Initial commit of Hyperscan

src/nfa/rdfa.h

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+/*
+ * 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.
+ */
+
+#ifndef RDFA_H
+#define RDFA_H
+
+#include "nfa_kind.h"
+#include "ue2common.h"
+
+#include "util/ue2_containers.h"
+
+#include <array>
+#include <vector>
+
+namespace ue2 {
+
+typedef u16 dstate_id_t;
+typedef u16 symbol_t;
+
+static constexpr symbol_t TOP = 256;
+static constexpr symbol_t ALPHABET_SIZE = 257;
+static constexpr symbol_t N_SPECIAL_SYMBOL = 1;
+static constexpr dstate_id_t DEAD_STATE = 0;
+
+/** Structure representing a dfa state during construction. */
+struct dstate {
+    /** Next state; indexed by remapped sym */
+    std::vector<dstate_id_t> next;
+
+    /** Set by ng_mcclellan, refined by mcclellancompile */
+    dstate_id_t daddy = 0;
+
+    /** Set by mcclellancompile, implementation state id, excludes edge
+     * decorations */
+    dstate_id_t impl_id = 0;
+
+    /** Reports to fire (at any location). */
+    flat_set<ReportID> reports;
+
+    /** Reports to fire (at EOD). */
+    flat_set<ReportID> reports_eod;
+
+    explicit dstate(size_t alphabet_size) : next(alphabet_size, 0) {}
+};
+
+struct raw_dfa {
+    nfa_kind kind;
+    std::vector<dstate> states;
+    dstate_id_t start_anchored = DEAD_STATE;
+    dstate_id_t start_floating = DEAD_STATE;
+    u16 alpha_size = 0; /* including special symbols */
+
+    /* mapping from input symbol --> equiv class id */
+    std::array<u16, ALPHABET_SIZE> alpha_remap;
+
+    explicit raw_dfa(nfa_kind k) : kind(k) {}
+    virtual ~raw_dfa();
+
+    u16 getImplAlphaSize() const;
+    virtual void stripExtraEodReports(void);
+    bool hasEodReports(void) const;
+};
+
+}
+
+#endif