1.\" $NetBSD: dwarf_add_AT_dataref.3,v 1.6 2024/03/03 17:37:30 christos Exp $ 2.\" 3.\" Copyright (c) 2011 Kai Wang 4.\" All rights reserved. 5.\" 6.\" Redistribution and use in source and binary forms, with or without 7.\" modification, are permitted provided that the following conditions 8.\" are met: 9.\" 1. Redistributions of source code must retain the above copyright 10.\" notice, this list of conditions and the following disclaimer. 11.\" 2. Redistributions in binary form must reproduce the above copyright 12.\" notice, this list of conditions and the following disclaimer in the 13.\" documentation and/or other materials provided with the distribution. 14.\" 15.\" THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND 16.\" ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 17.\" IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 18.\" ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE 19.\" FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 20.\" DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 21.\" OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 22.\" HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 23.\" LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 24.\" OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 25.\" SUCH DAMAGE. 26.\" 27.\" Id: dwarf_add_AT_dataref.3 3961 2022-03-12 15:13:22Z jkoshy 28.\" 29.Dd September 4, 2011 30.Dt DWARF_ADD_AT_DATAREF 3 31.Os 32.Sh NAME 33.Nm dwarf_add_AT_dataref 34.Nd create an attribute descriptor for a relocatable address 35.Sh LIBRARY 36.Lb libdwarf 37.Sh SYNOPSIS 38.In libdwarf.h 39.Ft "Dwarf_P_Attribute" 40.Fo dwarf_add_AT_dataref 41.Fa "Dwarf_P_Debug dbg" 42.Fa "Dwarf_P_Die die" 43.Fa "Dwarf_Half attr" 44.Fa "Dwarf_Unsigned pc_value" 45.Fa "Dwarf_Unsigned sym_index" 46.Fa "Dwarf_Error *err" 47.Fc 48.Sh DESCRIPTION 49Function 50.Fn dwarf_add_AT_dataref 51creates an attribute descriptor for a relocatable address and attaches 52it to the debugging information entry referenced by argument 53.Fa die . 54.Pp 55If flag 56.Dv DW_DLC_SIZE_64 57is set, the address value will be 8 bytes in size and of the DWARF form 58.Dv DW_FORM_data8 . 59Otherwise, the address value will be 4 bytes in size and of the DWARF form 60.Dv DW_FORM_data4 . 61.Pp 62Argument 63.Fa dbg 64should reference a DWARF producer instance allocated using 65.Xr dwarf_producer_init 3 66or 67.Xr dwarf_producer_init_b 3 . 68.Pp 69Argument 70.Fa die 71should reference a debugging information entry allocated using 72.Xr dwarf_new_die 3 . 73.Pp 74Argument 75.Fa attr 76specifies the attribute code of the created attribute descriptor. 77.Pp 78Argument 79.Fa pc_value 80specifies the value of the relocatable address. 81.Pp 82Argument 83.Fa sym_index 84specifies the ELF symbol index of the symbol to be used for 85relocation. 86.Pp 87If argument 88.Fa err 89is not 90.Dv NULL , 91it will be used to store error information in case 92of an error. 93.Sh RETURN VALUES 94On success, function 95.Fn dwarf_add_AT_dataref 96returns the created attribute descriptor. 97In case of an error, function 98.Fn dwarf_add_AT_dataref 99returns 100.Dv DW_DLV_BADADDR 101and sets the argument 102.Fa err . 103.Sh ERRORS 104Function 105.Fn dwarf_add_AT_dataref 106can fail with: 107.Bl -tag -width ".Bq Er DW_DLE_ARGUMENT" 108.It Bq Er DW_DLE_ARGUMENT 109Either of the arguments 110.Fa dbg 111or 112.Fa die 113was 114.Dv NULL . 115.It Bq Er DW_DLE_MEMORY 116An out of memory condition was encountered during the execution of the 117function. 118.El 119.Sh SEE ALSO 120.Xr dwarf 3 , 121.Xr dwarf_add_AT_ref_address 3 , 122.Xr dwarf_add_AT_reference 3 , 123.Xr dwarf_add_AT_signed_const 3 , 124.Xr dwarf_add_AT_unsigned_const 3 , 125.Xr dwarf_new_die 3 , 126.Xr dwarf_producer_init 3 , 127.Xr dwarf_producer_init_b 3 128