1//===- SjLjEHPrepare.cpp - Eliminate Invoke & Unwind instructions ---------===//
2//
3// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
4// See https://llvm.org/LICENSE.txt for license information.
5// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
6//
7//===----------------------------------------------------------------------===//
8//
9// This transformation is designed for use by code generators which use SjLj
10// based exception handling.
11//
12//===----------------------------------------------------------------------===//
13
14#include "llvm/CodeGen/SjLjEHPrepare.h"
15#include "llvm/ADT/SetVector.h"
16#include "llvm/ADT/SmallPtrSet.h"
17#include "llvm/ADT/SmallVector.h"
18#include "llvm/ADT/Statistic.h"
19#include "llvm/CodeGen/Passes.h"
20#include "llvm/IR/Constants.h"
21#include "llvm/IR/DataLayout.h"
22#include "llvm/IR/DerivedTypes.h"
23#include "llvm/IR/IRBuilder.h"
24#include "llvm/IR/Instructions.h"
25#include "llvm/IR/Intrinsics.h"
26#include "llvm/IR/Module.h"
27#include "llvm/InitializePasses.h"
28#include "llvm/Pass.h"
29#include "llvm/Support/Debug.h"
30#include "llvm/Support/raw_ostream.h"
31#include "llvm/Target/TargetMachine.h"
32#include "llvm/Transforms/Utils/Local.h"
33using namespace llvm;
34
35#define DEBUG_TYPE "sjlj-eh-prepare"
36
37STATISTIC(NumInvokes, "Number of invokes replaced");
38STATISTIC(NumSpilled, "Number of registers live across unwind edges");
39
40namespace {
41class SjLjEHPrepareImpl {
42 IntegerType *DataTy = nullptr;
43 Type *doubleUnderDataTy = nullptr;
44 Type *doubleUnderJBufTy = nullptr;
45 Type *FunctionContextTy = nullptr;
46 FunctionCallee RegisterFn;
47 FunctionCallee UnregisterFn;
48 Function *BuiltinSetupDispatchFn = nullptr;
49 Function *FrameAddrFn = nullptr;
50 Function *StackAddrFn = nullptr;
51 Function *StackRestoreFn = nullptr;
52 Function *LSDAAddrFn = nullptr;
53 Function *CallSiteFn = nullptr;
54 Function *FuncCtxFn = nullptr;
55 AllocaInst *FuncCtx = nullptr;
56 const TargetMachine *TM = nullptr;
57
58public:
59 explicit SjLjEHPrepareImpl(const TargetMachine *TM = nullptr) : TM(TM) {}
60 bool doInitialization(Module &M);
61 bool runOnFunction(Function &F);
62
63private:
64 bool setupEntryBlockAndCallSites(Function &F);
65 void substituteLPadValues(LandingPadInst *LPI, Value *ExnVal, Value *SelVal);
66 Value *setupFunctionContext(Function &F, ArrayRef<LandingPadInst *> LPads);
67 void lowerIncomingArguments(Function &F);
68 void lowerAcrossUnwindEdges(Function &F, ArrayRef<InvokeInst *> Invokes);
69 void insertCallSiteStore(Instruction *I, int Number);
70};
71
72class SjLjEHPrepare : public FunctionPass {
73 SjLjEHPrepareImpl Impl;
74
75public:
76 static char ID; // Pass identification, replacement for typeid
77 explicit SjLjEHPrepare(const TargetMachine *TM = nullptr)
78 : FunctionPass(ID), Impl(TM) {}
79 bool doInitialization(Module &M) override { return Impl.doInitialization(M); }
80 bool runOnFunction(Function &F) override { return Impl.runOnFunction(F); };
81
82 StringRef getPassName() const override {
83 return "SJLJ Exception Handling preparation";
84 }
85};
86
87} // end anonymous namespace
88
89PreservedAnalyses SjLjEHPreparePass::run(Function &F,
90 FunctionAnalysisManager &FAM) {
91 SjLjEHPrepareImpl Impl(TM);
92 Impl.doInitialization(M&: *F.getParent());
93 bool Changed = Impl.runOnFunction(F);
94 return Changed ? PreservedAnalyses::none() : PreservedAnalyses::all();
95}
96
97char SjLjEHPrepare::ID = 0;
98INITIALIZE_PASS(SjLjEHPrepare, DEBUG_TYPE, "Prepare SjLj exceptions",
99 false, false)
100
101// Public Interface To the SjLjEHPrepare pass.
102FunctionPass *llvm::createSjLjEHPreparePass(const TargetMachine *TM) {
103 return new SjLjEHPrepare(TM);
104}
105
106// doInitialization - Set up decalarations and types needed to process
107// exceptions.
108bool SjLjEHPrepareImpl::doInitialization(Module &M) {
109 // Build the function context structure.
110 // builtin_setjmp uses a five word jbuf
111 Type *VoidPtrTy = PointerType::getUnqual(C&: M.getContext());
112 unsigned DataBits =
113 TM ? TM->getSjLjDataSize() : TargetMachine::DefaultSjLjDataSize;
114 DataTy = Type::getIntNTy(C&: M.getContext(), N: DataBits);
115 doubleUnderDataTy = ArrayType::get(ElementType: DataTy, NumElements: 4);
116 doubleUnderJBufTy = ArrayType::get(ElementType: VoidPtrTy, NumElements: 5);
117 FunctionContextTy = StructType::get(elt1: VoidPtrTy, // __prev
118 elts: DataTy, // call_site
119 elts: doubleUnderDataTy, // __data
120 elts: VoidPtrTy, // __personality
121 elts: VoidPtrTy, // __lsda
122 elts: doubleUnderJBufTy // __jbuf
123 );
124
125 return false;
126}
127
128/// insertCallSiteStore - Insert a store of the call-site value to the
129/// function context
130void SjLjEHPrepareImpl::insertCallSiteStore(Instruction *I, int Number) {
131 IRBuilder<> Builder(I);
132
133 // Get a reference to the call_site field.
134 Type *Int32Ty = Type::getInt32Ty(C&: I->getContext());
135 Value *Zero = ConstantInt::get(Ty: Int32Ty, V: 0);
136 Value *One = ConstantInt::get(Ty: Int32Ty, V: 1);
137 Value *Idxs[2] = { Zero, One };
138 Value *CallSite =
139 Builder.CreateGEP(Ty: FunctionContextTy, Ptr: FuncCtx, IdxList: Idxs, Name: "call_site");
140
141 // Insert a store of the call-site number
142 ConstantInt *CallSiteNoC = ConstantInt::get(Ty: DataTy, V: Number);
143 Builder.CreateStore(Val: CallSiteNoC, Ptr: CallSite, isVolatile: true /*volatile*/);
144}
145
146/// MarkBlocksLiveIn - Insert BB and all of its predecessors into LiveBBs until
147/// we reach blocks we've already seen.
148static void MarkBlocksLiveIn(BasicBlock *BB,
149 SmallPtrSetImpl<BasicBlock *> &LiveBBs) {
150 if (!LiveBBs.insert(Ptr: BB).second)
151 return; // already been here.
152
153 df_iterator_default_set<BasicBlock*> Visited;
154
155 for (BasicBlock *B : inverse_depth_first_ext(G: BB, S&: Visited))
156 LiveBBs.insert(Ptr: B);
157}
158
159/// substituteLPadValues - Substitute the values returned by the landingpad
160/// instruction with those returned by the personality function.
161void SjLjEHPrepareImpl::substituteLPadValues(LandingPadInst *LPI, Value *ExnVal,
162 Value *SelVal) {
163 SmallVector<Value *, 8> UseWorkList(LPI->users());
164 while (!UseWorkList.empty()) {
165 Value *Val = UseWorkList.pop_back_val();
166 auto *EVI = dyn_cast<ExtractValueInst>(Val);
167 if (!EVI)
168 continue;
169 if (EVI->getNumIndices() != 1)
170 continue;
171 if (*EVI->idx_begin() == 0)
172 EVI->replaceAllUsesWith(V: ExnVal);
173 else if (*EVI->idx_begin() == 1)
174 EVI->replaceAllUsesWith(V: SelVal);
175 if (EVI->use_empty())
176 EVI->eraseFromParent();
177 }
178
179 if (LPI->use_empty())
180 return;
181
182 // There are still some uses of LPI. Construct an aggregate with the exception
183 // values and replace the LPI with that aggregate.
184 Type *LPadType = LPI->getType();
185 Value *LPadVal = PoisonValue::get(T: LPadType);
186 auto *SelI = cast<Instruction>(Val: SelVal);
187 IRBuilder<> Builder(SelI->getParent(), std::next(x: SelI->getIterator()));
188 LPadVal = Builder.CreateInsertValue(Agg: LPadVal, Val: ExnVal, Idxs: 0, Name: "lpad.val");
189 LPadVal = Builder.CreateInsertValue(Agg: LPadVal, Val: SelVal, Idxs: 1, Name: "lpad.val");
190
191 LPI->replaceAllUsesWith(V: LPadVal);
192}
193
194/// setupFunctionContext - Allocate the function context on the stack and fill
195/// it with all of the data that we know at this point.
196Value *
197SjLjEHPrepareImpl::setupFunctionContext(Function &F,
198 ArrayRef<LandingPadInst *> LPads) {
199 BasicBlock *EntryBB = &F.front();
200
201 // Create an alloca for the incoming jump buffer ptr and the new jump buffer
202 // that needs to be restored on all exits from the function. This is an alloca
203 // because the value needs to be added to the global context list.
204 auto &DL = F.getParent()->getDataLayout();
205 const Align Alignment = DL.getPrefTypeAlign(Ty: FunctionContextTy);
206 FuncCtx = new AllocaInst(FunctionContextTy, DL.getAllocaAddrSpace(), nullptr,
207 Alignment, "fn_context", &EntryBB->front());
208
209 // Fill in the function context structure.
210 for (LandingPadInst *LPI : LPads) {
211 IRBuilder<> Builder(LPI->getParent(),
212 LPI->getParent()->getFirstInsertionPt());
213
214 // Reference the __data field.
215 Value *FCData =
216 Builder.CreateConstGEP2_32(Ty: FunctionContextTy, Ptr: FuncCtx, Idx0: 0, Idx1: 2, Name: "__data");
217
218 // The exception values come back in context->__data[0].
219 Value *ExceptionAddr = Builder.CreateConstGEP2_32(Ty: doubleUnderDataTy, Ptr: FCData,
220 Idx0: 0, Idx1: 0, Name: "exception_gep");
221 Value *ExnVal = Builder.CreateLoad(Ty: DataTy, Ptr: ExceptionAddr, isVolatile: true, Name: "exn_val");
222 ExnVal = Builder.CreateIntToPtr(V: ExnVal, DestTy: Builder.getPtrTy());
223
224 Value *SelectorAddr = Builder.CreateConstGEP2_32(Ty: doubleUnderDataTy, Ptr: FCData,
225 Idx0: 0, Idx1: 1, Name: "exn_selector_gep");
226 Value *SelVal =
227 Builder.CreateLoad(Ty: DataTy, Ptr: SelectorAddr, isVolatile: true, Name: "exn_selector_val");
228
229 // SelVal must be Int32Ty, so trunc it
230 SelVal = Builder.CreateTrunc(V: SelVal, DestTy: Type::getInt32Ty(C&: F.getContext()));
231
232 substituteLPadValues(LPI, ExnVal, SelVal);
233 }
234
235 // Personality function
236 IRBuilder<> Builder(EntryBB->getTerminator());
237 Value *PersonalityFn = F.getPersonalityFn();
238 Value *PersonalityFieldPtr = Builder.CreateConstGEP2_32(
239 Ty: FunctionContextTy, Ptr: FuncCtx, Idx0: 0, Idx1: 3, Name: "pers_fn_gep");
240 Builder.CreateStore(Val: PersonalityFn, Ptr: PersonalityFieldPtr, /*isVolatile=*/true);
241
242 // LSDA address
243 Value *LSDA = Builder.CreateCall(Callee: LSDAAddrFn, Args: {}, Name: "lsda_addr");
244 Value *LSDAFieldPtr =
245 Builder.CreateConstGEP2_32(Ty: FunctionContextTy, Ptr: FuncCtx, Idx0: 0, Idx1: 4, Name: "lsda_gep");
246 Builder.CreateStore(Val: LSDA, Ptr: LSDAFieldPtr, /*isVolatile=*/true);
247
248 return FuncCtx;
249}
250
251/// lowerIncomingArguments - To avoid having to handle incoming arguments
252/// specially, we lower each arg to a copy instruction in the entry block. This
253/// ensures that the argument value itself cannot be live out of the entry
254/// block.
255void SjLjEHPrepareImpl::lowerIncomingArguments(Function &F) {
256 BasicBlock::iterator AfterAllocaInsPt = F.begin()->begin();
257 while (isa<AllocaInst>(Val: AfterAllocaInsPt) &&
258 cast<AllocaInst>(Val&: AfterAllocaInsPt)->isStaticAlloca())
259 ++AfterAllocaInsPt;
260 assert(AfterAllocaInsPt != F.front().end());
261
262 for (auto &AI : F.args()) {
263 // Swift error really is a register that we model as memory -- instruction
264 // selection will perform mem-to-reg for us and spill/reload appropriately
265 // around calls that clobber it. There is no need to spill this
266 // value to the stack and doing so would not be allowed.
267 if (AI.isSwiftError())
268 continue;
269
270 Type *Ty = AI.getType();
271
272 // Use 'select i8 true, %arg, undef' to simulate a 'no-op' instruction.
273 Value *TrueValue = ConstantInt::getTrue(Context&: F.getContext());
274 Value *UndefValue = UndefValue::get(T: Ty);
275 Instruction *SI = SelectInst::Create(
276 C: TrueValue, S1: &AI, S2: UndefValue, NameStr: AI.getName() + ".tmp", InsertBefore: &*AfterAllocaInsPt);
277 AI.replaceAllUsesWith(V: SI);
278
279 // Reset the operand, because it was clobbered by the RAUW above.
280 SI->setOperand(i: 1, Val: &AI);
281 }
282}
283
284/// lowerAcrossUnwindEdges - Find all variables which are alive across an unwind
285/// edge and spill them.
286void SjLjEHPrepareImpl::lowerAcrossUnwindEdges(Function &F,
287 ArrayRef<InvokeInst *> Invokes) {
288 // Finally, scan the code looking for instructions with bad live ranges.
289 for (BasicBlock &BB : F) {
290 for (Instruction &Inst : BB) {
291 // Ignore obvious cases we don't have to handle. In particular, most
292 // instructions either have no uses or only have a single use inside the
293 // current block. Ignore them quickly.
294 if (Inst.use_empty())
295 continue;
296 if (Inst.hasOneUse() &&
297 cast<Instruction>(Val: Inst.user_back())->getParent() == &BB &&
298 !isa<PHINode>(Val: Inst.user_back()))
299 continue;
300
301 // If this is an alloca in the entry block, it's not a real register
302 // value.
303 if (auto *AI = dyn_cast<AllocaInst>(Val: &Inst))
304 if (AI->isStaticAlloca())
305 continue;
306
307 // Avoid iterator invalidation by copying users to a temporary vector.
308 SmallVector<Instruction *, 16> Users;
309 for (User *U : Inst.users()) {
310 Instruction *UI = cast<Instruction>(Val: U);
311 if (UI->getParent() != &BB || isa<PHINode>(Val: UI))
312 Users.push_back(Elt: UI);
313 }
314
315 // Find all of the blocks that this value is live in.
316 SmallPtrSet<BasicBlock *, 32> LiveBBs;
317 LiveBBs.insert(Ptr: &BB);
318 while (!Users.empty()) {
319 Instruction *U = Users.pop_back_val();
320
321 if (!isa<PHINode>(Val: U)) {
322 MarkBlocksLiveIn(BB: U->getParent(), LiveBBs);
323 } else {
324 // Uses for a PHI node occur in their predecessor block.
325 PHINode *PN = cast<PHINode>(Val: U);
326 for (unsigned i = 0, e = PN->getNumIncomingValues(); i != e; ++i)
327 if (PN->getIncomingValue(i) == &Inst)
328 MarkBlocksLiveIn(BB: PN->getIncomingBlock(i), LiveBBs);
329 }
330 }
331
332 // Now that we know all of the blocks that this thing is live in, see if
333 // it includes any of the unwind locations.
334 bool NeedsSpill = false;
335 for (InvokeInst *Invoke : Invokes) {
336 BasicBlock *UnwindBlock = Invoke->getUnwindDest();
337 if (UnwindBlock != &BB && LiveBBs.count(Ptr: UnwindBlock)) {
338 LLVM_DEBUG(dbgs() << "SJLJ Spill: " << Inst << " around "
339 << UnwindBlock->getName() << "\n");
340 NeedsSpill = true;
341 break;
342 }
343 }
344
345 // If we decided we need a spill, do it.
346 // FIXME: Spilling this way is overkill, as it forces all uses of
347 // the value to be reloaded from the stack slot, even those that aren't
348 // in the unwind blocks. We should be more selective.
349 if (NeedsSpill) {
350 DemoteRegToStack(X&: Inst, VolatileLoads: true);
351 ++NumSpilled;
352 }
353 }
354 }
355
356 // Go through the landing pads and remove any PHIs there.
357 for (InvokeInst *Invoke : Invokes) {
358 BasicBlock *UnwindBlock = Invoke->getUnwindDest();
359 LandingPadInst *LPI = UnwindBlock->getLandingPadInst();
360
361 // Place PHIs into a set to avoid invalidating the iterator.
362 SmallPtrSet<PHINode *, 8> PHIsToDemote;
363 for (BasicBlock::iterator PN = UnwindBlock->begin(); isa<PHINode>(Val: PN); ++PN)
364 PHIsToDemote.insert(Ptr: cast<PHINode>(Val&: PN));
365 if (PHIsToDemote.empty())
366 continue;
367
368 // Demote the PHIs to the stack.
369 for (PHINode *PN : PHIsToDemote)
370 DemotePHIToStack(P: PN);
371
372 // Move the landingpad instruction back to the top of the landing pad block.
373 LPI->moveBefore(MovePos: &UnwindBlock->front());
374 }
375}
376
377/// setupEntryBlockAndCallSites - Setup the entry block by creating and filling
378/// the function context and marking the call sites with the appropriate
379/// values. These values are used by the DWARF EH emitter.
380bool SjLjEHPrepareImpl::setupEntryBlockAndCallSites(Function &F) {
381 SmallVector<ReturnInst *, 16> Returns;
382 SmallVector<InvokeInst *, 16> Invokes;
383 SmallSetVector<LandingPadInst *, 16> LPads;
384
385 // Look through the terminators of the basic blocks to find invokes.
386 for (BasicBlock &BB : F)
387 if (auto *II = dyn_cast<InvokeInst>(Val: BB.getTerminator())) {
388 if (Function *Callee = II->getCalledFunction())
389 if (Callee->getIntrinsicID() == Intrinsic::donothing) {
390 // Remove the NOP invoke.
391 BranchInst::Create(IfTrue: II->getNormalDest(), InsertBefore: II);
392 II->eraseFromParent();
393 continue;
394 }
395
396 Invokes.push_back(Elt: II);
397 LPads.insert(X: II->getUnwindDest()->getLandingPadInst());
398 } else if (auto *RI = dyn_cast<ReturnInst>(Val: BB.getTerminator())) {
399 Returns.push_back(Elt: RI);
400 }
401
402 if (Invokes.empty())
403 return false;
404
405 NumInvokes += Invokes.size();
406
407 lowerIncomingArguments(F);
408 lowerAcrossUnwindEdges(F, Invokes);
409
410 Value *FuncCtx =
411 setupFunctionContext(F, LPads: ArrayRef(LPads.begin(), LPads.end()));
412 BasicBlock *EntryBB = &F.front();
413 IRBuilder<> Builder(EntryBB->getTerminator());
414
415 // Get a reference to the jump buffer.
416 Value *JBufPtr =
417 Builder.CreateConstGEP2_32(Ty: FunctionContextTy, Ptr: FuncCtx, Idx0: 0, Idx1: 5, Name: "jbuf_gep");
418
419 // Save the frame pointer.
420 Value *FramePtr = Builder.CreateConstGEP2_32(Ty: doubleUnderJBufTy, Ptr: JBufPtr, Idx0: 0, Idx1: 0,
421 Name: "jbuf_fp_gep");
422
423 Value *Val = Builder.CreateCall(Callee: FrameAddrFn, Args: Builder.getInt32(C: 0), Name: "fp");
424 Builder.CreateStore(Val, Ptr: FramePtr, /*isVolatile=*/true);
425
426 // Save the stack pointer.
427 Value *StackPtr = Builder.CreateConstGEP2_32(Ty: doubleUnderJBufTy, Ptr: JBufPtr, Idx0: 0, Idx1: 2,
428 Name: "jbuf_sp_gep");
429
430 Val = Builder.CreateCall(Callee: StackAddrFn, Args: {}, Name: "sp");
431 Builder.CreateStore(Val, Ptr: StackPtr, /*isVolatile=*/true);
432
433 // Call the setup_dispatch intrinsic. It fills in the rest of the jmpbuf.
434 Builder.CreateCall(Callee: BuiltinSetupDispatchFn, Args: {});
435
436 // Store a pointer to the function context so that the back-end will know
437 // where to look for it.
438 Builder.CreateCall(Callee: FuncCtxFn, Args: FuncCtx);
439
440 // At this point, we are all set up, update the invoke instructions to mark
441 // their call_site values.
442 for (unsigned I = 0, E = Invokes.size(); I != E; ++I) {
443 insertCallSiteStore(I: Invokes[I], Number: I + 1);
444
445 ConstantInt *CallSiteNum =
446 ConstantInt::get(Ty: Type::getInt32Ty(C&: F.getContext()), V: I + 1);
447
448 // Record the call site value for the back end so it stays associated with
449 // the invoke.
450 CallInst::Create(Func: CallSiteFn, Args: CallSiteNum, NameStr: "", InsertBefore: Invokes[I]);
451 }
452
453 // Mark call instructions that aren't nounwind as no-action (call_site ==
454 // -1). Skip the entry block, as prior to then, no function context has been
455 // created for this function and any unexpected exceptions thrown will go
456 // directly to the caller's context, which is what we want anyway, so no need
457 // to do anything here.
458 for (BasicBlock &BB : F) {
459 if (&BB == &F.front())
460 continue;
461 for (Instruction &I : BB)
462 if (I.mayThrow())
463 insertCallSiteStore(I: &I, Number: -1);
464 }
465
466 // Register the function context and make sure it's known to not throw
467 CallInst *Register =
468 CallInst::Create(Func: RegisterFn, Args: FuncCtx, NameStr: "", InsertBefore: EntryBB->getTerminator());
469 Register->setDoesNotThrow();
470
471 // Following any allocas not in the entry block, update the saved SP in the
472 // jmpbuf to the new value.
473 for (BasicBlock &BB : F) {
474 if (&BB == &F.front())
475 continue;
476 for (Instruction &I : BB) {
477 if (auto *CI = dyn_cast<CallInst>(Val: &I)) {
478 if (CI->getCalledFunction() != StackRestoreFn)
479 continue;
480 } else if (!isa<AllocaInst>(Val: &I)) {
481 continue;
482 }
483 Instruction *StackAddr = CallInst::Create(Func: StackAddrFn, NameStr: "sp");
484 StackAddr->insertAfter(InsertPos: &I);
485 new StoreInst(StackAddr, StackPtr, true, StackAddr->getNextNode());
486 }
487 }
488
489 // Finally, for any returns from this function, if this function contains an
490 // invoke, add a call to unregister the function context.
491 for (ReturnInst *Return : Returns) {
492 Instruction *InsertPoint = Return;
493 if (CallInst *CI = Return->getParent()->getTerminatingMustTailCall())
494 InsertPoint = CI;
495 CallInst::Create(Func: UnregisterFn, Args: FuncCtx, NameStr: "", InsertBefore: InsertPoint);
496 }
497
498 return true;
499}
500
501bool SjLjEHPrepareImpl::runOnFunction(Function &F) {
502 Module &M = *F.getParent();
503 RegisterFn = M.getOrInsertFunction(
504 Name: "_Unwind_SjLj_Register", RetTy: Type::getVoidTy(C&: M.getContext()),
505 Args: PointerType::getUnqual(ElementType: FunctionContextTy));
506 UnregisterFn = M.getOrInsertFunction(
507 Name: "_Unwind_SjLj_Unregister", RetTy: Type::getVoidTy(C&: M.getContext()),
508 Args: PointerType::getUnqual(ElementType: FunctionContextTy));
509
510 PointerType *AllocaPtrTy = M.getDataLayout().getAllocaPtrType(Ctx&: M.getContext());
511
512 FrameAddrFn =
513 Intrinsic::getDeclaration(M: &M, Intrinsic::id: frameaddress, Tys: {AllocaPtrTy});
514 StackAddrFn =
515 Intrinsic::getDeclaration(M: &M, Intrinsic::id: stacksave, Tys: {AllocaPtrTy});
516 StackRestoreFn =
517 Intrinsic::getDeclaration(M: &M, Intrinsic::id: stackrestore, Tys: {AllocaPtrTy});
518 BuiltinSetupDispatchFn =
519 Intrinsic::getDeclaration(M: &M, Intrinsic::id: eh_sjlj_setup_dispatch);
520 LSDAAddrFn = Intrinsic::getDeclaration(M: &M, Intrinsic::id: eh_sjlj_lsda);
521 CallSiteFn = Intrinsic::getDeclaration(M: &M, Intrinsic::id: eh_sjlj_callsite);
522 FuncCtxFn = Intrinsic::getDeclaration(M: &M, Intrinsic::id: eh_sjlj_functioncontext);
523
524 bool Res = setupEntryBlockAndCallSites(F);
525 return Res;
526}
527

source code of llvm/lib/CodeGen/SjLjEHPrepare.cpp