System and method for reducing memory leaks in virtual...

Details System and method for reducing memory leaks in virtual... System and method for reducing memory leaks in virtual...

2007-11-12

2010-06-08

Trujillo, James (Department: 2159)

Data processing: database and file management or data structures

Garbage collection

Mark-sweep

C707S817000

Reexamination Certificate

active

07734667

ABSTRACT:
A system and method is provided for reducing memory leaks in virtual machine programs, such as those encountered in programs running in the Java Virtual Machine (JVM) environment. A compiler, such as a Java Just-In-Time (JIT) compiler, is used to identify the last use of an variable and, subsequent to the program statement where the last use occurs, insert a nullification statement. The nullification statement nullifies the variable so that it no longer references an object stored in a garbage collected heap. Variables in a program are identified in the activation records of the program. The nullification statement, when executed, severs the link between the program and the objects stored in the garbage-collected heap so that the program is no longer seen as a “root” for the object, often enabling the garbage collector to reclaim memory occupied by the object sooner.

REFERENCES:
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patent: 6317869 (2001-11-01), Adl-Tabatabai et al.
patent: 6442751 (2002-08-01), Cocchi et al.
patent: 6925638 (2005-08-01), Koved et al.
patent: 2002/0120640 (2002-08-01), Hills
patent: 2003/0167356 (2003-09-01), Smith et al.

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