[f474e91] | 933 | markAssertions( have, need, func ); |
---|
| 934 | markAssertions( have, need, func2 ); |
---|
| 935 | |
---|
| 936 | result = true; |
---|
| 937 | } |
---|
[7870799] | 938 | |
---|
[f474e91] | 939 | private: |
---|
[90ce35aa] | 940 | // Returns: other, cast as XInstType |
---|
| 941 | // Assigns this->result: whether types are compatible (up to generic parameters) |
---|
| 942 | template< typename XInstType > |
---|
| 943 | const XInstType * handleRefType( const XInstType * inst, const ast::Type * other ) { |
---|
[f474e91] | 944 | // check that the other type is compatible and named the same |
---|
[90ce35aa] | 945 | auto otherInst = dynamic_cast< const XInstType * >( other ); |
---|
[9d8124f] | 946 | if (otherInst && inst->name == otherInst->name) this->result = otherInst; |
---|
[f474e91] | 947 | return otherInst; |
---|
| 948 | } |
---|
| 949 | |
---|
| 950 | /// Creates a tuple type based on a list of TypeExpr |
---|
| 951 | template< typename Iter > |
---|
[7870799] | 952 | static const ast::Type * tupleFromExprs( |
---|
[f474e91] | 953 | const ast::TypeExpr * param, Iter & crnt, Iter end, ast::CV::Qualifiers qs |
---|
| 954 | ) { |
---|
| 955 | std::vector< ast::ptr< ast::Type > > types; |
---|
| 956 | do { |
---|
| 957 | types.emplace_back( param->type ); |
---|
| 958 | |
---|
| 959 | ++crnt; |
---|
| 960 | if ( crnt == end ) break; |
---|
| 961 | param = strict_dynamic_cast< const ast::TypeExpr * >( crnt->get() ); |
---|
| 962 | } while(true); |
---|
| 963 | |
---|
| 964 | return new ast::TupleType{ std::move(types), qs }; |
---|
| 965 | } |
---|
| 966 | |
---|
[90ce35aa] | 967 | template< typename XInstType > |
---|
| 968 | void handleGenericRefType( const XInstType * inst, const ast::Type * other ) { |
---|
[f474e91] | 969 | // check that other type is compatible and named the same |
---|
[90ce35aa] | 970 | const XInstType * otherInst = handleRefType( inst, other ); |
---|
| 971 | if ( ! this->result ) return; |
---|
[7870799] | 972 | |
---|
[f474e91] | 973 | // check that parameters of types unify, if any |
---|
| 974 | const std::vector< ast::ptr< ast::Expr > > & params = inst->params; |
---|
[90ce35aa] | 975 | const std::vector< ast::ptr< ast::Expr > > & params2 = otherInst->params; |
---|
[f474e91] | 976 | |
---|
| 977 | auto it = params.begin(); |
---|
| 978 | auto jt = params2.begin(); |
---|
| 979 | for ( ; it != params.end() && jt != params2.end(); ++it, ++jt ) { |
---|
| 980 | auto param = strict_dynamic_cast< const ast::TypeExpr * >( it->get() ); |
---|
| 981 | auto param2 = strict_dynamic_cast< const ast::TypeExpr * >( jt->get() ); |
---|
| 982 | |
---|
| 983 | ast::ptr< ast::Type > pty = param->type; |
---|
| 984 | ast::ptr< ast::Type > pty2 = param2->type; |
---|
| 985 | |
---|
| 986 | bool isTuple = Tuples::isTtype( pty ); |
---|
| 987 | bool isTuple2 = Tuples::isTtype( pty2 ); |
---|
| 988 | |
---|
| 989 | if ( isTuple && isTuple2 ) { |
---|
| 990 | ++it; ++jt; // skip ttype parameters before break |
---|
[b729c01] | 991 | } else if ( isTuple ) { |
---|
[f474e91] | 992 | // bundle remaining params into tuple |
---|
| 993 | pty2 = tupleFromExprs( param2, jt, params2.end(), pty->qualifiers ); |
---|
| 994 | ++it; // skip ttype parameter for break |
---|
| 995 | } else if ( isTuple2 ) { |
---|
| 996 | // bundle remaining params into tuple |
---|
| 997 | pty = tupleFromExprs( param, it, params.end(), pty2->qualifiers ); |
---|
| 998 | ++jt; // skip ttype parameter for break |
---|
| 999 | } |
---|
| 1000 | |
---|
[7870799] | 1001 | if ( ! unifyExact( |
---|
[ee574a2] | 1002 | pty, pty2, tenv, need, have, open, noWiden(), symtab ) ) { |
---|
[f474e91] | 1003 | result = false; |
---|
| 1004 | return; |
---|
| 1005 | } |
---|
| 1006 | |
---|
| 1007 | // ttype parameter should be last |
---|
| 1008 | if ( isTuple || isTuple2 ) break; |
---|
| 1009 | } |
---|
| 1010 | result = it == params.end() && jt == params2.end(); |
---|
| 1011 | } |
---|
| 1012 | |
---|
| 1013 | public: |
---|
[ee574a2] | 1014 | void postvisit( const ast::StructInstType * aggrType ) { |
---|
[f474e91] | 1015 | handleGenericRefType( aggrType, type2 ); |
---|
| 1016 | } |
---|
| 1017 | |
---|
[ee574a2] | 1018 | void postvisit( const ast::UnionInstType * aggrType ) { |
---|
[f474e91] | 1019 | handleGenericRefType( aggrType, type2 ); |
---|
| 1020 | } |
---|
| 1021 | |
---|
[ee574a2] | 1022 | void postvisit( const ast::EnumInstType * aggrType ) { |
---|
[f474e91] | 1023 | handleRefType( aggrType, type2 ); |
---|
| 1024 | } |
---|
| 1025 | |
---|
[ee574a2] | 1026 | void postvisit( const ast::TraitInstType * aggrType ) { |
---|
[f474e91] | 1027 | handleRefType( aggrType, type2 ); |
---|
| 1028 | } |
---|
| 1029 | |
---|
[ee574a2] | 1030 | void postvisit( const ast::TypeInstType * typeInst ) { |
---|
[3e5dd913] | 1031 | assert( open.find( *typeInst ) == open.end() ); |
---|
[f474e91] | 1032 | handleRefType( typeInst, type2 ); |
---|
| 1033 | } |
---|
| 1034 | |
---|
| 1035 | private: |
---|
| 1036 | /// Creates a tuple type based on a list of Type |
---|
[ef1da0e2] | 1037 | |
---|
[f474e91] | 1038 | |
---|
[7870799] | 1039 | static bool unifyList( |
---|
| 1040 | const std::vector< ast::ptr< ast::Type > > & list1, |
---|
| 1041 | const std::vector< ast::ptr< ast::Type > > & list2, ast::TypeEnvironment & env, |
---|
| 1042 | ast::AssertionSet & need, ast::AssertionSet & have, const ast::OpenVarSet & open, |
---|
[f474e91] | 1043 | const ast::SymbolTable & symtab |
---|
| 1044 | ) { |
---|
| 1045 | auto crnt1 = list1.begin(); |
---|
| 1046 | auto crnt2 = list2.begin(); |
---|
| 1047 | while ( crnt1 != list1.end() && crnt2 != list2.end() ) { |
---|
| 1048 | const ast::Type * t1 = *crnt1; |
---|
| 1049 | const ast::Type * t2 = *crnt2; |
---|
| 1050 | bool isTuple1 = Tuples::isTtype( t1 ); |
---|
| 1051 | bool isTuple2 = Tuples::isTtype( t2 ); |
---|
| 1052 | |
---|
| 1053 | // assumes ttype must be last parameter |
---|
| 1054 | if ( isTuple1 && ! isTuple2 ) { |
---|
| 1055 | // combine entirety of list2, then unify |
---|
[7870799] | 1056 | return unifyExact( |
---|
| 1057 | t1, tupleFromTypes( list2 ), env, need, have, open, |
---|
[ee574a2] | 1058 | noWiden(), symtab ); |
---|
[f474e91] | 1059 | } else if ( ! isTuple1 && isTuple2 ) { |
---|
| 1060 | // combine entirety of list1, then unify |
---|
| 1061 | return unifyExact( |
---|
[7870799] | 1062 | tupleFromTypes( list1 ), t2, env, need, have, open, |
---|
[ee574a2] | 1063 | noWiden(), symtab ); |
---|
[f474e91] | 1064 | } |
---|
| 1065 | |
---|
[7870799] | 1066 | if ( ! unifyExact( |
---|
| 1067 | t1, t2, env, need, have, open, noWiden(), symtab ) |
---|
[f474e91] | 1068 | ) return false; |
---|
| 1069 | |
---|
| 1070 | ++crnt1; ++crnt2; |
---|
| 1071 | } |
---|
| 1072 | |
---|
| 1073 | if ( crnt1 != list1.end() ) { |
---|
| 1074 | // try unifying empty tuple type with ttype |
---|
| 1075 | const ast::Type * t1 = *crnt1; |
---|
| 1076 | if ( ! Tuples::isTtype( t1 ) ) return false; |
---|
[7870799] | 1077 | // xxx - this doesn't generate an empty tuple, contrary to comment; both ported |
---|
[f474e91] | 1078 | // from Rob's code |
---|
[7870799] | 1079 | return unifyExact( |
---|
| 1080 | t1, tupleFromTypes( list2 ), env, need, have, open, |
---|
[ee574a2] | 1081 | noWiden(), symtab ); |
---|
[f474e91] | 1082 | } else if ( crnt2 != list2.end() ) { |
---|
| 1083 | // try unifying empty tuple with ttype |
---|
| 1084 | const ast::Type * t2 = *crnt2; |
---|
| 1085 | if ( ! Tuples::isTtype( t2 ) ) return false; |
---|
[7870799] | 1086 | // xxx - this doesn't generate an empty tuple, contrary to comment; both ported |
---|
[f474e91] | 1087 | // from Rob's code |
---|
| 1088 | return unifyExact( |
---|
[7870799] | 1089 | tupleFromTypes( list1 ), t2, env, need, have, open, |
---|
[ee574a2] | 1090 | noWiden(), symtab ); |
---|
[f474e91] | 1091 | } |
---|
| 1092 | |
---|
| 1093 | return true; |
---|
| 1094 | } |
---|
| 1095 | |
---|
| 1096 | public: |
---|
[ee574a2] | 1097 | void postvisit( const ast::TupleType * tuple ) { |
---|
[f474e91] | 1098 | auto tuple2 = dynamic_cast< const ast::TupleType * >( type2 ); |
---|
| 1099 | if ( ! tuple2 ) return; |
---|
| 1100 | |
---|
| 1101 | ast::Pass<TtypeExpander_new> expander{ tenv }; |
---|
[ef9988b] | 1102 | |
---|
[d3aa64f1] | 1103 | const ast::Type * flat = tuple->accept( expander ); |
---|
| 1104 | const ast::Type * flat2 = tuple2->accept( expander ); |
---|
[f474e91] | 1105 | |
---|
| 1106 | auto types = flatten( flat ); |
---|
| 1107 | auto types2 = flatten( flat2 ); |
---|
| 1108 | |
---|
| 1109 | result = unifyList( types, types2, tenv, need, have, open, symtab ); |
---|
| 1110 | } |
---|
| 1111 | |
---|
[ee574a2] | 1112 | void postvisit( const ast::VarArgsType * ) { |
---|
[f474e91] | 1113 | result = dynamic_cast< const ast::VarArgsType * >( type2 ); |
---|
| 1114 | } |
---|
| 1115 | |
---|
[ee574a2] | 1116 | void postvisit( const ast::ZeroType * ) { |
---|
[f474e91] | 1117 | result = dynamic_cast< const ast::ZeroType * >( type2 ); |
---|
| 1118 | } |
---|
| 1119 | |
---|
[ee574a2] | 1120 | void postvisit( const ast::OneType * ) { |
---|
[f474e91] | 1121 | result = dynamic_cast< const ast::OneType * >( type2 ); |
---|
[7870799] | 1122 | } |
---|
[f474e91] | 1123 | |
---|
| 1124 | private: |
---|
| 1125 | template< typename RefType > void handleRefType( RefType *inst, Type *other ); |
---|
| 1126 | template< typename RefType > void handleGenericRefType( RefType *inst, Type *other ); |
---|
| 1127 | }; |
---|
| 1128 | |
---|
[0d070ca] | 1129 | // size_t Unify_new::traceId = Stats::Heap::new_stacktrace_id("Unify_new"); |
---|
[7870799] | 1130 | bool unify( |
---|
| 1131 | const ast::ptr<ast::Type> & type1, const ast::ptr<ast::Type> & type2, |
---|
| 1132 | ast::TypeEnvironment & env, ast::AssertionSet & need, ast::AssertionSet & have, |
---|
[2773ab8] | 1133 | ast::OpenVarSet & open, const ast::SymbolTable & symtab |
---|
| 1134 | ) { |
---|
| 1135 | ast::ptr<ast::Type> common; |
---|
| 1136 | return unify( type1, type2, env, need, have, open, symtab, common ); |
---|
| 1137 | } |
---|
| 1138 | |
---|
[7870799] | 1139 | bool unify( |
---|
| 1140 | const ast::ptr<ast::Type> & type1, const ast::ptr<ast::Type> & type2, |
---|
| 1141 | ast::TypeEnvironment & env, ast::AssertionSet & need, ast::AssertionSet & have, |
---|
| 1142 | ast::OpenVarSet & open, const ast::SymbolTable & symtab, ast::ptr<ast::Type> & common |
---|
[ee574a2] | 1143 | ) { |
---|
| 1144 | ast::OpenVarSet closed; |
---|
| 1145 | findOpenVars( type1, open, closed, need, have, FirstClosed ); |
---|
| 1146 | findOpenVars( type2, open, closed, need, have, FirstOpen ); |
---|
[7870799] | 1147 | return unifyInexact( |
---|
[ee574a2] | 1148 | type1, type2, env, need, have, open, WidenMode{ true, true }, symtab, common ); |
---|
| 1149 | } |
---|
| 1150 | |
---|
[7870799] | 1151 | bool unifyExact( |
---|
| 1152 | const ast::Type * type1, const ast::Type * type2, ast::TypeEnvironment & env, |
---|
| 1153 | ast::AssertionSet & need, ast::AssertionSet & have, const ast::OpenVarSet & open, |
---|
[f474e91] | 1154 | WidenMode widen, const ast::SymbolTable & symtab |
---|
| 1155 | ) { |
---|
| 1156 | if ( type1->qualifiers != type2->qualifiers ) return false; |
---|
| 1157 | |
---|
| 1158 | auto var1 = dynamic_cast< const ast::TypeInstType * >( type1 ); |
---|
| 1159 | auto var2 = dynamic_cast< const ast::TypeInstType * >( type2 ); |
---|
[7870799] | 1160 | ast::OpenVarSet::const_iterator |
---|
[3e5dd913] | 1161 | entry1 = var1 ? open.find( *var1 ) : open.end(), |
---|
| 1162 | entry2 = var2 ? open.find( *var2 ) : open.end(); |
---|
[f474e91] | 1163 | bool isopen1 = entry1 != open.end(); |
---|
| 1164 | bool isopen2 = entry2 != open.end(); |
---|
| 1165 | |
---|
| 1166 | if ( isopen1 && isopen2 ) { |
---|
| 1167 | if ( entry1->second.kind != entry2->second.kind ) return false; |
---|
[7870799] | 1168 | return env.bindVarToVar( |
---|
| 1169 | var1, var2, ast::TypeDecl::Data{ entry1->second, entry2->second }, need, have, |
---|
[f474e91] | 1170 | open, widen, symtab ); |
---|
| 1171 | } else if ( isopen1 ) { |
---|
| 1172 | return env.bindVar( var1, type2, entry1->second, need, have, open, widen, symtab ); |
---|
| 1173 | } else if ( isopen2 ) { |
---|
| 1174 | return env.bindVar( var2, type1, entry2->second, need, have, open, widen, symtab ); |
---|
| 1175 | } else { |
---|
| 1176 | ast::Pass<Unify_new> comparator{ type2, env, need, have, open, widen, symtab }; |
---|
| 1177 | type1->accept( comparator ); |
---|
[7ff3e522] | 1178 | return comparator.core.result; |
---|
[f474e91] | 1179 | } |
---|
| 1180 | } |
---|
| 1181 | |
---|
[7870799] | 1182 | bool unifyInexact( |
---|
| 1183 | const ast::ptr<ast::Type> & type1, const ast::ptr<ast::Type> & type2, |
---|
| 1184 | ast::TypeEnvironment & env, ast::AssertionSet & need, ast::AssertionSet & have, |
---|
| 1185 | const ast::OpenVarSet & open, WidenMode widen, const ast::SymbolTable & symtab, |
---|
| 1186 | ast::ptr<ast::Type> & common |
---|
[f474e91] | 1187 | ) { |
---|
| 1188 | ast::CV::Qualifiers q1 = type1->qualifiers, q2 = type2->qualifiers; |
---|
[7870799] | 1189 | |
---|
| 1190 | // force t1 and t2 to be cloned if their qualifiers must be stripped, so that type1 and |
---|
[f474e91] | 1191 | // type2 are left unchanged; calling convention forces type{1,2}->strong_ref >= 1 |
---|
[2890212] | 1192 | ast::Type * t1 = shallowCopy(type1.get()); |
---|
| 1193 | ast::Type * t2 = shallowCopy(type2.get()); |
---|
| 1194 | t1->qualifiers = {}; |
---|
| 1195 | t2->qualifiers = {}; |
---|
[f49b3fc] | 1196 | ast::ptr< ast::Type > t1_(t1); |
---|
| 1197 | ast::ptr< ast::Type > t2_(t2); |
---|
[7870799] | 1198 | |
---|
[f474e91] | 1199 | if ( unifyExact( t1, t2, env, need, have, open, widen, symtab ) ) { |
---|
| 1200 | // if exact unification on unqualified types, try to merge qualifiers |
---|
| 1201 | if ( q1 == q2 || ( ( q1 > q2 || widen.first ) && ( q2 > q1 || widen.second ) ) ) { |
---|
[2890212] | 1202 | t1->qualifiers = q1 | q2; |
---|
| 1203 | common = t1; |
---|
[f474e91] | 1204 | return true; |
---|
| 1205 | } else { |
---|
| 1206 | return false; |
---|
| 1207 | } |
---|
| 1208 | |
---|
[ef1da0e2] | 1209 | } else if ( common = commonType( t1, t2, env, need, have, open, widen, symtab )) { |
---|
[f474e91] | 1210 | // no exact unification, but common type |
---|
[2890212] | 1211 | auto c = shallowCopy(common.get()); |
---|
| 1212 | c->qualifiers = q1 | q2; |
---|
| 1213 | common = c; |
---|
[f474e91] | 1214 | return true; |
---|
| 1215 | } else { |
---|
| 1216 | return false; |
---|
| 1217 | } |
---|
| 1218 | } |
---|
| 1219 | |
---|
[54e41b3] | 1220 | ast::ptr<ast::Type> extractResultType( const ast::FunctionType * func ) { |
---|
[4139e3d] | 1221 | if ( func->returns.empty() ) return new ast::VoidType{}; |
---|
[954c954] | 1222 | if ( func->returns.size() == 1 ) return func->returns[0]; |
---|
[4139e3d] | 1223 | |
---|
| 1224 | std::vector<ast::ptr<ast::Type>> tys; |
---|
[954c954] | 1225 | for ( const auto & decl : func->returns ) { |
---|
| 1226 | tys.emplace_back( decl ); |
---|
[4139e3d] | 1227 | } |
---|
| 1228 | return new ast::TupleType{ std::move(tys) }; |
---|
[54e41b3] | 1229 | } |
---|
[51b7345] | 1230 | } // namespace ResolvExpr |
---|
[a32b204] | 1231 | |
---|
| 1232 | // Local Variables: // |
---|
| 1233 | // tab-width: 4 // |
---|
| 1234 | // mode: c++ // |
---|
| 1235 | // compile-command: "make install" // |
---|
| 1236 | // End: // |
---|