| 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 <set> // for set, _Rb_tree_const_iterator
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| 17 | #include <string> // for string
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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 EqvClass, 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 | std::set< std::string > eqvVars;
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| 30 | const TypeEnvironment &tenv;
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| 31 | };
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| 32 |
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| 33 | bool occurs( Type *type, std::string varName, const TypeEnvironment &env ) {
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| 34 | PassVisitor<Occurs> occur( varName, env );
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| 35 | type->accept( occur );
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| 36 | return occur.pass.result;
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| 37 | }
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| 38 |
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| 39 | Occurs::Occurs( std::string varName, const TypeEnvironment & env ) : result( false ), tenv( env ) {
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| 40 | if ( const EqvClass *eqvClass = tenv.lookup( varName ) ) {
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| 41 | eqvVars = eqvClass->vars;
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| 42 | } else {
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| 43 | eqvVars.insert( varName );
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| 44 | } // if
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| 45 | }
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| 46 |
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| 47 | void Occurs::previsit( TypeInstType * typeInst ) {
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| 48 | /// std::cerr << "searching for vars: ";
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| 49 | /// std::copy( eqvVars.begin(), eqvVars.end(), std::ostream_iterator< std::string >( std::cerr, " " ) );
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| 50 | /// std::cerr << std::endl;
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| 51 | if ( eqvVars.find( typeInst->get_name() ) != eqvVars.end() ) {
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| 52 | result = true;
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| 53 | } else if ( const EqvClass *eqvClass = tenv.lookup( typeInst->get_name() ) ) {
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| 54 | if ( eqvClass->type ) {
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| 55 | /// std::cerr << typeInst->get_name() << " is bound to";
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| 56 | /// eqvClass.type->print( std::cerr );
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| 57 | /// std::cerr << std::endl;
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| 58 | eqvClass->type->accept( *visitor );
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| 59 | } // if
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| 60 | } // if
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| 61 | }
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| 62 | } // namespace ResolvExpr
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| 63 |
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| 64 | // Local Variables: //
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| 65 | // tab-width: 4 //
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| 66 | // mode: c++ //
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| 67 | // compile-command: "make install" //
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| 68 | // End: //
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