/tmp/buildd/llvm-toolchain-snapshot-3.7~svn240924/lib/CodeGen/WinEHPrepare.cpp

Bug Summary

File:	lib/CodeGen/WinEHPrepare.cpp
Location:	line 2412, column 21
Description:	Value stored to 'SuccBB' during its initialization is never read

Annotated Source Code

1	//===-- WinEHPrepare - Prepare exception handling for code generation ---===//
2	//
3	// The LLVM Compiler Infrastructure
4	//
5	// This file is distributed under the University of Illinois Open Source
6	// License. See LICENSE.TXT for details.
7	//
8	//===----------------------------------------------------------------------===//
9	//
10	// This pass lowers LLVM IR exception handling into something closer to what the
11	// backend wants for functions using a personality function from a runtime
12	// provided by MSVC. Functions with other personality functions are left alone
13	// and may be prepared by other passes. In particular, all supported MSVC
14	// personality functions require cleanup code to be outlined, and the C++
15	// personality requires catch handler code to be outlined.
16	//
17	//===----------------------------------------------------------------------===//
18
19	#include "llvm/CodeGen/Passes.h"
20	#include "llvm/ADT/MapVector.h"
21	#include "llvm/ADT/STLExtras.h"
22	#include "llvm/ADT/SmallSet.h"
23	#include "llvm/ADT/SetVector.h"
24	#include "llvm/ADT/Triple.h"
25	#include "llvm/ADT/TinyPtrVector.h"
26	#include "llvm/Analysis/LibCallSemantics.h"
27	#include "llvm/Analysis/TargetLibraryInfo.h"
28	#include "llvm/CodeGen/WinEHFuncInfo.h"
29	#include "llvm/IR/Dominators.h"
30	#include "llvm/IR/Function.h"
31	#include "llvm/IR/IRBuilder.h"
32	#include "llvm/IR/Instructions.h"
33	#include "llvm/IR/IntrinsicInst.h"
34	#include "llvm/IR/Module.h"
35	#include "llvm/IR/PatternMatch.h"
36	#include "llvm/Pass.h"
37	#include "llvm/Support/Debug.h"
38	#include "llvm/Support/raw_ostream.h"
39	#include "llvm/Transforms/Utils/BasicBlockUtils.h"
40	#include "llvm/Transforms/Utils/Cloning.h"
41	#include "llvm/Transforms/Utils/Local.h"
42	#include "llvm/Transforms/Utils/PromoteMemToReg.h"
43	#include <memory>
44
45	using namespace llvm;
46	using namespace llvm::PatternMatch;
47
48	#define DEBUG_TYPE"winehprepare" "winehprepare"
49
50	namespace {
51
52	// This map is used to model frame variable usage during outlining, to
53	// construct a structure type to hold the frame variables in a frame
54	// allocation block, and to remap the frame variable allocas (including
55	// spill locations as needed) to GEPs that get the variable from the
56	// frame allocation structure.
57	typedef MapVector<Value , TinyPtrVector<AllocaInst >> FrameVarInfoMap;
58
59	// TinyPtrVector cannot hold nullptr, so we need our own sentinel that isn't
60	// quite null.
61	AllocaInst *getCatchObjectSentinel() {
62	return static_cast<AllocaInst *>(nullptr) + 1;
63	}
64
65	typedef SmallSet<BasicBlock *, 4> VisitedBlockSet;
66
67	class LandingPadActions;
68	class LandingPadMap;
69
70	typedef DenseMap<const BasicBlock , CatchHandler > CatchHandlerMapTy;
71	typedef DenseMap<const BasicBlock , CleanupHandler > CleanupHandlerMapTy;
72
73	class WinEHPrepare : public FunctionPass {
74	public:
75	static char ID; // Pass identification, replacement for typeid.
76	WinEHPrepare(const TargetMachine *TM = nullptr)
77	: FunctionPass(ID) {
78	if (TM)
79	TheTriple = TM->getTargetTriple();
80	}
81
82	bool runOnFunction(Function &Fn) override;
83
84	bool doFinalization(Module &M) override;
85
86	void getAnalysisUsage(AnalysisUsage &AU) const override;
87
88	const char *getPassName() const override {
89	return "Windows exception handling preparation";
90	}
91
92	private:
93	bool prepareExceptionHandlers(Function &F,
94	SmallVectorImpl<LandingPadInst *> &LPads);
95	void identifyEHBlocks(Function &F, SmallVectorImpl<LandingPadInst *> &LPads);
96	void promoteLandingPadValues(LandingPadInst *LPad);
97	void demoteValuesLiveAcrossHandlers(Function &F,
98	SmallVectorImpl<LandingPadInst *> &LPads);
99	void findSEHEHReturnPoints(Function &F,
100	SetVector<BasicBlock *> &EHReturnBlocks);
101	void findCXXEHReturnPoints(Function &F,
102	SetVector<BasicBlock *> &EHReturnBlocks);
103	void getPossibleReturnTargets(Function ParentF, Function HandlerF,
104	SetVector<BasicBlock*> &Targets);
105	void completeNestedLandingPad(Function *ParentFn,
106	LandingPadInst *OutlinedLPad,
107	const LandingPadInst *OriginalLPad,
108	FrameVarInfoMap &VarInfo);
109	Function createHandlerFunc(Type RetTy, const Twine &Name, Module *M,
110	Value *&ParentFP);
111	bool outlineHandler(ActionHandler Action, Function SrcFn,
112	LandingPadInst LPad, BasicBlock StartBB,
113	FrameVarInfoMap &VarInfo);
114	void addStubInvokeToHandlerIfNeeded(Function *Handler);
115
116	void mapLandingPadBlocks(LandingPadInst *LPad, LandingPadActions &Actions);
117	CatchHandler findCatchHandler(BasicBlock BB, BasicBlock *&NextBB,
118	VisitedBlockSet &VisitedBlocks);
119	void findCleanupHandlers(LandingPadActions &Actions, BasicBlock *StartBB,
120	BasicBlock *EndBB);
121
122	void processSEHCatchHandler(CatchHandler Handler, BasicBlock StartBB);
123
124	Triple TheTriple;
125
126	// All fields are reset by runOnFunction.
127	DominatorTree *DT = nullptr;
128	const TargetLibraryInfo *LibInfo = nullptr;
129	EHPersonality Personality = EHPersonality::Unknown;
130	CatchHandlerMapTy CatchHandlerMap;
131	CleanupHandlerMapTy CleanupHandlerMap;
132	DenseMap<const LandingPadInst *, LandingPadMap> LPadMaps;
133	SmallPtrSet<BasicBlock *, 4> NormalBlocks;
134	SmallPtrSet<BasicBlock *, 4> EHBlocks;
135	SetVector<BasicBlock *> EHReturnBlocks;
136
137	// This maps landing pad instructions found in outlined handlers to
138	// the landing pad instruction in the parent function from which they
139	// were cloned. The cloned/nested landing pad is used as the key
140	// because the landing pad may be cloned into multiple handlers.
141	// This map will be used to add the llvm.eh.actions call to the nested
142	// landing pads after all handlers have been outlined.
143	DenseMap<LandingPadInst , const LandingPadInst > NestedLPtoOriginalLP;
144
145	// This maps blocks in the parent function which are destinations of
146	// catch handlers to cloned blocks in (other) outlined handlers. This
147	// handles the case where a nested landing pads has a catch handler that
148	// returns to a handler function rather than the parent function.
149	// The original block is used as the key here because there should only
150	// ever be one handler function from which the cloned block is not pruned.
151	// The original block will be pruned from the parent function after all
152	// handlers have been outlined. This map will be used to adjust the
153	// return instructions of handlers which return to the block that was
154	// outlined into a handler. This is done after all handlers have been
155	// outlined but before the outlined code is pruned from the parent function.
156	DenseMap<const BasicBlock , BasicBlock > LPadTargetBlocks;
157
158	// Map from outlined handler to call to llvm.frameaddress(1). Only used for
159	// 32-bit EH.
160	DenseMap<Function , Value > HandlerToParentFP;
161
162	AllocaInst *SEHExceptionCodeSlot = nullptr;
163	};
164
165	class WinEHFrameVariableMaterializer : public ValueMaterializer {
166	public:
167	WinEHFrameVariableMaterializer(Function OutlinedFn, Value ParentFP,
168	FrameVarInfoMap &FrameVarInfo);
169	~WinEHFrameVariableMaterializer() override {}
170
171	Value materializeValueFor(Value V) override;
172
173	void escapeCatchObject(Value *V);
174
175	private:
176	FrameVarInfoMap &FrameVarInfo;
177	IRBuilder<> Builder;
178	};
179
180	class LandingPadMap {
181	public:
182	LandingPadMap() : OriginLPad(nullptr) {}
183	void mapLandingPad(const LandingPadInst *LPad);
184
185	bool isInitialized() { return OriginLPad != nullptr; }
186
187	bool isOriginLandingPadBlock(const BasicBlock *BB) const;
188	bool isLandingPadSpecificInst(const Instruction *Inst) const;
189
190	void remapEHValues(ValueToValueMapTy &VMap, Value *EHPtrValue,
191	Value *SelectorValue) const;
192
193	private:
194	const LandingPadInst *OriginLPad;
195	// We will normally only see one of each of these instructions, but
196	// if more than one occurs for some reason we can handle that.
197	TinyPtrVector<const ExtractValueInst *> ExtractedEHPtrs;
198	TinyPtrVector<const ExtractValueInst *> ExtractedSelectors;
199	};
200
201	class WinEHCloningDirectorBase : public CloningDirector {
202	public:
203	WinEHCloningDirectorBase(Function HandlerFn, Value ParentFP,
204	FrameVarInfoMap &VarInfo, LandingPadMap &LPadMap)
205	: Materializer(HandlerFn, ParentFP, VarInfo),
206	SelectorIDType(Type::getInt32Ty(HandlerFn->getContext())),
207	Int8PtrType(Type::getInt8PtrTy(HandlerFn->getContext())),
208	LPadMap(LPadMap), ParentFP(ParentFP) {}
209
210	CloningAction handleInstruction(ValueToValueMapTy &VMap,
211	const Instruction *Inst,
212	BasicBlock *NewBB) override;
213
214	virtual CloningAction handleBeginCatch(ValueToValueMapTy &VMap,
215	const Instruction *Inst,
216	BasicBlock *NewBB) = 0;
217	virtual CloningAction handleEndCatch(ValueToValueMapTy &VMap,
218	const Instruction *Inst,
219	BasicBlock *NewBB) = 0;
220	virtual CloningAction handleTypeIdFor(ValueToValueMapTy &VMap,
221	const Instruction *Inst,
222	BasicBlock *NewBB) = 0;
223	virtual CloningAction handleIndirectBr(ValueToValueMapTy &VMap,
224	const IndirectBrInst *IBr,
225	BasicBlock *NewBB) = 0;
226	virtual CloningAction handleInvoke(ValueToValueMapTy &VMap,
227	const InvokeInst *Invoke,
228	BasicBlock *NewBB) = 0;
229	virtual CloningAction handleResume(ValueToValueMapTy &VMap,
230	const ResumeInst *Resume,
231	BasicBlock *NewBB) = 0;
232	virtual CloningAction handleCompare(ValueToValueMapTy &VMap,
233	const CmpInst *Compare,
234	BasicBlock *NewBB) = 0;
235	virtual CloningAction handleLandingPad(ValueToValueMapTy &VMap,
236	const LandingPadInst *LPad,
237	BasicBlock *NewBB) = 0;
238
239	ValueMaterializer *getValueMaterializer() override { return &Materializer; }
240
241	protected:
242	WinEHFrameVariableMaterializer Materializer;
243	Type *SelectorIDType;
244	Type *Int8PtrType;
245	LandingPadMap &LPadMap;
246
247	/// The value representing the parent frame pointer.
248	Value *ParentFP;
249	};
250
251	class WinEHCatchDirector : public WinEHCloningDirectorBase {
252	public:
253	WinEHCatchDirector(
254	Function CatchFn, Value ParentFP, Value *Selector,
255	FrameVarInfoMap &VarInfo, LandingPadMap &LPadMap,
256	DenseMap<LandingPadInst , const LandingPadInst > &NestedLPads,
257	DominatorTree DT, SmallPtrSetImpl<BasicBlock > &EHBlocks)
258	: WinEHCloningDirectorBase(CatchFn, ParentFP, VarInfo, LPadMap),
259	CurrentSelector(Selector->stripPointerCasts()),
260	ExceptionObjectVar(nullptr), NestedLPtoOriginalLP(NestedLPads),
261	DT(DT), EHBlocks(EHBlocks) {}
262
263	CloningAction handleBeginCatch(ValueToValueMapTy &VMap,
264	const Instruction *Inst,
265	BasicBlock *NewBB) override;
266	CloningAction handleEndCatch(ValueToValueMapTy &VMap, const Instruction *Inst,
267	BasicBlock *NewBB) override;
268	CloningAction handleTypeIdFor(ValueToValueMapTy &VMap,
269	const Instruction *Inst,
270	BasicBlock *NewBB) override;
271	CloningAction handleIndirectBr(ValueToValueMapTy &VMap,
272	const IndirectBrInst *IBr,
273	BasicBlock *NewBB) override;
274	CloningAction handleInvoke(ValueToValueMapTy &VMap, const InvokeInst *Invoke,
275	BasicBlock *NewBB) override;
276	CloningAction handleResume(ValueToValueMapTy &VMap, const ResumeInst *Resume,
277	BasicBlock *NewBB) override;
278	CloningAction handleCompare(ValueToValueMapTy &VMap, const CmpInst *Compare,
279	BasicBlock *NewBB) override;
280	CloningAction handleLandingPad(ValueToValueMapTy &VMap,
281	const LandingPadInst *LPad,
282	BasicBlock *NewBB) override;
283
284	Value *getExceptionVar() { return ExceptionObjectVar; }
285	TinyPtrVector<BasicBlock *> &getReturnTargets() { return ReturnTargets; }
286
287	private:
288	Value *CurrentSelector;
289
290	Value *ExceptionObjectVar;
291	TinyPtrVector<BasicBlock *> ReturnTargets;
292
293	// This will be a reference to the field of the same name in the WinEHPrepare
294	// object which instantiates this WinEHCatchDirector object.
295	DenseMap<LandingPadInst , const LandingPadInst > &NestedLPtoOriginalLP;
296	DominatorTree *DT;
297	SmallPtrSetImpl<BasicBlock *> &EHBlocks;
298	};
299
300	class WinEHCleanupDirector : public WinEHCloningDirectorBase {
301	public:
302	WinEHCleanupDirector(Function CleanupFn, Value ParentFP,
303	FrameVarInfoMap &VarInfo, LandingPadMap &LPadMap)
304	: WinEHCloningDirectorBase(CleanupFn, ParentFP, VarInfo,
305	LPadMap) {}
306
307	CloningAction handleBeginCatch(ValueToValueMapTy &VMap,
308	const Instruction *Inst,
309	BasicBlock *NewBB) override;
310	CloningAction handleEndCatch(ValueToValueMapTy &VMap, const Instruction *Inst,
311	BasicBlock *NewBB) override;
312	CloningAction handleTypeIdFor(ValueToValueMapTy &VMap,
313	const Instruction *Inst,
314	BasicBlock *NewBB) override;
315	CloningAction handleIndirectBr(ValueToValueMapTy &VMap,
316	const IndirectBrInst *IBr,
317	BasicBlock *NewBB) override;
318	CloningAction handleInvoke(ValueToValueMapTy &VMap, const InvokeInst *Invoke,
319	BasicBlock *NewBB) override;
320	CloningAction handleResume(ValueToValueMapTy &VMap, const ResumeInst *Resume,
321	BasicBlock *NewBB) override;
322	CloningAction handleCompare(ValueToValueMapTy &VMap, const CmpInst *Compare,
323	BasicBlock *NewBB) override;
324	CloningAction handleLandingPad(ValueToValueMapTy &VMap,
325	const LandingPadInst *LPad,
326	BasicBlock *NewBB) override;
327	};
328
329	class LandingPadActions {
330	public:
331	LandingPadActions() : HasCleanupHandlers(false) {}
332
333	void insertCatchHandler(CatchHandler *Action) { Actions.push_back(Action); }
334	void insertCleanupHandler(CleanupHandler *Action) {
335	Actions.push_back(Action);
336	HasCleanupHandlers = true;
337	}
338
339	bool includesCleanup() const { return HasCleanupHandlers; }
340
341	SmallVectorImpl<ActionHandler *> &actions() { return Actions; }
342	SmallVectorImpl<ActionHandler *>::iterator begin() { return Actions.begin(); }
343	SmallVectorImpl<ActionHandler *>::iterator end() { return Actions.end(); }
344
345	private:
346	// Note that this class does not own the ActionHandler objects in this vector.
347	// The ActionHandlers are owned by the CatchHandlerMap and CleanupHandlerMap
348	// in the WinEHPrepare class.
349	SmallVector<ActionHandler *, 4> Actions;
350	bool HasCleanupHandlers;
351	};
352
353	} // end anonymous namespace
354
355	char WinEHPrepare::ID = 0;
356	INITIALIZE_TM_PASS(WinEHPrepare, "winehprepare", "Prepare Windows exceptions",static void* initializeWinEHPreparePassOnce(PassRegistry & Registry) { PassInfo PI = new PassInfo("Prepare Windows exceptions" , "winehprepare", & WinEHPrepare ::ID, PassInfo::NormalCtor_t (callDefaultCtor< WinEHPrepare >), false, false, PassInfo ::TargetMachineCtor_t(callTargetMachineCtor< WinEHPrepare > )); Registry.registerPass(PI, true); return PI; } void llvm:: initializeWinEHPreparePass(PassRegistry &Registry) { static volatile sys::cas_flag initialized = 0; sys::cas_flag old_val = sys::CompareAndSwap(&initialized, 1, 0); if (old_val == 0) { initializeWinEHPreparePassOnce(Registry); sys::MemoryFence (); AnnotateIgnoreWritesBegin("/tmp/buildd/llvm-toolchain-snapshot-3.7~svn240924/lib/CodeGen/WinEHPrepare.cpp" , 357); AnnotateHappensBefore("/tmp/buildd/llvm-toolchain-snapshot-3.7~svn240924/lib/CodeGen/WinEHPrepare.cpp" , 357, &initialized); initialized = 2; AnnotateIgnoreWritesEnd ("/tmp/buildd/llvm-toolchain-snapshot-3.7~svn240924/lib/CodeGen/WinEHPrepare.cpp" , 357); } else { sys::cas_flag tmp = initialized; sys::MemoryFence (); while (tmp != 2) { tmp = initialized; sys::MemoryFence(); } } AnnotateHappensAfter("/tmp/buildd/llvm-toolchain-snapshot-3.7~svn240924/lib/CodeGen/WinEHPrepare.cpp" , 357, &initialized); }
357	false, false)static void* initializeWinEHPreparePassOnce(PassRegistry & Registry) { PassInfo PI = new PassInfo("Prepare Windows exceptions" , "winehprepare", & WinEHPrepare ::ID, PassInfo::NormalCtor_t (callDefaultCtor< WinEHPrepare >), false, false, PassInfo ::TargetMachineCtor_t(callTargetMachineCtor< WinEHPrepare > )); Registry.registerPass(PI, true); return PI; } void llvm:: initializeWinEHPreparePass(PassRegistry &Registry) { static volatile sys::cas_flag initialized = 0; sys::cas_flag old_val = sys::CompareAndSwap(&initialized, 1, 0); if (old_val == 0) { initializeWinEHPreparePassOnce(Registry); sys::MemoryFence (); AnnotateIgnoreWritesBegin("/tmp/buildd/llvm-toolchain-snapshot-3.7~svn240924/lib/CodeGen/WinEHPrepare.cpp" , 357); AnnotateHappensBefore("/tmp/buildd/llvm-toolchain-snapshot-3.7~svn240924/lib/CodeGen/WinEHPrepare.cpp" , 357, &initialized); initialized = 2; AnnotateIgnoreWritesEnd ("/tmp/buildd/llvm-toolchain-snapshot-3.7~svn240924/lib/CodeGen/WinEHPrepare.cpp" , 357); } else { sys::cas_flag tmp = initialized; sys::MemoryFence (); while (tmp != 2) { tmp = initialized; sys::MemoryFence(); } } AnnotateHappensAfter("/tmp/buildd/llvm-toolchain-snapshot-3.7~svn240924/lib/CodeGen/WinEHPrepare.cpp" , 357, &initialized); }
358
359	FunctionPass llvm::createWinEHPass(const TargetMachine TM) {
360	return new WinEHPrepare(TM);
361	}
362
363	bool WinEHPrepare::runOnFunction(Function &Fn) {
364	// No need to prepare outlined handlers.
365	if (Fn.hasFnAttribute("wineh-parent"))
366	return false;
367
368	SmallVector<LandingPadInst *, 4> LPads;
369	SmallVector<ResumeInst *, 4> Resumes;
370	for (BasicBlock &BB : Fn) {
371	if (auto *LP = BB.getLandingPadInst())
372	LPads.push_back(LP);
373	if (auto *Resume = dyn_cast<ResumeInst>(BB.getTerminator()))
374	Resumes.push_back(Resume);
375	}
376
377	// No need to prepare functions that lack landing pads.
378	if (LPads.empty())
379	return false;
380
381	// Classify the personality to see what kind of preparation we need.
382	Personality = classifyEHPersonality(Fn.getPersonalityFn());
383
384	// Do nothing if this is not an MSVC personality.
385	if (!isMSVCEHPersonality(Personality))
386	return false;
387
388	DT = &getAnalysis<DominatorTreeWrapperPass>().getDomTree();
389	LibInfo = &getAnalysis<TargetLibraryInfoWrapperPass>().getTLI();
390
391	// If there were any landing pads, prepareExceptionHandlers will make changes.
392	prepareExceptionHandlers(Fn, LPads);
393	return true;
394	}
395
396	bool WinEHPrepare::doFinalization(Module &M) { return false; }
397
398	void WinEHPrepare::getAnalysisUsage(AnalysisUsage &AU) const {
399	AU.addRequired<DominatorTreeWrapperPass>();
400	AU.addRequired<TargetLibraryInfoWrapperPass>();
401	}
402
403	static bool isSelectorDispatch(BasicBlock BB, BasicBlock &CatchHandler,
404	Constant &Selector, BasicBlock &NextBB);
405
406	// Finds blocks reachable from the starting set Worklist. Does not follow unwind
407	// edges or blocks listed in StopPoints.
408	static void findReachableBlocks(SmallPtrSetImpl<BasicBlock *> &ReachableBBs,
409	SetVector<BasicBlock *> &Worklist,
410	const SetVector<BasicBlock > StopPoints) {
411	while (!Worklist.empty()) {
412	BasicBlock *BB = Worklist.pop_back_val();
413
414	// Don't cross blocks that we should stop at.
415	if (StopPoints && StopPoints->count(BB))
416	continue;
417
418	if (!ReachableBBs.insert(BB).second)
419	continue; // Already visited.
420
421	// Don't follow unwind edges of invokes.
422	if (auto *II = dyn_cast<InvokeInst>(BB->getTerminator())) {
423	Worklist.insert(II->getNormalDest());
424	continue;
425	}
426
427	// Otherwise, follow all successors.
428	Worklist.insert(succ_begin(BB), succ_end(BB));
429	}
430	}
431
432	// Attempt to find an instruction where a block can be split before
433	// a call to llvm.eh.begincatch and its operands. If the block
434	// begins with the begincatch call or one of its adjacent operands
435	// the block will not be split.
436	static Instruction findBeginCatchSplitPoint(BasicBlock BB,
437	IntrinsicInst *II) {
438	// If the begincatch call is already the first instruction in the block,
439	// don't split.
440	Instruction *FirstNonPHI = BB->getFirstNonPHI();
441	if (II == FirstNonPHI)
442	return nullptr;
443
444	// If either operand is in the same basic block as the instruction and
445	// isn't used by another instruction before the begincatch call, include it
446	// in the split block.
447	auto *Op0 = dyn_cast<Instruction>(II->getOperand(0));
448	auto *Op1 = dyn_cast<Instruction>(II->getOperand(1));
449
450	Instruction *I = II->getPrevNode();
451	Instruction *LastI = II;
452
453	while (I == Op0 \|\| I == Op1) {
454	// If the block begins with one of the operands and there are no other
455	// instructions between the operand and the begincatch call, don't split.
456	if (I == FirstNonPHI)
457	return nullptr;
458
459	LastI = I;
460	I = I->getPrevNode();
461	}
462
463	// If there is at least one instruction in the block before the begincatch
464	// call and its operands, split the block at either the begincatch or
465	// its operand.
466	return LastI;
467	}
468
469	/// Find all points where exceptional control rejoins normal control flow via
470	/// llvm.eh.endcatch. Add them to the normal bb reachability worklist.
471	void WinEHPrepare::findCXXEHReturnPoints(
472	Function &F, SetVector<BasicBlock *> &EHReturnBlocks) {
473	for (auto BBI = F.begin(), BBE = F.end(); BBI != BBE; ++BBI) {
474	BasicBlock *BB = BBI;
475	for (Instruction &I : *BB) {
476	if (match(&I, m_Intrinsic<Intrinsic::eh_begincatch>())) {
477	Instruction *SplitPt =
478	findBeginCatchSplitPoint(BB, cast<IntrinsicInst>(&I));
479	if (SplitPt) {
480	// Split the block before the llvm.eh.begincatch call to allow
481	// cleanup and catch code to be distinguished later.
482	// Do not update BBI because we still need to process the
483	// portion of the block that we are splitting off.
484	SplitBlock(BB, SplitPt, DT);
485	break;
486	}
487	}
488	if (match(&I, m_Intrinsic<Intrinsic::eh_endcatch>())) {
489	// Split the block after the call to llvm.eh.endcatch if there is
490	// anything other than an unconditional branch, or if the successor
491	// starts with a phi.
492	auto *Br = dyn_cast<BranchInst>(I.getNextNode());
493	if (!Br \|\| !Br->isUnconditional() \|\|
494	isa<PHINode>(Br->getSuccessor(0)->begin())) {
495	DEBUG(dbgs() << "splitting block " << BB->getName()do { if (::llvm::DebugFlag && ::llvm::isCurrentDebugType ("winehprepare")) { dbgs() << "splitting block " << BB->getName() << " with llvm.eh.endcatch\n"; } } while (0)
496	<< " with llvm.eh.endcatch\n")do { if (::llvm::DebugFlag && ::llvm::isCurrentDebugType ("winehprepare")) { dbgs() << "splitting block " << BB->getName() << " with llvm.eh.endcatch\n"; } } while (0);
497	BBI = SplitBlock(BB, I.getNextNode(), DT);
498	}
499	// The next BB is normal control flow.
500	EHReturnBlocks.insert(BB->getTerminator()->getSuccessor(0));
501	break;
502	}
503	}
504	}
505	}
506
507	static bool isCatchAllLandingPad(const BasicBlock *BB) {
508	const LandingPadInst *LP = BB->getLandingPadInst();
509	if (!LP)
510	return false;
511	unsigned N = LP->getNumClauses();
512	return (N > 0 && LP->isCatch(N - 1) &&
513	isa<ConstantPointerNull>(LP->getClause(N - 1)));
514	}
515
516	/// Find all points where exceptions control rejoins normal control flow via
517	/// selector dispatch.
518	void WinEHPrepare::findSEHEHReturnPoints(
519	Function &F, SetVector<BasicBlock *> &EHReturnBlocks) {
520	for (auto BBI = F.begin(), BBE = F.end(); BBI != BBE; ++BBI) {
521	BasicBlock *BB = BBI;
522	// If the landingpad is a catch-all, treat the whole lpad as if it is
523	// reachable from normal control flow.
524	// FIXME: This is imprecise. We need a better way of identifying where a
525	// catch-all starts and cleanups stop. As far as LLVM is concerned, there
526	// is no difference.
527	if (isCatchAllLandingPad(BB)) {
528	EHReturnBlocks.insert(BB);
529	continue;
530	}
531
532	BasicBlock *CatchHandler;
533	BasicBlock *NextBB;
534	Constant *Selector;
535	if (isSelectorDispatch(BB, CatchHandler, Selector, NextBB)) {
536	// Split the edge if there is a phi node. Returning from EH to a phi node
537	// is just as impossible as having a phi after an indirectbr.
538	if (isa<PHINode>(CatchHandler->begin())) {
539	DEBUG(dbgs() << "splitting EH return edge from " << BB->getName()do { if (::llvm::DebugFlag && ::llvm::isCurrentDebugType ("winehprepare")) { dbgs() << "splitting EH return edge from " << BB->getName() << " to " << CatchHandler ->getName() << '\n'; } } while (0)
540	<< " to " << CatchHandler->getName() << '\n')do { if (::llvm::DebugFlag && ::llvm::isCurrentDebugType ("winehprepare")) { dbgs() << "splitting EH return edge from " << BB->getName() << " to " << CatchHandler ->getName() << '\n'; } } while (0);
541	BBI = CatchHandler = SplitCriticalEdge(
542	BB, std::find(succ_begin(BB), succ_end(BB), CatchHandler));
543	}
544	EHReturnBlocks.insert(CatchHandler);
545	}
546	}
547	}
548
549	void WinEHPrepare::identifyEHBlocks(Function &F,
550	SmallVectorImpl<LandingPadInst *> &LPads) {
551	DEBUG(dbgs() << "Demoting values live across exception handlers in function "do { if (::llvm::DebugFlag && ::llvm::isCurrentDebugType ("winehprepare")) { dbgs() << "Demoting values live across exception handlers in function " << F.getName() << '\n'; } } while (0)
552	<< F.getName() << '\n')do { if (::llvm::DebugFlag && ::llvm::isCurrentDebugType ("winehprepare")) { dbgs() << "Demoting values live across exception handlers in function " << F.getName() << '\n'; } } while (0);
553
554	// Build a set of all non-exceptional blocks and exceptional blocks.
555	// - Non-exceptional blocks are blocks reachable from the entry block while
556	// not following invoke unwind edges.
557	// - Exceptional blocks are blocks reachable from landingpads. Analysis does
558	// not follow llvm.eh.endcatch blocks, which mark a transition from
559	// exceptional to normal control.
560
561	if (Personality == EHPersonality::MSVC_CXX)
562	findCXXEHReturnPoints(F, EHReturnBlocks);
563	else
564	findSEHEHReturnPoints(F, EHReturnBlocks);
565
566	DEBUG({do { if (::llvm::DebugFlag && ::llvm::isCurrentDebugType ("winehprepare")) { { dbgs() << "identified the following blocks as EH return points:\n" ; for (BasicBlock *BB : EHReturnBlocks) dbgs() << " " << BB->getName() << '\n'; }; } } while (0)
567	dbgs() << "identified the following blocks as EH return points:\n";do { if (::llvm::DebugFlag && ::llvm::isCurrentDebugType ("winehprepare")) { { dbgs() << "identified the following blocks as EH return points:\n" ; for (BasicBlock *BB : EHReturnBlocks) dbgs() << " " << BB->getName() << '\n'; }; } } while (0)
568	for (BasicBlock BB : EHReturnBlocks)do { if (::llvm::DebugFlag && ::llvm::isCurrentDebugType ("winehprepare")) { { dbgs() << "identified the following blocks as EH return points:\n" ; for (BasicBlock BB : EHReturnBlocks) dbgs() << " " << BB->getName() << '\n'; }; } } while (0)
569	dbgs() << " " << BB->getName() << '\n';do { if (::llvm::DebugFlag && ::llvm::isCurrentDebugType ("winehprepare")) { { dbgs() << "identified the following blocks as EH return points:\n" ; for (BasicBlock *BB : EHReturnBlocks) dbgs() << " " << BB->getName() << '\n'; }; } } while (0)
570	})do { if (::llvm::DebugFlag && ::llvm::isCurrentDebugType ("winehprepare")) { { dbgs() << "identified the following blocks as EH return points:\n" ; for (BasicBlock *BB : EHReturnBlocks) dbgs() << " " << BB->getName() << '\n'; }; } } while (0);
571
572	// Join points should not have phis at this point, unless they are a
573	// landingpad, in which case we will demote their phis later.
574	#ifndef NDEBUG
575	for (BasicBlock *BB : EHReturnBlocks)
576	assert((BB->isLandingPad() \|\| !isa<PHINode>(BB->begin())) &&(((BB->isLandingPad() \|\| !isa<PHINode>(BB->begin( ))) && "non-lpad EH return block has phi") ? static_cast <void> (0) : __assert_fail ("(BB->isLandingPad() \|\| !isa<PHINode>(BB->begin())) && \"non-lpad EH return block has phi\"" , "/tmp/buildd/llvm-toolchain-snapshot-3.7~svn240924/lib/CodeGen/WinEHPrepare.cpp" , 577, __PRETTY_FUNCTION__))
577	"non-lpad EH return block has phi")(((BB->isLandingPad() \|\| !isa<PHINode>(BB->begin( ))) && "non-lpad EH return block has phi") ? static_cast <void> (0) : __assert_fail ("(BB->isLandingPad() \|\| !isa<PHINode>(BB->begin())) && \"non-lpad EH return block has phi\"" , "/tmp/buildd/llvm-toolchain-snapshot-3.7~svn240924/lib/CodeGen/WinEHPrepare.cpp" , 577, __PRETTY_FUNCTION__));
578	#endif
579
580	// Normal blocks are the blocks reachable from the entry block and all EH
581	// return points.
582	SetVector<BasicBlock *> Worklist;
583	Worklist = EHReturnBlocks;
584	Worklist.insert(&F.getEntryBlock());
585	findReachableBlocks(NormalBlocks, Worklist, nullptr);
586	DEBUG({do { if (::llvm::DebugFlag && ::llvm::isCurrentDebugType ("winehprepare")) { { dbgs() << "marked the following blocks as normal:\n" ; for (BasicBlock *BB : NormalBlocks) dbgs() << " " << BB->getName() << '\n'; }; } } while (0)
587	dbgs() << "marked the following blocks as normal:\n";do { if (::llvm::DebugFlag && ::llvm::isCurrentDebugType ("winehprepare")) { { dbgs() << "marked the following blocks as normal:\n" ; for (BasicBlock *BB : NormalBlocks) dbgs() << " " << BB->getName() << '\n'; }; } } while (0)
588	for (BasicBlock BB : NormalBlocks)do { if (::llvm::DebugFlag && ::llvm::isCurrentDebugType ("winehprepare")) { { dbgs() << "marked the following blocks as normal:\n" ; for (BasicBlock BB : NormalBlocks) dbgs() << " " << BB->getName() << '\n'; }; } } while (0)
589	dbgs() << " " << BB->getName() << '\n';do { if (::llvm::DebugFlag && ::llvm::isCurrentDebugType ("winehprepare")) { { dbgs() << "marked the following blocks as normal:\n" ; for (BasicBlock *BB : NormalBlocks) dbgs() << " " << BB->getName() << '\n'; }; } } while (0)
590	})do { if (::llvm::DebugFlag && ::llvm::isCurrentDebugType ("winehprepare")) { { dbgs() << "marked the following blocks as normal:\n" ; for (BasicBlock *BB : NormalBlocks) dbgs() << " " << BB->getName() << '\n'; }; } } while (0);
591
592	// Exceptional blocks are the blocks reachable from landingpads that don't
593	// cross EH return points.
594	Worklist.clear();
595	for (auto *LPI : LPads)
596	Worklist.insert(LPI->getParent());
597	findReachableBlocks(EHBlocks, Worklist, &EHReturnBlocks);
598	DEBUG({do { if (::llvm::DebugFlag && ::llvm::isCurrentDebugType ("winehprepare")) { { dbgs() << "marked the following blocks as exceptional:\n" ; for (BasicBlock *BB : EHBlocks) dbgs() << " " << BB->getName() << '\n'; }; } } while (0)
599	dbgs() << "marked the following blocks as exceptional:\n";do { if (::llvm::DebugFlag && ::llvm::isCurrentDebugType ("winehprepare")) { { dbgs() << "marked the following blocks as exceptional:\n" ; for (BasicBlock *BB : EHBlocks) dbgs() << " " << BB->getName() << '\n'; }; } } while (0)
600	for (BasicBlock BB : EHBlocks)do { if (::llvm::DebugFlag && ::llvm::isCurrentDebugType ("winehprepare")) { { dbgs() << "marked the following blocks as exceptional:\n" ; for (BasicBlock BB : EHBlocks) dbgs() << " " << BB->getName() << '\n'; }; } } while (0)
601	dbgs() << " " << BB->getName() << '\n';do { if (::llvm::DebugFlag && ::llvm::isCurrentDebugType ("winehprepare")) { { dbgs() << "marked the following blocks as exceptional:\n" ; for (BasicBlock *BB : EHBlocks) dbgs() << " " << BB->getName() << '\n'; }; } } while (0)
602	})do { if (::llvm::DebugFlag && ::llvm::isCurrentDebugType ("winehprepare")) { { dbgs() << "marked the following blocks as exceptional:\n" ; for (BasicBlock *BB : EHBlocks) dbgs() << " " << BB->getName() << '\n'; }; } } while (0);
603
604	}
605
606	/// Ensure that all values live into and out of exception handlers are stored
607	/// in memory.
608	/// FIXME: This falls down when values are defined in one handler and live into
609	/// another handler. For example, a cleanup defines a value used only by a
610	/// catch handler.
611	void WinEHPrepare::demoteValuesLiveAcrossHandlers(
612	Function &F, SmallVectorImpl<LandingPadInst *> &LPads) {
613	DEBUG(dbgs() << "Demoting values live across exception handlers in function "do { if (::llvm::DebugFlag && ::llvm::isCurrentDebugType ("winehprepare")) { dbgs() << "Demoting values live across exception handlers in function " << F.getName() << '\n'; } } while (0)
614	<< F.getName() << '\n')do { if (::llvm::DebugFlag && ::llvm::isCurrentDebugType ("winehprepare")) { dbgs() << "Demoting values live across exception handlers in function " << F.getName() << '\n'; } } while (0);
615
616	// identifyEHBlocks() should have been called before this function.
617	assert(!NormalBlocks.empty())((!NormalBlocks.empty()) ? static_cast<void> (0) : __assert_fail ("!NormalBlocks.empty()", "/tmp/buildd/llvm-toolchain-snapshot-3.7~svn240924/lib/CodeGen/WinEHPrepare.cpp" , 617, __PRETTY_FUNCTION__));
618
619	SetVector<Argument *> ArgsToDemote;
620	SetVector<Instruction *> InstrsToDemote;
621	for (BasicBlock &BB : F) {
622	bool IsNormalBB = NormalBlocks.count(&BB);
623	bool IsEHBB = EHBlocks.count(&BB);
624	if (!IsNormalBB && !IsEHBB)
625	continue; // Blocks that are neither normal nor EH are unreachable.
626	for (Instruction &I : BB) {
627	for (Value *Op : I.operands()) {
628	// Don't demote static allocas, constants, and labels.
629	if (isa<Constant>(Op) \|\| isa<BasicBlock>(Op) \|\| isa<InlineAsm>(Op))
630	continue;
631	auto *AI = dyn_cast<AllocaInst>(Op);
632	if (AI && AI->isStaticAlloca())
633	continue;
634
635	if (auto *Arg = dyn_cast<Argument>(Op)) {
636	if (IsEHBB) {
637	DEBUG(dbgs() << "Demoting argument " << Argdo { if (::llvm::DebugFlag && ::llvm::isCurrentDebugType ("winehprepare")) { dbgs() << "Demoting argument " << Arg << " used by EH instr: " << I << "\n" ; } } while (0)
638	<< " used by EH instr: " << I << "\n")do { if (::llvm::DebugFlag && ::llvm::isCurrentDebugType ("winehprepare")) { dbgs() << "Demoting argument " << *Arg << " used by EH instr: " << I << "\n" ; } } while (0);
639	ArgsToDemote.insert(Arg);
640	}
641	continue;
642	}
643
644	auto *OpI = cast<Instruction>(Op);
645	BasicBlock *OpBB = OpI->getParent();
646	// If a value is produced and consumed in the same BB, we don't need to
647	// demote it.
648	if (OpBB == &BB)
649	continue;
650	bool IsOpNormalBB = NormalBlocks.count(OpBB);
651	bool IsOpEHBB = EHBlocks.count(OpBB);
652	if (IsNormalBB != IsOpNormalBB \|\| IsEHBB != IsOpEHBB) {
653	DEBUG({do { if (::llvm::DebugFlag && ::llvm::isCurrentDebugType ("winehprepare")) { { dbgs() << "Demoting instruction live in-out from EH:\n" ; dbgs() << "Instr: " << *OpI << '\n'; dbgs () << "User: " << I << '\n'; }; } } while ( 0)
654	dbgs() << "Demoting instruction live in-out from EH:\n";do { if (::llvm::DebugFlag && ::llvm::isCurrentDebugType ("winehprepare")) { { dbgs() << "Demoting instruction live in-out from EH:\n" ; dbgs() << "Instr: " << *OpI << '\n'; dbgs () << "User: " << I << '\n'; }; } } while ( 0)
655	dbgs() << "Instr: " << OpI << '\n';do { if (::llvm::DebugFlag && ::llvm::isCurrentDebugType ("winehprepare")) { { dbgs() << "Demoting instruction live in-out from EH:\n" ; dbgs() << "Instr: " << OpI << '\n'; dbgs () << "User: " << I << '\n'; }; } } while ( 0)
656	dbgs() << "User: " << I << '\n';do { if (::llvm::DebugFlag && ::llvm::isCurrentDebugType ("winehprepare")) { { dbgs() << "Demoting instruction live in-out from EH:\n" ; dbgs() << "Instr: " << *OpI << '\n'; dbgs () << "User: " << I << '\n'; }; } } while ( 0)
657	})do { if (::llvm::DebugFlag && ::llvm::isCurrentDebugType ("winehprepare")) { { dbgs() << "Demoting instruction live in-out from EH:\n" ; dbgs() << "Instr: " << *OpI << '\n'; dbgs () << "User: " << I << '\n'; }; } } while ( 0);
658	InstrsToDemote.insert(OpI);
659	}
660	}
661	}
662	}
663
664	// Demote values live into and out of handlers.
665	// FIXME: This demotion is inefficient. We should insert spills at the point
666	// of definition, insert one reload in each handler that uses the value, and
667	// insert reloads in the BB used to rejoin normal control flow.
668	Instruction *AllocaInsertPt = F.getEntryBlock().getFirstInsertionPt();
669	for (Instruction *I : InstrsToDemote)
670	DemoteRegToStack(*I, false, AllocaInsertPt);
671
672	// Demote arguments separately, and only for uses in EH blocks.
673	for (Argument *Arg : ArgsToDemote) {
674	auto *Slot = new AllocaInst(Arg->getType(), nullptr,
675	Arg->getName() + ".reg2mem", AllocaInsertPt);
676	SmallVector<User *, 4> Users(Arg->user_begin(), Arg->user_end());
677	for (User *U : Users) {
678	auto *I = dyn_cast<Instruction>(U);
679	if (I && EHBlocks.count(I->getParent())) {
680	auto *Reload = new LoadInst(Slot, Arg->getName() + ".reload", false, I);
681	U->replaceUsesOfWith(Arg, Reload);
682	}
683	}
684	new StoreInst(Arg, Slot, AllocaInsertPt);
685	}
686
687	// Demote landingpad phis, as the landingpad will be removed from the machine
688	// CFG.
689	for (LandingPadInst *LPI : LPads) {
690	BasicBlock *BB = LPI->getParent();
691	while (auto *Phi = dyn_cast<PHINode>(BB->begin()))
692	DemotePHIToStack(Phi, AllocaInsertPt);
693	}
694
695	DEBUG(dbgs() << "Demoted " << InstrsToDemote.size() << " instructions and "do { if (::llvm::DebugFlag && ::llvm::isCurrentDebugType ("winehprepare")) { dbgs() << "Demoted " << InstrsToDemote .size() << " instructions and " << ArgsToDemote.size () << " arguments for WinEHPrepare\n\n"; } } while (0)
696	<< ArgsToDemote.size() << " arguments for WinEHPrepare\n\n")do { if (::llvm::DebugFlag && ::llvm::isCurrentDebugType ("winehprepare")) { dbgs() << "Demoted " << InstrsToDemote .size() << " instructions and " << ArgsToDemote.size () << " arguments for WinEHPrepare\n\n"; } } while (0);
697	}
698
699	bool WinEHPrepare::prepareExceptionHandlers(
700	Function &F, SmallVectorImpl<LandingPadInst *> &LPads) {
701	// Don't run on functions that are already prepared.
702	for (LandingPadInst *LPad : LPads) {
703	BasicBlock *LPadBB = LPad->getParent();
704	for (Instruction &Inst : *LPadBB)
705	if (match(&Inst, m_Intrinsic<Intrinsic::eh_actions>()))
706	return false;
707	}
708
709	identifyEHBlocks(F, LPads);
710	demoteValuesLiveAcrossHandlers(F, LPads);
711
712	// These containers are used to re-map frame variables that are used in
713	// outlined catch and cleanup handlers. They will be populated as the
714	// handlers are outlined.
715	FrameVarInfoMap FrameVarInfo;
716
717	bool HandlersOutlined = false;
718
719	Module *M = F.getParent();
720	LLVMContext &Context = M->getContext();
721
722	// Create a new function to receive the handler contents.
723	PointerType *Int8PtrType = Type::getInt8PtrTy(Context);
724	Type *Int32Type = Type::getInt32Ty(Context);
725	Function *ActionIntrin = Intrinsic::getDeclaration(M, Intrinsic::eh_actions);
726
727	if (isAsynchronousEHPersonality(Personality)) {
728	// FIXME: Switch the ehptr type to i32 and then switch this.
729	SEHExceptionCodeSlot =
730	new AllocaInst(Int8PtrType, nullptr, "seh_exception_code",
731	F.getEntryBlock().getFirstInsertionPt());
732	}
733
734	// In order to handle the case where one outlined catch handler returns
735	// to a block within another outlined catch handler that would otherwise
736	// be unreachable, we need to outline the nested landing pad before we
737	// outline the landing pad which encloses it.
738	if (!isAsynchronousEHPersonality(Personality))
739	std::sort(LPads.begin(), LPads.end(),
740	[this](LandingPadInst const &L, LandingPadInst const &R) {
741	return DT->properlyDominates(R->getParent(), L->getParent());
742	});
743
744	// This container stores the llvm.eh.recover and IndirectBr instructions
745	// that make up the body of each landing pad after it has been outlined.
746	// We need to defer the population of the target list for the indirectbr
747	// until all landing pads have been outlined so that we can handle the
748	// case of blocks in the target that are reached only from nested
749	// landing pads.
750	SmallVector<std::pair<CallInst, IndirectBrInst >, 4> LPadImpls;
751
752	for (LandingPadInst *LPad : LPads) {
753	// Look for evidence that this landingpad has already been processed.
754	bool LPadHasActionList = false;
755	BasicBlock *LPadBB = LPad->getParent();
756	for (Instruction &Inst : *LPadBB) {
757	if (match(&Inst, m_Intrinsic<Intrinsic::eh_actions>())) {
758	LPadHasActionList = true;
759	break;
760	}
761	}
762
763	// If we've already outlined the handlers for this landingpad,
764	// there's nothing more to do here.
765	if (LPadHasActionList)
766	continue;
767
768	// If either of the values in the aggregate returned by the landing pad is
769	// extracted and stored to memory, promote the stored value to a register.
770	promoteLandingPadValues(LPad);
771
772	LandingPadActions Actions;
773	mapLandingPadBlocks(LPad, Actions);
774
775	HandlersOutlined \|= !Actions.actions().empty();
776	for (ActionHandler *Action : Actions) {
777	if (Action->hasBeenProcessed())
778	continue;
779	BasicBlock *StartBB = Action->getStartBlock();
780
781	// SEH doesn't do any outlining for catches. Instead, pass the handler
782	// basic block addr to llvm.eh.actions and list the block as a return
783	// target.
784	if (isAsynchronousEHPersonality(Personality)) {
785	if (auto *CatchAction = dyn_cast<CatchHandler>(Action)) {
786	processSEHCatchHandler(CatchAction, StartBB);
787	continue;
788	}
789	}
790
791	outlineHandler(Action, &F, LPad, StartBB, FrameVarInfo);
792	}
793
794	// Split the block after the landingpad instruction so that it is just a
795	// call to llvm.eh.actions followed by indirectbr.
796	assert(!isa<PHINode>(LPadBB->begin()) && "lpad phi not removed")((!isa<PHINode>(LPadBB->begin()) && "lpad phi not removed" ) ? static_cast<void> (0) : __assert_fail ("!isa<PHINode>(LPadBB->begin()) && \"lpad phi not removed\"" , "/tmp/buildd/llvm-toolchain-snapshot-3.7~svn240924/lib/CodeGen/WinEHPrepare.cpp" , 796, __PRETTY_FUNCTION__));
797	SplitBlock(LPadBB, LPad->getNextNode(), DT);
798	// Erase the branch inserted by the split so we can insert indirectbr.
799	LPadBB->getTerminator()->eraseFromParent();
800
801	// Replace all extracted values with undef and ultimately replace the
802	// landingpad with undef.
803	SmallVector<Instruction *, 4> SEHCodeUses;
804	SmallVector<Instruction *, 4> EHUndefs;
805	for (User *U : LPad->users()) {
806	auto *E = dyn_cast<ExtractValueInst>(U);
807	if (!E)
808	continue;
809	assert(E->getNumIndices() == 1 &&((E->getNumIndices() == 1 && "Unexpected operation: extracting both landing pad values" ) ? static_cast<void> (0) : __assert_fail ("E->getNumIndices() == 1 && \"Unexpected operation: extracting both landing pad values\"" , "/tmp/buildd/llvm-toolchain-snapshot-3.7~svn240924/lib/CodeGen/WinEHPrepare.cpp" , 810, __PRETTY_FUNCTION__))
810	"Unexpected operation: extracting both landing pad values")((E->getNumIndices() == 1 && "Unexpected operation: extracting both landing pad values" ) ? static_cast<void> (0) : __assert_fail ("E->getNumIndices() == 1 && \"Unexpected operation: extracting both landing pad values\"" , "/tmp/buildd/llvm-toolchain-snapshot-3.7~svn240924/lib/CodeGen/WinEHPrepare.cpp" , 810, __PRETTY_FUNCTION__));
811	unsigned Idx = *E->idx_begin();
812	assert((Idx == 0 \|\| Idx == 1) && "unexpected index")(((Idx == 0 \|\| Idx == 1) && "unexpected index") ? static_cast <void> (0) : __assert_fail ("(Idx == 0 \|\| Idx == 1) && \"unexpected index\"" , "/tmp/buildd/llvm-toolchain-snapshot-3.7~svn240924/lib/CodeGen/WinEHPrepare.cpp" , 812, __PRETTY_FUNCTION__));
813	if (Idx == 0 && isAsynchronousEHPersonality(Personality))
814	SEHCodeUses.push_back(E);
815	else
816	EHUndefs.push_back(E);
817	}
818	for (Instruction *E : EHUndefs) {
819	E->replaceAllUsesWith(UndefValue::get(E->getType()));
820	E->eraseFromParent();
821	}
822	LPad->replaceAllUsesWith(UndefValue::get(LPad->getType()));
823
824	// Rewrite uses of the exception pointer to loads of an alloca.
825	for (Instruction *E : SEHCodeUses) {
826	SmallVector<Use *, 4> Uses;
827	for (Use &U : E->uses())
828	Uses.push_back(&U);
829	for (Use *U : Uses) {
830	auto *I = cast<Instruction>(U->getUser());
831	if (isa<ResumeInst>(I))
832	continue;
833	LoadInst *LI;
834	if (auto *Phi = dyn_cast<PHINode>(I))
835	LI = new LoadInst(SEHExceptionCodeSlot, "sehcode", false,
836	Phi->getIncomingBlock(*U));
837	else
838	LI = new LoadInst(SEHExceptionCodeSlot, "sehcode", false, I);
839	U->set(LI);
840	}
841	E->replaceAllUsesWith(UndefValue::get(E->getType()));
842	E->eraseFromParent();
843	}
844
845	// Add a call to describe the actions for this landing pad.
846	std::vector<Value *> ActionArgs;
847	for (ActionHandler *Action : Actions) {
848	// Action codes from docs are: 0 cleanup, 1 catch.
849	if (auto *CatchAction = dyn_cast<CatchHandler>(Action)) {
850	ActionArgs.push_back(ConstantInt::get(Int32Type, 1));
851	ActionArgs.push_back(CatchAction->getSelector());
852	// Find the frame escape index of the exception object alloca in the
853	// parent.
854	int FrameEscapeIdx = -1;
855	Value EHObj = const_cast<Value >(CatchAction->getExceptionVar());
856	if (EHObj && !isa<ConstantPointerNull>(EHObj)) {
857	auto I = FrameVarInfo.find(EHObj);
858	assert(I != FrameVarInfo.end() &&((I != FrameVarInfo.end() && "failed to map llvm.eh.begincatch var" ) ? static_cast<void> (0) : __assert_fail ("I != FrameVarInfo.end() && \"failed to map llvm.eh.begincatch var\"" , "/tmp/buildd/llvm-toolchain-snapshot-3.7~svn240924/lib/CodeGen/WinEHPrepare.cpp" , 859, __PRETTY_FUNCTION__))
859	"failed to map llvm.eh.begincatch var")((I != FrameVarInfo.end() && "failed to map llvm.eh.begincatch var" ) ? static_cast<void> (0) : __assert_fail ("I != FrameVarInfo.end() && \"failed to map llvm.eh.begincatch var\"" , "/tmp/buildd/llvm-toolchain-snapshot-3.7~svn240924/lib/CodeGen/WinEHPrepare.cpp" , 859, __PRETTY_FUNCTION__));
860	FrameEscapeIdx = std::distance(FrameVarInfo.begin(), I);
861	}
862	ActionArgs.push_back(ConstantInt::get(Int32Type, FrameEscapeIdx));
863	} else {
864	ActionArgs.push_back(ConstantInt::get(Int32Type, 0));
865	}
866	ActionArgs.push_back(Action->getHandlerBlockOrFunc());
867	}
868	CallInst *Recover =
869	CallInst::Create(ActionIntrin, ActionArgs, "recover", LPadBB);
870
871	SetVector<BasicBlock *> ReturnTargets;
872	for (ActionHandler *Action : Actions) {
873	if (auto *CatchAction = dyn_cast<CatchHandler>(Action)) {
874	const auto &CatchTargets = CatchAction->getReturnTargets();
875	ReturnTargets.insert(CatchTargets.begin(), CatchTargets.end());
876	}
877	}
878	IndirectBrInst *Branch =
879	IndirectBrInst::Create(Recover, ReturnTargets.size(), LPadBB);
880	for (BasicBlock *Target : ReturnTargets)
881	Branch->addDestination(Target);
882
883	if (!isAsynchronousEHPersonality(Personality)) {
884	// C++ EH must repopulate the targets later to handle the case of
885	// targets that are reached indirectly through nested landing pads.
886	LPadImpls.push_back(std::make_pair(Recover, Branch));
887	}
888
889	} // End for each landingpad
890
891	// If nothing got outlined, there is no more processing to be done.
892	if (!HandlersOutlined)
893	return false;
894
895	// Replace any nested landing pad stubs with the correct action handler.
896	// This must be done before we remove unreachable blocks because it
897	// cleans up references to outlined blocks that will be deleted.
898	for (auto &LPadPair : NestedLPtoOriginalLP)
899	completeNestedLandingPad(&F, LPadPair.first, LPadPair.second, FrameVarInfo);
900	NestedLPtoOriginalLP.clear();
901
902	// Update the indirectbr instructions' target lists if necessary.
903	SetVector<BasicBlock*> CheckedTargets;
904	SmallVector<std::unique_ptr<ActionHandler>, 4> ActionList;
905	for (auto &LPadImplPair : LPadImpls) {
906	IntrinsicInst *Recover = cast<IntrinsicInst>(LPadImplPair.first);
907	IndirectBrInst *Branch = LPadImplPair.second;
908
909	// Get a list of handlers called by
910	parseEHActions(Recover, ActionList);
911
912	// Add an indirect branch listing possible successors of the catch handlers.
913	SetVector<BasicBlock *> ReturnTargets;
914	for (const auto &Action : ActionList) {
915	if (auto *CA = dyn_cast<CatchHandler>(Action.get())) {
916	Function *Handler = cast<Function>(CA->getHandlerBlockOrFunc());
917	getPossibleReturnTargets(&F, Handler, ReturnTargets);
918	}
919	}
920	ActionList.clear();
921	// Clear any targets we already knew about.
922	for (unsigned int I = 0, E = Branch->getNumDestinations(); I < E; ++I) {
923	BasicBlock *KnownTarget = Branch->getDestination(I);
924	if (ReturnTargets.count(KnownTarget))
925	ReturnTargets.remove(KnownTarget);
926	}
927	for (BasicBlock *Target : ReturnTargets) {
928	Branch->addDestination(Target);
929	// The target may be a block that we excepted to get pruned.
930	// If it is, it may contain a call to llvm.eh.endcatch.
931	if (CheckedTargets.insert(Target)) {
932	// Earlier preparations guarantee that all calls to llvm.eh.endcatch
933	// will be followed by an unconditional branch.
934	auto *Br = dyn_cast<BranchInst>(Target->getTerminator());
935	if (Br && Br->isUnconditional() &&
936	Br != Target->getFirstNonPHIOrDbgOrLifetime()) {
937	Instruction *Prev = Br->getPrevNode();
938	if (match(cast<Value>(Prev), m_Intrinsic<Intrinsic::eh_endcatch>()))
939	Prev->eraseFromParent();
940	}
941	}
942	}
943	}
944	LPadImpls.clear();
945
946	F.addFnAttr("wineh-parent", F.getName());
947
948	// Delete any blocks that were only used by handlers that were outlined above.
949	removeUnreachableBlocks(F);
950
951	BasicBlock *Entry = &F.getEntryBlock();
952	IRBuilder<> Builder(F.getParent()->getContext());
953	Builder.SetInsertPoint(Entry->getFirstInsertionPt());
954
955	Function *FrameEscapeFn =
956	Intrinsic::getDeclaration(M, Intrinsic::frameescape);
957	Function *RecoverFrameFn =
958	Intrinsic::getDeclaration(M, Intrinsic::framerecover);
959	SmallVector<Value *, 8> AllocasToEscape;
960
961	// Scan the entry block for an existing call to llvm.frameescape. We need to
962	// keep escaping those objects.
963	for (Instruction &I : F.front()) {
964	auto *II = dyn_cast<IntrinsicInst>(&I);
965	if (II && II->getIntrinsicID() == Intrinsic::frameescape) {
966	auto Args = II->arg_operands();
967	AllocasToEscape.append(Args.begin(), Args.end());
968	II->eraseFromParent();
969	break;
970	}
971	}
972
973	// Finally, replace all of the temporary allocas for frame variables used in
974	// the outlined handlers with calls to llvm.framerecover.
975	for (auto &VarInfoEntry : FrameVarInfo) {
976	Value *ParentVal = VarInfoEntry.first;
977	TinyPtrVector<AllocaInst *> &Allocas = VarInfoEntry.second;
978	AllocaInst *ParentAlloca = cast<AllocaInst>(ParentVal);
979
980	// FIXME: We should try to sink unescaped allocas from the parent frame into
981	// the child frame. If the alloca is escaped, we have to use the lifetime
982	// markers to ensure that the alloca is only live within the child frame.
983
984	// Add this alloca to the list of things to escape.
985	AllocasToEscape.push_back(ParentAlloca);
986
987	// Next replace all outlined allocas that are mapped to it.
988	for (AllocaInst *TempAlloca : Allocas) {
989	if (TempAlloca == getCatchObjectSentinel())
990	continue; // Skip catch parameter sentinels.
991	Function *HandlerFn = TempAlloca->getParent()->getParent();
992	llvm::Value *FP = HandlerToParentFP[HandlerFn];
993	assert(FP)((FP) ? static_cast<void> (0) : __assert_fail ("FP", "/tmp/buildd/llvm-toolchain-snapshot-3.7~svn240924/lib/CodeGen/WinEHPrepare.cpp" , 993, __PRETTY_FUNCTION__));
994
995	// FIXME: Sink this framerecover into the blocks where it is used.
996	Builder.SetInsertPoint(TempAlloca);
997	Builder.SetCurrentDebugLocation(TempAlloca->getDebugLoc());
998	Value *RecoverArgs[] = {
999	Builder.CreateBitCast(&F, Int8PtrType, ""), FP,
1000	llvm::ConstantInt::get(Int32Type, AllocasToEscape.size() - 1)};
1001	Instruction *RecoveredAlloca =
1002	Builder.CreateCall(RecoverFrameFn, RecoverArgs);
1003
1004	// Add a pointer bitcast if the alloca wasn't an i8.
1005	if (RecoveredAlloca->getType() != TempAlloca->getType()) {
1006	RecoveredAlloca->setName(Twine(TempAlloca->getName()) + ".i8");
1007	RecoveredAlloca = cast<Instruction>(
1008	Builder.CreateBitCast(RecoveredAlloca, TempAlloca->getType()));
1009	}
1010	TempAlloca->replaceAllUsesWith(RecoveredAlloca);
1011	TempAlloca->removeFromParent();
1012	RecoveredAlloca->takeName(TempAlloca);
1013	delete TempAlloca;
1014	}
1015	} // End for each FrameVarInfo entry.
1016
1017	// Insert 'call void (...)* @llvm.frameescape(...)' at the end of the entry
1018	// block.
1019	Builder.SetInsertPoint(&F.getEntryBlock().back());
1020	Builder.CreateCall(FrameEscapeFn, AllocasToEscape);
1021
1022	if (SEHExceptionCodeSlot) {
1023	if (isAllocaPromotable(SEHExceptionCodeSlot)) {
1024	SmallPtrSet<BasicBlock *, 4> UserBlocks;
1025	for (User *U : SEHExceptionCodeSlot->users()) {
1026	if (auto *Inst = dyn_cast<Instruction>(U))
1027	UserBlocks.insert(Inst->getParent());
1028	}
1029	PromoteMemToReg(SEHExceptionCodeSlot, *DT);
1030	// After the promotion, kill off dead instructions.
1031	for (BasicBlock *BB : UserBlocks)
1032	SimplifyInstructionsInBlock(BB, LibInfo);
1033	}
1034	}
1035
1036	// Clean up the handler action maps we created for this function
1037	DeleteContainerSeconds(CatchHandlerMap);
1038	CatchHandlerMap.clear();
1039	DeleteContainerSeconds(CleanupHandlerMap);
1040	CleanupHandlerMap.clear();
1041	HandlerToParentFP.clear();
1042	DT = nullptr;
1043	LibInfo = nullptr;
1044	SEHExceptionCodeSlot = nullptr;
1045	EHBlocks.clear();
1046	NormalBlocks.clear();
1047	EHReturnBlocks.clear();
1048
1049	return HandlersOutlined;
1050	}
1051
1052	void WinEHPrepare::promoteLandingPadValues(LandingPadInst *LPad) {
1053	// If the return values of the landing pad instruction are extracted and
1054	// stored to memory, we want to promote the store locations to reg values.
1055	SmallVector<AllocaInst *, 2> EHAllocas;
1056
1057	// The landingpad instruction returns an aggregate value. Typically, its
1058	// value will be passed to a pair of extract value instructions and the
1059	// results of those extracts are often passed to store instructions.
1060	// In unoptimized code the stored value will often be loaded and then stored
1061	// again.
1062	for (auto *U : LPad->users()) {
1063	ExtractValueInst *Extract = dyn_cast<ExtractValueInst>(U);
1064	if (!Extract)
1065	continue;
1066
1067	for (auto *EU : Extract->users()) {
1068	if (auto *Store = dyn_cast<StoreInst>(EU)) {
1069	auto *AV = cast<AllocaInst>(Store->getPointerOperand());
1070	EHAllocas.push_back(AV);
1071	}
1072	}
1073	}
1074
1075	// We can't do this without a dominator tree.
1076	assert(DT)((DT) ? static_cast<void> (0) : __assert_fail ("DT", "/tmp/buildd/llvm-toolchain-snapshot-3.7~svn240924/lib/CodeGen/WinEHPrepare.cpp" , 1076, __PRETTY_FUNCTION__));
1077
1078	if (!EHAllocas.empty()) {
1079	PromoteMemToReg(EHAllocas, *DT);
1080	EHAllocas.clear();
1081	}
1082
1083	// After promotion, some extracts may be trivially dead. Remove them.
1084	SmallVector<Value *, 4> Users(LPad->user_begin(), LPad->user_end());
1085	for (auto *U : Users)
1086	RecursivelyDeleteTriviallyDeadInstructions(U);
1087	}
1088
1089	void WinEHPrepare::getPossibleReturnTargets(Function *ParentF,
1090	Function *HandlerF,
1091	SetVector<BasicBlock*> &Targets) {
1092	for (BasicBlock &BB : *HandlerF) {
1093	// If the handler contains landing pads, check for any
1094	// handlers that may return directly to a block in the
1095	// parent function.
1096	if (auto *LPI = BB.getLandingPadInst()) {
1097	IntrinsicInst *Recover = cast<IntrinsicInst>(LPI->getNextNode());
1098	SmallVector<std::unique_ptr<ActionHandler>, 4> ActionList;
1099	parseEHActions(Recover, ActionList);
1100	for (const auto &Action : ActionList) {
1101	if (auto *CH = dyn_cast<CatchHandler>(Action.get())) {
1102	Function *NestedF = cast<Function>(CH->getHandlerBlockOrFunc());
1103	getPossibleReturnTargets(ParentF, NestedF, Targets);
1104	}
1105	}
1106	}
1107
1108	auto *Ret = dyn_cast<ReturnInst>(BB.getTerminator());
1109	if (!Ret)
1110	continue;
1111
1112	// Handler functions must always return a block address.
1113	BlockAddress *BA = cast<BlockAddress>(Ret->getReturnValue());
1114
1115	// If this is the handler for a nested landing pad, the
1116	// return address may have been remapped to a block in the
1117	// parent handler. We're not interested in those.
1118	if (BA->getFunction() != ParentF)
1119	continue;
1120
1121	Targets.insert(BA->getBasicBlock());
1122	}
1123	}
1124
1125	void WinEHPrepare::completeNestedLandingPad(Function *ParentFn,
1126	LandingPadInst *OutlinedLPad,
1127	const LandingPadInst *OriginalLPad,
1128	FrameVarInfoMap &FrameVarInfo) {
1129	// Get the nested block and erase the unreachable instruction that was
1130	// temporarily inserted as its terminator.
1131	LLVMContext &Context = ParentFn->getContext();
1132	BasicBlock *OutlinedBB = OutlinedLPad->getParent();
1133	// If the nested landing pad was outlined before the landing pad that enclosed
1134	// it, it will already be in outlined form. In that case, we just need to see
1135	// if the returns and the enclosing branch instruction need to be updated.
1136	IndirectBrInst *Branch =
1137	dyn_cast<IndirectBrInst>(OutlinedBB->getTerminator());
1138	if (!Branch) {
1139	// If the landing pad wasn't in outlined form, it should be a stub with
1140	// an unreachable terminator.
1141	assert(isa<UnreachableInst>(OutlinedBB->getTerminator()))((isa<UnreachableInst>(OutlinedBB->getTerminator())) ? static_cast<void> (0) : __assert_fail ("isa<UnreachableInst>(OutlinedBB->getTerminator())" , "/tmp/buildd/llvm-toolchain-snapshot-3.7~svn240924/lib/CodeGen/WinEHPrepare.cpp" , 1141, __PRETTY_FUNCTION__));
1142	OutlinedBB->getTerminator()->eraseFromParent();
1143	// That should leave OutlinedLPad as the last instruction in its block.
1144	assert(&OutlinedBB->back() == OutlinedLPad)((&OutlinedBB->back() == OutlinedLPad) ? static_cast< void> (0) : __assert_fail ("&OutlinedBB->back() == OutlinedLPad" , "/tmp/buildd/llvm-toolchain-snapshot-3.7~svn240924/lib/CodeGen/WinEHPrepare.cpp" , 1144, __PRETTY_FUNCTION__));
1145	}
1146
1147	// The original landing pad will have already had its action intrinsic
1148	// built by the outlining loop. We need to clone that into the outlined
1149	// location. It may also be necessary to add references to the exception
1150	// variables to the outlined handler in which this landing pad is nested
1151	// and remap return instructions in the nested handlers that should return
1152	// to an address in the outlined handler.
1153	Function *OutlinedHandlerFn = OutlinedBB->getParent();
1154	BasicBlock::const_iterator II = OriginalLPad;
1155	++II;
1156	// The instruction after the landing pad should now be a call to eh.actions.
1157	const Instruction *Recover = II;
1158	const IntrinsicInst *EHActions = cast<IntrinsicInst>(Recover);
1159
1160	// Remap the return target in the nested handler.
1161	SmallVector<BlockAddress *, 4> ActionTargets;
1162	SmallVector<std::unique_ptr<ActionHandler>, 4> ActionList;
1163	parseEHActions(EHActions, ActionList);
1164	for (const auto &Action : ActionList) {
1165	auto *Catch = dyn_cast<CatchHandler>(Action.get());
1166	if (!Catch)
1167	continue;
1168	// The dyn_cast to function here selects C++ catch handlers and skips
1169	// SEH catch handlers.
1170	auto *Handler = dyn_cast<Function>(Catch->getHandlerBlockOrFunc());
1171	if (!Handler)
1172	continue;
1173	// Visit all the return instructions, looking for places that return
1174	// to a location within OutlinedHandlerFn.
1175	for (BasicBlock &NestedHandlerBB : *Handler) {
1176	auto *Ret = dyn_cast<ReturnInst>(NestedHandlerBB.getTerminator());
1177	if (!Ret)
1178	continue;
1179
1180	// Handler functions must always return a block address.
1181	BlockAddress *BA = cast<BlockAddress>(Ret->getReturnValue());
1182	// The original target will have been in the main parent function,
1183	// but if it is the address of a block that has been outlined, it
1184	// should be a block that was outlined into OutlinedHandlerFn.
1185	assert(BA->getFunction() == ParentFn)((BA->getFunction() == ParentFn) ? static_cast<void> (0) : __assert_fail ("BA->getFunction() == ParentFn", "/tmp/buildd/llvm-toolchain-snapshot-3.7~svn240924/lib/CodeGen/WinEHPrepare.cpp" , 1185, __PRETTY_FUNCTION__));
1186
1187	// Ignore targets that aren't part of an outlined handler function.
1188	if (!LPadTargetBlocks.count(BA->getBasicBlock()))
1189	continue;
1190
1191	// If the return value is the address ofF a block that we
1192	// previously outlined into the parent handler function, replace
1193	// the return instruction and add the mapped target to the list
1194	// of possible return addresses.
1195	BasicBlock *MappedBB = LPadTargetBlocks[BA->getBasicBlock()];
1196	assert(MappedBB->getParent() == OutlinedHandlerFn)((MappedBB->getParent() == OutlinedHandlerFn) ? static_cast <void> (0) : __assert_fail ("MappedBB->getParent() == OutlinedHandlerFn" , "/tmp/buildd/llvm-toolchain-snapshot-3.7~svn240924/lib/CodeGen/WinEHPrepare.cpp" , 1196, __PRETTY_FUNCTION__));
1197	BlockAddress *NewBA = BlockAddress::get(OutlinedHandlerFn, MappedBB);
1198	Ret->eraseFromParent();
1199	ReturnInst::Create(Context, NewBA, &NestedHandlerBB);
1200	ActionTargets.push_back(NewBA);
1201	}
1202	}
1203	ActionList.clear();
1204
1205	if (Branch) {
1206	// If the landing pad was already in outlined form, just update its targets.
1207	for (unsigned int I = Branch->getNumDestinations(); I > 0; --I)
1208	Branch->removeDestination(I);
1209	// Add the previously collected action targets.
1210	for (auto *Target : ActionTargets)
1211	Branch->addDestination(Target->getBasicBlock());
1212	} else {
1213	// If the landing pad was previously stubbed out, fill in its outlined form.
1214	IntrinsicInst *NewEHActions = cast<IntrinsicInst>(EHActions->clone());
1215	OutlinedBB->getInstList().push_back(NewEHActions);
1216
1217	// Insert an indirect branch into the outlined landing pad BB.
1218	IndirectBrInst *IBr = IndirectBrInst::Create(NewEHActions, 0, OutlinedBB);
1219	// Add the previously collected action targets.
1220	for (auto *Target : ActionTargets)
1221	IBr->addDestination(Target->getBasicBlock());
1222	}
1223	}
1224
1225	// This function examines a block to determine whether the block ends with a
1226	// conditional branch to a catch handler based on a selector comparison.
1227	// This function is used both by the WinEHPrepare::findSelectorComparison() and
1228	// WinEHCleanupDirector::handleTypeIdFor().
1229	static bool isSelectorDispatch(BasicBlock BB, BasicBlock &CatchHandler,
1230	Constant &Selector, BasicBlock &NextBB) {
1231	ICmpInst::Predicate Pred;
1232	BasicBlock TBB, FBB;
1233	Value LHS, RHS;
1234
1235	if (!match(BB->getTerminator(),
1236	m_Br(m_ICmp(Pred, m_Value(LHS), m_Value(RHS)), TBB, FBB)))
1237	return false;
1238
1239	if (!match(LHS,
1240	m_Intrinsic<Intrinsic::eh_typeid_for>(m_Constant(Selector))) &&
1241	!match(RHS, m_Intrinsic<Intrinsic::eh_typeid_for>(m_Constant(Selector))))
1242	return false;
1243
1244	if (Pred == CmpInst::ICMP_EQ) {
1245	CatchHandler = TBB;
1246	NextBB = FBB;
1247	return true;
1248	}
1249
1250	if (Pred == CmpInst::ICMP_NE) {
1251	CatchHandler = FBB;
1252	NextBB = TBB;
1253	return true;
1254	}
1255
1256	return false;
1257	}
1258
1259	static bool isCatchBlock(BasicBlock *BB) {
1260	for (BasicBlock::iterator II = BB->getFirstNonPHIOrDbg(), IE = BB->end();
1261	II != IE; ++II) {
1262	if (match(cast<Value>(II), m_Intrinsic<Intrinsic::eh_begincatch>()))
1263	return true;
1264	}
1265	return false;
1266	}
1267
1268	static BasicBlock createStubLandingPad(Function Handler) {
1269	// FIXME: Finish this!
1270	LLVMContext &Context = Handler->getContext();
1271	BasicBlock *StubBB = BasicBlock::Create(Context, "stub");
1272	Handler->getBasicBlockList().push_back(StubBB);
1273	IRBuilder<> Builder(StubBB);
1274	LandingPadInst *LPad = Builder.CreateLandingPad(
1275	llvm::StructType::get(Type::getInt8PtrTy(Context),
1276	Type::getInt32Ty(Context), nullptr),
1277	0);
1278	// Insert a call to llvm.eh.actions so that we don't try to outline this lpad.
1279	Function *ActionIntrin =
1280	Intrinsic::getDeclaration(Handler->getParent(), Intrinsic::eh_actions);
1281	Builder.CreateCall(ActionIntrin, {}, "recover");
1282	LPad->setCleanup(true);
1283	Builder.CreateUnreachable();
1284	return StubBB;
1285	}
1286
1287	// Cycles through the blocks in an outlined handler function looking for an
1288	// invoke instruction and inserts an invoke of llvm.donothing with an empty
1289	// landing pad if none is found. The code that generates the .xdata tables for
1290	// the handler needs at least one landing pad to identify the parent function's
1291	// personality.
1292	void WinEHPrepare::addStubInvokeToHandlerIfNeeded(Function *Handler) {
1293	ReturnInst *Ret = nullptr;
1294	UnreachableInst *Unreached = nullptr;
1295	for (BasicBlock &BB : *Handler) {
1296	TerminatorInst *Terminator = BB.getTerminator();
1297	// If we find an invoke, there is nothing to be done.
1298	auto *II = dyn_cast<InvokeInst>(Terminator);
1299	if (II)
1300	return;
1301	// If we've already recorded a return instruction, keep looking for invokes.
1302	if (!Ret)
1303	Ret = dyn_cast<ReturnInst>(Terminator);
1304	// If we haven't recorded an unreachable instruction, try this terminator.
1305	if (!Unreached)
1306	Unreached = dyn_cast<UnreachableInst>(Terminator);
1307	}
1308
1309	// If we got this far, the handler contains no invokes. We should have seen
1310	// at least one return or unreachable instruction. We'll insert an invoke of
1311	// llvm.donothing ahead of that instruction.
1312	assert(Ret \|\| Unreached)((Ret \|\| Unreached) ? static_cast<void> (0) : __assert_fail ("Ret \|\| Unreached", "/tmp/buildd/llvm-toolchain-snapshot-3.7~svn240924/lib/CodeGen/WinEHPrepare.cpp" , 1312, __PRETTY_FUNCTION__));
1313	TerminatorInst *Term;
1314	if (Ret)
1315	Term = Ret;
1316	else
1317	Term = Unreached;
1318	BasicBlock *OldRetBB = Term->getParent();
1319	BasicBlock *NewRetBB = SplitBlock(OldRetBB, Term, DT);
1320	// SplitBlock adds an unconditional branch instruction at the end of the
1321	// parent block. We want to replace that with an invoke call, so we can
1322	// erase it now.
1323	OldRetBB->getTerminator()->eraseFromParent();
1324	BasicBlock *StubLandingPad = createStubLandingPad(Handler);
1325	Function *F =
1326	Intrinsic::getDeclaration(Handler->getParent(), Intrinsic::donothing);
1327	InvokeInst::Create(F, NewRetBB, StubLandingPad, None, "", OldRetBB);
1328	}
1329
1330	// FIXME: Consider sinking this into lib/Target/X86 somehow. TargetLowering
1331	// usually doesn't build LLVM IR, so that's probably the wrong place.
1332	Function WinEHPrepare::createHandlerFunc(Type RetTy, const Twine &Name,
1333	Module M, Value &ParentFP) {
1334	// x64 uses a two-argument prototype where the parent FP is the second
1335	// argument. x86 uses no arguments, just the incoming EBP value.
1336	LLVMContext &Context = M->getContext();
1337	FunctionType *FnType;
1338	if (TheTriple.getArch() == Triple::x86_64) {
1339	Type *Int8PtrType = Type::getInt8PtrTy(Context);
1340	Type *ArgTys[2] = {Int8PtrType, Int8PtrType};
1341	FnType = FunctionType::get(RetTy, ArgTys, false);
1342	} else {
1343	FnType = FunctionType::get(RetTy, None, false);
1344	}
1345
1346	Function *Handler =
1347	Function::Create(FnType, GlobalVariable::InternalLinkage, Name, M);
1348	BasicBlock *Entry = BasicBlock::Create(Context, "entry");
1349	Handler->getBasicBlockList().push_front(Entry);
1350	if (TheTriple.getArch() == Triple::x86_64) {
1351	ParentFP = &(Handler->getArgumentList().back());
1352	} else {
1353	assert(M)((M) ? static_cast<void> (0) : __assert_fail ("M", "/tmp/buildd/llvm-toolchain-snapshot-3.7~svn240924/lib/CodeGen/WinEHPrepare.cpp" , 1353, __PRETTY_FUNCTION__));
1354	Function *FrameAddressFn =
1355	Intrinsic::getDeclaration(M, Intrinsic::frameaddress);
1356	Value *Args[1] = {ConstantInt::get(Type::getInt32Ty(Context), 1)};
1357	ParentFP = CallInst::Create(FrameAddressFn, Args, "parent_fp",
1358	&Handler->getEntryBlock());
1359	}
1360	return Handler;
1361	}
1362
1363	bool WinEHPrepare::outlineHandler(ActionHandler Action, Function SrcFn,
1364	LandingPadInst LPad, BasicBlock StartBB,
1365	FrameVarInfoMap &VarInfo) {
1366	Module *M = SrcFn->getParent();
1367	LLVMContext &Context = M->getContext();
1368	Type *Int8PtrType = Type::getInt8PtrTy(Context);
1369
1370	// Create a new function to receive the handler contents.
1371	Value *ParentFP;
1372	Function *Handler;
1373	if (Action->getType() == Catch) {
1374	Handler = createHandlerFunc(Int8PtrType, SrcFn->getName() + ".catch", M,
1375	ParentFP);
1376	} else {
1377	Handler = createHandlerFunc(Type::getVoidTy(Context),
1378	SrcFn->getName() + ".cleanup", M, ParentFP);
1379	}
1380	Handler->setPersonalityFn(SrcFn->getPersonalityFn());
1381	HandlerToParentFP[Handler] = ParentFP;
1382	Handler->addFnAttr("wineh-parent", SrcFn->getName());
1383	BasicBlock *Entry = &Handler->getEntryBlock();
1384
1385	// Generate a standard prolog to setup the frame recovery structure.
1386	IRBuilder<> Builder(Context);
1387	Builder.SetInsertPoint(Entry);
1388	Builder.SetCurrentDebugLocation(LPad->getDebugLoc());
1389
1390	std::unique_ptr<WinEHCloningDirectorBase> Director;
1391
1392	ValueToValueMapTy VMap;
1393
1394	LandingPadMap &LPadMap = LPadMaps[LPad];
1395	if (!LPadMap.isInitialized())
1396	LPadMap.mapLandingPad(LPad);
1397	if (auto *CatchAction = dyn_cast<CatchHandler>(Action)) {
1398	Constant *Sel = CatchAction->getSelector();
1399	Director.reset(new WinEHCatchDirector(Handler, ParentFP, Sel, VarInfo,
1400	LPadMap, NestedLPtoOriginalLP, DT,
1401	EHBlocks));
1402	LPadMap.remapEHValues(VMap, UndefValue::get(Int8PtrType),
1403	ConstantInt::get(Type::getInt32Ty(Context), 1));
1404	} else {
1405	Director.reset(
1406	new WinEHCleanupDirector(Handler, ParentFP, VarInfo, LPadMap));
1407	LPadMap.remapEHValues(VMap, UndefValue::get(Int8PtrType),
1408	UndefValue::get(Type::getInt32Ty(Context)));
1409	}
1410
1411	SmallVector<ReturnInst *, 8> Returns;
1412	ClonedCodeInfo OutlinedFunctionInfo;
1413
1414	// If the start block contains PHI nodes, we need to map them.
1415	BasicBlock::iterator II = StartBB->begin();
1416	while (auto *PN = dyn_cast<PHINode>(II)) {
1417	bool Mapped = false;
1418	// Look for PHI values that we have already mapped (such as the selector).
1419	for (Value *Val : PN->incoming_values()) {
1420	if (VMap.count(Val)) {
1421	VMap[PN] = VMap[Val];
1422	Mapped = true;
1423	}
1424	}
1425	// If we didn't find a match for this value, map it as an undef.
1426	if (!Mapped) {
1427	VMap[PN] = UndefValue::get(PN->getType());
1428	}
1429	++II;
1430	}
1431
1432	// The landing pad value may be used by PHI nodes. It will ultimately be
1433	// eliminated, but we need it in the map for intermediate handling.
1434	VMap[LPad] = UndefValue::get(LPad->getType());
1435
1436	// Skip over PHIs and, if applicable, landingpad instructions.
1437	II = StartBB->getFirstInsertionPt();
1438
1439	CloneAndPruneIntoFromInst(Handler, SrcFn, II, VMap,
1440	/ModuleLevelChanges=/false, Returns, "",
1441	&OutlinedFunctionInfo, Director.get());
1442
1443	// Move all the instructions in the cloned "entry" block into our entry block.
1444	// Depending on how the parent function was laid out, the block that will
1445	// correspond to the outlined entry block may not be the first block in the
1446	// list. We can recognize it, however, as the cloned block which has no
1447	// predecessors. Any other block wouldn't have been cloned if it didn't
1448	// have a predecessor which was also cloned.
1449	Function::iterator ClonedIt = std::next(Function::iterator(Entry));
1450	while (!pred_empty(ClonedIt))
1451	++ClonedIt;
1452	BasicBlock *ClonedEntryBB = ClonedIt;
1453	assert(ClonedEntryBB)((ClonedEntryBB) ? static_cast<void> (0) : __assert_fail ("ClonedEntryBB", "/tmp/buildd/llvm-toolchain-snapshot-3.7~svn240924/lib/CodeGen/WinEHPrepare.cpp" , 1453, __PRETTY_FUNCTION__));
1454	Entry->getInstList().splice(Entry->end(), ClonedEntryBB->getInstList());
1455	ClonedEntryBB->eraseFromParent();
1456
1457	// Make sure we can identify the handler's personality later.
1458	addStubInvokeToHandlerIfNeeded(Handler);
1459
1460	if (auto *CatchAction = dyn_cast<CatchHandler>(Action)) {
1461	WinEHCatchDirector *CatchDirector =
1462	reinterpret_cast<WinEHCatchDirector *>(Director.get());
1463	CatchAction->setExceptionVar(CatchDirector->getExceptionVar());
1464	CatchAction->setReturnTargets(CatchDirector->getReturnTargets());
1465
1466	// Look for blocks that are not part of the landing pad that we just
1467	// outlined but terminate with a call to llvm.eh.endcatch and a
1468	// branch to a block that is in the handler we just outlined.
1469	// These blocks will be part of a nested landing pad that intends to
1470	// return to an address in this handler. This case is best handled
1471	// after both landing pads have been outlined, so for now we'll just
1472	// save the association of the blocks in LPadTargetBlocks. The
1473	// return instructions which are created from these branches will be
1474	// replaced after all landing pads have been outlined.
1475	for (const auto MapEntry : VMap) {
1476	// VMap maps all values and blocks that were just cloned, but dead
1477	// blocks which were pruned will map to nullptr.
1478	if (!isa<BasicBlock>(MapEntry.first) \|\| MapEntry.second == nullptr)
1479	continue;
1480	const BasicBlock *MappedBB = cast<BasicBlock>(MapEntry.first);
1481	for (auto Pred : predecessors(const_cast<BasicBlock >(MappedBB))) {
1482	auto *Branch = dyn_cast<BranchInst>(Pred->getTerminator());
1483	if (!Branch \|\| !Branch->isUnconditional() \|\| Pred->size() <= 1)
1484	continue;
1485	BasicBlock::iterator II = const_cast<BranchInst *>(Branch);
1486	--II;
1487	if (match(cast<Value>(II), m_Intrinsic<Intrinsic::eh_endcatch>())) {
1488	// This would indicate that a nested landing pad wants to return
1489	// to a block that is outlined into two different handlers.
1490	assert(!LPadTargetBlocks.count(MappedBB))((!LPadTargetBlocks.count(MappedBB)) ? static_cast<void> (0) : __assert_fail ("!LPadTargetBlocks.count(MappedBB)", "/tmp/buildd/llvm-toolchain-snapshot-3.7~svn240924/lib/CodeGen/WinEHPrepare.cpp" , 1490, __PRETTY_FUNCTION__));
1491	LPadTargetBlocks[MappedBB] = cast<BasicBlock>(MapEntry.second);
1492	}
1493	}
1494	}
1495	} // End if (CatchAction)
1496
1497	Action->setHandlerBlockOrFunc(Handler);
1498
1499	return true;
1500	}
1501
1502	/// This BB must end in a selector dispatch. All we need to do is pass the
1503	/// handler block to llvm.eh.actions and list it as a possible indirectbr
1504	/// target.
1505	void WinEHPrepare::processSEHCatchHandler(CatchHandler *CatchAction,
1506	BasicBlock *StartBB) {
1507	BasicBlock *HandlerBB;
1508	BasicBlock *NextBB;
1509	Constant *Selector;
1510	bool Res = isSelectorDispatch(StartBB, HandlerBB, Selector, NextBB);
1511	if (Res) {
1512	// If this was EH dispatch, this must be a conditional branch to the handler
1513	// block.
1514	// FIXME: Handle instructions in the dispatch block. Currently we drop them,
1515	// leading to crashes if some optimization hoists stuff here.
1516	assert(CatchAction->getSelector() && HandlerBB &&((CatchAction->getSelector() && HandlerBB && "expected catch EH dispatch") ? static_cast<void> (0) : __assert_fail ("CatchAction->getSelector() && HandlerBB && \"expected catch EH dispatch\"" , "/tmp/buildd/llvm-toolchain-snapshot-3.7~svn240924/lib/CodeGen/WinEHPrepare.cpp" , 1517, __PRETTY_FUNCTION__))
1517	"expected catch EH dispatch")((CatchAction->getSelector() && HandlerBB && "expected catch EH dispatch") ? static_cast<void> (0) : __assert_fail ("CatchAction->getSelector() && HandlerBB && \"expected catch EH dispatch\"" , "/tmp/buildd/llvm-toolchain-snapshot-3.7~svn240924/lib/CodeGen/WinEHPrepare.cpp" , 1517, __PRETTY_FUNCTION__));
1518	} else {
1519	// This must be a catch-all. Split the block after the landingpad.
1520	assert(CatchAction->getSelector()->isNullValue() && "expected catch-all")((CatchAction->getSelector()->isNullValue() && "expected catch-all" ) ? static_cast<void> (0) : __assert_fail ("CatchAction->getSelector()->isNullValue() && \"expected catch-all\"" , "/tmp/buildd/llvm-toolchain-snapshot-3.7~svn240924/lib/CodeGen/WinEHPrepare.cpp" , 1520, __PRETTY_FUNCTION__));
1521	HandlerBB = SplitBlock(StartBB, StartBB->getFirstInsertionPt(), DT);
1522	}
1523	IRBuilder<> Builder(HandlerBB->getFirstInsertionPt());
1524	Function *EHCodeFn = Intrinsic::getDeclaration(
1525	StartBB->getParent()->getParent(), Intrinsic::eh_exceptioncode);
1526	Value *Code = Builder.CreateCall(EHCodeFn, {}, "sehcode");
1527	Code = Builder.CreateIntToPtr(Code, SEHExceptionCodeSlot->getAllocatedType());
1528	Builder.CreateStore(Code, SEHExceptionCodeSlot);
1529	CatchAction->setHandlerBlockOrFunc(BlockAddress::get(HandlerBB));
1530	TinyPtrVector<BasicBlock *> Targets(HandlerBB);
1531	CatchAction->setReturnTargets(Targets);
1532	}
1533
1534	void LandingPadMap::mapLandingPad(const LandingPadInst *LPad) {
1535	// Each instance of this class should only ever be used to map a single
1536	// landing pad.
1537	assert(OriginLPad == nullptr \|\| OriginLPad == LPad)((OriginLPad == nullptr \|\| OriginLPad == LPad) ? static_cast< void> (0) : __assert_fail ("OriginLPad == nullptr \|\| OriginLPad == LPad" , "/tmp/buildd/llvm-toolchain-snapshot-3.7~svn240924/lib/CodeGen/WinEHPrepare.cpp" , 1537, __PRETTY_FUNCTION__));
1538
1539	// If the landing pad has already been mapped, there's nothing more to do.
1540	if (OriginLPad == LPad)
1541	return;
1542
1543	OriginLPad = LPad;
1544
1545	// The landingpad instruction returns an aggregate value. Typically, its
1546	// value will be passed to a pair of extract value instructions and the
1547	// results of those extracts will have been promoted to reg values before
1548	// this routine is called.
1549	for (auto *U : LPad->users()) {
1550	const ExtractValueInst *Extract = dyn_cast<ExtractValueInst>(U);
1551	if (!Extract)
1552	continue;
1553	assert(Extract->getNumIndices() == 1 &&((Extract->getNumIndices() == 1 && "Unexpected operation: extracting both landing pad values" ) ? static_cast<void> (0) : __assert_fail ("Extract->getNumIndices() == 1 && \"Unexpected operation: extracting both landing pad values\"" , "/tmp/buildd/llvm-toolchain-snapshot-3.7~svn240924/lib/CodeGen/WinEHPrepare.cpp" , 1554, __PRETTY_FUNCTION__))
1554	"Unexpected operation: extracting both landing pad values")((Extract->getNumIndices() == 1 && "Unexpected operation: extracting both landing pad values" ) ? static_cast<void> (0) : __assert_fail ("Extract->getNumIndices() == 1 && \"Unexpected operation: extracting both landing pad values\"" , "/tmp/buildd/llvm-toolchain-snapshot-3.7~svn240924/lib/CodeGen/WinEHPrepare.cpp" , 1554, __PRETTY_FUNCTION__));
1555	unsigned int Idx = *(Extract->idx_begin());
1556	assert((Idx == 0 \|\| Idx == 1) &&(((Idx == 0 \|\| Idx == 1) && "Unexpected operation: extracting an unknown landing pad element" ) ? static_cast<void> (0) : __assert_fail ("(Idx == 0 \|\| Idx == 1) && \"Unexpected operation: extracting an unknown landing pad element\"" , "/tmp/buildd/llvm-toolchain-snapshot-3.7~svn240924/lib/CodeGen/WinEHPrepare.cpp" , 1557, __PRETTY_FUNCTION__))
1557	"Unexpected operation: extracting an unknown landing pad element")(((Idx == 0 \|\| Idx == 1) && "Unexpected operation: extracting an unknown landing pad element" ) ? static_cast<void> (0) : __assert_fail ("(Idx == 0 \|\| Idx == 1) && \"Unexpected operation: extracting an unknown landing pad element\"" , "/tmp/buildd/llvm-toolchain-snapshot-3.7~svn240924/lib/CodeGen/WinEHPrepare.cpp" , 1557, __PRETTY_FUNCTION__));
1558	if (Idx == 0) {
1559	ExtractedEHPtrs.push_back(Extract);
1560	} else if (Idx == 1) {
1561	ExtractedSelectors.push_back(Extract);
1562	}
1563	}
1564	}
1565
1566	bool LandingPadMap::isOriginLandingPadBlock(const BasicBlock *BB) const {
1567	return BB->getLandingPadInst() == OriginLPad;
1568	}
1569
1570	bool LandingPadMap::isLandingPadSpecificInst(const Instruction *Inst) const {
1571	if (Inst == OriginLPad)
1572	return true;
1573	for (auto *Extract : ExtractedEHPtrs) {
1574	if (Inst == Extract)
1575	return true;
1576	}
1577	for (auto *Extract : ExtractedSelectors) {
1578	if (Inst == Extract)
1579	return true;
1580	}
1581	return false;
1582	}
1583
1584	void LandingPadMap::remapEHValues(ValueToValueMapTy &VMap, Value *EHPtrValue,
1585	Value *SelectorValue) const {
1586	// Remap all landing pad extract instructions to the specified values.
1587	for (auto *Extract : ExtractedEHPtrs)
1588	VMap[Extract] = EHPtrValue;
1589	for (auto *Extract : ExtractedSelectors)
1590	VMap[Extract] = SelectorValue;
1591	}
1592
1593	static bool isFrameAddressCall(const Value *V) {
1594	return match(const_cast<Value *>(V),
1595	m_Intrinsic<Intrinsic::frameaddress>(m_SpecificInt(0)));
1596	}
1597
1598	CloningDirector::CloningAction WinEHCloningDirectorBase::handleInstruction(
1599	ValueToValueMapTy &VMap, const Instruction Inst, BasicBlock NewBB) {
1600	// If this is one of the boilerplate landing pad instructions, skip it.
1601	// The instruction will have already been remapped in VMap.
1602	if (LPadMap.isLandingPadSpecificInst(Inst))
1603	return CloningDirector::SkipInstruction;
1604
1605	// Nested landing pads that have not already been outlined will be cloned as
1606	// stubs, with just the landingpad instruction and an unreachable instruction.
1607	// When all landingpads have been outlined, we'll replace this with the
1608	// llvm.eh.actions call and indirect branch created when the landing pad was
1609	// outlined.
1610	if (auto *LPad = dyn_cast<LandingPadInst>(Inst)) {
1611	return handleLandingPad(VMap, LPad, NewBB);
1612	}
1613
1614	// Nested landing pads that have already been outlined will be cloned in their
1615	// outlined form, but we need to intercept the ibr instruction to filter out
1616	// targets that do not return to the handler we are outlining.
1617	if (auto *IBr = dyn_cast<IndirectBrInst>(Inst)) {
1618	return handleIndirectBr(VMap, IBr, NewBB);
1619	}
1620
1621	if (auto *Invoke = dyn_cast<InvokeInst>(Inst))
1622	return handleInvoke(VMap, Invoke, NewBB);
1623
1624	if (auto *Resume = dyn_cast<ResumeInst>(Inst))
1625	return handleResume(VMap, Resume, NewBB);
1626
1627	if (auto *Cmp = dyn_cast<CmpInst>(Inst))
1628	return handleCompare(VMap, Cmp, NewBB);
1629
1630	if (match(Inst, m_Intrinsic<Intrinsic::eh_begincatch>()))
1631	return handleBeginCatch(VMap, Inst, NewBB);
1632	if (match(Inst, m_Intrinsic<Intrinsic::eh_endcatch>()))
1633	return handleEndCatch(VMap, Inst, NewBB);
1634	if (match(Inst, m_Intrinsic<Intrinsic::eh_typeid_for>()))
1635	return handleTypeIdFor(VMap, Inst, NewBB);
1636
1637	// When outlining llvm.frameaddress(i32 0), remap that to the second argument,
1638	// which is the FP of the parent.
1639	if (isFrameAddressCall(Inst)) {
1640	VMap[Inst] = ParentFP;
1641	return CloningDirector::SkipInstruction;
1642	}
1643
1644	// Continue with the default cloning behavior.
1645	return CloningDirector::CloneInstruction;
1646	}
1647
1648	CloningDirector::CloningAction WinEHCatchDirector::handleLandingPad(
1649	ValueToValueMapTy &VMap, const LandingPadInst LPad, BasicBlock NewBB) {
1650	// If the instruction after the landing pad is a call to llvm.eh.actions
1651	// the landing pad has already been outlined. In this case, we should
1652	// clone it because it may return to a block in the handler we are
1653	// outlining now that would otherwise be unreachable. The landing pads
1654	// are sorted before outlining begins to enable this case to work
1655	// properly.
1656	const Instruction *NextI = LPad->getNextNode();
1657	if (match(NextI, m_Intrinsic<Intrinsic::eh_actions>()))
1658	return CloningDirector::CloneInstruction;
1659
1660	// If the landing pad hasn't been outlined yet, the landing pad we are
1661	// outlining now does not dominate it and so it cannot return to a block
1662	// in this handler. In that case, we can just insert a stub landing
1663	// pad now and patch it up later.
1664	Instruction *NewInst = LPad->clone();
1665	if (LPad->hasName())
1666	NewInst->setName(LPad->getName());
1667	// Save this correlation for later processing.
1668	NestedLPtoOriginalLP[cast<LandingPadInst>(NewInst)] = LPad;
1669	VMap[LPad] = NewInst;
1670	BasicBlock::InstListType &InstList = NewBB->getInstList();
1671	InstList.push_back(NewInst);
1672	InstList.push_back(new UnreachableInst(NewBB->getContext()));
1673	return CloningDirector::StopCloningBB;
1674	}
1675
1676	CloningDirector::CloningAction WinEHCatchDirector::handleBeginCatch(
1677	ValueToValueMapTy &VMap, const Instruction Inst, BasicBlock NewBB) {
1678	// The argument to the call is some form of the first element of the
1679	// landingpad aggregate value, but that doesn't matter. It isn't used
1680	// here.
1681	// The second argument is an outparameter where the exception object will be
1682	// stored. Typically the exception object is a scalar, but it can be an
1683	// aggregate when catching by value.
1684	// FIXME: Leave something behind to indicate where the exception object lives
1685	// for this handler. Should it be part of llvm.eh.actions?
1686	assert(ExceptionObjectVar == nullptr && "Multiple calls to "((ExceptionObjectVar == nullptr && "Multiple calls to " "llvm.eh.begincatch found while " "outlining catch handler." ) ? static_cast<void> (0) : __assert_fail ("ExceptionObjectVar == nullptr && \"Multiple calls to \" \"llvm.eh.begincatch found while \" \"outlining catch handler.\"" , "/tmp/buildd/llvm-toolchain-snapshot-3.7~svn240924/lib/CodeGen/WinEHPrepare.cpp" , 1688, __PRETTY_FUNCTION__))
1687	"llvm.eh.begincatch found while "((ExceptionObjectVar == nullptr && "Multiple calls to " "llvm.eh.begincatch found while " "outlining catch handler." ) ? static_cast<void> (0) : __assert_fail ("ExceptionObjectVar == nullptr && \"Multiple calls to \" \"llvm.eh.begincatch found while \" \"outlining catch handler.\"" , "/tmp/buildd/llvm-toolchain-snapshot-3.7~svn240924/lib/CodeGen/WinEHPrepare.cpp" , 1688, __PRETTY_FUNCTION__))
1688	"outlining catch handler.")((ExceptionObjectVar == nullptr && "Multiple calls to " "llvm.eh.begincatch found while " "outlining catch handler." ) ? static_cast<void> (0) : __assert_fail ("ExceptionObjectVar == nullptr && \"Multiple calls to \" \"llvm.eh.begincatch found while \" \"outlining catch handler.\"" , "/tmp/buildd/llvm-toolchain-snapshot-3.7~svn240924/lib/CodeGen/WinEHPrepare.cpp" , 1688, __PRETTY_FUNCTION__));
1689	ExceptionObjectVar = Inst->getOperand(1)->stripPointerCasts();
1690	if (isa<ConstantPointerNull>(ExceptionObjectVar))
1691	return CloningDirector::SkipInstruction;
1692	assert(cast<AllocaInst>(ExceptionObjectVar)->isStaticAlloca() &&((cast<AllocaInst>(ExceptionObjectVar)->isStaticAlloca () && "catch parameter is not static alloca") ? static_cast <void> (0) : __assert_fail ("cast<AllocaInst>(ExceptionObjectVar)->isStaticAlloca() && \"catch parameter is not static alloca\"" , "/tmp/buildd/llvm-toolchain-snapshot-3.7~svn240924/lib/CodeGen/WinEHPrepare.cpp" , 1693, __PRETTY_FUNCTION__))
1693	"catch parameter is not static alloca")((cast<AllocaInst>(ExceptionObjectVar)->isStaticAlloca () && "catch parameter is not static alloca") ? static_cast <void> (0) : __assert_fail ("cast<AllocaInst>(ExceptionObjectVar)->isStaticAlloca() && \"catch parameter is not static alloca\"" , "/tmp/buildd/llvm-toolchain-snapshot-3.7~svn240924/lib/CodeGen/WinEHPrepare.cpp" , 1693, __PRETTY_FUNCTION__));
1694	Materializer.escapeCatchObject(ExceptionObjectVar);
1695	return CloningDirector::SkipInstruction;
1696	}
1697
1698	CloningDirector::CloningAction
1699	WinEHCatchDirector::handleEndCatch(ValueToValueMapTy &VMap,
1700	const Instruction Inst, BasicBlock NewBB) {
1701	auto *IntrinCall = dyn_cast<IntrinsicInst>(Inst);
1702	// It might be interesting to track whether or not we are inside a catch
1703	// function, but that might make the algorithm more brittle than it needs
1704	// to be.
1705
1706	// The end catch call can occur in one of two places: either in a
1707	// landingpad block that is part of the catch handlers exception mechanism,
1708	// or at the end of the catch block. However, a catch-all handler may call
1709	// end catch from the original landing pad. If the call occurs in a nested
1710	// landing pad block, we must skip it and continue so that the landing pad
1711	// gets cloned.
1712	auto *ParentBB = IntrinCall->getParent();
1713	if (ParentBB->isLandingPad() && !LPadMap.isOriginLandingPadBlock(ParentBB))
1714	return CloningDirector::SkipInstruction;
1715
1716	// If an end catch occurs anywhere else we want to terminate the handler
1717	// with a return to the code that follows the endcatch call. If the
1718	// next instruction is not an unconditional branch, we need to split the
1719	// block to provide a clear target for the return instruction.
1720	BasicBlock *ContinueBB;
1721	auto Next = std::next(BasicBlock::const_iterator(IntrinCall));
1722	const BranchInst *Branch = dyn_cast<BranchInst>(Next);
1723	if (!Branch \|\| !Branch->isUnconditional()) {
1724	// We're interrupting the cloning process at this location, so the
1725	// const_cast we're doing here will not cause a problem.
1726	ContinueBB = SplitBlock(const_cast<BasicBlock *>(ParentBB),
1727	const_cast<Instruction *>(cast<Instruction>(Next)));
1728	} else {
1729	ContinueBB = Branch->getSuccessor(0);
1730	}
1731
1732	ReturnInst::Create(NewBB->getContext(), BlockAddress::get(ContinueBB), NewBB);
1733	ReturnTargets.push_back(ContinueBB);
1734
1735	// We just added a terminator to the cloned block.
1736	// Tell the caller to stop processing the current basic block so that
1737	// the branch instruction will be skipped.
1738	return CloningDirector::StopCloningBB;
1739	}
1740
1741	CloningDirector::CloningAction WinEHCatchDirector::handleTypeIdFor(
1742	ValueToValueMapTy &VMap, const Instruction Inst, BasicBlock NewBB) {
1743	auto *IntrinCall = dyn_cast<IntrinsicInst>(Inst);
1744	Value *Selector = IntrinCall->getArgOperand(0)->stripPointerCasts();
1745	// This causes a replacement that will collapse the landing pad CFG based
1746	// on the filter function we intend to match.
1747	if (Selector == CurrentSelector)
1748	VMap[Inst] = ConstantInt::get(SelectorIDType, 1);
1749	else
1750	VMap[Inst] = ConstantInt::get(SelectorIDType, 0);
1751	// Tell the caller not to clone this instruction.
1752	return CloningDirector::SkipInstruction;
1753	}
1754
1755	CloningDirector::CloningAction WinEHCatchDirector::handleIndirectBr(
1756	ValueToValueMapTy &VMap,
1757	const IndirectBrInst *IBr,
1758	BasicBlock *NewBB) {
1759	// If this indirect branch is not part of a landing pad block, just clone it.
1760	const BasicBlock *ParentBB = IBr->getParent();
1761	if (!ParentBB->isLandingPad())
1762	return CloningDirector::CloneInstruction;
1763
1764	// If it is part of a landing pad, we want to filter out target blocks
1765	// that are not part of the handler we are outlining.
1766	const LandingPadInst *LPad = ParentBB->getLandingPadInst();
1767
1768	// Save this correlation for later processing.
1769	NestedLPtoOriginalLP[cast<LandingPadInst>(VMap[LPad])] = LPad;
1770
1771	// We should only get here for landing pads that have already been outlined.
1772	assert(match(LPad->getNextNode(), m_Intrinsic<Intrinsic::eh_actions>()))((match(LPad->getNextNode(), m_Intrinsic<Intrinsic::eh_actions >())) ? static_cast<void> (0) : __assert_fail ("match(LPad->getNextNode(), m_Intrinsic<Intrinsic::eh_actions>())" , "/tmp/buildd/llvm-toolchain-snapshot-3.7~svn240924/lib/CodeGen/WinEHPrepare.cpp" , 1772, __PRETTY_FUNCTION__));
1773
1774	// Copy the indirectbr, but only include targets that were previously
1775	// identified as EH blocks and are dominated by the nested landing pad.
1776	SetVector<const BasicBlock *> ReturnTargets;
1777	for (int I = 0, E = IBr->getNumDestinations(); I < E; ++I) {
1778	auto *TargetBB = IBr->getDestination(I);
1779	if (EHBlocks.count(const_cast<BasicBlock*>(TargetBB)) &&
1780	DT->dominates(ParentBB, TargetBB)) {
1781	DEBUG(dbgs() << " Adding destination " << TargetBB->getName() << "\n")do { if (::llvm::DebugFlag && ::llvm::isCurrentDebugType ("winehprepare")) { dbgs() << " Adding destination " << TargetBB->getName() << "\n"; } } while (0);
1782	ReturnTargets.insert(TargetBB);
1783	}
1784	}
1785	IndirectBrInst *NewBranch =
1786	IndirectBrInst::Create(const_cast<Value *>(IBr->getAddress()),
1787	ReturnTargets.size(), NewBB);
1788	for (auto *Target : ReturnTargets)
1789	NewBranch->addDestination(const_cast<BasicBlock*>(Target));
1790
1791	// The operands and targets of the branch instruction are remapped later
1792	// because it is a terminator. Tell the cloning code to clone the
1793	// blocks we just added to the target list.
1794	return CloningDirector::CloneSuccessors;
1795	}
1796
1797	CloningDirector::CloningAction
1798	WinEHCatchDirector::handleInvoke(ValueToValueMapTy &VMap,
1799	const InvokeInst Invoke, BasicBlock NewBB) {
1800	return CloningDirector::CloneInstruction;
1801	}
1802
1803	CloningDirector::CloningAction
1804	WinEHCatchDirector::handleResume(ValueToValueMapTy &VMap,
1805	const ResumeInst Resume, BasicBlock NewBB) {
1806	// Resume instructions shouldn't be reachable from catch handlers.
1807	// We still need to handle it, but it will be pruned.
1808	BasicBlock::InstListType &InstList = NewBB->getInstList();
1809	InstList.push_back(new UnreachableInst(NewBB->getContext()));
1810	return CloningDirector::StopCloningBB;
1811	}
1812
1813	CloningDirector::CloningAction
1814	WinEHCatchDirector::handleCompare(ValueToValueMapTy &VMap,
1815	const CmpInst Compare, BasicBlock NewBB) {
1816	const IntrinsicInst *IntrinCall = nullptr;
1817	if (match(Compare->getOperand(0), m_Intrinsic<Intrinsic::eh_typeid_for>())) {
1818	IntrinCall = dyn_cast<IntrinsicInst>(Compare->getOperand(0));
1819	} else if (match(Compare->getOperand(1),
1820	m_Intrinsic<Intrinsic::eh_typeid_for>())) {
1821	IntrinCall = dyn_cast<IntrinsicInst>(Compare->getOperand(1));
1822	}
1823	if (IntrinCall) {
1824	Value *Selector = IntrinCall->getArgOperand(0)->stripPointerCasts();
1825	// This causes a replacement that will collapse the landing pad CFG based
1826	// on the filter function we intend to match.
1827	if (Selector == CurrentSelector->stripPointerCasts()) {
1828	VMap[Compare] = ConstantInt::get(SelectorIDType, 1);
1829	} else {
1830	VMap[Compare] = ConstantInt::get(SelectorIDType, 0);
1831	}
1832	return CloningDirector::SkipInstruction;
1833	}
1834	return CloningDirector::CloneInstruction;
1835	}
1836
1837	CloningDirector::CloningAction WinEHCleanupDirector::handleLandingPad(
1838	ValueToValueMapTy &VMap, const LandingPadInst LPad, BasicBlock NewBB) {
1839	// The MS runtime will terminate the process if an exception occurs in a
1840	// cleanup handler, so we shouldn't encounter landing pads in the actual
1841	// cleanup code, but they may appear in catch blocks. Depending on where
1842	// we started cloning we may see one, but it will get dropped during dead
1843	// block pruning.
1844	Instruction *NewInst = new UnreachableInst(NewBB->getContext());
1845	VMap[LPad] = NewInst;
1846	BasicBlock::InstListType &InstList = NewBB->getInstList();
1847	InstList.push_back(NewInst);
1848	return CloningDirector::StopCloningBB;
1849	}
1850
1851	CloningDirector::CloningAction WinEHCleanupDirector::handleBeginCatch(
1852	ValueToValueMapTy &VMap, const Instruction Inst, BasicBlock NewBB) {
1853	// Cleanup code may flow into catch blocks or the catch block may be part
1854	// of a branch that will be optimized away. We'll insert a return
1855	// instruction now, but it may be pruned before the cloning process is
1856	// complete.
1857	ReturnInst::Create(NewBB->getContext(), nullptr, NewBB);
1858	return CloningDirector::StopCloningBB;
1859	}
1860
1861	CloningDirector::CloningAction WinEHCleanupDirector::handleEndCatch(
1862	ValueToValueMapTy &VMap, const Instruction Inst, BasicBlock NewBB) {
1863	// Cleanup handlers nested within catch handlers may begin with a call to
1864	// eh.endcatch. We can just ignore that instruction.
1865	return CloningDirector::SkipInstruction;
1866	}
1867
1868	CloningDirector::CloningAction WinEHCleanupDirector::handleTypeIdFor(
1869	ValueToValueMapTy &VMap, const Instruction Inst, BasicBlock NewBB) {
1870	// If we encounter a selector comparison while cloning a cleanup handler,
1871	// we want to stop cloning immediately. Anything after the dispatch
1872	// will be outlined into a different handler.
1873	BasicBlock *CatchHandler;
1874	Constant *Selector;
1875	BasicBlock *NextBB;
1876	if (isSelectorDispatch(const_cast<BasicBlock *>(Inst->getParent()),
1877	CatchHandler, Selector, NextBB)) {
1878	ReturnInst::Create(NewBB->getContext(), nullptr, NewBB);
1879	return CloningDirector::StopCloningBB;
1880	}
1881	// If eg.typeid.for is called for any other reason, it can be ignored.
1882	VMap[Inst] = ConstantInt::get(SelectorIDType, 0);
1883	return CloningDirector::SkipInstruction;
1884	}
1885
1886	CloningDirector::CloningAction WinEHCleanupDirector::handleIndirectBr(
1887	ValueToValueMapTy &VMap,
1888	const IndirectBrInst *IBr,
1889	BasicBlock *NewBB) {
1890	// No special handling is required for cleanup cloning.
1891	return CloningDirector::CloneInstruction;
1892	}
1893
1894	CloningDirector::CloningAction WinEHCleanupDirector::handleInvoke(
1895	ValueToValueMapTy &VMap, const InvokeInst Invoke, BasicBlock NewBB) {
1896	// All invokes in cleanup handlers can be replaced with calls.
1897	SmallVector<Value *, 16> CallArgs(Invoke->op_begin(), Invoke->op_end() - 3);
1898	// Insert a normal call instruction...
1899	CallInst *NewCall =
1900	CallInst::Create(const_cast<Value *>(Invoke->getCalledValue()), CallArgs,
1901	Invoke->getName(), NewBB);
1902	NewCall->setCallingConv(Invoke->getCallingConv());
1903	NewCall->setAttributes(Invoke->getAttributes());
1904	NewCall->setDebugLoc(Invoke->getDebugLoc());
1905	VMap[Invoke] = NewCall;
1906
1907	// Remap the operands.
1908	llvm::RemapInstruction(NewCall, VMap, RF_None, nullptr, &Materializer);
1909
1910	// Insert an unconditional branch to the normal destination.
1911	BranchInst::Create(Invoke->getNormalDest(), NewBB);
1912
1913	// The unwind destination won't be cloned into the new function, so
1914	// we don't need to clean up its phi nodes.
1915
1916	// We just added a terminator to the cloned block.
1917	// Tell the caller to stop processing the current basic block.
1918	return CloningDirector::CloneSuccessors;
1919	}
1920
1921	CloningDirector::CloningAction WinEHCleanupDirector::handleResume(
1922	ValueToValueMapTy &VMap, const ResumeInst Resume, BasicBlock NewBB) {
1923	ReturnInst::Create(NewBB->getContext(), nullptr, NewBB);
1924
1925	// We just added a terminator to the cloned block.
1926	// Tell the caller to stop processing the current basic block so that
1927	// the branch instruction will be skipped.
1928	return CloningDirector::StopCloningBB;
1929	}
1930
1931	CloningDirector::CloningAction
1932	WinEHCleanupDirector::handleCompare(ValueToValueMapTy &VMap,
1933	const CmpInst Compare, BasicBlock NewBB) {
1934	if (match(Compare->getOperand(0), m_Intrinsic<Intrinsic::eh_typeid_for>()) \|\|
1935	match(Compare->getOperand(1), m_Intrinsic<Intrinsic::eh_typeid_for>())) {
1936	VMap[Compare] = ConstantInt::get(SelectorIDType, 1);
1937	return CloningDirector::SkipInstruction;
1938	}
1939	return CloningDirector::CloneInstruction;
1940	}
1941
1942	WinEHFrameVariableMaterializer::WinEHFrameVariableMaterializer(
1943	Function OutlinedFn, Value ParentFP, FrameVarInfoMap &FrameVarInfo)
1944	: FrameVarInfo(FrameVarInfo), Builder(OutlinedFn->getContext()) {
1945	BasicBlock *EntryBB = &OutlinedFn->getEntryBlock();
1946
1947	// New allocas should be inserted in the entry block, but after the parent FP
1948	// is established if it is an instruction.
1949	Instruction *InsertPoint = EntryBB->getFirstInsertionPt();
1950	if (auto *FPInst = dyn_cast<Instruction>(ParentFP))
1951	InsertPoint = FPInst->getNextNode();
1952	Builder.SetInsertPoint(EntryBB, InsertPoint);
1953	}
1954
1955	Value WinEHFrameVariableMaterializer::materializeValueFor(Value V) {
1956	// If we're asked to materialize a static alloca, we temporarily create an
1957	// alloca in the outlined function and add this to the FrameVarInfo map. When
1958	// all the outlining is complete, we'll replace these temporary allocas with
1959	// calls to llvm.framerecover.
1960	if (auto *AV = dyn_cast<AllocaInst>(V)) {
1961	assert(AV->isStaticAlloca() &&((AV->isStaticAlloca() && "cannot materialize un-demoted dynamic alloca" ) ? static_cast<void> (0) : __assert_fail ("AV->isStaticAlloca() && \"cannot materialize un-demoted dynamic alloca\"" , "/tmp/buildd/llvm-toolchain-snapshot-3.7~svn240924/lib/CodeGen/WinEHPrepare.cpp" , 1962, __PRETTY_FUNCTION__))
1962	"cannot materialize un-demoted dynamic alloca")((AV->isStaticAlloca() && "cannot materialize un-demoted dynamic alloca" ) ? static_cast<void> (0) : __assert_fail ("AV->isStaticAlloca() && \"cannot materialize un-demoted dynamic alloca\"" , "/tmp/buildd/llvm-toolchain-snapshot-3.7~svn240924/lib/CodeGen/WinEHPrepare.cpp" , 1962, __PRETTY_FUNCTION__));
1963	AllocaInst *NewAlloca = dyn_cast<AllocaInst>(AV->clone());
1964	Builder.Insert(NewAlloca, AV->getName());
1965	FrameVarInfo[AV].push_back(NewAlloca);
1966	return NewAlloca;
1967	}
1968
1969	if (isa<Instruction>(V) \|\| isa<Argument>(V)) {
1970	Function *Parent = isa<Instruction>(V)
1971	? cast<Instruction>(V)->getParent()->getParent()
1972	: cast<Argument>(V)->getParent();
1973	errs()
1974	<< "Failed to demote instruction used in exception handler of function "
1975	<< GlobalValue::getRealLinkageName(Parent->getName()) << ":\n";
1976	errs() << " " << *V << '\n';
1977	report_fatal_error("WinEHPrepare failed to demote instruction");
1978	}
1979
1980	// Don't materialize other values.
1981	return nullptr;
1982	}
1983
1984	void WinEHFrameVariableMaterializer::escapeCatchObject(Value *V) {
1985	// Catch parameter objects have to live in the parent frame. When we see a use
1986	// of a catch parameter, add a sentinel to the multimap to indicate that it's
1987	// used from another handler. This will prevent us from trying to sink the
1988	// alloca into the handler and ensure that the catch parameter is present in
1989	// the call to llvm.frameescape.
1990	FrameVarInfo[V].push_back(getCatchObjectSentinel());
1991	}
1992
1993	// This function maps the catch and cleanup handlers that are reachable from the
1994	// specified landing pad. The landing pad sequence will have this basic shape:
1995	//
1996	// <cleanup handler>
1997	// <selector comparison>
1998	// <catch handler>
1999	// <cleanup handler>
2000	// <selector comparison>
2001	// <catch handler>
2002	// <cleanup handler>
2003	// ...
2004	//
2005	// Any of the cleanup slots may be absent. The cleanup slots may be occupied by
2006	// any arbitrary control flow, but all paths through the cleanup code must
2007	// eventually reach the next selector comparison and no path can skip to a
2008	// different selector comparisons, though some paths may terminate abnormally.
2009	// Therefore, we will use a depth first search from the start of any given
2010	// cleanup block and stop searching when we find the next selector comparison.
2011	//
2012	// If the landingpad instruction does not have a catch clause, we will assume
2013	// that any instructions other than selector comparisons and catch handlers can
2014	// be ignored. In practice, these will only be the boilerplate instructions.
2015	//
2016	// The catch handlers may also have any control structure, but we are only
2017	// interested in the start of the catch handlers, so we don't need to actually
2018	// follow the flow of the catch handlers. The start of the catch handlers can
2019	// be located from the compare instructions, but they can be skipped in the
2020	// flow by following the contrary branch.
2021	void WinEHPrepare::mapLandingPadBlocks(LandingPadInst *LPad,
2022	LandingPadActions &Actions) {
2023	unsigned int NumClauses = LPad->getNumClauses();
2024	unsigned int HandlersFound = 0;
2025	BasicBlock *BB = LPad->getParent();
2026
2027	DEBUG(dbgs() << "Mapping landing pad: " << BB->getName() << "\n")do { if (::llvm::DebugFlag && ::llvm::isCurrentDebugType ("winehprepare")) { dbgs() << "Mapping landing pad: " << BB->getName() << "\n"; } } while (0);
2028
2029	if (NumClauses == 0) {
2030	findCleanupHandlers(Actions, BB, nullptr);
2031	return;
2032	}
2033
2034	VisitedBlockSet VisitedBlocks;
2035
2036	while (HandlersFound != NumClauses) {
2037	BasicBlock *NextBB = nullptr;
2038
2039	// Skip over filter clauses.
2040	if (LPad->isFilter(HandlersFound)) {
2041	++HandlersFound;
2042	continue;
2043	}
2044
2045	// See if the clause we're looking for is a catch-all.
2046	// If so, the catch begins immediately.
2047	Constant *ExpectedSelector =
2048	LPad->getClause(HandlersFound)->stripPointerCasts();
2049	if (isa<ConstantPointerNull>(ExpectedSelector)) {
2050	// The catch all must occur last.
2051	assert(HandlersFound == NumClauses - 1)((HandlersFound == NumClauses - 1) ? static_cast<void> ( 0) : __assert_fail ("HandlersFound == NumClauses - 1", "/tmp/buildd/llvm-toolchain-snapshot-3.7~svn240924/lib/CodeGen/WinEHPrepare.cpp" , 2051, __PRETTY_FUNCTION__));
2052
2053	// There can be additional selector dispatches in the call chain that we
2054	// need to ignore.
2055	BasicBlock *CatchBlock = nullptr;
2056	Constant *Selector;
2057	while (BB && isSelectorDispatch(BB, CatchBlock, Selector, NextBB)) {
2058	DEBUG(dbgs() << " Found extra catch dispatch in block "do { if (::llvm::DebugFlag && ::llvm::isCurrentDebugType ("winehprepare")) { dbgs() << " Found extra catch dispatch in block " << CatchBlock->getName() << "\n"; } } while ( 0)
2059	<< CatchBlock->getName() << "\n")do { if (::llvm::DebugFlag && ::llvm::isCurrentDebugType ("winehprepare")) { dbgs() << " Found extra catch dispatch in block " << CatchBlock->getName() << "\n"; } } while ( 0);
2060	BB = NextBB;
2061	}
2062
2063	// Add the catch handler to the action list.
2064	CatchHandler *Action = nullptr;
2065	if (CatchHandlerMap.count(BB) && CatchHandlerMap[BB] != nullptr) {
2066	// If the CatchHandlerMap already has an entry for this BB, re-use it.
2067	Action = CatchHandlerMap[BB];
2068	assert(Action->getSelector() == ExpectedSelector)((Action->getSelector() == ExpectedSelector) ? static_cast <void> (0) : __assert_fail ("Action->getSelector() == ExpectedSelector" , "/tmp/buildd/llvm-toolchain-snapshot-3.7~svn240924/lib/CodeGen/WinEHPrepare.cpp" , 2068, __PRETTY_FUNCTION__));
2069	} else {
2070	// We don't expect a selector dispatch, but there may be a call to
2071	// llvm.eh.begincatch, which separates catch handling code from
2072	// cleanup code in the same control flow. This call looks for the
2073	// begincatch intrinsic.
2074	Action = findCatchHandler(BB, NextBB, VisitedBlocks);
2075	if (Action) {
2076	// For C++ EH, check if there is any interesting cleanup code before
2077	// we begin the catch. This is important because cleanups cannot
2078	// rethrow exceptions but code called from catches can. For SEH, it
2079	// isn't important if some finally code before a catch-all is executed
2080	// out of line or after recovering from the exception.
2081	if (Personality == EHPersonality::MSVC_CXX)
2082	findCleanupHandlers(Actions, BB, BB);
2083	} else {
2084	// If an action was not found, it means that the control flows
2085	// directly into the catch-all handler and there is no cleanup code.
2086	// That's an expected situation and we must create a catch action.
2087	// Since this is a catch-all handler, the selector won't actually
2088	// appear in the code anywhere. ExpectedSelector here is the constant
2089	// null ptr that we got from the landing pad instruction.
2090	Action = new CatchHandler(BB, ExpectedSelector, nullptr);
2091	CatchHandlerMap[BB] = Action;
2092	}
2093	}
2094	Actions.insertCatchHandler(Action);
2095	DEBUG(dbgs() << " Catch all handler at block " << BB->getName() << "\n")do { if (::llvm::DebugFlag && ::llvm::isCurrentDebugType ("winehprepare")) { dbgs() << " Catch all handler at block " << BB->getName() << "\n"; } } while (0);
2096	++HandlersFound;
2097
2098	// Once we reach a catch-all, don't expect to hit a resume instruction.
2099	BB = nullptr;
2100	break;
2101	}
2102
2103	CatchHandler *CatchAction = findCatchHandler(BB, NextBB, VisitedBlocks);
2104	assert(CatchAction)((CatchAction) ? static_cast<void> (0) : __assert_fail ( "CatchAction", "/tmp/buildd/llvm-toolchain-snapshot-3.7~svn240924/lib/CodeGen/WinEHPrepare.cpp" , 2104, __PRETTY_FUNCTION__));
2105
2106	// See if there is any interesting code executed before the dispatch.
2107	findCleanupHandlers(Actions, BB, CatchAction->getStartBlock());
2108
2109	// When the source program contains multiple nested try blocks the catch
2110	// handlers can get strung together in such a way that we can encounter
2111	// a dispatch for a selector that we've already had a handler for.
2112	if (CatchAction->getSelector()->stripPointerCasts() == ExpectedSelector) {
2113	++HandlersFound;
2114
2115	// Add the catch handler to the action list.
2116	DEBUG(dbgs() << " Found catch dispatch in block "do { if (::llvm::DebugFlag && ::llvm::isCurrentDebugType ("winehprepare")) { dbgs() << " Found catch dispatch in block " << CatchAction->getStartBlock()->getName() << "\n"; } } while (0)
2117	<< CatchAction->getStartBlock()->getName() << "\n")do { if (::llvm::DebugFlag && ::llvm::isCurrentDebugType ("winehprepare")) { dbgs() << " Found catch dispatch in block " << CatchAction->getStartBlock()->getName() << "\n"; } } while (0);
2118	Actions.insertCatchHandler(CatchAction);
2119	} else {
2120	// Under some circumstances optimized IR will flow unconditionally into a
2121	// handler block without checking the selector. This can only happen if
2122	// the landing pad has a catch-all handler and the handler for the
2123	// preceeding catch clause is identical to the catch-call handler
2124	// (typically an empty catch). In this case, the handler must be shared
2125	// by all remaining clauses.
2126	if (isa<ConstantPointerNull>(
2127	CatchAction->getSelector()->stripPointerCasts())) {
2128	DEBUG(dbgs() << " Applying early catch-all handler in block "do { if (::llvm::DebugFlag && ::llvm::isCurrentDebugType ("winehprepare")) { dbgs() << " Applying early catch-all handler in block " << CatchAction->getStartBlock()->getName() << " to all remaining clauses.\n"; } } while (0)
2129	<< CatchAction->getStartBlock()->getName()do { if (::llvm::DebugFlag && ::llvm::isCurrentDebugType ("winehprepare")) { dbgs() << " Applying early catch-all handler in block " << CatchAction->getStartBlock()->getName() << " to all remaining clauses.\n"; } } while (0)
2130	<< " to all remaining clauses.\n")do { if (::llvm::DebugFlag && ::llvm::isCurrentDebugType ("winehprepare")) { dbgs() << " Applying early catch-all handler in block " << CatchAction->getStartBlock()->getName() << " to all remaining clauses.\n"; } } while (0);
2131	Actions.insertCatchHandler(CatchAction);
2132	return;
2133	}
2134
2135	DEBUG(dbgs() << " Found extra catch dispatch in block "do { if (::llvm::DebugFlag && ::llvm::isCurrentDebugType ("winehprepare")) { dbgs() << " Found extra catch dispatch in block " << CatchAction->getStartBlock()->getName() << "\n"; } } while (0)
2136	<< CatchAction->getStartBlock()->getName() << "\n")do { if (::llvm::DebugFlag && ::llvm::isCurrentDebugType ("winehprepare")) { dbgs() << " Found extra catch dispatch in block " << CatchAction->getStartBlock()->getName() << "\n"; } } while (0);
2137	}
2138
2139	// Move on to the block after the catch handler.
2140	BB = NextBB;
2141	}
2142
2143	// If we didn't wind up in a catch-all, see if there is any interesting code
2144	// executed before the resume.
2145	findCleanupHandlers(Actions, BB, BB);
2146
2147	// It's possible that some optimization moved code into a landingpad that
2148	// wasn't
2149	// previously being used for cleanup. If that happens, we need to execute
2150	// that
2151	// extra code from a cleanup handler.
2152	if (Actions.includesCleanup() && !LPad->isCleanup())
2153	LPad->setCleanup(true);
2154	}
2155
2156	// This function searches starting with the input block for the next
2157	// block that terminates with a branch whose condition is based on a selector
2158	// comparison. This may be the input block. See the mapLandingPadBlocks
2159	// comments for a discussion of control flow assumptions.
2160	//
2161	CatchHandler WinEHPrepare::findCatchHandler(BasicBlock BB,
2162	BasicBlock *&NextBB,
2163	VisitedBlockSet &VisitedBlocks) {
2164	// See if we've already found a catch handler use it.
2165	// Call count() first to avoid creating a null entry for blocks
2166	// we haven't seen before.
2167	if (CatchHandlerMap.count(BB) && CatchHandlerMap[BB] != nullptr) {
2168	CatchHandler *Action = cast<CatchHandler>(CatchHandlerMap[BB]);
2169	NextBB = Action->getNextBB();
2170	return Action;
2171	}
2172
2173	// VisitedBlocks applies only to the current search. We still
2174	// need to consider blocks that we've visited while mapping other
2175	// landing pads.
2176	VisitedBlocks.insert(BB);
2177
2178	BasicBlock *CatchBlock = nullptr;
2179	Constant *Selector = nullptr;
2180
2181	// If this is the first time we've visited this block from any landing pad
2182	// look to see if it is a selector dispatch block.
2183	if (!CatchHandlerMap.count(BB)) {
2184	if (isSelectorDispatch(BB, CatchBlock, Selector, NextBB)) {
2185	CatchHandler *Action = new CatchHandler(BB, Selector, NextBB);
2186	CatchHandlerMap[BB] = Action;
2187	return Action;
2188	}
2189	// If we encounter a block containing an llvm.eh.begincatch before we
2190	// find a selector dispatch block, the handler is assumed to be
2191	// reached unconditionally. This happens for catch-all blocks, but
2192	// it can also happen for other catch handlers that have been combined
2193	// with the catch-all handler during optimization.
2194	if (isCatchBlock(BB)) {
2195	PointerType *Int8PtrTy = Type::getInt8PtrTy(BB->getContext());
2196	Constant *NullSelector = ConstantPointerNull::get(Int8PtrTy);
2197	CatchHandler *Action = new CatchHandler(BB, NullSelector, nullptr);
2198	CatchHandlerMap[BB] = Action;
2199	return Action;
2200	}
2201	}
2202
2203	// Visit each successor, looking for the dispatch.
2204	// FIXME: We expect to find the dispatch quickly, so this will probably
2205	// work better as a breadth first search.
2206	for (BasicBlock *Succ : successors(BB)) {
2207	if (VisitedBlocks.count(Succ))
2208	continue;
2209
2210	CatchHandler *Action = findCatchHandler(Succ, NextBB, VisitedBlocks);
2211	if (Action)
2212	return Action;
2213	}
2214	return nullptr;
2215	}
2216
2217	// These are helper functions to combine repeated code from findCleanupHandlers.
2218	static void createCleanupHandler(LandingPadActions &Actions,
2219	CleanupHandlerMapTy &CleanupHandlerMap,
2220	BasicBlock *BB) {
2221	CleanupHandler *Action = new CleanupHandler(BB);
2222	CleanupHandlerMap[BB] = Action;
2223	Actions.insertCleanupHandler(Action);
2224	DEBUG(dbgs() << " Found cleanup code in block "do { if (::llvm::DebugFlag && ::llvm::isCurrentDebugType ("winehprepare")) { dbgs() << " Found cleanup code in block " << Action->getStartBlock()->getName() << "\n" ; } } while (0)
2225	<< Action->getStartBlock()->getName() << "\n")do { if (::llvm::DebugFlag && ::llvm::isCurrentDebugType ("winehprepare")) { dbgs() << " Found cleanup code in block " << Action->getStartBlock()->getName() << "\n" ; } } while (0);
2226	}
2227
2228	static CallSite matchOutlinedFinallyCall(BasicBlock *BB,
2229	Instruction *MaybeCall) {
2230	// Look for finally blocks that Clang has already outlined for us.
2231	// %fp = call i8* @llvm.frameaddress(i32 0)
2232	// call void @"fin$parent"(iN 1, i8* %fp)
2233	if (isFrameAddressCall(MaybeCall) && MaybeCall != BB->getTerminator())
2234	MaybeCall = MaybeCall->getNextNode();
2235	CallSite FinallyCall(MaybeCall);
2236	if (!FinallyCall \|\| FinallyCall.arg_size() != 2)
2237	return CallSite();
2238	if (!match(FinallyCall.getArgument(0), m_SpecificInt(1)))
2239	return CallSite();
2240	if (!isFrameAddressCall(FinallyCall.getArgument(1)))
2241	return CallSite();
2242	return FinallyCall;
2243	}
2244
2245	static BasicBlock followSingleUnconditionalBranches(BasicBlock BB) {
2246	// Skip single ubr blocks.
2247	while (BB->getFirstNonPHIOrDbg() == BB->getTerminator()) {
2248	auto *Br = dyn_cast<BranchInst>(BB->getTerminator());
2249	if (Br && Br->isUnconditional())
2250	BB = Br->getSuccessor(0);
2251	else
2252	return BB;
2253	}
2254	return BB;
2255	}
2256
2257	// This function searches starting with the input block for the next block that
2258	// contains code that is not part of a catch handler and would not be eliminated
2259	// during handler outlining.
2260	//
2261	void WinEHPrepare::findCleanupHandlers(LandingPadActions &Actions,
2262	BasicBlock StartBB, BasicBlock EndBB) {
2263	// Here we will skip over the following:
2264	//
2265	// landing pad prolog:
2266	//
2267	// Unconditional branches
2268	//
2269	// Selector dispatch
2270	//
2271	// Resume pattern
2272	//
2273	// Anything else marks the start of an interesting block
2274
2275	BasicBlock *BB = StartBB;
2276	// Anything other than an unconditional branch will kick us out of this loop
2277	// one way or another.
2278	while (BB) {
2279	BB = followSingleUnconditionalBranches(BB);
2280	// If we've already scanned this block, don't scan it again. If it is
2281	// a cleanup block, there will be an action in the CleanupHandlerMap.
2282	// If we've scanned it and it is not a cleanup block, there will be a
2283	// nullptr in the CleanupHandlerMap. If we have not scanned it, there will
2284	// be no entry in the CleanupHandlerMap. We must call count() first to
2285	// avoid creating a null entry for blocks we haven't scanned.
2286	if (CleanupHandlerMap.count(BB)) {
2287	if (auto *Action = CleanupHandlerMap[BB]) {
2288	Actions.insertCleanupHandler(Action);
2289	DEBUG(dbgs() << " Found cleanup code in block "do { if (::llvm::DebugFlag && ::llvm::isCurrentDebugType ("winehprepare")) { dbgs() << " Found cleanup code in block " << Action->getStartBlock()->getName() << "\n" ; } } while (0)
2290	<< Action->getStartBlock()->getName() << "\n")do { if (::llvm::DebugFlag && ::llvm::isCurrentDebugType ("winehprepare")) { dbgs() << " Found cleanup code in block " << Action->getStartBlock()->getName() << "\n" ; } } while (0);
2291	// FIXME: This cleanup might chain into another, and we need to discover
2292	// that.
2293	return;
2294	} else {
2295	// Here we handle the case where the cleanup handler map contains a
2296	// value for this block but the value is a nullptr. This means that
2297	// we have previously analyzed the block and determined that it did
2298	// not contain any cleanup code. Based on the earlier analysis, we
2299	// know the block must end in either an unconditional branch, a
2300	// resume or a conditional branch that is predicated on a comparison
2301	// with a selector. Either the resume or the selector dispatch
2302	// would terminate the search for cleanup code, so the unconditional
2303	// branch is the only case for which we might need to continue
2304	// searching.
2305	BasicBlock *SuccBB = followSingleUnconditionalBranches(BB);
2306	if (SuccBB == BB \|\| SuccBB == EndBB)
2307	return;
2308	BB = SuccBB;
2309	continue;
2310	}
2311	}
2312
2313	// Create an entry in the cleanup handler map for this block. Initially
2314	// we create an entry that says this isn't a cleanup block. If we find
2315	// cleanup code, the caller will replace this entry.
2316	CleanupHandlerMap[BB] = nullptr;
2317
2318	TerminatorInst *Terminator = BB->getTerminator();
2319
2320	// Landing pad blocks have extra instructions we need to accept.
2321	LandingPadMap *LPadMap = nullptr;
2322	if (BB->isLandingPad()) {
2323	LandingPadInst *LPad = BB->getLandingPadInst();
2324	LPadMap = &LPadMaps[LPad];
2325	if (!LPadMap->isInitialized())
2326	LPadMap->mapLandingPad(LPad);
2327	}
2328
2329	// Look for the bare resume pattern:
2330	// %lpad.val1 = insertvalue { i8, i32 } undef, i8 %exn, 0
2331	// %lpad.val2 = insertvalue { i8*, i32 } %lpad.val1, i32 %sel, 1
2332	// resume { i8*, i32 } %lpad.val2
2333	if (auto *Resume = dyn_cast<ResumeInst>(Terminator)) {
2334	InsertValueInst *Insert1 = nullptr;
2335	InsertValueInst *Insert2 = nullptr;
2336	Value *ResumeVal = Resume->getOperand(0);
2337	// If the resume value isn't a phi or landingpad value, it should be a
2338	// series of insertions. Identify them so we can avoid them when scanning
2339	// for cleanups.
2340	if (!isa<PHINode>(ResumeVal) && !isa<LandingPadInst>(ResumeVal)) {
2341	Insert2 = dyn_cast<InsertValueInst>(ResumeVal);
2342	if (!Insert2)
2343	return createCleanupHandler(Actions, CleanupHandlerMap, BB);
2344	Insert1 = dyn_cast<InsertValueInst>(Insert2->getAggregateOperand());
2345	if (!Insert1)
2346	return createCleanupHandler(Actions, CleanupHandlerMap, BB);
2347	}
2348	for (BasicBlock::iterator II = BB->getFirstNonPHIOrDbg(), IE = BB->end();
2349	II != IE; ++II) {
2350	Instruction *Inst = II;
2351	if (LPadMap && LPadMap->isLandingPadSpecificInst(Inst))
2352	continue;
2353	if (Inst == Insert1 \|\| Inst == Insert2 \|\| Inst == Resume)
2354	continue;
2355	if (!Inst->hasOneUse() \|\|
2356	(Inst->user_back() != Insert1 && Inst->user_back() != Insert2)) {
2357	return createCleanupHandler(Actions, CleanupHandlerMap, BB);
2358	}
2359	}
2360	return;
2361	}
2362
2363	BranchInst *Branch = dyn_cast<BranchInst>(Terminator);
2364	if (Branch && Branch->isConditional()) {
2365	// Look for the selector dispatch.
2366	// %2 = call i32 @llvm.eh.typeid.for(i8* bitcast (i8** @_ZTIf to i8*))
2367	// %matches = icmp eq i32 %sel, %2
2368	// br i1 %matches, label %catch14, label %eh.resume
2369	CmpInst *Compare = dyn_cast<CmpInst>(Branch->getCondition());
2370	if (!Compare \|\| !Compare->isEquality())
2371	return createCleanupHandler(Actions, CleanupHandlerMap, BB);
2372	for (BasicBlock::iterator II = BB->getFirstNonPHIOrDbg(), IE = BB->end();
2373	II != IE; ++II) {
2374	Instruction *Inst = II;
2375	if (LPadMap && LPadMap->isLandingPadSpecificInst(Inst))
2376	continue;
2377	if (Inst == Compare \|\| Inst == Branch)
2378	continue;
2379	if (match(Inst, m_Intrinsic<Intrinsic::eh_typeid_for>()))
2380	continue;
2381	return createCleanupHandler(Actions, CleanupHandlerMap, BB);
2382	}
2383	// The selector dispatch block should always terminate our search.
2384	assert(BB == EndBB)((BB == EndBB) ? static_cast<void> (0) : __assert_fail ( "BB == EndBB", "/tmp/buildd/llvm-toolchain-snapshot-3.7~svn240924/lib/CodeGen/WinEHPrepare.cpp" , 2384, __PRETTY_FUNCTION__));
2385	return;
2386	}
2387
2388	if (isAsynchronousEHPersonality(Personality)) {
2389	// If this is a landingpad block, split the block at the first non-landing
2390	// pad instruction.
2391	Instruction *MaybeCall = BB->getFirstNonPHIOrDbg();
2392	if (LPadMap) {
2393	while (MaybeCall != BB->getTerminator() &&
2394	LPadMap->isLandingPadSpecificInst(MaybeCall))
2395	MaybeCall = MaybeCall->getNextNode();
2396	}
2397
2398	// Look for outlined finally calls.
2399	if (CallSite FinallyCall = matchOutlinedFinallyCall(BB, MaybeCall)) {
2400	Function *Fin = FinallyCall.getCalledFunction();
2401	assert(Fin && "outlined finally call should be direct")((Fin && "outlined finally call should be direct") ? static_cast <void> (0) : __assert_fail ("Fin && \"outlined finally call should be direct\"" , "/tmp/buildd/llvm-toolchain-snapshot-3.7~svn240924/lib/CodeGen/WinEHPrepare.cpp" , 2401, __PRETTY_FUNCTION__));
2402	auto *Action = new CleanupHandler(BB);
2403	Action->setHandlerBlockOrFunc(Fin);
2404	Actions.insertCleanupHandler(Action);
2405	CleanupHandlerMap[BB] = Action;
2406	DEBUG(dbgs() << " Found frontend-outlined finally call to "do { if (::llvm::DebugFlag && ::llvm::isCurrentDebugType ("winehprepare")) { dbgs() << " Found frontend-outlined finally call to " << Fin->getName() << " in block " << Action ->getStartBlock()->getName() << "\n"; } } while ( 0)
2407	<< Fin->getName() << " in block "do { if (::llvm::DebugFlag && ::llvm::isCurrentDebugType ("winehprepare")) { dbgs() << " Found frontend-outlined finally call to " << Fin->getName() << " in block " << Action ->getStartBlock()->getName() << "\n"; } } while ( 0)
2408	<< Action->getStartBlock()->getName() << "\n")do { if (::llvm::DebugFlag && ::llvm::isCurrentDebugType ("winehprepare")) { dbgs() << " Found frontend-outlined finally call to " << Fin->getName() << " in block " << Action ->getStartBlock()->getName() << "\n"; } } while ( 0);
2409
2410	// Split the block if there were more interesting instructions and look
2411	// for finally calls in the normal successor block.
2412	BasicBlock *SuccBB = BB;
	Value stored to 'SuccBB' during its initialization is never read
2413	if (FinallyCall.getInstruction() != BB->getTerminator() &&
2414	FinallyCall.getInstruction()->getNextNode() !=
2415	BB->getTerminator()) {
2416	SuccBB =
2417	SplitBlock(BB, FinallyCall.getInstruction()->getNextNode(), DT);
2418	} else {
2419	if (FinallyCall.isInvoke()) {
2420	SuccBB =
2421	cast<InvokeInst>(FinallyCall.getInstruction())->getNormalDest();
2422	} else {
2423	SuccBB = BB->getUniqueSuccessor();
2424	assert(SuccBB &&((SuccBB && "splitOutlinedFinallyCalls didn't insert a branch" ) ? static_cast<void> (0) : __assert_fail ("SuccBB && \"splitOutlinedFinallyCalls didn't insert a branch\"" , "/tmp/buildd/llvm-toolchain-snapshot-3.7~svn240924/lib/CodeGen/WinEHPrepare.cpp" , 2425, __PRETTY_FUNCTION__))
2425	"splitOutlinedFinallyCalls didn't insert a branch")((SuccBB && "splitOutlinedFinallyCalls didn't insert a branch" ) ? static_cast<void> (0) : __assert_fail ("SuccBB && \"splitOutlinedFinallyCalls didn't insert a branch\"" , "/tmp/buildd/llvm-toolchain-snapshot-3.7~svn240924/lib/CodeGen/WinEHPrepare.cpp" , 2425, __PRETTY_FUNCTION__));
2426	}
2427	}
2428	BB = SuccBB;
2429	if (BB == EndBB)
2430	return;
2431	continue;
2432	}
2433	}
2434
2435	// Anything else is either a catch block or interesting cleanup code.
2436	for (BasicBlock::iterator II = BB->getFirstNonPHIOrDbg(), IE = BB->end();
2437	II != IE; ++II) {
2438	Instruction *Inst = II;
2439	if (LPadMap && LPadMap->isLandingPadSpecificInst(Inst))
2440	continue;
2441	// Unconditional branches fall through to this loop.
2442	if (Inst == Branch)
2443	continue;
2444	// If this is a catch block, there is no cleanup code to be found.
2445	if (match(Inst, m_Intrinsic<Intrinsic::eh_begincatch>()))
2446	return;
2447	// If this a nested landing pad, it may contain an endcatch call.
2448	if (match(Inst, m_Intrinsic<Intrinsic::eh_endcatch>()))
2449	return;
2450	// Anything else makes this interesting cleanup code.
2451	return createCleanupHandler(Actions, CleanupHandlerMap, BB);
2452	}
2453
2454	// Only unconditional branches in empty blocks should get this far.
2455	assert(Branch && Branch->isUnconditional())((Branch && Branch->isUnconditional()) ? static_cast <void> (0) : __assert_fail ("Branch && Branch->isUnconditional()" , "/tmp/buildd/llvm-toolchain-snapshot-3.7~svn240924/lib/CodeGen/WinEHPrepare.cpp" , 2455, __PRETTY_FUNCTION__));
2456	if (BB == EndBB)
2457	return;
2458	BB = Branch->getSuccessor(0);
2459	}
2460	}
2461
2462	// This is a public function, declared in WinEHFuncInfo.h and is also
2463	// referenced by WinEHNumbering in FunctionLoweringInfo.cpp.
2464	void llvm::parseEHActions(
2465	const IntrinsicInst *II,
2466	SmallVectorImpl<std::unique_ptr<ActionHandler>> &Actions) {
2467	assert(II->getIntrinsicID() == Intrinsic::eh_actions &&((II->getIntrinsicID() == Intrinsic::eh_actions && "attempted to parse non eh.actions intrinsic") ? static_cast <void> (0) : __assert_fail ("II->getIntrinsicID() == Intrinsic::eh_actions && \"attempted to parse non eh.actions intrinsic\"" , "/tmp/buildd/llvm-toolchain-snapshot-3.7~svn240924/lib/CodeGen/WinEHPrepare.cpp" , 2468, __PRETTY_FUNCTION__))
2468	"attempted to parse non eh.actions intrinsic")((II->getIntrinsicID() == Intrinsic::eh_actions && "attempted to parse non eh.actions intrinsic") ? static_cast <void> (0) : __assert_fail ("II->getIntrinsicID() == Intrinsic::eh_actions && \"attempted to parse non eh.actions intrinsic\"" , "/tmp/buildd/llvm-toolchain-snapshot-3.7~svn240924/lib/CodeGen/WinEHPrepare.cpp" , 2468, __PRETTY_FUNCTION__));
2469	for (unsigned I = 0, E = II->getNumArgOperands(); I != E;) {
2470	uint64_t ActionKind =
2471	cast<ConstantInt>(II->getArgOperand(I))->getZExtValue();
2472	if (ActionKind == /catch=/1) {
2473	auto *Selector = cast<Constant>(II->getArgOperand(I + 1));
2474	ConstantInt *EHObjIndex = cast<ConstantInt>(II->getArgOperand(I + 2));
2475	int64_t EHObjIndexVal = EHObjIndex->getSExtValue();
2476	Constant *Handler = cast<Constant>(II->getArgOperand(I + 3));
2477	I += 4;
2478	auto CH = make_unique<CatchHandler>(/BB=/nullptr, Selector,
2479	/NextBB=/nullptr);
2480	CH->setHandlerBlockOrFunc(Handler);
2481	CH->setExceptionVarIndex(EHObjIndexVal);
2482	Actions.push_back(std::move(CH));
2483	} else if (ActionKind == 0) {
2484	Constant *Handler = cast<Constant>(II->getArgOperand(I + 1));
2485	I += 2;
2486	auto CH = make_unique<CleanupHandler>(/BB=/nullptr);
2487	CH->setHandlerBlockOrFunc(Handler);
2488	Actions.push_back(std::move(CH));
2489	} else {
2490	llvm_unreachable("Expected either a catch or cleanup handler!")::llvm::llvm_unreachable_internal("Expected either a catch or cleanup handler!" , "/tmp/buildd/llvm-toolchain-snapshot-3.7~svn240924/lib/CodeGen/WinEHPrepare.cpp" , 2490);
2491	}
2492	}
2493	std::reverse(Actions.begin(), Actions.end());
2494	}
2495
2496	namespace {
2497	struct WinEHNumbering {
2498	WinEHNumbering(WinEHFuncInfo &FuncInfo) : FuncInfo(FuncInfo),
2499	CurrentBaseState(-1), NextState(0) {}
2500
2501	WinEHFuncInfo &FuncInfo;
2502	int CurrentBaseState;
2503	int NextState;
2504
2505	SmallVector<std::unique_ptr<ActionHandler>, 4> HandlerStack;
2506	SmallPtrSet<const Function *, 4> VisitedHandlers;
2507
2508	int currentEHNumber() const {
2509	return HandlerStack.empty() ? CurrentBaseState : HandlerStack.back()->getEHState();
2510	}
2511
2512	void createUnwindMapEntry(int ToState, ActionHandler *AH);
2513	void createTryBlockMapEntry(int TryLow, int TryHigh,
2514	ArrayRef<CatchHandler *> Handlers);
2515	void processCallSite(MutableArrayRef<std::unique_ptr<ActionHandler>> Actions,
2516	ImmutableCallSite CS);
2517	void popUnmatchedActions(int FirstMismatch);
2518	void calculateStateNumbers(const Function &F);
2519	void findActionRootLPads(const Function &F);
2520	};
2521	}
2522
2523	void WinEHNumbering::createUnwindMapEntry(int ToState, ActionHandler *AH) {
2524	WinEHUnwindMapEntry UME;
2525	UME.ToState = ToState;
2526	if (auto *CH = dyn_cast_or_null<CleanupHandler>(AH))
2527	UME.Cleanup = cast<Function>(CH->getHandlerBlockOrFunc());
2528	else
2529	UME.Cleanup = nullptr;
2530	FuncInfo.UnwindMap.push_back(UME);
2531	}
2532
2533	void WinEHNumbering::createTryBlockMapEntry(int TryLow, int TryHigh,
2534	ArrayRef<CatchHandler *> Handlers) {
2535	// See if we already have an entry for this set of handlers.
2536	// This is using iterators rather than a range-based for loop because
2537	// if we find the entry we're looking for we'll need the iterator to erase it.
2538	int NumHandlers = Handlers.size();
2539	auto I = FuncInfo.TryBlockMap.begin();
2540	auto E = FuncInfo.TryBlockMap.end();
2541	for ( ; I != E; ++I) {
2542	auto &Entry = *I;
2543	if (Entry.HandlerArray.size() != (size_t)NumHandlers)
2544	continue;
2545	int N;
2546	for (N = 0; N < NumHandlers; ++N) {
2547	if (Entry.HandlerArray[N].Handler != Handlers[N]->getHandlerBlockOrFunc())
2548	break; // breaks out of inner loop
2549	}
2550	// If all the handlers match, this is what we were looking for.
2551	if (N == NumHandlers) {
2552	break;
2553	}
2554	}
2555
2556	// If we found an existing entry for this set of handlers, extend the range
2557	// but move the entry to the end of the map vector. The order of entries
2558	// in the map is critical to the way that the runtime finds handlers.
2559	// FIXME: Depending on what has happened with block ordering, this may
2560	// incorrectly combine entries that should remain separate.
2561	if (I != E) {
2562	// Copy the existing entry.
2563	WinEHTryBlockMapEntry Entry = *I;
2564	Entry.TryLow = std::min(TryLow, Entry.TryLow);
2565	Entry.TryHigh = std::max(TryHigh, Entry.TryHigh);
2566	assert(Entry.TryLow <= Entry.TryHigh)((Entry.TryLow <= Entry.TryHigh) ? static_cast<void> (0) : __assert_fail ("Entry.TryLow <= Entry.TryHigh", "/tmp/buildd/llvm-toolchain-snapshot-3.7~svn240924/lib/CodeGen/WinEHPrepare.cpp" , 2566, __PRETTY_FUNCTION__));
2567	// Erase the old entry and add this one to the back.
2568	FuncInfo.TryBlockMap.erase(I);
2569	FuncInfo.TryBlockMap.push_back(Entry);
2570	return;
2571	}
2572
2573	// If we didn't find an entry, create a new one.
2574	WinEHTryBlockMapEntry TBME;
2575	TBME.TryLow = TryLow;
2576	TBME.TryHigh = TryHigh;
2577	assert(TBME.TryLow <= TBME.TryHigh)((TBME.TryLow <= TBME.TryHigh) ? static_cast<void> ( 0) : __assert_fail ("TBME.TryLow <= TBME.TryHigh", "/tmp/buildd/llvm-toolchain-snapshot-3.7~svn240924/lib/CodeGen/WinEHPrepare.cpp" , 2577, __PRETTY_FUNCTION__));
2578	for (CatchHandler *CH : Handlers) {
2579	WinEHHandlerType HT;
2580	if (CH->getSelector()->isNullValue()) {
2581	HT.Adjectives = 0x40;
2582	HT.TypeDescriptor = nullptr;
2583	} else {
2584	auto *GV = cast<GlobalVariable>(CH->getSelector()->stripPointerCasts());
2585	// Selectors are always pointers to GlobalVariables with 'struct' type.
2586	// The struct has two fields, adjectives and a type descriptor.
2587	auto *CS = cast<ConstantStruct>(GV->getInitializer());
2588	HT.Adjectives =
2589	cast<ConstantInt>(CS->getAggregateElement(0U))->getZExtValue();
2590	HT.TypeDescriptor =
2591	cast<GlobalVariable>(CS->getAggregateElement(1)->stripPointerCasts());
2592	}
2593	HT.Handler = cast<Function>(CH->getHandlerBlockOrFunc());
2594	HT.CatchObjRecoverIdx = CH->getExceptionVarIndex();
2595	TBME.HandlerArray.push_back(HT);
2596	}
2597	FuncInfo.TryBlockMap.push_back(TBME);
2598	}
2599
2600	static void print_name(const Value *V) {
2601	#ifndef NDEBUG
2602	if (!V) {
2603	DEBUG(dbgs() << "null")do { if (::llvm::DebugFlag && ::llvm::isCurrentDebugType ("winehprepare")) { dbgs() << "null"; } } while (0);
2604	return;
2605	}
2606
2607	if (const auto *F = dyn_cast<Function>(V))
2608	DEBUG(dbgs() << F->getName())do { if (::llvm::DebugFlag && ::llvm::isCurrentDebugType ("winehprepare")) { dbgs() << F->getName(); } } while (0);
2609	else
2610	DEBUG(V->dump())do { if (::llvm::DebugFlag && ::llvm::isCurrentDebugType ("winehprepare")) { V->dump(); } } while (0);
2611	#endif
2612	}
2613
2614	void WinEHNumbering::processCallSite(
2615	MutableArrayRef<std::unique_ptr<ActionHandler>> Actions,
2616	ImmutableCallSite CS) {
2617	DEBUG(dbgs() << "processCallSite (EH state = " << currentEHNumber()do { if (::llvm::DebugFlag && ::llvm::isCurrentDebugType ("winehprepare")) { dbgs() << "processCallSite (EH state = " << currentEHNumber() << ") for: "; } } while (0)
2618	<< ") for: ")do { if (::llvm::DebugFlag && ::llvm::isCurrentDebugType ("winehprepare")) { dbgs() << "processCallSite (EH state = " << currentEHNumber() << ") for: "; } } while (0);
2619	print_name(CS ? CS.getCalledValue() : nullptr);
2620	DEBUG(dbgs() << '\n')do { if (::llvm::DebugFlag && ::llvm::isCurrentDebugType ("winehprepare")) { dbgs() << '\n'; } } while (0);
2621
2622	DEBUG(dbgs() << "HandlerStack: \n")do { if (::llvm::DebugFlag && ::llvm::isCurrentDebugType ("winehprepare")) { dbgs() << "HandlerStack: \n"; } } while (0);
2623	for (int I = 0, E = HandlerStack.size(); I < E; ++I) {
2624	DEBUG(dbgs() << " ")do { if (::llvm::DebugFlag && ::llvm::isCurrentDebugType ("winehprepare")) { dbgs() << " "; } } while (0);
2625	print_name(HandlerStack[I]->getHandlerBlockOrFunc());
2626	DEBUG(dbgs() << '\n')do { if (::llvm::DebugFlag && ::llvm::isCurrentDebugType ("winehprepare")) { dbgs() << '\n'; } } while (0);
2627	}
2628	DEBUG(dbgs() << "Actions: \n")do { if (::llvm::DebugFlag && ::llvm::isCurrentDebugType ("winehprepare")) { dbgs() << "Actions: \n"; } } while ( 0);
2629	for (int I = 0, E = Actions.size(); I < E; ++I) {
2630	DEBUG(dbgs() << " ")do { if (::llvm::DebugFlag && ::llvm::isCurrentDebugType ("winehprepare")) { dbgs() << " "; } } while (0);
2631	print_name(Actions[I]->getHandlerBlockOrFunc());
2632	DEBUG(dbgs() << '\n')do { if (::llvm::DebugFlag && ::llvm::isCurrentDebugType ("winehprepare")) { dbgs() << '\n'; } } while (0);
2633	}
2634	int FirstMismatch = 0;
2635	for (int E = std::min(HandlerStack.size(), Actions.size()); FirstMismatch < E;
2636	++FirstMismatch) {
2637	if (HandlerStack[FirstMismatch]->getHandlerBlockOrFunc() !=
2638	Actions[FirstMismatch]->getHandlerBlockOrFunc())
2639	break;
2640	}
2641
2642	// Remove unmatched actions from the stack and process their EH states.
2643	popUnmatchedActions(FirstMismatch);
2644
2645	DEBUG(dbgs() << "Pushing actions for CallSite: ")do { if (::llvm::DebugFlag && ::llvm::isCurrentDebugType ("winehprepare")) { dbgs() << "Pushing actions for CallSite: " ; } } while (0);
2646	print_name(CS ? CS.getCalledValue() : nullptr);
2647	DEBUG(dbgs() << '\n')do { if (::llvm::DebugFlag && ::llvm::isCurrentDebugType ("winehprepare")) { dbgs() << '\n'; } } while (0);
2648
2649	bool LastActionWasCatch = false;
2650	const LandingPadInst *LastRootLPad = nullptr;
2651	for (size_t I = FirstMismatch; I != Actions.size(); ++I) {
2652	// We can reuse eh states when pushing two catches for the same invoke.
2653	bool CurrActionIsCatch = isa<CatchHandler>(Actions[I].get());
2654	auto *Handler = cast<Function>(Actions[I]->getHandlerBlockOrFunc());
2655	// Various conditions can lead to a handler being popped from the
2656	// stack and re-pushed later. That shouldn't create a new state.
2657	// FIXME: Can code optimization lead to re-used handlers?
2658	if (FuncInfo.HandlerEnclosedState.count(Handler)) {
2659	// If we already assigned the state enclosed by this handler re-use it.
2660	Actions[I]->setEHState(FuncInfo.HandlerEnclosedState[Handler]);
2661	continue;
2662	}
2663	const LandingPadInst* RootLPad = FuncInfo.RootLPad[Handler];
2664	if (CurrActionIsCatch && LastActionWasCatch && RootLPad == LastRootLPad) {
2665	DEBUG(dbgs() << "setEHState for handler to " << currentEHNumber() << "\n")do { if (::llvm::DebugFlag && ::llvm::isCurrentDebugType ("winehprepare")) { dbgs() << "setEHState for handler to " << currentEHNumber() << "\n"; } } while (0);
2666	Actions[I]->setEHState(currentEHNumber());
2667	} else {
2668	DEBUG(dbgs() << "createUnwindMapEntry(" << currentEHNumber() << ", ")do { if (::llvm::DebugFlag && ::llvm::isCurrentDebugType ("winehprepare")) { dbgs() << "createUnwindMapEntry(" << currentEHNumber() << ", "; } } while (0);
2669	print_name(Actions[I]->getHandlerBlockOrFunc());
2670	DEBUG(dbgs() << ") with EH state " << NextState << "\n")do { if (::llvm::DebugFlag && ::llvm::isCurrentDebugType ("winehprepare")) { dbgs() << ") with EH state " << NextState << "\n"; } } while (0);
2671	createUnwindMapEntry(currentEHNumber(), Actions[I].get());
2672	DEBUG(dbgs() << "setEHState for handler to " << NextState << "\n")do { if (::llvm::DebugFlag && ::llvm::isCurrentDebugType ("winehprepare")) { dbgs() << "setEHState for handler to " << NextState << "\n"; } } while (0);
2673	Actions[I]->setEHState(NextState);
2674	NextState++;
2675	}
2676	HandlerStack.push_back(std::move(Actions[I]));
2677	LastActionWasCatch = CurrActionIsCatch;
2678	LastRootLPad = RootLPad;
2679	}
2680
2681	// This is used to defer numbering states for a handler until after the
2682	// last time it appears in an invoke action list.
2683	if (CS.isInvoke()) {
2684	for (int I = 0, E = HandlerStack.size(); I < E; ++I) {
2685	auto *Handler = cast<Function>(HandlerStack[I]->getHandlerBlockOrFunc());
2686	if (FuncInfo.LastInvoke[Handler] != cast<InvokeInst>(CS.getInstruction()))
2687	continue;
2688	FuncInfo.LastInvokeVisited[Handler] = true;
2689	DEBUG(dbgs() << "Last invoke of ")do { if (::llvm::DebugFlag && ::llvm::isCurrentDebugType ("winehprepare")) { dbgs() << "Last invoke of "; } } while (0);
2690	print_name(Handler);
2691	DEBUG(dbgs() << " has been visited.\n")do { if (::llvm::DebugFlag && ::llvm::isCurrentDebugType ("winehprepare")) { dbgs() << " has been visited.\n"; } } while (0);
2692	}
2693	}
2694
2695	DEBUG(dbgs() << "In EHState " << currentEHNumber() << " for CallSite: ")do { if (::llvm::DebugFlag && ::llvm::isCurrentDebugType ("winehprepare")) { dbgs() << "In EHState " << currentEHNumber () << " for CallSite: "; } } while (0);
2696	print_name(CS ? CS.getCalledValue() : nullptr);
2697	DEBUG(dbgs() << '\n')do { if (::llvm::DebugFlag && ::llvm::isCurrentDebugType ("winehprepare")) { dbgs() << '\n'; } } while (0);
2698	}
2699
2700	void WinEHNumbering::popUnmatchedActions(int FirstMismatch) {
2701	// Don't recurse while we are looping over the handler stack. Instead, defer
2702	// the numbering of the catch handlers until we are done popping.
2703	SmallVector<CatchHandler *, 4> PoppedCatches;
2704	for (int I = HandlerStack.size() - 1; I >= FirstMismatch; --I) {
2705	std::unique_ptr<ActionHandler> Handler = HandlerStack.pop_back_val();
2706	if (isa<CatchHandler>(Handler.get()))
2707	PoppedCatches.push_back(cast<CatchHandler>(Handler.release()));
2708	}
2709
2710	int TryHigh = NextState - 1;
2711	int LastTryLowIdx = 0;
2712	for (int I = 0, E = PoppedCatches.size(); I != E; ++I) {
2713	CatchHandler *CH = PoppedCatches[I];
2714	DEBUG(dbgs() << "Popped handler with state " << CH->getEHState() << "\n")do { if (::llvm::DebugFlag && ::llvm::isCurrentDebugType ("winehprepare")) { dbgs() << "Popped handler with state " << CH->getEHState() << "\n"; } } while (0);
2715	if (I + 1 == E \|\| CH->getEHState() != PoppedCatches[I + 1]->getEHState()) {
2716	int TryLow = CH->getEHState();
2717	auto Handlers =
2718	makeArrayRef(&PoppedCatches[LastTryLowIdx], I - LastTryLowIdx + 1);
2719	DEBUG(dbgs() << "createTryBlockMapEntry(" << TryLow << ", " << TryHigh)do { if (::llvm::DebugFlag && ::llvm::isCurrentDebugType ("winehprepare")) { dbgs() << "createTryBlockMapEntry(" << TryLow << ", " << TryHigh; } } while (0 );
2720	for (size_t J = 0; J < Handlers.size(); ++J) {
2721	DEBUG(dbgs() << ", ")do { if (::llvm::DebugFlag && ::llvm::isCurrentDebugType ("winehprepare")) { dbgs() << ", "; } } while (0);
2722	print_name(Handlers[J]->getHandlerBlockOrFunc());
2723	}
2724	DEBUG(dbgs() << ")\n")do { if (::llvm::DebugFlag && ::llvm::isCurrentDebugType ("winehprepare")) { dbgs() << ")\n"; } } while (0);
2725	createTryBlockMapEntry(TryLow, TryHigh, Handlers);
2726	LastTryLowIdx = I + 1;
2727	}
2728	}
2729
2730	for (CatchHandler *CH : PoppedCatches) {
2731	if (auto *F = dyn_cast<Function>(CH->getHandlerBlockOrFunc())) {
2732	if (FuncInfo.LastInvokeVisited[F]) {
2733	DEBUG(dbgs() << "Assigning base state " << NextState << " to ")do { if (::llvm::DebugFlag && ::llvm::isCurrentDebugType ("winehprepare")) { dbgs() << "Assigning base state " << NextState << " to "; } } while (0);
2734	print_name(F);
2735	DEBUG(dbgs() << '\n')do { if (::llvm::DebugFlag && ::llvm::isCurrentDebugType ("winehprepare")) { dbgs() << '\n'; } } while (0);
2736	FuncInfo.HandlerBaseState[F] = NextState;
2737	DEBUG(dbgs() << "createUnwindMapEntry(" << currentEHNumber()do { if (::llvm::DebugFlag && ::llvm::isCurrentDebugType ("winehprepare")) { dbgs() << "createUnwindMapEntry(" << currentEHNumber() << ", null)\n"; } } while (0)
2738	<< ", null)\n")do { if (::llvm::DebugFlag && ::llvm::isCurrentDebugType ("winehprepare")) { dbgs() << "createUnwindMapEntry(" << currentEHNumber() << ", null)\n"; } } while (0);
2739	createUnwindMapEntry(currentEHNumber(), nullptr);
2740	++NextState;
2741	calculateStateNumbers(*F);
2742	}
2743	else {
2744	DEBUG(dbgs() << "Deferring handling of ")do { if (::llvm::DebugFlag && ::llvm::isCurrentDebugType ("winehprepare")) { dbgs() << "Deferring handling of "; } } while (0);
2745	print_name(F);
2746	DEBUG(dbgs() << " until last invoke visited.\n")do { if (::llvm::DebugFlag && ::llvm::isCurrentDebugType ("winehprepare")) { dbgs() << " until last invoke visited.\n" ; } } while (0);
2747	}
2748	}
2749	delete CH;
2750	}
2751	}
2752
2753	void WinEHNumbering::calculateStateNumbers(const Function &F) {
2754	auto I = VisitedHandlers.insert(&F);
2755	if (!I.second)
2756	return; // We've already visited this handler, don't renumber it.
2757
2758	int OldBaseState = CurrentBaseState;
2759	if (FuncInfo.HandlerBaseState.count(&F)) {
2760	CurrentBaseState = FuncInfo.HandlerBaseState[&F];
2761	}
2762
2763	size_t SavedHandlerStackSize = HandlerStack.size();
2764
2765	DEBUG(dbgs() << "Calculating state numbers for: " << F.getName() << '\n')do { if (::llvm::DebugFlag && ::llvm::isCurrentDebugType ("winehprepare")) { dbgs() << "Calculating state numbers for: " << F.getName() << '\n'; } } while (0);
2766	SmallVector<std::unique_ptr<ActionHandler>, 4> ActionList;
2767	for (const BasicBlock &BB : F) {
2768	for (const Instruction &I : BB) {
2769	const auto *CI = dyn_cast<CallInst>(&I);
2770	if (!CI \|\| CI->doesNotThrow())
2771	continue;
2772	processCallSite(None, CI);
2773	}
2774	const auto *II = dyn_cast<InvokeInst>(BB.getTerminator());
2775	if (!II)
2776	continue;
2777	const LandingPadInst *LPI = II->getLandingPadInst();
2778	auto *ActionsCall = dyn_cast<IntrinsicInst>(LPI->getNextNode());
2779	if (!ActionsCall)
2780	continue;
2781	parseEHActions(ActionsCall, ActionList);
2782	if (ActionList.empty())
2783	continue;
2784	processCallSite(ActionList, II);
2785	ActionList.clear();
2786	FuncInfo.LandingPadStateMap[LPI] = currentEHNumber();
2787	DEBUG(dbgs() << "Assigning state " << currentEHNumber()do { if (::llvm::DebugFlag && ::llvm::isCurrentDebugType ("winehprepare")) { dbgs() << "Assigning state " << currentEHNumber() << " to landing pad at " << LPI ->getParent()->getName() << '\n'; } } while (0)
2788	<< " to landing pad at " << LPI->getParent()->getName()do { if (::llvm::DebugFlag && ::llvm::isCurrentDebugType ("winehprepare")) { dbgs() << "Assigning state " << currentEHNumber() << " to landing pad at " << LPI ->getParent()->getName() << '\n'; } } while (0)
2789	<< '\n')do { if (::llvm::DebugFlag && ::llvm::isCurrentDebugType ("winehprepare")) { dbgs() << "Assigning state " << currentEHNumber() << " to landing pad at " << LPI ->getParent()->getName() << '\n'; } } while (0);
2790	}
2791
2792	// Pop any actions that were pushed on the stack for this function.
2793	popUnmatchedActions(SavedHandlerStackSize);
2794
2795	DEBUG(dbgs() << "Assigning max state " << NextState - 1do { if (::llvm::DebugFlag && ::llvm::isCurrentDebugType ("winehprepare")) { dbgs() << "Assigning max state " << NextState - 1 << " to " << F.getName() << '\n' ; } } while (0)
2796	<< " to " << F.getName() << '\n')do { if (::llvm::DebugFlag && ::llvm::isCurrentDebugType ("winehprepare")) { dbgs() << "Assigning max state " << NextState - 1 << " to " << F.getName() << '\n' ; } } while (0);
2797	FuncInfo.CatchHandlerMaxState[&F] = NextState - 1;
2798
2799	CurrentBaseState = OldBaseState;
2800	}
2801
2802	// This function follows the same basic traversal as calculateStateNumbers
2803	// but it is necessary to identify the root landing pad associated
2804	// with each action before we start assigning state numbers.
2805	void WinEHNumbering::findActionRootLPads(const Function &F) {
2806	auto I = VisitedHandlers.insert(&F);
2807	if (!I.second)
2808	return; // We've already visited this handler, don't revisit it.
2809
2810	SmallVector<std::unique_ptr<ActionHandler>, 4> ActionList;
2811	for (const BasicBlock &BB : F) {
2812	const auto *II = dyn_cast<InvokeInst>(BB.getTerminator());
2813	if (!II)
2814	continue;
2815	const LandingPadInst *LPI = II->getLandingPadInst();
2816	auto *ActionsCall = dyn_cast<IntrinsicInst>(LPI->getNextNode());
2817	if (!ActionsCall)
2818	continue;
2819
2820	assert(ActionsCall->getIntrinsicID() == Intrinsic::eh_actions)((ActionsCall->getIntrinsicID() == Intrinsic::eh_actions) ? static_cast<void> (0) : __assert_fail ("ActionsCall->getIntrinsicID() == Intrinsic::eh_actions" , "/tmp/buildd/llvm-toolchain-snapshot-3.7~svn240924/lib/CodeGen/WinEHPrepare.cpp" , 2820, __PRETTY_FUNCTION__));
2821	parseEHActions(ActionsCall, ActionList);
2822	if (ActionList.empty())
2823	continue;
2824	for (int I = 0, E = ActionList.size(); I < E; ++I) {
2825	if (auto *Handler
2826	= dyn_cast<Function>(ActionList[I]->getHandlerBlockOrFunc())) {
2827	FuncInfo.LastInvoke[Handler] = II;
2828	// Don't replace the root landing pad if we previously saw this
2829	// handler in a different function.
2830	if (FuncInfo.RootLPad.count(Handler) &&
2831	FuncInfo.RootLPad[Handler]->getParent()->getParent() != &F)
2832	continue;
2833	DEBUG(dbgs() << "Setting root lpad for ")do { if (::llvm::DebugFlag && ::llvm::isCurrentDebugType ("winehprepare")) { dbgs() << "Setting root lpad for "; } } while (0);
2834	print_name(Handler);
2835	DEBUG(dbgs() << " to " << LPI->getParent()->getName() << '\n')do { if (::llvm::DebugFlag && ::llvm::isCurrentDebugType ("winehprepare")) { dbgs() << " to " << LPI->getParent ()->getName() << '\n'; } } while (0);
2836	FuncInfo.RootLPad[Handler] = LPI;
2837	}
2838	}
2839	// Walk the actions again and look for nested handlers. This has to
2840	// happen after all of the actions have been processed in the current
2841	// function.
2842	for (int I = 0, E = ActionList.size(); I < E; ++I)
2843	if (auto *Handler
2844	= dyn_cast<Function>(ActionList[I]->getHandlerBlockOrFunc()))
2845	findActionRootLPads(*Handler);
2846	ActionList.clear();
2847	}
2848	}
2849
2850	void llvm::calculateWinCXXEHStateNumbers(const Function *ParentFn,
2851	WinEHFuncInfo &FuncInfo) {
2852	// Return if it's already been done.
2853	if (!FuncInfo.LandingPadStateMap.empty())
2854	return;
2855
2856	WinEHNumbering Num(FuncInfo);
2857	Num.findActionRootLPads(*ParentFn);
2858	// The VisitedHandlers list is used by both findActionRootLPads and
2859	// calculateStateNumbers, but both functions need to visit all handlers.
2860	Num.VisitedHandlers.clear();
2861	Num.calculateStateNumbers(*ParentFn);
2862	// Pop everything on the handler stack.
2863	// It may be necessary to call this more than once because a handler can
2864	// be pushed on the stack as a result of clearing the stack.
2865	while (!Num.HandlerStack.empty())
2866	Num.processCallSite(None, ImmutableCallSite());
2867	}