finish api setup, ready to connect

src/main.cpp

@@ -6,6 +6,10 @@
 #include "registerfile.h"
 #include "reservestation.h"
 #include "tools.h"
+template <int N>
+inline static void DirectWireConnect(dark::Register<N> &src, dark::Wire<N> &dest) {
+  dest.assign([&]() -> auto & { return src; });
+}
 int main(int argc, char **argv) {
   dark::CPU cpu;
   ZYM::CentralScheduleUnit csu;
@@ -15,6 +19,7 @@ int main(int argc, char **argv) {
   cpu.halt_signal.assign([&]() -> auto & { return csu.halt_signal; });
   memory.reset = [&]() { return cpu.GetResetSignal(); };
   memory.LoadProgram(std::cin);
+  csu.SetInstructionFetcher([&](auto addr) { return memory.FetchInstruction(addr); });
   std::cout << cpu.run(0, true) << std::endl;
   return 0;
 }