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//===-- LiveRange.h - Store info about a live range --------------*- C++ -*--=//
//
// Implements a live range using a ValueSet. A LiveRange is a simple set
// of Values.
//
// Since the Value pointed by a use is the same as of its def, it is sufficient
// to keep only defs in a LiveRange.
//
//===----------------------------------------------------------------------===//
#ifndef LIVE_RANGE_H
#define LIVE_RANGE_H
#include "llvm/Analysis/LiveVar/ValueSet.h"
#include "llvm/Value.h"
class RegClass;
class IGNode;
class Type;
class LiveRange : public ValueSet {
RegClass *MyRegClass; // register classs (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
// mustSaveAcrossCalls - whether this LR must be saved accross calls
// ***TODO REMOVE this
//
bool mustSaveAcrossCalls;
// SuggestedColor - if this LR has a suggested color, can it be
// really alloated? 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 0 Whether this live range has a spill offset
//
bool HasSpillOffset;
// The spill cost of this live range. Calculated using loop depth of
// each reference to each Value in the live range
//
unsigned SpillCost;
public:
LiveRange() {
Color = SuggestedColor = -1; // not yet colored
mustSpill = mustSaveAcrossCalls = 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; }
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() { 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 markForSaveAcrossCalls() { mustSaveAcrossCalls = true; }
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;
}
};
#endif
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