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135 lines
3.7 KiB
C++
135 lines
3.7 KiB
C++
/* Title: LiveRangeInfo.h -*- C++ -*-
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Author: Ruchira Sasanka
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Date: Jun 30, 01
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Purpose:
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This file contains the class LiveRangeInfo which constructs and keeps
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the LiveRangMap which contains all the live ranges used in a method.
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Assumptions:
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All variables (llvm Values) are defined before they are used. However, a
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constant may not be defined in the machine instruction stream if it can be
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used as an immediate value within a machine instruction. However, register
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allocation does not have to worry about immediate constants since they
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do not require registers.
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Since an llvm Value has a list of uses associated, it is sufficient to
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record only the defs in a Live Range.
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*/
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#ifndef LIVE_RANGE_INFO_H
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#define LIVE_RANGE_INFO_H
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#include "llvm/Type.h"
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#include "llvm/Method.h"
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#include "llvm/CodeGen/MachineInstr.h"
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#include "llvm/Analysis/LiveVar/LiveVarSet.h"
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#include "llvm/CodeGen/IGNode.h"
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#include "llvm/CodeGen/LiveRange.h"
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#include "llvm/CodeGen/RegClass.h"
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typedef std::hash_map<const Value*, LiveRange*> LiveRangeMapType;
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typedef std::vector<const MachineInstr*> CallRetInstrListType;
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//----------------------------------------------------------------------------
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// Class LiveRangeInfo
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//
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// Constructs and keeps the LiveRangMap which contains all the live
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// ranges used in a method. Also contain methods to coalesce live ranges.
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//----------------------------------------------------------------------------
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class LiveRangeInfo
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{
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private:
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const Method *const Meth; // Method for which live range info is held
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LiveRangeMapType LiveRangeMap; // A map from Value * to LiveRange * to
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// record all live ranges in a method
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// created by constructLiveRanges
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const TargetMachine& TM; // target machine description
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std::vector<RegClass *> & RegClassList;// vector containing register classess
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const MachineRegInfo& MRI; // machine reg info
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CallRetInstrListType CallRetInstrList; // a list of all call/ret instrs
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//------------ Private methods (see LiveRangeInfo.cpp for description)-------
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void unionAndUpdateLRs(LiveRange *L1, LiveRange *L2);
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void addInterference(const Instruction *const Inst,
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const LiveVarSet *const LVSet);
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void suggestRegs4CallRets();
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const Method* getMethod() { return Meth; }
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public:
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LiveRangeInfo(const Method *const M,
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const TargetMachine& tm,
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std::vector<RegClass *> & RCList);
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// Destructor to destroy all LiveRanges in the LiveRange Map
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~LiveRangeInfo();
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// Main entry point for live range construction
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//
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void constructLiveRanges();
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// This method is used to add a live range created elsewhere (e.g.,
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// in machine specific code) to the common live range map
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//
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inline void addLRToMap(const Value *Val, LiveRange *LR) {
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assert( Val && LR && "Val/LR is NULL!\n");
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assert( (! LiveRangeMap[ Val ]) && "LR already set in map");
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LiveRangeMap[ Val ] = LR;
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}
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// return the common live range map for this method
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//
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inline const LiveRangeMapType *const getLiveRangeMap() const
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{ return &LiveRangeMap; }
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// Method sed to get the corresponding live range of a Value
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//
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inline LiveRange *getLiveRangeForValue( const Value *const Val)
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{ return LiveRangeMap[ Val ]; }
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// Method used to get the Call and Return instruction list
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//
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inline CallRetInstrListType &getCallRetInstrList() {
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return CallRetInstrList;
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}
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// Method for coalescing live ranges. Called only after interference info
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// is calculated.
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//
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void coalesceLRs();
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// debugging method to print the live ranges
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//
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void printLiveRanges();
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};
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#endif
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