Bug Summary

File:tools/clang/lib/Sema/SemaCoroutine.cpp
Warning:line 1187, column 12
Called C++ object pointer is null

Annotated Source Code

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clang -cc1 -triple x86_64-pc-linux-gnu -analyze -disable-free -disable-llvm-verifier -discard-value-names -main-file-name SemaCoroutine.cpp -analyzer-store=region -analyzer-opt-analyze-nested-blocks -analyzer-eagerly-assume -analyzer-checker=core -analyzer-checker=apiModeling -analyzer-checker=unix -analyzer-checker=deadcode -analyzer-checker=cplusplus -analyzer-checker=security.insecureAPI.UncheckedReturn -analyzer-checker=security.insecureAPI.getpw -analyzer-checker=security.insecureAPI.gets -analyzer-checker=security.insecureAPI.mktemp -analyzer-checker=security.insecureAPI.mkstemp -analyzer-checker=security.insecureAPI.vfork -analyzer-checker=nullability.NullPassedToNonnull -analyzer-checker=nullability.NullReturnedFromNonnull -analyzer-output plist -w -mrelocation-model pic -pic-level 2 -mthread-model posix -relaxed-aliasing -fmath-errno -masm-verbose -mconstructor-aliases -munwind-tables -fuse-init-array -target-cpu x86-64 -dwarf-column-info -debugger-tuning=gdb -momit-leaf-frame-pointer -ffunction-sections -fdata-sections -resource-dir /usr/lib/llvm-7/lib/clang/7.0.0 -D _DEBUG -D _GNU_SOURCE -D __STDC_CONSTANT_MACROS -D __STDC_FORMAT_MACROS -D __STDC_LIMIT_MACROS -I /build/llvm-toolchain-snapshot-7~svn325118/build-llvm/tools/clang/lib/Sema -I /build/llvm-toolchain-snapshot-7~svn325118/tools/clang/lib/Sema -I /build/llvm-toolchain-snapshot-7~svn325118/tools/clang/include -I /build/llvm-toolchain-snapshot-7~svn325118/build-llvm/tools/clang/include -I /build/llvm-toolchain-snapshot-7~svn325118/build-llvm/include -I /build/llvm-toolchain-snapshot-7~svn325118/include -U NDEBUG -internal-isystem /usr/lib/gcc/x86_64-linux-gnu/7.3.0/../../../../include/c++/7.3.0 -internal-isystem /usr/lib/gcc/x86_64-linux-gnu/7.3.0/../../../../include/x86_64-linux-gnu/c++/7.3.0 -internal-isystem /usr/lib/gcc/x86_64-linux-gnu/7.3.0/../../../../include/x86_64-linux-gnu/c++/7.3.0 -internal-isystem /usr/lib/gcc/x86_64-linux-gnu/7.3.0/../../../../include/c++/7.3.0/backward -internal-isystem /usr/include/clang/7.0.0/include/ -internal-isystem /usr/local/include -internal-isystem /usr/lib/llvm-7/lib/clang/7.0.0/include -internal-externc-isystem /usr/include/x86_64-linux-gnu -internal-externc-isystem /include -internal-externc-isystem /usr/include -O2 -Wno-unused-parameter -Wwrite-strings -Wno-missing-field-initializers -Wno-long-long -Wno-maybe-uninitialized -Wno-comment -std=c++11 -fdeprecated-macro -fdebug-compilation-dir /build/llvm-toolchain-snapshot-7~svn325118/build-llvm/tools/clang/lib/Sema -ferror-limit 19 -fmessage-length 0 -fvisibility-inlines-hidden -fobjc-runtime=gcc -fno-common -fdiagnostics-show-option -vectorize-loops -vectorize-slp -analyzer-checker optin.performance.Padding -analyzer-output=html -analyzer-config stable-report-filename=true -o /tmp/scan-build-2018-02-14-150435-17243-1 -x c++ /build/llvm-toolchain-snapshot-7~svn325118/tools/clang/lib/Sema/SemaCoroutine.cpp

/build/llvm-toolchain-snapshot-7~svn325118/tools/clang/lib/Sema/SemaCoroutine.cpp

1//===--- SemaCoroutines.cpp - Semantic Analysis for Coroutines ------------===//
2//
3// The LLVM Compiler Infrastructure
4//
5// This file is distributed under the University of Illinois Open Source
6// License. See LICENSE.TXT for details.
7//
8//===----------------------------------------------------------------------===//
9//
10// This file implements semantic analysis for C++ Coroutines.
11//
12//===----------------------------------------------------------------------===//
13
14#include "CoroutineStmtBuilder.h"
15#include "clang/AST/Decl.h"
16#include "clang/AST/ExprCXX.h"
17#include "clang/AST/StmtCXX.h"
18#include "clang/Lex/Preprocessor.h"
19#include "clang/Sema/Initialization.h"
20#include "clang/Sema/Overload.h"
21#include "clang/Sema/SemaInternal.h"
22
23using namespace clang;
24using namespace sema;
25
26static LookupResult lookupMember(Sema &S, const char *Name, CXXRecordDecl *RD,
27 SourceLocation Loc, bool &Res) {
28 DeclarationName DN = S.PP.getIdentifierInfo(Name);
29 LookupResult LR(S, DN, Loc, Sema::LookupMemberName);
30 // Suppress diagnostics when a private member is selected. The same warnings
31 // will be produced again when building the call.
32 LR.suppressDiagnostics();
33 Res = S.LookupQualifiedName(LR, RD);
34 return LR;
35}
36
37static bool lookupMember(Sema &S, const char *Name, CXXRecordDecl *RD,
38 SourceLocation Loc) {
39 bool Res;
40 lookupMember(S, Name, RD, Loc, Res);
41 return Res;
42}
43
44/// Look up the std::coroutine_traits<...>::promise_type for the given
45/// function type.
46static QualType lookupPromiseType(Sema &S, const FunctionDecl *FD,
47 SourceLocation KwLoc) {
48 const FunctionProtoType *FnType = FD->getType()->castAs<FunctionProtoType>();
49 const SourceLocation FuncLoc = FD->getLocation();
50 // FIXME: Cache std::coroutine_traits once we've found it.
51 NamespaceDecl *StdExp = S.lookupStdExperimentalNamespace();
52 if (!StdExp) {
53 S.Diag(KwLoc, diag::err_implied_coroutine_type_not_found)
54 << "std::experimental::coroutine_traits";
55 return QualType();
56 }
57
58 LookupResult Result(S, &S.PP.getIdentifierTable().get("coroutine_traits"),
59 FuncLoc, Sema::LookupOrdinaryName);
60 if (!S.LookupQualifiedName(Result, StdExp)) {
61 S.Diag(KwLoc, diag::err_implied_coroutine_type_not_found)
62 << "std::experimental::coroutine_traits";
63 return QualType();
64 }
65
66 ClassTemplateDecl *CoroTraits = Result.getAsSingle<ClassTemplateDecl>();
67 if (!CoroTraits) {
68 Result.suppressDiagnostics();
69 // We found something weird. Complain about the first thing we found.
70 NamedDecl *Found = *Result.begin();
71 S.Diag(Found->getLocation(), diag::err_malformed_std_coroutine_traits);
72 return QualType();
73 }
74
75 // Form template argument list for coroutine_traits<R, P1, P2, ...> according
76 // to [dcl.fct.def.coroutine]3
77 TemplateArgumentListInfo Args(KwLoc, KwLoc);
78 auto AddArg = [&](QualType T) {
79 Args.addArgument(TemplateArgumentLoc(
80 TemplateArgument(T), S.Context.getTrivialTypeSourceInfo(T, KwLoc)));
81 };
82 AddArg(FnType->getReturnType());
83 // If the function is a non-static member function, add the type
84 // of the implicit object parameter before the formal parameters.
85 if (auto *MD = dyn_cast<CXXMethodDecl>(FD)) {
86 if (MD->isInstance()) {
87 // [over.match.funcs]4
88 // For non-static member functions, the type of the implicit object
89 // parameter is
90 // -- "lvalue reference to cv X" for functions declared without a
91 // ref-qualifier or with the & ref-qualifier
92 // -- "rvalue reference to cv X" for functions declared with the &&
93 // ref-qualifier
94 QualType T =
95 MD->getThisType(S.Context)->getAs<PointerType>()->getPointeeType();
96 T = FnType->getRefQualifier() == RQ_RValue
97 ? S.Context.getRValueReferenceType(T)
98 : S.Context.getLValueReferenceType(T, /*SpelledAsLValue*/ true);
99 AddArg(T);
100 }
101 }
102 for (QualType T : FnType->getParamTypes())
103 AddArg(T);
104
105 // Build the template-id.
106 QualType CoroTrait =
107 S.CheckTemplateIdType(TemplateName(CoroTraits), KwLoc, Args);
108 if (CoroTrait.isNull())
109 return QualType();
110 if (S.RequireCompleteType(KwLoc, CoroTrait,
111 diag::err_coroutine_type_missing_specialization))
112 return QualType();
113
114 auto *RD = CoroTrait->getAsCXXRecordDecl();
115 assert(RD && "specialization of class template is not a class?")(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~svn325118/tools/clang/lib/Sema/SemaCoroutine.cpp"
, 115, __extension__ __PRETTY_FUNCTION__))
;
116
117 // Look up the ::promise_type member.
118 LookupResult R(S, &S.PP.getIdentifierTable().get("promise_type"), KwLoc,
119 Sema::LookupOrdinaryName);
120 S.LookupQualifiedName(R, RD);
121 auto *Promise = R.getAsSingle<TypeDecl>();
122 if (!Promise) {
123 S.Diag(FuncLoc,
124 diag::err_implied_std_coroutine_traits_promise_type_not_found)
125 << RD;
126 return QualType();
127 }
128 // The promise type is required to be a class type.
129 QualType PromiseType = S.Context.getTypeDeclType(Promise);
130
131 auto buildElaboratedType = [&]() {
132 auto *NNS = NestedNameSpecifier::Create(S.Context, nullptr, StdExp);
133 NNS = NestedNameSpecifier::Create(S.Context, NNS, false,
134 CoroTrait.getTypePtr());
135 return S.Context.getElaboratedType(ETK_None, NNS, PromiseType);
136 };
137
138 if (!PromiseType->getAsCXXRecordDecl()) {
139 S.Diag(FuncLoc,
140 diag::err_implied_std_coroutine_traits_promise_type_not_class)
141 << buildElaboratedType();
142 return QualType();
143 }
144 if (S.RequireCompleteType(FuncLoc, buildElaboratedType(),
145 diag::err_coroutine_promise_type_incomplete))
146 return QualType();
147
148 return PromiseType;
149}
150
151/// Look up the std::experimental::coroutine_handle<PromiseType>.
152static QualType lookupCoroutineHandleType(Sema &S, QualType PromiseType,
153 SourceLocation Loc) {
154 if (PromiseType.isNull())
155 return QualType();
156
157 NamespaceDecl *StdExp = S.lookupStdExperimentalNamespace();
158 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~svn325118/tools/clang/lib/Sema/SemaCoroutine.cpp"
, 158, __extension__ __PRETTY_FUNCTION__))
;
159
160 LookupResult Result(S, &S.PP.getIdentifierTable().get("coroutine_handle"),
161 Loc, Sema::LookupOrdinaryName);
162 if (!S.LookupQualifiedName(Result, StdExp)) {
163 S.Diag(Loc, diag::err_implied_coroutine_type_not_found)
164 << "std::experimental::coroutine_handle";
165 return QualType();
166 }
167
168 ClassTemplateDecl *CoroHandle = Result.getAsSingle<ClassTemplateDecl>();
169 if (!CoroHandle) {
170 Result.suppressDiagnostics();
171 // We found something weird. Complain about the first thing we found.
172 NamedDecl *Found = *Result.begin();
173 S.Diag(Found->getLocation(), diag::err_malformed_std_coroutine_handle);
174 return QualType();
175 }
176
177 // Form template argument list for coroutine_handle<Promise>.
178 TemplateArgumentListInfo Args(Loc, Loc);
179 Args.addArgument(TemplateArgumentLoc(
180 TemplateArgument(PromiseType),
181 S.Context.getTrivialTypeSourceInfo(PromiseType, Loc)));
182
183 // Build the template-id.
184 QualType CoroHandleType =
185 S.CheckTemplateIdType(TemplateName(CoroHandle), Loc, Args);
186 if (CoroHandleType.isNull())
187 return QualType();
188 if (S.RequireCompleteType(Loc, CoroHandleType,
189 diag::err_coroutine_type_missing_specialization))
190 return QualType();
191
192 return CoroHandleType;
193}
194
195static bool isValidCoroutineContext(Sema &S, SourceLocation Loc,
196 StringRef Keyword) {
197 // 'co_await' and 'co_yield' are not permitted in unevaluated operands.
198 if (S.isUnevaluatedContext()) {
199 S.Diag(Loc, diag::err_coroutine_unevaluated_context) << Keyword;
200 return false;
201 }
202
203 // Any other usage must be within a function.
204 auto *FD = dyn_cast<FunctionDecl>(S.CurContext);
205 if (!FD) {
206 S.Diag(Loc, isa<ObjCMethodDecl>(S.CurContext)
207 ? diag::err_coroutine_objc_method
208 : diag::err_coroutine_outside_function) << Keyword;
209 return false;
210 }
211
212 // An enumeration for mapping the diagnostic type to the correct diagnostic
213 // selection index.
214 enum InvalidFuncDiag {
215 DiagCtor = 0,
216 DiagDtor,
217 DiagCopyAssign,
218 DiagMoveAssign,
219 DiagMain,
220 DiagConstexpr,
221 DiagAutoRet,
222 DiagVarargs,
223 };
224 bool Diagnosed = false;
225 auto DiagInvalid = [&](InvalidFuncDiag ID) {
226 S.Diag(Loc, diag::err_coroutine_invalid_func_context) << ID << Keyword;
227 Diagnosed = true;
228 return false;
229 };
230
231 // Diagnose when a constructor, destructor, copy/move assignment operator,
232 // or the function 'main' are declared as a coroutine.
233 auto *MD = dyn_cast<CXXMethodDecl>(FD);
234 if (MD && isa<CXXConstructorDecl>(MD))
235 return DiagInvalid(DiagCtor);
236 else if (MD && isa<CXXDestructorDecl>(MD))
237 return DiagInvalid(DiagDtor);
238 else if (MD && MD->isCopyAssignmentOperator())
239 return DiagInvalid(DiagCopyAssign);
240 else if (MD && MD->isMoveAssignmentOperator())
241 return DiagInvalid(DiagMoveAssign);
242 else if (FD->isMain())
243 return DiagInvalid(DiagMain);
244
245 // Emit a diagnostics for each of the following conditions which is not met.
246 if (FD->isConstexpr())
247 DiagInvalid(DiagConstexpr);
248 if (FD->getReturnType()->isUndeducedType())
249 DiagInvalid(DiagAutoRet);
250 if (FD->isVariadic())
251 DiagInvalid(DiagVarargs);
252
253 return !Diagnosed;
254}
255
256static ExprResult buildOperatorCoawaitLookupExpr(Sema &SemaRef, Scope *S,
257 SourceLocation Loc) {
258 DeclarationName OpName =
259 SemaRef.Context.DeclarationNames.getCXXOperatorName(OO_Coawait);
260 LookupResult Operators(SemaRef, OpName, SourceLocation(),
261 Sema::LookupOperatorName);
262 SemaRef.LookupName(Operators, S);
263
264 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~svn325118/tools/clang/lib/Sema/SemaCoroutine.cpp"
, 264, __extension__ __PRETTY_FUNCTION__))
;
265 const auto &Functions = Operators.asUnresolvedSet();
266 bool IsOverloaded =
267 Functions.size() > 1 ||
268 (Functions.size() == 1 && isa<FunctionTemplateDecl>(*Functions.begin()));
269 Expr *CoawaitOp = UnresolvedLookupExpr::Create(
270 SemaRef.Context, /*NamingClass*/ nullptr, NestedNameSpecifierLoc(),
271 DeclarationNameInfo(OpName, Loc), /*RequiresADL*/ true, IsOverloaded,
272 Functions.begin(), Functions.end());
273 assert(CoawaitOp)(static_cast <bool> (CoawaitOp) ? void (0) : __assert_fail
("CoawaitOp", "/build/llvm-toolchain-snapshot-7~svn325118/tools/clang/lib/Sema/SemaCoroutine.cpp"
, 273, __extension__ __PRETTY_FUNCTION__))
;
274 return CoawaitOp;
275}
276
277/// Build a call to 'operator co_await' if there is a suitable operator for
278/// the given expression.
279static ExprResult buildOperatorCoawaitCall(Sema &SemaRef, SourceLocation Loc,
280 Expr *E,
281 UnresolvedLookupExpr *Lookup) {
282 UnresolvedSet<16> Functions;
283 Functions.append(Lookup->decls_begin(), Lookup->decls_end());
284 return SemaRef.CreateOverloadedUnaryOp(Loc, UO_Coawait, Functions, E);
285}
286
287static ExprResult buildOperatorCoawaitCall(Sema &SemaRef, Scope *S,
288 SourceLocation Loc, Expr *E) {
289 ExprResult R = buildOperatorCoawaitLookupExpr(SemaRef, S, Loc);
290 if (R.isInvalid())
291 return ExprError();
292 return buildOperatorCoawaitCall(SemaRef, Loc, E,
293 cast<UnresolvedLookupExpr>(R.get()));
294}
295
296static Expr *buildBuiltinCall(Sema &S, SourceLocation Loc, Builtin::ID Id,
297 MultiExprArg CallArgs) {
298 StringRef Name = S.Context.BuiltinInfo.getName(Id);
299 LookupResult R(S, &S.Context.Idents.get(Name), Loc, Sema::LookupOrdinaryName);
300 S.LookupName(R, S.TUScope, /*AllowBuiltinCreation=*/true);
301
302 auto *BuiltInDecl = R.getAsSingle<FunctionDecl>();
303 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~svn325118/tools/clang/lib/Sema/SemaCoroutine.cpp"
, 303, __extension__ __PRETTY_FUNCTION__))
;
304
305 ExprResult DeclRef =
306 S.BuildDeclRefExpr(BuiltInDecl, BuiltInDecl->getType(), VK_LValue, Loc);
307 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~svn325118/tools/clang/lib/Sema/SemaCoroutine.cpp"
, 307, __extension__ __PRETTY_FUNCTION__))
;
308
309 ExprResult Call =
310 S.ActOnCallExpr(/*Scope=*/nullptr, DeclRef.get(), Loc, CallArgs, Loc);
311
312 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~svn325118/tools/clang/lib/Sema/SemaCoroutine.cpp"
, 312, __extension__ __PRETTY_FUNCTION__))
;
313 return Call.get();
314}
315
316static ExprResult buildCoroutineHandle(Sema &S, QualType PromiseType,
317 SourceLocation Loc) {
318 QualType CoroHandleType = lookupCoroutineHandleType(S, PromiseType, Loc);
319 if (CoroHandleType.isNull())
320 return ExprError();
321
322 DeclContext *LookupCtx = S.computeDeclContext(CoroHandleType);
323 LookupResult Found(S, &S.PP.getIdentifierTable().get("from_address"), Loc,
324 Sema::LookupOrdinaryName);
325 if (!S.LookupQualifiedName(Found, LookupCtx)) {
326 S.Diag(Loc, diag::err_coroutine_handle_missing_member)
327 << "from_address";
328 return ExprError();
329 }
330
331 Expr *FramePtr =
332 buildBuiltinCall(S, Loc, Builtin::BI__builtin_coro_frame, {});
333
334 CXXScopeSpec SS;
335 ExprResult FromAddr =
336 S.BuildDeclarationNameExpr(SS, Found, /*NeedsADL=*/false);
337 if (FromAddr.isInvalid())
338 return ExprError();
339
340 return S.ActOnCallExpr(nullptr, FromAddr.get(), Loc, FramePtr, Loc);
341}
342
343struct ReadySuspendResumeResult {
344 enum AwaitCallType { ACT_Ready, ACT_Suspend, ACT_Resume };
345 Expr *Results[3];
346 OpaqueValueExpr *OpaqueValue;
347 bool IsInvalid;
348};
349
350static ExprResult buildMemberCall(Sema &S, Expr *Base, SourceLocation Loc,
351 StringRef Name, MultiExprArg Args) {
352 DeclarationNameInfo NameInfo(&S.PP.getIdentifierTable().get(Name), Loc);
353
354 // FIXME: Fix BuildMemberReferenceExpr to take a const CXXScopeSpec&.
355 CXXScopeSpec SS;
356 ExprResult Result = S.BuildMemberReferenceExpr(
357 Base, Base->getType(), Loc, /*IsPtr=*/false, SS,
358 SourceLocation(), nullptr, NameInfo, /*TemplateArgs=*/nullptr,
359 /*Scope=*/nullptr);
360 if (Result.isInvalid())
361 return ExprError();
362
363 return S.ActOnCallExpr(nullptr, Result.get(), Loc, Args, Loc, nullptr);
364}
365
366// See if return type is coroutine-handle and if so, invoke builtin coro-resume
367// on its address. This is to enable experimental support for coroutine-handle
368// returning await_suspend that results in a guranteed tail call to the target
369// coroutine.
370static Expr *maybeTailCall(Sema &S, QualType RetType, Expr *E,
371 SourceLocation Loc) {
372 if (RetType->isReferenceType())
373 return nullptr;
374 Type const *T = RetType.getTypePtr();
375 if (!T->isClassType() && !T->isStructureType())
376 return nullptr;
377
378 // FIXME: Add convertability check to coroutine_handle<>. Possibly via
379 // EvaluateBinaryTypeTrait(BTT_IsConvertible, ...) which is at the moment
380 // a private function in SemaExprCXX.cpp
381
382 ExprResult AddressExpr = buildMemberCall(S, E, Loc, "address", None);
383 if (AddressExpr.isInvalid())
384 return nullptr;
385
386 Expr *JustAddress = AddressExpr.get();
387 // FIXME: Check that the type of AddressExpr is void*
388 return buildBuiltinCall(S, Loc, Builtin::BI__builtin_coro_resume,
389 JustAddress);
390}
391
392/// Build calls to await_ready, await_suspend, and await_resume for a co_await
393/// expression.
394static ReadySuspendResumeResult buildCoawaitCalls(Sema &S, VarDecl *CoroPromise,
395 SourceLocation Loc, Expr *E) {
396 OpaqueValueExpr *Operand = new (S.Context)
397 OpaqueValueExpr(Loc, E->getType(), VK_LValue, E->getObjectKind(), E);
398
399 // Assume invalid until we see otherwise.
400 ReadySuspendResumeResult Calls = {{}, Operand, /*IsInvalid=*/true};
401
402 ExprResult CoroHandleRes = buildCoroutineHandle(S, CoroPromise->getType(), Loc);
403 if (CoroHandleRes.isInvalid())
404 return Calls;
405 Expr *CoroHandle = CoroHandleRes.get();
406
407 const StringRef Funcs[] = {"await_ready", "await_suspend", "await_resume"};
408 MultiExprArg Args[] = {None, CoroHandle, None};
409 for (size_t I = 0, N = llvm::array_lengthof(Funcs); I != N; ++I) {
410 ExprResult Result = buildMemberCall(S, Operand, Loc, Funcs[I], Args[I]);
411 if (Result.isInvalid())
412 return Calls;
413 Calls.Results[I] = Result.get();
414 }
415
416 // Assume the calls are valid; all further checking should make them invalid.
417 Calls.IsInvalid = false;
418
419 using ACT = ReadySuspendResumeResult::AwaitCallType;
420 CallExpr *AwaitReady = cast<CallExpr>(Calls.Results[ACT::ACT_Ready]);
421 if (!AwaitReady->getType()->isDependentType()) {
422 // [expr.await]p3 [...]
423 // — await-ready is the expression e.await_ready(), contextually converted
424 // to bool.
425 ExprResult Conv = S.PerformContextuallyConvertToBool(AwaitReady);
426 if (Conv.isInvalid()) {
427 S.Diag(AwaitReady->getDirectCallee()->getLocStart(),
428 diag::note_await_ready_no_bool_conversion);
429 S.Diag(Loc, diag::note_coroutine_promise_call_implicitly_required)
430 << AwaitReady->getDirectCallee() << E->getSourceRange();
431 Calls.IsInvalid = true;
432 }
433 Calls.Results[ACT::ACT_Ready] = Conv.get();
434 }
435 CallExpr *AwaitSuspend = cast<CallExpr>(Calls.Results[ACT::ACT_Suspend]);
436 if (!AwaitSuspend->getType()->isDependentType()) {
437 // [expr.await]p3 [...]
438 // - await-suspend is the expression e.await_suspend(h), which shall be
439 // a prvalue of type void or bool.
440 QualType RetType = AwaitSuspend->getCallReturnType(S.Context);
441
442 // Experimental support for coroutine_handle returning await_suspend.
443 if (Expr *TailCallSuspend = maybeTailCall(S, RetType, AwaitSuspend, Loc))
444 Calls.Results[ACT::ACT_Suspend] = TailCallSuspend;
445 else {
446 // non-class prvalues always have cv-unqualified types
447 if (RetType->isReferenceType() ||
448 (!RetType->isBooleanType() && !RetType->isVoidType())) {
449 S.Diag(AwaitSuspend->getCalleeDecl()->getLocation(),
450 diag::err_await_suspend_invalid_return_type)
451 << RetType;
452 S.Diag(Loc, diag::note_coroutine_promise_call_implicitly_required)
453 << AwaitSuspend->getDirectCallee();
454 Calls.IsInvalid = true;
455 }
456 }
457 }
458
459 return Calls;
460}
461
462static ExprResult buildPromiseCall(Sema &S, VarDecl *Promise,
463 SourceLocation Loc, StringRef Name,
464 MultiExprArg Args) {
465
466 // Form a reference to the promise.
467 ExprResult PromiseRef = S.BuildDeclRefExpr(
468 Promise, Promise->getType().getNonReferenceType(), VK_LValue, Loc);
469 if (PromiseRef.isInvalid())
470 return ExprError();
471
472 return buildMemberCall(S, PromiseRef.get(), Loc, Name, Args);
473}
474
475VarDecl *Sema::buildCoroutinePromise(SourceLocation Loc) {
476 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~svn325118/tools/clang/lib/Sema/SemaCoroutine.cpp"
, 476, __extension__ __PRETTY_FUNCTION__))
;
477 auto *FD = cast<FunctionDecl>(CurContext);
478 bool IsThisDependentType = [&] {
479 if (auto *MD = dyn_cast_or_null<CXXMethodDecl>(FD))
480 return MD->isInstance() && MD->getThisType(Context)->isDependentType();
481 else
482 return false;
483 }();
484
485 QualType T = FD->getType()->isDependentType() || IsThisDependentType
486 ? Context.DependentTy
487 : lookupPromiseType(*this, FD, Loc);
488 if (T.isNull())
489 return nullptr;
490
491 auto *VD = VarDecl::Create(Context, FD, FD->getLocation(), FD->getLocation(),
492 &PP.getIdentifierTable().get("__promise"), T,
493 Context.getTrivialTypeSourceInfo(T, Loc), SC_None);
494 CheckVariableDeclarationType(VD);
495 if (VD->isInvalidDecl())
496 return nullptr;
497
498 auto *ScopeInfo = getCurFunction();
499 // Build a list of arguments, based on the coroutine functions arguments,
500 // that will be passed to the promise type's constructor.
501 llvm::SmallVector<Expr *, 4> CtorArgExprs;
502 auto &Moves = ScopeInfo->CoroutineParameterMoves;
503 for (auto *PD : FD->parameters()) {
504 if (PD->getType()->isDependentType())
505 continue;
506
507 auto RefExpr = ExprEmpty();
508 auto Move = Moves.find(PD);
509 if (Move != Moves.end()) {
510 // If a reference to the function parameter exists in the coroutine
511 // frame, use that reference.
512 auto *MoveDecl =
513 cast<VarDecl>(cast<DeclStmt>(Move->second)->getSingleDecl());
514 RefExpr = BuildDeclRefExpr(MoveDecl, MoveDecl->getType(),
515 ExprValueKind::VK_LValue, FD->getLocation());
516 } else {
517 // If the function parameter doesn't exist in the coroutine frame, it
518 // must be a scalar value. Use it directly.
519 assert(!PD->getType()->getAsCXXRecordDecl() &&(static_cast <bool> (!PD->getType()->getAsCXXRecordDecl
() && "Non-scalar types should have been moved and inserted into the "
"parameter moves map") ? void (0) : __assert_fail ("!PD->getType()->getAsCXXRecordDecl() && \"Non-scalar types should have been moved and inserted into the \" \"parameter moves map\""
, "/build/llvm-toolchain-snapshot-7~svn325118/tools/clang/lib/Sema/SemaCoroutine.cpp"
, 521, __extension__ __PRETTY_FUNCTION__))
520 "Non-scalar types should have been moved and inserted into the "(static_cast <bool> (!PD->getType()->getAsCXXRecordDecl
() && "Non-scalar types should have been moved and inserted into the "
"parameter moves map") ? void (0) : __assert_fail ("!PD->getType()->getAsCXXRecordDecl() && \"Non-scalar types should have been moved and inserted into the \" \"parameter moves map\""
, "/build/llvm-toolchain-snapshot-7~svn325118/tools/clang/lib/Sema/SemaCoroutine.cpp"
, 521, __extension__ __PRETTY_FUNCTION__))
521 "parameter moves map")(static_cast <bool> (!PD->getType()->getAsCXXRecordDecl
() && "Non-scalar types should have been moved and inserted into the "
"parameter moves map") ? void (0) : __assert_fail ("!PD->getType()->getAsCXXRecordDecl() && \"Non-scalar types should have been moved and inserted into the \" \"parameter moves map\""
, "/build/llvm-toolchain-snapshot-7~svn325118/tools/clang/lib/Sema/SemaCoroutine.cpp"
, 521, __extension__ __PRETTY_FUNCTION__))
;
522 RefExpr =
523 BuildDeclRefExpr(PD, PD->getOriginalType().getNonReferenceType(),
524 ExprValueKind::VK_LValue, FD->getLocation());
525 }
526
527 if (RefExpr.isInvalid())
528 return nullptr;
529 CtorArgExprs.push_back(RefExpr.get());
530 }
531
532 // Create an initialization sequence for the promise type using the
533 // constructor arguments, wrapped in a parenthesized list expression.
534 Expr *PLE = new (Context) ParenListExpr(Context, FD->getLocation(),
535 CtorArgExprs, FD->getLocation());
536 InitializedEntity Entity = InitializedEntity::InitializeVariable(VD);
537 InitializationKind Kind = InitializationKind::CreateForInit(
538 VD->getLocation(), /*DirectInit=*/true, PLE);
539 InitializationSequence InitSeq(*this, Entity, Kind, CtorArgExprs,
540 /*TopLevelOfInitList=*/false,
541 /*TreatUnavailableAsInvalid=*/false);
542
543 // Attempt to initialize the promise type with the arguments.
544 // If that fails, fall back to the promise type's default constructor.
545 if (InitSeq) {
546 ExprResult Result = InitSeq.Perform(*this, Entity, Kind, CtorArgExprs);
547 if (Result.isInvalid()) {
548 VD->setInvalidDecl();
549 } else if (Result.get()) {
550 VD->setInit(MaybeCreateExprWithCleanups(Result.get()));
551 VD->setInitStyle(VarDecl::CallInit);
552 CheckCompleteVariableDeclaration(VD);
553 }
554 } else
555 ActOnUninitializedDecl(VD);
556
557 FD->addDecl(VD);
558 return VD;
559}
560
561/// Check that this is a context in which a coroutine suspension can appear.
562static FunctionScopeInfo *checkCoroutineContext(Sema &S, SourceLocation Loc,
563 StringRef Keyword,
564 bool IsImplicit = false) {
565 if (!isValidCoroutineContext(S, Loc, Keyword))
566 return nullptr;
567
568 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~svn325118/tools/clang/lib/Sema/SemaCoroutine.cpp"
, 568, __extension__ __PRETTY_FUNCTION__))
;
569
570 auto *ScopeInfo = S.getCurFunction();
571 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~svn325118/tools/clang/lib/Sema/SemaCoroutine.cpp"
, 571, __extension__ __PRETTY_FUNCTION__))
;
572
573 if (ScopeInfo->FirstCoroutineStmtLoc.isInvalid() && !IsImplicit)
574 ScopeInfo->setFirstCoroutineStmt(Loc, Keyword);
575
576 if (ScopeInfo->CoroutinePromise)
577 return ScopeInfo;
578
579 if (!S.buildCoroutineParameterMoves(Loc))
580 return nullptr;
581
582 ScopeInfo->CoroutinePromise = S.buildCoroutinePromise(Loc);
583 if (!ScopeInfo->CoroutinePromise)
584 return nullptr;
585
586 return ScopeInfo;
587}
588
589bool Sema::ActOnCoroutineBodyStart(Scope *SC, SourceLocation KWLoc,
590 StringRef Keyword) {
591 if (!checkCoroutineContext(*this, KWLoc, Keyword))
592 return false;
593 auto *ScopeInfo = getCurFunction();
594 assert(ScopeInfo->CoroutinePromise)(static_cast <bool> (ScopeInfo->CoroutinePromise) ? void
(0) : __assert_fail ("ScopeInfo->CoroutinePromise", "/build/llvm-toolchain-snapshot-7~svn325118/tools/clang/lib/Sema/SemaCoroutine.cpp"
, 594, __extension__ __PRETTY_FUNCTION__))
;
595
596 // If we have existing coroutine statements then we have already built
597 // the initial and final suspend points.
598 if (!ScopeInfo->NeedsCoroutineSuspends)
599 return true;
600
601 ScopeInfo->setNeedsCoroutineSuspends(false);
602
603 auto *Fn = cast<FunctionDecl>(CurContext);
604 SourceLocation Loc = Fn->getLocation();
605 // Build the initial suspend point
606 auto buildSuspends = [&](StringRef Name) mutable -> StmtResult {
607 ExprResult Suspend =
608 buildPromiseCall(*this, ScopeInfo->CoroutinePromise, Loc, Name, None);
609 if (Suspend.isInvalid())
610 return StmtError();
611 Suspend = buildOperatorCoawaitCall(*this, SC, Loc, Suspend.get());
612 if (Suspend.isInvalid())
613 return StmtError();
614 Suspend = BuildResolvedCoawaitExpr(Loc, Suspend.get(),
615 /*IsImplicit*/ true);
616 Suspend = ActOnFinishFullExpr(Suspend.get());
617 if (Suspend.isInvalid()) {
618 Diag(Loc, diag::note_coroutine_promise_suspend_implicitly_required)
619 << ((Name == "initial_suspend") ? 0 : 1);
620 Diag(KWLoc, diag::note_declared_coroutine_here) << Keyword;
621 return StmtError();
622 }
623 return cast<Stmt>(Suspend.get());
624 };
625
626 StmtResult InitSuspend = buildSuspends("initial_suspend");
627 if (InitSuspend.isInvalid())
628 return true;
629
630 StmtResult FinalSuspend = buildSuspends("final_suspend");
631 if (FinalSuspend.isInvalid())
632 return true;
633
634 ScopeInfo->setCoroutineSuspends(InitSuspend.get(), FinalSuspend.get());
635
636 return true;
637}
638
639ExprResult Sema::ActOnCoawaitExpr(Scope *S, SourceLocation Loc, Expr *E) {
640 if (!ActOnCoroutineBodyStart(S, Loc, "co_await")) {
641 CorrectDelayedTyposInExpr(E);
642 return ExprError();
643 }
644
645 if (E->getType()->isPlaceholderType()) {
646 ExprResult R = CheckPlaceholderExpr(E);
647 if (R.isInvalid()) return ExprError();
648 E = R.get();
649 }
650 ExprResult Lookup = buildOperatorCoawaitLookupExpr(*this, S, Loc);
651 if (Lookup.isInvalid())
652 return ExprError();
653 return BuildUnresolvedCoawaitExpr(Loc, E,
654 cast<UnresolvedLookupExpr>(Lookup.get()));
655}
656
657ExprResult Sema::BuildUnresolvedCoawaitExpr(SourceLocation Loc, Expr *E,
658 UnresolvedLookupExpr *Lookup) {
659 auto *FSI = checkCoroutineContext(*this, Loc, "co_await");
660 if (!FSI)
661 return ExprError();
662
663 if (E->getType()->isPlaceholderType()) {
664 ExprResult R = CheckPlaceholderExpr(E);
665 if (R.isInvalid())
666 return ExprError();
667 E = R.get();
668 }
669
670 auto *Promise = FSI->CoroutinePromise;
671 if (Promise->getType()->isDependentType()) {
672 Expr *Res =
673 new (Context) DependentCoawaitExpr(Loc, Context.DependentTy, E, Lookup);
674 return Res;
675 }
676
677 auto *RD = Promise->getType()->getAsCXXRecordDecl();
678 if (lookupMember(*this, "await_transform", RD, Loc)) {
679 ExprResult R = buildPromiseCall(*this, Promise, Loc, "await_transform", E);
680 if (R.isInvalid()) {
681 Diag(Loc,
682 diag::note_coroutine_promise_implicit_await_transform_required_here)
683 << E->getSourceRange();
684 return ExprError();
685 }
686 E = R.get();
687 }
688 ExprResult Awaitable = buildOperatorCoawaitCall(*this, Loc, E, Lookup);
689 if (Awaitable.isInvalid())
690 return ExprError();
691
692 return BuildResolvedCoawaitExpr(Loc, Awaitable.get());
693}
694
695ExprResult Sema::BuildResolvedCoawaitExpr(SourceLocation Loc, Expr *E,
696 bool IsImplicit) {
697 auto *Coroutine = checkCoroutineContext(*this, Loc, "co_await", IsImplicit);
698 if (!Coroutine)
699 return ExprError();
700
701 if (E->getType()->isPlaceholderType()) {
702 ExprResult R = CheckPlaceholderExpr(E);
703 if (R.isInvalid()) return ExprError();
704 E = R.get();
705 }
706
707 if (E->getType()->isDependentType()) {
708 Expr *Res = new (Context)
709 CoawaitExpr(Loc, Context.DependentTy, E, IsImplicit);
710 return Res;
711 }
712
713 // If the expression is a temporary, materialize it as an lvalue so that we
714 // can use it multiple times.
715 if (E->getValueKind() == VK_RValue)
716 E = CreateMaterializeTemporaryExpr(E->getType(), E, true);
717
718 // Build the await_ready, await_suspend, await_resume calls.
719 ReadySuspendResumeResult RSS =
720 buildCoawaitCalls(*this, Coroutine->CoroutinePromise, Loc, E);
721 if (RSS.IsInvalid)
722 return ExprError();
723
724 Expr *Res =
725 new (Context) CoawaitExpr(Loc, E, RSS.Results[0], RSS.Results[1],
726 RSS.Results[2], RSS.OpaqueValue, IsImplicit);
727
728 return Res;
729}
730
731ExprResult Sema::ActOnCoyieldExpr(Scope *S, SourceLocation Loc, Expr *E) {
732 if (!ActOnCoroutineBodyStart(S, Loc, "co_yield")) {
733 CorrectDelayedTyposInExpr(E);
734 return ExprError();
735 }
736
737 // Build yield_value call.
738 ExprResult Awaitable = buildPromiseCall(
739 *this, getCurFunction()->CoroutinePromise, Loc, "yield_value", E);
740 if (Awaitable.isInvalid())
741 return ExprError();
742
743 // Build 'operator co_await' call.
744 Awaitable = buildOperatorCoawaitCall(*this, S, Loc, Awaitable.get());
745 if (Awaitable.isInvalid())
746 return ExprError();
747
748 return BuildCoyieldExpr(Loc, Awaitable.get());
749}
750ExprResult Sema::BuildCoyieldExpr(SourceLocation Loc, Expr *E) {
751 auto *Coroutine = checkCoroutineContext(*this, Loc, "co_yield");
752 if (!Coroutine)
753 return ExprError();
754
755 if (E->getType()->isPlaceholderType()) {
756 ExprResult R = CheckPlaceholderExpr(E);
757 if (R.isInvalid()) return ExprError();
758 E = R.get();
759 }
760
761 if (E->getType()->isDependentType()) {
762 Expr *Res = new (Context) CoyieldExpr(Loc, Context.DependentTy, E);
763 return Res;
764 }
765
766 // If the expression is a temporary, materialize it as an lvalue so that we
767 // can use it multiple times.
768 if (E->getValueKind() == VK_RValue)
769 E = CreateMaterializeTemporaryExpr(E->getType(), E, true);
770
771 // Build the await_ready, await_suspend, await_resume calls.
772 ReadySuspendResumeResult RSS =
773 buildCoawaitCalls(*this, Coroutine->CoroutinePromise, Loc, E);
774 if (RSS.IsInvalid)
775 return ExprError();
776
777 Expr *Res =
778 new (Context) CoyieldExpr(Loc, E, RSS.Results[0], RSS.Results[1],
779 RSS.Results[2], RSS.OpaqueValue);
780
781 return Res;
782}
783
784StmtResult Sema::ActOnCoreturnStmt(Scope *S, SourceLocation Loc, Expr *E) {
785 if (!ActOnCoroutineBodyStart(S, Loc, "co_return")) {
786 CorrectDelayedTyposInExpr(E);
787 return StmtError();
788 }
789 return BuildCoreturnStmt(Loc, E);
790}
791
792StmtResult Sema::BuildCoreturnStmt(SourceLocation Loc, Expr *E,
793 bool IsImplicit) {
794 auto *FSI = checkCoroutineContext(*this, Loc, "co_return", IsImplicit);
795 if (!FSI)
796 return StmtError();
797
798 if (E && E->getType()->isPlaceholderType() &&
799 !E->getType()->isSpecificPlaceholderType(BuiltinType::Overload)) {
800 ExprResult R = CheckPlaceholderExpr(E);
801 if (R.isInvalid()) return StmtError();
802 E = R.get();
803 }
804
805 // FIXME: If the operand is a reference to a variable that's about to go out
806 // of scope, we should treat the operand as an xvalue for this overload
807 // resolution.
808 VarDecl *Promise = FSI->CoroutinePromise;
809 ExprResult PC;
810 if (E && (isa<InitListExpr>(E) || !E->getType()->isVoidType())) {
811 PC = buildPromiseCall(*this, Promise, Loc, "return_value", E);
812 } else {
813 E = MakeFullDiscardedValueExpr(E).get();
814 PC = buildPromiseCall(*this, Promise, Loc, "return_void", None);
815 }
816 if (PC.isInvalid())
817 return StmtError();
818
819 Expr *PCE = ActOnFinishFullExpr(PC.get()).get();
820
821 Stmt *Res = new (Context) CoreturnStmt(Loc, E, PCE, IsImplicit);
822 return Res;
823}
824
825/// Look up the std::nothrow object.
826static Expr *buildStdNoThrowDeclRef(Sema &S, SourceLocation Loc) {
827 NamespaceDecl *Std = S.getStdNamespace();
828 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~svn325118/tools/clang/lib/Sema/SemaCoroutine.cpp"
, 828, __extension__ __PRETTY_FUNCTION__))
;
829
830 LookupResult Result(S, &S.PP.getIdentifierTable().get("nothrow"), Loc,
831 Sema::LookupOrdinaryName);
832 if (!S.LookupQualifiedName(Result, Std)) {
833 // FIXME: <experimental/coroutine> should have been included already.
834 // If we require it to include <new> then this diagnostic is no longer
835 // needed.
836 S.Diag(Loc, diag::err_implicit_coroutine_std_nothrow_type_not_found);
837 return nullptr;
838 }
839
840 auto *VD = Result.getAsSingle<VarDecl>();
841 if (!VD) {
842 Result.suppressDiagnostics();
843 // We found something weird. Complain about the first thing we found.
844 NamedDecl *Found = *Result.begin();
845 S.Diag(Found->getLocation(), diag::err_malformed_std_nothrow);
846 return nullptr;
847 }
848
849 ExprResult DR = S.BuildDeclRefExpr(VD, VD->getType(), VK_LValue, Loc);
850 if (DR.isInvalid())
851 return nullptr;
852
853 return DR.get();
854}
855
856// Find an appropriate delete for the promise.
857static FunctionDecl *findDeleteForPromise(Sema &S, SourceLocation Loc,
858 QualType PromiseType) {
859 FunctionDecl *OperatorDelete = nullptr;
860
861 DeclarationName DeleteName =
862 S.Context.DeclarationNames.getCXXOperatorName(OO_Delete);
863
864 auto *PointeeRD = PromiseType->getAsCXXRecordDecl();
865 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~svn325118/tools/clang/lib/Sema/SemaCoroutine.cpp"
, 865, __extension__ __PRETTY_FUNCTION__))
;
866
867 if (S.FindDeallocationFunction(Loc, PointeeRD, DeleteName, OperatorDelete))
868 return nullptr;
869
870 if (!OperatorDelete) {
871 // Look for a global declaration.
872 const bool CanProvideSize = S.isCompleteType(Loc, PromiseType);
873 const bool Overaligned = false;
874 OperatorDelete = S.FindUsualDeallocationFunction(Loc, CanProvideSize,
875 Overaligned, DeleteName);
876 }
877 S.MarkFunctionReferenced(Loc, OperatorDelete);
878 return OperatorDelete;
879}
880
881
882void Sema::CheckCompletedCoroutineBody(FunctionDecl *FD, Stmt *&Body) {
883 FunctionScopeInfo *Fn = getCurFunction();
884 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~svn325118/tools/clang/lib/Sema/SemaCoroutine.cpp"
, 884, __extension__ __PRETTY_FUNCTION__))
;
885 if (!Body) {
1
Assuming the condition is false
2
Taking false branch
886 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~svn325118/tools/clang/lib/Sema/SemaCoroutine.cpp"
, 887, __extension__ __PRETTY_FUNCTION__))
887 "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~svn325118/tools/clang/lib/Sema/SemaCoroutine.cpp"
, 887, __extension__ __PRETTY_FUNCTION__))
;
888 return;
889 }
890 // We have a function that uses coroutine keywords, but we failed to build
891 // the promise type.
892 if (!Fn->CoroutinePromise)
3
Assuming the condition is false
4
Taking false branch
893 return FD->setInvalidDecl();
894
895 if (isa<CoroutineBodyStmt>(Body)) {
5
Taking false branch
896 // Nothing todo. the body is already a transformed coroutine body statement.
897 return;
898 }
899
900 // Coroutines [stmt.return]p1:
901 // A return statement shall not appear in a coroutine.
902 if (Fn->FirstReturnLoc.isValid()) {
6
Taking false branch
903 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~svn325118/tools/clang/lib/Sema/SemaCoroutine.cpp"
, 904, __extension__ __PRETTY_FUNCTION__))
904 "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~svn325118/tools/clang/lib/Sema/SemaCoroutine.cpp"
, 904, __extension__ __PRETTY_FUNCTION__))
;
905 Diag(Fn->FirstReturnLoc, diag::err_return_in_coroutine);
906 Diag(Fn->FirstCoroutineStmtLoc, diag::note_declared_coroutine_here)
907 << Fn->getFirstCoroutineStmtKeyword();
908 }
909 CoroutineStmtBuilder Builder(*this, *FD, *Fn, Body);
7
Calling constructor for 'CoroutineStmtBuilder'
12
Returning from constructor for 'CoroutineStmtBuilder'
910 if (Builder.isInvalid() || !Builder.buildStatements())
13
Calling 'CoroutineStmtBuilder::buildStatements'
911 return FD->setInvalidDecl();
912
913 // Build body for the coroutine wrapper statement.
914 Body = CoroutineBodyStmt::Create(Context, Builder);
915}
916
917CoroutineStmtBuilder::CoroutineStmtBuilder(Sema &S, FunctionDecl &FD,
918 sema::FunctionScopeInfo &Fn,
919 Stmt *Body)
920 : S(S), FD(FD), Fn(Fn), Loc(FD.getLocation()),
921 IsPromiseDependentType(
922 !Fn.CoroutinePromise ||
8
Assuming the condition is false
923 Fn.CoroutinePromise->getType()->isDependentType()) {
924 this->Body = Body;
925
926 for (auto KV : Fn.CoroutineParameterMoves)
10
Assuming '__begin' is equal to '__end'
927 this->ParamMovesVector.push_back(KV.second);
928 this->ParamMoves = this->ParamMovesVector;
929
930 if (!IsPromiseDependentType) {
11
Taking false branch
931 PromiseRecordDecl = Fn.CoroutinePromise->getType()->getAsCXXRecordDecl();
932 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~svn325118/tools/clang/lib/Sema/SemaCoroutine.cpp"
, 932, __extension__ __PRETTY_FUNCTION__))
;
933 }
934 this->IsValid = makePromiseStmt() && makeInitialAndFinalSuspend();
935}
936
937bool CoroutineStmtBuilder::buildStatements() {
938 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~svn325118/tools/clang/lib/Sema/SemaCoroutine.cpp"
, 938, __extension__ __PRETTY_FUNCTION__))
;
939 this->IsValid = makeReturnObject();
940 if (this->IsValid && !IsPromiseDependentType)
14
Taking true branch
941 buildDependentStatements();
15
Calling 'CoroutineStmtBuilder::buildDependentStatements'
942 return this->IsValid;
943}
944
945bool CoroutineStmtBuilder::buildDependentStatements() {
946 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~svn325118/tools/clang/lib/Sema/SemaCoroutine.cpp"
, 946, __extension__ __PRETTY_FUNCTION__))
;
947 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~svn325118/tools/clang/lib/Sema/SemaCoroutine.cpp"
, 948, __extension__ __PRETTY_FUNCTION__))
948 "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~svn325118/tools/clang/lib/Sema/SemaCoroutine.cpp"
, 948, __extension__ __PRETTY_FUNCTION__))
;
949 this->IsValid = makeOnException() && makeOnFallthrough() &&
16
Calling 'CoroutineStmtBuilder::makeOnFallthrough'
950 makeGroDeclAndReturnStmt() && makeReturnOnAllocFailure() &&
951 makeNewAndDeleteExpr();
952 return this->IsValid;
953}
954
955bool CoroutineStmtBuilder::makePromiseStmt() {
956 // Form a declaration statement for the promise declaration, so that AST
957 // visitors can more easily find it.
958 StmtResult PromiseStmt =
959 S.ActOnDeclStmt(S.ConvertDeclToDeclGroup(Fn.CoroutinePromise), Loc, Loc);
960 if (PromiseStmt.isInvalid())
961 return false;
962
963 this->Promise = PromiseStmt.get();
964 return true;
965}
966
967bool CoroutineStmtBuilder::makeInitialAndFinalSuspend() {
968 if (Fn.hasInvalidCoroutineSuspends())
969 return false;
970 this->InitialSuspend = cast<Expr>(Fn.CoroutineSuspends.first);
971 this->FinalSuspend = cast<Expr>(Fn.CoroutineSuspends.second);
972 return true;
973}
974
975static bool diagReturnOnAllocFailure(Sema &S, Expr *E,
976 CXXRecordDecl *PromiseRecordDecl,
977 FunctionScopeInfo &Fn) {
978 auto Loc = E->getExprLoc();
979 if (auto *DeclRef = dyn_cast_or_null<DeclRefExpr>(E)) {
980 auto *Decl = DeclRef->getDecl();
981 if (CXXMethodDecl *Method = dyn_cast_or_null<CXXMethodDecl>(Decl)) {
982 if (Method->isStatic())
983 return true;
984 else
985 Loc = Decl->getLocation();
986 }
987 }
988
989 S.Diag(
990 Loc,
991 diag::err_coroutine_promise_get_return_object_on_allocation_failure)
992 << PromiseRecordDecl;
993 S.Diag(Fn.FirstCoroutineStmtLoc, diag::note_declared_coroutine_here)
994 << Fn.getFirstCoroutineStmtKeyword();
995 return false;
996}
997
998bool CoroutineStmtBuilder::makeReturnOnAllocFailure() {
999 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~svn325118/tools/clang/lib/Sema/SemaCoroutine.cpp"
, 1000, __extension__ __PRETTY_FUNCTION__))
1000 "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~svn325118/tools/clang/lib/Sema/SemaCoroutine.cpp"
, 1000, __extension__ __PRETTY_FUNCTION__))
;
1001
1002 // [dcl.fct.def.coroutine]/8
1003 // The unqualified-id get_return_object_on_allocation_failure is looked up in
1004 // the scope of class P by class member access lookup (3.4.5). ...
1005 // If an allocation function returns nullptr, ... the coroutine return value
1006 // is obtained by a call to ... get_return_object_on_allocation_failure().
1007
1008 DeclarationName DN =
1009 S.PP.getIdentifierInfo("get_return_object_on_allocation_failure");
1010 LookupResult Found(S, DN, Loc, Sema::LookupMemberName);
1011 if (!S.LookupQualifiedName(Found, PromiseRecordDecl))
1012 return true;
1013
1014 CXXScopeSpec SS;
1015 ExprResult DeclNameExpr =
1016 S.BuildDeclarationNameExpr(SS, Found, /*NeedsADL=*/false);
1017 if (DeclNameExpr.isInvalid())
1018 return false;
1019
1020 if (!diagReturnOnAllocFailure(S, DeclNameExpr.get(), PromiseRecordDecl, Fn))
1021 return false;
1022
1023 ExprResult ReturnObjectOnAllocationFailure =
1024 S.ActOnCallExpr(nullptr, DeclNameExpr.get(), Loc, {}, Loc);
1025 if (ReturnObjectOnAllocationFailure.isInvalid())
1026 return false;
1027
1028 StmtResult ReturnStmt =
1029 S.BuildReturnStmt(Loc, ReturnObjectOnAllocationFailure.get());
1030 if (ReturnStmt.isInvalid()) {
1031 S.Diag(Found.getFoundDecl()->getLocation(), diag::note_member_declared_here)
1032 << DN;
1033 S.Diag(Fn.FirstCoroutineStmtLoc, diag::note_declared_coroutine_here)
1034 << Fn.getFirstCoroutineStmtKeyword();
1035 return false;
1036 }
1037
1038 this->ReturnStmtOnAllocFailure = ReturnStmt.get();
1039 return true;
1040}
1041
1042bool CoroutineStmtBuilder::makeNewAndDeleteExpr() {
1043 // Form and check allocation and deallocation calls.
1044 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~svn325118/tools/clang/lib/Sema/SemaCoroutine.cpp"
, 1045, __extension__ __PRETTY_FUNCTION__))
1045 "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~svn325118/tools/clang/lib/Sema/SemaCoroutine.cpp"
, 1045, __extension__ __PRETTY_FUNCTION__))
;
1046 QualType PromiseType = Fn.CoroutinePromise->getType();
1047
1048 if (S.RequireCompleteType(Loc, PromiseType, diag::err_incomplete_type))
1049 return false;
1050
1051 const bool RequiresNoThrowAlloc = ReturnStmtOnAllocFailure != nullptr;
1052
1053 // FIXME: Add support for stateful allocators.
1054
1055 FunctionDecl *OperatorNew = nullptr;
1056 FunctionDecl *OperatorDelete = nullptr;
1057 FunctionDecl *UnusedResult = nullptr;
1058 bool PassAlignment = false;
1059 SmallVector<Expr *, 1> PlacementArgs;
1060
1061 S.FindAllocationFunctions(Loc, SourceRange(),
1062 /*UseGlobal*/ false, PromiseType,
1063 /*isArray*/ false, PassAlignment, PlacementArgs,
1064 OperatorNew, UnusedResult);
1065
1066 bool IsGlobalOverload =
1067 OperatorNew && !isa<CXXRecordDecl>(OperatorNew->getDeclContext());
1068 // If we didn't find a class-local new declaration and non-throwing new
1069 // was is required then we need to lookup the non-throwing global operator
1070 // instead.
1071 if (RequiresNoThrowAlloc && (!OperatorNew || IsGlobalOverload)) {
1072 auto *StdNoThrow = buildStdNoThrowDeclRef(S, Loc);
1073 if (!StdNoThrow)
1074 return false;
1075 PlacementArgs = {StdNoThrow};
1076 OperatorNew = nullptr;
1077 S.FindAllocationFunctions(Loc, SourceRange(),
1078 /*UseGlobal*/ true, PromiseType,
1079 /*isArray*/ false, PassAlignment, PlacementArgs,
1080 OperatorNew, UnusedResult);
1081 }
1082
1083 assert(OperatorNew && "expected definition of operator new to be found")(static_cast <bool> (OperatorNew && "expected definition of operator new to be found"
) ? void (0) : __assert_fail ("OperatorNew && \"expected definition of operator new to be found\""
, "/build/llvm-toolchain-snapshot-7~svn325118/tools/clang/lib/Sema/SemaCoroutine.cpp"
, 1083, __extension__ __PRETTY_FUNCTION__))
;
1084
1085 if (RequiresNoThrowAlloc) {
1086 const auto *FT = OperatorNew->getType()->getAs<FunctionProtoType>();
1087 if (!FT->isNothrow(S.Context, /*ResultIfDependent*/ false)) {
1088 S.Diag(OperatorNew->getLocation(),
1089 diag::err_coroutine_promise_new_requires_nothrow)
1090 << OperatorNew;
1091 S.Diag(Loc, diag::note_coroutine_promise_call_implicitly_required)
1092 << OperatorNew;
1093 return false;
1094 }
1095 }
1096
1097 if ((OperatorDelete = findDeleteForPromise(S, Loc, PromiseType)) == nullptr)
1098 return false;
1099
1100 Expr *FramePtr =
1101 buildBuiltinCall(S, Loc, Builtin::BI__builtin_coro_frame, {});
1102
1103 Expr *FrameSize =
1104 buildBuiltinCall(S, Loc, Builtin::BI__builtin_coro_size, {});
1105
1106 // Make new call.
1107
1108 ExprResult NewRef =
1109 S.BuildDeclRefExpr(OperatorNew, OperatorNew->getType(), VK_LValue, Loc);
1110 if (NewRef.isInvalid())
1111 return false;
1112
1113 SmallVector<Expr *, 2> NewArgs(1, FrameSize);
1114 for (auto Arg : PlacementArgs)
1115 NewArgs.push_back(Arg);
1116
1117 ExprResult NewExpr =
1118 S.ActOnCallExpr(S.getCurScope(), NewRef.get(), Loc, NewArgs, Loc);
1119 NewExpr = S.ActOnFinishFullExpr(NewExpr.get());
1120 if (NewExpr.isInvalid())
1121 return false;
1122
1123 // Make delete call.
1124
1125 QualType OpDeleteQualType = OperatorDelete->getType();
1126
1127 ExprResult DeleteRef =
1128 S.BuildDeclRefExpr(OperatorDelete, OpDeleteQualType, VK_LValue, Loc);
1129 if (DeleteRef.isInvalid())
1130 return false;
1131
1132 Expr *CoroFree =
1133 buildBuiltinCall(S, Loc, Builtin::BI__builtin_coro_free, {FramePtr});
1134
1135 SmallVector<Expr *, 2> DeleteArgs{CoroFree};
1136
1137 // Check if we need to pass the size.
1138 const auto *OpDeleteType =
1139 OpDeleteQualType.getTypePtr()->getAs<FunctionProtoType>();
1140 if (OpDeleteType->getNumParams() > 1)
1141 DeleteArgs.push_back(FrameSize);
1142
1143 ExprResult DeleteExpr =
1144 S.ActOnCallExpr(S.getCurScope(), DeleteRef.get(), Loc, DeleteArgs, Loc);
1145 DeleteExpr = S.ActOnFinishFullExpr(DeleteExpr.get());
1146 if (DeleteExpr.isInvalid())
1147 return false;
1148
1149 this->Allocate = NewExpr.get();
1150 this->Deallocate = DeleteExpr.get();
1151
1152 return true;
1153}
1154
1155bool CoroutineStmtBuilder::makeOnFallthrough() {
1156 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~svn325118/tools/clang/lib/Sema/SemaCoroutine.cpp"
, 1157, __extension__ __PRETTY_FUNCTION__))
1157 "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~svn325118/tools/clang/lib/Sema/SemaCoroutine.cpp"
, 1157, __extension__ __PRETTY_FUNCTION__))
;
1158
1159 // [dcl.fct.def.coroutine]/4
1160 // The unqualified-ids 'return_void' and 'return_value' are looked up in
1161 // the scope of class P. If both are found, the program is ill-formed.
1162 bool HasRVoid, HasRValue;
1163 LookupResult LRVoid =
1164 lookupMember(S, "return_void", PromiseRecordDecl, Loc, HasRVoid);
1165 LookupResult LRValue =
1166 lookupMember(S, "return_value", PromiseRecordDecl, Loc, HasRValue);
1167
1168 StmtResult Fallthrough;
1169 if (HasRVoid && HasRValue) {
17
Assuming 'HasRVoid' is 0
1170 // FIXME Improve this diagnostic
1171 S.Diag(FD.getLocation(),
1172 diag::err_coroutine_promise_incompatible_return_functions)
1173 << PromiseRecordDecl;
1174 S.Diag(LRVoid.getRepresentativeDecl()->getLocation(),
1175 diag::note_member_first_declared_here)
1176 << LRVoid.getLookupName();
1177 S.Diag(LRValue.getRepresentativeDecl()->getLocation(),
1178 diag::note_member_first_declared_here)
1179 << LRValue.getLookupName();
1180 return false;
1181 } else if (!HasRVoid && !HasRValue) {
18
Assuming 'HasRValue' is 0
19
Taking true branch
1182 // FIXME: The PDTS currently specifies this case as UB, not ill-formed.
1183 // However we still diagnose this as an error since until the PDTS is fixed.
1184 S.Diag(FD.getLocation(),
1185 diag::err_coroutine_promise_requires_return_function)
1186 << PromiseRecordDecl;
1187 S.Diag(PromiseRecordDecl->getLocation(), diag::note_defined_here)
20
Called C++ object pointer is null
1188 << PromiseRecordDecl;
1189 return false;
1190 } else if (HasRVoid) {
1191 // If the unqualified-id return_void is found, flowing off the end of a
1192 // coroutine is equivalent to a co_return with no operand. Otherwise,
1193 // flowing off the end of a coroutine results in undefined behavior.
1194 Fallthrough = S.BuildCoreturnStmt(FD.getLocation(), nullptr,
1195 /*IsImplicit*/false);
1196 Fallthrough = S.ActOnFinishFullStmt(Fallthrough.get());
1197 if (Fallthrough.isInvalid())
1198 return false;
1199 }
1200
1201 this->OnFallthrough = Fallthrough.get();
1202 return true;
1203}
1204
1205bool CoroutineStmtBuilder::makeOnException() {
1206 // Try to form 'p.unhandled_exception();'
1207 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~svn325118/tools/clang/lib/Sema/SemaCoroutine.cpp"
, 1208, __extension__ __PRETTY_FUNCTION__))
1208 "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~svn325118/tools/clang/lib/Sema/SemaCoroutine.cpp"
, 1208, __extension__ __PRETTY_FUNCTION__))
;
1209
1210 const bool RequireUnhandledException = S.getLangOpts().CXXExceptions;
1211
1212 if (!lookupMember(S, "unhandled_exception", PromiseRecordDecl, Loc)) {
1213 auto DiagID =
1214 RequireUnhandledException
1215 ? diag::err_coroutine_promise_unhandled_exception_required
1216 : diag::
1217 warn_coroutine_promise_unhandled_exception_required_with_exceptions;
1218 S.Diag(Loc, DiagID) << PromiseRecordDecl;
1219 S.Diag(PromiseRecordDecl->getLocation(), diag::note_defined_here)
1220 << PromiseRecordDecl;
1221 return !RequireUnhandledException;
1222 }
1223
1224 // If exceptions are disabled, don't try to build OnException.
1225 if (!S.getLangOpts().CXXExceptions)
1226 return true;
1227
1228 ExprResult UnhandledException = buildPromiseCall(S, Fn.CoroutinePromise, Loc,
1229 "unhandled_exception", None);
1230 UnhandledException = S.ActOnFinishFullExpr(UnhandledException.get(), Loc);
1231 if (UnhandledException.isInvalid())
1232 return false;
1233
1234 // Since the body of the coroutine will be wrapped in try-catch, it will
1235 // be incompatible with SEH __try if present in a function.
1236 if (!S.getLangOpts().Borland && Fn.FirstSEHTryLoc.isValid()) {
1237 S.Diag(Fn.FirstSEHTryLoc, diag::err_seh_in_a_coroutine_with_cxx_exceptions);
1238 S.Diag(Fn.FirstCoroutineStmtLoc, diag::note_declared_coroutine_here)
1239 << Fn.getFirstCoroutineStmtKeyword();
1240 return false;
1241 }
1242
1243 this->OnException = UnhandledException.get();
1244 return true;
1245}
1246
1247bool CoroutineStmtBuilder::makeReturnObject() {
1248 // Build implicit 'p.get_return_object()' expression and form initialization
1249 // of return type from it.
1250 ExprResult ReturnObject =
1251 buildPromiseCall(S, Fn.CoroutinePromise, Loc, "get_return_object", None);
1252 if (ReturnObject.isInvalid())
1253 return false;
1254
1255 this->ReturnValue = ReturnObject.get();
1256 return true;
1257}
1258
1259static void noteMemberDeclaredHere(Sema &S, Expr *E, FunctionScopeInfo &Fn) {
1260 if (auto *MbrRef = dyn_cast<CXXMemberCallExpr>(E)) {
1261 auto *MethodDecl = MbrRef->getMethodDecl();
1262 S.Diag(MethodDecl->getLocation(), diag::note_member_declared_here)
1263 << MethodDecl;
1264 }
1265 S.Diag(Fn.FirstCoroutineStmtLoc, diag::note_declared_coroutine_here)
1266 << Fn.getFirstCoroutineStmtKeyword();
1267}
1268
1269bool CoroutineStmtBuilder::makeGroDeclAndReturnStmt() {
1270 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~svn325118/tools/clang/lib/Sema/SemaCoroutine.cpp"
, 1271, __extension__ __PRETTY_FUNCTION__))
1271 "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~svn325118/tools/clang/lib/Sema/SemaCoroutine.cpp"
, 1271, __extension__ __PRETTY_FUNCTION__))
;
1272 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~svn325118/tools/clang/lib/Sema/SemaCoroutine.cpp"
, 1272, __extension__ __PRETTY_FUNCTION__))
;
1273
1274 QualType const GroType = this->ReturnValue->getType();
1275 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~svn325118/tools/clang/lib/Sema/SemaCoroutine.cpp"
, 1276, __extension__ __PRETTY_FUNCTION__))
1276 "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~svn325118/tools/clang/lib/Sema/SemaCoroutine.cpp"
, 1276, __extension__ __PRETTY_FUNCTION__))
;
1277
1278 QualType const FnRetType = FD.getReturnType();
1279 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~svn325118/tools/clang/lib/Sema/SemaCoroutine.cpp"
, 1280, __extension__ __PRETTY_FUNCTION__))
1280 "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~svn325118/tools/clang/lib/Sema/SemaCoroutine.cpp"
, 1280, __extension__ __PRETTY_FUNCTION__))
;
1281
1282 if (FnRetType->isVoidType()) {
1283 ExprResult Res = S.ActOnFinishFullExpr(this->ReturnValue, Loc);
1284 if (Res.isInvalid())
1285 return false;
1286
1287 this->ResultDecl = Res.get();
1288 return true;
1289 }
1290
1291 if (GroType->isVoidType()) {
1292 // Trigger a nice error message.
1293 InitializedEntity Entity =
1294 InitializedEntity::InitializeResult(Loc, FnRetType, false);
1295 S.PerformMoveOrCopyInitialization(Entity, nullptr, FnRetType, ReturnValue);
1296 noteMemberDeclaredHere(S, ReturnValue, Fn);
1297 return false;
1298 }
1299
1300 auto *GroDecl = VarDecl::Create(
1301 S.Context, &FD, FD.getLocation(), FD.getLocation(),
1302 &S.PP.getIdentifierTable().get("__coro_gro"), GroType,
1303 S.Context.getTrivialTypeSourceInfo(GroType, Loc), SC_None);
1304
1305 S.CheckVariableDeclarationType(GroDecl);
1306 if (GroDecl->isInvalidDecl())
1307 return false;
1308
1309 InitializedEntity Entity = InitializedEntity::InitializeVariable(GroDecl);
1310 ExprResult Res = S.PerformMoveOrCopyInitialization(Entity, nullptr, GroType,
1311 this->ReturnValue);
1312 if (Res.isInvalid())
1313 return false;
1314
1315 Res = S.ActOnFinishFullExpr(Res.get());
1316 if (Res.isInvalid())
1317 return false;
1318
1319 S.AddInitializerToDecl(GroDecl, Res.get(),
1320 /*DirectInit=*/false);
1321
1322 S.FinalizeDeclaration(GroDecl);
1323
1324 // Form a declaration statement for the return declaration, so that AST
1325 // visitors can more easily find it.
1326 StmtResult GroDeclStmt =
1327 S.ActOnDeclStmt(S.ConvertDeclToDeclGroup(GroDecl), Loc, Loc);
1328 if (GroDeclStmt.isInvalid())
1329 return false;
1330
1331 this->ResultDecl = GroDeclStmt.get();
1332
1333 ExprResult declRef = S.BuildDeclRefExpr(GroDecl, GroType, VK_LValue, Loc);
1334 if (declRef.isInvalid())
1335 return false;
1336
1337 StmtResult ReturnStmt = S.BuildReturnStmt(Loc, declRef.get());
1338 if (ReturnStmt.isInvalid()) {
1339 noteMemberDeclaredHere(S, ReturnValue, Fn);
1340 return false;
1341 }
1342 if (cast<clang::ReturnStmt>(ReturnStmt.get())->getNRVOCandidate() == GroDecl)
1343 GroDecl->setNRVOVariable(true);
1344
1345 this->ReturnStmt = ReturnStmt.get();
1346 return true;
1347}
1348
1349// Create a static_cast\<T&&>(expr).
1350static Expr *castForMoving(Sema &S, Expr *E, QualType T = QualType()) {
1351 if (T.isNull())
1352 T = E->getType();
1353 QualType TargetType = S.BuildReferenceType(
1354 T, /*SpelledAsLValue*/ false, SourceLocation(), DeclarationName());
1355 SourceLocation ExprLoc = E->getLocStart();
1356 TypeSourceInfo *TargetLoc =
1357 S.Context.getTrivialTypeSourceInfo(TargetType, ExprLoc);
1358
1359 return S
1360 .BuildCXXNamedCast(ExprLoc, tok::kw_static_cast, TargetLoc, E,
1361 SourceRange(ExprLoc, ExprLoc), E->getSourceRange())
1362 .get();
1363}
1364
1365/// \brief Build a variable declaration for move parameter.
1366static VarDecl *buildVarDecl(Sema &S, SourceLocation Loc, QualType Type,
1367 IdentifierInfo *II) {
1368 TypeSourceInfo *TInfo = S.Context.getTrivialTypeSourceInfo(Type, Loc);
1369 VarDecl *Decl = VarDecl::Create(S.Context, S.CurContext, Loc, Loc, II, Type,
1370 TInfo, SC_None);
1371 Decl->setImplicit();
1372 return Decl;
1373}
1374
1375// Build statements that move coroutine function parameters to the coroutine
1376// frame, and store them on the function scope info.
1377bool Sema::buildCoroutineParameterMoves(SourceLocation Loc) {
1378 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~svn325118/tools/clang/lib/Sema/SemaCoroutine.cpp"
, 1378, __extension__ __PRETTY_FUNCTION__))
;
1379 auto *FD = cast<FunctionDecl>(CurContext);
1380
1381 auto *ScopeInfo = getCurFunction();
1382 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~svn325118/tools/clang/lib/Sema/SemaCoroutine.cpp"
, 1383, __extension__ __PRETTY_FUNCTION__))
1383 "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~svn325118/tools/clang/lib/Sema/SemaCoroutine.cpp"
, 1383, __extension__ __PRETTY_FUNCTION__))
;
1384
1385 for (auto *PD : FD->parameters()) {
1386 if (PD->getType()->isDependentType())
1387 continue;
1388
1389 // No need to copy scalars, LLVM will take care of them.
1390 if (PD->getType()->getAsCXXRecordDecl()) {
1391 ExprResult PDRefExpr = BuildDeclRefExpr(
1392 PD, PD->getType(), ExprValueKind::VK_LValue, Loc); // FIXME: scope?
1393 if (PDRefExpr.isInvalid())
1394 return false;
1395
1396 Expr *CExpr = castForMoving(*this, PDRefExpr.get());
1397
1398 auto D = buildVarDecl(*this, Loc, PD->getType(), PD->getIdentifier());
1399 AddInitializerToDecl(D, CExpr, /*DirectInit=*/true);
1400
1401 // Convert decl to a statement.
1402 StmtResult Stmt = ActOnDeclStmt(ConvertDeclToDeclGroup(D), Loc, Loc);
1403 if (Stmt.isInvalid())
1404 return false;
1405
1406 ScopeInfo->CoroutineParameterMoves.insert(std::make_pair(PD, Stmt.get()));
1407 }
1408 }
1409 return true;
1410}
1411
1412StmtResult Sema::BuildCoroutineBodyStmt(CoroutineBodyStmt::CtorArgs Args) {
1413 CoroutineBodyStmt *Res = CoroutineBodyStmt::Create(Context, Args);
1414 if (!Res)
1415 return StmtError();
1416 return Res;
1417}

/build/llvm-toolchain-snapshot-7~svn325118/tools/clang/lib/Sema/CoroutineStmtBuilder.h

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
23namespace clang {
24
25class 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;
9
Null pointer value stored to 'Builder.PromiseRecordDecl'
34
35public:
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
56private:
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