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to reflect the new license. We understand that people may be surprised that we're moving the header entirely to discuss the new license. We checked this carefully with the Foundation's lawyer and we believe this is the correct approach. Essentially, all code in the project is now made available by the LLVM project under our new license, so you will see that the license headers include that license only. Some of our contributors have contributed code under our old license, and accordingly, we have retained a copy of our old license notice in the top-level files in each project and repository. llvm-svn: 351636
58 lines
1.9 KiB
C++
58 lines
1.9 KiB
C++
//===- llvm/Support/StringSaver.h -------------------------------*- C++ -*-===//
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//
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// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
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// See https://llvm.org/LICENSE.txt for license information.
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// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
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//
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//===----------------------------------------------------------------------===//
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#ifndef LLVM_SUPPORT_STRINGSAVER_H
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#define LLVM_SUPPORT_STRINGSAVER_H
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#include "llvm/ADT/DenseSet.h"
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#include "llvm/ADT/StringRef.h"
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#include "llvm/ADT/Twine.h"
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#include "llvm/Support/Allocator.h"
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namespace llvm {
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/// Saves strings in the provided stable storage and returns a
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/// StringRef with a stable character pointer.
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class StringSaver final {
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BumpPtrAllocator &Alloc;
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public:
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StringSaver(BumpPtrAllocator &Alloc) : Alloc(Alloc) {}
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// All returned strings are null-terminated: *save(S).end() == 0.
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StringRef save(const char *S) { return save(StringRef(S)); }
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StringRef save(StringRef S);
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StringRef save(const Twine &S) { return save(StringRef(S.str())); }
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StringRef save(const std::string &S) { return save(StringRef(S)); }
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};
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/// Saves strings in the provided stable storage and returns a StringRef with a
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/// stable character pointer. Saving the same string yields the same StringRef.
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///
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/// Compared to StringSaver, it does more work but avoids saving the same string
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/// multiple times.
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///
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/// Compared to StringPool, it performs fewer allocations but doesn't support
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/// refcounting/deletion.
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class UniqueStringSaver final {
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StringSaver Strings;
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llvm::DenseSet<llvm::StringRef> Unique;
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public:
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UniqueStringSaver(BumpPtrAllocator &Alloc) : Strings(Alloc) {}
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// All returned strings are null-terminated: *save(S).end() == 0.
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StringRef save(const char *S) { return save(StringRef(S)); }
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StringRef save(StringRef S);
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StringRef save(const Twine &S) { return save(StringRef(S.str())); }
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StringRef save(const std::string &S) { return save(StringRef(S)); }
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};
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}
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#endif
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