b00fe64f4a
Highlights: - Fix man page markup, whitespace, and typos - Fix sh_info of SHT_GROUP section to point to the correct string - Improve validation in readelf and elfcopy/strip - Handle DWARF 4's DW_AT_high_pc in addr2line Sponsored by: The FreeBSD Foundation
289 lines
8.2 KiB
Groff
289 lines
8.2 KiB
Groff
.\" Copyright (c) 2010,2014 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_next_cu_header.3 3182 2015-04-10 16:08:10Z emaste $
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.\"
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.Dd December 21, 2014
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.Os
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.Dt DWARF_NEXT_CU_HEADER 3
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.Sh NAME
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.Nm dwarf_next_cu_header ,
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.Nm dwarf_next_cu_header_b ,
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.Nm dwarf_next_cu_header_c
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.Nd step through compilation units in a DWARF debug context
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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_next_cu_header
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.Fa "Dwarf_Debug dbg"
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.Fa "Dwarf_Unsigned *cu_length"
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.Fa "Dwarf_Half *cu_version"
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.Fa "Dwarf_Off *cu_abbrev_offset"
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.Fa "Dwarf_Half *cu_pointer_size"
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.Fa "Dwarf_Unsigned *cu_next_offset"
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.Fa "Dwarf_Error *err"
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.Fc
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.Ft int
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.Fo dwarf_next_cu_header_b
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.Fa "Dwarf_Debug dbg"
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.Fa "Dwarf_Unsigned *cu_length"
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.Fa "Dwarf_Half *cu_version"
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.Fa "Dwarf_Off *cu_abbrev_offset"
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.Fa "Dwarf_Half *cu_pointer_size"
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.Fa "Dwarf_Half *cu_offset_size"
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.Fa "Dwarf_Half *cu_extension_size"
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.Fa "Dwarf_Unsigned *cu_next_offset"
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.Fa "Dwarf_Error *err"
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.Fc
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.Ft int
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.Fo dwarf_next_cu_header_c
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.Fa "Dwarf_Debug dbg"
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.Fa "Dwarf_Bool is_info"
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.Fa "Dwarf_Unsigned *cu_length"
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.Fa "Dwarf_Half *cu_version"
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.Fa "Dwarf_Off *cu_abbrev_offset"
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.Fa "Dwarf_Half *cu_pointer_size"
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.Fa "Dwarf_Half *cu_offset_size"
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.Fa "Dwarf_Half *cu_extension_size"
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.Fa "Dwarf_Sig8 *type_signature"
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.Fa "Dwarf_Unsigned *type_offset"
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.Fa "Dwarf_Unsigned *cu_next_offset"
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.Fa "Dwarf_Error *err"
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.Fc
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.Sh DESCRIPTION
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These functions are used to step through compilation or type units
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associated with a DWARF debug context, optionally returning information
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about the unit.
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.Pp
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Function
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.Fn dwarf_next_cu_header_c
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is the API recommended for new application code.
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Function
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.Fn dwarf_next_cu_header
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and
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.Fn dwarf_next_cu_header_b
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can only operate on compilation units associated with the
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.Dq \&.debug_info
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section.
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They are less general than function
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.Fn dwarf_next_cu_header_c ,
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and are deprecated for use by new application code.
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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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If argument
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.Ar is_info
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is set to 1,
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the function returns information for compilation units found in the
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.Dq \&.debug_info
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section.
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If argument
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.Ar is_info
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is set to 0,
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the function returns information for type units found in the
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.Dq \&.debug_types
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sections.
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Argument
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.Ar cu_length
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should point to a location that will be set to the
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length of the compilation or type unit.
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Argument
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.Ar cu_version
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should point to a location that will be set to the
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version number for the compilation or type unit.
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Argument
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.Ar cu_abbrev_offset
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should point to a location that will be set to the
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starting offset (in the
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.Dq .debug_abbrev
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section) of the set of debugging information entry abbreviations
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associated with this compilation or type unit.
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Argument
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.Ar cu_pointer_size
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should point to a location that will be set to the
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size in bytes of an address for the machine architecture of the
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underlying object being debugged.
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Argument
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.Ar cu_offset_size
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should point to a location that will be set to the
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size in bytes for a DWARF offset in the compilation or type unit.
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Argument
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.Ar cu_extension_size
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is only needed for processing MIPS/IRIX objects that use
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a non-standard DWARF format.
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It should point to a location that will be set to 4 for normal
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objects and to 0 for non-standard ones.
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Argument
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.Ar type_signature
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and
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.Ar type_offset
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is only needed for processing type units.
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Argument
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.Ar type_signature
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should point to a location that will be set to the 64-bit unique signature
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of the type described in the type unit.
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Argument
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.Ar type_offset
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should point to a location that will be set to the offset of the debugging
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information entry that describes the type.
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Argument
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.Ar cu_next_offset
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should point to a location that will be set to the
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offset of the next compilation unit header in the
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.Dq \&.debug_info
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section,
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or the offset of the next type unit header in the
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.Dq \&.debug_types
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section.
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Argument
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.Ar err
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should point to a location that will hold an error descriptor in case
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of an error.
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.Pp
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Function
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.Fn dwarf_next_cu_header_b
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is identical to function
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.Fn dwarf_next_cu_header_c
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except that it does not provide arguments
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.Ar is_info ,
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.Ar type_signature
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and
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.Ar type_offset .
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.Pp
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Function
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.Fn dwarf_next_cu_header
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is identical to function
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.Fn dwarf_next_cu_header_b
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except that it does not provide arguments
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.Ar cu_offset_size
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and
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.Ar cu_extension_size .
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.Pp
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A value of NULL may be used for any of the arguments
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.Ar cu_length ,
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.Ar cu_version ,
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.Ar cu_abbrev_offset ,
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.Ar cu_pointer_size ,
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.Ar cu_offset_size ,
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.Ar cu_extension_size ,
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.Ar type_signature ,
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.Ar type_offset ,
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.Ar cu_next_offset
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and
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.Ar err
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if the caller is not interested in the respective value.
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.Ss Iterating Through Compilation Units in a Debug Context
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.Pp
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The first call to function
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.Fn dwarf_next_cu_header_c
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for a given debug context with argument
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.Ar is_info
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set to 1 will return information about the first
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compilation unit in the
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.Dq \&.debug_info
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section.
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Subsequent calls to the function will iterate through the remaining
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compilation units in the section.
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On stepping past the last compilation unit in the section,
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function
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.Fn dwarf_next_cu_header_c
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returns
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.Dv DW_DLV_NO_ENTRY
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and resets its internal state.
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The next call to the function will restart from the first compilation
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unit in the section.
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.Ss Iterating Through Type Units in a Debug Context
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When a DWARF debug context is allocated using
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.Xr dwarf_init 3 ,
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an internal pointer associated with the context will point to the first
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.Dq \&.debug_types
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section found in the debug object.
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The first call to function
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.Fn dwarf_next_cu_header_c
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for the debug context with argument
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.Ar is_info
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set to 0 will return information about the first
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type unit in that
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.Dq \&.debug_types
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section.
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Subsequent calls to the function will iterate through the remaining
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type units in the section.
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On stepping past the last type unit in the debug context,
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function
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.Fn dwarf_next_cu_header_c
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returns
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.Dv DW_DLV_NO_ENTRY
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and resets its internal state.
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The next call to the function will restart from the first type
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unit in the
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.Dq \&.debug_types
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section.
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.Pp
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If the debug object contains multiple
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.Dq \&.debug_types
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sections, the function
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.Fn dwarf_next_types_section
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can be called to move the internal pointer to the next
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.Dq \&.debug_types
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section.
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As a result, subsequent calls of the function
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.Fn dwarf_next_cu_header_c
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will operate on the new
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.Dq \&.debug_types
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section.
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Function
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.Fn dwarf_next_types_section
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returns
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.Dv DW_DLV_NO_ENTRY
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when there are no more
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.Dq \&.debug_types
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sections left in the debug object.
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.Sh RETURN VALUES
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On success, these functions return
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.Dv DW_DLV_OK .
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In case of an error, they return
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.Dv DW_DLV_ERROR
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and set argument
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.Ar err .
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When there are no more compilation units left to traverse, they return
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.Dv DW_DLV_NO_ENTRY .
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.Sh ERRORS
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These functions can fail with the following error:
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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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Argument
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.Va dbg
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was NULL.
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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_get_cu_die_offset_given_cu_header_offset 3 ,
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.Xr dwarf_init 3 ,
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.Xr dwarf_next_types_section 3 ,
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.Xr dwarf_siblingof 3
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