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