8156073: 2-slot LiveStackFrame locals (long and double) are incorrect
Reviewed-by: coleenp, mchung
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import java.lang.reflect.Field;
import java.lang.reflect.Method;
import java.util.List;
import java.util.Set;
import java.util.stream.Collectors;
import java.lang.StackWalker.StackFrame;
public class LocalLongHelper {
static StackWalker sw;
static Method longValue;
static Method getLocals;
static Class<?> primitiveValueClass;
static Method primitiveSize;
static Method getMethodType;
static Field memberName;
static Field offset;
public static void main(String[] args) throws Throwable {
setupReflectionStatics();
new LocalLongHelper().longArg(0xC0FFEE, 0x1234567890ABCDEFL);
}
// locals[2] contains the unused slot of the long argument.
public long longArg(int i, long l) throws Throwable {
List<StackFrame> frames = sw.walk(s -> s.collect(Collectors.toList()));
Object[] locals = (Object[]) getLocals.invoke(frames.get(0));
if (8 == (int) primitiveSize.invoke(locals[2])) { // Only test 64-bit
long locals_2 = (long) longValue.invoke(locals[2]);
if (locals_2 != 0){
throw new RuntimeException("Expected locals_2 == 0");
}
}
return l; // Don't want l to become a dead var
}
private static void setupReflectionStatics() throws Throwable {
Class<?> liveStackFrameClass = Class.forName("java.lang.LiveStackFrame");
primitiveValueClass = Class.forName("java.lang.LiveStackFrame$PrimitiveSlot");
getLocals = liveStackFrameClass.getDeclaredMethod("getLocals");
getLocals.setAccessible(true);
longValue = primitiveValueClass.getDeclaredMethod("longValue");
longValue.setAccessible(true);
Class<?> stackFrameInfoClass = Class.forName("java.lang.StackFrameInfo");
memberName = stackFrameInfoClass.getDeclaredField("memberName");
memberName.setAccessible(true);
offset = stackFrameInfoClass.getDeclaredField("bci");
offset.setAccessible(true);
getMethodType = Class.forName("java.lang.invoke.MemberName").getDeclaredMethod("getMethodType");
getMethodType.setAccessible(true);
Class<?> extendedOptionClass = Class.forName("java.lang.StackWalker$ExtendedOption");
Method ewsNI = StackWalker.class.getDeclaredMethod("newInstance", Set.class, extendedOptionClass);
ewsNI.setAccessible(true);
Field f = extendedOptionClass.getDeclaredField("LOCALS_AND_OPERANDS");
f.setAccessible(true);
Object localsAndOperandsOption = f.get(null);
primitiveSize = primitiveValueClass.getDeclaredMethod("size");
primitiveSize.setAccessible(true);
sw = (StackWalker) ewsNI.invoke(null, java.util.Collections.emptySet(), localsAndOperandsOption);
}
}