/* Object file "section" support for the BFD library.
- Copyright (C) 1990, 91, 92, 93, 94, 95, 96, 1997
+ Copyright (C) 1990, 91, 92, 93, 94, 95, 96, 97, 98, 1999
Free Software Foundation, Inc.
Written by Cygnus Support.
CODE_FRAGMENT
.
+. {* This structure is used for a comdat section, as in PE. A comdat
+. section is associated with a particular symbol. When the linker
+. sees a comdat section, it keeps only one of the sections with a
+. given name and associated with a given symbol. *}
+.
+.struct bfd_comdat_info
+.{
+. {* The name of the symbol associated with a comdat section. *}
+. const char *name;
+.
+. {* The local symbol table index of the symbol associated with a
+. comdat section. This is only meaningful to the object file format
+. specific code; it is not an index into the list returned by
+. bfd_canonicalize_symtab. *}
+. long symbol;
+.
+. {* If this section is being discarded, the linker uses this field
+. to point to the input section which is being kept. *}
+. struct sec *sec;
+.};
+.
.typedef struct sec
.{
. {* The name of the section; the name isn't a copy, the pointer is
. {* This section should not be subject to garbage collection. *}
.#define SEC_KEEP 0x1000000
.
+. {* This section contains "short" data, and should be placed
+. "near" the GP. *}
+.#define SEC_SMALL_DATA 0x2000000
+.
+. {* This section contains data which may be shared with other
+. executables or shared objects. *}
+.#define SEC_SHARED 0x4000000
+.
. {* End of section flags. *}
.
. {* Some internal packed boolean fields. *}
.
. unsigned int lineno_count;
.
+. {* Optional information about a COMDAT entry; NULL if not COMDAT *}
+.
+. struct bfd_comdat_info *comdat;
+.
. {* When a section is being output, this value changes as more
. linenumbers are written out *}
.
. ((section->reloc_done) ? (section)->_cooked_size: (abort(),1))
*/
+/* We use a macro to initialize the static asymbol structures because
+ traditional C does not permit us to initialize a union member while
+ gcc warns if we don't initialize it. */
+ /* the_bfd, name, value, attr, section [, udata] */
+#ifdef __STDC__
+#define GLOBAL_SYM_INIT(NAME, SECTION) \
+ { 0, NAME, 0, BSF_SECTION_SYM, (asection *) SECTION, { 0 }}
+#else
+#define GLOBAL_SYM_INIT(NAME, SECTION) \
+ { 0, NAME, 0, BSF_SECTION_SYM, (asection *) SECTION }
+#endif
+
/* These symbols are global, not specific to any BFD. Therefore, anything
that tries to change them is broken, and should be repaired. */
+
static const asymbol global_syms[] =
{
- /* the_bfd, name, value, attr, section [, udata] */
- {0, BFD_COM_SECTION_NAME, 0, BSF_SECTION_SYM, (asection *) &bfd_com_section},
- {0, BFD_UND_SECTION_NAME, 0, BSF_SECTION_SYM, (asection *) &bfd_und_section},
- {0, BFD_ABS_SECTION_NAME, 0, BSF_SECTION_SYM, (asection *) &bfd_abs_section},
- {0, BFD_IND_SECTION_NAME, 0, BSF_SECTION_SYM, (asection *) &bfd_ind_section},
+ GLOBAL_SYM_INIT (BFD_COM_SECTION_NAME, &bfd_com_section),
+ GLOBAL_SYM_INIT (BFD_UND_SECTION_NAME, &bfd_und_section),
+ GLOBAL_SYM_INIT (BFD_ABS_SECTION_NAME, &bfd_abs_section),
+ GLOBAL_SYM_INIT (BFD_IND_SECTION_NAME, &bfd_ind_section)
};
#define STD_SECTION(SEC, FLAGS, SYM, NAME, IDX) \
const asymbol * const SYM = (asymbol *) &global_syms[IDX]; \
const asection SEC = \
- { NAME, 0, 0, FLAGS, 0, 0, 0, 0, 0, 0, 0, 0, 0, (asection *) &SEC, \
- 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, \
- (asymbol *) &global_syms[IDX], (asymbol **) &SYM, 0, 0 }
+ /* name, index, next, flags, set_vma, reloc_done, linker_mark, gc_mark */ \
+ { NAME, 0, 0, FLAGS, 0, 0, 0, 0, \
+ \
+ /* vma, lma, _cooked_size, _raw_size, output_offset, output_section, */ \
+ 0, 0, 0, 0, 0, (struct sec *) &SEC, \
+ \
+ /* alig..., reloc..., orel..., reloc_count, filepos, rel_..., line_... */ \
+ 0, 0, 0, 0, 0, 0, 0, \
+ \
+ /* userdata, contents, lineno, lineno_count */ \
+ 0, 0, 0, 0, \
+ \
+ /* comdat_info, moving_line_filepos, target_index, used_by_bfd, */ \
+ NULL, 0, 0, 0, \
+ \
+ /* cons..., owner, symbol */ \
+ 0, 0, (struct symbol_cache_entry *) &global_syms[IDX], \
+ \
+ /* symbol_ptr_ptr, link_order_head, ..._tail */ \
+ (struct symbol_cache_entry **) &SYM, 0, 0 \
+ }
STD_SECTION (bfd_com_section, SEC_IS_COMMON, bfd_com_symbol,
BFD_COM_SECTION_NAME, 0);
newsect->reloc_count = 0;
newsect->line_filepos = 0;
newsect->owner = abfd;
+ newsect->comdat = NULL;
/* Create a symbol whos only job is to point to this section. This is
useful for things like relocs which are relative to the base of a
/*ARGSUSED*/
boolean
bfd_set_section_flags (abfd, section, flags)
- bfd *abfd;
+ bfd *abfd ATTRIBUTE_UNUSED;
sec_ptr section;
flagword flags;
{
break;
}
- /* If the output section is empty, remove it too. */
- if (!os->link_order_head)
+ /* If the output section is empty, remove it too. Careful about sections
+ that have been discarded in the link script -- they are mapped to
+ bfd_abs_section, which has no owner. */
+ if (!os->link_order_head && os->owner)
{
for (spp = &os->owner->sections; *spp; spp = &(*spp)->next)
if (*spp == os)
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