package B::Section;
my $output_fh;
my %sections;
-
+
sub new {
my ($class, $section, $symtable, $default) = @_;
$output_fh ||= FileHandle->new_tmpfile;
$sections{$section} = $obj;
return $obj;
}
-
+
sub get {
my ($class, $section) = @_;
return $sections{$section};
my $section = shift;
return $section->[2];
}
-
+
sub default {
my $section = shift;
return $section->[3];
}
-
+
sub output {
my ($section, $fh, $format) = @_;
my $name = $section->name;
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 hierachy 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.
+
+=item amagic_generation
+
+Returns the SV object corresponding to the C variable C<amagic_generation>.
+
+=item C<init_av>
+
+Returns the AV object (i.e. in class B::AV) representing INIT 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 C<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 hierachy 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
+
+
+
+
=head1 OVERVIEW OF CLASSES
The C structures used by Perl's internals to hold SV and OP
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
+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.
=head2 SV-RELATED CLASSES
B::IV, B::NV, B::RV, B::PV, B::PVIV, B::PVNV, B::PVMG, B::BM, 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". Access
-methods correspond to the underlying C macros for field access,
+inheritance hierarchy mimics the underlying C "inheritance":
+
+ B::SV
+ |
+ +--------------+----------------------+
+ | | |
+ B::PV B::IV B::RV
+ | \ / \
+ | \ / \
+ | B::PVIV B::NV
+ \ /
+ \____ __/
+ \ /
+ B::PVNV
+ |
+ |
+ B::PVMG
+ |
+ +------+-----+----+------+-----+-----+
+ | | | | | | |
+ B::PVLV B::BM B::AV B::GV B::HV B::CV B::IO
+ |
+ |
+ 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
+=head2 B::SV Methods
=over 4
=back
-=head2 B::IV METHODS
+=head2 B::IV Methods
=over 4
=back
-=head2 B::NV METHODS
+=head2 B::NV Methods
=over 4
=back
-=head2 B::RV METHODS
+=head2 B::RV Methods
=over 4
=back
-=head2 B::PV METHODS
+=head2 B::PV Methods
=over 4
=back
-=head2 B::PVMG METHODS
+=head2 B::PVMG Methods
=over 4
=back
-=head2 B::MAGIC METHODS
+=head2 B::MAGIC Methods
=over 4
=back
-=head2 B::PVLV METHODS
+=head2 B::PVLV Methods
=over 4
=back
-=head2 B::BM METHODS
+=head2 B::BM Methods
=over 4
=back
-=head2 B::GV METHODS
+=head2 B::GV Methods
=over 4
=back
-=head2 B::IO METHODS
+=head2 B::IO Methods
=over 4
=back
-=head2 B::AV METHODS
+=head2 B::AV Methods
=over 4
=back
-=head2 B::CV METHODS
+=head2 B::CV Methods
=over 4
=back
-=head2 B::HV METHODS
+=head2 B::HV Methods
=over 4
=head2 OP-RELATED CLASSES
-B::OP, B::UNOP, B::BINOP, B::LOGOP, B::LISTOP, B::PMOP,
-B::SVOP, B::PADOP, B::PVOP, B::CVOP, B::LOOP, 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". Access
-methods correspond to the underlying C structre field names, with the
-leading "class indication" prefix removed (op_).
-
-=head2 B::OP METHODS
+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::CVOP>, 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::CVOP B::COP
+ ,' `-.
+ / `--.
+ 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
=over 4
=back
-=head2 B::PMOP METHODS
+=head2 B::PMOP Methods
=over 4
=back
-=head2 B::LOOP METHODS
+=head2 B::LOOP Methods
=over 4
=back
-=head2 B::COP METHODS
+=head2 B::COP Methods
=over 4
=back
-=head1 FUNCTIONS EXPORTED BY C<B>
-
-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.
-
-=over 4
-
-=item main_cv
-
-Return the (faked) CV corresponding to the main part of the Perl
-program.
-
-=item init_av
-
-Returns the AV object (i.e. in class B::AV) representing INIT 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 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 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 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 amagic_generation
-
-Returns the SV object corresponding to the C variable C<amagic_generation>.
-
-=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> (q.v.) 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.
-
-=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.
- # Only recurse into CGI::Util::
- walksymtable(\%CGI::, 'print_subs', sub { $_[0] eq 'CGI::Util::' },
- 'CGI::');
-
-print_subs() is a B::GV method you have declared.
-
-
-=item svref_2object(SV)
-
-Takes any Perl variable and turns it 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.
-
-=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 "::". This is used to turn "B::UNOP" into
-"UNOP" for example.
-
-=item threadsv_names
-
-In a perl compiled for threads, this returns a list of the special
-per-thread threadsv variables.
-
-=back
=head1 AUTHOR
projects / p5sagit/p5-mst-13.2.git / commitdiff