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perl-Devel-StackTrace - Perl module implementing stack trace and stack trace frame objects…  more info»


    Devel::StackTrace - Stack trace and stack trace frame objects

      use Devel::StackTrace;

      my $trace = Devel::StackTrace->new;

      print $trace->as_string; # like carp

      # from top (most recent) of stack to bottom.
      while (my $frame = $trace->next_frame)
          print "Has args\n" if $frame->hasargs;

      # from bottom (least recent) of stack to top.
      while (my $frame = $trace->prev_frame)
          print "Sub: ", $frame->subroutine, "\n";

    The Devel::StackTrace module contains two classes, Devel::StackTrace and
    Devel::StackTraceFrame. The goal of this object is to encapsulate the
    information that can found through using the caller() function, as well
    as providing a simple interface to this data.

    The Devel::StackTrace object contains a set of Devel::StackTraceFrame
    objects, one for each level of the stack. The frames contain all the
    data available from `caller()'.

    This code was created to support my Exception::Class::Base class (part
    of Exception::Class) but may be useful in other contexts.

    When describing the methods of the trace object, I use the words 'top'
    and 'bottom'. In this context, the 'top' frame on the stack is the most
    recent frame and the 'bottom' is the least recent.

    Here's an example:

      foo();  # bottom frame is here

      sub foo

      sub bar
         Devel::StackTrace->new;  # top frame is here.

Devel::StackTrace METHODS
    * Devel::StackTrace->new(%named_params)
        Returns a new Devel::StackTrace object.

        Takes the following parameters:

        * frame_filter => $sub
                By default, Devel::StackTrace will include all stack frames
                before the call to its its constructor.

                However, you may want to filter out some frames with more
                granularity than 'ignore_package' or 'ignore_class' allow.

                You can provide a subroutine which is called with the raw
                frame data for each frame. This is a hash reference with two
                keys, "caller", and "args", both of which are array
                references. The "caller" key is the raw data as returned by
                Perl's `caller()' function, and the "args" key are the
                subroutine arguments found in `@DB::args'.

                The filter should return true if the frame should be
                included, or false if it should be skipped.

        * ignore_package => $package_name OR \@package_names
                Any frames where the package is one of these packages will
                not be on the stack.

        * ignore_class => $package_name OR \@package_names
                Any frames where the package is a subclass of one of these
                packages (or is the same package) will not be on the stack.

                Devel::StackTrace internally adds itself to the
                'ignore_package' parameter, meaning that the
                Devel::StackTrace package is ALWAYS ignored. However, if you
                create a subclass of Devel::StackTrace it will not be

        * no_refs => $boolean
                If this parameter is true, then Devel::StackTrace will not
                store references internally when generating stacktrace
                frames. This lets your objects go out of scope.

                Devel::StackTrace replaces any references with their
                stringified representation.

        * respect_overload => $boolean
                By default, Devel::StackTrace will call
                `overload::AddrRef()' to get the underlying string
                representation of an object, instead of respecting the
                object's stringification overloading. If you would prefer to
                see the overloaded representation of objects in stack
                traces, then set this parameter to true.

        * max_arg_length => $integer
                By default, Devel::StackTrace will display the entire
                argument for each subroutine call. Setting this parameter
                causes it to truncate the argument's string representation
                if it is longer than this number of characters.

    * $trace->next_frame
        Returns the next Devel::StackTraceFrame object down on the stack. If
        it hasn't been called before it returns the first frame. It returns
        undef when it reaches the bottom of the stack and then resets its
        pointer so the next call to `next_frame' or `prev_frame' will work

    * $trace->prev_frame
        Returns the next Devel::StackTraceFrame object up on the stack. If
        it hasn't been called before it returns the last frame. It returns
        undef when it reaches the top of the stack and then resets its
        pointer so pointer so the next call to `next_frame' or `prev_frame'
        will work properly.

    * $trace->reset_pointer
        Resets the pointer so that the next call `next_frame' or
        `prev_frame' will start at the top or bottom of the stack, as

    * $trace->frames
        Returns a list of Devel::StackTraceFrame objects. The order they are
        returned is from top (most recent) to bottom.

    * $trace->frame ($index)
        Given an index, returns the relevant frame or undef if there is not
        frame at that index. The index is exactly like a Perl array. The
        first frame is 0 and negative indexes are allowed.

    * $trace->frame_count
        Returns the number of frames in the trace object.

    * $trace->as_string
        Calls as_string on each frame from top to bottom, producing output
        quite similar to the Carp module's cluck/confess methods.

Devel::StackTraceFrame METHODS
    See the caller documentation for more information on what these methods

    * $frame->package
    * $frame->filename
    * $frame->line
    * $frame->subroutine
    * $frame->hasargs
    * $frame->wantarray
    * $frame->evaltext
        Returns undef if the frame was not part of an eval.

    * $frame->is_require
        Returns undef if the frame was not part of a require.

    * $frame->args
        Returns the arguments passed to the frame. Note that any arguments
        that are references are returned as references, not copies.

    * $frame->hints
    * $frame->bitmask

    Please submit bugs to the CPAN RT system at or
    via email at

    Dave Rolsky, <>

    Copyright (c) 2000-2006 David Rolsky. All rights reserved. This program
    is free software; you can redistribute it and/or modify it under the
    same terms as Perl itself.

    The full text of the license can be found in the LICENSE file included
    with this module.

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