Ryan Macnak
14dfa1b9ee
Change-Id: I6634dc10fdc8d7523562c0fcc20e3561eb580acf Reviewed-on: https://dart-review.googlesource.com/c/sdk/+/146023 Commit-Queue: Ryan Macnak <rmacnak@google.com> Reviewed-by: Alexander Aprelev <aam@google.com> Reviewed-by: Alexander Markov <alexmarkov@google.com> Reviewed-by: Martin Kustermann <kustermann@google.com>
130 lines
3.5 KiB
C++
130 lines
3.5 KiB
C++
// 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 "vm/field_table.h"
|
|
|
|
#include "platform/atomic.h"
|
|
#include "vm/flags.h"
|
|
#include "vm/growable_array.h"
|
|
#include "vm/heap/heap.h"
|
|
#include "vm/object.h"
|
|
#include "vm/object_graph.h"
|
|
#include "vm/object_store.h"
|
|
#include "vm/raw_object.h"
|
|
#include "vm/visitor.h"
|
|
|
|
namespace dart {
|
|
|
|
FieldTable::~FieldTable() {
|
|
FreeOldTables();
|
|
delete old_tables_; // Allocated in FieldTable::FieldTable()
|
|
free(table_); // Allocated in FieldTable::Grow()
|
|
}
|
|
|
|
void FieldTable::FreeOldTables() {
|
|
while (old_tables_->length() > 0) {
|
|
free(old_tables_->RemoveLast());
|
|
}
|
|
}
|
|
|
|
intptr_t FieldTable::FieldOffsetFor(intptr_t field_id) {
|
|
return field_id * sizeof(InstancePtr); // NOLINT
|
|
}
|
|
|
|
void FieldTable::Register(const Field& field) {
|
|
ASSERT(Thread::Current()->IsMutatorThread());
|
|
if (free_head_ < 0) {
|
|
if (top_ == capacity_) {
|
|
const intptr_t new_capacity = capacity_ + kCapacityIncrement;
|
|
Grow(new_capacity);
|
|
}
|
|
|
|
ASSERT(top_ < capacity_);
|
|
|
|
field.set_field_id(top_);
|
|
table_[top_] = Object::sentinel().raw();
|
|
|
|
++top_;
|
|
return;
|
|
}
|
|
|
|
// Reuse existing free element. This is "slow path" that should only be
|
|
// triggered after hot reload.
|
|
intptr_t reused_free = free_head_;
|
|
free_head_ = Smi::Value(Smi::RawCast(table_[free_head_]));
|
|
field.set_field_id(reused_free);
|
|
table_[reused_free] = Object::sentinel().raw();
|
|
}
|
|
|
|
void FieldTable::Free(intptr_t field_id) {
|
|
table_[field_id] = Smi::New(free_head_);
|
|
free_head_ = field_id;
|
|
}
|
|
|
|
void FieldTable::SetAt(intptr_t index, InstancePtr raw_instance) {
|
|
ASSERT(index < capacity_);
|
|
table_[index] = raw_instance;
|
|
}
|
|
|
|
void FieldTable::AllocateIndex(intptr_t index) {
|
|
if (index >= capacity_) {
|
|
const intptr_t new_capacity = index + kCapacityIncrement;
|
|
Grow(new_capacity);
|
|
}
|
|
|
|
ASSERT(table_[index] == nullptr);
|
|
if (index >= top_) {
|
|
top_ = index + 1;
|
|
}
|
|
}
|
|
|
|
void FieldTable::Grow(intptr_t new_capacity) {
|
|
ASSERT(new_capacity > capacity_);
|
|
|
|
auto old_table = table_;
|
|
auto new_table = static_cast<InstancePtr*>(
|
|
malloc(new_capacity * sizeof(InstancePtr))); // NOLINT
|
|
intptr_t i;
|
|
for (i = 0; i < top_; i++) {
|
|
new_table[i] = old_table[i];
|
|
}
|
|
for (; i < new_capacity; i++) {
|
|
new_table[i] = InstancePtr();
|
|
}
|
|
capacity_ = new_capacity;
|
|
old_tables_->Add(old_table);
|
|
// Ensure that new_table_ is populated before it is published
|
|
// via store to table_.
|
|
std::atomic_thread_fence(std::memory_order_release);
|
|
table_ = new_table;
|
|
Thread::Current()->field_table_values_ = table_;
|
|
}
|
|
|
|
FieldTable* FieldTable::Clone() {
|
|
FieldTable* clone = new FieldTable();
|
|
auto new_table = static_cast<InstancePtr*>(
|
|
malloc(capacity_ * sizeof(InstancePtr))); // NOLINT
|
|
memmove(new_table, table_, top_ * sizeof(InstancePtr));
|
|
ASSERT(clone->table_ == nullptr);
|
|
clone->table_ = new_table;
|
|
clone->capacity_ = capacity_;
|
|
clone->top_ = top_;
|
|
return clone;
|
|
}
|
|
|
|
void FieldTable::VisitObjectPointers(ObjectPointerVisitor* visitor) {
|
|
// GC might try to visit field table before it's isolate done setting it up.
|
|
if (table_ == nullptr) {
|
|
return;
|
|
}
|
|
|
|
ASSERT(visitor != NULL);
|
|
visitor->set_gc_root_type("static fields table");
|
|
visitor->VisitPointers(reinterpret_cast<ObjectPtr*>(&table_[0]),
|
|
reinterpret_cast<ObjectPtr*>(&table_[top_ - 1]));
|
|
visitor->clear_gc_root_type();
|
|
}
|
|
|
|
} // namespace dart
|