US20060026200A1 - Method and system for shared object data member zones - Google Patents
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- US20060026200A1 US20060026200A1 US11/187,199 US18719905A US2006026200A1 US 20060026200 A1 US20060026200 A1 US 20060026200A1 US 18719905 A US18719905 A US 18719905A US 2006026200 A1 US2006026200 A1 US 2006026200A1
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- G—PHYSICS
- G06—COMPUTING; CALCULATING OR COUNTING
- G06F—ELECTRIC DIGITAL DATA PROCESSING
- G06F12/00—Accessing, addressing or allocating within memory systems or architectures
- G06F12/02—Addressing or allocation; Relocation
- G06F12/08—Addressing or allocation; Relocation in hierarchically structured memory systems, e.g. virtual memory systems
- G06F12/10—Address translation
- G06F12/1081—Address translation for peripheral access to main memory, e.g. direct memory access [DMA]
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- G—PHYSICS
- G06—COMPUTING; CALCULATING OR COUNTING
- G06F—ELECTRIC DIGITAL DATA PROCESSING
- G06F12/00—Accessing, addressing or allocating within memory systems or architectures
- G06F12/02—Addressing or allocation; Relocation
- G06F12/08—Addressing or allocation; Relocation in hierarchically structured memory systems, e.g. virtual memory systems
- G06F12/0802—Addressing of a memory level in which the access to the desired data or data block requires associative addressing means, e.g. caches
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- 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
- G06F9/30—Arrangements for executing machine instructions, e.g. instruction decode
- G06F9/3017—Runtime instruction translation, e.g. macros
- G06F9/30174—Runtime instruction translation, e.g. macros for non-native instruction set, e.g. Javabyte, legacy code
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- 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
- G06F9/455—Emulation; Interpretation; Software simulation, e.g. virtualisation or emulation of application or operating system execution engines
- G06F9/45504—Abstract machines for programme code execution, e.g. Java virtual machine [JVM], interpreters, emulators
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- G—PHYSICS
- G06—COMPUTING; CALCULATING OR COUNTING
- G06F—ELECTRIC DIGITAL DATA PROCESSING
- G06F2212/00—Indexing scheme relating to accessing, addressing or allocation within memory systems or architectures
- G06F2212/60—Details of cache memory
- G06F2212/601—Reconfiguration of cache memory
- G06F2212/6012—Reconfiguration of cache memory of operating mode, e.g. cache mode or local memory mode
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02D—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN INFORMATION AND COMMUNICATION TECHNOLOGIES [ICT], I.E. INFORMATION AND COMMUNICATION TECHNOLOGIES AIMING AT THE REDUCTION OF THEIR OWN ENERGY USE
- Y02D10/00—Energy efficient computing, e.g. low power processors, power management or thermal management
Definitions
- objects are generally allocated as individual entities. That is, each object has its own memory space with private data that is not shared with or accessible by any other object.
- objects there are many applications that duplicate subsets of data between objects, such as network protocol management, multimedia decoding, sound generation, network packet encoding and decoding, and audio/video streaming. Enhancements to improve sharing of duplicate data between objects in object-oriented applications are desirable.
- Some embodiments provide a method for sharing data member zones of objects in a software application executing on a processor.
- the method includes instantiating a first object comprising a first plurality of data members and instantiating a second object comprising a second plurality of data members.
- the method further includes defining a first shared data member zone comprising a first portion of the first plurality of data members and a second portion of the second plurality of data members, and modifying a value of a data member in the first portion, the modification making the value available to a read access of a corresponding data member in the second portion.
- FIGS. 2-6 illustrate methods for shared object data zones in accordance with embodiments of the invention.
- FIG. 7 depicts an illustrative embodiment of the system described herein.
- the subject matter disclosed herein is directed to methods that provide shared object data zones in object-oriented languages.
- two or more objects may share one or more data zones.
- a method provided by a virtual machine or run time implementing the language is called to define the shared zones between pairs of objects.
- the virtual machine is responsible for maintaining consistency between the shared zones, if such consistency maintenance is needed.
- the embodiments described herein are directed to Java and a Java Virtual Machine implemented on a Java processor referred to herein as a Java Stack Machine. These embodiments should not be construed as limitations of the scope of this disclosure.
- the methods described herein are applicable to other object-oriented languages such as C++ and Smalltalk, and to other processors including general purpose processors.
- FIG. 1 shows a system 100 in accordance with embodiments of the invention.
- the system 100 may comprise at least two processors 102 and 104 .
- Processor 102 may be referred to for purposes of this disclosure as a Java Stack Machine (“JSM”) and processor 104 may be referred to as a Main Processor Unit (“MPU”).
- the system 100 may also comprise memory 106 , and a display 114 coupled to both the JSM 102 and MPU 104 via one or more busses 122 .
- At least a portion of the memory 106 may be shared by both processors, and if desired, other portions of the memory 106 may be designated as private to one processor or the other.
- Other components such as disk drives and controllers (not specifically shown) may be included as desired for various applications.
- the system 100 also comprises a Java Virtual Machine (“JVM”) 108 , compiler 110 , Java APIs 120 , Java native APIs 124 , and Java applications 118 .
- the JVM may comprise a class loader, bytecode verifier, garbage collector, and a bytecode interpreter loop to interpret the bytecodes that are not executed on the JSM processor 102 .
- the Java applications 118 are written in Java language source code and may comprise references to one or more classes of the Java Application Program Interfaces (“APIs”) 120 and the Java native APIs 124 .
- the Java native APIs 124 comprises interfaces to classes and methods implemented in other languages such as C++, C or assembler.
- the MPU 104 may also host an operating system (“O/S”)(not specifically shown) which performs various functions such as system memory management, the system task management that schedules the software aspects of the JVM 108 and most or all other native tasks running on the system, management of the display 114 , and receiving input from input devices (e.g., device 116 ).
- O/S operating system
- Java code may be used to perform any one of a variety of applications such as multimedia, games or web based applications in the system 100 , while non-Java code, which may comprise the O/S and other native applications, may still run on the system on the MPU 104 .
- Java bytecodes perform stack-based operations. For example, an “IADD” (integer add) Java opcode pops two integers off the top of the stack, adds them together, and pushes the sum back on the stack.
- a “simple” opcode is one in which the JSM 102 may perform an immediate operation either in a single cycle (e.g., an IADD opcode) or in several cycles (e.g., “DUP2_X2”).
- a “complex” opcode is one in which several memory accesses may be required to be made within the JVM data structure for various verifications (e.g., NULL pointer, array boundaries).
- a JSM processor 102 in accordance with embodiments of the invention may execute, in addition to the Java bytecodes, a second instruction set other than JavaTM bytecodes.
- the second instruction set may comprise register-based and memory-based operations rather than stack-based operations.
- This second instruction set complements the Java instruction set and, accordingly, may be referred to as a complementary instruction set architecture (“C-ISA”).
- C-ISA complementary instruction set architecture
- complementary it is meant that some complex Java bytecodes may be replaced by a “micro-sequence” comprising C-ISA instructions.
- the execution of JavaTM code may thus be made more efficient and run faster by replacing some opcodes with more efficient micro-sequences of C-ISA instructions.
- the compiler 110 may scan a series of Java bytes codes and replace one or more of such bytecodes with an optimized code segment mixing CISA and bytecodes and which is capable of more efficiently performing the function(s) performed by the initial group of Java bytecodes. In at least this way, Java execution may be accelerated by the JSM 102 .
- the JVM 108 comprises a Java native method, referred to herein as ShareObjectZone, that is used to define data member zones shared between two Java objects.
- This Java native method comprises five parameters: the two objects, e.g., object A 200 and object B 202 , which share a data member zone 204 , the base of the shared data member zone of object A 200 , the base of the shared data member zone of object B 202 , and the size of the shared data member zone 204 .
- the call to ShareObjectZone must be done after the sharing objects are instantiated and before any of the sharing objects are used. As will be explained in more detail in reference to FIGS. 4 and 5 below, once the shared data member zone 204 is defined, any changes made to the shared data member zone 204 of Object A 200 may be automatically made available in the shared data member zone of Object B 202 and vice versa.
- Data member zones may be shared between two or more objects and may be layered. For example, as illustrated in FIG. 3 , Object A 300 and Object B 302 share a data member zone 306 , and Object A 300 , Object B 302 , and Object C 304 all share a data member zone 308 . Note that shared data member zone 308 is part of shared data member zone 306 , and any changes made in shared data member zone 308 are automatically made in shared data member zone 306 . Any changes made to the shared data member zone 308 in any one of three objects 300 , 302 , 304 may be automatically made available in the shared data member zones of the other two objects. In some embodiments, multiple calls to ShareObjectZone are used to define the sharing of data member zone 306 and data member zone 308 between the pairs of objects.
- the JVM 108 performs any necessary operations to maintain consistency between objects sharing data member zones. How this consistency is maintained depends on the internal object representation used by the JVM 108 , and in some embodiments, a consistency policy defined for the sharing objects.
- each Java object is comprised of a small fixed-sized group of metadata fields (sometimes referred to as a header), and some number of instance fields, i.e., data members.
- the data members of an object are allocated contiguously in memory and may be accessed via fixed offsets from the beginning of the contiguous memory space.
- the metadata for an object is allocated in a separate area of memory apart from the data members.
- the metadata comprises a reference or pointer to the memory containing the data members.
- the metadata for an object is allocated in memory contiguously with the data members, either preceding or following the data members, and no pointer is needed in the metadata.
- FIG. 4 illustrates a method for sharing data member zones between objects when the metadata for an object is allocated in a separate area of memory.
- the JVM 108 allocates the metadata 410 , 412 , 414 , for Object A 300 , Object B 302 , and Object C 304 in memory apart from the memory containing the data members of the objects.
- Each of the metadata blocks 410 , 412 , 414 contains a pointer or reference to the block of memory containing the data members of the object.
- the pointer to the data member memory of Object B 302 contained in the metadata of Object B 412 is changed to point to the beginning of the shared data member zone 306 in the memory allocated for Object A 300 .
- the pointer to the data member memory of Object C 304 contained in the metadata of Object C 414 is changed to point to the beginning of the shared data member zone 308 in the memory allocated for Object A 300 .
- the shared data member zones 306 and 308 are in the same physical memory and no additional work is required of the JVM 108 to maintain consistency between the shared data members of the three objects. For example, if a data member of shared data member zone 308 is changed by a Java field access in Object C 304 , the change is actually made in the physical memory of Object A 300 . If a read of the corresponding data member of the shared data member zone 308 is performed by a Java field access in Object B 302 , the value is read from the physical memory allocated to Object A 300 .
- the garbage collector may need to be augmented to recognize that multiple objects have references to a shared data member zone. For example, since Object B 302 and Object C 304 access the physical memory allocated to Object A 300 , the garbage collector should not free up the memory allocated to Object A 300 unless all three objects are no longer live. Therefore, if Object A 300 is reachable from the root context of the garbage collector, Object B 302 and Object 304 must also be reachable from that root context.
- the JVM 108 may maintain a simple table of the shared data member zones to be used by the garbage collector.
- FIG. 5 illustrates a method for sharing data member zones between objects when the metadata for an object is allocated contiguously with the data members of the object.
- the JVM 108 allocates the metadata 410 , 412 , 414 , for Object A 300 , Object B 302 and Object C 304 in memory contiguous to the data members of the objects.
- Object A 300 and Object B 302 each have separate physical memory representations of the shared data memory zone 306
- Object A 300 , Object B 302 , and Object C 304 each have separate physical memory representations of the shared data memory zone 308 .
- the JVM 108 is configured to maintain consistency between these separate physical memory representations.
- the JVM 108 each time a data member in shared data member zone 306 or shared data member zone 308 is modified by an access in one of the sharing objects, the JVM 108 automatically copies, i.e., propagates, the modification to the corresponding data members in the other sharing objects. For example, if a data member of shared data member zone 308 is changed by a Java field access in Object C 304 , the JVM 108 also changes the corresponding data member in Object B 302 and Object A 300 .
- the JVM 108 provides the capability to specify consistency attributes for shared data member zones rather than automatically performing copies each time a data member in a shared data member zone is changed.
- consistency attributes may also be defined to indicate which changes should be propagated automatically.
- a consistency attribute may be set for an entire shared data member zone.
- a consistency attribute may be set for each data member of a shared data member zone.
- Other embodiments allow, on a per shared data member zone basis, setting a consistency attribute for the entire shared data member zone or for individual data members within the shared data member zone.
- the consistency attribute may be set to indicate whether a change to the shared data member zone or to the shared data member is to be propagated automatically when the change is made or not.
- Some embodiments also comprise a native method, e.g., MakeMySharedZoneConsistent, in the JVM 108 that may be called by a Java application to propagate changes made to a shared data member zone and/or to individual data members in a shared data member zone as needed.
- this native method comprises two parameters, a reference to an object sharing a shared data member zone, and a reference to the base of the shared data member zone in that object to be updated. The native method causes any changes made in the corresponding shared data member zones of other objects to be propagated to the shared data member zone of the referenced object.
- the shared data member zones of the objects have been nested, i.e. all data members of one member of each sharing pair of objects are shared with the other member of the pair.
- all of the data members of Object C 304 are in the shared data member zone 308
- all of the data members of Object B 302 are in shared data member zone 306 .
- FIG. 6 illustrates a method for sharing one or more subsets of data members between objects while keeping other subsets private. As shown in FIG.
- a shared data member zone 618 is defined between Object A 600 and Object B 602
- a shared data member zone 622 is defined between Object A 600 and Object C 604
- a shared data member zone 620 is defined between Object A 600 , Object B 602 , and Object C 604 .
- Object A 600 has private data member zones 614 and 616
- Object B has private data member zones 606 and 608
- Object C has private data member zones 610 and 612 .
- multiple invocations of ShareObjectZone are used to create the various shared data member zones 618 , 620 , 622 .
- the JVM 108 is configured to recognize which subsets of the object data members are private and which are shared. In some embodiments, when a data member in a shared data member zone is changed in one of the sharing objects, the JVM 108 automatically propagates the change to the corresponding shared zone in any other sharing objects. For example, if a data member in the shared data member zone 620 is changed in Object C 604 , the JVM 108 automatically makes the change in the corresponding data members in Object A 600 and Object B 602 . In other embodiments, the JVM 108 provides the capability to specify consistency attributes for shared data member zones rather than automatically performing copies each time a data member in a shared data member zone is changed. Such consistency attributes are described in more detail in reference to FIG. 5 .
- System 100 may be implemented as a mobile device 715 such as that shown in FIG. 7 .
- the mobile device 715 includes an integrated keypad 712 and display 714 .
- the JSM processor 102 and MPU processor 104 and other components may be included in electronics package 710 connected to the keypad 712 , display 714 , and radio frequency (“RF”) circuitry 716 .
- the RF circuitry 716 may be connected to an antenna 718 .
Abstract
Methods, computer-readable media, and systems for sharing duplicate data between objects in object-oriented applications are provided. In some illustrative embodiments, a method for sharing data member zones of objects in a software application executing on a processor is provided. The method includes instantiating a first object comprising a first plurality of data members and instantiating a second object comprising a second plurality of data members. The method further includes defining a first shared data member zone comprising a first portion of the first plurality of data members and a second portion of the second plurality of data members, and modifying a value of a data member in the first portion, the modification making the value available to a read access of a corresponding data member in the second portion.
Description
- This application claims the benefit of European Patent Application No. 04291918.3, filed Jul. 27, 2004, incorporated by reference herein as if reproduced in full below.
- In software applications written in object-oriented languages such as Java™, C++, and Smalltalk, objects are generally allocated as individual entities. That is, each object has its own memory space with private data that is not shared with or accessible by any other object. However, there are many applications that duplicate subsets of data between objects, such as network protocol management, multimedia decoding, sound generation, network packet encoding and decoding, and audio/video streaming. Enhancements to improve sharing of duplicate data between objects in object-oriented applications are desirable.
- Accordingly, there are disclosed herein methods, computer-readable media, and systems for sharing duplicate data between objects in object-oriented applications. Some embodiments provide a method for sharing data member zones of objects in a software application executing on a processor. The method includes instantiating a first object comprising a first plurality of data members and instantiating a second object comprising a second plurality of data members. The method further includes defining a first shared data member zone comprising a first portion of the first plurality of data members and a second portion of the second plurality of data members, and modifying a value of a data member in the first portion, the modification making the value available to a read access of a corresponding data member in the second portion.
- Some embodiments provide a computer-readable medium that stores a software program that when executed by a processor performs the above-described method. Other embodiments provide a system that comprises a processor, an implementation of an object-oriented language that executes on the processor, and a software program that executes on the implementation of the object-oriented language. The software program is configured to perform the above-described method.
- Certain terms are used throughout the following description and claims to refer to particular system components. As one skilled in the art will appreciate, semiconductor companies may refer to a component by different names. This document does not intend to distinguish between components that differ in name but not function. In the following discussion and in the claims, the terms “including” and “comprising” are used in an open-ended fashion, and thus should be interpreted to mean “including, but not limited to . . . ”. Also, the term “couple” or “couples” is intended to mean either an indirect or direct connection. Thus, if a first device couples to a second device, that connection may be through a direct connection, or through an indirect connection via other devices and connections.
- For a more detailed description of the preferred embodiments of the present invention, reference will now be made to the accompanying drawings, wherein:
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FIG. 1 shows a diagram of a system in accordance with embodiments of the invention; -
FIGS. 2-6 illustrate methods for shared object data zones in accordance with embodiments of the invention; and -
FIG. 7 depicts an illustrative embodiment of the system described herein. - The following discussion is directed to various embodiments of the invention. Although one or more of these embodiments may be preferred, the embodiments disclosed should not be interpreted, or otherwise used, as limiting the scope of the disclosure, unless otherwise specified. In addition, one skilled in the art will understand that the following description has broad application, and the discussion of any embodiments is meant only to be exemplary of those embodiments, and not intended to intimate that the scope of the disclosure, is limited to those embodiments.
- The subject matter disclosed herein is directed to methods that provide shared object data zones in object-oriented languages. In embodiments of these methods, two or more objects may share one or more data zones. After the objects are instantiated in memory, a method provided by a virtual machine or run time implementing the language is called to define the shared zones between pairs of objects. Once the shared zones are defined, the virtual machine is responsible for maintaining consistency between the shared zones, if such consistency maintenance is needed. Merely by way of example, the embodiments described herein are directed to Java and a Java Virtual Machine implemented on a Java processor referred to herein as a Java Stack Machine. These embodiments should not be construed as limitations of the scope of this disclosure. The methods described herein are applicable to other object-oriented languages such as C++ and Smalltalk, and to other processors including general purpose processors.
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FIG. 1 shows asystem 100 in accordance with embodiments of the invention. As shown, thesystem 100 may comprise at least twoprocessors Processor 102 may be referred to for purposes of this disclosure as a Java Stack Machine (“JSM”) andprocessor 104 may be referred to as a Main Processor Unit (“MPU”). Thesystem 100 may also comprisememory 106, and adisplay 114 coupled to both the JSM 102 and MPU 104 via one ormore busses 122. At least a portion of thememory 106 may be shared by both processors, and if desired, other portions of thememory 106 may be designated as private to one processor or the other. Other components such as disk drives and controllers (not specifically shown) may be included as desired for various applications. - The
system 100 also comprises a Java Virtual Machine (“JVM”) 108,compiler 110, JavaAPIs 120, Javanative APIs 124, and Javaapplications 118. The JVM may comprise a class loader, bytecode verifier, garbage collector, and a bytecode interpreter loop to interpret the bytecodes that are not executed on the JSMprocessor 102. The Javaapplications 118 are written in Java language source code and may comprise references to one or more classes of the Java Application Program Interfaces (“APIs”) 120 and the Javanative APIs 124. The Javanative APIs 124 comprises interfaces to classes and methods implemented in other languages such as C++, C or assembler. - The Java source code is converted or compiled to a series of
bytecodes 112, with each individual one of the bytecodes referred to as an “opcode.”Bytecodes 112 are provided to the JVM 108, possibly compiled bycompiler 110, and provided to the JSM 102 and/or MPU 104 for execution. In some embodiments, the JSM 102 may execute at least some Java bytecodes directly. When appropriate, however, the JVM 108 may also request the MPU 104 to execute one or more Java bytecodes not executed or executable by the JSM 102. In addition to executing compiled Java bytecodes, the MPU 104 also may execute non-Java instructions. - The MPU 104 may also host an operating system (“O/S”)(not specifically shown) which performs various functions such as system memory management, the system task management that schedules the software aspects of the
JVM 108 and most or all other native tasks running on the system, management of thedisplay 114, and receiving input from input devices (e.g., device 116). Java code may be used to perform any one of a variety of applications such as multimedia, games or web based applications in thesystem 100, while non-Java code, which may comprise the O/S and other native applications, may still run on the system on theMPU 104. - Java bytecodes perform stack-based operations. For example, an “IADD” (integer add) Java opcode pops two integers off the top of the stack, adds them together, and pushes the sum back on the stack. A “simple” opcode is one in which the
JSM 102 may perform an immediate operation either in a single cycle (e.g., an IADD opcode) or in several cycles (e.g., “DUP2_X2”). A “complex” opcode is one in which several memory accesses may be required to be made within the JVM data structure for various verifications (e.g., NULL pointer, array boundaries). - A JSM
processor 102 in accordance with embodiments of the invention may execute, in addition to the Java bytecodes, a second instruction set other than Java™ bytecodes. In some embodiments, the second instruction set may comprise register-based and memory-based operations rather than stack-based operations. This second instruction set complements the Java instruction set and, accordingly, may be referred to as a complementary instruction set architecture (“C-ISA”). By complementary, it is meant that some complex Java bytecodes may be replaced by a “micro-sequence” comprising C-ISA instructions. The execution of Java™ code may thus be made more efficient and run faster by replacing some opcodes with more efficient micro-sequences of C-ISA instructions. For example, thecompiler 110 may scan a series of Java bytes codes and replace one or more of such bytecodes with an optimized code segment mixing CISA and bytecodes and which is capable of more efficiently performing the function(s) performed by the initial group of Java bytecodes. In at least this way, Java execution may be accelerated by theJSM 102. - In some embodiments, the
JVM 108 provides a method for sharing data member zones between two or more Java objects. As used herein, a data member is a field or instance variable of a Java class, and a data member zone is one or more data members allocated in contiguous memory locations in a Java object. Each Java object may have its own view of the shared data member zone. There is no requirement that the names or types of the data members in the shared data member zone be the same in each object. The only requirement is that the shared data member zone must be the same physical size in each object. For example, as illustrated inFIG. 2 ,Object A 200 andObject B 202 may share adata member zone 204. Object A 200 may define the shareddata member zone 204 as an array of four integers and those data members are accessed using array operations.Object B 202 may define the shareddata member zone 204 as four integer fields and those data members are accessed using Java field operations. - In some embodiments, the
JVM 108 comprises a Java native method, referred to herein as ShareObjectZone, that is used to define data member zones shared between two Java objects. This Java native method comprises five parameters: the two objects, e.g.,object A 200 andobject B 202, which share adata member zone 204, the base of the shared data member zone ofobject A 200, the base of the shared data member zone ofobject B 202, and the size of the shareddata member zone 204. In at least one embodiment, the call to ShareObjectZone must be done after the sharing objects are instantiated and before any of the sharing objects are used. As will be explained in more detail in reference toFIGS. 4 and 5 below, once the shareddata member zone 204 is defined, any changes made to the shareddata member zone 204 ofObject A 200 may be automatically made available in the shared data member zone ofObject B 202 and vice versa. - Data member zones may be shared between two or more objects and may be layered. For example, as illustrated in
FIG. 3 ,Object A 300 andObject B 302 share adata member zone 306, andObject A 300,Object B 302, andObject C 304 all share adata member zone 308. Note that shareddata member zone 308 is part of shareddata member zone 306, and any changes made in shareddata member zone 308 are automatically made in shareddata member zone 306. Any changes made to the shareddata member zone 308 in any one of threeobjects data member zone 306 anddata member zone 308 between the pairs of objects. - The
JVM 108 performs any necessary operations to maintain consistency between objects sharing data member zones. How this consistency is maintained depends on the internal object representation used by theJVM 108, and in some embodiments, a consistency policy defined for the sharing objects. In theJVM 108, each Java object is comprised of a small fixed-sized group of metadata fields (sometimes referred to as a header), and some number of instance fields, i.e., data members. The data members of an object are allocated contiguously in memory and may be accessed via fixed offsets from the beginning of the contiguous memory space. In some embodiments, the metadata for an object is allocated in a separate area of memory apart from the data members. In such embodiments, the metadata comprises a reference or pointer to the memory containing the data members. In other embodiments, the metadata for an object is allocated in memory contiguously with the data members, either preceding or following the data members, and no pointer is needed in the metadata. -
FIG. 4 illustrates a method for sharing data member zones between objects when the metadata for an object is allocated in a separate area of memory. In embodiments such as that illustrated byFIG. 4 , theJVM 108 allocates themetadata Object A 300,Object B 302, andObject C 304 in memory apart from the memory containing the data members of the objects. Each of the metadata blocks 410, 412, 414 contains a pointer or reference to the block of memory containing the data members of the object. To create the shareddata member zone 306 betweenObject A 300 andObject B 302, the pointer to the data member memory ofObject B 302 contained in the metadata ofObject B 412 is changed to point to the beginning of the shareddata member zone 306 in the memory allocated forObject A 300. Similarly, to define the sharedmemory data zone 308, the pointer to the data member memory ofObject C 304 contained in the metadata ofObject C 414 is changed to point to the beginning of the shareddata member zone 308 in the memory allocated forObject A 300. - In these embodiments, the shared
data member zones JVM 108 to maintain consistency between the shared data members of the three objects. For example, if a data member of shareddata member zone 308 is changed by a Java field access inObject C 304, the change is actually made in the physical memory ofObject A 300. If a read of the corresponding data member of the shareddata member zone 308 is performed by a Java field access inObject B 302, the value is read from the physical memory allocated toObject A 300. - In addition, in these embodiments, the garbage collector may need to be augmented to recognize that multiple objects have references to a shared data member zone. For example, since
Object B 302 andObject C 304 access the physical memory allocated toObject A 300, the garbage collector should not free up the memory allocated toObject A 300 unless all three objects are no longer live. Therefore, ifObject A 300 is reachable from the root context of the garbage collector,Object B 302 andObject 304 must also be reachable from that root context. In some embodiments, theJVM 108 may maintain a simple table of the shared data member zones to be used by the garbage collector. -
FIG. 5 illustrates a method for sharing data member zones between objects when the metadata for an object is allocated contiguously with the data members of the object. In embodiments such as that illustrated byFIG. 5 , theJVM 108 allocates themetadata Object A 300,Object B 302 andObject C 304 in memory contiguous to the data members of the objects.Object A 300 andObject B 302 each have separate physical memory representations of the shareddata memory zone 306, andObject A 300,Object B 302, andObject C 304 each have separate physical memory representations of the shareddata memory zone 308. In these embodiments, theJVM 108 is configured to maintain consistency between these separate physical memory representations. In some embodiments, each time a data member in shareddata member zone 306 or shareddata member zone 308 is modified by an access in one of the sharing objects, theJVM 108 automatically copies, i.e., propagates, the modification to the corresponding data members in the other sharing objects. For example, if a data member of shareddata member zone 308 is changed by a Java field access inObject C 304, theJVM 108 also changes the corresponding data member inObject B 302 andObject A 300. - In various embodiments, the
JVM 108 provides the capability to specify consistency attributes for shared data member zones rather than automatically performing copies each time a data member in a shared data member zone is changed. In such embodiments, when a shareddata member zone - Some embodiments also comprise a native method, e.g., MakeMySharedZoneConsistent, in the
JVM 108 that may be called by a Java application to propagate changes made to a shared data member zone and/or to individual data members in a shared data member zone as needed. In at least one embodiment, this native method comprises two parameters, a reference to an object sharing a shared data member zone, and a reference to the base of the shared data member zone in that object to be updated. The native method causes any changes made in the corresponding shared data member zones of other objects to be propagated to the shared data member zone of the referenced object. - A Java application may use consistency attributes and/or the Java native method to set up a consistency policy that matches the application's use of a shared data member zone. For example, when shared
data member zone 308 is defined, the defining Java application may specify that all modifications made to the shareddata member zone 308 made inObject C 304 should be automatically propagated to the shared zones inObject A 300 andObject B 302, but no changes made in the shareddata memory zone 308 inObject A 300 should be automatically propagated to the shared zones inObject B 302 orObject C 304. If the Java application periodically needs to have the changes made in the shareddata memory zone 308 inObject A 300 propagated to the other sharing objects, the Java application may invoke the Java native method as needed to perform the copying. - In the previous embodiments described herein, the shared data member zones of the objects have been nested, i.e. all data members of one member of each sharing pair of objects are shared with the other member of the pair. For example, all of the data members of
Object C 304 are in the shareddata member zone 308, and all of the data members ofObject B 302 are in shareddata member zone 306.FIG. 6 illustrates a method for sharing one or more subsets of data members between objects while keeping other subsets private. As shown inFIG. 6 , a shareddata member zone 618 is defined betweenObject A 600 andObject B 602, a shareddata member zone 622 is defined betweenObject A 600 andObject C 604, and a shareddata member zone 620 is defined betweenObject A 600,Object B 602, andObject C 604.Object A 600 has privatedata member zones data member zones data member zones data member zones - The
JVM 108 is configured to recognize which subsets of the object data members are private and which are shared. In some embodiments, when a data member in a shared data member zone is changed in one of the sharing objects, theJVM 108 automatically propagates the change to the corresponding shared zone in any other sharing objects. For example, if a data member in the shareddata member zone 620 is changed inObject C 604, theJVM 108 automatically makes the change in the corresponding data members inObject A 600 andObject B 602. In other embodiments, theJVM 108 provides the capability to specify consistency attributes for shared data member zones rather than automatically performing copies each time a data member in a shared data member zone is changed. Such consistency attributes are described in more detail in reference toFIG. 5 . -
System 100 may be implemented as amobile device 715 such as that shown inFIG. 7 . As shown, themobile device 715 includes anintegrated keypad 712 anddisplay 714. TheJSM processor 102 andMPU processor 104 and other components may be included inelectronics package 710 connected to thekeypad 712,display 714, and radio frequency (“RF”)circuitry 716. TheRF circuitry 716 may be connected to anantenna 718. - While the various embodiments of the invention have been shown and described, modifications thereof can be made by one skilled in the art without departing from the spirit and teachings of the invention. The embodiments described herein are illustrative only, and are not intended to be limiting. Many variations and modifications of the invention disclosed herein are possible and are within the scope of the invention. Accordingly, the scope of protection is not limited by the description set out above. Each and every claim is incorporated into the specification as an embodiment of the present invention.
Claims (27)
1. A method for sharing data member zones of objects in a software application executing on a processor, the method comprising:
instantiating a first object comprising a first plurality of data members;
instantiating a second object comprising a second plurality of data members;
defining a first shared data member zone comprising a first portion of the first plurality of data members and a second portion of the second plurality of data members; and
modifying a value of a data member in the first portion, the modification making the value available to a read access of a corresponding data member in the second portion.
2. The method of claim 1 , wherein modifying a value further comprises propagating the value to a physical memory location of the corresponding data member.
3. The method of claim 2 , wherein
defining a first shared data member zone further comprises setting a consistency attribute of the first portion to indicate whether modifications of data members in the first portion should be propagated, and
propagating the value further comprises propagating the value if the consistency attribute is set to indicate that modifications should be propagated.
4. The method of claim 2 , wherein
defining a first shared data member zone further comprises setting a consistency attribute of the data member in the first portion to indicate whether modifications to the data member should be propagated, and
propagating the value further comprises propagating the value if the consistency attribute of the data member is set to indicate that modifications should be propagated.
5. The method of claim 1 , wherein
defining a first shared data member zone further comprises configuring the first object to cause an access of the data member in the first portion to access a physical memory location of the corresponding data member in the second portion, and
modifying a value further comprises placing the value in the physical memory location.
6. The method of claim 5 , wherein configuring the first object further comprises causing a pointer field in a header of the first object to point to the second portion.
7. The method of claim 1 , further comprising:
instantiating a third object comprising a third plurality of data members;
defining a second shared data member zone comprising a third portion of the third plurality of data members, a subset of the first portion, and a subset of the second portion, wherein the third plurality and the subsets are the same size; and
modifying a value of a data member in the third portion, the modification making the value available to a read access of a corresponding data member in the subset of the first portion and a corresponding data member in the subset of the second portion.
8. The method of claim 7 , wherein modifying a value of a data member in the third portion further comprises propagating the value to a physical memory location of the corresponding data member in the subset of the first portion and a physical memory location of the corresponding data member in the subset of the second portion.
9. The method of claim 8 , wherein
defining a second shared data member zone further comprises setting a consistency attribute of the third portion to indicate whether modifications of data members in the third portion should be propagated, and
propagating the value to the physical memory locations of the corresponding data members in the subsets of the first and second portions further comprises propagating the value if the consistency attribute is set to indicate that modifications should be propagated.
10. The method of claim 7 , wherein
defining a second shared data member zone further comprises configuring the third object to cause an access of the data member in the third portion to access a physical memory location of the corresponding data member in the subset of the second portion, and
modifying a value of a data member in the third portion further comprises placing the value in the physical memory location of the corresponding data member in the subset of the second portion.
11. The method of claim 10 , wherein configuring the third object further comprises causing a pointer field in a header of the third object to point to the subset of the second portion.
12. The method of claim 1 , wherein the first object and the second object are Java objects.
13. A computer-readable medium storing a software program that, when executed by a processor, performs a method for sharing data member zones of objects comprising:
instantiating a first object comprising a first plurality of data members;
instantiating a second object comprising a second plurality of data members;
defining a first shared data member zone comprising a first portion of the first plurality of data members and a second portion of the second plurality of data members; and
modifying a value of a data member in the first portion, the modification making the value available to a read access of a corresponding data member in the second portion.
14. The computer-readable medium of claim 13 , wherein modifying a value further comprises propagating the value to a physical memory location of the corresponding data member.
15. The computer-readable medium of claim 14 , wherein
defining a first shared data member zone further comprises setting a consistency attribute of the first portion to indicate whether modifications of data members in the first portion should be propagated, and
propagating the value further comprises propagating the value if the consistency attribute is set to indicate that modifications should be propagated.
16. The method of claim 14 , wherein
defining a first shared data member zone further comprises setting a consistency attribute of the data member in the first portion to indicate whether modifications to the data member should be propagated, and
propagating the value further comprises propagating the value if the consistency attribute of the data member is set to indicate that modifications should be propagated.
17. The computer-readable medium of claim 13 , wherein
defining a first shared data member zone further comprises configuring the first object to cause an access of the data member in the first portion to access a physical memory location of the corresponding data member in the second portion, and
modifying a value further comprises placing the value in the physical memory location.
18. The computer-readable medium of claim 17 , wherein configuring the first object further comprises causing a pointer field in a header of the first object to point to the second portion.
19. The computer-readable medium of claim 13 , wherein the first object and the second object are Java objects.
20. A system, comprising:
a processor;
an implementation of an object oriented language configured to execute on the processor; and
a software program configured to execute on the implementation of the object-orientated language, wherein the software program is configured
to instantiate a first object comprising a first plurality of data members,
to instantiate a second object comprising a second plurality of data members,
to define a first shared data member zone comprising a first portion of the first plurality of data members and a second portion of the second plurality of data members, and
to modify a value of a data member in the first portion, the modification making the value available to a read access of a corresponding data member in the second portion.
21. The system of claim 20 , wherein the software program is further configured to modify a value by propagating the value to a physical memory location of the corresponding data member.
22. The system of claim 21 , wherein the software program is further configured to define a first shared data member zone by setting a consistency attribute of the first portion to indicate whether modifications of data members in the first portion should be propagated, and propagating the value further comprises propagating the value if the consistency attribute is set to indicate that modifications should be propagated.
23. The system of claim 21 , wherein the software program is further configured to define a first shared data member zone by setting a consistency attribute of the data member in the first portion to indicate whether modifications to the data member should be propagated, and propagating the value further comprises propagating the value if the consistency attribute of the data member is set to indicate that modifications should be propagated.
24. The system of claim 20 , wherein the software program is further configured
to define a first shared data member zone by configuring the first object to cause an access of the data member in the first portion to access a physical memory location of the corresponding data member in the second portion, and
to modify a value by placing the value in the physical memory location.
25. The system of claim 24 , wherein configuring the first object further comprises causing a pointer field in a header of the first object to point to the second portion.
26. The system of claim 20 , wherein the implementation of the object-oriented language comprises a Java virtual machine.
27. The system of claim 20 , wherein the system comprises a mobile device.
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- 2005-07-26 US US11/189,245 patent/US20060026126A1/en not_active Abandoned
- 2005-07-26 US US11/189,422 patent/US7743384B2/en active Active
- 2005-07-26 US US11/189,411 patent/US20060026580A1/en not_active Abandoned
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- 2005-07-26 US US11/189,367 patent/US7624382B2/en active Active
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US20080113586A1 (en) * | 2006-10-02 | 2008-05-15 | Mark Hardin | Electronic playset |
US20120005450A1 (en) * | 2010-07-02 | 2012-01-05 | International Business Machines Corporation | User control of file data and metadata blocks |
US10294373B2 (en) | 2011-08-02 | 2019-05-21 | Toray Plastics (America), Inc. | Method of reducing iridescence |
CN104079613A (en) * | 2013-03-29 | 2014-10-01 | 国际商业机器公司 | Method and system for multiple tenants to share application program objects |
US20140297751A1 (en) * | 2013-03-29 | 2014-10-02 | International Business Machines Corporation | Sharing application objects among multiple tenants |
US9665394B2 (en) * | 2013-03-29 | 2017-05-30 | International Business Machines Corporation | Sharing application objects among multiple tenants |
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