[Mono-list] Embedded API: static constructor calling

[jonathan at mugginsoft.com]

On 1 Oct 2013, at 13:03, Robert Jordan <robertj at gmx.net> wrote:

> On 01.10.2013 11:37, jonathan at mugginsoft.com wrote:
>> Is it the case that calling a static field via the embedded API does not cause the static constructor to be run?
>> This seems to be the behaviour I am observing.
>> 
>> In the example below setting the static MetaDataXXX fields (before any other static access) does not cause the static constructor to be run and expected behaviour is lost.
>> If I call a static warmup method first, which does trigger the constructor, then all is well.
> 
> You're supposed to call mono_runtime_class_init () on the vtable
> of the class before calling mono_field_static_get/set.
> 
> Robert

There doesn't seem to be anything in the docs about this.
Is it just a kludge?

in metadata/object.c/mono_field_get_value_object we see

if (type->attrs & FIELD_ATTRIBUTE_STATIC) {
		is_static = TRUE;

		if (!is_literal) {
			vtable = mono_class_vtable_full (domain, field->parent, TRUE);
			if (!vtable->initialized)
				mono_runtime_class_init (vtable);
		}
	} else {
		g_assert (obj);
	}

However, kludge or not it does seem to work:

void DBMonoClassGetField(MonoClass *monoClass, const char *fieldName, void *valueObject) {
	MonoClassField *field = mono_class_get_field_from_name(monoClass, fieldName);
	MonoVTable *vtable = mono_class_vtable(mono_domain_get(), monoClass);
	mono_runtime_class_init(vtable);
    
	mono_field_static_get_value(vtable, field, valueObject);
}

void DBMonoClassSetField(MonoClass *monoClass, const char *fieldName, MonoObject *valueObject) {
	MonoClassField *field = mono_class_get_field_from_name(monoClass, fieldName);
	MonoVTable *vtable = mono_class_vtable(mono_domain_get(), monoClass);
	mono_runtime_class_init(vtable);
    
	mono_field_static_set_value(vtable, field, valueObject);
}

Jonathan