Wrap urEventSetCallback when ran through loader

The events returned by the loader do not match the events returned by
openCL (or other backends), which causes issues when adding a callback
handler. This adds an intermediate wrapper to replace the event with the
loader event.

Author: RossBrunton

scripts/templates/ldrddi.cpp.mako

@@ -24,13 +24,37 @@ from templates import helper as th
 namespace ur_loader
 {
     %for obj in th.get_adapter_functions(specs):
+    <%
+        func_name = th.make_func_name(n, tags, obj)
+        if func_name.startswith(x):
+            func_basename = func_name[len(x):]
+        else:
+            func_basename = func_name
+    %>
+    %if func_basename == "EventSetCallback":
+    namespace {
+    struct event_callback_wrapper_data_t {
+        ${x}_event_callback_t fn;
+        ${x}_event_handle_t event;
+        void *userData;
+    };
+
+    void event_callback_wrapper([[maybe_unused]] ${x}_event_handle_t hEvent,
+                                ${x}_execution_info_t execStatus, void *pUserData) {
+        auto *wrapper =
+            reinterpret_cast<event_callback_wrapper_data_t *>(pUserData);
+        (wrapper->fn)(wrapper->event, execStatus, wrapper->userData);
+        delete wrapper;
+    }
+    }
+
+    %endif
     ///////////////////////////////////////////////////////////////////////////////
-    /// @brief Intercept function for ${th.make_func_name(n, tags, obj)}
+    /// @brief Intercept function for ${func_name}
     %if 'condition' in obj:
     #if ${th.subt(n, tags, obj['condition'])}
     %endif
-    __${x}dlllocal ${x}_result_t ${X}_APICALL
-    ${th.make_func_name(n, tags, obj)}(
+    __${x}dlllocal ${x}_result_t ${X}_APICALL ${func_name}(
         %for line in th.make_param_lines(n, tags, obj):
         ${line}
         %endfor
@@ -41,7 +65,16 @@ namespace ur_loader
     %>${th.get_initial_null_set(obj)}
 
         [[maybe_unused]] auto context = getContext();
-        %if re.match(r"\w+AdapterGet$", th.make_func_name(n, tags, obj)):
+        %if func_basename == "EventSetCallback":
+
+        // Replace the callback with a wrapper function that gives the callback the loader event rather than a
+        // backend-specific event
+        auto wrapper_data =
+            new event_callback_wrapper_data_t{pfnNotify, hEvent, pUserData};
+        pUserData = wrapper_data;
+        pfnNotify = event_callback_wrapper;
+        %endif
+        %if func_basename == "AdapterGet":
 
         size_t adapterIndex = 0;
         if( nullptr != ${obj['params'][1]['name']} && ${obj['params'][0]['name']} !=0)
@@ -74,7 +107,7 @@ namespace ur_loader
             *${obj['params'][2]['name']} = static_cast<uint32_t>(context->platforms.size());
         }
 
-        %elif re.match(r"\w+PlatformGet$", th.make_func_name(n, tags, obj)):
+        %elif func_basename == "PlatformGet":
         uint32_t total_platform_handle_count = 0;
 
         for( uint32_t adapter_index = 0; adapter_index < ${obj['params'][1]['name']}; adapter_index++)
@@ -263,7 +296,7 @@ namespace ur_loader
         %for i, item in enumerate(epilogue):
         %if 0 == i and not item['release'] and not item['retain'] and not th.always_wrap_outputs(obj):
         ## TODO: Remove once we have a concrete way for submitting warnings in place.
-        %if re.match(r"urEnqueue\w+", th.make_func_name(n, tags, obj)):
+        %if re.match(r"Enqueue\w+", func_basename):
         // In the event of ERROR_ADAPTER_SPECIFIC we should still attempt to wrap any output handles below.
         if( ${X}_RESULT_SUCCESS != result && ${X}_RESULT_ERROR_ADAPTER_SPECIFIC != result )
             return result;
@@ -278,7 +311,7 @@ namespace ur_loader
         ##%if item['release']:
         ##// release loader handle
         ##${item['factory']}.release( ${item['name']} );
-        %if not item['release'] and not item['retain'] and not '_native_object_' in item['obj'] or th.make_func_name(n, tags, obj) == 'urPlatformCreateWithNativeHandle':
+        %if not item['release'] and not item['retain'] and not '_native_object_' in item['obj'] or func_name == 'urPlatformCreateWithNativeHandle':
         try
         {
             %if 'typename' in item:

source/loader/ur_ldrddi.cpp

@@ -13,6 +13,7 @@
 #include "ur_loader.hpp"
 
 namespace ur_loader {
+
 ///////////////////////////////////////////////////////////////////////////////
 /// @brief Intercept function for urAdapterGet
 __urdlllocal ur_result_t UR_APICALL urAdapterGet(
@@ -4410,6 +4411,22 @@ __urdlllocal ur_result_t UR_APICALL urEventCreateWithNativeHandle(
     return result;
 }
 
+namespace {
+struct event_callback_wrapper_data_t {
+    ur_event_callback_t fn;
+    ur_event_handle_t event;
+    void *userData;
+};
+
+void event_callback_wrapper([[maybe_unused]] ur_event_handle_t hEvent,
+                            ur_execution_info_t execStatus, void *pUserData) {
+    auto *wrapper =
+        reinterpret_cast<event_callback_wrapper_data_t *>(pUserData);
+    (wrapper->fn)(wrapper->event, execStatus, wrapper->userData);
+    delete wrapper;
+}
+} // namespace
+
 ///////////////////////////////////////////////////////////////////////////////
 /// @brief Intercept function for urEventSetCallback
 __urdlllocal ur_result_t UR_APICALL urEventSetCallback(
@@ -4423,6 +4440,13 @@ __urdlllocal ur_result_t UR_APICALL urEventSetCallback(
 
     [[maybe_unused]] auto context = getContext();
 
+    // Replace the callback with a wrapper function that gives the callback the loader event rather than a
+    // backend-specific event
+    auto wrapper_data =
+        new event_callback_wrapper_data_t{pfnNotify, hEvent, pUserData};
+    pUserData = wrapper_data;
+    pfnNotify = event_callback_wrapper;
+
     // extract platform's function pointer table
     auto dditable = reinterpret_cast<ur_event_object_t *>(hEvent)->dditable;
     auto pfnSetCallback = dditable->ur.Event.pfnSetCallback;