/** execute this method, which might be either bytecode or native. */
public Instruction execute(ThreadInfo ti) {
if (((attrs & MJI_NATIVE) != 0) || isNative()) {
NativePeer nativePeer = ci.getNativePeer();
if (nativePeer != null) {
JVM vm = ti.getVM();
StackFrame frame = new StackFrame(this, ti.getTopFrame());
// since there is no enter/leave for native methods, we have to do
// the notifications explicitly
ti.pushFrame(frame); // Make the logic easier in listeners (e.g. vm.getLastMethod() ==
// vm.getCurrentThread().getMethod())
vm.notifyMethodEntered(ti, this);
ti.popFrame(
false); // Can't keep the frame for later in this method since nativePeer.executeMethod
// will do work on the top of the stack
// <2do> Allow for the frame to remain on the stack for the duration of the call to
// nativePeer.executeMethod().
Instruction nextInsn = nativePeer.executeMethod(ti, this);
ti.pushFrame(frame); // Make the logic easier in listeners (e.g. vm.getLastMethod() ==
// vm.getCurrentThread().getMethod())
vm.notifyMethodExited(ti, this);
ti.popFrame(false); // Can't keep the frame since we don't want to leak frames.
return nextInsn;
} else {
return ti.createAndThrowException(
"java.lang.UnsatisfiedLinkError", ci.getName() + '.' + getUniqueName() + " (no peer)");
}
} else {
enter(ti);
return ti.getPC();
}
}
private void enter(ThreadInfo ti) {
if (isSynchronized()) {
ElementInfo ei = getBlockedObject(ti, true);
ei.lock(ti);
if (isStatic() && isClinit()) {
ci.setInitializing(ti);
}
}
StackFrame frame = new StackFrame(this, ti.getTopFrame());
ti.pushFrame(frame);
ti.getVM().notifyMethodEntered(ti, this);
}