Citrix Systems International Gmbh

Research in Motion Corporation

Blackberry Corporation

John Fredric Arthur Dahms

Anthony Fabian Scian

Gregory Robertson Bentz

Neil Patrick Adams

Herbert Anthony Little

Stefan Erik Janhunen

Michael Carmody

David Howes

Stephen Woodward

Methods and systems for performing garbage collection involving sensitive information on a mobile device are described herein. Secure information is received at a mobile device over a wireless network. The sensitive information is extracted from the secure information. A software program operating on the mobile device uses an object to access the sensitive information. Secure garbage collection is performed upon the object after the object becomes unreachable.

Secure garbage collection on a mobile device

A method and system for performing garbage collection involving sensitive information on a mobile device. Secure information is received at a mobile device over a wireless network. The sensitive information is extracted from the secure information. A software program operating on the mobile device uses an object to access the sensitive information. Secure garbage collection is performed upon the object after the object becomes unreachable.

System and method of secure garbage collection on a mobile device

Systems and methods for providing symbolic information about fields, methods, and/or classes for a target device. A system and method may be used where the runtime processing is split between a host system and a target system. At the target device a test program uses a symbol not defined on the target device. A query is sent from the target device to a symbolic information source. The symbolic information source then provides the target device with information about the undefined symbol. The target device uses the information from the symbolic information source to complete the test program.

Testing systems and methods for a resource constrained device

A wireless mobile communication device has an application program and a garbage collection program stored in memory. The garbage collection program is configured to identify a root set of referenced objects of the application program with use of a reference indicator array and to perform a mark and sweep process based on the root set of referenced objects. The reference indicator array has a plurality of reference indicators where each referenced indicator corresponding to a referenced object is set as referenced. The application program is configured to be executed during execution of a mark and sweep process of the garbage collection program, such that information received or provided via the user interface during the execution of the mark and sweep process is received or provided without suspension or delay. The application program has computer instructions which are based on an instruction set defined by a plurality of opcodes or native codes, including a single predefined opcode or a single predefined native code which is a 'get object reference' instruction. Each 'get object reference' instruction is associated with a target object and is defined to retrieve a reference from the target object and also set one of the reference indicators corresponding to the target object as referenced in the reference indicator array.

Methods and apparatus for concurrently executing a garbage collection process during execution of a primary application program

A method for implementing software breakpoints in a software program to be executed by a interpreter, comprising the steps of executing a look-up, in a main loop of the interpreter, the look-up function searching a list of breakpoint addresses to determine whether a breakpoint instruction is to be executed at the address referenced by the interpreter's current instruction pointer instead of the program instruction, and maintaining, in memory, the list of breakpoints addresses separately from the program code, such that the breakpoint list can be altered separately from the program code.

System and method for implementing software breakpoints in an interpreter

According to the present disclosure, one or more processors of a computer device (e.g. a mobile communication device) are operative to execute a garbage collection program and an application program concurrently with execution of the garbage collection program. The garbage collection program is operative to identify a root set of referenced objects of an application program, where a reference indicator in a reference indicator array is set as referenced for each one of such referenced objects, and to perform a mark and sweep process based on the root set of referenced objects. The application program has computer instructions which includes a predefined computer instruction (e.g. a GETREF instruction) adapted to retrieve a reference from a target object and to set a reference indicator in the reference indicator array as referenced for the target object when executed. Advantageously, execution of the application program need not be unreasonably suspended during garbage collection processes. In one illustrative example, the application program is adapted to receive and/or provide information via a user interface of the computer device, and the concurrent processing allows for the receiving and/or providing of the information via the user interface without interference (e.g. suspension or delay) during the mark and sweep process.

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Waterloo, Canada

John Fredric Arthur Dahms