text.love - Fork of lines.love without drawings; useful starting point for further forks

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//: Once a recipe is loaded, we need to run it.
//:
//: 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.

:(scenarios run)
:(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;
  size_t running_at;
  routine(recipe_number r) :running_recipe(r), running_at(0) {}
};

:(before "End Globals")
routine* Current_routine = NULL;

:(code)
void run(recipe_number r) {
  run(routine(r));
}

void run(routine rr) {
  Current_routine = &rr;
  while (!done(rr)) {
    vector<instruction>& instructions = steps(rr);
    size_t& pc = running_at(rr);
    // Running one instruction.
    if (instructions[pc].is_label) { ++pc; continue; }
//?     cout << "AAA " << Trace_stream << " ^" << Trace_stream->dump_layer << "$\n"; //? 1
    trace("run") << "instruction " << recipe_name(rr) << '/' << pc;
//?     cout << "operation " << instructions[pc].operation << '\n'; //? 3
//?     if (!instructions[pc].products.empty()) trace("foo") << "AAA product 0 is " << instructions[pc].products[0].to_string(); //? 1
    switch (instructions[pc].operation) {
      // Primitive Recipe Implementations
      case COPY: {
        trace("run") << "ingredient 0 is " << instructions[pc].ingredients[0].name;
        vector<int> data = read_memory(instructions[pc].ingredients[0]);
        write_memory(instructions[pc].products[0], data);
        break;
      }
      // End Primitive Recipe Implementations
      default: {
        cout << "not a primitive op: " << instructions[pc].operation << '\n';
      }
    }
    ++pc;
  }
  Current_routine = NULL;
}

//: 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 size_t& running_at(routine& rr) {
  return rr.running_at;
}

inline string recipe_name(routine& rr) {
  return Recipe[rr.running_recipe].name;
}

inline vector<instruction>& steps(routine& rr) {
  return Recipe[rr.running_recipe].steps;
}

inline bool done(routine& rr) {
  return running_at(rr) >= steps(rr).size();
}

:(before "End Main")
if (argc > 1) {
  setup();
  for (int i = 1; i < argc; ++i) {
    load(argv[i]);
  }

  Trace_stream = new trace_stream;
//?   Trace_stream->dump_layer = "all"; //? 2
  transform_all();
  recipe_number r = Recipe_number[string("main")];
  if (r) run(r);
  dump_memory();
}

:(code)
void load(string filename) {
  ifstream fin(filename.c_str());
  if (!fin) {
    raise << "no such file " << filename << '\n';
    return;
  }
  fin >> std::noskipws;
  add_recipes(fin);
  transform_all();
  fin.close();
}

//:: On startup, load everything in core.mu
:(before "End Load Recipes")
load("core.mu");
// freeze everything so it doesn't get cleared by tests
recently_added_recipes.clear();
recently_added_types.clear();

:(code)
// helper for tests
void run(string form) {
  vector<recipe_number> tmp = add_recipes(form);
  transform_all();
  run(tmp.front());
}

//:: Reading from memory, writing to memory.

vector<int> read_memory(reagent x) {
//?   cout << "read_memory: " << x.to_string() << '\n'; //? 1
  vector<int> result;
  if (isa_literal(x)) {
    result.push_back(x.value);
    return result;
  }
  int base = x.value;
  size_t size = size_of(x);
  for (size_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<int> data) {
  if (is_dummy(x)) return;
  int base = x.value;
  if (size_of(x) != data.size())
    raise << "size mismatch in storing to " << x.to_string() << '\n';
  for (size_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


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