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
211 lines
5.8 KiB
Groff
211 lines
5.8 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_vars.3 3640 2018-10-14 14:09:13Z jkoshy $
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.\"
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.Dd April 2, 2011
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.Dt DWARF_GET_VARS 3
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.Os
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.Sh NAME
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.Nm dwarf_get_vars ,
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.Nm dwarf_var_cu_offset ,
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.Nm dwarf_var_die_offset ,
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.Nm dwarf_var_name_offsets ,
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.Nm dwarf_varname
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.Nd retrieve information about static variables
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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_vars
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.Fa "Dwarf_Debug dbg"
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.Fa "Dwarf_Var **vars"
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.Fa "Dwarf_Signed *nvars"
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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_var_cu_offset
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.Fa "Dwarf_Var var"
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.Fa "Dwarf_Off *cu_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_var_die_offset
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.Fa "Dwarf_Var var"
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.Fa "Dwarf_Off *die_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_var_name_offsets
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.Fa "Dwarf_Var var"
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.Fa "char **name"
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.Fa "Dwarf_Off *die_offset"
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.Fa "Dwarf_Off *cu_die_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_varname
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.Fa "Dwarf_Var var"
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.Fa "char **name"
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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 retrieve information about the file scope static
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variables associated with a DWARF debug context.
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Information about these static variables is returned using opaque
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descriptors of type
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.Vt Dwarf_Var .
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Applications need to use the functions described below to retrieve
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the name and offset information contained in these descriptors.
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.Pp
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Function
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.Fn dwarf_get_vars
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retrieves descriptors for all the static variables associated with the
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DWARF debug context specified by argument
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.Ar dbg .
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The argument
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.Ar vars
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should point to a location that will be set to a pointer to an array
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of
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.Vt Dwarf_Var
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descriptors.
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The argument
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.Ar nvars
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should point to a location that will be set to the number of
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descriptors returned.
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.Pp
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Function
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.Fn dwarf_var_cu_offset
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returns the section-relative offset, relative to the
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.Dq ".debug_info"
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section, of the compilation unit that
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contains the debugging information entry associated with the argument
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.Ar var .
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Argument
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.Ar cu_offset
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should point to a location that will hold the returned offset.
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.Pp
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Function
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.Fn dwarf_var_die_offset
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retrieves the section-relative offset, relative to the
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.Dq ".debug_info"
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section, of the debugging information
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entry associated with the argument
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.Ar var ,
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and stores it into the location pointed to by the argument
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.Ar die_offset .
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.Pp
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Function
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.Fn dwarf_var_name_offsets
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retrieves both the name and the associated offsets for the debugging
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information entry for argument
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.Ar var .
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Argument
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.Ar name
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should point to a location which will be set to a pointer to a
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NUL-terminated string containing the name of the associated debugging
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information entry.
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Argument
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.Ar die_offset
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should point to a location which will be set to a section-relative
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offset, relative to the
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.Dq ".debug_info"
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section, of the associated debugging information entry.
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Argument
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.Ar cu_die_offset
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should point to a location which will be set to a
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section-relative offset, relative to the
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.Dq ".debug_info"
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section, of the first debugging information entry in
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the compilation unit associated with argument
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.Ar var .
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.Pp
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Function
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.Fn dwarf_varname
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sets the location pointed to by argument
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.Ar name
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to a pointer to a NUL-terminated string holding the name of the
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debugging information entry associated with the argument
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.Ar var .
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.Ss Memory Management
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The memory area used for the array of
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.Vt Dwarf_Var
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descriptors returned in argument
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.Ar vars
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by function
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.Fn dwarf_get_vars
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is owned by the
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.Lb libdwarf .
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Application code should not attempt to directly free this pointer.
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Portable code should instead use the function
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.Xr dwarf_vars_dealloc 3
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to indicate that the memory area may be freed.
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.Pp
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The memory area used for the string returned in the
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.Ar name
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argument to functions
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.Fn dwarf_var_name_offsets
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and
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.Fn dwarf_varname
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is owned by the
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.Lb libdwarf .
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Portable code should indicate that the memory area can
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be freed using the
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.Xr dwarf_dealloc 3
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function.
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.Ss Error Returns
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If argument
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.Ar err
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is not NULL, these functions will use it to store error information,
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in case of an error.
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.Sh RETURN VALUES
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On success, these functions returns
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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 the argument
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.Ar err .
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.Sh ERRORS
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These functions may 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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One of the arguments
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.Va cu_die_offset ,
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.Va cu_offset ,
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.Va dbg ,
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.Va die_offset ,
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.Va var ,
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.Va vars ,
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.Va name ,
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or
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.Va nvars
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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_dealloc 3 ,
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.Xr dwarf_get_cu_die_offset_given_cu_header_offset 3 ,
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.Xr dwarf_vars_dealloc 3
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