mirror of
https://github.com/c64scene-ar/llvm-6502.git
synced 2024-07-19 19:30:10 +00:00
bae47e5691
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@7341 91177308-0d34-0410-b5e6-96231b3b80d8
111 lines
3.5 KiB
C++
111 lines
3.5 KiB
C++
//===-- LiveRangeInfo.h - Track all LiveRanges for a Function ----*- C++ -*-==//
|
|
//
|
|
// This file contains the class LiveRangeInfo which constructs and keeps
|
|
// the LiveRangMap 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/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 LiveRangMap 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
|
|
|
|
std::vector<RegClass *> & RegClassList;// vector containing register classess
|
|
|
|
const TargetRegInfo& MRI; // machine reg info
|
|
|
|
std::vector<MachineInstr*> CallRetInstrList; // a list of all call/ret instrs
|
|
|
|
|
|
//------------ Private methods (see LiveRangeInfo.cpp for description)-------
|
|
|
|
LiveRange* createNewLiveRange (const Value* Def,
|
|
bool isCC = false);
|
|
|
|
LiveRange* createOrAddToLiveRange (const Value* Def,
|
|
bool isCC = false);
|
|
|
|
void unionAndUpdateLRs (LiveRange *L1,
|
|
LiveRange *L2);
|
|
|
|
void addInterference (const Instruction *Inst,
|
|
const ValueSet *LVSet);
|
|
|
|
void suggestRegs4CallRets ();
|
|
|
|
const Function *getMethod () const { return Meth; }
|
|
|
|
public:
|
|
|
|
LiveRangeInfo(const Function *F,
|
|
const TargetMachine& tm,
|
|
std::vector<RegClass *> & RCList);
|
|
|
|
|
|
// Destructor to destroy all LiveRanges in the LiveRange 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
|
|
{ return &LiveRangeMap; }
|
|
|
|
// Method sed to get the corresponding live range of a Value
|
|
//
|
|
inline LiveRange *getLiveRangeForValue( const Value *Val)
|
|
{ return LiveRangeMap[Val]; }
|
|
|
|
// Method for coalescing live ranges. Called only after interference info
|
|
// is calculated.
|
|
//
|
|
void coalesceLRs();
|
|
|
|
// debugging method to print the live ranges
|
|
//
|
|
void printLiveRanges();
|
|
};
|
|
|
|
#endif
|