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1 | # B.pm |
2 | # |
1a52ab62 |
3 | # Copyright (c) 1996, 1997, 1998 Malcolm Beattie |
a798dbf2 |
4 | # |
5 | # You may distribute under the terms of either the GNU General Public |
6 | # License or the Artistic License, as specified in the README file. |
7 | # |
8 | package B; |
9426adcd |
9 | use XSLoader (); |
a798dbf2 |
10 | require Exporter; |
9426adcd |
11 | @ISA = qw(Exporter); |
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12 | |
f72d64f0 |
13 | # walkoptree_slow comes from B.pm (you are there), |
14 | # walkoptree comes from B.xs |
f6c2d85b |
15 | @EXPORT_OK = qw(minus_c ppname save_BEGINs |
16 | class peekop cast_I32 cstring cchar hash threadsv_names |
b2590c4e |
17 | main_root main_start main_cv svref_2object opnumber |
18 | amagic_generation |
f6c2d85b |
19 | walkoptree_slow walkoptree walkoptree_exec walksymtable |
20 | parents comppadlist sv_undef compile_stats timing_info |
21 | begin_av init_av end_av); |
b2590c4e |
22 | |
4c1f658f |
23 | sub OPf_KIDS (); |
a798dbf2 |
24 | use strict; |
25 | @B::SV::ISA = 'B::OBJECT'; |
26 | @B::NULL::ISA = 'B::SV'; |
27 | @B::PV::ISA = 'B::SV'; |
28 | @B::IV::ISA = 'B::SV'; |
29 | @B::NV::ISA = 'B::IV'; |
30 | @B::RV::ISA = 'B::SV'; |
31 | @B::PVIV::ISA = qw(B::PV B::IV); |
32 | @B::PVNV::ISA = qw(B::PV B::NV); |
33 | @B::PVMG::ISA = 'B::PVNV'; |
34 | @B::PVLV::ISA = 'B::PVMG'; |
35 | @B::BM::ISA = 'B::PVMG'; |
36 | @B::AV::ISA = 'B::PVMG'; |
37 | @B::GV::ISA = 'B::PVMG'; |
38 | @B::HV::ISA = 'B::PVMG'; |
39 | @B::CV::ISA = 'B::PVMG'; |
276493cb |
40 | @B::IO::ISA = 'B::PVMG'; |
41 | @B::FM::ISA = 'B::CV'; |
a798dbf2 |
42 | |
43 | @B::OP::ISA = 'B::OBJECT'; |
44 | @B::UNOP::ISA = 'B::OP'; |
45 | @B::BINOP::ISA = 'B::UNOP'; |
46 | @B::LOGOP::ISA = 'B::UNOP'; |
a798dbf2 |
47 | @B::LISTOP::ISA = 'B::BINOP'; |
48 | @B::SVOP::ISA = 'B::OP'; |
7934575e |
49 | @B::PADOP::ISA = 'B::OP'; |
a798dbf2 |
50 | @B::PVOP::ISA = 'B::OP'; |
51 | @B::CVOP::ISA = 'B::OP'; |
52 | @B::LOOP::ISA = 'B::LISTOP'; |
53 | @B::PMOP::ISA = 'B::LISTOP'; |
54 | @B::COP::ISA = 'B::OP'; |
55 | |
56 | @B::SPECIAL::ISA = 'B::OBJECT'; |
57 | |
58 | { |
59 | # Stop "-w" from complaining about the lack of a real B::OBJECT class |
60 | package B::OBJECT; |
61 | } |
62 | |
63 | my $debug; |
64 | my $op_count = 0; |
65 | my @parents = (); |
66 | |
67 | sub debug { |
68 | my ($class, $value) = @_; |
69 | $debug = $value; |
70 | walkoptree_debug($value); |
71 | } |
72 | |
a798dbf2 |
73 | sub class { |
74 | my $obj = shift; |
75 | my $name = ref $obj; |
76 | $name =~ s/^.*:://; |
77 | return $name; |
78 | } |
79 | |
80 | sub parents { \@parents } |
81 | |
82 | # For debugging |
83 | sub peekop { |
84 | my $op = shift; |
3f872cb9 |
85 | return sprintf("%s (0x%x) %s", class($op), $$op, $op->name); |
a798dbf2 |
86 | } |
87 | |
b2590c4e |
88 | sub walkoptree_slow { |
a798dbf2 |
89 | my($op, $method, $level) = @_; |
90 | $op_count++; # just for statistics |
91 | $level ||= 0; |
92 | warn(sprintf("walkoptree: %d. %s\n", $level, peekop($op))) if $debug; |
93 | $op->$method($level); |
94 | if ($$op && ($op->flags & OPf_KIDS)) { |
95 | my $kid; |
96 | unshift(@parents, $op); |
97 | for ($kid = $op->first; $$kid; $kid = $kid->sibling) { |
b2590c4e |
98 | walkoptree_slow($kid, $method, $level + 1); |
a798dbf2 |
99 | } |
100 | shift @parents; |
101 | } |
102 | } |
103 | |
104 | sub compile_stats { |
105 | return "Total number of OPs processed: $op_count\n"; |
106 | } |
107 | |
108 | sub timing_info { |
109 | my ($sec, $min, $hr) = localtime; |
110 | my ($user, $sys) = times; |
111 | sprintf("%02d:%02d:%02d user=$user sys=$sys", |
112 | $hr, $min, $sec, $user, $sys); |
113 | } |
114 | |
115 | my %symtable; |
2b8dc4d2 |
116 | |
117 | sub clearsym { |
118 | %symtable = (); |
119 | } |
120 | |
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121 | sub savesym { |
122 | my ($obj, $value) = @_; |
123 | # warn(sprintf("savesym: sym_%x => %s\n", $$obj, $value)); # debug |
124 | $symtable{sprintf("sym_%x", $$obj)} = $value; |
125 | } |
126 | |
127 | sub objsym { |
128 | my $obj = shift; |
129 | return $symtable{sprintf("sym_%x", $$obj)}; |
130 | } |
131 | |
132 | sub walkoptree_exec { |
133 | my ($op, $method, $level) = @_; |
134 | my ($sym, $ppname); |
135 | my $prefix = " " x $level; |
136 | for (; $$op; $op = $op->next) { |
137 | $sym = objsym($op); |
138 | if (defined($sym)) { |
139 | print $prefix, "goto $sym\n"; |
140 | return; |
141 | } |
142 | savesym($op, sprintf("%s (0x%lx)", class($op), $$op)); |
143 | $op->$method($level); |
3f872cb9 |
144 | $ppname = $op->name; |
1a67a97c |
145 | if ($ppname =~ |
3f872cb9 |
146 | /^(or|and|mapwhile|grepwhile|entertry|range|cond_expr)$/) |
1a67a97c |
147 | { |
a798dbf2 |
148 | print $prefix, uc($1), " => {\n"; |
149 | walkoptree_exec($op->other, $method, $level + 1); |
150 | print $prefix, "}\n"; |
3f872cb9 |
151 | } elsif ($ppname eq "match" || $ppname eq "subst") { |
a798dbf2 |
152 | my $pmreplstart = $op->pmreplstart; |
153 | if ($$pmreplstart) { |
154 | print $prefix, "PMREPLSTART => {\n"; |
155 | walkoptree_exec($pmreplstart, $method, $level + 1); |
156 | print $prefix, "}\n"; |
157 | } |
3f872cb9 |
158 | } elsif ($ppname eq "substcont") { |
a798dbf2 |
159 | print $prefix, "SUBSTCONT => {\n"; |
160 | walkoptree_exec($op->other->pmreplstart, $method, $level + 1); |
161 | print $prefix, "}\n"; |
162 | $op = $op->other; |
3f872cb9 |
163 | } elsif ($ppname eq "enterloop") { |
a798dbf2 |
164 | print $prefix, "REDO => {\n"; |
165 | walkoptree_exec($op->redoop, $method, $level + 1); |
166 | print $prefix, "}\n", $prefix, "NEXT => {\n"; |
167 | walkoptree_exec($op->nextop, $method, $level + 1); |
168 | print $prefix, "}\n", $prefix, "LAST => {\n"; |
169 | walkoptree_exec($op->lastop, $method, $level + 1); |
170 | print $prefix, "}\n"; |
3f872cb9 |
171 | } elsif ($ppname eq "subst") { |
a798dbf2 |
172 | my $replstart = $op->pmreplstart; |
173 | if ($$replstart) { |
174 | print $prefix, "SUBST => {\n"; |
175 | walkoptree_exec($replstart, $method, $level + 1); |
176 | print $prefix, "}\n"; |
177 | } |
178 | } |
179 | } |
180 | } |
181 | |
182 | sub walksymtable { |
183 | my ($symref, $method, $recurse, $prefix) = @_; |
184 | my $sym; |
0cc1d052 |
185 | my $ref; |
a798dbf2 |
186 | no strict 'vars'; |
187 | local(*glob); |
0cc1d052 |
188 | $prefix = '' unless defined $prefix; |
189 | while (($sym, $ref) = each %$symref) { |
8bac7e00 |
190 | *glob = "*main::".$prefix.$sym; |
a798dbf2 |
191 | if ($sym =~ /::$/) { |
192 | $sym = $prefix . $sym; |
b4e94495 |
193 | if ($sym ne "main::" && $sym ne "<none>::" && &$recurse($sym)) { |
a798dbf2 |
194 | walksymtable(\%glob, $method, $recurse, $sym); |
195 | } |
196 | } else { |
197 | svref_2object(\*glob)->EGV->$method(); |
198 | } |
199 | } |
200 | } |
201 | |
202 | { |
203 | package B::Section; |
204 | my $output_fh; |
205 | my %sections; |
206 | |
207 | sub new { |
208 | my ($class, $section, $symtable, $default) = @_; |
209 | $output_fh ||= FileHandle->new_tmpfile; |
210 | my $obj = bless [-1, $section, $symtable, $default], $class; |
211 | $sections{$section} = $obj; |
212 | return $obj; |
213 | } |
214 | |
215 | sub get { |
216 | my ($class, $section) = @_; |
217 | return $sections{$section}; |
218 | } |
219 | |
220 | sub add { |
221 | my $section = shift; |
222 | while (defined($_ = shift)) { |
223 | print $output_fh "$section->[1]\t$_\n"; |
224 | $section->[0]++; |
225 | } |
226 | } |
227 | |
228 | sub index { |
229 | my $section = shift; |
230 | return $section->[0]; |
231 | } |
232 | |
233 | sub name { |
234 | my $section = shift; |
235 | return $section->[1]; |
236 | } |
237 | |
238 | sub symtable { |
239 | my $section = shift; |
240 | return $section->[2]; |
241 | } |
242 | |
243 | sub default { |
244 | my $section = shift; |
245 | return $section->[3]; |
246 | } |
247 | |
248 | sub output { |
249 | my ($section, $fh, $format) = @_; |
250 | my $name = $section->name; |
251 | my $sym = $section->symtable || {}; |
252 | my $default = $section->default; |
253 | |
254 | seek($output_fh, 0, 0); |
255 | while (<$output_fh>) { |
256 | chomp; |
257 | s/^(.*?)\t//; |
258 | if ($1 eq $name) { |
259 | s{(s\\_[0-9a-f]+)} { |
260 | exists($sym->{$1}) ? $sym->{$1} : $default; |
261 | }ge; |
262 | printf $fh $format, $_; |
263 | } |
264 | } |
265 | } |
266 | } |
267 | |
9426adcd |
268 | XSLoader::load 'B'; |
a798dbf2 |
269 | |
270 | 1; |
7f20e9dd |
271 | |
272 | __END__ |
273 | |
274 | =head1 NAME |
275 | |
276 | B - The Perl Compiler |
277 | |
278 | =head1 SYNOPSIS |
279 | |
280 | use B; |
281 | |
282 | =head1 DESCRIPTION |
283 | |
1a52ab62 |
284 | The C<B> module supplies classes which allow a Perl program to delve |
285 | into its own innards. It is the module used to implement the |
286 | "backends" of the Perl compiler. Usage of the compiler does not |
287 | require knowledge of this module: see the F<O> module for the |
288 | user-visible part. The C<B> module is of use to those who want to |
289 | write new compiler backends. This documentation assumes that the |
290 | reader knows a fair amount about perl's internals including such |
291 | things as SVs, OPs and the internal symbol table and syntax tree |
292 | of a program. |
293 | |
294 | =head1 OVERVIEW OF CLASSES |
295 | |
296 | The C structures used by Perl's internals to hold SV and OP |
297 | information (PVIV, AV, HV, ..., OP, SVOP, UNOP, ...) are modelled on a |
298 | class hierarchy and the C<B> module gives access to them via a true |
299 | object hierarchy. Structure fields which point to other objects |
300 | (whether types of SV or types of OP) are represented by the C<B> |
301 | module as Perl objects of the appropriate class. The bulk of the C<B> |
302 | module is the methods for accessing fields of these structures. Note |
303 | that all access is read-only: you cannot modify the internals by |
304 | using this module. |
305 | |
306 | =head2 SV-RELATED CLASSES |
307 | |
308 | B::IV, B::NV, B::RV, B::PV, B::PVIV, B::PVNV, B::PVMG, B::BM, B::PVLV, |
309 | B::AV, B::HV, B::CV, B::GV, B::FM, B::IO. These classes correspond in |
310 | the obvious way to the underlying C structures of similar names. The |
311 | inheritance hierarchy mimics the underlying C "inheritance". Access |
312 | methods correspond to the underlying C macros for field access, |
313 | usually with the leading "class indication" prefix removed (Sv, Av, |
314 | Hv, ...). The leading prefix is only left in cases where its removal |
315 | would cause a clash in method name. For example, C<GvREFCNT> stays |
316 | as-is since its abbreviation would clash with the "superclass" method |
317 | C<REFCNT> (corresponding to the C function C<SvREFCNT>). |
318 | |
319 | =head2 B::SV METHODS |
320 | |
321 | =over 4 |
322 | |
323 | =item REFCNT |
324 | |
325 | =item FLAGS |
326 | |
327 | =back |
328 | |
329 | =head2 B::IV METHODS |
330 | |
331 | =over 4 |
332 | |
333 | =item IV |
334 | |
335 | =item IVX |
336 | |
337 | =item needs64bits |
338 | |
339 | =item packiv |
340 | |
341 | =back |
342 | |
343 | =head2 B::NV METHODS |
344 | |
345 | =over 4 |
346 | |
347 | =item NV |
348 | |
349 | =item NVX |
350 | |
351 | =back |
352 | |
353 | =head2 B::RV METHODS |
354 | |
355 | =over 4 |
356 | |
357 | =item RV |
358 | |
359 | =back |
360 | |
361 | =head2 B::PV METHODS |
362 | |
363 | =over 4 |
364 | |
365 | =item PV |
366 | |
367 | =back |
368 | |
369 | =head2 B::PVMG METHODS |
370 | |
371 | =over 4 |
372 | |
373 | =item MAGIC |
374 | |
375 | =item SvSTASH |
376 | |
377 | =back |
378 | |
379 | =head2 B::MAGIC METHODS |
380 | |
381 | =over 4 |
382 | |
383 | =item MOREMAGIC |
384 | |
385 | =item PRIVATE |
386 | |
387 | =item TYPE |
388 | |
389 | =item FLAGS |
390 | |
391 | =item OBJ |
392 | |
393 | =item PTR |
394 | |
395 | =back |
396 | |
397 | =head2 B::PVLV METHODS |
398 | |
399 | =over 4 |
400 | |
401 | =item TARGOFF |
402 | |
403 | =item TARGLEN |
404 | |
405 | =item TYPE |
406 | |
407 | =item TARG |
408 | |
409 | =back |
410 | |
411 | =head2 B::BM METHODS |
412 | |
413 | =over 4 |
414 | |
415 | =item USEFUL |
416 | |
417 | =item PREVIOUS |
418 | |
419 | =item RARE |
420 | |
421 | =item TABLE |
422 | |
423 | =back |
424 | |
425 | =head2 B::GV METHODS |
426 | |
427 | =over 4 |
428 | |
87d7fd28 |
429 | =item is_empty |
430 | |
431 | This method returns TRUE if the GP field of the GV is NULL. |
432 | |
1a52ab62 |
433 | =item NAME |
434 | |
435 | =item STASH |
436 | |
437 | =item SV |
438 | |
439 | =item IO |
440 | |
441 | =item FORM |
442 | |
443 | =item AV |
444 | |
445 | =item HV |
446 | |
447 | =item EGV |
448 | |
449 | =item CV |
450 | |
451 | =item CVGEN |
452 | |
453 | =item LINE |
454 | |
b195d487 |
455 | =item FILE |
456 | |
1a52ab62 |
457 | =item FILEGV |
458 | |
459 | =item GvREFCNT |
460 | |
461 | =item FLAGS |
462 | |
463 | =back |
464 | |
465 | =head2 B::IO METHODS |
466 | |
467 | =over 4 |
468 | |
469 | =item LINES |
470 | |
471 | =item PAGE |
472 | |
473 | =item PAGE_LEN |
474 | |
475 | =item LINES_LEFT |
476 | |
477 | =item TOP_NAME |
478 | |
479 | =item TOP_GV |
480 | |
481 | =item FMT_NAME |
482 | |
483 | =item FMT_GV |
484 | |
485 | =item BOTTOM_NAME |
486 | |
487 | =item BOTTOM_GV |
488 | |
489 | =item SUBPROCESS |
490 | |
491 | =item IoTYPE |
492 | |
493 | =item IoFLAGS |
494 | |
495 | =back |
496 | |
497 | =head2 B::AV METHODS |
498 | |
499 | =over 4 |
500 | |
501 | =item FILL |
502 | |
503 | =item MAX |
504 | |
505 | =item OFF |
506 | |
507 | =item ARRAY |
508 | |
509 | =item AvFLAGS |
510 | |
511 | =back |
512 | |
513 | =head2 B::CV METHODS |
514 | |
515 | =over 4 |
516 | |
517 | =item STASH |
518 | |
519 | =item START |
520 | |
521 | =item ROOT |
522 | |
523 | =item GV |
524 | |
57843af0 |
525 | =item FILE |
526 | |
1a52ab62 |
527 | =item DEPTH |
528 | |
529 | =item PADLIST |
530 | |
531 | =item OUTSIDE |
532 | |
533 | =item XSUB |
534 | |
535 | =item XSUBANY |
536 | |
5cfd8ad4 |
537 | =item CvFLAGS |
538 | |
de3f1649 |
539 | =item const_sv |
540 | |
1a52ab62 |
541 | =back |
542 | |
543 | =head2 B::HV METHODS |
544 | |
545 | =over 4 |
546 | |
547 | =item FILL |
548 | |
549 | =item MAX |
550 | |
551 | =item KEYS |
552 | |
553 | =item RITER |
554 | |
555 | =item NAME |
556 | |
557 | =item PMROOT |
558 | |
559 | =item ARRAY |
560 | |
561 | =back |
562 | |
563 | =head2 OP-RELATED CLASSES |
564 | |
1a67a97c |
565 | B::OP, B::UNOP, B::BINOP, B::LOGOP, B::LISTOP, B::PMOP, |
7934575e |
566 | B::SVOP, B::PADOP, B::PVOP, B::CVOP, B::LOOP, B::COP. |
1a52ab62 |
567 | These classes correspond in |
568 | the obvious way to the underlying C structures of similar names. The |
569 | inheritance hierarchy mimics the underlying C "inheritance". Access |
570 | methods correspond to the underlying C structre field names, with the |
571 | leading "class indication" prefix removed (op_). |
572 | |
573 | =head2 B::OP METHODS |
574 | |
575 | =over 4 |
576 | |
577 | =item next |
578 | |
579 | =item sibling |
580 | |
3f872cb9 |
581 | =item name |
582 | |
583 | This returns the op name as a string (e.g. "add", "rv2av"). |
584 | |
1a52ab62 |
585 | =item ppaddr |
586 | |
dc333d64 |
587 | This returns the function name as a string (e.g. "PL_ppaddr[OP_ADD]", |
588 | "PL_ppaddr[OP_RV2AV]"). |
1a52ab62 |
589 | |
590 | =item desc |
591 | |
4369b173 |
592 | This returns the op description from the global C PL_op_desc array |
1a52ab62 |
593 | (e.g. "addition" "array deref"). |
594 | |
595 | =item targ |
596 | |
597 | =item type |
598 | |
599 | =item seq |
600 | |
601 | =item flags |
602 | |
603 | =item private |
604 | |
605 | =back |
606 | |
607 | =head2 B::UNOP METHOD |
608 | |
609 | =over 4 |
610 | |
611 | =item first |
612 | |
613 | =back |
614 | |
615 | =head2 B::BINOP METHOD |
616 | |
617 | =over 4 |
618 | |
619 | =item last |
620 | |
621 | =back |
622 | |
623 | =head2 B::LOGOP METHOD |
624 | |
625 | =over 4 |
626 | |
627 | =item other |
628 | |
629 | =back |
630 | |
1a52ab62 |
631 | =head2 B::LISTOP METHOD |
632 | |
633 | =over 4 |
634 | |
635 | =item children |
636 | |
637 | =back |
638 | |
639 | =head2 B::PMOP METHODS |
640 | |
641 | =over 4 |
642 | |
643 | =item pmreplroot |
644 | |
645 | =item pmreplstart |
646 | |
647 | =item pmnext |
648 | |
649 | =item pmregexp |
650 | |
651 | =item pmflags |
652 | |
653 | =item pmpermflags |
654 | |
655 | =item precomp |
656 | |
657 | =back |
658 | |
659 | =head2 B::SVOP METHOD |
660 | |
661 | =over 4 |
662 | |
663 | =item sv |
664 | |
065a1863 |
665 | =item gv |
666 | |
1a52ab62 |
667 | =back |
668 | |
7934575e |
669 | =head2 B::PADOP METHOD |
1a52ab62 |
670 | |
671 | =over 4 |
672 | |
7934575e |
673 | =item padix |
1a52ab62 |
674 | |
675 | =back |
676 | |
677 | =head2 B::PVOP METHOD |
678 | |
679 | =over 4 |
680 | |
681 | =item pv |
682 | |
683 | =back |
684 | |
685 | =head2 B::LOOP METHODS |
686 | |
687 | =over 4 |
688 | |
689 | =item redoop |
690 | |
691 | =item nextop |
692 | |
693 | =item lastop |
694 | |
695 | =back |
696 | |
697 | =head2 B::COP METHODS |
698 | |
699 | =over 4 |
700 | |
701 | =item label |
702 | |
703 | =item stash |
704 | |
57843af0 |
705 | =item file |
1a52ab62 |
706 | |
707 | =item cop_seq |
708 | |
709 | =item arybase |
710 | |
711 | =item line |
712 | |
713 | =back |
714 | |
715 | =head1 FUNCTIONS EXPORTED BY C<B> |
716 | |
717 | The C<B> module exports a variety of functions: some are simple |
718 | utility functions, others provide a Perl program with a way to |
719 | get an initial "handle" on an internal object. |
720 | |
721 | =over 4 |
722 | |
723 | =item main_cv |
724 | |
725 | Return the (faked) CV corresponding to the main part of the Perl |
726 | program. |
727 | |
31d7d75a |
728 | =item init_av |
729 | |
730 | Returns the AV object (i.e. in class B::AV) representing INIT blocks. |
731 | |
1a52ab62 |
732 | =item main_root |
733 | |
734 | Returns the root op (i.e. an object in the appropriate B::OP-derived |
735 | class) of the main part of the Perl program. |
736 | |
737 | =item main_start |
738 | |
739 | Returns the starting op of the main part of the Perl program. |
740 | |
741 | =item comppadlist |
742 | |
743 | Returns the AV object (i.e. in class B::AV) of the global comppadlist. |
744 | |
745 | =item sv_undef |
746 | |
747 | Returns the SV object corresponding to the C variable C<sv_undef>. |
748 | |
749 | =item sv_yes |
750 | |
751 | Returns the SV object corresponding to the C variable C<sv_yes>. |
752 | |
753 | =item sv_no |
754 | |
755 | Returns the SV object corresponding to the C variable C<sv_no>. |
756 | |
56eca212 |
757 | =item amagic_generation |
758 | |
759 | Returns the SV object corresponding to the C variable C<amagic_generation>. |
760 | |
1a52ab62 |
761 | =item walkoptree(OP, METHOD) |
762 | |
763 | Does a tree-walk of the syntax tree based at OP and calls METHOD on |
764 | each op it visits. Each node is visited before its children. If |
765 | C<walkoptree_debug> (q.v.) has been called to turn debugging on then |
766 | the method C<walkoptree_debug> is called on each op before METHOD is |
767 | called. |
768 | |
769 | =item walkoptree_debug(DEBUG) |
770 | |
771 | Returns the current debugging flag for C<walkoptree>. If the optional |
772 | DEBUG argument is non-zero, it sets the debugging flag to that. See |
773 | the description of C<walkoptree> above for what the debugging flag |
774 | does. |
775 | |
776 | =item walksymtable(SYMREF, METHOD, RECURSE) |
777 | |
778 | Walk the symbol table starting at SYMREF and call METHOD on each |
779 | symbol visited. When the walk reached package symbols "Foo::" it |
780 | invokes RECURSE and only recurses into the package if that sub |
781 | returns true. |
782 | |
783 | =item svref_2object(SV) |
784 | |
785 | Takes any Perl variable and turns it into an object in the |
786 | appropriate B::OP-derived or B::SV-derived class. Apart from functions |
787 | such as C<main_root>, this is the primary way to get an initial |
788 | "handle" on a internal perl data structure which can then be followed |
789 | with the other access methods. |
790 | |
791 | =item ppname(OPNUM) |
792 | |
793 | Return the PP function name (e.g. "pp_add") of op number OPNUM. |
794 | |
795 | =item hash(STR) |
796 | |
797 | Returns a string in the form "0x..." representing the value of the |
798 | internal hash function used by perl on string STR. |
799 | |
800 | =item cast_I32(I) |
801 | |
802 | Casts I to the internal I32 type used by that perl. |
803 | |
804 | |
805 | =item minus_c |
806 | |
807 | Does the equivalent of the C<-c> command-line option. Obviously, this |
808 | is only useful in a BEGIN block or else the flag is set too late. |
809 | |
810 | |
811 | =item cstring(STR) |
812 | |
813 | Returns a double-quote-surrounded escaped version of STR which can |
814 | be used as a string in C source code. |
815 | |
816 | =item class(OBJ) |
817 | |
818 | Returns the class of an object without the part of the classname |
819 | preceding the first "::". This is used to turn "B::UNOP" into |
820 | "UNOP" for example. |
821 | |
822 | =item threadsv_names |
823 | |
824 | In a perl compiled for threads, this returns a list of the special |
825 | per-thread threadsv variables. |
826 | |
1a52ab62 |
827 | =back |
7f20e9dd |
828 | |
829 | =head1 AUTHOR |
830 | |
831 | Malcolm Beattie, C<mbeattie@sable.ox.ac.uk> |
832 | |
833 | =cut |