Updated: 2022/Sep/29

Please read Privacy Policy. It's for your privacy.

DWARF_GET_WEAKS(3)         Library Functions Manual         DWARF_GET_WEAKS(3)

NAME
     dwarf_get_weaks, dwarf_weak_cu_offset, dwarf_weak_die_offset,
     dwarf_weak_name_offsets, dwarf_weakname - retrieve information about weak
     symbols

LIBRARY
     DWARF Access Library (libdwarf, -ldwarf)

SYNOPSIS
     #include <libdwarf.h>

     int
     dwarf_get_weaks(Dwarf_Debug dbg, Dwarf_Weak **weaks,
         Dwarf_Signed *nweaks, Dwarf_Error *err);

     int
     dwarf_weak_cu_offset(Dwarf_Weak weak, Dwarf_Off *cu_offset,
         Dwarf_Error *err);

     int
     dwarf_weak_die_offset(Dwarf_Weak weak, Dwarf_Off *die_offset,
         Dwarf_Error *err);

     int
     dwarf_weak_name_offsets(Dwarf_Weak weak, char **name,
         Dwarf_Off *die_offset, Dwarf_Off *cu_die_offset, Dwarf_Error *err);

     int
     dwarf_weakname(Dwarf_Weak weak, char **name, Dwarf_Error *err);

DESCRIPTION
     These functions retrieve information about weak symbols from the lookup
     tables in the (SGI-specific) ".debug_weaknames" section.  Information
     about weak symbols is returned using opaque descriptors of type
     Dwarf_Weak.  Applications need to use the functions described below to
     retrieve the name and offset information contained in these descriptors.

     Function dwarf_get_weaks() retrieves descriptors for all the weak symbols
     associated with the DWARF debug context specified by argument dbg.  The
     argument weaks should point to a location that will be set to a pointer
     to an array of Dwarf_Weak descriptors.  The argument nweaks should point
     to a location that will be set to the number of descriptors returned.

     Function dwarf_weak_cu_offset() returns the offset, relative to the
     ".debug_info" section, of the compilation unit that contains the
     debugging information entry associated with the argument weak.  Argument
     cu_offset should point to a location that will hold the returned offset.

     Function dwarf_weak_die_offset() retrieves the offset, relative to the
     ".debug_info" section, of the debugging information entry associated with
     the argument weak, and stores it into the location pointed to by the
     argument die_offset.

     Function dwarf_weak_name_offsets() retrieves the name and offsets for the
     debugging information entry for argument weak.  Argument 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 die_offset should point to a location which will be set to the
     offset, relative to the ".debug_info" section, of the associated
     debugging information entry.  Argument cu_die_offset should point to a
     location which will be set to the offset, relative to the ".debug_info"
     section, of the first debugging information entry in the compilation unit
     associated with argument weak.

     Function dwarf_weakname() sets the location pointed to by argument name
     to a pointer to a NUL-terminated string holding the name of the debugging
     information entry associated with the argument weak.

   Memory Management
     The memory area used for the array of Dwarf_Weak descriptors returned in
     argument weaks by function dwarf_get_weaks() is owned by the DWARF Access
     Library (libdwarf, -ldwarf).  Application code should not attempt to
     directly free this pointer.  Portable code should instead use the
     function dwarf_weaks_dealloc(3) to indicate that the memory area may be
     freed.

     The memory area used for the string returned in the name argument to
     functions dwarf_weak_name_offsets() and dwarf_weakname() is owned by the
     DWARF Access Library (libdwarf, -ldwarf).  Portable code should indicate
     that the memory area can be freed using the dwarf_dealloc(3) function.

   Error Returns
     If argument err is not NULL, these functions will use it to store error
     information, in case of an error.

RETURN VALUES
     On success, these functions returns DW_DLV_OK.  In case of an error, they
     return DW_DLV_ERROR and set the argument err.

ERRORS
     These functions may fail with the following errors:

     [DW_DLE_ARGUMENT]       One of the arguments cu_die_offset, cu_offset,
                             dbg, die_offset, weak, weaks, name, or nweaks was
                             NULL.

     [DW_DLE_NO_ENTRY]       The DWARF debugging context referenced by
                             argument dbg did not contain information about
                             weak symbols.

SEE ALSO
     dwarf(3), dwarf_get_cu_die_offset_given_cu_header_offset(3),
     dwarf_weaks_dealloc(3)

NetBSD 10.99                    April 10, 2011                    NetBSD 10.99