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/* -*- mode: C++; c-basic-offset: 4; indent-tabs-mode: nil; -*- */
// SPDX-License-Identifier: MIT OR LGPL-2.0-or-later
// SPDX-FileCopyrightText: 2008 litl, LLC
// SPDX-FileCopyrightText: 2021 Canonical Ltd.
// SPDX-FileContributor: Marco Trevisan <marco.trevisan@canonical.com>
#ifndef GI_CLOSURE_H_
#define GI_CLOSURE_H_
#include <config.h>
#include <stddef.h>
#include <glib-object.h>
#include <js/TypeDecls.h>
#include "gi/utils-inl.h"
#include "cjs/jsapi-util-root.h"
#include "cjs/jsapi-util.h"
#include "cjs/macros.h"
class JSTracer;
namespace JS {
class HandleValueArray;
}
namespace Gjs {
class Closure : public GClosure {
protected:
Closure(JSContext*, JSObject* callable, bool root, const char* description);
~Closure() { unset_context(); }
// Need to call this if inheriting from Closure to call the dtor
template <class C>
constexpr void add_finalize_notifier() {
static_assert(std::is_base_of_v<Closure, C>);
g_closure_add_finalize_notifier(
this, nullptr,
[](void*, GClosure* closure) { static_cast<C*>(closure)->~C(); });
}
void* operator new(size_t size) {
return g_closure_new_simple(size, nullptr);
}
void operator delete(void* p) { unref(static_cast<Closure*>(p)); }
static Closure* ref(Closure* self) {
return static_cast<Closure*>(g_closure_ref(self));
}
static void unref(Closure* self) { g_closure_unref(self); }
public:
using Ptr = GjsAutoPointer<Closure, Closure, unref, ref>;
[[nodiscard]] constexpr static Closure* for_gclosure(GClosure* gclosure) {
// We need to do this in order to ensure this is a constant expression
return static_cast<Closure*>(static_cast<void*>(gclosure));
}
[[nodiscard]] static Closure* create(JSContext* cx, JSObject* callable,
const char* description, bool root) {
auto* self = new Closure(cx, callable, root, description);
self->add_finalize_notifier<Closure>();
return self;
}
[[nodiscard]] static Closure* create_marshaled(JSContext* cx,
JSObject* callable,
const char* description,
bool root = true) {
auto* self = new Closure(cx, callable, root, description);
self->add_finalize_notifier<Closure>();
g_closure_set_marshal(self, marshal_cb);
return self;
}
[[nodiscard]] static Closure* create_for_signal(JSContext* cx,
JSObject* callable,
const char* description,
int signal_id) {
auto* self = new Closure(cx, callable, false /* root */, description);
self->add_finalize_notifier<Closure>();
g_closure_set_meta_marshal(self, gjs_int_to_pointer(signal_id),
marshal_cb);
return self;
}
// COMPAT: constexpr in C++23
JSObject* callable() const { return m_callable.get(); }
[[nodiscard]] constexpr JSContext* context() const { return m_cx; }
[[nodiscard]] constexpr bool is_valid() const { return !!m_cx; }
GJS_JSAPI_RETURN_CONVENTION bool invoke(JS::HandleObject,
const JS::HandleValueArray&,
JS::MutableHandleValue);
void trace(JSTracer* tracer) {
if (m_callable)
m_callable.trace(tracer, "signal connection");
}
private:
void unset_context();
void reset() {
unset_context();
m_callable.reset();
m_cx = nullptr;
}
static void marshal_cb(GClosure* closure, GValue* ret, unsigned n_params,
const GValue* params, void* hint, void* data) {
for_gclosure(closure)->marshal(ret, n_params, params, hint, data);
}
static void global_context_notifier_cb(JSContext*, void* data) {
static_cast<Closure*>(data)->global_context_finalized();
}
void closure_invalidated();
void closure_set_invalid();
void global_context_finalized();
void marshal(GValue* ret, unsigned n_parms, const GValue* params,
void* hint, void* data);
// The saved context is used for lifetime management, so that the closure
// will be torn down with the context that created it.
// The context could be attached to the default context of the runtime
// using if we wanted the closure to survive the context that created it.
JSContext* m_cx;
GjsMaybeOwned m_callable;
};
} // namespace Gjs
#endif // GI_CLOSURE_H_
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