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Copy pathcreate_hash_table
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executable file
·347 lines (307 loc) · 10.9 KB
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#! /usr/bin/env perl
#
# Static Hashtable Generator
#
# (c) 2000-2002 by Harri Porten <porten@kde.org> and
# David Faure <faure@kde.org>
# Modified (c) 2004 by Nikolas Zimmermann <wildfox@kde.org>
# Copyright (C) 2007-2022 Apple Inc. All rights reserved.
#
# This library is free software; you can redistribute it and/or
# modify it under the terms of the GNU Lesser General Public
# License as published by the Free Software Foundation; either
# version 2 of the License, or (at your option) any later version.
#
# This library 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
# Lesser General Public License for more details.
#
# You should have received a copy of the GNU Lesser General Public
# License along with this library; if not, write to the Free Software
# Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
#
use strict;
use warnings;
use Getopt::Long qw(:config pass_through);
my $file = shift @ARGV or die("Must provide source file as final argument.");
open(IN, $file) or die "No such file $file";
my @keys = ();
my @attrs = ();
my @values = ();
my @hashes = ();
my @table = ();
my @links = ();
my $hasSetter = "false";
my $includeBuiltin = 0;
my $inside = 0;
my $name;
my $pefectHashSize;
my $compactSize;
my $compactHashSizeMask;
my $banner = 0;
sub calcPerfectHashSize();
sub calcCompactHashSize();
sub output();
sub jsc_ucfirst($);
sub hashValue($);
while (<IN>) {
chomp;
s/^\s+//;
next if /^\#|^$/; # Comment or blank line. Do nothing.
if (/^\@begin/ && !$inside) {
if (/^\@begin\s*([:_\w]+)\s*\d*\s*$/) {
$inside = 1;
$name = $1;
} else {
print STDERR "WARNING: \@begin without table name, skipping $_\n";
}
} elsif (/^\@end\s*$/ && $inside) {
calcPerfectHashSize();
calcCompactHashSize();
output();
@keys = ();
@attrs = ();
@values = ();
@hashes = ();
@table = ();
@links = ();
$includeBuiltin = 0;
$inside = 0;
} elsif (/^(\S+)\s*(\S+)\s*([\w\|]*)\s*(\w*)\s*(\w*)\s*$/ && $inside) {
my $key = $1;
my $val = $2;
my $att = $3;
my $param = $4;
my $intrinsic = $5;
push(@keys, $key);
push(@attrs, length($att) > 0 ? $att : "None");
if ($val eq "JSBuiltin") {
$includeBuiltin = 1;
}
if ($att =~ m/Function/) {
push(@values, { "type" => "PropertyAttribute::Function", "function" => $val, "params" => (length($param) ? $param : ""), "intrinsic" => (length($intrinsic) ? $intrinsic : "NoIntrinsic") });
#printf STDERR "WARNING: Number of arguments missing for $key/$val\n" if (length($param) == 0);
} elsif ($att =~ m/CellProperty/) {
my $property = $val;
push(@values, { "type" => "PropertyAttribute::CellProperty", "property" => $property });
} elsif ($att =~ m/ClassStructure/) {
my $property = $val;
push(@values, { "type" => "PropertyAttribute::ClassStructure", "property" => $property });
} elsif ($att =~ m/PropertyCallback/) {
my $cback = $val;
push(@values, { "type" => "PropertyAttribute::PropertyCallback", "cback" => $cback });
} elsif (length($att)) {
my $get = $val;
my $put = "0";
if (!($att =~ m/ReadOnly/)) {
$put = "set" . jsc_ucfirst($val);
}
$hasSetter = "true";
push(@values, { "type" => "PropertyAttribute::Property", "get" => $get, "put" => $put });
} else {
push(@values, { "type" => "Lexer", "value" => $val });
}
push(@hashes, hashValue($key));
} elsif ($inside) {
die "invalid data {" . $_ . "}";
}
}
die "missing closing \@end" if ($inside);
sub jsc_ucfirst($)
{
my ($value) = @_;
if ($value =~ /js/) {
$value =~ s/js/JS/;
return $value;
}
return ucfirst($value);
}
sub ceilingToPowerOf2
{
my ($pefectHashSize) = @_;
my $powerOf2 = 1;
while ($pefectHashSize > $powerOf2) {
$powerOf2 <<= 1;
}
return $powerOf2;
}
sub calcPerfectHashSize()
{
tableSizeLoop:
for ($pefectHashSize = ceilingToPowerOf2(scalar @keys); ; $pefectHashSize += $pefectHashSize) {
my @table = ();
foreach my $key (@keys) {
my $h = hashValue($key) % $pefectHashSize;
next tableSizeLoop if $table[$h];
$table[$h] = 1;
}
last;
}
}
sub leftShift($$) {
my ($value, $distance) = @_;
return (($value << $distance) & 0xFFFFFFFF);
}
sub calcCompactHashSize()
{
my $compactHashSize = ceilingToPowerOf2(2 * @keys);
$compactHashSizeMask = $compactHashSize - 1;
$compactSize = $compactHashSize;
my $collisions = 0;
my $maxdepth = 0;
my $i = 0;
foreach my $key (@keys) {
my $depth = 0;
my $h = hashValue($key) % $compactHashSize;
while (defined($table[$h])) {
if (defined($links[$h])) {
$h = $links[$h];
$depth++;
} else {
$collisions++;
$links[$h] = $compactSize;
$h = $compactSize;
$compactSize++;
}
}
$table[$h] = $i;
$i++;
$maxdepth = $depth if ( $depth > $maxdepth);
}
}
# Paul Hsieh's SuperFastHash
# http://www.azillionmonkeys.com/qed/hash.html
sub hashValue($) {
my @chars = split(/ */, $_[0]);
# This hash is designed to work on 16-bit chunks at a time. But since the normal case
# (above) is to hash UTF-16 characters, we just treat the 8-bit chars as if they
# were 16-bit chunks, which should give matching results
my $EXP2_32 = 4294967296;
my $hash = 0x9e3779b9;
my $l = scalar @chars; #I wish this was in Ruby --- Maks
my $rem = $l & 1;
$l = $l >> 1;
my $s = 0;
# Main loop
for (; $l > 0; $l--) {
$hash += ord($chars[$s]);
my $tmp = leftShift(ord($chars[$s+1]), 11) ^ $hash;
$hash = (leftShift($hash, 16)% $EXP2_32) ^ $tmp;
$s += 2;
$hash += $hash >> 11;
$hash %= $EXP2_32;
}
# Handle end case
if ($rem != 0) {
$hash += ord($chars[$s]);
$hash ^= (leftShift($hash, 11)% $EXP2_32);
$hash += $hash >> 17;
}
# Force "avalanching" of final 127 bits
$hash ^= leftShift($hash, 3);
$hash += ($hash >> 5);
$hash = ($hash% $EXP2_32);
$hash ^= (leftShift($hash, 2)% $EXP2_32);
$hash += ($hash >> 15);
$hash = $hash% $EXP2_32;
$hash ^= (leftShift($hash, 10)% $EXP2_32);
# Save 8 bits for StringImpl to use as flags.
$hash &= 0xffffff;
# This avoids ever returning a hash code of 0, since that is used to
# signal "hash not computed yet". Setting the high bit maintains
# reasonable fidelity to a hash code of 0 because it is likely to yield
# exactly 0 when hash lookup masks out the high bits.
$hash = (0x80000000 >> 8) if ($hash == 0);
return $hash;
}
sub output() {
if (!$banner) {
$banner = 1;
print "// Automatically generated from $file using $0. DO NOT EDIT!\n";
}
my $nameEntries = "${name}Values";
$nameEntries =~ s/:/_/g;
my $nameIndex = "${name}Index";
$nameIndex =~ s/:/_/g;
print "\n";
print "#include \"JSCBuiltins.h\"\n" if ($includeBuiltin);
print "#include \"Lookup.h\"\n";
print "\n";
print "namespace JSC {\n";
print "\n";
if ($compactSize != 0) {
print "static const struct CompactHashIndex ${nameIndex}\[$compactSize\] = {\n";
for (my $i = 0; $i < $compactSize; $i++) {
my $T = -1;
if (defined($table[$i])) { $T = $table[$i]; }
my $L = -1;
if (defined($links[$i])) { $L = $links[$i]; }
print " { $T, $L },\n";
}
} else {
# MSVC dislikes empty arrays.
print "static const struct CompactHashIndex ${nameIndex}\[1\] = {\n";
print " { 0, 0 }\n";
}
print "};\n";
print "\n";
my $packedSize = scalar @keys;
if ($packedSize != 0) {
print "static const struct HashTableValue ${nameEntries}\[$packedSize\] = {\n";
} else {
# MSVC dislikes empty arrays.
print "static const struct HashTableValue ${nameEntries}\[1\] = {\n";
print " { { }, 0, NoIntrinsic, { HashTableValue::End } }\n";
}
my $i = 0;
foreach my $key (@keys) {
my $typeTag = "";
my $firstValue = "";
my $secondValue = "";
my $hasSecondValue = 1;
my $intrinsic = "NoIntrinsic";
if ($values[$i]{"type"} eq "PropertyAttribute::Function") {
$typeTag = "NativeFunction";
$firstValue = $values[$i]{"function"};
$secondValue = $values[$i]{"params"};
$intrinsic = $values[$i]{"intrinsic"};
} elsif ($values[$i]{"type"} eq "PropertyAttribute::Property") {
$typeTag = "GetterSetter";
$firstValue = $values[$i]{"get"};
$secondValue = $values[$i]{"put"};
} elsif ($values[$i]{"type"} eq "Lexer") {
$typeTag = "Lexer";
$firstValue = $values[$i]{"value"};
$hasSecondValue = 0;
} elsif ($values[$i]{"type"} eq "PropertyAttribute::CellProperty" || $values[$i]{"type"} eq "PropertyAttribute::ClassStructure") {
$typeTag = ($values[$i]{"type"} eq "PropertyAttribute::CellProperty") ? "LazyCellProperty" : "LazyClassStructure";
$values[$i]{"property"} =~ /\A([a-zA-Z0-9_]+)::(.*)\Z/ or die;
$firstValue = "OBJECT_OFFSETOF($1, $2)";
$hasSecondValue = 0;
} elsif ($values[$i]{"type"} eq "PropertyAttribute::PropertyCallback") {
$typeTag = "LazyProperty";
$firstValue = $values[$i]{"cback"};
$hasSecondValue = 0;
}
my $attributes = "PropertyAttribute::" . $attrs[$i];
$attributes =~ s/\|/\|PropertyAttribute::/g;
$attributes = "static_cast<unsigned>(" . $attributes . ")";
if ($values[$i]{"type"} eq "PropertyAttribute::Function" && $firstValue eq "JSBuiltin") {
$typeTag = "BuiltinGenerator";
my $tableHead = $name;
$tableHead =~ s/Table$//;
print " { \"$key\"_s, (($attributes) & ~PropertyAttribute::Function) | PropertyAttribute::Builtin, $intrinsic, { HashTableValue::" . $typeTag . "Type, " . $tableHead . ucfirst($key) . "CodeGenerator, $secondValue } },\n";
}
else {
print " { \"$key\"_s, $attributes, $intrinsic, { HashTableValue::" . $typeTag . "Type, $firstValue" . ($hasSecondValue ? ", " . $secondValue : "") . " } },\n";
}
$i++;
}
print "};\n";
print "\n";
print "static const struct HashTable $name =\n";
print " \{ $packedSize, $compactHashSizeMask, $hasSetter, nullptr, $nameEntries, $nameIndex \};\n";
print "\n";
print "} // namespace JSC\n";
}