[arcmt] Introduce new '-ccc-arcmt-migrate <path>' ARC migration driver option.

This is a new mode of migration, where we avoid modifying the original files but
we emit temporary files instead.

<path> will be used to keep migration process metadata. Currently the temporary files
that are produced are put in the system's temp directory but we can put them
in the <path> if is necessary.

Also introduce new ARC migration functions in libclang whose only purpose,
currently, is to accept <path> and provide pairs of original file/transformed file
to map from the originals to the files after transformations are applied.

Finally introduce the c-arcmt-test utility that exercises the new libclang functions,
update arcmt-test, and add tests for the whole process.

rdar://9735086.

llvm-svn: 134844

1 files changed, 20 insertions, 5 deletions

diff --git a/clang/lib/ARCMigrate/ARCMTActions.cpp b/clang/lib/ARCMigrate/ARCMTActions.cpp
index 7de62d289ce..345c7452420 100644
--- a/clang/lib/ARCMigrate/ARCMTActions.cpp
+++ b/clang/lib/ARCMigrate/ARCMTActions.cpp
@@ -28,11 +28,26 @@ bool CheckAction::BeginInvocation(CompilerInstance &CI) {
 CheckAction::CheckAction(FrontendAction *WrappedAction)
   : WrapperFrontendAction(WrappedAction) {}
 
-bool TransformationAction::BeginInvocation(CompilerInstance &CI) {
-  return !arcmt::applyTransformations(CI.getInvocation(), getCurrentFile(),
-                                  getCurrentFileKind(),
-                                  CI.getDiagnostics().getClient());
+bool ModifyAction::BeginInvocation(CompilerInstance &CI) {
+  return !arcmt::applyTransformations(CI.getInvocation(),
+                                      getCurrentFile(), getCurrentFileKind(),
+                                      CI.getDiagnostics().getClient());
 }
 
-TransformationAction::TransformationAction(FrontendAction *WrappedAction)
+ModifyAction::ModifyAction(FrontendAction *WrappedAction)
   : WrapperFrontendAction(WrappedAction) {}
+
+bool MigrateAction::BeginInvocation(CompilerInstance &CI) {
+  return !arcmt::migrateWithTemporaryFiles(CI.getInvocation(),
+                                           getCurrentFile(),
+                                           getCurrentFileKind(),
+                                           CI.getDiagnostics().getClient(),
+                                           MigrateDir);
+}
+
+MigrateAction::MigrateAction(FrontendAction *WrappedAction,
+                             llvm::StringRef migrateDir)
+  : WrapperFrontendAction(WrappedAction), MigrateDir(migrateDir) {
+  if (MigrateDir.empty())
+    MigrateDir = "."; // user current directory if none is given.
+}