From: Marek Polacek <polacek@redhat.com>
Date: Tue, 3 Dec 2013 12:11:36 +0000 (+0000)
Subject: re PR middle-end/56344 (ICE for program with very large structs returned by value)
X-Git-Tag: releases/gcc-4.9.0~2312
X-Git-Url: http://git.ipfire.org/?a=commitdiff_plain;h=ddc923b52d28df9ed6e5d50138593a31da3e519a;p=thirdparty%2Fgcc.git

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
---

diff --git a/gcc/ChangeLog b/gcc/ChangeLog
index de5799c1a36d..944e28cbbc4f 100644
--- a/gcc/ChangeLog
+++ b/gcc/ChangeLog
@@ -1,3 +1,9 @@
+2013-12-03  Marek Polacek  <polacek@redhat.com>
+
+	PR middle-end/56344
+	* calls.c (expand_call): Disallow passing huge arguments
+	by value.
+
 2013-12-03  Jakub Jelinek  <jakub@redhat.com>
 
 	PR tree-optimization/59362
diff --git a/gcc/calls.c b/gcc/calls.c
index 7d6327f28eff..3963bc297547 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)