object-introspection/types/multi_set_type.toml

[info]
type_name = "std::multiset"
stub_template_params = [1,2]
ctype = "MULTI_SET_TYPE"
header = "set"

# Old:
typeName = "std::multiset<"
ns = ["namespace std"]
numTemplateParams = 1
replaceTemplateParamIndex = [1]
allocatorIndex = 2

[codegen]
decl = """
template<typename Key, typename Compare, typename Alloc>
void getSizeType(const %1%<Key, Compare, Alloc> &container, size_t& returnArg);
"""

func = """
template<typename Key, typename Compare, typename Alloc>
void getSizeType(const %1%<Key, Compare, Alloc> &container, size_t& returnArg)
{
    constexpr size_t nodeSize = sizeof(typename %1%<Key, Compare, Alloc>::node_type);
    size_t numElems = container.size();

    SAVE_SIZE(sizeof(%1%<Key, Compare, Alloc>) + (nodeSize * numElems));

    SAVE_DATA((uintptr_t)numElems);

    // The double ampersand is needed otherwise this loop doesn't work with vector<bool>
    for (auto&& it: container) {
    getSizeType(it, returnArg);
    }
}
"""

handler = """
template <typename DB, typename T0, typename T1, typename T2>
struct TypeHandler<DB, %1% <T0, T1, T2>> {
  using type = types::st::List<DB, typename TypeHandler<DB, T0>::type>;

  static types::st::Unit<DB> getSizeType(
      const %1%<T0, T1, T2>& container,
      typename TypeHandler<DB, %1%<T0, T1, T2>>::type returnArg) {
    constexpr size_t nodeSize = sizeof(typename %1%<T0, T1, T2>::node_type);

    auto tail = returnArg.write(container.size());

    // The double ampersand is needed otherwise this loop doesn't work with
    // vector<bool>
    for (auto&& it : container) {
      tail = tail.delegate([&it](auto ret) {
        return OIInternal::getSizeType<DB>(it, ret);
      });
    }

    return tail.finish();
  }
};
"""

traversal_func = """
auto tail = returnArg.write((uintptr_t)&container)
                .write(container.size());

// The double ampersand is needed otherwise this loop doesn't work with
// vector<bool>
for (auto&& it : container) {
  tail = tail.delegate([&it](auto ret) {
    return OIInternal::getSizeType<DB>(it, ret);
  });
}

return tail.finish();
"""

[[codegen.processor]]
type = "types::st::VarInt<DB>"
func = """
el.pointer = std::get<ParsedData::VarInt>(d.val).value;
"""

[[codegen.processor]]
type = "types::st::List<DB, typename TypeHandler<DB, T0>::type>"
func = """
#ifdef __GLIBCXX__
/* We don't have access to the _Rb_tree_node struct, so we manually re-create it
 * to get the effective size of a multiset entry. Is there a better way to do this?
 *
 * https://gcc.gnu.org/onlinedocs/libstdc++/latest-doxygen/a00716_source.html#l00216
 * From the source of <bits/stl_tree.h>, an _Rb_tree_node has the following members:
 */
struct OI_Rb_tree_node {
  using _Rb_tree_color = int;       // enum
  using _Base_ptr = std::nullptr_t; // pointer

  _Rb_tree_color      _M_color;  // from parent _Rb_tree_node_base
  _Base_ptr           _M_parent; // from parent _Rb_tree_node_base
  _Base_ptr           _M_left;   // from parent _Rb_tree_node_base
  _Base_ptr           _M_right;  // from parent _Rb_tree_node_base
  T0                  _M_value;
};

static constexpr size_t element_size = sizeof(OI_Rb_tree_node);
#elif _LIBCPP_VERSION
static_assert(false && "libc++ is currently not supported");

/* We don't have access to the __tree_node struct, so we manually re-create it
 * to get the effective size of a multiset entry. Is there a better way to do this?
 *
 * https://github.com/llvm/llvm-project/blob/1b10920164695a487669405223f8bbe93799430c/libcxx/include/__tree#L729-L781
 * From the source of <__tree>, a __tree_node has the following members:
 */
struct OI__tree_node {
  using pointer = std::nullptr_t;          // pointer
  using __parent_pointer = std::nullptr_t; // pointer

  pointer           __left_;     // from parent __tree_end_node
  pointer           __right_;    // from parent __tree_node_base
  __parent_pointer  __parent_;   // from parent __tree_node_base
  bool              __is_black_; // from parent __tree_node_base
  T0                __value_;
};

static constexpr size_t element_size = sizeof(OI__tree_node);
#else
static_assert(false && "No known element_size for multisets. See types/multi_set_type.toml");
#endif

static constexpr auto childField = inst::Field{
  sizeof(T0),
  "[]",
  NameProvider<T0>::names,
  TypeHandler<DB, T0>::fields,
  TypeHandler<DB, T0>::processors,
};

auto list = std::get<ParsedData::List>(d.val);
el.container_stats.emplace(result::Element::ContainerStats {
  .capacity = list.length,
  .length = list.length,
});
el.exclusive_size += el.container_stats->length * (element_size - sizeof(T0));

for (size_t i = 0; i < list.length; i++)
  ins.emplace(childField);
"""