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Changes necessary for hot reload to work

pull/1200/head
David Snopek 2023-08-04 11:02:57 -05:00
parent c44c3d5ebf
commit df849651d9
7 changed files with 63 additions and 0 deletions
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2
gdextension/gdextension_interface.h
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@ -267,6 +267,7 @@ typedef void (*GDExtensionClassUnreference)(GDExtensionClassInstancePtr p_instan
typedef void (*GDExtensionClassCallVirtual)(GDExtensionClassInstancePtr p_instance, const GDExtensionConstTypePtr *p_args, GDExtensionTypePtr r_ret);
typedef GDExtensionObjectPtr (*GDExtensionClassCreateInstance)(void *p_class_userdata);
typedef void (*GDExtensionClassFreeInstance)(void *p_class_userdata, GDExtensionClassInstancePtr p_instance);
typedef GDExtensionClassInstancePtr (*GDExtensionClassRecreateInstance)(void *p_class_userdata, GDExtensionObjectPtr p_object);
typedef GDExtensionClassCallVirtual (*GDExtensionClassGetVirtual)(void *p_class_userdata, GDExtensionConstStringNamePtr p_name);
typedef void *(*GDExtensionClassGetVirtualCallData)(void *p_class_userdata, GDExtensionConstStringNamePtr p_name);
typedef void (*GDExtensionClassCallVirtualWithData)(GDExtensionClassInstancePtr p_instance, GDExtensionConstStringNamePtr p_name, void *p_virtual_call_userdata, const GDExtensionConstTypePtr *p_args, GDExtensionTypePtr r_ret);
@ -308,6 +309,7 @@ typedef struct {
GDExtensionClassUnreference unreference_func;
GDExtensionClassCreateInstance create_instance_func; // (Default) constructor; mandatory. If the class is not instantiable, consider making it virtual or abstract.
GDExtensionClassFreeInstance free_instance_func; // Destructor; mandatory.
GDExtensionClassRecreateInstance recreate_instance_func;
// Queries a virtual function by name and returns a callback to invoke the requested virtual function.
GDExtensionClassGetVirtual get_virtual_func;
// Paired with `call_virtual_with_data_func`, this is an alternative to `get_virtual_func` for extensions that

24
include/godot_cpp/classes/wrapped.hpp
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@ -51,6 +51,15 @@ class Wrapped {
friend void postinitialize_handler(Wrapped *);
protected:
#ifdef HOT_RELOAD_ENABLED
struct RecreateInstance {
GDExtensionClassInstancePtr wrapper;
GDExtensionObjectPtr owner;
RecreateInstance *next;
};
inline static RecreateInstance *recreate_instance = nullptr;
#endif
virtual const StringName *_get_extension_class_name() const; // This is needed to retrieve the class name before the godot object has its _extension and _extension_instance members assigned.
virtual const GDExtensionInstanceBindingCallbacks *_get_bindings_callbacks() const = 0;
@ -106,6 +115,17 @@ void free_c_property_list(GDExtensionPropertyInfo *plist);
} // namespace godot
#ifdef HOT_RELOAD_ENABLED
#define _GDCLASS_RECREATE(m_class, m_inherits) \
m_class *new_instance = (m_class *)memalloc(sizeof(m_class)); \
Wrapped::RecreateInstance recreate_data = { new_instance, obj, Wrapped::recreate_instance }; \
Wrapped::recreate_instance = &recreate_data; \
memnew_placement(new_instance, m_class); \
return new_instance;
#else
#define _GDCLASS_RECREATE(m_class, m_inherits) return nullptr;
#endif
// Use this on top of your own classes.
// Note: the trail of `***` is to keep sane diffs in PRs, because clang-format otherwise moves every `\` which makes
// every line of the macro different
@ -193,6 +213,10 @@ public:
return new_object->_owner; \
} \
\
static GDExtensionClassInstancePtr recreate(void *data, GDExtensionObjectPtr obj) { \
_GDCLASS_RECREATE(m_class, m_inherits); \
} \
\
static void notification_bind(GDExtensionClassInstancePtr p_instance, int32_t p_what, GDExtensionBool p_reversed) { \
if (p_instance && m_class::_get_notification()) { \
if (m_class::_get_notification() != m_inherits::_get_notification()) { \

1
include/godot_cpp/core/class_db.hpp
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@ -201,6 +201,7 @@ void ClassDB::_register_class(bool p_virtual, bool p_exposed) {
nullptr, // GDExtensionClassUnreference unreference_func;
T::create, // GDExtensionClassCreateInstance create_instance_func; /* this one is mandatory */
T::free, // GDExtensionClassFreeInstance free_instance_func; /* this one is mandatory */
T::recreate, // GDExtensionClassRecreateInstance recreate_instance_func;
&ClassDB::get_virtual_func, // GDExtensionClassGetVirtual get_virtual_func;
nullptr, // GDExtensionClassGetVirtualCallData get_virtual_call_data_func;
nullptr, // GDExtensionClassCallVirtualWithData call_virtual_func;

19
src/classes/wrapped.cpp
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@ -49,6 +49,25 @@ void Wrapped::_postinitialize() {
}
Wrapped::Wrapped(const StringName p_godot_class) {
#ifdef HOT_RELOAD_ENABLED
if (unlikely(Wrapped::recreate_instance)) {
RecreateInstance *recreate_data = Wrapped::recreate_instance;
RecreateInstance *previous = nullptr;
while (recreate_data) {
if (recreate_data->wrapper == this) {
_owner = recreate_data->owner;
if (previous) {
previous->next = recreate_data->next;
} else {
Wrapped::recreate_instance = recreate_data->next;
}
return;
}
previous = recreate_data;
recreate_data = recreate_data->next;
}
}
#endif
_owner = godot::internal::gdextension_interface_classdb_construct_object(reinterpret_cast<GDExtensionConstStringNamePtr>(p_godot_class._native_ptr()));
}

3
src/core/class_db.cpp
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@ -365,6 +365,9 @@ void ClassDB::deinitialize(GDExtensionInitializationLevel p_level) {
for (auto method : cl.method_map) {
memdelete(method.second);
}
classes.erase(*i);
class_register_order.erase((i + 1).base());
}
}

11
tools/godotcpp.py
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@ -175,6 +175,14 @@ def options(opts, env):
)
)
opts.Add(
BoolVariable(
key="use_hot_reload",
help="Enable the extra accounting required to support hot reload.",
default=(env.get("target", "template_debug") != "template_release"),
)
)
# Add platform options
for pl in platforms:
tool = Tool(pl, toolpath=["tools"])
@ -231,6 +239,9 @@ def generate(env):
print("Building for architecture " + env["arch"] + " on platform " + env["platform"])
if env["use_hot_reload"]:
env.Append(CPPDEFINES=["HOT_RELOAD_ENABLED"])
tool = Tool(env["platform"], toolpath=["tools"])
if tool is None or not tool.exists(env):

3
tools/linux.py
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@ -14,6 +14,9 @@ def generate(env):
if env["use_llvm"]:
clang.generate(env)
clangxx.generate(env)
elif env["use_hot_reload"]:
# Required for extensions to truly unload.
env.Append(CXXFLAGS=["-fno-gnu-unique"])
env.Append(CCFLAGS=["-fPIC", "-Wwrite-strings"])
env.Append(LINKFLAGS=["-Wl,-R,'$$ORIGIN'"])