mirror of
https://github.com/RPCS3/llvm-mirror.git
synced 2024-10-22 20:43:44 +02:00
1f76d4c2b7
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 llvm-svn: 207670
60 lines
1.6 KiB
C++
60 lines
1.6 KiB
C++
//===-- StringTableBuilder.h - String table building utility ------*- C++ -*-=//
|
|
//
|
|
// The LLVM Compiler Infrastructure
|
|
//
|
|
// This file is distributed under the University of Illinois Open Source
|
|
// License. See LICENSE.TXT for details.
|
|
//
|
|
//===----------------------------------------------------------------------===//
|
|
|
|
#ifndef LLVM_OBJECT_STRINGTABLE_BUILDER_H
|
|
#define LLVM_OBJECT_STRINGTABLE_BUILDER_H
|
|
|
|
#include "llvm/ADT/SmallString.h"
|
|
#include "llvm/ADT/StringMap.h"
|
|
#include <cassert>
|
|
|
|
namespace llvm {
|
|
|
|
/// \brief Utility for building string tables with deduplicated suffixes.
|
|
class StringTableBuilder {
|
|
SmallString<256> StringTable;
|
|
StringMap<size_t> StringIndexMap;
|
|
|
|
public:
|
|
/// \brief Add a string to the builder. Returns a StringRef to the internal
|
|
/// copy of s. Can only be used before the table is finalized.
|
|
StringRef add(StringRef s) {
|
|
assert(!isFinalized());
|
|
return StringIndexMap.GetOrCreateValue(s, 0).getKey();
|
|
}
|
|
|
|
/// \brief Analyze the strings and build the final table. No more strings can
|
|
/// be added after this point.
|
|
void finalize();
|
|
|
|
/// \brief Retrieve the string table data. Can only be used after the table
|
|
/// is finalized.
|
|
StringRef data() {
|
|
assert(isFinalized());
|
|
return StringTable;
|
|
}
|
|
|
|
/// \brief Get the offest of a string in the string table. Can only be used
|
|
/// after the table is finalized.
|
|
size_t getOffset(StringRef s) {
|
|
assert(isFinalized());
|
|
assert(StringIndexMap.count(s) && "String is not in table!");
|
|
return StringIndexMap[s];
|
|
}
|
|
|
|
private:
|
|
bool isFinalized() {
|
|
return !StringTable.empty();
|
|
}
|
|
};
|
|
|
|
} // end llvm namespace
|
|
|
|
#endif
|