[OpenMP 5.0] Codegen support for user-defined mappers.

This patch implements the code generation for OpenMP 5.0 declare mapper
(user-defined mapper) constructs. For each declare mapper, a mapper
function is generated. These mapper functions will be called by the
runtime and/or other mapper functions to achieve user defined mapping.

The design slides can be found at
https://github.com/lingda-li/public-sharing/blob/master/mapper_runtime_design.pptx

Re-commit after revert in r367773 because r367755 changed the LLVM-IR
output such that a CHECK line failed.

Patch by Lingda Li <lildmh@gmail.com>

Differential Revision: https://reviews.llvm.org/D59474

llvm-svn: 367905

1 files changed, 3 insertions, 0 deletions

diff --git a/clang/lib/CodeGen/ModuleBuilder.cpp b/clang/lib/CodeGen/ModuleBuilder.cpp
index 3b4e060..414a6b8 100644
--- a/clang/lib/CodeGen/ModuleBuilder.cpp
+++ b/clang/lib/CodeGen/ModuleBuilder.cpp
@@ -232,6 +232,9 @@ namespace {
           if (auto *DRD = dyn_cast<OMPDeclareReductionDecl>(Member)) {
             if (Ctx->DeclMustBeEmitted(DRD))
               Builder->EmitGlobal(DRD);
+          } else if (auto *DMD = dyn_cast<OMPDeclareMapperDecl>(Member)) {
+            if (Ctx->DeclMustBeEmitted(DMD))
+              Builder->EmitGlobal(DMD);
           }
         }
       }