| 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 : Peter A. Buhr
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| 12 | // Last Modified On : Thu Feb 28 13:13:38 2019
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| 13 | // Update Count : 10
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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->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 | if ( ReferenceType * refType = dynamic_cast< ReferenceType * >( arg->result ) ) {
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| 50 | set_result( addrType( refType->base ) );
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| 51 | } else {
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| 52 | if(!arg->result->location.isSet()) arg->result->location = arg->location;
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| 53 | SemanticError( arg->result, "Attempt to take address of non-lvalue expression: " );
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| 54 | } // if
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| 55 | }
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| 56 | }
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| 57 | }
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| 58 |
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| 59 | AddressExpr::AddressExpr( const AddressExpr &other ) : Expression( other ), arg( maybeClone( other.arg ) ) {
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| 60 | }
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| 61 |
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| 62 | AddressExpr::~AddressExpr() {
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| 63 | delete arg;
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| 64 | }
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| 65 |
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| 66 | void AddressExpr::print( std::ostream &os, Indenter indent ) const {
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| 67 | os << "Address of:" << std::endl;
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| 68 | if ( arg ) {
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| 69 | os << indent+1;
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| 70 | arg->print( os, indent+1 );
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| 71 | } // if
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| 72 | }
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| 73 |
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| 74 | LabelAddressExpr::LabelAddressExpr( const Label &arg ) : arg( arg ) {
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| 75 | // label address always has type void *
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| 76 | result = new PointerType( Type::Qualifiers(), new VoidType( Type::Qualifiers() ) );
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| 77 | }
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| 78 | LabelAddressExpr::LabelAddressExpr( const LabelAddressExpr & other ) : Expression( other ), arg( other.arg ) {}
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| 79 | LabelAddressExpr::~LabelAddressExpr() {}
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| 80 |
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| 81 | void LabelAddressExpr::print( std::ostream & os, Indenter ) const {
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| 82 | os << "Address of label:" << arg;
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| 83 | }
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| 84 |
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| 85 | // Local Variables: //
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| 86 | // tab-width: 4 //
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| 87 | // mode: c++ //
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| 88 | // compile-command: "make install" //
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| 89 | // End: //
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