File: | tools/clang/lib/Sema/SemaCoroutine.cpp |
Warning: | line 1295, column 12 Called C++ object pointer is null |
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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/ASTLambda.h" | |||
16 | #include "clang/AST/Decl.h" | |||
17 | #include "clang/AST/ExprCXX.h" | |||
18 | #include "clang/AST/StmtCXX.h" | |||
19 | #include "clang/Lex/Preprocessor.h" | |||
20 | #include "clang/Sema/Initialization.h" | |||
21 | #include "clang/Sema/Overload.h" | |||
22 | #include "clang/Sema/ScopeInfo.h" | |||
23 | #include "clang/Sema/SemaInternal.h" | |||
24 | ||||
25 | using namespace clang; | |||
26 | using namespace sema; | |||
27 | ||||
28 | static LookupResult lookupMember(Sema &S, const char *Name, CXXRecordDecl *RD, | |||
29 | SourceLocation Loc, bool &Res) { | |||
30 | DeclarationName DN = S.PP.getIdentifierInfo(Name); | |||
31 | LookupResult LR(S, DN, Loc, Sema::LookupMemberName); | |||
32 | // Suppress diagnostics when a private member is selected. The same warnings | |||
33 | // will be produced again when building the call. | |||
34 | LR.suppressDiagnostics(); | |||
35 | Res = S.LookupQualifiedName(LR, RD); | |||
36 | return LR; | |||
37 | } | |||
38 | ||||
39 | static bool lookupMember(Sema &S, const char *Name, CXXRecordDecl *RD, | |||
40 | SourceLocation Loc) { | |||
41 | bool Res; | |||
42 | lookupMember(S, Name, RD, Loc, Res); | |||
43 | return Res; | |||
44 | } | |||
45 | ||||
46 | /// Look up the std::coroutine_traits<...>::promise_type for the given | |||
47 | /// function type. | |||
48 | static QualType lookupPromiseType(Sema &S, const FunctionDecl *FD, | |||
49 | SourceLocation KwLoc) { | |||
50 | const FunctionProtoType *FnType = FD->getType()->castAs<FunctionProtoType>(); | |||
51 | const SourceLocation FuncLoc = FD->getLocation(); | |||
52 | // FIXME: Cache std::coroutine_traits once we've found it. | |||
53 | NamespaceDecl *StdExp = S.lookupStdExperimentalNamespace(); | |||
54 | if (!StdExp) { | |||
55 | S.Diag(KwLoc, diag::err_implied_coroutine_type_not_found) | |||
56 | << "std::experimental::coroutine_traits"; | |||
57 | return QualType(); | |||
58 | } | |||
59 | ||||
60 | LookupResult Result(S, &S.PP.getIdentifierTable().get("coroutine_traits"), | |||
61 | FuncLoc, Sema::LookupOrdinaryName); | |||
62 | if (!S.LookupQualifiedName(Result, StdExp)) { | |||
63 | S.Diag(KwLoc, diag::err_implied_coroutine_type_not_found) | |||
64 | << "std::experimental::coroutine_traits"; | |||
65 | return QualType(); | |||
66 | } | |||
67 | ||||
68 | ClassTemplateDecl *CoroTraits = Result.getAsSingle<ClassTemplateDecl>(); | |||
69 | if (!CoroTraits) { | |||
70 | Result.suppressDiagnostics(); | |||
71 | // We found something weird. Complain about the first thing we found. | |||
72 | NamedDecl *Found = *Result.begin(); | |||
73 | S.Diag(Found->getLocation(), diag::err_malformed_std_coroutine_traits); | |||
74 | return QualType(); | |||
75 | } | |||
76 | ||||
77 | // Form template argument list for coroutine_traits<R, P1, P2, ...> according | |||
78 | // to [dcl.fct.def.coroutine]3 | |||
79 | TemplateArgumentListInfo Args(KwLoc, KwLoc); | |||
80 | auto AddArg = [&](QualType T) { | |||
81 | Args.addArgument(TemplateArgumentLoc( | |||
82 | TemplateArgument(T), S.Context.getTrivialTypeSourceInfo(T, KwLoc))); | |||
83 | }; | |||
84 | AddArg(FnType->getReturnType()); | |||
85 | // If the function is a non-static member function, add the type | |||
86 | // of the implicit object parameter before the formal parameters. | |||
87 | if (auto *MD = dyn_cast<CXXMethodDecl>(FD)) { | |||
88 | if (MD->isInstance()) { | |||
89 | // [over.match.funcs]4 | |||
90 | // For non-static member functions, the type of the implicit object | |||
91 | // parameter is | |||
92 | // -- "lvalue reference to cv X" for functions declared without a | |||
93 | // ref-qualifier or with the & ref-qualifier | |||
94 | // -- "rvalue reference to cv X" for functions declared with the && | |||
95 | // ref-qualifier | |||
96 | QualType T = | |||
97 | MD->getThisType(S.Context)->getAs<PointerType>()->getPointeeType(); | |||
98 | T = FnType->getRefQualifier() == RQ_RValue | |||
99 | ? S.Context.getRValueReferenceType(T) | |||
100 | : S.Context.getLValueReferenceType(T, /*SpelledAsLValue*/ true); | |||
101 | AddArg(T); | |||
102 | } | |||
103 | } | |||
104 | for (QualType T : FnType->getParamTypes()) | |||
105 | AddArg(T); | |||
106 | ||||
107 | // Build the template-id. | |||
108 | QualType CoroTrait = | |||
109 | S.CheckTemplateIdType(TemplateName(CoroTraits), KwLoc, Args); | |||
110 | if (CoroTrait.isNull()) | |||
111 | return QualType(); | |||
112 | if (S.RequireCompleteType(KwLoc, CoroTrait, | |||
113 | diag::err_coroutine_type_missing_specialization)) | |||
114 | return QualType(); | |||
115 | ||||
116 | auto *RD = CoroTrait->getAsCXXRecordDecl(); | |||
117 | 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-7~svn329677/tools/clang/lib/Sema/SemaCoroutine.cpp" , 117, __extension__ __PRETTY_FUNCTION__)); | |||
118 | ||||
119 | // Look up the ::promise_type member. | |||
120 | LookupResult R(S, &S.PP.getIdentifierTable().get("promise_type"), KwLoc, | |||
121 | Sema::LookupOrdinaryName); | |||
122 | S.LookupQualifiedName(R, RD); | |||
123 | auto *Promise = R.getAsSingle<TypeDecl>(); | |||
124 | if (!Promise) { | |||
125 | S.Diag(FuncLoc, | |||
126 | diag::err_implied_std_coroutine_traits_promise_type_not_found) | |||
127 | << RD; | |||
128 | return QualType(); | |||
129 | } | |||
130 | // The promise type is required to be a class type. | |||
131 | QualType PromiseType = S.Context.getTypeDeclType(Promise); | |||
132 | ||||
133 | auto buildElaboratedType = [&]() { | |||
134 | auto *NNS = NestedNameSpecifier::Create(S.Context, nullptr, StdExp); | |||
135 | NNS = NestedNameSpecifier::Create(S.Context, NNS, false, | |||
136 | CoroTrait.getTypePtr()); | |||
137 | return S.Context.getElaboratedType(ETK_None, NNS, PromiseType); | |||
138 | }; | |||
139 | ||||
140 | if (!PromiseType->getAsCXXRecordDecl()) { | |||
141 | S.Diag(FuncLoc, | |||
142 | diag::err_implied_std_coroutine_traits_promise_type_not_class) | |||
143 | << buildElaboratedType(); | |||
144 | return QualType(); | |||
145 | } | |||
146 | if (S.RequireCompleteType(FuncLoc, buildElaboratedType(), | |||
147 | diag::err_coroutine_promise_type_incomplete)) | |||
148 | return QualType(); | |||
149 | ||||
150 | return PromiseType; | |||
151 | } | |||
152 | ||||
153 | /// Look up the std::experimental::coroutine_handle<PromiseType>. | |||
154 | static QualType lookupCoroutineHandleType(Sema &S, QualType PromiseType, | |||
155 | SourceLocation Loc) { | |||
156 | if (PromiseType.isNull()) | |||
157 | return QualType(); | |||
158 | ||||
159 | NamespaceDecl *StdExp = S.lookupStdExperimentalNamespace(); | |||
160 | 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-7~svn329677/tools/clang/lib/Sema/SemaCoroutine.cpp" , 160, __extension__ __PRETTY_FUNCTION__)); | |||
161 | ||||
162 | LookupResult Result(S, &S.PP.getIdentifierTable().get("coroutine_handle"), | |||
163 | Loc, Sema::LookupOrdinaryName); | |||
164 | if (!S.LookupQualifiedName(Result, StdExp)) { | |||
165 | S.Diag(Loc, diag::err_implied_coroutine_type_not_found) | |||
166 | << "std::experimental::coroutine_handle"; | |||
167 | return QualType(); | |||
168 | } | |||
169 | ||||
170 | ClassTemplateDecl *CoroHandle = Result.getAsSingle<ClassTemplateDecl>(); | |||
171 | if (!CoroHandle) { | |||
172 | Result.suppressDiagnostics(); | |||
173 | // We found something weird. Complain about the first thing we found. | |||
174 | NamedDecl *Found = *Result.begin(); | |||
175 | S.Diag(Found->getLocation(), diag::err_malformed_std_coroutine_handle); | |||
176 | return QualType(); | |||
177 | } | |||
178 | ||||
179 | // Form template argument list for coroutine_handle<Promise>. | |||
180 | TemplateArgumentListInfo Args(Loc, Loc); | |||
181 | Args.addArgument(TemplateArgumentLoc( | |||
182 | TemplateArgument(PromiseType), | |||
183 | S.Context.getTrivialTypeSourceInfo(PromiseType, Loc))); | |||
184 | ||||
185 | // Build the template-id. | |||
186 | QualType CoroHandleType = | |||
187 | S.CheckTemplateIdType(TemplateName(CoroHandle), Loc, Args); | |||
188 | if (CoroHandleType.isNull()) | |||
189 | return QualType(); | |||
190 | if (S.RequireCompleteType(Loc, CoroHandleType, | |||
191 | diag::err_coroutine_type_missing_specialization)) | |||
192 | return QualType(); | |||
193 | ||||
194 | return CoroHandleType; | |||
195 | } | |||
196 | ||||
197 | static bool isValidCoroutineContext(Sema &S, SourceLocation Loc, | |||
198 | StringRef Keyword) { | |||
199 | // 'co_await' and 'co_yield' are not permitted in unevaluated operands. | |||
200 | if (S.isUnevaluatedContext()) { | |||
201 | S.Diag(Loc, diag::err_coroutine_unevaluated_context) << Keyword; | |||
202 | return false; | |||
203 | } | |||
204 | ||||
205 | // Any other usage must be within a function. | |||
206 | auto *FD = dyn_cast<FunctionDecl>(S.CurContext); | |||
207 | if (!FD) { | |||
208 | S.Diag(Loc, isa<ObjCMethodDecl>(S.CurContext) | |||
209 | ? diag::err_coroutine_objc_method | |||
210 | : diag::err_coroutine_outside_function) << Keyword; | |||
211 | return false; | |||
212 | } | |||
213 | ||||
214 | // An enumeration for mapping the diagnostic type to the correct diagnostic | |||
215 | // selection index. | |||
216 | enum InvalidFuncDiag { | |||
217 | DiagCtor = 0, | |||
218 | DiagDtor, | |||
219 | DiagCopyAssign, | |||
220 | DiagMoveAssign, | |||
221 | DiagMain, | |||
222 | DiagConstexpr, | |||
223 | DiagAutoRet, | |||
224 | DiagVarargs, | |||
225 | }; | |||
226 | bool Diagnosed = false; | |||
227 | auto DiagInvalid = [&](InvalidFuncDiag ID) { | |||
228 | S.Diag(Loc, diag::err_coroutine_invalid_func_context) << ID << Keyword; | |||
229 | Diagnosed = true; | |||
230 | return false; | |||
231 | }; | |||
232 | ||||
233 | // Diagnose when a constructor, destructor, copy/move assignment operator, | |||
234 | // or the function 'main' are declared as a coroutine. | |||
235 | auto *MD = dyn_cast<CXXMethodDecl>(FD); | |||
236 | if (MD && isa<CXXConstructorDecl>(MD)) | |||
237 | return DiagInvalid(DiagCtor); | |||
238 | else if (MD && isa<CXXDestructorDecl>(MD)) | |||
239 | return DiagInvalid(DiagDtor); | |||
240 | else if (MD && MD->isCopyAssignmentOperator()) | |||
241 | return DiagInvalid(DiagCopyAssign); | |||
242 | else if (MD && MD->isMoveAssignmentOperator()) | |||
243 | return DiagInvalid(DiagMoveAssign); | |||
244 | else if (FD->isMain()) | |||
245 | return DiagInvalid(DiagMain); | |||
246 | ||||
247 | // Emit a diagnostics for each of the following conditions which is not met. | |||
248 | if (FD->isConstexpr()) | |||
249 | DiagInvalid(DiagConstexpr); | |||
250 | if (FD->getReturnType()->isUndeducedType()) | |||
251 | DiagInvalid(DiagAutoRet); | |||
252 | if (FD->isVariadic()) | |||
253 | DiagInvalid(DiagVarargs); | |||
254 | ||||
255 | return !Diagnosed; | |||
256 | } | |||
257 | ||||
258 | static ExprResult buildOperatorCoawaitLookupExpr(Sema &SemaRef, Scope *S, | |||
259 | SourceLocation Loc) { | |||
260 | DeclarationName OpName = | |||
261 | SemaRef.Context.DeclarationNames.getCXXOperatorName(OO_Coawait); | |||
262 | LookupResult Operators(SemaRef, OpName, SourceLocation(), | |||
263 | Sema::LookupOperatorName); | |||
264 | SemaRef.LookupName(Operators, S); | |||
265 | ||||
266 | 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-7~svn329677/tools/clang/lib/Sema/SemaCoroutine.cpp" , 266, __extension__ __PRETTY_FUNCTION__)); | |||
267 | const auto &Functions = Operators.asUnresolvedSet(); | |||
268 | bool IsOverloaded = | |||
269 | Functions.size() > 1 || | |||
270 | (Functions.size() == 1 && isa<FunctionTemplateDecl>(*Functions.begin())); | |||
271 | Expr *CoawaitOp = UnresolvedLookupExpr::Create( | |||
272 | SemaRef.Context, /*NamingClass*/ nullptr, NestedNameSpecifierLoc(), | |||
273 | DeclarationNameInfo(OpName, Loc), /*RequiresADL*/ true, IsOverloaded, | |||
274 | Functions.begin(), Functions.end()); | |||
275 | assert(CoawaitOp)(static_cast <bool> (CoawaitOp) ? void (0) : __assert_fail ("CoawaitOp", "/build/llvm-toolchain-snapshot-7~svn329677/tools/clang/lib/Sema/SemaCoroutine.cpp" , 275, __extension__ __PRETTY_FUNCTION__)); | |||
276 | return CoawaitOp; | |||
277 | } | |||
278 | ||||
279 | /// Build a call to 'operator co_await' if there is a suitable operator for | |||
280 | /// the given expression. | |||
281 | static ExprResult buildOperatorCoawaitCall(Sema &SemaRef, SourceLocation Loc, | |||
282 | Expr *E, | |||
283 | UnresolvedLookupExpr *Lookup) { | |||
284 | UnresolvedSet<16> Functions; | |||
285 | Functions.append(Lookup->decls_begin(), Lookup->decls_end()); | |||
286 | return SemaRef.CreateOverloadedUnaryOp(Loc, UO_Coawait, Functions, E); | |||
287 | } | |||
288 | ||||
289 | static ExprResult buildOperatorCoawaitCall(Sema &SemaRef, Scope *S, | |||
290 | SourceLocation Loc, Expr *E) { | |||
291 | ExprResult R = buildOperatorCoawaitLookupExpr(SemaRef, S, Loc); | |||
292 | if (R.isInvalid()) | |||
293 | return ExprError(); | |||
294 | return buildOperatorCoawaitCall(SemaRef, Loc, E, | |||
295 | cast<UnresolvedLookupExpr>(R.get())); | |||
296 | } | |||
297 | ||||
298 | static Expr *buildBuiltinCall(Sema &S, SourceLocation Loc, Builtin::ID Id, | |||
299 | MultiExprArg CallArgs) { | |||
300 | StringRef Name = S.Context.BuiltinInfo.getName(Id); | |||
301 | LookupResult R(S, &S.Context.Idents.get(Name), Loc, Sema::LookupOrdinaryName); | |||
302 | S.LookupName(R, S.TUScope, /*AllowBuiltinCreation=*/true); | |||
303 | ||||
304 | auto *BuiltInDecl = R.getAsSingle<FunctionDecl>(); | |||
305 | assert(BuiltInDecl && "failed to find builtin declaration")(static_cast <bool> (BuiltInDecl && "failed to find builtin declaration" ) ? void (0) : __assert_fail ("BuiltInDecl && \"failed to find builtin declaration\"" , "/build/llvm-toolchain-snapshot-7~svn329677/tools/clang/lib/Sema/SemaCoroutine.cpp" , 305, __extension__ __PRETTY_FUNCTION__)); | |||
306 | ||||
307 | ExprResult DeclRef = | |||
308 | S.BuildDeclRefExpr(BuiltInDecl, BuiltInDecl->getType(), VK_LValue, Loc); | |||
309 | assert(DeclRef.isUsable() && "Builtin reference cannot fail")(static_cast <bool> (DeclRef.isUsable() && "Builtin reference cannot fail" ) ? void (0) : __assert_fail ("DeclRef.isUsable() && \"Builtin reference cannot fail\"" , "/build/llvm-toolchain-snapshot-7~svn329677/tools/clang/lib/Sema/SemaCoroutine.cpp" , 309, __extension__ __PRETTY_FUNCTION__)); | |||
310 | ||||
311 | ExprResult Call = | |||
312 | S.ActOnCallExpr(/*Scope=*/nullptr, DeclRef.get(), Loc, CallArgs, Loc); | |||
313 | ||||
314 | assert(!Call.isInvalid() && "Call to builtin cannot fail!")(static_cast <bool> (!Call.isInvalid() && "Call to builtin cannot fail!" ) ? void (0) : __assert_fail ("!Call.isInvalid() && \"Call to builtin cannot fail!\"" , "/build/llvm-toolchain-snapshot-7~svn329677/tools/clang/lib/Sema/SemaCoroutine.cpp" , 314, __extension__ __PRETTY_FUNCTION__)); | |||
315 | return Call.get(); | |||
316 | } | |||
317 | ||||
318 | static ExprResult buildCoroutineHandle(Sema &S, QualType PromiseType, | |||
319 | SourceLocation Loc) { | |||
320 | QualType CoroHandleType = lookupCoroutineHandleType(S, PromiseType, Loc); | |||
321 | if (CoroHandleType.isNull()) | |||
322 | return ExprError(); | |||
323 | ||||
324 | DeclContext *LookupCtx = S.computeDeclContext(CoroHandleType); | |||
325 | LookupResult Found(S, &S.PP.getIdentifierTable().get("from_address"), Loc, | |||
326 | Sema::LookupOrdinaryName); | |||
327 | if (!S.LookupQualifiedName(Found, LookupCtx)) { | |||
328 | S.Diag(Loc, diag::err_coroutine_handle_missing_member) | |||
329 | << "from_address"; | |||
330 | return ExprError(); | |||
331 | } | |||
332 | ||||
333 | Expr *FramePtr = | |||
334 | buildBuiltinCall(S, Loc, Builtin::BI__builtin_coro_frame, {}); | |||
335 | ||||
336 | CXXScopeSpec SS; | |||
337 | ExprResult FromAddr = | |||
338 | S.BuildDeclarationNameExpr(SS, Found, /*NeedsADL=*/false); | |||
339 | if (FromAddr.isInvalid()) | |||
340 | return ExprError(); | |||
341 | ||||
342 | return S.ActOnCallExpr(nullptr, FromAddr.get(), Loc, FramePtr, Loc); | |||
343 | } | |||
344 | ||||
345 | struct ReadySuspendResumeResult { | |||
346 | enum AwaitCallType { ACT_Ready, ACT_Suspend, ACT_Resume }; | |||
347 | Expr *Results[3]; | |||
348 | OpaqueValueExpr *OpaqueValue; | |||
349 | bool IsInvalid; | |||
350 | }; | |||
351 | ||||
352 | static ExprResult buildMemberCall(Sema &S, Expr *Base, SourceLocation Loc, | |||
353 | StringRef Name, MultiExprArg Args) { | |||
354 | DeclarationNameInfo NameInfo(&S.PP.getIdentifierTable().get(Name), Loc); | |||
355 | ||||
356 | // FIXME: Fix BuildMemberReferenceExpr to take a const CXXScopeSpec&. | |||
357 | CXXScopeSpec SS; | |||
358 | ExprResult Result = S.BuildMemberReferenceExpr( | |||
359 | Base, Base->getType(), Loc, /*IsPtr=*/false, SS, | |||
360 | SourceLocation(), nullptr, NameInfo, /*TemplateArgs=*/nullptr, | |||
361 | /*Scope=*/nullptr); | |||
362 | if (Result.isInvalid()) | |||
363 | return ExprError(); | |||
364 | ||||
365 | // We meant exactly what we asked for. No need for typo correction. | |||
366 | if (auto *TE = dyn_cast<TypoExpr>(Result.get())) { | |||
367 | S.clearDelayedTypo(TE); | |||
368 | S.Diag(Loc, diag::err_no_member) | |||
369 | << NameInfo.getName() << Base->getType()->getAsCXXRecordDecl() | |||
370 | << Base->getSourceRange(); | |||
371 | return ExprError(); | |||
372 | } | |||
373 | ||||
374 | return S.ActOnCallExpr(nullptr, Result.get(), Loc, Args, Loc, nullptr); | |||
375 | } | |||
376 | ||||
377 | // See if return type is coroutine-handle and if so, invoke builtin coro-resume | |||
378 | // on its address. This is to enable experimental support for coroutine-handle | |||
379 | // returning await_suspend that results in a guaranteed tail call to the target | |||
380 | // coroutine. | |||
381 | static Expr *maybeTailCall(Sema &S, QualType RetType, Expr *E, | |||
382 | SourceLocation Loc) { | |||
383 | if (RetType->isReferenceType()) | |||
384 | return nullptr; | |||
385 | Type const *T = RetType.getTypePtr(); | |||
386 | if (!T->isClassType() && !T->isStructureType()) | |||
387 | return nullptr; | |||
388 | ||||
389 | // FIXME: Add convertability check to coroutine_handle<>. Possibly via | |||
390 | // EvaluateBinaryTypeTrait(BTT_IsConvertible, ...) which is at the moment | |||
391 | // a private function in SemaExprCXX.cpp | |||
392 | ||||
393 | ExprResult AddressExpr = buildMemberCall(S, E, Loc, "address", None); | |||
394 | if (AddressExpr.isInvalid()) | |||
395 | return nullptr; | |||
396 | ||||
397 | Expr *JustAddress = AddressExpr.get(); | |||
398 | // FIXME: Check that the type of AddressExpr is void* | |||
399 | return buildBuiltinCall(S, Loc, Builtin::BI__builtin_coro_resume, | |||
400 | JustAddress); | |||
401 | } | |||
402 | ||||
403 | /// Build calls to await_ready, await_suspend, and await_resume for a co_await | |||
404 | /// expression. | |||
405 | static ReadySuspendResumeResult buildCoawaitCalls(Sema &S, VarDecl *CoroPromise, | |||
406 | SourceLocation Loc, Expr *E) { | |||
407 | OpaqueValueExpr *Operand = new (S.Context) | |||
408 | OpaqueValueExpr(Loc, E->getType(), VK_LValue, E->getObjectKind(), E); | |||
409 | ||||
410 | // Assume invalid until we see otherwise. | |||
411 | ReadySuspendResumeResult Calls = {{}, Operand, /*IsInvalid=*/true}; | |||
412 | ||||
413 | ExprResult CoroHandleRes = buildCoroutineHandle(S, CoroPromise->getType(), Loc); | |||
414 | if (CoroHandleRes.isInvalid()) | |||
415 | return Calls; | |||
416 | Expr *CoroHandle = CoroHandleRes.get(); | |||
417 | ||||
418 | const StringRef Funcs[] = {"await_ready", "await_suspend", "await_resume"}; | |||
419 | MultiExprArg Args[] = {None, CoroHandle, None}; | |||
420 | for (size_t I = 0, N = llvm::array_lengthof(Funcs); I != N; ++I) { | |||
421 | ExprResult Result = buildMemberCall(S, Operand, Loc, Funcs[I], Args[I]); | |||
422 | if (Result.isInvalid()) | |||
423 | return Calls; | |||
424 | Calls.Results[I] = Result.get(); | |||
425 | } | |||
426 | ||||
427 | // Assume the calls are valid; all further checking should make them invalid. | |||
428 | Calls.IsInvalid = false; | |||
429 | ||||
430 | using ACT = ReadySuspendResumeResult::AwaitCallType; | |||
431 | CallExpr *AwaitReady = cast<CallExpr>(Calls.Results[ACT::ACT_Ready]); | |||
432 | if (!AwaitReady->getType()->isDependentType()) { | |||
433 | // [expr.await]p3 [...] | |||
434 | // — await-ready is the expression e.await_ready(), contextually converted | |||
435 | // to bool. | |||
436 | ExprResult Conv = S.PerformContextuallyConvertToBool(AwaitReady); | |||
437 | if (Conv.isInvalid()) { | |||
438 | S.Diag(AwaitReady->getDirectCallee()->getLocStart(), | |||
439 | diag::note_await_ready_no_bool_conversion); | |||
440 | S.Diag(Loc, diag::note_coroutine_promise_call_implicitly_required) | |||
441 | << AwaitReady->getDirectCallee() << E->getSourceRange(); | |||
442 | Calls.IsInvalid = true; | |||
443 | } | |||
444 | Calls.Results[ACT::ACT_Ready] = Conv.get(); | |||
445 | } | |||
446 | CallExpr *AwaitSuspend = cast<CallExpr>(Calls.Results[ACT::ACT_Suspend]); | |||
447 | if (!AwaitSuspend->getType()->isDependentType()) { | |||
448 | // [expr.await]p3 [...] | |||
449 | // - await-suspend is the expression e.await_suspend(h), which shall be | |||
450 | // a prvalue of type void or bool. | |||
451 | QualType RetType = AwaitSuspend->getCallReturnType(S.Context); | |||
452 | ||||
453 | // Experimental support for coroutine_handle returning await_suspend. | |||
454 | if (Expr *TailCallSuspend = maybeTailCall(S, RetType, AwaitSuspend, Loc)) | |||
455 | Calls.Results[ACT::ACT_Suspend] = TailCallSuspend; | |||
456 | else { | |||
457 | // non-class prvalues always have cv-unqualified types | |||
458 | if (RetType->isReferenceType() || | |||
459 | (!RetType->isBooleanType() && !RetType->isVoidType())) { | |||
460 | S.Diag(AwaitSuspend->getCalleeDecl()->getLocation(), | |||
461 | diag::err_await_suspend_invalid_return_type) | |||
462 | << RetType; | |||
463 | S.Diag(Loc, diag::note_coroutine_promise_call_implicitly_required) | |||
464 | << AwaitSuspend->getDirectCallee(); | |||
465 | Calls.IsInvalid = true; | |||
466 | } | |||
467 | } | |||
468 | } | |||
469 | ||||
470 | return Calls; | |||
471 | } | |||
472 | ||||
473 | static ExprResult buildPromiseCall(Sema &S, VarDecl *Promise, | |||
474 | SourceLocation Loc, StringRef Name, | |||
475 | MultiExprArg Args) { | |||
476 | ||||
477 | // Form a reference to the promise. | |||
478 | ExprResult PromiseRef = S.BuildDeclRefExpr( | |||
479 | Promise, Promise->getType().getNonReferenceType(), VK_LValue, Loc); | |||
480 | if (PromiseRef.isInvalid()) | |||
481 | return ExprError(); | |||
482 | ||||
483 | return buildMemberCall(S, PromiseRef.get(), Loc, Name, Args); | |||
484 | } | |||
485 | ||||
486 | VarDecl *Sema::buildCoroutinePromise(SourceLocation Loc) { | |||
487 | 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-7~svn329677/tools/clang/lib/Sema/SemaCoroutine.cpp" , 487, __extension__ __PRETTY_FUNCTION__)); | |||
488 | auto *FD = cast<FunctionDecl>(CurContext); | |||
489 | bool IsThisDependentType = [&] { | |||
490 | if (auto *MD = dyn_cast_or_null<CXXMethodDecl>(FD)) | |||
491 | return MD->isInstance() && MD->getThisType(Context)->isDependentType(); | |||
492 | else | |||
493 | return false; | |||
494 | }(); | |||
495 | ||||
496 | QualType T = FD->getType()->isDependentType() || IsThisDependentType | |||
497 | ? Context.DependentTy | |||
498 | : lookupPromiseType(*this, FD, Loc); | |||
499 | if (T.isNull()) | |||
500 | return nullptr; | |||
501 | ||||
502 | auto *VD = VarDecl::Create(Context, FD, FD->getLocation(), FD->getLocation(), | |||
503 | &PP.getIdentifierTable().get("__promise"), T, | |||
504 | Context.getTrivialTypeSourceInfo(T, Loc), SC_None); | |||
505 | CheckVariableDeclarationType(VD); | |||
506 | if (VD->isInvalidDecl()) | |||
507 | return nullptr; | |||
508 | ||||
509 | auto *ScopeInfo = getCurFunction(); | |||
510 | // Build a list of arguments, based on the coroutine functions arguments, | |||
511 | // that will be passed to the promise type's constructor. | |||
512 | llvm::SmallVector<Expr *, 4> CtorArgExprs; | |||
513 | auto &Moves = ScopeInfo->CoroutineParameterMoves; | |||
514 | for (auto *PD : FD->parameters()) { | |||
515 | if (PD->getType()->isDependentType()) | |||
516 | continue; | |||
517 | ||||
518 | auto RefExpr = ExprEmpty(); | |||
519 | auto Move = Moves.find(PD); | |||
520 | 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-7~svn329677/tools/clang/lib/Sema/SemaCoroutine.cpp" , 521, __extension__ __PRETTY_FUNCTION__)) | |||
521 | "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-7~svn329677/tools/clang/lib/Sema/SemaCoroutine.cpp" , 521, __extension__ __PRETTY_FUNCTION__)); | |||
522 | // If a reference to the function parameter exists in the coroutine | |||
523 | // frame, use that reference. | |||
524 | auto *MoveDecl = | |||
525 | cast<VarDecl>(cast<DeclStmt>(Move->second)->getSingleDecl()); | |||
526 | RefExpr = | |||
527 | BuildDeclRefExpr(MoveDecl, MoveDecl->getType().getNonReferenceType(), | |||
528 | ExprValueKind::VK_LValue, FD->getLocation()); | |||
529 | if (RefExpr.isInvalid()) | |||
530 | return nullptr; | |||
531 | CtorArgExprs.push_back(RefExpr.get()); | |||
532 | } | |||
533 | ||||
534 | // Create an initialization sequence for the promise type using the | |||
535 | // constructor arguments, wrapped in a parenthesized list expression. | |||
536 | Expr *PLE = new (Context) ParenListExpr(Context, FD->getLocation(), | |||
537 | CtorArgExprs, FD->getLocation()); | |||
538 | InitializedEntity Entity = InitializedEntity::InitializeVariable(VD); | |||
539 | InitializationKind Kind = InitializationKind::CreateForInit( | |||
540 | VD->getLocation(), /*DirectInit=*/true, PLE); | |||
541 | InitializationSequence InitSeq(*this, Entity, Kind, CtorArgExprs, | |||
542 | /*TopLevelOfInitList=*/false, | |||
543 | /*TreatUnavailableAsInvalid=*/false); | |||
544 | ||||
545 | // Attempt to initialize the promise type with the arguments. | |||
546 | // If that fails, fall back to the promise type's default constructor. | |||
547 | if (InitSeq) { | |||
548 | ExprResult Result = InitSeq.Perform(*this, Entity, Kind, CtorArgExprs); | |||
549 | if (Result.isInvalid()) { | |||
550 | VD->setInvalidDecl(); | |||
551 | } else if (Result.get()) { | |||
552 | VD->setInit(MaybeCreateExprWithCleanups(Result.get())); | |||
553 | VD->setInitStyle(VarDecl::CallInit); | |||
554 | CheckCompleteVariableDeclaration(VD); | |||
555 | } | |||
556 | } else | |||
557 | ActOnUninitializedDecl(VD); | |||
558 | ||||
559 | FD->addDecl(VD); | |||
560 | return VD; | |||
561 | } | |||
562 | ||||
563 | /// Check that this is a context in which a coroutine suspension can appear. | |||
564 | static FunctionScopeInfo *checkCoroutineContext(Sema &S, SourceLocation Loc, | |||
565 | StringRef Keyword, | |||
566 | bool IsImplicit = false) { | |||
567 | if (!isValidCoroutineContext(S, Loc, Keyword)) | |||
568 | return nullptr; | |||
569 | ||||
570 | 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-7~svn329677/tools/clang/lib/Sema/SemaCoroutine.cpp" , 570, __extension__ __PRETTY_FUNCTION__)); | |||
571 | ||||
572 | auto *ScopeInfo = S.getCurFunction(); | |||
573 | 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-7~svn329677/tools/clang/lib/Sema/SemaCoroutine.cpp" , 573, __extension__ __PRETTY_FUNCTION__)); | |||
574 | ||||
575 | if (ScopeInfo->FirstCoroutineStmtLoc.isInvalid() && !IsImplicit) | |||
576 | ScopeInfo->setFirstCoroutineStmt(Loc, Keyword); | |||
577 | ||||
578 | if (ScopeInfo->CoroutinePromise) | |||
579 | return ScopeInfo; | |||
580 | ||||
581 | if (!S.buildCoroutineParameterMoves(Loc)) | |||
582 | return nullptr; | |||
583 | ||||
584 | ScopeInfo->CoroutinePromise = S.buildCoroutinePromise(Loc); | |||
585 | if (!ScopeInfo->CoroutinePromise) | |||
586 | return nullptr; | |||
587 | ||||
588 | return ScopeInfo; | |||
589 | } | |||
590 | ||||
591 | bool Sema::ActOnCoroutineBodyStart(Scope *SC, SourceLocation KWLoc, | |||
592 | StringRef Keyword) { | |||
593 | if (!checkCoroutineContext(*this, KWLoc, Keyword)) | |||
594 | return false; | |||
595 | auto *ScopeInfo = getCurFunction(); | |||
596 | assert(ScopeInfo->CoroutinePromise)(static_cast <bool> (ScopeInfo->CoroutinePromise) ? void (0) : __assert_fail ("ScopeInfo->CoroutinePromise", "/build/llvm-toolchain-snapshot-7~svn329677/tools/clang/lib/Sema/SemaCoroutine.cpp" , 596, __extension__ __PRETTY_FUNCTION__)); | |||
597 | ||||
598 | // If we have existing coroutine statements then we have already built | |||
599 | // the initial and final suspend points. | |||
600 | if (!ScopeInfo->NeedsCoroutineSuspends) | |||
601 | return true; | |||
602 | ||||
603 | ScopeInfo->setNeedsCoroutineSuspends(false); | |||
604 | ||||
605 | auto *Fn = cast<FunctionDecl>(CurContext); | |||
606 | SourceLocation Loc = Fn->getLocation(); | |||
607 | // Build the initial suspend point | |||
608 | auto buildSuspends = [&](StringRef Name) mutable -> StmtResult { | |||
609 | ExprResult Suspend = | |||
610 | buildPromiseCall(*this, ScopeInfo->CoroutinePromise, Loc, Name, None); | |||
611 | if (Suspend.isInvalid()) | |||
612 | return StmtError(); | |||
613 | Suspend = buildOperatorCoawaitCall(*this, SC, Loc, Suspend.get()); | |||
614 | if (Suspend.isInvalid()) | |||
615 | return StmtError(); | |||
616 | Suspend = BuildResolvedCoawaitExpr(Loc, Suspend.get(), | |||
617 | /*IsImplicit*/ true); | |||
618 | Suspend = ActOnFinishFullExpr(Suspend.get()); | |||
619 | if (Suspend.isInvalid()) { | |||
620 | Diag(Loc, diag::note_coroutine_promise_suspend_implicitly_required) | |||
621 | << ((Name == "initial_suspend") ? 0 : 1); | |||
622 | Diag(KWLoc, diag::note_declared_coroutine_here) << Keyword; | |||
623 | return StmtError(); | |||
624 | } | |||
625 | return cast<Stmt>(Suspend.get()); | |||
626 | }; | |||
627 | ||||
628 | StmtResult InitSuspend = buildSuspends("initial_suspend"); | |||
629 | if (InitSuspend.isInvalid()) | |||
630 | return true; | |||
631 | ||||
632 | StmtResult FinalSuspend = buildSuspends("final_suspend"); | |||
633 | if (FinalSuspend.isInvalid()) | |||
634 | return true; | |||
635 | ||||
636 | ScopeInfo->setCoroutineSuspends(InitSuspend.get(), FinalSuspend.get()); | |||
637 | ||||
638 | return true; | |||
639 | } | |||
640 | ||||
641 | ExprResult Sema::ActOnCoawaitExpr(Scope *S, SourceLocation Loc, Expr *E) { | |||
642 | if (!ActOnCoroutineBodyStart(S, Loc, "co_await")) { | |||
643 | CorrectDelayedTyposInExpr(E); | |||
644 | return ExprError(); | |||
645 | } | |||
646 | ||||
647 | if (E->getType()->isPlaceholderType()) { | |||
648 | ExprResult R = CheckPlaceholderExpr(E); | |||
649 | if (R.isInvalid()) return ExprError(); | |||
650 | E = R.get(); | |||
651 | } | |||
652 | ExprResult Lookup = buildOperatorCoawaitLookupExpr(*this, S, Loc); | |||
653 | if (Lookup.isInvalid()) | |||
654 | return ExprError(); | |||
655 | return BuildUnresolvedCoawaitExpr(Loc, E, | |||
656 | cast<UnresolvedLookupExpr>(Lookup.get())); | |||
657 | } | |||
658 | ||||
659 | ExprResult Sema::BuildUnresolvedCoawaitExpr(SourceLocation Loc, Expr *E, | |||
660 | UnresolvedLookupExpr *Lookup) { | |||
661 | auto *FSI = checkCoroutineContext(*this, Loc, "co_await"); | |||
662 | if (!FSI) | |||
663 | return ExprError(); | |||
664 | ||||
665 | if (E->getType()->isPlaceholderType()) { | |||
666 | ExprResult R = CheckPlaceholderExpr(E); | |||
667 | if (R.isInvalid()) | |||
668 | return ExprError(); | |||
669 | E = R.get(); | |||
670 | } | |||
671 | ||||
672 | auto *Promise = FSI->CoroutinePromise; | |||
673 | if (Promise->getType()->isDependentType()) { | |||
674 | Expr *Res = | |||
675 | new (Context) DependentCoawaitExpr(Loc, Context.DependentTy, E, Lookup); | |||
676 | return Res; | |||
677 | } | |||
678 | ||||
679 | auto *RD = Promise->getType()->getAsCXXRecordDecl(); | |||
680 | if (lookupMember(*this, "await_transform", RD, Loc)) { | |||
681 | ExprResult R = buildPromiseCall(*this, Promise, Loc, "await_transform", E); | |||
682 | if (R.isInvalid()) { | |||
683 | Diag(Loc, | |||
684 | diag::note_coroutine_promise_implicit_await_transform_required_here) | |||
685 | << E->getSourceRange(); | |||
686 | return ExprError(); | |||
687 | } | |||
688 | E = R.get(); | |||
689 | } | |||
690 | ExprResult Awaitable = buildOperatorCoawaitCall(*this, Loc, E, Lookup); | |||
691 | if (Awaitable.isInvalid()) | |||
692 | return ExprError(); | |||
693 | ||||
694 | return BuildResolvedCoawaitExpr(Loc, Awaitable.get()); | |||
695 | } | |||
696 | ||||
697 | ExprResult Sema::BuildResolvedCoawaitExpr(SourceLocation Loc, Expr *E, | |||
698 | bool IsImplicit) { | |||
699 | auto *Coroutine = checkCoroutineContext(*this, Loc, "co_await", IsImplicit); | |||
700 | if (!Coroutine) | |||
701 | return ExprError(); | |||
702 | ||||
703 | if (E->getType()->isPlaceholderType()) { | |||
704 | ExprResult R = CheckPlaceholderExpr(E); | |||
705 | if (R.isInvalid()) return ExprError(); | |||
706 | E = R.get(); | |||
707 | } | |||
708 | ||||
709 | if (E->getType()->isDependentType()) { | |||
710 | Expr *Res = new (Context) | |||
711 | CoawaitExpr(Loc, Context.DependentTy, E, IsImplicit); | |||
712 | return Res; | |||
713 | } | |||
714 | ||||
715 | // If the expression is a temporary, materialize it as an lvalue so that we | |||
716 | // can use it multiple times. | |||
717 | if (E->getValueKind() == VK_RValue) | |||
718 | E = CreateMaterializeTemporaryExpr(E->getType(), E, true); | |||
719 | ||||
720 | // The location of the `co_await` token cannot be used when constructing | |||
721 | // the member call expressions since it's before the location of `Expr`, which | |||
722 | // is used as the start of the member call expression. | |||
723 | SourceLocation CallLoc = E->getExprLoc(); | |||
724 | ||||
725 | // Build the await_ready, await_suspend, await_resume calls. | |||
726 | ReadySuspendResumeResult RSS = | |||
727 | buildCoawaitCalls(*this, Coroutine->CoroutinePromise, CallLoc, E); | |||
728 | if (RSS.IsInvalid) | |||
729 | return ExprError(); | |||
730 | ||||
731 | Expr *Res = | |||
732 | new (Context) CoawaitExpr(Loc, E, RSS.Results[0], RSS.Results[1], | |||
733 | RSS.Results[2], RSS.OpaqueValue, IsImplicit); | |||
734 | ||||
735 | return Res; | |||
736 | } | |||
737 | ||||
738 | ExprResult Sema::ActOnCoyieldExpr(Scope *S, SourceLocation Loc, Expr *E) { | |||
739 | if (!ActOnCoroutineBodyStart(S, Loc, "co_yield")) { | |||
740 | CorrectDelayedTyposInExpr(E); | |||
741 | return ExprError(); | |||
742 | } | |||
743 | ||||
744 | // Build yield_value call. | |||
745 | ExprResult Awaitable = buildPromiseCall( | |||
746 | *this, getCurFunction()->CoroutinePromise, Loc, "yield_value", E); | |||
747 | if (Awaitable.isInvalid()) | |||
748 | return ExprError(); | |||
749 | ||||
750 | // Build 'operator co_await' call. | |||
751 | Awaitable = buildOperatorCoawaitCall(*this, S, Loc, Awaitable.get()); | |||
752 | if (Awaitable.isInvalid()) | |||
753 | return ExprError(); | |||
754 | ||||
755 | return BuildCoyieldExpr(Loc, Awaitable.get()); | |||
756 | } | |||
757 | ExprResult Sema::BuildCoyieldExpr(SourceLocation Loc, Expr *E) { | |||
758 | auto *Coroutine = checkCoroutineContext(*this, Loc, "co_yield"); | |||
759 | if (!Coroutine) | |||
760 | return ExprError(); | |||
761 | ||||
762 | if (E->getType()->isPlaceholderType()) { | |||
763 | ExprResult R = CheckPlaceholderExpr(E); | |||
764 | if (R.isInvalid()) return ExprError(); | |||
765 | E = R.get(); | |||
766 | } | |||
767 | ||||
768 | if (E->getType()->isDependentType()) { | |||
769 | Expr *Res = new (Context) CoyieldExpr(Loc, Context.DependentTy, E); | |||
770 | return Res; | |||
771 | } | |||
772 | ||||
773 | // If the expression is a temporary, materialize it as an lvalue so that we | |||
774 | // can use it multiple times. | |||
775 | if (E->getValueKind() == VK_RValue) | |||
776 | E = CreateMaterializeTemporaryExpr(E->getType(), E, true); | |||
777 | ||||
778 | // Build the await_ready, await_suspend, await_resume calls. | |||
779 | ReadySuspendResumeResult RSS = | |||
780 | buildCoawaitCalls(*this, Coroutine->CoroutinePromise, Loc, E); | |||
781 | if (RSS.IsInvalid) | |||
782 | return ExprError(); | |||
783 | ||||
784 | Expr *Res = | |||
785 | new (Context) CoyieldExpr(Loc, E, RSS.Results[0], RSS.Results[1], | |||
786 | RSS.Results[2], RSS.OpaqueValue); | |||
787 | ||||
788 | return Res; | |||
789 | } | |||
790 | ||||
791 | StmtResult Sema::ActOnCoreturnStmt(Scope *S, SourceLocation Loc, Expr *E) { | |||
792 | if (!ActOnCoroutineBodyStart(S, Loc, "co_return")) { | |||
793 | CorrectDelayedTyposInExpr(E); | |||
794 | return StmtError(); | |||
795 | } | |||
796 | return BuildCoreturnStmt(Loc, E); | |||
797 | } | |||
798 | ||||
799 | StmtResult Sema::BuildCoreturnStmt(SourceLocation Loc, Expr *E, | |||
800 | bool IsImplicit) { | |||
801 | auto *FSI = checkCoroutineContext(*this, Loc, "co_return", IsImplicit); | |||
802 | if (!FSI) | |||
803 | return StmtError(); | |||
804 | ||||
805 | if (E && E->getType()->isPlaceholderType() && | |||
806 | !E->getType()->isSpecificPlaceholderType(BuiltinType::Overload)) { | |||
807 | ExprResult R = CheckPlaceholderExpr(E); | |||
808 | if (R.isInvalid()) return StmtError(); | |||
809 | E = R.get(); | |||
810 | } | |||
811 | ||||
812 | // FIXME: If the operand is a reference to a variable that's about to go out | |||
813 | // of scope, we should treat the operand as an xvalue for this overload | |||
814 | // resolution. | |||
815 | VarDecl *Promise = FSI->CoroutinePromise; | |||
816 | ExprResult PC; | |||
817 | if (E && (isa<InitListExpr>(E) || !E->getType()->isVoidType())) { | |||
818 | PC = buildPromiseCall(*this, Promise, Loc, "return_value", E); | |||
819 | } else { | |||
820 | E = MakeFullDiscardedValueExpr(E).get(); | |||
821 | PC = buildPromiseCall(*this, Promise, Loc, "return_void", None); | |||
822 | } | |||
823 | if (PC.isInvalid()) | |||
824 | return StmtError(); | |||
825 | ||||
826 | Expr *PCE = ActOnFinishFullExpr(PC.get()).get(); | |||
827 | ||||
828 | Stmt *Res = new (Context) CoreturnStmt(Loc, E, PCE, IsImplicit); | |||
829 | return Res; | |||
830 | } | |||
831 | ||||
832 | /// Look up the std::nothrow object. | |||
833 | static Expr *buildStdNoThrowDeclRef(Sema &S, SourceLocation Loc) { | |||
834 | NamespaceDecl *Std = S.getStdNamespace(); | |||
835 | 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-7~svn329677/tools/clang/lib/Sema/SemaCoroutine.cpp" , 835, __extension__ __PRETTY_FUNCTION__)); | |||
836 | ||||
837 | LookupResult Result(S, &S.PP.getIdentifierTable().get("nothrow"), Loc, | |||
838 | Sema::LookupOrdinaryName); | |||
839 | if (!S.LookupQualifiedName(Result, Std)) { | |||
840 | // FIXME: <experimental/coroutine> should have been included already. | |||
841 | // If we require it to include <new> then this diagnostic is no longer | |||
842 | // needed. | |||
843 | S.Diag(Loc, diag::err_implicit_coroutine_std_nothrow_type_not_found); | |||
844 | return nullptr; | |||
845 | } | |||
846 | ||||
847 | auto *VD = Result.getAsSingle<VarDecl>(); | |||
848 | if (!VD) { | |||
849 | Result.suppressDiagnostics(); | |||
850 | // We found something weird. Complain about the first thing we found. | |||
851 | NamedDecl *Found = *Result.begin(); | |||
852 | S.Diag(Found->getLocation(), diag::err_malformed_std_nothrow); | |||
853 | return nullptr; | |||
854 | } | |||
855 | ||||
856 | ExprResult DR = S.BuildDeclRefExpr(VD, VD->getType(), VK_LValue, Loc); | |||
857 | if (DR.isInvalid()) | |||
858 | return nullptr; | |||
859 | ||||
860 | return DR.get(); | |||
861 | } | |||
862 | ||||
863 | // Find an appropriate delete for the promise. | |||
864 | static FunctionDecl *findDeleteForPromise(Sema &S, SourceLocation Loc, | |||
865 | QualType PromiseType) { | |||
866 | FunctionDecl *OperatorDelete = nullptr; | |||
867 | ||||
868 | DeclarationName DeleteName = | |||
869 | S.Context.DeclarationNames.getCXXOperatorName(OO_Delete); | |||
870 | ||||
871 | auto *PointeeRD = PromiseType->getAsCXXRecordDecl(); | |||
872 | 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-7~svn329677/tools/clang/lib/Sema/SemaCoroutine.cpp" , 872, __extension__ __PRETTY_FUNCTION__)); | |||
873 | ||||
874 | if (S.FindDeallocationFunction(Loc, PointeeRD, DeleteName, OperatorDelete)) | |||
875 | return nullptr; | |||
876 | ||||
877 | if (!OperatorDelete) { | |||
878 | // Look for a global declaration. | |||
879 | const bool CanProvideSize = S.isCompleteType(Loc, PromiseType); | |||
880 | const bool Overaligned = false; | |||
881 | OperatorDelete = S.FindUsualDeallocationFunction(Loc, CanProvideSize, | |||
882 | Overaligned, DeleteName); | |||
883 | } | |||
884 | S.MarkFunctionReferenced(Loc, OperatorDelete); | |||
885 | return OperatorDelete; | |||
886 | } | |||
887 | ||||
888 | ||||
889 | void Sema::CheckCompletedCoroutineBody(FunctionDecl *FD, Stmt *&Body) { | |||
890 | FunctionScopeInfo *Fn = getCurFunction(); | |||
891 | 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-7~svn329677/tools/clang/lib/Sema/SemaCoroutine.cpp" , 891, __extension__ __PRETTY_FUNCTION__)); | |||
892 | if (!Body) { | |||
| ||||
893 | 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-7~svn329677/tools/clang/lib/Sema/SemaCoroutine.cpp" , 894, __extension__ __PRETTY_FUNCTION__)) | |||
894 | "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-7~svn329677/tools/clang/lib/Sema/SemaCoroutine.cpp" , 894, __extension__ __PRETTY_FUNCTION__)); | |||
895 | return; | |||
896 | } | |||
897 | // We have a function that uses coroutine keywords, but we failed to build | |||
898 | // the promise type. | |||
899 | if (!Fn->CoroutinePromise) | |||
900 | return FD->setInvalidDecl(); | |||
901 | ||||
902 | if (isa<CoroutineBodyStmt>(Body)) { | |||
903 | // Nothing todo. the body is already a transformed coroutine body statement. | |||
904 | return; | |||
905 | } | |||
906 | ||||
907 | // Coroutines [stmt.return]p1: | |||
908 | // A return statement shall not appear in a coroutine. | |||
909 | if (Fn->FirstReturnLoc.isValid()) { | |||
910 | 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-7~svn329677/tools/clang/lib/Sema/SemaCoroutine.cpp" , 911, __extension__ __PRETTY_FUNCTION__)) | |||
911 | "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-7~svn329677/tools/clang/lib/Sema/SemaCoroutine.cpp" , 911, __extension__ __PRETTY_FUNCTION__)); | |||
912 | Diag(Fn->FirstReturnLoc, diag::err_return_in_coroutine); | |||
913 | Diag(Fn->FirstCoroutineStmtLoc, diag::note_declared_coroutine_here) | |||
914 | << Fn->getFirstCoroutineStmtKeyword(); | |||
915 | } | |||
916 | CoroutineStmtBuilder Builder(*this, *FD, *Fn, Body); | |||
917 | if (Builder.isInvalid() || !Builder.buildStatements()) | |||
918 | return FD->setInvalidDecl(); | |||
919 | ||||
920 | // Build body for the coroutine wrapper statement. | |||
921 | Body = CoroutineBodyStmt::Create(Context, Builder); | |||
922 | } | |||
923 | ||||
924 | CoroutineStmtBuilder::CoroutineStmtBuilder(Sema &S, FunctionDecl &FD, | |||
925 | sema::FunctionScopeInfo &Fn, | |||
926 | Stmt *Body) | |||
927 | : S(S), FD(FD), Fn(Fn), Loc(FD.getLocation()), | |||
928 | IsPromiseDependentType( | |||
929 | !Fn.CoroutinePromise || | |||
930 | Fn.CoroutinePromise->getType()->isDependentType()) { | |||
931 | this->Body = Body; | |||
932 | ||||
933 | for (auto KV : Fn.CoroutineParameterMoves) | |||
934 | this->ParamMovesVector.push_back(KV.second); | |||
935 | this->ParamMoves = this->ParamMovesVector; | |||
936 | ||||
937 | if (!IsPromiseDependentType) { | |||
938 | PromiseRecordDecl = Fn.CoroutinePromise->getType()->getAsCXXRecordDecl(); | |||
939 | 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-7~svn329677/tools/clang/lib/Sema/SemaCoroutine.cpp" , 939, __extension__ __PRETTY_FUNCTION__)); | |||
940 | } | |||
941 | this->IsValid = makePromiseStmt() && makeInitialAndFinalSuspend(); | |||
942 | } | |||
943 | ||||
944 | bool CoroutineStmtBuilder::buildStatements() { | |||
945 | 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-7~svn329677/tools/clang/lib/Sema/SemaCoroutine.cpp" , 945, __extension__ __PRETTY_FUNCTION__)); | |||
946 | this->IsValid = makeReturnObject(); | |||
947 | if (this->IsValid && !IsPromiseDependentType) | |||
948 | buildDependentStatements(); | |||
949 | return this->IsValid; | |||
950 | } | |||
951 | ||||
952 | bool CoroutineStmtBuilder::buildDependentStatements() { | |||
953 | 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-7~svn329677/tools/clang/lib/Sema/SemaCoroutine.cpp" , 953, __extension__ __PRETTY_FUNCTION__)); | |||
954 | 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-7~svn329677/tools/clang/lib/Sema/SemaCoroutine.cpp" , 955, __extension__ __PRETTY_FUNCTION__)) | |||
955 | "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-7~svn329677/tools/clang/lib/Sema/SemaCoroutine.cpp" , 955, __extension__ __PRETTY_FUNCTION__)); | |||
956 | this->IsValid = makeOnException() && makeOnFallthrough() && | |||
957 | makeGroDeclAndReturnStmt() && makeReturnOnAllocFailure() && | |||
958 | makeNewAndDeleteExpr(); | |||
959 | return this->IsValid; | |||
960 | } | |||
961 | ||||
962 | bool CoroutineStmtBuilder::makePromiseStmt() { | |||
963 | // Form a declaration statement for the promise declaration, so that AST | |||
964 | // visitors can more easily find it. | |||
965 | StmtResult PromiseStmt = | |||
966 | S.ActOnDeclStmt(S.ConvertDeclToDeclGroup(Fn.CoroutinePromise), Loc, Loc); | |||
967 | if (PromiseStmt.isInvalid()) | |||
968 | return false; | |||
969 | ||||
970 | this->Promise = PromiseStmt.get(); | |||
971 | return true; | |||
972 | } | |||
973 | ||||
974 | bool CoroutineStmtBuilder::makeInitialAndFinalSuspend() { | |||
975 | if (Fn.hasInvalidCoroutineSuspends()) | |||
976 | return false; | |||
977 | this->InitialSuspend = cast<Expr>(Fn.CoroutineSuspends.first); | |||
978 | this->FinalSuspend = cast<Expr>(Fn.CoroutineSuspends.second); | |||
979 | return true; | |||
980 | } | |||
981 | ||||
982 | static bool diagReturnOnAllocFailure(Sema &S, Expr *E, | |||
983 | CXXRecordDecl *PromiseRecordDecl, | |||
984 | FunctionScopeInfo &Fn) { | |||
985 | auto Loc = E->getExprLoc(); | |||
986 | if (auto *DeclRef = dyn_cast_or_null<DeclRefExpr>(E)) { | |||
987 | auto *Decl = DeclRef->getDecl(); | |||
988 | if (CXXMethodDecl *Method = dyn_cast_or_null<CXXMethodDecl>(Decl)) { | |||
989 | if (Method->isStatic()) | |||
990 | return true; | |||
991 | else | |||
992 | Loc = Decl->getLocation(); | |||
993 | } | |||
994 | } | |||
995 | ||||
996 | S.Diag( | |||
997 | Loc, | |||
998 | diag::err_coroutine_promise_get_return_object_on_allocation_failure) | |||
999 | << PromiseRecordDecl; | |||
1000 | S.Diag(Fn.FirstCoroutineStmtLoc, diag::note_declared_coroutine_here) | |||
1001 | << Fn.getFirstCoroutineStmtKeyword(); | |||
1002 | return false; | |||
1003 | } | |||
1004 | ||||
1005 | bool CoroutineStmtBuilder::makeReturnOnAllocFailure() { | |||
1006 | 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-7~svn329677/tools/clang/lib/Sema/SemaCoroutine.cpp" , 1007, __extension__ __PRETTY_FUNCTION__)) | |||
1007 | "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-7~svn329677/tools/clang/lib/Sema/SemaCoroutine.cpp" , 1007, __extension__ __PRETTY_FUNCTION__)); | |||
1008 | ||||
1009 | // [dcl.fct.def.coroutine]/8 | |||
1010 | // The unqualified-id get_return_object_on_allocation_failure is looked up in | |||
1011 | // the scope of class P by class member access lookup (3.4.5). ... | |||
1012 | // If an allocation function returns nullptr, ... the coroutine return value | |||
1013 | // is obtained by a call to ... get_return_object_on_allocation_failure(). | |||
1014 | ||||
1015 | DeclarationName DN = | |||
1016 | S.PP.getIdentifierInfo("get_return_object_on_allocation_failure"); | |||
1017 | LookupResult Found(S, DN, Loc, Sema::LookupMemberName); | |||
1018 | if (!S.LookupQualifiedName(Found, PromiseRecordDecl)) | |||
1019 | return true; | |||
1020 | ||||
1021 | CXXScopeSpec SS; | |||
1022 | ExprResult DeclNameExpr = | |||
1023 | S.BuildDeclarationNameExpr(SS, Found, /*NeedsADL=*/false); | |||
1024 | if (DeclNameExpr.isInvalid()) | |||
1025 | return false; | |||
1026 | ||||
1027 | if (!diagReturnOnAllocFailure(S, DeclNameExpr.get(), PromiseRecordDecl, Fn)) | |||
1028 | return false; | |||
1029 | ||||
1030 | ExprResult ReturnObjectOnAllocationFailure = | |||
1031 | S.ActOnCallExpr(nullptr, DeclNameExpr.get(), Loc, {}, Loc); | |||
1032 | if (ReturnObjectOnAllocationFailure.isInvalid()) | |||
1033 | return false; | |||
1034 | ||||
1035 | StmtResult ReturnStmt = | |||
1036 | S.BuildReturnStmt(Loc, ReturnObjectOnAllocationFailure.get()); | |||
1037 | if (ReturnStmt.isInvalid()) { | |||
1038 | S.Diag(Found.getFoundDecl()->getLocation(), diag::note_member_declared_here) | |||
1039 | << DN; | |||
1040 | S.Diag(Fn.FirstCoroutineStmtLoc, diag::note_declared_coroutine_here) | |||
1041 | << Fn.getFirstCoroutineStmtKeyword(); | |||
1042 | return false; | |||
1043 | } | |||
1044 | ||||
1045 | this->ReturnStmtOnAllocFailure = ReturnStmt.get(); | |||
1046 | return true; | |||
1047 | } | |||
1048 | ||||
1049 | bool CoroutineStmtBuilder::makeNewAndDeleteExpr() { | |||
1050 | // Form and check allocation and deallocation calls. | |||
1051 | 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-7~svn329677/tools/clang/lib/Sema/SemaCoroutine.cpp" , 1052, __extension__ __PRETTY_FUNCTION__)) | |||
1052 | "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-7~svn329677/tools/clang/lib/Sema/SemaCoroutine.cpp" , 1052, __extension__ __PRETTY_FUNCTION__)); | |||
1053 | QualType PromiseType = Fn.CoroutinePromise->getType(); | |||
1054 | ||||
1055 | if (S.RequireCompleteType(Loc, PromiseType, diag::err_incomplete_type)) | |||
1056 | return false; | |||
1057 | ||||
1058 | const bool RequiresNoThrowAlloc = ReturnStmtOnAllocFailure != nullptr; | |||
1059 | ||||
1060 | // [dcl.fct.def.coroutine]/7 | |||
1061 | // Lookup allocation functions using a parameter list composed of the | |||
1062 | // requested size of the coroutine state being allocated, followed by | |||
1063 | // the coroutine function's arguments. If a matching allocation function | |||
1064 | // exists, use it. Otherwise, use an allocation function that just takes | |||
1065 | // the requested size. | |||
1066 | ||||
1067 | FunctionDecl *OperatorNew = nullptr; | |||
1068 | FunctionDecl *OperatorDelete = nullptr; | |||
1069 | FunctionDecl *UnusedResult = nullptr; | |||
1070 | bool PassAlignment = false; | |||
1071 | SmallVector<Expr *, 1> PlacementArgs; | |||
1072 | ||||
1073 | // [dcl.fct.def.coroutine]/7 | |||
1074 | // "The allocation function’s name is looked up in the scope of P. | |||
1075 | // [...] If the lookup finds an allocation function in the scope of P, | |||
1076 | // overload resolution is performed on a function call created by assembling | |||
1077 | // an argument list. The first argument is the amount of space requested, | |||
1078 | // and has type std::size_t. The lvalues p1 ... pn are the succeeding | |||
1079 | // arguments." | |||
1080 | // | |||
1081 | // ...where "p1 ... pn" are defined earlier as: | |||
1082 | // | |||
1083 | // [dcl.fct.def.coroutine]/3 | |||
1084 | // "For a coroutine f that is a non-static member function, let P1 denote the | |||
1085 | // type of the implicit object parameter (13.3.1) and P2 ... Pn be the types | |||
1086 | // of the function parameters; otherwise let P1 ... Pn be the types of the | |||
1087 | // function parameters. Let p1 ... pn be lvalues denoting those objects." | |||
1088 | if (auto *MD = dyn_cast<CXXMethodDecl>(&FD)) { | |||
1089 | if (MD->isInstance() && !isLambdaCallOperator(MD)) { | |||
1090 | ExprResult ThisExpr = S.ActOnCXXThis(Loc); | |||
1091 | if (ThisExpr.isInvalid()) | |||
1092 | return false; | |||
1093 | ThisExpr = S.CreateBuiltinUnaryOp(Loc, UO_Deref, ThisExpr.get()); | |||
1094 | if (ThisExpr.isInvalid()) | |||
1095 | return false; | |||
1096 | PlacementArgs.push_back(ThisExpr.get()); | |||
1097 | } | |||
1098 | } | |||
1099 | for (auto *PD : FD.parameters()) { | |||
1100 | if (PD->getType()->isDependentType()) | |||
1101 | continue; | |||
1102 | ||||
1103 | // Build a reference to the parameter. | |||
1104 | auto PDLoc = PD->getLocation(); | |||
1105 | ExprResult PDRefExpr = | |||
1106 | S.BuildDeclRefExpr(PD, PD->getOriginalType().getNonReferenceType(), | |||
1107 | ExprValueKind::VK_LValue, PDLoc); | |||
1108 | if (PDRefExpr.isInvalid()) | |||
1109 | return false; | |||
1110 | ||||
1111 | PlacementArgs.push_back(PDRefExpr.get()); | |||
1112 | } | |||
1113 | S.FindAllocationFunctions(Loc, SourceRange(), /*NewScope*/ Sema::AFS_Class, | |||
1114 | /*DeleteScope*/ Sema::AFS_Both, PromiseType, | |||
1115 | /*isArray*/ false, PassAlignment, PlacementArgs, | |||
1116 | OperatorNew, UnusedResult, /*Diagnose*/ false); | |||
1117 | ||||
1118 | // [dcl.fct.def.coroutine]/7 | |||
1119 | // "If no matching function is found, overload resolution is performed again | |||
1120 | // on a function call created by passing just the amount of space required as | |||
1121 | // an argument of type std::size_t." | |||
1122 | if (!OperatorNew && !PlacementArgs.empty()) { | |||
1123 | PlacementArgs.clear(); | |||
1124 | S.FindAllocationFunctions(Loc, SourceRange(), /*NewScope*/ Sema::AFS_Class, | |||
1125 | /*DeleteScope*/ Sema::AFS_Both, PromiseType, | |||
1126 | /*isArray*/ false, PassAlignment, PlacementArgs, | |||
1127 | OperatorNew, UnusedResult, /*Diagnose*/ false); | |||
1128 | } | |||
1129 | ||||
1130 | // [dcl.fct.def.coroutine]/7 | |||
1131 | // "The allocation function’s name is looked up in the scope of P. If this | |||
1132 | // lookup fails, the allocation function’s name is looked up in the global | |||
1133 | // scope." | |||
1134 | if (!OperatorNew) { | |||
1135 | S.FindAllocationFunctions(Loc, SourceRange(), /*NewScope*/ Sema::AFS_Global, | |||
1136 | /*DeleteScope*/ Sema::AFS_Both, PromiseType, | |||
1137 | /*isArray*/ false, PassAlignment, PlacementArgs, | |||
1138 | OperatorNew, UnusedResult); | |||
1139 | } | |||
1140 | ||||
1141 | bool IsGlobalOverload = | |||
1142 | OperatorNew && !isa<CXXRecordDecl>(OperatorNew->getDeclContext()); | |||
1143 | // If we didn't find a class-local new declaration and non-throwing new | |||
1144 | // was is required then we need to lookup the non-throwing global operator | |||
1145 | // instead. | |||
1146 | if (RequiresNoThrowAlloc && (!OperatorNew || IsGlobalOverload)) { | |||
1147 | auto *StdNoThrow = buildStdNoThrowDeclRef(S, Loc); | |||
1148 | if (!StdNoThrow) | |||
1149 | return false; | |||
1150 | PlacementArgs = {StdNoThrow}; | |||
1151 | OperatorNew = nullptr; | |||
1152 | S.FindAllocationFunctions(Loc, SourceRange(), /*NewScope*/ Sema::AFS_Both, | |||
1153 | /*DeleteScope*/ Sema::AFS_Both, PromiseType, | |||
1154 | /*isArray*/ false, PassAlignment, PlacementArgs, | |||
1155 | OperatorNew, UnusedResult); | |||
1156 | } | |||
1157 | ||||
1158 | if (!OperatorNew) | |||
1159 | return false; | |||
1160 | ||||
1161 | if (RequiresNoThrowAlloc) { | |||
1162 | const auto *FT = OperatorNew->getType()->getAs<FunctionProtoType>(); | |||
1163 | if (!FT->isNothrow(S.Context, /*ResultIfDependent*/ false)) { | |||
1164 | S.Diag(OperatorNew->getLocation(), | |||
1165 | diag::err_coroutine_promise_new_requires_nothrow) | |||
1166 | << OperatorNew; | |||
1167 | S.Diag(Loc, diag::note_coroutine_promise_call_implicitly_required) | |||
1168 | << OperatorNew; | |||
1169 | return false; | |||
1170 | } | |||
1171 | } | |||
1172 | ||||
1173 | if ((OperatorDelete = findDeleteForPromise(S, Loc, PromiseType)) == nullptr) | |||
1174 | return false; | |||
1175 | ||||
1176 | Expr *FramePtr = | |||
1177 | buildBuiltinCall(S, Loc, Builtin::BI__builtin_coro_frame, {}); | |||
1178 | ||||
1179 | Expr *FrameSize = | |||
1180 | buildBuiltinCall(S, Loc, Builtin::BI__builtin_coro_size, {}); | |||
1181 | ||||
1182 | // Make new call. | |||
1183 | ||||
1184 | ExprResult NewRef = | |||
1185 | S.BuildDeclRefExpr(OperatorNew, OperatorNew->getType(), VK_LValue, Loc); | |||
1186 | if (NewRef.isInvalid()) | |||
1187 | return false; | |||
1188 | ||||
1189 | SmallVector<Expr *, 2> NewArgs(1, FrameSize); | |||
1190 | for (auto Arg : PlacementArgs) | |||
1191 | NewArgs.push_back(Arg); | |||
1192 | ||||
1193 | ExprResult NewExpr = | |||
1194 | S.ActOnCallExpr(S.getCurScope(), NewRef.get(), Loc, NewArgs, Loc); | |||
1195 | NewExpr = S.ActOnFinishFullExpr(NewExpr.get()); | |||
1196 | if (NewExpr.isInvalid()) | |||
1197 | return false; | |||
1198 | ||||
1199 | // Make delete call. | |||
1200 | ||||
1201 | QualType OpDeleteQualType = OperatorDelete->getType(); | |||
1202 | ||||
1203 | ExprResult DeleteRef = | |||
1204 | S.BuildDeclRefExpr(OperatorDelete, OpDeleteQualType, VK_LValue, Loc); | |||
1205 | if (DeleteRef.isInvalid()) | |||
1206 | return false; | |||
1207 | ||||
1208 | Expr *CoroFree = | |||
1209 | buildBuiltinCall(S, Loc, Builtin::BI__builtin_coro_free, {FramePtr}); | |||
1210 | ||||
1211 | SmallVector<Expr *, 2> DeleteArgs{CoroFree}; | |||
1212 | ||||
1213 | // Check if we need to pass the size. | |||
1214 | const auto *OpDeleteType = | |||
1215 | OpDeleteQualType.getTypePtr()->getAs<FunctionProtoType>(); | |||
1216 | if (OpDeleteType->getNumParams() > 1) | |||
1217 | DeleteArgs.push_back(FrameSize); | |||
1218 | ||||
1219 | ExprResult DeleteExpr = | |||
1220 | S.ActOnCallExpr(S.getCurScope(), DeleteRef.get(), Loc, DeleteArgs, Loc); | |||
1221 | DeleteExpr = S.ActOnFinishFullExpr(DeleteExpr.get()); | |||
1222 | if (DeleteExpr.isInvalid()) | |||
1223 | return false; | |||
1224 | ||||
1225 | this->Allocate = NewExpr.get(); | |||
1226 | this->Deallocate = DeleteExpr.get(); | |||
1227 | ||||
1228 | return true; | |||
1229 | } | |||
1230 | ||||
1231 | bool CoroutineStmtBuilder::makeOnFallthrough() { | |||
1232 | 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-7~svn329677/tools/clang/lib/Sema/SemaCoroutine.cpp" , 1233, __extension__ __PRETTY_FUNCTION__)) | |||
1233 | "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-7~svn329677/tools/clang/lib/Sema/SemaCoroutine.cpp" , 1233, __extension__ __PRETTY_FUNCTION__)); | |||
1234 | ||||
1235 | // [dcl.fct.def.coroutine]/4 | |||
1236 | // The unqualified-ids 'return_void' and 'return_value' are looked up in | |||
1237 | // the scope of class P. If both are found, the program is ill-formed. | |||
1238 | bool HasRVoid, HasRValue; | |||
1239 | LookupResult LRVoid = | |||
1240 | lookupMember(S, "return_void", PromiseRecordDecl, Loc, HasRVoid); | |||
1241 | LookupResult LRValue = | |||
1242 | lookupMember(S, "return_value", PromiseRecordDecl, Loc, HasRValue); | |||
1243 | ||||
1244 | StmtResult Fallthrough; | |||
1245 | if (HasRVoid && HasRValue) { | |||
1246 | // FIXME Improve this diagnostic | |||
1247 | S.Diag(FD.getLocation(), | |||
1248 | diag::err_coroutine_promise_incompatible_return_functions) | |||
1249 | << PromiseRecordDecl; | |||
1250 | S.Diag(LRVoid.getRepresentativeDecl()->getLocation(), | |||
1251 | diag::note_member_first_declared_here) | |||
1252 | << LRVoid.getLookupName(); | |||
1253 | S.Diag(LRValue.getRepresentativeDecl()->getLocation(), | |||
1254 | diag::note_member_first_declared_here) | |||
1255 | << LRValue.getLookupName(); | |||
1256 | return false; | |||
1257 | } else if (!HasRVoid && !HasRValue) { | |||
1258 | // FIXME: The PDTS currently specifies this case as UB, not ill-formed. | |||
1259 | // However we still diagnose this as an error since until the PDTS is fixed. | |||
1260 | S.Diag(FD.getLocation(), | |||
1261 | diag::err_coroutine_promise_requires_return_function) | |||
1262 | << PromiseRecordDecl; | |||
1263 | S.Diag(PromiseRecordDecl->getLocation(), diag::note_defined_here) | |||
1264 | << PromiseRecordDecl; | |||
1265 | return false; | |||
1266 | } else if (HasRVoid) { | |||
1267 | // If the unqualified-id return_void is found, flowing off the end of a | |||
1268 | // coroutine is equivalent to a co_return with no operand. Otherwise, | |||
1269 | // flowing off the end of a coroutine results in undefined behavior. | |||
1270 | Fallthrough = S.BuildCoreturnStmt(FD.getLocation(), nullptr, | |||
1271 | /*IsImplicit*/false); | |||
1272 | Fallthrough = S.ActOnFinishFullStmt(Fallthrough.get()); | |||
1273 | if (Fallthrough.isInvalid()) | |||
1274 | return false; | |||
1275 | } | |||
1276 | ||||
1277 | this->OnFallthrough = Fallthrough.get(); | |||
1278 | return true; | |||
1279 | } | |||
1280 | ||||
1281 | bool CoroutineStmtBuilder::makeOnException() { | |||
1282 | // Try to form 'p.unhandled_exception();' | |||
1283 | 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-7~svn329677/tools/clang/lib/Sema/SemaCoroutine.cpp" , 1284, __extension__ __PRETTY_FUNCTION__)) | |||
1284 | "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-7~svn329677/tools/clang/lib/Sema/SemaCoroutine.cpp" , 1284, __extension__ __PRETTY_FUNCTION__)); | |||
1285 | ||||
1286 | const bool RequireUnhandledException = S.getLangOpts().CXXExceptions; | |||
1287 | ||||
1288 | if (!lookupMember(S, "unhandled_exception", PromiseRecordDecl, Loc)) { | |||
1289 | auto DiagID = | |||
1290 | RequireUnhandledException | |||
1291 | ? diag::err_coroutine_promise_unhandled_exception_required | |||
1292 | : diag:: | |||
1293 | warn_coroutine_promise_unhandled_exception_required_with_exceptions; | |||
1294 | S.Diag(Loc, DiagID) << PromiseRecordDecl; | |||
1295 | S.Diag(PromiseRecordDecl->getLocation(), diag::note_defined_here) | |||
| ||||
1296 | << PromiseRecordDecl; | |||
1297 | return !RequireUnhandledException; | |||
1298 | } | |||
1299 | ||||
1300 | // If exceptions are disabled, don't try to build OnException. | |||
1301 | if (!S.getLangOpts().CXXExceptions) | |||
1302 | return true; | |||
1303 | ||||
1304 | ExprResult UnhandledException = buildPromiseCall(S, Fn.CoroutinePromise, Loc, | |||
1305 | "unhandled_exception", None); | |||
1306 | UnhandledException = S.ActOnFinishFullExpr(UnhandledException.get(), Loc); | |||
1307 | if (UnhandledException.isInvalid()) | |||
1308 | return false; | |||
1309 | ||||
1310 | // Since the body of the coroutine will be wrapped in try-catch, it will | |||
1311 | // be incompatible with SEH __try if present in a function. | |||
1312 | if (!S.getLangOpts().Borland && Fn.FirstSEHTryLoc.isValid()) { | |||
1313 | S.Diag(Fn.FirstSEHTryLoc, diag::err_seh_in_a_coroutine_with_cxx_exceptions); | |||
1314 | S.Diag(Fn.FirstCoroutineStmtLoc, diag::note_declared_coroutine_here) | |||
1315 | << Fn.getFirstCoroutineStmtKeyword(); | |||
1316 | return false; | |||
1317 | } | |||
1318 | ||||
1319 | this->OnException = UnhandledException.get(); | |||
1320 | return true; | |||
1321 | } | |||
1322 | ||||
1323 | bool CoroutineStmtBuilder::makeReturnObject() { | |||
1324 | // Build implicit 'p.get_return_object()' expression and form initialization | |||
1325 | // of return type from it. | |||
1326 | ExprResult ReturnObject = | |||
1327 | buildPromiseCall(S, Fn.CoroutinePromise, Loc, "get_return_object", None); | |||
1328 | if (ReturnObject.isInvalid()) | |||
1329 | return false; | |||
1330 | ||||
1331 | this->ReturnValue = ReturnObject.get(); | |||
1332 | return true; | |||
1333 | } | |||
1334 | ||||
1335 | static void noteMemberDeclaredHere(Sema &S, Expr *E, FunctionScopeInfo &Fn) { | |||
1336 | if (auto *MbrRef = dyn_cast<CXXMemberCallExpr>(E)) { | |||
1337 | auto *MethodDecl = MbrRef->getMethodDecl(); | |||
1338 | S.Diag(MethodDecl->getLocation(), diag::note_member_declared_here) | |||
1339 | << MethodDecl; | |||
1340 | } | |||
1341 | S.Diag(Fn.FirstCoroutineStmtLoc, diag::note_declared_coroutine_here) | |||
1342 | << Fn.getFirstCoroutineStmtKeyword(); | |||
1343 | } | |||
1344 | ||||
1345 | bool CoroutineStmtBuilder::makeGroDeclAndReturnStmt() { | |||
1346 | 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-7~svn329677/tools/clang/lib/Sema/SemaCoroutine.cpp" , 1347, __extension__ __PRETTY_FUNCTION__)) | |||
1347 | "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-7~svn329677/tools/clang/lib/Sema/SemaCoroutine.cpp" , 1347, __extension__ __PRETTY_FUNCTION__)); | |||
1348 | 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-7~svn329677/tools/clang/lib/Sema/SemaCoroutine.cpp" , 1348, __extension__ __PRETTY_FUNCTION__)); | |||
1349 | ||||
1350 | QualType const GroType = this->ReturnValue->getType(); | |||
1351 | 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-7~svn329677/tools/clang/lib/Sema/SemaCoroutine.cpp" , 1352, __extension__ __PRETTY_FUNCTION__)) | |||
1352 | "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-7~svn329677/tools/clang/lib/Sema/SemaCoroutine.cpp" , 1352, __extension__ __PRETTY_FUNCTION__)); | |||
1353 | ||||
1354 | QualType const FnRetType = FD.getReturnType(); | |||
1355 | 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-7~svn329677/tools/clang/lib/Sema/SemaCoroutine.cpp" , 1356, __extension__ __PRETTY_FUNCTION__)) | |||
1356 | "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-7~svn329677/tools/clang/lib/Sema/SemaCoroutine.cpp" , 1356, __extension__ __PRETTY_FUNCTION__)); | |||
1357 | ||||
1358 | if (FnRetType->isVoidType()) { | |||
1359 | ExprResult Res = S.ActOnFinishFullExpr(this->ReturnValue, Loc); | |||
1360 | if (Res.isInvalid()) | |||
1361 | return false; | |||
1362 | ||||
1363 | this->ResultDecl = Res.get(); | |||
1364 | return true; | |||
1365 | } | |||
1366 | ||||
1367 | if (GroType->isVoidType()) { | |||
1368 | // Trigger a nice error message. | |||
1369 | InitializedEntity Entity = | |||
1370 | InitializedEntity::InitializeResult(Loc, FnRetType, false); | |||
1371 | S.PerformMoveOrCopyInitialization(Entity, nullptr, FnRetType, ReturnValue); | |||
1372 | noteMemberDeclaredHere(S, ReturnValue, Fn); | |||
1373 | return false; | |||
1374 | } | |||
1375 | ||||
1376 | auto *GroDecl = VarDecl::Create( | |||
1377 | S.Context, &FD, FD.getLocation(), FD.getLocation(), | |||
1378 | &S.PP.getIdentifierTable().get("__coro_gro"), GroType, | |||
1379 | S.Context.getTrivialTypeSourceInfo(GroType, Loc), SC_None); | |||
1380 | ||||
1381 | S.CheckVariableDeclarationType(GroDecl); | |||
1382 | if (GroDecl->isInvalidDecl()) | |||
1383 | return false; | |||
1384 | ||||
1385 | InitializedEntity Entity = InitializedEntity::InitializeVariable(GroDecl); | |||
1386 | ExprResult Res = S.PerformMoveOrCopyInitialization(Entity, nullptr, GroType, | |||
1387 | this->ReturnValue); | |||
1388 | if (Res.isInvalid()) | |||
1389 | return false; | |||
1390 | ||||
1391 | Res = S.ActOnFinishFullExpr(Res.get()); | |||
1392 | if (Res.isInvalid()) | |||
1393 | return false; | |||
1394 | ||||
1395 | S.AddInitializerToDecl(GroDecl, Res.get(), | |||
1396 | /*DirectInit=*/false); | |||
1397 | ||||
1398 | S.FinalizeDeclaration(GroDecl); | |||
1399 | ||||
1400 | // Form a declaration statement for the return declaration, so that AST | |||
1401 | // visitors can more easily find it. | |||
1402 | StmtResult GroDeclStmt = | |||
1403 | S.ActOnDeclStmt(S.ConvertDeclToDeclGroup(GroDecl), Loc, Loc); | |||
1404 | if (GroDeclStmt.isInvalid()) | |||
1405 | return false; | |||
1406 | ||||
1407 | this->ResultDecl = GroDeclStmt.get(); | |||
1408 | ||||
1409 | ExprResult declRef = S.BuildDeclRefExpr(GroDecl, GroType, VK_LValue, Loc); | |||
1410 | if (declRef.isInvalid()) | |||
1411 | return false; | |||
1412 | ||||
1413 | StmtResult ReturnStmt = S.BuildReturnStmt(Loc, declRef.get()); | |||
1414 | if (ReturnStmt.isInvalid()) { | |||
1415 | noteMemberDeclaredHere(S, ReturnValue, Fn); | |||
1416 | return false; | |||
1417 | } | |||
1418 | if (cast<clang::ReturnStmt>(ReturnStmt.get())->getNRVOCandidate() == GroDecl) | |||
1419 | GroDecl->setNRVOVariable(true); | |||
1420 | ||||
1421 | this->ReturnStmt = ReturnStmt.get(); | |||
1422 | return true; | |||
1423 | } | |||
1424 | ||||
1425 | // Create a static_cast\<T&&>(expr). | |||
1426 | static Expr *castForMoving(Sema &S, Expr *E, QualType T = QualType()) { | |||
1427 | if (T.isNull()) | |||
1428 | T = E->getType(); | |||
1429 | QualType TargetType = S.BuildReferenceType( | |||
1430 | T, /*SpelledAsLValue*/ false, SourceLocation(), DeclarationName()); | |||
1431 | SourceLocation ExprLoc = E->getLocStart(); | |||
1432 | TypeSourceInfo *TargetLoc = | |||
1433 | S.Context.getTrivialTypeSourceInfo(TargetType, ExprLoc); | |||
1434 | ||||
1435 | return S | |||
1436 | .BuildCXXNamedCast(ExprLoc, tok::kw_static_cast, TargetLoc, E, | |||
1437 | SourceRange(ExprLoc, ExprLoc), E->getSourceRange()) | |||
1438 | .get(); | |||
1439 | } | |||
1440 | ||||
1441 | /// \brief Build a variable declaration for move parameter. | |||
1442 | static VarDecl *buildVarDecl(Sema &S, SourceLocation Loc, QualType Type, | |||
1443 | IdentifierInfo *II) { | |||
1444 | TypeSourceInfo *TInfo = S.Context.getTrivialTypeSourceInfo(Type, Loc); | |||
1445 | VarDecl *Decl = VarDecl::Create(S.Context, S.CurContext, Loc, Loc, II, Type, | |||
1446 | TInfo, SC_None); | |||
1447 | Decl->setImplicit(); | |||
1448 | return Decl; | |||
1449 | } | |||
1450 | ||||
1451 | // Build statements that move coroutine function parameters to the coroutine | |||
1452 | // frame, and store them on the function scope info. | |||
1453 | bool Sema::buildCoroutineParameterMoves(SourceLocation Loc) { | |||
1454 | 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-7~svn329677/tools/clang/lib/Sema/SemaCoroutine.cpp" , 1454, __extension__ __PRETTY_FUNCTION__)); | |||
1455 | auto *FD = cast<FunctionDecl>(CurContext); | |||
1456 | ||||
1457 | auto *ScopeInfo = getCurFunction(); | |||
1458 | assert(ScopeInfo->CoroutineParameterMoves.empty() &&(static_cast <bool> (ScopeInfo->CoroutineParameterMoves .empty() && "Should not build parameter moves twice") ? void (0) : __assert_fail ("ScopeInfo->CoroutineParameterMoves.empty() && \"Should not build parameter moves twice\"" , "/build/llvm-toolchain-snapshot-7~svn329677/tools/clang/lib/Sema/SemaCoroutine.cpp" , 1459, __extension__ __PRETTY_FUNCTION__)) | |||
1459 | "Should not build parameter moves twice")(static_cast <bool> (ScopeInfo->CoroutineParameterMoves .empty() && "Should not build parameter moves twice") ? void (0) : __assert_fail ("ScopeInfo->CoroutineParameterMoves.empty() && \"Should not build parameter moves twice\"" , "/build/llvm-toolchain-snapshot-7~svn329677/tools/clang/lib/Sema/SemaCoroutine.cpp" , 1459, __extension__ __PRETTY_FUNCTION__)); | |||
1460 | ||||
1461 | for (auto *PD : FD->parameters()) { | |||
1462 | if (PD->getType()->isDependentType()) | |||
1463 | continue; | |||
1464 | ||||
1465 | ExprResult PDRefExpr = | |||
1466 | BuildDeclRefExpr(PD, PD->getType().getNonReferenceType(), | |||
1467 | ExprValueKind::VK_LValue, Loc); // FIXME: scope? | |||
1468 | if (PDRefExpr.isInvalid()) | |||
1469 | return false; | |||
1470 | ||||
1471 | Expr *CExpr = nullptr; | |||
1472 | if (PD->getType()->getAsCXXRecordDecl() || | |||
1473 | PD->getType()->isRValueReferenceType()) | |||
1474 | CExpr = castForMoving(*this, PDRefExpr.get()); | |||
1475 | else | |||
1476 | CExpr = PDRefExpr.get(); | |||
1477 | ||||
1478 | auto D = buildVarDecl(*this, Loc, PD->getType(), PD->getIdentifier()); | |||
1479 | AddInitializerToDecl(D, CExpr, /*DirectInit=*/true); | |||
1480 | ||||
1481 | // Convert decl to a statement. | |||
1482 | StmtResult Stmt = ActOnDeclStmt(ConvertDeclToDeclGroup(D), Loc, Loc); | |||
1483 | if (Stmt.isInvalid()) | |||
1484 | return false; | |||
1485 | ||||
1486 | ScopeInfo->CoroutineParameterMoves.insert(std::make_pair(PD, Stmt.get())); | |||
1487 | } | |||
1488 | return true; | |||
1489 | } | |||
1490 | ||||
1491 | StmtResult Sema::BuildCoroutineBodyStmt(CoroutineBodyStmt::CtorArgs Args) { | |||
1492 | CoroutineBodyStmt *Res = CoroutineBodyStmt::Create(Context, Args); | |||
1493 | if (!Res) | |||
1494 | return StmtError(); | |||
1495 | return Res; | |||
1496 | } |
1 | //===- CoroutineStmtBuilder.h - Implicit coroutine stmt builder -*- C++ -*-===// |
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 | // This file defines CoroutineStmtBuilder, a class for building the implicit |
10 | // statements required for building a coroutine body. |
11 | // |
12 | //===----------------------------------------------------------------------===// |
13 | |
14 | #ifndef LLVM_CLANG_LIB_SEMA_COROUTINESTMTBUILDER_H |
15 | #define LLVM_CLANG_LIB_SEMA_COROUTINESTMTBUILDER_H |
16 | |
17 | #include "clang/AST/Decl.h" |
18 | #include "clang/AST/ExprCXX.h" |
19 | #include "clang/AST/StmtCXX.h" |
20 | #include "clang/Lex/Preprocessor.h" |
21 | #include "clang/Sema/SemaInternal.h" |
22 | |
23 | namespace clang { |
24 | |
25 | class CoroutineStmtBuilder : public CoroutineBodyStmt::CtorArgs { |
26 | Sema &S; |
27 | FunctionDecl &FD; |
28 | sema::FunctionScopeInfo &Fn; |
29 | bool IsValid = true; |
30 | SourceLocation Loc; |
31 | SmallVector<Stmt *, 4> ParamMovesVector; |
32 | const bool IsPromiseDependentType; |
33 | CXXRecordDecl *PromiseRecordDecl = nullptr; |
34 | |
35 | public: |
36 | /// \brief Construct a CoroutineStmtBuilder and initialize the promise |
37 | /// statement and initial/final suspends from the FunctionScopeInfo. |
38 | CoroutineStmtBuilder(Sema &S, FunctionDecl &FD, sema::FunctionScopeInfo &Fn, |
39 | Stmt *Body); |
40 | |
41 | /// \brief Build the coroutine body statements, including the |
42 | /// "promise dependent" statements when the promise type is not dependent. |
43 | bool buildStatements(); |
44 | |
45 | /// \brief Build the coroutine body statements that require a non-dependent |
46 | /// promise type in order to construct. |
47 | /// |
48 | /// For example different new/delete overloads are selected depending on |
49 | /// if the promise type provides `unhandled_exception()`, and therefore they |
50 | /// cannot be built until the promise type is complete so that we can perform |
51 | /// name lookup. |
52 | bool buildDependentStatements(); |
53 | |
54 | bool isInvalid() const { return !this->IsValid; } |
55 | |
56 | private: |
57 | bool makePromiseStmt(); |
58 | bool makeInitialAndFinalSuspend(); |
59 | bool makeNewAndDeleteExpr(); |
60 | bool makeOnFallthrough(); |
61 | bool makeOnException(); |
62 | bool makeReturnObject(); |
63 | bool makeGroDeclAndReturnStmt(); |
64 | bool makeReturnOnAllocFailure(); |
65 | }; |
66 | |
67 | } // end namespace clang |
68 | |
69 | #endif // LLVM_CLANG_LIB_SEMA_COROUTINESTMTBUILDER_H |