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/*
* Copyright (C) 2014 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) {
crash();
npe();
}
static void crash() {
boolean b = baz();
// Create many objects to starve registers.
Main foo1 = create();
Main foo2 = create();
Main foo3 = create();
Main foo4 = create();
foo1.otherField = null;
// On X86, we would force b to be in a byte register, which
// would generate moves. This code exposed a bug in the
// register allocator, where an input move was not just before
// the instruction itself, and its destination was overridden
// by another value.
foo1.field = b;
foo2.field = b;
foo3.field = b;
foo4.field = b;
foo1.lastField = b;
}
// Similar to `crash` but generated an NPE.
static void npe() {
boolean b = baz();
Main foo1 = create();
Main foo2 = create();
Main foo3 = create();
Main foo4 = create();
foo1.field = b;
foo2.field = b;
foo3.field = b;
foo4.field = b;
foo1.lastField = b;
}
static Main create() {
return new Main();
}
static boolean baz() {
return false;
}
boolean field;
Object otherField;
boolean lastField;
}
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