forked from OSchip/llvm-project
89 lines
2.3 KiB
C++
89 lines
2.3 KiB
C++
//===-- StringTableBuilder.cpp - String table building utility ------------===//
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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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#include "llvm/MC/StringTableBuilder.h"
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#include "llvm/ADT/SmallVector.h"
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#include "llvm/Support/COFF.h"
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#include "llvm/Support/Endian.h"
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using namespace llvm;
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static bool compareBySuffix(StringRef a, StringRef b) {
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size_t sizeA = a.size();
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size_t sizeB = b.size();
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size_t len = std::min(sizeA, sizeB);
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for (size_t i = 0; i < len; ++i) {
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char ca = a[sizeA - i - 1];
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char cb = b[sizeB - i - 1];
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if (ca != cb)
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return ca > cb;
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}
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return sizeA > sizeB;
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}
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void StringTableBuilder::finalize(Kind kind) {
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SmallVector<StringRef, 8> Strings;
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Strings.reserve(StringIndexMap.size());
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for (auto i = StringIndexMap.begin(), e = StringIndexMap.end(); i != e; ++i)
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Strings.push_back(i->getKey());
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std::sort(Strings.begin(), Strings.end(), compareBySuffix);
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switch (kind) {
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case ELF:
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case MachO:
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// Start the table with a NUL byte.
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StringTable += '\x00';
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break;
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case WinCOFF:
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// Make room to write the table size later.
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StringTable.append(4, '\x00');
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break;
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}
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StringRef Previous;
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for (StringRef s : Strings) {
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if (kind == WinCOFF)
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assert(s.size() > COFF::NameSize && "Short string in COFF string table!");
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if (Previous.endswith(s)) {
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StringIndexMap[s] = StringTable.size() - 1 - s.size();
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continue;
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}
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StringIndexMap[s] = StringTable.size();
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StringTable += s;
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StringTable += '\x00';
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Previous = s;
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}
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switch (kind) {
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case ELF:
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break;
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case MachO:
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// Pad to multiple of 4.
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while (StringTable.size() % 4)
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StringTable += '\x00';
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break;
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case WinCOFF:
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// Write the table size in the first word.
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assert(StringTable.size() <= std::numeric_limits<uint32_t>::max());
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uint32_t size = static_cast<uint32_t>(StringTable.size());
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support::endian::write<uint32_t, support::little, support::unaligned>(
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StringTable.data(), size);
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break;
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}
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}
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void StringTableBuilder::clear() {
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StringTable.clear();
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StringIndexMap.clear();
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}
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