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a8febf2283
We already do this for shstrtab, so might as well do it for strtab. This extracts the string table building code into a separate class. The idea is to use it for other object formats too. I mostly wanted to do this for the general principle, but it does save a little bit on object file size. I tried this on a clang bootstrap and saved 0.54% on the sum of object file sizes (1.14 MB out of 212 MB for a release build). Differential Revision: http://reviews.llvm.org/D3533 git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@207670 91177308-0d34-0410-b5e6-96231b3b80d8
60 lines
1.6 KiB
C++
60 lines
1.6 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_OBJECT_STRINGTABLE_BUILDER_H
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#define LLVM_OBJECT_STRINGTABLE_BUILDER_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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/// \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();
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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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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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