Symantec Operating Corporation

Veritas Operating Corporation

Geodesic Systems, Incorporated

Charles Fiterman

Michael Spertus

Gustavo Rodriguez-Rivera

Gustavo Rodriguez Rivera

Christopher D Metcalf

Jim Polubinski, Jr

Brian Day

Daryl Hoyt

Michael P Spertus

An interactive system for debugging programs in which a persistent data base system responds to update queries containing debugging information from a debugging information source and to read queries on the debugging information from an interactive interface. The interactive interface produces the read queries in response to inputs from users and formats the results of the read queries as required by the user. One source of inputs is a standard Web browser for which the interactive interface functions as a Web server. The system also includes a command channel by which the source of debugging information receives commands from the interactive interface. In one embodiment, the command channel is implemented in the data base. In a disclosed implementation, the source of debugging information provides memory debugging information. Also disclosed are techniques for using an automatic memory management system to reduce memory fragmentation and heap footprint size.

Interactive debugging system with debug data base system

A method and mechanism for managing dynamically allocated memory. Portions of memory which are available for allocation have additional information stored in association with each portion which indicates whether the portion has been previously identified as being prematurely freed. In addition, a checksum is stored with each portion of memory. In response to a request for deallocation of a portion of memory, the portion of memory is not deallocated if it is identified as having been prematurely freed. Otherwise, the a checksum is calculated for the portion and it is freed. In response to an allocation request, a candidate portion of memory is identified for allocation and a checksum is calculated for the candidate portion. If the calculated checksum does not match a checksum previously stored for the candidate portion, the portion is identified as having been prematurely freed and is not returned for allocation.

Fixing prematurely freed objects

A memory manager comprises a memory allocator and a garbage collector. The memory allocator is configured to allocate memory for objects within a heap on behalf of a process, generate a heap map comprising a plurality of heap map entries, wherein each heap map entry of the plurality of heap map entries includes an address of an object allocated within the heap, and provide the heap map to the garbage collector. The garbage collector is configured to generate a mark list identifying one or more objects within the heap using the heap map, wherein the addresses of the one or more objects correspond to data values specified within an address space of the process, and to free a given object previously allocated in the heap if the mark list indicates that an address of the given object does not correspond to a data value specified within the address space.

Conservative garbage collectors that can be used with general memory allocators

Techniques for providing interactive user interfaces for programming constructs. A programming construct is associated with one or more metaphors ( ) that specify interactive user interfaces ( ) for the programming construct. Thus, a programming construct may have a metaphor for a text-based user interface or for one or more different graphical user interfaces. The metaphor may be associated with a description of the construct such as that found in an abstract syntax tree ( ), and the metaphor may obtain the information it needs to construct the interface from the description, so that the user interfaces automatically track changes in the programming construct. Also included is apparatus for modifying the metaphor. In one implementation, a build form function ( ) is used to read the information needed to construct the construct's user interface from the construct's description and the metaphor is modified by modifying the build form function. In the implementation, parameter values received via the user interface are incorporated into an abstract syntax tree that represents the construct.

Automatically-maintained customizable user interfaces

Growing community of inventors

Deerfield, IL, United States of America

Charles Fiterman