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Diffstat (limited to 'rtemstoolkit/elftoolchain/libdwarf/dwarf_get_weaks.3')
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diff --git a/rtemstoolkit/elftoolchain/libdwarf/dwarf_get_weaks.3 b/rtemstoolkit/elftoolchain/libdwarf/dwarf_get_weaks.3 new file mode 100644 index 0000000..470973e --- /dev/null +++ b/rtemstoolkit/elftoolchain/libdwarf/dwarf_get_weaks.3 @@ -0,0 +1,215 @@ +.\" Copyright (c) 2011 Kai Wang +.\" All rights reserved. +.\" +.\" Redistribution and use in source and binary forms, with or without +.\" modification, are permitted provided that the following conditions +.\" are met: +.\" 1. Redistributions of source code must retain the above copyright +.\" notice, this list of conditions and the following disclaimer. +.\" 2. Redistributions in binary form must reproduce the above copyright +.\" notice, this list of conditions and the following disclaimer in the +.\" documentation and/or other materials provided with the distribution. +.\" +.\" THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND +.\" ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE +.\" IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE +.\" ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE +.\" FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL +.\" DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS +.\" OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) +.\" HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT +.\" LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY +.\" OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF +.\" SUCH DAMAGE. +.\" +.\" $Id: dwarf_get_weaks.3 2071 2011-10-27 03:20:00Z jkoshy $ +.\" +.Dd April 10, 2011 +.Os +.Dt DWARF_GET_WEAKS 3 +.Sh NAME +.Nm dwarf_get_weaks , +.Nm dwarf_weak_cu_offset , +.Nm dwarf_weak_die_offset , +.Nm dwarf_weak_name_offsets , +.Nm dwarf_weakname +.Nd retrieve information about weak symbols +.Sh LIBRARY +.Lb libdwarf +.Sh SYNOPSIS +.In libdwarf.h +.Ft int +.Fo dwarf_get_weaks +.Fa "Dwarf_Debug dbg" +.Fa "Dwarf_Weak **weaks" +.Fa "Dwarf_Signed *nweaks" +.Fa "Dwarf_Error *err" +.Fc +.Ft int +.Fo dwarf_weak_cu_offset +.Fa "Dwarf_Weak weak" +.Fa "Dwarf_Off *cu_offset" +.Fa "Dwarf_Error *err" +.Fc +.Ft int +.Fo dwarf_weak_die_offset +.Fa "Dwarf_Weak weak" +.Fa "Dwarf_Off *die_offset" +.Fa "Dwarf_Error *err" +.Fc +.Ft int +.Fo dwarf_weak_name_offsets +.Fa "Dwarf_Weak weak" +.Fa "char **name" +.Fa "Dwarf_Off *die_offset" +.Fa "Dwarf_Off *cu_die_offset" +.Fa "Dwarf_Error *err" +.Fc +.Ft int +.Fo dwarf_weakname +.Fa "Dwarf_Weak weak" +.Fa "char **name" +.Fa "Dwarf_Error *err" +.Fc +.Sh DESCRIPTION +These functions retrieve information about weak symbols from the +lookup tables in the (SGI-specific) +.Dq ".debug_weaknames" +section. +Information about weak symbols is returned using opaque descriptors +of type +.Vt Dwarf_Weak . +Applications need to use the functions described below to retrieve +the name and offset information contained in these descriptors. +.Pp +Function +.Fn dwarf_get_weaks +retrieves descriptors for all the weak symbols associated with the +DWARF debug context specified by argument +.Ar dbg . +The argument +.Ar weaks +should point to a location that will be set to a pointer to an array +of +.Vt Dwarf_Weak +descriptors. +The argument +.Ar nweaks +should point to a location that will be set to the number of +descriptors returned. +.Pp +Function +.Fn dwarf_weak_cu_offset +returns the offset, relative to the +.Dq ".debug_info" +section, of the compilation unit that contains the debugging +information entry associated with the argument +.Ar weak . +Argument +.Ar cu_offset +should point to a location that will hold the returned offset. +.Pp +Function +.Fn dwarf_weak_die_offset +retrieves the offset, relative to the +.Dq ".debug_info" +section, of the debugging information entry associated with the +argument +.Ar weak , +and stores it into the location pointed to by the argument +.Ar die_offset . +.Pp +Function +.Fn dwarf_weak_name_offsets +retrieves the name and offsets for the debugging information +entry for argument +.Ar weak . +Argument +.Ar name +should point to a location which will be set to a pointer to a +NUL-terminated string containing the name of the associated debugging +information entry. +Argument +.Ar die_offset +should point to a location which will be set to the offset, relative +to the +.Dq ".debug_info" +section, of the associated debugging information entry. +Argument +.Ar cu_die_offset +should point to a location which will be set to the +offset, relative to the +.Dq ".debug_info" +section, of the first debugging information entry in the compilation +unit associated with argument +.Ar weak . +.Pp +Function +.Fn dwarf_weakname +sets the location pointed to by argument +.Ar name +to a pointer to a NUL-terminated string holding the name of the +debugging information entry associated with the argument +.Ar weak . +.Ss Memory Management +The memory area used for the array of +.Vt Dwarf_Weak +descriptors returned in argument +.Ar weaks +by function +.Fn dwarf_get_weaks +is owned by the +.Lb libdwarf . +Application code should not attempt to directly free this pointer. +Portable code should instead use the function +.Xr dwarf_weaks_dealloc 3 +to indicate that the memory area may be freed. +.Pp +The memory area used for the string returned in the +.Ar name +argument to functions +.Fn dwarf_weak_name_offsets +and +.Fn dwarf_weakname +is owned by the +.Lb libdwarf . +Portable code should indicate that the memory area can +be freed using the +.Xr dwarf_dealloc 3 +function. +.Ss Error Returns +If argument +.Ar err +is not NULL, these functions will use it to store error information, +in case of an error. +.Sh RETURN VALUES +On success, these functions returns +.Dv DW_DLV_OK . +In case of an error, they return +.Dv DW_DLV_ERROR +and set the argument +.Ar err . +.Sh ERRORS +These functions may fail with the following errors: +.Bl -tag -width ".Bq Er DW_DLE_ARGUMENT" +.It Bq Er DW_DLE_ARGUMENT +One of the arguments +.Va cu_die_offset , +.Va cu_offset , +.Va dbg , +.Va die_offset , +.Va weak , +.Va weaks , +.Va name , +or +.Va nweaks +was NULL. +.It Bq Er DW_DLE_NO_ENTRY +The DWARF debugging context referenced by argument +.Ar dbg +did not contain information about weak symbols. +.El +.Sh SEE ALSO +.Xr dwarf 3 , +.Xr dwarf_get_cu_die_offset_given_cu_header_offset 3 , +.Xr dwarf_weaks_dealloc 3 |