[OpenMP 5.0] Parsing/sema support for to clause with mapper modifier.

This patch implements the parsing and sema support for OpenMP to clause
with potential user-defined mappers attached. User defined mapper is a
new feature in OpenMP 5.0. A to/from clause can have an explicit or
implicit associated mapper, which instructs the compiler to generate and
use customized mapping functions. An example is shown below:

    struct S { int len; int *d; };
    #pragma omp declare mapper(id: struct S s) map(s, s.d[0:s.len])
    struct S ss;
    #pragma omp target update to(mapper(id): ss) // use the mapper with name 'id' to map ss to device

Contributed-by: <lildmh@gmail.com>

Differential Revision: https://reviews.llvm.org/D58523

llvm-svn: 354698

1 files changed, 18 insertions, 2 deletions

diff --git a/clang/lib/Basic/OpenMPKinds.cpp b/clang/lib/Basic/OpenMPKinds.cpp
index ea8a46b4953..47830c324d3 100644
--- a/clang/lib/Basic/OpenMPKinds.cpp
+++ b/clang/lib/Basic/OpenMPKinds.cpp
@@ -116,6 +116,12 @@ unsigned clang::getOpenMPSimpleClauseType(OpenMPClauseKind Kind,
   .Case(#Name, static_cast<unsigned>(OMPC_MAP_MODIFIER_##Name))
 #include "clang/Basic/OpenMPKinds.def"
         .Default(OMPC_MAP_unknown);
+  case OMPC_to:
+    return llvm::StringSwitch<unsigned>(Str)
+#define OPENMP_TO_MODIFIER_KIND(Name)                                          \
+  .Case(#Name, static_cast<unsigned>(OMPC_TO_MODIFIER_##Name))
+#include "clang/Basic/OpenMPKinds.def"
+        .Default(OMPC_TO_MODIFIER_unknown);
   case OMPC_dist_schedule:
     return llvm::StringSwitch<OpenMPDistScheduleClauseKind>(Str)
 #define OPENMP_DIST_SCHEDULE_KIND(Name) .Case(#Name, OMPC_DIST_SCHEDULE_##Name)
@@ -174,7 +180,6 @@ unsigned clang::getOpenMPSimpleClauseType(OpenMPClauseKind Kind,
   case OMPC_num_tasks:
   case OMPC_hint:
   case OMPC_uniform:
-  case OMPC_to:
   case OMPC_from:
   case OMPC_use_device_ptr:
   case OMPC_is_device_ptr:
@@ -260,6 +265,18 @@ const char *clang::getOpenMPSimpleClauseTypeName(OpenMPClauseKind Kind,
       break;
     }
     llvm_unreachable("Invalid OpenMP 'map' clause type");
+  case OMPC_to:
+    switch (Type) {
+    case OMPC_TO_MODIFIER_unknown:
+      return "unknown";
+#define OPENMP_TO_MODIFIER_KIND(Name)                                          \
+  case OMPC_TO_MODIFIER_##Name:                                                \
+    return #Name;
+#include "clang/Basic/OpenMPKinds.def"
+    default:
+      break;
+    }
+    llvm_unreachable("Invalid OpenMP 'to' clause type");
   case OMPC_dist_schedule:
     switch (Type) {
     case OMPC_DIST_SCHEDULE_unknown:
@@ -333,7 +350,6 @@ const char *clang::getOpenMPSimpleClauseTypeName(OpenMPClauseKind Kind,
   case OMPC_num_tasks:
   case OMPC_hint:
   case OMPC_uniform:
-  case OMPC_to:
   case OMPC_from:
   case OMPC_use_device_ptr:
   case OMPC_is_device_ptr: