godot/editor/plugins/gdextension_export_plugin.h

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/*  gdextension_export_plugin.h                                           */
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/* Copyright (c) 2007-2014 Juan Linietsky, Ariel Manzur.                  */
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#ifndef GDEXTENSION_EXPORT_PLUGIN_H
#define GDEXTENSION_EXPORT_PLUGIN_H

#include "core/extension/gdextension_library_loader.h"
#include "editor/export/editor_export.h"

class GDExtensionExportPlugin : public EditorExportPlugin {
protected:
	virtual void _export_file(const String &p_path, const String &p_type, const HashSet<String> &p_features);
	virtual String get_name() const { return "GDExtension"; }
};

void GDExtensionExportPlugin::_export_file(const String &p_path, const String &p_type, const HashSet<String> &p_features) {
	if (p_type != "GDExtension") {
		return;
	}

	Ref<ConfigFile> config;
	config.instantiate();

	Error err = config->load(p_path);
	ERR_FAIL_COND_MSG(err, "Failed to load GDExtension file: " + p_path);

	// Check whether this GDExtension should be exported.
	bool android_aar_plugin = config->get_value("configuration", "android_aar_plugin", false);
	if (android_aar_plugin && p_features.has("android")) {
		// The gdextension configuration and Android .so files will be provided by the Android aar
		// plugin it's part of, so we abort here.
		skip();
		return;
	}

	ERR_FAIL_COND_MSG(!config->has_section_key("configuration", "entry_symbol"), "Failed to export GDExtension file, missing entry symbol: " + p_path);

	String entry_symbol = config->get_value("configuration", "entry_symbol");

	HashSet<String> all_archs;
	all_archs.insert("x86_32");
	all_archs.insert("x86_64");
	all_archs.insert("arm32");
	all_archs.insert("arm64");
	all_archs.insert("rv64");
	all_archs.insert("ppc32");
	all_archs.insert("ppc64");
	all_archs.insert("wasm32");
	all_archs.insert("universal");

	HashSet<String> archs;
	HashSet<String> features_wo_arch;
	for (const String &tag : p_features) {
		if (all_archs.has(tag)) {
			archs.insert(tag);
		} else {
			features_wo_arch.insert(tag);
		}
	}

	if (archs.is_empty()) {
		archs.insert("unknown_arch"); // Not archs specified, still try to match.
	}

	HashSet<String> libs_added;

	for (const String &arch_tag : archs) {
		PackedStringArray tags;
		String library_path = GDExtensionLibraryLoader::find_extension_library(
				p_path, config, [features_wo_arch, arch_tag](const String &p_feature) { return features_wo_arch.has(p_feature) || (p_feature == arch_tag); }, &tags);
		if (libs_added.has(library_path)) {
			continue; // Universal library, already added for another arch, do not duplicate.
		}
		if (!library_path.is_empty()) {
			libs_added.insert(library_path);
			add_shared_object(library_path, tags);

			if (p_features.has("ios") && (library_path.ends_with(".a") || library_path.ends_with(".xcframework"))) {
				String additional_code = "extern void register_dynamic_symbol(char *name, void *address);\n"
										 "extern void add_ios_init_callback(void (*cb)());\n"
										 "\n"
										 "extern \"C\" void $ENTRY();\n"
										 "void $ENTRY_init() {\n"
										 "  if (&$ENTRY) register_dynamic_symbol((char *)\"$ENTRY\", (void *)$ENTRY);\n"
										 "}\n"
										 "struct $ENTRY_struct {\n"
										 "  $ENTRY_struct() {\n"
										 "    add_ios_init_callback($ENTRY_init);\n"
										 "  }\n"
										 "};\n"
										 "$ENTRY_struct $ENTRY_struct_instance;\n\n";
				additional_code = additional_code.replace("$ENTRY", entry_symbol);
				add_ios_cpp_code(additional_code);

				String linker_flags = "-Wl,-U,_" + entry_symbol;
				add_ios_linker_flags(linker_flags);
			}
		} else {
			Vector<String> features_vector;
			for (const String &E : p_features) {
				features_vector.append(E);
			}
			ERR_FAIL_MSG(vformat("No suitable library found for GDExtension: %s. Possible feature flags for your platform: %s", p_path, String(", ").join(features_vector)));
		}

		Vector<SharedObject> dependencies_shared_objects = GDExtensionLibraryLoader::find_extension_dependencies(p_path, config, [p_features](String p_feature) { return p_features.has(p_feature); });
		for (const SharedObject &shared_object : dependencies_shared_objects) {
			_add_shared_object(shared_object);
		}
	}
}

#endif // GDEXTENSION_EXPORT_PLUGIN_H