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perl-5.003-bin.lha
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perl5
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perl5db.pl
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Perl Script
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1996-10-09
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42KB
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1,447 lines
package DB;
# Debugger for Perl 5.00x; perl5db.pl patch level:
$header = 'perl5db.pl patch level 0.94';
# Enhanced by ilya@math.ohio-state.edu (Ilya Zakharevich)
# Latest version available: ftp://ftp.math.ohio-state.edu/pub/users/ilya/perl
# 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
# Ilya Zakharevich -- patches after 5.001 (and some before ;-)
#
# 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 &DB'DB(<linenum>); in front of every place that can have a
# breakpoint. Instead of a subroutine call it calls &DB::sub with
# $DB::sub being the called subroutine. It also inserts a BEGIN
# {require 'perl5db.pl'} before the first line.
#
# Note that no subroutine call is possible until &DB::sub is defined
# (for subroutines defined outside this file). In fact the same is
# true if $deep is not defined.
#
# $Log: perldb.pl,v $
#
# At start reads $rcfile that may set important options. This file
# may define a subroutine &afterinit that will be executed after the
# debugger is initialized.
#
# After $rcfile is read reads environment variable PERLDB_OPTS and parses
# it as a rest of `O ...' line in debugger prompt.
#
# The options that can be specified only at startup:
# [To set in $rcfile, call &parse_options("optionName=new_value").]
#
# TTY - the TTY to use for debugging i/o.
#
# noTTY - if set, goes in NonStop mode. On interrupt if TTY is not set
# uses the value of noTTY or "/tmp/perldbtty$$" to find TTY using
# Term::Rendezvous. Current variant is to have the name of TTY in this
# file.
#
# ReadLine - If false, dummy ReadLine is used, so you can debug
# ReadLine applications.
#
# NonStop - if true, no i/o is performed until interrupt.
#
# LineInfo - file or pipe to print line number info to. If it is a
# pipe, a short "emacs like" message is used.
#
# Example $rcfile: (delete leading hashes!)
#
# &parse_options("NonStop=1 LineInfo=db.out");
# sub afterinit { $trace = 1; }
#
# The script will run without human intervention, putting trace
# information into db.out. (If you interrupt it, you would better
# reset LineInfo to something "interactive"!)
#
# Needed for the statement after exec():
BEGIN { $ini_warn = $^W; $^W = 0 } # Switch compilation warnings off until another BEGIN.
local($^W) = 0; # Switch run-time warnings off during init.
warn ( # Do not ;-)
$dumpvar::hashDepth,
$dumpvar::arrayDepth,
$dumpvar::dumpDBFiles,
$dumpvar::dumpPackages,
$dumpvar::quoteHighBit,
$dumpvar::printUndef,
$dumpvar::globPrint,
$readline::Tk_toloop,
$dumpvar::usageOnly,
@ARGS,
$Carp::CarpLevel,
$panic,
$first_time,
) if 0;
# Command-line + PERLLIB:
@ini_INC = @INC;
# $prevwarn = $prevdie = $prevbus = $prevsegv = ''; # Does not help?!
$trace = $signal = $single = 0; # Uninitialized warning suppression
# (local $^W cannot help - other packages!).
@stack = (0);
$option{PrintRet} = 1;
@options = qw(hashDepth arrayDepth DumpDBFiles DumpPackages
compactDump veryCompact quote HighBit undefPrint
globPrint PrintRet UsageOnly frame
TTY noTTY ReadLine NonStop LineInfo
recallCommand ShellBang pager tkRunning
signalLevel warnLevel dieLevel);
%optionVars = (
hashDepth => \$dumpvar::hashDepth,
arrayDepth => \$dumpvar::arrayDepth,
DumpDBFiles => \$dumpvar::dumpDBFiles,
DumpPackages => \$dumpvar::dumpPackages,
HighBit => \$dumpvar::quoteHighBit,
undefPrint => \$dumpvar::printUndef,
globPrint => \$dumpvar::globPrint,
tkRunning => \$readline::Tk_toloop,
UsageOnly => \$dumpvar::usageOnly,
frame => \$frame,
);
%optionAction = (
compactDump => \&dumpvar::compactDump,
veryCompact => \&dumpvar::veryCompact,
quote => \&dumpvar::quote,
TTY => \&TTY,
noTTY => \&noTTY,
ReadLine => \&ReadLine,
NonStop => \&NonStop,
LineInfo => \&LineInfo,
recallCommand => \&recallCommand,
ShellBang => \&shellBang,
pager => \&pager,
signalLevel => \&signalLevel,
warnLevel => \&warnLevel,
dieLevel => \&dieLevel,
);
%optionRequire = (
compactDump => 'dumpvar.pl',
veryCompact => 'dumpvar.pl',
quote => 'dumpvar.pl',
);
# These guys may be defined in $ENV{PERL5DB} :
$rl = 1 unless defined $rl;
warnLevel($warnLevel);
dieLevel($dieLevel);
signalLevel($signalLevel);
&pager(defined($ENV{PAGER}) ? $ENV{PAGER} : "|more") unless defined $pager;
&recallCommand("!") unless defined $prc;
&shellBang("!") unless defined $psh;
if (-e "/dev/tty") {
$rcfile=".perldb";
} else {
$rcfile="perldb.ini";
}
if (-f $rcfile) {
do "./$rcfile";
} elsif (defined $ENV{LOGDIR} and -f "$ENV{LOGDIR}/$rcfile") {
do "$ENV{LOGDIR}/$rcfile";
} elsif (defined $ENV{HOME} and -f "$ENV{HOME}/$rcfile") {
do "$ENV{HOME}/$rcfile";
}
if (defined $ENV{PERLDB_OPTS}) {
parse_options($ENV{PERLDB_OPTS});
}
if (exists $ENV{PERLDB_RESTART}) {
delete $ENV{PERLDB_RESTART};
# $restart = 1;
@hist = get_list('PERLDB_HIST');
my @visited = get_list("PERLDB_VISITED");
for (0 .. $#visited) {
%{$postponed{$visited[$_]}} = get_list("PERLDB_FILE_$_");
}
my %opt = get_list("PERLDB_OPT");
my ($opt,$val);
while (($opt,$val) = each %opt) {
$val =~ s/[\\\']/\\$1/g;
parse_options("$opt'$val'");
}
@INC = get_list("PERLDB_INC");
@ini_INC = @INC;
}
if ($notty) {
$runnonstop = 1;
} else {
# Is Perl being run from Emacs?
$emacs = ((defined $main::ARGV[0]) and ($main::ARGV[0] eq '-emacs'));
$rl = 0, shift(@main::ARGV) if $emacs;
#require Term::ReadLine;
if (-e "/dev/tty") {
$console = "/dev/tty";
} elsif (-e "con") {
$console = "con";
} else {
$console = "sys\$command";
}
# Around a bug:
if (defined $ENV{OS2_SHELL} and $emacs) { # In OS/2
$console = undef;
}
$console = $tty if defined $tty;
if (defined $console) {
open(IN,"+<$console") || open(IN,"<$console") || open(IN,"<&STDIN");
open(OUT,"+>$console") || open(OUT,">$console") || open(OUT,">&STDERR")
|| open(OUT,">&STDOUT"); # so we don't dongle stdout
} else {
open(IN,"<&STDIN");
open(OUT,">&STDERR") || open(OUT,">&STDOUT"); # so we don't dongle stdout
$console = 'STDIN/OUT';
}
# so open("|more") can read from STDOUT and so we don't dingle stdin
$IN = \*IN;
$OUT = \*OUT;
select($OUT);
$| = 1; # for DB::OUT
select(STDOUT);
$LINEINFO = $OUT unless defined $LINEINFO;
$lineinfo = $console unless defined $lineinfo;
$| = 1; # for real STDOUT
$header =~ s/.Header: ([^,]+),v(\s+\S+\s+\S+).*$/$1$2/;
unless ($runnonstop) {
print $OUT "\nLoading DB routines from $header\n";
print $OUT ("Emacs support ",
$emacs ? "enabled" : "available",
".\n");
print $OUT "\nEnter h or `h h' for help.\n\n";
}
}
@ARGS = @ARGV;
for (@args) {
s/\'/\\\'/g;
s/(.*)/'$1'/ unless /^-?[\d.]+$/;
}
if (defined &afterinit) { # May be defined in $rcfile
&afterinit();
}
############################################################ Subroutines
sub DB {
unless ($first_time++) { # Do when-running init
if ($runnonstop) { # Disable until signal
for ($i=0; $i <= $#stack; ) {
$stack[$i++] &= ~1;
}
$single = 0;
return;
}
# Define a subroutine in which we will stop
# eval <<'EOE';
# sub at_end::db {"Debuggee terminating";}
# END {
# $DB::step = 1;
# print $OUT "Debuggee terminating.\n";
# &at_end::db;}
# EOE
}
&save;
if ($doret) {
$doret = 0;
if ($option{PrintRet}) {
print $OUT "$retctx context return from $lastsub:",
($retctx eq 'list') ? "\n" : " " ;
dumpit( ($retctx eq 'list') ? \@ret : $ret );
}
}
($package, $filename, $line) = caller;
$filename_ini = $filename;
$usercontext = '($@, $!, $,, $/, $\, $^W) = @saved;' .
"package $package;"; # this won't let them modify, alas
local(*dbline) = "::_<$filename";
install_breakpoints($filename) unless $visited{$filename}++;
$max = $#dbline;
if (($stop,$action) = split(/\0/,$dbline{$line})) {
if ($stop eq '1') {
$signal |= 1;
} elsif ($stop) {
$evalarg = "\$DB::signal |= do {$stop;}"; &eval;
$dbline{$line} =~ s/;9($|\0)/$1/;
}
}
if ($single || $trace || $signal) {
$term || &setterm;
if ($emacs) {
$position = "\032\032$filename:$line:0\n";
print $LINEINFO $position;
} else {
$sub =~ s/\'/::/;
$prefix = $sub =~ /::/ ? "" : "${'package'}::";
$prefix .= "$sub($filename:";
$after = ($dbline[$line] =~ /\n$/ ? '' : "\n");
if (length($prefix) > 30) {
$position = "$prefix$line):\n$line:\t$dbline[$line]$after";
print $LINEINFO $position;
$prefix = "";
$infix = ":\t";
} else {
$infix = "):\t";
$position = "$prefix$line$infix$dbline[$line]$after";
print $LINEINFO $position;
}
for ($i = $line + 1; $i <= $max && $dbline[$i] == 0; ++$i) { #{ vi
last if $dbline[$i] =~ /^\s*[\;\}\#\n]/;
$after = ($dbline[$i] =~ /\n$/ ? '' : "\n");
$incr_pos = "$prefix$i$infix$dbline[$i]$after";
print $LINEINFO $incr_pos;
$position .= $incr_pos;
}
}
}
$evalarg = $action, &eval if $action;
if ($single || $signal) {
local $level = $level + 1;
$evalarg = $pre, &eval if $pre;
print $OUT $#stack . " levels deep in subroutine calls!\n"
if $single & 4;
$start = $line;
CMD:
while (($term || &setterm),
defined ($cmd=&readline(" DB" . ('<' x $level) .
($#hist+1) . ('>' x $level) .
" "))) {
#{ # <-- Do we know what this brace is for?
$single = 0;
$signal = 0;
$cmd =~ s/\\$/\n/ && do {
$cmd .= &readline(" cont: ");
redo CMD;
};
$cmd =~ /^q$/ && exit 0;
$cmd =~ /^$/ && ($cmd = $laststep);
push(@hist,$cmd) if length($cmd) > 1;
PIPE: {
($i) = split(/\s+/,$cmd);
eval "\$cmd =~ $alias{$i}", print $OUT $@ if $alias{$i};
$cmd =~ /^h$/ && do {
print $OUT $help;
next CMD; };
$cmd =~ /^h\s+h$/ && do {
print $OUT $summary;
next CMD; };
$cmd =~ /^h\s+(\S)$/ && do {
my $asked = "\Q$1";
if ($help =~ /^($asked([\s\S]*?)\n)(\Z|[^\s$asked])/m) {
print $OUT $1;
} else {
print $OUT "`$asked' is not a debugger command.\n";
}
next CMD; };
$cmd =~ /^t$/ && do {
$trace = !$trace;
print $OUT "Trace = ".($trace?"on":"off")."\n";
next CMD; };
$cmd =~ /^S(\s+(!)?(.+))?$/ && do {
$Srev = defined $2; $Spatt = $3; $Snocheck = ! defined $1;
foreach $subname (sort(keys %sub)) {
if ($Snocheck or $Srev^($subname =~ /$Spatt/)) {
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 {
local ($savout) = select($OUT);
$packname = $1;
@vars = split(' ',$2);
do 'dumpvar.pl' unless defined &main::dumpvar;
if (defined &main::dumpvar) {
local $frame = 0;
&main::dumpvar($packname,@vars);
} else {
print $OUT "dumpvar.pl not available.\n";
}
select ($savout);
next CMD; };
$cmd =~ s/^x\b/ / && do { # So that will be evaled
$onetimeDump = 1; };
$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 matching $file.\n";
next CMD;
} elsif ($file ne $filename) {
*dbline = "::_<$file";
$visited{$file}++;
$max = $#dbline;
$filename = $file;
$start = 1;
$cmd = "l";
} };
$cmd =~ /^l\b\s*([\':A-Za-z_][\':\w]*)/ && do {
$subname = $1;
$subname =~ s/\'/::/;
$subname = "main::".$subname unless $subname =~ /::/;
$subname = "main".$subname if substr($subname,0,2) eq "::";
@pieces = split(/:/,$sub{$subname});
$subrange = pop @pieces;
$file = join(':', @pieces);
if ($file ne $filename) {
*dbline = "::_<$file";
$visited{$file}++;
$max = $#dbline;
$filename = $file;
}
if ($subrange) {
if (eval($subrange) < -$window) {
$subrange =~ s/-.*/+/;
}
$cmd = "l $subrange";
} else {
print $OUT "Subroutine $subname not found.\n";
next CMD;
} };
$cmd =~ /^\.$/ && do {
$start = $line;
$filename = $filename_ini;
*dbline = "::_<$filename";
$max = $#dbline;
print $LINEINFO $position;
next CMD };
$cmd =~ /^w\b\s*(\d*)$/ && do {
$incr = $window - 1;
$start = $1 if $1;
$start -= $preview;
#print $OUT 'l ' . $start . '-' . ($start + $incr);
$cmd = 'l ' . $start . '-' . ($start + $incr); };
$cmd =~ /^-$/ && do {
$incr = $window - 1;
$cmd = 'l ' . ($start-$window*2) . '+'; };
$cmd =~ /^l$/ && do {
$incr = $window - 1;
$cmd = 'l ' . $start . '-' . ($start + $incr); };
$cmd =~ /^l\b\s*(\d*)\+(\d*)$/ && do {
$start = $1 if $1;
$incr = $2;
$incr = $window - 1 unless $incr;
$cmd = 'l ' . $start . '-' . ($start + $incr); };
$cmd =~ /^l\b\s*((-?[\d\$\.]+)([-,]([\d\$\.]+))?)?/ && do {
$end = (!defined $2) ? $max : ($4 ? $4 : $2);
$end = $max if $end > $max;
$i = $2;
$i = $line if $i eq '.';
$i = 1 if $i < 1;
if ($emacs) {
print $OUT "\032\032$filename:$i:0\n";
$i = $end;
} else {
for (; $i <= $end; $i++) {
($stop,$action) = split(/\0/, $dbline{$i});
$arrow = ($i==$line
and $filename eq $filename_ini)
? '==>'
: ':' ;
$arrow .= 'b' if $stop;
$arrow .= 'a' if $action;
print $OUT "$i$arrow\t", $dbline[$i];
last if $signal;
}
}
$start = $i; # remember in case they want more
$start = $max if $start > $max;
next CMD; };
$cmd =~ /^D$/ && do {
print $OUT "Deleting all breakpoints...\n";
for ($i = 1; $i <= $max ; $i++) {
if (defined $dbline{$i}) {
$dbline{$i} =~ s/^[^\0]+//;
if ($dbline{$i} =~ s/^\0?$//) {
delete $dbline{$i};
}
}
}
next CMD; };
$cmd =~ /^L$/ && do {
for ($i = 1; $i <= $max; $i++) {
if (defined $dbline{$i}) {
print $OUT "$i:\t", $dbline[$i];
($stop,$action) = split(/\0/, $dbline{$i});
print $OUT " break if (", $stop, ")\n"
if $stop;
print $OUT " action: ", $action, "\n"
if $action;
last if $signal;
}
}
next CMD; };
$cmd =~ /^b\b\s*([':A-Za-z_][':\w]*)\s*(.*)/ && do {
$subname = $1;
$cond = $2 || '1';
$subname =~ s/\'/::/;
$subname = "${'package'}::" . $subname
unless $subname =~ /::/;
$subname = "main".$subname if substr($subname,0,2) eq "::";
# Filename below can contain ':'
($file,$i) = ($sub{$subname} =~ /^(.*):(.*)$/);
$i += 0;
if ($i) {
$filename = $file;
*dbline = "::_<$filename";
$visited{$filename}++;
$max = $#dbline;
++$i while $dbline[$i] == 0 && $i < $max;
$dbline{$i} =~ s/^[^\0]*/$cond/;
} else {
print $OUT "Subroutine $subname not found.\n";
}
next CMD; };
$cmd =~ /^b\b\s*(\d*)\s*(.*)/ && do {
$i = ($1?$1:$line);
$cond = $2 || '1';
if ($dbline[$i] == 0) {
print $OUT "Line $i not breakable.\n";
} else {
$dbline{$i} =~ s/^[^\0]*/$cond/;
}
next CMD; };
$cmd =~ /^d\b\s*(\d+)?/ && do {
$i = ($1?$1:$line);
$dbline{$i} =~ s/^[^\0]*//;
delete $dbline{$i} if $dbline{$i} eq '';
next CMD; };
$cmd =~ /^A$/ && do {
for ($i = 1; $i <= $max ; $i++) {
if (defined $dbline{$i}) {
$dbline{$i} =~ s/\0[^\0]*//;
delete $dbline{$i} if $dbline{$i} eq '';
}
}
next CMD; };
$cmd =~ /^O\s*$/ && do {
for (@options) {
&dump_option($_);
}
next CMD; };
$cmd =~ /^O\s*(\S.*)/ && do {
parse_options($1);
next CMD; };
$cmd =~ /^<\s*(.*)/ && do {
$pre = action($1);
next CMD; };
$cmd =~ /^>\s*(.*)/ && do {
$post = action($1);
next CMD; };
$cmd =~ /^a\b\s*(\d+)(\s+(.*))?/ && do {
$i = $1; $j = $3;
if ($dbline[$i] == 0) {
print $OUT "Line $i may not have an action.\n";
} else {
$dbline{$i} =~ s/\0[^\0]*//;
$dbline{$i} .= "\0" . action($j);
}
next CMD; };
$cmd =~ /^n$/ && do {
$single = 2;
$laststep = $cmd;
last CMD; };
$cmd =~ /^s$/ && do {
$single = 1;
$laststep = $cmd;
last CMD; };
$cmd =~ /^c\b\s*([\w:]*)\s*$/ && do {
$i = $1;
if ($i =~ /\D/) { # subroutine name
($file,$i) = ($sub{$i} =~ /^(.*):(.*)$/);
$i += 0;
if ($i) {
$filename = $file;
*dbline = "::_<$filename";
$visited{$filename}++;
$max = $#dbline;
++$i while $dbline[$i] == 0 && $i < $max;
} else {
print $OUT "Subroutine $subname not found.\n";
next CMD;
}
}
if ($i) {
if ($dbline[$i] == 0) {
print $OUT "Line $i not breakable.\n";
next CMD;
}
$dbline{$i} =~ s/($|\0)/;9$1/; # add one-time-only b.p.
}
for ($i=0; $i <= $#stack; ) {
$stack[$i++] &= ~1;
}
last CMD; };
$cmd =~ /^r$/ && do {
$stack[$#stack] |= 1;
$doret = 1;
last CMD; };
$cmd =~ /^R$/ && do {
print $OUT "Warning: a lot of settings and command-line options may be lost!\n";
my (@script, @flags, $cl);
push @flags, '-w' if $ini_warn;
# Put all the old includes at the start to get
# the same debugger.
for (@ini_INC) {
push @flags, '-I', $_;
}
# Arrange for setting the old INC:
set_list("PERLDB_INC", @ini_INC);
if ($0 eq '-e') {
for (1..$#{'::_<-e'}) { # The first line is PERL5DB
chomp ($cl = $ {'::_<-e'}[$_]);
push @script, '-e', $cl;
}
} else {
@script = $0;
}
set_list("PERLDB_HIST",
$term->Features->{getHistory}
? $term->GetHistory : @hist);
my @visited = keys %visited;
set_list("PERLDB_VISITED", @visited);
set_list("PERLDB_OPT", %option);
for (0 .. $#visited) {
*dbline = "::_<$visited[$_]";
set_list("PERLDB_FILE_$_", %dbline);
}
$ENV{PERLDB_RESTART} = 1;
#print "$^X, '-d', @flags, @script, ($emacs ? '-emacs' : ()), @ARGS";
exec $^X, '-d', @flags, @script, ($emacs ? '-emacs' : ()), @ARGS;
print $OUT "exec failed: $!\n";
last CMD; };
$cmd =~ /^T$/ && do {
local($p,$f,$l,$s,$h,$a,$e,$r,@a,@sub);
for ($i = 1;
($p,$f,$l,$s,$h,$w,$e,$r) = caller($i);
$i++) {
@a = ();
for $arg (@args) {
$_ = "$arg";
s/([\'\\])/\\$1/g;
s/([^\0]*)/'$1'/
unless /^(?: -?[\d.]+ | \*[\w:]* )$/x;
s/([\200-\377])/sprintf("M-%c",ord($1)&0177)/eg;
s/([\0-\37\177])/sprintf("^%c",ord($1)^64)/eg;
push(@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(@sub, "$w$s$a called from $f line $l\n");
last if $signal;
}
for ($i=0; $i <= $#sub; $i++) {
last if $signal;
print $OUT $sub[$i];
}
next CMD; };
$cmd =~ /^\/(.*)$/ && do {
$inpat = $1;
$inpat =~ s:([^\\])/$:$1:;
if ($inpat ne "") {
eval '$inpat =~ m'."\a$inpat\a";
if ($@ ne "") {
print $OUT "$@";
next CMD;
}
$pat = $inpat;
}
$end = $start;
eval '
for (;;) {
++$start;
$start = 1 if ($start > $max);
last if ($start == $end);
if ($dbline[$start] =~ m' . "\a$pat\a" . '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 =~ /^\?(.*)$/ && do {
$inpat = $1;
$inpat =~ s:([^\\])\?$:$1:;
if ($inpat ne "") {
eval '$inpat =~ m'."\a$inpat\a";
if ($@ ne "") {
print $OUT "$@";
next CMD;
}
$pat = $inpat;
}
$end = $start;
eval '
for (;;) {
--$start;
$start = $max if ($start <= 0);
last if ($start == $end);
if ($dbline[$start] =~ m' . "\a$pat\a" . '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 =~ /^$rc+\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 =~ /^$sh$sh\s*/ && do {
&system($');
next CMD; };
$cmd =~ /^$rc([^$rc].*)$/ && 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 =~ /^$sh$/ && do {
&system($ENV{SHELL}||"/bin/sh");
next CMD; };
$cmd =~ /^$sh\s*/ && do {
&system($ENV{SHELL}||"/bin/sh","-c",$');
next 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 \$_/;
$cmd =~ s/^p\b/print \$DB::OUT /;
$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; };
$cmd =~ /^\|\|?\s*[^|]/ && do {
if ($pager =~ /^\|/) {
open(SAVEOUT,">&STDOUT") || &warn("Can't save STDOUT");
open(STDOUT,">&OUT") || &warn("Can't redirect STDOUT");
} else {
open(SAVEOUT,">&OUT") || &warn("Can't save DB::OUT");
}
unless ($piped=open(OUT,$pager)) {
&warn("Can't pipe output to `$pager'");
if ($pager =~ /^\|/) {
open(OUT,">&STDOUT") || &warn("Can't restore DB::OUT");
open(STDOUT,">&SAVEOUT")
|| &warn("Can't restore STDOUT");
close(SAVEOUT);
} else {
open(OUT,">&STDOUT") || &warn("Can't restore DB::OUT");
}
next CMD;
}
$SIG{PIPE}= "DB::catch" if $pager =~ /^\|/
&& "" eq $SIG{PIPE} || "DEFAULT" eq $SIG{PIPE};
$selected= select(OUT);
$|= 1;
select( $selected ), $selected= "" unless $cmd =~ /^\|\|/;
$cmd =~ s/^\|+\s*//;
redo PIPE; };
# XXX Local variants do not work!
$cmd =~ s/^t\s/\$DB::trace = 1;\n/;
$cmd =~ s/^s\s/\$DB::single = 1;\n/ && do {$laststep = 's'};
$cmd =~ s/^n\s/\$DB::single = 2;\n/ && do {$laststep = 'n'};
} # PIPE:
#} # <-- Do we know what this brace is for?
$evalarg = "\$^D = \$^D | \$DB::db_stop;\n$cmd"; &eval;
if ($onetimeDump) {
$onetimeDump = undef;
} else {
print $OUT "\n";
}
} continue { # CMD:
if ($piped) {
if ($pager =~ /^\|/) {
$?= 0; close(OUT) || &warn("Can't close DB::OUT");
&warn( "Pager `$pager' failed: ",
($?>>8) > 128 ? ($?>>8)-256 : ($?>>8),
( $? & 128 ) ? " (core dumped)" : "",
( $? & 127 ) ? " (SIG ".($?&127).")" : "", "\n" ) if $?;
open(OUT,">&STDOUT") || &warn("Can't restore DB::OUT");
open(STDOUT,">&SAVEOUT") || &warn("Can't restore STDOUT");
$SIG{PIPE}= "DEFAULT" if $SIG{PIPE} eq "DB::catch";
# Will stop ignoring SIGPIPE if done like nohup(1)
# does SIGINT but Perl doesn't give us a choice.
} else {
open(OUT,">&SAVEOUT") || &warn("Can't restore DB::OUT");
}
close(SAVEOUT);
select($selected), $selected= "" unless $selected eq "";
$piped= "";
}
} # CMD:
if ($post) {
$evalarg = $post; &eval;
}
} # if ($single || $signal)
($@, $!, $,, $/, $\, $^W) = @saved;
();
}
# The following code may be executed now:
# BEGIN {warn 4}
sub sub {
print $LINEINFO ' ' x $#stack, "entering $sub\n" if $frame;
push(@stack, $single);
$single &= 1;
$single |= 4 if $#stack == $deep;
if (wantarray) {
@ret = &$sub;
$single |= pop(@stack);
$retctx = "list";
$lastsub = $sub;
print $LINEINFO ' ' x $#stack, "exited $sub\n" if $frame;
@ret;
} else {
$ret = &$sub;
$single |= pop(@stack);
$retctx = "scalar";
$lastsub = $sub;
print $LINEINFO ' ' x $#stack, "exited $sub\n" if $frame;
$ret;
}
}
sub save {
@saved = ($@, $!, $,, $/, $\, $^W);
$, = ""; $/ = "\n"; $\ = ""; $^W = 0;
}
# The following takes its argument via $evalarg to preserve current @_
sub eval {
my @res;
{
local (@stack) = @stack; # guard against recursive debugging
my $otrace = $trace;
my $osingle = $single;
my $od = $^D;
@res = eval "$usercontext $evalarg;\n"; # '\n' for nice recursive debug
$trace = $otrace;
$single = $osingle;
$^D = $od;
}
my $at = $@;
eval "&DB::save";
if ($at) {
print $OUT $at;
} elsif ($onetimeDump) {
dumpit(\@res);
}
}
sub install_breakpoints {
my $filename = shift;
return unless exists $postponed{$filename};
my %break = %{$postponed{$filename}};
for (keys %break) {
my $i = $_;
#if (/\D/) { # Subroutine name
#}
$dbline{$i} = $break{$_}; # Cannot be done before the file is around
}
}
sub dumpit {
local ($savout) = select($OUT);
do 'dumpvar.pl' unless defined &main::dumpValue;
if (defined &main::dumpValue) {
local $frame = 0;
&main::dumpValue(shift);
} else {
print $OUT "dumpvar.pl not available.\n";
}
select ($savout);
}
sub action {
my $action = shift;
while ($action =~ s/\\$//) {
#print $OUT "+ ";
#$action .= "\n";
$action .= &gets;
}
$action;
}
sub gets {
local($.);
#<IN>;
&readline("cont: ");
}
sub system {
# We save, change, then restore STDIN and STDOUT to avoid fork() since
# many non-Unix systems can do system() but have problems with fork().
open(SAVEIN,"<&STDIN") || &warn("Can't save STDIN");
open(SAVEOUT,">&OUT") || &warn("Can't save STDOUT");
open(STDIN,"<&IN") || &warn("Can't redirect STDIN");
open(STDOUT,">&OUT") || &warn("Can't redirect STDOUT");
system(@_);
open(STDIN,"<&SAVEIN") || &warn("Can't restore STDIN");
open(STDOUT,">&SAVEOUT") || &warn("Can't restore STDOUT");
close(SAVEIN); close(SAVEOUT);
&warn( "(Command returned ", ($?>>8) > 128 ? ($?>>8)-256 : ($?>>8), ")",
( $? & 128 ) ? " (core dumped)" : "",
( $? & 127 ) ? " (SIG ".($?&127).")" : "", "\n" ) if $?;
$?;
}
sub setterm {
local $frame = 0;
eval "require Term::ReadLine;" or die $@;
if ($notty) {
if ($tty) {
open(IN,"<$tty") or die "Cannot open TTY `$TTY' for read: $!";
open(OUT,">$tty") or die "Cannot open TTY `$TTY' for write: $!";
$IN = \*IN;
$OUT = \*OUT;
my $sel = select($OUT);
$| = 1;
select($sel);
} else {
eval "require Term::Rendezvous;" or die $@;
my $rv = $ENV{PERLDB_NOTTY} || "/tmp/perldbtty$$";
my $term_rv = new Term::Rendezvous $rv;
$IN = $term_rv->IN;
$OUT = $term_rv->OUT;
}
}
if (!$rl) {
$term = new Term::ReadLine::Stub 'perldb', $IN, $OUT;
} else {
$term = new Term::ReadLine 'perldb', $IN, $OUT;
$readline::rl_basic_word_break_characters .= "[:"
if defined $readline::rl_basic_word_break_characters
and index($readline::rl_basic_word_break_characters, ":") == -1;
}
$LINEINFO = $OUT unless defined $LINEINFO;
$lineinfo = $console unless defined $lineinfo;
$term->MinLine(2);
if ($term->Features->{setHistory} and "@hist" ne "?") {
$term->SetHistory(@hist);
}
}
sub readline {
if (@typeahead) {
my $left = @typeahead;
my $got = shift @typeahead;
print $OUT "auto(-$left)", shift, $got, "\n";
$term->AddHistory($got)
if length($got) > 1 and defined $term->Features->{addHistory};
return $got;
}
local $frame = 0;
$term->readline(@_);
}
sub dump_option {
my ($opt, $val)= @_;
if (defined $optionVars{$opt}
and defined $ {$optionVars{$opt}}) {
$val = $ {$optionVars{$opt}};
} elsif (defined $optionAction{$opt}
and defined &{$optionAction{$opt}}) {
$val = &{$optionAction{$opt}}();
} elsif (defined $optionAction{$opt}
and not defined $option{$opt}
or defined $optionVars{$opt}
and not defined $ {$optionVars{$opt}}) {
$val = 'N/A';
} else {
$val = $option{$opt};
}
$val =~ s/[\\\']/\\$&/g;
printf $OUT "%20s = '%s'\n", $opt, $val;
}
sub parse_options {
local($_)= @_;
while ($_ ne "") {
s/^(\w+)(\s*$|\W)// or print($OUT "Invalid option `$_'\n"), last;
my ($opt,$sep) = ($1,$2);
my $val;
if ("?" eq $sep) {
print($OUT "Option query `$opt?' followed by non-space `$_'\n"), last
if /^\S/;
#&dump_option($opt);
} elsif ($sep !~ /\S/) {
$val = "1";
} elsif ($sep eq "=") {
s/^(\S*)($|\s+)//;
$val = $1;
} else { #{ to "let some poor schmuck bounce on the % key in B<vi>."
my ($end) = "\\" . substr( ")]>}$sep", index("([<{",$sep), 1 ); #}
s/^(([^\\$end]|\\[\\$end])*)$end($|\s+)// or
print($OUT "Unclosed option value `$opt$sep$_'\n"), last;
$val = $1;
$val =~ s/\\([\\$end])/$1/g;
}
my ($option);
my $matches =
grep( /^\Q$opt/ && ($option = $_), @options );
$matches = grep( /^\Q$opt/i && ($option = $_), @options )
unless $matches;
print $OUT "Unknown option `$opt'\n" unless $matches;
print $OUT "Ambiguous option `$opt'\n" if $matches > 1;
$option{$option} = $val if $matches == 1 and defined $val;
eval "local \$frame = 0; require '$optionRequire{$option}'"
if $matches == 1 and defined $optionRequire{$option} and defined $val;
$ {$optionVars{$option}} = $val
if $matches == 1
and defined $optionVars{$option} and defined $val;
& {$optionAction{$option}} ($val)
if $matches == 1
and defined $optionAction{$option}
and defined &{$optionAction{$option}} and defined $val;
&dump_option($option) if $matches == 1 && $OUT ne \*STDERR; # Not $rcfile
s/^\s+//;
}
}
sub set_list {
my ($stem,@list) = @_;
my $val;
$ENV{"$ {stem}_n"} = @list;
for $i (0 .. $#list) {
$val = $list[$i];
$val =~ s/\\/\\\\/g;
$val =~ s/[\0-\37\177\200-\377]/"\\0x" . unpack('H2',$&)/eg;
$ENV{"$ {stem}_$i"} = $val;
}
}
sub get_list {
my $stem = shift;
my @list;
my $n = delete $ENV{"$ {stem}_n"};
my $val;
for $i (0 .. $n - 1) {
$val = delete $ENV{"$ {stem}_$i"};
$val =~ s/\\((\\)|0x(..))/ $2 ? $2 : pack('H2', $3) /ge;
push @list, $val;
}
@list;
}
sub catch {
$signal = 1;
}
sub warn {
my($msg)= join("",@_);
$msg .= ": $!\n" unless $msg =~ /\n$/;
print $OUT $msg;
}
sub TTY {
if ($term) {
&warn("Too late to set TTY!\n") if @_;
} else {
$tty = shift if @_;
}
$tty or $console;
}
sub noTTY {
if ($term) {
&warn("Too late to set noTTY!\n") if @_;
} else {
$notty = shift if @_;
}
$notty;
}
sub ReadLine {
if ($term) {
&warn("Too late to set ReadLine!\n") if @_;
} else {
$rl = shift if @_;
}
$rl;
}
sub NonStop {
if ($term) {
&warn("Too late to set up NonStop mode!\n") if @_;
} else {
$runnonstop = shift if @_;
}
$runnonstop;
}
sub pager {
if (@_) {
$pager = shift;
$pager="|".$pager unless $pager =~ /^(\+?\>|\|)/;
}
$pager;
}
sub shellBang {
if (@_) {
$sh = quotemeta shift;
$sh .= "\\b" if $sh =~ /\w$/;
}
$psh = $sh;
$psh =~ s/\\b$//;
$psh =~ s/\\(.)/$1/g;
&sethelp;
$psh;
}
sub recallCommand {
if (@_) {
$rc = quotemeta shift;
$rc .= "\\b" if $rc =~ /\w$/;
}
$prc = $rc;
$prc =~ s/\\b$//;
$prc =~ s/\\(.)/$1/g;
&sethelp;
$prc;
}
sub LineInfo {
return $lineinfo unless @_;
$lineinfo = shift;
my $stream = ($lineinfo =~ /^(\+?\>|\|)/) ? $lineinfo : ">$lineinfo";
$emacs = ($stream =~ /^\|/);
open(LINEINFO, "$stream") || &warn("Cannot open `$stream' for write");
$LINEINFO = \*LINEINFO;
my $save = select($LINEINFO);
$| = 1;
select($save);
$lineinfo;
}
sub sethelp {
$help = "
T Stack trace.
s [expr] Single step [in expr].
n [expr] Next, steps over subroutine calls [in expr].
<CR> Repeat last n or s command.
r Return from current subroutine.
c [line] Continue; optionally inserts a one-time-only breakpoint
at the specified line.
l min+incr List incr+1 lines starting at min.
l min-max List lines min through max.
l line List single line.
l subname List first window of lines from subroutine.
l List next window of lines.
- List previous window of lines.
w [line] List window around line.
. Return to the executed line.
f filename Switch to viewing filename.
/pattern/ Search forwards for pattern; final / is optional.
?pattern? Search backwards for pattern; final ? is optional.
L List all breakpoints and actions for the current file.
S [[!]pattern] List subroutine names [not] matching pattern.
t Toggle trace mode.
t expr Trace through execution of expr.
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 the breakpoint for line.
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).
Use ~pattern and !pattern for positive and negative regexps.
X [vars] Same as \"V currentpackage [vars]\".
x expr Evals expression in array context, dumps the result.
O [opt[=val]] [opt\"val\"] [opt?]...
Set or query values of options. val defaults to 1. opt can
be abbreviated. Several options can be listed.
recallCommand, ShellBang: chars used to recall command or spawn shell;
pager: program for output of \"|cmd\";
The following options affect what happens with V, X, and x commands:
arrayDepth, hashDepth: print only first N elements ('' for all);
compactDump, veryCompact: change style of array and hash dump;
globPrint: whether to print contents of globs;
DumpDBFiles: dump arrays holding debugged files;
DumpPackages: dump symbol tables of packages;
quote, HighBit, undefPrint: change style of string dump;
tkRunning: run Tk while prompting (with ReadLine);
signalLevel warnLevel dieLevel: level of verbosity;
Option PrintRet affects printing of return value after r command,
frame affects printing messages on entry and exit from subroutines.
During startup options are initialized from \$ENV{PERLDB_OPTS}.
You can put additional initialization options TTY, noTTY,
ReadLine, and NonStop there.
< command Define command to run before each prompt.
> command Define command to run after each prompt.
$prc number Redo a previous command (default previous command).
$prc -number Redo number'th-to-last command.
$prc pattern Redo last command that started with pattern.
See 'O recallCommand' too.
$psh$psh cmd Run cmd in a subprocess (reads from DB::IN, writes to DB::OUT)"
. ( $rc eq $sh ? "" : "
$psh [cmd] Run cmd in subshell (forces \"\$SHELL -c 'cmd'\")." ) . "
See 'O shellBang' too.
H -number Display last number commands (default all).
p expr Same as \"print DB::OUT expr\" in current package.
|dbcmd Run debugger command, piping DB::OUT to current pager.
||dbcmd Same as |dbcmd but DB::OUT is temporarilly select()ed as well.
\= [alias value] Define a command alias, or list current aliases.
command Execute as a perl statement in current package.
R Pure-man-restart of debugger, debugger state and command-line
options are lost.
h [db_command] Get help [on a specific debugger command], enter |h to page.
h h Summary of debugger commands.
q or ^D Quit.
";
$summary = <<"END_SUM";
List/search source lines: Control script execution:
l [ln|sub] List source code T Stack trace
- or . List previous/current line s [expr] Single step [in expr]
w [line] List around line n [expr] Next, steps over subs
f filename View source in file <CR> Repeat last n or s
/pattern/ Search forward r Return from subroutine
?pattern? Search backward c [line] Continue until line
Debugger controls: L List break pts & actions
O [...] Set debugger options t [expr] Toggle trace [trace expr]
< command Command for before prompt b [ln] [c] Set breakpoint
> command Command for after prompt b sub [c] Set breakpoint for sub
$prc [N|pat] Redo a previous command d [line] Delete a breakpoint
H [-num] Display last num commands D Delete all breakpoints
= [a val] Define/list an alias a [ln] cmd Do cmd before line
h [db_cmd] Get help on command A Delete all actions
|[|]dbcmd Send output to pager $psh\[$psh\] syscmd Run cmd in a subprocess
q or ^D Quit R Attempt a restart
Data Examination: expr Execute perl code, also see: s,n,t expr
S [[!]pat] List subroutine names [not] matching pattern
V [Pk [Vars]] List Variables in Package. Vars can be ~pattern or !pattern.
X [Vars] Same as \"V current_package [Vars]\".
x expr Evals expression in array context, dumps the result.
p expr Print expression (uses script's current package).
END_SUM
# '); # Fix balance of Emacs parsing
}
sub diesignal {
local $frame = 0;
$SIG{'ABRT'} = DEFAULT;
kill 'ABRT', $$ if $panic++;
print $DB::OUT "Got $_[0]!\n"; # in the case cannot continue
local $SIG{__WARN__} = '';
require Carp;
local $Carp::CarpLevel = 2; # mydie + confess
&warn(Carp::longmess("Signal @_"));
kill 'ABRT', $$;
}
sub dbwarn {
local $frame = 0;
local $SIG{__WARN__} = '';
require Carp;
#&warn("Entering dbwarn\n");
my ($mysingle,$mytrace) = ($single,$trace);
$single = 0; $trace = 0;
my $mess = Carp::longmess(@_);
($single,$trace) = ($mysingle,$mytrace);
#&warn("Warning in dbwarn\n");
&warn($mess);
#&warn("Exiting dbwarn\n");
}
sub dbdie {
local $frame = 0;
local $SIG{__DIE__} = '';
local $SIG{__WARN__} = '';
my $i = 0; my $ineval = 0; my $sub;
#&warn("Entering dbdie\n");
if ($dieLevel != 2) {
while ((undef,undef,undef,$sub) = caller(++$i)) {
$ineval = 1, last if $sub eq '(eval)';
}
{
local $SIG{__WARN__} = \&dbwarn;
&warn(@_) if $dieLevel > 2; # Ineval is false during destruction?
}
#&warn("dieing quietly in dbdie\n") if $ineval and $dieLevel < 2;
die @_ if $ineval and $dieLevel < 2;
}
require Carp;
# We do not want to debug this chunk (automatic disabling works
# inside DB::DB, but not in Carp).
my ($mysingle,$mytrace) = ($single,$trace);
$single = 0; $trace = 0;
my $mess = Carp::longmess(@_);
($single,$trace) = ($mysingle,$mytrace);
#&warn("dieing loudly in dbdie\n");
die $mess;
}
sub warnLevel {
if (@_) {
$prevwarn = $SIG{__WARN__} unless $warnLevel;
$warnLevel = shift;
if ($warnLevel) {
$SIG{__WARN__} = 'DB::dbwarn';
} else {
$SIG{__WARN__} = $prevwarn;
}
}
$warnLevel;
}
sub dieLevel {
if (@_) {
$prevdie = $SIG{__DIE__} unless $dieLevel;
$dieLevel = shift;
if ($dieLevel) {
$SIG{__DIE__} = 'DB::dbdie'; # if $dieLevel < 2;
#$SIG{__DIE__} = 'DB::diehard' if $dieLevel >= 2;
print $OUT "Stack dump during die enabled",
( $dieLevel == 1 ? " outside of evals" : ""), ".\n";
print $OUT "Dump printed too.\n" if $dieLevel > 2;
} else {
$SIG{__DIE__} = $prevdie;
print $OUT "Default die handler restored.\n";
}
}
$dieLevel;
}
sub signalLevel {
if (@_) {
$prevsegv = $SIG{SEGV} unless $signalLevel;
$prevbus = $SIG{BUS} unless $signalLevel;
$signalLevel = shift;
if ($signalLevel) {
$SIG{SEGV} = 'DB::diesignal';
$SIG{BUS} = 'DB::diesignal';
} else {
$SIG{SEGV} = $prevsegv;
$SIG{BUS} = $prevbus;
}
}
$signalLevel;
}
# The following BEGIN is very handy if debugger goes havoc, debugging debugger?
BEGIN { # This does not compile, alas.
$IN = \*STDIN; # For bugs before DB::OUT has been opened
$OUT = \*STDERR; # For errors before DB::OUT has been opened
$sh = '!';
$rc = ',';
@hist = ('?');
$deep = 100; # warning if stack gets this deep
$window = 10;
$preview = 3;
$sub = '';
#$SIG{__WARN__} = "DB::dbwarn";
#$SIG{__DIE__} = 'DB::dbdie';
#$SIG{SEGV} = "DB::diesignal";
#$SIG{BUS} = "DB::diesignal";
$SIG{INT} = "DB::catch";
#$SIG{FPE} = "DB::catch";
#warn "SIGFPE installed";
$warnLevel = 1 unless defined $warnLevel;
$dieLevel = 1 unless defined $dieLevel;
$signalLevel = 1 unless defined $signalLevel;
$db_stop = 0; # Compiler warning
$db_stop = 1 << 30;
$level = 0; # Level of recursive debugging
}
BEGIN {$^W = $ini_warn;} # Switch warnings back
#use Carp; # This did break, left for debuggin
1;