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// Copyright (c) 2020, the Dart project authors. Please see the AUTHORS file
// for details. All rights reserved. Use of this source code is governed by a
// BSD-style license that can be found in the LICENSE file.
#include "platform/assert.h"
#include "platform/atomic.h"
#include "vm/bitfield.h"
#include "vm/class_id.h"
#include "vm/globals.h"
#include "vm/growable_array.h"
#include "vm/tagged_pointer.h"
namespace dart {
class Isolate;
class Field;
class FieldInvalidator;
class FieldTable {
explicit FieldTable(Isolate* isolate)
: top_(0),
old_tables_(new MallocGrowableArray<InstancePtr*>()),
is_ready_to_use_(isolate == nullptr) {}
bool IsReadyToUse() const;
void MarkReadyToUse();
intptr_t NumFieldIds() const { return top_; }
intptr_t Capacity() const { return capacity_; }
InstancePtr* table() { return table_; }
void FreeOldTables();
// Used by the generated code.
static intptr_t FieldOffsetFor(intptr_t field_id);
bool IsValidIndex(intptr_t index) const { return index >= 0 && index < top_; }
// Returns whether registering this field caused a growth in the backing
// store.
bool Register(const Field& field, intptr_t expected_field_id = -1);
void AllocateIndex(intptr_t index);
// Static field elements are being freed only during isolate reload
// when initially created static field have to get remapped to point
// to an existing static field value.
void Free(intptr_t index);
InstancePtr At(intptr_t index) const {
return table_[index];
void SetAt(intptr_t index, InstancePtr raw_instance);
FieldTable* Clone(Isolate* for_isolate);
void VisitObjectPointers(ObjectPointerVisitor* visitor);
static const int kInitialCapacity = 512;
static const int kCapacityIncrement = 256;
friend class GCMarker;
friend class MarkingWeakVisitor;
friend class Scavenger;
friend class ScavengerWeakVisitor;
void Grow(intptr_t new_capacity);
intptr_t top_;
intptr_t capacity_;
// -1 if free list is empty, otherwise index of first empty element. Empty
// elements are organized into linked list - they contain index of next
// element, last element contains -1.
intptr_t free_head_;
InstancePtr* table_;
// When table_ grows and have to reallocated, keep the old one here
// so it will get freed when its are no longer in use.
MallocGrowableArray<InstancePtr*>* old_tables_;
// If non-NULL, it will specify the isolate this field table belongs to.
// Growing the field table will keep the cached field table on the isolate's
// mutator thread up-to-date.
Isolate* isolate_;
// Whether this field table is ready to use by e.g. registering new static
// fields.
bool is_ready_to_use_ = false;
} // namespace dart