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// Copyright 2020 the V8 project authors. All rights reserved.
// Use of this source code is governed by a BSD-style license that can be
// found in the LICENSE file.
#include "src/heap/weak-object-worklists.h"
#include "src/heap/heap-inl.h"
#include "src/heap/heap.h"
#include "src/heap/worklist.h"
#include "src/objects/hash-table.h"
#include "src/objects/heap-object.h"
#include "src/objects/js-function.h"
#include "src/objects/js-weak-refs-inl.h"
#include "src/objects/js-weak-refs.h"
#include "src/objects/shared-function-info.h"
#include "src/objects/transitions.h"
namespace v8 {
namespace internal {
void WeakObjects::UpdateAfterScavenge() {
#define INVOKE_UPDATE(_, name, Name) Update##Name(name);
WEAK_OBJECT_WORKLISTS(INVOKE_UPDATE)
#undef INVOKE_UPDATE
}
void WeakObjects::UpdateTransitionArrays(
WeakObjectWorklist<TransitionArray>& transition_arrays) {
DCHECK(!ContainsYoungObjects(transition_arrays));
}
void WeakObjects::UpdateEphemeronHashTables(
WeakObjectWorklist<EphemeronHashTable>& ephemeron_hash_tables) {
ephemeron_hash_tables.Update(
[](EphemeronHashTable slot_in, EphemeronHashTable* slot_out) -> bool {
EphemeronHashTable forwarded = ForwardingAddress(slot_in);
if (!forwarded.is_null()) {
*slot_out = forwarded;
return true;
}
return false;
});
}
namespace {
bool EphemeronUpdater(Ephemeron slot_in, Ephemeron* slot_out) {
HeapObject key = slot_in.key;
HeapObject value = slot_in.value;
HeapObject forwarded_key = ForwardingAddress(key);
HeapObject forwarded_value = ForwardingAddress(value);
if (!forwarded_key.is_null() && !forwarded_value.is_null()) {
*slot_out = Ephemeron{forwarded_key, forwarded_value};
return true;
}
return false;
}
} // anonymous namespace
void WeakObjects::UpdateCurrentEphemerons(
WeakObjectWorklist<Ephemeron>& current_ephemerons) {
current_ephemerons.Update(EphemeronUpdater);
}
void WeakObjects::UpdateNextEphemerons(
WeakObjectWorklist<Ephemeron>& next_ephemerons) {
next_ephemerons.Update(EphemeronUpdater);
}
void WeakObjects::UpdateDiscoveredEphemerons(
WeakObjectWorklist<Ephemeron>& discovered_ephemerons) {
discovered_ephemerons.Update(EphemeronUpdater);
}
void WeakObjects::UpdateWeakReferences(
WeakObjectWorklist<HeapObjectAndSlot>& weak_references) {
weak_references.Update(
[](HeapObjectAndSlot slot_in, HeapObjectAndSlot* slot_out) -> bool {
HeapObject heap_obj = slot_in.first;
HeapObject forwarded = ForwardingAddress(heap_obj);
if (!forwarded.is_null()) {
ptrdiff_t distance_to_slot =
slot_in.second.address() - slot_in.first.ptr();
Address new_slot = forwarded.ptr() + distance_to_slot;
slot_out->first = forwarded;
slot_out->second = HeapObjectSlot(new_slot);
return true;
}
return false;
});
}
void WeakObjects::UpdateWeakObjectsInCode(
WeakObjectWorklist<HeapObjectAndCode>& weak_objects_in_code) {
weak_objects_in_code.Update(
[](HeapObjectAndCode slot_in, HeapObjectAndCode* slot_out) -> bool {
HeapObject heap_obj = slot_in.first;
HeapObject forwarded = ForwardingAddress(heap_obj);
if (!forwarded.is_null()) {
slot_out->first = forwarded;
slot_out->second = slot_in.second;
return true;
}
return false;
});
}
void WeakObjects::UpdateJSWeakRefs(
WeakObjectWorklist<JSWeakRef>& js_weak_refs) {
js_weak_refs.Update(
[](JSWeakRef js_weak_ref_in, JSWeakRef* js_weak_ref_out) -> bool {
JSWeakRef forwarded = ForwardingAddress(js_weak_ref_in);
if (!forwarded.is_null()) {
*js_weak_ref_out = forwarded;
return true;
}
return false;
});
}
void WeakObjects::UpdateWeakCells(WeakObjectWorklist<WeakCell>& weak_cells) {
// TODO(syg, marja): Support WeakCells in the young generation.
DCHECK(!ContainsYoungObjects(weak_cells));
}
void WeakObjects::UpdateCodeFlushingCandidates(
WeakObjectWorklist<SharedFunctionInfo>& code_flushing_candidates) {
DCHECK(!ContainsYoungObjects(code_flushing_candidates));
}
void WeakObjects::UpdateFlushedJSFunctions(
WeakObjectWorklist<JSFunction>& flushed_js_functions) {
flushed_js_functions.Update(
[](JSFunction slot_in, JSFunction* slot_out) -> bool {
JSFunction forwarded = ForwardingAddress(slot_in);
if (!forwarded.is_null()) {
*slot_out = forwarded;
return true;
}
return false;
});
}
void WeakObjects::UpdateBaselineFlushingCandidates(
WeakObjectWorklist<JSFunction>& baseline_flush_candidates) {
baseline_flush_candidates.Update(
[](JSFunction slot_in, JSFunction* slot_out) -> bool {
JSFunction forwarded = ForwardingAddress(slot_in);
if (!forwarded.is_null()) {
*slot_out = forwarded;
return true;
}
return false;
});
}
#ifdef DEBUG
template <typename Type>
bool WeakObjects::ContainsYoungObjects(WeakObjectWorklist<Type>& worklist) {
bool result = false;
worklist.Iterate([&result](Type candidate) {
if (Heap::InYoungGeneration(candidate)) {
result = true;
}
});
return result;
}
#endif
} // namespace internal
} // namespace v8
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