.\" Copyright (c) 2011 Kai Wang
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.\" $Id: dwarf_get_fde_instr_bytes.3 3644 2018-10-15 19:55:01Z jkoshy $
.\"
.Dd May 23, 2011
.Dt DWARF_GET_FDE_INSTR_BYTES 3
.Os
.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_index 3 ,
.Xr dwarf_get_cie_info 3 ,
.Xr dwarf_get_cie_of_fde 3 ,
.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