Initial commit of Hyperscan

src/nfa/accel.c

@@ -0,0 +1,131 @@
+/*
+ * Copyright (c) 2015, 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 "accel.h"
+#include "shufti.h"
+#include "truffle.h"
+#include "vermicelli.h"
+#include "ue2common.h"
+
+const u8 *run_accel(const union AccelAux *accel, const u8 *c, const u8 *c_end) {
+    assert(ISALIGNED_N(accel, alignof(union AccelAux)));
+    const u8 *rv;
+
+    switch (accel->accel_type) {
+    case ACCEL_NONE:
+        DEBUG_PRINTF("accel none %p %p\n", c, c_end);
+        return c;
+
+    case ACCEL_VERM:
+        DEBUG_PRINTF("accel verm %p %p\n", c, c_end);
+        if (c + 15 >= c_end) {
+            return c;
+        }
+
+        rv = vermicelliExec(accel->verm.c, 0, c, c_end);
+        break;
+
+    case ACCEL_VERM_NOCASE:
+        DEBUG_PRINTF("accel verm nc %p %p\n", c, c_end);
+        if (c + 15 >= c_end) {
+            return c;
+        }
+
+        rv = vermicelliExec(accel->verm.c, 1, c, c_end);
+        break;
+
+    case ACCEL_DVERM:
+        DEBUG_PRINTF("accel dverm %p %p\n", c, c_end);
+        if (c + 16 + 1 >= c_end) {
+            return c;
+        }
+
+        /* need to stop one early to get an accurate end state */
+        rv = vermicelliDoubleExec(accel->dverm.c1, accel->dverm.c2, 0, c,
+                                  c_end - 1);
+        break;
+
+    case ACCEL_DVERM_NOCASE:
+        DEBUG_PRINTF("accel dverm nc %p %p\n", c, c_end);
+        if (c + 16 + 1 >= c_end) {
+            return c;
+        }
+
+        /* need to stop one early to get an accurate end state */
+        rv = vermicelliDoubleExec(accel->dverm.c1, accel->dverm.c2, 1, c,
+                                  c_end - 1);
+        break;
+
+    case ACCEL_SHUFTI:
+        DEBUG_PRINTF("accel shufti %p %p\n", c, c_end);
+        if (c + 15 >= c_end) {
+            return c;
+        }
+
+        rv = shuftiExec(accel->shufti.lo, accel->shufti.hi, c, c_end);
+        break;
+
+    case ACCEL_TRUFFLE:
+        DEBUG_PRINTF("accel Truffle %p %p\n", c, c_end);
+        if (c + 15 >= c_end) {
+            return c;
+        }
+
+        rv = truffleExec(accel->truffle.mask1, accel->truffle.mask2, c, c_end);
+        break;
+
+    case ACCEL_DSHUFTI:
+        DEBUG_PRINTF("accel dshufti %p %p\n", c, c_end);
+        if (c + 15 + 1 >= c_end) {
+            return c;
+        }
+
+        /* need to stop one early to get an accurate end state */
+        rv = shuftiDoubleExec(accel->dshufti.lo1,
+                              accel->dshufti.hi1,
+                              accel->dshufti.lo2,
+                              accel->dshufti.hi2, c, c_end - 1);
+        break;
+
+    case ACCEL_RED_TAPE:
+        DEBUG_PRINTF("accel red tape %p %p\n", c, c_end);
+        rv = c_end;
+        break;
+
+    default:
+        assert(!"not here");
+        return c;
+    }
+
+    DEBUG_PRINTF("adjusting for offset %u\n", accel->generic.offset);
+    /* adjust offset to take into account the offset */
+    rv = MAX(c + accel->generic.offset, rv);
+    rv -= accel->generic.offset;
+
+    return rv;
+}