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/*
* Copyright (c) 2015-2017, Intel Corporation
*
* 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.
* * Neither the name of Intel Corporation nor the names of its contributors
* may be used to endorse or promote products derived from this software
* without specific prior written permission.
*
* 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.
*/
/** \file
* \brief Truffle compiler
*
* truffle is always able to represent an entire character class, providing a
* backstop to other acceleration engines.
*/
#include "trufflecompile.h"
#include "ue2common.h"
#include "util/charreach.h"
#include "util/dump_mask.h"
#include "util/simd_types.h"
#include <cstring>
using namespace std;
namespace ue2 {
/*
* To represent an entire charclass (256 chars), truffle uses two 128 bit
* masks - the first is for chars that do not have the high bit/bit 7 set,
* i.e. chars {0..127}. The second mask is for chars with bit 7 set.
*
* Each char to be represented is split into the low nibble (bits {0..3}) and
* bits {4,5,6} - the low nibble is the offset into the mask and the value of
* bits 456 is the bit that is set at that offset.
*/
void truffleBuildMasks(const CharReach &cr, u8 *shuf_mask_lo_highclear,
u8 *shuf_mask_lo_highset) {
memset(shuf_mask_lo_highset, 0, sizeof(m128));
memset(shuf_mask_lo_highclear, 0, sizeof(m128));
for (size_t v = cr.find_first(); v != CharReach::npos;
v = cr.find_next(v)) {
DEBUG_PRINTF("adding 0x%02x to %s\n", (u8)v, (v & 0x80) ? "highset" : "highclear");
u8 *change_mask = (v & 0x80) ? shuf_mask_lo_highset : shuf_mask_lo_highclear;
u8 low_nibble = v & 0xf;
u8 bits_456 = (v & 0x70) >> 4;
change_mask[low_nibble] |= 1 << bits_456;
}
}
/*
* Reconstruct the charclass that the truffle masks represent
*/
CharReach truffle2cr(const u8 *highclear, const u8 *highset) {
CharReach cr;
for (u8 i = 0; i < 16; i++) {
u32 bits_456 = highclear[i];
while (bits_456) {
u32 pos = findAndClearLSB_32(&bits_456);
assert(pos < 8);
cr.set(pos << 4 | i);
}
bits_456 = highset[i];
while (bits_456) {
u32 pos = findAndClearLSB_32(&bits_456);
assert(pos < 8);
cr.set(0x80 | pos << 4 | i);
}
}
return cr;
}
} // namespc
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