| 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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| 7 | // Occurs.cc -- |
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| 8 | // |
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| 9 | // Author : Richard C. Bilson |
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| 10 | // Created On : Sun May 17 09:47:41 2015 |
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| 11 | // Last Modified By : Peter A. Buhr |
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| 12 | // Last Modified On : Sun May 17 09:49:26 2015 |
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| 13 | // Update Count : 2 |
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| 14 | // |
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| 15 | |
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| 16 | #include <string> // for string |
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| 17 | #include <unordered_set> // for unordered_set |
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| 18 | |
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| 19 | #include "Common/PassVisitor.h" |
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| 20 | #include "SynTree/Type.h" // for TypeInstType, Type |
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| 21 | #include "TypeEnvironment.h" // for ClassRef, TypeEnvironment |
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| 22 | |
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| 23 | namespace ResolvExpr { |
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| 24 | struct Occurs : public WithVisitorRef<Occurs> { |
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| 25 | Occurs( std::string varName, const TypeEnvironment &env ); |
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| 26 | void previsit( TypeInstType * typeInst ); |
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| 27 | |
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| 28 | bool result; |
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| 29 | using VarSet = std::unordered_set< std::string >; |
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| 30 | VarSet eqvVars; |
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| 31 | const TypeEnvironment &tenv; |
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| 32 | }; |
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| 33 | |
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| 34 | bool occurs( Type *type, std::string varName, const TypeEnvironment &env ) { |
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| 35 | PassVisitor<Occurs> occur( varName, env ); |
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| 36 | type->accept( occur ); |
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| 37 | return occur.pass.result; |
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| 38 | } |
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| 39 | |
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| 40 | Occurs::Occurs( std::string varName, const TypeEnvironment & env ) : result( false ), tenv( env ) { |
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| 41 | if ( ClassRef eqvClass = tenv.lookup( varName ) ) { |
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| 42 | eqvVars = eqvClass.get_vars<VarSet>(); |
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| 43 | } else { |
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| 44 | eqvVars.insert( varName ); |
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| 45 | } // if |
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| 46 | } |
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| 47 | |
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| 48 | void Occurs::previsit( TypeInstType * typeInst ) { |
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| 49 | /// std::cerr << "searching for vars: "; |
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| 50 | /// std::copy( eqvVars.begin(), eqvVars.end(), std::ostream_iterator< std::string >( std::cerr, " " ) ); |
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| 51 | /// std::cerr << std::endl; |
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| 52 | if ( eqvVars.find( typeInst->get_name() ) != eqvVars.end() ) { |
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| 53 | result = true; |
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| 54 | } else if ( ClassRef eqvClass = tenv.lookup( typeInst->get_name() ) ) { |
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| 55 | if ( Type* boundTy = eqvClass.get_bound().type ) { |
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| 56 | /// std::cerr << typeInst->get_name() << " is bound to"; |
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| 57 | /// boundTy->print( std::cerr ); |
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| 58 | /// std::cerr << std::endl; |
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| 59 | boundTy->accept( *visitor ); |
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| 60 | } // if |
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| 61 | } // if |
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| 62 | } |
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| 63 | } // namespace ResolvExpr |
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| 64 | |
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| 65 | // Local Variables: // |
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| 66 | // tab-width: 4 // |
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| 67 | // mode: c++ // |
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| 68 | // compile-command: "make install" // |
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| 69 | // End: // |
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