123 lines
3.5 KiB
Groff
123 lines
3.5 KiB
Groff
.\" Copyright (c) 2011 Kai Wang
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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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.\" HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
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.\" LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
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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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.\" $Id: dwarf_add_AT_dataref.3 2072 2011-10-27 03:26:49Z jkoshy $
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.\"
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.Dd September 4, 2011
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.Os
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.Dt DWARF_ADD_AT_DATAREF 3
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.Sh NAME
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.Nm dwarf_add_AT_dataref
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.Nd create an attribute descriptor for a relocatable address
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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 "Dwarf_P_Attribute"
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.Fo dwarf_add_AT_dataref
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.Fa "Dwarf_P_Debug dbg"
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.Fa "Dwarf_P_Die die"
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.Fa "Dwarf_Half attr"
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.Fa "Dwarf_Unsigned pc_value"
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.Fa "Dwarf_Unsigned sym_index"
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.Fa "Dwarf_Error *err"
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.Fc
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.Sh DESCRIPTION
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Function
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.Fn dwarf_add_AT_dataref
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creates an attribute descriptor for a relocatable address and attaches
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it to the debugging information entry referenced by argument
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.Ar die .
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.Pp
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If flag
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.Dv DW_DLC_SIZE_64
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is set, the address value will be 8 bytes in size and of the DWARF form
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.Dv DW_FORM_data8 .
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Otherwise, the address value will be 4 bytes in size and of the DWARF form
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.Dv DW_FORM_data4 .
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.Pp
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Argument
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.Ar dbg
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should reference a DWARF producer instance allocated using
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.Xr dwarf_producer_init 3
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or
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.Xr dwarf_producer_init_b 3 .
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.Pp
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Argument
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.Ar die
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should reference a debugging information entry allocated using
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.Xr dwarf_new_die 3 .
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.Pp
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Argument
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.Ar attr
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specifies the attribute code of the created attribute descriptor.
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.Pp
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Argument
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.Ar pc_value
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specifies the value of the relocatable address.
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.Pp
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Argument
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.Ar sym_index
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specifies the ELF symbol index of the symbol to be used for
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relocation.
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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 store error information in case
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of an error.
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.Sh RETURN VALUES
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On success, function
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.Fn dwarf_add_AT_dataref
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returns the created attribute descriptor.
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In case of an error, function
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.Fn dwarf_add_AT_dataref
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returns
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.Dv DW_DLV_BADADDR
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and sets the argument
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.Ar err .
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.Sh ERRORS
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Function
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.Fn dwarf_add_AT_dataref
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can fail with:
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.Bl -tag -width ".Bq Er DW_DLE_ARGUMENT"
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.It Bq Er DW_DLE_ARGUMENT
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Either of the arguments
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.Ar dbg
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or
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.Ar die
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was NULL.
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.It Bq Er DW_DLE_MEMORY
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An out of memory condition was encountered during the execution of the
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function.
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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_add_AT_reference 3 ,
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.Xr dwarf_add_AT_ref_address 3 ,
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.Xr dwarf_add_AT_signed_const 3 ,
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.Xr dwarf_add_AT_unsigned_const 3 ,
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.Xr dwarf_new_die 3 ,
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.Xr dwarf_producer_init 3 ,
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.Xr dwarf_producer_init_b 3
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