HP gnu source-level debugger 5992-4701 16.6 XDB special variables and HP WDB equivalents

Table 16-18 Special language operators

XDB Language Operator	WDB Equivalent	Meaning
$addr	Depends on language	Unary operator, address of object
$in	No equivalent	Unary Boolean operator, execution
		in procedure
$sizeof	sizeof	Unary operator, size of object

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

XDB Special Variable	WDB Equivalent	Meaning
$cplusplus	No equivalent	C++ feature control flags
$depth	No equivalent	Default stack depth for local
		variables
$fpa	No equivalent	Treat FPA sequence as one
		instruction
$fpa_reg	No equivalent	Address register for FPA
		sequences
$lang	show language	Current language for expression
		evaluation
$line	No equivalent	Current source line number
$malloc	No equivalent	Debugger memory allocation
		(bytes)
$print	No equivalent	Display mode for character data
$regname	$regname	Hardware registers
$result	Use $n (value history number	Return value of last command line
	assigned to the desired result)	procedure call
$signal	No equivalent	Current child procedure signal
		number
$step	No equivalent	Number of instructions debugger
		will step in non-debuggable
		procedures before free-running
$var	$var	Dene or use special variable
		(convenience variable)

16.6 XDB special variables and HP WDB equivalents 269