linux-sgx-trts-modified/external/vtune/linux/include/jitprofiling.h

/* <copyright>
  This file is provided under a dual BSD/GPLv2 license.  When using or
  redistributing this file, you may do so under either license.

  GPL LICENSE SUMMARY

  Copyright (c) 2005-2014 Intel Corporation. All rights reserved.

  This program is free software; you can redistribute it and/or modify
  it under the terms of version 2 of the GNU General Public License as
  published by the Free Software Foundation.

  This program is distributed in the hope that it will be useful, but
  WITHOUT ANY WARRANTY; without even the implied warranty of
  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
  General Public License for more details.

  You should have received a copy of the GNU General Public License
  along with this program; if not, write to the Free Software
  Foundation, Inc., 51 Franklin St - Fifth Floor, Boston, MA 02110-1301 USA.
  The full GNU General Public License is included in this distribution
  in the file called LICENSE.GPL.

  Contact Information:
  http://software.intel.com/en-us/articles/intel-vtune-amplifier-xe/

  BSD LICENSE

  Copyright (c) 2005-2014 Intel Corporation. All rights reserved.
  All rights reserved.

  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.
</copyright> */

#ifndef __JITPROFILING_H__
#define __JITPROFILING_H__

/**
 * @brief JIT Profiling APIs
 *
 * The JIT Profiling API is used to report information about just-in-time
 * generated code that can be used by performance tools. The user inserts
 * calls in the code generator to report information before JIT-compiled
 * code goes to execution. This information is collected at runtime and used
 * by tools like Intel(R) VTune(TM) Amplifier to display performance metrics
 * associated with JIT-compiled code.
 *
 * These APIs can be used to\n
 * - **Profile trace-based and method-based JIT-compiled
 * code**. Some examples of environments that you can profile with these APIs:
 * dynamic JIT compilation of JavaScript code traces, JIT execution in OpenCL(TM)
 * software technology, Java/.NET managed execution environments, and custom
 * ISV JIT engines.
 * @code
 * #include <jitprofiling.h>
 *
 * if (iJIT_IsProfilingActive != iJIT_SAMPLING_ON) {
 *     return;
 * }
 *
 * iJIT_Method_Load jmethod = {0};
 * jmethod.method_id = iJIT_GetNewMethodID();
 * jmethod.method_name = "method_name";
 * jmethod.class_file_name = "class_name";
 * jmethod.source_file_name = "source_file_name";
 * jmethod.method_load_address = code_addr;
 * jmethod.method_size = code_size;
 *
 * iJIT_NotifyEvent(iJVM_EVENT_TYPE_METHOD_LOAD_FINISHED, (void*)&jmethod);
 * iJIT_NotifyEvent(iJVM_EVENT_TYPE_SHUTDOWN, NULL);
 * @endcode
 *
 *  * Expected behavior:
 *    * If any iJVM_EVENT_TYPE_METHOD_LOAD_FINISHED event overwrites an
 *      already reported method, then such a method becomes invalid and its
 *      memory region is treated as unloaded. VTune Amplifier displays the metrics
 *      collected by the method until it is overwritten.
 *    * If supplied line number information contains multiple source lines for
 *      the same assembly instruction (code location), then VTune Amplifier picks up
 *      the first line number.
 *    * Dynamically generated code can be associated with a module name.
 *      Use the iJIT_Method_Load_V2 structure.\n
 *      Clarification of some cases:
 *        * If you register a function with the same method ID multiple times,
 *          specifying different module names, then the VTune Amplifier picks up
 *          the module name registered first. If you want to distinguish the same
 *          function between different JIT engines, supply different method IDs for
 *          each function. Other symbolic information (for example, source file)
 *          can be identical.
 *
 * - **Analyze split functions** (multiple joint or disjoint code regions
 * belonging to the same function) **including re-JIT**
 * with potential overlapping of code regions in time, which is common in
 * resource-limited environments.
 * @code
 * #include <jitprofiling.h>
 *
 * unsigned int method_id = iJIT_GetNewMethodID();
 *
 * iJIT_Method_Load a = {0};
 * a.method_id = method_id;
 * a.method_load_address = 0x100;
 * a.method_size = 0x20;
 *
 * iJIT_Method_Load b = {0};
 * b.method_id = method_id;
 * b.method_load_address = 0x200;
 * b.method_size = 0x30;
 *
 * iJIT_NotifyEvent(iJVM_EVENT_TYPE_METHOD_LOAD_FINISHED, (void*)&a);
 * iJIT_NotifyEvent(iJVM_EVENT_TYPE_METHOD_LOAD_FINISHED, (void*)&b);
 * @endcode
 *
 *  * Expected behaviour:
 *      * If a iJVM_EVENT_TYPE_METHOD_LOAD_FINISHED event overwrites an
 *        already reported method, then such a method becomes invalid and
 *        its memory region is treated as unloaded.
 *      * All code regions reported with the same method ID are considered as
 *        belonging to the same method. Symbolic information (method name,
 *        source file name) will be taken from the first notification, and all
 *        subsequent notifications with the same method ID will be processed
 *        only for line number table information. So, the VTune Amplifier will map
 *        samples to a source line using the line number table from the current
 *        notification while taking the source file name from the very first one.\n
 *        Clarification of some cases:\n
 *          * If you register a second code region with a different source file
 *          name and the same method ID, then this information will be saved and
 *          will not be considered as an extension of the first code region, but
 *          VTune Amplifier will use the source file of the first code region and map
 *          performance metrics incorrectly.
 *          * If you register a second code region with the same source file as
 *          for the first region and the same method ID, then the source file will be
 *          discarded but VTune Amplifier will map metrics to the source file correctly.
 *          * If you register a second code region with a null source file and
 *          the same method ID, then provided line number info will be associated
 *          with the source file of the first code region.
 *
 * - **Explore inline functions** including multi-level hierarchy of
 * nested inline methods which shows how performance metrics are distributed through them.
 * @code
 * #include <jitprofiling.h>
 *
 *  //                                    method_id   parent_id
 *  //   [-- c --]                          3000        2000
 *  //                  [---- d -----]      2001        1000
 *  //  [---- b ----]                       2000        1000
 *  // [------------ a ----------------]    1000         n/a
 *
 * iJIT_Method_Load a = {0};
 * a.method_id = 1000;
 *
 * iJIT_Method_Inline_Load b = {0};
 * b.method_id = 2000;
 * b.parent_method_id = 1000;
 *
 * iJIT_Method_Inline_Load c = {0};
 * c.method_id = 3000;
 * c.parent_method_id = 2000;
 *
 * iJIT_Method_Inline_Load d = {0};
 * d.method_id = 2001;
 * d.parent_method_id = 1000;
 *
 * iJIT_NotifyEvent(iJVM_EVENT_TYPE_METHOD_LOAD_FINISHED, (void*)&a);
 * iJIT_NotifyEvent(iJVM_EVENT_TYPE_METHOD_INLINE_LOAD_FINISHED, (void*)&b);
 * iJIT_NotifyEvent(iJVM_EVENT_TYPE_METHOD_INLINE_LOAD_FINISHED, (void*)&c);
 * iJIT_NotifyEvent(iJVM_EVENT_TYPE_METHOD_INLINE_LOAD_FINISHED, (void*)&d);
 * @endcode
 *
 *  * Requirements:
 *      * Each inline (iJIT_Method_Inline_Load) method should be associated
 *        with two method IDs: one for itself; one for its immediate parent.
 *      * Address regions of inline methods of the same parent method cannot
 *        overlap each other.
 *      * Execution of the parent method must not be started until it and all
 *        its inline methods are reported.
 *  * Expected behaviour:
 *      * In case of nested inline methods an order of
 *        iJVM_EVENT_TYPE_METHOD_INLINE_LOAD_FINISHED events is not important.
 *      * If any event overwrites either inline method or top parent method,
 *        then the parent, including inline methods, becomes invalid and its memory
 *        region is treated as unloaded.
 *
 * **Life time of allocated data**\n
 * The client sends an event notification to the agent with event-specific
 * data, which is a structure. The pointers in the structure refer to memory
 * allocated by the client, which responsible for releasing it. The pointers are
 * used by the iJIT_NotifyEvent method to copy client's data in a trace file,
 * and they are not used after the iJIT_NotifyEvent method returns.
 */

/**
 * @defgroup jitapi JIT Profiling
 * @ingroup internal
 * @{
 */

/**
 * @brief Enumerator for the types of notifications
 */
typedef enum iJIT_jvm_event
{
    iJVM_EVENT_TYPE_SHUTDOWN = 2,               /**<\brief Send this to shutdown the agent.
                                                 * Use NULL for event data. */

    iJVM_EVENT_TYPE_METHOD_LOAD_FINISHED = 13,  /**<\brief Send when dynamic code is
                                                 * JIT compiled and loaded into
                                                 * memory by the JIT engine, but
                                                 * before the code is executed.
                                                 * Use iJIT_Method_Load as event
                                                 * data. */
/** @cond exclude_from_documentation */
    iJVM_EVENT_TYPE_METHOD_UNLOAD_START,    /**<\brief Send when compiled dynamic
                                             * code is being unloaded from memory.
                                             * Use iJIT_Method_Load as event data.*/
/** @endcond */

    iJVM_EVENT_TYPE_METHOD_UPDATE,   /**<\brief Send to provide new content for
                                      * a previously reported dynamic code.
                                      * The previous content will be invalidated
                                      * starting from the time of the notification.
                                      * Use iJIT_Method_Load as event data but
                                      * required fields are following:
                                      * - method_id    identify the code to update.
                                      * - method_load_address    specify start address
                                      *                          within identified code range
                                      *                          where update should be started.
                                      * - method_size            specify length of updated code
                                      *                          range. */


    iJVM_EVENT_TYPE_METHOD_INLINE_LOAD_FINISHED, /**<\brief Send when an inline dynamic
                                                  * code is JIT compiled and loaded
                                                  * into memory by the JIT engine,
                                                  * but before the parent code region
                                                  * starts executing.
                                                  * Use iJIT_Method_Inline_Load as event data.*/

/** @cond exclude_from_documentation */
    iJVM_EVENT_TYPE_METHOD_UPDATE_V2,
/** @endcond */

    iJVM_EVENT_TYPE_METHOD_LOAD_FINISHED_V2 = 21, /**<\brief Send when a dynamic code is
                                                   * JIT compiled and loaded into
                                                   * memory by the JIT engine, but
                                                   * before the code is executed.
                                                   * Use iJIT_Method_Load_V2 as event data. */

    iJVM_EVENT_TYPE_METHOD_LOAD_FINISHED_V3       /**<\brief Send when a dynamic code is
                                                   * JIT compiled and loaded into
                                                   * memory by the JIT engine, but
                                                   * before the code is executed.
                                                   * Use iJIT_Method_Load_V3 as event data. */
} iJIT_JVM_EVENT;

/**
 * @brief Enumerator for the agent's mode
 */
typedef enum _iJIT_IsProfilingActiveFlags
{
    iJIT_NOTHING_RUNNING           = 0x0000,    /**<\brief The agent is not running;
                                                 * iJIT_NotifyEvent calls will
                                                 * not be processed. */
    iJIT_SAMPLING_ON               = 0x0001,    /**<\brief The agent is running and
                                                 * ready to process notifications. */
} iJIT_IsProfilingActiveFlags;

/**
 * @brief Description of a single entry in the line number information of a code region.
 * @details A table of line number entries gives information about how the reported code region
 * is mapped to source file.
 * Intel(R) VTune(TM) Amplifier uses line number information to attribute
 * the samples (virtual address) to a line number. \n
 * It is acceptable to report different code addresses for the same source line:
 * @code
 *   Offset LineNumber
 *      1       2
 *      12      4
 *      15      2
 *      18      1
 *      21      30
 *
 *  VTune Amplifier constructs the following table using the client data
 *
 *   Code subrange  Line number
 *      0-1             2
 *      1-12            4
 *      12-15           2
 *      15-18           1
 *      18-21           30
 * @endcode
 */
typedef struct _LineNumberInfo
{
    unsigned int Offset;     /**<\brief Offset from the begining of the code region. */
    unsigned int LineNumber; /**<\brief Matching source line number offset (from beginning of source file). */

} *pLineNumberInfo, LineNumberInfo;

/**
 * @brief Enumerator for the code architecture.
 */
typedef enum _iJIT_CodeArchitecture
{
    iJIT_CA_NATIVE = 0, /**<\brief Native to the process architecture that is calling it. */

    iJIT_CA_32,         /**<\brief 32-bit machine code. */

    iJIT_CA_64          /**<\brief 64-bit machine code. */

} iJIT_CodeArchitecture;

#pragma pack(push, 8)

/**
 * @brief Description of a JIT-compiled method
 * @details When you use the iJIT_Method_Load structure to describe
 *  the JIT compiled method, use iJVM_EVENT_TYPE_METHOD_LOAD_FINISHED
 *  as an event type to report it.
 */
typedef struct _iJIT_Method_Load
{
    unsigned int method_id; /**<\brief Unique method ID. Cannot be 0.
                             *  You must either use the API function
                             *  iJIT_GetNewMethodID to get a valid and unique
                             *  method ID, or else manage ID uniqueness
                             *  and correct range by yourself.\n
                             *  You must use the same method ID for all code
                             *  regions of the same method, otherwise different
                             *  method IDs specify different methods. */

    char* method_name; /**<\brief The name of the method. It can be optionally
                        *  prefixed with its class name and appended with
                        *  its complete signature. Can't be NULL. */

    void* method_load_address; /**<\brief The start virtual address of the method code
                                *  region. If NULL, data provided with
                                *  event are not accepted. */

    unsigned int method_size; /**<\brief The code size of the method in memory.
                               *  If 0, then data provided with the event are not
                               *  accepted. */

    unsigned int line_number_size; /**<\brief The number of entries in the line number
                                    *  table.0 if none. */

    pLineNumberInfo line_number_table; /**<\brief Pointer to the line numbers info
                                        *  array. Can be NULL if
                                        *  line_number_size is 0. See
                                        *  LineNumberInfo Structure for a
                                        *  description of a single entry in
                                        *  the line number info array */

    unsigned int class_id; /**<\brief This field is obsolete. */

    char* class_file_name; /**<\brief Class name. Can be NULL.*/

    char* source_file_name; /**<\brief Source file name. Can be NULL.*/

} *piJIT_Method_Load, iJIT_Method_Load;

/**
 * @brief Description of a JIT-compiled method
 * @details When you use the iJIT_Method_Load_V2 structure to describe
 *  the JIT compiled method, use iJVM_EVENT_TYPE_METHOD_LOAD_FINISHED_V2
 *  as an event type to report it.
 */
typedef struct _iJIT_Method_Load_V2
{
    unsigned int method_id; /**<\brief Unique method ID. Cannot be 0.
                             *  You must either use the API function
                             *  iJIT_GetNewMethodID to get a valid and unique
                             *  method ID, or else manage ID uniqueness
                             *  and correct range by yourself.\n
                             *  You must use the same method ID for all code
                             *  regions of the same method, otherwise different
                             *  method IDs specify different methods. */

    char* method_name; /**<\brief The name of the method. It can be optionally
                        *  prefixed with its class name and appended with
                        *  its complete signature. Can't be  NULL. */

    void* method_load_address; /**<\brief The start virtual address of the method code
                                *  region. If NULL, then data provided with the
                                *  event are not accepted. */

    unsigned int method_size; /**<\brief The code size of the method in memory.
                               *  If 0, then data provided with the event are not
                               *  accepted. */

    unsigned int line_number_size; /**<\brief The number of entries in the line number
                                    *  table. 0 if none. */

    pLineNumberInfo line_number_table; /**<\brief Pointer to the line numbers info
                                        *  array. Can be NULL if
                                        *  line_number_size is 0. See
                                        *  LineNumberInfo Structure for a
                                        *  description of a single entry in
                                        *  the line number info array. */

    char* class_file_name; /**<\brief Class name. Can be NULL. */

    char* source_file_name; /**<\brief Source file name. Can be NULL. */

    char* module_name; /**<\brief Module name. Can be NULL.
                           The module name can be useful for distinguishing among
                           different JIT engines. VTune Amplifier will display
                           reported methods grouped by specific module. */

} *piJIT_Method_Load_V2, iJIT_Method_Load_V2;

/**
 * @brief Description of a JIT-compiled method
 * @details The iJIT_Method_Load_V3 structure is the same as iJIT_Method_Load_V2
 *  with a newly introduced 'arch' field that specifies architecture of the code region.
 *  When you use the iJIT_Method_Load_V3 structure to describe
 *  the JIT compiled method, use iJVM_EVENT_TYPE_METHOD_LOAD_FINISHED_V3
 *  as an event type to report it.
 */
typedef struct _iJIT_Method_Load_V3
{
    unsigned int method_id; /**<\brief Unique method ID. Cannot be 0.
                             *  You must either use the API function
                             *  iJIT_GetNewMethodID to get a valid and unique
                             *  method ID, or manage ID uniqueness
                             *  and correct range by yourself.\n
                             *  You must use the same method ID for all code
                             *  regions of the same method, otherwise they are
                             *  treated as regions of different methods. */

    char* method_name; /**<\brief The name of the method. It can be optionally
                        *  prefixed with its class name and appended with
                        *  its complete signature. Cannot be  NULL. */

    void* method_load_address; /**<\brief The start virtual address of the method code
                                *  region. If NULL, then data provided with the
                                *  event are not accepted. */

    unsigned int method_size; /**<\brief The code size of the method in memory.
                               *  If 0, then data provided with the event are not
                               *  accepted. */

    unsigned int line_number_size; /**<\brief The number of entries in the line number
                                    *  table. 0 if none. */

    pLineNumberInfo line_number_table; /**<\brief Pointer to the line numbers info
                                        *  array. Can be NULL if
                                        *  line_number_size is 0. See
                                        *  LineNumberInfo Structure for a
                                        *  description of a single entry in
                                        *  the line number info array. */

    char* class_file_name; /**<\brief Class name. Can be NULL. */

    char* source_file_name; /**<\brief Source file name. Can be NULL. */

    char* module_name; /**<\brief Module name. Can be NULL.
                        *  The module name can be useful for distinguishing among
                        *  different JIT engines. VTune Amplifier will display
                        *  reported methods grouped by specific module. */

    iJIT_CodeArchitecture module_arch; /**<\brief Architecture of the method's code region.
                                        *  By default, it is the same as the process
                                        *  architecture that is calling it.
                                        *  For example, you can use it if your 32-bit JIT
                                        *  engine generates 64-bit code.
                                        *
                                        *  If JIT engine reports both 32-bit and 64-bit types
                                        *  of methods then VTune Amplifier splits the methods
                                        *  with the same module name but with different
                                        *  architectures in two different modules. VTune Amplifier
                                        *  modifies the original name provided with a 64-bit method
                                        *  version by ending it with '(64)' */

} *piJIT_Method_Load_V3, iJIT_Method_Load_V3;

/**
 * @brief Description of an inline JIT-compiled method
 * @details When you use the_iJIT_Method_Inline_Load structure to describe
 *  the JIT compiled method, use iJVM_EVENT_TYPE_METHOD_INLINE_LOAD_FINISHED
 *  as an event type to report it.
 */
typedef struct _iJIT_Method_Inline_Load
{
    unsigned int method_id; /**<\brief Unique method ID. Cannot be 0.
                             *  You must either use the API function
                             *  iJIT_GetNewMethodID to get a valid and unique
                             *  method ID, or else manage ID uniqueness
                             *  and correct range by yourself. */

    unsigned int parent_method_id; /**<\brief Unique immediate parent's method ID.
                                    *  Cannot be 0.
                                    *  You must either use the API function
                                    *  iJIT_GetNewMethodID to get a valid and unique
                                    *  method ID, or else manage ID uniqueness
                                    *  and correct range by yourself. */

    char* method_name; /**<\brief The name of the method. It can be optionally
                        *  prefixed with its class name and appended with
                        *  its complete signature. Can't be NULL. */

    void* method_load_address;  /** <\brief The virtual address on which the method
                                 *  is inlined. If NULL, then data provided with
                                 *  the event are not accepted. */

    unsigned int method_size; /**<\brief The code size of the method in memory.
                               *  If 0, then data provided with the event are not
                               *  accepted. */

    unsigned int line_number_size; /**<\brief The number of entries in the line number
                                    *  table. 0 if none. */

    pLineNumberInfo line_number_table; /**<\brief Pointer to the line numbers info
                                        *  array. Can be NULL if
                                        *  line_number_size is 0. See
                                        *  LineNumberInfo Structure for a
                                        *  description of a single entry in
                                        *  the line number info array */

    char* class_file_name; /**<\brief Class name. Can be NULL.*/

    char* source_file_name; /**<\brief Source file name. Can be NULL.*/

} *piJIT_Method_Inline_Load, iJIT_Method_Inline_Load;

/** @cond exclude_from_documentation */
/**
 * @brief Description of a segment type
 * @details Use the segment type to specify a type of data supplied
 * with the iJVM_EVENT_TYPE_METHOD_UPDATE_V2 event to be applied to
 * a certain code trace.
 */
typedef enum _iJIT_SegmentType
{
    iJIT_CT_UNKNOWN = 0,

    iJIT_CT_CODE,           /**<\brief Executable code. */

    iJIT_CT_DATA,           /**<\brief Data (not executable code).
                             * VTune Amplifier uses the format string
                             * (see iJIT_Method_Update) to represent
                             * this data in the VTune Amplifier GUI */

    iJIT_CT_KEEP,           /**<\brief Use the previous markup for the trace.
                             * Can be used for the following
                             * iJVM_EVENT_TYPE_METHOD_UPDATE_V2 events,
                             * if the type of the previously reported segment
                             * type is the same. */
    iJIT_CT_EOF
} iJIT_SegmentType;

/**
 * @brief Description of a dynamic update of the content within JIT-compiled method
 * @details The JIT engine may generate the methods that are updated at runtime
 * partially by mixed (data + executable code) content. When you use the iJIT_Method_Update
 * structure to describe the update of the content within a JIT-compiled method,
 * use iJVM_EVENT_TYPE_METHOD_UPDATE_V2 as an event type to report it.
 *
 * On the first Update event, VTune Amplifier copies the original code range reported by
 * the iJVM_EVENT_TYPE_METHOD_LOAD event, then modifies it with the supplied bytes and
 * adds the modified range to the original method. For next update events, VTune Amplifier
 * does the same but it uses the latest modified version of a code region for update.
 * Eventually, VTune Amplifier GUI displays multiple code ranges for the method reported by
 * the iJVM_EVENT_TYPE_METHOD_LOAD event.
 * Notes:
 * - Multiple update events with different types for the same trace are allowed
 *   but they must be reported for the same code ranges.
 *   Example,
 * @code
 *                      [-- data---]        Allowed
 *          [-- code --]                    Allowed
 *        [code]                            Ignored
 *                      [-- data---]        Allowed
 *          [-- code --]                    Allowed
 *      [------------ trace ---------]
 * @endcode
 * - The types of previously reported events can be changed but they must be reported
 *   for the same code ranges.
 *   Example,
 * @code
 *          [-- data---]                    Allowed
 *          [-- code --]                    Allowed
 *          [-- data---]                    Allowed
 *          [-- code --]                    Allowed
 *      [------------ trace ---------]
 * @endcode
 */

typedef struct _iJIT_Method_Update
{
    void* load_address;         /**<\brief Start address of the update within a method */

    unsigned int size;          /**<\brief The update size */

    iJIT_SegmentType type;      /**<\brief Type of the update */

    const char* data_format;    /**<\brief C string that contains a format string
                                 * that follows the same specifications as format in printf.
                                 * The format string is used for iJIT_CT_CODE only
                                 * and cannot be NULL.
                                 * Format can be changed on the fly. */
} *piJIT_Method_Update, iJIT_Method_Update;

/** @endcond */

#pragma pack(pop)

/** @cond exclude_from_documentation */
#ifdef __cplusplus
extern "C" {
#endif /* __cplusplus */

#ifndef CDECL
#  if defined WIN32 || defined _WIN32
#    define CDECL __cdecl
#  else /* defined WIN32 || defined _WIN32 */
#    if defined _M_IX86 || defined __i386__
#      define CDECL __attribute__ ((cdecl)) 
#    else  /* _M_IX86 || __i386__ */
#      define CDECL /* actual only on x86_64 platform */
#    endif /* _M_IX86 || __i386__ */
#  endif /* defined WIN32 || defined _WIN32 */
#endif /* CDECL */

#define JITAPI CDECL
/** @endcond */

/**
 * @brief Generates a new unique method ID.
 *
 * You must use this API to obtain unique and valid method IDs for methods or
 * traces reported to the agent if you don't have your own mechanism to generate
 * unique method IDs.
 *
 * @return a new unique method ID. When out of unique method IDs, this API
 * returns 0, which is not an accepted value.
 */
unsigned int JITAPI iJIT_GetNewMethodID(void);

/**
 * @brief Returns the current mode of the agent.
 *
 * @return iJIT_SAMPLING_ON, indicating that agent is running, or
 * iJIT_NOTHING_RUNNING if no agent is running.
 */
iJIT_IsProfilingActiveFlags JITAPI iJIT_IsProfilingActive(void);

/**
 * @brief Reports infomation about JIT-compiled code to the agent.
 *
 * The reported information is used to attribute samples obtained from any
 * Intel(R) VTune(TM) Amplifier collector. This API needs to be called
 * after JIT compilation and before the first entry into the JIT-compiled
 * code.
 *
 * @param[in] event_type - type of the data sent to the agent
 * @param[in] EventSpecificData - pointer to event-specific data
 * 
 * @returns 1 on success, otherwise 0.
 */
int JITAPI iJIT_NotifyEvent(iJIT_JVM_EVENT event_type, void *EventSpecificData);

#ifdef __cplusplus
}
#endif /* __cplusplus */
/** @endcond */

/** @} jitapi group */

#endif /* __JITPROFILING_H__ */