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package B::Terse;
use strict;
use B qw(peekop class walkoptree_slow walkoptree_exec
main_start main_root cstring svref_2object);
use B::Asmdata qw(@specialsv_name);
sub terse {
my ($order, $cvref) = @_;
my $cv = svref_2object($cvref);
if ($order eq "exec") {
walkoptree_exec($cv->START, "terse");
} else {
walkoptree_slow($cv->ROOT, "terse");
}
}
sub compile {
my $order = shift;
my @options = @_;
B::clearsym();
if (@options) {
return sub {
my $objname;
foreach $objname (@options) {
$objname = "main::$objname" unless $objname =~ /::/;
eval "terse(\$order, \\&$objname)";
die "terse($order, \\&$objname) failed: $@" if $@;
}
}
} else {
if ($order eq "exec") {
return sub { walkoptree_exec(main_start, "terse") }
} else {
return sub { walkoptree_slow(main_root, "terse") }
}
}
}
sub indent {
my $level = shift;
return " " x $level;
}
sub B::OP::terse {
my ($op, $level) = @_;
my $targ = $op->targ;
$targ = ($targ > 0) ? " [$targ]" : "";
print indent($level), peekop($op), $targ, "\n";
}
sub B::SVOP::terse {
my ($op, $level) = @_;
print indent($level), peekop($op), " ";
$op->sv->terse(0);
}
sub B::PADOP::terse {
my ($op, $level) = @_;
print indent($level), peekop($op), " ", $op->padix, "\n";
}
sub B::PMOP::terse {
my ($op, $level) = @_;
my $precomp = $op->precomp;
print indent($level), peekop($op),
defined($precomp) ? " /$precomp/\n" : " (regexp not compiled)\n";
}
sub B::PVOP::terse {
my ($op, $level) = @_;
print indent($level), peekop($op), " ", cstring($op->pv), "\n";
}
sub B::COP::terse {
my ($op, $level) = @_;
my $label = $op->label;
if ($label) {
$label = " label ".cstring($label);
}
print indent($level), peekop($op), $label || "", "\n";
}
sub B::PV::terse {
my ($sv, $level) = @_;
print indent($level);
printf "%s (0x%lx) %s\n", class($sv), $$sv, cstring($sv->PV);
}
sub B::AV::terse {
my ($sv, $level) = @_;
print indent($level);
printf "%s (0x%lx) FILL %d\n", class($sv), $$sv, $sv->FILL;
}
sub B::GV::terse {
my ($gv, $level) = @_;
my $stash = $gv->STASH->NAME;
if ($stash eq "main") {
$stash = "";
} else {
$stash = $stash . "::";
}
print indent($level);
printf "%s (0x%lx) *%s%s\n", class($gv), $$gv, $stash, $gv->NAME;
}
sub B::IV::terse {
my ($sv, $level) = @_;
print indent($level);
printf "%s (0x%lx) %d\n", class($sv), $$sv, $sv->IV;
}
sub B::NV::terse {
my ($sv, $level) = @_;
print indent($level);
printf "%s (0x%lx) %s\n", class($sv), $$sv, $sv->NV;
}
sub B::NULL::terse {
my ($sv, $level) = @_;
print indent($level);
printf "%s (0x%lx)\n", class($sv), $$sv;
}
sub B::SPECIAL::terse {
my ($sv, $level) = @_;
print indent($level);
printf "%s #%d %s\n", class($sv), $$sv, $specialsv_name[$$sv];
}
1;
__END__
=head1 NAME
B::Terse - Walk Perl syntax tree, printing terse info about ops
=head1 SYNOPSIS
perl -MO=Terse[,OPTIONS] foo.pl
=head1 DESCRIPTION
See F<ext/B/README>.
=head1 AUTHOR
Malcolm Beattie, C<mbeattie@sable.ox.ac.uk>
=cut
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