mirror of
https://github.com/netwide-assembler/nasm.git
synced 2024-12-21 09:19:31 +08:00
d235408c65
Enough users expect the namespace starting with underscore to be safe for symbols. Change our private namespace from __foo__ to __?foo?__. Use %defalias to provide backwards compatiblity (by using %defalias instead of %define, we handle the case properly where the user changes the value.) Add a preprocessor directive: %aliases off ... to disable all smacro aliases and thereby making the namespace clean. Finally, fix infinite recursion when seeing %? or %?? due to paste_tokens(). If we don't paste anything, the expansion is done. Signed-off-by: H. Peter Anvin <hpa@zytor.com>
296 lines
8.5 KiB
Perl
Executable File
296 lines
8.5 KiB
Perl
Executable File
#!/usr/bin/perl
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## --------------------------------------------------------------------------
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##
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## Copyright 1996-2018 The NASM Authors - All Rights Reserved
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## See the file AUTHORS included with the NASM distribution for
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## the specific copyright holders.
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##
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## Redistribution and use in source and binary forms, with or without
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## modification, are permitted provided that the following
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## conditions are met:
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##
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## * Redistributions of source code must retain the above copyright
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## notice, this list of conditions and the following disclaimer.
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## * Redistributions in binary form must reproduce the above
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## copyright notice, this list of conditions and the following
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## disclaimer in the documentation and/or other materials provided
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## with the distribution.
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##
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## THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND
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## CONTRIBUTORS "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES,
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## INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF
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## MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
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## DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR
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## CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
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## SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
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## NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
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## LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
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## HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
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## CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR
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## OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE,
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## EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
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##
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## --------------------------------------------------------------------------
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#
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# Generate a perfect hash for token parsing
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#
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# Usage: tokenhash.pl insns.dat regs.dat tokens.dat
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#
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require 'phash.ph';
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my($output, $insns_dat, $regs_dat, $tokens_dat) = @ARGV;
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%tokens = ();
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@tokendata = ();
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#
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# List of condition codes
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#
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@conditions = ('a', 'ae', 'b', 'be', 'c', 'e', 'g', 'ge', 'l', 'le',
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'na', 'nae', 'nb', 'nbe', 'nc', 'ne', 'ng', 'nge', 'nl',
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'nle', 'no', 'np', 'ns', 'nz', 'o', 'p', 'pe', 'po', 's', 'z');
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#
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# Read insns.dat
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#
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open(ID, '<', $insns_dat) or die "$0: cannot open $insns_dat: $!\n";
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while (defined($line = <ID>)) {
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if ($line =~ /^([\?\@A-Z0-9_]+)(|cc)\s/) {
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$insn = $1.$2;
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($token = $1) =~ tr/A-Z/a-z/;
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if ($2 eq '') {
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# Single instruction token
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if (!defined($tokens{$token})) {
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$tokens{$token} = scalar @tokendata;
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push(@tokendata, "\"${token}\", ".length($token).
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", TOKEN_INSN, C_none, 0, I_${insn}");
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}
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} else {
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# Conditional instruction
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foreach $cc (@conditions) {
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my $etok = $token.$cc;
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if (!defined($tokens{$etok})) {
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$tokens{$etok} = scalar @tokendata;
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push(@tokendata, "\"${etok}\", ".length($etok).
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", TOKEN_INSN, C_\U$cc\E, 0, I_${insn}");
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}
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}
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}
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}
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}
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close(ID);
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#
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# Read regs.dat
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#
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open(RD, '<', $regs_dat) or die "$0: cannot open $regs_dat: $!\n";
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while (defined($line = <RD>)) {
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if ($line =~ /^([\?\@a-z0-9_-]+)\s*\S+\s*\S+\s*[0-9]+\s*(\S*)/) {
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$reg = $1;
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$reg_flag = $2;
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if ($reg =~ /^(.*[^0-9])([0-9]+)\-([0-9]+)(|[^0-9].*)$/) {
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$nregs = $3-$2+1;
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$reg = $1.$2.$4;
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$reg_nr = $2;
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$reg_prefix = $1;
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$reg_suffix = $4;
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} else {
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$nregs = 1;
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undef $reg_prefix;
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undef $reg_suffix;
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}
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while ($nregs--) {
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if (defined($tokens{$reg})) {
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die "Duplicate definition: $reg\n";
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}
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$tokens{$reg} = scalar @tokendata;
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$reg_flag = '0' if ($reg_flag eq '');
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push(@tokendata, "\"${reg}\", ".length($reg).", TOKEN_REG, 0, ${reg_flag}, R_\U${reg}\E");
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if (defined($reg_prefix)) {
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$reg_nr++;
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$reg = sprintf("%s%u%s", $reg_prefix, $reg_nr, $reg_suffix);
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} else {
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# Not a dashed sequence
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die if ($nregs);
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}
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}
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}
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}
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close(RD);
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#
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# Read tokens.dat
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#
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open(TD, '<', $tokens_dat) or die "$0: cannot open $tokens_dat: $!\n";
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while (defined($line = <TD>)) {
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if ($line =~ /^\%\s+(.*)$/) {
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$pattern = $1;
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} elsif ($line =~ /^([\?\@\.a-z0-9_-]+)/) {
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$token = $1;
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if (defined($tokens{$token})) {
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die "Duplicate definition: $token\n";
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}
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$tokens{$token} = scalar @tokendata;
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$data = $pattern;
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if ($data =~ /^(.*)\{(.*)\}(.*)$/) {
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my $head = $1, $tail = $3;
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my $px = $2;
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$px =~ s/\?/\\?/g;
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$px =~ s/\*/(.*)/g;
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if ($token =~ /$px/i) {
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$data = $head."\U$1".$tail;
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} else {
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die "$0: token $token doesn't match $px\n";
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}
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}
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$data =~ s/\*/\U$token/g;
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$data =~ s/\?//g;
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push(@tokendata, "\"$token\", ".length($token).", $data");
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}
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}
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close(TD);
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$max_len = 0;
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foreach $token (keys(%tokens)) {
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if (length($token) > $max_len) {
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$max_len = length($token);
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}
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}
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if ($output eq 'h') {
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#
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# tokens.h
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#
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print "/*\n";
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print " * This file is generated from insns.dat, regs.dat and token.dat\n";
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print " * by tokhash.pl; do not edit.\n";
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print " */\n";
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print "\n";
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print "#ifndef NASM_TOKENS_H\n";
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print "#define NASM_TOKENS_H\n";
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print "\n";
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print "#define MAX_KEYWORD $max_len /* length of longest keyword */\n";
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print "\n";
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print "#endif /* NASM_TOKENS_H */\n";
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} elsif ($output eq 'c') {
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#
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# tokhash.c
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#
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@hashinfo = gen_perfect_hash(\%tokens);
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if (!@hashinfo) {
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die "$0: no hash found\n";
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}
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# Paranoia...
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verify_hash_table(\%tokens, \@hashinfo);
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($n, $sv, $g) = @hashinfo;
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die if ($n & ($n-1));
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print "/*\n";
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print " * This file is generated from insns.dat, regs.dat and token.dat\n";
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print " * by tokhash.pl; do not edit.\n";
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print " */\n";
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print "\n";
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print "#include \"compiler.h\"\n";
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print "#include \"nasm.h\"\n";
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print "#include \"hashtbl.h\"\n";
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print "#include \"insns.h\"\n";
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print "#include \"stdscan.h\"\n";
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print "\n";
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# These somewhat odd sizes and ordering thereof are due to the
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# relative ranges of the types; this makes it fit in 16 bytes on
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# 64-bit machines and 12 bytes on 32-bit machines.
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print "struct tokendata {\n";
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print " const char *string;\n";
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print " uint16_t len;\n";
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print " int16_t tokentype;\n";
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print " int16_t aux;\n";
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print " uint16_t tokflag;\n";
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print " int32_t num;\n";
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print "};\n";
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print "\n";
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print "int nasm_token_hash(const char *token, struct tokenval *tv)\n";
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print "{\n";
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# Put a large value in unused slots. This makes it extremely unlikely
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# that any combination that involves unused slot will pass the range test.
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# This speeds up rejection of unrecognized tokens, i.e. identifiers.
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print "#define UNUSED (65535/3)\n";
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print " static const int16_t hash1[$n] = {\n";
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for ($i = 0; $i < $n; $i++) {
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my $h = ${$g}[$i*2+0];
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print " ", defined($h) ? $h : 'UNUSED', ",\n";
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}
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print " };\n";
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print " static const int16_t hash2[$n] = {\n";
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for ($i = 0; $i < $n; $i++) {
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my $h = ${$g}[$i*2+1];
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print " ", defined($h) ? $h : 'UNUSED', ",\n";
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}
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print " };\n";
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printf " static const struct tokendata tokendata[%d] = {\n",
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scalar(@tokendata);
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foreach $d (@tokendata) {
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print " { ", $d, " },\n";
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}
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print " };\n";
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print " uint32_t k1, k2;\n";
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print " uint64_t crc;\n";
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print " size_t len;\n";
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# For correct overflow behavior, "ix" should be unsigned of the same
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# width as the hash arrays.
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print " uint16_t ix;\n";
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print " const struct tokendata *data;\n";
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print "\n";
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print " len = strlen(token);\n";
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print " if (unlikely(len > $max_len))\n";
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print " goto notfound;\n";
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print "\n";
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printf " crc = crc64b(UINT64_C(0x%08x%08x), token, len);\n",
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$$sv[0], $$sv[1];
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print " k1 = (uint32_t)crc;\n";
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print " k2 = (uint32_t)(crc >> 32);\n";
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print "\n";
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printf " ix = hash1[k1 & 0x%x] + hash2[k2 & 0x%x];\n", $n-1, $n-1;
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printf " if (ix >= %d)\n", scalar(@tokendata);
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print " goto notfound;\n";
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print "\n";
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print " data = &tokendata[ix];\n";
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print " if (data->len != len || memcmp(data->string, token, len))\n";
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print " goto notfound;\n";
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print "\n";
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print " tv->t_integer = data->num;\n";
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print " tv->t_inttwo = data->aux;\n";
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print " tv->t_flag = data->tokflag;\n";
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print " return tv->t_type = data->tokentype;\n";
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print "\n";
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print "notfound:\n";
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print " tv->t_integer = 0;\n";
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print " tv->t_inttwo = 0;\n";
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print " tv->t_flag = 0;\n";
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print " return tv->t_type = TOKEN_ID;\n";
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print "}\n";
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}
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