jak-project/decompiler/analysis/expression_build.cpp

#include "expression_build.h"
#include "decompiler/Function/Function.h"
#include "decompiler/IR2/Form.h"
#include "decompiler/IR2/FormStack.h"
#include "decompiler/util/DecompilerTypeSystem.h"
#include "common/goos/PrettyPrinter.h"

namespace decompiler {

/*void clean_up_ifs(Form* top_level_form, const Env&) {
  bool changed = true;
  while (changed) {
    for (auto x : top_level_form->elts()) {
      assert(x->parent_form == top_level_form);
    }
    changed = false;

    for (auto x : top_level_form->elts()) {
      assert(x->parent_form == top_level_form);
    }
    top_level_form->apply([&](FormElement* elt) {
      auto as_ge = dynamic_cast<GenericElement*>(elt);
      if (!as_ge) {
        return;
      }

      if (as_ge->op().kind() == GenericOperator::Kind::CONDITION_OPERATOR) {
        if (as_ge->op().condition_kind() == IR2_Condition::Kind::TRUTHY) {
          assert(as_ge->elts().size() == 1);
          auto top_condition = as_ge->elts().front();
          if (!top_condition->is_single_element() && elt->parent_form) {
            auto real_condition = top_condition->back();
            top_condition->pop_back();

            auto& parent_vector = elt->parent_form->elts();
            // find us in the parent vector
            auto me = std::find_if(parent_vector.begin(), parent_vector.end(),
                                   [&](FormElement* x) { return x == elt; });
            assert(me != parent_vector.end());

            // now insert the fake condition
            for (auto& x : top_condition->elts()) {
              x->parent_form = elt->parent_form;
            }
            parent_vector.insert(me, top_condition->elts().begin(), top_condition->elts().end());
            top_condition->elts() = {real_condition};
            changed = true;
          }
        }
      }
    });
  }
}*/

bool convert_to_expressions(Form* top_level_form,
                            FormPool& pool,
                            Function& f,
                            const DecompilerTypeSystem& dts) {
  assert(top_level_form);

  //  fmt::print("Before anything:\n{}\n",
  //  pretty_print::to_string(top_level_form->to_form(f.ir2.env)));
  try {
    FormStack stack(true);
    for (auto& entry : top_level_form->elts()) {
      //      fmt::print("push {} to stack\n", entry->to_form(f.ir2.env).print());
      entry->push_to_stack(f.ir2.env, pool, stack);
      //      fmt::print("Stack is now:\n{}\n", stack.print(f.ir2.env));
    }
    std::vector<FormElement*> new_entries;
    if (f.type.last_arg() != TypeSpec("none")) {
      auto return_var = f.ir2.atomic_ops->end_op().return_var();
      new_entries = rewrite_to_get_var(stack, pool, return_var, f.ir2.env);
      auto reg_return_type =
          f.ir2.env.get_types_after_op(f.ir2.atomic_ops->ops.size() - 1).get(return_var.reg());
      if (!dts.ts.typecheck(f.type.last_arg(), reg_return_type.typespec(), "", false, false)) {
        // we need to cast the final value.
        auto to_cast = new_entries.back();
        new_entries.pop_back();
        auto cast = pool.alloc_element<CastElement>(f.type.last_arg(),
                                                    pool.alloc_single_form(nullptr, to_cast));
        new_entries.push_back(cast);
      }
    } else {
      new_entries = stack.rewrite(pool, f.ir2.env);
    }
    assert(!new_entries.empty());
    top_level_form->clear();
    for (auto x : new_entries) {
      top_level_form->push_back(x);
    }

    for (auto x : top_level_form->elts()) {
      assert(x->parent_form == top_level_form);
    }
    // fix up stuff

  } catch (std::exception& e) {
    f.warnings.expression_build_warning("In {}: {}", f.guessed_name.to_string(), e.what());
    lg::warn("In {}: {}", f.guessed_name.to_string(), e.what());
    return false;
  }

  if (f.guessed_name.kind == FunctionName::FunctionKind::GLOBAL) {
    f.ir2.env.set_remap_for_function(f.type.arg_count() - 1);
  } else if (f.guessed_name.kind == FunctionName::FunctionKind::METHOD) {
    if (f.guessed_name.method_id == GOAL_NEW_METHOD) {
      f.ir2.env.set_remap_for_new_method(f.type.arg_count() - 1);
    } else {
      f.ir2.env.set_remap_for_method(f.type.arg_count() - 1);
    }
  }

  auto config_map = get_config().function_arg_names.find(f.guessed_name.to_string());
  if (config_map != get_config().function_arg_names.end()) {
    std::unordered_map<std::string, std::string> map2;
    auto var_map = get_config().function_var_names.find(f.guessed_name.to_string());
    if (var_map != get_config().function_var_names.end()) {
      map2 = var_map->second;
    }
    f.ir2.env.map_args_from_config(config_map->second, map2);
  } else {
    auto var_map = get_config().function_var_names.find(f.guessed_name.to_string());
    if (var_map != get_config().function_var_names.end()) {
      f.ir2.env.map_args_from_config({}, var_map->second);
    }
  }

  return true;
}
}  // namespace decompiler