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For walkoptree.pl
  Run on Fri Apr 17 10:24:39 2009
Reported on Fri Apr 17 10:25:15 2009

File C:/usr/lib/B.pm
Statements Executed 56
Total Time 0.09375 seconds
Subroutines — ordered by exclusive time
Calls P F Exclusive
Time		 Inclusive
Time		 Subroutine
0000s0sB::::BEGIN B::BEGIN
0000s0sB::GV::::SAFENAME B::GV::SAFENAME
0000s0sB::IV::::as_string B::IV::as_string
0000s0sB::IV::::int_value B::IV::int_value
0000s0sB::PV::::as_string B::PV::as_string
0000s0sB::Section::::addB::Section::add
0000s0sB::Section::::defaultB::Section::default
0000s0sB::Section::::getB::Section::get
0000s0sB::Section::::indexB::Section::index
0000s0sB::Section::::nameB::Section::name
0000s0sB::Section::::newB::Section::new
0000s0sB::Section::::outputB::Section::output
0000s0sB::Section::::symtableB::Section::symtable
0000s0sB::::class B::class
0000s0sB::::clearsym B::clearsym
0000s0sB::::compile_stats B::compile_stats
0000s0sB::::debug B::debug
2120s0sB::::main_root B::main_root(xsub)
0000s0sB::::objsym B::objsym
0000s0sB::::parents B::parents
0000s0sB::::peekop B::peekop
0000s0sB::::savesym B::savesym
0000s0sB::::timing_info B::timing_info
2120s0sB::::walkoptree B::walkoptree(xsub)
0000s0sB::::walkoptree_exec B::walkoptree_exec
0000s0sB::::walkoptree_slow B::walkoptree_slow
0000s0sB::::walksymtable B::walksymtable
LineStmts.Exclusive
Time		Avg.Code
1# B.pm
2#
3# Copyright (c) 1996, 1997, 1998 Malcolm Beattie
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#
8package B;
9
1010s0sour $VERSION = '1.19';
11
1230s0suse XSLoader ();
1310s0srequire Exporter;
1410s0s@ISA = qw(Exporter);
15
16# walkoptree_slow comes from B.pm (you are there),
17# walkoptree comes from B.xs
1810s0s@EXPORT_OK = qw(minus_c ppname save_BEGINs
19 class peekop cast_I32 cstring cchar hash threadsv_names
20 main_root main_start main_cv svref_2object opnumber
21 sub_generation amagic_generation perlstring
22 walkoptree_slow walkoptree walkoptree_exec walksymtable
23 parents comppadlist sv_undef compile_stats timing_info
24 begin_av init_av check_av end_av regex_padav dowarn defstash
25 curstash warnhook diehook inc_gv @optype @specialsv_name
26 );
2710s0spush @EXPORT_OK, qw(unitcheck_av) if $] > 5.009;
28
29sub OPf_KIDS ();
3030s0suse strict;
# spent 0s making 1 call to strict::import
3110s0s@B::SV::ISA = 'B::OBJECT';
3210s0s@B::NULL::ISA = 'B::SV';
3310s0s@B::PV::ISA = 'B::SV';
3410s0s@B::IV::ISA = 'B::SV';
3510s0s@B::NV::ISA = 'B::SV';
36# RV is eliminated with 5.11.0, but effectively is a specialisation of IV now.
3710s0s@B::RV::ISA = $] >= 5.011 ? 'B::IV' : 'B::SV';
3810s0s@B::PVIV::ISA = qw(B::PV B::IV);
3910s0s@B::PVNV::ISA = qw(B::PVIV B::NV);
4010s0s@B::PVMG::ISA = 'B::PVNV';
4110s0s@B::REGEXP::ISA = 'B::PVMG' if $] >= 5.011;
42# Change in the inheritance hierarchy post 5.9.0
4310s0s@B::PVLV::ISA = $] > 5.009 ? 'B::GV' : 'B::PVMG';
44# BM is eliminated post 5.9.5, but effectively is a specialisation of GV now.
4510s0s@B::BM::ISA = $] > 5.009005 ? 'B::GV' : 'B::PVMG';
4610s0s@B::AV::ISA = 'B::PVMG';
4710s0s@B::GV::ISA = 'B::PVMG';
4810s0s@B::HV::ISA = 'B::PVMG';
4910s0s@B::CV::ISA = 'B::PVMG';
5010s0s@B::IO::ISA = 'B::PVMG';
5110s0s@B::FM::ISA = 'B::CV';
52
5310s0s@B::OP::ISA = 'B::OBJECT';
5410s0s@B::UNOP::ISA = 'B::OP';
5510s0s@B::BINOP::ISA = 'B::UNOP';
5610s0s@B::LOGOP::ISA = 'B::UNOP';
5710s0s@B::LISTOP::ISA = 'B::BINOP';
5810s0s@B::SVOP::ISA = 'B::OP';
5910s0s@B::PADOP::ISA = 'B::OP';
6010s0s@B::PVOP::ISA = 'B::OP';
6110s0s@B::LOOP::ISA = 'B::LISTOP';
6210s0s@B::PMOP::ISA = 'B::LISTOP';
6310s0s@B::COP::ISA = 'B::OP';
64
6510s0s@B::SPECIAL::ISA = 'B::OBJECT';
66
6710s0s@B::optype = qw(OP UNOP BINOP LOGOP LISTOP PMOP SVOP PADOP PVOP LOOP COP);
68# bytecode.pl contained the following comment:
69# Nullsv *must* come first in the following so that the condition
70# ($$sv == 0) can continue to be used to test (sv == Nullsv).
7110s0s@B::specialsv_name = qw(Nullsv &PL_sv_undef &PL_sv_yes &PL_sv_no
72 (SV*)pWARN_ALL (SV*)pWARN_NONE (SV*)pWARN_STD);
73
74{
75 # Stop "-w" from complaining about the lack of a real B::OBJECT class
7610s0s package B::OBJECT;
77}
78
79sub B::GV::SAFENAME {
80 my $name = (shift())->NAME;
81
82 # The regex below corresponds to the isCONTROLVAR macro
83 # from toke.c
84
85 $name =~ s/^([\cA-\cZ\c\\c[\c]\c?\c_\c^])/"^".
86 chr( utf8::unicode_to_native( 64 ^ ord($1) ))/e;
87
88 # When we say unicode_to_native we really mean ascii_to_native,
89 # which matters iff this is a non-ASCII platform (EBCDIC).
90
91 return $name;
92}
93
94sub B::IV::int_value {
95 my ($self) = @_;
96 return (($self->FLAGS() & SVf_IVisUV()) ? $self->UVX : $self->IV);
97}
98
99sub B::NULL::as_string() {""}
100sub B::IV::as_string() {goto &B::IV::int_value}
101sub B::PV::as_string() {goto &B::PV::PV}
102
10310s0smy $debug;
10410s0smy $op_count = 0;
10510s0smy @parents = ();
106
107sub debug {
108 my ($class, $value) = @_;
109 $debug = $value;
110 walkoptree_debug($value);
111}
112
113sub class {
114 my $obj = shift;
115 my $name = ref $obj;
116 $name =~ s/^.*:://;
117 return $name;
118}
119
120sub parents { \@parents }
121
122# For debugging
123sub peekop {
124 my $op = shift;
125 return sprintf("%s (0x%x) %s", class($op), $$op, $op->name);
126}
127
128sub walkoptree_slow {
129 my($op, $method, $level) = @_;
130 $op_count++; # just for statistics
131 $level ||= 0;
132 warn(sprintf("walkoptree: %d. %s\n", $level, peekop($op))) if $debug;
133 $op->$method($level) if $op->can($method);
134 if ($$op && ($op->flags & OPf_KIDS)) {
135 my $kid;
136 unshift(@parents, $op);
137 for ($kid = $op->first; $$kid; $kid = $kid->sibling) {
138 walkoptree_slow($kid, $method, $level + 1);
139 }
140 shift @parents;
141 }
142 if (class($op) eq 'PMOP'
143 && ref($op->pmreplroot)
144 && ${$op->pmreplroot}
145 && $op->pmreplroot->isa( 'B::OP' ))
146 {
147 unshift(@parents, $op);
148 walkoptree_slow($op->pmreplroot, $method, $level + 1);
149 shift @parents;
150 }
151}
152
153sub compile_stats {
154 return "Total number of OPs processed: $op_count\n";
155}
156
157sub timing_info {
158 my ($sec, $min, $hr) = localtime;
159 my ($user, $sys) = times;
160 sprintf("%02d:%02d:%02d user=$user sys=$sys",
161 $hr, $min, $sec, $user, $sys);
162}
163
16410s0smy %symtable;
165
166sub clearsym {
167 %symtable = ();
168}
169
170sub savesym {
171 my ($obj, $value) = @_;
172# warn(sprintf("savesym: sym_%x => %s\n", $$obj, $value)); # debug
173 $symtable{sprintf("sym_%x", $$obj)} = $value;
174}
175
176sub objsym {
177 my $obj = shift;
178 return $symtable{sprintf("sym_%x", $$obj)};
179}
180
181sub walkoptree_exec {
182 my ($op, $method, $level) = @_;
183 $level ||= 0;
184 my ($sym, $ppname);
185 my $prefix = " " x $level;
186 for (; $$op; $op = $op->next) {
187 $sym = objsym($op);
188 if (defined($sym)) {
189 print $prefix, "goto $sym\n";
190 return;
191 }
192 savesym($op, sprintf("%s (0x%lx)", class($op), $$op));
193 $op->$method($level);
194 $ppname = $op->name;
195 if ($ppname =~
196 /^(d?or(assign)?|and(assign)?|mapwhile|grepwhile|entertry|range|cond_expr)$/)
197 {
198 print $prefix, uc($1), " => {\n";
199 walkoptree_exec($op->other, $method, $level + 1);
200 print $prefix, "}\n";
201 } elsif ($ppname eq "match" || $ppname eq "subst") {
202 my $pmreplstart = $op->pmreplstart;
203 if ($$pmreplstart) {
204 print $prefix, "PMREPLSTART => {\n";
205 walkoptree_exec($pmreplstart, $method, $level + 1);
206 print $prefix, "}\n";
207 }
208 } elsif ($ppname eq "substcont") {
209 print $prefix, "SUBSTCONT => {\n";
210 walkoptree_exec($op->other->pmreplstart, $method, $level + 1);
211 print $prefix, "}\n";
212 $op = $op->other;
213 } elsif ($ppname eq "enterloop") {
214 print $prefix, "REDO => {\n";
215 walkoptree_exec($op->redoop, $method, $level + 1);
216 print $prefix, "}\n", $prefix, "NEXT => {\n";
217 walkoptree_exec($op->nextop, $method, $level + 1);
218 print $prefix, "}\n", $prefix, "LAST => {\n";
219 walkoptree_exec($op->lastop, $method, $level + 1);
220 print $prefix, "}\n";
221 } elsif ($ppname eq "subst") {
222 my $replstart = $op->pmreplstart;
223 if ($$replstart) {
224 print $prefix, "SUBST => {\n";
225 walkoptree_exec($replstart, $method, $level + 1);
226 print $prefix, "}\n";
227 }
228 }
229 }
230}
231
232sub walksymtable {
233 my ($symref, $method, $recurse, $prefix) = @_;
234 my $sym;
235 my $ref;
236 my $fullname;
23730s0s no strict 'refs';
# spent 0s making 1 call to strict::unimport
238 $prefix = '' unless defined $prefix;
239 while (($sym, $ref) = each %$symref) {
240 $fullname = "*main::".$prefix.$sym;
241 if ($sym =~ /::$/) {
242 $sym = $prefix . $sym;
243 if ($sym ne "main::" && $sym ne "<none>::" && &$recurse($sym)) {
244 walksymtable(\%$fullname, $method, $recurse, $sym);
245 }
246 } else {
247 svref_2object(\*$fullname)->$method();
248 }
249 }
250}
251
252{
25310s0s package B::Section;
25420s0s my $output_fh;
255 my %sections;
256
257 sub new {
258 my ($class, $section, $symtable, $default) = @_;
259 $output_fh ||= FileHandle->new_tmpfile;
260 my $obj = bless [-1, $section, $symtable, $default], $class;
261 $sections{$section} = $obj;
262 return $obj;
263 }
264
265 sub get {
266 my ($class, $section) = @_;
267 return $sections{$section};
268 }
269
270 sub add {
271 my $section = shift;
272 while (defined($_ = shift)) {
273 print $output_fh "$section->[1]\t$_\n";
274 $section->[0]++;
275 }
276 }
277
278 sub index {
279 my $section = shift;
280 return $section->[0];
281 }
282
283 sub name {
284 my $section = shift;
285 return $section->[1];
286 }
287
288 sub symtable {
289 my $section = shift;
290 return $section->[2];
291 }
292
293 sub default {
294 my $section = shift;
295 return $section->[3];
296 }
297
298 sub output {
299 my ($section, $fh, $format) = @_;
300 my $name = $section->name;
301 my $sym = $section->symtable || {};
302 my $default = $section->default;
303
304 seek($output_fh, 0, 0);
305 while (<$output_fh>) {
306 chomp;
307 s/^(.*?)\t//;
308 if ($1 eq $name) {
309 s{(s\\_[0-9a-f]+)} {
310 exists($sym->{$1}) ? $sym->{$1} : $default;
311 }ge;
312 printf $fh $format, $_;
313 }
314 }
315 }
316}
317
318193.8ms93.8msXSLoader::load 'B';
# spent 93.8ms making 1 call to XSLoader::load
319
32010s0s1;
321
322__END__
323
324=head1 NAME
325
326B - The Perl Compiler
327
328=head1 SYNOPSIS
329
330 use B;
331
332=head1 DESCRIPTION
333
334The C<B> module supplies classes which allow a Perl program to delve
335into its own innards. It is the module used to implement the
336"backends" of the Perl compiler. Usage of the compiler does not
337require knowledge of this module: see the F<O> module for the
338user-visible part. The C<B> module is of use to those who want to
339write new compiler backends. This documentation assumes that the
340reader knows a fair amount about perl's internals including such
341things as SVs, OPs and the internal symbol table and syntax tree
342of a program.
343
344=head1 OVERVIEW
345
346The C<B> module contains a set of utility functions for querying the
347current state of the Perl interpreter; typically these functions
348return objects from the B::SV and B::OP classes, or their derived
349classes. These classes in turn define methods for querying the
350resulting objects about their own internal state.
351
352=head1 Utility Functions
353
354The C<B> module exports a variety of functions: some are simple
355utility functions, others provide a Perl program with a way to
356get an initial "handle" on an internal object.
357
358=head2 Functions Returning C<B::SV>, C<B::AV>, C<B::HV>, and C<B::CV> objects
359
360For descriptions of the class hierarchy of these objects and the
361methods that can be called on them, see below, L<"OVERVIEW OF
362CLASSES"> and L<"SV-RELATED CLASSES">.
363
364=over 4
365
366=item sv_undef
367
368Returns the SV object corresponding to the C variable C<sv_undef>.
369
370=item sv_yes
371
372Returns the SV object corresponding to the C variable C<sv_yes>.
373
374=item sv_no
375
376Returns the SV object corresponding to the C variable C<sv_no>.
377
378=item svref_2object(SVREF)
379
380Takes a reference to any Perl value, and turns the referred-to value
381into an object in the appropriate B::OP-derived or B::SV-derived
382class. Apart from functions such as C<main_root>, this is the primary
383way to get an initial "handle" on an internal perl data structure
384which can then be followed with the other access methods.
385
386The returned object will only be valid as long as the underlying OPs
387and SVs continue to exist. Do not attempt to use the object after the
388underlying structures are freed.
389
390=item amagic_generation
391
392Returns the SV object corresponding to the C variable C<amagic_generation>.
393
394=item init_av
395
396Returns the AV object (i.e. in class B::AV) representing INIT blocks.
397
398=item check_av
399
400Returns the AV object (i.e. in class B::AV) representing CHECK blocks.
401
402=item unitcheck_av
403
404Returns the AV object (i.e. in class B::AV) representing UNITCHECK blocks.
405
406=item begin_av
407
408Returns the AV object (i.e. in class B::AV) representing BEGIN blocks.
409
410=item end_av
411
412Returns the AV object (i.e. in class B::AV) representing END blocks.
413
414=item comppadlist
415
416Returns the AV object (i.e. in class B::AV) of the global comppadlist.
417
418=item regex_padav
419
420Only when perl was compiled with ithreads.
421
422=item main_cv
423
424Return the (faked) CV corresponding to the main part of the Perl
425program.
426
427=back
428
429=head2 Functions for Examining the Symbol Table
430
431=over 4
432
433=item walksymtable(SYMREF, METHOD, RECURSE, PREFIX)
434
435Walk the symbol table starting at SYMREF and call METHOD on each
436symbol (a B::GV object) visited. When the walk reaches package
437symbols (such as "Foo::") it invokes RECURSE, passing in the symbol
438name, and only recurses into the package if that sub returns true.
439
440PREFIX is the name of the SYMREF you're walking.
441
442For example:
443
444 # Walk CGI's symbol table calling print_subs on each symbol.
445 # Recurse only into CGI::Util::
446 walksymtable(\%CGI::, 'print_subs', sub { $_[0] eq 'CGI::Util::' },
447 'CGI::');
448
449print_subs() is a B::GV method you have declared. Also see L<"B::GV
450Methods">, below.
451
452=back
453
454=head2 Functions Returning C<B::OP> objects or for walking op trees
455
456For descriptions of the class hierarchy of these objects and the
457methods that can be called on them, see below, L<"OVERVIEW OF
458CLASSES"> and L<"OP-RELATED CLASSES">.
459
460=over 4
461
462=item main_root
463
464Returns the root op (i.e. an object in the appropriate B::OP-derived
465class) of the main part of the Perl program.
466
467=item main_start
468
469Returns the starting op of the main part of the Perl program.
470
471=item walkoptree(OP, METHOD)
472
473Does a tree-walk of the syntax tree based at OP and calls METHOD on
474each op it visits. Each node is visited before its children. If
475C<walkoptree_debug> (see below) has been called to turn debugging on then
476the method C<walkoptree_debug> is called on each op before METHOD is
477called.
478
479=item walkoptree_debug(DEBUG)
480
481Returns the current debugging flag for C<walkoptree>. If the optional
482DEBUG argument is non-zero, it sets the debugging flag to that. See
483the description of C<walkoptree> above for what the debugging flag
484does.
485
486=back
487
488=head2 Miscellaneous Utility Functions
489
490=over 4
491
492=item ppname(OPNUM)
493
494Return the PP function name (e.g. "pp_add") of op number OPNUM.
495
496=item hash(STR)
497
498Returns a string in the form "0x..." representing the value of the
499internal hash function used by perl on string STR.
500
501=item cast_I32(I)
502
503Casts I to the internal I32 type used by that perl.
504
505=item minus_c
506
507Does the equivalent of the C<-c> command-line option. Obviously, this
508is only useful in a BEGIN block or else the flag is set too late.
509
510=item cstring(STR)
511
512Returns a double-quote-surrounded escaped version of STR which can
513be used as a string in C source code.
514
515=item perlstring(STR)
516
517Returns a double-quote-surrounded escaped version of STR which can
518be used as a string in Perl source code.
519
520=item class(OBJ)
521
522Returns the class of an object without the part of the classname
523preceding the first C<"::">. This is used to turn C<"B::UNOP"> into
524C<"UNOP"> for example.
525
526=item threadsv_names
527
528In a perl compiled for threads, this returns a list of the special
529per-thread threadsv variables.
530
531=back
532
533=head2 Exported utility variabiles
534
535=over 4
536
537=item @optype
538
539 my $op_type = $optype[$op_type_num];
540
541A simple mapping of the op type number to its type (like 'COP' or 'BINOP').
542
543=item @specialsv_name
544
545 my $sv_name = $specialsv_name[$sv_index];
546
547Certain SV types are considered 'special'. They're represented by
548B::SPECIAL and are referred to by a number from the specialsv_list.
549This array maps that number back to the name of the SV (like 'Nullsv'
550or '&PL_sv_undef').
551
552=back
553
554
555=head1 OVERVIEW OF CLASSES
556
557The C structures used by Perl's internals to hold SV and OP
558information (PVIV, AV, HV, ..., OP, SVOP, UNOP, ...) are modelled on a
559class hierarchy and the C<B> module gives access to them via a true
560object hierarchy. Structure fields which point to other objects
561(whether types of SV or types of OP) are represented by the C<B>
562module as Perl objects of the appropriate class.
563
564The bulk of the C<B> module is the methods for accessing fields of
565these structures.
566
567Note that all access is read-only. You cannot modify the internals by
568using this module. Also, note that the B::OP and B::SV objects created
569by this module are only valid for as long as the underlying objects
570exist; their creation doesn't increase the reference counts of the
571underlying objects. Trying to access the fields of a freed object will
572give incomprehensible results, or worse.
573
574=head2 SV-RELATED CLASSES
575
576B::IV, B::NV, B::RV, B::PV, B::PVIV, B::PVNV, B::PVMG, B::BM (5.9.5 and
577earlier), B::PVLV, B::AV, B::HV, B::CV, B::GV, B::FM, B::IO. These classes
578correspond in the obvious way to the underlying C structures of similar names.
579The inheritance hierarchy mimics the underlying C "inheritance". For the
5805.10.x branch, (I<ie> 5.10.0, 5.10.1 I<etc>) this is:
581
582 B::SV
583 |
584 +------------+------------+------------+
585 | | | |
586 B::PV B::IV B::NV B::RV
587 \ / /
588 \ / /
589 B::PVIV /
590 \ /
591 \ /
592 \ /
593 B::PVNV
594 |
595 |
596 B::PVMG
597 |
598 +-----+-----+-----+-----+
599 | | | | |
600 B::AV B::GV B::HV B::CV B::IO
601 | |
602 | |
603 B::PVLV B::FM
604
605For 5.9.0 and earlier, PVLV is a direct subclass of PVMG, and BM is still
606present as a distinct type, so the base of this diagram is
607
608
609 |
610 |
611 B::PVMG
612 |
613 +------+-----+-----+-----+-----+-----+
614 | | | | | | |
615 B::PVLV B::BM B::AV B::GV B::HV B::CV B::IO
616 |
617 |
618 B::FM
619
620For 5.11.0 and later, B::RV is abolished, and IVs can be used to store
621references, and a new type B::REGEXP is introduced, giving this structure:
622
623 B::SV
624 |
625 +------------+------------+
626 | | |
627 B::PV B::IV B::NV
628 \ / /
629 \ / /
630 B::PVIV /
631 \ /
632 \ /
633 \ /
634 B::PVNV
635 |
636 |
637 B::PVMG
638 |
639 +-------+-------+---+---+-------+-------+
640 | | | | | |
641 B::AV B::GV B::HV B::CV B::IO B::REGEXP
642 | |
643 | |
644 B::PVLV B::FM
645
646
647Access methods correspond to the underlying C macros for field access,
648usually with the leading "class indication" prefix removed (Sv, Av,
649Hv, ...). The leading prefix is only left in cases where its removal
650would cause a clash in method name. For example, C<GvREFCNT> stays
651as-is since its abbreviation would clash with the "superclass" method
652C<REFCNT> (corresponding to the C function C<SvREFCNT>).
653
654=head2 B::SV Methods
655
656=over 4
657
658=item REFCNT
659
660=item FLAGS
661
662=item object_2svref
663
664Returns a reference to the regular scalar corresponding to this
665B::SV object. In other words, this method is the inverse operation
666to the svref_2object() subroutine. This scalar and other data it points
667at should be considered read-only: modifying them is neither safe nor
668guaranteed to have a sensible effect.
669
670=back
671
672=head2 B::IV Methods
673
674=over 4
675
676=item IV
677
678Returns the value of the IV, I<interpreted as
679a signed integer>. This will be misleading
680if C<FLAGS & SVf_IVisUV>. Perhaps you want the
681C<int_value> method instead?
682
683=item IVX
684
685=item UVX
686
687=item int_value
688
689This method returns the value of the IV as an integer.
690It differs from C<IV> in that it returns the correct
691value regardless of whether it's stored signed or
692unsigned.
693
694=item needs64bits
695
696=item packiv
697
698=back
699
700=head2 B::NV Methods
701
702=over 4
703
704=item NV
705
706=item NVX
707
708=back
709
710=head2 B::RV Methods
711
712=over 4
713
714=item RV
715
716=back
717
718=head2 B::PV Methods
719
720=over 4
721
722=item PV
723
724This method is the one you usually want. It constructs a
725string using the length and offset information in the struct:
726for ordinary scalars it will return the string that you'd see
727from Perl, even if it contains null characters.
728
729=item RV
730
731Same as B::RV::RV, except that it will die() if the PV isn't
732a reference.
733
734=item PVX
735
736This method is less often useful. It assumes that the string
737stored in the struct is null-terminated, and disregards the
738length information.
739
740It is the appropriate method to use if you need to get the name
741of a lexical variable from a padname array. Lexical variable names
742are always stored with a null terminator, and the length field
743(SvCUR) is overloaded for other purposes and can't be relied on here.
744
745=back
746
747=head2 B::PVMG Methods
748
749=over 4
750
751=item MAGIC
752
753=item SvSTASH
754
755=back
756
757=head2 B::MAGIC Methods
758
759=over 4
760
761=item MOREMAGIC
762
763=item precomp
764
765Only valid on r-magic, returns the string that generated the regexp.
766
767=item PRIVATE
768
769=item TYPE
770
771=item FLAGS
772
773=item OBJ
774
775Will die() if called on r-magic.
776
777=item PTR
778
779=item REGEX
780
781Only valid on r-magic, returns the integer value of the REGEX stored
782in the MAGIC.
783
784=back
785
786=head2 B::PVLV Methods
787
788=over 4
789
790=item TARGOFF
791
792=item TARGLEN
793
794=item TYPE
795
796=item TARG
797
798=back
799
800=head2 B::BM Methods
801
802=over 4
803
804=item USEFUL
805
806=item PREVIOUS
807
808=item RARE
809
810=item TABLE
811
812=back
813
814=head2 B::GV Methods
815
816=over 4
817
818=item is_empty
819
820This method returns TRUE if the GP field of the GV is NULL.
821
822=item NAME
823
824=item SAFENAME
825
826This method returns the name of the glob, but if the first
827character of the name is a control character, then it converts
828it to ^X first, so that *^G would return "^G" rather than "\cG".
829
830It's useful if you want to print out the name of a variable.
831If you restrict yourself to globs which exist at compile-time
832then the result ought to be unambiguous, because code like
833C<${"^G"} = 1> is compiled as two ops - a constant string and
834a dereference (rv2gv) - so that the glob is created at runtime.
835
836If you're working with globs at runtime, and need to disambiguate
837*^G from *{"^G"}, then you should use the raw NAME method.
838
839=item STASH
840
841=item SV
842
843=item IO
844
845=item FORM
846
847=item AV
848
849=item HV
850
851=item EGV
852
853=item CV
854
855=item CVGEN
856
857=item LINE
858
859=item FILE
860
861=item FILEGV
862
863=item GvREFCNT
864
865=item FLAGS
866
867=back
868
869=head2 B::IO Methods
870
871=over 4
872
873=item LINES
874
875=item PAGE
876
877=item PAGE_LEN
878
879=item LINES_LEFT
880
881=item TOP_NAME
882
883=item TOP_GV
884
885=item FMT_NAME
886
887=item FMT_GV
888
889=item BOTTOM_NAME
890
891=item BOTTOM_GV
892
893=item SUBPROCESS
894
895=item IoTYPE
896
897=item IoFLAGS
898
899=item IsSTD
900
901Takes one arguments ( 'stdin' | 'stdout' | 'stderr' ) and returns true
902if the IoIFP of the object is equal to the handle whose name was
903passed as argument ( i.e. $io->IsSTD('stderr') is true if
904IoIFP($io) == PerlIO_stdin() ).
905
906=back
907
908=head2 B::AV Methods
909
910=over 4
911
912=item FILL
913
914=item MAX
915
916=item OFF
917
918=item ARRAY
919
920=item ARRAYelt
921
922Like C<ARRAY>, but takes an index as an argument to get only one element,
923rather than a list of all of them.
924
925=item OFF
926
927This method is deprecated if running under Perl 5.8, and is no longer present
928if running under Perl 5.9
929
930=item AvFLAGS
931
932This method returns the AV specific flags. In Perl 5.9 these are now stored
933in with the main SV flags, so this method is no longer present.
934
935=back
936
937=head2 B::CV Methods
938
939=over 4
940
941=item STASH
942
943=item START
944
945=item ROOT
946
947=item GV
948
949=item FILE
950
951=item DEPTH
952
953=item PADLIST
954
955=item OUTSIDE
956
957=item OUTSIDE_SEQ
958
959=item XSUB
960
961=item XSUBANY
962
963For constant subroutines, returns the constant SV returned by the subroutine.
964
965=item CvFLAGS
966
967=item const_sv
968
969=back
970
971=head2 B::HV Methods
972
973=over 4
974
975=item FILL
976
977=item MAX
978
979=item KEYS
980
981=item RITER
982
983=item NAME
984
985=item PMROOT
986
987=item ARRAY
988
989=item PMROOT
990
991This method is not present if running under Perl 5.9, as the PMROOT
992information is no longer stored directly in the hash.
993
994=back
995
996=head2 OP-RELATED CLASSES
997
998C<B::OP>, C<B::UNOP>, C<B::BINOP>, C<B::LOGOP>, C<B::LISTOP>, C<B::PMOP>,
999C<B::SVOP>, C<B::PADOP>, C<B::PVOP>, C<B::LOOP>, C<B::COP>.
1000
1001These classes correspond in the obvious way to the underlying C
1002structures of similar names. The inheritance hierarchy mimics the
1003underlying C "inheritance":
1004
1005 B::OP
1006 |
1007 +---------------+--------+--------+-------+
1008 | | | | |
1009 B::UNOP B::SVOP B::PADOP B::COP B::PVOP
1010 ,' `-.
1011 / `--.
1012 B::BINOP B::LOGOP
1013 |
1014 |
1015 B::LISTOP
1016 ,' `.
1017 / \
1018 B::LOOP B::PMOP
1019
1020Access methods correspond to the underlying C structre field names,
1021with the leading "class indication" prefix (C<"op_">) removed.
1022
1023=head2 B::OP Methods
1024
1025These methods get the values of similarly named fields within the OP
1026data structure. See top of C<op.h> for more info.
1027
1028=over 4
1029
1030=item next
1031
1032=item sibling
1033
1034=item name
1035
1036This returns the op name as a string (e.g. "add", "rv2av").
1037
1038=item ppaddr
1039
1040This returns the function name as a string (e.g. "PL_ppaddr[OP_ADD]",
1041"PL_ppaddr[OP_RV2AV]").
1042
1043=item desc
1044
1045This returns the op description from the global C PL_op_desc array
1046(e.g. "addition" "array deref").
1047
1048=item targ
1049
1050=item type
1051
1052=item opt
1053
1054=item flags
1055
1056=item private
1057
1058=item spare
1059
1060=back
1061
1062=head2 B::UNOP METHOD
1063
1064=over 4
1065
1066=item first
1067
1068=back
1069
1070=head2 B::BINOP METHOD
1071
1072=over 4
1073
1074=item last
1075
1076=back
1077
1078=head2 B::LOGOP METHOD
1079
1080=over 4
1081
1082=item other
1083
1084=back
1085
1086=head2 B::LISTOP METHOD
1087
1088=over 4
1089
1090=item children
1091
1092=back
1093
1094=head2 B::PMOP Methods
1095
1096=over 4
1097
1098=item pmreplroot
1099
1100=item pmreplstart
1101
1102=item pmnext
1103
1104=item pmregexp
1105
1106=item pmflags
1107
1108=item extflags
1109
1110=item precomp
1111
1112=item pmoffset
1113
1114Only when perl was compiled with ithreads.
1115
1116=back
1117
1118=head2 B::SVOP METHOD
1119
1120=over 4
1121
1122=item sv
1123
1124=item gv
1125
1126=back
1127
1128=head2 B::PADOP METHOD
1129
1130=over 4
1131
1132=item padix
1133
1134=back
1135
1136=head2 B::PVOP METHOD
1137
1138=over 4
1139
1140=item pv
1141
1142=back
1143
1144=head2 B::LOOP Methods
1145
1146=over 4
1147
1148=item redoop
1149
1150=item nextop
1151
1152=item lastop
1153
1154=back
1155
1156=head2 B::COP Methods
1157
1158=over 4
1159
1160=item label
1161
1162=item stash
1163
1164=item stashpv
1165
1166=item file
1167
1168=item cop_seq
1169
1170=item arybase
1171
1172=item line
1173
1174=item warnings
1175
1176=item io
1177
1178=item hints
1179
1180=item hints_hash
1181
1182=back
1183
1184
1185=head1 AUTHOR
1186
1187Malcolm Beattie, C<mbeattie@sable.ox.ac.uk>
1188
1189=cut
# spent 0s within B::main_root which was called # once (0s+0s) at line 10 of C:/Dokumente und Einstellungen/Entwicklung/Eigene Dateien/Perl/community/walkoptree.pl
sub B::main_root; # xsub
# spent 0s within B::walkoptree which was called # once (0s+0s) at line 10 of C:/Dokumente und Einstellungen/Entwicklung/Eigene Dateien/Perl/community/walkoptree.pl
sub B::walkoptree; # xsub
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