tree.c (lang_safe_for_unsave): Remove.

        * tree.c (lang_safe_for_unsave): Remove.
        (unsafe_for_reeval): Transmute and rename from safe_for_unsave,
        allowing for two levels of unsafeness.  Remove lang hook.
        * tree.h: Update declarations.
        * calls.c (expand_call): Rename safe_for_reeval to try_tail_call.
        Create temporary VAR_DECLs to protect very unsafe_for_reeval trees.
        Always fail sibcalls when there are pending cleanups.

From-SVN: r32735

1 files changed, 4 insertions, 6 deletions

diff --git a/gcc/tree.h b/gcc/tree.h
index 61e7818..bc5225c 100644
--- a/gcc/tree.h
+++ b/gcc/tree.h
@@ -1963,12 +1963,10 @@ extern tree unsave_expr_now		PARAMS ((tree));
 extern void (*lang_unsave)              PARAMS ((tree *));
 extern void (*lang_unsave_expr_now)     PARAMS ((tree));
 
-/* If non-null, a language specific version of safe_for_unsave. */
-extern int (*lang_safe_for_unsave)	PARAMS ((tree));
-
-/* Return nonzero if it is safe to unsave EXPR, else return zero.
-   It is not safe to unsave EXPR if it contains any embedded RTL_EXPRs.  */
-extern int safe_for_unsave PARAMS ((tree));
+/* Return 0 if it is safe to evaluate EXPR multiple times,
+   return 1 if it is safe if EXPR is unsaved afterward, or
+   return 2 if it is completely unsafe.  */
+extern int unsafe_for_reeval PARAMS ((tree));
 
 /* Return 1 if EXP contains a PLACEHOLDER_EXPR; i.e., if it represents a size
    or offset that depends on a field within a record.