public BitExtender() {
super("Bit Extender", Strings.getter("extenderComponent"));
setIconName("extender.gif");
setAttributes(
new Attribute[] {ATTR_IN_WIDTH, ATTR_OUT_WIDTH, ATTR_TYPE},
new Object[] {BitWidth.create(8), BitWidth.create(16), ATTR_TYPE.parse("sign")});
setFacingAttribute(StdAttr.FACING);
setKeyConfigurator(
JoinedConfigurator.create(
new BitWidthConfigurator(ATTR_OUT_WIDTH),
new BitWidthConfigurator(ATTR_IN_WIDTH, 1, Value.MAX_WIDTH, 0)));
setOffsetBounds(Bounds.create(-40, -20, 40, 40));
}
public Negator() {
super("Negator", __("negatorComponent"));
setAttributes(new Attribute[] {StdAttr.WIDTH}, new Object[] {BitWidth.create(8)});
setKeyConfigurator(new BitWidthConfigurator(StdAttr.WIDTH));
setOffsetBounds(Bounds.create(-40, -20, 40, 40));
setIconName("negator.svg");
Port[] ps = new Port[2];
ps[IN] = new Port(-40, 0, Port.INPUT, StdAttr.WIDTH);
ps[OUT] = new Port(0, 0, Port.OUTPUT, StdAttr.WIDTH);
ps[IN].setToolTip(__("negatorInputTip"));
ps[OUT].setToolTip(__("negatorOutputTip"));
setPorts(ps);
}
public class ALU extends ManagedComponent {
public static final ComponentFactory factory = new Factory();
private static class Factory extends AbstractComponentFactory {
private Factory() {}
public String getName() {
return "MIPS ALU";
}
public String getDisplayName() {
return "ALU";
}
public Component createComponent(Location loc, AttributeSet attrs) {
return new ALU(loc, attrs);
}
public Bounds getOffsetBounds(AttributeSet attrs) {
return Bounds.create(-30, -50, 60, 100);
}
public void paintIcon(ComponentDrawContext context, int x, int y, AttributeSet attrs) {
drawALUIcon(context, x, y);
}
}
public ALU(Location loc, AttributeSet attrs) {
super(loc, attrs, 5);
setEnd(0, loc.translate(-30, -30), BITWIDTH_32, 1);
setEnd(1, loc.translate(-30, 30), BITWIDTH_32, 1);
setEnd(2, loc.translate(-10, 40), BITWIDTH_4, 1);
setEnd(3, loc.translate(30, -20), BITWIDTH_1, 2);
setEnd(4, loc.translate(30, 0), BITWIDTH_32, 2);
setEnd(5, loc.translate(30, 20), BITWIDTH_1, 2);
}
public ComponentFactory getFactory() {
return factory;
}
public void propagate(CircuitState state) {
int A = state.getValue(getEndLocation(0)).toIntValue();
int B = state.getValue(getEndLocation(1)).toIntValue();
int op = state.getValue(getEndLocation(2)).toIntValue();
int ans = 0;
int overflow = 0;
int zero = 0;
switch (op) {
case 0x0:
// and
ans = A & B;
break;
case 0x1:
// or
ans = A | B;
break;
case 0x2:
// add
ans = A + B;
if ((A >= 0 && B >= 0 && ans < 0) || (A < 0 && B < 0 && ans >= 0)) {
overflow = 1;
}
break;
case 0x6:
// sub
ans = A - B;
if ((A >= 0 && B < 0 && ans < 0) || (A < 0 && B >= 0 && ans >= 0)) {
overflow = 1;
}
break;
case 0x7:
// slt
ans = (A < B) ? 0x1 : 0x0;
break;
case 0xC:
// nor
ans = ~(A | B);
break;
case 0x8:
// sll
ans = B << A;
break;
case 0x9:
// srl
ans = B >>> A;
break;
case 0xA:
// sra
ans = B >> A;
break;
}
if (ans == 0) {
zero = 1;
}
Value out = Value.createKnown(BITWIDTH_32, ans);
Value outZero = Value.createKnown(BITWIDTH_1, zero);
Value outOverflow = Value.createKnown(BITWIDTH_1, overflow);
state.setValue(getEndLocation(3), outZero, this, 4);
state.setValue(getEndLocation(4), out, this, 5);
state.setValue(getEndLocation(5), outOverflow, this, 4);
}
static void drawALUIcon(ComponentDrawContext context, int x, int y) {
Graphics g = context.getGraphics();
g.setColor(Color.BLACK);
int xp[] = {x, x + 15, x + 15, x, x, x + 3, x};
int yp[] = {y, y + 5, y + 10, y + 15, y + 10, y + 8, y + 6};
g.drawPolygon(xp, yp, 7);
}
static void drawALU(Graphics g, Bounds bds) {
int wid = bds.getWidth();
int ht = bds.getHeight();
int x0 = bds.getX();
int x1 = x0 + wid;
int y0 = bds.getY();
int y1 = y0 + ht;
int xp[] = {x0, x1, x1, x0, x0, x0 + 20, x0};
int yp[] = {y0, y0 + 30, y1 - 30, y1, y1 - 40, y1 - 50, y1 - 60};
GraphicsUtil.switchToWidth(g, 2);
g.drawPolygon(xp, yp, 7);
}
public void draw(ComponentDrawContext context) {
drawALU(context.getGraphics(), getBounds());
context.drawPin(this, 0, "A", Direction.EAST);
context.drawPin(this, 1, "B", Direction.EAST);
context.drawPin(this, 3, "Zero", Direction.WEST);
context.drawPin(this, 4, "Res", Direction.WEST);
context.drawPin(this, 5, " OF ", Direction.WEST);
context.getGraphics().setColor(Color.GRAY);
context.drawPin(this, 2, "Op", Direction.SOUTH);
context.getGraphics().setColor(Color.BLACK);
}
private static final BitWidth BITWIDTH_32 = BitWidth.create(32);
private static final BitWidth BITWIDTH_4 = BitWidth.create(4);
private static final BitWidth BITWIDTH_1 = BitWidth.create(1);
}
public Port(int dx, int dy, String type, int bits, String exclude) {
this(dx, dy, type, BitWidth.create(bits), exclude);
}
public Port(int dx, int dy, String type, int bits) {
this(dx, dy, type, BitWidth.create(bits), defaultExclusive(type));
}