File: | clang/lib/Sema/SemaCoroutine.cpp |
Warning: | line 680, column 13 Called C++ object pointer is null |
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1 | //===-- SemaCoroutine.cpp - Semantic Analysis for 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 file implements semantic analysis for C++ Coroutines. | |||
10 | // | |||
11 | // This file contains references to sections of the Coroutines TS, which | |||
12 | // can be found at http://wg21.link/coroutines. | |||
13 | // | |||
14 | //===----------------------------------------------------------------------===// | |||
15 | ||||
16 | #include "CoroutineStmtBuilder.h" | |||
17 | #include "clang/AST/ASTLambda.h" | |||
18 | #include "clang/AST/Decl.h" | |||
19 | #include "clang/AST/ExprCXX.h" | |||
20 | #include "clang/AST/StmtCXX.h" | |||
21 | #include "clang/Basic/Builtins.h" | |||
22 | #include "clang/Lex/Preprocessor.h" | |||
23 | #include "clang/Sema/Initialization.h" | |||
24 | #include "clang/Sema/Overload.h" | |||
25 | #include "clang/Sema/ScopeInfo.h" | |||
26 | #include "clang/Sema/SemaInternal.h" | |||
27 | #include "llvm/ADT/SmallSet.h" | |||
28 | ||||
29 | using namespace clang; | |||
30 | using namespace sema; | |||
31 | ||||
32 | static LookupResult lookupMember(Sema &S, const char *Name, CXXRecordDecl *RD, | |||
33 | SourceLocation Loc, bool &Res) { | |||
34 | DeclarationName DN = S.PP.getIdentifierInfo(Name); | |||
35 | LookupResult LR(S, DN, Loc, Sema::LookupMemberName); | |||
36 | // Suppress diagnostics when a private member is selected. The same warnings | |||
37 | // will be produced again when building the call. | |||
38 | LR.suppressDiagnostics(); | |||
39 | Res = S.LookupQualifiedName(LR, RD); | |||
40 | return LR; | |||
41 | } | |||
42 | ||||
43 | static bool lookupMember(Sema &S, const char *Name, CXXRecordDecl *RD, | |||
44 | SourceLocation Loc) { | |||
45 | bool Res; | |||
46 | lookupMember(S, Name, RD, Loc, Res); | |||
47 | return Res; | |||
48 | } | |||
49 | ||||
50 | /// Look up the std::coroutine_traits<...>::promise_type for the given | |||
51 | /// function type. | |||
52 | static QualType lookupPromiseType(Sema &S, const FunctionDecl *FD, | |||
53 | SourceLocation KwLoc) { | |||
54 | const FunctionProtoType *FnType = FD->getType()->castAs<FunctionProtoType>(); | |||
55 | const SourceLocation FuncLoc = FD->getLocation(); | |||
56 | // FIXME: Cache std::coroutine_traits once we've found it. | |||
57 | NamespaceDecl *StdExp = S.lookupStdExperimentalNamespace(); | |||
58 | if (!StdExp) { | |||
59 | S.Diag(KwLoc, diag::err_implied_coroutine_type_not_found) | |||
60 | << "std::experimental::coroutine_traits"; | |||
61 | return QualType(); | |||
62 | } | |||
63 | ||||
64 | ClassTemplateDecl *CoroTraits = S.lookupCoroutineTraits(KwLoc, FuncLoc); | |||
65 | if (!CoroTraits) { | |||
66 | return QualType(); | |||
67 | } | |||
68 | ||||
69 | // Form template argument list for coroutine_traits<R, P1, P2, ...> according | |||
70 | // to [dcl.fct.def.coroutine]3 | |||
71 | TemplateArgumentListInfo Args(KwLoc, KwLoc); | |||
72 | auto AddArg = [&](QualType T) { | |||
73 | Args.addArgument(TemplateArgumentLoc( | |||
74 | TemplateArgument(T), S.Context.getTrivialTypeSourceInfo(T, KwLoc))); | |||
75 | }; | |||
76 | AddArg(FnType->getReturnType()); | |||
77 | // If the function is a non-static member function, add the type | |||
78 | // of the implicit object parameter before the formal parameters. | |||
79 | if (auto *MD = dyn_cast<CXXMethodDecl>(FD)) { | |||
80 | if (MD->isInstance()) { | |||
81 | // [over.match.funcs]4 | |||
82 | // For non-static member functions, the type of the implicit object | |||
83 | // parameter is | |||
84 | // -- "lvalue reference to cv X" for functions declared without a | |||
85 | // ref-qualifier or with the & ref-qualifier | |||
86 | // -- "rvalue reference to cv X" for functions declared with the && | |||
87 | // ref-qualifier | |||
88 | QualType T = MD->getThisType()->castAs<PointerType>()->getPointeeType(); | |||
89 | T = FnType->getRefQualifier() == RQ_RValue | |||
90 | ? S.Context.getRValueReferenceType(T) | |||
91 | : S.Context.getLValueReferenceType(T, /*SpelledAsLValue*/ true); | |||
92 | AddArg(T); | |||
93 | } | |||
94 | } | |||
95 | for (QualType T : FnType->getParamTypes()) | |||
96 | AddArg(T); | |||
97 | ||||
98 | // Build the template-id. | |||
99 | QualType CoroTrait = | |||
100 | S.CheckTemplateIdType(TemplateName(CoroTraits), KwLoc, Args); | |||
101 | if (CoroTrait.isNull()) | |||
102 | return QualType(); | |||
103 | if (S.RequireCompleteType(KwLoc, CoroTrait, | |||
104 | diag::err_coroutine_type_missing_specialization)) | |||
105 | return QualType(); | |||
106 | ||||
107 | auto *RD = CoroTrait->getAsCXXRecordDecl(); | |||
108 | assert(RD && "specialization of class template is not a class?")(static_cast <bool> (RD && "specialization of class template is not a class?" ) ? void (0) : __assert_fail ("RD && \"specialization of class template is not a class?\"" , "/build/llvm-toolchain-snapshot-14~++20210828111110+16086d47c0d0/clang/lib/Sema/SemaCoroutine.cpp" , 108, __extension__ __PRETTY_FUNCTION__)); | |||
109 | ||||
110 | // Look up the ::promise_type member. | |||
111 | LookupResult R(S, &S.PP.getIdentifierTable().get("promise_type"), KwLoc, | |||
112 | Sema::LookupOrdinaryName); | |||
113 | S.LookupQualifiedName(R, RD); | |||
114 | auto *Promise = R.getAsSingle<TypeDecl>(); | |||
115 | if (!Promise) { | |||
116 | S.Diag(FuncLoc, | |||
117 | diag::err_implied_std_coroutine_traits_promise_type_not_found) | |||
118 | << RD; | |||
119 | return QualType(); | |||
120 | } | |||
121 | // The promise type is required to be a class type. | |||
122 | QualType PromiseType = S.Context.getTypeDeclType(Promise); | |||
123 | ||||
124 | auto buildElaboratedType = [&]() { | |||
125 | auto *NNS = NestedNameSpecifier::Create(S.Context, nullptr, StdExp); | |||
126 | NNS = NestedNameSpecifier::Create(S.Context, NNS, false, | |||
127 | CoroTrait.getTypePtr()); | |||
128 | return S.Context.getElaboratedType(ETK_None, NNS, PromiseType); | |||
129 | }; | |||
130 | ||||
131 | if (!PromiseType->getAsCXXRecordDecl()) { | |||
132 | S.Diag(FuncLoc, | |||
133 | diag::err_implied_std_coroutine_traits_promise_type_not_class) | |||
134 | << buildElaboratedType(); | |||
135 | return QualType(); | |||
136 | } | |||
137 | if (S.RequireCompleteType(FuncLoc, buildElaboratedType(), | |||
138 | diag::err_coroutine_promise_type_incomplete)) | |||
139 | return QualType(); | |||
140 | ||||
141 | return PromiseType; | |||
142 | } | |||
143 | ||||
144 | /// Look up the std::experimental::coroutine_handle<PromiseType>. | |||
145 | static QualType lookupCoroutineHandleType(Sema &S, QualType PromiseType, | |||
146 | SourceLocation Loc) { | |||
147 | if (PromiseType.isNull()) | |||
148 | return QualType(); | |||
149 | ||||
150 | NamespaceDecl *StdExp = S.lookupStdExperimentalNamespace(); | |||
151 | assert(StdExp && "Should already be diagnosed")(static_cast <bool> (StdExp && "Should already be diagnosed" ) ? void (0) : __assert_fail ("StdExp && \"Should already be diagnosed\"" , "/build/llvm-toolchain-snapshot-14~++20210828111110+16086d47c0d0/clang/lib/Sema/SemaCoroutine.cpp" , 151, __extension__ __PRETTY_FUNCTION__)); | |||
152 | ||||
153 | LookupResult Result(S, &S.PP.getIdentifierTable().get("coroutine_handle"), | |||
154 | Loc, Sema::LookupOrdinaryName); | |||
155 | if (!S.LookupQualifiedName(Result, StdExp)) { | |||
156 | S.Diag(Loc, diag::err_implied_coroutine_type_not_found) | |||
157 | << "std::experimental::coroutine_handle"; | |||
158 | return QualType(); | |||
159 | } | |||
160 | ||||
161 | ClassTemplateDecl *CoroHandle = Result.getAsSingle<ClassTemplateDecl>(); | |||
162 | if (!CoroHandle) { | |||
163 | Result.suppressDiagnostics(); | |||
164 | // We found something weird. Complain about the first thing we found. | |||
165 | NamedDecl *Found = *Result.begin(); | |||
166 | S.Diag(Found->getLocation(), diag::err_malformed_std_coroutine_handle); | |||
167 | return QualType(); | |||
168 | } | |||
169 | ||||
170 | // Form template argument list for coroutine_handle<Promise>. | |||
171 | TemplateArgumentListInfo Args(Loc, Loc); | |||
172 | Args.addArgument(TemplateArgumentLoc( | |||
173 | TemplateArgument(PromiseType), | |||
174 | S.Context.getTrivialTypeSourceInfo(PromiseType, Loc))); | |||
175 | ||||
176 | // Build the template-id. | |||
177 | QualType CoroHandleType = | |||
178 | S.CheckTemplateIdType(TemplateName(CoroHandle), Loc, Args); | |||
179 | if (CoroHandleType.isNull()) | |||
180 | return QualType(); | |||
181 | if (S.RequireCompleteType(Loc, CoroHandleType, | |||
182 | diag::err_coroutine_type_missing_specialization)) | |||
183 | return QualType(); | |||
184 | ||||
185 | return CoroHandleType; | |||
186 | } | |||
187 | ||||
188 | static bool isValidCoroutineContext(Sema &S, SourceLocation Loc, | |||
189 | StringRef Keyword) { | |||
190 | // [expr.await]p2 dictates that 'co_await' and 'co_yield' must be used within | |||
191 | // a function body. | |||
192 | // FIXME: This also covers [expr.await]p2: "An await-expression shall not | |||
193 | // appear in a default argument." But the diagnostic QoI here could be | |||
194 | // improved to inform the user that default arguments specifically are not | |||
195 | // allowed. | |||
196 | auto *FD = dyn_cast<FunctionDecl>(S.CurContext); | |||
197 | if (!FD) { | |||
198 | S.Diag(Loc, isa<ObjCMethodDecl>(S.CurContext) | |||
199 | ? diag::err_coroutine_objc_method | |||
200 | : diag::err_coroutine_outside_function) << Keyword; | |||
201 | return false; | |||
202 | } | |||
203 | ||||
204 | // An enumeration for mapping the diagnostic type to the correct diagnostic | |||
205 | // selection index. | |||
206 | enum InvalidFuncDiag { | |||
207 | DiagCtor = 0, | |||
208 | DiagDtor, | |||
209 | DiagMain, | |||
210 | DiagConstexpr, | |||
211 | DiagAutoRet, | |||
212 | DiagVarargs, | |||
213 | DiagConsteval, | |||
214 | }; | |||
215 | bool Diagnosed = false; | |||
216 | auto DiagInvalid = [&](InvalidFuncDiag ID) { | |||
217 | S.Diag(Loc, diag::err_coroutine_invalid_func_context) << ID << Keyword; | |||
218 | Diagnosed = true; | |||
219 | return false; | |||
220 | }; | |||
221 | ||||
222 | // Diagnose when a constructor, destructor | |||
223 | // or the function 'main' are declared as a coroutine. | |||
224 | auto *MD = dyn_cast<CXXMethodDecl>(FD); | |||
225 | // [class.ctor]p11: "A constructor shall not be a coroutine." | |||
226 | if (MD && isa<CXXConstructorDecl>(MD)) | |||
227 | return DiagInvalid(DiagCtor); | |||
228 | // [class.dtor]p17: "A destructor shall not be a coroutine." | |||
229 | else if (MD && isa<CXXDestructorDecl>(MD)) | |||
230 | return DiagInvalid(DiagDtor); | |||
231 | // [basic.start.main]p3: "The function main shall not be a coroutine." | |||
232 | else if (FD->isMain()) | |||
233 | return DiagInvalid(DiagMain); | |||
234 | ||||
235 | // Emit a diagnostics for each of the following conditions which is not met. | |||
236 | // [expr.const]p2: "An expression e is a core constant expression unless the | |||
237 | // evaluation of e [...] would evaluate one of the following expressions: | |||
238 | // [...] an await-expression [...] a yield-expression." | |||
239 | if (FD->isConstexpr()) | |||
240 | DiagInvalid(FD->isConsteval() ? DiagConsteval : DiagConstexpr); | |||
241 | // [dcl.spec.auto]p15: "A function declared with a return type that uses a | |||
242 | // placeholder type shall not be a coroutine." | |||
243 | if (FD->getReturnType()->isUndeducedType()) | |||
244 | DiagInvalid(DiagAutoRet); | |||
245 | // [dcl.fct.def.coroutine]p1: "The parameter-declaration-clause of the | |||
246 | // coroutine shall not terminate with an ellipsis that is not part of a | |||
247 | // parameter-declaration." | |||
248 | if (FD->isVariadic()) | |||
249 | DiagInvalid(DiagVarargs); | |||
250 | ||||
251 | return !Diagnosed; | |||
252 | } | |||
253 | ||||
254 | static ExprResult buildOperatorCoawaitLookupExpr(Sema &SemaRef, Scope *S, | |||
255 | SourceLocation Loc) { | |||
256 | DeclarationName OpName = | |||
257 | SemaRef.Context.DeclarationNames.getCXXOperatorName(OO_Coawait); | |||
258 | LookupResult Operators(SemaRef, OpName, SourceLocation(), | |||
259 | Sema::LookupOperatorName); | |||
260 | SemaRef.LookupName(Operators, S); | |||
261 | ||||
262 | assert(!Operators.isAmbiguous() && "Operator lookup cannot be ambiguous")(static_cast <bool> (!Operators.isAmbiguous() && "Operator lookup cannot be ambiguous") ? void (0) : __assert_fail ("!Operators.isAmbiguous() && \"Operator lookup cannot be ambiguous\"" , "/build/llvm-toolchain-snapshot-14~++20210828111110+16086d47c0d0/clang/lib/Sema/SemaCoroutine.cpp" , 262, __extension__ __PRETTY_FUNCTION__)); | |||
263 | const auto &Functions = Operators.asUnresolvedSet(); | |||
264 | bool IsOverloaded = | |||
265 | Functions.size() > 1 || | |||
266 | (Functions.size() == 1 && isa<FunctionTemplateDecl>(*Functions.begin())); | |||
267 | Expr *CoawaitOp = UnresolvedLookupExpr::Create( | |||
268 | SemaRef.Context, /*NamingClass*/ nullptr, NestedNameSpecifierLoc(), | |||
269 | DeclarationNameInfo(OpName, Loc), /*RequiresADL*/ true, IsOverloaded, | |||
270 | Functions.begin(), Functions.end()); | |||
271 | assert(CoawaitOp)(static_cast <bool> (CoawaitOp) ? void (0) : __assert_fail ("CoawaitOp", "/build/llvm-toolchain-snapshot-14~++20210828111110+16086d47c0d0/clang/lib/Sema/SemaCoroutine.cpp" , 271, __extension__ __PRETTY_FUNCTION__)); | |||
272 | return CoawaitOp; | |||
273 | } | |||
274 | ||||
275 | /// Build a call to 'operator co_await' if there is a suitable operator for | |||
276 | /// the given expression. | |||
277 | static ExprResult buildOperatorCoawaitCall(Sema &SemaRef, SourceLocation Loc, | |||
278 | Expr *E, | |||
279 | UnresolvedLookupExpr *Lookup) { | |||
280 | UnresolvedSet<16> Functions; | |||
281 | Functions.append(Lookup->decls_begin(), Lookup->decls_end()); | |||
282 | return SemaRef.CreateOverloadedUnaryOp(Loc, UO_Coawait, Functions, E); | |||
283 | } | |||
284 | ||||
285 | static ExprResult buildOperatorCoawaitCall(Sema &SemaRef, Scope *S, | |||
286 | SourceLocation Loc, Expr *E) { | |||
287 | ExprResult R = buildOperatorCoawaitLookupExpr(SemaRef, S, Loc); | |||
288 | if (R.isInvalid()) | |||
289 | return ExprError(); | |||
290 | return buildOperatorCoawaitCall(SemaRef, Loc, E, | |||
291 | cast<UnresolvedLookupExpr>(R.get())); | |||
292 | } | |||
293 | ||||
294 | static ExprResult buildCoroutineHandle(Sema &S, QualType PromiseType, | |||
295 | SourceLocation Loc) { | |||
296 | QualType CoroHandleType = lookupCoroutineHandleType(S, PromiseType, Loc); | |||
297 | if (CoroHandleType.isNull()) | |||
298 | return ExprError(); | |||
299 | ||||
300 | DeclContext *LookupCtx = S.computeDeclContext(CoroHandleType); | |||
301 | LookupResult Found(S, &S.PP.getIdentifierTable().get("from_address"), Loc, | |||
302 | Sema::LookupOrdinaryName); | |||
303 | if (!S.LookupQualifiedName(Found, LookupCtx)) { | |||
304 | S.Diag(Loc, diag::err_coroutine_handle_missing_member) | |||
305 | << "from_address"; | |||
306 | return ExprError(); | |||
307 | } | |||
308 | ||||
309 | Expr *FramePtr = | |||
310 | S.BuildBuiltinCallExpr(Loc, Builtin::BI__builtin_coro_frame, {}); | |||
311 | ||||
312 | CXXScopeSpec SS; | |||
313 | ExprResult FromAddr = | |||
314 | S.BuildDeclarationNameExpr(SS, Found, /*NeedsADL=*/false); | |||
315 | if (FromAddr.isInvalid()) | |||
316 | return ExprError(); | |||
317 | ||||
318 | return S.BuildCallExpr(nullptr, FromAddr.get(), Loc, FramePtr, Loc); | |||
319 | } | |||
320 | ||||
321 | struct ReadySuspendResumeResult { | |||
322 | enum AwaitCallType { ACT_Ready, ACT_Suspend, ACT_Resume }; | |||
323 | Expr *Results[3]; | |||
324 | OpaqueValueExpr *OpaqueValue; | |||
325 | bool IsInvalid; | |||
326 | }; | |||
327 | ||||
328 | static ExprResult buildMemberCall(Sema &S, Expr *Base, SourceLocation Loc, | |||
329 | StringRef Name, MultiExprArg Args) { | |||
330 | DeclarationNameInfo NameInfo(&S.PP.getIdentifierTable().get(Name), Loc); | |||
331 | ||||
332 | // FIXME: Fix BuildMemberReferenceExpr to take a const CXXScopeSpec&. | |||
333 | CXXScopeSpec SS; | |||
334 | ExprResult Result = S.BuildMemberReferenceExpr( | |||
335 | Base, Base->getType(), Loc, /*IsPtr=*/false, SS, | |||
336 | SourceLocation(), nullptr, NameInfo, /*TemplateArgs=*/nullptr, | |||
337 | /*Scope=*/nullptr); | |||
338 | if (Result.isInvalid()) | |||
339 | return ExprError(); | |||
340 | ||||
341 | // We meant exactly what we asked for. No need for typo correction. | |||
342 | if (auto *TE = dyn_cast<TypoExpr>(Result.get())) { | |||
343 | S.clearDelayedTypo(TE); | |||
344 | S.Diag(Loc, diag::err_no_member) | |||
345 | << NameInfo.getName() << Base->getType()->getAsCXXRecordDecl() | |||
346 | << Base->getSourceRange(); | |||
347 | return ExprError(); | |||
348 | } | |||
349 | ||||
350 | return S.BuildCallExpr(nullptr, Result.get(), Loc, Args, Loc, nullptr); | |||
351 | } | |||
352 | ||||
353 | // See if return type is coroutine-handle and if so, invoke builtin coro-resume | |||
354 | // on its address. This is to enable experimental support for coroutine-handle | |||
355 | // returning await_suspend that results in a guaranteed tail call to the target | |||
356 | // coroutine. | |||
357 | static Expr *maybeTailCall(Sema &S, QualType RetType, Expr *E, | |||
358 | SourceLocation Loc) { | |||
359 | if (RetType->isReferenceType()) | |||
360 | return nullptr; | |||
361 | Type const *T = RetType.getTypePtr(); | |||
362 | if (!T->isClassType() && !T->isStructureType()) | |||
363 | return nullptr; | |||
364 | ||||
365 | // FIXME: Add convertability check to coroutine_handle<>. Possibly via | |||
366 | // EvaluateBinaryTypeTrait(BTT_IsConvertible, ...) which is at the moment | |||
367 | // a private function in SemaExprCXX.cpp | |||
368 | ||||
369 | ExprResult AddressExpr = buildMemberCall(S, E, Loc, "address", None); | |||
370 | if (AddressExpr.isInvalid()) | |||
371 | return nullptr; | |||
372 | ||||
373 | Expr *JustAddress = AddressExpr.get(); | |||
374 | ||||
375 | // Check that the type of AddressExpr is void* | |||
376 | if (!JustAddress->getType().getTypePtr()->isVoidPointerType()) | |||
377 | S.Diag(cast<CallExpr>(JustAddress)->getCalleeDecl()->getLocation(), | |||
378 | diag::warn_coroutine_handle_address_invalid_return_type) | |||
379 | << JustAddress->getType(); | |||
380 | ||||
381 | // Clean up temporary objects so that they don't live across suspension points | |||
382 | // unnecessarily. We choose to clean up before the call to | |||
383 | // __builtin_coro_resume so that the cleanup code are not inserted in-between | |||
384 | // the resume call and return instruction, which would interfere with the | |||
385 | // musttail call contract. | |||
386 | JustAddress = S.MaybeCreateExprWithCleanups(JustAddress); | |||
387 | return S.BuildBuiltinCallExpr(Loc, Builtin::BI__builtin_coro_resume, | |||
388 | JustAddress); | |||
389 | } | |||
390 | ||||
391 | /// Build calls to await_ready, await_suspend, and await_resume for a co_await | |||
392 | /// expression. | |||
393 | /// The generated AST tries to clean up temporary objects as early as | |||
394 | /// possible so that they don't live across suspension points if possible. | |||
395 | /// Having temporary objects living across suspension points unnecessarily can | |||
396 | /// lead to large frame size, and also lead to memory corruptions if the | |||
397 | /// coroutine frame is destroyed after coming back from suspension. This is done | |||
398 | /// by wrapping both the await_ready call and the await_suspend call with | |||
399 | /// ExprWithCleanups. In the end of this function, we also need to explicitly | |||
400 | /// set cleanup state so that the CoawaitExpr is also wrapped with an | |||
401 | /// ExprWithCleanups to clean up the awaiter associated with the co_await | |||
402 | /// expression. | |||
403 | static ReadySuspendResumeResult buildCoawaitCalls(Sema &S, VarDecl *CoroPromise, | |||
404 | SourceLocation Loc, Expr *E) { | |||
405 | OpaqueValueExpr *Operand = new (S.Context) | |||
406 | OpaqueValueExpr(Loc, E->getType(), VK_LValue, E->getObjectKind(), E); | |||
407 | ||||
408 | // Assume valid until we see otherwise. | |||
409 | // Further operations are responsible for setting IsInalid to true. | |||
410 | ReadySuspendResumeResult Calls = {{}, Operand, /*IsInvalid=*/false}; | |||
411 | ||||
412 | using ACT = ReadySuspendResumeResult::AwaitCallType; | |||
413 | ||||
414 | auto BuildSubExpr = [&](ACT CallType, StringRef Func, | |||
415 | MultiExprArg Arg) -> Expr * { | |||
416 | ExprResult Result = buildMemberCall(S, Operand, Loc, Func, Arg); | |||
417 | if (Result.isInvalid()) { | |||
418 | Calls.IsInvalid = true; | |||
419 | return nullptr; | |||
420 | } | |||
421 | Calls.Results[CallType] = Result.get(); | |||
422 | return Result.get(); | |||
423 | }; | |||
424 | ||||
425 | CallExpr *AwaitReady = | |||
426 | cast_or_null<CallExpr>(BuildSubExpr(ACT::ACT_Ready, "await_ready", None)); | |||
427 | if (!AwaitReady) | |||
428 | return Calls; | |||
429 | if (!AwaitReady->getType()->isDependentType()) { | |||
430 | // [expr.await]p3 [...] | |||
431 | // — await-ready is the expression e.await_ready(), contextually converted | |||
432 | // to bool. | |||
433 | ExprResult Conv = S.PerformContextuallyConvertToBool(AwaitReady); | |||
434 | if (Conv.isInvalid()) { | |||
435 | S.Diag(AwaitReady->getDirectCallee()->getBeginLoc(), | |||
436 | diag::note_await_ready_no_bool_conversion); | |||
437 | S.Diag(Loc, diag::note_coroutine_promise_call_implicitly_required) | |||
438 | << AwaitReady->getDirectCallee() << E->getSourceRange(); | |||
439 | Calls.IsInvalid = true; | |||
440 | } else | |||
441 | Calls.Results[ACT::ACT_Ready] = S.MaybeCreateExprWithCleanups(Conv.get()); | |||
442 | } | |||
443 | ||||
444 | ExprResult CoroHandleRes = | |||
445 | buildCoroutineHandle(S, CoroPromise->getType(), Loc); | |||
446 | if (CoroHandleRes.isInvalid()) { | |||
447 | Calls.IsInvalid = true; | |||
448 | return Calls; | |||
449 | } | |||
450 | Expr *CoroHandle = CoroHandleRes.get(); | |||
451 | CallExpr *AwaitSuspend = cast_or_null<CallExpr>( | |||
452 | BuildSubExpr(ACT::ACT_Suspend, "await_suspend", CoroHandle)); | |||
453 | if (!AwaitSuspend) | |||
454 | return Calls; | |||
455 | if (!AwaitSuspend->getType()->isDependentType()) { | |||
456 | // [expr.await]p3 [...] | |||
457 | // - await-suspend is the expression e.await_suspend(h), which shall be | |||
458 | // a prvalue of type void, bool, or std::coroutine_handle<Z> for some | |||
459 | // type Z. | |||
460 | QualType RetType = AwaitSuspend->getCallReturnType(S.Context); | |||
461 | ||||
462 | // Experimental support for coroutine_handle returning await_suspend. | |||
463 | if (Expr *TailCallSuspend = | |||
464 | maybeTailCall(S, RetType, AwaitSuspend, Loc)) | |||
465 | // Note that we don't wrap the expression with ExprWithCleanups here | |||
466 | // because that might interfere with tailcall contract (e.g. inserting | |||
467 | // clean up instructions in-between tailcall and return). Instead | |||
468 | // ExprWithCleanups is wrapped within maybeTailCall() prior to the resume | |||
469 | // call. | |||
470 | Calls.Results[ACT::ACT_Suspend] = TailCallSuspend; | |||
471 | else { | |||
472 | // non-class prvalues always have cv-unqualified types | |||
473 | if (RetType->isReferenceType() || | |||
474 | (!RetType->isBooleanType() && !RetType->isVoidType())) { | |||
475 | S.Diag(AwaitSuspend->getCalleeDecl()->getLocation(), | |||
476 | diag::err_await_suspend_invalid_return_type) | |||
477 | << RetType; | |||
478 | S.Diag(Loc, diag::note_coroutine_promise_call_implicitly_required) | |||
479 | << AwaitSuspend->getDirectCallee(); | |||
480 | Calls.IsInvalid = true; | |||
481 | } else | |||
482 | Calls.Results[ACT::ACT_Suspend] = | |||
483 | S.MaybeCreateExprWithCleanups(AwaitSuspend); | |||
484 | } | |||
485 | } | |||
486 | ||||
487 | BuildSubExpr(ACT::ACT_Resume, "await_resume", None); | |||
488 | ||||
489 | // Make sure the awaiter object gets a chance to be cleaned up. | |||
490 | S.Cleanup.setExprNeedsCleanups(true); | |||
491 | ||||
492 | return Calls; | |||
493 | } | |||
494 | ||||
495 | static ExprResult buildPromiseCall(Sema &S, VarDecl *Promise, | |||
496 | SourceLocation Loc, StringRef Name, | |||
497 | MultiExprArg Args) { | |||
498 | ||||
499 | // Form a reference to the promise. | |||
500 | ExprResult PromiseRef = S.BuildDeclRefExpr( | |||
501 | Promise, Promise->getType().getNonReferenceType(), VK_LValue, Loc); | |||
502 | if (PromiseRef.isInvalid()) | |||
503 | return ExprError(); | |||
504 | ||||
505 | return buildMemberCall(S, PromiseRef.get(), Loc, Name, Args); | |||
506 | } | |||
507 | ||||
508 | VarDecl *Sema::buildCoroutinePromise(SourceLocation Loc) { | |||
509 | assert(isa<FunctionDecl>(CurContext) && "not in a function scope")(static_cast <bool> (isa<FunctionDecl>(CurContext ) && "not in a function scope") ? void (0) : __assert_fail ("isa<FunctionDecl>(CurContext) && \"not in a function scope\"" , "/build/llvm-toolchain-snapshot-14~++20210828111110+16086d47c0d0/clang/lib/Sema/SemaCoroutine.cpp" , 509, __extension__ __PRETTY_FUNCTION__)); | |||
510 | auto *FD = cast<FunctionDecl>(CurContext); | |||
511 | bool IsThisDependentType = [&] { | |||
512 | if (auto *MD = dyn_cast_or_null<CXXMethodDecl>(FD)) | |||
513 | return MD->isInstance() && MD->getThisType()->isDependentType(); | |||
514 | else | |||
515 | return false; | |||
516 | }(); | |||
517 | ||||
518 | QualType T = FD->getType()->isDependentType() || IsThisDependentType | |||
519 | ? Context.DependentTy | |||
520 | : lookupPromiseType(*this, FD, Loc); | |||
521 | if (T.isNull()) | |||
522 | return nullptr; | |||
523 | ||||
524 | auto *VD = VarDecl::Create(Context, FD, FD->getLocation(), FD->getLocation(), | |||
525 | &PP.getIdentifierTable().get("__promise"), T, | |||
526 | Context.getTrivialTypeSourceInfo(T, Loc), SC_None); | |||
527 | VD->setImplicit(); | |||
528 | CheckVariableDeclarationType(VD); | |||
529 | if (VD->isInvalidDecl()) | |||
530 | return nullptr; | |||
531 | ||||
532 | auto *ScopeInfo = getCurFunction(); | |||
533 | ||||
534 | // Build a list of arguments, based on the coroutine function's arguments, | |||
535 | // that if present will be passed to the promise type's constructor. | |||
536 | llvm::SmallVector<Expr *, 4> CtorArgExprs; | |||
537 | ||||
538 | // Add implicit object parameter. | |||
539 | if (auto *MD = dyn_cast<CXXMethodDecl>(FD)) { | |||
540 | if (MD->isInstance() && !isLambdaCallOperator(MD)) { | |||
541 | ExprResult ThisExpr = ActOnCXXThis(Loc); | |||
542 | if (ThisExpr.isInvalid()) | |||
543 | return nullptr; | |||
544 | ThisExpr = CreateBuiltinUnaryOp(Loc, UO_Deref, ThisExpr.get()); | |||
545 | if (ThisExpr.isInvalid()) | |||
546 | return nullptr; | |||
547 | CtorArgExprs.push_back(ThisExpr.get()); | |||
548 | } | |||
549 | } | |||
550 | ||||
551 | // Add the coroutine function's parameters. | |||
552 | auto &Moves = ScopeInfo->CoroutineParameterMoves; | |||
553 | for (auto *PD : FD->parameters()) { | |||
554 | if (PD->getType()->isDependentType()) | |||
555 | continue; | |||
556 | ||||
557 | auto RefExpr = ExprEmpty(); | |||
558 | auto Move = Moves.find(PD); | |||
559 | assert(Move != Moves.end() &&(static_cast <bool> (Move != Moves.end() && "Coroutine function parameter not inserted into move map" ) ? void (0) : __assert_fail ("Move != Moves.end() && \"Coroutine function parameter not inserted into move map\"" , "/build/llvm-toolchain-snapshot-14~++20210828111110+16086d47c0d0/clang/lib/Sema/SemaCoroutine.cpp" , 560, __extension__ __PRETTY_FUNCTION__)) | |||
560 | "Coroutine function parameter not inserted into move map")(static_cast <bool> (Move != Moves.end() && "Coroutine function parameter not inserted into move map" ) ? void (0) : __assert_fail ("Move != Moves.end() && \"Coroutine function parameter not inserted into move map\"" , "/build/llvm-toolchain-snapshot-14~++20210828111110+16086d47c0d0/clang/lib/Sema/SemaCoroutine.cpp" , 560, __extension__ __PRETTY_FUNCTION__)); | |||
561 | // If a reference to the function parameter exists in the coroutine | |||
562 | // frame, use that reference. | |||
563 | auto *MoveDecl = | |||
564 | cast<VarDecl>(cast<DeclStmt>(Move->second)->getSingleDecl()); | |||
565 | RefExpr = | |||
566 | BuildDeclRefExpr(MoveDecl, MoveDecl->getType().getNonReferenceType(), | |||
567 | ExprValueKind::VK_LValue, FD->getLocation()); | |||
568 | if (RefExpr.isInvalid()) | |||
569 | return nullptr; | |||
570 | CtorArgExprs.push_back(RefExpr.get()); | |||
571 | } | |||
572 | ||||
573 | // If we have a non-zero number of constructor arguments, try to use them. | |||
574 | // Otherwise, fall back to the promise type's default constructor. | |||
575 | if (!CtorArgExprs.empty()) { | |||
576 | // Create an initialization sequence for the promise type using the | |||
577 | // constructor arguments, wrapped in a parenthesized list expression. | |||
578 | Expr *PLE = ParenListExpr::Create(Context, FD->getLocation(), | |||
579 | CtorArgExprs, FD->getLocation()); | |||
580 | InitializedEntity Entity = InitializedEntity::InitializeVariable(VD); | |||
581 | InitializationKind Kind = InitializationKind::CreateForInit( | |||
582 | VD->getLocation(), /*DirectInit=*/true, PLE); | |||
583 | InitializationSequence InitSeq(*this, Entity, Kind, CtorArgExprs, | |||
584 | /*TopLevelOfInitList=*/false, | |||
585 | /*TreatUnavailableAsInvalid=*/false); | |||
586 | ||||
587 | // Attempt to initialize the promise type with the arguments. | |||
588 | // If that fails, fall back to the promise type's default constructor. | |||
589 | if (InitSeq) { | |||
590 | ExprResult Result = InitSeq.Perform(*this, Entity, Kind, CtorArgExprs); | |||
591 | if (Result.isInvalid()) { | |||
592 | VD->setInvalidDecl(); | |||
593 | } else if (Result.get()) { | |||
594 | VD->setInit(MaybeCreateExprWithCleanups(Result.get())); | |||
595 | VD->setInitStyle(VarDecl::CallInit); | |||
596 | CheckCompleteVariableDeclaration(VD); | |||
597 | } | |||
598 | } else | |||
599 | ActOnUninitializedDecl(VD); | |||
600 | } else | |||
601 | ActOnUninitializedDecl(VD); | |||
602 | ||||
603 | FD->addDecl(VD); | |||
604 | return VD; | |||
605 | } | |||
606 | ||||
607 | /// Check that this is a context in which a coroutine suspension can appear. | |||
608 | static FunctionScopeInfo *checkCoroutineContext(Sema &S, SourceLocation Loc, | |||
609 | StringRef Keyword, | |||
610 | bool IsImplicit = false) { | |||
611 | if (!isValidCoroutineContext(S, Loc, Keyword)) | |||
612 | return nullptr; | |||
613 | ||||
614 | assert(isa<FunctionDecl>(S.CurContext) && "not in a function scope")(static_cast <bool> (isa<FunctionDecl>(S.CurContext ) && "not in a function scope") ? void (0) : __assert_fail ("isa<FunctionDecl>(S.CurContext) && \"not in a function scope\"" , "/build/llvm-toolchain-snapshot-14~++20210828111110+16086d47c0d0/clang/lib/Sema/SemaCoroutine.cpp" , 614, __extension__ __PRETTY_FUNCTION__)); | |||
615 | ||||
616 | auto *ScopeInfo = S.getCurFunction(); | |||
617 | assert(ScopeInfo && "missing function scope for function")(static_cast <bool> (ScopeInfo && "missing function scope for function" ) ? void (0) : __assert_fail ("ScopeInfo && \"missing function scope for function\"" , "/build/llvm-toolchain-snapshot-14~++20210828111110+16086d47c0d0/clang/lib/Sema/SemaCoroutine.cpp" , 617, __extension__ __PRETTY_FUNCTION__)); | |||
618 | ||||
619 | if (ScopeInfo->FirstCoroutineStmtLoc.isInvalid() && !IsImplicit) | |||
620 | ScopeInfo->setFirstCoroutineStmt(Loc, Keyword); | |||
621 | ||||
622 | if (ScopeInfo->CoroutinePromise) | |||
623 | return ScopeInfo; | |||
624 | ||||
625 | if (!S.buildCoroutineParameterMoves(Loc)) | |||
626 | return nullptr; | |||
627 | ||||
628 | ScopeInfo->CoroutinePromise = S.buildCoroutinePromise(Loc); | |||
629 | if (!ScopeInfo->CoroutinePromise) | |||
630 | return nullptr; | |||
631 | ||||
632 | return ScopeInfo; | |||
633 | } | |||
634 | ||||
635 | /// Recursively check \p E and all its children to see if any call target | |||
636 | /// (including constructor call) is declared noexcept. Also any value returned | |||
637 | /// from the call has a noexcept destructor. | |||
638 | static void checkNoThrow(Sema &S, const Stmt *E, | |||
639 | llvm::SmallPtrSetImpl<const Decl *> &ThrowingDecls) { | |||
640 | auto checkDeclNoexcept = [&](const Decl *D, bool IsDtor = false) { | |||
641 | // In the case of dtor, the call to dtor is implicit and hence we should | |||
642 | // pass nullptr to canCalleeThrow. | |||
643 | if (Sema::canCalleeThrow(S, IsDtor ? nullptr : cast<Expr>(E), D)) { | |||
644 | if (const auto *FD = dyn_cast<FunctionDecl>(D)) { | |||
645 | // co_await promise.final_suspend() could end up calling | |||
646 | // __builtin_coro_resume for symmetric transfer if await_suspend() | |||
647 | // returns a handle. In that case, even __builtin_coro_resume is not | |||
648 | // declared as noexcept and may throw, it does not throw _into_ the | |||
649 | // coroutine that just suspended, but rather throws back out from | |||
650 | // whoever called coroutine_handle::resume(), hence we claim that | |||
651 | // logically it does not throw. | |||
652 | if (FD->getBuiltinID() == Builtin::BI__builtin_coro_resume) | |||
653 | return; | |||
654 | } | |||
655 | if (ThrowingDecls.empty()) { | |||
656 | // First time seeing an error, emit the error message. | |||
657 | S.Diag(cast<FunctionDecl>(S.CurContext)->getLocation(), | |||
658 | diag::err_coroutine_promise_final_suspend_requires_nothrow); | |||
659 | } | |||
660 | ThrowingDecls.insert(D); | |||
661 | } | |||
662 | }; | |||
663 | auto SC = E->getStmtClass(); | |||
664 | if (SC == Expr::CXXConstructExprClass) { | |||
665 | auto const *Ctor = cast<CXXConstructExpr>(E)->getConstructor(); | |||
666 | checkDeclNoexcept(Ctor); | |||
667 | // Check the corresponding destructor of the constructor. | |||
668 | checkDeclNoexcept(Ctor->getParent()->getDestructor(), true); | |||
669 | } else if (SC == Expr::CallExprClass || SC == Expr::CXXMemberCallExprClass || | |||
670 | SC == Expr::CXXOperatorCallExprClass) { | |||
671 | if (!cast<CallExpr>(E)->isTypeDependent()) { | |||
672 | checkDeclNoexcept(cast<CallExpr>(E)->getCalleeDecl()); | |||
673 | auto ReturnType = cast<CallExpr>(E)->getCallReturnType(S.getASTContext()); | |||
674 | // Check the destructor of the call return type, if any. | |||
675 | if (ReturnType.isDestructedType() == | |||
676 | QualType::DestructionKind::DK_cxx_destructor) { | |||
677 | const auto *T = | |||
678 | cast<RecordType>(ReturnType.getCanonicalType().getTypePtr()); | |||
679 | checkDeclNoexcept( | |||
680 | dyn_cast<CXXRecordDecl>(T->getDecl())->getDestructor(), true); | |||
| ||||
681 | } | |||
682 | } | |||
683 | } | |||
684 | for (const auto *Child : E->children()) { | |||
685 | if (!Child) | |||
686 | continue; | |||
687 | checkNoThrow(S, Child, ThrowingDecls); | |||
688 | } | |||
689 | } | |||
690 | ||||
691 | bool Sema::checkFinalSuspendNoThrow(const Stmt *FinalSuspend) { | |||
692 | llvm::SmallPtrSet<const Decl *, 4> ThrowingDecls; | |||
693 | // We first collect all declarations that should not throw but not declared | |||
694 | // with noexcept. We then sort them based on the location before printing. | |||
695 | // This is to avoid emitting the same note multiple times on the same | |||
696 | // declaration, and also provide a deterministic order for the messages. | |||
697 | checkNoThrow(*this, FinalSuspend, ThrowingDecls); | |||
698 | auto SortedDecls = llvm::SmallVector<const Decl *, 4>{ThrowingDecls.begin(), | |||
699 | ThrowingDecls.end()}; | |||
700 | sort(SortedDecls, [](const Decl *A, const Decl *B) { | |||
701 | return A->getEndLoc() < B->getEndLoc(); | |||
702 | }); | |||
703 | for (const auto *D : SortedDecls) { | |||
704 | Diag(D->getEndLoc(), diag::note_coroutine_function_declare_noexcept); | |||
705 | } | |||
706 | return ThrowingDecls.empty(); | |||
707 | } | |||
708 | ||||
709 | bool Sema::ActOnCoroutineBodyStart(Scope *SC, SourceLocation KWLoc, | |||
710 | StringRef Keyword) { | |||
711 | if (!checkCoroutineContext(*this, KWLoc, Keyword)) | |||
712 | return false; | |||
713 | auto *ScopeInfo = getCurFunction(); | |||
714 | assert(ScopeInfo->CoroutinePromise)(static_cast <bool> (ScopeInfo->CoroutinePromise) ? void (0) : __assert_fail ("ScopeInfo->CoroutinePromise", "/build/llvm-toolchain-snapshot-14~++20210828111110+16086d47c0d0/clang/lib/Sema/SemaCoroutine.cpp" , 714, __extension__ __PRETTY_FUNCTION__)); | |||
715 | ||||
716 | // If we have existing coroutine statements then we have already built | |||
717 | // the initial and final suspend points. | |||
718 | if (!ScopeInfo->NeedsCoroutineSuspends) | |||
719 | return true; | |||
720 | ||||
721 | ScopeInfo->setNeedsCoroutineSuspends(false); | |||
722 | ||||
723 | auto *Fn = cast<FunctionDecl>(CurContext); | |||
724 | SourceLocation Loc = Fn->getLocation(); | |||
725 | // Build the initial suspend point | |||
726 | auto buildSuspends = [&](StringRef Name) mutable -> StmtResult { | |||
727 | ExprResult Suspend = | |||
728 | buildPromiseCall(*this, ScopeInfo->CoroutinePromise, Loc, Name, None); | |||
729 | if (Suspend.isInvalid()) | |||
730 | return StmtError(); | |||
731 | Suspend = buildOperatorCoawaitCall(*this, SC, Loc, Suspend.get()); | |||
732 | if (Suspend.isInvalid()) | |||
733 | return StmtError(); | |||
734 | Suspend = BuildResolvedCoawaitExpr(Loc, Suspend.get(), | |||
735 | /*IsImplicit*/ true); | |||
736 | Suspend = ActOnFinishFullExpr(Suspend.get(), /*DiscardedValue*/ false); | |||
737 | if (Suspend.isInvalid()) { | |||
738 | Diag(Loc, diag::note_coroutine_promise_suspend_implicitly_required) | |||
739 | << ((Name == "initial_suspend") ? 0 : 1); | |||
740 | Diag(KWLoc, diag::note_declared_coroutine_here) << Keyword; | |||
741 | return StmtError(); | |||
742 | } | |||
743 | return cast<Stmt>(Suspend.get()); | |||
744 | }; | |||
745 | ||||
746 | StmtResult InitSuspend = buildSuspends("initial_suspend"); | |||
747 | if (InitSuspend.isInvalid()) | |||
748 | return true; | |||
749 | ||||
750 | StmtResult FinalSuspend = buildSuspends("final_suspend"); | |||
751 | if (FinalSuspend.isInvalid() || !checkFinalSuspendNoThrow(FinalSuspend.get())) | |||
752 | return true; | |||
753 | ||||
754 | ScopeInfo->setCoroutineSuspends(InitSuspend.get(), FinalSuspend.get()); | |||
755 | ||||
756 | return true; | |||
757 | } | |||
758 | ||||
759 | // Recursively walks up the scope hierarchy until either a 'catch' or a function | |||
760 | // scope is found, whichever comes first. | |||
761 | static bool isWithinCatchScope(Scope *S) { | |||
762 | // 'co_await' and 'co_yield' keywords are disallowed within catch blocks, but | |||
763 | // lambdas that use 'co_await' are allowed. The loop below ends when a | |||
764 | // function scope is found in order to ensure the following behavior: | |||
765 | // | |||
766 | // void foo() { // <- function scope | |||
767 | // try { // | |||
768 | // co_await x; // <- 'co_await' is OK within a function scope | |||
769 | // } catch { // <- catch scope | |||
770 | // co_await x; // <- 'co_await' is not OK within a catch scope | |||
771 | // []() { // <- function scope | |||
772 | // co_await x; // <- 'co_await' is OK within a function scope | |||
773 | // }(); | |||
774 | // } | |||
775 | // } | |||
776 | while (S && !(S->getFlags() & Scope::FnScope)) { | |||
777 | if (S->getFlags() & Scope::CatchScope) | |||
778 | return true; | |||
779 | S = S->getParent(); | |||
780 | } | |||
781 | return false; | |||
782 | } | |||
783 | ||||
784 | // [expr.await]p2, emphasis added: "An await-expression shall appear only in | |||
785 | // a *potentially evaluated* expression within the compound-statement of a | |||
786 | // function-body *outside of a handler* [...] A context within a function | |||
787 | // where an await-expression can appear is called a suspension context of the | |||
788 | // function." | |||
789 | static void checkSuspensionContext(Sema &S, SourceLocation Loc, | |||
790 | StringRef Keyword) { | |||
791 | // First emphasis of [expr.await]p2: must be a potentially evaluated context. | |||
792 | // That is, 'co_await' and 'co_yield' cannot appear in subexpressions of | |||
793 | // \c sizeof. | |||
794 | if (S.isUnevaluatedContext()) | |||
795 | S.Diag(Loc, diag::err_coroutine_unevaluated_context) << Keyword; | |||
796 | ||||
797 | // Second emphasis of [expr.await]p2: must be outside of an exception handler. | |||
798 | if (isWithinCatchScope(S.getCurScope())) | |||
799 | S.Diag(Loc, diag::err_coroutine_within_handler) << Keyword; | |||
800 | } | |||
801 | ||||
802 | ExprResult Sema::ActOnCoawaitExpr(Scope *S, SourceLocation Loc, Expr *E) { | |||
803 | if (!ActOnCoroutineBodyStart(S, Loc, "co_await")) { | |||
804 | CorrectDelayedTyposInExpr(E); | |||
805 | return ExprError(); | |||
806 | } | |||
807 | ||||
808 | checkSuspensionContext(*this, Loc, "co_await"); | |||
809 | ||||
810 | if (E->getType()->isPlaceholderType()) { | |||
811 | ExprResult R = CheckPlaceholderExpr(E); | |||
812 | if (R.isInvalid()) return ExprError(); | |||
813 | E = R.get(); | |||
814 | } | |||
815 | ExprResult Lookup = buildOperatorCoawaitLookupExpr(*this, S, Loc); | |||
816 | if (Lookup.isInvalid()) | |||
817 | return ExprError(); | |||
818 | return BuildUnresolvedCoawaitExpr(Loc, E, | |||
819 | cast<UnresolvedLookupExpr>(Lookup.get())); | |||
820 | } | |||
821 | ||||
822 | ExprResult Sema::BuildUnresolvedCoawaitExpr(SourceLocation Loc, Expr *E, | |||
823 | UnresolvedLookupExpr *Lookup) { | |||
824 | auto *FSI = checkCoroutineContext(*this, Loc, "co_await"); | |||
825 | if (!FSI) | |||
826 | return ExprError(); | |||
827 | ||||
828 | if (E->getType()->isPlaceholderType()) { | |||
829 | ExprResult R = CheckPlaceholderExpr(E); | |||
830 | if (R.isInvalid()) | |||
831 | return ExprError(); | |||
832 | E = R.get(); | |||
833 | } | |||
834 | ||||
835 | auto *Promise = FSI->CoroutinePromise; | |||
836 | if (Promise->getType()->isDependentType()) { | |||
837 | Expr *Res = | |||
838 | new (Context) DependentCoawaitExpr(Loc, Context.DependentTy, E, Lookup); | |||
839 | return Res; | |||
840 | } | |||
841 | ||||
842 | auto *RD = Promise->getType()->getAsCXXRecordDecl(); | |||
843 | if (lookupMember(*this, "await_transform", RD, Loc)) { | |||
844 | ExprResult R = buildPromiseCall(*this, Promise, Loc, "await_transform", E); | |||
845 | if (R.isInvalid()) { | |||
846 | Diag(Loc, | |||
847 | diag::note_coroutine_promise_implicit_await_transform_required_here) | |||
848 | << E->getSourceRange(); | |||
849 | return ExprError(); | |||
850 | } | |||
851 | E = R.get(); | |||
852 | } | |||
853 | ExprResult Awaitable = buildOperatorCoawaitCall(*this, Loc, E, Lookup); | |||
854 | if (Awaitable.isInvalid()) | |||
855 | return ExprError(); | |||
856 | ||||
857 | return BuildResolvedCoawaitExpr(Loc, Awaitable.get()); | |||
858 | } | |||
859 | ||||
860 | ExprResult Sema::BuildResolvedCoawaitExpr(SourceLocation Loc, Expr *E, | |||
861 | bool IsImplicit) { | |||
862 | auto *Coroutine = checkCoroutineContext(*this, Loc, "co_await", IsImplicit); | |||
863 | if (!Coroutine) | |||
864 | return ExprError(); | |||
865 | ||||
866 | if (E->getType()->isPlaceholderType()) { | |||
867 | ExprResult R = CheckPlaceholderExpr(E); | |||
868 | if (R.isInvalid()) return ExprError(); | |||
869 | E = R.get(); | |||
870 | } | |||
871 | ||||
872 | if (E->getType()->isDependentType()) { | |||
873 | Expr *Res = new (Context) | |||
874 | CoawaitExpr(Loc, Context.DependentTy, E, IsImplicit); | |||
875 | return Res; | |||
876 | } | |||
877 | ||||
878 | // If the expression is a temporary, materialize it as an lvalue so that we | |||
879 | // can use it multiple times. | |||
880 | if (E->isPRValue()) | |||
881 | E = CreateMaterializeTemporaryExpr(E->getType(), E, true); | |||
882 | ||||
883 | // The location of the `co_await` token cannot be used when constructing | |||
884 | // the member call expressions since it's before the location of `Expr`, which | |||
885 | // is used as the start of the member call expression. | |||
886 | SourceLocation CallLoc = E->getExprLoc(); | |||
887 | ||||
888 | // Build the await_ready, await_suspend, await_resume calls. | |||
889 | ReadySuspendResumeResult RSS = buildCoawaitCalls( | |||
890 | *this, Coroutine->CoroutinePromise, CallLoc, E); | |||
891 | if (RSS.IsInvalid) | |||
892 | return ExprError(); | |||
893 | ||||
894 | Expr *Res = | |||
895 | new (Context) CoawaitExpr(Loc, E, RSS.Results[0], RSS.Results[1], | |||
896 | RSS.Results[2], RSS.OpaqueValue, IsImplicit); | |||
897 | ||||
898 | return Res; | |||
899 | } | |||
900 | ||||
901 | ExprResult Sema::ActOnCoyieldExpr(Scope *S, SourceLocation Loc, Expr *E) { | |||
902 | if (!ActOnCoroutineBodyStart(S, Loc, "co_yield")) { | |||
903 | CorrectDelayedTyposInExpr(E); | |||
904 | return ExprError(); | |||
905 | } | |||
906 | ||||
907 | checkSuspensionContext(*this, Loc, "co_yield"); | |||
908 | ||||
909 | // Build yield_value call. | |||
910 | ExprResult Awaitable = buildPromiseCall( | |||
911 | *this, getCurFunction()->CoroutinePromise, Loc, "yield_value", E); | |||
912 | if (Awaitable.isInvalid()) | |||
913 | return ExprError(); | |||
914 | ||||
915 | // Build 'operator co_await' call. | |||
916 | Awaitable = buildOperatorCoawaitCall(*this, S, Loc, Awaitable.get()); | |||
917 | if (Awaitable.isInvalid()) | |||
918 | return ExprError(); | |||
919 | ||||
920 | return BuildCoyieldExpr(Loc, Awaitable.get()); | |||
921 | } | |||
922 | ExprResult Sema::BuildCoyieldExpr(SourceLocation Loc, Expr *E) { | |||
923 | auto *Coroutine = checkCoroutineContext(*this, Loc, "co_yield"); | |||
924 | if (!Coroutine) | |||
925 | return ExprError(); | |||
926 | ||||
927 | if (E->getType()->isPlaceholderType()) { | |||
928 | ExprResult R = CheckPlaceholderExpr(E); | |||
929 | if (R.isInvalid()) return ExprError(); | |||
930 | E = R.get(); | |||
931 | } | |||
932 | ||||
933 | if (E->getType()->isDependentType()) { | |||
934 | Expr *Res = new (Context) CoyieldExpr(Loc, Context.DependentTy, E); | |||
935 | return Res; | |||
936 | } | |||
937 | ||||
938 | // If the expression is a temporary, materialize it as an lvalue so that we | |||
939 | // can use it multiple times. | |||
940 | if (E->isPRValue()) | |||
941 | E = CreateMaterializeTemporaryExpr(E->getType(), E, true); | |||
942 | ||||
943 | // Build the await_ready, await_suspend, await_resume calls. | |||
944 | ReadySuspendResumeResult RSS = buildCoawaitCalls( | |||
945 | *this, Coroutine->CoroutinePromise, Loc, E); | |||
946 | if (RSS.IsInvalid) | |||
947 | return ExprError(); | |||
948 | ||||
949 | Expr *Res = | |||
950 | new (Context) CoyieldExpr(Loc, E, RSS.Results[0], RSS.Results[1], | |||
951 | RSS.Results[2], RSS.OpaqueValue); | |||
952 | ||||
953 | return Res; | |||
954 | } | |||
955 | ||||
956 | StmtResult Sema::ActOnCoreturnStmt(Scope *S, SourceLocation Loc, Expr *E) { | |||
957 | if (!ActOnCoroutineBodyStart(S, Loc, "co_return")) { | |||
| ||||
958 | CorrectDelayedTyposInExpr(E); | |||
959 | return StmtError(); | |||
960 | } | |||
961 | return BuildCoreturnStmt(Loc, E); | |||
962 | } | |||
963 | ||||
964 | StmtResult Sema::BuildCoreturnStmt(SourceLocation Loc, Expr *E, | |||
965 | bool IsImplicit) { | |||
966 | auto *FSI = checkCoroutineContext(*this, Loc, "co_return", IsImplicit); | |||
967 | if (!FSI) | |||
968 | return StmtError(); | |||
969 | ||||
970 | if (E && E->getType()->isPlaceholderType() && | |||
971 | !E->getType()->isSpecificPlaceholderType(BuiltinType::Overload)) { | |||
972 | ExprResult R = CheckPlaceholderExpr(E); | |||
973 | if (R.isInvalid()) return StmtError(); | |||
974 | E = R.get(); | |||
975 | } | |||
976 | ||||
977 | VarDecl *Promise = FSI->CoroutinePromise; | |||
978 | ExprResult PC; | |||
979 | if (E && (isa<InitListExpr>(E) || !E->getType()->isVoidType())) { | |||
980 | getNamedReturnInfo(E, SimplerImplicitMoveMode::ForceOn); | |||
981 | PC = buildPromiseCall(*this, Promise, Loc, "return_value", E); | |||
982 | } else { | |||
983 | E = MakeFullDiscardedValueExpr(E).get(); | |||
984 | PC = buildPromiseCall(*this, Promise, Loc, "return_void", None); | |||
985 | } | |||
986 | if (PC.isInvalid()) | |||
987 | return StmtError(); | |||
988 | ||||
989 | Expr *PCE = ActOnFinishFullExpr(PC.get(), /*DiscardedValue*/ false).get(); | |||
990 | ||||
991 | Stmt *Res = new (Context) CoreturnStmt(Loc, E, PCE, IsImplicit); | |||
992 | return Res; | |||
993 | } | |||
994 | ||||
995 | /// Look up the std::nothrow object. | |||
996 | static Expr *buildStdNoThrowDeclRef(Sema &S, SourceLocation Loc) { | |||
997 | NamespaceDecl *Std = S.getStdNamespace(); | |||
998 | assert(Std && "Should already be diagnosed")(static_cast <bool> (Std && "Should already be diagnosed" ) ? void (0) : __assert_fail ("Std && \"Should already be diagnosed\"" , "/build/llvm-toolchain-snapshot-14~++20210828111110+16086d47c0d0/clang/lib/Sema/SemaCoroutine.cpp" , 998, __extension__ __PRETTY_FUNCTION__)); | |||
999 | ||||
1000 | LookupResult Result(S, &S.PP.getIdentifierTable().get("nothrow"), Loc, | |||
1001 | Sema::LookupOrdinaryName); | |||
1002 | if (!S.LookupQualifiedName(Result, Std)) { | |||
1003 | // FIXME: <experimental/coroutine> should have been included already. | |||
1004 | // If we require it to include <new> then this diagnostic is no longer | |||
1005 | // needed. | |||
1006 | S.Diag(Loc, diag::err_implicit_coroutine_std_nothrow_type_not_found); | |||
1007 | return nullptr; | |||
1008 | } | |||
1009 | ||||
1010 | auto *VD = Result.getAsSingle<VarDecl>(); | |||
1011 | if (!VD) { | |||
1012 | Result.suppressDiagnostics(); | |||
1013 | // We found something weird. Complain about the first thing we found. | |||
1014 | NamedDecl *Found = *Result.begin(); | |||
1015 | S.Diag(Found->getLocation(), diag::err_malformed_std_nothrow); | |||
1016 | return nullptr; | |||
1017 | } | |||
1018 | ||||
1019 | ExprResult DR = S.BuildDeclRefExpr(VD, VD->getType(), VK_LValue, Loc); | |||
1020 | if (DR.isInvalid()) | |||
1021 | return nullptr; | |||
1022 | ||||
1023 | return DR.get(); | |||
1024 | } | |||
1025 | ||||
1026 | // Find an appropriate delete for the promise. | |||
1027 | static FunctionDecl *findDeleteForPromise(Sema &S, SourceLocation Loc, | |||
1028 | QualType PromiseType) { | |||
1029 | FunctionDecl *OperatorDelete = nullptr; | |||
1030 | ||||
1031 | DeclarationName DeleteName = | |||
1032 | S.Context.DeclarationNames.getCXXOperatorName(OO_Delete); | |||
1033 | ||||
1034 | auto *PointeeRD = PromiseType->getAsCXXRecordDecl(); | |||
1035 | assert(PointeeRD && "PromiseType must be a CxxRecordDecl type")(static_cast <bool> (PointeeRD && "PromiseType must be a CxxRecordDecl type" ) ? void (0) : __assert_fail ("PointeeRD && \"PromiseType must be a CxxRecordDecl type\"" , "/build/llvm-toolchain-snapshot-14~++20210828111110+16086d47c0d0/clang/lib/Sema/SemaCoroutine.cpp" , 1035, __extension__ __PRETTY_FUNCTION__)); | |||
1036 | ||||
1037 | if (S.FindDeallocationFunction(Loc, PointeeRD, DeleteName, OperatorDelete)) | |||
1038 | return nullptr; | |||
1039 | ||||
1040 | if (!OperatorDelete) { | |||
1041 | // Look for a global declaration. | |||
1042 | const bool CanProvideSize = S.isCompleteType(Loc, PromiseType); | |||
1043 | const bool Overaligned = false; | |||
1044 | OperatorDelete = S.FindUsualDeallocationFunction(Loc, CanProvideSize, | |||
1045 | Overaligned, DeleteName); | |||
1046 | } | |||
1047 | S.MarkFunctionReferenced(Loc, OperatorDelete); | |||
1048 | return OperatorDelete; | |||
1049 | } | |||
1050 | ||||
1051 | ||||
1052 | void Sema::CheckCompletedCoroutineBody(FunctionDecl *FD, Stmt *&Body) { | |||
1053 | FunctionScopeInfo *Fn = getCurFunction(); | |||
1054 | assert(Fn && Fn->isCoroutine() && "not a coroutine")(static_cast <bool> (Fn && Fn->isCoroutine() && "not a coroutine") ? void (0) : __assert_fail ("Fn && Fn->isCoroutine() && \"not a coroutine\"" , "/build/llvm-toolchain-snapshot-14~++20210828111110+16086d47c0d0/clang/lib/Sema/SemaCoroutine.cpp" , 1054, __extension__ __PRETTY_FUNCTION__)); | |||
1055 | if (!Body) { | |||
1056 | assert(FD->isInvalidDecl() &&(static_cast <bool> (FD->isInvalidDecl() && "a null body is only allowed for invalid declarations" ) ? void (0) : __assert_fail ("FD->isInvalidDecl() && \"a null body is only allowed for invalid declarations\"" , "/build/llvm-toolchain-snapshot-14~++20210828111110+16086d47c0d0/clang/lib/Sema/SemaCoroutine.cpp" , 1057, __extension__ __PRETTY_FUNCTION__)) | |||
1057 | "a null body is only allowed for invalid declarations")(static_cast <bool> (FD->isInvalidDecl() && "a null body is only allowed for invalid declarations" ) ? void (0) : __assert_fail ("FD->isInvalidDecl() && \"a null body is only allowed for invalid declarations\"" , "/build/llvm-toolchain-snapshot-14~++20210828111110+16086d47c0d0/clang/lib/Sema/SemaCoroutine.cpp" , 1057, __extension__ __PRETTY_FUNCTION__)); | |||
1058 | return; | |||
1059 | } | |||
1060 | // We have a function that uses coroutine keywords, but we failed to build | |||
1061 | // the promise type. | |||
1062 | if (!Fn->CoroutinePromise) | |||
1063 | return FD->setInvalidDecl(); | |||
1064 | ||||
1065 | if (isa<CoroutineBodyStmt>(Body)) { | |||
1066 | // Nothing todo. the body is already a transformed coroutine body statement. | |||
1067 | return; | |||
1068 | } | |||
1069 | ||||
1070 | // Coroutines [stmt.return]p1: | |||
1071 | // A return statement shall not appear in a coroutine. | |||
1072 | if (Fn->FirstReturnLoc.isValid()) { | |||
1073 | assert(Fn->FirstCoroutineStmtLoc.isValid() &&(static_cast <bool> (Fn->FirstCoroutineStmtLoc.isValid () && "first coroutine location not set") ? void (0) : __assert_fail ("Fn->FirstCoroutineStmtLoc.isValid() && \"first coroutine location not set\"" , "/build/llvm-toolchain-snapshot-14~++20210828111110+16086d47c0d0/clang/lib/Sema/SemaCoroutine.cpp" , 1074, __extension__ __PRETTY_FUNCTION__)) | |||
1074 | "first coroutine location not set")(static_cast <bool> (Fn->FirstCoroutineStmtLoc.isValid () && "first coroutine location not set") ? void (0) : __assert_fail ("Fn->FirstCoroutineStmtLoc.isValid() && \"first coroutine location not set\"" , "/build/llvm-toolchain-snapshot-14~++20210828111110+16086d47c0d0/clang/lib/Sema/SemaCoroutine.cpp" , 1074, __extension__ __PRETTY_FUNCTION__)); | |||
1075 | Diag(Fn->FirstReturnLoc, diag::err_return_in_coroutine); | |||
1076 | Diag(Fn->FirstCoroutineStmtLoc, diag::note_declared_coroutine_here) | |||
1077 | << Fn->getFirstCoroutineStmtKeyword(); | |||
1078 | } | |||
1079 | CoroutineStmtBuilder Builder(*this, *FD, *Fn, Body); | |||
1080 | if (Builder.isInvalid() || !Builder.buildStatements()) | |||
1081 | return FD->setInvalidDecl(); | |||
1082 | ||||
1083 | // Build body for the coroutine wrapper statement. | |||
1084 | Body = CoroutineBodyStmt::Create(Context, Builder); | |||
1085 | } | |||
1086 | ||||
1087 | CoroutineStmtBuilder::CoroutineStmtBuilder(Sema &S, FunctionDecl &FD, | |||
1088 | sema::FunctionScopeInfo &Fn, | |||
1089 | Stmt *Body) | |||
1090 | : S(S), FD(FD), Fn(Fn), Loc(FD.getLocation()), | |||
1091 | IsPromiseDependentType( | |||
1092 | !Fn.CoroutinePromise || | |||
1093 | Fn.CoroutinePromise->getType()->isDependentType()) { | |||
1094 | this->Body = Body; | |||
1095 | ||||
1096 | for (auto KV : Fn.CoroutineParameterMoves) | |||
1097 | this->ParamMovesVector.push_back(KV.second); | |||
1098 | this->ParamMoves = this->ParamMovesVector; | |||
1099 | ||||
1100 | if (!IsPromiseDependentType) { | |||
1101 | PromiseRecordDecl = Fn.CoroutinePromise->getType()->getAsCXXRecordDecl(); | |||
1102 | assert(PromiseRecordDecl && "Type should have already been checked")(static_cast <bool> (PromiseRecordDecl && "Type should have already been checked" ) ? void (0) : __assert_fail ("PromiseRecordDecl && \"Type should have already been checked\"" , "/build/llvm-toolchain-snapshot-14~++20210828111110+16086d47c0d0/clang/lib/Sema/SemaCoroutine.cpp" , 1102, __extension__ __PRETTY_FUNCTION__)); | |||
1103 | } | |||
1104 | this->IsValid = makePromiseStmt() && makeInitialAndFinalSuspend(); | |||
1105 | } | |||
1106 | ||||
1107 | bool CoroutineStmtBuilder::buildStatements() { | |||
1108 | assert(this->IsValid && "coroutine already invalid")(static_cast <bool> (this->IsValid && "coroutine already invalid" ) ? void (0) : __assert_fail ("this->IsValid && \"coroutine already invalid\"" , "/build/llvm-toolchain-snapshot-14~++20210828111110+16086d47c0d0/clang/lib/Sema/SemaCoroutine.cpp" , 1108, __extension__ __PRETTY_FUNCTION__)); | |||
1109 | this->IsValid = makeReturnObject(); | |||
1110 | if (this->IsValid && !IsPromiseDependentType) | |||
1111 | buildDependentStatements(); | |||
1112 | return this->IsValid; | |||
1113 | } | |||
1114 | ||||
1115 | bool CoroutineStmtBuilder::buildDependentStatements() { | |||
1116 | assert(this->IsValid && "coroutine already invalid")(static_cast <bool> (this->IsValid && "coroutine already invalid" ) ? void (0) : __assert_fail ("this->IsValid && \"coroutine already invalid\"" , "/build/llvm-toolchain-snapshot-14~++20210828111110+16086d47c0d0/clang/lib/Sema/SemaCoroutine.cpp" , 1116, __extension__ __PRETTY_FUNCTION__)); | |||
1117 | assert(!this->IsPromiseDependentType &&(static_cast <bool> (!this->IsPromiseDependentType && "coroutine cannot have a dependent promise type") ? void (0) : __assert_fail ("!this->IsPromiseDependentType && \"coroutine cannot have a dependent promise type\"" , "/build/llvm-toolchain-snapshot-14~++20210828111110+16086d47c0d0/clang/lib/Sema/SemaCoroutine.cpp" , 1118, __extension__ __PRETTY_FUNCTION__)) | |||
1118 | "coroutine cannot have a dependent promise type")(static_cast <bool> (!this->IsPromiseDependentType && "coroutine cannot have a dependent promise type") ? void (0) : __assert_fail ("!this->IsPromiseDependentType && \"coroutine cannot have a dependent promise type\"" , "/build/llvm-toolchain-snapshot-14~++20210828111110+16086d47c0d0/clang/lib/Sema/SemaCoroutine.cpp" , 1118, __extension__ __PRETTY_FUNCTION__)); | |||
1119 | this->IsValid = makeOnException() && makeOnFallthrough() && | |||
1120 | makeGroDeclAndReturnStmt() && makeReturnOnAllocFailure() && | |||
1121 | makeNewAndDeleteExpr(); | |||
1122 | return this->IsValid; | |||
1123 | } | |||
1124 | ||||
1125 | bool CoroutineStmtBuilder::makePromiseStmt() { | |||
1126 | // Form a declaration statement for the promise declaration, so that AST | |||
1127 | // visitors can more easily find it. | |||
1128 | StmtResult PromiseStmt = | |||
1129 | S.ActOnDeclStmt(S.ConvertDeclToDeclGroup(Fn.CoroutinePromise), Loc, Loc); | |||
1130 | if (PromiseStmt.isInvalid()) | |||
1131 | return false; | |||
1132 | ||||
1133 | this->Promise = PromiseStmt.get(); | |||
1134 | return true; | |||
1135 | } | |||
1136 | ||||
1137 | bool CoroutineStmtBuilder::makeInitialAndFinalSuspend() { | |||
1138 | if (Fn.hasInvalidCoroutineSuspends()) | |||
1139 | return false; | |||
1140 | this->InitialSuspend = cast<Expr>(Fn.CoroutineSuspends.first); | |||
1141 | this->FinalSuspend = cast<Expr>(Fn.CoroutineSuspends.second); | |||
1142 | return true; | |||
1143 | } | |||
1144 | ||||
1145 | static bool diagReturnOnAllocFailure(Sema &S, Expr *E, | |||
1146 | CXXRecordDecl *PromiseRecordDecl, | |||
1147 | FunctionScopeInfo &Fn) { | |||
1148 | auto Loc = E->getExprLoc(); | |||
1149 | if (auto *DeclRef = dyn_cast_or_null<DeclRefExpr>(E)) { | |||
1150 | auto *Decl = DeclRef->getDecl(); | |||
1151 | if (CXXMethodDecl *Method = dyn_cast_or_null<CXXMethodDecl>(Decl)) { | |||
1152 | if (Method->isStatic()) | |||
1153 | return true; | |||
1154 | else | |||
1155 | Loc = Decl->getLocation(); | |||
1156 | } | |||
1157 | } | |||
1158 | ||||
1159 | S.Diag( | |||
1160 | Loc, | |||
1161 | diag::err_coroutine_promise_get_return_object_on_allocation_failure) | |||
1162 | << PromiseRecordDecl; | |||
1163 | S.Diag(Fn.FirstCoroutineStmtLoc, diag::note_declared_coroutine_here) | |||
1164 | << Fn.getFirstCoroutineStmtKeyword(); | |||
1165 | return false; | |||
1166 | } | |||
1167 | ||||
1168 | bool CoroutineStmtBuilder::makeReturnOnAllocFailure() { | |||
1169 | assert(!IsPromiseDependentType &&(static_cast <bool> (!IsPromiseDependentType && "cannot make statement while the promise type is dependent") ? void (0) : __assert_fail ("!IsPromiseDependentType && \"cannot make statement while the promise type is dependent\"" , "/build/llvm-toolchain-snapshot-14~++20210828111110+16086d47c0d0/clang/lib/Sema/SemaCoroutine.cpp" , 1170, __extension__ __PRETTY_FUNCTION__)) | |||
1170 | "cannot make statement while the promise type is dependent")(static_cast <bool> (!IsPromiseDependentType && "cannot make statement while the promise type is dependent") ? void (0) : __assert_fail ("!IsPromiseDependentType && \"cannot make statement while the promise type is dependent\"" , "/build/llvm-toolchain-snapshot-14~++20210828111110+16086d47c0d0/clang/lib/Sema/SemaCoroutine.cpp" , 1170, __extension__ __PRETTY_FUNCTION__)); | |||
1171 | ||||
1172 | // [dcl.fct.def.coroutine]/8 | |||
1173 | // The unqualified-id get_return_object_on_allocation_failure is looked up in | |||
1174 | // the scope of class P by class member access lookup (3.4.5). ... | |||
1175 | // If an allocation function returns nullptr, ... the coroutine return value | |||
1176 | // is obtained by a call to ... get_return_object_on_allocation_failure(). | |||
1177 | ||||
1178 | DeclarationName DN = | |||
1179 | S.PP.getIdentifierInfo("get_return_object_on_allocation_failure"); | |||
1180 | LookupResult Found(S, DN, Loc, Sema::LookupMemberName); | |||
1181 | if (!S.LookupQualifiedName(Found, PromiseRecordDecl)) | |||
1182 | return true; | |||
1183 | ||||
1184 | CXXScopeSpec SS; | |||
1185 | ExprResult DeclNameExpr = | |||
1186 | S.BuildDeclarationNameExpr(SS, Found, /*NeedsADL=*/false); | |||
1187 | if (DeclNameExpr.isInvalid()) | |||
1188 | return false; | |||
1189 | ||||
1190 | if (!diagReturnOnAllocFailure(S, DeclNameExpr.get(), PromiseRecordDecl, Fn)) | |||
1191 | return false; | |||
1192 | ||||
1193 | ExprResult ReturnObjectOnAllocationFailure = | |||
1194 | S.BuildCallExpr(nullptr, DeclNameExpr.get(), Loc, {}, Loc); | |||
1195 | if (ReturnObjectOnAllocationFailure.isInvalid()) | |||
1196 | return false; | |||
1197 | ||||
1198 | StmtResult ReturnStmt = | |||
1199 | S.BuildReturnStmt(Loc, ReturnObjectOnAllocationFailure.get()); | |||
1200 | if (ReturnStmt.isInvalid()) { | |||
1201 | S.Diag(Found.getFoundDecl()->getLocation(), diag::note_member_declared_here) | |||
1202 | << DN; | |||
1203 | S.Diag(Fn.FirstCoroutineStmtLoc, diag::note_declared_coroutine_here) | |||
1204 | << Fn.getFirstCoroutineStmtKeyword(); | |||
1205 | return false; | |||
1206 | } | |||
1207 | ||||
1208 | this->ReturnStmtOnAllocFailure = ReturnStmt.get(); | |||
1209 | return true; | |||
1210 | } | |||
1211 | ||||
1212 | bool CoroutineStmtBuilder::makeNewAndDeleteExpr() { | |||
1213 | // Form and check allocation and deallocation calls. | |||
1214 | assert(!IsPromiseDependentType &&(static_cast <bool> (!IsPromiseDependentType && "cannot make statement while the promise type is dependent") ? void (0) : __assert_fail ("!IsPromiseDependentType && \"cannot make statement while the promise type is dependent\"" , "/build/llvm-toolchain-snapshot-14~++20210828111110+16086d47c0d0/clang/lib/Sema/SemaCoroutine.cpp" , 1215, __extension__ __PRETTY_FUNCTION__)) | |||
1215 | "cannot make statement while the promise type is dependent")(static_cast <bool> (!IsPromiseDependentType && "cannot make statement while the promise type is dependent") ? void (0) : __assert_fail ("!IsPromiseDependentType && \"cannot make statement while the promise type is dependent\"" , "/build/llvm-toolchain-snapshot-14~++20210828111110+16086d47c0d0/clang/lib/Sema/SemaCoroutine.cpp" , 1215, __extension__ __PRETTY_FUNCTION__)); | |||
1216 | QualType PromiseType = Fn.CoroutinePromise->getType(); | |||
1217 | ||||
1218 | if (S.RequireCompleteType(Loc, PromiseType, diag::err_incomplete_type)) | |||
1219 | return false; | |||
1220 | ||||
1221 | const bool RequiresNoThrowAlloc = ReturnStmtOnAllocFailure != nullptr; | |||
1222 | ||||
1223 | // [dcl.fct.def.coroutine]/7 | |||
1224 | // Lookup allocation functions using a parameter list composed of the | |||
1225 | // requested size of the coroutine state being allocated, followed by | |||
1226 | // the coroutine function's arguments. If a matching allocation function | |||
1227 | // exists, use it. Otherwise, use an allocation function that just takes | |||
1228 | // the requested size. | |||
1229 | ||||
1230 | FunctionDecl *OperatorNew = nullptr; | |||
1231 | FunctionDecl *OperatorDelete = nullptr; | |||
1232 | FunctionDecl *UnusedResult = nullptr; | |||
1233 | bool PassAlignment = false; | |||
1234 | SmallVector<Expr *, 1> PlacementArgs; | |||
1235 | ||||
1236 | // [dcl.fct.def.coroutine]/7 | |||
1237 | // "The allocation function’s name is looked up in the scope of P. | |||
1238 | // [...] If the lookup finds an allocation function in the scope of P, | |||
1239 | // overload resolution is performed on a function call created by assembling | |||
1240 | // an argument list. The first argument is the amount of space requested, | |||
1241 | // and has type std::size_t. The lvalues p1 ... pn are the succeeding | |||
1242 | // arguments." | |||
1243 | // | |||
1244 | // ...where "p1 ... pn" are defined earlier as: | |||
1245 | // | |||
1246 | // [dcl.fct.def.coroutine]/3 | |||
1247 | // "For a coroutine f that is a non-static member function, let P1 denote the | |||
1248 | // type of the implicit object parameter (13.3.1) and P2 ... Pn be the types | |||
1249 | // of the function parameters; otherwise let P1 ... Pn be the types of the | |||
1250 | // function parameters. Let p1 ... pn be lvalues denoting those objects." | |||
1251 | if (auto *MD = dyn_cast<CXXMethodDecl>(&FD)) { | |||
1252 | if (MD->isInstance() && !isLambdaCallOperator(MD)) { | |||
1253 | ExprResult ThisExpr = S.ActOnCXXThis(Loc); | |||
1254 | if (ThisExpr.isInvalid()) | |||
1255 | return false; | |||
1256 | ThisExpr = S.CreateBuiltinUnaryOp(Loc, UO_Deref, ThisExpr.get()); | |||
1257 | if (ThisExpr.isInvalid()) | |||
1258 | return false; | |||
1259 | PlacementArgs.push_back(ThisExpr.get()); | |||
1260 | } | |||
1261 | } | |||
1262 | for (auto *PD : FD.parameters()) { | |||
1263 | if (PD->getType()->isDependentType()) | |||
1264 | continue; | |||
1265 | ||||
1266 | // Build a reference to the parameter. | |||
1267 | auto PDLoc = PD->getLocation(); | |||
1268 | ExprResult PDRefExpr = | |||
1269 | S.BuildDeclRefExpr(PD, PD->getOriginalType().getNonReferenceType(), | |||
1270 | ExprValueKind::VK_LValue, PDLoc); | |||
1271 | if (PDRefExpr.isInvalid()) | |||
1272 | return false; | |||
1273 | ||||
1274 | PlacementArgs.push_back(PDRefExpr.get()); | |||
1275 | } | |||
1276 | S.FindAllocationFunctions(Loc, SourceRange(), /*NewScope*/ Sema::AFS_Class, | |||
1277 | /*DeleteScope*/ Sema::AFS_Both, PromiseType, | |||
1278 | /*isArray*/ false, PassAlignment, PlacementArgs, | |||
1279 | OperatorNew, UnusedResult, /*Diagnose*/ false); | |||
1280 | ||||
1281 | // [dcl.fct.def.coroutine]/7 | |||
1282 | // "If no matching function is found, overload resolution is performed again | |||
1283 | // on a function call created by passing just the amount of space required as | |||
1284 | // an argument of type std::size_t." | |||
1285 | if (!OperatorNew && !PlacementArgs.empty()) { | |||
1286 | PlacementArgs.clear(); | |||
1287 | S.FindAllocationFunctions(Loc, SourceRange(), /*NewScope*/ Sema::AFS_Class, | |||
1288 | /*DeleteScope*/ Sema::AFS_Both, PromiseType, | |||
1289 | /*isArray*/ false, PassAlignment, PlacementArgs, | |||
1290 | OperatorNew, UnusedResult, /*Diagnose*/ false); | |||
1291 | } | |||
1292 | ||||
1293 | // [dcl.fct.def.coroutine]/7 | |||
1294 | // "The allocation function’s name is looked up in the scope of P. If this | |||
1295 | // lookup fails, the allocation function’s name is looked up in the global | |||
1296 | // scope." | |||
1297 | if (!OperatorNew) { | |||
1298 | S.FindAllocationFunctions(Loc, SourceRange(), /*NewScope*/ Sema::AFS_Global, | |||
1299 | /*DeleteScope*/ Sema::AFS_Both, PromiseType, | |||
1300 | /*isArray*/ false, PassAlignment, PlacementArgs, | |||
1301 | OperatorNew, UnusedResult); | |||
1302 | } | |||
1303 | ||||
1304 | bool IsGlobalOverload = | |||
1305 | OperatorNew && !isa<CXXRecordDecl>(OperatorNew->getDeclContext()); | |||
1306 | // If we didn't find a class-local new declaration and non-throwing new | |||
1307 | // was is required then we need to lookup the non-throwing global operator | |||
1308 | // instead. | |||
1309 | if (RequiresNoThrowAlloc && (!OperatorNew || IsGlobalOverload)) { | |||
1310 | auto *StdNoThrow = buildStdNoThrowDeclRef(S, Loc); | |||
1311 | if (!StdNoThrow) | |||
1312 | return false; | |||
1313 | PlacementArgs = {StdNoThrow}; | |||
1314 | OperatorNew = nullptr; | |||
1315 | S.FindAllocationFunctions(Loc, SourceRange(), /*NewScope*/ Sema::AFS_Both, | |||
1316 | /*DeleteScope*/ Sema::AFS_Both, PromiseType, | |||
1317 | /*isArray*/ false, PassAlignment, PlacementArgs, | |||
1318 | OperatorNew, UnusedResult); | |||
1319 | } | |||
1320 | ||||
1321 | if (!OperatorNew) | |||
1322 | return false; | |||
1323 | ||||
1324 | if (RequiresNoThrowAlloc) { | |||
1325 | const auto *FT = OperatorNew->getType()->castAs<FunctionProtoType>(); | |||
1326 | if (!FT->isNothrow(/*ResultIfDependent*/ false)) { | |||
1327 | S.Diag(OperatorNew->getLocation(), | |||
1328 | diag::err_coroutine_promise_new_requires_nothrow) | |||
1329 | << OperatorNew; | |||
1330 | S.Diag(Loc, diag::note_coroutine_promise_call_implicitly_required) | |||
1331 | << OperatorNew; | |||
1332 | return false; | |||
1333 | } | |||
1334 | } | |||
1335 | ||||
1336 | if ((OperatorDelete = findDeleteForPromise(S, Loc, PromiseType)) == nullptr) | |||
1337 | return false; | |||
1338 | ||||
1339 | Expr *FramePtr = | |||
1340 | S.BuildBuiltinCallExpr(Loc, Builtin::BI__builtin_coro_frame, {}); | |||
1341 | ||||
1342 | Expr *FrameSize = | |||
1343 | S.BuildBuiltinCallExpr(Loc, Builtin::BI__builtin_coro_size, {}); | |||
1344 | ||||
1345 | // Make new call. | |||
1346 | ||||
1347 | ExprResult NewRef = | |||
1348 | S.BuildDeclRefExpr(OperatorNew, OperatorNew->getType(), VK_LValue, Loc); | |||
1349 | if (NewRef.isInvalid()) | |||
1350 | return false; | |||
1351 | ||||
1352 | SmallVector<Expr *, 2> NewArgs(1, FrameSize); | |||
1353 | for (auto Arg : PlacementArgs) | |||
1354 | NewArgs.push_back(Arg); | |||
1355 | ||||
1356 | ExprResult NewExpr = | |||
1357 | S.BuildCallExpr(S.getCurScope(), NewRef.get(), Loc, NewArgs, Loc); | |||
1358 | NewExpr = S.ActOnFinishFullExpr(NewExpr.get(), /*DiscardedValue*/ false); | |||
1359 | if (NewExpr.isInvalid()) | |||
1360 | return false; | |||
1361 | ||||
1362 | // Make delete call. | |||
1363 | ||||
1364 | QualType OpDeleteQualType = OperatorDelete->getType(); | |||
1365 | ||||
1366 | ExprResult DeleteRef = | |||
1367 | S.BuildDeclRefExpr(OperatorDelete, OpDeleteQualType, VK_LValue, Loc); | |||
1368 | if (DeleteRef.isInvalid()) | |||
1369 | return false; | |||
1370 | ||||
1371 | Expr *CoroFree = | |||
1372 | S.BuildBuiltinCallExpr(Loc, Builtin::BI__builtin_coro_free, {FramePtr}); | |||
1373 | ||||
1374 | SmallVector<Expr *, 2> DeleteArgs{CoroFree}; | |||
1375 | ||||
1376 | // Check if we need to pass the size. | |||
1377 | const auto *OpDeleteType = | |||
1378 | OpDeleteQualType.getTypePtr()->castAs<FunctionProtoType>(); | |||
1379 | if (OpDeleteType->getNumParams() > 1) | |||
1380 | DeleteArgs.push_back(FrameSize); | |||
1381 | ||||
1382 | ExprResult DeleteExpr = | |||
1383 | S.BuildCallExpr(S.getCurScope(), DeleteRef.get(), Loc, DeleteArgs, Loc); | |||
1384 | DeleteExpr = | |||
1385 | S.ActOnFinishFullExpr(DeleteExpr.get(), /*DiscardedValue*/ false); | |||
1386 | if (DeleteExpr.isInvalid()) | |||
1387 | return false; | |||
1388 | ||||
1389 | this->Allocate = NewExpr.get(); | |||
1390 | this->Deallocate = DeleteExpr.get(); | |||
1391 | ||||
1392 | return true; | |||
1393 | } | |||
1394 | ||||
1395 | bool CoroutineStmtBuilder::makeOnFallthrough() { | |||
1396 | assert(!IsPromiseDependentType &&(static_cast <bool> (!IsPromiseDependentType && "cannot make statement while the promise type is dependent") ? void (0) : __assert_fail ("!IsPromiseDependentType && \"cannot make statement while the promise type is dependent\"" , "/build/llvm-toolchain-snapshot-14~++20210828111110+16086d47c0d0/clang/lib/Sema/SemaCoroutine.cpp" , 1397, __extension__ __PRETTY_FUNCTION__)) | |||
1397 | "cannot make statement while the promise type is dependent")(static_cast <bool> (!IsPromiseDependentType && "cannot make statement while the promise type is dependent") ? void (0) : __assert_fail ("!IsPromiseDependentType && \"cannot make statement while the promise type is dependent\"" , "/build/llvm-toolchain-snapshot-14~++20210828111110+16086d47c0d0/clang/lib/Sema/SemaCoroutine.cpp" , 1397, __extension__ __PRETTY_FUNCTION__)); | |||
1398 | ||||
1399 | // [dcl.fct.def.coroutine]/4 | |||
1400 | // The unqualified-ids 'return_void' and 'return_value' are looked up in | |||
1401 | // the scope of class P. If both are found, the program is ill-formed. | |||
1402 | bool HasRVoid, HasRValue; | |||
1403 | LookupResult LRVoid = | |||
1404 | lookupMember(S, "return_void", PromiseRecordDecl, Loc, HasRVoid); | |||
1405 | LookupResult LRValue = | |||
1406 | lookupMember(S, "return_value", PromiseRecordDecl, Loc, HasRValue); | |||
1407 | ||||
1408 | StmtResult Fallthrough; | |||
1409 | if (HasRVoid && HasRValue) { | |||
1410 | // FIXME Improve this diagnostic | |||
1411 | S.Diag(FD.getLocation(), | |||
1412 | diag::err_coroutine_promise_incompatible_return_functions) | |||
1413 | << PromiseRecordDecl; | |||
1414 | S.Diag(LRVoid.getRepresentativeDecl()->getLocation(), | |||
1415 | diag::note_member_first_declared_here) | |||
1416 | << LRVoid.getLookupName(); | |||
1417 | S.Diag(LRValue.getRepresentativeDecl()->getLocation(), | |||
1418 | diag::note_member_first_declared_here) | |||
1419 | << LRValue.getLookupName(); | |||
1420 | return false; | |||
1421 | } else if (!HasRVoid && !HasRValue) { | |||
1422 | // FIXME: The PDTS currently specifies this case as UB, not ill-formed. | |||
1423 | // However we still diagnose this as an error since until the PDTS is fixed. | |||
1424 | S.Diag(FD.getLocation(), | |||
1425 | diag::err_coroutine_promise_requires_return_function) | |||
1426 | << PromiseRecordDecl; | |||
1427 | S.Diag(PromiseRecordDecl->getLocation(), diag::note_defined_here) | |||
1428 | << PromiseRecordDecl; | |||
1429 | return false; | |||
1430 | } else if (HasRVoid) { | |||
1431 | // If the unqualified-id return_void is found, flowing off the end of a | |||
1432 | // coroutine is equivalent to a co_return with no operand. Otherwise, | |||
1433 | // flowing off the end of a coroutine results in undefined behavior. | |||
1434 | Fallthrough = S.BuildCoreturnStmt(FD.getLocation(), nullptr, | |||
1435 | /*IsImplicit*/false); | |||
1436 | Fallthrough = S.ActOnFinishFullStmt(Fallthrough.get()); | |||
1437 | if (Fallthrough.isInvalid()) | |||
1438 | return false; | |||
1439 | } | |||
1440 | ||||
1441 | this->OnFallthrough = Fallthrough.get(); | |||
1442 | return true; | |||
1443 | } | |||
1444 | ||||
1445 | bool CoroutineStmtBuilder::makeOnException() { | |||
1446 | // Try to form 'p.unhandled_exception();' | |||
1447 | assert(!IsPromiseDependentType &&(static_cast <bool> (!IsPromiseDependentType && "cannot make statement while the promise type is dependent") ? void (0) : __assert_fail ("!IsPromiseDependentType && \"cannot make statement while the promise type is dependent\"" , "/build/llvm-toolchain-snapshot-14~++20210828111110+16086d47c0d0/clang/lib/Sema/SemaCoroutine.cpp" , 1448, __extension__ __PRETTY_FUNCTION__)) | |||
1448 | "cannot make statement while the promise type is dependent")(static_cast <bool> (!IsPromiseDependentType && "cannot make statement while the promise type is dependent") ? void (0) : __assert_fail ("!IsPromiseDependentType && \"cannot make statement while the promise type is dependent\"" , "/build/llvm-toolchain-snapshot-14~++20210828111110+16086d47c0d0/clang/lib/Sema/SemaCoroutine.cpp" , 1448, __extension__ __PRETTY_FUNCTION__)); | |||
1449 | ||||
1450 | const bool RequireUnhandledException = S.getLangOpts().CXXExceptions; | |||
1451 | ||||
1452 | if (!lookupMember(S, "unhandled_exception", PromiseRecordDecl, Loc)) { | |||
1453 | auto DiagID = | |||
1454 | RequireUnhandledException | |||
1455 | ? diag::err_coroutine_promise_unhandled_exception_required | |||
1456 | : diag:: | |||
1457 | warn_coroutine_promise_unhandled_exception_required_with_exceptions; | |||
1458 | S.Diag(Loc, DiagID) << PromiseRecordDecl; | |||
1459 | S.Diag(PromiseRecordDecl->getLocation(), diag::note_defined_here) | |||
1460 | << PromiseRecordDecl; | |||
1461 | return !RequireUnhandledException; | |||
1462 | } | |||
1463 | ||||
1464 | // If exceptions are disabled, don't try to build OnException. | |||
1465 | if (!S.getLangOpts().CXXExceptions) | |||
1466 | return true; | |||
1467 | ||||
1468 | ExprResult UnhandledException = buildPromiseCall(S, Fn.CoroutinePromise, Loc, | |||
1469 | "unhandled_exception", None); | |||
1470 | UnhandledException = S.ActOnFinishFullExpr(UnhandledException.get(), Loc, | |||
1471 | /*DiscardedValue*/ false); | |||
1472 | if (UnhandledException.isInvalid()) | |||
1473 | return false; | |||
1474 | ||||
1475 | // Since the body of the coroutine will be wrapped in try-catch, it will | |||
1476 | // be incompatible with SEH __try if present in a function. | |||
1477 | if (!S.getLangOpts().Borland && Fn.FirstSEHTryLoc.isValid()) { | |||
1478 | S.Diag(Fn.FirstSEHTryLoc, diag::err_seh_in_a_coroutine_with_cxx_exceptions); | |||
1479 | S.Diag(Fn.FirstCoroutineStmtLoc, diag::note_declared_coroutine_here) | |||
1480 | << Fn.getFirstCoroutineStmtKeyword(); | |||
1481 | return false; | |||
1482 | } | |||
1483 | ||||
1484 | this->OnException = UnhandledException.get(); | |||
1485 | return true; | |||
1486 | } | |||
1487 | ||||
1488 | bool CoroutineStmtBuilder::makeReturnObject() { | |||
1489 | // Build implicit 'p.get_return_object()' expression and form initialization | |||
1490 | // of return type from it. | |||
1491 | ExprResult ReturnObject = | |||
1492 | buildPromiseCall(S, Fn.CoroutinePromise, Loc, "get_return_object", None); | |||
1493 | if (ReturnObject.isInvalid()) | |||
1494 | return false; | |||
1495 | ||||
1496 | this->ReturnValue = ReturnObject.get(); | |||
1497 | return true; | |||
1498 | } | |||
1499 | ||||
1500 | static void noteMemberDeclaredHere(Sema &S, Expr *E, FunctionScopeInfo &Fn) { | |||
1501 | if (auto *MbrRef = dyn_cast<CXXMemberCallExpr>(E)) { | |||
1502 | auto *MethodDecl = MbrRef->getMethodDecl(); | |||
1503 | S.Diag(MethodDecl->getLocation(), diag::note_member_declared_here) | |||
1504 | << MethodDecl; | |||
1505 | } | |||
1506 | S.Diag(Fn.FirstCoroutineStmtLoc, diag::note_declared_coroutine_here) | |||
1507 | << Fn.getFirstCoroutineStmtKeyword(); | |||
1508 | } | |||
1509 | ||||
1510 | bool CoroutineStmtBuilder::makeGroDeclAndReturnStmt() { | |||
1511 | assert(!IsPromiseDependentType &&(static_cast <bool> (!IsPromiseDependentType && "cannot make statement while the promise type is dependent") ? void (0) : __assert_fail ("!IsPromiseDependentType && \"cannot make statement while the promise type is dependent\"" , "/build/llvm-toolchain-snapshot-14~++20210828111110+16086d47c0d0/clang/lib/Sema/SemaCoroutine.cpp" , 1512, __extension__ __PRETTY_FUNCTION__)) | |||
1512 | "cannot make statement while the promise type is dependent")(static_cast <bool> (!IsPromiseDependentType && "cannot make statement while the promise type is dependent") ? void (0) : __assert_fail ("!IsPromiseDependentType && \"cannot make statement while the promise type is dependent\"" , "/build/llvm-toolchain-snapshot-14~++20210828111110+16086d47c0d0/clang/lib/Sema/SemaCoroutine.cpp" , 1512, __extension__ __PRETTY_FUNCTION__)); | |||
1513 | assert(this->ReturnValue && "ReturnValue must be already formed")(static_cast <bool> (this->ReturnValue && "ReturnValue must be already formed" ) ? void (0) : __assert_fail ("this->ReturnValue && \"ReturnValue must be already formed\"" , "/build/llvm-toolchain-snapshot-14~++20210828111110+16086d47c0d0/clang/lib/Sema/SemaCoroutine.cpp" , 1513, __extension__ __PRETTY_FUNCTION__)); | |||
1514 | ||||
1515 | QualType const GroType = this->ReturnValue->getType(); | |||
1516 | assert(!GroType->isDependentType() &&(static_cast <bool> (!GroType->isDependentType() && "get_return_object type must no longer be dependent") ? void (0) : __assert_fail ("!GroType->isDependentType() && \"get_return_object type must no longer be dependent\"" , "/build/llvm-toolchain-snapshot-14~++20210828111110+16086d47c0d0/clang/lib/Sema/SemaCoroutine.cpp" , 1517, __extension__ __PRETTY_FUNCTION__)) | |||
1517 | "get_return_object type must no longer be dependent")(static_cast <bool> (!GroType->isDependentType() && "get_return_object type must no longer be dependent") ? void (0) : __assert_fail ("!GroType->isDependentType() && \"get_return_object type must no longer be dependent\"" , "/build/llvm-toolchain-snapshot-14~++20210828111110+16086d47c0d0/clang/lib/Sema/SemaCoroutine.cpp" , 1517, __extension__ __PRETTY_FUNCTION__)); | |||
1518 | ||||
1519 | QualType const FnRetType = FD.getReturnType(); | |||
1520 | assert(!FnRetType->isDependentType() &&(static_cast <bool> (!FnRetType->isDependentType() && "get_return_object type must no longer be dependent") ? void (0) : __assert_fail ("!FnRetType->isDependentType() && \"get_return_object type must no longer be dependent\"" , "/build/llvm-toolchain-snapshot-14~++20210828111110+16086d47c0d0/clang/lib/Sema/SemaCoroutine.cpp" , 1521, __extension__ __PRETTY_FUNCTION__)) | |||
1521 | "get_return_object type must no longer be dependent")(static_cast <bool> (!FnRetType->isDependentType() && "get_return_object type must no longer be dependent") ? void (0) : __assert_fail ("!FnRetType->isDependentType() && \"get_return_object type must no longer be dependent\"" , "/build/llvm-toolchain-snapshot-14~++20210828111110+16086d47c0d0/clang/lib/Sema/SemaCoroutine.cpp" , 1521, __extension__ __PRETTY_FUNCTION__)); | |||
1522 | ||||
1523 | if (FnRetType->isVoidType()) { | |||
1524 | ExprResult Res = | |||
1525 | S.ActOnFinishFullExpr(this->ReturnValue, Loc, /*DiscardedValue*/ false); | |||
1526 | if (Res.isInvalid()) | |||
1527 | return false; | |||
1528 | ||||
1529 | this->ResultDecl = Res.get(); | |||
1530 | return true; | |||
1531 | } | |||
1532 | ||||
1533 | if (GroType->isVoidType()) { | |||
1534 | // Trigger a nice error message. | |||
1535 | InitializedEntity Entity = | |||
1536 | InitializedEntity::InitializeResult(Loc, FnRetType, false); | |||
1537 | S.PerformCopyInitialization(Entity, SourceLocation(), ReturnValue); | |||
1538 | noteMemberDeclaredHere(S, ReturnValue, Fn); | |||
1539 | return false; | |||
1540 | } | |||
1541 | ||||
1542 | auto *GroDecl = VarDecl::Create( | |||
1543 | S.Context, &FD, FD.getLocation(), FD.getLocation(), | |||
1544 | &S.PP.getIdentifierTable().get("__coro_gro"), GroType, | |||
1545 | S.Context.getTrivialTypeSourceInfo(GroType, Loc), SC_None); | |||
1546 | GroDecl->setImplicit(); | |||
1547 | ||||
1548 | S.CheckVariableDeclarationType(GroDecl); | |||
1549 | if (GroDecl->isInvalidDecl()) | |||
1550 | return false; | |||
1551 | ||||
1552 | InitializedEntity Entity = InitializedEntity::InitializeVariable(GroDecl); | |||
1553 | ExprResult Res = | |||
1554 | S.PerformCopyInitialization(Entity, SourceLocation(), ReturnValue); | |||
1555 | if (Res.isInvalid()) | |||
1556 | return false; | |||
1557 | ||||
1558 | Res = S.ActOnFinishFullExpr(Res.get(), /*DiscardedValue*/ false); | |||
1559 | if (Res.isInvalid()) | |||
1560 | return false; | |||
1561 | ||||
1562 | S.AddInitializerToDecl(GroDecl, Res.get(), | |||
1563 | /*DirectInit=*/false); | |||
1564 | ||||
1565 | S.FinalizeDeclaration(GroDecl); | |||
1566 | ||||
1567 | // Form a declaration statement for the return declaration, so that AST | |||
1568 | // visitors can more easily find it. | |||
1569 | StmtResult GroDeclStmt = | |||
1570 | S.ActOnDeclStmt(S.ConvertDeclToDeclGroup(GroDecl), Loc, Loc); | |||
1571 | if (GroDeclStmt.isInvalid()) | |||
1572 | return false; | |||
1573 | ||||
1574 | this->ResultDecl = GroDeclStmt.get(); | |||
1575 | ||||
1576 | ExprResult declRef = S.BuildDeclRefExpr(GroDecl, GroType, VK_LValue, Loc); | |||
1577 | if (declRef.isInvalid()) | |||
1578 | return false; | |||
1579 | ||||
1580 | StmtResult ReturnStmt = S.BuildReturnStmt(Loc, declRef.get()); | |||
1581 | if (ReturnStmt.isInvalid()) { | |||
1582 | noteMemberDeclaredHere(S, ReturnValue, Fn); | |||
1583 | return false; | |||
1584 | } | |||
1585 | if (cast<clang::ReturnStmt>(ReturnStmt.get())->getNRVOCandidate() == GroDecl) | |||
1586 | GroDecl->setNRVOVariable(true); | |||
1587 | ||||
1588 | this->ReturnStmt = ReturnStmt.get(); | |||
1589 | return true; | |||
1590 | } | |||
1591 | ||||
1592 | // Create a static_cast\<T&&>(expr). | |||
1593 | static Expr *castForMoving(Sema &S, Expr *E, QualType T = QualType()) { | |||
1594 | if (T.isNull()) | |||
1595 | T = E->getType(); | |||
1596 | QualType TargetType = S.BuildReferenceType( | |||
1597 | T, /*SpelledAsLValue*/ false, SourceLocation(), DeclarationName()); | |||
1598 | SourceLocation ExprLoc = E->getBeginLoc(); | |||
1599 | TypeSourceInfo *TargetLoc = | |||
1600 | S.Context.getTrivialTypeSourceInfo(TargetType, ExprLoc); | |||
1601 | ||||
1602 | return S | |||
1603 | .BuildCXXNamedCast(ExprLoc, tok::kw_static_cast, TargetLoc, E, | |||
1604 | SourceRange(ExprLoc, ExprLoc), E->getSourceRange()) | |||
1605 | .get(); | |||
1606 | } | |||
1607 | ||||
1608 | /// Build a variable declaration for move parameter. | |||
1609 | static VarDecl *buildVarDecl(Sema &S, SourceLocation Loc, QualType Type, | |||
1610 | IdentifierInfo *II) { | |||
1611 | TypeSourceInfo *TInfo = S.Context.getTrivialTypeSourceInfo(Type, Loc); | |||
1612 | VarDecl *Decl = VarDecl::Create(S.Context, S.CurContext, Loc, Loc, II, Type, | |||
1613 | TInfo, SC_None); | |||
1614 | Decl->setImplicit(); | |||
1615 | return Decl; | |||
1616 | } | |||
1617 | ||||
1618 | // Build statements that move coroutine function parameters to the coroutine | |||
1619 | // frame, and store them on the function scope info. | |||
1620 | bool Sema::buildCoroutineParameterMoves(SourceLocation Loc) { | |||
1621 | assert(isa<FunctionDecl>(CurContext) && "not in a function scope")(static_cast <bool> (isa<FunctionDecl>(CurContext ) && "not in a function scope") ? void (0) : __assert_fail ("isa<FunctionDecl>(CurContext) && \"not in a function scope\"" , "/build/llvm-toolchain-snapshot-14~++20210828111110+16086d47c0d0/clang/lib/Sema/SemaCoroutine.cpp" , 1621, __extension__ __PRETTY_FUNCTION__)); | |||
1622 | auto *FD = cast<FunctionDecl>(CurContext); | |||
1623 | ||||
1624 | auto *ScopeInfo = getCurFunction(); | |||
1625 | if (!ScopeInfo->CoroutineParameterMoves.empty()) | |||
1626 | return false; | |||
1627 | ||||
1628 | for (auto *PD : FD->parameters()) { | |||
1629 | if (PD->getType()->isDependentType()) | |||
1630 | continue; | |||
1631 | ||||
1632 | ExprResult PDRefExpr = | |||
1633 | BuildDeclRefExpr(PD, PD->getType().getNonReferenceType(), | |||
1634 | ExprValueKind::VK_LValue, Loc); // FIXME: scope? | |||
1635 | if (PDRefExpr.isInvalid()) | |||
1636 | return false; | |||
1637 | ||||
1638 | Expr *CExpr = nullptr; | |||
1639 | if (PD->getType()->getAsCXXRecordDecl() || | |||
1640 | PD->getType()->isRValueReferenceType()) | |||
1641 | CExpr = castForMoving(*this, PDRefExpr.get()); | |||
1642 | else | |||
1643 | CExpr = PDRefExpr.get(); | |||
1644 | ||||
1645 | auto D = buildVarDecl(*this, Loc, PD->getType(), PD->getIdentifier()); | |||
1646 | AddInitializerToDecl(D, CExpr, /*DirectInit=*/true); | |||
1647 | ||||
1648 | // Convert decl to a statement. | |||
1649 | StmtResult Stmt = ActOnDeclStmt(ConvertDeclToDeclGroup(D), Loc, Loc); | |||
1650 | if (Stmt.isInvalid()) | |||
1651 | return false; | |||
1652 | ||||
1653 | ScopeInfo->CoroutineParameterMoves.insert(std::make_pair(PD, Stmt.get())); | |||
1654 | } | |||
1655 | return true; | |||
1656 | } | |||
1657 | ||||
1658 | StmtResult Sema::BuildCoroutineBodyStmt(CoroutineBodyStmt::CtorArgs Args) { | |||
1659 | CoroutineBodyStmt *Res = CoroutineBodyStmt::Create(Context, Args); | |||
1660 | if (!Res) | |||
1661 | return StmtError(); | |||
1662 | return Res; | |||
1663 | } | |||
1664 | ||||
1665 | ClassTemplateDecl *Sema::lookupCoroutineTraits(SourceLocation KwLoc, | |||
1666 | SourceLocation FuncLoc) { | |||
1667 | if (!StdCoroutineTraitsCache) { | |||
1668 | if (auto StdExp = lookupStdExperimentalNamespace()) { | |||
1669 | LookupResult Result(*this, | |||
1670 | &PP.getIdentifierTable().get("coroutine_traits"), | |||
1671 | FuncLoc, LookupOrdinaryName); | |||
1672 | if (!LookupQualifiedName(Result, StdExp)) { | |||
1673 | Diag(KwLoc, diag::err_implied_coroutine_type_not_found) | |||
1674 | << "std::experimental::coroutine_traits"; | |||
1675 | return nullptr; | |||
1676 | } | |||
1677 | if (!(StdCoroutineTraitsCache = | |||
1678 | Result.getAsSingle<ClassTemplateDecl>())) { | |||
1679 | Result.suppressDiagnostics(); | |||
1680 | NamedDecl *Found = *Result.begin(); | |||
1681 | Diag(Found->getLocation(), diag::err_malformed_std_coroutine_traits); | |||
1682 | return nullptr; | |||
1683 | } | |||
1684 | } | |||
1685 | } | |||
1686 | return StdCoroutineTraitsCache; | |||
1687 | } |