Viewing a PL/I program structure

Use the Open Call Hierarchy action to see a tree-structure view of the procedure and function calls in a PL/I file.

About this task

The Call Hierarchy view is a tree graphic that displays functions and procedures. This view provides a way to navigate a large or complex PL/I file that contains many procedures and assists you with determining the call flow between the procedures. The Call Hierarchy view provides information from both a called and caller perspective.

There are two sections in the Call Hierarchy view,

The left column contains the tree structure of the specified function or procedure
The right column shows the line number for the code. When you click a node in the tree structure, the corresponding line number is displayed.

Restriction:

The Call Hierarchy function has several limitations:

Only static calls to procedures and functions are supported. Variable references to function names and procedure names are not supported.
Multiple labels for a single procedure or function definition are not supported.
Multiple entry points into a procedure are not supported.
Double-clicking a procedure name when the procedure definition is in an expanded macro source results in being taken to the macro call.

Procedure

In the editor, select the element that you want to view.
Right-click and click Open Call Hierarchy from the menu.
The Call Hierarchy view opens.

Navigating the Call Hierarchy view

Procedure

The Call Hierarchy view contains the following toolbar buttons for filtering the contents of the view.

Callee Hierarchy: Displays in the view only the procedures that called the highlighted procedure.
Caller Hierarchy: Displays in the view only the procedures that are called by the highlighted procedure.
View menu: Shows a list of functions to perform in the Call Hierarchy view. In addition to the Caller Hierarchy and Callee Hierarchy view, you can select to hide or show built in functions.