Move methods in multiple VM traits into VMBinding.

macros/src/plan_trace_object_impl.rs

@@ -86,7 +86,7 @@ pub(crate) fn generate_trace_object<'a>(
         }
     } else {
         quote! {
-            <VM::VMActivePlan as crate::vm::ActivePlan<VM>>::vm_trace_object::<Q>(__mmtk_queue, __mmtk_objref, __mmtk_worker)
+            VM::vm_trace_object::<Q>(__mmtk_queue, __mmtk_objref, __mmtk_worker)
         }
     };
 

src/memory_manager.rs

@@ -23,7 +23,6 @@ use crate::util::heap::layout::vm_layout::vm_layout;
 use crate::util::opaque_pointer::*;
 use crate::util::{Address, ObjectReference};
 use crate::vm::edge_shape::MemorySlice;
-use crate::vm::ReferenceGlue;
 use crate::vm::VMBinding;
 use std::sync::atomic::Ordering;
 /// Initialize an MMTk instance. A VM should call this method after creating an [`crate::MMTK`]
@@ -446,16 +445,15 @@ pub fn get_malloc_bytes<VM: VMBinding>(mmtk: &MMTK<VM>) -> usize {
 /// However, if a binding uses counted malloc (which won't poll for GC), they may want to poll for GC manually.
 /// This function should only be used by mutator threads.
 pub fn gc_poll<VM: VMBinding>(mmtk: &MMTK<VM>, tls: VMMutatorThread) {
-    use crate::vm::{ActivePlan, Collection};
     debug_assert!(
-        VM::VMActivePlan::is_mutator(tls.0),
+        VM::is_mutator(tls.0),
         "gc_poll() can only be called by a mutator thread."
     );
 
     if mmtk.state.should_trigger_gc_when_heap_is_full() && mmtk.gc_trigger.poll(false, None) {
         debug!("Collection required");
         assert!(mmtk.state.is_initialized(), "GC is not allowed here: collection is not initialized (did you call initialize_collection()?).");
-        VM::VMCollection::block_for_gc(tls);
+        VM::block_for_gc(tls);
     }
 }
 
@@ -785,10 +783,7 @@ pub fn harness_end<VM: VMBinding>(mmtk: &'static MMTK<VM>) {
 /// Arguments:
 /// * `mmtk`: A reference to an MMTk instance
 /// * `object`: The object that has a finalizer
-pub fn add_finalizer<VM: VMBinding>(
-    mmtk: &'static MMTK<VM>,
-    object: <VM::VMReferenceGlue as ReferenceGlue<VM>>::FinalizableType,
-) {
+pub fn add_finalizer<VM: VMBinding>(mmtk: &'static MMTK<VM>, object: VM::FinalizableType) {
     if *mmtk.options.no_finalizer {
         warn!("add_finalizer() is called when no_finalizer = true");
     }
@@ -845,9 +840,7 @@ pub fn is_pinned<VM: VMBinding>(object: ObjectReference) -> bool {
 ///
 /// Arguments:
 /// * `mmtk`: A reference to an MMTk instance.
-pub fn get_finalized_object<VM: VMBinding>(
-    mmtk: &'static MMTK<VM>,
-) -> Option<<VM::VMReferenceGlue as ReferenceGlue<VM>>::FinalizableType> {
+pub fn get_finalized_object<VM: VMBinding>(mmtk: &'static MMTK<VM>) -> Option<VM::FinalizableType> {
     if *mmtk.options.no_finalizer {
         warn!("get_finalized_object() is called when no_finalizer = true");
     }
@@ -865,9 +858,7 @@ pub fn get_finalized_object<VM: VMBinding>(
 ///
 /// Arguments:
 /// * `mmtk`: A reference to an MMTk instance.
-pub fn get_all_finalizers<VM: VMBinding>(
-    mmtk: &'static MMTK<VM>,
-) -> Vec<<VM::VMReferenceGlue as ReferenceGlue<VM>>::FinalizableType> {
+pub fn get_all_finalizers<VM: VMBinding>(mmtk: &'static MMTK<VM>) -> Vec<VM::FinalizableType> {
     if *mmtk.options.no_finalizer {
         warn!("get_all_finalizers() is called when no_finalizer = true");
     }
@@ -887,7 +878,7 @@ pub fn get_all_finalizers<VM: VMBinding>(
 pub fn get_finalizers_for<VM: VMBinding>(
     mmtk: &'static MMTK<VM>,
     object: ObjectReference,
-) -> Vec<<VM::VMReferenceGlue as ReferenceGlue<VM>>::FinalizableType> {
+) -> Vec<VM::FinalizableType> {
     if *mmtk.options.no_finalizer {
         warn!("get_finalizers() is called when no_finalizer = true");
     }

src/mmtk.rs

@@ -21,7 +21,6 @@ use crate::util::reference_processor::ReferenceProcessors;
 #[cfg(feature = "sanity")]
 use crate::util::sanity::sanity_checker::SanityChecker;
 use crate::util::statistics::stats::Stats;
-use crate::vm::ReferenceGlue;
 use crate::vm::VMBinding;
 use std::cell::UnsafeCell;
 use std::default::Default;
@@ -109,8 +108,7 @@ pub struct MMTK<VM: VMBinding> {
     pub(crate) state: Arc<GlobalState>,
     pub(crate) plan: UnsafeCell<Box<dyn Plan<VM = VM>>>,
     pub(crate) reference_processors: ReferenceProcessors,
-    pub(crate) finalizable_processor:
-        Mutex<FinalizableProcessor<<VM::VMReferenceGlue as ReferenceGlue<VM>>::FinalizableType>>,
+    pub(crate) finalizable_processor: Mutex<FinalizableProcessor<VM::FinalizableType>>,
     pub(crate) scheduler: Arc<GCWorkScheduler<VM>>,
     #[cfg(feature = "sanity")]
     pub(crate) sanity_checker: Mutex<SanityChecker<VM::VMEdge>>,
@@ -201,9 +199,7 @@ impl<VM: VMBinding> MMTK<VM> {
             state,
             plan: UnsafeCell::new(plan),
             reference_processors: ReferenceProcessors::new(),
-            finalizable_processor: Mutex::new(FinalizableProcessor::<
-                <VM::VMReferenceGlue as ReferenceGlue<VM>>::FinalizableType,
-            >::new()),
+            finalizable_processor: Mutex::new(FinalizableProcessor::<VM::FinalizableType>::new()),
             scheduler,
             #[cfg(feature = "sanity")]
             sanity_checker: Mutex::new(SanityChecker::new()),
@@ -312,7 +308,6 @@ impl<VM: VMBinding> MMTK<VM> {
         force: bool,
         exhaustive: bool,
     ) {
-        use crate::vm::Collection;
         if !self.get_plan().constraints().collects_garbage {
             warn!("User attempted a collection request, but the plan can not do GC. The request is ignored.");
             return;
@@ -330,7 +325,7 @@ impl<VM: VMBinding> MMTK<VM> {
                 .user_triggered_collection
                 .store(true, Ordering::Relaxed);
             self.gc_requester.request();
-            VM::VMCollection::block_for_gc(tls);
+            VM::block_for_gc(tls);
         }
     }
 

src/plan/barriers.rs

@@ -1,7 +1,6 @@
 //! Read/Write barrier implementations.
 
 use crate::vm::edge_shape::{Edge, MemorySlice};
-use crate::vm::ObjectModel;
 use crate::{
     util::{metadata::MetadataSpec, *},
     vm::VMBinding,
@@ -134,8 +133,7 @@ impl<VM: VMBinding> Barrier<VM> for NoBarrier {}
 pub trait BarrierSemantics: 'static + Send {
     type VM: VMBinding;
 
-    const UNLOG_BIT_SPEC: MetadataSpec =
-        *<Self::VM as VMBinding>::VMObjectModel::GLOBAL_LOG_BIT_SPEC.as_spec();
+    const UNLOG_BIT_SPEC: MetadataSpec = *<Self::VM as VMBinding>::GLOBAL_LOG_BIT_SPEC.as_spec();
 
     /// Flush thread-local buffers or remembered sets.
     /// Normally this is called by the slow-path implementation whenever the thread-local buffers are full.

src/plan/generational/gc_work.rs

@@ -99,7 +99,7 @@ impl<E: ProcessEdgesWork> GCWork<E::VM> for ProcessModBuf<E> {
     fn do_work(&mut self, worker: &mut GCWorker<E::VM>, mmtk: &'static MMTK<E::VM>) {
         // Flip the per-object unlogged bits to "unlogged" state.
         for obj in &self.modbuf {
-            <E::VM as VMBinding>::VMObjectModel::GLOBAL_LOG_BIT_SPEC.store_atomic::<E::VM, u8>(
+            <E::VM as VMBinding>::GLOBAL_LOG_BIT_SPEC.store_atomic::<E::VM, u8>(
                 *obj,
                 1,
                 None,

src/plan/generational/global.rs

@@ -11,7 +11,7 @@ use crate::util::statistics::counter::EventCounter;
 use crate::util::Address;
 use crate::util::ObjectReference;
 use crate::util::VMWorkerThread;
-use crate::vm::{ObjectModel, VMBinding};
+use crate::vm::VMBinding;
 use std::sync::atomic::AtomicBool;
 use std::sync::atomic::Ordering;
 use std::sync::{Arc, Mutex};
@@ -87,8 +87,7 @@ impl<VM: VMBinding> CommonGenPlan<VM> {
     /// Returns `true` if the nursery has grown to the extent that it may not be able to be copied
     /// into the mature space.
     fn virtual_memory_exhausted(plan: &dyn GenerationalPlan<VM = VM>) -> bool {
-        ((plan.get_collection_reserved_pages() as f64
-            * VM::VMObjectModel::VM_WORST_CASE_COPY_EXPANSION) as usize)
+        ((plan.get_collection_reserved_pages() as f64 * VM::VM_WORST_CASE_COPY_EXPANSION) as usize)
             > plan.get_mature_physical_pages_available()
     }
 

src/plan/generational/mod.rs

@@ -11,7 +11,6 @@ use crate::policy::space::Space;
 use crate::util::alloc::AllocatorSelector;
 use crate::util::metadata::side_metadata::SideMetadataContext;
 use crate::util::metadata::side_metadata::SideMetadataSpec;
-use crate::vm::ObjectModel;
 use crate::vm::VMBinding;
 use crate::Plan;
 
@@ -60,7 +59,7 @@ pub const GEN_CONSTRAINTS: PlanConstraints = PlanConstraints {
 /// So if a plan calls this, it should not call SideMetadataContext::new_global_specs() again.
 pub fn new_generational_global_metadata_specs<VM: VMBinding>() -> Vec<SideMetadataSpec> {
     let specs = if ACTIVE_BARRIER == BarrierSelector::ObjectBarrier {
-        crate::util::metadata::extract_side_metadata(&[*VM::VMObjectModel::GLOBAL_LOG_BIT_SPEC])
+        crate::util::metadata::extract_side_metadata(&[*VM::GLOBAL_LOG_BIT_SPEC])
     } else {
         vec![]
     };

src/plan/global.rs

@@ -25,7 +25,6 @@ use crate::util::options::PlanSelector;
 use crate::util::statistics::stats::Stats;
 use crate::util::{conversions, ObjectReference};
 use crate::util::{VMMutatorThread, VMWorkerThread};
-use crate::vm::*;
 use downcast_rs::Downcast;
 use enum_map::EnumMap;
 use std::sync::atomic::Ordering;
@@ -225,7 +224,7 @@ pub trait Plan: 'static + HasSpaces + Sync + Downcast {
     fn get_reserved_pages(&self) -> usize {
         let used_pages = self.get_used_pages();
         let collection_reserve = self.get_collection_reserved_pages();
-        let vm_live_bytes = <Self::VM as VMBinding>::VMCollection::vm_live_bytes();
+        let vm_live_bytes = <Self::VM as VMBinding>::vm_live_bytes();
         // Note that `vm_live_bytes` may not be the exact number of bytes in whole pages.  The VM
         // binding is allowed to return an approximate value if it is expensive or impossible to
         // compute the exact number of pages occupied.
@@ -495,7 +494,7 @@ impl<VM: VMBinding> BasePlan<VM> {
             return self.vm_space.trace_object(queue, object);
         }
 
-        VM::VMActivePlan::vm_trace_object::<Q>(queue, object, worker)
+        VM::vm_trace_object::<Q>(queue, object, worker)
     }
 
     pub fn prepare(&mut self, _tls: VMWorkerThread, _full_heap: bool) {

src/plan/markcompact/gc_work.rs

@@ -6,8 +6,6 @@ use crate::scheduler::gc_work::*;
 use crate::scheduler::GCWork;
 use crate::scheduler::GCWorker;
 use crate::scheduler::WorkBucketStage;
-use crate::vm::ActivePlan;
-use crate::vm::Scanning;
 use crate::vm::VMBinding;
 use crate::MMTK;
 use std::marker::PhantomData;
@@ -41,7 +39,7 @@ unsafe impl<VM: VMBinding> Send for UpdateReferences<VM> {}
 impl<VM: VMBinding> GCWork<VM> for UpdateReferences<VM> {
     fn do_work(&mut self, worker: &mut GCWorker<VM>, mmtk: &'static MMTK<VM>) {
         // The following needs to be done right before the second round of root scanning
-        VM::VMScanning::prepare_for_roots_re_scanning();
+        VM::prepare_for_roots_re_scanning();
         mmtk.state.prepare_for_stack_scanning();
         // Prepare common and base spaces for the 2nd round of transitive closure
         let plan_mut = unsafe { &mut *(self.plan as *mut MarkCompact<VM>) };
@@ -56,7 +54,7 @@ impl<VM: VMBinding> GCWork<VM> for UpdateReferences<VM> {
             .worker_group
             .get_and_clear_worker_live_bytes();
 
-        for mutator in VM::VMActivePlan::mutators() {
+        for mutator in VM::mutators() {
             mmtk.scheduler.work_buckets[WorkBucketStage::SecondRoots].add(ScanMutatorRoots::<
                 MarkCompactForwardingGCWorkContext<VM>,
             >(mutator));

src/plan/sticky/immix/global.rs

@@ -12,7 +12,6 @@ use crate::util::copy::CopySelector;
 use crate::util::copy::CopySemantics;
 use crate::util::metadata::side_metadata::SideMetadataContext;
 use crate::util::statistics::counter::EventCounter;
-use crate::vm::ObjectModel;
 use crate::vm::VMBinding;
 use crate::Plan;
 
@@ -166,7 +165,7 @@ impl<VM: VMBinding> Plan for StickyImmix<VM> {
     fn sanity_check_object(&self, object: crate::util::ObjectReference) -> bool {
         if self.is_current_gc_nursery() {
             // Every reachable object should be logged
-            if !VM::VMObjectModel::GLOBAL_LOG_BIT_SPEC.is_unlogged::<VM>(object, Ordering::SeqCst) {
+            if !VM::GLOBAL_LOG_BIT_SPEC.is_unlogged::<VM>(object, Ordering::SeqCst) {
                 error!("Object {} is not unlogged (all objects that have been traced should be unlogged/mature)", object);
                 return false;
             }

src/policy/copyspace.rs

@@ -149,8 +149,8 @@ impl<VM: VMBinding> CopySpace<VM> {
             true,
             false,
             extract_side_metadata(&[
-                *VM::VMObjectModel::LOCAL_FORWARDING_BITS_SPEC,
-                *VM::VMObjectModel::LOCAL_FORWARDING_POINTER_SPEC,
+                *VM::LOCAL_FORWARDING_BITS_SPEC,
+                *VM::LOCAL_FORWARDING_POINTER_SPEC,
             ]),
         ));
         CopySpace {
@@ -169,8 +169,7 @@ impl<VM: VMBinding> CopySpace<VM> {
         // Clear the metadata if we are using side forwarding status table. Otherwise
         // objects may inherit forwarding status from the previous GC.
         // TODO: Fix performance.
-        if let MetadataSpec::OnSide(side_forwarding_status_table) =
-            *<VM::VMObjectModel as ObjectModel<VM>>::LOCAL_FORWARDING_BITS_SPEC
+        if let MetadataSpec::OnSide(side_forwarding_status_table) = *VM::LOCAL_FORWARDING_BITS_SPEC
         {
             side_forwarding_status_table
                 .bzero_metadata(self.common.start, self.pr.cursor() - self.common.start);