1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
|
#!/usr/bin/perl
## --------------------------------------------------------------------------
##
## Copyright 1996-2009 The NASM Authors - All Rights Reserved
## See the file AUTHORS included with the NASM distribution for
## the specific copyright holders.
##
## Redistribution and use in source and binary forms, with or without
## modification, are permitted provided that the following
## conditions are met:
##
## * Redistributions of source code must retain the above copyright
## notice, this list of conditions and the following disclaimer.
## * Redistributions in binary form must reproduce the above
## copyright notice, this list of conditions and the following
## disclaimer in the documentation and/or other materials provided
## with the distribution.
##
## THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND
## CONTRIBUTORS "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES,
## INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF
## MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
## DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR
## CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
## SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
## NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
## LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
## HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
## CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR
## OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE,
## EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
##
## --------------------------------------------------------------------------
#
# Generate a perfect hash for directive parsing
#
# Usage: directives.pl directives.dat directives.c directives.h
#
require 'phash.ph';
my($output, $directives_dat, $outfile) = @ARGV;
@directives = ();
@specials = ('none', 'unknown');
open(DD, "< ${directives_dat}\0")
or die "$0: cannot open: ${directives_dat}: $!\n";
while (defined($line = <DD>)) {
chomp $line;
if ($line =~ /^\s*([[:alnum:]]+)\s*(|[\;\#].*)$/) {
push(@directives, $1);
}
}
close(DD);
if ($output eq 'h') {
open(H, "> ${outfile}\0")
or die "$0: cannot create: ${outfile}: $!\n";
print H "/*\n";
print H " * This file is generated from directives.dat\n";
print H " * by directives.pl; do not edit.\n";
print H " */\n";
print H "\n";
print H "#ifndef NASM_DIRECTIVES_H\n";
print H "#define NASM_DIRECTIVES_H\n";
print H "\n";
$c = '{';
print H "enum directives ";
foreach $d (@specials) {
print H "$c\n D_$d";
$c = ',';
}
foreach $d (@directives) {
print H "$c\n D_\U$d";
$c = ',';
}
print H "\n};\n\n";
printf H "extern const char * const directives[%d];\n",
scalar(@directives)+scalar(@specials);
print H "enum directives find_directive(const char *token);\n\n";
print H "#endif /* NASM_DIRECTIVES_H */\n";
} elsif ($output eq 'c') {
%directive = ();
$n = 0;
foreach $d (@directives) {
if (exists($directive{$d})) {
die "$0: $directives_dat: duplicate directive: $d\n";
}
$directive{$d} = $n++; # This is zero-based, unlike the enum!
}
@hashinfo = gen_perfect_hash(\%directive);
if (!defined(@hashinfo)) {
die "$0: no hash found\n";
}
# Paranoia...
verify_hash_table(\%directive, \@hashinfo);
($n, $sv, $g) = @hashinfo;
die if ($n & ($n-1));
open(C, "> ${outfile}\0")
or die "$0: cannot create: ${directives_c}: $!\n";
print C "/*\n";
print C " * This file is generated from directives.dat\n";
print C " * by directives.pl; do not edit.\n";
print C " */\n";
print C "\n";
print C "#include \"compiler.h\"\n";
print C "#include <string.h>\n";
print C "#include \"nasm.h\"\n";
print C "#include \"hashtbl.h\"\n";
print C "#include \"directives.h\"\n";
print C "\n";
printf C "const char * const directives[%d] = \n",
scalar(@directives)+scalar(@specials);
$c = '{';
foreach $d (@specials) {
print C "$c\n NULL";
$c = ',';
}
foreach $d (@directives) {
print C "$c\n \"$d\"";
$c = ',';
}
print C "\n};\n\n";
print C "enum directives find_directive(const char *token)\n";
print C "{\n";
# Put a large value in unused slots. This makes it extremely unlikely
# that any combination that involves unused slot will pass the range test.
# This speeds up rejection of unrecognized tokens, i.e. identifiers.
print C "#define UNUSED 16383\n";
print C " static const int16_t hash1[$n] = {\n";
for ($i = 0; $i < $n; $i++) {
my $h = ${$g}[$i*2+0];
print C " ", defined($h) ? $h : 'UNUSED', ",\n";
}
print C " };\n";
print C " static const int16_t hash2[$n] = {\n";
for ($i = 0; $i < $n; $i++) {
my $h = ${$g}[$i*2+1];
print C " ", defined($h) ? $h : 'UNUSED', ",\n";
}
print C " };\n";
print C " uint32_t k1, k2;\n";
print C " uint64_t crc;\n";
# For correct overflow behavior, "ix" should be unsigned of the same
# width as the hash arrays.
print C " uint16_t ix;\n";
print C "\n";
printf C " crc = crc64i(UINT64_C(0x%08x%08x), token);\n",
$$sv[0], $$sv[1];
print C " k1 = (uint32_t)crc;\n";
print C " k2 = (uint32_t)(crc >> 32);\n";
print C "\n";
printf C " ix = hash1[k1 & 0x%x] + hash2[k2 & 0x%x];\n", $n-1, $n-1;
printf C " if (ix >= %d)\n", scalar(@directives);
print C " return D_unknown;\n";
print C "\n";
printf C " ix += %d;\n", scalar(@specials);
print C " if (nasm_stricmp(token, directives[ix]))\n";
print C " return D_unknown;\n";
print C "\n";
print C " return ix;\n";
print C "}\n";
}
|
