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- /* ldcref.c -- output a cross reference table
- Copyright (C) 1996 Free Software Foundation, Inc.
- Written by Ian Lance Taylor <ian@cygnus.com>
-
- This file is part of GLD, the Gnu Linker.
-
- This program is free software; you can redistribute it and/or modify
- it under the terms of the GNU General Public License as published by
- the Free Software Foundation; either version 2 of the License, or
- (at your option) any later version.
-
- This program is distributed in the hope that it will be useful,
- but WITHOUT ANY WARRANTY; without even the implied warranty of
- MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
- GNU General Public License for more details.
-
- You should have received a copy of the GNU General Public License
- along with this program; if not, write to the Free Software
- Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA. */
-
- /* This file holds routines that manage the cross reference table. */
-
- #include "bfd.h"
- #include "sysdep.h"
- #include "bfdlink.h"
- #include "libiberty.h"
-
- #include "ld.h"
- #include "ldmain.h"
- #include "ldmisc.h"
-
- /* We keep an instance of this structure for each reference to a
- symbol from a given object. */
-
- struct cref_ref
- {
- /* The next reference. */
- struct cref_ref *next;
- /* The object. */
- bfd *abfd;
- /* True if the symbol is defined. */
- unsigned int def : 1;
- /* True if the symbol is common. */
- unsigned int common : 1;
- /* True if the symbol is undefined. */
- unsigned int undef : 1;
- };
-
- /* We keep a hash table of symbols. Each entry looks like this. */
-
- struct cref_hash_entry
- {
- struct bfd_hash_entry root;
- /* The demangled name. */
- char *demangled;
- /* References to and definitions of this symbol. */
- struct cref_ref *refs;
- };
-
- /* This is what the hash table looks like. */
-
- struct cref_hash_table
- {
- struct bfd_hash_table root;
- };
-
- /* Local functions. */
-
- static struct bfd_hash_entry *cref_hash_newfunc
- PARAMS ((struct bfd_hash_entry *, struct bfd_hash_table *, const char *));
- static boolean cref_fill_array PARAMS ((struct cref_hash_entry *, PTR));
- static int cref_sort_array PARAMS ((const PTR, const PTR));
- static void output_one_cref PARAMS ((FILE *, struct cref_hash_entry *));
-
- /* Look up an entry in the cref hash table. */
-
- #define cref_hash_lookup(table, string, create, copy) \
- ((struct cref_hash_entry *) \
- bfd_hash_lookup (&(table)->root, (string), (create), (copy)))
-
- /* Traverse the cref hash table. */
-
- #define cref_hash_traverse(table, func, info) \
- (bfd_hash_traverse \
- (&(table)->root, \
- (boolean (*) PARAMS ((struct bfd_hash_entry *, PTR))) (func), \
- (info)))
-
- /* The cref hash table. */
-
- static struct cref_hash_table cref_table;
-
- /* Whether the cref hash table has been initialized. */
-
- static boolean cref_initialized;
-
- /* The number of symbols seen so far. */
-
- static size_t cref_symcount;
-
- /* Create an entry in a cref hash table. */
-
- static struct bfd_hash_entry *
- cref_hash_newfunc (entry, table, string)
- struct bfd_hash_entry *entry;
- struct bfd_hash_table *table;
- const char *string;
- {
- struct cref_hash_entry *ret = (struct cref_hash_entry *) entry;
-
- /* Allocate the structure if it has not already been allocated by a
- subclass. */
- if (ret == NULL)
- ret = ((struct cref_hash_entry *)
- bfd_hash_allocate (table, sizeof (struct cref_hash_entry)));
- if (ret == NULL)
- return (struct bfd_hash_entry *) ret;
-
- /* Call the allocation method of the superclass. */
- ret = ((struct cref_hash_entry *)
- bfd_hash_newfunc ((struct bfd_hash_entry *) ret, table, string));
- if (ret != NULL)
- {
- /* Set local fields. */
- ret->demangled = NULL;
- ret->refs = NULL;
-
- /* Keep a count of the number of entries created in the hash
- table. */
- ++cref_symcount;
- }
-
- return (struct bfd_hash_entry *) ret;
- }
-
- /* Add a symbol to the cref hash table. This is called for every
- symbol that is seen during the link. */
-
- /*ARGSUSED*/
- void
- add_cref (name, abfd, section, value)
- const char *name;
- bfd *abfd;
- asection *section;
- bfd_vma value;
- {
- struct cref_hash_entry *h;
- struct cref_ref *r;
-
- if (! cref_initialized)
- {
- if (! bfd_hash_table_init (&cref_table.root, cref_hash_newfunc))
- einfo ("%X%P: bfd_hash_table_init of cref table failed: %E\n");
- cref_initialized = true;
- }
-
- h = cref_hash_lookup (&cref_table, name, true, false);
- if (h == NULL)
- einfo ("%X%P: cref_hash_lookup failed: %E\n");
-
- for (r = h->refs; r != NULL; r = r->next)
- if (r->abfd == abfd)
- break;
-
- if (r == NULL)
- {
- r = (struct cref_ref *) xmalloc (sizeof *r);
- r->next = h->refs;
- h->refs = r;
- r->abfd = abfd;
- r->def = false;
- r->common = false;
- r->undef = false;
- }
-
- if (bfd_is_und_section (section))
- r->undef = true;
- else if (bfd_is_com_section (section))
- r->common = true;
- else
- r->def = true;
- }
-
- /* Copy the addresses of the hash table entries into an array. This
- is called via cref_hash_traverse. We also fill in the demangled
- name. */
-
- static boolean
- cref_fill_array (h, data)
- struct cref_hash_entry *h;
- PTR data;
- {
- struct cref_hash_entry ***pph = (struct cref_hash_entry ***) data;
-
- ASSERT (h->demangled == NULL);
- h->demangled = demangle (h->root.string);
-
- **pph = h;
-
- ++*pph;
-
- return true;
- }
-
- /* Sort an array of cref hash table entries by name. */
-
- static int
- cref_sort_array (a1, a2)
- const PTR a1;
- const PTR a2;
- {
- const struct cref_hash_entry **p1 = (const struct cref_hash_entry **) a1;
- const struct cref_hash_entry **p2 = (const struct cref_hash_entry **) a2;
-
- return strcmp ((*p1)->demangled, (*p2)->demangled);
- }
-
- /* Write out the cref table. */
-
- #define FILECOL (50)
-
- void
- output_cref (fp)
- FILE *fp;
- {
- int len;
- struct cref_hash_entry **csyms, **csym_fill, **csym, **csym_end;
-
- fprintf (fp, "\nCross Reference Table\n\n");
- fprintf (fp, "Symbol");
- len = sizeof "Symbol" - 1;
- while (len < FILECOL)
- {
- putc (' ' , fp);
- ++len;
- }
- fprintf (fp, "File\n");
-
- if (! cref_initialized)
- {
- fprintf (fp, "No symbols\n");
- return;
- }
-
- csyms = ((struct cref_hash_entry **)
- xmalloc (cref_symcount * sizeof (*csyms)));
-
- csym_fill = csyms;
- cref_hash_traverse (&cref_table, cref_fill_array, &csym_fill);
- ASSERT (csym_fill - csyms == cref_symcount);
-
- qsort (csyms, cref_symcount, sizeof (*csyms), cref_sort_array);
-
- csym_end = csyms + cref_symcount;
- for (csym = csyms; csym < csym_end; csym++)
- output_one_cref (fp, *csym);
- }
-
- /* Output one entry in the cross reference table. */
-
- static void
- output_one_cref (fp, h)
- FILE *fp;
- struct cref_hash_entry *h;
- {
- int len;
- struct bfd_link_hash_entry *hl;
- struct cref_ref *r;
-
- hl = bfd_link_hash_lookup (link_info.hash, h->root.string, false,
- false, true);
- if (hl == NULL)
- einfo ("%P: symbol `%T' missing from main hash table\n",
- h->root.string);
- else
- {
- /* If this symbol is defined in a dynamic object but never
- referenced by a normal object, then don't print it. */
- if (hl->type == bfd_link_hash_defined)
- {
- if (hl->u.def.section->output_section == NULL)
- return;
- if ((hl->u.def.section->owner->flags & DYNAMIC) != 0)
- {
- for (r = h->refs; r != NULL; r = r->next)
- if ((r->abfd->flags & DYNAMIC) == 0)
- break;
- if (r == NULL)
- return;
- }
- }
- }
-
- fprintf (fp, "%s ", h->demangled);
- len = strlen (h->demangled) + 1;
-
- for (r = h->refs; r != NULL; r = r->next)
- {
- if (r->def)
- {
- while (len < FILECOL)
- {
- putc (' ', fp);
- ++len;
- }
- finfo (fp, "%B\n", r->abfd);
- len = 0;
- }
- }
-
- for (r = h->refs; r != NULL; r = r->next)
- {
- if (! r->def)
- {
- while (len < FILECOL)
- {
- putc (' ', fp);
- ++len;
- }
- finfo (fp, "%B\n", r->abfd);
- len = 0;
- }
- }
-
- ASSERT (len == 0);
- }
-