[OPENMP][Analysis] Add analysis of the map clauses.

Summary:
Added basic analysis of map clauses. Only map clauses with to and tofrom
map type must be analyzed since all other map types (alloc, delete, etc.) do not require to use the value of the initial variable, instead they create the new copy of the variable.

Reviewers: NoQ

Subscribers: guansong, cfe-commits, kkwli0, caomhin

Tags: #clang

Differential Revision: https://reviews.llvm.org/D66668

llvm-svn: 370214

1 files changed, 7 insertions, 0 deletions

diff --git a/clang/test/OpenMP/target_data_messages.c b/clang/test/OpenMP/target_data_messages.c
index 9497ddba026..7dd48f7e507 100644
--- a/clang/test/OpenMP/target_data_messages.c
+++ b/clang/test/OpenMP/target_data_messages.c
@@ -4,6 +4,13 @@
 
 void foo() { }
 
+void xxx(int argc) {
+  int map; // expected-note {{initialize the variable 'map' to silence this warning}}
+#pragma omp target data map(map) // expected-warning {{variable 'map' is uninitialized when used here}}
+  for (int i = 0; i < 10; ++i)
+    ;
+}
+
 int main(int argc, char **argv) {
   int a;
   #pragma omp target data // expected-error {{expected at least one 'map' or 'use_device_ptr' clause for '#pragma omp target data'}}