Change ConstantFoldConstantExpression to accept a null

[oota-llvm.git] / include / llvm / Analysis / IntervalPartition.h

diff --git a/include/llvm/Analysis/IntervalPartition.h b/include/llvm/Analysis/IntervalPartition.h
index 16b3c9c457fc7c3ba7a6191e62bf92271709162d..feae6d82f82f5a3cfc10d891321f74ed3d92ee9a 100644 (file)
--- a/include/llvm/Analysis/IntervalPartition.h
+++ b/include/llvm/Analysis/IntervalPartition.h
@@ -1,7 +1,14 @@
-//===- IntervalPartition.h - Interval partition Calculation ------*- C++ -*--=//
+//===- IntervalPartition.h - Interval partition Calculation -----*- C++ -*-===//
 //
-// This file contains the declaration of the cfg::IntervalPartition class, which
-// calculates and represents the interval partition of a method, or a
+//                     The LLVM Compiler Infrastructure
+//
+// This file is distributed under the University of Illinois Open Source
+// License. See LICENSE.TXT for details.
+//
+//===----------------------------------------------------------------------===//
+//
+// This file contains the declaration of the IntervalPartition class, which
+// calculates and represents the interval partition of a function, or a
 // preexisting interval partition.
 //
 // In this way, the interval partition may be used to reduce a flow graph down
@@ -18,31 +25,33 @@
 
 #include "llvm/Analysis/Interval.h"
 #include "llvm/Pass.h"
+#include <map>
 
-namespace cfg {
+namespace llvm {
 
 //===----------------------------------------------------------------------===//
 //
 // IntervalPartition - This class builds and holds an "interval partition" for
-// a method.  This partition divides the control flow graph into a set of
+// a function.  This partition divides the control flow graph into a set of
 // maximal intervals, as defined with the properties above.  Intuitively, a
 // BasicBlock is a (possibly nonexistent) loop with a "tail" of non looping
 // nodes following it.
 //
-class IntervalPartition : public MethodPass, public std::vector<Interval*> {
+class IntervalPartition : public FunctionPass {
   typedef std::map<BasicBlock*, Interval*> IntervalMapTy;
   IntervalMapTy IntervalMap;
 
   typedef std::vector<Interval*> IntervalListTy;
   Interval *RootInterval;
+  std::vector<Interval*> Intervals;
 
 public:
-  static AnalysisID ID;    // We are an analysis, we must have an ID
+  static char ID; // Pass identification, replacement for typeid
 
-  IntervalPartition(AnalysisID AID) : RootInterval(0) { assert(AID == ID); }
+  IntervalPartition() : FunctionPass(&ID), RootInterval(0) {}
 
-  // run - Calculate the interval partition for this method
-  virtual bool runOnMethod(Method *M);
+  // run - Calculate the interval partition for this function
+  virtual bool runOnFunction(Function &F);
 
   // IntervalPartition ctor - Build a reduced interval partition from an
   // existing interval graph.  This takes an additional boolean parameter to
@@ -50,16 +59,19 @@ public:
   //
   IntervalPartition(IntervalPartition &I, bool);
 
-  // Destructor - Free memory
-  ~IntervalPartition() { destroy(); }
+  // print - Show contents in human readable format...
+  virtual void print(std::ostream &O, const Module* = 0) const;
+  void print(std::ostream *O, const Module* M = 0) const {
+    if (O) print(*O, M);
+  }
 
   // getRootInterval() - Return the root interval that contains the starting
-  // block of the method.
+  // block of the function.
   inline Interval *getRootInterval() { return RootInterval; }
 
   // isDegeneratePartition() - Returns true if the interval partition contains
   // a single interval, and thus cannot be simplified anymore.
-  bool isDegeneratePartition() { return size() == 1; }
+  bool isDegeneratePartition() { return Intervals.size() == 1; }
 
   // TODO: isIrreducible - look for triangle graph.
 
@@ -69,17 +81,18 @@ public:
     return I != IntervalMap.end() ? I->second : 0;
   }
 
-  // getAnalysisUsageInfo - Implement the Pass API
-  virtual void getAnalysisUsageInfo(AnalysisSet &Required,
-                                    AnalysisSet &Destroyed,
-                                    AnalysisSet &Provided) {
-    Provided.push_back(ID);
+  // getAnalysisUsage - Implement the Pass API
+  virtual void getAnalysisUsage(AnalysisUsage &AU) const {
+    AU.setPreservesAll();
   }
 
-private:
-  // destroy - Reset state back to before method was analyzed
-  void destroy();
+  // Interface to Intervals vector...
+  const std::vector<Interval*> &getIntervals() const { return Intervals; }
 
+  // releaseMemory - Reset state back to before function was analyzed
+  void releaseMemory();
+
+private:
   // addIntervalToPartition - Add an interval to the internal list of intervals,
   // and then add mappings from all of the basic blocks in the interval to the
   // interval itself (in the IntervalMap).
@@ -88,12 +101,12 @@ private:
 
   // updatePredecessors - Interval generation only sets the successor fields of
   // the interval data structures.  After interval generation is complete,
-  // run through all of the intervals and propogate successor info as
+  // run through all of the intervals and propagate successor info as
   // predecessor info.
   //
   void updatePredecessors(Interval *Int);
 };
 
-}    // End namespace cfg
+} // End llvm namespace
 
 #endif