[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, 13 insertions, 0 deletions

diff --git a/clang/test/OpenMP/declare_mapper_messages.cpp b/clang/test/OpenMP/declare_mapper_messages.cpp
index d7aa073da99..bcb5ac463a0 100644
--- a/clang/test/OpenMP/declare_mapper_messages.cpp
+++ b/clang/test/OpenMP/declare_mapper_messages.cpp
@@ -99,6 +99,19 @@ int fun(int arg) {
 #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'}}
   }