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1 //===- MapFile.cpp --------------------------------------------------------===//
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2 //
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3 // Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
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4 // See https://llvm.org/LICENSE.txt for license information.
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5 // SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
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6 //
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7 //===----------------------------------------------------------------------===//
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8 //
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9 // This file implements the /lldmap option. It shows lists in order and
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10 // hierarchically the output sections, input sections, input files and
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11 // symbol:
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12 //
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13 // Address Size Align Out File Symbol
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14 // 00201000 00000015 4 .text
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15 // 00201000 0000000e 4 test.o:(.text)
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16 // 0020100e 00000000 0 local
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17 // 00201005 00000000 0 f(int)
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18 //
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19 //===----------------------------------------------------------------------===//
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20
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21 #include "MapFile.h"
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22 #include "SymbolTable.h"
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23 #include "Symbols.h"
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24 #include "Writer.h"
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25 #include "lld/Common/ErrorHandler.h"
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26 #include "lld/Common/Threads.h"
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27 #include "llvm/Support/raw_ostream.h"
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28
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29 using namespace llvm;
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30 using namespace llvm::object;
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31
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32 namespace lld {
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33 namespace coff {
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34
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35 using SymbolMapTy =
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36 DenseMap<const SectionChunk *, SmallVector<DefinedRegular *, 4>>;
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37
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38 static constexpr char indent8[] = " "; // 8 spaces
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39 static constexpr char indent16[] = " "; // 16 spaces
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40
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41 // Print out the first three columns of a line.
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42 static void writeHeader(raw_ostream &os, uint64_t addr, uint64_t size,
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43 uint64_t align) {
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44 os << format("%08llx %08llx %5lld ", addr, size, align);
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45 }
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46
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47 // Returns a list of all symbols that we want to print out.
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48 static std::vector<DefinedRegular *> getSymbols() {
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49 std::vector<DefinedRegular *> v;
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50 for (ObjFile *file : ObjFile::instances)
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51 for (Symbol *b : file->getSymbols())
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52 if (auto *sym = dyn_cast_or_null<DefinedRegular>(b))
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53 if (sym && !sym->getCOFFSymbol().isSectionDefinition())
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54 v.push_back(sym);
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55 return v;
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56 }
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57
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58 // Returns a map from sections to their symbols.
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59 static SymbolMapTy getSectionSyms(ArrayRef<DefinedRegular *> syms) {
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60 SymbolMapTy ret;
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61 for (DefinedRegular *s : syms)
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62 ret[s->getChunk()].push_back(s);
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63
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64 // Sort symbols by address.
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65 for (auto &it : ret) {
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66 SmallVectorImpl<DefinedRegular *> &v = it.second;
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67 std::sort(v.begin(), v.end(), [](DefinedRegular *a, DefinedRegular *b) {
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68 return a->getRVA() < b->getRVA();
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69 });
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70 }
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71 return ret;
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72 }
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73
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74 // Construct a map from symbols to their stringified representations.
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75 static DenseMap<DefinedRegular *, std::string>
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76 getSymbolStrings(ArrayRef<DefinedRegular *> syms) {
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77 std::vector<std::string> str(syms.size());
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78 parallelForEachN((size_t)0, syms.size(), [&](size_t i) {
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79 raw_string_ostream os(str[i]);
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80 writeHeader(os, syms[i]->getRVA(), 0, 0);
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81 os << indent16 << toString(*syms[i]);
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82 });
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83
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84 DenseMap<DefinedRegular *, std::string> ret;
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85 for (size_t i = 0, e = syms.size(); i < e; ++i)
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86 ret[syms[i]] = std::move(str[i]);
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87 return ret;
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88 }
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89
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90 void writeMapFile(ArrayRef<OutputSection *> outputSections) {
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91 if (config->mapFile.empty())
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92 return;
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93
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94 std::error_code ec;
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95 raw_fd_ostream os(config->mapFile, ec, sys::fs::OF_None);
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96 if (ec)
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97 fatal("cannot open " + config->mapFile + ": " + ec.message());
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98
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99 // Collect symbol info that we want to print out.
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100 std::vector<DefinedRegular *> syms = getSymbols();
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101 SymbolMapTy sectionSyms = getSectionSyms(syms);
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102 DenseMap<DefinedRegular *, std::string> symStr = getSymbolStrings(syms);
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103
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104 // Print out the header line.
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105 os << "Address Size Align Out In Symbol\n";
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106
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107 // Print out file contents.
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108 for (OutputSection *sec : outputSections) {
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109 writeHeader(os, sec->getRVA(), sec->getVirtualSize(), /*align=*/pageSize);
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110 os << sec->name << '\n';
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111
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112 for (Chunk *c : sec->chunks) {
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113 auto *sc = dyn_cast<SectionChunk>(c);
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114 if (!sc)
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115 continue;
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116
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117 writeHeader(os, sc->getRVA(), sc->getSize(), sc->getAlignment());
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118 os << indent8 << sc->file->getName() << ":(" << sc->getSectionName()
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119 << ")\n";
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120 for (DefinedRegular *sym : sectionSyms[sc])
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121 os << symStr[sym] << '\n';
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122 }
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123 }
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124 }
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125
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126 } // namespace coff
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127 } // namespace lld
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