src/objects/feedback-cell-inl.h

// Copyright 2018 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.

#ifndef V8_OBJECTS_FEEDBACK_CELL_INL_H_
#define V8_OBJECTS_FEEDBACK_CELL_INL_H_

#include "src/execution/tiering-manager.h"
#include "src/heap/heap-write-barrier-inl.h"
#include "src/objects/feedback-cell.h"
#include "src/objects/feedback-vector-inl.h"
#include "src/objects/objects-inl.h"
#include "src/objects/struct-inl.h"

// Has to be the last include (doesn't have include guards):
#include "src/objects/object-macros.h"

namespace v8 {
namespace internal {

#include "torque-generated/src/objects/feedback-cell-tq-inl.inc"

TQ_OBJECT_CONSTRUCTORS_IMPL(FeedbackCell)

RELEASE_ACQUIRE_ACCESSORS(FeedbackCell, value, Tagged<HeapObject>, kValueOffset)

void FeedbackCell::clear_padding() {
  if (FeedbackCell::kAlignedSize == FeedbackCell::kUnalignedSize) return;
  DCHECK_GE(FeedbackCell::kAlignedSize, FeedbackCell::kUnalignedSize);
  memset(reinterpret_cast<uint8_t*>(address() + FeedbackCell::kUnalignedSize),
         0, FeedbackCell::kAlignedSize - FeedbackCell::kUnalignedSize);
}

void FeedbackCell::reset_feedback_vector(
    base::Optional<std::function<void(
        Tagged<HeapObject> object, ObjectSlot slot, Tagged<HeapObject> target)>>
        gc_notify_updated_slot) {
  clear_interrupt_budget();
  if (IsUndefined(value()) || IsClosureFeedbackCellArray(value())) return;

  CHECK(IsFeedbackVector(value()));
  Tagged<ClosureFeedbackCellArray> closure_feedback_cell_array =
      FeedbackVector::cast(value())->closure_feedback_cell_array();
  set_value(closure_feedback_cell_array, kReleaseStore);
  if (gc_notify_updated_slot) {
    (*gc_notify_updated_slot)(*this, RawField(FeedbackCell::kValueOffset),
                              closure_feedback_cell_array);
  }
}

void FeedbackCell::clear_interrupt_budget() {
  // This value is always reset to a proper budget before it's used.
  set_interrupt_budget(0);
}

void FeedbackCell::IncrementClosureCount(Isolate* isolate) {
  ReadOnlyRoots r(isolate);
  if (map() == r.no_closures_cell_map()) {
    set_map(r.one_closure_cell_map());
  } else if (map() == r.one_closure_cell_map()) {
    set_map(r.many_closures_cell_map());
  } else {
    DCHECK(map() == r.many_closures_cell_map());
  }
}

}  // namespace internal
}  // namespace v8

#include "src/objects/object-macros-undef.h"

#endif  // V8_OBJECTS_FEEDBACK_CELL_INL_H_