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Don't cache null forever if a singleton isn't available yet #1181

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merged 1 commit into from
Jul 27, 2023
Merged

Don't cache null forever if a singleton isn't available yet #1181

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13 changes: 10 additions & 3 deletions binding_generator.py
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Original file line number Diff line number Diff line change
Expand Up @@ -1453,15 +1453,22 @@ def generate_engine_class_source(class_api, used_classes, fully_used_classes, us

if is_singleton:
result.append(f"{class_name} *{class_name}::get_singleton() {{")
# We assume multi-threaded access is OK because each assignment will assign the same value every time
result.append(f"\tstatic {class_name} *singleton = nullptr;")
result.append("\tif (unlikely(singleton == nullptr)) {")
result.append(
f"\tstatic GDExtensionObjectPtr singleton_obj = internal::gdextension_interface_global_get_singleton({class_name}::get_class_static()._native_ptr());"
f"\t\tGDExtensionObjectPtr singleton_obj = internal::gdextension_interface_global_get_singleton({class_name}::get_class_static()._native_ptr());"
)
result.append("#ifdef DEBUG_ENABLED")
result.append("\tERR_FAIL_COND_V(singleton_obj == nullptr, nullptr);")
result.append("\t\tERR_FAIL_COND_V(singleton_obj == nullptr, nullptr);")
result.append("#endif // DEBUG_ENABLED")
result.append(
f"\tstatic {class_name} *singleton = reinterpret_cast<{class_name} *>(internal::gdextension_interface_object_get_instance_binding(singleton_obj, internal::token, &{class_name}::_gde_binding_callbacks));"
f"\t\tsingleton = reinterpret_cast<{class_name} *>(internal::gdextension_interface_object_get_instance_binding(singleton_obj, internal::token, &{class_name}::_gde_binding_callbacks));"
)
result.append("#ifdef DEBUG_ENABLED")
result.append("\t\tERR_FAIL_COND_V(singleton == nullptr, nullptr);")
result.append("#endif // DEBUG_ENABLED")
result.append("\t}")
result.append("\treturn singleton;")
result.append("}")
result.append("")
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