1 files changed, 87 insertions, 0 deletions
diff --git a/lib/CodeGen/RegAlloc/LiveRangeInfo.h b/lib/CodeGen/RegAlloc/LiveRangeInfo.h
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+++ b/lib/CodeGen/RegAlloc/LiveRangeInfo.h
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+/* Title:   LiveRangeInfo.h
+   Author:  Ruchira Sasanka
+   Date:    Jun 30, 01
+   Purpose: 
+
+   This file constructs and keeps the LiveRang map which contains all the live
+   ranges used in a method.
+
+   Assumptions: 
+
+   All variables (llvm Values) are defined before they are used. However, a 
+   constant may not be defined in the machine instruction stream if it can be
+   used as an immediate value within a machine instruction. However, register
+   allocation does not have to worry about immediate constants since they
+   do not require registers.
+
+   Since an llvm Value has a list of uses associated, it is sufficient to
+   record only the defs in a Live Range.
+
+*/
+
+
+#ifndef LIVE_RANGE_INFO_H
+#define LIVE_RANGE_INFO_H
+
+
+#include "llvm/Type.h"
+#include "llvm/Method.h"
+#include "llvm/CodeGen/MachineInstr.h"
+
+#include "llvm/Analysis/LiveVar/LiveVarSet.h"
+
+#include "llvm/CodeGen/IGNode.h"
+#include "llvm/CodeGen/LiveRange.h"
+#include "llvm/CodeGen/RegClass.h"
+
+/*
+ #ifndef size_type 
+ #define size_type (unsigned int)
+ #endif
+*/
+
+
+typedef hash_map <const Value *,  LiveRange *, hashFuncValue> LiveRangeMapType;
+
+
+class LiveRangeInfo 
+{
+
+private:
+
+  const Method *const Meth;         // Method for which live range info is held
+
+  LiveRangeMapType  LiveRangeMap;   // A map from Value * to LiveRange * 
+                                    // created by constructLiveRanges
+
+  void unionAndUpdateLRs(LiveRange *L1, LiveRange *L2);
+
+  void addInterference(const Instruction *const Inst, 
+		       const LiveVarSet *const LVSet);
+  
+
+public:
+  
+  LiveRangeInfo(const Method *const M);
+
+  void constructLiveRanges();
+
+  inline const LiveRangeMapType *const getLiveRangeMap() const 
+    { return &LiveRangeMap; }
+
+  inline LiveRange *getLiveRangeForValue( const Value *const Val) 
+    { return LiveRangeMap[ Val ]; }
+
+
+
+
+  void coalesceLRs();  
+
+  void printLiveRanges();
+
+};
+
+
+
+
+#endif