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4edcbaec90
This is a follow-up from r207670 which did the same for ELF. Differential Revision: http://reviews.llvm.org/D5530 git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@218636 91177308-0d34-0410-b5e6-96231b3b80d8
67 lines
1.7 KiB
C++
67 lines
1.7 KiB
C++
//===-- StringTableBuilder.h - String table building utility ------*- C++ -*-=//
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//
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// The LLVM Compiler Infrastructure
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//
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// This file is distributed under the University of Illinois Open Source
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// License. See LICENSE.TXT for details.
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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/SmallString.h"
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#include "llvm/ADT/StringMap.h"
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#include <cassert>
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namespace llvm {
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/// \brief Utility for building string tables with deduplicated suffixes.
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class StringTableBuilder {
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SmallString<256> StringTable;
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StringMap<size_t> StringIndexMap;
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public:
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/// \brief Add a string to the builder. Returns a StringRef to the internal
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/// copy of s. Can only be used before the table is finalized.
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StringRef add(StringRef s) {
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assert(!isFinalized());
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return StringIndexMap.GetOrCreateValue(s, 0).getKey();
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}
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enum Kind {
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ELF,
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WinCOFF
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};
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/// \brief 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(Kind kind);
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/// \brief Retrieve the string table data. Can only be used after the table
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/// is finalized.
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StringRef data() {
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assert(isFinalized());
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return StringTable;
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}
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/// \brief 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(StringRef s) {
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assert(isFinalized());
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assert(StringIndexMap.count(s) && "String is not in table!");
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return StringIndexMap[s];
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}
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void clear();
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private:
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bool isFinalized() {
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return !StringTable.empty();
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}
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};
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} // end llvm namespace
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#endif
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