1 //===---- ExecutionUtils.cpp - Utilities for executing functions in Orc ---===//
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
7 //===----------------------------------------------------------------------===//
9 #include "llvm/ExecutionEngine/Orc/ExecutionUtils.h"
11 #include "llvm/ExecutionEngine/Orc/Layer.h"
12 #include "llvm/IR/Constants.h"
13 #include "llvm/IR/Function.h"
14 #include "llvm/IR/GlobalVariable.h"
15 #include "llvm/IR/Module.h"
16 #include "llvm/Object/MachOUniversal.h"
17 #include "llvm/Support/FormatVariadic.h"
18 #include "llvm/Support/TargetRegistry.h"
19 #include "llvm/Target/TargetMachine.h"
24 int runAsMain(int (*Main)(int, char *[]), ArrayRef<std::string> Args,
25 Optional<StringRef> ProgramName) {
26 std::vector<std::unique_ptr<char[]>> ArgVStorage;
27 std::vector<char *> ArgV;
29 ArgVStorage.reserve(Args.size() + (ProgramName ? 1 : 0));
30 ArgV.reserve(Args.size() + 1 + (ProgramName ? 1 : 0));
33 ArgVStorage.push_back(std::make_unique<char[]>(ProgramName->size() + 1));
34 llvm::copy(*ProgramName, &ArgVStorage.back()[0]);
35 ArgVStorage.back()[ProgramName->size()] = '\0';
36 ArgV.push_back(ArgVStorage.back().get());
39 for (auto &Arg : Args) {
40 ArgVStorage.push_back(std::make_unique<char[]>(Arg.size() + 1));
41 llvm::copy(Arg, &ArgVStorage.back()[0]);
42 ArgVStorage.back()[Arg.size()] = '\0';
43 ArgV.push_back(ArgVStorage.back().get());
45 ArgV.push_back(nullptr);
47 return Main(Args.size() + !!ProgramName, ArgV.data());
50 CtorDtorIterator::CtorDtorIterator(const GlobalVariable *GV, bool End)
52 GV ? dyn_cast_or_null<ConstantArray>(GV->getInitializer()) : nullptr),
53 I((InitList && End) ? InitList->getNumOperands() : 0) {
56 bool CtorDtorIterator::operator==(const CtorDtorIterator &Other) const {
57 assert(InitList == Other.InitList && "Incomparable iterators.");
61 bool CtorDtorIterator::operator!=(const CtorDtorIterator &Other) const {
62 return !(*this == Other);
65 CtorDtorIterator& CtorDtorIterator::operator++() {
70 CtorDtorIterator CtorDtorIterator::operator++(int) {
71 CtorDtorIterator Temp = *this;
76 CtorDtorIterator::Element CtorDtorIterator::operator*() const {
77 ConstantStruct *CS = dyn_cast<ConstantStruct>(InitList->getOperand(I));
78 assert(CS && "Unrecognized type in llvm.global_ctors/llvm.global_dtors");
80 Constant *FuncC = CS->getOperand(1);
81 Function *Func = nullptr;
83 // Extract function pointer, pulling off any casts.
85 if (Function *F = dyn_cast_or_null<Function>(FuncC)) {
88 } else if (ConstantExpr *CE = dyn_cast_or_null<ConstantExpr>(FuncC)) {
90 FuncC = dyn_cast_or_null<ConstantExpr>(CE->getOperand(0));
94 // This isn't anything we recognize. Bail out with Func left set to null.
99 auto *Priority = cast<ConstantInt>(CS->getOperand(0));
100 Value *Data = CS->getNumOperands() == 3 ? CS->getOperand(2) : nullptr;
101 if (Data && !isa<GlobalValue>(Data))
103 return Element(Priority->getZExtValue(), Func, Data);
106 iterator_range<CtorDtorIterator> getConstructors(const Module &M) {
107 const GlobalVariable *CtorsList = M.getNamedGlobal("llvm.global_ctors");
108 return make_range(CtorDtorIterator(CtorsList, false),
109 CtorDtorIterator(CtorsList, true));
112 iterator_range<CtorDtorIterator> getDestructors(const Module &M) {
113 const GlobalVariable *DtorsList = M.getNamedGlobal("llvm.global_dtors");
114 return make_range(CtorDtorIterator(DtorsList, false),
115 CtorDtorIterator(DtorsList, true));
118 bool StaticInitGVIterator::isStaticInitGlobal(GlobalValue &GV) {
119 if (GV.isDeclaration())
122 if (GV.hasName() && (GV.getName() == "llvm.global_ctors" ||
123 GV.getName() == "llvm.global_dtors"))
126 if (ObjFmt == Triple::MachO) {
127 // FIXME: These section checks are too strict: We should match first and
128 // second word split by comma.
129 if (GV.hasSection() &&
130 (GV.getSection().startswith("__DATA,__objc_classlist") ||
131 GV.getSection().startswith("__DATA,__objc_selrefs")))
138 void CtorDtorRunner::add(iterator_range<CtorDtorIterator> CtorDtors) {
139 if (CtorDtors.empty())
142 MangleAndInterner Mangle(
143 JD.getExecutionSession(),
144 (*CtorDtors.begin()).Func->getParent()->getDataLayout());
146 for (auto CtorDtor : CtorDtors) {
147 assert(CtorDtor.Func && CtorDtor.Func->hasName() &&
148 "Ctor/Dtor function must be named to be runnable under the JIT");
150 // FIXME: Maybe use a symbol promoter here instead.
151 if (CtorDtor.Func->hasLocalLinkage()) {
152 CtorDtor.Func->setLinkage(GlobalValue::ExternalLinkage);
153 CtorDtor.Func->setVisibility(GlobalValue::HiddenVisibility);
156 if (CtorDtor.Data && cast<GlobalValue>(CtorDtor.Data)->isDeclaration()) {
157 dbgs() << " Skipping because why now?\n";
161 CtorDtorsByPriority[CtorDtor.Priority].push_back(
162 Mangle(CtorDtor.Func->getName()));
166 Error CtorDtorRunner::run() {
167 using CtorDtorTy = void (*)();
169 SymbolLookupSet LookupSet;
170 for (auto &KV : CtorDtorsByPriority)
171 for (auto &Name : KV.second)
173 assert(!LookupSet.containsDuplicates() &&
174 "Ctor/Dtor list contains duplicates");
176 auto &ES = JD.getExecutionSession();
177 if (auto CtorDtorMap = ES.lookup(
178 makeJITDylibSearchOrder(&JD, JITDylibLookupFlags::MatchAllSymbols),
179 std::move(LookupSet))) {
180 for (auto &KV : CtorDtorsByPriority) {
181 for (auto &Name : KV.second) {
182 assert(CtorDtorMap->count(Name) && "No entry for Name");
183 auto CtorDtor = reinterpret_cast<CtorDtorTy>(
184 static_cast<uintptr_t>((*CtorDtorMap)[Name].getAddress()));
188 CtorDtorsByPriority.clear();
189 return Error::success();
191 return CtorDtorMap.takeError();
194 void LocalCXXRuntimeOverridesBase::runDestructors() {
195 auto& CXXDestructorDataPairs = DSOHandleOverride;
196 for (auto &P : CXXDestructorDataPairs)
198 CXXDestructorDataPairs.clear();
201 int LocalCXXRuntimeOverridesBase::CXAAtExitOverride(DestructorPtr Destructor,
204 auto& CXXDestructorDataPairs =
205 *reinterpret_cast<CXXDestructorDataPairList*>(DSOHandle);
206 CXXDestructorDataPairs.push_back(std::make_pair(Destructor, Arg));
210 Error LocalCXXRuntimeOverrides::enable(JITDylib &JD,
211 MangleAndInterner &Mangle) {
212 SymbolMap RuntimeInterposes;
213 RuntimeInterposes[Mangle("__dso_handle")] =
214 JITEvaluatedSymbol(toTargetAddress(&DSOHandleOverride),
215 JITSymbolFlags::Exported);
216 RuntimeInterposes[Mangle("__cxa_atexit")] =
217 JITEvaluatedSymbol(toTargetAddress(&CXAAtExitOverride),
218 JITSymbolFlags::Exported);
220 return JD.define(absoluteSymbols(std::move(RuntimeInterposes)));
223 void ItaniumCXAAtExitSupport::registerAtExit(void (*F)(void *), void *Ctx,
225 std::lock_guard<std::mutex> Lock(AtExitsMutex);
226 AtExitRecords[DSOHandle].push_back({F, Ctx});
229 void ItaniumCXAAtExitSupport::runAtExits(void *DSOHandle) {
230 std::vector<AtExitRecord> AtExitsToRun;
233 std::lock_guard<std::mutex> Lock(AtExitsMutex);
234 auto I = AtExitRecords.find(DSOHandle);
235 if (I != AtExitRecords.end()) {
236 AtExitsToRun = std::move(I->second);
237 AtExitRecords.erase(I);
241 while (!AtExitsToRun.empty()) {
242 AtExitsToRun.back().F(AtExitsToRun.back().Ctx);
243 AtExitsToRun.pop_back();
247 DynamicLibrarySearchGenerator::DynamicLibrarySearchGenerator(
248 sys::DynamicLibrary Dylib, char GlobalPrefix, SymbolPredicate Allow)
249 : Dylib(std::move(Dylib)), Allow(std::move(Allow)),
250 GlobalPrefix(GlobalPrefix) {}
252 Expected<std::unique_ptr<DynamicLibrarySearchGenerator>>
253 DynamicLibrarySearchGenerator::Load(const char *FileName, char GlobalPrefix,
254 SymbolPredicate Allow) {
256 auto Lib = sys::DynamicLibrary::getPermanentLibrary(FileName, &ErrMsg);
258 return make_error<StringError>(std::move(ErrMsg), inconvertibleErrorCode());
259 return std::make_unique<DynamicLibrarySearchGenerator>(
260 std::move(Lib), GlobalPrefix, std::move(Allow));
263 Error DynamicLibrarySearchGenerator::tryToGenerate(
264 LookupKind K, JITDylib &JD, JITDylibLookupFlags JDLookupFlags,
265 const SymbolLookupSet &Symbols) {
266 orc::SymbolMap NewSymbols;
268 bool HasGlobalPrefix = (GlobalPrefix != '\0');
270 for (auto &KV : Symbols) {
271 auto &Name = KV.first;
276 if (Allow && !Allow(Name))
279 if (HasGlobalPrefix && (*Name).front() != GlobalPrefix)
282 std::string Tmp((*Name).data() + HasGlobalPrefix,
283 (*Name).size() - HasGlobalPrefix);
284 if (void *Addr = Dylib.getAddressOfSymbol(Tmp.c_str())) {
285 NewSymbols[Name] = JITEvaluatedSymbol(
286 static_cast<JITTargetAddress>(reinterpret_cast<uintptr_t>(Addr)),
287 JITSymbolFlags::Exported);
291 if (NewSymbols.empty())
292 return Error::success();
294 return JD.define(absoluteSymbols(std::move(NewSymbols)));
297 Expected<std::unique_ptr<StaticLibraryDefinitionGenerator>>
298 StaticLibraryDefinitionGenerator::Load(ObjectLayer &L, const char *FileName) {
299 auto ArchiveBuffer = errorOrToExpected(MemoryBuffer::getFile(FileName));
302 return ArchiveBuffer.takeError();
304 return Create(L, std::move(*ArchiveBuffer));
307 Expected<std::unique_ptr<StaticLibraryDefinitionGenerator>>
308 StaticLibraryDefinitionGenerator::Load(ObjectLayer &L, const char *FileName,
310 auto B = object::createBinary(FileName);
312 return B.takeError();
314 // If this is a regular archive then create an instance from it.
315 if (isa<object::Archive>(B->getBinary()))
316 return Create(L, std::move(B->takeBinary().second));
318 // If this is a universal binary then search for a slice matching the given
320 if (auto *UB = cast<object::MachOUniversalBinary>(B->getBinary())) {
321 for (const auto &Obj : UB->objects()) {
322 auto ObjTT = Obj.getTriple();
323 if (ObjTT.getArch() == TT.getArch() &&
324 ObjTT.getSubArch() == TT.getSubArch() &&
325 (TT.getVendor() == Triple::UnknownVendor ||
326 ObjTT.getVendor() == TT.getVendor())) {
327 // We found a match. Create an instance from a buffer covering this
329 auto SliceBuffer = MemoryBuffer::getFileSlice(FileName, Obj.getSize(),
332 return make_error<StringError>(
333 Twine("Could not create buffer for ") + TT.str() + " slice of " +
334 FileName + ": [ " + formatv("{0:x}", Obj.getOffset()) +
335 " .. " + formatv("{0:x}", Obj.getOffset() + Obj.getSize()) +
336 ": " + SliceBuffer.getError().message(),
337 SliceBuffer.getError());
338 return Create(L, std::move(*SliceBuffer));
342 return make_error<StringError>(Twine("Universal binary ") + FileName +
343 " does not contain a slice for " +
345 inconvertibleErrorCode());
348 return make_error<StringError>(Twine("Unrecognized file type for ") +
350 inconvertibleErrorCode());
353 Expected<std::unique_ptr<StaticLibraryDefinitionGenerator>>
354 StaticLibraryDefinitionGenerator::Create(
355 ObjectLayer &L, std::unique_ptr<MemoryBuffer> ArchiveBuffer) {
356 Error Err = Error::success();
358 std::unique_ptr<StaticLibraryDefinitionGenerator> ADG(
359 new StaticLibraryDefinitionGenerator(L, std::move(ArchiveBuffer), Err));
362 return std::move(Err);
364 return std::move(ADG);
367 Error StaticLibraryDefinitionGenerator::tryToGenerate(
368 LookupKind K, JITDylib &JD, JITDylibLookupFlags JDLookupFlags,
369 const SymbolLookupSet &Symbols) {
371 // Don't materialize symbols from static archives unless this is a static
373 if (K != LookupKind::Static)
374 return Error::success();
376 // Bail out early if we've already freed the archive.
378 return Error::success();
380 DenseSet<std::pair<StringRef, StringRef>> ChildBufferInfos;
382 for (const auto &KV : Symbols) {
383 const auto &Name = KV.first;
384 auto Child = Archive->findSym(*Name);
386 return Child.takeError();
389 auto ChildBuffer = (*Child)->getMemoryBufferRef();
391 return ChildBuffer.takeError();
392 ChildBufferInfos.insert(
393 {ChildBuffer->getBuffer(), ChildBuffer->getBufferIdentifier()});
396 for (auto ChildBufferInfo : ChildBufferInfos) {
397 MemoryBufferRef ChildBufferRef(ChildBufferInfo.first,
398 ChildBufferInfo.second);
400 if (auto Err = L.add(JD, MemoryBuffer::getMemBuffer(ChildBufferRef, false)))
404 return Error::success();
407 StaticLibraryDefinitionGenerator::StaticLibraryDefinitionGenerator(
408 ObjectLayer &L, std::unique_ptr<MemoryBuffer> ArchiveBuffer, Error &Err)
409 : L(L), ArchiveBuffer(std::move(ArchiveBuffer)),
410 Archive(std::make_unique<object::Archive>(*this->ArchiveBuffer, Err)) {}
412 } // End namespace orc.
413 } // End namespace llvm.