clang 10.0.0git

CGCoroutine.cpp
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1 //===----- CGCoroutine.cpp - Emit LLVM Code for C++ coroutines ------------===//
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 contains code dealing with C++ code generation of coroutines.
10 //
11 //===----------------------------------------------------------------------===//
12
13 #include "CGCleanup.h"
14 #include "CodeGenFunction.h"
15 #include "llvm/ADT/ScopeExit.h"
16 #include "clang/AST/StmtCXX.h"
17 #include "clang/AST/StmtVisitor.h"
18
19 using namespace clang;
20 using namespace CodeGen;
21
22 using llvm::Value;
23 using llvm::BasicBlock;
24
25 namespace {
26 enum class AwaitKind { Init, Normal, Yield, Final };
27 static constexpr llvm::StringLiteral AwaitKindStr[] = {"init", "await", "yield",
28 "final"};
29 }
30
31 struct clang::CodeGen::CGCoroData {
32 // What is the current await expression kind and how many
33 // await/yield expressions were encountered so far.
34 // These are used to generate pretty labels for await expressions in LLVM IR.
35 AwaitKind CurrentAwaitKind = AwaitKind::Init;
36 unsigned AwaitNum = 0;
37 unsigned YieldNum = 0;
38
39 // How many co_return statements are in the coroutine. Used to decide whether
40 // we need to add co_return; equivalent at the end of the user authored body.
41 unsigned CoreturnCount = 0;
42
43 // A branch to this block is emitted when coroutine needs to suspend.
44 llvm::BasicBlock *SuspendBB = nullptr;
45
46 // The promise type's 'unhandled_exception' handler, if it defines one.
47 Stmt *ExceptionHandler = nullptr;
48
49 // A temporary i1 alloca that stores whether 'await_resume' threw an
50 // exception. If it did, 'true' is stored in this variable, and the coroutine
51 // body must be skipped. If the promise type does not define an exception
52 // handler, this is null.
53 llvm::Value *ResumeEHVar = nullptr;
54
55 // Stores the jump destination just before the coroutine memory is freed.
56 // This is the destination that every suspend point jumps to for the cleanup
57 // branch.
58 CodeGenFunction::JumpDest CleanupJD;
59
60 // Stores the jump destination just before the final suspend. The co_return
61 // statements jumps to this point after calling return_xxx promise member.
62 CodeGenFunction::JumpDest FinalJD;
63
64 // Stores the llvm.coro.id emitted in the function so that we can supply it
65 // as the first argument to coro.begin, coro.alloc and coro.free intrinsics.
66 // Note: llvm.coro.id returns a token that cannot be directly expressed in a
67 // builtin.
68 llvm::CallInst *CoroId = nullptr;
69
70 // Stores the llvm.coro.begin emitted in the function so that we can replace
71 // all coro.frame intrinsics with direct SSA value of coro.begin that returns
72 // the address of the coroutine frame of the current coroutine.
73 llvm::CallInst *CoroBegin = nullptr;
74
75 // Stores the last emitted coro.free for the deallocate expressions, we use it
76 // to wrap dealloc code with if(auto mem = coro.free) dealloc(mem).
77 llvm::CallInst *LastCoroFree = nullptr;
78
79 // If coro.id came from the builtin, remember the expression to give better
80 // diagnostic. If CoroIdExpr is nullptr, the coro.id was created by
81 // EmitCoroutineBody.
82 CallExpr const *CoroIdExpr = nullptr;
83 };
84
85 // Defining these here allows to keep CGCoroData private to this file.
86 clang::CodeGen::CodeGenFunction::CGCoroInfo::CGCoroInfo() {}
87 CodeGenFunction::CGCoroInfo::~CGCoroInfo() {}
88
89 static void createCoroData(CodeGenFunction &CGF,
90 CodeGenFunction::CGCoroInfo &CurCoro,
91 llvm::CallInst *CoroId,
92 CallExpr const *CoroIdExpr = nullptr) {
93 if (CurCoro.Data) {
94 if (CurCoro.Data->CoroIdExpr)
95 CGF.CGM.Error(CoroIdExpr->getBeginLoc(),
96 "only one __builtin_coro_id can be used in a function");
97 else if (CoroIdExpr)
98 CGF.CGM.Error(CoroIdExpr->getBeginLoc(),
99 "__builtin_coro_id shall not be used in a C++ coroutine");
100 else
101 llvm_unreachable("EmitCoroutineBodyStatement called twice?");
102
103 return;
104 }
105
106 CurCoro.Data = std::unique_ptr<CGCoroData>(new CGCoroData);
107 CurCoro.Data->CoroId = CoroId;
108 CurCoro.Data->CoroIdExpr = CoroIdExpr;
109 }
110
111 // Synthesize a pretty name for a suspend point.
112 static SmallString<32> buildSuspendPrefixStr(CGCoroData &Coro, AwaitKind Kind) {
113 unsigned No = 0;
114 switch (Kind) {
115 case AwaitKind::Init:
116 case AwaitKind::Final:
117 break;
118 case AwaitKind::Normal:
119 No = ++Coro.AwaitNum;
120 break;
121 case AwaitKind::Yield:
122 No = ++Coro.YieldNum;
123 break;
124 }
125 SmallString<32> Prefix(AwaitKindStr[static_cast<unsigned>(Kind)]);
126 if (No > 1) {
127 Twine(No).toVector(Prefix);
128 }
129 return Prefix;
130 }
131
132 static bool memberCallExpressionCanThrow(const Expr *E) {
133 if (const auto *CE = dyn_cast<CXXMemberCallExpr>(E))
134 if (const auto *Proto =
135 CE->getMethodDecl()->getType()->getAs<FunctionProtoType>())
136 if (isNoexceptExceptionSpec(Proto->getExceptionSpecType()) &&
137 Proto->canThrow() == CT_Cannot)
138 return false;
139 return true;
140 }
141
142 // Emit suspend expression which roughly looks like:
143 //
144 // auto && x = CommonExpr();
145 // if (!x.await_ready()) {
146 // llvm_coro_save();
147 // x.await_suspend(...); (*)
148 // llvm_coro_suspend(); (**)
149 // }
150 // x.await_resume();
151 //
152 // where the result of the entire expression is the result of x.await_resume()
153 //
154 // (*) If x.await_suspend return type is bool, it allows to veto a suspend:
155 // if (x.await_suspend(...))
156 // llvm_coro_suspend();
157 //
158 // (**) llvm_coro_suspend() encodes three possible continuations as
159 // a switch instruction:
160 //
161 // %where-to = call i8 @llvm.coro.suspend(...)
162 // switch i8 %where-to, label %coro.ret [ ; jump to epilogue to suspend
163 // i8 0, label %yield.ready ; go here when resumed
164 // i8 1, label %yield.cleanup ; go here when destroyed
165 // ]
166 //
167 // See llvm's docs/Coroutines.rst for more details.
168 //
169 namespace {
170 struct LValueOrRValue {
171 LValue LV;
172 RValue RV;
173 };
174 }
175 static LValueOrRValue emitSuspendExpression(CodeGenFunction &CGF, CGCoroData &Coro,
176 CoroutineSuspendExpr const &S,
177 AwaitKind Kind, AggValueSlot aggSlot,
178 bool ignoreResult, bool forLValue) {
179 auto *E = S.getCommonExpr();
180
181 auto Binder =
182 CodeGenFunction::OpaqueValueMappingData::bind(CGF, S.getOpaqueValue(), E);
183 auto UnbindOnExit = llvm::make_scope_exit([&] { Binder.unbind(CGF); });
184
185 auto Prefix = buildSuspendPrefixStr(Coro, Kind);
186 BasicBlock *ReadyBlock = CGF.createBasicBlock(Prefix + Twine(".ready"));
187 BasicBlock *SuspendBlock = CGF.createBasicBlock(Prefix + Twine(".suspend"));
188 BasicBlock *CleanupBlock = CGF.createBasicBlock(Prefix + Twine(".cleanup"));
189
190 // If expression is ready, no need to suspend.
191 CGF.EmitBranchOnBoolExpr(S.getReadyExpr(), ReadyBlock, SuspendBlock, 0);
192
193 // Otherwise, emit suspend logic.
194 CGF.EmitBlock(SuspendBlock);
195
196 auto &Builder = CGF.Builder;
197 llvm::Function *CoroSave = CGF.CGM.getIntrinsic(llvm::Intrinsic::coro_save);
198 auto *NullPtr = llvm::ConstantPointerNull::get(CGF.CGM.Int8PtrTy);
199 auto *SaveCall = Builder.CreateCall(CoroSave, {NullPtr});
200
201 auto *SuspendRet = CGF.EmitScalarExpr(S.getSuspendExpr());
202 if (SuspendRet != nullptr && SuspendRet->getType()->isIntegerTy(1)) {
203 // Veto suspension if requested by bool returning await_suspend.
204 BasicBlock *RealSuspendBlock =
205 CGF.createBasicBlock(Prefix + Twine(".suspend.bool"));
206 CGF.Builder.CreateCondBr(SuspendRet, RealSuspendBlock, ReadyBlock);
207 CGF.EmitBlock(RealSuspendBlock);
208 }
209
210 // Emit the suspend point.
211 const bool IsFinalSuspend = (Kind == AwaitKind::Final);
212 llvm::Function *CoroSuspend =
213 CGF.CGM.getIntrinsic(llvm::Intrinsic::coro_suspend);
214 auto *SuspendResult = Builder.CreateCall(
215 CoroSuspend, {SaveCall, Builder.getInt1(IsFinalSuspend)});
216
217 // Create a switch capturing three possible continuations.
218 auto *Switch = Builder.CreateSwitch(SuspendResult, Coro.SuspendBB, 2);
219 Switch->addCase(Builder.getInt8(0), ReadyBlock);
220 Switch->addCase(Builder.getInt8(1), CleanupBlock);
221
222 // Emit cleanup for this suspend point.
223 CGF.EmitBlock(CleanupBlock);
224 CGF.EmitBranchThroughCleanup(Coro.CleanupJD);
225
226 // Emit await_resume expression.
227 CGF.EmitBlock(ReadyBlock);
228
229 // Exception handling requires additional IR. If the 'await_resume' function
230 // is marked as 'noexcept', we avoid generating this additional IR.
231 CXXTryStmt *TryStmt = nullptr;
232 if (Coro.ExceptionHandler && Kind == AwaitKind::Init &&
233 memberCallExpressionCanThrow(S.getResumeExpr())) {
234 Coro.ResumeEHVar =
235 CGF.CreateTempAlloca(Builder.getInt1Ty(), Prefix + Twine("resume.eh"));
236 Builder.CreateFlagStore(true, Coro.ResumeEHVar);
237
238 auto Loc = S.getResumeExpr()->getExprLoc();
239 auto *Catch = new (CGF.getContext())
240 CXXCatchStmt(Loc, /*exDecl=*/nullptr, Coro.ExceptionHandler);
241 auto *TryBody =
242 CompoundStmt::Create(CGF.getContext(), S.getResumeExpr(), Loc, Loc);
243 TryStmt = CXXTryStmt::Create(CGF.getContext(), Loc, TryBody, Catch);
244 CGF.EnterCXXTryStmt(*TryStmt);
245 }
246
247 LValueOrRValue Res;
248 if (forLValue)
249 Res.LV = CGF.EmitLValue(S.getResumeExpr());
250 else
251 Res.RV = CGF.EmitAnyExpr(S.getResumeExpr(), aggSlot, ignoreResult);
252
253 if (TryStmt) {
254 Builder.CreateFlagStore(false, Coro.ResumeEHVar);
255 CGF.ExitCXXTryStmt(*TryStmt);
256 }
257
258 return Res;
259 }
260
261 RValue CodeGenFunction::EmitCoawaitExpr(const CoawaitExpr &E,
262 AggValueSlot aggSlot,
263 bool ignoreResult) {
264 return emitSuspendExpression(*this, *CurCoro.Data, E,
265 CurCoro.Data->CurrentAwaitKind, aggSlot,
266 ignoreResult, /*forLValue*/false).RV;
267 }
268 RValue CodeGenFunction::EmitCoyieldExpr(const CoyieldExpr &E,
269 AggValueSlot aggSlot,
270 bool ignoreResult) {
271 return emitSuspendExpression(*this, *CurCoro.Data, E, AwaitKind::Yield,
272 aggSlot, ignoreResult, /*forLValue*/false).RV;
273 }
274
275 void CodeGenFunction::EmitCoreturnStmt(CoreturnStmt const &S) {
276 ++CurCoro.Data->CoreturnCount;
277 const Expr *RV = S.getOperand();
278 if (RV && RV->getType()->isVoidType()) {
279 // Make sure to evaluate the expression of a co_return with a void
280 // expression for side effects.
281 RunCleanupsScope cleanupScope(*this);
282 EmitIgnoredExpr(RV);
283 }
284 EmitStmt(S.getPromiseCall());
285 EmitBranchThroughCleanup(CurCoro.Data->FinalJD);
286 }
287
288
289 #ifndef NDEBUG
290 static QualType getCoroutineSuspendExprReturnType(const ASTContext &Ctx,
291 const CoroutineSuspendExpr *E) {
292 const auto *RE = E->getResumeExpr();
293 // Is it possible for RE to be a CXXBindTemporaryExpr wrapping
294 // a MemberCallExpr?
295 assert(isa<CallExpr>(RE) && "unexpected suspend expression type");
296 return cast<CallExpr>(RE)->getCallReturnType(Ctx);
297 }
298 #endif
299
300 LValue
301 CodeGenFunction::EmitCoawaitLValue(const CoawaitExpr *E) {
302 assert(getCoroutineSuspendExprReturnType(getContext(), E)->isReferenceType() &&
303 "Can't have a scalar return unless the return type is a "
304 "reference type!");
305 return emitSuspendExpression(*this, *CurCoro.Data, *E,
306 CurCoro.Data->CurrentAwaitKind, AggValueSlot::ignored(),
307 /*ignoreResult*/false, /*forLValue*/true).LV;
308 }
309
310 LValue
311 CodeGenFunction::EmitCoyieldLValue(const CoyieldExpr *E) {
312 assert(getCoroutineSuspendExprReturnType(getContext(), E)->isReferenceType() &&
313 "Can't have a scalar return unless the return type is a "
314 "reference type!");
315 return emitSuspendExpression(*this, *CurCoro.Data, *E,
316 AwaitKind::Yield, AggValueSlot::ignored(),
317 /*ignoreResult*/false, /*forLValue*/true).LV;
318 }
319
320 // Hunts for the parameter reference in the parameter copy/move declaration.
321 namespace {
322 struct GetParamRef : public StmtVisitor<GetParamRef> {
323 public:
324 DeclRefExpr *Expr = nullptr;
325 GetParamRef() {}
326 void VisitDeclRefExpr(DeclRefExpr *E) {
327 assert(Expr == nullptr && "multilple declref in param move");
328 Expr = E;
329 }
330 void VisitStmt(Stmt *S) {
331 for (auto *C : S->children()) {
332 if (C)
333 Visit(C);
334 }
335 }
336 };
337 }
338
339 // This class replaces references to parameters to their copies by changing
340 // the addresses in CGF.LocalDeclMap and restoring back the original values in
341 // its destructor.
342
343 namespace {
344 struct ParamReferenceReplacerRAII {
345 CodeGenFunction::DeclMapTy SavedLocals;
346 CodeGenFunction::DeclMapTy& LocalDeclMap;
347
348 ParamReferenceReplacerRAII(CodeGenFunction::DeclMapTy &LocalDeclMap)
349 : LocalDeclMap(LocalDeclMap) {}
350
351 void addCopy(DeclStmt const *PM) {
352 // Figure out what param it refers to.
353
354 assert(PM->isSingleDecl());
355 VarDecl const*VD = static_cast<VarDecl const*>(PM->getSingleDecl());
356 Expr const *InitExpr = VD->getInit();
357 GetParamRef Visitor;
358 Visitor.Visit(const_cast<Expr*>(InitExpr));
359 assert(Visitor.Expr);
360 DeclRefExpr *DREOrig = Visitor.Expr;
361 auto *PD = DREOrig->getDecl();
362
363 auto it = LocalDeclMap.find(PD);
364 assert(it != LocalDeclMap.end() && "parameter is not found");
365 SavedLocals.insert({ PD, it->second });
366
367 auto copyIt = LocalDeclMap.find(VD);
368 assert(copyIt != LocalDeclMap.end() && "parameter copy is not found");
369 it->second = copyIt->getSecond();
370 }
371
372 ~ParamReferenceReplacerRAII() {
373 for (auto&& SavedLocal : SavedLocals) {
374 LocalDeclMap.insert({SavedLocal.first, SavedLocal.second});
375 }
376 }
377 };
378 }
379
380 // For WinEH exception representation backend needs to know what funclet coro.end
381 // belongs to. That information is passed in a funclet bundle.
382 static SmallVector<llvm::OperandBundleDef, 1>
383 getBundlesForCoroEnd(CodeGenFunction &CGF) {
384 SmallVector<llvm::OperandBundleDef, 1> BundleList;
385
386 if (llvm::Instruction *EHPad = CGF.CurrentFuncletPad)
387 BundleList.emplace_back("funclet", EHPad);
388
389 return BundleList;
390 }
391
392 namespace {
393 // We will insert coro.end to cut any of the destructors for objects that
394 // do not need to be destroyed once the coroutine is resumed.
395 // See llvm/docs/Coroutines.rst for more details about coro.end.
396 struct CallCoroEnd final : public EHScopeStack::Cleanup {
397 void Emit(CodeGenFunction &CGF, Flags flags) override {
398 auto &CGM = CGF.CGM;
399 auto *NullPtr = llvm::ConstantPointerNull::get(CGF.Int8PtrTy);
400 llvm::Function *CoroEndFn = CGM.getIntrinsic(llvm::Intrinsic::coro_end);
401 // See if we have a funclet bundle to associate coro.end with. (WinEH)
402 auto Bundles = getBundlesForCoroEnd(CGF);
403 auto *CoroEnd = CGF.Builder.CreateCall(
404 CoroEndFn, {NullPtr, CGF.Builder.getTrue()}, Bundles);
405 if (Bundles.empty()) {
406 // Otherwise, (landingpad model), create a conditional branch that leads
407 // either to a cleanup block or a block with EH resume instruction.
408 auto *ResumeBB = CGF.getEHResumeBlock(/*isCleanup=*/true);
409 auto *CleanupContBB = CGF.createBasicBlock("cleanup.cont");
410 CGF.Builder.CreateCondBr(CoroEnd, ResumeBB, CleanupContBB);
411 CGF.EmitBlock(CleanupContBB);
412 }
413 }
414 };
415 }
416
417 namespace {
418 // Make sure to call coro.delete on scope exit.
419 struct CallCoroDelete final : public EHScopeStack::Cleanup {
420 Stmt *Deallocate;
421
422 // Emit "if (coro.free(CoroId, CoroBegin)) Deallocate;"
423
424 // Note: That deallocation will be emitted twice: once for a normal exit and
425 // once for exceptional exit. This usage is safe because Deallocate does not
426 // contain any declarations. The SubStmtBuilder::makeNewAndDeleteExpr()
427 // builds a single call to a deallocation function which is safe to emit
428 // multiple times.
429 void Emit(CodeGenFunction &CGF, Flags) override {
430 // Remember the current point, as we are going to emit deallocation code
431 // first to get to coro.free instruction that is an argument to a delete
432 // call.
433 BasicBlock *SaveInsertBlock = CGF.Builder.GetInsertBlock();
434
435 auto *FreeBB = CGF.createBasicBlock("coro.free");
436 CGF.EmitBlock(FreeBB);
437 CGF.EmitStmt(Deallocate);
438
439 auto *AfterFreeBB = CGF.createBasicBlock("after.coro.free");
440 CGF.EmitBlock(AfterFreeBB);
441
442 // We should have captured coro.free from the emission of deallocate.
443 auto *CoroFree = CGF.CurCoro.Data->LastCoroFree;
444 if (!CoroFree) {
445 CGF.CGM.Error(Deallocate->getBeginLoc(),
446 "Deallocation expressoin does not refer to coro.free");
447 return;
448 }
449
450 // Get back to the block we were originally and move coro.free there.
451 auto *InsertPt = SaveInsertBlock->getTerminator();
452 CoroFree->moveBefore(InsertPt);
453 CGF.Builder.SetInsertPoint(InsertPt);
454
455 // Add if (auto *mem = coro.free) Deallocate;
456 auto *NullPtr = llvm::ConstantPointerNull::get(CGF.Int8PtrTy);
457 auto *Cond = CGF.Builder.CreateICmpNE(CoroFree, NullPtr);
458 CGF.Builder.CreateCondBr(Cond, FreeBB, AfterFreeBB);
459
460 // No longer need old terminator.
461 InsertPt->eraseFromParent();
462 CGF.Builder.SetInsertPoint(AfterFreeBB);
463 }
464 explicit CallCoroDelete(Stmt *DeallocStmt) : Deallocate(DeallocStmt) {}
465 };
466 }
467
468 namespace {
469 struct GetReturnObjectManager {
470 CodeGenFunction &CGF;
471 CGBuilderTy &Builder;
472 const CoroutineBodyStmt &S;
473
474 Address GroActiveFlag;
475 CodeGenFunction::AutoVarEmission GroEmission;
476
477 GetReturnObjectManager(CodeGenFunction &CGF, const CoroutineBodyStmt &S)
478 : CGF(CGF), Builder(CGF.Builder), S(S), GroActiveFlag(Address::invalid()),
479 GroEmission(CodeGenFunction::AutoVarEmission::invalid()) {}
480
481 // The gro variable has to outlive coroutine frame and coroutine promise, but,
482 // it can only be initialized after coroutine promise was created, thus, we
483 // split its emission in two parts. EmitGroAlloca emits an alloca and sets up
484 // cleanups. Later when coroutine promise is available we initialize the gro
485 // and sets the flag that the cleanup is now active.
486
487 void EmitGroAlloca() {
488 auto *GroDeclStmt = dyn_cast<DeclStmt>(S.getResultDecl());
489 if (!GroDeclStmt) {
490 // If get_return_object returns void, no need to do an alloca.
491 return;
492 }
493
494 auto *GroVarDecl = cast<VarDecl>(GroDeclStmt->getSingleDecl());
495
496 // Set GRO flag that it is not initialized yet
497 GroActiveFlag =
498 CGF.CreateTempAlloca(Builder.getInt1Ty(), CharUnits::One(), "gro.active");
499 Builder.CreateStore(Builder.getFalse(), GroActiveFlag);
500
501 GroEmission = CGF.EmitAutoVarAlloca(*GroVarDecl);
502
503 // Remember the top of EHStack before emitting the cleanup.
504 auto old_top = CGF.EHStack.stable_begin();
505 CGF.EmitAutoVarCleanups(GroEmission);
506 auto top = CGF.EHStack.stable_begin();
507
508 // Make the cleanup conditional on gro.active
509 for (auto b = CGF.EHStack.find(top), e = CGF.EHStack.find(old_top);
510 b != e; b++) {
511 if (auto *Cleanup = dyn_cast<EHCleanupScope>(&*b)) {
512 assert(!Cleanup->hasActiveFlag() && "cleanup already has active flag?");
513 Cleanup->setActiveFlag(GroActiveFlag);
514 Cleanup->setTestFlagInEHCleanup();
515 Cleanup->setTestFlagInNormalCleanup();
516 }
517 }
518 }
519
520 void EmitGroInit() {
521 if (!GroActiveFlag.isValid()) {
522 // No Gro variable was allocated. Simply emit the call to
523 // get_return_object.
524 CGF.EmitStmt(S.getResultDecl());
525 return;
526 }
527
528 CGF.EmitAutoVarInit(GroEmission);
529 Builder.CreateStore(Builder.getTrue(), GroActiveFlag);
530 }
531 };
532 }
533
534 static void emitBodyAndFallthrough(CodeGenFunction &CGF,
535 const CoroutineBodyStmt &S, Stmt *Body) {
536 CGF.EmitStmt(Body);
537 const bool CanFallthrough = CGF.Builder.GetInsertBlock();
538 if (CanFallthrough)
539 if (Stmt *OnFallthrough = S.getFallthroughHandler())
540 CGF.EmitStmt(OnFallthrough);
541 }
542
543 void CodeGenFunction::EmitCoroutineBody(const CoroutineBodyStmt &S) {
544 auto *NullPtr = llvm::ConstantPointerNull::get(Builder.getInt8PtrTy());
545 auto &TI = CGM.getContext().getTargetInfo();
546 unsigned NewAlign = TI.getNewAlign() / TI.getCharWidth();
547
548 auto *EntryBB = Builder.GetInsertBlock();
549 auto *AllocBB = createBasicBlock("coro.alloc");
550 auto *InitBB = createBasicBlock("coro.init");
551 auto *FinalBB = createBasicBlock("coro.final");
552 auto *RetBB = createBasicBlock("coro.ret");
553
554 auto *CoroId = Builder.CreateCall(
555 CGM.getIntrinsic(llvm::Intrinsic::coro_id),
556 {Builder.getInt32(NewAlign), NullPtr, NullPtr, NullPtr});
557 createCoroData(*this, CurCoro, CoroId);
558 CurCoro.Data->SuspendBB = RetBB;
559
560 // Backend is allowed to elide memory allocations, to help it, emit
561 // auto mem = coro.alloc() ? 0 : ... allocation code ...;
562 auto *CoroAlloc = Builder.CreateCall(
563 CGM.getIntrinsic(llvm::Intrinsic::coro_alloc), {CoroId});
564
565 Builder.CreateCondBr(CoroAlloc, AllocBB, InitBB);
566
567 EmitBlock(AllocBB);
568 auto *AllocateCall = EmitScalarExpr(S.getAllocate());
569 auto *AllocOrInvokeContBB = Builder.GetInsertBlock();
570
571 // Handle allocation failure if 'ReturnStmtOnAllocFailure' was provided.
572 if (auto *RetOnAllocFailure = S.getReturnStmtOnAllocFailure()) {
573 auto *RetOnFailureBB = createBasicBlock("coro.ret.on.failure");
574
575 // See if allocation was successful.
576 auto *NullPtr = llvm::ConstantPointerNull::get(Int8PtrTy);
577 auto *Cond = Builder.CreateICmpNE(AllocateCall, NullPtr);
578 Builder.CreateCondBr(Cond, InitBB, RetOnFailureBB);
579
580 // If not, return OnAllocFailure object.
581 EmitBlock(RetOnFailureBB);
582 EmitStmt(RetOnAllocFailure);
583 }
584 else {
585 Builder.CreateBr(InitBB);
586 }
587
588 EmitBlock(InitBB);
589
590 // Pass the result of the allocation to coro.begin.
591 auto *Phi = Builder.CreatePHI(VoidPtrTy, 2);
592 Phi->addIncoming(NullPtr, EntryBB);
593 Phi->addIncoming(AllocateCall, AllocOrInvokeContBB);
594 auto *CoroBegin = Builder.CreateCall(
595 CGM.getIntrinsic(llvm::Intrinsic::coro_begin), {CoroId, Phi});
596 CurCoro.Data->CoroBegin = CoroBegin;
597
598 GetReturnObjectManager GroManager(*this, S);
599 GroManager.EmitGroAlloca();
600
601 CurCoro.Data->CleanupJD = getJumpDestInCurrentScope(RetBB);
602 {
603 ParamReferenceReplacerRAII ParamReplacer(LocalDeclMap);
604 CodeGenFunction::RunCleanupsScope ResumeScope(*this);
605 EHStack.pushCleanup<CallCoroDelete>(NormalAndEHCleanup, S.getDeallocate());
606
607 // Create parameter copies. We do it before creating a promise, since an
608 // evolution of coroutine TS may allow promise constructor to observe
609 // parameter copies.
610 for (auto *PM : S.getParamMoves()) {
611 EmitStmt(PM);
612 ParamReplacer.addCopy(cast<DeclStmt>(PM));
613 // TODO: if(CoroParam(...)) need to surround ctor and dtor
614 // for the copy, so that llvm can elide it if the copy is
615 // not needed.
616 }
617
618 EmitStmt(S.getPromiseDeclStmt());
619
620 Address PromiseAddr = GetAddrOfLocalVar(S.getPromiseDecl());
621 auto *PromiseAddrVoidPtr =
622 new llvm::BitCastInst(PromiseAddr.getPointer(), VoidPtrTy, "", CoroId);
623 // Update CoroId to refer to the promise. We could not do it earlier because
624 // promise local variable was not emitted yet.
625 CoroId->setArgOperand(1, PromiseAddrVoidPtr);
626
627 // Now we have the promise, initialize the GRO
628 GroManager.EmitGroInit();
629
630 EHStack.pushCleanup<CallCoroEnd>(EHCleanup);
631
632 CurCoro.Data->CurrentAwaitKind = AwaitKind::Init;
633 CurCoro.Data->ExceptionHandler = S.getExceptionHandler();
634 EmitStmt(S.getInitSuspendStmt());
635 CurCoro.Data->FinalJD = getJumpDestInCurrentScope(FinalBB);
636
637 CurCoro.Data->CurrentAwaitKind = AwaitKind::Normal;
638
639 if (CurCoro.Data->ExceptionHandler) {
640 // If we generated IR to record whether an exception was thrown from
641 // 'await_resume', then use that IR to determine whether the coroutine
642 // body should be skipped.
643 // If we didn't generate the IR (perhaps because 'await_resume' was marked
644 // as 'noexcept'), then we skip this check.
645 BasicBlock *ContBB = nullptr;
646 if (CurCoro.Data->ResumeEHVar) {
647 BasicBlock *BodyBB = createBasicBlock("coro.resumed.body");
648 ContBB = createBasicBlock("coro.resumed.cont");
649 Value *SkipBody = Builder.CreateFlagLoad(CurCoro.Data->ResumeEHVar,
650 "coro.resumed.eh");
651 Builder.CreateCondBr(SkipBody, ContBB, BodyBB);
652 EmitBlock(BodyBB);
653 }
654
655 auto Loc = S.getBeginLoc();
656 CXXCatchStmt Catch(Loc, /*exDecl=*/nullptr,
657 CurCoro.Data->ExceptionHandler);
658 auto *TryStmt =
659 CXXTryStmt::Create(getContext(), Loc, S.getBody(), &Catch);
660
661 EnterCXXTryStmt(*TryStmt);
662 emitBodyAndFallthrough(*this, S, TryStmt->getTryBlock());
663 ExitCXXTryStmt(*TryStmt);
664
665 if (ContBB)
666 EmitBlock(ContBB);
667 }
668 else {
669 emitBodyAndFallthrough(*this, S, S.getBody());
670 }
671
672 // See if we need to generate final suspend.
673 const bool CanFallthrough = Builder.GetInsertBlock();
674 const bool HasCoreturns = CurCoro.Data->CoreturnCount > 0;
675 if (CanFallthrough || HasCoreturns) {
676 EmitBlock(FinalBB);
677 CurCoro.Data->CurrentAwaitKind = AwaitKind::Final;
678 EmitStmt(S.getFinalSuspendStmt());
679 } else {
680 // We don't need FinalBB. Emit it to make sure the block is deleted.
681 EmitBlock(FinalBB, /*IsFinished=*/true);
682 }
683 }
684
685 EmitBlock(RetBB);
686 // Emit coro.end before getReturnStmt (and parameter destructors), since
687 // resume and destroy parts of the coroutine should not include them.
688 llvm::Function *CoroEnd = CGM.getIntrinsic(llvm::Intrinsic::coro_end);
689 Builder.CreateCall(CoroEnd, {NullPtr, Builder.getFalse()});
690
691 if (Stmt *Ret = S.getReturnStmt())
692 EmitStmt(Ret);
693 }
694
695 // Emit coroutine intrinsic and patch up arguments of the token type.
696 RValue CodeGenFunction::EmitCoroutineIntrinsic(const CallExpr *E,
697 unsigned int IID) {
698 SmallVector<llvm::Value *, 8> Args;
699 switch (IID) {
700 default:
701 break;
702 // The coro.frame builtin is replaced with an SSA value of the coro.begin
703 // intrinsic.
704 case llvm::Intrinsic::coro_frame: {
705 if (CurCoro.Data && CurCoro.Data->CoroBegin) {
706 return RValue::get(CurCoro.Data->CoroBegin);
707 }
708 CGM.Error(E->getBeginLoc(), "this builtin expect that __builtin_coro_begin "
709 "has been used earlier in this function");
710 auto NullPtr = llvm::ConstantPointerNull::get(Builder.getInt8PtrTy());
711 return RValue::get(NullPtr);
712 }
713 // The following three intrinsics take a token parameter referring to a token
714 // returned by earlier call to @llvm.coro.id. Since we cannot represent it in
715 // builtins, we patch it up here.
716 case llvm::Intrinsic::coro_alloc:
717 case llvm::Intrinsic::coro_begin:
718 case llvm::Intrinsic::coro_free: {
719 if (CurCoro.Data && CurCoro.Data->CoroId) {
720 Args.push_back(CurCoro.Data->CoroId);
721 break;
722 }
723 CGM.Error(E->getBeginLoc(), "this builtin expect that __builtin_coro_id has"
724 " been used earlier in this function");
725 // Fallthrough to the next case to add TokenNone as the first argument.
726 LLVM_FALLTHROUGH;
727 }
728 // @llvm.coro.suspend takes a token parameter. Add token 'none' as the first
729 // argument.
730 case llvm::Intrinsic::coro_suspend:
731 Args.push_back(llvm::ConstantTokenNone::get(getLLVMContext()));
732 break;
733 }
734 for (const Expr *Arg : E->arguments())
735 Args.push_back(EmitScalarExpr(Arg));
736
737 llvm::Function *F = CGM.getIntrinsic(IID);
738 llvm::CallInst *Call = Builder.CreateCall(F, Args);
739
740 // Note: The following code is to enable to emit coro.id and coro.begin by
741 // hand to experiment with coroutines in C.
742 // If we see @llvm.coro.id remember it in the CoroData. We will update
743 // coro.alloc, coro.begin and coro.free intrinsics to refer to it.
744 if (IID == llvm::Intrinsic::coro_id) {
745 createCoroData(*this, CurCoro, Call, E);
746 }
747 else if (IID == llvm::Intrinsic::coro_begin) {
748 if (CurCoro.Data)
749 CurCoro.Data->CoroBegin = Call;
750 }
751 else if (IID == llvm::Intrinsic::coro_free) {
752 // Remember the last coro_free as we need it to build the conditional
753 // deletion of the coroutine frame.
754 if (CurCoro.Data)
755 CurCoro.Data->LastCoroFree = Call;
756 }
757 return RValue::get(Call);
758 }
clang::CoroutineSuspendExpr::getReadyExpr
Expr * getReadyExpr() const
Definition: ExprCXX.h:4666
clang::CodeGen::CodeGenFunction::EmitCoroutineBody
void EmitCoroutineBody(const CoroutineBodyStmt &S)
Definition: CGCoroutine.cpp:543
clang::OverloadCandidateParamOrder::Normal
clang::QualType
A (possibly-)qualified type.
Definition: Type.h:654
clang::CodeGen::CodeGenFunction::EmitBranchOnBoolExpr
void EmitBranchOnBoolExpr(const Expr *Cond, llvm::BasicBlock *TrueBlock, llvm::BasicBlock *FalseBlock, uint64_t TrueCount)
EmitBranchOnBoolExpr - Emit a branch on a boolean condition (e.g.
Definition: CodeGenFunction.cpp:1470
clang::CodeGen::CodeGenFunction::EmitCoyieldExpr
RValue EmitCoyieldExpr(const CoyieldExpr &E, AggValueSlot aggSlot=AggValueSlot::ignored(), bool ignoreResult=false)
Definition: CGCoroutine.cpp:268
clang::CodeGen::CodeGenFunction::CGCoroInfo
Definition: CodeGenFunction.h:306
clang::CoreturnStmt
Represents a &#39;co_return&#39; statement in the C++ Coroutines TS.
Definition: StmtCXX.h:456
clang::Stmt
Stmt - This represents one statement.
Definition: Stmt.h:66
memberCallExpressionCanThrow
static bool memberCallExpressionCanThrow(const Expr *E)
Definition: CGCoroutine.cpp:132
clang::CodeGen::CodeGenFunction::EmitCoawaitExpr
RValue EmitCoawaitExpr(const CoawaitExpr &E, AggValueSlot aggSlot=AggValueSlot::ignored(), bool ignoreResult=false)
Definition: CGCoroutine.cpp:261
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Stmt * getPromiseDeclStmt() const
Definition: StmtCXX.h:382
clang::CodeGen::EHScopeStack::find
iterator find(stable_iterator save) const
Turn a stable reference to a scope depth into a unstable pointer to the EH stack. ...
Definition: CGCleanup.h:590
clang::CodeGen::EHScopeStack::stable_begin
stable_iterator stable_begin() const
Create a stable reference to the top of the EH stack.
Definition: EHScopeStack.h:378
Value
Value
Definition: UninitializedValues.cpp:101
clang::CoroutineBodyStmt::getExceptionHandler
Stmt * getExceptionHandler() const
Definition: StmtCXX.h:396
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Expr * getDeallocate() const
Definition: StmtCXX.h:406
clang::VarDecl
Represents a variable declaration or definition.
Definition: Decl.h:820
clang::CoroutineBodyStmt::getResultDecl
Stmt * getResultDecl() const
Definition: StmtCXX.h:412
clang::CodeGen::CodeGenFunction::JumpDest
A jump destination is an abstract label, branching to which may require a jump out through normal cle...
Definition: CodeGenFunction.h:235
clang::isNoexceptExceptionSpec
bool isNoexceptExceptionSpec(ExceptionSpecificationType ESpecType)
Definition: ExceptionSpecificationType.h:44
clang::CodeGen::CodeGenFunction
CodeGenFunction - This class organizes the per-function state that is used while generating LLVM code...
Definition: CodeGenFunction.h:227
clang::ASTContext
Holds long-lived AST nodes (such as types and decls) that can be referred to throughout the semantic ...
Definition: ASTContext.h:168
clang::CoroutineBodyStmt::getPromiseDecl
VarDecl * getPromiseDecl() const
Definition: StmtCXX.h:385
clang::CodeGen::CodeGenFunction::EmitCoyieldLValue
LValue EmitCoyieldLValue(const CoyieldExpr *E)
Definition: CGCoroutine.cpp:311
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Denotes a cleanup that should run when a scope is exited using exceptional control flow (a throw stat...
Definition: EHScopeStack.h:80
clang::CodeGen::CodeGenFunction::Builder
CGBuilderTy Builder
Definition: CodeGenFunction.h:263
StmtCXX.h
clang::CodeGen::CodeGenFunction::EmitAnyExpr
RValue EmitAnyExpr(const Expr *E, AggValueSlot aggSlot=AggValueSlot::ignored(), bool ignoreResult=false)
EmitAnyExpr - Emit code to compute the specified expression which can have any type.
Definition: CGExpr.cpp:194
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ArrayRef< Stmt const * > getParamMoves() const
Definition: StmtCXX.h:417
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child_range children()
Definition: Stmt.cpp:224
clang::CompoundStmt::Create
static CompoundStmt * Create(const ASTContext &C, ArrayRef< Stmt *> Stmts, SourceLocation LB, SourceLocation RB)
Definition: Stmt.cpp:319
clang::CodeGen::CodeGenFunction::createBasicBlock
llvm::BasicBlock * createBasicBlock(const Twine &name="", llvm::Function *parent=nullptr, llvm::BasicBlock *before=nullptr)
createBasicBlock - Create an LLVM basic block.
Definition: CodeGenFunction.h:2071
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OpaqueValueExpr * getOpaqueValue() const
getOpaqueValue - Return the opaque value placeholder.
Definition: ExprCXX.h:4664
clang::CoroutineSuspendExpr::getCommonExpr
Expr * getCommonExpr() const
Definition: ExprCXX.h:4659
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CGCoroInfo()
Definition: CGCoroutine.cpp:86
clang::CodeGen::CodeGenFunction::CreateTempAlloca
llvm::AllocaInst * CreateTempAlloca(llvm::Type *Ty, const Twine &Name="tmp", llvm::Value *ArraySize=nullptr)
CreateTempAlloca - This creates an alloca and inserts it into the entry block if ArraySize is nullptr...
Definition: CGExpr.cpp:106
llvm::SmallString< 32 >
clang::CoroutineBodyStmt::getReturnStmt
Stmt * getReturnStmt() const
Definition: StmtCXX.h:413
getCoroutineSuspendExprReturnType
static QualType getCoroutineSuspendExprReturnType(const ASTContext &Ctx, const CoroutineSuspendExpr *E)
Definition: CGCoroutine.cpp:290
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bool isValid() const
Definition: Address.h:35
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static CharUnits One()
One - Construct a CharUnits quantity of one.
Definition: CharUnits.h:58
clang::CodeGen::CodeGenFunction::EmitAutoVarAlloca
AutoVarEmission EmitAutoVarAlloca(const VarDecl &var)
EmitAutoVarAlloca - Emit the alloca and debug information for a local variable.
Definition: CGDecl.cpp:1379
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ASTContext & getContext() const
Definition: CodeGenFunction.h:1627
clang::FunctionProtoType
Represents a prototype with parameter type info, e.g.
Definition: Type.h:3754
clang::CodeGen::RValue
RValue - This trivial value class is used to represent the result of an expression that is evaluated...
Definition: CGValue.h:39
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Definition: CGCoroutine.cpp:31
getBundlesForCoroEnd
static SmallVector< llvm::OperandBundleDef, 1 > getBundlesForCoroEnd(CodeGenFunction &CGF)
Definition: CGCoroutine.cpp:383
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static AutoVarEmission invalid()
Definition: CodeGenFunction.h:2740
buildSuspendPrefixStr
static SmallString< 32 > buildSuspendPrefixStr(CGCoroData &Coro, AwaitKind Kind)
Definition: CGCoroutine.cpp:112
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This represents one expression.
Definition: Expr.h:108
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void EmitAutoVarInit(const AutoVarEmission &emission)
Definition: CGDecl.cpp:1745
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static Address invalid()
Definition: Address.h:34
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Enters a new scope for capturing cleanups, all of which will be executed once the scope is exited...
Definition: CodeGenFunction.h:709
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unsigned AwaitNum
Definition: CGCoroutine.cpp:36
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CXXTryStmt - A C++ try block, including all handlers.
Definition: StmtCXX.h:68
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Definition: ExceptionSpecificationType.h:55
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QualType getType() const
Definition: Expr.h:137
StmtVisitor.h
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ValueDecl * getDecl()
Definition: Expr.h:1247
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clang::CodeGen::CodeGenFunction::CurCoro
CGCoroInfo CurCoro
Definition: CodeGenFunction.h:311
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CodeGenFunction::JumpDest FinalJD
Definition: CGCoroutine.cpp:62
CGCleanup.h
Kind
Kind
Definition: ChrootChecker.cpp:29
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unsigned YieldNum
Definition: CGCoroutine.cpp:37
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llvm::Value * ResumeEHVar
Definition: CGCoroutine.cpp:53
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std::unique_ptr< CGCoroData > Data
Definition: CodeGenFunction.h:307
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static bool Ret(InterpState &S, CodePtr &PC, APValue &Result)
Definition: Interp.cpp:34
IsPattern::No
emitSuspendExpression
static LValueOrRValue emitSuspendExpression(CodeGenFunction &CGF, CGCoroData &Coro, CoroutineSuspendExpr const &S, AwaitKind Kind, AggValueSlot aggSlot, bool ignoreResult, bool forLValue)
Definition: CGCoroutine.cpp:175
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Stmt * ExceptionHandler
Definition: CGCoroutine.cpp:47
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RValue EmitCoroutineIntrinsic(const CallExpr *E, unsigned int IID)
Definition: CGCoroutine.cpp:696
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DeclStmt - Adaptor class for mixing declarations with statements and expressions. ...
Definition: Stmt.h:1225
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An aggregate value slot.
Definition: CGValue.h:439
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SourceLocation getBeginLoc() const LLVM_READONLY
Definition: StmtCXX.h:421
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Definition: CGCoroutine.cpp:58
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void EmitStmt(const Stmt *S, ArrayRef< const Attr *> Attrs=None)
EmitStmt - Emit the code for the statement.
Definition: CGStmt.cpp:45
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StmtVisitor - This class implements a simple visitor for Stmt subclasses.
Definition: StmtVisitor.h:183
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Definition: ExprCXX.h:4670
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arg_range arguments()
Definition: Expr.h:2739
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Definition: LLVM.h:35
clang::CodeGen::Address
An aligned address.
Definition: Address.h:24
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Definition: CGCoroutine.cpp:44
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Definition: CGException.cpp:1561
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void Error(SourceLocation loc, StringRef error)
Emit a general error that something can&#39;t be done.
Definition: CodeGenModule.cpp:744
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SourceLocation getExprLoc() const LLVM_READONLY
getExprLoc - Return the preferred location for the arrow when diagnosing a problem with a generic exp...
Definition: Expr.cpp:224
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EmitScalarExpr - Emit the computation of the specified expression of LLVM scalar type, returning the result.
Definition: CGExprScalar.cpp:4543
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EHScopeStack EHStack
Definition: CodeGenFunction.h:498
clang
Dataflow Directional Tag Classes.
Definition: CFGReachabilityAnalysis.h:21
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Stmt * getReturnStmtOnAllocFailure() const
Definition: StmtCXX.h:414
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Expr * getAllocate() const
Definition: StmtCXX.h:403
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static AggValueSlot ignored()
ignored - Returns an aggregate value slot indicating that the aggregate value is being ignored...
Definition: CGValue.h:501
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Represents a &#39;co_yield&#39; expression.
Definition: ExprCXX.h:4786
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Expr * getOperand() const
Retrieve the operand of the &#39;co_return&#39; statement.
Definition: StmtCXX.h:480
clang::DeclStmt::getSingleDecl
const Decl * getSingleDecl() const
Definition: Stmt.h:1240
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Definition: CodeGenModule.cpp:4621
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Stmt * getInitSuspendStmt() const
Definition: StmtCXX.h:389
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llvm::StoreInst * CreateStore(llvm::Value *Val, Address Addr, bool IsVolatile=false)
Definition: CGBuilder.h:107
AwaitKind
AwaitKind
Definition: CGCoroutine.cpp:26
clang::DeclStmt::isSingleDecl
bool isSingleDecl() const
isSingleDecl - This method returns true if this DeclStmt refers to a single Decl. ...
Definition: Stmt.h:1238
clang::CodeGen::CodeGenFunction::EmitCoreturnStmt
void EmitCoreturnStmt(const CoreturnStmt &S)
Definition: CGCoroutine.cpp:275
emitBodyAndFallthrough
static void emitBodyAndFallthrough(CodeGenFunction &CGF, const CoroutineBodyStmt &S, Stmt *Body)
Definition: CGCoroutine.cpp:534
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llvm::DenseMap< const Decl *, Address > DeclMapTy
Definition: CodeGenFunction.h:821
clang::CodeGen::CodeGenFunction::EmitAutoVarCleanups
void EmitAutoVarCleanups(const AutoVarEmission &emission)
Definition: CGDecl.cpp:1980
createCoroData
static void createCoroData(CodeGenFunction &CGF, CodeGenFunction::CGCoroInfo &CurCoro, llvm::CallInst *CoroId, CallExpr const *CoroIdExpr=nullptr)
Definition: CGCoroutine.cpp:89
clang::CoroutineBodyStmt
Represents the body of a coroutine.
Definition: StmtCXX.h:317
clang::CoawaitExpr
Represents a &#39;co_await&#39; expression.
Definition: ExprCXX.h:4699
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llvm::PointerType * Int8PtrTy
Definition: CodeGenTypeCache.h:54
clang::CodeGen::CodeGenFunction::EmitBlock
void EmitBlock(llvm::BasicBlock *BB, bool IsFinished=false)
EmitBlock - Emit the given block.
Definition: CGStmt.cpp:473
clang::CodeGen::CodeGenFunction::EnterCXXTryStmt
void EnterCXXTryStmt(const CXXTryStmt &S, bool IsFnTryBlock=false)
Definition: CGException.cpp:559
clang::CodeGen::CodeGenFunction::AutoVarEmission
Definition: CodeGenFunction.h:2699
clang::CoroutineSuspendExpr
Represents an expression that might suspend coroutine execution; either a co_await or co_yield expres...
Definition: ExprCXX.h:4612
clang::CoroutineSuspendExpr::getResumeExpr
Expr * getResumeExpr() const
Definition: ExprCXX.h:4674
clang::CodeGen::CodeGenFunction::OpaqueValueMappingData::bind
static OpaqueValueMappingData bind(CodeGenFunction &CGF, const OpaqueValueExpr *ov, const Expr *e)
Definition: CodeGenFunction.h:1115
clang::CodeGen::NormalAndEHCleanup
Definition: EHScopeStack.h:86
clang::CoreturnStmt::getPromiseCall
Expr * getPromiseCall() const
Retrieve the promise call that results from this &#39;co_return&#39; statement.
Definition: StmtCXX.h:485
clang::CodeGen::CodeGenFunction::EmitCoawaitLValue
LValue EmitCoawaitLValue(const CoawaitExpr *E)
Definition: CGCoroutine.cpp:301
clang::Type::isVoidType
bool isVoidType() const
Definition: Type.h:6777
clang::CoroutineBodyStmt::getFallthroughHandler
Stmt * getFallthroughHandler() const
Definition: StmtCXX.h:399
clang::CXXTryStmt::Create
static CXXTryStmt * Create(const ASTContext &C, SourceLocation tryLoc, Stmt *tryBlock, ArrayRef< Stmt *> handlers)
Definition: StmtCXX.cpp:25
clang::CXXCatchStmt
CXXCatchStmt - This represents a C++ catch block.
Definition: StmtCXX.h:28
clang::CodeGen::CodeGenFunction::EmitLValue
LValue EmitLValue(const Expr *E)
EmitLValue - Emit code to compute a designator that specifies the location of the expression...
Definition: CGExpr.cpp:1246
clang::CallExpr
CallExpr - Represents a function call (C99 6.5.2.2, C++ [expr.call]).
Definition: Expr.h:2546
clang::CoroutineBodyStmt::getBody
Stmt * getBody() const
Retrieve the body of the coroutine as written.
Definition: StmtCXX.h:378
clang::DeclRefExpr
A reference to a declared variable, function, enum, etc.
Definition: Expr.h:1171
clang::CodeGen::RValue::get
static RValue get(llvm::Value *V)
Definition: CGValue.h:86
clang::CodeGen::CodeGenFunction::ExitCXXTryStmt
void ExitCXXTryStmt(const CXXTryStmt &S, bool IsFnTryBlock=false)
Definition: CGException.cpp:1135
clang::CodeGen::CodeGenFunction::EmitBranchThroughCleanup
void EmitBranchThroughCleanup(JumpDest Dest)
EmitBranchThroughCleanup - Emit a branch from the current insert block through the normal cleanup han...
Definition: CGCleanup.cpp:1044
clang::CodeGen::CodeGenFunction::CGCoroInfo::~CGCoroInfo
~CGCoroInfo()
Definition: CGCoroutine.cpp:87
clang::CodeGen::CGBuilderTy
Definition: CGBuilder.h:44
clang::CodeGen::LValue
LValue - This represents an lvalue references.
Definition: CGValue.h:167
clang::CallExpr::getBeginLoc
SourceLocation getBeginLoc() const LLVM_READONLY
Definition: Expr.cpp:1531
clang::CodeGen::EHScopeStack::Cleanup
Information for lazily generating a cleanup.
Definition: EHScopeStack.h:146
clang::CodeGen::CodeGenFunction::CGM
CodeGenModule & CGM
Definition: CodeGenFunction.h:258
clang::CoroutineBodyStmt::getFinalSuspendStmt
Stmt * getFinalSuspendStmt() const
Definition: StmtCXX.h:392