[PM] Create a separate library for high-level pass management code.

This will provide the analogous replacements for the PassManagerBuilder
and other code long term. This code is extracted from the opt tool
currently, and I plan to extend it as I build up support for using the
new pass manager in Clang and other places.

Mailing this out for review in part to let folks comment on the terrible names
here. A brief word about why I chose the names I did.

The library is called "Passes" to try and make it clear that it is a high-level
utility and where *all* of the passes come together and are registered in
a common library. I didn't want it to be *limited* to a registry though, the
registry is just one component.

The class is a "PassBuilder" but this name I'm less happy with. It doesn't
build passes in any traditional sense and isn't a Builder-style API at all. The
class is a PassRegisterer or PassAdder, but neither of those really make a lot
of sense. This class is responsible for constructing passes for registry in an
analysis manager or for population of a pass pipeline. If anyone has a better
name, I would love to hear it. The other candidate I looked at was
PassRegistrar, but that doesn't really fit either. There is no register of all
the passes in use, and so I think continuing the "registry" analog outside of
the registry of pass *names* and *types* is a mistake. The objects themselves
are just objects with the new pass manager.

Differential Revision: http://reviews.llvm.org/D8054

llvm-svn: 231556

1 files changed, 1 insertions, 1 deletions

diff --git a/llvm/lib/LLVMBuild.txt b/llvm/lib/LLVMBuild.txt
index ad5b22b914e..bc2448da0ed 100644
--- a/llvm/lib/LLVMBuild.txt
+++ b/llvm/lib/LLVMBuild.txt
@@ -16,7 +16,7 @@
 ;===------------------------------------------------------------------------===;
 
 [common]
-subdirectories = Analysis AsmParser Bitcode CodeGen DebugInfo ExecutionEngine LineEditor Linker IR IRReader LTO MC Object Option ProfileData Support TableGen Target Transforms
+subdirectories = Analysis AsmParser Bitcode CodeGen DebugInfo ExecutionEngine LineEditor Linker IR IRReader LTO MC Object Option Passes ProfileData Support TableGen Target Transforms
 
 [component_0]
 type = Group