4 files changed, 131 insertions, 0 deletions
diff --git a/unittests/Passes/CMakeLists.txt b/unittests/Passes/CMakeLists.txt
new file mode 100644
index 000000000000..d90df209d4ec
--- /dev/null
+++ b/unittests/Passes/CMakeLists.txt
@@ -0,0 +1,29 @@
+# Needed by LLVM's CMake checks because this file defines multiple targets.
+set(LLVM_OPTIONAL_SOURCES PluginsTest.cpp TestPlugin.cpp)
+
+# If plugins are disabled, this test will disable itself at runtime. Otherwise,
+# reconfiguring with plugins disabled will leave behind a stale executable.
+if (LLVM_ENABLE_PLUGINS)
+  add_definitions(-DLLVM_ENABLE_PLUGINS)
+endif()
+
+set(LLVM_LINK_COMPONENTS Support Passes Core)
+add_llvm_unittest(PluginsTests
+  PluginsTest.cpp
+  )
+export_executable_symbols(PluginsTests)
+
+set(LLVM_LINK_COMPONENTS)
+add_llvm_loadable_module(TestPlugin
+  TestPlugin.cpp
+  )
+
+# Put plugin next to the unit test executable.
+set_output_directory(TestPlugin
+  BINARY_DIR ${CMAKE_CURRENT_BINARY_DIR}/${CMAKE_CFG_INTDIR}
+  LIBRARY_DIR ${CMAKE_CURRENT_BINARY_DIR}/${CMAKE_CFG_INTDIR}
+  )
+set_target_properties(TestPlugin PROPERTIES FOLDER "Tests")
+
+add_dependencies(TestPlugin intrinsics_gen)
+add_dependencies(PluginsTests TestPlugin)
diff --git a/unittests/Passes/PluginsTest.cpp b/unittests/Passes/PluginsTest.cpp
new file mode 100644
index 000000000000..726978714e87
--- /dev/null
+++ b/unittests/Passes/PluginsTest.cpp
@@ -0,0 +1,61 @@
+//===- unittests/Passes/Plugins/PluginsTest.cpp ---------------------------===//
+//
+//                     The LLVM Compiler Infrastructure
+//
+// This file is distributed under the University of Illinois Open Source
+// License. See LICENSE.TXT for details.
+//
+//===----------------------------------------------------------------------===//
+
+#include "llvm/Analysis/CGSCCPassManager.h"
+#include "llvm/Config/config.h"
+#include "llvm/IR/PassManager.h"
+#include "llvm/Passes/PassBuilder.h"
+#include "llvm/Passes/PassPlugin.h"
+#include "llvm/Support/FileSystem.h"
+#include "llvm/Support/ManagedStatic.h"
+#include "llvm/Support/Path.h"
+#include "llvm/Transforms/Scalar/LoopPassManager.h"
+#include "gtest/gtest.h"
+
+#include "TestPlugin.h"
+
+#include <cstdint>
+
+using namespace llvm;
+
+void anchor() {}
+
+static std::string LibPath(const std::string Name = "TestPlugin") {
+  const std::vector<testing::internal::string> &Argvs =
+      testing::internal::GetArgvs();
+  const char *Argv0 = Argvs.size() > 0 ? Argvs[0].c_str() : "PluginsTests";
+  void *Ptr = (void *)(intptr_t)anchor;
+  std::string Path = sys::fs::getMainExecutable(Argv0, Ptr);
+  llvm::SmallString<256> Buf{sys::path::parent_path(Path)};
+  sys::path::append(Buf, (Name + LTDL_SHLIB_EXT).c_str());
+  return Buf.str();
+}
+
+TEST(PluginsTests, LoadPlugin) {
+#if !defined(LLVM_ENABLE_PLUGINS)
+  // Disable the test if plugins are disabled.
+  return;
+#endif
+
+  auto PluginPath = LibPath();
+  ASSERT_NE("", PluginPath);
+
+  Expected<PassPlugin> Plugin = PassPlugin::Load(PluginPath);
+  ASSERT_TRUE(!!Plugin) << "Plugin path: " << PluginPath;
+
+  ASSERT_EQ(TEST_PLUGIN_NAME, Plugin->getPluginName());
+  ASSERT_EQ(TEST_PLUGIN_VERSION, Plugin->getPluginVersion());
+
+  PassBuilder PB;
+  ModulePassManager PM;
+  ASSERT_FALSE(PB.parsePassPipeline(PM, "plugin-pass"));
+
+  Plugin->registerPassBuilderCallbacks(PB);
+  ASSERT_TRUE(PB.parsePassPipeline(PM, "plugin-pass"));
+}
diff --git a/unittests/Passes/TestPlugin.cpp b/unittests/Passes/TestPlugin.cpp
new file mode 100644
index 000000000000..3dc5cdc84768
--- /dev/null
+++ b/unittests/Passes/TestPlugin.cpp
@@ -0,0 +1,39 @@
+//===- unittests/Passes/Plugins/Plugin.cpp --------------------------------===//
+//
+//                     The LLVM Compiler Infrastructure
+//
+// This file is distributed under the University of Illinois Open Source
+// License. See LICENSE.TXT for details.
+//
+//===----------------------------------------------------------------------===//
+
+#include "llvm/Passes/PassBuilder.h"
+#include "llvm/Passes/PassPlugin.h"
+
+#include "TestPlugin.h"
+
+using namespace llvm;
+
+struct TestModulePass : public PassInfoMixin<TestModulePass> {
+  PreservedAnalyses run(Module &M, ModuleAnalysisManager &MAM) {
+    return PreservedAnalyses::all();
+  }
+};
+
+void registerCallbacks(PassBuilder &PB) {
+  PB.registerPipelineParsingCallback(
+      [](StringRef Name, ModulePassManager &PM,
+         ArrayRef<PassBuilder::PipelineElement> InnerPipeline) {
+        if (Name == "plugin-pass") {
+          PM.addPass(TestModulePass());
+          return true;
+        }
+        return false;
+      });
+}
+
+extern "C" ::llvm::PassPluginLibraryInfo LLVM_ATTRIBUTE_WEAK
+llvmGetPassPluginInfo() {
+  return {LLVM_PLUGIN_API_VERSION, TEST_PLUGIN_NAME, TEST_PLUGIN_VERSION,
+          registerCallbacks};
+}
diff --git a/unittests/Passes/TestPlugin.h b/unittests/Passes/TestPlugin.h
new file mode 100644
index 000000000000..801a89065cda
--- /dev/null
+++ b/unittests/Passes/TestPlugin.h
@@ -0,0 +1,2 @@
+#define TEST_PLUGIN_NAME "TestPlugin"
+#define TEST_PLUGIN_VERSION "0.1-unit"