From: Jakub Jelinek <jakub@redhat.com>
Date: Tue, 19 Jul 2011 19:29:57 +0000 (+0200)
Subject: backport: re PR c++/49165 (ICE on for-loop/throw combination)
X-Git-Tag: releases/gcc-4.4.7~315
X-Git-Url: http://git.ipfire.org/cgi-bin/gitweb.cgi?a=commitdiff_plain;h=29f4a2e03ace8f12ef482e8f5bf50cbc36410aa1;p=thirdparty%2Fgcc.git

backport: re PR c++/49165 (ICE on for-loop/throw combination)

	Backport from mainline
	2011-05-26  Jakub Jelinek  <jakub@redhat.com>

	PR c++/49165
	* gimplify.c (shortcut_cond_r): Don't special case
	COND_EXPRs if they have void type on one of their arms.

	* g++.dg/eh/cond5.C: New test.

From-SVN: r176483
---

diff --git a/gcc/ChangeLog b/gcc/ChangeLog
index 9b062d745c73..060ce609d111 100644
--- a/gcc/ChangeLog
+++ b/gcc/ChangeLog
@@ -1,6 +1,12 @@
 2011-07-19  Jakub Jelinek  <jakub@redhat.com>
 
 	Backport from mainline
+	2011-05-26  Jakub Jelinek  <jakub@redhat.com>
+
+	PR c++/49165
+	* gimplify.c (shortcut_cond_r): Don't special case
+	COND_EXPRs if they have void type on one of their arms.
+
 	2011-05-23  Jakub Jelinek  <jakub@redhat.com>
 
 	PR middle-end/48973
diff --git a/gcc/gimplify.c b/gcc/gimplify.c
index 94bae9c83f2c..631f54a00521 100644
--- a/gcc/gimplify.c
+++ b/gcc/gimplify.c
@@ -2570,13 +2570,18 @@ shortcut_cond_r (tree pred, tree *true_label_p, tree *false_label_p)
 			   false_label_p);
       append_to_statement_list (t, &expr);
     }
-  else if (TREE_CODE (pred) == COND_EXPR)
+  else if (TREE_CODE (pred) == COND_EXPR
+	   && !VOID_TYPE_P (TREE_TYPE (TREE_OPERAND (pred, 1)))
+	   && !VOID_TYPE_P (TREE_TYPE (TREE_OPERAND (pred, 2))))
     {
       /* As long as we're messing with gotos, turn if (a ? b : c) into
 	 if (a)
 	   if (b) goto yes; else goto no;
 	 else
-	   if (c) goto yes; else goto no;  */
+	   if (c) goto yes; else goto no;
+
+	 Don't do this if one of the arms has void type, which can happen
+	 in C++ when the arm is throw.  */
       expr = build3 (COND_EXPR, void_type_node, TREE_OPERAND (pred, 0),
 		     shortcut_cond_r (TREE_OPERAND (pred, 1), true_label_p,
 				      false_label_p),
diff --git a/gcc/testsuite/ChangeLog b/gcc/testsuite/ChangeLog
index 254103cd857e..c2d84e095444 100644
--- a/gcc/testsuite/ChangeLog
+++ b/gcc/testsuite/ChangeLog
@@ -1,6 +1,11 @@
 2011-07-19  Jakub Jelinek  <jakub@redhat.com>
 
 	Backport from mainline
+	2011-05-26  Jakub Jelinek  <jakub@redhat.com>
+
+	PR c++/49165
+	* g++.dg/eh/cond5.C: New test.
+
 	2011-05-23  Jakub Jelinek  <jakub@redhat.com>
 
 	PR middle-end/48973
diff --git a/gcc/testsuite/g++.dg/eh/cond5.C b/gcc/testsuite/g++.dg/eh/cond5.C
new file mode 100644
index 000000000000..3f0c59964f11
--- /dev/null
+++ b/gcc/testsuite/g++.dg/eh/cond5.C
@@ -0,0 +1,43 @@
+// PR c++/49165
+// { dg-do run }
+
+extern "C" void abort ();
+
+int
+foo (bool x, int y)
+{
+  if (y < 10 && (x ? true : throw 1))
+    y++;
+  if (y > 20 || (x ? true : throw 2))
+    y++;
+  return y;
+}
+
+int
+main ()
+{
+  if (foo (true, 0) != 2
+      || foo (true, 10) != 11
+      || foo (false, 30) != 31)
+    abort ();
+  try
+    {
+      foo (false, 0);
+      abort ();
+    }
+  catch (int i)
+    {
+      if (i != 1)
+	abort ();
+    }
+  try
+    {
+      foo (false, 10);
+      abort ();
+    }
+  catch (int i)
+    {
+      if (i != 2)
+	abort ();
+    }
+}