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)