[MemProf] Templatize CallStackRadixTreeBuilder (NFC) (#117014)
[llvm-project.git] / lld / MachO / MapFile.cpp
blob9c0621622ae2f0f60679a13150d85f85a4b35377
1 //===- MapFile.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 -map option, which maps address ranges to their
10 // respective contents, plus the input file these contents were originally from.
11 // The contents (typically symbols) are listed in address order. Dead-stripped
12 // contents are included as well.
14 // # Path: test
15 // # Arch: x86_84
16 // # Object files:
17 // [ 0] linker synthesized
18 // [ 1] a.o
19 // # Sections:
20 // # Address Size Segment Section
21 // 0x1000005C0 0x0000004C __TEXT __text
22 // # Symbols:
23 // # Address Size File Name
24 // 0x1000005C0 0x00000001 [ 1] _main
25 // # Dead Stripped Symbols:
26 // # Size File Name
27 // <<dead>> 0x00000001 [ 1] _foo
29 //===----------------------------------------------------------------------===//
31 #include "MapFile.h"
32 #include "ConcatOutputSection.h"
33 #include "Config.h"
34 #include "InputFiles.h"
35 #include "InputSection.h"
36 #include "OutputSegment.h"
37 #include "Symbols.h"
38 #include "SyntheticSections.h"
39 #include "Target.h"
40 #include "lld/Common/ErrorHandler.h"
41 #include "llvm/ADT/DenseMap.h"
42 #include "llvm/Support/Parallel.h"
43 #include "llvm/Support/TimeProfiler.h"
45 using namespace llvm;
46 using namespace llvm::sys;
47 using namespace lld;
48 using namespace lld::macho;
50 struct CStringInfo {
51 uint32_t fileIndex;
52 StringRef str;
55 struct MapInfo {
56 SmallVector<InputFile *> files;
57 SmallVector<Defined *> deadSymbols;
58 DenseMap<const OutputSection *,
59 SmallVector<std::pair<uint64_t /*addr*/, CStringInfo>>>
60 liveCStringsForSection;
61 SmallVector<CStringInfo> deadCStrings;
64 static MapInfo gatherMapInfo() {
65 MapInfo info;
66 for (InputFile *file : inputFiles) {
67 bool isReferencedFile = false;
69 if (isa<ObjFile>(file) || isa<BitcodeFile>(file)) {
70 uint32_t fileIndex = info.files.size() + 1;
72 // Gather the dead symbols. We don't have to bother with the live ones
73 // because we will pick them up as we iterate over the OutputSections
74 // later.
75 for (Symbol *sym : file->symbols) {
76 if (auto *d = dyn_cast_or_null<Defined>(sym))
77 // Only emit the prevailing definition of a symbol. Also, don't emit
78 // the symbol if it is part of a cstring section (we use the literal
79 // value instead, similar to ld64)
80 if (d->isec() && d->getFile() == file &&
81 !isa<CStringInputSection>(d->isec())) {
82 isReferencedFile = true;
83 if (!d->isLive())
84 info.deadSymbols.push_back(d);
88 // Gather all the cstrings (both live and dead). A CString(Output)Section
89 // doesn't provide us a way of figuring out which InputSections its
90 // cstring contents came from, so we need to build up that mapping here.
91 for (const Section *sec : file->sections) {
92 for (const Subsection &subsec : sec->subsections) {
93 if (auto isec = dyn_cast<CStringInputSection>(subsec.isec)) {
94 auto &liveCStrings = info.liveCStringsForSection[isec->parent];
95 for (const auto &[i, piece] : llvm::enumerate(isec->pieces)) {
96 if (piece.live)
97 liveCStrings.push_back({isec->parent->addr + piece.outSecOff,
98 {fileIndex, isec->getStringRef(i)}});
99 else
100 info.deadCStrings.push_back({fileIndex, isec->getStringRef(i)});
101 isReferencedFile = true;
103 } else {
104 break;
108 } else if (const auto *dylibFile = dyn_cast<DylibFile>(file)) {
109 isReferencedFile = dylibFile->isReferenced();
112 if (isReferencedFile)
113 info.files.push_back(file);
116 // cstrings are not stored in sorted order in their OutputSections, so we sort
117 // them here.
118 for (auto &liveCStrings : info.liveCStringsForSection)
119 parallelSort(liveCStrings.second, [](const auto &p1, const auto &p2) {
120 return p1.first < p2.first;
122 return info;
125 // We use this instead of `toString(const InputFile *)` as we don't want to
126 // include the dylib install name in our output.
127 static void printFileName(raw_fd_ostream &os, const InputFile *f) {
128 if (f->archiveName.empty())
129 os << f->getName();
130 else
131 os << f->archiveName << "(" << path::filename(f->getName()) + ")";
134 // For printing the contents of the __stubs and __la_symbol_ptr sections.
135 static void printStubsEntries(
136 raw_fd_ostream &os,
137 const DenseMap<lld::macho::InputFile *, uint32_t> &readerToFileOrdinal,
138 const OutputSection *osec, size_t entrySize) {
139 for (const Symbol *sym : in.stubs->getEntries())
140 os << format("0x%08llX\t0x%08zX\t[%3u] %s\n",
141 osec->addr + sym->stubsIndex * entrySize, entrySize,
142 readerToFileOrdinal.lookup(sym->getFile()),
143 sym->getName().str().data());
146 static void printNonLazyPointerSection(raw_fd_ostream &os,
147 NonLazyPointerSectionBase *osec) {
148 // ld64 considers stubs to belong to particular files, but considers GOT
149 // entries to be linker-synthesized. Not sure why they made that decision, but
150 // I think we can follow suit unless there's demand for better symbol-to-file
151 // associations.
152 for (const Symbol *sym : osec->getEntries())
153 os << format("0x%08llX\t0x%08zX\t[ 0] non-lazy-pointer-to-local: %s\n",
154 osec->addr + sym->gotIndex * target->wordSize,
155 target->wordSize, sym->getName().str().data());
158 static uint64_t getSymSizeForMap(Defined *sym) {
159 if (sym->identicalCodeFoldingKind == Symbol::ICFFoldKind::Body)
160 return 0;
161 return sym->size;
164 void macho::writeMapFile() {
165 if (config->mapFile.empty())
166 return;
168 TimeTraceScope timeScope("Write map file");
170 // Open a map file for writing.
171 std::error_code ec;
172 raw_fd_ostream os(config->mapFile, ec, sys::fs::OF_None);
173 if (ec) {
174 error("cannot open " + config->mapFile + ": " + ec.message());
175 return;
178 os << format("# Path: %s\n", config->outputFile.str().c_str());
179 os << format("# Arch: %s\n",
180 getArchitectureName(config->arch()).str().c_str());
182 MapInfo info = gatherMapInfo();
184 os << "# Object files:\n";
185 os << format("[%3u] %s\n", 0, (const char *)"linker synthesized");
186 uint32_t fileIndex = 1;
187 DenseMap<lld::macho::InputFile *, uint32_t> readerToFileOrdinal;
188 for (InputFile *file : info.files) {
189 os << format("[%3u] ", fileIndex);
190 printFileName(os, file);
191 os << "\n";
192 readerToFileOrdinal[file] = fileIndex++;
195 os << "# Sections:\n";
196 os << "# Address\tSize \tSegment\tSection\n";
197 for (OutputSegment *seg : outputSegments)
198 for (OutputSection *osec : seg->getSections()) {
199 if (osec->isHidden())
200 continue;
202 os << format("0x%08llX\t0x%08llX\t%s\t%s\n", osec->addr, osec->getSize(),
203 seg->name.str().c_str(), osec->name.str().c_str());
206 // Shared function to print an array of symbols.
207 auto printIsecArrSyms = [&](const std::vector<ConcatInputSection *> &arr) {
208 for (const ConcatInputSection *isec : arr) {
209 for (Defined *sym : isec->symbols) {
210 if (!(isPrivateLabel(sym->getName()) && getSymSizeForMap(sym) == 0))
211 os << format("0x%08llX\t0x%08llX\t[%3u] %s\n", sym->getVA(),
212 getSymSizeForMap(sym),
213 readerToFileOrdinal[sym->getFile()],
214 sym->getName().str().data());
219 os << "# Symbols:\n";
220 os << "# Address\tSize \tFile Name\n";
221 for (const OutputSegment *seg : outputSegments) {
222 for (const OutputSection *osec : seg->getSections()) {
223 if (auto *concatOsec = dyn_cast<ConcatOutputSection>(osec)) {
224 printIsecArrSyms(concatOsec->inputs);
225 } else if (osec == in.cStringSection || osec == in.objcMethnameSection) {
226 const auto &liveCStrings = info.liveCStringsForSection.lookup(osec);
227 uint64_t lastAddr = 0; // strings will never start at address 0, so this
228 // is a sentinel value
229 for (const auto &[addr, info] : liveCStrings) {
230 uint64_t size = 0;
231 if (addr != lastAddr)
232 size = info.str.size() + 1; // include null terminator
233 lastAddr = addr;
234 os << format("0x%08llX\t0x%08llX\t[%3u] literal string: ", addr, size,
235 info.fileIndex);
236 os.write_escaped(info.str) << "\n";
238 } else if (osec == (void *)in.unwindInfo) {
239 os << format("0x%08llX\t0x%08llX\t[ 0] compact unwind info\n",
240 osec->addr, osec->getSize());
241 } else if (osec == in.stubs) {
242 printStubsEntries(os, readerToFileOrdinal, osec, target->stubSize);
243 } else if (osec == in.lazyPointers) {
244 printStubsEntries(os, readerToFileOrdinal, osec, target->wordSize);
245 } else if (osec == in.stubHelper) {
246 // yes, ld64 calls it "helper helper"...
247 os << format("0x%08llX\t0x%08llX\t[ 0] helper helper\n", osec->addr,
248 osec->getSize());
249 } else if (osec == in.got) {
250 printNonLazyPointerSection(os, in.got);
251 } else if (osec == in.tlvPointers) {
252 printNonLazyPointerSection(os, in.tlvPointers);
253 } else if (osec == in.objcMethList) {
254 printIsecArrSyms(in.objcMethList->getInputs());
256 // TODO print other synthetic sections
260 if (config->deadStrip) {
261 os << "# Dead Stripped Symbols:\n";
262 os << "# \tSize \tFile Name\n";
263 for (Defined *sym : info.deadSymbols) {
264 assert(!sym->isLive());
265 os << format("<<dead>>\t0x%08llX\t[%3u] %s\n", getSymSizeForMap(sym),
266 readerToFileOrdinal[sym->getFile()],
267 sym->getName().str().data());
269 for (CStringInfo &cstrInfo : info.deadCStrings) {
270 os << format("<<dead>>\t0x%08zX\t[%3u] literal string: ",
271 cstrInfo.str.size() + 1, cstrInfo.fileIndex);
272 os.write_escaped(cstrInfo.str) << "\n";