[SYCL] new tests for SYCL 2020 callable device selector interfaces (#1119)

Author: cperkinsintel

SYCL/Basic/device-selectors.cpp

@@ -0,0 +1,97 @@
+// RUN: %clangxx -fsycl -fsycl-targets=%sycl_triple %s -o %t.out
+// RUN:  %t.out
+
+#include <sycl/sycl.hpp>
+using namespace sycl;
+
+auto exception_handler_lambda = [](exception_list elist) {
+  // nop
+};
+
+void handle_exceptions_f(exception_list elist) {
+  // nop
+}
+
+auto refuse_any_device_lambda = [](const device &d) { return -1; };
+
+int refuse_any_device_f(const device &d) { return -1; }
+
+int main() {
+  // Ensure these compile correctly. That exception handler does not
+  // end up specialized against device selector.
+  queue exception_queue_01(exception_handler_lambda);
+  queue exception_queue_02(handle_exceptions_f);
+
+  // Set up callable device selector.
+  std::vector<device> deviceList = device::get_devices();
+  device &lastDevice = deviceList.back();
+  auto select_last_device = [&lastDevice](const device &d) {
+    return d == lastDevice;
+  };
+
+  // Instantiate platform via callable Device Selector.
+  platform lastPlatform(select_last_device);
+
+  // Test each of the four queue constructors that take callable Device
+  // Selectors: q(device selector) q(dev selector ,  async handler)
+  // q(context , dev selector) q(context, dev selector , async handler)
+  queue lastQueue(select_last_device);
+  assert(lastQueue.get_device().get_platform() == lastPlatform &&
+         "Queue and platform created by selecting same device, should result "
+         "in matching platforms.");
+
+  queue lastQueueWithHandler(select_last_device, exception_handler_lambda);
+  assert(lastQueueWithHandler.get_device() == lastDevice &&
+         "Queue created by selecting a device should have that same device.");
+
+  // Create a context.
+  platform plt;
+  std::vector<device> platformDevices = plt.get_devices();
+  context ctx(platformDevices);
+  // Set up a callable device selector to select the last device from the
+  // context.
+  device &lastPlatformDevice = platformDevices.back();
+  auto select_last_platform_device = [&lastPlatformDevice](const device &d) {
+    return d == lastPlatformDevice;
+  };
+  // Test queue constructors that use devices from a context.
+  queue lastQueueViaContext(ctx, select_last_platform_device);
+  assert(lastQueueViaContext.get_device() == lastPlatformDevice &&
+         "Queue created by selecting a device should have that same device.");
+
+  queue lastQueueViaContextWithHandler(ctx, select_last_platform_device,
+                                       handle_exceptions_f);
+  assert(lastQueueViaContextWithHandler.get_device() == lastPlatformDevice &&
+         "Queue created by selecting a device should have that same device.");
+
+  // Device constructor.
+  device matchingDevice(select_last_device);
+  assert(matchingDevice == lastDevice && "Incorrect selected device.");
+
+  // Check exceptions and failures.
+  try {
+    platform refusedPlatform(refuse_any_device_lambda);
+    assert(false &&
+           "Declined device selection should have resulted in an exception.");
+  } catch (sycl::exception &e) {
+    assert(e.code() == sycl::errc::runtime && "Incorrect error code.");
+  }
+
+  try {
+    queue refusedQueue(refuse_any_device_f);
+    assert(false &&
+           "Declined device selection should have resulted in an exception.");
+  } catch (sycl::exception &e) {
+    assert(e.code() == sycl::errc::runtime && "Incorrect error code.");
+  }
+
+  try {
+    device refusedDevice(refuse_any_device_f);
+    assert(false &&
+           "Declined device selection should have resulted in an exception.");
+  } catch (sycl::exception &e) {
+    assert(e.code() == sycl::errc::runtime && "Incorrect error code.");
+  }
+
+  return 0;
+}