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Diffstat (limited to 'test/528-long-hint/src/Main.java')
-rw-r--r-- | test/528-long-hint/src/Main.java | 45 |
1 files changed, 45 insertions, 0 deletions
diff --git a/test/528-long-hint/src/Main.java b/test/528-long-hint/src/Main.java new file mode 100644 index 0000000000..ca1a114a7a --- /dev/null +++ b/test/528-long-hint/src/Main.java @@ -0,0 +1,45 @@ +/* + * Copyright (C) 2015 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. + */ + +import sun.misc.Unsafe; +import java.lang.reflect.Field; + +public class Main { + + long instanceField; + static long myLongField1; + static long myLongField2; + + public static void main(String[] args) throws Exception { + Unsafe unsafe = getUnsafe(); + Main f = new Main(); + long offset = unsafe.objectFieldOffset(Main.class.getDeclaredField("instanceField")); + getUnsafe(); // spill offset + long a = myLongField1; + // We used the hinted register for the low part of b, which is EBX, as requested + // by the intrinsic below. Allocating EBX for the low part, would put ESP as the high + // part, and we did not check that ESP was blocked. + long b = myLongField2; + unsafe.compareAndSwapLong(f, offset, a, b); + } + + + private static Unsafe getUnsafe() throws Exception { + Field f = Unsafe.class.getDeclaredField("theUnsafe"); + f.setAccessible(true); + return (Unsafe) f.get(null); + } +} |