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pub(super) use super::super::ALLOCATOR_MAPPING;
use super::GenCopy;
use crate::plan::barriers::ObjectBarrier;
use crate::plan::generational::barrier::GenObjectBarrierSemantics;
use crate::plan::generational::create_gen_space_mapping;
use crate::plan::mutator_context::unreachable_prepare_func;
use crate::plan::mutator_context::Mutator;
use crate::plan::mutator_context::MutatorConfig;
use crate::plan::AllocationSemantics;
use crate::util::alloc::allocators::Allocators;
use crate::util::alloc::BumpAllocator;
use crate::util::{VMMutatorThread, VMWorkerThread};
use crate::vm::VMBinding;
use crate::MMTK;

pub fn gencopy_mutator_release<VM: VMBinding>(mutator: &mut Mutator<VM>, _tls: VMWorkerThread) {
    // reset nursery allocator
    let bump_allocator = unsafe {
        mutator
            .allocators
            .get_allocator_mut(mutator.config.allocator_mapping[AllocationSemantics::Default])
    }
    .downcast_mut::<BumpAllocator<VM>>()
    .unwrap();
    bump_allocator.reset();
}

pub fn create_gencopy_mutator<VM: VMBinding>(
    mutator_tls: VMMutatorThread,
    mmtk: &'static MMTK<VM>,
) -> Mutator<VM> {
    let gencopy = mmtk.get_plan().downcast_ref::<GenCopy<VM>>().unwrap();
    let config = MutatorConfig {
        allocator_mapping: &ALLOCATOR_MAPPING,
        space_mapping: Box::new(create_gen_space_mapping(
            mmtk.get_plan(),
            &gencopy.gen.nursery,
        )),
        prepare_func: &unreachable_prepare_func,
        release_func: &gencopy_mutator_release,
    };

    Mutator {
        allocators: Allocators::<VM>::new(mutator_tls, mmtk, &config.space_mapping),
        barrier: Box::new(ObjectBarrier::new(GenObjectBarrierSemantics::new(
            mmtk, gencopy,
        ))),
        mutator_tls,
        config,
        plan: gencopy,
    }
}