Raise the ARCMT functionality in Clang into proper FrontendActions.

These are somewhat special in that they wrap any other FrontendAction,
running various ARC transformations or checks prior to the standard
action's run. To implement them easily, this extends FrontendAction to
have a WrapperFrontendAction utility class which forwards all calls by
default to an inner action setup at construction time. This is then
subclassed to override the specific behavior needed by the different
ARCMT tools.

Finally, FrontendTool is taught how to create these wrapper actions from
the existing flags and options structures.

The result is that clangFrontend no longer depends on clangARCMigrate.
This is very important, as clangARCMigrate *heavily* depends on
clangFrontend. Fundamentally ARCMigrate is at the same layer as
a library like Rewrite, sitting firmly on top of the Frontend, but tied
together with the FrontendTool when building the clang binary itself.

git-svn-id: https://llvm.org/svn/llvm-project/cfe/trunk@133161 91177308-0d34-0410-b5e6-96231b3b80d8

3 files changed, 38 insertions, 30 deletions

diff --git a/lib/Frontend/CMakeLists.txt b/lib/Frontend/CMakeLists.txt
index 5565b7b4a8..7dcbebff39 100644
--- a/lib/Frontend/CMakeLists.txt
+++ b/lib/Frontend/CMakeLists.txt
@@ -1,5 +1,4 @@
 set( LLVM_USED_LIBS
-  clangARCMigrate
   clangAST
   clangBasic
   clangDriver
diff --git a/lib/Frontend/CompilerInstance.cpp b/lib/Frontend/CompilerInstance.cpp
index b05c24a985..38fcfe3c47 100644
--- a/lib/Frontend/CompilerInstance.cpp
+++ b/lib/Frontend/CompilerInstance.cpp
@@ -26,7 +26,6 @@
 #include "clang/Frontend/TextDiagnosticPrinter.h"
 #include "clang/Frontend/VerifyDiagnosticsClient.h"
 #include "clang/Frontend/Utils.h"
-#include "clang/ARCMigrate/ARCMT.h"
 #include "clang/Serialization/ASTReader.h"
 #include "clang/Sema/CodeCompleteConsumer.h"
 #include "llvm/Support/FileSystem.h"
@@ -597,34 +596,6 @@ bool CompilerInstance::ExecuteAction(FrontendAction &Act) {
     if (hasSourceManager())
       getSourceManager().clearIDTables();
 
-    switch (getFrontendOpts().ARCMTAction) {
-    default:
-      break;
-
-    case FrontendOptions::ARCMT_Check:
-      if (arcmt::checkForManualIssues(getInvocation(), InFile,
-                                      getFrontendOpts().Inputs[i].first,
-                                      getDiagnostics().getClient()))
-        continue;
-      // We only want to see warnings reported from arcmt::checkForManualIssues.
-      getDiagnostics().setIgnoreAllWarnings(true);
-      break;
-
-    case FrontendOptions::ARCMT_Modify:
-      if (arcmt::applyTransformations(getInvocation(), InFile,
-                                      getFrontendOpts().Inputs[i].first,
-                                      getDiagnostics().getClient()))
-        continue;
-      break;
-
-    case FrontendOptions::ARCMT_ModifyInMemory:
-      if (arcmt::applyTransformationsInMemory(getInvocation(), InFile,
-                                              getFrontendOpts().Inputs[i].first,
-                                              getDiagnostics().getClient()))
-        continue;
-      break;
-    }
-
     if (Act.BeginSourceFile(*this, InFile, getFrontendOpts().Inputs[i].first)) {
       Act.Execute();
       Act.EndSourceFile();
diff --git a/lib/Frontend/FrontendAction.cpp b/lib/Frontend/FrontendAction.cpp
index 42da44c2c7..0024818ad8 100644
--- a/lib/Frontend/FrontendAction.cpp
+++ b/lib/Frontend/FrontendAction.cpp
@@ -381,3 +381,41 @@ PreprocessorFrontendAction::CreateASTConsumer(CompilerInstance &CI,
                                               llvm::StringRef InFile) {
   llvm_unreachable("Invalid CreateASTConsumer on preprocessor action!");
 }
+
+ASTConsumer *WrapperFrontendAction::CreateASTConsumer(CompilerInstance &CI,
+                                                      llvm::StringRef InFile) {
+  return WrappedAction->CreateASTConsumer(CI, InFile);
+}
+bool WrapperFrontendAction::BeginSourceFileAction(CompilerInstance &CI,
+                                                  llvm::StringRef Filename) {
+  return WrappedAction->BeginSourceFileAction(CI, Filename);
+}
+void WrapperFrontendAction::ExecuteAction() {
+  WrappedAction->ExecuteAction();
+}
+void WrapperFrontendAction::EndSourceFileAction() {
+  WrappedAction->EndSourceFileAction();
+}
+
+bool WrapperFrontendAction::usesPreprocessorOnly() const {
+  return WrappedAction->usesPreprocessorOnly();
+}
+bool WrapperFrontendAction::usesCompleteTranslationUnit() {
+  return WrappedAction->usesCompleteTranslationUnit();
+}
+bool WrapperFrontendAction::hasPCHSupport() const {
+  return WrappedAction->hasPCHSupport();
+}
+bool WrapperFrontendAction::hasASTFileSupport() const {
+  return WrappedAction->hasASTFileSupport();
+}
+bool WrapperFrontendAction::hasIRSupport() const {
+  return WrappedAction->hasIRSupport();
+}
+bool WrapperFrontendAction::hasCodeCompletionSupport() const {
+  return WrappedAction->hasCodeCompletionSupport();
+}
+
+WrapperFrontendAction::WrapperFrontendAction(FrontendAction *WrappedAction)
+  : WrappedAction(WrappedAction) {}
+