chimera: hybrid of Hyperscan and PCRE

CMakeLists.txt

@@ -70,6 +70,16 @@ include_directories(SYSTEM include)
 
 include (${CMAKE_MODULE_PATH}/boost.cmake)
 
+# PCRE check, we have a fixed requirement for PCRE to use Chimera
+# and hscollider
+set(PCRE_REQUIRED_MAJOR_VERSION 8)
+set(PCRE_REQUIRED_MINOR_VERSION 41)
+set(PCRE_REQUIRED_VERSION ${PCRE_REQUIRED_MAJOR_VERSION}.${PCRE_REQUIRED_MINOR_VERSION})
+include (${CMAKE_MODULE_PATH}/pcre.cmake)
+if (NOT CORRECT_PCRE_VERSION)
+    message(STATUS "PCRE ${PCRE_REQUIRED_VERSION} not found")
+endif()
+
 # -- make this work? set(python_ADDITIONAL_VERSIONS 2.7 2.6)
 find_package(PythonInterp)
 find_program(RAGEL ragel)
@@ -154,7 +164,7 @@ if(MSVC OR MSVC_IDE)
             # todo: change these as required
             set(ARCH_C_FLAGS "/arch:AVX2")
             set(ARCH_CXX_FLAGS "/arch:AVX2")
-            set(MSVC_WARNS "/wd4101 /wd4146 /wd4172 /wd4200 /wd4244 /wd4267 /wd4307 /wd4334 /wd4805 -D_CRT_SECURE_NO_WARNINGS")
+            set(MSVC_WARNS "/wd4101 /wd4146 /wd4172 /wd4200 /wd4244 /wd4267 /wd4307 /wd4334 /wd4805 /wd4996 -D_CRT_SECURE_NO_WARNINGS")
             set(CMAKE_C_FLAGS "${CMAKE_C_FLAGS}  /O2 ${MSVC_WARNS}")
             set(CMAKE_CXX_FLAGS "${CMAKE_CXX_FLAGS} /O2 ${MSVC_WARNS} /wd4800 -DBOOST_DETAIL_NO_CONTAINER_FWD")
         endif()
@@ -445,12 +455,20 @@ else()
     set(CMAKE_CXX_FLAGS "${CMAKE_CXX_FLAGS}")
 endif()
 
+# we need static libs for Chimera - too much deep magic for shared libs
+if (CORRECT_PCRE_VERSION AND BUILD_STATIC_LIBS)
+    set(BUILD_CHIMERA TRUE)
+endif()
+
 add_subdirectory(util)
 add_subdirectory(unit)
 add_subdirectory(doc/dev-reference)
 if (EXISTS ${CMAKE_SOURCE_DIR}/tools/CMakeLists.txt)
     add_subdirectory(tools)
 endif()
+if (EXISTS ${CMAKE_SOURCE_DIR}/chimera/CMakeLists.txt AND BUILD_CHIMERA)
+    add_subdirectory(chimera)
+endif()
 
 # do substitutions
 configure_file(${CMAKE_MODULE_PATH}/config.h.in ${PROJECT_BINARY_DIR}/config.h)

chimera/CMakeLists.txt

@@ -0,0 +1,32 @@
+# Chimera lib
+
+include_directories(${PCRE_INCLUDE_DIRS})
+
+# only set these after all tests are done
+set(CMAKE_C_FLAGS "${CMAKE_C_FLAGS} ${EXTRA_C_FLAGS}")
+set(CMAKE_CXX_FLAGS "${CMAKE_CXX_FLAGS} ${EXTRA_CXX_FLAGS}")
+
+SET(chimera_HEADERS
+    ch.h
+    ch_common.h
+    ch_compile.h
+    ch_runtime.h
+)
+install(FILES ${chimera_HEADERS} DESTINATION "${CMAKE_INSTALL_INCLUDEDIR}/hs")
+
+SET(chimera_SRCS
+    ${chimera_HEADERS}
+    ch_alloc.c
+    ch_alloc.h
+    ch_compile.cpp
+    ch_database.c
+    ch_database.h
+    ch_internal.h
+    ch_runtime.c
+    ch_scratch.h
+    ch_scratch.c
+)
+
+add_library(chimera STATIC ${chimera_SRCS})
+add_dependencies(chimera hs pcre)
+target_link_libraries(chimera hs pcre)

chimera/ch.h

@@ -0,0 +1,45 @@
+/*
+ * Copyright (c) 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.
+ */
+
+#ifndef CH_H_
+#define CH_H_
+
+/**
+ * @file
+ * @brief The complete Chimera API definition.
+ *
+ * Chimera is a hybrid solution of Hyperscan and PCRE.
+ *
+ * This header includes both the Chimera compiler and runtime components. See
+ * the individual component headers for documentation.
+ */
+
+#include "ch_compile.h"
+#include "ch_runtime.h"
+
+#endif /* CH_H_ */

chimera/ch_alloc.c

@@ -0,0 +1,109 @@
+/*
+ * Copyright (c) 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.
+ */
+
+/** \file
+ * \brief Runtime functions for setting custom allocators.
+ */
+
+#include "ch.h"
+#include "ch_common.h"
+#include "ch_internal.h"
+#include "hs.h"
+#include "ue2common.h"
+
+#define default_malloc malloc
+#define default_free free
+
+ch_alloc_t ch_database_alloc = default_malloc;
+ch_alloc_t ch_misc_alloc = default_malloc;
+ch_alloc_t ch_scratch_alloc = default_malloc;
+
+ch_free_t ch_database_free = default_free;
+ch_free_t ch_misc_free = default_free;
+ch_free_t ch_scratch_free = default_free;
+
+static
+ch_alloc_t normalise_alloc(ch_alloc_t a) {
+    if (!a) {
+        return default_malloc;
+    } else {
+        return a;
+    }
+}
+
+static
+ch_free_t normalise_free(ch_free_t f) {
+    if (!f) {
+        return default_free;
+    } else {
+        return f;
+    }
+}
+
+HS_PUBLIC_API
+ch_error_t HS_CDECL ch_set_allocator(ch_alloc_t allocfunc,
+                                     ch_free_t freefunc) {
+    ch_set_database_allocator(allocfunc, freefunc);
+    ch_set_misc_allocator(allocfunc, freefunc);
+    ch_set_scratch_allocator(allocfunc, freefunc);
+
+    // Set core Hyperscan alloc/free.
+    hs_error_t ret = hs_set_allocator(allocfunc, freefunc);
+
+    return ret;
+}
+
+HS_PUBLIC_API
+ch_error_t HS_CDECL ch_set_database_allocator(ch_alloc_t allocfunc,
+                                              ch_free_t freefunc) {
+    ch_database_alloc = normalise_alloc(allocfunc);
+    ch_database_free = normalise_free(freefunc);
+
+    // Set Hyperscan database alloc/free.
+    return hs_set_database_allocator(allocfunc, freefunc);
+}
+
+HS_PUBLIC_API
+ch_error_t HS_CDECL ch_set_misc_allocator(ch_alloc_t allocfunc,
+                                          ch_free_t freefunc) {
+    ch_misc_alloc = normalise_alloc(allocfunc);
+    ch_misc_free = normalise_free(freefunc);
+
+    // Set Hyperscan misc alloc/free.
+    return hs_set_misc_allocator(allocfunc, freefunc);
+}
+
+HS_PUBLIC_API
+ch_error_t HS_CDECL ch_set_scratch_allocator(ch_alloc_t allocfunc,
+                                             ch_free_t freefunc) {
+    ch_scratch_alloc = normalise_alloc(allocfunc);
+    ch_scratch_free = normalise_free(freefunc);
+
+    // Set Hyperscan scratch alloc/free.
+    return hs_set_scratch_allocator(allocfunc, freefunc);
+}

chimera/ch_alloc.h

@@ -0,0 +1,65 @@
+/*
+ * Copyright (c) 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.
+ */
+
+#ifndef CH_ALLOC_H
+#define CH_ALLOC_H
+
+#include "hs_common.h"
+#include "ue2common.h"
+#include "ch_common.h"
+
+#ifdef __cplusplus
+extern "C"
+{
+#endif
+extern hs_alloc_t ch_database_alloc;
+extern hs_alloc_t ch_misc_alloc;
+extern hs_alloc_t ch_scratch_alloc;
+
+extern hs_free_t ch_database_free;
+extern hs_free_t ch_misc_free;
+extern hs_free_t ch_scratch_free;
+#ifdef __cplusplus
+} /* extern C */
+#endif
+/** \brief Check the results of an alloc done with hs_alloc for alignment.
+ *
+ * If we have incorrect alignment, return an error. Caller should free the
+ * offending block. */
+static really_inline
+ch_error_t ch_check_alloc(const void *mem) {
+    ch_error_t ret = CH_SUCCESS;
+    if (!mem) {
+        ret = CH_NOMEM;
+    } else if (!ISALIGNED_N(mem, alignof(unsigned long long))) {
+        ret = CH_BAD_ALLOC;
+    }
+    return ret;
+}
+
+#endif

chimera/ch_common.h

@@ -0,0 +1,360 @@
+/*
+ * Copyright (c) 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.
+ */
+
+#ifndef CH_COMMON_H_
+#define CH_COMMON_H_
+
+#include "hs_common.h"
+
+#include <stdlib.h>
+
+/**
+ * @file
+ * @brief The Chimera common API definition.
+ *
+ * Chimera is a hybrid of Hyperscan and PCRE.
+ *
+ * This header contains functions available to both the Chimera compiler and
+ * runtime.
+ */
+
+#ifdef __cplusplus
+extern "C"
+{
+#endif
+
+struct ch_database;
+
+/**
+ * A Chimera pattern database.
+ *
+ * Generated by one of the Chimera compiler functions:
+ *  - @ref ch_compile()
+ *  - @ref ch_compile_multi()
+ *  - @ref ch_compile_ext_multi()
+ */
+typedef struct ch_database ch_database_t;
+
+/**
+ * A type for errors returned by Chimera functions.
+ */
+typedef int ch_error_t;
+
+/**
+ * Free a compiled pattern database.
+ *
+ * The free callback set by @ref ch_set_allocator()) will be used by this
+ * function.
+ *
+ * @param db
+ *      A compiled pattern database. NULL may also be safely provided, in which
+ *      case the function does nothing.
+ *
+ * @return
+ *      @ref CH_SUCCESS on success, other values on failure.
+ */
+ch_error_t HS_CDECL ch_free_database(ch_database_t *db);
+
+/**
+ * Utility function for identifying this release version.
+ *
+ * @return
+ *      A string containing the version number of this release build and the
+ *      date of the build. It is allocated statically, so it does not need to
+ *      be freed by the caller.
+ */
+const char * HS_CDECL ch_version(void);
+
+/**
+ * Returns the size of the given database.
+ *
+ * @param database
+ *      Pointer to compiled expression database.
+ *
+ * @param database_size
+ *      On success, the size of the compiled database in bytes is placed in this
+ *      parameter.
+ *
+ * @return
+ *      @ref CH_SUCCESS on success, other values on failure.
+ */
+ch_error_t HS_CDECL ch_database_size(const ch_database_t *database,
+                                     size_t *database_size);
+
+/**
+ * Utility function providing information about a database.
+ *
+ * @param database
+ *      Pointer to a compiled database.
+ *
+ * @param info
+ *      On success, a string containing the version and platform information for
+ *      the supplied database is placed in the parameter. The string is
+ *      allocated using the allocator supplied in @ref hs_set_allocator()
+ *      (or malloc() if no allocator was set) and should be freed by the caller.
+ *
+ * @return
+ *      @ref CH_SUCCESS on success, other values on failure.
+ */
+ch_error_t HS_CDECL ch_database_info(const ch_database_t *database,
+                                     char **info);
+
+/**
+ * The type of the callback function that will be used by Chimera to allocate
+ * more memory at runtime as required.
+ *
+ * If Chimera is to be used in a multi-threaded, or similarly concurrent
+ * environment, the allocation function will need to be re-entrant, or
+ * similarly safe for concurrent use.
+ *
+ * @param size
+ *      The number of bytes to allocate.
+ * @return
+ *      A pointer to the region of memory allocated, or NULL on error.
+ */
+typedef void *(HS_CDECL *ch_alloc_t)(size_t size);
+
+/**
+ * The type of the callback function that will be used by Chimera to free
+ * memory regions previously allocated using the @ref ch_alloc_t function.
+ *
+ * @param ptr
+ *      The region of memory to be freed.
+ */
+typedef void (HS_CDECL *ch_free_t)(void *ptr);
+
+/**
+ * Set the allocate and free functions used by Chimera for allocating
+ * memory at runtime for stream state, scratch space, database bytecode,
+ * and various other data structure returned by the Chimera API.
+ *
+ * The function is equivalent to calling @ref ch_set_scratch_allocator(),
+ * @ref ch_set_database_allocator() and
+ * @ref ch_set_misc_allocator() with the provided parameters.
+ *
+ * This call will override any previous allocators that have been set.
+ *
+ * Note: there is no way to change the allocator used for temporary objects
+ * created during the various compile calls (@ref ch_compile() and @ref
+ * ch_compile_multi()).
+ *
+ * @param alloc_func
+ *      A callback function pointer that allocates memory. This function must
+ *      return memory suitably aligned for the largest representable data type
+ *      on this platform.
+ *
+ * @param free_func
+ *      A callback function pointer that frees allocated memory.
+ *
+ * @return
+ *      @ref CH_SUCCESS on success, other values on failure.
+ */
+ch_error_t HS_CDECL ch_set_allocator(ch_alloc_t alloc_func,
+                                     ch_free_t free_func);
+
+/**
+ * Set the allocate and free functions used by Chimera for allocating memory
+ * for database bytecode produced by the compile calls (@ref ch_compile() and @ref
+ * ch_compile_multi()).
+ *
+ * If no database allocation functions are set, or if NULL is used in place of
+ * both parameters, then memory allocation will default to standard methods
+ * (such as the system malloc() and free() calls).
+ *
+ * This call will override any previous database allocators that have been set.
+ *
+ * Note: the database allocator may also be set by calling @ref
+ * ch_set_allocator().
+ *
+ * Note: there is no way to change how temporary objects created during the
+ * various compile calls (@ref ch_compile() and @ref ch_compile_multi()) are
+ * allocated.
+ *
+ * @param alloc_func
+ *      A callback function pointer that allocates memory. This function must
+ *      return memory suitably aligned for the largest representable data type
+ *      on this platform.
+ *
+ * @param free_func
+ *      A callback function pointer that frees allocated memory.
+ *
+ * @return
+ *      @ref HS_SUCCESS on success, other values on failure.
+ */
+ch_error_t HS_CDECL ch_set_database_allocator(ch_alloc_t alloc_func,
+                                              ch_free_t free_func);
+
+/**
+ * Set the allocate and free functions used by Chimera for allocating memory
+ * for items returned by the Chimera API such as @ref ch_compile_error_t.
+ *
+ * If no misc allocation functions are set, or if NULL is used in place of both
+ * parameters, then memory allocation will default to standard methods (such as
+ * the system malloc() and free() calls).
+ *
+ * This call will override any previous misc allocators that have been set.
+ *
+ * Note: the misc allocator may also be set by calling @ref ch_set_allocator().
+ *
+ * @param alloc_func
+ *      A callback function pointer that allocates memory. This function must
+ *      return memory suitably aligned for the largest representable data type
+ *      on this platform.
+ *
+ * @param free_func
+ *      A callback function pointer that frees allocated memory.
+ *
+ * @return
+ *      @ref CH_SUCCESS on success, other values on failure.
+ */
+ch_error_t HS_CDECL ch_set_misc_allocator(ch_alloc_t alloc_func,
+                                          ch_free_t free_func);
+
+/**
+ * Set the allocate and free functions used by Chimera for allocating memory
+ * for scratch space by @ref ch_alloc_scratch() and @ref ch_clone_scratch().
+ *
+ * If no scratch allocation functions are set, or if NULL is used in place of
+ * both parameters, then memory allocation will default to standard methods
+ * (such as the system malloc() and free() calls).
+ *
+ * This call will override any previous scratch allocators that have been set.
+ *
+ * Note: the scratch allocator may also be set by calling @ref
+ * ch_set_allocator().
+ *
+ * @param alloc_func
+ *      A callback function pointer that allocates memory. This function must
+ *      return memory suitably aligned for the largest representable data type
+ *      on this platform.
+ *
+ * @param free_func
+ *      A callback function pointer that frees allocated memory.
+ *
+ * @return
+ *      @ref CH_SUCCESS on success, other values on failure.
+ */
+ch_error_t HS_CDECL ch_set_scratch_allocator(ch_alloc_t alloc_func,
+                                             ch_free_t free_func);
+
+/**
+ * @defgroup CH_ERROR ch_error_t values
+ *
+ * @{
+ */
+
+/**
+ * The engine completed normally.
+ */
+#define CH_SUCCESS              0
+
+/**
+ * A parameter passed to this function was invalid.
+ */
+#define CH_INVALID              (-1)
+
+/**
+ * A memory allocation failed.
+ */
+#define CH_NOMEM                (-2)
+
+/**
+ * The engine was terminated by callback.
+ *
+ * This return value indicates that the target buffer was partially scanned,
+ * but that the callback function requested that scanning cease after a match
+ * was located.
+ */
+#define CH_SCAN_TERMINATED      (-3)
+
+/**
+ * The pattern compiler failed, and the @ref ch_compile_error_t should be
+ * inspected for more detail.
+ */
+#define CH_COMPILER_ERROR       (-4)
+
+/**
+ * The given database was built for a different version of the Chimera matcher.
+ */
+#define CH_DB_VERSION_ERROR     (-5)
+
+/**
+ * The given database was built for a different platform (i.e., CPU type).
+ */
+#define CH_DB_PLATFORM_ERROR    (-6)
+
+/**
+ * The given database was built for a different mode of operation.  This error
+ * is returned when streaming calls are used with a non-streaming database and
+ * vice versa.
+ */
+#define CH_DB_MODE_ERROR        (-7)
+
+/**
+ * A parameter passed to this function was not correctly aligned.
+ */
+#define CH_BAD_ALIGN            (-8)
+
+/**
+ * The memory allocator did not correctly return memory suitably aligned for
+ * the largest representable data type on this platform.
+ */
+#define CH_BAD_ALLOC            (-9)
+
+/**
+ * The scratch region was already in use.
+ *
+ * This error is returned when Chimera is able to detect that the scratch
+ * region given is already in use by another Chimera API call.
+ *
+ * A separate scratch region, allocated with @ref ch_alloc_scratch() or @ref
+ * ch_clone_scratch(), is required for every concurrent caller of the Chimera
+ * API.
+ *
+ * For example, this error might be returned when @ref ch_scan() has been
+ * called inside a callback delivered by a currently-executing @ref ch_scan()
+ * call using the same scratch region.
+ *
+ * Note: Not all concurrent uses of scratch regions may be detected. This error
+ * is intended as a best-effort debugging tool, not a guarantee.
+ */
+#define CH_SCRATCH_IN_USE       (-10)
+
+/**
+ * Returned when pcre_exec (called for some expressions internally from @ref
+ * ch_scan) failed due to a fatal error.
+ */
+#define CH_FAIL_INTERNAL        (-32)
+
+/** @} */
+
+#ifdef __cplusplus
+} /* extern "C" */
+#endif
+
+#endif /* CH_COMMON_H_ */

chimera/ch_compile.cpp

@@ -0,0 +1,878 @@
+/*
+ * Copyright (c) 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.
+ */
+
+/** \file
+ * \brief Compiler front-end, including public API calls for compilation.
+ */
+
+#include "ch_compile.h"
+#include "ch_alloc.h"
+#include "ch_internal.h"
+#include "ch_database.h"
+#include "grey.h"
+#include "hs_common.h"
+#include "hs_internal.h"
+#include "ue2common.h"
+#include "util/compile_error.h"
+#include "util/make_unique.h"
+#include "util/multibit_build.h"
+#include "util/target_info.h"
+
+#include <algorithm>
+#include <cassert>
+#include <cstddef>
+#include <cstring>
+#include <memory>
+#include <ostream>
+#include <sstream>
+#include <limits.h>
+#include <string>
+#include <vector>
+
+#include <boost/core/noncopyable.hpp>
+
+#define PCRE_ERROR_MSG "Internal error building PCRE pattern."
+
+using namespace std;
+using namespace ue2;
+
+static const char failureNoMemory[] = "Unable to allocate memory.";
+static const char failureInternal[] = "Internal error.";
+static const char failureBadAlloc[] = "Allocator returned misaligned memory.";
+
+static const ch_compile_error_t ch_enomem
+    = { const_cast<char *>(failureNoMemory), 0 };
+static const ch_compile_error_t ch_einternal
+    = { const_cast<char *>(failureInternal), 0 };
+static const ch_compile_error_t ch_badalloc
+    = { const_cast<char *>(failureBadAlloc), 0 };
+
+static
+ch_compile_error_t *generateChimeraCompileError(const string &err,
+                                                int expression) {
+    ch_compile_error_t *ret =
+        (struct ch_compile_error *)ch_misc_alloc(sizeof(ch_compile_error_t));
+    if (ret) {
+        ch_error_t e = ch_check_alloc(ret);
+        if (e != CH_SUCCESS) {
+            ch_misc_free(ret);
+            return const_cast<ch_compile_error_t *>(&ch_badalloc);
+        }
+        char *msg = (char *)ch_misc_alloc(err.size() + 1);
+        if (msg) {
+            e = ch_check_alloc(msg);
+            if (e != HS_SUCCESS) {
+                ch_misc_free(msg);
+                return const_cast<ch_compile_error_t *>(&ch_badalloc);
+            }
+            memcpy(msg, err.c_str(), err.size() + 1);
+            ret->message = msg;
+        } else {
+            ch_misc_free(ret);
+            ret = nullptr;
+        }
+    }
+
+    if (!ret || !ret->message) {
+        return const_cast<ch_compile_error_t *>(&ch_enomem);
+    }
+
+    ret->expression = expression;
+
+    return ret;
+}
+
+static
+void freeChimeraCompileError(ch_compile_error_t *error) {
+    if (!error) {
+        return;
+    }
+    if (error == &ch_enomem || error == &ch_einternal ||
+        error == &ch_badalloc) {
+        // These are not allocated.
+        return;
+    }
+
+    ch_misc_free(error->message);
+    ch_misc_free(error);
+}
+
+static
+bool checkMode(unsigned int mode, ch_compile_error_t **comp_error) {
+    static const unsigned int supported = CH_MODE_GROUPS;
+
+    if (mode & ~supported) {
+        *comp_error =
+            generateChimeraCompileError("Invalid mode flag supplied.", -1);
+        return false;
+    }
+    return true;
+}
+
+/** \brief Throw a compile error if we're passed some unsupported flags. */
+static
+void checkFlags(const unsigned int flags) {
+    static const unsigned int supported = HS_FLAG_DOTALL
+                                        | HS_FLAG_MULTILINE
+                                        | HS_FLAG_CASELESS
+                                        | HS_FLAG_SINGLEMATCH
+                                        | HS_FLAG_UCP
+                                        | HS_FLAG_UTF8;
+
+    if (flags & ~supported) {
+        throw CompileError("Unrecognized flag used.");
+    }
+}
+
+static
+bool isHyperscanSupported(const char *expression, unsigned int flags,
+                          const hs_platform_info *platform) {
+    hs_database_t *db = nullptr;
+    hs_compile_error *comp_error = nullptr;
+
+    unsigned int id = 0;
+    hs_error_t err = hs_compile_multi(&expression, &flags, &id,
+                                      1, HS_MODE_BLOCK, platform, &db,
+                                      &comp_error);
+    if (err != HS_SUCCESS) {
+        assert(!db);
+        assert(comp_error);
+        DEBUG_PRINTF("unsupported: %s\n", comp_error->message);
+        hs_free_compile_error(comp_error);
+
+        return false;
+    }
+
+    assert(db);
+    assert(!comp_error);
+    hs_free_database(db);
+    return true;
+}
+
+static
+bool writeHyperscanDatabase(char *ptr, hs_database_t *db) {
+    // Note: we must use our serialization calls to re-home the database.
+    char *serialized = nullptr;
+    size_t slen = 0;
+    hs_error_t err = hs_serialize_database(db, &serialized, &slen);
+    if (err != HS_SUCCESS) {
+        DEBUG_PRINTF("hs_serialize_database returned %d\n", err);
+        assert(0);
+        return false;
+    }
+
+    DEBUG_PRINTF("writing database to ptr %p\n", ptr);
+
+    // deserialize_at without the platform tests.
+    err = hs_deserialize_database_at(serialized, slen, (hs_database_t *)ptr);
+    if (err != HS_SUCCESS) {
+        DEBUG_PRINTF("hs_deserialize_database_at returned %d\n", err);
+        assert(0);
+        ch_misc_free(serialized);
+        return false;
+    }
+
+    ch_misc_free(serialized);
+    return true;
+}
+
+static
+bool writeHyperscanDatabase(ch_bytecode *db, hs_database_t *hs_db) {
+    db->databaseOffset = ROUNDUP_CL(sizeof(*db));
+    char *ptr = (char *)db + db->databaseOffset;
+    return writeHyperscanDatabase(ptr, hs_db);
+}
+
+static
+int convertFlagsToPcreOptions(unsigned int flags) {
+    int options = 0;
+    if (flags & HS_FLAG_CASELESS) {
+        options |= PCRE_CASELESS;
+    }
+    if (flags & HS_FLAG_DOTALL) {
+        options |= PCRE_DOTALL;
+    }
+    if (flags & HS_FLAG_MULTILINE) {
+        options |= PCRE_MULTILINE;
+    }
+    if (flags & HS_FLAG_UTF8) {
+        options |= PCRE_UTF8;
+    }
+    if (flags & HS_FLAG_UCP) {
+        options |= PCRE_UCP;
+    }
+
+    // All other flags are meaningless to PCRE.
+
+    return options;
+}
+
+namespace {
+
+/** \brief Data about a single pattern. */
+struct PatternData : boost::noncopyable {
+    PatternData(const char *pattern, u32 flags, u32 idx, u32 id_in,
+                unsigned mode, unsigned long int match_limit,
+                unsigned long int match_limit_recursion,
+                const hs_platform_info *platform);
+    ~PatternData() {
+        pcre_free(compiled);
+        pcre_free(extra);
+    }
+
+    void buildPcre(const char *pattern, u32 flags);
+
+    size_t patternSize() const;
+
+    void writePattern(ch_pattern *pattern) const;
+
+    pcre *compiled;                     //!< pcre_compile output
+    pcre_extra *extra;                  //!< pcre_study output
+    size_t compiled_size;
+    int study_size;
+    int capture_cnt;
+    bool utf8;
+    u32 id;                             //!< ID from the user
+    u32 expr_index;                     //!< index in the expression array
+    bool singlematch;                   //!< pattern is in highlander mode
+    bool guard;       //!< this pattern should be guarded by the multimatcher
+    u32 minWidth;     //!< min match width
+    u32 maxWidth;     //!< max match width
+    u32 fixedWidth;   //!< fixed pattern width
+    unsigned long int matchLimit; //! pcre match limit
+    unsigned long int matchLimitRecursion; //! pcre match_limit_recursion
+};
+
+PatternData::PatternData(const char *pattern, u32 flags, u32 idx, u32 id_in,
+                         unsigned mode, unsigned long int match_limit,
+                         unsigned long int match_limit_recursion,
+                         const hs_platform_info *platform)
+    : compiled(nullptr), extra(nullptr), id(id_in), expr_index(idx),
+      singlematch(flags & HS_FLAG_SINGLEMATCH),
+      guard(false), minWidth(0), maxWidth(UINT_MAX),
+      fixedWidth(UINT_MAX), matchLimit(match_limit),
+      matchLimitRecursion(match_limit_recursion) {
+    assert(pattern);
+
+    flags |= HS_FLAG_ALLOWEMPTY; /* don't hand things off to pcre for no
+                                    reason */
+
+    buildPcre(pattern, flags);
+
+    // Fetch the expression info for a prefiltering, non-singlematch version of
+    // this pattern, if possible.
+    hs_expr_info *info = nullptr;
+    hs_compile_error_t *error = nullptr;
+    u32 infoflags = (flags | HS_FLAG_PREFILTER) & ~HS_FLAG_SINGLEMATCH;
+    u32 rawflags = (flags | HS_FLAG_SOM_LEFTMOST) & ~HS_FLAG_SINGLEMATCH;
+    hs_error_t err = hs_expression_info(pattern, infoflags, &info, &error);
+    if (err == HS_SUCCESS) {
+        assert(info);
+        hs_expr_info *i = (hs_expr_info *)info;
+        minWidth = i->min_width;
+        maxWidth = i->max_width;
+        bool ordered = i->unordered_matches ? false : true;
+
+        // Only enable capturing if required
+        u32 captureCnt = 0;
+        if (mode & CH_MODE_GROUPS) {
+            captureCnt = capture_cnt;
+        }
+
+        // No need to confirm with PCRE if:
+        // 1) pattern is fixed width
+        // 2) pattern isn't vacuous as it can't combine with start of match
+        // 3) no capturing in this pattern
+        // 4) no offset adjust in this pattern as hyperscan match callback
+        //    will arrive without order, i.e. [^a]\z has offset adjust
+        // 5) hyperscan compile succeeds without prefiltering
+        if (minWidth == maxWidth && minWidth && maxWidth != UINT_MAX &&
+            !captureCnt && ordered &&
+            isHyperscanSupported(pattern, rawflags, platform)) {
+            fixedWidth = maxWidth;
+        }
+
+        DEBUG_PRINTF("gathered info: widths=[%u,%u]\n", minWidth, maxWidth);
+
+        ch_misc_free(info);
+
+        u32 guardflags;
+        guardflags = (flags | HS_FLAG_PREFILTER) & ~HS_FLAG_SINGLEMATCH;
+        guard = isHyperscanSupported(pattern, guardflags, platform);
+    } else {
+        // We can't even prefilter this pattern, so we're dependent on Big Dumb
+        // Pcre Scans.
+        DEBUG_PRINTF("hs_expression_info failed, falling back to pcre\n");
+        hs_free_compile_error(error);
+    }
+}
+
+void PatternData::buildPcre(const char *pattern, u32 flags) {
+    int options = convertFlagsToPcreOptions(flags);
+    const char *errptr = nullptr;
+    int erroffset = 0;
+
+    compiled = pcre_compile(pattern, options, &errptr, &erroffset, nullptr);
+    if (!compiled) {
+        DEBUG_PRINTF("PCRE failed to compile: %s\n", pattern);
+        string err("PCRE compilation failed: ");
+        err += string(errptr);
+        err += ".";
+        throw CompileError(expr_index, err);
+    }
+
+    extra = pcre_study(compiled, PCRE_STUDY_JIT_COMPILE, &errptr);
+    // Note that it's OK for pcre_study to return NULL if there's nothing
+    // to be found, but a non-NULL error is always bad.
+    if (errptr) {
+        DEBUG_PRINTF("PCRE could not be studied: %s\n", errptr);
+        string err("PCRE compilation failed: ");
+        err += string(errptr);
+        err += ".";
+        throw CompileError(expr_index, err);
+    }
+
+    if (pcre_fullinfo(compiled, extra, PCRE_INFO_SIZE, &compiled_size)) {
+        throw CompileError(PCRE_ERROR_MSG);
+    }
+
+    if (!extra) {
+        study_size = 0;
+    } else {
+        if (pcre_fullinfo(compiled, extra, PCRE_INFO_STUDYSIZE, &study_size)) {
+            throw CompileError(PCRE_ERROR_MSG);
+        }
+    }
+
+    if (pcre_fullinfo(compiled, extra, PCRE_INFO_CAPTURECOUNT, &capture_cnt)) {
+        throw CompileError(PCRE_ERROR_MSG);
+    }
+
+    /* We use the pcre rather than hs to get this information as we may need it
+     * even in the pure unguarded pcre mode where there is no hs available. We
+     * can not use the compile flags due to (*UTF8) verb */
+    unsigned long int opts = 0; // PCRE_INFO_OPTIONS demands an unsigned long
+    if (pcre_fullinfo(compiled, extra, PCRE_INFO_OPTIONS, &opts)) {
+        throw CompileError(PCRE_ERROR_MSG);
+    }
+    utf8 = opts & PCRE_UTF8;
+}
+
+size_t PatternData::patternSize() const {
+    size_t len = 0;
+
+    // ch_pattern header.
+    len += sizeof(ch_pattern);
+
+    len = ROUNDUP_N(len, 8);
+    DEBUG_PRINTF("compiled pcre at %zu\n", len);
+    len += compiled_size;
+
+    // PCRE study data, which may be zero.
+    if (study_size) {
+        len = ROUNDUP_N(len, 8);
+        DEBUG_PRINTF("study at %zu\n", len);
+        len += (size_t)study_size;
+    }
+
+    DEBUG_PRINTF("pattern size %zu\n", len);
+    return len;
+}
+
+/** \brief Write out an ch_pattern structure, which should already be sized
+ * correctly according to PatternData::patternSize. */
+void PatternData::writePattern(ch_pattern *pattern) const {
+    assert(pattern);
+    assert(ISALIGNED_CL(pattern));
+
+    pattern->id = id;
+
+    u32 flags = 0;
+    if (singlematch) {
+        flags |= CHIMERA_PATTERN_FLAG_SINGLEMATCH;
+    }
+    if (utf8) {
+        flags |= CHIMERA_PATTERN_FLAG_UTF8;
+    }
+
+    pattern->flags = flags;
+    pattern->maxWidth = maxWidth;
+    pattern->minWidth = minWidth == UINT_MAX ? 0 : minWidth;
+    pattern->fixedWidth = fixedWidth;
+
+    // Compiled PCRE pattern.
+    char *ptr = (char *)pattern;
+    ptr += ROUNDUP_N(sizeof(*pattern), 8);
+    DEBUG_PRINTF("compiled pcre at %zu\n", (size_t)(ptr - (char *)pattern));
+    memcpy(ptr, compiled, compiled_size);
+    ptr += compiled_size;
+
+    // PCRE match limits
+    pattern->extra.flags = PCRE_EXTRA_MATCH_LIMIT |
+                           PCRE_EXTRA_MATCH_LIMIT_RECURSION;
+    pattern->extra.match_limit = matchLimit ? matchLimit : 10000000;
+    // Set to avoid segment fault
+    pattern->extra.match_limit_recursion =
+        matchLimitRecursion ? matchLimitRecursion : 1500;
+
+    // PCRE study_data.
+    u32 studyOffset = 0;
+    if (extra) {
+        assert(extra->study_data);
+        ptr = ROUNDUP_PTR(ptr, 8);
+        DEBUG_PRINTF("study at %zu\n", (size_t)(ptr - (char *)pattern));
+        memcpy(ptr, extra->study_data, study_size);
+        studyOffset = (size_t)(ptr - (char *)pattern);
+
+        pattern->extra.flags |= PCRE_EXTRA_STUDY_DATA;
+        pattern->extra.study_data = ptr;
+
+        ptr += study_size;
+    } else {
+        pattern->extra.flags &= ~PCRE_EXTRA_STUDY_DATA;
+    }
+    pattern->studyOffset = studyOffset;
+
+    size_t pcreLen = (ptr - (char *)pattern);
+    assert(pcreLen <= patternSize());
+    pattern->length = (u32)pcreLen;
+
+    // We shouldn't overrun the space we've allocated for this pattern.
+    assert(patternSize() >= (size_t)(ptr - (char *)pattern));
+}
+
+} // namespace
+
+namespace ch {
+
+static
+void ch_compile_multi_int(const char *const *expressions, const unsigned *flags,
+                          const unsigned *ids, unsigned elements,
+                          unsigned mode, unsigned long int match_limit,
+                          unsigned long int match_limit_recursion,
+                          const hs_platform_info_t *platform,
+                          ch_database_t **out) {
+    vector<unique_ptr<PatternData>> pcres;
+    pcres.reserve(elements);
+    vector<u32> unguarded; // indices of unguarded PCREs.
+    vector<const char *> multiExpr;
+    vector<unsigned int> multiFlags;
+    vector<unsigned int> multiIds;
+    bool allConfirm = true;
+    bool allSingleMatch = true;
+    for (unsigned int i = 0; i < elements; i++) {
+        const char *myExpr = expressions[i];
+        unsigned int myFlags = flags ? flags[i] : 0;
+        unsigned int myId = ids ? ids[i] : 0;
+
+        checkFlags(myFlags);
+
+        // First, build with libpcre. A build failure from libpcre will throw
+        // an exception up to the caller.
+        auto patternData =
+            ue2::make_unique<PatternData>(myExpr, myFlags, i, myId, mode, match_limit,
+                                          match_limit_recursion, platform);
+        pcres.push_back(move(patternData));
+        PatternData &curr = *pcres.back();
+
+        if (!(myFlags & HS_FLAG_SINGLEMATCH)) {
+            allSingleMatch = false;
+        }
+
+        // in the multimatch, we always run in prefilter mode and accept vacuous
+        // patterns.
+        myFlags |=
+            HS_FLAG_ALLOWEMPTY | HS_FLAG_PREFILTER;
+
+        if (curr.fixedWidth != UINT_MAX) {
+            myFlags |= HS_FLAG_SOM_LEFTMOST;
+            DEBUG_PRINTF("fixed width, turn off prefiltering\n");
+            myFlags &= ~HS_FLAG_PREFILTER;
+            allConfirm = false;
+
+            // Single match can't coexist with SOM.
+            myFlags &= ~HS_FLAG_SINGLEMATCH;
+        }
+
+        if (curr.guard) {
+            // We use the index into the PCREs array as the Hyperscan idx.
+            multiExpr.push_back(myExpr);
+            multiFlags.push_back(myFlags);
+            multiIds.push_back(i);
+        } else {
+            // No Hyperscan support, PCRE is unguarded.
+            unguarded.push_back(i);
+        }
+    }
+
+    DEBUG_PRINTF("built %zu PCREs, %zu of which are unguarded\n",
+                 pcres.size(), unguarded.size());
+
+    // Work out our sizing for the output database.
+    size_t patternSize = 0;
+    for (unsigned int i = 0; i < elements; i++) {
+        size_t len = pcres[i]->patternSize();
+        patternSize += ROUNDUP_CL(len);
+    }
+    DEBUG_PRINTF("pcre bytecode takes %zu bytes\n", patternSize);
+
+    bool noMulti = multiExpr.empty();
+    size_t multiSize = 0;
+    hs_database *multidb = nullptr;
+    if (!noMulti) {
+        hs_compile_error_t *hs_comp_error = nullptr;
+        hs_error_t err = hs_compile_multi(&multiExpr[0], &multiFlags[0],
+                                          &multiIds[0], multiExpr.size(),
+                                          HS_MODE_BLOCK, platform, &multidb,
+                                          &hs_comp_error);
+
+        if (err != HS_SUCCESS) {
+            assert(hs_comp_error);
+            DEBUG_PRINTF("hs_compile_multi returned error: %s\n",
+                         hs_comp_error->message);
+            assert(0);
+            hs_free_compile_error(hs_comp_error);
+            throw CompileError("Internal error.");
+        }
+
+        assert(multidb);
+        err = hs_database_size(multidb, &multiSize);
+        if (err != HS_SUCCESS) {
+            assert(0);
+            throw CompileError("Internal error.");
+        }
+        DEBUG_PRINTF("built hyperscan database with len %zu bytes\n", multiSize);
+    }
+
+    size_t bytecodeLen = sizeof(ch_bytecode) +
+                         multiSize + alignof(u32) +
+                         (sizeof(u32) * unguarded.size()) +
+                         (sizeof(u32) * elements) +
+                         patternSize +
+                         128; // padding for alignment
+    size_t totalSize = sizeof(ch_database) + bytecodeLen;
+
+    DEBUG_PRINTF("allocating %zu bytes for database\n", totalSize);
+    char *ptr = (char *)ch_database_alloc(totalSize);
+    if (ch_check_alloc(ptr) != CH_SUCCESS) {
+        ch_database_free(ptr);
+        throw std::bad_alloc();
+    }
+
+    memset(ptr, 0, totalSize);
+
+    // First, the header.
+    ch_database *hydb = (ch_database *)ptr;
+    hydb->magic = CH_DB_MAGIC;
+    hydb->version = HS_VERSION_32BIT;
+    hydb->length = bytecodeLen;
+
+    // Then, the bytecode.
+    size_t shift = (size_t)hydb->bytes & 0x3f;
+    hydb->bytecode = offsetof(struct ch_database, bytes) - shift;
+    ch_bytecode *db = (ch_bytecode *)((char *)hydb + hydb->bytecode);
+    db->patternCount = elements;
+    db->activeSize = mmbit_size(elements);
+    db->flags = 0;
+    db->length = bytecodeLen;
+
+    if (noMulti) {
+        db->flags |= CHIMERA_FLAG_NO_MULTIMATCH;
+    }
+    if (mode & CH_MODE_GROUPS) {
+        db->flags |= CHIMERA_FLAG_GROUPS;
+    }
+    if (allConfirm) {
+        db->flags |= CHIMERA_FLAG_ALL_CONFIRM;
+    }
+    if (allSingleMatch) {
+        db->flags |= CHIMERA_FLAG_ALL_SINGLE;
+    }
+
+
+    // Find and set the max ovector size by looking at the capture count for
+    // each pcre.
+    u32 maxCaptureGroups = 0;
+    for (unsigned int i = 0; i < elements; i++) {
+        maxCaptureGroups = max(maxCaptureGroups, (u32)pcres[i]->capture_cnt);
+    }
+    db->maxCaptureGroups = maxCaptureGroups;
+    DEBUG_PRINTF("max capture groups is %u\n", maxCaptureGroups);
+
+    if (!noMulti) {
+        DEBUG_PRINTF("write hyperscan database\n");
+        // Write Hyperscan database directly after the header struct, then free it.
+        if (!writeHyperscanDatabase(db, multidb)) {
+            ch_database_free(hydb);
+            hs_free_database(multidb);
+            throw CompileError("Internal error.");
+        }
+        hs_free_database(multidb);
+    } else {
+        db->databaseOffset = ROUNDUP_CL(sizeof(*db));
+    }
+
+    // Then, write our unguarded PCRE list.
+    db->unguardedCount = unguarded.size();
+    db->unguardedOffset = ROUNDUP_N(db->databaseOffset + multiSize, 4);
+    ptr = (char *)db + db->unguardedOffset;
+    copy(unguarded.begin(), unguarded.end(), (u32 *)ptr);
+
+    // Then, write all our compiled PCRE patterns and the lookup table for
+    // them.
+    db->patternOffset = db->unguardedOffset + unguarded.size() * sizeof(u32);
+    u32 *patternOffset = (u32 *)((char *)db + db->patternOffset);
+    u32 offset = ROUNDUP_CL(db->patternOffset + elements * sizeof(u32));
+    for (unsigned int i = 0; i < elements; i++) {
+        *patternOffset = offset;
+        size_t len = pcres[i]->patternSize();
+        ptr = (char *)db + offset;
+        struct ch_pattern *pattern = (struct ch_pattern *)ptr;
+        pcres[i]->writePattern(pattern);
+        DEBUG_PRINTF("wrote pcre %u into offset %u, len %zu\n", i, offset, len);
+        offset += ROUNDUP_CL(len);
+        patternOffset++;
+    }
+
+    assert(offset <= totalSize);
+    assert(hydb->magic == CH_DB_MAGIC);
+    DEBUG_PRINTF("built hybrid database, size %zu bytes\n", totalSize);
+    DEBUG_PRINTF("offset=%u\n", offset);
+    *out = hydb;
+}
+
+} // namespace ch
+
+extern "C" HS_PUBLIC_API
+ch_error_t HS_CDECL ch_compile(const char *expression, unsigned flags,
+                               unsigned mode,
+                               const hs_platform_info_t *platform,
+                               ch_database_t **db,
+                               ch_compile_error_t **comp_error) {
+    if (!comp_error) {
+        if (db) {
+            db = nullptr;
+        }
+        // nowhere to write the string, but we can still report an error code
+        return CH_COMPILER_ERROR;
+    }
+    if (!db) {
+        *comp_error =
+            generateChimeraCompileError("Invalid parameter: db is NULL", -1);
+        return CH_COMPILER_ERROR;
+    }
+    if (!expression) {
+        *db = nullptr;
+        *comp_error =
+            generateChimeraCompileError("Invalid parameter: expressions is\
+                                         NULL", -1);
+        return CH_COMPILER_ERROR;
+    }
+
+    if (!checkMode(mode, comp_error)) {
+        *db = nullptr;
+        assert(*comp_error); // set by checkMode
+        return CH_COMPILER_ERROR;
+    }
+
+    try {
+        unsigned id = 0; // single expressions get zero as an ID
+        // Internal function to do all the work, now that we've handled all the
+        // argument checking.
+        ch::ch_compile_multi_int(&expression, &flags, &id, 1, mode, 0, 0,
+                                 platform, db);
+    }
+    catch (const CompileError &e) {
+        // Compiler error occurred
+        *db = nullptr;
+        *comp_error = generateChimeraCompileError(e.reason, e.hasIndex ?
+                                                  (int)e.index : -1);
+        return CH_COMPILER_ERROR;
+    }
+    catch (std::bad_alloc) {
+        *db = nullptr;
+        *comp_error = const_cast<ch_compile_error_t *>(&ch_enomem);
+        return CH_COMPILER_ERROR;
+    }
+    catch (...) {
+        assert(!"Internal error, unexpected exception");
+        *db = nullptr;
+        *comp_error = const_cast<ch_compile_error_t *>(&ch_einternal);
+        return CH_COMPILER_ERROR;
+    }
+
+    DEBUG_PRINTF("success!\n");
+    return CH_SUCCESS;
+}
+
+extern "C" HS_PUBLIC_API
+ch_error_t HS_CDECL ch_compile_multi(const char *const *expressions,
+                                     const unsigned *flags, const unsigned *ids,
+                                     unsigned elements, unsigned mode,
+                                     const hs_platform_info_t *platform,
+                                     ch_database_t **db,
+                                     ch_compile_error_t **comp_error) {
+    if (!comp_error) {
+        if (db) {
+            db = nullptr;
+        }
+        // nowhere to write the string, but we can still report an error code
+        return CH_COMPILER_ERROR;
+    }
+    if (!db) {
+        *comp_error =
+            generateChimeraCompileError("Invalid parameter: db is NULL", -1);
+        return CH_COMPILER_ERROR;
+    }
+    if (!expressions) {
+        *db = nullptr;
+        *comp_error =
+            generateChimeraCompileError("Invalid parameter: expressions is\
+                                         NULL", -1);
+        return CH_COMPILER_ERROR;
+    }
+    if (!elements) {
+        *db = nullptr;
+        *comp_error = generateChimeraCompileError("Invalid parameter:\
+                                                   elements is zero", -1);
+        return CH_COMPILER_ERROR;
+    }
+
+    if (!checkMode(mode, comp_error)) {
+        *db = nullptr;
+        assert(*comp_error); // set by checkMode
+        return CH_COMPILER_ERROR;
+    }
+
+    try {
+        // Internal function to do all the work, now that we've handled all the
+        // argument checking.
+        ch::ch_compile_multi_int(expressions, flags, ids, elements, mode, 0, 0,
+                                 platform, db);
+    }
+    catch (const CompileError &e) {
+        // Compiler error occurred
+        *db = nullptr;
+        *comp_error = generateChimeraCompileError(e.reason, e.hasIndex ?
+                                                  (int)e.index : -1);
+        return CH_COMPILER_ERROR;
+    }
+    catch (std::bad_alloc) {
+        *db = nullptr;
+        *comp_error = const_cast<ch_compile_error_t *>(&ch_enomem);
+        return CH_COMPILER_ERROR;
+    }
+    catch (...) {
+        assert(!"Internal error, unexpected exception");
+        *db = nullptr;
+        *comp_error = const_cast<ch_compile_error_t *>(&ch_einternal);
+        return CH_COMPILER_ERROR;
+    }
+
+    DEBUG_PRINTF("success!\n");
+    return CH_SUCCESS;
+}
+
+extern "C" HS_PUBLIC_API
+ch_error_t HS_CDECL ch_compile_ext_multi(
+                                    const char *const *expressions,
+                                    const unsigned *flags,
+                                    const unsigned *ids,
+                                    unsigned elements, unsigned mode,
+                                    unsigned long int match_limit,
+                                    unsigned long int match_limit_recursion,
+                                    const hs_platform_info_t *platform,
+                                    ch_database_t **db,
+                                    ch_compile_error_t **comp_error) {
+    if (!comp_error) {
+        if (db) {
+            db = nullptr;
+        }
+        // nowhere to write the string, but we can still report an error code
+        return CH_COMPILER_ERROR;
+    }
+    if (!db) {
+        *comp_error =
+            generateChimeraCompileError("Invalid parameter: db is NULL", -1);
+        return CH_COMPILER_ERROR;
+    }
+    if (!expressions) {
+        *db = nullptr;
+        *comp_error =
+            generateChimeraCompileError("Invalid parameter: expressions is\
+                                         NULL", -1);
+        return CH_COMPILER_ERROR;
+    }
+    if (!elements) {
+        *db = nullptr;
+        *comp_error = generateChimeraCompileError("Invalid parameter:\
+                                                   elements is zero", -1);
+        return CH_COMPILER_ERROR;
+    }
+
+    if (!checkMode(mode, comp_error)) {
+        *db = nullptr;
+        assert(*comp_error); // set by checkMode
+        return CH_COMPILER_ERROR;
+    }
+
+    try {
+        // Internal function to do all the work, now that we've handled all the
+        // argument checking.
+        ch::ch_compile_multi_int(expressions, flags, ids, elements, mode,
+                                 match_limit, match_limit_recursion, platform,
+                                 db);
+    }
+    catch (const CompileError &e) {
+        // Compiler error occurred
+        *db = nullptr;
+        *comp_error = generateChimeraCompileError(e.reason, e.hasIndex ?
+                                                  (int)e.index : -1);
+        return CH_COMPILER_ERROR;
+    }
+    catch (std::bad_alloc) {
+        *db = nullptr;
+        *comp_error = const_cast<ch_compile_error_t *>(&ch_enomem);
+        return CH_COMPILER_ERROR;
+    }
+    catch (...) {
+        assert(!"Internal error, unexpected exception");
+        *db = nullptr;
+        *comp_error = const_cast<ch_compile_error_t *>(&ch_einternal);
+        return CH_COMPILER_ERROR;
+    }
+
+    DEBUG_PRINTF("success!\n");
+    return CH_SUCCESS;
+}
+
+extern "C" HS_PUBLIC_API
+ch_error_t HS_CDECL ch_free_compile_error(ch_compile_error_t *error) {
+    freeChimeraCompileError(error);
+    return CH_SUCCESS;
+}

chimera/ch_compile.h

@@ -0,0 +1,394 @@
+/*
+ * Copyright (c) 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.
+ */
+
+#ifndef CH_COMPILE_H_
+#define CH_COMPILE_H_
+
+/**
+ * @file
+ * @brief The Chimera compiler API definition.
+ *
+ * Chimera is a hybrid solution of Hyperscan and PCRE.
+ *
+ * This header contains functions for compiling regular expressions into
+ * Chimera databases that can be used by the Chimera runtime.
+ */
+
+#include "ch_common.h"
+#include "hs_compile.h"
+
+#ifdef __cplusplus
+extern "C"
+{
+#endif
+
+/**
+ * A type containing error details that is returned by the compile calls (@ref
+ * ch_compile() and @ref ch_compile_multi() on failure. The caller may inspect
+ * the values returned in this type to determine the cause of failure.
+ */
+typedef struct ch_compile_error {
+    /**
+     * A human-readable error message describing the error.
+     */
+    char *message;
+
+    /**
+     * The zero-based number of the expression that caused the error (if this
+     * can be determined). If the error is not specific to an expression, then
+     * this value will be less than zero.
+     */
+    int expression;
+} ch_compile_error_t;
+
+/**
+ * The basic regular expression compiler.
+ *
+ * This is the function call with which an expression is compiled into a
+ * Chimera database which can be passed to the runtime function (
+ * @ref ch_scan())
+ *
+ * @param expression
+ *      The NULL-terminated expression to parse. Note that this string must
+ *      represent ONLY the pattern to be matched, with no delimiters or flags;
+ *      any global flags should be specified with the @a flags argument. For
+ *      example, the expression `/abc?def/i` should be compiled by providing
+ *      `abc?def` as the @a expression, and @ref CH_FLAG_CASELESS as the @a
+ *      flags.
+ *
+ * @param flags
+ *      Flags which modify the behaviour of the expression. Multiple flags may
+ *      be used by ORing them together. Valid values are:
+ *       - CH_FLAG_CASELESS - Matching will be performed case-insensitively.
+ *       - CH_FLAG_DOTALL - Matching a `.` will not exclude newlines.
+ *       - CH_FLAG_MULTILINE - `^` and `$` anchors match any newlines in data.
+ *       - CH_FLAG_SINGLEMATCH - Only one match will be generated for the
+ *                               expression per stream.
+ *       - CH_FLAG_UTF8 - Treat this pattern as a sequence of UTF-8 characters.
+ *       - CH_FLAG_UCP - Use Unicode properties for character classes.
+ *
+ * @param mode
+ *      Compiler mode flag that affect the database as a whole for capturing
+ *      groups. One of  CH_MODE_NOGROUPS or  CH_MODE_GROUPS must be supplied.
+ *      See @ref CH_MODE_FLAG for more details.
+ *
+ * @param platform
+ *      If not NULL, the platform structure is used to determine the target
+ *      platform for the database. If NULL, a database suitable for running
+ *      on the current host platform is produced.
+ *
+ * @param db
+ *      On success, a pointer to the generated database will be returned in
+ *      this parameter, or NULL on failure. The caller is responsible for
+ *      deallocating the buffer using the @ref ch_free_database() function.
+ *
+ * @param compile_error
+ *      If the compile fails, a pointer to a @ref ch_compile_error_t will be
+ *      returned, providing details of the error condition. The caller is
+ *      responsible for deallocating the buffer using the @ref
+ *      ch_free_compile_error() function.
+ *
+ * @return
+ *      @ref CH_SUCCESS is returned on successful compilation; @ref
+ *      CH_COMPILER_ERROR on failure, with details provided in the error
+ *      parameter.
+ */
+ch_error_t HS_CDECL ch_compile(const char *expression, unsigned int flags,
+                               unsigned int mode,
+                               const hs_platform_info_t *platform,
+                               ch_database_t **db,
+                               ch_compile_error_t **compile_error);
+
+/**
+ * The multiple regular expression compiler.
+ *
+ * This is the function call with which a set of expressions is compiled into a
+ * database which can be passed to the runtime function (@ref ch_scan()).
+ * Each expression can be labelled with a unique integer which is passed into
+ * the match callback to identify the pattern that has matched.
+ *
+ * @param expressions
+ *      Array of NULL-terminated expressions to compile. Note that (as for @ref
+ *      ch_compile()) these strings must contain only the pattern to be
+ *      matched, with no delimiters or flags. For example, the expression
+ *      `/abc?def/i` should be compiled by providing `abc?def` as the first
+ *      string in the @a expressions array, and @ref CH_FLAG_CASELESS as the
+ *      first value in the @a flags array.
+ *
+ * @param flags
+ *      Array of flags which modify the behaviour of each expression. Multiple
+ *      flags may be used by ORing them together.  Specifying the NULL pointer
+ *      in place of an array will set the flags value for all patterns to zero.
+ *      Valid values are:
+ *       - CH_FLAG_CASELESS - Matching will be performed case-insensitively.
+ *       - CH_FLAG_DOTALL - Matching a `.` will not exclude newlines.
+ *       - CH_FLAG_MULTILINE - `^` and `$` anchors match any newlines in data.
+ *       - CH_FLAG_SINGLEMATCH - Only one match will be generated by patterns
+ *                               with this match id per stream.
+ *       - CH_FLAG_UTF8 - Treat this pattern as a sequence of UTF-8 characters.
+ *       - CH_FLAG_UCP - Use Unicode properties for character classes.
+ *
+ * @param ids
+ *      An array of integers specifying the ID number to be associated with the
+ *      corresponding pattern in the expressions array. Specifying the NULL
+ *      pointer in place of an array will set the ID value for all patterns to
+ *      zero.
+ *
+ * @param elements
+ *      The number of elements in the input arrays.
+ *
+ * @param mode
+ *      Compiler mode flag that affect the database as a whole for capturing
+ *      groups. One of  CH_MODE_NOGROUPS or  CH_MODE_GROUPS must be supplied.
+ *      See @ref CH_MODE_FLAG for more details.
+ *
+ * @param platform
+ *      If not NULL, the platform structure is used to determine the target
+ *      platform for the database. If NULL, a database suitable for running
+ *      on the current host platform is produced.
+ *
+ * @param db
+ *      On success, a pointer to the generated database will be returned in
+ *      this parameter, or NULL on failure. The caller is responsible for
+ *      deallocating the buffer using the @ref ch_free_database() function.
+ *
+ * @param compile_error
+ *      If the compile fails, a pointer to a @ref ch_compile_error_t will be
+ *      returned, providing details of the error condition. The caller is
+ *      responsible for deallocating the buffer using the @ref
+ *      ch_free_compile_error() function.
+ *
+ * @return
+ *      @ref CH_SUCCESS is returned on successful compilation; @ref
+ *      CH_COMPILER_ERROR on failure, with details provided in the @a error
+ *      parameter.
+ *
+ */
+ch_error_t HS_CDECL ch_compile_multi(const char *const *expressions,
+                                     const unsigned int *flags,
+                                     const unsigned int *ids,
+                                     unsigned int elements, unsigned int mode,
+                                     const hs_platform_info_t *platform,
+                                     ch_database_t **db,
+                                     ch_compile_error_t **compile_error);
+
+/**
+ * The multiple regular expression compiler with extended match limits support.
+ *
+ * This is the function call with which a set of expressions is compiled into a
+ * database in the same way as @ref ch_compile_multi(), but allows additional
+ * parameters to be specified via match_limit and match_limit_recursion to
+ * define match limits for PCRE runtime.
+ *
+ * @param expressions
+ *      Array of NULL-terminated expressions to compile. Note that (as for @ref
+ *      ch_compile()) these strings must contain only the pattern to be
+ *      matched, with no delimiters or flags. For example, the expression
+ *      `/abc?def/i` should be compiled by providing `abc?def` as the first
+ *      string in the @a expressions array, and @ref CH_FLAG_CASELESS as the
+ *      first value in the @a flags array.
+ *
+ * @param flags
+ *      Array of flags which modify the behaviour of each expression. Multiple
+ *      flags may be used by ORing them together.  Specifying the NULL pointer
+ *      in place of an array will set the flags value for all patterns to zero.
+ *      Valid values are:
+ *       - CH_FLAG_CASELESS - Matching will be performed case-insensitively.
+ *       - CH_FLAG_DOTALL - Matching a `.` will not exclude newlines.
+ *       - CH_FLAG_MULTILINE - `^` and `$` anchors match any newlines in data.
+ *       - CH_FLAG_SINGLEMATCH - Only one match will be generated by patterns
+ *                               with this match id per stream.
+ *       - CH_FLAG_UTF8 - Treat this pattern as a sequence of UTF-8 characters.
+ *       - CH_FLAG_UCP - Use Unicode properties for character classes.
+ *
+ * @param ids
+ *      An array of integers specifying the ID number to be associated with the
+ *      corresponding pattern in the expressions array. Specifying the NULL
+ *      pointer in place of an array will set the ID value for all patterns to
+ *      zero.
+ *
+ * @param elements
+ *      The number of elements in the input arrays.
+ *
+ * @param mode
+ *      Compiler mode flag that affect the database as a whole for capturing
+ *      groups. One of  CH_MODE_NOGROUPS or  CH_MODE_GROUPS must be supplied.
+ *      See @ref CH_MODE_FLAG for more details.
+ *
+ * @param match_limit
+ *      A limit from pcre_extra on the amount of match function called in PCRE
+ *      to limit backtracking that can take place.
+ *
+ * @param match_limit_recursion
+ *      A limit from pcre_extra on the recursion depth of match function
+ *      in PCRE.
+ *
+ * @param platform
+ *      If not NULL, the platform structure is used to determine the target
+ *      platform for the database. If NULL, a database suitable for running
+ *      on the current host platform is produced.
+ *
+ * @param db
+ *      On success, a pointer to the generated database will be returned in
+ *      this parameter, or NULL on failure. The caller is responsible for
+ *      deallocating the buffer using the @ref ch_free_database() function.
+ *
+ * @param compile_error
+ *      If the compile fails, a pointer to a @ref ch_compile_error_t will be
+ *      returned, providing details of the error condition. The caller is
+ *      responsible for deallocating the buffer using the @ref
+ *      ch_free_compile_error() function.
+ *
+ * @return
+ *      @ref CH_SUCCESS is returned on successful compilation; @ref
+ *      CH_COMPILER_ERROR on failure, with details provided in the @a error
+ *      parameter.
+ *
+ */
+ch_error_t HS_CDECL ch_compile_ext_multi(const char *const *expressions,
+                                         const unsigned int *flags,
+                                         const unsigned int *ids,
+                                         unsigned int elements,
+                                         unsigned int mode,
+                                         unsigned long int match_limit,
+                                         unsigned long int match_limit_recursion,
+                                         const hs_platform_info_t *platform,
+                                         ch_database_t **db,
+                                         ch_compile_error_t **compile_error);
+
+/**
+ * Free an error structure generated by @ref ch_compile(), @ref
+ * ch_compile_multi().
+ *
+ * @param error
+ *      The @ref ch_compile_error_t to be freed. NULL may also be safely
+ *      provided.
+ *
+ * @return
+ *      @ref CH_SUCCESS on success, other values on failure.
+ */
+ch_error_t HS_CDECL ch_free_compile_error(ch_compile_error_t *error);
+
+/**
+ * @defgroup CH_PATTERN_FLAG Pattern flags
+ *
+ * @{
+ */
+
+/**
+ * Compile flag: Set case-insensitive matching.
+ *
+ * This flag sets the expression to be matched case-insensitively by default.
+ * The expression may still use PCRE tokens (notably `(?i)` and
+ * `(?-i)`) to switch case-insensitive matching on and off.
+ */
+#define CH_FLAG_CASELESS        1
+
+/**
+ * Compile flag: Matching a `.` will not exclude newlines.
+ *
+ * This flag sets any instances of the `.` token to match newline characters as
+ * well as all other characters. The PCRE specification states that the `.`
+ * token does not match newline characters by default, so without this flag the
+ * `.` token will not cross line boundaries.
+ */
+#define CH_FLAG_DOTALL          2
+
+/**
+ * Compile flag: Set multi-line anchoring.
+ *
+ * This flag instructs the expression to make the `^` and `$` tokens match
+ * newline characters as well as the start and end of the stream. If this flag
+ * is not specified, the `^` token will only ever match at the start of a
+ * stream, and the `$` token will only ever match at the end of a stream within
+ * the guidelines of the PCRE specification.
+ */
+#define CH_FLAG_MULTILINE       4
+
+/**
+ * Compile flag: Set single-match only mode.
+ *
+ * This flag sets the expression's match ID to match at most once, only the
+ * first match for each invocation of @ref ch_scan() will be returned.
+ *
+ */
+#define CH_FLAG_SINGLEMATCH     8
+
+/**
+ * Compile flag: Enable UTF-8 mode for this expression.
+ *
+ * This flag instructs Chimera to treat the pattern as a sequence of UTF-8
+ * characters. The results of scanning invalid UTF-8 sequences with a Chimera
+ * library that has been compiled with one or more patterns using this flag are
+ * undefined.
+ */
+#define CH_FLAG_UTF8            32
+
+/**
+ * Compile flag: Enable Unicode property support for this expression.
+ *
+ * This flag instructs Chimera to use Unicode properties, rather than the
+ * default ASCII interpretations, for character mnemonics like `\w` and `\s` as
+ * well as the POSIX character classes. It is only meaningful in conjunction
+ * with @ref CH_FLAG_UTF8.
+ */
+#define CH_FLAG_UCP             64
+
+/** @} */
+
+/**
+ * @defgroup CH_MODE_FLAG Compile mode flags
+ *
+ * The mode flags are used as values for the mode parameter of the various
+ * compile calls (@ref ch_compile(), @ref ch_compile_multi().
+ *
+ * By default, the matcher will only supply the start and end offsets of the
+ * match when the match callback is called. Using mode flag @ref CH_MODE_GROUPS
+ * will also fill the `captured' array with the start and end offsets of all
+ * the capturing groups specified by the pattern that has matched.
+ *
+ * @{
+ */
+
+/**
+ * Compiler mode flag: Disable capturing groups.
+ */
+#define CH_MODE_NOGROUPS        0
+
+/**
+ * Compiler mode flag: Enable capturing groups.
+ */
+#define CH_MODE_GROUPS          1048576
+
+/** @} */
+
+#ifdef __cplusplus
+} /* extern "C" */
+#endif
+
+#endif /* CH_COMPILE_H_ */

chimera/ch_database.c

@@ -0,0 +1,126 @@
+/*
+ * Copyright (c) 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.
+ */
+
+/** \file
+ * \brief Chimera: database construction, etc.
+ */
+
+#include <limits.h>
+#include <stdio.h>
+#include <stdlib.h>
+#include <string.h>
+
+#include "allocator.h"
+#include "database.h"
+#include "hs.h"
+#include "ch.h"
+#include "hs_internal.h"
+#include "ch_common.h"
+#include "ch_alloc.h"
+#include "ch_database.h"
+#include "ch_internal.h"
+
+static really_inline
+int db_correctly_aligned(const void *db) {
+    return ISALIGNED_N(db, alignof(unsigned long long));
+}
+
+HS_PUBLIC_API
+ch_error_t HS_CDECL ch_free_database(ch_database_t *hydb) {
+    if (hydb && hydb->magic != CH_DB_MAGIC) {
+        return CH_INVALID;
+    }
+    ch_database_free(hydb);
+
+    return CH_SUCCESS;
+}
+
+HS_PUBLIC_API
+ch_error_t HS_CDECL ch_database_size(const ch_database_t *hydb, size_t *size) {
+    if (!size) {
+        return CH_INVALID;
+    }
+
+    ch_error_t ret = hydbIsValid(hydb);
+    if (unlikely(ret != CH_SUCCESS)) {
+        return ret;
+    }
+
+    *size = sizeof(struct ch_database) + hydb->length;
+    return CH_SUCCESS;
+}
+
+/** \brief Identifier prepended to database info. */
+static const char CHIMERA_IDENT[] = "Chimera ";
+
+HS_PUBLIC_API
+ch_error_t HS_CDECL ch_database_info(const ch_database_t *hydb, char **info) {
+    if (!info) {
+        return CH_INVALID;
+    }
+    *info = NULL;
+
+    if (!hydb || !db_correctly_aligned(hydb) || hydb->magic != CH_DB_MAGIC) {
+        return HS_INVALID;
+    }
+
+    const struct ch_bytecode *bytecode = ch_get_bytecode(hydb);
+    char noMulti = (bytecode->flags & CHIMERA_FLAG_NO_MULTIMATCH);
+    if (noMulti) {
+        size_t len = strlen(CHIMERA_IDENT);
+        *info = ch_misc_alloc(len + 1);
+        if (!(*info)) {
+            return CH_INVALID;
+        }
+        memcpy((*info), CHIMERA_IDENT, len);
+        (*info)[len] = '\0';
+        return CH_SUCCESS;
+    }
+
+    char *hsinfo = NULL;
+    hs_error_t ret = hs_database_info(getHyperscanDatabase(bytecode), &hsinfo);
+    if (ret != HS_SUCCESS) {
+        assert(!hsinfo);
+        return ret;
+    }
+
+    size_t hybridlen = strlen(CHIMERA_IDENT);
+    size_t hslen = strlen(hsinfo);
+    *info = ch_misc_alloc(hybridlen + hslen + 1);
+    if (!(*info)) {
+        ch_misc_free(hsinfo);
+        return CH_INVALID;
+    }
+
+    memcpy((*info), CHIMERA_IDENT, hybridlen);
+    memcpy((*info) + hybridlen, hsinfo, hslen);
+    (*info)[hybridlen + hslen] = '\0';
+    ch_misc_free(hsinfo);
+
+    return CH_SUCCESS;
+}

chimera/ch_database.h

@@ -0,0 +1,158 @@
+/*
+ * Copyright (c) 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.
+ */
+
+/** \file
+ * \brief Runtime code for ch_database manipulation.
+ */
+
+#ifndef CH_DATABASE_H_
+#define CH_DATABASE_H_
+
+#ifdef __cplusplus
+extern "C"
+{
+#endif
+
+#define PCRE_STATIC
+#include <pcre.h>
+
+#include "ch_compile.h" // for CH_MODE_ flags
+#include "ue2common.h"
+#include "hs_version.h"
+#include "hs.h"
+
+#define CH_DB_MAGIC 0xdedededeU //!< Magic number stored in \ref ch_database
+
+/** \brief Main Chimera database header. */
+struct ch_database {
+    u32 magic;     //!< must be \ref CH_DB_MAGIC
+    u32 version;   //!< release version
+    u32 length;    //!< total allocated length in bytes
+    u32 reserved0; //!< unused
+    u32 reserved1; //!< unused
+    u32 bytecode;  //!< offset relative to db start
+    u32 padding[16];  //!< padding for alignment of rest of bytecode
+    char bytes[];
+};
+
+/** \brief Chimera bytecode header, which follows the \ref ch_database and is
+ * always 64-byte aligned. */
+struct ch_bytecode {
+    u32 length; //!< length of bytecode including this header struct
+    u32 flags;          //!< whole-database flags (CHIMERA_FLAG_NO_MULTIMATCH,
+                        // CHIMERA_FLAG_GROUPS)
+    u32 patternCount;   //!< total number of patterns
+    u32 activeSize;     //!< size of mmbit to store active pattern ids
+    u32 databaseOffset; //!< offset for database following \ref ch_bytecode
+                        // header
+    u32 patternOffset;  //!< points to an array of u32 offsets, each pointing to
+                        // a \ref ch_pattern
+    u32 unguardedOffset;  //!< pointer to a list of unguarded pattern indices
+    u32 unguardedCount;   //!< number of unguarded patterns
+    u32 maxCaptureGroups; //!< max number of capture groups used by any pattern
+};
+
+/** \brief Per-pattern header.
+ *
+ * struct is followed in bytecode by:
+ * 1. pcre bytecode (always present)
+ * 2. pcre study data (sometimes)
+ */
+struct ch_pattern {
+    u32 id;        //!< pattern ID to report to the user
+    u32 flags;     //!< per-pattern flags (e.g. \ref CHIMERA_PATTERN_FLAG_UTF8)
+    u32 maxWidth;  //!< maximum width of a match, or UINT_MAX for inf.
+    u32 minWidth;  //!< minimum width of a match.
+    u32 fixedWidth;//!< pattern has fixed width.
+    u32 studyOffset;     //!< offset relative to struct start of study data,
+                         // or zero if there is none
+    u32 length; //!< length of struct plus pcre bytecode and study data
+    pcre_extra extra; //!< pcre_extra struct, used to store study data ptr for
+                      // the currently-running pcre at runtime.
+};
+
+static really_inline
+const void *ch_get_bytecode(const struct ch_database *db) {
+    assert(db);
+    const void *bytecode = (const char *)db + db->bytecode;
+    assert(ISALIGNED_16(bytecode));
+    return bytecode;
+}
+
+struct hs_database;
+
+static really_inline
+const struct hs_database *getHyperscanDatabase(const struct ch_bytecode *db) {
+    assert(db);
+    const char *ptr = (const char *)db;
+    const struct hs_database *hs_db;
+    hs_db = (const struct hs_database *)(ptr + db->databaseOffset);
+    assert(ISALIGNED_CL(hs_db));
+    return hs_db;
+}
+
+static really_inline
+const u32 *getUnguarded(const struct ch_bytecode *db) {
+    assert(db);
+    const char *ptr = (const char *)db;
+    const u32 *unguarded = (const u32 *)(ptr + db->unguardedOffset);
+    assert(ISALIGNED_N(unguarded, sizeof(u32)));
+    return unguarded;
+}
+
+static really_inline
+const struct ch_pattern *getPattern(const struct ch_bytecode *db, u32 i) {
+    assert(db);
+    assert(i < db->patternCount);
+    const char *ptr = (const char *)db;
+    const u32 *patternOffset = (const u32 *)(ptr + db->patternOffset);
+    assert(patternOffset[i] < db->length);
+    return (const struct ch_pattern *)(ptr + patternOffset[i]);
+}
+
+static really_inline
+ch_error_t hydbIsValid(const struct ch_database *hydb) {
+    if (!hydb || hydb->magic != CH_DB_MAGIC) {
+        DEBUG_PRINTF("bad magic (%u != %u)\n", hydb->magic, CH_DB_MAGIC);
+        return CH_INVALID;
+    }
+
+    if (hydb->version != HS_VERSION_32BIT) {
+        DEBUG_PRINTF("bad version\n");
+        return CH_DB_VERSION_ERROR;
+    }
+
+    return CH_SUCCESS;
+}
+
+#ifdef __cplusplus
+} /* extern "C" */
+#endif
+
+#endif /* CH_DATABASE_H_ */
+

chimera/ch_internal.h

@@ -0,0 +1,44 @@
+/*
+ * Copyright (c) 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.
+ */
+
+/** \file
+ * \brief Chimera: data structures and internals.
+ */
+
+#ifndef CH_INTERNAL_H
+#define CH_INTERNAL_H
+
+#define CHIMERA_FLAG_NO_MULTIMATCH 1 //!< Don't run a multimatch scan
+#define CHIMERA_FLAG_GROUPS        2 //!< Return capturing groups
+#define CHIMERA_FLAG_ALL_CONFIRM   4 //!< All patterns need confirm
+#define CHIMERA_FLAG_ALL_SINGLE    8 //!< All patterns need only one match
+
+#define CHIMERA_PATTERN_FLAG_SINGLEMATCH    1 //!< only report the first match
+#define CHIMERA_PATTERN_FLAG_UTF8           2 //!< pattern is in UTF-8 mode
+
+#endif

chimera/ch_runtime.c

@@ -0,0 +1,629 @@
+/*
+ * Copyright (c) 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.
+ */
+
+/** \file
+ * \brief Chimera: main runtime.
+ */
+
+#include <limits.h>
+#include <stdio.h>
+#include <stdlib.h>
+#include <string.h>
+
+#include "ch.h"
+#include "hs.h"
+#include "hs_internal.h"
+#include "ue2common.h"
+#include "ch_database.h"
+#include "ch_internal.h"
+#include "ch_scratch.h"
+#include "util/multibit.h"
+#include "util/unicode_def.h"
+
+typedef struct queue_item PQ_T;
+
+static
+char PQ_COMP(PQ_T *pqc_items, int a, int b) {
+    if ((pqc_items)[a].to != (pqc_items)[b].to) {
+        return (pqc_items)[a].to < (pqc_items)[b].to;
+    } else if ((pqc_items)[a].from != (pqc_items)[b].from) {
+        return (pqc_items)[a].from < (pqc_items)[b].from;
+    } else {
+        return (pqc_items)[a].id < (pqc_items)[b].id;
+    }
+}
+
+static
+char PQ_COMP_B(PQ_T *pqc_items, int a, PQ_T b_fixed) {
+    if ((pqc_items)[a].to != (b_fixed).to) {
+        return (pqc_items)[a].to < (b_fixed).to;
+    } else if ((pqc_items)[a].from != (b_fixed).from) {
+        return (pqc_items)[a].from < (b_fixed).from;
+    } else {
+        return (pqc_items)[a].id < b_fixed.id;
+    }
+}
+
+#include "util/pqueue.h"
+
+static really_inline
+void pq_insert_with(struct match_pq *pq, int from, int to, u32 id) {
+    DEBUG_PRINTF("inserting pattern%u in pq at %u\n", id, to);
+    struct queue_item temp = {
+        .from = from,
+        .to = to,
+        .id = id,
+    };
+
+    pq_insert(pq->item, pq->size, temp);
+    ++pq->size;
+}
+
+static really_inline
+void pq_pop_nice(struct match_pq *pq) {
+    pq_pop(pq->item, pq->size);
+    pq->size--;
+}
+
+/** dummy event handler for use when user does not provide one */
+static
+int null_onEvent(UNUSED unsigned id, UNUSED unsigned long long from,
+                 UNUSED unsigned long long to, UNUSED unsigned flags,
+                 UNUSED unsigned size, UNUSED const ch_capture_t *captured,
+                 UNUSED void *ctxt) {
+    return 0;
+}
+
+/** \brief Chimera runtime context. */
+struct HybridContext {
+    const char *data; //!< buffer being scanned
+    u32 length; //!< length of data buffer
+    u32 valid_utf8_highwater; //!< UTF-8 has been validated up to here.
+    const struct ch_bytecode *db;
+    struct ch_scratch *scratch;
+    struct match_pq *pq;
+    /** \brief user-supplied match callback */
+    int (*match_callback)(unsigned int id, unsigned long long from,
+                          unsigned long long to, unsigned int flags,
+                          unsigned int size, const ch_capture_t *capture,
+                          void *ctx);
+    /** \brief user-supplied error callback */
+    int (*error_callback)(ch_error_event_t error_type, unsigned int id,
+                          void *info, void *ctx);
+    /** \brief user-supplied context */
+    void *context;
+};
+
+// Internal PCRE func.
+extern int _pcre_valid_utf(const unsigned char *, int, int *);
+
+/** UTF-8 validity check. Returns >0 if the given region of the data is valid
+ * UTF-8, 0 otherwise. */
+static
+char isValidUTF8(struct HybridContext *hyctx, u32 end) {
+    assert(hyctx);
+
+    if (hyctx->valid_utf8_highwater >= end) {
+        return 1; // Already validated.
+    }
+
+    const unsigned char *data =
+        (const unsigned char *)hyctx->data + hyctx->valid_utf8_highwater;
+    int validate_len = end - hyctx->valid_utf8_highwater;
+
+    DEBUG_PRINTF("validating %d bytes\n", validate_len);
+
+    int erroroffset = 0;
+    if (_pcre_valid_utf(data, validate_len, &erroroffset)) {
+        DEBUG_PRINTF("UTF8 invalid at offset %d\n", erroroffset);
+        return 0;
+    }
+
+    hyctx->valid_utf8_highwater = end;
+    return 1;
+}
+
+static
+const pcre *getPcre(const struct ch_pattern *pattern) {
+    const char *ptr = (const char *)pattern;
+    const pcre *p = (const pcre *)(ptr + ROUNDUP_N(sizeof(*pattern), 8));
+    assert(ISALIGNED_N(p, 8));
+    return p;
+}
+
+/** \brief Fill the Chimera groups array from a pcre_exec ovector. */
+static
+void fillGroupsFromOvector(ch_capture_t *groups, int numPairs, int *ovector) {
+    assert(groups);
+    assert(ISALIGNED_N(groups, alignof(ch_capture_t)));
+
+    DEBUG_PRINTF("filling %d groups (@ %p) from pcre ovector\n",
+                 numPairs, groups);
+
+    for (int i = 0; i < numPairs * 2; i += 2) {
+        if (ovector[i] == -1) {
+            groups->flags = CH_CAPTURE_FLAG_INACTIVE;
+        } else {
+            groups->flags = CH_CAPTURE_FLAG_ACTIVE;
+            assert(ovector[i] <= ovector[i + 1]);
+            groups->from = ovector[i];
+            groups->to = ovector[i + 1];
+        }
+        ++groups;
+    }
+}
+
+static
+ch_error_t handlePcreNonMatch(const struct ch_pattern *pattern, int rv,
+                              ch_error_event_handler onError,
+                              void *userContext) {
+    assert(rv < 0);
+
+    if (rv == PCRE_ERROR_NOMATCH) {
+        DEBUG_PRINTF("no match found by libpcre\n");
+        return CH_SUCCESS;
+    } else if (rv == PCRE_ERROR_MATCHLIMIT) {
+        DEBUG_PRINTF("pcre hit match limit\n");
+        if (onError) {
+            return onError(CH_ERROR_MATCHLIMIT, pattern->id, NULL,
+                           userContext);
+        }
+        return CH_SUCCESS;
+    } else if (rv == PCRE_ERROR_RECURSIONLIMIT) {
+        DEBUG_PRINTF("pcre hit recursion limit\n");
+        if (onError) {
+            return onError(CH_ERROR_RECURSIONLIMIT, pattern->id, NULL,
+                           userContext);
+        }
+        return CH_SUCCESS;
+    }
+
+    // All other errors not handled above are fatal.
+    return CH_FAIL_INTERNAL;
+}
+
+static
+ch_error_t scanPcre(struct HybridContext *hyctx, UNUSED unsigned int length,
+                    unsigned int offset, u32 id) {
+    const char *data = hyctx->data;
+    unsigned int full_length = hyctx->length;
+    ch_error_event_handler onError = hyctx->error_callback;
+    void *userContext = hyctx->context;
+
+    const struct ch_pattern *pattern = getPattern(hyctx->db, id);
+    const pcre *p = getPcre(pattern);
+
+    // Set up the PCRE extra block.
+    const pcre_extra *extra = &pattern->extra;
+
+    int startoffset = offset;
+
+    int *ovector = hyctx->scratch->ovector;
+    int ovectorSize = (hyctx->scratch->maxCaptureGroups + 1) * 3;
+    assert(ovectorSize >= 2);
+
+    DEBUG_PRINTF("scanning %u bytes, pattern %u, startoffset %d\n",
+                 length, id, startoffset);
+
+    int options = 0;
+    if (pattern->flags & CHIMERA_PATTERN_FLAG_UTF8) {
+        // We do our own UTF-8 validation.
+        options |= PCRE_NO_UTF8_CHECK;
+        if (!isValidUTF8(hyctx, full_length)) {
+            return handlePcreNonMatch(pattern, PCRE_ERROR_BADUTF8, onError,
+                                      userContext);
+        }
+    }
+
+    int rv = pcre_exec(p, extra, data, full_length, startoffset, options,
+                       ovector, ovectorSize);
+
+    DEBUG_PRINTF("pcre return code is %d\n", rv);
+
+    // Handle all non-match or error cases, all of which involve us
+    // terminating the loop.
+    if (rv < 0) {
+        return handlePcreNonMatch(pattern, rv, onError, userContext);
+    }
+
+    // We've found a match, and we should always have room for at least the
+    // start and end offsets in our ovector. Pass this info to the user.
+    assert(rv >= 1);
+    assert(rv < ovectorSize);
+    int from = ovector[0];
+    int to = ovector[1];
+    DEBUG_PRINTF("match %d -> %d\n", from, to);
+
+    struct ch_patterndata *pd = hyctx->scratch->patternData + id;
+
+    if (hyctx->db->flags & CHIMERA_FLAG_GROUPS) {
+        fillGroupsFromOvector(pd->match, rv, ovector);
+    } else {
+        rv = 0;
+    }
+    pd->groupCount = (u32)rv;
+
+    // Insert new matched item to the queue
+    pq_insert_with(hyctx->pq, from, to, id);
+
+    // Next scan starts at the first codepoint after the match.  It's
+    // possible that we have a vacuous match, in which case we must step
+    // past it to ensure that we always progress.
+    if (from != to) {
+        startoffset = to;
+    } else if (pattern->flags & CHIMERA_PATTERN_FLAG_UTF8) {
+        startoffset = to + 1;
+        while (startoffset < (int)full_length &&
+               ((data[startoffset] & 0xc0) == UTF_CONT_BYTE_HEADER)) {
+            ++startoffset;
+        }
+    } else {
+        startoffset = to + 1;
+    }
+
+    pd->scanStart = startoffset;
+    DEBUG_PRINTF("new offset %u\n", pd->scanStart);
+
+    return CH_SUCCESS;
+}
+
+static
+ch_error_t catchupPcre(struct HybridContext *hyctx, unsigned int id,
+                       unsigned long long from, unsigned long long to) {
+    ch_match_event_handler onEvent = hyctx->match_callback;
+    void *userContext = hyctx->context;
+    DEBUG_PRINTF("priority queue size %u\n", hyctx->pq->size);
+    while (hyctx->pq->size) {
+        u32 num_item = hyctx->pq->size;
+        struct queue_item *item = pq_top(hyctx->pq->item);
+        size_t top_from = item->from;
+        size_t top_to = item->to;
+        u32 top_id = item->id;
+
+        if (top_to > to) {
+            pq_insert_with(hyctx->pq, from, to, id);
+            break;
+        }
+        pq_pop_nice(hyctx->pq);
+
+        const struct ch_pattern *pattern = getPattern(hyctx->db, top_id);
+        struct ch_patterndata *pd = hyctx->scratch->patternData + top_id;
+
+        // Report match for pattern
+        DEBUG_PRINTF("trigger match@%zu\n", top_to);
+        ch_callback_t cbrv =
+            onEvent(pattern->id, top_from, top_to, 0 /* flags */,
+                    pd->groupCount, pd->match, userContext);
+
+        if (cbrv == CH_CALLBACK_TERMINATE) {
+            DEBUG_PRINTF("user callback told us to terminate scanning\n");
+            return CH_SCAN_TERMINATED;
+        } else if (cbrv == CH_CALLBACK_SKIP_PATTERN) {
+            DEBUG_PRINTF("user callback told us to skip this pattern\n");
+            pd->scanStart = hyctx->length;
+        }
+
+        if (top_id == id) {
+            break;
+        }
+
+        // Push a new match to replace the old one
+        unsigned int start = pd->scanStart;
+        unsigned int len = hyctx->length - pd->scanStart;
+        if (hyctx->length >= pd->scanStart &&
+            !(pattern->flags & CHIMERA_PATTERN_FLAG_SINGLEMATCH)) {
+            DEBUG_PRINTF("get a new match item\n");
+            int ret = scanPcre(hyctx, len, start, top_id);
+
+            if (ret == CH_CALLBACK_TERMINATE) {
+                DEBUG_PRINTF("user callback told us to terminate scanning\n");
+                return CH_SCAN_TERMINATED;
+            } else if (ret == CH_CALLBACK_SKIP_PATTERN) {
+                DEBUG_PRINTF("user callback told us to skip this pattern\n");
+                pd->scanStart = hyctx->length;
+                ret = CH_SUCCESS;
+            } else if (ret == CH_FAIL_INTERNAL) {
+                return ret;
+            }
+
+            // No further match is found
+            if (hyctx->pq->size == num_item - 1) {
+                pd->scanStart = hyctx->length;
+            }
+        }
+    }
+
+    return CH_SUCCESS;
+}
+
+/** \brief Callback used for internal Hyperscan multi-matcher. */
+static
+int multiCallback(unsigned int id, unsigned long long from,
+                  unsigned long long to, UNUSED unsigned int flags,
+                  void *ctx) {
+    assert(ctx);
+    struct HybridContext *hyctx = ctx;
+
+    DEBUG_PRINTF("match for ID %u at offset %llu\n", id, to);
+    assert(id < hyctx->db->patternCount);
+
+    const struct ch_pattern *pattern = getPattern(hyctx->db, id);
+    struct ch_patterndata *pd = hyctx->scratch->patternData + id;
+    char needConfirm = pattern->fixedWidth == ~0U;
+
+    if (needConfirm &&
+        mmbit_isset(hyctx->scratch->active, hyctx->db->patternCount, id)) {
+        if ((hyctx->db->flags & CHIMERA_FLAG_ALL_CONFIRM) &&
+             mmbit_all(hyctx->scratch->active, hyctx->db->patternCount)) {
+            return 1;
+        }
+        return 0;
+    }
+    // Store the fact that we've seen this bit.
+    char already = mmbit_set(hyctx->scratch->active,
+                             hyctx->db->patternCount, id);
+    DEBUG_PRINTF("match from %u to %llu\n", pd->scanStart, to);
+
+    if (!already) {
+        pd->scanStart = 0;
+    } else if (to < pd->scanStart + pattern->minWidth) {
+        return 0;
+    } else if (pattern->flags & CHIMERA_PATTERN_FLAG_SINGLEMATCH) {
+        if ((hyctx->db->flags & CHIMERA_FLAG_ALL_SINGLE) &&
+             mmbit_all(hyctx->scratch->active, hyctx->db->patternCount)) {
+            return 1;
+        }
+        // Note: we may have unordered match from Hyperscan,
+        // thus possibly get to < pd->scanStart.
+        return 0;
+    }
+
+    int ret = HS_SUCCESS;
+    unsigned int start = pd->scanStart;
+    unsigned int len = hyctx->length - pd->scanStart;
+    assert(hyctx->length >= pd->scanStart);
+    const char *data = hyctx->data;
+    if (needConfirm) {
+        DEBUG_PRINTF("run confirm for the first time\n");
+        ret = scanPcre(hyctx, len, start, id);
+        hyctx->scratch->ret = ret;
+        if (ret == CH_CALLBACK_TERMINATE) {
+            DEBUG_PRINTF("user callback told us to terminate scanning\n");
+            return HS_SCAN_TERMINATED;
+        } else if (ret == CH_CALLBACK_SKIP_PATTERN) {
+            DEBUG_PRINTF("user callback told us to skip this pattern\n");
+            pd->scanStart = hyctx->length;
+            ret = HS_SUCCESS;
+        } else if (ret == CH_FAIL_INTERNAL) {
+            return ret;
+        }
+    } else {
+        if (already) {
+            DEBUG_PRINTF("catch up with new matches\n");
+            ret = catchupPcre(hyctx, id, from, to);
+
+            hyctx->scratch->ret = ret;
+            if (pd->scanStart >= hyctx->length) {
+                return ret;
+            }
+        }
+        int startoffset = 0;
+        // Next scan starts at the first codepoint after the match.  It's
+        // possible that we have a vacuous match, in which case we must step
+        // past it to ensure that we always progress.
+        if (from != to) {
+            startoffset = to;
+        } else if (pattern->flags & CHIMERA_PATTERN_FLAG_UTF8) {
+            startoffset = to + 1;
+            while (startoffset < (int)hyctx->length &&
+                   ((data[startoffset] & 0xc0) == UTF_CONT_BYTE_HEADER)) {
+                ++startoffset;
+            }
+        } else {
+            startoffset = to + 1;
+        }
+        pd->scanStart = startoffset;
+        int rv = 0;
+        if (hyctx->db->flags & CHIMERA_FLAG_GROUPS) {
+            ch_capture_t *groups = pd->match;
+            groups->flags = CH_CAPTURE_FLAG_ACTIVE;
+            groups->from = from;
+            groups->to = to;
+            rv = 1;
+        }
+        pd->groupCount = (u32)rv;
+        pq_insert_with(hyctx->pq, from, to, id);
+    }
+
+    return ret;
+}
+
+static
+hs_error_t scanHyperscan(struct HybridContext *hyctx, const char *data,
+                         unsigned int length) {
+    DEBUG_PRINTF("scanning %u bytes with Hyperscan\n", length);
+    const struct ch_bytecode *hydb = hyctx->db;
+    const hs_database_t *db = getHyperscanDatabase(hydb);
+    hs_scratch_t *scratch = hyctx->scratch->multi_scratch;
+
+    hs_error_t err = hs_scan(db, data, length, 0, scratch, multiCallback,
+                             hyctx);
+
+    return err;
+}
+
+/** \brief Init match priority queue.
+ *
+ * Add a first match offset for each pattern that is not supported by Hyperscan
+ * with prefiltering.
+ */
+static really_inline
+ch_error_t initQueue(struct HybridContext *hyctx, struct match_pq *pq) {
+    const struct ch_bytecode *db = hyctx->db;
+
+    u8 *active = hyctx->scratch->active;
+    mmbit_clear(active, db->patternCount);
+
+    // Init match queue size
+    pq->size = 0;
+
+    unsigned int length = hyctx->length;
+    const u32 *unguarded = getUnguarded(db);
+    for (u32 i = 0; i < db->unguardedCount; i++) {
+        u32 patternId = unguarded[i];
+        DEBUG_PRINTF("switch on unguarded pcre %u\n", patternId);
+        mmbit_set(active, db->patternCount, patternId);
+
+        DEBUG_PRINTF("get a new match item\n");
+        int ret = scanPcre(hyctx, length, 0, patternId);
+
+        struct ch_patterndata *pd = hyctx->scratch->patternData + patternId;
+        if (ret == CH_CALLBACK_TERMINATE) {
+            DEBUG_PRINTF("user callback told us to terminate scanning\n");
+            return CH_SCAN_TERMINATED;
+        } else if (ret == CH_CALLBACK_SKIP_PATTERN) {
+            DEBUG_PRINTF("user callback told us to skip this pattern\n");
+            pd->scanStart = length;
+            ret = CH_SUCCESS;
+        } else if (ret == CH_FAIL_INTERNAL) {
+            return ret;
+        }
+    }
+
+    return CH_SUCCESS;
+}
+
+static really_inline
+ch_error_t ch_scan_i(const ch_database_t *hydb,
+                     const char *data, unsigned int length,
+                     UNUSED unsigned int flags,
+                     ch_scratch_t *scratch,
+                     ch_match_event_handler onEvent,
+                     ch_error_event_handler onError,
+                     void *userContext) {
+    if (unlikely(!hydb || !scratch || !data)) {
+        DEBUG_PRINTF("args invalid\n");
+        return CH_INVALID;
+    }
+    ch_error_t ret = hydbIsValid(hydb);
+    if (ret != CH_SUCCESS) {
+        DEBUG_PRINTF("database invalid\n");
+        return ret;
+    }
+
+    if (!ISALIGNED_CL(scratch)) {
+        DEBUG_PRINTF("bad alignment %p\n", scratch);
+        return CH_INVALID;
+    }
+
+    if (scratch->magic != CH_SCRATCH_MAGIC) {
+        DEBUG_PRINTF("scratch invalid\n");
+        return CH_INVALID;
+    }
+
+    if (unlikely(markScratchInUse(scratch))) {
+        return CH_SCRATCH_IN_USE;
+    }
+
+    // Hyperscan underlying scratch and database validity will be checked by
+    // the hs_scan() call, so no need to do it here.
+
+    // PCRE takes the data region length in as an int, so this limits our block
+    // size to INT_MAX.
+    if (length > INT_MAX) {
+        DEBUG_PRINTF("length invalid\n");
+        unmarkScratchInUse(scratch);
+        return CH_INVALID;
+    }
+
+    const struct ch_bytecode *db = ch_get_bytecode(hydb);
+
+    scratch->pq.size = 0;
+    scratch->ret = CH_SUCCESS;
+
+    // Firstly, we run Hyperscan in block mode and add its matches into the
+    // active list for subsequent confirmation with pcre.
+    struct HybridContext hyctx = {
+        .data = data,
+        .length = length,
+        .valid_utf8_highwater = 0,
+        .db = db,
+        .scratch = scratch,
+        .pq = &scratch->pq,
+        .match_callback = onEvent ? onEvent : null_onEvent,
+        .error_callback = onError,
+        .context = userContext
+    };
+
+    // Init priority queue.
+    ret = initQueue(&hyctx, &scratch->pq);
+    if (ret != CH_SUCCESS) {
+        DEBUG_PRINTF("Chimera returned error %d\n", ret);
+        unmarkScratchInUse(scratch);
+        return ret;
+    }
+
+    if (!(db->flags & CHIMERA_FLAG_NO_MULTIMATCH)) {
+        ret = scanHyperscan(&hyctx, data, length);
+        if (ret != HS_SUCCESS && scratch->ret != CH_SUCCESS) {
+            DEBUG_PRINTF("Hyperscan returned error %d\n", scratch->ret);
+            unmarkScratchInUse(scratch);
+            return scratch->ret;
+        }
+    }
+
+    DEBUG_PRINTF("Flush priority queue\n");
+    // Catch up with PCRE and make up id and offsets as we don't really care
+    // about their values
+    ret = catchupPcre(&hyctx, ~0U, length, length);
+    if (ret != CH_SUCCESS) {
+        DEBUG_PRINTF("PCRE catch up returned error %d\n", ret);
+        unmarkScratchInUse(scratch);
+        return ret;
+    }
+
+    unmarkScratchInUse(scratch);
+    return CH_SUCCESS;
+}
+
+HS_PUBLIC_API
+ch_error_t HS_CDECL ch_scan(const ch_database_t *hydb, const char *data,
+                            unsigned int length, unsigned int flags,
+                            ch_scratch_t *scratch,
+                            ch_match_event_handler onEvent,
+                            ch_error_event_handler onError, void *userContext) {
+    ch_error_t ret = ch_scan_i(hydb, data, length, flags, scratch, onEvent,
+                               onError, userContext);
+
+    return ret;
+}
+
+HS_PUBLIC_API
+const char * HS_CDECL ch_version(void) {
+    return HS_VERSION_STRING;
+}

chimera/ch_runtime.h

@@ -0,0 +1,377 @@
+/*
+ * Copyright (c) 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.
+ */
+
+#ifndef CH_RUNTIME_H_
+#define CH_RUNTIME_H_
+
+#include <stdlib.h>
+
+/**
+ * @file
+ * @brief The Chimera runtime API definition.
+ *
+ * Chimera is a hybrid of Hyperscan and PCRE regular expression engine.
+ *
+ * This header contains functions for using compiled Chimera databases for
+ * scanning data at runtime.
+ */
+
+#include "hs_common.h"
+
+#ifdef __cplusplus
+extern "C"
+{
+#endif
+
+struct ch_scratch;
+
+/**
+ * A Chimera scratch space.
+ */
+typedef struct ch_scratch ch_scratch_t;
+
+/**
+ * Callback return value used to tell the Chimera matcher what to do after
+ * processing this match.
+ */
+typedef int ch_callback_t;
+
+/**
+ * @defgroup CH_CALLBACK ch_callback_t values
+ *
+ * @{
+ */
+
+/**
+ * Continue matching.
+ */
+#define CH_CALLBACK_CONTINUE     0
+
+/**
+ * Terminate matching.
+ */
+#define CH_CALLBACK_TERMINATE    1
+
+/**
+ * Skip remaining matches for this ID and continue.
+ */
+#define CH_CALLBACK_SKIP_PATTERN 2
+
+
+/** @} */
+
+
+/**
+ * Type used to differentiate the errors raised with the @ref
+ * ch_error_event_handler callback.
+ */
+typedef int ch_error_event_t;
+
+/**
+ * @defgroup CH_ERROR_EVENT ch_error_event_t values
+ *
+ * @{
+ */
+
+/**
+ * PCRE hits its match limit and reports PCRE_ERROR_MATCHLIMIT.
+ */
+#define CH_ERROR_MATCHLIMIT      1
+
+/**
+ * PCRE hits its recursion limit and reports PCRE_ERROR_RECURSIONLIMIT.
+ */
+#define CH_ERROR_RECURSIONLIMIT  2
+
+/** @} */
+
+/**
+ * Structure representing a captured subexpression within a match. An array of
+ * these structures corresponding to capture groups in order is passed to the
+ * callback on match, with active structures identified by the
+ * CH_CAPTURE_FLAG_ACTIVE flag.
+ */
+typedef struct ch_capture {
+    /**
+     * The flags indicating if this structure is active.
+     */
+    unsigned int flags;
+
+    /**
+     * offset at which this capture group begins.
+     */
+    unsigned long long from; /*< offset at which this capture group begins. */
+
+    /**
+     * offset at which this capture group ends.
+     */
+    unsigned long long to;
+} ch_capture_t;
+
+/**
+ * @defgroup CH_CAPTURE ch_capture_t flags
+ *
+ * These flags are used in @ref ch_capture_t::flags to indicate if this
+ * structure is active.
+ *
+ * @{
+ */
+
+/**
+ * Flag indicating that a particular capture group is inactive, used in @ref
+ * ch_capture_t::flags.
+ */
+#define CH_CAPTURE_FLAG_INACTIVE      0
+
+/**
+ * Flag indicating that a particular capture group is active, used in @ref
+ * ch_capture_t::flags.
+ */
+#define CH_CAPTURE_FLAG_ACTIVE      1
+
+/** @} */
+
+/**
+ * Definition of the match event callback function type.
+ *
+ * A callback function matching the defined type must be provided by the
+ * application calling the @ref ch_scan()
+ *
+ * This callback function will be invoked whenever a match is located in the
+ * target data during the execution of a scan. The details of the match are
+ * passed in as parameters to the callback function, and the callback function
+ * should return a value indicating whether or not matching should continue on
+ * the target data. If no callbacks are desired from a scan call, NULL may be
+ * provided in order to suppress match production.
+ *
+ * @param id
+ *      The ID number of the expression that matched. If the expression was a
+ *      single expression compiled with @ref ch_compile(), this value will be
+ *      zero.
+ *
+ * @param from
+ *      The offset of the first byte that matches the expression.
+ *
+ * @param to
+ *      The offset after the last byte that matches the expression.
+ *
+ * @param flags
+ *      This is provided for future use and is unused at present.
+ *
+ * @param size
+ *      The number of valid entries pointed to by the captured parameter.
+ *
+ * @param captured
+ *      A pointer to an array of @ref ch_capture_t structures that
+ *      contain the start and end offsets of entire pattern match and
+ *      each captured subexpression.
+ *
+ * @param ctx
+ *      The pointer supplied by the user to the @ref ch_scan() function.
+ *
+ * @return
+ *      The callback can return @ref CH_CALLBACK_TERMINATE to stop matching.
+ *      Otherwise, a return value of @ref CH_CALLBACK_CONTINUE will continue,
+ *      with the current pattern if configured to produce multiple matches per
+ *      pattern, while a return value of @ref CH_CALLBACK_SKIP_PATTERN will
+ *      cease matching this pattern but continue matching the next pattern.
+ */
+typedef ch_callback_t (*ch_match_event_handler)(unsigned int id,
+                                                unsigned long long from,
+                                                unsigned long long to,
+                                                unsigned int flags,
+                                                unsigned int size,
+                                                const ch_capture_t *captured,
+                                                void *ctx);
+
+/**
+ * Definition of the Chimera error event callback function type.
+ *
+ * A callback function matching the defined type may be provided by the
+ * application calling the @ref ch_scan function. This callback function
+ * will be invoked when an error event occurs during matching; this indicates
+ * that some matches for a given expression may not be reported.
+ *
+ * @param error_type
+ *      The type of error event that occurred. Currently these errors
+ *      correspond to resource limits on PCRE backtracking
+ *      @ref CH_ERROR_MATCHLIMIT and @ref CH_ERROR_RECURSIONLIMIT.
+ *
+ * @param id
+ *      The ID number of the expression that matched.
+ *
+ * @param info
+ *      Event-specific data, for future use. Currently unused.
+ *
+ * @param ctx
+ *      The context pointer supplied by the user to the @ref ch_scan
+ *      function.
+ *
+ * @return
+ *      The callback can return @ref CH_CALLBACK_SKIP_PATTERN to cease matching this
+ *      pattern but continue matching the next pattern. Otherwise, we stop
+ *      matching for all patterns with @ref CH_CALLBACK_TERMINATE.
+ */
+ typedef ch_callback_t (*ch_error_event_handler)(ch_error_event_t error_type,
+                                                 unsigned int id, void *info,
+                                                 void *ctx);
+
+/**
+ * The block regular expression scanner.
+ *
+ * This is the function call in which the actual pattern matching takes place
+ * for block-mode pattern databases.
+ *
+ * @param db
+ *      A compiled pattern database.
+ *
+ * @param data
+ *      Pointer to the data to be scanned.
+ *
+ * @param length
+ *      The number of bytes to scan.
+ *
+ * @param flags
+ *      Flags modifying the behaviour of this function. This parameter is
+ *      provided for future use and is unused at present.
+ *
+ * @param scratch
+ *      A per-thread scratch space allocated by @ref ch_alloc_scratch() for this
+ *      database.
+ *
+ * @param onEvent
+ *      Pointer to a match event callback function. If a NULL pointer is given,
+ *      no matches will be returned.
+ *
+ * @param onError
+ *      Pointer to a error event callback function. If a NULL pointer is given,
+ *      @ref CH_ERROR_MATCHLIMIT and @ref CH_ERROR_RECURSIONLIMIT errors will
+ *      be ignored and match will continue.
+ *
+ * @param context
+ *      The user defined pointer which will be passed to the callback function.
+ *
+ * @return
+ *      Returns @ref CH_SUCCESS on success; @ref CH_SCAN_TERMINATED if the
+ *      match callback indicated that scanning should stop; other values on
+ *      error.
+ */
+ch_error_t HS_CDECL ch_scan(const ch_database_t *db, const char *data,
+                            unsigned int length, unsigned int flags,
+                            ch_scratch_t *scratch,
+                            ch_match_event_handler onEvent,
+                            ch_error_event_handler onError,
+                            void *context);
+
+/**
+ * Allocate a "scratch" space for use by Chimera.
+ *
+ * This is required for runtime use, and one scratch space per thread, or
+ * concurrent caller, is required. Any allocator callback set by @ref
+ * ch_set_scratch_allocator() or @ref ch_set_allocator() will be used by this
+ * function.
+ *
+ * @param db
+ *      The database, as produced by @ref ch_compile().
+ *
+ * @param scratch
+ *      On first allocation, a pointer to NULL should be provided so a new
+ *      scratch can be allocated. If a scratch block has been previously
+ *      allocated, then a pointer to it should be passed back in to see if it
+ *      is valid for this database block. If a new scratch block is required,
+ *      the original will be freed and the new one returned, otherwise the
+ *      previous scratch block will be returned. On success, the scratch block
+ *      will be suitable for use with the provided database in addition to any
+ *      databases that original scratch space was suitable for.
+ *
+ * @return
+ *      @ref CH_SUCCESS on successful allocation; @ref CH_NOMEM if the
+ *      allocation fails.  Other errors may be returned if invalid parameters
+ *      are specified.
+ */
+ch_error_t HS_CDECL ch_alloc_scratch(const ch_database_t *db,
+                                     ch_scratch_t **scratch);
+
+/**
+ * Allocate a scratch space that is a clone of an existing scratch space.
+ *
+ * This is useful when multiple concurrent threads will be using the same set
+ * of compiled databases, and another scratch space is required. Any allocator
+ * callback set by @ref ch_set_scratch_allocator() or @ref ch_set_allocator()
+ * will be used by this function.
+ *
+ * @param src
+ *      The existing @ref ch_scratch_t to be cloned.
+ *
+ * @param dest
+ *      A pointer to the new scratch space will be returned here.
+ *
+ * @return
+ *      @ref CH_SUCCESS on success; @ref CH_NOMEM if the allocation fails.
+ *      Other errors may be returned if invalid parameters are specified.
+ */
+ch_error_t HS_CDECL ch_clone_scratch(const ch_scratch_t *src,
+                                     ch_scratch_t **dest);
+
+/**
+ * Provides the size of the given scratch space.
+ *
+ * @param scratch
+ *      A per-thread scratch space allocated by @ref ch_alloc_scratch() or @ref
+ *      ch_clone_scratch().
+ *
+ * @param scratch_size
+ *      On success, the size of the scratch space in bytes is placed in this
+ *      parameter.
+ *
+ * @return
+ *      @ref CH_SUCCESS on success, other values on failure.
+ */
+ch_error_t HS_CDECL ch_scratch_size(const ch_scratch_t *scratch,
+                                    size_t *scratch_size);
+
+/**
+ * Free a scratch block previously allocated by @ref ch_alloc_scratch() or @ref
+ * ch_clone_scratch().
+ *
+ * The free callback set by @ref ch_set_scratch_allocator() or @ref
+ * ch_set_allocator() will be used by this function.
+ *
+ * @param scratch
+ *      The scratch block to be freed. NULL may also be safely provided.
+ *
+ * @return
+ *      @ref CH_SUCCESS on success, other values on failure.
+ */
+ch_error_t HS_CDECL ch_free_scratch(ch_scratch_t *scratch);
+
+#ifdef __cplusplus
+} /* extern "C" */
+#endif
+
+#endif /* CH_RUNTIME_H_ */

chimera/ch_scratch.c

@@ -0,0 +1,317 @@
+/*
+ * Copyright (c) 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.
+ */
+
+/** \file
+ * \brief Chimera: scratch space alloc.
+ */
+
+#include <string.h>
+
+#include "allocator.h"
+#include "ch.h"
+#include "hs.h"
+#include "hs_internal.h"
+#include "ue2common.h"
+#include "ch_alloc.h"
+#include "ch_internal.h"
+#include "ch_scratch.h"
+#include "ch_database.h"
+
+static
+size_t getPatternDataSize(const ch_scratch_t *s) {
+    size_t numCapturingStructs =
+        s->patternCount * (s->maxCaptureGroups + 1);
+    return (sizeof(struct ch_patterndata) * s->patternCount) +
+           alignof(struct ch_capture) + // padding
+           (sizeof(struct ch_capture) * numCapturingStructs);
+}
+
+static
+void initPatternData(const ch_scratch_t *s) {
+    // ch_capture array is aligned, directly after the patterndata array.
+    char *ptr = (char *)s->patternData +
+            (sizeof(struct ch_patterndata) * s->patternCount);
+    struct ch_capture *cap = (struct ch_capture *)
+            (ROUNDUP_PTR(ptr, alignof(struct ch_capture)));
+
+    for (u32 i = 0; i < s->patternCount; i++) {
+        struct ch_patterndata *pd = &s->patternData[i];
+        pd->match = cap;
+        DEBUG_PRINTF("pattern %u: pd=%p, match=%p\n", i, pd, pd->match);
+        cap += (s->maxCaptureGroups + 1);
+    }
+}
+
+static
+ch_error_t alloc_scratch(const ch_scratch_t *proto, ch_scratch_t **scratch) {
+    size_t ovectorSize = (proto->maxCaptureGroups + 1) * sizeof(int) * 3;
+    size_t capturedSize =
+        sizeof(struct ch_capture) * (proto->maxCaptureGroups + 1);
+    size_t patternDataSize = getPatternDataSize(proto);
+    size_t activeSize = proto->activeSize;
+    size_t queueSize = proto->patternCount * sizeof(struct queue_item);
+
+    // max padding for alignment below.
+    size_t padding = alignof(int) + alignof(struct ch_capture) +
+                     alignof(struct ch_patterndata) +
+                     alignof(struct queue_item);
+
+    size_t allocSize = sizeof(ch_scratch_t) + ovectorSize + capturedSize +
+                       patternDataSize + activeSize + queueSize + padding
+                       + 256; /* padding for cacheline alignment */
+    ch_scratch_t *s;
+    ch_scratch_t *s_tmp = ch_scratch_alloc(allocSize);
+    ch_error_t err = ch_check_alloc(s_tmp);
+    if (err != CH_SUCCESS) {
+        ch_scratch_free(s_tmp);
+        *scratch = NULL;
+        return err;
+    }
+
+    memset(s_tmp, 0, allocSize);
+    s = ROUNDUP_PTR(s_tmp, 64);
+    // Set ordinary members.
+    *s = *proto;
+
+    s->magic = CH_SCRATCH_MAGIC;
+    s->in_use = 0;
+    s->scratch_alloc = (char *)s_tmp;
+
+    // Set pointers internal to allocation.
+
+    char *ptr = (char *)s + sizeof(*s);
+    ptr = ROUNDUP_PTR(ptr, alignof(int));
+    s->ovector = (int *)ptr;
+    ptr += ovectorSize;
+
+    ptr = ROUNDUP_PTR(ptr, alignof(struct ch_capture));
+    s->captured = (struct ch_capture *)ptr;
+    ptr += capturedSize;
+
+    ptr = ROUNDUP_PTR(ptr, alignof(struct ch_patterndata));
+    s->patternData = (struct ch_patterndata *)ptr;
+    ptr += patternDataSize;
+
+    // Pre-fill pattern data, setting captureOffsets
+    initPatternData(s);
+
+    ptr = ROUNDUP_PTR(ptr, alignof(struct queue_item));
+    s->pq.item = (struct queue_item *)ptr;
+    ptr += queueSize;
+
+    s->active = (u8 *)ptr;
+
+    // Store size.
+    s->scratchSize = allocSize;
+
+    // We should never overrun our allocation.
+    assert((ptr + activeSize) - (char *)s <= (ptrdiff_t)allocSize);
+
+    *scratch = s;
+    return CH_SUCCESS;
+}
+
+HS_PUBLIC_API
+ch_error_t HS_CDECL ch_alloc_scratch(const ch_database_t *hydb,
+                                     ch_scratch_t **scratch) {
+    if (!hydb || !scratch) {
+        DEBUG_PRINTF("invalid args\n");
+        return CH_INVALID;
+    }
+
+    DEBUG_PRINTF("hydb=%p, &scratch=%p\n", hydb, scratch);
+    ch_error_t rv = hydbIsValid(hydb);
+    if (rv != CH_SUCCESS) {
+        DEBUG_PRINTF("invalid database\n");
+        return rv;
+    }
+
+    if (*scratch != NULL) {
+        /* has to be aligned before we can do anything with it */
+        if (!ISALIGNED_CL(*scratch)) {
+            return CH_INVALID;
+        }
+        if ((*scratch)->magic != CH_SCRATCH_MAGIC) {
+            return CH_INVALID;
+        }
+        if (markScratchInUse(*scratch)) {
+            return CH_SCRATCH_IN_USE;
+        }
+    }
+
+    // We allocate a prototype of the scratch header to do our sizing with.
+    ch_scratch_t *proto;
+    ch_scratch_t *proto_tmp = ch_scratch_alloc(sizeof(ch_scratch_t) + 256);
+    ch_error_t proto_ret = ch_check_alloc(proto_tmp);
+    if (proto_ret != CH_SUCCESS) {
+        ch_scratch_free(proto_tmp);
+        ch_scratch_free(*scratch);
+        *scratch = NULL;
+        return proto_ret;
+    }
+
+    proto = ROUNDUP_PTR(proto_tmp, 64);
+
+    int resize = 0;
+    if (*scratch) {
+        *proto = **scratch;
+    } else {
+        memset(proto, 0, sizeof(*proto));
+        resize = 1;
+    }
+    proto->scratch_alloc = (char *)proto_tmp;
+
+    const struct ch_bytecode *db = ch_get_bytecode(hydb);
+
+    if (db->maxCaptureGroups > proto->maxCaptureGroups) {
+        proto->maxCaptureGroups = db->maxCaptureGroups;
+        resize = 1;
+    }
+
+    if (db->patternCount > proto->patternCount) {
+        proto->patternCount = db->patternCount;
+        proto->activeSize = db->activeSize;
+        resize = 1;
+    }
+
+    if (resize) {
+        if (*scratch) {
+            ch_scratch_free((*scratch)->scratch_alloc);
+        }
+
+        ch_error_t alloc_ret = alloc_scratch(proto, scratch);
+        ch_scratch_free(proto_tmp);
+        if (alloc_ret != CH_SUCCESS) {
+            *scratch = NULL;
+            return alloc_ret;
+        }
+    } else {
+        ch_scratch_free(proto_tmp);
+        unmarkScratchInUse(*scratch);
+    }
+
+    if (db->flags & CHIMERA_FLAG_NO_MULTIMATCH) {
+        (*scratch)->multi_scratch = NULL;
+        return CH_SUCCESS;
+    }
+
+    // We may still have to realloc the underlying Hyperscan scratch.
+    rv = hs_alloc_scratch(getHyperscanDatabase(db),
+                           &(*scratch)->multi_scratch);
+    if (rv != HS_SUCCESS) {
+        DEBUG_PRINTF("hs_alloc_scratch for multi_scratch failed\n");
+        hs_free_scratch((*scratch)->multi_scratch);
+        ch_scratch_free((*scratch)->scratch_alloc);
+        *scratch = NULL;
+        return rv;
+    }
+
+    return CH_SUCCESS;
+}
+
+HS_PUBLIC_API
+ch_error_t HS_CDECL ch_clone_scratch(const ch_scratch_t *src,
+                                     ch_scratch_t **dest) {
+    if (!dest || !src || !ISALIGNED_CL(src) ||
+        src->magic != CH_SCRATCH_MAGIC) {
+        DEBUG_PRINTF("scratch invalid\n");
+        return CH_INVALID;
+    }
+
+    ch_error_t ret = alloc_scratch(src, dest);
+    if (ret != CH_SUCCESS) {
+        DEBUG_PRINTF("alloc_scratch failed\n");
+        *dest = NULL;
+        return ret;
+    }
+
+    if (src->multi_scratch) {
+        (*dest)->multi_scratch = NULL;
+        ret = hs_clone_scratch(src->multi_scratch, &(*dest)->multi_scratch);
+        if (ret != HS_SUCCESS) {
+            DEBUG_PRINTF("hs_clone_scratch(multi_scratch,...) failed\n");
+            ch_scratch_free(*dest);
+            return ret;
+        }
+    }
+
+    return CH_SUCCESS;
+}
+
+HS_PUBLIC_API
+ch_error_t HS_CDECL ch_free_scratch(ch_scratch_t *scratch) {
+    ch_error_t ret = CH_SUCCESS;
+    if (scratch) {
+        /* has to be aligned before we can do anything with it */
+        if (!ISALIGNED_CL(scratch)) {
+            return CH_INVALID;
+        }
+        if (scratch->magic != CH_SCRATCH_MAGIC) {
+            return CH_INVALID;
+        }
+        if (markScratchInUse(scratch)) {
+            return CH_SCRATCH_IN_USE;
+        }
+
+        if (scratch->multi_scratch) {
+            ret = hs_free_scratch(scratch->multi_scratch);
+        }
+
+        scratch->magic = 0;
+        assert(scratch->scratch_alloc);
+        DEBUG_PRINTF("scratch %p is really at %p : freeing\n", scratch,
+                     scratch->scratch_alloc);
+        ch_scratch_free(scratch->scratch_alloc);
+    }
+
+    return ret;
+}
+
+/** Not public, but used for info from our internal tools. Note that in the
+ * hybrid matcher the scratch is definitely not a contiguous memory region. */
+HS_PUBLIC_API
+ch_error_t HS_CDECL ch_scratch_size(const ch_scratch_t *scratch, size_t *size) {
+    ch_error_t ret = CH_SUCCESS;
+    if (!size || !scratch || !ISALIGNED_CL(scratch) ||
+        scratch->magic != CH_SCRATCH_MAGIC) {
+        return CH_INVALID;
+    } else {
+        size_t multi_size = 0;
+
+        if (scratch->multi_scratch) {
+            ret = hs_scratch_size(scratch->multi_scratch, &multi_size);
+        }
+        if (ret) {
+            multi_size = 0;
+        }
+
+        *size = scratch->scratchSize + multi_size;
+    }
+
+    return ret;
+}

chimera/ch_scratch.h

@@ -0,0 +1,119 @@
+/*
+ * Copyright (c) 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.
+ */
+
+/** \file
+ * \brief Scratch and associated data structures.
+ *
+ * This header gets pulled into many places (many deep, slow to compile
+ * places). Try to keep the included headers under control.
+ */
+
+#ifndef CH_SCRATCH_H_
+#define CH_SCRATCH_H_
+
+#include "ch_common.h"
+#include "ch_runtime.h"
+
+#ifdef __cplusplus
+extern "C"
+{
+#endif
+
+#define CH_SCRATCH_MAGIC 0x554F4259 //!< Magic number stored in \ref ch_scratch
+
+struct queue_item {
+    int from; /** \brief used to store the start location. */
+    int to; /** \brief used to store the current location. */
+    u32 id; /**< pattern index. */
+};
+
+struct match_pq {
+    struct queue_item *item;
+    u32 size; /**< current size of the priority queue */
+};
+
+/** \brief Information about a pattern stored at runtime when a match is
+ * encountered. */
+struct ch_patterndata {
+    struct ch_capture *match; //!< buffered group info
+    u32 groupCount; //!< number of capturing groups
+    u32 scanStart; //!< start of match window (still to be single-scanned).
+};
+
+/** \brief Scratch space header for Chimera. */
+struct ch_scratch {
+    u32 magic; //!< must be \ref CH_SCRATCH_MAGIC
+    u8 in_use; /**< non-zero when being used by an API call. */
+    struct hs_scratch *multi_scratch; //!< for hyperscan scatch.
+    int *ovector; //!< maximally-sized ovector for PCRE usage.
+    struct ch_capture *captured; //!< max-sized capture group struct.
+    u8 *active; //!< active multibit.
+    struct ch_patterndata *patternData; //!< per-pattern match data, indexed by
+                                        // pattern ID.
+    struct match_pq pq; //!< priority queue to ensure matching ordering
+    u32 patternCount; //!< number of patterns, used to size active multibit
+    u32 activeSize;   //!< size of active multibit
+    u32 maxCaptureGroups; //!< largest num of capturing groups required
+    u32 scratchSize; //!< size of allocation
+    int ret;  //!< return value in Hyperscan callback
+    char *scratch_alloc; /* user allocated scratch object */
+};
+
+/**
+ * \brief Mark scratch as in use.
+ *
+ * Returns non-zero if it was already in use, zero otherwise.
+ */
+static really_inline
+char markScratchInUse(struct ch_scratch *scratch) {
+    DEBUG_PRINTF("marking scratch as in use\n");
+    assert(scratch && scratch->magic == CH_SCRATCH_MAGIC);
+    if (scratch->in_use) {
+        DEBUG_PRINTF("scratch already in use!\n");
+        return 1;
+    }
+    scratch->in_use = 1;
+    return 0;
+}
+
+/**
+ * \brief Mark scratch as no longer in use.
+ */
+static really_inline
+void unmarkScratchInUse(struct ch_scratch *scratch) {
+    DEBUG_PRINTF("marking scratch as not in use\n");
+    assert(scratch && scratch->magic == CH_SCRATCH_MAGIC);
+    assert(scratch->in_use == 1);
+    scratch->in_use = 0;
+}
+
+#ifdef __cplusplus
+} /* extern "C" */
+#endif
+
+#endif /* CH_SCRATCH_H_ */

cmake/pcre.cmake

@@ -61,5 +61,3 @@ else ()
         return ()
     endif ()
 endif (PCRE_BUILD_SOURCE)
-
-set (PCRE_CHECKED TRUE PARENT_SCOPE)

src/util/multibit_build.cpp

@@ -46,7 +46,7 @@ using namespace std;
 
 namespace ue2 {
 
-u32 mmbit_size(u32 total_bits) {
+u32 HS_CDECL mmbit_size(u32 total_bits) {
     if (total_bits > MMB_MAX_BITS) {
         throw ResourceLimitError();
     }

src/util/multibit_build.h

@@ -33,6 +33,7 @@
 #ifndef MULTIBIT_BUILD_H
 #define MULTIBIT_BUILD_H
 
+#include "hs_common.h"
 #include "multibit_internal.h"
 #include "hash.h"
 
@@ -62,8 +63,10 @@ namespace ue2 {
  *
  * This will throw a resource limit assertion if the requested mmbit is too
  * large.
+ *
+ * TODO:add temporary HS_CDECL for chimera on Windows, need improve this.
  */
-u32 mmbit_size(u32 total_bits);
+u32 HS_CDECL mmbit_size(u32 total_bits);
 
 /** \brief Construct a sparse iterator over the values in \a bits for a
  * multibit of size \a total_bits. */

tools/hsbench/CMakeLists.txt

@@ -31,6 +31,8 @@ SET(hsbench_SOURCES
     common.h
     data_corpus.cpp
     data_corpus.h
+    engine.cpp
+    engine.h
     engine_hyperscan.cpp
     engine_hyperscan.h
     heapstats.cpp
@@ -45,6 +47,23 @@ SET(hsbench_SOURCES
     timer.h
 )
 
+if (BUILD_CHIMERA)
+    add_definitions(-DHS_HYBRID)
+    SET(hsbench_SOURCES
+        ${hsbench_SOURCES}
+        engine_chimera.cpp
+        engine_chimera.h
+        engine_pcre.cpp
+        engine_pcre.h
+    )
+endif()
+
 add_executable(hsbench ${hsbench_SOURCES})
-target_link_libraries(hsbench hs databaseutil expressionutil ${SQLITE3_LDFLAGS}
-    ${CMAKE_THREAD_LIBS_INIT})
+if (BUILD_CHIMERA)
+    include_directories(${PCRE_INCLUDE_DIRS})
+    target_link_libraries(hsbench hs chimera ${PCRE_LDFLAGS} databaseutil
+        expressionutil ${SQLITE3_LDFLAGS} ${CMAKE_THREAD_LIBS_INIT})
+else()
+    target_link_libraries(hsbench hs databaseutil expressionutil
+        ${SQLITE3_LDFLAGS} ${CMAKE_THREAD_LIBS_INIT})
+endif()

tools/hsbench/common.h

@@ -1,5 +1,5 @@
 /*
- * Copyright (c) 2016-2017, Intel Corporation
+ * Copyright (c) 2016-2018, Intel Corporation
  *
  * Redistribution and use in source and binary forms, with or without
  * modification, are permitted provided that the following conditions are met:
@@ -42,6 +42,12 @@ extern bool forceEditDistance;
 extern unsigned editDistance;
 extern bool printCompressSize;
 
+/** Structure for the result of a single complete scan. */
+struct ResultEntry {
+    double seconds = 0;       //!< Time taken for scan.
+    unsigned int matches = 0; //!< Count of matches found.
+};
+
 struct SqlFailure {
     explicit SqlFailure(const std::string &s) : message(s) {}
     std::string message;

tools/hsbench/engine.cpp

@@ -0,0 +1,35 @@
+/*
+ * Copyright (c) 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 "engine.h"
+
+EngineContext::~EngineContext() { }
+
+EngineStream::~EngineStream() { }
+
+Engine::~Engine() { }

tools/hsbench/engine.h

@@ -0,0 +1,94 @@
+/*
+ * Copyright (c) 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.
+ */
+
+#ifndef ENGINE_H
+#define ENGINE_H
+
+#include "common.h"
+#include "sqldb.h"
+
+#include <memory>
+#include <string>
+#include <vector>
+
+#include <boost/core/noncopyable.hpp>
+
+// Engines have an engine context which is allocated on a per-thread basis.
+class EngineContext : boost::noncopyable {
+public:
+    virtual ~EngineContext();
+};
+
+/** Streaming mode scans have persistent stream state associated with them. */
+class EngineStream : boost::noncopyable {
+public:
+    virtual ~EngineStream();
+    unsigned int sn;
+};
+
+// Benchmarking engine
+class Engine : boost::noncopyable {
+public:
+    virtual ~Engine();
+
+    // allocate an EngineContext
+    virtual std::unique_ptr<EngineContext> makeContext() const = 0;
+
+    // non-streaming scan
+    virtual void scan(const char *data, unsigned len, unsigned blockId,
+                      ResultEntry &results, EngineContext &ectx) const = 0;
+
+    // vectoring scan
+    virtual void scan_vectored(const char *const *data,
+                               const unsigned int *len, unsigned int count,
+                               unsigned int streamId, ResultEntry &result,
+                               EngineContext &ectx) const = 0;
+
+    // stream open
+    virtual std::unique_ptr<EngineStream> streamOpen(EngineContext &ectx,
+                                                     unsigned id) const = 0;
+
+    // stream close
+    virtual void streamClose(std::unique_ptr<EngineStream> stream,
+                             ResultEntry &result) const = 0;
+
+    // stream compress and expand
+    virtual void streamCompressExpand(EngineStream &stream,
+                                      std::vector<char> &temp) const = 0;
+
+    // streaming scan
+    virtual void streamScan(EngineStream &stream, const char *data,
+                            unsigned int len, unsigned int id,
+                            ResultEntry &result) const = 0;
+
+    virtual void printStats() const = 0;
+
+    virtual void sqlStats(SqlDB &db) const = 0;
+};
+
+#endif // ENGINE_H

tools/hsbench/engine_chimera.cpp

@@ -0,0 +1,314 @@
+/*
+ * Copyright (c) 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 "config.h"
+
+#include "ExpressionParser.h"
+#include "common.h"
+#include "engine_chimera.h"
+#include "expressions.h"
+#include "heapstats.h"
+#include "sqldb.h"
+#include "timer.h"
+
+#include "chimera/ch_database.h"
+
+#include "util/make_unique.h"
+
+using namespace std;
+
+EngineCHContext::EngineCHContext(const ch_database_t *db) {
+    ch_alloc_scratch(db, &scratch);
+    assert(scratch);
+}
+
+EngineCHContext::~EngineCHContext() {
+    ch_free_scratch(scratch);
+}
+
+namespace /* anonymous */ {
+
+/** Scan context structure passed to the onMatch callback function. */
+struct ScanCHContext {
+    ScanCHContext(unsigned id_in, ResultEntry &result_in)
+        : id(id_in), result(result_in) {}
+    unsigned id;
+    ResultEntry &result;
+};
+
+} // namespace
+
+/**
+ * Callback function called for every match that Chimera produces, used when
+ * "echo matches" is off.
+ */
+static
+int onMatch(unsigned int, unsigned long long, unsigned long long, unsigned int,
+            unsigned int, const ch_capture_t *, void *ctx) {
+    ScanCHContext *sc = static_cast<ScanCHContext *>(ctx);
+    assert(sc);
+    sc->result.matches++;
+
+    return 0;
+}
+
+/**
+ * Callback function called for every match that Chimera produces when "echo
+ * matches" is enabled.
+ */
+static
+int onMatchEcho(unsigned int id, unsigned long long, unsigned long long to,
+                unsigned int, unsigned int, const ch_capture_t *, void *ctx) {
+    ScanCHContext *sc = static_cast<ScanCHContext *>(ctx);
+    assert(sc);
+    sc->result.matches++;
+
+    printf("Match @%u:%llu for %u\n", sc->id, to, id);
+
+    return 0;
+}
+
+EngineChimera::EngineChimera(ch_database_t *db_in, CompileCHStats cs)
+    : db(db_in), compile_stats(move(cs)) {
+    assert(db);
+}
+
+EngineChimera::~EngineChimera() {
+    ch_free_database(db);
+}
+
+unique_ptr<EngineContext> EngineChimera::makeContext() const {
+    return ue2::make_unique<EngineCHContext>(db);
+}
+
+void EngineChimera::scan(const char *data, unsigned int len, unsigned int id,
+                         ResultEntry &result, EngineContext &ectx) const {
+    assert(data);
+
+    auto &ctx = static_cast<EngineCHContext &>(ectx);
+    ScanCHContext sc(id, result);
+    auto callback = echo_matches ? onMatchEcho : onMatch;
+    ch_error_t rv = ch_scan(db, data, len, 0, ctx.scratch, callback, nullptr,
+                            &sc);
+
+    if (rv != CH_SUCCESS) {
+        printf("Fatal error: ch_scan returned error %d\n", rv);
+        abort();
+    }
+}
+
+// vectoring scan
+void EngineChimera::scan_vectored(UNUSED const char *const *data,
+                                  UNUSED const unsigned int *len,
+                                  UNUSED unsigned int count,
+                                  UNUSED unsigned int streamId,
+                                  UNUSED ResultEntry &result,
+                                  UNUSED EngineContext &ectx) const {
+    printf("Hybrid matcher can't support vectored mode.\n");
+    abort();
+}
+
+unique_ptr<EngineStream> EngineChimera::streamOpen(UNUSED EngineContext &ectx,
+                                                   UNUSED unsigned id) const {
+    printf("Hybrid matcher can't stream.\n");
+    abort();
+}
+
+void EngineChimera::streamClose(UNUSED unique_ptr<EngineStream> stream,
+                                UNUSED ResultEntry &result) const {
+    printf("Hybrid matcher can't stream.\n");
+    abort();
+}
+
+void EngineChimera::streamScan(UNUSED EngineStream &stream,
+                               UNUSED const char *data,
+                               UNUSED unsigned len, UNUSED unsigned id,
+                               UNUSED ResultEntry &result) const {
+    printf("Hybrid matcher can't stream.\n");
+    abort();
+}
+
+void EngineChimera::streamCompressExpand(UNUSED EngineStream &stream,
+                                         UNUSED vector<char> &temp) const {
+    printf("Hybrid matcher can't stream.\n");
+    abort();
+}
+
+void EngineChimera::printStats() const {
+    // Output summary information.
+    if (!compile_stats.sigs_name.empty()) {
+        printf("Signature set:        %s\n", compile_stats.sigs_name.c_str());
+    }
+    printf("Signatures:        %s\n", compile_stats.signatures.c_str());
+    printf("Chimera info:      %s\n", compile_stats.db_info.c_str());
+    printf("Expression count:  %'zu\n", compile_stats.expressionCount);
+    printf("Bytecode size:     %'zu bytes\n", compile_stats.compiledSize);
+    printf("Database CRC:      0x%x\n", compile_stats.crc32);
+    printf("Scratch size:      %'zu bytes\n", compile_stats.scratchSize);
+    printf("Compile time:      %'0.3Lf seconds\n", compile_stats.compileSecs);
+    printf("Peak heap usage:   %'u bytes\n", compile_stats.peakMemorySize);
+}
+
+void EngineChimera::sqlStats(SqlDB &sqldb) const {
+    ostringstream crc;
+    crc << "0x" << hex << compile_stats.crc32;
+
+    static const string Q =
+        "INSERT INTO Compile ("
+            "sigsName, signatures, dbInfo, exprCount, dbSize, crc,"
+            "scratchSize, compileSecs, peakMemory) "
+        "VALUES (?1, ?2, ?3, ?4, ?5, ?6, ?7, ?8, ?9)";
+
+    sqldb.insert_all(Q, compile_stats.sigs_name, compile_stats.signatures,
+                     compile_stats.db_info, compile_stats.expressionCount,
+                     compile_stats.compiledSize, crc.str(),
+                     compile_stats.scratchSize, compile_stats.compileSecs,
+                     compile_stats.peakMemorySize);
+}
+
+unique_ptr<EngineChimera>
+buildEngineChimera(const ExpressionMap &expressions, const string &name,
+                   const string &sigs_name) {
+    if (expressions.empty()) {
+        assert(0);
+        return nullptr;
+    }
+
+    long double compileSecs = 0.0;
+    size_t compiledSize = 0.0;
+    size_t scratchSize = 0;
+    unsigned int peakMemorySize = 0;
+    string db_info;
+
+    ch_database_t *db;
+    ch_error_t err;
+
+    const unsigned int count = expressions.size();
+
+    vector<string> exprs;
+    vector<unsigned int> flags, ids;
+    vector<hs_expr_ext> ext;
+
+    for (const auto &m : expressions) {
+        string expr;
+        unsigned int f = 0;
+        hs_expr_ext extparam; // unused
+        extparam.flags = 0;
+        if (!readExpression(m.second, expr, &f, &extparam)) {
+            printf("Error parsing PCRE: %s (id %u)\n", m.second.c_str(),
+                   m.first);
+            return nullptr;
+        }
+
+        if (extparam.flags) {
+            printf("Error parsing PCRE with extended flags: %s (id %u)\n",
+                   m.second.c_str(), m.first);
+            return nullptr;
+        }
+        exprs.push_back(expr);
+        ids.push_back(m.first);
+        flags.push_back(f);
+    }
+
+    // Our compiler takes an array of plain ol' C strings.
+    vector<const char *> patterns(count);
+    for (unsigned int i = 0; i < count; i++) {
+        patterns[i] = exprs[i].c_str();
+    }
+
+    Timer timer;
+    timer.start();
+
+    // Capture groups by default
+    unsigned int mode = CH_MODE_GROUPS;
+    ch_compile_error_t *compile_err;
+    err = ch_compile_multi(patterns.data(), flags.data(), ids.data(),
+                           count, mode, nullptr, &db, &compile_err);
+
+    timer.complete();
+    compileSecs = timer.seconds();
+    peakMemorySize = getPeakHeap();
+
+    if (err == CH_COMPILER_ERROR) {
+        if (compile_err->expression >= 0) {
+            printf("Compile error for signature #%u: %s\n",
+                   compile_err->expression, compile_err->message);
+        } else {
+            printf("Compile error: %s\n", compile_err->message);
+        }
+        ch_free_compile_error(compile_err);
+        return nullptr;
+    }
+
+    err = ch_database_size(db, &compiledSize);
+    if (err != CH_SUCCESS) {
+        return nullptr;
+    }
+    assert(compiledSize > 0);
+
+    char *info;
+    err = ch_database_info(db, &info);
+    if (err != CH_SUCCESS) {
+        return nullptr;
+    } else {
+        db_info = string(info);
+        free(info);
+    }
+
+    // Allocate scratch temporarily to find its size: this is a good test
+    // anyway.
+    ch_scratch_t *scratch = nullptr;
+    err = ch_alloc_scratch(db, &scratch);
+    if (err != HS_SUCCESS) {
+        return nullptr;
+    }
+
+    err = ch_scratch_size(scratch, &scratchSize);
+    if (err != CH_SUCCESS) {
+        return nullptr;
+    }
+    ch_free_scratch(scratch);
+
+    // Collect summary information.
+    CompileCHStats cs;
+    cs.sigs_name = sigs_name;
+    if (!sigs_name.empty()) {
+        const auto pos = name.find_last_of('/');
+        cs.signatures = name.substr(pos + 1);
+    } else {
+        cs.signatures = name;
+    }
+    cs.db_info = db_info;
+    cs.expressionCount = expressions.size();
+    cs.compiledSize = compiledSize;
+    cs.scratchSize = scratchSize;
+    cs.compileSecs = compileSecs;
+    cs.peakMemorySize = peakMemorySize;
+
+    return ue2::make_unique<EngineChimera>(db, move(cs));
+}

tools/hsbench/engine_chimera.h

@@ -0,0 +1,103 @@
+/*
+ * Copyright (c) 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.
+ */
+
+#ifndef ENGINECHIMERA_H
+#define ENGINECHIMERA_H
+
+#include "expressions.h"
+#include "engine.h"
+
+#include "chimera/ch.h"
+
+#include <memory>
+#include <string>
+#include <vector>
+
+/** Infomation about the database compile */
+struct CompileCHStats {
+    std::string sigs_name;
+    std::string signatures;
+    std::string db_info;
+    size_t expressionCount = 0;
+    size_t compiledSize = 0;
+    uint32_t crc32 = 0;
+    size_t scratchSize = 0;
+    long double compileSecs = 0;
+    unsigned int peakMemorySize = 0;
+};
+
+/** Engine context which is allocated on a per-thread basis. */
+class EngineCHContext : public EngineContext{
+public:
+    explicit EngineCHContext(const ch_database_t *db);
+    ~EngineCHContext();
+
+    ch_scratch_t *scratch = nullptr;
+};
+
+/** Chimera Engine for scanning data. */
+class EngineChimera : public Engine {
+public:
+    explicit EngineChimera(ch_database_t *db, CompileCHStats cs);
+    ~EngineChimera();
+
+    std::unique_ptr<EngineContext> makeContext() const;
+
+    void scan(const char *data, unsigned int len, unsigned int id,
+              ResultEntry &result, EngineContext &ectx) const;
+
+    void scan_vectored(const char *const *data, const unsigned int *len,
+                       unsigned int count, unsigned int streamId,
+                       ResultEntry &result, EngineContext &ectx) const;
+
+    std::unique_ptr<EngineStream> streamOpen(EngineContext &ectx,
+                                             unsigned id) const;
+
+    void streamClose(std::unique_ptr<EngineStream> stream,
+                     ResultEntry &result) const;
+
+    void streamCompressExpand(EngineStream &stream,
+                              std::vector<char> &temp) const;
+
+    void streamScan(EngineStream &stream, const char *data, unsigned int len,
+                    unsigned int id, ResultEntry &result) const;
+
+    void printStats() const;
+
+    void sqlStats(SqlDB &db) const;
+
+private:
+    ch_database_t *db;
+    CompileCHStats compile_stats;
+};
+
+std::unique_ptr<EngineChimera>
+buildEngineChimera(const ExpressionMap &expressions, const std::string &name,
+                   const std::string &sigs_name);
+
+#endif // ENGINECHIMERA_H

tools/hsbench/engine_hyperscan.cpp

@@ -1,5 +1,5 @@
 /*
- * Copyright (c) 2016-2017, Intel Corporation
+ * Copyright (c) 2016-2018, Intel Corporation
  *
  * Redistribution and use in source and binary forms, with or without
  * modification, are permitted provided that the following conditions are met:
@@ -57,20 +57,22 @@
 
 using namespace std;
 
-EngineContext::EngineContext(const hs_database_t *db) {
+EngineHSContext::EngineHSContext(const hs_database_t *db) {
     hs_alloc_scratch(db, &scratch);
     assert(scratch);
 }
 
-EngineContext::~EngineContext() {
+EngineHSContext::~EngineHSContext() {
     hs_free_scratch(scratch);
 }
 
+EngineHSStream::~EngineHSStream() { }
+
 namespace /* anonymous */ {
 
 /** Scan context structure passed to the onMatch callback function. */
-struct ScanContext {
-    ScanContext(unsigned id_in, ResultEntry &result_in,
+struct ScanHSContext {
+    ScanHSContext(unsigned id_in, ResultEntry &result_in,
                 const EngineStream *stream_in)
         : id(id_in), result(result_in), stream(stream_in) {}
     unsigned id;
@@ -87,7 +89,7 @@ struct ScanContext {
 static
 int onMatch(unsigned int, unsigned long long, unsigned long long, unsigned int,
             void *ctx) {
-    ScanContext *sc = static_cast<ScanContext *>(ctx);
+    ScanHSContext *sc = static_cast<ScanHSContext *>(ctx);
     assert(sc);
     sc->result.matches++;
 
@@ -101,7 +103,7 @@ int onMatch(unsigned int, unsigned long long, unsigned long long, unsigned int,
 static
 int onMatchEcho(unsigned int id, unsigned long long, unsigned long long to,
                 unsigned int, void *ctx) {
-    ScanContext *sc = static_cast<ScanContext *>(ctx);
+    ScanHSContext *sc = static_cast<ScanHSContext *>(ctx);
     assert(sc);
     sc->result.matches++;
 
@@ -114,7 +116,7 @@ int onMatchEcho(unsigned int id, unsigned long long, unsigned long long to,
     return 0;
 }
 
-EngineHyperscan::EngineHyperscan(hs_database_t *db_in, CompileStats cs)
+EngineHyperscan::EngineHyperscan(hs_database_t *db_in, CompileHSStats cs)
     : db(db_in), compile_stats(std::move(cs)) {
     assert(db);
 }
@@ -124,14 +126,15 @@ EngineHyperscan::~EngineHyperscan() {
 }
 
 unique_ptr<EngineContext> EngineHyperscan::makeContext() const {
-    return ue2::make_unique<EngineContext>(db);
+    return ue2::make_unique<EngineHSContext>(db);
 }
 
 void EngineHyperscan::scan(const char *data, unsigned int len, unsigned int id,
-                           ResultEntry &result, EngineContext &ctx) const {
+                           ResultEntry &result, EngineContext &ectx) const {
     assert(data);
 
-    ScanContext sc(id, result, nullptr);
+    EngineHSContext &ctx = static_cast<EngineHSContext &>(ectx);
+    ScanHSContext sc(id, result, nullptr);
     auto callback = echo_matches ? onMatchEcho : onMatch;
     hs_error_t rv = hs_scan(db, data, len, 0, ctx.scratch, callback, &sc);
 
@@ -144,11 +147,12 @@ void EngineHyperscan::scan(const char *data, unsigned int len, unsigned int id,
 void EngineHyperscan::scan_vectored(const char *const *data,
                                     const unsigned int *len, unsigned int count,
                                     unsigned streamId, ResultEntry &result,
-                                    EngineContext &ctx) const {
+                                    EngineContext &ectx) const {
     assert(data);
     assert(len);
 
-    ScanContext sc(streamId, result, nullptr);
+    EngineHSContext &ctx = static_cast<EngineHSContext &>(ectx);
+    ScanHSContext sc(streamId, result, nullptr);
     auto callback = echo_matches ? onMatchEcho : onMatch;
     hs_error_t rv =
         hs_scan_vector(db, data, len, count, 0, ctx.scratch, callback, &sc);
@@ -159,9 +163,10 @@ void EngineHyperscan::scan_vectored(const char *const *data,
     }
 }
 
-unique_ptr<EngineStream> EngineHyperscan::streamOpen(EngineContext &ctx,
+unique_ptr<EngineStream> EngineHyperscan::streamOpen(EngineContext &ectx,
                                                      unsigned streamId) const {
-    auto stream = ue2::make_unique<EngineStream>();
+    EngineHSContext &ctx = static_cast<EngineHSContext &>(ectx);
+    auto stream = ue2::make_unique<EngineHSStream>();
     stream->ctx = &ctx;
 
     hs_open_stream(db, 0, &stream->id);
@@ -170,17 +175,18 @@ unique_ptr<EngineStream> EngineHyperscan::streamOpen(EngineContext &ctx,
         return nullptr;
     }
     stream->sn = streamId;
-    return stream;
+    return move(stream);
 }
 
 void EngineHyperscan::streamClose(unique_ptr<EngineStream> stream,
                                   ResultEntry &result) const {
     assert(stream);
 
-    auto &s = static_cast<EngineStream &>(*stream);
-    EngineContext &ctx = *s.ctx;
+    auto &s = static_cast<EngineHSStream &>(*stream);
+    EngineContext &ectx = *s.ctx;
+    EngineHSContext &ctx = static_cast<EngineHSContext &>(ectx);
 
-    ScanContext sc(0, result, &s);
+    ScanHSContext sc(0, result, &s);
     auto callback = echo_matches ? onMatchEcho : onMatch;
 
     assert(s.id);
@@ -193,10 +199,10 @@ void EngineHyperscan::streamScan(EngineStream &stream, const char *data,
                                  ResultEntry &result) const {
     assert(data);
 
-    auto &s = static_cast<EngineStream &>(stream);
-    EngineContext &ctx = *s.ctx;
+    auto &s = static_cast<EngineHSStream &>(stream);
+    EngineHSContext &ctx = *s.ctx;
 
-    ScanContext sc(id, result, &s);
+    ScanHSContext sc(id, result, &s);
     auto callback = echo_matches ? onMatchEcho : onMatch;
     hs_error_t rv =
         hs_scan_stream(s.id, data, len, 0, ctx.scratch, callback, &sc);
@@ -210,11 +216,12 @@ void EngineHyperscan::streamScan(EngineStream &stream, const char *data,
 void EngineHyperscan::streamCompressExpand(EngineStream &stream,
                                            vector<char> &temp) const {
     size_t used = 0;
-    hs_error_t err = hs_compress_stream(stream.id, temp.data(), temp.size(),
+    auto &s = static_cast<EngineHSStream &>(stream);
+    hs_error_t err = hs_compress_stream(s.id, temp.data(), temp.size(),
                                         &used);
     if (err == HS_INSUFFICIENT_SPACE) {
         temp.resize(used);
-        err = hs_compress_stream(stream.id, temp.data(), temp.size(), &used);
+        err = hs_compress_stream(s.id, temp.data(), temp.size(), &used);
     }
 
     if (err != HS_SUCCESS) {
@@ -223,10 +230,10 @@ void EngineHyperscan::streamCompressExpand(EngineStream &stream,
     }
 
     if (printCompressSize) {
-        printf("stream %u: compressed to %zu\n", stream.sn, used);
+        printf("stream %u: compressed to %zu\n", s.sn, used);
     }
 
-    err = hs_reset_and_expand_stream(stream.id, temp.data(), temp.size(),
+    err = hs_reset_and_expand_stream(s.id, temp.data(), temp.size(),
                                      nullptr, nullptr, nullptr);
 
     if (err != HS_SUCCESS) {
@@ -469,7 +476,7 @@ buildEngineHyperscan(const ExpressionMap &expressions, ScanMode scan_mode,
     hs_free_scratch(scratch);
 
     // Collect summary information.
-    CompileStats cs;
+    CompileHSStats cs;
     cs.sigs_name = sigs_name;
     if (!sigs_name.empty()) {
         const auto pos = name.find_last_of('/');

tools/hsbench/engine_hyperscan.h

@@ -1,5 +1,5 @@
 /*
- * Copyright (c) 2016-2017, Intel Corporation
+ * Copyright (c) 2016-2018, Intel Corporation
  *
  * Redistribution and use in source and binary forms, with or without
  * modification, are permitted provided that the following conditions are met:
@@ -30,22 +30,15 @@
 #define ENGINEHYPERSCAN_H
 
 #include "expressions.h"
-#include "common.h"
-#include "sqldb.h"
+#include "engine.h"
 #include "hs_runtime.h"
 
 #include <memory>
 #include <string>
 #include <vector>
 
-/** Structure for the result of a single complete scan. */
-struct ResultEntry {
-    double seconds = 0;       //!< Time taken for scan.
-    unsigned int matches = 0; //!< Count of matches found.
-};
-
 /** Infomation about the database compile */
-struct CompileStats {
+struct CompileHSStats {
     std::string sigs_name;
     std::string signatures;
     std::string db_info;
@@ -60,38 +53,38 @@ struct CompileStats {
 };
 
 /** Engine context which is allocated on a per-thread basis. */
-class EngineContext {
+class EngineHSContext : public EngineContext {
 public:
-    explicit EngineContext(const hs_database_t *db);
-    ~EngineContext();
+    explicit EngineHSContext(const hs_database_t *db);
+    ~EngineHSContext();
 
     hs_scratch_t *scratch = nullptr;
 };
 
 /** Streaming mode scans have persistent stream state associated with them. */
-class EngineStream {
+class EngineHSStream : public EngineStream {
 public:
+    ~EngineHSStream();
     hs_stream_t *id;
-    unsigned int sn;
-    EngineContext *ctx;
+    EngineHSContext *ctx;
 };
 
 /** Hyperscan Engine for scanning data. */
-class EngineHyperscan {
+class EngineHyperscan : public Engine {
 public:
-    explicit EngineHyperscan(hs_database_t *db, CompileStats cs);
+    explicit EngineHyperscan(hs_database_t *db, CompileHSStats cs);
     ~EngineHyperscan();
 
     std::unique_ptr<EngineContext> makeContext() const;
 
     void scan(const char *data, unsigned int len, unsigned int id,
-              ResultEntry &result, EngineContext &ctx) const;
+              ResultEntry &result, EngineContext &ectx) const;
 
     void scan_vectored(const char *const *data, const unsigned int *len,
                        unsigned int count, unsigned int streamId,
-                       ResultEntry &result, EngineContext &ctx) const;
+                       ResultEntry &result, EngineContext &ectx) const;
 
-    std::unique_ptr<EngineStream> streamOpen(EngineContext &ctx,
+    std::unique_ptr<EngineStream> streamOpen(EngineContext &ectx,
                                              unsigned id) const;
 
     void streamClose(std::unique_ptr<EngineStream> stream,
@@ -109,7 +102,7 @@ public:
 
 private:
     hs_database_t *db;
-    CompileStats compile_stats;
+    CompileHSStats compile_stats;
 };
 
 namespace ue2 {

tools/hsbench/engine_pcre.cpp

@@ -0,0 +1,388 @@
+/*
+ * Copyright (c) 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 "config.h"
+
+#include "common.h"
+#include "engine_pcre.h"
+#include "heapstats.h"
+#include "huge.h"
+#include "sqldb.h"
+#include "timer.h"
+
+#include "util/make_unique.h"
+#include "util/unicode_def.h"
+
+using namespace std;
+
+EnginePCREContext::EnginePCREContext(int capture_cnt) {
+    ovec = (int *)malloc((capture_cnt + 1)* sizeof(int) * 3);
+}
+
+EnginePCREContext::~EnginePCREContext() {
+    free(ovec);
+}
+
+namespace /* anonymous */ {
+
+/** Scan context structure passed to the onMatch callback function. */
+struct ScanPCREContext {
+    ScanPCREContext(unsigned id_in, ResultEntry &result_in)
+        : id(id_in), result(result_in) {}
+    unsigned id;
+    ResultEntry &result;
+};
+
+} // namespace
+
+/**
+ * Function called for every match that PCRE produces, used when
+ * "echo matches" is off.
+ */
+static
+int onMatch(ScanPCREContext *sc) {
+    assert(sc);
+    sc->result.matches++;
+
+    return 0;
+}
+
+/**
+ * Function called for every match that PCRE produces when "echo
+ * matches" is enabled.
+ */
+static
+int onMatchEcho(unsigned int id, unsigned long long, unsigned long long to,
+                ScanPCREContext *sc) {
+    assert(sc);
+    sc->result.matches++;
+
+    printf("Match @%u:%llu for %u\n", sc->id, to, id);
+
+    return 0;
+}
+
+EnginePCRE::EnginePCRE(vector<unique_ptr<PcreDB>> dbs_in, CompilePCREStats cs,
+                       int capture_cnt_in)
+    : dbs(move(dbs_in)), compile_stats(move(cs)),
+      capture_cnt(capture_cnt_in) {}
+
+EnginePCRE::~EnginePCRE() {
+    for (auto &pcreDB : dbs) {
+        free(pcreDB->extra);
+        free(pcreDB->db);
+    }
+}
+
+unique_ptr<EngineContext> EnginePCRE::makeContext() const {
+    return ue2::make_unique<EnginePCREContext>(capture_cnt);
+}
+
+void EnginePCRE::scan(const char *data, unsigned int len, unsigned int id,
+                      ResultEntry &result, EngineContext &ectx) const {
+    assert(data);
+
+    ScanPCREContext sc(id, result);
+    auto &ctx = static_cast<EnginePCREContext &>(ectx);
+    int *ovec = ctx.ovec;
+    int ovec_size = (capture_cnt + 1) * 3;
+    for (const auto &pcreDB : dbs) {
+        int startoffset = 0;
+        bool utf8 = pcreDB->utf8;
+        bool highlander = pcreDB->highlander;
+
+        int flags = 0;
+        int ret;
+        do {
+            ret = pcre_exec(pcreDB->db, pcreDB->extra, data, len,
+                            startoffset, flags, ovec, ovec_size);
+            if (ret <= PCRE_ERROR_NOMATCH) {
+                break;
+            }
+
+            int from = ovec[0];
+            int to = ovec[1];
+            assert(from <= to);
+
+            if (echo_matches) {
+                onMatchEcho(pcreDB->id, from, to, &sc);
+            } else {
+                onMatch(&sc);
+            }
+
+            // If we only wanted a single match, we're done.
+            if (highlander) {
+                break;
+            }
+
+            // Next scan starts at the first codepoint after the match. It's
+            // possible that we have a vacuous match, in which case we must step
+            // past it to ensure that we always progress.
+            if (from != to) {
+                startoffset = to;
+            } else if (utf8) {
+                startoffset = to + 1;
+                while (startoffset < (int)len &&
+                       ((data[startoffset] & 0xc0) == UTF_CONT_BYTE_HEADER)) {
+                    ++startoffset;
+                }
+            } else {
+                startoffset = to + 1;
+            }
+        } while (startoffset <= (int)len);
+
+        if (ret < PCRE_ERROR_NOMATCH) {
+            printf("Fatal error: pcre returned error %d\n", ret);
+            abort();
+        }
+    }
+}
+
+// vectoring scan
+void EnginePCRE::scan_vectored(UNUSED const char *const *data,
+                               UNUSED const unsigned int *len,
+                               UNUSED unsigned int count,
+                               UNUSED unsigned int streamId,
+                               UNUSED ResultEntry &result,
+                               UNUSED EngineContext &ectx) const {
+    printf("PCRE matcher can't support vectored mode.\n");
+    abort();
+}
+
+unique_ptr<EngineStream> EnginePCRE::streamOpen(UNUSED EngineContext &ectx,
+                                                UNUSED unsigned id) const {
+    printf("PCRE matcher can't stream.\n");
+    abort();
+}
+
+void EnginePCRE::streamClose(UNUSED unique_ptr<EngineStream> stream,
+                             UNUSED ResultEntry &result) const {
+    printf("PCRE matcher can't stream.\n");
+    abort();
+}
+
+void EnginePCRE::streamScan(UNUSED EngineStream &stream,
+                            UNUSED const char *data,
+                            UNUSED unsigned len, UNUSED unsigned id,
+                            UNUSED ResultEntry &result) const {
+    printf("PCRE matcher can't stream.\n");
+    abort();
+}
+
+void EnginePCRE::streamCompressExpand(UNUSED EngineStream &stream,
+                                      UNUSED vector<char> &temp) const {
+    printf("PCRE matcher can't stream.\n");
+    abort();
+}
+
+void EnginePCRE::printStats() const {
+    // Output summary information.
+    if (!compile_stats.sigs_name.empty()) {
+        printf("Signature set:        %s\n", compile_stats.sigs_name.c_str());
+    }
+    printf("Signatures:        %s\n", compile_stats.signatures.c_str());
+    printf("PCRE info:         %s\n", compile_stats.db_info.c_str());
+    printf("Expression count:  %'zu\n", compile_stats.expressionCount);
+    printf("Bytecode size:     %'zu bytes\n", compile_stats.compiledSize);
+    printf("Scratch size:      %'zu bytes\n", compile_stats.scratchSize);
+    printf("Compile time:      %'0.3Lf seconds\n", compile_stats.compileSecs);
+    printf("Peak heap usage:   %'u bytes\n", compile_stats.peakMemorySize);
+}
+
+void EnginePCRE::sqlStats(SqlDB &sqldb) const {
+    ostringstream crc;
+
+    static const string Q =
+        "INSERT INTO Compile ("
+            "sigsName, signatures, dbInfo, exprCount, dbSize, crc,"
+            "scratchSize, compileSecs, peakMemory) "
+        "VALUES (?1, ?2, ?3, ?4, ?5, ?6, ?7, ?8, ?9)";
+
+    sqldb.insert_all(Q, compile_stats.sigs_name, compile_stats.signatures,
+                     compile_stats.db_info, compile_stats.expressionCount,
+                     compile_stats.compiledSize, crc.str(),
+                     compile_stats.scratchSize, compile_stats.compileSecs,
+                     compile_stats.peakMemorySize);
+}
+
+static
+bool decodeExprPCRE(string &expr, unsigned *flags, struct PcreDB &db) {
+    if (expr[0] != '/') {
+        return false;
+    }
+
+    size_t end = expr.find_last_of('/');
+    if (end == string::npos) {
+        return false;
+    }
+    string strFlags = expr.substr(end + 1, expr.length() - end - 1);
+
+    // strip starting and trailing slashes and the flags
+    expr.erase(end, expr.length() - end);
+    expr.erase(0, 1);
+
+    // decode the flags
+    *flags = 0;
+    for (size_t i = 0; i != strFlags.length(); ++i) {
+        switch (strFlags[i]) {
+            case 's':
+                *flags |= PCRE_DOTALL;
+                break;
+            case 'm':
+                *flags |= PCRE_MULTILINE;
+                break;
+            case 'i':
+                *flags |= PCRE_CASELESS;
+                break;
+            case '8':
+                *flags |= PCRE_UTF8;
+                db.utf8 = true;
+                break;
+            case 'W':
+                *flags |= PCRE_UCP;
+                break;
+            case 'H':
+                db.highlander = true;
+                break;
+            default:
+                return false;
+        }
+    }
+
+    return true;
+}
+
+unique_ptr<EnginePCRE>
+buildEnginePcre(const ExpressionMap &expressions, const string &name,
+                const string &sigs_name) {
+    if (expressions.empty()) {
+        assert(0);
+        return nullptr;
+    }
+
+    long double compileSecs = 0.0;
+    size_t compiledSize = 0.0;
+    unsigned int peakMemorySize = 0;
+    string db_info("Version: ");
+    db_info += string(pcre_version());
+
+    vector<unique_ptr<PcreDB>> dbs;
+    int capture_cnt = 0;
+
+    Timer timer;
+    timer.start();
+
+    for (const auto &m : expressions) {
+        string expr(m.second);
+        unsigned int flags = 0;
+        auto pcreDB = ue2::make_unique<PcreDB>();
+        if (!decodeExprPCRE(expr, &flags, *pcreDB)) {
+            printf("Error parsing PCRE: %s (id %u)\n", m.second.c_str(),
+                    m.first);
+            return nullptr;
+        }
+
+        const char *errp;
+        int erro;
+        pcre *db = pcre_compile(expr.c_str(), flags, &errp, &erro, NULL);
+
+        if (!db) {
+            printf("Compile error %s\n", errp);
+            return nullptr;
+        }
+
+        pcre_extra *extra = pcre_study(db, PCRE_STUDY_JIT_COMPILE, &errp);
+        if (errp) {
+            printf("PCRE could not be studied: %s\n", errp);
+            return nullptr;
+        }
+        if (!extra) {
+            extra = (pcre_extra *)malloc(sizeof(pcre_extra));
+        }
+        int cap = 0; // PCRE_INFO_CAPTURECOUNT demands an int
+        if (pcre_fullinfo(db, extra, PCRE_INFO_CAPTURECOUNT, &cap)) {
+            printf("PCRE fullinfo error\n");
+            free(extra);
+            free(db);
+            return nullptr;
+        }
+        assert(cap >= 0);
+        capture_cnt = max(capture_cnt, cap);
+
+        size_t db_size = 0;
+        if (pcre_fullinfo(db, extra, PCRE_INFO_SIZE, &db_size)) {
+            printf("PCRE fullinfo error\n");
+            free(extra);
+            free(db);
+            return nullptr;
+        }
+
+        size_t study_size = 0;
+        if (pcre_fullinfo(db, extra, PCRE_INFO_STUDYSIZE,
+            &study_size)) {
+            printf("PCRE fullinfo error\n");
+            free(extra);
+            free(db);
+            return nullptr;
+        }
+        compiledSize += db_size + study_size;
+
+        pcreDB->id = m.first;
+        pcreDB->db = db;
+
+        extra->flags =
+            PCRE_EXTRA_MATCH_LIMIT | PCRE_EXTRA_MATCH_LIMIT_RECURSION;
+        extra->match_limit = 10000000;
+        extra->match_limit_recursion = 1500;
+
+        pcreDB->extra = extra;
+        dbs.push_back(move(pcreDB));
+    }
+
+    timer.complete();
+    compileSecs = timer.seconds();
+    peakMemorySize = getPeakHeap();
+
+    // Collect summary information.
+    CompilePCREStats cs;
+    cs.sigs_name = sigs_name;
+    if (!sigs_name.empty()) {
+        const auto pos = name.find_last_of('/');
+        cs.signatures = name.substr(pos + 1);
+    } else {
+        cs.signatures = name;
+    }
+    cs.db_info = db_info;
+    cs.expressionCount = expressions.size();
+    cs.compiledSize = compiledSize;
+    cs.scratchSize = (capture_cnt  + 1) * sizeof(int) * 3;
+    cs.compileSecs = compileSecs;
+    cs.peakMemorySize = peakMemorySize;
+
+    return ue2::make_unique<EnginePCRE>(move(dbs), move(cs), capture_cnt);
+}

tools/hsbench/engine_pcre.h

@@ -0,0 +1,114 @@
+/*
+ * Copyright (c) 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.
+ */
+
+#ifndef ENGINEPCRE_H
+#define ENGINEPCRE_H
+
+#include "expressions.h"
+#include "engine.h"
+
+#include <pcre.h>
+
+#include <memory>
+#include <string>
+#include <vector>
+
+/** Infomation about the database compile */
+struct CompilePCREStats {
+    std::string sigs_name;
+    std::string signatures;
+    std::string db_info;
+    size_t expressionCount = 0;
+    size_t compiledSize = 0;
+    size_t scratchSize = 0;
+    long double compileSecs = 0;
+    unsigned int peakMemorySize = 0;
+};
+
+/** Engine context which is allocated on a per-thread basis. */
+class EnginePCREContext : public EngineContext{
+public:
+    explicit EnginePCREContext(int capture_cnt);
+    ~EnginePCREContext();
+
+    int *ovec = nullptr;
+};
+
+struct PcreDB {
+    bool highlander = false;
+    bool utf8 = false;
+    u32 id;
+    pcre *db = nullptr;
+    pcre_extra *extra = nullptr;
+};
+
+/** PCRE Engine for scanning data. */
+class EnginePCRE : public Engine {
+public:
+    explicit EnginePCRE(std::vector<std::unique_ptr<PcreDB>> dbs_in,
+                        CompilePCREStats cs, int capture_cnt_in);
+    ~EnginePCRE();
+
+    std::unique_ptr<EngineContext> makeContext() const;
+
+    void scan(const char *data, unsigned int len, unsigned int id,
+              ResultEntry &result, EngineContext &ectx) const;
+
+    void scan_vectored(const char *const *data, const unsigned int *len,
+                       unsigned int count, unsigned int streamId,
+                       ResultEntry &result, EngineContext &ectx) const;
+
+    std::unique_ptr<EngineStream> streamOpen(EngineContext &ectx,
+                                             unsigned id) const;
+
+    void streamClose(std::unique_ptr<EngineStream> stream,
+                     ResultEntry &result) const;
+
+    void streamCompressExpand(EngineStream &stream,
+                              std::vector<char> &temp) const;
+
+    void streamScan(EngineStream &stream, const char *data, unsigned int len,
+                    unsigned int id, ResultEntry &result) const;
+
+    void printStats() const;
+
+    void sqlStats(SqlDB &db) const;
+
+private:
+    std::vector<std::unique_ptr<PcreDB>> dbs;
+
+    CompilePCREStats compile_stats;
+
+    int capture_cnt;
+};
+
+std::unique_ptr<EnginePCRE>
+buildEnginePcre(const ExpressionMap &expressions, const std::string &name,
+                const std::string &sigs_name);
+
+#endif // ENGINEPCRE_H

tools/hsbench/main.cpp

@@ -1,5 +1,5 @@
 /*
- * Copyright (c) 2016-2017, Intel Corporation
+ * Copyright (c) 2016-2018, Intel Corporation
  *
  * Redistribution and use in source and binary forms, with or without
  * modification, are permitted provided that the following conditions are met:
@@ -31,6 +31,10 @@
 #include "common.h"
 #include "data_corpus.h"
 #include "engine_hyperscan.h"
+#if defined(HS_HYBRID)
+#include "engine_chimera.h"
+#include "engine_pcre.h"
+#endif
 #include "expressions.h"
 #include "sqldb.h"
 #include "thread_barrier.h"
@@ -87,6 +91,8 @@ namespace /* anonymous */ {
 
 bool display_per_scan = false;
 ScanMode scan_mode = ScanMode::STREAMING;
+bool useHybrid = false;
+bool usePcre = false;
 unsigned repeats = 20;
 string exprPath("");
 string corpusFile("");
@@ -102,7 +108,7 @@ typedef void (*thread_func_t)(void *context);
 
 class ThreadContext : boost::noncopyable {
 public:
-    ThreadContext(unsigned num_in, const EngineHyperscan &db_in,
+    ThreadContext(unsigned num_in, const Engine &db_in,
                   thread_barrier &tb_in, thread_func_t function_in,
                   vector<DataBlock> corpus_data_in)
         : num(num_in), results(repeats), engine(db_in),
@@ -155,7 +161,7 @@ public:
     unsigned num;
     Timer timer;
     vector<ResultEntry> results;
-    const EngineHyperscan &engine;
+    const Engine &engine;
     unique_ptr<EngineContext> enginectx;
     vector<DataBlock> corpus_data;
 
@@ -181,6 +187,10 @@ void usage(const char *error) {
            " (default: streaming).\n");
     printf("  -V              Benchmark in vectored mode"
            " (default: streaming).\n");
+#if defined(HS_HYBRID)
+    printf("  -H              Benchmark using Chimera (if supported).\n");
+    printf("  -P              Benchmark using PCRE (if supported).\n");
+#endif
 #ifdef HAVE_DECL_PTHREAD_SETAFFINITY_NP
     printf("  -T CPU,CPU,...  Benchmark with threads on these CPUs.\n");
 #endif
@@ -214,7 +224,7 @@ struct BenchmarkSigs {
 static
 void processArgs(int argc, char *argv[], vector<BenchmarkSigs> &sigSets,
                  UNUSED unique_ptr<Grey> &grey) {
-    const char options[] = "-b:c:Cd:e:E:G:hi:n:No:p:sS:Vw:z:"
+    const char options[] = "-b:c:Cd:e:E:G:hHi:n:No:p:PsS:Vw:z:"
 #ifdef HAVE_DECL_PTHREAD_SETAFFINITY_NP
         "T:" // add the thread flag
 #endif
@@ -287,6 +297,14 @@ void processArgs(int argc, char *argv[], vector<BenchmarkSigs> &sigSets,
             usage(nullptr);
             exit(0);
             break;
+        case 'H':
+#if defined(HS_HYBRID)
+            useHybrid = true;
+#else
+            usage("Hybrid matcher not enabled in this build");
+            exit(1);
+#endif
+            break;
         case 'n':
             if (!fromString(optarg, repeats) || repeats == 0) {
                 usage("Couldn't parse argument to -n flag, should be"
@@ -294,6 +312,14 @@ void processArgs(int argc, char *argv[], vector<BenchmarkSigs> &sigSets,
                 exit(1);
             }
             break;
+        case 'P':
+#if defined(HS_HYBRID)
+            usePcre = true;
+#else
+            usage("PCRE matcher not enabled in this build");
+            exit(1);
+#endif
+            break;
         case 's':
             in_sigfile = 2;
             break;
@@ -399,6 +425,24 @@ void processArgs(int argc, char *argv[], vector<BenchmarkSigs> &sigSets,
         exit(1);
     }
 
+    // Constraints on Chimera and PCRE engines
+    if (useHybrid || usePcre) {
+        if (useHybrid && usePcre) {
+            usage("Can't run both Chimera and PCRE.");
+            exit(1);
+        }
+        if (scan_mode != ScanMode::BLOCK) {
+            usage("Must specify block mode in Chimera or PCRE with "
+                  "the -N option.");
+            exit(1);
+        }
+
+        if (forceEditDistance || loadDatabases || saveDatabases) {
+            usage("No extended options are supported in Chimera or PCRE.");
+            exit(1);
+        }
+    }
+
     // Read in any -s signature sets.
     for (const auto &file : sigFiles) {
         SignatureSet sigs;
@@ -503,7 +547,7 @@ static
 void benchStreamingInternal(ThreadContext *ctx, vector<StreamInfo> &streams,
                             bool do_compress) {
     assert(ctx);
-    const EngineHyperscan &e = ctx->engine;
+    const Engine &e = ctx->engine;
     const vector<DataBlock> &blocks = ctx->corpus_data;
     vector<char> compress_buf(do_compress ? 1000 : 0);
 
@@ -812,7 +856,7 @@ void sqlResults(const vector<unique_ptr<ThreadContext>> &threads,
  * the same copy of the data.
  */
 static
-unique_ptr<ThreadContext> makeThreadContext(const EngineHyperscan &db,
+unique_ptr<ThreadContext> makeThreadContext(const Engine &db,
                                             const vector<DataBlock> &blocks,
                                             unsigned id,
                                             thread_barrier &sync_barrier) {
@@ -839,7 +883,7 @@ unique_ptr<ThreadContext> makeThreadContext(const EngineHyperscan &db,
 
 /** Run the given benchmark. */
 static
-void runBenchmark(const EngineHyperscan &db,
+void runBenchmark(const Engine &db,
                   const vector<DataBlock> &corpus_blocks) {
     size_t numThreads;
     bool useAffinity = false;
@@ -936,8 +980,18 @@ int main(int argc, char *argv[]) {
                 continue;
             }
 
-            auto engine = buildEngineHyperscan(exprMap, scan_mode, s.name,
-                                               sigName, *grey);
+            unique_ptr<Engine> engine;
+            if (useHybrid) {
+#if defined(HS_HYBRID)
+                engine = buildEngineChimera(exprMap, s.name, sigName);
+            } else if (usePcre) {
+                engine = buildEnginePcre(exprMap, s.name, sigName);
+#endif
+            } else {
+                engine = buildEngineHyperscan(exprMap, scan_mode, s.name,
+                                              sigName, *grey);
+            }
+
             if (!engine) {
                 printf("Error: expressions failed to compile.\n");
                 exit(1);

tools/hscheck/CMakeLists.txt

@@ -5,6 +5,14 @@ set(CMAKE_CXX_FLAGS "${CMAKE_CXX_FLAGS} ${EXTRA_CXX_FLAGS}")
 SET(hscheck_SOURCES
     main.cpp
 )
-add_executable(hscheck ${hscheck_SOURCES})
-target_link_libraries(hscheck hs expressionutil pthread)
+
+if (BUILD_CHIMERA)
+    include_directories(${PCRE_INCLUDE_DIRS})
+    add_definitions(-DHS_HYBRID)
+    add_executable(hscheck ${hscheck_SOURCES})
+    target_link_libraries(hscheck hs chimera ${PCRE_LDFLAGS} expressionutil pthread)
+else()
+    add_executable(hscheck ${hscheck_SOURCES})
+    target_link_libraries(hscheck hs expressionutil pthread)
+endif()
 

tools/hscheck/main.cpp

@@ -59,6 +59,11 @@
 #include "hs_internal.h"
 #include "ue2common.h"
 
+#ifdef HS_HYBRID
+#include <pcre.h>
+#include "chimera/ch.h"
+#endif
+
 #include <cassert>
 #include <fstream>
 #include <mutex>
@@ -77,6 +82,7 @@ namespace /* anonymous */ {
 // are we in streaming mode? (default: yes)
 bool g_streaming = true;
 bool g_vectored = false;
+bool g_hybrid = false;
 string g_exprPath("");
 string g_signatureFile("");
 bool g_allSignatures = false;
@@ -282,34 +288,57 @@ void checkExpression(UNUSED void *threadarg) {
 
         // Try and compile a database.
         const char *regexp = regex.c_str();
-        const hs_expr_ext *extp = &ext;
 
         hs_error_t err;
-        hs_compile_error_t *compile_err;
-        hs_database_t *db = nullptr;
+
+        if (g_hybrid) {
+#ifdef HS_HYBRID
+            ch_compile_error_t *ch_compile_err;
+            ch_database_t *hybrid_db = nullptr;
+            err = ch_compile_multi(&regexp, &flags, nullptr, 1, CH_MODE_GROUPS,
+                                   nullptr, &hybrid_db, &ch_compile_err);
+            if (err == HS_SUCCESS) {
+                assert(hybrid_db);
+                recordSuccess(g_exprMap, it->first);
+                ch_free_database(hybrid_db);
+            } else {
+                assert(!hybrid_db);
+                assert(ch_compile_err);
+                recordFailure(g_exprMap, it->first, ch_compile_err->message);
+                ch_free_compile_error(ch_compile_err);
+            }
+#else
+            cerr << "Hybrid mode not available in this build." << endl;
+            exit(1);
+#endif // HS_HYBRID
+        } else {
+            const hs_expr_ext *extp = &ext;
+            hs_compile_error_t *compile_err;
+            hs_database_t *db = nullptr;
 
 #if !defined(RELEASE_BUILD)
-        // This variant is available in non-release builds and allows us to
-        // modify greybox settings.
-        err = hs_compile_multi_int(&regexp, &flags, nullptr, &extp, 1, mode,
-                                   nullptr, &db, &compile_err, *g_grey);
+            // This variant is available in non-release builds and allows us to
+            // modify greybox settings.
+            err = hs_compile_multi_int(&regexp, &flags, nullptr, &extp, 1, mode,
+                                       nullptr, &db, &compile_err, *g_grey);
 #else
-        err = hs_compile_ext_multi(&regexp, &flags, nullptr, &extp, 1, mode,
-                                   nullptr, &db, &compile_err);
+            err = hs_compile_ext_multi(&regexp, &flags, nullptr, &extp, 1, mode,
+                                       nullptr, &db, &compile_err);
 #endif
 
-        if (err == HS_SUCCESS) {
-            assert(db);
-            recordSuccess(g_exprMap, it->first);
-            hs_free_database(db);
-            if (check_logical) {
-                cacheSubExpr(it->first, regex, flags, ext);
+            if (err == HS_SUCCESS) {
+                assert(db);
+                recordSuccess(g_exprMap, it->first);
+                hs_free_database(db);
+                if (check_logical) {
+                    cacheSubExpr(it->first, regex, flags, ext);
+                }
+            } else {
+                assert(!db);
+                assert(compile_err);
+                recordFailure(g_exprMap, it->first, compile_err->message);
+                hs_free_compile_error(compile_err);
             }
-        } else {
-            assert(!db);
-            assert(compile_err);
-            recordFailure(g_exprMap, it->first, compile_err->message);
-            hs_free_compile_error(compile_err);
         }
     }
 }
@@ -429,6 +458,9 @@ void usage() {
 #endif
          << "  -V              Operate in vectored mode." << endl
          << "  -N              Operate in block mode (default: streaming)." << endl
+#ifdef HS_HYBRID
+         << "  -H              Operate in hybrid mode." << endl
+#endif
          << "  -L              Pass HS_FLAG_SOM_LEFTMOST for all expressions (default: off)." << endl
          << "  -8              Force UTF8 mode on all patterns." << endl
          << "  -T NUM          Run with NUM threads." << endl
@@ -440,7 +472,7 @@ void usage() {
 
 static
 void processArgs(int argc, char *argv[], UNUSED unique_ptr<Grey> &grey) {
-    const char options[] = "e:E:s:z:hLNV8G:T:BC";
+    const char options[] = "e:E:s:z:hHLNV8G:T:BC";
     bool signatureSet = false;
 
     for (;;) {
@@ -492,6 +524,9 @@ void processArgs(int argc, char *argv[], UNUSED unique_ptr<Grey> &grey) {
             g_streaming = false;
             g_vectored = true;
             break;
+        case 'H':
+            g_hybrid = true;
+            break;
         case 'T':
             num_of_threads = atoi(optarg);
             break;

tools/hscollider/CMakeLists.txt

@@ -1,9 +1,3 @@
-# we have a fixed requirement for PCRE
-set(PCRE_REQUIRED_MAJOR_VERSION 8)
-set(PCRE_REQUIRED_MINOR_VERSION 41)
-set(PCRE_REQUIRED_VERSION ${PCRE_REQUIRED_MAJOR_VERSION}.${PCRE_REQUIRED_MINOR_VERSION})
-
-include (${CMAKE_MODULE_PATH}/pcre.cmake)
 if (NOT CORRECT_PCRE_VERSION)
     message(STATUS "PCRE ${PCRE_REQUIRED_VERSION} not found, not building hscollider")
     return()
@@ -29,6 +23,8 @@ set_source_files_properties(
 
 ragelmaker(ColliderCorporaParser.rl)
 
+add_definitions(-DHS_HYBRID)
+
 # only set these after all tests are done
 set(CMAKE_C_FLAGS "${CMAKE_C_FLAGS} ${EXTRA_C_FLAGS}")
 set(CMAKE_CXX_FLAGS "${CMAKE_CXX_FLAGS} ${EXTRA_CXX_FLAGS}")
@@ -69,7 +65,7 @@ add_dependencies(hscollider ragel_ColliderCorporaParser)
 add_dependencies(hscollider pcre)
 
 if(NOT WIN32)
-    target_link_libraries(hscollider hs ${PCRE_LDFLAGS} databaseutil
+    target_link_libraries(hscollider hs chimera ${PCRE_LDFLAGS} databaseutil
         expressionutil corpusomatic crosscompileutil pthread
     "${BACKTRACE_LDFLAGS}")
 
@@ -78,7 +74,7 @@ if(HAVE_BACKTRACE)
         "${BACKTRACE_CFLAGS}")
 endif()
 else() # WIN32
-    target_link_libraries(hscollider hs ${PCRE_LDFLAGS} databaseutil
+    target_link_libraries(hscollider hs chimera ${PCRE_LDFLAGS} databaseutil
         expressionutil corpusomatic crosscompileutil)
 endif()
 

tools/hscollider/DatabaseProxy.h

@@ -1,5 +1,5 @@
 /*
- * Copyright (c) 2015-2016, Intel Corporation
+ * 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:
@@ -54,10 +54,10 @@ public:
     explicit DatabaseProxy(const std::set<unsigned> &expr_ids)
         : ids(expr_ids) {}
 
-    explicit DatabaseProxy(std::shared_ptr<HyperscanDB> built_db)
+    explicit DatabaseProxy(std::shared_ptr<BaseDB> built_db)
         : db(built_db) {}
 
-    std::shared_ptr<HyperscanDB> get(const UltimateTruth &ultimate) {
+    std::shared_ptr<BaseDB> get(const UltimateTruth &ultimate) {
         std::lock_guard<std::mutex> lock(mutex);
         if (failed) {
             // We have previously failed to compile this database.
@@ -80,7 +80,7 @@ public:
 
 private:
     std::mutex mutex;
-    std::shared_ptr<HyperscanDB> db;
+    std::shared_ptr<BaseDB> db;
     std::set<unsigned> ids;
     bool failed = false; // Database failed compilation.
 };

tools/hscollider/GroundTruth.cpp

@@ -187,6 +187,14 @@ string pcreErrStr(int err) {
     }
 }
 
+/* that is, a mode provided by native hyperscan */
+static
+bool isStandardMode(unsigned int mode) {
+    return mode == MODE_BLOCK
+        || mode == MODE_STREAMING
+        || mode == MODE_VECTORED;
+}
+
 GroundTruth::GroundTruth(ostream &os, const ExpressionMap &expr,
                          unsigned long int limit,
                          unsigned long int limit_recursion)
@@ -194,8 +202,10 @@ GroundTruth::GroundTruth(ostream &os, const ExpressionMap &expr,
       matchLimitRecursion(limit_recursion) {}
 
 void GroundTruth::global_prep() {
-    // We're using pcre callouts
-    pcre_callout = &pcreCallOut;
+    if (isStandardMode(colliderMode)) {
+        // We're using pcre callouts
+        pcre_callout = &pcreCallOut;
+    }
 }
 
 static
@@ -262,11 +272,17 @@ GroundTruth::compile(unsigned id, bool no_callouts) {
         throw PcreCompileFailure("Unsupported extended flags.");
     }
 
+    // Hybrid mode implies SOM.
+    if (colliderMode == MODE_HYBRID) {
+        assert(!use_NFA);
+        som = true;
+    }
+
     // SOM flags might be set globally.
     som |= !!somFlags;
 
     // For traditional Hyperscan, add global callout to pattern.
-    if (!combination && !no_callouts) {
+    if (!combination && !no_callouts && isStandardMode(colliderMode)) {
         addCallout(re);
     }
 
@@ -403,6 +419,79 @@ int scanBasic(const CompiledPcre &compiled, const string &buffer,
     return ret;
 }
 
+static
+bool isUtf8(const CompiledPcre &compiled) {
+    unsigned long int options = 0;
+    pcre_fullinfo(compiled.bytecode, NULL, PCRE_INFO_OPTIONS, &options);
+    return options & PCRE_UTF8;
+}
+
+static
+CaptureVec makeCaptureVec(const vector<int> &ovector, int ret) {
+    assert(ret > 0);
+
+    CaptureVec cap;
+
+    if (no_groups) {
+        return cap; // No group info requested.
+    }
+
+    cap.reserve(ret * 2);
+    for (int i = 0; i < ret * 2; i += 2) {
+        int from = ovector[i], to = ovector[i + 1];
+        cap.push_back(make_pair(from, to));
+    }
+    return cap;
+}
+
+static
+int scanHybrid(const CompiledPcre &compiled, const string &buffer,
+               const pcre_extra &extra, vector<int> &ovector,
+               ResultSet &rs, ostream &out) {
+    int len = (int)buffer.length();
+    int startoffset = 0;
+    bool utf8 = isUtf8(compiled);
+
+    int flags = 0;
+    int ret;
+    do {
+        ret = pcre_exec(compiled.bytecode, &extra, buffer.c_str(), len,
+                        startoffset, flags, &ovector[0], ovector.size());
+
+        if (ret <= PCRE_ERROR_NOMATCH) {
+            return ret;
+        }
+
+        int from = ovector.at(0);
+        int to = ovector.at(1);
+        rs.addMatch(from, to, makeCaptureVec(ovector, ret));
+
+        if (echo_matches) {
+            out << "PCRE Match @ (" << from << "," << to << ")" << endl;
+        }
+
+        // If we only wanted a single match, we're done.
+        if (compiled.highlander) break;
+
+        // Next scan starts at the first codepoint after the match. It's
+        // possible that we have a vacuous match, in which case we must step
+        // past it to ensure that we always progress.
+        if (from != to) {
+            startoffset = to;
+        } else if (utf8) {
+            startoffset = to + 1;
+            while (startoffset < len
+                   && ((buffer[startoffset] & 0xc0) == UTF_CONT_BYTE_HEADER)) {
+                ++startoffset;
+            }
+        } else {
+            startoffset = to + 1;
+        }
+    } while (startoffset <= len);
+
+    return ret;
+}
+
 static
 int scanOffset(const CompiledPcre &compiled, const string &buffer,
                const pcre_extra &extra, vector<int> &ovector,
@@ -532,15 +621,24 @@ bool GroundTruth::run(unsigned, const CompiledPcre &compiled,
     pcre_extra extra;
     extra.flags = 0;
 
-    // Switch on callouts.
-    extra.flags |= PCRE_EXTRA_CALLOUT_DATA;
-    extra.callout_data = &ctx;
+    // If running in traditional HyperScan mode, switch on callouts.
+    bool usingCallouts = isStandardMode(colliderMode);
+    if (usingCallouts) {
+        // Switch on callouts.
+        extra.flags |= PCRE_EXTRA_CALLOUT_DATA;
+        extra.callout_data = &ctx;
+    }
 
     // Set the match_limit (in order to bound execution time on very complex
     // patterns)
     extra.flags |= (PCRE_EXTRA_MATCH_LIMIT | PCRE_EXTRA_MATCH_LIMIT_RECURSION);
-    extra.match_limit = matchLimit;
-    extra.match_limit_recursion = matchLimitRecursion;
+    if (colliderMode == MODE_HYBRID) {
+        extra.match_limit = 10000000;
+        extra.match_limit_recursion = 1500;
+    } else {
+        extra.match_limit = matchLimit;
+        extra.match_limit_recursion = matchLimitRecursion;
+    }
 
 #ifdef PCRE_NO_START_OPTIMIZE
     // Switch off optimizations that may result in callouts not occurring.
@@ -553,6 +651,7 @@ bool GroundTruth::run(unsigned, const CompiledPcre &compiled,
     ovector.resize(ovecsize);
 
     int ret;
+    bool hybrid = false;
     switch (colliderMode) {
     case MODE_BLOCK:
     case MODE_STREAMING:
@@ -563,6 +662,10 @@ bool GroundTruth::run(unsigned, const CompiledPcre &compiled,
             ret = scanBasic(compiled, buffer, extra, ovector, ctx);
         }
         break;
+    case MODE_HYBRID:
+        ret = scanHybrid(compiled, buffer, extra, ovector, rs, out);
+        hybrid = true;
+        break;
     default:
         assert(0);
         ret = PCRE_ERROR_NULL;
@@ -595,7 +698,7 @@ bool GroundTruth::run(unsigned, const CompiledPcre &compiled,
         return true;
     }
 
-    if (compiled.som) {
+    if (compiled.som && !hybrid) {
         filterLeftmostSom(rs);
     }
 

tools/hscollider/ResultSet.h

@@ -35,25 +35,36 @@
 #include <utility>
 #include <vector>
 
+// Type for capturing groups: a vector of (from, to) offsets, with both set to
+// -1 for inactive groups (like pcre's ovector). Used by hybrid modes.
+typedef std::vector<std::pair<int, int> > CaptureVec;
+
 // Class representing a single match, encapsulating to/from offsets.
 class MatchResult {
 public:
     MatchResult(unsigned long long start, unsigned long long end)
         : from(start), to(end) {}
+    MatchResult(unsigned long long start, unsigned long long end,
+                const CaptureVec &cap)
+            : from(start), to(end), captured(cap) {}
 
     bool operator<(const MatchResult &a) const {
         if (from != a.from) {
             return from < a.from;
         }
-        return to < a.to;
+        if (to != a.to) {
+            return to < a.to;
+        }
+        return captured < a.captured;
     }
 
     bool operator==(const MatchResult &a) const {
-        return from == a.from && to == a.to;
+        return from == a.from && to == a.to && captured == a.captured;
     }
 
     unsigned long long from;
     unsigned long long to;
+    CaptureVec captured;
 };
 
 enum ResultSource {
@@ -114,6 +125,19 @@ public:
         }
     }
 
+    // Add a match (with capturing vector)
+    void addMatch(unsigned long long from, unsigned long long to,
+                  const CaptureVec &cap, int block = 0) {
+        MatchResult m(from, to, cap);
+        matches.insert(m);
+
+        if (matches_by_block[block].find(m) != matches_by_block[block].end()) {
+            dupe_matches.insert(m);
+        } else {
+            matches_by_block[block].insert(m);
+        }
+    }
+
     // Clear all matches.
     void clear() {
         matches.clear();

tools/hscollider/UltimateTruth.cpp

@@ -1,5 +1,5 @@
 /*
- * Copyright (c) 2015-2017, Intel Corporation
+ * 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:
@@ -90,19 +90,14 @@ hs_error_t open_magic_stream(const hs_database_t *db, unsigned flags,
 
 #endif // RELEASE_BUILD
 
-class HyperscanDB : boost::noncopyable {
+class BaseDB : boost::noncopyable {
 public:
     // Constructor takes iterators over a container of pattern IDs.
     template <class Iter>
-    HyperscanDB(hs_database_t *db_in, Iter ids_begin, Iter ids_end)
-        : db(db_in), ids(ids_begin, ids_end) {}
+    BaseDB(Iter ids_begin, Iter ids_end)
+        : ids(ids_begin, ids_end) {}
 
-    ~HyperscanDB() {
-        hs_free_database(db);
-    }
-
-    // Underlying Hyperscan database pointer.
-    hs_database_t *db;
+    virtual ~BaseDB();
 
     // The set of expression IDs that must return their matches in order.
     unordered_set<unsigned> ordered;
@@ -111,15 +106,55 @@ public:
     unordered_set<unsigned> ids;
 };
 
+BaseDB::~BaseDB() { }
+
+class HyperscanDB : public BaseDB {
+public:
+    // Constructor takes iterators over a container of pattern IDs.
+    template <class Iter>
+    HyperscanDB(hs_database_t *db_in, Iter ids_begin, Iter ids_end)
+        : BaseDB(ids_begin, ids_end), db(db_in) {}
+
+    ~HyperscanDB();
+
+    // Underlying Hyperscan database pointer.
+    hs_database_t *db;
+};
+
+HyperscanDB::~HyperscanDB() {
+    hs_free_database(db);
+}
+
+#ifdef HS_HYBRID
+
+class HybridDB : public BaseDB {
+public:
+    // Constructor takes iterators over a container of pattern IDs.
+    template <class Iter>
+    HybridDB(ch_database_t *db_in, Iter ids_begin, Iter ids_end)
+        : BaseDB(ids_begin, ids_end), db(db_in) {}
+
+    ~HybridDB();
+
+    // Underlying Hyperscan database pointer.
+    ch_database_t *db;
+};
+
+HybridDB::~HybridDB() {
+    ch_free_database(db);
+}
+
+#endif // HS_HYBRID
+
 // Used to track the ID and result set.
 namespace {
 struct MultiContext {
-    MultiContext(unsigned int id_in, const HyperscanDB &db_in, ResultSet *rs_in,
+    MultiContext(unsigned int id_in, const BaseDB &db_in, ResultSet *rs_in,
                  bool single_in, ostream &os)
         : id(id_in), db(db_in), rs(rs_in), single(single_in), out(os) {}
     unsigned int id;
     int block = 0;
-    const HyperscanDB &db;
+    const BaseDB &db;
     ResultSet *rs;
     u64a lastRawMatch = 0; /* store last known unadjusted match location */
     u64a lastOrderMatch = 0;
@@ -230,6 +265,75 @@ int callbackMulti(unsigned int id, unsigned long long from,
     return 0;
 }
 
+#ifdef HS_HYBRID
+
+// Hybrid matcher callback.
+static
+ch_callback_t callbackHybrid(unsigned id, unsigned long long from,
+                             unsigned long long to, unsigned, unsigned size,
+                             const ch_capture_t *captured, void *ctx) {
+    MultiContext *mctx = static_cast<MultiContext *>(ctx);
+    assert(mctx);
+    assert(mctx->rs);
+    assert(mctx->in_scan_call);
+
+    ostream &out = mctx->out;
+
+    to -= g_corpora_prefix.size();
+
+    if (mctx->terminated) {
+        out << "UE2 Match @ (" << from << "," << to << ") for " << id
+            << " after termination" << endl;
+        mctx->rs->match_after_halt = true;
+    }
+
+    if (mctx->single || id == mctx->id) {
+        CaptureVec cap;
+        for (unsigned int i = 0; i < size; i++) {
+            if (!(captured[i].flags & CH_CAPTURE_FLAG_ACTIVE)) {
+                cap.push_back(make_pair(-1, -1));
+            } else {
+                cap.push_back(make_pair(captured[i].from, captured[i].to));
+            }
+        }
+        mctx->rs->addMatch(from, to, cap);
+    }
+
+    if (echo_matches) {
+        out << "Match @ [" << from << "," << to << "] for " << id << endl;
+        out << "  Captured " << size << " groups: ";
+        for (unsigned int i = 0; i < size; i++) {
+            if (!(captured[i].flags & CH_CAPTURE_FLAG_ACTIVE)) {
+                out << "{} ";
+            } else {
+                out << "{" << captured[i].from << "," << captured[i].to << "} ";
+            }
+        }
+        out << endl;
+    }
+
+    if (limit_matches && mctx->rs->matches.size() == limit_matches) {
+        mctx->terminated = true;
+        return CH_CALLBACK_TERMINATE;
+    }
+
+    return CH_CALLBACK_CONTINUE;
+}
+
+// Hybrid matcher error callback.
+static
+ch_callback_t errorCallback(UNUSED ch_error_event_t errorType, UNUSED unsigned int id, void *,
+                            void *ctx) {
+    UNUSED MultiContext *mctx = static_cast<MultiContext *>(ctx);
+    assert(mctx);
+    assert(mctx->rs);
+    assert(mctx->in_scan_call);
+
+    return CH_CALLBACK_SKIP_PATTERN;
+}
+
+#endif // HS_HYBRID
+
 static
 void filterLeftmostSom(ResultSet &rs) {
     if (rs.matches.size() <= 1) {
@@ -252,6 +356,9 @@ UltimateTruth::UltimateTruth(ostream &os, const ExpressionMap &expr,
                              const Grey &grey_in, unsigned int streamBlocks)
     : grey(grey_in), out(os), m_expr(expr), m_xcompile(false),
       m_streamBlocks(streamBlocks), scratch(nullptr),
+#ifdef HS_HYBRID
+      chimeraScratch(nullptr),
+#endif
       platform(plat) {
     // Build our mode flags.
 
@@ -265,15 +372,27 @@ UltimateTruth::UltimateTruth(ostream &os, const ExpressionMap &expr,
     case MODE_VECTORED:
         m_mode = HS_MODE_VECTORED;
         break;
+    case MODE_HYBRID:
+        m_mode = 0;
+        break;
     }
 
     // Set desired SOM precision, if we're in streaming mode.
     if (colliderMode == MODE_STREAMING) {
         m_mode |= somPrecisionMode;
     }
+
+#ifdef HS_HYBRID
+    if (colliderMode == MODE_HYBRID && !no_groups) {
+        m_mode |= CH_MODE_GROUPS;
+    }
+#endif
 }
 
 UltimateTruth::~UltimateTruth() {
+#ifdef HS_HYBRID
+    ch_free_scratch(chimeraScratch);
+#endif
     hs_free_scratch(scratch);
 }
 
@@ -327,13 +446,13 @@ void mangle_scratch(hs_scratch_t *scratch) {
     scratch->fdr_conf_offset = 0xe4;
 }
 
-bool UltimateTruth::blockScan(const HyperscanDB &hdb, const string &buffer,
+bool UltimateTruth::blockScan(const BaseDB &bdb, const string &buffer,
                               size_t align, match_event_handler callback,
                               void *ctx_in, ResultSet *) {
     assert(colliderMode == MODE_BLOCK);
     assert(!m_xcompile);
 
-    const hs_database_t *db = hdb.db;
+    const hs_database_t *db = reinterpret_cast<const HyperscanDB &>(bdb).db;
     assert(db);
     MultiContext *ctx = (MultiContext *)ctx_in;
 
@@ -438,13 +557,13 @@ hs_stream_t *compressAndResetExpandStream(const hs_database_t *db,
     return out;
 }
 
-bool UltimateTruth::streamingScan(const HyperscanDB &hdb, const string &buffer,
+bool UltimateTruth::streamingScan(const BaseDB &bdb, const string &buffer,
                                   size_t align, match_event_handler callback,
                                   void *ctx_in, ResultSet *rs) {
     assert(colliderMode == MODE_STREAMING);
     assert(!m_xcompile);
 
-    const hs_database_t *db = hdb.db;
+    const hs_database_t *db = reinterpret_cast<const HyperscanDB &>(bdb).db;
     assert(db);
     MultiContext *ctx = (MultiContext *)ctx_in;
 
@@ -594,13 +713,13 @@ bool UltimateTruth::streamingScan(const HyperscanDB &hdb, const string &buffer,
     return ret == HS_SUCCESS;
 }
 
-bool UltimateTruth::vectoredScan(const HyperscanDB &hdb, const string &buffer,
+bool UltimateTruth::vectoredScan(const BaseDB &bdb, const string &buffer,
                                  size_t align, match_event_handler callback,
                                  void *ctx_in, ResultSet *rs) {
     assert(colliderMode == MODE_VECTORED);
     assert(!m_xcompile);
 
-    const hs_database_t *db = hdb.db;
+    const hs_database_t *db = reinterpret_cast<const HyperscanDB &>(bdb).db;
     assert(db);
     MultiContext *ctx = (MultiContext *)ctx_in;
 
@@ -682,19 +801,67 @@ bool UltimateTruth::vectoredScan(const HyperscanDB &hdb, const string &buffer,
     return true;
 }
 
-bool UltimateTruth::run(unsigned int id, shared_ptr<const HyperscanDB> hdb,
+#ifdef HS_HYBRID
+bool UltimateTruth::hybridScan(const BaseDB &bdb, const string &buffer,
+                               size_t align, ch_match_event_handler callback,
+                               ch_error_event_handler error_callback,
+                               void *ctx_in, ResultSet *) {
+    assert(colliderMode == MODE_HYBRID);
+    assert(!m_xcompile);
+
+    const ch_database_t *db = reinterpret_cast<const HybridDB &>(bdb).db;
+    assert(db);
+    MultiContext *ctx = (MultiContext *)ctx_in;
+
+    char *realigned = setupScanBuffer(buffer.c_str(), buffer.size(), align);
+    if (!realigned) {
+        return false;
+    }
+
+    if (use_copy_scratch && !cloneScratch()) {
+        return false;
+    }
+
+    ctx->in_scan_call = true;
+    ch_error_t ret =
+        ch_scan(db, realigned, buffer.size(), 0, chimeraScratch, callback,
+                error_callback, ctx);
+    ctx->in_scan_call = false;
+
+    if (g_verbose) {
+        out << "Scan call returned " << ret << endl;
+    }
+
+    if (ctx->terminated) {
+        if (g_verbose && ret != CH_SCAN_TERMINATED) {
+            out << "Scan should have returned CH_SCAN_TERMINATED, returned "
+                 << ret << " instead." << endl;
+        }
+        return ret == CH_SCAN_TERMINATED;
+    }
+
+    if (g_verbose && ret != CH_SUCCESS) {
+        out << "Scan should have returned CH_SUCCESS, returned " << ret
+             << " instead." << endl;
+    }
+
+    return ret == CH_SUCCESS;
+}
+#endif
+
+bool UltimateTruth::run(unsigned int id, shared_ptr<const BaseDB> bdb,
                         const string &buffer, bool single_pattern,
                         unsigned int align, ResultSet &rs) {
     assert(!m_xcompile);
-    assert(hdb);
+    assert(bdb);
 
     // Ensure that scratch is appropriate for this database.
-    if (!allocScratch(hdb)) {
+    if (!allocScratch(bdb)) {
         out << "Scratch alloc failed." << endl;
         return false;
     }
 
-    MultiContext ctx(id, *hdb, &rs, single_pattern, out);
+    MultiContext ctx(id, *bdb, &rs, single_pattern, out);
     if (!g_corpora_suffix.empty()) {
         ctx.use_max_offset = true;
         ctx.max_offset = buffer.size() - g_corpora_suffix.size();
@@ -702,11 +869,20 @@ bool UltimateTruth::run(unsigned int id, shared_ptr<const HyperscanDB> hdb,
 
     switch (colliderMode) {
     case MODE_BLOCK:
-        return blockScan(*hdb, buffer, align, callbackMulti, &ctx, &rs);
+        return blockScan(*bdb, buffer, align, callbackMulti, &ctx, &rs);
     case MODE_STREAMING:
-        return streamingScan(*hdb, buffer, align, callbackMulti, &ctx, &rs);
+        return streamingScan(*bdb, buffer, align, callbackMulti, &ctx, &rs);
     case MODE_VECTORED:
-        return vectoredScan(*hdb, buffer, align, callbackMulti, &ctx, &rs);
+        return vectoredScan(*bdb, buffer, align, callbackMulti, &ctx, &rs);
+    case MODE_HYBRID:
+#ifdef HS_HYBRID
+        return hybridScan(*bdb, buffer, align, callbackHybrid, errorCallback,
+                          &ctx, &rs);
+#else
+        cerr << "Hybrid mode not available in this build." << endl;
+        abort();
+#endif
+        break;
     }
 
     assert(0);
@@ -739,7 +915,7 @@ bool isOrdered(const string &expr, unsigned int flags) {
     return ordered;
 }
 
-static unique_ptr<HyperscanDB>
+static unique_ptr<BaseDB>
 compileHyperscan(vector<const char *> &patterns, vector<unsigned> &flags,
                  vector<unsigned> &idsvec, ptr_vector<hs_expr_ext> &ext,
                  unsigned mode, const hs_platform_info *platform, string &error,
@@ -762,7 +938,30 @@ compileHyperscan(vector<const char *> &patterns, vector<unsigned> &flags,
     return ue2::make_unique<HyperscanDB>(db, idsvec.begin(), idsvec.end());
 }
 
-shared_ptr<HyperscanDB> UltimateTruth::compile(const set<unsigned> &ids,
+#ifdef HS_HYBRID
+static unique_ptr<BaseDB>
+compileHybrid(vector<const char *> &patterns,
+              vector<unsigned> &flags, vector<unsigned> &idsvec,
+              unsigned mode, const hs_platform_info *platform, string &error) {
+    const unsigned count = patterns.size();
+    ch_database_t *db = nullptr;
+    ch_compile_error_t *compile_err;
+
+    ch_error_t err = ch_compile_multi(&patterns[0], &flags[0],
+                                      &idsvec[0], count, mode, platform, &db,
+                                      &compile_err);
+
+    if (err != HS_SUCCESS) {
+        error = compile_err->message;
+        ch_free_compile_error(compile_err);
+        return nullptr;
+    }
+
+    return ue2::make_unique<HybridDB>(db, idsvec.begin(), idsvec.end());
+}
+#endif
+
+shared_ptr<BaseDB> UltimateTruth::compile(const set<unsigned> &ids,
                                                string &error) const {
     // Build our vectors for compilation
     const size_t count = ids.size();
@@ -811,6 +1010,17 @@ shared_ptr<HyperscanDB> UltimateTruth::compile(const set<unsigned> &ids,
             ext[n].edit_distance = edit_distance;
         }
 
+        if (colliderMode == MODE_HYBRID) {
+            if (ext[n].flags) {
+                error = "Hybrid does not support extended parameters.";
+                return nullptr;
+            }
+            // We can also strip some other flags in the hybrid matcher.
+            flags[n] &= ~HS_FLAG_PREFILTER; // prefilter always used
+            flags[n] &= ~HS_FLAG_ALLOWEMPTY; // empty always allowed
+            flags[n] &= ~HS_FLAG_SOM_LEFTMOST; // SOM always on
+        }
+
         n++;
     }
 
@@ -827,8 +1037,18 @@ shared_ptr<HyperscanDB> UltimateTruth::compile(const set<unsigned> &ids,
         idsvec.push_back(0);
     }
 
-    auto db = compileHyperscan(patterns, flags, idsvec, ext, m_mode, platform,
-                               error, grey);
+    unique_ptr<BaseDB> db;
+    if (colliderMode == MODE_HYBRID) {
+#ifdef HS_HYBRID
+        db = compileHybrid(patterns, flags, idsvec, m_mode, platform, error);
+#else
+        error = "Hybrid mode not available in this build.";
+#endif
+    } else {
+        db = compileHyperscan(patterns, flags, idsvec, ext, m_mode,
+                              platform, error, grey);
+    }
+
     if (!db) {
         return nullptr;
     }
@@ -850,18 +1070,29 @@ shared_ptr<HyperscanDB> UltimateTruth::compile(const set<unsigned> &ids,
     return move(db);
 }
 
-bool UltimateTruth::allocScratch(shared_ptr<const HyperscanDB> db) {
+bool UltimateTruth::allocScratch(shared_ptr<const BaseDB> db) {
     assert(db);
 
-    // We explicitly avoid running scratch allocators for the same HyperscanDB
+    // We explicitly avoid running scratch allocators for the same BaseDB
     // over and over again by retaining a shared_ptr to the last one we saw.
     if (db == last_db) {
         return true;
     }
 
-    hs_error_t err = hs_alloc_scratch(db.get()->db, &scratch);
-    if (err != HS_SUCCESS) {
-        return false;
+    if (colliderMode == MODE_HYBRID) {
+#ifdef HS_HYBRID
+        ch_error_t err = ch_alloc_scratch(
+            reinterpret_cast<const HybridDB *>(db.get())->db, &chimeraScratch);
+        if (err != HS_SUCCESS) {
+            return false;
+        }
+#endif // HS_HYBRID
+    } else {
+        hs_error_t err = hs_alloc_scratch(
+            reinterpret_cast<const HyperscanDB *>(db.get())->db, &scratch);
+        if (err != HS_SUCCESS) {
+            return false;
+        }
     }
 
     last_db = db;
@@ -869,20 +1100,40 @@ bool UltimateTruth::allocScratch(shared_ptr<const HyperscanDB> db) {
 }
 
 bool UltimateTruth::cloneScratch(void) {
-    hs_scratch_t *old_scratch = scratch;
-    hs_scratch_t *new_scratch;
-    hs_error_t ret = hs_clone_scratch(scratch, &new_scratch);
-    if (ret != HS_SUCCESS) {
-        DEBUG_PRINTF("failure to clone %d\n", ret);
-        return false;
+    if (colliderMode == MODE_HYBRID) {
+#ifdef HS_HYBRID
+        ch_scratch_t *old_scratch = chimeraScratch;
+        ch_scratch_t *new_scratch;
+        ch_error_t ret = ch_clone_scratch(chimeraScratch, &new_scratch);
+        if (ret != CH_SUCCESS) {
+            DEBUG_PRINTF("failure to clone %d\n", ret);
+            return false;
+        }
+        chimeraScratch = new_scratch;
+        ret = ch_free_scratch(old_scratch);
+        if (ret != CH_SUCCESS) {
+            DEBUG_PRINTF("failure to free %d\n", ret);
+            return false;
+        }
+        DEBUG_PRINTF("hybrid scratch cloned from %p to %p\n",
+                     old_scratch, chimeraScratch);
+#endif // HS_HYBRID
+    } else {
+        hs_scratch_t *old_scratch = scratch;
+        hs_scratch_t *new_scratch;
+        hs_error_t ret = hs_clone_scratch(scratch, &new_scratch);
+        if (ret != HS_SUCCESS) {
+            DEBUG_PRINTF("failure to clone %d\n", ret);
+            return false;
+        }
+        scratch = new_scratch;
+        ret = hs_free_scratch(old_scratch);
+        if (ret != HS_SUCCESS) {
+            DEBUG_PRINTF("failure to free %d\n", ret);
+            return false;
+        }
+        DEBUG_PRINTF("scratch cloned from %p to %p\n", old_scratch, scratch);
     }
-    scratch = new_scratch;
-    ret = hs_free_scratch(old_scratch);
-    if (ret != HS_SUCCESS) {
-        DEBUG_PRINTF("failure to free %d\n", ret);
-        return false;
-    }
-    DEBUG_PRINTF("scratch cloned from %p to %p\n", old_scratch, scratch);
     return true;
 }
 
@@ -947,20 +1198,35 @@ char *UltimateTruth::setupVecScanBuffer(const char *begin, size_t len,
     return ptr;
 }
 
-bool UltimateTruth::saveDatabase(const HyperscanDB &hdb,
+bool UltimateTruth::saveDatabase(const BaseDB &bdb,
                                  const string &filename) const {
-    return ::saveDatabase(hdb.db, filename.c_str(), g_verbose);
+    if (colliderMode == MODE_HYBRID) {
+        cerr << "Hybrid mode doesn't support serialization." << endl;
+        abort();
+    } else {
+        return ::saveDatabase(reinterpret_cast<const HyperscanDB *>(&bdb)->db,
+                              filename.c_str(), g_verbose);
+    }
+    return false;
 }
 
-shared_ptr<HyperscanDB>
+shared_ptr<BaseDB>
 UltimateTruth::loadDatabase(const string &filename,
                             const std::set<unsigned> &ids) const {
-    hs_database_t *hs_db = ::loadDatabase(filename.c_str(), g_verbose);
-    if (!hs_db) {
-        return nullptr;
+    shared_ptr<BaseDB> db;
+
+    if (colliderMode == MODE_HYBRID) {
+        cerr << "Hybrid mode doesn't support deserialization." << endl;
+        abort();
+    } else {
+        hs_database_t *hs_db = ::loadDatabase(filename.c_str(), g_verbose);
+        if (!hs_db) {
+            return nullptr;
+        }
+
+        db = make_shared<HyperscanDB>(hs_db, ids.begin(), ids.end());
     }
 
-    auto db = make_shared<HyperscanDB>(hs_db, ids.begin(), ids.end());
     assert(db);
 
     // Fill db::ordered with the expressions that require the ordered flag.

tools/hscollider/UltimateTruth.h

@@ -1,5 +1,5 @@
 /*
- * Copyright (c) 2015-2017, Intel Corporation
+ * 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:
@@ -33,6 +33,10 @@
 
 #include "hs.h"
 
+#ifdef HS_HYBRID
+#include "chimera/ch.h"
+#endif
+
 #include <memory>
 #include <ostream>
 #include <set>
@@ -47,7 +51,7 @@ struct Grey;
 
 } // namespace ue2
 
-class HyperscanDB;
+class BaseDB;
 class ResultSet;
 
 // Wrapper around ue2 to generate results for an expression and corpus.
@@ -59,13 +63,13 @@ public:
 
     ~UltimateTruth();
 
-    std::shared_ptr<HyperscanDB> compile(const std::set<unsigned> &ids,
+    std::shared_ptr<BaseDB> compile(const std::set<unsigned> &ids,
                                          std::string &error) const;
 
-    bool saveDatabase(const HyperscanDB &db,
+    bool saveDatabase(const BaseDB &db,
                       const std::string &filename) const;
 
-    std::shared_ptr<HyperscanDB>
+    std::shared_ptr<BaseDB>
     loadDatabase(const std::string &filename,
                  const std::set<unsigned> &ids) const;
 
@@ -74,7 +78,7 @@ public:
         return !m_xcompile;
     }
 
-    bool run(unsigned id, std::shared_ptr<const HyperscanDB> db,
+    bool run(unsigned id, std::shared_ptr<const BaseDB> db,
              const std::string &buffer, bool single_pattern, unsigned align,
              ResultSet &rs);
 
@@ -84,22 +88,28 @@ public:
     std::string dbFilename(const std::set<unsigned int> &ids) const;
 
 private:
-    bool blockScan(const HyperscanDB &db, const std::string &buffer,
+    bool blockScan(const BaseDB &db, const std::string &buffer,
                    size_t align, match_event_handler callback, void *ctx,
                    ResultSet *rs);
-    bool streamingScan(const HyperscanDB &db, const std::string &buffer,
+    bool streamingScan(const BaseDB &db, const std::string &buffer,
                        size_t align, match_event_handler callback, void *ctx,
                        ResultSet *rs);
-    bool vectoredScan(const HyperscanDB &db, const std::string &buffer,
+    bool vectoredScan(const BaseDB &db, const std::string &buffer,
                       size_t align, match_event_handler callback, void *ctx,
                       ResultSet *rs);
+#ifdef HS_HYBRID
+    bool hybridScan(const BaseDB &db, const std::string &buffer,
+                    size_t align, ch_match_event_handler callback,
+                    ch_error_event_handler error_callback,
+                    void *ctx, ResultSet *rs);
+#endif // HS_HYBRID
 
     char *setupScanBuffer(const char *buf, size_t len, size_t align);
 
     char *setupVecScanBuffer(const char *buf, size_t len, size_t align,
                              unsigned int block_id);
 
-    bool allocScratch(std::shared_ptr<const HyperscanDB> db);
+    bool allocScratch(std::shared_ptr<const BaseDB> db);
 
     bool cloneScratch(void);
 
@@ -126,6 +136,11 @@ private:
     // Scratch space for Hyperscan.
     hs_scratch_t *scratch;
 
+#ifdef HS_HYBRID
+    // Scratch space for Chimera.
+    ch_scratch_t *chimeraScratch;
+#endif // HS_HYBRID
+
     // Temporary scan buffer used for realigned scanning
     std::vector<char> m_scanBuf;
 
@@ -134,7 +149,7 @@ private:
 
     // Last database we successfully allocated scratch for, so that we can
     // avoid unnecessarily reallocating for it.
-    std::shared_ptr<const HyperscanDB> last_db;
+    std::shared_ptr<const BaseDB> last_db;
 
     const hs_platform_info *platform;
 };

tools/hscollider/args.cpp

@@ -76,6 +76,7 @@ void usage(const char *name, const char *error) {
            "blocks.\n");
     printf("  -V NUM          Use vectored mode, split data into ~NUM "
            "blocks.\n");
+    printf("  -H              Use hybrid mode.\n");
     printf("  -Z {R or 0-%d}  Only test one alignment, either as given or "
            "'R' for random.\n", MAX_MAX_UE2_ALIGN - 1);
     printf("  -q              Quiet; display only match differences, no other "
@@ -90,6 +91,7 @@ void usage(const char *name, const char *error) {
     printf("  -E DISTANCE     Match all patterns within edit distance"
            " DISTANCE.\n");
     printf("  --prefilter     Apply HS_FLAG_PREFILTER to all patterns.\n");
+    printf("  --no-groups     Disable capturing in Hybrid mode.\n");
     printf("\n");
     printf("Testing mode options:\n");
     printf("\n");
@@ -157,7 +159,7 @@ void processArgs(int argc, char *argv[], CorpusProperties &corpus_gen_prop,
                  vector<string> *corpora, UNUSED Grey *grey,
                  unique_ptr<hs_platform_info> *plat_out) {
     static const char options[]
-        = "-ab:cC:d:D:e:E:G:hi:k:Lm:M:n:o:O:p:P:qr:R:S:s:t:T:vV:w:x:X:Y:z:Z:8";
+        = "-ab:cC:d:D:e:E:G:hHi:k:Lm:M:n:o:O:p:P:qr:R:S:s:t:T:vV:w:x:X:Y:z:Z:8";
     s32 in_multi = 0;
     s32 in_corpora = 0;
     int pcreFlag = 1;
@@ -180,6 +182,7 @@ void processArgs(int argc, char *argv[], CorpusProperties &corpus_gen_prop,
         {"no-signal-handler", 0, &no_signal_handler, 1},
         {"compress-expand", 0, &compressFlag, 1},
         {"compress-reset-expand", 0, &compressResetFlag, 1},
+        {"no-groups", 0, &no_groups, 1},
         {nullptr, 0, nullptr, 0}};
 
     for (;;) {
@@ -271,6 +274,15 @@ void processArgs(int argc, char *argv[], CorpusProperties &corpus_gen_prop,
             case 'h':
                 usage(argv[0], nullptr);
                 exit(0);
+            case 'H':
+                if (colliderMode != MODE_BLOCK) {
+                    usage(argv[0], "You can only use one mode at a time!");
+                    exit(1);
+                }
+                colliderMode = MODE_HYBRID;
+                // Disable graph truth in hybrid mode
+                nfaFlag = 0;
+                break;
             case 'i':
                 loadDatabases = true;
                 serializePath = optarg;
@@ -542,6 +554,11 @@ void processArgs(int argc, char *argv[], CorpusProperties &corpus_gen_prop,
         exit(1);
     }
 
+    if (colliderMode == MODE_HYBRID && !ue2Flag) {
+        usage(argv[0], "You cannot disable UE2 engine in Hybrid mode.");
+        exit(1);
+    }
+
     // need at least two pattern engines active
     if (nfaFlag + pcreFlag + ue2Flag < 2) {
         usage(argv[0], "At least two pattern engines should be active.");

tools/hscollider/common.h

@@ -1,5 +1,5 @@
 /*
- * Copyright (c) 2015-2017, Intel Corporation
+ * 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:
@@ -36,7 +36,8 @@
 enum ColliderMode {
     MODE_BLOCK,
     MODE_STREAMING,
-    MODE_VECTORED
+    MODE_VECTORED,
+    MODE_HYBRID
 };
 
 extern unsigned numThreads;
@@ -68,6 +69,7 @@ extern unsigned max_ue2_align;
 extern size_t g_memoryLimit;
 extern bool force_utf8;
 extern int force_prefilter;
+extern int no_groups;
 extern unsigned somPrecisionMode;
 extern unsigned limit_matches;
 extern unsigned randomSeed;

tools/hscollider/main.cpp

@@ -1,5 +1,5 @@
 /*
- * Copyright (c) 2015-2017, Intel Corporation
+ * 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:
@@ -448,6 +448,9 @@ void printMode(void) {
         case MODE_VECTORED:
             cout << "Vectored-" << g_streamBlocks;
             break;
+        case MODE_HYBRID:
+            cout << "Hybrid";
+            break;
     }
 
     if (use_copy_scratch) {
@@ -690,7 +693,7 @@ shared_ptr<DatabaseProxy> constructDatabase(const set<unsigned int> &ids,
 
     if (loadDatabases) {
         string filename = ultimate.dbFilename(ids);
-        shared_ptr<HyperscanDB> db = ultimate.loadDatabase(filename, ids);
+        shared_ptr<BaseDB> db = ultimate.loadDatabase(filename, ids);
         if (!db) {
             if (!g_quiet) {
                 cout << "FAILED: could not load database " << filename << endl;
@@ -706,7 +709,7 @@ shared_ptr<DatabaseProxy> constructDatabase(const set<unsigned int> &ids,
         // If we're not runnable (i.e. we're cross-compiling), let's at least
         // try to build the database.
         if (!ultimate.runnable()) {
-            shared_ptr<HyperscanDB> db = ue2->get(ultimate);
+            shared_ptr<BaseDB> db = ue2->get(ultimate);
             assert(db); // throws otherwise
         }
 
@@ -872,7 +875,7 @@ void runTestUnit(ostream &out, GroundTruth &ground, GraphTruth &graph,
     assert(use_UE2);
     Corpus &corpus = unit.corpus;
 
-    shared_ptr<const HyperscanDB> db;
+    shared_ptr<const BaseDB> db;
     if (use_UE2) {
         // Acquire UE2 database.
         debug_stage = STAGE_UE2_COMPILE;
@@ -1648,6 +1651,7 @@ void printSettingsV(const vector<string> &corporaFiles,
         case MODE_BLOCK:        cout << "block mode"; break;
         case MODE_STREAMING:    cout << "streaming mode"; break;
         case MODE_VECTORED:     cout << "vectored mode"; break;
+        case MODE_HYBRID:       cout << "hybrid mode"; break;
     }
     cout << endl;
 
@@ -1746,6 +1750,7 @@ void printSettingsQ(const vector<string> &corporaFiles,
         case MODE_BLOCK:        cout << "block mode"; break;
         case MODE_STREAMING:    cout << "streaming mode"; break;
         case MODE_VECTORED:     cout << "vectored mode"; break;
+        case MODE_HYBRID:       cout << "hybrid mode"; break;
     }
     cout << endl;
 

unit/CMakeLists.txt

@@ -123,22 +123,58 @@ set_target_properties(unit-internal PROPERTIES COMPILE_FLAGS "${HS_CXX_FLAGS}")
 target_link_libraries(unit-internal hs corpusomatic)
 endif(NOT (RELEASE_BUILD OR FAT_RUNTIME))
 
-#
-# build target to run unit tests
-#
-if (NOT RELEASE_BUILD)
-add_custom_target(
-    unit
-    COMMAND bin/unit-internal
-    COMMAND bin/unit-hyperscan
-    WORKING_DIRECTORY ${CMAKE_BINARY_DIR}
-    DEPENDS unit-internal unit-hyperscan
-)
-else ()
-add_custom_target(
-    unit
-    COMMAND bin/unit-hyperscan
-    WORKING_DIRECTORY ${CMAKE_BINARY_DIR}
-    DEPENDS unit-hyperscan
-)
+if (BUILD_CHIMERA)
+    # enable Chimera unit tests
+    set(unit_chimera_SOURCES
+        ${gtest_SOURCES}
+        chimera/allocators.cpp
+        chimera/arg_checks.cpp
+        chimera/bad_patterns.cpp
+        chimera/compat.cpp
+        chimera/main.cpp
+        chimera/scan.cpp
+        )
+    add_executable(unit-chimera ${unit_chimera_SOURCES})
+    target_link_libraries(unit-chimera chimera hs pcre)
+    #
+    # build target to run unit tests
+    #
+    if (NOT RELEASE_BUILD)
+    add_custom_target(
+        unit
+        COMMAND bin/unit-internal
+        COMMAND bin/unit-hyperscan
+        COMMAND bin/unit-chimera
+        WORKING_DIRECTORY ${CMAKE_BINARY_DIR}
+        DEPENDS unit-internal unit-hyperscan unit-chimera
+    )
+    else ()
+    add_custom_target(
+        unit
+        COMMAND bin/unit-hyperscan
+        COMMAND bin/unit-chimera
+        WORKING_DIRECTORY ${CMAKE_BINARY_DIR}
+        DEPENDS unit-hyperscan unit-chimera
+    )
+    endif()
+else()
+    #
+    # build target to run unit tests
+    #
+    if (NOT RELEASE_BUILD)
+    add_custom_target(
+        unit
+        COMMAND bin/unit-internal
+        COMMAND bin/unit-hyperscan
+        WORKING_DIRECTORY ${CMAKE_BINARY_DIR}
+        DEPENDS unit-internal unit-hyperscan
+    )
+    else ()
+    add_custom_target(
+        unit
+        COMMAND bin/unit-hyperscan
+        WORKING_DIRECTORY ${CMAKE_BINARY_DIR}
+        DEPENDS unit-hyperscan
+    )
+    endif()
 endif()

unit/chimera/allocators.cpp

@@ -0,0 +1,149 @@
+/*
+ * Copyright (c) 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 "config.h"
+
+#include "gtest/gtest.h"
+#include "chimera/ch.h"
+
+#include <cstdlib>
+#include <string>
+
+using std::string;
+
+static void *null_malloc(size_t) { return nullptr; }
+
+// Helper: correctly construct a simple database.
+static
+void makeDatabase(ch_database_t **hydb) {
+    static const char *expr[] = { "foobar" };
+    ch_database_t *db = nullptr;
+    ch_compile_error_t *compile_err = nullptr;
+    ch_error_t err;
+
+    err = ch_compile_multi(expr, nullptr, nullptr, 1, 0, nullptr, &db,
+                           &compile_err);
+
+    ASSERT_EQ(CH_SUCCESS, err);
+    ASSERT_TRUE(db != nullptr);
+
+    *hydb = db;
+}
+
+TEST(HybridAllocator, DatabaseInfoBadAlloc) {
+    ch_database_t *db = nullptr;
+    makeDatabase(&db);
+    ASSERT_TRUE(db != nullptr);
+
+    ch_set_allocator(null_malloc, nullptr);
+
+    char *info = nullptr;
+    ch_error_t err = ch_database_info(db, &info);
+    ASSERT_EQ(CH_NOMEM, err);
+
+    ch_set_allocator(nullptr, nullptr);
+    ch_free_database(db);
+}
+
+static
+void * two_aligned_malloc(size_t len) {
+    void *mem = malloc(len + 2);
+    if (!mem) {
+        return nullptr;
+    }
+    return (char *)mem + 2;
+}
+
+static
+void two_aligned_free(void *mem) {
+    if (!mem) {
+        return;
+    }
+    // Allocated with two_aligned_malloc above.
+    free((char *)mem - 2);
+}
+
+TEST(HybridAllocator, TwoAlignedCompile) {
+    ch_set_database_allocator(two_aligned_malloc, two_aligned_free);
+
+    ch_database_t *db = nullptr;
+    ch_compile_error_t *compile_err = nullptr;
+    const hs_platform_info_t *platform = nullptr;
+    ch_error_t err =
+        ch_compile("foobar", 0, CH_MODE_GROUPS, platform, &db, &compile_err);
+    ASSERT_EQ(CH_COMPILER_ERROR, err);
+    ASSERT_EQ(nullptr, db);
+    ASSERT_NE(nullptr, compile_err);
+    ch_free_compile_error(compile_err);
+    ch_set_database_allocator(nullptr, nullptr);
+}
+
+TEST(HybridAllocator, TwoAlignedCompileError) {
+    ch_set_misc_allocator(two_aligned_malloc, two_aligned_free);
+
+    ch_database_t *db = nullptr;
+    ch_compile_error_t *compile_err = nullptr;
+    const hs_platform_info_t *platform = nullptr;
+    ch_error_t err =
+        ch_compile("\\1", 0, CH_MODE_GROUPS, platform, &db, &compile_err);
+    ASSERT_EQ(CH_COMPILER_ERROR, err);
+    ASSERT_EQ(nullptr, db);
+    ASSERT_NE(nullptr, compile_err);
+    EXPECT_STREQ("Allocator returned misaligned memory.", compile_err->message);
+    ch_free_compile_error(compile_err);
+    ch_set_database_allocator(nullptr, nullptr);
+    ch_set_misc_allocator(nullptr, nullptr);
+}
+
+TEST(HybridAllocator, TwoAlignedDatabaseInfo) {
+    ch_database_t *db = nullptr;
+    makeDatabase(&db);
+
+    ch_set_misc_allocator(two_aligned_malloc, two_aligned_free);
+
+    char *info = nullptr;
+    ch_error_t err = ch_database_info(db, &info);
+    ASSERT_EQ(CH_BAD_ALLOC, err);
+
+    ch_set_misc_allocator(nullptr, nullptr);
+    ch_free_database(db);
+}
+
+TEST(HybridAllocator, TwoAlignedAllocScratch) {
+    ch_database_t *db = nullptr;
+    makeDatabase(&db);
+
+    ch_set_scratch_allocator(two_aligned_malloc, two_aligned_free);
+
+    ch_scratch_t *scratch = nullptr;
+    ch_error_t err = ch_alloc_scratch(db, &scratch);
+    ASSERT_EQ(CH_BAD_ALLOC, err);
+
+    ch_set_scratch_allocator(nullptr, nullptr);
+    ch_free_database(db);
+}

unit/chimera/arg_checks.cpp

@@ -0,0 +1,591 @@
+/*
+ * Copyright (c) 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 "gtest/gtest.h"
+#include "chimera/ch.h"
+
+static char garbage[] = "TEST(HybridArgChecks, DatabaseSizeNoDatabase) {" \
+                        "    size_t sz = ch_database_size(0);" \
+                        "    ASSERT_EQ(0, sz);";
+
+namespace /* anonymous */ {
+
+// Dummy callback: does nothing, returns 0 (keep matching)
+ch_callback_t dummyHandler(unsigned, unsigned long long,
+                           unsigned long long, unsigned, unsigned,
+                           const ch_capture_t *, void *) {
+    // empty
+    return CH_CALLBACK_CONTINUE;
+}
+
+// Helper: correctly construct a simple database.
+static
+void makeDatabase(ch_database_t **hydb) {
+    static const char *expr[] = { "foo.*bar" };
+    ch_database_t *db = nullptr;
+    ch_compile_error_t *compile_err = nullptr;
+    ch_error_t err;
+
+    err = ch_compile_multi(expr, nullptr, nullptr, 1, 0, nullptr, &db,
+                           &compile_err);
+
+    ASSERT_EQ(CH_SUCCESS, err);
+    ASSERT_TRUE(db != nullptr);
+
+    *hydb = db;
+}
+
+// Helper: given a database, build me some scratch.
+static
+void makeScratch(const ch_database_t *db,
+                 ch_scratch_t **scratch) {
+    ch_error_t err = ch_alloc_scratch(db, scratch);
+    ASSERT_EQ(CH_SUCCESS, err);
+    ASSERT_TRUE(*scratch != nullptr);
+}
+
+// Break the magic number of the given database.
+void breakDatabaseMagic(ch_database *db) {
+    // database magic should be 0xdbdb at the start
+    ASSERT_TRUE(memcmp("\xde\xde", db, 2) == 0);
+    *(char *)db = 0xdc;
+}
+
+// Break the version number of the given database.
+void breakDatabaseVersion(ch_database *db) {
+    // database version is the second u32
+    *((char *)db + 4) += 1;
+}
+
+// Check that CH_version gives us a reasonable string back
+TEST(HybridArgChecks, Version) {
+    const char *version = ch_version();
+    ASSERT_TRUE(version != nullptr);
+    ASSERT_TRUE(version[0] >= '0' && version[0] <= '9')
+        << "First byte should be a digit.";
+    ASSERT_EQ('.', version[1]) << "Second byte should be a dot.";
+}
+
+// ch_compile: Hand the compiler a bogus flag.
+TEST(HybridArgChecks, SingleBogusFlags) {
+    ch_database_t *db = nullptr;
+    ch_compile_error_t *compile_err = nullptr;
+    ch_error_t err;
+
+    static const unsigned int badflags[] = {
+        0xffffffff,
+        16,
+        128,
+        256,
+        512,
+    };
+
+    for (size_t i = 0; i < sizeof(badflags)/sizeof(badflags[0]); i++) {
+        const char expr[]  = "foobar";
+        err = ch_compile(expr, badflags[i], 0, nullptr, &db, &compile_err);
+        EXPECT_EQ(CH_COMPILER_ERROR, err);
+        EXPECT_TRUE(db == nullptr);
+        EXPECT_TRUE(compile_err != nullptr);
+        EXPECT_STREQ("Unrecognized flag used.", compile_err->message);
+        ch_free_compile_error(compile_err);
+    }
+}
+
+// ch_compile: Hand the compiler a bogus mode.
+TEST(HybridArgChecks, SingleBogusMode) {
+    ch_database_t *db = nullptr;
+    ch_compile_error_t *compile_err = nullptr;
+    ch_error_t err;
+
+    static const unsigned int badModes[] = {
+        0xffffffff,
+        1,
+        2,
+        CH_MODE_GROUPS << 1, // this was our largest mode flag
+    };
+
+    for (size_t i = 0; i < sizeof(badModes)/sizeof(badModes[0]); i++) {
+        const char expr[]  = "foobar";
+        err = ch_compile(expr, 0,  badModes[i], nullptr, &db, &compile_err);
+        EXPECT_EQ(CH_COMPILER_ERROR, err);
+        EXPECT_TRUE(db == nullptr);
+        EXPECT_TRUE(compile_err != nullptr);
+        EXPECT_STREQ("Invalid mode flag supplied.", compile_err->message);
+        ch_free_compile_error(compile_err);
+    }
+}
+
+// ch_compile: Compile a nullptr pattern set)
+TEST(HybridArgChecks, SingleCompileBlockNoPattern) {
+    ch_database_t *db = nullptr;
+    ch_compile_error_t *compile_err = nullptr;
+    ch_error_t err;
+    err = ch_compile(nullptr, 0, 0, nullptr, &db, &compile_err);
+    EXPECT_EQ(CH_COMPILER_ERROR, err);
+    EXPECT_TRUE(db == nullptr);
+    EXPECT_TRUE(compile_err != nullptr);
+    ch_free_compile_error(compile_err);
+}
+
+// ch_compile: Compile a pattern to a nullptr database ptr
+TEST(HybridArgChecks, SingleCompileBlockNoDatabase) {
+    ch_compile_error_t *compile_err = nullptr;
+    const char expr[] = "foobar";
+    ch_error_t err;
+    err = ch_compile(expr, 0, 0, nullptr, nullptr, &compile_err);
+    EXPECT_EQ(CH_COMPILER_ERROR, err);
+    EXPECT_TRUE(compile_err != nullptr);
+    ch_free_compile_error(compile_err);
+}
+
+// ch_compile_multi: Hand the compiler a bogus flag.
+TEST(HybridArgChecks, MultiBogusFlags) {
+    ch_database_t *db = nullptr;
+    ch_compile_error_t *compile_err = nullptr;
+    ch_error_t err;
+
+    static const unsigned int badflags[] = {
+        0xffffffff,
+        16, // HS_FLAG_ERROREOD
+        128,
+        256,
+        512,
+    };
+
+    for (size_t i = 0; i < sizeof(badflags)/sizeof(badflags[0]); i++) {
+        const char *expr[]  = { "foobar" };
+        err = ch_compile_multi(expr, &badflags[i], nullptr, 1, 0, nullptr, &db,
+                               &compile_err);
+        EXPECT_EQ(CH_COMPILER_ERROR, err);
+        EXPECT_TRUE(db == nullptr);
+        EXPECT_TRUE(compile_err != nullptr);
+        EXPECT_STREQ("Unrecognized flag used.", compile_err->message);
+        ch_free_compile_error(compile_err);
+    }
+}
+
+// ch_compile_multi: Hand the ch_compile_multi a bogus mode.
+TEST(HybridArgChecks, MultiBogusMode) {
+    ch_database_t *db = nullptr;
+    ch_compile_error_t *compile_err = nullptr;
+    ch_error_t err;
+
+    static const unsigned int badModes[] = {
+        0xffffffff,
+        1,
+        2,
+        CH_MODE_GROUPS << 1, // this was our largest mode flag
+    };
+
+    for (size_t i = 0; i < sizeof(badModes)/sizeof(badModes[0]); i++) {
+        const char *expr[]  = { "foobar" };
+        err = ch_compile_multi(expr, nullptr, nullptr, 1, badModes[i], nullptr,
+                               &db, &compile_err);
+        EXPECT_EQ(CH_COMPILER_ERROR, err);
+        EXPECT_TRUE(db == nullptr);
+        EXPECT_TRUE(compile_err != nullptr);
+        EXPECT_STREQ("Invalid mode flag supplied.", compile_err->message);
+        ch_free_compile_error(compile_err);
+    }
+}
+
+// ch_compile_multi: Compile a nullptr pattern set (block mode)
+TEST(HybridArgChecks, MultiCompileBlockNoPattern) {
+    ch_database_t *db = nullptr;
+    ch_compile_error_t *compile_err = nullptr;
+    ch_error_t err;
+    err = ch_compile_multi(nullptr, nullptr, nullptr, 1, 0, nullptr, &db,
+                           &compile_err);
+    EXPECT_EQ(CH_COMPILER_ERROR, err);
+    EXPECT_TRUE(db == nullptr);
+    EXPECT_TRUE(compile_err != nullptr);
+    ch_free_compile_error(compile_err);
+}
+
+// ch_compile_multi: Compile a set of zero patterns
+TEST(HybridArgChecks, MultiCompileZeroPatterns) {
+    ch_database_t *db = nullptr;
+    ch_compile_error_t *compile_err = nullptr;
+    const char *expr[] = {"foobar"};
+    ch_error_t err;
+    err = ch_compile_multi(expr, nullptr, nullptr, 0, 0, nullptr, &db,
+                           &compile_err);
+    EXPECT_EQ(CH_COMPILER_ERROR, err);
+    EXPECT_TRUE(db == nullptr);
+    EXPECT_TRUE(compile_err != nullptr);
+    ch_free_compile_error(compile_err);
+}
+
+// ch_compile_multi: Compile a pattern to a nullptr database ptr
+TEST(HybridArgChecks, MultiCompileBlockNoDatabase) {
+    ch_compile_error_t *compile_err = nullptr;
+    const char *expr[] = {"foobar"};
+    ch_error_t err;
+    err = ch_compile_multi(expr, nullptr, nullptr, 1, 0, nullptr, nullptr,
+                           &compile_err);
+    EXPECT_EQ(CH_COMPILER_ERROR, err);
+    EXPECT_TRUE(compile_err != nullptr);
+    ch_free_compile_error(compile_err);
+}
+
+// ch_compile_ext_multi: Hand the compiler a bogus flag.
+TEST(HybridArgChecks, ExtMultiBogusFlags) {
+    ch_database_t *db = nullptr;
+    ch_compile_error_t *compile_err = nullptr;
+    ch_error_t err;
+
+    static const unsigned int badflags[] = {
+        0xffffffff,
+        16, // HS_FLAG_ERROREOD
+        128,
+        256,
+        512,
+    };
+
+    for (size_t i = 0; i < sizeof(badflags)/sizeof(badflags[0]); i++) {
+        const char *expr[]  = { "foobar" };
+        err = ch_compile_ext_multi(expr, &badflags[i], nullptr, 1, 0,
+                                   10000000, 8000, nullptr, &db, &compile_err);
+        EXPECT_EQ(CH_COMPILER_ERROR, err);
+        EXPECT_TRUE(db == nullptr);
+        EXPECT_TRUE(compile_err != nullptr);
+        EXPECT_STREQ("Unrecognized flag used.", compile_err->message);
+        ch_free_compile_error(compile_err);
+    }
+}
+
+// ch_compile_ext_multi: Hand the ch_compile_multi a bogus mode.
+TEST(HybridArgChecks, ExtMultiBogusMode) {
+    ch_database_t *db = nullptr;
+    ch_compile_error_t *compile_err = nullptr;
+    ch_error_t err;
+
+    static const unsigned int badModes[] = {
+        0xffffffff,
+        1,
+        2,
+        CH_MODE_GROUPS << 1, // this was our largest mode flag
+    };
+
+    for (size_t i = 0; i < sizeof(badModes)/sizeof(badModes[0]); i++) {
+        const char *expr[]  = { "foobar" };
+        err = ch_compile_ext_multi(expr, nullptr, nullptr, 1, badModes[i],
+                                   10000000, 8000, nullptr, &db, &compile_err);
+        EXPECT_EQ(CH_COMPILER_ERROR, err);
+        EXPECT_TRUE(db == nullptr);
+        EXPECT_TRUE(compile_err != nullptr);
+        EXPECT_STREQ("Invalid mode flag supplied.", compile_err->message);
+        ch_free_compile_error(compile_err);
+    }
+}
+
+// ch_compile_ext_multi: Compile a nullptr pattern set (block mode)
+TEST(HybridArgChecks, ExtMultiCompileBlockNoPattern) {
+    ch_database_t *db = nullptr;
+    ch_compile_error_t *compile_err = nullptr;
+    ch_error_t err;
+    err = ch_compile_ext_multi(nullptr, nullptr, nullptr, 1, 0, 10000000,
+                               8000, nullptr, &db, &compile_err);
+    EXPECT_EQ(CH_COMPILER_ERROR, err);
+    EXPECT_TRUE(db == nullptr);
+    EXPECT_TRUE(compile_err != nullptr);
+    ch_free_compile_error(compile_err);
+}
+
+// ch_compile_ext_multi: Compile a set of zero patterns
+TEST(HybridArgChecks, ExtMultiCompileZeroPatterns) {
+    ch_database_t *db = nullptr;
+    ch_compile_error_t *compile_err = nullptr;
+    const char *expr[] = {"foobar"};
+    ch_error_t err;
+    err = ch_compile_ext_multi(expr, nullptr, nullptr, 0, 0, 10000000,
+                               8000, nullptr, &db, &compile_err);
+    EXPECT_EQ(CH_COMPILER_ERROR, err);
+    EXPECT_TRUE(db == nullptr);
+    EXPECT_TRUE(compile_err != nullptr);
+    ch_free_compile_error(compile_err);
+}
+
+// ch_compile_ext_multi: Compile a pattern to a nullptr database ptr
+TEST(HybridArgChecks, ExtMultiCompileBlockNoDatabase) {
+    ch_compile_error_t *compile_err = nullptr;
+    const char *expr[] = {"foobar"};
+    ch_error_t err;
+    err = ch_compile_ext_multi(expr, nullptr, nullptr, 1, 0, 10000000,
+                           8000, nullptr, nullptr, &compile_err);
+    EXPECT_EQ(CH_COMPILER_ERROR, err);
+    EXPECT_TRUE(compile_err != nullptr);
+    ch_free_compile_error(compile_err);
+}
+
+// ch_scan: Call with no database
+TEST(HybridArgChecks, ScanBlockNoDatabase) {
+    ch_database_t *db = nullptr;
+    makeDatabase(&db);
+    ch_scratch_t *scratch = nullptr;
+    makeScratch(db, &scratch);
+
+    ch_error_t err = ch_scan(nullptr, "data", 4, 0, scratch,
+                             dummyHandler, nullptr, nullptr);
+    ASSERT_NE(CH_SUCCESS, err);
+    EXPECT_NE(CH_SCAN_TERMINATED, err);
+
+    // teardown
+    err = ch_free_scratch(scratch);
+    ASSERT_EQ(CH_SUCCESS, err);
+    ch_free_database(db);
+}
+
+// ch_scan: Call with a database with broken magic
+TEST(HybridArgChecks, ScanBlockBrokenDatabaseMagic) {
+    ch_database_t *db = nullptr;
+    makeDatabase(&db);
+    ch_scratch_t *scratch = nullptr;
+    makeScratch(db, &scratch);
+
+    // break the database here, after scratch alloc
+    breakDatabaseMagic(db);
+
+    ch_error_t err = ch_scan(db, "data", 4, 0, scratch,
+                             dummyHandler, nullptr, nullptr);
+    ASSERT_EQ(CH_INVALID, err);
+
+    // teardown
+    err = ch_free_scratch(scratch);
+    ASSERT_EQ(CH_SUCCESS, err);
+    free(db);
+}
+
+// ch_scan: Call with a database with broken version
+TEST(HybridArgChecks, ScanBlockBrokenDatabaseVersion) {
+    ch_database_t *db = nullptr;
+    makeDatabase(&db);
+    ch_scratch_t *scratch = nullptr;
+    makeScratch(db, &scratch);
+
+    // break the database here, after scratch alloc
+    breakDatabaseVersion(db);
+
+    ch_error_t err = ch_scan(db, "data", 4, 0, scratch,
+                             dummyHandler, nullptr, nullptr);
+    ASSERT_EQ(CH_DB_VERSION_ERROR, err);
+
+    // teardown
+    err = ch_free_scratch(scratch);
+    ASSERT_EQ(CH_SUCCESS, err);
+    ch_free_database(db);
+}
+
+// ch_scan: Call with no data
+TEST(HybridArgChecks, ScanBlockNoData) {
+    ch_database_t *db = nullptr;
+    makeDatabase(&db);
+    ch_scratch_t *scratch = nullptr;
+    makeScratch(db, &scratch);
+
+    ch_error_t err = ch_scan(db, nullptr, 4, 0, scratch, dummyHandler,
+                             nullptr, nullptr);
+    ASSERT_NE(CH_SUCCESS, err);
+    EXPECT_NE(CH_SCAN_TERMINATED, err);
+
+    // teardown
+    err = ch_free_scratch(scratch);
+    ASSERT_EQ(CH_SUCCESS, err);
+    ch_free_database(db);
+}
+
+// ch_scan: Call with no scratch
+TEST(HybridArgChecks, ScanBlockNoScratch) {
+    ch_database_t *db = nullptr;
+    makeDatabase(&db);
+
+    ch_error_t err = ch_scan(db, "data", 4, 0, nullptr, dummyHandler,
+                             nullptr, nullptr);
+    ASSERT_NE(CH_SUCCESS, err);
+    EXPECT_NE(CH_SCAN_TERMINATED, err);
+
+    // teardown
+    ch_free_database(db);
+}
+
+// ch_scan: Call with no event handler
+TEST(HybridArgChecks, ScanBlockNoHandler) {
+    ch_database_t *db = nullptr;
+    makeDatabase(&db);
+    ch_scratch_t *scratch = nullptr;
+    makeScratch(db, &scratch);
+
+    ch_error_t err = ch_scan(db, "data", 4, 0, scratch, nullptr, nullptr,
+                             nullptr);
+    ASSERT_EQ(CH_SUCCESS, err);
+    EXPECT_NE(CH_SCAN_TERMINATED, err);
+
+    // teardown
+    err = ch_free_scratch(scratch);
+    ASSERT_EQ(CH_SUCCESS, err);
+    ch_free_database(db);
+}
+
+// ch_alloc_scratch: Call with no database
+TEST(HybridArgChecks, AllocScratchNoDatabase) {
+    ch_scratch_t *scratch = nullptr;
+    ch_error_t err = ch_alloc_scratch(nullptr, &scratch);
+    EXPECT_NE(CH_SUCCESS, err);
+    EXPECT_TRUE(scratch == nullptr);
+}
+
+// ch_alloc_scratch: Call with nullptr ptr-to-scratch
+TEST(HybridArgChecks, AllocScratchNullScratchPtr) {
+    ch_database_t *db = nullptr;
+    makeDatabase(&db);
+
+    ch_error_t err = ch_alloc_scratch(db, nullptr);
+    ASSERT_EQ(CH_INVALID, err);
+
+    // teardown
+    ch_free_database(db);
+}
+
+// ch_alloc_scratch: Call with bogus scratch
+TEST(HybridArgChecks, AllocScratchBogusScratch) {
+    ch_database_t *db = nullptr;
+    makeDatabase(&db);
+
+    ch_scratch_t *blah = (ch_scratch_t *)malloc(100);
+    memset(blah, 0xf0, 100);
+    ch_error_t err = ch_alloc_scratch(db, &blah);
+    ASSERT_EQ(CH_INVALID, err);
+
+    // teardown
+    free(blah);
+    ch_free_database(db);
+}
+
+// ch_alloc_scratch: Call with broken database magic
+TEST(HybridArgChecks, AllocScratchBadDatabaseMagic) {
+    ch_database_t *db = nullptr;
+    makeDatabase(&db);
+
+    breakDatabaseMagic(db);
+
+    ch_scratch_t *scratch = nullptr;
+    ch_error_t err = ch_alloc_scratch(db, &scratch);
+    ASSERT_EQ(CH_INVALID, err);
+
+    // teardown
+    free(db);
+}
+
+// ch_alloc_scratch: Call with broken database version
+TEST(HybridArgChecks, AllocScratchBadDatabaseVersion) {
+    ch_database_t *db = nullptr;
+    makeDatabase(&db);
+
+    breakDatabaseVersion(db);
+
+    ch_scratch_t *scratch = nullptr;
+    ch_error_t err = ch_alloc_scratch(db, &scratch);
+    ASSERT_EQ(CH_DB_VERSION_ERROR, err);
+
+    // teardown
+    ch_free_database(db);
+}
+
+// ch_clone_scratch: Call with no source scratch
+TEST(HybridArgChecks, CloneScratchNoSource) {
+    ch_scratch_t *scratch = nullptr, *scratch2 = nullptr;
+    ch_error_t err = ch_clone_scratch(scratch, &scratch2);
+    EXPECT_NE(CH_SUCCESS, err);
+    EXPECT_TRUE(scratch2 == nullptr);
+}
+
+// ch_database_size: Call with no database
+TEST(HybridArgChecks, DatabaseSizeNoDatabase) {
+    size_t sz = 0;
+    ch_error_t err = ch_database_size(0, &sz);
+    ASSERT_EQ(CH_INVALID, err);
+    ASSERT_EQ(0U, sz);
+}
+
+// ch_clone_scratch: bad scratch arg
+TEST(HybridArgChecks, CloneBadScratch) {
+    // Try cloning the scratch
+    void *local_garbage = malloc(sizeof(garbage));
+    memcpy(local_garbage, garbage, sizeof(garbage));
+    ch_scratch_t *cloned = nullptr;
+    ch_scratch_t *scratch = (ch_scratch_t *)local_garbage;
+    ch_error_t err = ch_clone_scratch(scratch, &cloned);
+    free(local_garbage);
+    ASSERT_EQ(CH_INVALID, err);
+}
+
+// ch_scan: bad scratch arg
+TEST(HybridArgChecks, ScanBadScratch) {
+    ch_database_t *db = nullptr;
+    makeDatabase(&db);
+
+    void *local_garbage = malloc(sizeof(garbage));
+    memcpy(local_garbage, garbage, sizeof(garbage));
+
+    ch_scratch_t *scratch = (ch_scratch_t *)local_garbage;
+    ch_error_t err = ch_scan(db, "data", 4, 0, scratch,
+                             dummyHandler, nullptr, nullptr);
+    free(local_garbage);
+    ASSERT_EQ(CH_INVALID, err);
+
+    // teardown
+    ch_free_database(db);
+}
+
+TEST(HybridArgChecks, ch_free_database_null) {
+    ch_error_t err = ch_free_database(nullptr);
+    ASSERT_EQ(CH_SUCCESS, err);
+}
+
+TEST(HybridArgChecks, ch_free_database_garbage) {
+    ch_error_t err = ch_free_database((ch_database_t *)garbage);
+    ASSERT_EQ(CH_INVALID, err);
+}
+
+TEST(HybridArgChecks, ch_free_scratch_null) {
+    ch_error_t err = ch_free_scratch(nullptr);
+    ASSERT_EQ(CH_SUCCESS, err);
+}
+
+TEST(HybridArgChecks, ch_free_scratch_garbage) {
+    ch_error_t err = ch_free_scratch((ch_scratch_t *)garbage);
+    ASSERT_EQ(CH_INVALID, err);
+}
+
+TEST(HybridArgChecks, ch_free_compile_error_null) {
+    ch_error_t err = ch_free_compile_error(nullptr);
+    ASSERT_EQ(CH_SUCCESS, err);
+}
+
+} // namespace
+

unit/chimera/bad_patterns.cpp

@@ -0,0 +1,95 @@
+/*
+ * Copyright (c) 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 "gtest/gtest.h"
+#include "chimera/ch.h"
+
+using namespace testing;
+
+class HybridCompile : public TestWithParam<const char *> {
+    // empty
+};
+
+TEST_P(HybridCompile, BadPattern) {
+    ch_error_t err;
+    ch_compile_error_t *compile_err = nullptr;
+    const char *pattern = GetParam();
+    ch_database_t *db = nullptr;
+
+    err = ch_compile_multi(&pattern, nullptr, nullptr, 1, 0, nullptr, &db,
+                           &compile_err);
+    ASSERT_NE(CH_SUCCESS, err) << "Compile should have failed for expr: "
+        << pattern;
+    ASSERT_TRUE(db == nullptr);
+    ASSERT_TRUE(compile_err != nullptr);
+
+    ch_free_compile_error(compile_err);
+}
+
+static
+const char * BAD_PATTERNS[] = {
+    // unmatched parens
+    "(foo",
+    "foo)",
+    "((foo)",
+    "(foo))",
+    // nothing to repeat
+    "a+++",
+    "a+?+",
+    "a???",
+    "a??+",
+    "?qa",
+    "*abc",
+    "+abc",
+    // repeating boundaries is not allowed (UE-1007)
+    "^?0",
+    "^*0",
+    "^+0",
+    "^{1,3}0",
+    "0$?",
+    "0$*",
+    "0$+",
+    "0${1,3}",
+    // char classes
+    "[]",
+    "[]foobar",
+    "[`-\\80",
+    // bad named classes
+    "[[:foo:]]",
+    "[[:1234:]]",
+    "[[:f\\oo:]]",
+    "[[: :]]",
+    "[[:...:]]",
+    "[[:l\\ower:]]",
+    "[[:abc\\:]]",
+    "[abc[:x\\]pqr:]]",
+    "[[:a\\dz:]]",
+    "foobar\\", // trailing unescaped backslash
+};
+
+INSTANTIATE_TEST_CASE_P(Compile, HybridCompile, ValuesIn(BAD_PATTERNS));

unit/chimera/compat.cpp

@@ -0,0 +1,56 @@
+/*
+ * Copyright (c) 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 "gtest/gtest.h"
+#include "chimera/ch.h"
+#include "hs.h"
+
+// We currently depend on our common (meaning) hash defines having the same
+// values.
+TEST(HybridCompat, Defines) {
+    // flags
+    EXPECT_EQ(HS_FLAG_CASELESS, CH_FLAG_CASELESS);
+    EXPECT_EQ(HS_FLAG_DOTALL, CH_FLAG_DOTALL);
+    EXPECT_EQ(HS_FLAG_MULTILINE, CH_FLAG_MULTILINE);
+    EXPECT_EQ(HS_FLAG_SINGLEMATCH, CH_FLAG_SINGLEMATCH);
+    EXPECT_EQ(HS_FLAG_UTF8, CH_FLAG_UTF8);
+    EXPECT_EQ(HS_FLAG_UCP, CH_FLAG_UCP);
+
+    // errors
+    EXPECT_EQ(HS_SUCCESS, CH_SUCCESS);
+    EXPECT_EQ(HS_INVALID, CH_INVALID);
+    EXPECT_EQ(HS_NOMEM, CH_NOMEM);
+    EXPECT_EQ(HS_SCAN_TERMINATED, CH_SCAN_TERMINATED);
+    EXPECT_EQ(HS_COMPILER_ERROR, CH_COMPILER_ERROR);
+    EXPECT_EQ(HS_DB_VERSION_ERROR, CH_DB_VERSION_ERROR);
+    EXPECT_EQ(HS_DB_PLATFORM_ERROR, CH_DB_PLATFORM_ERROR);
+    EXPECT_EQ(HS_DB_MODE_ERROR, CH_DB_MODE_ERROR);
+    EXPECT_EQ(HS_BAD_ALIGN, CH_BAD_ALIGN);
+    EXPECT_EQ(HS_BAD_ALLOC, CH_BAD_ALLOC);
+    EXPECT_EQ(HS_SCRATCH_IN_USE, CH_SCRATCH_IN_USE);
+}

unit/chimera/main.cpp

@@ -0,0 +1,35 @@
+/*
+ * Copyright (c) 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 "gtest/gtest.h"
+
+// Driver: run all the tests (defined in other source files in this directory)
+int main(int argc, char **argv) {
+    testing::InitGoogleTest(&argc, argv);
+    return RUN_ALL_TESTS();
+}

unit/chimera/scan.cpp

@@ -0,0 +1,551 @@
+/*
+ * Copyright (c) 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 <vector>
+#include <tuple>
+
+#include "gtest/gtest.h"
+#include "chimera/ch.h"
+
+using namespace std;
+using namespace testing;
+
+namespace {
+
+class HybridScanParams {
+public:
+    HybridScanParams() {}
+    HybridScanParams(const char *s, unsigned int f)
+        : patterns(1, s), flags(1, f) {}
+
+    void add(const char *pattern, unsigned int myflags) {
+        patterns.push_back(pattern);
+        flags.push_back(myflags);
+    }
+
+    size_t size() const {
+        return patterns.size();
+    }
+
+    const char * const * getPatterns() const {
+        return &patterns[0];
+    }
+
+    const unsigned int * getFlags() const {
+        return &flags[0];
+    }
+
+private:
+    vector<const char *> patterns;
+    vector<unsigned int> flags;
+};
+
+static
+vector<HybridScanParams> paramFactory() {
+    vector<HybridScanParams> hsp;
+
+    // Some simple single-pattern cases.
+    hsp.push_back(HybridScanParams(".", CH_FLAG_DOTALL));
+    hsp.push_back(HybridScanParams("foobar", 0));
+    hsp.push_back(HybridScanParams("foo.*bar", 0));
+    hsp.push_back(HybridScanParams("fred.*bill", CH_FLAG_DOTALL));
+    hsp.push_back(HybridScanParams(".*", 0)); // vacuosity!
+    hsp.push_back(HybridScanParams("\\A(.?.{7,27}jf[tmqq]l(f|t|hgmr.+.fg|abks)){3,7}", 0));
+    hsp.push_back(HybridScanParams("^begin", CH_FLAG_MULTILINE));
+    hsp.push_back(HybridScanParams("match", CH_FLAG_SINGLEMATCH));
+
+    // Single-pattern cases where the pattern isn't supported by hyperscan but
+    // can be prefiltered.
+    hsp.push_back(HybridScanParams("foo(?!bar)", 0));
+    hsp.push_back(HybridScanParams("(sens|respons)e and \\1ibility", 0));
+
+    // A case that can't be prefiltered (as of this writing) because it's too
+    // gosh-darned big. This tests that the hybrid matcher can run without the
+    // multi-matcher (or with a "fake" one).
+    hsp.push_back(HybridScanParams("((c(p|p)h{2,}bh.|p|((((cq|j|c|(\\b)|.[^nbgn]|(\\B)[qfh]a)){10,12}|ih|a|mnde[pa].|.g)){5,8})){3}", 0));
+
+    // Simple multi-pattern literal case.
+    hsp.push_back(HybridScanParams());
+    hsp.back().add("hatstand", 0);
+    hsp.back().add("teakettle", 0);
+    hsp.back().add("badgerbrush", 0);
+    hsp.back().add("mnemosyne", 0);
+
+    // More complex multi-pattern case.
+    hsp.push_back(HybridScanParams());
+    hsp.back().add("foo.{3,7}bar", 0);
+    hsp.back().add("foo.{30,70}bar", 0);
+    hsp.back().add("foobar.*foobar", 0);
+    hsp.back().add("^blingwrapper.*foo", 0);
+    hsp.back().add("[0-9a-f]{70,}\\n", 0);
+
+    // A couple of trivial Unicode patterns, mostly to make sure we accept
+    // the flags.
+    hsp.push_back(HybridScanParams());
+    hsp.back().add("foo.*bar", CH_FLAG_UTF8);
+    hsp.back().add("today", CH_FLAG_UTF8|CH_FLAG_UCP);
+
+    // PCRE exotica.
+    hsp.push_back(HybridScanParams());
+    hsp.back().add("benign literal", 0);
+    hsp.back().add("(?|(abc)|(def))\\1", 0);
+    hsp.back().add("(?|(abc)|(def))(?1)", 0);
+    hsp.back().add("(sens|respons)e and \\1ibility", 0);
+    hsp.back().add("\\w+(?=;)", 0);
+    hsp.back().add("foo(?!bar)", 0);
+    hsp.back().add("(?<=bullock|donkey)", 0);
+
+    return hsp;
+}
+
+// Dummy callback.
+static
+ch_callback_t dummyHandler(unsigned, unsigned long long, unsigned long long,
+                           unsigned, unsigned,const ch_capture_t *, void *) {
+    // empty
+    return CH_CALLBACK_CONTINUE;
+}
+
+static
+void checkGroups(unsigned int num, const ch_capture_t *captured) {
+    // We should have _some_ group info.
+    ASSERT_LT(0U, num);
+    ASSERT_TRUE(captured != nullptr);
+
+    // Group 0 is always active.
+    ASSERT_TRUE(captured[0].flags & CH_CAPTURE_FLAG_ACTIVE);
+
+    // Sanity-checking.
+    for (unsigned int i = 0; i < num; i++) {
+        if (!(captured[i].flags & CH_CAPTURE_FLAG_ACTIVE)) {
+            continue;
+        }
+        ASSERT_LE(captured[i].from, captured[i].to) << "Group " << i
+                  << "not sane.";
+    }
+}
+
+// Dummy callback that checks that we had some groups set.
+static
+ch_callback_t dummyGroupHandler(unsigned, unsigned long long,
+                                unsigned long long, unsigned, unsigned num,
+                                const ch_capture_t *captured, void *) {
+    checkGroups(num, captured);
+    return CH_CALLBACK_CONTINUE;
+}
+
+class HybridScan : public TestWithParam<tuple<HybridScanParams, bool>> {
+protected:
+    virtual void SetUp() {
+        ch_error_t err;
+        ch_compile_error_t *compile_err = nullptr;
+        const HybridScanParams &hsp = get<0>(GetParam());
+        groups = get<1>(GetParam());
+
+        err = ch_compile_ext_multi(hsp.getPatterns(), hsp.getFlags(), nullptr,
+                                   hsp.size(), groups ? CH_MODE_GROUPS :
+                                   CH_MODE_NOGROUPS, 10000000, 8000,
+                                   nullptr, &db, &compile_err);
+        ASSERT_EQ(err, CH_SUCCESS);
+        ASSERT_TRUE(db != nullptr);
+
+        err = ch_alloc_scratch(db, &scratch);
+        ASSERT_EQ(err, CH_SUCCESS);
+        ASSERT_TRUE(scratch != nullptr);
+    }
+
+    virtual void TearDown() {
+        ch_free_database(db);
+        ch_free_scratch(scratch);
+    }
+
+    ch_database_t *db = nullptr;
+    ch_scratch_t *scratch = nullptr;
+    bool groups;
+};
+
+static const string SCAN_DATA(
+    "Beware the Jabberwock, my son!\n"
+    "The jaws that bite, the claws that catch!\n"
+    "Beware the Jubjub bird, and shun\n"
+    "The frumious Bandersnatch!\n");
+
+TEST_P(HybridScan, BuildAndScan) {
+    ASSERT_TRUE(db != nullptr);
+
+    size_t sz;
+    ch_error_t err = ch_database_size(db, &sz);
+    ASSERT_EQ(CH_SUCCESS, err);
+    ASSERT_LT(16U, sz);
+
+    ch_match_event_handler cb = groups ? dummyGroupHandler : dummyHandler;
+
+    err = ch_scan(db, SCAN_DATA.c_str(), SCAN_DATA.length(), 0,
+                  scratch, cb, nullptr, nullptr);
+    ASSERT_EQ(CH_SUCCESS, err);
+}
+
+TEST_P(HybridScan, ScanNearly4KData) {
+    ASSERT_TRUE(db != nullptr);
+
+    string data(4000, '*'); // it's full of stars!
+
+    // Insert some strings that will match a few patterns.
+    data.insert(278, "foo");
+    data.insert(285, "bar");
+    data.insert(1178, "foobar");
+    data.insert(1894, "bar");
+    data.insert(3000, "foobar");
+
+    ch_match_event_handler cb = groups ? dummyGroupHandler : dummyHandler;
+
+    ch_error_t err = ch_scan(db, data.c_str(), data.length(), 0,
+                             scratch, cb, nullptr, nullptr);
+    ASSERT_EQ(CH_SUCCESS, err);
+}
+
+TEST_P(HybridScan, ScanBigData) {
+    ASSERT_TRUE(db != nullptr);
+
+    // More than 4MB, as that pushes us into using PCRE for non-Pawn cases.
+    string data(5*1024*1024, '*'); // it's full of stars!
+
+    // Insert some strings that will match a few patterns.
+    data.insert(278, "foo");
+    data.insert(285, "bar");
+    data.insert(1178, "foobar");
+    data.insert(1894, "bar");
+    data.insert(3000, "foobar");
+
+    ch_match_event_handler cb = groups ? dummyGroupHandler : dummyHandler;
+
+    ch_error_t err = ch_scan(db, data.c_str(), data.length(), 0,
+                             scratch, cb, nullptr, nullptr);
+    ASSERT_EQ(CH_SUCCESS, err);
+}
+
+TEST_P(HybridScan, ScanClonedScratch) {
+    ASSERT_TRUE(db != nullptr);
+
+    ch_error_t err;
+    ch_scratch_t *clonedScratch = nullptr;
+    err = ch_clone_scratch(scratch, &clonedScratch);
+    ASSERT_EQ(CH_SUCCESS, err);
+
+    ch_match_event_handler cb = groups ? dummyGroupHandler : dummyHandler;
+
+    err = ch_scan(db, SCAN_DATA.c_str(), SCAN_DATA.length(), 0,
+                  clonedScratch, cb, nullptr, nullptr);
+    ASSERT_EQ(CH_SUCCESS, err);
+
+    ch_free_scratch(clonedScratch);
+}
+
+TEST_P(HybridScan, DatabaseInfo) {
+    ASSERT_TRUE(db != nullptr);
+
+    char *info = nullptr;
+    ch_error_t err = ch_database_info(db, &info);
+    ASSERT_EQ(CH_SUCCESS, err);
+    ASSERT_TRUE(info != nullptr);
+
+    const string strinfo(info);
+    const string prefix("Chimera ");
+    ASSERT_GE(strinfo.size(), prefix.size());
+    ASSERT_EQ(prefix, strinfo.substr(0, prefix.size()));
+
+    free(info);
+}
+
+TEST_P(HybridScan, NonZeroScratchSize) {
+    ASSERT_TRUE(db != nullptr);
+    size_t curr_size;
+    ch_error_t err = ch_scratch_size(scratch, &curr_size);
+    ASSERT_EQ(CH_SUCCESS, err);
+    ASSERT_LT(0, curr_size);
+}
+
+INSTANTIATE_TEST_CASE_P(Scan, HybridScan,
+                        Combine(ValuesIn(paramFactory()), Bool()));
+
+// Counting callback that returns CH_CALLBACK_CONTINUE.
+static
+ch_callback_t countHandler(unsigned, unsigned long long, unsigned long long,
+                           unsigned, unsigned, const ch_capture_t *,
+                           void *ctx) {
+    unsigned int *count = (unsigned int *)ctx;
+    ++(*count);
+    return CH_CALLBACK_CONTINUE;
+}
+
+// Counting callback that returns CH_CALLBACK_SKIP_PATTERN.
+static
+ch_callback_t skipHandler(unsigned, unsigned long long, unsigned long long,
+                          unsigned, unsigned, const ch_capture_t *,
+                          void *ctx) {
+    unsigned int *count = (unsigned int *)ctx;
+    ++(*count);
+    return CH_CALLBACK_SKIP_PATTERN;
+}
+
+// Counting callback that returns CH_CALLBACK_TERMINATE.
+static
+ch_callback_t terminateHandler(unsigned, unsigned long long, unsigned long long,
+                               unsigned, unsigned, const ch_capture_t *,
+                               void *ctx) {
+    unsigned int *count = (unsigned int *)ctx;
+    ++(*count);
+    return CH_CALLBACK_TERMINATE;
+}
+
+static
+void makeDatabase(ch_database_t **db, const char * const expr[], size_t num) {
+    *db = nullptr;
+    ch_compile_error_t *compile_err = nullptr;
+    ch_error_t err = ch_compile_ext_multi(expr, nullptr, nullptr, num, 0,
+                                          10000000, 8000, nullptr, db,
+                                          &compile_err);
+    ASSERT_EQ(CH_SUCCESS, err);
+    ASSERT_TRUE(*db != nullptr);
+}
+
+struct RescanContext {
+    RescanContext(const ch_database_t *db_in, ch_scratch_t *scratch_in)
+        : db(db_in), scratch(scratch_in) {}
+    const ch_database_t *db;
+    ch_scratch_t *scratch;
+    size_t matches = 0;
+};
+
+static
+int rescan_block_cb(unsigned, unsigned long long, unsigned long long, unsigned,
+                    unsigned, const ch_capture_t *, void *ctx) {
+    RescanContext *rctx = (RescanContext *)ctx;
+    rctx->matches++;
+
+    const string data = "___foo___bar_";
+
+    hs_error_t err = ch_scan(rctx->db, data.c_str(), data.length(), 0,
+                             rctx->scratch, nullptr, nullptr, nullptr);
+    EXPECT_EQ(CH_SCRATCH_IN_USE, err);
+    return 0;
+}
+
+TEST(Scan, ScratchInUse) {
+    static const char * const expr[] = { "foo.*bar" };
+    ch_database_t *db = nullptr;
+    makeDatabase(&db, expr, 1);
+
+    ch_scratch_t *scratch = nullptr;
+    ch_error_t err = ch_alloc_scratch(db, &scratch);
+    ASSERT_EQ(CH_SUCCESS, err);
+    ASSERT_TRUE(scratch != nullptr);
+
+    RescanContext rc(db, scratch);
+
+    const string data("___foo___bar_");
+    err = ch_scan(db, data.c_str(), data.length(), 0,
+                  scratch, rescan_block_cb, 0, &rc);
+    ASSERT_EQ(CH_SUCCESS, err);
+    ASSERT_EQ(1U, rc.matches);
+
+    ch_free_scratch(scratch);
+    ch_free_database(db);
+}
+
+TEST(Scan, CallbackSkip1) {
+    static const char * const expr[] = { "." };
+    ch_database_t *db = nullptr;
+    makeDatabase(&db, expr, 1);
+
+    ch_scratch_t *scratch = nullptr;
+    ch_error_t err = ch_alloc_scratch(db, &scratch);
+    ASSERT_EQ(CH_SUCCESS, err);
+    ASSERT_TRUE(scratch != nullptr);
+
+    unsigned int count = 0;
+    const string data("qwertyuiop");
+    err = ch_scan(db, data.c_str(), data.length(), 0,
+                  scratch, skipHandler, 0, &count);
+    ASSERT_EQ(CH_SUCCESS, err);
+    ASSERT_EQ(1U, count);
+
+    ch_free_scratch(scratch);
+    ch_free_database(db);
+}
+
+TEST(Scan, CallbackSkip2) {
+    static const char * const expr[] = { "[a-z]+", "[0-9]" };
+    ch_database_t *db = nullptr;
+    makeDatabase(&db, expr, 2);
+
+    ch_scratch_t *scratch = nullptr;
+    ch_error_t err = ch_alloc_scratch(db, &scratch);
+    ASSERT_EQ(CH_SUCCESS, err);
+    ASSERT_TRUE(scratch != nullptr);
+
+    unsigned int count = 0;
+    const string data("foo 0123 0 bar 39483 n34jfhlqekrcoi3q4");
+    err = ch_scan(db, data.c_str(), data.length(), 0,
+                  scratch, skipHandler, 0, &count);
+    ASSERT_EQ(CH_SUCCESS, err);
+    ASSERT_EQ(2U, count); // both patterns should match once
+
+    ch_free_scratch(scratch);
+    ch_free_database(db);
+}
+
+// This case includes a pattern that we use libpcre for.
+TEST(Scan, CallbackSkip3) {
+    static const char * const expr[] = { "[a-z]+", "foo(?!bar)" };
+    ch_database_t *db = nullptr;
+    makeDatabase(&db, expr, 2);
+
+    ch_scratch_t *scratch = nullptr;
+    ch_error_t err = ch_alloc_scratch(db, &scratch);
+    ASSERT_EQ(CH_SUCCESS, err);
+    ASSERT_TRUE(scratch != nullptr);
+
+    unsigned int count = 0;
+    const string data("foobaz foobing foobar");
+    err = ch_scan(db, data.c_str(), data.length(), 0,
+                  scratch, skipHandler, 0, &count);
+    ASSERT_EQ(CH_SUCCESS, err);
+    ASSERT_EQ(2U, count); // both patterns should match once
+
+    ch_free_scratch(scratch);
+    ch_free_database(db);
+}
+
+TEST(Scan, CallbackNoSkip1) {
+    static const char * const expr[] = { "foo|bar", "[0-9]{3}" };
+    ch_database_t *db = nullptr;
+    makeDatabase(&db, expr, 2);
+
+    ch_scratch_t *scratch = nullptr;
+    ch_error_t err = ch_alloc_scratch(db, &scratch);
+    ASSERT_EQ(CH_SUCCESS, err);
+    ASSERT_TRUE(scratch != nullptr);
+
+    unsigned int count = 0;
+    const string data("foo 012 bar 345 foobar 678");
+    err = ch_scan(db, data.c_str(), data.length(), 0,
+                  scratch, countHandler, 0, &count);
+    ASSERT_EQ(CH_SUCCESS, err);
+    ASSERT_EQ(7U, count); // seven matches in total
+
+    ch_free_scratch(scratch);
+    ch_free_database(db);
+}
+
+TEST(Scan, CallbackNoSkip2) {
+    static const char * const expr[] = { "foo(?!bar)", "[0-9]{3}" };
+    ch_database_t *db = nullptr;
+    makeDatabase(&db, expr, 2);
+
+    ch_scratch_t *scratch = nullptr;
+    ch_error_t err = ch_alloc_scratch(db, &scratch);
+    ASSERT_EQ(CH_SUCCESS, err);
+    ASSERT_TRUE(scratch != nullptr);
+
+    unsigned int count = 0;
+    const string data("foo 012 bar 345 foobar 678");
+    err = ch_scan(db, data.c_str(), data.length(), 0,
+                  scratch, countHandler, 0, &count);
+    ASSERT_EQ(CH_SUCCESS, err);
+    ASSERT_EQ(4U, count); // four matches in total
+
+    ch_free_scratch(scratch);
+    ch_free_database(db);
+}
+
+TEST(Scan, CallbackTerm1) {
+    static const char * const expr[] = { "." };
+    ch_database_t *db = nullptr;
+    makeDatabase(&db, expr, 1);
+
+    ch_scratch_t *scratch = nullptr;
+    ch_error_t err = ch_alloc_scratch(db, &scratch);
+    ASSERT_EQ(CH_SUCCESS, err);
+    ASSERT_TRUE(scratch != nullptr);
+
+    unsigned int count = 0;
+    const string data("qwertyuiop");
+    err = ch_scan(db, data.c_str(), data.length(), 0,
+                  scratch, terminateHandler, 0, &count);
+    ASSERT_EQ(CH_SCAN_TERMINATED, err);
+    ASSERT_EQ(1U, count);
+
+    ch_free_scratch(scratch);
+    ch_free_database(db);
+}
+
+TEST(Scan, CallbackTerm2) {
+    static const char * const expr[] = { "[a-z]+", "[0-9]" };
+    ch_database_t *db = nullptr;
+    makeDatabase(&db, expr, 2);
+
+    ch_scratch_t *scratch = nullptr;
+    ch_error_t err = ch_alloc_scratch(db, &scratch);
+    ASSERT_EQ(CH_SUCCESS, err);
+    ASSERT_TRUE(scratch != 0);
+
+    unsigned int count = 0;
+    const string data("foo 0123 0 bar 39483 n34jfhlqekrcoi3q4");
+    err = ch_scan(db, data.c_str(), data.length(), 0,
+                  scratch, terminateHandler, 0, &count);
+    ASSERT_EQ(CH_SCAN_TERMINATED, err);
+    ASSERT_EQ(1U, count);
+
+    ch_free_scratch(scratch);
+    ch_free_database(db);
+}
+
+// This case includes a pattern that we use libpcre for.
+TEST(Scan, CallbackTerm3) {
+    static const char * const expr[] = { "[a-z]+", "foo(?!bar)" };
+    ch_database_t *db = nullptr;
+    makeDatabase(&db, expr, 2);
+
+    ch_scratch_t *scratch = nullptr;
+    ch_error_t err = ch_alloc_scratch(db, &scratch);
+    ASSERT_EQ(CH_SUCCESS, err);
+    ASSERT_TRUE(scratch != nullptr);
+
+    unsigned int count = 0;
+    const string data("foobaz foobing foobar");
+    err = ch_scan(db, data.c_str(), data.length(), 0,
+                  scratch, terminateHandler, 0, &count);
+    ASSERT_EQ(CH_SCAN_TERMINATED, err);
+    ASSERT_EQ(1U, count);
+
+    ch_free_scratch(scratch);
+    ch_free_database(db);
+}
+
+} // namespace