Difference between revisions of "DEBUG"
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Revision as of 15:07, 1 June 2009
Class
Error Handling and Debugging
Purpose
Monitor programs during execution
Syntax
DEBUG <program | procedure> [WITH <parameter-list>]
See Also
CANCEL, DISPLAY MEMORY, DISPLAY STATUS, DO, QUIT, RESUME, SET COMPILE, SET DEVELOPMENT, SET HISTORY, SET STEP, SUSPEND
Description
The DEBUG command displays a pop-up debugger allowing the specified program to be monitored during execution.
The debugger consists of four lines of information about the current program and eighteen push buttons. Program information consists of the following lines:
| OPERATION | Displays one of the following DEBUG operations: STEP, BREAKPOINT or WATCHPOINT. |
|---|---|
| PROGRAM | Displays the name of the current procedure or program. |
| LINE# | Displays the current line number. |
| COMMAND | Displays the next program line to be executed. |
The eighteen push buttons are used to access information about the current environment and to specify memory variables and conditions to monitor during program execution. The pop-up debugger provides the following push buttons:
| BUTTON | EFFECT |
|---|---|
| Step | Step through a line at a time. |
| Suspend | Suspend the program to go to the interactive prompt, RESUME to restart. |
| Cancel | Cancel program execution and create error.mem. |
| Memory | Display currently declared memory variables. |
| Status | Display currently open tables (and their indexes, current record, etc.). |
| Calls | Show program/procedure call stack. |
| Watch | Set a watch point. When Executing the program, execution will stop when the specified memory variable's value changes. |
| Break | Set a break point. When Executing the program, execution will stop when the specified condition becomes true. |
| History | Show command history trace. |
| Execute | Run program without stepping until watch point or break point reached. |
| Wpclear | Clear all watch points. |
| Bpclear | Clear all break points. |
| Bpmark | Mark the current line as a break point. |
| Bpdrop | Clear a particular break point. |
| Wpdrop | Clear a particular watch point. |
| Bpshow | Show all break points. |
| Wpshow | Show all watch points. |
| Quit | Exit the program and debugger. |
Use the [UP], [DOWN], [LEFT], and [RIGHT] arrow keys to navigate the push buttons, and press the [RETURN] key to select a button. You may also type the accelerator key to select a button. The accelerator keys are the highlighted letters in the label of each push button.
Debugger directives can also be hard-coded into program files. These are ignored in normal program execution but activated when the program runs in debug mode Debug mode is in effect when the program is called with the DEBUG command or when SET STEP is ON. Directives start with a '//' comment prefix followed by a space, the DEBUG command, a colon (':'), and the condition. The following debugger directives are available:
| DIRECTIVE | EFFECT |
|---|---|
| // DEBUG:BREAKPOINT | Acts as if a break point has been hit when it is encountered. |
| // DEBUG:BREAKPOINT:<expL> | Acts as if a break point has been hit when <expL> evaluates to .T. (True). |
| // DEBUG:WATCHPOINT:<memvar> | Sets a watch point on the specified memory variable. |
Debugger directives can also be used when programs are run via the Recital Database and Mirage Servers.
Example
debug main
Products
Recital Database Server, Recital Mirage Server, Recital Terminal Developer
