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DWARF_GET_TYPES(3) FreeBSD Library Functions Manual DWARF_GET_TYPES(3)
NAME dwarf_get_types, dwarf_type_cu_offset, dwarf_type_die_offset, dwarf_type_name_offsets, dwarf_typename - retrieve information about user-defined types
LIBRARY DWARF Access Library (libdwarf, -ldwarf)
SYNOPSIS #include <libdwarf.h>
int dwarf_get_types(Dwarf_Debug dbg, Dwarf_Type **types, Dwarf_Signed *ntypes, Dwarf_Error *err);
int dwarf_type_cu_offset(Dwarf_Type type, Dwarf_Off *cu_offset, Dwarf_Error *err);
int dwarf_type_die_offset(Dwarf_Type type, Dwarf_Off *die_offset, Dwarf_Error *err);
int dwarf_type_name_offsets(Dwarf_Type type, char **name, Dwarf_Off *die_offset, Dwarf_Off *cu_die_offset, Dwarf_Error *err);
int dwarf_typename(Dwarf_Type type, char **name, Dwarf_Error *err);
DESCRIPTION These APIs retrieve information about user-defined types from the SGI- specific ".debug_typenames" section.
Standards-conformant applications should use the functions dwarf_get_pubtypes(3), dwarf_pubtype_cu_offset(3), dwarf_pubtype_die_offset(3), dwarf_pubtype_name_offsets(3) and dwarf_pubtypename(3), which operate on the equivalent ".debug_pubtypes" section defined by the DWARF3 standard.
Information about user-defined types is returned using opaque descriptors of type Dwarf_Type. Applications need to use the functions described below to retrieve the name and offset information contained in these descriptors.
Function dwarf_get_types() retrieves descriptors for all user-defined types associated with the DWARF debug context specified by argument dbg. The argument types should point to a location that will be set to a pointer to an array of Dwarf_Type descriptors. The argument ntypes should point to a location that will be set to the number of descriptors returned.
Function dwarf_type_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 type. Argument cu_offset should point to a location that will hold the returned offset.
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 a offset, relative to the ".debug_info" section, of the first debugging information entry in the compilation unit associated with argument type.
Function dwarf_typename() 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 type.
Memory Management The memory area used for the array of Dwarf_Type descriptors returned in argument types by function dwarf_get_types() 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_types_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_type_name_offsets() and dwarf_typename() 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, type, types, name, or ntypes was NULL.
[DW_DLE_NO_ENTRY] The DWARF debugging context referenced by argument dbg did not contain information about user-defined types.
SEE ALSO dwarf(3), dwarf_get_cu_die_offset_given_cu_header_offset(3), dwarf_get_pubtypes(3), dwarf_pubtype_cu_offset(3), dwarf_pubtype_die_offset(3), dwarf_pubtype_name_offsets(3), dwarf_pubtypename(3), dwarf_types_dealloc(3)
FreeBSD 14.0-RELEASE-p11 April 10, 2011 FreeBSD 14.0-RELEASE-p11