function of debugger

Figure 2.14 Allocating Linkage Section Items. You switch on the monitoring of a data item from the Watch window or by using the MONITOR line command. The stepping tutorial uses the worked example from the previous section. Create a file (INFL) in which the values required to take every route are set to the data item (A), assuming the data area (LINK) in the linkage section to be one record. This sets a data item to the value read from a file. If you are working with a Windows application, for example using PowerCOBOL generated code, you may need to take an action in the user window before control returns to the debugger. Animation speed: Speed at which the Animate function executes statements. Read on for tutorials on debuggers like GDB and Visual Studio, as well as more exotic and powerful tools like Valgrind . Causes a breakpoint exception to occur in the current process. 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.

Alarm on suspension during batch debugging: Specifies whether the beeper should beep or not when execution is suspended during batch debugging. For example, to confirm which location calls procedure PRM, consider the following figure. Data Monitor monitors the data item and interrupts execution when the contents change. For example, to bypass line 220 in the program below: Figure 2.11 Changing the Statement Execution Sequence. Reads data from an area of memory in a specified process. More complex breakpoints are set using the Debug menu Breakpoint function. Use the Linkage function to allocate an area in memory for the missing linkage section item. The debugger provides the Linkage function to ease such situations. The following functions are used with debugging. The Backward Trace function highlights (colors) the statement currently being traced. Selecting Debug, Update Passage Count Display, causes the highlight color to change for executed statements. That is, the debugger runs through the function, back to the statement following the original function call, without pausing between the statements.

Causes a breakpoint exception to occur in the specified process. Display all threads: Specifies whether backward trace and animation will be carried out with the implicit thread only or with all the threads.

You can use the history files, created by the debugger, as command files with no changes. To do this, you need to prepare values that let your program take every route. To do this, click and drag the Split box that is in the top right hand corner of the window, immediately above the scroll bar. The Trace function enables the recording of the flow of control.

All data is re-initialized and you can choose whether to retain or reset the following: If you need to demonstrate your debugging steps, or to perform the same debugging procedures frequently, you can automate your debug operations. The typical usage is to review processing results that might vary depending on process routes or entered data. State of debugger when suspended: Specifies whether the debugger should be activated or not when execution is suspended. Please review it as needed: The argument passing tutorial depends heavily on concepts presented previously. Specifically, programs with many functions spread over many files are much easier to debug with a good, modern debugger. Sets the action to be performed when the calling thread exits.

You can also select the Break function from the Continue menu or the toolbar. The following example shows a command file to set a breakpoint, and display a data value before and after the breakpoint. The Passage Count dialog box displays a list of statements with passage counts, and the counts for these statements. Using the debugger statement has the same function as setting a breakpoint in the code. You can set breakpoints at specific locations, at the entry or exit of programs, and on specific conditions being satisfied. You can break into looping programs, or regain control of programs being run, by pressing the esc key. Dans l'exemple qui suit, on utilise un code avec l'instruction debugger qui permet de démarrer un débogueur (s'il existe) lorsque la fonction est appelée : function codeProbablementBogue() { debugger; // exécuter des instructions qu'on veut // examiner, exécuter pas à pas etc. } 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.

Use the Change Start-Point to Cursor function, on the Continue or shortcut menus, to change the program execution sequence. The typical usage is to identify process routes. You can restart debugging the same program, without terminating the debugger, by using the Continue, Re-debug function. The debugger tutorial builds on and extends material presented previously.
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. Watch the PERFORM statements: Whether to watch the PERFORM statements. Capital/small letter on line commands: Whether the debugger handles uppercase letters and lowercase letters as equivalent on line commands. Check the file (OUTFL) to review the values in the data area (LINK) in the linkage section that were changed by the subprogram. Suspend execution when an exception event occurs: Indicates whether to suspend execution before the exception procedure is executed when an exception condition occurs. Writes data to an area of memory in a specified process. Retrieves a descriptor table entry for the specified selector and WOW64 thread. As a colored statement shifts, you can visually review the flow of program controls. Writing into a file allows you to focus on checking process routes during a test, because you can take the time to review processing results after the test is completed. Please review the following as needed: While the following videos were made with the Visual Studio debugger, the debuggers included with most modern IDE's will provide the functionality. Previous Statement: Steps backward from the current trace sentence to the sentence that was executed before it.

Execute the program. Retrieves the context of the specified thread. The debugger supports two types of automated debugging: batch and automatic. When testing programs, you often want to be sure that certain sections or lines of code have at least been executed. When execution is interrupted, you can use the Backward Trace functions to retrace the path of execution. Definition and Usage The debugger statement stops the execution of JavaScript, and calls (if available) the debugging function. Display the line number: Whether or not the line number in the Source File window is displayed. Window update during animation: Specifies whether the Call Stack window and the Thread List window will be updated during animation. 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 … Sets the context for the specified thread. The Watch window displays a list of data items being watched or monitored and a list of the conditional expressions being monitored. This writes values of data items into a file. The Specific Execution Condition on the Continue menu offers another way of executing to a particular point in the program. Please review the following: The three versions of the triple function.

A debugger or debugging tool is a computer program used to test and debugother programs (the "target" program). This function allows you to execute the program up to a particular verb, location or access point of a particular file. 2.6.2 Debug functions for signals handled by the exception handler. In the Line Command window, use the BREAK command. For example, to find out where the application updates data item A, consider the following figure. You can split the Source File window into two separately scrollable windows.

Stops the debugger from debugging the specified process. Specifying a history file in the Start Debugging dialog (Batch Debugging tab). Typical debugging facilities include the ability to run or halt the target pro… The debugger is a very dynamic tool, so it is easier to demonstrate in a video than with static text and … The Data File I/O capability is available to read/write data values to/from a file. The debugger maintains information about a number of items: breakpoints, passage counts, watch data, and the watch conditional expression. The usefulness of the debugger continues to increase with the size and complexity of the programs with which it used. You set simple breakpoints at the current cursor location by using the toolbar Set/Delete Breakpoint button. In this example, we identify the process route the subprogram takes, and review all the return values from the parameters after the debugging activities are completed. The Passage Count function lets you do this. At the entry point of the subprogram, read values stored in a file (INFL) into the data area (LINK) in the linkage section to identify the route. Sets the context of the specified WOW64 thread. The debugger provides the Linkage function to ease such situations. debugger; Exemples.

Use the Linkage function to allocate an area in memory for the missing linkage section item.

The command file drives the whole debugging session; you do not have to interact with the debugger. 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. Alternatively, you can select Debug, Passage Count that displays the Passage Count window. In this mode, you specify a command file at the start of debugging.

In the Line Command window, LIST and SET correspond to the Data function. Flushes the instruction cache for the specified process. You need to correct and recompile program source, rebuild the application, and restart debugging. 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. Refer to "Defining Exception Processes " in the "NetCOBOL User's Guide.". Because you can reference values previously stored in a file, instead of using the LIST command for displaying data, this is useful when you need to reference many values at a time. Using the Fujitsu Data Editor is recommended when you create or check a data file that is to be used for the Data File I/O capability. 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. 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. When data in the linkage section is incorrect or the timing of a program call is incorrect, you often need to confirm which program made the call.


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