godot/editor/plugins/gdextension_export_plugin.h

/*************************************************************************/
/*  gdextension_export_plugin.h                                          */
/*************************************************************************/
/*                       This file is part of:                           */
/*                           GODOT ENGINE                                */
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/* Copyright (c) 2007-2022 Juan Linietsky, Ariel Manzur.                 */
/* Copyright (c) 2014-2022 Godot Engine contributors (cf. AUTHORS.md).   */
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#ifndef GDEXTENSION_EXPORT_PLUGIN_H
#define GDEXTENSION_EXPORT_PLUGIN_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 != "NativeExtension") {
		return;
	}

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

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

	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");

	List<String> libraries;

	config->get_section_keys("libraries", &libraries);

	bool could_export = false;
	for (const String &E : libraries) {
		Vector<String> tags = E.split(".");
		bool all_tags_met = true;
		for (int i = 0; i < tags.size(); i++) {
			String tag = tags[i].strip_edges();
			if (!p_features.has(tag)) {
				all_tags_met = false;
				break;
			}
		}

		if (all_tags_met) {
			String library_path = config->get_value("libraries", E);
			if (!library_path.begins_with("res://")) {
				print_line("Skipping export of out-of-project library " + library_path);
				continue;
			}
			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);
			}
			could_export = true;
			break;
		}
	}
	if (!could_export) {
		Vector<String> tags;
		for (const String &E : p_features) {
			tags.append(E);
		}
		ERR_FAIL_MSG(vformat("No suitable library found. The libraries' tags referred to an invalid feature flag. Possible feature flags for your platform: %s", p_path, String(", ").join(tags)));
	}

	List<String> dependencies;
	if (config->has_section("dependencies")) {
		config->get_section_keys("dependencies", &dependencies);
	}

	for (const String &E : libraries) {
		Vector<String> tags = E.split(".");
		bool all_tags_met = true;
		for (int i = 0; i < tags.size(); i++) {
			String tag = tags[i].strip_edges();
			if (!p_features.has(tag)) {
				all_tags_met = false;
				break;
			}
		}

		if (all_tags_met) {
			Dictionary dependency = config->get_value("dependencies", E);
			for (const Variant *key = dependency.next(nullptr); key; key = dependency.next(key)) {
				String library_path = *key;
				String target_path = dependency[*key];
				if (!library_path.begins_with("res://")) {
					print_line("Skipping export of out-of-project library " + library_path);
					continue;
				}
				add_shared_object(library_path, tags, target_path);
			}
			break;
		}
	}
}

#endif // GDEXTENSION_EXPORT_PLUGIN_H