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.