Add skeleton profileinfoloader pass. This will be enhanced to actually LOAD

a profile tommorow.  :)


git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@11318 91177308-0d34-0410-b5e6-96231b3b80d8

lib/Analysis/ProfileInfoLoaderPass.cpp

@@ -0,0 +1,58 @@
+//===- ProfileInfoLoaderPass.cpp - LLVM Pass to load profile info ---------===//
+// 
+//                     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 implements a concrete implementation of profiling information that
+// loads the information from a profile dump file.
+//
+//===----------------------------------------------------------------------===//
+
+#include "llvm/Pass.h"
+#include "llvm/Analysis/ProfileInfo.h"
+#include "llvm/Analysis/ProfileInfoLoader.h"
+using namespace llvm;
+
+namespace {
+  class LoaderPass : public Pass, public ProfileInfo {
+    std::string Filename;
+  public:
+    LoaderPass(const std::string &filename = "llvmprof.out")
+      : Filename(filename) {}
+
+    virtual void getAnalysisUsage(AnalysisUsage &AU) const {
+      AU.setPreservesAll();
+    }
+
+    virtual const char *getPassName() const {
+      return "Profiling information loader";
+    }
+
+    /// run - Load the profile information from the specified file.
+    virtual bool run(Module &M);
+
+    unsigned getExecutionCount(BasicBlock *BB) { return 0; }
+  };
+ 
+  RegisterOpt<LoaderPass>
+  X("profile-loader", "Load profile information from llvmprof.out");
+
+  RegisterAnalysisGroup<ProfileInfo, LoaderPass> Y;
+}  // End of anonymous namespace
+
+
+/// createProfileLoaderPass - This function returns a Pass that loads the
+/// profiling information for the module from the specified filename, making it
+/// available to the optimizers.
+Pass *llvm::createProfileLoaderPass(const std::string &Filename) {
+  return new LoaderPass(Filename);
+}
+
+bool LoaderPass::run(Module &M) {
+
+  return false;
+}