| 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 | // AddressExpr.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 23:54:44 2015 |
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| 11 | // Last Modified By : Rob Schluntz |
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| 12 | // Last Modified On : Tue Apr 26 12:35:13 2016 |
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| 13 | // Update Count : 6 |
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| 14 | // |
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| 15 | |
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| 16 | #include <ostream> // for ostream, operator<<, basic_ostream, endl |
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| 17 | #include <string> // for operator<<, string |
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| 18 | |
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| 19 | #include "Common/utility.h" // for maybeClone |
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| 20 | #include "Expression.h" // for AddressExpr, Expression |
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| 21 | #include "Type.h" // for PointerType, Type, Type::Qualifiers |
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| 22 | |
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| 23 | // Address expressions are typed based on the following inference rules: |
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| 24 | // E : lvalue T &..& (n references) |
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| 25 | // &E : T *&..& (n references) |
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| 26 | // |
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| 27 | // E : T &..& (m references) |
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| 28 | // &E : T *&..& (m-1 references) |
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| 29 | // |
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| 30 | // That is, lvalues becomes |
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| 31 | |
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| 32 | namespace { |
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| 33 | Type * addrType( Type * type ) { |
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| 34 | if ( ReferenceType * refType = dynamic_cast< ReferenceType * >( type ) ) { |
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| 35 | return new ReferenceType( refType->get_qualifiers(), addrType( refType->base ) ); |
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| 36 | } else { |
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| 37 | return new PointerType( Type::Qualifiers(), type->clone() ); |
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| 38 | } |
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| 39 | } |
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| 40 | } |
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| 41 | |
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| 42 | AddressExpr::AddressExpr( Expression *arg ) : Expression(), arg( arg ) { |
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| 43 | if ( arg->result ) { |
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| 44 | if ( arg->result->get_lvalue() ) { |
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| 45 | // lvalue, retains all layers of reference and gains a pointer inside the references |
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| 46 | set_result( addrType( arg->result ) ); |
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| 47 | } else { |
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| 48 | // taking address of non-lvalue -- must be a reference, loses one layer of reference |
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| 49 | ReferenceType * refType = strict_dynamic_cast< ReferenceType * >( arg->result ); |
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| 50 | set_result( addrType( refType->base ) ); |
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| 51 | } |
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| 52 | // result of & is never an lvalue |
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| 53 | get_result()->set_lvalue( false ); |
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| 54 | } |
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| 55 | } |
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| 56 | |
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| 57 | AddressExpr::AddressExpr( const AddressExpr &other ) : Expression( other ), arg( maybeClone( other.arg ) ) { |
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| 58 | } |
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| 59 | |
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| 60 | void AddressExpr::print( std::ostream &os, Indenter indent ) const { |
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| 61 | os << "Address of:" << std::endl; |
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| 62 | if ( arg ) { |
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| 63 | os << indent+1; |
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| 64 | arg->print( os, indent+1 ); |
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| 65 | } // if |
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| 66 | } |
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| 67 | |
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| 68 | LabelAddressExpr::LabelAddressExpr( const Label &arg ) : arg( arg ) { |
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| 69 | // label address always has type void * |
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| 70 | result = new PointerType( Type::Qualifiers(), new VoidType( Type::Qualifiers() ) ); |
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| 71 | } |
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| 72 | LabelAddressExpr::LabelAddressExpr( const LabelAddressExpr & other ) : Expression( other ), arg( other.arg ) {} |
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| 73 | |
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| 74 | void LabelAddressExpr::print( std::ostream & os, Indenter ) const { |
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| 75 | os << "Address of label:" << arg; |
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| 76 | } |
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| 77 | |
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| 78 | // Local Variables: // |
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| 79 | // tab-width: 4 // |
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| 80 | // mode: c++ // |
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| 81 | // compile-command: "make install" // |
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| 82 | // End: // |
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