PR java/10459:

	* parse.y (finish_for_loop): Do nothing if update expression is a
	EXPR_WFL_NODE wrapping nothing.
	(java_complete_lhs) <COMPOUND_EXPR>: Likewise.

git-svn-id: svn+ssh://gcc.gnu.org/svn/gcc/trunk@66411 138bc75d-0d04-0410-961f-82ee72b054a4

diff --git a/gcc/java/ChangeLog b/gcc/java/ChangeLog
index 546e679..02e5075 100644 (file)
--- a/gcc/java/ChangeLog
+++ b/gcc/java/ChangeLog
@@ -1,3 +1,10 @@
+2003-05-01  Tom Tromey  <tromey@redhat.com>
+
+       PR java/10459:
+       * parse.y (finish_for_loop): Do nothing if update expression is a
+       EXPR_WFL_NODE wrapping nothing.
+       (java_complete_lhs) <COMPOUND_EXPR>: Likewise.
+
 2003-05-02  Nathan Sidwell  <nathan@codesourcery.com>
 
        * lex.h (input_lineno): Remove declaration.

diff --git a/gcc/java/parse.y b/gcc/java/parse.y
index c35d4e5..49fbc91 100644 (file)
--- a/gcc/java/parse.y
+++ b/gcc/java/parse.y
@@ -11771,7 +11771,9 @@ java_complete_lhs (tree node)
              nn = wfl_op2;
              if (TREE_CODE (nn) == EXPR_WITH_FILE_LOCATION)
                nn = EXPR_WFL_NODE (nn);
-             if (TREE_CODE (nn) != EXIT_EXPR)
+             /* NN can be NULL_TREE exactly when UPDATE is, in
+                finish_for_loop.  */
+             if (nn != NULL_TREE && TREE_CODE (nn) != EXIT_EXPR)
                {
                  SET_WFL_OPERATOR (wfl_operator, node, wfl_op2);
                  if (SUPPRESS_UNREACHABLE_ERROR (nn))
@@ -14928,12 +14930,17 @@ finish_for_loop (int location, tree condition, tree update, tree body)
       tree up2 = update;
       if (TREE_CODE (up2) == EXPR_WITH_FILE_LOCATION)
        up2 = EXPR_WFL_NODE (up2);
-      /* Try to detect constraint violations.  These would be
-        programming errors somewhere.  */
-      if (! IS_EXPR_CODE_CLASS (TREE_CODE_CLASS (TREE_CODE (up2)))
-         || TREE_CODE (up2) == LOOP_EXPR)
-       abort ();
-      SUPPRESS_UNREACHABLE_ERROR (up2) = 1;
+      /* It is possible for the update expression to be an
+        EXPR_WFL_NODE wrapping nothing.  */
+      if (up2 != NULL_TREE && up2 != empty_stmt_node)
+       {
+         /* Try to detect constraint violations.  These would be
+            programming errors somewhere.  */
+         if (! IS_EXPR_CODE_CLASS (TREE_CODE_CLASS (TREE_CODE (up2)))
+             || TREE_CODE (up2) == LOOP_EXPR)
+           abort ();
+         SUPPRESS_UNREACHABLE_ERROR (up2) = 1;
+       }
     }
   LOOP_EXPR_BODY_UPDATE_BLOCK (LOOP_EXPR_BODY (loop)) = update;
   return loop;