forked from OSchip/llvm-project
Added more comments. Added code to destructor in MethodLiveVarInfo to delete
LiveVarSet caches. llvm-svn: 1435
This commit is contained in:
Ruchira Sasanka
parent
565a5c423d
commit
4552ee447a
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@ -1,11 +1,12 @@
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#include "llvm/Analysis/LiveVar/BBLiveVar.h"
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#include "llvm/Analysis/LiveVar/MethodLiveVarInfo.h"
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#include "llvm/CodeGen/MachineInstr.h"
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#include "../../Target/Sparc/SparcInternals.h" // TODO: FIXME!! Only for PHI defn
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#include "../../Target/Sparc/SparcInternals.h" // Only for PHI defn
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/********************* Implementation **************************************/
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//-----------------------------------------------------------------------------
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// Constructor
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//-----------------------------------------------------------------------------
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BBLiveVar::BBLiveVar( const BasicBlock *const baseBB, unsigned int RdfoId)
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: BaseBB(baseBB), DefSet(), InSet(),
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OutSet(), PhiArgMap() {
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@ -14,10 +15,13 @@ BBLiveVar::BBLiveVar( const BasicBlock *const baseBB, unsigned int RdfoId)
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POId = RdfoId;
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}
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//-----------------------------------------------------------------------------
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// caluculates def and use sets for each BB
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// There are two passes over operands of a machine instruction. This is
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// because, we can have instructions like V = V + 1, since we no longer
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// assume single definition.
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//-----------------------------------------------------------------------------
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void BBLiveVar::calcDefUseSets()
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{
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@ -56,7 +60,7 @@ void BBLiveVar::calcDefUseSets()
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// iterate over MI operands to find uses
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for (MachineInstr::val_const_op_iterator OpI(MInst); !OpI.done() ; ++OpI) {
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for (MachineInstr::val_const_op_iterator OpI(MInst); !OpI.done() ; ++OpI) {
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const Value *Op = *OpI;
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if ( ((Op)->getType())->isLabelType() )
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@ -106,10 +110,12 @@ void BBLiveVar::calcDefUseSets()
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} // for all machine instructions
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}
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// To add an operand wichi is a def
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//-----------------------------------------------------------------------------
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// To add an operand which is a def
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//-----------------------------------------------------------------------------
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void BBLiveVar::addDef(const Value *Op)
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{
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DefSet.add( Op ); // operand is a def - so add to def set
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@ -121,8 +127,10 @@ void BBLiveVar::addDef(const Value *Op)
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}
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}
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// To add an operand which is a use
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//-----------------------------------------------------------------------------
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// To add an operand which is a use
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//-----------------------------------------------------------------------------
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void BBLiveVar::addUse(const Value *Op)
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{
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InSet.add( Op ); // An operand is a use - so add to use set
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@ -136,6 +144,10 @@ void BBLiveVar::addUse(const Value *Op)
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}
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//-----------------------------------------------------------------------------
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// Applies the transfer function to a basic block to produce the InSet using
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// the outset.
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//-----------------------------------------------------------------------------
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bool BBLiveVar::applyTransferFunc() // calculates the InSet in terms of OutSet
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{
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@ -153,8 +165,9 @@ bool BBLiveVar::applyTransferFunc() // calculates the InSet in terms of OutSet
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}
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//-----------------------------------------------------------------------------
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// calculates Out set using In sets of the predecessors
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//-----------------------------------------------------------------------------
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bool BBLiveVar::setPropagate( LiveVarSet *const OutSet,
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const LiveVarSet *const InSet,
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const BasicBlock *const PredBB) {
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@ -180,9 +193,9 @@ bool BBLiveVar::setPropagate( LiveVarSet *const OutSet,
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}
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//-----------------------------------------------------------------------------
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// propogates in set to OutSets of PREDECESSORs
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//-----------------------------------------------------------------------------
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bool BBLiveVar::applyFlowFunc(BBToBBLiveVarMapType LVMap)
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{
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@ -14,7 +14,7 @@
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#include "Support/PostOrderIterator.h"
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/************************** Constructor/Destructor ***************************/
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//************************** Constructor/Destructor ***************************
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MethodLiveVarInfo::MethodLiveVarInfo(const Method *const M) : Meth(M),
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@ -28,21 +28,45 @@ MethodLiveVarInfo::MethodLiveVarInfo(const Method *const M) : Meth(M),
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MethodLiveVarInfo:: ~MethodLiveVarInfo()
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{
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// hash map iterator
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// First delete all BBLiveVar objects created in constructBBs(). A new object
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// of type BBLiveVa is created for every BasicBlock in the method
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// hash map iterator for BB2BBLVMap
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//
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BBToBBLiveVarMapType::iterator HMI = BB2BBLVMap.begin();
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for( ; HMI != BB2BBLVMap.end() ; HMI ++ ) {
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if( (*HMI).first ) // delete all LiveVarSets in BB2BBLVMap
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if( (*HMI).first ) // delete all BBLiveVar in BB2BBLVMap
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delete (*HMI).second;
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}
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// Then delete all objects of type LiveVarSet created in calcLiveVarSetsForBB
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// and entered into MInst2LVSetBI and MInst2LVSetAI (these are caches
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// to return LiveVarSet's before/after a machine instruction quickly). It
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// is sufficient to free up all LiveVarSet using only one cache since
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// both caches refer to the same sets
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// hash map iterator for MInst2LVSetBI
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//
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MInstToLiveVarSetMapType::iterator MI = MInst2LVSetBI.begin();
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for( ; MI != MInst2LVSetBI.end() ; MI ++ ) {
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if( (*MI).first ) // delete all LiveVarSets in MInst2LVSetBI
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delete (*MI).second;
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}
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}
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// -------------------------- support functions -------------------------------
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// ************************* support functions ********************************
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//-----------------------------------------------------------------------------
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// constructs BBLiveVars and init Def and In sets
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//-----------------------------------------------------------------------------
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void MethodLiveVarInfo::constructBBs()
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{
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unsigned int POId = 0; // Reverse Depth-first Order ID
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@ -85,8 +109,9 @@ void MethodLiveVarInfo::constructBBs()
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}
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// do one backward pass over the CFG
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//-----------------------------------------------------------------------------
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// do one backward pass over the CFG (for iterative analysis)
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//-----------------------------------------------------------------------------
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bool MethodLiveVarInfo::doSingleBackwardPass()
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{
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bool ResultFlow, NeedAnotherIteration = false;
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@ -127,8 +152,9 @@ bool MethodLiveVarInfo::doSingleBackwardPass()
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//-----------------------------------------------------------------------------
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// performs live var anal for a method
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//-----------------------------------------------------------------------------
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void MethodLiveVarInfo::analyze()
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{
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// Don't analyze the same method twice!
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@ -157,8 +183,8 @@ void MethodLiveVarInfo::analyze()
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/* Thsese functions will give the LiveVar info for any machine instruction in
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//-----------------------------------------------------------------------------
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/* Following functions will give the LiveVar info for any machine instr in
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a method. It should be called after a call to analyze().
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Thsese functions calucluates live var info for all the machine instrs in a
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@ -167,8 +193,11 @@ void MethodLiveVarInfo::analyze()
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block. Also, the arguments to this method does not require specific
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iterators.
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*/
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//-----------------------------------------------------------------------------
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//-----------------------------------------------------------------------------
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// Gives live variable information before a machine instruction
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//-----------------------------------------------------------------------------
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const LiveVarSet *
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MethodLiveVarInfo::getLiveVarSetBeforeMInst(const MachineInstr *const MInst,
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const BasicBlock *const CurBB)
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@ -178,12 +207,21 @@ MethodLiveVarInfo::getLiveVarSetBeforeMInst(const MachineInstr *const MInst,
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if( LVSet ) return LVSet; // if found, just return the set
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else {
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calcLiveVarSetsForBB( CurBB ); // else, calc for all instrs in BB
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/*if( ! MInst2LVSetBI[ MInst ] ) {
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cerr << "\nFor BB "; printValue( CurBB);
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cerr << "\nRequested LVSet for inst: " << *MInst;
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}*/
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assert( MInst2LVSetBI[ MInst ] );
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return MInst2LVSetBI[ MInst ];
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}
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}
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//-----------------------------------------------------------------------------
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// Gives live variable information after a machine instruction
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//-----------------------------------------------------------------------------
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const LiveVarSet *
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MethodLiveVarInfo::getLiveVarSetAfterMInst(const MachineInstr *const MInst,
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const BasicBlock *const CurBB)
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@ -199,6 +237,12 @@ MethodLiveVarInfo::getLiveVarSetAfterMInst(const MachineInstr *const MInst,
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}
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//-----------------------------------------------------------------------------
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// This method calculates the live variable information for all the
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// instructions in a basic block and enter the newly constructed live
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// variable sets into a the caches ( MInst2LVSetAI, MInst2LVSetBI)
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//-----------------------------------------------------------------------------
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void MethodLiveVarInfo::calcLiveVarSetsForBB(const BasicBlock *const BB)
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{
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const MachineCodeForBasicBlock& MIVec = BB->getMachineInstrVec();
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