[SYCL] Fix minor Coverity issues with uninitialized variables (#15625)

This PR fixes Coverity hits due to potential use of uninitialized
variables.

sycl/source/detail/bindless_images.cpp

@@ -171,7 +171,7 @@ alloc_image_mem(const image_descriptor &desc, const sycl::device &syclDevice,
   ur_image_format_t urFormat;
   populate_ur_structs(desc, urDesc, urFormat);
 
-  image_mem_handle retHandle;
+  image_mem_handle retHandle = {};
 
   // Call impl.
   Adapter->call<sycl::errc::memory_allocation,
@@ -201,7 +201,7 @@ __SYCL_EXPORT image_mem_handle get_mip_level_mem_handle(
   const sycl::detail::AdapterPtr &Adapter = CtxImpl->getAdapter();
 
   // Call impl.
-  image_mem_handle individual_image;
+  image_mem_handle individual_image = {};
   Adapter->call<sycl::errc::runtime,
                 sycl::detail::UrApiKind::urBindlessImagesMipmapGetLevelExp>(
       C, Device, mipMem.raw_handle, level, &individual_image.raw_handle);
@@ -284,7 +284,7 @@ create_image(image_mem_handle memHandle, const image_descriptor &desc,
   populate_ur_structs(desc, urDesc, urFormat);
 
   // Call impl.
-  ur_exp_image_mem_native_handle_t urImageHandle;
+  ur_exp_image_mem_native_handle_t urImageHandle = 0;
   Adapter
       ->call<sycl::errc::runtime,
              sycl::detail::UrApiKind::urBindlessImagesUnsampledImageCreateExp>(
@@ -421,7 +421,7 @@ create_image(void *devPtr, size_t pitch, const bindless_image_sampler &sampler,
   populate_ur_structs(desc, urDesc, urFormat, pitch);
 
   // Call impl.
-  ur_exp_image_mem_native_handle_t urImageHandle;
+  ur_exp_image_mem_native_handle_t urImageHandle = 0;
   Adapter->call<sycl::errc::runtime,
                 sycl::detail::UrApiKind::urBindlessImagesSampledImageCreateExp>(
       C, Device, reinterpret_cast<ur_exp_image_mem_native_handle_t>(devPtr),
@@ -550,7 +550,7 @@ image_mem_handle map_external_image_memory(external_mem extMem,
 
   ur_exp_external_mem_handle_t urExternalMem{extMem.raw_handle};
 
-  image_mem_handle retHandle;
+  image_mem_handle retHandle = {};
   Adapter->call<sycl::errc::invalid,
                 sycl::detail::UrApiKind::urBindlessImagesMapExternalArrayExp>(
       C, Device, &urFormat, &urDesc, urExternalMem, &retHandle.raw_handle);
@@ -580,7 +580,7 @@ void *map_external_linear_memory(external_mem extMem, uint64_t offset,
 
   ur_exp_external_mem_handle_t urExternalMem{extMem.raw_handle};
 
-  void *retMemory;
+  void *retMemory = nullptr;
   Adapter->call<
       sycl::errc::invalid,
       sycl::detail::UrApiKind::urBindlessImagesMapExternalLinearMemoryExp>(
@@ -631,7 +631,7 @@ __SYCL_EXPORT external_semaphore import_external_semaphore(
       sycl::detail::getSyclObjImpl(syclDevice);
   ur_device_handle_t Device = DevImpl->getHandleRef();
 
-  ur_exp_external_semaphore_handle_t urExternalSemaphore;
+  ur_exp_external_semaphore_handle_t urExternalSemaphore = nullptr;
   ur_exp_file_descriptor_t urFileDescriptor = {};
   urFileDescriptor.stype = UR_STRUCTURE_TYPE_EXP_FILE_DESCRIPTOR;
   urFileDescriptor.fd = externalSemaphoreDesc.external_resource.file_descriptor;
@@ -778,7 +778,7 @@ get_image_channel_type(const image_mem_handle memHandle,
       sycl::detail::getSyclObjImpl(syclContext);
   const sycl::detail::AdapterPtr &Adapter = CtxImpl->getAdapter();
 
-  ur_image_format_t URFormat;
+  ur_image_format_t URFormat = {};
 
   Adapter->call<sycl::errc::invalid,
                 sycl::detail::UrApiKind::urBindlessImagesImageGetInfoExp>(

sycl/source/device.cpp

@@ -234,8 +234,8 @@ bool device::ext_oneapi_can_access_peer(const device &peer,
     return true;
   }
 
-  size_t returnSize;
-  int value;
+  size_t returnSize = 0;
+  int value = 0;
 
   ur_exp_peer_info_t UrAttr = [&]() {
     switch (attr) {

sycl/source/handler.cpp

@@ -1862,7 +1862,12 @@ handler::getCommandGraph() const {
   if (impl->MGraph) {
     return impl->MGraph;
   }
-  return MQueue->getCommandGraph();
+
+  if (this->MQueue)
+    return MQueue->getCommandGraph();
+  // We should never reach here. MGraph and MQueue can not be null
+  // simultaneously.
+  return nullptr;
 }
 
 void handler::setUserFacingNodeType(ext::oneapi::experimental::node_type Type) {

sycl/source/virtual_mem.cpp

@@ -47,7 +47,7 @@ __SYCL_EXPORT size_t get_mem_granularity(const device &SyclDevice,
       sycl::detail::getSyclObjImpl(SyclContext);
   const sycl::detail::AdapterPtr &Adapter = ContextImpl->getAdapter();
 #ifndef NDEBUG
-  size_t InfoOutputSize;
+  size_t InfoOutputSize = 0;
   Adapter->call<sycl::detail::UrApiKind::urVirtualMemGranularityGetInfo>(
       ContextImpl->getHandleRef(), DeviceImpl->getHandleRef(), GranularityQuery,
       0, nullptr, &InfoOutputSize);

xpti/include/xpti/xpti_data_types.h

@@ -436,7 +436,7 @@ struct payload_t {
   /// Kernel/lambda/function address
   const void *code_ptr_va = nullptr;
   /// Internal bookkeeping slot - do not change.
-  uint64_t internal;
+  uint64_t internal = 0;
   /// Flags indicating whether string name, codepointer, source file and hash
   /// values are available
   uint64_t flags = 0;