Inspect Manual

Inspect Concepts
Inspect Manual—429164-006
2-9
Breakpoints and Break Events
All these actions cause a debug event to occur:

You enter the DEBUG or RUND command from TACL.

You enter the START TERM command from PATHCOM for a terminal that you've
configured with a SET TERM INSPECT ON command.

You enter an Inspect command from PATHCOM.

You enter a HOLD or ADD PROGRAM command from Inspect.

Program execution (or termination) activates a breakpoint, and the breakpoint
triggers a break event.

A TACL routine or macro calls the built-in TACL function #DEBUGPROCESS

A process calls the Debug system procedure.

A process starts another process by calling the NEWPROCESS,
NEWPROCESSNOWAIT, PROCESS_CREATE_, or PROCESS_LAUNCH_
system procedure with the debug bit set.

A process encounters a trap for which it does not have a trap handler.

A process attempts to call an unresolved external routine.
After Inspect suspends program execution, it displays the status message and then
prompts you for a command. Inspect might report incorrect information for programs
that have been optimized. Therefore, if the current location in the program has been
optimized in such a way that incorrect information might result, Inspect displays this
warning message for debug events:
Breakpoints and Break Events
A breakpoint is a location in your program where you tell Inspect to suspend execution
so you can examine the program's state and perhaps modify its variables. Inspect
breakpoints can consist of three parts:

Break location—where the break event should occur

Break condition—under what conditions the break event should occur

Break action—what to do after the break event occurs

Break duration—how long the break exists
The condition and action parts are optional features that extend the capabilities of
simple breakpoints.
A break event occurs when program execution reaches a breakpoint, provided that the
conditions (if any) limiting that breakpoint are fulfilled. Once the break event occurs,
** Inspect warning 198 ** Results might be unexpected due to optimization