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.\" Copyright (c) 2011 Kai Wang
.\" All rights reserved.
.\"
.\" Redistribution and use in source and binary forms, with or without
.\" modification, are permitted provided that the following conditions
.\" are met:
.\" 1. Redistributions of source code must retain the above copyright
.\" notice, this list of conditions and the following disclaimer.
.\" 2. Redistributions in binary form must reproduce the above copyright
.\" notice, this list of conditions and the following disclaimer in the
.\" documentation and/or other materials provided with the distribution.
.\"
.\" THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
.\" ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
.\" IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
.\" ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
.\" FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
.\" DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
.\" OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
.\" HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
.\" LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
.\" OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
.\" SUCH DAMAGE.
.\"
.\" $Id: dwarf_add_AT_location_expr.3 2072 2011-10-27 03:26:49Z jkoshy $
.\"
.Dd September 5, 2011
.Os
.Dt DWARF_ADD_AT_LOCATION_EXPR 3
.Sh NAME
.Nm dwarf_add_AT_location_expr
.Nd create an attribute descriptor for a location expression
.Sh LIBRARY
.Lb libdwarf
.Sh SYNOPSIS
.In libdwarf.h
.Ft "Dwarf_P_Attribute"
.Fo dwarf_add_AT_location_expr
.Fa "Dwarf_P_Debug dbg"
.Fa "Dwarf_P_Die die"
.Fa "Dwarf_Half attr"
.Fa "Dwarf_P_Expr loc_expr"
.Fa "Dwarf_Error *err"
.Fc
.Sh DESCRIPTION
Function
.Fn dwarf_add_AT_location_expr
creates an attribute descriptor for a location expression and attaches
it to the debugging information entry referenced by argument
.Ar die .
.Pp
Argument
.Ar dbg
should reference a DWARF producer instance allocated using
.Xr dwarf_producer_init 3
or
.Xr dwarf_producer_init_b 3 .
.Pp
Argument
.Ar die
should reference a debugging information entry allocated using
.Xr dwarf_new_die 3 .
.Pp
Argument
.Ar attr
specifies the attribute code of the created attribute descriptor.
.Pp
Argument
.Ar loc_expr
should reference a location expression descriptor allocated using
.Xr dwarf_new_expr 3 .
.Pp
The attribute created by function
.Fn dwarf_add_AT_location_expr
will have one of the DWARF forms
.Dv DW_FORM_block ,
.Dv DW_FORM_block1 ,
.Dv DW_FORM_block2
or
.Dv DW_FORM_block4 ,
depending on the size of the byte stream generated by the location
expression descriptor referenced by argument
.Ar loc_expr .
.Pp
If argument
.Ar err
is not NULL, it will be used by to store error information in case of
an error.
.Sh RETURN VALUES
On success, function
.Fn dwarf_add_AT_location_expr
returns the created attribute descriptor.
In case of an error, function
.Fn dwarf_add_AT_location_expr
returns
.Dv DW_DLV_BADADDR
and sets the argument
.Ar err .
.Sh ERRORS
Function
.Fn dwarf_add_AT_location_expr
can fail with:
.Bl -tag -width ".Bq Er DW_DLE_ARGUMENT"
.It Bq Er DW_DLE_ARGUMENT
One of the arguments
.Ar dbg ,
.Ar die
or
.Ar loc_expr
was NULL.
.It Bq Er DW_DLE_MEMORY
An out of memory condition was encountered during the execution of the
function.
.El
.Sh SEE ALSO
.Xr dwarf 3 ,
.Xr dwarf_new_die 3 ,
.Xr dwarf_new_expr 3 ,
.Xr dwarf_producer_init 3 ,
.Xr dwarf_producer_init_b 3
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