TestDeoptInt.java

/*
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 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
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 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
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 * version 2 for more details (a copy is included in the LICENSE file that
 * accompanied this code).
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 * 2 along with this work; if not, write to the Free Software Foundation,
 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
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/**
 * @test
 * @bug 6769124
 * @summary int value might not be correctly decoded on deopt with c1 on 64 bit
 *
 * @run main/othervm -Xcomp
 *      -XX:CompileCommand=compileonly,compiler.c1.TestDeoptInt::m
 *      compiler.c1.TestDeoptInt
 */

package compiler.c1;

public class TestDeoptInt {

    static class A {
        volatile int vl;
        A(int v) {
            vl = v;
        }
    }

    static void m(int b) {
        A a = new A(10);
        int c;
        c = b + a.vl; //accessing volatile field of class not loaded at compile time forces a deopt
        if(c != 20) {
            System.out.println("a (= " + a.vl + ") + b (= " + b + ") = c (= " + c + ") != 20");
            throw new InternalError();
        }
    }

    public static void main(String[] args) {
        m(10);
    }

}