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 /// This file implements parsing of all OpenMP directives and clauses.
11 ///
12 //===----------------------------------------------------------------------===//
13 
14 #include "clang/AST/ASTContext.h"
15 #include "clang/AST/StmtOpenMP.h"
16 #include "clang/Parse/ParseDiagnostic.h"
17 #include "clang/Parse/Parser.h"
18 #include "clang/Parse/RAIIObjectsForParser.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,
118        OMPD_teams_distribute_parallel_for},
119       {OMPD_teams_distribute_parallel_for, OMPD_simd,
120        OMPD_teams_distribute_parallel_for_simd},
121       {OMPD_target, OMPD_teams, OMPD_target_teams},
122       {OMPD_target_teams, OMPD_distribute, OMPD_target_teams_distribute},
123       {OMPD_target_teams_distribute, OMPD_parallel,
124        OMPD_target_teams_distribute_parallel},
125       {OMPD_target_teams_distribute, OMPD_simd,
126        OMPD_target_teams_distribute_simd},
127       {OMPD_target_teams_distribute_parallel, OMPD_for,
128        OMPD_target_teams_distribute_parallel_for},
129       {OMPD_target_teams_distribute_parallel_for, OMPD_simd,
130        OMPD_target_teams_distribute_parallel_for_simd}};
131   enum { CancellationPoint = 0, DeclareReduction = 1, TargetData = 2 };
132   Token Tok = P.getCurToken();
133   unsigned DKind =
134       Tok.isAnnotation()
135           ? static_cast<unsigned>(OMPD_unknown)
136           : getOpenMPDirectiveKindEx(P.getPreprocessor().getSpelling(Tok));
137   if (DKind == OMPD_unknown)
138     return OMPD_unknown;
139 
140   for (unsigned I = 0; I < llvm::array_lengthof(F); ++I) {
141     if (DKind != F[I][0])
142       continue;
143 
144     Tok = P.getPreprocessor().LookAhead(0);
145     unsigned SDKind =
146         Tok.isAnnotation()
147             ? static_cast<unsigned>(OMPD_unknown)
148             : getOpenMPDirectiveKindEx(P.getPreprocessor().getSpelling(Tok));
149     if (SDKind == OMPD_unknown)
150       continue;
151 
152     if (SDKind == F[I][1]) {
153       P.ConsumeToken();
154       DKind = F[I][2];
155     }
156   }
157   return DKind < OMPD_unknown ? static_cast<OpenMPDirectiveKind>(DKind)
158                               : OMPD_unknown;
159 }
160 
161 static DeclarationName parseOpenMPReductionId(Parser &P) {
162   Token Tok = P.getCurToken();
163   Sema &Actions = P.getActions();
164   OverloadedOperatorKind OOK = OO_None;
165   // Allow to use 'operator' keyword for C++ operators
166   bool WithOperator = false;
167   if (Tok.is(tok::kw_operator)) {
168     P.ConsumeToken();
169     Tok = P.getCurToken();
170     WithOperator = true;
171   }
172   switch (Tok.getKind()) {
173   case tok::plus: // '+'
174     OOK = OO_Plus;
175     break;
176   case tok::minus: // '-'
177     OOK = OO_Minus;
178     break;
179   case tok::star: // '*'
180     OOK = OO_Star;
181     break;
182   case tok::amp: // '&'
183     OOK = OO_Amp;
184     break;
185   case tok::pipe: // '|'
186     OOK = OO_Pipe;
187     break;
188   case tok::caret: // '^'
189     OOK = OO_Caret;
190     break;
191   case tok::ampamp: // '&&'
192     OOK = OO_AmpAmp;
193     break;
194   case tok::pipepipe: // '||'
195     OOK = OO_PipePipe;
196     break;
197   case tok::identifier: // identifier
198     if (!WithOperator)
199       break;
200     LLVM_FALLTHROUGH;
201   default:
202     P.Diag(Tok.getLocation(), diag::err_omp_expected_reduction_identifier);
203     P.SkipUntil(tok::colon, tok::r_paren, tok::annot_pragma_openmp_end,
204                 Parser::StopBeforeMatch);
205     return DeclarationName();
206   }
207   P.ConsumeToken();
208   auto &DeclNames = Actions.getASTContext().DeclarationNames;
209   return OOK == OO_None ? DeclNames.getIdentifier(Tok.getIdentifierInfo())
210                         : DeclNames.getCXXOperatorName(OOK);
211 }
212 
213 /// Parse 'omp declare reduction' construct.
214 ///
215 ///       declare-reduction-directive:
216 ///        annot_pragma_openmp 'declare' 'reduction'
217 ///        '(' <reduction_id> ':' <type> {',' <type>} ':' <expression> ')'
218 ///        ['initializer' '(' ('omp_priv' '=' <expression>)|<function_call> ')']
219 ///        annot_pragma_openmp_end
220 /// <reduction_id> is either a base language identifier or one of the following
221 /// operators: '+', '-', '*', '&', '|', '^', '&&' and '||'.
222 ///
223 Parser::DeclGroupPtrTy
224 Parser::ParseOpenMPDeclareReductionDirective(AccessSpecifier AS) {
225   // Parse '('.
226   BalancedDelimiterTracker T(*this, tok::l_paren, tok::annot_pragma_openmp_end);
227   if (T.expectAndConsume(diag::err_expected_lparen_after,
228                          getOpenMPDirectiveName(OMPD_declare_reduction))) {
229     SkipUntil(tok::annot_pragma_openmp_end, StopBeforeMatch);
230     return DeclGroupPtrTy();
231   }
232 
233   DeclarationName Name = parseOpenMPReductionId(*this);
234   if (Name.isEmpty() && Tok.is(tok::annot_pragma_openmp_end))
235     return DeclGroupPtrTy();
236 
237   // Consume ':'.
238   bool IsCorrect = !ExpectAndConsume(tok::colon);
239 
240   if (!IsCorrect && Tok.is(tok::annot_pragma_openmp_end))
241     return DeclGroupPtrTy();
242 
243   IsCorrect = IsCorrect && !Name.isEmpty();
244 
245   if (Tok.is(tok::colon) || Tok.is(tok::annot_pragma_openmp_end)) {
246     Diag(Tok.getLocation(), diag::err_expected_type);
247     IsCorrect = false;
248   }
249 
250   if (!IsCorrect && Tok.is(tok::annot_pragma_openmp_end))
251     return DeclGroupPtrTy();
252 
253   SmallVector<std::pair<QualType, SourceLocation>, 8> ReductionTypes;
254   // Parse list of types until ':' token.
255   do {
256     ColonProtectionRAIIObject ColonRAII(*this);
257     SourceRange Range;
258     TypeResult TR =
259         ParseTypeName(&Range, DeclaratorContext::PrototypeContext, AS);
260     if (TR.isUsable()) {
261       QualType ReductionType =
262           Actions.ActOnOpenMPDeclareReductionType(Range.getBegin(), TR);
263       if (!ReductionType.isNull()) {
264         ReductionTypes.push_back(
265             std::make_pair(ReductionType, Range.getBegin()));
266       }
267     } else {
268       SkipUntil(tok::comma, tok::colon, tok::annot_pragma_openmp_end,
269                 StopBeforeMatch);
270     }
271 
272     if (Tok.is(tok::colon) || Tok.is(tok::annot_pragma_openmp_end))
273       break;
274 
275     // Consume ','.
276     if (ExpectAndConsume(tok::comma)) {
277       IsCorrect = false;
278       if (Tok.is(tok::annot_pragma_openmp_end)) {
279         Diag(Tok.getLocation(), diag::err_expected_type);
280         return DeclGroupPtrTy();
281       }
282     }
283   } while (Tok.isNot(tok::annot_pragma_openmp_end));
284 
285   if (ReductionTypes.empty()) {
286     SkipUntil(tok::annot_pragma_openmp_end, StopBeforeMatch);
287     return DeclGroupPtrTy();
288   }
289 
290   if (!IsCorrect && Tok.is(tok::annot_pragma_openmp_end))
291     return DeclGroupPtrTy();
292 
293   // Consume ':'.
294   if (ExpectAndConsume(tok::colon))
295     IsCorrect = false;
296 
297   if (Tok.is(tok::annot_pragma_openmp_end)) {
298     Diag(Tok.getLocation(), diag::err_expected_expression);
299     return DeclGroupPtrTy();
300   }
301 
302   DeclGroupPtrTy DRD = Actions.ActOnOpenMPDeclareReductionDirectiveStart(
303       getCurScope(), Actions.getCurLexicalContext(), Name, ReductionTypes, AS);
304 
305   // Parse <combiner> expression and then parse initializer if any for each
306   // correct type.
307   unsigned I = 0, E = ReductionTypes.size();
308   for (Decl *D : DRD.get()) {
309     TentativeParsingAction TPA(*this);
310     ParseScope OMPDRScope(this, Scope::FnScope | Scope::DeclScope |
311                                     Scope::CompoundStmtScope |
312                                     Scope::OpenMPDirectiveScope);
313     // Parse <combiner> expression.
314     Actions.ActOnOpenMPDeclareReductionCombinerStart(getCurScope(), D);
315     ExprResult CombinerResult =
316         Actions.ActOnFinishFullExpr(ParseAssignmentExpression().get(),
317                                     D->getLocation(), /*DiscardedValue=*/true);
318     Actions.ActOnOpenMPDeclareReductionCombinerEnd(D, CombinerResult.get());
319 
320     if (CombinerResult.isInvalid() && Tok.isNot(tok::r_paren) &&
321         Tok.isNot(tok::annot_pragma_openmp_end)) {
322       TPA.Commit();
323       IsCorrect = false;
324       break;
325     }
326     IsCorrect = !T.consumeClose() && IsCorrect && CombinerResult.isUsable();
327     ExprResult InitializerResult;
328     if (Tok.isNot(tok::annot_pragma_openmp_end)) {
329       // Parse <initializer> expression.
330       if (Tok.is(tok::identifier) &&
331           Tok.getIdentifierInfo()->isStr("initializer")) {
332         ConsumeToken();
333       } else {
334         Diag(Tok.getLocation(), diag::err_expected) << "'initializer'";
335         TPA.Commit();
336         IsCorrect = false;
337         break;
338       }
339       // Parse '('.
340       BalancedDelimiterTracker T(*this, tok::l_paren,
341                                  tok::annot_pragma_openmp_end);
342       IsCorrect =
343           !T.expectAndConsume(diag::err_expected_lparen_after, "initializer") &&
344           IsCorrect;
345       if (Tok.isNot(tok::annot_pragma_openmp_end)) {
346         ParseScope OMPDRScope(this, Scope::FnScope | Scope::DeclScope |
347                                         Scope::CompoundStmtScope |
348                                         Scope::OpenMPDirectiveScope);
349         // Parse expression.
350         VarDecl *OmpPrivParm =
351             Actions.ActOnOpenMPDeclareReductionInitializerStart(getCurScope(),
352                                                                 D);
353         // Check if initializer is omp_priv <init_expr> or something else.
354         if (Tok.is(tok::identifier) &&
355             Tok.getIdentifierInfo()->isStr("omp_priv")) {
356           ConsumeToken();
357           ParseOpenMPReductionInitializerForDecl(OmpPrivParm);
358         } else {
359           InitializerResult = Actions.ActOnFinishFullExpr(
360               ParseAssignmentExpression().get(), D->getLocation(),
361               /*DiscardedValue=*/true);
362         }
363         Actions.ActOnOpenMPDeclareReductionInitializerEnd(
364             D, InitializerResult.get(), OmpPrivParm);
365         if (InitializerResult.isInvalid() && Tok.isNot(tok::r_paren) &&
366             Tok.isNot(tok::annot_pragma_openmp_end)) {
367           TPA.Commit();
368           IsCorrect = false;
369           break;
370         }
371         IsCorrect =
372             !T.consumeClose() && IsCorrect && !InitializerResult.isInvalid();
373       }
374     }
375 
376     ++I;
377     // Revert parsing if not the last type, otherwise accept it, we're done with
378     // parsing.
379     if (I != E)
380       TPA.Revert();
381     else
382       TPA.Commit();
383   }
384   return Actions.ActOnOpenMPDeclareReductionDirectiveEnd(getCurScope(), DRD,
385                                                          IsCorrect);
386 }
387 
388 void Parser::ParseOpenMPReductionInitializerForDecl(VarDecl *OmpPrivParm) {
389   // Parse declarator '=' initializer.
390   // If a '==' or '+=' is found, suggest a fixit to '='.
391   if (isTokenEqualOrEqualTypo()) {
392     ConsumeToken();
393 
394     if (Tok.is(tok::code_completion)) {
395       Actions.CodeCompleteInitializer(getCurScope(), OmpPrivParm);
396       Actions.FinalizeDeclaration(OmpPrivParm);
397       cutOffParsing();
398       return;
399     }
400 
401     ExprResult Init(ParseInitializer());
402 
403     if (Init.isInvalid()) {
404       SkipUntil(tok::r_paren, tok::annot_pragma_openmp_end, StopBeforeMatch);
405       Actions.ActOnInitializerError(OmpPrivParm);
406     } else {
407       Actions.AddInitializerToDecl(OmpPrivParm, Init.get(),
408                                    /*DirectInit=*/false);
409     }
410   } else if (Tok.is(tok::l_paren)) {
411     // Parse C++ direct initializer: '(' expression-list ')'
412     BalancedDelimiterTracker T(*this, tok::l_paren);
413     T.consumeOpen();
414 
415     ExprVector Exprs;
416     CommaLocsTy CommaLocs;
417 
418     if (ParseExpressionList(Exprs, CommaLocs, [this, OmpPrivParm, &Exprs] {
419           Actions.CodeCompleteConstructor(
420               getCurScope(), OmpPrivParm->getType()->getCanonicalTypeInternal(),
421               OmpPrivParm->getLocation(), Exprs);
422         })) {
423       Actions.ActOnInitializerError(OmpPrivParm);
424       SkipUntil(tok::r_paren, tok::annot_pragma_openmp_end, StopBeforeMatch);
425     } else {
426       // Match the ')'.
427       SourceLocation RLoc = Tok.getLocation();
428       if (!T.consumeClose())
429         RLoc = T.getCloseLocation();
430 
431       assert(!Exprs.empty() && Exprs.size() - 1 == CommaLocs.size() &&
432              "Unexpected number of commas!");
433 
434       ExprResult Initializer =
435           Actions.ActOnParenListExpr(T.getOpenLocation(), RLoc, Exprs);
436       Actions.AddInitializerToDecl(OmpPrivParm, Initializer.get(),
437                                    /*DirectInit=*/true);
438     }
439   } else if (getLangOpts().CPlusPlus11 && Tok.is(tok::l_brace)) {
440     // Parse C++0x braced-init-list.
441     Diag(Tok, diag::warn_cxx98_compat_generalized_initializer_lists);
442 
443     ExprResult Init(ParseBraceInitializer());
444 
445     if (Init.isInvalid()) {
446       Actions.ActOnInitializerError(OmpPrivParm);
447     } else {
448       Actions.AddInitializerToDecl(OmpPrivParm, Init.get(),
449                                    /*DirectInit=*/true);
450     }
451   } else {
452     Actions.ActOnUninitializedDecl(OmpPrivParm);
453   }
454 }
455 
456 namespace {
457 /// RAII that recreates function context for correct parsing of clauses of
458 /// 'declare simd' construct.
459 /// OpenMP, 2.8.2 declare simd Construct
460 /// The expressions appearing in the clauses of this directive are evaluated in
461 /// the scope of the arguments of the function declaration or definition.
462 class FNContextRAII final {
463   Parser &P;
464   Sema::CXXThisScopeRAII *ThisScope;
465   Parser::ParseScope *TempScope;
466   Parser::ParseScope *FnScope;
467   bool HasTemplateScope = false;
468   bool HasFunScope = false;
469   FNContextRAII() = delete;
470   FNContextRAII(const FNContextRAII &) = delete;
471   FNContextRAII &operator=(const FNContextRAII &) = delete;
472 
473 public:
474   FNContextRAII(Parser &P, Parser::DeclGroupPtrTy Ptr) : P(P) {
475     Decl *D = *Ptr.get().begin();
476     NamedDecl *ND = dyn_cast<NamedDecl>(D);
477     RecordDecl *RD = dyn_cast_or_null<RecordDecl>(D->getDeclContext());
478     Sema &Actions = P.getActions();
479 
480     // Allow 'this' within late-parsed attributes.
481     ThisScope = new Sema::CXXThisScopeRAII(Actions, RD, /*TypeQuals=*/0,
482                                            ND && ND->isCXXInstanceMember());
483 
484     // If the Decl is templatized, add template parameters to scope.
485     HasTemplateScope = D->isTemplateDecl();
486     TempScope =
487         new Parser::ParseScope(&P, Scope::TemplateParamScope, HasTemplateScope);
488     if (HasTemplateScope)
489       Actions.ActOnReenterTemplateScope(Actions.getCurScope(), D);
490 
491     // If the Decl is on a function, add function parameters to the scope.
492     HasFunScope = D->isFunctionOrFunctionTemplate();
493     FnScope = new Parser::ParseScope(
494         &P, Scope::FnScope | Scope::DeclScope | Scope::CompoundStmtScope,
495         HasFunScope);
496     if (HasFunScope)
497       Actions.ActOnReenterFunctionContext(Actions.getCurScope(), D);
498   }
499   ~FNContextRAII() {
500     if (HasFunScope) {
501       P.getActions().ActOnExitFunctionContext();
502       FnScope->Exit(); // Pop scope, and remove Decls from IdResolver
503     }
504     if (HasTemplateScope)
505       TempScope->Exit();
506     delete FnScope;
507     delete TempScope;
508     delete ThisScope;
509   }
510 };
511 } // namespace
512 
513 /// Parses clauses for 'declare simd' directive.
514 ///    clause:
515 ///      'inbranch' | 'notinbranch'
516 ///      'simdlen' '(' <expr> ')'
517 ///      { 'uniform' '(' <argument_list> ')' }
518 ///      { 'aligned '(' <argument_list> [ ':' <alignment> ] ')' }
519 ///      { 'linear '(' <argument_list> [ ':' <step> ] ')' }
520 static bool parseDeclareSimdClauses(
521     Parser &P, OMPDeclareSimdDeclAttr::BranchStateTy &BS, ExprResult &SimdLen,
522     SmallVectorImpl<Expr *> &Uniforms, SmallVectorImpl<Expr *> &Aligneds,
523     SmallVectorImpl<Expr *> &Alignments, SmallVectorImpl<Expr *> &Linears,
524     SmallVectorImpl<unsigned> &LinModifiers, SmallVectorImpl<Expr *> &Steps) {
525   SourceRange BSRange;
526   const Token &Tok = P.getCurToken();
527   bool IsError = false;
528   while (Tok.isNot(tok::annot_pragma_openmp_end)) {
529     if (Tok.isNot(tok::identifier))
530       break;
531     OMPDeclareSimdDeclAttr::BranchStateTy Out;
532     IdentifierInfo *II = Tok.getIdentifierInfo();
533     StringRef ClauseName = II->getName();
534     // Parse 'inranch|notinbranch' clauses.
535     if (OMPDeclareSimdDeclAttr::ConvertStrToBranchStateTy(ClauseName, Out)) {
536       if (BS != OMPDeclareSimdDeclAttr::BS_Undefined && BS != Out) {
537         P.Diag(Tok, diag::err_omp_declare_simd_inbranch_notinbranch)
538             << ClauseName
539             << OMPDeclareSimdDeclAttr::ConvertBranchStateTyToStr(BS) << BSRange;
540         IsError = true;
541       }
542       BS = Out;
543       BSRange = SourceRange(Tok.getLocation(), Tok.getEndLoc());
544       P.ConsumeToken();
545     } else if (ClauseName.equals("simdlen")) {
546       if (SimdLen.isUsable()) {
547         P.Diag(Tok, diag::err_omp_more_one_clause)
548             << getOpenMPDirectiveName(OMPD_declare_simd) << ClauseName << 0;
549         IsError = true;
550       }
551       P.ConsumeToken();
552       SourceLocation RLoc;
553       SimdLen = P.ParseOpenMPParensExpr(ClauseName, RLoc);
554       if (SimdLen.isInvalid())
555         IsError = true;
556     } else {
557       OpenMPClauseKind CKind = getOpenMPClauseKind(ClauseName);
558       if (CKind == OMPC_uniform || CKind == OMPC_aligned ||
559           CKind == OMPC_linear) {
560         Parser::OpenMPVarListDataTy Data;
561         SmallVectorImpl<Expr *> *Vars = &Uniforms;
562         if (CKind == OMPC_aligned)
563           Vars = &Aligneds;
564         else if (CKind == OMPC_linear)
565           Vars = &Linears;
566 
567         P.ConsumeToken();
568         if (P.ParseOpenMPVarList(OMPD_declare_simd,
569                                  getOpenMPClauseKind(ClauseName), *Vars, Data))
570           IsError = true;
571         if (CKind == OMPC_aligned) {
572           Alignments.append(Aligneds.size() - Alignments.size(), Data.TailExpr);
573         } else if (CKind == OMPC_linear) {
574           if (P.getActions().CheckOpenMPLinearModifier(Data.LinKind,
575                                                        Data.DepLinMapLoc))
576             Data.LinKind = OMPC_LINEAR_val;
577           LinModifiers.append(Linears.size() - LinModifiers.size(),
578                               Data.LinKind);
579           Steps.append(Linears.size() - Steps.size(), Data.TailExpr);
580         }
581       } else
582         // TODO: add parsing of other clauses.
583         break;
584     }
585     // Skip ',' if any.
586     if (Tok.is(tok::comma))
587       P.ConsumeToken();
588   }
589   return IsError;
590 }
591 
592 /// Parse clauses for '#pragma omp declare simd'.
593 Parser::DeclGroupPtrTy
594 Parser::ParseOMPDeclareSimdClauses(Parser::DeclGroupPtrTy Ptr,
595                                    CachedTokens &Toks, SourceLocation Loc) {
596   PP.EnterToken(Tok);
597   PP.EnterTokenStream(Toks, /*DisableMacroExpansion=*/true);
598   // Consume the previously pushed token.
599   ConsumeAnyToken(/*ConsumeCodeCompletionTok=*/true);
600 
601   FNContextRAII FnContext(*this, Ptr);
602   OMPDeclareSimdDeclAttr::BranchStateTy BS =
603       OMPDeclareSimdDeclAttr::BS_Undefined;
604   ExprResult Simdlen;
605   SmallVector<Expr *, 4> Uniforms;
606   SmallVector<Expr *, 4> Aligneds;
607   SmallVector<Expr *, 4> Alignments;
608   SmallVector<Expr *, 4> Linears;
609   SmallVector<unsigned, 4> LinModifiers;
610   SmallVector<Expr *, 4> Steps;
611   bool IsError =
612       parseDeclareSimdClauses(*this, BS, Simdlen, Uniforms, Aligneds,
613                               Alignments, Linears, LinModifiers, Steps);
614   // Need to check for extra tokens.
615   if (Tok.isNot(tok::annot_pragma_openmp_end)) {
616     Diag(Tok, diag::warn_omp_extra_tokens_at_eol)
617         << getOpenMPDirectiveName(OMPD_declare_simd);
618     while (Tok.isNot(tok::annot_pragma_openmp_end))
619       ConsumeAnyToken();
620   }
621   // Skip the last annot_pragma_openmp_end.
622   SourceLocation EndLoc = ConsumeAnnotationToken();
623   if (IsError)
624     return Ptr;
625   return Actions.ActOnOpenMPDeclareSimdDirective(
626       Ptr, BS, Simdlen.get(), Uniforms, Aligneds, Alignments, Linears,
627       LinModifiers, Steps, SourceRange(Loc, EndLoc));
628 }
629 
630 /// Parsing of declarative OpenMP directives.
631 ///
632 ///       threadprivate-directive:
633 ///         annot_pragma_openmp 'threadprivate' simple-variable-list
634 ///         annot_pragma_openmp_end
635 ///
636 ///       declare-reduction-directive:
637 ///        annot_pragma_openmp 'declare' 'reduction' [...]
638 ///        annot_pragma_openmp_end
639 ///
640 ///       declare-simd-directive:
641 ///         annot_pragma_openmp 'declare simd' {<clause> [,]}
642 ///         annot_pragma_openmp_end
643 ///         <function declaration/definition>
644 ///
645 Parser::DeclGroupPtrTy Parser::ParseOpenMPDeclarativeDirectiveWithExtDecl(
646     AccessSpecifier &AS, ParsedAttributesWithRange &Attrs,
647     DeclSpec::TST TagType, Decl *Tag) {
648   assert(Tok.is(tok::annot_pragma_openmp) && "Not an OpenMP directive!");
649   ParenBraceBracketBalancer BalancerRAIIObj(*this);
650 
651   SourceLocation Loc = ConsumeAnnotationToken();
652   OpenMPDirectiveKind DKind = parseOpenMPDirectiveKind(*this);
653 
654   switch (DKind) {
655   case OMPD_threadprivate: {
656     ConsumeToken();
657     ThreadprivateListParserHelper Helper(this);
658     if (!ParseOpenMPSimpleVarList(OMPD_threadprivate, Helper, true)) {
659       // The last seen token is annot_pragma_openmp_end - need to check for
660       // extra tokens.
661       if (Tok.isNot(tok::annot_pragma_openmp_end)) {
662         Diag(Tok, diag::warn_omp_extra_tokens_at_eol)
663             << getOpenMPDirectiveName(OMPD_threadprivate);
664         SkipUntil(tok::annot_pragma_openmp_end, StopBeforeMatch);
665       }
666       // Skip the last annot_pragma_openmp_end.
667       ConsumeAnnotationToken();
668       return Actions.ActOnOpenMPThreadprivateDirective(Loc,
669                                                        Helper.getIdentifiers());
670     }
671     break;
672   }
673   case OMPD_declare_reduction:
674     ConsumeToken();
675     if (DeclGroupPtrTy Res = ParseOpenMPDeclareReductionDirective(AS)) {
676       // The last seen token is annot_pragma_openmp_end - need to check for
677       // extra tokens.
678       if (Tok.isNot(tok::annot_pragma_openmp_end)) {
679         Diag(Tok, diag::warn_omp_extra_tokens_at_eol)
680             << getOpenMPDirectiveName(OMPD_declare_reduction);
681         while (Tok.isNot(tok::annot_pragma_openmp_end))
682           ConsumeAnyToken();
683       }
684       // Skip the last annot_pragma_openmp_end.
685       ConsumeAnnotationToken();
686       return Res;
687     }
688     break;
689   case OMPD_declare_simd: {
690     // The syntax is:
691     // { #pragma omp declare simd }
692     // <function-declaration-or-definition>
693     //
694     ConsumeToken();
695     CachedTokens Toks;
696     while(Tok.isNot(tok::annot_pragma_openmp_end)) {
697       Toks.push_back(Tok);
698       ConsumeAnyToken();
699     }
700     Toks.push_back(Tok);
701     ConsumeAnyToken();
702 
703     DeclGroupPtrTy Ptr;
704     if (Tok.is(tok::annot_pragma_openmp)) {
705       Ptr = ParseOpenMPDeclarativeDirectiveWithExtDecl(AS, Attrs, TagType, Tag);
706     } else if (Tok.isNot(tok::r_brace) && !isEofOrEom()) {
707       // Here we expect to see some function declaration.
708       if (AS == AS_none) {
709         assert(TagType == DeclSpec::TST_unspecified);
710         MaybeParseCXX11Attributes(Attrs);
711         ParsingDeclSpec PDS(*this);
712         Ptr = ParseExternalDeclaration(Attrs, &PDS);
713       } else {
714         Ptr =
715             ParseCXXClassMemberDeclarationWithPragmas(AS, Attrs, TagType, Tag);
716       }
717     }
718     if (!Ptr) {
719       Diag(Loc, diag::err_omp_decl_in_declare_simd);
720       return DeclGroupPtrTy();
721     }
722     return ParseOMPDeclareSimdClauses(Ptr, Toks, Loc);
723   }
724   case OMPD_declare_target: {
725     SourceLocation DTLoc = ConsumeAnyToken();
726     if (Tok.isNot(tok::annot_pragma_openmp_end)) {
727       // OpenMP 4.5 syntax with list of entities.
728       Sema::NamedDeclSetType SameDirectiveDecls;
729       while (Tok.isNot(tok::annot_pragma_openmp_end)) {
730         OMPDeclareTargetDeclAttr::MapTypeTy MT =
731             OMPDeclareTargetDeclAttr::MT_To;
732         if (Tok.is(tok::identifier)) {
733           IdentifierInfo *II = Tok.getIdentifierInfo();
734           StringRef ClauseName = II->getName();
735           // Parse 'to|link' clauses.
736           if (!OMPDeclareTargetDeclAttr::ConvertStrToMapTypeTy(ClauseName,
737                                                                MT)) {
738             Diag(Tok, diag::err_omp_declare_target_unexpected_clause)
739                 << ClauseName;
740             break;
741           }
742           ConsumeToken();
743         }
744         auto &&Callback = [this, MT, &SameDirectiveDecls](
745                               CXXScopeSpec &SS, DeclarationNameInfo NameInfo) {
746           Actions.ActOnOpenMPDeclareTargetName(getCurScope(), SS, NameInfo, MT,
747                                                SameDirectiveDecls);
748         };
749         if (ParseOpenMPSimpleVarList(OMPD_declare_target, Callback,
750                                      /*AllowScopeSpecifier=*/true))
751           break;
752 
753         // Consume optional ','.
754         if (Tok.is(tok::comma))
755           ConsumeToken();
756       }
757       SkipUntil(tok::annot_pragma_openmp_end, StopBeforeMatch);
758       ConsumeAnyToken();
759       SmallVector<Decl *, 4> Decls(SameDirectiveDecls.begin(),
760                                    SameDirectiveDecls.end());
761       if (Decls.empty())
762         return DeclGroupPtrTy();
763       return Actions.BuildDeclaratorGroup(Decls);
764     }
765 
766     // Skip the last annot_pragma_openmp_end.
767     ConsumeAnyToken();
768 
769     if (!Actions.ActOnStartOpenMPDeclareTargetDirective(DTLoc))
770       return DeclGroupPtrTy();
771 
772     llvm::SmallVector<Decl *, 4>  Decls;
773     DKind = parseOpenMPDirectiveKind(*this);
774     while (DKind != OMPD_end_declare_target && DKind != OMPD_declare_target &&
775            Tok.isNot(tok::eof) && Tok.isNot(tok::r_brace)) {
776       DeclGroupPtrTy Ptr;
777       // Here we expect to see some function declaration.
778       if (AS == AS_none) {
779         assert(TagType == DeclSpec::TST_unspecified);
780         MaybeParseCXX11Attributes(Attrs);
781         ParsingDeclSpec PDS(*this);
782         Ptr = ParseExternalDeclaration(Attrs, &PDS);
783       } else {
784         Ptr =
785             ParseCXXClassMemberDeclarationWithPragmas(AS, Attrs, TagType, Tag);
786       }
787       if (Ptr) {
788         DeclGroupRef Ref = Ptr.get();
789         Decls.append(Ref.begin(), Ref.end());
790       }
791       if (Tok.isAnnotation() && Tok.is(tok::annot_pragma_openmp)) {
792         TentativeParsingAction TPA(*this);
793         ConsumeAnnotationToken();
794         DKind = parseOpenMPDirectiveKind(*this);
795         if (DKind != OMPD_end_declare_target)
796           TPA.Revert();
797         else
798           TPA.Commit();
799       }
800     }
801 
802     if (DKind == OMPD_end_declare_target) {
803       ConsumeAnyToken();
804       if (Tok.isNot(tok::annot_pragma_openmp_end)) {
805         Diag(Tok, diag::warn_omp_extra_tokens_at_eol)
806             << getOpenMPDirectiveName(OMPD_end_declare_target);
807         SkipUntil(tok::annot_pragma_openmp_end, StopBeforeMatch);
808       }
809       // Skip the last annot_pragma_openmp_end.
810       ConsumeAnyToken();
811     } else {
812       Diag(Tok, diag::err_expected_end_declare_target);
813       Diag(DTLoc, diag::note_matching) << "'#pragma omp declare target'";
814     }
815     Actions.ActOnFinishOpenMPDeclareTargetDirective();
816     return Actions.BuildDeclaratorGroup(Decls);
817   }
818   case OMPD_unknown:
819     Diag(Tok, diag::err_omp_unknown_directive);
820     break;
821   case OMPD_parallel:
822   case OMPD_simd:
823   case OMPD_task:
824   case OMPD_taskyield:
825   case OMPD_barrier:
826   case OMPD_taskwait:
827   case OMPD_taskgroup:
828   case OMPD_flush:
829   case OMPD_for:
830   case OMPD_for_simd:
831   case OMPD_sections:
832   case OMPD_section:
833   case OMPD_single:
834   case OMPD_master:
835   case OMPD_ordered:
836   case OMPD_critical:
837   case OMPD_parallel_for:
838   case OMPD_parallel_for_simd:
839   case OMPD_parallel_sections:
840   case OMPD_atomic:
841   case OMPD_target:
842   case OMPD_teams:
843   case OMPD_cancellation_point:
844   case OMPD_cancel:
845   case OMPD_target_data:
846   case OMPD_target_enter_data:
847   case OMPD_target_exit_data:
848   case OMPD_target_parallel:
849   case OMPD_target_parallel_for:
850   case OMPD_taskloop:
851   case OMPD_taskloop_simd:
852   case OMPD_distribute:
853   case OMPD_end_declare_target:
854   case OMPD_target_update:
855   case OMPD_distribute_parallel_for:
856   case OMPD_distribute_parallel_for_simd:
857   case OMPD_distribute_simd:
858   case OMPD_target_parallel_for_simd:
859   case OMPD_target_simd:
860   case OMPD_teams_distribute:
861   case OMPD_teams_distribute_simd:
862   case OMPD_teams_distribute_parallel_for_simd:
863   case OMPD_teams_distribute_parallel_for:
864   case OMPD_target_teams:
865   case OMPD_target_teams_distribute:
866   case OMPD_target_teams_distribute_parallel_for:
867   case OMPD_target_teams_distribute_parallel_for_simd:
868   case OMPD_target_teams_distribute_simd:
869     Diag(Tok, diag::err_omp_unexpected_directive)
870         << 1 << getOpenMPDirectiveName(DKind);
871     break;
872   }
873   while (Tok.isNot(tok::annot_pragma_openmp_end))
874     ConsumeAnyToken();
875   ConsumeAnyToken();
876   return nullptr;
877 }
878 
879 /// Parsing of declarative or executable OpenMP directives.
880 ///
881 ///       threadprivate-directive:
882 ///         annot_pragma_openmp 'threadprivate' simple-variable-list
883 ///         annot_pragma_openmp_end
884 ///
885 ///       declare-reduction-directive:
886 ///         annot_pragma_openmp 'declare' 'reduction' '(' <reduction_id> ':'
887 ///         <type> {',' <type>} ':' <expression> ')' ['initializer' '('
888 ///         ('omp_priv' '=' <expression>|<function_call>) ')']
889 ///         annot_pragma_openmp_end
890 ///
891 ///       executable-directive:
892 ///         annot_pragma_openmp 'parallel' | 'simd' | 'for' | 'sections' |
893 ///         'section' | 'single' | 'master' | 'critical' [ '(' <name> ')' ] |
894 ///         'parallel for' | 'parallel sections' | 'task' | 'taskyield' |
895 ///         'barrier' | 'taskwait' | 'flush' | 'ordered' | 'atomic' |
896 ///         'for simd' | 'parallel for simd' | 'target' | 'target data' |
897 ///         'taskgroup' | 'teams' | 'taskloop' | 'taskloop simd' |
898 ///         'distribute' | 'target enter data' | 'target exit data' |
899 ///         'target parallel' | 'target parallel for' |
900 ///         'target update' | 'distribute parallel for' |
901 ///         'distribute paralle for simd' | 'distribute simd' |
902 ///         'target parallel for simd' | 'target simd' |
903 ///         'teams distribute' | 'teams distribute simd' |
904 ///         'teams distribute parallel for simd' |
905 ///         'teams distribute parallel for' | 'target teams' |
906 ///         'target teams distribute' |
907 ///         'target teams distribute parallel for' |
908 ///         'target teams distribute parallel for simd' |
909 ///         'target teams distribute simd' {clause}
910 ///         annot_pragma_openmp_end
911 ///
912 StmtResult Parser::ParseOpenMPDeclarativeOrExecutableDirective(
913     AllowedConstructsKind Allowed) {
914   assert(Tok.is(tok::annot_pragma_openmp) && "Not an OpenMP directive!");
915   ParenBraceBracketBalancer BalancerRAIIObj(*this);
916   SmallVector<OMPClause *, 5> Clauses;
917   SmallVector<llvm::PointerIntPair<OMPClause *, 1, bool>, OMPC_unknown + 1>
918   FirstClauses(OMPC_unknown + 1);
919   unsigned ScopeFlags = Scope::FnScope | Scope::DeclScope |
920                         Scope::CompoundStmtScope | Scope::OpenMPDirectiveScope;
921   SourceLocation Loc = ConsumeAnnotationToken(), EndLoc;
922   OpenMPDirectiveKind DKind = parseOpenMPDirectiveKind(*this);
923   OpenMPDirectiveKind CancelRegion = OMPD_unknown;
924   // Name of critical directive.
925   DeclarationNameInfo DirName;
926   StmtResult Directive = StmtError();
927   bool HasAssociatedStatement = true;
928   bool FlushHasClause = false;
929 
930   switch (DKind) {
931   case OMPD_threadprivate: {
932     if (Allowed != ACK_Any) {
933       Diag(Tok, diag::err_omp_immediate_directive)
934           << getOpenMPDirectiveName(DKind) << 0;
935     }
936     ConsumeToken();
937     ThreadprivateListParserHelper Helper(this);
938     if (!ParseOpenMPSimpleVarList(OMPD_threadprivate, Helper, false)) {
939       // The last seen token is annot_pragma_openmp_end - need to check for
940       // extra tokens.
941       if (Tok.isNot(tok::annot_pragma_openmp_end)) {
942         Diag(Tok, diag::warn_omp_extra_tokens_at_eol)
943             << getOpenMPDirectiveName(OMPD_threadprivate);
944         SkipUntil(tok::annot_pragma_openmp_end, StopBeforeMatch);
945       }
946       DeclGroupPtrTy Res = Actions.ActOnOpenMPThreadprivateDirective(
947           Loc, Helper.getIdentifiers());
948       Directive = Actions.ActOnDeclStmt(Res, Loc, Tok.getLocation());
949     }
950     SkipUntil(tok::annot_pragma_openmp_end);
951     break;
952   }
953   case OMPD_declare_reduction:
954     ConsumeToken();
955     if (DeclGroupPtrTy Res =
956             ParseOpenMPDeclareReductionDirective(/*AS=*/AS_none)) {
957       // The last seen token is annot_pragma_openmp_end - need to check for
958       // extra tokens.
959       if (Tok.isNot(tok::annot_pragma_openmp_end)) {
960         Diag(Tok, diag::warn_omp_extra_tokens_at_eol)
961             << getOpenMPDirectiveName(OMPD_declare_reduction);
962         while (Tok.isNot(tok::annot_pragma_openmp_end))
963           ConsumeAnyToken();
964       }
965       ConsumeAnyToken();
966       Directive = Actions.ActOnDeclStmt(Res, Loc, Tok.getLocation());
967     } else {
968       SkipUntil(tok::annot_pragma_openmp_end);
969     }
970     break;
971   case OMPD_flush:
972     if (PP.LookAhead(0).is(tok::l_paren)) {
973       FlushHasClause = true;
974       // Push copy of the current token back to stream to properly parse
975       // pseudo-clause OMPFlushClause.
976       PP.EnterToken(Tok);
977     }
978     LLVM_FALLTHROUGH;
979   case OMPD_taskyield:
980   case OMPD_barrier:
981   case OMPD_taskwait:
982   case OMPD_cancellation_point:
983   case OMPD_cancel:
984   case OMPD_target_enter_data:
985   case OMPD_target_exit_data:
986   case OMPD_target_update:
987     if (Allowed == ACK_StatementsOpenMPNonStandalone) {
988       Diag(Tok, diag::err_omp_immediate_directive)
989           << getOpenMPDirectiveName(DKind) << 0;
990     }
991     HasAssociatedStatement = false;
992     // Fall through for further analysis.
993     LLVM_FALLTHROUGH;
994   case OMPD_parallel:
995   case OMPD_simd:
996   case OMPD_for:
997   case OMPD_for_simd:
998   case OMPD_sections:
999   case OMPD_single:
1000   case OMPD_section:
1001   case OMPD_master:
1002   case OMPD_critical:
1003   case OMPD_parallel_for:
1004   case OMPD_parallel_for_simd:
1005   case OMPD_parallel_sections:
1006   case OMPD_task:
1007   case OMPD_ordered:
1008   case OMPD_atomic:
1009   case OMPD_target:
1010   case OMPD_teams:
1011   case OMPD_taskgroup:
1012   case OMPD_target_data:
1013   case OMPD_target_parallel:
1014   case OMPD_target_parallel_for:
1015   case OMPD_taskloop:
1016   case OMPD_taskloop_simd:
1017   case OMPD_distribute:
1018   case OMPD_distribute_parallel_for:
1019   case OMPD_distribute_parallel_for_simd:
1020   case OMPD_distribute_simd:
1021   case OMPD_target_parallel_for_simd:
1022   case OMPD_target_simd:
1023   case OMPD_teams_distribute:
1024   case OMPD_teams_distribute_simd:
1025   case OMPD_teams_distribute_parallel_for_simd:
1026   case OMPD_teams_distribute_parallel_for:
1027   case OMPD_target_teams:
1028   case OMPD_target_teams_distribute:
1029   case OMPD_target_teams_distribute_parallel_for:
1030   case OMPD_target_teams_distribute_parallel_for_simd:
1031   case OMPD_target_teams_distribute_simd: {
1032     ConsumeToken();
1033     // Parse directive name of the 'critical' directive if any.
1034     if (DKind == OMPD_critical) {
1035       BalancedDelimiterTracker T(*this, tok::l_paren,
1036                                  tok::annot_pragma_openmp_end);
1037       if (!T.consumeOpen()) {
1038         if (Tok.isAnyIdentifier()) {
1039           DirName =
1040               DeclarationNameInfo(Tok.getIdentifierInfo(), Tok.getLocation());
1041           ConsumeAnyToken();
1042         } else {
1043           Diag(Tok, diag::err_omp_expected_identifier_for_critical);
1044         }
1045         T.consumeClose();
1046       }
1047     } else if (DKind == OMPD_cancellation_point || DKind == OMPD_cancel) {
1048       CancelRegion = parseOpenMPDirectiveKind(*this);
1049       if (Tok.isNot(tok::annot_pragma_openmp_end))
1050         ConsumeToken();
1051     }
1052 
1053     if (isOpenMPLoopDirective(DKind))
1054       ScopeFlags |= Scope::OpenMPLoopDirectiveScope;
1055     if (isOpenMPSimdDirective(DKind))
1056       ScopeFlags |= Scope::OpenMPSimdDirectiveScope;
1057     ParseScope OMPDirectiveScope(this, ScopeFlags);
1058     Actions.StartOpenMPDSABlock(DKind, DirName, Actions.getCurScope(), Loc);
1059 
1060     while (Tok.isNot(tok::annot_pragma_openmp_end)) {
1061       OpenMPClauseKind CKind =
1062           Tok.isAnnotation()
1063               ? OMPC_unknown
1064               : FlushHasClause ? OMPC_flush
1065                                : getOpenMPClauseKind(PP.getSpelling(Tok));
1066       Actions.StartOpenMPClause(CKind);
1067       FlushHasClause = false;
1068       OMPClause *Clause =
1069           ParseOpenMPClause(DKind, CKind, !FirstClauses[CKind].getInt());
1070       FirstClauses[CKind].setInt(true);
1071       if (Clause) {
1072         FirstClauses[CKind].setPointer(Clause);
1073         Clauses.push_back(Clause);
1074       }
1075 
1076       // Skip ',' if any.
1077       if (Tok.is(tok::comma))
1078         ConsumeToken();
1079       Actions.EndOpenMPClause();
1080     }
1081     // End location of the directive.
1082     EndLoc = Tok.getLocation();
1083     // Consume final annot_pragma_openmp_end.
1084     ConsumeAnnotationToken();
1085 
1086     // OpenMP [2.13.8, ordered Construct, Syntax]
1087     // If the depend clause is specified, the ordered construct is a stand-alone
1088     // directive.
1089     if (DKind == OMPD_ordered && FirstClauses[OMPC_depend].getInt()) {
1090       if (Allowed == ACK_StatementsOpenMPNonStandalone) {
1091         Diag(Loc, diag::err_omp_immediate_directive)
1092             << getOpenMPDirectiveName(DKind) << 1
1093             << getOpenMPClauseName(OMPC_depend);
1094       }
1095       HasAssociatedStatement = false;
1096     }
1097 
1098     StmtResult AssociatedStmt;
1099     if (HasAssociatedStatement) {
1100       // The body is a block scope like in Lambdas and Blocks.
1101       Actions.ActOnOpenMPRegionStart(DKind, getCurScope());
1102       // FIXME: We create a bogus CompoundStmt scope to hold the contents of
1103       // the captured region. Code elsewhere assumes that any FunctionScopeInfo
1104       // should have at least one compound statement scope within it.
1105       AssociatedStmt = (Sema::CompoundScopeRAII(Actions), ParseStatement());
1106       AssociatedStmt = Actions.ActOnOpenMPRegionEnd(AssociatedStmt, Clauses);
1107     } else if (DKind == OMPD_target_update || DKind == OMPD_target_enter_data ||
1108                DKind == OMPD_target_exit_data) {
1109       Actions.ActOnOpenMPRegionStart(DKind, getCurScope());
1110       AssociatedStmt = (Sema::CompoundScopeRAII(Actions),
1111                         Actions.ActOnCompoundStmt(Loc, Loc, llvm::None,
1112                                                   /*isStmtExpr=*/false));
1113       AssociatedStmt = Actions.ActOnOpenMPRegionEnd(AssociatedStmt, Clauses);
1114     }
1115     Directive = Actions.ActOnOpenMPExecutableDirective(
1116         DKind, DirName, CancelRegion, Clauses, AssociatedStmt.get(), Loc,
1117         EndLoc);
1118 
1119     // Exit scope.
1120     Actions.EndOpenMPDSABlock(Directive.get());
1121     OMPDirectiveScope.Exit();
1122     break;
1123   }
1124   case OMPD_declare_simd:
1125   case OMPD_declare_target:
1126   case OMPD_end_declare_target:
1127     Diag(Tok, diag::err_omp_unexpected_directive)
1128         << 1 << getOpenMPDirectiveName(DKind);
1129     SkipUntil(tok::annot_pragma_openmp_end);
1130     break;
1131   case OMPD_unknown:
1132     Diag(Tok, diag::err_omp_unknown_directive);
1133     SkipUntil(tok::annot_pragma_openmp_end);
1134     break;
1135   }
1136   return Directive;
1137 }
1138 
1139 // Parses simple list:
1140 //   simple-variable-list:
1141 //         '(' id-expression {, id-expression} ')'
1142 //
1143 bool Parser::ParseOpenMPSimpleVarList(
1144     OpenMPDirectiveKind Kind,
1145     const llvm::function_ref<void(CXXScopeSpec &, DeclarationNameInfo)> &
1146         Callback,
1147     bool AllowScopeSpecifier) {
1148   // Parse '('.
1149   BalancedDelimiterTracker T(*this, tok::l_paren, tok::annot_pragma_openmp_end);
1150   if (T.expectAndConsume(diag::err_expected_lparen_after,
1151                          getOpenMPDirectiveName(Kind)))
1152     return true;
1153   bool IsCorrect = true;
1154   bool NoIdentIsFound = true;
1155 
1156   // Read tokens while ')' or annot_pragma_openmp_end is not found.
1157   while (Tok.isNot(tok::r_paren) && Tok.isNot(tok::annot_pragma_openmp_end)) {
1158     CXXScopeSpec SS;
1159     UnqualifiedId Name;
1160     // Read var name.
1161     Token PrevTok = Tok;
1162     NoIdentIsFound = false;
1163 
1164     if (AllowScopeSpecifier && getLangOpts().CPlusPlus &&
1165         ParseOptionalCXXScopeSpecifier(SS, nullptr, false)) {
1166       IsCorrect = false;
1167       SkipUntil(tok::comma, tok::r_paren, tok::annot_pragma_openmp_end,
1168                 StopBeforeMatch);
1169     } else if (ParseUnqualifiedId(SS, false, false, false, false, nullptr,
1170                                   nullptr, Name)) {
1171       IsCorrect = false;
1172       SkipUntil(tok::comma, tok::r_paren, tok::annot_pragma_openmp_end,
1173                 StopBeforeMatch);
1174     } else if (Tok.isNot(tok::comma) && Tok.isNot(tok::r_paren) &&
1175                Tok.isNot(tok::annot_pragma_openmp_end)) {
1176       IsCorrect = false;
1177       SkipUntil(tok::comma, tok::r_paren, tok::annot_pragma_openmp_end,
1178                 StopBeforeMatch);
1179       Diag(PrevTok.getLocation(), diag::err_expected)
1180           << tok::identifier
1181           << SourceRange(PrevTok.getLocation(), PrevTokLocation);
1182     } else {
1183       Callback(SS, Actions.GetNameFromUnqualifiedId(Name));
1184     }
1185     // Consume ','.
1186     if (Tok.is(tok::comma)) {
1187       ConsumeToken();
1188     }
1189   }
1190 
1191   if (NoIdentIsFound) {
1192     Diag(Tok, diag::err_expected) << tok::identifier;
1193     IsCorrect = false;
1194   }
1195 
1196   // Parse ')'.
1197   IsCorrect = !T.consumeClose() && IsCorrect;
1198 
1199   return !IsCorrect;
1200 }
1201 
1202 /// Parsing of OpenMP clauses.
1203 ///
1204 ///    clause:
1205 ///       if-clause | final-clause | num_threads-clause | safelen-clause |
1206 ///       default-clause | private-clause | firstprivate-clause | shared-clause
1207 ///       | linear-clause | aligned-clause | collapse-clause |
1208 ///       lastprivate-clause | reduction-clause | proc_bind-clause |
1209 ///       schedule-clause | copyin-clause | copyprivate-clause | untied-clause |
1210 ///       mergeable-clause | flush-clause | read-clause | write-clause |
1211 ///       update-clause | capture-clause | seq_cst-clause | device-clause |
1212 ///       simdlen-clause | threads-clause | simd-clause | num_teams-clause |
1213 ///       thread_limit-clause | priority-clause | grainsize-clause |
1214 ///       nogroup-clause | num_tasks-clause | hint-clause | to-clause |
1215 ///       from-clause | is_device_ptr-clause | task_reduction-clause |
1216 ///       in_reduction-clause
1217 ///
1218 OMPClause *Parser::ParseOpenMPClause(OpenMPDirectiveKind DKind,
1219                                      OpenMPClauseKind CKind, bool FirstClause) {
1220   OMPClause *Clause = nullptr;
1221   bool ErrorFound = false;
1222   bool WrongDirective = false;
1223   // Check if clause is allowed for the given directive.
1224   if (CKind != OMPC_unknown && !isAllowedClauseForDirective(DKind, CKind)) {
1225     Diag(Tok, diag::err_omp_unexpected_clause) << getOpenMPClauseName(CKind)
1226                                                << getOpenMPDirectiveName(DKind);
1227     ErrorFound = true;
1228     WrongDirective = true;
1229   }
1230 
1231   switch (CKind) {
1232   case OMPC_final:
1233   case OMPC_num_threads:
1234   case OMPC_safelen:
1235   case OMPC_simdlen:
1236   case OMPC_collapse:
1237   case OMPC_ordered:
1238   case OMPC_device:
1239   case OMPC_num_teams:
1240   case OMPC_thread_limit:
1241   case OMPC_priority:
1242   case OMPC_grainsize:
1243   case OMPC_num_tasks:
1244   case OMPC_hint:
1245     // OpenMP [2.5, Restrictions]
1246     //  At most one num_threads clause can appear on the directive.
1247     // OpenMP [2.8.1, simd construct, Restrictions]
1248     //  Only one safelen  clause can appear on a simd directive.
1249     //  Only one simdlen  clause can appear on a simd directive.
1250     //  Only one collapse clause can appear on a simd directive.
1251     // OpenMP [2.9.1, target data construct, Restrictions]
1252     //  At most one device clause can appear on the directive.
1253     // OpenMP [2.11.1, task Construct, Restrictions]
1254     //  At most one if clause can appear on the directive.
1255     //  At most one final clause can appear on the directive.
1256     // OpenMP [teams Construct, Restrictions]
1257     //  At most one num_teams clause can appear on the directive.
1258     //  At most one thread_limit clause can appear on the directive.
1259     // OpenMP [2.9.1, task Construct, Restrictions]
1260     // At most one priority clause can appear on the directive.
1261     // OpenMP [2.9.2, taskloop Construct, Restrictions]
1262     // At most one grainsize clause can appear on the directive.
1263     // OpenMP [2.9.2, taskloop Construct, Restrictions]
1264     // At most one num_tasks clause can appear on the directive.
1265     if (!FirstClause) {
1266       Diag(Tok, diag::err_omp_more_one_clause)
1267           << getOpenMPDirectiveName(DKind) << getOpenMPClauseName(CKind) << 0;
1268       ErrorFound = true;
1269     }
1270 
1271     if (CKind == OMPC_ordered && PP.LookAhead(/*N=*/0).isNot(tok::l_paren))
1272       Clause = ParseOpenMPClause(CKind, WrongDirective);
1273     else
1274       Clause = ParseOpenMPSingleExprClause(CKind, WrongDirective);
1275     break;
1276   case OMPC_default:
1277   case OMPC_proc_bind:
1278     // OpenMP [2.14.3.1, Restrictions]
1279     //  Only a single default clause may be specified on a parallel, task or
1280     //  teams directive.
1281     // OpenMP [2.5, parallel Construct, Restrictions]
1282     //  At most one proc_bind clause can appear on the directive.
1283     if (!FirstClause) {
1284       Diag(Tok, diag::err_omp_more_one_clause)
1285           << getOpenMPDirectiveName(DKind) << getOpenMPClauseName(CKind) << 0;
1286       ErrorFound = true;
1287     }
1288 
1289     Clause = ParseOpenMPSimpleClause(CKind, WrongDirective);
1290     break;
1291   case OMPC_schedule:
1292   case OMPC_dist_schedule:
1293   case OMPC_defaultmap:
1294     // OpenMP [2.7.1, Restrictions, p. 3]
1295     //  Only one schedule clause can appear on a loop directive.
1296     // OpenMP [2.10.4, Restrictions, p. 106]
1297     //  At most one defaultmap clause can appear on the directive.
1298     if (!FirstClause) {
1299       Diag(Tok, diag::err_omp_more_one_clause)
1300           << getOpenMPDirectiveName(DKind) << getOpenMPClauseName(CKind) << 0;
1301       ErrorFound = true;
1302     }
1303     LLVM_FALLTHROUGH;
1304 
1305   case OMPC_if:
1306     Clause = ParseOpenMPSingleExprWithArgClause(CKind, WrongDirective);
1307     break;
1308   case OMPC_nowait:
1309   case OMPC_untied:
1310   case OMPC_mergeable:
1311   case OMPC_read:
1312   case OMPC_write:
1313   case OMPC_update:
1314   case OMPC_capture:
1315   case OMPC_seq_cst:
1316   case OMPC_threads:
1317   case OMPC_simd:
1318   case OMPC_nogroup:
1319     // OpenMP [2.7.1, Restrictions, p. 9]
1320     //  Only one ordered clause can appear on a loop directive.
1321     // OpenMP [2.7.1, Restrictions, C/C++, p. 4]
1322     //  Only one nowait clause can appear on a for directive.
1323     if (!FirstClause) {
1324       Diag(Tok, diag::err_omp_more_one_clause)
1325           << getOpenMPDirectiveName(DKind) << getOpenMPClauseName(CKind) << 0;
1326       ErrorFound = true;
1327     }
1328 
1329     Clause = ParseOpenMPClause(CKind, WrongDirective);
1330     break;
1331   case OMPC_private:
1332   case OMPC_firstprivate:
1333   case OMPC_lastprivate:
1334   case OMPC_shared:
1335   case OMPC_reduction:
1336   case OMPC_task_reduction:
1337   case OMPC_in_reduction:
1338   case OMPC_linear:
1339   case OMPC_aligned:
1340   case OMPC_copyin:
1341   case OMPC_copyprivate:
1342   case OMPC_flush:
1343   case OMPC_depend:
1344   case OMPC_map:
1345   case OMPC_to:
1346   case OMPC_from:
1347   case OMPC_use_device_ptr:
1348   case OMPC_is_device_ptr:
1349     Clause = ParseOpenMPVarListClause(DKind, CKind, WrongDirective);
1350     break;
1351   case OMPC_unknown:
1352     Diag(Tok, diag::warn_omp_extra_tokens_at_eol)
1353         << getOpenMPDirectiveName(DKind);
1354     SkipUntil(tok::annot_pragma_openmp_end, StopBeforeMatch);
1355     break;
1356   case OMPC_threadprivate:
1357   case OMPC_uniform:
1358     if (!WrongDirective)
1359       Diag(Tok, diag::err_omp_unexpected_clause)
1360           << getOpenMPClauseName(CKind) << getOpenMPDirectiveName(DKind);
1361     SkipUntil(tok::comma, tok::annot_pragma_openmp_end, StopBeforeMatch);
1362     break;
1363   }
1364   return ErrorFound ? nullptr : Clause;
1365 }
1366 
1367 /// Parses simple expression in parens for single-expression clauses of OpenMP
1368 /// constructs.
1369 /// \param RLoc Returned location of right paren.
1370 ExprResult Parser::ParseOpenMPParensExpr(StringRef ClauseName,
1371                                          SourceLocation &RLoc) {
1372   BalancedDelimiterTracker T(*this, tok::l_paren, tok::annot_pragma_openmp_end);
1373   if (T.expectAndConsume(diag::err_expected_lparen_after, ClauseName.data()))
1374     return ExprError();
1375 
1376   SourceLocation ELoc = Tok.getLocation();
1377   ExprResult LHS(ParseCastExpression(
1378       /*isUnaryExpression=*/false, /*isAddressOfOperand=*/false, NotTypeCast));
1379   ExprResult Val(ParseRHSOfBinaryExpression(LHS, prec::Conditional));
1380   Val = Actions.ActOnFinishFullExpr(Val.get(), ELoc);
1381 
1382   // Parse ')'.
1383   RLoc = Tok.getLocation();
1384   if (!T.consumeClose())
1385     RLoc = T.getCloseLocation();
1386 
1387   return Val;
1388 }
1389 
1390 /// Parsing of OpenMP clauses with single expressions like 'final',
1391 /// 'collapse', 'safelen', 'num_threads', 'simdlen', 'num_teams',
1392 /// 'thread_limit', 'simdlen', 'priority', 'grainsize', 'num_tasks' or 'hint'.
1393 ///
1394 ///    final-clause:
1395 ///      'final' '(' expression ')'
1396 ///
1397 ///    num_threads-clause:
1398 ///      'num_threads' '(' expression ')'
1399 ///
1400 ///    safelen-clause:
1401 ///      'safelen' '(' expression ')'
1402 ///
1403 ///    simdlen-clause:
1404 ///      'simdlen' '(' expression ')'
1405 ///
1406 ///    collapse-clause:
1407 ///      'collapse' '(' expression ')'
1408 ///
1409 ///    priority-clause:
1410 ///      'priority' '(' expression ')'
1411 ///
1412 ///    grainsize-clause:
1413 ///      'grainsize' '(' expression ')'
1414 ///
1415 ///    num_tasks-clause:
1416 ///      'num_tasks' '(' expression ')'
1417 ///
1418 ///    hint-clause:
1419 ///      'hint' '(' expression ')'
1420 ///
1421 OMPClause *Parser::ParseOpenMPSingleExprClause(OpenMPClauseKind Kind,
1422                                                bool ParseOnly) {
1423   SourceLocation Loc = ConsumeToken();
1424   SourceLocation LLoc = Tok.getLocation();
1425   SourceLocation RLoc;
1426 
1427   ExprResult Val = ParseOpenMPParensExpr(getOpenMPClauseName(Kind), RLoc);
1428 
1429   if (Val.isInvalid())
1430     return nullptr;
1431 
1432   if (ParseOnly)
1433     return nullptr;
1434   return Actions.ActOnOpenMPSingleExprClause(Kind, Val.get(), Loc, LLoc, RLoc);
1435 }
1436 
1437 /// Parsing of simple OpenMP clauses like 'default' or 'proc_bind'.
1438 ///
1439 ///    default-clause:
1440 ///         'default' '(' 'none' | 'shared' ')
1441 ///
1442 ///    proc_bind-clause:
1443 ///         'proc_bind' '(' 'master' | 'close' | 'spread' ')
1444 ///
1445 OMPClause *Parser::ParseOpenMPSimpleClause(OpenMPClauseKind Kind,
1446                                            bool ParseOnly) {
1447   SourceLocation Loc = Tok.getLocation();
1448   SourceLocation LOpen = ConsumeToken();
1449   // Parse '('.
1450   BalancedDelimiterTracker T(*this, tok::l_paren, tok::annot_pragma_openmp_end);
1451   if (T.expectAndConsume(diag::err_expected_lparen_after,
1452                          getOpenMPClauseName(Kind)))
1453     return nullptr;
1454 
1455   unsigned Type = getOpenMPSimpleClauseType(
1456       Kind, Tok.isAnnotation() ? "" : PP.getSpelling(Tok));
1457   SourceLocation TypeLoc = Tok.getLocation();
1458   if (Tok.isNot(tok::r_paren) && Tok.isNot(tok::comma) &&
1459       Tok.isNot(tok::annot_pragma_openmp_end))
1460     ConsumeAnyToken();
1461 
1462   // Parse ')'.
1463   SourceLocation RLoc = Tok.getLocation();
1464   if (!T.consumeClose())
1465     RLoc = T.getCloseLocation();
1466 
1467   if (ParseOnly)
1468     return nullptr;
1469   return Actions.ActOnOpenMPSimpleClause(Kind, Type, TypeLoc, LOpen, Loc, RLoc);
1470 }
1471 
1472 /// Parsing of OpenMP clauses like 'ordered'.
1473 ///
1474 ///    ordered-clause:
1475 ///         'ordered'
1476 ///
1477 ///    nowait-clause:
1478 ///         'nowait'
1479 ///
1480 ///    untied-clause:
1481 ///         'untied'
1482 ///
1483 ///    mergeable-clause:
1484 ///         'mergeable'
1485 ///
1486 ///    read-clause:
1487 ///         'read'
1488 ///
1489 ///    threads-clause:
1490 ///         'threads'
1491 ///
1492 ///    simd-clause:
1493 ///         'simd'
1494 ///
1495 ///    nogroup-clause:
1496 ///         'nogroup'
1497 ///
1498 OMPClause *Parser::ParseOpenMPClause(OpenMPClauseKind Kind, bool ParseOnly) {
1499   SourceLocation Loc = Tok.getLocation();
1500   ConsumeAnyToken();
1501 
1502   if (ParseOnly)
1503     return nullptr;
1504   return Actions.ActOnOpenMPClause(Kind, Loc, Tok.getLocation());
1505 }
1506 
1507 
1508 /// Parsing of OpenMP clauses with single expressions and some additional
1509 /// argument like 'schedule' or 'dist_schedule'.
1510 ///
1511 ///    schedule-clause:
1512 ///      'schedule' '(' [ modifier [ ',' modifier ] ':' ] kind [',' expression ]
1513 ///      ')'
1514 ///
1515 ///    if-clause:
1516 ///      'if' '(' [ directive-name-modifier ':' ] expression ')'
1517 ///
1518 ///    defaultmap:
1519 ///      'defaultmap' '(' modifier ':' kind ')'
1520 ///
1521 OMPClause *Parser::ParseOpenMPSingleExprWithArgClause(OpenMPClauseKind Kind,
1522                                                       bool ParseOnly) {
1523   SourceLocation Loc = ConsumeToken();
1524   SourceLocation DelimLoc;
1525   // Parse '('.
1526   BalancedDelimiterTracker T(*this, tok::l_paren, tok::annot_pragma_openmp_end);
1527   if (T.expectAndConsume(diag::err_expected_lparen_after,
1528                          getOpenMPClauseName(Kind)))
1529     return nullptr;
1530 
1531   ExprResult Val;
1532   SmallVector<unsigned, 4> Arg;
1533   SmallVector<SourceLocation, 4> KLoc;
1534   if (Kind == OMPC_schedule) {
1535     enum { Modifier1, Modifier2, ScheduleKind, NumberOfElements };
1536     Arg.resize(NumberOfElements);
1537     KLoc.resize(NumberOfElements);
1538     Arg[Modifier1] = OMPC_SCHEDULE_MODIFIER_unknown;
1539     Arg[Modifier2] = OMPC_SCHEDULE_MODIFIER_unknown;
1540     Arg[ScheduleKind] = OMPC_SCHEDULE_unknown;
1541     unsigned KindModifier = getOpenMPSimpleClauseType(
1542         Kind, Tok.isAnnotation() ? "" : PP.getSpelling(Tok));
1543     if (KindModifier > OMPC_SCHEDULE_unknown) {
1544       // Parse 'modifier'
1545       Arg[Modifier1] = KindModifier;
1546       KLoc[Modifier1] = Tok.getLocation();
1547       if (Tok.isNot(tok::r_paren) && Tok.isNot(tok::comma) &&
1548           Tok.isNot(tok::annot_pragma_openmp_end))
1549         ConsumeAnyToken();
1550       if (Tok.is(tok::comma)) {
1551         // Parse ',' 'modifier'
1552         ConsumeAnyToken();
1553         KindModifier = getOpenMPSimpleClauseType(
1554             Kind, Tok.isAnnotation() ? "" : PP.getSpelling(Tok));
1555         Arg[Modifier2] = KindModifier > OMPC_SCHEDULE_unknown
1556                              ? KindModifier
1557                              : (unsigned)OMPC_SCHEDULE_unknown;
1558         KLoc[Modifier2] = Tok.getLocation();
1559         if (Tok.isNot(tok::r_paren) && Tok.isNot(tok::comma) &&
1560             Tok.isNot(tok::annot_pragma_openmp_end))
1561           ConsumeAnyToken();
1562       }
1563       // Parse ':'
1564       if (Tok.is(tok::colon))
1565         ConsumeAnyToken();
1566       else
1567         Diag(Tok, diag::warn_pragma_expected_colon) << "schedule modifier";
1568       KindModifier = getOpenMPSimpleClauseType(
1569           Kind, Tok.isAnnotation() ? "" : PP.getSpelling(Tok));
1570     }
1571     Arg[ScheduleKind] = KindModifier;
1572     KLoc[ScheduleKind] = Tok.getLocation();
1573     if (Tok.isNot(tok::r_paren) && Tok.isNot(tok::comma) &&
1574         Tok.isNot(tok::annot_pragma_openmp_end))
1575       ConsumeAnyToken();
1576     if ((Arg[ScheduleKind] == OMPC_SCHEDULE_static ||
1577          Arg[ScheduleKind] == OMPC_SCHEDULE_dynamic ||
1578          Arg[ScheduleKind] == OMPC_SCHEDULE_guided) &&
1579         Tok.is(tok::comma))
1580       DelimLoc = ConsumeAnyToken();
1581   } else if (Kind == OMPC_dist_schedule) {
1582     Arg.push_back(getOpenMPSimpleClauseType(
1583         Kind, Tok.isAnnotation() ? "" : PP.getSpelling(Tok)));
1584     KLoc.push_back(Tok.getLocation());
1585     if (Tok.isNot(tok::r_paren) && Tok.isNot(tok::comma) &&
1586         Tok.isNot(tok::annot_pragma_openmp_end))
1587       ConsumeAnyToken();
1588     if (Arg.back() == OMPC_DIST_SCHEDULE_static && Tok.is(tok::comma))
1589       DelimLoc = ConsumeAnyToken();
1590   } else if (Kind == OMPC_defaultmap) {
1591     // Get a defaultmap modifier
1592     Arg.push_back(getOpenMPSimpleClauseType(
1593         Kind, Tok.isAnnotation() ? "" : PP.getSpelling(Tok)));
1594     KLoc.push_back(Tok.getLocation());
1595     if (Tok.isNot(tok::r_paren) && Tok.isNot(tok::comma) &&
1596         Tok.isNot(tok::annot_pragma_openmp_end))
1597       ConsumeAnyToken();
1598     // Parse ':'
1599     if (Tok.is(tok::colon))
1600       ConsumeAnyToken();
1601     else if (Arg.back() != OMPC_DEFAULTMAP_MODIFIER_unknown)
1602       Diag(Tok, diag::warn_pragma_expected_colon) << "defaultmap modifier";
1603     // Get a defaultmap kind
1604     Arg.push_back(getOpenMPSimpleClauseType(
1605         Kind, Tok.isAnnotation() ? "" : PP.getSpelling(Tok)));
1606     KLoc.push_back(Tok.getLocation());
1607     if (Tok.isNot(tok::r_paren) && Tok.isNot(tok::comma) &&
1608         Tok.isNot(tok::annot_pragma_openmp_end))
1609       ConsumeAnyToken();
1610   } else {
1611     assert(Kind == OMPC_if);
1612     KLoc.push_back(Tok.getLocation());
1613     TentativeParsingAction TPA(*this);
1614     Arg.push_back(parseOpenMPDirectiveKind(*this));
1615     if (Arg.back() != OMPD_unknown) {
1616       ConsumeToken();
1617       if (Tok.is(tok::colon) && getLangOpts().OpenMP > 40) {
1618         TPA.Commit();
1619         DelimLoc = ConsumeToken();
1620       } else {
1621         TPA.Revert();
1622         Arg.back() = OMPD_unknown;
1623       }
1624     } else {
1625       TPA.Revert();
1626     }
1627   }
1628 
1629   bool NeedAnExpression = (Kind == OMPC_schedule && DelimLoc.isValid()) ||
1630                           (Kind == OMPC_dist_schedule && DelimLoc.isValid()) ||
1631                           Kind == OMPC_if;
1632   if (NeedAnExpression) {
1633     SourceLocation ELoc = Tok.getLocation();
1634     ExprResult LHS(ParseCastExpression(false, false, NotTypeCast));
1635     Val = ParseRHSOfBinaryExpression(LHS, prec::Conditional);
1636     Val = Actions.ActOnFinishFullExpr(Val.get(), ELoc);
1637   }
1638 
1639   // Parse ')'.
1640   SourceLocation RLoc = Tok.getLocation();
1641   if (!T.consumeClose())
1642     RLoc = T.getCloseLocation();
1643 
1644   if (NeedAnExpression && Val.isInvalid())
1645     return nullptr;
1646 
1647   if (ParseOnly)
1648     return nullptr;
1649   return Actions.ActOnOpenMPSingleExprWithArgClause(
1650       Kind, Arg, Val.get(), Loc, T.getOpenLocation(), KLoc, DelimLoc, RLoc);
1651 }
1652 
1653 static bool ParseReductionId(Parser &P, CXXScopeSpec &ReductionIdScopeSpec,
1654                              UnqualifiedId &ReductionId) {
1655   if (ReductionIdScopeSpec.isEmpty()) {
1656     auto OOK = OO_None;
1657     switch (P.getCurToken().getKind()) {
1658     case tok::plus:
1659       OOK = OO_Plus;
1660       break;
1661     case tok::minus:
1662       OOK = OO_Minus;
1663       break;
1664     case tok::star:
1665       OOK = OO_Star;
1666       break;
1667     case tok::amp:
1668       OOK = OO_Amp;
1669       break;
1670     case tok::pipe:
1671       OOK = OO_Pipe;
1672       break;
1673     case tok::caret:
1674       OOK = OO_Caret;
1675       break;
1676     case tok::ampamp:
1677       OOK = OO_AmpAmp;
1678       break;
1679     case tok::pipepipe:
1680       OOK = OO_PipePipe;
1681       break;
1682     default:
1683       break;
1684     }
1685     if (OOK != OO_None) {
1686       SourceLocation OpLoc = P.ConsumeToken();
1687       SourceLocation SymbolLocations[] = {OpLoc, OpLoc, SourceLocation()};
1688       ReductionId.setOperatorFunctionId(OpLoc, OOK, SymbolLocations);
1689       return false;
1690     }
1691   }
1692   return P.ParseUnqualifiedId(ReductionIdScopeSpec, /*EnteringContext*/ false,
1693                               /*AllowDestructorName*/ false,
1694                               /*AllowConstructorName*/ false,
1695                               /*AllowDeductionGuide*/ false,
1696                               nullptr, nullptr, ReductionId);
1697 }
1698 
1699 /// Parses clauses with list.
1700 bool Parser::ParseOpenMPVarList(OpenMPDirectiveKind DKind,
1701                                 OpenMPClauseKind Kind,
1702                                 SmallVectorImpl<Expr *> &Vars,
1703                                 OpenMPVarListDataTy &Data) {
1704   UnqualifiedId UnqualifiedReductionId;
1705   bool InvalidReductionId = false;
1706   bool MapTypeModifierSpecified = false;
1707 
1708   // Parse '('.
1709   BalancedDelimiterTracker T(*this, tok::l_paren, tok::annot_pragma_openmp_end);
1710   if (T.expectAndConsume(diag::err_expected_lparen_after,
1711                          getOpenMPClauseName(Kind)))
1712     return true;
1713 
1714   bool NeedRParenForLinear = false;
1715   BalancedDelimiterTracker LinearT(*this, tok::l_paren,
1716                                   tok::annot_pragma_openmp_end);
1717   // Handle reduction-identifier for reduction clause.
1718   if (Kind == OMPC_reduction || Kind == OMPC_task_reduction ||
1719       Kind == OMPC_in_reduction) {
1720     ColonProtectionRAIIObject ColonRAII(*this);
1721     if (getLangOpts().CPlusPlus)
1722       ParseOptionalCXXScopeSpecifier(Data.ReductionIdScopeSpec,
1723                                      /*ObjectType=*/nullptr,
1724                                      /*EnteringContext=*/false);
1725     InvalidReductionId = ParseReductionId(*this, Data.ReductionIdScopeSpec,
1726                                           UnqualifiedReductionId);
1727     if (InvalidReductionId) {
1728       SkipUntil(tok::colon, tok::r_paren, tok::annot_pragma_openmp_end,
1729                 StopBeforeMatch);
1730     }
1731     if (Tok.is(tok::colon))
1732       Data.ColonLoc = ConsumeToken();
1733     else
1734       Diag(Tok, diag::warn_pragma_expected_colon) << "reduction identifier";
1735     if (!InvalidReductionId)
1736       Data.ReductionId =
1737           Actions.GetNameFromUnqualifiedId(UnqualifiedReductionId);
1738   } else if (Kind == OMPC_depend) {
1739   // Handle dependency type for depend clause.
1740     ColonProtectionRAIIObject ColonRAII(*this);
1741     Data.DepKind =
1742         static_cast<OpenMPDependClauseKind>(getOpenMPSimpleClauseType(
1743             Kind, Tok.is(tok::identifier) ? PP.getSpelling(Tok) : ""));
1744     Data.DepLinMapLoc = Tok.getLocation();
1745 
1746     if (Data.DepKind == OMPC_DEPEND_unknown) {
1747       SkipUntil(tok::colon, tok::r_paren, tok::annot_pragma_openmp_end,
1748                 StopBeforeMatch);
1749     } else {
1750       ConsumeToken();
1751       // Special processing for depend(source) clause.
1752       if (DKind == OMPD_ordered && Data.DepKind == OMPC_DEPEND_source) {
1753         // Parse ')'.
1754         T.consumeClose();
1755         return false;
1756       }
1757     }
1758     if (Tok.is(tok::colon)) {
1759       Data.ColonLoc = ConsumeToken();
1760     } else {
1761       Diag(Tok, DKind == OMPD_ordered ? diag::warn_pragma_expected_colon_r_paren
1762                                       : diag::warn_pragma_expected_colon)
1763           << "dependency type";
1764     }
1765   } else if (Kind == OMPC_linear) {
1766     // Try to parse modifier if any.
1767     if (Tok.is(tok::identifier) && PP.LookAhead(0).is(tok::l_paren)) {
1768       Data.LinKind = static_cast<OpenMPLinearClauseKind>(
1769           getOpenMPSimpleClauseType(Kind, PP.getSpelling(Tok)));
1770       Data.DepLinMapLoc = ConsumeToken();
1771       LinearT.consumeOpen();
1772       NeedRParenForLinear = true;
1773     }
1774   } else if (Kind == OMPC_map) {
1775     // Handle map type for map clause.
1776     ColonProtectionRAIIObject ColonRAII(*this);
1777 
1778     /// The map clause modifier token can be either a identifier or the C++
1779     /// delete keyword.
1780     auto &&IsMapClauseModifierToken = [](const Token &Tok) -> bool {
1781       return Tok.isOneOf(tok::identifier, tok::kw_delete);
1782     };
1783 
1784     // The first identifier may be a list item, a map-type or a
1785     // map-type-modifier. The map modifier can also be delete which has the same
1786     // spelling of the C++ delete keyword.
1787     Data.MapType =
1788         IsMapClauseModifierToken(Tok)
1789             ? static_cast<OpenMPMapClauseKind>(
1790                   getOpenMPSimpleClauseType(Kind, PP.getSpelling(Tok)))
1791             : OMPC_MAP_unknown;
1792     Data.DepLinMapLoc = Tok.getLocation();
1793     bool ColonExpected = false;
1794 
1795     if (IsMapClauseModifierToken(Tok)) {
1796       if (PP.LookAhead(0).is(tok::colon)) {
1797         if (Data.MapType == OMPC_MAP_unknown)
1798           Diag(Tok, diag::err_omp_unknown_map_type);
1799         else if (Data.MapType == OMPC_MAP_always)
1800           Diag(Tok, diag::err_omp_map_type_missing);
1801         ConsumeToken();
1802       } else if (PP.LookAhead(0).is(tok::comma)) {
1803         if (IsMapClauseModifierToken(PP.LookAhead(1)) &&
1804             PP.LookAhead(2).is(tok::colon)) {
1805           Data.MapTypeModifier = Data.MapType;
1806           if (Data.MapTypeModifier != OMPC_MAP_always) {
1807             Diag(Tok, diag::err_omp_unknown_map_type_modifier);
1808             Data.MapTypeModifier = OMPC_MAP_unknown;
1809           } else {
1810             MapTypeModifierSpecified = true;
1811           }
1812 
1813           ConsumeToken();
1814           ConsumeToken();
1815 
1816           Data.MapType =
1817               IsMapClauseModifierToken(Tok)
1818                   ? static_cast<OpenMPMapClauseKind>(
1819                         getOpenMPSimpleClauseType(Kind, PP.getSpelling(Tok)))
1820                   : OMPC_MAP_unknown;
1821           if (Data.MapType == OMPC_MAP_unknown ||
1822               Data.MapType == OMPC_MAP_always)
1823             Diag(Tok, diag::err_omp_unknown_map_type);
1824           ConsumeToken();
1825         } else {
1826           Data.MapType = OMPC_MAP_tofrom;
1827           Data.IsMapTypeImplicit = true;
1828         }
1829       } else if (IsMapClauseModifierToken(PP.LookAhead(0))) {
1830         if (PP.LookAhead(1).is(tok::colon)) {
1831           Data.MapTypeModifier = Data.MapType;
1832           if (Data.MapTypeModifier != OMPC_MAP_always) {
1833             Diag(Tok, diag::err_omp_unknown_map_type_modifier);
1834             Data.MapTypeModifier = OMPC_MAP_unknown;
1835           } else {
1836             MapTypeModifierSpecified = true;
1837           }
1838 
1839           ConsumeToken();
1840 
1841           Data.MapType =
1842               IsMapClauseModifierToken(Tok)
1843                   ? static_cast<OpenMPMapClauseKind>(
1844                         getOpenMPSimpleClauseType(Kind, PP.getSpelling(Tok)))
1845                   : OMPC_MAP_unknown;
1846           if (Data.MapType == OMPC_MAP_unknown ||
1847               Data.MapType == OMPC_MAP_always)
1848             Diag(Tok, diag::err_omp_unknown_map_type);
1849           ConsumeToken();
1850         } else {
1851           Data.MapType = OMPC_MAP_tofrom;
1852           Data.IsMapTypeImplicit = true;
1853         }
1854       } else {
1855         Data.MapType = OMPC_MAP_tofrom;
1856         Data.IsMapTypeImplicit = true;
1857       }
1858     } else {
1859       Data.MapType = OMPC_MAP_tofrom;
1860       Data.IsMapTypeImplicit = true;
1861     }
1862 
1863     if (Tok.is(tok::colon))
1864       Data.ColonLoc = ConsumeToken();
1865     else if (ColonExpected)
1866       Diag(Tok, diag::warn_pragma_expected_colon) << "map type";
1867   }
1868 
1869   bool IsComma =
1870       (Kind != OMPC_reduction && Kind != OMPC_task_reduction &&
1871        Kind != OMPC_in_reduction && Kind != OMPC_depend && Kind != OMPC_map) ||
1872       (Kind == OMPC_reduction && !InvalidReductionId) ||
1873       (Kind == OMPC_map && Data.MapType != OMPC_MAP_unknown &&
1874        (!MapTypeModifierSpecified ||
1875         Data.MapTypeModifier == OMPC_MAP_always)) ||
1876       (Kind == OMPC_depend && Data.DepKind != OMPC_DEPEND_unknown);
1877   const bool MayHaveTail = (Kind == OMPC_linear || Kind == OMPC_aligned);
1878   while (IsComma || (Tok.isNot(tok::r_paren) && Tok.isNot(tok::colon) &&
1879                      Tok.isNot(tok::annot_pragma_openmp_end))) {
1880     ColonProtectionRAIIObject ColonRAII(*this, MayHaveTail);
1881     // Parse variable
1882     ExprResult VarExpr =
1883         Actions.CorrectDelayedTyposInExpr(ParseAssignmentExpression());
1884     if (VarExpr.isUsable()) {
1885       Vars.push_back(VarExpr.get());
1886     } else {
1887       SkipUntil(tok::comma, tok::r_paren, tok::annot_pragma_openmp_end,
1888                 StopBeforeMatch);
1889     }
1890     // Skip ',' if any
1891     IsComma = Tok.is(tok::comma);
1892     if (IsComma)
1893       ConsumeToken();
1894     else if (Tok.isNot(tok::r_paren) &&
1895              Tok.isNot(tok::annot_pragma_openmp_end) &&
1896              (!MayHaveTail || Tok.isNot(tok::colon)))
1897       Diag(Tok, diag::err_omp_expected_punc)
1898           << ((Kind == OMPC_flush) ? getOpenMPDirectiveName(OMPD_flush)
1899                                    : getOpenMPClauseName(Kind))
1900           << (Kind == OMPC_flush);
1901   }
1902 
1903   // Parse ')' for linear clause with modifier.
1904   if (NeedRParenForLinear)
1905     LinearT.consumeClose();
1906 
1907   // Parse ':' linear-step (or ':' alignment).
1908   const bool MustHaveTail = MayHaveTail && Tok.is(tok::colon);
1909   if (MustHaveTail) {
1910     Data.ColonLoc = Tok.getLocation();
1911     SourceLocation ELoc = ConsumeToken();
1912     ExprResult Tail = ParseAssignmentExpression();
1913     Tail = Actions.ActOnFinishFullExpr(Tail.get(), ELoc);
1914     if (Tail.isUsable())
1915       Data.TailExpr = Tail.get();
1916     else
1917       SkipUntil(tok::comma, tok::r_paren, tok::annot_pragma_openmp_end,
1918                 StopBeforeMatch);
1919   }
1920 
1921   // Parse ')'.
1922   Data.RLoc = Tok.getLocation();
1923   if (!T.consumeClose())
1924     Data.RLoc = T.getCloseLocation();
1925   return (Kind == OMPC_depend && Data.DepKind != OMPC_DEPEND_unknown &&
1926           Vars.empty()) ||
1927          (Kind != OMPC_depend && Kind != OMPC_map && Vars.empty()) ||
1928          (MustHaveTail && !Data.TailExpr) || InvalidReductionId;
1929 }
1930 
1931 /// Parsing of OpenMP clause 'private', 'firstprivate', 'lastprivate',
1932 /// 'shared', 'copyin', 'copyprivate', 'flush', 'reduction', 'task_reduction' or
1933 /// 'in_reduction'.
1934 ///
1935 ///    private-clause:
1936 ///       'private' '(' list ')'
1937 ///    firstprivate-clause:
1938 ///       'firstprivate' '(' list ')'
1939 ///    lastprivate-clause:
1940 ///       'lastprivate' '(' list ')'
1941 ///    shared-clause:
1942 ///       'shared' '(' list ')'
1943 ///    linear-clause:
1944 ///       'linear' '(' linear-list [ ':' linear-step ] ')'
1945 ///    aligned-clause:
1946 ///       'aligned' '(' list [ ':' alignment ] ')'
1947 ///    reduction-clause:
1948 ///       'reduction' '(' reduction-identifier ':' list ')'
1949 ///    task_reduction-clause:
1950 ///       'task_reduction' '(' reduction-identifier ':' list ')'
1951 ///    in_reduction-clause:
1952 ///       'in_reduction' '(' reduction-identifier ':' list ')'
1953 ///    copyprivate-clause:
1954 ///       'copyprivate' '(' list ')'
1955 ///    flush-clause:
1956 ///       'flush' '(' list ')'
1957 ///    depend-clause:
1958 ///       'depend' '(' in | out | inout : list | source ')'
1959 ///    map-clause:
1960 ///       'map' '(' [ [ always , ]
1961 ///          to | from | tofrom | alloc | release | delete ':' ] list ')';
1962 ///    to-clause:
1963 ///       'to' '(' list ')'
1964 ///    from-clause:
1965 ///       'from' '(' list ')'
1966 ///    use_device_ptr-clause:
1967 ///       'use_device_ptr' '(' list ')'
1968 ///    is_device_ptr-clause:
1969 ///       'is_device_ptr' '(' list ')'
1970 ///
1971 /// For 'linear' clause linear-list may have the following forms:
1972 ///  list
1973 ///  modifier(list)
1974 /// where modifier is 'val' (C) or 'ref', 'val' or 'uval'(C++).
1975 OMPClause *Parser::ParseOpenMPVarListClause(OpenMPDirectiveKind DKind,
1976                                             OpenMPClauseKind Kind,
1977                                             bool ParseOnly) {
1978   SourceLocation Loc = Tok.getLocation();
1979   SourceLocation LOpen = ConsumeToken();
1980   SmallVector<Expr *, 4> Vars;
1981   OpenMPVarListDataTy Data;
1982 
1983   if (ParseOpenMPVarList(DKind, Kind, Vars, Data))
1984     return nullptr;
1985 
1986   if (ParseOnly)
1987     return nullptr;
1988   return Actions.ActOnOpenMPVarListClause(
1989       Kind, Vars, Data.TailExpr, Loc, LOpen, Data.ColonLoc, Data.RLoc,
1990       Data.ReductionIdScopeSpec, Data.ReductionId, Data.DepKind, Data.LinKind,
1991       Data.MapTypeModifier, Data.MapType, Data.IsMapTypeImplicit,
1992       Data.DepLinMapLoc);
1993 }
1994 
1995