lib/Support/StringPool.cpp

   1 //===-- StringPool.cpp - Interned string pool -----------------------------===//
   2 //
   3 //                     The LLVM Compiler Infrastructure
   4 //
   5 // This file is distributed under the University of Illinois Open Source
   6 // License. See LICENSE.TXT for details.
   7 //
   8 //===----------------------------------------------------------------------===//
   9 //
  10 // This file implements the StringPool class.
  11 //
  12 //===----------------------------------------------------------------------===//
  13
  14 #include "llvm/Support/StringPool.h"
  15 #include "llvm/ADT/StringRef.h"
  16
  17 using namespace llvm;
  18
  19 StringPool::StringPool() {}
  20
  21 StringPool::~StringPool() {
  22   assert(InternTable.empty() && "PooledStringPtr leaked!");
  23 }
  24
  25 PooledStringPtr StringPool::intern(const StringRef &Key) {
  26   table_t::iterator I = InternTable.find(Key);
  27   if (I != InternTable.end())
  28     return PooledStringPtr(&*I);
  29
  30   entry_t *S = entry_t::Create(Key.begin(), Key.end());
  31   S->getValue().Pool = this;
  32   InternTable.insert(S);
  33
  34   return PooledStringPtr(S);
  35 }