diff options
Diffstat (limited to 'Master/tlpkg/tlperl/lib/B.pm')
| -rwxr-xr-x | Master/tlpkg/tlperl/lib/B.pm | 1189 |
1 files changed, 1189 insertions, 0 deletions
diff --git a/Master/tlpkg/tlperl/lib/B.pm b/Master/tlpkg/tlperl/lib/B.pm new file mode 100755 index 00000000000..52ae05e3269 --- /dev/null +++ b/Master/tlpkg/tlperl/lib/B.pm @@ -0,0 +1,1189 @@ +# B.pm +# +# Copyright (c) 1996, 1997, 1998 Malcolm Beattie +# +# You may distribute under the terms of either the GNU General Public +# License or the Artistic License, as specified in the README file. +# +package B; + +our $VERSION = '1.22'; + +use XSLoader (); +require Exporter; +@ISA = qw(Exporter); + +# walkoptree_slow comes from B.pm (you are there), +# walkoptree comes from B.xs +@EXPORT_OK = qw(minus_c ppname save_BEGINs + class peekop cast_I32 cstring cchar hash threadsv_names + main_root main_start main_cv svref_2object opnumber + sub_generation amagic_generation perlstring + walkoptree_slow walkoptree walkoptree_exec walksymtable + parents comppadlist sv_undef compile_stats timing_info + begin_av init_av check_av end_av regex_padav dowarn defstash + curstash warnhook diehook inc_gv @optype @specialsv_name + ); +push @EXPORT_OK, qw(unitcheck_av) if $] > 5.009; + +sub OPf_KIDS (); +use strict; +@B::SV::ISA = 'B::OBJECT'; +@B::NULL::ISA = 'B::SV'; +@B::PV::ISA = 'B::SV'; +@B::IV::ISA = 'B::SV'; +@B::NV::ISA = 'B::SV'; +# RV is eliminated with 5.11.0, but effectively is a specialisation of IV now. +@B::RV::ISA = $] >= 5.011 ? 'B::IV' : 'B::SV'; +@B::PVIV::ISA = qw(B::PV B::IV); +@B::PVNV::ISA = qw(B::PVIV B::NV); +@B::PVMG::ISA = 'B::PVNV'; +@B::REGEXP::ISA = 'B::PVMG' if $] >= 5.011; +# Change in the inheritance hierarchy post 5.9.0 +@B::PVLV::ISA = $] > 5.009 ? 'B::GV' : 'B::PVMG'; +# BM is eliminated post 5.9.5, but effectively is a specialisation of GV now. +@B::BM::ISA = $] > 5.009005 ? 'B::GV' : 'B::PVMG'; +@B::AV::ISA = 'B::PVMG'; +@B::GV::ISA = 'B::PVMG'; +@B::HV::ISA = 'B::PVMG'; +@B::CV::ISA = 'B::PVMG'; +@B::IO::ISA = 'B::PVMG'; +@B::FM::ISA = 'B::CV'; + +@B::OP::ISA = 'B::OBJECT'; +@B::UNOP::ISA = 'B::OP'; +@B::BINOP::ISA = 'B::UNOP'; +@B::LOGOP::ISA = 'B::UNOP'; +@B::LISTOP::ISA = 'B::BINOP'; +@B::SVOP::ISA = 'B::OP'; +@B::PADOP::ISA = 'B::OP'; +@B::PVOP::ISA = 'B::OP'; +@B::LOOP::ISA = 'B::LISTOP'; +@B::PMOP::ISA = 'B::LISTOP'; +@B::COP::ISA = 'B::OP'; + +@B::SPECIAL::ISA = 'B::OBJECT'; + +@B::optype = qw(OP UNOP BINOP LOGOP LISTOP PMOP SVOP PADOP PVOP LOOP COP); +# bytecode.pl contained the following comment: +# Nullsv *must* come first in the following so that the condition +# ($$sv == 0) can continue to be used to test (sv == Nullsv). +@B::specialsv_name = qw(Nullsv &PL_sv_undef &PL_sv_yes &PL_sv_no + (SV*)pWARN_ALL (SV*)pWARN_NONE (SV*)pWARN_STD); + +{ + # Stop "-w" from complaining about the lack of a real B::OBJECT class + package B::OBJECT; +} + +sub B::GV::SAFENAME { + my $name = (shift())->NAME; + + # The regex below corresponds to the isCONTROLVAR macro + # from toke.c + + $name =~ s/^([\cA-\cZ\c\\c[\c]\c?\c_\c^])/"^". + chr( utf8::unicode_to_native( 64 ^ ord($1) ))/e; + + # When we say unicode_to_native we really mean ascii_to_native, + # which matters iff this is a non-ASCII platform (EBCDIC). + + return $name; +} + +sub B::IV::int_value { + my ($self) = @_; + return (($self->FLAGS() & SVf_IVisUV()) ? $self->UVX : $self->IV); +} + +sub B::NULL::as_string() {""} +sub B::IV::as_string() {goto &B::IV::int_value} +sub B::PV::as_string() {goto &B::PV::PV} + +my $debug; +my $op_count = 0; +my @parents = (); + +sub debug { + my ($class, $value) = @_; + $debug = $value; + walkoptree_debug($value); +} + +sub class { + my $obj = shift; + my $name = ref $obj; + $name =~ s/^.*:://; + return $name; +} + +sub parents { \@parents } + +# For debugging +sub peekop { + my $op = shift; + return sprintf("%s (0x%x) %s", class($op), $$op, $op->name); +} + +sub walkoptree_slow { + my($op, $method, $level) = @_; + $op_count++; # just for statistics + $level ||= 0; + warn(sprintf("walkoptree: %d. %s\n", $level, peekop($op))) if $debug; + $op->$method($level) if $op->can($method); + if ($$op && ($op->flags & OPf_KIDS)) { + my $kid; + unshift(@parents, $op); + for ($kid = $op->first; $$kid; $kid = $kid->sibling) { + walkoptree_slow($kid, $method, $level + 1); + } + shift @parents; + } + if (class($op) eq 'PMOP' + && ref($op->pmreplroot) + && ${$op->pmreplroot} + && $op->pmreplroot->isa( 'B::OP' )) + { + unshift(@parents, $op); + walkoptree_slow($op->pmreplroot, $method, $level + 1); + shift @parents; + } +} + +sub compile_stats { + return "Total number of OPs processed: $op_count\n"; +} + +sub timing_info { + my ($sec, $min, $hr) = localtime; + my ($user, $sys) = times; + sprintf("%02d:%02d:%02d user=$user sys=$sys", + $hr, $min, $sec, $user, $sys); +} + +my %symtable; + +sub clearsym { + %symtable = (); +} + +sub savesym { + my ($obj, $value) = @_; +# warn(sprintf("savesym: sym_%x => %s\n", $$obj, $value)); # debug + $symtable{sprintf("sym_%x", $$obj)} = $value; +} + +sub objsym { + my $obj = shift; + return $symtable{sprintf("sym_%x", $$obj)}; +} + +sub walkoptree_exec { + my ($op, $method, $level) = @_; + $level ||= 0; + my ($sym, $ppname); + my $prefix = " " x $level; + for (; $$op; $op = $op->next) { + $sym = objsym($op); + if (defined($sym)) { + print $prefix, "goto $sym\n"; + return; + } + savesym($op, sprintf("%s (0x%lx)", class($op), $$op)); + $op->$method($level); + $ppname = $op->name; + if ($ppname =~ + /^(d?or(assign)?|and(assign)?|mapwhile|grepwhile|entertry|range|cond_expr)$/) + { + print $prefix, uc($1), " => {\n"; + walkoptree_exec($op->other, $method, $level + 1); + print $prefix, "}\n"; + } elsif ($ppname eq "match" || $ppname eq "subst") { + my $pmreplstart = $op->pmreplstart; + if ($$pmreplstart) { + print $prefix, "PMREPLSTART => {\n"; + walkoptree_exec($pmreplstart, $method, $level + 1); + print $prefix, "}\n"; + } + } elsif ($ppname eq "substcont") { + print $prefix, "SUBSTCONT => {\n"; + walkoptree_exec($op->other->pmreplstart, $method, $level + 1); + print $prefix, "}\n"; + $op = $op->other; + } elsif ($ppname eq "enterloop") { + print $prefix, "REDO => {\n"; + walkoptree_exec($op->redoop, $method, $level + 1); + print $prefix, "}\n", $prefix, "NEXT => {\n"; + walkoptree_exec($op->nextop, $method, $level + 1); + print $prefix, "}\n", $prefix, "LAST => {\n"; + walkoptree_exec($op->lastop, $method, $level + 1); + print $prefix, "}\n"; + } elsif ($ppname eq "subst") { + my $replstart = $op->pmreplstart; + if ($$replstart) { + print $prefix, "SUBST => {\n"; + walkoptree_exec($replstart, $method, $level + 1); + print $prefix, "}\n"; + } + } + } +} + +sub walksymtable { + my ($symref, $method, $recurse, $prefix) = @_; + my $sym; + my $ref; + my $fullname; + no strict 'refs'; + $prefix = '' unless defined $prefix; + while (($sym, $ref) = each %$symref) { + $fullname = "*main::".$prefix.$sym; + if ($sym =~ /::$/) { + $sym = $prefix . $sym; + if (svref_2object(\*$sym)->NAME ne "main::" && $sym ne "<none>::" && &$recurse($sym)) { + walksymtable(\%$fullname, $method, $recurse, $sym); + } + } else { + svref_2object(\*$fullname)->$method(); + } + } +} + +{ + package B::Section; + my $output_fh; + my %sections; + + sub new { + my ($class, $section, $symtable, $default) = @_; + $output_fh ||= FileHandle->new_tmpfile; + my $obj = bless [-1, $section, $symtable, $default], $class; + $sections{$section} = $obj; + return $obj; + } + + sub get { + my ($class, $section) = @_; + return $sections{$section}; + } + + sub add { + my $section = shift; + while (defined($_ = shift)) { + print $output_fh "$section->[1]\t$_\n"; + $section->[0]++; + } + } + + sub index { + my $section = shift; + return $section->[0]; + } + + sub name { + my $section = shift; + return $section->[1]; + } + + sub symtable { + my $section = shift; + return $section->[2]; + } + + sub default { + my $section = shift; + return $section->[3]; + } + + sub output { + my ($section, $fh, $format) = @_; + my $name = $section->name; + my $sym = $section->symtable || {}; + my $default = $section->default; + + seek($output_fh, 0, 0); + while (<$output_fh>) { + chomp; + s/^(.*?)\t//; + if ($1 eq $name) { + s{(s\\_[0-9a-f]+)} { + exists($sym->{$1}) ? $sym->{$1} : $default; + }ge; + printf $fh $format, $_; + } + } + } +} + +XSLoader::load 'B'; + +1; + +__END__ + +=head1 NAME + +B - The Perl Compiler + +=head1 SYNOPSIS + + use B; + +=head1 DESCRIPTION + +The C<B> module supplies classes which allow a Perl program to delve +into its own innards. It is the module used to implement the +"backends" of the Perl compiler. Usage of the compiler does not +require knowledge of this module: see the F<O> module for the +user-visible part. The C<B> module is of use to those who want to +write new compiler backends. This documentation assumes that the +reader knows a fair amount about perl's internals including such +things as SVs, OPs and the internal symbol table and syntax tree +of a program. + +=head1 OVERVIEW + +The C<B> module contains a set of utility functions for querying the +current state of the Perl interpreter; typically these functions +return objects from the B::SV and B::OP classes, or their derived +classes. These classes in turn define methods for querying the +resulting objects about their own internal state. + +=head1 Utility Functions + +The C<B> module exports a variety of functions: some are simple +utility functions, others provide a Perl program with a way to +get an initial "handle" on an internal object. + +=head2 Functions Returning C<B::SV>, C<B::AV>, C<B::HV>, and C<B::CV> objects + +For descriptions of the class hierarchy of these objects and the +methods that can be called on them, see below, L<"OVERVIEW OF +CLASSES"> and L<"SV-RELATED CLASSES">. + +=over 4 + +=item sv_undef + +Returns the SV object corresponding to the C variable C<sv_undef>. + +=item sv_yes + +Returns the SV object corresponding to the C variable C<sv_yes>. + +=item sv_no + +Returns the SV object corresponding to the C variable C<sv_no>. + +=item svref_2object(SVREF) + +Takes a reference to any Perl value, and turns the referred-to value +into an object in the appropriate B::OP-derived or B::SV-derived +class. Apart from functions such as C<main_root>, this is the primary +way to get an initial "handle" on an internal perl data structure +which can then be followed with the other access methods. + +The returned object will only be valid as long as the underlying OPs +and SVs continue to exist. Do not attempt to use the object after the +underlying structures are freed. + +=item amagic_generation + +Returns the SV object corresponding to the C variable C<amagic_generation>. + +=item init_av + +Returns the AV object (i.e. in class B::AV) representing INIT blocks. + +=item check_av + +Returns the AV object (i.e. in class B::AV) representing CHECK blocks. + +=item unitcheck_av + +Returns the AV object (i.e. in class B::AV) representing UNITCHECK blocks. + +=item begin_av + +Returns the AV object (i.e. in class B::AV) representing BEGIN blocks. + +=item end_av + +Returns the AV object (i.e. in class B::AV) representing END blocks. + +=item comppadlist + +Returns the AV object (i.e. in class B::AV) of the global comppadlist. + +=item regex_padav + +Only when perl was compiled with ithreads. + +=item main_cv + +Return the (faked) CV corresponding to the main part of the Perl +program. + +=back + +=head2 Functions for Examining the Symbol Table + +=over 4 + +=item walksymtable(SYMREF, METHOD, RECURSE, PREFIX) + +Walk the symbol table starting at SYMREF and call METHOD on each +symbol (a B::GV object) visited. When the walk reaches package +symbols (such as "Foo::") it invokes RECURSE, passing in the symbol +name, and only recurses into the package if that sub returns true. + +PREFIX is the name of the SYMREF you're walking. + +For example: + + # Walk CGI's symbol table calling print_subs on each symbol. + # Recurse only into CGI::Util:: + walksymtable(\%CGI::, 'print_subs', sub { $_[0] eq 'CGI::Util::' }, + 'CGI::'); + +print_subs() is a B::GV method you have declared. Also see L<"B::GV +Methods">, below. + +=back + +=head2 Functions Returning C<B::OP> objects or for walking op trees + +For descriptions of the class hierarchy of these objects and the +methods that can be called on them, see below, L<"OVERVIEW OF +CLASSES"> and L<"OP-RELATED CLASSES">. + +=over 4 + +=item main_root + +Returns the root op (i.e. an object in the appropriate B::OP-derived +class) of the main part of the Perl program. + +=item main_start + +Returns the starting op of the main part of the Perl program. + +=item walkoptree(OP, METHOD) + +Does a tree-walk of the syntax tree based at OP and calls METHOD on +each op it visits. Each node is visited before its children. If +C<walkoptree_debug> (see below) has been called to turn debugging on then +the method C<walkoptree_debug> is called on each op before METHOD is +called. + +=item walkoptree_debug(DEBUG) + +Returns the current debugging flag for C<walkoptree>. If the optional +DEBUG argument is non-zero, it sets the debugging flag to that. See +the description of C<walkoptree> above for what the debugging flag +does. + +=back + +=head2 Miscellaneous Utility Functions + +=over 4 + +=item ppname(OPNUM) + +Return the PP function name (e.g. "pp_add") of op number OPNUM. + +=item hash(STR) + +Returns a string in the form "0x..." representing the value of the +internal hash function used by perl on string STR. + +=item cast_I32(I) + +Casts I to the internal I32 type used by that perl. + +=item minus_c + +Does the equivalent of the C<-c> command-line option. Obviously, this +is only useful in a BEGIN block or else the flag is set too late. + +=item cstring(STR) + +Returns a double-quote-surrounded escaped version of STR which can +be used as a string in C source code. + +=item perlstring(STR) + +Returns a double-quote-surrounded escaped version of STR which can +be used as a string in Perl source code. + +=item class(OBJ) + +Returns the class of an object without the part of the classname +preceding the first C<"::">. This is used to turn C<"B::UNOP"> into +C<"UNOP"> for example. + +=item threadsv_names + +In a perl compiled for threads, this returns a list of the special +per-thread threadsv variables. + +=back + +=head2 Exported utility variabiles + +=over 4 + +=item @optype + + my $op_type = $optype[$op_type_num]; + +A simple mapping of the op type number to its type (like 'COP' or 'BINOP'). + +=item @specialsv_name + + my $sv_name = $specialsv_name[$sv_index]; + +Certain SV types are considered 'special'. They're represented by +B::SPECIAL and are referred to by a number from the specialsv_list. +This array maps that number back to the name of the SV (like 'Nullsv' +or '&PL_sv_undef'). + +=back + + +=head1 OVERVIEW OF CLASSES + +The C structures used by Perl's internals to hold SV and OP +information (PVIV, AV, HV, ..., OP, SVOP, UNOP, ...) are modelled on a +class hierarchy and the C<B> module gives access to them via a true +object hierarchy. Structure fields which point to other objects +(whether types of SV or types of OP) are represented by the C<B> +module as Perl objects of the appropriate class. + +The bulk of the C<B> module is the methods for accessing fields of +these structures. + +Note that all access is read-only. You cannot modify the internals by +using this module. Also, note that the B::OP and B::SV objects created +by this module are only valid for as long as the underlying objects +exist; their creation doesn't increase the reference counts of the +underlying objects. Trying to access the fields of a freed object will +give incomprehensible results, or worse. + +=head2 SV-RELATED CLASSES + +B::IV, B::NV, B::RV, B::PV, B::PVIV, B::PVNV, B::PVMG, B::BM (5.9.5 and +earlier), B::PVLV, B::AV, B::HV, B::CV, B::GV, B::FM, B::IO. These classes +correspond in the obvious way to the underlying C structures of similar names. +The inheritance hierarchy mimics the underlying C "inheritance". For the +5.10.x branch, (I<ie> 5.10.0, 5.10.1 I<etc>) this is: + + B::SV + | + +------------+------------+------------+ + | | | | + B::PV B::IV B::NV B::RV + \ / / + \ / / + B::PVIV / + \ / + \ / + \ / + B::PVNV + | + | + B::PVMG + | + +-----+-----+-----+-----+ + | | | | | + B::AV B::GV B::HV B::CV B::IO + | | + | | + B::PVLV B::FM + +For 5.9.0 and earlier, PVLV is a direct subclass of PVMG, and BM is still +present as a distinct type, so the base of this diagram is + + + | + | + B::PVMG + | + +------+-----+-----+-----+-----+-----+ + | | | | | | | + B::PVLV B::BM B::AV B::GV B::HV B::CV B::IO + | + | + B::FM + +For 5.11.0 and later, B::RV is abolished, and IVs can be used to store +references, and a new type B::REGEXP is introduced, giving this structure: + + B::SV + | + +------------+------------+ + | | | + B::PV B::IV B::NV + \ / / + \ / / + B::PVIV / + \ / + \ / + \ / + B::PVNV + | + | + B::PVMG + | + +-------+-------+---+---+-------+-------+ + | | | | | | + B::AV B::GV B::HV B::CV B::IO B::REGEXP + | | + | | + B::PVLV B::FM + + +Access methods correspond to the underlying C macros for field access, +usually with the leading "class indication" prefix removed (Sv, Av, +Hv, ...). The leading prefix is only left in cases where its removal +would cause a clash in method name. For example, C<GvREFCNT> stays +as-is since its abbreviation would clash with the "superclass" method +C<REFCNT> (corresponding to the C function C<SvREFCNT>). + +=head2 B::SV Methods + +=over 4 + +=item REFCNT + +=item FLAGS + +=item object_2svref + +Returns a reference to the regular scalar corresponding to this +B::SV object. In other words, this method is the inverse operation +to the svref_2object() subroutine. This scalar and other data it points +at should be considered read-only: modifying them is neither safe nor +guaranteed to have a sensible effect. + +=back + +=head2 B::IV Methods + +=over 4 + +=item IV + +Returns the value of the IV, I<interpreted as +a signed integer>. This will be misleading +if C<FLAGS & SVf_IVisUV>. Perhaps you want the +C<int_value> method instead? + +=item IVX + +=item UVX + +=item int_value + +This method returns the value of the IV as an integer. +It differs from C<IV> in that it returns the correct +value regardless of whether it's stored signed or +unsigned. + +=item needs64bits + +=item packiv + +=back + +=head2 B::NV Methods + +=over 4 + +=item NV + +=item NVX + +=back + +=head2 B::RV Methods + +=over 4 + +=item RV + +=back + +=head2 B::PV Methods + +=over 4 + +=item PV + +This method is the one you usually want. It constructs a +string using the length and offset information in the struct: +for ordinary scalars it will return the string that you'd see +from Perl, even if it contains null characters. + +=item RV + +Same as B::RV::RV, except that it will die() if the PV isn't +a reference. + +=item PVX + +This method is less often useful. It assumes that the string +stored in the struct is null-terminated, and disregards the +length information. + +It is the appropriate method to use if you need to get the name +of a lexical variable from a padname array. Lexical variable names +are always stored with a null terminator, and the length field +(SvCUR) is overloaded for other purposes and can't be relied on here. + +=back + +=head2 B::PVMG Methods + +=over 4 + +=item MAGIC + +=item SvSTASH + +=back + +=head2 B::MAGIC Methods + +=over 4 + +=item MOREMAGIC + +=item precomp + +Only valid on r-magic, returns the string that generated the regexp. + +=item PRIVATE + +=item TYPE + +=item FLAGS + +=item OBJ + +Will die() if called on r-magic. + +=item PTR + +=item REGEX + +Only valid on r-magic, returns the integer value of the REGEX stored +in the MAGIC. + +=back + +=head2 B::PVLV Methods + +=over 4 + +=item TARGOFF + +=item TARGLEN + +=item TYPE + +=item TARG + +=back + +=head2 B::BM Methods + +=over 4 + +=item USEFUL + +=item PREVIOUS + +=item RARE + +=item TABLE + +=back + +=head2 B::GV Methods + +=over 4 + +=item is_empty + +This method returns TRUE if the GP field of the GV is NULL. + +=item NAME + +=item SAFENAME + +This method returns the name of the glob, but if the first +character of the name is a control character, then it converts +it to ^X first, so that *^G would return "^G" rather than "\cG". + +It's useful if you want to print out the name of a variable. +If you restrict yourself to globs which exist at compile-time +then the result ought to be unambiguous, because code like +C<${"^G"} = 1> is compiled as two ops - a constant string and +a dereference (rv2gv) - so that the glob is created at runtime. + +If you're working with globs at runtime, and need to disambiguate +*^G from *{"^G"}, then you should use the raw NAME method. + +=item STASH + +=item SV + +=item IO + +=item FORM + +=item AV + +=item HV + +=item EGV + +=item CV + +=item CVGEN + +=item LINE + +=item FILE + +=item FILEGV + +=item GvREFCNT + +=item FLAGS + +=back + +=head2 B::IO Methods + +=over 4 + +=item LINES + +=item PAGE + +=item PAGE_LEN + +=item LINES_LEFT + +=item TOP_NAME + +=item TOP_GV + +=item FMT_NAME + +=item FMT_GV + +=item BOTTOM_NAME + +=item BOTTOM_GV + +=item SUBPROCESS + +=item IoTYPE + +=item IoFLAGS + +=item IsSTD + +Takes one arguments ( 'stdin' | 'stdout' | 'stderr' ) and returns true +if the IoIFP of the object is equal to the handle whose name was +passed as argument ( i.e. $io->IsSTD('stderr') is true if +IoIFP($io) == PerlIO_stdin() ). + +=back + +=head2 B::AV Methods + +=over 4 + +=item FILL + +=item MAX + +=item ARRAY + +=item ARRAYelt + +Like C<ARRAY>, but takes an index as an argument to get only one element, +rather than a list of all of them. + +=item OFF + +This method is deprecated if running under Perl 5.8, and is no longer present +if running under Perl 5.9 + +=item AvFLAGS + +This method returns the AV specific flags. In Perl 5.9 these are now stored +in with the main SV flags, so this method is no longer present. + +=back + +=head2 B::CV Methods + +=over 4 + +=item STASH + +=item START + +=item ROOT + +=item GV + +=item FILE + +=item DEPTH + +=item PADLIST + +=item OUTSIDE + +=item OUTSIDE_SEQ + +=item XSUB + +=item XSUBANY + +For constant subroutines, returns the constant SV returned by the subroutine. + +=item CvFLAGS + +=item const_sv + +=back + +=head2 B::HV Methods + +=over 4 + +=item FILL + +=item MAX + +=item KEYS + +=item RITER + +=item NAME + +=item ARRAY + +=item PMROOT + +This method is not present if running under Perl 5.9, as the PMROOT +information is no longer stored directly in the hash. + +=back + +=head2 OP-RELATED CLASSES + +C<B::OP>, C<B::UNOP>, C<B::BINOP>, C<B::LOGOP>, C<B::LISTOP>, C<B::PMOP>, +C<B::SVOP>, C<B::PADOP>, C<B::PVOP>, C<B::LOOP>, C<B::COP>. + +These classes correspond in the obvious way to the underlying C +structures of similar names. The inheritance hierarchy mimics the +underlying C "inheritance": + + B::OP + | + +---------------+--------+--------+-------+ + | | | | | + B::UNOP B::SVOP B::PADOP B::COP B::PVOP + ,' `-. + / `--. + B::BINOP B::LOGOP + | + | + B::LISTOP + ,' `. + / \ + B::LOOP B::PMOP + +Access methods correspond to the underlying C structre field names, +with the leading "class indication" prefix (C<"op_">) removed. + +=head2 B::OP Methods + +These methods get the values of similarly named fields within the OP +data structure. See top of C<op.h> for more info. + +=over 4 + +=item next + +=item sibling + +=item name + +This returns the op name as a string (e.g. "add", "rv2av"). + +=item ppaddr + +This returns the function name as a string (e.g. "PL_ppaddr[OP_ADD]", +"PL_ppaddr[OP_RV2AV]"). + +=item desc + +This returns the op description from the global C PL_op_desc array +(e.g. "addition" "array deref"). + +=item targ + +=item type + +=item opt + +=item flags + +=item private + +=item spare + +=back + +=head2 B::UNOP METHOD + +=over 4 + +=item first + +=back + +=head2 B::BINOP METHOD + +=over 4 + +=item last + +=back + +=head2 B::LOGOP METHOD + +=over 4 + +=item other + +=back + +=head2 B::LISTOP METHOD + +=over 4 + +=item children + +=back + +=head2 B::PMOP Methods + +=over 4 + +=item pmreplroot + +=item pmreplstart + +=item pmnext + +Only up to Perl 5.9.4 + +=item pmregexp + +=item pmflags + +=item extflags + +Since Perl 5.9.5 + +=item precomp + +=item pmoffset + +Only when perl was compiled with ithreads. + +=back + +=head2 B::SVOP METHOD + +=over 4 + +=item sv + +=item gv + +=back + +=head2 B::PADOP METHOD + +=over 4 + +=item padix + +=back + +=head2 B::PVOP METHOD + +=over 4 + +=item pv + +=back + +=head2 B::LOOP Methods + +=over 4 + +=item redoop + +=item nextop + +=item lastop + +=back + +=head2 B::COP Methods + +=over 4 + +=item label + +=item stash + +=item stashpv + +=item file + +=item cop_seq + +=item arybase + +=item line + +=item warnings + +=item io + +=item hints + +=item hints_hash + +=back + + +=head1 AUTHOR + +Malcolm Beattie, C<mbeattie@sable.ox.ac.uk> + +=cut |