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// Copyright 2020 The Abseil Authors.
//
// Licensed under the Apache License, Version 2.0 (the "License");
// you may not use this file except in compliance with the License.
// You may obtain a copy of the License at
//
// https://www.apache.org/licenses/LICENSE-2.0
//
// Unless required by applicable law or agreed to in writing, software
// distributed under the License is distributed on an "AS IS" BASIS,
// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
// See the License for the specific language governing permissions and
// limitations under the License.
#include "absl/strings/internal/cord_internal.h"
#include <atomic>
#include <cassert>
#include <memory>
#include "absl/container/inlined_vector.h"
#include "absl/strings/internal/cord_rep_btree.h"
#include "absl/strings/internal/cord_rep_crc.h"
#include "absl/strings/internal/cord_rep_flat.h"
#include "absl/strings/internal/cord_rep_ring.h"
namespace absl {
ABSL_NAMESPACE_BEGIN
namespace cord_internal {
ABSL_CONST_INIT std::atomic<bool> cord_btree_enabled(kCordEnableBtreeDefault);
ABSL_CONST_INIT std::atomic<bool> cord_ring_buffer_enabled(
kCordEnableRingBufferDefault);
ABSL_CONST_INIT std::atomic<bool> shallow_subcords_enabled(
kCordShallowSubcordsDefault);
ABSL_CONST_INIT std::atomic<bool> cord_btree_exhaustive_validation(false);
void CordRep::Destroy(CordRep* rep) {
assert(rep != nullptr);
absl::InlinedVector<CordRep*, Constants::kInlinedVectorSize> pending;
while (true) {
assert(!rep->refcount.IsImmortal());
if (rep->tag == CONCAT) {
CordRepConcat* rep_concat = rep->concat();
CordRep* right = rep_concat->right;
if (!right->refcount.Decrement()) {
pending.push_back(right);
}
CordRep* left = rep_concat->left;
delete rep_concat;
rep = nullptr;
if (!left->refcount.Decrement()) {
rep = left;
continue;
}
} else if (rep->tag == BTREE) {
CordRepBtree::Destroy(rep->btree());
rep = nullptr;
} else if (rep->tag == RING) {
CordRepRing::Destroy(rep->ring());
rep = nullptr;
} else if (rep->tag == EXTERNAL) {
CordRepExternal::Delete(rep);
rep = nullptr;
} else if (rep->tag == SUBSTRING) {
CordRepSubstring* rep_substring = rep->substring();
CordRep* child = rep_substring->child;
delete rep_substring;
rep = nullptr;
if (!child->refcount.Decrement()) {
rep = child;
continue;
}
} else if (rep->tag == CRC) {
CordRepCrc::Destroy(rep->crc());
rep = nullptr;
} else {
CordRepFlat::Delete(rep);
rep = nullptr;
}
if (!pending.empty()) {
rep = pending.back();
pending.pop_back();
} else {
break;
}
}
}
} // namespace cord_internal
ABSL_NAMESPACE_END
} // namespace absl
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