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llvm-mirror/lib/Target/SparcV9/RegAlloc/LiveRangeInfo.h

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//===-- 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
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// 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.
//
//===----------------------------------------------------------------------===//
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#ifndef LIVERANGEINFO_H
#define LIVERANGEINFO_H
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#include "llvm/CodeGen/ValueSet.h"
#include "llvm/ADT/hash_map"
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namespace llvm {
class V9LiveRange;
class MachineInstr;
class RegClass;
class SparcV9RegInfo;
class TargetMachine;
class Value;
class Function;
class Instruction;
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typedef hash_map<const Value*, V9LiveRange*> LiveRangeMapType;
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//----------------------------------------------------------------------------
// 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 V9LiveRange * to
// record all live ranges in a method
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// created by constructLiveRanges
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const TargetMachine& TM; // target machine description
std::vector<RegClass *> & RegClassList;// vector containing register classess
const SparcV9RegInfo& 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)-------
V9LiveRange* createNewLiveRange (const Value* Def,
bool isCC = false);
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V9LiveRange* createOrAddToLiveRange (const Value* Def,
bool isCC = false);
void unionAndUpdateLRs (V9LiveRange *L1,
V9LiveRange *L2);
void suggestRegs4CallRets ();
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public:
LiveRangeInfo(const Function *F,
const TargetMachine& tm,
std::vector<RegClass *> & RCList);
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/// Destructor to destroy all LiveRanges in the V9LiveRange Map
///
~LiveRangeInfo();
// Main entry point for live range construction
//
void constructLiveRanges();
/// return the common live range map for this method
///
inline const LiveRangeMapType *getLiveRangeMap() const
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{ return &LiveRangeMap; }
/// 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 V9LiveRange *getLiveRangeForValue(const Value *Val) {
return LiveRangeMap[Val];
}
inline const V9LiveRange *getLiveRangeForValue(const Value *Val) const {
LiveRangeMapType::const_iterator I = LiveRangeMap.find(Val);
return I->second;
}
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/// Method for coalescing live ranges. Called only after interference info
/// is calculated.
///
void coalesceLRs();
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/// debugging method to print the live ranges
///
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void printLiveRanges();
};
} // End llvm namespace
#endif