+/* Append a copy of data (cast to char *) to list. */
+
+static void
+dll_name_list_append (dll_name_list_type * list, bfd_byte * data)
+{
+ /* Error checking. */
+ if (! list || ! list->tail)
+ return;
+
+ /* Allocate new node. */
+ dll_name_list_node_type * entry =
+ (dll_name_list_node_type *) xmalloc (sizeof (dll_name_list_node_type));
+
+ /* Initialize its values. */
+ entry->dllname = xstrdup ((char *) data);
+ entry->next = NULL;
+
+ /* Add to tail, and move tail. */
+ list->tail->next = entry;
+ list->tail = entry;
+}
+
+/* Count the number of entries in list. */
+
+static int
+dll_name_list_count (dll_name_list_type * list)
+{
+ /* Error checking. */
+ if (! list || ! list->head)
+ return 0;
+
+ int count = 0;
+ dll_name_list_node_type * p = list->head;
+
+ while (p && p->next)
+ {
+ count++;
+ p = p->next;
+ }
+ return count;
+}
+
+/* Print each entry in list to stdout. */
+
+static void
+dll_name_list_print (dll_name_list_type * list)
+{
+ /* Error checking. */
+ if (! list || ! list->head)
+ return;
+
+ dll_name_list_node_type * p = list->head;
+
+ while (p && p->next && p->next->dllname && *(p->next->dllname))
+ {
+ printf ("%s\n", p->next->dllname);
+ p = p->next;
+ }
+}
+
+/* Free all entries in list, and list itself. */
+
+static void
+dll_name_list_free (dll_name_list_type * list)
+{
+ if (list)
+ {
+ dll_name_list_free_contents (list->head);
+ list->head = NULL;
+ list->tail = NULL;
+ free (list);
+ }
+}
+
+/* Recursive function to free all nodes entry->next->next...
+ as well as entry itself. */
+
+static void
+dll_name_list_free_contents (dll_name_list_node_type * entry)
+{
+ if (entry)
+ {
+ if (entry->next)
+ {
+ dll_name_list_free_contents (entry->next);
+ entry->next = NULL;
+ }
+ if (entry->dllname)
+ {
+ free (entry->dllname);
+ entry->dllname = NULL;
+ }
+ free (entry);
+ }
+}
+
+/* Allocate and initialize a dll_name_list_type object,
+ including its sentinel node. Caller is responsible
+ for calling dll_name_list_free when finished with
+ the list. */
+
+static dll_name_list_type *
+dll_name_list_create (void)
+{
+ /* Allocate list. */
+ dll_name_list_type * list = xmalloc (sizeof (dll_name_list_type));
+
+ /* Allocate and initialize sentinel node. */
+ list->head = xmalloc (sizeof (dll_name_list_node_type));
+ list->head->dllname = NULL;
+ list->head->next = NULL;
+
+ /* Bookkeeping for empty list. */
+ list->tail = list->head;
+
+ return list;
+}
+
+/* Search the symbol table of the suppled BFD for a symbol whose name matches
+ OBJ (where obj is cast to const char *). If found, set global variable
+ identify_member_contains_symname_result TRUE. It is the caller's
+ responsibility to set the result variable FALSE before iterating with
+ this function. */
+
+static void
+identify_member_contains_symname (bfd * abfd,
+ bfd * archive_bfd ATTRIBUTE_UNUSED,
+ void * obj)
+{
+ long storage_needed;
+ asymbol ** symbol_table;
+ long number_of_symbols;
+ long i;
+ symname_search_data_type * search_data = (symname_search_data_type *) obj;
+
+ /* If we already found the symbol in a different member,
+ short circuit. */
+ if (search_data->found)
+ return;
+
+ storage_needed = bfd_get_symtab_upper_bound (abfd);
+ if (storage_needed <= 0)
+ return;
+
+ symbol_table = xmalloc (storage_needed);
+ number_of_symbols = bfd_canonicalize_symtab (abfd, symbol_table);
+ if (number_of_symbols < 0)
+ {
+ free (symbol_table);
+ return;
+ }
+
+ for (i = 0; i < number_of_symbols; i++)
+ {
+ if (strncmp (symbol_table[i]->name,
+ search_data->symname,
+ strlen (search_data->symname)) == 0)
+ {
+ search_data->found = TRUE;
+ break;
+ }
+ }
+ free (symbol_table);
+}
+
+/* This is the main implementation for the --identify option.
+ Given the name of an import library in identify_imp_name, first determine
+ if the import library is a GNU binutils-style one (where the DLL name is
+ stored in an .idata$7 (.idata$6 on PPC) section, or if it is a MS-style
+ one (where the DLL name, along with much other data, is stored in the
+ .idata$6 section). We determine the style of import library by searching
+ for the DLL-structure symbol inserted by MS tools:
+ __NULL_IMPORT_DESCRIPTOR.
+
+ Once we know which section to search, evaluate each section for the
+ appropriate properties that indicate it may contain the name of the
+ associated DLL (this differs depending on the style). Add the contents
+ of all sections which meet the criteria to a linked list of dll names.
+
+ Finally, print them all to stdout. (If --identify-strict, an error is
+ reported if more than one match was found). */
+
+static void
+identify_dll_for_implib (void)
+{
+ bfd * abfd = NULL;
+ int count = 0;
+ identify_data_type identify_data;
+ symname_search_data_type search_data;
+
+ /* Initialize identify_data. */
+ identify_data.list = dll_name_list_create ();
+ identify_data.ms_style_implib = FALSE;
+
+ /* Initialize search_data. */
+ search_data.symname = "__NULL_IMPORT_DESCRIPTOR";
+ search_data.found = FALSE;
+
+ bfd_init ();
+
+ abfd = bfd_openr (identify_imp_name, 0);
+ if (abfd == NULL)
+ bfd_fatal (identify_imp_name);
+
+ if (! bfd_check_format (abfd, bfd_archive))
+ {
+ if (! bfd_close (abfd))
+ bfd_fatal (identify_imp_name);
+
+ fatal (_("%s is not a library"), identify_imp_name);
+ }
+
+ /* Detect if this a Microsoft import library. */
+ identify_search_archive (abfd,
+ identify_member_contains_symname,
+ (void *)(& search_data));
+ if (search_data.found)
+ identify_data.ms_style_implib = TRUE;
+
+ /* Rewind the bfd. */
+ if (! bfd_close (abfd))
+ bfd_fatal (identify_imp_name);
+ abfd = bfd_openr (identify_imp_name, 0);
+ if (abfd == NULL)
+ bfd_fatal (identify_imp_name);
+
+ if (!bfd_check_format (abfd, bfd_archive))
+ {
+ if (!bfd_close (abfd))
+ bfd_fatal (identify_imp_name);
+
+ fatal (_("%s is not a library"), identify_imp_name);
+ }
+
+ /* Now search for the dll name. */
+ identify_search_archive (abfd,
+ identify_search_member,
+ (void *)(& identify_data));
+
+ if (! bfd_close (abfd))
+ bfd_fatal (identify_imp_name);
+
+ count = dll_name_list_count (identify_data.list);
+ if (count > 0)
+ {
+ if (identify_strict && count > 1)
+ {
+ dll_name_list_free (identify_data.list);
+ identify_data.list = NULL;
+ fatal (_("Import library `%s' specifies two or more dlls"),
+ identify_imp_name);
+ }
+ dll_name_list_print (identify_data.list);
+ dll_name_list_free (identify_data.list);
+ identify_data.list = NULL;
+ }
+ else
+ {
+ dll_name_list_free (identify_data.list);
+ identify_data.list = NULL;
+ fatal (_("Unable to determine dll name for `%s' (not an import library?)"),
+ identify_imp_name);
+ }
+}
+
+/* Loop over all members of the archive, applying the supplied function to
+ each member that is a bfd_object. The function will be called as if:
+ func (member_bfd, abfd, user_storage) */
+
+static void
+identify_search_archive (bfd * abfd,
+ void (* operation) (bfd *, bfd *, void *),
+ void * user_storage)
+{
+ bfd * arfile = NULL;
+ bfd * last_arfile = NULL;
+ char ** matching;
+
+ while (1)
+ {
+ arfile = bfd_openr_next_archived_file (abfd, arfile);
+
+ if (arfile == NULL)
+ {
+ if (bfd_get_error () != bfd_error_no_more_archived_files)
+ bfd_fatal (bfd_get_filename (abfd));
+ break;
+ }
+
+ if (bfd_check_format_matches (arfile, bfd_object, &matching))
+ (*operation) (arfile, abfd, user_storage);
+ else
+ {
+ bfd_nonfatal (bfd_get_filename (arfile));
+ free (matching);
+ }
+
+ if (last_arfile != NULL)
+ bfd_close (last_arfile);
+
+ last_arfile = arfile;
+ }
+
+ if (last_arfile != NULL)
+ {
+ bfd_close (last_arfile);
+ }
+}
+
+/* Call the identify_search_section() function for each section of this
+ archive member. */
+
+static void
+identify_search_member (bfd *abfd,
+ bfd *archive_bfd ATTRIBUTE_UNUSED,
+ void *obj)
+{
+ bfd_map_over_sections (abfd, identify_search_section, obj);
+}
+
+/* This predicate returns true if section->name matches the desired value.
+ By default, this is .idata$7 (.idata$6 on PPC, or if the import
+ library is ms-style). */
+
+static bfd_boolean
+identify_process_section_p (asection * section, bfd_boolean ms_style_implib)
+{
+ static const char * SECTION_NAME =
+#ifdef DLLTOOL_PPC
+ /* dllname is stored in idata$6 on PPC */
+ ".idata$6";
+#else
+ ".idata$7";
+#endif
+ static const char * MS_SECTION_NAME = ".idata$6";
+
+ const char * section_name =
+ (ms_style_implib ? MS_SECTION_NAME : SECTION_NAME);
+
+ if (strcmp (section_name, section->name) == 0)
+ return TRUE;
+ return FALSE;
+}
+
+/* If *section has contents and its name is .idata$7 (.data$6 on PPC or if
+ import lib ms-generated) -- and it satisfies several other constraints
+ -- then add the contents of the section to obj->list. */
+
+static void
+identify_search_section (bfd * abfd, asection * section, void * obj)
+{
+ bfd_byte *data = 0;
+ bfd_size_type datasize;
+ identify_data_type * identify_data = (identify_data_type *)obj;
+ bfd_boolean ms_style = identify_data->ms_style_implib;
+
+ if ((section->flags & SEC_HAS_CONTENTS) == 0)
+ return;
+
+ if (! identify_process_section_p (section, ms_style))
+ return;
+
+ /* Binutils import libs seem distinguish the .idata$7 section that contains
+ the DLL name from other .idata$7 sections by the absence of the
+ SEC_RELOC flag. */
+ if (!ms_style && ((section->flags & SEC_RELOC) == SEC_RELOC))
+ return;
+
+ /* MS import libs seem to distinguish the .idata$6 section
+ that contains the DLL name from other .idata$6 sections
+ by the presence of the SEC_DATA flag. */
+ if (ms_style && ((section->flags & SEC_DATA) == 0))
+ return;
+
+ if ((datasize = bfd_section_size (abfd, section)) == 0)
+ return;
+
+ data = (bfd_byte *) xmalloc (datasize + 1);
+ data[0] = '\0';
+
+ bfd_get_section_contents (abfd, section, data, 0, datasize);
+ data[datasize] = '\0';
+
+ /* Use a heuristic to determine if data is a dll name.
+ Possible to defeat this if (a) the library has MANY
+ (more than 0x302f) imports, (b) it is an ms-style
+ import library, but (c) it is buggy, in that the SEC_DATA
+ flag is set on the "wrong" sections. This heuristic might
+ also fail to record a valid dll name if the dllname uses
+ a multibyte or unicode character set (is that valid?).
+
+ This heuristic is based on the fact that symbols names in
+ the chosen section -- as opposed to the dll name -- begin
+ at offset 2 in the data. The first two bytes are a 16bit
+ little-endian count, and start at 0x0000. However, the dll
+ name begins at offset 0 in the data. We assume that the
+ dll name does not contain unprintable characters. */
+ if (data[0] != '\0' && ISPRINT (data[0])
+ && ((datasize < 2) || ISPRINT (data[1])))
+ dll_name_list_append (identify_data->list, data);
+
+ free (data);
+}
+
projects / deliverable / binutils-gdb.git / blobdiff