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156 lines
3.8 KiB
C++
156 lines
3.8 KiB
C++
/* Title: LiveRange.h
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Author: Ruchira Sasanka
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Date: July 25, 01
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Purpose: To keep info about a live range.
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Asuumptions:
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Since the Value pointed by a use is the same as of its def, it is sufficient
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to keep only defs in a LiveRange.
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*/
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#ifndef LIVE_RANGE_H
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#define LIVE_RANGE_H
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#include "llvm/Analysis/LiveVar/ValueSet.h"
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#include "llvm/Type.h"
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class RegClass;
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class IGNode;
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class LiveRange : public ValueSet
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{
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private:
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RegClass *MyRegClass; // register classs (e.g., int, FP) for this LR
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// a list of call instructions that interferes with this live range
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//vector<const Instruction *> CallInterferenceList;
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// does this live range span across calls?
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// This information is used by graph
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// coloring algo to avoid allocating volatile colors to live ranges
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// that span across calls (since they have to be saved/restored)
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bool doesSpanAcrossCalls;
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IGNode *UserIGNode; // IGNode which uses this LR
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int Color; // color assigned to this live range
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bool mustSpill; // whether this LR must be spilt
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// whether this LR must be saved accross calls ***TODO REMOVE this
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bool mustSaveAcrossCalls;
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// bool mustLoadFromStack; // must load from stack at start of method
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int SuggestedColor; // The suggested color for this LR
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// if this LR has a suggested color, can it be really alloated?
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// A suggested color cannot be allocated when the suggested color is
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// volatile and when there are call interferences.
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bool CanUseSuggestedCol;
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public:
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~LiveRange() {} // empty destructor
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void setRegClass(RegClass *const RC)
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{ MyRegClass = RC; }
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inline RegClass *const getRegClass() const
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{ assert(MyRegClass); return MyRegClass; }
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inline bool hasColor() const
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{ return Color != -1; }
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inline unsigned int getColor() const
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{ assert( Color != -1); return (unsigned) Color ; }
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inline void setColor(unsigned int Col)
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{ Color = (int) Col ; }
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inline void setCallInterference() {
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doesSpanAcrossCalls = 1;
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}
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inline bool isCallInterference() const {
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return (doesSpanAcrossCalls == 1);
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}
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inline void markForSpill() { mustSpill = true; }
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inline void markForSaveAcrossCalls() { mustSaveAcrossCalls = true; }
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// inline void markForLoadFromStack() { mustLoadFromStack = true;
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inline void setUserIGNode( IGNode *const IGN)
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{ assert( !UserIGNode); UserIGNode = IGN; }
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inline IGNode * getUserIGNode() const
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{ return UserIGNode; } // NULL if the user is not allocated
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inline Type::PrimitiveID getTypeID() const {
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const Value *val = *begin();
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assert(val && "Can't find type - Live range is empty" );
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return (val->getType())->getPrimitiveID();
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}
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inline void setSuggestedColor(int Col) {
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//assert( (SuggestedColor == -1) && "Changing an already suggested color");
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if(SuggestedColor == -1 )
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SuggestedColor = Col;
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else if (DEBUG_RA)
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cerr << "Already has a suggested color " << Col << endl;
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}
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inline unsigned getSuggestedColor() const {
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assert( SuggestedColor != -1); // only a valid color is obtained
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return (unsigned) SuggestedColor;
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}
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inline bool hasSuggestedColor() const {
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return ( SuggestedColor > -1);
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}
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inline bool isSuggestedColorUsable() const {
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assert( hasSuggestedColor() && "No suggested color");
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return CanUseSuggestedCol;
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}
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inline void setSuggestedColorUsable(const bool val) {
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assert( hasSuggestedColor() && "No suggested color");
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CanUseSuggestedCol = val;
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}
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inline LiveRange() : ValueSet() /* , CallInterferenceList() */
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{
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Color = SuggestedColor = -1; // not yet colored
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mustSpill = mustSaveAcrossCalls = false;
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MyRegClass = NULL;
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UserIGNode = NULL;
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doesSpanAcrossCalls = false;
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CanUseSuggestedCol = true;
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}
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};
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#endif
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