source: src/ResolvExpr/ResolveTypeof.cc @ 0588d8c

//
// Cforall Version 1.0.0 Copyright (C) 2015 University of Waterloo
//
// The contents of this file are covered under the licence agreement in the
// file "LICENCE" distributed with Cforall.
//
// ResolveTypeof.cc --
//
// Author           : Richard C. Bilson
// Created On       : Sun May 17 12:12:20 2015
// Last Modified By : Peter A. Buhr
// Last Modified On : Tue May 19 16:49:04 2015
// Update Count     : 3
//

#include "ResolveTypeof.h"

#include <cassert>               // for assert

#include "Common/PassVisitor.h"  // for PassVisitor
#include "Resolver.h"            // for resolveInVoidContext
#include "SynTree/Expression.h"  // for Expression
#include "SynTree/Mutator.h"     // for Mutator
#include "SynTree/Type.h"        // for TypeofType, Type

namespace SymTab {
class Indexer;
}  // namespace SymTab

namespace ResolvExpr {
        namespace {
#if 0
                void
                printAlts( const AltList &list, std::ostream &os, int indent = 0 )
                {
                        for ( AltList::const_iterator i = list.begin(); i != list.end(); ++i ) {
                                i->print( os, indent );
                                os << std::endl;
                        }
                }
#endif
        }

        class ResolveTypeof : public WithShortCircuiting {
          public:
                ResolveTypeof( const SymTab::Indexer &indexer ) : indexer( indexer ) {}
                void premutate( TypeofType *typeofType );
                Type * postmutate( TypeofType *typeofType );

          private:
                const SymTab::Indexer &indexer;
        };

        Type * resolveTypeof( Type *type, const SymTab::Indexer &indexer ) {
                PassVisitor<ResolveTypeof> mutator( indexer );
                return type->acceptMutator( mutator );
        }

        void ResolveTypeof::premutate( TypeofType * ) {
                visit_children = false;
        }

        Type * ResolveTypeof::postmutate( TypeofType *typeofType ) {
#if 0
                std::cerr << "resolving typeof: ";
                typeofType->print( std::cerr );
                std::cerr << std::endl;
#endif
                // pass on null expression
                if ( ! typeofType->expr ) return typeofType;

                bool isBasetypeof = typeofType->is_basetypeof;
                auto oldQuals = typeofType->get_qualifiers().val;

                Type* newType;
                if ( TypeExpr* tyExpr = dynamic_cast<TypeExpr*>(typeofType->expr) ) {
                        // typeof wrapping type
                        newType = tyExpr->type;
                        tyExpr->type = nullptr;
                        delete tyExpr;
                } else {
                        // typeof wrapping expression
                        Expression * newExpr = resolveInVoidContext( typeofType->expr, indexer );
                        assert( newExpr->result && ! newExpr->result->isVoid() );
                        newType = newExpr->result;
                        newExpr->result = nullptr;
                        delete typeofType;
                        delete newExpr;
                }

                // clear qualifiers for base, combine with typeoftype quals in any case
                if ( isBasetypeof ) {
                        // replace basetypeof(<enum>) by int
                        if ( dynamic_cast<EnumInstType*>(newType) ) {
                                Type* newerType = 
                                        new BasicType{ newType->get_qualifiers(), BasicType::SignedInt, 
                                        newType->attributes };
                                delete newType;
                                newType = newerType;
                        }
                        newType->get_qualifiers().val 
                                = ( newType->get_qualifiers().val & ~Type::Qualifiers::Mask ) | oldQuals;
                } else {
                        newType->get_qualifiers().val |= oldQuals;
                }
                
                return newType;
        }
} // namespace ResolvExpr

// Local Variables: //
// tab-width: 4 //
// mode: c++ //
// compile-command: "make install" //
// End: //