1*2de3b87aSKai Wang.\" Copyright (c) 2010 Joseph Koshy 2*2de3b87aSKai Wang.\" All rights reserved. 3*2de3b87aSKai Wang.\" 4*2de3b87aSKai Wang.\" Redistribution and use in source and binary forms, with or without 5*2de3b87aSKai Wang.\" modification, are permitted provided that the following conditions 6*2de3b87aSKai Wang.\" are met: 7*2de3b87aSKai Wang.\" 1. Redistributions of source code must retain the above copyright 8*2de3b87aSKai Wang.\" notice, this list of conditions and the following disclaimer. 9*2de3b87aSKai Wang.\" 2. Redistributions in binary form must reproduce the above copyright 10*2de3b87aSKai Wang.\" notice, this list of conditions and the following disclaimer in the 11*2de3b87aSKai Wang.\" documentation and/or other materials provided with the distribution. 12*2de3b87aSKai Wang.\" 13*2de3b87aSKai Wang.\" THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND 14*2de3b87aSKai Wang.\" ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 15*2de3b87aSKai Wang.\" IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 16*2de3b87aSKai Wang.\" ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE 17*2de3b87aSKai Wang.\" FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 18*2de3b87aSKai Wang.\" DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 19*2de3b87aSKai Wang.\" OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 20*2de3b87aSKai Wang.\" HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 21*2de3b87aSKai Wang.\" LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 22*2de3b87aSKai Wang.\" OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 23*2de3b87aSKai Wang.\" SUCH DAMAGE. 24*2de3b87aSKai Wang.\" 25*2de3b87aSKai Wang.\" $Id: dwarf_formexprloc.3 2073 2011-10-27 03:30:47Z jkoshy $ 26*2de3b87aSKai Wang.\" 27*2de3b87aSKai Wang.Dd July 25, 2010 28*2de3b87aSKai Wang.Os 29*2de3b87aSKai Wang.Dt DWARF_FORMEXPRLOC 3 30*2de3b87aSKai Wang.Sh NAME 31*2de3b87aSKai Wang.Nm dwarf_formexprloc 32*2de3b87aSKai Wang.Nd return information about a location expression 33*2de3b87aSKai Wang.Sh LIBRARY 34*2de3b87aSKai Wang.Lb libdwarf 35*2de3b87aSKai Wang.Sh SYNOPSIS 36*2de3b87aSKai Wang.In libdwarf.h 37*2de3b87aSKai Wang.Ft int 38*2de3b87aSKai Wang.Fo dwarf_formexprloc 39*2de3b87aSKai Wang.Fa "Dwarf_Attribute attr" 40*2de3b87aSKai Wang.Fa "Dwarf_Unsigned *retlen" 41*2de3b87aSKai Wang.Fa "Dwarf_Ptr *retexpr" 42*2de3b87aSKai Wang.Fa "Dwarf_Error *err" 43*2de3b87aSKai Wang.Fc 44*2de3b87aSKai Wang.Sh DESCRIPTION 45*2de3b87aSKai WangFunction 46*2de3b87aSKai Wang.Fn dwarf_formexprloc 47*2de3b87aSKai Wangallows an application to retrieve the length and the bytes of a 48*2de3b87aSKai WangDWARF location expression. 49*2de3b87aSKai Wang.Pp 50*2de3b87aSKai WangArgument 51*2de3b87aSKai Wang.Ar attr 52*2de3b87aSKai Wangshould reference a DWARF attribute of the form 53*2de3b87aSKai Wang.Dv DW_FORM_exprloc . 54*2de3b87aSKai WangArgument 55*2de3b87aSKai Wang.Ar retlen 56*2de3b87aSKai Wangshould point to a location that will be set to the length of the 57*2de3b87aSKai Wanglocation expression. 58*2de3b87aSKai WangArgument 59*2de3b87aSKai Wang.Ar retexpr 60*2de3b87aSKai Wangshould point to a location that will be set to a pointer to the 61*2de3b87aSKai Wangcontent of the location expression itself. 62*2de3b87aSKai Wang.Pp 63*2de3b87aSKai WangIf argument 64*2de3b87aSKai Wang.Ar err 65*2de3b87aSKai Wangis not NULL, it will be used to return an error descriptor in case 66*2de3b87aSKai Wangof an error. 67*2de3b87aSKai Wang.Ss Memory Management 68*2de3b87aSKai WangThe application should not attempt to free the memory 69*2de3b87aSKai Wangarea referenced by the pointer returned in argument 70*2de3b87aSKai Wang.Ar retexpr . 71*2de3b87aSKai Wang.Sh RETURN VALUES 72*2de3b87aSKai WangFunction 73*2de3b87aSKai Wang.Fn dwarf_formexprloc 74*2de3b87aSKai Wangreturns 75*2de3b87aSKai Wang.Dv DW_DLV_OK 76*2de3b87aSKai Wangon success. 77*2de3b87aSKai WangIn case of an error, it returns 78*2de3b87aSKai Wang.Dv DW_DLV_ERROR 79*2de3b87aSKai Wangand sets argument 80*2de3b87aSKai Wang.Ar err . 81*2de3b87aSKai Wang.Sh ERRORS 82*2de3b87aSKai WangFunction 83*2de3b87aSKai Wang.Fn dwarf_formexprloc 84*2de3b87aSKai Wangmay fail with the following errors: 85*2de3b87aSKai Wang.Bl -tag -width ".Bq Er DW_DLE_ATTR_FORM_BAD" 86*2de3b87aSKai Wang.It Bq Er DW_DLE_ARGUMENT 87*2de3b87aSKai WangOne of arguments 88*2de3b87aSKai Wang.Ar attr , 89*2de3b87aSKai Wang.Ar retlen 90*2de3b87aSKai Wangor 91*2de3b87aSKai Wang.Ar retexpr 92*2de3b87aSKai Wangwas NULL. 93*2de3b87aSKai Wang.It Bq Er DW_DLE_ATTR_FORM_BAD 94*2de3b87aSKai WangThe attribute referenced by argument 95*2de3b87aSKai Wang.Ar attr 96*2de3b87aSKai Wangwas not of form 97*2de3b87aSKai Wang.Dv DW_FORM_exprloc . 98*2de3b87aSKai Wang.El 99*2de3b87aSKai Wang.Sh SEE ALSO 100*2de3b87aSKai Wang.Xr dwarf 3 , 101*2de3b87aSKai Wang.Xr dwarf_attr 3 , 102*2de3b87aSKai Wang.Xr dwarf_formblock 3 , 103*2de3b87aSKai Wang.Xr dwarf_formflag 3 , 104*2de3b87aSKai Wang.Xr dwarf_formref 3 , 105*2de3b87aSKai Wang.Xr dwarf_formsdata 3 , 106*2de3b87aSKai Wang.Xr dwarf_formsig8 3 , 107*2de3b87aSKai Wang.Xr dwarf_formstring 3 , 108*2de3b87aSKai Wang.Xr dwarf_formudata 3 , 109*2de3b87aSKai Wang.Xr dwarf_hasattr 3 110