trace

trace [

restriction

] [
if
 

cond

]

Report tracing information as program is executed, according to the restriction . With no arguments, all source lines are printed before being executed. cond is a Boolean expression; if it evaluates to false, then the tracing information is not printed.

Restriction

in func

Report while executing func .

inclass class

Print name of function that called any member of class .

infunction func

Print name of function that called any top-level C++ func .

inmethod member

Print name of function that called member of any class.

expr at n

Print value of expr each time line n is reached.

func

Print name of function that called func .

n

Show source line n before executing it.

var

Print value of var each time it changes.

var [ in func ]

Same as above, but print information only while executing from within the specified procedure or function.