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+% PT_QRY_ALLOC_DECODER(3)
+
+<!---
+ ! Copyright (c) 2015-2019, 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.
+ !-->
+
+# NAME
+
+pt_qry_alloc_decoder, pt_qry_free_decoder - allocate/free an Intel(R) Processor
+Trace query decoder
+
+
+# SYNOPSIS
+
+| **\#include `<intel-pt.h>`**
+|
+| **struct pt_query_decoder \***
+| **pt_qry_alloc_decoder(const struct pt_config \**config*);**
+|
+| **void pt_qry_free_decoder(struct pt_query_decoder \**decoder*);**
+
+Link with *-lipt*.
+
+
+# DESCRIPTION
+
+A query decoder decodes raw Intel Processor Trace (Intel PT) and provides
+functions for querying the decoder about:
+
+  - whether the next conditional branch was taken (or not taken)
+  - the destination of the next indirect branch
+
+This information can be used to reconstruct the execution flow of the traced
+code.  As long as the flow is clear, follow the flow.  If the flow cannot be
+determined by examining the current instruction, ask the query decoder.
+
+In addition, the query decoder indicates asynchronous events via the return
+value of its query functions and provides an additional function to query for
+such asynchronous events.  See **pt_qry_cond_branch**(3),
+**pt_qry_indirect_branch**(3), and **pt_qry_event**(3).
+
+**pt_qry_alloc_decoder**() allocates a new query decoder and returns a pointer
+to it.  The *config* argument points to a *pt_config* object.  See
+**pt_config**(3).  The *config* argument will not be referenced by the returned
+decoder but the trace buffer defined by the *config* argument's *begin* and
+*end* fields will.
+
+The returned query decoder needs to be synchronized onto the trace stream
+before it can be used.  To synchronize the query decoder, use
+**pt_qry_sync_forward**(3), **pt_qry_sync_backward**(3), or
+**pt_qry_sync_set**(3).
+
+**pt_qry_free_decoder**() frees the Intel PT query decoder pointed to by
+*decoder*.  The *decoder* argument must be NULL or point to a decoder that has
+been allocated by a call to **pt_qry_alloc_decoder**().
+
+
+# RETURN VALUE
+
+**pt_qry_alloc_decoder**() returns a pointer to a *pt_query_decoder* object on
+success or NULL in case of an error.
+
+
+# EXAMPLE
+
+~~~{.c}
+int foo(const struct pt_config *config) {
+	struct pt_query_decoder *decoder;
+	errcode;
+
+	decoder = pt_qry_alloc_decoder(config);
+	if (!decoder)
+		return pte_nomem;
+
+	errcode = bar(decoder);
+
+	pt_qry_free_decoder(decoder);
+	return errcode;
+}
+~~~
+
+
+# SEE ALSO
+
+**pt_config**(3), **pt_qry_sync_forward**(3), **pt_qry_sync_backward**(3),
+**pt_qry_sync_set**(3), **pt_qry_get_offset**(3), **pt_qry_get_sync_offset**(3),
+**pt_qry_get_config**(3), **pt_qry_cond_branch**(3),
+**pt_qry_indirect_branch**(3), **pt_qry_event**(3), **pt_qry_time**(3),
+**pt_qry_core_bus_ratio**(3)