=head1 VERSION
-Version 0.01
+Version 0.02
=cut
sub dl_load_flags { 0x01 }
BEGIN {
- $VERSION = '0.01';
+ $VERSION = '0.02';
require DynaLoader;
push @ISA, 'DynaLoader';
__PACKAGE__->bootstrap($VERSION);
BOOT:
{
- sub_op_keyword k;
- k.name = "reftype";
- k.len = sizeof("reftype")-1;
- k.check = 0;
- k.pp = scalar_util_reftype;
- sub_op_register(aTHX_ &k);
+ sub_op_config_t c;
+ sub_op_init(&c);
+ c.name = "reftype";
+ c.namelen = sizeof("reftype")-1;
+ c.pp = scalar_util_reftype;
+ c.check = 0;
+ c.ud = NULL;
+ sub_op_register(aTHX_ &c, 0);
}
In your Perl module file :
...
);
+=head1 DESCRIPTION
+
+This module provides a C and Perl API for replacing subroutine calls by custom opcodes.
+This has two main advantages :
+
+=over 4
+
+=item *
+
+it gets rid of the overhead of a normal subroutine call ;
+
+=item *
+
+there's no symbol table entry defined for the subroutine.
+
+=back
+
+Subroutine calls with and without parenthesis are handled.
+Ampersand calls are B<not> replaced, and as such will still allow to call a subroutine with same name defined earlier.
+This may or may not be considered as a bug, but it gives the same semantics as Perl keywords, so I believe it's reasonable.
+
+When L<B> and L<B::Deparse> are loaded, they get automatically monkeypatched so that introspecting modules like L<B::Concise> and L<B::Deparse> still produce a valid output.
+
=cut
+use Scalar::Util;
+
use B::Hooks::EndOfScope;
use Variable::Magic 0.08;
my $pkg = $data->{pkg};
my $fqn = join '::', $pkg, $name;
- _incoming($name, $pkg);
-
- no strict 'refs';
- *$fqn = $placeholder unless exists &$fqn;
+ {
+ local $SIG{__WARN__} = sub {
+ CORE::warn(@_) unless $_[0] =~ /^Constant subroutine.*redefined/;
+ } if _constant_sub(do { no strict 'refs'; \&$fqn });
+ no strict 'refs';
+ no warnings 'redefine';
+ *$fqn = $placeholder;
+ }
return;
},
);
+sub _tag {
+ my ($pkg, $name) = @_;
+
+ my $fqn = join '::', $pkg, $name;
+
+ return {
+ old => _defined_sub($fqn) ? \&$fqn : undef,
+ proto => prototype($fqn),
+ };
+}
+
sub _map {
my ($pkg) = @_;
sub _cast {
my ($pkg, $name) = @_;
- no strict 'refs';
- Variable::Magic::cast(%{"${pkg}::"}, $sw, $pkg, { $name => 1 });
+ my $map = { $name => _tag(@_) };
+
+ {
+ no strict 'refs';
+ Variable::Magic::cast(%{"${pkg}::"}, $sw, $pkg, $map);
+ }
+
+ return $map;
}
sub _dispell {
Variable::Magic::dispell(%{"${pkg}::"}, $sw);
}
+=head1 C API
+
+=head2 C<sub_op_config_t>
+
+A typedef'd struct that configures how L<Sub::Op> should handle a given subroutine name.
+It has the following members :
+
+=over 4
+
+=item *
+
+C<const char *name>
+
+The name of the subroutine you want to replace.
+Allowed to be static.
+
+=item *
+
+C<STRLEN namelen>
+
+C<name>'s length, in bytes.
+
+=item *
+
+C<Perl_ppaddr_t pp>
+
+The pp function that will be called instead of the subroutine.
+C<Perl_ppaddr_t> is a typedef'd function pointer defined by perl as :
+
+ typedef OP *(*Perl_ppaddr_t)(pTHX);
+
+=item *
+
+C<sub_op_check_t check>
+
+An optional callback that will be called each time a call to C<name> is replaced.
+You can use it to attach extra info to those ops (e.g. with a pointer table) or to perform more optimizations to the optree.
+C<sub_op_check_t> is a typedef'd function pointer defined by :
+
+ typedef OP *(*sub_op_check_t)(pTHX_ OP *, void *);
+
+=item *
+
+C<void *ud>
+
+An optional user data passed to the C<check> callback.
+
+=back
+
+=head2 C<void sub_op_init(sub_op_config_t *c)>
+
+Initializes the fields of the C<sub_op_config_t> object.
+For future compatibility, it is required to call this function with your config object before storing your actual values.
+It will store safe defaults for members you won't set.
+
+=head2 C<void sub_op_register(pTHX_ const sub_op_config_t *c, U32 flags)>
+
+Registers a name and its configuration into L<Sub::Op>.
+The caller is responsible for allocating and freeing the C<sub_op_config_t> object.
+No pointer to it or to its members is kept, except if you pass the flag C<SUB_OP_REGISTER_STEAL> in which case the configuration object will be stolen to be stored into L<Sub::Op>'s internal datastructure.
+
+=head2 C<sub_op_config_t *sub_op_dup(pTHX_ const sub_op_config_t *orig)>
+
+Deeply clones the specified C<sub_op_config_t> object.
+
+=head2 C<void sub_op_free(pTHX_ sub_op_config_t *c)>
+
+Free the memory associated with the specified C<sub_op_config_t> object.
+
+=head1 PERL API
+
+=head2 C<enable $name, [ $pkg ]>
+
+Enable the replacement with a custom opcode of calls to the C<$name> subroutine of the C<$pkg> package in the current lexical scope.
+A pp callback must have been registered for C<$name> by calling the C function C<sub_op_register> in the XS section of your module.
+
+When C<$pkg> is not set, it defaults to the caller package.
+
+=cut
+
sub enable {
my $name = shift;
my $pkg = @_ > 0 ? $_[0] : caller;
- my $fqn = "${pkg}::$name";
-
my $map = _map($pkg);
if (defined $map) {
- $map->{$name} = 1;
+ $map->{$name} = _tag($pkg, $name);
} else {
- _cast($pkg, $name);
+ $map = _cast($pkg, $name);
+ }
+
+ my $proto = $map->{$name}->{proto};
+ if (defined $proto) {
+ no strict 'refs';
+ Scalar::Util::set_prototype(\&{"${pkg}::$name"}, undef);
}
$^H |= 0x00020000;
return;
}
+=head2 C<disable $name, [ $pkg ]>
+
+Disable the replacement for calls to C<$name> in the package C<$pkg>.
+
+When C<$pkg> is not set, it defaults to the caller package.
+
+=cut
+
sub disable {
my $name = shift;
my $pkg = @_ > 0 ? $_[0] : caller;
- my $fqn = "${pkg}::$name";
-
my $map = _map($pkg);
+ my $fqn = join '::', $pkg, $name;
+
if (defined $map) {
+ my $tag = $map->{$name};
+
+ my $old = $tag->{old};
+ if (defined $old) {
+ no strict 'refs';
+ no warnings 'redefine';
+ *$fqn = $old;
+ }
+
+ my $proto = $tag->{proto};
+ if (defined $proto) {
+ no strict 'refs';
+ Scalar::Util::set_prototype(\&$fqn, $proto);
+ }
+
delete $map->{$name};
unless (keys %$map) {
_dispell($pkg);
}
}
+sub _defined_sub {
+ my ($fqn) = @_;
+ my @parts = split /::/, $fqn;
+ my $name = pop @parts;
+ my $pkg = '';
+ for (@parts) {
+ $pkg .= $_ . '::';
+ return 0 unless do { no strict 'refs'; %$pkg };
+ }
+ return do { no strict 'refs'; defined &{"$pkg$name"} };
+}
+
{
my $injector;
BEGIN {
$B_OP_inject{can} = sub {
my ($obj, $meth) = @_;
if ($meth eq 'first') {
- return undef unless defined _custom_name($obj);
+ return undef unless $obj->isa('B::UNOP') or defined _custom_name($obj);
}
$obj->SUPER::can($meth);
};
- if (%B:: and %B::OP:: and *B::OP::type{CODE}) {
+ if (_defined_sub('B::OP::type')) {
_inject('B::OP', \%B_OP_inject);
} else {
- Variable::Magic::cast %B::OP::, $injector, 'B::OP', \%B_OP_inject;
+ no strict 'refs';
+ Variable::Magic::cast %{'B::OP::'}, $injector, 'B::OP', \%B_OP_inject;
}
my $B_Deparse_inject = {
my ($self, $op, $cx) = @_;
my $name = _custom_name($op);
die 'unhandled custom op' unless defined $name;
- if ($op->flags & B::OPf_STACKED()) {
+ if ($op->flags & do { no strict 'refs'; &{'B::OPf_STACKED'}() }) {
my $kid = $op->first;
$kid = $kid->first->sibling; # skip ex-list, pushmark
my @exprs;
- for (; not B::Deparse::null($kid); $kid = $kid->sibling) {
+ while (not do { no strict 'refs'; &{'B::Deparse::null'}($kid) }) {
push @exprs, $self->deparse($kid, 6);
+ $kid = $kid->sibling;
}
my $args = join(", ", @exprs);
return "$name($args)";
},
};
- if (%B:: and %B::Deparse:: and *B::Deparse::pp_entersub{CODE}) {
+ if (_defined_sub('B::Deparse::pp_entersub')) {
_inject('B::Deparse', $B_Deparse_inject);
} else {
- Variable::Magic::cast %B::Deparse::, $injector, 'B::Deparse', $B_Deparse_inject;
+ no strict 'refs';
+ Variable::Magic::cast %{'B::Deparse::'}, $injector, 'B::Deparse', $B_Deparse_inject;
}
}
}
BEGIN { _monkeypatch() }
+=head1 EXAMPLES
+
+See the F<t/Sub-Op-LexicalSub> directory that implements a complete example.
+
+=head1 CAVEATS
+
+Preexistent definitions of a sub whose name is handled by L<Sub::Op> are restored at the end of the lexical scope in which the module is used.
+But if you define a sub in the scope of action of L<Sub::Op> with a name that is currently being replaced, the new declaration will be obliterated at the scope end.
+
+Function calls without parenthesis inside an C<eval STRING> in the scope of the pragma won't be replaced.
+I know a few ways of fixing this, but I've not yet decided on which.
+
=head1 DEPENDENCIES
L<perl> 5.10.
L<subs::auto>.
+L<B::Hooks::XSUB::CallAsOp> provides a C API to declare XSUBs that effectively call a specific PP function.
+Thus, it allows you to write XSUBs with the PP stack conventions used for implementing perl core keywords.
+There's no opcode replacement and no parsing hacks.
+
L<B::Hooks::OP::Check::EntersubForCV>.
=head1 AUTHOR
projects / perl / modules / Sub-Op.git / blobdiff