HP gnu source-level debugger 5992-4701 - Manual (Page 269)

Table 16-18 Special language operators
Meaning WDB Equivalent XDB Language Operator
Unary operator, address of object Depends on language $addr
Unary Boolean operator, execution
in procedure No equivalent $in
Unary operator, size of object sizeof $sizeof
16.6 XDB special variables and HP WDB equivalents
GDB does not provide special variables of the kind that XDB has, but you can use show
and set to display and modify many debugger settings.
Table 16-19 Special variables
Meaning WDB Equivalent XDB Special Variable
C++ feature control flags No equivalent $cplusplus
Default stack depth for local
variables No equivalent $depth
Treat FPA sequence as one
instruction No equivalent $fpa
Address register for FPA
sequences No equivalent $fpa_reg
Current language for expression
evaluation show language $lang
Current source line number No equivalent $line
Debugger memory allocation
(bytes) No equivalent $malloc
Display mode for character data No equivalent $print
Hardware registers $regname $regname
Return value of last command line
procedure call Use $n (value history number
assigned to the desired result) $result
Current child procedure signal
number No equivalent $signal
Number of instructions debugger
will step in non-debuggable
procedures before free-running No equivalent $step
Dene or use special variable
(convenience variable) $var $var
16.6 XDB special variables and HP WDB equivalents 269