[libc] Add a test to directly stimulate the RPC interface

Currently, the RPC interface with the loader is only tested if the other
tests fail. This test adds a direct test that runs a simple integer
increment over the RPC handshake 10000 times.

Depends on https://reviews.llvm.org/D148288

Reviewed By: lntue

Differential Revision: https://reviews.llvm.org/D148342

1 files changed, 6 insertions, 0 deletions

diff --git a/libc/utils/gpu/loader/Server.h b/libc/utils/gpu/loader/Server.h
index 12565b0489ee..af432fcfe1fb 100644
--- a/libc/utils/gpu/loader/Server.h
+++ b/libc/utils/gpu/loader/Server.h
@@ -42,6 +42,12 @@ void handle_server() {
     });
     break;
   }
+  case __llvm_libc::rpc::Opcode::TEST_INCREMENT: {
+    port->recv_and_send([](__llvm_libc::rpc::Buffer *buffer) {
+      reinterpret_cast<uint64_t *>(buffer->data)[0] += 1;
+    });
+    break;
+  }
   default:
     port->recv([](__llvm_libc::rpc::Buffer *) { /* no-op */ });
     return;