1 //===-- FunctionLoweringInfo.cpp ------------------------------------------===//
3 // The LLVM Compiler Infrastructure
5 // This file is distributed under the University of Illinois Open Source
6 // License. See LICENSE.TXT for details.
8 //===----------------------------------------------------------------------===//
10 // This implements routines for translating functions from LLVM IR into
13 //===----------------------------------------------------------------------===//
15 #include "llvm/CodeGen/FunctionLoweringInfo.h"
16 #include "llvm/ADT/PostOrderIterator.h"
17 #include "llvm/CodeGen/Analysis.h"
18 #include "llvm/CodeGen/MachineFrameInfo.h"
19 #include "llvm/CodeGen/MachineFunction.h"
20 #include "llvm/CodeGen/MachineInstrBuilder.h"
21 #include "llvm/CodeGen/MachineModuleInfo.h"
22 #include "llvm/CodeGen/MachineRegisterInfo.h"
23 #include "llvm/CodeGen/WinEHFuncInfo.h"
24 #include "llvm/IR/DataLayout.h"
25 #include "llvm/IR/DebugInfo.h"
26 #include "llvm/IR/DerivedTypes.h"
27 #include "llvm/IR/Function.h"
28 #include "llvm/IR/Instructions.h"
29 #include "llvm/IR/IntrinsicInst.h"
30 #include "llvm/IR/LLVMContext.h"
31 #include "llvm/IR/Module.h"
32 #include "llvm/Support/Debug.h"
33 #include "llvm/Support/ErrorHandling.h"
34 #include "llvm/Support/MathExtras.h"
35 #include "llvm/Support/raw_ostream.h"
36 #include "llvm/Target/TargetFrameLowering.h"
37 #include "llvm/Target/TargetInstrInfo.h"
38 #include "llvm/Target/TargetLowering.h"
39 #include "llvm/Target/TargetOptions.h"
40 #include "llvm/Target/TargetRegisterInfo.h"
41 #include "llvm/Target/TargetSubtargetInfo.h"
45 #define DEBUG_TYPE "function-lowering-info"
47 /// isUsedOutsideOfDefiningBlock - Return true if this instruction is used by
48 /// PHI nodes or outside of the basic block that defines it, or used by a
49 /// switch or atomic instruction, which may expand to multiple basic blocks.
50 static bool isUsedOutsideOfDefiningBlock(const Instruction *I) {
51 if (I->use_empty()) return false;
52 if (isa<PHINode>(I)) return true;
53 const BasicBlock *BB = I->getParent();
54 for (const User *U : I->users())
55 if (cast<Instruction>(U)->getParent() != BB || isa<PHINode>(U))
61 static ISD::NodeType getPreferredExtendForValue(const Value *V) {
62 // For the users of the source value being used for compare instruction, if
63 // the number of signed predicate is greater than unsigned predicate, we
64 // prefer to use SIGN_EXTEND.
66 // With this optimization, we would be able to reduce some redundant sign or
67 // zero extension instruction, and eventually more machine CSE opportunities
69 ISD::NodeType ExtendKind = ISD::ANY_EXTEND;
70 unsigned NumOfSigned = 0, NumOfUnsigned = 0;
71 for (const User *U : V->users()) {
72 if (const auto *CI = dyn_cast<CmpInst>(U)) {
73 NumOfSigned += CI->isSigned();
74 NumOfUnsigned += CI->isUnsigned();
77 if (NumOfSigned > NumOfUnsigned)
78 ExtendKind = ISD::SIGN_EXTEND;
84 struct WinEHNumbering {
85 WinEHNumbering(WinEHFuncInfo &FuncInfo) : FuncInfo(FuncInfo), NextState(0) {}
87 WinEHFuncInfo &FuncInfo;
90 SmallVector<ActionHandler *, 4> HandlerStack;
92 int currentEHNumber() const {
93 return HandlerStack.empty() ? -1 : HandlerStack.back()->getEHState();
96 void parseEHActions(const IntrinsicInst *II,
97 SmallVectorImpl<ActionHandler *> &Actions);
98 void createUnwindMapEntry(int ToState, ActionHandler *AH);
99 void proccessCallSite(ArrayRef<ActionHandler *> Actions, ImmutableCallSite CS);
100 void calculateStateNumbers(const Function &F);
104 void FunctionLoweringInfo::set(const Function &fn, MachineFunction &mf,
108 TLI = MF->getSubtarget().getTargetLowering();
109 RegInfo = &MF->getRegInfo();
110 MachineModuleInfo &MMI = MF->getMMI();
112 // Check whether the function can return without sret-demotion.
113 SmallVector<ISD::OutputArg, 4> Outs;
114 GetReturnInfo(Fn->getReturnType(), Fn->getAttributes(), Outs, *TLI);
115 CanLowerReturn = TLI->CanLowerReturn(Fn->getCallingConv(), *MF,
116 Fn->isVarArg(), Outs, Fn->getContext());
118 // Initialize the mapping of values to registers. This is only set up for
119 // instruction values that are used outside of the block that defines
121 Function::const_iterator BB = Fn->begin(), EB = Fn->end();
122 for (; BB != EB; ++BB)
123 for (BasicBlock::const_iterator I = BB->begin(), E = BB->end();
125 if (const AllocaInst *AI = dyn_cast<AllocaInst>(I)) {
126 // Static allocas can be folded into the initial stack frame adjustment.
127 if (AI->isStaticAlloca()) {
128 const ConstantInt *CUI = cast<ConstantInt>(AI->getArraySize());
129 Type *Ty = AI->getAllocatedType();
130 uint64_t TySize = TLI->getDataLayout()->getTypeAllocSize(Ty);
132 std::max((unsigned)TLI->getDataLayout()->getPrefTypeAlignment(Ty),
135 TySize *= CUI->getZExtValue(); // Get total allocated size.
136 if (TySize == 0) TySize = 1; // Don't create zero-sized stack objects.
138 StaticAllocaMap[AI] =
139 MF->getFrameInfo()->CreateStackObject(TySize, Align, false, AI);
142 unsigned Align = std::max(
143 (unsigned)TLI->getDataLayout()->getPrefTypeAlignment(
144 AI->getAllocatedType()),
146 unsigned StackAlign =
147 MF->getSubtarget().getFrameLowering()->getStackAlignment();
148 if (Align <= StackAlign)
150 // Inform the Frame Information that we have variable-sized objects.
151 MF->getFrameInfo()->CreateVariableSizedObject(Align ? Align : 1, AI);
155 // Look for inline asm that clobbers the SP register.
156 if (isa<CallInst>(I) || isa<InvokeInst>(I)) {
157 ImmutableCallSite CS(I);
158 if (isa<InlineAsm>(CS.getCalledValue())) {
159 unsigned SP = TLI->getStackPointerRegisterToSaveRestore();
160 const TargetRegisterInfo *TRI = MF->getSubtarget().getRegisterInfo();
161 std::vector<TargetLowering::AsmOperandInfo> Ops =
162 TLI->ParseConstraints(TRI, CS);
163 for (size_t I = 0, E = Ops.size(); I != E; ++I) {
164 TargetLowering::AsmOperandInfo &Op = Ops[I];
165 if (Op.Type == InlineAsm::isClobber) {
166 // Clobbers don't have SDValue operands, hence SDValue().
167 TLI->ComputeConstraintToUse(Op, SDValue(), DAG);
168 std::pair<unsigned, const TargetRegisterClass *> PhysReg =
169 TLI->getRegForInlineAsmConstraint(TRI, Op.ConstraintCode,
171 if (PhysReg.first == SP)
172 MF->getFrameInfo()->setHasInlineAsmWithSPAdjust(true);
178 // Look for calls to the @llvm.va_start intrinsic. We can omit some
179 // prologue boilerplate for variadic functions that don't examine their
181 if (const auto *II = dyn_cast<IntrinsicInst>(I)) {
182 if (II->getIntrinsicID() == Intrinsic::vastart)
183 MF->getFrameInfo()->setHasVAStart(true);
186 // If we have a musttail call in a variadic funciton, we need to ensure we
187 // forward implicit register parameters.
188 if (const auto *CI = dyn_cast<CallInst>(I)) {
189 if (CI->isMustTailCall() && Fn->isVarArg())
190 MF->getFrameInfo()->setHasMustTailInVarArgFunc(true);
193 // Mark values used outside their block as exported, by allocating
194 // a virtual register for them.
195 if (isUsedOutsideOfDefiningBlock(I))
196 if (!isa<AllocaInst>(I) ||
197 !StaticAllocaMap.count(cast<AllocaInst>(I)))
198 InitializeRegForValue(I);
200 // Collect llvm.dbg.declare information. This is done now instead of
201 // during the initial isel pass through the IR so that it is done
202 // in a predictable order.
203 if (const DbgDeclareInst *DI = dyn_cast<DbgDeclareInst>(I)) {
204 DIVariable DIVar(DI->getVariable());
205 assert((!DIVar || DIVar.isVariable()) &&
206 "Variable in DbgDeclareInst should be either null or a DIVariable.");
207 if (MMI.hasDebugInfo() && DIVar && DI->getDebugLoc()) {
208 // Don't handle byval struct arguments or VLAs, for example.
209 // Non-byval arguments are handled here (they refer to the stack
210 // temporary alloca at this point).
211 const Value *Address = DI->getAddress();
213 if (const BitCastInst *BCI = dyn_cast<BitCastInst>(Address))
214 Address = BCI->getOperand(0);
215 if (const AllocaInst *AI = dyn_cast<AllocaInst>(Address)) {
216 DenseMap<const AllocaInst *, int>::iterator SI =
217 StaticAllocaMap.find(AI);
218 if (SI != StaticAllocaMap.end()) { // Check for VLAs.
220 MMI.setVariableDbgInfo(DI->getVariable(), DI->getExpression(),
221 FI, DI->getDebugLoc());
228 // Decide the preferred extend type for a value.
229 PreferredExtendType[I] = getPreferredExtendForValue(I);
232 // Create an initial MachineBasicBlock for each LLVM BasicBlock in F. This
233 // also creates the initial PHI MachineInstrs, though none of the input
234 // operands are populated.
235 for (BB = Fn->begin(); BB != EB; ++BB) {
236 MachineBasicBlock *MBB = mf.CreateMachineBasicBlock(BB);
240 // Transfer the address-taken flag. This is necessary because there could
241 // be multiple MachineBasicBlocks corresponding to one BasicBlock, and only
242 // the first one should be marked.
243 if (BB->hasAddressTaken())
244 MBB->setHasAddressTaken();
246 // Create Machine PHI nodes for LLVM PHI nodes, lowering them as
248 for (BasicBlock::const_iterator I = BB->begin();
249 const PHINode *PN = dyn_cast<PHINode>(I); ++I) {
250 if (PN->use_empty()) continue;
253 if (PN->getType()->isEmptyTy())
256 DebugLoc DL = PN->getDebugLoc();
257 unsigned PHIReg = ValueMap[PN];
258 assert(PHIReg && "PHI node does not have an assigned virtual register!");
260 SmallVector<EVT, 4> ValueVTs;
261 ComputeValueVTs(*TLI, PN->getType(), ValueVTs);
262 for (unsigned vti = 0, vte = ValueVTs.size(); vti != vte; ++vti) {
263 EVT VT = ValueVTs[vti];
264 unsigned NumRegisters = TLI->getNumRegisters(Fn->getContext(), VT);
265 const TargetInstrInfo *TII = MF->getSubtarget().getInstrInfo();
266 for (unsigned i = 0; i != NumRegisters; ++i)
267 BuildMI(MBB, DL, TII->get(TargetOpcode::PHI), PHIReg + i);
268 PHIReg += NumRegisters;
273 // Mark landing pad blocks.
274 for (BB = Fn->begin(); BB != EB; ++BB)
275 if (const auto *Invoke = dyn_cast<InvokeInst>(BB->getTerminator()))
276 MBBMap[Invoke->getSuccessor(1)]->setIsLandingPad();
278 // Calculate EH numbers for WinEH.
279 if (fn.getFnAttribute("wineh-parent").getValueAsString() == fn.getName())
280 WinEHNumbering(MMI.getWinEHFuncInfo(&fn)).calculateStateNumbers(fn);
283 void WinEHNumbering::parseEHActions(const IntrinsicInst *II,
284 SmallVectorImpl<ActionHandler *> &Actions) {
285 for (unsigned I = 0, E = II->getNumArgOperands(); I != E;) {
286 uint64_t ActionKind =
287 cast<ConstantInt>(II->getArgOperand(I))->getZExtValue();
288 if (ActionKind == /*catch=*/1) {
289 auto *Selector = cast<Constant>(II->getArgOperand(I + 1));
290 Value *CatchObject = II->getArgOperand(I + 2);
291 Constant *Handler = cast<Constant>(II->getArgOperand(I + 3));
293 auto *CH = new CatchHandler(/*BB=*/nullptr, Selector, /*NextBB=*/nullptr);
294 CH->setExceptionVar(CatchObject);
295 CH->setHandlerBlockOrFunc(Handler);
296 Actions.push_back(CH);
298 assert(ActionKind == 0 && "expected a cleanup or a catch action!");
299 Constant *Handler = cast<Constant>(II->getArgOperand(I + 1));
301 auto *CH = new CleanupHandler(/*BB=*/nullptr);
302 CH->setHandlerBlockOrFunc(Handler);
303 Actions.push_back(CH);
306 std::reverse(Actions.begin(), Actions.end());
309 void WinEHNumbering::createUnwindMapEntry(int ToState, ActionHandler *AH) {
310 WinEHUnwindMapEntry UME;
311 UME.ToState = ToState;
312 if (auto *CH = dyn_cast<CleanupHandler>(AH))
313 UME.Cleanup = cast<Function>(CH->getHandlerBlockOrFunc());
315 UME.Cleanup = nullptr;
316 FuncInfo.UnwindMap.push_back(UME);
319 static void print_name(const Value *V) {
322 DEBUG(dbgs() << "null");
326 if (const auto *F = dyn_cast<Function>(V))
327 DEBUG(dbgs() << F->getName());
333 void WinEHNumbering::proccessCallSite(ArrayRef<ActionHandler *> Actions,
334 ImmutableCallSite CS) {
336 // float, double, int
337 int FirstMismatch = 0;
338 for (int E = std::min(HandlerStack.size(), Actions.size()); FirstMismatch < E;
340 if (HandlerStack[FirstMismatch]->getHandlerBlockOrFunc() !=
341 Actions[FirstMismatch]->getHandlerBlockOrFunc())
343 delete Actions[FirstMismatch];
346 // Don't recurse while we are looping over the handler stack. Instead, defer
347 // the numbering of the catch handlers until we are done popping.
348 SmallVector<const Function *, 4> UnnumberedHandlers;
349 for (int I = HandlerStack.size() - 1; I >= FirstMismatch; --I) {
350 if (auto *CH = dyn_cast<CatchHandler>(HandlerStack.back()))
351 if (const auto *F = dyn_cast<Function>(CH->getHandlerBlockOrFunc()))
352 UnnumberedHandlers.push_back(F);
353 // Pop the handlers off of the stack.
354 delete HandlerStack.back();
355 HandlerStack.pop_back();
358 for (const Function *F : UnnumberedHandlers)
359 calculateStateNumbers(*F);
361 for (size_t I = FirstMismatch; I != Actions.size(); ++I) {
362 createUnwindMapEntry(currentEHNumber(), Actions[I]);
363 Actions[I]->setEHState(NextState++);
364 DEBUG(dbgs() << "Creating unwind map entry for: (");
365 print_name(Actions[I]->getHandlerBlockOrFunc());
366 DEBUG(dbgs() << ", " << currentEHNumber() << ")\n");
367 HandlerStack.push_back(Actions[I]);
370 DEBUG(dbgs() << "In EHState " << currentEHNumber() << " for CallSite: ");
371 print_name(CS ? CS.getCalledValue() : nullptr);
372 DEBUG(dbgs() << '\n');
375 void WinEHNumbering::calculateStateNumbers(const Function &F) {
376 DEBUG(dbgs() << "Calculating state numbers for: " << F.getName() << '\n');
377 SmallVector<ActionHandler *, 4> ActionList;
378 for (const BasicBlock &BB : F) {
379 for (const Instruction &I : BB) {
380 const auto *CI = dyn_cast<CallInst>(&I);
381 if (!CI || CI->doesNotThrow())
383 proccessCallSite(None, CI);
385 const auto *II = dyn_cast<InvokeInst>(BB.getTerminator());
388 const LandingPadInst *LPI = II->getLandingPadInst();
389 if (auto *ActionsCall = dyn_cast<IntrinsicInst>(LPI->getNextNode())) {
390 assert(ActionsCall->getIntrinsicID() == Intrinsic::eh_actions);
391 parseEHActions(ActionsCall, ActionList);
392 proccessCallSite(ActionList, II);
394 FuncInfo.LandingPadStateMap[LPI] = currentEHNumber();
397 proccessCallSite(None, ImmutableCallSite());
400 /// clear - Clear out all the function-specific state. This returns this
401 /// FunctionLoweringInfo to an empty state, ready to be used for a
402 /// different function.
403 void FunctionLoweringInfo::clear() {
404 assert(CatchInfoFound.size() == CatchInfoLost.size() &&
405 "Not all catch info was assigned to a landing pad!");
409 StaticAllocaMap.clear();
411 CatchInfoLost.clear();
412 CatchInfoFound.clear();
414 LiveOutRegInfo.clear();
416 ArgDbgValues.clear();
417 ByValArgFrameIndexMap.clear();
419 StatepointStackSlots.clear();
420 PreferredExtendType.clear();
423 /// CreateReg - Allocate a single virtual register for the given type.
424 unsigned FunctionLoweringInfo::CreateReg(MVT VT) {
425 return RegInfo->createVirtualRegister(
426 MF->getSubtarget().getTargetLowering()->getRegClassFor(VT));
429 /// CreateRegs - Allocate the appropriate number of virtual registers of
430 /// the correctly promoted or expanded types. Assign these registers
431 /// consecutive vreg numbers and return the first assigned number.
433 /// In the case that the given value has struct or array type, this function
434 /// will assign registers for each member or element.
436 unsigned FunctionLoweringInfo::CreateRegs(Type *Ty) {
437 const TargetLowering *TLI = MF->getSubtarget().getTargetLowering();
439 SmallVector<EVT, 4> ValueVTs;
440 ComputeValueVTs(*TLI, Ty, ValueVTs);
442 unsigned FirstReg = 0;
443 for (unsigned Value = 0, e = ValueVTs.size(); Value != e; ++Value) {
444 EVT ValueVT = ValueVTs[Value];
445 MVT RegisterVT = TLI->getRegisterType(Ty->getContext(), ValueVT);
447 unsigned NumRegs = TLI->getNumRegisters(Ty->getContext(), ValueVT);
448 for (unsigned i = 0; i != NumRegs; ++i) {
449 unsigned R = CreateReg(RegisterVT);
450 if (!FirstReg) FirstReg = R;
456 /// GetLiveOutRegInfo - Gets LiveOutInfo for a register, returning NULL if the
457 /// register is a PHI destination and the PHI's LiveOutInfo is not valid. If
458 /// the register's LiveOutInfo is for a smaller bit width, it is extended to
459 /// the larger bit width by zero extension. The bit width must be no smaller
460 /// than the LiveOutInfo's existing bit width.
461 const FunctionLoweringInfo::LiveOutInfo *
462 FunctionLoweringInfo::GetLiveOutRegInfo(unsigned Reg, unsigned BitWidth) {
463 if (!LiveOutRegInfo.inBounds(Reg))
466 LiveOutInfo *LOI = &LiveOutRegInfo[Reg];
470 if (BitWidth > LOI->KnownZero.getBitWidth()) {
471 LOI->NumSignBits = 1;
472 LOI->KnownZero = LOI->KnownZero.zextOrTrunc(BitWidth);
473 LOI->KnownOne = LOI->KnownOne.zextOrTrunc(BitWidth);
479 /// ComputePHILiveOutRegInfo - Compute LiveOutInfo for a PHI's destination
480 /// register based on the LiveOutInfo of its operands.
481 void FunctionLoweringInfo::ComputePHILiveOutRegInfo(const PHINode *PN) {
482 Type *Ty = PN->getType();
483 if (!Ty->isIntegerTy() || Ty->isVectorTy())
486 SmallVector<EVT, 1> ValueVTs;
487 ComputeValueVTs(*TLI, Ty, ValueVTs);
488 assert(ValueVTs.size() == 1 &&
489 "PHIs with non-vector integer types should have a single VT.");
490 EVT IntVT = ValueVTs[0];
492 if (TLI->getNumRegisters(PN->getContext(), IntVT) != 1)
494 IntVT = TLI->getTypeToTransformTo(PN->getContext(), IntVT);
495 unsigned BitWidth = IntVT.getSizeInBits();
497 unsigned DestReg = ValueMap[PN];
498 if (!TargetRegisterInfo::isVirtualRegister(DestReg))
500 LiveOutRegInfo.grow(DestReg);
501 LiveOutInfo &DestLOI = LiveOutRegInfo[DestReg];
503 Value *V = PN->getIncomingValue(0);
504 if (isa<UndefValue>(V) || isa<ConstantExpr>(V)) {
505 DestLOI.NumSignBits = 1;
506 APInt Zero(BitWidth, 0);
507 DestLOI.KnownZero = Zero;
508 DestLOI.KnownOne = Zero;
512 if (ConstantInt *CI = dyn_cast<ConstantInt>(V)) {
513 APInt Val = CI->getValue().zextOrTrunc(BitWidth);
514 DestLOI.NumSignBits = Val.getNumSignBits();
515 DestLOI.KnownZero = ~Val;
516 DestLOI.KnownOne = Val;
518 assert(ValueMap.count(V) && "V should have been placed in ValueMap when its"
519 "CopyToReg node was created.");
520 unsigned SrcReg = ValueMap[V];
521 if (!TargetRegisterInfo::isVirtualRegister(SrcReg)) {
522 DestLOI.IsValid = false;
525 const LiveOutInfo *SrcLOI = GetLiveOutRegInfo(SrcReg, BitWidth);
527 DestLOI.IsValid = false;
533 assert(DestLOI.KnownZero.getBitWidth() == BitWidth &&
534 DestLOI.KnownOne.getBitWidth() == BitWidth &&
535 "Masks should have the same bit width as the type.");
537 for (unsigned i = 1, e = PN->getNumIncomingValues(); i != e; ++i) {
538 Value *V = PN->getIncomingValue(i);
539 if (isa<UndefValue>(V) || isa<ConstantExpr>(V)) {
540 DestLOI.NumSignBits = 1;
541 APInt Zero(BitWidth, 0);
542 DestLOI.KnownZero = Zero;
543 DestLOI.KnownOne = Zero;
547 if (ConstantInt *CI = dyn_cast<ConstantInt>(V)) {
548 APInt Val = CI->getValue().zextOrTrunc(BitWidth);
549 DestLOI.NumSignBits = std::min(DestLOI.NumSignBits, Val.getNumSignBits());
550 DestLOI.KnownZero &= ~Val;
551 DestLOI.KnownOne &= Val;
555 assert(ValueMap.count(V) && "V should have been placed in ValueMap when "
556 "its CopyToReg node was created.");
557 unsigned SrcReg = ValueMap[V];
558 if (!TargetRegisterInfo::isVirtualRegister(SrcReg)) {
559 DestLOI.IsValid = false;
562 const LiveOutInfo *SrcLOI = GetLiveOutRegInfo(SrcReg, BitWidth);
564 DestLOI.IsValid = false;
567 DestLOI.NumSignBits = std::min(DestLOI.NumSignBits, SrcLOI->NumSignBits);
568 DestLOI.KnownZero &= SrcLOI->KnownZero;
569 DestLOI.KnownOne &= SrcLOI->KnownOne;
573 /// setArgumentFrameIndex - Record frame index for the byval
574 /// argument. This overrides previous frame index entry for this argument,
576 void FunctionLoweringInfo::setArgumentFrameIndex(const Argument *A,
578 ByValArgFrameIndexMap[A] = FI;
581 /// getArgumentFrameIndex - Get frame index for the byval argument.
582 /// If the argument does not have any assigned frame index then 0 is
584 int FunctionLoweringInfo::getArgumentFrameIndex(const Argument *A) {
585 DenseMap<const Argument *, int>::iterator I =
586 ByValArgFrameIndexMap.find(A);
587 if (I != ByValArgFrameIndexMap.end())
589 DEBUG(dbgs() << "Argument does not have assigned frame index!\n");
593 /// ComputeUsesVAFloatArgument - Determine if any floating-point values are
594 /// being passed to this variadic function, and set the MachineModuleInfo's
595 /// usesVAFloatArgument flag if so. This flag is used to emit an undefined
596 /// reference to _fltused on Windows, which will link in MSVCRT's
597 /// floating-point support.
598 void llvm::ComputeUsesVAFloatArgument(const CallInst &I,
599 MachineModuleInfo *MMI)
601 FunctionType *FT = cast<FunctionType>(
602 I.getCalledValue()->getType()->getContainedType(0));
603 if (FT->isVarArg() && !MMI->usesVAFloatArgument()) {
604 for (unsigned i = 0, e = I.getNumArgOperands(); i != e; ++i) {
605 Type* T = I.getArgOperand(i)->getType();
606 for (po_iterator<Type*> i = po_begin(T), e = po_end(T);
608 if (i->isFloatingPointTy()) {
609 MMI->setUsesVAFloatArgument(true);
617 /// AddLandingPadInfo - Extract the exception handling information from the
618 /// landingpad instruction and add them to the specified machine module info.
619 void llvm::AddLandingPadInfo(const LandingPadInst &I, MachineModuleInfo &MMI,
620 MachineBasicBlock *MBB) {
621 MMI.addPersonality(MBB,
622 cast<Function>(I.getPersonalityFn()->stripPointerCasts()));
627 // FIXME: New EH - Add the clauses in reverse order. This isn't 100% correct,
628 // but we need to do it this way because of how the DWARF EH emitter
629 // processes the clauses.
630 for (unsigned i = I.getNumClauses(); i != 0; --i) {
631 Value *Val = I.getClause(i - 1);
632 if (I.isCatch(i - 1)) {
633 MMI.addCatchTypeInfo(MBB,
634 dyn_cast<GlobalValue>(Val->stripPointerCasts()));
636 // Add filters in a list.
637 Constant *CVal = cast<Constant>(Val);
638 SmallVector<const GlobalValue*, 4> FilterList;
639 for (User::op_iterator
640 II = CVal->op_begin(), IE = CVal->op_end(); II != IE; ++II)
641 FilterList.push_back(cast<GlobalValue>((*II)->stripPointerCasts()));
643 MMI.addFilterTypeInfo(MBB, FilterList);