private void startFrame(final int offset, final int nLocal, final int nStack) {
		int n = 3 + nLocal + nStack;
		if (frame == null || frame.length < n) {
			frame = new int[n];
		}
		frame[0] = offset;
		frame[1] = nLocal;
		frame[2] = nStack;
		frameIndex = 3;
	}