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It displays these in the dialog box for each function. You can often encounter situations where you can stop a program at the point an error occurs, but there are many possible routes to that point. You can also select the Break function from the Continue menu or the toolbar. To do this, you need to prepare values that let your program take every route. The debugger can bypass statements that contain errors and pass control to statements that are not in the original execution sequence. Finding linkage section allocation errors in the midst of debugging large program suites is potentially time consuming. Definition and Usage The debugger statement stops the execution of JavaScript, and calls (if available) the debugging function. Retrieves the context of the specified WOW64 thread. Alternatively, you can use a text editor to make appropriate changes to the history files, or to select particular sections for use in batch or automated debugging. Causes a breakpoint exception to occur in the current process. The Breakpoint dialog box displays a list of the breakpoints set and whether they are enabled or disabled. Figure 2.10 Finding Data Modification Locations. The debugger maintains information about a number of items: breakpoints, passage counts, watch data, and the watch conditional expression. The debugger supports two types of automated debugging: batch and automatic. Transfers execution control to the debugger. You set simple breakpoints at the current cursor location by using the toolbar Set/Delete Breakpoint button. Display source text of subprogram: Whether or not Animate and Backward Trace show the code of subprograms. Animation speed: Speed at which the Animate function executes statements. Determines whether the specified process is being debugged. For example, to confirm which location calls procedure PRM, consider the following figure. Normally, you activate debugging in your browser … Alternatively, you can select Debug, Passage Count that displays the Passage Count window. Once the debugger is in and stepping through a function, the step out button allows a programmer to run but skip debugging the remaining function statements. More complex breakpoints are set using the Debug menu Breakpoint function. Line number display method: Display the number in the COBOL source file, or a sequential line number generated by the compiler. Use the Change Start-Point to Cursor function, on the Continue or shortcut menus, to change the program execution sequence. In the Line Command window, use the BREAK command. Selecting Debug, Update Passage Count Display, causes the highlight color to change for executed statements. Use the Linkage function to allocate an area in memory for the missing linkage section item. Sometimes you know that a data item does not have the correct value but it is not obvious where the incorrect value is coming from. For example, if a calling program omits a parameter from the CALL statement, debugging of the subprogram can continue without interrupting the debugging session. The typical usage is to identify process routes. This section explains how to use the debugger for the following tasks: Changing the statement execution sequence. The stepping tutorial uses the worked example from the previous section. Read on for tutorials on debuggers like GDB and Visual Studio, as well as more exotic and powerful tools like Valgrind . State of debugger when suspended: Specifies whether the debugger should be activated or not when execution is suspended. Reading such values from a file saves you the time it would take to enter values during a test, thus making the task much easier. For example, if a calling program omits a parameter from the CALL statement, debugging of the subprogram can continue without interrupting the debugging session. Suspend execution when an exception event occurs: Indicates whether to suspend execution before the exception procedure is executed when an exception condition occurs. Alarm on suspension: Specifies whether the beeper should beep or not when execution is suspended. Replacement character for non-displayable values: This is the character that the debugger substitutes for non-displayable byte values when displaying, printing and monitoring data. How the Debugger Functions To have visibility into the internal workings of a stored routine, the debugger prepares a special version of the procedure, function, or trigger being debugged, instrumented with extra code to keep track of the current line being stepped into and the values of … The Data File I/O capability is available to read/write data values to/from a file. When the PERFORM statements are to be watched, the detection of out-of-line PERFORM errors can be handled, and the number of internal PERFORM statements for which Animate and Backward Trace will display the code can be controlled. Enables a debugger to continue a thread that previously reported a debugging event. The Backward Trace function highlights (colors) the statement currently being traced. Sets the context of the specified WOW64 thread. At the exit of the subprogram, write values stored in the data area (LINK) in the linkage section into a file (OUTFL). The Passage Count dialog box displays a list of statements with passage counts, and the counts for these statements. The usefulness of the debugger continues to increase with the size and complexity of the programs with which it used. Check the file (OUTFL) to review the values in the data area (LINK) in the linkage section that were changed by the subprogram. Control returns to you when all the commands have been executed. In these situations you need to use the Data Monitor function. The debugger lets you check the calling path using the Call Stack function available from the Window menu and the toolbar. Use the Linkage function to allocate an area in memory for the missing linkage section item. Refer to "2.6.2 Debug functions for signals handled by the exception handler". When testing programs, you often want to be sure that certain sections or lines of code have at least been executed. Flushes the instruction cache for the specified process. A debugger allows you, the programmer, to interact and inspect the running program, making it possible to trace the flow of execution and track down the problems. With automatic debugging, you select a command file during a debugging session, and the debugger executes the commands in the file. But three stepping operations, each one invoked with its own button, are among the most powerful and the most useful debugging operations possible - and they are essential for effectively debugging functions. For example, suppose the application executes the following sequence: Then the Call Stack list looks like this: Note that PROGRAMA does not appear in the list, as it is no longer active in the CALL hierarchy. You can set breakpoints at specific locations, at the entry or exit of programs, and on specific conditions being satisfied. This is useful when you set a large number of values, because you can store them in a file in advance, instead of using the SET command to change data. Specifically, programs with many functions spread over many files are much easier to debug with a good, modern debugger. Next Statement: Steps forwards from the current trace sentence to the sentence that was executed after it. 2.6.2 Debug functions for signals handled by the exception handler. Sets the action to be performed when the calling thread exits. In this mode, you specify a command file at the start of debugging. Compatibility: Specifies whether the scope of debugger functionality will be restricted to the specific version range. The Font and Color commands under View bring up dialog boxes that let you configure the font for the source code and the color of fifteen different attributes of the COBOL source display. Waits for a debugging event to occur in a process being debugged. As a colored statement shifts, you can visually review the flow of program controls. Execute the program. Suspend execution when thread end: Indicates whether to suspend execution when thread end. Display the line number: Whether or not the line number in the Source File window is displayed. In the Line Command window, LIST and SET correspond to the Data function. or the breakpoint function on the shortcut menu. So, the following figures only summarize some of the basic stepping operations. Previous Statement: Steps backward from the current trace sentence to the sentence that was executed before it. You can use the Option, Environments function to configure the following aspects of the debugging environment: The environments other than the statement identification number mode and replacement character will be enabled the next time the debugger is started. Reads data from an area of memory in a specified process. The main use of a debugger is to run the target program under controlled conditions that permit the programmer to track its operations in progress and monitor changes in computer resources (most often memory areas used by the target program or the computer's operating system) that may indicate malfunctioning code. The debugger is a very dynamic tool, so it is easier to demonstrate in a video than with static text and … Retrieves the context of the specified thread. For example, to bypass line 220 in the program below: Figure 2.11 Changing the Statement Execution Sequence.

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