1 //===- lib/Passes/PassPluginLoader.cpp - Load Plugins for New PM Passes ---===// 2 // 3 // Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions. 4 // See https://llvm.org/LICENSE.txt for license information. 5 // SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception 6 // 7 //===----------------------------------------------------------------------===// 8 9 #include "llvm/Passes/PassPlugin.h" 10 #include "llvm/Support/raw_ostream.h" 11 12 #include <cstdint> 13 14 using namespace llvm; 15 16 Expected<PassPlugin> PassPlugin::Load(const std::string &Filename) { 17 std::string Error; 18 auto Library = 19 sys::DynamicLibrary::getPermanentLibrary(Filename.c_str(), &Error); 20 if (!Library.isValid()) 21 return make_error<StringError>(Twine("Could not load library '") + 22 Filename + "': " + Error, 23 inconvertibleErrorCode()); 24 25 PassPlugin P{Filename, Library}; 26 27 // llvmGetPassPluginInfo should be resolved to the definition from the plugin 28 // we are currently loading. 29 intptr_t getDetailsFn = 30 (intptr_t)Library.getAddressOfSymbol("llvmGetPassPluginInfo"); 31 32 if (!getDetailsFn) 33 // If the symbol isn't found, this is probably a legacy plugin, which is an 34 // error 35 return make_error<StringError>(Twine("Plugin entry point not found in '") + 36 Filename + "'. Is this a legacy plugin?", 37 inconvertibleErrorCode()); 38 39 P.Info = reinterpret_cast<decltype(llvmGetPassPluginInfo) *>(getDetailsFn)(); 40 41 if (P.Info.APIVersion != LLVM_PLUGIN_API_VERSION) 42 return make_error<StringError>( 43 Twine("Wrong API version on plugin '") + Filename + "'. Got version " + 44 Twine(P.Info.APIVersion) + ", supported version is " + 45 Twine(LLVM_PLUGIN_API_VERSION) + ".", 46 inconvertibleErrorCode()); 47 48 if (!P.Info.RegisterPassBuilderCallbacks) 49 return make_error<StringError>(Twine("Empty entry callback in plugin '") + 50 Filename + "'.'", 51 inconvertibleErrorCode()); 52 53 return P; 54 } 55