Move inliner pass header file.

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@37664 91177308-0d34-0410-b5e6-96231b3b80d8

include/llvm/Transforms/IPO/InlinerPass.h

@@ -0,0 +1,64 @@
+//===- InlinerPass.h - Code common to all inliners --------------*- C++ -*-===//
+//
+//                     The LLVM Compiler Infrastructure
+//
+// This file was developed by the LLVM research group and is distributed under
+// the University of Illinois Open Source License. See LICENSE.TXT for details.
+//
+//===----------------------------------------------------------------------===//
+//
+// This file defines a simple policy-based bottom-up inliner.  This file
+// implements all of the boring mechanics of the bottom-up inlining, while the
+// subclass determines WHAT to inline, which is the much more interesting
+// component.
+//
+//===----------------------------------------------------------------------===//
+
+#ifndef INLINER_H
+#define INLINER_H
+
+#include "llvm/CallGraphSCCPass.h"
+
+namespace llvm {
+  class CallSite;
+
+/// Inliner - This class contains all of the helper code which is used to
+/// perform the inlining operations that does not depend on the policy.
+///
+struct Inliner : public CallGraphSCCPass {
+  Inliner(const void *ID);
+
+  /// getAnalysisUsage - For this class, we declare that we require and preserve
+  /// the call graph.  If the derived class implements this method, it should
+  /// always explicitly call the implementation here.
+  virtual void getAnalysisUsage(AnalysisUsage &Info) const;
+
+  // Main run interface method, this implements the interface required by the
+  // Pass class.
+  virtual bool runOnSCC(const std::vector<CallGraphNode *> &SCC);
+
+  // doFinalization - Remove now-dead linkonce functions at the end of
+  // processing to avoid breaking the SCC traversal.
+  virtual bool doFinalization(CallGraph &CG);
+
+
+  /// This method returns the value specified by the -inline-threshold value,
+  /// specified on the command line.  This is typically not directly needed.
+  ///
+  unsigned getInlineThreshold() const { return InlineThreshold; }
+
+  /// getInlineCost - This method must be implemented by the subclass to
+  /// determine the cost of inlining the specified call site.  If the cost
+  /// returned is greater than the current inline threshold, the call site is
+  /// not inlined.
+  ///
+  virtual int getInlineCost(CallSite CS) = 0;
+
+private:
+  // InlineThreshold - Cache the value here for easy access.
+  unsigned InlineThreshold;
+};
+
+} // End llvm namespace
+
+#endif