1 files changed, 45 insertions, 0 deletions
diff --git a/contrib/llvm-project/llvm/lib/Demangle/DLangDemangle.cpp b/contrib/llvm-project/llvm/lib/Demangle/DLangDemangle.cpp
new file mode 100644
index 000000000000..d2f1bf4323ee
--- /dev/null
+++ b/contrib/llvm-project/llvm/lib/Demangle/DLangDemangle.cpp
@@ -0,0 +1,45 @@
+//===--- DLangDemangle.cpp ------------------------------------------------===//
+//
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
+//
+//===----------------------------------------------------------------------===//
+///
+/// \file
+/// This file defines a demangler for the D programming language as specified
+/// in the ABI specification, available at:
+/// https://dlang.org/spec/abi.html#name_mangling
+///
+//===----------------------------------------------------------------------===//
+
+#include "llvm/Demangle/Demangle.h"
+#include "llvm/Demangle/Utility.h"
+
+#include <cstring>
+
+using namespace llvm;
+using llvm::itanium_demangle::OutputBuffer;
+
+char *llvm::dlangDemangle(const char *MangledName) {
+  if (MangledName == nullptr || strncmp(MangledName, "_D", 2) != 0)
+    return nullptr;
+
+  OutputBuffer Demangled;
+  if (!initializeOutputBuffer(nullptr, nullptr, Demangled, 1024))
+    return nullptr;
+
+  if (strcmp(MangledName, "_Dmain") == 0)
+    Demangled << "D main";
+
+  // OutputBuffer's internal buffer is not null terminated and therefore we need
+  // to add it to comply with C null terminated strings.
+  if (Demangled.getCurrentPosition() > 0) {
+    Demangled << '\0';
+    Demangled.setCurrentPosition(Demangled.getCurrentPosition() - 1);
+    return Demangled.getBuffer();
+  }
+
+  free(Demangled.getBuffer());
+  return nullptr;
+}