1 files changed, 72 insertions, 0 deletions
diff --git a/src/rustllvm/Linker.cpp b/src/rustllvm/Linker.cpp
new file mode 100644
index 00000000000..534e4b91090
--- /dev/null
+++ b/src/rustllvm/Linker.cpp
@@ -0,0 +1,72 @@
+// Copyright 2018 The Rust Project Developers. See the COPYRIGHT
+// file at the top-level directory of this distribution and at
+// http://rust-lang.org/COPYRIGHT.
+//
+// Licensed under the Apache License, Version 2.0 <LICENSE-APACHE or
+// http://www.apache.org/licenses/LICENSE-2.0> or the MIT license
+// <LICENSE-MIT or http://opensource.org/licenses/MIT>, at your
+// option. This file may not be copied, modified, or distributed
+// except according to those terms.
+
+#include "llvm/Linker/Linker.h"
+
+#include "rustllvm.h"
+
+using namespace llvm;
+
+struct RustLinker {
+  Linker L;
+  LLVMContext &Ctx;
+
+  RustLinker(Module &M) :
+    L(M),
+    Ctx(M.getContext())
+  {}
+};
+
+extern "C" RustLinker*
+LLVMRustLinkerNew(LLVMModuleRef DstRef) {
+  Module *Dst = unwrap(DstRef);
+
+  auto Ret = llvm::make_unique<RustLinker>(*Dst);
+  return Ret.release();
+}
+
+extern "C" void
+LLVMRustLinkerFree(RustLinker *L) {
+  delete L;
+}
+
+extern "C" bool
+LLVMRustLinkerAdd(RustLinker *L, char *BC, size_t Len) {
+  std::unique_ptr<MemoryBuffer> Buf =
+      MemoryBuffer::getMemBufferCopy(StringRef(BC, Len));
+
+#if LLVM_VERSION_GE(4, 0)
+  Expected<std::unique_ptr<Module>> SrcOrError =
+      llvm::getLazyBitcodeModule(Buf->getMemBufferRef(), L->Ctx);
+  if (!SrcOrError) {
+    LLVMRustSetLastError(toString(SrcOrError.takeError()).c_str());
+    return false;
+  }
+
+  auto Src = std::move(*SrcOrError);
+#else
+  ErrorOr<std::unique_ptr<Module>> Src =
+      llvm::getLazyBitcodeModule(std::move(Buf), L->Ctx);
+  if (!Src) {
+    LLVMRustSetLastError(Src.getError().message().c_str());
+    return false;
+  }
+#endif
+
+#if LLVM_VERSION_GE(4, 0)
+  if (L->L.linkInModule(std::move(Src))) {
+#else
+  if (L->L.linkInModule(std::move(Src.get()))) {
+#endif
+    LLVMRustSetLastError("");
+    return false;
+  }
+  return true;
+}