1 //===-- llvm-tli-checker.cpp - Compare TargetLibraryInfo to SDK libraries -===//
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 #include "llvm/ADT/SmallString.h"
10 #include "llvm/ADT/StringMap.h"
11 #include "llvm/Analysis/TargetLibraryInfo.h"
12 #include "llvm/Config/llvm-config.h"
13 #include "llvm/Demangle/Demangle.h"
14 #include "llvm/Object/Archive.h"
15 #include "llvm/Object/ELFObjectFile.h"
16 #include "llvm/Option/ArgList.h"
17 #include "llvm/Option/Option.h"
18 #include "llvm/Support/FileSystem.h"
19 #include "llvm/Support/InitLLVM.h"
20 #include "llvm/Support/Path.h"
21 #include "llvm/Support/WithColor.h"
22 #include "llvm/TargetParser/Triple.h"
23
24 using namespace llvm;
25 using namespace llvm::object;
26
27 // Command-line option boilerplate.
28 namespace {
29 enum ID {
30 OPT_INVALID = 0, // This is not an option ID.
31 #define OPTION(...) LLVM_MAKE_OPT_ID(__VA_ARGS__),
32 #include "Opts.inc"
33 #undef OPTION
34 };
35
36 #define PREFIX(NAME, VALUE) \
37 static constexpr StringLiteral NAME##_init[] = VALUE; \
38 static constexpr ArrayRef<StringLiteral> NAME(NAME##_init, \
39 std::size(NAME##_init) - 1);
40 #include "Opts.inc"
41 #undef PREFIX
42
43 using namespace llvm::opt;
44 static constexpr opt::OptTable::Info InfoTable[] = {
45 #define OPTION(...) LLVM_CONSTRUCT_OPT_INFO(__VA_ARGS__),
46 #include "Opts.inc"
47 #undef OPTION
48 };
49
50 class TLICheckerOptTable : public opt::GenericOptTable {
51 public:
TLICheckerOptTable()52 TLICheckerOptTable() : GenericOptTable(InfoTable) {}
53 };
54 } // end anonymous namespace
55
56 // We have three levels of reporting.
57 enum class ReportKind {
58 Error, // For argument parsing errors.
59 Summary, // Report counts but not details.
60 Discrepancy, // Report where TLI and the library differ.
61 Full // Report for every known-to-TLI function.
62 };
63
64 // Most of the ObjectFile interfaces return an Expected<T>, so make it easy
65 // to ignore errors.
66 template <typename T>
unwrapIgnoreError(Expected<T> E,T Default=T ())67 static T unwrapIgnoreError(Expected<T> E, T Default = T()) {
68 if (E)
69 return std::move(*E);
70 // Sink the error and return a nothing value.
71 consumeError(E.takeError());
72 return Default;
73 }
74
fail(const Twine & Message)75 static void fail(const Twine &Message) {
76 WithColor::error() << Message << '\n';
77 exit(EXIT_FAILURE);
78 }
79
80 // Some problem occurred with an archive member; complain and continue.
reportArchiveChildIssue(const object::Archive::Child & C,int Index,StringRef ArchiveFilename)81 static void reportArchiveChildIssue(const object::Archive::Child &C, int Index,
82 StringRef ArchiveFilename) {
83 // First get the member name.
84 std::string ChildName;
85 Expected<StringRef> NameOrErr = C.getName();
86 if (NameOrErr)
87 ChildName = std::string(NameOrErr.get());
88 else {
89 // Ignore the name-fetch error, just report the index.
90 consumeError(NameOrErr.takeError());
91 ChildName = "<file index: " + std::to_string(Index) + ">";
92 }
93
94 WithColor::warning() << ArchiveFilename << "(" << ChildName
95 << "): member is not usable\n";
96 }
97
98 // Return Name, and if Name is mangled, append "aka" and the demangled name.
getPrintableName(StringRef Name)99 static std::string getPrintableName(StringRef Name) {
100 std::string OutputName = "'";
101 OutputName += Name;
102 OutputName += "'";
103 std::string DemangledName(demangle(Name));
104 if (Name != DemangledName) {
105 OutputName += " aka ";
106 OutputName += DemangledName;
107 }
108 return OutputName;
109 }
110
111 // Store all the names that TargetLibraryInfo knows about; the bool indicates
112 // whether TLI has it marked as "available" for the target of interest.
113 // This is a vector to preserve the sorted order for better reporting.
114 struct TLINameList : std::vector<std::pair<StringRef, bool>> {
115 // Record all the TLI info in the vector.
116 void initialize(StringRef TargetTriple);
117 // Print out what we found.
118 void dump();
119 };
120 static TLINameList TLINames;
121
initialize(StringRef TargetTriple)122 void TLINameList::initialize(StringRef TargetTriple) {
123 Triple T(TargetTriple);
124 TargetLibraryInfoImpl TLII(T);
125 TargetLibraryInfo TLI(TLII);
126
127 reserve(LibFunc::NumLibFuncs);
128 size_t NumAvailable = 0;
129 for (unsigned FI = 0; FI != LibFunc::NumLibFuncs; ++FI) {
130 LibFunc LF = (LibFunc)FI;
131 bool Available = TLI.has(LF);
132 // getName returns names only for available funcs.
133 TLII.setAvailable(LF);
134 emplace_back(TLI.getName(LF), Available);
135 if (Available)
136 ++NumAvailable;
137 }
138 outs() << "TLI knows " << LibFunc::NumLibFuncs << " symbols, " << NumAvailable
139 << " available for '" << TargetTriple << "'\n";
140 }
141
dump()142 void TLINameList::dump() {
143 // Assume this gets called after initialize(), so we have the above line of
144 // output as a header. So, for example, no need to repeat the triple.
145 for (auto &TLIName : TLINames) {
146 outs() << (TLIName.second ? " " : "not ")
147 << "available: " << getPrintableName(TLIName.first) << '\n';
148 }
149 }
150
151 // Store all the exported symbol names we found in the input libraries.
152 // We use a map to get hashed lookup speed; the bool is meaningless.
153 class SDKNameMap : public StringMap<bool> {
154 void maybeInsertSymbol(const SymbolRef &S, const ObjectFile &O);
155 void populateFromObject(ObjectFile *O);
156 void populateFromArchive(Archive *A);
157
158 public:
159 void populateFromFile(StringRef LibDir, StringRef LibName);
160 };
161 static SDKNameMap SDKNames;
162
163 // Insert defined global function symbols into the map if valid.
maybeInsertSymbol(const SymbolRef & S,const ObjectFile & O)164 void SDKNameMap::maybeInsertSymbol(const SymbolRef &S, const ObjectFile &O) {
165 SymbolRef::Type Type = unwrapIgnoreError(S.getType());
166 uint32_t Flags = unwrapIgnoreError(S.getFlags());
167 section_iterator Section = unwrapIgnoreError(S.getSection(),
168 /*Default=*/O.section_end());
169 if (Type == SymbolRef::ST_Function && (Flags & SymbolRef::SF_Global) &&
170 Section != O.section_end()) {
171 StringRef Name = unwrapIgnoreError(S.getName());
172 insert({ Name, true });
173 }
174 }
175
176 // Given an ObjectFile, extract the global function symbols.
populateFromObject(ObjectFile * O)177 void SDKNameMap::populateFromObject(ObjectFile *O) {
178 // FIXME: Support other formats.
179 if (!O->isELF()) {
180 WithColor::warning() << O->getFileName()
181 << ": only ELF-format files are supported\n";
182 return;
183 }
184 const auto *ELF = cast<ELFObjectFileBase>(O);
185
186 if (ELF->getEType() == ELF::ET_REL) {
187 for (const auto &S : ELF->symbols())
188 maybeInsertSymbol(S, *O);
189 } else {
190 for (const auto &S : ELF->getDynamicSymbolIterators())
191 maybeInsertSymbol(S, *O);
192 }
193 }
194
195 // Unpack an archive and populate from the component object files.
196 // This roughly imitates dumpArchive() from llvm-objdump.cpp.
populateFromArchive(Archive * A)197 void SDKNameMap::populateFromArchive(Archive *A) {
198 Error Err = Error::success();
199 int Index = -1;
200 for (const auto &C : A->children(Err)) {
201 ++Index;
202 Expected<std::unique_ptr<object::Binary>> ChildOrErr = C.getAsBinary();
203 if (!ChildOrErr) {
204 if (auto E = isNotObjectErrorInvalidFileType(ChildOrErr.takeError())) {
205 // Issue a generic warning.
206 consumeError(std::move(E));
207 reportArchiveChildIssue(C, Index, A->getFileName());
208 }
209 continue;
210 }
211 if (ObjectFile *O = dyn_cast<ObjectFile>(&*ChildOrErr.get()))
212 populateFromObject(O);
213 // Ignore non-object archive members.
214 }
215 if (Err)
216 WithColor::defaultErrorHandler(std::move(Err));
217 }
218
219 // Unpack a library file and extract the global function names.
populateFromFile(StringRef LibDir,StringRef LibName)220 void SDKNameMap::populateFromFile(StringRef LibDir, StringRef LibName) {
221 // Pick an arbitrary but reasonable default size.
222 SmallString<255> Filepath(LibDir);
223 sys::path::append(Filepath, LibName);
224 if (!sys::fs::exists(Filepath)) {
225 WithColor::warning() << StringRef(Filepath) << ": not found\n";
226 return;
227 }
228 outs() << "\nLooking for symbols in '" << StringRef(Filepath) << "'\n";
229 auto ExpectedBinary = createBinary(Filepath);
230 if (!ExpectedBinary) {
231 // FIXME: Report this better.
232 WithColor::defaultWarningHandler(ExpectedBinary.takeError());
233 return;
234 }
235 OwningBinary<Binary> OBinary = std::move(*ExpectedBinary);
236 Binary &Binary = *OBinary.getBinary();
237 size_t Precount = size();
238 if (Archive *A = dyn_cast<Archive>(&Binary))
239 populateFromArchive(A);
240 else if (ObjectFile *O = dyn_cast<ObjectFile>(&Binary))
241 populateFromObject(O);
242 else {
243 WithColor::warning() << StringRef(Filepath)
244 << ": not an archive or object file\n";
245 return;
246 }
247 if (Precount == size())
248 WithColor::warning() << StringRef(Filepath) << ": no symbols found\n";
249 else
250 outs() << "Found " << size() - Precount << " global function symbols in '"
251 << StringRef(Filepath) << "'\n";
252 }
253
main(int argc,char * argv[])254 int main(int argc, char *argv[]) {
255 InitLLVM X(argc, argv);
256 BumpPtrAllocator A;
257 StringSaver Saver(A);
258 TLICheckerOptTable Tbl;
259 opt::InputArgList Args = Tbl.parseArgs(argc, argv, OPT_UNKNOWN, Saver,
260 [&](StringRef Msg) { fail(Msg); });
261
262 if (Args.hasArg(OPT_help)) {
263 std::string Usage(argv[0]);
264 Usage += " [options] library-file [library-file...]";
265 Tbl.printHelp(outs(), Usage.c_str(),
266 "LLVM TargetLibraryInfo versus SDK checker");
267 outs() << "\nPass @FILE as argument to read options or library names from "
268 "FILE.\n";
269 return 0;
270 }
271
272 TLINames.initialize(Args.getLastArgValue(OPT_triple_EQ));
273
274 // --dump-tli doesn't require any input files.
275 if (Args.hasArg(OPT_dump_tli)) {
276 TLINames.dump();
277 return 0;
278 }
279
280 std::vector<std::string> LibList = Args.getAllArgValues(OPT_INPUT);
281 if (LibList.empty())
282 fail("no input files\n");
283 StringRef LibDir = Args.getLastArgValue(OPT_libdir_EQ);
284 bool SeparateMode = Args.hasArg(OPT_separate);
285
286 ReportKind ReportLevel =
287 SeparateMode ? ReportKind::Summary : ReportKind::Discrepancy;
288 if (const opt::Arg *A = Args.getLastArg(OPT_report_EQ)) {
289 ReportLevel = StringSwitch<ReportKind>(A->getValue())
290 .Case("summary", ReportKind::Summary)
291 .Case("discrepancy", ReportKind::Discrepancy)
292 .Case("full", ReportKind::Full)
293 .Default(ReportKind::Error);
294 if (ReportLevel == ReportKind::Error)
295 fail(Twine("invalid option for --report: ", StringRef(A->getValue())));
296 }
297
298 for (size_t I = 0; I < LibList.size(); ++I) {
299 // In SeparateMode we report on input libraries individually; otherwise
300 // we do one big combined search. Reading to the end of LibList here
301 // will cause the outer while loop to terminate cleanly.
302 if (SeparateMode) {
303 SDKNames.clear();
304 SDKNames.populateFromFile(LibDir, LibList[I]);
305 if (SDKNames.empty())
306 continue;
307 } else {
308 do
309 SDKNames.populateFromFile(LibDir, LibList[I]);
310 while (++I < LibList.size());
311 if (SDKNames.empty()) {
312 WithColor::error() << "NO symbols found!\n";
313 break;
314 }
315 outs() << "Found a grand total of " << SDKNames.size()
316 << " library symbols\n";
317 }
318 unsigned TLIdoesSDKdoesnt = 0;
319 unsigned TLIdoesntSDKdoes = 0;
320 unsigned TLIandSDKboth = 0;
321 unsigned TLIandSDKneither = 0;
322 for (auto &TLIName : TLINames) {
323 bool TLIHas = TLIName.second;
324 bool SDKHas = SDKNames.count(TLIName.first) == 1;
325 int Which = int(TLIHas) * 2 + int(SDKHas);
326 switch (Which) {
327 case 0: ++TLIandSDKneither; break;
328 case 1: ++TLIdoesntSDKdoes; break;
329 case 2: ++TLIdoesSDKdoesnt; break;
330 case 3: ++TLIandSDKboth; break;
331 }
332 // If the results match, report only if user requested a full report.
333 ReportKind Threshold =
334 TLIHas == SDKHas ? ReportKind::Full : ReportKind::Discrepancy;
335 if (Threshold <= ReportLevel) {
336 constexpr char YesNo[2][4] = {"no ", "yes"};
337 constexpr char Indicator[4][3] = {"!!", ">>", "<<", "=="};
338 outs() << Indicator[Which] << " TLI " << YesNo[TLIHas] << " SDK "
339 << YesNo[SDKHas] << ": " << getPrintableName(TLIName.first)
340 << '\n';
341 }
342 }
343
344 assert(TLIandSDKboth + TLIandSDKneither + TLIdoesSDKdoesnt +
345 TLIdoesntSDKdoes ==
346 LibFunc::NumLibFuncs);
347 (void) TLIandSDKneither;
348 outs() << "<< Total TLI yes SDK no: " << TLIdoesSDKdoesnt
349 << "\n>> Total TLI no SDK yes: " << TLIdoesntSDKdoes
350 << "\n== Total TLI yes SDK yes: " << TLIandSDKboth;
351 if (TLIandSDKboth == 0) {
352 outs() << " *** NO TLI SYMBOLS FOUND";
353 if (SeparateMode)
354 outs() << " in '" << LibList[I] << "'";
355 }
356 outs() << '\n';
357
358 if (!SeparateMode) {
359 if (TLIdoesSDKdoesnt == 0 && TLIdoesntSDKdoes == 0)
360 outs() << "PASS: LLVM TLI matched SDK libraries successfully.\n";
361 else
362 outs() << "FAIL: LLVM TLI doesn't match SDK libraries.\n";
363 }
364 }
365 }
366