1 files changed, 150 insertions, 0 deletions
diff --git a/include/llvm/Analysis/LoopPass.h b/include/llvm/Analysis/LoopPass.h
new file mode 100644
index 0000000..ca41e51
--- /dev/null
+++ b/include/llvm/Analysis/LoopPass.h
@@ -0,0 +1,150 @@
+//===- LoopPass.h - LoopPass class ----------------------------------------===//
+//
+//                     The LLVM Compiler Infrastructure
+//
+// This file is distributed under the University of Illinois Open Source
+// License. See LICENSE.TXT for details.
+//
+//===----------------------------------------------------------------------===//
+//
+// This file defines LoopPass class. All loop optimization
+// and transformation passes are derived from LoopPass.
+//
+//===----------------------------------------------------------------------===//
+
+#ifndef LLVM_LOOP_PASS_H
+#define LLVM_LOOP_PASS_H
+
+#include "llvm/Analysis/LoopInfo.h"
+#include "llvm/Pass.h"
+#include "llvm/PassManagers.h"
+#include "llvm/Function.h"
+
+namespace llvm {
+
+class LPPassManager;
+class Function;
+class PMStack;
+
+class LoopPass : public Pass {
+public:
+  explicit LoopPass(intptr_t pid) : Pass(pid) {}
+  explicit LoopPass(void *pid) : Pass(pid) {}
+
+  // runOnLoop - This method should be implemented by the subclass to perform
+  // whatever action is necessary for the specified Loop.
+  virtual bool runOnLoop(Loop *L, LPPassManager &LPM) = 0;
+  virtual bool runOnFunctionBody(Function &F, LPPassManager &LPM) {
+    return false;
+  }
+
+  // Initialization and finalization hooks.
+  virtual bool doInitialization(Loop *L, LPPassManager &LPM) {
+    return false;
+  }
+
+  // Finalization hook does not supply Loop because at this time
+  // loop nest is completely different.
+  virtual bool doFinalization() { return false; }
+
+  // Check if this pass is suitable for the current LPPassManager, if
+  // available. This pass P is not suitable for a LPPassManager if P
+  // is not preserving higher level analysis info used by other
+  // LPPassManager passes. In such case, pop LPPassManager from the
+  // stack. This will force assignPassManager() to create new
+  // LPPassManger as expected.
+  void preparePassManager(PMStack &PMS);
+
+  /// Assign pass manager to manager this pass
+  virtual void assignPassManager(PMStack &PMS,
+                                 PassManagerType PMT = PMT_LoopPassManager);
+
+  ///  Return what kind of Pass Manager can manage this pass.
+  virtual PassManagerType getPotentialPassManagerType() const {
+    return PMT_LoopPassManager;
+  }
+
+  //===--------------------------------------------------------------------===//
+  /// SimpleAnalysis - Provides simple interface to update analysis info
+  /// maintained by various passes. Note, if required this interface can
+  /// be extracted into a separate abstract class but it would require
+  /// additional use of multiple inheritance in Pass class hierarchy, something
+  /// we are trying to avoid.
+
+  /// Each loop pass can override these simple analysis hooks to update
+  /// desired analysis information.
+  /// cloneBasicBlockAnalysis - Clone analysis info associated with basic block.
+  virtual void cloneBasicBlockAnalysis(BasicBlock *F, BasicBlock *T, Loop *L) {}
+
+  /// deletekAnalysisValue - Delete analysis info associated with value V.
+  virtual void deleteAnalysisValue(Value *V, Loop *L) {}
+};
+
+class LPPassManager : public FunctionPass, public PMDataManager {
+public:
+  static char ID;
+  explicit LPPassManager(int Depth);
+
+  /// run - Execute all of the passes scheduled for execution.  Keep track of
+  /// whether any of the passes modifies the module, and if so, return true.
+  bool runOnFunction(Function &F);
+
+  /// Pass Manager itself does not invalidate any analysis info.
+  // LPPassManager needs LoopInfo.
+  void getAnalysisUsage(AnalysisUsage &Info) const;
+
+  virtual const char *getPassName() const {
+    return "Loop Pass Manager";
+  }
+
+  /// Print passes managed by this manager
+  void dumpPassStructure(unsigned Offset);
+
+  Pass *getContainedPass(unsigned N) {
+    assert(N < PassVector.size() && "Pass number out of range!");
+    Pass *FP = static_cast<Pass *>(PassVector[N]);
+    return FP;
+  }
+
+  virtual PassManagerType getPassManagerType() const {
+    return PMT_LoopPassManager;
+  }
+
+public:
+  // Delete loop from the loop queue and loop nest (LoopInfo).
+  void deleteLoopFromQueue(Loop *L);
+
+  // Insert loop into the loop nest(LoopInfo) and loop queue(LQ).
+  void insertLoop(Loop *L, Loop *ParentLoop);
+
+  // Reoptimize this loop. LPPassManager will re-insert this loop into the
+  // queue. This allows LoopPass to change loop nest for the loop. This
+  // utility may send LPPassManager into infinite loops so use caution.
+  void redoLoop(Loop *L);
+
+  //===--------------------------------------------------------------------===//
+  /// SimpleAnalysis - Provides simple interface to update analysis info
+  /// maintained by various passes. Note, if required this interface can
+  /// be extracted into a separate abstract class but it would require
+  /// additional use of multiple inheritance in Pass class hierarchy, something
+  /// we are trying to avoid.
+
+  /// cloneBasicBlockSimpleAnalysis - Invoke cloneBasicBlockAnalysis hook for
+  /// all passes that implement simple analysis interface.
+  void cloneBasicBlockSimpleAnalysis(BasicBlock *From, BasicBlock *To, Loop *L);
+
+  /// deleteSimpleAnalysisValue - Invoke deleteAnalysisValue hook for all passes
+  /// that implement simple analysis interface.
+  void deleteSimpleAnalysisValue(Value *V, Loop *L);
+
+private:
+  std::deque<Loop *> LQ;
+  bool skipThisLoop;
+  bool redoThisLoop;
+  LoopInfo *LI;
+  Loop *CurrentLoop;
+};
+
+} // End llvm namespace
+
+#endif