Summary of GT.M Debugging Tools

The following table summarizes GT.M commands, functions, and intrinsic special variables available for debugging. For more information on these commands, functions, and special variables, see the Commands, Functions, and Intrinsic Special Variables chapters.

For more information on syntax and run-time errors during Direct Mode, see Chapter 13: “Error Processing.

GT.M Debugging Tools




Contains a list of errors since it was last cleared


Contains the current level of DO/XECUTE nesting from a base of zero (0).


Returns information about the M virtual stack context, most of which freezes when an error changes $ECODE from the empty string to a list value.


Establishes a temporary breakpoint, with optional count and M action.


Invokes the GT.M compiler without a corresponding ZLINK.


Continues routine execution from a break.


Invokes the UNIX text editor specified by the EDITOR environment variable.


Removes zero or more levels from the M invocation stack and transfers control.


Includes a new or modified M routine in the current M image; automatically recompiles if necessary.


Signals a specified condition.


Displays lines of source code.


Displays information about the M environment.


Incrementally executes a routine to the beginning of the next line of the specified type.


Invokes the shell, creating a forked process.


Displays all or some local or global variables.


Contains the value of the status code for the last compile performed by a ZCOMPILE command.


Contains the status code for the last ZEDit.


Contains the current level of DO/EXECUTE nesting.


Returns the text associated with an error condition code.


Contains a string indicating the current execution location.


Controls the symbol displayed as the direct mode prompt.


Contains a string specifying a directory list containing the object, and optionally the source, files.


Contains name of the M source program most recently ZLINKed or ZEDITed; default name for next ZEDIT or ZLINK.


Contains error condition code and location of the last exception condition occurring during routine execution.


Controls the default ZSTep action.


Contains the status code of the last ZSYSTEM.