1 //===-- StringSaver.cpp ---------------------------------------------------===// 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 #include "llvm/Support/StringSaver.h" 10 11 using namespace llvm; 12 13 StringRef StringSaver::save(StringRef S) { 14 char *P = Alloc.Allocate<char>(S.size() + 1); 15 if (!S.empty()) 16 memcpy(P, S.data(), S.size()); 17 P[S.size()] = '\0'; 18 return StringRef(P, S.size()); 19 } 20 21 StringRef UniqueStringSaver::save(StringRef S) { 22 auto R = Unique.insert(S); 23 if (R.second) // cache miss, need to actually save the string 24 *R.first = Strings.save(S); // safe replacement with equal value 25 return *R.first; 26 } 27