Abstract: A native Job Control Language (JCL) execution engine is provided in a mainframe rehosting platform/open platform for executing a migrated JCL job without converting the JCL job to another language. The JCL execution engine provides a framework which supports an internal JCL mechanism, a simulation of a plurality of mainframe utilities commonly used in JCL jobs, and a simulation of commonly used database utilities. When the JCL execution engine receives a JCL job, it generates a statement sequence from the JCL job, orders statements in the sequence into a doubly-linked sequence, and parses the doubly-linked sequence to construct a job element hierarchy tree for execution. A plurality of job initiators are provided to dequeue jobs from a job queue and dispatch the jobs to the JCL execution engine or another type of execution engine.

Abstract: In accordance with an embodiment, described herein is a system and method for providing a native JCL execution engine in a mainframe rehosting platform. A batch application runtime can comprise a JCL execution engine and one or more other types of execution engines. The JCL execution engine can provide a framework for supporting an internal JCL mechanism, a simulation of a plurality of mainframe utilities commonly used in JCL jobs, and a simulation of commonly used database utilities. When the JCL execution engine receives a JCL job, it can generate a statement sequence from the JCL job, order statements in the sequence into a doubly-linked sequence, and parse the doubly-linked sequence to construct a job element hierarchy tree for execution. A plurality of job initiators are provided to dequeue jobs from a job queue and dispatch the jobs to the JCL execution engine or another type of execution engine.

Abstract: A method, system, apparatus, and program product for displaying a program slice diagram, which represents source code. The program slice diagram includes a directed graph that has multiple nodes and arcs connecting the nodes. Nodes can correspond to statements within a selected subroutine of the source code, variable references outside the subroutine, or calls made to other subroutines that are considered part of the program slice. Arcs represent data flow dependencies between the nodes. In another aspect, the invention encompasses a software environment for visualizing source code that includes a code browser, a block-level abstract syntax tree viewer, a program slice browser, and a template viewer. This software visualization environment is integrated, allows cross-referencing between its components, and is coupled with a performance visualization environment.