ae500c1ff8
Highlights: - Make sure that only TLS sections are sorted into TLS segment. - Fixed multiple errors in "Section to Segment mapping". - Man page updates - ar improvements - elfcopy: avoid filter_reloc uninitialized variable for rela - elfcopy: avoid stripping relocations from static binaries - readelf: avoid printing directory in front of absolute path - readelf: add NT_FREEBSD_FEATURE_CTL FreeBSD note type - test improvements NOTES: Some of these changes originated in FreeBSD and simply reduce diffs between contrib and vendor. ELF Tool Chain ar is not (currently) used in FreeBSD, and there are improvements in both FreeBSD and ELF Tool Chain ar that are not in the other. Sponsored by: The FreeBSD Foundation
148 lines
4.3 KiB
Groff
148 lines
4.3 KiB
Groff
.\" Copyright (c) 2010 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_attrlist.3 3644 2018-10-15 19:55:01Z jkoshy $
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.\"
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.Dd November 9, 2011
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.Dt DWARF_ATTRLIST 3
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.Os
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.Sh NAME
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.Nm dwarf_attrlist
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.Nd retrieve DWARF attribute descriptors
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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_attrlist
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.Fa "Dwarf_Die die"
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.Fa "Dwarf_Attribute **attrbuf"
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.Fa "Dwarf_Signed *attrcount"
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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_attrlist
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retrieves the DWARF attribute descriptors associated with a
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debugging information entry descriptor in argument
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.Ar die .
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The descriptors are returned as an array of values of the opaque type
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.Vt Dwarf_Attribute .
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The data associated with each returned attribute descriptor may be
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queried using the form query functions in the
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.Xr dwarf 3
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API set.
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.Pp
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Argument
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.Ar attrbuf
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points to a location that will hold a pointer to the returned
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array of DWARF attribute descriptors.
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Argument
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.Ar attrcount
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points to a location that will hold the number of descriptors in
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the returned array.
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.Pp
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If argument
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.Ar err
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is non-NULL, it is used to return an error descriptor in case of an
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error.
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.Ss Memory Management
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In the current implementation, the memory allocated for each DWARF
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attribute descriptor and for the returned array of descriptors is
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managed by the library and the application does not need to explicitly
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free the returned pointers.
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However, for compatibility with other implementations of the
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.Xr dwarf 3
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API, the application is permitted to pass the pointers returned by to
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the
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.Fn dwarf_dealloc
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function.
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.Sh RETURN VALUES
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Function
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.Fn dwarf_attrlist
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returns
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.Dv DW_DLV_OK
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on success.
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.Pp
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If the debugging information entry descriptor denoted by argument
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.Ar die
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does not contain any attribute, the function returns
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.Dv DW_DLV_NO_ENTRY
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and sets argument
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.Ar err .
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For other errors, it returns
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.Dv DW_DLV_ERROR
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and sets argument
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.Ar err .
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.Sh EXAMPLES
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To retrieve the attribute list for a DWARF debugging information
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entry use:
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.Bd -literal -offset indent
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Dwarf_Die dw_die;
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Dwarf_Error dw_e;
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Dwarf_Unsigned dw_count;
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Dwarf_Attribute *dw_attributes;
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int error, i;
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\&... variable dw_die contains a reference to the DIE of interest ...
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/* Retrieve the attribute list from the DIE. */
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if ((error = dwarf_attrlist(dw_die, &dw_attributes, &dw_count,
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&dw_e)) != DW_DLV_OK)
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errx(EXIT_FAILURE, "dwarf_attrlist: %s", dwarf_errmsg(dw_e));
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/* Process the attribute list. */
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for (i = 0; i < dw_count; ++i) {
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/* Use the returned pointers in dw_attributes[i] here. */
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}
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.Ed
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.Sh ERRORS
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Function
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.Fn dwarf_diename
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can fail with the following errors:
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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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Arguments
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.Ar die ,
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.Ar attrbuf ,
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or
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.Ar attrcount
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were NULL.
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.It Bq Er DW_DLE_NO_ENTRY
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Argument
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.Ar die
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had no attributes.
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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_attr 3 ,
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.Xr dwarf_dealloc 3 ,
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.Xr dwarf_hasattr 3 ,
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.Xr dwarf_hasform 3 ,
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.Xr dwarf_whatattr 3 ,
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.Xr dwarf_whatform 3
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