[CUDA][OpenMP] Create generic offload toolchains

Summary:
This patch introduces the concept of offloading tool chain and offloading kind. Each tool chain may have associated an offloading kind that marks it as used in a given programming model that requires offloading. 

It also adds the logic to iterate on the tool chains based on the kind. Currently, only CUDA is supported, but in general a programming model (an offloading kind) may have associated multiple tool chains that require supporting offloading.

This patch does not add tests - its goal is to keep the existing functionality.

This patch is the first of a series of three that attempts to make the current support of CUDA more generic and easier to extend to other programming models, namely OpenMP. It tries to capture the suggestions/improvements/concerns on the initial proposal in  http://lists.llvm.org/pipermail/cfe-dev/2016-February/047547.html. It only tackles the more consensual part of the proposal, i.e.does not address the problem of intermediate files bundling yet.

Reviewers: ABataev, jlebar, echristo, hfinkel, tra

Subscribers: guansong, Hahnfeld, andreybokhanko, tcramer, mkuron, cfe-commits, arpith-jacob, carlo.bertolli, caomhin

Differential Revision: http://reviews.llvm.org/D18170

llvm-svn: 272571

1 files changed, 4 insertions, 4 deletions

diff --git a/clang/lib/Driver/Tools.cpp b/clang/lib/Driver/Tools.cpp
index 9b715e3..e73c22d 100644
--- a/clang/lib/Driver/Tools.cpp
+++ b/clang/lib/Driver/Tools.cpp
@@ -3767,10 +3767,10 @@ void Clang::ConstructJob(Compilation &C, const JobAction &JA,
     // particular compilation pass we're constructing here. For now we
     // can check which toolchain we're using and pick the other one to
     // extract the triple.
-    if (&getToolChain() == C.getCudaDeviceToolChain())
-      AuxToolChain = C.getCudaHostToolChain();
-    else if (&getToolChain() == C.getCudaHostToolChain())
-      AuxToolChain = C.getCudaDeviceToolChain();
+    if (&getToolChain() == C.getSingleOffloadToolChain<Action::OFK_Cuda>())
+      AuxToolChain = C.getOffloadingHostToolChain();
+    else if (&getToolChain() == C.getOffloadingHostToolChain())
+      AuxToolChain = C.getSingleOffloadToolChain<Action::OFK_Cuda>();
     else
       llvm_unreachable("Can't figure out CUDA compilation mode.");
     assert(AuxToolChain != nullptr && "No aux toolchain.");