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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 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 LIVERANGE_H
#define LIVERANGE_H
#include "llvm/Value.h"
#include "llvm/CodeGen/ValueSet.h"
class RegClass;
class IGNode;
class LiveRange : public ValueSet {
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
/// 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; }
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 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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