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+//===--- SemaOpenMP.cpp - Semantic Analysis for OpenMP constructs ----------===//
+//
+// The LLVM Compiler Infrastructure
+//
+// This file is distributed under the University of Illinois Open Source
+// License. See LICENSE.TXT for details.
+//
+//===----------------------------------------------------------------------===//
+/// \file
+/// \brief This file implements semantic analysis for OpenMP directives and
+/// clauses.
+///
+//===----------------------------------------------------------------------===//
+
+#include "clang/Basic/OpenMPKinds.h"
+#include "clang/AST/Decl.h"
+#include "clang/AST/DeclCXX.h"
+#include "clang/AST/DeclOpenMP.h"
+#include "clang/AST/StmtCXX.h"
+#include "clang/AST/StmtOpenMP.h"
+#include "clang/AST/StmtVisitor.h"
+#include "clang/Lex/Preprocessor.h"
+#include "clang/Sema/Initialization.h"
+#include "clang/Sema/SemaInternal.h"
+#include "clang/Sema/Lookup.h"
+#include "clang/Sema/Scope.h"
+#include "clang/Sema/ScopeInfo.h"
+using namespace clang;
+
+//===----------------------------------------------------------------------===//
+// Stack of data-sharing attributes for variables
+//===----------------------------------------------------------------------===//
+
+namespace {
+/// \brief Default data sharing attributes, which can be applied to directive.
+enum DefaultDataSharingAttributes {
+ DSA_unspecified = 0, /// \brief Data sharing attribute not specified.
+ DSA_none = 1 << 0, /// \brief Default data sharing attribute 'none'.
+ DSA_shared = 1 << 1 /// \brief Default data sharing attribute 'shared'.
+};
+
+/// \brief Stack for tracking declarations used in OpenMP directives and
+/// clauses and their data-sharing attributes.
+class DSAStackTy {
+public:
+ struct DSAVarData {
+ OpenMPDirectiveKind DKind;
+ OpenMPClauseKind CKind;
+ DeclRefExpr *RefExpr;
+ DSAVarData() : DKind(OMPD_unknown), CKind(OMPC_unknown), RefExpr(0) { }
+ };
+private:
+ struct DSAInfo {
+ OpenMPClauseKind Attributes;
+ DeclRefExpr *RefExpr;
+ };
+ typedef llvm::SmallDenseMap<VarDecl *, DSAInfo, 64> DeclSAMapTy;
+
+ struct SharingMapTy {
+ DeclSAMapTy SharingMap;
+ DefaultDataSharingAttributes DefaultAttr;
+ OpenMPDirectiveKind Directive;
+ DeclarationNameInfo DirectiveName;
+ Scope *CurScope;
+ SharingMapTy(OpenMPDirectiveKind DKind,
+ const DeclarationNameInfo &Name,
+ Scope *CurScope)
+ : SharingMap(), DefaultAttr(DSA_unspecified), Directive(DKind),
+ DirectiveName(Name), CurScope(CurScope) { }
+ SharingMapTy()
+ : SharingMap(), DefaultAttr(DSA_unspecified),
+ Directive(OMPD_unknown), DirectiveName(),
+ CurScope(0) { }
+ };
+
+ typedef SmallVector<SharingMapTy, 64> StackTy;
+
+ /// \brief Stack of used declaration and their data-sharing attributes.
+ StackTy Stack;
+ Sema &Actions;
+
+ typedef SmallVector<SharingMapTy, 8>::reverse_iterator reverse_iterator;
+
+ DSAVarData getDSA(StackTy::reverse_iterator Iter, VarDecl *D);
+public:
+ explicit DSAStackTy(Sema &S) : Stack(1), Actions(S) { }
+
+ void push(OpenMPDirectiveKind DKind, const DeclarationNameInfo &DirName,
+ Scope *CurScope) {
+ Stack.push_back(SharingMapTy(DKind, DirName, CurScope));
+ }
+
+ void pop() {
+ assert(Stack.size() > 1 && "Data-sharing attributes stack is empty!");
+ Stack.pop_back();
+ }
+
+ /// \brief Adds explicit data sharing attribute to the specified declaration.
+ void addDSA(VarDecl *D, DeclRefExpr *E, OpenMPClauseKind A);
+
+ /// \brief Checks if the variable is a local for OpenMP region.
+ bool isOpenMPLocal(VarDecl *D);
+
+ /// \brief Returns data sharing attributes from top of the stack for the
+ /// specified declaration.
+ DSAVarData getTopDSA(VarDecl *D);
+ /// \brief Returns data-sharing attributes for the specified declaration.
+ DSAVarData getImplicitDSA(VarDecl *D);
+ /// \brief Checks if the specified variables has \a CKind data-sharing
+ /// attribute in \a DKind directive.
+ DSAVarData hasDSA(VarDecl *D, OpenMPClauseKind CKind,
+ OpenMPDirectiveKind DKind = OMPD_unknown);
+
+
+ /// \brief Returns currently analyzed directive.
+ OpenMPDirectiveKind getCurrentDirective() const {
+ return Stack.back().Directive;
+ }
+
+ /// \brief Set default data sharing attribute to none.
+ void setDefaultDSANone() { Stack.back().DefaultAttr = DSA_none; }
+ /// \brief Set default data sharing attribute to shared.
+ void setDefaultDSAShared() { Stack.back().DefaultAttr = DSA_shared; }
+
+ DefaultDataSharingAttributes getDefaultDSA() const {
+ return Stack.back().DefaultAttr;
+ }
+
+ Scope *getCurScope() { return Stack.back().CurScope; }
+};
+} // end anonymous namespace.
+
+DSAStackTy::DSAVarData DSAStackTy::getDSA(StackTy::reverse_iterator Iter,
+ VarDecl *D) {
+ DSAVarData DVar;
+ if (Iter == Stack.rend() - 1) {
+ // OpenMP [2.9.1.1, Data-sharing Attribute Rules for Variables Referenced
+ // in a region but not in construct]
+ // File-scope or namespace-scope variables referenced in called routines
+ // in the region are shared unless they appear in a threadprivate
+ // directive.
+ // TODO
+ if (!D->isFunctionOrMethodVarDecl())
+ DVar.CKind = OMPC_shared;
+
+ // OpenMP [2.9.1.2, Data-sharing Attribute Rules for Variables Referenced
+ // in a region but not in construct]
+ // Variables with static storage duration that are declared in called
+ // routines in the region are shared.
+ if (D->hasGlobalStorage())
+ DVar.CKind = OMPC_shared;
+
+ return DVar;
+ }
+ DVar.DKind = Iter->Directive;
+ // Explicitly specified attributes and local variables with predetermined
+ // attributes.
+ if (Iter->SharingMap.count(D)) {
+ DVar.RefExpr = Iter->SharingMap[D].RefExpr;
+ DVar.CKind = Iter->SharingMap[D].Attributes;
+ return DVar;
+ }
+
+ // OpenMP [2.9.1.1, Data-sharing Attribute Rules for Variables Referenced
+ // in a Construct, C/C++, implicitly determined, p.1]
+ // In a parallel or task construct, the data-sharing attributes of these
+ // variables are determined by the default clause, if present.
+ switch (Iter->DefaultAttr) {
+ case DSA_shared:
+ DVar.CKind = OMPC_shared;
+ return DVar;
+ case DSA_none:
+ return DVar;
+ case DSA_unspecified:
+ // OpenMP [2.9.1.1, Data-sharing Attribute Rules for Variables Referenced
+ // in a Construct, implicitly determined, p.2]
+ // In a parallel construct, if no default clause is present, these
+ // variables are shared.
+ if (DVar.DKind == OMPD_parallel) {
+ DVar.CKind = OMPC_shared;
+ return DVar;
+ }
+
+ // OpenMP [2.9.1.1, Data-sharing Attribute Rules for Variables Referenced
+ // in a Construct, implicitly determined, p.4]
+ // In a task construct, if no default clause is present, a variable that in
+ // the enclosing context is determined to be shared by all implicit tasks
+ // bound to the current team is shared.
+ // TODO
+ if (DVar.DKind == OMPD_task) {
+ DSAVarData DVarTemp;
+ for (StackTy::reverse_iterator I = Iter + 1,
+ EE = Stack.rend() - 1;
+ I != EE; ++I) {
+ // OpenMP [2.9.1.1, Data-sharing Attribute Rules for Variables Referenced
+ // in a Construct, implicitly determined, p.6]
+ // In a task construct, if no default clause is present, a variable
+ // whose data-sharing attribute is not determined by the rules above is
+ // firstprivate.
+ DVarTemp = getDSA(I, D);
+ if (DVarTemp.CKind != OMPC_shared) {
+ DVar.RefExpr = 0;
+ DVar.DKind = OMPD_task;
+ DVar.CKind = OMPC_firstprivate;
+ return DVar;
+ }
+ if (I->Directive == OMPD_parallel) break;
+ }
+ DVar.DKind = OMPD_task;
+ DVar.CKind =
+ (DVarTemp.CKind == OMPC_unknown) ? OMPC_firstprivate : OMPC_shared;
+ return DVar;
+ }
+ }
+ // OpenMP [2.9.1.1, Data-sharing Attribute Rules for Variables Referenced
+ // in a Construct, implicitly determined, p.3]
+ // For constructs other than task, if no default clause is present, these
+ // variables inherit their data-sharing attributes from the enclosing
+ // context.
+ return getDSA(Iter + 1, D);
+}
+
+void DSAStackTy::addDSA(VarDecl *D, DeclRefExpr *E, OpenMPClauseKind A) {
+ if (A == OMPC_threadprivate) {
+ Stack[0].SharingMap[D].Attributes = A;
+ Stack[0].SharingMap[D].RefExpr = E;
+ } else {
+ assert(Stack.size() > 1 && "Data-sharing attributes stack is empty");
+ Stack.back().SharingMap[D].Attributes = A;
+ Stack.back().SharingMap[D].RefExpr = E;
+ }
+}
+
+bool DSAStackTy::isOpenMPLocal(VarDecl *D) {
+ Scope *CurScope = getCurScope();
+ while (CurScope && !CurScope->isDeclScope(D))
+ CurScope = CurScope->getParent();
+ while (CurScope && !CurScope->isOpenMPDirectiveScope())
+ CurScope = CurScope->getParent();
+ bool isOpenMPLocal = !!CurScope;
+ if (!isOpenMPLocal) {
+ CurScope = getCurScope();
+ while (CurScope && !CurScope->isOpenMPDirectiveScope())
+ CurScope = CurScope->getParent();
+ isOpenMPLocal =
+ CurScope &&
+ isa<CapturedDecl>(D->getDeclContext()) &&
+ CurScope->getFnParent()->getEntity()->Encloses(D->getDeclContext());
+ }
+ return isOpenMPLocal;
+}
+
+DSAStackTy::DSAVarData DSAStackTy::getTopDSA(VarDecl *D) {
+ DSAVarData DVar;
+
+ // OpenMP [2.9.1.1, Data-sharing Attribute Rules for Variables Referenced
+ // in a Construct, C/C++, predetermined, p.1]
+ // Variables appearing in threadprivate directives are threadprivate.
+ if (D->getTLSKind() != VarDecl::TLS_None) {
+ DVar.CKind = OMPC_threadprivate;
+ return DVar;
+ }
+ if (Stack[0].SharingMap.count(D)) {
+ DVar.RefExpr = Stack[0].SharingMap[D].RefExpr;
+ DVar.CKind = OMPC_threadprivate;
+ return DVar;
+ }
+
+ // OpenMP [2.9.1.1, Data-sharing Attribute Rules for Variables Referenced
+ // in a Construct, C/C++, predetermined, p.1]
+ // Variables with automatic storage duration that are declared in a scope
+ // inside the construct are private.
+ if (isOpenMPLocal(D) && D->isLocalVarDecl() &&
+ (D->getStorageClass() == SC_Auto ||
+ D->getStorageClass() == SC_None)) {
+ DVar.CKind = OMPC_private;
+ return DVar;
+ }
+
+ // OpenMP [2.9.1.1, Data-sharing Attribute Rules for Variables Referenced
+ // in a Construct, C/C++, predetermined, p.4]
+ // Static data memebers are shared.
+ if (D->isStaticDataMember()) {
+ // Variables with const-qualified type having no mutable member may be listed
+ // in a firstprivate clause, even if they are static data members.
+ DSAVarData DVarTemp = hasDSA(D, OMPC_firstprivate);
+ if (DVarTemp.CKind == OMPC_firstprivate && DVarTemp.RefExpr)
+ return DVar;
+
+ DVar.CKind = OMPC_shared;
+ return DVar;
+ }
+
+ QualType Type = D->getType().getNonReferenceType().getCanonicalType();
+ bool IsConstant = Type.isConstant(Actions.getASTContext());
+ while (Type->isArrayType()) {
+ QualType ElemType = cast<ArrayType>(Type.getTypePtr())->getElementType();
+ Type = ElemType.getNonReferenceType().getCanonicalType();
+ }
+ // OpenMP [2.9.1.1, Data-sharing Attribute Rules for Variables Referenced
+ // in a Construct, C/C++, predetermined, p.6]
+ // Variables with const qualified type having no mutable member are
+ // shared.
+ CXXRecordDecl *RD = Actions.getLangOpts().CPlusPlus ?
+ Type->getAsCXXRecordDecl() : 0;
+ if (IsConstant &&
+ !(Actions.getLangOpts().CPlusPlus && RD && RD->hasMutableFields())) {
+ // Variables with const-qualified type having no mutable member may be
+ // listed in a firstprivate clause, even if they are static data members.
+ DSAVarData DVarTemp = hasDSA(D, OMPC_firstprivate);
+ if (DVarTemp.CKind == OMPC_firstprivate && DVarTemp.RefExpr)
+ return DVar;
+
+ DVar.CKind = OMPC_shared;
+ return DVar;
+ }
+
+ // OpenMP [2.9.1.1, Data-sharing Attribute Rules for Variables Referenced
+ // in a Construct, C/C++, predetermined, p.7]
+ // Variables with static storage duration that are declared in a scope
+ // inside the construct are shared.
+ if (isOpenMPLocal(D) && D->isStaticLocal()) {
+ DVar.CKind = OMPC_shared;
+ return DVar;
+ }
+
+ // Explicitly specified attributes and local variables with predetermined
+ // attributes.
+ if (Stack.back().SharingMap.count(D)) {
+ DVar.RefExpr = Stack.back().SharingMap[D].RefExpr;
+ DVar.CKind = Stack.back().SharingMap[D].Attributes;
+ }
+
+ return DVar;
+}
+
+DSAStackTy::DSAVarData DSAStackTy::getImplicitDSA(VarDecl *D) {
+ return getDSA(Stack.rbegin() + 1, D);
+}
+
+DSAStackTy::DSAVarData DSAStackTy::hasDSA(VarDecl *D, OpenMPClauseKind CKind,
+ OpenMPDirectiveKind DKind) {
+ for (StackTy::reverse_iterator I = Stack.rbegin() + 1,
+ E = Stack.rend() - 1;
+ I != E; ++I) {
+ if (DKind != OMPD_unknown && DKind != I->Directive) continue;
+ DSAVarData DVar = getDSA(I, D);
+ if (DVar.CKind == CKind)
+ return DVar;
+ }
+ return DSAVarData();
+}
+
+void Sema::InitDataSharingAttributesStack() {
+ VarDataSharingAttributesStack = new DSAStackTy(*this);
+}
+
+#define DSAStack static_cast<DSAStackTy *>(VarDataSharingAttributesStack)
+
+void Sema::DestroyDataSharingAttributesStack() {
+ delete DSAStack;
+}
+
+void Sema::StartOpenMPDSABlock(OpenMPDirectiveKind DKind,
+ const DeclarationNameInfo &DirName,
+ Scope *CurScope) {
+ DSAStack->push(DKind, DirName, CurScope);
+ PushExpressionEvaluationContext(PotentiallyEvaluated);
+}
+
+void Sema::EndOpenMPDSABlock(Stmt *CurDirective) {
+ DSAStack->pop();
+ DiscardCleanupsInEvaluationContext();
+ PopExpressionEvaluationContext();
+}
+
+namespace {
+
+class VarDeclFilterCCC : public CorrectionCandidateCallback {
+private:
+ Sema &Actions;
+public:
+ VarDeclFilterCCC(Sema &S) : Actions(S) { }
+ virtual bool ValidateCandidate(const TypoCorrection &Candidate) {
+ NamedDecl *ND = Candidate.getCorrectionDecl();
+ if (VarDecl *VD = dyn_cast_or_null<VarDecl>(ND)) {
+ return VD->hasGlobalStorage() &&
+ Actions.isDeclInScope(ND, Actions.getCurLexicalContext(),
+ Actions.getCurScope());
+ }
+ return false;
+ }
+};
+}
+
+ExprResult Sema::ActOnOpenMPIdExpression(Scope *CurScope,
+ CXXScopeSpec &ScopeSpec,
+ const DeclarationNameInfo &Id) {
+ LookupResult Lookup(*this, Id, LookupOrdinaryName);
+ LookupParsedName(Lookup, CurScope, &ScopeSpec, true);
+
+ if (Lookup.isAmbiguous())
+ return ExprError();
+
+ VarDecl *VD;
+ if (!Lookup.isSingleResult()) {
+ VarDeclFilterCCC Validator(*this);
+ if (TypoCorrection Corrected = CorrectTypo(Id, LookupOrdinaryName, CurScope,
+ 0, Validator)) {
+ diagnoseTypo(Corrected,
+ PDiag(Lookup.empty()? diag::err_undeclared_var_use_suggest
+ : diag::err_omp_expected_var_arg_suggest)
+ << Id.getName());
+ VD = Corrected.getCorrectionDeclAs<VarDecl>();
+ } else {
+ Diag(Id.getLoc(), Lookup.empty() ? diag::err_undeclared_var_use
+ : diag::err_omp_expected_var_arg)
+ << Id.getName();
+ return ExprError();
+ }
+ } else {
+ if (!(VD = Lookup.getAsSingle<VarDecl>())) {
+ Diag(Id.getLoc(), diag::err_omp_expected_var_arg)
+ << Id.getName();
+ Diag(Lookup.getFoundDecl()->getLocation(), diag::note_declared_at);
+ return ExprError();
+ }
+ }
+ Lookup.suppressDiagnostics();
+
+ // OpenMP [2.9.2, Syntax, C/C++]
+ // Variables must be file-scope, namespace-scope, or static block-scope.
+ if (!VD->hasGlobalStorage()) {
+ Diag(Id.getLoc(), diag::err_omp_global_var_arg)
+ << getOpenMPDirectiveName(OMPD_threadprivate)
+ << !VD->isStaticLocal();
+ bool IsDecl = VD->isThisDeclarationADefinition(Context) ==
+ VarDecl::DeclarationOnly;
+ Diag(VD->getLocation(),
+ IsDecl ? diag::note_previous_decl : diag::note_defined_here) << VD;
+ return ExprError();
+ }
+
+ VarDecl *CanonicalVD = VD->getCanonicalDecl();
+ NamedDecl *ND = cast<NamedDecl>(CanonicalVD);
+ // OpenMP [2.9.2, Restrictions, C/C++, p.2]
+ // A threadprivate directive for file-scope variables must appear outside
+ // any definition or declaration.
+ if (CanonicalVD->getDeclContext()->isTranslationUnit() &&
+ !getCurLexicalContext()->isTranslationUnit()) {
+ Diag(Id.getLoc(), diag::err_omp_var_scope)
+ << getOpenMPDirectiveName(OMPD_threadprivate) << VD;
+ bool IsDecl = VD->isThisDeclarationADefinition(Context) ==
+ VarDecl::DeclarationOnly;
+ Diag(VD->getLocation(), IsDecl ? diag::note_previous_decl :
+ diag::note_defined_here) << VD;
+ return ExprError();
+ }
+ // OpenMP [2.9.2, Restrictions, C/C++, p.3]
+ // A threadprivate directive for static class member variables must appear
+ // in the class definition, in the same scope in which the member
+ // variables are declared.
+ if (CanonicalVD->isStaticDataMember() &&
+ !CanonicalVD->getDeclContext()->Equals(getCurLexicalContext())) {
+ Diag(Id.getLoc(), diag::err_omp_var_scope)
+ << getOpenMPDirectiveName(OMPD_threadprivate) << VD;
+ bool IsDecl = VD->isThisDeclarationADefinition(Context) ==
+ VarDecl::DeclarationOnly;
+ Diag(VD->getLocation(), IsDecl ? diag::note_previous_decl :
+ diag::note_defined_here) << VD;
+ return ExprError();
+ }
+ // OpenMP [2.9.2, Restrictions, C/C++, p.4]
+ // A threadprivate directive for namespace-scope variables must appear
+ // outside any definition or declaration other than the namespace
+ // definition itself.
+ if (CanonicalVD->getDeclContext()->isNamespace() &&
+ (!getCurLexicalContext()->isFileContext() ||
+ !getCurLexicalContext()->Encloses(CanonicalVD->getDeclContext()))) {
+ Diag(Id.getLoc(), diag::err_omp_var_scope)
+ << getOpenMPDirectiveName(OMPD_threadprivate) << VD;
+ bool IsDecl = VD->isThisDeclarationADefinition(Context) ==
+ VarDecl::DeclarationOnly;
+ Diag(VD->getLocation(), IsDecl ? diag::note_previous_decl :
+ diag::note_defined_here) << VD;
+ return ExprError();
+ }
+ // OpenMP [2.9.2, Restrictions, C/C++, p.6]
+ // A threadprivate directive for static block-scope variables must appear
+ // in the scope of the variable and not in a nested scope.
+ if (CanonicalVD->isStaticLocal() && CurScope &&
+ !isDeclInScope(ND, getCurLexicalContext(), CurScope)) {
+ Diag(Id.getLoc(), diag::err_omp_var_scope)
+ << getOpenMPDirectiveName(OMPD_threadprivate) << VD;
+ bool IsDecl = VD->isThisDeclarationADefinition(Context) ==
+ VarDecl::DeclarationOnly;
+ Diag(VD->getLocation(), IsDecl ? diag::note_previous_decl :
+ diag::note_defined_here) << VD;
+ return ExprError();
+ }
+
+ // OpenMP [2.9.2, Restrictions, C/C++, p.2-6]
+ // A threadprivate directive must lexically precede all references to any
+ // of the variables in its list.
+ if (VD->isUsed()) {
+ Diag(Id.getLoc(), diag::err_omp_var_used)
+ << getOpenMPDirectiveName(OMPD_threadprivate) << VD;
+ return ExprError();
+ }
+
+ QualType ExprType = VD->getType().getNonReferenceType();
+ ExprResult DE = BuildDeclRefExpr(VD, ExprType, VK_RValue, Id.getLoc());
+ DSAStack->addDSA(VD, cast<DeclRefExpr>(DE.get()), OMPC_threadprivate);
+ return DE;
+}
+
+Sema::DeclGroupPtrTy Sema::ActOnOpenMPThreadprivateDirective(
+ SourceLocation Loc,
+ ArrayRef<Expr *> VarList) {
+ if (OMPThreadPrivateDecl *D = CheckOMPThreadPrivateDecl(Loc, VarList)) {
+ CurContext->addDecl(D);
+ return DeclGroupPtrTy::make(DeclGroupRef(D));
+ }
+ return DeclGroupPtrTy();
+}
+
+OMPThreadPrivateDecl *Sema::CheckOMPThreadPrivateDecl(
+ SourceLocation Loc,
+ ArrayRef<Expr *> VarList) {
+ SmallVector<Expr *, 8> Vars;
+ for (ArrayRef<Expr *>::iterator I = VarList.begin(),
+ E = VarList.end();
+ I != E; ++I) {
+ DeclRefExpr *DE = cast<DeclRefExpr>(*I);
+ VarDecl *VD = cast<VarDecl>(DE->getDecl());
+ SourceLocation ILoc = DE->getExprLoc();
+
+ // OpenMP [2.9.2, Restrictions, C/C++, p.10]
+ // A threadprivate variable must not have an incomplete type.
+ if (RequireCompleteType(ILoc, VD->getType(),
+ diag::err_omp_threadprivate_incomplete_type)) {
+ continue;
+ }
+
+ // OpenMP [2.9.2, Restrictions, C/C++, p.10]
+ // A threadprivate variable must not have a reference type.
+ if (VD->getType()->isReferenceType()) {
+ Diag(ILoc, diag::err_omp_ref_type_arg)
+ << getOpenMPDirectiveName(OMPD_threadprivate)
+ << VD->getType();
+ bool IsDecl = VD->isThisDeclarationADefinition(Context) ==
+ VarDecl::DeclarationOnly;
+ Diag(VD->getLocation(), IsDecl ? diag::note_previous_decl :
+ diag::note_defined_here) << VD;
+ continue;
+ }
+
+ // Check if this is a TLS variable.
+ if (VD->getTLSKind()) {
+ Diag(ILoc, diag::err_omp_var_thread_local) << VD;
+ bool IsDecl = VD->isThisDeclarationADefinition(Context) ==
+ VarDecl::DeclarationOnly;
+ Diag(VD->getLocation(), IsDecl ? diag::note_previous_decl :
+ diag::note_defined_here) << VD;
+ continue;
+ }
+
+ Vars.push_back(*I);
+ }
+ return Vars.empty() ?
+ 0 : OMPThreadPrivateDecl::Create(Context,
+ getCurLexicalContext(),
+ Loc, Vars);
+}
+
+namespace {
+class DSAAttrChecker : public StmtVisitor<DSAAttrChecker, void> {
+ DSAStackTy *Stack;
+ Sema &Actions;
+ bool ErrorFound;
+ CapturedStmt *CS;
+ llvm::SmallVector<Expr *, 8> ImplicitFirstprivate;
+public:
+ void VisitDeclRefExpr(DeclRefExpr *E) {
+ if(VarDecl *VD = dyn_cast<VarDecl>(E->getDecl())) {
+ // Skip internally declared variables.
+ if (VD->isLocalVarDecl() && !CS->capturesVariable(VD)) return;
+
+ SourceLocation ELoc = E->getExprLoc();
+
+ OpenMPDirectiveKind DKind = Stack->getCurrentDirective();
+ DSAStackTy::DSAVarData DVar = Stack->getTopDSA(VD);
+ if (DVar.CKind != OMPC_unknown) {
+ if (DKind == OMPD_task && DVar.CKind != OMPC_shared &&
+ DVar.CKind != OMPC_threadprivate && !DVar.RefExpr)
+ ImplicitFirstprivate.push_back(DVar.RefExpr);
+ return;
+ }
+ // The default(none) clause requires that each variable that is referenced
+ // in the construct, and does not have a predetermined data-sharing
+ // attribute, must have its data-sharing attribute explicitly determined
+ // by being listed in a data-sharing attribute clause.
+ if (DVar.CKind == OMPC_unknown && Stack->getDefaultDSA() == DSA_none &&
+ (DKind == OMPD_parallel || DKind == OMPD_task)) {
+ ErrorFound = true;
+ Actions.Diag(ELoc, diag::err_omp_no_dsa_for_variable) << VD;
+ return;
+ }
+
+ // OpenMP [2.9.3.6, Restrictions, p.2]
+ // A list item that appears in a reduction clause of the innermost
+ // enclosing worksharing or parallel construct may not be accessed in an
+ // explicit task.
+ // TODO:
+
+ // Define implicit data-sharing attributes for task.
+ DVar = Stack->getImplicitDSA(VD);
+ if (DKind == OMPD_task && DVar.CKind != OMPC_shared)
+ ImplicitFirstprivate.push_back(DVar.RefExpr);
+ }
+ }
+ void VisitOMPExecutableDirective(OMPExecutableDirective *S) {
+ for (ArrayRef<OMPClause *>::iterator I = S->clauses().begin(),
+ E = S->clauses().end();
+ I != E; ++I)
+ if (OMPClause *C = *I)
+ for (StmtRange R = C->children(); R; ++R)
+ if (Stmt *Child = *R)
+ Visit(Child);
+ }
+ void VisitStmt(Stmt *S) {
+ for (Stmt::child_iterator I = S->child_begin(), E = S->child_end();
+ I != E; ++I)
+ if (Stmt *Child = *I)
+ if (!isa<OMPExecutableDirective>(Child))
+ Visit(Child);
+ }
+
+ bool isErrorFound() { return ErrorFound; }
+ ArrayRef<Expr *> getImplicitFirstprivate() { return ImplicitFirstprivate; }
+
+ DSAAttrChecker(DSAStackTy *S, Sema &Actions, CapturedStmt *CS)
+ : Stack(S), Actions(Actions), ErrorFound(false), CS(CS) { }
+};
+}
+
+StmtResult Sema::ActOnOpenMPExecutableDirective(OpenMPDirectiveKind Kind,
+ ArrayRef<OMPClause *> Clauses,
+ Stmt *AStmt,
+ SourceLocation StartLoc,
+ SourceLocation EndLoc) {
+ assert(AStmt && isa<CapturedStmt>(AStmt) && "Captured statement expected");
+
+ StmtResult Res = StmtError();
+
+ // Check default data sharing attributes for referenced variables.
+ DSAAttrChecker DSAChecker(DSAStack, *this, cast<CapturedStmt>(AStmt));
+ DSAChecker.Visit(cast<CapturedStmt>(AStmt)->getCapturedStmt());
+ if (DSAChecker.isErrorFound())
+ return StmtError();
+ // Generate list of implicitly defined firstprivate variables.
+ llvm::SmallVector<OMPClause *, 8> ClausesWithImplicit;
+ ClausesWithImplicit.append(Clauses.begin(), Clauses.end());
+
+ bool ErrorFound = false;
+ if (!DSAChecker.getImplicitFirstprivate().empty()) {
+ if (OMPClause *Implicit =
+ ActOnOpenMPFirstprivateClause(DSAChecker.getImplicitFirstprivate(),
+ SourceLocation(), SourceLocation(),
+ SourceLocation())) {
+ ClausesWithImplicit.push_back(Implicit);
+ ErrorFound = cast<OMPFirstprivateClause>(Implicit)->varlist_size() !=
+ DSAChecker.getImplicitFirstprivate().size();
+ } else
+ ErrorFound = true;
+ }
+
+ switch (Kind) {
+ case OMPD_parallel:
+ Res = ActOnOpenMPParallelDirective(ClausesWithImplicit, AStmt,
+ StartLoc, EndLoc);
+ break;
+ case OMPD_threadprivate:
+ case OMPD_task:
+ llvm_unreachable("OpenMP Directive is not allowed");
+ case OMPD_unknown:
+ case NUM_OPENMP_DIRECTIVES:
+ llvm_unreachable("Unknown OpenMP directive");
+ }
+
+ if (ErrorFound) return StmtError();
+ return Res;
+}
+
+StmtResult Sema::ActOnOpenMPParallelDirective(ArrayRef<OMPClause *> Clauses,
+ Stmt *AStmt,
+ SourceLocation StartLoc,
+ SourceLocation EndLoc) {
+ getCurFunction()->setHasBranchProtectedScope();
+
+ return Owned(OMPParallelDirective::Create(Context, StartLoc, EndLoc,
+ Clauses, AStmt));
+}
+
+OMPClause *Sema::ActOnOpenMPSimpleClause(OpenMPClauseKind Kind,
+ unsigned Argument,
+ SourceLocation ArgumentLoc,
+ SourceLocation StartLoc,
+ SourceLocation LParenLoc,
+ SourceLocation EndLoc) {
+ OMPClause *Res = 0;
+ switch (Kind) {
+ case OMPC_default:
+ Res =
+ ActOnOpenMPDefaultClause(static_cast<OpenMPDefaultClauseKind>(Argument),
+ ArgumentLoc, StartLoc, LParenLoc, EndLoc);
+ break;
+ case OMPC_private:
+ case OMPC_firstprivate:
+ case OMPC_shared:
+ case OMPC_threadprivate:
+ case OMPC_unknown:
+ case NUM_OPENMP_CLAUSES:
+ llvm_unreachable("Clause is not allowed.");
+ }
+ return Res;
+}
+
+OMPClause *Sema::ActOnOpenMPDefaultClause(OpenMPDefaultClauseKind Kind,
+ SourceLocation KindKwLoc,
+ SourceLocation StartLoc,
+ SourceLocation LParenLoc,
+ SourceLocation EndLoc) {
+ if (Kind == OMPC_DEFAULT_unknown) {
+ std::string Values;
+ std::string Sep(NUM_OPENMP_DEFAULT_KINDS > 1 ? ", " : "");
+ for (unsigned i = OMPC_DEFAULT_unknown + 1;
+ i < NUM_OPENMP_DEFAULT_KINDS; ++i) {
+ Values += "'";
+ Values += getOpenMPSimpleClauseTypeName(OMPC_default, i);
+ Values += "'";
+ switch (i) {
+ case NUM_OPENMP_DEFAULT_KINDS - 2:
+ Values += " or ";
+ break;
+ case NUM_OPENMP_DEFAULT_KINDS - 1:
+ break;
+ default:
+ Values += Sep;
+ break;
+ }
+ }
+ Diag(KindKwLoc, diag::err_omp_unexpected_clause_value)
+ << Values << getOpenMPClauseName(OMPC_default);
+ return 0;
+ }
+ switch (Kind) {
+ case OMPC_DEFAULT_none:
+ DSAStack->setDefaultDSANone();
+ break;
+ case OMPC_DEFAULT_shared:
+ DSAStack->setDefaultDSAShared();
+ break;
+ default:
+ break;
+ }
+ return new (Context) OMPDefaultClause(Kind, KindKwLoc, StartLoc, LParenLoc,
+ EndLoc);
+}
+
+OMPClause *Sema::ActOnOpenMPVarListClause(OpenMPClauseKind Kind,
+ ArrayRef<Expr *> VarList,
+ SourceLocation StartLoc,
+ SourceLocation LParenLoc,
+ SourceLocation EndLoc) {
+ OMPClause *Res = 0;
+ switch (Kind) {
+ case OMPC_private:
+ Res = ActOnOpenMPPrivateClause(VarList, StartLoc, LParenLoc, EndLoc);
+ break;
+ case OMPC_firstprivate:
+ Res = ActOnOpenMPFirstprivateClause(VarList, StartLoc, LParenLoc, EndLoc);
+ break;
+ case OMPC_shared:
+ Res = ActOnOpenMPSharedClause(VarList, StartLoc, LParenLoc, EndLoc);
+ break;
+ case OMPC_default:
+ case OMPC_threadprivate:
+ case OMPC_unknown:
+ case NUM_OPENMP_CLAUSES:
+ llvm_unreachable("Clause is not allowed.");
+ }
+ return Res;
+}
+
+OMPClause *Sema::ActOnOpenMPPrivateClause(ArrayRef<Expr *> VarList,
+ SourceLocation StartLoc,
+ SourceLocation LParenLoc,
+ SourceLocation EndLoc) {
+ SmallVector<Expr *, 8> Vars;
+ for (ArrayRef<Expr *>::iterator I = VarList.begin(), E = VarList.end();
+ I != E; ++I) {
+ assert(*I && "NULL expr in OpenMP private clause.");
+ if (isa<DependentScopeDeclRefExpr>(*I)) {
+ // It will be analyzed later.
+ Vars.push_back(*I);
+ continue;
+ }
+
+ SourceLocation ELoc = (*I)->getExprLoc();
+ // OpenMP [2.1, C/C++]
+ // A list item is a variable name.
+ // OpenMP [2.9.3.3, Restrictions, p.1]
+ // A variable that is part of another variable (as an array or
+ // structure element) cannot appear in a private clause.
+ DeclRefExpr *DE = dyn_cast_or_null<DeclRefExpr>(*I);
+ if (!DE || !isa<VarDecl>(DE->getDecl())) {
+ Diag(ELoc, diag::err_omp_expected_var_name)
+ << (*I)->getSourceRange();
+ continue;
+ }
+ Decl *D = DE->getDecl();
+ VarDecl *VD = cast<VarDecl>(D);
+
+ QualType Type = VD->getType();
+ if (Type->isDependentType() || Type->isInstantiationDependentType()) {
+ // It will be analyzed later.
+ Vars.push_back(DE);
+ continue;
+ }
+
+ // OpenMP [2.9.3.3, Restrictions, C/C++, p.3]
+ // A variable that appears in a private clause must not have an incomplete
+ // type or a reference type.
+ if (RequireCompleteType(ELoc, Type,
+ diag::err_omp_private_incomplete_type)) {
+ continue;
+ }
+ if (Type->isReferenceType()) {
+ Diag(ELoc, diag::err_omp_clause_ref_type_arg)
+ << getOpenMPClauseName(OMPC_private) << Type;
+ bool IsDecl = VD->isThisDeclarationADefinition(Context) ==
+ VarDecl::DeclarationOnly;
+ Diag(VD->getLocation(), IsDecl ? diag::note_previous_decl :
+ diag::note_defined_here) << VD;
+ continue;
+ }
+
+ // OpenMP [2.9.3.3, Restrictions, C/C++, p.1]
+ // A variable of class type (or array thereof) that appears in a private
+ // clause requires an accesible, unambiguous default constructor for the
+ // class type.
+ while (Type.getNonReferenceType()->isArrayType()) {
+ Type = cast<ArrayType>(
+ Type.getNonReferenceType().getTypePtr())->getElementType();
+ }
+ CXXRecordDecl *RD = getLangOpts().CPlusPlus ?
+ Type.getNonReferenceType()->getAsCXXRecordDecl() : 0;
+ if (RD) {
+ CXXConstructorDecl *CD = LookupDefaultConstructor(RD);
+ PartialDiagnostic PD =
+ PartialDiagnostic(PartialDiagnostic::NullDiagnostic());
+ if (!CD ||
+ CheckConstructorAccess(ELoc, CD,
+ InitializedEntity::InitializeTemporary(Type),
+ CD->getAccess(), PD) == AR_inaccessible ||
+ CD->isDeleted()) {
+ Diag(ELoc, diag::err_omp_required_method)
+ << getOpenMPClauseName(OMPC_private) << 0;
+ bool IsDecl = VD->isThisDeclarationADefinition(Context) ==
+ VarDecl::DeclarationOnly;
+ Diag(VD->getLocation(), IsDecl ? diag::note_previous_decl :
+ diag::note_defined_here) << VD;
+ Diag(RD->getLocation(), diag::note_previous_decl) << RD;
+ continue;
+ }
+ MarkFunctionReferenced(ELoc, CD);
+ DiagnoseUseOfDecl(CD, ELoc);
+
+ CXXDestructorDecl *DD = RD->getDestructor();
+ if (DD) {
+ if (CheckDestructorAccess(ELoc, DD, PD) == AR_inaccessible ||
+ DD->isDeleted()) {
+ Diag(ELoc, diag::err_omp_required_method)
+ << getOpenMPClauseName(OMPC_private) << 4;
+ bool IsDecl = VD->isThisDeclarationADefinition(Context) ==
+ VarDecl::DeclarationOnly;
+ Diag(VD->getLocation(), IsDecl ? diag::note_previous_decl :
+ diag::note_defined_here) << VD;
+ Diag(RD->getLocation(), diag::note_previous_decl) << RD;
+ continue;
+ }
+ MarkFunctionReferenced(ELoc, DD);
+ DiagnoseUseOfDecl(DD, ELoc);
+ }
+ }
+
+ // OpenMP [2.9.1.1, Data-sharing Attribute Rules for Variables Referenced
+ // in a Construct]
+ // Variables with the predetermined data-sharing attributes may not be
+ // listed in data-sharing attributes clauses, except for the cases
+ // listed below. For these exceptions only, listing a predetermined
+ // variable in a data-sharing attribute clause is allowed and overrides
+ // the variable's predetermined data-sharing attributes.
+ DSAStackTy::DSAVarData DVar = DSAStack->getTopDSA(VD);
+ if (DVar.CKind != OMPC_unknown && DVar.CKind != OMPC_private) {
+ Diag(ELoc, diag::err_omp_wrong_dsa)
+ << getOpenMPClauseName(DVar.CKind)
+ << getOpenMPClauseName(OMPC_private);
+ if (DVar.RefExpr) {
+ Diag(DVar.RefExpr->getExprLoc(), diag::note_omp_explicit_dsa)
+ << getOpenMPClauseName(DVar.CKind);
+ } else {
+ Diag(VD->getLocation(), diag::note_omp_predetermined_dsa)
+ << getOpenMPClauseName(DVar.CKind);
+ }
+ continue;
+ }
+
+ DSAStack->addDSA(VD, DE, OMPC_private);
+ Vars.push_back(DE);
+ }
+
+ if (Vars.empty()) return 0;
+
+ return OMPPrivateClause::Create(Context, StartLoc, LParenLoc, EndLoc, Vars);
+}
+
+OMPClause *Sema::ActOnOpenMPFirstprivateClause(ArrayRef<Expr *> VarList,
+ SourceLocation StartLoc,
+ SourceLocation LParenLoc,
+ SourceLocation EndLoc) {
+ SmallVector<Expr *, 8> Vars;
+ for (ArrayRef<Expr *>::iterator I = VarList.begin(), E = VarList.end();
+ I != E; ++I) {
+ assert(*I && "NULL expr in OpenMP firstprivate clause.");
+ if (isa<DependentScopeDeclRefExpr>(*I)) {
+ // It will be analyzed later.
+ Vars.push_back(*I);
+ continue;
+ }
+
+ SourceLocation ELoc = (*I)->getExprLoc();
+ // OpenMP [2.1, C/C++]
+ // A list item is a variable name.
+ // OpenMP [2.9.3.3, Restrictions, p.1]
+ // A variable that is part of another variable (as an array or
+ // structure element) cannot appear in a private clause.
+ DeclRefExpr *DE = dyn_cast_or_null<DeclRefExpr>(*I);
+ if (!DE || !isa<VarDecl>(DE->getDecl())) {
+ Diag(ELoc, diag::err_omp_expected_var_name)
+ << (*I)->getSourceRange();
+ continue;
+ }
+ Decl *D = DE->getDecl();
+ VarDecl *VD = cast<VarDecl>(D);
+
+ QualType Type = VD->getType();
+ if (Type->isDependentType() || Type->isInstantiationDependentType()) {
+ // It will be analyzed later.
+ Vars.push_back(DE);
+ continue;
+ }
+
+ // OpenMP [2.9.3.3, Restrictions, C/C++, p.3]
+ // A variable that appears in a private clause must not have an incomplete
+ // type or a reference type.
+ if (RequireCompleteType(ELoc, Type,
+ diag::err_omp_firstprivate_incomplete_type)) {
+ continue;
+ }
+ if (Type->isReferenceType()) {
+ Diag(ELoc, diag::err_omp_clause_ref_type_arg)
+ << getOpenMPClauseName(OMPC_firstprivate) << Type;
+ bool IsDecl = VD->isThisDeclarationADefinition(Context) ==
+ VarDecl::DeclarationOnly;
+ Diag(VD->getLocation(), IsDecl ? diag::note_previous_decl :
+ diag::note_defined_here) << VD;
+ continue;
+ }
+
+ // OpenMP [2.9.3.4, Restrictions, C/C++, p.1]
+ // A variable of class type (or array thereof) that appears in a private
+ // clause requires an accesible, unambiguous copy constructor for the
+ // class type.
+ Type = Context.getBaseElementType(Type);
+ CXXRecordDecl *RD = getLangOpts().CPlusPlus ?
+ Type.getNonReferenceType()->getAsCXXRecordDecl() : 0;
+ if (RD) {
+ CXXConstructorDecl *CD = LookupCopyingConstructor(RD, 0);
+ PartialDiagnostic PD =
+ PartialDiagnostic(PartialDiagnostic::NullDiagnostic());
+ if (!CD ||
+ CheckConstructorAccess(ELoc, CD,
+ InitializedEntity::InitializeTemporary(Type),
+ CD->getAccess(), PD) == AR_inaccessible ||
+ CD->isDeleted()) {
+ Diag(ELoc, diag::err_omp_required_method)
+ << getOpenMPClauseName(OMPC_firstprivate) << 1;
+ bool IsDecl = VD->isThisDeclarationADefinition(Context) ==
+ VarDecl::DeclarationOnly;
+ Diag(VD->getLocation(), IsDecl ? diag::note_previous_decl :
+ diag::note_defined_here) << VD;
+ Diag(RD->getLocation(), diag::note_previous_decl) << RD;
+ continue;
+ }
+ MarkFunctionReferenced(ELoc, CD);
+ DiagnoseUseOfDecl(CD, ELoc);
+
+ CXXDestructorDecl *DD = RD->getDestructor();
+ if (DD) {
+ if (CheckDestructorAccess(ELoc, DD, PD) == AR_inaccessible ||
+ DD->isDeleted()) {
+ Diag(ELoc, diag::err_omp_required_method)
+ << getOpenMPClauseName(OMPC_firstprivate) << 4;
+ bool IsDecl = VD->isThisDeclarationADefinition(Context) ==
+ VarDecl::DeclarationOnly;
+ Diag(VD->getLocation(), IsDecl ? diag::note_previous_decl :
+ diag::note_defined_here) << VD;
+ Diag(RD->getLocation(), diag::note_previous_decl) << RD;
+ continue;
+ }
+ MarkFunctionReferenced(ELoc, DD);
+ DiagnoseUseOfDecl(DD, ELoc);
+ }
+ }
+
+ // If StartLoc and EndLoc are invalid - this is an implicit firstprivate
+ // variable and it was checked already.
+ if (StartLoc.isValid() && EndLoc.isValid()) {
+ DSAStackTy::DSAVarData DVar = DSAStack->getTopDSA(VD);
+ Type = Type.getNonReferenceType().getCanonicalType();
+ bool IsConstant = Type.isConstant(Context);
+ Type = Context.getBaseElementType(Type);
+ // OpenMP [2.4.13, Data-sharing Attribute Clauses]
+ // A list item that specifies a given variable may not appear in more
+ // than one clause on the same directive, except that a variable may be
+ // specified in both firstprivate and lastprivate clauses.
+ // TODO: add processing for lastprivate.
+ if (DVar.CKind != OMPC_unknown && DVar.CKind != OMPC_firstprivate &&
+ DVar.RefExpr) {
+ Diag(ELoc, diag::err_omp_wrong_dsa)
+ << getOpenMPClauseName(DVar.CKind)
+ << getOpenMPClauseName(OMPC_firstprivate);
+ Diag(DVar.RefExpr->getExprLoc(), diag::note_omp_explicit_dsa)
+ << getOpenMPClauseName(DVar.CKind);
+ continue;
+ }
+
+ // OpenMP [2.9.1.1, Data-sharing Attribute Rules for Variables Referenced
+ // in a Construct]
+ // Variables with the predetermined data-sharing attributes may not be
+ // listed in data-sharing attributes clauses, except for the cases
+ // listed below. For these exceptions only, listing a predetermined
+ // variable in a data-sharing attribute clause is allowed and overrides
+ // the variable's predetermined data-sharing attributes.
+ // OpenMP [2.9.1.1, Data-sharing Attribute Rules for Variables Referenced
+ // in a Construct, C/C++, p.2]
+ // Variables with const-qualified type having no mutable member may be
+ // listed in a firstprivate clause, even if they are static data members.
+ if (!(IsConstant || VD->isStaticDataMember()) && !DVar.RefExpr &&
+ DVar.CKind != OMPC_unknown && DVar.CKind != OMPC_shared) {
+ Diag(ELoc, diag::err_omp_wrong_dsa)
+ << getOpenMPClauseName(DVar.CKind)
+ << getOpenMPClauseName(OMPC_firstprivate);
+ Diag(VD->getLocation(), diag::note_omp_predetermined_dsa)
+ << getOpenMPClauseName(DVar.CKind);
+ continue;
+ }
+
+ // OpenMP [2.9.3.4, Restrictions, p.2]
+ // A list item that is private within a parallel region must not appear
+ // in a firstprivate clause on a worksharing construct if any of the
+ // worksharing regions arising from the worksharing construct ever bind
+ // to any of the parallel regions arising from the parallel construct.
+ // OpenMP [2.9.3.4, Restrictions, p.3]
+ // A list item that appears in a reduction clause of a parallel construct
+ // must not appear in a firstprivate clause on a worksharing or task
+ // construct if any of the worksharing or task regions arising from the
+ // worksharing or task construct ever bind to any of the parallel regions
+ // arising from the parallel construct.
+ // OpenMP [2.9.3.4, Restrictions, p.4]
+ // A list item that appears in a reduction clause in worksharing
+ // construct must not appear in a firstprivate clause in a task construct
+ // encountered during execution of any of the worksharing regions arising
+ // from the worksharing construct.
+ // TODO:
+ }
+
+ DSAStack->addDSA(VD, DE, OMPC_firstprivate);
+ Vars.push_back(DE);
+ }
+
+ if (Vars.empty()) return 0;
+
+ return OMPFirstprivateClause::Create(Context, StartLoc, LParenLoc, EndLoc,
+ Vars);
+}
+
+OMPClause *Sema::ActOnOpenMPSharedClause(ArrayRef<Expr *> VarList,
+ SourceLocation StartLoc,
+ SourceLocation LParenLoc,
+ SourceLocation EndLoc) {
+ SmallVector<Expr *, 8> Vars;
+ for (ArrayRef<Expr *>::iterator I = VarList.begin(), E = VarList.end();
+ I != E; ++I) {
+ assert(*I && "NULL expr in OpenMP shared clause.");
+ if (isa<DependentScopeDeclRefExpr>(*I)) {
+ // It will be analyzed later.
+ Vars.push_back(*I);
+ continue;
+ }
+
+ SourceLocation ELoc = (*I)->getExprLoc();
+ // OpenMP [2.1, C/C++]
+ // A list item is a variable name.
+ // OpenMP [2.9.3.4, Restrictions, p.1]
+ // A variable that is part of another variable (as an array or
+ // structure element) cannot appear in a private clause.
+ DeclRefExpr *DE = dyn_cast<DeclRefExpr>(*I);
+ if (!DE || !isa<VarDecl>(DE->getDecl())) {
+ Diag(ELoc, diag::err_omp_expected_var_name)
+ << (*I)->getSourceRange();
+ continue;
+ }
+ Decl *D = DE->getDecl();
+ VarDecl *VD = cast<VarDecl>(D);
+
+ QualType Type = VD->getType();
+ if (Type->isDependentType() || Type->isInstantiationDependentType()) {
+ // It will be analyzed later.
+ Vars.push_back(DE);
+ continue;
+ }
+
+ // OpenMP [2.9.1.1, Data-sharing Attribute Rules for Variables Referenced
+ // in a Construct]
+ // Variables with the predetermined data-sharing attributes may not be
+ // listed in data-sharing attributes clauses, except for the cases
+ // listed below. For these exceptions only, listing a predetermined
+ // variable in a data-sharing attribute clause is allowed and overrides
+ // the variable's predetermined data-sharing attributes.
+ DSAStackTy::DSAVarData DVar = DSAStack->getTopDSA(VD);
+ if (DVar.CKind != OMPC_unknown && DVar.CKind != OMPC_shared && DVar.RefExpr) {
+ Diag(ELoc, diag::err_omp_wrong_dsa)
+ << getOpenMPClauseName(DVar.CKind)
+ << getOpenMPClauseName(OMPC_shared);
+ Diag(DVar.RefExpr->getExprLoc(), diag::note_omp_explicit_dsa)
+ << getOpenMPClauseName(DVar.CKind);
+ continue;
+ }
+
+ DSAStack->addDSA(VD, DE, OMPC_shared);
+ Vars.push_back(DE);
+ }
+
+ if (Vars.empty()) return 0;
+
+ return OMPSharedClause::Create(Context, StartLoc, LParenLoc, EndLoc, Vars);
+}
+
+#undef DSAStack
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