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#!/usr/bin/perl
#
# insns.pl produce insnsa.c and insnsd.c from insns.dat
#
# The Netwide Assembler is copyright (C) 1996 Simon Tatham and
# Julian Hall. All rights reserved. The software is
# redistributable under the licence given in the file "Licence"
# distributed in the NASM archive.
print STDERR "Reading insns.dat...\n";
open (F, "insns.dat") || die "unable to open insns.dat";
$line = 0;
$opcodes = 0;
$insns = 0;
while (<F>) {
$line++;
next if /^\s*;/; # comments
chomp;
split;
next if $#_ == -1; # blank lines
(warn "line $line does not contain four fields\n"), next if $#_ != 3;
$formatted = &format(@_);
if ($formatted) {
$insns++;
$aname = "aa_$_[0]";
push @$aname, $formatted;
}
$opcodes[$opcodes++] = $_[0], $done{$_[0]} = 1 if !$done{$_[0]};
if ($formatted && $formatted !~ /IF_ND/) {
push @big, $formatted;
foreach $i (&startbyte($_[2])) {
$aname = sprintf "dd_%02X",$i;
push @$aname, $#big;
}
}
}
close F;
print STDERR "Writing insnsa.c...\n";
open A, ">insnsa.c";
print A "/* This file auto-generated from insns.dat by insns.pl" .
" - don't edit it */\n\n";
print A "#include <stdio.h>\n";
print A "#include \"nasm.h\"\n";
print A "#include \"insns.h\"\n";
print A "\n";
foreach $i (@opcodes) {
print A "static struct itemplate instrux_${i}[] = {\n";
$aname = "aa_$i";
foreach $j (@$aname) {
print A " $j\n";
}
print A " {-1}\n};\n\n";
}
print A "struct itemplate *nasm_instructions[] = {\n";
foreach $i (@opcodes) {
print A " instrux_${i},\n";
}
print A "};\n";
close A;
print STDERR "Writing insnsd.c...\n";
open D, ">insnsd.c";
print D "/* This file auto-generated from insns.dat by insns.pl" .
" - don't edit it */\n\n";
print D "#include <stdio.h>\n";
print D "#include \"nasm.h\"\n";
print D "#include \"insns.h\"\n";
print D "\n";
print D "static struct itemplate instrux[] = {\n";
foreach $j (@big) {
print D " $j\n";
}
print D " {-1}\n};\n\n";
for ($c=0; $c<256; $c++) {
$h = sprintf "%02X", $c;
print D "static struct itemplate *itable_${h}[] = {\n";
$aname = "dd_$h";
foreach $j (@$aname) {
print D " instrux + $j,\n";
}
print D " NULL\n};\n\n";
}
print D "struct itemplate **itable[] = {\n";
for ($c=0; $c<256; $c++) {
printf D " itable_%02X,\n", $c;
}
print D "};\n";
close D;
printf STDERR "Done: %d instructions\n", $insns;
sub format {
local ($opcode, $operands, $codes, $flags) = @_;
local $num;
return undef if $operands eq "ignore";
# format the operands
$operands =~ s/:/|colon,/g;
$operands =~ s/mem(\d+)/mem|bits$1/g;
$operands =~ s/mem/memory/g;
$operands =~ s/memory_offs/mem_offs/g;
$operands =~ s/imm(\d+)/imm|bits$1/g;
$operands =~ s/imm/immediate/g;
$operands =~ s/rm(\d+)/regmem|bits$1/g;
$num = 3;
$operands = '0,0,0', $num = 0 if $operands eq 'void';
$operands .= ',0', $num-- while $operands !~ /,.*,/;
$operands =~ tr/a-z/A-Z/;
# format the flags
$flags =~ s/,/|IF_/g;
$flags = "IF_" . $flags;
"{I_$opcode, $num, {$operands}, \"$codes\", $flags},";
}
# Here we determine the range of possible starting bytes for a given
# instruction. We need only consider the codes:
# \1 \2 \3 mean literal bytes, of course
# \4 \5 \6 \7 mean PUSH/POP of segment registers: special case
# \10 \11 \12 mean byte plus register value
# \17 means byte zero
# \330 means byte plus condition code
# \0 or \340 mean give up and return empty set
sub startbyte { # FIXME we cheat, for now :-)
local ($codes) = @_;
local $word, @range;
while (1) {
die "couldn't get code in '$codes'" if $codes !~ /^(\\[^\\]+)(\\.*)?$/;
$word = $1, $codes = $2;
return (hex $1) if $word =~ /^\\[123]$/ && $codes =~ /^\\x(..)/;
return (0x07, 0x17, 0x1F) if $word eq "\\4";
return (0xA1, 0xA9) if $word eq "\\5";
return (0x06, 0x0E, 0x16, 0x1E) if $word eq "\\6";
return (0xA0, 0xA8) if $word eq "\\7";
$start=hex $1, $r=8, last if $word =~ /^\\1[012]$/ && $codes =~/^\\x(..)/;
return (0) if $word eq "\\17";
$start=hex $1, $r=16, last if $word =~ /^\\330$/ && $codes =~ /^\\x(..)/;
return () if $word eq "\\0" || $word eq "\\340";
}
@range = ();
push @range, $start++ while ($r-- > 0);
@range;
}
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