lib/Support/StringPool.cpp

   1 //===-- StringPool.cpp - Interned string pool -----------------------------===//
   2 //
   3 // Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
   4 // See https://llvm.org/LICENSE.txt for license information.
   5 // SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
   6 //
   7 //===----------------------------------------------------------------------===//
   8 //
   9 // This file implements the StringPool class.
  10 //
  11 //===----------------------------------------------------------------------===//
  12
  13 #include "llvm/Support/StringPool.h"
  14 #include "llvm/ADT/StringRef.h"
  15
  16 using namespace llvm;
  17
  18 StringPool::StringPool() {}
  19
  20 StringPool::~StringPool() {
  21   assert(InternTable.empty() && "PooledStringPtr leaked!");
  22 }
  23
  24 PooledStringPtr StringPool::intern(StringRef Key) {
  25   table_t::iterator I = InternTable.find(Key);
  26   if (I != InternTable.end())
  27     return PooledStringPtr(&*I);
  28
  29   entry_t *S = entry_t::Create(Key);
  30   S->getValue().Pool = this;
  31   InternTable.insert(S);
  32
  33   return PooledStringPtr(S);
  34 }