diff --git a/include/clang/AST/OpenMPClause.h b/include/clang/AST/OpenMPClause.h
index 3d6fa0e..1aa1c82 100644
--- a/include/clang/AST/OpenMPClause.h
+++ b/include/clang/AST/OpenMPClause.h
@@ -5082,6 +5082,9 @@
 
   /// Build clause with number of variables \a NumVars.
   ///
+  /// \param MapperQualifierLoc C++ nested name specifier for the associated
+  /// user-defined mapper.
+  /// \param MapperIdInfo The identifier of associated user-defined mapper.
   /// \param Locs Locations needed to build a mappable clause. It includes 1)
   /// StartLoc: starting location of the clause (the clause keyword); 2)
   /// LParenLoc: location of '('; 3) EndLoc: ending location of the clause.
@@ -5090,9 +5093,12 @@
   /// NumUniqueDeclarations: number of unique base declarations in this clause;
   /// 3) NumComponentLists: number of component lists in this clause; and 4)
   /// NumComponents: total number of expression components in the clause.
-  explicit OMPFromClause(const OMPVarListLocTy &Locs,
+  explicit OMPFromClause(NestedNameSpecifierLoc MapperQualifierLoc,
+                         DeclarationNameInfo MapperIdInfo,
+                         const OMPVarListLocTy &Locs,
                          const OMPMappableExprListSizeTy &Sizes)
-      : OMPMappableExprListClause(OMPC_from, Locs, Sizes) {}
+      : OMPMappableExprListClause(OMPC_from, Locs, Sizes, &MapperQualifierLoc,
+                                  &MapperIdInfo) {}
 
   /// Build an empty clause.
   ///
@@ -5107,7 +5113,9 @@
   /// Define the sizes of each trailing object array except the last one. This
   /// is required for TrailingObjects to work properly.
   size_t numTrailingObjects(OverloadToken<Expr *>) const {
-    return varlist_size();
+    // There are varlist_size() of expressions, and varlist_size() of
+    // user-defined mappers.
+    return 2 * varlist_size();
   }
   size_t numTrailingObjects(OverloadToken<ValueDecl *>) const {
     return getUniqueDeclarationsNum();
@@ -5126,10 +5134,18 @@
   /// \param Vars The original expression used in the clause.
   /// \param Declarations Declarations used in the clause.
   /// \param ComponentLists Component lists used in the clause.
+  /// \param UDMapperRefs References to user-defined mappers associated with
+  /// expressions used in the clause.
+  /// \param UDMQualifierLoc C++ nested name specifier for the associated
+  /// user-defined mapper.
+  /// \param MapperId The identifier of associated user-defined mapper.
   static OMPFromClause *Create(const ASTContext &C, const OMPVarListLocTy &Locs,
                                ArrayRef<Expr *> Vars,
                                ArrayRef<ValueDecl *> Declarations,
-                               MappableExprComponentListsRef ComponentLists);
+                               MappableExprComponentListsRef ComponentLists,
+                               ArrayRef<Expr *> UDMapperRefs,
+                               NestedNameSpecifierLoc UDMQualifierLoc,
+                               DeclarationNameInfo MapperId);
 
   /// Creates an empty clause with the place for \a NumVars variables.
   ///
diff --git a/include/clang/Basic/OpenMPKinds.def b/include/clang/Basic/OpenMPKinds.def
index bd3eff4..b8de5df 100644
--- a/include/clang/Basic/OpenMPKinds.def
+++ b/include/clang/Basic/OpenMPKinds.def
@@ -125,6 +125,9 @@
 #ifndef OPENMP_TO_MODIFIER_KIND
 #define OPENMP_TO_MODIFIER_KIND(Name)
 #endif
+#ifndef OPENMP_FROM_MODIFIER_KIND
+#define OPENMP_FROM_MODIFIER_KIND(Name)
+#endif
 #ifndef OPENMP_DIST_SCHEDULE_KIND
 #define OPENMP_DIST_SCHEDULE_KIND(Name)
 #endif
@@ -584,6 +587,9 @@
 // Modifiers for 'to' clause.
 OPENMP_TO_MODIFIER_KIND(mapper)
 
+// Modifiers for 'from' clause.
+OPENMP_FROM_MODIFIER_KIND(mapper)
+
 // Clauses allowed for OpenMP directive 'taskloop'.
 OPENMP_TASKLOOP_CLAUSE(if)
 OPENMP_TASKLOOP_CLAUSE(shared)
@@ -941,6 +947,7 @@
 #undef OPENMP_MAP_KIND
 #undef OPENMP_MAP_MODIFIER_KIND
 #undef OPENMP_TO_MODIFIER_KIND
+#undef OPENMP_FROM_MODIFIER_KIND
 #undef OPENMP_DISTRIBUTE_CLAUSE
 #undef OPENMP_DIST_SCHEDULE_KIND
 #undef OPENMP_DEFAULTMAP_KIND
diff --git a/include/clang/Basic/OpenMPKinds.h b/include/clang/Basic/OpenMPKinds.h
index 2e23fff..01bd860 100644
--- a/include/clang/Basic/OpenMPKinds.h
+++ b/include/clang/Basic/OpenMPKinds.h
@@ -113,6 +113,14 @@
   OMPC_TO_MODIFIER_unknown
 };
 
+/// OpenMP modifier kind for 'from' clause.
+enum OpenMPFromModifierKind {
+#define OPENMP_FROM_MODIFIER_KIND(Name) \
+  OMPC_FROM_MODIFIER_##Name,
+#include "clang/Basic/OpenMPKinds.def"
+  OMPC_FROM_MODIFIER_unknown
+};
+
 /// OpenMP attributes for 'dist_schedule' clause.
 enum OpenMPDistScheduleClauseKind {
 #define OPENMP_DIST_SCHEDULE_KIND(Name) OMPC_DIST_SCHEDULE_##Name,
diff --git a/include/clang/Sema/Sema.h b/include/clang/Sema/Sema.h
index 276e91a..f6eee83 100644
--- a/include/clang/Sema/Sema.h
+++ b/include/clang/Sema/Sema.h
@@ -9477,8 +9477,10 @@
                       const OMPVarListLocTy &Locs,
                       ArrayRef<Expr *> UnresolvedMappers = llvm::None);
   /// Called on well-formed 'from' clause.
-  OMPClause *ActOnOpenMPFromClause(ArrayRef<Expr *> VarList,
-                                   const OMPVarListLocTy &Locs);
+  OMPClause *ActOnOpenMPFromClause(
+      ArrayRef<Expr *> VarList, CXXScopeSpec &MapperIdScopeSpec,
+      DeclarationNameInfo &MapperId, const OMPVarListLocTy &Locs,
+      ArrayRef<Expr *> UnresolvedMappers = llvm::None);
   /// Called on well-formed 'use_device_ptr' clause.
   OMPClause *ActOnOpenMPUseDevicePtrClause(ArrayRef<Expr *> VarList,
                                            const OMPVarListLocTy &Locs);
diff --git a/lib/AST/OpenMPClause.cpp b/lib/AST/OpenMPClause.cpp
index 0f1cb02..b02a888 100644
--- a/lib/AST/OpenMPClause.cpp
+++ b/lib/AST/OpenMPClause.cpp
@@ -892,10 +892,11 @@
   return new (Mem) OMPToClause(Sizes);
 }
 
-OMPFromClause *
-OMPFromClause::Create(const ASTContext &C, const OMPVarListLocTy &Locs,
-                      ArrayRef<Expr *> Vars, ArrayRef<ValueDecl *> Declarations,
-                      MappableExprComponentListsRef ComponentLists) {
+OMPFromClause *OMPFromClause::Create(
+    const ASTContext &C, const OMPVarListLocTy &Locs, ArrayRef<Expr *> Vars,
+    ArrayRef<ValueDecl *> Declarations,
+    MappableExprComponentListsRef ComponentLists, ArrayRef<Expr *> UDMapperRefs,
+    NestedNameSpecifierLoc UDMQualifierLoc, DeclarationNameInfo MapperId) {
   OMPMappableExprListSizeTy Sizes;
   Sizes.NumVars = Vars.size();
   Sizes.NumUniqueDeclarations = getUniqueDeclarationsTotalNumber(Declarations);
@@ -903,8 +904,8 @@
   Sizes.NumComponents = getComponentsTotalNumber(ComponentLists);
 
   // We need to allocate:
-  // NumVars x Expr* - we have an original list expression for each clause list
-  // entry.
+  // 2 x NumVars x Expr* - we have an original list expression and an associated
+  // user-defined mapper for each clause list entry.
   // NumUniqueDeclarations x ValueDecl* - unique base declarations associated
   // with each component list.
   // (NumUniqueDeclarations + NumComponentLists) x unsigned - we specify the
@@ -915,13 +916,15 @@
   void *Mem = C.Allocate(
       totalSizeToAlloc<Expr *, ValueDecl *, unsigned,
                        OMPClauseMappableExprCommon::MappableComponent>(
-          Sizes.NumVars, Sizes.NumUniqueDeclarations,
+          2 * Sizes.NumVars, Sizes.NumUniqueDeclarations,
           Sizes.NumUniqueDeclarations + Sizes.NumComponentLists,
           Sizes.NumComponents));
 
-  OMPFromClause *Clause = new (Mem) OMPFromClause(Locs, Sizes);
+  auto *Clause =
+      new (Mem) OMPFromClause(UDMQualifierLoc, MapperId, Locs, Sizes);
 
   Clause->setVarRefs(Vars);
+  Clause->setUDMapperRefs(UDMapperRefs);
   Clause->setClauseInfo(Declarations, ComponentLists);
   return Clause;
 }
@@ -932,7 +935,7 @@
   void *Mem = C.Allocate(
       totalSizeToAlloc<Expr *, ValueDecl *, unsigned,
                        OMPClauseMappableExprCommon::MappableComponent>(
-          Sizes.NumVars, Sizes.NumUniqueDeclarations,
+          2 * Sizes.NumVars, Sizes.NumUniqueDeclarations,
           Sizes.NumUniqueDeclarations + Sizes.NumComponentLists,
           Sizes.NumComponents));
   return new (Mem) OMPFromClause(Sizes);
@@ -1465,7 +1468,19 @@
 void OMPClausePrinter::VisitOMPFromClause(OMPFromClause *Node) {
   if (!Node->varlist_empty()) {
     OS << "from";
-    VisitOMPClauseList(Node, '(');
+    DeclarationNameInfo MapperId = Node->getMapperIdInfo();
+    if (MapperId.getName() && !MapperId.getName().isEmpty()) {
+      OS << '(';
+      OS << "mapper(";
+      NestedNameSpecifier *MapperNNS =
+          Node->getMapperQualifierLoc().getNestedNameSpecifier();
+      if (MapperNNS)
+        MapperNNS->print(OS, Policy);
+      OS << MapperId << "):";
+      VisitOMPClauseList(Node, ' ');
+    } else {
+      VisitOMPClauseList(Node, '(');
+    }
     OS << ")";
   }
 }
diff --git a/lib/Basic/OpenMPKinds.cpp b/lib/Basic/OpenMPKinds.cpp
index 47830c3..b10c6d2 100644
--- a/lib/Basic/OpenMPKinds.cpp
+++ b/lib/Basic/OpenMPKinds.cpp
@@ -122,6 +122,12 @@
   .Case(#Name, static_cast<unsigned>(OMPC_TO_MODIFIER_##Name))
 #include "clang/Basic/OpenMPKinds.def"
         .Default(OMPC_TO_MODIFIER_unknown);
+  case OMPC_from:
+    return llvm::StringSwitch<unsigned>(Str)
+#define OPENMP_FROM_MODIFIER_KIND(Name)                                     \
+  .Case(#Name, static_cast<unsigned>(OMPC_FROM_MODIFIER_##Name))
+#include "clang/Basic/OpenMPKinds.def"
+        .Default(OMPC_FROM_MODIFIER_unknown);
   case OMPC_dist_schedule:
     return llvm::StringSwitch<OpenMPDistScheduleClauseKind>(Str)
 #define OPENMP_DIST_SCHEDULE_KIND(Name) .Case(#Name, OMPC_DIST_SCHEDULE_##Name)
@@ -180,7 +186,6 @@
   case OMPC_num_tasks:
   case OMPC_hint:
   case OMPC_uniform:
-  case OMPC_from:
   case OMPC_use_device_ptr:
   case OMPC_is_device_ptr:
   case OMPC_unified_address:
@@ -277,6 +282,18 @@
       break;
     }
     llvm_unreachable("Invalid OpenMP 'to' clause type");
+  case OMPC_from:
+    switch (Type) {
+    case OMPC_FROM_MODIFIER_unknown:
+      return "unknown";
+#define OPENMP_FROM_MODIFIER_KIND(Name)                                        \
+  case OMPC_FROM_MODIFIER_##Name:                                              \
+    return #Name;
+#include "clang/Basic/OpenMPKinds.def"
+    default:
+      break;
+    }
+    llvm_unreachable("Invalid OpenMP 'from' clause type");
   case OMPC_dist_schedule:
     switch (Type) {
     case OMPC_DIST_SCHEDULE_unknown:
@@ -350,7 +367,6 @@
   case OMPC_num_tasks:
   case OMPC_hint:
   case OMPC_uniform:
-  case OMPC_from:
   case OMPC_use_device_ptr:
   case OMPC_is_device_ptr:
   case OMPC_unified_address:
diff --git a/lib/Parse/ParseOpenMP.cpp b/lib/Parse/ParseOpenMP.cpp
index 68843f0..782ad12 100644
--- a/lib/Parse/ParseOpenMP.cpp
+++ b/lib/Parse/ParseOpenMP.cpp
@@ -2161,13 +2161,20 @@
 
     if (Tok.is(tok::colon))
       Data.ColonLoc = ConsumeToken();
-  } else if (Kind == OMPC_to) {
+  } else if (Kind == OMPC_to || Kind == OMPC_from) {
     if (Tok.is(tok::identifier)) {
       bool IsMapperModifier = false;
-      auto Modifier = static_cast<OpenMPToModifierKind>(
-          getOpenMPSimpleClauseType(Kind, PP.getSpelling(Tok)));
-      if (Modifier == OMPC_TO_MODIFIER_mapper)
-        IsMapperModifier = true;
+      if (Kind == OMPC_to) {
+        auto Modifier = static_cast<OpenMPToModifierKind>(
+            getOpenMPSimpleClauseType(Kind, PP.getSpelling(Tok)));
+        if (Modifier == OMPC_TO_MODIFIER_mapper)
+          IsMapperModifier = true;
+      } else {
+        auto Modifier = static_cast<OpenMPFromModifierKind>(
+            getOpenMPSimpleClauseType(Kind, PP.getSpelling(Tok)));
+        if (Modifier == OMPC_FROM_MODIFIER_mapper)
+          IsMapperModifier = true;
+      }
       if (IsMapperModifier) {
         // Parse the mapper modifier.
         ConsumeToken();
@@ -2282,7 +2289,7 @@
 ///    to-clause:
 ///       'to' '(' [ mapper '(' mapper-identifier ')' ':' ] list ')'
 ///    from-clause:
-///       'from' '(' list ')'
+///       'from' '(' [ mapper '(' mapper-identifier ')' ':' ] list ')'
 ///    use_device_ptr-clause:
 ///       'use_device_ptr' '(' list ')'
 ///    is_device_ptr-clause:
diff --git a/lib/Sema/SemaOpenMP.cpp b/lib/Sema/SemaOpenMP.cpp
index 5a6891d..76141af 100644
--- a/lib/Sema/SemaOpenMP.cpp
+++ b/lib/Sema/SemaOpenMP.cpp
@@ -9806,7 +9806,8 @@
                               ReductionOrMapperId, Locs);
     break;
   case OMPC_from:
-    Res = ActOnOpenMPFromClause(VarList, Locs);
+    Res = ActOnOpenMPFromClause(VarList, ReductionOrMapperIdScopeSpec,
+                                ReductionOrMapperId, Locs);
     break;
   case OMPC_use_device_ptr:
     Res = ActOnOpenMPUseDevicePtrClause(VarList, Locs);
@@ -13190,15 +13191,13 @@
     if (VE->isValueDependent() || VE->isTypeDependent() ||
         VE->isInstantiationDependent() ||
         VE->containsUnexpandedParameterPack()) {
-      if (CKind != OMPC_from) {
-        // Try to find the associated user-defined mapper.
-        ExprResult ER = buildUserDefinedMapperRef(
-            SemaRef, DSAS->getCurScope(), MapperIdScopeSpec, MapperId,
-            VE->getType().getCanonicalType(), UnresolvedMapper);
-        if (ER.isInvalid())
-          continue;
-        MVLI.UDMapperList.push_back(ER.get());
-      }
+      // Try to find the associated user-defined mapper.
+      ExprResult ER = buildUserDefinedMapperRef(
+          SemaRef, DSAS->getCurScope(), MapperIdScopeSpec, MapperId,
+          VE->getType().getCanonicalType(), UnresolvedMapper);
+      if (ER.isInvalid())
+        continue;
+      MVLI.UDMapperList.push_back(ER.get());
       // We can only analyze this information once the missing information is
       // resolved.
       MVLI.ProcessedVarList.push_back(RE);
@@ -13230,15 +13229,13 @@
     if (const auto *TE = dyn_cast<CXXThisExpr>(BE)) {
       // Add store "this" pointer to class in DSAStackTy for future checking
       DSAS->addMappedClassesQualTypes(TE->getType());
-      if (CKind != OMPC_from) {
-        // Try to find the associated user-defined mapper.
-        ExprResult ER = buildUserDefinedMapperRef(
-            SemaRef, DSAS->getCurScope(), MapperIdScopeSpec, MapperId,
-            VE->getType().getCanonicalType(), UnresolvedMapper);
-        if (ER.isInvalid())
-          continue;
-        MVLI.UDMapperList.push_back(ER.get());
-      }
+      // Try to find the associated user-defined mapper.
+      ExprResult ER = buildUserDefinedMapperRef(
+          SemaRef, DSAS->getCurScope(), MapperIdScopeSpec, MapperId,
+          VE->getType().getCanonicalType(), UnresolvedMapper);
+      if (ER.isInvalid())
+        continue;
+      MVLI.UDMapperList.push_back(ER.get());
       // Skip restriction checking for variable or field declarations
       MVLI.ProcessedVarList.push_back(RE);
       MVLI.VarComponents.resize(MVLI.VarComponents.size() + 1);
@@ -13358,14 +13355,12 @@
     }
 
     // Try to find the associated user-defined mapper.
-    if (CKind != OMPC_from) {
-      ExprResult ER = buildUserDefinedMapperRef(
-          SemaRef, DSAS->getCurScope(), MapperIdScopeSpec, MapperId,
-          Type.getCanonicalType(), UnresolvedMapper);
-      if (ER.isInvalid())
-        continue;
-      MVLI.UDMapperList.push_back(ER.get());
-    }
+    ExprResult ER = buildUserDefinedMapperRef(
+        SemaRef, DSAS->getCurScope(), MapperIdScopeSpec, MapperId,
+        Type.getCanonicalType(), UnresolvedMapper);
+    if (ER.isInvalid())
+      continue;
+    MVLI.UDMapperList.push_back(ER.get());
 
     // Save the current expression.
     MVLI.ProcessedVarList.push_back(RE);
@@ -14182,18 +14177,20 @@
 }
 
 OMPClause *Sema::ActOnOpenMPFromClause(ArrayRef<Expr *> VarList,
-                                       const OMPVarListLocTy &Locs) {
+                                       CXXScopeSpec &MapperIdScopeSpec,
+                                       DeclarationNameInfo &MapperId,
+                                       const OMPVarListLocTy &Locs,
+                                       ArrayRef<Expr *> UnresolvedMappers) {
   MappableVarListInfo MVLI(VarList);
-  CXXScopeSpec MapperIdScopeSpec;
-  DeclarationNameInfo MapperId;
-  ArrayRef<Expr *> UnresolvedMappers;
   checkMappableExpressionList(*this, DSAStack, OMPC_from, MVLI, Locs.StartLoc,
                               MapperIdScopeSpec, MapperId, UnresolvedMappers);
   if (MVLI.ProcessedVarList.empty())
     return nullptr;
 
-  return OMPFromClause::Create(Context, Locs, MVLI.ProcessedVarList,
-                               MVLI.VarBaseDeclarations, MVLI.VarComponents);
+  return OMPFromClause::Create(
+      Context, Locs, MVLI.ProcessedVarList, MVLI.VarBaseDeclarations,
+      MVLI.VarComponents, MVLI.UDMapperList,
+      MapperIdScopeSpec.getWithLocInContext(Context), MapperId);
 }
 
 OMPClause *Sema::ActOnOpenMPUseDevicePtrClause(ArrayRef<Expr *> VarList,
diff --git a/lib/Sema/TreeTransform.h b/lib/Sema/TreeTransform.h
index b8f922a..386b23d 100644
--- a/lib/Sema/TreeTransform.h
+++ b/lib/Sema/TreeTransform.h
@@ -1915,8 +1915,12 @@
   /// By default, performs semantic analysis to build the new statement.
   /// Subclasses may override this routine to provide different behavior.
   OMPClause *RebuildOMPFromClause(ArrayRef<Expr *> VarList,
-                                  const OMPVarListLocTy &Locs) {
-    return getSema().ActOnOpenMPFromClause(VarList, Locs);
+                                  CXXScopeSpec &MapperIdScopeSpec,
+                                  DeclarationNameInfo &MapperId,
+                                  const OMPVarListLocTy &Locs,
+                                  ArrayRef<Expr *> UnresolvedMappers) {
+    return getSema().ActOnOpenMPFromClause(VarList, MapperIdScopeSpec, MapperId,
+                                           Locs, UnresolvedMappers);
   }
 
   /// Build a new OpenMP 'use_device_ptr' clause.
@@ -8976,16 +8980,16 @@
 
 template <typename Derived>
 OMPClause *TreeTransform<Derived>::TransformOMPFromClause(OMPFromClause *C) {
-  llvm::SmallVector<Expr *, 16> Vars;
-  Vars.reserve(C->varlist_size());
-  for (auto *VE : C->varlists()) {
-    ExprResult EVar = getDerived().TransformExpr(cast<Expr>(VE));
-    if (EVar.isInvalid())
-      return 0;
-    Vars.push_back(EVar.get());
-  }
   OMPVarListLocTy Locs(C->getBeginLoc(), C->getLParenLoc(), C->getEndLoc());
-  return getDerived().RebuildOMPFromClause(Vars, Locs);
+  llvm::SmallVector<Expr *, 16> Vars;
+  CXXScopeSpec MapperIdScopeSpec;
+  DeclarationNameInfo MapperIdInfo;
+  llvm::SmallVector<Expr *, 16> UnresolvedMappers;
+  if (transformOMPMappableExprListClause<Derived, OMPFromClause>(
+          *this, C, Vars, MapperIdScopeSpec, MapperIdInfo, UnresolvedMappers))
+    return nullptr;
+  return getDerived().RebuildOMPFromClause(
+      Vars, MapperIdScopeSpec, MapperIdInfo, Locs, UnresolvedMappers);
 }
 
 template <typename Derived>
diff --git a/lib/Serialization/ASTReader.cpp b/lib/Serialization/ASTReader.cpp
index bed58d0..9626418 100644
--- a/lib/Serialization/ASTReader.cpp
+++ b/lib/Serialization/ASTReader.cpp
@@ -12448,6 +12448,10 @@
 
 void OMPClauseReader::VisitOMPFromClause(OMPFromClause *C) {
   C->setLParenLoc(Record.readSourceLocation());
+  C->setMapperQualifierLoc(Record.readNestedNameSpecifierLoc());
+  DeclarationNameInfo DNI;
+  Record.readDeclarationNameInfo(DNI);
+  C->setMapperIdInfo(DNI);
   auto NumVars = C->varlist_size();
   auto UniqueDecls = C->getUniqueDeclarationsNum();
   auto TotalLists = C->getTotalComponentListNum();
@@ -12459,6 +12463,12 @@
     Vars.push_back(Record.readSubExpr());
   C->setVarRefs(Vars);
 
+  SmallVector<Expr *, 16> UDMappers;
+  UDMappers.reserve(NumVars);
+  for (unsigned I = 0; I < NumVars; ++I)
+    UDMappers.push_back(Record.readSubExpr());
+  C->setUDMapperRefs(UDMappers);
+
   SmallVector<ValueDecl *, 16> Decls;
   Decls.reserve(UniqueDecls);
   for (unsigned i = 0; i < UniqueDecls; ++i)
diff --git a/lib/Serialization/ASTWriter.cpp b/lib/Serialization/ASTWriter.cpp
index 1575a40..3d19c9d 100644
--- a/lib/Serialization/ASTWriter.cpp
+++ b/lib/Serialization/ASTWriter.cpp
@@ -6885,8 +6885,12 @@
   Record.push_back(C->getTotalComponentListNum());
   Record.push_back(C->getTotalComponentsNum());
   Record.AddSourceLocation(C->getLParenLoc());
+  Record.AddNestedNameSpecifierLoc(C->getMapperQualifierLoc());
+  Record.AddDeclarationNameInfo(C->getMapperIdInfo());
   for (auto *E : C->varlists())
     Record.AddStmt(E);
+  for (auto *E : C->mapperlists())
+    Record.AddStmt(E);
   for (auto *D : C->all_decls())
     Record.AddDeclRef(D);
   for (auto N : C->all_num_lists())
diff --git a/test/OpenMP/declare_mapper_ast_print.c b/test/OpenMP/declare_mapper_ast_print.c
index f053044..e82bc4c 100644
--- a/test/OpenMP/declare_mapper_ast_print.c
+++ b/test/OpenMP/declare_mapper_ast_print.c
@@ -48,8 +48,8 @@
 #pragma omp target map(mapper(default), from: dd[0:10])
 // CHECK: #pragma omp target map(mapper(default),from: dd[0:10])
     { dd[0].i++; }
-#pragma omp target update to(mapper(id): vv)
-// CHECK: #pragma omp target update to(mapper(id): vv)
+#pragma omp target update to(mapper(id): vv) from(mapper(default): dd[0:10])
+// CHECK: #pragma omp target update to(mapper(id): vv) from(mapper(default): dd[0:10])
   }
   return 0;
 }
diff --git a/test/OpenMP/declare_mapper_ast_print.cpp b/test/OpenMP/declare_mapper_ast_print.cpp
index 1e05fe5..6462fa3 100644
--- a/test/OpenMP/declare_mapper_ast_print.cpp
+++ b/test/OpenMP/declare_mapper_ast_print.cpp
@@ -83,6 +83,8 @@
   { fd.b.k++; }
 #pragma omp target update to(mapper(id): fd)
 #pragma omp target update to(mapper(idd): fd.b)
+#pragma omp target update from(mapper(id): fd)
+#pragma omp target update from(mapper(idd): fd.b)
   return 0;
 }
 
@@ -97,6 +99,8 @@
 // CHECK: #pragma omp target map(mapper(idd),alloc: fd.b)
 // CHECK: #pragma omp target update to(mapper(id): fd)
 // CHECK: #pragma omp target update to(mapper(idd): fd.b)
+// CHECK: #pragma omp target update from(mapper(id): fd)
+// CHECK: #pragma omp target update from(mapper(idd): fd.b)
 // CHECK: }
 // CHECK: template<> int foo<int>(int a) {
 // CHECK: #pragma omp declare mapper (id : struct foodat v) map(tofrom: v.a)
@@ -109,6 +113,8 @@
 // CHECK: #pragma omp target map(mapper(idd),alloc: fd.b)
 // CHECK: #pragma omp target update to(mapper(id): fd)
 // CHECK: #pragma omp target update to(mapper(idd): fd.b)
+// CHECK: #pragma omp target update from(mapper(id): fd)
+// CHECK: #pragma omp target update from(mapper(idd): fd.b)
 // CHECK: }
 
 // CHECK: int main() {
@@ -131,6 +137,11 @@
 #pragma omp target update to(mapper(dat<double>::id): vvv)
 // CHECK: #pragma omp target update to(mapper(dat<double>::id): vvv)
 
+#pragma omp target update from(mapper(N1::id) : vc)
+// CHECK: #pragma omp target update from(mapper(N1::id): vc)
+#pragma omp target update from(mapper(dat<double>::id): vvv)
+// CHECK: #pragma omp target update from(mapper(dat<double>::id): vvv)
+
 #pragma omp declare mapper(id: N1::vec v) map(v.len)
 // CHECK: #pragma omp declare mapper (id : N1::vec v) map(tofrom: v.len)
   {
diff --git a/test/OpenMP/declare_mapper_codegen.cpp b/test/OpenMP/declare_mapper_codegen.cpp
index 4946ab2..6f1d6ec 100644
--- a/test/OpenMP/declare_mapper_codegen.cpp
+++ b/test/OpenMP/declare_mapper_codegen.cpp
@@ -26,12 +26,14 @@
 
 #pragma omp declare mapper(id: C s) map(s.a)
 
-// CHECK-LABEL: @.__omp_offloading_{{.*}}foo{{.*}}_l52.region_id = weak constant i8 0
+// CHECK-LABEL: @.__omp_offloading_{{.*}}foo{{.*}}_l54.region_id = weak constant i8 0
 
 // CHECK: [[SIZES:@.+]] = {{.+}}constant [1 x i[[sz:64|32]]] [i{{64|32}} 4]
 // CHECK: [[TYPES:@.+]] = {{.+}}constant [1 x i64] [i64 35]
 // CHECK: [[TSIZES:@.+]] = {{.+}}constant [1 x i[[sz]]] [i[[sz]] 4]
 // CHECK: [[TTYPES:@.+]] = {{.+}}constant [1 x i64] [i64 33]
+// CHECK: [[FSIZES:@.+]] = {{.+}}constant [1 x i[[sz]]] [i[[sz]] 4]
+// CHECK: [[FTYPES:@.+]] = {{.+}}constant [1 x i64] [i64 34]
 
 // CHECK-LABEL: foo{{.*}}(
 void foo(int a){
@@ -64,6 +66,17 @@
   // CHECK-DAG: store %class.C* [[VAL]], %class.C** [[TCBP0]]
   // CHECK-DAG: store %class.C* [[VAL]], %class.C** [[TCP0]]
   #pragma omp target update to(mapper(id): c)
+
+  // CHECK-DAG: call void @__tgt_target_data_update(i64 -1, i32 1, i8** [[FGEPBP:%.+]], i8** [[FGEPP:%.+]], i[[sz]]* getelementptr {{.+}}[1 x i[[sz]]]* [[FSIZES]], i32 0, i32 0), {{.+}}getelementptr {{.+}}[1 x i64]* [[FTYPES]]{{.+}})
+  // CHECK-DAG: [[FGEPBP]] = getelementptr inbounds {{.+}}[[FBP:%[^,]+]], i{{.+}} 0, i{{.+}} 0
+  // CHECK-DAG: [[FGEPP]] = getelementptr inbounds {{.+}}[[FP:%[^,]+]], i{{.+}} 0, i{{.+}} 0
+  // CHECK-DAG: [[FBP0:%.+]] = getelementptr inbounds {{.+}}[[FBP]], i{{.+}} 0, i{{.+}} 0
+  // CHECK-DAG: [[FP0:%.+]] = getelementptr inbounds {{.+}}[[FP]], i{{.+}} 0, i{{.+}} 0
+  // CHECK-DAG: [[FCBP0:%.+]] = bitcast i8** [[FBP0]] to %class.C**
+  // CHECK-DAG: [[FCP0:%.+]] = bitcast i8** [[FP0]] to %class.C**
+  // CHECK-DAG: store %class.C* [[VAL]], %class.C** [[FCBP0]]
+  // CHECK-DAG: store %class.C* [[VAL]], %class.C** [[FCP0]]
+  #pragma omp target update from(mapper(id): c)
 }
 
 
diff --git a/test/OpenMP/declare_mapper_messages.c b/test/OpenMP/declare_mapper_messages.c
index 95014b0..4df14b6 100644
--- a/test/OpenMP/declare_mapper_messages.c
+++ b/test/OpenMP/declare_mapper_messages.c
@@ -58,6 +58,15 @@
 #pragma omp target update to(mapper(aa :vv)                             // expected-error {{expected ')'}} expected-note {{to match this '('}} expected-error {{expected at least one 'to' clause or 'from' clause specified to '#pragma omp target update'}}
 #pragma omp target update to(mapper(ab):vv)                             // expected-error {{cannot find a valid user-defined mapper for type 'struct vec' with name 'ab'}} expected-error {{expected at least one 'to' clause or 'from' clause specified to '#pragma omp target update'}}
 #pragma omp target update to(mapper(aa):vv)
+
+#pragma omp target update from(mapper)                                  // expected-error {{expected '(' after 'mapper'}} expected-error {{expected expression}} expected-error {{expected at least one 'to' clause or 'from' clause specified to '#pragma omp target update'}}
+#pragma omp target update from(mapper()                                 // expected-error {{illegal OpenMP user-defined mapper identifier}} expected-error {{expected expression}} expected-error {{expected at least one 'to' clause or 'from' clause specified to '#pragma omp target update'}}
+#pragma omp target update from(mapper:vv)                               // expected-error {{expected '(' after 'mapper'}} expected-error {{expected at least one 'to' clause or 'from' clause specified to '#pragma omp target update'}}
+#pragma omp target update from(mapper(:vv)                              // expected-error {{illegal OpenMP user-defined mapper identifier}} expected-error {{expected at least one 'to' clause or 'from' clause specified to '#pragma omp target update'}}
+#pragma omp target update from(mapper(aa :vv)                           // expected-error {{expected ')'}} expected-note {{to match this '('}} expected-error {{expected at least one 'to' clause or 'from' clause specified to '#pragma omp target update'}}
+#pragma omp target update from(mapper(ab):vv)                           // expected-error {{cannot find a valid user-defined mapper for type 'struct vec' with name 'ab'}} expected-error {{expected at least one 'to' clause or 'from' clause specified to '#pragma omp target update'}}
+#pragma omp target update from(mapper(aa) a:vv)                         // expected-warning {{missing ':' after ) - ignoring}}
+#pragma omp target update from(mapper(aa):vv)
     }
   }
   return arg;
diff --git a/test/OpenMP/declare_mapper_messages.cpp b/test/OpenMP/declare_mapper_messages.cpp
index d7aa073..bcb5ac4 100644
--- a/test/OpenMP/declare_mapper_messages.cpp
+++ b/test/OpenMP/declare_mapper_messages.cpp
@@ -99,6 +99,19 @@
 #pragma omp target update to(mapper(aa) a:vv)                           // expected-warning {{missing ':' after ) - ignoring}}
 #pragma omp target update to(mapper(aa):vv)
 #pragma omp target update to(mapper(N1::stack<int>::id) :vv)
+
+#pragma omp target update from(mapper)                                  // expected-error {{expected '(' after 'mapper'}} expected-error {{expected expression}} expected-error {{expected at least one 'to' clause or 'from' clause specified to '#pragma omp target update'}}
+#pragma omp target update from(mapper()                                 // expected-error {{illegal OpenMP user-defined mapper identifier}} expected-error {{expected expression}} expected-error {{expected at least one 'to' clause or 'from' clause specified to '#pragma omp target update'}}
+#pragma omp target update from(mapper:vv)                               // expected-error {{expected '(' after 'mapper'}} expected-error {{expected at least one 'to' clause or 'from' clause specified to '#pragma omp target update'}}
+#pragma omp target update from(mapper(:vv)                              // expected-error {{illegal OpenMP user-defined mapper identifier}} expected-error {{expected at least one 'to' clause or 'from' clause specified to '#pragma omp target update'}}
+#pragma omp target update from(mapper(aa :vv)                           // expected-error {{expected ')'}} expected-note {{to match this '('}} expected-error {{expected at least one 'to' clause or 'from' clause specified to '#pragma omp target update'}}
+#pragma omp target update from(mapper(N2:: :vv)                         // expected-error {{use of undeclared identifier 'N2'}} expected-error {{illegal OpenMP user-defined mapper identifier}} expected-error {{expected at least one 'to' clause or 'from' clause specified to '#pragma omp target update'}}
+#pragma omp target update from(mapper(N1:: :vv)                         // expected-error {{illegal OpenMP user-defined mapper identifier}} expected-error {{expected at least one 'to' clause or 'from' clause specified to '#pragma omp target update'}}
+#pragma omp target update from(mapper(N1::aa) :vv)                      // expected-error {{cannot find a valid user-defined mapper for type 'vec' with name 'aa'}} expected-error {{expected at least one 'to' clause or 'from' clause specified to '#pragma omp target update'}}
+#pragma omp target update from(mapper(ab):vv)                           // expected-error {{cannot find a valid user-defined mapper for type 'vec' with name 'ab'}} expected-error {{expected at least one 'to' clause or 'from' clause specified to '#pragma omp target update'}}
+#pragma omp target update from(mapper(aa) a:vv)                         // expected-warning {{missing ':' after ) - ignoring}}
+#pragma omp target update from(mapper(aa):vv)
+#pragma omp target update from(mapper(N1::stack<int>::id) :vv)
     }
 #pragma omp declare mapper(id: vec v) map(v.len)                        // expected-error {{redefinition of user-defined mapper for type 'vec' with name 'id'}}
   }