Classifications

• • H—ELECTRICITY
  • H04—ELECTRIC COMMUNICATION TECHNIQUE
  • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
  • H04L12/00—Data switching networks
  • H04L12/28—Data switching networks characterised by path configuration, e.g. LAN [Local Area Networks] or WAN [Wide Area Networks]
  • H04L12/2803—Home automation networks
  • H04L12/2807—Exchanging configuration information on appliance services in a home automation network
  • H04L12/2814—Exchanging control software or macros for controlling appliance services in a home automation network
• • G—PHYSICS
  • G06—COMPUTING; CALCULATING OR COUNTING
  • G06F—ELECTRIC DIGITAL DATA PROCESSING
  • G06F8/00—Arrangements for software engineering
  • G06F8/30—Creation or generation of source code
  • G06F8/38—Creation or generation of source code for implementing user interfaces
• • G—PHYSICS
  • G06—COMPUTING; CALCULATING OR COUNTING
  • G06F—ELECTRIC DIGITAL DATA PROCESSING
  • G06F9/00—Arrangements for program control, e.g. control units
  • G06F9/06—Arrangements for program control, e.g. control units using stored programs, i.e. using an internal store of processing equipment to receive or retain programs
  • G06F9/44—Arrangements for executing specific programs
  • G06F9/448—Execution paradigms, e.g. implementations of programming paradigms
  • G06F9/4488—Object-oriented
  • G06F9/449—Object-oriented method invocation or resolution
• • G—PHYSICS
  • G06—COMPUTING; CALCULATING OR COUNTING
  • G06F—ELECTRIC DIGITAL DATA PROCESSING
  • G06F9/00—Arrangements for program control, e.g. control units
  • G06F9/06—Arrangements for program control, e.g. control units using stored programs, i.e. using an internal store of processing equipment to receive or retain programs
  • G06F9/46—Multiprogramming arrangements
  • G06F9/465—Distributed object oriented systems
• • G—PHYSICS
  • G06—COMPUTING; CALCULATING OR COUNTING
  • G06T—IMAGE DATA PROCESSING OR GENERATION, IN GENERAL
  • G06T1/00—General purpose image data processing
• • H—ELECTRICITY
  • H04—ELECTRIC COMMUNICATION TECHNIQUE
  • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
  • H04L12/00—Data switching networks
  • H04L12/28—Data switching networks characterised by path configuration, e.g. LAN [Local Area Networks] or WAN [Wide Area Networks]
  • H04L12/2803—Home automation networks
• • H—ELECTRICITY
  • H04—ELECTRIC COMMUNICATION TECHNIQUE
  • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
  • H04L41/00—Arrangements for maintenance, administration or management of data switching networks, e.g. of packet switching networks
  • H04L41/22—Arrangements for maintenance, administration or management of data switching networks, e.g. of packet switching networks comprising specially adapted graphical user interfaces [GUI]
• • H—ELECTRICITY
  • H04—ELECTRIC COMMUNICATION TECHNIQUE
  • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
  • H04L67/00—Network arrangements or protocols for supporting network services or applications
  • H04L67/01—Protocols
  • H04L67/12—Protocols specially adapted for proprietary or special-purpose networking environments, e.g. medical networks, sensor networks, networks in vehicles or remote metering networks
  • H04L67/125—Protocols specially adapted for proprietary or special-purpose networking environments, e.g. medical networks, sensor networks, networks in vehicles or remote metering networks involving control of end-device applications over a network
• • H—ELECTRICITY
  • H05—ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
  • H05B—ELECTRIC HEATING; ELECTRIC LIGHT SOURCES NOT OTHERWISE PROVIDED FOR; CIRCUIT ARRANGEMENTS FOR ELECTRIC LIGHT SOURCES, IN GENERAL
  • H05B47/00—Circuit arrangements for operating light sources in general, i.e. where the type of light source is not relevant
  • H05B47/10—Controlling the light source
  • H05B47/155—Coordinated control of two or more light sources
• • H—ELECTRICITY
  • H05—ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
  • H05B—ELECTRIC HEATING; ELECTRIC LIGHT SOURCES NOT OTHERWISE PROVIDED FOR; CIRCUIT ARRANGEMENTS FOR ELECTRIC LIGHT SOURCES, IN GENERAL
  • H05B47/00—Circuit arrangements for operating light sources in general, i.e. where the type of light source is not relevant
  • H05B47/10—Controlling the light source
  • H05B47/175—Controlling the light source by remote control
  • H05B47/18—Controlling the light source by remote control via data-bus transmission
• • H—ELECTRICITY
  • H04—ELECTRIC COMMUNICATION TECHNIQUE
  • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
  • H04L12/00—Data switching networks
  • H04L12/28—Data switching networks characterised by path configuration, e.g. LAN [Local Area Networks] or WAN [Wide Area Networks]
  • H04L12/2803—Home automation networks
  • H04L2012/2847—Home automation networks characterised by the type of home appliance used
  • H04L2012/2849—Audio/video appliances
• • H—ELECTRICITY
  • H04—ELECTRIC COMMUNICATION TECHNIQUE
  • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
  • H04L41/00—Arrangements for maintenance, administration or management of data switching networks, e.g. of packet switching networks
  • H04L41/02—Standardisation; Integration
  • H04L41/0233—Object-oriented techniques, for representation of network management data, e.g. common object request broker architecture [CORBA]
• • H—ELECTRICITY
  • H04—ELECTRIC COMMUNICATION TECHNIQUE
  • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
  • H04L41/00—Arrangements for maintenance, administration or management of data switching networks, e.g. of packet switching networks
  • H04L41/40—Arrangements for maintenance, administration or management of data switching networks, e.g. of packet switching networks using virtualisation of network functions or resources, e.g. SDN or NFV entities
• • H—ELECTRICITY
  • H04—ELECTRIC COMMUNICATION TECHNIQUE
  • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
  • H04L67/00—Network arrangements or protocols for supporting network services or applications
  • H04L67/50—Network services
  • H04L67/75—Indicating network or usage conditions on the user display
• • H—ELECTRICITY
  • H05—ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
  • H05B—ELECTRIC HEATING; ELECTRIC LIGHT SOURCES NOT OTHERWISE PROVIDED FOR; CIRCUIT ARRANGEMENTS FOR ELECTRIC LIGHT SOURCES, IN GENERAL
  • H05B47/00—Circuit arrangements for operating light sources in general, i.e. where the type of light source is not relevant
  • H05B47/10—Controlling the light source
  • H05B47/165—Controlling the light source following a pre-assigned programmed sequence; Logic control [LC]

Definitions

• the described technology relates generally to object-oriented programming techniques and more specifically to a system for automatically implementing virtual functions.
• Object-oriented prograrnming techniques allow for the defining of "interfaces" by which objects can expose their functionality independently of the implementation of the functionality.
• an interface is defined by an abstract class whose virtual functions are all pure. A pure virtual function is one that has no implementation in the class. Thus, an interface defines only the order of the virtual functions within the class and the signatures of the virtual functions, but not their implementations.
• class IShape class IShape
• This interface has three virtual functions: draw, save, and clear.
• the save function of the IShape interface may have an implementation that saves the shape information to a file on a local file system.
• Another implementation may save the shape information to a file server accessible via the Internet.
• class that implements the interfaces inherits the interface.
• class Shape IShape
• the first line of the class definition indicates by the ": IShape" that the Shape class inherits the IShape interface.
• the ellipses between the braces indicate source code that implements the virtual functions.
• the Shape class in addition to providing an implementation of the three virtual functions of the IShape interface, also defines a new virtual function "internal save,” which may be invoked by one of the implementations of the other virtual functions.
• the Shape class also has defined two integer data members, x and y.
• Typical C++ compilers generate virtual function tables to support the invocation of virtual functions.
• a C++ compiler When an object for a class is instantiated, such a C++ compiler generates a data structure that contains the data members of the object and that contains a pointer to a virtual function table.
• the virtual function table contains the address of each virtual function defined for the class.
• Figure 1 illustrates a sample object layout for an object of the Shape class.
• the object data structure 101 contains a pointer to a virtual function table and the data members x and y.
• the virtual function table 102 contains an entry for each virtual function. Each entry contains the address of the corresponding virtual function.
• the first entry in the virtual function table contains the address of the draw function 103.
• the order of the references in the virtual function table is the same as defined in the inherited interface even though the Shape class specifies these three functions in a different order. In particular, the reference to the draw function is first, followed by the references to the save and clear functions.
• the C++ compiler generates code to invoke virtual functions indirectly through the virtual function table.
• the following is C++ code for invoking a virtual function.:
• Shape* pShape new Shape; pShape->save();
• the pointer pShape points to an object in memory that is of the Shape class.
• the compiler When compiling this invocation of the virtual function, the compiler generates code to retrieve the address of the virtual function table from the object, to add to the retrieved address the offset of the entry in the virtual function table that contains the address of the function, and to then invoke the function at that calculated address.
• a routine that uses an implementation may define a formal argument that is a pointer to the IShape interface.
• the developer of the routine can be unaware that the implementation is actually the Shape class.
• a program that invokes the routine would type cast a pointer to the object of the Shape class to a pointer to the IShape interface. So long as the pointer points to a location that contains the address of the virtual function table and the virtual function table contains the entries in the specified order, the invoked routine can correctly access the virtual functions defined by the IShape interface:
• class Almp A virtual void Al () ⁇ ... ⁇ ; virtual void A2Q ⁇ ... ⁇ ;
• classes A and B are interfaces.
• Interface A defines virtual function Al
• interface B defines virtual function Bl.
• Class Almp is an implementation of interface A and defines a new virtual function A2.
• Class Blmp is an implementation of interface B that inherits the implementation of interface A, which is class Almp.
• class Blmp inherits multiple classes: class Almp and interface B.
• Some C++ compilers have the option of merging the virtual function tables of multiple base classes into a single virtual function table in the derived class or of generating separate virtual function tables for each base class.
• One difficulty arises if the virtual function tables of the base classes are merged in the derived class.
• Figure 2 illustrates the difficulty when the virtual function tables are merged.
• the object layouts 201 and 202 illustrate the order of the virtual functions within the virtual function tables. (Since interfaces A and B are abstract classes, objects of these classes cannot actually be instantiated.) To allow type casting as described above, an implementation of interface B needs to provide a virtual function table with entries in the same order as shown in object layout 202, that is with the entry for virtual function (0 Al followed immediately by the entry for virtual function Bl.
• the virtual function table of class Ahnp is shown by object layout 203.
• Object layout 204 illustrates the virtual function table for class Blmp when the virtual function tables are merged.
• This virtual function table for class Blmp illustrates the order of the entries to be virtual functions Al, A2, and Bl. If a pointer to an object of class Almp is type cast to a pointer to interface B, then the virtual function table would not have the entries in the order as specified by the interface B. In particular, the entry for virtual function Al is not immediately followed by the entry for virtual function Bl.
• a C++ compiler could have reordered in entries in the virtual function table within object layout 204 to be virtual functions Al, Bl, and A2. In which case, the type casting for interface B would work. However, the type casting from a pointer to a class Blmp object to a class Almp object would be incorrect because the class Almp defines that the entry for virtual function Al is immediately followed by the entry for virtual function A2. Thus, a C++ compiler cannot define a single virtual function table that satisfies the virtual function table ordering of both interface B and class Almp.
• Figure 3 illustrates the object layouts with separate virtual function tables.
• the object layout 304 for class Blmp has two virtual function tables.
• the first virtual function table has the order of entries to be virtual functions Al and A2, which is consistent with the ordering for class Almp.
• the second virtual function table has the order of entries to be virtual functions Al and Bl, which is consistent with the ordering for interface B.
• the difficulty arises because the developer of class Blmp, who wants to reuse the implementation of interface A, which is class Almp, must provide an implementation for each virtual function of interface A within class Blmp. (These multiple implementations can be avoided by virtually inheriting interface A.
• Class Blmp Almp, B ⁇ virtual void Bl() ⁇ ... ⁇ ; virtual void Al() ⁇ return AImp::Al() ⁇ ⁇
• virtual fimction Al invokes the implementation of virtual function A 1 in the class Almp.
• this implementation is straightforward, problems arise when interface A is changed. For example, if a new virtual function A3 is added to interface A, then the developer of the class Blmp would need to change the class definition to include an implementation of the new virtual function A3.
• the changing of the class definition in this example may not be difficult, the changing of class definitions in systems that use complex inheritance hierarchies and many virtual functions can present difficulties. It would be desirable to have a technique which would avoid the difficulties of having to change class definitions when a new virtual function is added to an interface.
• a forwarding system adds to the class for each virtual fimction a forwarding implementation of that virtual function.
• the forwarding implementation forwards its invocation to the implementation of that the virtual function in the implementing class.
• the forwarding system implements a special forwarding instruction that specifies the interface and implementing class. A developer of a class that inherits the interface and the implementing class inserts the forwarding instruction into the class definition.
• the forwarding system When the forwarding system encounters such an instruction during compilation of the class definition, the forwarding system provides an implementation of each virtual fimction of the interface that forwards its invocation to a corresponding virtual function in the implementing class. The forwarding system also forwards virtual functions of any direct or indirect base interface of the interface to the implementing class.
• Figure 1 illustrates a sample object layout for an object of the Shape class.
• Figure 2 illustrates the difficulty when the virtual function tables are merged.
• Figure 3 illustrates the object layouts with separate virtual function tables.
• Figure 4 is a block diagram of an example implementation of the forwarding system.
• Figure 5 is a block diagram illustrating a computer system for practicing the forwarding system.
• Figure 6 is a flow diagram illustrating an example implementation of a routine to automatically add forwarding macros to interface definitions.
• Embodiments of the present technology provide a method and system for automatically generating implementations of virtual fimctions of interfaces.
• the system generates the implementations so that each virtual function forwards its invocation to a virtual function that provides an implementation.
• the forwarding system implements a special forwarding instruction that specifies an interface and an implementing class.
• a developer of a class that inherits the interface and the implementing class inserts the forwarding instruction into the class definition.
• the forwarding system provides an implementation of each virtual function of the interface that forwards its invocation to a corresponding virtual function in the implementing class.
• the forwarding system also forwards virtual fimctions of any direct or indirect base interface of the interface to the implementing class.
• the forwarding system automatically detects that no implementation has been provided for the interface and inserts a forwarding implementation to the implementing class.
• the forwarding system is implemented by adapting a compiler to recognize a special forwarding instruction and to automatically insert and implementation of the virtual functions.
• the forwarding system may be implemented using standard macros that are preprocessed by a compiler, such as a C++ compiler.
• the macro implementation of the forwarding system is referred to as the "macro system.”
• the macro system defines a forwarding macro for each interface that provides an implementation of each virtual function that forwards the invocation of the virtual function to an implementation of that virtual function in a class whose name is passed as a parameter to the macro. The following illustrates the forwarding macro that is defined for class A: class A
• the "#define” indicates that a macro is being defined, the "SforwardATo” is the name of the macro, and the "interface” is the name of a parameter that is passed when the macro is expanded.
• the body of the macro is "virtual void Al() ⁇ return interface##::Al() ⁇ ;” where "interface##” indicates that the passed parameter is to be substituted.
• the macro definition is terminated by a statement that does not end with a " ⁇ ". In other words, a " ⁇ " at the end of a statement within the macro indicates that the macro continues onto the next line.
• the parameter such as "Imp”
• the result is: virtual void Al() ⁇ return Imp::Al() ⁇ ;
• interface B which is class Blmp
• an implementation of virtual function Al is provided that forwards its invocation to the implementation of class Almp.
• class Blmp Almp, B ⁇ virtual void Bl () ⁇ ... ⁇ ; $forwardATo(AImp)
• class Blmp Almp
• the SforwardATo macro is redefined to add statements that are forwarding implementations of the new virtual functions. Because class Blmp calls that macro, when the macro is expanded, the definition of class Blmp will include forwarding implementations of the new virtual functions. Thus, once a developer adds a forwarding macro to class Blmp modifications to interface A are automatically reflected in class Blmp.
• forwarding macro needs to include statements that will generate forwarding implementations of each virtual function in inherited interfaces.
• An implementing class that inherits interface B need only expand the forwarding macro for interface B, which automatically expands the forwarding macro for interface A.
• interface C which is class Clmp, that uses the forwarding macro of interface B: class C : B
• class Clmp class Clmp : Blmp, C ⁇ virtual void Cl () ⁇ ... ⁇ ; virtual void Al() ⁇ return BImp::Al() ⁇ ; virtual void Bl() ⁇ return BImp::Bl() ⁇ ;
• a difficulty with the naming convention of these forwarding macros is that an implementation needs to know of any directly inherited interface of its directly inherited interface.
• interface C which is class Clmp
• interface B is directly inherited by interface C so that the appropriate forwarding macro, "SforwardBTo," can be used.
• One embodiment of the macro system overcomes this difficulty by defining an additional parent class forwarding macro for each interface that inherits an interface.
• the parent class forwarding macro has a name that is based solely on the interface for which it is defined, but calls the forwarding macro for its directly inherited interfaces.
• the following definition of interface B illustrates the parent class forwarding macro: class B : A
• the parent class forwarding macro is "SforwardBParentClassTo.” This macro calls the forwarding macro for its inherited interface A.
• An implementing class can call the parent class forwarding macro of its directly inherited interface rather than calling the forwarding macro of an indirectly inherited interface. Thus, the implementation need not be aware that an inherited interface happens to inherit another interface.
• class Blmp Almp, B ⁇ virtual void Bl() ⁇ . . ⁇ ; $forwardBParentClassTo(AImp)
• class Blmp Almp, B
• any interface regardless of whether it currently inherits another interface can provide an implementation of the parent class forwarding macro. If the interface does not currently inherit another interface, then the parent class forwarding macro would be defined to be empty. Thus, when such a parent class forwarding macro is expanded, no statements are inserted into the calling class definition and the expansion would have no effect. If, however, the interface is eventually changed to inherit another interface, then the parent class forwarding macro would be redefined to call the forwarding macro of the inherited interface. The change in the parent class forwarding macro would automatically the reflected when the parent class forwarding macro is expanded in the calling class definition.
• FIG. 4 is a block diagram of an example implementation of the forwarding system.
• the forwarding system may be implemented as part of a compiler or as a preprocessor to a compiler.
• the process forwarding instruction routine is invoked when the forwarding system encounters a special forwarding instruction, which specifies an interface and an implementing class or automatically detects such a situation.
• the routine inserts, into the class definition that inherits the interface and that inherits the implementing class, a forwarding implementation for each virtual function of the interface.
• the routine then recursively calls itself to insert forwarding implementations for virtual functions of any indirectly inherited interfaces of the interface.
• the routine loops inserting forwarding implementations for each virtual function of the interface.
• step 401 the routine selects the next virtual function of the interface.
• step 402 if all the virtual functions have aheady been selected, then the routine continues at step 404, else the routine continues at step 403.
• step 403 the routine inserts a forwarding implementation of the selected virtual function that forwards its invocation to the implementing class.
• step 404 if the interface has an inherited interface (i.e., a base interface), then the routine continues at step 405, else the routine returns.
• step 405 the routine recursively invokes the process forwarding instruction routine passing the base interface and the implementing class. The routine then returns.
• FIG. 5 is a block diagram illustrating a computer system for practicing the forwarding system.
• the computer system 500 includes a central processing unit 501, I/O devices 502, and memory 503.
• the I/O devices may include computer readable media, such as a hard disk or a flexible disk, on which components of the forwarding system may be stored.
• the forwarding system that is stored in memory is the macro system.
• the forwarding system comprises an add forwarding macro component 505.
• the add forwarding macro component inputs interface definitions 504 and outputs modified interface definitions 506.
• the add forwarding macro component inserts the forwarding macro and the parent class forwarding macro into the interface definitions.
• the compiler preprocessor 508 inputs the modified interface definitions 506 and class definitions that have calls to the macros 507.
• FIG. 6 is a flow diagram illustrating an example implementation of a routine to automatically add forwarding macros and parent class forwarding macros to interface definitions.
• This routine is passed an interface definition and inserts macro definitions for the forwarding macro and the parent class forwarding macro.
• the routine inserts a statement "#define $forward ⁇ class>To(interface) ⁇ " into the interface definition. This statement starts the definition of the forwarding macro. The " ⁇ class>" is replaced by the name of the interface.
• step 602 if the interface inherits a base interface, then the routine continues that step 603, else the routine continues that step 604.
• step 603 the routine inserts the statement "$forward ⁇ baseclass>To(interface); ⁇ ".
• the " ⁇ baseclass>” is replaced by the name of the inherited interface.
• This statement calls the forwarding macro of the inherited interface.
• steps 604-606 the routine loops adding forwarding implementations for each virtual function of the interface.
• step 604 the routine selects the next virtual function.
• step 605 if all the virtual functions have aheady been selected, then the routine continues at step 607, else the routine continues at step 606.
• step 606 the routine adds the forwarding implementation of the selected virtual function and loops to step 606 to select the next virtual function.
• step 607 the routine adds a termination for the macro definition. The termination may be accomplished by inserting a blank line.
• step 608 the routine adds the statement "#define $forward ⁇ class>ParentClassTo(interface) ⁇ ". This statement defines the parent class forwarding macro.
• step 609 if the interface inherits a base interface, then the routine continues its step 610, else the routine continues that step 611.
• step 610 the routine adds the statement "$forward ⁇ baseclass>To(interface) ⁇ ". This statement calls the forwarding macro of the base interface. If, however, the interface inherits no base interface, then the parent class forwarding macro is empty.
• step 611 the routine adds a termination of the macro definition and completes.

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• Computer And Data Communications (AREA)
• Stored Programmes (AREA)
• Circuit Arrangement For Electric Light Sources In General (AREA)
• User Interface Of Digital Computer (AREA)
• Two-Way Televisions, Distribution Of Moving Picture Or The Like (AREA)
• Debugging And Monitoring (AREA)
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• Diaphragms For Electromechanical Transducers (AREA)
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• Information Transfer Between Computers (AREA)
• Discharge-Lamp Control Circuits And Pulse- Feed Circuits (AREA)
• Input From Keyboards Or The Like (AREA)
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• Information Retrieval, Db Structures And Fs Structures Therefor (AREA)
• Vehicle Interior And Exterior Ornaments, Soundproofing, And Insulation (AREA)
• Inks, Pencil-Leads, Or Crayons (AREA)
• Heat Sensitive Colour Forming Recording (AREA)
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  • 2000-02-03 AU AU28708/00A patent/AU2870800A/en not_active Abandoned
  • 2000-02-03 EP EP00911714A patent/EP1157333B1/fr not_active Expired - Lifetime
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