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Added more comments. Added code to destructor in MethodLiveVarInfo to delete

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LiveVarSet caches.


git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@1435 91177308-0d34-0410-b5e6-96231b3b80d8
This commit is contained in:
Ruchira Sasanka
2001-12-08 21:05:27 +00:00
parent b720a8bc1d
commit 789cebb908
4 changed files with 158 additions and 44 deletions
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lib/Analysis/LiveVar/FunctionLiveVarInfo.cpp
+55 -11
View File
@@ -14,7 +14,7 @@
#include "Support/PostOrderIterator.h"
/************************** Constructor/Destructor ***************************/
//************************** Constructor/Destructor ***************************
MethodLiveVarInfo::MethodLiveVarInfo(const Method *const M) : Meth(M),
@@ -28,21 +28,45 @@ 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;
}
// 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 -------------------------------
// ************************* support functions ********************************
//-----------------------------------------------------------------------------
// constructs BBLiveVars and init Def and In sets
//-----------------------------------------------------------------------------
void MethodLiveVarInfo::constructBBs()
{
unsigned int POId = 0; // Reverse Depth-first Order ID
@@ -85,8 +109,9 @@ void MethodLiveVarInfo::constructBBs()
}
// do one backward pass over the CFG
//-----------------------------------------------------------------------------
// do one backward pass over the CFG (for iterative analysis)
//-----------------------------------------------------------------------------
bool MethodLiveVarInfo::doSingleBackwardPass()
{
bool ResultFlow, NeedAnotherIteration = false;
@@ -127,8 +152,9 @@ bool MethodLiveVarInfo::doSingleBackwardPass()
//-----------------------------------------------------------------------------
// performs live var anal for a method
//-----------------------------------------------------------------------------
void MethodLiveVarInfo::analyze()
{
// Don't analyze the same method twice!
@@ -157,8 +183,8 @@ void MethodLiveVarInfo::analyze()
/* 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
@@ -167,8 +193,11 @@ void MethodLiveVarInfo::analyze()
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)
@@ -178,12 +207,21 @@ MethodLiveVarInfo::getLiveVarSetBeforeMInst(const MachineInstr *const MInst,
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)
@@ -199,6 +237,12 @@ MethodLiveVarInfo::getLiveVarSetAfterMInst(const MachineInstr *const MInst,
}
//-----------------------------------------------------------------------------
// 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();