re PR fortran/19262 (more than thirty-nine continuation lines should issue a std-warn)

2006-10-02  Jerry DeLisle  <jvdelisle@gcc.gnu.org>

    PR fortran/19262
    * gfortran.h (gfc_option_t): Add max_continue_fixed and max_continue_free.
    * options.c (gfc_init_options): Initialize fixed form and free form
    consecutive continuation line limits.
    * scanner.c (gfc_scanner_init_1): Initialize continue_line
    and continue_count. (gfc_next_char_literal): Count the number of
    continuation lines in the current statement and warn if
    limit is exceeded.

2006-10-02  Jerry DeLisle  <jvdelisle@gcc.gnu.org>

    PR fortran/19260
    * scanner.c (gfc_next_char_literal): Add check for missing '&'
    and warn if in_string, otherwise return ' '.

From-SVN: r117384

gcc/fortran/ChangeLog

+2006-10-02  Jerry DeLisle  <jvdelisle@gcc.gnu.org>
+
+    PR fortran/19262
+    * gfortran.h (gfc_option_t): Add max_continue_fixed and max_continue_free.
+    * options.c (gfc_init_options): Initialize fixed form and free form
+    consecutive continuation line limits.
+    * scanner.c (gfc_scanner_init_1): Initialize continue_line
+    and continue_count. (gfc_next_char_literal): Count the number of
+    continuation lines in the current statement and warn if
+    limit is exceeded.
+
+2006-10-02  Jerry DeLisle  <jvdelisle@gcc.gnu.org>
+
+    PR fortran/19260
+    * scanner.c (gfc_next_char_literal): Add check for missing '&'
+    and warn if in_string, otherwise return ' '.
+
 2006-10-02  Francois-Xavier Coudert  <coudert@clipper.ens.fr>
 
 	PR fortran/29210

gcc/fortran/gfortran.h

@@ -1613,6 +1613,8 @@ typedef struct
      emits a fatal error.  */
   int fixed_line_length; /* maximum line length in fixed-form.  */
   int free_line_length; /* maximum line length in free-form.  */
+  int max_continue_fixed;
+  int max_continue_free;
   int max_identifier_length;
   int verbose;
 

gcc/fortran/options.c

@@ -48,6 +48,8 @@ gfc_init_options (unsigned int argc ATTRIBUTE_UNUSED,
   gfc_option.source_form = FORM_UNKNOWN;
   gfc_option.fixed_line_length = -1;
   gfc_option.free_line_length = -1;
+  gfc_option.max_continue_fixed = 19;
+  gfc_option.max_continue_free = 39;
   gfc_option.max_identifier_length = GFC_MAX_SYMBOL_LEN;
   gfc_option.verbose = 0;
 
@@ -586,6 +588,8 @@ gfc_handle_option (size_t scode, const char *arg, int value)
       gfc_option.allow_std = GFC_STD_F95_OBS | GFC_STD_F77 
 	| GFC_STD_F2003 | GFC_STD_F95;
       gfc_option.warn_std = GFC_STD_F95_OBS;
+      gfc_option.max_continue_fixed = 255;
+      gfc_option.max_continue_free = 255;
       gfc_option.max_identifier_length = 63;
       gfc_option.warn_ampersand = 1;
       break;

gcc/fortran/scanner.c

@@ -61,6 +61,7 @@ static gfc_directorylist *include_dirs;
 static gfc_file *file_head, *current_file;
 
 static int continue_flag, end_flag, openmp_flag;
+static int continue_count, continue_line;
 static locus openmp_locus;
 
 gfc_source_form gfc_current_form;
@@ -71,6 +72,7 @@ const char *gfc_source_file;
 static FILE *gfc_src_file;
 static char *gfc_src_preprocessor_lines[2];
 
+extern int pedantic;
 
 /* Main scanner initialization.  */
 
@@ -81,6 +83,9 @@ gfc_scanner_init_1 (void)
   line_head = NULL;
   line_tail = NULL;
 
+  continue_count = 0;
+  continue_line = 0;
+
   end_flag = 0;
 }
 
@@ -585,7 +590,10 @@ gfc_next_char_literal (int in_string)
 restart:
   c = next_char ();
   if (gfc_at_end ())
-    return c;
+    {
+      continue_count = 0;
+      return c;
+    }
 
   if (gfc_current_form == FORM_FREE)
     {
@@ -644,8 +652,22 @@ restart:
       else
 	gfc_advance_line ();
 
-      /* We've got a continuation line and need to find where it continues.
-	 First eat any comment lines.  */
+      /* We've got a continuation line.  If we are on the very next line after
+	 the last continuation, increment the continuation line count and
+	 check whether the limit has been exceeded.  */
+      if (gfc_current_locus.lb->linenum == continue_line + 1)
+	{
+	  if (++continue_count == gfc_option.max_continue_free)
+	    {
+	      if (gfc_notification_std (GFC_STD_GNU)
+		  || pedantic)
+		gfc_warning ("Limit of %d continuations exceeded in statement at %C",
+			      gfc_option.max_continue_free);
+	    }
+	}
+      continue_line = gfc_current_locus.lb->linenum;
+
+      /* Now find where it continues. First eat any comment lines.  */
       gfc_skip_comments ();
 
       if (prev_openmp_flag != openmp_flag)
@@ -681,10 +703,18 @@ restart:
 
       if (c != '&')
 	{
-	  if (in_string && gfc_option.warn_ampersand)
-	    gfc_warning ("Missing '&' in continued character constant at %C");
-
-	  gfc_current_locus.nextc--;
+	  if (in_string)
+	    {
+	      if (gfc_option.warn_ampersand)
+		gfc_warning_now ("Missing '&' in continued character constant at %C");
+	      gfc_current_locus.nextc--;
+	    }
+	  else
+	    {
+	      c = ' ';
+	      gfc_current_locus = old_loc;
+	      goto done;
+	    }
 	}
     }
   else
@@ -738,6 +768,23 @@ restart:
       c = next_char ();
       if (c == '0' || c == ' ' || c == '\n')
 	goto not_continuation;
+
+      /* We've got a continuation line.  If we are on the very next line after
+	 the last continuation, increment the continuation line count and
+	 check whether the limit has been exceeded.  */
+      if (gfc_current_locus.lb->linenum == continue_line + 1)
+	{
+	  if (++continue_count == gfc_option.max_continue_fixed)
+	    {
+	      if (gfc_notification_std (GFC_STD_GNU)
+		  || pedantic)
+		gfc_warning ("Limit of %d continuations exceeded in statement at %C",
+			      gfc_option.max_continue_fixed);
+	    }
+	}
+
+      if (continue_line < gfc_current_locus.lb->linenum)
+	continue_line = gfc_current_locus.lb->linenum;
     }
 
   /* Ready to read first character of continuation line, which might
@@ -749,6 +796,8 @@ not_continuation:
   gfc_current_locus = old_loc;
 
 done:
+  if (c == '\n')
+    continue_count = 0;
   continue_flag = 0;
   return c;
 }