* Add a stub to FunctionPass so that subclasses can declare that they do not

modify the CFG.  It currently does nothing, but will in the future.
* Changes to make the public PassManager.h be MUCH smaller, and devoid of
  implementation details.  Now PassManager is just a Pimpl class that wraps
  PassManagerT<Module>, but lib/VMCore/Pass.cpp is now the only class that
  has to #include PassManagerT.h


git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@2383 91177308-0d34-0410-b5e6-96231b3b80d8

include/llvm/PassManager.h

@@ -0,0 +1,36 @@
+//===- llvm/PassManager.h - Container for Passes -----------------*- C++ -*--=//
+//
+// This file defines the PassManager class.  This class is used to hold,
+// maintain, and optimize execution of Pass's.  The PassManager class ensures
+// that analysis results are available before a pass runs, and that Pass's are
+// destroyed when the PassManager is destroyed.
+//
+//===----------------------------------------------------------------------===//
+
+#ifndef LLVM_PASSMANAGER_H
+#define LLVM_PASSMANAGER_H
+
+class Pass;
+class Module;
+template<class UnitType> class PassManagerT;
+
+class PassManager {
+  PassManagerT<Module> *PM;    // This is a straightforward Pimpl class
+public:
+  PassManager();
+  ~PassManager();
+
+  // add - Add a pass to the queue of passes to run.  This passes ownership of
+  // the Pass to the PassManager.  When the PassManager is destroyed, the pass
+  // will be destroyed as well, so there is no need to delete the pass.  This
+  // implies that all passes MUST be allocated with 'new'.
+  //
+  void add(Pass *P);
+
+  // run - Execute all of the passes scheduled for execution.  Keep track of
+  // whether any of the functions modifies the program, and if so, return true.
+  //
+  bool run(Module *M);
+};
+
+#endif