mirror of
https://github.com/freebsd/freebsd-src
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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
180 lines
4.9 KiB
Groff
180 lines
4.9 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_get_abbrev.3 3644 2018-10-15 19:55:01Z jkoshy $
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.\"
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.Dd March 27, 2011
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.Dt DWARF_GET_ABBREV 3
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.Os
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.Sh NAME
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.Nm dwarf_get_abbrev
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.Nd retrieve abbreviation information
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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_get_abbrev
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.Fa "Dwarf_Debug dbg"
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.Fa "Dwarf_Unsigned offset"
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.Fa "Dwarf_Abbrev *ret_abbrev"
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.Fa "Dwarf_Unsigned *length"
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.Fa "Dwarf_Unsigned *attr_count"
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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_get_abbrev
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retrieves information about an abbreviation from the DWARF abbreviations
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section,
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.Dq ".debug_abbrev" .
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Abbreviation information is returned using an opaque descriptor
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of type
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.Vt Dwarf_Abbrev .
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The returned
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.Vt Dwarf_Abbrev
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descriptor may then be passed to the other abbreviation related APIs
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in the DWARF(3) API to retrieve specific information about the
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abbreviation.
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.Pp
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Argument
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.Ar dbg
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should reference a DWARF debug context allocated using
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.Xr dwarf_init 3 .
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.Pp
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Argument
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.Ar offset
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should be an offset, relative to the
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.Dq ".debug_abbrev"
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section, to the start of an abbreviation entry.
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.Pp
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Argument
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.Ar ret_abbrev
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should point to a location that will hold a pointer to the
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returned
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.Vt Dwarf_Abbrev
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descriptor.
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.Pp
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Argument
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.Ar length
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should point to a location that will hold the number of bytes used
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by the abbrevation in the DWARF
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.Dq ".debug_abbrev"
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section.
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.Pp
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Argument
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.Ar attr_count
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should point to a location that will hold the number of
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attributes in the abbrevation.
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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 of an
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error.
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.Ss Memory Management
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The memory area used for the
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.Vt Dwarf_Abbrev
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descriptor returned in argument
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.Ar ret_abbrev
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is allocated by the
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.Lb libdwarf .
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Application code should use function
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.Fn dwarf_dealloc
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with the allocation type
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.Dv DW_DLA_ABBREV
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to free the memory area when the
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.Vt Dwarf_Abbrev
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descriptor is no longer needed.
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.Ss Application Programming Notes
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The last abbreviation entry in a standard DWARF abbreviation section
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will have a special length value of 1.
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.Sh RETURN VALUES
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Function
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.Fn dwarf_get_abbrev
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returns
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.Dv DW_DLV_OK
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when it succeeds.
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It returns
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.Dv DW_DLV_NO_ENTRY
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if there is no abbreviation information at offset
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.Ar offset .
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In case of an error, it returns
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.Dv DW_DLV_ERROR
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and sets the argument
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.Ar err .
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.Sh EXAMPLES
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To loop through all the abbreviation information associated with
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a DWARF debug context, use:
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.Bd -literal -offset indent
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Dwarf_Debug dbg;
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Dwarf_Abbrev ab;
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Dwarf_Off aboff;
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Dwarf_Unsigned length, attr_count;
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Dwarf_Half tag;
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Dwarf_Error de;
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int ret;
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while ((ret = dwarf_next_cu_header(dbg, NULL, NULL, &aboff,
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NULL, NULL, &de)) == DW_DLV_OK) {
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while ((ret = dwarf_get_abbrev(re->dbg, aboff, &ab, &length,
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&attr_count, &de)) == DW_DLV_OK) {
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if (length == 1) /* Last entry. */
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break;
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aboff += length;
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if (dwarf_get_abbrev_tag(ab, &tag, &de) != DW_DLV_OK) {
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warnx("dwarf_get_abbrev_tag failed: %s",
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dwarf_errmsg(de));
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continue;
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}
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if (ret != DW_DLV_OK)
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warnx("dwarf_get_abbrev: %s", dwarf_errmsg(de));
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}
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if (ret == DW_DLV_ERROR)
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warnx("dwarf_next_cu_header: %s", dwarf_errmsg(de));
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.Ed
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.Sh ERRORS
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Function
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.Fn dwarf_get_abbrev
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can fail with:
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.Bl -tag -width ".Bq Er DW_DLE_NO_ENTRY"
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.It Bq Er DW_DLE_ARGUMENT
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One of the arguments
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.Ar dbg ,
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.Ar ret_abbrev ,
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.Ar length
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or
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.Ar attr_count
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was NULL.
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.It Bq Er DW_DLE_NO_ENTRY
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There is no abbreviation information at offset
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.Ar offset .
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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_dealloc 3 ,
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.Xr dwarf_get_abbrev_children_flag 3 ,
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.Xr dwarf_get_abbrev_code 3 ,
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.Xr dwarf_get_abbrev_entry 3 ,
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.Xr dwarf_get_abbrev_tag 3
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