vendor/llvm/llvm-trunk-r338150

1 files changed, 150 insertions, 4 deletions

diff --git a/lib/ExecutionEngine/Orc/ExecutionUtils.cpp b/lib/ExecutionEngine/Orc/ExecutionUtils.cpp
index b7220dba88e9..6157677ce355 100644
--- a/lib/ExecutionEngine/Orc/ExecutionUtils.cpp
+++ b/lib/ExecutionEngine/Orc/ExecutionUtils.cpp
@@ -13,10 +13,51 @@
 #include "llvm/IR/Function.h"
 #include "llvm/IR/GlobalVariable.h"
 #include "llvm/IR/Module.h"
+#include "llvm/Support/TargetRegistry.h"
+#include "llvm/Target/TargetMachine.h"
 
 namespace llvm {
 namespace orc {
 
+JITTargetMachineBuilder::JITTargetMachineBuilder(Triple TT)
+    : TT(std::move(TT)) {}
+
+Expected<JITTargetMachineBuilder> JITTargetMachineBuilder::detectHost() {
+  return JITTargetMachineBuilder(Triple(sys::getProcessTriple()));
+}
+
+Expected<std::unique_ptr<TargetMachine>>
+JITTargetMachineBuilder::createTargetMachine() {
+  if (!Arch.empty()) {
+    Triple::ArchType Type = Triple::getArchTypeForLLVMName(Arch);
+
+    if (Type == Triple::UnknownArch)
+      return make_error<StringError>(std::string("Unknown arch: ") + Arch,
+                                     inconvertibleErrorCode());
+  }
+
+  std::string ErrMsg;
+  auto *TheTarget = TargetRegistry::lookupTarget(TT.getTriple(), ErrMsg);
+  if (!TheTarget)
+    return make_error<StringError>(std::move(ErrMsg), inconvertibleErrorCode());
+
+  auto *TM =
+      TheTarget->createTargetMachine(TT.getTriple(), CPU, Features.getString(),
+                                     Options, RM, CM, OptLevel, /*JIT*/ true);
+  if (!TM)
+    return make_error<StringError>("Could not allocate target machine",
+                                   inconvertibleErrorCode());
+
+  return std::unique_ptr<TargetMachine>(TM);
+}
+
+JITTargetMachineBuilder &JITTargetMachineBuilder::addFeatures(
+    const std::vector<std::string> &FeatureVec) {
+  for (const auto &F : FeatureVec)
+    Features.AddFeature(F);
+  return *this;
+}
+
 CtorDtorIterator::CtorDtorIterator(const GlobalVariable *GV, bool End)
   : InitList(
       GV ? dyn_cast_or_null<ConstantArray>(GV->getInitializer()) : nullptr),
@@ -67,7 +108,9 @@ CtorDtorIterator::Element CtorDtorIterator::operator*() const {
   }
 
   ConstantInt *Priority = dyn_cast<ConstantInt>(CS->getOperand(0));
-  Value *Data = CS->getOperand(2);
+  Value *Data = CS->getNumOperands() == 3 ? CS->getOperand(2) : nullptr;
+  if (Data && !isa<GlobalValue>(Data))
+    Data = nullptr;
   return Element(Priority->getZExtValue(), Func, Data);
 }
 
@@ -83,20 +126,123 @@ iterator_range<CtorDtorIterator> getDestructors(const Module &M) {
                     CtorDtorIterator(DtorsList, true));
 }
 
-void LocalCXXRuntimeOverrides::runDestructors() {
+void CtorDtorRunner2::add(iterator_range<CtorDtorIterator> CtorDtors) {
+  if (CtorDtors.begin() == CtorDtors.end())
+    return;
+
+  MangleAndInterner Mangle(
+      V.getExecutionSession(),
+      (*CtorDtors.begin()).Func->getParent()->getDataLayout());
+
+  for (const auto &CtorDtor : CtorDtors) {
+    assert(CtorDtor.Func && CtorDtor.Func->hasName() &&
+           "Ctor/Dtor function must be named to be runnable under the JIT");
+
+    if (CtorDtor.Data && cast<GlobalValue>(CtorDtor.Data)->isDeclaration()) {
+      dbgs() << "  Skipping because why now?\n";
+      continue;
+    }
+
+    CtorDtorsByPriority[CtorDtor.Priority].push_back(
+        Mangle(CtorDtor.Func->getName()));
+  }
+}
+
+Error CtorDtorRunner2::run() {
+  using CtorDtorTy = void (*)();
+
+  SymbolNameSet Names;
+
+  for (auto &KV : CtorDtorsByPriority) {
+    for (auto &Name : KV.second) {
+      auto Added = Names.insert(Name).second;
+      (void)Added;
+      assert(Added && "Ctor/Dtor names clashed");
+    }
+  }
+
+  if (auto CtorDtorMap = lookup({&V}, std::move(Names))) {
+    for (auto &KV : CtorDtorsByPriority) {
+      for (auto &Name : KV.second) {
+        assert(CtorDtorMap->count(Name) && "No entry for Name");
+        auto CtorDtor = reinterpret_cast<CtorDtorTy>(
+            static_cast<uintptr_t>((*CtorDtorMap)[Name].getAddress()));
+        CtorDtor();
+      }
+    }
+    return Error::success();
+  } else
+    return CtorDtorMap.takeError();
+
+  CtorDtorsByPriority.clear();
+
+  return Error::success();
+}
+
+void LocalCXXRuntimeOverridesBase::runDestructors() {
   auto& CXXDestructorDataPairs = DSOHandleOverride;
   for (auto &P : CXXDestructorDataPairs)
     P.first(P.second);
   CXXDestructorDataPairs.clear();
 }
 
-int LocalCXXRuntimeOverrides::CXAAtExitOverride(DestructorPtr Destructor,
-                                                void *Arg, void *DSOHandle) {
+int LocalCXXRuntimeOverridesBase::CXAAtExitOverride(DestructorPtr Destructor,
+                                                    void *Arg,
+                                                    void *DSOHandle) {
   auto& CXXDestructorDataPairs =
     *reinterpret_cast<CXXDestructorDataPairList*>(DSOHandle);
   CXXDestructorDataPairs.push_back(std::make_pair(Destructor, Arg));
   return 0;
 }
 
+Error LocalCXXRuntimeOverrides2::enable(VSO &V, MangleAndInterner &Mangle) {
+  SymbolMap RuntimeInterposes(
+      {{Mangle("__dso_handle"),
+        JITEvaluatedSymbol(toTargetAddress(&DSOHandleOverride),
+                           JITSymbolFlags::Exported)},
+       {Mangle("__cxa_atexit"),
+        JITEvaluatedSymbol(toTargetAddress(&CXAAtExitOverride),
+                           JITSymbolFlags::Exported)}});
+
+  return V.define(absoluteSymbols(std::move(RuntimeInterposes)));
+}
+
+DynamicLibraryFallbackGenerator::DynamicLibraryFallbackGenerator(
+    sys::DynamicLibrary Dylib, const DataLayout &DL, SymbolPredicate Allow)
+    : Dylib(std::move(Dylib)), Allow(std::move(Allow)),
+      GlobalPrefix(DL.getGlobalPrefix()) {}
+
+SymbolNameSet DynamicLibraryFallbackGenerator::
+operator()(VSO &V, const SymbolNameSet &Names) {
+  orc::SymbolNameSet Added;
+  orc::SymbolMap NewSymbols;
+
+  bool HasGlobalPrefix = (GlobalPrefix != '\0');
+
+  for (auto &Name : Names) {
+    if (!Allow(Name) || (*Name).empty())
+      continue;
+
+    if (HasGlobalPrefix && (*Name).front() != GlobalPrefix)
+      continue;
+
+    std::string Tmp((*Name).data() + (HasGlobalPrefix ? 1 : 0), (*Name).size());
+    if (void *Addr = Dylib.getAddressOfSymbol(Tmp.c_str())) {
+      Added.insert(Name);
+      NewSymbols[Name] = JITEvaluatedSymbol(
+          static_cast<JITTargetAddress>(reinterpret_cast<uintptr_t>(Addr)),
+          JITSymbolFlags::Exported);
+    }
+  }
+
+  // Add any new symbols to V. Since the fallback generator is only called for
+  // symbols that are not already defined, this will never trigger a duplicate
+  // definition error, so we can wrap this call in a 'cantFail'.
+  if (!NewSymbols.empty())
+    cantFail(V.define(absoluteSymbols(std::move(NewSymbols))));
+
+  return Added;
+}
+
 } // End namespace orc.
 } // End namespace llvm.