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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_expr_addr.3 2072 2011-10-27 03:26:49Z jkoshy $
.\"
.Dd September 9, 2011
.Os
.Dt DWARF_ADD_EXPR_ADDR 3
.Sh NAME
.Nm dwarf_add_expr_addr ,
.Nm dwarf_add_expr_addr_b
.Nd add a DW_OP_addr location expression
.Sh LIBRARY
.Lb libdwarf
.Sh SYNOPSIS
.In libdwarf.h
.Ft "Dwarf_Unsigned"
.Fo dwarf_add_expr_addr
.Fa "Dwarf_P_Expr expr"
.Fa "Dwarf_Unsigned address"
.Fa "Dwarf_Signed sym_index"
.Fa "Dwarf_Error *err"
.Fc
.Ft "Dwarf_Unsigned"
.Fo dwarf_add_expr_addr_b
.Fa "Dwarf_P_Expr expr"
.Fa "Dwarf_Unsigned address"
.Fa "Dwarf_Unsigned sym_index"
.Fa "Dwarf_Error *err"
.Fc
.Sh DESCRIPTION
Function
.Fn dwarf_add_expr_addr_b
adds a
.Dv DW_OP_addr
location expression to the location expression descriptor referenced
by argument
.Ar expr .
.Pp
Argument
.Ar expr
should reference a location expression descriptor allocated using
the function
.Xr dwarf_new_expr 3 .
.Pp
Argument
.Ar address
specifies the operand, a relocatable address value.
.Pp
Argument
.Ar sym_index
specifies the ELF symbol index of the symbol to be used for
relocation.
.Pp
If argument
.Ar err
is not NULL, it will be used to store error information in case
of an error.
.Pp
Function
.Fn dwarf_add_expr_addr
is deprecated.
It is similar to function
.Fn dwarf_add_expr_addr_b
except that it cannot handle all possible symbol index values.
.Sh RETURN VALUES
On success, these functions return the size in bytes of the location
expression byte stream generated.
In case of an error, these functions return
.Dv DW_DLV_NOCOUNT
and set the argument
.Ar err .
.Sh ERRORS
These functions can fail with:
.Bl -tag -width ".Bq Er DW_DLE_ARGUMENT"
.It Bq Er DW_DLE_ARGUMENT
Argument
.Ar 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_add_AT_location_expr 3 ,
.Xr dwarf_add_expr_gen 3 ,
.Xr dwarf_expr_current_offset 3 ,
.Xr dwarf_expr_into_block 3 ,
.Xr dwarf_new_expr 3
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