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

This patch implements the parsing and sema support for the OpenMP
'from'-clause with potential user-defined mappers attached.
User-defined mappers are a new feature in OpenMP 5.0. A '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 from(mapper(id): ss) // use the mapper with name 'id' to map ss from device

Contributed-by: Lingda Li <lildmh@gmail.com>

Differential Revision: https://reviews.llvm.org/D58638

llvm-svn: 354817

1 files changed, 18 insertions, 2 deletions

diff --git a/clang/lib/Basic/OpenMPKinds.cpp b/clang/lib/Basic/OpenMPKinds.cpp
index 47830c324d3..b10c6d2498e 100644
--- a/clang/lib/Basic/OpenMPKinds.cpp
+++ b/clang/lib/Basic/OpenMPKinds.cpp
@@ -122,6 +122,12 @@ unsigned clang::getOpenMPSimpleClauseType(OpenMPClauseKind Kind,
   .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 @@ unsigned clang::getOpenMPSimpleClauseType(OpenMPClauseKind Kind,
   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 @@ const char *clang::getOpenMPSimpleClauseTypeName(OpenMPClauseKind Kind,
       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 @@ const char *clang::getOpenMPSimpleClauseTypeName(OpenMPClauseKind Kind,
   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: