-/* 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
-*/
-
+//===-- LiveRangeInfo.h - Track all LiveRanges for a Function ----*- C++ -*-==//
+//
+// 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 contains the class LiveRangeInfo which constructs and keeps
+// the LiveRangeMap 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 LIVERANGEINFO_H
+#define LIVERANGEINFO_H
+
+#include "llvm/CodeGen/ValueSet.h"
+#include "Support/hash_map"
+
+class LiveRange;
+class MachineInstr;
+class RegClass;
+class TargetRegInfo;
+class TargetMachine;
+class Value;
+class Function;
+class Instruction;
+
+typedef hash_map<const Value*, LiveRange*> LiveRangeMapType;
+
+//----------------------------------------------------------------------------
+// Class LiveRangeInfo
+//
+// Constructs and keeps the LiveRangeMap which contains all the live
+// ranges used in a method. Also contain methods to coalesce live ranges.
+//----------------------------------------------------------------------------
+
+class LiveRangeInfo {
+ const Function *const Meth; // Func for which live range info is held
+ LiveRangeMapType LiveRangeMap; // A map from Value * to LiveRange * to
+ // record all live ranges in a method
+ // created by constructLiveRanges
+
+ const TargetMachine& TM; // target machine description
-typedef hash_map <const Value *, LiveRange *, hashFuncValue> LiveRangeMapType;
-typedef vector <const MachineInstr *> CallRetInstrListType;
+ std::vector<RegClass *> & RegClassList;// vector containing register classess
-class LiveRangeInfo
-{
+ const TargetRegInfo& MRI; // machine reg info
-private:
+ std::vector<MachineInstr*> CallRetInstrList; // a list of all call/ret instrs
- const Method *const Meth; // Method for which live range info is held
- LiveRangeMapType LiveRangeMap; // A map from Value * to LiveRange *
- // created by constructLiveRanges
+ //------------ Private methods (see LiveRangeInfo.cpp for description)-------
- const TargetMachine& TM; // target machine description
- vector<RegClass *> & RegClassList;// a vector containing register classess
- const MachineRegInfo& MRI; // machine reg info
+ LiveRange* createNewLiveRange (const Value* Def,
+ bool isCC = false);
- CallRetInstrListType CallRetInstrList; // a list of all call/ret instrs
+ LiveRange* createOrAddToLiveRange (const Value* Def,
+ bool isCC = false);
- void unionAndUpdateLRs(LiveRange *L1, LiveRange *L2);
+ void unionAndUpdateLRs (LiveRange *L1,
+ LiveRange *L2);
- void addInterference(const Instruction *const Inst,
- const LiveVarSet *const LVSet);
+ void addInterference (const Instruction *Inst,
+ const ValueSet *LVSet);
- void suggestRegs4CallRets();
+ void suggestRegs4CallRets ();
+
+ const Function *getMethod () const { return Meth; }
public:
- LiveRangeInfo(const Method *const M,
+ LiveRangeInfo(const Function *F,
const TargetMachine& tm,
- vector<RegClass *> & RCList);
+ std::vector<RegClass *> & RCList);
- void constructLiveRanges();
- inline void addLRToMap(const Value *Val, LiveRange *LR) {
- assert( Val && LR && "Val/LR is NULL!\n");
- assert( (! LiveRangeMap[ Val ]) && "LR already set in map");
- LiveRangeMap[ Val ] = LR;
- }
-
+ /// Destructor to destroy all LiveRanges in the LiveRange Map
+ ///
+ ~LiveRangeInfo();
- inline const LiveRangeMapType *const getLiveRangeMap() const
+ // Main entry point for live range construction
+ //
+ void constructLiveRanges();
+
+ /// return the common live range map for this method
+ ///
+ inline const LiveRangeMapType *getLiveRangeMap() const
{ return &LiveRangeMap; }
- inline LiveRange *getLiveRangeForValue( const Value *const Val)
- { return LiveRangeMap[ Val ]; }
-
- inline CallRetInstrListType &getCallRetInstrList() {
- return CallRetInstrList;
+ /// Method used to get the live range containing a Value.
+ /// This may return NULL if no live range exists for a Value (eg, some consts)
+ ///
+ inline LiveRange *getLiveRangeForValue(const Value *Val) {
+ return LiveRangeMap[Val];
+ }
+ inline const LiveRange *getLiveRangeForValue(const Value *Val) const {
+ LiveRangeMapType::const_iterator I = LiveRangeMap.find(Val);
+ return I->second;
}
-
-
+ /// Method for coalescing live ranges. Called only after interference info
+ /// is calculated.
+ ///
void coalesceLRs();
+ /// debugging method to print the live ranges
+ ///
void printLiveRanges();
-
};
-
-
-
#endif
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