599 lines
16 KiB
Perl
599 lines
16 KiB
Perl
package DB;
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# modified Perl debugger, to be run from Emacs in perldb-mode
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# Ray Lischner (uunet!mntgfx!lisch) as of 5 Nov 1990
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# Johan Vromans -- upgrade to 4.0 pl 10
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$header = '$RCSfile: perldb.pl,v $$Revision: 1.1.1.1 $$Date: 1993/08/23 21:29:51 $';
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#
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# This file is automatically included if you do perl -d.
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# It's probably not useful to include this yourself.
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#
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# Perl supplies the values for @line and %sub. It effectively inserts
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# a do DB'DB(<linenum>); in front of every place that can
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# have a breakpoint. It also inserts a do 'perldb.pl' before the first line.
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#
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# $Log: perldb.pl,v $
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# Revision 1.1.1.1 1993/08/23 21:29:51 nate
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# PERL!
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#
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# Revision 4.0.1.3 92/06/08 13:43:57 lwall
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# patch20: support for MSDOS folded into perldb.pl
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# patch20: perldb couldn't debug file containing '-', such as STDIN designator
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#
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# Revision 4.0.1.2 91/11/05 17:55:58 lwall
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# patch11: perldb.pl modified to run within emacs in perldb-mode
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#
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# Revision 4.0.1.1 91/06/07 11:17:44 lwall
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# patch4: added $^P variable to control calling of perldb routines
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# patch4: debugger sometimes listed wrong number of lines for a statement
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#
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# Revision 4.0 91/03/20 01:25:50 lwall
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# 4.0 baseline.
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#
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# Revision 3.0.1.6 91/01/11 18:08:58 lwall
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# patch42: @_ couldn't be accessed from debugger
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#
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# Revision 3.0.1.5 90/11/10 01:40:26 lwall
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# patch38: the debugger wouldn't stop correctly or do action routines
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#
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# Revision 3.0.1.4 90/10/15 17:40:38 lwall
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# patch29: added caller
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# patch29: the debugger now understands packages and evals
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# patch29: scripts now run at almost full speed under the debugger
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# patch29: more variables are settable from debugger
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#
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# Revision 3.0.1.3 90/08/09 04:00:58 lwall
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# patch19: debugger now allows continuation lines
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# patch19: debugger can now dump lists of variables
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# patch19: debugger can now add aliases easily from prompt
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#
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# Revision 3.0.1.2 90/03/12 16:39:39 lwall
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# patch13: perl -d didn't format stack traces of *foo right
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# patch13: perl -d wiped out scalar return values of subroutines
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#
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# Revision 3.0.1.1 89/10/26 23:14:02 lwall
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# patch1: RCS expanded an unintended $Header in lib/perldb.pl
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#
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# Revision 3.0 89/10/18 15:19:46 lwall
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# 3.0 baseline
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#
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# Revision 2.0 88/06/05 00:09:45 root
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# Baseline version 2.0.
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#
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#
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if (-e "/dev/tty") {
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$console = "/dev/tty";
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$rcfile=".perldb";
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}
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else {
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$console = "con";
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$rcfile="perldb.ini";
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}
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open(IN, "<$console") || open(IN, "<&STDIN"); # so we don't dingle stdin
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open(OUT,">$console") || open(OUT, ">&STDOUT"); # so we don't dongle stdout
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select(OUT);
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$| = 1; # for DB'OUT
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select(STDOUT);
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$| = 1; # for real STDOUT
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$sub = '';
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# Is Perl being run from Emacs?
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$emacs = $main'ARGV[$[] eq '-emacs';
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shift(@main'ARGV) if $emacs;
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$header =~ s/.Header: ([^,]+),v(\s+\S+\s+\S+).*$/$1$2/;
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print OUT "\nLoading DB routines from $header\n";
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print OUT ("Emacs support ",
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$emacs ? "enabled" : "available",
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".\n");
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print OUT "\nEnter h for help.\n\n";
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sub DB {
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&save;
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($package, $filename, $line) = caller;
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$usercontext = '($@, $!, $[, $,, $/, $\) = @saved;' .
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"package $package;"; # this won't let them modify, alas
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local($^P) = 0; # don't debug our own evals
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local(*dbline) = "_<$filename";
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$max = $#dbline;
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if (($stop,$action) = split(/\0/,$dbline{$line})) {
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if ($stop eq '1') {
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$signal |= 1;
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}
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else {
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$evalarg = "\$DB'signal |= do {$stop;}"; &eval;
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$dbline{$line} =~ s/;9($|\0)/$1/;
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}
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}
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if ($single || $trace || $signal) {
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if ($emacs) {
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print OUT "\032\032$filename:$line:0\n";
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} else {
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print OUT "$package'" unless $sub =~ /'/;
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print OUT "$sub($filename:$line):\t",$dbline[$line];
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for ($i = $line + 1; $i <= $max && $dbline[$i] == 0; ++$i) {
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last if $dbline[$i] =~ /^\s*(}|#|\n)/;
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print OUT "$sub($filename:$i):\t",$dbline[$i];
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}
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}
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}
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$evalarg = $action, &eval if $action;
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if ($single || $signal) {
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$evalarg = $pre, &eval if $pre;
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print OUT $#stack . " levels deep in subroutine calls!\n"
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if $single & 4;
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$start = $line;
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CMD:
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while ((print OUT " DB<", $#hist+1, "> "), $cmd=&gets) {
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{
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$single = 0;
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$signal = 0;
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$cmd eq '' && exit 0;
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chop($cmd);
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$cmd =~ s/\\$// && do {
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print OUT " cont: ";
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$cmd .= &gets;
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redo CMD;
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};
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$cmd =~ /^q$/ && exit 0;
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$cmd =~ /^$/ && ($cmd = $laststep);
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push(@hist,$cmd) if length($cmd) > 1;
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($i) = split(/\s+/,$cmd);
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eval "\$cmd =~ $alias{$i}", print OUT $@ if $alias{$i};
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$cmd =~ /^h$/ && do {
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print OUT "
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T Stack trace.
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s Single step.
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n Next, steps over subroutine calls.
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r Return from current subroutine.
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c [line] Continue; optionally inserts a one-time-only breakpoint
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at the specified line.
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<CR> Repeat last n or s.
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l min+incr List incr+1 lines starting at min.
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l min-max List lines.
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l line List line;
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l List next window.
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- List previous window.
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w line List window around line.
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l subname List subroutine.
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f filename Switch to filename.
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/pattern/ Search forwards for pattern; final / is optional.
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?pattern? Search backwards for pattern.
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L List breakpoints and actions.
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S List subroutine names.
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t Toggle trace mode.
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b [line] [condition]
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Set breakpoint; line defaults to the current execution line;
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condition breaks if it evaluates to true, defaults to \'1\'.
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b subname [condition]
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Set breakpoint at first line of subroutine.
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d [line] Delete breakpoint.
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D Delete all breakpoints.
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a [line] command
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Set an action to be done before the line is executed.
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Sequence is: check for breakpoint, print line if necessary,
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do action, prompt user if breakpoint or step, evaluate line.
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A Delete all actions.
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V [pkg [vars]] List some (default all) variables in package (default current).
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X [vars] Same as \"V currentpackage [vars]\".
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< command Define command before prompt.
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> command Define command after prompt.
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! number Redo command (default previous command).
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! -number Redo number\'th to last command.
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H -number Display last number commands (default all).
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q or ^D Quit.
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p expr Same as \"print DB'OUT expr\" in current package.
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= [alias value] Define a command alias, or list current aliases.
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command Execute as a perl statement in current package.
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";
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next CMD; };
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$cmd =~ /^t$/ && do {
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$trace = !$trace;
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print OUT "Trace = ".($trace?"on":"off")."\n";
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next CMD; };
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$cmd =~ /^S$/ && do {
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foreach $subname (sort(keys %sub)) {
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print OUT $subname,"\n";
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}
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next CMD; };
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$cmd =~ s/^X\b/V $package/;
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$cmd =~ /^V$/ && do {
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$cmd = 'V $package'; };
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$cmd =~ /^V\b\s*(\S+)\s*(.*)/ && do {
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$packname = $1;
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@vars = split(' ',$2);
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do 'dumpvar.pl' unless defined &main'dumpvar;
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if (defined &main'dumpvar) {
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&main'dumpvar($packname,@vars);
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}
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else {
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print DB'OUT "dumpvar.pl not available.\n";
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}
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next CMD; };
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$cmd =~ /^f\b\s*(.*)/ && do {
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$file = $1;
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if (!$file) {
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print OUT "The old f command is now the r command.\n";
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print OUT "The new f command switches filenames.\n";
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next CMD;
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}
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if (!defined $_main{'_<' . $file}) {
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if (($try) = grep(m#^_<.*$file#, keys %_main)) {
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$file = substr($try,2);
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print "\n$file:\n";
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}
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}
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if (!defined $_main{'_<' . $file}) {
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print OUT "There's no code here anything matching $file.\n";
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next CMD;
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}
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elsif ($file ne $filename) {
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*dbline = "_<$file";
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$max = $#dbline;
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$filename = $file;
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$start = 1;
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$cmd = "l";
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} };
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$cmd =~ /^l\b\s*(['A-Za-z_]['\w]*)/ && do {
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$subname = $1;
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$subname = "main'" . $subname unless $subname =~ /'/;
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$subname = "main" . $subname if substr($subname,0,1) eq "'";
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($file,$subrange) = split(/:/,$sub{$subname});
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if ($file ne $filename) {
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*dbline = "_<$file";
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$max = $#dbline;
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$filename = $file;
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}
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if ($subrange) {
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if (eval($subrange) < -$window) {
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$subrange =~ s/-.*/+/;
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}
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$cmd = "l $subrange";
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} else {
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print OUT "Subroutine $1 not found.\n";
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next CMD;
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} };
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$cmd =~ /^w\b\s*(\d*)$/ && do {
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$incr = $window - 1;
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$start = $1 if $1;
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$start -= $preview;
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$cmd = 'l ' . $start . '-' . ($start + $incr); };
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$cmd =~ /^-$/ && do {
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$incr = $window - 1;
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$cmd = 'l ' . ($start-$window*2) . '+'; };
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$cmd =~ /^l$/ && do {
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$incr = $window - 1;
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$cmd = 'l ' . $start . '-' . ($start + $incr); };
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$cmd =~ /^l\b\s*(\d*)\+(\d*)$/ && do {
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$start = $1 if $1;
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$incr = $2;
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$incr = $window - 1 unless $incr;
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$cmd = 'l ' . $start . '-' . ($start + $incr); };
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$cmd =~ /^l\b\s*(([\d\$\.]+)([-,]([\d\$\.]+))?)?/ && do {
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$end = (!$2) ? $max : ($4 ? $4 : $2);
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$end = $max if $end > $max;
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$i = $2;
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$i = $line if $i eq '.';
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$i = 1 if $i < 1;
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if ($emacs) {
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print OUT "\032\032$filename:$i:0\n";
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$i = $end;
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} else {
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for (; $i <= $end; $i++) {
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print OUT "$i:\t", $dbline[$i];
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last if $signal;
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}
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}
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$start = $i; # remember in case they want more
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$start = $max if $start > $max;
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next CMD; };
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$cmd =~ /^D$/ && do {
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print OUT "Deleting all breakpoints...\n";
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for ($i = 1; $i <= $max ; $i++) {
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if (defined $dbline{$i}) {
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$dbline{$i} =~ s/^[^\0]+//;
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if ($dbline{$i} =~ s/^\0?$//) {
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delete $dbline{$i};
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}
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}
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}
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next CMD; };
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$cmd =~ /^L$/ && do {
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for ($i = 1; $i <= $max; $i++) {
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if (defined $dbline{$i}) {
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print OUT "$i:\t", $dbline[$i];
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($stop,$action) = split(/\0/, $dbline{$i});
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print OUT " break if (", $stop, ")\n"
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if $stop;
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print OUT " action: ", $action, "\n"
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if $action;
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last if $signal;
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}
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}
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next CMD; };
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$cmd =~ /^b\b\s*(['A-Za-z_]['\w]*)\s*(.*)/ && do {
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$subname = $1;
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$cond = $2 || '1';
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$subname = "$package'" . $subname unless $subname =~ /'/;
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$subname = "main" . $subname if substr($subname,0,1) eq "'";
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($filename,$i) = split(/:/, $sub{$subname});
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$i += 0;
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if ($i) {
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*dbline = "_<$filename";
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++$i while $dbline[$i] == 0 && $i < $#dbline;
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$dbline{$i} =~ s/^[^\0]*/$cond/;
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} else {
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print OUT "Subroutine $subname not found.\n";
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}
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next CMD; };
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$cmd =~ /^b\b\s*(\d*)\s*(.*)/ && do {
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$i = ($1?$1:$line);
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$cond = $2 || '1';
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if ($dbline[$i] == 0) {
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print OUT "Line $i not breakable.\n";
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} else {
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$dbline{$i} =~ s/^[^\0]*/$cond/;
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}
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next CMD; };
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$cmd =~ /^d\b\s*(\d+)?/ && do {
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$i = ($1?$1:$line);
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$dbline{$i} =~ s/^[^\0]*//;
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delete $dbline{$i} if $dbline{$i} eq '';
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next CMD; };
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$cmd =~ /^A$/ && do {
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for ($i = 1; $i <= $max ; $i++) {
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if (defined $dbline{$i}) {
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$dbline{$i} =~ s/\0[^\0]*//;
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delete $dbline{$i} if $dbline{$i} eq '';
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}
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}
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next CMD; };
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$cmd =~ /^<\s*(.*)/ && do {
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$pre = do action($1);
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next CMD; };
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$cmd =~ /^>\s*(.*)/ && do {
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$post = do action($1);
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next CMD; };
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$cmd =~ /^a\b\s*(\d+)(\s+(.*))?/ && do {
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$i = $1;
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if ($dbline[$i] == 0) {
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print OUT "Line $i may not have an action.\n";
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} else {
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$dbline{$i} =~ s/\0[^\0]*//;
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$dbline{$i} .= "\0" . do action($3);
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}
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next CMD; };
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$cmd =~ /^n$/ && do {
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$single = 2;
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$laststep = $cmd;
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last CMD; };
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$cmd =~ /^s$/ && do {
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$single = 1;
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$laststep = $cmd;
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last CMD; };
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$cmd =~ /^c\b\s*(\d*)\s*$/ && do {
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$i = $1;
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if ($i) {
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if ($dbline[$i] == 0) {
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print OUT "Line $i not breakable.\n";
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next CMD;
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}
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$dbline{$i} =~ s/(\0|$)/;9$1/; # add one-time-only b.p.
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}
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for ($i=0; $i <= $#stack; ) {
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$stack[$i++] &= ~1;
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}
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last CMD; };
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$cmd =~ /^r$/ && do {
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$stack[$#stack] |= 2;
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last CMD; };
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$cmd =~ /^T$/ && do {
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local($p,$f,$l,$s,$h,$a,@a,@sub);
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for ($i = 1; ($p,$f,$l,$s,$h,$w) = caller($i); $i++) {
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@a = @args;
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for (@a) {
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if (/^StB\000/ && length($_) == length($_main{'_main'})) {
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$_ = sprintf("%s",$_);
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}
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else {
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s/'/\\'/g;
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s/([^\0]*)/'$1'/ unless /^-?[\d.]+$/;
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s/([\200-\377])/sprintf("M-%c",ord($1)&0177)/eg;
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s/([\0-\37\177])/sprintf("^%c",ord($1)^64)/eg;
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}
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}
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$w = $w ? '@ = ' : '$ = ';
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$a = $h ? '(' . join(', ', @a) . ')' : '';
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push(@sub, "$w&$s$a from file $f line $l\n");
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last if $signal;
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}
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for ($i=0; $i <= $#sub; $i++) {
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last if $signal;
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print OUT $sub[$i];
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}
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next CMD; };
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$cmd =~ /^\/(.*)$/ && do {
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$inpat = $1;
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$inpat =~ s:([^\\])/$:$1:;
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if ($inpat ne "") {
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eval '$inpat =~ m'."\n$inpat\n";
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if ($@ ne "") {
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print OUT "$@";
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next CMD;
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}
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$pat = $inpat;
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}
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$end = $start;
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eval '
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for (;;) {
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++$start;
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$start = 1 if ($start > $max);
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last if ($start == $end);
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if ($dbline[$start] =~ m'."\n$pat\n".'i) {
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if ($emacs) {
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print OUT "\032\032$filename:$start:0\n";
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} else {
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print OUT "$start:\t", $dbline[$start], "\n";
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}
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last;
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}
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} ';
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print OUT "/$pat/: not found\n" if ($start == $end);
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next CMD; };
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$cmd =~ /^\?(.*)$/ && do {
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$inpat = $1;
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$inpat =~ s:([^\\])\?$:$1:;
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if ($inpat ne "") {
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eval '$inpat =~ m'."\n$inpat\n";
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if ($@ ne "") {
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print OUT "$@";
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next CMD;
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}
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$pat = $inpat;
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}
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$end = $start;
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eval '
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for (;;) {
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--$start;
|
|
$start = $max if ($start <= 0);
|
|
last if ($start == $end);
|
|
if ($dbline[$start] =~ m'."\n$pat\n".'i) {
|
|
if ($emacs) {
|
|
print OUT "\032\032$filename:$start:0\n";
|
|
} else {
|
|
print OUT "$start:\t", $dbline[$start], "\n";
|
|
}
|
|
last;
|
|
}
|
|
} ';
|
|
print OUT "?$pat?: not found\n" if ($start == $end);
|
|
next CMD; };
|
|
$cmd =~ /^!+\s*(-)?(\d+)?$/ && do {
|
|
pop(@hist) if length($cmd) > 1;
|
|
$i = ($1?($#hist-($2?$2:1)):($2?$2:$#hist));
|
|
$cmd = $hist[$i] . "\n";
|
|
print OUT $cmd;
|
|
redo CMD; };
|
|
$cmd =~ /^!(.+)$/ && do {
|
|
$pat = "^$1";
|
|
pop(@hist) if length($cmd) > 1;
|
|
for ($i = $#hist; $i; --$i) {
|
|
last if $hist[$i] =~ $pat;
|
|
}
|
|
if (!$i) {
|
|
print OUT "No such command!\n\n";
|
|
next CMD;
|
|
}
|
|
$cmd = $hist[$i] . "\n";
|
|
print OUT $cmd;
|
|
redo CMD; };
|
|
$cmd =~ /^H\b\s*(-(\d+))?/ && do {
|
|
$end = $2?($#hist-$2):0;
|
|
$hist = 0 if $hist < 0;
|
|
for ($i=$#hist; $i>$end; $i--) {
|
|
print OUT "$i: ",$hist[$i],"\n"
|
|
unless $hist[$i] =~ /^.?$/;
|
|
};
|
|
next CMD; };
|
|
$cmd =~ s/^p( .*)?$/print DB'OUT$1/;
|
|
$cmd =~ /^=/ && do {
|
|
if (local($k,$v) = ($cmd =~ /^=\s*(\S+)\s+(.*)/)) {
|
|
$alias{$k}="s~$k~$v~";
|
|
print OUT "$k = $v\n";
|
|
} elsif ($cmd =~ /^=\s*$/) {
|
|
foreach $k (sort keys(%alias)) {
|
|
if (($v = $alias{$k}) =~ s~^s\~$k\~(.*)\~$~$1~) {
|
|
print OUT "$k = $v\n";
|
|
} else {
|
|
print OUT "$k\t$alias{$k}\n";
|
|
};
|
|
};
|
|
};
|
|
next CMD; };
|
|
}
|
|
$evalarg = $cmd; &eval;
|
|
print OUT "\n";
|
|
}
|
|
if ($post) {
|
|
$evalarg = $post; &eval;
|
|
}
|
|
}
|
|
($@, $!, $[, $,, $/, $\) = @saved;
|
|
}
|
|
|
|
sub save {
|
|
@saved = ($@, $!, $[, $,, $/, $\);
|
|
$[ = 0; $, = ""; $/ = "\n"; $\ = "";
|
|
}
|
|
|
|
# The following takes its argument via $evalarg to preserve current @_
|
|
|
|
sub eval {
|
|
eval "$usercontext $evalarg; &DB'save";
|
|
print OUT $@;
|
|
}
|
|
|
|
sub action {
|
|
local($action) = @_;
|
|
while ($action =~ s/\\$//) {
|
|
print OUT "+ ";
|
|
$action .= &gets;
|
|
}
|
|
$action;
|
|
}
|
|
|
|
sub gets {
|
|
local($.);
|
|
<IN>;
|
|
}
|
|
|
|
sub catch {
|
|
$signal = 1;
|
|
}
|
|
|
|
sub sub {
|
|
push(@stack, $single);
|
|
$single &= 1;
|
|
$single |= 4 if $#stack == $deep;
|
|
if (wantarray) {
|
|
@i = &$sub;
|
|
$single |= pop(@stack);
|
|
@i;
|
|
}
|
|
else {
|
|
$i = &$sub;
|
|
$single |= pop(@stack);
|
|
$i;
|
|
}
|
|
}
|
|
|
|
$single = 1; # so it stops on first executable statement
|
|
@hist = ('?');
|
|
$SIG{'INT'} = "DB'catch";
|
|
$deep = 100; # warning if stack gets this deep
|
|
$window = 10;
|
|
$preview = 3;
|
|
|
|
@stack = (0);
|
|
@ARGS = @ARGV;
|
|
for (@args) {
|
|
s/'/\\'/g;
|
|
s/(.*)/'$1'/ unless /^-?[\d.]+$/;
|
|
}
|
|
|
|
if (-f $rcfile) {
|
|
do "./$rcfile";
|
|
}
|
|
elsif (-f "$ENV{'LOGDIR'}/$rcfile") {
|
|
do "$ENV{'LOGDIR'}/$rcfile";
|
|
}
|
|
elsif (-f "$ENV{'HOME'}/$rcfile") {
|
|
do "$ENV{'HOME'}/$rcfile";
|
|
}
|
|
|
|
1;
|