| 1 | //
|
|---|
| 2 | // Cforall Version 1.0.0 Copyright (C) 2015 University of Waterloo
|
|---|
| 3 | //
|
|---|
| 4 | // The contents of this file are covered under the licence agreement in the
|
|---|
| 5 | // file "LICENCE" distributed with Cforall.
|
|---|
| 6 | //
|
|---|
| 7 | // AddressExpr.cc --
|
|---|
| 8 | //
|
|---|
| 9 | // Author : Richard C. Bilson
|
|---|
| 10 | // Created On : Sun May 17 23:54:44 2015
|
|---|
| 11 | // Last Modified By : Rob Schluntz
|
|---|
| 12 | // Last Modified On : Tue Apr 26 12:35:13 2016
|
|---|
| 13 | // Update Count : 6
|
|---|
| 14 | //
|
|---|
| 15 |
|
|---|
| 16 | #include <ostream> // for ostream, operator<<, basic_ostream, endl
|
|---|
| 17 | #include <string> // for operator<<, string
|
|---|
| 18 |
|
|---|
| 19 | #include "Common/utility.h" // for maybeClone
|
|---|
| 20 | #include "Expression.h" // for AddressExpr, Expression
|
|---|
| 21 | #include "Type.h" // for PointerType, Type, Type::Qualifiers
|
|---|
| 22 |
|
|---|
| 23 | // Address expressions are typed based on the following inference rules:
|
|---|
| 24 | // E : lvalue T &..& (n references)
|
|---|
| 25 | // &E : T *&..& (n references)
|
|---|
| 26 | //
|
|---|
| 27 | // E : T &..& (m references)
|
|---|
| 28 | // &E : T *&..& (m-1 references)
|
|---|
| 29 | //
|
|---|
| 30 | // That is, lvalues becomes
|
|---|
| 31 |
|
|---|
| 32 | namespace {
|
|---|
| 33 | Type * addrType( Type * type ) {
|
|---|
| 34 | if ( ReferenceType * refType = dynamic_cast< ReferenceType * >( type ) ) {
|
|---|
| 35 | return new ReferenceType( refType->get_qualifiers(), addrType( refType->base ) );
|
|---|
| 36 | } else {
|
|---|
| 37 | return new PointerType( Type::Qualifiers(), type->clone() );
|
|---|
| 38 | }
|
|---|
| 39 | }
|
|---|
| 40 | }
|
|---|
| 41 |
|
|---|
| 42 | AddressExpr::AddressExpr( Expression *arg ) : Expression(), arg( arg ) {
|
|---|
| 43 | if ( arg->result ) {
|
|---|
| 44 | if ( arg->result->get_lvalue() ) {
|
|---|
| 45 | // lvalue, retains all layers of reference and gains a pointer inside the references
|
|---|
| 46 | set_result( addrType( arg->result ) );
|
|---|
| 47 | } else {
|
|---|
| 48 | // taking address of non-lvalue -- must be a reference, loses one layer of reference
|
|---|
| 49 | ReferenceType * refType = strict_dynamic_cast< ReferenceType * >( arg->result );
|
|---|
| 50 | set_result( addrType( refType->base ) );
|
|---|
| 51 | }
|
|---|
| 52 | // result of & is never an lvalue
|
|---|
| 53 | get_result()->set_lvalue( false );
|
|---|
| 54 | }
|
|---|
| 55 | }
|
|---|
| 56 |
|
|---|
| 57 | AddressExpr::AddressExpr( const AddressExpr &other ) : Expression( other ), arg( maybeClone( other.arg ) ) {
|
|---|
| 58 | }
|
|---|
| 59 |
|
|---|
| 60 | void AddressExpr::print( std::ostream &os, Indenter indent ) const {
|
|---|
| 61 | os << "Address of:" << std::endl;
|
|---|
| 62 | if ( arg ) {
|
|---|
| 63 | os << indent+1;
|
|---|
| 64 | arg->print( os, indent+1 );
|
|---|
| 65 | } // if
|
|---|
| 66 | }
|
|---|
| 67 |
|
|---|
| 68 | LabelAddressExpr::LabelAddressExpr( const Label &arg ) : arg( arg ) {
|
|---|
| 69 | // label address always has type void *
|
|---|
| 70 | result = new PointerType( Type::Qualifiers(), new VoidType( Type::Qualifiers() ) );
|
|---|
| 71 | }
|
|---|
| 72 | LabelAddressExpr::LabelAddressExpr( const LabelAddressExpr & other ) : Expression( other ), arg( other.arg ) {}
|
|---|
| 73 |
|
|---|
| 74 | void LabelAddressExpr::print( std::ostream & os, Indenter ) const {
|
|---|
| 75 | os << "Address of label:" << arg;
|
|---|
| 76 | }
|
|---|
| 77 |
|
|---|
| 78 | // Local Variables: //
|
|---|
| 79 | // tab-width: 4 //
|
|---|
| 80 | // mode: c++ //
|
|---|
| 81 | // compile-command: "make install" //
|
|---|
| 82 | // End: //
|
|---|
