[OPENMP] 'if' clause support (no CodeGen support)

llvm-svn: 201297

8 files changed, 142 insertions, 6 deletions

diff --git a/clang/lib/AST/StmtPrinter.cpp b/clang/lib/AST/StmtPrinter.cpp
index f008a120757..8ed2987e6dd 100644
--- a/clang/lib/AST/StmtPrinter.cpp
+++ b/clang/lib/AST/StmtPrinter.cpp
@@ -593,16 +593,24 @@ void StmtPrinter::VisitSEHFinallyStmt(SEHFinallyStmt *Node) {
 namespace {
 class OMPClausePrinter : public OMPClauseVisitor<OMPClausePrinter> {
   raw_ostream &OS;
+  const PrintingPolicy &Policy;
   /// \brief Process clauses with list of variables.
   template <typename T>
   void VisitOMPClauseList(T *Node, char StartSym);
 public:
-  OMPClausePrinter(raw_ostream &OS) : OS(OS) { }
+  OMPClausePrinter(raw_ostream &OS, const PrintingPolicy &Policy)
+    : OS(OS), Policy(Policy) { }
 #define OPENMP_CLAUSE(Name, Class)                              \
   void Visit##Class(Class *S);
 #include "clang/Basic/OpenMPKinds.def"
 };
 
+void OMPClausePrinter::VisitOMPIfClause(OMPIfClause *Node) {
+  OS << "if(";
+  Node->getCondition()->printPretty(OS, 0, Policy, 0);
+  OS << ")";
+}
+
 void OMPClausePrinter::VisitOMPDefaultClause(OMPDefaultClause *Node) {
   OS << "default("
      << getOpenMPSimpleClauseTypeName(OMPC_default, Node->getDefaultKind())
@@ -651,7 +659,7 @@ void OMPClausePrinter::VisitOMPSharedClause(OMPSharedClause *Node) {
 void StmtPrinter::VisitOMPParallelDirective(OMPParallelDirective *Node) {
   Indent() << "#pragma omp parallel ";
 
-  OMPClausePrinter Printer(OS);
+  OMPClausePrinter Printer(OS, Policy);
   ArrayRef<OMPClause *> Clauses = Node->clauses();
   for (ArrayRef<OMPClause *>::iterator I = Clauses.begin(), E = Clauses.end();
        I != E; ++I)
diff --git a/clang/lib/AST/StmtProfile.cpp b/clang/lib/AST/StmtProfile.cpp
index f1996e3882e..ae3b3600786 100644
--- a/clang/lib/AST/StmtProfile.cpp
+++ b/clang/lib/AST/StmtProfile.cpp
@@ -265,6 +265,11 @@ public:
 #include "clang/Basic/OpenMPKinds.def"
 };
 
+void OMPClauseProfiler::VisitOMPIfClause(const OMPIfClause *C) {
+  if (C->getCondition())
+    Profiler->VisitStmt(C->getCondition());
+}
+
 void OMPClauseProfiler::VisitOMPDefaultClause(const OMPDefaultClause *C) { }
 
 template<typename T>
diff --git a/clang/lib/Basic/OpenMPKinds.cpp b/clang/lib/Basic/OpenMPKinds.cpp
index 1350934d0e6..4e0ab1298b4 100644
--- a/clang/lib/Basic/OpenMPKinds.cpp
+++ b/clang/lib/Basic/OpenMPKinds.cpp
@@ -77,6 +77,7 @@ unsigned clang::getOpenMPSimpleClauseType(OpenMPClauseKind Kind,
              .Default(OMPC_DEFAULT_unknown);
   case OMPC_unknown:
   case OMPC_threadprivate:
+  case OMPC_if:
   case OMPC_private:
   case OMPC_firstprivate:
   case OMPC_shared:
@@ -100,6 +101,7 @@ const char *clang::getOpenMPSimpleClauseTypeName(OpenMPClauseKind Kind,
     llvm_unreachable("Invalid OpenMP 'default' clause type");
   case OMPC_unknown:
   case OMPC_threadprivate:
+  case OMPC_if:
   case OMPC_private:
   case OMPC_firstprivate:
   case OMPC_shared:
diff --git a/clang/lib/Parse/ParseOpenMP.cpp b/clang/lib/Parse/ParseOpenMP.cpp
index 9053407a5f0..b3c7cb597e4 100644
--- a/clang/lib/Parse/ParseOpenMP.cpp
+++ b/clang/lib/Parse/ParseOpenMP.cpp
@@ -269,10 +269,20 @@ OMPClause *Parser::ParseOpenMPClause(OpenMPDirectiveKind DKind,
   }
 
   switch (CKind) {
+  case OMPC_if:
+    // OpenMP [2.5, Restrictions]
+    //  At most one if clause can appear on the directive.
+    if (!FirstClause) {
+      Diag(Tok, diag::err_omp_more_one_clause)
+           << getOpenMPDirectiveName(DKind) << getOpenMPClauseName(CKind);
+    }
+
+    Clause = ParseOpenMPSingleExprClause(CKind);
+    break;
   case OMPC_default:
-    // OpenMP [2.9.3.1, Restrictions]
-    //  Only a single default clause may be specified on a parallel or task
-    //  directive.
+    // OpenMP [2.14.3.1, Restrictions]
+    //  Only a single default clause may be specified on a parallel, task or
+    //  teams directive.
     if (!FirstClause) {
       Diag(Tok, diag::err_omp_more_one_clause)
            << getOpenMPDirectiveName(DKind) << getOpenMPClauseName(CKind);
@@ -300,6 +310,39 @@ OMPClause *Parser::ParseOpenMPClause(OpenMPDirectiveKind DKind,
   return ErrorFound ? 0 : Clause;
 }
 
+/// \brief Parsing of OpenMP clauses with single expressions like 'if',
+/// 'collapse', 'safelen', 'num_threads', 'simdlen', 'num_teams' or
+/// 'thread_limit'.
+///
+///    if-clause:
+///      'if' '(' expression ')'
+///
+OMPClause *Parser::ParseOpenMPSingleExprClause(OpenMPClauseKind Kind) {
+  SourceLocation Loc = ConsumeToken();
+
+  BalancedDelimiterTracker T(*this, tok::l_paren, tok::annot_pragma_openmp_end);
+  if (T.expectAndConsume(diag::err_expected_lparen_after,
+                         getOpenMPClauseName(Kind)))
+    return 0;
+
+  ExprResult LHS(ParseCastExpression(false, false, NotTypeCast));
+  ExprResult Val(ParseRHSOfBinaryExpression(LHS, prec::Conditional));
+
+  if (Tok.isNot(tok::r_paren) && Tok.isNot(tok::comma) &&
+      Tok.isNot(tok::annot_pragma_openmp_end))
+    ConsumeAnyToken();
+
+  // Parse ')'.
+  T.consumeClose();
+
+  if (Val.isInvalid())
+    return 0;
+
+  return Actions.ActOnOpenMPSingleExprClause(Kind, Val.take(), Loc,
+                                             T.getOpenLocation(),
+                                             T.getCloseLocation());
+}
+
 /// \brief Parsing of simple OpenMP clauses like 'default'.
 ///
 ///    default-clause:
diff --git a/clang/lib/Sema/SemaOpenMP.cpp b/clang/lib/Sema/SemaOpenMP.cpp
index 0ca7d567449..fee9b1d2ce4 100644
--- a/clang/lib/Sema/SemaOpenMP.cpp
+++ b/clang/lib/Sema/SemaOpenMP.cpp
@@ -721,6 +721,48 @@ StmtResult Sema::ActOnOpenMPParallelDirective(ArrayRef<OMPClause *> Clauses,
                                             Clauses, AStmt));
 }
 
+OMPClause *Sema::ActOnOpenMPSingleExprClause(OpenMPClauseKind Kind,
+                                             Expr *Expr,
+                                             SourceLocation StartLoc,
+                                             SourceLocation LParenLoc,
+                                             SourceLocation EndLoc) {
+  OMPClause *Res = 0;
+  switch (Kind) {
+  case OMPC_if:
+    Res = ActOnOpenMPIfClause(Expr, StartLoc, LParenLoc, EndLoc);
+    break;
+  case OMPC_default:
+  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::ActOnOpenMPIfClause(Expr *Condition,
+                                     SourceLocation StartLoc,
+                                     SourceLocation LParenLoc,
+                                     SourceLocation EndLoc) {
+  Expr *ValExpr = Condition;
+  if (!Condition->isValueDependent() && !Condition->isTypeDependent() &&
+      !Condition->isInstantiationDependent() &&
+      !Condition->containsUnexpandedParameterPack()) {
+    ExprResult Val = ActOnBooleanCondition(DSAStack->getCurScope(),
+                                           Condition->getExprLoc(),
+                                           Condition);
+    if (Val.isInvalid())
+      return 0;
+
+    ValExpr = Val.take();
+  }
+
+  return new (Context) OMPIfClause(ValExpr, StartLoc, LParenLoc, EndLoc);
+}
+
 OMPClause *Sema::ActOnOpenMPSimpleClause(OpenMPClauseKind Kind,
                                          unsigned Argument,
                                          SourceLocation ArgumentLoc,
@@ -734,6 +776,7 @@ OMPClause *Sema::ActOnOpenMPSimpleClause(OpenMPClauseKind Kind,
       ActOnOpenMPDefaultClause(static_cast<OpenMPDefaultClauseKind>(Argument),
                                ArgumentLoc, StartLoc, LParenLoc, EndLoc);
     break;
+  case OMPC_if:
   case OMPC_private:
   case OMPC_firstprivate:
   case OMPC_shared:
@@ -780,7 +823,9 @@ OMPClause *Sema::ActOnOpenMPDefaultClause(OpenMPDefaultClauseKind Kind,
   case OMPC_DEFAULT_shared:
     DSAStack->setDefaultDSAShared();
     break;
-  default:
+  case OMPC_DEFAULT_unknown:
+  case NUM_OPENMP_DEFAULT_KINDS:
+    llvm_unreachable("Clause kind is not allowed.");
     break;
   }
   return new (Context) OMPDefaultClause(Kind, KindKwLoc, StartLoc, LParenLoc,
@@ -803,6 +848,7 @@ OMPClause *Sema::ActOnOpenMPVarListClause(OpenMPClauseKind Kind,
   case OMPC_shared:
     Res = ActOnOpenMPSharedClause(VarList, StartLoc, LParenLoc, EndLoc);
     break;
+  case OMPC_if:
   case OMPC_default:
   case OMPC_threadprivate:
   case OMPC_unknown:
diff --git a/clang/lib/Sema/TreeTransform.h b/clang/lib/Sema/TreeTransform.h
index 7afed1a4480..d9ed6f5f027 100644
--- a/clang/lib/Sema/TreeTransform.h
+++ b/clang/lib/Sema/TreeTransform.h
@@ -1298,6 +1298,18 @@ public:
                                                   StartLoc, EndLoc);
   }
 
+  /// \brief Build a new OpenMP 'if' clause.
+  ///
+  /// By default, performs semantic analysis to build the new statement.
+  /// Subclasses may override this routine to provide different behavior.
+  OMPClause *RebuildOMPIfClause(Expr *Condition,
+                                SourceLocation StartLoc,
+                                SourceLocation LParenLoc,
+                                SourceLocation EndLoc) {
+    return getSema().ActOnOpenMPIfClause(Condition, StartLoc,
+                                         LParenLoc, EndLoc);
+  }
+
   /// \brief Build a new OpenMP 'default' clause.
   ///
   /// By default, performs semantic analysis to build the new statement.
@@ -6279,6 +6291,13 @@ TreeTransform<Derived>::TransformOMPParallelDirective(OMPParallelDirective *D) {
 
 template<typename Derived>
 OMPClause *
+TreeTransform<Derived>::TransformOMPIfClause(OMPIfClause *C) {
+  return getDerived().RebuildOMPIfClause(C->getCondition(), C->getLocStart(),
+                                         C->getLParenLoc(), C->getLocEnd());
+}
+
+template<typename Derived>
+OMPClause *
 TreeTransform<Derived>::TransformOMPDefaultClause(OMPDefaultClause *C) {
   return getDerived().RebuildOMPDefaultClause(C->getDefaultKind(),
                                               C->getDefaultKindKwLoc(),
diff --git a/clang/lib/Serialization/ASTReaderStmt.cpp b/clang/lib/Serialization/ASTReaderStmt.cpp
index 5d2f38d9526..e1ca51fcc19 100644
--- a/clang/lib/Serialization/ASTReaderStmt.cpp
+++ b/clang/lib/Serialization/ASTReaderStmt.cpp
@@ -1673,6 +1673,9 @@ public:
 OMPClause *OMPClauseReader::readClause() {
   OMPClause *C;
   switch (Record[Idx++]) {
+  case OMPC_if:
+    C = new (Context) OMPIfClause();
+    break;
   case OMPC_default:
     C = new (Context) OMPDefaultClause();
     break;
@@ -1693,6 +1696,11 @@ OMPClause *OMPClauseReader::readClause() {
   return C;
 }
 
+void OMPClauseReader::VisitOMPIfClause(OMPIfClause *C) {
+  C->setCondition(Reader->Reader.ReadSubExpr());
+  C->setLParenLoc(Reader->ReadSourceLocation(Record, Idx));
+}
+
 void OMPClauseReader::VisitOMPDefaultClause(OMPDefaultClause *C) {
   C->setDefaultKind(
        static_cast<OpenMPDefaultClauseKind>(Record[Idx++]));
diff --git a/clang/lib/Serialization/ASTWriterStmt.cpp b/clang/lib/Serialization/ASTWriterStmt.cpp
index 77c7296f2d1..428881bb69a 100644
--- a/clang/lib/Serialization/ASTWriterStmt.cpp
+++ b/clang/lib/Serialization/ASTWriterStmt.cpp
@@ -1679,6 +1679,11 @@ void OMPClauseWriter::writeClause(OMPClause *C) {
   Writer->Writer.AddSourceLocation(C->getLocEnd(), Record);
 }
 
+void OMPClauseWriter::VisitOMPIfClause(OMPIfClause *C) {
+  Writer->Writer.AddStmt(C->getCondition());
+  Writer->Writer.AddSourceLocation(C->getLParenLoc(), Record);
+}
+
 void OMPClauseWriter::VisitOMPDefaultClause(OMPDefaultClause *C) {
   Record.push_back(C->getDefaultKind());
   Writer->Writer.AddSourceLocation(C->getLParenLoc(), Record);