source: src/CodeGen/GenType.cc @ 29f4fe62

//
// 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.
//
// GenType.cc -- 
//
// Author           : Richard C. Bilson
// Created On       : Mon May 18 07:44:20 2015
// Last Modified By : Peter A. Buhr
// Last Modified On : Thu Jul  9 16:43:52 2015
// Update Count     : 13
//

#include <sstream>
#include <cassert>

#include "GenType.h"
#include "CodeGenerator.h"

#include "SynTree/Declaration.h"
#include "SynTree/Expression.h"
#include "SynTree/Type.h"
#include "SynTree/Visitor.h"

namespace CodeGen {
        class GenType : public Visitor {
          public:
                GenType( const std::string &typeString );
                std::string get_typeString() const { return typeString; }
                void set_typeString( const std::string &newValue ) { typeString = newValue; }
  
                virtual void visit( FunctionType *funcType );
                virtual void visit( VoidType *voidType );
                virtual void visit( BasicType *basicType );
                virtual void visit( PointerType *pointerType );
                virtual void visit( ArrayType *arrayType );
                virtual void visit( StructInstType *structInst );
                virtual void visit( UnionInstType *unionInst );
                virtual void visit( EnumInstType *enumInst );
                virtual void visit( TypeInstType *typeInst );
                virtual void visit( VarArgsType *varArgsType );
  
          private:
                void handleQualifiers( Type *type );
                void genArray( const Type::Qualifiers &qualifiers, Type *base, Expression *dimension, bool isVarLen, bool isStatic );
  
                std::string typeString;
        };

        std::string genType( Type *type, const std::string &baseString ) {
                GenType gt( baseString );
                type->accept( gt );
                return gt.get_typeString();
        }

        GenType::GenType( const std::string &typeString ) : typeString( typeString ) {}

        void GenType::visit( VoidType *voidType ) {
                typeString = "void " + typeString;
                handleQualifiers( voidType );
        }

        void GenType::visit( BasicType *basicType ) {
                BasicType::Kind kind = basicType->get_kind();
                assert( 0 <= kind && kind < BasicType::NUMBER_OF_BASIC_TYPES );
                typeString = std::string( BasicType::typeNames[kind] ) + " " + typeString;
                handleQualifiers( basicType );
        }

        void GenType::genArray( const Type::Qualifiers &qualifiers, Type *base, Expression *dimension, bool isVarLen, bool isStatic ) {
                std::ostringstream os;
                if ( typeString != "" ) {
                        if ( typeString[ 0 ] == '*' ) {
                                os << "(" << typeString << ")";
                        } else {
                                os << typeString;
                        } // if
                } // if
                os << "[";

                if ( isStatic ) {
                        os << "static ";
                } // if
                if ( qualifiers.isConst ) {
                        os << "const ";
                } // if
                if ( qualifiers.isVolatile ) {
                        os << "volatile ";
                } // if
                if ( qualifiers.isRestrict ) {
                        os << "__restrict ";
                } // if
                if ( qualifiers.isAtomic ) {
                        os << "_Atomic ";
                } // if
                if ( qualifiers.isAttribute ) {
                        os << "__attribute(( )) ";
                } // if
                if ( dimension != 0 ) {
                        CodeGenerator cg( os );
                        dimension->accept( cg );
                } else if ( isVarLen ) {
                        // no dimension expression on a VLA means it came in with the * token
                        os << "*";
                } // if
                os << "]";

                typeString = os.str();
  
                base->accept( *this );
        }

        void GenType::visit( PointerType *pointerType ) {
                assert( pointerType->get_base() != 0);
                if ( pointerType->get_isStatic() || pointerType->get_isVarLen() || pointerType->get_dimension() ) {
                        genArray( pointerType->get_qualifiers(), pointerType->get_base(), pointerType->get_dimension(), pointerType->get_isVarLen(), pointerType->get_isStatic() );
                } else {
                        handleQualifiers( pointerType );
                        if ( typeString[ 0 ] == '?' ) {
                                typeString = "* " + typeString;
                        } else {
                                typeString = "*" + typeString;
                        } // if
                        pointerType->get_base()->accept( *this );
                } // if
        }

        void GenType::visit( ArrayType *arrayType ) {
                genArray( arrayType->get_qualifiers(), arrayType->get_base(), arrayType->get_dimension(), arrayType->get_isVarLen(), arrayType->get_isStatic() );
        }

        void GenType::visit( FunctionType *funcType ) {
                std::ostringstream os;

                if ( typeString != "" ) {
                        if ( typeString[ 0 ] == '*' ) {
                                os << "(" << typeString << ")";
                        } else {
                                os << typeString;
                        } // if
                } // if
  
                /************* parameters ***************/

                const std::list<DeclarationWithType *> &pars = funcType->get_parameters();

                if ( pars.empty() ) {
                        if ( funcType->get_isVarArgs() ) {
                                os << "()";
                        } else {
                                os << "(void)";
                        } // if
                } else {
                        CodeGenerator cg( os );
                        os << "(" ;

                        cg.genCommaList( pars.begin(), pars.end() );

                        if ( funcType->get_isVarArgs() ) {
                                os << ", ...";
                        } // if
                        os << ")";
                } // if
  
                typeString = os.str();

                if ( funcType->get_returnVals().size() == 0 ) {
                        typeString = "void " + typeString;
                } else {
                        funcType->get_returnVals().front()->get_type()->accept( *this );
                } // if
        }

        void GenType::visit( StructInstType *structInst )  {
                typeString = "struct " + structInst->get_name() + " " + typeString;
                handleQualifiers( structInst );
        }

        void GenType::visit( UnionInstType *unionInst ) {
                typeString = "union " + unionInst->get_name() + " " + typeString;
                handleQualifiers( unionInst );
        }

        void GenType::visit( EnumInstType *enumInst ) {
                typeString = "enum " + enumInst->get_name() + " " + typeString;
                handleQualifiers( enumInst );
        }

        void GenType::visit( TypeInstType *typeInst ) {
                typeString = typeInst->get_name() + " " + typeString;
                handleQualifiers( typeInst );
        }

        void GenType::visit( VarArgsType *varArgsType ) {
                typeString = "__builtin_va_list " + typeString;
                handleQualifiers( varArgsType );
        }

        void GenType::handleQualifiers( Type *type ) {
                if ( type->get_isConst() ) {
                        typeString = "const " + typeString;
                } // if
                if ( type->get_isVolatile() ) {
                        typeString = "volatile " + typeString;
                } // if
                if ( type->get_isRestrict() ) {
                        typeString = "__restrict " + typeString;
                } // if
                if ( type->get_isAtomic() ) {
                        typeString = "_Atomic " + typeString;
                } // if
                if ( type->get_isAttribute() ) {
                        typeString = "__attribute(( )) " + typeString;
                } // if
        }
} // namespace CodeGen

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