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.\" Copyright (c) 2011 Kai Wang
.\" All rights reserved.
.\"
.\" Redistribution and use in source and binary forms, with or without
.\" modification, are permitted provided that the following conditions
.\" are met:
.\" 1. Redistributions of source code must retain the above copyright
.\" notice, this list of conditions and the following disclaimer.
.\" 2. 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.
.\"
.\" THIS SOFTWARE IS PROVIDED BY THE AUTHOR 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 AUTHOR 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.
.\"
.\" $Id: dwarf_get_fde_instr_bytes.3 2071 2011-10-27 03:20:00Z jkoshy $
.\"
.Dd May 23, 2011
.Os
.Dt DWARF_GET_FDE_INSTR_BYTES 3
.Sh NAME
.Nm dwarf_get_fde_instr_bytes
.Nd retrieve instructions from FDE descritpor
.Sh LIBRARY
.Lb libdwarf
.Sh SYNOPSIS
.In libdwarf.h
.Ft int
.Fo dwarf_get_fde_instr_bytes
.Fa "Dwarf_Fde fde"
.Fa "Dwarf_Ptr *ret_inst"
.Fa "Dwarf_Unsigned *ret_len"
.Fa "Dwarf_Error *error"
.Fc
.Sh DESCRIPTION
Function
.Fn dwarf_get_fde_instr_bytes
retrieves instruction bytes from a given FDE descriptor.
.Pp
Argument
.Ar fde
should reference a valid DWARF FDE descriptor.
.Pp
Argument
.Ar ret_inst
should point to a location that will be set to a pointer
to an array of bytes containing the instructions of the
FDE descriptor.
.Pp
Argument
.Ar ret_len
should point to a location that will hold the length in
bytes of the instructions returned in argument
.Ar ret_inst .
.Pp
If argument
.Ar err
is not NULL, it will be used to store error information in case of an
error.
.Pp
Applications can use the function
.Xr dwarf_expand_frame_instructions 3
to parse and expand the returned instruction bytes into an array of
.Vt Dwarf_Frame_Op
descriptors.
.Sh RETURN VALUES
Function
.Fn dwarf_get_fde_instr_bytes
returns
.Dv DW_DLV_OK
when it succeeds.
In case of an error, it returns
.Dv DW_DLV_ERROR
and sets the argument
.Ar err .
.Sh ERRORS
Function
.Fn dwarf_get_fde_instr_bytes
can fail with:
.Bl -tag -width ".Bq Er DW_DLE_ARGUMENT"
.It Bq Er DW_DLE_ARGUMENT
One of the arguments
.Ar fde ,
.Ar ret_inst
or
.Ar ret_len
was NULL.
.El
.Sh SEE ALSO
.Xr dwarf 3 ,
.Xr dwarf_expand_frame_instructions 3 ,
.Xr dwarf_get_cie_info 3 ,
.Xr dwarf_get_cie_index 3 ,
.Xr dwarf_get_cie_of_fde ,
.Xr dwarf_get_fde_at_pc 3 ,
.Xr dwarf_get_fde_info_for_all_regs 3 ,
.Xr dwarf_get_fde_info_for_all_regs3 3 ,
.Xr dwarf_get_fde_info_for_cfa_reg3 3 ,
.Xr dwarf_get_fde_info_for_reg 3 ,
.Xr dwarf_get_fde_info_for_reg3 3 ,
.Xr dwarf_get_fde_list 3 ,
.Xr dwarf_get_fde_list_eh 3 ,
.Xr dwarf_get_fde_n 3 ,
.Xr dwarf_get_fde_range 3
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