1 //===- MapFile.cpp --------------------------------------------------------===// 2 // 3 // The LLVM Linker 4 // 5 // This file is distributed under the University of Illinois Open Source 6 // License. See LICENSE.TXT for details. 7 // 8 //===----------------------------------------------------------------------===// 9 // 10 // This file implements the /lldmap option. It shows lists in order and 11 // hierarchically the output sections, input sections, input files and 12 // symbol: 13 // 14 // Address Size Align Out File Symbol 15 // 00201000 00000015 4 .text 16 // 00201000 0000000e 4 test.o:(.text) 17 // 0020100e 00000000 0 local 18 // 00201005 00000000 0 f(int) 19 // 20 //===----------------------------------------------------------------------===// 21 22 #include "MapFile.h" 23 #include "SymbolTable.h" 24 #include "Symbols.h" 25 #include "Writer.h" 26 #include "lld/Common/ErrorHandler.h" 27 #include "llvm/Support/Parallel.h" 28 #include "llvm/Support/raw_ostream.h" 29 30 using namespace llvm; 31 using namespace llvm::object; 32 33 using namespace lld; 34 using namespace lld::coff; 35 36 typedef DenseMap<const SectionChunk *, SmallVector<DefinedRegular *, 4>> 37 SymbolMapTy; 38 39 static const std::string Indent8 = " "; // 8 spaces 40 static const std::string Indent16 = " "; // 16 spaces 41 42 // Print out the first three columns of a line. 43 static void writeHeader(raw_ostream &OS, uint64_t Addr, uint64_t Size, 44 uint64_t Align) { 45 OS << format("%08llx %08llx %5lld ", Addr, Size, Align); 46 } 47 48 // Returns a list of all symbols that we want to print out. 49 static std::vector<DefinedRegular *> getSymbols() { 50 std::vector<DefinedRegular *> V; 51 for (ObjFile *File : ObjFile::Instances) 52 for (Symbol *B : File->getSymbols()) 53 if (auto *Sym = dyn_cast_or_null<DefinedRegular>(B)) 54 if (Sym && !Sym->getCOFFSymbol().isSectionDefinition()) 55 V.push_back(Sym); 56 return V; 57 } 58 59 // Returns a map from sections to their symbols. 60 static SymbolMapTy getSectionSyms(ArrayRef<DefinedRegular *> Syms) { 61 SymbolMapTy Ret; 62 for (DefinedRegular *S : Syms) 63 Ret[S->getChunk()].push_back(S); 64 65 // Sort symbols by address. 66 for (auto &It : Ret) { 67 SmallVectorImpl<DefinedRegular *> &V = It.second; 68 std::sort(V.begin(), V.end(), [](DefinedRegular *A, DefinedRegular *B) { 69 return A->getRVA() < B->getRVA(); 70 }); 71 } 72 return Ret; 73 } 74 75 // Construct a map from symbols to their stringified representations. 76 static DenseMap<DefinedRegular *, std::string> 77 getSymbolStrings(ArrayRef<DefinedRegular *> Syms) { 78 std::vector<std::string> Str(Syms.size()); 79 for_each_n(parallel::par, (size_t)0, Syms.size(), [&](size_t I) { 80 raw_string_ostream OS(Str[I]); 81 writeHeader(OS, Syms[I]->getRVA(), 0, 0); 82 OS << Indent16 << toString(*Syms[I]); 83 }); 84 85 DenseMap<DefinedRegular *, std::string> Ret; 86 for (size_t I = 0, E = Syms.size(); I < E; ++I) 87 Ret[Syms[I]] = std::move(Str[I]); 88 return Ret; 89 } 90 91 void coff::writeMapFile(ArrayRef<OutputSection *> OutputSections) { 92 if (Config->MapFile.empty()) 93 return; 94 95 std::error_code EC; 96 raw_fd_ostream OS(Config->MapFile, EC, sys::fs::F_None); 97 if (EC) 98 fatal("cannot open " + Config->MapFile + ": " + EC.message()); 99 100 // Collect symbol info that we want to print out. 101 std::vector<DefinedRegular *> Syms = getSymbols(); 102 SymbolMapTy SectionSyms = getSectionSyms(Syms); 103 DenseMap<DefinedRegular *, std::string> SymStr = getSymbolStrings(Syms); 104 105 // Print out the header line. 106 OS << "Address Size Align Out In Symbol\n"; 107 108 // Print out file contents. 109 for (OutputSection *Sec : OutputSections) { 110 writeHeader(OS, Sec->getRVA(), Sec->getVirtualSize(), /*Align=*/PageSize); 111 OS << Sec->Name << '\n'; 112 113 for (Chunk *C : Sec->getChunks()) { 114 auto *SC = dyn_cast<SectionChunk>(C); 115 if (!SC) 116 continue; 117 118 writeHeader(OS, SC->getRVA(), SC->getSize(), SC->Alignment); 119 OS << Indent8 << SC->File->getName() << ":(" << SC->getSectionName() 120 << ")\n"; 121 for (DefinedRegular *Sym : SectionSyms[SC]) 122 OS << SymStr[Sym] << '\n'; 123 } 124 } 125 } 126