2 Author: Ruchira Sasanka
4 Purpose: To keep info about a live range.
7 Since the Value pointed by a use is the same as of its def, it is sufficient
8 to keep only defs in a LiveRange.
14 #include "llvm/Analysis/LiveVar/ValueSet.h"
15 #include "llvm/Type.h"
24 class LiveRange : public ValueSet
28 RegClass *MyRegClass; // register classs (e.g., int, FP) for this LR
30 // a list of call instructions that interferes with this live range
31 //vector<const Instruction *> CallInterferenceList;
33 // does this live range span across calls?
34 // This information is used by graph
35 // coloring algo to avoid allocating volatile colors to live ranges
36 // that span across calls (since they have to be saved/restored)
38 bool doesSpanAcrossCalls;
40 IGNode *UserIGNode; // IGNode which uses this LR
41 int Color; // color assigned to this live range
42 bool mustSpill; // whether this LR must be spilt
44 // whether this LR must be saved accross calls ***TODO REMOVE this
45 bool mustSaveAcrossCalls;
47 // bool mustLoadFromStack; // must load from stack at start of method
50 int SuggestedColor; // The suggested color for this LR
52 // if this LR has a suggested color, can it be really alloated?
53 // A suggested color cannot be allocated when the suggested color is
54 // volatile and when there are call interferences.
56 bool CanUseSuggestedCol;
61 ~LiveRange() {} // empty destructor
63 void setRegClass(RegClass *const RC)
66 inline RegClass *const getRegClass() const
67 { assert(MyRegClass); return MyRegClass; }
69 inline bool hasColor() const
70 { return Color != -1; }
72 inline unsigned int getColor() const
73 { assert( Color != -1); return (unsigned) Color ; }
75 inline void setColor(unsigned int Col)
76 { Color = (int) Col ; }
79 inline void setCallInterference() {
80 doesSpanAcrossCalls = 1;
84 inline bool isCallInterference() const {
85 return (doesSpanAcrossCalls == 1);
89 inline void markForSpill() { mustSpill = true; }
91 inline void markForSaveAcrossCalls() { mustSaveAcrossCalls = true; }
93 // inline void markForLoadFromStack() { mustLoadFromStack = true;
96 inline void setUserIGNode( IGNode *const IGN)
97 { assert( !UserIGNode); UserIGNode = IGN; }
99 inline IGNode * getUserIGNode() const
100 { return UserIGNode; } // NULL if the user is not allocated
102 inline Type::PrimitiveID getTypeID() const {
103 const Value *val = *begin();
104 assert(val && "Can't find type - Live range is empty" );
105 return (val->getType())->getPrimitiveID();
109 inline void setSuggestedColor(int Col) {
110 //assert( (SuggestedColor == -1) && "Changing an already suggested color");
112 if(SuggestedColor == -1 )
113 SuggestedColor = Col;
115 cerr << "Already has a suggested color " << Col << endl;
118 inline unsigned getSuggestedColor() const {
119 assert( SuggestedColor != -1); // only a valid color is obtained
120 return (unsigned) SuggestedColor;
123 inline bool hasSuggestedColor() const {
124 return ( SuggestedColor > -1);
127 inline bool isSuggestedColorUsable() const {
128 assert( hasSuggestedColor() && "No suggested color");
129 return CanUseSuggestedCol;
132 inline void setSuggestedColorUsable(const bool val) {
133 assert( hasSuggestedColor() && "No suggested color");
134 CanUseSuggestedCol = val;
138 inline LiveRange() : ValueSet() /* , CallInterferenceList() */
140 Color = SuggestedColor = -1; // not yet colored
141 mustSpill = mustSaveAcrossCalls = false;
144 doesSpanAcrossCalls = false;
145 CanUseSuggestedCol = true;