1 files changed, 51 insertions, 0 deletions
diff --git a/contrib/llvm-project/llvm/lib/Passes/PassPlugin.cpp b/contrib/llvm-project/llvm/lib/Passes/PassPlugin.cpp
new file mode 100644
index 000000000000..ceefa25a703b
--- /dev/null
+++ b/contrib/llvm-project/llvm/lib/Passes/PassPlugin.cpp
@@ -0,0 +1,51 @@
+//===- lib/Passes/PassPluginLoader.cpp - Load Plugins for New PM Passes ---===//
+//
+// 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
+//
+//===----------------------------------------------------------------------===//
+
+#include "llvm/Passes/PassPlugin.h"
+#include "llvm/Support/raw_ostream.h"
+
+#include <cstdint>
+
+using namespace llvm;
+
+Expected<PassPlugin> PassPlugin::Load(const std::string &Filename) {
+  std::string Error;
+  auto Library =
+      sys::DynamicLibrary::getPermanentLibrary(Filename.c_str(), &Error);
+  if (!Library.isValid())
+    return make_error<StringError>(Twine("Could not load library '") +
+                                       Filename + "': " + Error,
+                                   inconvertibleErrorCode());
+
+  PassPlugin P{Filename, Library};
+  intptr_t getDetailsFn =
+      (intptr_t)Library.SearchForAddressOfSymbol("llvmGetPassPluginInfo");
+
+  if (!getDetailsFn)
+    // If the symbol isn't found, this is probably a legacy plugin, which is an
+    // error
+    return make_error<StringError>(Twine("Plugin entry point not found in '") +
+                                       Filename + "'. Is this a legacy plugin?",
+                                   inconvertibleErrorCode());
+
+  P.Info = reinterpret_cast<decltype(llvmGetPassPluginInfo) *>(getDetailsFn)();
+
+  if (P.Info.APIVersion != LLVM_PLUGIN_API_VERSION)
+    return make_error<StringError>(
+        Twine("Wrong API version on plugin '") + Filename + "'. Got version " +
+            Twine(P.Info.APIVersion) + ", supported version is " +
+            Twine(LLVM_PLUGIN_API_VERSION) + ".",
+        inconvertibleErrorCode());
+
+  if (!P.Info.RegisterPassBuilderCallbacks)
+    return make_error<StringError>(Twine("Empty entry callback in plugin '") +
+                                       Filename + "'.'",
+                                   inconvertibleErrorCode());
+
+  return P;
+}