# HG changeset patch
# User iveresov
# Date 1418156738 28800
# Node ID b5eb829bbce1409d872d55124ffd2c017baebdeb
# Parent  b6585ac86988707bf5a01c5329b748413c35b908
8066900: Array Out Of Bounds Exception causes variable corruption
Summary: Fix FP registers save/restore during exception handling
Reviewed-by: kvn, vlivanov

diff -r b6585ac86988 -r b5eb829bbce1 src/cpu/x86/vm/c1_Runtime1_x86.cpp
--- a/src/cpu/x86/vm/c1_Runtime1_x86.cpp	Thu Dec 04 14:34:11 2014 +0100
+++ b/src/cpu/x86/vm/c1_Runtime1_x86.cpp	Tue Dec 09 12:25:38 2014 -0800
@@ -675,7 +675,7 @@
   case handle_exception_nofpu_id:
   case handle_exception_id:
     // At this point all registers MAY be live.
-    oop_map = save_live_registers(sasm, 1 /*thread*/, id == handle_exception_nofpu_id);
+    oop_map = save_live_registers(sasm, 1 /*thread*/, id != handle_exception_nofpu_id);
     break;
   case handle_exception_from_callee_id: {
     // At this point all registers except exception oop (RAX) and
@@ -748,7 +748,7 @@
   case handle_exception_nofpu_id:
   case handle_exception_id:
     // Restore the registers that were saved at the beginning.
-    restore_live_registers(sasm, id == handle_exception_nofpu_id);
+    restore_live_registers(sasm, id != handle_exception_nofpu_id);
     break;
   case handle_exception_from_callee_id:
     // WIN64_ONLY: No need to add frame::arg_reg_save_area_bytes to SP
diff -r b6585ac86988 -r b5eb829bbce1 test/compiler/exceptions/SumTest.java
--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/test/compiler/exceptions/SumTest.java	Tue Dec 09 12:25:38 2014 -0800
@@ -0,0 +1,86 @@
+/*
+ * Copyright (c) 2014, Oracle and/or its affiliates. All rights reserved.
+ * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
+ *
+ * This code is free software; you can redistribute it and/or modify it
+ * under the terms of the GNU General Public License version 2 only, as
+ * published by the Free Software Foundation.
+ *
+ * This code is distributed in the hope that it will be useful, but WITHOUT
+ * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
+ * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License
+ * version 2 for more details (a copy is included in the LICENSE file that
+ * accompanied this code).
+ *
+ * You should have received a copy of the GNU General Public License version
+ * 2 along with this work; if not, write to the Free Software Foundation,
+ * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
+ *
+ * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
+ * or visit www.oracle.com if you need additional information or have any
+ * questions.
+ */
+
+/*
+ * @test
+ * @bug 8066900
+ * @summary FP registers are not properly restored by C1 when handling exceptions
+ * @run main/othervm -Xbatch SumTest
+ *
+ */
+public class SumTest {
+    private static class Sum {
+
+        double[] sums;
+
+        /**
+         * Construct empty Sum
+         */
+        public Sum() {
+            sums = new double[0];
+        }
+
+        /**
+         * Return the sum of all numbers added to this Sum
+         *
+         * @return the sum
+         */
+        final public double getSum() {
+            double sum = 0;
+            for (final double s : sums) {
+                sum += s;
+            }
+
+            return sum;
+        }
+
+        /**
+         * Add a new number to this Sum
+         *
+         * @param a number to be added.
+         */
+        final public void add(double a) {
+            try {
+                sums[sums.length] = -1; // Cause IndexOutOfBoundsException
+            } catch (final IndexOutOfBoundsException e) {
+                final double[] oldSums = sums;
+                sums = new double[oldSums.length + 1]; // Extend sums
+                System.arraycopy(oldSums, 0, sums, 0, oldSums.length);
+                sums[oldSums.length] = a; // Append a
+            }
+        }
+    }
+
+    public static void main(String[] args) throws Exception {
+        final Sum sum = new Sum();
+        for (int i = 1; i <= 10000; ++i) {
+            sum.add(1);
+            double ii = sum.getSum();
+            if (i != ii) {
+                throw new Exception("Failure: computed = " + ii + ", expected = " + i);
+            }
+        }
+    }
+
+}
+