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
122 lines
3.3 KiB
Groff
122 lines
3.3 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_attr.3 3644 2018-10-15 19:55:01Z jkoshy $
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.\"
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.Dd April 8, 2010
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.Dt DWARF_ATTR 3
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.Os
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.Sh NAME
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.Nm dwarf_attr
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.Nd retrieve an attribute descriptor associated with a DWARF debugging information entry
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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_attr
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.Fa "Dwarf_Die die"
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.Fa "Dwarf_Half attr"
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.Fa "Dwarf_Attribute *atp"
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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_attr
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retrieves the attribute descriptor for an attribute associated
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with the DWARF debugging information entry descriptor in
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argument
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.Ar die .
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.Pp
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DWARF attribute descriptors are represented by value of the opaque
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type
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.Vt Dwarf_Attribute ,
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see
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.Xr dwarf 3 .
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.Pp
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Argument
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.Ar attr
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names the desired DWARF attribute.
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Legal values for argument
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.Ar attr
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are those denoted by the
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.Dv DW_AT_*
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constants in the DWARF specification.
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.Pp
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Argument
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.Ar atp
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points to a location into which the returned attribute descriptor
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will be written.
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The returned descriptor may then be passed to the form query functions in the
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.Xr dwarf 3
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API set to access the data associated with the attribute.
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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 will be used to return an error descriptor in case
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of an error.
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.Sh RETURN VALUES
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Function
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.Fn dwarf_attr
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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 the named 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 ERRORS
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Function
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.Fn dwarf_attr
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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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Either of arguments
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.Ar die
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or
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.Ar atp
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was 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 attribute corresponding to the value
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in argument
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.Ar attr .
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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_attrlist 3 ,
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.Xr dwarf_attroffset 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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