Adjust Registry interface to not require plugins to export a registry

Currently the Registry class contains the vestiges of a previous attempt to
allow plugins to be used on Windows without using BUILD_SHARED_LIBS, where a
plugin would have its own copy of a registry and export it to be imported by
the tool that's loading the plugin. This only works if the plugin is entirely
self-contained with the only interface between the plugin and tool being the
registry, and in particular this conflicts with how IR pass plugins work.

This patch changes things so that instead the add_node function of the registry
is exported by the tool and then imported by the plugin, which solves this
problem and also means that instead of every plugin having to export every
registry they use instead LLVM only has to export the add_node functions. This
allows plugins that use a registry to work on Windows if
LLVM_EXPORT_SYMBOLS_FOR_PLUGINS is used.

Differential Revision: http://reviews.llvm.org/D21385


git-svn-id: https://llvm.org/svn/llvm-project/cfe/trunk@276856 91177308-0d34-0410-b5e6-96231b3b80d8

7 files changed, 6 insertions, 9 deletions

diff --git a/examples/AnnotateFunctions/CMakeLists.txt b/examples/AnnotateFunctions/CMakeLists.txt
index cf564d527d..5684abf238 100644
--- a/examples/AnnotateFunctions/CMakeLists.txt
+++ b/examples/AnnotateFunctions/CMakeLists.txt
@@ -1,4 +1,4 @@
-add_llvm_loadable_module(AnnotateFunctions AnnotateFunctions.cpp)
+add_llvm_loadable_module(AnnotateFunctions AnnotateFunctions.cpp PLUGIN_TOOL clang)
 
 if(LLVM_ENABLE_PLUGINS AND (WIN32 OR CYGWIN))
   target_link_libraries(AnnotateFunctions PRIVATE
diff --git a/examples/PrintFunctionNames/CMakeLists.txt b/examples/PrintFunctionNames/CMakeLists.txt
index 5a00d5036f..f5f818866c 100644
--- a/examples/PrintFunctionNames/CMakeLists.txt
+++ b/examples/PrintFunctionNames/CMakeLists.txt
@@ -9,7 +9,7 @@ if( NOT MSVC ) # MSVC mangles symbols differently, and
   endif()
 endif()
 
-add_llvm_loadable_module(PrintFunctionNames PrintFunctionNames.cpp)
+add_llvm_loadable_module(PrintFunctionNames PrintFunctionNames.cpp PLUGIN_TOOL clang)
 
 if(LLVM_ENABLE_PLUGINS AND (WIN32 OR CYGWIN))
   target_link_libraries(PrintFunctionNames PRIVATE
diff --git a/include/clang/Frontend/FrontendPluginRegistry.h b/include/clang/Frontend/FrontendPluginRegistry.h
index ecab630c12..9d7ee08d95 100644
--- a/include/clang/Frontend/FrontendPluginRegistry.h
+++ b/include/clang/Frontend/FrontendPluginRegistry.h
@@ -13,9 +13,6 @@
 #include "clang/Frontend/FrontendAction.h"
 #include "llvm/Support/Registry.h"
 
-// Instantiated in FrontendAction.cpp.
-extern template class llvm::Registry<clang::PluginASTAction>;
-
 namespace clang {
 
 /// The frontend plugin registry.
diff --git a/include/clang/Lex/Preprocessor.h b/include/clang/Lex/Preprocessor.h
index 30cc37f6f8..4a46bb8d05 100644
--- a/include/clang/Lex/Preprocessor.h
+++ b/include/clang/Lex/Preprocessor.h
@@ -1956,6 +1956,4 @@ typedef llvm::Registry<PragmaHandler> PragmaHandlerRegistry;
 
 }  // end namespace clang
 
-extern template class llvm::Registry<clang::PragmaHandler>;
-
 #endif
diff --git a/lib/Frontend/FrontendAction.cpp b/lib/Frontend/FrontendAction.cpp
index d2c2a80394..2945b8925f 100644
--- a/lib/Frontend/FrontendAction.cpp
+++ b/lib/Frontend/FrontendAction.cpp
@@ -33,7 +33,7 @@
 #include <system_error>
 using namespace clang;
 
-template class llvm::Registry<clang::PluginASTAction>;
+LLVM_INSTANTIATE_REGISTRY(FrontendPluginRegistry)
 
 namespace {
 
diff --git a/lib/Lex/Preprocessor.cpp b/lib/Lex/Preprocessor.cpp
index 3654ba080d..6812da8212 100644
--- a/lib/Lex/Preprocessor.cpp
+++ b/lib/Lex/Preprocessor.cpp
@@ -54,7 +54,7 @@
 #include <utility>
 using namespace clang;
 
-template class llvm::Registry<clang::PragmaHandler>;
+LLVM_INSTANTIATE_REGISTRY(PragmaHandlerRegistry)
 
 //===----------------------------------------------------------------------===//
 ExternalPreprocessorSource::~ExternalPreprocessorSource() { }
diff --git a/lib/Tooling/CompilationDatabase.cpp b/lib/Tooling/CompilationDatabase.cpp
index 8fc4a1fe5b..6f95bf01f6 100644
--- a/lib/Tooling/CompilationDatabase.cpp
+++ b/lib/Tooling/CompilationDatabase.cpp
@@ -32,6 +32,8 @@
 using namespace clang;
 using namespace tooling;
 
+LLVM_INSTANTIATE_REGISTRY(CompilationDatabasePluginRegistry)
+
 CompilationDatabase::~CompilationDatabase() {}
 
 std::unique_ptr<CompilationDatabase>