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author Hiroshi Yamauchi <yamauchi@google.com> 2016-02-11 21:39:41 +0000
committer Gerrit Code Review <noreply-gerritcodereview@google.com> 2016-02-11 21:39:41 +0000
commitd3caabd4f85f86dd744da432993e12935d843a83 (patch)
treeb7fb9f36c2725e78e0ba7f61fc8ff14c60666077 /test/573-checker-checkcast-regression/src/Main.java
parentd3df33e6c24e3cd62991b2a65833f16dc05a17b8 (diff)
parent86503785cd6414b8692e5c83cadaa2972b6a099b (diff)
Merge "Fix x86-64 Baker's read barrier fast path for CheckCast."
Diffstat (limited to 'test/573-checker-checkcast-regression/src/Main.java')
-rw-r--r--test/573-checker-checkcast-regression/src/Main.java49
1 files changed, 49 insertions, 0 deletions
diff --git a/test/573-checker-checkcast-regression/src/Main.java b/test/573-checker-checkcast-regression/src/Main.java
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+++ b/test/573-checker-checkcast-regression/src/Main.java
@@ -0,0 +1,49 @@
+/*
+ * Copyright (C) 2016 The Android Open Source Project
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ * http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+public class Main {
+
+ public static void main(String[] args) {
+ Object[] array = { new Integer(1), new Integer(2), new Integer(3) };
+ int result = test(array, 0, 2);
+ System.out.println(result);
+ }
+
+ // This test method uses two integers (`index1` and `index2`) to
+ // force the register allocator to use some high registers (R8-R15)
+ // on x86-64 in the code generated for the first CheckCast (which
+ // converts `new_array` to an `Object[]`), so as to produce code
+ // containing a conditional jump whose offset does not fit in a
+ // NearLabel when using Baker's read barrier fast path (because
+ // x86-64 instructions using these high registers have a larger
+ // encoding).
+ //
+ // The intent of this artifical constraint is to ensure the initial
+ // failure is properly tested by this regression test.
+
+ /// CHECK-START: int Main.test(java.lang.Object, int, int) register (after)
+ /// CHECK-DAG: CheckCast check_kind:array_object_check
+ /// CHECK-DAG: CheckCast check_kind:exact_check
+ /// CHECK-DAG: CheckCast check_kind:exact_check
+
+ static public int test(Object new_array, int index1, int index2) {
+ Object[] objectArray = (Object[]) new_array;
+ Integer integer1 = (Integer) objectArray[index1];
+ Integer integer2 = (Integer) objectArray[index2];
+ return integer1.intValue() + integer2.intValue();
+ }
+
+}