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# This file is part of the nesC compiler.
# Copyright (C) 2002 Intel Corporation
#
# The attached "nesC" software is provided to you under the terms and
# conditions of the GNU General Public License Version 2 as published by the
# Free Software Foundation.
#
# nesC 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 General Public License for more details.
#
# You should have received a copy of the GNU General Public License
# along with nesC; see the file COPYING. If not, write to
# the Free Software Foundation, 59 Temple Place - Suite 330,
# Boston, MA 02111-1307, USA.
true;
# Decode spec into a generator-friendly form
# takes spec as arguments, leaves results in the following global vars:
# $size = bit size of message
# $amtype = active message type (-1 if unknown)
# @fields: array of field-specs. Each field-spec is a reference to an array:
# 0: name
# 1: base_type (U, I, BU, BI, F, D, LD)
# 2: length (in bits)
# 3-6: field access spec, as follows:
# 3: base_offset
# 4-6: refs to arrays with 1 element per index needed to access field
# 4: amax (the original C array size)
# 5: abit_size (of corresponding array element)
# 6: abit_offset (of corresponding array)
# the offset of the field, given index[1], ..., index[n] (n >= 0) is
# computed as follows:
# offset = base offset
# for i = 1 to n:
# assert index[i] >= 0 && index[i] < amax[i]
# offset += abit_size[i] * index[i] + abit_offset[i]
sub decode() {
@spec = @_;
$_ = shift @spec;
/^((nx_)?struct|union) .* ([0-9]+) ([-0-9]+)/ or die;
$size = $3;
$amtype = $4;
$base = 0;
for (@spec) {
# remove end of line stuff to avoid confusion w/ cygwin
chop;
s/\r$//;
/ *(.*)/;
@specline = split / /, $1;
($field, $type, $offset, $bitlength) = @specline;
$basetype = &basetype($type);
@field_array_max = &arraymax($type);
@field_array_bitsize = &arraybitsize($bitlength, @field_array_max);
push @array_max, @field_array_max;
push @array_bitsize, @field_array_bitsize;
for ($i = 0; $i < @field_array_max; $i++) {
push @array_offset, 0;
}
if ($basetype eq "PUSH") {
if (@field_array_max) {
push @array_push_size, $#field_array_max + 1;
$array_offset[$#array_offset - $#field_array_max] = $base + $offset;
push @bases, $base;
$base = 0;
}
else {
push @bases, $base;
push @array_push_size, 0;
$base += $offset;
}
}
elsif ($basetype eq "POP") {
$base = pop @bases;
&poparray(pop @array_push_size);
}
else {
push @fields, [ $field, $basetype, $bitlength, $base + $offset,
[ @array_max ], [ @array_bitsize ], [ @array_offset ] ];
&poparray($#field_array_max + 1);
}
}
}
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