/snap/gh/640/usr/share/perl/5.38.2
Edit: /snap/gh/640/usr/share/perl/5.38.2/DB.pm (18922B)
#
# Documentation is at the __END__
#
package DB;
# "private" globals
my ($running, $ready, $deep, $usrctxt, $evalarg,
@stack, @saved, @skippkg, @clients);
my $preeval = {};
my $posteval = {};
my $ineval = {};
####
#
# Globals - must be defined at startup so that clients can refer to
# them right after a C
#
####
BEGIN {
# these are hardcoded in perl source (some are magical)
$DB::sub = ''; # name of current subroutine
%DB::sub = (); # "filename:fromline-toline" for every known sub
$DB::single = 0; # single-step flag (set it to 1 to enable stops in BEGIN/use)
$DB::signal = 0; # signal flag (will cause a stop at the next line)
$DB::trace = 0; # are we tracing through subroutine calls?
@DB::args = (); # arguments of current subroutine or @ARGV array
@DB::dbline = (); # list of lines in currently loaded file
%DB::dbline = (); # actions in current file (keyed by line number)
@DB::ret = (); # return value of last sub executed in list context
$DB::ret = ''; # return value of last sub executed in scalar context
# other "public" globals
$DB::package = ''; # current package space
$DB::filename = ''; # current filename
$DB::subname = ''; # currently executing sub (fully qualified name)
$DB::lineno = ''; # current line number
$DB::VERSION = $DB::VERSION = '1.08';
# initialize private globals to avoid warnings
$running = 1; # are we running, or are we stopped?
@stack = (0);
@clients = ();
$deep = 1000;
$ready = 0;
@saved = ();
@skippkg = ();
$usrctxt = '';
$evalarg = '';
}
####
# entry point for all subroutine calls
#
sub sub {
push(@stack, $DB::single);
$DB::single &= 1;
$DB::single |= 4 if $#stack == $deep;
if ($DB::sub eq 'DESTROY' or substr($DB::sub, -9) eq '::DESTROY' or not defined wantarray) {
&$DB::sub;
$DB::single |= pop(@stack);
$DB::ret = undef;
}
elsif (wantarray) {
@DB::ret = &$DB::sub;
$DB::single |= pop(@stack);
@DB::ret;
}
else {
$DB::ret = &$DB::sub;
$DB::single |= pop(@stack);
$DB::ret;
}
}
####
# this is called by perl for every statement
#
sub DB {
return unless $ready;
&save;
($DB::package, $DB::filename, $DB::lineno) = caller;
return if @skippkg and grep { $_ eq $DB::package } @skippkg;
$usrctxt = "package $DB::package;"; # this won't let them modify, alas
local(*DB::dbline) = "::_<$DB::filename";
my ($stop, $action);
if (($stop,$action) = split(/\0/,$DB::dbline{$DB::lineno})) {
if ($stop eq '1') {
$DB::signal |= 1;
}
else {
$stop = 0 unless $stop; # avoid un_init warning
$evalarg = "\$DB::signal |= do { $stop; }"; &eval;
$DB::dbline{$DB::lineno} =~ s/;9($|\0)/$1/; # clear any temp breakpt
}
}
if ($DB::single || $DB::trace || $DB::signal) {
$DB::subname = ($DB::sub =~ /\'|::/) ? $DB::sub : "${DB::package}::$DB::sub"; #';
DB->loadfile($DB::filename, $DB::lineno);
}
$evalarg = $action, &eval if $action;
if ($DB::single || $DB::signal) {
_outputall($#stack . " levels deep in subroutine calls.\n") if $DB::single & 4;
$DB::single = 0;
$DB::signal = 0;
$running = 0;
&eval if ($evalarg = DB->prestop);
my $c;
for $c (@clients) {
# perform any client-specific prestop actions
&eval if ($evalarg = $c->cprestop);
# Now sit in an event loop until something sets $running
do {
$c->idle; # call client event loop; must not block
if ($running == 2) { # client wants something eval-ed
&eval if ($evalarg = $c->evalcode);
$running = 0;
}
} until $running;
# perform any client-specific poststop actions
&eval if ($evalarg = $c->cpoststop);
}
&eval if ($evalarg = DB->poststop);
}
($@, $!, $,, $/, $\, $^W) = @saved;
();
}
####
# this takes its argument via $evalarg to preserve current @_
#
sub eval {
($@, $!, $,, $/, $\, $^W) = @saved;
eval "$usrctxt $evalarg; &DB::save";
_outputall($@) if $@;
}
###############################################################################
# no compile-time subroutine call allowed before this point #
###############################################################################
use strict; # this can run only after DB() and sub() are defined
sub save {
@saved = ($@, $!, $,, $/, $\, $^W);
$, = ""; $/ = "\n"; $\ = ""; $^W = 0;
}
sub catch {
for (@clients) { $_->awaken; }
$DB::signal = 1;
$ready = 1;
}
####
#
# Client callable (read inheritable) methods defined after this point
#
####
sub register {
my $s = shift;
$s = _clientname($s) if ref($s);
push @clients, $s;
}
sub done {
my $s = shift;
$s = _clientname($s) if ref($s);
@clients = grep {$_ ne $s} @clients;
$s->cleanup;
# $running = 3 unless @clients;
exit(0) unless @clients;
}
sub _clientname {
my $name = shift;
"$name" =~ /^(.+)=[A-Z]+\(.+\)$/;
return $1;
}
sub next {
my $s = shift;
$DB::single = 2;
$running = 1;
}
sub step {
my $s = shift;
$DB::single = 1;
$running = 1;
}
sub cont {
my $s = shift;
my $i = shift;
$s->set_tbreak($i) if $i;
for ($i = 0; $i <= $#stack;) {
$stack[$i++] &= ~1;
}
$DB::single = 0;
$running = 1;
}
####
# XXX caller must experimentally determine $i (since it depends
# on how many client call frames are between this call and the DB call).
# Such is life.
#
sub ret {
my $s = shift;
my $i = shift; # how many levels to get to DB sub
$i = 0 unless defined $i;
$stack[$#stack-$i] |= 1;
$DB::single = 0;
$running = 1;
}
####
# XXX caller must experimentally determine $start (since it depends
# on how many client call frames are between this call and the DB call).
# Such is life.
#
sub backtrace {
my $self = shift;
my $start = shift;
my($p,$f,$l,$s,$h,$w,$e,$r,$a, @a, @ret,$i);
$start = 1 unless $start;
for ($i = $start; ($p,$f,$l,$s,$h,$w,$e,$r) = caller($i); $i++) {
@a = @DB::args;
for (@a) {
s/'/\\'/g;
s/([^\0]*)/'$1'/ unless /^-?[\d.]+$/;
require 'meta_notation.pm';
$_ = _meta_notation($_) if /[[:^print:]]/a;
}
$w = $w ? '@ = ' : '$ = ';
$a = $h ? '(' . join(', ', @a) . ')' : '';
$e =~ s/\n\s*\;\s*\Z// if $e;
$e =~ s/[\\\']/\\$1/g if $e;
if ($r) {
$s = "require '$e'";
} elsif (defined $r) {
$s = "eval '$e'";
} elsif ($s eq '(eval)') {
$s = "eval {...}";
}
$f = "file '$f'" unless $f eq '-e';
push @ret, "$w&$s$a from $f line $l";
last if $DB::signal;
}
return @ret;
}
sub _outputall {
my $c;
for $c (@clients) {
$c->output(@_);
}
}
sub trace_toggle {
my $s = shift;
$DB::trace = !$DB::trace;
}
####
# without args: returns all defined subroutine names
# with subname args: returns a listref [file, start, end]
#
sub subs {
my $s = shift;
if (@_) {
my(@ret) = ();
while (@_) {
my $name = shift;
push @ret, [$DB::sub{$name} =~ /^(.*)\:(\d+)-(\d+)$/]
if exists $DB::sub{$name};
}
return @ret;
}
return keys %DB::sub;
}
####
# first argument is a filename whose subs will be returned
# if a filename is not supplied, all subs in the current
# filename are returned.
#
sub filesubs {
my $s = shift;
my $fname = shift;
$fname = $DB::filename unless $fname;
return grep { $DB::sub{$_} =~ /^$fname/ } keys %DB::sub;
}
####
# returns a list of all filenames that DB knows about
#
sub files {
my $s = shift;
my(@f) = grep(m|^_<|, keys %main::);
return map { substr($_,2) } @f;
}
####
# returns reference to an array holding the lines in currently
# loaded file
#
sub lines {
my $s = shift;
return \@DB::dbline;
}
####
# loadfile($file, $line)
#
sub loadfile {
my $s = shift;
my($file, $line) = @_;
if (!defined $main::{'_<' . $file}) {
my $try;
if (($try) = grep(m|^_<.*$file|, keys %main::)) {
$file = substr($try,2);
}
}
if (defined($main::{'_<' . $file})) {
my $c;
# _outputall("Loading file $file..");
*DB::dbline = "::_<$file";
$DB::filename = $file;
for $c (@clients) {
# print "2 ", $file, '|', $line, "\n";
$c->showfile($file, $line);
}
return $file;
}
return undef;
}
sub lineevents {
my $s = shift;
my $fname = shift;
my(%ret) = ();
my $i;
$fname = $DB::filename unless $fname;
local(*DB::dbline) = "::_<$fname";
for ($i = 1; $i <= $#DB::dbline; $i++) {
$ret{$i} = [$DB::dbline[$i], split(/\0/, $DB::dbline{$i})]
if defined $DB::dbline{$i};
}
return %ret;
}
sub set_break {
my $s = shift;
my $i = shift;
my $cond = shift;
$i ||= $DB::lineno;
$cond ||= '1';
$i = _find_subline($i) if ($i =~ /\D/);
$s->output("Subroutine not found.\n") unless $i;
if ($i) {
if ($DB::dbline[$i] == 0) {
$s->output("Line $i not breakable.\n");
}
else {
$DB::dbline{$i} =~ s/^[^\0]*/$cond/;
}
}
}
sub set_tbreak {
my $s = shift;
my $i = shift;
$i = _find_subline($i) if ($i =~ /\D/);
$s->output("Subroutine not found.\n") unless $i;
if ($i) {
if ($DB::dbline[$i] == 0) {
$s->output("Line $i not breakable.\n");
}
else {
$DB::dbline{$i} =~ s/($|\0)/;9$1/; # add one-time-only b.p.
}
}
}
sub _find_subline {
my $name = shift;
$name =~ s/\'/::/;
$name = "${DB::package}\:\:" . $name if $name !~ /::/;
$name = "main" . $name if substr($name,0,2) eq "::";
my($fname, $from, $to) = ($DB::sub{$name} =~ /^(.*):(\d+)-(\d+)$/);
if ($from) {
local *DB::dbline = "::_<$fname";
++$from while $DB::dbline[$from] == 0 && $from < $to;
return $from;
}
return undef;
}
sub clr_breaks {
my $s = shift;
my $i;
if (@_) {
while (@_) {
$i = shift;
$i = _find_subline($i) if ($i =~ /\D/);
$s->output("Subroutine not found.\n") unless $i;
if (defined $DB::dbline{$i}) {
$DB::dbline{$i} =~ s/^[^\0]+//;
if ($DB::dbline{$i} =~ s/^\0?$//) {
delete $DB::dbline{$i};
}
}
}
}
else {
for ($i = 1; $i <= $#DB::dbline ; $i++) {
if (defined $DB::dbline{$i}) {
$DB::dbline{$i} =~ s/^[^\0]+//;
if ($DB::dbline{$i} =~ s/^\0?$//) {
delete $DB::dbline{$i};
}
}
}
}
}
sub set_action {
my $s = shift;
my $i = shift;
my $act = shift;
$i = _find_subline($i) if ($i =~ /\D/);
$s->output("Subroutine not found.\n") unless $i;
if ($i) {
if ($DB::dbline[$i] == 0) {
$s->output("Line $i not actionable.\n");
}
else {
$DB::dbline{$i} =~ s/\0[^\0]*//;
$DB::dbline{$i} .= "\0" . $act;
}
}
}
sub clr_actions {
my $s = shift;
my $i;
if (@_) {
while (@_) {
my $i = shift;
$i = _find_subline($i) if ($i =~ /\D/);
$s->output("Subroutine not found.\n") unless $i;
if ($i && $DB::dbline[$i] != 0) {
$DB::dbline{$i} =~ s/\0[^\0]*//;
delete $DB::dbline{$i} if $DB::dbline{$i} =~ s/^\0?$//;
}
}
}
else {
for ($i = 1; $i <= $#DB::dbline ; $i++) {
if (defined $DB::dbline{$i}) {
$DB::dbline{$i} =~ s/\0[^\0]*//;
delete $DB::dbline{$i} if $DB::dbline{$i} =~ s/^\0?$//;
}
}
}
}
sub prestop {
my ($client, $val) = @_;
return defined($val) ? $preeval->{$client} = $val : $preeval->{$client};
}
sub poststop {
my ($client, $val) = @_;
return defined($val) ? $posteval->{$client} = $val : $posteval->{$client};
}
#
# "pure virtual" methods
#
# client-specific pre/post-stop actions.
sub cprestop {}
sub cpoststop {}
# client complete startup
sub awaken {}
sub skippkg {
my $s = shift;
push @skippkg, @_ if @_;
}
sub evalcode {
my ($client, $val) = @_;
if (defined $val) {
$running = 2; # hand over to DB() to evaluate in its context
$ineval->{$client} = $val;
}
return $ineval->{$client};
}
sub ready {
my $s = shift;
return $ready = 1;
}
# stubs
sub init {}
sub stop {}
sub idle {}
sub cleanup {}
sub output {}
#
# client init
#
for (@clients) { $_->init }
$SIG{'INT'} = \&DB::catch;
# disable this if stepping through END blocks is desired
# (looks scary and deconstructivist with Swat)
END { $ready = 0 }
1;
__END__
=head1 NAME
DB - programmatic interface to the Perl debugging API
=head1 SYNOPSIS
package CLIENT;
use DB;
@ISA = qw(DB);
# these (inherited) methods can be called by the client
CLIENT->register() # register a client package name
CLIENT->done() # de-register from the debugging API
CLIENT->skippkg('hide::hide') # ask DB not to stop in this package
CLIENT->cont([WHERE]) # run some more (until BREAK or
# another breakpointt)
CLIENT->step() # single step
CLIENT->next() # step over
CLIENT->ret() # return from current subroutine
CLIENT->backtrace() # return the call stack description
CLIENT->ready() # call when client setup is done
CLIENT->trace_toggle() # toggle subroutine call trace mode
CLIENT->subs([SUBS]) # return subroutine information
CLIENT->files() # return list of all files known to DB
CLIENT->lines() # return lines in currently loaded file
CLIENT->loadfile(FILE,LINE) # load a file and let other clients know
CLIENT->lineevents() # return info on lines with actions
CLIENT->set_break([WHERE],[COND])
CLIENT->set_tbreak([WHERE])
CLIENT->clr_breaks([LIST])
CLIENT->set_action(WHERE,ACTION)
CLIENT->clr_actions([LIST])
CLIENT->evalcode(STRING) # eval STRING in executing code's context
CLIENT->prestop([STRING]) # execute in code context before stopping
CLIENT->poststop([STRING])# execute in code context before resuming
# These methods will be called at the appropriate times.
# Stub versions provided do nothing.
# None of these can block.
CLIENT->init() # called when debug API inits itself
CLIENT->stop(FILE,LINE) # when execution stops
CLIENT->idle() # while stopped (can be a client event loop)
CLIENT->cleanup() # just before exit
CLIENT->output(LIST) # called to print any output that
# the API must show
=head1 DESCRIPTION
Perl debug information is frequently required not just by debuggers,
but also by modules that need some "special" information to do their
job properly, like profilers.
This module abstracts and provides all of the hooks into Perl internal
debugging functionality, so that various implementations of Perl debuggers
(or packages that want to simply get at the "privileged" debugging data)
can all benefit from the development of this common code. Currently used
by Swat, the perl/Tk GUI debugger.
Note that multiple "front-ends" can latch into this debugging API
simultaneously. This is intended to facilitate things like
debugging with a command line and GUI at the same time, debugging
debuggers etc. [Sounds nice, but this needs some serious support -- GSAR]
In particular, this API does B provide the following functions:
=over 4
=item *
data display
=item *
command processing
=item *
command alias management
=item *
user interface (tty or graphical)
=back
These are intended to be services performed by the clients of this API.
This module attempts to be squeaky clean w.r.t C