Create target sections for user-added symbol files.

Add the sections of the symbol files that are provided via
'add-symbol-file' to the set of current target sections.
User-added sections are removed upon notification of free_objfile
when their corresponding object file is deleted.

2013-10-29  Nicolas Blanc  <nicolas.blanc@intel.com>

	* exec.h (add_target_sections_of_objfile): New declaration.
	* exec.c (add_target_sections_of_objfile): New function.
	* symfile.c (add_symbol_file_command): Update current target sections.
	(symfile_free_objfile): New function.
	(_initialize_symfile): Register observer for free_objfile events.

Signed-off-by: Nicolas Blanc <nicolas.blanc@intel.com>

3 files changed, 69 insertions, 2 deletions

diff --git a/gdb/exec.c b/gdb/exec.c
index 758cdc1..187c412 100644
--- a/gdb/exec.c
+++ b/gdb/exec.c
@@ -438,6 +438,51 @@ add_target_sections (void *owner,
     }
 }
 
+/* Add the sections of OBJFILE to the current set of target sections.  */
+
+void
+add_target_sections_of_objfile (struct objfile *objfile)
+{
+  struct target_section_table *table = current_target_sections;
+  struct obj_section *osect;
+  int space;
+  unsigned count = 0;
+  struct target_section *ts;
+
+  if (objfile == NULL)
+    return;
+
+  /* Compute the number of sections to add.  */
+  ALL_OBJFILE_OSECTIONS (objfile, osect)
+    {
+      if (bfd_get_section_size (osect->the_bfd_section) == 0)
+	continue;
+      count++;
+    }
+
+  if (count == 0)
+    return;
+
+  space = resize_section_table (table, count);
+
+  ts = table->sections + space;
+
+  ALL_OBJFILE_OSECTIONS (objfile, osect)
+    {
+      if (bfd_get_section_size (osect->the_bfd_section) == 0)
+	continue;
+
+      gdb_assert (ts < table->sections + space + count);
+
+      ts->addr = obj_section_addr (osect);
+      ts->endaddr = obj_section_endaddr (osect);
+      ts->the_bfd_section = osect->the_bfd_section;
+      ts->owner = (void *) objfile;
+
+      ts++;
+    }
+}
+
 /* Remove all target sections owned by OWNER.
    OWNER must be the same value passed to add_target_sections.  */
 
diff --git a/gdb/exec.h b/gdb/exec.h
index 39d5ea5..d8ea389 100644
--- a/gdb/exec.h
+++ b/gdb/exec.h
@@ -27,6 +27,7 @@
 struct target_section;
 struct target_ops;
 struct bfd;
+struct objfile;
 
 extern struct target_ops exec_ops;
 
@@ -93,6 +94,11 @@ extern void add_target_sections (void *owner,
 				 struct target_section *sections,
 				 struct target_section *sections_end);
 
+/* Add the sections of OBJFILE to the current set of target sections.
+ * OBJFILE owns the new target sections.  */
+
+extern void add_target_sections_of_objfile (struct objfile *objfile);
+
 /* Prints info about all sections defined in the TABLE.  ABFD is
    special cased --- it's filename is omitted; if it is the executable
    file, its entry point is printed.  */
diff --git a/gdb/symfile.c b/gdb/symfile.c
index 0318466..e0a234c 100644
--- a/gdb/symfile.c
+++ b/gdb/symfile.c
@@ -57,6 +57,7 @@
 #include "stack.h"
 #include "gdb_bfd.h"
 #include "cli/cli-utils.h"
+#include "target.h"
 
 #include <sys/types.h>
 #include <fcntl.h>
@@ -2206,6 +2207,7 @@ add_symbol_file_command (char *args, int from_tty)
   int expecting_sec_name = 0;
   int expecting_sec_addr = 0;
   char **argv;
+  struct objfile *objf;
 
   struct sect_opt
   {
@@ -2332,8 +2334,10 @@ add_symbol_file_command (char *args, int from_tty)
   if (from_tty && (!query ("%s", "")))
     error (_("Not confirmed."));
 
-  symbol_file_add (filename, from_tty ? SYMFILE_VERBOSE : 0,
-                   section_addrs, flags);
+  objf = symbol_file_add (filename, from_tty ? SYMFILE_VERBOSE : 0,
+			  section_addrs, flags);
+
+  add_target_sections_of_objfile (objf);
 
   /* Getting new symbols may change our opinion about what is
      frameless.  */
@@ -3819,11 +3823,23 @@ symfile_find_segment_sections (struct objfile *objfile)
   free_symfile_segment_data (data);
 }
 
+/* Listen for free_objfile events.  */
+
+static void
+symfile_free_objfile (struct objfile *objfile)
+{
+  /* Remove the target sections of user-added objfiles.  */
+  if (objfile != 0 && objfile->flags & OBJF_USERLOADED)
+    remove_target_sections ((void *) objfile);
+}
+
 void
 _initialize_symfile (void)
 {
   struct cmd_list_element *c;
 
+  observer_attach_free_objfile (symfile_free_objfile);
+
   c = add_cmd ("symbol-file", class_files, symbol_file_command, _("\
 Load symbol table from executable file FILE.\n\
 The `file' command can also load symbol tables, as well as setting the file\n\