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3a01d88c WJ |
1 | package DB; |
2 | ||
3 | # modified Perl debugger, to be run from Emacs in perldb-mode | |
4 | # Ray Lischner (uunet!mntgfx!lisch) as of 5 Nov 1990 | |
5 | # Johan Vromans -- upgrade to 4.0 pl 10 | |
6 | ||
7 | $header = '$RCSfile: perldb.pl,v $$Revision: 4.0.1.2 $$Date: 91/11/05 17:55:58 $'; | |
8 | # | |
9 | # This file is automatically included if you do perl -d. | |
10 | # It's probably not useful to include this yourself. | |
11 | # | |
12 | # Perl supplies the values for @line and %sub. It effectively inserts | |
13 | # a do DB'DB(<linenum>); in front of every place that can | |
14 | # have a breakpoint. It also inserts a do 'perldb.pl' before the first line. | |
15 | # | |
16 | # $Log: perldb.pl,v $ | |
17 | # Revision 4.0.1.2 91/11/05 17:55:58 lwall | |
18 | # patch11: perldb.pl modified to run within emacs in perldb-mode | |
19 | # | |
20 | # Revision 4.0.1.1 91/06/07 11:17:44 lwall | |
21 | # patch4: added $^P variable to control calling of perldb routines | |
22 | # patch4: debugger sometimes listed wrong number of lines for a statement | |
23 | # | |
24 | # Revision 4.0 91/03/20 01:25:50 lwall | |
25 | # 4.0 baseline. | |
26 | # | |
27 | # Revision 3.0.1.6 91/01/11 18:08:58 lwall | |
28 | # patch42: @_ couldn't be accessed from debugger | |
29 | # | |
30 | # Revision 3.0.1.5 90/11/10 01:40:26 lwall | |
31 | # patch38: the debugger wouldn't stop correctly or do action routines | |
32 | # | |
33 | # Revision 3.0.1.4 90/10/15 17:40:38 lwall | |
34 | # patch29: added caller | |
35 | # patch29: the debugger now understands packages and evals | |
36 | # patch29: scripts now run at almost full speed under the debugger | |
37 | # patch29: more variables are settable from debugger | |
38 | # | |
39 | # Revision 3.0.1.3 90/08/09 04:00:58 lwall | |
40 | # patch19: debugger now allows continuation lines | |
41 | # patch19: debugger can now dump lists of variables | |
42 | # patch19: debugger can now add aliases easily from prompt | |
43 | # | |
44 | # Revision 3.0.1.2 90/03/12 16:39:39 lwall | |
45 | # patch13: perl -d didn't format stack traces of *foo right | |
46 | # patch13: perl -d wiped out scalar return values of subroutines | |
47 | # | |
48 | # Revision 3.0.1.1 89/10/26 23:14:02 lwall | |
49 | # patch1: RCS expanded an unintended $Header in lib/perldb.pl | |
50 | # | |
51 | # Revision 3.0 89/10/18 15:19:46 lwall | |
52 | # 3.0 baseline | |
53 | # | |
54 | # Revision 2.0 88/06/05 00:09:45 root | |
55 | # Baseline version 2.0. | |
56 | # | |
57 | # | |
58 | ||
59 | open(IN, "</dev/tty") || open(IN, "<&STDIN"); # so we don't dingle stdin | |
60 | open(OUT,">/dev/tty") || open(OUT, ">&STDOUT"); # so we don't dongle stdout | |
61 | select(OUT); | |
62 | $| = 1; # for DB'OUT | |
63 | select(STDOUT); | |
64 | $| = 1; # for real STDOUT | |
65 | $sub = ''; | |
66 | ||
67 | # Is Perl being run from Emacs? | |
68 | $emacs = $main'ARGV[$[] eq '-emacs'; | |
69 | shift(@main'ARGV) if $emacs; | |
70 | ||
71 | $header =~ s/.Header: ([^,]+),v(\s+\S+\s+\S+).*$/$1$2/; | |
72 | print OUT "\nLoading DB routines from $header\n"; | |
73 | print OUT ("Emacs support ", | |
74 | $emacs ? "enabled" : "available", | |
75 | ".\n"); | |
76 | print OUT "\nEnter h for help.\n\n"; | |
77 | ||
78 | sub DB { | |
79 | &save; | |
80 | ($package, $filename, $line) = caller; | |
81 | $usercontext = '($@, $!, $[, $,, $/, $\) = @saved;' . | |
82 | "package $package;"; # this won't let them modify, alas | |
83 | local($^P) = 0; # don't debug our own evals | |
84 | local(*dbline) = "_<$filename"; | |
85 | $max = $#dbline; | |
86 | if (($stop,$action) = split(/\0/,$dbline{$line})) { | |
87 | if ($stop eq '1') { | |
88 | $signal |= 1; | |
89 | } | |
90 | else { | |
91 | $evalarg = "\$DB'signal |= do {$stop;}"; &eval; | |
92 | $dbline{$line} =~ s/;9($|\0)/$1/; | |
93 | } | |
94 | } | |
95 | if ($single || $trace || $signal) { | |
96 | if ($emacs) { | |
97 | print OUT "\032\032$filename:$line:0\n"; | |
98 | } else { | |
99 | print OUT "$package'" unless $sub =~ /'/; | |
100 | print OUT "$sub($filename:$line):\t",$dbline[$line]; | |
101 | for ($i = $line + 1; $i <= $max && $dbline[$i] == 0; ++$i) { | |
102 | last if $dbline[$i] =~ /^\s*(}|#|\n)/; | |
103 | print OUT "$sub($filename:$i):\t",$dbline[$i]; | |
104 | } | |
105 | } | |
106 | } | |
107 | $evalarg = $action, &eval if $action; | |
108 | if ($single || $signal) { | |
109 | $evalarg = $pre, &eval if $pre; | |
110 | print OUT $#stack . " levels deep in subroutine calls!\n" | |
111 | if $single & 4; | |
112 | $start = $line; | |
113 | CMD: | |
114 | while ((print OUT " DB<", $#hist+1, "> "), $cmd=&gets) { | |
115 | { | |
116 | $single = 0; | |
117 | $signal = 0; | |
118 | $cmd eq '' && exit 0; | |
119 | chop($cmd); | |
120 | $cmd =~ s/\\$// && do { | |
121 | print OUT " cont: "; | |
122 | $cmd .= &gets; | |
123 | redo CMD; | |
124 | }; | |
125 | $cmd =~ /^q$/ && exit 0; | |
126 | $cmd =~ /^$/ && ($cmd = $laststep); | |
127 | push(@hist,$cmd) if length($cmd) > 1; | |
128 | ($i) = split(/\s+/,$cmd); | |
129 | eval "\$cmd =~ $alias{$i}", print OUT $@ if $alias{$i}; | |
130 | $cmd =~ /^h$/ && do { | |
131 | print OUT " | |
132 | T Stack trace. | |
133 | s Single step. | |
134 | n Next, steps over subroutine calls. | |
135 | r Return from current subroutine. | |
136 | c [line] Continue; optionally inserts a one-time-only breakpoint | |
137 | at the specified line. | |
138 | <CR> Repeat last n or s. | |
139 | l min+incr List incr+1 lines starting at min. | |
140 | l min-max List lines. | |
141 | l line List line; | |
142 | l List next window. | |
143 | - List previous window. | |
144 | w line List window around line. | |
145 | l subname List subroutine. | |
146 | f filename Switch to filename. | |
147 | /pattern/ Search forwards for pattern; final / is optional. | |
148 | ?pattern? Search backwards for pattern. | |
149 | L List breakpoints and actions. | |
150 | S List subroutine names. | |
151 | t Toggle trace mode. | |
152 | b [line] [condition] | |
153 | Set breakpoint; line defaults to the current execution line; | |
154 | condition breaks if it evaluates to true, defaults to \'1\'. | |
155 | b subname [condition] | |
156 | Set breakpoint at first line of subroutine. | |
157 | d [line] Delete breakpoint. | |
158 | D Delete all breakpoints. | |
159 | a [line] command | |
160 | Set an action to be done before the line is executed. | |
161 | Sequence is: check for breakpoint, print line if necessary, | |
162 | do action, prompt user if breakpoint or step, evaluate line. | |
163 | A Delete all actions. | |
164 | V [pkg [vars]] List some (default all) variables in package (default current). | |
165 | X [vars] Same as \"V currentpackage [vars]\". | |
166 | < command Define command before prompt. | |
167 | > command Define command after prompt. | |
168 | ! number Redo command (default previous command). | |
169 | ! -number Redo number\'th to last command. | |
170 | H -number Display last number commands (default all). | |
171 | q or ^D Quit. | |
172 | p expr Same as \"print DB'OUT expr\" in current package. | |
173 | = [alias value] Define a command alias, or list current aliases. | |
174 | command Execute as a perl statement in current package. | |
175 | ||
176 | "; | |
177 | next CMD; }; | |
178 | $cmd =~ /^t$/ && do { | |
179 | $trace = !$trace; | |
180 | print OUT "Trace = ".($trace?"on":"off")."\n"; | |
181 | next CMD; }; | |
182 | $cmd =~ /^S$/ && do { | |
183 | foreach $subname (sort(keys %sub)) { | |
184 | print OUT $subname,"\n"; | |
185 | } | |
186 | next CMD; }; | |
187 | $cmd =~ s/^X\b/V $package/; | |
188 | $cmd =~ /^V$/ && do { | |
189 | $cmd = 'V $package'; }; | |
190 | $cmd =~ /^V\b\s*(\S+)\s*(.*)/ && do { | |
191 | $packname = $1; | |
192 | @vars = split(' ',$2); | |
193 | do 'dumpvar.pl' unless defined &main'dumpvar; | |
194 | if (defined &main'dumpvar) { | |
195 | &main'dumpvar($packname,@vars); | |
196 | } | |
197 | else { | |
198 | print DB'OUT "dumpvar.pl not available.\n"; | |
199 | } | |
200 | next CMD; }; | |
201 | $cmd =~ /^f\b\s*(.*)/ && do { | |
202 | $file = $1; | |
203 | if (!$file) { | |
204 | print OUT "The old f command is now the r command.\n"; | |
205 | print OUT "The new f command switches filenames.\n"; | |
206 | next CMD; | |
207 | } | |
208 | if (!defined $_main{'_<' . $file}) { | |
209 | if (($try) = grep(m#^_<.*$file#, keys %_main)) { | |
210 | $file = substr($try,2); | |
211 | print "\n$file:\n"; | |
212 | } | |
213 | } | |
214 | if (!defined $_main{'_<' . $file}) { | |
215 | print OUT "There's no code here anything matching $file.\n"; | |
216 | next CMD; | |
217 | } | |
218 | elsif ($file ne $filename) { | |
219 | *dbline = "_<$file"; | |
220 | $max = $#dbline; | |
221 | $filename = $file; | |
222 | $start = 1; | |
223 | $cmd = "l"; | |
224 | } }; | |
225 | $cmd =~ /^l\b\s*(['A-Za-z_]['\w]*)/ && do { | |
226 | $subname = $1; | |
227 | $subname = "main'" . $subname unless $subname =~ /'/; | |
228 | $subname = "main" . $subname if substr($subname,0,1) eq "'"; | |
229 | ($file,$subrange) = split(/:/,$sub{$subname}); | |
230 | if ($file ne $filename) { | |
231 | *dbline = "_<$file"; | |
232 | $max = $#dbline; | |
233 | $filename = $file; | |
234 | } | |
235 | if ($subrange) { | |
236 | if (eval($subrange) < -$window) { | |
237 | $subrange =~ s/-.*/+/; | |
238 | } | |
239 | $cmd = "l $subrange"; | |
240 | } else { | |
241 | print OUT "Subroutine $1 not found.\n"; | |
242 | next CMD; | |
243 | } }; | |
244 | $cmd =~ /^w\b\s*(\d*)$/ && do { | |
245 | $incr = $window - 1; | |
246 | $start = $1 if $1; | |
247 | $start -= $preview; | |
248 | $cmd = 'l ' . $start . '-' . ($start + $incr); }; | |
249 | $cmd =~ /^-$/ && do { | |
250 | $incr = $window - 1; | |
251 | $cmd = 'l ' . ($start-$window*2) . '+'; }; | |
252 | $cmd =~ /^l$/ && do { | |
253 | $incr = $window - 1; | |
254 | $cmd = 'l ' . $start . '-' . ($start + $incr); }; | |
255 | $cmd =~ /^l\b\s*(\d*)\+(\d*)$/ && do { | |
256 | $start = $1 if $1; | |
257 | $incr = $2; | |
258 | $incr = $window - 1 unless $incr; | |
259 | $cmd = 'l ' . $start . '-' . ($start + $incr); }; | |
260 | $cmd =~ /^l\b\s*(([\d\$\.]+)([-,]([\d\$\.]+))?)?/ && do { | |
261 | $end = (!$2) ? $max : ($4 ? $4 : $2); | |
262 | $end = $max if $end > $max; | |
263 | $i = $2; | |
264 | $i = $line if $i eq '.'; | |
265 | $i = 1 if $i < 1; | |
266 | if ($emacs) { | |
267 | print OUT "\032\032$filename:$i:0\n"; | |
268 | $i = $end; | |
269 | } else { | |
270 | for (; $i <= $end; $i++) { | |
271 | print OUT "$i:\t", $dbline[$i]; | |
272 | last if $signal; | |
273 | } | |
274 | } | |
275 | $start = $i; # remember in case they want more | |
276 | $start = $max if $start > $max; | |
277 | next CMD; }; | |
278 | $cmd =~ /^D$/ && do { | |
279 | print OUT "Deleting all breakpoints...\n"; | |
280 | for ($i = 1; $i <= $max ; $i++) { | |
281 | if (defined $dbline{$i}) { | |
282 | $dbline{$i} =~ s/^[^\0]+//; | |
283 | if ($dbline{$i} =~ s/^\0?$//) { | |
284 | delete $dbline{$i}; | |
285 | } | |
286 | } | |
287 | } | |
288 | next CMD; }; | |
289 | $cmd =~ /^L$/ && do { | |
290 | for ($i = 1; $i <= $max; $i++) { | |
291 | if (defined $dbline{$i}) { | |
292 | print OUT "$i:\t", $dbline[$i]; | |
293 | ($stop,$action) = split(/\0/, $dbline{$i}); | |
294 | print OUT " break if (", $stop, ")\n" | |
295 | if $stop; | |
296 | print OUT " action: ", $action, "\n" | |
297 | if $action; | |
298 | last if $signal; | |
299 | } | |
300 | } | |
301 | next CMD; }; | |
302 | $cmd =~ /^b\b\s*(['A-Za-z_]['\w]*)\s*(.*)/ && do { | |
303 | $subname = $1; | |
304 | $cond = $2 || '1'; | |
305 | $subname = "$package'" . $subname unless $subname =~ /'/; | |
306 | $subname = "main" . $subname if substr($subname,0,1) eq "'"; | |
307 | ($filename,$i) = split(/[:-]/, $sub{$subname}); | |
308 | if ($i) { | |
309 | *dbline = "_<$filename"; | |
310 | ++$i while $dbline[$i] == 0 && $i < $#dbline; | |
311 | $dbline{$i} =~ s/^[^\0]*/$cond/; | |
312 | } else { | |
313 | print OUT "Subroutine $subname not found.\n"; | |
314 | } | |
315 | next CMD; }; | |
316 | $cmd =~ /^b\b\s*(\d*)\s*(.*)/ && do { | |
317 | $i = ($1?$1:$line); | |
318 | $cond = $2 || '1'; | |
319 | if ($dbline[$i] == 0) { | |
320 | print OUT "Line $i not breakable.\n"; | |
321 | } else { | |
322 | $dbline{$i} =~ s/^[^\0]*/$cond/; | |
323 | } | |
324 | next CMD; }; | |
325 | $cmd =~ /^d\b\s*(\d+)?/ && do { | |
326 | $i = ($1?$1:$line); | |
327 | $dbline{$i} =~ s/^[^\0]*//; | |
328 | delete $dbline{$i} if $dbline{$i} eq ''; | |
329 | next CMD; }; | |
330 | $cmd =~ /^A$/ && do { | |
331 | for ($i = 1; $i <= $max ; $i++) { | |
332 | if (defined $dbline{$i}) { | |
333 | $dbline{$i} =~ s/\0[^\0]*//; | |
334 | delete $dbline{$i} if $dbline{$i} eq ''; | |
335 | } | |
336 | } | |
337 | next CMD; }; | |
338 | $cmd =~ /^<\s*(.*)/ && do { | |
339 | $pre = do action($1); | |
340 | next CMD; }; | |
341 | $cmd =~ /^>\s*(.*)/ && do { | |
342 | $post = do action($1); | |
343 | next CMD; }; | |
344 | $cmd =~ /^a\b\s*(\d+)(\s+(.*))?/ && do { | |
345 | $i = $1; | |
346 | if ($dbline[$i] == 0) { | |
347 | print OUT "Line $i may not have an action.\n"; | |
348 | } else { | |
349 | $dbline{$i} =~ s/\0[^\0]*//; | |
350 | $dbline{$i} .= "\0" . do action($3); | |
351 | } | |
352 | next CMD; }; | |
353 | $cmd =~ /^n$/ && do { | |
354 | $single = 2; | |
355 | $laststep = $cmd; | |
356 | last CMD; }; | |
357 | $cmd =~ /^s$/ && do { | |
358 | $single = 1; | |
359 | $laststep = $cmd; | |
360 | last CMD; }; | |
361 | $cmd =~ /^c\b\s*(\d*)\s*$/ && do { | |
362 | $i = $1; | |
363 | if ($i) { | |
364 | if ($dbline[$i] == 0) { | |
365 | print OUT "Line $i not breakable.\n"; | |
366 | next CMD; | |
367 | } | |
368 | $dbline{$i} =~ s/(\0|$)/;9$1/; # add one-time-only b.p. | |
369 | } | |
370 | for ($i=0; $i <= $#stack; ) { | |
371 | $stack[$i++] &= ~1; | |
372 | } | |
373 | last CMD; }; | |
374 | $cmd =~ /^r$/ && do { | |
375 | $stack[$#stack] |= 2; | |
376 | last CMD; }; | |
377 | $cmd =~ /^T$/ && do { | |
378 | local($p,$f,$l,$s,$h,$a,@a,@sub); | |
379 | for ($i = 1; ($p,$f,$l,$s,$h,$w) = caller($i); $i++) { | |
380 | @a = @args; | |
381 | for (@a) { | |
382 | if (/^StB\000/ && length($_) == length($_main{'_main'})) { | |
383 | $_ = sprintf("%s",$_); | |
384 | } | |
385 | else { | |
386 | s/'/\\'/g; | |
387 | s/([^\0]*)/'$1'/ unless /^-?[\d.]+$/; | |
388 | s/([\200-\377])/sprintf("M-%c",ord($1)&0177)/eg; | |
389 | s/([\0-\37\177])/sprintf("^%c",ord($1)^64)/eg; | |
390 | } | |
391 | } | |
392 | $w = $w ? '@ = ' : '$ = '; | |
393 | $a = $h ? '(' . join(', ', @a) . ')' : ''; | |
394 | push(@sub, "$w&$s$a from file $f line $l\n"); | |
395 | last if $signal; | |
396 | } | |
397 | for ($i=0; $i <= $#sub; $i++) { | |
398 | last if $signal; | |
399 | print OUT $sub[$i]; | |
400 | } | |
401 | next CMD; }; | |
402 | $cmd =~ /^\/(.*)$/ && do { | |
403 | $inpat = $1; | |
404 | $inpat =~ s:([^\\])/$:$1:; | |
405 | if ($inpat ne "") { | |
406 | eval '$inpat =~ m'."\n$inpat\n"; | |
407 | if ($@ ne "") { | |
408 | print OUT "$@"; | |
409 | next CMD; | |
410 | } | |
411 | $pat = $inpat; | |
412 | } | |
413 | $end = $start; | |
414 | eval ' | |
415 | for (;;) { | |
416 | ++$start; | |
417 | $start = 1 if ($start > $max); | |
418 | last if ($start == $end); | |
419 | if ($dbline[$start] =~ m'."\n$pat\n".'i) { | |
420 | if ($emacs) { | |
421 | print OUT "\032\032$filename:$start:0\n"; | |
422 | } else { | |
423 | print OUT "$start:\t", $dbline[$start], "\n"; | |
424 | } | |
425 | last; | |
426 | } | |
427 | } '; | |
428 | print OUT "/$pat/: not found\n" if ($start == $end); | |
429 | next CMD; }; | |
430 | $cmd =~ /^\?(.*)$/ && do { | |
431 | $inpat = $1; | |
432 | $inpat =~ s:([^\\])\?$:$1:; | |
433 | if ($inpat ne "") { | |
434 | eval '$inpat =~ m'."\n$inpat\n"; | |
435 | if ($@ ne "") { | |
436 | print OUT "$@"; | |
437 | next CMD; | |
438 | } | |
439 | $pat = $inpat; | |
440 | } | |
441 | $end = $start; | |
442 | eval ' | |
443 | for (;;) { | |
444 | --$start; | |
445 | $start = $max if ($start <= 0); | |
446 | last if ($start == $end); | |
447 | if ($dbline[$start] =~ m'."\n$pat\n".'i) { | |
448 | if ($emacs) { | |
449 | print OUT "\032\032$filename:$start:0\n"; | |
450 | } else { | |
451 | print OUT "$start:\t", $dbline[$start], "\n"; | |
452 | } | |
453 | last; | |
454 | } | |
455 | } '; | |
456 | print OUT "?$pat?: not found\n" if ($start == $end); | |
457 | next CMD; }; | |
458 | $cmd =~ /^!+\s*(-)?(\d+)?$/ && do { | |
459 | pop(@hist) if length($cmd) > 1; | |
460 | $i = ($1?($#hist-($2?$2:1)):($2?$2:$#hist)); | |
461 | $cmd = $hist[$i] . "\n"; | |
462 | print OUT $cmd; | |
463 | redo CMD; }; | |
464 | $cmd =~ /^!(.+)$/ && do { | |
465 | $pat = "^$1"; | |
466 | pop(@hist) if length($cmd) > 1; | |
467 | for ($i = $#hist; $i; --$i) { | |
468 | last if $hist[$i] =~ $pat; | |
469 | } | |
470 | if (!$i) { | |
471 | print OUT "No such command!\n\n"; | |
472 | next CMD; | |
473 | } | |
474 | $cmd = $hist[$i] . "\n"; | |
475 | print OUT $cmd; | |
476 | redo CMD; }; | |
477 | $cmd =~ /^H\b\s*(-(\d+))?/ && do { | |
478 | $end = $2?($#hist-$2):0; | |
479 | $hist = 0 if $hist < 0; | |
480 | for ($i=$#hist; $i>$end; $i--) { | |
481 | print OUT "$i: ",$hist[$i],"\n" | |
482 | unless $hist[$i] =~ /^.?$/; | |
483 | }; | |
484 | next CMD; }; | |
485 | $cmd =~ s/^p( .*)?$/print DB'OUT$1/; | |
486 | $cmd =~ /^=/ && do { | |
487 | if (local($k,$v) = ($cmd =~ /^=\s*(\S+)\s+(.*)/)) { | |
488 | $alias{$k}="s~$k~$v~"; | |
489 | print OUT "$k = $v\n"; | |
490 | } elsif ($cmd =~ /^=\s*$/) { | |
491 | foreach $k (sort keys(%alias)) { | |
492 | if (($v = $alias{$k}) =~ s~^s\~$k\~(.*)\~$~$1~) { | |
493 | print OUT "$k = $v\n"; | |
494 | } else { | |
495 | print OUT "$k\t$alias{$k}\n"; | |
496 | }; | |
497 | }; | |
498 | }; | |
499 | next CMD; }; | |
500 | } | |
501 | $evalarg = $cmd; &eval; | |
502 | print OUT "\n"; | |
503 | } | |
504 | if ($post) { | |
505 | $evalarg = $post; &eval; | |
506 | } | |
507 | } | |
508 | ($@, $!, $[, $,, $/, $\) = @saved; | |
509 | } | |
510 | ||
511 | sub save { | |
512 | @saved = ($@, $!, $[, $,, $/, $\); | |
513 | $[ = 0; $, = ""; $/ = "\n"; $\ = ""; | |
514 | } | |
515 | ||
516 | # The following takes its argument via $evalarg to preserve current @_ | |
517 | ||
518 | sub eval { | |
519 | eval "$usercontext $evalarg; &DB'save"; | |
520 | print OUT $@; | |
521 | } | |
522 | ||
523 | sub action { | |
524 | local($action) = @_; | |
525 | while ($action =~ s/\\$//) { | |
526 | print OUT "+ "; | |
527 | $action .= &gets; | |
528 | } | |
529 | $action; | |
530 | } | |
531 | ||
532 | sub gets { | |
533 | local($.); | |
534 | <IN>; | |
535 | } | |
536 | ||
537 | sub catch { | |
538 | $signal = 1; | |
539 | } | |
540 | ||
541 | sub sub { | |
542 | push(@stack, $single); | |
543 | $single &= 1; | |
544 | $single |= 4 if $#stack == $deep; | |
545 | if (wantarray) { | |
546 | @i = &$sub; | |
547 | $single |= pop(@stack); | |
548 | @i; | |
549 | } | |
550 | else { | |
551 | $i = &$sub; | |
552 | $single |= pop(@stack); | |
553 | $i; | |
554 | } | |
555 | } | |
556 | ||
557 | $single = 1; # so it stops on first executable statement | |
558 | @hist = ('?'); | |
559 | $SIG{'INT'} = "DB'catch"; | |
560 | $deep = 100; # warning if stack gets this deep | |
561 | $window = 10; | |
562 | $preview = 3; | |
563 | ||
564 | @stack = (0); | |
565 | @ARGS = @ARGV; | |
566 | for (@args) { | |
567 | s/'/\\'/g; | |
568 | s/(.*)/'$1'/ unless /^-?[\d.]+$/; | |
569 | } | |
570 | ||
571 | if (-f '.perldb') { | |
572 | do './.perldb'; | |
573 | } | |
574 | elsif (-f "$ENV{'LOGDIR'}/.perldb") { | |
575 | do "$ENV{'LOGDIR'}/.perldb"; | |
576 | } | |
577 | elsif (-f "$ENV{'HOME'}/.perldb") { | |
578 | do "$ENV{'HOME'}/.perldb"; | |
579 | } | |
580 | ||
581 | 1; |