re PR fortran/91864 (ICE in gfc_check_do_variable, at fortran/parse.c:4405)

2019-09-28  Steven G. Kargl  <kargl@gcc.gnu.org>

	PR fortran/91864
	* gcc/fortran/io.c (match_io_element): An inquiry parameter cannot be
	read into.
	* gcc/fortran/match.c (gfc_match_allocate): An inquiry parameter 
	can be neither an allocate-object nor stat variable.
	(gfc_match_deallocate): An inquiry parameter cannot be deallocated.

2019-09-28  Steven G. Kargl  <kargl@gcc.gnu.org>

	PR fortran/91864
	* gcc/testsuite/gfortran.dg/pr91864.f90

From-SVN: r276253

3 files changed, 38 insertions, 2 deletions

diff --git a/gcc/fortran/ChangeLog b/gcc/fortran/ChangeLog
index 1c1997f..d5a17da 100644
--- a/gcc/fortran/ChangeLog
+++ b/gcc/fortran/ChangeLog
@@ -1,3 +1,12 @@
+2019-09-28  Steven G. Kargl  <kargl@gcc.gnu.org>
+
+	PR fortran/91864
+	* gcc/fortran/io.c (match_io_element): An inquiry parameter cannot be
+	read into.
+	* gcc/fortran/match.c (gfc_match_allocate): An inquiry parameter 
+	can be neither an allocate-object nor stat variable.
+	(gfc_match_deallocate): An inquiry parameter cannot be deallocated.
+
 2019-09-26  Alessandro Fanfarillo  <afanfa@gcc.gnu.org>
 
 	* trans-array.c (structure_alloc_comps):
diff --git a/gcc/fortran/io.c b/gcc/fortran/io.c
index bb64560..9ae06b1f 100644
--- a/gcc/fortran/io.c
+++ b/gcc/fortran/io.c
@@ -3657,7 +3657,17 @@ match_io_element (io_kind k, gfc_code **cpp)
     {
       m = gfc_match_variable (&expr, 0);
       if (m == MATCH_NO)
-	gfc_error ("Expected variable in READ statement at %C");
+	{
+	  gfc_error ("Expecting variable in READ statement at %C");
+	  m = MATCH_ERROR;
+	}
+
+      if (m == MATCH_YES && expr->expr_type == EXPR_CONSTANT)
+	{
+	  gfc_error ("Expecting variable or io-implied-do in READ statement "
+		   "at %L", &expr->where);
+	  m = MATCH_ERROR;
+	}
 
       if (m == MATCH_YES
 	  && expr->expr_type == EXPR_VARIABLE
@@ -3667,7 +3677,6 @@ match_io_element (io_kind k, gfc_code **cpp)
 		     &expr->where);
 	  m = MATCH_ERROR;
 	}
-
     }
   else
     {
diff --git a/gcc/fortran/match.c b/gcc/fortran/match.c
index 9b9dbf1..83b1189 100644
--- a/gcc/fortran/match.c
+++ b/gcc/fortran/match.c
@@ -4242,6 +4242,12 @@ gfc_match_allocate (void)
       if (m == MATCH_ERROR)
 	goto cleanup;
 
+      if (tail->expr->expr_type == EXPR_CONSTANT)
+	{
+	  gfc_error ("Unexpected constant at %C");
+	  goto cleanup;
+	}
+
       if (gfc_check_do_variable (tail->expr->symtree))
 	goto cleanup;
 
@@ -4374,6 +4380,12 @@ alloc_opt_list:
 	  tmp = NULL;
 	  saw_stat = true;
 
+	  if (stat->expr_type == EXPR_CONSTANT)
+	    {
+	      gfc_error ("STAT tag at %L cannot be a constant", &stat->where);
+	      goto cleanup;
+	    }
+
 	  if (gfc_check_do_variable (stat->symtree))
 	    goto cleanup;
 
@@ -4650,6 +4662,12 @@ gfc_match_deallocate (void)
       if (m == MATCH_NO)
 	goto syntax;
 
+      if (tail->expr->expr_type == EXPR_CONSTANT)
+	{
+	  gfc_error ("Unexpected constant at %C");
+	  goto cleanup;
+	}
+
       if (gfc_check_do_variable (tail->expr->symtree))
 	goto cleanup;