Reland "[clang-repl] Allow loading of plugins in clang-repl."

Differential revision: https://reviews.llvm.org/D110484

1 files changed, 22 insertions, 0 deletions

diff --git a/clang/lib/Frontend/CompilerInstance.cpp b/clang/lib/Frontend/CompilerInstance.cpp
index 8de2e75..a9c7566 100644
--- a/clang/lib/Frontend/CompilerInstance.cpp
+++ b/clang/lib/Frontend/CompilerInstance.cpp
@@ -23,6 +23,7 @@
 #include "clang/Frontend/FrontendAction.h"
 #include "clang/Frontend/FrontendActions.h"
 #include "clang/Frontend/FrontendDiagnostic.h"
+#include "clang/Frontend/FrontendPluginRegistry.h"
 #include "clang/Frontend/LogDiagnosticPrinter.h"
 #include "clang/Frontend/SerializedDiagnosticPrinter.h"
 #include "clang/Frontend/TextDiagnosticPrinter.h"
@@ -1029,6 +1030,27 @@ bool CompilerInstance::ExecuteAction(FrontendAction &Act) {
   return !getDiagnostics().getClient()->getNumErrors();
 }
 
+void CompilerInstance::LoadRequestedPlugins() {
+  // Load any requested plugins.
+  for (const std::string &Path : getFrontendOpts().Plugins) {
+    std::string Error;
+    if (llvm::sys::DynamicLibrary::LoadLibraryPermanently(Path.c_str(), &Error))
+      getDiagnostics().Report(diag::err_fe_unable_to_load_plugin)
+          << Path << Error;
+  }
+
+  // Check if any of the loaded plugins replaces the main AST action
+  for (const FrontendPluginRegistry::entry &Plugin :
+       FrontendPluginRegistry::entries()) {
+    std::unique_ptr<PluginASTAction> P(Plugin.instantiate());
+    if (P->getActionType() == PluginASTAction::ReplaceAction) {
+      getFrontendOpts().ProgramAction = clang::frontend::PluginAction;
+      getFrontendOpts().ActionName = Plugin.getName().str();
+      break;
+    }
+  }
+}
+
 /// Determine the appropriate source input kind based on language
 /// options.
 static Language getLanguageFromOptions(const LangOptions &LangOpts) {