[CUDA] Move CUPTI function pointers to a separate struct

Author: Pierre-Andre Saulais

source/adapters/cuda/tracing.cpp

@@ -43,8 +43,8 @@ CUptiResult (*)(uint32_t enable, CUpti_SubscriberHandle subscriber,
                 CUpti_CallbackDomain domain, CUpti_CallbackId cbid);
 
 #define LOAD_CUPTI_SYM(p, lib, x)                                              \
-  p->x = (cupti##x##_fn)ur_loader::LibLoader::getFunctionPtr(lib.get(),        \
-                                                             "cupti" #x);
+  p.x = (cupti##x##_fn)ur_loader::LibLoader::getFunctionPtr(lib.get(),         \
+                                                            "cupti" #x);
 
 #else
 using tracing_event_t = void *;
@@ -55,15 +55,21 @@ using cuptiEnableDomain_fn = void *;
 using cuptiEnableCallback_fn = void *;
 #endif // XPTI_ENABLE_INSTRUMENTATION
 
+struct cupti_table_t_ {
+  cuptiSubscribe_fn Subscribe = nullptr;
+  cuptiUnsubscribe_fn Unsubscribe = nullptr;
+  cuptiEnableDomain_fn EnableDomain = nullptr;
+  cuptiEnableCallback_fn EnableCallback = nullptr;
+
+  bool isInitialized() const;
+};
+
 struct cuda_tracing_context_t_ {
   tracing_event_t CallEvent = nullptr;
   tracing_event_t DebugEvent = nullptr;
   subscriber_handle_t Subscriber = nullptr;
   ur_loader::LibLoader::Lib Library;
-  cuptiSubscribe_fn Subscribe = nullptr;
-  cuptiUnsubscribe_fn Unsubscribe = nullptr;
-  cuptiEnableDomain_fn EnableDomain = nullptr;
-  cuptiEnableCallback_fn EnableCallback = nullptr;
+  cupti_table_t_ Cupti;
 };
 
 #ifdef XPTI_ENABLE_INSTRUMENTATION
@@ -132,6 +138,10 @@ void freeCUDATracingContext(cuda_tracing_context_t_ *Ctx) {
 #endif // XPTI_ENABLE_INSTRUMENTATION
 }
 
+bool cupti_table_t_::isInitialized() const {
+  return Subscribe && Unsubscribe && EnableDomain && EnableCallback;
+}
+
 bool loadCUDATracingLibrary(cuda_tracing_context_t_ *Ctx) {
 #if defined(XPTI_ENABLE_INSTRUMENTATION) && defined(CUPTI_LIB_PATH)
   if (!Ctx)
@@ -141,16 +151,16 @@ bool loadCUDATracingLibrary(cuda_tracing_context_t_ *Ctx) {
   auto Lib{ur_loader::LibLoader::loadAdapterLibrary(CUPTI_LIB_PATH)};
   if (!Lib)
     return false;
-  LOAD_CUPTI_SYM(Ctx, Lib, Subscribe)
-  LOAD_CUPTI_SYM(Ctx, Lib, Unsubscribe)
-  LOAD_CUPTI_SYM(Ctx, Lib, EnableDomain)
-  LOAD_CUPTI_SYM(Ctx, Lib, EnableCallback)
-  if (!Ctx->Subscribe || !Ctx->Unsubscribe || !Ctx->EnableDomain ||
-      !Ctx->EnableCallback) {
-    unloadCUDATracingLibrary(Ctx);
+  cupti_table_t_ Table;
+  LOAD_CUPTI_SYM(Table, Lib, Subscribe)
+  LOAD_CUPTI_SYM(Table, Lib, Unsubscribe)
+  LOAD_CUPTI_SYM(Table, Lib, EnableDomain)
+  LOAD_CUPTI_SYM(Table, Lib, EnableCallback)
+  if (!Table.isInitialized()) {
     return false;
   }
   Ctx->Library = std::move(Lib);
+  Ctx->Cupti = Table;
   return true;
 #else
   (void)Ctx;
@@ -160,14 +170,10 @@ bool loadCUDATracingLibrary(cuda_tracing_context_t_ *Ctx) {
 
 void unloadCUDATracingLibrary(cuda_tracing_context_t_ *Ctx) {
 #ifdef XPTI_ENABLE_INSTRUMENTATION
-  if (!Ctx || !Ctx->Library)
+  if (!Ctx)
     return;
-  Ctx->Subscribe = nullptr;
-  Ctx->Unsubscribe = nullptr;
-  Ctx->EnableDomain = nullptr;
-  Ctx->EnableCallback = nullptr;
-
   Ctx->Library.reset();
+  Ctx->Cupti = cupti_table_t_();
 #else
   (void)Ctx;
 #endif // XPTI_ENABLE_INSTRUMENTATION
@@ -207,12 +213,12 @@ void enableCUDATracing(cuda_tracing_context_t_ *Ctx) {
       xptiMakeEvent("CUDA Plugin Debug Layer", &CUDADebugPayload,
                     xpti::trace_algorithm_event, xpti_at::active, &Dummy);
 
-  Ctx->Subscribe(&Ctx->Subscriber, cuptiCallback, Ctx);
-  Ctx->EnableDomain(1, Ctx->Subscriber, CUPTI_CB_DOMAIN_DRIVER_API);
-  Ctx->EnableCallback(0, Ctx->Subscriber, CUPTI_CB_DOMAIN_DRIVER_API,
-                      CUPTI_DRIVER_TRACE_CBID_cuGetErrorString);
-  Ctx->EnableCallback(0, Ctx->Subscriber, CUPTI_CB_DOMAIN_DRIVER_API,
-                      CUPTI_DRIVER_TRACE_CBID_cuGetErrorName);
+  Ctx->Cupti.Subscribe(&Ctx->Subscriber, cuptiCallback, Ctx);
+  Ctx->Cupti.EnableDomain(1, Ctx->Subscriber, CUPTI_CB_DOMAIN_DRIVER_API);
+  Ctx->Cupti.EnableCallback(0, Ctx->Subscriber, CUPTI_CB_DOMAIN_DRIVER_API,
+                            CUPTI_DRIVER_TRACE_CBID_cuGetErrorString);
+  Ctx->Cupti.EnableCallback(0, Ctx->Subscriber, CUPTI_CB_DOMAIN_DRIVER_API,
+                            CUPTI_DRIVER_TRACE_CBID_cuGetErrorName);
 #else
   (void)Ctx;
 #endif
@@ -223,8 +229,8 @@ void disableCUDATracing(cuda_tracing_context_t_ *Ctx) {
   if (!Ctx || !xptiTraceEnabled())
     return;
 
-  if (Ctx->Subscriber) {
-    Ctx->Unsubscribe(Ctx->Subscriber);
+  if (Ctx->Subscriber && Ctx->Cupti.isInitialized()) {
+    Ctx->Cupti.Unsubscribe(Ctx->Subscriber);
     Ctx->Subscriber = nullptr;
   }