1 //===---- ExecutionUtils.cpp - Utilities for executing functions in Orc ---===//
3 // The LLVM Compiler Infrastructure
5 // This file is distributed under the University of Illinois Open Source
6 // License. See LICENSE.TXT for details.
8 //===----------------------------------------------------------------------===//
10 #include "llvm/ExecutionEngine/Orc/ExecutionUtils.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/Support/TargetRegistry.h"
17 #include "llvm/Target/TargetMachine.h"
22 CtorDtorIterator::CtorDtorIterator(const GlobalVariable *GV, bool End)
24 GV ? dyn_cast_or_null<ConstantArray>(GV->getInitializer()) : nullptr),
25 I((InitList && End) ? InitList->getNumOperands() : 0) {
28 bool CtorDtorIterator::operator==(const CtorDtorIterator &Other) const {
29 assert(InitList == Other.InitList && "Incomparable iterators.");
33 bool CtorDtorIterator::operator!=(const CtorDtorIterator &Other) const {
34 return !(*this == Other);
37 CtorDtorIterator& CtorDtorIterator::operator++() {
42 CtorDtorIterator CtorDtorIterator::operator++(int) {
43 CtorDtorIterator Temp = *this;
48 CtorDtorIterator::Element CtorDtorIterator::operator*() const {
49 ConstantStruct *CS = dyn_cast<ConstantStruct>(InitList->getOperand(I));
50 assert(CS && "Unrecognized type in llvm.global_ctors/llvm.global_dtors");
52 Constant *FuncC = CS->getOperand(1);
53 Function *Func = nullptr;
55 // Extract function pointer, pulling off any casts.
57 if (Function *F = dyn_cast_or_null<Function>(FuncC)) {
60 } else if (ConstantExpr *CE = dyn_cast_or_null<ConstantExpr>(FuncC)) {
62 FuncC = dyn_cast_or_null<ConstantExpr>(CE->getOperand(0));
66 // This isn't anything we recognize. Bail out with Func left set to null.
71 ConstantInt *Priority = dyn_cast<ConstantInt>(CS->getOperand(0));
72 Value *Data = CS->getNumOperands() == 3 ? CS->getOperand(2) : nullptr;
73 if (Data && !isa<GlobalValue>(Data))
75 return Element(Priority->getZExtValue(), Func, Data);
78 iterator_range<CtorDtorIterator> getConstructors(const Module &M) {
79 const GlobalVariable *CtorsList = M.getNamedGlobal("llvm.global_ctors");
80 return make_range(CtorDtorIterator(CtorsList, false),
81 CtorDtorIterator(CtorsList, true));
84 iterator_range<CtorDtorIterator> getDestructors(const Module &M) {
85 const GlobalVariable *DtorsList = M.getNamedGlobal("llvm.global_dtors");
86 return make_range(CtorDtorIterator(DtorsList, false),
87 CtorDtorIterator(DtorsList, true));
90 void CtorDtorRunner::add(iterator_range<CtorDtorIterator> CtorDtors) {
94 MangleAndInterner Mangle(
95 JD.getExecutionSession(),
96 (*CtorDtors.begin()).Func->getParent()->getDataLayout());
98 for (const auto &CtorDtor : CtorDtors) {
99 assert(CtorDtor.Func && CtorDtor.Func->hasName() &&
100 "Ctor/Dtor function must be named to be runnable under the JIT");
102 // FIXME: Maybe use a symbol promoter here instead.
103 if (CtorDtor.Func->hasLocalLinkage()) {
104 CtorDtor.Func->setLinkage(GlobalValue::ExternalLinkage);
105 CtorDtor.Func->setVisibility(GlobalValue::HiddenVisibility);
108 if (CtorDtor.Data && cast<GlobalValue>(CtorDtor.Data)->isDeclaration()) {
109 dbgs() << " Skipping because why now?\n";
113 CtorDtorsByPriority[CtorDtor.Priority].push_back(
114 Mangle(CtorDtor.Func->getName()));
118 Error CtorDtorRunner::run() {
119 using CtorDtorTy = void (*)();
123 for (auto &KV : CtorDtorsByPriority) {
124 for (auto &Name : KV.second) {
125 auto Added = Names.insert(Name).second;
127 assert(Added && "Ctor/Dtor names clashed");
131 auto &ES = JD.getExecutionSession();
132 if (auto CtorDtorMap =
133 ES.lookup(JITDylibSearchList({{&JD, true}}), std::move(Names),
134 NoDependenciesToRegister, true)) {
135 for (auto &KV : CtorDtorsByPriority) {
136 for (auto &Name : KV.second) {
137 assert(CtorDtorMap->count(Name) && "No entry for Name");
138 auto CtorDtor = reinterpret_cast<CtorDtorTy>(
139 static_cast<uintptr_t>((*CtorDtorMap)[Name].getAddress()));
143 return Error::success();
145 return CtorDtorMap.takeError();
147 CtorDtorsByPriority.clear();
149 return Error::success();
152 void LocalCXXRuntimeOverridesBase::runDestructors() {
153 auto& CXXDestructorDataPairs = DSOHandleOverride;
154 for (auto &P : CXXDestructorDataPairs)
156 CXXDestructorDataPairs.clear();
159 int LocalCXXRuntimeOverridesBase::CXAAtExitOverride(DestructorPtr Destructor,
162 auto& CXXDestructorDataPairs =
163 *reinterpret_cast<CXXDestructorDataPairList*>(DSOHandle);
164 CXXDestructorDataPairs.push_back(std::make_pair(Destructor, Arg));
168 Error LocalCXXRuntimeOverrides::enable(JITDylib &JD,
169 MangleAndInterner &Mangle) {
170 SymbolMap RuntimeInterposes;
171 RuntimeInterposes[Mangle("__dso_handle")] =
172 JITEvaluatedSymbol(toTargetAddress(&DSOHandleOverride),
173 JITSymbolFlags::Exported);
174 RuntimeInterposes[Mangle("__cxa_atexit")] =
175 JITEvaluatedSymbol(toTargetAddress(&CXAAtExitOverride),
176 JITSymbolFlags::Exported);
178 return JD.define(absoluteSymbols(std::move(RuntimeInterposes)));
181 DynamicLibrarySearchGenerator::DynamicLibrarySearchGenerator(
182 sys::DynamicLibrary Dylib, const DataLayout &DL, SymbolPredicate Allow)
183 : Dylib(std::move(Dylib)), Allow(std::move(Allow)),
184 GlobalPrefix(DL.getGlobalPrefix()) {}
186 Expected<DynamicLibrarySearchGenerator>
187 DynamicLibrarySearchGenerator::Load(const char *FileName, const DataLayout &DL,
188 SymbolPredicate Allow) {
190 auto Lib = sys::DynamicLibrary::getPermanentLibrary(FileName, &ErrMsg);
192 return make_error<StringError>(std::move(ErrMsg), inconvertibleErrorCode());
193 return DynamicLibrarySearchGenerator(std::move(Lib), DL, std::move(Allow));
196 SymbolNameSet DynamicLibrarySearchGenerator::
197 operator()(JITDylib &JD, const SymbolNameSet &Names) {
198 orc::SymbolNameSet Added;
199 orc::SymbolMap NewSymbols;
201 bool HasGlobalPrefix = (GlobalPrefix != '\0');
203 for (auto &Name : Names) {
207 if (Allow && !Allow(Name))
210 if (HasGlobalPrefix && (*Name).front() != GlobalPrefix)
213 std::string Tmp((*Name).data() + (HasGlobalPrefix ? 1 : 0), (*Name).size());
214 if (void *Addr = Dylib.getAddressOfSymbol(Tmp.c_str())) {
216 NewSymbols[Name] = JITEvaluatedSymbol(
217 static_cast<JITTargetAddress>(reinterpret_cast<uintptr_t>(Addr)),
218 JITSymbolFlags::Exported);
222 // Add any new symbols to JD. Since the generator is only called for symbols
223 // that are not already defined, this will never trigger a duplicate
224 // definition error, so we can wrap this call in a 'cantFail'.
225 if (!NewSymbols.empty())
226 cantFail(JD.define(absoluteSymbols(std::move(NewSymbols))));
231 } // End namespace orc.
232 } // End namespace llvm.