Move the old pass manager infrastructure into a legacy namespace and

give the files a legacy prefix in the right directory. Use forwarding
headers in the old locations to paper over the name change for most
clients during the transitional period.

No functionality changed here! This is just clearing some space to
reduce renaming churn later on with a new system.

Even when the new stuff starts to go in, it is going to be hidden behind
a flag and off-by-default as it is still WIP and under development.

This patch is specifically designed so that very little out-of-tree code
has to change. I'm going to work as hard as I can to keep that the case.
Only direct forward declarations of the PassManager class are impacted
by this change.

llvm-svn: 194324

2 files changed, 9 insertions, 2 deletions

diff --git a/llvm/unittests/IR/CMakeLists.txt b/llvm/unittests/IR/CMakeLists.txt
index c53043ef80e..1ab8e384c8a 100644
--- a/llvm/unittests/IR/CMakeLists.txt
+++ b/llvm/unittests/IR/CMakeLists.txt
@@ -10,9 +10,9 @@ set(IRSources
   DominatorTreeTest.cpp
   IRBuilderTest.cpp
   InstructionsTest.cpp
+  LegacyPassManagerTest.cpp
   MDBuilderTest.cpp
   MetadataTest.cpp
-  PassManagerTest.cpp
   PatternMatch.cpp
   TypeBuilderTest.cpp
   TypesTest.cpp
diff --git a/llvm/unittests/IR/PassManagerTest.cpp b/llvm/unittests/IR/LegacyPassManagerTest.cpp
index 48514fc5686..11841bdeac0 100644
--- a/llvm/unittests/IR/PassManagerTest.cpp
+++ b/llvm/unittests/IR/LegacyPassManagerTest.cpp
@@ -1,4 +1,4 @@
-//===- llvm/unittest/IR/PassManager.cpp - PassManager unit tests ----------===//
+//===- llvm/unittest/IR/LegacyPassManager.cpp - Legacy PassManager tests --===//
 //
 //                     The LLVM Compiler Infrastructure
 //
@@ -6,6 +6,13 @@
 // License. See LICENSE.TXT for details.
 //
 //===----------------------------------------------------------------------===//
+//
+// This unit test exercises the legacy pass manager infrastructure. We use the
+// old names as well to ensure that the source-level compatibility wrapper
+// works for out-of-tree code that expects to include llvm/PassManager.h and
+// subclass the core pass classes.
+//
+//===----------------------------------------------------------------------===//
 
 #include "llvm/PassManager.h"
 #include "llvm/ADT/SmallVector.h"