jdk/test/java/lang/StackWalker/CountLocalSlots.java

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 * 2 along with this work; if not, write to the Free Software Foundation,
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/*
 * @test
 * @bug 8147039
 * @summary Confirm locals[] always has expected length, even for "dead" locals
 * @compile LocalsAndOperands.java
 * @run testng/othervm -Xcomp CountLocalSlots
 */

import org.testng.annotations.Test;
import java.lang.StackWalker.StackFrame;

public class CountLocalSlots {
    final static boolean debug = true;

    @Test(dataProvider = "provider", dataProviderClass = LocalsAndOperands.class)
    public void countLocalSlots(StackFrame... frames) {
        for (StackFrame frame : frames) {
            if (debug) {
                System.out.println("Running countLocalSlots");
                LocalsAndOperands.dumpStackWithLocals(frames);
            }
            // Confirm expected number of locals
            String methodName = frame.getMethodName();
            Integer expectedObj = (Integer) LocalsAndOperands.Tester.NUM_LOCALS.get(methodName);
            if (expectedObj == null) {
                if (!debug) { LocalsAndOperands.dumpStackWithLocals(frames); }
                throw new RuntimeException("No NUM_LOCALS entry for " +
                        methodName + "().  Update test?");
            }
            Object[] locals = (Object[]) LocalsAndOperands.invokeGetLocals(frame);
            if (locals.length != expectedObj) {
                if (!debug) { LocalsAndOperands.dumpStackWithLocals(frames); }
                throw new RuntimeException(methodName + "(): number of locals (" +
                        locals.length + ") did not match expected (" + expectedObj + ")");
            }
        }
    }
}