1 //===- LLDMapFile.cpp -----------------------------------------------------===// 2 // 3 // Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions. 4 // See https://llvm.org/LICENSE.txt for license information. 5 // SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception 6 // 7 //===----------------------------------------------------------------------===// 8 // 9 // This file implements the /lldmap option. It shows lists in order and 10 // hierarchically the output sections, input sections, input files and 11 // symbol: 12 // 13 // Address Size Align Out File Symbol 14 // 00201000 00000015 4 .text 15 // 00201000 0000000e 4 test.o:(.text) 16 // 0020100e 00000000 0 local 17 // 00201005 00000000 0 f(int) 18 // 19 //===----------------------------------------------------------------------===// 20 21 #include "LLDMapFile.h" 22 #include "COFFLinkerContext.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/TimeProfiler.h" 29 #include "llvm/Support/raw_ostream.h" 30 31 using namespace llvm; 32 using namespace llvm::object; 33 using namespace lld; 34 using namespace lld::coff; 35 36 using SymbolMapTy = 37 DenseMap<const SectionChunk *, SmallVector<DefinedRegular *, 4>>; 38 39 static constexpr char indent8[] = " "; // 8 spaces 40 static constexpr char 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(const COFFLinkerContext &ctx) { 50 std::vector<DefinedRegular *> v; 51 for (ObjFile *file : ctx.objFileInstances) 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::stable_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(const COFFLinkerContext &ctx, 78 ArrayRef<DefinedRegular *> syms) { 79 std::vector<std::string> str(syms.size()); 80 parallelFor((size_t)0, syms.size(), [&](size_t i) { 81 raw_string_ostream os(str[i]); 82 writeHeader(os, syms[i]->getRVA(), 0, 0); 83 os << indent16 << toString(ctx, *syms[i]); 84 }); 85 86 DenseMap<DefinedRegular *, std::string> ret; 87 for (size_t i = 0, e = syms.size(); i < e; ++i) 88 ret[syms[i]] = std::move(str[i]); 89 return ret; 90 } 91 92 void lld::coff::writeLLDMapFile(const COFFLinkerContext &ctx) { 93 if (ctx.config.lldmapFile.empty()) 94 return; 95 96 llvm::TimeTraceScope timeScope(".lldmap file"); 97 std::error_code ec; 98 raw_fd_ostream os(ctx.config.lldmapFile, ec, sys::fs::OF_None); 99 if (ec) 100 fatal("cannot open " + ctx.config.lldmapFile + ": " + ec.message()); 101 102 // Collect symbol info that we want to print out. 103 std::vector<DefinedRegular *> syms = getSymbols(ctx); 104 SymbolMapTy sectionSyms = getSectionSyms(syms); 105 DenseMap<DefinedRegular *, std::string> symStr = getSymbolStrings(ctx, syms); 106 107 // Print out the header line. 108 os << "Address Size Align Out In Symbol\n"; 109 110 // Print out file contents. 111 for (OutputSection *sec : ctx.outputSections) { 112 writeHeader(os, sec->getRVA(), sec->getVirtualSize(), /*align=*/pageSize); 113 os << sec->name << '\n'; 114 115 for (Chunk *c : sec->chunks) { 116 auto *sc = dyn_cast<SectionChunk>(c); 117 if (!sc) 118 continue; 119 120 writeHeader(os, sc->getRVA(), sc->getSize(), sc->getAlignment()); 121 os << indent8 << sc->file->getName() << ":(" << sc->getSectionName() 122 << ")\n"; 123 for (DefinedRegular *sym : sectionSyms[sc]) 124 os << symStr[sym] << '\n'; 125 } 126 } 127 } 128