//
//===----------------------------------------------------------------------===//
-#include "llvm/Analysis/LiveVar/FunctionLiveVarInfo.h"
-#include "BBLiveVar.h"
+#include "llvm/CodeGen/FunctionLiveVarInfo.h"
#include "llvm/CodeGen/MachineInstr.h"
+#include "llvm/CodeGen/MachineFunction.h"
+#include "llvm/Target/TargetMachine.h"
+#include "llvm/Target/TargetInstrInfo.h"
#include "llvm/Support/CFG.h"
#include "Support/PostOrderIterator.h"
#include "Support/SetOperations.h"
#include "Support/CommandLine.h"
-#include <iostream>
+#include "BBLiveVar.h"
-AnalysisID FunctionLiveVarInfo::ID(AnalysisID::create<FunctionLiveVarInfo>());
+static RegisterAnalysis<FunctionLiveVarInfo>
+X("livevar", "Live Variable Analysis");
LiveVarDebugLevel_t DEBUG_LV;
-static cl::Enum<LiveVarDebugLevel_t> DEBUG_LV_opt(DEBUG_LV, "dlivevar", cl::Hidden,
- "enable live-variable debugging information",
- clEnumValN(LV_DEBUG_None , "n", "disable debug output"),
- clEnumValN(LV_DEBUG_Normal , "y", "enable debug output"),
- clEnumValN(LV_DEBUG_Instr, "i", "print live-var sets before/after every machine instrn"),
- clEnumValN(LV_DEBUG_Verbose, "v", "print def, use sets for every instrn also"), 0);
+static cl::opt<LiveVarDebugLevel_t, true>
+DEBUG_LV_opt("dlivevar", cl::Hidden, cl::location(DEBUG_LV),
+ cl::desc("enable live-variable debugging information"),
+ cl::values(
+clEnumValN(LV_DEBUG_None , "n", "disable debug output"),
+clEnumValN(LV_DEBUG_Normal , "y", "enable debug output"),
+clEnumValN(LV_DEBUG_Instr, "i", "print live-var sets before/after "
+ "every machine instrn"),
+clEnumValN(LV_DEBUG_Verbose, "v", "print def, use sets for every instrn also"),
+ 0));
const ValueSet &FunctionLiveVarInfo::getOutSetOfBB(const BasicBlock *BB) const {
return BBLiveVar::GetFromBB(*BB)->getOutSet();
}
+ ValueSet &FunctionLiveVarInfo::getOutSetOfBB(const BasicBlock *BB) {
+ return BBLiveVar::GetFromBB(*BB)->getOutSet();
+}
// gets InSet of a BB
const ValueSet &FunctionLiveVarInfo::getInSetOfBB(const BasicBlock *BB) const {
return BBLiveVar::GetFromBB(*BB)->getInSet();
}
+ ValueSet &FunctionLiveVarInfo::getInSetOfBB(const BasicBlock *BB) {
+ return BBLiveVar::GetFromBB(*BB)->getInSet();
+}
//-----------------------------------------------------------------------------
// constructs BBLiveVars and init Def and In sets
//-----------------------------------------------------------------------------
-void FunctionLiveVarInfo::constructBBs(const Function *M) {
- unsigned int POId = 0; // Reverse Depth-first Order ID
-
- for(po_iterator<const Function*> BBI = po_begin(M), BBE = po_end(M);
- BBI != BBE; ++BBI, ++POId) {
- const BasicBlock &BB = **BBI; // get the current BB
+void FunctionLiveVarInfo::constructBBs(const Function *F) {
+ unsigned POId = 0; // Reverse Depth-first Order ID
+ std::map<const BasicBlock*, unsigned> PONumbering;
+ for (po_iterator<const Function*> BBI = po_begin(M), BBE = po_end(M);
+ BBI != BBE; ++BBI)
+ PONumbering[*BBI] = POId++;
+
+ MachineFunction &MF = MachineFunction::get(F);
+ for (MachineFunction::iterator I = MF.begin(), E = MF.end(); I != E; ++I) {
+ const BasicBlock &BB = *I->getBasicBlock(); // get the current BB
if (DEBUG_LV) std::cerr << " For BB " << RAV(BB) << ":\n";
- // create a new BBLiveVar
- BBLiveVar *LVBB = BBLiveVar::CreateOnBB(BB, POId);
+ BBLiveVar *LVBB;
+ std::map<const BasicBlock*, unsigned>::iterator POI = PONumbering.find(&BB);
+ if (POI != PONumbering.end()) {
+ // create a new BBLiveVar
+ LVBB = BBLiveVar::CreateOnBB(BB, *I, POId);
+ } else {
+ // The PO iterator does not discover unreachable blocks, but the random
+ // iterator later may access these blocks. We must make sure to
+ // initialize unreachable blocks as well. However, LV info is not correct
+ // for those blocks (they are not analyzed)
+ //
+ LVBB = BBLiveVar::CreateOnBB(BB, *I, ++POId);
+ }
if (DEBUG_LV)
LVBB->printAllSets();
}
-
- // Since the PO iterator does not discover unreachable blocks,
- // go over the random iterator and init those blocks as well.
- // However, LV info is not correct for those blocks (they are not
- // analyzed)
- //
- for (Function::const_iterator BBRI = M->begin(), BBRE = M->end();
- BBRI != BBRE; ++BBRI, ++POId)
- if (!BBLiveVar::GetFromBB(*BBRI)) // Not yet processed?
- BBLiveVar::CreateOnBB(*BBRI, POId);
}
M = 0;
// Then delete all objects of type ValueSet created in calcLiveVarSetsForBB
- // and entered into MInst2LVSetBI and MInst2LVSetAI (these are caches
- // to return ValueSet's before/after a machine instruction quickly). It
- // is sufficient to free up all ValueSet using only one cache since
- // both caches refer to the same sets
+ // and entered into MInst2LVSetBI and MInst2LVSetAI (these are caches
+ // to return ValueSet's before/after a machine instruction quickly).
+ // We do not need to free up ValueSets in MInst2LVSetAI because it holds
+ // pointers to the same sets as in MInst2LVSetBI (for all instructions
+ // except the last one in a BB) or in BBLiveVar (for the last instruction).
//
- for (std::map<const MachineInstr*, const ValueSet*>::iterator
+ for (hash_map<const MachineInstr*, ValueSet*>::iterator
MI = MInst2LVSetBI.begin(),
ME = MInst2LVSetBI.end(); MI != ME; ++MI)
delete MI->second; // delete all ValueSets in MInst2LVSetBI
//-----------------------------------------------------------------------------
const ValueSet &
-FunctionLiveVarInfo::getLiveVarSetBeforeMInst(const MachineInstr *MInst,
+FunctionLiveVarInfo::getLiveVarSetBeforeMInst(const MachineInstr *MI,
const BasicBlock *BB) {
- if (const ValueSet *LVSet = MInst2LVSetBI[MInst]) {
- return *LVSet; // if found, just return the set
- } else {
- calcLiveVarSetsForBB(BB); // else, calc for all instrs in BB
- return *MInst2LVSetBI[MInst];
+ ValueSet* &LVSet = MInst2LVSetBI[MI]; // ref. to map entry
+ if (LVSet == NULL && BB != NULL) { // if not found and BB provided
+ calcLiveVarSetsForBB(BB); // calc LVSet for all instrs in BB
+ assert(LVSet != NULL);
}
+ return *LVSet;
}
//-----------------------------------------------------------------------------
// Gives live variable information after a machine instruction
//-----------------------------------------------------------------------------
+
const ValueSet &
FunctionLiveVarInfo::getLiveVarSetAfterMInst(const MachineInstr *MI,
const BasicBlock *BB) {
- if (const ValueSet *LVSet = MInst2LVSetAI[MI]) {
- return *LVSet; // if found, just return the set
- } else {
- calcLiveVarSetsForBB(BB); // else, calc for all instrs in BB
- return *MInst2LVSetAI[MI];
+ ValueSet* &LVSet = MInst2LVSetAI[MI]; // ref. to map entry
+ if (LVSet == NULL && BB != NULL) { // if not found and BB provided
+ calcLiveVarSetsForBB(BB); // calc LVSet for all instrs in BB
+ assert(LVSet != NULL);
}
+ return *LVSet;
}
// This function applies a machine instr to a live var set (accepts OutSet) and
static void applyTranferFuncForMInst(ValueSet &LVS, const MachineInstr *MInst) {
for (MachineInstr::const_val_op_iterator OpI = MInst->begin(),
OpE = MInst->end(); OpI != OpE; ++OpI) {
- if (OpI.isDef()) // kill only if this operand is a def
- LVS.erase(*OpI); // this definition kills any uses
+ if (OpI.isDefOnly() || OpI.isDefAndUse()) // kill if this operand is a def
+ LVS.erase(*OpI); // this definition kills any uses
}
// do for implicit operands as well
for (unsigned i=0; i < MInst->getNumImplicitRefs(); ++i) {
- if (MInst->implicitRefIsDefined(i))
+ if (MInst->getImplicitOp(i).opIsDefOnly() ||
+ MInst->getImplicitOp(i).opIsDefAndUse())
LVS.erase(MInst->getImplicitRef(i));
}
for (MachineInstr::const_val_op_iterator OpI = MInst->begin(),
OpE = MInst->end(); OpI != OpE; ++OpI) {
if (!isa<BasicBlock>(*OpI)) // don't process labels
- if (!OpI.isDef()) // add only if this operand is a use
+ // add only if this operand is a use
+ if (!OpI.isDefOnly() || OpI.isDefAndUse() )
LVS.insert(*OpI); // An operand is a use - so add to use set
}
// do for implicit operands as well
for (unsigned i = 0, e = MInst->getNumImplicitRefs(); i != e; ++i)
- if (!MInst->implicitRefIsDefined(i))
+ if (MInst->getImplicitOp(i).opIsUse() ||
+ MInst->getImplicitOp(i).opIsDefAndUse())
LVS.insert(MInst->getImplicitRef(i));
}
//-----------------------------------------------------------------------------
void FunctionLiveVarInfo::calcLiveVarSetsForBB(const BasicBlock *BB) {
- const MachineCodeForBasicBlock &MIVec = BB->getMachineInstrVec();
+ BBLiveVar *BBLV = BBLiveVar::GetFromBB(*BB);
+ assert(BBLV && "BBLiveVar annotation doesn't exist?");
+ const MachineBasicBlock &MIVec = BBLV->getMachineBasicBlock();
+ const MachineFunction &MF = MachineFunction::get(M);
+ const TargetMachine &TM = MF.getTarget();
if (DEBUG_LV >= LV_DEBUG_Instr)
std::cerr << "\n======For BB " << BB->getName()
<< ": Live var sets for instructions======\n";
- ValueSet CurSet;
- const ValueSet *SetAI = &getOutSetOfBB(BB); // init SetAI with OutSet
- set_union(CurSet, *SetAI); // CurSet now contains OutSet
+ ValueSet *SetAI = &getOutSetOfBB(BB); // init SetAI with OutSet
+ ValueSet CurSet(*SetAI); // CurSet now contains OutSet
// iterate over all the machine instructions in BB
- for (MachineCodeForBasicBlock::const_reverse_iterator MII = MIVec.rbegin(),
+ for (MachineBasicBlock::const_reverse_iterator MII = MIVec.rbegin(),
MIE = MIVec.rend(); MII != MIE; ++MII) {
// MI is cur machine inst
const MachineInstr *MI = *MII;
MInst2LVSetAI[MI] = SetAI; // record in After Inst map
applyTranferFuncForMInst(CurSet, MI); // apply the transfer Func
- ValueSet *NewSet = new ValueSet(); // create a new set and
- set_union(*NewSet, CurSet); // copy the set after T/F to it
-
+ ValueSet *NewSet = new ValueSet(CurSet); // create a new set with a copy
+ // of the set after T/F
MInst2LVSetBI[MI] = NewSet; // record in Before Inst map
+ // If the current machine instruction has delay slots, mark values
+ // used by this instruction as live before and after each delay slot
+ // instruction (After(MI) is the same as Before(MI+1) except for last MI).
+ if (unsigned DS = TM.getInstrInfo().getNumDelaySlots(MI->getOpCode())) {
+ MachineBasicBlock::const_iterator fwdMII = MII.base(); // ptr to *next* MI
+ for (unsigned i = 0; i < DS; ++i, ++fwdMII) {
+ assert(fwdMII != MIVec.end() && "Missing instruction in delay slot?");
+ MachineInstr* DelaySlotMI = *fwdMII;
+ if (! TM.getInstrInfo().isNop(DelaySlotMI->getOpCode())) {
+ set_union(*MInst2LVSetBI[DelaySlotMI], *NewSet);
+ if (i+1 == DS)
+ set_union(*MInst2LVSetAI[DelaySlotMI], *NewSet);
+ }
+ }
+ }
+
if (DEBUG_LV >= LV_DEBUG_Instr) {
std::cerr << "\nLive var sets before/after instruction " << *MI;
std::cerr << " Before: "; printSet(*NewSet); std::cerr << "\n";
projects / oota-llvm.git / blobdiff