1 files changed, 196 insertions, 0 deletions
diff --git a/contrib/llvm/lib/ExecutionEngine/Orc/IndirectionUtils.cpp b/contrib/llvm/lib/ExecutionEngine/Orc/IndirectionUtils.cpp
new file mode 100644
index 000000000000..34564e42b10f
--- /dev/null
+++ b/contrib/llvm/lib/ExecutionEngine/Orc/IndirectionUtils.cpp
@@ -0,0 +1,196 @@
+//===---- IndirectionUtils.cpp - Utilities for call indirection in Orc ----===//
+//
+//                     The LLVM Compiler Infrastructure
+//
+// This file is distributed under the University of Illinois Open Source
+// License. See LICENSE.TXT for details.
+//
+//===----------------------------------------------------------------------===//
+
+#include "llvm/ADT/STLExtras.h"
+#include "llvm/ADT/Triple.h"
+#include "llvm/ExecutionEngine/Orc/IndirectionUtils.h"
+#include "llvm/IR/CallSite.h"
+#include "llvm/IR/IRBuilder.h"
+#include "llvm/Transforms/Utils/Cloning.h"
+#include <set>
+#include <sstream>
+
+namespace llvm {
+namespace orc {
+
+void JITCompileCallbackManager::anchor() {}
+void IndirectStubsManager::anchor() {}
+
+Constant* createIRTypedAddress(FunctionType &FT, TargetAddress Addr) {
+  Constant *AddrIntVal =
+    ConstantInt::get(Type::getInt64Ty(FT.getContext()), Addr);
+  Constant *AddrPtrVal =
+    ConstantExpr::getCast(Instruction::IntToPtr, AddrIntVal,
+                          PointerType::get(&FT, 0));
+  return AddrPtrVal;
+}
+
+GlobalVariable* createImplPointer(PointerType &PT, Module &M,
+                                  const Twine &Name, Constant *Initializer) {
+  auto IP = new GlobalVariable(M, &PT, false, GlobalValue::ExternalLinkage,
+                               Initializer, Name, nullptr,
+                               GlobalValue::NotThreadLocal, 0, true);
+  IP->setVisibility(GlobalValue::HiddenVisibility);
+  return IP;
+}
+
+void makeStub(Function &F, Value &ImplPointer) {
+  assert(F.isDeclaration() && "Can't turn a definition into a stub.");
+  assert(F.getParent() && "Function isn't in a module.");
+  Module &M = *F.getParent();
+  BasicBlock *EntryBlock = BasicBlock::Create(M.getContext(), "entry", &F);
+  IRBuilder<> Builder(EntryBlock);
+  LoadInst *ImplAddr = Builder.CreateLoad(&ImplPointer);
+  std::vector<Value*> CallArgs;
+  for (auto &A : F.args())
+    CallArgs.push_back(&A);
+  CallInst *Call = Builder.CreateCall(ImplAddr, CallArgs);
+  Call->setTailCall();
+  Call->setAttributes(F.getAttributes());
+  if (F.getReturnType()->isVoidTy())
+    Builder.CreateRetVoid();
+  else
+    Builder.CreateRet(Call);
+}
+
+// Utility class for renaming global values and functions during partitioning.
+class GlobalRenamer {
+public:
+
+  static bool needsRenaming(const Value &New) {
+    return !New.hasName() || New.getName().startswith("\01L");
+  }
+
+  const std::string& getRename(const Value &Orig) {
+    // See if we have a name for this global.
+    {
+      auto I = Names.find(&Orig);
+      if (I != Names.end())
+        return I->second;
+    }
+
+    // Nope. Create a new one.
+    // FIXME: Use a more robust uniquing scheme. (This may blow up if the user
+    //        writes a "__orc_anon[[:digit:]]* method).
+    unsigned ID = Names.size();
+    std::ostringstream NameStream;
+    NameStream << "__orc_anon" << ID++;
+    auto I = Names.insert(std::make_pair(&Orig, NameStream.str()));
+    return I.first->second;
+  }
+private:
+  DenseMap<const Value*, std::string> Names;
+};
+
+static void raiseVisibilityOnValue(GlobalValue &V, GlobalRenamer &R) {
+  if (V.hasLocalLinkage()) {
+    if (R.needsRenaming(V))
+      V.setName(R.getRename(V));
+    V.setLinkage(GlobalValue::ExternalLinkage);
+    V.setVisibility(GlobalValue::HiddenVisibility);
+  }
+  V.setUnnamedAddr(false);
+  assert(!R.needsRenaming(V) && "Invalid global name.");
+}
+
+void makeAllSymbolsExternallyAccessible(Module &M) {
+  GlobalRenamer Renamer;
+
+  for (auto &F : M)
+    raiseVisibilityOnValue(F, Renamer);
+
+  for (auto &GV : M.globals())
+    raiseVisibilityOnValue(GV, Renamer);
+
+  for (auto &A : M.aliases())
+    raiseVisibilityOnValue(A, Renamer);
+}
+
+Function* cloneFunctionDecl(Module &Dst, const Function &F,
+                            ValueToValueMapTy *VMap) {
+  assert(F.getParent() != &Dst && "Can't copy decl over existing function.");
+  Function *NewF =
+    Function::Create(cast<FunctionType>(F.getType()->getElementType()),
+                     F.getLinkage(), F.getName(), &Dst);
+  NewF->copyAttributesFrom(&F);
+
+  if (VMap) {
+    (*VMap)[&F] = NewF;
+    auto NewArgI = NewF->arg_begin();
+    for (auto ArgI = F.arg_begin(), ArgE = F.arg_end(); ArgI != ArgE;
+         ++ArgI, ++NewArgI)
+      (*VMap)[&*ArgI] = &*NewArgI;
+  }
+
+  return NewF;
+}
+
+void moveFunctionBody(Function &OrigF, ValueToValueMapTy &VMap,
+                      ValueMaterializer *Materializer,
+                      Function *NewF) {
+  assert(!OrigF.isDeclaration() && "Nothing to move");
+  if (!NewF)
+    NewF = cast<Function>(VMap[&OrigF]);
+  else
+    assert(VMap[&OrigF] == NewF && "Incorrect function mapping in VMap.");
+  assert(NewF && "Function mapping missing from VMap.");
+  assert(NewF->getParent() != OrigF.getParent() &&
+         "moveFunctionBody should only be used to move bodies between "
+         "modules.");
+
+  SmallVector<ReturnInst *, 8> Returns; // Ignore returns cloned.
+  CloneFunctionInto(NewF, &OrigF, VMap, /*ModuleLevelChanges=*/true, Returns,
+                    "", nullptr, nullptr, Materializer);
+  OrigF.deleteBody();
+}
+
+GlobalVariable* cloneGlobalVariableDecl(Module &Dst, const GlobalVariable &GV,
+                                        ValueToValueMapTy *VMap) {
+  assert(GV.getParent() != &Dst && "Can't copy decl over existing global var.");
+  GlobalVariable *NewGV = new GlobalVariable(
+      Dst, GV.getType()->getElementType(), GV.isConstant(),
+      GV.getLinkage(), nullptr, GV.getName(), nullptr,
+      GV.getThreadLocalMode(), GV.getType()->getAddressSpace());
+  NewGV->copyAttributesFrom(&GV);
+  if (VMap)
+    (*VMap)[&GV] = NewGV;
+  return NewGV;
+}
+
+void moveGlobalVariableInitializer(GlobalVariable &OrigGV,
+                                   ValueToValueMapTy &VMap,
+                                   ValueMaterializer *Materializer,
+                                   GlobalVariable *NewGV) {
+  assert(OrigGV.hasInitializer() && "Nothing to move");
+  if (!NewGV)
+    NewGV = cast<GlobalVariable>(VMap[&OrigGV]);
+  else
+    assert(VMap[&OrigGV] == NewGV &&
+           "Incorrect global variable mapping in VMap.");
+  assert(NewGV->getParent() != OrigGV.getParent() &&
+         "moveGlobalVariable should only be used to move initializers between "
+         "modules");
+
+  NewGV->setInitializer(MapValue(OrigGV.getInitializer(), VMap, RF_None,
+                                 nullptr, Materializer));
+}
+
+GlobalAlias* cloneGlobalAliasDecl(Module &Dst, const GlobalAlias &OrigA,
+                                  ValueToValueMapTy &VMap) {
+  assert(OrigA.getAliasee() && "Original alias doesn't have an aliasee?");
+  auto *NewA = GlobalAlias::create(OrigA.getValueType(),
+                                   OrigA.getType()->getPointerAddressSpace(),
+                                   OrigA.getLinkage(), OrigA.getName(), &Dst);
+  NewA->copyAttributesFrom(&OrigA);
+  VMap[&OrigA] = NewA;
+  return NewA;
+}
+
+} // End namespace orc.
+} // End namespace llvm.