From c8f5fc7032940ad6633f932ac40cade82ec4d0cc Mon Sep 17 00:00:00 2001
From: obrien <obrien@FreeBSD.org>
Date: Thu, 9 May 2002 20:02:13 +0000
Subject: Gcc 3.1.0 pre-release from the FSF anoncvs repo on 9-May-2002
 15:57:15 EDT.

---
 contrib/gcc/builtins.c | 90 ++++++++++++++++++++++++++++++++++----------------
 1 file changed, 62 insertions(+), 28 deletions(-)

(limited to 'contrib/gcc/builtins.c')

diff --git a/contrib/gcc/builtins.c b/contrib/gcc/builtins.c
index e3adb05..7eb878f7 100644
--- a/contrib/gcc/builtins.c
+++ b/contrib/gcc/builtins.c
@@ -2991,37 +2991,54 @@ rtx
 std_expand_builtin_va_arg (valist, type)
      tree valist, type;
 {
-  tree addr_tree, t;
-  HOST_WIDE_INT align;
-  HOST_WIDE_INT rounded_size;
+  tree addr_tree, t, type_size = NULL;
+  tree align, alignm1;
+  tree rounded_size;
   rtx addr;
 
   /* Compute the rounded size of the type.  */
-  align = PARM_BOUNDARY / BITS_PER_UNIT;
-  rounded_size = (((int_size_in_bytes (type) + align - 1) / align) * align);
+  align = size_int (PARM_BOUNDARY / BITS_PER_UNIT);
+  alignm1 = size_int (PARM_BOUNDARY / BITS_PER_UNIT - 1);
+  if (type == error_mark_node
+      || (type_size = TYPE_SIZE_UNIT (TYPE_MAIN_VARIANT (type))) == NULL
+      || TREE_OVERFLOW (type_size))
+    rounded_size = size_zero_node;
+  else
+    rounded_size = fold (build (MULT_EXPR, sizetype,
+				fold (build (TRUNC_DIV_EXPR, sizetype,
+					     fold (build (PLUS_EXPR, sizetype,
+							  type_size, alignm1)),
+					     align)),
+				align));
 
   /* Get AP.  */
   addr_tree = valist;
-  if (PAD_VARARGS_DOWN)
+  if (PAD_VARARGS_DOWN && ! integer_zerop (rounded_size))
     {
       /* Small args are padded downward.  */
-
-      HOST_WIDE_INT adj
-	= rounded_size > align ? rounded_size : int_size_in_bytes (type);
-
-      addr_tree = build (PLUS_EXPR, TREE_TYPE (addr_tree), addr_tree,
-			 build_int_2 (rounded_size - adj, 0));
+      addr_tree = fold (build (PLUS_EXPR, TREE_TYPE (addr_tree), addr_tree,
+			       fold (build (COND_EXPR, sizetype,
+					    fold (build (GT_EXPR, sizetype,
+							 rounded_size,
+							 align)),
+					    size_zero_node,
+					    fold (build (MINUS_EXPR, sizetype,
+							 rounded_size,
+							 type_size))))));
     }
 
   addr = expand_expr (addr_tree, NULL_RTX, Pmode, EXPAND_NORMAL);
   addr = copy_to_reg (addr);
 
   /* Compute new value for AP.  */
-  t = build (MODIFY_EXPR, TREE_TYPE (valist), valist,
-	     build (PLUS_EXPR, TREE_TYPE (valist), valist,
-		    build_int_2 (rounded_size, 0)));
-  TREE_SIDE_EFFECTS (t) = 1;
-  expand_expr (t, const0_rtx, VOIDmode, EXPAND_NORMAL);
+  if (! integer_zerop (rounded_size))
+    {
+      t = build (MODIFY_EXPR, TREE_TYPE (valist), valist,
+		 build (PLUS_EXPR, TREE_TYPE (valist), valist,
+			rounded_size));
+      TREE_SIDE_EFFECTS (t) = 1;
+      expand_expr (t, const0_rtx, VOIDmode, EXPAND_NORMAL);
+    }
 
   return addr;
 }
@@ -3064,7 +3081,7 @@ expand_builtin_va_arg (valist, type)
   else if ((promoted_type = (*lang_type_promotes_to) (type)) != NULL_TREE)
     {
       const char *name = "<anonymous type>", *pname = 0;
-      static int gave_help;
+      static bool gave_help;
 
       if (TYPE_NAME (type))
 	{
@@ -3083,13 +3100,24 @@ expand_builtin_va_arg (valist, type)
 	    pname = IDENTIFIER_POINTER (DECL_NAME (TYPE_NAME (promoted_type)));
 	}
 
-      error ("`%s' is promoted to `%s' when passed through `...'", name, pname);
+      /* Unfortunately, this is merely undefined, rather than a constraint
+	 violation, so we cannot make this an error.  If this call is never
+	 executed, the program is still strictly conforming.  */
+      warning ("`%s' is promoted to `%s' when passed through `...'",
+	       name, pname);
       if (! gave_help)
 	{
-	  gave_help = 1;
-	  error ("(so you should pass `%s' not `%s' to `va_arg')", pname, name);
+	  gave_help = true;
+	  warning ("(so you should pass `%s' not `%s' to `va_arg')",
+		   pname, name);
 	}
 
+      /* We can, however, treat "undefined" any way we please.
+	 Call abort to encourage the user to fix the program.  */
+      expand_builtin_trap ();
+
+      /* This is dead code, but go ahead and finish so that the
+	 mode of the result comes out right.  */
       addr = const0_rtx;
     }
   else
@@ -3541,6 +3569,18 @@ expand_builtin_expect_jump (exp, if_false_label, if_true_label)
 
   return ret;
 }
+
+void
+expand_builtin_trap ()
+{
+#ifdef HAVE_trap
+  if (HAVE_trap)
+    emit_insn (gen_trap ());
+  else
+#endif
+    emit_library_call (abort_libfunc, LCT_NORETURN, VOIDmode, 0);
+  emit_barrier ();
+}
 
 /* Expand an expression EXP that calls a built-in function,
    with result going to TARGET if that's convenient
@@ -3875,13 +3915,7 @@ expand_builtin (exp, target, subtarget, mode, ignore)
 	}
 
     case BUILT_IN_TRAP:
-#ifdef HAVE_trap
-      if (HAVE_trap)
-	emit_insn (gen_trap ());
-      else
-#endif
-	error ("__builtin_trap not supported by this target");
-      emit_barrier ();
+      expand_builtin_trap ();
       return const0_rtx;
 
     case BUILT_IN_PUTCHAR:
-- 
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