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Diffstat (limited to 'lib/perl5db.pl')
| -rw-r--r-- | lib/perl5db.pl | 569 |
1 files changed, 569 insertions, 0 deletions
diff --git a/lib/perl5db.pl b/lib/perl5db.pl new file mode 100644 index 0000000000..ac03c098fe --- /dev/null +++ b/lib/perl5db.pl @@ -0,0 +1,569 @@ +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: perl5db.pl,v $$Revision: 4.1 $$Date: 92/08/07 18:24:07 $'; +# +# 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. It also inserts a do 'perldb.pl' before the first line. +# +# $Log: perldb.pl,v $ + +local($^W) = 0; + +if (-e "/dev/tty") { + $console = "/dev/tty"; + $rcfile=".perldb"; +} +elsif (-e "con") { + $console = "con"; + $rcfile="perldb.ini"; +} +else { + $console = "sys\$command"; + $rcfile="perldb.ini"; +} + +open(IN, "<$console") || open(IN, "<&STDIN"); # so we don't dingle stdin +open(OUT,">$console") || open(OUT, ">&STDERR") + || open(OUT, ">&STDOUT"); # so we don't dongle stdout +select(OUT); +$| = 1; # for DB::OUT +select(STDOUT); +$| = 1; # for real STDOUT +$sub = ''; + +# Is Perl being run from Emacs? +$emacs = $main::ARGV[0] 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; + $usercontext = '($@, $!, $,, $/, $\, $^W) = @saved;' . + "package $package;"; # this won't let them modify, alas + local(*dbline) = "::_<$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 { + $prefix = $sub =~ /'|::/ ? "" : "${package}::"; + $prefix .= "$sub($filename:"; + if (length($prefix) > 30) { + print OUT "$prefix$line):\n$line:\t",$dbline[$line]; + $prefix = ""; + $infix = ":\t"; + } + else { + $infix = "):\t"; + print OUT "$prefix$line$infix",$dbline[$line]; + } + for ($i = $line + 1; $i <= $max && $dbline[$i] == 0; ++$i) { + last if $dbline[$i] =~ /^\s*(}|#|\n)/; + print OUT "$prefix$i$infix",$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"; }; + $cmd =~ /^V\b\s*(\S+)\s*(.*)/ && do { + local ($savout) = select(OUT); + $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"; + } + select ($savout); + 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 "'"; + $subname = "main" . $subname if substr($subname,0,2)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); }; + $cmd =~ /^-$/ && 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 = (!$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; $i++) { + print OUT "$i:\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'; + $subname = "${package}::" . $subname + unless $subname =~ /'|::/; + $subname = "main" . $subname if substr($subname,0,1) eq "'"; + $subname = "main" . $subname if substr($subname,0,2) eq "::"; + ($filename,$i) = split(/:/, $sub{$subname}); + $i += 0; + if ($i) { + *dbline = "::_<$filename"; + ++$i while $dbline[$i] == 0 && $i < $#dbline; + $dbline{$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 =~ /^<\s*(.*)/ && do { + $pre = action($1); + next CMD; }; + $cmd =~ /^>\s*(.*)/ && do { + $post = action($1); + next CMD; }; + $cmd =~ /^a\b\s*(\d+)(\s+(.*))?/ && do { + $i = $1; + if ($dbline[$i] == 0) { + print OUT "Line $i may not have an action.\n"; + } else { + $dbline{$i} =~ s/\0[^\0]*//; + $dbline{$i} .= "\0" . action($3); + } + next CMD; }; + $cmd =~ /^n$/ && do { + $single = 2; + $laststep = $cmd; + last CMD; }; + $cmd =~ /^s$/ && do { + $single = 1; + $laststep = $cmd; + last CMD; }; + $cmd =~ /^c\b\s*(\d*)\s*$/ && do { + $i = $1; + if ($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] |= 2; + last CMD; }; + $cmd =~ /^T$/ && do { + local($p,$f,$l,$s,$h,$a,@a,@sub); + for ($i = 1; ($p,$f,$l,$s,$h,$w) = caller($i); $i++) { + @a = (); + for $arg (@args) { + $_ = "$arg"; + s/'/\\'/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 = $h ? '(' . join(', ', @a) . ')' : ''; + push(@sub, "$w$s$a from file $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; }; + $cmd =~ /^!+\s*(-)?(\d+)?$/ && 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 = ($@, $!, $,, $/, $\, $^W); + $, = ""; $/ = "\n"; $\ = ""; $^W = 0; +} + +# 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); + $i; + } +} + +$trace = $signal = $single = 0; # uninitialized warning suppression + +@hist = ('?'); +$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; |