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-//: Phase 3: Start running a loaded and transformed recipe.
-//:
-//: So far we've seen recipes as lists of instructions, and instructions point
-//: at other recipes. To kick things off mu needs to know how to run certain
-//: 'primitive' recipes. That will then give the ability to run recipes
-//: containing these primitives.
-//:
-//: This layer defines a skeleton with just two primitive recipes: IDLE which
-//: does nothing, and COPY, which can copy numbers from one memory location to
-//: another. Later layers will add more primitives.
-
-:(scenario copy_literal)
-recipe main [
-  1:integer <- copy 23:literal
-]
-+run: instruction main/0
-+run: ingredient 0 is 23
-+mem: storing 23 in location 1
-
-:(scenario copy)
-recipe main [
-  1:integer <- copy 23:literal
-  2:integer <- copy 1:integer
-]
-+run: instruction main/1
-+run: ingredient 0 is 1
-+mem: location 1 is 23
-+mem: storing 23 in location 2
-
-:(before "End Types")
-// Book-keeping while running a recipe.
-//: Later layers will change this.
-struct routine {
-  recipe_number running_recipe;
-  index_t running_step_index;
-  routine(recipe_number r) :running_recipe(r), running_step_index(0) {}
-  bool completed() const;
-};
-
-:(before "End Globals")
-routine* Current_routine = NULL;
-
-:(code)
-void run(recipe_number r) {
-  routine rr(r);
-  Current_routine = &rr;
-  run_current_routine();
-}
-
-void run_current_routine()
-{  // curly on a separate line, because later layers will modify header
-  while (!Current_routine->completed())  // later layers will modify condition
-  {
-    // Running One Instruction.
-    if (current_instruction().is_label) { ++current_step_index(); continue; }
-    trace("run") << "instruction " << current_recipe_name() << '/' << current_step_index();
-    trace("run") << current_instruction().to_string();
-//?     cout << "operation " << current_instruction().operation << '\n'; //? 3
-    switch (current_instruction().operation) {
-      // Primitive Recipe Implementations
-      case COPY: {
-        trace("run") << "ingredient 0 is " << current_instruction().ingredients[0].name;
-        vector<long long int> data = read_memory(current_instruction().ingredients[0]);
-        write_memory(current_instruction().products[0], data);
-        break;
-      }
-      // End Primitive Recipe Implementations
-      default: {
-        cout << "not a primitive op: " << current_instruction().operation << '\n';
-      }
-    }
-    ++current_step_index();
-  }
-}
-
-//: Some helpers.
-//: We'll need to override these later as we change the definition of routine.
-//: Important that they return referrences into the routine.
-
-inline index_t& current_step_index() {
-  return Current_routine->running_step_index;
-}
-
-inline const string& current_recipe_name() {
-  return Recipe[Current_routine->running_recipe].name;
-}
-
-inline const instruction& current_instruction() {
-  return Recipe[Current_routine->running_recipe].steps[Current_routine->running_step_index];
-}
-
-inline bool routine::completed() const {
-  return running_step_index >= Recipe[running_recipe].steps.size();
-}
-
-:(before "End Commandline Parsing")
-if (argc > 1) {
-  for (int i = 1; i < argc; ++i) {
-    load_permanently(argv[i]);
-  }
-}
-
-:(before "End Main")
-if (!Run_tests) {
-  setup();
-  Trace_stream = new trace_stream;
-//?   Trace_stream->dump_layer = "all"; //? 2
-  transform_all();
-  recipe_number r = Recipe_number[string("main")];
-//?   Trace_stream->dump_layer = "all"; //? 1
-  if (r) run(r);
-//?   dump_memory(); //? 1
-  teardown();
-}
-
-:(code)
-void load_permanently(string filename) {
-  ifstream fin(filename.c_str());
-  if (!fin) {
-    raise << "no such file " << filename << '\n';
-    return;
-  }
-  fin >> std::noskipws;
-  load(fin);
-  transform_all();
-  fin.close();
-  // freeze everything so it doesn't get cleared by tests
-  recently_added_recipes.clear();
-  recently_added_types.clear();
-}
-
-//:: On startup, load everything in core.mu
-:(before "End Load Recipes")
-load_permanently("core.mu");
-
-:(code)
-// helper for tests
-void run(string form) {
-  vector<recipe_number> tmp = load(form);
-  if (tmp.empty()) return;
-  transform_all();
-  run(tmp.front());
-}
-
-//:: Reading from memory, writing to memory.
-
-vector<long long int> read_memory(reagent x) {
-//?   cout << "read_memory: " << x.to_string() << '\n'; //? 1
-  vector<long long int> result;
-  if (isa_literal(x)) {
-    result.push_back(x.value);
-    return result;
-  }
-  index_t base = x.value;
-  size_t size = size_of(x);
-  for (index_t offset = 0; offset < size; ++offset) {
-    int val = Memory[base+offset];
-    trace("mem") << "location " << base+offset << " is " << val;
-    result.push_back(val);
-  }
-  return result;
-}
-
-void write_memory(reagent x, vector<long long int> data) {
-  if (is_dummy(x)) return;
-  index_t base = x.value;
-  if (size_of(x) != data.size())
-    raise << "size mismatch in storing to " << x.to_string() << '\n';
-  for (index_t offset = 0; offset < data.size(); ++offset) {
-    trace("mem") << "storing " << data[offset] << " in location " << base+offset;
-    Memory[base+offset] = data[offset];
-  }
-}
-
-:(code)
-size_t size_of(const reagent& r) {
-  return size_of(r.types);
-}
-size_t size_of(const vector<type_number>& types) {
-  // End size_of(types) Cases
-  return 1;
-}
-
-bool is_dummy(const reagent& x) {
-  return x.name == "_";
-}
-
-bool isa_literal(const reagent& r) {
-  return r.types.size() == 1 && r.types[0] == 0;
-}
-
-:(scenario run_label)
-recipe main [
-  +foo
-  1:integer <- copy 23:literal
-  2:integer <- copy 1:integer
-]
-+run: instruction main/1
-+run: instruction main/2
--run: instruction main/0
-
-:(scenario run_dummy)
-recipe main [
-  _ <- copy 0:literal
-]
-+run: instruction main/0