Add ability to force lexed tokens' source_locations.

Use it to force BUILTINS_LOCATION when declaring builtins instead of creating a <built-in> entry in the line_table which is wrong.

	* c-opts.c (c_finish_options): Force BUILTINS_LOCATION for tokens
	defined in cpp_init_builtins and c_cpp_builtins.

	gcc/fortran/ChangeLog
	* cpp.c (gfc_cpp_init): Force BUILTINS_LOCATION for tokens
	defined in cpp_define_builtins.

	libcpp/ChangeLog
	* init.c (cpp_create_reader): Inititalize forced_token_location_p.
	* internal.h (struct cpp_reader): Add field forced_token_location_p.
	* lex.c (_cpp_lex_direct): Use forced_token_location_p.
	(cpp_force_token_locations): New.
	(cpp_stop_forcing_token_locations): New.

From-SVN: r177973

gcc/c-family/ChangeLog

+011-08-22  Gabriel Charette  <gchare@google.com>
+
+	* c-opts.c (c_finish_options): Force BUILTINS_LOCATION for tokens
+	defined in cpp_init_builtins and c_cpp_builtins.
+
 2011-08-19  Joseph Myers  <joseph@codesourcery.com>
 
 	* c-common.c (c_common_reswords): Add __builtin_complex.

gcc/c-family/c-opts.c

@@ -1306,13 +1306,18 @@ c_finish_options (void)
     {
       size_t i;
 
-      cb_file_change (parse_in,
-		      linemap_add (line_table, LC_RENAME, 0,
-				   _("<built-in>"), 0));
+      {
+	/* Make sure all of the builtins about to be declared have
+	  BUILTINS_LOCATION has their source_location.  */
+	source_location builtins_loc = BUILTINS_LOCATION;
+	cpp_force_token_locations (parse_in, &builtins_loc);
 
 	cpp_init_builtins (parse_in, flag_hosted);
 	c_cpp_builtins (parse_in);
 
+	cpp_stop_forcing_token_locations (parse_in);
+      }
+
       /* We're about to send user input to cpplib, so make it warn for
 	 things that we previously (when we sent it internal definitions)
 	 told it to not warn.

gcc/fortran/ChangeLog

+2011-08-22  Gabriel Charette  <gchare@google.com>
+
+	* cpp.c (gfc_cpp_init): Force BUILTINS_LOCATION for tokens
+	defined in cpp_define_builtins.
+
 2011-08-22  Mikael Morin  <mikael.morin@gcc.gnu.org>
 
 	PR fortran/50050

gcc/fortran/cpp.c

@@ -565,10 +565,18 @@ gfc_cpp_init (void)
   if (gfc_option.flag_preprocessed)
     return;
 
-  cpp_change_file (cpp_in, LC_RENAME, _("<built-in>"));
   if (!gfc_cpp_option.no_predefined)
+    {
+      /* Make sure all of the builtins about to be declared have
+	BUILTINS_LOCATION has their source_location.  */
+      source_location builtins_loc = BUILTINS_LOCATION;
+      cpp_force_token_locations (cpp_in, &builtins_loc);
+
       cpp_define_builtins (cpp_in);
 
+      cpp_stop_forcing_token_locations (cpp_in);
+    }
+
   /* Handle deferred options from command-line.  */
   cpp_change_file (cpp_in, LC_RENAME, _("<command-line>"));
 

libcpp/ChangeLog

+2011-08-22  Gabriel Charette  <gchare@google.com>
+
+	* init.c (cpp_create_reader): Inititalize forced_token_location_p.
+	* internal.h (struct cpp_reader): Add field forced_token_location_p.
+	* lex.c (_cpp_lex_direct): Use forced_token_location_p.
+	(cpp_force_token_locations): New.
+	(cpp_stop_forcing_token_locations): New.
+
 2011-08-18  Rainer Orth  <ro@CeBiTec.Uni-Bielefeld.DE>
 
 	PR libstdc++/1773

libcpp/include/cpplib.h

@@ -989,4 +989,8 @@ extern void cpp_prepare_state (cpp_reader *, struct save_macro_data **);
 extern int cpp_read_state (cpp_reader *, const char *, FILE *,
 			   struct save_macro_data *);
 
+/* In lex.c */
+extern void cpp_force_token_locations (cpp_reader *, source_location *);
+extern void cpp_stop_forcing_token_locations (cpp_reader *);
+
 #endif /* ! LIBCPP_CPPLIB_H */

libcpp/init.c

@@ -223,6 +223,9 @@ cpp_create_reader (enum c_lang lang, hash_table *table,
   /* Initialize table for push_macro/pop_macro.  */
   pfile->pushed_macros = 0;
 
+  /* Do not force token locations by default.  */
+  pfile->forced_token_location_p = NULL;
+
   /* The expression parser stack.  */
   _cpp_expand_op_stack (pfile);
 

libcpp/internal.h

@@ -499,6 +499,10 @@ struct cpp_reader
 
   /* List of saved macros by push_macro.  */
   struct def_pragma_macro *pushed_macros;
+
+  /* If non-null, the lexer will use this location for the next token
+     instead of getting a location from the linemap.  */
+  source_location *forced_token_location_p;
 };
 
 /* Character classes.  Based on the more primitive macros in safe-ctype.h.

libcpp/lex.c

@@ -1975,6 +1975,9 @@ _cpp_lex_direct (cpp_reader *pfile)
     }
   c = *buffer->cur++;
 
+  if (pfile->forced_token_location_p)
+    result->src_loc = *pfile->forced_token_location_p;
+  else
     result->src_loc = linemap_position_for_column (pfile->line_table,
 					  CPP_BUF_COLUMN (buffer, buffer->cur));
 
@@ -2839,3 +2842,21 @@ cpp_token_val_index (cpp_token *tok)
       return CPP_TOKEN_FLD_NONE;
     }
 }
+
+/* All tokens lexed in R after calling this function will be forced to have
+   their source_location the same as the location referenced by P, until
+   cpp_stop_forcing_token_locations is called for R.  */
+
+void
+cpp_force_token_locations (cpp_reader *r, source_location *p)
+{
+  r->forced_token_location_p = p;
+}
+
+/* Go back to assigning locations naturally for lexed tokens.  */
+
+void
+cpp_stop_forcing_token_locations (cpp_reader *r)
+{
+  r->forced_token_location_p = NULL;
+}