DB
The DB module abstracts and provides all of the hooks into Perl internal debugging functionality, so that various implementations of Perl debuggers (or packages that want simply to get at the “privileged” debugging data) can all benefit from the development of this common code. The following “public” global names can be read by clients of this API, but should be considered read-only:
$DB_HASH
Stores key/data pairs in data files; equivalent to other hashing packages such as DBM, NDBM, ODBM, GDBM, and SDBM.
$DB::sub
Name of current executing subroutine.
%DB::sub
The keys of this hash are the names of all the known subroutines. Each value is an encoded string that has the
sprintf
format("%s:%d-%d", filename,
fromline, toline)
.$DB::single
Single-step flag. Will be true if the API will stop at the next statement.
$DB::signal
Signal flag. Will be true if a signal was caught.
$DB::trace
This flag is set to true if the API is tracing through subroutine calls.
@DB::args
Contains the arguments of current subroutine, or the
@ARGV
array if in the toplevel context.@DB::dbline
List of lines in currently loaded file.
%DB::dbline
Actions in current file (keys are line numbers). The values are strings that have the
sprintf
format("%s\000%s", breakcondition, actioncode)
.$DB::package
Package namespace of currently executing code.
$DB::filename
Currently loaded filename.
$DB::subname
Fully qualified name of currently executing subroutine.
$DB::lineno
Line number that will be executed next.
Get Perl in a Nutshell, 2nd Edition now with the O’Reilly learning platform.
O’Reilly members experience books, live events, courses curated by job role, and more from O’Reilly and nearly 200 top publishers.