NAME

Devel::Events::Generator::SubTrace - generate executing_line events using the perl debugger api.

SYNOPSIS

my $g = Devel::Events::Generator::SubTrace->new( handler => $h );

$g->enable();

# every subroutine will have two events fired, on entry and exit

$g->disable();

DESCRIPTION

This Devel::Events generator will fire sub tracing events using DB::sub, a perl debugger hook.

Only one instance may be enabled at a given time. Use Devel::Events::Handler::Multiplex to deliver events to multiple handlers.

Subroutines inside the Devel::Events namespace or it's children will be skipped.

EVENTS

enter_sub

When the generator is enabled, this event will fire for every subroutine, just before it is executed.

Subroutines in a package starting with Devel::Events:: will not be reported.

name

The name of the subroutine (or it's overload::StrVal if it has none).

code

A code reference to the subroutine.

args

A copy of the arguments list. \@_ causes segfaults but [ @_ ] does not. Bummer ;-)

depth

The current depth of the call stack.

wantarray

The context of the call as given by wantarray

leave_sub

Exactly like enter_sub, but fired just after leaving the subroutine.

All the fields of enter_sub are passed.

Additional fields:

ret

The return value of the subroutine.

METHODS

enable

Enable this generator instance, disabling any other instance of Devel::Events::Generator::SubTrace.

disable

Stop firing events.

enter_sub

Called by DB::sub. Sends the enter_sub event.

leave_sub

Called by DB::sub. Sends the leave_sub event.

SEE ALSO

perldebguts, Devel::CallTrace, DB, Devel::ebug, perl5db.pl