95 lines
2.5 KiB
C
95 lines
2.5 KiB
C
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//===- StringTableBuilder.h - String table building utility -----*- 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_MC_STRINGTABLEBUILDER_H
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#define LLVM_MC_STRINGTABLEBUILDER_H
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#include "llvm/ADT/CachedHashString.h"
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#include "llvm/ADT/DenseMap.h"
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#include "llvm/ADT/StringRef.h"
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#include <cstddef>
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#include <cstdint>
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namespace llvm {
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class raw_ostream;
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/// Utility for building string tables with deduplicated suffixes.
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class StringTableBuilder {
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public:
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enum Kind {
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ELF,
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WinCOFF,
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MachO,
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MachO64,
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MachOLinked,
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MachO64Linked,
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RAW,
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DWARF,
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XCOFF
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};
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private:
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DenseMap<CachedHashStringRef, size_t> StringIndexMap;
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size_t Size = 0;
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Kind K;
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unsigned Alignment;
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bool Finalized = false;
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void finalizeStringTable(bool Optimize);
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void initSize();
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public:
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StringTableBuilder(Kind K, unsigned Alignment = 1);
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~StringTableBuilder();
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/// Add a string to the builder. Returns the position of S in the
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/// table. The position will be changed if finalize is used.
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/// Can only be used before the table is finalized.
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size_t add(CachedHashStringRef S);
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size_t add(StringRef S) { return add(CachedHashStringRef(S)); }
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/// Analyze the strings and build the final table. No more strings can
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/// be added after this point.
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void finalize();
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/// Finalize the string table without reording it. In this mode, offsets
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/// returned by add will still be valid.
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void finalizeInOrder();
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/// Get the offest of a string in the string table. Can only be used
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/// after the table is finalized.
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size_t getOffset(CachedHashStringRef S) const;
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size_t getOffset(StringRef S) const {
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return getOffset(CachedHashStringRef(S));
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}
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/// Check if a string is contained in the string table. Since this class
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/// doesn't store the string values, this function can be used to check if
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/// storage needs to be done prior to adding the string.
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bool contains(StringRef S) const {
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return contains(CachedHashStringRef(S));
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}
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bool contains(CachedHashStringRef S) const {
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return StringIndexMap.count(S);
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}
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size_t getSize() const { return Size; }
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void clear();
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void write(raw_ostream &OS) const;
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void write(uint8_t *Buf) const;
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private:
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bool isFinalized() const { return Finalized; }
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};
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} // end namespace llvm
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#endif // LLVM_MC_STRINGTABLEBUILDER_H
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