diff options
Diffstat (limited to 'Master/tlpkg/tlperl.old/lib/B/Stackobj.pm')
-rw-r--r-- | Master/tlpkg/tlperl.old/lib/B/Stackobj.pm | 349 |
1 files changed, 0 insertions, 349 deletions
diff --git a/Master/tlpkg/tlperl.old/lib/B/Stackobj.pm b/Master/tlpkg/tlperl.old/lib/B/Stackobj.pm deleted file mode 100644 index b17dfb8173a..00000000000 --- a/Master/tlpkg/tlperl.old/lib/B/Stackobj.pm +++ /dev/null @@ -1,349 +0,0 @@ -# Stackobj.pm -# -# Copyright (c) 1996 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::Stackobj; - -our $VERSION = '1.00'; - -use Exporter (); -@ISA = qw(Exporter); -@EXPORT_OK = qw(set_callback T_UNKNOWN T_DOUBLE T_INT VALID_UNSIGNED - VALID_INT VALID_DOUBLE VALID_SV REGISTER TEMPORARY); -%EXPORT_TAGS = (types => [qw(T_UNKNOWN T_DOUBLE T_INT)], - flags => [qw(VALID_INT VALID_DOUBLE VALID_SV - VALID_UNSIGNED REGISTER TEMPORARY)]); - -use Carp qw(confess); -use strict; -use B qw(class SVf_IOK SVf_NOK SVf_IVisUV); - -# Types -sub T_UNKNOWN () { 0 } -sub T_DOUBLE () { 1 } -sub T_INT () { 2 } -sub T_SPECIAL () { 3 } - -# Flags -sub VALID_INT () { 0x01 } -sub VALID_UNSIGNED () { 0x02 } -sub VALID_DOUBLE () { 0x04 } -sub VALID_SV () { 0x08 } -sub REGISTER () { 0x10 } # no implicit write-back when calling subs -sub TEMPORARY () { 0x20 } # no implicit write-back needed at all -sub SAVE_INT () { 0x40 } #if int part needs to be saved at all -sub SAVE_DOUBLE () { 0x80 } #if double part needs to be saved at all - - -# -# Callback for runtime code generation -# -my $runtime_callback = sub { confess "set_callback not yet called" }; -sub set_callback (&) { $runtime_callback = shift } -sub runtime { &$runtime_callback(@_) } - -# -# Methods -# - -sub write_back { confess "stack object does not implement write_back" } - -sub invalidate { shift->{flags} &= ~(VALID_INT |VALID_UNSIGNED | VALID_DOUBLE) } - -sub as_sv { - my $obj = shift; - if (!($obj->{flags} & VALID_SV)) { - $obj->write_back; - $obj->{flags} |= VALID_SV; - } - return $obj->{sv}; -} - -sub as_int { - my $obj = shift; - if (!($obj->{flags} & VALID_INT)) { - $obj->load_int; - $obj->{flags} |= VALID_INT|SAVE_INT; - } - return $obj->{iv}; -} - -sub as_double { - my $obj = shift; - if (!($obj->{flags} & VALID_DOUBLE)) { - $obj->load_double; - $obj->{flags} |= VALID_DOUBLE|SAVE_DOUBLE; - } - return $obj->{nv}; -} - -sub as_numeric { - my $obj = shift; - return $obj->{type} == T_INT ? $obj->as_int : $obj->as_double; -} - -sub as_bool { - my $obj=shift; - if ($obj->{flags} & VALID_INT ){ - return $obj->{iv}; - } - if ($obj->{flags} & VALID_DOUBLE ){ - return $obj->{nv}; - } - return sprintf("(SvTRUE(%s))", $obj->as_sv) ; -} - -# -# Debugging methods -# -sub peek { - my $obj = shift; - my $type = $obj->{type}; - my $flags = $obj->{flags}; - my @flags; - if ($type == T_UNKNOWN) { - $type = "T_UNKNOWN"; - } elsif ($type == T_INT) { - $type = "T_INT"; - } elsif ($type == T_DOUBLE) { - $type = "T_DOUBLE"; - } else { - $type = "(illegal type $type)"; - } - push(@flags, "VALID_INT") if $flags & VALID_INT; - push(@flags, "VALID_DOUBLE") if $flags & VALID_DOUBLE; - push(@flags, "VALID_SV") if $flags & VALID_SV; - push(@flags, "REGISTER") if $flags & REGISTER; - push(@flags, "TEMPORARY") if $flags & TEMPORARY; - @flags = ("none") unless @flags; - return sprintf("%s type=$type flags=%s sv=$obj->{sv}", - class($obj), join("|", @flags)); -} - -sub minipeek { - my $obj = shift; - my $type = $obj->{type}; - my $flags = $obj->{flags}; - if ($type == T_INT || $flags & VALID_INT) { - return $obj->{iv}; - } elsif ($type == T_DOUBLE || $flags & VALID_DOUBLE) { - return $obj->{nv}; - } else { - return $obj->{sv}; - } -} - -# -# Caller needs to ensure that set_int, set_double, -# set_numeric and set_sv are only invoked on legal lvalues. -# -sub set_int { - my ($obj, $expr,$unsigned) = @_; - runtime("$obj->{iv} = $expr;"); - $obj->{flags} &= ~(VALID_SV | VALID_DOUBLE); - $obj->{flags} |= VALID_INT|SAVE_INT; - $obj->{flags} |= VALID_UNSIGNED if $unsigned; -} - -sub set_double { - my ($obj, $expr) = @_; - runtime("$obj->{nv} = $expr;"); - $obj->{flags} &= ~(VALID_SV | VALID_INT); - $obj->{flags} |= VALID_DOUBLE|SAVE_DOUBLE; -} - -sub set_numeric { - my ($obj, $expr) = @_; - if ($obj->{type} == T_INT) { - $obj->set_int($expr); - } else { - $obj->set_double($expr); - } -} - -sub set_sv { - my ($obj, $expr) = @_; - runtime("SvSetSV($obj->{sv}, $expr);"); - $obj->invalidate; - $obj->{flags} |= VALID_SV; -} - -# -# Stackobj::Padsv -# - -@B::Stackobj::Padsv::ISA = 'B::Stackobj'; -sub B::Stackobj::Padsv::new { - my ($class, $type, $extra_flags, $ix, $iname, $dname) = @_; - $extra_flags |= SAVE_INT if $extra_flags & VALID_INT; - $extra_flags |= SAVE_DOUBLE if $extra_flags & VALID_DOUBLE; - bless { - type => $type, - flags => VALID_SV | $extra_flags, - sv => "PL_curpad[$ix]", - iv => "$iname", - nv => "$dname" - }, $class; -} - -sub B::Stackobj::Padsv::load_int { - my $obj = shift; - if ($obj->{flags} & VALID_DOUBLE) { - runtime("$obj->{iv} = $obj->{nv};"); - } else { - runtime("$obj->{iv} = SvIV($obj->{sv});"); - } - $obj->{flags} |= VALID_INT|SAVE_INT; -} - -sub B::Stackobj::Padsv::load_double { - my $obj = shift; - $obj->write_back; - runtime("$obj->{nv} = SvNV($obj->{sv});"); - $obj->{flags} |= VALID_DOUBLE|SAVE_DOUBLE; -} -sub B::Stackobj::Padsv::save_int { - my $obj = shift; - return $obj->{flags} & SAVE_INT; -} - -sub B::Stackobj::Padsv::save_double { - my $obj = shift; - return $obj->{flags} & SAVE_DOUBLE; -} - -sub B::Stackobj::Padsv::write_back { - my $obj = shift; - my $flags = $obj->{flags}; - return if $flags & VALID_SV; - if ($flags & VALID_INT) { - if ($flags & VALID_UNSIGNED ){ - runtime("sv_setuv($obj->{sv}, $obj->{iv});"); - }else{ - runtime("sv_setiv($obj->{sv}, $obj->{iv});"); - } - } elsif ($flags & VALID_DOUBLE) { - runtime("sv_setnv($obj->{sv}, $obj->{nv});"); - } else { - confess "write_back failed for lexical @{[$obj->peek]}\n"; - } - $obj->{flags} |= VALID_SV; -} - -# -# Stackobj::Const -# - -@B::Stackobj::Const::ISA = 'B::Stackobj'; -sub B::Stackobj::Const::new { - my ($class, $sv) = @_; - my $obj = bless { - flags => 0, - sv => $sv # holds the SV object until write_back happens - }, $class; - if ( ref($sv) eq "B::SPECIAL" ){ - $obj->{type}= T_SPECIAL; - }else{ - my $svflags = $sv->FLAGS; - if ($svflags & SVf_IOK) { - $obj->{flags} = VALID_INT|VALID_DOUBLE; - $obj->{type} = T_INT; - if ($svflags & SVf_IVisUV){ - $obj->{flags} |= VALID_UNSIGNED; - $obj->{nv} = $obj->{iv} = $sv->UVX; - }else{ - $obj->{nv} = $obj->{iv} = $sv->IV; - } - } elsif ($svflags & SVf_NOK) { - $obj->{flags} = VALID_INT|VALID_DOUBLE; - $obj->{type} = T_DOUBLE; - $obj->{iv} = $obj->{nv} = $sv->NV; - } else { - $obj->{type} = T_UNKNOWN; - } - } - return $obj; -} - -sub B::Stackobj::Const::write_back { - my $obj = shift; - return if $obj->{flags} & VALID_SV; - # Save the SV object and replace $obj->{sv} by its C source code name - $obj->{sv} = $obj->{sv}->save; - $obj->{flags} |= VALID_SV|VALID_INT|VALID_DOUBLE; -} - -sub B::Stackobj::Const::load_int { - my $obj = shift; - if (ref($obj->{sv}) eq "B::RV"){ - $obj->{iv} = int($obj->{sv}->RV->PV); - }else{ - $obj->{iv} = int($obj->{sv}->PV); - } - $obj->{flags} |= VALID_INT; -} - -sub B::Stackobj::Const::load_double { - my $obj = shift; - if (ref($obj->{sv}) eq "B::RV"){ - $obj->{nv} = $obj->{sv}->RV->PV + 0.0; - }else{ - $obj->{nv} = $obj->{sv}->PV + 0.0; - } - $obj->{flags} |= VALID_DOUBLE; -} - -sub B::Stackobj::Const::invalidate {} - -# -# Stackobj::Bool -# - -@B::Stackobj::Bool::ISA = 'B::Stackobj'; -sub B::Stackobj::Bool::new { - my ($class, $preg) = @_; - my $obj = bless { - type => T_INT, - flags => VALID_INT|VALID_DOUBLE, - iv => $$preg, - nv => $$preg, - preg => $preg # this holds our ref to the pseudo-reg - }, $class; - return $obj; -} - -sub B::Stackobj::Bool::write_back { - my $obj = shift; - return if $obj->{flags} & VALID_SV; - $obj->{sv} = "($obj->{iv} ? &PL_sv_yes : &PL_sv_no)"; - $obj->{flags} |= VALID_SV; -} - -# XXX Might want to handle as_double/set_double/load_double? - -sub B::Stackobj::Bool::invalidate {} - -1; - -__END__ - -=head1 NAME - -B::Stackobj - Helper module for CC backend - -=head1 SYNOPSIS - - use B::Stackobj; - -=head1 DESCRIPTION - -See F<ext/B/README>. - -=head1 AUTHOR - -Malcolm Beattie, C<mbeattie@sable.ox.ac.uk> - -=cut |