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% PT_INSN_ALLOC_DECODER(3)
<!---
! Copyright (c) 2015-2016, 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_insn_alloc_decoder, pt_insn_free_decoder - allocate/free an Intel(R)
Processor Trace instruction flow decoder
# SYNOPSIS
| **\#include `<intel-pt.h>`**
|
| **struct pt_insn_decoder \***
| **pt_insn_alloc_decoder(const struct pt_config \**config*);**
|
| **void pt_insn_free_decoder(struct pt_insn_decoder \**decoder*);**
Link with *-lipt*.
# DESCRIPTION
An instruction flow decoder decodes raw Intel Processor Trace (Intel PT) into a
sequence of instructions described by the *pt_insn* structure. See
**pt_insn_next**(3).
**pt_insn_alloc_decoder**() allocates a new instruction flow 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 instruction flow decoder needs to be synchronized onto the trace
stream before it can be used. To synchronize the instruction flow decoder, use
**pt_insn_sync_forward**(3), **pt_insn_sync_backward**(3), or
**pt_insn_sync_set**(3).
**pt_insn_free_decoder**() frees the Intel PT instruction flow 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_insn_alloc_decoder**().
# RETURN VALUE
**pt_insn_alloc_decoder**() returns a pointer to a *pt_insn_decoder* object on
success or NULL in case of an error.
# EXAMPLE
~~~{.c}
int foo(const struct pt_config *config) {
struct pt_insn_decoder *decoder;
errcode;
decoder = pt_insn_alloc_decoder(config);
if (!decoder)
return pte_nomem;
errcode = bar(decoder);
pt_insn_free_decoder(decoder);
return errcode;
}
~~~
# SEE ALSO
**pt_config**(3), **pt_insn_sync_forward**(3), **pt_insn_sync_backward**(3),
**pt_insn_sync_set**(3), **pt_insn_get_offset**(3), **pt_insn_get_sync_offset**(3),
**pt_insn_get_image**(3), **pt_insn_set_image**(3), **pt_insn_get_config**(3),
**pt_insn_time**(3), **pt_insn_core_bus_ratio**(3), **pt_insn_next**(3)
|
