128 lines · cpp
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-exception6//7//===----------------------------------------------------------------------===//8//9// This file implements the /lldmap option. It shows lists in order and10// hierarchically the output sections, input sections, input files and11// symbol:12//13// Address Size Align Out File Symbol14// 00201000 00000015 4 .text15// 00201000 0000000e 4 test.o:(.text)16// 0020100e 00000000 0 local17// 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 31using namespace llvm;32using namespace llvm::object;33using namespace lld;34using namespace lld::coff;35 36using SymbolMapTy =37 DenseMap<const SectionChunk *, SmallVector<DefinedRegular *, 4>>;38 39static constexpr char indent8[] = " "; // 8 spaces40static constexpr char indent16[] = " "; // 16 spaces41 42// Print out the first three columns of a line.43static 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.49static 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.60static 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 llvm::stable_sort(v, [](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.76static DenseMap<DefinedRegular *, std::string>77getSymbolStrings(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 92void 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