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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_get_loclist_entry.3 2071 2011-10-27 03:20:00Z jkoshy $
.\"
.Dd July 6, 2011
.Os
.Dt DWARF_GET_LOCLIST_ENTRY 3
.Sh NAME
.Nm dwarf_get_loclist_entry
.Nd retrieve DWARF location list entry
.Sh LIBRARY
.Lb libdwarf
.Sh SYNOPSIS
.In libdwarf.h
.Ft int
.Fo dwarf_get_loclist_entry
.Fa "Dwarf_Debug dbg"
.Fa "Dwarf_Unsigned offset"
.Fa "Dwarf_Addr *hipc"
.Fa "Dwarf_Addr *lopc"
.Fa "Dwarf_Ptr *data"
.Fa "Dwarf_Unsigned *entry_len"
.Fa "Dwarf_Unsigned *next_entry"
.Fa "Dwarf_Error *err"
.Fc
.Sh DESCRIPTION
Function
.Fn dwarf_get_loclist_entry
retrieves a location list entry from the DWARF section
.Dq ".debug_loc" .
.Pp
Argument
.Ar dbg
should reference a DWARF debug context allocated using
.Xr dwarf_init 3 .
.Pp
Argument
.Ar offset
is an offset, relative to the
.Dq ".debug_loc"
section, to the start of the desired location list entry.
.Pp
Argument
.Ar hipc
should point to a location which will hold the offset, relative to the
base address of the location list entry, of the highest program
counter value for the entry.
.Pp
Argument
.Ar lowpc
should point to a location which will hold the offset, relative to the
base address of the location list entry, of the lowest program counter
value for the entry.
.Pp
Argument
.Ar data
should point to a location which will be set to a pointer to the location
list data.
.Pp
Argument
.Ar entry_len
should point to a location which will hold the length in bytes of the
location list data returned in argument
.Ar data .
.Pp
Argument
.Ar next_entry
should point to a location which will hold the offset of the next
location list entry.
.Pp
If argument
.Ar err
is not NULL, it will be used to store error information in case
of an error.
.Sh RETURN VALUES
Function
.Fn dwarf_get_loclist_entry
returns
.Dv DW_DLV_OK
when it succeeds.
It returns
.Dv DW_DLV_NO_ENTRY
if there is no location list at the specified offset
.Ar offset .
In case of an error, it returns
.Dv DW_DLV_ERROR
and sets the argument
.Ar err .
.Sh ERRORS
Function
.Fn dwarf_get_loclist_entry
can fail with:
.Bl -tag -width ".Bq Er DW_DLE_NO_ENTRY"
.It Bq Er DW_DLE_ARGUMENT
One of the arguments
.Ar dbg ,
.Ar hipc ,
.Ar lopc ,
.Ar data ,
.Ar entry_len
or
.Ar next_entry
was NULL.
.It Bq Er DW_DLE_NO_ENTRY
There is no location list at the specified offset
.Ar offset .
.El
.Sh EXAMPLE
To iterate through all the location list entries in the
.Dq ".debug_loc"
section, use:
.Bd -literal -offset indent
Dwarf_Debug dbg;
Dwarf_Unsigned off, len, next;
Dwarf_Addr hipc, lopc;
Dwarf_Ptr data;
Dwarf_Error de;
int ret;
off = 0;
while ((ret = dwarf_get_loclist_entry(dbg, off, &hipc, &lopc, &data,
&len, &next, &de)) == DW_DLV_OK) {
/* ... use loclist entry ... */
off = next;
}
if (ret == DW_DLV_ERROR)
warnx("dwarf_get_loclist_entry failed: %s", dwarf_errmsg(de));
.Ed
.Sh SEE ALSO
.Xr dwarf 3 ,
.Xr dwarf_loclist 3 ,
.Xr dwarf_loclist_n 3 ,
.Xr dwarf_loclist_from_expr 3 ,
.Xr dwarf_loclist_from_expr_a 3
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