Breakpoint Activities › The Backtrace Facility › Read the Source Listing Backtrace

Read the Source Listing Backtrace

To clearly specify the program‘s execution path statement-by-statement, source statements executed from the current backtrace position are highlighted. However, when you specify a non-backtrace Source Listing option or use PF7 or PF8 to reposition the Source Listing Backtrace, the highlighting of executed statements is temporarily suspended until a backtrace PF key is entered.

When in Source Listing Backtrace mode, the current backtrace position always appears on the line just above the first source statement. This line displays as follows:

======>BACKTRACE AT #nnnnn (nnnnn -> nnnnn executed nnnnn times)<=====

The information on the previous line indicates:

• #nnnnn: The program statement or offset number where the backtrace is currently positioned
• nnnnn -> nnnnn: The first and last statement numbers of the statement block
• nnnnn times: How many times a statement block was executed

On the Source Listing Backtrace, each relevant backtrace position is indicated in the listing by an arrow or a line:

• ====> indicates the first statement in a statement block
• <==== indicates the last statement in a statement block
• ===== indicates all other statements within a statement block