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116 lines
3.7 KiB
C++
116 lines
3.7 KiB
C++
//===-- LiveRangeInfo.h - Track all LiveRanges for a Function ----*- C++ -*-==//
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//
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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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//
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// Assumptions:
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//
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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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//
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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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//===----------------------------------------------------------------------===//
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#ifndef LIVE_RANGE_INFO_H
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#define LIVE_RANGE_INFO_H
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#include "llvm/CodeGen/ValueSet.h"
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#include "Support/hash_map"
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class LiveRange;
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class MachineInstr;
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class RegClass;
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class TargetRegInfo;
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class TargetMachine;
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class Value;
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class Function;
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class Instruction;
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typedef hash_map<const Value*, LiveRange*> LiveRangeMapType;
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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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const Function *const Meth; // Func 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 TargetRegInfo& MRI; // machine reg info
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std::vector<MachineInstr*> CallRetInstrList; // a list of all call/ret instrs
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//------------ Private methods (see LiveRangeInfo.cpp for description)-------
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LiveRange* createNewLiveRange (const Value* Def,
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bool isCC = false);
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LiveRange* createOrAddToLiveRange (const Value* Def,
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bool isCC = false);
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void unionAndUpdateLRs (LiveRange *L1,
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LiveRange *L2);
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void addInterference (const Instruction *Inst,
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const ValueSet *LVSet);
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void suggestRegs4CallRets ();
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const Function *getMethod () const { return Meth; }
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public:
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LiveRangeInfo(const Function *F,
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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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// return the common live range map for this method
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//
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inline const LiveRangeMapType *getLiveRangeMap() const
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{ return &LiveRangeMap; }
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// Method used to get the live range containing a Value.
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// This may return NULL if no live range exists for a Value (eg, some consts)
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inline LiveRange *getLiveRangeForValue(const Value *Val) {
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return LiveRangeMap[Val];
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}
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inline const LiveRange *getLiveRangeForValue(const Value *Val) const {
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LiveRangeMapType::const_iterator I = LiveRangeMap.find(Val);
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return I->second;
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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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