From aa5a863dae85b25b5e100dfe0dee43f7461a635b Mon Sep 17 00:00:00 2001
From: Wenju He <wenju.he@intel.com>
Date: Sat, 18 Jul 2026 10:12:26 +0200
Subject: [PATCH] [SYCL][Unit] Mock UR_DEVICE_INFO_PLATFORM in UrMock

Fixes `SYCL_UR_TRACE=1 ninja check-sycl-unittests` crash in #22683.

mock_urDeviceGetInfo() fell through to the default zero-fill case for
UR_DEVICE_INFO_PLATFORM, so device::get_info<info::device::platform>()
returned a platform wrapping a null UR handle. This is latent unless
something queries that platform afterwards, which
detail::traceDeviceSelection() does whenever SYCL_UR_TRACE is enabled,
causing urPlatformGetInfo to fail with UR_RESULT_ERROR_INVALID_NULL_HANDLE
and the process to abort on the uncaught exception.

Co-authored-by: Claude Sonnet 5 <noreply@anthropic.com>
---
 sycl/unittests/helpers/UrMock.hpp | 8 ++++++++
 1 file changed, 8 insertions(+)

diff --git a/sycl/unittests/helpers/UrMock.hpp b/sycl/unittests/helpers/UrMock.hpp
index 7179ac5b65548..c5b3dd47515d4 100644
--- a/sycl/unittests/helpers/UrMock.hpp
+++ b/sycl/unittests/helpers/UrMock.hpp
@@ -177,6 +177,14 @@ inline ur_result_t mock_urDeviceGetInfo(void *pParams) {
       **params->ppPropSizeRet = sizeof(MockDeviceName);
     return UR_RESULT_SUCCESS;
   }
+  case UR_DEVICE_INFO_PLATFORM: {
+    if (*params->ppPropValue)
+      *static_cast<ur_platform_handle_t *>(*params->ppPropValue) =
+          reinterpret_cast<ur_platform_handle_t>(1);
+    if (*params->ppPropSizeRet)
+      **params->ppPropSizeRet = sizeof(ur_platform_handle_t);
+    return UR_RESULT_SUCCESS;
+  }
   case UR_DEVICE_INFO_PARENT_DEVICE: {
     if (*params->ppPropValue)
       *static_cast<ur_device_handle_t *>(*params->ppPropValue) = nullptr;