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annotate lib/MC/StringTableBuilder.cpp @ 83:60c9769439b8 LLVM3.7

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LLVM 3.7
author Tatsuki IHA <e125716@ie.u-ryukyu.ac.jp>
date Wed, 18 Feb 2015 14:55:36 +0900
parents 54457678186b
children 7d135dc70f03
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1 //===-- StringTableBuilder.cpp - String table building utility ------------===//
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2 //
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3 // The LLVM Compiler Infrastructure
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4 //
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5 // This file is distributed under the University of Illinois Open Source
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6 // License. See LICENSE.TXT for details.
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7 //
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8 //===----------------------------------------------------------------------===//
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9
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10 #include "llvm/MC/StringTableBuilder.h"
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11 #include "llvm/ADT/SmallVector.h"
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12 #include "llvm/Support/COFF.h"
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13 #include "llvm/Support/Endian.h"
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14
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15 using namespace llvm;
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16
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17 static bool compareBySuffix(StringRef a, StringRef b) {
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18 size_t sizeA = a.size();
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19 size_t sizeB = b.size();
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20 size_t len = std::min(sizeA, sizeB);
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21 for (size_t i = 0; i < len; ++i) {
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22 char ca = a[sizeA - i - 1];
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23 char cb = b[sizeB - i - 1];
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24 if (ca != cb)
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25 return ca > cb;
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26 }
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27 return sizeA > sizeB;
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28 }
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29
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30 void StringTableBuilder::finalize(Kind kind) {
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31 SmallVector<StringRef, 8> Strings;
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32 Strings.reserve(StringIndexMap.size());
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33
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34 for (auto i = StringIndexMap.begin(), e = StringIndexMap.end(); i != e; ++i)
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35 Strings.push_back(i->getKey());
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36
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37 std::sort(Strings.begin(), Strings.end(), compareBySuffix);
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38
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39 switch (kind) {
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40 case ELF:
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41 case MachO:
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42 // Start the table with a NUL byte.
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43 StringTable += '\x00';
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44 break;
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45 case WinCOFF:
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46 // Make room to write the table size later.
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47 StringTable.append(4, '\x00');
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48 break;
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49 }
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50
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51 StringRef Previous;
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52 for (StringRef s : Strings) {
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53 if (kind == WinCOFF)
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54 assert(s.size() > COFF::NameSize && "Short string in COFF string table!");
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55
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56 if (Previous.endswith(s)) {
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57 StringIndexMap[s] = StringTable.size() - 1 - s.size();
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58 continue;
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59 }
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60
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61 StringIndexMap[s] = StringTable.size();
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62 StringTable += s;
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63 StringTable += '\x00';
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64 Previous = s;
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65 }
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66
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67 switch (kind) {
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68 case ELF:
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69 break;
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70 case MachO:
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71 // Pad to multiple of 4.
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72 while (StringTable.size() % 4)
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73 StringTable += '\x00';
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74 break;
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75 case WinCOFF:
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76 // Write the table size in the first word.
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77 assert(StringTable.size() <= std::numeric_limits<uint32_t>::max());
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78 uint32_t size = static_cast<uint32_t>(StringTable.size());
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79 support::endian::write<uint32_t, support::little, support::unaligned>(
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80 StringTable.data(), size);
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81 break;
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82 }
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83 }
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84
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85 void StringTableBuilder::clear() {
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86 StringTable.clear();
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87 StringIndexMap.clear();
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88 }