third_party/llvm-10.0/llvm/lib/Support/StringPool.cpp

//===-- StringPool.cpp - Interned string pool -----------------------------===//
//
// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
// See https://llvm.org/LICENSE.txt for license information.
// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
//
//===----------------------------------------------------------------------===//
//
// This file implements the StringPool class.
//
//===----------------------------------------------------------------------===//

#include "llvm/Support/StringPool.h"
#include "llvm/ADT/StringRef.h"

using namespace llvm;

StringPool::StringPool() {}

StringPool::~StringPool() {
  assert(InternTable.empty() && "PooledStringPtr leaked!");
}

PooledStringPtr StringPool::intern(StringRef Key) {
  table_t::iterator I = InternTable.find(Key);
  if (I != InternTable.end())
    return PooledStringPtr(&*I);

  entry_t *S = entry_t::Create(Key);
  S->getValue().Pool = this;
  InternTable.insert(S);

  return PooledStringPtr(S);
}