dwarf_get_weaks,
dwarf_weak_cu_offset,
dwarf_weak_die_offset,
dwarf_weak_name_offsets,
dwarf_weakname —
retrieve information about weak symbols
DWARF Access Library (libdwarf, -ldwarf)
#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);
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.
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.
If argument
err is not NULL, these functions
will use it to store error information, in case of an error.
On success, these functions returns
DW_DLV_OK
. In case of an error, they return
DW_DLV_ERROR
and set the argument
err.
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.
dwarf(3),
dwarf_get_cu_die_offset_given_cu_header_offset(3),
dwarf_weaks_dealloc(3)