1 files changed, 118 insertions, 0 deletions
diff --git a/lib/ExecutionEngine/Orc/IndirectionUtils.cpp b/lib/ExecutionEngine/Orc/IndirectionUtils.cpp
new file mode 100644
index 0000000..61c947f
--- /dev/null
+++ b/lib/ExecutionEngine/Orc/IndirectionUtils.cpp
@@ -0,0 +1,118 @@
+//===---- 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/Triple.h"
+#include "llvm/ExecutionEngine/Orc/CloneSubModule.h"
+#include "llvm/ExecutionEngine/Orc/IndirectionUtils.h"
+#include "llvm/IR/CallSite.h"
+#include "llvm/IR/IRBuilder.h"
+#include <set>
+
+namespace llvm {
+namespace orc {
+
+GlobalVariable* createImplPointer(Function &F, const Twine &Name,
+                                  Constant *Initializer) {
+  assert(F.getParent() && "Function isn't in a module.");
+  if (!Initializer)
+    Initializer = Constant::getNullValue(F.getType());
+  Module &M = *F.getParent();
+  return new GlobalVariable(M, F.getType(), false, GlobalValue::ExternalLinkage,
+                            Initializer, Name, nullptr,
+                            GlobalValue::NotThreadLocal, 0, true);
+}
+
+void makeStub(Function &F, GlobalVariable &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();
+  Builder.CreateRet(Call);
+}
+
+void partition(Module &M, const ModulePartitionMap &PMap) {
+
+  for (auto &KVPair : PMap) {
+
+    auto ExtractGlobalVars =
+      [&](GlobalVariable &New, const GlobalVariable &Orig,
+          ValueToValueMapTy &VMap) {
+        if (KVPair.second.count(&Orig)) {
+          copyGVInitializer(New, Orig, VMap);
+        }
+        if (New.getLinkage() == GlobalValue::PrivateLinkage) {
+          New.setLinkage(GlobalValue::ExternalLinkage);
+          New.setVisibility(GlobalValue::HiddenVisibility);
+        }
+      };
+
+    auto ExtractFunctions =
+      [&](Function &New, const Function &Orig, ValueToValueMapTy &VMap) {
+        if (KVPair.second.count(&Orig))
+          copyFunctionBody(New, Orig, VMap);
+        if (New.getLinkage() == GlobalValue::InternalLinkage) {
+          New.setLinkage(GlobalValue::ExternalLinkage);
+          New.setVisibility(GlobalValue::HiddenVisibility);
+        }
+      };
+
+    CloneSubModule(*KVPair.first, M, ExtractGlobalVars, ExtractFunctions,
+                   false);
+  }
+}
+
+FullyPartitionedModule fullyPartition(Module &M) {
+  FullyPartitionedModule MP;
+
+  ModulePartitionMap PMap;
+
+  for (auto &F : M) {
+
+    if (F.isDeclaration())
+      continue;
+
+    std::string NewModuleName = (M.getName() + "." + F.getName()).str();
+    MP.Functions.push_back(
+      llvm::make_unique<Module>(NewModuleName, M.getContext()));
+    MP.Functions.back()->setDataLayout(M.getDataLayout());
+    PMap[MP.Functions.back().get()].insert(&F);
+  }
+
+  MP.GlobalVars =
+    llvm::make_unique<Module>((M.getName() + ".globals_and_stubs").str(),
+                              M.getContext());
+  MP.GlobalVars->setDataLayout(M.getDataLayout());
+
+  MP.Commons =
+    llvm::make_unique<Module>((M.getName() + ".commons").str(), M.getContext());
+  MP.Commons->setDataLayout(M.getDataLayout());
+
+  // Make sure there's at least an empty set for the stubs map or we'll fail
+  // to clone anything for it (including the decls).
+  PMap[MP.GlobalVars.get()] = ModulePartitionMap::mapped_type();
+  for (auto &GV : M.globals())
+    if (GV.getLinkage() == GlobalValue::CommonLinkage)
+      PMap[MP.Commons.get()].insert(&GV);
+    else
+      PMap[MP.GlobalVars.get()].insert(&GV);
+
+  partition(M, PMap);
+
+  return MP;
+}
+
+} // End namespace orc.
+} // End namespace llvm.