#
# Copyright 2002 Patrik Stridvall
#
# This library is free software; you can redistribute it and/or
# modify it under the terms of the GNU Lesser General Public
# License as published by the Free Software Foundation; either
# version 2.1 of the License, or (at your option) any later version.
#
# This library is distributed in the hope that it will be useful,
# but WITHOUT ANY WARRANTY; without even the implied warranty of
# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
# Lesser General Public License for more details.
#
# You should have received a copy of the GNU Lesser General Public
# License along with this library; if not, write to the Free Software
# Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301, USA
#

package c_type;

use strict;

use output qw($output);

sub _refresh($);

sub new($) {
    my $proto = shift;
    my $class = ref($proto) || $proto;
    my $self  = {};
    bless ($self, $class);

    return $self;
}

########################################################################
# set_find_align_callback
#
sub set_find_align_callback($$) {
    my $self = shift;

    my $find_align = \${$self->{FIND_ALIGN}};

    $$find_align = shift;
}

########################################################################
# set_find_kind_callback
#
sub set_find_kind_callback($$) {
    my $self = shift;

    my $find_kind = \${$self->{FIND_KIND}};

    $$find_kind = shift;
}

########################################################################
# set_find_size_callback
#
sub set_find_size_callback($$) {
    my $self = shift;

    my $find_size = \${$self->{FIND_SIZE}};

    $$find_size = shift;
}

########################################################################
# set_find_count_callback
#
sub set_find_count_callback($$) {
    my $self = shift;

    my $find_count = \${$self->{FIND_COUNT}};

    $$find_count = shift;
}

sub kind($$) {
    my $self = shift;
    my $kind = \${$self->{KIND}};
    my $dirty = \${$self->{DIRTY}};

    local $_ = shift;

    if(defined($_)) { $$kind = $_; $$dirty = 1; }

    if (!defined($$kind)) {
	$self->_refresh();
    }

    return $$kind;
}

sub _name($$) {
    my $self = shift;
    my $_name = \${$self->{_NAME}};
    my $dirty = \${$self->{DIRTY}};

    local $_ = shift;

    if(defined($_)) { $$_name = $_; $$dirty = 1; }

    return $$_name;
}

sub name($$) {
    my $self = shift;
    my $name = \${$self->{NAME}};
    my $dirty = \${$self->{DIRTY}};

    local $_ = shift;

    if(defined($_)) { $$name = $_; $$dirty = 1; }

    if($$name) {
	return $$name;
    } else {
	my $kind = \${$self->{KIND}};
	my $_name = \${$self->{_NAME}};

	return "$$kind $$_name";
    }
}

sub pack($$) {
    my $self = shift;
    my $pack = \${$self->{PACK}};
    my $dirty = \${$self->{DIRTY}};
    
    local $_ = shift;

    if(defined($_)) { $$pack = $_; $$dirty = 1; }

    return $$pack;
}

sub align($) {
    my $self = shift;

    my $align = \${$self->{ALIGN}};

    $self->_refresh();

    return $$align;
}

sub fields($) {
    my $self = shift;

    my $count = $self->field_count;

    my @fields = ();
    for (my $n = 0; $n < $count; $n++) {
	my $field = 'c_type_field'->new($self, $n);
	push @fields, $field;
    }
    return @fields;
}

sub field_base_sizes($) {
    my $self = shift;
    my $field_base_sizes = \${$self->{FIELD_BASE_SIZES}};

    $self->_refresh();

    return $$field_base_sizes;
}

sub field_aligns($) {
    my $self = shift;
    my $field_aligns = \${$self->{FIELD_ALIGNS}};

    $self->_refresh();

    return $$field_aligns;
}

sub field_count($) {
    my $self = shift;
    my $field_type_names = \${$self->{FIELD_TYPE_NAMES}};

    my @field_type_names = @{$$field_type_names}; 
    my $count = scalar(@field_type_names);

    return $count;
}

sub field_names($$) {
    my $self = shift;
    my $field_names = \${$self->{FIELD_NAMES}};
    my $dirty = \${$self->{DIRTY}};

    local $_ = shift;

    if(defined($_)) { $$field_names = $_; $$dirty = 1; }

    return $$field_names;
}

sub field_offsets($) {
    my $self = shift;
    my $field_offsets = \${$self->{FIELD_OFFSETS}};

    $self->_refresh();

    return $$field_offsets;
}

sub field_sizes($) {
    my $self = shift;
    my $field_sizes = \${$self->{FIELD_SIZES}};

    $self->_refresh();

    return $$field_sizes;
}

sub field_type_names($$) {
    my $self = shift;
    my $field_type_names = \${$self->{FIELD_TYPE_NAMES}};
    my $dirty = \${$self->{DIRTY}};

    local $_ = shift;

    if(defined($_)) { $$field_type_names = $_; $$dirty = 1; }

    return $$field_type_names;
}

sub size($) {
    my $self = shift;

    my $size = \${$self->{SIZE}};

    $self->_refresh();

    return $$size;
}

sub _refresh($) {
    my $self = shift;

    my $dirty = \${$self->{DIRTY}};

    return if !$$dirty;

    my $find_align = \${$self->{FIND_ALIGN}};
    my $find_kind = \${$self->{FIND_KIND}};
    my $find_size = \${$self->{FIND_SIZE}};
    my $find_count = \${$self->{FIND_COUNT}};

    my $align = \${$self->{ALIGN}};
    my $kind = \${$self->{KIND}};
    my $size = \${$self->{SIZE}};
    my $field_aligns = \${$self->{FIELD_ALIGNS}};
    my $field_base_sizes = \${$self->{FIELD_BASE_SIZES}};
    my $field_offsets = \${$self->{FIELD_OFFSETS}};
    my $field_sizes = \${$self->{FIELD_SIZES}};

    my $pack = $self->pack;
    $pack = 8 if !defined($pack);

    my $max_field_align = 0;

    my $offset = 0;
    my $bitfield_size = 0;
    my $bitfield_bits = 0;

    my $n = 0;
    foreach my $field ($self->fields) {
	my $type_name = $field->type_name;

        my $bits;
	my $count;
        if ($type_name =~ s/^(.*?)\s*(?:\[\s*(.*?)\s*\]|:(\d+))?$/$1/)
        {
            $count = $2;
            $bits = $3;
	}
        my $declspec_align;
        if ($type_name =~ s/\s+DECLSPEC_ALIGN\((\d+)\)//)
        {
            $declspec_align=$1;
        }
        my $base_size = &$$find_size($type_name);
        my $type_size=$base_size;
        if (defined $count)
        {
            $count=&$$find_count($count) if ($count !~ /^\d+$/);
            if (!defined $count)
            {
                $type_size=undef;
            }
            else
            {
                $type_size *= int($count);
            }
        }
        if ($bitfield_size != 0)
        {
            if (($type_name eq "" and defined $bits and $bits == 0) or
                (defined $type_size and $bitfield_size != $type_size) or
                !defined $bits or
                $bitfield_bits + $bits > 8 * $bitfield_size)
            {
                # This marks the end of the previous bitfield
                $bitfield_size=0;
                $bitfield_bits=0;
            }
            else
            {
                $bitfield_bits+=$bits;
                $n++;
                next;
            }
        }

        $$align = &$$find_align($type_name);
        $$align=$declspec_align if (defined $declspec_align);

        if (defined $$align)
        {
            $$align = $pack if $$align > $pack;
            $max_field_align = $$align if $$align > $max_field_align;

            if ($offset % $$align != 0) {
                $offset = (int($offset / $$align) + 1) * $$align;
            }
        }

        if ($$kind !~ /^(?:struct|union)$/)
        {
            $$kind = &$$find_kind($type_name) || "";
        }

        if (!$type_size)
        {
            $$align = undef;
            $$size = undef;
            return;
        }

        $$$field_aligns[$n] = $$align;
        $$$field_base_sizes[$n] = $base_size;
        $$$field_offsets[$n] = $offset;
        $$$field_sizes[$n] = $type_size;
        $offset += $type_size;

        if ($bits)
        {
            $bitfield_size=$type_size;
            $bitfield_bits=$bits;
        }
	$n++;
    }

    $$align = $pack;
    $$align = $max_field_align if $max_field_align < $pack;

    $$size = $offset;
    if ($$kind =~ /^(?:struct|union)$/) {
	if ($$size % $$align != 0) {
	    $$size = (int($$size / $$align) + 1) * $$align;
	}
    }

    $$dirty = 0;
}

package c_type_field;

sub new($$$) {
    my $proto = shift;
    my $class = ref($proto) || $proto;
    my $self  = {};
    bless ($self, $class);

    my $type = \${$self->{TYPE}};
    my $number = \${$self->{NUMBER}};

    $$type = shift;
    $$number = shift;

    return $self;
}

sub align($) {
    my $self = shift;
    my $type = \${$self->{TYPE}};
    my $number = \${$self->{NUMBER}};

    my $field_aligns = $$type->field_aligns;

    return $$field_aligns[$$number];
}

sub base_size($) {
    my $self = shift;
    my $type = \${$self->{TYPE}};
    my $number = \${$self->{NUMBER}};

    my $field_base_sizes = $$type->field_base_sizes;

    return $$field_base_sizes[$$number];
}

sub name($) {
    my $self = shift;
    my $type = \${$self->{TYPE}};
    my $number = \${$self->{NUMBER}};

    my $field_names = $$type->field_names;

    return $$field_names[$$number];
}

sub offset($) {
    my $self = shift;
    my $type = \${$self->{TYPE}};
    my $number = \${$self->{NUMBER}};

    my $field_offsets = $$type->field_offsets;

    return $$field_offsets[$$number];
}

sub size($) {
    my $self = shift;
    my $type = \${$self->{TYPE}};
    my $number = \${$self->{NUMBER}};

    my $field_sizes = $$type->field_sizes;

    return $$field_sizes[$$number];
}

sub type_name($) {
    my $self = shift;
    my $type = \${$self->{TYPE}};
    my $number = \${$self->{NUMBER}};

    my $field_type_names = $$type->field_type_names;

    return $$field_type_names[$$number];
}

1;