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//===- StringPool.h ---------------------------------------------*- C++ -*-===//
//
// 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
//
//===----------------------------------------------------------------------===//
#ifndef LLVM_DWARFLINKER_STRINGPOOL_H
#define LLVM_DWARFLINKER_STRINGPOOL_H
#include "llvm/ADT/ConcurrentHashtable.h"
#include "llvm/CodeGen/DwarfStringPoolEntry.h"
#include "llvm/Support/Allocator.h"
#include "llvm/Support/PerThreadBumpPtrAllocator.h"
#include <string_view>
namespace llvm {
namespace dwarf_linker {
/// StringEntry keeps data of the string: the length, external offset
/// and a string body which is placed right after StringEntry.
using StringEntry = StringMapEntry<std::nullopt_t>;
class StringPoolEntryInfo {
public:
/// \returns Hash value for the specified \p Key.
static inline uint64_t getHashValue(const StringRef &Key) {
return xxh3_64bits(Key);
}
/// \returns true if both \p LHS and \p RHS are equal.
static inline bool isEqual(const StringRef &LHS, const StringRef &RHS) {
return LHS == RHS;
}
/// \returns key for the specified \p KeyData.
static inline StringRef getKey(const StringEntry &KeyData) {
return KeyData.getKey();
}
/// \returns newly created object of KeyDataTy type.
static inline StringEntry *
create(const StringRef &Key,
llvm::parallel::PerThreadBumpPtrAllocator &Allocator) {
return StringEntry::create(Key, Allocator);
}
};
class StringPool
: public ConcurrentHashTableByPtr<StringRef, StringEntry,
llvm::parallel::PerThreadBumpPtrAllocator,
StringPoolEntryInfo> {
public:
StringPool()
: ConcurrentHashTableByPtr<StringRef, StringEntry,
llvm::parallel::PerThreadBumpPtrAllocator,
StringPoolEntryInfo>(Allocator) {}
StringPool(size_t InitialSize)
: ConcurrentHashTableByPtr<StringRef, StringEntry,
llvm::parallel::PerThreadBumpPtrAllocator,
StringPoolEntryInfo>(Allocator, InitialSize) {}
llvm::parallel::PerThreadBumpPtrAllocator &getAllocatorRef() {
return Allocator;
}
void clear() { Allocator.Reset(); }
private:
llvm::parallel::PerThreadBumpPtrAllocator Allocator;
};
} // namespace dwarf_linker
} // end namespace llvm
#endif // LLVM_DWARFLINKER_STRINGPOOL_H
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