2014-01-15 08:43:20 +00:00
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.\" Copyright (c) 2010 Joseph Koshy
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.\" All rights reserved.
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.\"
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.\" Redistribution and use in source and binary forms, with or without
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.\" modification, are permitted provided that the following conditions
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.\" are met:
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.\" 1. Redistributions of source code must retain the above copyright
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.\" notice, this list of conditions and the following disclaimer.
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.\" 2. Redistributions in binary form must reproduce the above copyright
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.\" notice, this list of conditions and the following disclaimer in the
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.\" documentation and/or other materials provided with the distribution.
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.\"
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.\" THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
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.\" ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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.\" IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
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.\" ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
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.\" FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
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.\" DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
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.\" OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
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.\" OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
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.\" SUCH DAMAGE.
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.\"
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2019-01-10 14:18:11 +00:00
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.\" $Id: dwarf_formudata.3 3640 2018-10-14 14:09:13Z jkoshy $
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2014-01-15 08:43:20 +00:00
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.\"
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.Dd June 21, 2010
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.Dt DWARF_FORMUDATA 3
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2019-01-10 14:18:11 +00:00
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.Os
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2014-01-15 08:43:20 +00:00
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.Sh NAME
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.Nm dwarf_formudata ,
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.Nm dwarf_formsdata
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.Nd return the value of a CONSTANT class attribute
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.Sh LIBRARY
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.Lb libdwarf
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.Sh SYNOPSIS
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.In libdwarf.h
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.Ft int
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.Fo dwarf_formudata
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.Fa "Dwarf_Attribute attr"
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.Fa "Dwarf_Unsigned *ret"
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.Fa "Dwarf_Error *err"
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.Fc
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.Ft int
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.Fo dwarf_formsdata
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.Fa "Dwarf_Attribute attr"
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.Fa "Dwarf_Signed *ret"
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.Fa "Dwarf_Error *err"
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.Fc
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.Sh DESCRIPTION
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These functions return the value associated with a DWARF attribute
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describing a constant.
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.Pp
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Function
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.Fn dwarf_formudata
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sets the location pointed to by argument
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.Ar ret
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to the value of the attribute referenced by argument
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.Ar attr ,
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treating the value as an unsigned quantity.
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Argument
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.Ar attr
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must have one of the following forms:
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.Dv DW_FORM_data1 ,
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.Dv DW_FORM_data2 ,
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.Dv DW_FORM_data4 ,
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.Dv DW_FORM_data8
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and
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.Dv DW_FORM_udata .
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.Pp
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Function
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.Fn dwarf_formsdata
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sets the location pointed to by argument
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.Ar ret
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to the value of the attribute referenced by argument
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.Ar attr ,
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appropriately sign extended.
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Argument
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.Ar attr
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must have one of the following forms:
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.Dv DW_FORM_data1 ,
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.Dv DW_FORM_data2 ,
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.Dv DW_FORM_data4 ,
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.Dv DW_FORM_data8
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and
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.Dv DW_FORM_sdata .
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.Pp
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If argument
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.Ar err
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is not NULL, it will be used to return an error descriptor in case
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2015-05-14 17:48:57 +00:00
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of an error.
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2014-01-15 08:43:20 +00:00
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.Sh RETURN VALUES
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These functions return
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.Dv DW_DLV_OK
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on success.
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In case of an error, they return
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.Dv DW_DLV_ERROR
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and set argument
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.Ar err .
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.Sh ERRORS
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These functions may fail with the following errors:
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.Bl -tag -width ".Bq Er DW_DLE_ATTR_FORM_BAD"
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.It Bq Er DW_DLE_ARGUMENT
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Either of arguments
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.Ar attr
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or
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.Ar ret
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was NULL.
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.It Bq Er DW_DLE_ATTR_FORM_BAD
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The attribute referenced by argument
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.Ar attr
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was not of a permitted kind.
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.El
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.Sh SEE ALSO
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.Xr dwarf 3 ,
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.Xr dwarf_attr 3 ,
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.Xr dwarf_formblock 3 ,
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.Xr dwarf_formflag 3 ,
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.Xr dwarf_formref 3 ,
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.Xr dwarf_formsig8 3 ,
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.Xr dwarf_formstring 3 ,
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.Xr dwarf_hasattr 3
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