contrib/libs/llvm12/lib/Support/StringSaver.cpp


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//===-- StringSaver.cpp ---------------------------------------------------===// 
// 
// 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 
// 
//===----------------------------------------------------------------------===// 
 
#include "llvm/Support/StringSaver.h" 
 
using namespace llvm; 
 
StringRef StringSaver::save(StringRef S) { 
  char *P = Alloc.Allocate<char>(S.size() + 1); 
  if (!S.empty()) 
    memcpy(P, S.data(), S.size()); 
  P[S.size()] = '\0'; 
  return StringRef(P, S.size()); 
} 
 
StringRef UniqueStringSaver::save(StringRef S) { 
  auto R = Unique.insert(S); 
  if (R.second)                 // cache miss, need to actually save the string 
    *R.first = Strings.save(S); // safe replacement with equal value 
  return *R.first; 
}