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STATUS
Program Trace Routine
Prints the status of any or all flags. Use the STATUS? command to print all flags.
Otherwise, these flags may be listed, separated by commas. The flags are as
follows:
STEP n
Name Action If Set
BYPADD Bypasses @ADD images when looking for a SNOOPY command.
NOHDG SNOOPY sign-on and sign-off information is suppressed.
UXUCOR The u-field is looked up in SYMTB$ for J = U (016) or XU (017) when
the x-field is zero.
Executes n instructions in trace mode and returns to command mode. Default for n
is one.
TOFF$ (T)
TON$
TRAP
Leaves the trace mode and continues execution as if an SLJ TOFF$ command had
been executed. Trace mode is then terminated, and the last instruction is printed.
Restarts a trace that will be terminated and executes one instruction. To compute
the number of instruction cycles performed, use the TOFF$ command followed by
the TON$ command. The TON$ command is not affected if the activity is about to
terminate by means of an EXIT$ request; to continue tracing from that point, use a
JUMP command to first establish a point from which execution will continue.
Enters command mode from trace mode whenever one of a set of locations is
referenced or altered except for ER operations. The locations may be octal numbers,
register mnemonics, or external symbols. Entering the command
“TRAPloc-1,loc-2...” places up to 16 locations in the trap table for the locators. Use
commas as separators.
If an asterisk immediately follows “TRAP”, the trap occurs only when a location's
contents are changed. If the change occurs by using an Executive Request or
asynchronously, the trap occurs at the next reference. If an exclamation point
immediately follows “TRAP”, the trace does not stop when a trapped location
changes. The old and new values are displayed, even in “PRINT N” mode.
The use of external symbols is subject to the restrictions noted for the ABSAD
command. Each specified list completely replaces the preceding list unless TRAP is
followed immediately with a + (intervening spaces not allowed). In this case, the
specifications are added to the list. The command “TRAP?” prints out the current
list. See CHANGE command for use of the symbol $.
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