Add Loop Pass Manager.

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@34487 91177308-0d34-0410-b5e6-96231b3b80d8

lib/Analysis/LoopPass.cpp

@@ -0,0 +1,69 @@
+//===- LoopPass.cpp - Loop Pass and Loop Pass Manager ---------------------===//
+//
+//                     The LLVM Compiler Infrastructure
+//
+// This file was developed by Devang Patel and is distributed under
+// the University of Illinois Open Source License. See LICENSE.TXT for details.
+//
+//===----------------------------------------------------------------------===//
+//
+// This file implements LoopPass and LPPassManager. All loop optimization
+// and transformation passes are derived from LoopPass. LPPassManager is
+// responsible for managing LoopPasses.
+//
+//===----------------------------------------------------------------------===//
+
+#include "llvm/Analysis/LoopPass.h"
+using namespace llvm;
+
+//===----------------------------------------------------------------------===//
+// LPPassManager
+//
+/// LPPassManager manages FPPassManagers and CalLGraphSCCPasses.
+
+/// run - Execute all of the passes scheduled for execution.  Keep track of
+/// whether any of the passes modifies the function, and if so, return true.
+bool LPPassManager::runOnFunction(Function &F) {
+  LoopInfo &LI = getAnalysis<LoopInfo>();
+  bool Changed = false;
+
+  std::string Msg1 = "Executing Pass '";
+  std::string Msg3 = "' Made Modification '";
+
+  // Walk Loops
+  for (LoopInfo::iterator I = LI.begin(), E = LI.end(); I != E; ++I) {
+
+    Loop *L  = *I;
+    // Run all passes on current SCC
+    for (unsigned Index = 0; Index < getNumContainedPasses(); ++Index) {  
+
+      Pass *P = getContainedPass(Index);
+      AnalysisUsage AnUsage;
+      P->getAnalysisUsage(AnUsage);
+
+      std::string Msg2 = "' on Loop ...\n'";
+      dumpPassInfo(P, Msg1, Msg2);
+      dumpAnalysisSetInfo("Required", P, AnUsage.getRequiredSet());
+
+      initializeAnalysisImpl(P);
+
+      StartPassTimer(P);
+      LoopPass *LP = dynamic_cast<LoopPass *>(P);
+      assert (LP && "Invalid LPPassManager member");
+      LP->runOnLoop(*L, *this);
+      StopPassTimer(P);
+
+      if (Changed)
+	dumpPassInfo(P, Msg3, Msg2);
+      dumpAnalysisSetInfo("Preserved", P, AnUsage.getPreservedSet());
+      
+      removeNotPreservedAnalysis(P);
+      recordAvailableAnalysis(P);
+      removeDeadPasses(P, Msg2);
+    }
+  }
+
+  return Changed;
+}
+
+