lib/Passes/PassPlugin.cpp

   1 //===- lib/Passes/PassPluginLoader.cpp - Load Plugins for New PM Passes ---===//
   2 //
   3 //                     The LLVM Compiler Infrastructure
   4 //
   5 // This file is distributed under the University of Illinois Open Source
   6 // License. See LICENSE.TXT for details.
   7 //
   8 //===----------------------------------------------------------------------===//
   9
  10 #include "llvm/Passes/PassPlugin.h"
  11 #include "llvm/Support/raw_ostream.h"
  12
  13 #include <cstdint>
  14
  15 using namespace llvm;
  16
  17 Expected<PassPlugin> PassPlugin::Load(const std::string &Filename) {
  18   std::string Error;
  19   auto Library =
  20       sys::DynamicLibrary::getPermanentLibrary(Filename.c_str(), &Error);
  21   if (!Library.isValid())
  22     return make_error<StringError>(Twine("Could not load library '") +
  23                                        Filename + "': " + Error,
  24                                    inconvertibleErrorCode());
  25
  26   PassPlugin P{Filename, Library};
  27   intptr_t getDetailsFn =
  28       (intptr_t)Library.SearchForAddressOfSymbol("llvmGetPassPluginInfo");
  29
  30   if (!getDetailsFn)
  31     // If the symbol isn't found, this is probably a legacy plugin, which is an
  32     // error
  33     return make_error<StringError>(Twine("Plugin entry point not found in '") +
  34                                        Filename + "'. Is this a legacy plugin?",
  35                                    inconvertibleErrorCode());
  36
  37   P.Info = reinterpret_cast<decltype(llvmGetPassPluginInfo) *>(getDetailsFn)();
  38
  39   if (P.Info.APIVersion != LLVM_PLUGIN_API_VERSION)
  40     return make_error<StringError>(
  41         Twine("Wrong API version on plugin '") + Filename + "'. Got version " +
  42             Twine(P.Info.APIVersion) + ", supported version is " +
  43             Twine(LLVM_PLUGIN_API_VERSION) + ".",
  44         inconvertibleErrorCode());
  45
  46   if (!P.Info.RegisterPassBuilderCallbacks)
  47     return make_error<StringError>(Twine("Empty entry callback in plugin '") +
  48                                        Filename + "'.'",
  49                                    inconvertibleErrorCode());
  50
  51   return P;
  52 }