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phash: simplify the code generators

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Simplify the code generators by merging the two hash constant arrays
into one. The hash is effectively the same, although the order of the
constants differ (possibly in a way which makes the indexing easier.)
The main difference is the amount of code is necessary to generate
each of the output C files.

Signed-off-by: H. Peter Anvin (Intel) <hpa@zytor.com>
This commit is contained in:
H. Peter Anvin (Intel) 2020-07-10 19:26:52 -07:00
parent 10c9aa37a4
commit b14dbb95a1
6 changed files with 76 additions and 95 deletions
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112
asm/pptok.pl
View File

@ -1,7 +1,7 @@
#!/usr/bin/perl
## --------------------------------------------------------------------------
##
## Copyright 1996-2019 The NASM Authors - All Rights Reserved
## Copyright 1996-2020 The NASM Authors - All Rights Reserved
## See the file AUTHORS included with the NASM distribution for
## the specific copyright holders.
##
@ -168,6 +168,36 @@ if ($what eq 'c') {
print OUT "/* Do not edit */\n";
print OUT "\n";
print OUT "#include \"compiler.h\"\n";
print OUT "#include \"nctype.h\"\n";
print OUT "#include \"nasmlib.h\"\n";
print OUT "#include \"hashtbl.h\"\n";
print OUT "#include \"preproc.h\"\n";
print OUT "\n";
# Note that this is global.
printf OUT "const char * const pp_directives[%d] = {\n", scalar(@pptok);
foreach $d (@pptok) {
if (defined($d) && $d !~ /[A-Z]/) {
print OUT " \"%$d\",\n";
} else {
print OUT " NULL,\n";
}
}
print OUT "};\n";
printf OUT "const uint8_t pp_directives_len[%d] = {\n", scalar(@pptok);
foreach $d (@pptok) {
printf OUT " %d,\n", defined($d) ? length($d)+1 : 0;
}
print OUT "};\n";
# Put a large value in unused hash slots. This makes it extremely
# unlikely that any combination that involves unused slot will
# pass the range test. This speeds up rejection of unrecognized
# tokens, i.e. identifiers.
print OUT "\n#define INVALID_HASH_ENTRY (65535/3)\n";
my %tokens = ();
my @tokendata = ();
@ -196,54 +226,19 @@ if ($what eq 'c') {
($n, $sv, $g) = @hashinfo;
die if ($n & ($n-1));
$n <<= 1;
print OUT "#include \"compiler.h\"\n";
print OUT "#include \"nctype.h\"\n";
print OUT "#include \"nasmlib.h\"\n";
print OUT "#include \"hashtbl.h\"\n";
print OUT "#include \"preproc.h\"\n";
print OUT "\n";
# Note that this is global.
printf OUT "const char * const pp_directives[%d] = {\n", scalar(@pptok);
foreach $d (@pptok) {
if (defined($d) && $d !~ /[A-Z]/) {
print OUT " \"%$d\",\n";
} else {
print OUT " NULL,\n";
}
}
print OUT "};\n";
printf OUT "const uint8_t pp_directives_len[%d] = {\n", scalar(@pptok);
foreach $d (@pptok) {
printf OUT " %d,\n", defined($d) ? length($d)+1 : 0;
}
print OUT "};\n";
# Put a large value in unused slots. This makes it extremely unlikely
# that any combination that involves unused slot will pass the range test.
# This speeds up rejection of unrecognized tokens, i.e. identifiers.
print OUT "\n#define INVALID_HASH_ENTRY (65535/3)\n";
print OUT "\n\n/* Primary preprocessor token hash */\n\n";
print OUT "enum preproc_token pp_token_hash(const char *token)\n";
print OUT "{\n";
print OUT " static const int16_t hash1[$n] = {\n";
print OUT " static const int16_t hashdata[$n] = {\n";
for ($i = 0; $i < $n; $i++) {
my $h = ${$g}[$i*2+0];
my $h = ${$g}[$i];
print OUT " ", defined($h) ? $h : 'INVALID_HASH_ENTRY', ",\n";
}
print OUT " };\n";
print OUT " static const int16_t hash2[$n] = {\n";
for ($i = 0; $i < $n; $i++) {
my $h = ${$g}[$i*2+1];
print OUT " ", defined($h) ? $h : 'INVALID_HASH_ENTRY', ",\n";
}
print OUT " };\n";
print OUT " uint32_t k1, k2;\n";
print OUT " uint64_t crc;\n";
# For correct overflow behavior, "ix" should be unsigned of the same
@ -253,10 +248,10 @@ if ($what eq 'c') {
printf OUT " crc = crc64i(UINT64_C(0x%08x%08x), token);\n",
$$sv[0], $$sv[1];
print OUT " k1 = (uint32_t)crc;\n";
print OUT " k2 = (uint32_t)(crc >> 32);\n";
printf OUT " k1 = ((uint32_t)crc & 0x%x) + 0;\n", $n-2;
printf OUT " k2 = ((uint32_t)(crc >> 32) & 0x%x) + 1;\n", $n-2;
print OUT "\n";
printf OUT " ix = hash1[k1 & 0x%x] + hash2[k2 & 0x%x];\n", $n-1, $n-1;
print OUT " ix = hashdata[k1] + hashdata[k2];\n";
printf OUT " if (ix >= %d)\n", scalar(@pptok);
print OUT " return PP_INVALID;\n";
print OUT "\n";
@ -288,25 +283,18 @@ if ($what eq 'c') {
($n, $sv, $g) = @hashinfo;
die if ($n & ($n-1));
$n <<= 1;
print OUT "\n\n/* TASM compatibility preprocessor token hash */\n";
print OUT "enum preproc_token pp_tasm_token_hash(const char *token)\n";
print OUT "{\n";
print OUT " static const int16_t hash1[$n] = {\n";
print OUT " static const int16_t hashdata[$n] = {\n";
for ($i = 0; $i < $n; $i++) {
my $h = ${$g}[$i*2+0];
my $h = ${$g}[$i];
print OUT " ", defined($h) ? $h : 'INVALID_HASH_ENTRY', ",\n";
}
print OUT " };\n";
print OUT " static const int16_t hash2[$n] = {\n";
for ($i = 0; $i < $n; $i++) {
my $h = ${$g}[$i*2+1];
print OUT " ", defined($h) ? $h : 'INVALID_HASH_ENTRY', ",\n";
}
print OUT " };\n";
print OUT " uint32_t k1, k2;\n";
print OUT " uint64_t crc;\n";
# For correct overflow behavior, "ix" should be unsigned of the same
@ -316,10 +304,12 @@ if ($what eq 'c') {
printf OUT " crc = crc64i(UINT64_C(0x%08x%08x), token);\n",
$$sv[0], $$sv[1];
print OUT " k1 = (uint32_t)crc;\n";
print OUT " k2 = (uint32_t)(crc >> 32);\n";
printf OUT " k1 = ((uint32_t)crc & 0x%x) + 0;\n", $n-2;
printf OUT " k2 = ((uint32_t)(crc >> 32) & 0x%x) + 1;\n", $n-2;
print OUT "\n";
printf OUT " ix = hash1[k1 & 0x%x] + hash2[k2 & 0x%x];\n", $n-1, $n-1;
printf OUT " ix = hashdata[k1] + hashdata[k2];\n", $n-1, $n-1;
# Comparing to pptok here is correct, because this hash produces
# an enum preproc_token value directly.
printf OUT " if (ix >= %d)\n", scalar(@pptok);
print OUT " return PP_INVALID;\n";
print OUT "\n";
@ -337,9 +327,8 @@ if ($what eq 'c') {
if ($what eq 'ph') {
print OUT "# Automatically generated from $in by $0\n";
print OUT "# Do not edit\n";
print OUT "\n";
print OUT "%pptok_hash = (\n";
print OUT "\n\%pptok_hash = (\n";
$n = 0;
foreach $tok (@pptok) {
if (defined($tok)) {
@ -348,5 +337,12 @@ if ($what eq 'ph') {
$n++;
}
print OUT ");\n";
print OUT "1;\n";
print OUT "\n\@pptok_list = (\n";
foreach $tok (@pptok) {
print OUT " ", (defined($tok) ? "'\%$tok'" : 'undef'), ",\n";
}
print OUT ");\n";
print OUT "\n1;\n";
}

21
asm/tokhash.pl
View File

@ -1,7 +1,7 @@
#!/usr/bin/perl
## --------------------------------------------------------------------------
##
## Copyright 1996-2018 The NASM Authors - All Rights Reserved
## Copyright 1996-2020 The NASM Authors - All Rights Reserved
## See the file AUTHORS included with the NASM distribution for
## the specific copyright holders.
##
@ -201,6 +201,7 @@ if ($output eq 'h') {
($n, $sv, $g) = @hashinfo;
die if ($n & ($n-1));
$n <<= 1;
print "/*\n";
print " * This file is generated from insns.dat, regs.dat and token.dat\n";
@ -236,16 +237,9 @@ if ($output eq 'h') {
# This speeds up rejection of unrecognized tokens, i.e. identifiers.
print "#define INVALID_HASH_ENTRY (65535/3)\n";
print " static const int16_t hash1[$n] = {\n";
printf " static const int16_t hashdata[%d] = {\n", $n;
for ($i = 0; $i < $n; $i++) {
my $h = ${$g}[$i*2+0];
print " ", defined($h) ? $h : 'INVALID_HASH_ENTRY', ",\n";
}
print " };\n";
print " static const int16_t hash2[$n] = {\n";
for ($i = 0; $i < $n; $i++) {
my $h = ${$g}[$i*2+1];
my $h = ${$g}[$i];
print " ", defined($h) ? $h : 'INVALID_HASH_ENTRY', ",\n";
}
print " };\n";
@ -275,10 +269,11 @@ if ($output eq 'h') {
print " crc = crc64_byte(crc, c);\n";
print " };\n";
print "\n";
print " k1 = (uint32_t)crc;\n";
print " k2 = (uint32_t)(crc >> 32);\n";
printf " k1 = ((uint32_t)crc & 0x%x) + 0;\n", $n-2;
printf " k2 = ((uint32_t)(crc >> 32) & 0x%x) + 1;\n", $n-2;
print "\n";
printf " ix = hash1[k1 & 0x%x] + hash2[k2 & 0x%x];\n", $n-1, $n-1;
printf " ix = hashdata[k1] + hashdata[k2];\n",
$n-2, $n-2;
printf " if (ix >= %d)\n", scalar(@tokendata);
print " goto notfound;\n";
print "\n";

18
macros/macros.pl
View File

@ -260,6 +260,7 @@ if (!@hashinfo) {
verify_hash_table(\%pkg_number, \@hashinfo);
my ($n, $sv, $g) = @hashinfo;
die if ($n & ($n-1));
$n <<= 1;
printf OUT "const int use_package_count = %d;\n\n", $npkg;
@ -278,16 +279,9 @@ print OUT " };\n";
# This speeds up rejection of unrecognized tokens, i.e. identifiers.
print OUT "#define INVALID_HASH_ENTRY (65535/3)\n";
print OUT " static const int16_t hash1[$n] = {\n";
print OUT " static const int16_t hashdata[$n] = {\n";
for ($i = 0; $i < $n; $i++) {
my $h = ${$g}[$i*2+0];
print OUT " ", defined($h) ? $h : 'INVALID_HASH_ENTRY', ",\n";
}
print OUT " };\n";
print OUT " static const int16_t hash2[$n] = {\n";
for ($i = 0; $i < $n; $i++) {
my $h = ${$g}[$i*2+1];
my $h = ${$g}[$i];
print OUT " ", defined($h) ? $h : 'INVALID_HASH_ENTRY', ",\n";
}
print OUT " };\n";
@ -301,10 +295,10 @@ print OUT "\n";
printf OUT " crc = crc64i(UINT64_C(0x%08x%08x), name);\n",
$$sv[0], $$sv[1];
print OUT " k1 = (uint32_t)crc;\n";
print OUT " k2 = (uint32_t)(crc >> 32);\n";
printf OUT " k1 = ((uint32_t)crc & 0x%x) + 0;\n", $n-2;
printf OUT " k2 = ((uint32_t)(crc >> 32) & 0x%x) + 1;\n", $n-2;
print OUT "\n";
printf OUT " ix = hash1[k1 & 0x%x] + hash2[k2 & 0x%x];\n", $n-1, $n-1;
printf OUT " ix = hashdata[k1] + hashdata[k2];\n";
printf OUT " if (ix >= %d)\n", scalar(@pkg_list);
print OUT " return NULL;\n";
print OUT "\n";

4
nasmlib/perfhash.c
View File

@ -42,9 +42,9 @@ int perfhash_find(const struct perfect_hash *hash, const char *str)
crc = crc64i(hash->crcinit, str);
k1 = (uint32_t)crc & hash->hashmask;
k2 = (uint32_t)(crc >> 32) & hash->hashmask;
k2 = ((uint32_t)(crc >> 32) & hash->hashmask) + 1;
ix = hash->hashvals[k1] + hash->hashvals[k2 + hash->hashmask + 1];
ix = hash->hashvals[k1] + hash->hashvals[k2];
if (ix >= hash->tbllen ||
!hash->strings[ix] ||

11
nasmlib/perfhash.pl
View File

@ -338,13 +338,8 @@ if ($output eq 'h') {
printf F "static const int16_t %s_hashvals[%d] = ", $name, $n*2;
$c = '{';
for (my $i = 0; $i < $n; $i++) {
my $h = ${$g}[$i*2+0];
print F "$c\n ", defined($h) ? $h : 'INVALID_HASH_ENTRY';
$c = ',';
}
for (my $i = 0; $i < $n; $i++) {
my $h = ${$g}[$i*2+1];
for (my $i = 0; $i < $n*2; $i++) {
my $h = ${$g}[$i];
print F "$c\n ", defined($h) ? $h : 'INVALID_HASH_ENTRY';
$c = ',';
}
@ -352,7 +347,7 @@ if ($output eq 'h') {
print F "const struct perfect_hash ${name}_hash = {\n";
printf F " UINT64_C(0x%08x%08x),\n", $$sv[0], $$sv[1]; # crcinit
printf F " UINT32_C(0x%x),\n", $n-1; # hashmask
printf F " UINT32_C(0x%x),\n", ($n-1) << 1; # hashmask
printf F " UINT32_C(%u),\n", $tbllen; # tbllen
printf F " %d,\n", $tbloffs; # tbloffs
printf F " (%s),\n", $errval; # errval

5
perllib/phash.ph
View File

@ -15,10 +15,11 @@ require 'crc64.ph';
sub prehash($$$) {
my($key, $n, $sv) = @_;
my @c = crc64($sv, $key);
my $nmask = ($n << 1) - 2;
# Create a bipartite graph...
$k1 = (($c[1] & ($n-1)) << 1) + 0; # low word
$k2 = (($c[0] & ($n-1)) << 1) + 1; # high word
$k1 = ($c[1] & $nmask) + 0; # low word
$k2 = ($c[0] & $nmask) + 1; # high word
return ($k1, $k2);
}