Re-land r329273: [Plugins] Add a slim plugin API to work together with the new PM
Fix unittest: Do not link LLVM into the test plugin.
Additionally, remove an unrelated change that slipped in in r329273.
llvm-svn: 329293
diff --git a/llvm/lib/Passes/PassPlugin.cpp b/llvm/lib/Passes/PassPlugin.cpp
new file mode 100644
index 0000000..8f689ee
--- /dev/null
+++ b/llvm/lib/Passes/PassPlugin.cpp
@@ -0,0 +1,50 @@
+//===- lib/Passes/PassPluginLoader.cpp - Load Plugins for New PM Passes ---===//
+//
+// The LLVM Compiler Infrastructure
+//
+// This file is distributed under the University of Illinois Open Source
+// License. See LICENSE.TXT for details.
+//
+//===----------------------------------------------------------------------===//
+
+#include "llvm/Passes/PassPlugin.h"
+#include "llvm/Support/raw_ostream.h"
+
+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};
+ auto *getDetailsFn =
+ 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;
+}