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perldb.pl
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Perl Script
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1992-07-05
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16KB
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596 lines
package DB;
# modified Perl debugger, to be run from Emacs in perldb-mode
# Ray Lischner (uunet!mntgfx!lisch) as of 5 Nov 1990
# Johan Vromans -- upgrade to 4.0 pl 10
$header = '$RCSfile: perldb.pl,v $$Revision: 4.0.1.3 $$Date: 92/06/08 13:43:57 $';
#
# This file is automatically included if you do perl -d.
# It's probably not useful to include this yourself.
#
# Perl supplies the values for @line and %sub. It effectively inserts
# a do DB'DB(<linenum>); in front of every place that can
# have a breakpoint. It also inserts a do 'perldb.pl' before the first line.
#
# $Log: perldb.pl,v $
# Revision 4.0.1.3 92/06/08 13:43:57 lwall
# patch20: support for MSDOS folded into perldb.pl
# patch20: perldb couldn't debug file containing '-', such as STDIN designator
#
# Revision 4.0.1.2 91/11/05 17:55:58 lwall
# patch11: perldb.pl modified to run within emacs in perldb-mode
#
# Revision 4.0.1.1 91/06/07 11:17:44 lwall
# patch4: added $^P variable to control calling of perldb routines
# patch4: debugger sometimes listed wrong number of lines for a statement
#
# Revision 4.0 91/03/20 01:25:50 lwall
# 4.0 baseline.
#
# Revision 3.0.1.6 91/01/11 18:08:58 lwall
# patch42: @_ couldn't be accessed from debugger
#
# Revision 3.0.1.5 90/11/10 01:40:26 lwall
# patch38: the debugger wouldn't stop correctly or do action routines
#
# Revision 3.0.1.4 90/10/15 17:40:38 lwall
# patch29: added caller
# patch29: the debugger now understands packages and evals
# patch29: scripts now run at almost full speed under the debugger
# patch29: more variables are settable from debugger
#
# Revision 3.0.1.3 90/08/09 04:00:58 lwall
# patch19: debugger now allows continuation lines
# patch19: debugger can now dump lists of variables
# patch19: debugger can now add aliases easily from prompt
#
# Revision 3.0.1.2 90/03/12 16:39:39 lwall
# patch13: perl -d didn't format stack traces of *foo right
# patch13: perl -d wiped out scalar return values of subroutines
#
# Revision 3.0.1.1 89/10/26 23:14:02 lwall
# patch1: RCS expanded an unintended $Header in lib/perldb.pl
#
# Revision 3.0 89/10/18 15:19:46 lwall
# 3.0 baseline
#
# Revision 2.0 88/06/05 00:09:45 root
# Baseline version 2.0.
#
#
if (-e "/dev/tty") {
$console = "/dev/tty";
$rcfile=".perldb";
}
else {
$console = "con";
$rcfile="perldb.ini";
}
open(IN, "<$console") || open(IN, "<&STDIN"); # so we don't dingle stdin
open(OUT,">$console") || open(OUT, ">&STDOUT"); # so we don't dongle stdout
select(OUT);
$| = 1; # for DB'OUT
select(STDOUT);
$| = 1; # for real STDOUT
$sub = '';
# Is Perl being run from Emacs?
$emacs = $main'ARGV[$[] eq '-emacs';
shift(@main'ARGV) if $emacs;
$header =~ s/.Header: ([^,]+),v(\s+\S+\s+\S+).*$/$1$2/;
print OUT "\nLoading DB routines from $header\n";
print OUT ("Emacs support ",
$emacs ? "enabled" : "available",
".\n");
print OUT "\nEnter h for help.\n\n";
sub DB {
&save;
($package, $filename, $line) = caller;
$usercontext = '($@, $!, $[, $,, $/, $\) = @saved;' .
"package $package;"; # this won't let them modify, alas
local($^P) = 0; # don't debug our own evals
local(*dbline) = "_<$filename";
$max = $#dbline;
if (($stop,$action) = split(/\0/,$dbline{$line})) {
if ($stop eq '1') {
$signal |= 1;
}
else {
$evalarg = "\$DB'signal |= do {$stop;}"; &eval;
$dbline{$line} =~ s/;9($|\0)/$1/;
}
}
if ($single || $trace || $signal) {
if ($emacs) {
print OUT "\032\032$filename:$line:0\n";
} else {
print OUT "$package'" unless $sub =~ /'/;
print OUT "$sub($filename:$line):\t",$dbline[$line];
for ($i = $line + 1; $i <= $max && $dbline[$i] == 0; ++$i) {
last if $dbline[$i] =~ /^\s*(}|#|\n)/;
print OUT "$sub($filename:$i):\t",$dbline[$i];
}
}
}
$evalarg = $action, &eval if $action;
if ($single || $signal) {
$evalarg = $pre, &eval if $pre;
print OUT $#stack . " levels deep in subroutine calls!\n"
if $single & 4;
$start = $line;
CMD:
while ((print OUT " DB<", $#hist+1, "> "), $cmd=&gets) {
{
$single = 0;
$signal = 0;
$cmd eq '' && exit 0;
chop($cmd);
$cmd =~ s/\\$// && do {
print OUT " cont: ";
$cmd .= &gets;
redo CMD;
};
$cmd =~ /^q$/ && exit 0;
$cmd =~ /^$/ && ($cmd = $laststep);
push(@hist,$cmd) if length($cmd) > 1;
($i) = split(/\s+/,$cmd);
eval "\$cmd =~ $alias{$i}", print OUT $@ if $alias{$i};
$cmd =~ /^h$/ && do {
print OUT "
T Stack trace.
s Single step.
n Next, steps over subroutine calls.
r Return from current subroutine.
c [line] Continue; optionally inserts a one-time-only breakpoint
at the specified line.
<CR> Repeat last n or s.
l min+incr List incr+1 lines starting at min.
l min-max List lines.
l line List line;
l List next window.
- List previous window.
w line List window around line.
l subname List subroutine.
f filename Switch to filename.
/pattern/ Search forwards for pattern; final / is optional.
?pattern? Search backwards for pattern.
L List breakpoints and actions.
S List subroutine names.
t Toggle trace mode.
b [line] [condition]
Set breakpoint; line defaults to the current execution line;
condition breaks if it evaluates to true, defaults to \'1\'.
b subname [condition]
Set breakpoint at first line of subroutine.
d [line] Delete breakpoint.
D Delete all breakpoints.
a [line] command
Set an action to be done before the line is executed.
Sequence is: check for breakpoint, print line if necessary,
do action, prompt user if breakpoint or step, evaluate line.
A Delete all actions.
V [pkg [vars]] List some (default all) variables in package (default current).
X [vars] Same as \"V currentpackage [vars]\".
< command Define command before prompt.
> command Define command after prompt.
! number Redo command (default previous command).
! -number Redo number\'th to last command.
H -number Display last number commands (default all).
q or ^D Quit.
p expr Same as \"print DB'OUT expr\" in current package.
= [alias value] Define a command alias, or list current aliases.
command Execute as a perl statement in current package.
";
next CMD; };
$cmd =~ /^t$/ && do {
$trace = !$trace;
print OUT "Trace = ".($trace?"on":"off")."\n";
next CMD; };
$cmd =~ /^S$/ && do {
foreach $subname (sort(keys %sub)) {
print OUT $subname,"\n";
}
next CMD; };
$cmd =~ s/^X\b/V $package/;
$cmd =~ /^V$/ && do {
$cmd = 'V $package'; };
$cmd =~ /^V\b\s*(\S+)\s*(.*)/ && do {
$packname = $1;
@vars = split(' ',$2);
do 'dumpvar.pl' unless defined &main'dumpvar;
if (defined &main'dumpvar) {
&main'dumpvar($packname,@vars);
}
else {
print DB'OUT "dumpvar.pl not available.\n";
}
next CMD; };
$cmd =~ /^f\b\s*(.*)/ && do {
$file = $1;
if (!$file) {
print OUT "The old f command is now the r command.\n";
print OUT "The new f command switches filenames.\n";
next CMD;
}
if (!defined $_main{'_<' . $file}) {
if (($try) = grep(m#^_<.*$file#, keys %_main)) {
$file = substr($try,2);
print "\n$file:\n";
}
}
if (!defined $_main{'_<' . $file}) {
print OUT "There's no code here anything matching $file.\n";
next CMD;
}
elsif ($file ne $filename) {
*dbline = "_<$file";
$max = $#dbline;
$filename = $file;
$start = 1;
$cmd = "l";
} };
$cmd =~ /^l\b\s*(['A-Za-z_]['\w]*)/ && do {
$subname = $1;
$subname = "main'" . $subname unless $subname =~ /'/;
$subname = "main" . $subname if substr($subname,0,1) eq "'";
($file,$subrange) = split(/:/,$sub{$subname});
if ($file ne $filename) {
*dbline = "_<$file";
$max = $#dbline;
$filename = $file;
}
if ($subrange) {
if (eval($subrange) < -$window) {
$subrange =~ s/-.*/+/;
}
$cmd = "l $subrange";
} else {
print OUT "Subroutine $1 not found.\n";
next CMD;
} };
$cmd =~ /^w\b\s*(\d*)$/ && do {
$incr = $window - 1;
$start = $1 if $1;
$start -= $preview;
$cmd = 'l ' . $start . '-' . ($start + $incr); };
$cmd =~ /^-$/