Fix the use of linemap_add and remove unnecessary kludge

libcpp/

	* line-map.c (linemap_add): Assert that reason must not be
	LC_RENAME when called for the first time on a "main input file".

c-family/

	* c-pch.c (c_common_read_pch): Call linemap_add with LC_ENTER as it's
	the first time it's being called on this main TU.

gcc/lto/

	* lto-lang.c (lto_init): Likewise.  Also, avoid calling
	linemap_add twice.

gcc/fortran/

	* scanner.c (load_file): Don't abuse LC_RENAME reason while
	(indirectly) calling linemap_add.

From-SVN: r178146

gcc/c-family/ChangeLog

@@ -1,3 +1,8 @@
+2011-08-28  Dodji Seketeli  <dodji@redhat.com>
+
+	* c-pch.c (c_common_read_pch): Call linemap_add with LC_ENTER as
+	it's the first time it's being called on this main TU.
+
 2011-08-24  Richard Guenther  <rguenther@suse.de>
 
 	PR c/49396

gcc/c-family/c-pch.c

@@ -446,7 +446,7 @@ c_common_read_pch (cpp_reader *pfile, const char *name,
   fclose (f);
 
   line_table->trace_includes = saved_trace_includes;
-  linemap_add (line_table, LC_RENAME, 0, saved_loc.file, saved_loc.line);
+  linemap_add (line_table, LC_ENTER, 0, saved_loc.file, saved_loc.line);
 
   /* Give the front end a chance to take action after a PCH file has
      been loaded.  */

gcc/fortran/ChangeLog

@@ -1,3 +1,8 @@
+2011-08-28  Dodji Seketeli  <dodji@redhat.com>
+
+	* scanner.c (load_file): Don't abuse LC_RENAME reason while
+    	(indirectly) calling linemap_add.
+
 2011-08-26  Jakub Jelinek  <jakub@redhat.com>
 
 	* trans-decl.c (get_proc_pointer_decl): Set DECL_TLS_MODEL

gcc/fortran/scanner.c

@@ -1887,6 +1887,11 @@ load_file (const char *realfilename, const char *displayedname, bool initial)
   int len, line_len;
   bool first_line;
   const char *filename;
+  /* If realfilename and displayedname are different and non-null then
+     surely realfilename is the preprocessed form of
+     displayedname.  */
+  bool preprocessed_p = (realfilename && displayedname
+			 && strcmp (realfilename, displayedname));
 
   filename = displayedname ? displayedname : realfilename;
 
@@ -1925,9 +1930,24 @@ load_file (const char *realfilename, const char *displayedname, bool initial)
 	}
     }
 
-  /* Load the file.  */
+  /* Load the file.
 
-  f = get_file (filename, initial ? LC_RENAME : LC_ENTER);
+     A "non-initial" file means a file that is being included.  In
+     that case we are creating an LC_ENTER map.
+
+     An "initial" file means a main file; one that is not included.
+     That file has already got at least one (surely more) line map(s)
+     created by gfc_init.  So the subsequent map created in that case
+     must have LC_RENAME reason.
+
+     This latter case is not true for a preprocessed file.  In that
+     case, although the file is "initial", the line maps created by
+     gfc_init was used during the preprocessing of the file.  Now that
+     the preprocessing is over and we are being fed the result of that
+     preprocessing, we need to create a brand new line map for the
+     preprocessed file, so the reason is going to be LC_ENTER.  */
+
+  f = get_file (filename, (initial && !preprocessed_p) ? LC_RENAME : LC_ENTER);
   if (!initial)
     add_file_change (f->filename, f->inclusion_line);
   current_file = f;

gcc/lto/ChangeLog

@@ -1,3 +1,8 @@
+2011-08-28  Dodji Seketeli  <dodji@redhat.com>
+
+	* lto-lang.c (lto_init): Likewise.  Also, avoid calling
+	linemap_add twice.
+
 2011-08-11  Martin Jambor  <mjambor@suse.cz>
 
 	* lto.c (uniquify_nodes): Use main variant's BINFO too.

gcc/lto/lto-lang.c

@@ -1081,8 +1081,7 @@ lto_init (void)
   flag_generate_lto = flag_wpa;
 
   /* Initialize libcpp line maps for gcc_assert to work.  */
-  linemap_add (line_table, LC_RENAME, 0, NULL, 0);
-  linemap_add (line_table, LC_RENAME, 0, NULL, 0);
+  linemap_add (line_table, LC_ENTER, 0, NULL, 0);
 
   /* Create the basic integer types.  */
   build_common_tree_nodes (flag_signed_char, /*short_double=*/false);

libcpp/ChangeLog

@@ -1,3 +1,8 @@
+2011-08-28  Dodji Seketeli  <dodji@redhat.com>
+
+	* line-map.c (linemap_add): Assert that reason must not be
+	LC_RENAME when called for the first time on a "main input file".
+
 2011-08-22  Gabriel Charette  <gchare@google.com>
 
 	* init.c (cpp_create_reader): Inititalize forced_token_location_p.

libcpp/line-map.c

@@ -114,11 +114,10 @@ linemap_add (struct line_maps *set, enum lc_reason reason,
   if (reason == LC_RENAME_VERBATIM)
     reason = LC_RENAME;
 
-  /* If we don't keep our line maps consistent, we can easily
-     segfault.  Don't rely on the client to do it for us.  */
-  if (set->depth == 0)
-    reason = LC_ENTER;
-  else if (reason == LC_LEAVE)
+  if (set->depth == 0 && reason == LC_RENAME)
+    abort ();
+
+  if (reason == LC_LEAVE)
     {
       struct line_map *from;
       bool error;