vendor/llvm/llvm-trunk-r351319

1 files changed, 65 insertions, 0 deletions

diff --git a/lib/ExecutionEngine/Orc/ThreadSafeModule.cpp b/lib/ExecutionEngine/Orc/ThreadSafeModule.cpp
new file mode 100644
index 000000000000..9525b168fbd3
--- /dev/null
+++ b/lib/ExecutionEngine/Orc/ThreadSafeModule.cpp
@@ -0,0 +1,65 @@
+//===-- ThreadSafeModule.cpp - Thread safe Module, Context, and Utilities
+//h-===//
+//
+//                     The LLVM Compiler Infrastructure
+//
+// This file is distributed under the University of Illinois Open Source
+// License. See LICENSE.TXT for details.
+//
+//===----------------------------------------------------------------------===//
+
+#include "llvm/ExecutionEngine/Orc/ThreadSafeModule.h"
+#include "llvm/Bitcode/BitcodeReader.h"
+#include "llvm/Bitcode/BitcodeWriter.h"
+#include "llvm/Transforms/Utils/Cloning.h"
+
+namespace llvm {
+namespace orc {
+
+ThreadSafeModule cloneToNewContext(ThreadSafeModule &TSM,
+                                   GVPredicate ShouldCloneDef,
+                                   GVModifier UpdateClonedDefSource) {
+  assert(TSM && "Can not clone null module");
+
+  if (!ShouldCloneDef)
+    ShouldCloneDef = [](const GlobalValue &) { return true; };
+
+  auto Lock = TSM.getContextLock();
+
+  SmallVector<char, 1> ClonedModuleBuffer;
+
+  {
+    std::set<GlobalValue *> ClonedDefsInSrc;
+    ValueToValueMapTy VMap;
+    auto Tmp = CloneModule(*TSM.getModule(), VMap, [&](const GlobalValue *GV) {
+      if (ShouldCloneDef(*GV)) {
+        ClonedDefsInSrc.insert(const_cast<GlobalValue *>(GV));
+        return true;
+      }
+      return false;
+    });
+
+    if (UpdateClonedDefSource)
+      for (auto *GV : ClonedDefsInSrc)
+        UpdateClonedDefSource(*GV);
+
+    BitcodeWriter BCWriter(ClonedModuleBuffer);
+
+    BCWriter.writeModule(*Tmp);
+    BCWriter.writeSymtab();
+    BCWriter.writeStrtab();
+  }
+
+  MemoryBufferRef ClonedModuleBufferRef(
+      StringRef(ClonedModuleBuffer.data(), ClonedModuleBuffer.size()),
+      "cloned module buffer");
+  ThreadSafeContext NewTSCtx(llvm::make_unique<LLVMContext>());
+
+  auto ClonedModule =
+      cantFail(parseBitcodeFile(ClonedModuleBufferRef, *NewTSCtx.getContext()));
+  ClonedModule->setModuleIdentifier(TSM.getModule()->getName());
+  return ThreadSafeModule(std::move(ClonedModule), std::move(NewTSCtx));
+}
+
+} // end namespace orc
+} // end namespace llvm