Use nullptr default initialization

Don't need extra flag for IsInitialized if checking if cudaGraphExec is
no longer its initial value of nullptr.

Author: hdelan

source/adapters/cuda/command_buffer.cpp

@@ -401,7 +401,8 @@ urCommandBufferReleaseExp(ur_exp_command_buffer_handle_t hCommandBuffer) {
 
 UR_APIEXPORT ur_result_t UR_APICALL
 urCommandBufferFinalizeExp(ur_exp_command_buffer_handle_t hCommandBuffer) {
-  UR_ASSERT(!hCommandBuffer->IsFinalized, UR_RESULT_ERROR_INVALID_OPERATION);
+  UR_ASSERT(hCommandBuffer->CudaGraphExec == nullptr,
+            UR_RESULT_ERROR_INVALID_OPERATION);
   try {
     const unsigned long long flags = 0;
 #if CUDA_VERSION >= 12000
@@ -419,7 +420,6 @@ urCommandBufferFinalizeExp(ur_exp_command_buffer_handle_t hCommandBuffer) {
   } catch (...) {
     return UR_RESULT_ERROR_UNKNOWN;
   }
-  hCommandBuffer->IsFinalized = true;
   return UR_RESULT_SUCCESS;
 }
 

source/adapters/cuda/command_buffer.hpp

@@ -352,12 +352,10 @@ struct ur_exp_command_buffer_handle_t_ {
   ur_device_handle_t Device;
   // Whether commands in the command-buffer can be updated
   bool IsUpdatable;
-  // Keep track of whether command buffer is finalized
-  bool IsFinalized = false;
   // Cuda Graph handle
   CUgraph CudaGraph;
   // Cuda Graph Exec handle
-  CUgraphExec CudaGraphExec;
+  CUgraphExec CudaGraphExec = nullptr;
   // Atomic variable counting the number of reference to this command_buffer
   // using std::atomic prevents data race when incrementing/decrementing.
   std::atomic_uint32_t RefCountInternal;

source/adapters/hip/command_buffer.cpp

@@ -306,15 +306,15 @@ urCommandBufferReleaseExp(ur_exp_command_buffer_handle_t hCommandBuffer) {
 
 UR_APIEXPORT ur_result_t UR_APICALL
 urCommandBufferFinalizeExp(ur_exp_command_buffer_handle_t hCommandBuffer) {
-  UR_ASSERT(!hCommandBuffer->IsFinalized, UR_RESULT_ERROR_INVALID_OPERATION);
+  UR_ASSERT(hCommandBuffer->HIPGraphExec == nullptr,
+            UR_RESULT_ERROR_INVALID_OPERATION);
   try {
     const unsigned long long flags = 0;
     UR_CHECK_ERROR(hipGraphInstantiateWithFlags(
         &hCommandBuffer->HIPGraphExec, hCommandBuffer->HIPGraph, flags));
   } catch (...) {
     return UR_RESULT_ERROR_UNKNOWN;
   }
-  hCommandBuffer->IsFinalized = true;
   return UR_RESULT_SUCCESS;
 }
 

source/adapters/hip/command_buffer.hpp

@@ -172,12 +172,10 @@ struct ur_exp_command_buffer_handle_t_ {
   ur_device_handle_t Device;
   // Whether commands in the command-buffer can be updated
   bool IsUpdatable;
-  // Keep track of whether command buffer is finalized
-  bool IsFinalized = false;
   // HIP Graph handle
   hipGraph_t HIPGraph;
   // HIP Graph Exec handle
-  hipGraphExec_t HIPGraphExec;
+  hipGraphExec_t HIPGraphExec = nullptr;
   // Atomic variable counting the number of reference to this command_buffer
   // using std::atomic prevents data race when incrementing/decrementing.
   std::atomic_uint32_t RefCountInternal;