move the entry point info into the per-bfd object

This moves the entry point information into the per-BFD object and
arranges not to recompute it when it has already been computed.

2014-01-15  Tom Tromey  <tromey@redhat.com>

	* symfile.c (init_entry_point_info): Use new "initialized" field.
	Update.
	* objfiles.h (struct entry_point) <initialized>: New field.
	(struct objfile_per_bfd_storage) <ei>: New field, moved from...
	(struct objfile) <ei>: ...here.  Remove.
	* objfiles.c (entry_point_address_query): Update.

gdb/ChangeLog

@@ -1,3 +1,12 @@
+2014-01-15  Tom Tromey  <tromey@redhat.com>
+
+	* symfile.c (init_entry_point_info): Use new "initialized" field.
+	Update.
+	* objfiles.h (struct entry_point) <initialized>: New field.
+	(struct objfile_per_bfd_storage) <ei>: New field, moved from...
+	(struct objfile) <ei>: ...here.  Remove.
+	* objfiles.c (entry_point_address_query): Update.
+
 2014-01-15  Tom Tromey  <tromey@redhat.com>
 
 	* objfiles.c (entry_point_address_query): Relocate entry point

gdb/objfiles.c

@@ -364,12 +364,12 @@ get_objfile_arch (struct objfile *objfile)
 int
 entry_point_address_query (CORE_ADDR *entry_p)
 {
-  if (symfile_objfile == NULL || !symfile_objfile->ei.entry_point_p)
+  if (symfile_objfile == NULL || !symfile_objfile->per_bfd->ei.entry_point_p)
     return 0;
 
-  *entry_p = (symfile_objfile->ei.entry_point
+  *entry_p = (symfile_objfile->per_bfd->ei.entry_point
 	      + ANOFFSET (symfile_objfile->section_offsets,
-			  symfile_objfile->ei.the_bfd_section_index));
+			  symfile_objfile->per_bfd->ei.the_bfd_section_index));
 
   return 1;
 }

gdb/objfiles.h

@@ -109,6 +109,9 @@ struct entry_info
 
     /* Set to 1 iff ENTRY_POINT contains a valid value.  */
     unsigned entry_point_p : 1;
+
+    /* Set to 1 iff this object was initialized.  */
+    unsigned initialized : 1;
   };
 
 /* Sections in an objfile.  The section offsets are stored in the
@@ -195,6 +198,11 @@ struct objfile_per_bfd_storage
      name, and the second is the demangled name or just a zero byte
      if the name doesn't demangle.  */
   struct htab *demangled_names_hash;
+
+  /* The per-objfile information about the entry point, the scope (file/func)
+     containing the entry point, and the scope of the user's main() func.  */
+
+  struct entry_info ei;
 };
 
 /* Master structure for keeping track of each file from which
@@ -318,11 +326,6 @@ struct objfile
 
     const struct sym_fns *sf;
 
-    /* The per-objfile information about the entry point, the scope (file/func)
-       containing the entry point, and the scope of the user's main() func.  */
-
-    struct entry_info ei;
-
     /* Per objfile data-pointers required by other GDB modules.  */
 
     REGISTRY_FIELDS;

gdb/symfile.c

@@ -867,6 +867,12 @@ read_symbols (struct objfile *objfile, int add_flags)
 static void
 init_entry_point_info (struct objfile *objfile)
 {
+  struct entry_info *ei = &objfile->per_bfd->ei;
+
+  if (ei->initialized)
+    return;
+  ei->initialized = 1;
+
   /* Save startup file's range of PC addresses to help blockframe.c
      decide where the bottom of the stack is.  */
 
@@ -874,8 +880,8 @@ init_entry_point_info (struct objfile *objfile)
     {
       /* Executable file -- record its entry point so we'll recognize
          the startup file because it contains the entry point.  */
-      objfile->ei.entry_point = bfd_get_start_address (objfile->obfd);
-      objfile->ei.entry_point_p = 1;
+      ei->entry_point = bfd_get_start_address (objfile->obfd);
+      ei->entry_point_p = 1;
     }
   else if (bfd_get_file_flags (objfile->obfd) & DYNAMIC
 	   && bfd_get_start_address (objfile->obfd) != 0)
@@ -883,19 +889,19 @@ init_entry_point_info (struct objfile *objfile)
       /* Some shared libraries may have entry points set and be
 	 runnable.  There's no clear way to indicate this, so just check
 	 for values other than zero.  */
-      objfile->ei.entry_point = bfd_get_start_address (objfile->obfd);
-      objfile->ei.entry_point_p = 1;
+      ei->entry_point = bfd_get_start_address (objfile->obfd);
+      ei->entry_point_p = 1;
     }
   else
     {
       /* Examination of non-executable.o files.  Short-circuit this stuff.  */
-      objfile->ei.entry_point_p = 0;
+      ei->entry_point_p = 0;
     }
 
-  if (objfile->ei.entry_point_p)
+  if (ei->entry_point_p)
     {
       struct obj_section *osect;
-      CORE_ADDR entry_point =  objfile->ei.entry_point;
+      CORE_ADDR entry_point =  ei->entry_point;
       int found;
 
       /* Make certain that the address points at real code, and not a
@@ -907,7 +913,7 @@ init_entry_point_info (struct objfile *objfile)
 
       /* Remove any ISA markers, so that this matches entries in the
 	 symbol table.  */
-      objfile->ei.entry_point
+      ei->entry_point
 	= gdbarch_addr_bits_remove (get_objfile_arch (objfile), entry_point);
 
       found = 0;
@@ -919,7 +925,7 @@ init_entry_point_info (struct objfile *objfile)
 	      && entry_point < (bfd_get_section_vma (objfile->obfd, sect)
 				+ bfd_get_section_size (sect)))
 	    {
-	      objfile->ei.the_bfd_section_index
+	      ei->the_bfd_section_index
 		= gdb_bfd_section_index (objfile->obfd, sect);
 	      found = 1;
 	      break;
@@ -927,7 +933,7 @@ init_entry_point_info (struct objfile *objfile)
 	}
 
       if (!found)
-	objfile->ei.the_bfd_section_index = SECT_OFF_TEXT (objfile);
+	ei->the_bfd_section_index = SECT_OFF_TEXT (objfile);
     }
 }