// 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/base/internal/raw_logging.h"
#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/str_cat.h"

namespace absl {
ABSL_NAMESPACE_BEGIN
namespace cord_internal {

ABSL_CONST_INIT std::atomic<bool> shallow_subcords_enabled(
    kCordShallowSubcordsDefault);

void RefcountAndFlags::IncrementOverflow() {
  ABSL_INTERNAL_LOG(FATAL, "refcount is too large and vulnerable to overflow");
}

void LogFatalNodeType(CordRep* rep) {
  ABSL_INTERNAL_LOG(FATAL, absl::StrCat("Unexpected node type: ",
                                        static_cast<int>(rep->tag)));
}

void CordRep::Destroy(CordRep* rep) {
  assert(rep != nullptr);

  while (true) {
    assert(!rep->refcount.IsImmortal());
    if (rep->tag == BTREE) {
      CordRepBtree::Destroy(rep->btree());
      return;
    } else if (rep->tag == EXTERNAL) {
      CordRepExternal::Delete(rep);
      return;
    } else if (rep->tag == SUBSTRING) {
      CordRepSubstring* rep_substring = rep->substring();
      rep = rep_substring->child;
      delete rep_substring;
      if (rep->refcount.Decrement()) {
        return;
      }
    } else if (rep->tag == CRC) {
      CordRepCrc::Destroy(rep->crc());
      return;
    } else {
      assert(rep->IsFlat());
      CordRepFlat::Delete(rep);
      return;
    }
  }
}

}  // namespace cord_internal
ABSL_NAMESPACE_END
}  // namespace absl
