OpenHarmony-v4.1-Release/s

/*
 * Copyright (c) 2023 Huawei Device Co., Ltd.
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 *
 *     http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */

#include "aarch64_dependence.h"
#include "aarch64_cg.h"
#include "aarch64_operand.h"
#include "pressure.h"

/* For building dependence graph, The entry is AArch64DepAnalysis::Run. */
namespace maplebe {
/* constructor */
AArch64DepAnalysis::AArch64DepAnalysis(CGFunc &func, MemPool &mp, MAD &mad, bool beforeRA)
    : DepAnalysis(func, mp, mad, beforeRA),
      stackUses(alloc.Adapter()),
      stackDefs(alloc.Adapter()),
      heapUses(alloc.Adapter()),
      heapDefs(alloc.Adapter()),
      mayThrows(alloc.Adapter()),
      ambiInsns(alloc.Adapter()),
      ehInRegs(alloc.Adapter())
{
    uint32 maxRegNum;
    if (beforeRA) {
        maxRegNum = cgFunc.GetMaxVReg();
    } else {
        maxRegNum = kAllRegNum;
    }
    regDefs = memPool.NewArray<Insn *>(maxRegNum);
    regUses = memPool.NewArray<RegList *>(maxRegNum);
}

/* print dep node information */
void AArch64DepAnalysis::DumpDepNode(DepNode &node) const
{
    node.GetInsn()->Dump();
    uint32 num = node.GetUnitNum();
    LogInfo::MapleLogger() << "unit num : " << num << ", ";
    for (uint32 i = 0; i < num; ++i) {
        const Unit *unit = node.GetUnitByIndex(i);
        if (unit != nullptr) {
            PRINT_VAL(unit->GetName());
        } else {
            PRINT_VAL("none");
        }
    }
    LogInfo::MapleLogger() << '\n';
    node.DumpSchedInfo();
    if (beforeRA) {
        node.DumpRegPressure();
    }
}

/* print dep link information */
void AArch64DepAnalysis::DumpDepLink(DepLink &link, const DepNode *node) const
{
    PRINT_VAL(GetDepTypeName(link.GetDepType()));
    PRINT_STR_VAL("Latency: ", link.GetLatency());
    if (node != nullptr) {
        node->GetInsn()->Dump();
        return;
    }
    LogInfo::MapleLogger() << "from : ";
    link.GetFrom().GetInsn()->Dump();
    LogInfo::MapleLogger() << "to : ";
    link.GetTo().GetInsn()->Dump();
}

/* Append use register to the list. */
void AArch64DepAnalysis::AppendRegUseList(Insn &insn, regno_t regNO)
{
    RegList *regList = memPool.New<RegList>();
    regList->insn = &insn;
    regList->next = nullptr;
    if (regUses[regNO] == nullptr) {
        regUses[regNO] = regList;
        if (beforeRA) {
            Insn *defInsn = regDefs[regNO];
            if (defInsn == nullptr) {
                return;
            }
            DepNode *defNode = defInsn->GetDepNode();
            defNode->SetRegDefs(regNO, regList);
        }
        return;
    }
    RegList *lastRegList = regUses[regNO];
    while (lastRegList->next != nullptr) {
        lastRegList = lastRegList->next;
    }
    lastRegList->next = regList;
}

/*
 * Add dependence edge.
 * Two dependence node has a unique edge.
 * True dependence overwirtes other dependences.
 */
void AArch64DepAnalysis::AddDependence(DepNode &fromNode, DepNode &toNode, DepType depType)
{
    /* Can not build a self loop dependence. */
    if (&fromNode == &toNode) {
        return;
    }
    /* Check if exist edge. */
    if (!fromNode.GetSuccs().empty()) {
        DepLink *depLink = fromNode.GetSuccs().back();
        if (&(depLink->GetTo()) == &toNode) {
            if (depLink->GetDepType() != kDependenceTypeTrue) {
                if (depType == kDependenceTypeTrue) {
                    /* Has exist edge, replace it. */
                    depLink->SetDepType(kDependenceTypeTrue);
                    depLink->SetLatency(mad.GetLatency(*fromNode.GetInsn(), *toNode.GetInsn()));
                }
            }
            return;
        }
    }
    DepLink *depLink = memPool.New<DepLink>(fromNode, toNode, depType);
    if (depType == kDependenceTypeTrue) {
        depLink->SetLatency(mad.GetLatency(*fromNode.GetInsn(), *toNode.GetInsn()));
    }
    fromNode.AddSucc(*depLink);
    toNode.AddPred(*depLink);
}

void AArch64DepAnalysis::AddDependence4InsnInVectorByType(MapleVector<Insn *> &insns, Insn &insn, const DepType &type)
{
    for (auto anyInsn : insns) {
        AddDependence(*anyInsn->GetDepNode(), *insn.GetDepNode(), type);
    }
}

void AArch64DepAnalysis::AddDependence4InsnInVectorByTypeAndCmp(MapleVector<Insn *> &insns, Insn &insn,
                                                                const DepType &type)
{
    for (auto anyInsn : insns) {
        if (anyInsn != &insn) {
            AddDependence(*anyInsn->GetDepNode(), *insn.GetDepNode(), type);
        }
    }
}

/* Remove self dependence (self loop) in dependence graph. */
void AArch64DepAnalysis::RemoveSelfDeps(Insn &insn)
{
    DepNode *node = insn.GetDepNode();
    DEBUG_ASSERT(node->GetSuccs().back()->GetTo().GetInsn() == &insn, "Is not a self dependence.");
    DEBUG_ASSERT(node->GetPreds().back()->GetFrom().GetInsn() == &insn, "Is not a self dependence.");
    node->RemoveSucc();
    node->RemovePred();
}

/* Build dependences of source register operand. */
void AArch64DepAnalysis::BuildDepsUseReg(Insn &insn, regno_t regNO)
{
    DepNode *node = insn.GetDepNode();
    node->AddUseReg(regNO);
    if (regDefs[regNO] != nullptr) {
        /* Build true dependences. */
        AddDependence(*regDefs[regNO]->GetDepNode(), *insn.GetDepNode(), kDependenceTypeTrue);
    }
}

/* Build dependences of destination register operand. */
void AArch64DepAnalysis::BuildDepsDefReg(Insn &insn, regno_t regNO)
{
    DepNode *node = insn.GetDepNode();
    node->AddDefReg(regNO);
    /* Build anti dependences. */
    RegList *regList = regUses[regNO];
    while (regList != nullptr) {
        CHECK_NULL_FATAL(regList->insn);
        AddDependence(*regList->insn->GetDepNode(), *node, kDependenceTypeAnti);
        regList = regList->next;
    }
    /* Build output depnedence. */
    if (regDefs[regNO] != nullptr) {
        AddDependence(*regDefs[regNO]->GetDepNode(), *node, kDependenceTypeOutput);
    }
}

void AArch64DepAnalysis::ReplaceDepNodeWithNewInsn(DepNode &firstNode, DepNode &secondNode, Insn &newInsn,
                                                   bool isFromClinit) const
{
    if (isFromClinit) {
        firstNode.AddClinitInsn(*firstNode.GetInsn());
        firstNode.AddClinitInsn(*secondNode.GetInsn());
        firstNode.SetCfiInsns(secondNode.GetCfiInsns());
    } else {
        for (Insn *insn : secondNode.GetCfiInsns()) {
            firstNode.AddCfiInsn(*insn);
        }
        for (Insn *insn : secondNode.GetComments()) {
            firstNode.AddComments(*insn);
        }
        secondNode.ClearComments();
    }
    firstNode.SetInsn(newInsn);
    Reservation *rev = mad.FindReservation(newInsn);
    CHECK_FATAL(rev != nullptr, "reservation is nullptr.");
    firstNode.SetReservation(*rev);
    firstNode.SetUnits(rev->GetUnit());
    firstNode.SetUnitNum(rev->GetUnitNum());
    newInsn.SetDepNode(firstNode);
}

void AArch64DepAnalysis::ClearDepNodeInfo(DepNode &depNode) const
{
    Insn &insn = cgFunc.GetInsnBuilder()->BuildInsn<AArch64CG>(MOP_pseudo_none);
    insn.SetDepNode(depNode);
    Reservation *seRev = mad.FindReservation(insn);
    depNode.SetInsn(insn);
    depNode.SetType(kNodeTypeEmpty);
    depNode.SetReservation(*seRev);
    depNode.SetUnitNum(0);
    depNode.ClearCfiInsns();
    depNode.SetUnits(nullptr);
}

/* Combine adrpldr&clinit_tail to clinit. */
void AArch64DepAnalysis::CombineClinit(DepNode &firstNode, DepNode &secondNode, bool isAcrossSeparator)
{
    DEBUG_ASSERT(firstNode.GetInsn()->GetMachineOpcode() == MOP_adrp_ldr, "first insn should be adrpldr");
    DEBUG_ASSERT(secondNode.GetInsn()->GetMachineOpcode() == MOP_clinit_tail, "second insn should be clinit_tail");
    DEBUG_ASSERT(firstNode.GetCfiInsns().empty(), "There should not be any comment/cfi instructions between clinit.");
    DEBUG_ASSERT(secondNode.GetComments().empty(), "There should not be any comment/cfi instructions between clinit.");
    Insn &newInsn = cgFunc.GetInsnBuilder()->BuildInsn(MOP_clinit, firstNode.GetInsn()->GetOperand(0),
                                                       firstNode.GetInsn()->GetOperand(1));
    newInsn.SetId(firstNode.GetInsn()->GetId());
    /* Replace first node with new insn. */
    ReplaceDepNodeWithNewInsn(firstNode, secondNode, newInsn, true);
    /* Clear second node information. */
    ClearDepNodeInfo(secondNode);
    CombineDependence(firstNode, secondNode, isAcrossSeparator);
}

/*
 *  Combine memory access pair:
 *   1.ldr to ldp.
 *   2.str to stp.
 */
void AArch64DepAnalysis::CombineMemoryAccessPair(DepNode &firstNode, DepNode &secondNode, bool useFirstOffset)
{
    DEBUG_ASSERT(firstNode.GetInsn(), "the insn of first Node should not be nullptr");
    DEBUG_ASSERT(secondNode.GetInsn(), "the insn of second Node should not be nullptr");
    MOperator thisMop = firstNode.GetInsn()->GetMachineOpcode();
    MOperator mopPair = GetMopPair(thisMop);
    DEBUG_ASSERT(mopPair != 0, "mopPair should not be zero");
    Operand *opnd0 = nullptr;
    Operand *opnd1 = nullptr;
    Operand *opnd2 = nullptr;
    if (useFirstOffset) {
        opnd0 = &(firstNode.GetInsn()->GetOperand(0));
        opnd1 = &(secondNode.GetInsn()->GetOperand(0));
        opnd2 = &(firstNode.GetInsn()->GetOperand(1));
    } else {
        opnd0 = &(secondNode.GetInsn()->GetOperand(0));
        opnd1 = &(firstNode.GetInsn()->GetOperand(0));
        opnd2 = &(secondNode.GetInsn()->GetOperand(1));
    }
    Insn &newInsn = cgFunc.GetInsnBuilder()->BuildInsn(mopPair, *opnd0, *opnd1, *opnd2);
    newInsn.SetId(firstNode.GetInsn()->GetId());
    std::string newComment;
    const MapleString &comment = firstNode.GetInsn()->GetComment();
    if (comment.c_str() != nullptr) {
        newComment += comment.c_str();
    }
    const MapleString &secondComment = secondNode.GetInsn()->GetComment();
    if (secondComment.c_str() != nullptr) {
        newComment += "  ";
        newComment += secondComment.c_str();
    }
    if ((newComment.c_str() != nullptr) && (strlen(newComment.c_str()) > 0)) {
        newInsn.SetComment(newComment);
    }
    /* Replace first node with new insn. */
    ReplaceDepNodeWithNewInsn(firstNode, secondNode, newInsn, false);
    /* Clear second node information. */
    ClearDepNodeInfo(secondNode);
    CombineDependence(firstNode, secondNode, false, true);
}

/* Combine two dependence nodes to one */
void AArch64DepAnalysis::CombineDependence(DepNode &firstNode, DepNode &secondNode, bool isAcrossSeparator,
                                           bool isMemCombine)
{
    if (isAcrossSeparator) {
        /* Clear all latency of the second node. */
        for (auto predLink : secondNode.GetPreds()) {
            predLink->SetLatency(0);
        }
        for (auto succLink : secondNode.GetSuccs()) {
            succLink->SetLatency(0);
        }
        return;
    }
    std::set<DepNode *> uniqueNodes;

    for (auto predLink : firstNode.GetPreds()) {
        if (predLink->GetDepType() == kDependenceTypeTrue) {
            predLink->SetLatency(mad.GetLatency(*predLink->GetFrom().GetInsn(), *firstNode.GetInsn()));
        }
        (void)uniqueNodes.insert(&predLink->GetFrom());
    }
    for (auto predLink : secondNode.GetPreds()) {
        if (&predLink->GetFrom() != &firstNode) {
            if (uniqueNodes.insert(&(predLink->GetFrom())).second) {
                AddDependence(predLink->GetFrom(), firstNode, predLink->GetDepType());
            }
        }
        predLink->SetLatency(0);
    }
    uniqueNodes.clear();
    for (auto succLink : firstNode.GetSuccs()) {
        if (succLink->GetDepType() == kDependenceTypeTrue) {
            succLink->SetLatency(mad.GetLatency(*succLink->GetFrom().GetInsn(), *firstNode.GetInsn()));
        }
        (void)uniqueNodes.insert(&(succLink->GetTo()));
    }
    for (auto succLink : secondNode.GetSuccs()) {
        if (uniqueNodes.insert(&(succLink->GetTo())).second) {
            AddDependence(firstNode, succLink->GetTo(), succLink->GetDepType());
            if (isMemCombine) {
                succLink->GetTo().IncreaseValidPredsSize();
            }
        }
        succLink->SetLatency(0);
    }
}

/*
 * Build dependences of ambiguous instruction.
 * ambiguous instruction : instructions that can not across may throw instructions.
 */
void AArch64DepAnalysis::BuildDepsAmbiInsn(Insn &insn)
{
    AddDependence4InsnInVectorByType(mayThrows, insn, kDependenceTypeThrow);
    ambiInsns.emplace_back(&insn);
}

/* Build dependences of may throw instructions. */
void AArch64DepAnalysis::BuildDepsMayThrowInsn(Insn &insn)
{
    AddDependence4InsnInVectorByType(ambiInsns, insn, kDependenceTypeThrow);
}

bool AArch64DepAnalysis::IsFrameReg(const RegOperand &opnd) const
{
    return (opnd.GetRegisterNumber() == RFP) || (opnd.GetRegisterNumber() == RSP);
}

MemOperand *AArch64DepAnalysis::BuildNextMemOperandByByteSize(const MemOperand &aarchMemOpnd, uint32 byteSize) const
{
    MemOperand *nextMemOpnd = aarchMemOpnd.Clone(memPool);
    Operand *nextOfstOpnd = nextMemOpnd->GetOffsetImmediate()->Clone(memPool);
    OfstOperand *aarchNextOfstOpnd = static_cast<OfstOperand *>(nextOfstOpnd);
    CHECK_NULL_FATAL(aarchNextOfstOpnd);
    int32 offsetVal = static_cast<int32>(aarchNextOfstOpnd->GetOffsetValue());
    aarchNextOfstOpnd->SetOffsetValue(offsetVal + byteSize);
    nextMemOpnd->SetOffsetOperand(*aarchNextOfstOpnd);
    return nextMemOpnd;
}

/* Get the second memory access operand of stp/ldp instructions. */
MemOperand *AArch64DepAnalysis::GetNextMemOperand(const Insn &insn, const MemOperand &aarchMemOpnd) const
{
    MemOperand *nextMemOpnd = nullptr;
    switch (insn.GetMachineOpcode()) {
        case MOP_wldp:
        case MOP_sldp:
        case MOP_xldpsw:
        case MOP_wstp:
        case MOP_sstp: {
            nextMemOpnd = BuildNextMemOperandByByteSize(aarchMemOpnd, k4ByteSize);
            break;
        }
        case MOP_xldp:
        case MOP_dldp:
        case MOP_xstp:
        case MOP_dstp: {
            nextMemOpnd = BuildNextMemOperandByByteSize(aarchMemOpnd, k8ByteSize);
            break;
        }
        default:
            break;
    }

    return nextMemOpnd;
}

/*
 * Build dependences of symbol memory access.
 * Memory access with symbol must be a heap memory access.
 */
void AArch64DepAnalysis::BuildDepsAccessStImmMem(Insn &insn, bool isDest)
{
    if (isDest) {
        /*
         * Heap memory
         * Build anti dependences.
         */
        AddDependence4InsnInVectorByType(heapUses, insn, kDependenceTypeAnti);
        /* Build output depnedence. */
        AddDependence4InsnInVectorByType(heapDefs, insn, kDependenceTypeOutput);
        heapDefs.emplace_back(&insn);
    } else {
        /* Heap memory */
        AddDependence4InsnInVectorByType(heapDefs, insn, kDependenceTypeTrue);
        heapUses.emplace_back(&insn);
    }
    if (memBarInsn != nullptr) {
        AddDependence(*memBarInsn->GetDepNode(), *insn.GetDepNode(), kDependenceTypeMembar);
    }
}

/* Build dependences of stack memory and heap memory uses. */
void AArch64DepAnalysis::BuildDepsUseMem(Insn &insn, MemOperand &aarchMemOpnd)
{
    RegOperand *baseRegister = aarchMemOpnd.GetBaseRegister();
    MemOperand *nextMemOpnd = GetNextMemOperand(insn, aarchMemOpnd);

    aarchMemOpnd.SetAccessSize(insn.GetMemoryByteSize());
    /* Stack memory address */
    for (auto defInsn : stackDefs) {
        if (defInsn->IsCall() || NeedBuildDepsMem(aarchMemOpnd, nextMemOpnd, *defInsn)) {
            AddDependence(*defInsn->GetDepNode(), *insn.GetDepNode(), kDependenceTypeTrue);
            continue;
        }
    }
    /* Heap memory */
    AddDependence4InsnInVectorByType(heapDefs, insn, kDependenceTypeTrue);
    if (((baseRegister != nullptr) && IsFrameReg(*baseRegister)) || aarchMemOpnd.IsStackMem()) {
        stackUses.emplace_back(&insn);
    } else {
        heapUses.emplace_back(&insn);
    }
    if (memBarInsn != nullptr) {
        AddDependence(*memBarInsn->GetDepNode(), *insn.GetDepNode(), kDependenceTypeMembar);
    }
}

static bool NoAlias(const MemOperand &leftOpnd, const MemOperand &rightOpnd)
{
    if (leftOpnd.GetAddrMode() == MemOperand::kAddrModeBOi && rightOpnd.GetAddrMode() == MemOperand::kAddrModeBOi &&
        leftOpnd.GetIndexOpt() == MemOperand::kIntact && rightOpnd.GetIndexOpt() == MemOperand::kIntact) {
        if (leftOpnd.GetBaseRegister()->GetRegisterNumber() == RFP ||
            rightOpnd.GetBaseRegister()->GetRegisterNumber() == RFP) {
            Operand *ofstOpnd = leftOpnd.GetOffsetOperand();
            Operand *rofstOpnd = rightOpnd.GetOffsetOperand();
            DEBUG_ASSERT(ofstOpnd != nullptr, "offset operand should not be null.");
            DEBUG_ASSERT(rofstOpnd != nullptr, "offset operand should not be null.");
            ImmOperand *ofst = static_cast<ImmOperand *>(ofstOpnd);
            ImmOperand *rofst = static_cast<ImmOperand *>(rofstOpnd);
            DEBUG_ASSERT(ofst != nullptr, "CG internal error, invalid type.");
            DEBUG_ASSERT(rofst != nullptr, "CG internal error, invalid type.");
            return (!ofst->ValueEquals(*rofst));
        }
    }
    return false;
}

static bool NoOverlap(const MemOperand &leftOpnd, const MemOperand &rightOpnd)
{
    if (leftOpnd.GetAddrMode() != MemOperand::kAddrModeBOi || rightOpnd.GetAddrMode() != MemOperand::kAddrModeBOi ||
        leftOpnd.GetIndexOpt() != MemOperand::kIntact || rightOpnd.GetIndexOpt() != MemOperand::kIntact) {
        return false;
    }
    if (leftOpnd.GetBaseRegister()->GetRegisterNumber() != RFP ||
        rightOpnd.GetBaseRegister()->GetRegisterNumber() != RFP) {
        return false;
    }
    int64 ofset1 = leftOpnd.GetOffsetOperand()->GetValue();
    int64 ofset2 = rightOpnd.GetOffsetOperand()->GetValue();
    if (ofset1 < ofset2) {
        return ((ofset1 + leftOpnd.GetAccessSize()) <= ofset2);
    } else {
        return ((ofset2 + rightOpnd.GetAccessSize()) <= ofset1);
    }
}

/* Return true if memInsn's memOpnd no alias with memOpnd and nextMemOpnd */
bool AArch64DepAnalysis::NeedBuildDepsMem(const MemOperand &memOpnd, const MemOperand *nextMemOpnd,
                                          const Insn &memInsn) const
{
    auto *memOpndOfmemInsn = static_cast<MemOperand *>(memInsn.GetMemOpnd());
    if (!NoAlias(memOpnd, *memOpndOfmemInsn) ||
        ((nextMemOpnd != nullptr) && !NoAlias(*nextMemOpnd, *memOpndOfmemInsn))) {
        return true;
    }
    if (cgFunc.GetMirModule().GetSrcLang() == kSrcLangC && !memInsn.IsCall()) {
        static_cast<MemOperand *>(memInsn.GetMemOpnd())->SetAccessSize(memInsn.GetMemoryByteSize());
        return (!NoOverlap(memOpnd, *memOpndOfmemInsn));
    }
    MemOperand *nextMemOpndOfmemInsn = GetNextMemOperand(memInsn, *memOpndOfmemInsn);
    if (nextMemOpndOfmemInsn != nullptr) {
        if (!NoAlias(memOpnd, *nextMemOpndOfmemInsn) ||
            ((nextMemOpnd != nullptr) && !NoAlias(*nextMemOpnd, *nextMemOpndOfmemInsn))) {
            return true;
        }
    }
    return false;
}

/*
 * Build anti dependences between insn and other insn that use stack memroy.
 * insn        : the instruction that defines stack memory.
 * memOpnd     : insn's memOpnd
 * nextMemOpnd : some memory pair operator instruction (like ldp/stp) defines two memory.
 */
void AArch64DepAnalysis::BuildAntiDepsDefStackMem(Insn &insn, MemOperand &memOpnd, const MemOperand *nextMemOpnd)
{
    memOpnd.SetAccessSize(insn.GetMemoryByteSize());
    for (auto *useInsn : stackUses) {
        if (NeedBuildDepsMem(memOpnd, nextMemOpnd, *useInsn)) {
            AddDependence(*useInsn->GetDepNode(), *insn.GetDepNode(), kDependenceTypeAnti);
        }
    }
}

/*
 * Build output dependences between insn with other insn that define stack memroy.
 * insn        : the instruction that defines stack memory.
 * memOpnd     : insn's memOpnd
 * nextMemOpnd : some memory pair operator instruction (like ldp/stp) defines two memory.
 */
void AArch64DepAnalysis::BuildOutputDepsDefStackMem(Insn &insn, MemOperand &memOpnd, const MemOperand *nextMemOpnd)
{
    memOpnd.SetAccessSize(insn.GetMemoryByteSize());
    for (auto defInsn : stackDefs) {
        if (defInsn->IsCall() || NeedBuildDepsMem(memOpnd, nextMemOpnd, *defInsn)) {
            AddDependence(*defInsn->GetDepNode(), *insn.GetDepNode(), kDependenceTypeOutput);
        }
    }
}

/* Build dependences of stack memory and heap memory definitions. */
void AArch64DepAnalysis::BuildDepsDefMem(Insn &insn, MemOperand &aarchMemOpnd)
{
    RegOperand *baseRegister = aarchMemOpnd.GetBaseRegister();
    MemOperand *nextMemOpnd = GetNextMemOperand(insn, aarchMemOpnd);

    /* Build anti dependences. */
    BuildAntiDepsDefStackMem(insn, aarchMemOpnd, nextMemOpnd);
    /* Build output depnedence. */
    BuildOutputDepsDefStackMem(insn, aarchMemOpnd, nextMemOpnd);
    if (lastCallInsn != nullptr) {
        /* Build a dependence between stack passed arguments and call. */
        DEBUG_ASSERT(baseRegister != nullptr, "baseRegister shouldn't be null here");
        if (baseRegister->GetRegisterNumber() == RSP) {
            AddDependence(*lastCallInsn->GetDepNode(), *insn.GetDepNode(), kDependenceTypeControl);
        }
    }

    /* Heap memory
     * Build anti dependences.
     */
    AddDependence4InsnInVectorByType(heapUses, insn, kDependenceTypeAnti);
    /* Build output depnedence. */
    AddDependence4InsnInVectorByType(heapDefs, insn, kDependenceTypeOutput);

    if (((baseRegister != nullptr) && IsFrameReg(*baseRegister)) || aarchMemOpnd.IsStackMem()) {
        stackDefs.emplace_back(&insn);
    } else {
        heapDefs.emplace_back(&insn);
    }
    if (memBarInsn != nullptr) {
        AddDependence(*memBarInsn->GetDepNode(), *insn.GetDepNode(), kDependenceTypeMembar);
    }
    /* Memory definition can not across may-throw insns. */
    AddDependence4InsnInVectorByType(mayThrows, insn, kDependenceTypeThrow);
}

/* Build dependences of memory barrior instructions. */
void AArch64DepAnalysis::BuildDepsMemBar(Insn &insn)
{
    AddDependence4InsnInVectorByTypeAndCmp(stackUses, insn, kDependenceTypeMembar);
    AddDependence4InsnInVectorByTypeAndCmp(heapUses, insn, kDependenceTypeMembar);
    AddDependence4InsnInVectorByTypeAndCmp(stackDefs, insn, kDependenceTypeMembar);
    AddDependence4InsnInVectorByTypeAndCmp(heapDefs, insn, kDependenceTypeMembar);
    memBarInsn = &insn;
}

/* A pseudo separator node depends all the other nodes. */
void AArch64DepAnalysis::BuildDepsSeparator(DepNode &newSepNode, MapleVector<DepNode *> &nodes)
{
    uint32 nextSepIndex = (separatorIndex + kMaxDependenceNum) < nodes.size() ? (separatorIndex + kMaxDependenceNum)
                                                                              : static_cast<uint32>(nodes.size() - 1);
    newSepNode.ReservePreds(nextSepIndex - separatorIndex);
    newSepNode.ReserveSuccs(nextSepIndex - separatorIndex);
    for (uint32 i = separatorIndex; i < nextSepIndex; ++i) {
        AddDependence(*nodes[i], newSepNode, kDependenceTypeSeparator);
    }
}

/* Build control dependence for branch/ret instructions. */
void AArch64DepAnalysis::BuildDepsControlAll(DepNode &depNode, const MapleVector<DepNode *> &nodes)
{
    for (uint32 i = separatorIndex; i < depNode.GetIndex(); ++i) {
        AddDependence(*nodes[i], depNode, kDependenceTypeControl);
    }
}

/*
 * Build dependences of call instructions.
 * Caller-saved physical registers will defined by a call instruction.
 * Also a conditional register may modified by a call.
 */
void AArch64DepAnalysis::BuildCallerSavedDeps(Insn &insn)
{
    /* Build anti dependence and output dependence. */
    for (uint32 i = R0; i <= R7; ++i) {
        BuildDepsDefReg(insn, i);
    }
    for (uint32 i = V0; i <= V7; ++i) {
        BuildDepsDefReg(insn, i);
    }
    if (!beforeRA) {
        for (uint32 i = R8; i <= R18; ++i) {
            BuildDepsDefReg(insn, i);
        }
        for (uint32 i = RLR; i <= RSP; ++i) {
            BuildDepsUseReg(insn, i);
        }
        for (uint32 i = V16; i <= V31; ++i) {
            BuildDepsDefReg(insn, i);
        }
    }
    /* For condition operand, such as NE, EQ, and so on. */
    if (cgFunc.GetRflag() != nullptr) {
        BuildDepsDefReg(insn, kRFLAG);
    }
}

/*
 * Build dependence between control register and last call instruction.
 * insn : instruction that with control register operand.
 * isDest : if the control register operand is a destination operand.
 */
void AArch64DepAnalysis::BuildDepsBetweenControlRegAndCall(Insn &insn, bool isDest)
{
    if (lastCallInsn == nullptr) {
        return;
    }
    if (isDest) {
        AddDependence(*lastCallInsn->GetDepNode(), *insn.GetDepNode(), kDependenceTypeOutput);
        return;
    }
    AddDependence(*lastCallInsn->GetDepNode(), *insn.GetDepNode(), kDependenceTypeAnti);
}

/*
 * Build dependence between stack-define-instruction that deal with call-insn's args and a call-instruction.
 * insn : a call instruction (call/tail-call)
 */
void AArch64DepAnalysis::BuildStackPassArgsDeps(Insn &insn)
{
    for (auto stackDefInsn : stackDefs) {
        if (stackDefInsn->IsCall()) {
            continue;
        }
        Operand *opnd = stackDefInsn->GetMemOpnd();
        DEBUG_ASSERT(opnd->IsMemoryAccessOperand(), "make sure opnd is memOpnd");
        MemOperand *memOpnd = static_cast<MemOperand *>(opnd);
        RegOperand *baseReg = memOpnd->GetBaseRegister();
        if ((baseReg != nullptr) && (baseReg->GetRegisterNumber() == RSP)) {
            AddDependence(*stackDefInsn->GetDepNode(), *insn.GetDepNode(), kDependenceTypeControl);
        }
    }
}

/* Some insns may dirty all stack memory, such as "bl MCC_InitializeLocalStackRef". */
void AArch64DepAnalysis::BuildDepsDirtyStack(Insn &insn)
{
    /* Build anti dependences. */
    AddDependence4InsnInVectorByType(stackUses, insn, kDependenceTypeAnti);
    /* Build output depnedence. */
    AddDependence4InsnInVectorByType(stackDefs, insn, kDependenceTypeOutput);
    stackDefs.emplace_back(&insn);
}

/* Some call insns may use all stack memory, such as "bl MCC_CleanupLocalStackRef_NaiveRCFast". */
void AArch64DepAnalysis::BuildDepsUseStack(Insn &insn)
{
    /* Build true dependences. */
    AddDependence4InsnInVectorByType(stackDefs, insn, kDependenceTypeTrue);
}

/* Some insns may dirty all heap memory, such as a call insn. */
void AArch64DepAnalysis::BuildDepsDirtyHeap(Insn &insn)
{
    /* Build anti dependences. */
    AddDependence4InsnInVectorByType(heapUses, insn, kDependenceTypeAnti);
    /* Build output depnedence. */
    AddDependence4InsnInVectorByType(heapDefs, insn, kDependenceTypeOutput);
    if (memBarInsn != nullptr) {
        AddDependence(*memBarInsn->GetDepNode(), *insn.GetDepNode(), kDependenceTypeMembar);
    }
    heapDefs.emplace_back(&insn);
}

/* Build a pseudo node to seperate dependence graph. */
DepNode *AArch64DepAnalysis::BuildSeparatorNode()
{
    Insn &pseudoSepInsn = cgFunc.GetInsnBuilder()->BuildInsn<AArch64CG>(MOP_pseudo_dependence_seperator);
    DepNode *separatorNode = memPool.New<DepNode>(pseudoSepInsn, alloc);
    separatorNode->SetType(kNodeTypeSeparator);
    pseudoSepInsn.SetDepNode(*separatorNode);
    if (beforeRA) {
        RegPressure *regPressure = memPool.New<RegPressure>(alloc);
        separatorNode->SetRegPressure(*regPressure);
        separatorNode->InitPressure();
    }
    return separatorNode;
}

/* Init depAnalysis data struction */
void AArch64DepAnalysis::Init(BB &bb, MapleVector<DepNode *> &nodes)
{
    curBB = &bb;
    ClearAllDepData();
    lastComments.clear();
    /* Analysis live-in registers in catch BB. */
    AnalysisAmbiInsns(bb);
    /* Clear all dependence nodes and push the first separator node. */
    nodes.clear();
    DepNode *pseudoSepNode = BuildSeparatorNode();
    nodes.emplace_back(pseudoSepNode);
    separatorIndex = 0;

    if (beforeRA) {
        /* assump first pseudo_dependence_seperator insn of current bb define live-in's registers */
        Insn *pseudoSepInsn = pseudoSepNode->GetInsn();
        for (auto &regNO : bb.GetLiveInRegNO()) {
            regDefs[regNO] = pseudoSepInsn;
            pseudoSepNode->AddDefReg(regNO);
            pseudoSepNode->SetRegDefs(pseudoSepNode->GetDefRegnos().size(), nullptr);
        }
    }
}

/* When a separator build, it is the same as a new basic block. */
void AArch64DepAnalysis::ClearAllDepData()
{
    uint32 maxRegNum;
    if (beforeRA) {
        maxRegNum = cgFunc.GetMaxVReg();
    } else {
        maxRegNum = kAllRegNum;
    }
    errno_t ret = memset_s(regDefs, sizeof(Insn *) * maxRegNum, 0, sizeof(Insn *) * maxRegNum);
    CHECK_FATAL(ret == EOK, "call memset_s failed in Unit");
    ret = memset_s(regUses, sizeof(RegList *) * maxRegNum, 0, sizeof(RegList *) * maxRegNum);
    CHECK_FATAL(ret == EOK, "call memset_s failed in Unit");
    memBarInsn = nullptr;
    lastCallInsn = nullptr;
    lastFrameDef = nullptr;

    stackUses.clear();
    stackDefs.clear();
    heapUses.clear();
    heapDefs.clear();
    mayThrows.clear();
    ambiInsns.clear();
}

/* Analysis live-in registers in catch bb and cleanup bb. */
void AArch64DepAnalysis::AnalysisAmbiInsns(BB &bb)
{
    hasAmbiRegs = false;
    if (bb.GetEhSuccs().empty()) {
        return;
    }

    /* Union all catch bb */
    for (auto succBB : bb.GetEhSuccs()) {
        const MapleSet<regno_t> &liveInRegSet = succBB->GetLiveInRegNO();
        set_union(liveInRegSet.begin(), liveInRegSet.end(), ehInRegs.begin(), ehInRegs.end(),
                  inserter(ehInRegs, ehInRegs.begin()));
    }

    /* Union cleanup entry bb. */
    const MapleSet<regno_t> &regNOSet = cgFunc.GetCleanupEntryBB()->GetLiveInRegNO();
    std::set_union(regNOSet.begin(), regNOSet.end(), ehInRegs.begin(), ehInRegs.end(),
                   inserter(ehInRegs, ehInRegs.begin()));

    /* Subtract R0 and R1, that is defined by eh runtime. */
    ehInRegs.erase(R0);
    ehInRegs.erase(R1);
    if (ehInRegs.empty()) {
        return;
    }
    hasAmbiRegs = true;
}

/* Check if regNO is in ehInRegs. */
bool AArch64DepAnalysis::IfInAmbiRegs(regno_t regNO) const
{
    if (!hasAmbiRegs) {
        return false;
    }
    if (ehInRegs.find(regNO) != ehInRegs.end()) {
        return true;
    }
    return false;
}

static bool IsYieldPoint(Insn &insn)
{
    /*
     * It is a yieldpoint if loading from a dedicated
     * register holding polling page address:
     * ldr  wzr, [RYP]
     */
    if (insn.IsLoad() && !insn.IsLoadLabel()) {
        auto mem = static_cast<MemOperand *>(insn.GetMemOpnd());
        return (mem != nullptr && mem->GetBaseRegister() != nullptr &&
                mem->GetBaseRegister()->GetRegisterNumber() == RYP);
    }
    return false;
}

/*
 * Build dependences of memory operand.
 * insn : a instruction with the memory access operand.
 * opnd : the memory access operand.
 * regProp : operand property of the memory access operandess operand.
 */
void AArch64DepAnalysis::BuildMemOpndDependency(Insn &insn, Operand &opnd, const OpndDesc &regProp)
{
    DEBUG_ASSERT(opnd.IsMemoryAccessOperand(), "opnd must be memory Operand");
    MemOperand *memOpnd = static_cast<MemOperand *>(&opnd);
    RegOperand *baseRegister = memOpnd->GetBaseRegister();
    if (baseRegister != nullptr) {
        regno_t regNO = baseRegister->GetRegisterNumber();
        BuildDepsUseReg(insn, regNO);
        if ((memOpnd->GetAddrMode() == MemOperand::kAddrModeBOi) &&
            (memOpnd->IsPostIndexed() || memOpnd->IsPreIndexed())) {
            /* Base operand has changed. */
            BuildDepsDefReg(insn, regNO);
        }
    }
    RegOperand *indexRegister = memOpnd->GetIndexRegister();
    if (indexRegister != nullptr) {
        regno_t regNO = indexRegister->GetRegisterNumber();
        BuildDepsUseReg(insn, regNO);
    }
    if (regProp.IsUse()) {
        BuildDepsUseMem(insn, *memOpnd);
    } else {
        BuildDepsDefMem(insn, *memOpnd);
        BuildDepsAmbiInsn(insn);
    }
    if (IsYieldPoint(insn)) {
        BuildDepsMemBar(insn);
        BuildDepsDefReg(insn, kRFLAG);
    }
}

/* Build Dependency for each Operand of insn */
void AArch64DepAnalysis::BuildOpndDependency(Insn &insn)
{
    const InsnDesc *md = insn.GetDesc();
    MOperator mOp = insn.GetMachineOpcode();
    uint32 opndNum = insn.GetOperandSize();
    for (uint32 i = 0; i < opndNum; ++i) {
        Operand &opnd = insn.GetOperand(i);
        const OpndDesc *regProp = md->opndMD[i];
        if (opnd.IsMemoryAccessOperand()) {
            BuildMemOpndDependency(insn, opnd, *regProp);
        } else if (opnd.IsStImmediate()) {
            if (mOp != MOP_xadrpl12) {
                BuildDepsAccessStImmMem(insn, false);
            }
        } else if (opnd.IsRegister()) {
            RegOperand &regOpnd = static_cast<RegOperand &>(opnd);
            regno_t regNO = regOpnd.GetRegisterNumber();

            if (regProp->IsUse()) {
                BuildDepsUseReg(insn, regNO);
            }

            if (regProp->IsDef()) {
                BuildDepsDefReg(insn, regNO);
            }
        } else if (opnd.IsConditionCode()) {
            /* For condition operand, such as NE, EQ, and so on. */
            if (regProp->IsUse()) {
                BuildDepsUseReg(insn, kRFLAG);
                BuildDepsBetweenControlRegAndCall(insn, false);
            }

            if (regProp->IsDef()) {
                BuildDepsDefReg(insn, kRFLAG);
                BuildDepsBetweenControlRegAndCall(insn, true);
            }
        } else if (opnd.IsList()) {
            ListOperand &listOpnd = static_cast<ListOperand &>(opnd);
            /* Build true dependences */
            for (auto lst : listOpnd.GetOperands()) {
                regno_t regNO = lst->GetRegisterNumber();
                BuildDepsUseReg(insn, regNO);
            }
        }
    }
}

static bool IsLazyLoad(MOperator op)
{
    return (op == MOP_lazy_ldr) || (op == MOP_lazy_ldr_static) || (op == MOP_lazy_tail);
}

/*
 * Build dependences in some special issue (stack/heap/throw/clinit/lazy binding/control flow).
 * insn :  a instruction.
 * depNode : insn's depNode.
 * nodes : the dependence nodes inclue insn's depNode.
 */
void AArch64DepAnalysis::BuildSpecialInsnDependency(Insn &insn, DepNode &depNode, const MapleVector<DepNode *> &nodes)
{
    const InsnDesc *md = insn.GetDesc();
    MOperator mOp = insn.GetMachineOpcode();
    if (insn.IsCall() || insn.IsTailCall()) {
        /* Caller saved registers. */
        BuildCallerSavedDeps(insn);
        BuildStackPassArgsDeps(insn);

        if (mOp == MOP_xbl) {
            FuncNameOperand &target = static_cast<FuncNameOperand &>(insn.GetOperand(0));
            if ((target.GetName() == "MCC_InitializeLocalStackRef") || (target.GetName() == "MCC_ClearLocalStackRef") ||
                (target.GetName() == "MCC_DecRefResetPair")) {
                /* Write stack memory. */
                BuildDepsDirtyStack(insn);
            } else if ((target.GetName() == "MCC_CleanupLocalStackRef_NaiveRCFast") ||
                       (target.GetName() == "MCC_CleanupLocalStackRefSkip_NaiveRCFast") ||
                       (target.GetName() == "MCC_CleanupLocalStackRefSkip")) {
                /* UseStackMemory. */
                BuildDepsUseStack(insn);
            } else if (cgFunc.GetMirModule().GetSrcLang() == kSrcLangC) {
                /* potential C aliasing. */
                BuildDepsDirtyStack(insn);
            }
        }
        BuildDepsDirtyHeap(insn);
        BuildDepsAmbiInsn(insn);
        if (lastCallInsn != nullptr) {
            AddDependence(*lastCallInsn->GetDepNode(), *insn.GetDepNode(), kDependenceTypeControl);
        }
        lastCallInsn = &insn;
    } else if (insn.IsClinit() || IsLazyLoad(insn.GetMachineOpcode()) ||
               insn.GetMachineOpcode() == MOP_arrayclass_cache_ldr) {
        BuildDepsDirtyHeap(insn);
        BuildDepsDefReg(insn, kRFLAG);
        if (insn.GetMachineOpcode() != MOP_adrp_ldr) {
            BuildDepsDefReg(insn, R16);
            BuildDepsDefReg(insn, R17);
        }
    } else if ((mOp == MOP_xret) || md->IsBranch()) {
        BuildDepsControlAll(depNode, nodes);
    } else if (insn.IsMemAccessBar()) {
        BuildDepsMemBar(insn);
    } else if (insn.IsSpecialIntrinsic()) {
        BuildDepsDirtyHeap(insn);
    }
}

/*
 * If the instruction's number of current basic block more than kMaxDependenceNum,
 * then insert some pseudo separator node to split baic block.
 */
void AArch64DepAnalysis::SeperateDependenceGraph(MapleVector<DepNode *> &nodes, uint32 &nodeSum)
{
    if ((nodeSum > 0) && ((nodeSum % kMaxDependenceNum) == 0)) {
        DEBUG_ASSERT(nodeSum == nodes.size(), "CG internal error, nodeSum should equal to nodes.size.");
        /* Add a pseudo node to seperate dependence graph. */
        DepNode *separatorNode = BuildSeparatorNode();
        separatorNode->SetIndex(nodeSum);
        nodes.emplace_back(separatorNode);
        BuildDepsSeparator(*separatorNode, nodes);

        if (beforeRA) {
            /* for all live-out register of current bb */
            for (auto &regNO : curBB->GetLiveOutRegNO()) {
                if (regDefs[regNO] != nullptr) {
                    AppendRegUseList(*(separatorNode->GetInsn()), regNO);
                    separatorNode->AddUseReg(regNO);
                    separatorNode->SetRegUses(*regUses[regNO]);
                }
            }
        }
        ClearAllDepData();
        separatorIndex = nodeSum++;
    }
}

/*
 * Generate a depNode,
 * insn  : create depNode for the instruction.
 * nodes : a vector to store depNode.
 * nodeSum  : the new depNode's index.
 * comments : those comment insn between last no-comment's insn and insn.
 */
DepNode *AArch64DepAnalysis::GenerateDepNode(Insn &insn, MapleVector<DepNode *> &nodes, int32 nodeSum,
                                             const MapleVector<Insn *> &comments)
{
    DepNode *depNode = nullptr;
    Reservation *rev = mad.FindReservation(insn);
    DEBUG_ASSERT(rev != nullptr, "rev is nullptr");
    depNode = memPool.New<DepNode>(insn, alloc, rev->GetUnit(), rev->GetUnitNum(), *rev);
    if (beforeRA) {
        RegPressure *regPressure = memPool.New<RegPressure>(alloc);
        depNode->SetRegPressure(*regPressure);
        depNode->InitPressure();
    }
    depNode->SetIndex(nodeSum);
    nodes.emplace_back(depNode);
    insn.SetDepNode(*depNode);

    constexpr size_t vectorSize = 5;
    depNode->ReservePreds(vectorSize);
    depNode->ReserveSuccs(vectorSize);

    if (!comments.empty()) {
        depNode->SetComments(comments);
    }
    return depNode;
}

void AArch64DepAnalysis::BuildAmbiInsnDependency(Insn &insn)
{
    const auto &defRegnos = insn.GetDepNode()->GetDefRegnos();
    for (const auto &regNO : defRegnos) {
        if (IfInAmbiRegs(regNO)) {
            BuildDepsAmbiInsn(insn);
            break;
        }
    }
}

void AArch64DepAnalysis::BuildMayThrowInsnDependency(Insn &insn)
{
    /* build dependency for maythrow insn; */
    if (insn.MayThrow()) {
        BuildDepsMayThrowInsn(insn);
        if (lastFrameDef != nullptr) {
            AddDependence(*lastFrameDef->GetDepNode(), *insn.GetDepNode(), kDependenceTypeThrow);
        }
    }
}

void AArch64DepAnalysis::UpdateRegUseAndDef(Insn &insn, const DepNode &depNode, MapleVector<DepNode *> &nodes)
{
    const auto &useRegnos = depNode.GetUseRegnos();
    if (beforeRA) {
        depNode.InitRegUsesSize(useRegnos.size());
    }
    for (auto regNO : useRegnos) {
        AppendRegUseList(insn, regNO);
        if (beforeRA) {
            depNode.SetRegUses(*regUses[regNO]);
            if (regDefs[regNO] == nullptr) {
                regDefs[regNO] = nodes[separatorIndex]->GetInsn();
                nodes[separatorIndex]->AddDefReg(regNO);
                nodes[separatorIndex]->SetRegDefs(nodes[separatorIndex]->GetDefRegnos().size(), regUses[regNO]);
            }
        }
    }

    const auto &defRegnos = depNode.GetDefRegnos();
    size_t i = 0;
    if (beforeRA) {
        depNode.InitRegDefsSize(defRegnos.size());
    }
    for (const auto regNO : defRegnos) {
        regDefs[regNO] = &insn;
        regUses[regNO] = nullptr;
        if (beforeRA) {
            depNode.SetRegDefs(i, nullptr);
            if (regNO >= R0 && regNO <= R3) {
                depNode.SetHasPreg(true);
            } else if (regNO == R8) {
                depNode.SetHasNativeCallRegister(true);
            }
        }
        ++i;
    }
}

/* Update stack and heap dependency */
void AArch64DepAnalysis::UpdateStackAndHeapDependency(DepNode &depNode, Insn &insn, const Insn &locInsn)
{
    if (!insn.MayThrow()) {
        return;
    }
    depNode.SetLocInsn(locInsn);
    mayThrows.emplace_back(&insn);
    AddDependence4InsnInVectorByType(stackDefs, insn, kDependenceTypeThrow);
    AddDependence4InsnInVectorByType(heapDefs, insn, kDependenceTypeThrow);
}

/* Add a separatorNode to the end of a nodes
 *  * before RA:  add all live-out registers to this separatorNode'Uses
 *   */
void AArch64DepAnalysis::AddEndSeparatorNode(MapleVector<DepNode *> &nodes)
{
    DepNode *separatorNode = BuildSeparatorNode();
    nodes.emplace_back(separatorNode);
    BuildDepsSeparator(*separatorNode, nodes);

    if (beforeRA) {
        /* for all live-out register of current bb */
        for (auto &regNO : curBB->GetLiveOutRegNO()) {
            if (regDefs[regNO] != nullptr) {
                AppendRegUseList(*(separatorNode->GetInsn()), regNO);
                separatorNode->AddUseReg(regNO);
                separatorNode->SetRegUses(*regUses[regNO]);
            }
        }
    }
}

/*
 * Build dependence graph.
 * 1: Build dependence nodes.
 * 2: Build edges between dependence nodes. Edges are:
 *   2.1) True dependences
 *   2.2) Anti dependences
 *   2.3) Output dependences
 *   2.4) Barrier dependences
 */
void AArch64DepAnalysis::Run(BB &bb, MapleVector<DepNode *> &nodes)
{
    /* Initial internal datas. */
    Init(bb, nodes);
    uint32 nodeSum = 1;
    MapleVector<Insn *> comments(alloc.Adapter());
    const Insn *locInsn = bb.GetFirstLoc();
    FOR_BB_INSNS(insn, (&bb)) {
        if (!insn->IsMachineInstruction()) {
            if (insn->IsImmaterialInsn()) {
                if (!insn->IsComment()) {
                    locInsn = insn;
                } else {
                    comments.emplace_back(insn);
                }
            } else if (insn->IsCfiInsn()) {
                if (!nodes.empty()) {
                    nodes.back()->AddCfiInsn(*insn);
                }
            }
            continue;
        }
        /* Add a pseudo node to seperate dependence graph when appropriate */
        SeperateDependenceGraph(nodes, nodeSum);
        /* generate a DepNode */
        DepNode *depNode = GenerateDepNode(*insn, nodes, nodeSum, comments);
        ++nodeSum;
        comments.clear();
        /* Build Dependency for maythrow insn; */
        BuildMayThrowInsnDependency(*insn);
        /* Build Dependency for each Operand of insn */
        BuildOpndDependency(*insn);
        /* Build Dependency for special insn */
        BuildSpecialInsnDependency(*insn, *depNode, nodes);
        /* Build Dependency for AmbiInsn if needed */
        BuildAmbiInsnDependency(*insn);
        /* Update stack and heap dependency */
        UpdateStackAndHeapDependency(*depNode, *insn, *locInsn);
        if (insn->IsFrameDef()) {
            lastFrameDef = insn;
        }
        /* Seperator exists. */
        AddDependence(*nodes[separatorIndex], *insn->GetDepNode(), kDependenceTypeSeparator);
        /* Update register use and register def */
        UpdateRegUseAndDef(*insn, *depNode, nodes);
    }

    AddEndSeparatorNode(nodes);

    if (!comments.empty()) {
        lastComments = comments;
    }
    comments.clear();
}

/* return dependence type name */
const std::string &AArch64DepAnalysis::GetDepTypeName(DepType depType) const
{
    DEBUG_ASSERT(depType <= kDependenceTypeNone, "array boundary check failed");
    return kDepTypeName[depType];
}
} /* namespace maplebe */