6 files changed, 153 insertions, 0 deletions
diff --git a/source/20-codegen-runtime/MacrosCodegen.hpp b/source/20-codegen-runtime/MacrosCodegen.hpp
new file mode 100644
index 0000000..43ae99c
--- /dev/null
+++ b/source/20-codegen-runtime/MacrosCodegen.hpp
@@ -0,0 +1,10 @@
+// NOTE: Contents of this file is coupled with the codegen compiler.
+//       When updating, change both sides at the same time.
+
+#pragma once
+
+#define BRUSSEL_CLASS(...)
+#define BRUSSEL_PROPERTY(...)
+#define BRUSSEL_METHOD(...)
+
+#define BRUSSEL_ENUM(...)
diff --git a/source/20-codegen-runtime/Metadata.cpp b/source/20-codegen-runtime/Metadata.cpp
new file mode 100644
index 0000000..0d640da
--- /dev/null
+++ b/source/20-codegen-runtime/Metadata.cpp
@@ -0,0 +1,45 @@
+#include "Metadata.hpp"
+
+auto Metadata::TypeInfoList::Iterator::operator*() const -> const TypeInfo& {
+    // TODO
+}
+
+auto Metadata::TypeInfoList::Iterator::operator++() -> Iterator& {
+    // TODO
+}
+
+auto Metadata::TypeInfoList::Iterator::operator++(int) -> Iterator {
+	auto copy = *this;
+	++copy;
+	return copy;
+}
+
+bool Metadata::TypeInfoList::Iterator::operator==(const Iterator& that) const {
+	return this->data == that.data;
+}
+
+bool Metadata::TypeInfoList::Iterator::operator==(const Sentinel&) const {
+    // TODO
+}
+
+auto Metadata::TypeInfoList::begin() const -> Iterator {
+	return Iterator();
+}
+
+auto Metadata::TypeInfoList::end() const -> Sentinel {
+	return Sentinel();
+}
+
+auto Metadata::GetTypeInfoList() -> const TypeInfoList& {
+	// TODO
+}
+
+auto Metadata::QueryTypeInfo(TypeId id) -> const TypeInfo* {
+	// TODO
+	return nullptr;
+}
+
+auto Metadata::QueryTypeInfo(std::string_view id) -> const TypeInfo* {
+	// TODO
+	return nullptr;
+}
diff --git a/source/20-codegen-runtime/Metadata.hpp b/source/20-codegen-runtime/Metadata.hpp
new file mode 100644
index 0000000..e89fd8f
--- /dev/null
+++ b/source/20-codegen-runtime/Metadata.hpp
@@ -0,0 +1,33 @@
+#pragma once
+
+#include "MacrosCodegen.hpp"
+#include "MetadataBase.hpp"
+
+namespace Metadata {
+
+struct TypeInfoList {
+	struct Sentinel {
+	};
+
+	struct Iterator {
+		void* data;
+
+		const TypeInfo& operator*() const;
+		Iterator& operator++();
+		Iterator operator++(int);
+
+		bool operator==(const Iterator&) const;
+		bool operator==(const Sentinel&) const;
+	};
+
+	Iterator begin() const;
+	Sentinel end() const;
+};
+
+/// Get a list of all type infos present.
+const TypeInfoList& GetTypeInfoList();
+
+const TypeInfo* QueryTypeInfo(TypeId id);
+const TypeInfo* QueryTypeInfo(std::string_view name);
+
+} // namespace Metadata
diff --git a/source/20-codegen-runtime/MetadataBase.cpp b/source/20-codegen-runtime/MetadataBase.cpp
new file mode 100644
index 0000000..2f2ef94
--- /dev/null
+++ b/source/20-codegen-runtime/MetadataBase.cpp
@@ -0,0 +1,5 @@
+#include "MetadataBase.hpp"
+
+bool Metadata::TypePropertyInfo::IsDirectAccess() const {
+	return getterName.empty() && setterName.empty();
+}
diff --git a/source/20-codegen-runtime/MetadataBase.hpp b/source/20-codegen-runtime/MetadataBase.hpp
new file mode 100644
index 0000000..c1ad894
--- /dev/null
+++ b/source/20-codegen-runtime/MetadataBase.hpp
@@ -0,0 +1,53 @@
+#pragma once
+
+#include <cstddef>
+#include <optional>
+#include <span>
+#include <string_view>
+
+namespace Metadata {
+
+struct TypeId {
+	size_t id;
+};
+
+struct TypeInfo;
+
+struct TypePropertyInfo {
+	std::string_view name;
+	const TypeInfo* type;
+	std::string_view getterName;
+	std::string_view setterName;
+
+	bool IsDirectAccess() const;
+};
+
+struct TypeMethodInfo {
+	std::string_view name;
+	// TODO
+};
+
+struct TypeInfo {
+	TypeId typeId;
+	std::string_view name;
+	std::span<const TypeInfo*> parents;
+	std::span<const TypePropertyInfo> properties;
+	std::span<const TypeMethodInfo> methods;
+
+	/// Whether this object is registered at runtime or statically compiled
+	bool dynamic = false;
+};
+
+// NOTE: implemented by generating specializations; not-generated ones should generated an error in the linking phase
+template <typename T>
+const TypeInfo* GetTypeInfo();
+
+// NOTE: implemented by generating specializations; not-generated ones should generated an error in the linking phase
+template <typename TEnum>
+std::string_view EnumToString(TEnum value);
+
+// NOTE: implemented by generating specializations; not-generated ones should generated an error in the linking phase
+template <typename TEnum>
+std::optional<TEnum> EnumFromString(std::string_view str);
+
+} // namespace Metadata
diff --git a/source/20-codegen-runtime/MetadataDetails.hpp b/source/20-codegen-runtime/MetadataDetails.hpp
new file mode 100644
index 0000000..09b71ff
--- /dev/null
+++ b/source/20-codegen-runtime/MetadataDetails.hpp
@@ -0,0 +1,7 @@
+// This file contains implementation details used by the outputs of the code generaetor. Consumers do not use.
+#pragma once
+
+#include "MetadataBase.hpp"
+
+namespace Metadata::Details {
+} // namespace Metadata::Details