1 //===--- ParseOpenMP.cpp - OpenMP directives parsing ----------------------===//
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 /// \file
10 /// \brief This file implements parsing of all OpenMP directives and clauses.
11 ///
12 //===----------------------------------------------------------------------===//
13 
14 #include "RAIIObjectsForParser.h"
15 #include "clang/AST/ASTContext.h"
16 #include "clang/AST/StmtOpenMP.h"
17 #include "clang/Parse/ParseDiagnostic.h"
18 #include "clang/Parse/Parser.h"
19 #include "clang/Sema/Scope.h"
20 #include "llvm/ADT/PointerIntPair.h"
21 
22 using namespace clang;
23 
24 //===----------------------------------------------------------------------===//
25 // OpenMP declarative directives.
26 //===----------------------------------------------------------------------===//
27 
28 namespace {
29 enum OpenMPDirectiveKindEx {
30   OMPD_cancellation = OMPD_unknown + 1,
31   OMPD_data,
32   OMPD_declare,
33   OMPD_end,
34   OMPD_end_declare,
35   OMPD_enter,
36   OMPD_exit,
37   OMPD_point,
38   OMPD_reduction,
39   OMPD_target_enter,
40   OMPD_target_exit,
41   OMPD_update,
42   OMPD_distribute_parallel,
43   OMPD_teams_distribute_parallel,
44   OMPD_target_teams_distribute_parallel
45 };
46 
47 class ThreadprivateListParserHelper final {
48   SmallVector<Expr *, 4> Identifiers;
49   Parser *P;
50 
51 public:
52   ThreadprivateListParserHelper(Parser *P) : P(P) {}
53   void operator()(CXXScopeSpec &SS, DeclarationNameInfo NameInfo) {
54     ExprResult Res =
55         P->getActions().ActOnOpenMPIdExpression(P->getCurScope(), SS, NameInfo);
56     if (Res.isUsable())
57       Identifiers.push_back(Res.get());
58   }
59   llvm::ArrayRef<Expr *> getIdentifiers() const { return Identifiers; }
60 };
61 } // namespace
62 
63 // Map token string to extended OMP token kind that are
64 // OpenMPDirectiveKind + OpenMPDirectiveKindEx.
65 static unsigned getOpenMPDirectiveKindEx(StringRef S) {
66   auto DKind = getOpenMPDirectiveKind(S);
67   if (DKind != OMPD_unknown)
68     return DKind;
69 
70   return llvm::StringSwitch<unsigned>(S)
71       .Case("cancellation", OMPD_cancellation)
72       .Case("data", OMPD_data)
73       .Case("declare", OMPD_declare)
74       .Case("end", OMPD_end)
75       .Case("enter", OMPD_enter)
76       .Case("exit", OMPD_exit)
77       .Case("point", OMPD_point)
78       .Case("reduction", OMPD_reduction)
79       .Case("update", OMPD_update)
80       .Default(OMPD_unknown);
81 }
82 
83 static OpenMPDirectiveKind ParseOpenMPDirectiveKind(Parser &P) {
84   // Array of foldings: F[i][0] F[i][1] ===> F[i][2].
85   // E.g.: OMPD_for OMPD_simd ===> OMPD_for_simd
86   // TODO: add other combined directives in topological order.
87   static const unsigned F[][3] = {
88     { OMPD_cancellation, OMPD_point, OMPD_cancellation_point },
89     { OMPD_declare, OMPD_reduction, OMPD_declare_reduction },
90     { OMPD_declare, OMPD_simd, OMPD_declare_simd },
91     { OMPD_declare, OMPD_target, OMPD_declare_target },
92     { OMPD_distribute, OMPD_parallel, OMPD_distribute_parallel },
93     { OMPD_distribute_parallel, OMPD_for, OMPD_distribute_parallel_for },
94     { OMPD_distribute_parallel_for, OMPD_simd,
95       OMPD_distribute_parallel_for_simd },
96     { OMPD_distribute, OMPD_simd, OMPD_distribute_simd },
97     { OMPD_end, OMPD_declare, OMPD_end_declare },
98     { OMPD_end_declare, OMPD_target, OMPD_end_declare_target },
99     { OMPD_target, OMPD_data, OMPD_target_data },
100     { OMPD_target, OMPD_enter, OMPD_target_enter },
101     { OMPD_target, OMPD_exit, OMPD_target_exit },
102     { OMPD_target, OMPD_update, OMPD_target_update },
103     { OMPD_target_enter, OMPD_data, OMPD_target_enter_data },
104     { OMPD_target_exit, OMPD_data, OMPD_target_exit_data },
105     { OMPD_for, OMPD_simd, OMPD_for_simd },
106     { OMPD_parallel, OMPD_for, OMPD_parallel_for },
107     { OMPD_parallel_for, OMPD_simd, OMPD_parallel_for_simd },
108     { OMPD_parallel, OMPD_sections, OMPD_parallel_sections },
109     { OMPD_taskloop, OMPD_simd, OMPD_taskloop_simd },
110     { OMPD_target, OMPD_parallel, OMPD_target_parallel },
111     { OMPD_target, OMPD_simd, OMPD_target_simd },
112     { OMPD_target_parallel, OMPD_for, OMPD_target_parallel_for },
113     { OMPD_target_parallel_for, OMPD_simd, OMPD_target_parallel_for_simd },
114     { OMPD_teams, OMPD_distribute, OMPD_teams_distribute },
115     { OMPD_teams_distribute, OMPD_simd, OMPD_teams_distribute_simd },
116     { OMPD_teams_distribute, OMPD_parallel, OMPD_teams_distribute_parallel },
117     { OMPD_teams_distribute_parallel, OMPD_for, OMPD_teams_distribute_parallel_for },
118     { OMPD_teams_distribute_parallel_for, OMPD_simd, OMPD_teams_distribute_parallel_for_simd },
119     { OMPD_target, OMPD_teams, OMPD_target_teams },
120     { OMPD_target_teams, OMPD_distribute, OMPD_target_teams_distribute },
121     { OMPD_target_teams_distribute, OMPD_parallel, OMPD_target_teams_distribute_parallel },
122     { OMPD_target_teams_distribute, OMPD_simd, OMPD_target_teams_distribute_simd },
123     { OMPD_target_teams_distribute_parallel, OMPD_for, OMPD_target_teams_distribute_parallel_for },
124     { OMPD_target_teams_distribute_parallel_for, OMPD_simd, OMPD_target_teams_distribute_parallel_for_simd }
125   };
126   enum { CancellationPoint = 0, DeclareReduction = 1, TargetData = 2 };
127   auto Tok = P.getCurToken();
128   unsigned DKind =
129       Tok.isAnnotation()
130           ? static_cast<unsigned>(OMPD_unknown)
131           : getOpenMPDirectiveKindEx(P.getPreprocessor().getSpelling(Tok));
132   if (DKind == OMPD_unknown)
133     return OMPD_unknown;
134 
135   for (unsigned i = 0; i < llvm::array_lengthof(F); ++i) {
136     if (DKind != F[i][0])
137       continue;
138 
139     Tok = P.getPreprocessor().LookAhead(0);
140     unsigned SDKind =
141         Tok.isAnnotation()
142             ? static_cast<unsigned>(OMPD_unknown)
143             : getOpenMPDirectiveKindEx(P.getPreprocessor().getSpelling(Tok));
144     if (SDKind == OMPD_unknown)
145       continue;
146 
147     if (SDKind == F[i][1]) {
148       P.ConsumeToken();
149       DKind = F[i][2];
150     }
151   }
152   return DKind < OMPD_unknown ? static_cast<OpenMPDirectiveKind>(DKind)
153                               : OMPD_unknown;
154 }
155 
156 static DeclarationName parseOpenMPReductionId(Parser &P) {
157   Token Tok = P.getCurToken();
158   Sema &Actions = P.getActions();
159   OverloadedOperatorKind OOK = OO_None;
160   // Allow to use 'operator' keyword for C++ operators
161   bool WithOperator = false;
162   if (Tok.is(tok::kw_operator)) {
163     P.ConsumeToken();
164     Tok = P.getCurToken();
165     WithOperator = true;
166   }
167   switch (Tok.getKind()) {
168   case tok::plus: // '+'
169     OOK = OO_Plus;
170     break;
171   case tok::minus: // '-'
172     OOK = OO_Minus;
173     break;
174   case tok::star: // '*'
175     OOK = OO_Star;
176     break;
177   case tok::amp: // '&'
178     OOK = OO_Amp;
179     break;
180   case tok::pipe: // '|'
181     OOK = OO_Pipe;
182     break;
183   case tok::caret: // '^'
184     OOK = OO_Caret;
185     break;
186   case tok::ampamp: // '&&'
187     OOK = OO_AmpAmp;
188     break;
189   case tok::pipepipe: // '||'
190     OOK = OO_PipePipe;
191     break;
192   case tok::identifier: // identifier
193     if (!WithOperator)
194       break;
195   default:
196     P.Diag(Tok.getLocation(), diag::err_omp_expected_reduction_identifier);
197     P.SkipUntil(tok::colon, tok::r_paren, tok::annot_pragma_openmp_end,
198                 Parser::StopBeforeMatch);
199     return DeclarationName();
200   }
201   P.ConsumeToken();
202   auto &DeclNames = Actions.getASTContext().DeclarationNames;
203   return OOK == OO_None ? DeclNames.getIdentifier(Tok.getIdentifierInfo())
204                         : DeclNames.getCXXOperatorName(OOK);
205 }
206 
207 /// \brief Parse 'omp declare reduction' construct.
208 ///
209 ///       declare-reduction-directive:
210 ///        annot_pragma_openmp 'declare' 'reduction'
211 ///        '(' <reduction_id> ':' <type> {',' <type>} ':' <expression> ')'
212 ///        ['initializer' '(' ('omp_priv' '=' <expression>)|<function_call> ')']
213 ///        annot_pragma_openmp_end
214 /// <reduction_id> is either a base language identifier or one of the following
215 /// operators: '+', '-', '*', '&', '|', '^', '&&' and '||'.
216 ///
217 Parser::DeclGroupPtrTy
218 Parser::ParseOpenMPDeclareReductionDirective(AccessSpecifier AS) {
219   // Parse '('.
220   BalancedDelimiterTracker T(*this, tok::l_paren, tok::annot_pragma_openmp_end);
221   if (T.expectAndConsume(diag::err_expected_lparen_after,
222                          getOpenMPDirectiveName(OMPD_declare_reduction))) {
223     SkipUntil(tok::annot_pragma_openmp_end, StopBeforeMatch);
224     return DeclGroupPtrTy();
225   }
226 
227   DeclarationName Name = parseOpenMPReductionId(*this);
228   if (Name.isEmpty() && Tok.is(tok::annot_pragma_openmp_end))
229     return DeclGroupPtrTy();
230 
231   // Consume ':'.
232   bool IsCorrect = !ExpectAndConsume(tok::colon);
233 
234   if (!IsCorrect && Tok.is(tok::annot_pragma_openmp_end))
235     return DeclGroupPtrTy();
236 
237   IsCorrect = IsCorrect && !Name.isEmpty();
238 
239   if (Tok.is(tok::colon) || Tok.is(tok::annot_pragma_openmp_end)) {
240     Diag(Tok.getLocation(), diag::err_expected_type);
241     IsCorrect = false;
242   }
243 
244   if (!IsCorrect && Tok.is(tok::annot_pragma_openmp_end))
245     return DeclGroupPtrTy();
246 
247   SmallVector<std::pair<QualType, SourceLocation>, 8> ReductionTypes;
248   // Parse list of types until ':' token.
249   do {
250     ColonProtectionRAIIObject ColonRAII(*this);
251     SourceRange Range;
252     TypeResult TR = ParseTypeName(&Range, Declarator::PrototypeContext, AS);
253     if (TR.isUsable()) {
254       auto ReductionType =
255           Actions.ActOnOpenMPDeclareReductionType(Range.getBegin(), TR);
256       if (!ReductionType.isNull()) {
257         ReductionTypes.push_back(
258             std::make_pair(ReductionType, Range.getBegin()));
259       }
260     } else {
261       SkipUntil(tok::comma, tok::colon, tok::annot_pragma_openmp_end,
262                 StopBeforeMatch);
263     }
264 
265     if (Tok.is(tok::colon) || Tok.is(tok::annot_pragma_openmp_end))
266       break;
267 
268     // Consume ','.
269     if (ExpectAndConsume(tok::comma)) {
270       IsCorrect = false;
271       if (Tok.is(tok::annot_pragma_openmp_end)) {
272         Diag(Tok.getLocation(), diag::err_expected_type);
273         return DeclGroupPtrTy();
274       }
275     }
276   } while (Tok.isNot(tok::annot_pragma_openmp_end));
277 
278   if (ReductionTypes.empty()) {
279     SkipUntil(tok::annot_pragma_openmp_end, StopBeforeMatch);
280     return DeclGroupPtrTy();
281   }
282 
283   if (!IsCorrect && Tok.is(tok::annot_pragma_openmp_end))
284     return DeclGroupPtrTy();
285 
286   // Consume ':'.
287   if (ExpectAndConsume(tok::colon))
288     IsCorrect = false;
289 
290   if (Tok.is(tok::annot_pragma_openmp_end)) {
291     Diag(Tok.getLocation(), diag::err_expected_expression);
292     return DeclGroupPtrTy();
293   }
294 
295   DeclGroupPtrTy DRD = Actions.ActOnOpenMPDeclareReductionDirectiveStart(
296       getCurScope(), Actions.getCurLexicalContext(), Name, ReductionTypes, AS);
297 
298   // Parse <combiner> expression and then parse initializer if any for each
299   // correct type.
300   unsigned I = 0, E = ReductionTypes.size();
301   for (auto *D : DRD.get()) {
302     TentativeParsingAction TPA(*this);
303     ParseScope OMPDRScope(this, Scope::FnScope | Scope::DeclScope |
304                                     Scope::OpenMPDirectiveScope);
305     // Parse <combiner> expression.
306     Actions.ActOnOpenMPDeclareReductionCombinerStart(getCurScope(), D);
307     ExprResult CombinerResult =
308         Actions.ActOnFinishFullExpr(ParseAssignmentExpression().get(),
309                                     D->getLocation(), /*DiscardedValue=*/true);
310     Actions.ActOnOpenMPDeclareReductionCombinerEnd(D, CombinerResult.get());
311 
312     if (CombinerResult.isInvalid() && Tok.isNot(tok::r_paren) &&
313         Tok.isNot(tok::annot_pragma_openmp_end)) {
314       TPA.Commit();
315       IsCorrect = false;
316       break;
317     }
318     IsCorrect = !T.consumeClose() && IsCorrect && CombinerResult.isUsable();
319     ExprResult InitializerResult;
320     if (Tok.isNot(tok::annot_pragma_openmp_end)) {
321       // Parse <initializer> expression.
322       if (Tok.is(tok::identifier) &&
323           Tok.getIdentifierInfo()->isStr("initializer"))
324         ConsumeToken();
325       else {
326         Diag(Tok.getLocation(), diag::err_expected) << "'initializer'";
327         TPA.Commit();
328         IsCorrect = false;
329         break;
330       }
331       // Parse '('.
332       BalancedDelimiterTracker T(*this, tok::l_paren,
333                                  tok::annot_pragma_openmp_end);
334       IsCorrect =
335           !T.expectAndConsume(diag::err_expected_lparen_after, "initializer") &&
336           IsCorrect;
337       if (Tok.isNot(tok::annot_pragma_openmp_end)) {
338         ParseScope OMPDRScope(this, Scope::FnScope | Scope::DeclScope |
339                                         Scope::OpenMPDirectiveScope);
340         // Parse expression.
341         Actions.ActOnOpenMPDeclareReductionInitializerStart(getCurScope(), D);
342         InitializerResult = Actions.ActOnFinishFullExpr(
343             ParseAssignmentExpression().get(), D->getLocation(),
344             /*DiscardedValue=*/true);
345         Actions.ActOnOpenMPDeclareReductionInitializerEnd(
346             D, InitializerResult.get());
347         if (InitializerResult.isInvalid() && Tok.isNot(tok::r_paren) &&
348             Tok.isNot(tok::annot_pragma_openmp_end)) {
349           TPA.Commit();
350           IsCorrect = false;
351           break;
352         }
353         IsCorrect =
354             !T.consumeClose() && IsCorrect && !InitializerResult.isInvalid();
355       }
356     }
357 
358     ++I;
359     // Revert parsing if not the last type, otherwise accept it, we're done with
360     // parsing.
361     if (I != E)
362       TPA.Revert();
363     else
364       TPA.Commit();
365   }
366   return Actions.ActOnOpenMPDeclareReductionDirectiveEnd(getCurScope(), DRD,
367                                                          IsCorrect);
368 }
369 
370 namespace {
371 /// RAII that recreates function context for correct parsing of clauses of
372 /// 'declare simd' construct.
373 /// OpenMP, 2.8.2 declare simd Construct
374 /// The expressions appearing in the clauses of this directive are evaluated in
375 /// the scope of the arguments of the function declaration or definition.
376 class FNContextRAII final {
377   Parser &P;
378   Sema::CXXThisScopeRAII *ThisScope;
379   Parser::ParseScope *TempScope;
380   Parser::ParseScope *FnScope;
381   bool HasTemplateScope = false;
382   bool HasFunScope = false;
383   FNContextRAII() = delete;
384   FNContextRAII(const FNContextRAII &) = delete;
385   FNContextRAII &operator=(const FNContextRAII &) = delete;
386 
387 public:
388   FNContextRAII(Parser &P, Parser::DeclGroupPtrTy Ptr) : P(P) {
389     Decl *D = *Ptr.get().begin();
390     NamedDecl *ND = dyn_cast<NamedDecl>(D);
391     RecordDecl *RD = dyn_cast_or_null<RecordDecl>(D->getDeclContext());
392     Sema &Actions = P.getActions();
393 
394     // Allow 'this' within late-parsed attributes.
395     ThisScope = new Sema::CXXThisScopeRAII(Actions, RD, /*TypeQuals=*/0,
396                                            ND && ND->isCXXInstanceMember());
397 
398     // If the Decl is templatized, add template parameters to scope.
399     HasTemplateScope = D->isTemplateDecl();
400     TempScope =
401         new Parser::ParseScope(&P, Scope::TemplateParamScope, HasTemplateScope);
402     if (HasTemplateScope)
403       Actions.ActOnReenterTemplateScope(Actions.getCurScope(), D);
404 
405     // If the Decl is on a function, add function parameters to the scope.
406     HasFunScope = D->isFunctionOrFunctionTemplate();
407     FnScope = new Parser::ParseScope(&P, Scope::FnScope | Scope::DeclScope,
408                                      HasFunScope);
409     if (HasFunScope)
410       Actions.ActOnReenterFunctionContext(Actions.getCurScope(), D);
411   }
412   ~FNContextRAII() {
413     if (HasFunScope) {
414       P.getActions().ActOnExitFunctionContext();
415       FnScope->Exit(); // Pop scope, and remove Decls from IdResolver
416     }
417     if (HasTemplateScope)
418       TempScope->Exit();
419     delete FnScope;
420     delete TempScope;
421     delete ThisScope;
422   }
423 };
424 } // namespace
425 
426 /// Parses clauses for 'declare simd' directive.
427 ///    clause:
428 ///      'inbranch' | 'notinbranch'
429 ///      'simdlen' '(' <expr> ')'
430 ///      { 'uniform' '(' <argument_list> ')' }
431 ///      { 'aligned '(' <argument_list> [ ':' <alignment> ] ')' }
432 ///      { 'linear '(' <argument_list> [ ':' <step> ] ')' }
433 static bool parseDeclareSimdClauses(
434     Parser &P, OMPDeclareSimdDeclAttr::BranchStateTy &BS, ExprResult &SimdLen,
435     SmallVectorImpl<Expr *> &Uniforms, SmallVectorImpl<Expr *> &Aligneds,
436     SmallVectorImpl<Expr *> &Alignments, SmallVectorImpl<Expr *> &Linears,
437     SmallVectorImpl<unsigned> &LinModifiers, SmallVectorImpl<Expr *> &Steps) {
438   SourceRange BSRange;
439   const Token &Tok = P.getCurToken();
440   bool IsError = false;
441   while (Tok.isNot(tok::annot_pragma_openmp_end)) {
442     if (Tok.isNot(tok::identifier))
443       break;
444     OMPDeclareSimdDeclAttr::BranchStateTy Out;
445     IdentifierInfo *II = Tok.getIdentifierInfo();
446     StringRef ClauseName = II->getName();
447     // Parse 'inranch|notinbranch' clauses.
448     if (OMPDeclareSimdDeclAttr::ConvertStrToBranchStateTy(ClauseName, Out)) {
449       if (BS != OMPDeclareSimdDeclAttr::BS_Undefined && BS != Out) {
450         P.Diag(Tok, diag::err_omp_declare_simd_inbranch_notinbranch)
451             << ClauseName
452             << OMPDeclareSimdDeclAttr::ConvertBranchStateTyToStr(BS) << BSRange;
453         IsError = true;
454       }
455       BS = Out;
456       BSRange = SourceRange(Tok.getLocation(), Tok.getEndLoc());
457       P.ConsumeToken();
458     } else if (ClauseName.equals("simdlen")) {
459       if (SimdLen.isUsable()) {
460         P.Diag(Tok, diag::err_omp_more_one_clause)
461             << getOpenMPDirectiveName(OMPD_declare_simd) << ClauseName << 0;
462         IsError = true;
463       }
464       P.ConsumeToken();
465       SourceLocation RLoc;
466       SimdLen = P.ParseOpenMPParensExpr(ClauseName, RLoc);
467       if (SimdLen.isInvalid())
468         IsError = true;
469     } else {
470       OpenMPClauseKind CKind = getOpenMPClauseKind(ClauseName);
471       if (CKind == OMPC_uniform || CKind == OMPC_aligned ||
472           CKind == OMPC_linear) {
473         Parser::OpenMPVarListDataTy Data;
474         auto *Vars = &Uniforms;
475         if (CKind == OMPC_aligned)
476           Vars = &Aligneds;
477         else if (CKind == OMPC_linear)
478           Vars = &Linears;
479 
480         P.ConsumeToken();
481         if (P.ParseOpenMPVarList(OMPD_declare_simd,
482                                  getOpenMPClauseKind(ClauseName), *Vars, Data))
483           IsError = true;
484         if (CKind == OMPC_aligned)
485           Alignments.append(Aligneds.size() - Alignments.size(), Data.TailExpr);
486         else if (CKind == OMPC_linear) {
487           if (P.getActions().CheckOpenMPLinearModifier(Data.LinKind,
488                                                        Data.DepLinMapLoc))
489             Data.LinKind = OMPC_LINEAR_val;
490           LinModifiers.append(Linears.size() - LinModifiers.size(),
491                               Data.LinKind);
492           Steps.append(Linears.size() - Steps.size(), Data.TailExpr);
493         }
494       } else
495         // TODO: add parsing of other clauses.
496         break;
497     }
498     // Skip ',' if any.
499     if (Tok.is(tok::comma))
500       P.ConsumeToken();
501   }
502   return IsError;
503 }
504 
505 /// Parse clauses for '#pragma omp declare simd'.
506 Parser::DeclGroupPtrTy
507 Parser::ParseOMPDeclareSimdClauses(Parser::DeclGroupPtrTy Ptr,
508                                    CachedTokens &Toks, SourceLocation Loc) {
509   PP.EnterToken(Tok);
510   PP.EnterTokenStream(Toks, /*DisableMacroExpansion=*/true);
511   // Consume the previously pushed token.
512   ConsumeAnyToken(/*ConsumeCodeCompletionTok=*/true);
513 
514   FNContextRAII FnContext(*this, Ptr);
515   OMPDeclareSimdDeclAttr::BranchStateTy BS =
516       OMPDeclareSimdDeclAttr::BS_Undefined;
517   ExprResult Simdlen;
518   SmallVector<Expr *, 4> Uniforms;
519   SmallVector<Expr *, 4> Aligneds;
520   SmallVector<Expr *, 4> Alignments;
521   SmallVector<Expr *, 4> Linears;
522   SmallVector<unsigned, 4> LinModifiers;
523   SmallVector<Expr *, 4> Steps;
524   bool IsError =
525       parseDeclareSimdClauses(*this, BS, Simdlen, Uniforms, Aligneds,
526                               Alignments, Linears, LinModifiers, Steps);
527   // Need to check for extra tokens.
528   if (Tok.isNot(tok::annot_pragma_openmp_end)) {
529     Diag(Tok, diag::warn_omp_extra_tokens_at_eol)
530         << getOpenMPDirectiveName(OMPD_declare_simd);
531     while (Tok.isNot(tok::annot_pragma_openmp_end))
532       ConsumeAnyToken();
533   }
534   // Skip the last annot_pragma_openmp_end.
535   SourceLocation EndLoc = ConsumeToken();
536   if (!IsError) {
537     return Actions.ActOnOpenMPDeclareSimdDirective(
538         Ptr, BS, Simdlen.get(), Uniforms, Aligneds, Alignments, Linears,
539         LinModifiers, Steps, SourceRange(Loc, EndLoc));
540   }
541   return Ptr;
542 }
543 
544 /// \brief Parsing of declarative OpenMP directives.
545 ///
546 ///       threadprivate-directive:
547 ///         annot_pragma_openmp 'threadprivate' simple-variable-list
548 ///         annot_pragma_openmp_end
549 ///
550 ///       declare-reduction-directive:
551 ///        annot_pragma_openmp 'declare' 'reduction' [...]
552 ///        annot_pragma_openmp_end
553 ///
554 ///       declare-simd-directive:
555 ///         annot_pragma_openmp 'declare simd' {<clause> [,]}
556 ///         annot_pragma_openmp_end
557 ///         <function declaration/definition>
558 ///
559 Parser::DeclGroupPtrTy Parser::ParseOpenMPDeclarativeDirectiveWithExtDecl(
560     AccessSpecifier &AS, ParsedAttributesWithRange &Attrs,
561     DeclSpec::TST TagType, Decl *Tag) {
562   assert(Tok.is(tok::annot_pragma_openmp) && "Not an OpenMP directive!");
563   ParenBraceBracketBalancer BalancerRAIIObj(*this);
564 
565   SourceLocation Loc = ConsumeToken();
566   auto DKind = ParseOpenMPDirectiveKind(*this);
567 
568   switch (DKind) {
569   case OMPD_threadprivate: {
570     ConsumeToken();
571     ThreadprivateListParserHelper Helper(this);
572     if (!ParseOpenMPSimpleVarList(OMPD_threadprivate, Helper, true)) {
573       // The last seen token is annot_pragma_openmp_end - need to check for
574       // extra tokens.
575       if (Tok.isNot(tok::annot_pragma_openmp_end)) {
576         Diag(Tok, diag::warn_omp_extra_tokens_at_eol)
577             << getOpenMPDirectiveName(OMPD_threadprivate);
578         SkipUntil(tok::annot_pragma_openmp_end, StopBeforeMatch);
579       }
580       // Skip the last annot_pragma_openmp_end.
581       ConsumeToken();
582       return Actions.ActOnOpenMPThreadprivateDirective(Loc,
583                                                        Helper.getIdentifiers());
584     }
585     break;
586   }
587   case OMPD_declare_reduction:
588     ConsumeToken();
589     if (auto Res = ParseOpenMPDeclareReductionDirective(AS)) {
590       // The last seen token is annot_pragma_openmp_end - need to check for
591       // extra tokens.
592       if (Tok.isNot(tok::annot_pragma_openmp_end)) {
593         Diag(Tok, diag::warn_omp_extra_tokens_at_eol)
594             << getOpenMPDirectiveName(OMPD_declare_reduction);
595         while (Tok.isNot(tok::annot_pragma_openmp_end))
596           ConsumeAnyToken();
597       }
598       // Skip the last annot_pragma_openmp_end.
599       ConsumeToken();
600       return Res;
601     }
602     break;
603   case OMPD_declare_simd: {
604     // The syntax is:
605     // { #pragma omp declare simd }
606     // <function-declaration-or-definition>
607     //
608     ConsumeToken();
609     CachedTokens Toks;
610     while(Tok.isNot(tok::annot_pragma_openmp_end)) {
611       Toks.push_back(Tok);
612       ConsumeAnyToken();
613     }
614     Toks.push_back(Tok);
615     ConsumeAnyToken();
616 
617     DeclGroupPtrTy Ptr;
618     if (Tok.is(tok::annot_pragma_openmp))
619       Ptr = ParseOpenMPDeclarativeDirectiveWithExtDecl(AS, Attrs, TagType, Tag);
620     else if (Tok.isNot(tok::r_brace) && !isEofOrEom()) {
621       // Here we expect to see some function declaration.
622       if (AS == AS_none) {
623         assert(TagType == DeclSpec::TST_unspecified);
624         MaybeParseCXX11Attributes(Attrs);
625         ParsingDeclSpec PDS(*this);
626         Ptr = ParseExternalDeclaration(Attrs, &PDS);
627       } else {
628         Ptr =
629             ParseCXXClassMemberDeclarationWithPragmas(AS, Attrs, TagType, Tag);
630       }
631     }
632     if (!Ptr) {
633       Diag(Loc, diag::err_omp_decl_in_declare_simd);
634       return DeclGroupPtrTy();
635     }
636     return ParseOMPDeclareSimdClauses(Ptr, Toks, Loc);
637   }
638   case OMPD_declare_target: {
639     SourceLocation DTLoc = ConsumeAnyToken();
640     if (Tok.isNot(tok::annot_pragma_openmp_end)) {
641       // OpenMP 4.5 syntax with list of entities.
642       llvm::SmallSetVector<const NamedDecl*, 16> SameDirectiveDecls;
643       while (Tok.isNot(tok::annot_pragma_openmp_end)) {
644         OMPDeclareTargetDeclAttr::MapTypeTy MT =
645             OMPDeclareTargetDeclAttr::MT_To;
646         if (Tok.is(tok::identifier)) {
647           IdentifierInfo *II = Tok.getIdentifierInfo();
648           StringRef ClauseName = II->getName();
649           // Parse 'to|link' clauses.
650           if (!OMPDeclareTargetDeclAttr::ConvertStrToMapTypeTy(ClauseName,
651                                                                MT)) {
652             Diag(Tok, diag::err_omp_declare_target_unexpected_clause)
653                 << ClauseName;
654             break;
655           }
656           ConsumeToken();
657         }
658         auto Callback = [this, MT, &SameDirectiveDecls](
659             CXXScopeSpec &SS, DeclarationNameInfo NameInfo) {
660           Actions.ActOnOpenMPDeclareTargetName(getCurScope(), SS, NameInfo, MT,
661                                                SameDirectiveDecls);
662         };
663         if (ParseOpenMPSimpleVarList(OMPD_declare_target, Callback, true))
664           break;
665 
666         // Consume optional ','.
667         if (Tok.is(tok::comma))
668           ConsumeToken();
669       }
670       SkipUntil(tok::annot_pragma_openmp_end, StopBeforeMatch);
671       ConsumeAnyToken();
672       return DeclGroupPtrTy();
673     }
674 
675     // Skip the last annot_pragma_openmp_end.
676     ConsumeAnyToken();
677 
678     if (!Actions.ActOnStartOpenMPDeclareTargetDirective(DTLoc))
679       return DeclGroupPtrTy();
680 
681     DKind = ParseOpenMPDirectiveKind(*this);
682     while (DKind != OMPD_end_declare_target && DKind != OMPD_declare_target &&
683            Tok.isNot(tok::eof) && Tok.isNot(tok::r_brace)) {
684       ParsedAttributesWithRange attrs(AttrFactory);
685       MaybeParseCXX11Attributes(attrs);
686       ParseExternalDeclaration(attrs);
687       if (Tok.isAnnotation() && Tok.is(tok::annot_pragma_openmp)) {
688         TentativeParsingAction TPA(*this);
689         ConsumeToken();
690         DKind = ParseOpenMPDirectiveKind(*this);
691         if (DKind != OMPD_end_declare_target)
692           TPA.Revert();
693         else
694           TPA.Commit();
695       }
696     }
697 
698     if (DKind == OMPD_end_declare_target) {
699       ConsumeAnyToken();
700       if (Tok.isNot(tok::annot_pragma_openmp_end)) {
701         Diag(Tok, diag::warn_omp_extra_tokens_at_eol)
702             << getOpenMPDirectiveName(OMPD_end_declare_target);
703         SkipUntil(tok::annot_pragma_openmp_end, StopBeforeMatch);
704       }
705       // Skip the last annot_pragma_openmp_end.
706       ConsumeAnyToken();
707     } else {
708       Diag(Tok, diag::err_expected_end_declare_target);
709       Diag(DTLoc, diag::note_matching) << "'#pragma omp declare target'";
710     }
711     Actions.ActOnFinishOpenMPDeclareTargetDirective();
712     return DeclGroupPtrTy();
713   }
714   case OMPD_unknown:
715     Diag(Tok, diag::err_omp_unknown_directive);
716     break;
717   case OMPD_parallel:
718   case OMPD_simd:
719   case OMPD_task:
720   case OMPD_taskyield:
721   case OMPD_barrier:
722   case OMPD_taskwait:
723   case OMPD_taskgroup:
724   case OMPD_flush:
725   case OMPD_for:
726   case OMPD_for_simd:
727   case OMPD_sections:
728   case OMPD_section:
729   case OMPD_single:
730   case OMPD_master:
731   case OMPD_ordered:
732   case OMPD_critical:
733   case OMPD_parallel_for:
734   case OMPD_parallel_for_simd:
735   case OMPD_parallel_sections:
736   case OMPD_atomic:
737   case OMPD_target:
738   case OMPD_teams:
739   case OMPD_cancellation_point:
740   case OMPD_cancel:
741   case OMPD_target_data:
742   case OMPD_target_enter_data:
743   case OMPD_target_exit_data:
744   case OMPD_target_parallel:
745   case OMPD_target_parallel_for:
746   case OMPD_taskloop:
747   case OMPD_taskloop_simd:
748   case OMPD_distribute:
749   case OMPD_end_declare_target:
750   case OMPD_target_update:
751   case OMPD_distribute_parallel_for:
752   case OMPD_distribute_parallel_for_simd:
753   case OMPD_distribute_simd:
754   case OMPD_target_parallel_for_simd:
755   case OMPD_target_simd:
756   case OMPD_teams_distribute:
757   case OMPD_teams_distribute_simd:
758   case OMPD_teams_distribute_parallel_for_simd:
759   case OMPD_teams_distribute_parallel_for:
760   case OMPD_target_teams:
761   case OMPD_target_teams_distribute:
762   case OMPD_target_teams_distribute_parallel_for:
763   case OMPD_target_teams_distribute_parallel_for_simd:
764   case OMPD_target_teams_distribute_simd:
765     Diag(Tok, diag::err_omp_unexpected_directive)
766         << getOpenMPDirectiveName(DKind);
767     break;
768   }
769   while (Tok.isNot(tok::annot_pragma_openmp_end))
770     ConsumeAnyToken();
771   ConsumeAnyToken();
772   return nullptr;
773 }
774 
775 /// \brief Parsing of declarative or executable OpenMP directives.
776 ///
777 ///       threadprivate-directive:
778 ///         annot_pragma_openmp 'threadprivate' simple-variable-list
779 ///         annot_pragma_openmp_end
780 ///
781 ///       declare-reduction-directive:
782 ///         annot_pragma_openmp 'declare' 'reduction' '(' <reduction_id> ':'
783 ///         <type> {',' <type>} ':' <expression> ')' ['initializer' '('
784 ///         ('omp_priv' '=' <expression>|<function_call>) ')']
785 ///         annot_pragma_openmp_end
786 ///
787 ///       executable-directive:
788 ///         annot_pragma_openmp 'parallel' | 'simd' | 'for' | 'sections' |
789 ///         'section' | 'single' | 'master' | 'critical' [ '(' <name> ')' ] |
790 ///         'parallel for' | 'parallel sections' | 'task' | 'taskyield' |
791 ///         'barrier' | 'taskwait' | 'flush' | 'ordered' | 'atomic' |
792 ///         'for simd' | 'parallel for simd' | 'target' | 'target data' |
793 ///         'taskgroup' | 'teams' | 'taskloop' | 'taskloop simd' |
794 ///         'distribute' | 'target enter data' | 'target exit data' |
795 ///         'target parallel' | 'target parallel for' |
796 ///         'target update' | 'distribute parallel for' |
797 ///         'distribute paralle for simd' | 'distribute simd' |
798 ///         'target parallel for simd' | 'target simd' |
799 ///         'teams distribute' | 'teams distribute simd' |
800 ///         'teams distribute parallel for simd' |
801 ///         'teams distribute parallel for' | 'target teams' |
802 ///         'target teams distribute' |
803 ///         'target teams distribute parallel for' |
804 ///         'target teams distribute parallel for simd' |
805 ///         'target teams distribute simd' {clause}
806 ///         annot_pragma_openmp_end
807 ///
808 StmtResult Parser::ParseOpenMPDeclarativeOrExecutableDirective(
809     AllowedContsructsKind Allowed) {
810   assert(Tok.is(tok::annot_pragma_openmp) && "Not an OpenMP directive!");
811   ParenBraceBracketBalancer BalancerRAIIObj(*this);
812   SmallVector<OMPClause *, 5> Clauses;
813   SmallVector<llvm::PointerIntPair<OMPClause *, 1, bool>, OMPC_unknown + 1>
814   FirstClauses(OMPC_unknown + 1);
815   unsigned ScopeFlags =
816       Scope::FnScope | Scope::DeclScope | Scope::OpenMPDirectiveScope;
817   SourceLocation Loc = ConsumeToken(), EndLoc;
818   auto DKind = ParseOpenMPDirectiveKind(*this);
819   OpenMPDirectiveKind CancelRegion = OMPD_unknown;
820   // Name of critical directive.
821   DeclarationNameInfo DirName;
822   StmtResult Directive = StmtError();
823   bool HasAssociatedStatement = true;
824   bool FlushHasClause = false;
825 
826   switch (DKind) {
827   case OMPD_threadprivate: {
828     if (Allowed != ACK_Any) {
829       Diag(Tok, diag::err_omp_immediate_directive)
830           << getOpenMPDirectiveName(DKind) << 0;
831     }
832     ConsumeToken();
833     ThreadprivateListParserHelper Helper(this);
834     if (!ParseOpenMPSimpleVarList(OMPD_threadprivate, Helper, false)) {
835       // The last seen token is annot_pragma_openmp_end - need to check for
836       // extra tokens.
837       if (Tok.isNot(tok::annot_pragma_openmp_end)) {
838         Diag(Tok, diag::warn_omp_extra_tokens_at_eol)
839             << getOpenMPDirectiveName(OMPD_threadprivate);
840         SkipUntil(tok::annot_pragma_openmp_end, StopBeforeMatch);
841       }
842       DeclGroupPtrTy Res = Actions.ActOnOpenMPThreadprivateDirective(
843           Loc, Helper.getIdentifiers());
844       Directive = Actions.ActOnDeclStmt(Res, Loc, Tok.getLocation());
845     }
846     SkipUntil(tok::annot_pragma_openmp_end);
847     break;
848   }
849   case OMPD_declare_reduction:
850     ConsumeToken();
851     if (auto Res = ParseOpenMPDeclareReductionDirective(/*AS=*/AS_none)) {
852       // The last seen token is annot_pragma_openmp_end - need to check for
853       // extra tokens.
854       if (Tok.isNot(tok::annot_pragma_openmp_end)) {
855         Diag(Tok, diag::warn_omp_extra_tokens_at_eol)
856             << getOpenMPDirectiveName(OMPD_declare_reduction);
857         while (Tok.isNot(tok::annot_pragma_openmp_end))
858           ConsumeAnyToken();
859       }
860       ConsumeAnyToken();
861       Directive = Actions.ActOnDeclStmt(Res, Loc, Tok.getLocation());
862     } else
863       SkipUntil(tok::annot_pragma_openmp_end);
864     break;
865   case OMPD_flush:
866     if (PP.LookAhead(0).is(tok::l_paren)) {
867       FlushHasClause = true;
868       // Push copy of the current token back to stream to properly parse
869       // pseudo-clause OMPFlushClause.
870       PP.EnterToken(Tok);
871     }
872   case OMPD_taskyield:
873   case OMPD_barrier:
874   case OMPD_taskwait:
875   case OMPD_cancellation_point:
876   case OMPD_cancel:
877   case OMPD_target_enter_data:
878   case OMPD_target_exit_data:
879   case OMPD_target_update:
880     if (Allowed == ACK_StatementsOpenMPNonStandalone) {
881       Diag(Tok, diag::err_omp_immediate_directive)
882           << getOpenMPDirectiveName(DKind) << 0;
883     }
884     HasAssociatedStatement = false;
885     // Fall through for further analysis.
886   case OMPD_parallel:
887   case OMPD_simd:
888   case OMPD_for:
889   case OMPD_for_simd:
890   case OMPD_sections:
891   case OMPD_single:
892   case OMPD_section:
893   case OMPD_master:
894   case OMPD_critical:
895   case OMPD_parallel_for:
896   case OMPD_parallel_for_simd:
897   case OMPD_parallel_sections:
898   case OMPD_task:
899   case OMPD_ordered:
900   case OMPD_atomic:
901   case OMPD_target:
902   case OMPD_teams:
903   case OMPD_taskgroup:
904   case OMPD_target_data:
905   case OMPD_target_parallel:
906   case OMPD_target_parallel_for:
907   case OMPD_taskloop:
908   case OMPD_taskloop_simd:
909   case OMPD_distribute:
910   case OMPD_distribute_parallel_for:
911   case OMPD_distribute_parallel_for_simd:
912   case OMPD_distribute_simd:
913   case OMPD_target_parallel_for_simd:
914   case OMPD_target_simd:
915   case OMPD_teams_distribute:
916   case OMPD_teams_distribute_simd:
917   case OMPD_teams_distribute_parallel_for_simd:
918   case OMPD_teams_distribute_parallel_for:
919   case OMPD_target_teams:
920   case OMPD_target_teams_distribute:
921   case OMPD_target_teams_distribute_parallel_for:
922   case OMPD_target_teams_distribute_parallel_for_simd:
923   case OMPD_target_teams_distribute_simd: {
924     ConsumeToken();
925     // Parse directive name of the 'critical' directive if any.
926     if (DKind == OMPD_critical) {
927       BalancedDelimiterTracker T(*this, tok::l_paren,
928                                  tok::annot_pragma_openmp_end);
929       if (!T.consumeOpen()) {
930         if (Tok.isAnyIdentifier()) {
931           DirName =
932               DeclarationNameInfo(Tok.getIdentifierInfo(), Tok.getLocation());
933           ConsumeAnyToken();
934         } else {
935           Diag(Tok, diag::err_omp_expected_identifier_for_critical);
936         }
937         T.consumeClose();
938       }
939     } else if (DKind == OMPD_cancellation_point || DKind == OMPD_cancel) {
940       CancelRegion = ParseOpenMPDirectiveKind(*this);
941       if (Tok.isNot(tok::annot_pragma_openmp_end))
942         ConsumeToken();
943     }
944 
945     if (isOpenMPLoopDirective(DKind))
946       ScopeFlags |= Scope::OpenMPLoopDirectiveScope;
947     if (isOpenMPSimdDirective(DKind))
948       ScopeFlags |= Scope::OpenMPSimdDirectiveScope;
949     ParseScope OMPDirectiveScope(this, ScopeFlags);
950     Actions.StartOpenMPDSABlock(DKind, DirName, Actions.getCurScope(), Loc);
951 
952     while (Tok.isNot(tok::annot_pragma_openmp_end)) {
953       OpenMPClauseKind CKind =
954           Tok.isAnnotation()
955               ? OMPC_unknown
956               : FlushHasClause ? OMPC_flush
957                                : getOpenMPClauseKind(PP.getSpelling(Tok));
958       Actions.StartOpenMPClause(CKind);
959       FlushHasClause = false;
960       OMPClause *Clause =
961           ParseOpenMPClause(DKind, CKind, !FirstClauses[CKind].getInt());
962       FirstClauses[CKind].setInt(true);
963       if (Clause) {
964         FirstClauses[CKind].setPointer(Clause);
965         Clauses.push_back(Clause);
966       }
967 
968       // Skip ',' if any.
969       if (Tok.is(tok::comma))
970         ConsumeToken();
971       Actions.EndOpenMPClause();
972     }
973     // End location of the directive.
974     EndLoc = Tok.getLocation();
975     // Consume final annot_pragma_openmp_end.
976     ConsumeToken();
977 
978     // OpenMP [2.13.8, ordered Construct, Syntax]
979     // If the depend clause is specified, the ordered construct is a stand-alone
980     // directive.
981     if (DKind == OMPD_ordered && FirstClauses[OMPC_depend].getInt()) {
982       if (Allowed == ACK_StatementsOpenMPNonStandalone) {
983         Diag(Loc, diag::err_omp_immediate_directive)
984             << getOpenMPDirectiveName(DKind) << 1
985             << getOpenMPClauseName(OMPC_depend);
986       }
987       HasAssociatedStatement = false;
988     }
989 
990     StmtResult AssociatedStmt;
991     if (HasAssociatedStatement) {
992       // The body is a block scope like in Lambdas and Blocks.
993       Sema::CompoundScopeRAII CompoundScope(Actions);
994       Actions.ActOnOpenMPRegionStart(DKind, getCurScope());
995       Actions.ActOnStartOfCompoundStmt();
996       // Parse statement
997       AssociatedStmt = ParseStatement();
998       Actions.ActOnFinishOfCompoundStmt();
999       AssociatedStmt = Actions.ActOnOpenMPRegionEnd(AssociatedStmt, Clauses);
1000     }
1001     Directive = Actions.ActOnOpenMPExecutableDirective(
1002         DKind, DirName, CancelRegion, Clauses, AssociatedStmt.get(), Loc,
1003         EndLoc);
1004 
1005     // Exit scope.
1006     Actions.EndOpenMPDSABlock(Directive.get());
1007     OMPDirectiveScope.Exit();
1008     break;
1009   }
1010   case OMPD_declare_simd:
1011   case OMPD_declare_target:
1012   case OMPD_end_declare_target:
1013     Diag(Tok, diag::err_omp_unexpected_directive)
1014         << getOpenMPDirectiveName(DKind);
1015     SkipUntil(tok::annot_pragma_openmp_end);
1016     break;
1017   case OMPD_unknown:
1018     Diag(Tok, diag::err_omp_unknown_directive);
1019     SkipUntil(tok::annot_pragma_openmp_end);
1020     break;
1021   }
1022   return Directive;
1023 }
1024 
1025 // Parses simple list:
1026 //   simple-variable-list:
1027 //         '(' id-expression {, id-expression} ')'
1028 //
1029 bool Parser::ParseOpenMPSimpleVarList(
1030     OpenMPDirectiveKind Kind,
1031     const llvm::function_ref<void(CXXScopeSpec &, DeclarationNameInfo)> &
1032         Callback,
1033     bool AllowScopeSpecifier) {
1034   // Parse '('.
1035   BalancedDelimiterTracker T(*this, tok::l_paren, tok::annot_pragma_openmp_end);
1036   if (T.expectAndConsume(diag::err_expected_lparen_after,
1037                          getOpenMPDirectiveName(Kind)))
1038     return true;
1039   bool IsCorrect = true;
1040   bool NoIdentIsFound = true;
1041 
1042   // Read tokens while ')' or annot_pragma_openmp_end is not found.
1043   while (Tok.isNot(tok::r_paren) && Tok.isNot(tok::annot_pragma_openmp_end)) {
1044     CXXScopeSpec SS;
1045     SourceLocation TemplateKWLoc;
1046     UnqualifiedId Name;
1047     // Read var name.
1048     Token PrevTok = Tok;
1049     NoIdentIsFound = false;
1050 
1051     if (AllowScopeSpecifier && getLangOpts().CPlusPlus &&
1052         ParseOptionalCXXScopeSpecifier(SS, nullptr, false)) {
1053       IsCorrect = false;
1054       SkipUntil(tok::comma, tok::r_paren, tok::annot_pragma_openmp_end,
1055                 StopBeforeMatch);
1056     } else if (ParseUnqualifiedId(SS, false, false, false, nullptr,
1057                                   TemplateKWLoc, Name)) {
1058       IsCorrect = false;
1059       SkipUntil(tok::comma, tok::r_paren, tok::annot_pragma_openmp_end,
1060                 StopBeforeMatch);
1061     } else if (Tok.isNot(tok::comma) && Tok.isNot(tok::r_paren) &&
1062                Tok.isNot(tok::annot_pragma_openmp_end)) {
1063       IsCorrect = false;
1064       SkipUntil(tok::comma, tok::r_paren, tok::annot_pragma_openmp_end,
1065                 StopBeforeMatch);
1066       Diag(PrevTok.getLocation(), diag::err_expected)
1067           << tok::identifier
1068           << SourceRange(PrevTok.getLocation(), PrevTokLocation);
1069     } else {
1070       Callback(SS, Actions.GetNameFromUnqualifiedId(Name));
1071     }
1072     // Consume ','.
1073     if (Tok.is(tok::comma)) {
1074       ConsumeToken();
1075     }
1076   }
1077 
1078   if (NoIdentIsFound) {
1079     Diag(Tok, diag::err_expected) << tok::identifier;
1080     IsCorrect = false;
1081   }
1082 
1083   // Parse ')'.
1084   IsCorrect = !T.consumeClose() && IsCorrect;
1085 
1086   return !IsCorrect;
1087 }
1088 
1089 /// \brief Parsing of OpenMP clauses.
1090 ///
1091 ///    clause:
1092 ///       if-clause | final-clause | num_threads-clause | safelen-clause |
1093 ///       default-clause | private-clause | firstprivate-clause | shared-clause
1094 ///       | linear-clause | aligned-clause | collapse-clause |
1095 ///       lastprivate-clause | reduction-clause | proc_bind-clause |
1096 ///       schedule-clause | copyin-clause | copyprivate-clause | untied-clause |
1097 ///       mergeable-clause | flush-clause | read-clause | write-clause |
1098 ///       update-clause | capture-clause | seq_cst-clause | device-clause |
1099 ///       simdlen-clause | threads-clause | simd-clause | num_teams-clause |
1100 ///       thread_limit-clause | priority-clause | grainsize-clause |
1101 ///       nogroup-clause | num_tasks-clause | hint-clause | to-clause |
1102 ///       from-clause | is_device_ptr-clause
1103 ///
1104 OMPClause *Parser::ParseOpenMPClause(OpenMPDirectiveKind DKind,
1105                                      OpenMPClauseKind CKind, bool FirstClause) {
1106   OMPClause *Clause = nullptr;
1107   bool ErrorFound = false;
1108   // Check if clause is allowed for the given directive.
1109   if (CKind != OMPC_unknown && !isAllowedClauseForDirective(DKind, CKind)) {
1110     Diag(Tok, diag::err_omp_unexpected_clause) << getOpenMPClauseName(CKind)
1111                                                << getOpenMPDirectiveName(DKind);
1112     ErrorFound = true;
1113   }
1114 
1115   switch (CKind) {
1116   case OMPC_final:
1117   case OMPC_num_threads:
1118   case OMPC_safelen:
1119   case OMPC_simdlen:
1120   case OMPC_collapse:
1121   case OMPC_ordered:
1122   case OMPC_device:
1123   case OMPC_num_teams:
1124   case OMPC_thread_limit:
1125   case OMPC_priority:
1126   case OMPC_grainsize:
1127   case OMPC_num_tasks:
1128   case OMPC_hint:
1129     // OpenMP [2.5, Restrictions]
1130     //  At most one num_threads clause can appear on the directive.
1131     // OpenMP [2.8.1, simd construct, Restrictions]
1132     //  Only one safelen  clause can appear on a simd directive.
1133     //  Only one simdlen  clause can appear on a simd directive.
1134     //  Only one collapse clause can appear on a simd directive.
1135     // OpenMP [2.9.1, target data construct, Restrictions]
1136     //  At most one device clause can appear on the directive.
1137     // OpenMP [2.11.1, task Construct, Restrictions]
1138     //  At most one if clause can appear on the directive.
1139     //  At most one final clause can appear on the directive.
1140     // OpenMP [teams Construct, Restrictions]
1141     //  At most one num_teams clause can appear on the directive.
1142     //  At most one thread_limit clause can appear on the directive.
1143     // OpenMP [2.9.1, task Construct, Restrictions]
1144     // At most one priority clause can appear on the directive.
1145     // OpenMP [2.9.2, taskloop Construct, Restrictions]
1146     // At most one grainsize clause can appear on the directive.
1147     // OpenMP [2.9.2, taskloop Construct, Restrictions]
1148     // At most one num_tasks clause can appear on the directive.
1149     if (!FirstClause) {
1150       Diag(Tok, diag::err_omp_more_one_clause)
1151           << getOpenMPDirectiveName(DKind) << getOpenMPClauseName(CKind) << 0;
1152       ErrorFound = true;
1153     }
1154 
1155     if (CKind == OMPC_ordered && PP.LookAhead(/*N=*/0).isNot(tok::l_paren))
1156       Clause = ParseOpenMPClause(CKind);
1157     else
1158       Clause = ParseOpenMPSingleExprClause(CKind);
1159     break;
1160   case OMPC_default:
1161   case OMPC_proc_bind:
1162     // OpenMP [2.14.3.1, Restrictions]
1163     //  Only a single default clause may be specified on a parallel, task or
1164     //  teams directive.
1165     // OpenMP [2.5, parallel Construct, Restrictions]
1166     //  At most one proc_bind clause can appear on the directive.
1167     if (!FirstClause) {
1168       Diag(Tok, diag::err_omp_more_one_clause)
1169           << getOpenMPDirectiveName(DKind) << getOpenMPClauseName(CKind) << 0;
1170       ErrorFound = true;
1171     }
1172 
1173     Clause = ParseOpenMPSimpleClause(CKind);
1174     break;
1175   case OMPC_schedule:
1176   case OMPC_dist_schedule:
1177   case OMPC_defaultmap:
1178     // OpenMP [2.7.1, Restrictions, p. 3]
1179     //  Only one schedule clause can appear on a loop directive.
1180     // OpenMP [2.10.4, Restrictions, p. 106]
1181     //  At most one defaultmap clause can appear on the directive.
1182     if (!FirstClause) {
1183       Diag(Tok, diag::err_omp_more_one_clause)
1184           << getOpenMPDirectiveName(DKind) << getOpenMPClauseName(CKind) << 0;
1185       ErrorFound = true;
1186     }
1187 
1188   case OMPC_if:
1189     Clause = ParseOpenMPSingleExprWithArgClause(CKind);
1190     break;
1191   case OMPC_nowait:
1192   case OMPC_untied:
1193   case OMPC_mergeable:
1194   case OMPC_read:
1195   case OMPC_write:
1196   case OMPC_update:
1197   case OMPC_capture:
1198   case OMPC_seq_cst:
1199   case OMPC_threads:
1200   case OMPC_simd:
1201   case OMPC_nogroup:
1202     // OpenMP [2.7.1, Restrictions, p. 9]
1203     //  Only one ordered clause can appear on a loop directive.
1204     // OpenMP [2.7.1, Restrictions, C/C++, p. 4]
1205     //  Only one nowait clause can appear on a for directive.
1206     if (!FirstClause) {
1207       Diag(Tok, diag::err_omp_more_one_clause)
1208           << getOpenMPDirectiveName(DKind) << getOpenMPClauseName(CKind) << 0;
1209       ErrorFound = true;
1210     }
1211 
1212     Clause = ParseOpenMPClause(CKind);
1213     break;
1214   case OMPC_private:
1215   case OMPC_firstprivate:
1216   case OMPC_lastprivate:
1217   case OMPC_shared:
1218   case OMPC_reduction:
1219   case OMPC_linear:
1220   case OMPC_aligned:
1221   case OMPC_copyin:
1222   case OMPC_copyprivate:
1223   case OMPC_flush:
1224   case OMPC_depend:
1225   case OMPC_map:
1226   case OMPC_to:
1227   case OMPC_from:
1228   case OMPC_use_device_ptr:
1229   case OMPC_is_device_ptr:
1230     Clause = ParseOpenMPVarListClause(DKind, CKind);
1231     break;
1232   case OMPC_unknown:
1233     Diag(Tok, diag::warn_omp_extra_tokens_at_eol)
1234         << getOpenMPDirectiveName(DKind);
1235     SkipUntil(tok::annot_pragma_openmp_end, StopBeforeMatch);
1236     break;
1237   case OMPC_threadprivate:
1238   case OMPC_uniform:
1239     Diag(Tok, diag::err_omp_unexpected_clause) << getOpenMPClauseName(CKind)
1240                                                << getOpenMPDirectiveName(DKind);
1241     SkipUntil(tok::comma, tok::annot_pragma_openmp_end, StopBeforeMatch);
1242     break;
1243   }
1244   return ErrorFound ? nullptr : Clause;
1245 }
1246 
1247 /// Parses simple expression in parens for single-expression clauses of OpenMP
1248 /// constructs.
1249 /// \param RLoc Returned location of right paren.
1250 ExprResult Parser::ParseOpenMPParensExpr(StringRef ClauseName,
1251                                          SourceLocation &RLoc) {
1252   BalancedDelimiterTracker T(*this, tok::l_paren, tok::annot_pragma_openmp_end);
1253   if (T.expectAndConsume(diag::err_expected_lparen_after, ClauseName.data()))
1254     return ExprError();
1255 
1256   SourceLocation ELoc = Tok.getLocation();
1257   ExprResult LHS(ParseCastExpression(
1258       /*isUnaryExpression=*/false, /*isAddressOfOperand=*/false, NotTypeCast));
1259   ExprResult Val(ParseRHSOfBinaryExpression(LHS, prec::Conditional));
1260   Val = Actions.ActOnFinishFullExpr(Val.get(), ELoc);
1261 
1262   // Parse ')'.
1263   T.consumeClose();
1264 
1265   RLoc = T.getCloseLocation();
1266   return Val;
1267 }
1268 
1269 /// \brief Parsing of OpenMP clauses with single expressions like 'final',
1270 /// 'collapse', 'safelen', 'num_threads', 'simdlen', 'num_teams',
1271 /// 'thread_limit', 'simdlen', 'priority', 'grainsize', 'num_tasks' or 'hint'.
1272 ///
1273 ///    final-clause:
1274 ///      'final' '(' expression ')'
1275 ///
1276 ///    num_threads-clause:
1277 ///      'num_threads' '(' expression ')'
1278 ///
1279 ///    safelen-clause:
1280 ///      'safelen' '(' expression ')'
1281 ///
1282 ///    simdlen-clause:
1283 ///      'simdlen' '(' expression ')'
1284 ///
1285 ///    collapse-clause:
1286 ///      'collapse' '(' expression ')'
1287 ///
1288 ///    priority-clause:
1289 ///      'priority' '(' expression ')'
1290 ///
1291 ///    grainsize-clause:
1292 ///      'grainsize' '(' expression ')'
1293 ///
1294 ///    num_tasks-clause:
1295 ///      'num_tasks' '(' expression ')'
1296 ///
1297 ///    hint-clause:
1298 ///      'hint' '(' expression ')'
1299 ///
1300 OMPClause *Parser::ParseOpenMPSingleExprClause(OpenMPClauseKind Kind) {
1301   SourceLocation Loc = ConsumeToken();
1302   SourceLocation LLoc = Tok.getLocation();
1303   SourceLocation RLoc;
1304 
1305   ExprResult Val = ParseOpenMPParensExpr(getOpenMPClauseName(Kind), RLoc);
1306 
1307   if (Val.isInvalid())
1308     return nullptr;
1309 
1310   return Actions.ActOnOpenMPSingleExprClause(Kind, Val.get(), Loc, LLoc, RLoc);
1311 }
1312 
1313 /// \brief Parsing of simple OpenMP clauses like 'default' or 'proc_bind'.
1314 ///
1315 ///    default-clause:
1316 ///         'default' '(' 'none' | 'shared' ')
1317 ///
1318 ///    proc_bind-clause:
1319 ///         'proc_bind' '(' 'master' | 'close' | 'spread' ')
1320 ///
1321 OMPClause *Parser::ParseOpenMPSimpleClause(OpenMPClauseKind Kind) {
1322   SourceLocation Loc = Tok.getLocation();
1323   SourceLocation LOpen = ConsumeToken();
1324   // Parse '('.
1325   BalancedDelimiterTracker T(*this, tok::l_paren, tok::annot_pragma_openmp_end);
1326   if (T.expectAndConsume(diag::err_expected_lparen_after,
1327                          getOpenMPClauseName(Kind)))
1328     return nullptr;
1329 
1330   unsigned Type = getOpenMPSimpleClauseType(
1331       Kind, Tok.isAnnotation() ? "" : PP.getSpelling(Tok));
1332   SourceLocation TypeLoc = Tok.getLocation();
1333   if (Tok.isNot(tok::r_paren) && Tok.isNot(tok::comma) &&
1334       Tok.isNot(tok::annot_pragma_openmp_end))
1335     ConsumeAnyToken();
1336 
1337   // Parse ')'.
1338   T.consumeClose();
1339 
1340   return Actions.ActOnOpenMPSimpleClause(Kind, Type, TypeLoc, LOpen, Loc,
1341                                          Tok.getLocation());
1342 }
1343 
1344 /// \brief Parsing of OpenMP clauses like 'ordered'.
1345 ///
1346 ///    ordered-clause:
1347 ///         'ordered'
1348 ///
1349 ///    nowait-clause:
1350 ///         'nowait'
1351 ///
1352 ///    untied-clause:
1353 ///         'untied'
1354 ///
1355 ///    mergeable-clause:
1356 ///         'mergeable'
1357 ///
1358 ///    read-clause:
1359 ///         'read'
1360 ///
1361 ///    threads-clause:
1362 ///         'threads'
1363 ///
1364 ///    simd-clause:
1365 ///         'simd'
1366 ///
1367 ///    nogroup-clause:
1368 ///         'nogroup'
1369 ///
1370 OMPClause *Parser::ParseOpenMPClause(OpenMPClauseKind Kind) {
1371   SourceLocation Loc = Tok.getLocation();
1372   ConsumeAnyToken();
1373 
1374   return Actions.ActOnOpenMPClause(Kind, Loc, Tok.getLocation());
1375 }
1376 
1377 
1378 /// \brief Parsing of OpenMP clauses with single expressions and some additional
1379 /// argument like 'schedule' or 'dist_schedule'.
1380 ///
1381 ///    schedule-clause:
1382 ///      'schedule' '(' [ modifier [ ',' modifier ] ':' ] kind [',' expression ]
1383 ///      ')'
1384 ///
1385 ///    if-clause:
1386 ///      'if' '(' [ directive-name-modifier ':' ] expression ')'
1387 ///
1388 ///    defaultmap:
1389 ///      'defaultmap' '(' modifier ':' kind ')'
1390 ///
1391 OMPClause *Parser::ParseOpenMPSingleExprWithArgClause(OpenMPClauseKind Kind) {
1392   SourceLocation Loc = ConsumeToken();
1393   SourceLocation DelimLoc;
1394   // Parse '('.
1395   BalancedDelimiterTracker T(*this, tok::l_paren, tok::annot_pragma_openmp_end);
1396   if (T.expectAndConsume(diag::err_expected_lparen_after,
1397                          getOpenMPClauseName(Kind)))
1398     return nullptr;
1399 
1400   ExprResult Val;
1401   SmallVector<unsigned, 4> Arg;
1402   SmallVector<SourceLocation, 4> KLoc;
1403   if (Kind == OMPC_schedule) {
1404     enum { Modifier1, Modifier2, ScheduleKind, NumberOfElements };
1405     Arg.resize(NumberOfElements);
1406     KLoc.resize(NumberOfElements);
1407     Arg[Modifier1] = OMPC_SCHEDULE_MODIFIER_unknown;
1408     Arg[Modifier2] = OMPC_SCHEDULE_MODIFIER_unknown;
1409     Arg[ScheduleKind] = OMPC_SCHEDULE_unknown;
1410     auto KindModifier = getOpenMPSimpleClauseType(
1411         Kind, Tok.isAnnotation() ? "" : PP.getSpelling(Tok));
1412     if (KindModifier > OMPC_SCHEDULE_unknown) {
1413       // Parse 'modifier'
1414       Arg[Modifier1] = KindModifier;
1415       KLoc[Modifier1] = Tok.getLocation();
1416       if (Tok.isNot(tok::r_paren) && Tok.isNot(tok::comma) &&
1417           Tok.isNot(tok::annot_pragma_openmp_end))
1418         ConsumeAnyToken();
1419       if (Tok.is(tok::comma)) {
1420         // Parse ',' 'modifier'
1421         ConsumeAnyToken();
1422         KindModifier = getOpenMPSimpleClauseType(
1423             Kind, Tok.isAnnotation() ? "" : PP.getSpelling(Tok));
1424         Arg[Modifier2] = KindModifier > OMPC_SCHEDULE_unknown
1425                              ? KindModifier
1426                              : (unsigned)OMPC_SCHEDULE_unknown;
1427         KLoc[Modifier2] = Tok.getLocation();
1428         if (Tok.isNot(tok::r_paren) && Tok.isNot(tok::comma) &&
1429             Tok.isNot(tok::annot_pragma_openmp_end))
1430           ConsumeAnyToken();
1431       }
1432       // Parse ':'
1433       if (Tok.is(tok::colon))
1434         ConsumeAnyToken();
1435       else
1436         Diag(Tok, diag::warn_pragma_expected_colon) << "schedule modifier";
1437       KindModifier = getOpenMPSimpleClauseType(
1438           Kind, Tok.isAnnotation() ? "" : PP.getSpelling(Tok));
1439     }
1440     Arg[ScheduleKind] = KindModifier;
1441     KLoc[ScheduleKind] = Tok.getLocation();
1442     if (Tok.isNot(tok::r_paren) && Tok.isNot(tok::comma) &&
1443         Tok.isNot(tok::annot_pragma_openmp_end))
1444       ConsumeAnyToken();
1445     if ((Arg[ScheduleKind] == OMPC_SCHEDULE_static ||
1446          Arg[ScheduleKind] == OMPC_SCHEDULE_dynamic ||
1447          Arg[ScheduleKind] == OMPC_SCHEDULE_guided) &&
1448         Tok.is(tok::comma))
1449       DelimLoc = ConsumeAnyToken();
1450   } else if (Kind == OMPC_dist_schedule) {
1451     Arg.push_back(getOpenMPSimpleClauseType(
1452         Kind, Tok.isAnnotation() ? "" : PP.getSpelling(Tok)));
1453     KLoc.push_back(Tok.getLocation());
1454     if (Tok.isNot(tok::r_paren) && Tok.isNot(tok::comma) &&
1455         Tok.isNot(tok::annot_pragma_openmp_end))
1456       ConsumeAnyToken();
1457     if (Arg.back() == OMPC_DIST_SCHEDULE_static && Tok.is(tok::comma))
1458       DelimLoc = ConsumeAnyToken();
1459   } else if (Kind == OMPC_defaultmap) {
1460     // Get a defaultmap modifier
1461     Arg.push_back(getOpenMPSimpleClauseType(
1462         Kind, Tok.isAnnotation() ? "" : PP.getSpelling(Tok)));
1463     KLoc.push_back(Tok.getLocation());
1464     if (Tok.isNot(tok::r_paren) && Tok.isNot(tok::comma) &&
1465         Tok.isNot(tok::annot_pragma_openmp_end))
1466       ConsumeAnyToken();
1467     // Parse ':'
1468     if (Tok.is(tok::colon))
1469       ConsumeAnyToken();
1470     else if (Arg.back() != OMPC_DEFAULTMAP_MODIFIER_unknown)
1471       Diag(Tok, diag::warn_pragma_expected_colon) << "defaultmap modifier";
1472     // Get a defaultmap kind
1473     Arg.push_back(getOpenMPSimpleClauseType(
1474         Kind, Tok.isAnnotation() ? "" : PP.getSpelling(Tok)));
1475     KLoc.push_back(Tok.getLocation());
1476     if (Tok.isNot(tok::r_paren) && Tok.isNot(tok::comma) &&
1477         Tok.isNot(tok::annot_pragma_openmp_end))
1478       ConsumeAnyToken();
1479   } else {
1480     assert(Kind == OMPC_if);
1481     KLoc.push_back(Tok.getLocation());
1482     TentativeParsingAction TPA(*this);
1483     Arg.push_back(ParseOpenMPDirectiveKind(*this));
1484     if (Arg.back() != OMPD_unknown) {
1485       ConsumeToken();
1486       if (Tok.is(tok::colon) && getLangOpts().OpenMP > 40) {
1487         TPA.Commit();
1488         DelimLoc = ConsumeToken();
1489       } else {
1490         TPA.Revert();
1491         Arg.back() = OMPD_unknown;
1492       }
1493     } else
1494       TPA.Revert();
1495   }
1496 
1497   bool NeedAnExpression = (Kind == OMPC_schedule && DelimLoc.isValid()) ||
1498                           (Kind == OMPC_dist_schedule && DelimLoc.isValid()) ||
1499                           Kind == OMPC_if;
1500   if (NeedAnExpression) {
1501     SourceLocation ELoc = Tok.getLocation();
1502     ExprResult LHS(ParseCastExpression(false, false, NotTypeCast));
1503     Val = ParseRHSOfBinaryExpression(LHS, prec::Conditional);
1504     Val = Actions.ActOnFinishFullExpr(Val.get(), ELoc);
1505   }
1506 
1507   // Parse ')'.
1508   T.consumeClose();
1509 
1510   if (NeedAnExpression && Val.isInvalid())
1511     return nullptr;
1512 
1513   return Actions.ActOnOpenMPSingleExprWithArgClause(
1514       Kind, Arg, Val.get(), Loc, T.getOpenLocation(), KLoc, DelimLoc,
1515       T.getCloseLocation());
1516 }
1517 
1518 static bool ParseReductionId(Parser &P, CXXScopeSpec &ReductionIdScopeSpec,
1519                              UnqualifiedId &ReductionId) {
1520   SourceLocation TemplateKWLoc;
1521   if (ReductionIdScopeSpec.isEmpty()) {
1522     auto OOK = OO_None;
1523     switch (P.getCurToken().getKind()) {
1524     case tok::plus:
1525       OOK = OO_Plus;
1526       break;
1527     case tok::minus:
1528       OOK = OO_Minus;
1529       break;
1530     case tok::star:
1531       OOK = OO_Star;
1532       break;
1533     case tok::amp:
1534       OOK = OO_Amp;
1535       break;
1536     case tok::pipe:
1537       OOK = OO_Pipe;
1538       break;
1539     case tok::caret:
1540       OOK = OO_Caret;
1541       break;
1542     case tok::ampamp:
1543       OOK = OO_AmpAmp;
1544       break;
1545     case tok::pipepipe:
1546       OOK = OO_PipePipe;
1547       break;
1548     default:
1549       break;
1550     }
1551     if (OOK != OO_None) {
1552       SourceLocation OpLoc = P.ConsumeToken();
1553       SourceLocation SymbolLocations[] = {OpLoc, OpLoc, SourceLocation()};
1554       ReductionId.setOperatorFunctionId(OpLoc, OOK, SymbolLocations);
1555       return false;
1556     }
1557   }
1558   return P.ParseUnqualifiedId(ReductionIdScopeSpec, /*EnteringContext*/ false,
1559                               /*AllowDestructorName*/ false,
1560                               /*AllowConstructorName*/ false, nullptr,
1561                               TemplateKWLoc, ReductionId);
1562 }
1563 
1564 /// Parses clauses with list.
1565 bool Parser::ParseOpenMPVarList(OpenMPDirectiveKind DKind,
1566                                 OpenMPClauseKind Kind,
1567                                 SmallVectorImpl<Expr *> &Vars,
1568                                 OpenMPVarListDataTy &Data) {
1569   UnqualifiedId UnqualifiedReductionId;
1570   bool InvalidReductionId = false;
1571   bool MapTypeModifierSpecified = false;
1572 
1573   // Parse '('.
1574   BalancedDelimiterTracker T(*this, tok::l_paren, tok::annot_pragma_openmp_end);
1575   if (T.expectAndConsume(diag::err_expected_lparen_after,
1576                          getOpenMPClauseName(Kind)))
1577     return true;
1578 
1579   bool NeedRParenForLinear = false;
1580   BalancedDelimiterTracker LinearT(*this, tok::l_paren,
1581                                   tok::annot_pragma_openmp_end);
1582   // Handle reduction-identifier for reduction clause.
1583   if (Kind == OMPC_reduction) {
1584     ColonProtectionRAIIObject ColonRAII(*this);
1585     if (getLangOpts().CPlusPlus)
1586       ParseOptionalCXXScopeSpecifier(Data.ReductionIdScopeSpec,
1587                                      /*ObjectType=*/nullptr,
1588                                      /*EnteringContext=*/false);
1589     InvalidReductionId = ParseReductionId(*this, Data.ReductionIdScopeSpec,
1590                                           UnqualifiedReductionId);
1591     if (InvalidReductionId) {
1592       SkipUntil(tok::colon, tok::r_paren, tok::annot_pragma_openmp_end,
1593                 StopBeforeMatch);
1594     }
1595     if (Tok.is(tok::colon))
1596       Data.ColonLoc = ConsumeToken();
1597     else
1598       Diag(Tok, diag::warn_pragma_expected_colon) << "reduction identifier";
1599     if (!InvalidReductionId)
1600       Data.ReductionId =
1601           Actions.GetNameFromUnqualifiedId(UnqualifiedReductionId);
1602   } else if (Kind == OMPC_depend) {
1603   // Handle dependency type for depend clause.
1604     ColonProtectionRAIIObject ColonRAII(*this);
1605     Data.DepKind =
1606         static_cast<OpenMPDependClauseKind>(getOpenMPSimpleClauseType(
1607             Kind, Tok.is(tok::identifier) ? PP.getSpelling(Tok) : ""));
1608     Data.DepLinMapLoc = Tok.getLocation();
1609 
1610     if (Data.DepKind == OMPC_DEPEND_unknown) {
1611       SkipUntil(tok::colon, tok::r_paren, tok::annot_pragma_openmp_end,
1612                 StopBeforeMatch);
1613     } else {
1614       ConsumeToken();
1615       // Special processing for depend(source) clause.
1616       if (DKind == OMPD_ordered && Data.DepKind == OMPC_DEPEND_source) {
1617         // Parse ')'.
1618         T.consumeClose();
1619         return false;
1620       }
1621     }
1622     if (Tok.is(tok::colon))
1623       Data.ColonLoc = ConsumeToken();
1624     else {
1625       Diag(Tok, DKind == OMPD_ordered ? diag::warn_pragma_expected_colon_r_paren
1626                                       : diag::warn_pragma_expected_colon)
1627           << "dependency type";
1628     }
1629   } else if (Kind == OMPC_linear) {
1630     // Try to parse modifier if any.
1631     if (Tok.is(tok::identifier) && PP.LookAhead(0).is(tok::l_paren)) {
1632       Data.LinKind = static_cast<OpenMPLinearClauseKind>(
1633           getOpenMPSimpleClauseType(Kind, PP.getSpelling(Tok)));
1634       Data.DepLinMapLoc = ConsumeToken();
1635       LinearT.consumeOpen();
1636       NeedRParenForLinear = true;
1637     }
1638   } else if (Kind == OMPC_map) {
1639     // Handle map type for map clause.
1640     ColonProtectionRAIIObject ColonRAII(*this);
1641 
1642     /// The map clause modifier token can be either a identifier or the C++
1643     /// delete keyword.
1644     auto &&IsMapClauseModifierToken = [](const Token &Tok) -> bool {
1645       return Tok.isOneOf(tok::identifier, tok::kw_delete);
1646     };
1647 
1648     // The first identifier may be a list item, a map-type or a
1649     // map-type-modifier. The map modifier can also be delete which has the same
1650     // spelling of the C++ delete keyword.
1651     Data.MapType =
1652         IsMapClauseModifierToken(Tok)
1653             ? static_cast<OpenMPMapClauseKind>(
1654                   getOpenMPSimpleClauseType(Kind, PP.getSpelling(Tok)))
1655             : OMPC_MAP_unknown;
1656     Data.DepLinMapLoc = Tok.getLocation();
1657     bool ColonExpected = false;
1658 
1659     if (IsMapClauseModifierToken(Tok)) {
1660       if (PP.LookAhead(0).is(tok::colon)) {
1661         if (Data.MapType == OMPC_MAP_unknown)
1662           Diag(Tok, diag::err_omp_unknown_map_type);
1663         else if (Data.MapType == OMPC_MAP_always)
1664           Diag(Tok, diag::err_omp_map_type_missing);
1665         ConsumeToken();
1666       } else if (PP.LookAhead(0).is(tok::comma)) {
1667         if (IsMapClauseModifierToken(PP.LookAhead(1)) &&
1668             PP.LookAhead(2).is(tok::colon)) {
1669           Data.MapTypeModifier = Data.MapType;
1670           if (Data.MapTypeModifier != OMPC_MAP_always) {
1671             Diag(Tok, diag::err_omp_unknown_map_type_modifier);
1672             Data.MapTypeModifier = OMPC_MAP_unknown;
1673           } else
1674             MapTypeModifierSpecified = true;
1675 
1676           ConsumeToken();
1677           ConsumeToken();
1678 
1679           Data.MapType =
1680               IsMapClauseModifierToken(Tok)
1681                   ? static_cast<OpenMPMapClauseKind>(
1682                         getOpenMPSimpleClauseType(Kind, PP.getSpelling(Tok)))
1683                   : OMPC_MAP_unknown;
1684           if (Data.MapType == OMPC_MAP_unknown ||
1685               Data.MapType == OMPC_MAP_always)
1686             Diag(Tok, diag::err_omp_unknown_map_type);
1687           ConsumeToken();
1688         } else {
1689           Data.MapType = OMPC_MAP_tofrom;
1690           Data.IsMapTypeImplicit = true;
1691         }
1692       } else {
1693         Data.MapType = OMPC_MAP_tofrom;
1694         Data.IsMapTypeImplicit = true;
1695       }
1696     } else {
1697       Data.MapType = OMPC_MAP_tofrom;
1698       Data.IsMapTypeImplicit = true;
1699     }
1700 
1701     if (Tok.is(tok::colon))
1702       Data.ColonLoc = ConsumeToken();
1703     else if (ColonExpected)
1704       Diag(Tok, diag::warn_pragma_expected_colon) << "map type";
1705   }
1706 
1707   bool IsComma =
1708       (Kind != OMPC_reduction && Kind != OMPC_depend && Kind != OMPC_map) ||
1709       (Kind == OMPC_reduction && !InvalidReductionId) ||
1710       (Kind == OMPC_map && Data.MapType != OMPC_MAP_unknown &&
1711        (!MapTypeModifierSpecified ||
1712         Data.MapTypeModifier == OMPC_MAP_always)) ||
1713       (Kind == OMPC_depend && Data.DepKind != OMPC_DEPEND_unknown);
1714   const bool MayHaveTail = (Kind == OMPC_linear || Kind == OMPC_aligned);
1715   while (IsComma || (Tok.isNot(tok::r_paren) && Tok.isNot(tok::colon) &&
1716                      Tok.isNot(tok::annot_pragma_openmp_end))) {
1717     ColonProtectionRAIIObject ColonRAII(*this, MayHaveTail);
1718     // Parse variable
1719     ExprResult VarExpr =
1720         Actions.CorrectDelayedTyposInExpr(ParseAssignmentExpression());
1721     if (VarExpr.isUsable())
1722       Vars.push_back(VarExpr.get());
1723     else {
1724       SkipUntil(tok::comma, tok::r_paren, tok::annot_pragma_openmp_end,
1725                 StopBeforeMatch);
1726     }
1727     // Skip ',' if any
1728     IsComma = Tok.is(tok::comma);
1729     if (IsComma)
1730       ConsumeToken();
1731     else if (Tok.isNot(tok::r_paren) &&
1732              Tok.isNot(tok::annot_pragma_openmp_end) &&
1733              (!MayHaveTail || Tok.isNot(tok::colon)))
1734       Diag(Tok, diag::err_omp_expected_punc)
1735           << ((Kind == OMPC_flush) ? getOpenMPDirectiveName(OMPD_flush)
1736                                    : getOpenMPClauseName(Kind))
1737           << (Kind == OMPC_flush);
1738   }
1739 
1740   // Parse ')' for linear clause with modifier.
1741   if (NeedRParenForLinear)
1742     LinearT.consumeClose();
1743 
1744   // Parse ':' linear-step (or ':' alignment).
1745   const bool MustHaveTail = MayHaveTail && Tok.is(tok::colon);
1746   if (MustHaveTail) {
1747     Data.ColonLoc = Tok.getLocation();
1748     SourceLocation ELoc = ConsumeToken();
1749     ExprResult Tail = ParseAssignmentExpression();
1750     Tail = Actions.ActOnFinishFullExpr(Tail.get(), ELoc);
1751     if (Tail.isUsable())
1752       Data.TailExpr = Tail.get();
1753     else
1754       SkipUntil(tok::comma, tok::r_paren, tok::annot_pragma_openmp_end,
1755                 StopBeforeMatch);
1756   }
1757 
1758   // Parse ')'.
1759   T.consumeClose();
1760   if ((Kind == OMPC_depend && Data.DepKind != OMPC_DEPEND_unknown &&
1761        Vars.empty()) ||
1762       (Kind != OMPC_depend && Kind != OMPC_map && Vars.empty()) ||
1763       (MustHaveTail && !Data.TailExpr) || InvalidReductionId)
1764     return true;
1765   return false;
1766 }
1767 
1768 /// \brief Parsing of OpenMP clause 'private', 'firstprivate', 'lastprivate',
1769 /// 'shared', 'copyin', 'copyprivate', 'flush' or 'reduction'.
1770 ///
1771 ///    private-clause:
1772 ///       'private' '(' list ')'
1773 ///    firstprivate-clause:
1774 ///       'firstprivate' '(' list ')'
1775 ///    lastprivate-clause:
1776 ///       'lastprivate' '(' list ')'
1777 ///    shared-clause:
1778 ///       'shared' '(' list ')'
1779 ///    linear-clause:
1780 ///       'linear' '(' linear-list [ ':' linear-step ] ')'
1781 ///    aligned-clause:
1782 ///       'aligned' '(' list [ ':' alignment ] ')'
1783 ///    reduction-clause:
1784 ///       'reduction' '(' reduction-identifier ':' list ')'
1785 ///    copyprivate-clause:
1786 ///       'copyprivate' '(' list ')'
1787 ///    flush-clause:
1788 ///       'flush' '(' list ')'
1789 ///    depend-clause:
1790 ///       'depend' '(' in | out | inout : list | source ')'
1791 ///    map-clause:
1792 ///       'map' '(' [ [ always , ]
1793 ///          to | from | tofrom | alloc | release | delete ':' ] list ')';
1794 ///    to-clause:
1795 ///       'to' '(' list ')'
1796 ///    from-clause:
1797 ///       'from' '(' list ')'
1798 ///    use_device_ptr-clause:
1799 ///       'use_device_ptr' '(' list ')'
1800 ///    is_device_ptr-clause:
1801 ///       'is_device_ptr' '(' list ')'
1802 ///
1803 /// For 'linear' clause linear-list may have the following forms:
1804 ///  list
1805 ///  modifier(list)
1806 /// where modifier is 'val' (C) or 'ref', 'val' or 'uval'(C++).
1807 OMPClause *Parser::ParseOpenMPVarListClause(OpenMPDirectiveKind DKind,
1808                                             OpenMPClauseKind Kind) {
1809   SourceLocation Loc = Tok.getLocation();
1810   SourceLocation LOpen = ConsumeToken();
1811   SmallVector<Expr *, 4> Vars;
1812   OpenMPVarListDataTy Data;
1813 
1814   if (ParseOpenMPVarList(DKind, Kind, Vars, Data))
1815     return nullptr;
1816 
1817   return Actions.ActOnOpenMPVarListClause(
1818       Kind, Vars, Data.TailExpr, Loc, LOpen, Data.ColonLoc, Tok.getLocation(),
1819       Data.ReductionIdScopeSpec, Data.ReductionId, Data.DepKind, Data.LinKind,
1820       Data.MapTypeModifier, Data.MapType, Data.IsMapTypeImplicit,
1821       Data.DepLinMapLoc);
1822 }
1823 
1824