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vectorscan/src/nfa/mcclellan.c
Konstantinos Margaritis d3ff893871 prefetch works best when addresses are 64-byte aligned
2021-10-12 11:50:32 +03:00

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/*
* Copyright (c) 2015-2018, 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.
*/
#include "mcclellan.h"
#include "accel.h"
#include "mcclellan_internal.h"
#include "nfa_api.h"
#include "nfa_api_queue.h"
#include "nfa_internal.h"
#include "util/bitutils.h"
#include "util/compare.h"
#include "util/simd_utils.h"
#include "ue2common.h"
#include "mcclellan_common_impl.h"
static really_inline
char doComplexReport(NfaCallback cb, void *ctxt, const struct mcclellan *m,
u32 s, u64a loc, char eod, u32 *cached_accept_state,
u32 *cached_accept_id) {
DEBUG_PRINTF("reporting state = %u, loc=%llu, eod %hhu\n",
s & STATE_MASK, loc, eod);
if (!eod && s == *cached_accept_state) {
if (cb(0, loc, *cached_accept_id, ctxt) == MO_HALT_MATCHING) {
return MO_HALT_MATCHING; /* termination requested */
}
return MO_CONTINUE_MATCHING; /* continue execution */
}
const struct mstate_aux *aux = get_aux(m, s);
size_t offset = eod ? aux->accept_eod : aux->accept;
assert(offset);
const struct report_list *rl
= (const void *)((const char *)m + offset - sizeof(struct NFA));
assert(ISALIGNED(rl));
DEBUG_PRINTF("report list size %u\n", rl->count);
u32 count = rl->count;
if (!eod && count == 1) {
*cached_accept_state = s;
*cached_accept_id = rl->report[0];
DEBUG_PRINTF("reporting %u\n", rl->report[0]);
if (cb(0, loc, rl->report[0], ctxt) == MO_HALT_MATCHING) {
return MO_HALT_MATCHING; /* termination requested */
}
return MO_CONTINUE_MATCHING; /* continue execution */
}
for (u32 i = 0; i < count; i++) {
DEBUG_PRINTF("reporting %u\n", rl->report[i]);
if (cb(0, loc, rl->report[i], ctxt) == MO_HALT_MATCHING) {
return MO_HALT_MATCHING; /* termination requested */
}
}
return MO_CONTINUE_MATCHING; /* continue execution */
}
static really_inline
const u8 *run_mcclellan_accel(const struct mcclellan *m,
const struct mstate_aux *aux, u32 s,
const u8 **min_accel_offset,
const u8 *c, const u8 *c_end) {
DEBUG_PRINTF("skipping\n");
u32 accel_offset = aux[s].accel_offset;
assert(aux[s].accel_offset);
assert(accel_offset >= m->aux_offset);
assert(!m->sherman_offset || accel_offset < m->sherman_offset);
const union AccelAux *aaux = (const void *)((const char *)m + accel_offset);
const u8 *c2 = run_accel(aaux, c, c_end);
if (c2 < *min_accel_offset + BAD_ACCEL_DIST) {
*min_accel_offset = c2 + BIG_ACCEL_PENALTY;
} else {
*min_accel_offset = c2 + SMALL_ACCEL_PENALTY;
}
if (*min_accel_offset >= c_end - ACCEL_MIN_LEN) {
*min_accel_offset = c_end;
}
DEBUG_PRINTF("advanced %zd, next accel chance in %zd/%zd\n",
c2 - c, *min_accel_offset - c2, c_end - c2);
return c2;
}
static really_inline
u32 doNormal16(const struct mcclellan *m, const u8 **c_inout, const u8 *end,
u32 s, char do_accel, enum MatchMode mode) {
const u8 *c = *c_inout;
const u16 *succ_table
= (const u16 *)((const char *)m + sizeof(struct mcclellan));
assert(ISALIGNED_N(succ_table, 2));
u32 sherman_base = m->sherman_limit;
const char *sherman_base_offset
= (const char *)m - sizeof(struct NFA) + m->sherman_offset;
u32 as = m->alphaShift;
s &= STATE_MASK;
while (c < end && s) {
u8 cprime = m->remap[*c];
DEBUG_PRINTF("c: %02hhx '%c' cp:%02hhx (s=%u)\n", *c,
ourisprint(*c) ? *c : '?', cprime, s);
if (s < sherman_base) {
DEBUG_PRINTF("doing normal\n");
assert(s < m->state_count);
s = succ_table[(s << as) + cprime];
} else {
const char *sherman_state
= findShermanState(m, sherman_base_offset, sherman_base, s);
DEBUG_PRINTF("doing sherman (%u)\n", s);
s = doSherman16(sherman_state, cprime, succ_table, as);
}
DEBUG_PRINTF("s: %u (%u)\n", s, s & STATE_MASK);
c++;
if (do_accel && (s & ACCEL_FLAG)) {
break;
}
if (mode != NO_MATCHES && (s & ACCEPT_FLAG)) {
break;
}
s &= STATE_MASK;
}
*c_inout = c;
return s;
}
static really_inline
u32 doNormalWide16(const struct mcclellan *m, const u8 **c_inout,
const u8 *end, u32 s, char *qstate, u16 *offset,
char do_accel, enum MatchMode mode) {
const u8 *c = *c_inout;
u32 wide_limit = m->wide_limit;
const char *wide_base
= (const char *)m - sizeof(struct NFA) + m->wide_offset;
const u16 *succ_table
= (const u16 *)((const char *)m + sizeof(struct mcclellan));
assert(ISALIGNED_N(succ_table, 2));
u32 sherman_base = m->sherman_limit;
const char *sherman_base_offset
= (const char *)m - sizeof(struct NFA) + m->sherman_offset;
u32 as = m->alphaShift;
s &= STATE_MASK;
while (c < end && s) {
u8 cprime = m->remap[*c];
DEBUG_PRINTF("c: %02hhx '%c' cp:%02hhx (s=%u) &c: %p\n", *c,
ourisprint(*c) ? *c : '?', cprime, s, c);
if (unlikely(s >= wide_limit)) {
const char *wide_entry
= findWideEntry16(m, wide_base, wide_limit, s);
DEBUG_PRINTF("doing wide head (%u)\n", s);
s = doWide16(wide_entry, &c, end, m->remap, (u16 *)&s, qstate,
offset);
} else if (s >= sherman_base) {
const char *sherman_state
= findShermanState(m, sherman_base_offset, sherman_base, s);
DEBUG_PRINTF("doing sherman (%u)\n", s);
s = doSherman16(sherman_state, cprime, succ_table, as);
} else {
DEBUG_PRINTF("doing normal\n");
s = succ_table[(s << as) + cprime];
}
DEBUG_PRINTF("s: %u (%u)\n", s, s & STATE_MASK);
c++;
if (do_accel && (s & ACCEL_FLAG)) {
break;
}
if (mode != NO_MATCHES && (s & ACCEPT_FLAG)) {
break;
}
s &= STATE_MASK;
}
*c_inout = c;
return s;
}
static really_inline
char mcclellanExec16_i(const struct mcclellan *m, u32 *state, char *qstate,
const u8 *buf, size_t len, u64a offAdj, NfaCallback cb,
void *ctxt, char single, const u8 **c_final,
enum MatchMode mode) {
assert(ISALIGNED_N(state, 2));
if (!len) {
if (mode == STOP_AT_MATCH) {
*c_final = buf;
}
return MO_ALIVE;
}
u32 s = *state;
u16 offset = 0;
const u8 *c = buf;
const u8 *c_end = buf + len;
const struct mstate_aux *aux
= (const struct mstate_aux *)((const char *)m + m->aux_offset
- sizeof(struct NFA));
s &= STATE_MASK;
u32 cached_accept_id = 0;
u32 cached_accept_state = 0;
DEBUG_PRINTF("s: %u, len %zu\n", s, len);
const u8 *min_accel_offset = c;
if (!m->has_accel || len < ACCEL_MIN_LEN) {
min_accel_offset = c_end;
goto without_accel;
}
goto with_accel;
without_accel:
do {
assert(c < min_accel_offset);
if (!s) {
goto exit;
}
if (unlikely(m->has_wide)) {
s = doNormalWide16(m, &c, min_accel_offset, s, qstate, &offset, 0,
mode);
} else {
s = doNormal16(m, &c, min_accel_offset, s, 0, mode);
}
if (mode != NO_MATCHES && (s & ACCEPT_FLAG)) {
if (mode == STOP_AT_MATCH) {
*state = s & STATE_MASK;
*c_final = c - 1;
return MO_MATCHES_PENDING;
}
u64a loc = (c - 1) - buf + offAdj + 1;
if (single) {
DEBUG_PRINTF("reporting %u\n", m->arb_report);
if (cb(0, loc, m->arb_report, ctxt) == MO_HALT_MATCHING) {
return MO_DEAD; /* termination requested */
}
} else if (doComplexReport(cb, ctxt, m, s & STATE_MASK, loc, 0,
&cached_accept_state, &cached_accept_id)
== MO_HALT_MATCHING) {
return MO_DEAD;
}
}
assert(c <= min_accel_offset);
} while (c < min_accel_offset);
s &= STATE_MASK;
if (c == c_end) {
goto exit;
} else {
goto with_accel;
}
with_accel:
do {
assert(c < c_end);
if (!s) {
goto exit;
}
if (s & ACCEL_FLAG) {
DEBUG_PRINTF("skipping\n");
s &= STATE_MASK;
c = run_mcclellan_accel(m, aux, s, &min_accel_offset, c, c_end);
if (c == c_end) {
goto exit;
} else {
goto without_accel;
}
}
if (unlikely(m->has_wide)) {
s = doNormalWide16(m, &c, c_end, s, qstate, &offset, 1, mode);
} else {
s = doNormal16(m, &c, c_end, s, 1, mode);
}
if (mode != NO_MATCHES && (s & ACCEPT_FLAG)) {
if (mode == STOP_AT_MATCH) {
*state = s & STATE_MASK;
*c_final = c - 1;
return MO_MATCHES_PENDING;
}
u64a loc = (c - 1) - buf + offAdj + 1;
if (single) {
DEBUG_PRINTF("reporting %u\n", m->arb_report);
if (cb(0, loc, m->arb_report, ctxt) == MO_HALT_MATCHING) {
return MO_DEAD; /* termination requested */
}
} else if (doComplexReport(cb, ctxt, m, s & STATE_MASK, loc, 0,
&cached_accept_state, &cached_accept_id)
== MO_HALT_MATCHING) {
return MO_DEAD;
}
}
assert(c <= c_end);
} while (c < c_end);
exit:
s &= STATE_MASK;
if (mode == STOP_AT_MATCH) {
*c_final = c_end;
}
*state = s;
return MO_ALIVE;
}
static never_inline
char mcclellanExec16_i_cb(const struct mcclellan *m, u32 *state, char *qstate,
const u8 *buf, size_t len, u64a offAdj,
NfaCallback cb, void *ctxt, char single,
const u8 **final_point) {
return mcclellanExec16_i(m, state, qstate, buf, len, offAdj, cb, ctxt,
single, final_point, CALLBACK_OUTPUT);
}
static never_inline
char mcclellanExec16_i_sam(const struct mcclellan *m, u32 *state, char *qstate,
const u8 *buf, size_t len, u64a offAdj,
NfaCallback cb, void *ctxt, char single,
const u8 **final_point) {
return mcclellanExec16_i(m, state, qstate, buf, len, offAdj, cb, ctxt,
single, final_point, STOP_AT_MATCH);
}
static never_inline
char mcclellanExec16_i_nm(const struct mcclellan *m, u32 *state, char *qstate,
const u8 *buf, size_t len, u64a offAdj,
NfaCallback cb, void *ctxt, char single,
const u8 **final_point) {
return mcclellanExec16_i(m, state, qstate, buf, len, offAdj, cb, ctxt,
single, final_point, NO_MATCHES);
}
static really_inline
char mcclellanExec16_i_ni(const struct mcclellan *m, u32 *state, char *qstate,
const u8 *buf, size_t len, u64a offAdj,
NfaCallback cb, void *ctxt, char single,
const u8 **final_point, enum MatchMode mode) {
if (mode == CALLBACK_OUTPUT) {
return mcclellanExec16_i_cb(m, state, qstate, buf, len, offAdj, cb,
ctxt, single, final_point);
} else if (mode == STOP_AT_MATCH) {
return mcclellanExec16_i_sam(m, state, qstate, buf, len, offAdj, cb,
ctxt, single, final_point);
} else {
assert(mode == NO_MATCHES);
return mcclellanExec16_i_nm(m, state, qstate, buf, len, offAdj, cb,
ctxt, single, final_point);
}
}
static really_inline
u32 doNormal8(const struct mcclellan *m, const u8 **c_inout, const u8 *end,
u32 s, char do_accel, enum MatchMode mode) {
const u8 *c = *c_inout;
u32 accel_limit = m->accel_limit_8;
u32 accept_limit = m->accept_limit_8;
const u32 as = m->alphaShift;
const u8 *succ_table = (const u8 *)((const char *)m
+ sizeof(struct mcclellan));
while (c < end && s) {
u8 cprime = m->remap[*c];
DEBUG_PRINTF("c: %02hhx '%c' cp:%02hhx\n", *c,
ourisprint(*c) ? *c : '?', cprime);
s = succ_table[(s << as) + cprime];
DEBUG_PRINTF("s: %u\n", s);
c++;
if (do_accel) {
if (s >= accel_limit) {
break;
}
} else {
if (mode != NO_MATCHES && s >= accept_limit) {
break;
}
}
}
*c_inout = c;
return s;
}
static really_inline
char mcclellanExec8_i(const struct mcclellan *m, u32 *state, const u8 *buf,
size_t len, u64a offAdj, NfaCallback cb, void *ctxt,
char single, const u8 **c_final, enum MatchMode mode) {
if (!len) {
if (mode == STOP_AT_MATCH) {
*c_final = buf;
}
return MO_ALIVE;
}
u32 s = *state;
const u8 *c = buf;
const u8 *c_end = buf + len;
const struct mstate_aux *aux
= (const struct mstate_aux *)((const char *)m + m->aux_offset
- sizeof(struct NFA));
u32 accept_limit = m->accept_limit_8;
u32 cached_accept_id = 0;
u32 cached_accept_state = 0;
DEBUG_PRINTF("accel %hu, accept %u\n", m->accel_limit_8, accept_limit);
DEBUG_PRINTF("s: %u, len %zu\n", s, len);
const u8 *min_accel_offset = c;
if (!m->has_accel || len < ACCEL_MIN_LEN) {
min_accel_offset = c_end;
goto without_accel;
}
goto with_accel;
without_accel:
do {
assert(c < min_accel_offset);
if (!s) {
goto exit;
}
s = doNormal8(m, &c, min_accel_offset, s, 0, mode);
if (mode != NO_MATCHES && s >= accept_limit) {
if (mode == STOP_AT_MATCH) {
DEBUG_PRINTF("match - pausing\n");
*state = s;
*c_final = c - 1;
return MO_MATCHES_PENDING;
}
u64a loc = (c - 1) - buf + offAdj + 1;
if (single) {
DEBUG_PRINTF("reporting %u\n", m->arb_report);
if (cb(0, loc, m->arb_report, ctxt) == MO_HALT_MATCHING) {
return MO_DEAD;
}
} else if (doComplexReport(cb, ctxt, m, s, loc, 0,
&cached_accept_state, &cached_accept_id)
== MO_HALT_MATCHING) {
return MO_DEAD;
}
}
assert(c <= min_accel_offset);
} while (c < min_accel_offset);
if (c == c_end) {
goto exit;
}
with_accel:
do {
u32 accel_limit = m->accel_limit_8;
assert(c < c_end);
if (!s) {
goto exit;
}
if (s >= accel_limit && aux[s].accel_offset) {
c = run_mcclellan_accel(m, aux, s, &min_accel_offset, c, c_end);
if (c == c_end) {
goto exit;
} else {
goto without_accel;
}
}
s = doNormal8(m, &c, c_end, s, 1, mode);
if (mode != NO_MATCHES && s >= accept_limit) {
if (mode == STOP_AT_MATCH) {
DEBUG_PRINTF("match - pausing\n");
*state = s;
*c_final = c - 1;
return MO_MATCHES_PENDING;
}
u64a loc = (c - 1) - buf + offAdj + 1;
if (single) {
DEBUG_PRINTF("reporting %u\n", m->arb_report);
if (cb(0, loc, m->arb_report, ctxt) == MO_HALT_MATCHING) {
return MO_DEAD;
}
} else if (doComplexReport(cb, ctxt, m, s, loc, 0,
&cached_accept_state, &cached_accept_id)
== MO_HALT_MATCHING) {
return MO_DEAD;
}
}
assert(c <= c_end);
} while (c < c_end);
exit:
*state = s;
if (mode == STOP_AT_MATCH) {
*c_final = c_end;
}
return MO_ALIVE;
}
static never_inline
char mcclellanExec8_i_cb(const struct mcclellan *m, u32 *state, const u8 *buf,
size_t len, u64a offAdj, NfaCallback cb, void *ctxt,
char single, const u8 **final_point) {
return mcclellanExec8_i(m, state, buf, len, offAdj, cb, ctxt, single,
final_point, CALLBACK_OUTPUT);
}
static never_inline
char mcclellanExec8_i_sam(const struct mcclellan *m, u32 *state, const u8 *buf,
size_t len, u64a offAdj, NfaCallback cb, void *ctxt,
char single, const u8 **final_point) {
return mcclellanExec8_i(m, state, buf, len, offAdj, cb, ctxt, single,
final_point, STOP_AT_MATCH);
}
static never_inline
char mcclellanExec8_i_nm(const struct mcclellan *m, u32 *state, const u8 *buf,
size_t len, u64a offAdj, NfaCallback cb, void *ctxt,
char single, const u8 **final_point) {
return mcclellanExec8_i(m, state, buf, len, offAdj, cb, ctxt, single,
final_point, NO_MATCHES);
}
static really_inline
char mcclellanExec8_i_ni(const struct mcclellan *m, u32 *state, const u8 *buf,
size_t len, u64a offAdj, NfaCallback cb, void *ctxt,
char single, const u8 **final_point,
enum MatchMode mode) {
if (mode == CALLBACK_OUTPUT) {
return mcclellanExec8_i_cb(m, state, buf, len, offAdj, cb, ctxt, single,
final_point);
} else if (mode == STOP_AT_MATCH) {
return mcclellanExec8_i_sam(m, state, buf, len, offAdj, cb, ctxt,
single, final_point);
} else {
assert(mode == NO_MATCHES);
return mcclellanExec8_i_nm(m, state, buf, len, offAdj, cb, ctxt, single,
final_point);
}
}
static really_inline
char mcclellanCheckEOD(const struct NFA *nfa, u32 s, u64a offset,
NfaCallback cb, void *ctxt) {
const struct mcclellan *m = getImplNfa(nfa);
const struct mstate_aux *aux = get_aux(m, s);
if (m->has_wide == 1 && s >= m->wide_limit) {
return MO_CONTINUE_MATCHING;
}
if (!aux->accept_eod) {
return MO_CONTINUE_MATCHING;
}
return doComplexReport(cb, ctxt, m, s, offset, 1, NULL, NULL);
}
static really_inline
char nfaExecMcClellan16_Q2i(const struct NFA *n, u64a offset, const u8 *buffer,
const u8 *hend, NfaCallback cb, void *context,
struct mq *q, char single, s64a end,
enum MatchMode mode) {
assert(n->type == MCCLELLAN_NFA_16);
const struct mcclellan *m = getImplNfa(n);
s64a sp;
assert(ISALIGNED_N(q->state, 2));
u32 s = *(u16 *)q->state;
const u8 *base = ROUNDDOWN_PTR(&m->remap[0], 64);
__builtin_prefetch(base);
__builtin_prefetch(base + 64);
__builtin_prefetch(base + 128);
__builtin_prefetch(base + 192);
if (q->report_current) {
assert(s);
assert(get_aux(m, s)->accept);
int rv;
if (single) {
DEBUG_PRINTF("reporting %u\n", m->arb_report);
rv = cb(0, q_cur_offset(q), m->arb_report, context);
} else {
u32 cached_accept_id = 0;
u32 cached_accept_state = 0;
rv = doComplexReport(cb, context, m, s, q_cur_offset(q), 0,
&cached_accept_state, &cached_accept_id);
}
q->report_current = 0;
if (rv == MO_HALT_MATCHING) {
return MO_DEAD;
}
}
sp = q_cur_loc(q);
q->cur++;
const u8 *cur_buf = sp < 0 ? hend : buffer;
assert(q->cur);
if (mode != NO_MATCHES && q->items[q->cur - 1].location > end) {
DEBUG_PRINTF("this is as far as we go\n");
q->cur--;
q->items[q->cur].type = MQE_START;
q->items[q->cur].location = end;
*(u16 *)q->state = s;
return MO_ALIVE;
}
while (1) {
assert(q->cur < q->end);
s64a ep = q->items[q->cur].location;
if (mode != NO_MATCHES) {
ep = MIN(ep, end);
}
assert(ep >= sp);
s64a local_ep = ep;
if (sp < 0) {
local_ep = MIN(0, ep);
}
/* do main buffer region */
const u8 *final_look;
char rv = mcclellanExec16_i_ni(m, &s, q->state, cur_buf + sp,
local_ep - sp, offset + sp, cb, context,
single, &final_look, mode);
if (rv == MO_DEAD) {
*(u16 *)q->state = 0;
return MO_DEAD;
}
if (mode == STOP_AT_MATCH && rv == MO_MATCHES_PENDING) {
DEBUG_PRINTF("this is as far as we go\n");
DEBUG_PRINTF("state %u final_look %zd\n", s, final_look - cur_buf);
assert(q->cur);
assert(final_look != cur_buf + local_ep);
q->cur--;
q->items[q->cur].type = MQE_START;
q->items[q->cur].location = final_look - cur_buf + 1; /* due to
* early -1 */
*(u16 *)q->state = s;
return MO_MATCHES_PENDING;
}
assert(rv == MO_ALIVE);
assert(q->cur);
if (mode != NO_MATCHES && q->items[q->cur].location > end) {
DEBUG_PRINTF("this is as far as we go\n");
q->cur--;
q->items[q->cur].type = MQE_START;
q->items[q->cur].location = end;
*(u16 *)q->state = s;
return MO_ALIVE;
}
sp = local_ep;
if (sp == 0) {
cur_buf = buffer;
}
if (sp != ep) {
continue;
}
switch (q->items[q->cur].type) {
case MQE_TOP:
assert(sp + offset || !s);
if (sp + offset == 0) {
s = m->start_anchored;
break;
}
s = mcclellanEnableStarts(m, s);
break;
case MQE_END:
*(u16 *)q->state = s;
q->cur++;
return s ? MO_ALIVE : MO_DEAD;
default:
assert(!"invalid queue event");
}
q->cur++;
}
}
static really_inline
char nfaExecMcClellan16_Bi(const struct NFA *n, u64a offset, const u8 *buffer,
size_t length, NfaCallback cb, void *context,
char single) {
assert(n->type == MCCLELLAN_NFA_16);
const struct mcclellan *m = getImplNfa(n);
u32 s = m->start_anchored;
if (mcclellanExec16_i(m, &s, NULL, buffer, length, offset, cb, context,
single, NULL, CALLBACK_OUTPUT)
== MO_DEAD) {
return s ? MO_ALIVE : MO_DEAD;
}
if (m->has_wide == 1 && s >= m->wide_limit) {
return MO_ALIVE;
}
const struct mstate_aux *aux = get_aux(m, s);
if (aux->accept_eod) {
doComplexReport(cb, context, m, s, offset + length, 1, NULL, NULL);
}
return MO_ALIVE;
}
static really_inline
char nfaExecMcClellan8_Q2i(const struct NFA *n, u64a offset, const u8 *buffer,
const u8 *hend, NfaCallback cb, void *context,
struct mq *q, char single, s64a end,
enum MatchMode mode) {
assert(n->type == MCCLELLAN_NFA_8);
const struct mcclellan *m = getImplNfa(n);
s64a sp;
u32 s = *(u8 *)q->state;
const u8 *base = ROUNDDOWN_PTR(&m->remap[0], 64);
__builtin_prefetch(base);
__builtin_prefetch(base + 64);
__builtin_prefetch(base + 128);
__builtin_prefetch(base + 192);
if (q->report_current) {
assert(s);
assert(s >= m->accept_limit_8);
int rv;
if (single) {
DEBUG_PRINTF("reporting %u\n", m->arb_report);
rv = cb(0, q_cur_offset(q), m->arb_report, context);
} else {
u32 cached_accept_id = 0;
u32 cached_accept_state = 0;
rv = doComplexReport(cb, context, m, s, q_cur_offset(q), 0,
&cached_accept_state, &cached_accept_id);
}
q->report_current = 0;
if (rv == MO_HALT_MATCHING) {
return MO_DEAD;
}
}
sp = q_cur_loc(q);
q->cur++;
const u8 *cur_buf = sp < 0 ? hend : buffer;
if (mode != NO_MATCHES && q->items[q->cur - 1].location > end) {
DEBUG_PRINTF("this is as far as we go\n");
q->cur--;
q->items[q->cur].type = MQE_START;
q->items[q->cur].location = end;
*(u8 *)q->state = s;
return MO_ALIVE;
}
while (1) {
DEBUG_PRINTF("%s @ %llu\n", q->items[q->cur].type == MQE_TOP ? "TOP" :
q->items[q->cur].type == MQE_END ? "END" : "???",
q->items[q->cur].location + offset);
assert(q->cur < q->end);
s64a ep = q->items[q->cur].location;
if (mode != NO_MATCHES) {
ep = MIN(ep, end);
}
assert(ep >= sp);
s64a local_ep = ep;
if (sp < 0) {
local_ep = MIN(0, ep);
}
const u8 *final_look;
char rv = mcclellanExec8_i_ni(m, &s, cur_buf + sp, local_ep - sp,
offset + sp, cb, context, single,
&final_look, mode);
if (rv == MO_HALT_MATCHING) {
*(u8 *)q->state = 0;
return MO_DEAD;
}
if (mode == STOP_AT_MATCH && rv == MO_MATCHES_PENDING) {
DEBUG_PRINTF("this is as far as we go\n");
DEBUG_PRINTF("state %u final_look %zd\n", s, final_look - cur_buf);
assert(q->cur);
assert(final_look != cur_buf + local_ep);
q->cur--;
q->items[q->cur].type = MQE_START;
q->items[q->cur].location = final_look - cur_buf + 1; /* due to
* early -1 */
*(u8 *)q->state = s;
return MO_MATCHES_PENDING;
}
assert(rv == MO_ALIVE);
assert(q->cur);
if (mode != NO_MATCHES && q->items[q->cur].location > end) {
DEBUG_PRINTF("this is as far as we go\n");
assert(q->cur);
q->cur--;
q->items[q->cur].type = MQE_START;
q->items[q->cur].location = end;
*(u8 *)q->state = s;
return MO_ALIVE;
}
sp = local_ep;
if (sp == 0) {
cur_buf = buffer;
}
if (sp != ep) {
continue;
}
switch (q->items[q->cur].type) {
case MQE_TOP:
assert(sp + offset || !s);
if (sp + offset == 0) {
s = (u8)m->start_anchored;
break;
}
s = mcclellanEnableStarts(m, s);
break;
case MQE_END:
*(u8 *)q->state = s;
q->cur++;
return s ? MO_ALIVE : MO_DEAD;
default:
assert(!"invalid queue event");
}
q->cur++;
}
}
static really_inline
char nfaExecMcClellan8_Bi(const struct NFA *n, u64a offset, const u8 *buffer,
size_t length, NfaCallback cb, void *context,
char single) {
assert(n->type == MCCLELLAN_NFA_8);
const struct mcclellan *m = getImplNfa(n);
u32 s = m->start_anchored;
if (mcclellanExec8_i(m, &s, buffer, length, offset, cb, context, single,
NULL, CALLBACK_OUTPUT)
== MO_DEAD) {
return MO_DEAD;
}
const struct mstate_aux *aux = get_aux(m, s);
if (aux->accept_eod) {
doComplexReport(cb, context, m, s, offset + length, 1, NULL, NULL);
}
return s ? MO_ALIVE : MO_DEAD;
}
char nfaExecMcClellan8_B(const struct NFA *n, u64a offset, const u8 *buffer,
size_t length, NfaCallback cb, void *context) {
assert(n->type == MCCLELLAN_NFA_8);
const struct mcclellan *m = getImplNfa(n);
if (m->flags & MCCLELLAN_FLAG_SINGLE) {
return nfaExecMcClellan8_Bi(n, offset, buffer, length, cb, context, 1);
} else {
return nfaExecMcClellan8_Bi(n, offset, buffer, length, cb, context, 0);
}
}
char nfaExecMcClellan8_Q(const struct NFA *n, struct mq *q, s64a end) {
u64a offset = q->offset;
const u8 *buffer = q->buffer;
NfaCallback cb = q->cb;
void *context = q->context;
assert(n->type == MCCLELLAN_NFA_8);
const struct mcclellan *m = getImplNfa(n);
const u8 *hend = q->history + q->hlength;
return nfaExecMcClellan8_Q2i(n, offset, buffer, hend, cb, context, q,
m->flags & MCCLELLAN_FLAG_SINGLE, end,
CALLBACK_OUTPUT);
}
char nfaExecMcClellan16_B(const struct NFA *n, u64a offset, const u8 *buffer,
size_t length, NfaCallback cb, void *context) {
assert(n->type == MCCLELLAN_NFA_16);
const struct mcclellan *m = getImplNfa(n);
if (m->flags & MCCLELLAN_FLAG_SINGLE) {
return nfaExecMcClellan16_Bi(n, offset, buffer, length, cb, context, 1);
} else {
return nfaExecMcClellan16_Bi(n, offset, buffer, length, cb, context, 0);
}
}
char nfaExecMcClellan16_Q(const struct NFA *n, struct mq *q, s64a end) {
u64a offset = q->offset;
const u8 *buffer = q->buffer;
NfaCallback cb = q->cb;
void *context = q->context;
assert(n->type == MCCLELLAN_NFA_16);
const struct mcclellan *m = getImplNfa(n);
const u8 *hend = q->history + q->hlength;
return nfaExecMcClellan16_Q2i(n, offset, buffer, hend, cb, context, q,
m->flags & MCCLELLAN_FLAG_SINGLE, end,
CALLBACK_OUTPUT);
}
char nfaExecMcClellan8_reportCurrent(const struct NFA *n, struct mq *q) {
const struct mcclellan *m = getImplNfa(n);
NfaCallback cb = q->cb;
void *ctxt = q->context;
u32 s = *(u8 *)q->state;
u8 single = m->flags & MCCLELLAN_FLAG_SINGLE;
u64a offset = q_cur_offset(q);
assert(q_cur_type(q) == MQE_START);
assert(s);
if (s >= m->accept_limit_8) {
if (single) {
DEBUG_PRINTF("reporting %u\n", m->arb_report);
cb(0, offset, m->arb_report, ctxt);
} else {
u32 cached_accept_id = 0;
u32 cached_accept_state = 0;
doComplexReport(cb, ctxt, m, s, offset, 0, &cached_accept_state,
&cached_accept_id);
}
}
return 0;
}
char nfaExecMcClellan16_reportCurrent(const struct NFA *n, struct mq *q) {
const struct mcclellan *m = getImplNfa(n);
NfaCallback cb = q->cb;
void *ctxt = q->context;
u32 s = *(u16 *)q->state;
const struct mstate_aux *aux = get_aux(m, s);
u8 single = m->flags & MCCLELLAN_FLAG_SINGLE;
u64a offset = q_cur_offset(q);
assert(q_cur_type(q) == MQE_START);
DEBUG_PRINTF("state %u\n", s);
assert(s);
if (aux->accept) {
if (single) {
DEBUG_PRINTF("reporting %u\n", m->arb_report);
cb(0, offset, m->arb_report, ctxt);
} else {
u32 cached_accept_id = 0;
u32 cached_accept_state = 0;
doComplexReport(cb, ctxt, m, s, offset, 0, &cached_accept_state,
&cached_accept_id);
}
}
return 0;
}
static
char mcclellanHasAccept(const struct mcclellan *m, const struct mstate_aux *aux,
ReportID report) {
assert(m && aux);
if (!aux->accept) {
return 0;
}
const struct report_list *rl = (const struct report_list *)
((const char *)m + aux->accept - sizeof(struct NFA));
assert(ISALIGNED_N(rl, 4));
DEBUG_PRINTF("report list has %u entries\n", rl->count);
for (u32 i = 0; i < rl->count; i++) {
if (rl->report[i] == report) {
return 1;
}
}
return 0;
}
char nfaExecMcClellan8_inAccept(const struct NFA *n, ReportID report,
struct mq *q) {
assert(n && q);
const struct mcclellan *m = getImplNfa(n);
u8 s = *(u8 *)q->state;
DEBUG_PRINTF("checking accepts for %hhu\n", s);
if (s < m->accept_limit_8) {
return 0;
}
return mcclellanHasAccept(m, get_aux(m, s), report);
}
char nfaExecMcClellan8_inAnyAccept(const struct NFA *n, struct mq *q) {
assert(n && q);
const struct mcclellan *m = getImplNfa(n);
u8 s = *(u8 *)q->state;
DEBUG_PRINTF("checking accepts for %hhu\n", s);
assert(s < m->accept_limit_8 || get_aux(m, s)->accept);
return s >= m->accept_limit_8;
}
char nfaExecMcClellan16_inAccept(const struct NFA *n, ReportID report,
struct mq *q) {
assert(n && q);
const struct mcclellan *m = getImplNfa(n);
u16 s = *(u16 *)q->state;
DEBUG_PRINTF("checking accepts for %hu\n", s);
return (m->has_wide == 1 && s >= m->wide_limit) ?
0 : mcclellanHasAccept(m, get_aux(m, s), report);
}
char nfaExecMcClellan16_inAnyAccept(const struct NFA *n, struct mq *q) {
assert(n && q);
const struct mcclellan *m = getImplNfa(n);
u16 s = *(u16 *)q->state;
DEBUG_PRINTF("checking accepts for %hu\n", s);
return (m->has_wide == 1 && s >= m->wide_limit) ?
0 : !!get_aux(m, s)->accept;
}
char nfaExecMcClellan8_Q2(const struct NFA *n, struct mq *q, s64a end) {
u64a offset = q->offset;
const u8 *buffer = q->buffer;
NfaCallback cb = q->cb;
void *context = q->context;
assert(n->type == MCCLELLAN_NFA_8);
const struct mcclellan *m = getImplNfa(n);
const u8 *hend = q->history + q->hlength;
return nfaExecMcClellan8_Q2i(n, offset, buffer, hend, cb, context, q,
m->flags & MCCLELLAN_FLAG_SINGLE, end,
STOP_AT_MATCH);
}
char nfaExecMcClellan16_Q2(const struct NFA *n, struct mq *q, s64a end) {
u64a offset = q->offset;
const u8 *buffer = q->buffer;
NfaCallback cb = q->cb;
void *context = q->context;
assert(n->type == MCCLELLAN_NFA_16);
const struct mcclellan *m = getImplNfa(n);
const u8 *hend = q->history + q->hlength;
return nfaExecMcClellan16_Q2i(n, offset, buffer, hend, cb, context, q,
m->flags & MCCLELLAN_FLAG_SINGLE, end,
STOP_AT_MATCH);
}
char nfaExecMcClellan8_QR(const struct NFA *n, struct mq *q, ReportID report) {
u64a offset = q->offset;
const u8 *buffer = q->buffer;
NfaCallback cb = q->cb;
void *context = q->context;
assert(n->type == MCCLELLAN_NFA_8);
const struct mcclellan *m = getImplNfa(n);
const u8 *hend = q->history + q->hlength;
char rv = nfaExecMcClellan8_Q2i(n, offset, buffer, hend, cb, context, q,
m->flags & MCCLELLAN_FLAG_SINGLE, 0 /* end */,
NO_MATCHES);
if (rv && nfaExecMcClellan8_inAccept(n, report, q)) {
return MO_MATCHES_PENDING;
} else {
return rv;
}
}
char nfaExecMcClellan16_QR(const struct NFA *n, struct mq *q, ReportID report) {
u64a offset = q->offset;
const u8 *buffer = q->buffer;
NfaCallback cb = q->cb;
void *context = q->context;
assert(n->type == MCCLELLAN_NFA_16);
const struct mcclellan *m = getImplNfa(n);
const u8 *hend = q->history + q->hlength;
char rv = nfaExecMcClellan16_Q2i(n, offset, buffer, hend, cb, context, q,
m->flags & MCCLELLAN_FLAG_SINGLE,
0 /* end */, NO_MATCHES);
if (rv && nfaExecMcClellan16_inAccept(n, report, q)) {
return MO_MATCHES_PENDING;
} else {
return rv;
}
}
char nfaExecMcClellan8_initCompressedState(const struct NFA *nfa, u64a offset,
void *state, UNUSED u8 key) {
const struct mcclellan *m = getImplNfa(nfa);
u8 s = offset ? m->start_floating : m->start_anchored;
if (s) {
*(u8 *)state = s;
return 1;
}
return 0;
}
char nfaExecMcClellan16_initCompressedState(const struct NFA *nfa, u64a offset,
void *state, UNUSED u8 key) {
const struct mcclellan *m = getImplNfa(nfa);
u16 s = offset ? m->start_floating : m->start_anchored;
// new byte
if (m->has_wide) {
unaligned_store_u16((u16 *)state + 1, 0);
}
if (s) {
unaligned_store_u16(state, s);
return 1;
}
return 0;
}
void nfaExecMcClellan8_SimpStream(const struct NFA *nfa, char *state,
const u8 *buf, char top, size_t start_off,
size_t len, NfaCallback cb, void *ctxt) {
const struct mcclellan *m = getImplNfa(nfa);
u32 s = top ? m->start_anchored : *(u8 *)state;
if (m->flags & MCCLELLAN_FLAG_SINGLE) {
mcclellanExec8_i(m, &s, buf + start_off, len - start_off,
start_off, cb, ctxt, 1, NULL, CALLBACK_OUTPUT);
} else {
mcclellanExec8_i(m, &s, buf + start_off, len - start_off,
start_off, cb, ctxt, 0, NULL, CALLBACK_OUTPUT);
}
*(u8 *)state = s;
}
void nfaExecMcClellan16_SimpStream(const struct NFA *nfa, char *state,
const u8 *buf, char top, size_t start_off,
size_t len, NfaCallback cb, void *ctxt) {
const struct mcclellan *m = getImplNfa(nfa);
u32 s;
if (top) {
s = m->start_anchored;
// new byte
if (m->has_wide) {
unaligned_store_u16((u16 *)state + 1, 0);
}
} else {
s = unaligned_load_u16(state);
}
if (m->flags & MCCLELLAN_FLAG_SINGLE) {
mcclellanExec16_i(m, &s, state, buf + start_off, len - start_off,
start_off, cb, ctxt, 1, NULL, CALLBACK_OUTPUT);
} else {
mcclellanExec16_i(m, &s, state, buf + start_off, len - start_off,
start_off, cb, ctxt, 0, NULL, CALLBACK_OUTPUT);
}
unaligned_store_u16(state, s);
}
char nfaExecMcClellan8_testEOD(const struct NFA *nfa, const char *state,
UNUSED const char *streamState, u64a offset,
NfaCallback callback, void *context) {
return mcclellanCheckEOD(nfa, *(const u8 *)state, offset, callback,
context);
}
char nfaExecMcClellan16_testEOD(const struct NFA *nfa, const char *state,
UNUSED const char *streamState, u64a offset,
NfaCallback callback, void *context) {
assert(ISALIGNED_N(state, 2));
return mcclellanCheckEOD(nfa, *(const u16 *)state, offset, callback,
context);
}
char nfaExecMcClellan8_queueInitState(UNUSED const struct NFA *nfa,
struct mq *q) {
assert(nfa->scratchStateSize == 1);
*(u8 *)q->state = 0;
return 0;
}
char nfaExecMcClellan16_queueInitState(UNUSED const struct NFA *nfa,
struct mq *q) {
const struct mcclellan *m = getImplNfa(nfa);
assert(m->has_wide == 1 ? nfa->scratchStateSize == 4
: nfa->scratchStateSize == 2);
assert(ISALIGNED_N(q->state, 2));
*(u16 *)q->state = 0;
// new byte
if (m->has_wide) {
unaligned_store_u16((u16 *)q->state + 1, 0);
}
return 0;
}
char nfaExecMcClellan8_queueCompressState(UNUSED const struct NFA *nfa,
const struct mq *q, UNUSED s64a loc) {
void *dest = q->streamState;
const void *src = q->state;
assert(nfa->scratchStateSize == 1);
assert(nfa->streamStateSize == 1);
*(u8 *)dest = *(const u8 *)src;
return 0;
}
char nfaExecMcClellan8_expandState(UNUSED const struct NFA *nfa, void *dest,
const void *src, UNUSED u64a offset,
UNUSED u8 key) {
assert(nfa->scratchStateSize == 1);
assert(nfa->streamStateSize == 1);
*(u8 *)dest = *(const u8 *)src;
return 0;
}
char nfaExecMcClellan16_queueCompressState(UNUSED const struct NFA *nfa,
const struct mq *q,
UNUSED s64a loc) {
const struct mcclellan *m = getImplNfa(nfa);
void *dest = q->streamState;
const void *src = q->state;
assert(m->has_wide == 1 ? nfa->scratchStateSize == 4
: nfa->scratchStateSize == 2);
assert(m->has_wide == 1 ? nfa->streamStateSize == 4
: nfa->streamStateSize == 2);
assert(ISALIGNED_N(src, 2));
unaligned_store_u16(dest, *(const u16 *)(src));
// new byte
if (m->has_wide) {
unaligned_store_u16((u16 *)dest + 1, *((const u16 *)src + 1));
}
return 0;
}
char nfaExecMcClellan16_expandState(UNUSED const struct NFA *nfa, void *dest,
const void *src, UNUSED u64a offset,
UNUSED u8 key) {
const struct mcclellan *m = getImplNfa(nfa);
assert(m->has_wide == 1 ? nfa->scratchStateSize == 4
: nfa->scratchStateSize == 2);
assert(m->has_wide == 1 ? nfa->streamStateSize == 4
: nfa->streamStateSize == 2);
assert(ISALIGNED_N(dest, 2));
*(u16 *)dest = unaligned_load_u16(src);
// new byte
if (m->has_wide) {
*((u16 *)dest + 1) = unaligned_load_u16((const u16 *)src + 1);
}
return 0;
}
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