clang  6.0.0svn
SemaCoroutine.cpp
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1 //===--- SemaCoroutines.cpp - Semantic Analysis for Coroutines ------------===//
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 file implements semantic analysis for C++ Coroutines.
11 //
12 //===----------------------------------------------------------------------===//
13 
14 #include "CoroutineStmtBuilder.h"
15 #include "clang/AST/Decl.h"
16 #include "clang/AST/ExprCXX.h"
17 #include "clang/AST/StmtCXX.h"
18 #include "clang/Lex/Preprocessor.h"
20 #include "clang/Sema/Overload.h"
22 
23 using namespace clang;
24 using namespace sema;
25 
26 static LookupResult lookupMember(Sema &S, const char *Name, CXXRecordDecl *RD,
27  SourceLocation Loc, bool &Res) {
29  LookupResult LR(S, DN, Loc, Sema::LookupMemberName);
30  // Suppress diagnostics when a private member is selected. The same warnings
31  // will be produced again when building the call.
33  Res = S.LookupQualifiedName(LR, RD);
34  return LR;
35 }
36 
37 static bool lookupMember(Sema &S, const char *Name, CXXRecordDecl *RD,
38  SourceLocation Loc) {
39  bool Res;
40  lookupMember(S, Name, RD, Loc, Res);
41  return Res;
42 }
43 
44 /// Look up the std::coroutine_traits<...>::promise_type for the given
45 /// function type.
47  SourceLocation KwLoc) {
48  const FunctionProtoType *FnType = FD->getType()->castAs<FunctionProtoType>();
49  const SourceLocation FuncLoc = FD->getLocation();
50  // FIXME: Cache std::coroutine_traits once we've found it.
52  if (!StdExp) {
53  S.Diag(KwLoc, diag::err_implied_coroutine_type_not_found)
54  << "std::experimental::coroutine_traits";
55  return QualType();
56  }
57 
58  LookupResult Result(S, &S.PP.getIdentifierTable().get("coroutine_traits"),
59  FuncLoc, Sema::LookupOrdinaryName);
60  if (!S.LookupQualifiedName(Result, StdExp)) {
61  S.Diag(KwLoc, diag::err_implied_coroutine_type_not_found)
62  << "std::experimental::coroutine_traits";
63  return QualType();
64  }
65 
66  ClassTemplateDecl *CoroTraits = Result.getAsSingle<ClassTemplateDecl>();
67  if (!CoroTraits) {
68  Result.suppressDiagnostics();
69  // We found something weird. Complain about the first thing we found.
70  NamedDecl *Found = *Result.begin();
71  S.Diag(Found->getLocation(), diag::err_malformed_std_coroutine_traits);
72  return QualType();
73  }
74 
75  // Form template argument list for coroutine_traits<R, P1, P2, ...> according
76  // to [dcl.fct.def.coroutine]3
77  TemplateArgumentListInfo Args(KwLoc, KwLoc);
78  auto AddArg = [&](QualType T) {
81  };
82  AddArg(FnType->getReturnType());
83  // If the function is a non-static member function, add the type
84  // of the implicit object parameter before the formal parameters.
85  if (auto *MD = dyn_cast<CXXMethodDecl>(FD)) {
86  if (MD->isInstance()) {
87  // [over.match.funcs]4
88  // For non-static member functions, the type of the implicit object
89  // parameter is
90  // -- "lvalue reference to cv X" for functions declared without a
91  // ref-qualifier or with the & ref-qualifier
92  // -- "rvalue reference to cv X" for functions declared with the &&
93  // ref-qualifier
94  QualType T =
95  MD->getThisType(S.Context)->getAs<PointerType>()->getPointeeType();
96  T = FnType->getRefQualifier() == RQ_RValue
98  : S.Context.getLValueReferenceType(T, /*SpelledAsLValue*/ true);
99  AddArg(T);
100  }
101  }
102  for (QualType T : FnType->getParamTypes())
103  AddArg(T);
104 
105  // Build the template-id.
106  QualType CoroTrait =
107  S.CheckTemplateIdType(TemplateName(CoroTraits), KwLoc, Args);
108  if (CoroTrait.isNull())
109  return QualType();
110  if (S.RequireCompleteType(KwLoc, CoroTrait,
111  diag::err_coroutine_type_missing_specialization))
112  return QualType();
113 
114  auto *RD = CoroTrait->getAsCXXRecordDecl();
115  assert(RD && "specialization of class template is not a class?");
116 
117  // Look up the ::promise_type member.
118  LookupResult R(S, &S.PP.getIdentifierTable().get("promise_type"), KwLoc,
120  S.LookupQualifiedName(R, RD);
121  auto *Promise = R.getAsSingle<TypeDecl>();
122  if (!Promise) {
123  S.Diag(FuncLoc,
124  diag::err_implied_std_coroutine_traits_promise_type_not_found)
125  << RD;
126  return QualType();
127  }
128  // The promise type is required to be a class type.
129  QualType PromiseType = S.Context.getTypeDeclType(Promise);
130 
131  auto buildElaboratedType = [&]() {
132  auto *NNS = NestedNameSpecifier::Create(S.Context, nullptr, StdExp);
133  NNS = NestedNameSpecifier::Create(S.Context, NNS, false,
134  CoroTrait.getTypePtr());
135  return S.Context.getElaboratedType(ETK_None, NNS, PromiseType);
136  };
137 
138  if (!PromiseType->getAsCXXRecordDecl()) {
139  S.Diag(FuncLoc,
140  diag::err_implied_std_coroutine_traits_promise_type_not_class)
141  << buildElaboratedType();
142  return QualType();
143  }
144  if (S.RequireCompleteType(FuncLoc, buildElaboratedType(),
145  diag::err_coroutine_promise_type_incomplete))
146  return QualType();
147 
148  return PromiseType;
149 }
150 
151 /// Look up the std::experimental::coroutine_handle<PromiseType>.
153  SourceLocation Loc) {
154  if (PromiseType.isNull())
155  return QualType();
156 
158  assert(StdExp && "Should already be diagnosed");
159 
160  LookupResult Result(S, &S.PP.getIdentifierTable().get("coroutine_handle"),
162  if (!S.LookupQualifiedName(Result, StdExp)) {
163  S.Diag(Loc, diag::err_implied_coroutine_type_not_found)
164  << "std::experimental::coroutine_handle";
165  return QualType();
166  }
167 
168  ClassTemplateDecl *CoroHandle = Result.getAsSingle<ClassTemplateDecl>();
169  if (!CoroHandle) {
170  Result.suppressDiagnostics();
171  // We found something weird. Complain about the first thing we found.
172  NamedDecl *Found = *Result.begin();
173  S.Diag(Found->getLocation(), diag::err_malformed_std_coroutine_handle);
174  return QualType();
175  }
176 
177  // Form template argument list for coroutine_handle<Promise>.
178  TemplateArgumentListInfo Args(Loc, Loc);
180  TemplateArgument(PromiseType),
181  S.Context.getTrivialTypeSourceInfo(PromiseType, Loc)));
182 
183  // Build the template-id.
184  QualType CoroHandleType =
185  S.CheckTemplateIdType(TemplateName(CoroHandle), Loc, Args);
186  if (CoroHandleType.isNull())
187  return QualType();
188  if (S.RequireCompleteType(Loc, CoroHandleType,
189  diag::err_coroutine_type_missing_specialization))
190  return QualType();
191 
192  return CoroHandleType;
193 }
194 
196  StringRef Keyword) {
197  // 'co_await' and 'co_yield' are not permitted in unevaluated operands.
198  if (S.isUnevaluatedContext()) {
199  S.Diag(Loc, diag::err_coroutine_unevaluated_context) << Keyword;
200  return false;
201  }
202 
203  // Any other usage must be within a function.
204  auto *FD = dyn_cast<FunctionDecl>(S.CurContext);
205  if (!FD) {
206  S.Diag(Loc, isa<ObjCMethodDecl>(S.CurContext)
207  ? diag::err_coroutine_objc_method
208  : diag::err_coroutine_outside_function) << Keyword;
209  return false;
210  }
211 
212  // An enumeration for mapping the diagnostic type to the correct diagnostic
213  // selection index.
214  enum InvalidFuncDiag {
215  DiagCtor = 0,
216  DiagDtor,
217  DiagCopyAssign,
218  DiagMoveAssign,
219  DiagMain,
220  DiagConstexpr,
221  DiagAutoRet,
222  DiagVarargs,
223  };
224  bool Diagnosed = false;
225  auto DiagInvalid = [&](InvalidFuncDiag ID) {
226  S.Diag(Loc, diag::err_coroutine_invalid_func_context) << ID << Keyword;
227  Diagnosed = true;
228  return false;
229  };
230 
231  // Diagnose when a constructor, destructor, copy/move assignment operator,
232  // or the function 'main' are declared as a coroutine.
233  auto *MD = dyn_cast<CXXMethodDecl>(FD);
234  if (MD && isa<CXXConstructorDecl>(MD))
235  return DiagInvalid(DiagCtor);
236  else if (MD && isa<CXXDestructorDecl>(MD))
237  return DiagInvalid(DiagDtor);
238  else if (MD && MD->isCopyAssignmentOperator())
239  return DiagInvalid(DiagCopyAssign);
240  else if (MD && MD->isMoveAssignmentOperator())
241  return DiagInvalid(DiagMoveAssign);
242  else if (FD->isMain())
243  return DiagInvalid(DiagMain);
244 
245  // Emit a diagnostics for each of the following conditions which is not met.
246  if (FD->isConstexpr())
247  DiagInvalid(DiagConstexpr);
248  if (FD->getReturnType()->isUndeducedType())
249  DiagInvalid(DiagAutoRet);
250  if (FD->isVariadic())
251  DiagInvalid(DiagVarargs);
252 
253  return !Diagnosed;
254 }
255 
257  SourceLocation Loc) {
258  DeclarationName OpName =
259  SemaRef.Context.DeclarationNames.getCXXOperatorName(OO_Coawait);
260  LookupResult Operators(SemaRef, OpName, SourceLocation(),
262  SemaRef.LookupName(Operators, S);
263 
264  assert(!Operators.isAmbiguous() && "Operator lookup cannot be ambiguous");
265  const auto &Functions = Operators.asUnresolvedSet();
266  bool IsOverloaded =
267  Functions.size() > 1 ||
268  (Functions.size() == 1 && isa<FunctionTemplateDecl>(*Functions.begin()));
269  Expr *CoawaitOp = UnresolvedLookupExpr::Create(
270  SemaRef.Context, /*NamingClass*/ nullptr, NestedNameSpecifierLoc(),
271  DeclarationNameInfo(OpName, Loc), /*RequiresADL*/ true, IsOverloaded,
272  Functions.begin(), Functions.end());
273  assert(CoawaitOp);
274  return CoawaitOp;
275 }
276 
277 /// Build a call to 'operator co_await' if there is a suitable operator for
278 /// the given expression.
280  Expr *E,
281  UnresolvedLookupExpr *Lookup) {
282  UnresolvedSet<16> Functions;
283  Functions.append(Lookup->decls_begin(), Lookup->decls_end());
284  return SemaRef.CreateOverloadedUnaryOp(Loc, UO_Coawait, Functions, E);
285 }
286 
288  SourceLocation Loc, Expr *E) {
289  ExprResult R = buildOperatorCoawaitLookupExpr(SemaRef, S, Loc);
290  if (R.isInvalid())
291  return ExprError();
292  return buildOperatorCoawaitCall(SemaRef, Loc, E,
293  cast<UnresolvedLookupExpr>(R.get()));
294 }
295 
297  MultiExprArg CallArgs) {
298  StringRef Name = S.Context.BuiltinInfo.getName(Id);
300  S.LookupName(R, S.TUScope, /*AllowBuiltinCreation=*/true);
301 
302  auto *BuiltInDecl = R.getAsSingle<FunctionDecl>();
303  assert(BuiltInDecl && "failed to find builtin declaration");
304 
305  ExprResult DeclRef =
306  S.BuildDeclRefExpr(BuiltInDecl, BuiltInDecl->getType(), VK_LValue, Loc);
307  assert(DeclRef.isUsable() && "Builtin reference cannot fail");
308 
309  ExprResult Call =
310  S.ActOnCallExpr(/*Scope=*/nullptr, DeclRef.get(), Loc, CallArgs, Loc);
311 
312  assert(!Call.isInvalid() && "Call to builtin cannot fail!");
313  return Call.get();
314 }
315 
317  SourceLocation Loc) {
318  QualType CoroHandleType = lookupCoroutineHandleType(S, PromiseType, Loc);
319  if (CoroHandleType.isNull())
320  return ExprError();
321 
322  DeclContext *LookupCtx = S.computeDeclContext(CoroHandleType);
323  LookupResult Found(S, &S.PP.getIdentifierTable().get("from_address"), Loc,
325  if (!S.LookupQualifiedName(Found, LookupCtx)) {
326  S.Diag(Loc, diag::err_coroutine_handle_missing_member)
327  << "from_address";
328  return ExprError();
329  }
330 
331  Expr *FramePtr =
332  buildBuiltinCall(S, Loc, Builtin::BI__builtin_coro_frame, {});
333 
334  CXXScopeSpec SS;
335  ExprResult FromAddr =
336  S.BuildDeclarationNameExpr(SS, Found, /*NeedsADL=*/false);
337  if (FromAddr.isInvalid())
338  return ExprError();
339 
340  return S.ActOnCallExpr(nullptr, FromAddr.get(), Loc, FramePtr, Loc);
341 }
342 
344  enum AwaitCallType { ACT_Ready, ACT_Suspend, ACT_Resume };
345  Expr *Results[3];
347  bool IsInvalid;
348 };
349 
351  StringRef Name, MultiExprArg Args) {
352  DeclarationNameInfo NameInfo(&S.PP.getIdentifierTable().get(Name), Loc);
353 
354  // FIXME: Fix BuildMemberReferenceExpr to take a const CXXScopeSpec&.
355  CXXScopeSpec SS;
357  Base, Base->getType(), Loc, /*IsPtr=*/false, SS,
358  SourceLocation(), nullptr, NameInfo, /*TemplateArgs=*/nullptr,
359  /*Scope=*/nullptr);
360  if (Result.isInvalid())
361  return ExprError();
362 
363  return S.ActOnCallExpr(nullptr, Result.get(), Loc, Args, Loc, nullptr);
364 }
365 
366 // See if return type is coroutine-handle and if so, invoke builtin coro-resume
367 // on its address. This is to enable experimental support for coroutine-handle
368 // returning await_suspend that results in a guranteed tail call to the target
369 // coroutine.
370 static Expr *maybeTailCall(Sema &S, QualType RetType, Expr *E,
371  SourceLocation Loc) {
372  if (RetType->isReferenceType())
373  return nullptr;
374  Type const *T = RetType.getTypePtr();
375  if (!T->isClassType() && !T->isStructureType())
376  return nullptr;
377 
378  // FIXME: Add convertability check to coroutine_handle<>. Possibly via
379  // EvaluateBinaryTypeTrait(BTT_IsConvertible, ...) which is at the moment
380  // a private function in SemaExprCXX.cpp
381 
382  ExprResult AddressExpr = buildMemberCall(S, E, Loc, "address", None);
383  if (AddressExpr.isInvalid())
384  return nullptr;
385 
386  Expr *JustAddress = AddressExpr.get();
387  // FIXME: Check that the type of AddressExpr is void*
388  return buildBuiltinCall(S, Loc, Builtin::BI__builtin_coro_resume,
389  JustAddress);
390 }
391 
392 /// Build calls to await_ready, await_suspend, and await_resume for a co_await
393 /// expression.
395  SourceLocation Loc, Expr *E) {
396  OpaqueValueExpr *Operand = new (S.Context)
397  OpaqueValueExpr(Loc, E->getType(), VK_LValue, E->getObjectKind(), E);
398 
399  // Assume invalid until we see otherwise.
400  ReadySuspendResumeResult Calls = {{}, Operand, /*IsInvalid=*/true};
401 
402  ExprResult CoroHandleRes = buildCoroutineHandle(S, CoroPromise->getType(), Loc);
403  if (CoroHandleRes.isInvalid())
404  return Calls;
405  Expr *CoroHandle = CoroHandleRes.get();
406 
407  const StringRef Funcs[] = {"await_ready", "await_suspend", "await_resume"};
408  MultiExprArg Args[] = {None, CoroHandle, None};
409  for (size_t I = 0, N = llvm::array_lengthof(Funcs); I != N; ++I) {
410  ExprResult Result = buildMemberCall(S, Operand, Loc, Funcs[I], Args[I]);
411  if (Result.isInvalid())
412  return Calls;
413  Calls.Results[I] = Result.get();
414  }
415 
416  // Assume the calls are valid; all further checking should make them invalid.
417  Calls.IsInvalid = false;
418 
420  CallExpr *AwaitReady = cast<CallExpr>(Calls.Results[ACT::ACT_Ready]);
421  if (!AwaitReady->getType()->isDependentType()) {
422  // [expr.await]p3 [...]
423  // — await-ready is the expression e.await_ready(), contextually converted
424  // to bool.
425  ExprResult Conv = S.PerformContextuallyConvertToBool(AwaitReady);
426  if (Conv.isInvalid()) {
427  S.Diag(AwaitReady->getDirectCallee()->getLocStart(),
428  diag::note_await_ready_no_bool_conversion);
429  S.Diag(Loc, diag::note_coroutine_promise_call_implicitly_required)
430  << AwaitReady->getDirectCallee() << E->getSourceRange();
431  Calls.IsInvalid = true;
432  }
433  Calls.Results[ACT::ACT_Ready] = Conv.get();
434  }
435  CallExpr *AwaitSuspend = cast<CallExpr>(Calls.Results[ACT::ACT_Suspend]);
436  if (!AwaitSuspend->getType()->isDependentType()) {
437  // [expr.await]p3 [...]
438  // - await-suspend is the expression e.await_suspend(h), which shall be
439  // a prvalue of type void or bool.
440  QualType RetType = AwaitSuspend->getCallReturnType(S.Context);
441 
442  // Experimental support for coroutine_handle returning await_suspend.
443  if (Expr *TailCallSuspend = maybeTailCall(S, RetType, AwaitSuspend, Loc))
444  Calls.Results[ACT::ACT_Suspend] = TailCallSuspend;
445  else {
446  // non-class prvalues always have cv-unqualified types
447  if (RetType->isReferenceType() ||
448  (!RetType->isBooleanType() && !RetType->isVoidType())) {
449  S.Diag(AwaitSuspend->getCalleeDecl()->getLocation(),
450  diag::err_await_suspend_invalid_return_type)
451  << RetType;
452  S.Diag(Loc, diag::note_coroutine_promise_call_implicitly_required)
453  << AwaitSuspend->getDirectCallee();
454  Calls.IsInvalid = true;
455  }
456  }
457  }
458 
459  return Calls;
460 }
461 
463  SourceLocation Loc, StringRef Name,
464  MultiExprArg Args) {
465 
466  // Form a reference to the promise.
467  ExprResult PromiseRef = S.BuildDeclRefExpr(
468  Promise, Promise->getType().getNonReferenceType(), VK_LValue, Loc);
469  if (PromiseRef.isInvalid())
470  return ExprError();
471 
472  return buildMemberCall(S, PromiseRef.get(), Loc, Name, Args);
473 }
474 
476  assert(isa<FunctionDecl>(CurContext) && "not in a function scope");
477  auto *FD = cast<FunctionDecl>(CurContext);
478  bool IsThisDependentType = [&] {
479  if (auto *MD = dyn_cast_or_null<CXXMethodDecl>(FD))
480  return MD->isInstance() && MD->getThisType(Context)->isDependentType();
481  else
482  return false;
483  }();
484 
485  QualType T = FD->getType()->isDependentType() || IsThisDependentType
486  ? Context.DependentTy
487  : lookupPromiseType(*this, FD, Loc);
488  if (T.isNull())
489  return nullptr;
490 
491  auto *VD = VarDecl::Create(Context, FD, FD->getLocation(), FD->getLocation(),
492  &PP.getIdentifierTable().get("__promise"), T,
493  Context.getTrivialTypeSourceInfo(T, Loc), SC_None);
494  CheckVariableDeclarationType(VD);
495  if (VD->isInvalidDecl())
496  return nullptr;
497  ActOnUninitializedDecl(VD);
498  FD->addDecl(VD);
499  assert(!VD->isInvalidDecl());
500  return VD;
501 }
502 
503 /// Check that this is a context in which a coroutine suspension can appear.
505  StringRef Keyword,
506  bool IsImplicit = false) {
507  if (!isValidCoroutineContext(S, Loc, Keyword))
508  return nullptr;
509 
510  assert(isa<FunctionDecl>(S.CurContext) && "not in a function scope");
511 
512  auto *ScopeInfo = S.getCurFunction();
513  assert(ScopeInfo && "missing function scope for function");
514 
515  if (ScopeInfo->FirstCoroutineStmtLoc.isInvalid() && !IsImplicit)
516  ScopeInfo->setFirstCoroutineStmt(Loc, Keyword);
517 
518  if (ScopeInfo->CoroutinePromise)
519  return ScopeInfo;
520 
521  ScopeInfo->CoroutinePromise = S.buildCoroutinePromise(Loc);
522  if (!ScopeInfo->CoroutinePromise)
523  return nullptr;
524 
525  return ScopeInfo;
526 }
527 
529  StringRef Keyword) {
530  if (!checkCoroutineContext(*this, KWLoc, Keyword))
531  return false;
532  auto *ScopeInfo = getCurFunction();
533  assert(ScopeInfo->CoroutinePromise);
534 
535  // If we have existing coroutine statements then we have already built
536  // the initial and final suspend points.
537  if (!ScopeInfo->NeedsCoroutineSuspends)
538  return true;
539 
540  ScopeInfo->setNeedsCoroutineSuspends(false);
541 
542  auto *Fn = cast<FunctionDecl>(CurContext);
543  SourceLocation Loc = Fn->getLocation();
544  // Build the initial suspend point
545  auto buildSuspends = [&](StringRef Name) mutable -> StmtResult {
546  ExprResult Suspend =
547  buildPromiseCall(*this, ScopeInfo->CoroutinePromise, Loc, Name, None);
548  if (Suspend.isInvalid())
549  return StmtError();
550  Suspend = buildOperatorCoawaitCall(*this, SC, Loc, Suspend.get());
551  if (Suspend.isInvalid())
552  return StmtError();
553  Suspend = BuildResolvedCoawaitExpr(Loc, Suspend.get(),
554  /*IsImplicit*/ true);
555  Suspend = ActOnFinishFullExpr(Suspend.get());
556  if (Suspend.isInvalid()) {
557  Diag(Loc, diag::note_coroutine_promise_suspend_implicitly_required)
558  << ((Name == "initial_suspend") ? 0 : 1);
559  Diag(KWLoc, diag::note_declared_coroutine_here) << Keyword;
560  return StmtError();
561  }
562  return cast<Stmt>(Suspend.get());
563  };
564 
565  StmtResult InitSuspend = buildSuspends("initial_suspend");
566  if (InitSuspend.isInvalid())
567  return true;
568 
569  StmtResult FinalSuspend = buildSuspends("final_suspend");
570  if (FinalSuspend.isInvalid())
571  return true;
572 
573  ScopeInfo->setCoroutineSuspends(InitSuspend.get(), FinalSuspend.get());
574 
575  return true;
576 }
577 
579  if (!ActOnCoroutineBodyStart(S, Loc, "co_await")) {
580  CorrectDelayedTyposInExpr(E);
581  return ExprError();
582  }
583 
584  if (E->getType()->isPlaceholderType()) {
585  ExprResult R = CheckPlaceholderExpr(E);
586  if (R.isInvalid()) return ExprError();
587  E = R.get();
588  }
589  ExprResult Lookup = buildOperatorCoawaitLookupExpr(*this, S, Loc);
590  if (Lookup.isInvalid())
591  return ExprError();
592  return BuildUnresolvedCoawaitExpr(Loc, E,
593  cast<UnresolvedLookupExpr>(Lookup.get()));
594 }
595 
597  UnresolvedLookupExpr *Lookup) {
598  auto *FSI = checkCoroutineContext(*this, Loc, "co_await");
599  if (!FSI)
600  return ExprError();
601 
602  if (E->getType()->isPlaceholderType()) {
603  ExprResult R = CheckPlaceholderExpr(E);
604  if (R.isInvalid())
605  return ExprError();
606  E = R.get();
607  }
608 
609  auto *Promise = FSI->CoroutinePromise;
610  if (Promise->getType()->isDependentType()) {
611  Expr *Res =
612  new (Context) DependentCoawaitExpr(Loc, Context.DependentTy, E, Lookup);
613  return Res;
614  }
615 
616  auto *RD = Promise->getType()->getAsCXXRecordDecl();
617  if (lookupMember(*this, "await_transform", RD, Loc)) {
618  ExprResult R = buildPromiseCall(*this, Promise, Loc, "await_transform", E);
619  if (R.isInvalid()) {
620  Diag(Loc,
621  diag::note_coroutine_promise_implicit_await_transform_required_here)
622  << E->getSourceRange();
623  return ExprError();
624  }
625  E = R.get();
626  }
627  ExprResult Awaitable = buildOperatorCoawaitCall(*this, Loc, E, Lookup);
628  if (Awaitable.isInvalid())
629  return ExprError();
630 
631  return BuildResolvedCoawaitExpr(Loc, Awaitable.get());
632 }
633 
635  bool IsImplicit) {
636  auto *Coroutine = checkCoroutineContext(*this, Loc, "co_await", IsImplicit);
637  if (!Coroutine)
638  return ExprError();
639 
640  if (E->getType()->isPlaceholderType()) {
641  ExprResult R = CheckPlaceholderExpr(E);
642  if (R.isInvalid()) return ExprError();
643  E = R.get();
644  }
645 
646  if (E->getType()->isDependentType()) {
647  Expr *Res = new (Context)
648  CoawaitExpr(Loc, Context.DependentTy, E, IsImplicit);
649  return Res;
650  }
651 
652  // If the expression is a temporary, materialize it as an lvalue so that we
653  // can use it multiple times.
654  if (E->getValueKind() == VK_RValue)
655  E = CreateMaterializeTemporaryExpr(E->getType(), E, true);
656 
657  // Build the await_ready, await_suspend, await_resume calls.
659  buildCoawaitCalls(*this, Coroutine->CoroutinePromise, Loc, E);
660  if (RSS.IsInvalid)
661  return ExprError();
662 
663  Expr *Res =
664  new (Context) CoawaitExpr(Loc, E, RSS.Results[0], RSS.Results[1],
665  RSS.Results[2], RSS.OpaqueValue, IsImplicit);
666 
667  return Res;
668 }
669 
671  if (!ActOnCoroutineBodyStart(S, Loc, "co_yield")) {
672  CorrectDelayedTyposInExpr(E);
673  return ExprError();
674  }
675 
676  // Build yield_value call.
677  ExprResult Awaitable = buildPromiseCall(
678  *this, getCurFunction()->CoroutinePromise, Loc, "yield_value", E);
679  if (Awaitable.isInvalid())
680  return ExprError();
681 
682  // Build 'operator co_await' call.
683  Awaitable = buildOperatorCoawaitCall(*this, S, Loc, Awaitable.get());
684  if (Awaitable.isInvalid())
685  return ExprError();
686 
687  return BuildCoyieldExpr(Loc, Awaitable.get());
688 }
690  auto *Coroutine = checkCoroutineContext(*this, Loc, "co_yield");
691  if (!Coroutine)
692  return ExprError();
693 
694  if (E->getType()->isPlaceholderType()) {
695  ExprResult R = CheckPlaceholderExpr(E);
696  if (R.isInvalid()) return ExprError();
697  E = R.get();
698  }
699 
700  if (E->getType()->isDependentType()) {
701  Expr *Res = new (Context) CoyieldExpr(Loc, Context.DependentTy, E);
702  return Res;
703  }
704 
705  // If the expression is a temporary, materialize it as an lvalue so that we
706  // can use it multiple times.
707  if (E->getValueKind() == VK_RValue)
708  E = CreateMaterializeTemporaryExpr(E->getType(), E, true);
709 
710  // Build the await_ready, await_suspend, await_resume calls.
712  buildCoawaitCalls(*this, Coroutine->CoroutinePromise, Loc, E);
713  if (RSS.IsInvalid)
714  return ExprError();
715 
716  Expr *Res =
717  new (Context) CoyieldExpr(Loc, E, RSS.Results[0], RSS.Results[1],
718  RSS.Results[2], RSS.OpaqueValue);
719 
720  return Res;
721 }
722 
724  if (!ActOnCoroutineBodyStart(S, Loc, "co_return")) {
725  CorrectDelayedTyposInExpr(E);
726  return StmtError();
727  }
728  return BuildCoreturnStmt(Loc, E);
729 }
730 
732  bool IsImplicit) {
733  auto *FSI = checkCoroutineContext(*this, Loc, "co_return", IsImplicit);
734  if (!FSI)
735  return StmtError();
736 
737  if (E && E->getType()->isPlaceholderType() &&
738  !E->getType()->isSpecificPlaceholderType(BuiltinType::Overload)) {
739  ExprResult R = CheckPlaceholderExpr(E);
740  if (R.isInvalid()) return StmtError();
741  E = R.get();
742  }
743 
744  // FIXME: If the operand is a reference to a variable that's about to go out
745  // of scope, we should treat the operand as an xvalue for this overload
746  // resolution.
747  VarDecl *Promise = FSI->CoroutinePromise;
748  ExprResult PC;
749  if (E && (isa<InitListExpr>(E) || !E->getType()->isVoidType())) {
750  PC = buildPromiseCall(*this, Promise, Loc, "return_value", E);
751  } else {
752  E = MakeFullDiscardedValueExpr(E).get();
753  PC = buildPromiseCall(*this, Promise, Loc, "return_void", None);
754  }
755  if (PC.isInvalid())
756  return StmtError();
757 
758  Expr *PCE = ActOnFinishFullExpr(PC.get()).get();
759 
760  Stmt *Res = new (Context) CoreturnStmt(Loc, E, PCE, IsImplicit);
761  return Res;
762 }
763 
764 /// Look up the std::nothrow object.
766  NamespaceDecl *Std = S.getStdNamespace();
767  assert(Std && "Should already be diagnosed");
768 
769  LookupResult Result(S, &S.PP.getIdentifierTable().get("nothrow"), Loc,
771  if (!S.LookupQualifiedName(Result, Std)) {
772  // FIXME: <experimental/coroutine> should have been included already.
773  // If we require it to include <new> then this diagnostic is no longer
774  // needed.
775  S.Diag(Loc, diag::err_implicit_coroutine_std_nothrow_type_not_found);
776  return nullptr;
777  }
778 
779  auto *VD = Result.getAsSingle<VarDecl>();
780  if (!VD) {
781  Result.suppressDiagnostics();
782  // We found something weird. Complain about the first thing we found.
783  NamedDecl *Found = *Result.begin();
784  S.Diag(Found->getLocation(), diag::err_malformed_std_nothrow);
785  return nullptr;
786  }
787 
788  ExprResult DR = S.BuildDeclRefExpr(VD, VD->getType(), VK_LValue, Loc);
789  if (DR.isInvalid())
790  return nullptr;
791 
792  return DR.get();
793 }
794 
795 // Find an appropriate delete for the promise.
797  QualType PromiseType) {
798  FunctionDecl *OperatorDelete = nullptr;
799 
800  DeclarationName DeleteName =
802 
803  auto *PointeeRD = PromiseType->getAsCXXRecordDecl();
804  assert(PointeeRD && "PromiseType must be a CxxRecordDecl type");
805 
806  if (S.FindDeallocationFunction(Loc, PointeeRD, DeleteName, OperatorDelete))
807  return nullptr;
808 
809  if (!OperatorDelete) {
810  // Look for a global declaration.
811  const bool CanProvideSize = S.isCompleteType(Loc, PromiseType);
812  const bool Overaligned = false;
813  OperatorDelete = S.FindUsualDeallocationFunction(Loc, CanProvideSize,
814  Overaligned, DeleteName);
815  }
816  S.MarkFunctionReferenced(Loc, OperatorDelete);
817  return OperatorDelete;
818 }
819 
820 
822  FunctionScopeInfo *Fn = getCurFunction();
823  assert(Fn && Fn->isCoroutine() && "not a coroutine");
824  if (!Body) {
825  assert(FD->isInvalidDecl() &&
826  "a null body is only allowed for invalid declarations");
827  return;
828  }
829  // We have a function that uses coroutine keywords, but we failed to build
830  // the promise type.
831  if (!Fn->CoroutinePromise)
832  return FD->setInvalidDecl();
833 
834  if (isa<CoroutineBodyStmt>(Body)) {
835  // Nothing todo. the body is already a transformed coroutine body statement.
836  return;
837  }
838 
839  // Coroutines [stmt.return]p1:
840  // A return statement shall not appear in a coroutine.
841  if (Fn->FirstReturnLoc.isValid()) {
842  assert(Fn->FirstCoroutineStmtLoc.isValid() &&
843  "first coroutine location not set");
844  Diag(Fn->FirstReturnLoc, diag::err_return_in_coroutine);
845  Diag(Fn->FirstCoroutineStmtLoc, diag::note_declared_coroutine_here)
847  }
848  CoroutineStmtBuilder Builder(*this, *FD, *Fn, Body);
849  if (Builder.isInvalid() || !Builder.buildStatements())
850  return FD->setInvalidDecl();
851 
852  // Build body for the coroutine wrapper statement.
853  Body = CoroutineBodyStmt::Create(Context, Builder);
854 }
855 
858  Stmt *Body)
859  : S(S), FD(FD), Fn(Fn), Loc(FD.getLocation()),
860  IsPromiseDependentType(
861  !Fn.CoroutinePromise ||
862  Fn.CoroutinePromise->getType()->isDependentType()) {
863  this->Body = Body;
864  if (!IsPromiseDependentType) {
865  PromiseRecordDecl = Fn.CoroutinePromise->getType()->getAsCXXRecordDecl();
866  assert(PromiseRecordDecl && "Type should have already been checked");
867  }
868  this->IsValid = makePromiseStmt() && makeInitialAndFinalSuspend();
869 }
870 
872  assert(this->IsValid && "coroutine already invalid");
873  this->IsValid = makeReturnObject() && makeParamMoves();
874  if (this->IsValid && !IsPromiseDependentType)
876  return this->IsValid;
877 }
878 
880  assert(this->IsValid && "coroutine already invalid");
881  assert(!this->IsPromiseDependentType &&
882  "coroutine cannot have a dependent promise type");
883  this->IsValid = makeOnException() && makeOnFallthrough() &&
884  makeGroDeclAndReturnStmt() && makeReturnOnAllocFailure() &&
885  makeNewAndDeleteExpr();
886  return this->IsValid;
887 }
888 
890  assert(this->IsValid && "coroutine already invalid");
891  assert(this->ParamMoves.empty() && "param moves already built");
892  return this->IsValid = makeParamMoves();
893 }
894 
895 bool CoroutineStmtBuilder::makePromiseStmt() {
896  // Form a declaration statement for the promise declaration, so that AST
897  // visitors can more easily find it.
898  StmtResult PromiseStmt =
900  if (PromiseStmt.isInvalid())
901  return false;
902 
903  this->Promise = PromiseStmt.get();
904  return true;
905 }
906 
907 bool CoroutineStmtBuilder::makeInitialAndFinalSuspend() {
909  return false;
910  this->InitialSuspend = cast<Expr>(Fn.CoroutineSuspends.first);
911  this->FinalSuspend = cast<Expr>(Fn.CoroutineSuspends.second);
912  return true;
913 }
914 
915 static bool diagReturnOnAllocFailure(Sema &S, Expr *E,
916  CXXRecordDecl *PromiseRecordDecl,
917  FunctionScopeInfo &Fn) {
918  auto Loc = E->getExprLoc();
919  if (auto *DeclRef = dyn_cast_or_null<DeclRefExpr>(E)) {
920  auto *Decl = DeclRef->getDecl();
921  if (CXXMethodDecl *Method = dyn_cast_or_null<CXXMethodDecl>(Decl)) {
922  if (Method->isStatic())
923  return true;
924  else
925  Loc = Decl->getLocation();
926  }
927  }
928 
929  S.Diag(
930  Loc,
931  diag::err_coroutine_promise_get_return_object_on_allocation_failure)
932  << PromiseRecordDecl;
933  S.Diag(Fn.FirstCoroutineStmtLoc, diag::note_declared_coroutine_here)
935  return false;
936 }
937 
938 bool CoroutineStmtBuilder::makeReturnOnAllocFailure() {
939  assert(!IsPromiseDependentType &&
940  "cannot make statement while the promise type is dependent");
941 
942  // [dcl.fct.def.coroutine]/8
943  // The unqualified-id get_return_object_on_allocation_failure is looked up in
944  // the scope of class P by class member access lookup (3.4.5). ...
945  // If an allocation function returns nullptr, ... the coroutine return value
946  // is obtained by a call to ... get_return_object_on_allocation_failure().
947 
948  DeclarationName DN =
949  S.PP.getIdentifierInfo("get_return_object_on_allocation_failure");
950  LookupResult Found(S, DN, Loc, Sema::LookupMemberName);
951  if (!S.LookupQualifiedName(Found, PromiseRecordDecl))
952  return true;
953 
954  CXXScopeSpec SS;
955  ExprResult DeclNameExpr =
956  S.BuildDeclarationNameExpr(SS, Found, /*NeedsADL=*/false);
957  if (DeclNameExpr.isInvalid())
958  return false;
959 
960  if (!diagReturnOnAllocFailure(S, DeclNameExpr.get(), PromiseRecordDecl, Fn))
961  return false;
962 
963  ExprResult ReturnObjectOnAllocationFailure =
964  S.ActOnCallExpr(nullptr, DeclNameExpr.get(), Loc, {}, Loc);
965  if (ReturnObjectOnAllocationFailure.isInvalid())
966  return false;
967 
969  S.BuildReturnStmt(Loc, ReturnObjectOnAllocationFailure.get());
970  if (ReturnStmt.isInvalid()) {
971  S.Diag(Found.getFoundDecl()->getLocation(), diag::note_member_declared_here)
972  << DN;
973  S.Diag(Fn.FirstCoroutineStmtLoc, diag::note_declared_coroutine_here)
975  return false;
976  }
977 
978  this->ReturnStmtOnAllocFailure = ReturnStmt.get();
979  return true;
980 }
981 
982 bool CoroutineStmtBuilder::makeNewAndDeleteExpr() {
983  // Form and check allocation and deallocation calls.
984  assert(!IsPromiseDependentType &&
985  "cannot make statement while the promise type is dependent");
986  QualType PromiseType = Fn.CoroutinePromise->getType();
987 
988  if (S.RequireCompleteType(Loc, PromiseType, diag::err_incomplete_type))
989  return false;
990 
991  const bool RequiresNoThrowAlloc = ReturnStmtOnAllocFailure != nullptr;
992 
993  // FIXME: Add support for stateful allocators.
994 
995  FunctionDecl *OperatorNew = nullptr;
996  FunctionDecl *OperatorDelete = nullptr;
997  FunctionDecl *UnusedResult = nullptr;
998  bool PassAlignment = false;
999  SmallVector<Expr *, 1> PlacementArgs;
1000 
1002  /*UseGlobal*/ false, PromiseType,
1003  /*isArray*/ false, PassAlignment, PlacementArgs,
1004  OperatorNew, UnusedResult);
1005 
1006  bool IsGlobalOverload =
1007  OperatorNew && !isa<CXXRecordDecl>(OperatorNew->getDeclContext());
1008  // If we didn't find a class-local new declaration and non-throwing new
1009  // was is required then we need to lookup the non-throwing global operator
1010  // instead.
1011  if (RequiresNoThrowAlloc && (!OperatorNew || IsGlobalOverload)) {
1012  auto *StdNoThrow = buildStdNoThrowDeclRef(S, Loc);
1013  if (!StdNoThrow)
1014  return false;
1015  PlacementArgs = {StdNoThrow};
1016  OperatorNew = nullptr;
1018  /*UseGlobal*/ true, PromiseType,
1019  /*isArray*/ false, PassAlignment, PlacementArgs,
1020  OperatorNew, UnusedResult);
1021  }
1022 
1023  assert(OperatorNew && "expected definition of operator new to be found");
1024 
1025  if (RequiresNoThrowAlloc) {
1026  const auto *FT = OperatorNew->getType()->getAs<FunctionProtoType>();
1027  if (!FT->isNothrow(S.Context, /*ResultIfDependent*/ false)) {
1028  S.Diag(OperatorNew->getLocation(),
1029  diag::err_coroutine_promise_new_requires_nothrow)
1030  << OperatorNew;
1031  S.Diag(Loc, diag::note_coroutine_promise_call_implicitly_required)
1032  << OperatorNew;
1033  return false;
1034  }
1035  }
1036 
1037  if ((OperatorDelete = findDeleteForPromise(S, Loc, PromiseType)) == nullptr)
1038  return false;
1039 
1040  Expr *FramePtr =
1041  buildBuiltinCall(S, Loc, Builtin::BI__builtin_coro_frame, {});
1042 
1043  Expr *FrameSize =
1044  buildBuiltinCall(S, Loc, Builtin::BI__builtin_coro_size, {});
1045 
1046  // Make new call.
1047 
1048  ExprResult NewRef =
1049  S.BuildDeclRefExpr(OperatorNew, OperatorNew->getType(), VK_LValue, Loc);
1050  if (NewRef.isInvalid())
1051  return false;
1052 
1053  SmallVector<Expr *, 2> NewArgs(1, FrameSize);
1054  for (auto Arg : PlacementArgs)
1055  NewArgs.push_back(Arg);
1056 
1057  ExprResult NewExpr =
1058  S.ActOnCallExpr(S.getCurScope(), NewRef.get(), Loc, NewArgs, Loc);
1059  NewExpr = S.ActOnFinishFullExpr(NewExpr.get());
1060  if (NewExpr.isInvalid())
1061  return false;
1062 
1063  // Make delete call.
1064 
1065  QualType OpDeleteQualType = OperatorDelete->getType();
1066 
1067  ExprResult DeleteRef =
1068  S.BuildDeclRefExpr(OperatorDelete, OpDeleteQualType, VK_LValue, Loc);
1069  if (DeleteRef.isInvalid())
1070  return false;
1071 
1072  Expr *CoroFree =
1073  buildBuiltinCall(S, Loc, Builtin::BI__builtin_coro_free, {FramePtr});
1074 
1075  SmallVector<Expr *, 2> DeleteArgs{CoroFree};
1076 
1077  // Check if we need to pass the size.
1078  const auto *OpDeleteType =
1079  OpDeleteQualType.getTypePtr()->getAs<FunctionProtoType>();
1080  if (OpDeleteType->getNumParams() > 1)
1081  DeleteArgs.push_back(FrameSize);
1082 
1083  ExprResult DeleteExpr =
1084  S.ActOnCallExpr(S.getCurScope(), DeleteRef.get(), Loc, DeleteArgs, Loc);
1085  DeleteExpr = S.ActOnFinishFullExpr(DeleteExpr.get());
1086  if (DeleteExpr.isInvalid())
1087  return false;
1088 
1089  this->Allocate = NewExpr.get();
1090  this->Deallocate = DeleteExpr.get();
1091 
1092  return true;
1093 }
1094 
1095 bool CoroutineStmtBuilder::makeOnFallthrough() {
1096  assert(!IsPromiseDependentType &&
1097  "cannot make statement while the promise type is dependent");
1098 
1099  // [dcl.fct.def.coroutine]/4
1100  // The unqualified-ids 'return_void' and 'return_value' are looked up in
1101  // the scope of class P. If both are found, the program is ill-formed.
1102  bool HasRVoid, HasRValue;
1103  LookupResult LRVoid =
1104  lookupMember(S, "return_void", PromiseRecordDecl, Loc, HasRVoid);
1105  LookupResult LRValue =
1106  lookupMember(S, "return_value", PromiseRecordDecl, Loc, HasRValue);
1107 
1108  StmtResult Fallthrough;
1109  if (HasRVoid && HasRValue) {
1110  // FIXME Improve this diagnostic
1111  S.Diag(FD.getLocation(),
1112  diag::err_coroutine_promise_incompatible_return_functions)
1113  << PromiseRecordDecl;
1114  S.Diag(LRVoid.getRepresentativeDecl()->getLocation(),
1115  diag::note_member_first_declared_here)
1116  << LRVoid.getLookupName();
1117  S.Diag(LRValue.getRepresentativeDecl()->getLocation(),
1118  diag::note_member_first_declared_here)
1119  << LRValue.getLookupName();
1120  return false;
1121  } else if (!HasRVoid && !HasRValue) {
1122  // FIXME: The PDTS currently specifies this case as UB, not ill-formed.
1123  // However we still diagnose this as an error since until the PDTS is fixed.
1124  S.Diag(FD.getLocation(),
1125  diag::err_coroutine_promise_requires_return_function)
1126  << PromiseRecordDecl;
1127  S.Diag(PromiseRecordDecl->getLocation(), diag::note_defined_here)
1128  << PromiseRecordDecl;
1129  return false;
1130  } else if (HasRVoid) {
1131  // If the unqualified-id return_void is found, flowing off the end of a
1132  // coroutine is equivalent to a co_return with no operand. Otherwise,
1133  // flowing off the end of a coroutine results in undefined behavior.
1134  Fallthrough = S.BuildCoreturnStmt(FD.getLocation(), nullptr,
1135  /*IsImplicit*/false);
1136  Fallthrough = S.ActOnFinishFullStmt(Fallthrough.get());
1137  if (Fallthrough.isInvalid())
1138  return false;
1139  }
1140 
1141  this->OnFallthrough = Fallthrough.get();
1142  return true;
1143 }
1144 
1145 bool CoroutineStmtBuilder::makeOnException() {
1146  // Try to form 'p.unhandled_exception();'
1147  assert(!IsPromiseDependentType &&
1148  "cannot make statement while the promise type is dependent");
1149 
1150  const bool RequireUnhandledException = S.getLangOpts().CXXExceptions;
1151 
1152  if (!lookupMember(S, "unhandled_exception", PromiseRecordDecl, Loc)) {
1153  auto DiagID =
1154  RequireUnhandledException
1155  ? diag::err_coroutine_promise_unhandled_exception_required
1156  : diag::
1157  warn_coroutine_promise_unhandled_exception_required_with_exceptions;
1158  S.Diag(Loc, DiagID) << PromiseRecordDecl;
1159  S.Diag(PromiseRecordDecl->getLocation(), diag::note_defined_here)
1160  << PromiseRecordDecl;
1161  return !RequireUnhandledException;
1162  }
1163 
1164  // If exceptions are disabled, don't try to build OnException.
1165  if (!S.getLangOpts().CXXExceptions)
1166  return true;
1167 
1168  ExprResult UnhandledException = buildPromiseCall(S, Fn.CoroutinePromise, Loc,
1169  "unhandled_exception", None);
1170  UnhandledException = S.ActOnFinishFullExpr(UnhandledException.get(), Loc);
1171  if (UnhandledException.isInvalid())
1172  return false;
1173 
1174  // Since the body of the coroutine will be wrapped in try-catch, it will
1175  // be incompatible with SEH __try if present in a function.
1176  if (!S.getLangOpts().Borland && Fn.FirstSEHTryLoc.isValid()) {
1177  S.Diag(Fn.FirstSEHTryLoc, diag::err_seh_in_a_coroutine_with_cxx_exceptions);
1178  S.Diag(Fn.FirstCoroutineStmtLoc, diag::note_declared_coroutine_here)
1180  return false;
1181  }
1182 
1183  this->OnException = UnhandledException.get();
1184  return true;
1185 }
1186 
1187 bool CoroutineStmtBuilder::makeReturnObject() {
1188  // Build implicit 'p.get_return_object()' expression and form initialization
1189  // of return type from it.
1190  ExprResult ReturnObject =
1191  buildPromiseCall(S, Fn.CoroutinePromise, Loc, "get_return_object", None);
1192  if (ReturnObject.isInvalid())
1193  return false;
1194 
1195  this->ReturnValue = ReturnObject.get();
1196  return true;
1197 }
1198 
1200  if (auto *MbrRef = dyn_cast<CXXMemberCallExpr>(E)) {
1201  auto *MethodDecl = MbrRef->getMethodDecl();
1202  S.Diag(MethodDecl->getLocation(), diag::note_member_declared_here)
1203  << MethodDecl;
1204  }
1205  S.Diag(Fn.FirstCoroutineStmtLoc, diag::note_declared_coroutine_here)
1207 }
1208 
1209 bool CoroutineStmtBuilder::makeGroDeclAndReturnStmt() {
1210  assert(!IsPromiseDependentType &&
1211  "cannot make statement while the promise type is dependent");
1212  assert(this->ReturnValue && "ReturnValue must be already formed");
1213 
1214  QualType const GroType = this->ReturnValue->getType();
1215  assert(!GroType->isDependentType() &&
1216  "get_return_object type must no longer be dependent");
1217 
1218  QualType const FnRetType = FD.getReturnType();
1219  assert(!FnRetType->isDependentType() &&
1220  "get_return_object type must no longer be dependent");
1221 
1222  if (FnRetType->isVoidType()) {
1223  ExprResult Res = S.ActOnFinishFullExpr(this->ReturnValue, Loc);
1224  if (Res.isInvalid())
1225  return false;
1226 
1227  this->ResultDecl = Res.get();
1228  return true;
1229  }
1230 
1231  if (GroType->isVoidType()) {
1232  // Trigger a nice error message.
1233  InitializedEntity Entity =
1234  InitializedEntity::InitializeResult(Loc, FnRetType, false);
1235  S.PerformMoveOrCopyInitialization(Entity, nullptr, FnRetType, ReturnValue);
1237  return false;
1238  }
1239 
1240  auto *GroDecl = VarDecl::Create(
1241  S.Context, &FD, FD.getLocation(), FD.getLocation(),
1242  &S.PP.getIdentifierTable().get("__coro_gro"), GroType,
1243  S.Context.getTrivialTypeSourceInfo(GroType, Loc), SC_None);
1244 
1245  S.CheckVariableDeclarationType(GroDecl);
1246  if (GroDecl->isInvalidDecl())
1247  return false;
1248 
1250  ExprResult Res = S.PerformMoveOrCopyInitialization(Entity, nullptr, GroType,
1251  this->ReturnValue);
1252  if (Res.isInvalid())
1253  return false;
1254 
1255  Res = S.ActOnFinishFullExpr(Res.get());
1256  if (Res.isInvalid())
1257  return false;
1258 
1259  if (GroType == FnRetType) {
1260  GroDecl->setNRVOVariable(true);
1261  }
1262 
1263  S.AddInitializerToDecl(GroDecl, Res.get(),
1264  /*DirectInit=*/false);
1265 
1266  S.FinalizeDeclaration(GroDecl);
1267 
1268  // Form a declaration statement for the return declaration, so that AST
1269  // visitors can more easily find it.
1270  StmtResult GroDeclStmt =
1271  S.ActOnDeclStmt(S.ConvertDeclToDeclGroup(GroDecl), Loc, Loc);
1272  if (GroDeclStmt.isInvalid())
1273  return false;
1274 
1275  this->ResultDecl = GroDeclStmt.get();
1276 
1277  ExprResult declRef = S.BuildDeclRefExpr(GroDecl, GroType, VK_LValue, Loc);
1278  if (declRef.isInvalid())
1279  return false;
1280 
1281  StmtResult ReturnStmt = S.BuildReturnStmt(Loc, declRef.get());
1282  if (ReturnStmt.isInvalid()) {
1284  return false;
1285  }
1286 
1287  this->ReturnStmt = ReturnStmt.get();
1288  return true;
1289 }
1290 
1291 // Create a static_cast<T&&>(expr).
1293  if (T.isNull())
1294  T = E->getType();
1295  QualType TargetType = S.BuildReferenceType(
1296  T, /*SpelledAsLValue*/ false, SourceLocation(), DeclarationName());
1297  SourceLocation ExprLoc = E->getLocStart();
1298  TypeSourceInfo *TargetLoc =
1299  S.Context.getTrivialTypeSourceInfo(TargetType, ExprLoc);
1300 
1301  return S
1302  .BuildCXXNamedCast(ExprLoc, tok::kw_static_cast, TargetLoc, E,
1303  SourceRange(ExprLoc, ExprLoc), E->getSourceRange())
1304  .get();
1305 }
1306 
1307 
1308 /// \brief Build a variable declaration for move parameter.
1310  IdentifierInfo *II) {
1311  TypeSourceInfo *TInfo = S.Context.getTrivialTypeSourceInfo(Type, Loc);
1312  VarDecl *Decl =
1313  VarDecl::Create(S.Context, S.CurContext, Loc, Loc, II, Type, TInfo, SC_None);
1314  Decl->setImplicit();
1315  return Decl;
1316 }
1317 
1318 bool CoroutineStmtBuilder::makeParamMoves() {
1319  for (auto *paramDecl : FD.parameters()) {
1320  auto Ty = paramDecl->getType();
1321  if (Ty->isDependentType())
1322  continue;
1323 
1324  // No need to copy scalars, llvm will take care of them.
1325  if (Ty->getAsCXXRecordDecl()) {
1326  ExprResult ParamRef =
1327  S.BuildDeclRefExpr(paramDecl, paramDecl->getType(),
1328  ExprValueKind::VK_LValue, Loc); // FIXME: scope?
1329  if (ParamRef.isInvalid())
1330  return false;
1331 
1332  Expr *RCast = castForMoving(S, ParamRef.get());
1333 
1334  auto D = buildVarDecl(S, Loc, Ty, paramDecl->getIdentifier());
1335  S.AddInitializerToDecl(D, RCast, /*DirectInit=*/true);
1336 
1337  // Convert decl to a statement.
1339  if (Stmt.isInvalid())
1340  return false;
1341 
1342  ParamMovesVector.push_back(Stmt.get());
1343  }
1344  }
1345 
1346  // Convert to ArrayRef in CtorArgs structure that builder inherits from.
1347  ParamMoves = ParamMovesVector;
1348  return true;
1349 }
1350 
1352  CoroutineBodyStmt *Res = CoroutineBodyStmt::Create(Context, Args);
1353  if (!Res)
1354  return StmtError();
1355  return Res;
1356 }
NamespaceDecl * lookupStdExperimentalNamespace()
static Expr * buildStdNoThrowDeclRef(Sema &S, SourceLocation Loc)
Look up the std::nothrow object.
static ExprResult buildMemberCall(Sema &S, Expr *Base, SourceLocation Loc, StringRef Name, MultiExprArg Args)
void setImplicit(bool I=true)
Definition: DeclBase.h:552
FunctionDecl - An instance of this class is created to represent a function declaration or definition...
Definition: Decl.h:1698
Represents a &#39;co_await&#39; expression while the type of the promise is dependent.
Definition: ExprCXX.h:4340
bool FindDeallocationFunction(SourceLocation StartLoc, CXXRecordDecl *RD, DeclarationName Name, FunctionDecl *&Operator, bool Diagnose=true)
NamespaceDecl * getStdNamespace() const
static DiagnosticBuilder Diag(DiagnosticsEngine *Diags, const LangOptions &Features, FullSourceLoc TokLoc, const char *TokBegin, const char *TokRangeBegin, const char *TokRangeEnd, unsigned DiagID)
Produce a diagnostic highlighting some portion of a literal.
ExprResult PerformContextuallyConvertToBool(Expr *From)
PerformContextuallyConvertToBool - Perform a contextual conversion of the expression From to bool (C+...
RefQualifierKind getRefQualifier() const
Retrieve the ref-qualifier associated with this function type.
Definition: Type.h:3632
PointerType - C99 6.7.5.1 - Pointer Declarators.
Definition: Type.h:2285
A (possibly-)qualified type.
Definition: Type.h:653
static Expr * maybeTailCall(Sema &S, QualType RetType, Expr *E, SourceLocation Loc)
static VarDecl * buildVarDecl(Sema &S, SourceLocation Loc, QualType Type, IdentifierInfo *II)
Build a variable declaration for move parameter.
IdentifierInfo * getIdentifierInfo(StringRef Name) const
Return information about the specified preprocessor identifier token.
Ordinary name lookup, which finds ordinary names (functions, variables, typedefs, etc...
Definition: Sema.h:2994
bool LookupName(LookupResult &R, Scope *S, bool AllowBuiltinCreation=false)
Perform unqualified name lookup starting from a given scope.
static Expr * castForMoving(Sema &S, Expr *E, QualType T=QualType())
static UnresolvedLookupExpr * Create(const ASTContext &C, CXXRecordDecl *NamingClass, NestedNameSpecifierLoc QualifierLoc, const DeclarationNameInfo &NameInfo, bool ADL, bool Overloaded, UnresolvedSetIterator Begin, UnresolvedSetIterator End)
Definition: ExprCXX.h:2781
Represents a &#39;co_return&#39; statement in the C++ Coroutines TS.
Definition: StmtCXX.h:432
Stmt - This represents one statement.
Definition: Stmt.h:66
bool isSpecificPlaceholderType(unsigned K) const
Test for a specific placeholder type.
Definition: Type.h:6158
QualType getLValueReferenceType(QualType T, bool SpelledAsLValue=true) const
Return the uniqued reference to the type for an lvalue reference to the specified type...
SemaDiagnosticBuilder Diag(SourceLocation Loc, unsigned DiagID)
Emit a diagnostic.
Definition: Sema.h:1270
Decl - This represents one declaration (or definition), e.g.
Definition: DeclBase.h:86
A reference to a name which we were able to look up during parsing but could not resolve to a specifi...
Definition: ExprCXX.h:2736
Scope * TUScope
Translation Unit Scope - useful to Objective-C actions that need to lookup file scope declarations in...
Definition: Sema.h:805
QualType getNonReferenceType() const
If Type is a reference type (e.g., const int&), returns the type that the reference refers to ("const...
Definition: Type.h:5893
The base class of the type hierarchy.
Definition: Type.h:1353
OpaqueValueExpr * OpaqueValue
StringRef getFirstCoroutineStmtKeyword() const
Definition: ScopeInfo.h:403
NamespaceDecl - Represent a C++ namespace.
Definition: Decl.h:506
A container of type source information.
Definition: Decl.h:86
void MarkFunctionReferenced(SourceLocation Loc, FunctionDecl *Func, bool MightBeOdrUse=true)
Mark a function referenced, and check whether it is odr-used (C++ [basic.def.odr]p2, C99 6.9p3)
Definition: SemaExpr.cpp:13852
std::pair< Stmt *, Stmt * > CoroutineSuspends
The initial and final coroutine suspend points.
Definition: ScopeInfo.h:176
Retains information about a function, method, or block that is currently being parsed.
Definition: ScopeInfo.h:82
VarDecl - An instance of this class is created to represent a variable declaration or definition...
Definition: Decl.h:807
bool isStructureType() const
Definition: Type.cpp:403
static NestedNameSpecifier * Create(const ASTContext &Context, NestedNameSpecifier *Prefix, IdentifierInfo *II)
Builds a specifier combining a prefix and an identifier.
DeclarationName getLookupName() const
Gets the name to look up.
Definition: Lookup.h:255
QualType getReturnType() const
Definition: Decl.h:2205
const T * getAs() const
Member-template getAs<specific type>&#39;.
Definition: Type.h:6307
DeclContext * computeDeclContext(QualType T)
Compute the DeclContext that is associated with the given type.
StmtResult BuildCoreturnStmt(SourceLocation KwLoc, Expr *E, bool IsImplicit=false)
bool isAmbiguous() const
Definition: Lookup.h:304
bool isInvalidDecl() const
Definition: DeclBase.h:546
static InitializedEntity InitializeResult(SourceLocation ReturnLoc, QualType Type, bool NRVO)
Create the initialization entity for the result of a function.
static bool diagReturnOnAllocFailure(Sema &S, Expr *E, CXXRecordDecl *PromiseRecordDecl, FunctionScopeInfo &Fn)
Defines the clang::Expr interface and subclasses for C++ expressions.
ExprResult ActOnCallExpr(Scope *S, Expr *Fn, SourceLocation LParenLoc, MultiExprArg ArgExprs, SourceLocation RParenLoc, Expr *ExecConfig=nullptr, bool IsExecConfig=false)
ActOnCallExpr - Handle a call to Fn with the specified array of arguments.
Definition: SemaExpr.cpp:5215
One of these records is kept for each identifier that is lexed.
static ReadySuspendResumeResult buildCoawaitCalls(Sema &S, VarDecl *CoroPromise, SourceLocation Loc, Expr *E)
Build calls to await_ready, await_suspend, and await_resume for a co_await expression.
A C++ nested-name-specifier augmented with source location information.
ArrayRef< QualType > getParamTypes() const
Definition: Type.h:3498
bool ActOnCoroutineBodyStart(Scope *S, SourceLocation KwLoc, StringRef Keyword)
DeclGroupPtrTy ConvertDeclToDeclGroup(Decl *Ptr, Decl *OwnedType=nullptr)
Definition: SemaDecl.cpp:54
QualType getElaboratedType(ElaboratedTypeKeyword Keyword, NestedNameSpecifier *NNS, QualType NamedType) const
static FunctionDecl * findDeleteForPromise(Sema &S, SourceLocation Loc, QualType PromiseType)
bool isReferenceType() const
Definition: Type.h:5956
IdentifierTable & Idents
Definition: ASTContext.h:537
SourceLocation FirstSEHTryLoc
First SEH &#39;__try&#39; statement in the current function.
Definition: ScopeInfo.h:158
An r-value expression (a pr-value in the C++11 taxonomy) produces a temporary value.
Definition: Specifiers.h:107
ArrayRef< ParmVarDecl * > parameters() const
Definition: Decl.h:2164
bool isCompleteType(SourceLocation Loc, QualType T)
Definition: Sema.h:1615
Represents the results of name lookup.
Definition: Lookup.h:32
PtrTy get() const
Definition: Ownership.h:162
ExprResult CreateOverloadedUnaryOp(SourceLocation OpLoc, UnaryOperatorKind Opc, const UnresolvedSetImpl &Fns, Expr *input, bool RequiresADL=true)
Create a unary operation that may resolve to an overloaded operator.
static ExprResult buildOperatorCoawaitCall(Sema &SemaRef, SourceLocation Loc, Expr *E, UnresolvedLookupExpr *Lookup)
Build a call to &#39;operator co_await&#39; if there is a suitable operator for the given expression...
A convenient class for passing around template argument information.
Definition: TemplateBase.h:546
ExprValueKind getValueKind() const
getValueKind - The value kind that this expression produces.
Definition: Expr.h:405
StmtResult StmtError()
Definition: Ownership.h:268
TypeDecl - Represents a declaration of a type.
Definition: Decl.h:2754
static ExprResult buildPromiseCall(Sema &S, VarDecl *Promise, SourceLocation Loc, StringRef Name, MultiExprArg Args)
static QualType lookupPromiseType(Sema &S, const FunctionDecl *FD, SourceLocation KwLoc)
Look up the std::coroutine_traits<...>::promise_type for the given function type. ...
Scope - A scope is a transient data structure that is used while parsing the program.
Definition: Scope.h:39
const Type * getTypePtr() const
Retrieves a pointer to the underlying (unqualified) type.
Definition: Type.h:5720
bool FindAllocationFunctions(SourceLocation StartLoc, SourceRange Range, bool UseGlobal, QualType AllocType, bool IsArray, bool &PassAlignment, MultiExprArg PlaceArgs, FunctionDecl *&OperatorNew, FunctionDecl *&OperatorDelete)
FindAllocationFunctions - Finds the overloads of operator new and delete that are appropriate for the...
void append(iterator I, iterator E)
Represents a C++ nested-name-specifier or a global scope specifier.
Definition: DeclSpec.h:63
void CheckVariableDeclarationType(VarDecl *NewVD)
Definition: SemaDecl.cpp:7223
Preprocessor & PP
Definition: Sema.h:315
static VarDecl * Create(ASTContext &C, DeclContext *DC, SourceLocation StartLoc, SourceLocation IdLoc, IdentifierInfo *Id, QualType T, TypeSourceInfo *TInfo, StorageClass S)
Definition: Decl.cpp:1865
const LangOptions & getLangOpts() const
Definition: Sema.h:1193
bool isUnevaluatedContext() const
Determines whether we are currently in a context that is not evaluated as per C++ [expr] p5...
Definition: Sema.h:7417
ExprResult BuildMemberReferenceExpr(Expr *Base, QualType BaseType, SourceLocation OpLoc, bool IsArrow, CXXScopeSpec &SS, SourceLocation TemplateKWLoc, NamedDecl *FirstQualifierInScope, const DeclarationNameInfo &NameInfo, const TemplateArgumentListInfo *TemplateArgs, const Scope *S, ActOnMemberAccessExtraArgs *ExtraArgs=nullptr)
Member name lookup, which finds the names of class/struct/union members.
Definition: Sema.h:3002
ExprResult BuildDeclarationNameExpr(const CXXScopeSpec &SS, LookupResult &R, bool NeedsADL, bool AcceptInvalidDecl=false)
Definition: SemaExpr.cpp:2719
QualType CheckTemplateIdType(TemplateName Template, SourceLocation TemplateLoc, TemplateArgumentListInfo &TemplateArgs)
Sema - This implements semantic analysis and AST building for C.
Definition: Sema.h:274
StmtResult ActOnDeclStmt(DeclGroupPtrTy Decl, SourceLocation StartLoc, SourceLocation EndLoc)
Definition: SemaStmt.cpp:72
CXXRecordDecl * getAsCXXRecordDecl() const
Retrieves the CXXRecordDecl that this type refers to, either because the type is a RecordType or beca...
Definition: Type.cpp:1590
Represents a prototype with parameter type info, e.g.
Definition: Type.h:3270
StmtResult BuildReturnStmt(SourceLocation ReturnLoc, Expr *RetValExp)
Definition: SemaStmt.cpp:3330
StmtResult ActOnCoreturnStmt(Scope *S, SourceLocation KwLoc, Expr *E)
DeclarationNameTable DeclarationNames
Definition: ASTContext.h:540
const char * getName(unsigned ID) const
Return the identifier name for the specified builtin, e.g.
Definition: Builtins.h:86
TypeSourceInfo * getTrivialTypeSourceInfo(QualType T, SourceLocation Loc=SourceLocation()) const
Allocate a TypeSourceInfo where all locations have been initialized to a given location, which defaults to the empty location.
Scope * getCurScope() const
Retrieve the parser&#39;s current scope.
Definition: Sema.h:10515
Expr - This represents one expression.
Definition: Expr.h:106
int Id
Definition: ASTDiff.cpp:191
const FunctionProtoType * T
const T * castAs() const
Member-template castAs<specific type>.
Definition: Type.h:6370
static InitializedEntity InitializeVariable(VarDecl *Var)
Create the initialization entity for a variable.
StmtResult BuildCoroutineBodyStmt(CoroutineBodyStmt::CtorArgs)
void setInvalidDecl(bool Invalid=true)
setInvalidDecl - Indicates the Decl had a semantic error.
Definition: DeclBase.cpp:132
Defines the clang::Preprocessor interface.
DeclContext * getDeclContext()
Definition: DeclBase.h:425
ExprResult BuildCXXNamedCast(SourceLocation OpLoc, tok::TokenKind Kind, TypeSourceInfo *Ty, Expr *E, SourceRange AngleBrackets, SourceRange Parens)
Definition: SemaCast.cpp:240
static bool IsOverloaded(const UnresolvedSetImpl &Functions)
Represents a C++ template name within the type system.
Definition: TemplateName.h:178
decls_iterator decls_begin() const
Definition: ExprCXX.h:2640
bool RequireCompleteType(SourceLocation Loc, QualType T, TypeDiagnoser &Diagnoser)
Ensure that the type T is a complete type.
Definition: SemaType.cpp:7362
static bool isValidCoroutineContext(Sema &S, SourceLocation Loc, StringRef Keyword)
QualType getType() const
Definition: Expr.h:128
bool buildStatements()
Build the coroutine body statements, including the "promise dependent" statements when the promise ty...
static FunctionScopeInfo * checkCoroutineContext(Sema &S, SourceLocation Loc, StringRef Keyword, bool IsImplicit=false)
Check that this is a context in which a coroutine suspension can appear.
ReturnStmt - This represents a return, optionally of an expression: return; return 4;...
Definition: Stmt.h:1413
static Expr * buildBuiltinCall(Sema &S, SourceLocation Loc, Builtin::ID Id, MultiExprArg CallArgs)
bool isInvalid() const
Definition: Ownership.h:158
bool isUsable() const
Definition: Ownership.h:159
QualType getTypeDeclType(const TypeDecl *Decl, const TypeDecl *PrevDecl=nullptr) const
Return the unique reference to the type for the specified type declaration.
Definition: ASTContext.h:1347
bool isNull() const
Return true if this QualType doesn&#39;t point to a type yet.
Definition: Type.h:719
VarDecl * CoroutinePromise
The promise object for this coroutine, if any.
Definition: ScopeInfo.h:173
ExprResult ActOnFinishFullExpr(Expr *Expr)
Definition: Sema.h:5244
ExprObjectKind getObjectKind() const
getObjectKind - The object kind that this expression produces.
Definition: Expr.h:412
static CoroutineBodyStmt * Create(const ASTContext &C, CtorArgs const &Args)
Definition: StmtCXX.cpp:90
OpaqueValueExpr - An expression referring to an opaque object of a fixed type and value class...
Definition: Expr.h:868
ActionResult - This structure is used while parsing/acting on expressions, stmts, etc...
Definition: Ownership.h:144
Encodes a location in the source.
QualType getReturnType() const
Definition: Type.h:3203
IdentifierInfo & get(StringRef Name)
Return the identifier token info for the specified named identifier.
void FinalizeDeclaration(Decl *D)
FinalizeDeclaration - called by ParseDeclarationAfterDeclarator to perform any semantic actions neces...
Definition: SemaDecl.cpp:11157
FunctionDecl * FindUsualDeallocationFunction(SourceLocation StartLoc, bool CanProvideSize, bool Overaligned, DeclarationName Name)
IdentifierTable & getIdentifierTable()
Definition: Preprocessor.h:819
static QualType lookupCoroutineHandleType(Sema &S, QualType PromiseType, SourceLocation Loc)
Look up the std::experimental::coroutine_handle<PromiseType>.
Represents a static or instance method of a struct/union/class.
Definition: DeclCXX.h:1964
ArrayRef< Stmt * > ParamMoves
Definition: StmtCXX.h:342
SourceLocation FirstCoroutineStmtLoc
First coroutine statement in the current function.
Definition: ScopeInfo.h:149
QualType BuildReferenceType(QualType T, bool LValueRef, SourceLocation Loc, DeclarationName Entity)
Build a reference type.
Definition: SemaType.cpp:1913
An rvalue ref-qualifier was provided (&&).
Definition: Type.h:1312
void addArgument(const TemplateArgumentLoc &Loc)
Definition: TemplateBase.h:586
SourceLocation getExprLoc() const LLVM_READONLY
getExprLoc - Return the preferred location for the arrow when diagnosing a problem with a generic exp...
Definition: Expr.cpp:216
bool isPlaceholderType() const
Test for a type which does not represent an actual type-system type but is instead used as a placehol...
Definition: Type.h:6145
Represents a template argument.
Definition: TemplateBase.h:51
Dataflow Directional Tag Classes.
bool isValid() const
Return true if this is a valid SourceLocation object.
DeclContext - This is used only as base class of specific decl types that can act as declaration cont...
Definition: DeclBase.h:1252
FunctionDecl * getDirectCallee()
If the callee is a FunctionDecl, return it. Otherwise return 0.
Definition: Expr.cpp:1216
CoroutineStmtBuilder(Sema &S, FunctionDecl &FD, sema::FunctionScopeInfo &Fn, Stmt *Body)
Construct a CoroutineStmtBuilder and initialize the promise statement and initial/final suspends from...
Represents a &#39;co_yield&#39; expression.
Definition: ExprCXX.h:4387
DeclarationName - The name of a declaration.
NamedDecl * getFoundDecl() const
Fetch the unique decl found by this lookup.
Definition: Lookup.h:520
bool isBooleanType() const
Definition: Type.h:6234
A set of unresolved declarations.
SourceLocation getLocStart() const LLVM_READONLY
Definition: Decl.h:732
ExprResult BuildUnresolvedCoawaitExpr(SourceLocation KwLoc, Expr *E, UnresolvedLookupExpr *Lookup)
QualType getCallReturnType(const ASTContext &Ctx) const
getCallReturnType - Get the return type of the call expr.
Definition: Expr.cpp:1307
DeclarationNameInfo - A collector data type for bundling together a DeclarationName and the correspnd...
void AddInitializerToDecl(Decl *dcl, Expr *init, bool DirectInit)
AddInitializerToDecl - Adds the initializer Init to the declaration dcl.
Definition: SemaDecl.cpp:10158
static ExprResult buildCoroutineHandle(Sema &S, QualType PromiseType, SourceLocation Loc)
SourceLocation FirstReturnLoc
First &#39;return&#39; statement in the current function.
Definition: ScopeInfo.h:152
Decl * getCalleeDecl()
Definition: Expr.cpp:1220
StmtResult ActOnFinishFullStmt(Stmt *Stmt)
const UnresolvedSetImpl & asUnresolvedSet() const
Definition: Lookup.h:334
Represents the body of a coroutine.
Definition: StmtCXX.h:299
Location wrapper for a TemplateArgument.
Definition: TemplateBase.h:450
ExprResult ActOnCoawaitExpr(Scope *S, SourceLocation KwLoc, Expr *E)
CanQualType DependentTy
Definition: ASTContext.h:1013
Represents a &#39;co_await&#39; expression.
Definition: ExprCXX.h:4304
static ExprResult buildOperatorCoawaitLookupExpr(Sema &SemaRef, Scope *S, SourceLocation Loc)
ActionResult< Stmt * > StmtResult
Definition: Ownership.h:252
ExprResult BuildCoyieldExpr(SourceLocation KwLoc, Expr *E)
ExprResult ActOnCoyieldExpr(Scope *S, SourceLocation KwLoc, Expr *E)
bool isClassType() const
Definition: Type.cpp:397
bool LookupQualifiedName(LookupResult &R, DeclContext *LookupCtx, bool InUnqualifiedLookup=false)
Perform qualified name lookup into a given context.
ExprResult PerformMoveOrCopyInitialization(const InitializedEntity &Entity, const VarDecl *NRVOCandidate, QualType ResultType, Expr *Value, bool AllowNRVO=true)
Perform the initialization of a potentially-movable value, which is the result of return value...
Definition: SemaStmt.cpp:2925
ExprResult BuildDeclRefExpr(ValueDecl *D, QualType Ty, ExprValueKind VK, SourceLocation Loc, const CXXScopeSpec *SS=nullptr)
Definition: SemaExpr.cpp:1637
Represents a C++ struct/union/class.
Definition: DeclCXX.h:299
QualType getRValueReferenceType(QualType T) const
Return the uniqued reference to the type for an rvalue reference to the specified type...
bool isVoidType() const
Definition: Type.h:6171
sema::FunctionScopeInfo * getCurFunction() const
Definition: Sema.h:1320
Builtin::Context & BuiltinInfo
Definition: ASTContext.h:539
DeclContext * CurContext
CurContext - This is the current declaration context of parsing.
Definition: Sema.h:328
Declaration of a class template.
SourceRange getSourceRange() const LLVM_READONLY
SourceLocation tokens are not useful in isolation - they are low level value objects created/interpre...
Definition: Stmt.cpp:265
CallExpr - Represents a function call (C99 6.5.2.2, C++ [expr.call]).
Definition: Expr.h:2209
ExprResult ExprError()
Definition: Ownership.h:267
bool isDependentType() const
Whether this type is a dependent type, meaning that its definition somehow depends on a template para...
Definition: Type.h:1860
bool hasInvalidCoroutineSuspends() const
Definition: ScopeInfo.h:421
void CheckCompletedCoroutineBody(FunctionDecl *FD, Stmt *&Body)
void suppressDiagnostics()
Suppress the diagnostics that would normally fire because of this lookup.
Definition: Lookup.h:586
ExprResult BuildResolvedCoawaitExpr(SourceLocation KwLoc, Expr *E, bool IsImplicit=false)
bool buildDependentStatements()
Build the coroutine body statements that require a non-dependent promise type in order to construct...
QualType getType() const
Definition: Decl.h:639
An l-value expression is a reference to an object with independent storage.
Definition: Specifiers.h:111
A trivial tuple used to represent a source range.
ASTContext & Context
Definition: Sema.h:316
NamedDecl - This represents a decl with a name.
Definition: Decl.h:245
No keyword precedes the qualified type name.
Definition: Type.h:4728
Describes an entity that is being initialized.
Look up of an operator name (e.g., operator+) for use with operator overloading.
Definition: Sema.h:3006
bool buildParameterMoves()
Build just parameter moves. To use for rebuilding in TreeTransform.
NamedDecl * getRepresentativeDecl() const
Fetches a representative decl. Useful for lazy diagnostics.
Definition: Lookup.h:527
SourceLocation getLocStart() const LLVM_READONLY
Definition: Stmt.cpp:277
decls_iterator decls_end() const
Definition: ExprCXX.h:2641
static LookupResult lookupMember(Sema &S, const char *Name, CXXRecordDecl *RD, SourceLocation Loc, bool &Res)
SourceLocation getLocation() const
Definition: DeclBase.h:416
VarDecl * buildCoroutinePromise(SourceLocation Loc)
DeclarationName getCXXOperatorName(OverloadedOperatorKind Op)
getCXXOperatorName - Get the name of the overloadable C++ operator corresponding to Op...
static void noteMemberDeclaredHere(Sema &S, Expr *E, FunctionScopeInfo &Fn)