* objfiles.h (struct objfile): Add memebers `data' and `num_data'.

(register_objfile_data, set_objfile_data, objfile_data): New
prototypes.
* objfiles.c (objfile_alloc_data, objfile_free_data): New
prototypes.
(allocate_objfile): Call objfile_alloc_data.
(free_objfile): Call objfile_free_data.
(struct objfile_data): New.
(struct objfile_data_registration): New.
(struct objfile_data_registry): New.
(objfile_data_registry): New variable.
(register_objfile_data): New function.
(objfile_alloc_data, objfile_free_data): New functions.
(set_objfile_data, objfile_data): New functions.
* dwarf2-frame.c (dwarf2_frame_data): New variable.
(dwarf2_frame_find_fde, add_fde): Use new per-objfile data mechanism.
(_initialize_dwarf2_frame): New function and prototype.

1 files changed, 77 insertions, 0 deletions

diff --git a/gdb/objfiles.c b/gdb/objfiles.c
index 39f5623749d..ee4cdc4032c 100644
--- a/gdb/objfiles.c
+++ b/gdb/objfiles.c
@@ -34,6 +34,7 @@
 #include "target.h"
 #include "bcache.h"
 
+#include "gdb_assert.h"
 #include <sys/types.h>
 #include "gdb_stat.h"
 #include <fcntl.h>
@@ -61,6 +62,9 @@ static void *map_to_file (int);
 
 static void add_to_objfile_sections (bfd *, sec_ptr, void *);
 
+static void objfile_alloc_data (struct objfile *objfile);
+static void objfile_free_data (struct objfile *objfile);
+
 /* Externally visible variables that are owned by this module.
    See declarations in objfile.h for more info. */
 
@@ -302,6 +306,8 @@ allocate_objfile (bfd *abfd, int flags)
       terminate_minimal_symbol_table (objfile);
     }
 
+  objfile_alloc_data (objfile);
+
   /* Update the per-objfile information that comes from the bfd, ensuring
      that any data that is reference is saved in the per-objfile data
      region. */
@@ -561,6 +567,7 @@ free_objfile (struct objfile *objfile)
 
   if (objfile != NULL)
     {
+      objfile_free_data (objfile);
       if (objfile->name != NULL)
 	{
 	  xmfree (objfile->md, objfile->name);
@@ -1097,4 +1104,74 @@ is_in_import_list (char *name, struct objfile *objfile)
       return 1;
   return 0;
 }
+
+
+/* Keep a registry of per-objfile data-pointers required by other GDB
+   modules.  */
+
+struct objfile_data
+{
+  unsigned index;
+};
+
+struct objfile_data_registration
+{
+  struct objfile_data *data;
+  struct objfile_data_registration *next;
+};
+  
+struct objfile_data_registry
+{
+  struct objfile_data_registration *registrations;
+  unsigned num_registrations;
+};
+
+static struct objfile_data_registry objfile_data_registry = { NULL, 0 };
+
+const struct objfile_data *
+register_objfile_data (void)
+{
+  struct objfile_data_registration **curr;
+
+  /* Append new registration.  */
+  for (curr = &objfile_data_registry.registrations;
+       *curr != NULL; curr = &(*curr)->next);
 
+  *curr = XMALLOC (struct objfile_data_registration);
+  (*curr)->next = NULL;
+  (*curr)->data = XMALLOC (struct objfile_data);
+  (*curr)->data->index = objfile_data_registry.num_registrations++;
+
+  return (*curr)->data;
+}
+
+static void
+objfile_alloc_data (struct objfile *objfile)
+{
+  gdb_assert (objfile->data == NULL);
+  objfile->num_data = objfile_data_registry.num_registrations;
+  objfile->data = XCALLOC (objfile->num_data, void *);
+}
+
+static void
+objfile_free_data (struct objfile *objfile)
+{
+  gdb_assert (objfile->data != NULL);
+  xfree (objfile->data);
+  objfile->data = NULL;
+}
+
+void
+set_objfile_data (struct objfile *objfile, const struct objfile_data *data,
+		  void *value)
+{
+  gdb_assert (data->index < objfile->num_data);
+  objfile->data[data->index] = value;
+}
+
+void *
+objfile_data (struct objfile *objfile, const struct objfile_data *data)
+{
+  gdb_assert (data->index < objfile->num_data);
+  return objfile->data[data->index];
+}