From ddc923b52d28df9ed6e5d50138593a31da3e519a Mon Sep 17 00:00:00 2001
From: Marek Polacek <polacek@redhat.com>
Date: Tue, 3 Dec 2013 12:11:36 +0000
Subject: re PR middle-end/56344 (ICE for program with very large structs
 returned by value)

	PR middle-end/56344
	* calls.c (expand_call): Disallow passing huge arguments
	by value.

From-SVN: r205628
---
 gcc/calls.c | 9 +++++++++
 1 file changed, 9 insertions(+)

(limited to 'gcc/calls.c')

diff --git a/gcc/calls.c b/gcc/calls.c
index 7d6327f..3963bc2 100644
--- a/gcc/calls.c
+++ b/gcc/calls.c
@@ -3045,6 +3045,15 @@ expand_call (tree exp, rtx target, int ignore)
 	    {
 	      rtx before_arg = get_last_insn ();
 
+	      /* We don't allow passing huge (> 2^30 B) arguments
+	         by value.  It would cause an overflow later on.  */
+	      if (adjusted_args_size.constant
+		  >= (1 << (HOST_BITS_PER_INT - 2)))
+	        {
+	          sorry ("passing too large argument on stack");
+		  continue;
+		}
+
 	      if (store_one_arg (&args[i], argblock, flags,
 				 adjusted_args_size.var != 0,
 				 reg_parm_stack_space)
-- 
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