[PATCH 12/25] Make default_static_chain return NULL in non-static functions

[ams]

This patch allows default_static_chain to be called from the back-end without
it knowing if the function is static or not.  Or, to put it another way,
without duplicating the check everywhere it's used.

2018-09-05  Tom de Vries  <t...@codesourcery.com>

        gcc/
        * targhooks.c (default_static_chain): Return NULL in non-static
        functions.
---
 gcc/targhooks.c | 8 +++++++-
 1 file changed, 7 insertions(+), 1 deletion(-)


diff --git a/gcc/targhooks.c b/gcc/targhooks.c
index afd56f3..742cfbf 100644
--- a/gcc/targhooks.c
+++ b/gcc/targhooks.c
@@ -1021,8 +1021,14 @@ default_internal_arg_pointer (void)
 }
 
 rtx
-default_static_chain (const_tree ARG_UNUSED (fndecl_or_type), bool incoming_p)
+default_static_chain (const_tree fndecl_or_type, bool incoming_p)
 {
+  /* While this function won't be called by the middle-end when a static
+     chain isn't needed, it's also used throughout the backend so it's
+     easiest to keep this check centralized.  */
+  if (DECL_P (fndecl_or_type) && !DECL_STATIC_CHAIN (fndecl_or_type))
+    return NULL;
+
   if (incoming_p)
     {
 #ifdef STATIC_CHAIN_INCOMING_REGNUM