re PR fortran/61669 (Error recovery ICE)

PR fortran/61669
	* gfortran.h (struct gfc_namespace): Add OLD_DATA field.
	* decl.c (gfc_reject_data): New function.
	* parse.c *use_modules): Record roll-back point.
	(next_statement): Likewise.
	(reject_statement): Roll back to last accepted DATA.

	* gfortran.dg/pr61669.f90: New test.

Co-Authored-By: Jakub Jelinek <jakub@redhat.com>

From-SVN: r218757

gcc/fortran/ChangeLog

@@ -1,3 +1,12 @@
+2014-12-15  Steven Bosscher  <steven@gcc.gnu.org>
+
+	PR fortran/61669
+	* gfortran.h (struct gfc_namespace): Add OLD_DATA field.
+	* decl.c (gfc_reject_data): New function.
+	* parse.c *use_modules): Record roll-back point.
+	(next_statement): Likewise.
+	(reject_statement): Roll back to last accepted DATA.
+
 2014-12-15  Janus Weil  <janus@gcc.gnu.org>
 
 	PR fortran/63727

gcc/fortran/decl.c

@@ -178,6 +178,20 @@ gfc_free_data_all (gfc_namespace *ns)
     }
 }
 
+/* Reject data parsed since the last restore point was marked.  */
+
+void
+gfc_reject_data (gfc_namespace *ns)
+{
+  gfc_data *d;
+
+  while (ns->data && ns->data != ns->old_data)
+    {
+      d = ns->data->next;
+      free (ns->data);
+      ns->data = d;
+    }
+}
 
 static match var_element (gfc_data_variable *);
 

gcc/fortran/gfortran.h

@@ -1627,7 +1627,7 @@ typedef struct gfc_namespace
   gfc_st_label *st_labels;
   /* This list holds information about all the data initializers in
      this namespace.  */
-  struct gfc_data *data;
+  struct gfc_data *data, *old_data;
 
   gfc_charlen *cl_list, *old_cl_list;
 
@@ -2929,6 +2929,7 @@ void gfc_free_omp_namelist (gfc_omp_namelist *);
 void gfc_free_equiv (gfc_equiv *);
 void gfc_free_equiv_until (gfc_equiv *, gfc_equiv *);
 void gfc_free_data (gfc_data *);
+void gfc_reject_data (gfc_namespace *);
 void gfc_free_case_list (gfc_case *);
 
 /* matchexp.c -- FIXME too?  */

gcc/fortran/parse.c

@@ -119,6 +119,7 @@ use_modules (void)
   gfc_warning_check ();
   gfc_current_ns->old_cl_list = gfc_current_ns->cl_list;
   gfc_current_ns->old_equiv = gfc_current_ns->equiv;
+  gfc_current_ns->old_data = gfc_current_ns->data;
   last_was_use_stmt = false;
 }
 
@@ -1098,6 +1099,7 @@ next_statement (void)
 
   gfc_current_ns->old_cl_list = gfc_current_ns->cl_list;
   gfc_current_ns->old_equiv = gfc_current_ns->equiv;
+  gfc_current_ns->old_data = gfc_current_ns->data;
   for (;;)
     {
       gfc_statement_label = NULL;
@@ -2043,6 +2045,8 @@ reject_statement (void)
   gfc_free_equiv_until (gfc_current_ns->equiv, gfc_current_ns->old_equiv);
   gfc_current_ns->equiv = gfc_current_ns->old_equiv;
 
+  gfc_reject_data (gfc_current_ns);
+
   gfc_new_block = NULL;
   gfc_undo_symbols ();
   gfc_clear_warning ();

gcc/testsuite/ChangeLog

@@ -1,3 +1,9 @@
+2014-12-15  Steven Bosscher  <steven@gcc.gnu.org>
+	    Jakub Jelinek  <jakub@redhat.com>
+
+	PR fortran/61669
+	* gfortran.dg/pr61669.f90: New test.
+
 2014-12-15  Richard Biener  <rguenther@suse.de>
 
 	PR tree-optimization/64312

gcc/testsuite/gfortran.dg/pr61669.f90

@@ -0,0 +1,7 @@
+! { dg-do compile }
+      write (*,"(a)") char(12)
+      CHARACTER*80 A /"A"/      ! { dg-error "Unexpected data declaration statement" }
+      REAL*4 B                  ! { dg-error "Unexpected data declaration statement" }
+      write (*,"(a)") char(12)
+      DATA B / 0.02 /           ! { dg-warning "Obsolescent feature: DATA statement" }
+      END