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Extensions to a debugger are identified in a debugger database which is read automatically when the debugger loads. The debugger watches for trigger events in its execution environment and optionally for load conditions in a debuggee program's internal state. If a trigger event occurs and a load condition is met, then the debugger automatically loads an extension for use. Some extensions provide debugging routines that are specifically designed to support debugging of applications which use a specific programming model.

Automatic model-specific debugger extensions

Visual representations of multiple call stacks in a parallel programming system include a stack segments graph constructed by coalescing data from multiple stacks. The graph has nodes that represent stack segments and has arcs between adjacent segments. Similar stack frames are represented by the same node. In a stack prefix view of the graph, arcs are directed from a node representing stack frames to a node representing subsequently executed stack frames. In a method-centered view, an arc is shown between a node representing stack frames of a selected method and a node representing adjacent stack frames. The graph can be based on call stacks of all tasks or all threads, or based on call stacks of tasks or threads flagged by a user. Stack frame, thread, and/or task details are also displayed.

Simultaneously displaying multiple call stacks in an interactive debugger

A debugger enhancement provides a debug-task-provider interface whose implementation includes routines designed to support debugging of programs that contain tasks written for a specific programming model. Task creation hierarchies, individual task properties, resource dependencies, synchronization dependencies, and other information can be made accessible during debugging, through a model-independent interface. In a multithreaded environment, a mapping between tasks and threads is also available.

Debugging support for tasks in multithreaded environments

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