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/*
* Copyright (c) 2014-2025, Intel Corporation
* SPDX-License-Identifier: BSD-3-Clause
*
* 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 PT_QUERY_DECODER_H
#define PT_QUERY_DECODER_H
#include "pt_event_decoder.h"
#include "pt_tnt_cache.h"
#include "intel-pt.h"
/* An Intel PT query decoder. */
struct pt_query_decoder {
/* The Intel PT event decoder. */
struct pt_event_decoder evdec;
/* The configuration flags.
*
* Those are our flags set by the user. In @evdec.config.flags, we set
* the flags we need for the event decoder.
*/
struct pt_conf_flags flags;
/* The cached tnt indicators. */
struct pt_tnt_cache tnt;
/* The time at the last query (before reading ahead). */
struct pt_time last_time;
/* The current event to be processed.
*
* This will be valid as long as there are events available, i.e. until
* @status is not negative.
*
* The decoder starts by reading the first event after synchronizing
* onto the trace stream.
*
* When it is done processing an event, it fetches the next event for
* the next iteration.
*/
struct pt_event event;
/* The last status of the event decoder.
*
* It will be zero most of the time. Since we fetch new events at the
* end of an iteration, we need to store the status until the next
* pt_qry_*() call.
*/
int status;
};
/* Initialize the query decoder.
*
* Returns zero on success, a negative error code otherwise.
*/
extern int pt_qry_decoder_init(struct pt_query_decoder *,
const struct pt_config *);
/* Finalize the query decoder. */
extern void pt_qry_decoder_fini(struct pt_query_decoder *);
static inline const struct pt_config *
pt_qry_config(const struct pt_query_decoder *decoder)
{
if (!decoder)
return NULL;
return pt_evt_config(&decoder->evdec);
}
static inline const uint8_t *pt_qry_pos(const struct pt_query_decoder *decoder)
{
if (!decoder)
return NULL;
return pt_evt_pos(&decoder->evdec);
}
#endif /* PT_QUERY_DECODER_H */
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