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//===-- LiveRange.h - Store info about a live range -------------*- 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.
//
//===----------------------------------------------------------------------===//
//
// Implements a live range using a SetVector of Value *s. We keep only
// defs in a LiveRange.
//
//===----------------------------------------------------------------------===//
#ifndef LIVERANGE_H
#define LIVERANGE_H
#include "llvm/Value.h"
#include "Support/SetVector.h"
#include <iostream>
namespace llvm {
class RegClass;
class IGNode;
class LiveRange {
public:
typedef SetVector<const Value *> ValueContainerType;
typedef ValueContainerType::iterator iterator;
typedef ValueContainerType::const_iterator const_iterator;
private:
ValueContainerType MyValues; // Values in this LiveRange
RegClass *MyRegClass; // register class (e.g., int, FP) for this LR
/// doesSpanAcrossCalls - Does this live range span across calls?
/// This information is used by graph coloring algo to avoid allocating
/// volatile colors to live ranges that span across calls (since they have to
/// be saved/restored)
///
bool doesSpanAcrossCalls;
IGNode *UserIGNode; // IGNode which uses this LR
int Color; // color assigned to this live range
bool mustSpill; // whether this LR must be spilt
/// SuggestedColor - if this LR has a suggested color, can it
/// really be allocated? A suggested color cannot be allocated when the
/// suggested color is volatile and when there are call
/// interferences.
///
int SuggestedColor; // The suggested color for this LR
/// CanUseSuggestedCol - It is possible that a suggested color for
/// this live range is not available before graph coloring (e.g., it
/// can be allocated to another live range which interferes with
/// this)
///
bool CanUseSuggestedCol;
/// SpilledStackOffsetFromFP - If this LR is spilled, its stack
/// offset from *FP*. The spilled offsets must always be relative to
/// the FP.
///
int SpilledStackOffsetFromFP;
/// HasSpillOffset - True iff this live range has a spill offset.
///
bool HasSpillOffset;
/// SpillCost - The spill cost of this live range. Calculated using loop depth
/// of each reference to each Value in the live range.
///
unsigned SpillCost;
public:
iterator begin() { return MyValues.begin(); }
const_iterator begin() const { return MyValues.begin(); }
iterator end() { return MyValues.end(); }
const_iterator end() const { return MyValues.end(); }
bool insert(const Value *&X) { return MyValues.insert (X); }
void insert(iterator b, iterator e) { MyValues.insert (b, e); }
LiveRange() {
Color = SuggestedColor = -1; // not yet colored
mustSpill = false;
MyRegClass = 0;
UserIGNode = 0;
doesSpanAcrossCalls = false;
CanUseSuggestedCol = true;
HasSpillOffset = false;
SpillCost = 0;
}
void setRegClass(RegClass *RC) { MyRegClass = RC; }
RegClass *getRegClass() const { assert(MyRegClass); return MyRegClass; }
unsigned getRegClassID() const;
bool hasColor() const { return Color != -1; }
unsigned getColor() const { assert(Color != -1); return (unsigned)Color; }
void setColor(unsigned Col) { Color = (int)Col; }
inline void setCallInterference() {
doesSpanAcrossCalls = 1;
}
inline void clearCallInterference() {
doesSpanAcrossCalls = 0;
}
inline bool isCallInterference() const {
return doesSpanAcrossCalls == 1;
}
inline void markForSpill() { mustSpill = true; }
inline bool isMarkedForSpill() const { return mustSpill; }
inline void setSpillOffFromFP(int StackOffset) {
assert(mustSpill && "This LR is not spilled");
SpilledStackOffsetFromFP = StackOffset;
HasSpillOffset = true;
}
inline void modifySpillOffFromFP(int StackOffset) {
assert(mustSpill && "This LR is not spilled");
SpilledStackOffsetFromFP = StackOffset;
HasSpillOffset = true;
}
inline bool hasSpillOffset() const {
return HasSpillOffset;
}
inline int getSpillOffFromFP() const {
assert(HasSpillOffset && "This LR is not spilled");
return SpilledStackOffsetFromFP;
}
inline void setUserIGNode(IGNode *IGN) {
assert(!UserIGNode); UserIGNode = IGN;
}
// getUserIGNode - NULL if the user is not allocated
inline IGNode *getUserIGNode() const { return UserIGNode; }
inline const Type *getType() const {
return (*begin())->getType(); // set's don't have a front
}
inline void setSuggestedColor(int Col) {
if (SuggestedColor == -1)
SuggestedColor = Col;
}
inline unsigned getSuggestedColor() const {
assert(SuggestedColor != -1); // only a valid color is obtained
return (unsigned)SuggestedColor;
}
inline bool hasSuggestedColor() const {
return SuggestedColor != -1;
}
inline bool isSuggestedColorUsable() const {
assert(hasSuggestedColor() && "No suggested color");
return CanUseSuggestedCol;
}
inline void setSuggestedColorUsable(bool val) {
assert(hasSuggestedColor() && "No suggested color");
CanUseSuggestedCol = val;
}
inline void addSpillCost(unsigned cost) {
SpillCost += cost;
}
inline unsigned getSpillCost() const {
return SpillCost;
}
};
static inline std::ostream &operator << (std::ostream &os, const LiveRange &lr) {
os << "LiveRange@" << (void *)(&lr);
return os;
};
} // End llvm namespace
#endif
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