1.\" Copyright (c) 2011 Kai Wang 2.\" All rights reserved. 3.\" 4.\" Redistribution and use in source and binary forms, with or without 5.\" modification, are permitted provided that the following conditions 6.\" are met: 7.\" 1. Redistributions of source code must retain the above copyright 8.\" notice, this list of conditions and the following disclaimer. 9.\" 2. Redistributions in binary form must reproduce the above copyright 10.\" notice, this list of conditions and the following disclaimer in the 11.\" documentation and/or other materials provided with the distribution. 12.\" 13.\" THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND 14.\" ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 15.\" IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 16.\" ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE 17.\" FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 18.\" DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 19.\" OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 20.\" HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 21.\" LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 22.\" OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 23.\" SUCH DAMAGE. 24.\" 25.\" $Id: dwarf_add_AT_location_expr.3 3640 2018-10-14 14:09:13Z jkoshy $ 26.\" 27.Dd September 5, 2011 28.Dt DWARF_ADD_AT_LOCATION_EXPR 3 29.Os 30.Sh NAME 31.Nm dwarf_add_AT_location_expr 32.Nd create an attribute descriptor for a location expression 33.Sh LIBRARY 34.Lb libdwarf 35.Sh SYNOPSIS 36.In libdwarf.h 37.Ft "Dwarf_P_Attribute" 38.Fo dwarf_add_AT_location_expr 39.Fa "Dwarf_P_Debug dbg" 40.Fa "Dwarf_P_Die die" 41.Fa "Dwarf_Half attr" 42.Fa "Dwarf_P_Expr loc_expr" 43.Fa "Dwarf_Error *err" 44.Fc 45.Sh DESCRIPTION 46Function 47.Fn dwarf_add_AT_location_expr 48creates an attribute descriptor for a location expression and attaches 49it to the debugging information entry referenced by argument 50.Ar die . 51.Pp 52Argument 53.Ar dbg 54should reference a DWARF producer instance allocated using 55.Xr dwarf_producer_init 3 56or 57.Xr dwarf_producer_init_b 3 . 58.Pp 59Argument 60.Ar die 61should reference a debugging information entry allocated using 62.Xr dwarf_new_die 3 . 63.Pp 64Argument 65.Ar attr 66specifies the attribute code of the created attribute descriptor. 67.Pp 68Argument 69.Ar loc_expr 70should reference a location expression descriptor allocated using 71.Xr dwarf_new_expr 3 . 72.Pp 73The attribute created by function 74.Fn dwarf_add_AT_location_expr 75will have one of the DWARF forms 76.Dv DW_FORM_block , 77.Dv DW_FORM_block1 , 78.Dv DW_FORM_block2 79or 80.Dv DW_FORM_block4 , 81depending on the size of the byte stream generated by the location 82expression descriptor referenced by argument 83.Ar loc_expr . 84.Pp 85If argument 86.Ar err 87is not NULL, it will be used by to store error information in case of 88an error. 89.Sh RETURN VALUES 90On success, function 91.Fn dwarf_add_AT_location_expr 92returns the created attribute descriptor. 93In case of an error, function 94.Fn dwarf_add_AT_location_expr 95returns 96.Dv DW_DLV_BADADDR 97and sets the argument 98.Ar err . 99.Sh ERRORS 100Function 101.Fn dwarf_add_AT_location_expr 102can fail with: 103.Bl -tag -width ".Bq Er DW_DLE_ARGUMENT" 104.It Bq Er DW_DLE_ARGUMENT 105One of the arguments 106.Ar dbg , 107.Ar die 108or 109.Ar loc_expr 110was NULL. 111.It Bq Er DW_DLE_MEMORY 112An out of memory condition was encountered during the execution of the 113function. 114.El 115.Sh SEE ALSO 116.Xr dwarf 3 , 117.Xr dwarf_new_die 3 , 118.Xr dwarf_new_expr 3 , 119.Xr dwarf_producer_init 3 , 120.Xr dwarf_producer_init_b 3 121