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| <a name="typedef-bfd-1"></a> |
| <h3 class="section">2.1 <code>typedef bfd</code></h3> |
| <p>A BFD has type <code>bfd</code>; objects of this type are the |
| cornerstone of any application using BFD. Using BFD |
| consists of making references though the BFD and to data in the BFD. |
| </p> |
| <p>Here is the structure that defines the type <code>bfd</code>. It |
| contains the major data about the file and pointers |
| to the rest of the data. |
| </p> |
| |
| <div class="example"> |
| <pre class="example"> |
| enum bfd_direction |
| { |
| no_direction = 0, |
| read_direction = 1, |
| write_direction = 2, |
| both_direction = 3 |
| }; |
| |
| struct bfd |
| { |
| /* A unique identifier of the BFD */ |
| unsigned int id; |
| |
| /* The filename the application opened the BFD with. */ |
| const char *filename; |
| |
| /* A pointer to the target jump table. */ |
| const struct bfd_target *xvec; |
| |
| /* The IOSTREAM, and corresponding IO vector that provide access |
| to the file backing the BFD. */ |
| void *iostream; |
| const struct bfd_iovec *iovec; |
| |
| /* The caching routines use these to maintain a |
| least-recently-used list of BFDs. */ |
| struct bfd *lru_prev, *lru_next; |
| |
| /* When a file is closed by the caching routines, BFD retains |
| state information on the file here... */ |
| ufile_ptr where; |
| |
| /* File modified time, if mtime_set is TRUE. */ |
| long mtime; |
| |
| /* Reserved for an unimplemented file locking extension. */ |
| int ifd; |
| |
| /* The format which belongs to the BFD. (object, core, etc.) */ |
| bfd_format format; |
| |
| /* The direction with which the BFD was opened. */ |
| enum bfd_direction direction; |
| |
| /* Format_specific flags. */ |
| flagword flags; |
| |
| /* Values that may appear in the flags field of a BFD. These also |
| appear in the object_flags field of the bfd_target structure, where |
| they indicate the set of flags used by that backend (not all flags |
| are meaningful for all object file formats) (FIXME: at the moment, |
| the object_flags values have mostly just been copied from backend |
| to another, and are not necessarily correct). */ |
| |
| #define BFD_NO_FLAGS 0x00 |
| |
| /* BFD contains relocation entries. */ |
| #define HAS_RELOC 0x01 |
| |
| /* BFD is directly executable. */ |
| #define EXEC_P 0x02 |
| |
| /* BFD has line number information (basically used for F_LNNO in a |
| COFF header). */ |
| #define HAS_LINENO 0x04 |
| |
| /* BFD has debugging information. */ |
| #define HAS_DEBUG 0x08 |
| |
| /* BFD has symbols. */ |
| #define HAS_SYMS 0x10 |
| |
| /* BFD has local symbols (basically used for F_LSYMS in a COFF |
| header). */ |
| #define HAS_LOCALS 0x20 |
| |
| /* BFD is a dynamic object. */ |
| #define DYNAMIC 0x40 |
| |
| /* Text section is write protected (if D_PAGED is not set, this is |
| like an a.out NMAGIC file) (the linker sets this by default, but |
| clears it for -r or -N). */ |
| #define WP_TEXT 0x80 |
| |
| /* BFD is dynamically paged (this is like an a.out ZMAGIC file) (the |
| linker sets this by default, but clears it for -r or -n or -N). */ |
| #define D_PAGED 0x100 |
| |
| /* BFD is relaxable (this means that bfd_relax_section may be able to |
| do something) (sometimes bfd_relax_section can do something even if |
| this is not set). */ |
| #define BFD_IS_RELAXABLE 0x200 |
| |
| /* This may be set before writing out a BFD to request using a |
| traditional format. For example, this is used to request that when |
| writing out an a.out object the symbols not be hashed to eliminate |
| duplicates. */ |
| #define BFD_TRADITIONAL_FORMAT 0x400 |
| |
| /* This flag indicates that the BFD contents are actually cached |
| in memory. If this is set, iostream points to a bfd_in_memory |
| struct. */ |
| #define BFD_IN_MEMORY 0x800 |
| |
| /* The sections in this BFD specify a memory page. */ |
| #define HAS_LOAD_PAGE 0x1000 |
| |
| /* This BFD has been created by the linker and doesn't correspond |
| to any input file. */ |
| #define BFD_LINKER_CREATED 0x2000 |
| |
| /* This may be set before writing out a BFD to request that it |
| be written using values for UIDs, GIDs, timestamps, etc. that |
| will be consistent from run to run. */ |
| #define BFD_DETERMINISTIC_OUTPUT 0x4000 |
| |
| /* Compress sections in this BFD. */ |
| #define BFD_COMPRESS 0x8000 |
| |
| /* Decompress sections in this BFD. */ |
| #define BFD_DECOMPRESS 0x10000 |
| |
| /* BFD is a dummy, for plugins. */ |
| #define BFD_PLUGIN 0x20000 |
| |
| /* Flags bits to be saved in bfd_preserve_save. */ |
| #define BFD_FLAGS_SAVED \ |
| (BFD_IN_MEMORY | BFD_COMPRESS | BFD_DECOMPRESS | BFD_PLUGIN) |
| |
| /* Flags bits which are for BFD use only. */ |
| #define BFD_FLAGS_FOR_BFD_USE_MASK \ |
| (BFD_IN_MEMORY | BFD_COMPRESS | BFD_DECOMPRESS | BFD_LINKER_CREATED \ |
| | BFD_PLUGIN | BFD_TRADITIONAL_FORMAT | BFD_DETERMINISTIC_OUTPUT) |
| |
| /* Currently my_archive is tested before adding origin to |
| anything. I believe that this can become always an add of |
| origin, with origin set to 0 for non archive files. */ |
| ufile_ptr origin; |
| |
| /* The origin in the archive of the proxy entry. This will |
| normally be the same as origin, except for thin archives, |
| when it will contain the current offset of the proxy in the |
| thin archive rather than the offset of the bfd in its actual |
| container. */ |
| ufile_ptr proxy_origin; |
| |
| /* A hash table for section names. */ |
| struct bfd_hash_table section_htab; |
| |
| /* Pointer to linked list of sections. */ |
| struct bfd_section *sections; |
| |
| /* The last section on the section list. */ |
| struct bfd_section *section_last; |
| |
| /* The number of sections. */ |
| unsigned int section_count; |
| |
| /* Stuff only useful for object files: |
| The start address. */ |
| bfd_vma start_address; |
| |
| /* Used for input and output. */ |
| unsigned int symcount; |
| |
| /* Symbol table for output BFD (with symcount entries). |
| Also used by the linker to cache input BFD symbols. */ |
| struct bfd_symbol **outsymbols; |
| |
| /* Used for slurped dynamic symbol tables. */ |
| unsigned int dynsymcount; |
| |
| /* Pointer to structure which contains architecture information. */ |
| const struct bfd_arch_info *arch_info; |
| |
| /* Stuff only useful for archives. */ |
| void *arelt_data; |
| struct bfd *my_archive; /* The containing archive BFD. */ |
| struct bfd *archive_next; /* The next BFD in the archive. */ |
| struct bfd *archive_head; /* The first BFD in the archive. */ |
| struct bfd *nested_archives; /* List of nested archive in a flattened |
| thin archive. */ |
| |
| /* A chain of BFD structures involved in a link. */ |
| struct bfd *link_next; |
| |
| /* A field used by _bfd_generic_link_add_archive_symbols. This will |
| be used only for archive elements. */ |
| int archive_pass; |
| |
| /* Used by the back end to hold private data. */ |
| union |
| { |
| struct aout_data_struct *aout_data; |
| struct artdata *aout_ar_data; |
| struct _oasys_data *oasys_obj_data; |
| struct _oasys_ar_data *oasys_ar_data; |
| struct coff_tdata *coff_obj_data; |
| struct pe_tdata *pe_obj_data; |
| struct xcoff_tdata *xcoff_obj_data; |
| struct ecoff_tdata *ecoff_obj_data; |
| struct ieee_data_struct *ieee_data; |
| struct ieee_ar_data_struct *ieee_ar_data; |
| struct srec_data_struct *srec_data; |
| struct verilog_data_struct *verilog_data; |
| struct ihex_data_struct *ihex_data; |
| struct tekhex_data_struct *tekhex_data; |
| struct elf_obj_tdata *elf_obj_data; |
| struct nlm_obj_tdata *nlm_obj_data; |
| struct bout_data_struct *bout_data; |
| struct mmo_data_struct *mmo_data; |
| struct sun_core_struct *sun_core_data; |
| struct sco5_core_struct *sco5_core_data; |
| struct trad_core_struct *trad_core_data; |
| struct som_data_struct *som_data; |
| struct hpux_core_struct *hpux_core_data; |
| struct hppabsd_core_struct *hppabsd_core_data; |
| struct sgi_core_struct *sgi_core_data; |
| struct lynx_core_struct *lynx_core_data; |
| struct osf_core_struct *osf_core_data; |
| struct cisco_core_struct *cisco_core_data; |
| struct versados_data_struct *versados_data; |
| struct netbsd_core_struct *netbsd_core_data; |
| struct mach_o_data_struct *mach_o_data; |
| struct mach_o_fat_data_struct *mach_o_fat_data; |
| struct plugin_data_struct *plugin_data; |
| struct bfd_pef_data_struct *pef_data; |
| struct bfd_pef_xlib_data_struct *pef_xlib_data; |
| struct bfd_sym_data_struct *sym_data; |
| void *any; |
| } |
| tdata; |
| |
| /* Used by the application to hold private data. */ |
| void *usrdata; |
| |
| /* Where all the allocated stuff under this BFD goes. This is a |
| struct objalloc *, but we use void * to avoid requiring the inclusion |
| of objalloc.h. */ |
| void *memory; |
| |
| /* Is the file descriptor being cached? That is, can it be closed as |
| needed, and re-opened when accessed later? */ |
| unsigned int cacheable : 1; |
| |
| /* Marks whether there was a default target specified when the |
| BFD was opened. This is used to select which matching algorithm |
| to use to choose the back end. */ |
| unsigned int target_defaulted : 1; |
| |
| /* ... and here: (``once'' means at least once). */ |
| unsigned int opened_once : 1; |
| |
| /* Set if we have a locally maintained mtime value, rather than |
| getting it from the file each time. */ |
| unsigned int mtime_set : 1; |
| |
| /* Flag set if symbols from this BFD should not be exported. */ |
| unsigned int no_export : 1; |
| |
| /* Remember when output has begun, to stop strange things |
| from happening. */ |
| unsigned int output_has_begun : 1; |
| |
| /* Have archive map. */ |
| unsigned int has_armap : 1; |
| |
| /* Set if this is a thin archive. */ |
| unsigned int is_thin_archive : 1; |
| |
| /* Set if only required symbols should be added in the link hash table for |
| this object. Used by VMS linkers. */ |
| unsigned int selective_search : 1; |
| }; |
| |
| /* See note beside bfd_set_section_userdata. */ |
| static inline bfd_boolean |
| bfd_set_cacheable (bfd * abfd, bfd_boolean val) |
| { |
| abfd->cacheable = val; |
| return TRUE; |
| } |
| |
| </pre></div> |
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