[OpenMP] Parsing and sema support for the to clause

Summary:
The patch contains the parsing and sema support for the `to` clause. 

Patch based on the original post by Kelvin Li.

Reviewers: carlo.bertolli, hfinkel, kkwli0, arpith-jacob, ABataev

Subscribers: caomhin, cfe-commits

Differential Revision: http://reviews.llvm.org/D18597

llvm-svn: 270880

3 files changed, 62 insertions, 0 deletions

diff --git a/clang/lib/AST/OpenMPClause.cpp b/clang/lib/AST/OpenMPClause.cpp
index 23c05d5c281..1449e37ce6e 100644
--- a/clang/lib/AST/OpenMPClause.cpp
+++ b/clang/lib/AST/OpenMPClause.cpp
@@ -87,6 +87,7 @@ const OMPClauseWithPreInit *OMPClauseWithPreInit::get(const OMPClause *C) {
   case OMPC_defaultmap:
   case OMPC_unknown:
   case OMPC_uniform:
+  case OMPC_to:
     break;
   }
 
@@ -148,6 +149,7 @@ const OMPClauseWithPostUpdate *OMPClauseWithPostUpdate::get(const OMPClause *C)
   case OMPC_defaultmap:
   case OMPC_unknown:
   case OMPC_uniform:
+  case OMPC_to:
     break;
   }
 
@@ -625,3 +627,52 @@ OMPMapClause *OMPMapClause::CreateEmpty(const ASTContext &C, unsigned NumVars,
   return new (Mem) OMPMapClause(NumVars, NumUniqueDeclarations,
                                 NumComponentLists, NumComponents);
 }
+
+OMPToClause *OMPToClause::Create(const ASTContext &C, SourceLocation StartLoc,
+                                 SourceLocation LParenLoc,
+                                 SourceLocation EndLoc, ArrayRef<Expr *> Vars,
+                                 ArrayRef<ValueDecl *> Declarations,
+                                 MappableExprComponentListsRef ComponentLists) {
+  unsigned NumVars = Vars.size();
+  unsigned NumUniqueDeclarations =
+      getUniqueDeclarationsTotalNumber(Declarations);
+  unsigned NumComponentLists = ComponentLists.size();
+  unsigned NumComponents = getComponentsTotalNumber(ComponentLists);
+
+  // We need to allocate:
+  // NumVars x Expr* - we have an original list expression for each clause list
+  // entry.
+  // NumUniqueDeclarations x ValueDecl* - unique base declarations associated
+  // with each component list.
+  // (NumUniqueDeclarations + NumComponentLists) x unsigned - we specify the
+  // number of lists for each unique declaration and the size of each component
+  // list.
+  // NumComponents x MappableComponent - the total of all the components in all
+  // the lists.
+  void *Mem = C.Allocate(
+      totalSizeToAlloc<Expr *, ValueDecl *, unsigned,
+                       OMPClauseMappableExprCommon::MappableComponent>(
+          NumVars, NumUniqueDeclarations,
+          NumUniqueDeclarations + NumComponentLists, NumComponents));
+
+  OMPToClause *Clause = new (Mem)
+      OMPToClause(StartLoc, LParenLoc, EndLoc, NumVars, NumUniqueDeclarations,
+                  NumComponentLists, NumComponents);
+
+  Clause->setVarRefs(Vars);
+  Clause->setClauseInfo(Declarations, ComponentLists);
+  return Clause;
+}
+
+OMPToClause *OMPToClause::CreateEmpty(const ASTContext &C, unsigned NumVars,
+                                      unsigned NumUniqueDeclarations,
+                                      unsigned NumComponentLists,
+                                      unsigned NumComponents) {
+  void *Mem = C.Allocate(
+      totalSizeToAlloc<Expr *, ValueDecl *, unsigned,
+                       OMPClauseMappableExprCommon::MappableComponent>(
+          NumVars, NumUniqueDeclarations,
+          NumUniqueDeclarations + NumComponentLists, NumComponents));
+  return new (Mem) OMPToClause(NumVars, NumUniqueDeclarations,
+                               NumComponentLists, NumComponents);
+}
diff --git a/clang/lib/AST/StmtPrinter.cpp b/clang/lib/AST/StmtPrinter.cpp
index 31065744649..81ce0b5b662 100644
--- a/clang/lib/AST/StmtPrinter.cpp
+++ b/clang/lib/AST/StmtPrinter.cpp
@@ -912,6 +912,14 @@ void OMPClausePrinter::VisitOMPMapClause(OMPMapClause *Node) {
   }
 }
 
+void OMPClausePrinter::VisitOMPToClause(OMPToClause *Node) {
+  if (!Node->varlist_empty()) {
+    OS << "to";
+    VisitOMPClauseList(Node, '(');
+    OS << ")";
+  }
+}
+
 void OMPClausePrinter::VisitOMPDistScheduleClause(OMPDistScheduleClause *Node) {
   OS << "dist_schedule(" << getOpenMPSimpleClauseTypeName(
                            OMPC_dist_schedule, Node->getDistScheduleKind());
diff --git a/clang/lib/AST/StmtProfile.cpp b/clang/lib/AST/StmtProfile.cpp
index 3f0391eb0b7..22b0b31285e 100644
--- a/clang/lib/AST/StmtProfile.cpp
+++ b/clang/lib/AST/StmtProfile.cpp
@@ -491,6 +491,9 @@ void OMPClauseProfiler::VisitOMPNumTasksClause(const OMPNumTasksClause *C) {
 void OMPClauseProfiler::VisitOMPHintClause(const OMPHintClause *C) {
   Profiler->VisitStmt(C->getHint());
 }
+void OMPClauseProfiler::VisitOMPToClause(const OMPToClause *C) {
+  VisitOMPClauseList(C);
+}
 }
 
 void