430 results about "Byte code" patented technology

Instrumenting a computer program to provide instrumented byte code includes examining the byte code, selecting portions of the byte code for instrumentation, and instrumenting the portions to provide instrumented byte code. Selecting the portions may include choosing portions of the byte code corresponding to method entry, method exit, a throw, a method call, or a new line number. Instrumenting a portion of the byte code corresponding to a method call may include instrumenting a local line number of source code corresponding to the byte code being instrumented. Instrumenting the portions may include adding calls to instrumentation runtime functions that pass parameters indicative of the portions being instrumented. At least one of the parameters that is passed may include a line number of the source code corresponding to the portion being instrumented or a thispointer for the method corresponding to the portion being instrumented. Data from instrumentation may be passed via a message stream that is viewed as the data is being generated and / or stored.

A system and method for converting byte code of a first type into byte code of a second type. Byte code of a first type and markup language code are received as inputs. The first byte code is converted into constituent byte code data elements that can comprise any logical unit or grouping of at least a portion of a software application. The markup language code is converted into constituent markup language data elements that can comprise individual markup language tags and references to data or functionality in the first byte code. The first byte code data elements and markup language data elements are mapped to data elements of a second byte code type. The second byte code data elements are assembled into a resulting second byte code.

Under the present invention, a method, computer program product, and system for non-blocking dynamic update of statically-typed class-based object-oriented software executing as byte-code on a virtual machine within an actively running computer system is provided. A set of objects instantiated from an existing module or multiple modules (identifiable collections of application resources and class definitions in the form of byte-code representations) is ready for execution on a virtual machine in an actively running computer system. New versions of one or more modules corresponding to those already loaded into the actively running virtual machine are dynamically loaded into the virtual machine for the purpose of updating the running software. The class definitions within the loaded modules are prepared for dynamic update by inserting byte-code that enables; transparent state transfer and shared object identity between objects of a former version and the new version of a class. On the event of a software update, the objects instantiated from a former version of an updated class become un-initialized surrogate objects with the potential to redirect to their future corresponding objects. Corresponding objects are created lazily on first access of the declaring class members. Besides lazy redirection of the behavior of objects and classes, non-blocking dynamic update is achieved by lazy migration of the state of former objects and classes while locking on a temporary field access lock. Thus, the algorithm for controlling field access and state migration is completely lock-free both before and after state migration; hence the performance degradation is minimal. Finally, any unreferenced objects are removed from memory.

The invention provides systems, methods and software for creating or maintaining distributed transparent persistence of complex data objects and associated data stores. In one aspect, the invention also relates to an application programming object capable of creating or maintaining distributed transparent persistence of data objects or data object graphs without the necessity of inserting any byte codes or modification of the object graph. Virtually any java object or object praph can be transparently persisted. Further, copies of a data graph or of a portion of the data graph can be automatically reconciled and changes persisted without any persistence coding in the object model.creating.

A trusted Java virtual machine provides a method for supporting tamper-resistant applications, ensuring the integrity of an application and its secrets such as keys. The trusted Java virtual machine verifies the integrity of the Java application, prevents debugging of the Java application, and allows the Java application to securely store and retrieve secrets. The trusted Java virtual machine environment comprises a TrustedDictionary, a TrustedBundle, an optional encryption method for encrypting and decrypting byte codes, and an underlying trusted Java virtual machine. The encrypted TrustedDictionary protects data while the TrustedBundle protects programming code, allowing applications to store secret data and secure counters. The application designer can restrict TrustedBundle access to only those interfaces that the application designer explicitly exports. The open source code may optionally be encrypted. Secrets required by the open source programming code of the application are encrypted in TrustedDictionary.

The invention provides improved methods and apparatus for control using field and control devices that provide a virtual machine environment and that communicate via an IP network. By way of non-limiting example, such field device can be an “intelligent” transmitter or actuator that includes a low power processor, along with a random access memory, a read-only memory, FlashRAM, and a sensor interface. The processor can execute a real-time operating system, as well as a Java virtual machine (JVM). Java byte code executes in the JVM to configure the field device to perform typical process control functions, e.g., for proportional integral derivative (PID) control and signal conditioning. Control networks can include a plurality of such field and control devices interconnected by an IP network, such as an Ethernet.

A method and system for annotating a Java application file or ground Java application file to insert compiler hinting information such that a just-in-time compiler in a target environment preferentially compiles byte-code within the java application file.

The invention provides systems, methods and software for creating or maintaining distributed transparent persistence of complex data objects and associated data stores. In one aspect, the invention also relates to an application programming object capable of creating or maintaining distributed transparent persistence of data objects or data object graphs without the necessity of inserting any byte codes or modification of the object graph. Virtually any java object or object praph can be transparently persisted. Further, copies of a data graph or of a portion of the data graph can be automatically reconciled and changes persisted without any persistence coding in the object model.

The invention provides improved methods and apparatus for control using field and control devices that provide a virtual machine environment and that communicate via an IP network. By way of non-limiting example, such field device can be an “intelligent” transmitter or actuator that includes a low power processor, along with a random access memory, a read-only memory, FlashRAM, and a sensor interface. The processor can execute a real-time operating system, as well as a Java virtual machine (JVM). Java byte code executes in the JVM to configure the field device to perform typical process control functions, e.g., for proportional integral derivative (PID) control and signal conditioning. Control networks can include a plurality of such field and control devices interconnected by an IP network such as an Ethernet.

A system for monitoring response time of a method or function associated with a Java software component is disclosed. The system comprises an instrumentation engine for inserting instrumentation code in a byte code representation of said method or function, said instrumentation code effecting generation of a start time marker and a stop time marker upon start and completion, respectively, of the method or function. The system can further comprise an interface module that is invoked by the instrumentation code upon start and completion of said method or function, and an application response measurement (ARM) agent that is in communication with the interface module. The interface module, upon invocation by said instrumentation code, calls the ARM agent to cause generation of the start and stop time markers by the ARM agent.

The present invention is a method and system to support debug. A function is re-compiled when a field watch for a field is activated. The function includes a byte code sequence having a field byte code that accesses or modifies the field. The re-compiled function provides a native code and occupies a code space. An instrumentation code corresponding to the field watch of the field is generated. The instrumentation code is inserted to the native code.

A system and method for converting byte code of a first type into byte code of a second type. Byte code of a first type and markup language code are received as inputs. The first byte code is converted into constituent byte code data elements that can comprise any logical unit or grouping of at least a portion of a software application. The markup language code is converted into constituent markup language data elements that can comprise individual markup language tags and references to data or functionality in the first byte code. The first byte code data elements and markup language data elements are mapped to data elements of a second byte code type. The second byte code data elements are assembled into a resulting second byte code.

A system and method for converting byte code of a first type into byte code of a second type. Byte code of a first type is received as input. The first byte code is converted into constituent byte code data elements that can comprise any logical unit or grouping of at least a portion of a software application. The first byte code data elements are mapped to data elements of a second byte code type. The second byte code data elements are assembled into a resulting second byte code.