feat: expose module for zig build system

src/lib.zig

@@ -89,7 +89,7 @@ pub const Bus = struct {
 
         return .{
             .ptr = obj,
-            .vtab = &.{
+            .vtable = &.{
                 .read8 = impl.read8,
                 .read16 = impl.read16,
                 .read32 = impl.read32,
@@ -164,13 +164,44 @@ pub const Scheduler = struct {
     }
 };
 
+// ---
+// TESTING
+// ---
+
+const ExampleBus = struct {
+    _: u32 = 0, // Note: need this field so that the ptr align of *lib.ExampleBus != 0
+
+    pub fn read(self: *@This(), comptime T: type, address: u32) T {
+        _ = self;
+        _ = address;
+        return 0;
+    }
+
+    pub fn write(self: *@This(), comptime T: type, address: u32, value: T) void {
+        _ = self;
+        _ = value;
+        _ = address;
+    }
+};
+
+const ExampleScheduler = struct {
+    tick: u64 = 0,
+
+    pub fn now(self: *const @This()) u64 {
+        return self.tick;
+    }
+};
+
 test "create ARMv4T interface" {
-    var bus: Bus = .{ .ptr = undefined, .vtable = undefined };
-    var scheduler: Scheduler = .{ .ptr = undefined, .nowFn = undefined };
+    var bus_impl = ExampleBus{};
+    var scheduler_impl = ExampleScheduler{};
+
+    const bus_interface = Bus.init(&bus_impl);
+    const scheduler_interface = Scheduler.init(&scheduler_impl);
 
     var arm7tdmi = Arm7tdmi{
-        .sched = scheduler,
-        .bus = bus,
+        .sched = scheduler_interface,
+        .bus = bus_interface,
         .cpsr = .{ .raw = 0x0000_001F },
         .spsr = .{ .raw = 0x0000_0000 },
     };
@@ -182,12 +213,15 @@ test "create ARMv4T interface" {
 }
 
 test "create ARMv5TE interface" {
-    var bus: Bus = .{ .ptr = undefined, .vtable = undefined };
-    var scheduler: Scheduler = .{ .ptr = undefined, .nowFn = undefined };
+    var bus_impl = ExampleBus{};
+    var scheduler_impl = ExampleScheduler{};
 
-    var arm946es = Arm7tdmi{
-        .sched = scheduler,
-        .bus = bus,
+    const bus_interface = Bus.init(&bus_impl);
+    const scheduler_interface = Scheduler.init(&scheduler_impl);
+
+    var arm946es = Arm946es{
+        .sched = scheduler_interface,
+        .bus = bus_interface,
         .cpsr = .{ .raw = 0x0000_001F },
         .spsr = .{ .raw = 0x0000_0000 },
     };