AbstractFunctionDecl *SILDeclRef::getOverriddenWitnessTableEntry(
AbstractFunctionDecl *func) {
if (!isa<ProtocolDecl>(func->getDeclContext()))
return func;
AbstractFunctionDecl *bestOverridden = nullptr;
SmallVector<AbstractFunctionDecl *, 4> stack;
SmallPtrSet<AbstractFunctionDecl *, 4> visited;
stack.push_back(func);
visited.insert(func);
while (!stack.empty()) {
auto current = stack.back();
stack.pop_back();
auto overriddenDecls = current->getOverriddenDecls();
if (overriddenDecls.empty()) {
// This entry introduced a witness table entry. Determine whether it is
// better than the best entry we've seen thus far.
if (!bestOverridden ||
ProtocolDecl::compare(
cast<ProtocolDecl>(current->getDeclContext()),
cast<ProtocolDecl>(bestOverridden->getDeclContext()))
< 0) {
bestOverridden = cast<AbstractFunctionDecl>(current);
}
continue;
}
// Add overridden declarations to the stack.
for (auto overridden : overriddenDecls) {
auto overriddenFunc = cast<AbstractFunctionDecl>(overridden);
if (visited.insert(overriddenFunc).second)
stack.push_back(overriddenFunc);
}
}
return bestOverridden;
}
bool CXXRecordDecl::forallBases(ForallBasesCallback *BaseMatches,
void *OpaqueData,
bool AllowShortCircuit) const {
SmallVector<const CXXRecordDecl*, 8> Queue;
const CXXRecordDecl *Record = this;
bool AllMatches = true;
while (true) {
for (CXXRecordDecl::base_class_const_iterator
I = Record->bases_begin(), E = Record->bases_end(); I != E; ++I) {
const RecordType *Ty = I->getType()->getAs<RecordType>();
if (!Ty) {
if (AllowShortCircuit) return false;
AllMatches = false;
continue;
}
CXXRecordDecl *Base =
cast_or_null<CXXRecordDecl>(Ty->getDecl()->getDefinition());
if (!Base) {
if (AllowShortCircuit) return false;
AllMatches = false;
continue;
}
Queue.push_back(Base);
if (!BaseMatches(Base, OpaqueData)) {
if (AllowShortCircuit) return false;
AllMatches = false;
continue;
}
}
if (Queue.empty()) break;
Record = Queue.back(); // not actually a queue.
Queue.pop_back();
}
return AllMatches;
}
void NestedNameSpecifierLocBuilder::MakeTrivial(ASTContext &Context,
NestedNameSpecifier *Qualifier,
SourceRange R) {
Representation = Qualifier;
// Construct bogus (but well-formed) source information for the
// nested-name-specifier.
BufferSize = 0;
SmallVector<NestedNameSpecifier *, 4> Stack;
for (NestedNameSpecifier *NNS = Qualifier; NNS; NNS = NNS->getPrefix())
Stack.push_back(NNS);
while (!Stack.empty()) {
NestedNameSpecifier *NNS = Stack.back();
Stack.pop_back();
switch (NNS->getKind()) {
case NestedNameSpecifier::Identifier:
case NestedNameSpecifier::Namespace:
case NestedNameSpecifier::NamespaceAlias:
SaveSourceLocation(R.getBegin(), Buffer, BufferSize, BufferCapacity);
break;
case NestedNameSpecifier::TypeSpec:
case NestedNameSpecifier::TypeSpecWithTemplate: {
TypeSourceInfo *TSInfo
= Context.getTrivialTypeSourceInfo(QualType(NNS->getAsType(), 0),
R.getBegin());
SavePointer(TSInfo->getTypeLoc().getOpaqueData(), Buffer, BufferSize,
BufferCapacity);
break;
}
case NestedNameSpecifier::Global:
break;
}
// Save the location of the '::'.
SaveSourceLocation(Stack.empty()? R.getEnd() : R.getBegin(),
Buffer, BufferSize, BufferCapacity);
}
}
/// constructScopeNest
void LexicalScopes::constructScopeNest(LexicalScope *Scope) {
assert(Scope && "Unable to calculate scope dominance graph!");
SmallVector<LexicalScope *, 4> WorkStack;
WorkStack.push_back(Scope);
unsigned Counter = 0;
while (!WorkStack.empty()) {
LexicalScope *WS = WorkStack.back();
const SmallVectorImpl<LexicalScope *> &Children = WS->getChildren();
bool visitedChildren = false;
for (auto &ChildScope : Children)
if (!ChildScope->getDFSOut()) {
WorkStack.push_back(ChildScope);
visitedChildren = true;
ChildScope->setDFSIn(++Counter);
break;
}
if (!visitedChildren) {
WorkStack.pop_back();
WS->setDFSOut(++Counter);
}
}
}
// Look through full copies and PHIs to get the set of non-copy MachineInstrs
// that can produce MI.
void A15SDOptimizer::elideCopiesAndPHIs(MachineInstr *MI,
SmallVectorImpl<MachineInstr*> &Outs) {
// Looking through PHIs may create loops so we need to track what
// instructions we have visited before.
std::set<MachineInstr *> Reached;
SmallVector<MachineInstr *, 8> Front;
Front.push_back(MI);
while (Front.size() != 0) {
MI = Front.back();
Front.pop_back();
// If we have already explored this MachineInstr, ignore it.
if (Reached.find(MI) != Reached.end())
continue;
Reached.insert(MI);
if (MI->isPHI()) {
for (unsigned I = 1, E = MI->getNumOperands(); I != E; I += 2) {
unsigned Reg = MI->getOperand(I).getReg();
if (!TRI->isVirtualRegister(Reg)) {
continue;
}
MachineInstr *NewMI = MRI->getVRegDef(Reg);
if (!NewMI)
continue;
Front.push_back(NewMI);
}
} else if (MI->isFullCopy()) {
if (!TRI->isVirtualRegister(MI->getOperand(1).getReg()))
continue;
MachineInstr *NewMI = MRI->getVRegDef(MI->getOperand(1).getReg());
if (!NewMI)
continue;
Front.push_back(NewMI);
} else {
DEBUG(dbgs() << "Found partial copy" << *MI <<"\n");
Outs.push_back(MI);
}
}
}
void ScheduleDAGSDNodes::dumpNode(const SUnit &SU) const {
#if !defined(NDEBUG) || defined(LLVM_ENABLE_DUMP)
dumpNodeName(SU);
dbgs() << ": ";
if (!SU.getNode()) {
dbgs() << "PHYS REG COPY\n";
return;
}
SU.getNode()->dump(DAG);
dbgs() << "\n";
SmallVector<SDNode *, 4> GluedNodes;
for (SDNode *N = SU.getNode()->getGluedNode(); N; N = N->getGluedNode())
GluedNodes.push_back(N);
while (!GluedNodes.empty()) {
dbgs() << " ";
GluedNodes.back()->dump(DAG);
dbgs() << "\n";
GluedNodes.pop_back();
}
#endif
}
void Module::markUnavailable(bool MissingRequirement) {
if (!IsAvailable)
return;
SmallVector<Module *, 2> Stack;
Stack.push_back(this);
while (!Stack.empty()) {
Module *Current = Stack.back();
Stack.pop_back();
if (!Current->IsAvailable)
continue;
Current->IsAvailable = false;
Current->IsMissingRequirement |= MissingRequirement;
for (submodule_iterator Sub = Current->submodule_begin(),
SubEnd = Current->submodule_end();
Sub != SubEnd; ++Sub) {
if ((*Sub)->IsAvailable)
Stack.push_back(*Sub);
}
}
}
static bool IsValueIntLoadRecursive(Value *V) {
SmallVector<Value*, 4> Worklist;
DenseSet<const Value *> VisitedValues;
Worklist.push_back(V);
VisitedValues.insert(V);
while (!Worklist.empty()) {
Value *CurValue = Worklist.back();
Worklist.pop_back();
if (!CanCheckValue(CurValue))
continue;
if (IsLoad(CurValue))
return true;
if (User *U = dyn_cast<User>(CurValue)) {
// Do not walk through call instructions. The call arguments are not
// necessarily directly related to the result, so it makes no sense to
// cross-check them.
//
// Alternatively we could check call return values as if they were loads
// expected to be datarando'd, but this may add false positives. Will
// just ignore calls for now.
if (isa<CallInst>(CurValue) ||
isa<InvokeInst>(CurValue)) {
continue;
}
for (Value *V : U->operands())
if (VisitedValues.insert(V).second)
Worklist.push_back(V);
}
}
return false;
}
bool Find(const TypedValueRegion *R) {
QualType T = R->getValueType();
if (const RecordType *RT = T->getAsStructureType()) {
const RecordDecl *RD = RT->getDecl()->getDefinition();
assert(RD && "Referred record has no definition");
for (const auto *I : RD->fields()) {
const FieldRegion *FR = MrMgr.getFieldRegion(I, R);
FieldChain.push_back(I);
T = I->getType();
if (T->getAsStructureType()) {
if (Find(FR))
return true;
}
else {
const SVal &V = StoreMgr.getBinding(store, loc::MemRegionVal(FR));
if (V.isUndef())
return true;
}
FieldChain.pop_back();
}
}
return false;
}
/// RecursivelyDeleteTriviallyDeadInstructions - If the specified value is a
/// trivially dead instruction, delete it. If that makes any of its operands
/// trivially dead, delete them too, recursively.
///
/// If DeadInst is specified, the vector is filled with the instructions that
/// are actually deleted.
void llvm::RecursivelyDeleteTriviallyDeadInstructions(Value *V,
SmallVectorImpl<Instruction*> *DeadInst) {
Instruction *I = dyn_cast<Instruction>(V);
if (!I || !I->use_empty() || !isInstructionTriviallyDead(I))
return;
SmallVector<Instruction*, 16> DeadInsts;
DeadInsts.push_back(I);
while (!DeadInsts.empty()) {
I = DeadInsts.back();
DeadInsts.pop_back();
// If the client wanted to know, tell it about deleted instructions.
if (DeadInst)
DeadInst->push_back(I);
// Null out all of the instruction's operands to see if any operand becomes
// dead as we go.
for (unsigned i = 0, e = I->getNumOperands(); i != e; ++i) {
Value *OpV = I->getOperand(i);
I->setOperand(i, 0);
if (!OpV->use_empty()) continue;
// If the operand is an instruction that became dead as we nulled out the
// operand, and if it is 'trivially' dead, delete it in a future loop
// iteration.
if (Instruction *OpI = dyn_cast<Instruction>(OpV))
if (isInstructionTriviallyDead(OpI))
DeadInsts.push_back(OpI);
}
I->eraseFromParent();
}
}
/// DeleteUnusedInstr - If an instruction with a tied register operand can
/// be safely deleted, just delete it.
bool
TwoAddressInstructionPass::DeleteUnusedInstr(MachineBasicBlock::iterator &mi,
MachineBasicBlock::iterator &nmi,
MachineFunction::iterator &mbbi,
unsigned Dist) {
// Check if the instruction has no side effects and if all its defs are dead.
SmallVector<unsigned, 4> Kills;
if (!isSafeToDelete(mi, TII, Kills))
return false;
// If this instruction kills some virtual registers, we need to
// update the kill information. If it's not possible to do so,
// then bail out.
SmallVector<NewKill, 4> NewKills;
if (!canUpdateDeletedKills(Kills, NewKills, &*mbbi, Dist))
return false;
if (LV) {
while (!NewKills.empty()) {
MachineInstr *NewKill = NewKills.back().second;
unsigned Kill = NewKills.back().first.first;
bool isDead = NewKills.back().first.second;
NewKills.pop_back();
if (LV->removeVirtualRegisterKilled(Kill, mi)) {
if (isDead)
LV->addVirtualRegisterDead(Kill, NewKill);
else
LV->addVirtualRegisterKilled(Kill, NewKill);
}
}
}
mbbi->erase(mi); // Nuke the old inst.
mi = nmi;
return true;
}
bool Inliner::runOnSCC(CallGraphSCC &SCC) {
CallGraph &CG = getAnalysis<CallGraphWrapperPass>().getCallGraph();
AssumptionCacheTracker *ACT = &getAnalysis<AssumptionCacheTracker>();
auto *TLIP = getAnalysisIfAvailable<TargetLibraryInfoWrapperPass>();
const TargetLibraryInfo *TLI = TLIP ? &TLIP->getTLI() : nullptr;
AliasAnalysis *AA = &getAnalysis<AliasAnalysis>();
SmallPtrSet<Function*, 8> SCCFunctions;
DEBUG(dbgs() << "Inliner visiting SCC:");
for (CallGraphSCC::iterator I = SCC.begin(), E = SCC.end(); I != E; ++I) {
Function *F = (*I)->getFunction();
if (F) SCCFunctions.insert(F);
DEBUG(dbgs() << " " << (F ? F->getName() : "INDIRECTNODE"));
}
// Scan through and identify all call sites ahead of time so that we only
// inline call sites in the original functions, not call sites that result
// from inlining other functions.
SmallVector<std::pair<CallSite, int>, 16> CallSites;
// When inlining a callee produces new call sites, we want to keep track of
// the fact that they were inlined from the callee. This allows us to avoid
// infinite inlining in some obscure cases. To represent this, we use an
// index into the InlineHistory vector.
SmallVector<std::pair<Function*, int>, 8> InlineHistory;
for (CallGraphSCC::iterator I = SCC.begin(), E = SCC.end(); I != E; ++I) {
Function *F = (*I)->getFunction();
if (!F) continue;
for (Function::iterator BB = F->begin(), E = F->end(); BB != E; ++BB)
for (BasicBlock::iterator I = BB->begin(), E = BB->end(); I != E; ++I) {
CallSite CS(cast<Value>(I));
// If this isn't a call, or it is a call to an intrinsic, it can
// never be inlined.
if (!CS || isa<IntrinsicInst>(I))
continue;
// If this is a direct call to an external function, we can never inline
// it. If it is an indirect call, inlining may resolve it to be a
// direct call, so we keep it.
if (CS.getCalledFunction() && CS.getCalledFunction()->isDeclaration())
continue;
CallSites.push_back(std::make_pair(CS, -1));
}
}
DEBUG(dbgs() << ": " << CallSites.size() << " call sites.\n");
// If there are no calls in this function, exit early.
if (CallSites.empty())
return false;
// Now that we have all of the call sites, move the ones to functions in the
// current SCC to the end of the list.
unsigned FirstCallInSCC = CallSites.size();
for (unsigned i = 0; i < FirstCallInSCC; ++i)
if (Function *F = CallSites[i].first.getCalledFunction())
if (SCCFunctions.count(F))
std::swap(CallSites[i--], CallSites[--FirstCallInSCC]);
InlinedArrayAllocasTy InlinedArrayAllocas;
InlineFunctionInfo InlineInfo(&CG, AA, ACT);
// Now that we have all of the call sites, loop over them and inline them if
// it looks profitable to do so.
bool Changed = false;
bool LocalChange;
do {
LocalChange = false;
// Iterate over the outer loop because inlining functions can cause indirect
// calls to become direct calls.
for (unsigned CSi = 0; CSi != CallSites.size(); ++CSi) {
CallSite CS = CallSites[CSi].first;
Function *Caller = CS.getCaller();
Function *Callee = CS.getCalledFunction();
// If this call site is dead and it is to a readonly function, we should
// just delete the call instead of trying to inline it, regardless of
// size. This happens because IPSCCP propagates the result out of the
// call and then we're left with the dead call.
if (isInstructionTriviallyDead(CS.getInstruction(), TLI)) {
DEBUG(dbgs() << " -> Deleting dead call: "
<< *CS.getInstruction() << "\n");
// Update the call graph by deleting the edge from Callee to Caller.
CG[Caller]->removeCallEdgeFor(CS);
CS.getInstruction()->eraseFromParent();
++NumCallsDeleted;
} else {
// We can only inline direct calls to non-declarations.
if (!Callee || Callee->isDeclaration()) continue;
// If this call site was obtained by inlining another function, verify
// that the include path for the function did not include the callee
// itself. If so, we'd be recursively inlining the same function,
// which would provide the same callsites, which would cause us to
// infinitely inline.
int InlineHistoryID = CallSites[CSi].second;
if (InlineHistoryID != -1 &&
InlineHistoryIncludes(Callee, InlineHistoryID, InlineHistory))
continue;
LLVMContext &CallerCtx = Caller->getContext();
// Get DebugLoc to report. CS will be invalid after Inliner.
DebugLoc DLoc = CS.getInstruction()->getDebugLoc();
// If the policy determines that we should inline this function,
// try to do so.
if (!shouldInline(CS)) {
emitOptimizationRemarkMissed(CallerCtx, DEBUG_TYPE, *Caller, DLoc,
Twine(Callee->getName() +
" will not be inlined into " +
Caller->getName()));
continue;
}
// Attempt to inline the function.
if (!InlineCallIfPossible(CS, InlineInfo, InlinedArrayAllocas,
InlineHistoryID, InsertLifetime)) {
emitOptimizationRemarkMissed(CallerCtx, DEBUG_TYPE, *Caller, DLoc,
Twine(Callee->getName() +
" will not be inlined into " +
Caller->getName()));
continue;
}
++NumInlined;
// Report the inline decision.
emitOptimizationRemark(
CallerCtx, DEBUG_TYPE, *Caller, DLoc,
Twine(Callee->getName() + " inlined into " + Caller->getName()));
// If inlining this function gave us any new call sites, throw them
// onto our worklist to process. They are useful inline candidates.
if (!InlineInfo.InlinedCalls.empty()) {
// Create a new inline history entry for this, so that we remember
// that these new callsites came about due to inlining Callee.
int NewHistoryID = InlineHistory.size();
InlineHistory.push_back(std::make_pair(Callee, InlineHistoryID));
for (unsigned i = 0, e = InlineInfo.InlinedCalls.size();
i != e; ++i) {
Value *Ptr = InlineInfo.InlinedCalls[i];
CallSites.push_back(std::make_pair(CallSite(Ptr), NewHistoryID));
}
}
}
// If we inlined or deleted the last possible call site to the function,
// delete the function body now.
if (Callee && Callee->use_empty() && Callee->hasLocalLinkage() &&
// TODO: Can remove if in SCC now.
!SCCFunctions.count(Callee) &&
// The function may be apparently dead, but if there are indirect
// callgraph references to the node, we cannot delete it yet, this
// could invalidate the CGSCC iterator.
CG[Callee]->getNumReferences() == 0) {
DEBUG(dbgs() << " -> Deleting dead function: "
<< Callee->getName() << "\n");
CallGraphNode *CalleeNode = CG[Callee];
// Remove any call graph edges from the callee to its callees.
CalleeNode->removeAllCalledFunctions();
// Removing the node for callee from the call graph and delete it.
delete CG.removeFunctionFromModule(CalleeNode);
++NumDeleted;
}
// Remove this call site from the list. If possible, use
// swap/pop_back for efficiency, but do not use it if doing so would
// move a call site to a function in this SCC before the
// 'FirstCallInSCC' barrier.
if (SCC.isSingular()) {
CallSites[CSi] = CallSites.back();
CallSites.pop_back();
} else {
CallSites.erase(CallSites.begin()+CSi);
}
--CSi;
Changed = true;
LocalChange = true;
}
} while (LocalChange);
return Changed;
}
void WebAssemblyMCInstLower::lower(const MachineInstr *MI,
MCInst &OutMI) const {
OutMI.setOpcode(MI->getOpcode());
const MCInstrDesc &Desc = MI->getDesc();
for (unsigned I = 0, E = MI->getNumOperands(); I != E; ++I) {
const MachineOperand &MO = MI->getOperand(I);
MCOperand MCOp;
switch (MO.getType()) {
default:
MI->print(errs());
llvm_unreachable("unknown operand type");
case MachineOperand::MO_MachineBasicBlock:
MI->print(errs());
llvm_unreachable("MachineBasicBlock operand should have been rewritten");
case MachineOperand::MO_Register: {
// Ignore all implicit register operands.
if (MO.isImplicit())
continue;
const WebAssemblyFunctionInfo &MFI =
*MI->getParent()->getParent()->getInfo<WebAssemblyFunctionInfo>();
unsigned WAReg = MFI.getWAReg(MO.getReg());
MCOp = MCOperand::createReg(WAReg);
break;
}
case MachineOperand::MO_Immediate:
if (I < Desc.NumOperands) {
const MCOperandInfo &Info = Desc.OpInfo[I];
if (Info.OperandType == WebAssembly::OPERAND_TYPEINDEX) {
MCSymbol *Sym = Printer.createTempSymbol("typeindex");
SmallVector<wasm::ValType, 4> Returns;
SmallVector<wasm::ValType, 4> Params;
const MachineRegisterInfo &MRI =
MI->getParent()->getParent()->getRegInfo();
for (const MachineOperand &MO : MI->defs())
Returns.push_back(getType(MRI.getRegClass(MO.getReg())));
for (const MachineOperand &MO : MI->explicit_uses())
if (MO.isReg())
Params.push_back(getType(MRI.getRegClass(MO.getReg())));
// call_indirect instructions have a callee operand at the end which
// doesn't count as a param.
if (WebAssembly::isCallIndirect(*MI))
Params.pop_back();
auto *WasmSym = cast<MCSymbolWasm>(Sym);
auto Signature = make_unique<wasm::WasmSignature>(std::move(Returns),
std::move(Params));
WasmSym->setSignature(Signature.get());
Printer.addSignature(std::move(Signature));
WasmSym->setType(wasm::WASM_SYMBOL_TYPE_FUNCTION);
const MCExpr *Expr = MCSymbolRefExpr::create(
WasmSym, MCSymbolRefExpr::VK_WASM_TYPEINDEX, Ctx);
MCOp = MCOperand::createExpr(Expr);
break;
}
}
MCOp = MCOperand::createImm(MO.getImm());
break;
case MachineOperand::MO_FPImmediate: {
// TODO: MC converts all floating point immediate operands to double.
// This is fine for numeric values, but may cause NaNs to change bits.
const ConstantFP *Imm = MO.getFPImm();
if (Imm->getType()->isFloatTy())
MCOp = MCOperand::createFPImm(Imm->getValueAPF().convertToFloat());
else if (Imm->getType()->isDoubleTy())
MCOp = MCOperand::createFPImm(Imm->getValueAPF().convertToDouble());
else
llvm_unreachable("unknown floating point immediate type");
break;
}
case MachineOperand::MO_GlobalAddress:
MCOp = lowerSymbolOperand(MO, GetGlobalAddressSymbol(MO));
break;
case MachineOperand::MO_ExternalSymbol:
// The target flag indicates whether this is a symbol for a
// variable or a function.
assert(MO.getTargetFlags() == 0 &&
"WebAssembly uses only symbol flags on ExternalSymbols");
MCOp = lowerSymbolOperand(MO, GetExternalSymbolSymbol(MO));
break;
case MachineOperand::MO_MCSymbol:
// This is currently used only for LSDA symbols (GCC_except_table),
// because global addresses or other external symbols are handled above.
assert(MO.getTargetFlags() == 0 &&
"WebAssembly does not use target flags on MCSymbol");
MCOp = lowerSymbolOperand(MO, MO.getMCSymbol());
break;
}
OutMI.addOperand(MCOp);
}
if (!WasmKeepRegisters)
removeRegisterOperands(MI, OutMI);
}
/// EmitSchedule - Emit the machine code in scheduled order. Return the new
/// InsertPos and MachineBasicBlock that contains this insertion
/// point. ScheduleDAGSDNodes holds a BB pointer for convenience, but this does
/// not necessarily refer to returned BB. The emitter may split blocks.
MachineBasicBlock *ScheduleDAGSDNodes::
EmitSchedule(MachineBasicBlock::iterator &InsertPos) {
InstrEmitter Emitter(BB, InsertPos);
DenseMap<SDValue, unsigned> VRBaseMap;
DenseMap<SUnit*, unsigned> CopyVRBaseMap;
SmallVector<std::pair<unsigned, MachineInstr*>, 32> Orders;
SmallSet<unsigned, 8> Seen;
bool HasDbg = DAG->hasDebugValues();
// If this is the first BB, emit byval parameter dbg_value's.
if (HasDbg && BB->getParent()->begin() == MachineFunction::iterator(BB)) {
SDDbgInfo::DbgIterator PDI = DAG->ByvalParmDbgBegin();
SDDbgInfo::DbgIterator PDE = DAG->ByvalParmDbgEnd();
for (; PDI != PDE; ++PDI) {
MachineInstr *DbgMI= Emitter.EmitDbgValue(*PDI, VRBaseMap);
if (DbgMI)
BB->insert(InsertPos, DbgMI);
}
}
for (unsigned i = 0, e = Sequence.size(); i != e; i++) {
SUnit *SU = Sequence[i];
if (!SU) {
// Null SUnit* is a noop.
TII->insertNoop(*Emitter.getBlock(), InsertPos);
continue;
}
// For pre-regalloc scheduling, create instructions corresponding to the
// SDNode and any glued SDNodes and append them to the block.
if (!SU->getNode()) {
// Emit a copy.
EmitPhysRegCopy(SU, CopyVRBaseMap, InsertPos);
continue;
}
SmallVector<SDNode *, 4> GluedNodes;
for (SDNode *N = SU->getNode()->getGluedNode(); N;
N = N->getGluedNode())
GluedNodes.push_back(N);
while (!GluedNodes.empty()) {
SDNode *N = GluedNodes.back();
Emitter.EmitNode(GluedNodes.back(), SU->OrigNode != SU, SU->isCloned,
VRBaseMap);
// Remember the source order of the inserted instruction.
if (HasDbg)
ProcessSourceNode(N, DAG, Emitter, VRBaseMap, Orders, Seen);
GluedNodes.pop_back();
}
Emitter.EmitNode(SU->getNode(), SU->OrigNode != SU, SU->isCloned,
VRBaseMap);
// Remember the source order of the inserted instruction.
if (HasDbg)
ProcessSourceNode(SU->getNode(), DAG, Emitter, VRBaseMap, Orders,
Seen);
}
// Insert all the dbg_values which have not already been inserted in source
// order sequence.
if (HasDbg) {
MachineBasicBlock::iterator BBBegin = BB->getFirstNonPHI();
// Sort the source order instructions and use the order to insert debug
// values.
std::sort(Orders.begin(), Orders.end(), OrderSorter());
SDDbgInfo::DbgIterator DI = DAG->DbgBegin();
SDDbgInfo::DbgIterator DE = DAG->DbgEnd();
// Now emit the rest according to source order.
unsigned LastOrder = 0;
for (unsigned i = 0, e = Orders.size(); i != e && DI != DE; ++i) {
unsigned Order = Orders[i].first;
MachineInstr *MI = Orders[i].second;
// Insert all SDDbgValue's whose order(s) are before "Order".
if (!MI)
continue;
for (; DI != DE &&
(*DI)->getOrder() >= LastOrder && (*DI)->getOrder() < Order; ++DI) {
if ((*DI)->isInvalidated())
continue;
MachineInstr *DbgMI = Emitter.EmitDbgValue(*DI, VRBaseMap);
if (DbgMI) {
if (!LastOrder)
// Insert to start of the BB (after PHIs).
BB->insert(BBBegin, DbgMI);
else {
// Insert at the instruction, which may be in a different
// block, if the block was split by a custom inserter.
MachineBasicBlock::iterator Pos = MI;
MI->getParent()->insert(llvm::next(Pos), DbgMI);
}
}
}
LastOrder = Order;
}
// Add trailing DbgValue's before the terminator. FIXME: May want to add
// some of them before one or more conditional branches?
SmallVector<MachineInstr*, 8> DbgMIs;
while (DI != DE) {
if (!(*DI)->isInvalidated())
if (MachineInstr *DbgMI = Emitter.EmitDbgValue(*DI, VRBaseMap))
DbgMIs.push_back(DbgMI);
++DI;
}
MachineBasicBlock *InsertBB = Emitter.getBlock();
MachineBasicBlock::iterator Pos = InsertBB->getFirstTerminator();
InsertBB->insert(Pos, DbgMIs.begin(), DbgMIs.end());
}
InsertPos = Emitter.getInsertPos();
return Emitter.getBlock();
}
void PathDiagnosticConsumer::HandlePathDiagnostic(PathDiagnostic *D) {
OwningPtr<PathDiagnostic> OwningD(D);
if (!D || D->path.empty())
return;
// We need to flatten the locations (convert Stmt* to locations) because
// the referenced statements may be freed by the time the diagnostics
// are emitted.
D->flattenLocations();
// If the PathDiagnosticConsumer does not support diagnostics that
// cross file boundaries, prune out such diagnostics now.
if (!supportsCrossFileDiagnostics()) {
// Verify that the entire path is from the same FileID.
FileID FID;
const SourceManager &SMgr = (*D->path.begin())->getLocation().getManager();
SmallVector<const PathPieces *, 5> WorkList;
WorkList.push_back(&D->path);
while (!WorkList.empty()) {
const PathPieces &path = *WorkList.back();
WorkList.pop_back();
for (PathPieces::const_iterator I = path.begin(), E = path.end();
I != E; ++I) {
const PathDiagnosticPiece *piece = I->getPtr();
FullSourceLoc L = piece->getLocation().asLocation().getExpansionLoc();
if (FID.isInvalid()) {
FID = SMgr.getFileID(L);
} else if (SMgr.getFileID(L) != FID)
return; // FIXME: Emit a warning?
// Check the source ranges.
ArrayRef<SourceRange> Ranges = piece->getRanges();
for (ArrayRef<SourceRange>::iterator I = Ranges.begin(),
E = Ranges.end(); I != E; ++I) {
SourceLocation L = SMgr.getExpansionLoc(I->getBegin());
if (!L.isFileID() || SMgr.getFileID(L) != FID)
return; // FIXME: Emit a warning?
L = SMgr.getExpansionLoc(I->getEnd());
if (!L.isFileID() || SMgr.getFileID(L) != FID)
return; // FIXME: Emit a warning?
}
if (const PathDiagnosticCallPiece *call =
dyn_cast<PathDiagnosticCallPiece>(piece)) {
WorkList.push_back(&call->path);
}
else if (const PathDiagnosticMacroPiece *macro =
dyn_cast<PathDiagnosticMacroPiece>(piece)) {
WorkList.push_back(¯o->subPieces);
}
}
}
if (FID.isInvalid())
return; // FIXME: Emit a warning?
}
// Profile the node to see if we already have something matching it
llvm::FoldingSetNodeID profile;
D->Profile(profile);
void *InsertPos = 0;
if (PathDiagnostic *orig = Diags.FindNodeOrInsertPos(profile, InsertPos)) {
// Keep the PathDiagnostic with the shorter path.
// Note, the enclosing routine is called in deterministic order, so the
// results will be consistent between runs (no reason to break ties if the
// size is the same).
const unsigned orig_size = orig->full_size();
const unsigned new_size = D->full_size();
if (orig_size <= new_size)
return;
assert(orig != D);
Diags.RemoveNode(orig);
delete orig;
}
Diags.InsertNode(OwningD.take());
}
bool DeclContext::lookupQualified(Type type,
DeclName member,
NLOptions options,
LazyResolver *typeResolver,
SmallVectorImpl<ValueDecl *> &decls) const {
using namespace namelookup;
assert(decls.empty() && "additive lookup not supported");
if (type->is<ErrorType>())
return false;
auto checkLookupCascading = [this, options]() -> Optional<bool> {
switch (static_cast<unsigned>(options & NL_KnownDependencyMask)) {
case 0:
return isCascadingContextForLookup(/*excludeFunctions=*/false);
case NL_KnownNonCascadingDependency:
return false;
case NL_KnownCascadingDependency:
return true;
case NL_KnownNoDependency:
return None;
default:
// FIXME: Use llvm::CountPopulation_64 when that's declared constexpr.
static_assert(__builtin_popcountll(NL_KnownDependencyMask) == 2,
"mask should only include four values");
llvm_unreachable("mask only includes four values");
}
};
// Look through lvalue and inout types.
type = type->getLValueOrInOutObjectType();
// Look through metatypes.
if (auto metaTy = type->getAs<AnyMetatypeType>())
type = metaTy->getInstanceType();
// Look through DynamicSelf.
if (auto dynamicSelf = type->getAs<DynamicSelfType>())
type = dynamicSelf->getSelfType();
// Look for module references.
if (auto moduleTy = type->getAs<ModuleType>()) {
Module *module = moduleTy->getModule();
auto topLevelScope = getModuleScopeContext();
if (module == topLevelScope->getParentModule()) {
if (auto maybeLookupCascade = checkLookupCascading()) {
recordLookupOfTopLevelName(topLevelScope, member,
maybeLookupCascade.getValue());
}
lookupInModule(module, /*accessPath=*/{}, member, decls,
NLKind::QualifiedLookup, ResolutionKind::Overloadable,
typeResolver, topLevelScope);
} else {
// Note: This is a lookup into another module. Unless we're compiling
// multiple modules at once, or if the other module re-exports this one,
// it shouldn't be possible to have a dependency from that module on
// anything in this one.
// Perform the lookup in all imports of this module.
forAllVisibleModules(this,
[&](const Module::ImportedModule &import) -> bool {
if (import.second != module)
return true;
lookupInModule(import.second, import.first, member, decls,
NLKind::QualifiedLookup, ResolutionKind::Overloadable,
typeResolver, topLevelScope);
// If we're able to do an unscoped lookup, we see everything. No need
// to keep going.
return !import.first.empty();
});
}
llvm::SmallPtrSet<ValueDecl *, 4> knownDecls;
decls.erase(std::remove_if(decls.begin(), decls.end(),
[&](ValueDecl *vd) -> bool {
// If we're performing a type lookup, don't even attempt to validate
// the decl if its not a type.
if ((options & NL_OnlyTypes) && !isa<TypeDecl>(vd))
return true;
return !knownDecls.insert(vd).second;
}), decls.end());
if (auto *debugClient = topLevelScope->getParentModule()->getDebugClient())
filterForDiscriminator(decls, debugClient);
return !decls.empty();
}
auto &ctx = getASTContext();
if (!ctx.LangOpts.EnableAccessControl)
options |= NL_IgnoreAccessibility;
// The set of nominal type declarations we should (and have) visited.
SmallVector<NominalTypeDecl *, 4> stack;
llvm::SmallPtrSet<NominalTypeDecl *, 4> visited;
// Handle nominal types.
bool wantProtocolMembers = false;
bool wantLookupInAllClasses = false;
if (auto nominal = type->getAnyNominal()) {
visited.insert(nominal);
stack.push_back(nominal);
wantProtocolMembers = (options & NL_ProtocolMembers) &&
!isa<ProtocolDecl>(nominal);
// If we want dynamic lookup and we're searching in the
// AnyObject protocol, note this for later.
if (options & NL_DynamicLookup) {
if (auto proto = dyn_cast<ProtocolDecl>(nominal)) {
if (proto->isSpecificProtocol(KnownProtocolKind::AnyObject))
wantLookupInAllClasses = true;
}
}
}
// Handle archetypes
else if (auto archetypeTy = type->getAs<ArchetypeType>()) {
// Look in the protocols to which the archetype conforms (always).
for (auto proto : archetypeTy->getConformsTo())
if (visited.insert(proto).second)
stack.push_back(proto);
// If requested, look into the superclasses of this archetype.
if (options & NL_VisitSupertypes) {
if (auto superclassTy = archetypeTy->getSuperclass()) {
if (auto superclassDecl = superclassTy->getAnyNominal()) {
if (visited.insert(superclassDecl).second) {
stack.push_back(superclassDecl);
wantProtocolMembers = (options & NL_ProtocolMembers) &&
!isa<ProtocolDecl>(superclassDecl);
}
}
}
}
}
// Handle protocol compositions.
else if (auto compositionTy = type->getAs<ProtocolCompositionType>()) {
SmallVector<ProtocolDecl *, 4> protocols;
if (compositionTy->isExistentialType(protocols)) {
for (auto proto : protocols) {
if (visited.insert(proto).second) {
stack.push_back(proto);
// If we want dynamic lookup and this is the AnyObject
// protocol, note this for later.
if ((options & NL_DynamicLookup) &&
proto->isSpecificProtocol(KnownProtocolKind::AnyObject))
wantLookupInAllClasses = true;
}
}
}
}
// Allow filtering of the visible declarations based on various
// criteria.
bool onlyCompleteObjectInits = false;
auto isAcceptableDecl = [&](NominalTypeDecl *current, Decl *decl) -> bool {
// If the decl is currently being type checked, then we have something
// cyclic going on. Instead of poking at parts that are potentially not
// set up, just assume it is acceptable. This will make sure we produce an
// error later.
if (decl->isBeingTypeChecked())
return true;
// Filter out designated initializers, if requested.
if (onlyCompleteObjectInits) {
if (auto ctor = dyn_cast<ConstructorDecl>(decl)) {
if (!ctor->isInheritable())
return false;
} else {
return false;
}
}
// Ignore stub implementations.
if (auto ctor = dyn_cast<ConstructorDecl>(decl)) {
if (ctor->hasStubImplementation())
return false;
}
// Check access.
if (!(options & NL_IgnoreAccessibility))
if (auto VD = dyn_cast<ValueDecl>(decl))
return VD->isAccessibleFrom(this);
return true;
};
ReferencedNameTracker *tracker = nullptr;
if (auto containingSourceFile = dyn_cast<SourceFile>(getModuleScopeContext()))
tracker = containingSourceFile->getReferencedNameTracker();
bool isLookupCascading;
if (tracker) {
if (auto maybeLookupCascade = checkLookupCascading())
isLookupCascading = maybeLookupCascade.getValue();
else
tracker = nullptr;
}
// Visit all of the nominal types we know about, discovering any others
// we need along the way.
while (!stack.empty()) {
auto current = stack.back();
stack.pop_back();
if (tracker)
tracker->addUsedMember({current, member.getBaseName()},isLookupCascading);
// Make sure we've resolved implicit constructors, if we need them.
if (member.getBaseName() == ctx.Id_init && typeResolver)
typeResolver->resolveImplicitConstructors(current);
// Look for results within the current nominal type and its extensions.
bool currentIsProtocol = isa<ProtocolDecl>(current);
for (auto decl : current->lookupDirect(member)) {
// If we're performing a type lookup, don't even attempt to validate
// the decl if its not a type.
if ((options & NL_OnlyTypes) && !isa<TypeDecl>(decl))
continue;
// Resolve the declaration signature when we find the
// declaration.
if (typeResolver && !decl->isBeingTypeChecked()) {
typeResolver->resolveDeclSignature(decl);
if (!decl->hasType())
continue;
}
if (isAcceptableDecl(current, decl))
decls.push_back(decl);
}
// If we're not supposed to visit our supertypes, we're done.
if ((options & NL_VisitSupertypes) == 0)
continue;
// Visit superclass.
if (auto classDecl = dyn_cast<ClassDecl>(current)) {
// If we're looking for initializers, only look at the superclass if the
// current class permits inheritance. Even then, only find complete
// object initializers.
bool visitSuperclass = true;
if (member.getBaseName() == ctx.Id_init) {
if (classDecl->inheritsSuperclassInitializers(typeResolver))
onlyCompleteObjectInits = true;
else
visitSuperclass = false;
}
if (visitSuperclass) {
if (auto superclassType = classDecl->getSuperclass())
if (auto superclassDecl = superclassType->getClassOrBoundGenericClass())
if (visited.insert(superclassDecl).second)
stack.push_back(superclassDecl);
}
}
// If we're not looking at a protocol and we're not supposed to
// visit the protocols that this type conforms to, skip the next
// step.
if (!wantProtocolMembers && !currentIsProtocol)
continue;
SmallVector<ProtocolDecl *, 4> protocols;
for (auto proto : current->getAllProtocols()) {
if (visited.insert(proto).second) {
stack.push_back(proto);
}
}
// For a class, we don't need to visit the protocol members of the
// superclass: that's already handled.
if (isa<ClassDecl>(current))
wantProtocolMembers = false;
}
// If we want to perform lookup into all classes, do so now.
if (wantLookupInAllClasses) {
if (tracker)
tracker->addDynamicLookupName(member.getBaseName(), isLookupCascading);
// Collect all of the visible declarations.
SmallVector<ValueDecl *, 4> allDecls;
forAllVisibleModules(this, [&](Module::ImportedModule import) {
import.second->lookupClassMember(import.first, member, allDecls);
});
// For each declaration whose context is not something we've
// already visited above, add it to the list of declarations.
llvm::SmallPtrSet<ValueDecl *, 4> knownDecls;
for (auto decl : allDecls) {
// If we're performing a type lookup, don't even attempt to validate
// the decl if its not a type.
if ((options & NL_OnlyTypes) && !isa<TypeDecl>(decl))
continue;
if (typeResolver && !decl->isBeingTypeChecked()) {
typeResolver->resolveDeclSignature(decl);
if (!decl->hasType())
continue;
}
// If the declaration has an override, name lookup will also have
// found the overridden method. Skip this declaration, because we
// prefer the overridden method.
if (decl->getOverriddenDecl())
continue;
auto dc = decl->getDeclContext();
auto nominal = dyn_cast<NominalTypeDecl>(dc);
if (!nominal) {
auto ext = cast<ExtensionDecl>(dc);
nominal = ext->getExtendedType()->getAnyNominal();
assert(nominal && "Couldn't find nominal type?");
}
// If we didn't visit this nominal type above, add this
// declaration to the list.
if (!visited.count(nominal) && knownDecls.insert(decl).second &&
isAcceptableDecl(nominal, decl))
decls.push_back(decl);
}
}
// If we're supposed to remove overridden declarations, do so now.
if (options & NL_RemoveOverridden)
removeOverriddenDecls(decls);
// If we're supposed to remove shadowed/hidden declarations, do so now.
Module *M = getParentModule();
if (options & NL_RemoveNonVisible)
removeShadowedDecls(decls, M, typeResolver);
if (auto *debugClient = M->getDebugClient())
filterForDiscriminator(decls, debugClient);
// We're done. Report success/failure.
return !decls.empty();
}
void FinalOverriderCollector::Collect(const CXXRecordDecl *RD,
bool VirtualBase,
const CXXRecordDecl *InVirtualSubobject,
CXXFinalOverriderMap &Overriders) {
unsigned SubobjectNumber = 0;
if (!VirtualBase)
SubobjectNumber
= ++SubobjectCount[cast<CXXRecordDecl>(RD->getCanonicalDecl())];
for (CXXRecordDecl::base_class_const_iterator Base = RD->bases_begin(),
BaseEnd = RD->bases_end(); Base != BaseEnd; ++Base) {
if (const RecordType *RT = Base->getType()->getAs<RecordType>()) {
const CXXRecordDecl *BaseDecl = cast<CXXRecordDecl>(RT->getDecl());
if (!BaseDecl->isPolymorphic())
continue;
if (Overriders.empty() && !Base->isVirtual()) {
// There are no other overriders of virtual member functions,
// so let the base class fill in our overriders for us.
Collect(BaseDecl, false, InVirtualSubobject, Overriders);
continue;
}
// Collect all of the overridders from the base class subobject
// and merge them into the set of overridders for this class.
// For virtual base classes, populate or use the cached virtual
// overrides so that we do not walk the virtual base class (and
// its base classes) more than once.
CXXFinalOverriderMap ComputedBaseOverriders;
CXXFinalOverriderMap *BaseOverriders = &ComputedBaseOverriders;
if (Base->isVirtual()) {
CXXFinalOverriderMap *&MyVirtualOverriders = VirtualOverriders[BaseDecl];
BaseOverriders = MyVirtualOverriders;
if (!MyVirtualOverriders) {
MyVirtualOverriders = new CXXFinalOverriderMap;
// Collect may cause VirtualOverriders to reallocate, invalidating the
// MyVirtualOverriders reference. Set BaseOverriders to the right
// value now.
BaseOverriders = MyVirtualOverriders;
Collect(BaseDecl, true, BaseDecl, *MyVirtualOverriders);
}
} else
Collect(BaseDecl, false, InVirtualSubobject, ComputedBaseOverriders);
// Merge the overriders from this base class into our own set of
// overriders.
for (CXXFinalOverriderMap::iterator OM = BaseOverriders->begin(),
OMEnd = BaseOverriders->end();
OM != OMEnd;
++OM) {
const CXXMethodDecl *CanonOM
= cast<CXXMethodDecl>(OM->first->getCanonicalDecl());
Overriders[CanonOM].add(OM->second);
}
}
}
for (CXXRecordDecl::method_iterator M = RD->method_begin(),
MEnd = RD->method_end();
M != MEnd;
++M) {
// We only care about virtual methods.
if (!M->isVirtual())
continue;
CXXMethodDecl *CanonM = cast<CXXMethodDecl>(M->getCanonicalDecl());
if (CanonM->begin_overridden_methods()
== CanonM->end_overridden_methods()) {
// This is a new virtual function that does not override any
// other virtual function. Add it to the map of virtual
// functions for which we are tracking overridders.
// C++ [class.virtual]p2:
// For convenience we say that any virtual function overrides itself.
Overriders[CanonM].add(SubobjectNumber,
UniqueVirtualMethod(CanonM, SubobjectNumber,
InVirtualSubobject));
continue;
}
// This virtual method overrides other virtual methods, so it does
// not add any new slots into the set of overriders. Instead, we
// replace entries in the set of overriders with the new
// overrider. To do so, we dig down to the original virtual
// functions using data recursion and update all of the methods it
// overrides.
typedef std::pair<CXXMethodDecl::method_iterator,
CXXMethodDecl::method_iterator> OverriddenMethods;
SmallVector<OverriddenMethods, 4> Stack;
Stack.push_back(std::make_pair(CanonM->begin_overridden_methods(),
CanonM->end_overridden_methods()));
while (!Stack.empty()) {
OverriddenMethods OverMethods = Stack.back();
Stack.pop_back();
for (; OverMethods.first != OverMethods.second; ++OverMethods.first) {
const CXXMethodDecl *CanonOM
= cast<CXXMethodDecl>((*OverMethods.first)->getCanonicalDecl());
// C++ [class.virtual]p2:
// A virtual member function C::vf of a class object S is
// a final overrider unless the most derived class (1.8)
// of which S is a base class subobject (if any) declares
// or inherits another member function that overrides vf.
//
// Treating this object like the most derived class, we
// replace any overrides from base classes with this
// overriding virtual function.
Overriders[CanonOM].replaceAll(
UniqueVirtualMethod(CanonM, SubobjectNumber,
InVirtualSubobject));
if (CanonOM->begin_overridden_methods()
== CanonOM->end_overridden_methods())
continue;
// Continue recursion to the methods that this virtual method
// overrides.
Stack.push_back(std::make_pair(CanonOM->begin_overridden_methods(),
CanonOM->end_overridden_methods()));
}
}
// C++ [class.virtual]p2:
// For convenience we say that any virtual function overrides itself.
Overriders[CanonM].add(SubobjectNumber,
UniqueVirtualMethod(CanonM, SubobjectNumber,
InVirtualSubobject));
}
}
/// removeInstruction - Remove an instruction from the dependence analysis,
/// updating the dependence of instructions that previously depended on it.
/// This method attempts to keep the cache coherent using the reverse map.
void MemoryDependenceAnalysis::removeInstruction(Instruction *RemInst) {
// Walk through the Non-local dependencies, removing this one as the value
// for any cached queries.
NonLocalDepMapType::iterator NLDI = NonLocalDeps.find(RemInst);
if (NLDI != NonLocalDeps.end()) {
NonLocalDepInfo &BlockMap = NLDI->second.first;
for (NonLocalDepInfo::iterator DI = BlockMap.begin(), DE = BlockMap.end();
DI != DE; ++DI)
if (Instruction *Inst = DI->second.getInst())
RemoveFromReverseMap(ReverseNonLocalDeps, Inst, RemInst);
NonLocalDeps.erase(NLDI);
}
// If we have a cached local dependence query for this instruction, remove it.
//
LocalDepMapType::iterator LocalDepEntry = LocalDeps.find(RemInst);
if (LocalDepEntry != LocalDeps.end()) {
// Remove us from DepInst's reverse set now that the local dep info is gone.
if (Instruction *Inst = LocalDepEntry->second.getInst())
RemoveFromReverseMap(ReverseLocalDeps, Inst, RemInst);
// Remove this local dependency info.
LocalDeps.erase(LocalDepEntry);
}
// If we have any cached pointer dependencies on this instruction, remove
// them. If the instruction has non-pointer type, then it can't be a pointer
// base.
// Remove it from both the load info and the store info. The instruction
// can't be in either of these maps if it is non-pointer.
if (isa<PointerType>(RemInst->getType())) {
RemoveCachedNonLocalPointerDependencies(ValueIsLoadPair(RemInst, false));
RemoveCachedNonLocalPointerDependencies(ValueIsLoadPair(RemInst, true));
}
// Loop over all of the things that depend on the instruction we're removing.
//
SmallVector<std::pair<Instruction*, Instruction*>, 8> ReverseDepsToAdd;
// If we find RemInst as a clobber or Def in any of the maps for other values,
// we need to replace its entry with a dirty version of the instruction after
// it. If RemInst is a terminator, we use a null dirty value.
//
// Using a dirty version of the instruction after RemInst saves having to scan
// the entire block to get to this point.
MemDepResult NewDirtyVal;
if (!RemInst->isTerminator())
NewDirtyVal = MemDepResult::getDirty(++BasicBlock::iterator(RemInst));
ReverseDepMapType::iterator ReverseDepIt = ReverseLocalDeps.find(RemInst);
if (ReverseDepIt != ReverseLocalDeps.end()) {
SmallPtrSet<Instruction*, 4> &ReverseDeps = ReverseDepIt->second;
// RemInst can't be the terminator if it has local stuff depending on it.
assert(!ReverseDeps.empty() && !isa<TerminatorInst>(RemInst) &&
"Nothing can locally depend on a terminator");
for (SmallPtrSet<Instruction*, 4>::iterator I = ReverseDeps.begin(),
E = ReverseDeps.end(); I != E; ++I) {
Instruction *InstDependingOnRemInst = *I;
assert(InstDependingOnRemInst != RemInst &&
"Already removed our local dep info");
LocalDeps[InstDependingOnRemInst] = NewDirtyVal;
// Make sure to remember that new things depend on NewDepInst.
assert(NewDirtyVal.getInst() && "There is no way something else can have "
"a local dep on this if it is a terminator!");
ReverseDepsToAdd.push_back(std::make_pair(NewDirtyVal.getInst(),
InstDependingOnRemInst));
}
ReverseLocalDeps.erase(ReverseDepIt);
// Add new reverse deps after scanning the set, to avoid invalidating the
// 'ReverseDeps' reference.
while (!ReverseDepsToAdd.empty()) {
ReverseLocalDeps[ReverseDepsToAdd.back().first]
.insert(ReverseDepsToAdd.back().second);
ReverseDepsToAdd.pop_back();
}
}
ReverseDepIt = ReverseNonLocalDeps.find(RemInst);
if (ReverseDepIt != ReverseNonLocalDeps.end()) {
SmallPtrSet<Instruction*, 4> &Set = ReverseDepIt->second;
for (SmallPtrSet<Instruction*, 4>::iterator I = Set.begin(), E = Set.end();
I != E; ++I) {
assert(*I != RemInst && "Already removed NonLocalDep info for RemInst");
PerInstNLInfo &INLD = NonLocalDeps[*I];
// The information is now dirty!
INLD.second = true;
for (NonLocalDepInfo::iterator DI = INLD.first.begin(),
DE = INLD.first.end(); DI != DE; ++DI) {
if (DI->second.getInst() != RemInst) continue;
// Convert to a dirty entry for the subsequent instruction.
DI->second = NewDirtyVal;
if (Instruction *NextI = NewDirtyVal.getInst())
ReverseDepsToAdd.push_back(std::make_pair(NextI, *I));
}
}
ReverseNonLocalDeps.erase(ReverseDepIt);
// Add new reverse deps after scanning the set, to avoid invalidating 'Set'
while (!ReverseDepsToAdd.empty()) {
ReverseNonLocalDeps[ReverseDepsToAdd.back().first]
.insert(ReverseDepsToAdd.back().second);
ReverseDepsToAdd.pop_back();
}
}
// If the instruction is in ReverseNonLocalPtrDeps then it appears as a
// value in the NonLocalPointerDeps info.
ReverseNonLocalPtrDepTy::iterator ReversePtrDepIt =
ReverseNonLocalPtrDeps.find(RemInst);
if (ReversePtrDepIt != ReverseNonLocalPtrDeps.end()) {
SmallPtrSet<void*, 4> &Set = ReversePtrDepIt->second;
SmallVector<std::pair<Instruction*, ValueIsLoadPair>,8> ReversePtrDepsToAdd;
for (SmallPtrSet<void*, 4>::iterator I = Set.begin(), E = Set.end();
I != E; ++I) {
ValueIsLoadPair P;
P.setFromOpaqueValue(*I);
assert(P.getPointer() != RemInst &&
"Already removed NonLocalPointerDeps info for RemInst");
NonLocalDepInfo &NLPDI = NonLocalPointerDeps[P].second;
// The cache is not valid for any specific block anymore.
NonLocalPointerDeps[P].first = BBSkipFirstBlockPair();
// Update any entries for RemInst to use the instruction after it.
for (NonLocalDepInfo::iterator DI = NLPDI.begin(), DE = NLPDI.end();
DI != DE; ++DI) {
if (DI->second.getInst() != RemInst) continue;
// Convert to a dirty entry for the subsequent instruction.
DI->second = NewDirtyVal;
if (Instruction *NewDirtyInst = NewDirtyVal.getInst())
ReversePtrDepsToAdd.push_back(std::make_pair(NewDirtyInst, P));
}
// Re-sort the NonLocalDepInfo. Changing the dirty entry to its
// subsequent value may invalidate the sortedness.
std::sort(NLPDI.begin(), NLPDI.end());
}
ReverseNonLocalPtrDeps.erase(ReversePtrDepIt);
while (!ReversePtrDepsToAdd.empty()) {
ReverseNonLocalPtrDeps[ReversePtrDepsToAdd.back().first]
.insert(ReversePtrDepsToAdd.back().second.getOpaqueValue());
ReversePtrDepsToAdd.pop_back();
}
}
assert(!NonLocalDeps.count(RemInst) && "RemInst got reinserted?");
AA->deleteValue(RemInst);
DEBUG(verifyRemoved(RemInst));
}
/// Expand the arguments of a function-like macro so that we can quickly
/// return preexpanded tokens from Tokens.
void TokenLexer::ExpandFunctionArguments() {
SmallVector<Token, 128> ResultToks;
// Loop through 'Tokens', expanding them into ResultToks. Keep
// track of whether we change anything. If not, no need to keep them. If so,
// we install the newly expanded sequence as the new 'Tokens' list.
bool MadeChange = false;
// NextTokGetsSpace - When this is true, the next token appended to the
// output list will get a leading space, regardless of whether it had one to
// begin with or not. This is used for placemarker support.
bool NextTokGetsSpace = false;
for (unsigned i = 0, e = NumTokens; i != e; ++i) {
// If we found the stringify operator, get the argument stringified. The
// preprocessor already verified that the following token is a macro name
// when the #define was parsed.
const Token &CurTok = Tokens[i];
if (CurTok.is(tok::hash) || CurTok.is(tok::hashat)) {
int ArgNo = Macro->getArgumentNum(Tokens[i+1].getIdentifierInfo());
assert(ArgNo != -1 && "Token following # is not an argument?");
SourceLocation ExpansionLocStart =
getExpansionLocForMacroDefLoc(CurTok.getLocation());
SourceLocation ExpansionLocEnd =
getExpansionLocForMacroDefLoc(Tokens[i+1].getLocation());
Token Res;
if (CurTok.is(tok::hash)) // Stringify
Res = ActualArgs->getStringifiedArgument(ArgNo, PP,
ExpansionLocStart,
ExpansionLocEnd);
else {
// 'charify': don't bother caching these.
Res = MacroArgs::StringifyArgument(ActualArgs->getUnexpArgument(ArgNo),
PP, true,
ExpansionLocStart,
ExpansionLocEnd);
}
// The stringified/charified string leading space flag gets set to match
// the #/#@ operator.
if (CurTok.hasLeadingSpace() || NextTokGetsSpace)
Res.setFlag(Token::LeadingSpace);
ResultToks.push_back(Res);
MadeChange = true;
++i; // Skip arg name.
NextTokGetsSpace = false;
continue;
}
// Otherwise, if this is not an argument token, just add the token to the
// output buffer.
IdentifierInfo *II = CurTok.getIdentifierInfo();
int ArgNo = II ? Macro->getArgumentNum(II) : -1;
if (ArgNo == -1) {
// This isn't an argument, just add it.
ResultToks.push_back(CurTok);
if (NextTokGetsSpace) {
ResultToks.back().setFlag(Token::LeadingSpace);
NextTokGetsSpace = false;
}
continue;
}
// An argument is expanded somehow, the result is different than the
// input.
MadeChange = true;
// Otherwise, this is a use of the argument. Find out if there is a paste
// (##) operator before or after the argument.
bool PasteBefore =
!ResultToks.empty() && ResultToks.back().is(tok::hashhash);
bool PasteAfter = i+1 != e && Tokens[i+1].is(tok::hashhash);
// If it is not the LHS/RHS of a ## operator, we must pre-expand the
// argument and substitute the expanded tokens into the result. This is
// C99 6.10.3.1p1.
if (!PasteBefore && !PasteAfter) {
const Token *ResultArgToks;
// Only preexpand the argument if it could possibly need it. This
// avoids some work in common cases.
const Token *ArgTok = ActualArgs->getUnexpArgument(ArgNo);
if (ActualArgs->ArgNeedsPreexpansion(ArgTok, PP))
ResultArgToks = &ActualArgs->getPreExpArgument(ArgNo, Macro, PP)[0];
else
ResultArgToks = ArgTok; // Use non-preexpanded tokens.
// If the arg token expanded into anything, append it.
if (ResultArgToks->isNot(tok::eof)) {
unsigned FirstResult = ResultToks.size();
unsigned NumToks = MacroArgs::getArgLength(ResultArgToks);
ResultToks.append(ResultArgToks, ResultArgToks+NumToks);
// If the '##' came from expanding an argument, turn it into 'unknown'
// to avoid pasting.
for (unsigned i = FirstResult, e = ResultToks.size(); i != e; ++i) {
Token &Tok = ResultToks[i];
if (Tok.is(tok::hashhash))
Tok.setKind(tok::unknown);
}
if(ExpandLocStart.isValid()) {
updateLocForMacroArgTokens(CurTok.getLocation(),
ResultToks.begin()+FirstResult,
ResultToks.end());
}
// If any tokens were substituted from the argument, the whitespace
// before the first token should match the whitespace of the arg
// identifier.
ResultToks[FirstResult].setFlagValue(Token::LeadingSpace,
CurTok.hasLeadingSpace() ||
NextTokGetsSpace);
NextTokGetsSpace = false;
} else {
// If this is an empty argument, and if there was whitespace before the
// formal token, make sure the next token gets whitespace before it.
NextTokGetsSpace = CurTok.hasLeadingSpace();
}
continue;
}
// Okay, we have a token that is either the LHS or RHS of a paste (##)
// argument. It gets substituted as its non-pre-expanded tokens.
const Token *ArgToks = ActualArgs->getUnexpArgument(ArgNo);
unsigned NumToks = MacroArgs::getArgLength(ArgToks);
if (NumToks) { // Not an empty argument?
// If this is the GNU ", ## __VA_ARGS__" extension, and we just learned
// that __VA_ARGS__ expands to multiple tokens, avoid a pasting error when
// the expander trys to paste ',' with the first token of the __VA_ARGS__
// expansion.
if (PasteBefore && ResultToks.size() >= 2 &&
ResultToks[ResultToks.size()-2].is(tok::comma) &&
(unsigned)ArgNo == Macro->getNumArgs()-1 &&
Macro->isVariadic()) {
// Remove the paste operator, report use of the extension.
PP.Diag(ResultToks.back().getLocation(), diag::ext_paste_comma);
ResultToks.pop_back();
}
ResultToks.append(ArgToks, ArgToks+NumToks);
// If the '##' came from expanding an argument, turn it into 'unknown'
// to avoid pasting.
for (unsigned i = ResultToks.size() - NumToks, e = ResultToks.size();
i != e; ++i) {
Token &Tok = ResultToks[i];
if (Tok.is(tok::hashhash))
Tok.setKind(tok::unknown);
}
if (ExpandLocStart.isValid()) {
updateLocForMacroArgTokens(CurTok.getLocation(),
ResultToks.end()-NumToks, ResultToks.end());
}
// If this token (the macro argument) was supposed to get leading
// whitespace, transfer this information onto the first token of the
// expansion.
//
// Do not do this if the paste operator occurs before the macro argument,
// as in "A ## MACROARG". In valid code, the first token will get
// smooshed onto the preceding one anyway (forming AMACROARG). In
// assembler-with-cpp mode, invalid pastes are allowed through: in this
// case, we do not want the extra whitespace to be added. For example,
// we want ". ## foo" -> ".foo" not ". foo".
if ((CurTok.hasLeadingSpace() || NextTokGetsSpace) &&
!PasteBefore)
ResultToks[ResultToks.size()-NumToks].setFlag(Token::LeadingSpace);
NextTokGetsSpace = false;
continue;
}
// If an empty argument is on the LHS or RHS of a paste, the standard (C99
// 6.10.3.3p2,3) calls for a bunch of placemarker stuff to occur. We
// implement this by eating ## operators when a LHS or RHS expands to
// empty.
NextTokGetsSpace |= CurTok.hasLeadingSpace();
if (PasteAfter) {
// Discard the argument token and skip (don't copy to the expansion
// buffer) the paste operator after it.
NextTokGetsSpace |= Tokens[i+1].hasLeadingSpace();
++i;
continue;
}
// If this is on the RHS of a paste operator, we've already copied the
// paste operator to the ResultToks list. Remove it.
assert(PasteBefore && ResultToks.back().is(tok::hashhash));
NextTokGetsSpace |= ResultToks.back().hasLeadingSpace();
ResultToks.pop_back();
// If this is the __VA_ARGS__ token, and if the argument wasn't provided,
// and if the macro had at least one real argument, and if the token before
// the ## was a comma, remove the comma.
if ((unsigned)ArgNo == Macro->getNumArgs()-1 && // is __VA_ARGS__
ActualArgs->isVarargsElidedUse() && // Argument elided.
!ResultToks.empty() && ResultToks.back().is(tok::comma)) {
// Never add a space, even if the comma, ##, or arg had a space.
NextTokGetsSpace = false;
// Remove the paste operator, report use of the extension.
PP.Diag(ResultToks.back().getLocation(), diag::ext_paste_comma);
ResultToks.pop_back();
// If the comma was right after another paste (e.g. "X##,##__VA_ARGS__"),
// then removal of the comma should produce a placemarker token (in C99
// terms) which we model by popping off the previous ##, giving us a plain
// "X" when __VA_ARGS__ is empty.
if (!ResultToks.empty() && ResultToks.back().is(tok::hashhash))
ResultToks.pop_back();
}
continue;
}
// If anything changed, install this as the new Tokens list.
if (MadeChange) {
assert(!OwnsTokens && "This would leak if we already own the token list");
// This is deleted in the dtor.
NumTokens = ResultToks.size();
// The tokens will be added to Preprocessor's cache and will be removed
// when this TokenLexer finishes lexing them.
Tokens = PP.cacheMacroExpandedTokens(this, ResultToks);
// The preprocessor cache of macro expanded tokens owns these tokens,not us.
OwnsTokens = false;
}
}
/// removeBlocks - Remove basic block DeadBB and all blocks dominated by DeadBB.
/// This routine is used to remove split condition's dead branch, dominated by
/// DeadBB. LiveBB dominates split conidition's other branch.
void LoopIndexSplit::removeBlocks(BasicBlock *DeadBB, Loop *LP,
BasicBlock *LiveBB) {
// First update DeadBB's dominance frontier.
SmallVector<BasicBlock *, 8> FrontierBBs;
DominanceFrontier::iterator DeadBBDF = DF->find(DeadBB);
if (DeadBBDF != DF->end()) {
SmallVector<BasicBlock *, 8> PredBlocks;
DominanceFrontier::DomSetType DeadBBSet = DeadBBDF->second;
for (DominanceFrontier::DomSetType::iterator DeadBBSetI = DeadBBSet.begin(),
DeadBBSetE = DeadBBSet.end(); DeadBBSetI != DeadBBSetE; ++DeadBBSetI)
{
BasicBlock *FrontierBB = *DeadBBSetI;
FrontierBBs.push_back(FrontierBB);
// Rremove any PHI incoming edge from blocks dominated by DeadBB.
PredBlocks.clear();
for(pred_iterator PI = pred_begin(FrontierBB), PE = pred_end(FrontierBB);
PI != PE; ++PI) {
BasicBlock *P = *PI;
if (P == DeadBB || DT->dominates(DeadBB, P))
PredBlocks.push_back(P);
}
for(BasicBlock::iterator FBI = FrontierBB->begin(), FBE = FrontierBB->end();
FBI != FBE; ++FBI) {
if (PHINode *PN = dyn_cast<PHINode>(FBI)) {
for(SmallVector<BasicBlock *, 8>::iterator PI = PredBlocks.begin(),
PE = PredBlocks.end(); PI != PE; ++PI) {
BasicBlock *P = *PI;
PN->removeIncomingValue(P);
}
}
else
break;
}
}
}
// Now remove DeadBB and all nodes dominated by DeadBB in df order.
SmallVector<BasicBlock *, 32> WorkList;
DomTreeNode *DN = DT->getNode(DeadBB);
for (df_iterator<DomTreeNode*> DI = df_begin(DN),
E = df_end(DN); DI != E; ++DI) {
BasicBlock *BB = DI->getBlock();
WorkList.push_back(BB);
BB->replaceAllUsesWith(UndefValue::get(
Type::getLabelTy(DeadBB->getContext())));
}
while (!WorkList.empty()) {
BasicBlock *BB = WorkList.back(); WorkList.pop_back();
LPM->deleteSimpleAnalysisValue(BB, LP);
for(BasicBlock::iterator BBI = BB->begin(), BBE = BB->end();
BBI != BBE; ) {
Instruction *I = BBI;
++BBI;
I->replaceAllUsesWith(UndefValue::get(I->getType()));
LPM->deleteSimpleAnalysisValue(I, LP);
I->eraseFromParent();
}
DT->eraseNode(BB);
DF->removeBlock(BB);
LI->removeBlock(BB);
BB->eraseFromParent();
}
// Update Frontier BBs' dominator info.
while (!FrontierBBs.empty()) {
BasicBlock *FBB = FrontierBBs.back(); FrontierBBs.pop_back();
BasicBlock *NewDominator = FBB->getSinglePredecessor();
if (!NewDominator) {
pred_iterator PI = pred_begin(FBB), PE = pred_end(FBB);
NewDominator = *PI;
++PI;
if (NewDominator != LiveBB) {
for(; PI != PE; ++PI) {
BasicBlock *P = *PI;
if (P == LiveBB) {
NewDominator = LiveBB;
break;
}
NewDominator = DT->findNearestCommonDominator(NewDominator, P);
}
}
}
assert (NewDominator && "Unable to fix dominator info.");
DT->changeImmediateDominator(FBB, NewDominator);
DF->changeImmediateDominator(FBB, NewDominator, DT);
}
}
/// getNonLocalCallDependency - Perform a full dependency query for the
/// specified call, returning the set of blocks that the value is
/// potentially live across. The returned set of results will include a
/// "NonLocal" result for all blocks where the value is live across.
///
/// This method assumes the instruction returns a "NonLocal" dependency
/// within its own block.
///
/// This returns a reference to an internal data structure that may be
/// invalidated on the next non-local query or when an instruction is
/// removed. Clients must copy this data if they want it around longer than
/// that.
const MemoryDependenceAnalysis::NonLocalDepInfo &
MemoryDependenceAnalysis::getNonLocalCallDependency(CallSite QueryCS) {
assert(getDependency(QueryCS.getInstruction()).isNonLocal() &&
"getNonLocalCallDependency should only be used on calls with non-local deps!");
PerInstNLInfo &CacheP = NonLocalDeps[QueryCS.getInstruction()];
NonLocalDepInfo &Cache = CacheP.first;
/// DirtyBlocks - This is the set of blocks that need to be recomputed. In
/// the cached case, this can happen due to instructions being deleted etc. In
/// the uncached case, this starts out as the set of predecessors we care
/// about.
SmallVector<BasicBlock*, 32> DirtyBlocks;
if (!Cache.empty()) {
// Okay, we have a cache entry. If we know it is not dirty, just return it
// with no computation.
if (!CacheP.second) {
NumCacheNonLocal++;
return Cache;
}
// If we already have a partially computed set of results, scan them to
// determine what is dirty, seeding our initial DirtyBlocks worklist.
for (NonLocalDepInfo::iterator I = Cache.begin(), E = Cache.end();
I != E; ++I)
if (I->second.isDirty())
DirtyBlocks.push_back(I->first);
// Sort the cache so that we can do fast binary search lookups below.
std::sort(Cache.begin(), Cache.end());
++NumCacheDirtyNonLocal;
//cerr << "CACHED CASE: " << DirtyBlocks.size() << " dirty: "
// << Cache.size() << " cached: " << *QueryInst;
} else {
// Seed DirtyBlocks with each of the preds of QueryInst's block.
BasicBlock *QueryBB = QueryCS.getInstruction()->getParent();
for (BasicBlock **PI = PredCache->GetPreds(QueryBB); *PI; ++PI)
DirtyBlocks.push_back(*PI);
NumUncacheNonLocal++;
}
// isReadonlyCall - If this is a read-only call, we can be more aggressive.
bool isReadonlyCall = AA->onlyReadsMemory(QueryCS);
SmallPtrSet<BasicBlock*, 64> Visited;
unsigned NumSortedEntries = Cache.size();
DEBUG(AssertSorted(Cache));
// Iterate while we still have blocks to update.
while (!DirtyBlocks.empty()) {
BasicBlock *DirtyBB = DirtyBlocks.back();
DirtyBlocks.pop_back();
// Already processed this block?
if (!Visited.insert(DirtyBB))
continue;
// Do a binary search to see if we already have an entry for this block in
// the cache set. If so, find it.
DEBUG(AssertSorted(Cache, NumSortedEntries));
NonLocalDepInfo::iterator Entry =
std::upper_bound(Cache.begin(), Cache.begin()+NumSortedEntries,
std::make_pair(DirtyBB, MemDepResult()));
if (Entry != Cache.begin() && prior(Entry)->first == DirtyBB)
--Entry;
MemDepResult *ExistingResult = 0;
if (Entry != Cache.begin()+NumSortedEntries &&
Entry->first == DirtyBB) {
// If we already have an entry, and if it isn't already dirty, the block
// is done.
if (!Entry->second.isDirty())
continue;
// Otherwise, remember this slot so we can update the value.
ExistingResult = &Entry->second;
}
// If the dirty entry has a pointer, start scanning from it so we don't have
// to rescan the entire block.
BasicBlock::iterator ScanPos = DirtyBB->end();
if (ExistingResult) {
if (Instruction *Inst = ExistingResult->getInst()) {
ScanPos = Inst;
// We're removing QueryInst's use of Inst.
RemoveFromReverseMap(ReverseNonLocalDeps, Inst,
QueryCS.getInstruction());
}
}
// Find out if this block has a local dependency for QueryInst.
MemDepResult Dep;
if (ScanPos != DirtyBB->begin()) {
Dep = getCallSiteDependencyFrom(QueryCS, isReadonlyCall,ScanPos, DirtyBB);
} else if (DirtyBB != &DirtyBB->getParent()->getEntryBlock()) {
// No dependence found. If this is the entry block of the function, it is
// a clobber, otherwise it is non-local.
Dep = MemDepResult::getNonLocal();
} else {
Dep = MemDepResult::getClobber(ScanPos);
}
// If we had a dirty entry for the block, update it. Otherwise, just add
// a new entry.
if (ExistingResult)
*ExistingResult = Dep;
else
Cache.push_back(std::make_pair(DirtyBB, Dep));
// If the block has a dependency (i.e. it isn't completely transparent to
// the value), remember the association!
if (!Dep.isNonLocal()) {
// Keep the ReverseNonLocalDeps map up to date so we can efficiently
// update this when we remove instructions.
if (Instruction *Inst = Dep.getInst())
ReverseNonLocalDeps[Inst].insert(QueryCS.getInstruction());
} else {
// If the block *is* completely transparent to the load, we need to check
// the predecessors of this block. Add them to our worklist.
for (BasicBlock **PI = PredCache->GetPreds(DirtyBB); *PI; ++PI)
DirtyBlocks.push_back(*PI);
}
}
return Cache;
}
SourceCompleteResult
ide::isSourceInputComplete(std::unique_ptr<llvm::MemoryBuffer> MemBuf) {
SourceManager SM;
auto BufferID = SM.addNewSourceBuffer(std::move(MemBuf));
ParserUnit Parse(SM, BufferID);
Parser &P = Parse.getParser();
bool Done;
do {
P.parseTopLevel();
Done = P.Tok.is(tok::eof);
} while (!Done);
SourceCompleteResult SCR;
SCR.IsComplete = !P.isInputIncomplete();
// Use the same code that was in the REPL code to track the indent level
// for now. In the future we should get this from the Parser if possible.
CharSourceRange entireRange = SM.getRangeForBuffer(BufferID);
StringRef Buffer = SM.extractText(entireRange);
const char *SourceStart = Buffer.data();
const char *SourceEnd = Buffer.data() + Buffer.size();
const char *LineStart = SourceStart;
const char *LineSourceStart = nullptr;
uint32_t LineIndent = 0;
struct IndentInfo {
StringRef Prefix;
uint32_t Indent;
IndentInfo(const char *s, size_t n, uint32_t i) :
Prefix(s, n),
Indent(i) {}
};
SmallVector<IndentInfo, 4> IndentInfos;
for (const char *p = SourceStart; p<SourceEnd; ++p) {
switch (*p) {
case '\r':
case '\n':
LineIndent = 0;
LineSourceStart = nullptr;
LineStart = p + 1;
break;
case '"':
p = skipStringInCode (p, SourceEnd);
break;
case '{':
case '(':
case '[':
++LineIndent;
if (LineSourceStart == nullptr)
IndentInfos.push_back(IndentInfo(LineStart,
p - LineStart,
LineIndent));
else
IndentInfos.push_back(IndentInfo(LineStart,
LineSourceStart - LineStart,
LineIndent));
break;
case '}':
case ')':
case ']':
if (LineIndent > 0)
--LineIndent;
if (!IndentInfos.empty())
IndentInfos.pop_back();
break;
default:
if (LineSourceStart == nullptr && !isspace(*p))
LineSourceStart = p;
break;
}
if (*p == '\0')
break;
}
if (!IndentInfos.empty()) {
SCR.IndentPrefix = IndentInfos.back().Prefix.str();
// Trim off anything that follows a non-space character
const size_t pos = SCR.IndentPrefix.find_first_not_of(" \t");
if (pos != std::string::npos)
SCR.IndentPrefix.erase(pos);
SCR.IndentLevel = IndentInfos.back().Indent;
}
return SCR;
}
/// lowerAcrossUnwindEdges - Find all variables which are alive across an unwind
/// edge and spill them.
void SjLjEHPrepare::lowerAcrossUnwindEdges(Function &F,
ArrayRef<InvokeInst *> Invokes) {
// Finally, scan the code looking for instructions with bad live ranges.
for (Function::iterator BB = F.begin(), BBE = F.end(); BB != BBE; ++BB) {
for (BasicBlock::iterator II = BB->begin(), IIE = BB->end(); II != IIE;
++II) {
// Ignore obvious cases we don't have to handle. In particular, most
// instructions either have no uses or only have a single use inside the
// current block. Ignore them quickly.
Instruction *Inst = &*II;
if (Inst->use_empty())
continue;
if (Inst->hasOneUse() &&
cast<Instruction>(Inst->user_back())->getParent() == BB &&
!isa<PHINode>(Inst->user_back()))
continue;
// If this is an alloca in the entry block, it's not a real register
// value.
if (AllocaInst *AI = dyn_cast<AllocaInst>(Inst))
if (isa<ConstantInt>(AI->getArraySize()) && BB == F.begin())
continue;
// Avoid iterator invalidation by copying users to a temporary vector.
SmallVector<Instruction *, 16> Users;
for (User *U : Inst->users()) {
Instruction *UI = cast<Instruction>(U);
if (UI->getParent() != BB || isa<PHINode>(UI))
Users.push_back(UI);
}
// Find all of the blocks that this value is live in.
SmallPtrSet<BasicBlock *, 64> LiveBBs;
LiveBBs.insert(Inst->getParent());
while (!Users.empty()) {
Instruction *U = Users.back();
Users.pop_back();
if (!isa<PHINode>(U)) {
MarkBlocksLiveIn(U->getParent(), LiveBBs);
} else {
// Uses for a PHI node occur in their predecessor block.
PHINode *PN = cast<PHINode>(U);
for (unsigned i = 0, e = PN->getNumIncomingValues(); i != e; ++i)
if (PN->getIncomingValue(i) == Inst)
MarkBlocksLiveIn(PN->getIncomingBlock(i), LiveBBs);
}
}
// Now that we know all of the blocks that this thing is live in, see if
// it includes any of the unwind locations.
bool NeedsSpill = false;
for (unsigned i = 0, e = Invokes.size(); i != e; ++i) {
BasicBlock *UnwindBlock = Invokes[i]->getUnwindDest();
if (UnwindBlock != BB && LiveBBs.count(UnwindBlock)) {
DEBUG(dbgs() << "SJLJ Spill: " << *Inst << " around "
<< UnwindBlock->getName() << "\n");
NeedsSpill = true;
break;
}
}
// If we decided we need a spill, do it.
// FIXME: Spilling this way is overkill, as it forces all uses of
// the value to be reloaded from the stack slot, even those that aren't
// in the unwind blocks. We should be more selective.
if (NeedsSpill) {
DemoteRegToStack(*Inst, true);
++NumSpilled;
}
}
}
// Go through the landing pads and remove any PHIs there.
for (unsigned i = 0, e = Invokes.size(); i != e; ++i) {
BasicBlock *UnwindBlock = Invokes[i]->getUnwindDest();
LandingPadInst *LPI = UnwindBlock->getLandingPadInst();
// Place PHIs into a set to avoid invalidating the iterator.
SmallPtrSet<PHINode *, 8> PHIsToDemote;
for (BasicBlock::iterator PN = UnwindBlock->begin(); isa<PHINode>(PN); ++PN)
PHIsToDemote.insert(cast<PHINode>(PN));
if (PHIsToDemote.empty())
continue;
// Demote the PHIs to the stack.
for (PHINode *PN : PHIsToDemote)
DemotePHIToStack(PN);
// Move the landingpad instruction back to the top of the landing pad block.
LPI->moveBefore(&UnwindBlock->front());
}
}
/// shrinkToUses - After removing some uses of a register, shrink its live
/// range to just the remaining uses. This method does not compute reaching
/// defs for new uses, and it doesn't remove dead defs.
bool LiveIntervals::shrinkToUses(LiveInterval *li,
SmallVectorImpl<MachineInstr*> *dead) {
DEBUG(dbgs() << "Shrink: " << *li << '\n');
assert(TargetRegisterInfo::isVirtualRegister(li->reg)
&& "Can only shrink virtual registers");
// Find all the values used, including PHI kills.
SmallVector<std::pair<SlotIndex, VNInfo*>, 16> WorkList;
// Blocks that have already been added to WorkList as live-out.
SmallPtrSet<MachineBasicBlock*, 16> LiveOut;
// Visit all instructions reading li->reg.
for (MachineRegisterInfo::reg_iterator I = MRI->reg_begin(li->reg);
MachineInstr *UseMI = I.skipInstruction();) {
if (UseMI->isDebugValue() || !UseMI->readsVirtualRegister(li->reg))
continue;
SlotIndex Idx = getInstructionIndex(UseMI).getRegSlot();
LiveRangeQuery LRQ(*li, Idx);
VNInfo *VNI = LRQ.valueIn();
if (!VNI) {
// This shouldn't happen: readsVirtualRegister returns true, but there is
// no live value. It is likely caused by a target getting <undef> flags
// wrong.
DEBUG(dbgs() << Idx << '\t' << *UseMI
<< "Warning: Instr claims to read non-existent value in "
<< *li << '\n');
continue;
}
// Special case: An early-clobber tied operand reads and writes the
// register one slot early.
if (VNInfo *DefVNI = LRQ.valueDefined())
Idx = DefVNI->def;
WorkList.push_back(std::make_pair(Idx, VNI));
}
// Create a new live interval with only minimal live segments per def.
LiveInterval NewLI(li->reg, 0);
for (LiveInterval::vni_iterator I = li->vni_begin(), E = li->vni_end();
I != E; ++I) {
VNInfo *VNI = *I;
if (VNI->isUnused())
continue;
NewLI.addRange(LiveRange(VNI->def, VNI->def.getDeadSlot(), VNI));
}
// Keep track of the PHIs that are in use.
SmallPtrSet<VNInfo*, 8> UsedPHIs;
// Extend intervals to reach all uses in WorkList.
while (!WorkList.empty()) {
SlotIndex Idx = WorkList.back().first;
VNInfo *VNI = WorkList.back().second;
WorkList.pop_back();
const MachineBasicBlock *MBB = getMBBFromIndex(Idx.getPrevSlot());
SlotIndex BlockStart = getMBBStartIdx(MBB);
// Extend the live range for VNI to be live at Idx.
if (VNInfo *ExtVNI = NewLI.extendInBlock(BlockStart, Idx)) {
(void)ExtVNI;
assert(ExtVNI == VNI && "Unexpected existing value number");
// Is this a PHIDef we haven't seen before?
if (!VNI->isPHIDef() || VNI->def != BlockStart || !UsedPHIs.insert(VNI))
continue;
// The PHI is live, make sure the predecessors are live-out.
for (MachineBasicBlock::const_pred_iterator PI = MBB->pred_begin(),
PE = MBB->pred_end(); PI != PE; ++PI) {
if (!LiveOut.insert(*PI))
continue;
SlotIndex Stop = getMBBEndIdx(*PI);
// A predecessor is not required to have a live-out value for a PHI.
if (VNInfo *PVNI = li->getVNInfoBefore(Stop))
WorkList.push_back(std::make_pair(Stop, PVNI));
}
continue;
}
// VNI is live-in to MBB.
DEBUG(dbgs() << " live-in at " << BlockStart << '\n');
NewLI.addRange(LiveRange(BlockStart, Idx, VNI));
// Make sure VNI is live-out from the predecessors.
for (MachineBasicBlock::const_pred_iterator PI = MBB->pred_begin(),
PE = MBB->pred_end(); PI != PE; ++PI) {
if (!LiveOut.insert(*PI))
continue;
SlotIndex Stop = getMBBEndIdx(*PI);
assert(li->getVNInfoBefore(Stop) == VNI &&
"Wrong value out of predecessor");
WorkList.push_back(std::make_pair(Stop, VNI));
}
}
// Handle dead values.
bool CanSeparate = false;
for (LiveInterval::vni_iterator I = li->vni_begin(), E = li->vni_end();
I != E; ++I) {
VNInfo *VNI = *I;
if (VNI->isUnused())
continue;
LiveInterval::iterator LII = NewLI.FindLiveRangeContaining(VNI->def);
assert(LII != NewLI.end() && "Missing live range for PHI");
if (LII->end != VNI->def.getDeadSlot())
continue;
if (VNI->isPHIDef()) {
// This is a dead PHI. Remove it.
VNI->markUnused();
NewLI.removeRange(*LII);
DEBUG(dbgs() << "Dead PHI at " << VNI->def << " may separate interval\n");
CanSeparate = true;
} else {
// This is a dead def. Make sure the instruction knows.
MachineInstr *MI = getInstructionFromIndex(VNI->def);
assert(MI && "No instruction defining live value");
MI->addRegisterDead(li->reg, TRI);
if (dead && MI->allDefsAreDead()) {
DEBUG(dbgs() << "All defs dead: " << VNI->def << '\t' << *MI);
dead->push_back(MI);
}
}
}
// Move the trimmed ranges back.
li->ranges.swap(NewLI.ranges);
DEBUG(dbgs() << "Shrunk: " << *li << '\n');
return CanSeparate;
}
// MI is known to be dead. Figure out what instructions
// are also made dead by this and mark them for removal.
void A15SDOptimizer::eraseInstrWithNoUses(MachineInstr *MI) {
SmallVector<MachineInstr *, 8> Front;
DeadInstr.insert(MI);
DEBUG(dbgs() << "Deleting base instruction " << *MI << "\n");
Front.push_back(MI);
while (Front.size() != 0) {
MI = Front.back();
Front.pop_back();
// MI is already known to be dead. We need to see
// if other instructions can also be removed.
for (unsigned int i = 0; i < MI->getNumOperands(); ++i) {
MachineOperand &MO = MI->getOperand(i);
if ((!MO.isReg()) || (!MO.isUse()))
continue;
unsigned Reg = MO.getReg();
if (!TRI->isVirtualRegister(Reg))
continue;
MachineOperand *Op = MI->findRegisterDefOperand(Reg);
if (!Op)
continue;
MachineInstr *Def = Op->getParent();
// We don't need to do anything if we have already marked
// this instruction as being dead.
if (DeadInstr.find(Def) != DeadInstr.end())
continue;
// Check if all the uses of this instruction are marked as
// dead. If so, we can also mark this instruction as being
// dead.
bool IsDead = true;
for (unsigned int j = 0; j < Def->getNumOperands(); ++j) {
MachineOperand &MODef = Def->getOperand(j);
if ((!MODef.isReg()) || (!MODef.isDef()))
continue;
unsigned DefReg = MODef.getReg();
if (!TRI->isVirtualRegister(DefReg)) {
IsDead = false;
break;
}
for (MachineRegisterInfo::use_instr_iterator
II = MRI->use_instr_begin(Reg), EE = MRI->use_instr_end();
II != EE; ++II) {
// We don't care about self references.
if (&*II == Def)
continue;
if (DeadInstr.find(&*II) == DeadInstr.end()) {
IsDead = false;
break;
}
}
}
if (!IsDead) continue;
DEBUG(dbgs() << "Deleting instruction " << *Def << "\n");
DeadInstr.insert(Def);
}
}
}
void UnwrappedLineParser::calculateBraceTypes() {
// We'll parse forward through the tokens until we hit
// a closing brace or eof - note that getNextToken() will
// parse macros, so this will magically work inside macro
// definitions, too.
unsigned StoredPosition = Tokens->getPosition();
unsigned Position = StoredPosition;
FormatToken *Tok = FormatTok;
// Keep a stack of positions of lbrace tokens. We will
// update information about whether an lbrace starts a
// braced init list or a different block during the loop.
SmallVector<FormatToken *, 8> LBraceStack;
assert(Tok->Tok.is(tok::l_brace));
do {
// Get next none-comment token.
FormatToken *NextTok;
unsigned ReadTokens = 0;
do {
NextTok = Tokens->getNextToken();
++ReadTokens;
} while (NextTok->is(tok::comment));
switch (Tok->Tok.getKind()) {
case tok::l_brace:
LBraceStack.push_back(Tok);
break;
case tok::r_brace:
if (!LBraceStack.empty()) {
if (LBraceStack.back()->BlockKind == BK_Unknown) {
bool ProbablyBracedList = false;
if (Style.Language == FormatStyle::LK_Proto) {
ProbablyBracedList = NextTok->isOneOf(tok::comma, tok::r_square);
} else {
// Using OriginalColumn to distinguish between ObjC methods and
// binary operators is a bit hacky.
bool NextIsObjCMethod = NextTok->isOneOf(tok::plus, tok::minus) &&
NextTok->OriginalColumn == 0;
// If there is a comma, semicolon or right paren after the closing
// brace, we assume this is a braced initializer list. Note that
// regardless how we mark inner braces here, we will overwrite the
// BlockKind later if we parse a braced list (where all blocks
// inside are by default braced lists), or when we explicitly detect
// blocks (for example while parsing lambdas).
//
// We exclude + and - as they can be ObjC visibility modifiers.
ProbablyBracedList =
NextTok->isOneOf(tok::comma, tok::semi, tok::period, tok::colon,
tok::r_paren, tok::r_square, tok::l_brace,
tok::l_paren) ||
(NextTok->isBinaryOperator() && !NextIsObjCMethod);
}
if (ProbablyBracedList) {
Tok->BlockKind = BK_BracedInit;
LBraceStack.back()->BlockKind = BK_BracedInit;
} else {
Tok->BlockKind = BK_Block;
LBraceStack.back()->BlockKind = BK_Block;
}
}
LBraceStack.pop_back();
}
break;
case tok::at:
case tok::semi:
case tok::kw_if:
case tok::kw_while:
case tok::kw_for:
case tok::kw_switch:
case tok::kw_try:
if (!LBraceStack.empty())
LBraceStack.back()->BlockKind = BK_Block;
break;
default:
break;
}
Tok = NextTok;
Position += ReadTokens;
} while (Tok->Tok.isNot(tok::eof) && !LBraceStack.empty());
// Assume other blocks for all unclosed opening braces.
for (unsigned i = 0, e = LBraceStack.size(); i != e; ++i) {
if (LBraceStack[i]->BlockKind == BK_Unknown)
LBraceStack[i]->BlockKind = BK_Block;
}
FormatTok = Tokens->setPosition(StoredPosition);
}
/// ActOnEndOfTranslationUnit - This is called at the very end of the
/// translation unit when EOF is reached and all but the top-level scope is
/// popped.
void Sema::ActOnEndOfTranslationUnit() {
assert(DelayedDiagnostics.getCurrentPool() == NULL
&& "reached end of translation unit with a pool attached?");
// If code completion is enabled, don't perform any end-of-translation-unit
// work.
if (PP.isCodeCompletionEnabled())
return;
// Only complete translation units define vtables and perform implicit
// instantiations.
if (TUKind == TU_Complete) {
DiagnoseUseOfUnimplementedSelectors();
// If any dynamic classes have their key function defined within
// this translation unit, then those vtables are considered "used" and must
// be emitted.
for (DynamicClassesType::iterator I = DynamicClasses.begin(ExternalSource),
E = DynamicClasses.end();
I != E; ++I) {
assert(!(*I)->isDependentType() &&
"Should not see dependent types here!");
if (const CXXMethodDecl *KeyFunction = Context.getCurrentKeyFunction(*I)) {
const FunctionDecl *Definition = 0;
if (KeyFunction->hasBody(Definition))
MarkVTableUsed(Definition->getLocation(), *I, true);
}
}
// If DefinedUsedVTables ends up marking any virtual member functions it
// might lead to more pending template instantiations, which we then need
// to instantiate.
DefineUsedVTables();
// C++: Perform implicit template instantiations.
//
// FIXME: When we perform these implicit instantiations, we do not
// carefully keep track of the point of instantiation (C++ [temp.point]).
// This means that name lookup that occurs within the template
// instantiation will always happen at the end of the translation unit,
// so it will find some names that should not be found. Although this is
// common behavior for C++ compilers, it is technically wrong. In the
// future, we either need to be able to filter the results of name lookup
// or we need to perform template instantiations earlier.
PerformPendingInstantiations();
}
// Remove file scoped decls that turned out to be used.
UnusedFileScopedDecls.erase(std::remove_if(UnusedFileScopedDecls.begin(0,
true),
UnusedFileScopedDecls.end(),
std::bind1st(std::ptr_fun(ShouldRemoveFromUnused),
this)),
UnusedFileScopedDecls.end());
if (TUKind == TU_Prefix) {
// Translation unit prefixes don't need any of the checking below.
TUScope = 0;
return;
}
// Check for #pragma weak identifiers that were never declared
// FIXME: This will cause diagnostics to be emitted in a non-determinstic
// order! Iterating over a densemap like this is bad.
LoadExternalWeakUndeclaredIdentifiers();
for (llvm::DenseMap<IdentifierInfo*,WeakInfo>::iterator
I = WeakUndeclaredIdentifiers.begin(),
E = WeakUndeclaredIdentifiers.end(); I != E; ++I) {
if (I->second.getUsed()) continue;
Diag(I->second.getLocation(), diag::warn_weak_identifier_undeclared)
<< I->first;
}
if (LangOpts.CPlusPlus11 &&
Diags.getDiagnosticLevel(diag::warn_delegating_ctor_cycle,
SourceLocation())
!= DiagnosticsEngine::Ignored)
CheckDelegatingCtorCycles();
if (TUKind == TU_Module) {
// If we are building a module, resolve all of the exported declarations
// now.
if (Module *CurrentModule = PP.getCurrentModule()) {
ModuleMap &ModMap = PP.getHeaderSearchInfo().getModuleMap();
SmallVector<Module *, 2> Stack;
Stack.push_back(CurrentModule);
while (!Stack.empty()) {
Module *Mod = Stack.back();
Stack.pop_back();
// Resolve the exported declarations and conflicts.
// FIXME: Actually complain, once we figure out how to teach the
// diagnostic client to deal with complaints in the module map at this
// point.
ModMap.resolveExports(Mod, /*Complain=*/false);
ModMap.resolveConflicts(Mod, /*Complain=*/false);
// Queue the submodules, so their exports will also be resolved.
for (Module::submodule_iterator Sub = Mod->submodule_begin(),
SubEnd = Mod->submodule_end();
Sub != SubEnd; ++Sub) {
Stack.push_back(*Sub);
}
}
}
// Modules don't need any of the checking below.
TUScope = 0;
return;
}
// C99 6.9.2p2:
// A declaration of an identifier for an object that has file
// scope without an initializer, and without a storage-class
// specifier or with the storage-class specifier static,
// constitutes a tentative definition. If a translation unit
// contains one or more tentative definitions for an identifier,
// and the translation unit contains no external definition for
// that identifier, then the behavior is exactly as if the
// translation unit contains a file scope declaration of that
// identifier, with the composite type as of the end of the
// translation unit, with an initializer equal to 0.
llvm::SmallSet<VarDecl *, 32> Seen;
for (TentativeDefinitionsType::iterator
T = TentativeDefinitions.begin(ExternalSource),
TEnd = TentativeDefinitions.end();
T != TEnd; ++T)
{
VarDecl *VD = (*T)->getActingDefinition();
// If the tentative definition was completed, getActingDefinition() returns
// null. If we've already seen this variable before, insert()'s second
// return value is false.
if (VD == 0 || VD->isInvalidDecl() || !Seen.insert(VD))
continue;
if (const IncompleteArrayType *ArrayT
= Context.getAsIncompleteArrayType(VD->getType())) {
if (RequireCompleteType(VD->getLocation(),
ArrayT->getElementType(),
diag::err_tentative_def_incomplete_type_arr)) {
VD->setInvalidDecl();
continue;
}
// Set the length of the array to 1 (C99 6.9.2p5).
Diag(VD->getLocation(), diag::warn_tentative_incomplete_array);
llvm::APInt One(Context.getTypeSize(Context.getSizeType()), true);
QualType T = Context.getConstantArrayType(ArrayT->getElementType(),
One, ArrayType::Normal, 0);
VD->setType(T);
} else if (RequireCompleteType(VD->getLocation(), VD->getType(),
diag::err_tentative_def_incomplete_type))
VD->setInvalidDecl();
CheckCompleteVariableDeclaration(VD);
// Notify the consumer that we've completed a tentative definition.
if (!VD->isInvalidDecl())
Consumer.CompleteTentativeDefinition(VD);
}
// If there were errors, disable 'unused' warnings since they will mostly be
// noise.
if (!Diags.hasErrorOccurred()) {
// Output warning for unused file scoped decls.
for (UnusedFileScopedDeclsType::iterator
I = UnusedFileScopedDecls.begin(ExternalSource),
E = UnusedFileScopedDecls.end(); I != E; ++I) {
if (ShouldRemoveFromUnused(this, *I))
continue;
if (const FunctionDecl *FD = dyn_cast<FunctionDecl>(*I)) {
const FunctionDecl *DiagD;
if (!FD->hasBody(DiagD))
DiagD = FD;
if (DiagD->isDeleted())
continue; // Deleted functions are supposed to be unused.
if (DiagD->isReferenced()) {
if (isa<CXXMethodDecl>(DiagD))
Diag(DiagD->getLocation(), diag::warn_unneeded_member_function)
<< DiagD->getDeclName();
else {
if (FD->getStorageClassAsWritten() == SC_Static &&
!FD->isInlineSpecified() &&
!SourceMgr.isFromMainFile(
SourceMgr.getExpansionLoc(FD->getLocation())))
Diag(DiagD->getLocation(), diag::warn_unneeded_static_internal_decl)
<< DiagD->getDeclName();
else
Diag(DiagD->getLocation(), diag::warn_unneeded_internal_decl)
<< /*function*/0 << DiagD->getDeclName();
}
} else {
Diag(DiagD->getLocation(),
isa<CXXMethodDecl>(DiagD) ? diag::warn_unused_member_function
: diag::warn_unused_function)
<< DiagD->getDeclName();
}
} else {
const VarDecl *DiagD = cast<VarDecl>(*I)->getDefinition();
if (!DiagD)
DiagD = cast<VarDecl>(*I);
if (DiagD->isReferenced()) {
Diag(DiagD->getLocation(), diag::warn_unneeded_internal_decl)
<< /*variable*/1 << DiagD->getDeclName();
} else {
Diag(DiagD->getLocation(), diag::warn_unused_variable)
<< DiagD->getDeclName();
}
}
}
if (ExternalSource)
ExternalSource->ReadUndefinedButUsed(UndefinedButUsed);
checkUndefinedButUsed(*this);
}
if (Diags.getDiagnosticLevel(diag::warn_unused_private_field,
SourceLocation())
!= DiagnosticsEngine::Ignored) {
RecordCompleteMap RecordsComplete;
RecordCompleteMap MNCComplete;
for (NamedDeclSetType::iterator I = UnusedPrivateFields.begin(),
E = UnusedPrivateFields.end(); I != E; ++I) {
const NamedDecl *D = *I;
const CXXRecordDecl *RD = dyn_cast<CXXRecordDecl>(D->getDeclContext());
if (RD && !RD->isUnion() &&
IsRecordFullyDefined(RD, RecordsComplete, MNCComplete)) {
Diag(D->getLocation(), diag::warn_unused_private_field)
<< D->getDeclName();
}
}
}
// Check we've noticed that we're no longer parsing the initializer for every
// variable. If we miss cases, then at best we have a performance issue and
// at worst a rejects-valid bug.
assert(ParsingInitForAutoVars.empty() &&
"Didn't unmark var as having its initializer parsed");
TUScope = 0;
}
/// SplitCriticalEdge - If this edge is a critical edge, insert a new node to
/// split the critical edge. This will update DominatorTree and
/// DominatorFrontier information if it is available, thus calling this pass
/// will not invalidate either of them. This returns the new block if the edge
/// was split, null otherwise.
///
/// If MergeIdenticalEdges is true (not the default), *all* edges from TI to the
/// specified successor will be merged into the same critical edge block.
/// This is most commonly interesting with switch instructions, which may
/// have many edges to any one destination. This ensures that all edges to that
/// dest go to one block instead of each going to a different block, but isn't
/// the standard definition of a "critical edge".
///
/// It is invalid to call this function on a critical edge that starts at an
/// IndirectBrInst. Splitting these edges will almost always create an invalid
/// program because the address of the new block won't be the one that is jumped
/// to.
///
BasicBlock *llvm::SplitCriticalEdge(TerminatorInst *TI, unsigned SuccNum,
Pass *P, bool MergeIdenticalEdges) {
if (!isCriticalEdge(TI, SuccNum, MergeIdenticalEdges)) return 0;
assert(!isa<IndirectBrInst>(TI) &&
"Cannot split critical edge from IndirectBrInst");
BasicBlock *TIBB = TI->getParent();
BasicBlock *DestBB = TI->getSuccessor(SuccNum);
// Create a new basic block, linking it into the CFG.
BasicBlock *NewBB = BasicBlock::Create(TI->getContext(),
TIBB->getName() + "." + DestBB->getName() + "_crit_edge");
// Create our unconditional branch.
BranchInst::Create(DestBB, NewBB);
// Branch to the new block, breaking the edge.
TI->setSuccessor(SuccNum, NewBB);
// Insert the block into the function... right after the block TI lives in.
Function &F = *TIBB->getParent();
Function::iterator FBBI = TIBB;
F.getBasicBlockList().insert(++FBBI, NewBB);
// If there are any PHI nodes in DestBB, we need to update them so that they
// merge incoming values from NewBB instead of from TIBB.
if (PHINode *APHI = dyn_cast<PHINode>(DestBB->begin())) {
// This conceptually does:
// foreach (PHINode *PN in DestBB)
// PN->setIncomingBlock(PN->getIncomingBlock(TIBB), NewBB);
// but is optimized for two cases.
if (APHI->getNumIncomingValues() <= 8) { // Small # preds case.
unsigned BBIdx = 0;
for (BasicBlock::iterator I = DestBB->begin(); isa<PHINode>(I); ++I) {
// We no longer enter through TIBB, now we come in through NewBB.
// Revector exactly one entry in the PHI node that used to come from
// TIBB to come from NewBB.
PHINode *PN = cast<PHINode>(I);
// Reuse the previous value of BBIdx if it lines up. In cases where we
// have multiple phi nodes with *lots* of predecessors, this is a speed
// win because we don't have to scan the PHI looking for TIBB. This
// happens because the BB list of PHI nodes are usually in the same
// order.
if (PN->getIncomingBlock(BBIdx) != TIBB)
BBIdx = PN->getBasicBlockIndex(TIBB);
PN->setIncomingBlock(BBIdx, NewBB);
}
} else {
// However, the foreach loop is slow for blocks with lots of predecessors
// because PHINode::getIncomingBlock is O(n) in # preds. Instead, walk
// the user list of TIBB to find the PHI nodes.
SmallPtrSet<PHINode*, 16> UpdatedPHIs;
for (Value::use_iterator UI = TIBB->use_begin(), E = TIBB->use_end();
UI != E; ) {
Value::use_iterator Use = UI++;
if (PHINode *PN = dyn_cast<PHINode>(Use)) {
// Remove one entry from each PHI.
if (PN->getParent() == DestBB && UpdatedPHIs.insert(PN))
PN->setOperand(Use.getOperandNo(), NewBB);
}
}
}
}
// If there are any other edges from TIBB to DestBB, update those to go
// through the split block, making those edges non-critical as well (and
// reducing the number of phi entries in the DestBB if relevant).
if (MergeIdenticalEdges) {
for (unsigned i = SuccNum+1, e = TI->getNumSuccessors(); i != e; ++i) {
if (TI->getSuccessor(i) != DestBB) continue;
// Remove an entry for TIBB from DestBB phi nodes.
DestBB->removePredecessor(TIBB);
// We found another edge to DestBB, go to NewBB instead.
TI->setSuccessor(i, NewBB);
}
}
// If we don't have a pass object, we can't update anything...
if (P == 0) return NewBB;
DominatorTree *DT = P->getAnalysisIfAvailable<DominatorTree>();
DominanceFrontier *DF = P->getAnalysisIfAvailable<DominanceFrontier>();
LoopInfo *LI = P->getAnalysisIfAvailable<LoopInfo>();
ProfileInfo *PI = P->getAnalysisIfAvailable<ProfileInfo>();
// If we have nothing to update, just return.
if (DT == 0 && DF == 0 && LI == 0 && PI == 0)
return NewBB;
// Now update analysis information. Since the only predecessor of NewBB is
// the TIBB, TIBB clearly dominates NewBB. TIBB usually doesn't dominate
// anything, as there are other successors of DestBB. However, if all other
// predecessors of DestBB are already dominated by DestBB (e.g. DestBB is a
// loop header) then NewBB dominates DestBB.
SmallVector<BasicBlock*, 8> OtherPreds;
// If there is a PHI in the block, loop over predecessors with it, which is
// faster than iterating pred_begin/end.
if (PHINode *PN = dyn_cast<PHINode>(DestBB->begin())) {
for (unsigned i = 0, e = PN->getNumIncomingValues(); i != e; ++i)
if (PN->getIncomingBlock(i) != NewBB)
OtherPreds.push_back(PN->getIncomingBlock(i));
} else {
for (pred_iterator I = pred_begin(DestBB), E = pred_end(DestBB);
I != E; ++I)
if (*I != NewBB)
OtherPreds.push_back(*I);
}
bool NewBBDominatesDestBB = true;
// Should we update DominatorTree information?
if (DT) {
DomTreeNode *TINode = DT->getNode(TIBB);
// The new block is not the immediate dominator for any other nodes, but
// TINode is the immediate dominator for the new node.
//
if (TINode) { // Don't break unreachable code!
DomTreeNode *NewBBNode = DT->addNewBlock(NewBB, TIBB);
DomTreeNode *DestBBNode = 0;
// If NewBBDominatesDestBB hasn't been computed yet, do so with DT.
if (!OtherPreds.empty()) {
DestBBNode = DT->getNode(DestBB);
while (!OtherPreds.empty() && NewBBDominatesDestBB) {
if (DomTreeNode *OPNode = DT->getNode(OtherPreds.back()))
NewBBDominatesDestBB = DT->dominates(DestBBNode, OPNode);
OtherPreds.pop_back();
}
OtherPreds.clear();
}
// If NewBBDominatesDestBB, then NewBB dominates DestBB, otherwise it
// doesn't dominate anything.
if (NewBBDominatesDestBB) {
if (!DestBBNode) DestBBNode = DT->getNode(DestBB);
DT->changeImmediateDominator(DestBBNode, NewBBNode);
}
}
}
// Should we update DominanceFrontier information?
if (DF) {
// If NewBBDominatesDestBB hasn't been computed yet, do so with DF.
if (!OtherPreds.empty()) {
// FIXME: IMPLEMENT THIS!
llvm_unreachable("Requiring domfrontiers but not idom/domtree/domset."
" not implemented yet!");
}
// Since the new block is dominated by its only predecessor TIBB,
// it cannot be in any block's dominance frontier. If NewBB dominates
// DestBB, its dominance frontier is the same as DestBB's, otherwise it is
// just {DestBB}.
DominanceFrontier::DomSetType NewDFSet;
if (NewBBDominatesDestBB) {
DominanceFrontier::iterator I = DF->find(DestBB);
if (I != DF->end()) {
DF->addBasicBlock(NewBB, I->second);
if (I->second.count(DestBB)) {
// However NewBB's frontier does not include DestBB.
DominanceFrontier::iterator NF = DF->find(NewBB);
DF->removeFromFrontier(NF, DestBB);
}
}
else
DF->addBasicBlock(NewBB, DominanceFrontier::DomSetType());
} else {
DominanceFrontier::DomSetType NewDFSet;
NewDFSet.insert(DestBB);
DF->addBasicBlock(NewBB, NewDFSet);
}
}
// Update LoopInfo if it is around.
if (LI) {
if (Loop *TIL = LI->getLoopFor(TIBB)) {
// If one or the other blocks were not in a loop, the new block is not
// either, and thus LI doesn't need to be updated.
if (Loop *DestLoop = LI->getLoopFor(DestBB)) {
if (TIL == DestLoop) {
// Both in the same loop, the NewBB joins loop.
DestLoop->addBasicBlockToLoop(NewBB, LI->getBase());
} else if (TIL->contains(DestLoop)) {
// Edge from an outer loop to an inner loop. Add to the outer loop.
TIL->addBasicBlockToLoop(NewBB, LI->getBase());
} else if (DestLoop->contains(TIL)) {
// Edge from an inner loop to an outer loop. Add to the outer loop.
DestLoop->addBasicBlockToLoop(NewBB, LI->getBase());
} else {
// Edge from two loops with no containment relation. Because these
// are natural loops, we know that the destination block must be the
// header of its loop (adding a branch into a loop elsewhere would
// create an irreducible loop).
assert(DestLoop->getHeader() == DestBB &&
"Should not create irreducible loops!");
if (Loop *P = DestLoop->getParentLoop())
P->addBasicBlockToLoop(NewBB, LI->getBase());
}
}
// If TIBB is in a loop and DestBB is outside of that loop, split the
// other exit blocks of the loop that also have predecessors outside
// the loop, to maintain a LoopSimplify guarantee.
if (!TIL->contains(DestBB) &&
P->mustPreserveAnalysisID(LoopSimplifyID)) {
assert(!TIL->contains(NewBB) &&
"Split point for loop exit is contained in loop!");
// Update LCSSA form in the newly created exit block.
if (P->mustPreserveAnalysisID(LCSSAID)) {
SmallVector<BasicBlock *, 1> OrigPred;
OrigPred.push_back(TIBB);
CreatePHIsForSplitLoopExit(OrigPred, NewBB, DestBB);
}
// For each unique exit block...
SmallVector<BasicBlock *, 4> ExitBlocks;
TIL->getExitBlocks(ExitBlocks);
for (unsigned i = 0, e = ExitBlocks.size(); i != e; ++i) {
// Collect all the preds that are inside the loop, and note
// whether there are any preds outside the loop.
SmallVector<BasicBlock *, 4> Preds;
bool HasPredOutsideOfLoop = false;
BasicBlock *Exit = ExitBlocks[i];
for (pred_iterator I = pred_begin(Exit), E = pred_end(Exit);
I != E; ++I)
if (TIL->contains(*I))
Preds.push_back(*I);
else
HasPredOutsideOfLoop = true;
// If there are any preds not in the loop, we'll need to split
// the edges. The Preds.empty() check is needed because a block
// may appear multiple times in the list. We can't use
// getUniqueExitBlocks above because that depends on LoopSimplify
// form, which we're in the process of restoring!
if (!Preds.empty() && HasPredOutsideOfLoop) {
BasicBlock *NewExitBB =
SplitBlockPredecessors(Exit, Preds.data(), Preds.size(),
"split", P);
if (P->mustPreserveAnalysisID(LCSSAID))
CreatePHIsForSplitLoopExit(Preds, NewExitBB, Exit);
}
}
}
// LCSSA form was updated above for the case where LoopSimplify is
// available, which means that all predecessors of loop exit blocks
// are within the loop. Without LoopSimplify form, it would be
// necessary to insert a new phi.
assert((!P->mustPreserveAnalysisID(LCSSAID) ||
P->mustPreserveAnalysisID(LoopSimplifyID)) &&
"SplitCriticalEdge doesn't know how to update LCCSA form "
"without LoopSimplify!");
}
}
// Update ProfileInfo if it is around.
if (PI)
PI->splitEdge(TIBB, DestBB, NewBB, MergeIdenticalEdges);
return NewBB;
}
/// OptimizeMemoryInst - Load and Store Instructions often have
/// addressing modes that can do significant amounts of computation. As such,
/// instruction selection will try to get the load or store to do as much
/// computation as possible for the program. The problem is that isel can only
/// see within a single block. As such, we sink as much legal addressing mode
/// stuff into the block as possible.
///
/// This method is used to optimize both load/store and inline asms with memory
/// operands.
bool CodeGenPrepare::OptimizeMemoryInst(Instruction *MemoryInst, Value *Addr,
Type *AccessTy) {
Value *Repl = Addr;
// Try to collapse single-value PHI nodes. This is necessary to undo
// unprofitable PRE transformations.
SmallVector<Value*, 8> worklist;
SmallPtrSet<Value*, 16> Visited;
worklist.push_back(Addr);
// Use a worklist to iteratively look through PHI nodes, and ensure that
// the addressing mode obtained from the non-PHI roots of the graph
// are equivalent.
Value *Consensus = 0;
unsigned NumUsesConsensus = 0;
bool IsNumUsesConsensusValid = false;
SmallVector<Instruction*, 16> AddrModeInsts;
ExtAddrMode AddrMode;
while (!worklist.empty()) {
Value *V = worklist.back();
worklist.pop_back();
// Break use-def graph loops.
if (!Visited.insert(V)) {
Consensus = 0;
break;
}
// For a PHI node, push all of its incoming values.
if (PHINode *P = dyn_cast<PHINode>(V)) {
for (unsigned i = 0, e = P->getNumIncomingValues(); i != e; ++i)
worklist.push_back(P->getIncomingValue(i));
continue;
}
// For non-PHIs, determine the addressing mode being computed.
SmallVector<Instruction*, 16> NewAddrModeInsts;
ExtAddrMode NewAddrMode =
AddressingModeMatcher::Match(V, AccessTy, MemoryInst,
NewAddrModeInsts, *TLI);
// This check is broken into two cases with very similar code to avoid using
// getNumUses() as much as possible. Some values have a lot of uses, so
// calling getNumUses() unconditionally caused a significant compile-time
// regression.
if (!Consensus) {
Consensus = V;
AddrMode = NewAddrMode;
AddrModeInsts = NewAddrModeInsts;
continue;
} else if (NewAddrMode == AddrMode) {
if (!IsNumUsesConsensusValid) {
NumUsesConsensus = Consensus->getNumUses();
IsNumUsesConsensusValid = true;
}
// Ensure that the obtained addressing mode is equivalent to that obtained
// for all other roots of the PHI traversal. Also, when choosing one
// such root as representative, select the one with the most uses in order
// to keep the cost modeling heuristics in AddressingModeMatcher
// applicable.
unsigned NumUses = V->getNumUses();
if (NumUses > NumUsesConsensus) {
Consensus = V;
NumUsesConsensus = NumUses;
AddrModeInsts = NewAddrModeInsts;
}
continue;
}
Consensus = 0;
break;
}
// If the addressing mode couldn't be determined, or if multiple different
// ones were determined, bail out now.
if (!Consensus) return false;
// Check to see if any of the instructions supersumed by this addr mode are
// non-local to I's BB.
bool AnyNonLocal = false;
for (unsigned i = 0, e = AddrModeInsts.size(); i != e; ++i) {
if (IsNonLocalValue(AddrModeInsts[i], MemoryInst->getParent())) {
AnyNonLocal = true;
break;
}
}
// If all the instructions matched are already in this BB, don't do anything.
if (!AnyNonLocal) {
DEBUG(dbgs() << "CGP: Found local addrmode: " << AddrMode << "\n");
return false;
}
// Insert this computation right after this user. Since our caller is
// scanning from the top of the BB to the bottom, reuse of the expr are
// guaranteed to happen later.
IRBuilder<> Builder(MemoryInst);
// Now that we determined the addressing expression we want to use and know
// that we have to sink it into this block. Check to see if we have already
// done this for some other load/store instr in this block. If so, reuse the
// computation.
Value *&SunkAddr = SunkAddrs[Addr];
if (SunkAddr) {
DEBUG(dbgs() << "CGP: Reusing nonlocal addrmode: " << AddrMode << " for "
<< *MemoryInst);
if (SunkAddr->getType() != Addr->getType())
SunkAddr = Builder.CreateBitCast(SunkAddr, Addr->getType());
} else {
DEBUG(dbgs() << "CGP: SINKING nonlocal addrmode: " << AddrMode << " for "
<< *MemoryInst);
Type *IntPtrTy =
TLI->getTargetData()->getIntPtrType(AccessTy->getContext());
Value *Result = 0;
// Start with the base register. Do this first so that subsequent address
// matching finds it last, which will prevent it from trying to match it
// as the scaled value in case it happens to be a mul. That would be
// problematic if we've sunk a different mul for the scale, because then
// we'd end up sinking both muls.
if (AddrMode.BaseReg) {
Value *V = AddrMode.BaseReg;
if (V->getType()->isPointerTy())
V = Builder.CreatePtrToInt(V, IntPtrTy, "sunkaddr");
if (V->getType() != IntPtrTy)
V = Builder.CreateIntCast(V, IntPtrTy, /*isSigned=*/true, "sunkaddr");
Result = V;
}
// Add the scale value.
if (AddrMode.Scale) {
Value *V = AddrMode.ScaledReg;
if (V->getType() == IntPtrTy) {
// done.
} else if (V->getType()->isPointerTy()) {
V = Builder.CreatePtrToInt(V, IntPtrTy, "sunkaddr");
} else if (cast<IntegerType>(IntPtrTy)->getBitWidth() <
cast<IntegerType>(V->getType())->getBitWidth()) {
V = Builder.CreateTrunc(V, IntPtrTy, "sunkaddr");
} else {
V = Builder.CreateSExt(V, IntPtrTy, "sunkaddr");
}
if (AddrMode.Scale != 1)
V = Builder.CreateMul(V, ConstantInt::get(IntPtrTy, AddrMode.Scale),
"sunkaddr");
if (Result)
Result = Builder.CreateAdd(Result, V, "sunkaddr");
else
Result = V;
}
// Add in the BaseGV if present.
if (AddrMode.BaseGV) {
Value *V = Builder.CreatePtrToInt(AddrMode.BaseGV, IntPtrTy, "sunkaddr");
if (Result)
Result = Builder.CreateAdd(Result, V, "sunkaddr");
else
Result = V;
}
// Add in the Base Offset if present.
if (AddrMode.BaseOffs) {
Value *V = ConstantInt::get(IntPtrTy, AddrMode.BaseOffs);
if (Result)
Result = Builder.CreateAdd(Result, V, "sunkaddr");
else
Result = V;
}
if (Result == 0)
SunkAddr = Constant::getNullValue(Addr->getType());
else
SunkAddr = Builder.CreateIntToPtr(Result, Addr->getType(), "sunkaddr");
}
MemoryInst->replaceUsesOfWith(Repl, SunkAddr);
// If we have no uses, recursively delete the value and all dead instructions
// using it.
if (Repl->use_empty()) {
// This can cause recursive deletion, which can invalidate our iterator.
// Use a WeakVH to hold onto it in case this happens.
WeakVH IterHandle(CurInstIterator);
BasicBlock *BB = CurInstIterator->getParent();
RecursivelyDeleteTriviallyDeadInstructions(Repl);
if (IterHandle != CurInstIterator) {
// If the iterator instruction was recursively deleted, start over at the
// start of the block.
CurInstIterator = BB->begin();
SunkAddrs.clear();
} else {
// This address is now available for reassignment, so erase the table
// entry; we don't want to match some completely different instruction.
SunkAddrs[Addr] = 0;
}
}
++NumMemoryInsts;
return true;
}
bool AArch64RedundantCopyElimination::optimizeBlock(MachineBasicBlock *MBB) {
// Check if the current basic block has a single predecessor.
if (MBB->pred_size() != 1)
return false;
// Check if the predecessor has two successors, implying the block ends in a
// conditional branch.
MachineBasicBlock *PredMBB = *MBB->pred_begin();
if (PredMBB->succ_size() != 2)
return false;
MachineBasicBlock::iterator CondBr = PredMBB->getLastNonDebugInstr();
if (CondBr == PredMBB->end())
return false;
// Keep track of the earliest point in the PredMBB block where kill markers
// need to be removed if a COPY is removed.
MachineBasicBlock::iterator FirstUse;
// After calling knownRegValInBlock, FirstUse will either point to a CBZ/CBNZ
// or a compare (i.e., SUBS). In the latter case, we must take care when
// updating FirstUse when scanning for COPY instructions. In particular, if
// there's a COPY in between the compare and branch the COPY should not
// update FirstUse.
bool SeenFirstUse = false;
// Registers that contain a known value at the start of MBB.
SmallVector<RegImm, 4> KnownRegs;
MachineBasicBlock::iterator Itr = std::next(CondBr);
do {
--Itr;
if (!knownRegValInBlock(*Itr, MBB, KnownRegs, FirstUse))
continue;
// Reset the clobber list.
OptBBClobberedRegs.reset();
// Look backward in PredMBB for COPYs from the known reg to find other
// registers that are known to be a constant value.
for (auto PredI = Itr;; --PredI) {
if (FirstUse == PredI)
SeenFirstUse = true;
if (PredI->isCopy()) {
MCPhysReg CopyDstReg = PredI->getOperand(0).getReg();
MCPhysReg CopySrcReg = PredI->getOperand(1).getReg();
for (auto &KnownReg : KnownRegs) {
if (OptBBClobberedRegs[KnownReg.Reg])
continue;
// If we have X = COPY Y, and Y is known to be zero, then now X is
// known to be zero.
if (CopySrcReg == KnownReg.Reg && !OptBBClobberedRegs[CopyDstReg]) {
KnownRegs.push_back(RegImm(CopyDstReg, KnownReg.Imm));
if (SeenFirstUse)
FirstUse = PredI;
break;
}
// If we have X = COPY Y, and X is known to be zero, then now Y is
// known to be zero.
if (CopyDstReg == KnownReg.Reg && !OptBBClobberedRegs[CopySrcReg]) {
KnownRegs.push_back(RegImm(CopySrcReg, KnownReg.Imm));
if (SeenFirstUse)
FirstUse = PredI;
break;
}
}
}
// Stop if we get to the beginning of PredMBB.
if (PredI == PredMBB->begin())
break;
trackRegDefs(*PredI, OptBBClobberedRegs, TRI);
// Stop if all of the known-zero regs have been clobbered.
if (all_of(KnownRegs, [&](RegImm KnownReg) {
return OptBBClobberedRegs[KnownReg.Reg];
}))
break;
}
break;
} while (Itr != PredMBB->begin() && Itr->isTerminator());
// We've not found a registers with a known value, time to bail out.
if (KnownRegs.empty())
return false;
bool Changed = false;
// UsedKnownRegs is the set of KnownRegs that have had uses added to MBB.
SmallSetVector<unsigned, 4> UsedKnownRegs;
MachineBasicBlock::iterator LastChange = MBB->begin();
// Remove redundant copy/move instructions unless KnownReg is modified.
for (MachineBasicBlock::iterator I = MBB->begin(), E = MBB->end(); I != E;) {
MachineInstr *MI = &*I;
++I;
bool RemovedMI = false;
bool IsCopy = MI->isCopy();
bool IsMoveImm = MI->isMoveImmediate();
if (IsCopy || IsMoveImm) {
MCPhysReg DefReg = MI->getOperand(0).getReg();
MCPhysReg SrcReg = IsCopy ? MI->getOperand(1).getReg() : 0;
int64_t SrcImm = IsMoveImm ? MI->getOperand(1).getImm() : 0;
if (!MRI->isReserved(DefReg) &&
((IsCopy && (SrcReg == AArch64::XZR || SrcReg == AArch64::WZR)) ||
IsMoveImm)) {
for (RegImm &KnownReg : KnownRegs) {
if (KnownReg.Reg != DefReg &&
!TRI->isSuperRegister(DefReg, KnownReg.Reg))
continue;
// For a copy, the known value must be a zero.
if (IsCopy && KnownReg.Imm != 0)
continue;
if (IsMoveImm) {
// For a move immediate, the known immediate must match the source
// immediate.
if (KnownReg.Imm != SrcImm)
continue;
// Don't remove a move immediate that implicitly defines the upper
// bits when only the lower 32 bits are known.
MCPhysReg CmpReg = KnownReg.Reg;
if (any_of(MI->implicit_operands(), [CmpReg](MachineOperand &O) {
return !O.isDead() && O.isReg() && O.isDef() &&
O.getReg() != CmpReg;
}))
continue;
}
if (IsCopy)
DEBUG(dbgs() << "Remove redundant Copy : " << *MI);
else
DEBUG(dbgs() << "Remove redundant Move : " << *MI);
MI->eraseFromParent();
Changed = true;
LastChange = I;
NumCopiesRemoved++;
UsedKnownRegs.insert(KnownReg.Reg);
RemovedMI = true;
break;
}
}
}
// Skip to the next instruction if we removed the COPY/MovImm.
if (RemovedMI)
continue;
// Remove any regs the MI clobbers from the KnownConstRegs set.
for (unsigned RI = 0; RI < KnownRegs.size();)
if (MI->modifiesRegister(KnownRegs[RI].Reg, TRI)) {
std::swap(KnownRegs[RI], KnownRegs[KnownRegs.size() - 1]);
KnownRegs.pop_back();
// Don't increment RI since we need to now check the swapped-in
// KnownRegs[RI].
} else {
++RI;
}
// Continue until the KnownRegs set is empty.
if (KnownRegs.empty())
break;
}
if (!Changed)
return false;
// Add newly used regs to the block's live-in list if they aren't there
// already.
for (MCPhysReg KnownReg : UsedKnownRegs)
if (!MBB->isLiveIn(KnownReg))
MBB->addLiveIn(KnownReg);
// Clear kills in the range where changes were made. This is conservative,
// but should be okay since kill markers are being phased out.
DEBUG(dbgs() << "Clearing kill flags.\n\tFirstUse: " << *FirstUse
<< "\tLastChange: " << *LastChange);
for (MachineInstr &MMI : make_range(FirstUse, PredMBB->end()))
MMI.clearKillInfo();
for (MachineInstr &MMI : make_range(MBB->begin(), LastChange))
MMI.clearKillInfo();
return true;
}